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WO2018174661A1 - Procédé de sélection de ressource dans une communication de véhicule à tout et appareil associé - Google Patents

Procédé de sélection de ressource dans une communication de véhicule à tout et appareil associé Download PDF

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Publication number
WO2018174661A1
WO2018174661A1 PCT/KR2018/003478 KR2018003478W WO2018174661A1 WO 2018174661 A1 WO2018174661 A1 WO 2018174661A1 KR 2018003478 W KR2018003478 W KR 2018003478W WO 2018174661 A1 WO2018174661 A1 WO 2018174661A1
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WO
WIPO (PCT)
Prior art keywords
subframe
resource
carrier
resources
pssch
Prior art date
Application number
PCT/KR2018/003478
Other languages
English (en)
Inventor
Shichang Zhang
Yingyang Li
Yi Wang
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201710486403.5A external-priority patent/CN109121209B/zh
Priority claimed from CN201711160446.0A external-priority patent/CN109121214B/zh
Priority claimed from CN201810036887.8A external-priority patent/CN108632781B/zh
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to US16/490,408 priority Critical patent/US11102631B2/en
Priority to EP18772610.4A priority patent/EP3574694A4/fr
Publication of WO2018174661A1 publication Critical patent/WO2018174661A1/fr
Priority to US17/444,458 priority patent/US11659371B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/005—Moving wireless networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present disclosure generally relates to communication technology, and more particular, to a resource selection or reselection method and a user equipment (UE) performing the same in vehicle to every (V2X) communication, and to a resource allocation method and apparatus in sidelink communications with low delay and high reliability.
  • UE user equipment
  • a device-to-device direct communication link is referred to as a sidelink. Similar to uplink and downlink, there is also control channel and data channel in sidelink, and the former is referred to as Physical Sidelink Control CHannel (PSCCH), and the latter is referred to as Physical Sidelink Shared CHannel (PSSCH).
  • PSCCH Physical Sidelink Control CHannel
  • PSSCH Physical Sidelink Shared CHannel
  • the PSCCH is used to indicate time/frequency domain resource positions, modulation and coding mode, and priorities of data carried in PSSCH of PSSCH transmission, while PSSCH is used to carry data.
  • Control information and data in Vehicle to Vehicle/Pedestrian/Infrastructure/Network or Vehicle to Everything can be transmitted via sidelink, and at this time, the V2X communication comprises two transmission modes, i.e. transmission mode 3 (Mode 3) and transmission mode 4 (Mode 4).
  • transmission mode 3 transmission mode 3
  • Mode 4 transmission mode 4
  • transmission resource of PSCCH and PSSCH of one UE is both allocated by an evolved Node B (eNB), and the UE determines transmission resource of the PSCCH and the PSSCH by receiving a sidelink resource allocation indication transmitted by the eNB via a physical downlink control channel (PDCCH) or an Enhanced PDCCH (EPDCCH).
  • PDCH physical downlink control channel
  • EPDCCH Enhanced PDCCH
  • the transmission resource of the PSCCH and the PSSCH are selected autonomously by the UE according to channel detection results.
  • the UE first determines time frequency resource position and priorities of scheduled PSSCH by receiving PSCCHs transmitted by other UEs, and then further detects demodulation-reference signal received power of scheduled PSSCH (PSSCH-RSRP), and excludes the resource with PSSCH-RSRP higher than a particular threshold; and the UE then calculates average received energy (S-RSSI) of the remaining resource, and at last randomly selects one resource from those with the lowest S-RSSI as transmission resource.
  • PSSCH-RSRP demodulation-reference signal received power of scheduled PSSCH
  • S-RSSI average received energy
  • Mode 3 resource pool and Mode 4 resource pool should be mutually orthogonal.
  • the resource pool is semi-statically configured, while number of UEs using a certain resource pool is dynamically changed, if resource in the resource pool and number of UEs which use the resource pool are inharmonious, then resource waste or deficiency in the resource pool may be caused. Therefore, configuring a plurality of resource pools is not beneficial to improving the utilization efficiency of time frequency resource, and at the same time may also negatively impact the performance of a V2X system.
  • the transmission resources for the PSCCH and PSSCH of one UE are both allocated by an eNodeB (shortened as eNB in the following).
  • the UE may determine the transmission resources of the PSCCH and the PSSCH through receiving the sidelink resource allocation indication transmitted by the eNB via the PDCCH or EPDCCH.
  • the transmission resources of the PSCCH and PSSCH may be selected by the UE according to a channel detection result.
  • the UE firstly determines the time-frequency resource positions and priority of a scheduled PSSCH of another UE through receiving the PSCCH transmitted by the another UE. Then, the UE detects a reference signal receiving power of the scheduled PSSCH (PSSCH-RSRP), and excludes the resources whose PSSCH-RSRP is higher than a predefined threshold (referred to as resource selection step 2 in the following). Further, the UE calculates an average Sidelink-Receiving Signal Strength Indicator (S-RSSI) of the remaining resources, the X% single-subframe resources with the lowest S-RSSI are determined as the available candidate single-subframe resources (hereinafter referred to as resource selection step 3).
  • S-RSSI Sidelink-Receiving Signal Strength Indicator
  • the value of X is 20. It should be noted that, the X% refers to the proportion of the available candidate single-subframe resources to all single-subframe resources in the resource selection window. The UE may randomly select one of the available candidate single-subframe resources as the transmission resource.
  • the data transmitted by one UE is meaningful for merely receiving UEs within a certain range.
  • the range is related to the moving speed of the transmitting UE and the receiving UE, as well as service type of the transmitted data.
  • data reliability data successful receiving rate within the valid distance
  • This reliability is able to meet requirement of basic security services.
  • 3GPP such as platooning, advance driving and extended sensor
  • there is a higher requirement for the data receiving reliability For example, in the platooning scenario, the highest reliability is required to reach 99.99%, and in the extended sensor scenario, the highest reliability is required to reach 99.999%.
  • a more rigid requirement is also proposed to the data transmission delay, the lowest delay is required to be 10ms and 3ms, but the current V2X communication mechanism can merely ensure a delay of 20ms.
  • the resource selection and resource reselection manner of the UE are merely applicable for the single-carrier working manner.
  • the resource selection and resource reselection manner of the UE are merely applicable for the single-carrier working manner.
  • multiple carriers may belong to the same frequency band.
  • the multiple carriers in the same frequency band may have In-Band Emission (IBE) interference and half-duplex restriction.
  • IBE In-Band Emission
  • the UE may perform transmission or receiving operations on multiple carriers of the same frequency band using one transmission or receiving radio link, which may lead to that the number of transmission or receiving radio chains of the UE is smaller than the number of carriers supported by the UE. Since the UE may select resources or transmit data simultaneously on multiple carriers, when the UE performs the resource selection or resource reselection, the channel status of multiple carriers may impact each other. It can be seen that, in the multi-carrier sidelink communication, when the UE performs resource selection or reselection, channel status on multiple carriers needs to be considered in combination. The resource selection and reselection manner designed for the single carrier environment in 3GPP Rel-14 is not applicable.
  • the present disclosure is designed to address at least the problems and/or disadvantages described above and to provide at least the advantages described below.
  • a resource selection or reselection method performed by a user equipment (UE) in vehicle to vehicle/pedestrian/infrastructure/network or Vehicle to Everything (V2X) communication comprises the steps of: detecting physical sidelink control channel (PSCCH) transmitted by other UE(s); selecting single-subframe resources from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH; and transmitting physical sidelink shared channel (PSSCH) on the selected single-subframe resources.
  • PSCCH physical sidelink control channel
  • PSSCH physical sidelink shared channel
  • a user equipment for performing a resource selection or reselection method in vehicle to vehicle/pedestrian/infrastructure/network or Vehicle to Everything (V2X) communication
  • a detection module for detecting physical sidelink control channel (PSCCH) transmitted by other UE(s);
  • a resource selection or reselection module configured to select a single-subframe resource from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH; and a transmitting module, which transmits physical sidelink shared channel (PSSCH) on the selected single-subframe resource.
  • PSSCH physical sidelink shared channel
  • interference on single-subframe resources scheduled or reserved by PSCCH resources can be better avoided, and the utilization efficiency of time frequency resources can be increased, and the V2X system performance can be improved.
  • embodiments of the present disclosure provide a new resource allocation method, so as to effectively improve data transmission reliability under the premise of ensuring the data transmission delay.
  • a resource allocation method in sidelink communications includes:
  • UE User Equipment
  • SLG SideLink Grant
  • the first UE transmitting a PSSCH according to the determined SLG.
  • the first UE determining the SLG includes:
  • the first UE determining the SLG according to one or more downlink control signaling transmitted by a base station;
  • the first UE determining the SLG through performing a detection in a channel detection window.
  • the one downlink control signaling when the first UE determines the SLG according to one downlink control signaling transmitted by the base station, includes: positions of slots where the PSSCH transmission resources for the second time to the M-th time transmission are located, frequency-domain positions of the PSSCH transmission resources for each time of transmission, and the number of frequency-domain resources contained in the PSSCH transmission resources for each time of transmission; wherein the slot denotes a minimum resource unit for the first UE to transmit the PSSCH.
  • the determining the SLG includes: taking a slot which is after slot n1+k and belongs to a current resource pool of the first UE as the slot where the PSSCH transmission resource for the first time transmission in the SLG is located; wherein n1 denotes an index of a slot in which the downlink control signaling is received, k is a positive integer.
  • the first UE determines the configuration of the current resource pool according to the signaling transmitted by the base station.
  • the determining the SLG comprises: for each downlink control signaling, taking slot n2+k as the slot where the first PSSCH transmission resource indicated by this downlink control signaling is located; wherein n2 denotes an index of a slot in which this downlink control signaling is received, k is a positive integer.
  • each downlink control signaling includes an index of the downlink control signaling
  • the determining the SLG includes: forming the SLG by the PSSCH time-frequency resources indicated by continuous M/N downlink control signaling indexed from 0 to M/N-1.
  • the first UE determining the SLG comprises: the first UE determining a resource pattern of the SLG according to the downlink control signaling transmitted by the base station; or, the first UE determining a resource pattern of the SLG according to the detection performed in the channel detection window;
  • the resource pattern includes M PSSCH transmission resource units in a predefined resource pattern space, and is used for indicating the position information of the PSSCH time-frequency resources for the M times transmission of the TB; a first PSSCH transmission resource unit and a last PSSCH transmission resource unit contained in each resource pattern have a time-domain gap less than or equal to a sum of a maximum tolerated delay for data transmission of the first UE and the time required for encoding the PSSCH.
  • the downlink control signaling when the first UE determining the resource pattern according to the downlink control signaling transmitted by the base station, includes an index r of the resource pattern of the SLG, wherein the index of the resource pattern denotes unique index information of each resource pattern in the resource pattern space.
  • the determining the resource pattern of the SLG includes: the first UE determining the first resource pattern with index of r after slot n3+k as the resource pattern of the SLG, and determining the resource pattern as allocated resources of the SLG; wherein n3 denotes an index of a slot in which the downlink control signaling is received, k is a positive integer.
  • the first UE determining the SLG according to the detection performed in the channel detection window includes:
  • the first UE detecting slots in the channel detection window before slot n4, wherein for each detected slot, decoding the PSCCH in the slot, and determining the number of successfully decoded PSCCH in the slot, and measuring, according to the successfully decoded PSCCH, a reference signal receiving power and a receiving energy of the PSSCH scheduled by the PSCCH, a priority of the data transmitted by the PSSCH, and a reservation interval for the PSSCH transmission resource, the first UE measuring an average receiving energy of each Resource Block Group (RBG) or each Resource Block (RB) in the slot;
  • RBG Resource Block Group
  • RB Resource Block
  • the first UE estimating, according to a measurement result in the channel detection window, the number of second UEs which may transmit PSCCH in each candidate slot in the resource selection window, a PSSCH reference signal receiving power on each candidate single-slot resource, and the average receiving energy of each RBG or RB in the resource selection window;
  • the first UE selecting, in all candidate single-slot resources in the resource selection window, M single-slot resources on which number of resources occupied by the second UE is lower than a predefined condition, and determining the selected M single-slot resources as the M PSSCH transmission resources of the SLG; the M single-slot resources are located in different slots;
  • n4 denotes a slot in which the SLG determining operation is performed, the resource selection window is , T 1 and T 2 are predefined positive integers; if the RBG is configured and the RBG is a resource allocation unit, and all PRBs in each RBG can be allocated, determining L RBG RBGs in any slot belonging to the current resource pool of the first UE and within the resource selection window as a candidate single-slot resource; if the RBG is configured and the RBG is a resource allocation unit, but only one PRB with the same index in respective RBG can be allocated, determining the i-th PRB in RBGs in any slot which is belonging to the current resource pool of the first UE and within the resource selection window as a candidate single-slot resource; if the RBG is not configured, determining L RB PRBs in any slot which is belonging to the current resource pool of the first UE and within the resource selection window as a candidate single-slot resource; L RBG , , and L RB are positive integers;
  • the selecting the M single-slot resources includes:
  • the first UE selecting, according to the estimated result, X% slots with minimum number of successfully decoded PSCCH in the resource selection window as candidate slots;
  • the first UE excluding single-slot resources with PSSCH reference signal power higher than a specified threshold from the single-slot resources of the candidate slots according to the PSSCH reference signal receiving power and the priority of the data transmitted by the PSSCH, the specified threshold is determined according to the priority of the data transmitted by the PSSCH and the priority of the data to be transmitted by the first UE;
  • X and Y are predefined positive values.
  • the PSCCH transmitted by the first UE indicates only the time-frequency resource position of the currently scheduled PSSCH, or indicate the position of the currently scheduled PSSCH and the next PSSCH transmission, or indicate the position of M PSSCH transmission resources for transmitting one TB at the same time.
  • the first UE determining the resource pattern of the SLG according to the detection performed in channel detection window includes:
  • the first UE detecting slots in the channel detection window before slot n4; wherein for each detected slot, the first UE decoding a PSCCH in the slot, measuring average reference signal receiving power of multiple PSSCHs on the resource pattern, priority of data transmitted by the PSSCHs and a resource pattern reservation interval according to the decoded PSCCH, the first UE measuring an average receiving energy of each resource pattern in the channel detection window;
  • the first UE estimating, according to the measurement result in the channel detection window, PSSCH reference signal receiving power and average receiving energy of each candidate resource pattern in the resource selection window;
  • the first UE selecting one resource pattern from all candidate resource patterns in the resource selection window as the resource pattern of the SLG;
  • n4 denotes a slot in which the SLG determining operation is performed, any resource pattern whose beginning subframe and ending subframe are both within the resource selection window is taken as the candidate resource pattern.
  • the selecting one resource pattern includes:
  • the first UE excluding resource patterns whose PSSCH reference signal average receiving power is higher than a second specified threshold from the candidate resource patterns of the resource selection window, the second specified threshold is determined according to the priority of the data transmitted by the PSSCH and the priority of the data to be transmitted by the first UE;
  • Y is a predefined positive integer
  • the PSCCH transmitted by the first UE is used for indicating an index of the transmission resource pattern of the PSSCH scheduled by the PSCCH.
  • the method further comprises: the first UE determining an occupation manner of the SLG;
  • the transmitting the PSSCH according to the determined SLG comprises: the first UE transmitting the PSSCH according to the SLG based on the determined occupation manner.
  • the occupation manner includes: occupying the SLG semi-persistently according to a predefined time interval; or occupying the SLG for one time.
  • the determining the occupation manner of the SLG includes:
  • the first UE determines the SLG according to one or more downlink control signaling transmitted by the base station, the first UE determining the occupation manner of the SLG according to the downlink control signaling;
  • the first UE determines the SLG according to the detection performed in the channel detection window, the first UE determining the occupation manner of the SLG according to a decision of a higher layer of the first UE.
  • the SLG when the first UE occupies the SLG semi-persistently according to a predefined period, the SLG further includes a period length of the semi-persistent occupation; and/or
  • the one or more downlink control signaling include position of transmission resources of the PSCCH.
  • the first UE when determining the SLG through channel detection, the first UE selects one PSCCH transmission resource according to a channel detection result.
  • the method further includes:
  • the first UE determining a modulation and coding scheme for transmitting the TB.
  • a resource allocation apparatus for sidelink communications includes: a determining unit and a transmitting unit;
  • the determining unit is to determine a SideLink Grant (SLG); wherein the SLG includes position information of M Physical Sidelink Shared Channel (PSSCH) transmission resources, the M PSSCH transmission resources are used for M times of transmission of one Transmission Block (TB), M is a positive integer;
  • SLG SideLink Grant
  • the transmitting unit is to transmit a PSSCH according to the determined SLG.
  • the first UE is able to determine the SLG through receiving downlink control signaling of the base station or through channel detection, the SLG may include multiple PSSCH transmission resources for transmitting one TB, or include a resource pattern corresponding multiple PSSCH transmission resources used for transmitting one TB. Then, the first UE transmits PSSCH according to the SLG.
  • the method provided by the present disclosure half-duplex impact between different UEs can be effectively decreased under the premise of ensuring the data transmission delay, thus the data successful receiving rate is increased.
  • Embodiments of the present disclosure further provide a resource selection or reselection method and apparatus in V2X communications, so as to overcome half-duplex restriction in the multi-carrier sidelink communication and reduce IBE interferences between multiple carriers.
  • Some embodiments of the present disclosure provide a resource selection or reselection method in V2X communication, including:
  • UE User Equipment
  • the UE determining a candidate single-subframe resource set S in the carrier set C;
  • the UE selecting at least one single-subframe resource from the set S, and transmitting a sidelink data channel on the selected resource.
  • the carrier set C includes at least one carrier
  • the configuration of Sidelink Synchronization Signal (SLSS) transmission subframes on the at least two carriers are the same;
  • the carrier set C includes at least two carriers, the configuration of the SLSS transmission subframes on the at least two carriers are different, and if subframe x is one of the SLSS transmission subframes on any of the at least two carriers, subframe x on each of the at least two carriers is not used for configuring a resource pool;
  • the carrier set C includes at least two carriers, for each of some or all of the at least two carriers, the SLSS transmission subframes and resource pool are configured independently.
  • the determining the candidate single-subframe resource set S in the carrier set C includes:
  • y denotes a relative index of subframe in the resource pool
  • a total number of single-subframe resources on carrier c is denoted by the candidate single-subframe resources constitute a set S c , a union of single-carrier single-subframe resource sets of carriers in the carrier set C is the candidate single-subframe resource set S, wherein the single-carrier single-subframe resource is a single-subframe resource of which all subchannels are located on the same carrier.
  • the UE selecting the at least one single-subframe resource in the set S via any one of:
  • the UE selecting one single-carrier single-subframe resource for data transmission in the set S wherein the UE randomly selecting one single-carrier single-subframe resource with equal probability from the set S; or, the UE randomly selecting a carrier c with equal probability from all carriers in the carrier set C, and randomly selecting one single-carrier single-subframe resource with equal probability from the set S c ;
  • the UE selecting at least two single-carrier single-subframe resources for data transmission in the set S, wherein the UE randomly selecting multiple carriers or selecting all carriers with equal probability in the carrier set C, and randomly selecting one single-carrier single-subframe resource with equal probability from the single-carrier single-subframe resources of each selected carrier;
  • the UE selecting at least two single-carrier single-subframe resources for data transmission in the set S wherein the UE sorting the carriers in the carrier set C according to their priorities or Channel Busy Ratio (CBR), the order of the carriers is denoted by carrier 0 > carrier 1 >...> carrier N1-1
  • the subframe where the selected single-carrier single-subframe resource is located is denoted by t0
  • subframe t0 contains single-carrier single-subframe resource on carrier 1
  • the subframe t0 does not contain single-carrier single-subframe resource on carrier 1
  • the UE selecting multiple single-carrier single-subframe resources for data transmission in the set S, wherein the UE selecting at most one single-carrier single-subframe resource on each carrier, and indexes of subframes where the single-carrier single-subframe resources selected by the UE are located have a minimum variance, if there are multiple selections with the minimum variance, the UE randomly selecting one of the selections;
  • the method before the UE selecting the at least one single-subframe resource in the set S, the method further includes: the UE excluding one or more candidate single-subframe resources from the set S according to a Physical Sidelink Control Channel (PSCCH) detected in a channel detecting window and an average Sidelink-Receiving Signal Strength Indicator (S-RSSI) measured in the channel detecting window;
  • PSCCH Physical Sidelink Control Channel
  • S-RSSI Sidelink-Receiving Signal Strength Indicator
  • the process of the UE selecting at least one single-subframe resource in the set S comprises: the UE selecting at least one single-subframe resource from remaining single-subframe resources in the set S.
  • the process of the UE excluding one or more candidate single-subframe resources from the set S according to a Physical Sidelink Control Channel (PSCCH) detected in the channel detecting window and the S-RSSI measured in the channel detecting window includes:
  • the PSCCH reserves the same frequency resource in subframe ,and a PSSCH-Reference Signal Received Power (RSRP) measured on a PSSCH scheduled by the PSCCH is higher than a threshold , wherein denotes a value of a priority field in a subsequently transmitted PSCCH indicated by a higher layer of the UE, denotes a threshold for the PSSCH-RSRP when the value of the priority field of the subsequently transmitted PSCCH indicated by the higher layer of the UE is , whereas the measured priority of the PSCCH is ; then:
  • C resel denotes the number of times that the resource is to be reserved after resource reselection of the UE, denotes an assumed resource reservation period for determining the available candidate single-subframe resource indicated by higher layer of the UE, the UE deleting the single-subframe resource from the set S c ;
  • the process of the UE determining the candidate single-subframe resource set S in the carrier set C includes:
  • each carrier group consists of at least one carrier
  • the carrier set C includes R carrier groups
  • the carriers in the carrier group G are denoted by g 0 , g 1 ,..., g M1-1 ;
  • one carrier-group single-subframe resource in carrier group G includes continuous subchannels starting from subchannel on carrier g 0 of subframe , continuous subchannels starting from subchannel on carrier g1 of subframe ,..., and continuous subchannels starting from subchannel on carrier g M1-1 of subframe , wherein
  • y denotes a relative index of the subframe in the resource pool
  • a total number of single-subframe resources in carrier group G is denoted by , the candidate single-subframe resources constitute the set and are greater than or equal to 0; a union of all carrier-group single-subframe resource sets of the carrier set C is the candidate single-subframe resource set S, wherein the carrier-group single-subframe is a single-subframe resource which includes subchannels located on at least one carrier of one carrier group.
  • the process of the UE selecting at least one single-subframe resource in the set S according to any one of:
  • the UE selecting one carrier-group single-subframe resource for data transmission in the set S, wherein the UE randomly selects one carrier-group single-subframe resource with equal probability from the set S; or, the UE randomly selects one carrier group G with equal probability from all carrier groups of the carrier set C, and randomly selects one carrier-group single-subframe resource with equal probability from the set S G ;
  • the UE selecting multiple carrier-group single-subframe resources for data transmission from the set S, wherein the UE selects at most one carrier-group single-subframe resource in each carrier group; or, the UE randomly selects at least two carrier groups with equal probability or selects all carrier groups of carrier set C, and randomly selects one carrier-group single-subframe resource with equal probability in each selected carrier group.
  • the method before the UE selecting the at least one single-subframe resource in the set S, the method further includes: the UE excluding one or more candidate single-subframe resources from the set S according to a PSCCH detected in the channel detecting window and an S-RSSI measured in the channel detection window;
  • the process of the UE selecting at least one single-subframe resource in the set S comprises: the UE selecting at least one single-subframe resource in remaining carrier-group single-subframe resources of the set S.
  • the process of the UE excluding one or more candidate single-subframe resources from the set S according the PSCCH detected in the channel detecting window and the S-RSSI measured in the channel detecting window includes:
  • the PSCCH reserves the same frequency resource in subframe , and the PSSCH-RSRP measured on a PSSCH scheduled by the PSCCH is higher than a threshold , wherein denotes a value of the priority field in a subsequently transmitted PSCCH indicated by a higher layer of the UE, denotes a threshold for the PSSCH-RSRP when the value of the priority field of the subsequently transmitted PSCCH indicated by the higher layer of the UE is , whereas the measured priority of the PSCCH is ; then:
  • carrier c belongs to carrier group G, for any carrier-group single-subframe resource in subset S G of set S, if there is a variable which makes a carrier-group single-subframe resource overlap with the reserved resource indicated in the PSCCH, wherein C resel denotes the number of times of that the resource is to be reserved after resource reselection of the UE, denotes an assumed resource reservation period for determining the available candidate single-subframe resource indicated by higher layer of the UE, the UE deleting the single-subframe resource from the set S G ;
  • the method before the UE selecting the at least one single-subframe resource in the set S, the method further includes: if the UE is to perform a receiving operation in at least one subframe after subframe n on at least one carrier, the UE excluding one or more candidate single-subframe resources which overlap or conflict with the at least one subframe from the set S.
  • the receiving operation that the UE is to perform includes any one of:
  • the downlink control or data channel includes at least one of:
  • PDCCH Physical Downlink Control Channel
  • RAR Random Access Response
  • PDSCH Physical Downlink Shared Channel
  • PBCH Physical Broadcast Channel
  • a PDSCH transmitted in a Semi-Persistent Scheduling (SPS) manner.
  • SPS Semi-Persistent Scheduling
  • the method further includes:
  • the UE after the UE selects the at least one single-subframe resource, occupying the selected single-subframe resource for Y1 periods following a predefined resource reservation periodicity in a semi-persistent manner; when the UE occupies the selected single-subframe resource in the semi- persistent manner, if the size of data packets transmitted by the UE changes, and new data packets cannot be born by the current single-subframe resource even if the highest allowable modulation level and rate are used, the UE giving up the currently selected single-subframe resource, and reselecting a single-subframe resource according to the resource selection or reselection method; or, the UE keeping the currently selected single-subframe resource, and executing the resource selection or reselection method to select an additional single-subframe resource on a carrier other than that where the current single-subframe resource is located.
  • the method before transmitting the PSSCH, the method further includes:
  • the UE if the UE is to transmit signals on multiple carriers simultaneously, and the number of carriers on which the UE needs to perform transmission simultaneously is greater than the number of current available radio transmission chains of the UE, the UE prioritizing transmission of signals with a high priority and giving up transmission of signals with a low priority;
  • the UE if the UE is to transmit signals simultaneously on two or more carriers, and the UE does support simultaneous transmission on multiple carriers, the UE prioritizing transmission of signals with a high priority and giving up transmission of signals with a low priority;
  • the UE if the UE is to transmit signals on at least two carriers simultaneously, the UE adjusting a transmit power, wherein the signals include at least one of PSSCH, PSCCH and uplink signals;
  • the UE adjusting the transmit power according to the following:
  • process 1 if the value of a priority field of the PSCCH transmitted by the UE on at least one carrier is greater than or equal to thresSL-TxPrioritization , wherein thresSL-TxPrioritization denotes a specific priority threshold, the UE adjusting a sidelink transmit power on one or more carriers whose priority field has the value greater than or equal to thresSL-TxPrioritization , so as to make a total transmit power of the UE lower than an allowable maximum transmit power P CMAX of the UE;
  • process 2 if values of priority fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , or the total transmit power is still higher than P CMAX after the UE adjusts the transmit power on all carriers meeting the condition in process 1 to 0, and the UE transmits uplink signals on at least one carrier, the UE adjusting the transmit power of the uplink signals on the at least one carrier, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE;
  • process 3 if the values of the priority fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , and the UE does not transmit uplink signal on any carrier, the UE adjusting the sidelink signal transmit power on the carriers, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE;
  • the UE adjusting the transmit power according to the following:
  • the UE determining a priority of the transmission signal on each carrier, adjusting the transmit power of at least one carrier for transmitting data with lowest priority, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE; if the total transmit power of the UE is still higher than P CMAX after the transmit power of the at least one carrier with the lowest priority is adjusted to 0, the UE repeating the above operations for remaining carriers until the total transmit power of the UE is lower than the allowed maximum transmit power P CMAX of the UE;
  • the priority of the sidelink signal is determined by the value of the priority field in the PSCCH of the sidelink signal; the higher the value of the priority field, the lower the priority level; if there are uplink signals, the priority of the uplink signals is higher than the sidelink signal with priority value thresSL-TxPrioritization , but lower than the sidelink signal with priority value thresSL-TxPrioritization -1, thresSL-TxPrioritization denotes a specific priority threshold.
  • Embodiments of the present disclosure also provide a User Equipment (UE) for resource selection or reselection in a Vehicle to Vehicle/Pedestrian/Infrastructure/Network or Vehicle to Everything (V2X) communication, including: a candidate time-frequency resource determining module, a resource selection or reselection module and a transmitting module; wherein
  • UE User Equipment
  • the candidate time-frequency resource determining module is to determine at least one carrier on which the UE performs channel detection, and to determine a candidate single-subframe resource set;
  • the resource selection or reselection module is to select one or more single-subframe resources for data transmission from the candidate single-subframe resource set;
  • the transmitting module is to transmit PSSCH on the selected one or more single-subframe resources.
  • the UE firstly determines a carrier set C available for resource selection or reselection and a candidate single-subframe resource set S in the carrier set C. Then, the UE excludes some candidate single-subframe resources from the set S according to a channel detection result. Finally, the UE selects one or more single-subframes from the remaining single-subframe resources of eh set S for PSSCH transmission.
  • the probability of selecting the frequency resources in the same subframe is increased when the UE performs resource selection or reselection on multiple carriers, which effectively overcomes the half-duplex restriction and IBE interference existing in the multi-carrier sidelink communication scenario, and improves the performance of the V2X system.
  • Fig. 1 is a flow chart of a resource selection or reselection method according to an embodiment of the present disclosure.
  • Fig. 2 is a block diagram of user equipment (UE) which performs a resource selection or reselection method in V2X communication according to an embodiment of the present disclosure.
  • UE user equipment
  • Fig. 3 is a flowchart illustrating a resource allocation according to some embodiments of the present disclosure.
  • Fig. 4 is a schematic diagram illustrating a resource pattern according to some embodiments of the present disclosure.
  • Fig. 5 is a schematic diagram illustrating a single-slot resource consisting of RBGs according to some embodiments of the present disclosure.
  • Fig. 6 is a schematic diagram illustrating single-slot resources consisting of PRBs with specified indexes in RBGs according to some embodiments of the present disclosure.
  • Fig. 7 is a schematic diagram illustrating a candidate resource pattern in a specific resource selection window according to some embodiments of the present disclosure.
  • Fig. 8 is a block diagram illustrating a structure of an apparatus for resource allocation according to various embodiments of the present disclosure.
  • Fig. 9 is a flowchart illustrating a resource selection or reselection method according to some embodiments of the present disclosure.
  • Fig. 10 is a schematic diagram illustrating carrier group single-subframe resource according to some embodiments of the present disclosure.
  • Fig. 11 is a block diagram illustrating a structure of a UE for performing the resource selection or reselection in the V2X communication according to various embodiments of the present disclosure.
  • the "user equipment” and “terminal device” used herein comprise both a device of a wireless signal receiver, which is a device only having a wireless signal receiver with no transmitting capability, and a device comprising receiving and transmitting hardware, which is a device having receiving and transmitting hardware that is able to perform bidirectional communication on a bidirectional communication link.
  • Such device may comprise: cellular or other communication devices, which have a single circuit display or a multi-circuit display, or cellular or other communication devices without a multi-circuit display; a PCS (Personal Communications Service), which may combine voice, data processing, fax and/or data communication capabilities; a PDA (Personal Digital Assistant), which may comprise a radio frequency receiver, pager, Internet/Intranet access, network browser, notepad, calendar and/or GPS (Global Positioning System) receiver; and a conventional laptop and/or palmtop computer or other devices, which have a conventional laptop and/or palmtop computer or other devices comprising a radio frequency receiver.
  • a PCS Personal Communications Service
  • PDA Personal Digital Assistant
  • the "user equipment” and “terminal device” used herein may be portable, transportable and mounted in means of transportation (air, maritime and/or land), or appropriate and/or configured to run locally, and/or to run on earth and/or run at any other position in space in a distributed form.
  • the "user equipment” and “terminal device” used herein may further be a communication terminal, Internet access terminal, music/video playing terminal, for example, may be a PDA, MID (Mobile Internet Device) and/or mobile phone having a music/video playing function, and may also be a smart television, set top box, and the like.
  • the present application proposes a resource selection and reselection method in V2X communication.
  • Fig. 1 is a flow chart of a resource selection or reselection method according to an embodiment of the present disclosure.
  • a UE detects physical sidelink control channel (PSCCH) in a format of Sidelink Control Information (SCI) x transmitted by other UEs.
  • PSCCH physical sidelink control channel
  • SCI Sidelink Control Information
  • the UEs are UEs using Mode 4.
  • the UE detects the PSCCH transmitted by other UEs to obtain at least one of the following information: a transmission mode used by the UE which transmits the PSCCH, a priority of PSSCH scheduled by the PSCCH, frequency domain resource position of PSSCH scheduled by the PSCCH, a resource reservation period indicated by the PSCCH and the like.
  • the UE may detect SCI x on all PSCCH resources in a transmission resource pool currently selected by the UE, or only detect SCI x on some PSCCH resources in the transmission resource pool currently selected by the UE, for example, the UE determines positions of the some PSCCH resources by receiving signalling of an eNB. For example, the UE only detects SCI x on the last PSCCH resource on the frequency domain in each subframe in the transmission resource pool currently selected by the UE, or only detects SCI x on the last PSCCH resource on the frequency domain in some subframes in the transmission resource pool currently selected by the UE.
  • step 102 the UE selects a single-subframe resource from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • Defining a single-subframe resource is continuous subchannels starting from subchannel x on TTI , wherein y represents a relative index of the TTI in the resource pool, and is determined by high layers of UE, and represents the number of subchannels used for PSSCH transmission. If the UE performs resource selection or reselection on subframe n, then the UE should consider continuous subchannels on any one of subframes belonging to the resource pool within a range as candidate single-subframe resources, wherein T 1 and T 2 are determined by the UE embodiment, and T 1 ⁇ 4, 20 ⁇ T 2 ⁇ 100, denoting the total number of single-subframe resources as M total , and a set composed of M total candidate subframe resources as S.
  • the UE may consider that TTI length of single-subframe resource is the same as TTI length used by the UE when performing resource selection or reselection.
  • C resel represents the number of times that resources are planned to be reserved after UE resource reselection, and represents a resource reservation interval assumed when determining available candidate single-subframe resources which is indicated by UE high layer
  • the UE excludes the single-subframe resource when selecting or reselecting resources.
  • a single-subframe resource is selected from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • a single-subframe resource is selected from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • the particular PSCCH format is SCI 1 defined in 3GPP release 14, or a format different from the SCI 1 defined in 3GPP release 14, or a format which contains the same number of bits as SCI 1, meanings of fields in which are the same with those in SCI 1 defined in 3GPP release 14, and one or more particular bits in reserved bits filed are 1.
  • the UE further measures a sidelink reference signal received power of a PSSCH (PSSCH-RSRP) scheduled by SCI x. If the PSSCH-RSRP is higher than a particular threshold, then a single-subframe resource is selected from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • PSSCH-RSRP sidelink reference signal received power of a PSSCH
  • value of priority filed contained in SCI x is , a single-subframe resource where a PSSCH scheduled by the SCI x is , and value of PSSCH-RSRP measured by the UE on the single-subframe resource is greater than wherein represents value of a priority filed of a PSCCH to be transmitted next which is indicated by UE higher layer, ⁇ is a value configured or preconfigured by the eNB, and represents an ith SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331 V14.1.0, wherein , then the UE excludes the single-subframe resource R x,y from S when selecting or reselecting resources.
  • the UE further excludes resources in the set S in a manner defined in 3GPP release 14.
  • the UE transmits a physical sidelink shared channel (PSSCH) on selected single-subframe resources.
  • PSSCH physical sidelink shared channel
  • the SCI x is type I
  • type I may be a new PSCCH format different from existing SCI 1 (i.e. SCI 1 defined in 3GPP release 14), or type I has the same number of bits as the existing SCI 1, and the meanings of various fields are the same, but one or more particular bits in reserved bits field may be 1 (all bits in reserved bits field of existing SCI 1 are 0).
  • a UE selects single-subframe resources from single-subframe resources which do not overlap with single-subframe resources reserved by detected PSCCH when performing resource selection or reselection. The specific steps are as follows:
  • a UE detects SCI x transmitted by other UE(s).
  • UEs transmitting the SCI x are UEs using Mode 3.
  • a UE using Mode 3 determines values of various fields in the SCI x by receiving physical layer control signalling of an eNB.
  • the physical layer signalling should at least contain a value of a "number of subframes in a resource pool corresponding to a resource reservation interval" field in the SCI x indicated, and a value of "number of subchannels and positions of contained subchannels" field in the SCI x.
  • the physical layer signalling is UE-specific signalling, scrambled by a particular cell radio network temporary identifier (C-RNTI), and choosing which UE as a transmitting UE of the SCI x is determined by the eNB implementation.
  • C-RNTI cell radio network temporary identifier
  • a UE using Mode 3 determines values of various fields in the SCI x by receiving physical layer control signalling and higher layer signalling of an eNB.
  • the physical layer signalling should at least contain a value of a "number of subframes in a resource pool corresponding to a resource reservation interval" field in the SCI x indicated, and the higher layer signalling should contain a value of a "number of subframes in a resource pool corresponding to a resource reservation interval" field in the SCI x indicated.
  • the physical layer control signalling in the above two implementations should be distinguished from the downlink control indication format 5A (DCI 5A) defined in a current standard.
  • DCI 5A downlink control indication format 5A
  • SCI x differs from the existing SCI 1, and the content of the SCI x should contain one or more items of the following information: priority information, the number of subframes in a resource pool corresponding to a resource reservation interval D1, CRC, a subframe gap of a first reserved resource G1, and the number and positions of subchannels contained in single-subframe resources, wherein a subframe position of the first reserved resource means a gap between a subframe where the SCI x is located and a subframe where the first reserved resource is located.
  • the UE may replace D1 in the formula with Pstep or Pmin, wherein Pstep is a basic resource reservation interval of a current resource pool, while Pmin is a minimum resource reservation interval supported by the current resource pool.
  • Pstep is a basic resource reservation interval of a current resource pool
  • Pmin is a minimum resource reservation interval supported by the current resource pool.
  • fields and the number of bits of each field contained in the SCI x and the existing SCI 1 are the same, while a certain or certain particular bit(s) in seven bits in reserved bits field are 1, for example, the first bit in the reserved bits field is 1, in order to distinguish SCI x from SCI 1.
  • step 202 with regard to any one single-subframe resource in the set S, if there is a variable that makes a single-subframe resource overlap with a reserved resource indicated by the SCI x, wherein C resel represents the number of times that resources are planned to be reserved after UE resource reselection, and represents a resource reservation interval assumed when determining available candidate single-subframe resources which is indicated by the UE high layer, then the UE excludes the single-subframe resource R x,y from S when selecting or reselecting resources. Or, if a value of a priority field (Priority) contained in the SCI x is greater than a particular value, then the UE excludes the single-subframe resource from S in resource selection or reselection.
  • a priority field Priority
  • the UE may further exclude resources in the set S in a manner defined in 3GPP release 14.
  • the UE randomly selects one single-subframe resource from the remaining resources for data transmission.
  • step 203 the UE transmits the PSCCH on a PSCCH resource corresponding to the selected single-subframe resource, and transmits the PSSCH on the selected single-subframe resource.
  • the SCI x may be type II or type III, wherein type II is the same as the existing SCI 1 (i.e. SCI 1 defined in 3GPP release 14), and preferably, a transmitting UE of type II is a Rel-14 UE working in Mode 3.
  • Type III is different from the SCI 1, for example, the value(s) of one or more particular bits in reserved bits field is(are) 1.
  • a transmitting UE of type III is a new release UE working in Mode 4. According to implementation I of this case, if the data transmitted by a new release UE working in Mode 3 needs to be received by a legacy UE, the new release UE of Mode 3 transmits SCI type II.
  • the new release UE of Mode 3 transmits SCI type III.
  • SCI x type I, type II and type III are different from each other. If the SCI x received by the UE is type II, then after the UE receives the SCI x, the UE may further measure PSSCH-RSRP of a PSSCH scheduled by the SCI x.
  • the UE When the UE performs resource selection or reselection, with regard to any one single-subframe resource in candidate single-subframe resource set S, if it may overlap with a single-subframe resource reserved by the UE transmitting SCI x, then the UE should directly exclude it; or, if it may overlap with a single-subframe resource reserved by the UE transmitting SCI x, and the measured PSSCH-RSRP is greater than a certain particular threshold, then the UE should exclude the single-subframe resource; and preferably, the value of the particular threshold should be higher than wherein is a value of a priority field contained in the SCI x, represents a value of a priority field of PSCCH to be transmitted next indicated by a UE high layer, and represents an ith SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331 V14.1.0, .
  • the UE further measures PSSCH-RSRP of a scheduled PSSCH, and when the UE performs resource selection or reselection, with regard to any one single-subframe resource in candidate single-subframe resource set S, if the single-subframe resource may overlap with a single-subframe resource reserved in the SCI x, and the measured PSSCH-RSRP is greater than a certain particular threshold, then the UE should exclude the single-subframe resource.
  • the particular resource pool is a transmitting resource pool configured for a 3GPP release 14 Mode 3 UE. The steps are as follows:
  • a UE detects SCI x transmitted by other UE(s).
  • the UE can determine reserved resource in the following two ways:
  • the specific value is defined by a standard or configured by the eNB; and G3 is a value of a time gap between initial transmission and retransmission in the SCI 1, and D3 is the number of subframes corresponding to a value of a resource reservation interval field in the SCI 1.
  • value of individual element in the set ⁇ D3 0 , D3 1 , D3 2 , ..., D3 N-1 ⁇ is indicated via RRC layer signaling or physical layer signaling by eNB. If it is implementation I of this case, the set can represent number of subframes corresponding to SPS period used by the Rel-14 UE working in Mode 3 in the current resource pool.
  • the set can represent number of subframes corresponding to SPS period(s) used by the Rel-14 UE working in Mode 3, and number of subframes corresponding to SPS period(s) used by the new release UE working in Mode 3 and transmitting the date that needs to be received by a legacy UE.
  • step 302 if the SCI x is type II, with regard to any one single-subframe resource in the set S, if there is a variable that makes a single-subframe resource overlap with a reserved resource indicated by the SCI x, wherein C resel represents the number of times that resources are planned to be reserved after UE resource selection or reselection, and represents a resource reservation interval assumed when determining available candidate single-subframe resources which is indicated by the UE high layer, then the UE excludes the single-subframe resource from S when selecting or reselecting resources.
  • any one single-subframe resource in the set S there is a variable that makes a single-subframe resource overlap with a reserved resource indicated by the SCI x, wherein C resel overlap with a reserved resource indicated by the SCI x, wherein represents a resource reservation interval assumed when determining available candidate single-subframe resources which is indicated by the UE high layer. If a value of a priority field contained in the SCI x is greater than a particular value, then the UE excludes the single-subframe resource from S when selecting or reselecting resources.
  • any one single-subframe resource in the set S there is a variable in the set S, there is a variable overlap with a reserved resource indicated by the SCI x, wherein C resel represents the number of times that resources are planned to be reserved after UE resource selection or reselection, and represents a resource reservation interval assumed when determining available candidate single-subframe resources which is indicated by UE high layer.
  • the UE should measure PSSCH-RSRP of a PSSCH scheduled by the SCI x, with regard to any one single-subframe resource in the set S, there is a variable that makes a single-subframe resource overlap with a reserved resource indicated by the SCI x, wherein C resel represents the number of times that resources are planned to be reserved after UE resource selection or reselection, and represents a resource reservation interval assumed when determining available candidate single-subframe resources which is indicated by UE high layer, if the value of the measured PSSCH-RSRP is greater than , wherein represents a value of a priority field of a PSCCH to be transmitted next indicated by the UE high layer, and represents an ith SL-ThresPSSCH-RSRP in SL-ThresPSSCH-RSRP-List-r14 defined in 3GPP standard 36.331 V14.1.0, wherein , then the UE excludes the single-subframe resource from S in resource selection or
  • the UE may further exclude resources in the set S in a manner defined in 3GPP release 14.
  • the UE randomly selects one single-subframe resource from the remaining resources for data transmission.
  • step 303 the UE transmits the PSCCH on a PSCCH resource corresponding to the selected single-subframe resources, and transmits the PSSCH on the selected single-subframe resource.
  • UE working in Mode 3 can set the value of Priority field in PSCCH to a value lower than the priority indicated by high layer. Specifically, if the priority indicated by high layer is pr, the value of Priority field in PSCCH transmitted by UE can be set to pr- ⁇ , wherein ⁇ is a particular value, configured by eNB, defined in standard or preconfigured. In this way, UE working in Mode 3 can be better protected.
  • the SCI x may be type I, type II or type III. If the SCI x received by the UE is type I or type II, then after the UE receives the SCI x, the UE may further measure PSSCH-RSRP of a PSSCH scheduled by the SCI x, and when the UE performs resource selection or reselection, with regard to any one single-subframe resource in a candidate single-subframe resource set S, if it overlaps with a single-subframe resource reserved in the SCI x, then the UE should directly exclude it; or, if it overlaps with a single-subframe resource reserved in the SCI x, and the measured PSSCH-RSRP is greater than a certain particular threshold, then the UE should exclude the single-subframe resource.
  • the UE further measures PSSCH-RSRP of a scheduled PSSCH, and when the UE performs resource selection or reselection, with regard to any one single-subframe resource in a candidate single-subframe resource set S, if the single-subframe resource overlaps with a single-subframe resource reserved in the SCI x, and the measured PSSCH-RSRP is greater than a certain particular threshold, then the UE should exclude the single-subframe resource.
  • the steps are as follows:
  • a UE detects SCI x.
  • step 402 if the SCI x is type I, then the UE should exclude single-subframe resources which overlap with reserved resources of the SCI x from the set S according to the method in embodiment I; and if the SCI x is type II or type III, then the UE should exclude single-subframe resources which overlap with reserved resources of the SCI x from the set S according to the method in embodiment II. These will both not be described herein.
  • the UE may further exclude resources in the set S in a manner defined in 3GPP release 14.
  • the UE randomly selects one single-subframe resource from the remaining resources for data transmission.
  • step 403 the UE transmits the PSCCH on a PSCCH resource corresponding to the selected single-subframe resource, and transmits the PSSCH on the selected single-subframe resource.
  • a UE works in Mode 3
  • SCI x is type II.
  • the UE receives that resources allocated by eNB signalling have changed, for example, a data generation period or subframe offset indicated by the SCI x has changed, the UE at least performs channel detection on resources or some resources indicated by the eNB, and selects or reselects resources according to a detection result. The steps are as follows:
  • the UE starts performing channel detection after receiving a sidelink resource allocation indication (i.e. DCI 5A) transmitted by the eNB.
  • a sidelink resource allocation indication i.e. DCI 5A
  • the UE should detect subframe y.
  • the UE may also determine whether the resource is available by measuring S-RSSI based on subframe y and comparing the same with a particular threshold.
  • the above particular threshold is defined by a standard, configured or preconfigured by the eNB, wherein P rsvp_TX is a current resource reservation period of the UE, and indicated by the eNB.
  • the above particular threshold is defined by a standard, configured or preconfigured by the eNB, wherein P rsvp_TX is a current resource reservation period of the UE, and this value is indicated by the eNB.
  • the UE when a UE anticipates that a base station is to change a period of a configured SPS resource or a subframe offset, the UE starts performing a detection operation. For example, the UE transmits information about a service change to the base station, for example, a period change, or a change of subframe offset generated within the period, etc.; or the base station transmits indication information to the UE, notifying the UE that the period of the SPS resource or subframe offset is to be changed.
  • any one value of j in the above value range of j f the SCI x is received and resources scheduled or reserved by the SCI x overlap with , and PSSCH-RSRP of the resources scheduled by the SCI x exceeds a threshold, then the resource is available by measuring S-RSSI based on that before subframe y comparing the same with a particular threshold.
  • the above particular threshold is defined by a standard, configured or preconfigured by the eNB, wherein P rsvp_TX is a current resource reservation period of the UE, and this value is indicated by the eNB.
  • the UE should continuously perform channel detection on all resources of each subframe in a currently selected transmitting resource pool, or start performing channel detection when a UE data generation period changes, and report the channel detection result to the eNB.
  • the UE reports the channel detection result to the eNB in subframe n:
  • Condition 1 The UE satisfies bypass Buffer Status Report (BSR) condition in subframe n, and the service corresponding to the bypass BSR is a V2X service that the UE intends to send in the current resource pool.
  • BSR Buffer Status Report
  • subframe n is the first subframe in which there is uplink scheduling resource for UE after subframe x, where subframe x is the latest subframe in which the UE receives an indication of channel detection result reporting of the eNB.
  • the indication of channel detection result reporting of the eNB may be RRC layer signaling, MAC layer signaling or physical layer signaling.
  • the channel detection result reported by the UE should include channel conditions on part or all of the subchannels in the subframe range [n+a, n+b], and for any one of the reported subchannels, its channel conditions include at least one item of the following information: average S-RSSI on the sub-channel, PSSCH-RSRP on the sub-channel, the priority of PSSCH sent by the UE that reserves the sub-channel, the resource reservation period of the UE that reserves the sub-channel, and the like.
  • the UE when reporting the channel detection result, should further report the global positioning system (GPS) coordinates of the current location.
  • GPS global positioning system
  • channel detection mode is implementation IV
  • the UE selects single-subframe resources as transmitting resources for data transmission.
  • the UE transmits the PSCCH on a PSCCH resource corresponding to the selected single-subframe resources, and transmits the PSSCH on the selected single-subframe resources.
  • the UE operates in Mode 3. Under certain condition, the UE reports the channel detection result of the current resource pool to the eNB to assist the eNB in resource allocation.
  • the UE working in Mode 3 performs a receiving operation on a resource pool, for example, receiving V2X information and measured CBR from other UE(s), and therefore, the UE may observe traffic distribution on the resource pool, so that the UE may know which resources are relatively busy, and which resources are relatively idle in the resource pool. Therefore, the UE in Mode 3 may report information on traffic distribution in resource pool to the base station, so as to facilitate the base station scheduling data transmission of the UE in Mode 3 on relatively idle resources, thereby reducing the impact on users in Mode 4.
  • the above information on traffic distribution in resource pool may indicate an idle resource period and subframe offset.
  • the present disclosure does not limit the specific method for indicating information on traffic distribution in resource pool.
  • Steps are as follows:
  • the UE reports the channel detection result to the eNB in subframe n:
  • Condition 1 The UE satisfies bypass Buffer Status Report (BSR) condition in subframe n, and the service corresponding to the bypass BSR is a V2X service that the UE intends to send in the current resource pool.
  • BSR Buffer Status Report
  • subframe n is the first subframe in which there is uplink scheduling resource for UE after subframe x, where subframe x is the latest subframe in which the UE receives an indication of channel detection result reporting of the eNB.
  • the indication of channel detection result reporting of the eNB may be RRC layer signaling, MAC layer signaling or physical layer signaling.
  • the channel detection result reported by the UE should include channel conditions on part or all of the subchannels in the subframe range [n+a, n+b], and for any one of the reported subchannels, its channel conditions include at least one item of the following information: average S-RSSI on the sub-channel, PSSCH-RSRP on the sub-channel, the priority of PSSCH sent by the UE that reserves the sub-channel, the resource reservation period of the UE that reserves the sub-channel, and the like.
  • the UE when reporting the channel detection result, should further report the global positioning system (GPS) coordinates of the current location.
  • GPS global positioning system
  • the UE sends PSCCH and PSSCH on the resource indicated by DCI 5A or on the transmission resource determined according to the method in Case IV after receiving bypass resource allocation indication (that is, DCI 5A) sent by the eNB.
  • the UE working in Mode 3 determines the resource occupation and the resource reservation in the current resource pool by channel detection. After the UE reports the detection result to the eNB, the eNB may schedule the resource with a relatively high channel quality to the UE in Mode 3 for data transmission, thereby reducing the interference between user in Mode 3 and user in Mode 4.
  • Fig. 2 is a block diagram of user equipment (UE) which performs a resource selection or reselection method in vehicle to vehicle/pedestrian/infrastructure/network or Vehicle to Everything (V2X) communication according to an embodiment of the present disclosure.
  • the equipment comprises: a detection module 21, a resource selection or reselection module 22 and a transmitting module 23.
  • the detection module is used for detecting PSCCH transmitted by other UEs.
  • the detection module may detect the SCI x on all PSCCH resources in a transmitting resource pool currently selected by the UE, or only detect the SCI x on some PSCCH resources in the transmitting resource pool currently selected by the UE, for example, positions of the some PSCCH resources determined by receiving signalling of an eNB.
  • the resource selection or reselection module is configured to select single-subframe resources from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • single-subframe resources are selected from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • single-subframe resources are selected from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • the particular PSCCH format is SCI 1 defined in 3GPP release 14, or a PSCCH format different from the SCI 1 defined in 3GPP release 14, or a format which has the same number of bits as the SCI 1 defined in 3GPP release 14, and the meaning of each field is the same, but one or more bits in reserved bits field are 1.
  • the resource selection or reselection module further measures sidelink reference signal received power of a PSSCH (PSSCH-RSRP) scheduled by SCI x, if the PSSCH-RSRP is higher than a particular threshold, then single-subframe resources are selected from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH.
  • PSSCH-RSRP sidelink reference signal received power of a PSSCH
  • the transmitting module transmits physical sidelink shared channel (PSSCH) on the selected single-subframe resources.
  • PSSCH physical sidelink shared channel
  • the first UE refers to a UE which performs the channel detection and resource selection or reselection
  • the second UE refers to the UE detected by the first UE.
  • a slot refers to a minimum time unit for the first UE to transmit PSSCH.
  • the minimum time unit that the first UE transmits the PSSCH is referred to as a slot. This slot does not refer to the time resource size in the LTE system.
  • a physical resource block refers to a minimum frequency unit for the first UE to transmit PSSCH, i.e., the minimum frequency unit that the first UE transmits the PSSCH is referred to as a PRB, which is not the resource block size in the LTE.
  • various embodiments of the present disclosure provide a sidelink resource allocation method capable of ensuring low delay and high reliability. As shown in Fig. 3, the method includes the following.
  • a first UE determines a SideLink Grant (SLG).
  • SSG SideLink Grant
  • the SLG of the first UE includes information such as position information of M PSSCH transmission resources, modulation and coding scheme for transmitting a Transmission Block (TB), etc.
  • the M PSSCH transmission resources are used for M times of transmission of one TB, M is a specified value and may be defined by specifications, or configured by eNB or configured in advance. If the first UE is able to occupy multiple time-frequency resources of one SLG semi-persistently with a certain period, the SLG may further includes the length of the period for the semi-persistent occupation.
  • the first UE may determine the time-frequency position information of the multiple PSSCHs for the multiple times of transmission of one TB in the SLG through receiving one or more downlink control signaling of the base station, or the first UE may determine the time-frequency position information of the multiple PSSCHs through channel detection.
  • the time-frequency resources of the multiple PSSCHs may have a predefined binding relationship. In this case, the group of PSSCH time-frequency resources with the binding relationship is called a PSSCH resource pattern.
  • the first UE determines the SLG through receiving the one or more downlink control signaling of the base station, the one or more downlink control signaling of the base station shall further indicate the PSCCH transmission resources, when the first UE determines the SLG via channel detection, the first UE selects one PSCCH transmission resource according to a channel detection result.
  • the modulation and coding scheme for transmitting the TB may be determined according to information such as priority of the data to be transmitted by the UE, moving speed, carrier frequency and current channel busy condition, etc.
  • step S302 the first UE transmits the PSSCH according to the SLG.
  • the PSSCH is scheduled by the transmitted PSCCH.
  • the PSCCH and the PSSCH scheduled by the PSCCH may be transmitted in a time division manner, e.g., transmitted on different symbols of the same slot, or transmitted in different slots.
  • the PSCCH and the PSSCH scheduled by the PSCCH may also be transmitted in a frequency division manner, e.g., transmitted on different physical resource blocks (PRBs) of the same slot.
  • PRBs physical resource blocks
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the first UE determines the position information of multiple PSSCH time-frequency resources in the SLG through receiving one or more downlink control signaling of the base station, and there is no binding relationship between the multiple PSSCH time-frequency resources contained in the SLG.
  • the downlink control signaling should include the position of multiple PSSCH time-frequency resources used for M times of transmissions of one TB.
  • the downlink control signaling includes at least the following information:
  • the first UE receives the downlink control signaling in slot n1, the first slot which is after slot n1+k and belonging to the current resource pool of the first UE is the slot where the resource for first time transmission in the SLG is located, wherein k is a specified integer and is determined according to the processing capability of the first UE and the slot configuration of the current carrier.
  • the first UE may determine the value of k according to configuration of the base station or definition of the specifications.
  • the first UE determines configuration of the resource pool according to signaling of the base station.
  • the SLG further indicates positions of the slots where time-frequency resources for the other M-1 times of transmission are located.
  • bits in the SLG indicate the positions of slots wherein the time-frequency resources for the second time till the M-th time transmission are located, the positions indicate M-1 slots within slots [n1+k+1, n1+k+T], wherein T is a specified value configured by the base station or defined by specifications.
  • N ⁇ M e.g. 1 or 2.
  • the UE receives downlink control signaling A in slot n2
  • the first PSSCH transmission resource indicated by the downlink control signaling A is located in slot n2+k.
  • each downlink control signaling includes a downlink control signaling index, the index is within [0, M/N-1], the PSSCH transmission resources indicated by the continuous M/N downlink control signaling indexed from 0 to M/N-1 form an SLG.
  • an occupation manner of the time-frequency resources in the SLG may be determined.
  • the occupation manner may be semi-persistent occupation with a predefined time interval or one-time occupation.
  • the first UE may semi-persistently occupy the time-frequency resources in the SLG with the time interval predefined by the base station.
  • the first UE may receive the high-layer signaling (RRC layer signaling) of the base station to determine the time interval.
  • the first UE may determine the time interval according to the one or more downlink control signaling indicating the SLG.
  • the first UE may occupy the time-frequency resources in the SLG only once, i.e., only transmit the PSSCH using the time-frequency resources in the SLG for one time.
  • the first UE may indicate it via the one or more downlink control signaling indicating the SLG.
  • the first UE determines whether the resources in the SLG can be semi-persistently occupied or can be occupied one time according to the corresponding downlink control signaling.
  • the downlink control signaling indicating semi-persistent occupation and one-time occupation may adopt different scrambling sequences.
  • the first UE determines the scrambling sequence used by the downlink control signaling via blind detection, and then determines the type of the SLG (semi-persistent occupation or one-time occupation).
  • the PSCCH transmitted by the UE may indicate only the time-frequency resource position of the currently scheduled PSSCH, or indicate the position of the currently scheduled PSSCH and the next PSSCH transmission, or indicate the position of M PSSCH transmission resources for transmitting one TB at the same time.
  • the first UE determines the resource pattern of the SLG through receiving control signaling of the base station.
  • the resource pattern may be defined as M PSSCH transmission resource units across a time period T and a frequency range F (referred to as a resource pattern space), it repeats each time period T, the first PSSCH transmission resource unit and the last PSSCH transmission resource unit contained in one resource pattern have a time-domain gap less than or equal to the sum of a maximum tolerated delay for the data transmission of the first UE and the time required for coding the PSSCH.
  • each resource pattern corresponds to a unique resource pattern index.
  • the first UE may determine the resource pattern space through receiving the signaling of the base station.
  • Fig. 4 provides a possible resource pattern.
  • the resource pattern index wherein , denoting a time-domain index of the t-th PSSCH transmission resource unit in the pattern space.
  • the frequency-domain indexes of its PSSCH transmission resources are . According to the relationship between the time-domain and frequency-domain indexes and the resource pattern index and the resource pattern index r, it is possible to determine a unique resource pattern in the resource pattern space.
  • the downlink control signaling of the base station may include the resource pattern index r of the resource pattern of the SLG, if the first UE receives the downlink control signaling of the base station in slot n3, the first UE determines the first resource pattern with index r after slot n3+k as the allocated SLG resources.
  • the first UE may determine the occupation manner of the resources in the SLG, e.g., semi-persistent occupation or one-time occupation.
  • the first UE may semi-persistently occupy the time-frequency resources in the SLG with the time interval predefined by the base station.
  • the first UE may receive the high-layer signaling (RRC layer signaling) of the base station to determine the time interval.
  • the first UE may determine the time interval according to the one or more downlink control signaling indicating the SLG.
  • the time interval is an integer times of the resource pattern space periodicity T.
  • the first UE may occupy the time-frequency resources in the SLG only once, i.e., only transmit the PSSCH using the time-frequency resources in the SLG for one time.
  • the first UE determines whether the resources in the SLG can be semi-persistently occupied or can be occupied one time according to the one or more downlink control signaling indicating the SLG.
  • the downlink control signaling indicating semi-persistent occupation and one-time occupation may adopt different scrambling sequences.
  • the first UE determines the scrambling sequence used by the downlink control signaling via blind detection, and then determines the type of the SLG (semi-persistent occupation or one-time occupation).
  • the PSCCH transmitted by the UE may indicate the resource pattern index for the PSSCH scheduled by the PSCCH, via an explicit or implicit manner. For example, there is a fixed mapping relationship between positions of the PSCCH frequency resources and the positions of the RBs occupied by the PSSCH transmission resource pattern in the current slot. Thus, the index of the resource pattern may be implicitly indicated by the frequency resource index of the PSCCH.
  • the first UE determines position information of multiple PSSCH time-frequency resources in the SLG through channel detection. There is no binding relationship between the multiple PSSCH time-frequency resources contained in the SLG.
  • the first UE performs SLG determination operation in slot n4.
  • PRB group (RBG)
  • the RBG is taken as a resource allocation unit (i.e., downlink resource allocation manner 0 defined in current LTE specifications)
  • the first UE regards L RBG RBGs in any slot belonging to the current resource pool of the first UE and within [n4+T 1 , n4+T 2 ] as a candidate single-slot resource, as shown in Fig. 5, referred to as single-slot resource format 0 hereinafter.
  • RBG is configured, and the RBG is taken as a resource allocation unit, but in each RBG only one PRB with the same index can be allocated (i.e.
  • the first UE takes L RB PRBs in any slot which is belonging to the current resource pool of the first UE and within [n4+T 1 , n4+T 2 ] as a candidate single-slot resource, hereinafter referred to as single-slot resource format 2.
  • the values of T 1 and T 2 are determined according to implementation of the UE. [n4+T 1 , n4+T 2 ] is referred to as a resource selection window, L RBG , , or L RB are determined by higher layer of the first UE, e.g., MAC layer of the first UE.
  • the total number of single-slot resources in the resource selection window is denoted by M total , M total candidate single-slot resources constitute a set S.
  • the first UE may detect in slots in a channel detection window before slot n4, wherein the channel detection window is defined by specifications, e.g., slots n4-1000, n4-999, ...,n4-1 may be defined as the channel detection window.
  • the first UE decodes the PSCCH in the slot, determines the number of successfully decoded PSCCH in each slot, and measures a reference signal receiving power of the scheduled PSSCH, priority of data transmitted on the PSSCH and resource reservation interval for the PSSCH transmission resources according to the decoded PSCCH.
  • an average receiving energy of each RBG or each RB in the slot may be measured.
  • the first UE measures the average receiving energy of each RBG in the detected slot.
  • the first UE measures the average receiving energy of each RB in the detected slot.
  • the first UE estimates, according to a measurement result in the channel detection window, the number of second UEs which may perform PSCCH transmission in each candidate slot in the resource selection window, the PSSCH reference signal receiving power on the candidate single-slot resource, and the average receiving energy of each RB or each RBG.
  • the estimation may be performed similarly as a conventional method, which is described in the following.
  • the first UE may estimate the PSSCH reference signal receiving power on a candidate single-slot resource in the resource selection window as follows: if the first UE successfully detects the PSCCH in slot y of the channel detection window, and measures the reference signal receiving power of the PSSCH scheduled by the PSCCH, suppose that the PSCCH indicates a resource reservation interval p and slot y+p still belongs to the resource selection window, the first UE regards that the second UE which transmits the PSSCH will also transmit PSSCH on the same frequency position in slot y+p, and the reference signal receiving power of the PSSCH is the same.
  • the first UE may estimate the average receiving power of each RB or each RBG in the resource selection window as follows: for any RB or RBG in any slot x in the resource selection window, the first UE regards that an average value of the receiving energies measured on the same RB or RBG in slots x-j*Pm as the average receiving energy of the RB or the RBG in the slot x.
  • Pm denotes a measurement interval, it may be defined by specifications, or configured by the eNB or preconfigured, e.g., Pm is 100, or equal to a reservation interval for the data to be transmitted by the first UE, or equal to a minimum resource reservation interval allowed by the current resource pool; j includes all positive integers which make x-j*Pm belonging to the channel detection window.
  • the first UE selects from set S, according to the above estimation result, M single-slot resources in which the second UE occupies relatively less resources to determine the SLG.
  • the selection may be configured according to a practical requirement.
  • the principle for selecting the M single-slot resources is to select those with fewer resources occupied by other UEs as much as possible. As such, the data of the first UE may have a little probability to collide with other UEs and lost, and the data transmission reliability may be increased.
  • M single-slot resources on which resources occupied by the second UE is lower than a defined requirement may be selected.
  • the defined requirement may be either an explicit requirement, or a requirement implicitly generated based on the selection of the M single-slot resources.
  • the second UE may be not a single one, but include multiple UEs detected by the first UE. Hereinafter, one selection manner is provided.
  • the first UE may select M single-slot resources located in different slots from set S to determine the SLG according to one of the following steps:
  • the first UE selects X% slots with minimum number of successfully decoded PSCCH in the resource selection window as candidate slots;
  • the first UE excludes single-slot resources with PSSCH reference signal power higher than a specified threshold from the single-slot resources of the candidate slots according to the PSSCH reference signal receiving power and the priority of the data transmitted by the PSSCH, the specified threshold is relevant to the priority of the data transmitted by the PSSCH and the priority of the data to be transmitted by the first UE.
  • the first UE sorts, after some single-slot resources are excluded through step 2, the remaining single-slot resources of the candidate slots according to their receiving energies, selects M single-slot resources located in different slots from Y% single-slot resources with lowest receiving energy, and takes the selected M single-slot resources as the M PSSCH transmission resources of the SLG; wherein when selecting the M single-slot resources from the Y% single-slot resources with lowest receiving energy, the selection may be performed according to a requirement, e.g., randomly select with equal probability.
  • X and Y are both specified values, which may be configured by the base station, preconfigured or defined by specifications.
  • the selected M single-slot resources are located in different slots.
  • the first UE may semi-persistently occupy the time-frequency resources of the SLG with a specified interval.
  • the specified interval may be determined by a higher layer of the UE (e.g., MAC layer of the UE).
  • the PSCCH transmitted by the UE may indicate merely the time-frequency resource positions of the currently scheduled PSSCH, or indicate the resource positions of both the currently scheduled PSSCH and a next PSSCH, or indicate the positions of M PSSCH transmission resources used for one TB transmission at the same time.
  • a PSSCH resource pattern is predefined.
  • the first UE determines the resource pattern in the SLG by channel detection.
  • the resource pattern may be defined as M PSSCH transmission resource units across a time period T and a frequency range F (referred to as a resource pattern space), it repeats each time period T, the first PSSCH transmission resource unit and the last PSSCH transmission resource unit contained in one resource pattern have a time-domain gap less than or equal to the sum of a maximum tolerated delay for the data transmission of the first UE and the time required for coding the PSSCH.
  • each resource pattern corresponds to a unique resource pattern index.
  • the first UE may determine the resource pattern space through receiving the signaling of the base station.
  • the first UE should regard any resource pattern whose starting subframe and ending subframe are both located within slots [n4+T 1 , n4+T 2 ] as a candidate resource pattern, as shown in Fig. 7.
  • the values of T 1 and T 2 are determined according to implementation of the UE. [n4+T 1 , n4+T 2 ] is referred to as a resource selection window.
  • the total number of candidate resource patterns in the resource selection window is denoted by , candidate resource patterns form a set S P .
  • the first UE may detect in slots in the channel detection window before slot n4, wherein the channel detection window is defined by specifications, e.g., slots n4-1000, n4-999, ...,n4-1 may be defined as the channel detection window.
  • the first UE decodes the PSCCH in the slot, measures reference signal average receiving power of multiple PSSCHs on the resource pattern, priority of data transmitted by the PSSCHs and a resource pattern reservation interval according to the decoded PSCCH.
  • the first UE further measures an average receiving energy of the resource pattern in the channel detection window.
  • the first UE estimates, according to the measurement result in the channel detection window, PSSCH reference signal receiving power of each candidate resource pattern and average receiving energy of each candidate resource pattern in the resource selection window.
  • the estimation may be performed similarly as a conventional method, but the resource pattern is taken as a detection unit. The procedure is described in the following.
  • the first UE estimates the PSSCH reference signal receiving power of the candidate resource pattern in the resource selection window as follows: if the first UE successfully detects the PSCCH scheduling resource pattern Q in the channel detection window, and measures the PSSCH reference signal receiving power on the resource pattern Q, suppose that the PSCCH indicates a resource reservation interval p, the first UE regards that the second UE transmitting the above PSSCH will also transmit PSSCH on the same resource pattern after p slots, and the PSSCH reference signal receiving power on that resource pattern is the same.
  • the first UE may estimate the average receiving energy of each resource pattern in the resource selection window as follows: for any resource pattern Q in the resource selection window, the first UE regards an average of receiving energies measured on resource patterns with an interval of integer times of Pm starting from the resource pattern Q as the average receiving energy of the resource pattern Q.
  • Pm denotes a measurement interval, it may be defined by specifications, or configured by the eNB or preconfigured. For example, Pm may be equal to 100, or equal to a reservation interval for the data to be transmitted by the first UE, or equal to a minimum resource reservation interval allowed by the current resource pool.
  • the first UE selects according to the above estimation result a resource pattern with less resource being occupied by the second UE to determine the SLG.
  • the detailed selection manner may be configured according to a practical requirement. The principle for the selection is to select those with fewer resources occupied by other UEs as much as possible. As such, the data of the first UE may have a little probability to collide with other UEs and lost, and the data transmission reliability may be increased.
  • the resource pattern on which resources occupied by the second UE is lower than a defined requirement may be selected.
  • the defined requirement may be either an explicit requirement, or a requirement implicitly generated based on the selection of the resource pattern.
  • the second UE may be not a single one, but include multiple UEs detected by the first UE.
  • one selection manner is provided.
  • the first UE may select resource pattern from set S P to determine the SLG according to one of the following steps:
  • the first UE excludes resource patterns with PSSCH reference signal average receiving power higher than a specified threshold from the resource patterns of the set S P according to the estimated PSSCH reference signal average receiving power and the priority of the data transmitted by the PSSCH on the resource patterns in the set S P , the specified threshold is relevant to the priority of the data transmitted by the PSSCH and the priority of the data to be transmitted by the first UE.
  • the first UE sorts the remaining resource patterns of the set S P according to their average receiving energies, selects one resource pattern from Y% resource patterns with lowest receiving energy, and takes the selected resource pattern as the PSCCH transmission resources of the SLG; wherein when selecting the resource pattern from the Y% resource patterns with lowest receiving energy, the selection may be performed according to a requirement, e.g., randomly select with equal probability.
  • Y is a specified value, which may be configured by the base station, preconfigured or defined by specifications.
  • the first UE may occupy the resource pattern of the SLG semi-persistently with a specified time interval, the specified time interval may be determined by a higher layer of the UE (e.g., MAC layer of the UE).
  • a higher layer of the UE e.g., MAC layer of the UE.
  • the PSCCH transmitted by the UE may indicate the index of the transmission resource pattern of the PSSCH scheduled by the PSCCH.
  • the index may be indicated explicitly or implicitly. For example, there may be a fixed mapping relationship between the positions of the PSCCH frequency resources and the positions of the RBs occupied by the PSSCH transmission resource pattern in the current slot. Thus, the index of the resource pattern may be implicitly indicated by the frequency resource index of the PSCCH.
  • Some embodiments of the present disclosure also provide a resource allocation apparatus, applicable for implementing the above resource allocation method.
  • Fig. 8 is a block diagram illustrating a structure of the apparatus according to some embodiments of the present disclosure. As shown in Fig. 8, the apparatus includes: a determining unit 801 and a transmitting unit 802.
  • the determining unit is configured to determine a sidelink grant SLG.
  • the SLG includes positions of M PSSCH transmission resources, the M PSSCH transmission resources are used for M times of transmission of a Transmission Block (TB), M is an integer.
  • the transmitting unit is configured to transmit a PSCCH and the PSSCH according to the determined SLG.
  • the resource allocation method and apparatus provided by the embodiments of the present disclosure, it is possible to ensure the data transmission delay as well as decrease the half-duplex impact between different UEs, so as to improve data successful receiving rate.
  • the first UE refers to a UE which performs the channel detection and resource selection or reselection
  • the second UE refers to the UE detected by the first UE.
  • various embodiments of the present disclosure provide a resource selection or reselection method in V2X communication. This method is able to increase the probability that the UE selects the frequency resources of the same subframe during resource selection or reselection on multiple carriers, so as to solve the half-duplex restriction and IBE interference in the multi-carrier sidelink communication environment, and improve the performance of the V2X system.
  • This method is able to increase the probability that the UE selects the frequency resources of the same subframe during resource selection or reselection on multiple carriers, so as to solve the half-duplex restriction and IBE interference in the multi-carrier sidelink communication environment, and improve the performance of the V2X system.
  • Fig. 9 is a flowchart illustrating a resource selection or reselection method according to various embodiments of the present disclosure. As shown in Fig. 9, the method includes the following.
  • a first UE determines a carrier set C available for resource selection or reselection.
  • the carrier set C may include one or more carriers.
  • the UE may determine the available candidate carriers from a configured or pre-configured set C S of all carriers according to a current service type. Further, the UE may determine one or more carriers available for channel selection or reselection from the candidate carriers according to information such as Channel Busy Ratio (CBR) of each candidate carrier.
  • CBR Channel Busy Ratio
  • the first UE may select one or more carriers with the lowest CBR from the carrier set C S , or select one or more carriers with CBR lower than a certain threshold from the set C S , wherein the threshold may be defined by specifications, or configured by an eNB or pre-configured.
  • the number of carriers in the carrier set C is N1.
  • the UE may determine the above set C S of all carriers according to signalling SystemInformationBlockType21 or RRCConnectionReconfiguration defined in 3GPP TS 36.331 V14.3.0.
  • multiple or all carriers in the set C S may correspond to the same parameter typeTxSync, or, each carrier corresponds to its own parameter typeTxSync, but the values of all typeTxSync are same.
  • the carriers in the set Cs are divided into multiple carrier groups, each carrier group includes one or more carriers, the one or more carriers in one carrier group correspond to the same typeTxSync.
  • the value of the typeTxSync may be eNB or GNSS, denoting that the carriers preferably take the eNB or GNSS as a reference synchronization source.
  • the UE may determine the above set Cs of all carriers via pre-configuration.
  • the multiple or all carrier in the Cs may correspond to the same parameter syncPriority, or, each carrier corresponds to its respective parameter syncPriority, but the values of them are the same.
  • the carriers in the set Cs are divided into groups, each group include one or more carriers, the one or more carriers in each group correspond to the same syncPriority.
  • the value of syncPriority may be eNB or GNSS, denoting that the multiple carriers preferably take the eNB or GNSS as the reference synchronization source.
  • the configuration of Sidelink Synchronization Signal (SLSS) subframes on some or all carriers are the same.
  • SLSS transmission periodicity on each carrier in the same frequency band in the carrier set C, number of SLSS subframes in each SLSS transmission periodicity, and the offset of each SLSS transmission subframe in each SLSS transmission periodicity are the same, so as to ensure that the number and positions of subframes available for transmitting the PSCCH and PSSCH are the same on multiple carriers, and avoid that one subframe on one carrier overlaps with subframes on another one or more carriers.
  • the pre-configuration of Sidelink Synchronization Signal (SLSS) subframes on some or all carriers in the carrier set C should be the same. If subframe x is an SLSS subframe according to pre-configuration information, subframe x cannot be put into resource pool, i.e., bit map for resource pool configuration cannot map to subframe x.
  • SLSS Sidelink Synchronization Signal
  • SLSS subframes may be configured differently on some or all carriers.
  • subframe x is an SLSS subframe on any one of the carriers, subframe x on all carriers cannot be put into resource pool, i.e., bit map for resource pool configuration cannot map to subframe x.
  • resource pool i.e., bit map for resource pool configuration cannot map to subframe x.
  • the first UE may regard the carriers in the same frequency band as interfering carriers, or regards multiple carriers adopting the same transmission or receiving radio link as interfering carriers, or the first UE may determine the multiple interfering carriers according to configuration signaling or pre-configuration of the eNB. Or, if the carrier set C includes one or more carriers, the pre-configuration for the SLSS subframe on some or all carriers may be different. In this case, according to the pre-configuration information of each carrier, if subframe x is an SLSS subframe on any carrier, subframe x on all carriers cannot be put into the resource pool, i.e., bit map for resource pool configuration cannot map to subframe x.
  • the carrier set C includes one or multiple carriers, for some or all carriers of the carrier set C, the SLSS transmission subframes on these carriers and the resource are configured independently.
  • the carrier set C includes multiple carriers, for each carrier:
  • the first UE determine a candidate single-subframe resource set S from the carrier set C.
  • a single-carrier single-subframe resource if sub-channels included in a single-subframe resource are located on the same carrier, it is referred to as a single-carrier single-subframe resource.
  • a single-subframe resource on any carrier c in the carrier set C includes continuous sub-channels starting from sub-channel x in subframe , wherein
  • y denotes a relative index of subframe in the resource pool
  • MAC layer e.g. MAC layer
  • the UE regards continuous sub-channels in subframes belonging to the resource pool within [n+T 1 , n+T 2 ] on carrier c as candidate single-subframe resources, wherein the determination of T 1 and T 2 are subject to the implementation of the UE.
  • the candidate single-subframe resources constitute a set S C .
  • a union of single-carrier single-subframe resource sets of the carriers in the carrier set C forms the candidate single-subframe resource set S.
  • the carriers in the carrier set C are divided into one or more carrier groups, and one carrier group includes one or more carriers.
  • carriers belonging to the same frequency band in the carrier set C are in the same carrier group.
  • subchannels included in one single-subframe resource may be located on multiple carriers in one carrier group, which is referred to as a carrier-group single-subframe resource.
  • the carrier group may be configured by the eNB or configured in advance, or may be determined by a higher layer of the UE (e.g. UE MAC layer).
  • the carrier set C includes R carrier groups
  • the carriers in the carrier group are respectively g 0 , g 1 , ...g M1-1 , then one carrier-group single-subframe resource in carrier group G is defined as continuous subchannels starting from subchannel on carrier g 0 of subframe , continuous subchannels starting from subchannel on garrier g 1 of subframe ,..., and continuous subchannels starting from subchannel on carrier g M1-1 of subframe , as shown in Fig. 10; wherein
  • y denotes a relative index of the subframe in the resource pool
  • the UE regards , , ..., continuous subchannels respectively on carriers g 0 , g 1 , ..., g M1-1 in any subframe belonging to the resource pool and within [n+T 1 , n+T 2 ] on the carrier group G as the candidate single-subframe resources, wherein the values of T 1 and T 2 are subject to the implementation of the UE.
  • the candidate single-subframe resources constitute a set S G .
  • a union of the single-subframe resources of all carrier groups in the carrier set C forms the candidate single-subframe resource set S.
  • the first UE excludes some candidate single-subframe resources from the set S.
  • this block is optional. If this block is not executed, the exclusion operation is not performed to the single-subframe resources in the set S. Accordingly, in following processing, operations performed with respect to remaining single-subframe resources in sets S, S C and S G , are adjusted to be performed to the sets S, S C and S G .
  • the UE may determine some candidate single-subframe resources to be excluded from the set S according to a determined receiving operation in a future subframe. That is, if the UE has determined to perform a receiving operation on one or more carriers in one or more subframes after subframe n, the UE may exclude some candidate single-subframe resources which overlap or conflict with the above one or more subframes from the set S.
  • the UE may determine some candidate single-subframe resources to be excluded from the set S according to a determined receiving operation in a future subframe. That is, if the UE has determined to perform a receiving operation on one or more carriers in one or more subframes after subframe n, the UE may exclude some candidate single-subframe resources which overlap or conflict with the above one or more subframes from the set S.
  • the UE has determined to perform a receiving operation in subframe m after subframe n on carrier c.
  • the first UE excludes all single-subframe resources in subframe y on all carriers interfering with carrier c from the set S.
  • the first UE may determine that all carriers in the same frequency band with carrier c are carriers interfering with carrier c, or determines carriers using the same transmission or receiving radio link with carrier c as carriers interfering with carrier c, or the first UE may determine the carriers interfering with carrier c according to configuration signaling of the eNB or a pre-configuration.
  • the determined receiving operation to be performed by the UE includes but is not limited to: receiving SLSS in subframe m on one or more carriers according to an SLSS receiving rule; receiving downlink control channel or data channel in subframe m on one or more carriers according to a downlink receiving control behavior or a data channel receiving behavior.
  • the downlink control or data channel includes at least one of:
  • PBCH Physical Broadcast Channel
  • a PDSCH transmitted in a semi-persistent scheduling manner.
  • the first UE may exclude some candidate single-subframe resources from the candidate single-subframe set S according to the PSCCH detected in a channel detection window and an S-RSSI measured in the channel detection window.
  • the UE may detect in subframes in the channel detection window before subframe n on each carrier of the carrier set C, the channel detection window may be defined by specifications, e.g., subframes n-1000, n-999, ...,a PDCCH indicating a Random Access Response (RAR) and a PDSCH carrying the RAR;
  • RAR Random Access Response
  • PBCH Physical Broadcast Channel
  • a PDSCH transmitted in a semi-persistent scheduling manner.
  • the first UE may exclude some candidate single-subframe resources from the candidate single-subframe set S according to the PSCCH detected in a channel detection window and an S-RSSI measured in the channel detection window.
  • the UE may detect in subframes in the channel detection window before subframe n on each carrier of the carrier set C, the channel detection window may be defined by specifications, e.g., subframes n-1000, n-999, ..., n-1 may be defined as a channel detection window.
  • the first UE measures the PSSCH-RSRP according to a decoded PSCCH and measures the S-RSSI of the subframe.
  • the first UE excludes the candidate single-subframe resources from the set S according to the following two steps.
  • the PSCCH reserves the same frequency resources in subframe , and the PSSCH-RSRP measured on the PSSCH scheduled by the PSCCH is higher than a threshold , wherein denotes the value of the priority field in a subsequently transmitted PSCCH indicated by the higher layer of the UE, is configured by the eNB or is pre-configured, and denotes a threshold for the PSSCH-RSRP when the value of the priority field of the subsequently transmitted PSCCH indicated by the higher layer of the first UE is , whereas the measured priority of the PSCCH is .
  • the set S is a single-carrier single-subframe resource set, for any single-carrier single-subframe resource in a subset S C of the set S, if there is a variable which makes the single-subframe resource overlap with reserved resources indicated in the PSCCH, wherein C resel denotes the number of times that resource is to be reserved after resource reselection of the UE, denotes the assumed resource reservation period for determining the available candidate single-subframe resource indicated by higher layer of the UE, the first UE excludes the single-subframe resource when performing resource selection or reselection, i.e., the first UE deletes the single-subframe resource from the set S C .
  • the set S is a carrier-group single-subframe resource set, and carrier c belongs to carrier group G, for any carrier-group single-subframe resource in subset S G in subset which makes the carrier-group single-subframe resource overlap with the reserved resources indicated in the PSCCH, wherein C resel denotes the number of times that resource is to be reserved after resource reselection of the UE, denotes the assumed resource reservation period for determining the available candidate single-subframe resource indicated by higher layer of the UE, the first UE excludes the single-subframe resource when performing resource selection or reselection, i.e., the first UE deletes the single-subframe resourc from the set S G .
  • the first UE excludes 1-X2% resources with highest from the remaining single-subframe resources in set S C , wherein X2 is a predefined value, it may be defined by specifications, or determined by the first UE according to configuration of the eNB, a pre-configuration or a current service type.
  • the first UE selects one or more single-subframe resources from the remaining single-subframe resources, and transmits the PSSCH on the selected resource.
  • the first UE may select only one single-carrier single-subframe resource from the remaining single-carrier single-subframe resources of the set S for data transmission. At this time, the first UE may randomly select one single-carrier single-subframe resource from the remaining single-carrier single-subframe resources of the set S with equal probability, or, the first UE may randomly select a carrier c from all carriers in the carrier set C with equal probability, and then randomly select a single-carrier single-subframe resource with equal probability from the remaining single-carrier single-subframe resources of the set S C .
  • the first UE may select multiple single-carrier single-subframe resources from the remaining single-carrier single-subframe resources of the set S for data transmission. At this time, the first UE may randomly select multiple or all carriers with equal probability from the carriers in the carrier set C, and randomly select one single-carrier single-subframe resource with equal probability from the remaining single-carrier single-subframe resources of each selected carrier.
  • the first UE may select multiple single-carrier single-subframe resources from the remaining single-carrier single-subframe resources of the set S for data transmission. At this time, the first UE sorts the carriers in the carrier set C according to their priorities or CBR, suppose that the order of the carriers is: carrier 0 > carrier 1 > ... > carrier N1-1.
  • the first UE randomly select one single-carrier single-subframe resource with equal probability from the remaining single-carrier single-subframe resources of carrier 0, and assume that the subframe where the selected single-carrier single-subframe resource is located is t0; then, if subframe t0 has remaining single-carrier single-subframe resources on carrier 1, the first UE randomly select one single-carrier single-subframe resource from them with equal probability, if subframe t0 does not have remaining single-carrier single-subframe resources on carrier 1, the first UE randomly select one single-carrier single-subframe resource from the remaining single-carrier single-subframe resources of carrier 1, assume the subframe that the single-carrier single-subframe resource selected on carrier 1 is t1; thereafter, the first UE selects single-carrier single-subframe resources on other carriers following the same method.
  • the first UE may select multiple single-carrier single-subframe resources from the remaining single-carrier single-subframe resources of the set S. At this time, the first UE selects at most one single-carrier single-subframe resource on each carrier, and indexes of subframes where the single-carrier single-subframe resource selected by the first UE are located have a minimum variance. If there are multiple selection manners with the minimum variance, the first UE may randomly select one of them with equal probability as the final selection.
  • the first UE may select only one carrier-group single-subframe resource from the remaining carrier-group single-subframe resources of the set S for data transmission. At this time, the first UE may randomly select one carrier-group single-subframe resource from the remaining carrier-group single-subframe resources of the set S; or, the first UE may randomly select a carrier group G with equal probability from all carrier groups of the carrier set C, and then randomly selects a carrier-group single-subframe resource with equal probability from the remaining carrier-group single-subframe resources of the set S G .
  • the first UE may select multiple carrier-group single-subframe resources from the remaining carrier-group single-subframe resources of the set S for data transmission. At this time, the first UE may select at most one carrier-group single-subframe resource from each carrier group. The first UE may randomly select multiple carrier groups or all carrier groups with equal probability from the carrier groups of the carrier set C, and then randomly select one carrier-group single-subframe resource with equal probability from the remaining carrier-group single-subframe resources of each selected carrier group.
  • the first UE will occupy the selected single-subframe resources for Y1 periodicities according to a particular resource reservation period, wherein Y1 is a random value within a range determined by higher layer of the UE, e.g., randomly determined by the MAC layer of the UE within 5 ⁇ 15.
  • Y1 is a random value within a range determined by higher layer of the UE, e.g., randomly determined by the MAC layer of the UE within 5 ⁇ 15.
  • the first UE may give up the current selected single-subframe resource, and performs the blocks S901 to S904 to reselect a single-subframe resource. Or, the first UE may keep the currently selected single-subframe resource, and performs the above blocks S901 to S904 to select an additional single-subframe resource on a carrier other than the carrier where the current single-subframe resource is located.
  • the multiple carriers on which the first UE performs channel detection and resource selection belong to one carrier group, i.e., the single-subframe resource is a carrier-group single-subframe resource.
  • This embodiment includes the following operations.
  • the first UE determines a carrier set C available for resource selection or reselection.
  • the carrier set C may include multiple carriers, and all carriers in the carrier set C belong to the same carrier group.
  • the number of carriers in the carrier set C is N.
  • the number and positions of the subframes used for SLSS transmission on respective carrier are completely the same. Or, if the configuration of the subframes used for SLSS transmission is different on the N1 carriers, all subframes used for SLSS transmission on the N1 carriers are not included in the resource pool.
  • the first UE determines a candidate single-subframe resource set S in the carrier set C.
  • the carriers in the carrier set C form a carrier group G
  • the carrier group G includes M carriers
  • the UE determines , ,... and may be zero.
  • the set S G is the set S.
  • the first UE excludes some candidate single-subframe resources from the set S according to a channel detection result.
  • the UE performs resource selection in subframe n.
  • the UE may detect in subframes of the channel detection window before subframe n on each carrier of the carrier set C, wherein the channel detection window is defined by specifications. For example, it may be defined that subframes n-1000, n-999, ..., n-1 form the window detection window.
  • the first UE measures PSSCH-RSRP of the subframe according to the decoded PSCCH, and measures S-RSSI of the subframe.
  • the candidate single-subframe resource exclusion step 1 may be performed as follows.
  • the PSCCH reserves the same frequency resources in subframe and value of the PSSCH-RSRP measured on the PSSCH scheduled by the PSCCH is greater than a specific threshold ; wherein denotes the value of the priority field in a subsequently transmitted PSCCH indicated by higher layer of the first UE, is configured by the eNB or is preconfigured, denoting a threshold value for the PSSCH-RSRP in the case that the value of the priority field in the subsequently transmitted PSCCH on carrier c indicated by the higher layer of the first UE is , whereas the priority field of the detected PSCCH is . Then:
  • any carrier-group single-subframe resource in the set S i.e. S G
  • C resel denotes the number of times that resource is to be reserved after resource reselection of the UE
  • assumed resource reservation period for determining available candidate single-subframe resources indicated by higher layer of the UE the first UE deletes the single-subframe resource from the set S G .
  • the candidate single-subframe resource exclusion step 2 may be performed as follows.
  • the value of the S-RSSI is denoted by .
  • the first UE excludes 1-X2% single-subframe resources with highest from the remaining single-subframe resources in the set S G .
  • the value of X2 may be defined by specifications, or configured by the first UE according to information such as eNB configuration, a pre-configuration, a current service type, etc.
  • the first UE selects one or more single-subframe resources from the remaining single-subframe resources in the set S and transmits the PSSCH on the selected resources.
  • the first may randomly select one carrier-group single-subframe resource with equal probability from the remaining carrier-group single-subframe resources of the set S, and transmit the PSSCH using the selected carrier-group single-subframe resources.
  • the UE may adjust the transmit power according to the following sequence.
  • Step 1 if the value of the priority field of the PSCCH transmitted by the UE on one or more carriers is greater than or equal to thresSL-TxPrioritization , this means that the PSSCH transmitted by the UE on the one or more carriers carries V2X data with a priority lower than thresSL-TxPrioritization , wherein thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured, the UE shall adjust the sidelink transmit power on one or more carriers whose "priority" field has the value greater than or equal to thresSL-TxPrioritization , so as to make the total transmit power of the UE lower than an allowable maximum transmit power P CMAX of the UE.
  • Step 2 if the values of the "priority" fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , or the total transmit power is still higher than P CMAX after the UE adjusts the transmit power on all carriers meeting the condition in step 1 to 0, and the UE transmits uplink signals on one or more carriers, the UE shall adjust the transmit power of the uplink signals on one or more carriers, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE.
  • Step 3 if the values of the "priority" fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , and the UE does not transmit uplink signal on any carrier, the UE shall adjust the sidelink signal transmit power on the carriers, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE.
  • the UE adjust the transmit power following step 1 of block S1004: the UE determines the priority of the transmit signal on each carrier, adjust the transmit power of one or more carriers used for transmitting data with lowest priority, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE. If the total transmit power of the UE is still higher than P CMAX after the power of the above carrier is adjusted to 0, the UE repeats step 1 of block S1004 for the remaining carriers until the total transmit power of the UE becomes lower than the allowed maximum transmit power P CMAX of the UE.
  • the priority of the sidelink signal is determined by the value of the "priority" field in the PSCCH of the sidelink signal. The higher the value of the priority field, the lower the priority level. If there are uplink signals, the priority of the uplink signals is higher than the sidelink signal with priority value thresSL-TxPrioritization , but lower than the sidelink signal with priority value thresSL-TxPrioritization -1, thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured, thresSL-TxPrioritization -1denotes thresSL-TxPrioritization minus 1.
  • the multiple carriers on which the first UE performs channel detection and resource selection belong to multiple carrier groups.
  • one or more carriers belonging to the same frequency band in carrier set C belong to the same carrier group.
  • the single-subframe resource is a carrier-group single-subframe resource. This embodiment includes the following operations.
  • the first UE determines a carrier set C available for resource selection or reselection.
  • the carrier set C includes multiple carriers, and the carriers in the carrier set C belong to multiple carrier groups.
  • the number of carriers in the carrier group C is N1
  • the N1 carriers respectively belongs to R carrier groups
  • the number and positions of subframes used for SLSS transmission are completely the same on the carriers within each carrier group.
  • the SLSS transmission subframes may be configured differently on the carriers within each carrier group, but all of the SLSS transmission subframes on the carriers within the carrier group are not used for configuring the resource pool.
  • the first UE determines a candidate single-subframe resource set S in the carrier set C.
  • the UE determines , ,..., continuous subchannels respectively on carriers g 0 , g 1 , ..., g M1-1 in any subframe belonging to the resource pool and within [n+T 1 , n+T 2 ] on the carrier group G as the candidate single-subframe resources, wherein T 1 and T 2 are subjected to the implementation of the UE.
  • the total number of single-subframe resources on carrier group G is denoted by , the candidate single-subframe resources constitute a set S G .
  • the candidate single-subframe resources constitute a set S G .
  • S G The union of the sets S G of all carrier groups forms the set S.
  • the first UE excludes some candidate single-subframe resources from the set S according to a channel detection result.
  • the UE performs resource selection in subframe n.
  • the UE may detect in subframes of the channel detection window before subframe n on each carrier of the carrier set C, wherein the channel detection window is defined by specifications. For example, it may be defined that subframes n-1000, n-999, ..., n-1 form the window detection window.
  • the first UE measures PSSCH-RSRP of the subframe according to a decoded PSCCH, and measures S-RSSI of the subframe.
  • the candidate single-subframe resource exclusion step 1 may be performed as follows.
  • the PSCCH reserves the same frequency resource on subframe , and value of the PSSCH-RSRP measured on the PSSCH scheduled by the PSCCH is greater than a specific threshold ; wherein denotes the value of the priority field in a subsequently transmitted PSCCH indicated by higher layer of the first UE, is configured by the eNB or is preconfigured, denoting a threshold value for the PSSCH-RSRP in the case that the value of the priority field in the subsequently transmitted PSCCH on carrier c indicated by the higher layer of the first UE is , whereas the priority field of the detected PSCCH is . Then:
  • carrier c belongs to carrier group G, for any carrier-group single-subframe resource in the set S G of the carrier group G, if there is a variable which makes the carrier-group single-subframe resource overlap with the reserved resource indicated in the PSCCH, wherein C resel denotes the number of times that resource is to be reserved after resource reselection of the UE, denotes an assumed resource reservation period for determining available candidate single-subframe resources indicated by higher layer of the UE, the first UE deletes the single-subframe resource from the set S G .
  • the candidate single-subframe resource exclusion step 2 may be performed as follows.
  • the first UE excludes 1-X2% single-subframe resources with highest from the remaining single-subframe resources in the set S G .
  • the value of X2 may be defined by specifications, or configured by the first UE according to information such as eNB configuration, a pre-configuration, a current service type, etc.
  • the first UE selects one or more single-subframe resources from the remaining single-subframe resources in the set S and transmits the PSSCH on the selected resources.
  • the manner that the first UE randomly selects the resource from the remaining single-subframe resources of S G should ensure that each remaining single-subframe resource has the same probability to be selected.
  • the UE may adjust the transmit power according to the following sequence.
  • Step 1 if the value of the priority field of the PSCCH transmitted by the UE on one or more carriers is greater than or equal to thresSL-TxPrioritization , this means that the PSSCH transmitted by the UE on the one or more carriers carries V2X data with a priority lower than thresSL-TxPrioritization , wherein thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured, the UE may adjust the sidelink transmit power on one or more carriers whose "priority" field has a value greater than or equal to thresSL-TxPrioritization , so as to make the total transmit power of the UE lower than an allowable maximum transmit power P CMAX of the UE.
  • thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured
  • Step 2 if the values of the "priority" fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , or the total transmit power is still higher than P CMAX after the UE adjusts the transmit power on all carriers meeting the condition in step 1 to 0, and the UE transmits uplink signals on one or more carriers, the UE may adjust the transmit power of the uplink signals on one or more carriers, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE.
  • Step 3 if the values of the "priority" fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , and the UE does not transmit uplink signal on any carrier, the UE may adjust the sidelink signal transmit power on the carriers, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE.
  • the UE adjust the transmit power following step 1 of block S1004: the UE determines the priority of the transmit signal on each carrier, adjust the transmit power of one or more carriers used for transmitting data with lowest priority, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE. If the total transmit power of the UE is still higher than P CMAX after the power of the above carrier(s) is adjusted to 0, the UE repeats step 1 of block S1004 for the remaining carriers until the total transmit power of the UE becomes lower than the allowed maximum transmit power P CMAX of the UE.
  • the priority of the sidelink signal is determined by the value of the "priority" field in the PSCCH of the sidelink signal. The higher the value of the priority field, the lower the priority level. If there are uplink signals, the priority of the uplink signals is higher than the sidelink signal with priority value thresSL-TxPrioritization , but lower than the sidelink signal with priority value thresSL-TxPrioritization -1, thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured, thresSL-TxPrioritization -1denotes thresSL-TxPrioritization minus 1.
  • the signals include PSSCH, PSCCH and uplink signals, if the number of carriers on which the UE needs to transmit signals is greater than the number of current available radio transmission chains of the UE, the UE prioritizes the transmission of signals with high priorities and gives up the transmission of signals with low priorities. If the UE needs to transmit signals on two or more carriers at a given time, the signals include PSSCH, PSCCH and uplink signals, and the UE does not support simultaneous transmission on the multiple carriers, the UE prioritizes the transmission of the signals with high priority and gives up the transmission of the signals with low priority.
  • the priority of the sidelink signal is determined by the value of the "priority" field in the PSCCH of the sidelink signal.
  • thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured
  • the carrier set C on which the first UE performs channel detection and resource selection is not configured with carrier group, i.e., the single-subframe resource is single-carrier single-subframe resource.
  • This embodiment includes the following operations.
  • the first UE determines a carrier set C available for resource selection or reselection.
  • the carrier set C includes multiple carriers, the number of carriers in the carrier group C is N.
  • the number and positions of subframes used for SLSS transmission are completely the same on the carriers in the carrier set C.
  • the SLSS transmission subframes may be configured differently on the carriers in the carrier set C, but all of the SLSS transmission subframes on the N1 carriers are not used for configuring the resource pool.
  • the first UE determines a candidate single-subframe resource set S in the carrier set C.
  • the UE may determine the continuous subchannels in any subframe belonging to the resource pool and within [n+T 1 , n+T 2 ] on carrier c as a candidate single-subframe resource, wherein T 1 and T 2 are subjected to the implementation of the UE.
  • the total number of single-subframe resources on carrier c is noted by , the candidate single-subframe resources form a set S C .
  • a union of the single-carrier single-subframe resource sets of all carriers in carrier set C is the set S.
  • the first UE excludes some candidate single-subframe resources from the set S according to a channel detection result.
  • the UE may perform detection in subframes within the channel detection window before subframe n on each carrier of the carrier set C, wherein the channel detection window may be defined by specifications, e.g., the channel detection window may include subframes n-1000, n-999, ..., n-1.
  • the first UE measures PSCCH-RSPR of the subframe according to a decoded PSCCH, and measures the S-RSSI of the subframe.
  • the candidate single-subframe resource exclusion step 1 may include following operations:
  • the PSCCH reserves the same frequency resource in subframe , and the value of the PSSCH-RSRP measured on the PSSCH scheduled by the PSCCH is greater than a specific threshold ; wherein denotes the value of the priority field in a subsequently transmitted PSCCH indicated by higher layer of the first UE, is configured by the eNB or is preconfigured, denoting a threshold value for the PSSCH-RSRP in the case that the value of the priority field in the subsequently transmitted PSCCH on carrier c indicated by the higher layer of the first UE is , whereas the priority field of the detected PSCCH is . Then:
  • the first UE excludes the single-subframe resource when performing resource selection or reselection, i.e., the first UE deletes the single-subframe resource from the set S C .
  • the candidate single-subframe resource exclusion step 2 is performed as follows.
  • the first UE excludes 1-X2% resources with highest from the remaining single-subframe resources in set S C , wherein X2 is a predefined value, it may be defined by specifications, or determined by the first UE according to configuration of the eNB, a pre-configuration or a current service type.
  • the first UE selects one or more single-subframe resources from the remaining single-subframe resources of the set S, and transmits PSSCH on the selected resources.
  • the first UE selects multiple single-subframe resources for PSSCH transmission from the remaining single-subframe resources of set S.
  • the first UE may select the multiple single-subframe resources via any one of the following manners.
  • Manner 1 the UE randomly selects multiple carriers in the carrier set C with equal probability or selects all carriers of the carrier set C, and randomly selects one single-carrier single-subframe resource from the remaining single-carrier single-subframe resources of each selected carrier with equal probability.
  • Manner 2 the first UE sorts the carriers in the carrier set C according to their priorities or CBR. Suppose that the carriers are sorted as: carrier 0 > carrier 1 > ... > carrier N1-1. Then, the first UE randomly selects one single-carrier single-subframe resource from the remaining single-carrier single-subframe resources of carrier 0. It is assumed that the subframe where the selected single-carrier single-subframe resource is located is subframe t0. Then, if there is remaining single-carrier single-subframe resource in subframe t0 on carrier 1, the first UE randomly selects one single-carrier single-subframe resource from subframe t0.
  • the first UE randomly selects a single-carrier single-subframe resource from the remaining single-carrier single-subframe resources of carrier 1.
  • the single-carrier single-subframe resource selected on carrier 1 is t1. Then, the first UE selects single-carrier single-subframe resources on other carriers following the same method.
  • Manner 3 the first UE selects at most one single-carrier single-subframe resource on each carrier, and the indexes of the subframes where the single-carrier single-subframe resources finally selected by the first UE has a minimum variance, if there are multiple selections with the minimum variance, the first UE may randomly select one of them as the final selection.
  • the method for selecting the m i single-carrier single-subframe resources from the X1 single-carrier single-subframe resources of carrier C i may be determined according to the implementation of the UE.
  • the method that the first UE selects the m i single-carrier single-subframe resources is able to ensure that the radio transmission capability of the first UE can support the PSSCH transmission on the m i single-carrier single-subframe resources.
  • the method that the first UE selects the m i single-carrier single-subframe resources shall minimize the half-duplex restriction between the single-carrier single-subframe resources.
  • the UE may adjust the transmit power according to the following sequence.
  • Step 1 if the value of the priority field of the PSCCH transmitted by the UE on one or more carriers is greater than or equal to thresSL-TxPrioritization , this means that the PSSCH transmitted by the UE on the one or more carriers carries V2X data with a priority lower than thresSL-TxPrioritization , wherein thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured, the UE may adjust the sidelink transmit power on one or more carriers whose "priority" field has a value greater than or equal to thresSL-TxPrioritization , so as to make the total transmit power of the UE lower than an allowable maximum transmit power P CMAX of the UE.
  • thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured
  • Step 2 if the values of the "priority" fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , or the total transmit power is still higher than P CMAX after the UE adjusts the transmit power on all carriers meeting the condition in step 1 to 0, and the UE transmits uplink signals on one or more carriers, the UE may adjust the transmit power of the uplink signals on one or more carriers, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE.
  • Step 3 if the values of the "priority" fields of the PSCCH on all current sidelink carriers of the UE are lower than thresSL-TxPrioritization , and the UE does not transmit uplink signal on any carrier, the UE may adjust the sidelink signal transmit power on the carriers, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE.
  • the UE adjust the transmit power following step 1 of block 204: the UE determines the priority of the transmit signal on each carrier, adjust the transmit power of one or more carriers used for transmitting data with lowest priority, so as to make the total transmit power of the UE lower than the allowed maximum transmit power P CMAX of the UE. If the total transmit power of the UE is still higher than P CMAX after the power of the above carrier is adjusted to 0, the UE repeats step 1 of block 204 for the remaining carriers until the total transmit power of the UE becomes lower than the allowed maximum transmit power P CMAX of the UE.
  • the priority of the sidelink signal is determined by the value of the "priority" field in the PSCCH of the sidelink signal. The higher the value of the priority field, the lower the priority level. If there are uplink signals, the priority of the uplink signals is higher than the sidelink signal with priority value thresSL-TxPrioritization , but lower than the sidelink signal with priority value thresSL-TxPrioritization -1, thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured, thresSL-TxPrioritization -1denotes thresSL-TxPrioritization minus 1.
  • the signals include PSSCH, PSCCH and uplink signals, if the number of carriers on which the UE needs to transmit signals is greater than the number of current available radio transmission chains of the UE, the UE prioritizes the transmission of signals with high priorities and gives up the transmission of signals with low priorities. If the UE needs to transmit signals on two or more carriers at a given time, the signals include PSSCH, PSCCH and uplink signals, and the UE does not support simultaneous transmission on the multiple carriers, the UE prioritizes the transmission of the signals with high priority, and gives up the transmission of the signals with low priority.
  • the priority of the sidelink signal is determined by the value of the "priority" field in the PSCCH of the sidelink signal.
  • thresSL-TxPrioritization denotes a priority threshold which may be configured by the eNB or preconfigured
  • Fig. 11 is a block diagram illustrating a UE for executing the resource selection or reselection method in V2X communication according to various embodiments of the present disclosure.
  • the UE includes: a candidate time-frequency resource determining module 1130, a resource selection or reselection module 1132, and a transmitting module 1133.
  • the candidate time-frequency resource determining module is to determine one or more carriers on which the UE performs channel detection, if a carrier group is configured, determine the number of the carrier groups and the number of carriers included in each carrier group; and to determine a candidate single-subframe resource set for each carrier or each carrier group;
  • the resource selection or reselection module is to select one or more single-subframe resources for data transmission from the candidate single-subframe resource set;
  • the transmitting module is to transmit a PSSCH on the selected one or more single-subframe resources.
  • the UE as shown in Fig. 11 may further include a resource detecting module 1131, to exclude some candidate single-subframe resources from the candidate single-subframe resources according to a PSCCH detected in a channel detection window and an S-RSSI measured in the channel detection window, or exclude some candidate single-subframe resources from the candidate single-subframe resources according another method described in block S1101.
  • the resource selection or reselection module is to select, after the channel detecting module performs the exclusion operation to the candidate single-subframe resources, one or more single-subframe resources for data transmission from the remaining single-subframe resources.
  • the present disclosure comprises devices for performing one or more of the operations in the present application.
  • These devices may be specially designed and manufactured for required objectives, or may also comprise known devices in a general-purpose computer.
  • These devices have computer programs stored therein, and these computer programs are selectively activated or reconstructed.
  • Such computer programs may be stored in a device (e.g. computer) readable medium or stored in any type of medium that is suitable for storing an electronic instruction and respectively coupled to a bus.
  • the computer readable medium comprises but is not limited to any type of disk (comprising a floppy disk, hard disk, optical disc, CD-ROM and magnetic optical disc), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or light card. That is, the readable medium comprises any medium that a device (e.g. computer) stores or transmits information in a readable form.
  • a device e.g. computer
  • computer program instructions may be used to implement each block in these structural diagrams and/or block diagrams and/or flow charts and combinations of blocks of these structural diagrams and/or block diagrams and/or flow charts.
  • these computer program instruction may be provided to a general-purpose computer, a specialized computer or a processor of other programmable data processing methods, so as to perform solutions specified in a block or multiple blocks in structural diagrams and/or block diagrams and/or flow charts disclosed in the present disclosure by a computer or a processor of other programmable data processing methods.
  • steps, measures and solutions in various operations, methods and flows which have been discussed in the present disclosure may be alternated, altered, combined or deleted.
  • steps, measures and solutions in various operations, methods and flows which have been discussed in the present disclosure may also be alternated, altered, rearranged, decomposed, combined or deleted.
  • steps, measures and solutions in various operations, methods and flows disclosed in the present disclosure in the prior art may also be alternated, altered, rearranged, decomposed, combined or deleted.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un procédé de sélection ou de resélection de ressources par un équipement d'utilisateur (UE) et l'UE dans une communication de véhicule à véhicule/piéton/infrastructure/réseau (V2X). Le procédé comprend les étapes consistant à : détecter un canal physique de commande de liaison latérale (PSCCH) transmis par un autre UE ou d'autres UE ; sélectionner (a) une ou plusieurs ressources de sous-trame unique à partir de ressources de sous-trame unique qui ne se recouvrent pas avec les ressources de sous-trame unique réservées par le PSCCH détecté ; et transmettre un canal physique partagé de liaison latérale (PSSCH) sur la ou les ressources de sous-trame unique sélectionnées.
PCT/KR2018/003478 2017-03-24 2018-03-23 Procédé de sélection de ressource dans une communication de véhicule à tout et appareil associé WO2018174661A1 (fr)

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US16/490,408 US11102631B2 (en) 2017-03-24 2018-03-23 Resource selection method in vehicle to everything communication and apparatus therefore
EP18772610.4A EP3574694A4 (fr) 2017-03-24 2018-03-23 Procédé de sélection de ressource dans une communication de véhicule à tout et appareil associé
US17/444,458 US11659371B2 (en) 2017-03-24 2021-08-04 Resource selection method in vehicle to everything communication and apparatus therefore

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CN201710182401 2017-03-24
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CN201710304754.X 2017-05-03
CN201710304754 2017-05-03
CN201710486403.5A CN109121209B (zh) 2017-06-23 2017-06-23 一种旁路通信中的资源分配方法和设备
CN201710486403.5 2017-06-23
CN201710488679 2017-06-23
CN201710488679.7 2017-06-23
CN201710682189.0 2017-08-10
CN201710682189 2017-08-10
CN201711059732.8 2017-11-01
CN201711059732 2017-11-01
CN201711160446.0 2017-11-20
CN201711160446.0A CN109121214B (zh) 2017-06-23 2017-11-20 一种v2x通信中的资源选择方法和设备
CN201810036887.8 2018-01-15
CN201810036887.8A CN108632781B (zh) 2017-03-24 2018-01-15 车对外界通信中的资源选择或重选方法及用户设备

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CN110891289A (zh) * 2019-11-08 2020-03-17 中国信息通信研究院 一种信道接入侦听方法和终端设备
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