[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO2019001702A1 - Techniques de traitement de signaux radio comprenant un code et une réplique du code - Google Patents

Techniques de traitement de signaux radio comprenant un code et une réplique du code Download PDF

Info

Publication number
WO2019001702A1
WO2019001702A1 PCT/EP2017/066021 EP2017066021W WO2019001702A1 WO 2019001702 A1 WO2019001702 A1 WO 2019001702A1 EP 2017066021 W EP2017066021 W EP 2017066021W WO 2019001702 A1 WO2019001702 A1 WO 2019001702A1
Authority
WO
WIPO (PCT)
Prior art keywords
code
sta
radio signal
replica
processor
Prior art date
Application number
PCT/EP2017/066021
Other languages
English (en)
Inventor
Genadiy Tsodik
Oded Redlich
Shimon SHILO
Doron Ezri
Original Assignee
Huawei Technologies 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
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2017/066021 priority Critical patent/WO2019001702A1/fr
Publication of WO2019001702A1 publication Critical patent/WO2019001702A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2609—Arrangements for range control, e.g. by using remote antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • 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) or DMT
    • 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—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH

Definitions

  • the present disclosure relates to techniques for processing radio signals comprising a code and at least one replica of the code, in particular for wireless communication such as WiFi between an access point (AP) and multiple stations (STAs) and vice versa.
  • the disclosure relates to timing advance for long range loT (Internet of Things) STAs in
  • 802.1 1 networks support distances of practically no more than 200m.
  • CP cyclic prefix
  • LoT Internet of Things
  • AP access point
  • OFDMA network 802.1 1 ax
  • uplink (UL) timing issues may arise due to long delays between clients that transmit simultaneously. Therefore, accurate timing is essential to prevent ISI in the UL; in other words, in order to prevent ISI in the UL, all clients' signals should arrive concurrently at the AP.
  • a main idea of the invention is to let every STA transmit its signal repetitively within the allocated bandwidth (BW).
  • BW allocated bandwidth
  • the repetition of the same signal in time allows AP to detect very long delays with a single detection window.
  • OFDM Orthogonal Frequency Division Multiplex
  • the invention relates to a station (STA), in particular a WiFi-STA, comprising: a processor configured to generate a radio signal based on a code and at least one replica of the code; and a transmitter configured to transmit the radio signal to an access point (AP).
  • STA station
  • AP access point
  • a code can be defined in time domain or in frequency domain. The code may serve as an identifier for detecting a specific section of the radio signal.
  • WIFI can comprise the whole standard family of the 802.1 1 standard.
  • Adding a special cyclic time signal in the UL random access process enables the AP to advantageously identify signals arriving simultaneously (or nearly simultaneously) from different clients with long delay between the clients.
  • the disclosed technique of radio signal generation and transmission by a STA allows detection of multiple STAs with different delays using a single detection window at the AP.
  • An advantage of such technique is that the maximum admissible delay can be longer than the guard interval.
  • the processor is configured to select the code from a plurality of orthogonal codes.
  • An orthogonal code can also be a near-orthogonal code that can be used for signal differentiation in the same way as an orthogonal code.
  • the STA can select a specific code to establish a special relation with the AP based on the selected code.
  • the selected code may indicate specific characteristics of the STA. For example, different codes may be selected for the original transmission and respective repetitions to allow the AP to detect between the original transmission and the repetitions.
  • the processor is configured to separate the code and the replica in the radio signal via a guard interval. The separation can be seamlessly, such that the code signal, the guard interval, and the replica follow directly after one another.
  • guard interval allows the AP to efficiently detect the code and the replica from the received radio signal which may be distorted due to multipath fading and interferences.
  • the processor is configured to generate the radio signal comprising the code and the at least one replica of the code without a guard interval in between.
  • the code and the replica can follow seamlessly. This provides the advantage that the resulting signal contains an additional linear phase in frequency which can be exploited by the AP to efficiently detect the radio signal.
  • the processor is configured to insert into the radio signal a cyclic prefix (CP) that comprises the code and/or the replica of the code.
  • CP cyclic prefix
  • the processor is configured to allocate a frequency bandwidth for transmission of the radio signal.
  • This provides the advantage that the AP can detect the radio signal within a specific frequency range, that is, the allocated frequency bandwidth.
  • the code and/or the replica of the code comprises an Orthogonal Frequency-Division Multiplexing (OFDM) symbol.
  • OFDM Orthogonal Frequency-Division Multiplexing
  • the processor is configured to randomly select the code.
  • the STA comprises: a receiver, configured to receive a message from the AP, the message comprising timing information for transmitting the radio signal.
  • This provides the advantage that a timing advance received from the AP can be calculated based on the radio signal comprising the code and the replica of the code by the STA.
  • the timing information comprises information about a time delay adjustment for transmitting the radio signal
  • the transmitter is configured to adjust a timing for transmitting the radio signal or another radio signal based on the information about the time delay adjustment.
  • This provides the advantage that multiple radio signals transmitted by different STAs can be correspondingly adapted by the respective STAs such that all signals receive at the AP within the same detection window. This simplifies the detection process at the AP.
  • the invention relates to an access point (AP) comprising: a receiver, configured to receive a radio signal from at least one STA, wherein the radio signal comprises a code and at least one replica of the code.
  • AP access point
  • a code can be defined in time domain or in frequency domain. The code may serve as an identifier for detecting a specific section of the radio signal.
  • the AP comprises a processor, configured to determine a time delay for a signal between the STA and the AP based on the code and/or the at least one replica of the code.
  • the AP can calculate an exact time delay of the radio signal between transmission at the respective STA and reception at the AP.
  • the AP comprises a transmitter, configured to send to the STA a timing information based on the determined time delay.
  • This provides the advantage that the STA can adjust its transmitter for sending the radio signal with a corresponding time delay such that radio signals of different STAs arrive within the same detection window at the AP receiver.
  • the processor is configured to identify different STAs based on codes and replicas of a plurality of received radio signals. This provides the advantage that the AP can cover large areas and simultaneously or nearly simultaneously serve a multitude of STAs.
  • the transmitter is configured to send different timing information to different STAs based on different time delays determined for the different STAs.
  • the different timing information in particular different timing advances, can be send via several unicast messages, via multicast messages, and/or via a single broadcast message.
  • Both the STA and the AP can be implemented as a part of the wireless communication standard such as 802.1 1 ax.
  • Fig. 1 shows a schematic diagram of an 802.1 1 network for illustrating the time difference problem
  • Fig. 2 shows a schematic diagram of a frame format illustrating a simple solution of the time difference problem
  • Fig. 3 shows a schematic diagram illustrating disadvantages of the frame format according to the simple solution depicted in Fig. 2;
  • Fig. 4 shows a schematic diagram illustrating a radio signal 400 with a frame format representing a solution of the time difference problem according to the disclosure;
  • Fig. 5 shows a schematic diagram illustrating an exemplary implementation form of a frame format illustrating a solution of the time difference problem according to the disclosure
  • Fig. 6 shows a block diagram of a station (STA) 600 according to the disclosure
  • Fig. 7 shows a block diagram of an access point (AP) 700 according to the disclosure
  • Fig. 8 shows a schematic diagram of a method 800 for transmitting a radio signal according to the disclosure
  • Fig. 9 shows a schematic diagram of a method 900 for receiving a radio signal according to the disclosure.
  • the described devices may include integrated circuits and/or passives and may be manufactured according to various technologies.
  • the circuits may be designed as logic integrated circuits, analog integrated circuits, mixed signal integrated circuits, optical circuits, memory circuits and/or integrated passives.
  • the methods and devices described herein may be implemented in wireless communication networks, in particular communication networks based on WiFi communication standards according to IEEE 802.1 1.
  • the methods and devices described herein may also be implemented in wireless communication networks based on mobile communication standards such as LTE, in particular 4.5G, 5G and beyond.
  • the described devices may include integrated circuits and/or passives and may be manufactured according to various technologies.
  • the circuits may be designed as logic integrated circuits, analog integrated circuits, mixed signal integrated circuits, optical circuits, memory circuits and/or integrated passives.
  • Radio signals may be or may include radio frequency signals radiated by a radio transmitting device (or radio transmitter or sender) with a radio frequency lying in a range of about 3 kHz to 300 GHz.
  • the frequency range may correspond to frequencies of alternating current electrical signals used to produce and detect radio waves.
  • the devices and systems described herein may include processors.
  • processor describes any device that can be utilized for processing specific tasks (or blocks or steps).
  • a processor can be a single processor or a multi-core processor or can include a set of processors or can include means for processing.
  • a processor can process software or firmware or applications etc.
  • the devices and systems described herein may process OFDM symbols with or without guard intervals.
  • OFDM is a frequency-division multiplexing scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels. Channel equalization is simplified because OFDM may be viewed as using many slowly modulated narrowband signals rather than one rapidly modulated wideband signal.
  • the low symbol rate makes the use of a guard interval between symbols affordable, making it possible to eliminate intersymbol interference (ISI) and utilize echoes and time-spreading to achieve a diversity gain, i.e. a signal-to-noise ratio improvement.
  • ISI intersymbol interference
  • OFDM OFDM
  • the beginning of each symbol is preceded by a guard interval. As long as the echoes fall within this interval, they will not affect the receiver's ability to safely decode the actual data, as data is only interpreted outside the guard interval.
  • the devices and systems described herein may process radio signals including cyclic prefix.
  • cyclic prefix refers to the prefixing of a symbol with a repetition of the end.
  • the receiver is typically configured to discard the cyclic prefix samples, the cyclic prefix serves two purposes: As a guard interval, it eliminates the intersymbol interference from the previous symbol.
  • As a repetition of the end of the symbol it allows the linear convolution of a frequency- selective multipath channel to be modelled as circular convolution, which in turn may be transformed to the frequency domain using a discrete Fourier transform (DFT) or a Fast Fourier transform (FFT). This approach allows for simple frequency-domain processing, such as channel estimation and equalization.
  • DFT discrete Fourier transform
  • FFT Fast Fourier transform
  • Fig. 1 shows a schematic diagram of an 802.1 1 network for illustrating the time difference problem.
  • the figure shows a wireless communication system, e.g. a WiFi communication network, with one access point (AP) and multiple stations (STAs).
  • AP access point
  • STAs stations
  • an exemplary number of two STAs is used for simplification reasons. Of course any other number of STAs can be used, e.g. 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 40, 50, 100, etc.
  • the two unassociated clients 101 , 102 are located such that one (in this example STA#1 ) is near the AP 103 and the other (in this example STA#2) is far from it.
  • the round-trip delay difference between them may be significantly higher than the cyclic prefix (CP).
  • CP cyclic prefix
  • a mechanism is required to estimate the delay of each station 101 , 102 and inform the STAs 101 , 102 of their delay.
  • the STAs 101 , 102 will use this information to start transmission earlier; hence all uplink (UL) transmissions will arrive at the AP 103 at the same (or nearly the same) time.
  • the delay of STA#1 is Ati while its round-trip delay is 2 Ati and the delay of STA#2 is ⁇ .2 while its round-trip delay is 2 ⁇ .2.
  • Fig. 2 shows a schematic diagram of a frame format illustrating a simple solution of the time difference problem.
  • a simple solution is to let each STA 101 , 102 choose from a bank of orthogonal sequences for transmission in order to allow the receiver of the AP to distinguish between them.
  • the AP can, for example, calculate the correlation between the received signal and possible sequences and in this way detect different STAs 101 , 102.
  • STA#1 can select first orthogonal sequences 201 while STA#2 can select second orthogonal sequences 202 which can be differentiated by the AP.
  • Fig. 3 shows a schematic diagram 300 illustrating disadvantages of the frame format according to the simple solution depicted in Fig. 2. Due to the delay between the STAs 101 , 102 AP cannot use a single window 301 for detection of this signal.
  • Fig. 4 shows a schematic diagram illustrating a radio signal 400 with a frame format representing a solution of the time difference problem according to the disclosure.
  • the figure illustrates the following principles that should be applied according to this disclosure:
  • Each client 101 , 102 transmits a single code on its tones (frequency allocation) - repetitively (several replicas) - so as to deal with the long delays;
  • the code may be selected from a code-bank
  • the AP 103 receives a signal that contains multiple codes and finds which code was transmitted and the code's (primary path) delay;
  • the AP 103 may report the estimated delays, e.g. in a DL broadcast message
  • Each client can adjust its timing based on this report.
  • a maximum round-trip delay difference of 16usec (equivalent to ⁇ 2.4Km maximum distance from the AP) may be assumed, which is significantly longer than the CP.
  • the CP is replaced by a concatenation of several replicas 410, 41 1 , 412 which act as a long CP - each replica 410, 41 1 , 412 is of duration 12.8usec (containing 256 samples) that matches the FFT size 401 ; this is similar to the L-LTF dual symbol design (within the 802.1 1 Legacy preamble).
  • Fig. 5 shows a schematic diagram illustrating an exemplary implementation form of a frame format 500 illustrating a solution of the time difference problem according to the disclosure.
  • an exemplary number of 3 replicas 521 , 522, 523 is used for delay estimation.
  • the AP's 103 receiver (Rx) uses the 2nd OFDM symbol 51 1 (in this example) for delay estimation by scanning all combinations of time shifts and codes.
  • more than 3 OFDM symbols 510, 51 1 , 512 may be allocated for timing advance purposes and the AP 103 may use multiple symbols (e.g. 2 nd & 3 rd ) 51 1 , 512 to enhance timing estimation performance.
  • the Rx ignores the first symbol 510 (a far STA's 102 transmission may arrive with an entire symbol delay) and the 3rd symbol 512 (a near STA's 101 transmission will end before this symbol 512).
  • the resulting signal contains an additional linear phase (in frequency) which can be advantageously taken into account at the AP's 103 receiver.
  • Fig. 6 shows a block diagram of a station (STA) 600 according to the disclosure.
  • the STA may be a WiFi-STA according to 802.1 1 , in particular 802.1 1 ax.
  • the STA includes a processor 601 and a transmitter 602.
  • the processor 601 is configured to generate a radio signal 605 based on a code 604 and at least one replica of the code 604, e.g. as described above with respect to Figures 4 and 5.
  • the transmitter 602 is configured to transmit the radio signal 605 to an access point (AP), e.g. an AP 103 as described above with respect to Figure 1 or an AP 700 as described below with respect to Figure 7.
  • AP access point
  • the processor 601 may select the code 604 from a plurality of orthogonal codes.
  • the processor 601 may separate the code 604 and the replica in the radio signal 605 via a guard interval 513.
  • the processor 601 may generate the radio signal 605 comprising the code 604 and the at least one replica of the code 604 without a guard interval 513 in between, e.g. as described above with respect to Figure 5.
  • the processor 601 may insert into the radio signal 605 a cyclic prefix (CP) that comprises the code 604 and/or the replica of the code 604, e.g. as described above with respect to Figures 4 and 5.
  • the processor 601 may allocate a frequency bandwidth for transmission of the radio signal 605.
  • the code 604 and/or the replica of the code 604 may include an Orthogonal Frequency-Division
  • the processor 601 may randomly select the code 604.
  • the STA 600 may include a receiver, configured to receive a message from the AP 103, 700, which message comprises timing information for transmitting the radio signal 605.
  • the timing information may include information about a time delay adjustment for transmitting the radio signal 605, e.g. as described above with respect to Figures 4 and 5.
  • the transmitter 602 may adjust a timing for transmitting the radio signal 605 or another radio signal based on the information about the time delay adjustment, e.g. as described above with respect to Figures 4 and 5.
  • Fig. 7 shows a block diagram of an access point (AP) 700 according to the disclosure.
  • the AP may be a WiFi-AP according to 802.1 1 , in particular 802.1 1 ax.
  • the AP includes a receiver 702 which is configured to receive a radio signal 705 from at least one STA, e.g. a STA 101 , 102, 1 10 as described above with respect to Fig. 1 or a STA 600 as described above with respect to Fig. 6.
  • the radio signal 705 comprises a code 712, 722, 732 and at least one replica of the code 712, 722, 732.
  • a first STA 101 transmits a radio signal 71 1 including a first code 712
  • a second STA 102 transmits a radio signal 721 including a second code 722
  • an N-th STA 1 10 transmits a radio signal 731 including an Nth code 732.
  • the receiver 702 includes a detection window 703 for detecting the radio signals 71 1 , 721 , 731 , e.g. as described above with respect to Figs. 4 and 5.
  • the AP 700 includes a processor 701 , configured to determine a time delay for a signal between the STA 101 , 102, 1 10, 600 and the AP 700 based on the code 712, 722, 732 and/or the at least one replica of the code 712, 722, 732, e.g. as described above with respect to Figs. 4 and 5.
  • the AP 700 may include a transmitter (not shown in Fig. 7), configured to send to the STA
  • the processor 701 may identify different STAs 101 , 102, 1 10 based on codes 712, 722, 732 and replicas of a plurality of received radio signals 71 1 , 721 , 731 , e.g. as described above with respect to Figs. 4 and 5.
  • the transmitter may send different timing information to different STAs 101 ,
  • Fig. 8 shows a schematic diagram of a method 800 for transmitting a radio signal according to the disclosure.
  • the method 800 may be performed by a STA 600 described above with respect to Fig. 6, in particular by the processor 601 of the STA 600.
  • the method 800 includes selecting 801 a code from a plurality of orthogonal or near- orthogonal codes for transmission to an access point (AP), e.g. an AP 700 described above with respect to Fig. 7.
  • AP access point
  • the method 800 further includes generating 802 a radio signal comprising the code and at least one replica of the code, e.g. as described above with respect to Fig. 6.
  • the method 800 further includes transmitting 803 the radio signal to the AP, e.g. as described above with respect to Fig. 6.
  • Fig. 9 shows a schematic diagram of a method 900 for receiving a radio signal according to the disclosure.
  • the method 900 may be performed by an AP 700 described above with respect to Fig. 7, in particular by the processor 701 of the AP 700.
  • the method 900 includes receiving 901 a plurality of radio signals from a plurality of stations (STAs), e.g. STAs 600 as described above with respect to Fig. 6, each radio signal received with a specific time delay, wherein each radio signal comprises a STA-specific orthogonal or near-orthogonal code and at least one replica of the code, wherein the plurality of radio signals are received within a detection window 703 in which at least one of the code or the at least one replica of the code fits, e.g. as described above with respect to Fig. 7.
  • STAs stations
  • STAs 600 stations 600 as described above with respect to Fig. 6
  • each radio signal received with a specific time delay
  • each radio signal comprises a STA-specific orthogonal or near-orthogonal code and at least one replica of the code
  • the plurality of radio signals are received within a detection window 703 in which at least one of the code or the at least one replica of the code fits, e.g. as described above with respect to
  • the method 900 further includes detecting 902 a respective STA and a time delay towards the respective STA based on the at least one of the code or the at least one replica of the code received within the detection window, e.g. as described above with respect to Fig. 7.
  • the present disclosure also supports a computer program product including computer executable code or computer executable instructions that, when executed, causes at least one computer to execute the performing and computing steps described herein, in particular the steps of the method described above.
  • a computer program product may include a readable non-transitory storage medium storing program code thereon for use by a computer.
  • the program code may perform the processing and computing steps described herein, in particular the method described above. While a particular feature or aspect of the disclosure may have been disclosed with respect to only one of several implementations, such feature or aspect may be combined with one or more other features or aspects of the other implementations as may be desired and advantageous for any given or particular application.

Landscapes

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

Abstract

L'invention concerne une station (STA) (600), en particulier WiFi-STA, comprenant : un processeur (601) configuré pour générer un signal radio (605) sur la base d'un code (604) et au moins une réplique du code (604) ; et un émetteur (602) configuré pour émettre le signal radio (605) à un point d'accès (AP) (103, 700). L'invention concerne en outre un point d'accès (AP) (700) comprenant : un récepteur (702), configuré pour recevoir un signal radio (705) à partir d'au moins une STA (101, 102, 110, 600), le signal radio (705) comprenant un code (712, 722, 732) et au moins une réplique du code (712, 722, 732).
PCT/EP2017/066021 2017-06-28 2017-06-28 Techniques de traitement de signaux radio comprenant un code et une réplique du code WO2019001702A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/066021 WO2019001702A1 (fr) 2017-06-28 2017-06-28 Techniques de traitement de signaux radio comprenant un code et une réplique du code

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/066021 WO2019001702A1 (fr) 2017-06-28 2017-06-28 Techniques de traitement de signaux radio comprenant un code et une réplique du code

Publications (1)

Publication Number Publication Date
WO2019001702A1 true WO2019001702A1 (fr) 2019-01-03

Family

ID=59276736

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/066021 WO2019001702A1 (fr) 2017-06-28 2017-06-28 Techniques de traitement de signaux radio comprenant un code et une réplique du code

Country Status (1)

Country Link
WO (1) WO2019001702A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11083048B2 (en) 2017-10-25 2021-08-03 Huawei Technologies Co., Ltd. Devices and methods for transforming user plane signaling from a remote sidelink control server into control plane signaling

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080095254A1 (en) * 2006-10-24 2008-04-24 Tarik Muharemovic Random Access Channel Design With Hybrid CDM And FDM Multiplexing Of Access
US20100254433A1 (en) * 2009-04-06 2010-10-07 Shahrnaz Azizi Techniques to format a symbol for transmission
EP2472966A2 (fr) * 2009-08-25 2012-07-04 Electronics and Telecommunications Research Institute Procédé de commande de synchronisation pour transmission/réception de données et station pour la synchronisation de transmission/réception de données
US20130177090A1 (en) * 2012-01-06 2013-07-11 Qualcomm Incorporated Systems and methods for wireless communication of long data units
WO2017074254A1 (fr) * 2015-10-30 2017-05-04 Telefonaktiebolaget Lm Ericsson (Publ) Accès aléatoire en deux étapes avec concurrence sur des ressources radio d'une laa

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080095254A1 (en) * 2006-10-24 2008-04-24 Tarik Muharemovic Random Access Channel Design With Hybrid CDM And FDM Multiplexing Of Access
US20100254433A1 (en) * 2009-04-06 2010-10-07 Shahrnaz Azizi Techniques to format a symbol for transmission
EP2472966A2 (fr) * 2009-08-25 2012-07-04 Electronics and Telecommunications Research Institute Procédé de commande de synchronisation pour transmission/réception de données et station pour la synchronisation de transmission/réception de données
US20130177090A1 (en) * 2012-01-06 2013-07-11 Qualcomm Incorporated Systems and methods for wireless communication of long data units
WO2017074254A1 (fr) * 2015-10-30 2017-05-04 Telefonaktiebolaget Lm Ericsson (Publ) Accès aléatoire en deux étapes avec concurrence sur des ressources radio d'une laa

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11083048B2 (en) 2017-10-25 2021-08-03 Huawei Technologies Co., Ltd. Devices and methods for transforming user plane signaling from a remote sidelink control server into control plane signaling

Similar Documents

Publication Publication Date Title
JP6148768B2 (ja) 基地局及びユーザ機器
US7558293B2 (en) Method for detecting initial operation mode in wireless communication system employing OFDMA scheme
CN107104768B (zh) 无线通信系统的动态时分双工数据信道传输方法和装置
US7859988B2 (en) System for flexible cyclic prefix length for preamble symbols in an OFDM based communication system
US9252862B2 (en) MIMO preamble for initial access with an unknown number of transmit antennas
US20060176966A1 (en) Variable cyclic prefix in mixed-mode wireless communication systems
AU2012274232A1 (en) Method and apparatus for transmitting and receiving time division duplex frame configuration information in wireless communication system
US10644853B2 (en) Transmission and reception devices processing composed pilot signals
RU2428806C2 (ru) Ортогонализация маяковых символов
KR20100046565A (ko) 무선 통신 시스템에서 순환 전치 길이 변경 방법 및 이를 위한 시스템
KR20090074105A (ko) 새로운 레인징 구조를 이용한 레인징 수행 방법
KR20080098282A (ko) 직교 주파수 분할 다중 접속 시스템에서의 데이터 송수신방법 및 장치
JP2011524142A (ja) 無線通信システムにおける方法および装置
US8548086B2 (en) Multiple receivers in an OFDM/OFDMA communication system
WO2016032611A1 (fr) Communication sans fil par l'intermédiaire d'une signalisation combinée d'en-tête de couche physique et d'apprentissage de canal
US11109330B2 (en) Method for determining correction time in wireless communication system and apparatus therefor
WO2019001702A1 (fr) Techniques de traitement de signaux radio comprenant un code et une réplique du code
US9172576B2 (en) Base station and method of adjusting reference timing on base station
WO2009084868A2 (fr) Procédé de transmission de données dans un système de communication sans fil
WO2019042779A1 (fr) Appareils et programmes d'ordinateur, procédés de nœud de réseau et dispositif sans fil permettant de fournir efficacement des informations
CA2767447A1 (fr) Procedes et appareils de communication sans fil
Pisal Physical Layer Comparative Study of WiMAX and LTE

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17735078

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17735078

Country of ref document: EP

Kind code of ref document: A1