CN107787013B

CN107787013B - Scheduling request transmission method, user equipment and base station

Info

Publication number: CN107787013B
Application number: CN201610799424.8A
Authority: CN
Inventors: 向铮铮; 庞继勇; 朱俊; 林英沛
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2021-10-01
Anticipated expiration: 2036-08-31
Also published as: WO2018040818A1; CN107787013A

Abstract

A scheduling request transmission method, user equipment and a base station are provided, and the method comprises the following steps: a base station generates Downlink Control Information (DCI), wherein the DCI carries a first field indicated by a Scheduling Request (SR), and the SR indication is used for scheduling at least one UE to send an SR to the base station; the base station transmits the DCI to the at least one UE to schedule the at least one UE to transmit the SR to the base station. By implementing the embodiment of the invention, the base station can simultaneously schedule a plurality of UE to send the scheduling request SR, thereby improving the efficiency of the UE for sending the SR.

Description

Scheduling request transmission method, user equipment and base station

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a scheduling request transmission method, a user equipment, and a base station.

Background

Mass Machine Type Communications (mtc) is one of typical scenarios supported by fifth-Generation mobile communication technology (5 th-Generation, 5G), and mtc mainly aims at applications of internet of things Type and can support communication of a large number of Machine types, including communication between people and machines and communication between machines.

In an mtc scenario, when a User Equipment (UE) needs to send Uplink data, the UE first sends a Scheduling Request (SR) to an evolved Node B (eNB) periodically on a Physical Uplink Control Channel (PUCCH), and the eNB allocates Uplink resources (SR resources) to the UE after receiving the SR for the User to perform Uplink data transmission. When a certain cell supports a large number of UEs reporting the SR, the SR transmission period configured by the eNB is very long or the eNB needs to configure a large number of PUCCH resources for the UEs to send the SR; in addition, when the system operates in the unlicensed frequency band, there is uncertainty as to whether the UE can access the channel due to the need to perform the LBT mechanism. Therefore, when a large number of UEs exist in the unlicensed frequency band, the existing SR transmission mode has low efficiency and is difficult to adapt to the mtc scenario in the unlicensed frequency band.

Disclosure of Invention

The embodiment of the invention discloses a scheduling request transmission method, user equipment and a base station, which can improve the efficiency of UE for sending SR.

The first aspect of the embodiments of the present invention discloses a scheduling request transmission method, including:

a base station generates Downlink Control Information (DCI), wherein the DCI carries a first field indicated by a Scheduling Request (SR), and the SR indication is used for scheduling at least one User Equipment (UE) to send an SR to the base station;

the base station transmits the DCI to the at least one UE to schedule the at least one UE to transmit the SR to the base station.

The method for scheduling the UE to send the SR by the base station is adopted, the base station can send the DCI to at least one UE, one or more UEs are scheduled to send the SR at one time, the base station can simultaneously schedule a plurality of UEs to send the SR, compared with the prior art that the UE actively sends the SR to the base station, the SR transmission cycle in an mMTC scene is shortened, and therefore the SR sending efficiency of the UE can be improved.

Optionally, in order to adapt to an application in an unlicensed frequency band scenario, before the base station sends the DCI to the at least one UE, the method further includes:

if the base station works under the unlicensed frequency band, the base station accesses a channel by listening first and then sending LBT (local binary transmission);

when the LBT is successful, the base station transmitting the DCI to the at least one UE includes:

the base station transmits the DCI to the at least one UE through the channel.

In an unlicensed frequency band, when a UE actively sends an SR to a base station in the prior art, each UE needs to periodically pass through an LBT contention channel, and the SR can be sent only after the contention channel succeeds.

Optionally, the DCI further carries a resource block allocation indication, where the resource block allocation indication is used to indicate a plurality of resource blocks allowing the at least one UE to transmit the SR, and the number of the plurality of resource blocks is less than or equal to the number of resource blocks required by the at least one UE to transmit the SR.

When the resource block allocation indication is used for indicating that the number of the plurality of resource blocks allowing the at least one UE to transmit the SR is less than the number of resource blocks required by the at least one UE to transmit the SR, since the UE does not need frequent communication in an mtc scenario, RB resources for transmitting the SR can be saved while the RB required by the at least one UE to transmit the SR is satisfied; when the resource block allocation indication is used for indicating that the number of the plurality of resource blocks allowing the at least one UE to transmit the SR is equal to the number of resource blocks required by all UEs in the at least one UE to transmit the SR, the base station may ensure that the at least one UE can be allocated to the resource blocks used for transmitting the SR, so that the success rate of the UE transmitting the SR may be improved.

Optionally, the DCI further carries an LBT type indication, where the LBT type indication is used to indicate whether the at least one UE needs to perform LBT before sending the SR and an LBT type when LBT needs to be performed.

The LBT type indication may satisfy data transmission of the UE in multiple scenarios, for example, if the load rate of the current network is low, the LBT type indication in the DCI issued by the base station is used to indicate that at least one UE does not need to perform LBT, so as to improve data transmission efficiency; if the load rate of the current network is higher, the LBT type indication in the DCI issued by the base station is used to indicate at least one UE to perform LBT, so as to ensure the data transmission quality.

Optionally, the DCI further carries a transmission time interval, TTI, type indication, where the TTI type indication is used to indicate a type of one or more TTIs included in a subframe in which the at least one UE transmits the SR.

According to the TTI type indication provided by the embodiment of the invention, when a plurality of TTIs exist in one subframe, the UE can perform LBT in each TTI when sending the SR, and the frequency of performing LBT by the UE is increased, so that the success probability of LBT can be improved.

Optionally, the DCI further includes a second field, where the second field is used to indicate a UE identity of the at least one UE.

The UE identity of each UE is different, and for each UE identity, it refers to a unique UE.

Optionally, the DCI further includes a second field, where the second field is used to indicate a group identity of at least one UE group, and the UE group includes the at least one UE.

A base station groups all UEs in a cell covered by the base station, for example, the UEs are divided into M (M is a positive integer) UE groups, and a group identifier is allocated to each UE group in the M UE groups, where the group identifiers of different UE groups are different; the base station configures grouping information for all the UE, wherein the grouping information comprises the corresponding relation between the UE and the group identification, the corresponding relation between the UE and the group identification comprises the corresponding relation between all the UE and the group identification of M UE groups, and each UE corresponds to one group identification; after the base station configures the grouping information, the base station may send the grouping information to all UEs through a high-level signaling, so that all UEs determine the group identifiers corresponding to all UEs according to the correspondence between the UEs in the grouping information and the group identifiers.

In an unlicensed frequency band, before a base station accesses a channel through LBT, in order to facilitate the base station to schedule UEs in a UE group to send an SR, the base station first groups all UEs, allocates a group identifier of the UE group to each UE, and notifies all UEs through a high-layer signaling. The idea of dividing the UE groups in the embodiment of the invention can facilitate the base station to dispatch the UE in one or more UE groups to send the SR at one time, and the base station can dispatch a plurality of UEs to send the scheduling request SR at the same time, thereby greatly improving the efficiency of the UE to send the SR.

A second aspect of the present invention discloses a scheduling request transmission method, including:

UE receives DCI sent by a base station, wherein the DCI carries a first field indicated by SR, and the SR indication is used for scheduling the UE to send SR to the base station;

and when the UE has uplink resources needing to be sent, the UE sends the SR to the base station according to the SR indication.

When a plurality of UEs need to send SRs, and when the plurality of UEs receive DCI for SR transmission and schedule the plurality of UEs, the plurality of UEs may send SRs on different time-frequency resources, and may simultaneously schedule one or more UEs to send scheduling requests SR, thereby improving the efficiency of the UEs to send SRs.

Optionally, the DCI further carries a resource block allocation indication, where the resource block allocation indication is used to indicate a plurality of resource blocks allowing the UE to send the SR, and the UE sending the SR to the base station according to the SR indication includes:

the UE randomly selects an available resource block from the plurality of resource blocks according to the resource block allocation indication;

and the UE sends the SR to the base station on the selected available resource block according to the SR indication.

In the mtc scenario, the UEs do not need frequent communication, and the RBs required by the UE that needs to send the SR in the at least one UE to send the SR can be met, so that the RBs required by the UE that needs to send the SR in the at least one UE to send the SR can be met, and the RB resources for sending the SR can be saved.

the UE selects a resource block corresponding to the UE from the plurality of resource blocks according to the resource block allocation indication and a preset corresponding relation between the UE and the resource blocks;

and the UE sends the SR to the base station on a resource block corresponding to the UE according to the SR indication.

When the UE in the cell covered by the base station needs to perform frequent uplink data transmission, the base station allocates resource blocks for transmitting the SR to all UEs in the at least one UE, and the base station can ensure that all UEs in the at least one UE can allocate the resource blocks for transmitting the SR, thereby improving the success rate of transmitting the SR by the UEs.

Optionally, the DCI further carries an LBT type indication, where the LBT type indication is used to indicate whether the UE needs to perform LBT before sending the SR and an LBT type when the UE needs to perform LBT, and before the UE sends the SR to the base station according to the SR indication, the method further includes:

the UE determines whether LBT needs to be executed and the LBT type when the LBT needs to be executed according to the LBT type indication;

if the LBT does not need to be executed, the UE executes the step of sending the SR to the base station according to the SR indication;

if the LBT needs to be executed, the UE performs the LBT according to the LBT type to access a channel;

when the LBT is successful, the UE accesses the channel, and the UE sends the SR to the base station according to the SR indication, wherein the SR comprises the following steps:

and the UE sends the SR to the base station through the channel according to the SR indication.

In the unlicensed frequency band, before the UE transmits the SR, the UE may determine whether it needs to perform LBT according to the LBT type indication in the DCI, and may perform the type of LBT. The base station may determine whether at least one scheduled UE performs LBT and the type of LBT according to a load condition of a current network of the UE, urgency of data transmission required, or other factors, which may satisfy data transmission of the UE in various scenarios.

Optionally, the method further comprises:

when the LBT fails, the UE abandons transmitting the SR; or,

the UE continues the LBT according to the LBT type to access the channel until the LBT is successful, the UE accesses the channel, and the UE sends the SR to the base station according to the SR indication comprises the following steps:

The LBT indication in the embodiments of the present invention may be applicable to different application scenarios. When the data to be transmitted by the UE is not urgent, if the LBT fails, the UE may give up sending the SR to wait for the next scheduling of the base station; when the data that the UE needs to transmit is urgent, if LBT fails, the UE continues to perform LBT until accessing the channel when LBT succeeds.

Optionally, the DCI further carries a transmission time interval TTI type indication, where the TTI type indication is used to indicate a type of one or more TTIs included in a subframe in which the UE transmits an SR, and performing LBT by the UE according to the LBT type to access a channel includes:

the UE LBT in at least one TTI included in the subframe according to the LBT type to access a channel; each TTI comprises a Channel Clear Assessment (CCA) time slot and an SR transmission time slot, wherein the CCA time slot is used for the UE to perform the LBT to access the channel, and the SR transmission time slot is used for the UE to perform SR transmission after the LBT is successful in the CCA time slot.

The embodiment of the invention can provide TTI type indication, in a 5G scene, TTI can be in various types, for example, 0.25 millisecond TTI, 0.5 millisecond TTI, 1 millisecond TTI and the like, when TTI is shorter, a subframe can have a plurality of TTIs, UE can continue to make LBT in the second TTI of the subframe after LBT failure in the first TTI of the subframe until the SR is sent after LBT succeeds, and as the UE can make LBT in each TTI, the probability of LBT success can be improved.

Optionally, the second field is used to indicate a group identity of at least one UE group when at least two UEs are allocated into the at least one UE group.

A third aspect of the embodiments of the present invention discloses a base station, including:

a generating unit, configured to generate DCI, where the DCI carries a first field indicated by a scheduling request SR, and the SR indication is used to schedule at least one UE to send an SR to the base station;

a sending unit, configured to send the DCI to the at least one UE to schedule the at least one UE to send the SR to the base station.

With reference to the third aspect of the present embodiment, in a first implementation manner of the third aspect of the present embodiment, the base station further includes:

a detecting unit, configured to access a channel by listen before transmit LBT when the base station operates in an unlicensed frequency band;

when the detecting unit detects that the LBT is successful, the sending unit sends the DCI to the at least one UE in a specific manner:

the transmitting unit transmits the DCI to the at least one UE through the channel.

The fourth aspect of the present invention discloses a UE, including:

a receiving unit, configured to receive DCI sent by a base station, where the DCI carries a first field indicated by an SR, and the SR indication is used to schedule the UE to send an SR to the base station;

and a sending unit, configured to send the SR to the base station according to the SR indication when the UE has uplink resources that need to be sent.

Optionally, the DCI further carries a resource block allocation indication, where the resource block allocation indication is used to indicate a plurality of resource blocks allowing the UE to transmit the SR, and the transmitting unit includes:

a first selection subunit, configured to randomly select an available resource block from the plurality of resource blocks according to the resource block allocation indication;

a first sending subunit, configured to send the SR to the base station on the selected available resource block according to the SR indication.

a second selection subunit, configured to select, according to the resource block allocation indication and a preset correspondence between the UE and the resource block, a resource block corresponding to the UE from the multiple resource blocks;

and a second sending subunit, configured to send the SR to the base station on a resource block corresponding to the UE according to the SR indication.

Optionally, the DCI further carries an LBT type indication, where the LBT type indication is used to indicate whether the UE needs to perform LBT before sending the SR and an LBT type when LBT needs to be performed, and the UE further includes:

a determining unit, configured to determine whether LBT needs to be performed and an LBT type when LBT needs to be performed according to the LBT type indication;

the sending unit is further configured to send the SR to the base station according to the SR instruction when the determining unit determines that LBT does not need to be performed;

a detecting unit, configured to perform LBT according to the LBT type to access a channel when the determining unit determines that LBT needs to be performed;

an accessing unit, configured to access the channel when the detecting unit detects that the LBT is successful;

the manner of sending the SR to the base station according to the SR indication by the sending unit is specifically:

and after the access unit accesses the channel, the sending unit sends the SR to the base station through the channel according to the SR indication.

Optionally, the UE further includes:

a discard transmission unit configured to discard transmission of the SR when the detection unit detects the LBT failure;

or,

the detecting unit is further configured to continue performing the LBT according to the LBT type to access the channel when the detecting unit fails to detect the LBT, until the LBT succeeds, trigger the accessing unit to access the channel;

Optionally, the DCI further carries a transmission time interval TTI type indication, where the TTI type indication is used to indicate a type of one or more TTIs included in a subframe in which the UE transmits the SR, and a manner in which the detecting unit performs LBT according to the LBT type to access the channel is specifically:

the detecting unit performs LBT in at least one TTI included in the subframe according to the LBT type to access a channel; each TTI comprises a Channel Clear Assessment (CCA) time slot and an SR transmission time slot, wherein the CCA time slot is used for the UE to perform the LBT to access the channel, and the SR transmission time slot is used for the UE to perform SR transmission after the LBT is successful in the CCA time slot.

The fifth aspect of the embodiment of the present invention discloses a base station, which includes a processor, a network interface, a memory, and a communication bus, wherein the processor, the network interface, and the memory are connected through the communication bus, and the memory is used for storing instructions and data; the processor is configured to execute instructions stored in the memory; the processor implements the scheduling request transmission method provided in any one of the possible implementations of the first aspect by executing the instructions.

The processor is configured to generate DCI, where the DCI carries a first field indicated by a scheduling request SR, and the SR indication is used to schedule at least one UE to send an SR to the base station;

the network interface is configured to transmit the DCI to the at least one UE to schedule the at least one UE to transmit the SR to the base station.

A sixth aspect of the present invention discloses a UE, including a processor, a network interface, a memory, and a communication bus, where the processor, the network interface, and the memory are connected via the communication bus, and the memory is used to store instructions and data; the processor is configured to execute instructions stored in the memory; the processor implements the scheduling request transmission method provided by any one of the possible implementation manners of the second aspect by executing the instructions.

The network interface is used for receiving DCI sent by a base station, the DCI carries a first field of SR indication, and the SR indication is used for scheduling the UE to send SR to the base station;

and the network interface is further configured to send the SR to the base station according to the SR indication when the UE has uplink resources that need to be sent, where the SR is an SR that the UE needs to send.

Each UE can judge whether the DCI is the DCI sent to the UE according to a second field which is carried in the DCI and indicates the UE identification of at least one UE, when a plurality of UEs need to send the SR, and when the plurality of UEs receive the DCI used for SR transmission and are used for scheduling the plurality of UEs, the plurality of UEs can send the SR on different time-frequency resources, and can simultaneously schedule one or more UEs to send scheduling requests SR, so that the efficiency of the UE for sending the SR can be improved.

In the embodiment of the invention, a base station generates downlink control information DCI, the DCI carries a first field indicated by a Scheduling Request (SR) and a second field used for indicating a User Equipment (UE) identifier of at least one UE, and the SR indication is used for scheduling the at least one UE to send the SR to the base station; the base station transmits the DCI to the at least one UE to schedule the at least one UE to transmit the SR to the base station. Compared with the prior art that the UE actively sends the SR to the base station, the base station can simultaneously schedule a plurality of UEs to send the scheduling request SR, thereby improving the efficiency of the UE for sending the SR.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a network architecture according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another network architecture disclosed in the embodiments of the present invention;

fig. 3 is a flowchart illustrating a scheduling request transmission method according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating a scheduling request transmission method according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating another scheduling request transmission method according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an LBT procedure disclosed in an embodiment of the present invention;

fig. 7 is a flowchart illustrating another scheduling request transmission method according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an LBT type according to an embodiment of the present invention;

FIG. 9 is a diagram of a subframe structure according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating another method for transmitting a scheduling request according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating another method for transmitting a scheduling request according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a UE according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of another base station disclosed in the embodiment of the present invention;

fig. 15 is a schematic structural diagram of another UE disclosed in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a scheduling request transmission method, user equipment and a base station, which can improve the efficiency of UE for sending SR. The following are detailed below.

For better understanding of the embodiments of the present invention, a network architecture to which the embodiments of the present invention are applicable will be described below.

Referring to fig. 1, fig. 1 is a schematic diagram of a network architecture according to an embodiment of the present invention. As shown in fig. 1, the network architecture includes a base station 10 and a plurality of user equipments UEs (such as 1001, 1002.. 100N in fig. 1), and the base station 10 is connected with each UE through a wireless network.

The base station 10 in the implementation of the present invention may schedule one or more UEs to send Scheduling requests (Scheduling requests, abbreviated as SRs) at a time, and allocate corresponding time-frequency resources to the one or more UEs to send the SRs. And after receiving the SR sent by the one or more UEs, the base station allocates uplink time-frequency resources for the one or more UEs so that the one or more UEs can carry out uplink data transmission.

Referring to fig. 2, fig. 2 is a schematic diagram of another network architecture according to an embodiment of the present invention. As shown in fig. 2, the network architecture includes a base station 10 and a plurality of UE groups (e.g. 201, 202,.. 20M in fig. 2), and the base station 10 is connected to UEs in each UE group through a wireless network.

Each UE group includes a plurality of UEs, for example, the UE group 201 in fig. 2 includes UE2011, UE2012, UE2013, UE2014, the UE group 202 includes UE2021, UE2022, UE2023, UE2024, UE2025, UE2026, and the UE group 20M includes UE20M1, UE20M2, UE20M3, UE20M4, and UE20M5, where M is a positive integer. The UEs in the cell covered by the base station 10 may be logically divided into a plurality of UE groups, each UE group may include at least one UE, and the number of UEs in each UE group may be the same or different. The base station 10 in the implementation of the present invention may schedule all UEs in one or more UE groups to transmit the scheduling request SR at one time.

In the network architectures of fig. 1 and 2, the UE may be a mobile device, such as a mobile phone, a portable computer, and the like having telecommunications capabilities, or a device having telecommunications capabilities but not being portable, such as a desktop computer, a set-top box, any hardware or software component that is engaged in a communication session, and so on. The base station 10 may be referred to as an evolved NodeB (eNB), and the eNB may be a station communicating with the UE and may also be referred to as a node B, an access point, and the like. Each eNB may provide communication coverage for a particular geographic area. The term "cell" may refer to such a particular geographic coverage area of an eNB and/or of an eNB subsystem serving that coverage area, depending on the context in which the term is used.

An eNB may provide communication coverage for a macro cell, a micro cell, a femto cell, and/or other types of cells. A macro cell typically covers a relatively large geographic area (e.g., a range with a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions with the network provider. Micro cells generally cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A femto cell also typically covers a relatively small geographic area (e.g., a home) and may provide restricted access by UEs having a association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs of users in the home, etc.) in addition to unrestricted access. The enbs of the macro cell may be referred to as macro enbs. An eNB for a microcell may be referred to as a pico eNB. And, an eNB of a femtocell may be referred to as a femto eNB or a home eNB.

Referring to fig. 3, fig. 3 is a flowchart illustrating a method for scheduling request transmission according to an embodiment of the present invention. The method shown in fig. 3 is applicable to the network architecture of fig. 1, and as shown in fig. 3, the scheduling request transmission method includes the following steps.

301, the base station generates downlink control information DCI, where the DCI carries a first field indicated by a scheduling request SR, and the SR indication is used to schedule at least one UE to send an SR to the base station.

The embodiment of the invention adopts a method for scheduling UE to send SR by a base station, when the base station needs to schedule the UE to send SR, the base station generates Downlink Control Information (DCI), the DCI carries a first field indicated by a scheduling request SR, and the SR indication is used for scheduling at least one UE to send SR to the base station. The first field is for SR indication, which may be represented by binary bits. For example, the length of the first field may be 1 bit or 2 bits, and the first field may be "SR request".

Optionally, in other embodiments, the DCI further includes a second field, where the second field is used to indicate a UE identity (UE identity) of at least one UE. The UE identity of each UE is different, that is, it refers to a unique UE for each UE identity. Illustratively, the length of the second field may be 16 bits or 8 bits, and the second field may be "UE-1, UE-2" for indicating the first UE and the second UE, respectively. It should be noted that, the aforementioned at least one UE scheduled by using the second field to carry the UE identity is an explicit transmission, and in other embodiments, the UE identity is not explicitly transmitted, but implicitly included in a Cyclic Redundancy Check (CRC) calculation, for example, the CRC Check code is scrambled according to the UE ID, so that the scrambled CRC implicitly includes the UE identity.

302, the base station transmits DCI to at least one UE to schedule the at least one UE to transmit an SR to the base station.

After the base station generates the downlink control information DCI, the base station transmits the DCI to at least one UE so as to schedule the at least one UE to transmit the SR to the base station. The method for the base station to send the DCI to the at least one UE may specifically be: the base station sends DCI to all UE in a cell covered by the base station in a broadcasting mode; or, the base station may also send DCI to all UEs in the cell covered by the base station in a multicast manner; or, the base station may also transmit the DCI to all UEs in the cell covered by the base station in a unicast manner.

Specifically, when the DCI sent by the base station schedules one UE at a time, the UE identifier in the second field carried by the DCI only includes one UE identifier, which indicates the scheduled UE; when the DCI sent by the base station schedules a plurality of UEs at a time, a second field carried by the DCI includes a plurality of UE identifiers, and the plurality of UE identifiers respectively indicate the scheduled plurality of UEs.

When the UE identifier is explicitly transmitted as described above, that is, the DCI includes the second field, after the UE receives the DCI sent by the base station, the UE may decode the DCI to obtain the first field and the second field in the DCI, and the UE determines whether the UE identifier of at least one UE carried in the second field exists in the UE identifiers of the UE, and if the UE identifier does not exist in the UE identifiers of the at least one UE, it indicates that the DCI is not used for scheduling the UE, and the UE discards the DCI; if the uplink data needs to be transmitted, the UE sends the SR to the base station according to the SR indication in the DCI, and the base station allocates the uplink resource to the UE after receiving the SR sent by the UE so that the UE performs uplink data transmission.

When the UE identifier performs implicit transmission as described above, after the UE completes CRC check, the UE identifier is obtained, and an SR is sent according to the received DCI when uplink data needs to be transmitted.

The base station may periodically transmit DCI to at least one UE, or may aperiodically transmit DCI to at least one UE. For example, when the UE in the cell covered by the base station needs to frequently send more important uplink data (e.g., in a period from 7 pm to 10 pm), the base station may periodically issue DCI to schedule at least one UE to send an SR to the base station, and may set the period for which the base station issues DCI to a smaller value; when the UE in the cell covered by the base station does not need to frequently transmit uplink data (for example, during a period from 1 to 6 am), the base station may issue DCI aperiodically to schedule at least one UE to transmit the SR to the base station, or the base station may issue DCI periodically to schedule at least one UE to transmit the SR to the base station, and set the period for the base station to issue DCI to a larger value.

In the prior art, a method that UE directly sends SR to a base station is adopted, when uplink data of the UE needs to be transmitted, the UE sends SR to the base station, and each UE periodically sends SR to the base station in turn. In an mtc scenario, due to the existence of a large number of UEs, the period for the UE to send the SR is long, resulting in low efficiency for the UE to send the SR.

By implementing the method shown in fig. 3, the base station is adopted to schedule the UEs to transmit the SRs, the base station may transmit the DCI to at least one UE, schedule one or more UEs to transmit the SRs at one time, and the base station may simultaneously schedule a plurality of UEs to transmit the scheduling requests SR, thereby improving the efficiency of the UEs to transmit the SRs.

Referring to fig. 4, fig. 4 is a flowchart illustrating a method for scheduling request transmission according to an embodiment of the present invention. The method shown in fig. 4 is applicable to the network architecture of fig. 2, and as shown in fig. 4, the scheduling request transmission method includes the following steps.

401, the base station generates DCI, where the DCI carries a first field indicated by an SR, and the SR indication is used to schedule a UE, which needs to send an SR, in at least one UE group to send an SR to the base station.

In the embodiment of the invention, the UE in the cell covered by the base station is divided into a plurality of UE groups, each UE group has a group identifier (UE group identity, UE group ID for short), and the group identifiers of the UE groups are different. Illustratively, for one UE, the UE has a unique UE identity; if the UE is assigned to a group, the UE may be assigned a group identity. The first field is for SR indication, which may be represented by binary bits. For example, the length of the first field may be 1 bit or 2 bits, and the first field may be "SR request".

Optionally, in other embodiments, the DCI further includes a second field, where the second field is used to indicate a group identity of at least one UE group. The group identity of each UE group is different, i.e. it refers to a unique UE group for each UE group identity. Illustratively, the length of the second field may be 16 bits or 8 bits, and the second field may be "UE group-1, UE group-2" for indicating the first UE group and the second UE group, respectively. It should be noted that, the aforementioned indicating, by using the second field to carry the group identifier of the at least one UE group, the UE in the at least one scheduled UE group is an explicit transmission, and in other embodiments, the group identifier of the UE group is not explicitly transmitted, but implicitly included in the CRC calculation for transmission, for example, the CRC check code is scrambled according to the UE group ID, so that the scrambled CRC implicitly includes the group identifier of the UE group.

When the group identifier in the second field carried by the DCI only includes the group identifier of one UE group, the SR indicates to schedule the UE in the one UE group that needs to send the SR to the base station; and when the group identifier in the second field carried by the DCI comprises the group identifiers of a plurality of UE groups, the SR indicates that the UE needing to send the SR in the plurality of UE groups is scheduled to send the SR to the base station.

402, the base station transmits DCI to at least one UE group to schedule one or more UEs in the at least one UE group to transmit an SR to the base station.

In the embodiment of the present invention, the base station may send DCI to all UEs in all UE groups in a cell covered by the base station in a broadcast, multicast, or unicast manner. When the DCI only carries the group identifier of one UE group, the base station schedules one UE group at a time, and the base station may poll all the UE groups in the cell covered by the base station, that is, schedule the UEs in each UE group to send an SR at a time. The base station may issue the DCI periodically to schedule the UE in the UE group to transmit the SR, or may issue the DCI aperiodically to schedule the UE in the UE group to transmit the SR.

By implementing the method shown in fig. 4, a base station is adopted to schedule UEs in UE groups to transmit SRs, the base station may transmit DCI to at least one UE group, schedule UEs in one or more UE groups to transmit SRs at one time, and the base station may schedule multiple UEs to transmit scheduling requests SR at the same time, thereby improving the efficiency of the UEs to transmit SRs.

Referring to fig. 5, fig. 5 is a flowchart illustrating another method for scheduling request transmission according to an embodiment of the present invention. The scheduling request transmission method shown in fig. 5 is applied to the unlicensed frequency band, and as shown in fig. 5, the scheduling request transmission method includes the following steps.

501, the base station generates downlink control information DCI, where the DCI carries a first field indicated by a scheduling request SR, and the SR indication is used to schedule at least one UE to send an SR to the base station.

Optionally, the DCI may be explicitly transmitted by the UE identity, for example, in the network architecture of fig. 1, the DCI may further include a second field, where the second field is used to indicate the UE identity of at least one UE; or implicitly transmit the UE identity through CRC, for example, scramble a CRC check code according to the UE ID, so that the scrambled CRC implicitly includes the UE identity. The specific implementation of step 501 in the embodiment of the present invention may refer to step 301 in fig. 3, which is not described again in the embodiment of the present invention.

502, if the base station operates in the unlicensed frequency band, the base station accesses the channel by listen before transmit LBT.

In the embodiment of the invention, when the base station and the UE work under the unauthorized frequency band, the base station accesses a channel through Listen Before Transmit (LBT), wherein the channel is a channel under the unauthorized frequency band. The core idea of LBT is: the base station and the UE need to listen to the channel before sending data, and can send data only when the channel is idle (LBT is successful).

Specifically, the base station and the UE need to listen to whether the channel is idle within a time interval (e.g. 34 microseconds) before sending data, and if the channel is idle all the time within the time interval, enter a random back-off (Backoff) stage, and in the Backoff stage, back-off is performed according to a randomly selected random number N (N is a positive integer), that is, back-off is performed within N time slots (slots), and if the channel is still idle within N slots, it indicates that LBT is successful, and data can be sent. Fig. 6 is a schematic diagram of an LBT procedure disclosed in the embodiment of the present invention, as shown in fig. 6. The time interval in fig. 6 is 34 microseconds (us), Slot is 9us, and random Backoff (Backoff) is the duration of N slots. Fig. 6 is only an LBT procedure provided in the embodiment of the present invention, and the base station may also adopt other LBT manners.

503, when LBT is successful, the base station transmits DCI to at least one UE through the above channel.

In the embodiment of the invention, when the base station successfully performs LBT, the channel is in an idle state, and the base station can dispatch at least one UE to send the SR by sending down the downlink control information DCI through the channel. The DCI carries a first field indicated by the SR, and the SR indication is used for scheduling at least one UE to send the SR to the base station.

When the base station fails LBT, step 502 may be continued.

In one embodiment, optionally, in the network architecture of fig. 2, the DCI further includes a second field, where the second field is used to indicate a group identity of at least one UE group, and the UE group includes at least one UE. The DCI may explicitly transmit the group identity of the UE group through the second field or implicitly transmit the group identity of the UE group through the CRC. When the at least two UEs are allocated to the at least one UE group, the DCI comprises a second field for indicating the group identification of the at least one UE group, and when the LBT is successful, the base station transmits the DCI to the at least one UE group through the channel so as to schedule the UEs in the at least one UE group to transmit the SR.

In the unlicensed frequency band, the base station needs to perform LBT for channel contention, and only when the LBT is successful, the base station may issue DCI to schedule at least one UE to transmit an SR. By implementing the method shown in fig. 5, in an mtc scenario in an unlicensed frequency band, after the base station succeeds in LBT, the base station may schedule one or more UEs to send an SR at one time by issuing DCI, and the base station may schedule multiple UEs to send scheduling requests SR at the same time, so that the efficiency of sending the SR by the UEs may be improved.

Referring to fig. 7, fig. 7 is a flowchart illustrating another method for scheduling request transmission according to an embodiment of the present invention. The method shown in fig. 7 is applicable to the network architecture of fig. 2, and as shown in fig. 7, the scheduling request transmission method includes the following steps.

701, a base station divides all UEs in a cell covered by the base station into M UE groups, and allocates a group identifier to each UE group in the M UE groups, where the group identifiers of different UE groups are different, and M is a positive integer.

In the embodiment of the present invention, a base station may group all UEs in a cell covered by the base station, assuming that there are N UEs in total, the base station divides the N UEs into M groups, and assigns a group identifier to each UE group, and the group identifiers of different UE groups are different, for example, the number of UEs in the ith UE group is N_iI is 0. ltoreq. M and satisfies

The group identifier of the ith UE group is U_i. The base station may divide UEs accessing the same Access Point (AP) into one UE group, or may divide UEs accessing the same Radio Head (RHH) of the base station into one UE group, where each UE group may include a plurality of UEs, and the base station may further divide UEs having similar geographic locations into one UE group according to the geographic locations of the UEs.

702, the base station configures grouping information for all UEs, where the grouping information includes a correspondence between the UEs and the group identifiers, the correspondence between the UEs and the group identifiers includes a correspondence between all the UEs and the group identifiers of M UE groups, and each UE in all the UEs corresponds to one group identifier.

In the embodiment of the present invention, it is assumed that there are N total UEs in a cell covered by a base station, and the base station allocates grouping information to the N UEs, where the grouping information includes a correspondence between the UEs and a group identifier, for example, a correspondence table between the UEs and the group identifier may refer to table 1, where table 1 is a correspondence table between the UEs and the group identifier disclosed in the embodiment of the present invention.

TABLE 1

As shown in table 1, there are N total UEs (e.g. UE-1, UE-2, UE-3, UE-4, UE-5, UE-3, and UE-N in table 1) in a cell covered by a base station, where the N UEs are divided into M UE groups, where UE-1, UE-2, and UE-3 are divided into a first UE group, and a group identifier of the first UE group is U₁UE-4 and UE-5 are grouped into a second UE group, the group identification of the second UE group is U₂UE-N is divided into Mth UE group, and the group identification of the Mth UE group is U_MAccording to the table of correspondence between the UEs and the group identifiers shown in table 1, each UE may correspond to one group identifier, and UE-1 corresponds to a group identifier U₁UE-2 corresponding group identification U₁UE-3 corresponding group identification U₁UE-4 corresponding group identification U₂UE-5 corresponding group identification U₂,., the UE-N corresponding group identification U_M. The group identifiers corresponding to the UEs in the same UE group are the same and are all the group identifiers of the UE group.

After the base station configures the grouping information, the base station may send the grouping information to all UEs through a high-level signaling, so that a target UE of all UEs determines a group identifier corresponding to the target UE according to a correspondence between the UE in the grouping information and the group identifier, where the target UE is any one of all UEs.

In the embodiment of the invention, the base station sends the grouping information to all the UEs within the coverage range of the base station through high-level signaling (for example, RRC signaling), and after the target UE receives the high-level signaling, the group identifier corresponding to the target UE is determined according to the corresponding relation between the UE in the grouping information and the group identifier, wherein the target UE is any one of all the UEs. The base station may notify all the UE grouping information, and notify the group identifier of the UE group corresponding to each UE.

After the base station sends the packet information to all UEs, if the base station needs to schedule the UEs to send SRs, step 703 to step 705 are performed.

703, the base station generates downlink control information DCI, where the DCI carries a first field indicated by a scheduling request SR and a second field used for indicating a UE group identifier of at least one UE group, and the SR indication is used for scheduling the at least one UE to send an SR to the base station.

If the base station is operating in the unlicensed band, the base station accesses the channel by listen before transmit LBT 704.

705, when LBT is successful, the base station transmits DCI to at least one UE through the above-mentioned channel.

The specific implementation of steps 703 to 705 in the embodiment of the present invention may refer to steps 501 to 503 in fig. 5, and the embodiment of the present invention is not described in detail.

In the embodiment of the invention, before a base station accesses a channel through LBT (local binary transmission) in an unlicensed frequency band, in order to facilitate the base station to schedule UE in a UE group to send an SR (scheduling request), the base station firstly groups all the UE, allocates a group identifier of the UE group to each UE and informs all the UE through a high-level signaling. By implementing the method shown in fig. 7, the idea of dividing the UE groups in the embodiment of the present invention may facilitate the base station to schedule the UEs in one or more UE groups to send the SR at one time, and the base station may schedule a plurality of UEs to send the scheduling request SR at the same time, thereby improving the efficiency of the UEs to send the SR.

Further, in an embodiment, the DCI also carries a resource block allocation indication, and in the network architecture of fig. 1, the resource block allocation indication is used to indicate a plurality of resource blocks allowing the at least one UE to transmit the SR, and the number of the plurality of resource blocks is less than or equal to the number of resource blocks required by the at least one UE to transmit the SR. In the network architecture of fig. 2, the resource block allocation indication indicates a plurality of resource blocks for allowing at least one UE group to transmit the SR, and the number of the plurality of resource blocks is less than or equal to the number of resource blocks required by all UEs in the at least one UE group to transmit the SR.

In the embodiment of the invention, the UE sends SR to require a Resource Block (RB for short), and in the Long Term Evolution (LTE), one RB is defined to occupy 0.5 millisecond in a time domain and 180Hz in a frequency domain. In 5G, RB may adopt the definition in LTE, or may adopt another definition.

For example, in the network architecture of fig. 1, if there are 100 UEs in a cell covered by the base station, each UE needs to occupy 2 RBs for transmitting an SR, and the base station schedules 10 UEs at a time. In an embodiment, when the base station transmits DCI to the 10 UEs, the resource block allocation indication carried in the DCI may indicate that the number of RBs allowing the 10 UEs to transmit the SR is 20, the base station allocates 20 RBs to the 10 UEs, and the base station may ensure that the 10 UEs can all allocate 2 RBs to transmit the SR. In another embodiment, when the base station transmits DCI to the 10 UEs, the resource block allocation indication carried in the DCI may indicate that the number of RBs allowing the 10 UEs to transmit the SR is 10, the base station allocates 10 RBs to the 10 UEs, and the base station may ensure that 5 UEs of the 10 UEs can allocate 2 RBs to transmit the SR. In the mtc scenario, the UEs do not need to communicate frequently, so the proportion of UEs that need to send the SR in a unit time to all UEs is not very high, and when the RBs allocated by the UE to 10 UEs for sending the SR is smaller than the RBs needed by all the 10 UEs for sending the SR, the RB resources for sending the SR can be saved.

In the network architecture of fig. 2, if there are 50 UEs in each UE group, each UE needs to occupy 2 RBs for transmitting an SR, and the base station schedules one UE group at a time. In an embodiment, when the base station issues DCI, the resource block allocation indication carried in the DCI may indicate that the number of RBs allowing the UE in the UE group to transmit the SR is 100, the base station allocates 100 RBs for one UE group, and the base station may ensure that all UEs in the UE group can be allocated to 2 RBs, and when one UE in the UE group needs to transmit the SR, may select 2 RBs from the 100 RBs indicated in the resource block allocation indication to perform SR transmission (for example, the UE may select 2 RBs corresponding to the UE from the 100 RBs to perform SR transmission according to a preset correspondence between the UE and the resource block). In another embodiment, when a base station issues DCI, a resource block allocation indication carried by the DCI may indicate that the number of RBs allowing UEs in a UE group to transmit an SR is 20, the base station allocates 20 RBs for one UE group, and the RBs allocated by the base station may allow 10 UEs in the UE group to transmit an SR.

Further, in an embodiment, the DCI also carries an LBT type indication, and in the network architecture of fig. 1, the LBT type indication is used to indicate whether at least one UE needs to perform LBT before transmitting the SR and an LBT type when LBT needs to be performed. In the network architecture of fig. 2, the LBT type indication is used to indicate whether a UE in at least one UE group that needs to send an SR needs to perform LBT before sending the SR and the LBT type when LBT needs to be performed.

In this embodiment, taking the network architecture of fig. 1 as an example, in an unlicensed frequency band, a base station may indicate, according to a load condition of a network, whether at least one UE performs LBT before sending an SR, and an LBT type when performing LBT, where the LBT type may include type 1 and type 2, for example, a 2-bit binary bit stream may indicate LBT, "00" indicates that LBT is not performed, "01" indicates that LBT of type 1 is performed, and "10" indicates LBT of type 2.

Fig. 8 is a schematic structural diagram of an LBT type disclosed in an embodiment of the present invention, and fig. 8 includes schematic diagrams of LBT of type 1 and LBT of type 2. For type 1 LBT, a wireless node (e.g., a base station, UE) may perform LBT in a CCA slot, which includes a time interval (e.g., 20 microseconds) and if the channel is busy in the time interval, LBT fails and needs to wait until the channel is idle before performing LBT again to access the channel; if the channel is idle for the time interval, LBT is successful and the wireless node may transmit data. For type 2 LBT, the wireless node may perform LBT in a CCA slot, where the CCA slot includes a period of time (e.g., 34 microseconds) and a random Backoff (Backoff) stage, and the wireless node first performs channel idle evaluation in the time interval, and if the channel is busy in the time interval, the LBT fails, and it needs to wait until the channel is idle and then perform LBT again to access the channel; if the channel is idle in the time interval, the wireless node enters a random Backoff (Backoff) stage, and in the Backoff stage, Backoff is performed according to a randomly selected random number N (N is a positive integer), that is, Backoff is performed in N time slots (slots), and if the channel is still idle in N slots, it indicates that LBT is successful, and data can be transmitted, where one Slot may be 9 microseconds.

The base station may indicate whether at least one UE performs LBT before transmitting the SR and an LBT type when performing LBT according to a load condition of a current network. For example, if the load rate of the current network is low, the LBT type indication in the DCI issued by the base station is used to indicate that at least one UE does not need to perform LBT, so as to improve the data transmission efficiency; if the load rate of the current network is higher, the LBT type indication in the DCI issued by the base station is used to indicate that at least one UE needs to perform LBT1 or LBT2 to ensure the data transmission quality.

The base station may further indicate whether at least one UE performs LBT before transmitting the SR, and an LBT type when performing LBT according to urgency of data that the UE needs to transmit. For example, if the data that the UE needs to transmit is very urgent, the LBT type in the DCI issued by the base station indicates that the UE does not need to perform LBT, which may improve the speed of the UE uploading the SR; if the data that the UE needs to transmit is not very urgent, the LBT type in the DCI sent by the base station indicates the UE to perform the LBT of type 1, and if the data that the UE needs to transmit is not very urgent but is very important (transmission quality needs to be guaranteed), the LBT type in the DCI sent by the base station indicates the UE to perform the LBT of type 2. The base station may also determine whether the UE needs to perform LBT before sending the SR and the type of performing LBT according to other factors, which is not limited in the embodiment of the present invention. By implementing the embodiment of the invention, the LBT type indication can meet the data transmission of the UE in various scenes.

Further, in an embodiment, the DCI also carries a transmission time interval, TTI, type indication, and in the network architecture of fig. 1, the TTI type indication is used to indicate a type of one or more TTIs included in a subframe in which at least one UE transmits an SR. In the network architecture of fig. 2, the TTI type indication indicates a type of one or more TTIs included in a subframe in which UEs in at least one UE group transmit an SR.

In the embodiment of the present invention, taking the network architecture of fig. 1 as an example, the Transmission Time Interval (TTI) type indicator is used to indicate a type of one or more TTIs included in a subframe in which at least one UE transmits an SR, and various TTI types may be defined in the embodiment of the present invention, for example, a TTI of 1 ms, a TTI of 0.5 ms, a TTI of 0.25 ms, and the like. The subframe in which the UE transmits the SR may include one TTI type or may include a plurality of TTI types. For example, as shown in fig. 9, fig. 9 is a schematic view of a subframe structure disclosed in the embodiment of the present invention, in fig. 9, a subframe i where a UE transmits an SR includes 4 TTIs (4 TTIs of 0.25 ms, which are TTI1, TTI2, TTI3, and TTI4), which are of the same type, and in each TTI, a CCA slot and an SR transmission slot may be included, where the CCA slot is used for the UE to perform LBT to access a channel, and the SR transmission slot is used for the UE to perform SR transmission after LBT succeeds in the CCA slot. The UE may perform LBT in a CCA slot of TTI1 in subframe i, if LBT succeeds, the UE transmits SR in an SR transmission slot of TTI1, if LBT fails, the UE may perform LBT in a CCA slot of TTI2, if LBT succeeds in the CCA slot of a certain TTI and accesses a channel, the UE transmits SR in the SR transmission slot of the TTI, and does not continue to perform LBT in other TTIs in subframe i, if the UE fails in LBT of the CCA slot of the 4 TTIs, the UE cannot transmit SR, and waits for next scheduling of the base station. According to the TTI type indication provided by the embodiment of the invention, when a plurality of TTIs exist in one subframe, LBT can be carried out in each TTI, so that the success probability of LBT can be improved.

Optionally, the DCI may also carry a Carrier indicator (english: Carrier indicator), a resource cluster indicator (english: Multi-cluster), a Padding indicator (english: Padding), and the like. The carrier indication is used for indicating whether cross-carrier scheduling is performed, the resource cluster indication is used for indicating whether 1 or 2 resource clusters are used for transmitting the SR by the UE, and the padding indication is used for indicating which data in the subframe where the DCI is located are padding data.

Referring to fig. 10, fig. 10 is a flowchart illustrating another method for scheduling request transmission according to an embodiment of the present invention. As shown in fig. 10, the scheduling request transmission method includes the following steps.

1001, the UE receives DCI sent by the base station, where the DCI carries a first field indicated by an SR, and the SR indication is used to schedule the UE to send an SR to the base station.

In the implementation of the present invention, taking the network architecture of fig. 1 as an example, when a base station needs to schedule UE to send SR, the base station issues DCI, and the DCI carries a first field indicated by SR. The first field is for SR indication, which may be represented by binary bits. For example, the length of the first field may be 1 bit or 2 bits, and the first field may be "SR request".

Optionally, in other embodiments, the DCI further includes a second field, where the second field is used to indicate UE identities of at least one UE, and the UE identity of each UE is different, that is, each UE identity refers to a unique UE. Illustratively, the length of the second field may be 16 bits or 8 bits, and the second field may be "UE-1, UE-2" for indicating the first UE and the second UE, respectively. It should be noted that, the aforementioned at least one UE scheduled by being indicated by carrying the UE identity through the second field is an explicit transmission, and in other embodiments, the UE identity is not explicitly transmitted, but implicitly included in the CRC calculation for transmission, for example, the CRC check code is scrambled according to the UE ID, so that the scrambled CRC implicitly includes the UE identity.

1002, when the UE has uplink resources that need to be transmitted, the UE transmits an SR to the base station according to the SR indication.

In the embodiment of the invention, when the UE has uplink resources needing to be sent, the UE sends the SR to the base station according to the SR indication; and when the UE does not have the uplink resource needing to be transmitted, the UE ignores the received DCI.

Optionally, the DCI further includes a second field for indicating a UE identity of at least one UE, and step 1003 may be further performed before step 1002 is performed.

1003, the UE determines whether the UE identity of the UE exists in the UE identities of at least one UE.

In the implementation of the present invention, after receiving DCI sent by a base station, a UE may decode the DCI, obtain a UE identifier of at least one UE carried in the DCI, and determine whether the UE identifier of the UE exists in the UE identifier of the at least one UE. If yes, determining that the DCI is sent to the UE, and executing step 1002; if not, determining that the DCI is not sent to the UE, and discarding the DCI.

By implementing the method shown in fig. 10, at least one UE may be scheduled to transmit an SR according to DCI transmitted by the base station, and the base station may be used to schedule the UE to transmit the SR.

Further, in an embodiment, the DCI also carries a resource block allocation indication, and in the network architecture of fig. 1, the resource block allocation indication is used to indicate a plurality of resource blocks allowing the UE to transmit the SR. In the network architecture of fig. 2, the resource block allocation indication is used to indicate a plurality of resource blocks allowing at least one UE group to transmit the SR, and the number of the plurality of resource blocks is less than the number of resource blocks required by all UEs in the at least one UE group to transmit the SR. In step 1002, the UE sending the SR to the base station according to the SR indication includes:

(11) the UE randomly selects an available resource block from a plurality of resource blocks according to the resource block allocation indication;

(12) and the UE sends the SR to the base station on the selected available resource block according to the SR indication.

In the embodiment of the present invention, the resource block allocation indication carried in the DCI is used to indicate that at least one UE sends multiple resource blocks, which are also referred to as RBs, where one RB occupies 0.5 ms in the time domain and 180Hz in the frequency domain. In 5G, RB may adopt the definition in LTE, or may adopt another definition.

For example, in the network architecture of fig. 1, if there are 100 UEs in a cell covered by the base station, each UE needs to occupy 2 RBs for transmitting an SR, and the base station schedules 10 UEs at a time. When the base station sends DCI to the 10 UEs, the resource block allocation indication carried in the DCI may indicate that the number of RBs allowing the 10 UEs to send SRs is 10, the base station allocates 10 RBs to the 10 UEs, and the base station may ensure that 5 UEs of the 10 UEs can allocate 2 RBs to send SRs. In the mtc scenario, since the UEs do not need frequent communication, the proportion of the UEs that need to send the SR in a unit time to all the UEs is not very high, and in the mtc scenario, step (11) and step (12) are performed, which can satisfy the RBs needed by the UEs that need to send the SR in 10 UEs to send the SR, and at the same time, can save RB resources for sending the SR.

In the network architecture of fig. 2, if there are 50 UEs in each UE group, each UE needs to occupy 2 RBs for transmitting an SR, and the base station schedules one UE group at a time. The resource block allocation indication carried by the DCI may indicate that the number of RBs allowing the UE in the UE group to transmit the SR is 20, the base station allocates 20 RBs for one UE group, the RBs allocated by the base station may allow 10 UEs in the UE group to transmit the SR, after the UE receives the DCI, the UE randomly selects 2 available RBs from the 20 RBs according to the resource block allocation indication carried in the DCI, and transmits the SR to the base station on the selected 2 available RBs. In the mtc scenario, UEs do not need frequent communication, so that the proportion of UEs that need to transmit an SR per unit time to all UEs is not high, and in order to save RB resources, only 20 RBs are allocated to each UE group for transmitting an SR, and in the mtc scenario, steps (11) and (12) are performed, which can satisfy the RBs required by UEs that need to transmit an SR in the UE group to transmit an SR, and can save RB resources for transmitting an SR.

Further, in another embodiment, the DCI also carries a resource block allocation indication, and in the network architecture of fig. 1, the resource block allocation indication is used to indicate a plurality of resource blocks allowing the UE to transmit the SR. In the network architecture of fig. 2, the resource block allocation indication is used to indicate a plurality of resource blocks allowing at least one UE group to transmit the SR, and the number of the plurality of resource blocks is equal to the number of resource blocks required by all UEs in the at least one UE group to transmit the SR. In step 1002, the UE sending the SR to the base station according to the SR indication includes:

(21) selecting a resource block corresponding to the UE from the plurality of resource blocks by the UE according to the resource block allocation indication and the preset corresponding relation between the UE and the resource blocks;

(22) and the UE sends the SR to the base station on the resource block corresponding to the UE according to the SR indication.

For example, in the network architecture of fig. 1, if there are 100 UEs in a cell covered by the base station, each UE needs to occupy 2 RBs for transmitting an SR, and the base station schedules 10 UEs at a time. When the base station sends DCI to the 10 UEs, the resource block allocation indication carried in the DCI may indicate that the number of RBs allowing the 10 UEs to send SRs is 20, the base station allocates 20 RBs to the 10 UEs, and the base station may ensure that the 10 UEs can all allocate 2 RBs to send SRs. By executing the step (21) and the step (22), it can be ensured that each UE in at least one UE can be allocated to a resource block to transmit the SR, and the success rate of transmitting the SR by the UE can be improved.

In the network architecture of fig. 2, if there are 50 UEs in each UE group, each UE needs to occupy 2 RBs for transmitting an SR, and the base station schedules one UE group at a time. When a base station issues DCI, a resource block allocation indication carried by the DCI can indicate that the number of RBs allowing UE in a UE group to send SR is 100, the base station allocates 100 RBs for one UE group, and can ensure that all UE in the UE group can be allocated to 2 RBs, and when one UE in the UE group needs to send SR, the UE selects 2 RBs corresponding to the UE from the 100 RBs according to the resource block allocation indication and a preset corresponding relation between the UE and the resource blocks. For example, the table of the correspondence between the UE and the resource block may refer to table 2, where table 2 is a table of the correspondence between the UE and the resource block disclosed in the embodiment of the present invention.

TABLE 2

An ith UE group has 50 UEs (such as UE-1, UE-2,. UE-50 in Table 2), each UE in the UE group is allocated with two 2 RBs, as shown in Table 2, the resource blocks corresponding to UE-1 are RB1 and RB2, the resource blocks corresponding to UE-2 are RB3 and RB4, the resource blocks corresponding to UE-3 are RB5 and RB6, the resource blocks corresponding to UE-4 are RB7 and RB8, the resource blocks corresponding to UE-5 are RB9 and RB10,. the resource blocks corresponding to UE-50 are RB99 and RB 100. The UE may select a resource block corresponding to the UE according to a preset correspondence between the UE and the resource block, and send an SR to the base station on the resource block corresponding to the UE. And (3) executing the step (21) and the step (22), so that each UE in the UE group can be ensured to be allocated to a resource block to transmit the SR, and the success rate of transmitting the SR by the UE in the UE group can be improved.

Referring to fig. 11, fig. 11 is a flowchart illustrating another method for scheduling request transmission according to an embodiment of the present invention. Applied to the unlicensed frequency band, as shown in fig. 11, the scheduling request transmission method includes the following steps.

1101, the UE receives DCI sent by a base station, where the DCI carries a first field indicated by an SR, a second field used for indicating a UE identity of at least one UE, a third field indicated by resource block allocation, and a fourth field indicated by an LBT type, where the SR indicates to schedule the at least one UE to send an SR to the base station, the resource block allocation indicates to allow the at least one UE to send multiple resource blocks of the SR, and the LBT type indicates to indicate whether at least one U needs to perform LBT before sending the SR and an LBT type when the LBT needs to be performed.

In this embodiment of the present invention, in an unlicensed frequency band, a base station may indicate whether at least one UE performs LBT before transmitting an SR, and an LBT type when performing LBT, where the LBT type may include type 1 and type 2, and the LBT type is identified by a fourth field, for example, LBT may be indicated by a 2-bit binary bit, "00" indicates that LBT is not performed, "01" indicates that LBT of type 1 is performed, and "10" indicates LBT of type 2.

The LBT types may include type 1 and type 2, and refer to the description of fig. 8 above, and the embodiment of the present invention is not described in detail.

When the LBT type in the DCI issued by the base station indicates that the UE does not need to execute the LBT, the speed of the UE for uploading the SR can be increased; when the LBT type in the DCI issued by the base station indicates the UE to execute the LBT of the type 1, the transmission quality of the SR uploaded by the UE is improved under the condition that the speed of the SR uploaded by the UE is ensured; when the LBT type in the DCI sent by the base station indicates the UE to perform the LBT of type 2, the transmission quality of the SR uploaded by the UE may be improved.

1102, the UE determines whether the UE identity of at least one UE exists.

1103, if there is an LBT type indication and the UE has uplink resources that need to be sent, the UE determines whether LBT needs to be performed and the LBT type when LBT needs to be performed according to the LBT type indication.

1104, if LBT does not need to be performed, the UE sends an SR to the base station according to the SR indication.

1105, if the LBT needs to be performed, the UE performs LBT according to the LBT type to access the channel.

In the embodiment of the present invention, for example, if the LBT type is indicated as a 2-bit binary bit stream, "00" indicates not to perform LBT, "01" indicates to perform LBT of type 1, and "10" indicates to perform LBT of type 2. When the LBT type indication is '00', the UE does not need to perform LBT, and the UE directly sends an SR to the base station; when the LBT type is indicated as "01", the UE performs LBT of type 1 according to the LBT type to access the channel; when the LBT type indication is '10', the UE performs LBT of type 2 according to the LBT type to access the channel.

1106, when LBT succeeds, the UE accesses the channel through which the UE transmits the SR to the base station according to the SR indication.

In the embodiment of the invention, when the UE succeeds in LBT (for example, LBT of type 1 or LBT of type 2), the UE accesses a channel which succeeds in LBT, and the UE sends the SR to the base station through the channel according to the SR indication.

Optionally, FIG. 11 may also include step 1107 as follows.

1107, when LBT fails, the UE gives up sending SR; or the UE continues to carry out LBT according to the LBT type to access the channel until the LBT is successful, the UE accesses the channel, and the UE sends the SR to the base station through the channel according to the SR indication.

In the embodiment of the present invention, when the LBT performed by the UE (for example, LBT of type 1 or LBT of type 2) fails, the UE may continue to perform LBT according to the LBT type to access the channel until the LBT succeeds (when the channel is in an idle state), the UE accesses the channel, and the UE sends the SR to the base station through the channel according to the SR indication. If the LBT of the type 1 of the UE fails, the UE continues to carry out the LBT of the type 1 to access the channel until the LBT succeeds, the UE accesses the channel, and the UE sends the SR to the base station through the channel. Or when the UE fails LBT, the UE gives up sending the SR, and the UE may wait for the next scheduling of the base station again. When the data to be transmitted by the UE is not urgent, if the LBT fails, the UE may give up sending the SR and wait for the next scheduling of the base station again; when the data that the UE needs to transmit is urgent, if LBT fails, the UE continues to perform LBT until accessing the channel when LBT succeeds. The LBT indication in the embodiments of the present invention may be applicable to different application scenarios.

Step 1003 in fig. 10 can be referred to for the detailed implementation of step 1102 in the embodiment of the present invention, and the embodiment of the present invention is not described in detail.

In the embodiment of the present invention, in an unlicensed frequency band, before the UE sends the SR, the UE may determine whether it needs to perform LBT according to an LBT type indication in the DCI, and determine whether to perform LBT and the type of performing LBT according to urgency of data transmission needs of the UE by implementing the method shown in fig. 11, so that data transmission of the UE in various scenarios may be satisfied.

Further, in an embodiment, the DCI further carries a transmission time interval TTI type indication, where the TTI type indication is used to indicate a type of one or more TTIs included in a subframe in which at least one UE transmits an SR, and performing LBT by the UE according to the LBT type to access the channel in step 1105 includes:

the UE performs LBT in at least one TTI included in the subframe according to the LBT type to access a channel; each TTI comprises a channel clear assessment CCA time slot and an SR transmission time slot, wherein the CCA time slot is used for the UE to carry out LBT to access a channel, and the SR transmission time slot is used for the UE to carry out SR transmission after the LBT is successful in the CCA time slot.

In the embodiment of the present invention, the Transmission Time Interval (TTI) type indicator is used to indicate a type of one or more TTIs included in a subframe in which at least one UE transmits an SR, and various TTI types may be defined in the embodiment of the present invention, for example, a TTI of 1 ms, a TTI of 0.5 ms, a TTI of 0.25 ms, and the like. The subframe in which the UE transmits the SR may include one TTI type or may include a plurality of TTI types. For example, as shown in fig. 9, a subframe i in which the UE transmits the SR includes 4 TTIs (4 TTIs of 0.25 ms, which are TTI1, TTI2, TTI3, and TTI4), which are of the same type, and in each TTI, the subframe i may include a CCA slot and an SR transmission slot, where the CCA slot is used for the UE to perform LBT to access the channel, and the SR transmission slot is used for the UE to perform SR transmission after the LBT is successful in the CCA slot. The UE may perform LBT in a CCA slot of TTI1 in subframe i, if LBT succeeds, the UE transmits SR in an SR transmission slot of TTI1, if LBT fails, the UE may perform LBT in a CCA slot of TTI2, if LBT succeeds in the CCA slot of a certain TTI and accesses a channel, the UE transmits SR in the SR transmission slot of the TTI, and does not continue to perform LBT in other TTIs in subframe i, if the UE fails in LBT of the CCA slot of the 4 TTIs, the UE cannot transmit SR, and waits for next scheduling of the base station. According to the TTI type indication provided by the embodiment of the invention, when a plurality of TTIs exist in one subframe, LBT can be carried out in each TTI, so that the success probability of LBT can be improved.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 12, the base station includes a generating unit 1201 and a transmitting unit 1202, where:

a generating unit 1201, configured to generate downlink control information DCI, where the DCI carries a first field indicated by a scheduling request SR, and the SR indication is used to schedule at least one UE to send an SR to a base station.

A transmitting unit 1202, configured to transmit DCI to at least one UE to schedule the at least one UE to transmit an SR to a base station.

With the base station shown in fig. 12, the base station may transmit DCI to at least one UE, and schedule one or more UEs to transmit SR at a time, and the base station may schedule multiple UEs to transmit scheduling requests SR at the same time, so that the efficiency of transmitting SR by the UEs may be improved.

For implementation of the base station, reference may be made to the method embodiments shown in fig. 3 to fig. 7, and repeated details are not repeated.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a UE according to an embodiment of the present invention, and as shown in fig. 13, the UE includes a receiving unit 1301 and a transmitting unit 1302, where:

a receiving unit 1301, configured to receive DCI sent by a base station, where the DCI carries a first field indicated by an SR, and the SR indication is used to schedule at least one UE to send an SR to the base station.

A sending unit 1302, configured to send an SR to the base station according to the SR instruction when the UE has an uplink resource that needs to be sent.

With the UE shown in fig. 13, the UE may transmit the SR according to the DCI transmitted by the base station, and use the base station to schedule at least one UE group to transmit the SR, and may simultaneously schedule one or more UEs to transmit the scheduling request SR, so as to improve the efficiency of the UE transmitting the SR.

The UE may refer to the method embodiments shown in fig. 10 to fig. 11, and repeated details are omitted.

Referring to fig. 14, fig. 14 is a schematic structural diagram of another base station disclosed in the embodiment of the present invention, as shown in fig. 14, the base station includes at least one processor 1401, for example, a CPU, at least one network interface 1402, a memory 1403, and at least one communication bus 1404, where the communication bus 1404 is used for implementing connection and communication between these components. The network Interface 1402 may be a wired Interface, such as a Fiber Distributed Data Interface (FDDI), Gigabit Ethernet (GE); the network interface 1402 may also be a wireless interface. Memory 1403 includes, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), erasable programmable read only memory (EPROM or flash memory), or portable read only memory (CD-ROM). The processor 1401 may be one or more Central Processing Units (CPUs), and in the case that the processor 1401 is one CPU, the CPU may be a single-core CPU or a multi-core CPU. Memory 1403 is used for storing instructions and data. The processor 1401 is configured to execute instructions stored in the memory 1403.

In the embodiment of the present invention, a processor 1401 is configured to generate DCI, where the DCI carries a first field indicated by a scheduling request SR, and the SR indication is used to schedule at least one UE to send an SR to a base station;

the network interface 1402 is used to transmit DCI to at least one UE to schedule the at least one UE to transmit an SR to a base station.

In one embodiment, processor 1401 is further configured to access a channel through listen before talk LBT when the base station operates in the unlicensed frequency band;

when LBT is successful, the method for the network interface 1402 to send DCI to at least one UE specifically includes:

the network interface 1402 transmits the DCI to at least one UE through a channel.

In one embodiment, the DCI further carries a resource block allocation indication, where the resource block allocation indication is used to indicate a plurality of resource blocks allowing the at least one UE to transmit the SR, and the number of the plurality of resource blocks is less than or equal to the number of resource blocks required by the at least one UE to transmit the SR.

In one embodiment, the DCI also carries an LBT type indication, where the LBT type indication is used to indicate whether at least one UE needs to perform LBT before transmitting the SR and an LBT type when LBT needs to be performed.

In one embodiment, the DCI further carries a transmission time interval, TTI, type indication, where the TTI type indication is used to indicate a type of one or more TTIs included in a subframe in which the at least one UE transmits the SR.

In one embodiment, the DCI further includes a second field for indicating a UE identity of the at least one UE.

In one embodiment, the DCI further includes a second field for indicating a group identity of at least one UE group, the UE group including at least one UE.

With the base station shown in fig. 14, the base station may transmit DCI to at least one UE, and schedule one or more UEs to transmit SR at a time, and the base station may schedule multiple UEs to transmit scheduling requests SR at the same time, so that the efficiency of transmitting SR by the UEs may be improved.

Referring to fig. 15, fig. 15 is a schematic structural diagram of another UE according to an embodiment of the present invention. Wherein, the UE shown in fig. 15 includes: at least one processor 1501, such as a CPU, at least one network interface 1502, memory 1503, and at least one communication bus 1504, wherein the communication bus 1504 is used to enable communications among the components. The network Interface 1502 may be a wired Interface, such as a Fiber Distributed Data Interface (FDDI), Gigabit Ethernet (GE); the network interface 1502 may also be a wireless interface. The memory 1503 includes, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), an erasable programmable read only memory (EPROM or flash memory), or a portable read only memory (CD-ROM). The processor 1501 may be one or more Central Processing Units (CPUs), and in the case that the processor 1501 is one CPU, the CPU may be a single-core CPU or a multi-core CPU. The memory 1503 is used to store instructions and data. The processor 1501 is configured to execute instructions stored in the memory 1503.

In the embodiment of the present invention, the network interface 1502 is configured to receive DCI sent by a base station, where the DCI carries a first field indicated by an SR, and the SR indication is used to schedule a UE to send an SR to the base station;

the network interface 1502 is further configured to send, according to the SR indication, an SR to the base station when the UE has uplink resources that need to be sent, where the SR is an SR that the UE needs to send.

In an embodiment, the DCI further carries a resource block allocation indication, where the resource block allocation indication is used to indicate a plurality of resource blocks allowing the UE to send an SR, the processor 1501 is configured to randomly select an available resource block from the plurality of resource blocks according to the resource block allocation indication, and the network interface 1502 sends the SR to the base station according to the SR indication, specifically:

the network interface 1502 transmits an SR to the base station on the selected available resource block according to the SR indication.

In an embodiment, the DCI further carries a resource block allocation indication, where the resource block allocation indication is used to indicate a plurality of resource blocks allowing the UE to send the SR, the processor 1501 is further configured to select a resource block corresponding to the UE from the plurality of resource blocks according to the resource block allocation indication and a preset correspondence between the UE and the resource block, and the network interface 1502 sends the SR to the base station according to the SR indication, specifically:

the network interface 1502 sends an SR to the base station on the resource block corresponding to the UE according to the SR indication.

In an embodiment, the DCI further carries an LBT type indication, where the LBT type indication is used to indicate whether the UE needs to perform LBT before sending the SR and an LBT type when the LBT needs to be performed, where the network interface 1502 is configured to determine whether the LBT needs to be performed and the LBT type when the LBT needs to be performed according to the LBT type indication before sending the SR to the base station;

the network interface 1502 is further configured to send an SR to the base station according to the SR indication when LBT does not need to be performed;

the processor 1501 is further configured to perform LBT according to the LBT type to access the channel when the LBT needs to be performed;

the processor 1501 is further configured to access a channel when the LBT is successful, and the network interface 1502 sends an SR to the base station according to the SR indication, specifically:

the network interface 1502 transmits the SR to the base station through a channel according to the SR indication.

In one embodiment, the network interface 1502 is configured to forgo sending the SR when the LBT fails; or, the processor 1501 is configured to continue performing LBT according to the LBT type to access the channel when the LBT fails, until the LBT succeeds, the channel is accessed, and the network interface 1502 sends an SR to the base station according to the SR indication, specifically:

In an embodiment, the DCI further carries a transmission time interval TTI type indication, where the TTI type indication is used to indicate a type of one or more TTIs included in a subframe where the UE transmits the SR, and the processor 1501 performs LBT according to the LBT type to access a channel, specifically:

processor 1501 performs LBT in at least one TTI included in a subframe according to an LBT type to access a channel; each TTI comprises a channel clear assessment CCA time slot and an SR transmission time slot, wherein the CCA time slot is used for the UE to carry out LBT to access a channel, and the SR transmission time slot is used for the UE to carry out SR transmission after the LBT is successful in the CCA time slot.

With the UE shown in fig. 15, the UE may transmit the SR according to the DCI transmitted by the base station, and the base station may schedule at least one UE to transmit the SR, and may simultaneously schedule one or more UEs to transmit the scheduling request SR, so that the efficiency of the UE to transmit the SR may be improved.

The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.

The units or sub-units in the terminal or the equipment of the embodiment of the invention can be merged, divided and deleted according to actual needs.

It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.

The scheduling request transmission method, the user equipment and the base station disclosed in the embodiments of the present invention are described in detail above, and a specific example is applied in the description to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for scheduling request transmission, comprising:

a base station generates Downlink Control Information (DCI), wherein the DCI carries a first field indicated by a Scheduling Request (SR), and the SR indication is used for scheduling at least one User Equipment (UE) to send an SR to the base station when uplink resources needing to be sent exist;

the base station sends the DCI to the at least one UE so as to schedule the at least one UE to send the SR to the base station when uplink resources needing to be sent exist;

and after receiving the SR sent by the UE, the base station allocates uplink resources for the UE so that the UE can carry out uplink data transmission.

2. The method of claim 1, wherein before the base station sends the DCI to the at least one UE, the method further comprises:

the base station transmits the DCI to the at least one UE through the channel.

3. The method of claim 1 or 2, wherein the DCI further carries a resource block allocation indication, wherein the resource block allocation indication indicates a number of resource blocks allowing the at least one UE to transmit the SR, and wherein the number of the resource blocks is smaller than or equal to a number of resource blocks required by the at least one UE to transmit the SR.

4. The method of claim 3, wherein the DCI further carries an LBT type indication indicating whether the at least one UE needs to perform LBT before transmitting the SR and an LBT type when LBT needs to be performed.

5. The method of claim 3, wherein the DCI further carries a Transmission Time Interval (TTI) type indication indicating a type of one or more TTIs included in a subframe in which the SR is transmitted by the at least one UE.

6. The method of claim 3, wherein the DCI further comprises a second field indicating a UE identity of the at least one UE.

7. The method of claim 3, wherein the DCI further comprises a second field indicating a group identity of at least one UE group, wherein the UE group comprises the at least one UE.

8. A method for scheduling request transmission, comprising:

the method comprises the steps that UE receives DCI sent by a base station, the DCI carries a first field indicated by SR, and the SR indication is used for scheduling the UE to send SR to the base station when uplink resources needing to be sent exist;

9. The method of claim 8, wherein the DCI further carries a resource block allocation indication, the resource block allocation indication indicating a plurality of resource blocks allowing the UE to transmit the SR, and wherein the UE transmitting the SR to the base station according to the SR indication comprises:

10. The method of claim 8, wherein the DCI further carries a resource block allocation indication, the resource block allocation indication indicating a plurality of resource blocks allowing the UE to transmit the SR, and wherein the UE transmitting the SR to the base station according to the SR indication comprises:

11. The method of any one of claims 8 to 10, wherein the DCI further carries an LBT type indication, wherein the LBT type indication is used to indicate whether the UE needs to perform LBT before transmitting the SR and an LBT type when LBT needs to be performed, and wherein before the UE transmits the SR to the base station according to the SR indication, the method further comprises:

12. The method of claim 11, wherein the DCI further carries a Transmission Time Interval (TTI) type indication, wherein the TTI type indication indicates a type of one or more TTIs included in a subframe in which the UE transmits the SR, and wherein performing LBT for the UE to access a channel according to the LBT type comprises:

13. A base station, comprising:

a generating unit, configured to generate DCI, where the DCI carries a first field indicated by a scheduling request SR, where the SR indication is used to schedule at least one UE to send an SR to a base station when there is an uplink resource that needs to be sent;

a sending unit, configured to send the DCI to the at least one UE, so as to schedule the at least one UE to send the SR to the base station when there is uplink resource that needs to be sent;

the sending unit is further configured to allocate uplink resources to the UE after receiving the SR sent by the UE, so that the UE performs uplink data transmission.

14. The base station of claim 13, wherein the base station further comprises:

15. The base station of claim 13 or 14, wherein the DCI further carries a resource block allocation indication, the resource block allocation indication indicating a number of resource blocks allowing the at least one UE to transmit the SR, and the number of the resource blocks is smaller than or equal to the number of resource blocks required by the at least one UE to transmit the SR.

16. The base station of claim 15, wherein the DCI further carries an LBT type indication, and wherein the LBT type indication is used to indicate whether the at least one UE needs to perform LBT before transmitting the SR and an LBT type when LBT needs to be performed.

17. The base station of claim 15, wherein the DCI further carries a Transmission Time Interval (TTI) type indication indicating a type of one or more TTIs included in a subframe in which the at least one UE transmits the SR.

18. The base station of claim 15, wherein the DCI further comprises a second field indicating a UE identity of the at least one UE.

19. The base station of claim 15, wherein the DCI further comprises a second field indicating a group identity of at least one UE group, the UE group comprising the at least one UE.

20. A UE, comprising:

a receiving unit, configured to receive DCI sent by a base station, where the DCI carries a first field indicated by an SR, and the SR indication is used to schedule the UE to send an SR to the base station when there is an uplink resource that needs to be sent;

21. The UE of claim 20, wherein the DCI further carries a resource block allocation indication indicating a plurality of resource blocks allowing the UE to transmit the SR, and wherein the transmitting unit comprises:

22. The UE of claim 20, wherein the DCI further carries a resource block allocation indication indicating a plurality of resource blocks allowing the UE to transmit the SR, and wherein the transmitting unit comprises:

23. The UE of any one of claims 20-22, wherein the DCI further carries an LBT type indication, wherein the LBT type indication is used to indicate whether the UE needs to perform LBT before transmitting the SR and an LBT type when LBT needs to be performed, and wherein the UE further comprises:

24. The UE of claim 23, wherein the DCI further carries a transmission time interval, TTI, type indication, where the TTI type indication is used to indicate a type of one or more TTIs included in a subframe in which the UE transmits an SR, and a manner for the detecting unit to perform LBT according to the LBT type to access a channel is specifically: