WO2020164599A1

WO2020164599A1 - Method for triggering buffer status report bsr and communication apparatus

Info

Publication number: WO2020164599A1
Application number: PCT/CN2020/075316
Authority: WO
Inventors: 卓义斌; 戴明增; 曹振臻; 朱元萍; 刘菁
Original assignee: 华为技术有限公司
Priority date: 2019-02-15
Filing date: 2020-02-14
Publication date: 2020-08-20
Also published as: CN111586751A; CN111586751B

Abstract

Provided in the present application are a method for triggering a BSR, a communication apparatus, and a computer-readable storage medium. The method comprises: a media access control (MAC) layer of a mobile terminal (MT) side of a first node receiving first indication information, the first indication information being used to indicate to trigger a first BSR, and the first BSR being used to report to a second node the amount of uplink data to be received by the first node; and the MAC layer of the MT on the first node triggering the first BSR according to the first indication information, wherein the first node is a relay node in a wireless relay system, and the second node is a parent node of the first node in the wireless relay system. The technical solution provided in the present application may apply in advance for uplink resources for uplink data that has not yet reached the first node, which may thus reduce the delay of uplink transmission in a wireless relay communication system.

Description

Method and communication device for triggering buffer status report BSR

This application claims the priority of a Chinese patent application filed on February 15, 2019 with the application number 201910118197.1 and the application title "A method for triggering a buffer status report BSR and a communication device", the entire content of which is incorporated into this application by reference in.

Technical field

This application relates to the field of communications, and more specifically, to a method for triggering a buffer status report BSR, a communication device, and a computer-readable storage medium.

Background technique

In long term evolution (LTE) and new radio (NR), after a terminal device establishes a connection with an access node (for example, a base station or a relay node), when the terminal device needs to send an uplink to the access node When data, there must be uplink resources. If there is no uplink resource, the terminal device needs to first apply for the uplink resource from the access node. In the process of a terminal device applying for an uplink resource from an access node, a buffer status report (BSR) needs to be reported to the access node so that the access node can schedule appropriate uplink resources for the terminal device.

In the scenario where a relay node (RN) is introduced between the terminal equipment and the base station, each relay node can schedule corresponding uplink resources for its child nodes, so that the child node can pass the local uplink data through The uplink resources are transmitted to the relay node. In addition, each relay node may also apply for uplink resources from its parent node, so that the parent node can schedule appropriate uplink resources for transmitting uplink data buffered in the relay node. If there are many relay nodes between the terminal device and the access node, the terminal device and each relay node need to perform the above steps, thereby increasing the delay of uplink transmission.

Therefore, how to reduce the delay of uplink transmission in the scenario of the relay node has become a problem that needs to be solved urgently.

Summary of the invention

This application provides a method for triggering a buffer status report BSR, a communication device, and a computer-readable storage medium, which can apply for uplink resources in advance for uplink data that has not yet reached the first node, thereby reducing uplink transmission in a wireless relay communication system Time delay.

In a first aspect, a method for triggering a BSR is provided, which includes: a media intervention control MAC layer on the MT side of a mobile terminal of a first node receives first indication information, where the first indication information is used to indicate that the first BSR is triggered; The first BSR is used to report the amount of uplink data to be received by the first node to the second node; the MAC layer of the MT on the first node triggers the second node according to the first indication information A BSR; wherein the first node is a relay node in a wireless relay system, and the second node is a parent node of the first node in the wireless relay system.

In a possible implementation manner, the MAC layer on the MT side of the first node receives the first indication information from an upper layer of the MAC layer on the MT side of the first node.

In another possible implementation manner, the upper layer of the MAC layer on the MT side of the first node is an adaptation layer on the MT side of the first node.

In another possible implementation manner, the MAC layer on the MT side of the first node receives the first indication information from the distributed unit DU side of the first node.

In another possible implementation manner, the first indication information includes an identifier of a bearer that triggers the first BSR, and the bearer is a radio link control RLC channel, or a logical channel, or a logical channel group.

In another possible implementation manner, the first indication information further includes: the corresponding bearer between the first node and the second node and the corresponding bearer of the uplink data to be received by the first node The amount of data, the bearer is a radio link control RLC channel, or a logical channel, or a logical channel group.

In another possible implementation manner, in the case that the first indication information further includes the amount of data carrying the corresponding uplink data to be received by the first node, the first indication information is also used to indicate triggering BSR or generate BSR.

It should be understood that generating the BSR may be determining the buffer size reported in the sent BSR.

In another possible implementation manner, the MAC layer on the MT side of the first node may trigger the BSR or generate the BSR according to the data volume of the uplink data to be received by the first node included in the first indication information.

When the MAC layer on the MT side of the first node triggers the BSR according to the amount of uplink data to be received by the first node. As an example, the MAC layer on the MT side of the first node may be based on one or more logical channels or RLC channels on the MT side of the first node indicated by the second indication information or uplink data and/or local uplink data to be received carried by the RLC. The data volume information of the buffered uplink data triggers the BSR. As another example, the MAC layer on the MT side of the first node may determine whether to trigger the BSR according to the threshold configured by the donor base station after receiving the second indication information indication. For example, when the amount of data or total data carried by a certain logical channel or RLC channel or RLC bearer indicated by the second indication information is greater than or equal to a threshold, the MAC layer on the MT side of the first node may trigger the BSR. For another example, when the amount of data or total data carried by a certain logical channel or RLC channel or RLC indicated by the second indication information is less than the threshold, the MAC layer on the MT side of the first node may not trigger the BSR.

In the case that the MAC layer of the MT side of the first node triggers the BSR according to the amount of data, the MAC layer of the MT side of the first node may also receive the first time information, which may be used to determine the time to send the BSR, In addition, the BSR can be sent when there are uplink resources for transmitting the BSR.

When the MAC layer on the MT side of the first node generates a BSR according to the amount of uplink data to be received by the first node. For example, the BSR can be generated according to the amount of data indicated in the second indication information, and the process of generating the BSR can also be understood as determining each logical channel or RLC channel or RLC bearer in the BSR sent by the MAC layer on the MT side of the first node. The buffer size reported in the logical channel group.

In the case that the MAC layer on the MT side of the first node generates the BSR according to the second indication information, before the MAC layer on the MT side of the first node generates the BSR according to the second indication information, the MAC layer on the MT side of the first node may Trigger the BSR.

In another possible implementation manner, the data volume of the uplink data to be received by the first node corresponding to the bearer further includes: the data volume of the uplink data to be received by the first node corresponding to the bearer is also It includes: ratio information, the ratio information being used to indicate the amount of uplink data to be received by the first node corresponding to the bearer, which is reported by the first node to the second node and the fourth node The proportion of the total amount of uplink data to be received by the first node, and the fourth node is the parent node of the first node.

In another possible implementation manner, the method further includes: when the amount of uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold, the MT of the first node The MAC layer on the side triggers the first BSR.

In another possible implementation manner, the first indication information further includes: first time information, and the first time information is used to indicate one or more of the following: MAC on the MT side of the first node The time at which the first BSR is triggered by the layer, or the time at which the MAC layer of the MT side of the first node sends the first BSR, the expected reception time of the uplink data to be received by the first node, the first A valid time of the indication information, the valid time after the first BSR is triggered.

In another possible implementation manner, in a case where the first indication information includes first time information, the first indication information is further used to indicate triggering of the BSR or used to indicate sending of the BSR.

In a possible implementation manner, when the first time information is used to indicate the time to trigger the BSR, the MAC layer on the MT side of the first node may trigger the BSR according to the first time information. This application does not specifically limit the specific implementation of determining the buffer size reported in each logical channel or RLC channel or RLC bearer or logical channel group in the sent BSR. As an example, the MT side of the first node may determine the buffer size in the sent BSR internally. As another example, the MAC layer on the MT side of the first node may also receive the second indication information, and may determine the buffer size in the sent BSR according to the amount of data indicated in the second indication information.

In the case where the first time information is used to indicate the time to send the BSR, the MAC layer on the MT side of the first node may send the BSR according to the third indication information.

The MAC layer on the MT side of the first node determines the time to send the BSR according to the first time information indicated in the first time information, and may send the BSR when there is an uplink resource for transmitting the BSR.

In the embodiment of the present application, before the MAC layer on the MT side of the first node sends the BSR according to the third indication information, the BSR may be triggered or generated. As an example, the MAC layer on the MT side of the first node may also receive the first indication information, and may trigger the BSR according to the first indication information.

In another possible implementation manner, the method further includes: the MAC layer on the MT side of the first node sends the first BSR to the second node, and the amount of data reported in the first BSR Is the data volume of the uplink data to be received by the first node corresponding to the bearer minus the first data volume, where the first data volume is the first data received from the MAC layer on the MT side of the first node A data amount of uplink data that reaches the first node after the indication information is started and before the first BSR is sent.

In another possible implementation manner, the MAC layer on the MT side of the first node maintains a first timer, and the method further includes:

When the first timer is not running or times out, the MAC layer on the MT side of the first node allows sending the first BSR to the second node; or,

When the MAC layer on the MT side of the first node sends the first BSR, start or restart the first timer; or,

When the MAC layer on the MT side of the first node does not have the first BSR to be sent or suspended, stop running the first timer.

In another possible implementation manner, the upper layer of the MAC layer on the MT side of the first node maintains a second timer, and the method further includes:

When the second timer is not running or times out, the upper layer of the MAC layer on the MT side of the first node allows sending the first indication information to the MAC layer; or

When the upper layer of the MAC layer on the MT side of the first node sends the first indication information to the MAC layer, start or restart the second timer.

In a second aspect, a method for generating a BSR is provided, which includes: a media intervention control MAC layer on the MT side of a mobile terminal of a first node receives first indication information, where the first indication information is used to indicate the first node and The bearer between the second nodes corresponds to the data volume of the uplink data to be received by the first node corresponding to the bearer, and the bearer is a radio link control RLC channel, or a logical channel, or a logical channel group; first The MAC layer on the MT side of the node generates the first BSR according to the data volume of the uplink data to be received by the first node corresponding to the bearer.

In a possible implementation manner, the data volume of the uplink data to be received by the first node corresponding to the bearer further includes: ratio information, where the ratio information is used to indicate the first node corresponding to the bearer The proportion of the data volume of the uplink data to be received in the total data volume of the uplink data to be received by the first node reported by the first node to the second node and the fourth node, the first node The four node is the parent node of the first node.

In another possible implementation, when the amount of uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold, the MAC layer on the MT side of the first node generates The first BSR.

In another possible implementation manner, the method further includes: the first indication information is also used to trigger a first BSR, and the first BSR is used to report to a second node the pending reception of the first node The amount of upstream data;

The MAC layer of the MT of the first node triggers the first BSR according to the first indication information.

In another possible implementation manner, the MAC layer on the MT side of the first node receives the first indication information from an upper layer of the MAC layer on the MT side of the first node.

In a third aspect, a communication device is provided, which can implement the BSR trigger method described in the first aspect or any one of the possible implementations, or can also be used to implement the second aspect or any one of the possible implementations. The BSR generation method described in the implementation mode. For example, the triggering device of the BSR may be the first node, or a chip set in the triggering of the BSR. The above method can be realized by software, hardware, or by hardware executing corresponding software.

It should be noted that the first node may be a relay node, or may also be an access network device.

In a fourth aspect, a communication device is provided, including:

The media intervention control MAC layer unit is configured to receive first indication information, where the first indication information is used to indicate the triggering of a first BSR, and the first BSR is used by the first node to report to the second node the information of the first node The data volume of the uplink data to be received, the MAC layer unit is located in the MT unit of the mobile terminal of the first node;

The MAC layer unit is further configured to trigger the first BSR according to the first indication information;

The first node is a relay node in a wireless relay system, and the second node is a parent node of the first node in the wireless relay system.

In a possible implementation manner, the device further includes: an upper layer unit of the MAC layer, configured to send the first indication information to the MAC layer unit, where the upper layer unit of the MAC layer is located at the first node MT unit.

In another possible implementation manner, the upper layer unit of the MAC layer is an adaptation layer unit.

In another possible implementation manner, the apparatus further includes: a distributed unit DU, configured to send the first indication information to the MAC layer unit.

In another possible implementation manner, the first indication information further includes data of the uplink data to be received by the first node corresponding to the bearer corresponding to the bearer between the first node and the second node The bearer is a radio link control RLC channel, or a logical channel, or a logical channel group.

In another possible implementation manner, the data volume of the uplink data to be received by the first node corresponding to the bearer further includes: ratio information, and the ratio information is used to indicate the first node corresponding to the bearer. The proportion of the data volume of the uplink data to be received by the node among the total data volume of the uplink data to be received by the first node reported by the first node to the second node and the fourth node, the The fourth node is the parent node of the first node.

In another possible implementation manner, the MAC layer unit is further configured to: when the amount of uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold, trigger the second One BSR.

In another possible implementation manner, the MAC layer unit is further configured to: send the first BSR to the second node, and the amount of data reported in the first BSR is the corresponding to the bearer The data amount of the uplink data to be received by the first node minus the first data amount, where the first data amount is from the time when the MAC layer unit receives the first indication information to before the first BSR is sent The data volume of the uplink data of the first node.

In another possible implementation manner, the MAC layer unit is further configured to: receive second indication information, where the second indication information is used to indicate the triggering of a second BSR, and the second BSR is used to notify the second node Reporting the amount of uplink data to be received by the first node;

The MAC layer unit is further configured to: trigger the second BSR according to the second indication information, and the time interval between the time when the second BSR is triggered and the time when the first BSR is triggered is greater than a first threshold.

In a fifth aspect, a communication device is provided, including: a memory, a processor,

Among them, the processor is connected to the memory. The memory can be used to store the program code and data of the terminal device. Therefore, the memory may be a storage unit inside the processor, or an external storage unit independent of the processor, or a component including a storage unit inside the processor and an external storage unit independent of the processor.

Optionally, the processor may be a general-purpose processor, which may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, integrated circuit, etc.; when implemented by software, the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory, and the memory may Integrated in the processor, can be located outside of the processor, and exist independently.

When the program is executed, the processor is configured to configure the media intervention control MAC layer unit to receive first indication information from the upper layer of the MAC layer unit. The first indication information is used to indicate that the first BSR is triggered. Reporting the data volume of the uplink data to be received by the first node to the second node at the first node, and the MAC layer unit is located in the mobile terminal MT unit of the first node;

The processor is further configured to configure the MAC layer unit to trigger the first BSR according to the first indication information;

In another possible implementation manner, the processor is configured to configure the distributed unit DU to send the first indication information to the MAC layer unit.

In another possible implementation manner, the processor is further configured to configure the MAC layer unit to trigger the transmission when the amount of uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold. The first BSR.

In another possible implementation manner, the communication device further includes a transceiver, configured to send the first BSR by a MAC layer unit, and the amount of data reported in the first BSR is the first BSR corresponding to the bearer The data volume of the uplink data to be received by a node minus the first data volume, where the first data volume is from the time when the MAC layer unit receives the first indication information to before the first BSR is sent. The data volume of the uplink data of the first node.

In a sixth aspect, a computer-readable storage medium is provided, including a computer program, which when the computer program runs, causes the communication device to execute the method described in the first aspect or any one of the first aspects, Or execute the method as described in the second aspect or any implementation manner of the second aspect.

In a seventh aspect, a computer program product is provided. When the computer program product runs on a computer, the computer executes the method described in the first aspect or any one of the first aspects, or executes the method described in the first aspect or the first aspect. The method described in the second aspect or any implementation of the second aspect.

Description of the drawings

FIG. 1 is a schematic diagram of a scene of a communication system 100 applicable to an embodiment of the present application.

FIG. 2 is a schematic block diagram of a possible wireless relay communication system 200 provided by an embodiment of the present application.

Fig. 3 is a schematic block diagram of a MAC CE format provided by an embodiment of the present application.

FIG. 4 is a schematic flowchart of a possible method for triggering a BSR according to an embodiment of the present application.

FIG. 5 is a schematic flowchart of another possible BSR triggering method provided by an embodiment of the present application.

FIG. 6 is a schematic flowchart of another possible method for triggering a BSR provided by an embodiment of the present application.

FIG. 7 is a schematic flowchart of a method for determining the data amount of uplink data to be transmitted according to an embodiment of the present application.

FIG. 8 is a schematic flowchart of another method for determining the data amount of uplink data to be transmitted according to an embodiment of the present application.

FIG. 9 is a schematic flowchart of a method for sending an SR according to an embodiment of the present application.

FIG. 10 is a schematic diagram of a possible RN sending a BSR according to an embodiment of the present application.

FIG. 11 is a schematic diagram of a possible RN sending a BSR according to an embodiment of the present application.

FIG. 12 is a schematic block diagram of a communication device 1200 according to an embodiment of the present application.

FIG. 13 is a schematic block diagram of a communication device 1300 according to an embodiment of the present application.

detailed description

The technical solution in this application will be described below in conjunction with the drawings.

Fig. 1 is an architecture diagram of a mobile communication system 100 applied to an embodiment of the present application. As shown in FIG. 1, the mobile communication system 100 includes at least one terminal device (for example, the terminal device 110 and the terminal device 120 in FIG. 1), a wireless backhaul device 130, an access network device 140, and a core network device 150.

The terminal device is connected to the wireless backhaul device 130 in a wireless manner, and one or more wireless backhaul devices 130 are connected to the access network device 140 in a wireless manner, which can be directly or indirectly connected to the connection device through other wireless backhaul devices. The network access device 140 is connected. The access network device 140 may be connected to the core network device 150 in a wireless manner, or may be connected to the core network device 150 in a wired manner.

The embodiment of this application does not specifically limit the mobile communication system 100, for example, it may be a global system of mobile communication (GSM) system, code division multiple access (CDMA) system, and broadband code division multiple access. (wideband code division multiple access, WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time Division Duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future fifth generation (5th generation, 5G) system or new radio (RN), etc.

In the embodiments of this application, the type of terminal equipment is not specifically limited. For example, it may be user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile Equipment, user terminal, wireless network equipment, user agent or user device. Terminals can include, but are not limited to, mobile stations (MS), mobile phones (mobile phones), user equipment (UE), mobile phones (handset), portable equipment (portable equipment), cellular phones, cordless phones, conversations Initiation protocol (session initiation protocol, SIP) telephone, wireless local loop (wireless local loop, WLL) station, personal digital processing (personal digital assistant, PDA), logistics use radio frequency identification (RFID) terminal equipment, Handheld devices with wireless communication functions, computing devices or other devices connected to wireless modems, in-vehicle devices, wearable devices, Internet of Things, terminal devices in vehicle networks, and terminal devices in future 5G networks or future evolution of public land mobile The terminal equipment in the network (public land mobile network, PLMN) network, etc.

As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as various smart bracelets and smart jewelry for physical sign monitoring.

The embodiment of the present application does not specifically limit the type of the access network device 140, and may be any device used to communicate with terminal devices. The access network device 140 may be, for example, a base transceiver station (BTS) in GSM or CDMA, a base station (NodeB, NB) in a WCDMA system, or an evolutional base station (evolutional Node) in an LTE system. B, eNB or eNodeB), may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, or the access network device 140 may be, for example, a relay station, an access point, a vehicle-mounted device, Wearable devices and network equipment in the future 5G network or network equipment in the future evolved PLMN network, etc.

As a possible way, since the future access network can be realized by cloud radio access network (C-RAN) architecture, one possible way is to use the protocol stack architecture of the traditional access network device 140 The sum function is divided into two parts, one part is called a central unit (CU), and the other part is called a distributed unit (DU). One CU can be connected to one DU, or multiple DUs can share one CU, which can save costs and facilitate network expansion. The segmentation of CU and DU can be segmented according to the protocol stack. One possible way is to combine radio resource control (RRC), service data mapping protocol stack (service data adaptation protocol, SDAP), and packet data aggregation protocol. The (packet data convergence protocol, PDCP) layer is deployed in the CU, and the remaining radio link control (RLC) layer, media access control (MAC) layer, and physical layer are deployed in the DU.

In addition, in the embodiment of the present application, the access network device 140 may provide services for the cell, and the terminal device communicates with the access network device 140 through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell. . The cell may be a cell corresponding to the access network device 140 (for example, a base station). The cell may belong to a macro base station or a base station corresponding to a small cell. The small cell here may include: Metro cell, Microcells, picocells, femtocells, etc., these small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.

The embodiment of the present application does not specifically limit the type of the core network device 150. As an example, in a 4G system, the core network device 150 may be an evolved packet core network (EPC), which includes a service gateway (serving gateway, S-GW) of a mobile terminal, and a mobility management entity (mobility management entity). management entity, MME) and other functional entities. As another example, in a 5G system, the core network device 150 may be a next generation core network (NGC), which includes a session management function (SMF) and access and liquidity management functions ( Access and mobility management function (AMF) and other functional entities provide functions such as authentication and mobility management for mobile terminals.

The core network device 150 and the access network device 140 may be separate and different physical devices, or the function of the core network device 150 and the logical function of the access network device 140 may be integrated on the same physical device, or one The physical equipment integrates part of the core network equipment 150 functions and part of the access network equipment 140 functions. The terminal device can be a fixed location or movable.

The embodiment of the present application does not limit the number of core network equipment 150, access network equipment 140, wireless backhaul equipment 130, and terminal equipment included in the mobile communication system 100.

The access network device 140 and terminal devices can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted. It can also be deployed on the water. It can also be deployed on aircraft, balloons and satellites in the air. The embodiment of the present application does not limit the application scenarios of the access network device 140 and the terminal device.

The communication between the access network device 140 and the terminal device and between the terminal device and the terminal device can be through the licensed spectrum (licensed spectrum), or through the unlicensed spectrum (unlicensed spectrum), or through the licensed spectrum and the free spectrum at the same time. Authorize spectrum for communication. The access network device 140 and the terminal device and between the terminal device and the terminal device can communicate through the frequency spectrum below 6 gigahertz (gigahertz, GHz), communicate through the frequency spectrum above 6 GHz, and can also use below 6 GHz at the same time Communicate with the frequency spectrum above 6GHz. The embodiment of the present application does not limit the spectrum resource used between the access network device 140 and the terminal device.

The wireless backhaul device 130 may be at least one integrated access and backhaul node (IAB node), and may also be referred to as a relay node (RN). The RN or IAB node may forward data and/or signaling between the terminal device and the access network device 140. The RN or IAB node can be a base station or a terminal device. For a specific description of the base station, please refer to the above description, which will not be repeated here.

The following describes in detail the process of forwarding data and signaling between the wireless backhaul device 130 as a terminal device and the access network device 140 in conjunction with a possible wireless relay communication system 200 in FIG. 2.

As shown in FIG. 2, in the wireless relay communication system 200, RN 210, RN 220, RN 230, RN 240, and RN 250 correspond to the wireless backhaul device 130 shown in FIG. 1, and RN may also be referred to as an IAB node. The access network device 140 can be used as a donor (donor) base station or referred to as an IAB host or a donor node, connected to the core network device 150, and provide a wireless access function for the RN.

The donor base station may be an access network element with a complete base station function, or it may be an access network element in the form of separated centralized unit (CU) and distributed unit (DU). The donor base station is connected to the core network device 150 serving the terminal device, and provides a wireless backhaul function for the RN. For ease of presentation, the centralized unit of the host node is abbreviated as donor CU, and the distributed unit of the host node is abbreviated as donor DU. The donor CU may also be the control plane (CP) and the user plane (UP). ) A separate form, for example, a CU can be composed of one CU-CP and one (or more) CU-UPs.

It should be understood that in a new radio (RN) system (or 5G system), the donor base station may be (donor gNodeB, DgNB), and in an LTE system (or 4G system), the donor base station may be (donor eNodeB) , DeNB). Of course, the donor base station can also be referred to as gNB or eNB for short.

In the wireless relay communication system 200, the link between the RN210, RN220 and the terminal device may be called an access link, the link between the RN and the RN and the link between the RN and the access network device 140 It can be called a backhaul link.

In the wireless relay communication system 200 shown in FIG. 2, the RN may support dual connectivity (DC) or multi-connectivity to deal with abnormal situations that may occur on the backhaul link. For example, abnormalities such as interruption or blockage of the return link and load fluctuations can improve the reliability of transmission. Therefore, there may be multiple transmission paths between the terminal device and the donor base station.

It should be understood that the RN supporting dual connectivity or multiple connectivity may be a wireless connection between one RN and two or more RNs. For example, the RN 220 can be wirelessly connected to the RN 230, and can also be wirelessly connected to the RN 240.

It should also be understood that there is a certain hierarchical relationship between the RN and the RN, and between the RN and the host node serving the RN on a path. Each RN regards the node providing the backhaul service as a parent node. Accordingly, each RN can be regarded as a child node of its parent node, and the parent node can schedule corresponding uplink resources for the child node.

For example, referring to Figure 2, the parent node of RN 250 is the access network device 140, RN 250 is the parent node of RN 230 and RN 240, RN 230 and RN 240 are both parent nodes of RN 220, and the parent node of RN 210 is RN 230.

The uplink data packet of the terminal device can be transmitted to the access network device 140 through multiple RNs, and then sent by the access network device 140 to the mobile gateway device (for example, the user plane function (UPF) in the 5G core network) ), the downlink data packet will be received by the access network device 140 from the mobile gateway device, and then sent to the terminal device through multiple RNs.

Taking the process in which the terminal device 110 transmits the uplink data packet to the access network device 140 as an example, there may be multiple specific transmission routes. The embodiments of the present application do not specifically limit this. As an example, the uplink data packet may be transmitted according to the route of the terminal device 110-RN210-RN 230-RN 250-access network device 140. As another example, the uplink data packet may also be transmitted according to the route of terminal device 110-RN 220-RN 230-RN 250-access network device 140. As another example, the uplink data packet may also be transmitted according to the route of the terminal device 110-RN 220-RN 240-RN 250-access network device 140.

During the uplink transmission process, the donor base station can centrally configure the available air interface resources. As a parent node, the RN can act as an access network device similar to a base station, and allocate uplink resources for transmitting uplink data to its child nodes through scheduling on the available air interface resources managed by the donor base station. As a child node, the RN can act as a terminal device for the parent node that provides services for it, access the wireless network like a terminal device, and perform the function of the terminal device. Through operations such as cell selection and random access, a connection is established with the parent node to obtain the uplink resources scheduled for the parent node for transmission of uplink data. As an example and not a limitation, the embodiment of the present application refers to the RN as the mobile terminal (MT) side of the RN or the MT function unit of the RN as the function of executing the terminal device, and the RN as the access network device similar to the base station is called DU side of RN or DU functional unit of RN.

In long term evolution (LTE) and new radio (NR), when a terminal device establishes a connection with an access node (for example, RN or a donor base station) and needs to send uplink data to the access node, the terminal device It is necessary to obtain an uplink grant (UL grant), and transmit uplink data on the uplink resource indicated by the UL grant. If there is no uplink resource, the terminal device can send a buffer status report (BSR) to the access node, so as to provide the access node with information about the amount of UL data to be transmitted on the terminal device, thereby providing the access node Apply for uplink resources for transmitting uplink data.

It should be noted that each access node independently schedules the uplink resources of the devices that access the access node. For example, the RN 210 in FIG. 2 can schedule appropriate uplink resources for the terminal device 110 to transmit uplink data. For another example, RN 250 may schedule appropriate uplink resources for RN 230 and RN 240 to transmit uplink data.

Specifically, taking the terminal device 110 sending uplink data to the RN 210 as an example, the terminal device 110 needs to send a buffer status report (BSR) to the RN 210. The BSR can carry the logic between the terminal device 110 and the RN 210 The amount of uplink data to be transmitted on a channel (logical channel, LCH) or logical channel group (logical channel group, LCG), so that the RN 210 can schedule appropriate uplink transmission resources for the terminal device 110 through the UL grant.

It should be understood that there may be a one-to-one correspondence between logical channels and RLC channels. The RLC channel can be understood as the channel between the RLC layer and the upper protocol layer. As an example, in the backhaul link between the RN and the RN, the upper layer protocol corresponding to the RLC is the adaptation layer, and the RLC channel refers to the channel between the adaptation layer and the RLC layer. In addition, the RLC channel may also be called an RLC bearer, which is not specifically limited in this application.

It should be noted that, in some embodiments, the RLC channel, the logical channel, and the RLC bearer can be equivalently replaced, which is not specifically limited in the embodiment of the present application.

Optionally, if the terminal device 110 triggers a regular (regular) BSR but there is no uplink resource to transmit the BSR, the terminal device 110 may send a scheduling request (SR) to the RN 210, so as to send a scheduling request (SR) to the RN 210. Request appropriate uplink resources to transmit BSR.

Similarly, after the RN 210 receives the uplink data transmitted by the terminal device 110, it can send a BSR to the parent node of the RN 210 (for example, the RN 230) by performing the above steps, so that the RN 230 can schedule appropriate uplink resources for the RN 210. This allows the RN 210 to transmit uplink data to the RN 230 through uplink resources.

In the wireless relay communication system 200 shown in FIG. 2, each terminal device or RN needs to apply for uplink resources for the uplink data buffered locally in each terminal device and RN through the above steps. If there are multiple relay nodes between the terminal device and the access network device 140, the terminal device and each relay node need to perform the above steps, thereby increasing the delay of uplink transmission.

The technical solution provided by the embodiments of this application can apply for uplink resources in advance for uplink data that has not arrived at the relay node, so that after the unreached uplink data is cached locally at the relay node, the relay node has already applied for the uplink data. To the uplink resources, the delay in the uplink transmission process can be reduced. The technical solutions provided by the embodiments of the present application will be described in detail below with reference to FIGS. 4 to 6.

It should be understood that the BSR that applies for uplink resources in advance for uplink data that has not yet reached the relay node involved in the embodiments of this application can be reported using the first BSR or the second BSR. The following is a description of the first BSR and the second BSR. Two BSR is described in detail.

It should be noted that, for ease of description, the first node is used for description below, the first node below is a relay node, and the child nodes of the first node may be a relay node or a terminal device. The parent node of the first node may be a relay node, or may also be a donor base station.

It should also be noted that the uplink data to be received by the first node in the embodiment of the present application can be understood as the uplink data that the first node will receive from one or more child nodes of the first node. The uplink data has not reached the first node. One node, so it is not cached by the first node. In the embodiments of the present application, the uplink data to be received may be referred to as unarrival uplink data, expected uplink data or uplink data to be transmitted.

The uplink data to be received by the first node may be any one or more of the following: the buffer size carried in the BSR reported by the child nodes of the first node to the first node, and multiple child nodes of the first node The sum of the buffer size carried in the reported BSR, the uplink data that can be transmitted on the uplink resource indicated by the UL grant scheduled by the first node as the child node of the first node, the first node and the child nodes of the first node The uplink data transmitted on semi-persistent scheduling (SPS) resources or grant-free resources in the uplink.

For example, suppose that at time t1, the amount of uplink data to be transmitted by the terminal device 110 is 15 bytes, and the terminal device 110 sends a BSR to the RN 210, and the BSR can apply for uplink resources for the amount of 15 bytes of data to be transmitted by the terminal device 110. The RN 210 may schedule an uplink resource capable of transmitting 10 bytes for the terminal device 110 according to the amount of data carried in the BSR. The terminal device 110 will send 10 bytes of data to the RN 210 during the next uplink data transmission. Therefore, the amount of uplink data to be received by the terminal device 110 may be 15 bytes carried in the BSR sent by the RN 210, or the amount of uplink data to be received by the terminal device 110 may be the uplink scheduled by the RN 210 for the terminal device 110 10 bytes that can be transmitted on the resource.

In the embodiments of the present application, the amount of data may be referred to as the data size, the amount of buffered data may be referred to as the buffer data size or the buffer size, and the data amount of the uplink data to be received may be referred to as the size of the uplink data to be received.

1. The first BSR

In the first BSR, the data volume of the uplink data to be received by the first node may be reported, or the data volume of the uplink data locally buffered in the first section may be reported.

The donor base station may configure the logical channel between the first node and the parent node of the first node for the first node, and specify the logical channel group to which each logical channel belongs. When the MAC layer on the MT side of the first node reports the BSR through MAC CE, it can use the logical channel group as the granularity to accumulate the amount of uplink data to be transmitted on multiple logical channels belonging to the same logical channel group for reporting .

Taking the format of MAC CE as a long BSR (or a long truncated BSR), the number of logical channel groups between the first node and the parent node of the first node is m (m is a positive integer greater than 1) as an example, The format of the MAC CE reported by the MAC layer on the MT side of a node is shown in Figure 3. Wherein LCG _{i is} used to indicate whether to report the buffer buffer size of LCG i in this MAC CE. When LCG _i is 1, it means that the buffer size of the LCG is reported, and when it is 0, it means that the buffer size of the LCG is not reported. Therefore, the MAC CE can report the amount of uplink data to be transmitted on one of m logical channel groups or on n logical channel groups, and n is less than or equal to m. For example, the buffer size 1 can be used to indicate the first one in LCG _i The data amount of uplink data to be transmitted on the logical channel group with a value of 1, and the buffer size 2 can be used to represent the data amount of uplink data to be transmitted on the second logical channel group with a value of 1 in the LCG _i .

It should be noted that the information used to indicate the amount of uplink data of a certain node involved in the embodiments of the application may be the amount of uplink data of a certain node, or may be an index associated with the amount of uplink data, or other content. The embodiment of the present application does not limit this. As shown in Table 1, Table 1 shows the relationship between the amount of data and the index:

Table 1 The relationship between the data volume index

Index

Data volume (unit: byte)

00	00
11	0～500～50
22	51～10051～100
33	101～150101～150
44	大于150Greater than 150

According to Table 1, when the index of the buffer size 1 in the BSR reported by the first node through MAC and CE is 3, the parent node of the first node can determine that the amount of uplink data to be transmitted on logical channel group 1 is 101 -150 bytes, so that according to the data volume of the uplink data to be transmitted in each logical channel group in the BSR, suitable uplink resources can be scheduled for the first node to transmit uplink data.

In the embodiment of the present application, the index associated with the uplink data volume can be carried in the BSR, which can reduce the signaling overhead.

For the m logical channel groups in the first BSR, in order to facilitate the parent node of the first node to schedule appropriate uplink resources for the uplink data to be transmitted in the m logical channel groups in the first BSR according to the priority level, Distinguish the data volume of the uplink data to be received by the first node reported in the m logical channel groups in the first BSR and the data volume of the uplink data locally buffered by the first node.

Specifically, the first node may report the amount of uplink data to be received by the first node through one or more of the m logical channel groups in the first BSR, and may use other logical channels in the m logical channel groups. The group reports the amount of uplink data locally cached by the first node.

In the embodiment of this application, how many ways are implemented to distinguish whether the data volume of the uplink data to be received by the first node or the data volume of the uplink data locally buffered by the first node reported in the m logical channel groups in the first BSR The embodiments of this application do not specifically limit this. As an example, it is possible to predefine which logical channel groups of the m logical channel groups on the MT side of the first node are used to report the amount of uplink data to be received by the first node, and which logical channel groups are used to report the first node The amount of uplink data cached locally by a node. As another example, the donor base station may configure which logical channel groups of the m logical channel groups on the MT side of the first node are used for reporting the amount of uplink data to be received by the first node, and which logical channel groups are used for reporting The amount of uplink data cached locally by the first node. For example, the donor base station may configure each logical channel group in the m logical channel groups on the MT side of the first node through RRC signaling. As another example, the donor base station may combine the second logical channel group by configuring the first logical channel associated with each logical channel, where the first logical channel group is used to report the locally buffered uplink data in the logical channel of the first node The second logical channel group is used to report the data volume of uplink data to be received in the logical channel of the first node.

It should be noted that if the first node corresponds to the terminal device shown in Figure 2, since the terminal device has no child nodes, the uplink data transmitted by the terminal device to its parent node only includes the uplink data buffered locally by the terminal device, and there is no waiting. Uplink data received from the child node. Therefore, it is not necessary to distinguish whether the BSR reported by the first node is the data volume of the uplink data to be received by the first node or the data volume of the uplink data locally buffered by the first node.

In the embodiment of the application, the MT side of the first node can map the amount of uplink data to be received from the child node of the first node on each logical channel between it and the parent node of the first node to the corresponding user Logical channel group for reporting the amount of uplink data to be received.

It should be understood that when only one logical channel group is pre-defined or the donor base station is configured to report the data volume of the uplink data to be received by the first node, the MT side of the first node may communicate with the parent node of the first node. The data volume of the uplink data to be received on each logical channel in between is all reported through the logical channel group. It is equivalent to that the first node reports the amount of uplink data to be received on all logical channels of the node through a logical channel group.

It should be noted that after receiving the first BSR reported by the first node, the parent node of the first node needs to distinguish which logical channel groups in the first BSR report the amount of uplink data to be received by the first node, and which The logical channel group reports the amount of uplink data locally buffered by the first node.

In the embodiment of the present application, the parent node of the first node can distinguish whether the first node is a terminal device or an RN. As an example, in a case where the first node is a terminal device, the parent node of the first node does not need to distinguish which logical channel groups in the first BSR report the amount of uplink data to be received by the first node. As another example, in the case where the first node is an RN, if it is a predefined logical channel group in the first BSR that reports the amount of uplink data to be received by the first node, the parent node of the first node may It is identified by the identification (ID) of a specific logical channel group. As another example, in the case where the first node is an RN, if the donor base station configures which logical channel groups in the first BSR report the amount of uplink data to be received by the first node, the donor base station also needs to report the amount of uplink data to be received by the first node. Configure the type of each logical channel group on the DU side of the parent node of a node. The configuration needs to be the same as the configuration method on the MT side of the first node, so that the parent node of the first node can distinguish the information reported by the first node Which logical channel groups in the first BSR report the amount of uplink data to be received by the first node.

2. The second BSR

The second BSR is a new BSR. All logical channel groups or logical channels in the BSR are used to report the data volume of the uplink data to be received by the first node, and to apply for uplink resources for the uplink data to be received.

Specifically, the donor base station may define one or more logical channel identifiers (logical channel identify, LCID), and the one or more LCIDs may be used for one or more MAC CEs corresponding to the second BSR format. In an example, the MAC CE corresponding to the second BSR can report the data volume of the uplink data of a node as the granularity, and provide all the uplink data of the node (including the locally cached uplink data and the subnodes to be received from the node). Uplink data received) apply for uplink resources. In another example, the MAC CE corresponding to the second BSR may also use logical channels or RLC channels as the granularity to apply for uplink resources for transmitting uplink data for each logical channel or RLC channel. In another example, the MAC CE corresponding to the second BSR may also use logical channel groups as the granularity to apply for uplink resources for transmitting uplink data for each logical channel group. For details, please refer to the format shown in Figure 3, which will not be repeated here.

Optionally, in some embodiments, since the MAC CE is newly introduced, it is necessary to define the priority order between the newly introduced MAC CE and other logical channels during uplink transmission. In the process of processing the priority of logical channels in uplink transmission, it is necessary to define the priority sequence between the newly introduced MAC CE and other logical channels during uplink transmission. As an example and not a limitation, the newly added MAC CE can be placed at a certain position in the existing logical channel priority order. For example, the priority of the newly added MAC CE can be predefined higher than the padding BSR. The priority of MAC CE is lower than the priority of MAC CE of other BSRs except paddingBSR. As another example, the priority of the newly added MAC CE may also be predefined lower than the MAC CE of the padding (padding) BSR.

It should be understood that, as an example and not a limitation, the other BSR may be a regular BSR, or may also be a periodic BSR.

It should be noted that, since the second BSR reports the data volume of the uplink data to be received by the first node, its advantage level may be lower than that of the BSR reporting the small amount of uplink data locally buffered by the first node. Therefore, the second BSR The BSR may request the uplink resource for transmitting the second BSR without triggering the SR, thereby saving signaling overhead. Alternatively, the priority of the second BSR may be higher than the BSR that reports the data volume of the uplink data buffered locally by the first node, thereby defining that the second BSR can be used to trigger the SR to request uplink resources for transmitting the second BSR. The flow control and congestion avoidance for downlink transmission are not limited in the embodiment of the present application.

In the embodiment of this application, the first BSR or the second BSR is used to report the amount of uplink data to be received by the first node, so that uplink resources can be applied in advance for uplink data that has not yet reached the first node, thereby reducing wireless Follow the time delay of the uplink transmission in the communication system.

FIG. 4 is a schematic flowchart of a possible method for triggering a BSR according to an embodiment of the present application. The method shown in FIG. 4 may include steps 410-420, and steps 410-420 will be described in detail below.

Step 410: The MAC layer on the MT side of the first node receives the first indication information.

It should be understood that the first node may correspond to any one of the RNs shown in FIG. 2.

In the implementation of this application, the first node may include the MT side and the DU side. The upper layer of the MAC layer on the MT side of the first node may send the first indication information to the MAC on the MT side of the first node, or it may be the DU of the first node. The side sends the first indication information to the MAC on the MT side of the first node, which is not specifically limited in this application. The first indication information in the embodiment of the present application may be used to instruct the MAC layer of the MT side of the first node to trigger a BSR, which is used to request uplink resources from the parent node of the first node for uplink data to be received by the first node .

Optionally, when the MAC layer on the MT side of the first node receives the first indication information, the MAC layer triggers the first BSR.

After receiving the first indication information, the first node may determine the amount of uplink data to be received carried in the BSR sent by the first node to the parent node of the first node, so that the parent node of the first node can follow the BSR The amount of data in is scheduling appropriate uplink resources for the first node.

In the embodiments of this application, there are many ways to determine the buffer size carried in the BSR sent to the parent node of the first node. As an example, the upper layer of the MAC layer on the MT side of the first node is based on the first node and the first node. The mapping relationship between the bearer between the child nodes of the node and the first node and the parent node of the first node determines the buffer size carried in the BSR sent to the parent node of the first node. As another example, the DU side of the first node may also determine the buffer size carried in the BSR sent to the parent node of the first node.

It should be understood that the upper layer of the MAC layer may be an adaptation layer or other layers with the above-mentioned functions, for example, a radio link control (RLC) layer.

Optionally, in some embodiments, the first indication information may also include the identification (identification, ID) of the logical channel or logical channel group or RLC channel of the triggered BSR, and the difference between the first node and the parent node. A certain logical channel (or logical channel group or RLC channel) of two logical channels (or logical channel group or RLC channel) can trigger the BSR. At this time, it can be understood as the logical channel (or logical channel group or RLC channel) and BSR association.

Optionally, in some embodiments, the first node may determine whether the first node is connected to the logical channel or logical channel group or the RLC channel identifier of the BSR triggered or sent. Whether the amount of uplink data carried by a certain logical channel (or logical channel group or RLC channel) between parent nodes is greater than or equal to the threshold. For example, the BSR may be triggered when the amount of uplink data carried by a certain logical channel (or logical channel group or RLC channel) between the first node and the parent node is greater than or equal to a threshold.

Step 420: The MAC layer on the MT side of the first node triggers the BSR according to the first indication information.

The MAC layer on the MT side of the first node may trigger the BSR according to the first indication information, and report the BSR through a MAC control unit (MAC CE).

It should be noted that if the first indication information includes the identifier of the logical channel or logical channel group or RLC channel associated with the triggered or sent BSR, the BSR triggered by the MAC layer on the MT side of the first node and the logical Channel or logical channel group or RLC channel identification; if the first indication information does not include the triggered or sent BSR associated logical channel or logical channel group or RLC channel identification, the MAC layer considers it to trigger or send The logical channel or logical channel group or RLC channel associated with the BSR is any of the following:

The highest priority logical channel or logical channel group or RLC channel in the data to be received;

Or the logical channel or logical channel group or RLC channel with the highest priority among all logical channels or logical channel groups or RLC channels;

Or the lowest priority logical channel or logical channel group or RLC channel in the data to be received;

Or the lowest priority logical channel or logical channel group or RLC channel among all logical channels or logical channel groups or RLC channels.

Specifically, if there is an uplink resource for transmitting the BSR at the moment when the BSR is triggered, the first node may report the BSR through the MAC CE on the uplink resource. If the BSR uplink resource is not transmitted at the moment when the BSR is triggered, the first node may suspend the triggered BSR, wait for the uplink resource to be applied, and report the BSR on the uplink resource through the MAC CE.

Optionally, after the MAC layer on the MT side of the first node triggers the BSR, the BSR may be sent to the parent node of the first node.

It should be understood that the BSR triggered or sent by applying for uplink resources for the uplink data to be transmitted that has not yet reached the first node may be the first BSR described above, or the second BSR described above. This embodiment of the application There is no specific restriction on this.

Optionally, in some embodiments, the MAC layer on the MT side of the first node may also receive second indication information, which may be used to indicate one or more logical channels on the MT side of the first node Or the data volume information of uplink data to be received and/or locally buffered uplink data carried on the RLC channel. The MAC layer on the MT side of the first node may generate the buffer size reported in each logical channel or logical channel group in the triggered or sent BSR according to the second indication information.

It should be understood that the MAC layer on the MT side of the first node generates the buffer size reported in each logical channel or logical channel group in the BSR according to the second indication information, which can also be understood as determining each logical channel or logical channel in the BSR to be triggered or sent. The buffer size reported in the channel group.

Optionally, in some embodiments, the MAC layer on the MT side of the first node may also receive third indication information, where the third indication information is used to indicate the first time information. The first time information can be used to indicate the time when the MAC layer on the MT side of the first node triggers the BSR or the time when the BSR is sent when there are uplink resources for transmitting the BSR, so that the MAC layer on the MT side of the first node can be based on The third indication information triggers or sends the BSR.

Specifically, the first time information may be used to indicate the estimated arrival time of the uplink data to be received by the first node indicated by the first indication information or the second indication information, or it may also be used to indicate the MAC layer of the first node on the MT side. The effective time of the BSR triggered by the first indication information or the second indication information, or it is also used to indicate the time offset value of the MAC layer on the MT side of the first node from receiving the first indication information or the second indication information to triggering the BSR , Or it is also used to indicate that the MAC layer of the MT side of the first node can trigger or send BSR after the first time information, or it is also used to indicate that the MAC layer of the MT side of the first node can cancel the triggering after the first time information BSR.

It should be understood that the MAC layer on the MT side of the first node may determine the time to trigger or send the BSR according to the estimated arrival time of the uplink data to be received by the first node indicated by the first time information. In order to avoid the problem of resource waiting caused by triggering BSR too early or too late, or the problem of uplink transmission delay caused by not waiting for uplink resources.

It should be understood that the above two embodiments can be implemented in combination. That is, in the method shown in FIG. 4, the MAC layer on the MT side of the first node may receive the first indication information, and may also receive the second indication information and/or the third indication information.

FIG. 5 is a schematic flowchart of another possible method for triggering a BSR provided by an embodiment of the present application. The method described in FIG. 5 may include steps 510-520, and steps 510-520 will be described in detail below.

Step 510: The MAC layer on the MT side of the first node receives the second indication information.

The second indication information in the embodiment of the present application may be used to indicate the amount of uplink data to be received and/or locally buffered uplink data carried by one or more logical channels or RLC channels on the MT side of the first node or RLC. information. The second indication information can be sent by the upper layer of the MAC layer on the MT side of the first node to the MAC layer on the MT side of the first node, or sent by the DU side of the first node to the MAC layer on the MT side of the first node , This application does not make specific restrictions on this.

Step 520: The MAC layer on the MT side of the first node triggers a BSR or generates a BSR according to the second indication information.

In the embodiment of the present application, the MAC layer on the MT side of the first node may trigger the BSR according to the second indication information, or may also generate the BSR, or may also send the BSR. The specific implementation methods of several situations are described in detail below.

The first case: the MAC layer on the MT side of the first node triggers the BSR according to the second indication information.

In the embodiment of the present application, there are multiple implementation manners for triggering the BSR by the MAC layer on the MT side of the first node according to the second indication information. As an example, the MAC layer on the MT side of the first node may be based on one or more logical channels or RLC channels on the MT side of the first node indicated by the second indication information or uplink data and/or local uplink data to be received carried by the RLC. The data volume information of the buffered uplink data triggers the BSR. As another example, the MAC layer on the MT side of the first node may determine whether to trigger the BSR according to the threshold configured by the donor base station after receiving the second indication information indication. For example, when the amount of data or total data carried by a certain logical channel or RLC channel or RLC bearer indicated by the second indication information is greater than or equal to a threshold, the MAC layer on the MT side of the first node may trigger the BSR. For another example, when the amount of data or total data carried by a certain logical channel or RLC channel or RLC indicated by the second indication information is less than the threshold, the MAC layer on the MT side of the first node may not trigger the BSR.

In the case that the MAC layer of the MT side of the first node triggers the BSR according to the second indication information, the MAC layer of the MT side of the first node may also receive the third indication information, and the first time information indicated by the third indication information may It is used to determine the time to send the BSR, and can send the BSR when there are uplink resources for transmitting the BSR.

The second case: the MAC layer on the MT side of the first node generates the BSR according to the second indication information.

In the embodiment of the present application, the MAC layer on the MT side of the first node may generate the BSR according to the second indication information. For example, the BSR can be generated according to the amount of data indicated in the second indication information, and the process of generating the BSR can also be understood as determining each logical channel or RLC channel or RLC bearer in the BSR sent by the MAC layer on the MT side of the first node. The buffer size reported in the logical channel group.

The embodiments of the present application do not specifically limit the above trigger conditions. As an example, the trigger condition may be that the MAC layer on the MT side of the first node receives the first indication information. For example, the MAC layer on the MT side of the first node may also receive first indication information, the first indication information indicating that the MAC layer on the MT side of the first node triggers the BSR. The MAC layer on the MT side of the first node may trigger the BSR according to the received first indication information. For the content of the first indication information, reference may be made to the related content in FIG. 4, which will not be repeated here. As another example, the trigger condition may be a condition in the prior art that instructs the MAC layer of the MT side of the first node to trigger the BSR, for example, it may be a condition that triggers the BSR reporting the amount of data buffered by the first node in the prior art. . For example, when there is new uplink data to be transmitted in a logical channel in a logical channel group of the first node, and the priority of this logical channel is higher than the priority of logical channels in other logical channel groups, or the priority of the first node There is new uplink data to be transmitted in a logical channel in a logical channel group, and there is no uplink data to be transmitted in other logical channels in the logical channel group, or the BSR timer expires and any logical channel in the logical channel group is BSR can be triggered when there is uplink data to be transmitted.

Optionally, in some embodiments, the first indication information may also include an identifier of the logical channel or logical channel group or RLC channel of the triggered BSR. Regarding the identification of the logical channel or logical channel group or RLC channel associated with the triggered BSR included in the first indication information, please refer to the description in FIG. 4 above, which will not be repeated here.

Optionally, in some embodiments, the MAC layer on the MT side of the first node may also receive third indication information, where the third indication information is used to indicate the time to send the BSR or the time to trigger the BSR. The MAC layer on the MT side of the first node can trigger the BSR or send the BSR according to the third indication information. For the content of the third indication information, refer to the related content in FIG. 4, which will not be repeated here.

It should be understood that the foregoing several embodiments can be implemented in combination. That is, in the method shown in FIG. 5, the MAC layer on the MT side of the first node may receive the second indication information, and may also receive the first indication information and/or the third indication information.

FIG. 6 is a schematic flowchart of another possible method for triggering a BSR provided by an embodiment of the present application. The method described in FIG. 6 may include steps 610-620, and steps 610-620 are described in detail below.

Step 610: The MAC layer on the MT side of the first node receives the third indication information.

The third indication information in the embodiment of the present application may be used to indicate the first time information, and the first time information may indicate the time of triggering the BSR, or the effective time of the triggered BSR, or the sending time of the BSR. For a specific description of the first time information, please refer to step 420, which will not be repeated here.

Step 620: The MAC layer on the MT side of the first node triggers the BSR or sends the BSR according to the third indication information.

The first case: the MAC layer on the MT side of the first node triggers the BSR according to the third indication information.

In the case that the third indication information is used to indicate the time to trigger the BSR, the MAC layer on the MT side of the first node may trigger the BSR according to the third indication information.

The MAC layer on the MT side of the first node may trigger the BSR according to the first time information indicated in the third indication information. For example, when the first time information indicated by the third indication information is 0, the third indication information may be used as a trigger notification, so that the MAC layer on the MT side of the first node can trigger the BSR according to the third indication information.

In the embodiment of the present application, when the MAC layer on the MT side of the first node triggers the BSR according to the third indication information, determine the buffer size reported in each logical channel or RLC channel or RLC bearer or logical channel group in the sent BSR The specific implementation method of is not specifically limited. As an example, the MT side of the first node may determine the buffer size in the sent BSR internally. As another example, the MAC layer on the MT side of the first node may also receive the second indication information, and may determine the buffer size in the sent BSR according to the amount of data indicated in the second indication information.

The second case: the MAC layer on the MT side of the first node sends the BSR according to the third indication information.

In the case where the third indication information is used to indicate the time to send the BSR, the MAC layer on the MT side of the first node may send the BSR according to the third indication information.

The MAC layer on the MT side of the first node determines the time to send the BSR according to the first time information indicated in the third indication information, and may send the BSR when there is an uplink resource for transmitting the BSR.

In the embodiment of the present application, before the MAC layer on the MT side of the first node sends the BSR according to the third indication information, the BSR may be triggered or generated.

As an example, the MAC layer on the MT side of the first node may also receive the first indication information, and may trigger the BSR according to the first indication information.

As another example, the MAC layer on the MT side of the first node may also receive the second indication information, and may trigger the BSR or generate the BSR according to the second indication information.

Take the example that the MAC layer on the MT side of the first node can trigger the BSR according to the second indication information. For example, the MAC layer on the MT side of the first node may be based on one or more logical channels or RLC channels or the uplink data to be received and/or local buffers carried by the RLC bearer on the MT side of the first node indicated by the second indication information. The data volume information of the uplink data triggers the BSR. For another example, the MAC layer on the MT side of the first node may determine whether to trigger the BSR according to the threshold configured by the donor base station after receiving the second indication information indication. For example, when the amount of data or total data carried by a certain logical channel or RLC channel or RLC bearer indicated by the second indication information is greater than or equal to a threshold, the MAC layer on the MT side of the first node may trigger the BSR. For another example, when the amount of data or total data carried by a certain logical channel or RLC channel or RLC bearer indicated by the second indication information is less than the threshold, the MAC layer on the MT side of the first node may not trigger the BSR.

Take the example that the MAC layer on the MT side of the first node can generate the BSR according to the second indication information. The MAC layer on the MT side of the first node can determine the reported data in each logical channel or RLC channel or RLC bearer or logical channel group in the BSR sent by the MAC layer on the MT side of the first node according to the amount of data indicated by the second indication information. buffer size.

It should be understood that the foregoing several embodiments can be implemented in combination. That is, in the method shown in FIG. 6, the MAC layer on the MT side of the first node may receive the third indication information, and may also receive the first indication information and/or the second indication information.

It should be noted that, in some embodiments, the methods in Figures 4 to 6 can be combined to implement. For example, the indication information received by the MAC layer on the MT side of the first node can be the above-mentioned first indication information and second indication information. One or more of the instruction information and the third instruction information.

Optionally, in some embodiments, the adaptation layer on the MT side of the first node sends instruction information to the MAC layer on the MT side of the first node as an example. Before sending the indication information, the adaptation layer on the MT side of the first node may also determine whether to send the indication information according to the threshold configured by the donor base station. For example, when a certain logical channel or RLC channel or the total amount of data carried by the RLC bearer in the uplink data to be transmitted by the first node is greater than or equal to the threshold, the adaptation layer on the MT side of the first node may be The MAC layer on the MT side of a node sends instruction information. For another example, when a certain logical channel or RLC channel or RLC bearer data volume or total data volume in the uplink data to be transmitted by the first node is less than the threshold, the adaptation layer on the MT side of the first node may not be The MAC layer on the MT side of a node sends instruction information.

Optionally, the adaptation layer on the MT side of the first node or the DU side of the first node may send multiple pieces of first indication information, or multiple pieces of second indication information, or multiple pieces of information to the MAC layer on the MT side of the first node. The third instruction information. It can be understood that after the adaptation layer of the MT side of the first node or the DU side of the first node instructs the MAC layer of the MT side of the first node to trigger, generate or send the BSR, the new uplink to be received by the first node can be obtained Data, for the acquired uplink data to be received by the new first node, the MAC layer of the MT side of the first node may be instructed again to trigger, generate or send the BSR, and the process can refer to the above.

Optionally, in some embodiments, the time interval between the adaptation layer of the first node sending two adjacent indication messages may be restricted, for example, greater than the first time threshold.

Optionally, the donor base station or the parent node of the first node may configure a timer (timer) for the adaptation layer of the first node. When the timer is not running or times out, the adaptation layer on the MT side of the first node can send indication information to the MAC layer when the sending conditions are met; when the timer is running, The adaptation layer on the MT side of the first node is not allowed to send indication information to the MAC layer; when the adaptation layer on the MT side of the first node meets the sending conditions and sends indication information to the MAC layer, the timer is started or restarted . As an example and not a limitation, the sending condition here may be that the adaptation layer on the MT side of the first node may receive the BSR sent by the child node of the first node.

The embodiment of the present application does not specifically limit the time for starting the timer. The timer may be started when the adaptation layer on the MT side of the first node sends a notification message to the MAC layer, or it may be started after the adaptation layer on the MT side of the first node sends the notification message to the MAC layer.

Optionally, in some embodiments, the time interval between the MAC layer triggering two adjacent BSRs may be restricted, for example, to be greater than the second time threshold.

Optionally, the donor base station or the parent node of the first node is the MAC layer configuration timer (timer) for the first node. When the timer is not running or times out, the MAC layer on the MT side of the first node can trigger a BSR when the trigger condition is met; when the timer is running, the MAC layer of the first node The MAC layer on the MT side is not allowed to trigger the BSR; when the MAC layer on the MT side of the first node meets the trigger condition and triggers the BSR, the timer is started or restarted. As an example and not a limitation, the trigger condition here may be that the MAC layer of the MT side of the first node receives the indication information sent by the adaptation layer of the MT side of the first node.

The embodiment of the present application does not specifically limit the time for starting the timer. The timer may be started when the MAC layer of the MT side of the first node triggers a BSR, or the timer may be started after the MAC layer of the MT side of the first node triggers a BSR.

Optionally, in some embodiments, the time interval between the MAC layer sending two adjacent BSRs may be restricted, for example, to be greater than the third time threshold.

Optionally, in some embodiments, the donor base station or the parent node of the first node configures a timer (timer) for the MAC layer of the first node. When the timer is not running or times out, the MAC layer on the MT side of the first node can send a BSR when the sending conditions are met; when the timer is running, the MAC layer of the first node The MAC layer on the MT side is not allowed to send the BSR; when the MAC layer on the MT side of the first node meets the sending conditions and sends the BSR, the timer is started or restarted; when the MAC layer on the MT side of the first node When the layer has no BSR to be sent or pending, the timer stops running. As an example and not a limitation, the sending condition here may be that the MAC layer on the MT side of the first node may have sufficient uplink sending resources.

The application embodiment does not specifically limit the time for starting the timer. The timer may be started when the MAC layer on the MT side of the first node sends a BSR, or the timer may be started after the MAC layer on the MT side of the first node sends a BSR.

Through the above technical solutions, it is possible to avoid receiving the RN every time in the prior art when the number of RNs and/or the number of terminal devices between the terminal equipment and the core network equipment in the wireless relay communication system are large. After the node sends the BSR, the adaptation layer on the MT side of the RN sends the indication information to the MAC layer on the MT side, which causes large signaling overhead.

Optionally, the MAC layer on the MT side of the first node in FIG. 4 or FIG. 5 or FIG. 6 may send the first BSR or the second BSR after being triggered when the network device is configured to allow BSR or enable BSR. BSR.

It should be understood that the MAC layer on the MT side of the first node receives the first indication information or the second indication information to trigger the BSR, and when there is uplink resources for transmitting the BSR to send the BSR, because the BSR is triggered to actually send the BSR During this period of time, the first node will also receive the uplink data transmitted from the child node to the first node. And this part of the uplink data is actually included in the amount of data reported in the BSR sent by the MAC layer. Therefore, when the MAC layer on the MT side of the first node actually sends the BSR, the amount of data reported in the BSR can be the first 2. The amount of data indicated in the indication information is subtracted from the amount of data that has reached the first node from when the first indication information or the second indication information is received to before the BSR is sent.

Optionally, in some embodiments, in the case where the first node has at least one parent node in FIG. 4 or FIG. 5 or FIG. 6, the second indication information may also be used to indicate whether the first node has at least one parent node. Each of the parent nodes reports uplink data to be transmitted, or data used to indicate the amount of uplink data to be transmitted by the first node to one of the parent nodes. The total uplink data to be transmitted on the first node The proportion information in the amount of data, or information indicating the proportion of the data amount of the uplink data to be transmitted that the first node reports to other parent nodes in the total amount of uplink data to be transmitted by the first node.

With reference to Figures 7-8, RN 220 is the first node, and RN 240 is the parent node of the first node as an example. The MAC layer on the MT side of the first node determines the uplink to be transmitted on the logical channel. The specific realization process of the data volume is described in detail.

FIG. 7 is a schematic flowchart of a method for determining the data amount of uplink data to be transmitted according to an embodiment of the present application. The method can be in steps 710-740, and the process of steps 710-740 will be described in detail below.

Step 710: The DU side of the RN 240 receives the BSR reported by the RN 220.

As a child node of RN 240, RN 220 can send BSR to RN 240 so as to request RN 240 for uplink resources for transmitting the uplink data that RN 220 is to receive from its child nodes, and/or request for transmission The uplink resource of the uplink data buffered locally by the RN 220.

The BSR reported by the RN 220 received by the DU side of the RN 240 may be the first BSR or the second BSR, which is not specifically limited in the embodiment of the present application.

Optionally, after receiving the BSR reported by RN 220, the DU side of RN 240 may determine the amount of uplink data waiting to be transmitted for each bearer between RN 240 and RN 220. The bearer may be a logical channel or RLC channel or RLC. The existing uplink data waiting to be transmitted can be understood as the uplink data to be received by the RN240 from the RN220, or can be understood as the uplink data that the RN220 is expected to send to the RN240. For the convenience of description, it is hereinafter referred to as the uplink data waiting to be transmitted.

As an example, if RN 240 receives the first BSR reported by RN 220, the DU side of RN 240 can split the buffer size corresponding to each logical channel group in the first BSR to the corresponding logical channels or RLC channels. Or RLC bearer. There are many specific splitting methods, which can be to evenly allocate the buffer size corresponding to each logical channel group to the corresponding logical channels by means of equal distribution, or to correspond to each logical channel group by a certain ratio The buffer size of is allocated to each corresponding logical channel. As another example, if RN 240 receives the second BSR reported by RN 220, and the second BSR reports the corresponding buffer size with each logical channel or RLC channel or RLC bearer as the granularity, there is no need to 2. Split the buffer size reported in the BSR.

Step 720: The DU side of the RN 240 sends the amount of uplink data waiting to be transmitted for each bearer between the RN 240 and the RN 220 to the adaptation layer on the MT side of the RN 240.

The DU side of the RN 240 may, after receiving the BSR reported by the RN 220, send the amount of uplink data to be received by the RN 240 to the adaptation layer on the MT side of the RN 240. As an example, the DU side of the RN 240 may directly send the buffer size carried in the BSR reported by the RN 220 to the adaptation layer on the MT side of the RN 240. As another example, the DU side of the RN 240 may also send the amount of uplink data that can be transmitted on the uplink resources indicated by the UL grant scheduled by the RN 240 for the RN 220 to the adaptation layer on the MT side of the RN 240. As another example, if RN 240 has other child nodes, the amount of uplink data to be received reported by the DU side of RN 240 to the adaptation layer on the MT side is the buffer carried in the BSR of RN 220 and other child nodes The sum of size. As another example, if semi-persistent scheduling resources or non-scheduling resources are configured on the backhaul link between RN 240 and RN 220, the DU side of RN 240 reports to the adaptation layer on the MT side. The data volume of the received uplink data may also include the data volume of the uplink data transmitted on the semi-persistent scheduling resource or the scheduling-free resource.

Step 730: The adaptation layer on the MT side of the RN 240 determines the amount of uplink data waiting to be transmitted for each bearer between the RN 240 and the RN 250 based on the bearer mapping.

The adaptation layer on the MT side of the RN 240 may receive the data amount of the uplink data to be received from the DU side of the RN 240, and the adaptation layer on the MT side of the RN 240 is based on the uplink data and/or The data volume of the locally buffered uplink data, the bearer between RN 240 and RN 220, and the mapping relationship between the bearer between RN 240 and RN 250, determine each logical channel on the backhaul link between RN 240 and RN 250 Or the amount of uplink data waiting to be transmitted in the RLC channel or RLC bearer.

Specifically, in a possible implementation, if the mapping relationship between the bearer between RN 240 and RN 220 and the bearer between RN 240 and RN 250 is a one-to-one relationship, the RN determined by the DU side of RN 240 The amount of uplink data waiting to be transmitted on each logical channel on the backhaul link between 240 and RN 220 is the uplink data waiting to be transmitted on each logical channel on the backhaul link between RN 240 and RN250 The amount of data. In another possible implementation, if the mapping relationship between the bearer between RN 240 and RN 220 and the bearer between RN 240 and RN 250 is a many-to-one relationship, the RN 240 determined on the DU side of RN 240 is The total amount of uplink data waiting to be transmitted on each logical channel on the backhaul link between RN 220 is the total amount of data waiting to be transmitted on each logical channel on the backhaul link between RN 240 and RN 250 The amount of upstream data. In another possible implementation, if the mapping relationship between the bearer between RN 240 and RN 220 and the bearer between RN 240 and RN 250 is a many-to-many relationship, the adaptation layer on the MT side of RN 240 can be based on The mapping relationship determines the amount of uplink data waiting to be transmitted on each logical channel on the backhaul link between RN 240 and RN 250.

Optionally, in some embodiments, the adaptation layer on the MT side of the RN 240 may not determine the uplinks waiting to be transmitted on each logical channel or each logical channel group on the link between the RN 240 and the RN 250 The amount of data. The data volume of all the uplink data to be transmitted to the RN 250 of the RN 240 can be sent to the RN 250 through a logical channel group in the BSR, thereby saving signaling overhead.

Step 740: The adaptation layer on the MT side of the RN 240 sends the data amount of the uplink data waiting to be transmitted for each bearer between the RN 240 and the RN 250 to the MAC layer on the MT side of the RN 240.

The adaptation layer on the MT side of the RN 240 can send the amount of uplink data to be transmitted to the RN 250 determined in step 730 to the MAC layer on the MT side of the RN 240, so that the MAC layer on the MT side of the RN 240 can be The data volume of the uplink data transmitted to the RN 250 determines the buffer size carried in the sent BSR.

FIG. 8 is a schematic flowchart of another method for determining the data amount of uplink data to be transmitted according to an embodiment of the present application. The method can be in steps 810-830, and the process of steps 810-830 will be described in detail below.

Step 810: The DU side of the RN 240 receives the BSR reported by the RN 220.

Corresponding to step 710, please refer to the description in step 710 for details, which will not be repeated here.

Step 820: The DU side of the RN 240 determines the amount of uplink data waiting to be transmitted for each bearer between the RN 240 and the RN 250 based on the bearer mapping.

After receiving the BSR reported by RN 220, the DU side of RN 240 can determine the amount of uplink data waiting to be transmitted in each logical channel or RLC channel or RLC bearer on the backhaul link between RN 240 and RN 220 . It can also determine the existence of each logical channel or RLC channel or RLC bearer on the backhaul link between RN 240 and RN 250 based on the bearer between RN 240 and RN 220 and the mapping relationship between RN 240 and RN 250 The amount of upstream data waiting to be transmitted. For details, please refer to the description of the mapping relationship in step 730, which will not be repeated here.

Step 830: The adaptation layer on the MT side of the RN 240 sends the amount of uplink data waiting to be transmitted for each bearer between the RN 240 and the RN 250 to the MAC layer on the MT side of the RN 240.

Corresponds to step 740. For details, refer to the description in step 740, which is not repeated here.

In the following, with reference to Figure 9, taking RN 220 as the first node and RN 240 as the parent node of the first node as an example, the BSR is triggered on RN220 without uplink resources to send the BSR, and an SR request is sent to request the uplink resource of the BSR. In this case, the specific implementation of sending SR is described in detail.

FIG. 9 is a schematic flowchart of a method for sending an SR according to an embodiment of the present application. The method shown in FIG. 9 may include steps 910-920, and steps 910-920 will be described in detail below.

Step 910: The MAC layer on the MT side of the RN 240 receives the fourth indication information.

The MAC layer on the MT side of the RN 240 may receive the fourth indication information sent by the upper layer of the adaptation layer on the MT side of the RN 240 or the MAC layer on the MT side of the RN 240, and the fourth indication information is used to indicate the MT of the RN 240 The MAC layer on the side triggers the SR.

Step 920: The MAC layer on the MT side of the RN 240 triggers the SR.

In the embodiment of the present application, the MAC layer on the MT side of the RN 240 may trigger an SR after receiving the fourth indication information to apply for uplink resources from the parent node RN 250 of the RN 240.

As an implementation manner, if the MAC layer on the MT side of the RN 240 has uplink resources of a physical uplink control channel (PUCCH), the SR can be sent on the PUCCH through the uplink resources.

Optionally, in some embodiments, the MAC layer on the MT side of the RN 240 may also receive the fifth indication information sent by the upper layer of the adaptation layer on the MT side of the RN 240 or the MAC layer on the MT side of the RN 240. The fifth indication information may be used to indicate the time to send the SR. Or used to indicate the effective time of SR. The MAC layer on the MT side of the RN 240 may trigger the SR according to the fifth indication information.

Optionally, in some embodiments, the BSR in the prior art (for convenience of description, hereinafter referred to as the third BSR) reports the amount of uplink data buffered locally by the node, and the second BSR is used to report the amount of data to be received by the node In the case of the amount of uplink data, it may cause the problem of repeatedly reporting applications for the same resource. The technical solutions provided in the embodiments of this application can avoid repeated applications for the same resource. The detailed description will be given below in conjunction with Figures 10-11.

For example, the third BSR may be a BSR in version 38.321 (technical specification, TS) version (version) 5.4.0 (2018.12) of the 3rd generation partnership project (3rd generation partnership project, 3GPP). The third BSR can also be understood as a special case of the first BSR in the embodiment of this application.

FIG. 10 is a schematic diagram of a possible RN sending a BSR according to an embodiment of the present application. As shown in Figure 10, after the RN triggers the BSR, it will not send the BSR until it has uplink resources for a period of time. Wherein, BSR2 may be used to indicate a second BSR, and the logical channel group in the second BSR is only used to report the amount of uplink data to be received by the RN. BSR3 may be used to indicate a third BSR, and the logical channel group in the third BSR is only used to report the amount of uplink data buffered locally by the RN. BSR TX can be used to indicate the BSR that has been sent.

Referring to Figure 10, the MT side of the RN can receive the BSR TX triggered and sent by the child node of the RN on the DU side of the RN (this BSR can be the second BSR reported by the child node of the RN, or it can be reported by the child node of the RN After the third BSR), as the data volume information of the data to be received is received and obtained, the MT side of the RN can trigger the BSR2-1 according to the above implementation, and the BSR2-1 can be used for the uplink data to be received by the RN from the child node Apply for uplink resources.

It should be understood that the MT side of the RN can determine the triggered BSR 2-1 for the uplink resource scheduled by the child node according to the buffer size carried in the BSR reported by its child node or the buffer size carried in the BSR reported by the child node. The data volume of the uplink data to be received from the child node, and to apply for uplink resources for the uplink data to be transmitted to the RN by the child node of the RN.

After the DU side of the RN receives the first uplink data transmitted by the child node of the RN, the first uplink data is the uplink data locally buffered by the RN. Therefore, the MT side of the RN will also trigger BSR3-1, which uses Then apply for uplink resources for the first uplink data buffered locally by the RN. Since the uplink data to be received by the RN reported in BSR2-1 already includes the first uplink data, that is, BSR2-1 has already applied for uplink resources for the first uplink data, the triggered BSR3-1 will cause the first uplink data to be transmitted. Repeated application of uplink resources for uplink data.

Optionally, in some embodiments, when the RN has uplink resources, the MT side of the RN can send a new BSR3-2TX, and the buffer size reported in the BSR3-2TX contains the data for the first uplink data. Cache information. Then part of the uplink data in BSR2-1 triggered before this has been reported through BSR3-2, so when the RN sends a third BSR, the second BSR that was triggered before and in pending state can be cancelled. . This can avoid repeated reporting of the first uplink data through two BSR MAC CE.

Optionally, in some embodiments, when the RN has uplink resources, the MT side of the RN can send a new BSR3-2TX, and the buffer size reported in the BSR3-2TX contains the data for the first uplink data. Cache information. In order to avoid repeated reporting of the first uplink data through two BSRs and MAC CEs, a new second BSR can be triggered while the third BSR3-2 is sent, and the amount of data to be received in the second BSR needs to be deducted. The part already reported in the third BSR3-2 is the data volume of the first uplink data that needs to be deducted.

FIG. 11 is a schematic diagram of a possible RN sending a BSR according to an embodiment of the present application. As shown in FIG. 11, BSR2 may be used to indicate a second BSR, and the second BSR is only used to report the amount of uplink data to be received by the RN. BSR3 may be used to indicate a third BSR, and the third BSR is only used to report the amount of uplink data buffered locally by the RN. BSR TX can be used to indicate the BSR that has been sent.

Referring to Figure 11, the MT side of the RN may also receive the BSR TX triggered and reported by the child node of the RN on the DU side of the RN (the BSR TX may be the first BSR reported by the child node of the RN, or it may be the child node of the RN After the reported second BSR), the MT side of the RN triggers and sends BSR2-1TX. The BSR2-1TX can be used to apply for uplink resources for the uplink data to be received by the RN from the child node. After the DU side of the RN receives the first uplink data transmitted by the child node of the RN, the first uplink data is the uplink data locally buffered by the RN. Therefore, the MT side of the RN will also trigger the BSR3-1, which uses the BSR3-1. Then apply for uplink resources for the first uplink data buffered locally by the RN. Since the uplink data to be received by the RN reported in the sent BSR2-1TX already includes the first uplink data, that is, the sent BSR2-1TX has already applied for uplink resources for the first uplink data, and the BSR3-1 will be triggered again. This results in repeated applications for uplink resources for transmitting the first uplink data.

In the embodiment of the present application, a timer may be configured for the RN, and after the timer expires, it stops timing. When the relay node sends the second BSR, if the timer is not started, start the timer; if the timer is running, restart the timer. During the operation of the timer, the MT side of the RN cannot trigger the third BSR, which applies for uplink resources for the above-mentioned part of the uplink data buffered locally in the RN. When the timer is not running or timed out, the MT side of the RN may trigger a third BSR, and the third BSR applies for uplink resources for the above-mentioned part of the uplink data buffered locally in the RN.

For example, referring to Figure 11, during the running of the timer, the MT side of the RN cannot trigger and send BSR2-2TX. When the timer is not running, BSR2-2TX can be triggered and sent.

It can be understood that, in the communication method in each embodiment of the present application, the steps implemented by the first node may also be implemented by components (such as chips or circuits) that can be used for the first node.

The method-side embodiments provided by the embodiments of the present application are described in detail above in conjunction with FIGS. 1 to 11, and the device embodiments of the present application will be described in detail below in conjunction with FIGS. 12 to 13. It should be understood that the description of the method embodiment and the description of the device embodiment correspond to each other, and therefore, the parts that are not described in detail can refer to the previous method embodiment.

FIG. 12 is a schematic block diagram of an apparatus 1200 according to an embodiment of the present application. It can be understood that the communication device 1200 may be the first node, or may be a component that can be used for the first node.

The communication device 1200 includes: a media intervention control MAC layer unit 1210, configured to receive first indication information, where the first indication information is used to indicate that a first BSR is triggered, and the first BSR is used for a first node to report to a second node The data volume of the uplink data to be received of the first node, the MAC layer unit is located in the MT unit of the mobile terminal of the first node;

The MAC layer unit 1210 is further configured to trigger the first BSR according to the first indication information;

Optionally, in some embodiments, the apparatus 1200 further includes: an upper layer unit 1220 of a MAC layer, configured to send the first indication information to the MAC layer unit, where the upper layer unit of the MAC layer is located in the In the MT unit of the first node.

Optionally, in some embodiments, the upper layer unit 1220 of the MAC layer is an adaptation layer unit.

Optionally, in some embodiments, the apparatus 1200 further includes: a distributed unit DU1230, configured to send the first indication information to the MAC layer unit.

Optionally, in some embodiments, the first indication information includes an identifier of a bearer that triggers the first BSR, and the bearer is a radio link control RLC channel, or a logical channel, or a logical channel group.

Optionally, in some embodiments, the first indication information further includes data of the uplink data to be received by the first node corresponding to the bearer corresponding to the bearer between the first node and the second node The bearer is a radio link control RLC channel, or a logical channel, or a logical channel group.

Optionally, in some embodiments, the data volume of the uplink data to be received by the first node corresponding to the bearer further includes: ratio information, and the ratio information is used to indicate the first node corresponding to the bearer. The proportion of the data volume of the uplink data to be received by the node among the total data volume of the uplink data to be received by the first node reported by the first node to the second node and the fourth node, the The fourth node is the parent node of the first node.

Optionally, in some embodiments, the MAC layer unit 1210 is further configured to: when the amount of uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold, trigger the The first BSR.

Optionally, in some embodiments, the first indication information further includes: first time information, and the first time information is used to indicate one or more of the following: MAC on the MT side of the first node The time at which the first BSR is triggered by the layer, or the time at which the MAC layer of the MT side of the first node sends the first BSR, the expected reception time of the uplink data to be received by the first node, the first A valid time of the indication information, the valid time after the first BSR is triggered.

Optionally, in some embodiments, the MAC layer unit 1210 is further configured to: send the first BSR to the second node, and the amount of data reported in the first BSR is all corresponding to the bearer. The data amount of the uplink data to be received by the first node minus a first data amount, where the first data amount is from when the MAC layer unit receives the first indication information to before sending the first BSR, The data volume of the uplink data reaching the first node.

Optionally, in some embodiments, the MAC layer unit 1210 is further configured to: receive second indication information, where the second indication information is used to indicate that a second BSR is triggered, and the second BSR is The node reports the data volume of the uplink data to be received by the first node;

The MAC layer unit 1210 is further configured to: trigger the second BSR according to the second indication information, and the time interval between the time when the second BSR is triggered and the time when the first BSR is triggered is greater than a first threshold .

FIG. 13 is a schematic block diagram of a communication device 1300 according to an embodiment of the present application. The communication device 1300 may include a processor 1301 and a memory 1303.

Wherein, the processor 1301 may be connected to the memory 1303. The memory 1303 may be used to store program codes and data of the communication device 1300. Therefore, the memory 1303 may be a storage unit inside the processor 1301, or an external storage unit independent of the processor 1301, or may include a storage unit inside the processor 1301 and an external storage unit independent of the processor 1301. part.

Optionally, the communication device 1300 may further include a bus 1304. Among them, the memory 1303 may be connected to the processor 1301 via a bus 1304; the bus 1304 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus 1305 can be divided into an address bus, a data bus, a control bus, and so on. For ease of presentation, only one thick line is used in FIG. 13, but it does not mean that there is only one bus or one type of bus.

The processor 1301 may include but is not limited to at least one of the following: central processing unit (CPU), microprocessor, digital signal processor (DSP), microcontroller (microcontroller unit, MCU), or artificial intelligence processing Various computing devices that run software, such as a computer, and each computing device may include one or more cores for executing software instructions for calculation or processing. The processor can be a single semiconductor chip, or it can be integrated with other circuits to form a semiconductor chip. For example, it can form an SoC (on-chip) with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits). System), or it can be integrated into the ASIC as a built-in processor of an ASIC, and the ASIC integrated with the processor can be packaged separately or together with other circuits. In addition to the core used to execute software instructions for calculation or processing, the processor can also include necessary hardware accelerators, such as field programmable gate array (FPGA) and PLD (programmable logic device) , Or a logic circuit that implements dedicated logic operations.

When the program is executed, the processor 1301 is configured to configure the media intervention control MAC layer unit to receive first indication information from the upper layer of the MAC layer unit. The first indication information is used to indicate that the first BSR is triggered. The BSR is used by the first node to report the data volume of the uplink data to be received of the first node to the second node, and the MAC layer unit is located in the MT unit of the mobile terminal of the first node;

The processor 1301 is further configured to configure the MAC layer unit to trigger the first BSR according to the first indication information;

In another possible implementation manner, the processor 1301 is configured to configure the distributed unit DU to send the first indication information to the MAC layer unit.

In another possible implementation manner, the processor 1301 is further configured to configure the MAC layer unit to trigger when the amount of uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold The first BSR.

Optionally, the communication device 1300 further includes a transceiver 1302, and the transceiver 1302 is connected to the processor 1301 through the bus 1304, and is used to send and receive the BSR sent by the child node of the communication device 1300, or to send the BSR to the parent node. BSR.

In another possible implementation manner, the transceiver 1302 is used for the MAC layer unit to send the first BSR, and the amount of data reported in the first BSR is the uplink to be received by the first node corresponding to the bearer The data volume of the data minus the first data volume, where the first data volume is the uplink that reaches the first node from when the MAC layer unit receives the first indication information to before sending the first BSR The amount of data.

It can be understood that the functions and corresponding operations of the various modules of the communication device in the embodiments of the present application can refer to the related descriptions in the method embodiments. In addition, the modules in the embodiments of the present application may also be referred to as units or circuits, which are not limited in the embodiments of the present application.

It can also be understood that the communication device may perform some or all of the steps in the above-mentioned embodiments, and these steps or operations are only examples, and the embodiments of the present application may also perform other operations or variations of various operations. In addition, each step may be executed in a different order presented in the foregoing embodiment, and it may not be necessary to perform all operations in the foregoing embodiment.

The embodiments of the present application also provide a computer-readable medium for storing a computer program, and the computer program includes instructions for executing a method in any possible implementation manner of any one of the foregoing aspects.

The embodiments of the present application also provide a computer program product, which is applied to a communication device, the computer program product includes: computer program code, when the computer program code is run by a computer, the computer can execute any of the above-mentioned possibilities The method in the implementation.

The embodiment of the present application also provides a chip system, which is applied to a communication device. The chip system includes: at least one processor, at least one memory, and an interface circuit, and the interface circuit is responsible for information interaction between the chip system and the outside world. The at least one memory, the interface circuit, and the at least one processor are interconnected by wires, and instructions are stored in the at least one memory; the instructions are executed by the at least one processor to perform all the above aspects. The operation of the network element in the method described above. The at least one memory is optional.

The method provided in the embodiments of the present application can be applied to a relay node, which includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also referred to as main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, in the embodiment of the present application, the specific structure of the execution body of the signal transmission method is not particularly limited in the embodiment of the present application, as long as the program that records the code of the signal transmission method in the embodiment of the present application can be run to It is sufficient to communicate according to the signal transmission method of the embodiment of the present application. For example, the execution subject of the method for triggering BSR in the embodiment of the present application may be a relay node, or the relay node can call and execute the program. Module.

In addition, various aspects or features of the embodiments of the present application may be implemented as methods, devices, or products using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, compact discs (CD), digital versatile discs (DVD)) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). In addition, various storage media described herein may represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

In addition, the terms "system" and "network" in this article are often used interchangeably in this article. The term "and/or" in this article is only an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and/or other information.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk (SSD)), etc. .

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A method for triggering a buffer status report BSR, characterized in that the method includes:

The media intervention control MAC layer on the MT side of the mobile terminal of the first node receives first indication information. The first indication information is used to indicate the triggering of the first BSR, and the first BSR is used to report the first BSR to the second node. The amount of uplink data to be received by the node;

The MAC layer of the MT of the first node triggers the first BSR according to the first indication information;

The first node is a relay node in a wireless relay system, and the second node is a parent node of the first node in the wireless relay system.
The method according to claim 1, wherein the receiving the first indication information by the media intervention control MAC layer on the MT side of the mobile terminal of the first node comprises:

The MAC layer on the MT side of the first node receives the first indication information from an upper layer of the MAC layer on the MT side of the first node.
The method according to claim 2, wherein the upper layer of the MAC layer on the MT side of the first node is an adaptation layer on the MT side of the first node.
The method according to claim 1, wherein the receiving the first indication information by the media intervention control MAC layer on the MT side of the mobile terminal of the first node comprises:

The MAC layer on the MT side of the first node receives the first indication information from the distributed unit DU side of the first node.
The method according to any one of claims 1 to 4, wherein the first indication information includes an identifier of a bearer that triggers the first BSR, and the bearer is a radio link control RLC channel, or a logical Channel, or logical channel group.
The method according to any one of claims 1 to 5, wherein the first indication information further includes the first node corresponding to the bearer corresponding to the bearer between the first node and the second node. The amount of uplink data to be received by a node, and the bearer is a radio link control RLC channel, or a logical channel, or a logical channel group.
The method according to claim 6, wherein the data volume of the uplink data to be received by the first node corresponding to the bearer further comprises: ratio information, and the ratio information is used to indicate all the data corresponding to the bearer. The proportion of the data volume of the uplink data to be received by the first node in the total data volume of the uplink data to be received by the first node reported by the first node to the second node and the fourth node , The fourth node is the parent node of the first node.
The method according to claim 6 or 7, wherein the method further comprises:

When the data amount of the uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold, the MAC layer of the MT side of the first node triggers the first BSR.
The method according to any one of claims 1 to 8, wherein the first indication information further comprises: first time information, and the first time information is used to indicate one or more of the following:

The time when the MAC layer of the MT side of the first node triggers the first BSR, or the time when the MAC layer of the MT side of the first node sends the first BSR, the time to be received by the first node The expected receiving time of the uplink data, the valid time of the first indication information, and the valid time after the first BSR is triggered.
The method according to any one of claims 6 to 9, wherein the method further comprises:

The MAC layer on the MT side of the first node sends the first BSR to the second node, and the amount of data reported in the first BSR is the uplink data to be received by the first node corresponding to the bearer The first data amount is subtracted from the first data amount, and the first data amount is from the time when the MAC layer on the MT side of the first node receives the first indication information to before sending the first BSR, and reaches the The amount of uplink data of the first node.
The method according to any one of claims 1 to 10, wherein the method further comprises:

The MAC layer on the MT side of the first node receives second indication information, where the second indication information is used to indicate the triggering of a second BSR, and the second BSR is used to report the waiting status of the first node to the second node. The data volume of the received uplink data;

The MAC layer of the MT of the first node triggers the second BSR according to the second indication information, and the time interval between the time when the second BSR is triggered and the time when the first BSR is triggered is greater than the first BSR A time threshold.
A communication device, characterized in that the device includes:

The media intervention control MAC layer unit is configured to receive first indication information, where the first indication information is used to indicate the triggering of a first BSR, and the first BSR is used by the first node to report to the second node the information of the first node The data volume of the uplink data to be received, the MAC layer unit is located in the MT unit of the mobile terminal of the first node;

The MAC layer unit is further configured to trigger the first BSR according to the first indication information;

The first node is a relay node in a wireless relay system, and the second node is a parent node of the first node in the wireless relay system.
The device according to claim 12, wherein the device further comprises:

The upper layer unit of the MAC layer is configured to send the first indication information to the MAC layer unit, and the upper layer unit of the MAC layer is located in the MT unit of the first node.
The device according to claim 13, wherein the upper unit of the MAC layer is an adaptation layer unit.
The device according to claim 12, wherein the device further comprises:

The distributed unit DU is used to send the first indication information to the MAC layer unit.
The apparatus according to any one of claims 12 to 15, wherein the first indication information includes an identifier of a bearer that triggers the first BSR, and the bearer is a radio link control RLC channel, or Logical channel, or logical channel group.
The apparatus according to any one of claims 12 to 16, wherein the first indication information further comprises the first node corresponding to the bearer corresponding to the bearer between the first node and the second node. The amount of uplink data to be received by a node, and the bearer is a radio link control RLC channel, or a logical channel, or a logical channel group.
The apparatus according to claim 17, wherein the data volume of the uplink data to be received by the first node corresponding to the bearer further comprises: ratio information, and the ratio information is used to indicate all the data corresponding to the bearer The proportion of the data volume of the uplink data to be received by the first node in the total data volume of the uplink data to be received by the first node reported by the first node to the second node and the fourth node , The fourth node is the parent node of the first node.
The device according to claim 17 or 18, wherein the MAC layer unit is further configured to:

Triggering the first BSR when the amount of uplink data to be received by the first node corresponding to the bearer is greater than or equal to a first threshold.
The apparatus according to any one of claims 12 to 19, wherein the first indication information further comprises: first time information, and the first time information is used to indicate one or more of the following:

The time when the MAC layer of the MT side of the first node triggers the first BSR, or the time when the MAC layer of the MT side of the first node sends the first BSR, the time to be received by the first node The expected receiving time of the uplink data, the valid time of the first indication information, and the valid time after the first BSR is triggered.
The device according to any one of claims 17 to 20, wherein the MAC layer unit is further configured to:

The second node sends the first BSR, and the data volume reported in the first BSR is the data volume of the uplink data to be received by the first node corresponding to the bearer minus the first data volume, the The first data volume is the data volume of the uplink data that reaches the first node from when the MAC layer unit receives the first indication information to before sending the first BSR.
The apparatus according to any one of claims 12 to 21, wherein the MAC layer unit is further configured to: receive second indication information, the second indication information being used to indicate triggering of a second BSR, and The second BSR is used to report the amount of uplink data to be received by the first node to the second node;

The MAC layer unit is further configured to: trigger the second BSR according to the second indication information, and the time interval between the time when the second BSR is triggered and the time when the first BSR is triggered is greater than a first threshold.
A method for triggering a buffer status report BSR, characterized in that the method includes:

The first node reports a BSR, where the BSR is used to report the amount of uplink data to be received by the first node;

The media intervention control MAC control element CE corresponding to the BSR has a logical channel group as the granularity, and the BSR is used to provide the amount of uplink data on each logical channel group LCG.
The method according to claim 23, wherein the MAC CE corresponding to the BSR corresponds to a logical channel identifier (LCID).
The method according to claim 23, wherein one or more LCIDs are used for MAC CE corresponding to one or more BSR formats.
The method according to any one of claims 23-25, wherein the priority of the MACCE corresponding to the BSR is higher than the MAC CE filling the BSR and lower than the MAC CE of other BSRs except the filling BSR CE priority.
The method according to any one of claims 23-26, wherein the priority of the BSR is higher than the BSR that reports the amount of uplink data buffered by the first node.
The method according to claim 27, wherein the BSR is used to trigger a scheduling request SR, and the SR is used to request transmission of uplink resources of the BSR.
A communication device, characterized by comprising a processor, the processor is coupled with a memory, the memory is used to store a computer program or instruction, and the processor is used to execute the computer program or instruction, so that claims 1 to 11. The method of any one of claims 23 to 28.
A device for executing the method according to any one of claims 1 to 11, or for executing the method according to any one of claims 23 to 28.
A computer-readable storage medium, characterized by comprising instructions, when the instructions run on a communication device, cause the communication device to execute the method according to any one of claims 1 to 11 or claims 23 to 28 Any one of the methods.
A computer program product, characterized in that the computer program product includes instructions, which when run on a computer, cause a communication device to execute the method according to any one of claims 1 to 11 or claim 23 The method of any one of to 28.
A communication system, characterized by comprising a first node and a parent node of the first node, wherein the first node is used to execute the method of any one of claims 1 to 11 or the method of claims 23 to 28 The method of any one of.