WO2020199829A1

WO2020199829A1 - Buffer state report transmission method and apparatus

Info

Publication number: WO2020199829A1
Application number: PCT/CN2020/077654
Authority: WO
Inventors: 卓义斌; 戴明增; 朱元萍; 刘菁
Original assignee: 华为技术有限公司
Priority date: 2019-03-29
Filing date: 2020-03-03
Publication date: 2020-10-08
Also published as: CN111757517A

Abstract

Provided are a buffer state report transmission method and apparatus. The method comprises: a first node generating a MAC PDU containing a BSR MAC CE, wherein there are M logical channel groups (LCGs) about to transmit uplink data, if M is less than or equal to N, the format of the BSR MAC CE is a first format, the BSR MAC CE in the first format comprises no more than M pairs of LCG identity fields and buffer size fields, M is an integer greater than zero, N is an integer greater than one, each LCG identity field of the no more than M pairs of LCG identity fields and buffer size fields uniquely indicates an LCG about to transmit uplink data, and each buffer size field of the no more than M pairs of LCG identity fields and buffer size fields uniquely indicates the size of uplink data to be transmitted by the LCG about to transmit uplink data; and the first node sending the MAC PDU to a second node.

Description

Method and device for transmitting buffer status report

Cross references to related applications

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on March 29, 2019, the application number is 201910252630.0, and the application name is "a buffer status report transmission method and device", the entire content of which is incorporated by reference In this application.

Technical field

This application relates to the field of communication technology, and in particular to a method and device for transmitting a buffer status report.

Background technique

In the long term evolution (LTE) system and the new radio (NR) system and other communication systems, if the terminal-side device has uplink data to be sent, the terminal-side device first sends a buffer state report to the base station. report, BSR). The BSR can indicate the size of the buffered data to be sent by the terminal-side device, so the base station can allocate a corresponding number of uplink resources to the terminal-side device according to the size of the buffered data indicated by the BSR. The existing BSR reporting mechanism uses Logical Channel Group (LCG) as a unit to report. The buffer data size of the logical channel group includes the total size of buffer data on all logical channels (Logical Channel, LCH) corresponding to this LCG, and the base station allocates uplink resources according to the total size of the LCG data volume. Currently, the number of LCGs defined in the LTE system is 4, and the number of LCGs defined in the NR system is 8.

In the process of reporting the BSR, the terminal-side device can trigger different types of BSRs according to different triggering conditions, and when the sending conditions are met, for example, when there is an uplink resource that satisfies the sending of the BSR, the BSR of the corresponding format is selected for reporting. Among them, the BSR types triggered by the terminal side device include Padding BSR, Periodic BSR, and Regular BSR. BSR formats include Long BSR, Long Truncated BSR, Short BSR, and Short Truncated BSR. If the BSR that triggers the terminal-side device to report is Regular BSR or Periodic BSR, when more than one logical channel group has data to report, the terminal-side device chooses to report Long BSR; when there is a logical channel group with data to report, The terminal side device chooses to report Short BSR.

Currently, in the NR protocol, the Long BSR includes X logical channel group index fields, each logical channel group index field corresponds to a logical channel group, and the value of X is the maximum number of LCGs defined in the system. In the future NR system, the number of defined LCGs may be 16 or 32 or greater, resulting in a larger number of bytes occupied by the logical channel group index field, which makes Long BSR more expensive.

Summary of the invention

The embodiments of the present application provide a buffer status report transmission method and device, which are used to solve the problem of excessive overhead of transmitting the buffer status report.

In the first aspect, an embodiment of the present application provides a buffer status report transmission method. The method includes: a first node generates a MAC PDU including a BSR MAC CE; wherein the number of logical channel group LCGs to be transmitted uplink data is M If M is less than or equal to N, the format of the BSR MAC CE is the first format, and the BSR MAC CE in the first format includes at most M pairs of LCG identification fields and buffer size fields, M is an integer greater than 0, and N Is an integer greater than 1; each of the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an LCG for uplink data to be transmitted, and the at most M pairs of LCG identification fields and buffer size fields Each of the buffer size fields uniquely indicates the size of the uplink data to be transmitted by the LCG of the uplink data to be transmitted; the first node sends the MAC PDU to the second node.

Through the above method, when the first node adopts the BSR MAC CE of the first format, it only includes at most M LCG identification domains, and does not need to include X LCG identification domains. The value of X is the maximum number of LCGs defined in the system. Therefore, the number of bits occupied by the BSR MAC CE can be reduced, and the overhead of the buffer status report can be reduced.

In a possible implementation manner, if M is greater than N, the BSR MAC CE format is the second format, and the BSR MAC CE of the second format includes K LCG index fields and at most M buffer size fields; Each LCG index field in the K LCG index fields uniquely indicates an LCG; when one LCG index field in the K LCG index fields is the first preset value, it is used to indicate that it corresponds to the LCG index field The LCG has uplink data to be transmitted or the buffer size field used to indicate the LCG corresponding to the LCG index field is included in the BSR MAC CE; or, when one of the K LCG index fields When it is the second preset value, it is used to indicate that the LCG corresponding to the LCG index field does not have uplink data to be transmitted; wherein, each of the at most M buffer size fields uniquely indicates one The size of the uplink data to be transmitted by the LCG; K is an integer greater than or equal to M, and K is the maximum number of LCGs or a value pre-defined or configured on the network side.

In a possible implementation manner, the BSR MAC CE includes a BSR, and when the BSR is a regular BSR or a periodic BSR, the BSR MAC CE of the first format includes an M-to-LCG identification field and a buffer size field.

In a possible implementation manner, the BSR MAC CE includes a BSR. When the BSR is a regular BSR or a periodic BSR, the BSR MAC CE of the second format includes K LCG index fields and M buffer sizes. area.

In a possible implementation manner, the BSR MAC CE is transmitted through padding bits, and the BSR included in the BSR MAC CE is a padding BSR;

When M is less than or equal to N, and the number of padding bits is greater than or equal to the bit overhead required by the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by M LCGs, the BSR MAC CE includes M to LCG identification field and buffer size field;

Or, when M is less than or equal to N, and the number of padding bits is less than the bit overhead required for using the BSR MAC CE of the first format to report the size of the uplink data to be transmitted for M LCGs, the BSR of the first format The MAC CE includes the P pair LCG identification field and the buffer size field. P is an integer less than M and greater than 0.

In the above method, the buffer size field included in the BSR MAC CE of the first format is determined according to the number of padding bits, so that the padding bits can be fully utilized to transmit the BSR MAC CE.

In a possible implementation manner, the BSR MAC CE is transmitted through padding bits, and the BSR included in the BSR MAC CE is a padding BSR; when M is greater than N, and the number of padding bits is greater than or equal to using the first When the BSR MAC CE in the second format reports the bit overhead required for the size of the uplink data to be transmitted by M LCGs, the BSR MAC CE in the second format includes K LCG index fields and M buffer size fields;

Or, when M is greater than N, and the number of padding bits is less than the bit overhead required for the BSR MAC CE of the second format to report the size of the uplink data to be transmitted for M LCGs, the BSR MAC of the second format The CE includes K LCG index fields and Q buffer size fields, and Q is an integer less than M and greater than 0.

In the above method, the buffer size field included in the BSR MAC CE of the second format is determined according to the number of padding bits, so that the padding bits can be fully utilized to transmit the BSR MAC CE.

In a possible implementation manner, the BSR MAC CE of the first format further includes at most M flag fields;

Each of the at most M flag fields is located before a pair of the LCG flag field and the buffer size field, and each of the at most M flag fields is used to indicate the one after the flag field. For the LCG identification field and the buffer size field, is it the last pair of the LCG identification field and the buffer size field in the BSR MAC CE of the first format; or, each of the at most M flag fields Located after a pair of LCG identification fields and buffer size fields, each of the at most M flag fields is used to indicate whether a pair of LCG identification fields and buffer size fields before the flag field are all The last pair of LCG identification field and buffer size field in the BSR MAC CE of the first format.

In a possible implementation manner, the MAC subheader corresponding to the BSR MAC CE includes a format field, and the format field is used to indicate the format of the BSR MAC CE.

In a possible implementation manner, the bit width of the LCG identification field or the value range of the LCG identification field is indicated by the network configuration or by the first predefined field in the MAC subheader corresponding to the BSR MAC CE.

In a possible implementation, the bit width of the K LCG index fields or the value range of the LCG identifier corresponding to the K LCG index fields is configured by the network or in the MAC subheader corresponding to the BSR MAC CE. The second predefined field indicates.

In the second aspect, the embodiment of the present application provides a buffer status report transmission method, including: a second node receives a MAC PDU from a first node; the MAC PDU includes a BSR MAC CE; wherein, the logical channel for transmitting uplink data The number of group LCG is M. If M is less than or equal to N, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG identification fields and buffer size fields, M Is an integer greater than 0; each LCG identification field in the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an LCG of uplink data to be transmitted, and in the at most M pairs of LCG identification fields and buffer size fields Each of the buffer size fields uniquely indicates the size of the uplink data to be transmitted by the LCG of the uplink data to be transmitted; the second node determines the size of the uplink data to be transmitted by the first node according to the MAC PDU.

Through the above method, when the first node adopts the BSR MAC CE of the first format, it includes at most M LCG identification domains, and does not need to include X LCG identification domains. The value of X is the maximum number of LCGs defined in the system, so It can reduce the number of bits occupied by BSR MAC CE, and reduce the overhead of buffer status reporting.

When M is greater than N, and the number of padding bits is greater than or equal to the bit overhead required by the CE to report the size of the uplink data to be transmitted for M LCGs using the BSR MAC of the second format, the BSR MAC of the second format CE includes K LCG index fields and M buffer size fields;

Each of the at most M flag fields is located before a pair of the LCG flag field and the buffer size field, and each of the at most M flag fields is used to indicate the one after the flag field. For the LCG identification field and the buffer size field, whether it is the last pair of the LCG identification field and the buffer size field in the BSR MAC CE of the first format;

Alternatively, each of the at most M flag fields is located after a pair of LCG flag fields and buffer size fields, and each of the at most M flag fields is used to indicate that it is before the flag field Whether the pair of LCG identification field and buffer size field in the first format is the last pair of LCG identification field and buffer size field in the BSR MAC CE of the first format.

In a third aspect, an embodiment of the present application provides a buffer status report transmission method, including: when the first node determines that there are M logical channel groups LCG to be transmitted uplink data and padding bits, generating according to the number of padding bits A MAC PDU containing a BSR MAC CE; wherein, if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M For the LCG identification field and the buffer size field, M is an integer greater than 0; the at most M pairs of the LCG identification field and each LCG identification field in the buffer size field uniquely indicate an LCG to be transmitted uplink data, and the at most M uniquely indicates the size of the uplink data to be transmitted by the LCG of the LCG identification field and the buffer size field in the LCG identification field and the buffer size field; the first node sends the MAC PDU to the second node.

In a possible implementation, if the number of padding bits is greater than or equal to the first preset threshold, the format of the BSR MAC CE is the second format, and the BSR MAC CE of the second format Including K LCG index fields and at most M buffer size fields;

Each LCG index field in the K LCG index fields uniquely indicates one LCG, and when one LCG index field in the K LCG index fields is a first preset value, it is used to indicate the relationship with the LCG index field The corresponding LCG has uplink data to be transmitted or the buffer size field used to indicate the LCG corresponding to the LCG index field is included in the BSR MAC CE; when one LCG index field in the K LCG index fields is When the second preset value is taken, it is used to indicate that there is no uplink data to be transmitted in the LCG corresponding to the LCG index field; each of the at most M buffer size fields uniquely indicates an LCG to be transmitted The size of the uplink data; K is an integer greater than or equal to M, and K is the maximum number of LCGs or a value pre-defined or configured on the network side.

In a possible implementation, if the number of padding bits is less than the first preset threshold, and the number of padding bits is greater than or equal to the BSR MAC CE reporting the M LCGs in the first format When the bit overhead required for the size of the uplink data to be transmitted, the BSR MAC CE of the first format includes an M pair LCG identification field and a buffer size field;

Alternatively, if the number of padding bits is less than the first preset threshold, and the number of padding bits is less than that required by the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by the M LCGs In the case of bit overhead, the BSR MAC CE in the first format includes a P to LCG identification field and a buffer size field, and P is an integer less than M and greater than 0.

In a possible implementation manner, when the number of padding bits is greater than or equal to the first preset threshold, and the number of padding bits is greater than or equal to the BSR MAC CE reporting M using the second format When the bit overhead required for the size of uplink data to be transmitted by an LCG, the BSR MAC CE of the second format includes K LCG index fields and M buffer size fields;

Or, when the number of padding bits is greater than or equal to the first preset threshold, and the number of padding bits is less than the size of the uplink data to be transmitted for M LCGs reported by the BSR MAC CE using the second format When the bit overhead is required, the BSR MAC CE in the second format includes K LCG index fields and Q buffer size fields, and Q is an integer less than M and greater than 0.

In a fourth aspect, an embodiment of the present application provides a buffer status report transmission method, including: a network side device receives a media access control MAC protocol data unit PDU from a first node; the MAC PDU includes a buffer status report BSR media Access control MAC control element CE; where the number of logical channel groups LCG to be transmitted uplink data is M, and if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first One format, the BSR MAC CE of the first format includes at most M pairs of LCG identification fields and buffer size fields, where M is an integer greater than 0; each LCG in the at most M pairs of LCG identification fields and buffer size fields The identification field uniquely indicates an LCG of uplink data to be transmitted, and each buffer size field in the at most M pairs of LCG identification field and buffer size field uniquely indicates the uplink data size of an LCG to be transmitted for uplink data; The second node determines the size of the uplink data to be transmitted by the first node according to the MAC PDU.

In the fifth aspect, this application provides a device. The apparatus has the function of implementing the terminal-side equipment involved in the first to fourth aspects above. For example, the apparatus includes the terminal-side equipment to execute the modules or units corresponding to the steps involved in the first to fourth aspects above. Means, the functions or units or means can be implemented by software, or by hardware, or by hardware executing corresponding software.

In a possible design, the device includes a processing unit and a transceiving unit, and the functions performed by the processing unit and the transceiving unit may correspond to the steps performed by the terminal side equipment involved in the first to fourth aspects.

In a possible design, the device includes a processor, and may also include a transceiver. The transceiver is used to send and receive signals, and the processor executes program instructions to accomplish any of the above-mentioned first to fourth aspects. The method executed by the terminal-side device in the design or implementation of the.

Wherein, the apparatus may further include one or more memories, and the memories are used for coupling with the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application.

In a possible manner, the memory stores necessary computer program instructions and/or data for realizing the functions of the terminal-side device involved in the first to fourth aspects. The processor can execute the computer program instructions stored in the memory to complete the method executed by the terminal-side device in any possible design or implementation of the first to fourth aspects.

In a sixth aspect, this application provides a device. The apparatus has the function of realizing the network-side equipment involved in the first to fourth aspects. For example, the apparatus includes the module or unit or unit corresponding to the network-side equipment executing the steps involved in the first to fourth aspects. Means. The functions or units or means can be implemented by software, or by hardware, or by hardware executing corresponding software.

In a possible design, the device includes a processing unit, a transceiving unit, and the functions performed by the processing unit and transceiving unit can be the same as the network side equipment involved in any possible design or implementation of the first to fourth aspects. The steps performed correspond to those.

In another possible design, the communication device includes a processor, and may also include a transceiver. The transceiver is used to send and receive signals, and the processor executes program instructions to complete the first to fourth aspects. The method executed by the network side device in any possible design or implementation.

In a possible manner, the memory stores the necessary computer program instructions and/or data to implement the functions of the network side device involved in any possible design or implementation manner of the first to fourth aspects. The processor can execute the computer program instructions stored in the memory to complete the method executed by the network side device in any possible design or implementation of the first to fourth aspects.

The embodiment of the present application provides a computer-readable storage medium, which stores computer-readable instructions. When the computer reads and executes the computer-readable instructions, the communication device is caused to perform any of the above-mentioned possibilities. Method in design.

The embodiment of the present application provides a computer program product. When the computer reads and executes the computer program product, the communication device executes any of the above-mentioned possible design methods.

An embodiment of the present application provides a chip, which is connected to a memory, and is used to read and execute a software program stored in the memory, so as to implement any of the above-mentioned possible design methods.

An embodiment of the present application provides a system including the terminal side device in the first aspect and the network side device in the second aspect.

An embodiment of the present application provides a system including the terminal side device in the third aspect and the network side device in the fourth aspect.

Description of the drawings

FIG. 1 shows a schematic diagram of a communication system suitable for the communication method of an embodiment of the present application;

Figure 2 is a schematic diagram of a BSR MAC CE in a first format provided by an embodiment of this application;

FIG. 3 is a schematic diagram of another BSR MAC CE in the first format provided by an embodiment of this application;

Figure 4 is a schematic diagram of another BSR MAC CE in the first format provided by an embodiment of the application;

FIG. 5 is a schematic diagram of a BSR MAC CE in a second format provided by an embodiment of this application;

FIG. 6 is a schematic diagram of a BSR MAC CE in a third format provided by an embodiment of this application;

FIG. 7 is a schematic flowchart of a method for transmitting a buffer status report according to an embodiment of the application;

FIG. 8 is a schematic flowchart of a method for transmitting a buffer status report according to an embodiment of the application;

FIG. 9 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of this application.

detailed description

The embodiments of the present application will be described in detail below in conjunction with the accompanying drawings of the specification.

The embodiments of this application can be applied to various mobile communication systems, such as: new radio (NR) system, long term evolution (LTE) system, advanced long term evolution (LTE-A) Systems, evolved long term evolution (evolved long term evolution, eLTE) systems, future communication systems, and other communication systems, are specifically not limited here.

To facilitate the understanding of the embodiments of the present application, first, the communication system shown in FIG. 1 is taken as an example to describe in detail the communication system applicable to the embodiments of the present application. Fig. 1 shows a schematic diagram of a communication system applicable to the communication method of the embodiment of the present application. As shown in FIG. 1, the communication system 100 includes a network side device 110, a wireless backhaul device 120, and at least one terminal side device (the terminal side device 130, the terminal side device 140, and the terminal side device 150 in FIG. 3). The terminal-side device is connected to the wireless backhaul device 120 or the network-side device 110 in a wireless manner. The embodiment of the present application does not limit the number of network-side devices, wireless backhaul devices, and terminal-side devices included in the communication system.

In the embodiment of the present application, the terminal-side device is a device with a wireless transceiver function or a chip that can be installed in the device. Among them, the device with wireless transceiver function may also be referred to as user equipment (UE), terminal-side equipment, access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile equipment, user Terminal, user agent or user device. In actual applications, the terminal-side devices in the embodiments of this application may be mobile phones, relay devices, tablets, computers with wireless transceiver functions, virtual reality (VR) terminals, Augmented reality (AR) terminals, wireless terminals in industrial control (industrial control), wireless terminals in self-driving (self-driving), wireless terminals in remote medical, and smart grid (smart grid) The wireless terminal in the transportation safety (transportation safety), the wireless terminal in the smart city (smart city), the wireless terminal in the smart home (smart home), etc. The embodiment of this application does not limit the application scenario. In this application, the aforementioned devices with wireless transceiver functions and chips that can be installed in the devices are collectively referred to as terminal-side devices.

In the embodiments of the present application, the network side device may be a wireless access device under various standards, such as an evolved Node B (eNB), a radio network controller (RNC), or a Node B (Node B). B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), the access point (AP) and transmission point (transmission and reception point, TRP or transmission point, TP) in the wireless fidelity (WIFI) system, etc. It can also be a 5G (NR) system The gNB or transmission point (TRP or TP) in the 5G system, one or a group of antenna panels (including multiple antenna panels) of the base station in the 5G system, or the network node that forms the gNB or transmission point, such as a baseband unit ( BBU), or DU under the centralized unit-distributed (CU-DU) architecture, or the integrated access and backhaul (IAB) or wireless relay network The donor base station, further, in the LTE relay network, the donor base station is called a donor eNB (Donor eNB, DeNB), and in the NR wireless backhaul network, the donor base station is also called an IAB donor (integrated access and backhaul donor, IAB donor) or Host gNB (Donor gNB, DgNB).

In the embodiments of this application, the wireless backhaul device may also be called a relay node (RN), or may also be called an IAB node (IAB node), and may provide wireless access for user equipment (UE). Into service. Specifically, the service data of the UE is connected to the access network device by the wireless backhaul device through the wireless backhaul link.

The network architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that with the network With the evolution of architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

In the embodiment of the present application, the BSR is sent through a medium access control (MAC) protocol data unit (protocol data unit, PDU). A MAC PDU includes at least one MAC sub (sub) PDU, where a MAC sub PDU includes at least a MAC sub-header, and may also include content such as a MAC control element (CE). In the embodiment of this application, when the MAC CE in the MAC sub PDU includes the BSR, the MAC CE may be referred to as the BSR MAC CE.

In the embodiments of this application, there are multiple formats for BSR MAC CE. Different formats of BSR MAC CE are applicable to different scenarios. The MAC subheader of the BSR MAC CE may include a format field, and the format field is used to indicate the BSR The format of MAC CE is described separately below.

In this embodiment of the application, when there are M LCGs to be transmitted with uplink data, the BSR MAC CE of the first format includes at most M pairs of LCG identification fields and buffer size fields, and M is an integer greater than 0; Each LCG identification field in the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an LCG of uplink data to be transmitted, and the size of each buffer in the at most M pairs of LCG identification fields and buffer size fields The field uniquely indicates the size of the uplink data to be transmitted by an LCG for which uplink data is to be transmitted.

The bit width of the LCG identification field or the value range of the LCG identification field is configured by the network or indicated by the first predefined field in the MAC subheader corresponding to the BSRMAC CE; or the bit width of the LCG identification field Or the value range of the LCG identification field is determined according to the maximum value of the number of LCGs. Further, the bit width of the LCG identification field may be determined according to a logarithmic operation of the maximum value of the LCG number and then rounding up.

Exemplarily, the MAC subheader of the BSR MAC CE in the first format further includes a length field, and the length field is used to indicate the size of the BSR MAC CE.

For example, as shown in FIG. 2, a schematic diagram of a BSR MAC CE in a first format provided in an embodiment of this application. In Figure 2, each row represents a byte. The BSR shown in FIG. 2 includes M LCG identification fields, in order from LCG ID 1 to LCG ID M; M buffer size fields, buffer size field 1 to buffer size field M, respectively. Each LCG identification field is used to indicate the value of the corresponding LCG identification, where the bit width of the LCG identification field or the value range of the LCG identification field can be configured by the network or by the MAC subscript corresponding to the BSR MAC CE. The first predefined field in the header indicates or is determined according to the maximum value of the number of LCGs, which will not be repeated here.

In the BSR MAC CE of the first format shown in FIG. 2, the number of buffer size fields is less than or equal to the number of LCGs that need to transmit uplink data. The buffer size field i indicates the size of the uplink data to be transmitted in the LCG identifier corresponding to the LCG ID i, i=1, 2, 3,...,M.

Optionally, in the BSR MAC CE of the first format shown in FIG. 2, at least one reserved (reserved, R) domain may be included before the M LCG identification domains, which is reserved for future use.

It should be noted that the L field in the MAC subheader corresponding to the BSR MAC CE of the first format is optional, and the size of the BSR MAC CE indicated by the L field is also optional. If the BSR MAC CE is a fixed size, the L field is not required. Field indication, the L field may not exist at this time; if the BSR MAC CE has a variable size, the L field can be used to indicate the size of the BSR MAC CE, or the L field may not be used to indicate the size of the BSR MAC CE. The method shown in Figure 3 or Figure 4 is adopted, which will be described in detail below.

Exemplarily, as shown in FIG. 3, a schematic diagram of another BSR MAC CE in the first format provided in an embodiment of this application. The BSR MAC CE of the first format shown in Fig. 3 includes M LCG identification fields, in order from LCG ID 1 to LCG ID M; M buffer size fields, respectively, buffer size field 1 to buffer size Domain M; M flag fields, respectively F ₁ to F _M , the number of flag fields is the same as the number of LCG identification fields.

Each of the M flag fields is located before a pair of LCG flag fields and a buffer size field, and each flag field in the M flag fields is used to indicate a pair of LCG after the flag field The identification field and the buffer size field are the last pair of the LCG identification field and the buffer size field in the BSR MAC CE of the first format; or each of the M flag fields is used to indicate Whether there is another flag field and another pair of LCG identification field and buffer size field after the pair of LCG identification field and buffer size field after the flag field.

For example, the flag field includes 1 bit. When the flag field is 1, it means a pair of LCG flag field and buffer size field after the flag field, not the last pair of LCG in the first format BSR MAC CE Identification field and buffer size field; when the flag field is 0, it means that the pair of LCG identification field and buffer size field after the mark field is the last pair of LCG identification field and the buffer size field in the BSR MAC CE of the first format Buffer size field. At this time, in FIG. 3, the value of F ₁ to F _M-1 is 1, and the value of F _M is 0.

Optionally, in the BSR MAC CE of the first format shown in FIG. 3, before the M LCG identification domains, at least one R domain may be included, which is reserved for future use.

As another example, each of the M flag fields may also be located after a pair of LCG flag fields and buffer size fields. For details, refer to FIG. 4. At this time, each of the M flag fields is used to indicate whether a pair of LCG flag field and buffer size field before the flag field is the last in the BSR MAC CE of the first format A pair of LCG identification fields and buffer size fields; or each of the M flag fields is used to indicate whether there is another pair of LCG identification fields, buffer size fields and/or after the flag field Another logo domain. For example, the flag field includes 1 bit. When the flag field is 1, it means a pair of LCG flag field and buffer size field after the flag field, not the last pair of LCG in the first format BSR MAC CE Identification field and buffer size field; when the flag field is 0, it means that the pair of LCG identification field and buffer size field after the mark field is the last pair of LCG identification field and the buffer size field in the BSR MAC CE of the first format Buffer size field. At this time, in FIG. 4, the value of F ₁ to F _M-1 is 1, and the value of F _M is 0.

The above is just an example. There may be other possible implementations for the BSR MAC CE of the first format, which will not be repeated here.

In the embodiment of this application, when there are M LCGs to be transmitted with uplink data, the BSR MAC CE of the second format includes K LCG index fields and at most M buffer size fields; K is an integer greater than or equal to M.

Each LCG index field in the K LCG index fields uniquely indicates one LCG, and when one LCG index field in the K LCG index fields is a first preset value, it is used to indicate the relationship with the LCG index field The corresponding LCG has uplink data to be transmitted or the buffer size field used to indicate the LCG corresponding to the LCG index field is included in the BSR MAC CE; when one LCG index field in the K LCG index fields is When the second preset value is taken, it is used to indicate that there is no uplink data to be transmitted in the LCG corresponding to the LCG index field; each of the at most M buffer size fields uniquely indicates an LCG to be transmitted The size of the upstream data.

It should be noted that the bit width of the K LCG index fields or the value range of K means that the value range of the LCG identifier corresponding to the K LCG index fields is configured by the network or determined by the BSR MAC CE. The second predefined field in the MAC subheader indicates; or the value of K may be determined by a predefined manner in the protocol, for example, the value of K is the maximum value of the number of LCGs, which will not be repeated here.

For example, the BSR MAC CE in the second format may be as shown in FIG. 5. In Figure 5, each row represents a byte. The BSR MAC CE format shown in Figure 5 includes K LCG index fields, which are LCG _K-1 to LCG ₀ in order. Each LCG index field includes one bit. When an LCG index field is 1, it means that the LCG The LCG indicated by the index field has uplink data to be transmitted or the buffer size field corresponding to the LCG indicated by the LCG index field is included in the BSR MAC CE; when an LCG index field is 0, it means the LCG indicated by the LCG index field There is no uplink data to be transmitted.

The BSR MAC CE shown in FIG. 5 also includes M buffer size fields, which are buffer size field 1 to buffer size field M, respectively. The number of buffer size fields is less than or equal to the number of LCGs that actually need to transmit uplink data. The buffer size field i indicates the K LCG index fields from LCG _K-1 to LCG ₀ in the order, the i-th value is the LCG index field with the first preset value indicating the LCG to be transmitted upstream Data size, i=1, 2, 3,...,M. For example, the first LCG index field with a value of 1 from LCG _K-1 to LCG ₀ is LCG ₃ , and the buffer size field 1 indicates the size of the uplink data to be transmitted by the LCG indicated by LCG ₃ , or the buffer The size field i may also correspond to different LCG index fields according to other mapping rules, and the specific mapping method is not limited.

Optionally, in the BSR MAC CE shown in FIG. 5, before the K LCG index fields, at least one R field may be included, and the R field may be used as a reserved bit to be reserved for future use.

It should be noted that FIG. 5 is only an example, and the BSR MAC CE of the second format may also have other forms, which will not be repeated here.

In the embodiment of this application, the BSR MAC CE in the third format includes an LCG identification field and a buffer size field; the LCG identification field uniquely indicates an LCG to be transmitted uplink data, and the buffer size field is used to indicate The size of the uplink data to be transmitted by the LCG indicated by the LCG identifier field.

For example, the BSR MAC CE of the third format may be as shown in Figure 6. In Figure 6, each row represents a byte. The BSR shown in Figure 6 includes an LCG identification field, an LCG ID, and a buffer size field. The LCG identifier field is used to indicate the value of the corresponding LCG identifier.

In the embodiments of the present application, the first node may determine the format of the BSR MAC CE to be sent according to actual conditions, which are described separately below.

Refer to FIG. 7, which is a schematic flowchart of a method for transmitting a buffer status report according to an embodiment of this application. The first node may be a terminal side device or a wireless backhaul device. Specifically, the wireless backhaul device may be an IAB node or a relay device. When the first node is a terminal side device, the second node can be a network side device or a wireless backhaul device, etc.; when the first node is a wireless backhaul device, the second node can be a network side device or can be another wireless device. Return device. The method includes:

Step 701: the first node generates a MAC PDU including BSR MAC CE.

Step 702: The first node sends the MAC PDU to the second node.

Step 703: The second node receives the MAC PDU from the first node.

Step 704: The second node determines the size of the uplink data to be transmitted by the first node according to the MAC PDU.

In the BSR MAC CE, each buffer size field indicates the size of the uplink data to be transmitted by an LCG, so the second node can determine the size of the uplink data to be transmitted by the first node according to all the buffer size fields in the BSR MAC CE. Further optionally, the second node may also schedule a corresponding number of uplink resources for the first node, which is not limited in the embodiment of the present application.

In the embodiment of this application, before the first node generates the MAC PDU, the BSR is triggered. The conditions for the first node to trigger BSR may include the following conditions:

Condition 1: When all LCHs included in the LCGs of the first node have no uplink data to be sent, when any LCH belonging to any LCG has uplink data to be sent, the first node will trigger the BSR. A BSR that meets the first condition is called a regular BSR (Regular BSR).

Condition 2: In order to improve the robustness of the BSR, a mechanism for retransmitting the BSR is provided in the prior art to avoid the situation that the first node has sent the BSR but has not received the corresponding uplink grant (UpLink grant). Under this condition, the second node may configure a timer for the first node. When the timer times out and any LCH of any LCG of the first node has uplink data to be transmitted, the first node will Will trigger BSR. The BSR that meets the second condition is called a regular BSR.

Condition 3: The first node periodically updates the buffer state of the first node to the second node: The second node configures a periodic timer for the first node. If the periodic timer expires, the first node will Trigger BSR reporting. The BSR that meets the third condition is called a periodic BSR (Periodic BSR).

Condition 4: When the first node has uplink resources and it is determined that the data to be sent is not enough to fill the uplink resources, the extra bits are called padding bits. To this end, padding bits can be used to transmit BSR, which is called padding BSR (Padding BSR).

It should be noted that the above conditions are only examples, and the first node may also trigger the BSR according to other conditions, which will not be repeated here. When the first node triggers the BSR, it does not actually send the BSR, and the first node needs to obtain corresponding uplink resources to send the BSR.

When the first node generates a MAC PDU containing a BSR MAC CE, if there are M LCGs to be transmitted uplink data, and M is an integer greater than 0, the first node can determine the format of the BSR MAC CE according to M, which will be described separately below.

In the first possible implementation manner, when M is less than or equal to N, the format of the BSR MAC CE is the first format. The BSR MAC CE in the first format includes at most M pairs of LCG identification fields and buffer size fields.

For the specific implementation of the BSR MAC CE in the first format, please refer to FIG. 2 to FIG. 4. For the specific content, refer to the previous description of FIG. 2 to FIG. 4, which will not be repeated here.

Wherein, the value of N can be a value predefined by the protocol or can be configured by a network side device. As an example and not a limitation, N can be an integer greater than 1.

In this implementation, when the BSR MAC CE of the first format is used, X LCG identification fields do not need to be included. The value of X is the maximum number of LCGs defined in the system, so the bits occupied by BSR MAC CE can be reduced. Count, reduce the overhead of buffer status report.

Exemplarily, when the BSR is a regular BSR or a periodic BSR, the first node can report the size of the uplink data to be transmitted by M LCGs through the BSR. At this time, the BSR MAC CE in the first format includes the M pair LCG identification field and the buffer The area size field includes M LCG identification fields and M buffer size fields. One LCG identification field and one buffer size field correspond to one LCG.

Exemplarily, when the BSR MAC CE is transmitted using padding bits, that is, when the BSR included in the BSR MAC CE is a padding BSR, the number of padding bits is greater than or equal to the BSR MAC CE using the first format In the case of reporting the bit overhead required for the uplink data size of M LCGs to be transmitted, the first node can report the uplink data size of M LCGs to be transmitted through the BSR. In this case, the BSR MAC CE of the first format includes M The LCG identification domain and the buffer size domain include M LCG identification domains and M buffer size domains, and one LCG identification domain and one buffer size domain correspond to one LCG.

It should be noted that the bit overhead required to use the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by M LCGs includes the bit overhead required for M LCG identification fields and M buffer size fields, as well as The required bit overhead of the MAC subheader corresponding to the BSR MAC CE may also include the bit overhead required for M flag fields.

Exemplarily, when the BSR included in the BSR MAC CE is a padding BSR BSR, the number of padding bits is less than the bit overhead required for the BSR MAC CE of the first format to report the size of the uplink data to be transmitted for M LCGs In the case of, the first node may report the uplink data size of P LCGs to be transmitted through the BSR, and P is an integer less than M and greater than 0. At this time, the BSR MAC CE of the first format includes a P pair LCG identification field and a buffer size field, that is, includes P LCG identification fields and P buffer size fields. It should be noted that when the number of padding bits is less than the bit overhead required for the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by M LCGs, the reported BSR may be a truncation type BSR MAC CE format.

The value of P can be determined according to the number of padding bits. P is less than or equal to the maximum number of LCGs that can report uplink data to be transmitted when the first node transmits the BSR MAC CE in the first format through padding bits.

In the second possible implementation manner, when M is greater than N, the format of BSR MAC CE is the second format. The BSR MAC CE in the second format includes K LCG index fields and at most M buffer size fields.

For the specific implementation of the BSR MAC CE in the second format, refer to FIG. 5, and for specific content, refer to the previous description of FIG. 5, which will not be repeated here.

Exemplarily, when the BSR is a regular BSR or a periodic BSR, the first node can report the uplink data size of M LCGs to be transmitted through the BSR. At this time, the BSR MAC CE in the second format includes K LCG index fields and M Buffer size fields.

Exemplarily, when the BSR included in the BSR MAC CE is a padding BSR, when the number of padding bits is greater than or equal to that required for the BSR MAC CE using the second format to report the size of the uplink data to be transmitted for M LCGs In the case of bit overhead, the first node may report the size of the uplink data to be transmitted by M LCGs through the BSR. At this time, the BSR MAC CE in the second format includes K LCG index fields and M buffer size fields.

Exemplarily, when the BSR included in the BSR MAC CE is a padding BSR BSR, the number of padding bits is less than the bit overhead required for the BSR MAC CE of the second format to report the size of the uplink data to be transmitted for M LCGs In the case of, the first node may report the uplink data size of Q LCGs to be transmitted through the BSR, where Q is an integer less than M and greater than 0. At this time, the BSR MAC CE of the second format includes K LCG index fields and Q buffer size fields. It should be noted that when the number of padding bits is less than the bit overhead required for the BSR MAC CE of the second format to report the size of the uplink data to be transmitted by the M LCGs, the reported BSR may be a truncation type BSR MAC CE format.

The value of Q can be determined according to the number of padding bits. Q is less than or equal to the maximum number of LCGs that can report uplink data to be transmitted when the first node transmits the BSR MAC CE of the second format through padding bits.

It should be noted that in the first possible implementation manner, when M is less than N, the format of BSR MAC CE is the first format; correspondingly, in the second possible implementation manner, when M is greater than or equal to N At this time, the format of BSR MAC CE is the second format. Other content remains unchanged, so I won't repeat it here.

In the third possible implementation manner, when M is equal to 1, the format of the BSR MAC CE may be the first format or the third format.

For the specific implementation of the BSR MAC CE in the third format, refer to FIG. 6, and for specific content, refer to the previous description of FIG. 6, which will not be repeated here.

In this implementation manner, when the BSR MAC CE of the third format is adopted, only one LCG identification field is included, so the number of bits occupied by the BSR MAC CE can be reduced, and the overhead of the buffer status report can be reduced.

It should be noted that the first possible implementation manner, the second possible implementation manner, and the third possible implementation manner described above can be used alone or in combination, which is not limited in the embodiments of the present application.

In the embodiment of this application, for filling the BSR, a method for determining the format of the BSR MAC CE is also provided. Refer to FIG. 8, which is a schematic flowchart of a method for transmitting a buffer status report according to an embodiment of this application. The first node may be a terminal side device or a wireless backhaul device. Specifically, the wireless backhaul device may be an IAB node or a relay device. When the first node is a terminal side device, the second node can be a network side device or a wireless backhaul device, etc.; when the first node is a wireless backhaul device, the second node can be a network side device or can be another wireless device. Return device. The method includes:

Step 801: When the first node determines that there are M LCGs to be transmitted uplink data and padding bits, it generates a MAC PDU including BSR MAC CE according to the number of padding bits.

Step 802: The first node sends the MAC PDU to the second node.

Step 803: The second node receives the MAC PDU from the first node.

Step 804: The second node determines the size of the uplink data to be transmitted by the first node according to the MAC PDU.

When the first node generates a MAC PDU containing the BSR MAC CE corresponding to the BSR, if there are M LCGs to be transmitted for uplink data, the first node can determine the format of the BSR MAC CE according to the number of stuffing bits, which will be described separately below.

In the first possible implementation manner, if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first format. The BSR MAC CE in the first format includes at most M pairs of LCG identification fields and buffer size fields.

Further, the number of padding bits is less than a first preset threshold, and the number of padding bits is greater than or equal to the size of the uplink data to be transmitted for the M LCGs reported by the BSR MAC CE using the first format When the required bit overhead is required, the first node can report the size of the uplink data to be transmitted by M LCGs through the BSR. At this time, the BSR MAC CE of the first format includes the M pair LCG identification field and the buffer size field, which includes M LCG identification fields and M buffer size fields, one LCG identification field and one buffer size field correspond to one LCG.

It should be noted that the first preset threshold value may be predefined or configurable, and will not be repeated here.

Further, the number of padding bits is less than a first preset threshold, and the number of padding bits is less than that required by the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by the M LCGs In the case of bit overhead, the first node can report the uplink data size of P LCGs to be transmitted through the BSR, and P is an integer less than M and greater than 0. At this time, the BSR MAC CE of the first format includes a P pair LCG identification field and a buffer size field, that is, includes P LCG identification fields and P buffer size fields. It should be noted that when the number of padding bits is less than the bit overhead required for the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by M LCGs, the reported BSR may be a truncation type BSR MAC CE format.

In the second possible implementation manner, if the number of padding bits is greater than or equal to the first preset threshold, the format of the BSR MAC CE is the second format, and the BSR MAC CE of the second format includes K LCG index fields and at most M buffer size fields.

Further, when the number of stuffing bits is greater than or equal to the first preset threshold, and the number of stuffing bits is greater than or equal to the BSR MAC CE using the second format to report M LCGs to be transmitted When the bit overhead required for the uplink data size is required, the BSR MAC CE of the second format includes K LCG index fields and M buffer size fields.

Further, when the number of padding bits is greater than or equal to the first preset threshold, and the number of padding bits is less than the BSR MAC CE using the second format to report M uplink data to be transmitted by the LCG In terms of the bit overhead required by the size, the BSR MAC CE of the second format includes K LCG index fields and Q buffer size fields, and Q is an integer less than M and greater than 0. In this case, the second format may be referred to as a truncated second format.

It should be noted that in the first possible implementation manner, when the number of padding bits is less than or equal to the first preset threshold, the format of BSR MAC CE is the first format; correspondingly, the second possibility In the implementation manner of, when the number of padding bits is greater than the first preset threshold, the format of the BSR MAC CE is the second format. Other content remains unchanged, so I won't repeat it here.

In the third possible implementation manner, when M is equal to 1, the format of the BSR MAC CE may be the first format or the third format. For the specific implementation of the BSR MAC CE in the third format, refer to FIG. 6, and for specific content, refer to the previous description of FIG. 6, which will not be repeated here.

It should be noted that the LCG identifier or the LCG index involved in the foregoing embodiment is applicable to the BSR scheme that reports with the granularity of LCG. When LCH granularity or RLC channel or RLC bearer granularity is used for BSR reporting, the above LCG identifier or LCG index can also be equivalently replaced with LCH identifier, LCG index or RLC channel identifier, RLC channel index or RLC bearer identifier, RLC bearer index.

In the IAB network, for the backhaul link between two IAB nodes, the scheduling of the downlink transmission of the backhaul link is completed by the parent node of the two IAB nodes. One way to achieve this is that the parent of the two IAB nodes The node sends downlink scheduling information to the child node to complete the scheduling of the downlink resources of the backhaul link; for the access link between the UE and the IAB node, the scheduling of the access link downlink transmission is completed by the IAB node. One way to achieve this is The IAB node sends downlink scheduling information to the UE to complete the scheduling of the access link downlink resources. However, for the downlink transmission of the access link or the backhaul link, each IAB node needs to comprehensively consider the various quality of service (QoS) requirement parameters of various downlink services and the downlink Factors such as channel conditions and quality. For the signalling radio bearer (DRB) of a specific terminal-side device, its QoS requirement parameters are fixed, and it is an end-to-end QoS requirement (from the host node or core network side to the terminal-side device QoS requirements). Moreover, in the prior art, each IAB node can only see the above-mentioned end-to-end QoS requirement parameter.

For example, QoS requirement parameters mainly include the following:

Guaranteed Bit Rate (Guaranteed Bit Rate, GBR): The bit rate that needs to be guaranteed;

Maximum bit rate (Maximum Flow Bit Rate);

Packet Delay Budget (PDB): Data packet transmission and delay upper limit requirements for each business;

Packet Error Rate (PER);

Maximum packet loss rate (Maximum Packet Loss Rate);

QoS priority level (QoS Priority Level).

As an example and not a limitation, the QoS requirement parameter may also be other requirement parameters in the data transmission process.

In the IAB network, the terminal-side device and the IAB node are called the access link, and the IAB node and the IAB and the host node are called the backhaul link. The DRB of each terminal-side device can be separately transmitted on the backhaul link using a radio link control (RLC) channel of the backhaul link, or multiple DRBs of a terminal-side device or Multiple DRBs of multiple terminal-side devices can be aggregated on an RLC channel of the backhaul link for transmission.

In the downlink scheduling process, it is inaccurate to make scheduling decisions through an end-to-end QoS requirement parameter when the IAB node is scheduling. In other words, in the process of multi-hop transmission, an end-to-end QoS requirement parameter needs to be met in multi-hop transmission. For example, taking PDB as an example, if the end-to-end PDB requirement is 100 ms, there are a total of 5 hops. For the actual scheduling of each hop, the IAB node prefers to see a decomposed PDB demand, rather than a total of 100ms.

In order to solve the foregoing problem, in the embodiment of the present application, the scheduling fairness of the backhaul link can be optimized through the unified coordination configuration of the host node, which is described in detail below.

Step 1: The host node receives measurement or feedback information from the first IAB node, and determines each RLC channel between the first IAB node and the second IAB node or between the first IAB node and the second IAB node according to the measurement or feedback information The adjustment factor of at least one QoS requirement parameter of each terminal-side device DRB transmitted between nodes. The first IAB node is the parent node of the second IAB node, and the terminal side device is a terminal side device served by the second IAB node or a terminal side served by an IAB node subordinate to the second IAB node equipment.

In step 1, the adjustment factor of at least one QoS requirement parameter of each terminal-side device DRB between the first IAB node and the terminal-side device may also be determined according to the measurement or feedback information. Wherein, the terminal side device is a terminal side device served by the first IAB node.

It should be noted that the first step is an optional step, and the adjustment factor can be a preset value or determined by other means, and will not be repeated here.

Step 2: The host node sends a configuration/reconfiguration message to the first IAB node, where the configuration/reconfiguration message includes at least one RLC channel between the first IAB node and the second IAB node between the first IAB node and the second IAB node The adjustment factor of at least one QoS requirement parameter of at least one terminal-side device DRB transmitted between. The first IAB node is the parent node of the second IAB node, and the terminal side device is a terminal side device served by the second IAB node or a terminal side served by an IAB node subordinate to the second IAB node equipment.

In step 2, the host node may also configure the first IAB node with the configuration/reconfiguration message to the first IAB node to configure the adjustment factor of at least one QoS requirement parameter of at least one terminal-side device DRB between the first IAB node and the terminal-side device . Wherein, the terminal side device is a terminal side device served by the first IAB node.

It should be noted that the QoS requirement parameter can be one or more of the following parameters: guaranteed bit rate, maximum bit rate, data packet delay budget, data packet error rate, maximum data packet loss rate, QoS priority Grade etc.

Since the host node has the mapping relationship between the UE DRB and RLC channel between all IAB nodes under it, and the QoS requirements of each terminal-side device DRB are fixed, and the host node knows the QoS of each terminal-side device DRB demand.

In order to ensure that the QoS requirements of each terminal-side device DRB on the entire link from the host node to the terminal-side device can be met, it is necessary to configure or configure according to the actual situation of each backhaul link or access link. Change part of the QoS requirement information of each link.

Optionally, the host node may be a centralized unit (CU) and a distributed unit (DU) in a separate form, and the IAB node may include at least one mobile terminal (MT) unit and at least one distributed unit Distributed unit (DU), therefore, the CU of the host node may send a configuration message to the first IAB node. The message can be carried on the F1 application layer protocol (F1 application protocol, F1-AP) message between the CU of the host node and the first IAB node DU, or it can be carried on the radio between the CU of the host node and the first IAB node MT. On a resource control (radio resource control, RRC) message.

Step 3: The first IAB node receives the adjustment factor of the at least one QoS requirement parameter, and performs downlink scheduling according to the QoS requirement parameter adjusted by the adjustment factor of the at least one QoS requirement parameter.

As a possible example, the first IAB node may multiply the adjustment factor of the QoS requirement parameter by the corresponding end-to-end QoS requirement parameter to determine the QoS requirement parameter of each downlink transmission link and complete the downlink scheduling.

For example, when the host node receives the measurement or feedback information of all nodes on the entire routing path from it to the terminal-side device, it allocates an adjustment factor of QoS requirement parameters for each access link and backhaul link Taking PDB as an example, the entire routing path is 100ms, and there are four hops in total. You can configure an adjustment factor for each path: 0.2+0.2+0.3+0.3=1 (the sum is equal to 1, which is the total end-to-end QoS requirement), for a certain IAB node, the PDB requirement of the downlink between the IAB node and the child node or terminal side device is determined by the value of the received adjustment factor. For example, when the received adjustment factor value is At 0.2, the IAB node determines that the downlink demand between it and the child node or terminal side device is 20ms.

As shown in FIG. 9, a schematic structural diagram of a communication device provided in an embodiment of this application. The communication device may be used to perform actions of the first node and the second node in the foregoing method embodiments. The communication device 900 includes a transceiver unit 901 and a processing unit 902.

When the communication device 900 executes the actions of the first node in the flow shown in FIG. 7:

The processing unit 902 is configured to generate a MAC PDU including BSR MAC CE;

Wherein, the number of logical channel group LCGs to be transmitted uplink data is M, if M is less than or equal to N, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG The identification field and the buffer size field, M is an integer greater than 0, and N is an integer greater than 1. The at most M pairs of LCG identification fields and buffer size fields in each LCG identification field uniquely indicate a piece of uplink data to be transmitted LCG, each buffer size field in the at most M pairs of LCG identification field and buffer size field uniquely indicates the uplink data size of an LCG to be transmitted for uplink data;

The transceiver unit 901 is configured to send the MAC PDU to the second node.

When the communication device 900 executes the actions of the second node in the flow shown in FIG. 7:

The transceiver unit 901 is configured to receive a MAC PDU from the first node; the MAC PDU includes a BSR MAC CE;

Wherein, the number of logical channel group LCGs to be transmitted uplink data is M, if M is less than or equal to N, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG The identification field and the buffer size field, M is an integer greater than 0; each LCG identification field in the at most M pairs of LCG identification fields and the buffer size field uniquely indicates an LCG to be transmitted uplink data, and the at most M pairs Each buffer size field in the LCG identification field and the buffer size field uniquely indicates the uplink data size of an LCG to be transmitted for uplink data;

The processing unit 902 is configured to determine the size of the uplink data to be transmitted by the first node according to the MAC PDU.

When the communication device 900 executes the actions of the first node in the flow shown in FIG. 8:

The processing unit 902 is configured to determine that there are M logical channel groups LCG to be transmitted uplink data and padding bits, then generate a MAC PDU including BSR MAC CE according to the number of padding bits;

Wherein, the number of logical channel groups LCG to be transmitted uplink data is M, if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first format, and the first format The BSR MAC CE includes at most M pairs of LCG identification fields and buffer size fields, where M is an integer greater than 0; each of the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an uplink to be transmitted For the LCG of the data, each buffer size field in the at most M pairs of LCG identification fields and buffer size fields uniquely indicates the uplink data size to be transmitted by an LCG for which uplink data is to be transmitted;

The transceiver unit 901 is configured to send the MAC PDU to the second node.

When the communication device 900 executes the actions of the second node in the flow shown in FIG. 8:

The transceiver unit 901 is configured to receive a media access control MAC protocol data unit PDU from the first node; the MAC PDU includes a buffer status report BSR media access control MAC control element CE;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application. The communication device shown in FIG. 10 may be a hardware circuit implementation of the communication device shown in FIG. 9. The communication device can be applied to the flowcharts shown in FIGS. 7 to 8 to perform the functions of the first node and the second node in the foregoing method embodiment. For ease of description, FIG. 10 only shows the main components of the communication device. As shown in FIG. 10, the communication device 1000 includes a processor 1001, a memory 1002, a communication interface 1003, and the like.

The processor 1001 is mainly used to process communication protocols and communication data, and to control the entire wireless communication device, execute software programs, and process data of the software programs, for example, to support the wireless communication device to execute the methods described in the above method embodiments Action etc. The memory 1002 is mainly used to store software programs and data. The communication interface 1003 is mainly used for functions such as conversion of baseband signals and radio frequency signals, and processing of radio frequency signals.

In the embodiment of the present application, in addition, for the specific actions performed by the processor 1001 and the communication interface 1003 in the communication device 1000, reference may be made to the descriptions in the foregoing method embodiments, and details are not repeated here.

Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program codes.

This application is described with reference to flowcharts and/or block diagrams of methods, equipment (systems), and computer program products according to this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

A method for transmitting a buffer status report, which is characterized in that it comprises:

The first node generates a MAC protocol data unit PDU including a buffer status report BSR media access control MAC control element CE;

Wherein, the number of logical channel group LCGs to be transmitted uplink data is M, if M is less than or equal to N, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG The identification field and the buffer size field, M is an integer greater than 0, and N is an integer greater than 1. The at most M pairs of LCG identification fields and buffer size fields in each LCG identification field uniquely indicate a piece of uplink data to be transmitted LCG, each buffer size field in the at most M pairs of LCG identification field and buffer size field uniquely indicates the uplink data size of an LCG to be transmitted for uplink data;

The first node sends the MAC PDU to the second node.
The method according to claim 1, wherein if M is greater than N, the format of the BSR MAC CE is the second format, and the BSR MAC CE of the second format includes K LCG index fields and at most M buffers Area size field; each LCG index field in the K LCG index fields uniquely indicates one LCG;

When one LCG index field in the K LCG index fields is the first preset value, it is used to indicate that the LCG corresponding to the LCG index field has uplink data to be transmitted or is used to indicate that it corresponds to the LCG index field The buffer size field of the LCG is included in the BSR MAC CE; or,

When one LCG index field in the K LCG index fields is a second preset value, it is used to indicate that the LCG corresponding to the LCG index field does not have uplink data to be transmitted;

Wherein, each of the at most M buffer size fields uniquely indicates the size of the uplink data to be transmitted by an LCG; K is an integer greater than or equal to M, and K is the maximum value of the number of LCGs or a predefined or Value configured on the network side.
The method according to claim 1 or 2, wherein the BSR MAC CE includes a BSR, and when the BSR is a regular BSR or a periodic BSR, the BSR MAC CE in the first format includes the M vs. LCG identifier Domain and buffer size domain.
The method according to claim 2, wherein the BSR MAC CE includes a BSR, and when the BSR is a regular BSR or a periodic BSR, the BSR MAC CE in the second format includes K LCG index fields and M buffer size fields.
The method according to claim 1, wherein the BSR MAC CE is transmitted using padding bits, and the BSR included in the BSR MAC CE is a padding BSR;

When M is less than or equal to N, and the number of padding bits is greater than or equal to the bit overhead required by the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by M LCGs, the BSR MAC CE includes M to LCG identification field and buffer size field;

Or, when M is less than or equal to N, and the number of padding bits is less than the bit overhead required for using the BSR MAC CE of the first format to report the size of the uplink data to be transmitted for M LCGs, the BSR of the first format The MAC CE includes the P pair LCG identification field and the buffer size field. P is an integer less than M and greater than 0.
The method according to claim 2, wherein the BSR MAC CE is transmitted using padding bits, and the BSR included in the BSR MAC CE is a padding BSR;

When M is greater than N, and the number of padding bits is greater than or equal to the bit overhead required to use the BSR MAC CE of the second format to report the size of the uplink data to be transmitted for M LCGs, the BSR MAC of the second format CE includes K LCG index fields and M buffer size fields;

Or, when M is greater than N, and the number of padding bits is less than the bit overhead required for the BSR MAC CE of the second format to report the size of the uplink data to be transmitted for M LCGs, the BSR MAC of the second format The CE includes K LCG index fields and Q buffer size fields, and Q is an integer less than M and greater than 0.
The method according to claim 1, wherein the BSR MAC CE of the first format further includes at most M flag fields;

Each of the at most M flag fields is located before a pair of the LCG flag field and the buffer size field, and each of the at most M flag fields is used to indicate the one after the flag field. For the LCG identification field and the buffer size field, whether it is the last pair of the LCG identification field and the buffer size field in the BSR MAC CE of the first format;

Alternatively, each of the at most M flag fields is located after a pair of LCG flag fields and buffer size fields, and each of the at most M flag fields is used to indicate that it is before the flag field Whether the pair of LCG identification field and buffer size field in the first format is the last pair of LCG identification field and buffer size field in the BSR MAC CE of the first format.
The method according to any one of claims 1-6, wherein the MAC subheader corresponding to the BSR MAC CE includes a format field, and the format field is used to indicate the format of the BSR MAC CE.
The method according to any one of claims 1-8, wherein the bit width of the LCG identification field or the value range of the LCG identification field is configured by the network or by the MAC subheader corresponding to the BSR MAC CE Indicates the first predefined field in.
The method according to claim 2, wherein the bit width of the K LCG index fields or the value range of the LCG identifier corresponding to the K LCG index fields are configured by the network or corresponded by the BSR MAC CE The second predefined field in the MAC subheader indicates.
A method for transmitting a buffer status report, which is characterized in that it comprises:

The second node receives the media access control MAC protocol data unit PDU from the first node; the MAC PDU includes a buffer status report BSR media access control MAC control element CE;

Wherein, the number of logical channel group LCGs to be transmitted uplink data is M, if M is less than or equal to N, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG The identification field and the buffer size field, M is an integer greater than 0; each LCG identification field in the at most M pairs of LCG identification fields and the buffer size field uniquely indicates an LCG to be transmitted uplink data, and the at most M pairs Each buffer size field in the LCG identification field and the buffer size field uniquely indicates the uplink data size of an LCG to be transmitted for uplink data;

The second node determines the size of the uplink data to be transmitted by the first node according to the MAC PDU.
A method for transmitting a buffer status report, which is characterized in that it comprises:

When the first node determines that there are M logical channel groups LCG to be transmitted uplink data and stuffing bits, it generates a MAC protocol data unit PDU containing a buffer status report BSR media access control MAC control element CE according to the number of the stuffing bits ；

Wherein, if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG identification fields and buffer size Field, M is an integer greater than 0; each LCG identification field in the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an LCG of uplink data to be transmitted, and the at most M pairs of LCG identification fields and buffers Each buffer size field in the size field uniquely indicates the uplink data size to be transmitted by an LCG for which uplink data is to be transmitted;

The first node sends the MAC PDU to the second node.
The method according to claim 12, wherein if the number of padding bits is greater than or equal to the first preset threshold, the format of the BSR MAC CE is a second format, and the second format is The format of BSR MAC CE includes K LCG index fields and at most M buffer size fields;

Each LCG index field in the K LCG index fields uniquely indicates one LCG, and when one LCG index field in the K LCG index fields is a first preset value, it is used to indicate the relationship with the LCG index field The corresponding LCG has uplink data to be transmitted or the buffer size field used to indicate the LCG corresponding to the LCG index field is included in the BSR MAC CE; when one LCG index field in the K LCG index fields is When the second preset value is taken, it is used to indicate that there is no uplink data to be transmitted in the LCG corresponding to the LCG index field; each of the at most M buffer size fields uniquely indicates an LCG to be transmitted The size of the uplink data; K is an integer greater than or equal to M, and K is the maximum number of LCGs or a value pre-defined or configured on the network side.
The method according to claim 12 or 13, wherein if the number of padding bits is less than a first preset threshold, and the number of padding bits is greater than or equal to the BSR MAC using the first format When the CE reports the bit overhead required for the size of the uplink data to be transmitted by the M LCGs, the BSR MAC CE in the first format includes an M pair LCG identification field and a buffer size field;

Alternatively, if the number of padding bits is less than the first preset threshold, and the number of padding bits is less than that required by the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by the M LCGs In the case of bit overhead, the BSR MAC CE in the first format includes a P to LCG identification field and a buffer size field, and P is an integer less than M and greater than 0.
The method according to claim 13, wherein when the number of padding bits is greater than or equal to the first preset threshold, and the number of padding bits is greater than or equal to that using the second format When the BSR MAC CE reports the bit overhead required for the uplink data size of M LCGs to be transmitted, the BSR MAC CE of the second format includes K LCG index fields and M buffer size fields;

Or, when the number of padding bits is greater than or equal to the first preset threshold, and the number of padding bits is less than the size of the uplink data to be transmitted for M LCGs reported by the BSR MAC CE using the second format When the bit overhead is required, the BSR MAC CE in the second format includes K LCG index fields and Q buffer size fields, and Q is an integer less than M and greater than 0.
A method for transmitting a buffer status report, which is characterized in that it comprises:

The second node receives a media access control MAC protocol data unit PDU from the first node; the MAC PDU includes a buffer status report BSR media access control MAC control element CE;

Wherein, the number of logical channel groups LCG to be transmitted uplink data is M, if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first format, and the first format The BSR MAC CE includes at most M pairs of LCG identification fields and buffer size fields, where M is an integer greater than 0; each of the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an uplink to be transmitted For the LCG of the data, each buffer size field in the at most M pairs of LCG identification fields and buffer size fields uniquely indicates the uplink data size to be transmitted by an LCG for which uplink data is to be transmitted;

The second node determines the size of the uplink data to be transmitted by the first node according to the MAC PDU.
A communication device, characterized by comprising:

The processing unit is used to generate a MAC protocol data unit PDU including a buffer status report BSR media access control MAC control element CE;

Wherein, the number of logical channel group LCGs to be transmitted uplink data is M, if M is less than or equal to N, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG The identification field and the buffer size field, M is an integer greater than 0, and N is an integer greater than 1. The at most M pairs of LCG identification fields and buffer size fields in each LCG identification field uniquely indicate a piece of uplink data to be transmitted LCG, each buffer size field in the at most M pairs of LCG identification field and buffer size field uniquely indicates the uplink data size of an LCG to be transmitted for uplink data;

The transceiver unit is configured to send the MAC PDU to the second node.
The apparatus according to claim 17, wherein if M is greater than N, the format of the BSR MAC CE is the second format, and the BSR MAC CE of the second format includes K LCG index fields and at most M buffers Area size field; each LCG index field in the K LCG index fields uniquely indicates one LCG;

When one LCG index field in the K LCG index fields is the first preset value, it is used to indicate that the LCG corresponding to the LCG index field has uplink data to be transmitted or is used to indicate that it corresponds to the LCG index field The buffer size field of the LCG is included in the BSR MAC CE; or,

When one LCG index field in the K LCG index fields is a second preset value, it is used to indicate that the LCG corresponding to the LCG index field does not have uplink data to be transmitted;

Wherein, each of the at most M buffer size fields uniquely indicates the size of the uplink data to be transmitted by an LCG; K is an integer greater than or equal to M, and K is the maximum value of the number of LCGs or a predefined or Value configured on the network side.
The device according to claim 17 or 18, wherein the BSR MAC CE includes a BSR, and when the BSR is a regular BSR or a periodic BSR, the BSR MAC CE in the first format includes an M vs. LCG identifier Domain and buffer size domain.
The apparatus according to claim 18, wherein the BSR MAC CE includes a BSR, and when the BSR is a regular BSR or a periodic BSR, the BSR MAC CE of the second format includes K LCG index fields and M buffer size fields.
The apparatus according to claim 17, wherein the BSR MAC CE is transmitted using padding bits, and the BSR included in the BSR MAC CE is a padding BSR;

When M is less than or equal to N, and the number of padding bits is greater than or equal to the bit overhead required by the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by M LCGs, the BSR MAC CE includes M to LCG identification field and buffer size field;

Or, when M is less than or equal to N, and the number of padding bits is less than the bit overhead required for using the BSR MAC CE of the first format to report the size of the uplink data to be transmitted for M LCGs, the BSR of the first format The MAC CE includes the P pair LCG identification field and the buffer size field. P is an integer less than M and greater than 0.
The apparatus according to claim 18, wherein the BSR MAC CE is transmitted by filling bits, and the BSR included in the BSR MAC CE is a filling BSR;

When M is greater than N, and the number of padding bits is greater than or equal to the bit overhead required by the CE to report the size of the uplink data to be transmitted for M LCGs using the BSR MAC of the second format, the BSR MAC of the second format CE includes K LCG index fields and M buffer size fields;

Or, when M is greater than N, and the number of padding bits is less than the bit overhead required for the BSR MAC CE of the second format to report the size of the uplink data to be transmitted for M LCGs, the BSR MAC of the second format The CE includes K LCG index fields and Q buffer size fields, and Q is an integer less than M and greater than 0.
The apparatus according to claim 17, wherein the BSR MAC CE of the first format further includes at most M flag fields;

Each of the at most M flag fields is located before a pair of the LCG flag field and the buffer size field, and each of the at most M flag fields is used to indicate the one after the flag field. For the LCG identification field and the buffer size field, whether it is the last pair of the LCG identification field and the buffer size field in the BSR MAC CE of the first format;

Alternatively, each of the at most M flag fields is located after a pair of LCG flag fields and buffer size fields, and each of the at most M flag fields is used to indicate that it is before the flag field Whether the pair of LCG identification field and buffer size field in the first format is the last pair of LCG identification field and buffer size field in the BSR MAC CE of the first format.
The apparatus according to any one of claims 17-23, wherein the MAC subheader corresponding to the BSR MAC CE includes a format field, and the format field is used to indicate the format of the BSR MAC CE.
A communication device, characterized by comprising:

The transceiver unit is configured to receive a media access control MAC protocol data unit PDU from the first node; the MAC PDU includes a buffer status report BSR media access control MAC control element CE;

Wherein, the number of the logical channel group LCG to be transmitted uplink data is M, if M is less than or equal to N, the format of the BSRMAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG identifiers Field and buffer size field, M is an integer greater than 0; each LCG identification field in the at most M pairs of LCG identification field and buffer size field uniquely indicates an LCG of uplink data to be transmitted, and the at most M pairs of LCG Each buffer size field in the identification field and the buffer size field uniquely indicates the uplink data size to be transmitted by an LCG for which uplink data is to be transmitted;

The processing unit is configured to determine the size of the uplink data to be transmitted by the first node according to the MAC PDU.
A communication device, characterized by comprising:

The processing unit is used to determine that there are M logical channel groups LCG for uplink data to be transmitted and stuffing bits, then generate MAC protocol data including a buffer status report BSR media access control MAC control element CE according to the number of stuffing bits Unit PDU;

Wherein, if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first format, and the BSR MAC CE of the first format includes at most M pairs of LCG identification fields and buffer size Field, M is an integer greater than 0; each LCG identification field in the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an LCG of uplink data to be transmitted, and the at most M pairs of LCG identification fields and buffers Each buffer size field in the size field uniquely indicates the uplink data size to be transmitted by an LCG for which uplink data is to be transmitted;

The transceiver unit is configured to send the MAC PDU to the second node.
The apparatus according to claim 26, wherein if the number of padding bits is greater than or equal to the first preset threshold, the format of the BSR MAC CE is a second format, and the second format is The format of BSR MAC CE includes K LCG index fields and at most M buffer size fields;

Each LCG index field in the K LCG index fields uniquely indicates one LCG, and when one LCG index field in the K LCG index fields is a first preset value, it is used to indicate the relationship with the LCG index field The corresponding LCG has uplink data to be transmitted or the buffer size field used to indicate the LCG corresponding to the LCG index field is included in the BSR MAC CE; when one LCG index field in the K LCG index fields is When the second preset value is taken, it is used to indicate that there is no uplink data to be transmitted in the LCG corresponding to the LCG index field; each of the at most M buffer size fields uniquely indicates an LCG to be transmitted The size of the uplink data; K is an integer greater than or equal to M, and K is the maximum number of LCGs or a value pre-defined or configured on the network side.
The device according to claim 26 or 27, wherein if the number of padding bits is less than a first preset threshold, and the number of padding bits is greater than or equal to the BSR MAC using the first format When the CE reports the bit overhead required for the size of the uplink data to be transmitted by the M LCGs, the BSR MAC CE in the first format includes an M pair LCG identification field and a buffer size field;

Alternatively, if the number of padding bits is less than the first preset threshold, and the number of padding bits is less than that required by the BSR MAC CE of the first format to report the size of the uplink data to be transmitted by the M LCGs In the case of bit overhead, the BSR MAC CE in the first format includes a P to LCG identification field and a buffer size field, and P is an integer less than M and greater than 0.
28. The device according to claim 27, wherein when the number of padding bits is greater than or equal to the first preset threshold, and the number of padding bits is greater than or equal to that using the second format When the BSR MAC CE reports the bit overhead required for the uplink data size of M LCGs to be transmitted, the BSR MAC CE of the second format includes K LCG index fields and M buffer size fields;

Or, when the number of padding bits is greater than or equal to the first preset threshold, and the number of padding bits is less than the size of the uplink data to be transmitted for M LCGs reported by the BSR MAC CE using the second format When the bit overhead is required, the BSR MAC CE in the second format includes K LCG index fields and Q buffer size fields, and Q is an integer less than M and greater than 0.
A communication device, characterized by comprising:

The transceiver unit is configured to receive a media access control MAC protocol data unit PDU from the first node; the MAC PDU includes a buffer status report BSR media access control MAC control element CE;

Wherein, the number of logical channel groups LCG to be transmitted uplink data is M, if the number of padding bits is less than the first preset threshold, the format of the BSR MAC CE is the first format, and the first format The BSR MAC CE includes at most M pairs of LCG identification fields and buffer size fields, where M is an integer greater than 0; each of the at most M pairs of LCG identification fields and buffer size fields uniquely indicates an uplink to be transmitted For the LCG of the data, each buffer size field in the at most M pairs of LCG identification fields and buffer size fields uniquely indicates the uplink data size to be transmitted by an LCG for which uplink data is to be transmitted;

The processing unit is configured to determine the size of the uplink data to be transmitted by the first node according to the MAC PDU.
A buffer status report transmission device, characterized in that it comprises a processor, which is coupled with the memory:

The processor is configured to execute a computer program or instruction stored in the memory, so that the device executes the method according to any one of claims 1 to 10.
A buffer status report transmission device, characterized in that it comprises a processor, which is coupled with the memory:

The processor is configured to execute a computer program or instruction stored in the memory, so that the device executes the method according to any one of claims 12 to 15.