# US 10,873,965 B2 · Method for transmitting a buffer status report in a wireless communication system and device therefor

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- Number: US 10,873,965 B2
- Document ID: US10873965B2
- Status: Granted
- Kind: B2
- Application number: 16/318,112
- Filed: 2017-08-04
- Published: 2019-08-15
- Granted: 2020-12-22
- Earliest claimed: 2016-08-04
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seungjune Yi; Sunyoung Lee
- Web page: https://patentgrep.com/patent/US10873965B2

## CPC

- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 28/0252: {per individual bearer or channel (dynamic wireless traffic scheduling H04W72/12)}
- H04W 28/0278: {using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12)}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting, by a user equipment (UE), a buffer status report in a wireless communication system, the method comprising: receiving, by the UE, a message including information on a number N of lower entities to report an upper entity buffer size of a radio bearer; and transmitting, by N lower entities, the buffer status report including the upper entity buffer size, wherein the radio bearer comprises one upper entity and M lower entities, and wherein N≤M.

## Claims

### Claim 1

A method for transmitting, by a user equipment (UE), a buffer status report in a wireless communication system, the method comprising:
receiving, by the UE, a message including information on a number N of lower entities to report an upper entity buffer size of a radio bearer; and
transmitting the buffer status report to each of M scheduling nodes,
wherein the UE is scheduled by the M scheduling nodes,
wherein the radio bearer comprises one upper entity and M lower entities, and the M lower entities are comprised in the radio bearer based on the M scheduling nodes,
wherein the buffer status report transmitted to each of the M scheduling nodes comprises a first buffer status report transmitted by N lower entities of the M lower entities and that includes the upper entity buffer size and a corresponding lower entity buffer size, and a second buffer status report that is transmitted by M−N lower entities other than the N lower entities and that includes the corresponding lower entity buffer size, and
wherein N≤M, and M is larger than two.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
based on uplink data being available for transmission in the upper entity, indicating, by the upper entity, the upper entity buffer size to the N lower entities.

### Claim 3 (depends on 2)

The method of claim 2, wherein the upper entity indicates the upper entity buffer size as zero to the M−N lower entities other than the N lower entities.

### Claim 4 (depends on 1)

The method of claim 1, wherein the message further includes identity information for the N lower entities.

### Claim 5 (depends on 1)

The method of claim 1,
wherein the message further includes information on a first upper entity buffer size threshold value associated with N,
wherein based on the upper entity buffer size being larger than or equal to the first upper entity buffer size threshold value, the N lower entities transmit the buffer status report including the upper entity buffer size, and
wherein based on the upper entity buffer size being less than the first upper entity buffer size threshold value, the M lower entities transmit the buffer status report not including the upper entity buffer size.

### Claim 6 (depends on 5)

The method of claim 5,
wherein the message further includes information on a number N1 of lower entities to report the upper entity buffer size and a second upper entity buffer size threshold value associated with N1,
wherein N≠N1 and the second upper entity buffer size threshold value is larger than the first upper entity buffer size threshold value, and
wherein based on the upper entity buffer size being larger than or equal to the second upper entity buffer size threshold value, the N1 lower entities transmit the buffer status report including the upper entity buffer size.

### Claim 7 (depends on 1)

The method of claim 1, wherein:
the upper entity corresponds to a packet data convergence protocol (PDCP) entity, and
the lower entity corresponds to a Medium access control (MAC) entity.

### Claim 8 (depends on 1)

The method of claim 1, wherein the second buffer status report does not include the upper entity buffer size.

### Claim 9

A user equipment (UE) in a wireless communication system, the UE comprising:
a radio frequency (RF) module including a transceiver configured to transmit/receive signals to/from a network; and
a processor configured to process the signals,
wherein the processor is configured to:
receive, by the UE, a message including information on a number N of lower entities to report an upper entity buffer size of a radio bearer; and
transmit the buffer status report to each of M scheduling nodes,
wherein the UE is scheduled by M scheduling nodes,
wherein the radio bearer comprises one upper entity and M lower entities, and the M lower entities are comprised in the radio bearer based on the M scheduling nodes, and
wherein the buffer status report transmitted to each of the M scheduling nodes comprises a first buffer status report transmitted by N lower entities of the M lower entities and that includes the upper entity buffer size and a corresponding lower entity buffer size, and a second buffer status report that is transmitted by M−N lower entities other than the N lower entities and that includes the corresponding lower entity buffer size, and
wherein N≤M, and M is larger than two.

### Claim 10 (depends on 9)

The UE of claim 9, wherein the processor is further configured to indicate, by the upper entity, the upper entity buffer size to the N lower entities, based on uplink data being available for transmission in the upper entity.

### Claim 11 (depends on 10)

The UE of claim 10, wherein the upper entity indicates the upper entity buffer size as zero to the M−N lower entities other than the N lower entities.

### Claim 12 (depends on 9)

The UE of claim 9, wherein the message further includes identity information for the N lower entities.

### Claim 13 (depends on 9)

The UE of claim 9,
wherein the message further includes information on a first upper entity buffer size threshold value associated with N,
wherein based on the upper entity buffer size being larger than or equal to the first upper entity buffer size threshold value, the N lower entities transmit the buffer status report including the upper entity buffer size, and
wherein based on the upper entity buffer size being less than the first upper entity buffer size threshold value, the M lower entities transmit the buffer status report not including the upper entity buffer size.

### Claim 14 (depends on 13)

The UE of claim 13,
wherein the message further includes information on a number N1 of lower entities to report the upper entity buffer size and a second upper entity buffer size threshold value associated with N1,
wherein N≠N1 and the second upper entity buffer size threshold value is larger than the first upper entity buffer size threshold value, and
wherein based on the upper entity buffer size being larger than or equal to the second upper entity buffer size threshold value, the N1 lower entities transmit the buffer status report including the upper entity buffer size.

### Claim 15 (depends on 9)

The UE of claim 9, wherein:
the upper entity corresponds to a packet data convergence protocol (PDCP) entity, and
the lower entity corresponds to a Medium access control (MAC) entity.

### Claim 16 (depends on 9)

The UE of claim 9, wherein the second buffer status report does not include the upper entity buffer size.