# US 10,374,916 B2 · Method for transmitting a buffer status report in a communication system and device therefor

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- Number: US 10,374,916 B2
- Document ID: US10374916B2
- Status: Granted
- Kind: B2
- Application number: 15/669,278
- Filed: 2017-08-04
- Published: 2018-02-08
- Granted: 2019-08-06
- Earliest claimed: 2016-08-04
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seungjune Yi; Sunyoung Lee
- Web page: https://patentgrep.com/patent/US10374916B2

## CPC

- H04L 43/065: related to network devices
- H04W 28/0278: {using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12)}
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 43/16: Threshold monitoring
- H04W 88/02: Terminal devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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 (BSR) in a wireless communication system, the method comprising: triggering, by a medium access control (MAC) entity, a buffer status report (BSR); and transmitting the buffer status report, wherein the buffer status report includes a packet data convergence protocol (PDCP) buffer size for a radio bearer only if PDCP BSR condition is met.

## Claims

### Claim 1

A method for transmitting, by a user equipment (UE), a buffer status report (BSR) in a wireless communication system, the method comprising:
triggering, by a medium access control (MAC) entity, a first BSR and a second BSR; and
generating a signal for the first BSR;
when a second BSR condition is met:
generating a signal for the second BSR by setting a packet data convergence protocol (PDCP) buffer size; and
transmitting both of the signal for the first BSR and the signal for the second BSR; and
when the second BSR condition is not met, skipping generation of the signal for the second BSR and transmitting only the signal for the first BSR.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first BSR includes a first value for the PDCP buffer size if the second BSR condition is met and a second value for a radio link control (RLC) buffer size.

### Claim 3 (depends on 1)

The method of claim 1, wherein the MAC entity is a MAC entity configured to transmit the PDCP buffer size.

### Claim 4 (depends on 1)

The method of claim 1, wherein the second PDCP BSR condition is at least one of:
when the PDCP buffer size is equal to or larger than a threshold,
when a certain number of signals for the first BSR is generated by the MAC entity, or
when a certain time has passed since a last signal for the first BSR is generated by the MAC entity.

### Claim 5 (depends on 1)

The method of claim 1, wherein the radio bearer comprises one PDCP entity and multiple RLC entities.

### Claim 6

A user equipment (UE) in a wireless communication system, the UE comprising:
a transmitter configured to transmit signals to a network;
a receiver configured to receive the signals from the network; and
a processor configured to process the signals,
wherein the processor is configured to:
trigger, by a medium access control (MAC) entity, a first buffer status report (BSR) and a second BSR;
generate a signal for the first BSR;
when a second BSR condition is met:
generate a signal for the second BSR by setting a packet data convergence protocol (PDCP) buffer size; and
transmit both of the signal for the first BSR and the signal for the second BSR; and
when the second BSR condition is not met, skip generation of the signal for the second BSR and transmit only the signal for the first BSR.

### Claim 7 (depends on 6)

The UE of claim 6, wherein the first BSR includes a first value for the PDCP buffer size if the second BSR condition is met and a second value for a radio link control (RLC) buffer size.

### Claim 8 (depends on 6)

The UE of claim 6, wherein the MAC entity is a MAC entity configured to transmit the PDCP buffer size.

### Claim 9 (depends on 6)

The UE of claim 6, wherein the second BSR condition is at least one of:
when the PDCP buffer size is equal to or larger than a threshold,
when a certain number of signals for the first BSR is generated by the MAC entity, or
when a certain time has passed since a last signal for the first BSR is generated by the MAC entity.

### Claim 10 (depends on 6)

The UE of claim 6, wherein the radio bearer comprises one PDCP entity and multiple RLC entities.