US-20260129509-A1 - METHOD AND APPARATUS FOR BUFFER STATUS REPORT IN NEXT GENERATION MOBILE COMMUNICATION SYSTEM

US20260129509A1US 20260129509 A1US20260129509 A1US 20260129509A1US-20260129509-A1

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. In addition, the present disclosure relates to a method and apparatus for a BSR of a user equipment in a wireless communication system. The present disclosure relates to a method for a user equipment in a wireless communication system and an apparatus performing same, the method comprising the steps of: receiving, from a base station, control information for reporting delta buffer size information; acquiring the delta buffer size information on the basis of the control information; and transmitting, to the base station, a medium access control control element (MAC CE) including the delta buffer size information, wherein the delta buffer size information is determined on the basis of the buffer size of a logical channel group (LCG) and the reference buffer size.

Inventors

Weiping Sun
Anil Agiwal
Hyunjeong KANG
Sangkyu BAEK

Assignees

SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20230912
Priority Date: 20220926

Claims (16)

1 . A method for a terminal in a wireless communication system, the method comprising: receiving, from a base station, control information for reporting a buffer status report (BSR); acquiring first buffer size information and second buffer size information for a logical channel group (LCG) based on the control information; and transmitting, to the base station, a medium access control control element (MAC CE) including the first buffer size information and the second buffer size information for the LCG, wherein the second buffer size information is determined based on a buffer size of the LCG and a buffer size of the first buffer size information.
2 . The method of claim 1 , wherein the delta buffer size information corresponds to a delta buffer size determined based on a difference between the buffer size of the first buffer size information and the buffer size of the LCG, and wherein the MAC CE further includes an identity of the LCG.
3 . The method of claim 1 , further comprising: transmitting, to the base station, capability information of the terminal, the capability information including a parameter indicating that a usage of the second buffer size information is supported by the terminal.
4 . The method of claim 1 , wherein the control information further includes a list of LCGs for the second buffer size information and a threshold, and wherein the second buffer size information is acquired for the MAC CE, in case that the buffer size of the LCG is larger than the threshold.
5 . A method for a base station in a wireless communication system, the method comprising: transmitting, to a terminal, control information for reporting a buffer status report (BSR); receiving, from the terminal, a medium access control control element (MAC CE) including first buffer size information and second buffer size information for a logical channel group (LCG) based on the control information; and determining a buffer size of the LCG based on the first buffer size information and the second buffer size information, wherein the second buffer size information is determined based on a buffer size of a the LCG and a buffer size of the first buffer size information.
6 . The method of claim 5 , wherein the delta buffer size information corresponds to a delta buffer size determined based on a difference between the buffer size of the first buffer size information and the buffer size of the LCG, and wherein the MAC CE further includes an identity of the LCG.
7 . The method of claim 5 , further comprising: receiving, from the terminal, capability information of the terminal, the capability information including a parameter indicating that a usage of the second buffer size information is supported by the terminal.
8 . The method of claim 5 , wherein the control information further includes a list of LCGs for the second buffer size information and a threshold, and wherein the second buffer size information is acquired for the MAC CE, in case that the buffer size of the LCG is larger than the threshold.
9 . A terminal in a wireless communication system, the terminal comprising: a transceiver; and at least one processor coupled to the transceiver and configured to: receive, from a base station, control information for reporting a buffer status report (BSR); acquire first buffer size information and second buffer size information for a logical channel group (LCG) based on the control information; and transmit, to the base station, a medium access control control element (MAC CE) including the first buffer size information and the second buffer size information for the LCG, wherein the second buffer size information is determined based on a buffer size of a the LCG and a buffer size of the first buffer size information.
10 . The terminal of claim 9 , wherein the delta buffer size information corresponds to a delta buffer size determined based on a difference between the buffer size of the first buffer size information and the buffer size of the LCG, and wherein the MAC CE further includes an identity of the LCG.
11 . The terminal of claim 9 , wherein the at least one processor is configured to transmit, to the base station, capability information of the terminal, the capability information including a parameter indicating that a usage of the second buffer size information is supported by the terminal.
12 . The terminal of claim 9 , wherein the MAC CE control information further includes a list of LCGs for the second buffer size information and a threshold, and wherein the second buffer size information is acquired for the MAC CE, in case that the buffer size of the LCG is larger than the threshold.
13 . A base station in a wireless communication system, the base station comprising: a transceiver; and at least one processor coupled to the transceiver and configured to: transmit, to a terminal, control information for reporting a buffer status report (BSR); receive, from the terminal, a medium access control control element (MAC CE) including first buffer size information and second buffer size information for a logical channel group (LCG) based on the control information; and determine a buffer size of the LCG based on the first buffer size information and the second buffer size information, wherein the second buffer size information is determined based on a buffer size of the LCG and a buffer size of the first buffer size information.
14 . The base station of claim 13 , wherein the delta buffer size information corresponds to a delta buffer size determined based on a difference between the buffer size of the first buffer size information and the buffer size of the LCG, and wherein the MAC CE further includes an identity of the LCG.
15 . The base station of claim 13 , wherein the at least one processor is configured to receive, from the terminal, capability information of the terminal, the capability information including a parameter indicating that a usage of the second buffer size information is supported by the terminal.
16 . The base station of claim 13 , wherein the control information further includes a list of LCGs for the second buffer size information and a threshold, and wherein the second buffer size information is acquired for the MAC CE, in case that the buffer size of the LCG is larger than the threshold.

Description

TECHNICAL FIELD The present disclosure relates to the field of communications, and to operations of a terminal and a base station. In particular, the present disclosure relates to a method for reporting a buffer status report (BSR) of a terminal, a method for obtaining a BSR in a base station, and a terminal, base station, and communication system related thereto. BACKGROUND ART 5G mobile communication technologies define broad frequency bands to provide higher transmission rates and new services, and can be implemented in “Sub 6 GHz” bands such as 3.5 GHz, and also in “above 6 GHz” bands, which may be referred to as mm Wave bands including 28 GHz and 39 GHz. In addition, the implementation of 6G mobile communication technologies, which may be called a Beyond 5G system, in terahertz bands (e.g., 95 GHz to 3 THz bands) has been considered in order to achieve transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies reduced to one-tenth of 5G mobile communication technologies. In the beginning of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there had been ongoing standardization regarding Beamforming and massive multi-input multi-output (MIMO) for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting various numerologies (e.g., operating a plurality of subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of a Bandwidth Part (BWP), new channel coding methods such as a Low Density Parity Check (LDPC) code for large amount of data transmission and a polar code for highly reliable transmission of control information, layer 2 (L2) pre-processing, and Network Slicing for providing a dedicated network specialized to a specific service. Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as Vehicle-To-Everything (V2X) for aiding driving determination by autonomous vehicles based on information regarding locations and states of vehicles transmitted by the vehicles and for enhancing user convenience, New Radio-Unlicensed (NR-U) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE power saving, Non-Terrestrial Network (NTN), which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning, etc. Moreover, there has been ongoing standardization in air interface architecture/protocol regarding technologies such as Industrial Internet Of Things (IIoT) for supporting new services through interworking and convergence with other industries, Integrated Access And Backhaul (IAB) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and Dual Active Protocol Stack (DAPS) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR), etc., and there also has been ongoing standardization in system architecture/service regarding a 5G baseline architecture (e.g., Service based Architecture or Service based Interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE locations, etc. As such 5G mobile communication systems are commercialized, an exponentially increasing number of connected devices will be connected to communication networks, and it is expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with extended Reality (XR) for efficiently supporting Augmented Reality (AR), Virtual Reality (VR), Mixed Reality (MR), etc., 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, drone communication, and the like. In addition, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamate