# US 2021/0345383 A1 · Method and device for buffer status reporting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345383 A1 - Document ID: US20210345383A1 - Status: Published application - Kind: A1 - Application number: 17/266,789 - Filed: 2019-08-08 - Published: 2021-11-04 - Earliest claimed: 2018-08-08 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Milos TESANOVIC; Soenghun KIM; Jaehyuk JANG - Web page: https://patentgrep.com/patent/US20210345383A1 ## CPC - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 28/0278: {using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12)} - H04W 76/10: Connection setup - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments herein provide a method for buffer status reporting. The method includes triggering a buffer status report (BSR) in a media access control (MAC) layer, based on a BSR triggering condition; transmitting, to a base station, a scheduling request (SR) for transmitting uplink data; receiving an uplink resource allocation grant (UL grant) from the base station, based on the SR; assembling a media access control protocol data unit (MAC PDU); transmitting the MAC PDU; and determining whether to cancel the triggered BSR, based on a BSR MAC control element (BSR MAC CE) included in the MAC PDU. ## Claims ### Claim 1 A method of reporting a buffer status of a terminal, the method comprising: triggering a buffer status report (BSR) in a media access control (MAC) layer, based on a BSR triggering condition; transmitting, to a base station, a scheduling request (SR) for transmitting uplink data; receiving an uplink resource allocation grant (UL grant) from the base station, based on the SR; assembling a media access control protocol data unit (MAC PDU); transmitting the MAC PDU; and determining whether to cancel the triggered BSR, based on a BSR MAC control element (BSR MAC CE) included in the MAC PDU. ### Claim 2 (depends on 1) The method of claim 1, wherein the determining of whether to cancel the triggered BSR comprises canceling the triggered BSR, based on whether the BSR MAC CE contains buffer status information up to a certain event that triggers a BSR prior to the assembly of the MAC PDU. ### Claim 3 (depends on 1) The method of claim 1, further comprising canceling the triggered BSR when the uplink resource allocation grant is able to accommodate all pending data available for uplink transmission and is not sufficient to accommodate the BSR MAC CE and a MAC sub-header. ### Claim 4 (depends on 1) The method of claim 1, further comprising: triggering the SR, based on a certain SR triggering condition; determining whether the triggered SR has been triggered prior to the assembly of the MAC PDU; and determining whether to cancel the triggered SR, based on a result of the determination whether the triggered SR has been triggered prior to the assembly of the MAC PDU. ### Claim 5 (depends on 4) The method of claim 4, wherein the determining of whether to cancel the triggered SR comprises canceling the triggered SR, based on whether the BSR MAC CE contains buffer status information up to a certain event that triggers a BSR prior to the assembly of the MAC PDU. ### Claim 6 (depends on 4) The method of claim 4, further comprising canceling the triggered SR when the uplink resource allocation grant is able to accommodate all pending data available for uplink transmission. ### Claim 7 (depends on 4) The method of claim 4, further comprising stopping an sr-ProhibitTimer, when it is determined that the triggered SR is cancelled. ### Claim 8 (depends on 1) The method of claim 1, wherein the determining of whether to cancel the triggered BSR is performed when the MAC PDU is transmitted to the base station. ### Claim 9 (depends on 4) The method of claim 4, wherein the determining of whether to cancel the triggered SR is performed when the MAC PDU is transmitted to the base station. ### Claim 10 (depends on 1) The method of claim 1, wherein the triggering of the BSR is performed after the MAC PDU is assembled and before the MAC PDU is transmitted. ### Claim 11 An UE for reporting a buffer status, the terminal comprising: a transceiver; and one or more processors coupled with the transceiver, wherein the processor is configured to: trigger a buffer status report (BSR) in a media access control (MAC) layer, based on a BSR triggering condition; transmit, to a base station, a scheduling request (SR) for transmitting uplink data; receive an uplink resource allocation grant (UL grant) from the base station, based on the SR; assemble a media access control protocol data unit (MAC PDU); transmit the MAC PDU; and determine whether to cancel the triggered BSR, based on a BSR MAC control element (BSR MAC CE) included in the MAC PDU. ### Claim 12 (depends on 11) The UE of claim 11, wherein the processor is further configured to cancel the triggered BSR, based on whether the BSR MAC CE contains buffer status information up to a certain event that triggers a BSR prior to the assembly of the MAC PDU. ### Claim 13 (depends on 11) The UE of claim 11, wherein the processor is further configured to cancel the triggered BSR when the uplink resource allocation grant is able to accommodate all pending data available for uplink transmission and is not sufficient to accommodate the BSR MAC CE and a MAC sub-header. ### Claim 14 (depends on 11) The UE of claim 11, wherein the processor is further configured to: trigger the SR, based on a certain SR triggering condition; determine whether the triggered SR has been triggered prior to the assembly of the MAC PDU; and determine whether to cancel the triggered SR, based on a result of the determination whether the triggered SR has been triggered prior to the assembly of the MAC PDU. ### Claim 15 (depends on 10) The UE of claim 10, wherein the processor is further configured to cancel the triggered SR, based on whether the BSR MAC CE contains buffer status information up to a certain event that triggers a BSR prior to the assembly of the MAC PDU.