# US 10,455,446 B2 · Method for triggering a sidelink buffer status reporting in a D2D communication system and device therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,446 B2 - Document ID: US10455446B2 - Status: Granted - Kind: B2 - Application number: 15/332,962 - Filed: 2016-10-24 - Published: 2017-04-27 - Granted: 2019-10-22 - Earliest claimed: 2015-10-27 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sunyoung Lee; Seungjune Yi - Web page: https://patentgrep.com/patent/US10455446B2 ## CPC - H04W 28/0278: {using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12)} - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 28/0257: {the individual bearer or channel having a maximum bit rate or a bit rate guarantee} - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/56: based on priority criteria - H04W 92/18: between terminal devices - H04B 7/2637: {for logical channel control} - H04L 67/51: Discovery or management thereof, e.g. service location protocol [SLP] or web services - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 28/0215: {based on user or device properties, e.g. MTC-capable devices (services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51)} - H04W 28/0875: {to or through Device to Device [D2D] links, e.g. direct-mode links} - H04W 72/569: {of the traffic information} - H04W 88/02: Terminal devices - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for triggering a sidelink buffer status reporting in a D2D communication system, the method comprising: configuring a first ProSe destination including at least one first UE and a second ProSe destination including at least one second UE; receiving a first sidelink data for a first sidelink logical channel from an upper layer; receiving a second sidelink data for a second sidelink logical channel from the upper layer while the UE has the first sidelink data for the first logical channel, wherein the second logical channel has a higher priority than a priority of the first sidelink logical channel; and triggering a buffer status reporting the if the first sidelink logical channel and the second sidelink logical channel belong to a same ProSe destination. ## Claims ### Claim 1 A method for a first User Equipment (UE) operating in a wireless communication system, the method comprising: configuring one or more Proximity based Services (ProSe) destinations for SideLink (SL) communication, wherein each ProSe destination is related to one or more Logical Channel Groups (LCGs), and each LCG includes one or more SL Logical Channels (LCHs); receiving first SL data at an upper layer of a Medium Access Control (MAC) entity; and in case that the first SL data is related with a ProSe Destination that already has second SL data available for transmission, triggering a SL buffer status reporting process by the MAC entity when the first SL data belongs to a SL LCH which has a higher priority than any SL LCH of any LCG related to the second SL data within the ProSe Destination. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: in case that the first SL data is related with a ProSe Destination that has no second SL data available for transmission, triggering the SL buffer status reporting process by the MAC entity. ### Claim 3 (depends on 1) The method according to claim 1, wherein the priority of the SL LCH is ProSe Per-Packet Priority. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: transmitting the second SL data via the SL LCH upon receiving a corresponding SL grant. ### Claim 5 (depends on 1) The method of claim 1, wherein the MAC entity has a configured SL Radio Network Temporary Identifier (SL-RNTI). ### Claim 6 (depends on 1) The method of claim 1, wherein each SL LCH is related to UE-to-UE direct communication. ### Claim 7 (depends on 6) The method of claim 6, further comprising: transmitting a SL buffer status report to a base station, as a result of the triggered SL buffer status reporting process. ### Claim 8 A User Equipment (UE) operating in a wireless communication system, the first UE comprising: a Radio Frequency (RF) module including a transceiver configured to transmit and receive information; and a processor operably coupled with the RF module and configured to: configure one or more Proximity based Services (ProSe) destinations for SideLink (SL) communication, wherein each ProSe destination is related to one or more Logical Channel Groups (LCGs), and each LCG includes one or more sidelink (SL) Logical Channels (LCHs); control the RF module to receive first SL data at an upper layer of a Medium Access Control (MAC) entity; and in case that the first SL data is related with a ProSe Destination that already has second SL data available for transmission, trigger a SL buffer status reporting process by the MAC entity when the first SL data belongs to a SL LCH which has a higher priority than any SL LCH of any LCG related to the second SL data within the ProSe Destination. ### Claim 9 (depends on 8) The UE according to claim 8, wherein the processor is further configured in case that the first SL data is related with a ProSe Destination that has no second SL data available for transmission, to trigger the SL buffer status reporting process by the MAC entity. ### Claim 10 (depends on 8) The UE according to claim 8, wherein the priority of the SL LCH is ProSe Per-Packet Priority. ### Claim 11 (depends on 8) The UE according to claim 8, wherein the processor is further configured to control the RF module to transmit the second SL data via the SL LCH upon receiving a corresponding SL grant. ### Claim 12 (depends on 8) The UE according to claim 8, wherein the MAC entity has a configured SL Radio Network Temporary Identifier (SL-RNTI). ### Claim 13 (depends on 8) The UE according to claim 8, wherein each SL LCH is related to UE-to-UE direct communication. ### Claim 14 (depends on 13) The UE according to claim 13, wherein the processor is further configured to control the RF module to transmit a SL buffer status report to a base station, as a result of the triggered SL buffer status reporting process.