# US 11,122,640 B2 · Method and apparatus for handling soft buffer size with dual connectivity in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,640 B2 - Document ID: US11122640B2 - Status: Granted - Kind: B2 - Application number: 16/631,130 - Filed: 2018-07-30 - Published: 2020-07-23 - Granted: 2021-09-14 - Earliest claimed: 2017-07-28 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Yunjung Yi; Youngtae Kim; Duckhyun Bae - Web page: https://patentgrep.com/patent/US11122640B2 ## CPC - H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer - H04L 1/1835: {Buffer management} - H04L 5/0082: {at predetermined intervals} - H04L 5/0092: {Indication of how the channel is divided} - H04W 8/22: Processing or transfer of terminal data, e.g. status or physical capabilities - H04W 8/24: Transfer of terminal data - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method and apparatus for handling a soft buffer size in a wireless communication system is provided. It is assumed that a user equipment (UE) is connected to both a long-term evolution (LTE) system and a new radio access technology (NR) system in dual connectivity. The UE determines a first UE capability for the LTE system and a second UE capability for the NR system, determines a total soft buffer size based on the first UE capability and the second UE capability, and shares the total soft buffer size between the LTE system and the NR system based on at least one of a maximum transport block size (TBS) per transmission time interval (TTI) and a number of carriers used in the NR system. ## Claims ### Claim 1 A method for handling a soft buffer size by a user equipment (UE) in a wireless communication system, wherein the UE is connected to both a first system and a second system in dual connectivity, the method comprising: determining a first UE capability for the first system and a second UE capability for the second system; determining a total soft buffer size based on the first UE capability and the second UE capability; and sharing the total soft buffer size between the first system and the second system based on at least one of a maximum transport block size (TBS) per transmission time interval (TTI) and a number of carriers used in the second system, wherein the maximum TBS per TTI is defined per bandwidth part (BWP). ### Claim 2 (depends on 1) The method of claim 1, wherein the sharing the total soft buffer size between the first system and the second system comprises: determining a required soft buffer size for the second system based on at least one of the maximum TBS per TTI and the number of carriers used in the second system; and assigning a soft buffer size which is remained after subtracting the required soft buffer size for the second system from the total soft buffer size to the first system. ### Claim 3 (depends on 2) The method of claim 2, wherein the required soft buffer size for the second system is reported to a network. ### Claim 4 (depends on 1) The method of claim 1, wherein the maximum TBS per TTI is a function of a minimum bandwidth of a BWP. ### Claim 5 (depends on 1) The method of claim 1, wherein the first UE capability for the first system is defined based on a UE category in the first system or a peak data rate in the first system. ### Claim 6 (depends on 1) The method of claim 1, wherein the second UE capability for the second system is defined based on a peak data rate in the second system. ### Claim 7 (depends on 1) The method of claim 1, wherein the first system is a long-term evolution (LTE) system, and wherein the second system is a new radio access technology (NR) system. ### Claim 8 (depends on 1) The method of claim 1, wherein the UE is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the UE. ### Claim 9 A user equipment (UE) configured to operate in a wireless communication system, wherein the UE is configured to be connected to both a first system and a second system in dual connectivity, the UE comprising: a memory; a transceiver; and a processor, operably coupled to the memory and the transceiver, that is configured to perform operations comprising: determining a first UE capability for the first system and a second UE capability for the second system; determining a total soft buffer size based on the first UE capability and the second UE capability; and sharing the total soft buffer size between the first system and the second system based on at least one of a maximum transport block size (TBS) per transmission time interval (TTI) and a number of carriers used in the second system, wherein the maximum TBS per TTI is defined per bandwidth part (BWP). ### Claim 10 (depends on 9) The UE of claim 9, wherein the sharing the total soft buffer size between the first system and the second system comprises: determining a required soft buffer size for the second system based on at least one of the maximum TBS per TTI and the number of carriers used in the second system; and assigning a soft buffer size which is remained after subtracting the required soft buffer size for the second system from the total soft buffer size to the first system. ### Claim 11 (depends on 10) The UE of claim 10, wherein the required soft buffer size for the second system is reported to a network. ### Claim 12 (depends on 9) The UE of claim 9, wherein the maximum TBS per TTI is a function of a minimum bandwidth of a BWP. ### Claim 13 (depends on 9) The UE of claim 9, wherein the first UE capability for the first system is defined based on a UE category in the first system or a peak data rate in the first system. ### Claim 14 (depends on 9) The UE of claim 9, wherein the second UE capability for the second system is defined based on a peak data rate in the second system.