# US 12,120,185 B2 · Methods and apparatuses for providing header compression protocol reset > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,185 B2 - Document ID: US12120185B2 - Status: Granted - Kind: B2 - Application number: 18/249,683 - Filed: 2021-10-19 - Published: 2023-12-21 - Granted: 2024-10-15 - Earliest claimed: 2020-10-22 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (PUBL) - Inventors: Torsten Dudda; Zhenhua Zou - Web page: https://patentgrep.com/patent/US12120185B2 ## CPC - H04L 67/141: Setup of application sessions (admission control or resource allocation in data switching networks H04L47/70) - H04L 69/04: Protocols for data compression, e.g. ROHC - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract According to an aspect, there is provided a method performed by a wireless device for performing Packet Data Convergence Protocol, PDCP, entity re-establishment. The wireless device is acting as a Packet Data Convergence Protocol, PDCP, receiving entity. The method comprises receiving (101) a request to perform PDCP entity re-establishment; responsive to the request, resetting (103) a header compression protocol by discarding any contexts associated with the header compression protocol, and refraining (105) from transmitting feedback associated with the header compression protocol to a PDCP transmitting entity. ## Claims ### Claim 1 A method performed by a wireless device for performing Packet Data Convergence Protocol, PDCP, entity re-establishment, wherein the wireless device is acting as a Packet Data Convergence Protocol, PDCP, receiving entity, the method comprising: receiving a request to perform PDCP entity re-establishment; responsive to the request, resetting a header compression protocol by discarding any contexts associated with the header compression protocol, refraining from transmitting feedback associated with the header compression protocol to a PDCP transmitting entity; and resuming generation and transmission of feedback associated with the header compression protocol responsive to establishing a new context associated with the header compression protocol after completion of the PDCP entity re-establishment. ### Claim 2 (depends on 1) The method as in claim 1, further comprising: responsive to the request, performing header decompression according to the header compression protocol for all stored PDCP service data units, SDUs, without generating feedback associated with the header decompression. ### Claim 3 (depends on 1) The method as in claim 1, wherein the step of refraining from transmitting comprises discarding any feedback associated with the header compression protocol that was generated prior to receiving the request to perform PDCP entity re-establishment and that had not yet been transmitted to the PDCP transmitting entity. ### Claim 4 (depends on 1) The method as in claim 1, wherein the feedback comprises an indication of whether establishment of a context is successful. ### Claim 5 A method performed by a base station for performing Packet Data Convergence Protocol, PDCP, entity re-establishment, wherein the base station is acting as a PDCP receiving entity, the method comprising: receiving a request to perform PDCP entity re-establishment; responsive to the request, resetting a header compression protocol by discarding any contexts associated with the header compression protocol, refraining from transmitting feedback associated with the header compression protocol to a PDCP transmitting entity; and resuming generation and transmission of feedback associated with the header compression protocol responsive to establishing a new context associated with the header compression protocol after completion of the PDCP entity re-establishment. ### Claim 6 (depends on 5) The method of claim 5, further comprising responsive to the request, performing header decompression according to the header compression protocol for all stored PDCP service data units, SDUs, without generating feedback associated with the header decompression. ### Claim 7 (depends on 5) The method as in claim 5, wherein the step of refraining from transmitting comprises discarding any feedback associated with the header compression protocol that was generated prior to receiving the request to perform PDCP entity re-establishment and that had not yet been transmitted to the PDCP transmitting entity. ### Claim 8 (depends on 5) The method as in claim 5, wherein the feedback comprises an indication of whether establishment of a context is successful. ### Claim 9 A wireless device for performing Packet Data Convergence Protocol, PDCP, entity re-establishment, wherein the wireless device is acting as a Packet Data Convergence Protocol, PDCP, receiving entity, the wireless device configured to: receive a request to perform PDCP entity re-establishment; responsive to the request, reset a header compression protocol by discarding any contexts associated with the header compression protocol, and refrain from transmitting feedback associated with the header compression protocol to a PDCP transmitting entity; and resume generation and transmission of feedback associated with the header compression protocol responsive to establishing a new context associated with the header compression protocol after completion of the PDCP entity re-establishment. ### Claim 10 (depends on 9) The wireless device as in claim 9, further configured to: responsive to the request, perform header decompression according to the header compression protocol for all stored PDCP service data units, SDUs, without generating feedback associated with the header decompression. ### Claim 11 (depends on 9) The wireless device as in claim 9, wherein the wireless device is configured to refrain from transmitting by discarding any feedback associated with the header compression protocol that was generated prior to receiving the request to perform PDCP entity re-establishment and that had not yet been transmitted to the PDCP transmitting entity. ### Claim 12 (depends on 9) The wireless device as in claim 9, wherein the feedback comprises an indication of whether establishment of a context is successful. ### Claim 13 A base station for performing Packet Data Convergence Protocol, PDCP, entity re-establishment, wherein the base station is acting as a PDCP receiving entity, the base station configured to: receive a request to perform PDCP entity re-establishment; responsive to the request, reset a header compression protocol by discarding any contexts associated with the header compression protocol, refrain from transmitting feedback associated with the header compression protocol to a PDCP transmitting entity; and resume transmission of feedback associated with the header compression protocol responsive to establishing a new context associated with the header compression protocol after completion of the PDCP entity re-establishment. ### Claim 14 (depends on 13) The base station of claim 13, further configured to, responsive to the request, perform header decompression according to the header compression protocol for all stored PDCP service data units, SDUs, without generating feedback associated with the header decompression. ### Claim 15 (depends on 13) The base station as in claim 13, wherein the base station is configured to refrain from transmitting by discarding any feedback associated with the header compression protocol that was generated prior to receiving the request to perform PDCP entity re-establishment and that had not yet been transmitted to the PDCP transmitting entity. ### Claim 16 (depends on 13) The base station as in claim 13, wherein the feedback comprises an indication of whether establishment of a context is successful.