Robust header compression handling during packet data convergence protocol re-establishment

Patent metadata

Field	Value
Publication number	US-12470641-B2
Application number	US-202117800518-A
Country	US
Kind code	B2
Filing date	Jan 29, 2021
Priority date	Apr 9, 2020
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A receiving device re-establishing a packet data convergence protocol (PDCP) entity. The receiving device resets a robust header compression (ROHC) context. The receiving device receives packet retransmissions having header compression based on the ROHC. The receiving device performs decompression of the packet retransmissions. The receiving device discards duplicate packets after performing the decompression of the packet retransmissions.

First claim

The invention claimed is:

1 . A method of wireless communication performed by a receiving device, comprising:
re-establishing a packet data convergence protocol (PDCP) entity; resetting a robust header compression (ROHC) context; receiving packet retransmissions having header compression based on the ROHC; and performing decompression of the packet retransmissions, wherein:
up to decompressing a final lost packet before the PDCP entity was re-established, the receiving device discards duplicate packets after performing the decompression of the packet retransmissions; and
after decompressing the final lost packet, the receiving device discards the duplicate packets before performing the decompression.

2 . The method of claim 1 , wherein the receiving device discards a duplicate packet after performing the decompression of the packet retransmissions if the duplicate packet duplicates a packet received before the PDCP entity was re-established.

3 . The method of claim 2 , wherein the receiving device discards the duplicate packet before performing the decompression if the duplicate packet duplicates the packet received after the PDCP entity is re-established.

4 . The method of claim 1 , wherein the receiving device discards the duplicate packets after performing the decompression of the packet retransmissions until a timer expires, and wherein after the timer expires the receiving device discards the duplicate packets before performing the decompression.

5 . The method of claim 1 , wherein the receiving device discards the duplicate packets after performing the decompression of the packet retransmissions until feedback is received from an ROHC decompressor, and wherein after the feedback from the ROHC decompressor, the receiving device discards the duplicate packets before performing the decompression.

6 . The method of claim 5 , wherein the feedback indicates that the ROHC decompressor has a valid ROHC context.

7 . An apparatus for wireless communication, comprising:
a processing system configured to:
re-establish a packet data convergence protocol (PDCP) entity;
reset a robust header compression (ROHC) context;
receive packet retransmissions having header compression based on the ROHC; and
perform decompression of the packet retransmissions, wherein:
up to decompression of a final lost packet before the PDCP entity was re-established, the processing system is configured to discard duplicate packets after performing the decompression of the packet retransmissions; and
after decompression of the final lost packet, the processing system is configured to discard the duplicate packets before performing the decompression.

8 . The apparatus of claim 7 , wherein the processing system is configured to discard a duplicate packet after the decompression of the packet retransmissions if the duplicate packet duplicates a packet received before the PDCP entity was re-established.

9 . The apparatus of claim 8 , wherein the processing system is configured to discard the duplicate packet before the decompression if the duplicate packet duplicates the packet received after the PDCP entity is re-established.

10 . The apparatus of claim 7 , wherein the processing system is configured to discard the duplicate packets after the decompression of the packet retransmissions until a timer expires, and wherein after the timer expires the processing system is configured to discard the duplicate packets before the decompression.

11 . The apparatus of claim 7 , wherein the processing system is configured to discard the duplicate packets after the decompression of the packet retransmissions until feedback is received from an ROHC decompressor, and wherein after the feedback from the ROHC decompressor, the processing system is configured to discard the duplicate packets before the decompression.

12 . The apparatus of claim 11 , wherein the feedback indicates that the ROHC decompressor has a valid ROHC context.

13 . A non-transitory computer-readable storage medium comprising code stored thereon that, when executed by an apparatus, causes the apparatus to:
re-establish a packet data convergence protocol (PDCP) entity; reset a robust header compression (ROHC) context; receive packet retransmissions having header compression based on the ROHC; and perform decompression of the packet retransmissions, wherein:
up to decompression of a final lost packet before the PDCP entity was re- established, the code causes the apparatus to discard duplicate packets after performing the decompression of the packet retransmissions; and
after decompression of the final lost packet, the code causes the apparatus to discard the duplicate packets before performing the decompression.

14 . The non-transitory computer-readable storage medium of claim 13 , wherein the code, when executed, causes the apparatus to discard a duplicate packet after the decompression of the packet retransmissions if the duplicate packet duplicates a packet received before the PDCP entity was re-established.

15 . The non-transitory computer-readable storage medium of claim 14 , wherein the code, when executed, causes the apparatus to discard the duplicate packet before the decompression if the duplicate packet duplicates the packet received after the PDCP entity is re- established.

16 . The non-transitory computer-readable storage medium of claim 13 , wherein the code, when executed, causes the apparatus to discard the duplicate packets after the decompression of the packet retransmissions until a timer expires, and wherein after the timer expires the code, when executed, causes the apparatus to discard the duplicate packets before the decompression.

17 . The non-transitory computer-readable storage medium of claim 13 , wherein the code, when executed, causes the apparatus to discard the duplicate packets after the decompression of the packet retransmissions until feedback is received from an ROHC decompressor, and wherein after the feedback from the ROHC decompressor, the code, when executed, causes the apparatus to discard the duplicate packets before the decompression.

18 . The non-transitory computer-readable storage medium of claim 17 , wherein the feedback indicates that the ROHC decompressor has a valid ROHC context.

Assignees

• Qualcomm Inc

Inventors

• Kanamarlapudi Sitaramanjaneyulu
• Balasubramanian Arun Prasanth
• Zacharias Leena
• Kadiri Prasad Reddy
• Meylan Arnaud
• Ozturk Ozcan
• Li Yuyi
• Bathwal Saket
• Paradkar Vinay
• Dalmiya Vishal
• Wu Peng
• Rao Vaishakh
• Weng Ching Ho
• Chittoor Brahmanandam Sapna

Classifications

• H04L69/22

  Parsing or analysis of headers · CPC title

• H04L69/324

  in the data link layer [OSI layer 2], e.g. HDLC · CPC title

• H04L1/1838

  for semi-reliable protocols, e.g. for less sensitive applications such as streaming video (buffer level management for video bitstream receiver H04N21/44004) · CPC title

• H04L1/189

  Transmission or retransmission of more than one copy of a message · CPC title

• H04L69/04 Primary

  Protocols for data compression, e.g. ROHC · CPC title