Ciphering sequence number for an adjacent layer protocol in data packet communications

Abstract

A data packet communication system employs data encryption in a packet data convergence protocol (PDCP) and radio link control (RLC) in Layer 2 of transmission between a transmitter (TX) and a receiver (RX). A single sequence number is used for both the PDCP and RLC to reduce overhead by signaling a TX PDCP first ciphering sequence number to the RX prior to encrypted data packet communication. A sequence number accompanies each RLC PDU, which can encompass concatenated or segmented service data units (SDUs) from the higher layer PDCP. This sequence number is sufficient for the RLC to perform re-ordering, gap detection, retransmission, etc., while also allowing the RX upper layer PDCP to reconstruct a sequenced value used to encrypt content.

Description

[0001] Claiming Priority Based on 35 U.S.C. §119 [0002] [001] This patent application claims priority to U.S. Provisional Patent Application No. 60 / 915,404, filed May 1, 2007, entitled "CIPHERING SEQUENCE NUMBER IN LTE", and , U.S. Provisional Patent Application Serial No. 60 / 916,261 entitled "CIPHERING SEQUENCENUMBER IN LTE", both of which have been assigned to the assignee of the present application and are hereby expressly incorporated by reference into this patent Apply. technical field [0003] [002] The present disclosure relates to data packet communication systems, and in particular, the present disclosure relates to systems in which adjacent layers in a protocol stack require different protocols for their respective packet data units (PDUs). serial number. Background technique [0004] [003] Evolved communication systems such as 3GPP Long Term Evolution (LTE) in a flat architecture by co-locating functions (for example, two sub-layers that will be considered par...

AI Technical Summary

Problems solved by technology

In addition, RLC concatenates or segments PDUs from upper layers, adding additional complexity in obtaining PDUs at the receiver

Images