Method for supporting variant sequence number by packet data convergence protocol

Abstract

The invention discloses a method of supporting variable-length sequence number by a packet data convergence protocol. The method comprises the following steps: a transmission side writes a type tag of the sequence number at a head of a protocol data unit of the packet data convergence protocol to be transmitted, and transmits the protocol data unit to a receiving side; the type of the sequence number is an absolute sequence number or a window-based low-bit sequence number, when the type of the sequence number is the absolute sequence number, the sent protocol data unit sequence number is all the bits of the sequence number; when the type of the sequence number is the low-bit sequence number based on a reference value window, the bit number is less than or equal to the bit number when the type of the sequence number is the absolute sequence number; and the receiving side receives the protocol data unit and combines the protocol data unit in sequence according to the type tag of the sequence number in the protocol data unit and the sequence number. The method can enhance the transmission efficiency and support a way of disorderly delivering data on a bottom layer.

Description

A Method of Packet Data Convergence Protocol Supporting Variable Length Sequence Numbers technical field The present invention relates to the field of communications, in particular to a packet data convergence protocol proposed by the 3rd Generation Partnership Project (The 3rd Generation Partnership Project, referred to as 3GPP) under the long-term evolution (LongTimeEvolution, LTE) / system architecture evolution (SystemArchitectureEvolution, SAE) of the mobile communication system The protocol data unit (ProtocolDataUnit, PDU) of (PacketDataConvergenceProtocol, PDCP) supports the method of variable length sequence number (SequenceNumber, SN). Background technique With the development of flat network architecture and the emergence of various high-speed broadband mobile access methods, the evolved wireless communication system can provide higher transmission rates, shorter transmission delays, and lower costs, while supporting 3GPP The mobility between internal access syste...

AI Technical Summary

Problems solved by technology

However, if the SN in the PDCP PDU is too long, it will occupy a large amount of bandwidth; if it is too short, it will be difficult to recover when the sequence number is out of sync on the receiving side

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