Compression method and device

Abstract

A method and an apparatus for data transmission are provided in the present invention, and the method includes the following steps: transmitting a second apparatus a signaling which carries an Internet Protocol (IP) head to be compressed and a head compression context identifier, wherein, the IP head to be compressed is determined according to a first IP head compression method, and the head compression context identifier is used to identify the IP head to be compressed; using the fist IP head compression method to compress the IP head, and transmitting the second apparatus a second IP data packet in which the IP head has been compressed, wherein, the second IP data packet carries the head compression context identifier, so that the second apparatus determines the IP head to be compressed which corresponds to the head compression context identifier carried in the second data packet after receiving the second data packet, and recovers the second data packet to the IP data packet which has not been compressed according to the determined IP head to be compressed, thereby improving the transfer efficiency of head compression context.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a compression method and device. Background technique [0002] The packet data convergence protocol (PacketData Convergence Protocol, PDCP) layer and its compression function in the long-term evolution (Long Term Evolution, LTE) specification, the air interface between the evolution base station (EvolutionNodeB, eNB) and the user equipment (User Equipment, UE) They are respectively used for signaling compression on the control plane and data compression on the user plane. [0003] The robust IP header compression (Robust HeaderCompression, ROHC) is performed on the packet flow in the PDCP layer of the UE and the eNB, and its functional entities include a compressor and a decompressor. This compression method can not only save the capacity of the air interface, but also save Transmission capacity on the LTE-Uu interface. ROHC includes Internet Protocol (Internet Pro...

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Problems solved by technology

[0004] The nested IP header is divided into two layers. The inner IP header can be IP / UDP / RTP, IP / UDP, IP / TCP (Transport Control Protocol) protocol header, and the outer IP header can be Internet Protocol (Internet Protocol, IP / UDP / GTP-U) / User Datagram Protocol (User Datagram Protocol, UDP) / GPRS Tunneling Protocol-User plane protocol (GPRS Tunneling Protocol-User plane, GTP-U), through the inner IP packet header compression frame or outer IP The packet header compression framework compresses the headers of each protocol separately and sends IP data packets, thereby reducing the transfer efficiency of the header compression context

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