Data pack serial number counting method and data pack transmission method

Abstract

This invention relates to a method for computing serial numbers of data packets including: 1, setting a sphere(a, b) of a sliding window, starting point (a) of which is the serial number of an expected data packet and terminal point (b) of which is determined by the length of a preset sliding window, 2, a high byte of (a) and the low byte of the serial number of the received data packet currently constitute a serial number of the data packet c, 3, judging if the high byte meeting (a) is the same with that of (b) and (c) is in the window or the bytes of them are different and (c) is in one of the conditions in the (a, x) sphere, if so, the current number of the packet is (c), otherwise, step 4 is proceeded: the high byte of (b) and the low byte of the received data packet number compose a number (e), 5, if the high bytes of (a) and (b) are different and (e) is in the (y, b) sphere, then the current number is (e) and (x) is composed of the high byte of (a) and a low byte of OxFF and (y) is composed of a high byte of (y) and an OxOO low byte, which can compute the serial numbers of all data packets.

Description

technical field [0001] The present invention relates to data transmission technology in the communication field, in particular to packet data convergence layer data transmission control technology in mobile communications, especially a data packet serial number extraction method and corresponding PDCP (packet data convergence protocol, packet data protocol) in the data transmission process Convergence protocol) packet transmission method in the case of out-of-sequence at the layer. Background technique [0002] At present, the processing of TCP / IP data packets is mainly based on the RFC2507 protocol. Since the RFC2507 protocol uses incremental compression technology, the receiving end has strict requirements on the continuity of the compressed data packets when decompressing. However, since good wireless transmission conditions are usually not guaranteed in the actual communication environment, it often occurs that the data packets received by the receiving end are out of or...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a data packet sequence number calculation method and a data packet transmission method to solve the problem that the existing calculation method does not take into account the out-of-order or even packet loss of data packets in the data transmission process, resulting in carry and abdication and high-byte loopback, etc., which in turn causes the technical problem that the serial number of the full-header data packet obtained according to the existing calculation method of the serial number of the full-header data packet is wrong

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