Adaptive error detection method used for cellular mobile communication system

Abstract

The invention discloses an adaptive error detection method used for a cellular mobile communication system. The method comprises the following steps of: respectively performing time interval (TI) sampling used for calculating the time interval of received two adjacent protocol data units (PDUs) and TI smoothing used for realizing filtering in a radio link control protocol layer entity; performinground trip time (RTT) sampling used for acquiring a round-trip delay of each protocol data unit (PDU), RTT smoothing used for realizing the filtering, k sampling used for acquiring the repeat number of each error protocol data unit, and k smoothing used for realizing the filtering in a medium access control (MAC) layer; and setting a time-out value of a reordering timer. The method detects the lost packets of the MAC layer accurately and timely, avoids unnecessary repeat of radio link control (RLC), and reduces the repeat delay of the packets by adaptively estimating the repeat time of MAC PDU and optimizing a t-reordering value of a selective repeat-automatic repeat request (SR-ARQ). By using the method, low complexity is realized without increasing the overhead of an air interface of a radio link.

Description

technical field [0001] The invention belongs to the field of mobile communication, in particular to an error detection method used in a cellular mobile communication system. Background technique [0002] The evolution idea of ​​the new-generation mobile communication system is mainly to continuously enhance the data transmission capability of the air interface by adopting high-order modulation methods and various effective channel coding technologies, and finally make the wireless interface and core network all move towards IP (Internet Protocol). [0003] Since the wireless interface part of the mobile communication network adopts wireless transmission mode, compared with the wired network, wireless communication has the characteristics of high bit error rate, which will increase the loss rate of data packets and cause sudden packet loss. A high packet loss rate will degrade the performance of high-level protocols, thereby affecting the quality of data services, especially ...

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Problems solved by technology

Therefore, too small a timer value will lead to unnecessary retransmissions, which will not only cause repeated packets at the receiver, but also waste channel resources and increase the energy consumption of the sender

[0009] 2) The value of the t-Reordering timer is too large

If the value of the t-Reordering timer is set too large, it will cause the RLC receiver to delay sending STATUS, so that the RLC sender cannot retransmit the lost packet in time, which will increase the delay of the packet on the air interface and the retransmission of the packet. Reassemble delay, and increasing the delay will affect the performance of the upper layer transmission protocol and the implementation of the business

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