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GPRS optimized encoding method based on network monitoring

A coding method and network monitoring technology, applied in the direction of using the return channel for error prevention/detection, digital transmission systems, electrical components, etc., can solve the problems of sensitivity to noise interference, weak anti-interference ability, and increased number of retransmissions, etc., to ensure Transmission quality, guarantee full utilization effect

Inactive Publication Date: 2009-07-08
BEIJING JIAOTONG UNIV
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Problems solved by technology

In other words, the C2 encoding method is more sensitive to noise interference than the C1 method
From the perspective of RLC, because the C2 coding method has weak anti-interference ability and is prone to errors, the ARQ method is used on RLC. When the data is wrong, the data is required to be retransmitted. Therefore, when the wireless environment is relatively poor, the number of retransmissions will increase, affecting the QoS of data transmission

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  • GPRS optimized encoding method based on network monitoring
  • GPRS optimized encoding method based on network monitoring
  • GPRS optimized encoding method based on network monitoring

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Embodiment Construction

[0017] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0018] The adaptive encoding and decoding scheme proposed by the present invention is that the sending end decides whether to perform variable encoding according to the response message from the receiving end. A threshold of bit error rate is set, and when the bit error rate of C2 encoding is greater than the threshold, the C1 encoding mode is adopted, and when the bit error rate of C1 encoding is smaller than the threshold, the C2 encoding mode is adopted.

[0019] In view of the situation that one party may not receive the request or response of the other party to change the encoding that may occur in the process of automatic encoding, the present invention adopts two measures to ensure the reliable reception of the control frame:

[0020] 1) Set up a timer. If no response is received from the other party within the specified return time, it will be considered ...

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Abstract

The invention discloses an optimal coding method of general packet radio service (GPRS) based on networking monitoring. The method comprises the following steps: a transmitting terminal decides whether to perform the variable coding according to the response message from a receiving terminal by means of networking monitoring; a threshold of bit error rate is set; when the bit error rate of C2 coding is larger than the threshold, C1 coding is adopted; and when the bit error rate of C1 coding is less than the threshold, C2 coding is adopted. The implementation of adaptive coding enables the synchronization of both sides of communication based on the handshake mechanism. In the design, the optimal coding method further ensures and controls the reliability of frame reception by use of the following two measures: in one measure, setting a timer, if not receiving the feedback of the opposing side within the specified feedback period, determining that the rate change is in failure and re-transmitting at the original rate; in the other measure, transmitting the acknowledgement signal repeatedly for three times during the handshake process, and completing the coding although the transmitting side receives the signal only once, thereby improving the reliability of variable coding. The coding method is easy to implement and has high feasibility.

Description

technical field [0001] The invention relates to a GPRS (General Packet Radio Service: General Packet Radio Service) optimized encoding method based on network monitoring, which belongs to the field of mobile communication. Background technique [0002] In the GSM-R (Railway Integrated Digital Mobile Communications System: Global System for Mobilecommunications for Railway) system, the GPRS air interface (Um interface) consists of the physical layer, RLC / MAC (Radio Link Control / Media Access Control: Radio Link Control / Media AccessControl), LLC (Logical Link Control: Logic Link Control), SNDCP (SubNetwork Dependent Convergence Protocol: SubNetwork Dependent Convergence Protocol), GMM / SM (General Packet Radio Service Mobility Management / Session Management: General Packet Radio Service MobilityManagement / Session Management), in which only the physical layer and RLC / MAC pass through the BSS (Base Station Subsystem: Base Station System), and other layers are transparently transm...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/18H04L1/16
Inventor 朱刚钟章队杨智辉庞萌萌艾渤丁建文吴昊熊磊陈霞
Owner BEIJING JIAOTONG UNIV
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