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THE ENHANCEMENT OF GQ-MAC PROTOCOL ON GSM/GPRS NETWORK

 

TITLE THE ENHANCEMENT OF GQ-MAC PROTOCOL ON GSM/GPRS NETWORK
AUTHOR PIMOOK NGAMTHAMMACHAT
DEGREE MASTER OF SCIENCE PROGRAMME IN COMPUTER SCIENCE
FACULTY FACULTY OF SCIENCE
ADVISOR SUDSANGUAN NGAMSURIYAROJ
CO-ADVISOR PANOMPORN SUVANNAPATTANA
 
ABSTRACT
The GSM network is the most popular network and many researchers are interested to develop applications on it. GPRS is one of the technologies used to transmit data packets over the GSM network that allow mobile communication with the Internet. One important problem is how to guarantee the QoS of data transmission in the GPRS/GSM network. Several techniques have been proposed to control QoS in the GSM network. One technique called the GQ-MAC protocol is able to guarantee the QoS of four types of traffic: streaming, conversation, interactive and background. Another technique is called Link Adaptation which helps improve the performance of packet transmission in the GPRS network by adjusting the coding scheme in changing environment. There are four coding schemes: CS1, CS2, CS3, and CS4. Each coding scheme can transfer traffic at different data rate from lowest to highest. The Link Adaptive technique uses BLER (Block Error Rate) calculation to adjust the coding scheme used. This research demonstrates an improvement to the performance of the GQMAC protocol using the Link Adaptation technique. The proposed model increases the performance of packet transmission for all traffic. Via CSIM simulation tool, four experiments were conducted. The results show better performance of each traffic transmission. Streaming traffic has higher data bit rate. Conversation traffic has a greater number of users, and interactive traffic can guarantee the throughput.
KEYWORD GSM, GPRS / GQ-MAC PROTOCOL / QUALITY OF SERVICES / LINK ADAPTIVE

 

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