A study on SIP Transaction over Wireless Networks
Date Issued
2006
Date
2006
Author(s)
Hsieh, Wang-Jui
DOI
en-US
Abstract
Session Initiation Protocol (SIP) is an application-layer signaling protocol for creating, modifying and terminating multimedia sessions or calls such as voice over IP (VoIP). In SIP, an application-level timeout and retransmission mechanism called SIP Transaction are defined to recover loss/error when unreliable transport is used. Due to the lack of flexibility of the retransmission mechanism, the original design of SIP Transaction results in long call setup delay and additional message transmission overheads for wireless VoIP systems. In this thesis, we develope a two-stage adaptive retransmission mechanism (ARM) to improve the efficiency of SIP Transaction based on the proposed network architecture. An NS2-based simulation model for our ARM is presented. A series of experiments are conducted to investigate the performance of our ARM in terms of average call setup delay, number of retransmissions and power consumption.
Subjects
無線網路
信令交換
重傳機制
Wireless
SIP
SIP Transaction
Adaptive Retransmission Mechanism
Type
thesis