2 October 2006 Decentralized session initiation protocol solution in ad hoc networks
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Proceedings Volume 6387, Next-Generation Communication and Sensor Networks 2006; 63870D (2006) https://doi.org/10.1117/12.684253
Event: Optics East 2006, 2006, Boston, Massachusetts, United States
With the fast development of ad hoc networks, SIP has attracted more and more attention in multimedia service. This paper proposes a new architecture to provide SIP service for ad hoc users, although there is no centralized SIP server deployed. In this solution, we provide the SIP service by the introduction of two nodes: Designated SIP Server (DS) and its Backup Server (BDS). The nodes of ad hoc network designate DS and BDS when they join the session nodes set and when some pre-defined events occur. A new sip message type called REGISTRAR is presented so nodes can send others REGISTRAR message to declare they want to be DS. According to the IP information taken in the message, an algorithm works like the election of DR and BDR in OSPF protocol is used to vote DS and BDS SIP servers. Naturally, the DS will be replaced by BDS when the DS is down for predicable or unpredictable reasons. To facilitate this, the DS should register to the BDS and transfer a backup of the SIP users' database. Considering the possibility DS or BDS may abruptly go down, a special policy is given. When there is no DS and BDS, a new election procedure is triggered just like the startup phase. The paper also describes how SIP works normally in the decentralized model as well as the evaluation of its performance. All sessions based on SIP in ad hoc such as DS voting have been tested in the real experiments within a 500m*500m square area where about 30 random nodes are placed.
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Lu Han, Zhigang Jin, Yantai Shu, Linfang Dong, "Decentralized session initiation protocol solution in ad hoc networks", Proc. SPIE 6387, Next-Generation Communication and Sensor Networks 2006, 63870D (2 October 2006); doi: 10.1117/12.684253; https://doi.org/10.1117/12.684253

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