Load balancing exploiting P2P technology for softswitch system

Abstract

As the core of current telecommunication Networks, Softswitch system plays an important role in communication networks. However, current Softswitch system still faces some challenges. Firstly its subscriber database, i.e., HLR, is a centralized network entity which may have the problem of the single point of failure and poor scalability; Secondly, current MSC Pool strategy cannot achieve the load balancing inter-domain; Thirdly, the existing disaster recovery and load balancing technologies can't handle tremendous traffic variance (neither R4 nor IMS) due to unpredictability of burst load. In this paper, we propose an architecture of distributed Softswitch system exploiting P2P technology. Based on the P2P Softswitch system, it can naturally eliminate the problem of database's single point of failure by distributing users' data. Besides, we design a geographical awareness algorithm achieving load balancing both intra-domain and inter-domain and reduce the delay in the registration and session setup. Our simulation results show that our algorithm can achieve the load balancing both intradomain and inter-domain. When the calling number is 6 times of the daily in certain area with the neighbors 3, it is able to serve 100% of the calling attempts; when the calling number is even 17 times of the daily in certain area, it is still able to serve 62.8% of the calling attempts fully utilizing the remaining capacity of inter-domain neighbors and having the less effect to the other domains.