Abstract
The most important feature of the mobile network is mobility. Good and continuous service in cellular mobile network can be achieved by using the procedure of handoff (or handover) from one cell to another. Soft handoff is very important feature of cellular Code Division Multiple Access (CDMA) system. In CDMA system a mobile stations (MSs) within a soft handoff region use multiple radio channels and receive their signals from multiple base stations simultaneously. In CDMA cellular system, all cells can also share the same frequency. During handoff procedure, the signaling and voice information from multiple base stations are combined at the mobile switching center (MSC). During the handoff procedure, voice and signaling information must be sent to multiple base stations and the mobile station must combine the results. Within the overlapping area (which is developed by the adjacent cells) of cells, a handset can connect to multiple base stations. In this research paper, a new soft handoff scheme for CDMA cellular network is proposed and investigated. Here we introduce the concept of overlap region between adjacent cells and develop an analytical model for soft handoff in CDMA system. In developed soft handoff model, the balking and reneging behaviors of handoff calls have also considered. Different performance measures of the soft handoff model have developed.
Highlights
The rapid growth in the demand for mobile communications has led to an intense research effort to achieve an efficient use of the scarce spectrum allocated for cellular communications system
When a mobile user moves across a cell boundary[1], the channel in the old base station is released and an idle channel is required in the new base station in which mobile user just going to enter
Soft handoff is an important feature of cellular Code Division Multiple Access (CDMA) system, wherein mobile stations (MSs) within a soft handoff region use multiple radio channels and receive their signals from multiple base stations simultaneously
Summary
The rapid growth in the demand for mobile communications has led to an intense research effort to achieve an efficient use of the scarce spectrum allocated for cellular communications system. Soft handoff is an important feature of cellular CDMA system, wherein mobile stations (MSs) within a soft handoff region use multiple radio channels and receive their signals from multiple base stations simultaneously. Lee et al.[8]-[9] analyzed performance of channel borrowing handoff scheme based on user mobility in CDMA cellular system and studied the soft-handoff mechanism and compares its performance with the hard handoff. The concept of overlap region between adjacent cells and develop an analytical model for hard handoff in CDMA system introduced by Awasthi [22] He discussed the balking and reneging behaviors of calls and found that the blocking probabilities are decreased as number of channels in a cell or service rate increases. We have developed different performance measures like blocking probability of new calls, call incompletion probability, blocking probability of handoff calls etc
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