Intelligent Paging Strategies for Third Generation Personal Communication Services Networks

We consider the problem of minimizing the paging cost subject to the delay constraint in Personal Communication Services Network (PCSN). Here, we present two intelligent paging strategies for third generation PCSN. They are termed as sequential intelligent paging (SIP) and parallel-o-sequential intelligent paging (PSIP). Both are intelligent in the sense that cell(s) to be paged in a cycle are determined from the occupancy probability vector. Unlike the conventional blanket paging where all cells in a location area are polled at a time, in SIP (PSIP) one cell (a group of cells) is polled at a time. We compare the proposed methods with the conventional approach (such as GSM) in respect of signaling load, polling cost, delay, and discovery rate of mobile terminals. The proposed schemes lead to a decrease in paging signaling load at the cost of some extra processing power. When high intensity traffic is expected, PSIP is preferred to other paging schemes. However, when rate of call arrival is low, SIP performs better when paging cost per cycle is the criterion for choosing a particular scheme of paging. If a better expected discovery rate per cycle is to be achieved, PSIP scheme should be chosen. The efficacy of these two intelligent paging strategies is shown with the help of simulation results.