Personal Communications Services Systems Research Articles

Determining the user locations for personal communications services networks

In a personal communications services system, it is required to locate the destination portable when an incoming call arrives. The author proposes a simple location tracking scheme called the T-threshold location cache scheme. In the scheme, a threshold T is used to determine whether a cached location record is obsolete. When the incoming call frequency changes, this scheme adaptively modifies the threshold to yield the best performance. An analytical model is proposed to study the T-threshold scheme. The analysis indicates that the T-threshold scheme effectively reduces the network traffic compared to the IS-41 scheme.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Personal wireless

Personal communication services (PCSs), whereby individuals carry small, inexpensive handheld communicators and can be reached by voice or data with a single phone number, wherever they may be, are discussed. Some early experiments with PCS systems are noted, and problems encountered or anticipated are examined. These include cost, infrastructure, and spectrum issues.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>