Adaptive channel management schemes for wireless communication systems

✍ Scribed by Taieb F. Znati; Sung Jin Kim

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 323 KB
• Volume: 13
• Category: Article
• ISSN: 1074-5351
• DOI: 10.1002/1099-1131(200009)13:6<435::aid-dac463>3.0.co;2-6

✦ Synopsis

Channel management schemes for wireless networks aim typically at minimizing the hand-o! failure probability of on-going calls at the risk of blocking new calls. In a dynamically changing environment, however, such a strategy may increase the likelihood of blocking new calls, unnecessarily. To provide a &better e!ort' quality of service support (QoS) to new calls, while guaranteeing a high level of QoS support for hand-o! calls, this paper proposes a new class of adaptive channel management schemes. The QoS level support is achieved by dynamically adjusting a channel sharing ratio between new and hand-o! calls so that the hand-o! failure probability and the new call blocking probability remain below their respective prede"ned thresholds. Two di!erent schemes are presented, the randomized channel assignment (rCA) scheme and the balanced channel assignment (bCA) scheme. The rCA scheme controls the system's performance so that new calls are allowed to compete randomly with hand-o! calls for excess channels within a cell, without violating the QoS requirements of the hand-o! calls. The bCA scheme takes a di!erent approach and dynamically adjusts the new call admission rate, depending on which type of call, new or hando!, is currently more prevalent within a cell. This approach alleviates the channel assignment scheme from a tight dependency on the underlying tra$c model and re#ects the dynamically changing load within the cell. The performance of the proposed schemes is studied and compared to other channel management schemes proposed in the literature.