Introducing Handover Prioritization in Channel Borrowing without Locking (CBWL)

R. Zander and J.M. Karlsson (Sweden)

Keywords

Resource Management, Cellular Networks, Traffic En gineering and Control, Handover Prioritization, Channel Borrowing

Abstract

In order to improve the offered quality of service in a cel lular network, load balancing between cells with momen tarily different traffic loads can be applied. This can be ac complished through channel borrowing techniques where a cell requiring extra capacity borrows a channel from a less loaded cell in the same region. However, the bor rowing of a channel results in an alteration of the chan nel reuse pattern. To prevent channels from being locked in some of its dedicated cells due to unacceptable interfer ence levels caused by borrowing, a method where borrowed channels are transmitted with reduced power, called Chan nel Borrowing Without Locking (CBWL), can be applied. In CBWL, borrowed channels are only capable of serving calls in the proximity of the base station, meaning that an intracellular handover is required if one of these calls move to the outer cell area. In this paper, different handover pri oritization methods applicable to CBWL are discussed. It is shown that the efficiency of these methods are highly de pendent on the CBWL parameter settings.

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