Fixed and dynamic bandwidth allocation strategies for wireless mobile integrated services networks

Abstract

Performance evaluation of two bandwidth allocation strategies in wireless mobile integrated services networks is carried out. Performances of the proposed strategies are compared with those of the traditional guard channels and threshold strategies. In the study, a single wireless cell which is accessed by voice and non-voice traffic types producing, respectively narrowband and wideband calls is considered. In the proposed strategies a number of channels are reserved in a fixed or dynamic fashion for the use of originating wideband calls in addition to the guard channels allocated for the handoff calls. The results indicate that the two strategies have comparable advantages and by manipulating the number of reserved channels, desired performance levels can be achieved. The dynamic reservation based strategy makes the system fairer for the originating wideband calls while maintaining low handoff dropping probability and acceptable channel utilization levels. On the other hand, the fixed reservation strategy provides a lower handoff call dropping at comparable channel utilization levels. The tradeoff is between improving the handoff call dropping versus the originating wideband call blocking. Both strategies provide better performance for the originating wideband calls compared with that provided by the traditional guard channels strategy.

Admission control for adaptive multimedia services based on user and service related knowledge

“…In [10] the authors consider two service categories with different priorities, with additional handoff sessions being considered of high priority as well, thus forming three zones. Considering network load variability, zone limits can be variable as well, e.g., in [11] and [12] there are two different service categories, and the zone limits are dynamically adjusted based on the proportion of higher category sessions. The approach proposed in [13] allows for different possible bandwidth configurations to be assigned to sessions by considering maximum and optional bandwidth values for new sessions.…”