We propose a group handover scheme for multiaccess networks that uses adjusted delay to reduce the number of handover blockings that occur during group handover. In a group handover, many users simultaneously start the handover process, which causes network congestion and increases the number of handover blockings. In the proposed scheme, each user in the group handover selects a base station (BS) on the basis of the remaining bandwidth of the BS at that time and initiates the handover process after adjusted delay. To find a strategy for selecting BSs, an optimization problem whose objective is to minimize the probability that handover blocking will occur is formulated, and a solution is derived by using the Karush-Kuhn-Tucker condition. Through performance analysis and simulation results, we show that the probability that handover blocking will occur during group handover is less in our proposed scheme than in a conventional scheme.
Bibliographical noteFunding Information:
Manuscript received February 8, 2010; accepted March 20, 2011. Date of publication May 2, 2011; date of current version June 20, 2011. This work was supported by the IT R&D program of the Ministry of Knowledge Economy/Korea Evaluation Institute of Industrial Technology under Grant KI001835 (5G mobile communication systems based on beam-division multiple access and relays with group cooperation). This paper was presented at the International Communications Conference 2010. The review of this paper was coordinated by Prof. Y.-B. Lin.
All Science Journal Classification (ASJC) codes
- Automotive Engineering
- Aerospace Engineering
- Electrical and Electronic Engineering
- Applied Mathematics