Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Personal communication systems using multiple hierarchical cellular overlays
IEEE Journal on Selected Areas in Communications
Handoff counting in hierarchical cellular system with overflow scheme
Computer Networks: The International Journal of Computer and Telecommunications Networking
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Using a genetic algorithm approach to solve the dynamic channel-assignment problem
International Journal of Mobile Communications
Managing hotspot regions in wireless/cellular networks with partial coverage picocells
Proceedings of the 6th ACM international symposium on Mobility management and wireless access
Location management scheme with WLAN positioning algorithm for integrated wireless networks
Computer Communications
WSEAS TRANSACTIONS on COMMUNICATIONS
An efficient call delivery algorithm in hierarchical cellular networks
ICUFN'09 Proceedings of the first international conference on Ubiquitous and future networks
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With the increase of teletraffic demands in mobile cellular system, hierarchical cellular systems (HCSs) have been adopted extensively for more efficient channel utilization and better GoS (Grade of Services). A practical issue related to HCS is to design a scheme for controlling and allocating call traffic to different layers. There are several strategies to deal with this problem, such as no call-overflow scheme, unidirectional call-overflow scheme and bidirectional call-overflow scheme. The objective of this paper is to investigate a bidirectional call-overflow scheme, based on the velocity of the mobile making the calls. To ensure that hand off calls are given higher priorities, it is assumed that guard channels are assigned in both macrocells and microcells. In order to evaluate the performance of the new scheme and compare the performance of several related schemes, two new models based on a one-dimensional Markov process are developed and analytical results are derived. Theoretical analysis and numerical evaluation show that the proposed scheme outperforms others in terms of average new call blocking and hand off failure probability of the system. In addition, when the teletraffic to the HCS reaches a certain grade, the GoS is insensitive to the maximum velocity and the velocity threshold which is used to assign calls to different layers in our scheme.