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Recent technology innovations have increased the study on wireless LAN (Local Area Network), Also, improved computing power of end user has needed the distributed communication environment. However, conventional access protocols (TDMA, CSMA/CA and CDMA) have some problems such as the degradation of channel utilization, necessity of control station and code reuse. Therefore, we propose new multiple access schemes, ‘Hybrid Reservation CDMA protocol’ based on previous DR_CDMA protocol. Proposed protocol for distributed/central wireless LAN architecture could support distributed access mechanism, code reuse method and internetworking method for conventional wire-based LAN. In proposed mechanism, efficient channel utilization could be obtained by minimizing overhead. Also, variable legth frame from upper layer could be transmitted without segmentation. Moreover. proposed method has a merit with respect to interworking and nodes are serviced based on priority. In the view of management, insertion of new node could be done easily in proposed reservation CDMA protocols due to its variable length property which can encapsulate conventional LAN frame. According to computer simulation, it has been shown performances of proposed method is better than those of reservation TDMA bitmap protocol with respect to delay and throughput characteristics in the distributed environments as well as interworking environments between wire and wireless LAN. Also, proposed method shows an efficient channel utilization characteristics by removing the overhead which degrades optimal channel utilization in centralized wireless LAN.

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Abstract

Ⅰ. Introduction

Ⅱ. Conventional Multiple Access Schemes

Ⅲ. Proposed Hybrid Reservation CDMA Method (HR_CDMA)

Ⅳ. Simulation Environments And Result Analysis

Ⅴ. Conclusions

References

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UCI(KEPA) : I410-ECN-0101-2009-569-017763905