tailieunhanh - Báo cáo hóa học: " Research Article Resource Sharing via Planed Relay for HWN∗"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Resource Sharing via Planed Relay for HWN∗ | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 793126 14 pages doi 2008 793126 Research Article Resource Sharing via Planed Relay for HWN Chong Shen Susan Rea and Dirk Pesch Centre for Adaptive Wireless Systems Department of Electronic Engineering Cork Institute of Technology Ireland Correspondence should be addressed to Chong Shen Received 23 October 2007 Revised 22 February 2008 Accepted 1 April 2008 Recommended by J. Wang We present an improved version of adaptive distributed cross-layer routing algorithm ADCR for hybrid wireless network with dedicated relay stations HWN in this paper. A mobile terminal MT may borrow radio resources that are available thousands mile away via secure multihop RNs where RNs are placed at pre-engineered locations in the network. In rural places such as mountain areas an MT may also communicate with the core network when intermediate MTs act as relay node with mobility. To address cross-layer network layers routing issues the cascaded ADCR establishes routing paths across MTs RNs and cellular base stations BSs and provides appropriate quality of service QoS . We verify the routing performance benefits of HWN over other networks by intensive simulation. Copyright 2008 Chong Shen et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Time Division Multiple Access TDMA -based digital cellular standard global system for mobile GSM was first deployed in 1990 with a new 900-MHz band. However due to uneven nature of the time-varying spatial distribution 1 network performance metrics are not sufficient for today s wireless network where more ad hoc features are being introduced. To effectively manage problems stated above we propose to combine the advantages of different networks so .