標題: A cross-layer cost-function based rate adaptation mechanism for the WCDMA system with multi-class services by transport format selection
作者: Wang, LC
Chen, MC
Chen, YC
電信工程研究所
Institute of Communications Engineering
關鍵字: rate adaptation;transport format selection;the WCDMA system;cross-layer design
公開日期: 1-六月-2005
摘要: The growing demand of high speed multi-class data transmissions poses new challenges on wireless networks. The major objectives of the next generation wireless networks include: (1) achieving high data throughput in the fast varying wireless channel; (2) transmitting multi-class data by service multiplexing; and (3) controlling the delay for delay sensitive service. To achieve these goals, in the context of wideband code division multiple access (WCDMA) system, we propose a cost-function based rate adaptation mechanism by taking account of both physical layer channel impacts and higher layer performance parameters, such as buffer occupancy and service priority. We implement this cross-layer rate mechanism by exploiting the transport format (TF) selection procedure in the medium access control (MAC) layer of the WCDMA system. Through the proposed cross-layer cost function, the TF selection procedure can dynamically adapt suitable spreading factors every transmission time interval (TTI), usually 10-80 ms. Through simulations in a flat Rayleigh fading channel, we show that the proposed cross-layer cost-function based rate adaptation mechanism can effectively improve throughput and reduce the buffer occupancy for multi-class services for the WCDMA system at the cost of slightly higher power efficiency. Copyright (c) 2005 John Wiley & Sons, Ltd.
URI: http://dx.doi.org/10.1002/wcm.299
http://hdl.handle.net/11536/13613
ISSN: 1530-8669
DOI: 10.1002/wcm.299
期刊: WIRELESS COMMUNICATIONS & MOBILE COMPUTING
Volume: 5
Issue: 4
起始頁: 397
結束頁: 406
顯示於類別:期刊論文


文件中的檔案:

  1. 000230096600003.pdf