一種動(dòng)態(tài)利用碼資源的CDMA系統(tǒng)性能研究
PERFORMANCE EVALUATION FOR DYNAMIC CODE ALLOCATION CDMA SYSTEM
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摘要: 本文提出了一種基于隨機(jī)預(yù)約ALOHA訪問(wèn)方式,能支持話音和數(shù)據(jù)業(yè)務(wù)的動(dòng)態(tài)使用碼資源的碼分多址訪問(wèn)協(xié)議。在該協(xié)議中,話音終端采用預(yù)約請(qǐng)求排隊(duì)訪問(wèn)方式。數(shù)據(jù)終端采用時(shí)隙ALOHA方式傳輸數(shù)據(jù)分組。理論分析和計(jì)算機(jī)仿真結(jié)果表明,該協(xié)議能有效地提高系統(tǒng)碼資源的利用率。在系統(tǒng)處于重負(fù)載情況下該協(xié)議能優(yōu)先保證話音業(yè)務(wù)服務(wù)質(zhì)量,而處于輕負(fù)載下系統(tǒng)碼資源能為數(shù)據(jù)業(yè)務(wù)充分使用。Abstract: A new dynamic code allocation CDMA (DCDMA) protocol,which can support voice and data services simultaneously,is investigated in this paper. In DCDMA protocol, a voice terminal will reserve a spreading code only in talkspurt. The base station assigns a code after successfully receiving a request packet through a special request channel at the beginning of each talkspurt. Unlike a voice terminal,a data terminal must contend a spreading code for each packet transmission. So the code utilization can be significantly improved in DCDMA system. An analytical model and computer simulation is performed for evaluating the performance of the DCDMA protocol. The results show that the DCDMA protocol is very effective in utilizing code resource, and the QOS requirement on voice calls is still satisfied while the number of data terminal is increased.
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Tan Lijun, Zhang Qi Tu. A reservation random-access protocol for voice/data integrated spreadspectrum multiple-Access systems. IEEE J. on Select. Areas Commun., 1996, SAC-14(9): 1717-1727.[2]Fantacci R, Zoppi L. A CDMA wireless packet network for voice-data transmissions. IEEE Trans.on Veh. Technol., 1997, VT-45(10): 1162-1165.[3]Chih Lin I.[J].Gitlin R D. Multi-code CDMA wireless personal communication network.Proc. ICC95, Washington.1060,1995:- -
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