Data Traffic Control and Capacity Evaluations for Voice/Data Integrated Transmission in DS-CDMA(Special Issue on Third Generation Land Mobile Communication Systems)

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The next generation mobile communications systems must support multimedia communications services as well as conventional voice service. DS-CDMA is regarded as the most promising candidate, because it is indispensable to cope with multimedia. The system capacity of DS-CDMA system is limited by the total interference level. As a result, in DS-CDMA systems many users suffer very poor communication quality if the total interference level exceeds this limit. Therefore, this paper considers smoothing interference fluctuationusing the difference between voice and data in a type of QoS(quality of service). In other words, voice communication is suitable for a loss system because the quality of voice communication is delay-sensitive. On the other hand, data communication is suitable fora waiting system because the quality of data communication is non-delay-sensitive. This paper focuses on a systemthat applies a circuit switching method for voice traffic and a reservationtype packet switching method for datatraffic and proposes a data traffic control method. In this proposed data traffic control method, a base station controls data transmission from a mobile station to utilize unused voice traffic resources. As a result, the proposed method achieves highly efficient use of the radio spectra by smoothing interference fluctuation in DS-CDMA systems. This paper evaluates the performance level of the proposed method froma system capacity standpoint. It is shown that the proposed method achieveshigher system capacity in voice/data integrated transmission.
社団法人電子情報通信学会の論文
1998-07-25

Data Traffic Control and Capacity Evaluations for Voice/Data Integrated Transmission in DS-CDMA(Special Issue on Third Generation Land Mobile Communication Systems)

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