Channel assignment with QoS guarantees for a multiclass multicode CDMA system
| Autor: | Jai-Yong Lee, Mi-Sun Do, Youngjun Park |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Engineering
Channel allocation schemes Computer Networks and Communications business.industry Code division multiple access Quality of service ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Aerospace Engineering Channel capacity Automotive Engineering Telecommunications link Computer Science::Networking and Internet Architecture Wireless Resource allocation Electrical and Electronic Engineering business Computer network Communication channel |
| Zdroj: | IEEE Transactions on Vehicular Technology. 51:935-948 |
| ISSN: | 0018-9545 |
| DOI: | 10.1109/tvt.2002.801766 |
| Popis: | In a wireless system that supports multimedia services, each traffic requires different quality of service (QoS) at both communication on radio links and connection admission. We initially derive the uplink capacity satisfying the QoS constraint on radio links in a multiclass multicode code-division multiple-access (CDMA) system. Based on the derived capacity, the number of channel elements, which is one of the system resources, is determined. Then, we define the QoS parameters associated with connection processes. To guarantee the defined QoS at the connection level, under given channel elements, we propose a channel-assignment scheme with dynamic priority adjustment (DPA). The proposed scheme gives multipriority to different traffic classes. Real-time classes can preempt non-real-time classes with restricted preemptive priority. Such restriction is regulated by preemption-free code channels and a buffer threshold for non-real-time classes. Among real-time classes, different priorities are assigned to each traffic class by code reservation parameters. These multipriority parameters are dynamically adjusted in order to guarantee different QoS requirements. We analyze the DPA scheme by the matrix-geometric method, and evaluate the performance of each traffic class. The results show that the proposed scheme flexibly guarantees QoS depending on traffic loading condition and achieves high channel utilization. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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