Joint reliability of medium access control and radio link protocol in 3G CDMA systems

    Authors

    M. Chatterjee; G. D. Mandyam;S. K. Das

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Comput.

    Keywords

    radio link protocol; MAC; retransmissions; packet combing; cdma2000; WCDMA; PERFORMANCE; LAYER; TCP; Computer Science, Hardware & Architecture; Engineering, Electrical &; Electronic

    Abstract

    In this paper, we study the reliability as offered jointly by the medium access control (MAC) and the radio link protocol (RLP) for third generation (3G) code division multiple access (CDMA) standards. The retransmission mechanism supported at the RLP layer has a considerable amount of delay (80-100 ms) associated with it; hence, it may not be able to support applications with strict delay requirements. On the other hand, if retransmissions are also performed at a lower layer, such as the MAC layer, then the performance of CDMA systems can be improved because of the fast retransmissions at the MAC layer. We show how the performance of RLP improves with respect to three metrics - mean delay, throughput, and RLP recovery - when a finite number of retransmissions is allowed at the MAC layer. Synthetically generated Web traffic is used as the application, the objects of which are fragmented into equal-sized RLP frames. We consider soft packet combining support at the receiver, which effectively lowers the frame error rate. We also consider the possibility of misinterpretations of acknowledgments. Simulation experiments are conducted to verify the performance as offered jointly by the MAC and the RLP, particularly for cdma2000 standard and wideband CDMA (WCDMA) systems. The improvement in the TCP throughput is also evaluated.

    Journal Title

    Ieee Transactions on Computers

    Volume

    54

    Issue/Number

    12

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    1584

    Last Page

    1597

    WOS Identifier

    WOS:000232532300010

    ISSN

    0018-9340

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