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An Enhanced DQRUMA/MC-CDMA Protocol for Wireless Packet Networks
Jae-Yoon PARK Duk-Kyung KIM Dan-Keun SUNG
Publication
IEICE TRANSACTIONS on Communications
Vol.E83-B
No.7
pp.1567-1571 Publication Date: 2000/07/25 Online ISSN:
DOI: Print ISSN: 0916-8516 Type of Manuscript: LETTER Category: Wireless Communication Technology Keyword: multicode, CDMA, MAC, LPRA,
Full Text: PDF(242.4KB)>>
Summary:
The original DQRUMA/MC-CDMA protocol may suffer severe code collisions due to a limited number of request codes. An enhanced DQRUMA/MC-CDMA protocol using minislots for request accesses is proposed to reduce request collisions. In the proposed protocol, request attempts are transmitted concurrently with data packets of other calls. A random scheme (Scheme I) and a designated scheme (Scheme II) are distinguished depending on the methods which select a request code and a request minislot based on a lattice pool for request accesses (LPRA). Both schemes yield low request access delays due to few or no collisions during request accesses. In Scheme I one of request minislots is selected with a randomly chosen code, while in Scheme II the minislot and the code uniquely used in request attempts can resolve a code collision problem during request accesses. The performance of the proposed protocol is evaluated by simulation and the result shows that the proposed protocol outperforms the original DQRUMA/MC-CDMA protocol in terms of average total delay.
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