Optimization of Wireless Multicast Systems Employing Hybrid-ARQ with Chase Combining
- Authors
- Kim, Junsu; Jin, Hu; Sung, Dan Keun; Schober, Robert
- Issue Date
- Sep-2010
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Chase combining; hybrid-automatic repeat request (HARQ); throughput optimization; wireless multicast
- Citation
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.59, no.7, pp.3342 - 3355
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
- Volume
- 59
- Number
- 7
- Start Page
- 3342
- End Page
- 3355
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/39569
- DOI
- 10.1109/TVT.2010.2052117
- ISSN
- 0018-9545
- Abstract
- The throughput of conventional wireless multicast systems is limited by the multicast user with the lowest channel quality, which leads to a low throughput, particularly if the number of multicast users is large. In this paper, we show that hybrid-automatic repeat request with Chase combining (HARQ-CC) is a promising technique to overcome this problem and optimize the corresponding transmission rate. We analyze the throughput of wireless multicast systems with HARQ-CC under various channel conditions and derive a closed-form approximation for the optimal rate. The numerical evaluation of our analytical expressions reveals that HARQ-aided multicast outperforms conventional multicast in most channel environments. To further improve performance, we propose a dynamic rate-allocation scheme that combines the advantages of conventional multicast and HARQ-aided multicast.
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