Title :
Reliable multicast services using CDMA codes in IEEE 802.16 OFDMA system
Author :
Lee, Howon ; Cho, Dong-Ho
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
fDate :
30 May-1 June 2005
Abstract :
IEEE 802.16 OFDMA (orthogonal frequency division multiple access) system does not support reliable medium access control (MAC) layer multicast services. However, reliable multicast services must be supported in this system, because the status indications based on the ARQ mechanism of the subscriber stations (SSs) are required in some multicast services. Therefore, we propose a new scheme to support reliable MAC layer multicast services using cumulative ACK (CA) code and ARQ feedback request (AFR) code. In this paper, we analyze packet error rate (PER), and required uplink resources in case of our proposed scheme compared with the original scheme using unicast ARQ feedback messages against various wireless channel environments. Through the performance analysis, we can show that our scheme can save a lot of uplink resources compared with the original scheme. Using our proposed scheme, we can support reliable multicast services without a waste of a lot of uplink resources.
Keywords :
WiMax; access protocols; automatic repeat request; code division multiple access; computer network reliability; frequency division multiple access; multicast protocols; wireless channels; ARQ feedback request code; CDMA codes; IEEE 802.16 OFDMA system; orthogonal frequency division multiple access; packet error rate; reliable MAC layer multicast services; subscriber stations; uplink resources; wireless MAN; wireless channel; Automatic repeat request; Downlink; Error analysis; Feedback; Frequency conversion; Media Access Protocol; Multiaccess communication; Physical layer; Telephony; Unicast;
Conference_Titel :
Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st
Print_ISBN :
0-7803-8887-9
DOI :
10.1109/VETECS.2005.1543755
