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Piggybacking Scheme of Map IE for Minimizing MAC Overhead in the 802.16e OFDMA System

Piggybacking Scheme of Map IE for Minimizing MAC Overhead in the 802.16e OFDMA System. JuYeop Kim and Dong-Ho Cho Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology VTC2007. Outline. Introduction The IEEE 802.16e System

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Piggybacking Scheme of Map IE for Minimizing MAC Overhead in the 802.16e OFDMA System

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  1. Piggybacking Scheme of Map IE for Minimizing MAC Overhead in the 802.16e OFDMA System JuYeop Kim and Dong-Ho Cho Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology VTC2007

  2. Outline • Introduction • The IEEE 802.16e System • MAC Overhead & MAC Message • Piggyback MAP_IE on Data Transmission • Analysis & Simulation • Conclusion

  3. Introduction • The IEEE 802.16e system, fixed and mobile broadband wireless access system, employs various schemes to handle radio resource • The IEEE 802.16e system suffers critical problem • the huge MAC overhead • Radio resource used for managing MAC protocol • Eg: OFDMA, AMC …scheme. • Require additional control signalling

  4. Related Work • The [1] reveal MAC overhead of IEEE 802.16e can be up to 60% • [1] Taesoo Kwon, et al, ”Design and Implementation of a Simulator Based on a Cross-Layer Protocol between MAC and PHY Layers in a WiBro Compatible IEEE 802.16e OFDMA System,” IEEE Communication Magazine • The [2] analyzed the MAC efficiency and refers the importance of MAC reduction • [2] Ariton E. Xhafa, et. al, ”MAC Performance of IEEE 802.16e,” IEEE Vehicular Technology Conference 2005 Fall • The [3] propose a scheduling algorithm which reduce the size of the MAC message for relieving the MAC overhead problem • [3] Juhee Kim, et al, ”A New Efficient BS Scheduler and Scheduling Algorithm in WiBro Systems,”International Conference on Advanced Communication Technology 2006

  5. Ｋ N S The length and MCS level of MAP The IEEE 802.16e System

  6. UL Basic information fields size DL Basic information fields size UL_MAP IE information fields size (include bc) DL_MAP IE information fields size CID information fields size IEEE 802.16e System

  7. The DL IE of j’th burst in frame i The number of j’th burst’s connection in frame i The number of DL connection scheduled in frame i MAC Overhead & MAC Message • A.DL_MAP

  8. The number of UL connection scheduled in frame i MAC Overhead & MAC Message • B.UL_MAP

  9. The average number of resource units per bit used for transmitting broadcasting messages in frame i The average number of resource units per bit used for transmitting broadcasting messages in frame i bdo+ buo • C.MAC overhead due to MAP messages

  10. The average number of resource units per bit used for transmitting broadcasting messages in frame i

  11. The simulation’s parameters are based on the [4] and [9] • [4]IEEE Std 802.16e, ”Part16: Air interface for Fixed Broadband Wireless Access Systems,” February 2006. • [9]Doug Gray, et al, ”Mobile WiMAX - Part I: A Technical Overview and Performance Evaluation,” WiMAX Forum

  12. Piggyback MAP IE On Data Transmission • N : the set of frame • S : the set of CID • IE(i,j) : the MAP_IE describing the data burst for CID j in frame I • Du(i.j) : the number of downlink subcarriers per bit need for data transmission to user j in frame i

  13. The resource for piggybacked DL_MAP_IEs The amount of the radio resource use for piggybacked MAP_IE in frame i The resource for piggybacked UL_MAP_IEs The average amount of resource used for MAP transmission The total size of MAP_IE ( which are not delivered properly and retransmission in frame i Packet error rate Analysis and Simulation

  14. The average amount of the resource saved by the proposed scheme

  15. Conclusion • This paper propose the piggybacked scheme which increases the data rate of MAP_IE messages and reduces the MAC overhead. • The analysis and simulation result show that the scheme improve goodput 30% in ideal case.

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