Dynamic TDMA Slot Assignment in Ad Hoc NetworkAd hoc网络动态TDMA时隙分配.pptVIP

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Dynamic TDMA Slot Assignment in Ad Hoc NetworkAd hoc网络动态TDMA时隙分配.ppt

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Dynamic TDMA Slot Assignment in Ad Hoc NetworkAd hoc网络动态TDMA时隙分配

Dynamic TDMA Slot Assignment in Ad Hoc Network CN EE CCU Speaker: 游千冊 2005/11/29 Outline Introduction USAP USAP-MA Dynamic TDMA Slot Assignment Frame Format Packet Format Slot Assignment Detection of Conflict and its solution Releasing Slot Assignment Performance Evaluation Conclusion Outline Introduction USAP USAP-MA Dynamic TDMA Slot Assignment Frame Format Packet Format Slot Assignment Detection of Conflict and its solution Releasing Slot Assignment Performance Evaluation Conclution Introduction(1/3) Ad hoc network are temporarily constructed by only mobile hosts. TDMA provide the collision-free packet transmission regardless of the traffic load. Traditional TDMA technique do not take into consideration autonomous behaviors of mobile host , and thus they cannot assign time slots for new coming mobile hosts. Introduction(2/3) A few conventional protocols [7,8] that assign time slots for new coming mobile hosts , but the channel utilization is low. Our proposed protocol to improve the channel utilization by changing the frame length dynamically according to the number of mobile hosts in the contention area. Introduction(3/3) Contention area is defined for each mobile host as the set of mobile hosts that can cause collisions of sending packets with each other. Outline Introduction USAP USAP-MA Dynamic TDMA Slot Assignment Frame Format Packet Format Slot Assignment Detection of Conflict and its solution Releasing Slot Assignment Performance Evaluation Conclution Unifying Slot Assignment Protocol(USAP) (1/3) The TDMA format in USAP , which consists of N frames and a frame consists of M slots. N and M are fixed number. NMOP (Net Manager Operational Packet) Unifying Slot Assignment Protocol(USAP) (2/3) NMOP contains the following information. STi(s) : 1: if node i transmits a data packet to its neighbors in slot s, 0: otherwise. SRi(s) : 1: if node i receives a data packet from one of its neighbors in slot s, 0: otherwise. NTi(s) : 1: if node i has neighbors