tailieunhanh - Mobil Ad Hoc Networks Protocol Design Part 16

Tham khảo tài liệu 'mobil ad hoc networks protocol design part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 592 Mobile Ad-Hoc Networks Protocol Design Fig. 10. Average delay with varying the maximum waiting time as and taken from Jaegal Lee 2008 Fig. 11. Flooding completion time with varying the maximum waiting time as and taken from Jaegal Lee 2008 difference occurs in case when wmax . Latency and completion time of FONIAH are considerably lower than those of geoflood as nodes are densely deployed. EEPA achieves rapid delivery throughout the network as fast as blind flooding and it noticeably alleviates the number of transmissions. 5. Conclusion In this chapter we discussed the issues behind supporting efficient broadcasting for MANET and previously published broadcasting schemes. The key argument of efficiency in broadcasting is reducing the amount of overhead introduced during the propagation of a packet to nodes in the network. The reason is that MANET is one of resource-constrained networks such as mobile networks and wireless sensor networks. More precisely collision and contention are likely to occur due to wireless resource sharing under the condition that the resource is strictly limited. In addition to the problems energy consumption is an important consideration. Broadcasting in Mobile Ad Hoc Networks 593 The optimal reliable broadcasting is known as NP-complete even if each node has the global topology information. Hence many of the broadcasting schemes require each node to listen to redundant packets during a short waiting time to examine the necessity of transmission. Since the waiting time may be a factor increasing end-to-end delay some broadcasting schemes employs the concept of a hybrid approach to alleviate delay granting a priority to help a node rebroadcast immediately. With the enhancement of the broadcasting approach the performance has been considerably improved. Unfortunately most broadcasting schemes presented here barely ensure the feasibility and practically in the real world because of the underlying .

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