Tham khảo tài liệu 'mobile ad hoc networks applications part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Design and Analysis of a Multi-level Location Information Based Routing Scheme for Mobile Ad hoc Networks 481 no. of the node. The previous level no. is required by the new location server region in sending the new relative address of A . current location server id and node id to a location server region in the previous level. This information is then relayed to all the other location server regions in the previous level. Those location server regions after analyzing the current relative address of the node find that the level no. of node A has already changed . node A is no longer in the square region at their level. Therefore they delete the entry corresponding to node A from their database. Fig. 11. Location update for node movement between square regions at different levels The new location server region is in a square region which is at a different level than the level of node A s previous square region. Therefore the new location server region must make a new entry in its location information database about the new fully qualified location information of node A. This new location server region then needs to send the new relative location information of node A to other location server regions within the new square region. These other location servers previously had no location information about node A. Therefore they need to make new entries in their location information database about the new relative location information of node A. Location query Suppose node S wants to send a data packet to a destination node D but the location information of node D is unknown to S. Corresponding to three location update scenarios three situations can evolve. 482 Mobile Ad-Hoc Networks Applications I. Destination D is within same sub-region at same level as of source S In this case the location server region that is in-charge of the sub-region contains the fully qualified address of node D. The source node S sends the data packet to the location server region. The
