Tham khảo tài liệu 'wireless mesh networks 2010 part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Virtual Home Region Multi-hash Location Management Service VIMLOC for Large-Scale Wireless Mesh Networks 229 Efficiency Factor EF The EF is defined for both the LU and the LR procedures as the ratio between the number of useful one-hop transmissions and the number of overall one-hop transmissions. The number of useful one-hop transmissions is equal to the number of hops of the most efficient path followed to deliver a packet to the appropriate location server node. The number of overall one-hop transmissions means the total number of hops used in the LU LR procedure . this is the CC. With this parameter we try to capture the how inefficient in terms of wasted transmissions . by flooding each of the schemes. The expression for calculation of the EF is the same for both the LU and LR procedures and can be defined as follow UHTLU Lr EFlu LR r LU LR 9 CCLU LR where UHTịỉị LR is the number of useful one-hop transmissions for LU or LR procedures. It is determined from the corresponding tables of capture files where the number of useful hops traversed by successfully received location update reply packets may be counted by means of the initial and final values of TTL carried in packets. In the case of VIMLOC this parameter is the sum of the number of useful one-hop transmissions for packets received by nodes belonging to VGCs and HGCs. State Volume SV The SV is measured as the average number of entries in the location database of a node. And it is defined just for the proactive scheme from the file and VIMLOC from the and the files since the reactive scheme does not contain a location database. Successful Communication Complexity SCC The SCC is the average number of one-hop transmissions required to have a successful reception of either 1 one location update packet for the proactive scheme and the VIMLOC-LU procedure or 2 one location reply packet for the reactive scheme and VIMLOC-LR procedure. 6. Results and
