By Nikos E. Mastorakis
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A cell is a geographical area around an MSS in which it can support an MH. An MH can change its geographical position freely from one cell to another or even to an area covered by no cell. At any given instant of time, an MH may logically belong to only one cell; its current cell defines the MH’s location, and the MH is considered local to the MSS providing wireless coverage in the cell. An MSS has both wired and wireless links and acts as an interface between the static network and a part of the mobile network.
Silva, “Global checkpointing for distributed programs”, Proc. 11th symp. Reliable Distributed Systems, pp. 155-62, Oct. 1992. , “Optimistic Recovery in Distributed Systems”, ACM Trans. Computer Systems, Aug, 1985, pp. 204-226. P. L. Welch,“ Efficient Distributed Recovery Using Message Logging”, Proc. 18th Symp. Principles of Distributed Computing”, pp 223-238, Aug. 1989. , “Error Recovery in multi-computers using global checkpoints”, In Proceedings of the International Conference on Parallel Processing, pp.
Ddv2[1]=1 due to m1; and ddv1[4]=1 due to m2. On the receipt of m0, P2 does not set ddv2 [3] =1, because, P3 has taken its permanent checkpoint after A Minimum-Process Coordinated Checkpointing Protocol… 17 sending m0. We assume that P1 and P2 are in the cell of the same MSS, say MSSin. MSSin computes minset (subset of minimum set) on the basis of ddv vectors maintained at MSSin, which in case of Figure 2 is {P1, P2, P4}. Therefore, P2 sends checkpoint request to P1 and P4. After taking its tentative checkpoint, P1 sends m4 to P3.