ADAPTIVE CACHE INVALIDATION REPORT ALGORITHM BASED ON ADAPTIVE WINDOW(AIRA-AW) FOR CONNECTION AND RECONNECTION PERIODS IN MOBILE ENVIRONMENT

للكاتبين :

Ali I. El-Desouky, Hesham A. Ali, Engy A. El-Shafaiy

Computers and Systems Department, Faculty of Engineering, Mansoura University, Egypt

ABSTRACT

The basic cache consistency strategy is the use of periodic invalidation reports (IRs) broadcast

by the server. Recently, the addition of updated invalidation reports (UIR) has been proposed.

The IR+UIR scheme achieves a much shorter query delay than the basic IR scheme. Previous

researches were based on two impractical simplifying assumptions: 1) broadcast traffic is

error-free and 2) no other downlink traffic exists in the system. IR partitioning reconstruction

lifts these two assumptions on the basic IR and IR+UIR. The (IR partitioning, reconstruction)

achieves the following 1) reduces the probability of corruption in IR, 2) improves channel

utilization, 3) reduces the average delay in other downlink traffic but, there are still some

drawbacks. One of the drawbacks is the problem with long disconnection. So The adaptive

invalidation report algorithm (AIR) can deal with this problem but (AIR) broadcasting

invalidation report segments (IRseg+UIR) or bit sequences (BSs) with fixed window. The

main contribution for this paper is to propose adaptive cache invalidation report that

generates a IR either broadcasting invalidation reports segments (IRseg+UIR) or bit

ADAPTIVE CACHE INVALIDATION REPORT ALGORITHM BASED ON ADAPTIVE WINDOW(AIRA-AW) FOR CONNECTION AND

RECONNECTION PERIODS IN MOBILE ENVIRONMENT

sequences (BSs) with adaptive window at the server, This algorithm is based on a

combination of the advantages of Invalidation Report segments (IRseg+UIR) and bitsequences

(BSs) with adaptive window. Such algorithm will help in improving mobile

caching and reducing the uplink and downlink cost . Simulation results are compared against

the most recent work in this area. This comparison show that, using of the proposed algorithm

has a significant impact on minimizing query delay and data packet delay, moreover it will improve

the number of uplink per successful query.

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