DCIM: DISTRIBUTED CACHE
METHOD FOR MAINTAINING CACHE
WIRELESS MOBILE NETWORKS
In mobile ad hoc networks (MANETs) DCIM that is totally
DCIM is a pull-based algorithm that implements adaptive
time to live (TTL), piggybacking, and pre-fetching, and
provides near strong consistency capabilities.
Cached data items are assigned adaptive TTL values that
correspond to their update rates at the data source, where
items with expired TTL values are grouped in validation
requests to the data source to refresh them, whereas unexpired
ones but with high request rates are pre-fetched from the
DCIM is analyzed to assess the delay and bandwidth gains (or
costs) when compared to polling every time and push-based
PROPOSED SYSTEM :
Hybrid mechanisms (Client – server Authentication)
Time to live (TTL)
A data which stores in cache will be expired if it
has not used within threshold time since last
Simplicity, good performance, flexibility to assign
OVERALL BLOCK DIAGRAM :
ServerQD (query directories) Caching nodes
1. Cache Consistency Algorithm
2. Time to live
3. Bit sequence Algorithm
MD5 – Algorithm
1. Design of caching architecture
2. Parameter functions of COACS in MANETs
3. Client- Server Update Mechanism
4. Implementation of MD5 algorithm
5. Performance Analysis
 T. Andrel and A. Yasinsac, “On Credibility of MANET
Simulations,” IEEE Computer, vol. 39, no. 7, pp. 48-54, July
 H. Artail, H. Safa, K. Mershad, Z. Abou-Atme, and N.
Sulieman, “COACS: A Cooperative and Adaptive Caching
System for MANETS,” IEEE Trans. Mobile Computing, vol.
7, no. 8, pp. 961- 977, Aug. 2008.
 D. Barbara and T. Imielinski, “Sleepers and Workaholics:
Caching Strategies for Mobile Environments,” Proc. ACM
SIGMOD, pp. 1- 12, May 1994.
 G. Cao, “A Scalable Low-Latency Cache Invalidation Strategy
for Mobile Environments,” IEEE Trans. Knowledge and Data
Eng.,vol. 15, no. 5, pp. 1251-1265, Sept./Oct. 2003.
 D. Li, P. Cao, and M. Dahlin, “WCIP: Web Cache Invalidation
Protocol,” IETF Internet draft, http://tools.ietf.org/html/draft-
danli-wrec-wcip-01 , Mar. 2001.