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Fig. 4 | EURASIP Journal on Wireless Communications and Networking

Fig. 4

From: Performance evaluation and comparison study of adaptive MANET service location and discovery protocols for highly dynamic environments

Fig. 4

Services reliability versus Overhead. Figure shows the message overhead of all four protocols under study. These results were collected when increasing the percentage of servers offering the same service from 5 to 50 for low and high SDQ rates. For low rates of SDQ messages, a variation of \(N_{\mathrm{srv}}\) does not seem to have a major impact on the MSLD protocol running in a unicast mode and the Dir-based protocol. On the other hand, the \(N_{\mathrm{srv}}\) seems to have an impact on the number of control messages since all servers having the requested service are expected to respond with an SDY messages for every service request being originated leading to more overhead as \(N_{\mathrm{srv}}\) increases. Same behavior is witnessed for PDP except the case where the cache has information about the requested service and only devices with higher energy may respond on behalf of low-energy nodes. Conversely, at higher SDQ rates, when the number of servers offering a similar service increases, there will be a higher chance of re-requesting the same service, and hence message overhead decreases because of higher cache hits. PDP has maximum performance gain because of SDY broadcasts, which well-populate node cache

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