Abstract

Due to the limitation of resources in mobile handheld devices and bandwidth constraints in wireless networks, it is important to efficiently manage image content and traffic to improve network throughput and response time. The efficient distribution of images in wireless networks is based on many parameters like the quality of service requirement, available bandwidth, restricted memory and diverse user profiles. We consider digital images as data objects accessed in a hierarchical mobile ad-hoc peer-to-peer network, referred as M-P2P. Our objective is to optimize the number of replicas of images in such a network architecture based on the resource limitations of the requesting peers equipped with miniature mobile devices as well as of wireless constraints in mobile ad-hoc networks (MANET). While replicating images, fragments of different resolution and their residues are used to optimize the traffic in the network and to decrease the search turnaround time. We call this replication algorithm as Ada-Rep. Performance evaluation is done by simulating Ada-Rep, base replication and uniform replication methods to evaluate parameters such as response time, failure rate, memory usage, traffic etc. Our results prove the efficiency and better performance of Ada-Rep.

Keywords: Adaptive; Mobile peer-to-peer; Searching; Replication

Article Outline

1. Introduction

2. Related work

3. System model

4. Image re-sampling

5. Ada-Rep algorithm

5.1. Costs involved

5.1.1. Transcoding cost (C_s)

5.1.2. Transmission cost (C_t)

5.2. Replication decision

5.3. Replication factor

5.4. Trust values

5.5. Ada-Rep using flooding

5.6. Ada-Rep using multicast

5.7. Application example

5.8. Replication factor calculations

6. Simulation

6.1. Simulation environment

6.2. Simulation results

6.2.1. Flooding and multicast comparison

6.2.1.1. Flooding and multicast average response time

6.2.1.2. Flooding and multicast network traffic

6.2.2. Ada-Rep and base replication scheme comparison

6.2.2.1. Ada-Rep and base replication replica count

6.2.2.2. Ada-Rep and base replication average response time

6.2.2.3. Ada-Rep and base replication memory usage

6.2.2.4. Ada-Rep and base replication hop count

6.2.2.5. Ada-Rep and base replication failure rate

7. Conclusions and future work

References

Vitae