Multicast service availability in a hybrid 3g-cellular and ad hoc network

Abstract

Abstroct--In this paper we discuss the advantages and disadvantages with a wireless network consisting of a wide area JG-cellular network and a local area ad hoc network Tbe hybrid network is meant to be used for high dah-rate continuous group services with multicast data distribution. We enumerate the resource gains available from the combined network, and also show how network connectivity and service availability is affected.The results demonstrate that the hybrid network can provide multicast data to a high percentage of the multicast terminals using smaller amount of ceUuIar radio resources, compared with conventional cellular-only system. Index Tm"Multicast, Multimedia, UMTS, Wireless internet, W A N .

Reducing Multicast Traffic Load for Cellular Networks Using Ad Hoc Networks

“…Inspired by the above work for point-to-point (i.e., "unicast") traffic, a number of hybrid architectures have been proposed for group communication applications when the same content is sent to multiple receivers [8,9,16]. In these architectures, proxies (i.e., mobile hosts with high receiving rate) use "multicast" to send packets to a group of users.…”

Multicast in 3G networks:

“…To our knowledge, we were the first to suggest and analyse a heterogeneous multihop access network for multicast traffic [44,40,41]. We believed the possible capacity gain associated with a multihop heterogeneous network could be potentially much better for multicast traffic than for unicast traffic, due to the signalling overhead associated with multihop heterogeneous wireless networking.…”

Reducing Multicast Traffic Load for Cellular Networks using Ad Hoc Networks

“…Hauge et al propose a hybrid network architecture to increase the coverage of high bandwidth group service [8], [9]. Park and Kasera develop a routing algorithm to find ad hoc paths from proxies to cellular multicast receivers [10].…”

“…Inspired by the above work for point-to-point (i.e., "unicast") traffic, a number of hybrid architectures have been proposed to use "multicast" to send packets to multiple receivers [8], [9], [10]. Multicast is an efficient mechanism for point (or multi-point) to multi-point communication, which has been widely used in both wired [11], [12], [13], [14] and wireless networks [15], [16], [17], [18].…”

“…As bandwidth is scare resource for a BS, many groups obviously will overload the BS since all the traffic goes through this "bottleneck" point (we call this communication mode "cellular mode"). To reduce multicast traffic load on BSs, we also propose using ad hoc multicast (called "ad hoc mode") as in [8], [9], [10]. However, due to the capacity limit of the ad hoc network, if all the groups are routed in ad hoc mode, the network may become congested and the performance of these groups may be degraded significantly.…”