1. 1 Chapter 13: Hybrid Wireless Networks  Introduction  Next-Generation Hybrid Wireless Architectures  Routing in Hybrid Wireless Networks  Pricing in Multi-hop Wireless Networks  Power Control Schemes in Hybrid Wireless Networks  Load balancing in Hybrid Wireless Networks

2. 2 Introduction  Next-generation wireless systems are expected to support a wide range of advanced services: Support both data and voice traffic Cellular systems: 1G focused on efficient frequency usage for voice transmission. 2G focuses on efficient spectrum usage for voice transmission. 3G focuses on efficient data traffic. Hybrid wireless network architectures combine multi-hop radio relaying and infrastructure support to provide high-capacity wireless networks.  Next-generation hybrid wireless architectures Multi-hop cellular network (MCN) Integrated cellular and ad hoc replaying system (iCAR) Hybrid wireless network (HWN) Self-organization packet radio networks with overlay (SOPRANO) Multi-power architecture for cellular networks (MuPAC) Throughput enhanced wireless in local loop (TWiLL)

3. 3 Classification of Hybrid Architecures  Systems with host-cum-relay (host-Cumulative-relay) stations The dedicated relay stations do not originate data traffic on their own and assist in forwarding on behalf of the sender. Single-Mode systems: MHs operate only multi-hop mode. Multi-Mode Systems: the mobile hosts act either in single-hop mode or in multi-hop mode depending on the architecture. High-mobility systems Limited-mobility systems  Systems with dedicated relay stations Dedicated relay stations are used for relaying data traffic. Single-mode systems Multi-mode systems