Distributed resource allocation for DS-CDMA-based multimedia ad hoc wireless LANs

Abstract

Power control in direct sequence-coded vision multiple access (DS-CDMA) systems and, more recently, power/rate allocation in multirate DS-CDMA based networks is an open and interesting research area which has attracted much attention. However, with a few exceptions, most researchers have emphasized centralized resource allocation algorithms for cellular systems where the base station keeps track of the requirements of the various users and is thus responsible for the management of network resources. Ad hoc wireless local area networks (WLAN's), on the other hand, are generally configured as peerto-peer networks with no centralized hub or controller. Thus resource allocation has to be conducted in a distributed fashion. We address the issue of distributed resource management for multirate DS-CDMA based multimedia WLAN's by 1) presenting a distributed resource allocation protocol, known as distributed resource negotiation protocol (DRNP) that builds on the RTS/CTS bandwidth reservation mechanism provided by IEEE 802.111, and provides quality of service (QoS) guarantees through distributed control of resources in DS-CDMA based multimedia WLAN's and 2) investigating the performance of various resource allocation schemes within the context of DRNP, in terms of network wide metrics such as overall throughput and blocking rates.

Minimum Power Architecture of Relay-Based Network with Bandwidth and Hop-Count Constraints

“…QCMP CAHAN has a hybrid architecture that comprises ad hoc network model and cellular network model. In the ad hoc network model of QCMP CAHAN, we use a multirate CDMA protocol with request-to-send/clear-to-send bandwidth reservation mechanism as the medium access technique [7]. When operating in the ad hoc mode, a MT has a radio transmission range, which we refer to as the ad hoc communication range.…”

“…The QoS requirements can be expressed in terms of several important parameters. Bandwidth (throughput) and hop count and are the important parameters in QoS requirements [7]. Especially, provisioning of QoS for multimedia traffic in wireless networks is complicated due to user mobility and limited wireless resources.…”

A multiservice WLAN using a radio resource scheduler

“…Code division multiple access (CDMA) has received considerable attention as a multiple access scheme for wireless local area networks (WLAN) [1,2]. In addition, heterogeneous services, entailing multirate transmission, are now feasible due to the rapid evolution of technology that offers a wide bandwidth capable of handling these multirate transmissions and fulfilling good quality of service (QoS) requirements.…”