Hui Deng

Qos-aware resource allocation for mixed multicast and unicast traffic in OFDMA networks

This article focuses on the subchannel and power allocation for mixed multicast and unicast traffic in wireless OFDMA networks, where the multicast data is divided into basic layer and enhancement layer data. Our goal is to maximize the network total throughput with a total power constraint while guaranteeing the minimum rate requirements of both the unicast and muticast traffic. A suboptimal allocation algorithm is proposed, which combines a cost-based subchannel allocation with the traditional water filling (TWF) and an advanced water filling (AWF). The TWF is used for the subchannels allocated to satisfy the rate requirements of each unicast traffic and multicast traffic while the AWF is used for the remaining subchannels. Besides, we present an average SNR-based user selection scheme which selects a proper set of multicast users to serve when the minimum rate requirements of all users can not be satisfied. Simulation results show that our proposed algorithm can improve the network throughput and outage probability compared with other algorithms.

Resource Allocation for Layered Multicast Streaming in Wireless OFDMA Networks

In this paper, we focus on joint subchannel and power allocation for layered multicast streams in OFDMA cellular networks, where the multicast stream is composed of a basic layer and an enhancement layer. Our goal is to maximize the system total throughput with a total power constraint and a minimum rate requirement. A low-complexity allocation algorithm is proposed, which combined a cost-based subchannel allocation (CSA) with the traditional water filling (TWF) for base layer and an advanced water filling (AWF) for enhancement layer. A simplified advanced waterfilling (SWF) algorithm is also developed. Besides, we present a throughput condition-based user selection (TCUS) algorithm which selects a proper set of users to serve when the minimum rate requirement can not be satisfied. Numerical results show that our proposed algorithms improve the system throughput and outage probability over other algorithms.

Auction Based Resource Allocation for Balancing Efficiency and Fairness in OFDMA Relay Networks with Service Differentiation

This paper considers an OFDMA relay network and proposes an auction algorithm for the subchannel allocation to balancing efficiency and fairness with service differentiation. This algorithm allows users to fairly compete for the using of the subchannel through a new bidding strategy. We use the second-price sealed auction mechanism under which the dominant strategy of the bidder is bidding the true valuation of the subchannel. The users valuations to the subchannel are estimated by considering their minimum rate requirements, current channel conditions and the long term average data rates. The active index which can be chosen from the set provided by the system is introduced to differentiate the users willingness to pay for different services. For each subchannel, the user bids highest will be allocated the subchannel. The auction procedure can naturally realize a competitive fairness from the perspective of the users. Simulation results show that the proposed algorithm can achieve different degrees of tradeoff between the system efficiency and fairness by using different active index set, satisfy the users minimum rate requirements and also provide differentiated services for different users.

QoS-Aware Resource Allocation for Mixed Multicast and Unicast Traffic in OFDMA Networks

This paper focuses on the subchannel and power allocation for mixed multicast and unicast traffic in wireless OFDMA networks, where the multicast data is divided into basic layer and enhancement layer data. Our goal is to maximize the network total throughput with a total power constraint while guaranteeing the minimum rate requirement of both the unicast and muticast traffic. A heuristic allocation algorithm is proposed, which combines a cost-based subchannel allocation (CSA) with the traditional water filling (TWF) and an advanced water filling (AWF). The TWF is used for the subchannels allocated to satisfy the rate requirements of each unicast traffic and multicast traffic while the AWF is used for the remaining subchannels. Simulation results show that our proposed algorithm can improve the network throughput and outage probability compared with other algorithms.

A service-driven system architecture with Multi-Domain Collaboration for future wireless communications

In this article, we propose a service-driven architecture for wireless networks that incorporates the concept of multi-domain collaboration. This architecture inherits the physical infrastructure from existing cellular systems, while introducing a CS that configures the overlapped variable logical structure of the system according to service properties through a collaboration algorithm. Simulation results demonstrate that out framework can increase the system throughput up to 75% comparing with traditional cellular systems. Moreover, even if our theoretical analysis and simulations on the MDC architecture are based on single cell scenarios, they can also be applied to multi-cell cases by designing more sophisticated system architectures and algorithms following the same principles.

Reconfiguration of wireless network architecture for supporting high user capacity

Based on the primary physical infrastructure of traditional cellular mobile communication network, this paper provides an overlapped variable logical structure with conventional communication, point to point direct communication and point to multi-point direct communication modes according to the type of services. In particular, a signaling-based reconfiguration technique is proposed to adaptively change the logical topology of network based on the position of mobile stations. Compared with the traditional cellular networks, this method may improve the user capacity and spectrum efficiency with reduced power consumption.

Reconfiguration of Wireless Communications Network Architecture for Supporting Power Efficient Transmission

This article advocates a novel network architecture and associated location-based reconfiguration algorithm for the future wireless communications network. In contrast to the dominating cellular architecture, the new form envisions a logical overlapped framework with traditional cellular communication, centrally controlled short-range communication and Store-Carry-Forward short-range communication modes according to the type of services. Per simulations, the novel architecture with the proposed reconfiguration strategy is confirmed with the improvement of the power efficiency for the network.