Adaptive downlink and uplink channel split ratio determination for TCP-based best effort traffic in TDD-based WiMAX networks

Authors:
Chih-He Chiang;Wanjiun Liao;Tehuang Liu;Iam Kin Chan;Hsi-Lu Chao
Affiliations:
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan;Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan;Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan;Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan;Department of Computer Science and Information Engineering, National Chiao-Tung University, Hsin-Chu, Taiwan
Venue:
IEEE Journal on Selected Areas in Communications - Special issue on broadband access networks: Architectures and protocols
Year:
2009

Citing 8
Cited 1

The effects of asymmetry on TCP performance

Mobile Networks and Applications
Is WiMax's Future Up in the Air?

IEEE Internet Computing
Operational considerations of deploying WiMAX technology as a last-mile tactical communication system

MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Adaptive power allocation and call admission control in multiservice WiMAX access networks [Radio Resource Management and Protocol Engineering for IEEE 802.16]

IEEE Wireless Communications
Feedback-based real-time streaming over WiMax

IEEE Wireless Communications
Adaptive slot allocation in DOCSIS-based CATV networks

IEEE Transactions on Multimedia
IEEE standard 802.16: a technical overview of the WirelessMANTM air interface for broadband wireless access

IEEE Communications Magazine
Broadband wireless access with WiMax/802.16: current performance benchmarks and future potential

IEEE Communications Magazine

Network Performance Analysis of TCP-Based 3GPP LTE Time Division Duplex Systems

Wireless Personal Communications: An International Journal

Quantified Score

Hi-index	0.00

Visualization

Abstract

In this paper, we study the determination of down-link (DL) and uplink (UL) channel split ratio for Time Division Duplex (TDD)-based IEEE 802.16 (WiMAX) wireless networks. In a TDD system, uplink and downlink transmissions share the same frequency at different time intervals. The TDD framing in WiMAX is adaptive in the sense that the downlink to uplink bandwidth ratio may vary with time. In this work, we focus on TCP based traffic and explore the impact of improper bandwidth allocation to DL and UL channels on the performance of TCP. We then propose an Adaptive Split Ratio (ASR) scheme which adjusts the bandwidth ratio of DL to UL adaptively according to the current traffic profile, wireless interference, and transport layer parameters, so as to maximize the aggregate throughput of TCP based traffic. Our scheme can also cooperate with the Base Station (BS) scheduler to throttle the TCP source when acknowledgements (ACKs) are transmitted infrequently. The performance of the proposed ASR scheme is validated via ns-2 simulations. The results show that our scheme outperforms static allocation (such as the default value specified in the WiMAX standard and other possible settings in existing access networks) in terms of higher aggregate throughput and better adaptivity to network dynamics.