Bidirectional bandwidth allocation for TCP performance enhancement in mobile WiMAX networks

Park, Kyung‐Joon; Kim, Hwangnam; Kim, Han-Seok

doi:10.1109/pimrc.2008.4699745

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…16 MAC, and analyze the performance degradation in the downlink TCP flow that results from the bandwidth allocation for the uplink TCP ACK, (2) we propose the bidirectional bandwidth allocation aiming at increasing the throughput of the downlink TCP flow without decreasing the efficiency of the uplink bandwidth allocation, (3) the proposed approach is transparent to a scheduling algorithm, i.e., any advanced downlink/uplink scheduling algorithm can be incorporated into the proposed framework to improve efficiency or QoS. This study extends the preliminary version [13] by deriving an analytical model to study the effect of the bandwidth-request delay on the TCP throughput, it also includes an extensive simulation study.…”

Section: Introductionmentioning

confidence: 94%

TCP-aware bidirectional bandwidth allocation in IEEE 802.16 networks

Park

Kim

2010

Wireless Netw

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In this paper, we propose a bidirectional bandwidth-allocation mechanism to improve TCP performance in the IEEE 802.16 broadband wireless access networks. By coupling the bandwidth allocation for uplink and downlink connections, the proposed mechanism increases the throughput of the downlink TCP flow and it enhances the efficiency of uplink bandwidth allocation for the TCP acknowledgment (ACK). According to the IEEE 802.16 standard, when serving a downlink TCP flow, the transmission of the uplink ACK, which is performed over a separate unidirectional connection, incurs additional bandwidth-request/allocation delay. Thus, it increases the round trip time of the downlink TCP flow and results in the decrease of throughput accordingly. First, we derive an analytical model to investigate the effect of the uplink bandwidth-request/allocation delay on the downlink TCP throughput. Second, we propose a simple, yet effective, bidirectional bandwidth-allocation scheme that combines proactive bandwidth allocation with piggyback bandwidth request. The proposed scheme reduces unnecessary bandwidth-request delay and the relevant signaling overhead due to proactive allocation; meanwhile, it maintains high efficiency of uplink bandwidth usage by using piggyback request. Moreover, our proposed scheme is quite simple and practical; it can be simply implemented in the base station without requiring any modification in the subscriber stations or resorting to any cross-layer signaling mechanisms. The simulation results ascertain that the proposed approach significantly increases the downlink TCP throughput and the uplink bandwidth efficiency.

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Section: Introductionmentioning

confidence: 94%

TCP-aware bidirectional bandwidth allocation in IEEE 802.16 networks

Park

Kim

2010

Wireless Netw

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“…The performance is validated via ns-2 simulations and results show that this scheme outperforms static allocation in terms of higher aggregate throughput. Also Eun-Chan Park, et al [11] proposed a hybrid approach combining proactive bandwidth allocation with piggyback bandwidth request. The algorithm is taking TCP characteristic into account like TCP data and TCP ACK.…”

Section: Relatedworkmentioning

confidence: 99%

An Efficient Bandwidth Management algorithm for WiMAX (IEEE 802.16) wireless network: EBM allocation algorithm

Gupta

Chandavarkar

2012

2012 IEEE 7th International Conference on Industrial and Information Systems (ICIIS)

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IEEE 802.16 WiMAX (Worldwide Interoperability for Microwave Access) consists of five service classes with different priorities. The priority of real time traffic is higher than that of non-real time traffic. Since bandwidth is limited, it must be allocated in advance to guarantee the throughput of real time traffic in WiMAX network. But WiMAX standard does not provide any algorithm for dynamic allocation of bandwidth to these services. In this paper, a dynamic bandwidth allocation algorithm for WiMAX called Efficient Bandwidth Management (EBM) is proposed. In EBM the bandwidth will be increased in the upcoming frames when the allocated bandwidth is not sufficient to transfer the data. On the other side if the allocated bandwidth is more, then the bandwidth will be decreased in the upcoming frames so that the other services can use this excess bandwidth. This bandwidth increase or decrease is proportional to the remaining data in the queue. EBM increase the throughput of real time traffic as the bandwidth is handled efficiently. The proposed algorithm is implemented in ns-2 and results are compared with traditional IEEE 802.16 WiMAX. The simulation results show that EBM algorithm gives better result for real-time traffic.

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