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

Chiang, Chih-He; Liao, Wanjiun; Liu, Tehuang; Chan, Iam Kin; Chao, Hsi-Lu

doi:10.1109/jsac.2009.090209

Cited by 33 publications

(25 citation statements)

References 11 publications

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“…Chiang et al presented adaptive DL and UL channel split ratio determination in [13]. In this paper, the authors focus on Transmission Control Protocol (TCP)-based traffic and investigate the impact of improper bandwidth allocation to DL and UL channels on the performance of TCP.…”

Section: Related Workmentioning

confidence: 99%

QoS-aware dynamic resource allocation for wireless broadband access networks

Nguyen

Yim

Jeon

et al. 2014

J Wireless Com Network

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The development of the advanced wireless access technologies is focusing on the enhancement of mobile user satisfaction in terms of quality of service (QoS). As the number of mobile users increases, the amount of traffic passing through base station (BS) significantly increases so that the preplanned capacity of downlink or uplink can be exceeded from time to time resulting in the degradation of users' QoS satisfaction. A way to utilize the downlink (DL) and the uplink (UL) of an orthogonal frequency division multiple access frame efficiently is therefore needed subject to users' bandwidth demand which changes continuously over the time. In this paper, we propose a QoS-aware dynamic resource allocation (QDRA) scheme which dynamically adjusts the DL/UL ratio to allocate bandwidth for QoS support to users based on the usage statistics. The performance of the proposed QDRA scheme was examined by applying to the WiMAX standard specifications, to show its superiority of maintaining a higher QoS support for various classes of services compared to the pre-reported adaptive method.

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Section: Related Workmentioning

confidence: 99%

QoS-aware dynamic resource allocation for wireless broadband access networks

Nguyen

Yim

Jeon

et al. 2014

J Wireless Com Network

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“…ABB-General showed better performance in light load network while ABB-Reactive performs better in heavy load network. In addition, some studies on the downlink and uplink bandwidth allocation are also found in [7,8]. In [7], the study focuses on the adaptive ratio between uplink and downlink streams for BE traffic only.…”

Section: Related Research Workmentioning

confidence: 99%

“…It also cooperates with the BS scheduler to throttle the transmission control protocol source when acknowledgements are infrequent to prevent one-way bottleneck. The DL and UL allocations are further enhanced by adjusting the bandwidth ratio of DL to UL adaptively according to the current traffic profile, wireless interference, and transport layer parameters in [8].…”

Section: Related Research Workmentioning

confidence: 99%

“…In bandwidth request and grant process, the SS initializes the process by building the bandwidth request message. The bandwidth request message is composed by counting the size of the queue or by predicting the new packet arrival [8]. The bandwidth request message that contains the information of bandwidth needed for next cycle and the corresponding CID are shown in Figure 1.…”

Section: Ieee 80216 Bandwidth Request and Grant Processmentioning

confidence: 99%

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Discretionary bandwidth granting scheme for homogenous real-time applications

Wee

Roslee

Tan

et al. 2013

J Wireless Com Network

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IEEE 802.16e is an advanced wireless access technology that provides high-speed data transmission in long distance and offers quality of service (QoS) to subscribers. The provisioning of QoS is one of the great features by IEEE 802.16 to support both real-time and non-real-time applications. In IEEE 802.16, the common part sublayer in the MAC layer is responsible for maintaining the QoS services. There are many functions in the common part sublayer; the most popular topics discussed by researchers are the uplink and downlink scheduling algorithms. Many discussions had been made and focused on these two classes of schedulers. Another equally important component but overlooked so far is the bandwidth request and grant module. Bandwidth request and grant module arbitrates the amount of bandwidth to be granted, besides handling the bandwidth requests. This bandwidth request and grant process has always been developed in a conventional way, and its importance has been underestimated. In addition, the bandwidth distribution within a same service class or category also attracted little attention thus far. Many algorithms for interclass scheduling have been studied and proposed but not as much for intraclass scheduling. However, in bandwidth request and grant process, constraints on the required knowledge by the schedulers limit the intraclass scheduling algorithms to be applied onto them. We view the bandwidth request and grant process as an important part of the QoS architecture. In this paper, we proposed a new bandwidth granting scheme for the bandwidth request and granting process, which enables bandwidth to be fairly granted based on the necessity to all the requests from the same service class or category. By applying our scheme, significant improvements have been observed and recorded. Experiment results have proven and confirmed the effectiveness of our proposed scheme as compared to the conventional scheme.

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“…In simulation results, Junsong et al showed that the performance of dynamic TDD is unacceptable due to interference on UL in a cell caused by DL transmissions of other cells when omni-directional antennas are used at BS [2] . Chih-He et al studied the determination of DL-to-UL ratio for TDD-based IEEE 802.16e systems and proposed a scheme that adjusts DL-to-UL ratio according to the current traffic profile, wireless interference, and transport layer parameters in order to maximize the aggregate throughput of TCP based traffic [3] . The following are recent studies on intersystem interference and coexistence scenarios between the different TDD systems in the adjacent spectrum.…”

Section: ⅰ Introductionmentioning

confidence: 99%

On the Coexistence among WiMAX-TDD, TD-LTE, and TD-SCDMA

Cho

Kim²

2010

Journal of electromagnetic engineering and science

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With several advantages such as flexible downlink-to-uplink(DL-to-UL) ratio and flexible spectrum usage, Time Division Duplexing(TDD) is emerging as an alternate to Frequency Division Duplexing(FDD), especially in wireless broadband systems. We already have at least four different TDD systems in the industry: Time Division-Synchronous Code Division Multiple Access(TD-SCDMA), IEEE 802.16e-TDD, IEEE 802.16m-TDD, and Time Division-Long Term Evolution(TD-LTE). A disadvantage of TDD is that tight coordination such as time synchronization between adjacent operators is required to prevent interference between the adjacent TDD systems. In this paper, we investigate coexistence scenarios among the above four well-known TDD systems and calculate spectral efficiency(SE) loss in each scenario. Our findings are that SE loss can be significant if TDD ratios of the adjacent operators are considerably different. However, as long as the TDD ratios of the adjacent operators are similar, configurations in the systems permit perfect time synchronization between the two heterogeneous TDD systems, and the resulting SE loss is zero or reasonably low. We believe that the above findings and the configurations of the TDD systems recommended to minimize SE loss will be helpful for operators who deploy TDD systems in system parameter determination and cross-operator coordination.Key words : TDD, WiMAX, TD-LTE, TD-SCDMA, Coexistence.  Ⅰ. IntroductionFDD has been used as a duplexing scheme for the majority of cellular communication systems including IS-95, cdma2000, wideband code division multiple access (WCDMA), high speed downlink packet access(HS-DPA), high speed uplink packet access(HSUPA), and LTE-FDD. The only TDD-based system that has been meaningful footprint in the industry is TD-SCDMA.Compared with FDD, TDD has several advantages such as flexible DL-to-UL ratio(i.e., TDD ratio), simpler implementation of "smart" antenna techniques, and cheaper transceiver implementation. Consequently, TDD has emerged as another duplexing scheme, especially for wireless broadband systems such as IEEE 802.16e, IEEE 802.16m, and TD-LTE.A disadvantage of TDD is that TDD system performance is significantly degraded when DL and UL signals overlap in time. Therefore, TDD first of all requires time synchronization throughout the network within one operator to prevent performance degradation by this overlap. In addition, TDD requires a large guard band(GB) between the adjacent TDD operators and/or a high level of coordination between the adjacent TDD operators. Coordination to reduce interference between adjacent operators can be accomplished in several ways such as time synchronization, general radio network engineering, transmit power reduction, and tighter filtering. Among them, time synchronization can be an effective coordination method to reduce interference between adjacent operators [10] .Time synchronization between the same TDD systems (e.g., time synchronization between two adjacent IEEE 802.16e systems) is rath...

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

Cited by 33 publications

References 11 publications

QoS-aware dynamic resource allocation for wireless broadband access networks

QoS-aware dynamic resource allocation for wireless broadband access networks

Discretionary bandwidth granting scheme for homogenous real-time applications

On the Coexistence among WiMAX-TDD, TD-LTE, and TD-SCDMA

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