SSDT-site selection diversity transmission power control for CDMA forward link

Furukawa, Hiroshi; Harnage, K.; Ushirokawa, Akihisa

doi:10.1109/49.864018

Cited by 81 publications

(45 citation statements)

References 17 publications

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“…The power control scheme should be differentiated among the BSs by adapting to the radio link gain, interference level, and total transmitted power in each cell [12]. Another implementation of power control differentiation is site selection diversity transmission power control (SSDT) [23]. In SSDT, a BS in the active set is selected dynamically at a time as the primary BS, and transmits to the MS with adequate power, while the output power of other BSs in the active set is held to a minimum level.…”

Section: Coordination In Soft Handoffmentioning

confidence: 99%

Quality-of-service provisioning and efficient resource utilization in CDMA cellular communications

Jiang

Zhuang

Shen

et al. 2006

IEEE J. Select. Areas Commun.

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Abstract-One of the major challenges in supporting multimedia services over Internet protocol (IP)-based code-division multiple-access (CDMA) wireless networks is the quality-of-service (QoS) provisioning with efficient resource utilization. Compared with the circuit-switched voice service in the second-generation CDMA systems (i.e., IS-95), heterogeneous multimedia applications in future IP-based CDMA networks require more complex QoS provisioning and more sophisticated management of the scarce radio resources. This paper provides an overview of the CDMA-related QoS provisioning techniques in the avenues of packet scheduling, power allocation, and network coordination, summarizes state-of-the-art research results, and identifies further research issues.Index Terms-Code-division multiple-access (CDMA), intercell coordination, multimedia services, packet scheduling, power allocation, quality-of-service (QoS), soft handoff.

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Section: Coordination In Soft Handoffmentioning

confidence: 99%

Quality-of-service provisioning and efficient resource utilization in CDMA cellular communications

Jiang

Zhuang

Shen

et al. 2006

IEEE J. Select. Areas Commun.

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“…In the uplink SSD, a received data sequence obtained after channel equalization and despreading at each BS is transferred to the radio network controller (RNC) via the backhaul [13] and the transferred data sequences with the maximum received power is selected. The use of SSD can reduce the inter-cell interference and increase the uplink capacity [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

A Power-Controlled 2-Dimensional Block Spread DS-CDMA Cellular System with Uplink Site Selection Diversity

Liu

Adachi

2007

2007 IEEE 66th Vehicular Technology Conference

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Abstract-2-dimensional (2D) block spread direct sequence-code division multiple access (DS-CDMA) allows uplink mutlirate/mutli-connection transmissions without causing a serious multi-access interference (MAI) in the presence of a frequencyselective fading channel. However, in a cellular system, the intercell interference remains. The site selection diversity (SSD) can be used to reduce the inter-cell interference and increase the uplink capacity. Furthermore, transmit power control (TPC) is necessary to combat the near-far problem. In this paper, we discuss the impact of SSD and TPC on the uplink capacity of 2D block spread DS-CDMA and compare it with those of conventional DS-CDMA and 1D block spread DS-CDMA.Keywords-2-dimensional (2D) block spreading, MAI, SSD, TPC, DS-CDMA, uplink transmission.

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“…In [17] a locally optimal handoff algorithm is derived to approximate the optimal tradeoff between the rate of handoffs, active set size and link quality. In site selection diversity transmission (SSDT) [21] a connection is always served by the BS with the minimum path loss in the active set in order to reduce interference from transmissions of multiple BSs and improve the system capacity. In [12], [13] [14] and [16], soft handoff can only be performed when an MS enters a geographical soft handoff area, which is a distance based one.…”

Section: Introductionmentioning

confidence: 99%

QoS guarantee and power distribution for soft handoff connections in cellular CDMA downlinks

Zhao

Shen²,

Mark³

2006

IEEE Trans. Wireless Commun.

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Abstract-A two-phase power distribution scheme for supporting quality-of-service (QoS) and best effort traffic is proposed. We first formulate the power distribution for QoS traffic as an optimization problem so that the number of simultaneously transmitting connections is maximized. Optimum power distribution is difficult to implement in practice due to both the computational complexity and the requirement for global information about the mobile station (MS) locations, connection channel conditions, and traffic load in the system. We then propose a heuristic scheme of power distribution for soft handoff (SHO) connections. The full scheme includes an initial power distribution (IPD) and a power distribution adjustment (PDA). IPD allocates BS power resource based on the channel condition of each individual connection, while PDA further coordinates the power distribution between neighboring base stations (BSs) in order to accommodate more connections. The proposed power distribution scheme can achieve a capacity close to that of the optimum power distribution, while providing much higher transmission throughput for best effort data traffic. The proposed power distribution scheme can be applied to existing SHO schemes for efficient BS power resource usage. The scheme does not require global information, and its implementation can be further simplified by performing IPD only with slight performance degradation.Index Terms-Cellular CDMA, soft handoff, power distribution, quality of service, optimization.

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SSDT-site selection diversity transmission power control for CDMA forward link

Cited by 81 publications

References 17 publications

Quality-of-service provisioning and efficient resource utilization in CDMA cellular communications

Quality-of-service provisioning and efficient resource utilization in CDMA cellular communications

A Power-Controlled 2-Dimensional Block Spread DS-CDMA Cellular System with Uplink Site Selection Diversity

QoS guarantee and power distribution for soft handoff connections in cellular CDMA downlinks

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