Power control for variable QOS on a CDMA channel

Yun, Louis C.; Messerschmitt, David G.

doi:10.1109/milcom.1994.473953

Cited by 98 publications

(58 citation statements)

References 13 publications

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“…Let W be the chip rate, which is fixed and equal to 3.84 Mcps for WCDMA. The bitenergy-to-noise-density ratio, E b /N0, at a receiver (either mobile host or base station) is given by [3,22] …”

Section: Resource Usage In Cdmamentioning

confidence: 99%

“…The value of the bit-energy-to-noise-density ratio (E b /N0)i corresponds to the signal quality, since it determines the bit error rate, BER [3,22]. Under the realistic assumption of additive white Gaussian noise, BER is a non-decreasing function of E b /N0, which depends on the multipath characteristics, and the modulation and forward error correction (FEC) algorithms.…”

Section: Resource Usage In Cdmamentioning

confidence: 99%

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Resource control for elastic traffic in CDMA networks

Siris¹

2002

Proceedings of the 8th Annual International Conference on Mobile Computing and Networking - MobiCom '02

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We present a framework for resource control in CDMA networks carrying elastic traffic, considering both the uplink and the downlink direction. The framework is based on microeconomics and congestion pricing, and seeks to exploit the joint control of the transmission rate and the signal quality in order to achieve efficient utilization of network resources, in a distributed and decentralized manner. An important feature of the framework is that it incorporates both the congestion for shared resources in wireless and wired networks, and the cost of battery power at mobile hosts. We prove that for elastic traffic, where users value only their average throughput, the user's net utility maximization problem can be decomposed into two simpler problems: one involving the selection of the optimal signal quality, and one involving the selection of the optimal transmission rate. Based on this result, the selection of signal quality can be performed as done today using outer loop power control, while rate adaptation can be integrated with rate adaptation at the transport layer.

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Section: Resource Usage In Cdmamentioning

confidence: 99%

Section: Resource Usage In Cdmamentioning

confidence: 99%

Resource control for elastic traffic in CDMA networks

Siris¹

2002

Proceedings of the 8th Annual International Conference on Mobile Computing and Networking - MobiCom '02

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“…We consider a DS-CDMA system that supports variable QoS for VoIP users via the optimal power control algorithm in [12]. The algorithm presented in this paper is optimum in the sense that it minimizes the interference each user experiences from other users (within a given cell), while satisfying each user's reliability requirement.…”

Section: Reduced Traffic Capacitymentioning

confidence: 99%

“…Equation (15) expresses the reliability requirement in terms of the energyto-interference ratio. For a DS-CDMA system, we can approximate the sum of interference from other users and along multiple propagation paths as being additive white, Gaussian noise (AWGN) [12,13,14]. A fading channel and interference from adjacent cells complicates the analysis, but we can still achieve an error performance that approaches an AWGN approximation with the right techniques to mitigate distortion and provide diversity [11].…”

Section: Reduced Traffic Capacitymentioning

confidence: 99%

The Impact of Confidentiality on Quality of Service in Heterogeneous Voice over IP Networks

Reason¹,

Messerschmitt²

2001

Management of Multimedia on the Internet

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Abstract. With the advent of ubiquitous access to multimedia content via wireless networks, users are more likely to have their data traverse a heterogeneous internetwork. Given the open nature of the Internet and wireless links, more users will demand end-to-end confidentiality. However, because of inherent error-expansion properties of secret-key encryption, it is a challenge to provide good subjective quality and end-to-end confidentiality for multimedia data, particularly in network environments subject to both loss and corruption impairments. This paper analyzes the affect end-to-end confidentiality has on the quality of service (QoS) in Voice over IP (VoIP) networks. To satisfy a given QoS objective, we show that mitigating the error-expansion caused by confidentiality comes at a cost. We measure this cost by increased delay, reduced bandwidth, and reduced traffic capacity. Thus, for this class of applications, we motivate the need for error-robust encryption and introduce one such technique in this paper.

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“…Two different frequency bands are assumed to be used in the two-hop network in order to decouple the two hops: the license-exempt band in the first hop (relayee to relayer) and the cellular band in the second hop (relayer to the BS). The second hop of the two-hop CDMA network is in effect identical to the reverse-link of a conventional single-hop CDMA network; in both cases there exist a single many-to-one link (from interference management point of view), for which the power allocation is well known [2].…”

Section: Introductionmentioning

confidence: 99%

Reverse-link power allocation in two-hop multimedia CDMA networks

Walsh

Yanıkömeroğlu

Canadian Conference on Electrical and Computer Engineering 2004 (IEEE Cat. No.04CH37513)

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-Recently there has been significant interest in augmenting the cellular networks with the multihop capability to obtain better high data rate performance in the context of enhanced-3G and beyond-3G networks. This paper deals with the power allocation strategies in the reverse-link of two-hop multimedia CDMA networks. In this envisioned network, the WTs (wireless terminals) which cannot establish a direct link with the BS (at the required rates) seek the assistance of those WTs which can; in other words, whenever needed, some WTs are used as relayers for some other WTs (relayees) if this is possible. In a two-hop link, the first hop (relayee to relayer) uses the unlicensed band and the second hop (relayer to BS) uses the cellular band. This arrangement not only guarantees that no additional expensive cellular spectrum will be used to facilitate a two-hop link, but it also guarantees that if anything goes wrong in the first hop, this will not affect the performance of the WTs which directly communicate with the BS in the cellular band.The performance of any CDMA network depends on the implementation of a good power allocation and control scheme. The optimum power allocation and control in the reverse link of the conventional single-hop CDMA networks is well known. The main contribution of this paper is the development of a good power allocation scheme (which is tied to the proper selection of relayers) in the first hop of the two-hop reverse-link of the envisioned CDMA network. It is worth emphasizing that the nature of the reverse-link power allocation problem is very different in the many one-to-one links (or possibly numerous several-to-one links) which collectively constitute the first hop of the two-hop CDMA network under consideration, in comparison to that in the single many-to-one link in the reverse link of a conventional single-hop CDMA network.The simulation results show that the two-hop relaying, facilitated with the developed novel power allocation scheme, yields considerable enhancements in the CDMA cell capacity, coverage, and throughput.

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Power control for variable QOS on a CDMA channel

Cited by 98 publications

References 13 publications

Resource control for elastic traffic in CDMA networks

Resource control for elastic traffic in CDMA networks

The Impact of Confidentiality on Quality of Service in Heterogeneous Voice over IP Networks

Reverse-link power allocation in two-hop multimedia CDMA networks

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