Developments in third generation (3G) CDMA technology

Jou, Yu-Cheun

doi:10.1109/isssta.2000.876476

Cited by 13 publications

(6 citation statements)

References 1 publication

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“…We also compare the performance of our algorithm with that of a TDMA type of multiple access, which is an optimal strategy when there is no constraint on the maximum data rate for each mobile [3], [4]. Such a strategy is also adopted in the IS-856 system (i.e., HDR) [8]- [10]. In this system, the downlink transmissions are time multiplexed and in each time slot, the base-station transmits to only one mobile.…”

Section: A Power and Rate Allocationmentioning

confidence: 99%

“…Hence, at the same number of mobiles, a smaller value of indicates a higher degree of "unbalancedness" of the system. In addition, we assume that in (10), which implies that at the SINR-based base-station assignment, each mobile is assigned to the closest base-station from it. In Figs.…”

Section: B Base-station Assignmentmentioning

confidence: 99%

“…Their results also show that, in this case, the TDMA type of strategy is an optimal multiple access strategy. This strategy is used in the IS-856 system [8], which is also known as high data rate (HDR) [9], [10].…”

mentioning

confidence: 99%

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Joint resource allocation and base-station assignment for the downlink in CDMA networks

Lee

Mazumdar

Shroff

2006

IEEE/ACM Trans. Networking

120

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In this paper, we jointly consider the resource allocation and base-station assignment problems for the downlink in CDMA networks that could carry heterogeneous data services. We first study a joint power and rate allocation problem that attempts to maximize the expected throughput of the system. This problem is inherently difficult because it is in fact a nonconvex optimization problem. To solve this problem, we develop a distributed algorithm based on dynamic pricing. This algorithm provides a power and rate allocation that is asymptotically optimal in the number of mobiles. We also study the effect of various factors on the development of efficient resource allocation strategies. Finally, using the outcome of the power and rate allocation algorithm, we develop a pricing-based base-station assignment algorithm that results in an overall joint resource allocation and base-station assignment. In this algorithm, a base-station is assigned to each mobile taking into account the congestion level of the base-station as well as the transmission environment of the mobile.Index Terms-Base-station assignment, CDMA networks, nonconvex optimization, power and rate allocation, pricing.

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Section: A Power and Rate Allocationmentioning

confidence: 99%

Section: B Base-station Assignmentmentioning

confidence: 99%

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Joint resource allocation and base-station assignment for the downlink in CDMA networks

Lee

Mazumdar

Shroff

2006

IEEE/ACM Trans. Networking

120

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“…Mobile wireless data rates will improve dramatically with the introduction of 3G networks and services. 11,12 It is expected that the number of mobile Internet terminals will exceed the number of PCs in the next two years. Mobile wireless access for laptops is already available in many US cities through Metricom's Ricochet service.…”

Section: Wirelessmentioning

confidence: 99%

Broadband networks

Rath¹

2000

IEEE Multimedia

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“…Transmission formats that allow for multi-slot packet transmission increase the number of effective transmission rates, and allow for better adaptation to the channel conditions through earlier termination of re-transmissions, at the cost of increased packet delay. Synchronous [25] and asynchronous [26,27] packet re-transmission methods have been proposed. In this paper, we examine the performance of synchronous and asynchronous re-transmission schemes designed to increase throughput of the SS-OFDM-F/TA system, while maintaining acceptable packet delays.…”

Section: Introductionmentioning

confidence: 99%

Efficient packet data service in a spread spectrum OFDM cellular system with 2‐dimensional radio resource allocation

Novak¹,

Krzymien²

2004

Trans Emerging Tel Tech

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SUMMARYThis paper describes and evaluates a novel 2-dimensional radio resource allocation scheme for highthroughput cellular packet data access. The proposed system employs spread spectrum orthogonal frequency division multiplexing with adaptive time and frequency allocation (SS-OFDM-F/TA) of radio resources. In order to achieve high spectral efficiency of downlink packet transmissions to multiple mobile users, multi-user diversity available in the multi path fading environment is exploited through the use of adaptive modulation and coding, best serving sector selection, suitable scheduling of packet transmissions and hybrid ARQ employing soft-packet combining and incremental redundancy. The data throughput, packet delay and fairness of the system with slow and fast best sector selection are examined. A method of grouping disjoint sub-bands for use in highly frequency-selective environments is described and evaluated. Packet re-transmission options including a proposal of several asynchronous re-transmission algorithms and constraining the maximum re-transmission interval are also considered. It is demonstrated that the proposed spread spectrum OFDM system is capable of reaching a spectral efficiency of about 1.7 b/sec/Hz/ sector with single receive and transmit antennas, and seems to provide a promising solution for highthroughput best-effort delay-tolerant data services in future cellular radio systems.

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Developments in third generation (3G) CDMA technology

Cited by 13 publications

References 1 publication

Joint resource allocation and base-station assignment for the downlink in CDMA networks

Joint resource allocation and base-station assignment for the downlink in CDMA networks

Broadband networks

Efficient packet data service in a spread spectrum OFDM cellular system with 2‐dimensional radio resource allocation

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