Soft handoff in a CDMA wireless ATM environment

Lombardi, Silvia; Zhuang, Weihua

doi:10.1016/s0140-3664(99)00206-6

Cited by 1 publication

(3 citation statements)

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“…The residual delay is mapped to a requirement of minimal transmission rate R i;min ðnÞ [18]. Each handoff is associated with additional control signaling and possible buffered-data transfer for establishing a new connection [19] and for transmission of the user's information (such as the new base-station assignment) to the network database. We define h as a fixed cost per handoff, which is assumed the same for all services.…”

Section: System Model and Resource Managementmentioning

confidence: 99%

“…In general, the global solution of our LP algorithm provides a higher performance in terms of the sum of allocated rates P i r i À Á in kbps, except for the first result. The exception is mainly due to the approximation made in linearizing the problem in Lemma 1, as given in (19). The approximation may degrade the performance of the single-cell solution when the number of users in the cell is small, depending on the path gains and allocated powers of all the users.…”

Section: Comparison With Previous Workmentioning

confidence: 99%

“…In writing (23), the E b =I 0 constraint for the BER requirement is used. Equation (24) is derived using the approximation (19) for a large N and the assumption that is negligible as compared with the multiple access interference term. t u…”

Section: Appendixmentioning

confidence: 99%

See 2 more Smart Citations

Optimal resource management in wireless multimedia wideband CDMA systems

Soleimanipour

Zhuang

Freeman

2002

IEEE Trans. on Mobile Comput.

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This paper proposes a scheme of optimal resource management for reverse-link transmissions in multimedia wideband code-division multiple-access (WCDMA) communications. It is to guarantee quality-of-service (QoS) by resource (transmit power and rate) allocation and to achieve high spectral efficiency by base-station assignment. This approach takes the form of a nonlinearprogramming large-scale optimization problem: maximizing an abstraction for the profit of a service provider subject to QoS satisfaction. Solutions for both single-cell and multicell systems are investigated. The single-cell solution has the advantage of low complexity and global convergence in comparison with the previous work. Maximum achievable throughput (capacity) of a single cell is mathematically evaluated and used as the benchmark for performance measure of multicell systems. For multicell systems, due to its max-max structure, solving the optimization problem directly entails a high-computational complexity. Instead, the problem is reformulated to a mixed integer nonlinear-programming (MINLP) problem. Then, binary variables indicating base-station assignments are relaxed to their continuous analogs to make a computer solution feasible. Furthermore, approximations can be made to make the resource-management scheme less computationally complex and allow its partial decentralization. The sensitivity of the proposed scheme to path-gain estimation error is studied. Simulation results are presented to demonstrate the performance of the proposed scheme and the throughput improvement achieved by combining resource allocation with base station assignment.Index Terms-Wideband code-division multiple access (WCDMA), resource management, quality of service (QoS), base station assignment, multimedia services.

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Section: System Model and Resource Managementmentioning

confidence: 99%

Section: Comparison With Previous Workmentioning

confidence: 99%