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Research on Rate Control Algorithm for the Reverse Link in Cdma2000 1x EV-DO Systems

Author: GuLiPeng
Tutor: ChaiYuanBo
School: PLA Information Engineering University
Course: Communication and Information System
Keywords: 1x EV - DO Rate control Thermal noise increment T2P mechanism Closed-loop control Probability adaptive Channel quality
CLC: TN929.533
Type: Master's thesis
Year: 2010
Downloads: 20
Quote: 1
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Abstract


Technology-driven demand for traction, market-oriented is the main driving force to promote the development of new technologies. CDMA2000 is one of the three major 3G mainstream technology, CDMA2000 1x EV-DO high-speed data transfer capabilities mainly to complete the cdma2000 1x system. Rate control technology is a key technology in the CDMA2000 1x EV-DO, which can greatly improve system stability and system capacity to meet the service needs of the user data services. 1x EV-DO technology has begun to enter the stage of commercial application, the reverse link rate control algorithm research primarily in the following three questions: (1) lack of good applicability of theoretical analysis method guidance, the new algorithm design is difficult; (2) algorithm is not high enough flexibility to adapt to the lack of load changes; (3) channel resource allocation unreasonable, affect the efficiency of the system. In this paper, 1x EV-DO reverse link rate control algorithm for the presence of these three issues expand specialized research. In-depth analysis of rate control mechanisms and existing algorithms based on the establishment of a better suitability analysis model reverse link rate closed-loop control model; under the framework of the model proposed two rate control improved algorithm. Of this specific work as follows: 1, the use of discrete-time control theory to design the base station side and terminal side rate control module built into the closed-loop control model, the model can effectively analyze the rate control mechanism, guide the design rate control strategy. Using root locus design method is obtained to ensure system stability corresponding to the open-loop pulse transfer function gain reasonable range of control module configured with different weighting factor for system stability and speed of response verification rate of the terminal side, select the best rate control strategy, to provide efficient and flexible analytical model for rate control algorithm design analysis and verification. 2, the traditional rate control algorithm rate transition probability set high flexibility, a probabilistic adaptive rate control algorithm. The algorithm introduces a sliding window mechanism through statistical reverse the activation bit value changes, the flexibility to change the rate of transition probabilities, in order to more accurately adapt to changes in system load. The simulation results show that the algorithm than the conventional algorithm significantly improve the system throughput and performance of the probability of overload, to achieve a good compromise between. 3, for the the T2P mechanism rate control algorithm for channel resource allocation is unreasonable, the problem of low efficiency of the system, the reverse link rate control algorithm based on channel quality. The algorithm will activate the terminal according to the division level of the pilot power and the introduction of weighting factors assigned flexibly adjusted T2P stream preferably terminal such that the reverse channel quality better data transmission space, while avoiding the reverse channel quality is poor terminal increase the transmission power and the system can generate a strong interference. Simulation results show that the proposed new algorithm has higher throughput than existing algorithms, lower terminal transmission power and a smaller load on the system.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Code Division Multiple Access (CDMA) mobile communication
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