| With the continuous development of mobile communications, trunking communication as aprofessional mobile communication technology has been applied more and more widely, especiallyfor some special groups or departments. The increase of trunking users'service demands will easilyresult in the system load under overload conditions and the instability of user communication,because of the limited timeslot, code channel, power and other resources of TD-SCDMA trunkingsystem. Based on the TD-SCDMA mobile communication system, applicative load controlstrategies considering the special characteristic of trunking business need to be researched fortrunking communication system.On the basis of the research of load control algorithm in TD-SCDMA mobile communicationsystem, load control strategy in TD-SCDMA trunking system is studied emphatically in this thesisfor trunking communication is sudden and may lead system overload easily. This thesis presents animproved interference prediction-based algorithm. The algorithm takes full account of the effects ofinterference between groups on the system performance. Based on the current system interferencelevel, the algorithm dynamically adjusts the interference threshold to control the load and processesthe overload timeslot by means of timeslot balancing combining with AMR deceleration to ensurethe quality of users'communication and give effective use of the system resource.In order to better evaluate the performance of the load control algorithm of TD-SCDMAtrunking system, this thesis adopts the dynamic system simulation method and builds a dynamicsimulation platform of TD-SCDMA trunking system that adequately simulate the characteristics ofreal trunking networks. The proposed load control algorithm is simulated through the platform andcompared with algorithms with different measures to deal with overload. The simulation resultsshow that the proposed load control algorithm can ensure system stability while improving systemperformance. |
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