Soft handover is one of the key technologies of the WCDMA system, and it is also the focus of wireless resource management and optimization. The setting of the soft handover algorithm and related parameters directly affects the system capacity and service quality. This paper studies the soft handover technology in the WCDMA system. First, the basic process of the soft handover algorithm is introduced, and then the traditional UTAR soft handover algorithm is theoretically introduced and simulated, and the average active set number (MASN) and active set update are used. The three performance indicators of ASUR and OP are used to analyze the performance of the algorithm. Finally, based on the shortcomings of the current algorithm, an improved soft handover algorithm is proposed. Through simulation verification, the improved algorithm is in the average active set number (MASN), active set update rate (ASUR) and call interruption probability (OP) Both are better than traditional soft handover algorithms. Finally, the impact of the improved soft handover algorithm on the uplink and downlink performance is analyzed.
With the development of modern communication, the third-generation mobile communication system can not only provide greater system capacity and better communication quality than the second-generation mobile communication system, but also better realize seamless roaming on a global scale And to provide users with voice data and mobile multimedia services. At present, the global mobile communication system is in the transitional stage from the second generation to the third generation. The research of the third-generation mobile communication system has become a hot spot in the field of mobile communication [1].
With social progress and technological development, traditional fixed-line communication business capabilities have been difficult to meet people's growing material and cultural needs. The mobile communication network just satisfies people's requirements for communicating with fixed terminals or other mobile carriers in social activities, and it has also become one of the most personalized communication methods in today's society. Among them, the 3G communication technology led by the WCDMA system has pushed this communication boom to its peak.
Compared with the second-generation mobile communication system, WCOMA has applied many key technologies, such as wireless resource management, RAKE reception, multi-user detection, smart antennas and power control [2].