A handover method in CDMA system

Abstract

A handover method in CDMA system, which contains 1, RNC receiving the cache shared UE upload measurement report of cofrequency cell, 2, judging whether activation non cofrequency is needed, if it is then followed by step 3, otherwise ending said process, 3, RNC constructing non cofrequency switching reference group according to UE state and cache cofrequency measurement report, 4, RNC generating non cofrequency candidate cell group according to the intersection of near cell in centralized cell, 5, selecting high priority non cofrequency candidate cell as destination cell to activate non cofrequency switching.

Description

technical field [0001] The invention relates to the handover field in wireless mobile communication technology, in particular to a handover method in a code division multiple access system. Background technique [0002] In the cellular mobile communication system, in order to improve the utilization rate of spectrum resources and the capacity of the whole system, the radio frequency power in the system must be limited within a certain range. When a mobile station (UE) leaves a cell and enters another cell, the signal it receives from the original cell must become weaker and weaker, while the signal it receives from the cell it is entering will become stronger and stronger. In order to ensure the communication quality of the UE, the UE must be handed over from the original base station to a new base station with a stronger signal, that is, handover from the source cell to the target cell. According to the properties of the source cell and the target cell, the handover in the...

AI Technical Summary

Problems solved by technology

Since the transmission slots of the compressed mode do not support fast power control and part of the interleaving gain is lost, a higher signal-to-noise ratio is required during compressed frames, which results in a reduction in system capacity

In addition, the data that should be transmitted in one frame can only be transmitted after being compressed when the compression mode is activated, resulting in increased power and interference to other users, thereby affecting the performance of base stations or mobile devices

[0009] 2. Since the single-mode mobile terminal needs to start the compression mode and measure the target frequency, the response time of the non-same-frequency handover is relatively long, and it is easy to cause call drop when the quality of the current active set drops rapidly; The UE with dual receivers also needs to measure non-same-frequency signals, which increases the switching time, and the cost of the UE will be relatively high

[0010] 3. Due to the limitation of the method of measuring the target frequency in the prior art, the target cell constructed each time can only be one of different frequencies or different systems, so it is generally not possible to start the different frequencies and different systems in non-same-frequency handover at the same time Handover, when the handover between different frequencies or different systems fails, and the system wants to re-initiate the handover, it must perform various signal measurements again, so it is difficult to initiate another handover in a short time