Voice fallback target district selection method and device and terminal

Abstract

The invention discloses a voice falling object district selection method and device and a terminal, relating to the communication technology field. The voice fallback object district selection method comprises steps of obtaining signal intensity of all terminal voice fallback target districts to be searched according to a redirection order on a network side, determining target districts of a first preset quantity from all target districts according to the target district signal intensity, obtaining a signal interference value of the target districts of the first preset quantity, and determining target districts of a second preset quantity as a final target district for terminal voice fallback from the target districts of the first preset quantity according to a target district signal interference channel. The voice fallback object district selection method and device and terminal determine the target district through performing double threshold screening on the district performance, improve a terminal calling success rate, guarantee voice quality of terminal and improve user experience.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, device and terminal for selecting a voice fallback target cell. Background technique [0002] LTE (Long Term Evolution, Long Term Evolution), as a follow-up evolution technology of 3G, is recognized by the industry as the evolution direction of the next generation of mobile communications due to its unique technical advantages such as high data rate, low latency, and flexible bandwidth configuration. Focusing on voice services in the LTE era, the industry has proposed a variety of solutions for commercial use, such as dual standby SVLTE (simultaneous voice and LTE, LTE and voice network synchronous support) solution, CSFB (Circuit Switched Fallback, circuit domain fallback) solution And VoLTE (Voice over LTE, Voice over LTE) solution. Among them, CSFB refers to the technology that a terminal residing in the LTE network leaves the LTE network and returns ...

AI Technical Summary

Problems solved by technology

[0008] However, the current GSM network has undergone more than a dozen rounds of expansion, with a large scale and numerous frequency points. In addition, improper frequency reuse and incorrect frequency point setting during frequency planning have resulted in the distance between two co-frequency cells failing to meet the standard value. , resulting in same-frequency / adjacent-frequency interference within a short distance

Since the RSSI measurement value is the sum of the power of all signals (including pilot signals and data signals, adjacent cell interference signals, noise signals, etc.), it may happen that some adjacent or co-frequency coverage areas have good RSSI but poor SINR (interference caused by a larger value), the terminal cannot normally reside in this cell

Therefore, when the CSFB terminal voice falls back, it is judged only based on the RSSI measurement value. It is not accurate enough to select the GSM cell with the strongest RSSI. If a GSM cell with good RSSI but poor SINR is selected, the fallback may fail because the GSM cell cannot reside, or The fallback is successful, but the GSM voice quality is poor due to the large interference of the same channel / adjacent channel

Images