Same-frequency switching method and device for endangered electric quantity terminal

Abstract

The invention discloses a same-frequency switching method and device for an endangered electric quantity terminal, and the method is applied to a base station, and comprises the steps: receiving an endangered electric quantity alarm signal reported by a terminal; according to a measurement report reported by the terminal, judging whether the uplink signal-to-noise ratio of the terminal is not less than a signal-to-noise ratio threshold value and whether the moving speed of the terminal is not greater than a speed threshold value; if yes, amplifying the current same-frequency switching hysteresis value to obtain a same-frequency switching hysteresis value of the endangered electric quantity mode; based on the same-frequency switching hysteresis value of the endangered electric quantity mode, issuing a measurement control instruction to the terminal, so that the terminal detects whether a first event A3 is triggered or not according to the same-frequency switching hysteresis value of the endangered electric quantity mode; and receiving a first event A3 reported by the terminal, and completing cell switching processing of the terminal according to the first event A3. According to the mode, the common-frequency switching algorithm of the endangered electric quantity mode is obtained by modifying the normal common-frequency switching algorithm, and the residence time of the endangered electric quantity terminal in the service cell can be prolonged.

Description

technical field [0001] The present invention relates to the technical field of LTE wireless network, in particular to a method and device for same-frequency handover of endangered power terminals. Background technique [0002] At present, the same-frequency handover algorithm in LTE system design only has coverage-based handover. The coverage-based intra-frequency handover target cell decision depends on the reporting of event A3, and the target cell is obtained from event A3. [0003] figure 2 A schematic diagram showing trigger conditions and cancellation conditions of event A3 in the prior art. like figure 2 As shown, the trigger condition is: Mn+Ofn+Ocn-Hys>Ms+Ofs+Ocs+Off (Formula 1), and the above condition lasts for TimeToTrig time. The cancellation condition is: Mn+Ofn+Ocn+Hys<Ms+Ofs+Ocs+Off (Formula 2), and the above condition lasts for TimeToTrig time. [0004] The meanings of the variables in the above formula are as follows: Ms and Mn represent the measure...

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Problems solved by technology

[0005] However, the inventor found in the process of implementing the present invention that the method of performing same-frequency handover based on the reported event A3 has the following defects: (1) TimeToTrig and Hys control the difficulty of handover, and if the setting is too large, it will easily lead to delayed handover and call drop ; On the contrary, it will easily cause ping-pong switching

(2) The handover decision is based only on the RSRP and RSRQ values ​​of the serving cell and neighboring cells, and there may be cases where the signal-to-noise ratio is worse and the throughput is lower after switching to the target cell

(3) Handover will inevitably lead to interruption of data transmission. According to the protocol, there will be a user plane interruption of 12ms under ideal conditions

The resulting data transmission interruption and delay have a negligible impact on terminals under normal power conditions, but since terminals under endangered power levels hope to complete the current business as soon as possible, it is necessary to avoid unnecessary switching. Delay and user plane interruption, so the existing technology is not suitable for terminals that can only maintain short-term communication under endangered power

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