A LTE-HI small cell discovery method based on macro base station reference signal toa estimation

Abstract

The invention relates to an LTE-Hi small cell discovery method based on macro base station reference signal TOA estimation and belongs to the technical field of mobile communication. According to the method, regional processing is carried out on geographic regions in a coverage range of small cells in a network; adjacent region of each small cell is divided into a plurality of partial regions; and the partial regions are not overlapped. UE (User Equipment) carries out TOA estimation and related processing by taking Ts as a cycle, a final target is finding a fingerprint corresponding to certain partial region in a TOA fingerprint database, and the UE is triggered by the fingerprint to carry out IFS (inter-frequency scanning) small cell discovery operation. According to the scheme, the IFS different-frequency detection region of the UE is controlled in a small range; when the UE is located out of the range or passes through the region rapidly, the TOA fingerprint cannot generate matching to excite an IFS action for triggering the UE, so the invalid IFS different-frequency detection times of the UE is greatly reduced and avoided, and the energy consumption efficiency problem of the UE when the small cell discovery is carried out is solved well.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to an LTE-Hi small cell discovery method based on macro base station reference signal TOA estimation. Background technique [0002] In recent years, wireless data traffic has grown rapidly, and most of them occur indoors and in hot spots. However, the current mobile communication system mainly provides services for macro coverage scenarios, and cannot well meet the needs of users in indoor and hotspot areas. In response to the further demand for hotspots and indoor coverage, 3GPP proposed a small cell enhancement (SCE) solution in Release-12. In particular, the small cell indoor scene and hotspot scene are the same as the current industry hot research technology LTE -Hi is closely related in terms of design scenarios, technical solutions, and performance goals. Both of them directly focus on the scenarios and goals of service coverage in hotspot areas and indoor areas. ...

AI Technical Summary

Problems solved by technology

[0005] The main problems faced by the LTE-Hi small cell discovery technology are: (1) When the UE performs IFS-based small cell discovery, the energy (or power) it consumes will increase due to the increase in the number of measured carriers

IFS in this case tends to waste a lot of energy in the UE

In addition, if the UE is outside the coverage area of ​​the LTE-Hi small cell, repeated IFS operations at this time are even more useless, and the power consumption of the UE is wasted in vain.

(3) During the process of performing IFS, the UE may also be affected by severe interference between the discovery signal and the reference signal transmitted by multiple small cell base stations in the cell cluster

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