Method and device for scrambling positioning reference signals

Abstract

The embodiment of the invention discloses a method and a device for scrambling positioning reference signals and belongs to the field of communication. The method comprises the following steps of: acquiring a time slot serial number ns, an orthogonal frequency division multiplexing (OFDM) symbol serial number l, a cell identity NIDcell, a cyclic prefix (CP) length identity network control protocol (NCP); acquiring frequency shift information vshift of the positioning reference signals (PRSs); acquiring a scrambling sequence according to the acquired ns, l, NIDcell, NCP and vshift; and scrambling the PRSs according to the scrambling sequence. The device comprises an information acquisition module, a scrambling sequence acquisition module and a scrambling module. In the technical scheme provided by the embodiment of the invention, the scrambling sequence of the generated PRSs has higher randomness by using the frequency shift information as an element of the scrambling sequence, the mutual interference among the PRSs received by user equipment (UE) at the same time is reduced, and the positioning precision of the UE is improved. A register of a Gold sequence is fully used, and the waste of resources is reduced.

Description

technical field [0001] The present invention relates to the field of communications, and in particular, to a method and device for scrambling a positioning reference signal. Background technique [0002] With the development of communication technology, the application of mobile terminal positioning technology in the LTE (Long Term Evolmion, Long Term Evolution) system is more and more extensive, for example, emergency call service, specific tracking service, and the like. The mobile terminal positioning technology is a technology for accurately measuring the geographic location of the mobile terminal at a certain time. By carrying the PRS (Positioning Reference Signal, positioning reference signal) in the subframe sent by the base station to the UE (UserEquipment, user equipment) ) to realize the positioning of the mobile terminal (wherein, the subframe carrying the PRS is called a positioning subframe). In order to accurately locate the UE, the UE needs to detect the PRS ...

AI Technical Summary

Problems solved by technology

[0007] c obtained by formula (1) init ≤2 28 -1, which is c init The range is 0~(2 28 -1), so it can be seen that the CRS scrambling formula (1) obtains a limited range of initialization values ​​for the second m-sequence that generates the Gold sequence, so the initialization value of the generated Gold sequence is also limited, which in turn makes the randomness of the PRS Therefore, the collision probability of PRSs from different cells is still relatively high when they arrive at the UE, and the mutual interference between PRSs is still relatively serious, which affects the accuracy of positioning; and, from c init ≤2 28 It can be seen from -1 that only 28 registers of the Gold sequence are used for scrambling using the CRS scrambling formula, and the waste of resources is serious

Images