A method and device for determining crs power

Abstract

The invention discloses a CRS power confirming method and equipment. The method includes conforming the CRS power of a corresponding cell; confirming a first PRB position for scheduling of a center user of the cell and a second PRB position for scheduling of an edge user of the cell; confirming that the CRS power of the first PRB position is obtained after the CRS power corresponding to the cell subtracts first preset power; confirming that CRS power of the second PRB position is obtained after the CRS power corresponding to the cell adds second preset power. The CRS power of different frequency domain positions is set separately, on the premise that emission performance of an RRU is not influenced, the emission power of information scheduling of the cell is guaranteed, coverage of the cell is improved, the power of a URS, the power of a PDCCH and the power of a PDSCH of beamforming users on the edge of the cell are improved, improvement of downlink signal quality of the beamforming users is benefited, frequency spectrum efficiency of the edge of the cell is improved, and meanwhile throughput capacity of a whole system is maintained.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a method and device for determining CRS power. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, the downlink adopts OFDM (Orthogonal Frequency Division Multiplexing) technology. In terms of resource division, there are PRB (Physical Resource Block, physical resource block), RE (ResourceElement resource unit) and OFDM symbols, etc. concept. Such as figure 1 As shown, it is a schematic diagram of downlink physical resources. Taking the most commonly used 20M LTE cell bandwidth as an example, a PRB is defined as 0.5ms in the time domain and 180KHz in the frequency domain. figure 1 It is marked by a thick line box in the middle; an RE is defined as 15KHz in the time domain (the interval of each OFDM symbol), and an OFDM symbol length in the frequency domain. figure 1 The area indicated by the middle arrow; the number of OFD...

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Problems solved by technology

[0012] According to the protocol, the four kinds of ρ B / ρ A ratio, such as Figure 5 As shown, for these four different ρ B / ρ A Schematic diagram of the RE power under the configuration, from Figure 5 It can be seen that only the RE power in the symbols containing CRSREs has changed. Although this scheme improves the coverage of the cell, for edge users, the MIMO (Multiple-InputMultiple-Output) method has already changed itself. Adapt to beamforming, and the demodulation of beamforming depends on the user-specific reference signal URS; through the comparison with the time-frequency position of CRS, it can be seen that whether it is port5 or port7 / port8 URS is located in OFDM symbols that do not contain CRS, And the above four ρ B / ρ A In the scenario, the RE power of the OFDM symbol where the URS is located has not been increased, so the existing RS transmit power increase scheme has no effect on the beamforming MIMO method, so it cannot improve the throughput of users who have switched to beamforming quantity

In addition, if the method of simply increasing the CRS power is adopted, assuming that the CRS is increased by 3db, and the beamforming URS and PDSCH are also increased by 3db, even if the PDCCH (PhysicalDownlinkControlChannel, physical downlink control channel) does not increase the power synchronously, there will be at least half of the bandwidth resources Unavailable, resulting in a great waste of system resources

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