Uplink signal power control method and device

Abstract

The invention discloses an uplink signal power control method and device. Wherein, the method includes: configuring specific parameters for the user equipment; calculating the path loss of the uplink channel according to the specific parameters of the user equipment; performing uplink signal power control on the uplink channel according to the path loss of the uplink channel. Through the present invention, the path loss of the uplink channel can be accurately estimated, so as to ensure reasonable uplink transmission power of the user equipment (UE), ensure the transmission of the uplink signal of the UE, reduce the loss of the UE battery, and reduce the impact on other users the effect of interference.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a method and device for controlling uplink signal power. Background technique [0002] The uplink physical channels of the Long Term Evolution (LTE for short) system and the Long Term Evolution Advanced (LTE-A for short) system include: Physical Random Access Channel (Physical Random Access Channel, PRACH for short), Physical Uplink Shared Channel (Physical Uplink Shared Channel, PUSCH for short), Physical Uplink Control Channel (Physical Uplink Control Channel, PUCCH for short). The uplink of LTE adopts the single-carrier frequency division multiple access (Signal-Carrier Frequency Division Multiple Access, SC-FDMA for short) technology, and the reference signal and data are multiplexed together through time division multiplexing (Time Division Multiplex, TDM for short). The uplink reference signal is classified into a demodulation reference signal (Demodulation Reference Sig...

AI Technical Summary

Problems solved by technology

[0039] In a distributed multi-antenna system or a coordinated multi-point transmission (Coordinate multi-point transmission, referred to as CoMP) system, since the sending node and the receiving node of the uplink and downlink signals at the UE end may be inconsistent, when the sending node and the receiving node of the uplink and downlink signals at the UE end When the receiving node is inconsistent, it will lead to a large difference between the PL value estimated from the reference signal sent by the downlink sending node and the actual PL value between the uplink receiving node and the UE. Compensating the transmission power of the UE side signal on the road will cause inaccurate estimation of the UE signal transmission power, waste the UE transmission power, increase the battery consumption of the UE, affect the reception of the UE's uplink signal, and increase the load on users in adjacent cells. interference

[0040] Meanwhile, in a distributed multi-antenna system or a CoMP system deployed according to CoMP deployment scenario 4 in 3GPP standard 36.819 (Technical Specification Group Radio Access Network; Coordinated Multi-Point Operation for LTE), when the UE is in a low power node (Low Power Nodes (LPN for short) coverage, CRS is sent through the serving cell and LPN at the same time, at this time, the sending node and the receiving node of the UE's uplink and downlink signals are both LPNs, according to the uplink power control method in the Rel-10 LTE standard, When the UE calculates the path loss, it needs to use the reference Signal Power parameter broadcast by the serving cell, and this parameter is quite different from the CRS power actually received by the UE through the LPN. Therefore, the PL value calculated by the UE is different from the actual uplink PL value from the UE to the LPN. A large error will also cause inaccurate estimation of the signal transmission power at the UE, waste UE transmission power, increase UE battery consumption, and affect the reception of UE uplink signals and increase interference to users in adjacent cells

[0041] Therefore, when the UE in the distributed multi-antenna system or CoMP system uses different sending nodes and receiving nodes for uplink and downlink or is under the coverage of LPN, the existing methods for path loss estimation cannot reflect the actual uplink channel For the path loss situation, it is necessary to consider how to design the calculation method of the path loss, so that the measurement of the downlink reference signal can accurately reflect the path loss of the uplink channel, so as to reasonably control the transmit signal power of the UE and ensure the uplink signal of the UE. Transmission, reduce the loss of UE battery, and at the same time reduce the interference to other adjacent cell users

[0042] In the related art, when the UE in the distributed multi-antenna system or CoMP system uses different sending nodes and receiving nodes for uplink and downlink or is under the coverage of LPN, the existing methods for path loss estimation cannot reflect the actual uplink The problem of the path loss of the channel has not yet proposed an effective solution

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