Method, system, and device for transmitting preamble signal and for signal measurement
A method, system, and device for transmitting a preamble signal and for signal measurement, for use in solving the problem found in the prior art that the transmission power of each antenna unit is greatly reduced as a result that each antenna unit transmits one preamble signal and that the complexity of a user equipment is increased when the antenna units are of a great number. The method of embodiments of the present disclosure comprises: a network side device transmits to the user equipment determined CSI feedback configurations, where one CSI feedback configuration corresponds to one CSI-RS resource, and the preamble signal corresponding to each port of the one CSI-RS resource is transmitted via one set of antenna unit corresponding to the port. Employment of the solution of the embodiments of the present disclosure increases the transmission power of the antenna units, allows the user equipment to correctly perform signal measurement, increases the performance of data transmission, and reduces the complexity of the user equipment when the antenna units are of a great number.
1. A method for transmitting a pilot signal, the method comprising:
determining, by a network side device, at least one Channel State Information, CSI, feedback configuration to be transmitted to a user equipment, wherein one CSI feedback configuration corresponds to one Channel State Information-Reference Signal, CSI-RS, resource, and for each port of one CSI-RS resource, a pilot signal corresponding to the port is transmitted over one group of antenna elements corresponding to the port; and
transmitting, by the network side device, the determined at least one CSI feedback configuration to the user equipment to instruct the user equipment to receive a pilot signal over a CSI-RS resource corresponding to the determined at least one CSI feedback configuration and to make signal measurement according to the received pilot signal;
wherein determining, by the network side device, the at least one CSI feedback configuration to be transmitted to the user equipment comprises:
determining, by the network side device, a measurement parameter of the user equipment for a pilot signal of at least one first CSI-RS resource;
selecting, by the network side device, a part or all of the at least one first CSI-RS resource according to the determined measurement parameter;
determining, by the network side device, at least one second CSI-RS resource corresponding to the selected part or all of the at least one first CSI-RS resource; and
determining, by the network side device, a second CSI feedback configuration as the CSI feedback configuration to be transmitted to the user equipment, wherein a CSI-RS resource corresponding to the second CSI feedback configuration is the determined at least one second CSI-RS resource.
2. The method of claim 1 , wherein the intra-group beam-forming weight vector of the at least one first CSI-RS resource is the same as an intra-group beam-forming weight vector of the corresponding at least one second CSI-RS resource.
3. The method of claim 1 , wherein selecting, by the network side device, a part or all of the at least one first CSI-RS resource comprises:
determining, by the network side device, the at least one first CSI-RS resource corresponding to the first X highest measurement parameters or determining the at least one first CSI-RS resource corresponding to X measurement parameters greater than a threshold, wherein X represents a positive integer.
4. The method of claim 1 , wherein before determining, by the network side device, the measurement parameter of the user equipment for the pilot signal of the at least one first CSI-RS resource, the method further comprises:
configuring, by the network side device, the user equipment with a first CSI feedback configuration corresponding to the at least one first CSI-RS resource to instruct the user equipment to receive a pilot signal over the at least one first CSI-RS resource corresponding to the first CSI feedback configuration and to make signal measurement according to the received pilot signal.
5. The method of claim 1 , wherein the method further comprises:
for one of the at least one first CSI-RS resource, transmitting, by the network side device, for each port of the at least one first CSI-RS resource, a pilot signal corresponding to the port over one group of antenna elements corresponding to the port of the at least one first CSI-RS resource.
6. The method of claim 5 , wherein transmitting, by the network side device, for each port of the at least one first CSI-RS resource, a pilot signal corresponding to the port over one group of antenna elements corresponding to the port of the at least one first CSI-RS resource comprises:
for one of the at least one first CSI-RS resource, determining, by the network side device, an intra-group beam-forming weight vector corresponding to the at least one first CSI-RS resource; and
for each port of the at least one first CSI-RS resource, weighting, by the network side device, the pilot signal corresponding to the port of the at least one first CSI-RS resource by the determined intra-group beam-forming weight vector and then transmitting the pilot signal over one group of antenna elements corresponding to the port.
7. The method of claim 1 , wherein the method further comprises:
for one of the at least one second CSI-RS resource, transmitting, by the network side device, for each port of the at least one second CSI-RS resource, a pilot signal corresponding to the port over one group of antenna elements corresponding to the port of the at least one second CSI-RS resource.
8. The method of claim 7 , wherein transmitting, by the network side device, the pilot signal corresponding to each port of the at least one second CSI-RS resource over one group of antenna elements corresponding to the port of the at least one second CSI-RS resource comprises:
for one of the at least one second CSI-RS resource, determining, by the network side device, an intra-group beam-forming weight vector corresponding to the at least one second CSI-RS resource; and
for each port of the at least one second CSI-RS resource, weighting, by the network side device, the pilot signal corresponding to the port of the at least one second CSI-RS resource by the determined intra-group beam-forming weight vector and then transmitting the pilot signal over one group of antenna elements corresponding to the port.
9. A method for signal measurement, comprising:
receiving, by a user equipment, at least one CSI feedback configuration transmitted by a network side device; wherein one CSI feedback configuration corresponds to one CSI-RS resource, and for each port of one CSI-RS resource, a pilot signal corresponding to the port is transmitted over one group of antenna elements corresponding to the port;
receiving, by the user equipment, a pilot signal over the CSI-RS resource corresponding to the at least one CSI feedback configuration and making signal measurement according to the received pilot signal;
wherein a CSI-RS resource corresponding to the at least one CSI feedback configuration is selected from all second CSI-RS resources corresponding to first CSI-RS resources; and
before receiving, by the user equipment, the at least one CSI feedback configuration transmitted by the network side device to the user equipment, the method further comprises:
receiving, by the user equipment, a first CSI feedback configuration configured by the network side device for the user equipment; and
receiving, by the user equipment, a pilot signal over a first CSI-RS resource corresponding to the first CSI feedback configuration and making signal measurement according to the received pilot signal.
10. The method of claim 9 , wherein making, by the user equipment, the signal measurement according to the received pilot signal comprises:
measuring, by the user equipment, Reference Signal Received Power, RSRP, according to the received pilot signal.
11. The method of claim 10 , wherein determining, by the user equipment, the RSRP comprises:
determining, by the user equipment, the RSRP of all or a part of the ports of the first CSI-RS resource corresponding to all or a part of the first CSI feedback configuration, and averaging the determined RSRP.