Signal transmission method and apparatus
A signal transmission method and an apparatus. The method includes: a location management device receives first SRS resource configuration information from a serving cell and/or a neighboring cell. The location management device sends second SRS resource configuration information to a terminal device, where the second SRS resource configuration information includes third SRS resource configuration information and a downlink reference signal associated with an SRS resource indicated by the third SRS resource configuration information, and the third SRS resource configuration information is a part or all of the first SRS resource configuration information. The location management device configures the SRS resource for the terminal device, so that the SRS resource can be associated with the downlink reference signal. This helps the terminal device obtain information about a transmission beam for sending an SRS, and therefore SRS receiving efficiency of the cell can be improved to some extent.
1. A signal transmission method, comprising:
receiving, by a location management device, sounding reference signal (SRS) resource configuration information from a cell;
sending, by the location management device to a terminal device, a portion of the SRS resource configuration information received from the cell and a downlink reference signal that is of the cell and that is associated with an SRS resource indicated by the portion of the SRS resource configuration information received from the cell; and
requesting, by the location management device, the terminal device to report a difference between a reception time point and a transmission time point for the cell, wherein the reception time point is a downlink frame timing of the downlink reference signal associated with the SRS resource indicated by the portion of the SRS resource configuration information received from the cell, and the transmission time point is an uplink frame timing at which the terminal device sends an SRS.
2. The method according to claim 1 , wherein the downlink reference signal associated with the SRS resource indicated by the portion of the SRS resource configuration information received from the cell is a downlink positioning reference signal of the cell.
3. The method according to claim 1 , further comprising sending, by the location management device to the terminal device, an uplink timing advance (TA) of the cell.
4. The method according to claim 1 , further comprising sending, by the location management device to the terminal device, spatial relationship information of the SRS resource indicated by the portion of the SRS resource configuration information received from the cell.
5. The method according to claim 1 , further comprising:
sending, by the location management device, an SRS measurement request message to the cell, wherein the SRS measurement request message comprises the portion of the SRS resource configuration information received from the cell and a measurement type, and the measurement type comprises any one or more of the following: SRS reception time information, SRS reception angle information, or an SRS-based Rx-Tx time difference.
6. The method according to claim 5 , further comprising:
receiving, by the location management device, an SRS measurement result from the cell, wherein the SRS measurement result comprises one or more of: SRS reception time information, SRS reception angle information, or an SRS-based Rx-Tx time difference.
7. The method according to claim 1 , wherein the cell comprises a serving cell and a neighboring cell of the terminal device.
8. The method according to claim 1 , wherein the cell comprises a serving cell of the terminal device.
9. The method according to claim 1 , wherein the cell comprises a neighboring cell of the terminal device.
10. The method according to claim 1 , wherein the downlink reference signal associated with the SRS resource indicated by the portion of the SRS resource configuration information received from the cell is a synchronization signal/physical broadcast channel (SS/PBCH) block of the cell.
11. The method according to claim 1 , further comprising:
sending, by the location management device, an SRS measurement request message to the cell, wherein the SRS measurement request message comprises the portion of the SRS resource configuration information received from the cell and SRS reception time information.
12. The method according to claim 1 , further comprising:
sending, by the location management device, an SRS measurement request message to the cell, wherein the SRS measurement request message comprises the portion of the SRS resource configuration information received from the cell and SRS reception angle information.
13. The method according to claim 1 , further comprising:
sending, by the location management device, an SRS measurement request message to the cell, wherein the SRS measurement request message comprises the portion of the SRS resource configuration information received from the cell and an SRS-based Rx-Tx time difference.