Beam management procedures
Wireless communications are described. A wireless device and/or a base station may determine/select one or more beams for transmission of signals (e.g., sounding reference signals, SRSs) in one or more cells. The wireless device and/or the base station may determine/select a beam based on one or more of: cell indicators of a first cell and/or a second cell, antenna panel indicators associated with SRS transmissions, prorities of SRS transmissions, resource set indicators corresponding to the SRS transmissions, and/or other information.
1. A method comprising:
selecting, by a wireless device, a spatial transmission filter from a first spatial transmission filter of a first sounding reference signal (SRS) resource of a first cell and a second spatial transmission filter of a second SRS resource of the first cell, wherein the selecting is based on:
the first SRS resource of the first cell and the second SRS resource of the first cell overlapping with a third SRS resource of a second cell; and
the first spatial transmission filter of the first SRS resource and the second spatial transmission filter of the second SRS resource being different from a third spatial transmission filter of the third SRS resource; and
transmitting, by the wireless device via the selected spatial transmission filter, an SRS for the third SRS resource.
2. The method of claim 1 , wherein the transmitting the SRS via the selected spatial transmission filter is for estimating a channel associated with the third SRS resource that overlaps with the first SRS resource and the second SRS resource.
3. The method of claim 1 , wherein the first SRS resource, the second SRS resource, and the third SRS resource overlap in a time duration, wherein the time duration comprises at least one of:
a symbol;
a slot;
a transmission time interval;
a subframe; or
a frame.
4. The method of claim 1 , wherein the selecting the spatial transmission filter is further based on at least one of:
a first cell index of the first cell being less than a second cell index of the second cell; or
the first cell index of the first cell being greater than the second cell index of the second cell.
5. The method of claim 1 , wherein the selecting the spatial transmission filter is further based on a first SRS resource set index of a first SRS resource set comprising the first SRS resource and a second SRS resource set index of a second SRS resource set comprising the second SRS resource.
6. The method of claim 1 , wherein the selecting the spatial transmission filter is further based on at least one of a first SRS resource type of the first SRS resource or a second SRS resource type of the second SRS resource having a higher priority than a third SRS resource type of the third SRS resource.
7. The method of claim 1 , wherein:
the first SRS resource is associated with a first antenna panel, wherein the first antenna panel is indicated by a first antenna panel index;
the second SRS resource is associated with a second antenna panel, wherein the second antenna panel is indicated by a second antenna panel index; and
the transmitting the SRS for the third SRS resource via the selected spatial transmission filter is based on the first antenna panel index and the second antenna panel index.
8. A method comprising:
receiving, by a wireless device, one or more configuration parameters of a first cell and a second cell;
selecting, by the wireless device, one of a first spatial transmission filter of a first sounding reference signal (SRS) transmission for a first SRS resource of the first cell or a second spatial transmission filter of a second SRS transmission for a second SRS resource of the first cell, wherein the selecting is based on:
the first SRS transmission for the first SRS resource of the first cell and the second SRS transmission for the second SRS resource of the first cell overlapping with a third SRS transmission for a third SRS resource of the second cell; and
the first spatial transmission filter of the first SRS transmission and the second spatial transmission filter of the second SRS transmission being different from a third spatial transmission filter of the third SRS transmission; and
transmitting, by the wireless device via the selected one of the first spatial transmission filter or the second spatial transmission filter, the third SRS transmission.
9. The method of claim 8 , wherein the one or more configuration parameters comprise at least one of:
a first index of the first cell and a second index of the second cell; or
a first SRS spatial relation associated with the first SRS transmission, a second SRS spatial relation associated with the second SRS transmission, and a third SRS spatial relation associated with a third SRS transmission.
10. The method of claim 8 , wherein the transmitting the third SRS transmission is based on at least one of the first SRS transmission and the second SRS transmission having a higher priority than the third SRS transmission.
11. The method of claim 8 , wherein the transmitting the third SRS transmission is based on a first SRS resource set index associated with the first SRS resource and a second SRS resource set index associated with the second SRS resource.
12. The method of claim 8 , wherein:
the first SRS transmission is associated with a first antenna panel, wherein the first antenna panel is indicated by a first antenna panel index;
the second SRS transmission is associated with a second antenna panel, wherein the second antenna panel is indicated by a second antenna panel index; and
the transmitting the third SRS transmission is based on the first antenna panel index and the second antenna panel index.
13. The method of claim 8 , further comprising dropping a fourth SRS transmission of the second cell, based on:
determining, by the wireless device, that a fifth SRS transmission of the first cell and a sixth SRS transmission of the first cell overlap with the fourth SRS transmission of the second cell; and
determining, by the wireless device, that a fifth spatial transmission filter of the fifth SRS transmission and a sixth spatial transmission filter of the sixth SRS transmission are different from a fourth spatial transmission filter of the fourth SRS transmission.
14. The method of claim 8 , wherein the first spatial transmission filter and the second spatial transmission filter are different.
15. A method comprising:
transmitting, by a wireless device via a first spatial transmission filter of a first sounding reference signal (SRS) resource of a first cell, a first SRS;
transmitting, by the wireless device via a second spatial transmission filter of a second SRS resource of the first cell, a second SRS; and
transmitting a third SRS, wherein the transmitting is by the wireless device, via one of the first spatial transmission filter or the second spatial transmission filter, and based on:
the first SRS resource and the second SRS resource overlapping with a third SRS resource of a second cell, and
the first spatial transmission filter and the second spatial transmission filter being different from a third spatial transmission filter of the third SRS resource of the second cell.
16. The method of claim 15 , wherein the transmitting the third SRS is further based on at least one of the first SRS and the second SRS having a higher priority than the third SRS.
17. The method of claim 15 , wherein the transmitting the third SRS is further based on a first SRS resource set index of a first SRS resource set comprising the first SRS resource and a second SRS resource set index of a second SRS resource set comprising the second SRS resource.
18. The method of claim 15 , wherein:
the first SRS resource is associated with a first antenna panel, wherein the first antenna panel is indicated by a first antenna panel index;
the second SRS resource is associated with a second antenna panel, wherein the second antenna panel is indicated by a second antenna panel index; and
the transmitting the third SRS is based on the first antenna panel index and the second antenna panel index.
19. The method of claim 15 , further comprising dropping a transmission of a fourth SRS for a fourth SRS resource of the second cell, based on:
determining, by the wireless device, that a fifth SRS resource of the first cell and a sixth SRS resource of the first cell overlap with the fourth SRS resource of the second cell; and
determining, by the wireless device, that a fifth spatial transmission filter of the fifth SRS resource and a sixth spatial transmission filter of the sixth SRS resource are different from a fourth spatial transmission filter of the fourth SRS resource.
20. The method of claim 15 , wherein the first spatial transmission filter and the second spatial transmission filter are different.