Receive antenna relative phase measurements for NR
An approach is described to for new radio (NR) antenna test function (ATF) measurements by a user equipment (UE). The approach includes measuring a first average phase of receive signals on resource elements that carry secondary synchronization signals (SS) received by a reference individual receiver branch. The approach also includes measuring a second average phase of the receive signals on the resource elements that carry secondary synchronization signals received by one other individual receiver branch different from the reference individual receiver branch. The approach further includes determining a difference between the first average phase and the second average phase. An indication of the difference is reported to test equipment.
1. A method for antenna test function (ATF) measurements by a user equipment (UE), comprising:
receiving first signals on resource elements that carry secondary synchronization signals (SS) received by a reference individual receiver branch;
receiving second signals on resource elements that carry secondary synchronization signals received by one other individual receiver branch different from the reference individual receiver branch;
determining a difference between a first phase of the first signals and a second phase of the second signals, the determining including computing an argument of a cross-correlation between the first signals and the second signals, wherein the cross-correlation includes taking a conjugate of either the first signals or the second signals; and
reporting an indication of the difference to a test equipment.
2. The method of claim 1 , wherein the first signals and the second signals are received signals corresponding to secondary SS/physical broadcast channel (PBCH) blocks with a same SS/PBCH block index and a same physical-layer cell identity.
3. The method of claim 1 , wherein the first signals and the second signals are received signals on resource elements that carry physical broadcast channel (PBCH) demodulation reference signals (DMRS).
4. The method of claim 1 , wherein the first signals and the second signals are received signals on the resource elements that carry channel state information (CSI) signals.
5. The method of claim 1 , wherein the receiving the first signals and the receiving the second signals occurs in a Radio Resource Control (RRC) connected mode.
6. The method of claim 1 , wherein the receiving the first signals and the receiving the second signals occurs in a test loop mode.
7. The method of claim 1 , wherein the receiving the first signals and the receiving the second signals occurs during a regular operation of the UE.
8. A user equipment comprising:
processor circuitry configured to:
receive first signals on resource elements that carry secondary synchronization signals (SS) received by a reference individual receiver branch;
receive second signals on resource elements that carry secondary synchronization signals received by one other individual receiver branch different from the reference individual receiver branch;
determine a difference between a first phase of the first signals and a second phase of the second signals, the determination including computing an argument of a cross-correlation between the first signals and the second signals, wherein the cross-correlation includes taking a conjugate of either the first signals or the second signals; and
causing a reporting of an indication of the difference to a test equipment.
9. The UE of claim 8 , wherein the first signals and the second signals are received signals corresponding to secondary SS/physical broadcast channel (PBCH) blocks with a same SS/PBCH block index and a same physical-layer cell identity.
10. The UE of claim 8 , wherein the first signals and the second signals are received signals on resource elements that carry physical broadcast channel (PBCH) demodulation reference signals (DMRS).
11. The UE of claim 8 , wherein the first signals and the second signals are received signals on the resource elements that carry channel state information (CSI) signals.
12. The UE of claim 8 , wherein the first signals and the second signals are received in a Radio Resource Control (RRC) connected mode.
13. The UE of claim 8 , wherein the first signals and the second signals are received in a test loop mode.
14. The UE of claim 8 , wherein the first signals and the second signals are received during a regular operation of the UE.
15. A non-transitory computer-readable media (CRM) comprising instructions for an electronic device, wherein upon execution of the instructions by one or more processors of the electronic device causes the one or more processors to:
receive first signals on resource elements that carry secondary synchronization signals (SS) received by a reference individual receiver branch;
receive second signals on resource elements that carry secondary synchronization signals received by one other individual receiver branch different from the reference individual receiver branch;
determine a difference between a first phase of the first signals and a second phase of the second signals, the determination including computing an argument of a cross-correlation between the first signals and the second signals, wherein the cross-correlation includes taking a conjugate of either the first signals or the second signals; and
causing a reporting of an indication of the difference to a test equipment.
16. The non-transitory CRM of claim 15 , wherein the first signals and the second signals are received signals corresponding to secondary SS/physical broadcast channel (PBCH) blocks with a same SS/PBCH block index and a same physical-layer cell identity.
17. The non-transitory CRM of claim 15 , wherein the first signals and the second signals are received on resource elements that carry physical broadcast channel (PBCH) demodulation reference signals (DMRS).
18. The non-transitory CRM of claim 15 , wherein the first signals and the second signals are received on the resource elements that carry channel state information (CSI) signals.
19. The non-transitory CRM of claim 15 , wherein the first signals and the second signals are received in a Radio Resource Control (RRC) mode.
20. The non-transitory CRM of claim 15 , wherein the first signals and the second signals are received in a test loop mode.