Systems and methods for reliable dynamic indication for semi-persistent CSI-RS

Patent metadata

Field	Value
Publication number	US-11184787-B2
Application number	US-201815765784-A
Country	US
Kind code	B2
Filing date	Jan 8, 2018
Priority date	Jan 9, 2017
Publication date	Nov 23, 2021
Grant date	Nov 23, 2021

Abstract

According to certain embodiments, a method in a wireless device is provided that includes receiving, from a network node, dynamic allocation signaling to commence measurement on a semi-persistent CSI-RS resource. A first measurement is performed on the CSI-RS resource. A first CSI report based only on the first measurement is transmitted to the network node. A trigger message is received from the network node that is different from the dynamic allocation signaling. The trigger message triggers semi-persistent CSI reporting, and the wireless device initiates semi-persistent reporting.

First claim

The invention claimed is:

1. A method in a wireless device for initiating semi-persistent channel state information, CSI, measurements, the method comprising:
receiving, from a network node, dynamic allocation signaling, the dynamic allocation signaling triggering the wireless device to commence measurement on a semi-persistent channel state information-reference signal, CSI-RS, resource;
in response to receiving the dynamic allocation signaling, performing a first measurement on the semi-persistent CSI-RS resource;
receiving, from the network node, an aperiodic CSI report trigger message triggering an aperiodic CSI report, the aperiodic CSI report trigger message being different than the dynamic allocation signaling;
transmitting, to the network node, the aperiodic CSI report based only on the first measurement for which measurement was triggered on the semi-persistent CSI-RS resource by the dynamic allocation signaling;
receiving, from the network node, a semi-persistent CSI report trigger message that is different than the dynamic allocation signaling and the aperiodic CSI report trigger message, the semi-persistent CSI report trigger message triggering semi-persistent CSI reporting; and
initiating semi-persistent CSI reporting based on subsequent measurements of the semi-persistent CSI-RS resource.

2. The method according to claim 1 , wherein the dynamic allocation signaling comprises a MAC control element, MAC CE.

3. The method according to claim 1 , wherein the semi-persistent CSI report trigger message comprises downlink control information, DCI.

4. The method according to claim 1 , wherein initiating semi-persistent CSI reporting comprises transmitting a plurality of semi-persistent CSI reports.

5. The method according to claim 4 , further comprising:
ceasing transmission of the plurality of semi-persistent CSI-RS reports after a predetermined length of time.

6. The method according to claim 1 , where the first CSI report is an aperiodic report.

7. The method according to claim 1 , where the first CSI report is a semi-persistent report.

8. The method according to claim 1 , wherein the dynamic allocation signaling comprises at least one of the following:
an indication of semi-persistent CSI-RS measurement initiation;
an indication of semi-persistent CSI-RS resource configuration index/indices; and
an uplink resource allocation and associated modulation and coding rate.

9. The method according to claim 1 , wherein the semi-persistent CSI-RS resource comprises a CSI-RS resource that is configured with at least a CSI-RS transmission periodicity and for which at least one wireless device assumption on transmission and cessation of CSI-RS transmission applies.

10. The method according to claim 1 wherein:
the semi-persistent CSI-RS resource is configured for transmission of CSI-RS at a configured periodicity for a limited time duration; and
receipt of the dynamic allocation is required to trigger to transmission of the semi-persistent CSI-RS on the semi-persistent CSI-RS resource.

11. The method according to claim 1 , further comprising:
receiving dynamic deallocation signaling to terminate the measurement of on the semi-persistent CSI-RS resource; and
in response to the dynamic deallocation signaling, ceasing the semi-persistent measurements on the semi-persistent CSI-RS resource.

12. A wireless device for initiating semi-persistent channel state information, CSI, measurements, the wireless device comprising:
a memory storing instructions; and
processing circuitry operable to execute the instructions to cause the wireless device to:
in response to receiving the dynamic allocation signaling, receive, from a network node, dynamic allocation signaling, the dynamic allocation signaling triggering the wireless device to commence measurement on a semi-persistent channel state information-reference signal, CSI-RS, resource;
perform a first measurement on the semi-persistent CSI-RS resource;
receive, from the network node, an aperiodic CSI report trigger message triggering an aperiodic CSI report, the aperiodic CSI report trigger message being different than the dynamic allocation signaling;
transmit, to the network node, the aperiodic CSI report based only on the first measurement for which measurement was triggered on the semi-persistent CSI-RS resource by the dynamic allocation signaling;
receive, from the network node, a semi-persistent CSI report trigger message that is different than the dynamic allocation signaling and the aperiodic CSI report trigger message, the semi-persistent CSI report trigger message triggering semi-persistent CSI reporting; and
initiate semi-persistent CSI reporting based on subsequent measurements of the semi-persistent CSI-RS resource.

13. The wireless device according to claim 12 , wherein the dynamic allocation signaling comprises a MAC control element, MAC CE.

14. The wireless device according to claim 12 , wherein the semi-persistent CSI report trigger message comprises downlink control information, DCI.

15. The wireless device according to claim 12 , wherein initiating semi-persistent CSI reporting comprises transmitting a plurality of semi-persistent CSI reports.

16. The wireless device according to claim 15 , wherein the processing circuitry is operable to execute the instructions to cause the wireless device to:
cease transmission of the plurality of semi-persistent CSI-RS reports after a predetermined length of time.

17. A method in a network node for initiating semi-persistent channel state information, CSI, measurements, the method comprising:
transmitting, to the wireless device, dynamic allocation signaling, the dynamic allocation signaling triggering the wireless device to initiate measurement on a semi-persistent channel state information-reference signal, CSI-RS, resource for which the wireless device is not currently performing measurements;
transmitting, to the wireless device, an aperiodic CSI report trigger message triggering an aperiodic CSI report, the aperiodic CSI report trigger message being different than the dynamic allocation signaling;
receiving, from the wireless device, the aperiodic CSI report based only on a first measurement for which measurement was triggered on the semi-persistent CSI-RS resource by the dynamic allocation signaling; and
transmitting, to the wireless device, a semi-persistent CSI report trigger message that is different from the dynamic allocation signaling and the aperiodic CSI report trigger message, the semi-persistent CSI report trigger message triggering semi-persistent CSI reporting; and
receiving semi-persistent CSI reporting based on subsequent measurements of the semi-persistent CSI-RS resource by the wireless device.

18. The method according to claim 17 , wherein the dynamic allocation signaling comprises a MAC control element, MAC CE.

19. The method of claim 17 , further comprising:
based on receiving the aperiodic CSI report, determining that the wireless device successfully received the dynamic allocation signaling; and
wherein the semi-persistent CSI report trigger message is transmitted to the wireless device to trigger semi-persistent CSI reporting in response to determining that the wireless device successfully received the dynamic allocation signaling.

20. The method according to claim 17 , wherein the semi-persistent CSI report trigger message comprises downlink control information, DCI.

21. The method according to claim 17 , wherein the dynamic allocation si

Assignees

• Ericsson Telefon Ab L M
• Telefonaktiebolaget Lm Ericcson Publ

Inventors

• Muruganathan Siva
• Frenne Mattias
• Gao Shiwei
• Grant Stephen
• Harrison Robert Mark

Classifications

• H04L25/0224 Primary

  using sounding signals · CPC title

• H04L5/0092

  Indication of how the channel is divided · CPC title

• H04L5/0082

  at predetermined intervals · CPC title

• H04L5/005 Primary

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title