Systems and Methods for Reliable Dynamic Indication for Semi-Persistent CSI-RS

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.

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 to commence measurement on a semi-persistent channel state information-reference signal, CSI-RS, resource;   performing a first measurement on the semi-persistent CSI-RS resource;   transmitting, to the network node, a first CSI report based only on the first measurement;   receiving, from the network node, a trigger message that is different than the dynamic allocation signaling, the trigger message triggering semi-persistent CSI reporting; and   initiating semi-persistent reporting.   
     
     
         2 . The method according to  claim 1 , where the dynamic allocation signaling initiates semi-persistent CSI measurements on the CSI-RS resource and also triggers the first CSI report. 
     
     
         3 . The method according to  claim 1 , wherein the dynamic allocation signaling comprises a MAC control element, MAC CE. 
     
     
         4 . The method according to  claim 1 , wherein the trigger message comprises downlink control information, DCI. 
     
     
         5 . The method according to  claim 1 , wherein initiating semi-persistent reporting comprises transmitting a plurality of semi-persistent CSI reports. 
     
     
         6 . The method according to  claim 5 , further comprising:
 ceasing transmission of the plurality of semi-persistent CSI-RS reports after a predetermined length of time.   
     
     
         7 . The method according to  claim 1 , where the first CSI report is an aperiodic report. 
     
     
         8 . The method according to  claim 1 , where the first CSI report is a semi-persistent report. 
     
     
         9 . 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.   
     
     
         10 . 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. 
     
     
         11 . 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. 
 
     
     
         12 . 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.   
     
     
         13 . 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:
 receive, from a network node, dynamic allocation signaling 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; 
 transmit, to the network node, a first CSI report based only on the first measurement; 
 receive, from the network node, a trigger message that is different than the dynamic allocation signaling, the trigger message triggering semi-persistent CSI reporting; and 
 initiate semi-persistent reporting. 
   
     
     
         14 . The wireless device according to  claim 13 , where the dynamic allocation signaling initiates semi-persistent CSI measurements on the CSI-RS resource and also triggers the first CSI report. 
     
     
         15 . The wireless device according to  claim 13 , wherein the dynamic allocation signaling comprises a MAC control element. MAC CE. 
     
     
         16 . The wireless device according to  claim 13 , wherein the trigger message comprises downlink control information, DCI. 
     
     
         17 . The wireless device according to  claim 13 , wherein initiating semi-persistent reporting comprises transmitting a plurality of semi-persistent CSI reports. 
     
     
         18 . The wireless device according to  claim 17 , 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.   
     
     
         19 .- 24 . (canceled) 
     
     
         25 . 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 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;   determining whether a first CSI report is transmitted by the wireless device in response to the dynamic allocation signaling; and   taking an action based on whether the first CSI report is received in response to the dynamic allocation signaling.   
     
     
         26 . The method according to  claim 25 , wherein the dynamic allocation signaling comprises a MAC control element, MAC CE. 
     
     
         27 . The method of  claim 25 , wherein:
 determining whether the first CSI report is transmitted by the wireless device comprises:
 receiving the first CSI report from the wireless device; and 
 based on receiving the first CSI report, determining that the wireless device successfully received the dynamic allocation signaling; and 
 taking the action further comprises continuing transmission of semi-persistent CSI-RS with preconfigured periodicity. 
   
     
     
         28 . The method of  claim 25 , wherein:
 determining whether the first CSI report is transmitted by the wireless device comprises:
 determining that the first CSI report is not received from the wireless device; and 
 based on not receiving the first CSI report, determining that the wireless device did not successfully receive the dynamic allocation signaling; and 
   taking the action further comprises retransmitting the dynamic allocation signaling to the wireless device.   
     
     
         29 . The method according to  claim 25 , further comprising:
 transmitting a trigger message that is different from the dynamic allocation signaling; and   in response to the trigger message, receiving at least one semi-persistent CSI report in addition to the first CSI report.   
     
     
         30 . The method according to  claim 29 , wherein the trigger message comprises downlink control information, DCI. 
     
     
         31 . The method according to  claim 25 , 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.   
     
     
         32 . The method according to  claim 25 , 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. 
     
     
         33 . The method according to  claim 25  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. 
 
     
     
         34 . The method according to  claim 25 , further comprising:
 transmitting dynamic deallocation signaling to terminate the measurement on the semi-persistent CSI-RS resource by the wireless device;   determine whether a second CSI report is transmitted by the wireless device in response to the dynamic deallocation signaling; and   take an action based on whether the second CSI report is transmitted by the wireless device in response to the dynamic allocation signaling.   
     
     
         35 . A network node for initiating semi-persistent channel state information, CSI, measurements, the network node comprising:
 a memory storing instructions; and   processing circuitry operable to execute the instructions to cause the network node to:
 transmit, to the wireless device, dynamic allocation signaling 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; 
 determine whether a first CSI report is transmitted by the wireless device in response to the dynamic allocation signaling; and 
 take an action based on whether the first CSI report is received in response to the dynamic allocation trigger. 
   
     
     
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