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.
36 . (canceled)
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