Indicating a subset of TX RX antennas for SRS antenna switching via MAC-CE
According to certain embodiments, a method performed by a wireless device comprises receiving sounding reference signal (SRS) configuration information from a network node. The SRS configuration information indicates a configuration associated with one or more SRS resources. At least a portion of the SRS configuration information is received in one or more Medium Access Control-Control Element (MAC-CE) messages. The method further comprises configuring the one or more SRS resources based at least in part on the SRS configuration information.
1 . A method performed by a wireless device, the method comprising:
receiving sounding reference signal (SRS) configuration information from a network node, the SRS configuration information indicating a configuration associated with one or more SRS resources, wherein at least a portion of the SRS configuration information is received in one or more Medium Access Control-Control Element (MAC-CE) messages, wherein the one or more MAC-CE messages comprise one or more SRS resource identifiers and, for each SRS resource identifier, an indication whether to use an SRS resource corresponding to said SRS resource identifier; and
configuring the one or more SRS resources based at least in part on the SRS configuration information.
2 . A method performed by a network node, the method comprising:
sending sounding reference signal (SRS) configuration information to a wireless device, the SRS configuration information indicating a configuration associated with one or more SRS resources, wherein at least a portion of the SRS configuration information is sent in one or more Medium Access Control-Control Element (MAC-CE) messages, wherein the one or more MAC-CE messages comprise one or more SRS resource identifiers and, for each SRS resource identifier, an indication whether to use an SRS resource corresponding to said SRS resource identifier.
3 . The method of claim 2 , further comprising receiving one or more SRSs from the wireless device configured according to the SRS configuration information.
4 . The method of claim 3 , further comprising using information determined based on the SRSs to perform at least one of: scheduling, link adaptation, MIMO operations, and/or beam management.
5 . The method of claim 2 , further comprising, prior to sending the SRS configuration information to the wireless device, determining the SRS configuration information to be sent.
6 . The method of claim 5 , wherein the SRS configuration information is determined based at least in part on capability information received from the wireless device, the capability information indicating that the wireless device supports multiple antenna switching configurations.
7 . The method of claim 5 , wherein the SRS configuration information is determined based at least in part based on radio conditions, network conditions, and/or wireless device performance.
8 . The method of claim 2 , wherein the SRS configuration information indicates a number of SRS ports configured per each of the one or more SRS resources.
9 . The method of claim 2 , wherein the SRS configuration information indicates the configuration according to one or more SRS resource sets.
10 . The method of claim 9 , wherein each of the indicated SRS resource set(s) comprises at least one of the SRS resources to be configured based on the SRS configuration information.
11 . The method of claim 2 , wherein the SRS configuration information comprises one or more SRS resource set identifiers, each SRS resource set identifier indicating a respective set of the SRS resources to which a portion of the SRS configuration information that is associated with said SRS resource set identifier applies.
12 . The method of claim 11 , wherein the SRS resource set identifier is associated with a list of SRS resource identifiers corresponding to the one or more SRS resources belonging to said SRS resource set.
13 . The method of claim 2 , wherein the SRS configuration information indicates to activate or deactivate one or more of the indicated SRS resources.
14 . The method of claim 2 , wherein the SRS configuration information indicates to activate or deactivate one or more of the SRS resource sets, wherein activating a given SRS resource set comprises activating each SRS resource in said SRS resource set and deactivating the given SRS resource set comprises deactivating each SRS resource in said SRS resource set.
15 . The method of claim 2 , wherein the SRS configuration information indicates to activate or deactivate a given SRS resource with respect to each SRS resource set in which said SRS resource has been configured.
16 . The method of claim 2 , wherein the SRS configuration information indicates to activate or deactivate one or more of the SRS resource(s) for a given SRS resource set.
17 . The method of claim 2 , wherein the SRS configuration information indicates to change a number of SRS ports for at least one of the one or more SRS resources.
18 . The method of claim 17 , wherein, when the number of SRS ports is reduced, the SRS configuration information further indicates which of the SRS ports should remain configured.
19 . The method of claim 2 , wherein the SRS configuration information indicates which antennas of the wireless device are to be sounded.
20 . The method of claim 2 wherein the SRS configuration information indicates to change a number of SRS ports for all of the SRS resources in an SRS resource set.
21 . The method of claim 2 , wherein the SRS configuration information indicates to change a number of SRS ports per SRS resource for one SRS resource set.
22 . The method of claim 2 , wherein the SRS configuration information indicates an antenna switching configuration (ASC).
23 . The method of claim 2 , further comprising: sending at least a portion of the SRS configuration information in radio resource control (RRC) signaling.
24 . The method of claim 23 , wherein the RRC signaling initializes the SRS configuration information and the one or more MAC CE messages update the SRS configuration information.
25 . A wireless device, the wireless device comprising:
power supply circuitry configured to supply power to the wireless device; and
processing circuitry configured to:
receive sounding reference signal (SRS) configuration information from a network node, the SRS configuration information indicating a configuration associated with one or more SRS resources, wherein at least a portion of the SRS configuration information is received in one or more Medium Access Control-Control Element (MAC-CE) messages, wherein the one or more MAC-CE messages comprise one or more SRS resource identifiers and, for each SRS resource identifier, an indication whether to use an SRS resource corresponding to said SRS resource identifier; and
configure the one or more SRS resources based at least in part on the SRS configuration information.
26 . A network node, the network node comprising:
power supply circuitry configured to supply power to the network node; and
processing circuitry configured to:
send sounding reference signal (SRS) configuration information to a wireless device, the SRS configuration information indicating a configuration associated with one or more SRS resources, wherein at least a portion of the SRS configuration information is sent in one or more Medium Access Control-Control Element (MAC-CE) messages, wherein the one or more MAC-CE messages comprise one or more SRS resource identifiers and, for each SRS resource identifier, an indication whether to use an SRS resource corresponding to said SRS resource identifier.