Antenna Panel Update Procedures

Abstract

In wireless communications, antenna panels may be associated with a different quantity of sounding reference signal (SRS) antenna port numbers. When transmitting transport blocks for a configured uplink grant, a transmission precoder may be determined based on a configured transmit precoding field and SRS antenna port number. Multiple values may be configured for the transmit precoding field. At least some values may be associated with a quantity of SRS antenna port numbers.

What is claimed is: 
     
         1 . A method comprising:
 receiving, by a wireless device, one or more configuration parameters indicating, for a configured uplink grant:
 a first value, of a transmit precoding field, associated with a first quantity of antenna ports; and 
 a second value, of the transmit precoding field, associated with a second quantity of antenna ports; 
   sending, using the first value of the transmit precoding field, a first transport block associated with the configured uplink grant; and   based on receiving downlink control information (DCI) indicating the second quantity of antenna ports, sending, using the second value of the transmit precoding field, a second transport block associated with the configured uplink grant.   
     
     
         2 . The method of  claim 1 , wherein the one or more configuration parameters indicate, for the configured uplink grant, a sounding reference signal (SRS) resource. 
     
     
         3 . The method of  claim 2 , wherein the one or more configuration parameters indicate, for the SRS resource, the first quantity of antenna ports. 
     
     
         4 . The method of  claim 1 , wherein:
 the sending the first transport block further comprises sending, using a first transmission precoder corresponding to the first value, the first transport block; and   the sending the second transport block further comprises sending, using a second transmission precoder corresponding to the second value, the second transport block.   
     
     
         5 . The method of  claim 4 , further comprising:
 determining the first transmission precoder based on:
 a quantity of layers of the first transport block; and 
 precoding information of the first transport block; and 
   determining the second transmission precoder based on:
 a quantity of layers of the second transport block; and 
 precoding information of the second transport block. 
   
     
     
         6 . The method of  claim 1 , further comprising:
 setting, based on the receiving the DCI, a quantity of antenna ports of an SRS resource associated with the configured uplink grant to the second quantity of antenna ports.   
     
     
         7 . The method of  claim 1 , further comprising:
 sending a wireless device capability message indicating:
 a maximum quantity of antenna ports for one or more antenna panels at the wireless device. 
   
     
     
         8 . A method comprising:
 receiving, by a wireless device, one or more configuration parameters indicating at least two values for a transmit precoding field of a configured uplink grant;   sending, using the first value of the at least two values for the transmit precoding field, a first transport block associated with the configured uplink grant, wherein the first value is associated with a first quantity of antenna ports;   based on receiving downlink control information (DCI) indicating a second quantity of antenna ports associated with a second value of the at least two values for the transmit precoding field, setting a quantity of antenna ports of a sounding reference signal (SRS) resource associated with the configured uplink grant to the second quantity of antenna ports; and   sending, using the second value for the transmit precoding field, a second transport block associated with the configured uplink grant.   
     
     
         9 . The method of  claim 8 , wherein the one or more configuration parameters indicate, for the configured uplink grant, the SRS resource. 
     
     
         10 . The method of  claim 8 , wherein:
 the sending the first transport block further comprises sending, using a first transmission precoder corresponding to the first value, the first transport block; and   the sending the second transport block further comprises sending, using a second transmission precoder corresponding to the second value, the second transport block.   
     
     
         11 . The method of  claim 10 , further comprising:
 determining the first transmission precoder based on:
 a quantity of layers of the first transport block; and 
 precoding information of the first transport block; and 
   determining the second transmission precoder based on:
 a quantity of layers of the second transport block; and 
 precoding information of the second transport block. 
   
     
     
         12 . The method of  claim 8 , further comprising:
 receiving a control command indicating activation of a first transmission configuration indicator (TCI) state for the SRS resource, wherein the first TCI state indicates a first reference signal associated with a first antenna panel, of a plurality of antenna panels, at the wireless device, and wherein the DCI indicates activation of a second TCI state for the SRS resource, and wherein the second TCI state indicates a second reference signal associated with a second antenna panel, of the plurality of antenna panels, at the wireless device.   
     
     
         13 . The method of  claim 8 , further comprising:
 sending a wireless device capability message indicating:
 a first maximum quantity of antenna ports for a first antenna panel at the wireless device; and 
 a second maximum quantity of antenna ports for a second antenna panel at the wireless device. 
   
     
     
         14 . The method of  claim 8 , wherein the DCI indicates activation of a TCI state, for the SRS resource, indicating a reference signal associated with an antenna panel, of a plurality of antenna panels, at the wireless device, and wherein the reference signal being associated with the antenna panel comprises receiving or transmitting the reference signal with the antenna panel. 
     
     
         15 . A method comprising:
 sending, by a base station, one or more configuration parameters indicating at least two values for a transmit precoding field of a configured uplink grant;   receiving, using a first value of the at least two values for the transmit precoding field, a first transport block associated with the configured uplink grant, wherein the first value is associated with a first quantity of antenna ports; and   based on sending downlink control information (DCI) indicating a second quantity of antenna ports associated with a second value of the at least two values for the transmit precoding field, receiving, using the second value for the transmit precoding field, a second transport block associated with the configured uplink grant.   
     
     
         16 . The method of  claim 15 , wherein the one or more configuration parameters indicate, for the configured uplink grant, a sounding reference signal (SRS) resource. 
     
     
         17 . The method of  claim 15 , wherein:
 the receiving the first transport block further comprises receiving, using a first transmission precoder corresponding to the first value, the first transport block; and   the receiving the second transport block further comprises receiving, using a second transmission precoder corresponding to the second value, the second transport block.   
     
     
         18 . The method of  claim 15 , further comprising:
 sending a control command indicating activation of a first transmission configuration indicator (TCI) state for a sounding reference signal (SRS) resource associated with the configured uplink grant, wherein the first TCI state indicates a first reference signal associated with a first antenna panel, of a plurality of antenna panels, at a wireless device, wherein the DCI indicates activation of a second TCI state for the SRS resource, and wherein the second TCI state indicates a second reference signal associated with a second antenna panel, of the plurality of antenna panels, at the wireless device.   
     
     
         19 . The method of  claim 15 , further comprising:
 setting, based on the sending the DCI, a quantity of antenna ports associated with the configured uplink grant to the second quantity of antenna ports.   
     
     
         20 . The method of  claim 15 , further comprising:
 receiving a wireless device capability message indicating a plurality of maximum quantity of antenna ports for a plurality of antenna panels at a wireless device; and   sending an indication of a value of the at least two values for the transmit precoding field, wherein the value is based on a lowest maximum quantity of antenna ports among the plurality of maximum quantity of antenna ports.