Signaling in rrc and mac for pdsch resource mapping for periodic and semipersistent reference signal assumptions

Abstract

Systems and methods for activating a Semi-Persistent (SP) Zero Power (ZP) Channel State Information Reference Signal (CSI-RS) are provided. In some embodiments, a method performed by a wireless device includes for activating SP ZP CSI-RS includes receiving, from a network node, a control message that indicates the activation of one or more SP ZP CSI-RS resources; and activating, based on the control message, the one or more SP ZP CSI-RS resources. In this way, ZP CSI-RS may be used for rate matching around other wireless devices and a SP ZP CSI-RS resource may be activated without activating any Non-Zero Power (NZP) CSI-RS, CSI-Interference Measurement (CSI-IM), or CSI reporting for the wireless device.

What is claimed is: 
     
         1 . A communication system including a host computer comprising:
 processing circuitry configured to provide user data; and   a communication interface configured to forward the user data to a cellular network for transmission to a user equipment (UE), wherein the cellular network comprises a base station, the base station comprising base station processing circuitry configured to:
 transmit, to the UE, a configuration for Semi-Persistent (SP) Zero Power (ZP) Channel State Information Reference Signal (CSI-RS) and a second configuration for CSI-Interference Measurement (CSI-IM); 
 transmit, to the UE, a first control message that indicates activation of one or more SP ZP CSI-RS resources where the first control message is separate from a second control message indicating activation of SP Non-Zero Power (NZP) CSI-RS or SP CSI-IM resources, wherein the first control message and the second control message are Medium Access Control (MAC) Control Element (CE) based; and 
 transmit, to the UE, the forwarded user data. 
   
     
     
         2 . The communication system of  claim 1 , wherein the first control message comprises a bitmap, where the bitmap indicates if one SP ZP CSI-RS resource set is active or not. 
     
     
         3 . The communication system of  claim 2 , wherein the one SP ZP CSI-RS resource set to which the bitmap refers is a Radio Resource Control (RRC) configured list of SP ZP CSI-RS resources. 
     
     
         4 . The communication system of  claim 1 , wherein the first control message comprises one or more identifiers, where each identifier identifies a preconfigured SP ZP CSI-RS resource set. 
     
     
         5 . The communication system of  claim 1 , wherein in response to activating the one or more SP ZP CSI-RS resources, Physical Downlink Shared Channel (PDSCH) resource maps around the one or more SP ZP CSI-RS resources. 
     
     
         6 . The communication system of  claim 1 , wherein the base station processing circuitry is further configured to:
 transmit, to the UE, a deactivation control message that indicates the deactivation of the one or more SP ZP CSI-RS resources where the deactivation control message is a MAC CE.   
     
     
         7 . The communication system of  claim 1 , wherein in response to deactivating the one or more SP ZP CSI-RS resources, the UE stops Physical Downlink Shared Channel (PDSCH) resource mapping around resources for the one or more SP ZP CSI-RS. 
     
     
         8 . A communication system including a host computer comprising:
 processing circuitry configured to provide user data; and   a communication interface configured to forward the user data to a cellular network for transmission to a user equipment (UE), wherein the cellular network comprises a base station, the base station comprising base station processing circuitry configured to:
 transmit, to the UE, a configuration for Semi-Persistent (SP) Zero Power (ZP) Channel State Information Reference Signal (CSI-RS) and a second configuration for CSI-Interference Measurement (CSI-IM); 
 transmit, to the UE, a first control message that indicates activation of one or more SP ZP CSI-RS resources where the first control message is separate from a second control message indicating activation of SP Non-Zero Power (NZP) CSI-RS or SP CSI-IM resources, wherein the first control message and the second control message are Medium Access Control (MAC) Control Element (CE) based; and 
 transmit, to the UE, the forwarded user data after activation of the one or more SP ZP CSI-RS resources. 
   
     
     
         9 . The communication system of  claim 8 , wherein the first control message comprises a bitmap, if one SP ZP CSI-RS resource set is active or not. 
     
     
         10 . The communication system of  claim 9 , wherein the one SP ZP CSI-RS resource set to which the bitmap refers is a Radio Resource Control (RRC) configured list of SP ZP CSI-RS resources. 
     
     
         11 . The communication system of  claim 8 , wherein the first control message comprises one or more identifiers, where each identifier identifies a preconfigured SP ZP CSI-RS resource set. 
     
     
         12 . The communication system of  claim 8 , wherein in response to activating the one or more SP ZP CSI-RS resources, Physical Downlink Shared Channel (PDSCH) resource maps around the one or more SP ZP CSI-RS resources. 
     
     
         13 . The communication system of  claim 8 , wherein the processing circuitry provides user data by a host application executing on the processing circuitry. 
     
     
         14 . The communication system of  claim 13 , wherein the UE is configured with a client application to receive the forwarded user data from the host application. 
     
     
         15 . A host computer comprising:
 processing circuitry configured to provide user data; and   a communication interface configured to forward the user data to a cellular network for transmission to a wireless device, wherein the cellular network comprises a base station, the base station comprising base station processing circuitry configured to:
 transmit, to the wireless device, a configuration for Semi-Persistent (SP) Zero Power (ZP) Channel State Information Reference Signal (CSI-RS) and a second configuration for CSI-Interference Measurement (CSI-IM); 
 transmit, to the wireless device, a first control message that indicates activation of one or more SP ZP CSI-RS resources where the first control message is separate from a second control message indicating activation of SP Non-Zero Power (NZP) CSI-RS or SP CSI-IM resources, wherein the first control message and the second control message are Medium Access Control (MAC) Control Element (CE) based; and 
 transmit, to the wireless device, the forwarded user data after activation of the one or more SP ZP CSI-RS resources. 
   
     
     
         16 . The host computer of  claim 15 , wherein the processing circuitry provides user data by a host application. 
     
     
         17 . The host computer of  claim 16 , wherein the user data is requested by a client application executing on the wireless device. 
     
     
         18 . The host computer of  claim 15 , wherein the first control message comprises one or more identifiers, where each identifier identifies a preconfigured SP ZP CSI-RS resource set. 
     
     
         19 . The host computer of  claim 15 , wherein in response to activating the one or more SP ZP CSI-RS resources, the Physical Downlink Shared Channel (PDSCH) resource maps around the one or more SP ZP CSI-RS resources. 
     
     
         20 . The host computer of  claim 15 , wherein the base station processing circuitry is further configured to:
 transmit, to the UE, a deactivation control message that indicates the deactivation of the one or more SP ZP CSI-RS resources where the deactivation control message is a MAC CE.