New dci formats for non-anchor operations

Abstract

According to certain embodiments, a method for use in a network node comprises broadcasting system information to wireless devices. The system information indicates a set of configured random access carriers. The method further comprises selecting, from the set of configured random access carriers, a random access carrier to be used by a wireless device when performing random access transmissions, and indicating the selected random access carrier to the wireless device.

1 . A method for use in a wireless device, the method comprising:
 receiving system information being broadcast by a network node, wherein the system information indicates a set of configured random access carriers supported by the network node;   determining whether the network node has indicated a selected random access carrier from the set of configured random access carriers;   in response to determining that the network node has indicated the selected random access carrier, performing the random access transmission using the selected random access carrier indicated by the network node; and   in response to determining that the network node has not indicated the selected random access carrier, performing the random access transmission using a random access carrier that the wireless device selects from the set of configured random access carriers.   
     
     
         2 . The method of  claim 1 , further comprising determining that the network node has indicated the selected random access carrier based on receiving downlink control information, DCI, from the network node that explicitly indicates the selected random access carrier to the wireless device, the DCI received via a control channel. 
     
     
         3 . The method of  claim 2 , wherein the control channel comprises a physical downlink control channel (PDCCH) or a Narrowband PDCCH (NPDCCH) and wherein the control channel order comprises a PDCCH order or an NPDCCH order, is sent to the wireless device in connected mode, and orders the wireless device to perform a random access transmission on the random access carrier. 
     
     
         4 . The method of  claim 2 , wherein the DCI is received via a scheduling message, wherein the scheduling message schedules a paging message and indicates the selected random access carrier to be used by the wireless device when performing the random access transmission that is initiated in response to the wireless device receiving the paging message. 
     
     
         5 . The method of  claim 4 , wherein the scheduling message is sent to the wireless device in idle mode, and wherein the scheduling message comprises an index indicating the selected random access carrier. 
     
     
         6 . The method of  claim 1 , wherein the system information broadcast by the network node provides information about downlink, DL, carriers and uplink, UL, carriers, the UL carriers belonging to the set of configured random access carriers. 
     
     
         7 . The method of  claim 6 , wherein the information about the carriers indicates an association between one of the DL carriers and a default UL carrier. 
     
     
         8 . The method of  claim 6 , wherein indicating the selected random access carrier to the wireless device comprises communicating a message via one of the DL carriers, wherein communicating the message via that DL carrier implicitly indicates for the wireless device to perform the random access transmission using the default UL carrier associated with the DL carrier that communicated the message. 
     
     
         9 . The method of  claim 1 , further comprising determining that the network node has indicated the selected random access carrier based on receiving a paging message from the network node via a Physical Downlink Shared Channel, PDSCH, wherein the paging message indicates the selected random access carrier to be used by the wireless device when performing the random access transmission that is initiated in response to the wireless device receiving the paging message. 
     
     
         10 . A wireless device, the wireless device comprising:
 one or more interfaces operable to receive system information being broadcast by a network node, wherein the system information indicates a set of configured random access carriers supported by the network node; and   one or more processors configured to:
 determine whether the network node has indicated a selected random access carrier from the set of configured random access carriers; 
 in response to determining that the network node has indicated the selected random access carrier, perform a random access transmission using the selected random access carrier indicated by the network node; and 
 in response to determining that the network node has not indicated the selected random access carrier, perform a random access transmission using a random access carrier that the wireless device selects from the set of configured random access carriers. 
   
     
     
         11 . The wireless device of  claim 10 , wherein the processor is further configured to determine that the network node has indicated the selected random access carrier based on receiving downlink control information, DCI, from the network node that explicitly indicates the selected random access carrier to the wireless device, the DCI received via a control channel. 
     
     
         12 . The wireless device of  claim 11 , wherein the control channel comprises a physical downlink control channel (PDCCH) or a Narrowband PDCCH (NPDCCH) and wherein the control channel order comprises a PDCCH order or an NPDCCH order, is sent to the wireless device in connected mode, and orders the wireless device to perform a random access transmission on the random access carrier. 
     
     
         13 . The wireless device of  claim 11 , wherein the DCI is received via a scheduling message, wherein the scheduling message schedules a paging message and indicates the selected random access carrier to be used by the wireless device when performing the random access transmission that is initiated in response to the wireless device receiving the paging message. 
     
     
         14 . The wireless device of  claim 13 , wherein the scheduling message is sent to the wireless device in idle mode, and wherein the scheduling message comprises an index indicating the selected random access carrier. 
     
     
         15 . The wireless device of  claim 10 , wherein the system information broadcast by the network node provides information about downlink, DL, carriers and uplink, UL, carriers, the UL carriers belonging to the set of configured random access carriers. 
     
     
         16 . The wireless device of  claim 15 , wherein the information about the carriers indicates an association between one of the DL carriers and a default UL carrier. 
     
     
         17 . The wireless device of  claim 15 , wherein indicating the selected random access carrier to the wireless device comprises communicating a message via one of the DL carriers, wherein communicating the message via that DL carrier implicitly indicates for the wireless device to perform the random access transmission using the default UL carrier associated with the DL carrier that communicated the message. 
     
     
         18 . The wireless device of  claim 10 , wherein the processor is further configured to determine that the network node has indicated the selected random access carrier based on receiving a paging message from the network node via a Physical Downlink Shared Channel, PDSCH, wherein the paging message indicates the selected random access carrier to be used by the wireless device when performing the random access transmission that is initiated in response to the wireless device receiving the paging message.