Method, device, computer-readable storage and carrier for random access

Abstract

The present disclosure provides a method for a user equipment, UE, to perform random access to a radio network, comprising: transmitting, from the UE, a random access request containing a preamble to the radio network on a physical random access channel, PRACH, of an uplink physical resource configuration; receiving, at the UE, a random access response for the UE indicating the uplink physical resource configuration on whose PRACH the random access request was sent; and accessing, by the UE, the radio network based on information in the random access response. The present disclosure also provides a corresponding method for a base station, BS, the corresponding devices, computer programs, and computer-readable storage.

1 . A method for a user equipment, UE, to perform random access to a radio network, comprising:
 transmitting, from the UE, a random access request, containing a preamble to the radio network on a physical random access channel, PRACH, of an uplink physical resource configuration;   receiving, at the UE, a random access response for the UE indicating the uplink physical resource configuration on whose PRACH the random access request was sent; and   accessing, by the UE, the radio network based on information in the random access response.   
     
     
         2 . The method of  claim 1 , wherein the uplink physical resource configuration is indicated by the parameter of Random Access Radio Network Temporary Identity, RA-RNTI, in the random access response. 
     
     
         3 . The method of  claim 2 , wherein the RA-RNTI is calculated without association with index of the uplink physical resource configuration. 
     
     
         4 . The method of  claim 2 , wherein the RA-RNTI is calculated as follows:
   RA-RNTI=1+ t _ id+X*f _ id,      wherein t_id refers to an index of a slot where the preamble transmission starts, f_id refers to an index of the PRACH within the slot, f_ids for different uplink physical resource configurations being all unique, and X is the maximum number of slots per radio frame of different uplink physical resource configurations.   
     
     
         5 . The method of  claim 4 , wherein all the f_ids are numbered consecutively. 
     
     
         6 . The method of  claim 2 , wherein the RA-RNTI is calculated as a function of an index of the uplink physical resource configuration. 
     
     
         7 . The method of  claim 2  or  6 , wherein the RA-RNTI is calculated as follows:
   RA-RNTI=1+ t _ id+X*f _ id+X*Y*C _ id,    
 wherein t_id refers to an index of slot where the preamble transmission starts, f_id refers to an index of the PRACH within the slot, X is the maximum number of slots per radio frame of different uplink physical resource configurations, Y is the maximum number of PRACHs in frequency domain of different uplink physical resource configurations, 0≤t_id<X, 0≤f_id<Y, and C_id is the index of the uplink physical resource configuration on whose PRACH the random access request was sent. 
 
     
     
         8 . The method of  claim 1 , wherein the uplink physical resource configuration is indicated by a parameter in Downlink Control Information, DCI. 
     
     
         9 . The method of  claim 8 , wherein the parameter is an index indicating the uplink physical resource configuration. 
     
     
         10 . The method of  claim 8 , wherein the uplink physical resource configuration is identified by Physical Resource Block, PRB, regions dedicated for the uplink physical resource configuration indicated in the DCI. 
     
     
         11 . The method of  claim 1 , wherein the random access response comprises separate grant fields dedicated for respective uplink physical resource configurations, to indicate grants of random access for the UE that sends random access requests on PRACHs of the respective uplink physical resource configurations. 
     
     
         12 .- 13 . (canceled) 
     
     
         14 . A method for a network device to control random access of one or more User Equipments, UEs, to a radio network, comprising:
 receiving, from the UE, a random access request containing a preamble on a physical random access channel, PRACH, of an uplink physical resource configuration;   determining parameters for a random access response for the UE; and   transmitting, by the network device, the random access response indicating the uplink physical resource configuration on whose PRACH the random access request was sent to the UE.   
     
     
         15 . The method of  claim 14 , wherein the uplink physical resource configuration is indicated by the parameter of Random Access Radio Network Temporary Identity, RA-RNTI, in the random access response. 
     
     
         16 . The method of  claim 15 , wherein the RA-RNTI is calculated without association with index of the uplink physical resource configuration. 
     
     
         17 . The method of  claim 15 , wherein the RA-RNTI is calculated as follows:
   RA-RNTI=1+ t _ id+X*f _ id,      wherein t_id refers to an index of a slot where the preamble transmission starts, f_id refers to an index of the PRACH within the slot, f_ids for different uplink physical resource configurations being all unique, and X is the maximum number of slots per radio frame of different uplink physical resource configurations.   
     
     
         18 . The method of  claim 17 , wherein all the f_ids for all uplink physical resource configurations are numbered consecutively. 
     
     
         19 . The method of  claim 15 , wherein the RA-RNTI is calculated as a function of an index of the uplink physical resource configuration. 
     
     
         20 . The method of  claim 15 , wherein the RA-RNTI is calculated as follows:
   RA-RNTI=1+ t _ id+X*f _ id+X*Y*C _ id,      wherein t_id refers to an index of slot where the preamble transmission starts, f_id refers to an index of the PRACH within the slot, X is the maximum number of slots per radio frame of different uplink physical resource configurations, Y is the maximum number of PRACHs in frequency domain of different uplink physical resource configurations, 0≤t_id<X, 0≤f_id<Y, and C_id is the index of the uplink physical resource configuration on whose PRACH the random access request was sent.   
     
     
         21 . The method of  claim 14 , wherein the uplink physical resource configuration is indicated by a parameter in Downlink Control Information, DCI. 
     
     
         22 . The method of  claim 21 , wherein the parameter is an index indicating the uplink physical resource configuration. 
     
     
         23 . The method of  claim 21 , wherein the uplink physical resource configuration is identified by Physical Resource Block, PRB, regions dedicated for the uplink physical resource configuration indicated in the DCI. 
     
     
         24 . The method of  claim 14 , wherein the random access response comprises separate grant fields dedicated for respective uplink physical resource configurations, to indicate grants of random access for the UE that sends random access requests on PRACHs of the respective uplink physical resource configurations. 
     
     
         25 .- 26 . (canceled) 
     
     
         27 . A user equipment, UE, operative in a radio network, to perform random access to the radio network, the UE comprising:
 a processing component; and   a storage component adapted to store instructions therein, such that when the instructions are executed by the processing component, the processing component is configured to:   transmit a random access request containing a preamble to the radio network on a physical random access channel, PRACH, of an uplink physical resource configuration;   receive a random access response for the UE indicating the uplink physical resource configuration on whose PRACH the random access request was sent; and   enable the UE to access the radio network based on information in the random access response.   
     
     
         28 . A network device, operative in a radio network, to control random access of one or more User Equipments, UEs, to the radio network, the network device comprising:
 a processing component; and   a storage component adapted to store instructions therein, such that when the instructions are executed by the processing component, the processing component is configured to:
 receive, from a UE, a random access request containing a preamble on a physical random access channel, PRACH, of an uplink physical resource configuration; 
 determine parameters for a random access response for the UE; and 
 transmit the random access response indicating the uplink physical resource configuration on whose PRACH the random access request was sent to the UE. 
   
     
     
         29 .- 33 . (canceled)