Power Control Enhancement for Random Access

Abstract

According to an aspect, a method for communications includes determining whether a random access procedure is initiated for a first service that requires a more reliable random access than a second service. In response to the determination that the random access procedure is initiated for the first service, respective transmit power for one or more messages of the random access procedure is estimated based at least in part on parameter settings for the first service. The messages are transmitted to a network node during the random access procedure by using the respective transmit power.

What is claimed is: 
     
         1 . A method implemented at a radio device, comprising:
 determining whether a random access procedure is initiated for a first service that requires a more reliable random access than a second service;   determining a respective parameter of transmit power for one or more messages of the random access procedure, based at least in part on parameter settings for the first service, in response to the determination that the random access procedure is initiated for the first service; and   transmitting, the one or more messages to a network node during the random access procedure by using an estimated transmit power based on the respective parameter of transmit power.   
     
     
         2 . The method according to  claim 1 , wherein the parameter settings cause the respective transmit power for the one or more messages for the first service to be boosted compared to the second service. 
     
     
         3 . The method according to  claim 1 , wherein the one or more messages comprise at least one of a preamble of physical random access channel and message 3. 
     
     
         4 . The method according to  claim 1 , wherein the parameter settings indicate at least one of the following power parameters:
 a higher initial received target power of a preamble of physical random access channel for the first service than for the second service;   a larger power ramping factor for the preamble of physical random access channel for the first service than for the second service; and   a larger maximum number of preamble transmissions of physical random access channel for the first service than for the second service.   
     
     
         5 . The method according to  claim 1 , wherein the parameter settings indicate at least one of the following power parameters:
 a first increment of an initial received target power of a preamble of physical random access channel for the first service relative to the second service;   a second increment of a power ramping factor for the preamble of physical random access channel for the first service relative to the second service; and   a third increment of a maximum number of preamble transmissions of physical random access channel for the first service relative to the second service.   
     
     
         6 . The method according to  claim 1 , wherein the parameter settings indicate a fourth increment of transmit power for message 3 for the first service relative to the second service. 
     
     
         7 . The method according to  claim 1 , wherein the respective parameter of transmit power for one or more messages of the random access procedure comprises at least one power boost parameter, wherein the estimated transmit power based on the respective parameter of transmit power is achieved by:
 calculating the transmit power for the one or more messages based at least in part on the at least one power boost parameter.   
     
     
         8 . The method according to  claim 1 , wherein the parameter settings are obtained from the network node or predefined at the radio device. 
     
     
         9 . An apparatus, comprising:
 one or more processors; and   one or more memories storing computer program instructions that, when executed by the one or more processors, cause the apparatus to:
 determine whether a random access procedure is initiated for a first service that requires a more reliable random access than a second service; 
 determine a respective parameter of transmit power for one or more messages of the random access procedure, based at least in part on parameter settings for the first service, in response to the determination that the random access procedure is initiated for the first service; and 
 transmit the one or more messages to a network node during the random access procedure by using an estimated transmit power based on at least the respective parameter of transmit power. 
   
     
     
         10 . The apparatus according to  claim 9 , wherein the parameter settings cause the estimated transmit power based on the respective parameter for the one or more messages for the first service to be boosted compared to the second service. 
     
     
         11 . The apparatus according to  claim 9 , wherein the one or more messages comprise at least one of a preamble of physical random access channel and message 3. 
     
     
         12 . The apparatus according to  claim 9 , wherein the parameter settings indicate at least one of the following power parameters:
 a higher initial received target power of a preamble of physical random access channel for the first service than for the second service;   a larger power ramping factor for the preamble of physical random access channel for the first service than for the second service; and   a larger maximum number of preamble transmissions of physical random access channel for the first service than for the second service.   
     
     
         13 . The apparatus according to  claim 9 , wherein the parameter settings indicate at least one of the following power parameters:
 a first increment of an initial received target power of a preamble of physical random access channel for the first service relative to the second service;   a second increment of a power ramping factor for the preamble of physical random access channel for the first service relative to the second service; and   a third increment of a maximum number of preamble transmissions of physical random access channel for the first service relative to the second service.   
     
     
         14 . The apparatus according to  claim 9 , wherein the respective parameter of transmit power for the one or more messages of the random access procedure comprises at least one power boost parameter, wherein execution of the computer instructions causes the apparatus to achieve the estimated transmit power for the one or more messages of the random access procedure based at least on the respective parameter for the first service by:
 calculating the transmit power for the one or more messages based at least in part on the at least one power boost parameter.   
     
     
         15 . The apparatus according to  claim 9 , wherein the parameter settings are obtained from the network node or predefined at the apparatus. 
     
     
         16 . A method implemented at a radio device, comprising:
 configuring parameter settings for a first service and a second service, wherein the first service requires a more reliable random access than the second service; and   transmitting the parameter settings to a terminal device, wherein the parameter settings enable the terminal device to determine a different parameter of transmit power to estimate transmit power for a message of a random access procedure according to whether the random access procedure is initiated for the first service or the second service.   
     
     
         17 . The method according to  claim 16 , wherein the one or more messages comprise at least one of a preamble of physical random access channel and message 3. 
     
     
         18 . The method according to  claim 16 , wherein the parameter settings indicate at least one of the following power parameters:
 a higher initial received target power of a preamble of physical random access channel for the first service than for the second service;   a larger power ramping factor for the preamble of physical random access channel for the first service than for the second service; and   a larger maximum number of preamble transmissions of physical random access channel for the first service than for the second service.   
     
     
         19 . The method according to  claim 16 , wherein the parameter settings indicate at least one of the following power parameters:
 a first increment of an initial received target power of a preamble of physical random access channel for the first service relative to the second service;   a second increment of a power ramping factor for the preamble of physical random access channel for the first service relative to the second service; and   a third increment of a maximum number of preamble transmission of physical random access channel for the first service relative to the second service.   
     
     
         20 . The method according to  claim 19 , wherein the parameter settings indicate a fourth increment of transmit power for message 3 for the first service relative to the second service. 
     
     
         21 . An apparatus, comprising:
 one or more processors; and   one or more memories storing computer instructions that, when executed by the one or more processors, cause the apparatus to:
 configure parameter settings for a first service and a second service, wherein the first service requires a more reliable random access than the second service; and 
 transmit the parameter settings to a terminal device, wherein the parameter settings enable the terminal device to determine a different parameter of transmit power to estimate transmit power for a message of a random access procedure according to whether the random access procedure is initiated for the first service or the second service. 
   
     
     
         22 . The apparatus according to  claim 21 , wherein the one or more messages comprise at least one of a preamble of physical random access channel and message 3. 
     
     
         23 . The apparatus according to  claim 21 , wherein the parameter settings indicate at least one of the following power parameters:
 a higher initial received target power of a preamble of physical random access channel for the first service than for the second service;   a larger power ramping factor for the preamble of physical random access channel for the first service than for the second service; and   a larger maximum number of preamble transmissions of physical random access channel for the first service than for the second service.