Random Access Method for Multiple Numerology Operation

Abstract

The present disclosure introduces methods and apparatus for configuring or preconfiguring random access procedures when there are multiple configurable numerologies for one carrier. In some embodiments, the random access numerology of the wireless device is configured using the system information block. In other embodiments, the random access numerology used by the wireless device is determined implicitly based on the detection of one or more synchronization signals.

What is claimed is: 
     
         1 . A method of random access implemented by a wireless device in a mixed numerology wireless communication network, said method comprising:
 receiving a system information block (SIB) from a network node, said SIB containing configuration information indicating a configuration for random access;   selecting a first numerology for random access from two or more numerologies available for random access as indicated by the configuration information; and   performing a random access on a first carrier configured according to the first numerology to establish a connection with the network node.   
     
     
         2 . The method of  claim 1  wherein the first configuration information comprises a default configuration for random access. 
     
     
         3 . The method of  claim 1  further comprising selecting the second carrier based on at least one of a device type of the wireless device, traffic type, configuration received from the network or predefined slice selection rules. 
     
     
         4 . The method of  claim 1  wherein switching to a second carrier configured according to a second numerology comprises:
 obtaining a time advance for the first carrier; and 
 using the time advance for the first carrier for the data transmissions in the second carrier. 
 
     
     
         5 . The method of  claim 4  further comprising deriving a power adjustment for data transmissions on the second carrier based on accumulated power adjustments on the first carrier. 
     
     
         6 . The method of  claim 1  wherein switching to a second carrier configured according to a second numerology comprises:
 obtaining a time advance for the second carrier; and 
 using the time advance for the second carrier for data transmissions in the second carrier. 
 
     
     
         7 . The method of  claim 6  wherein obtaining a time advance for the second carrier comprises:
 transmitting a random access preamble in the second carrier; and 
 receiving a random access response including the time advance for the second carrier. 
 
     
     
         8 . The method of  claim 6  wherein obtaining a time advance for the second carrier comprises:
 transmitting a reference signal in the second carrier; and 
 receiving a response message responsive to the transmission of the reference signal including the time advance for the second carrier. 
 
     
     
         9 . The method of  claim 1  wherein determining a first numerology for random access based on the configuration information comprises:
 generating, based on said configuration information, a mapping associating service types to corresponding numerologies; 
 determining a service type for the connection with the network node; and 
 determining the first numerology based on the service type. 
 
     
     
         10 . The method of  claim 1  wherein selecting the first numerology from the two or more numerologies available for random access as indicated by said configuration information comprises:
 determining a service type for the connection with the network node; and 
 selecting the first numerology from said available numerologies based on the service type. 
 
     
     
         11 . The method of  claim 1  wherein selecting the first numerology from the two or more numerologies available for random access as indicated by said configuration information comprises:
 determining a device type of the wireless device; and 
 selecting the first numerology from said available numerologies based on the device type. 
 
     
     
         12 . The method of  claim 1  further comprising:
 after establishing a connection with the network node, switching to a preferred second numerology for a data transmission, the second numerology being different than the first numerology; and 
 transmitting data on a shared uplink channel using the second numerology. 
 
     
     
         13 . A method implemented by a network node in a mixed numerology wireless communication network, said method comprising:
 transmitting a system information block (SIB) to a wireless device in an area served by the network node, said SIB containing configuration information for random access enabling said wireless device to determine a first numerology for random access, wherein the configuration information indicates two or more available numerologies for random access;   monitoring random access channels in one or more carriers configured according to the two or more of said available numerologies;   receiving a random access preamble from the wireless device on a first carrier configured according to the first numerology; and   receiving uplink transmissions from the wireless device on a shared uplink channel in a second carrier configured according to a second numerology different from the first numerology.   
     
     
         14 . A wireless device configured for use in a mixed numerology wireless communication network, the wireless device comprising:
 an interface circuit for communicating with a network node;   a processing circuit configured to:
 receive a system information block (SIB) from a network node in said wireless communication network, said SIB containing configuration information indicating a configuration for random access; 
 select the first numerology from two or more numerologies available for random access as indicated by said configuration information; and 
 perform a random access on a first carrier configured according to the first numerology to establish a connection with the network node 
   
     
     
         15 . The wireless device of  claim 14  wherein the first configuration information comprises a default configuration for random access. 
     
     
         16 . The wireless device of  claim 14  wherein the processing circuit is further configured to select the second carrier based on at least one of a device type of the wireless device, traffic type, configuration received from the network or predefined slice selection rules. 
     
     
         17 . The wireless device of  claim 14  wherein the processing circuit is further configured to:
 obtain a time advance for the first carrier; and 
 use the time advance for the first carrier for the data transmissions in the second carrier. 
 
     
     
         18 . The wireless device of  claim 14  wherein the processing circuit is further configured to derive a power adjustment for data transmissions on the second carrier based on accumulated power adjustments on the first carrier. 
     
     
         19 . The wireless device of  claim 14  wherein the processing circuit is further configured to:
 obtain a time advance for the second carrier; and 
 use the time advance for the second carrier for data transmissions in the second carrier. 
 
     
     
         20 . The wireless device of  claim 19  wherein the processing circuit is further configured to:
 transmit a random access preamble in the second carrier; and 
 receive a random access response including the time advance for the second carrier. 
 
     
     
         21 . The wireless device of  claim 19  wherein the processing circuit is further configured to:
 transmit a reference signal in the second carrier; and 
 receive a response message responsive to the transmission of the reference signal including the time advance for the second carrier. 
 
     
     
         22 . The wireless device of  claim 14  wherein the processing circuit is further configured to:
 generate, based on said configuration information, a mapping associating service types to corresponding numerologies; 
 determine a service type for the connection with the network node; and 
 determine the first numerology based on the service type. 
 
     
     
         23 . The wireless device of  claim 14  wherein the processing circuit is further configured to:
 determine a service type for the connection with the network node; and 
 select the first numerology from said available numerologies based on the service type. 
 
     
     
         24 . The wireless device of  claim 14  wherein the processing circuit is further configured to:
 determine a device type of the wireless device; and 
 select the first numerology from said available numerologies based on the device type. 
 
     
     
         25 . The wireless device of  claim 14 , wherein the processing circuit is further configured to:
 after establishing a connection with the network node, switch to a preferred second numerology for a data transmission, the second numerology being different than the first numerology; and   transmit data on a shared uplink channel using the second numerology.   
     
     
         26 . A network node in a mixed numerology wireless communication network, the network node comprising:
 an interface circuit for communicating with wireless devices in an area served by the network node;   a processing circuit configured to:
 transmit a system information block (SIB) to wireless devices in an area served by the network node, said SIB containing configuration information for random access enabling said wireless devices to determine a first numerology for random access, wherein the configuration information indicates two or more available numerologies for random access; 
 monitor random access channels in carriers configured according to two or more of said available numerologies; and 
 receive uplink transmissions from the wireless device on a shared uplink channel in a second carrier configured according to a second numerology different from the first numerology.