Random access collision reduction based on multiple uplink grants

Abstract

Techniques are described for wireless communication. A method for wireless communication at a network access device may include receiving a random access preamble; identifying a quantity of uplink grants to associate with the random access preamble, the identified quantity of uplink grants including at least one uplink grant associated with at least one transmission resource, the identified quantity of uplink grants based at least in part on a time-variable parameter; and transmitting a random access response message including the identified quantity of uplink grants.

What is claimed is: 
     
         1 . A method for wireless communication at a network access device, the method comprising:
 receiving a random access preamble;   identifying a quantity of uplink grants to associate with the random access preamble, the identified quantity of uplink grants including at least one uplink grant associated with at least one transmission resource, the identified quantity of uplink grants based at least in part on a time-variable parameter; and   transmitting a random access response message including the identified quantity of uplink grants.   
     
     
         2 . The method of  claim 1 , wherein the quantity of uplink grants is identified based at least in part on: a network load, or an estimate of a number of collisions between transmissions of the random access preamble by different user equipments (UEs), or an estimate of a quantity of collisions between transmissions by different UEs using a same uplink grant included in the random access response message, or a quantity of channel elements in a receiver of the network access device, or a quantity of available transmission resources, or a time of receipt of the random access preamble, or a combination thereof. 
     
     
         3 . The method of  claim 1 , wherein the identified quantity of uplink grants comprises of one uplink grant. 
     
     
         4 . The method of  claim 1 , wherein the identified quantity of uplink grants comprises a plurality of uplink grants. 
     
     
         5 . The method of  claim 1 , further comprising:
 receiving a transmission, from a user equipment (UE), on a transmission resource associated with an uplink grant of the random access response message.   
     
     
         6 . The method of  claim 5 , further comprising:
 identifying, based at least in part on the transmission resource on which the transmission is received, at least one of: a feature set supported by the UE, or a channel bandwidth supported by the UE, or an amount of data in a transmit buffer of the UE, or a service used by the UE, or a service requirement of the UE, or a QoS requirement of the UE, or an access priority of the UE, or different slices, or a combination thereof.   
     
     
         7 . An apparatus for wireless communication at a network access device, comprising:
 a processor;   memory coupled with the processor; and   instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
 receive a random access preamble; 
 identify a quantity of uplink grants to associate with the random access preamble, the identified quantity of uplink grants including at least one uplink grant associated with at least one transmission resource, the identified quantity of uplink grants based at least in part on a time-variable parameter; and 
 transmit a random access response message including the identified quantity of uplink grants. 
   
     
     
         8 . The apparatus of  claim 7 , wherein the quantity of uplink grants is identified based at least in part on: a network load, or an estimate of a number of collisions between transmissions of the random access preamble by different user equipments (UEs), or an estimate of a quantity of collisions between transmissions by different UEs using a same uplink grant included in the random access response message, or a number of channel elements in a receiver of the network access device, or a number of available transmission resources, or a time of receipt of the random access preamble, or a combination thereof. 
     
     
         9 . The apparatus of  claim 7 , wherein the identified quantity of uplink grants comprises of one uplink grant. 
     
     
         10 . The apparatus of  claim 7 , wherein the identified quantity of uplink grants comprises a plurality of uplink grants. 
     
     
         11 . The apparatus of  claim 7 , wherein the instructions are operable, when executed by the processor, to cause the apparatus to:
 receive a transmission, from a user equipment (UE), on a transmission resource associated with an uplink grant of the random access response message.   
     
     
         12 . The apparatus of  claim 11 , wherein the instructions are operable, when executed by the processor, to cause the apparatus to:
 identify, based at least in part on the transmission resource on which the transmission is received, at least one of: a feature set supported by the UE, or a channel bandwidth supported by the UE, or an amount of data in a transmit buffer of the UE, or a service used by the UE, or a service requirement of the UE, or a QoS requirement of the UE, or an access priority of the UE, or different slices, or a combination thereof.   
     
     
         13 . An apparatus for wireless communication at a network access device, comprising:
 means for receiving a random access preamble;   means for identifying a quantity of uplink grants to associate with the random access preamble, the identified quantity of uplink grants including at least one uplink grant associated with at least one transmission resource, the identified quantity of uplink grants based at least in part on a time-variable parameter; and   means for transmitting a random access response message including the identified quantity of uplink grants.   
     
     
         14 . The apparatus of  claim 13 , wherein the quantity of uplink grants is identified based at least in part on: a network load, or an estimate of a number of collisions between transmissions of the random access preamble by different user equipments (UEs), or an estimate of a quantity of collisions between transmissions by different UEs using a same uplink grant included in the random access response message, or a number of channel elements in a receiver of the network access device, or a number of available transmission resources, or a time of receipt of the random access preamble, or a combination thereof. 
     
     
         15 . The apparatus of  claim 13 , wherein the identified quantity of uplink grants comprises of one uplink grant. 
     
     
         16 . The apparatus of  claim 13 , wherein the identified quantity of uplink grants comprises a plurality of uplink grants. 
     
     
         17 . The apparatus of  claim 13 , further comprising:
 means for receiving a transmission, from a user equipment (UE), on a transmission resource associated with an uplink grant of the random access response message.   
     
     
         18 . The apparatus of  claim 17 , further comprising:
 means for identifying, based at least in part on the transmission resource on which the transmission is received, at least one of: a feature set supported by the UE, or a channel bandwidth supported by the UE, or an amount of data in a transmit buffer of the UE, or a service used by the UE, or a service requirement of the UE, or a QoS requirement of the UE, or an access priority of the UE, or different slices, or a combination thereof.   
     
     
         19 . A non-transitory computer-readable medium storing code for wireless communication at a network access device, the code comprising instructions executable by a processor to:
 receive a random access preamble;   identify a quantity of uplink grants to associate with the random access preamble, the identified quantity of uplink grants including at least one uplink grant associated with at least one transmission resource, the identified quantity of uplink grants based at least in part on a time-variable parameter; and   transmit a random access response message including the identified quantity of uplink grants.   
     
     
         20 . The non-transitory computer-readable medium of  claim 19 , wherein the quantity of uplink grants is identified based at least in part on: a network load, or an estimate of a number of collisions between transmissions of the random access preamble by different user equipments (UEs), or an estimate of a quantity of collisions between transmissions by different UEs using a same uplink grant included in the random access response message, or a number of channel elements in a receiver of the network access device, or a number of available transmission resources, or a time of receipt of the random access preamble, or a combination thereof. 
     
     
         21 . The non-transitory computer-readable medium of  claim 19 , wherein the identified quantity of uplink grants comprises of one uplink grant. 
     
     
         22 . The non-transitory computer-readable medium of  claim 19 , wherein the identified quantity of uplink grants comprises a plurality of uplink grants. 
     
     
         23 . The non-transitory computer-readable medium of  claim 19 , wherein the instructions are further executable by the processor to:
 receiving a transmission, from a user equipment (UE), on a transmission resource associated with an uplink grant of the random access response message.   
     
     
         24 . The non-transitory computer-readable medium of  claim 23 , wherein the instructions are further executable by the processor to:
 identify, based at least in part on the transmission resource on which the transmission is received, at least one of: a feature set supported by the UE, or a channel bandwidth supported by the UE, or an amount of data in a transmit buffer of the UE, or a service used by the UE, or a service requirement of the UE, or a QoS requirement of the UE, or an access priority of the UE, or different slices, or a combination thereof.