Robust grant-free transmissions
Various arrangements for performing uplink grant-free transmissions are presented herein. An instance of user equipment (UE) may determine data that is to be transmitted using a grant-free (GF) uplink transmission to a base station of a cellular network. The UE may select a first GF resource block and a second GF resource block. The UE may transmit GF transmissions that comprise: a data payload and a first pointer at the first GF resource block; and the data payload and a second pointer at the second GF resource block. The first pointer may refer to the second GF resource block, while the second pointer may refer to the first GP resource block.
1. A method for performing grant-free uplink transmissions, the method comprising:
determining, by a first user equipment (UE), data that is to be transmitted using a grant-free uplink transmission to a base station of a cellular network;
selecting, by the first UE, a first grant-free resource block, wherein:
a plurality of grant-free resource blocks define a plurality of subcarrier frequencies and a plurality of timeslots for data to be transmitted to the base station of the cellular network without a reservation by the first UE;
selecting, by the first UE, a second grant-free resource block; and
transmitting, by the first UE, a first grant-free transmission that comprises a data payload and a first pointer at the first grant-free resource block, wherein:
the first pointer refers to the second grant-free resource block;
transmitting, by the first UE, a second grant-free transmission that comprises the data payload and a second pointer at the second grant-free resource block, wherein:
the second pointer refers to the first grant-free resource block;
receiving, by the base station, the first grant-free transmission transmitted by the first UE on the first grant-free resource block;
detecting, by the base station, a collision on the second grant-free resource block, wherein the collision results from the second grant-free transmission being received during a same timeslot and a same frequency as a third grant-free transmission from a second UE distinct from the first UE; and
based on the first pointer of the first grant-free transmission, performing interference cancelation to subtract at least a portion of the first grant-free transmission from the received collision to reconstruct the third grant-free transmission transmitted by the second UE at the second grant-free resource block.
2. The method for performing grant-free uplink transmissions of claim 1 , wherein the first grant-free resource block and the second grant-free resource block occur during different timeslots on a same frequency.
3. The method for performing grant-free uplink transmissions of claim 1 , wherein the first grant-free resource block and the second grant-free resource block occur during different timeslots on different frequencies.
4. The method for performing grant-free uplink transmissions of claim 1 , wherein the first grant-free resource block and the second grant-free resource block occur during a same timeslot on different frequencies.
5. The method for performing grant-free uplink transmissions of claim 1 , wherein the first grant-free transmission comprises a third pointer to a third grant-free resource block.
6. The method for performing grant-free uplink transmissions of claim 5 , wherein the second grant-free transmission comprises a fourth pointer to a fourth grant-free resource block.
7. The method for performing the grant-free transmission of claim 1 , wherein the base station is part of a 5G New Radio (NR) cellular network.
8. The method for performing the grant-free transmission of claim 1 , wherein selecting the first grant-free resource block and selecting the second grant-free resource block is performed randomly by the first UE.
9. A system for performing grant-free uplink transmissions, the system comprising:
a plurality of user equipment (UE), wherein a first UE of the plurality of UE is configured to:
determine data that is to be transmitted using a grant-free uplink transmission to a base station of a cellular network;
select a first grant-free resource block, wherein:
a plurality of grant-free resource blocks define a plurality of subcarrier frequencies and a plurality of timeslots for data to be transmitted to the base station of the cellular network without a reservation by the first UE;
select a second grant-free resource block; and
transmit a first grant-free transmission that comprises a data payload and a first pointer at the first grant-free resource block, wherein:
the first pointer refers to the second grant-free resource block; and
transmit a second grant-free transmission that comprises the data payload and a second pointer at the second grant-free resource block, wherein:
the second pointer refers to the first grant-free resource block; and the cellular network comprising the base station, the base station configured to:
receive the first grant-free transmission transmitted by the first UE on the first grant-free resource block;
detect a collision on the second grant-free resource block, wherein the collision results from the second grant-free transmission being received during a same timeslot and a same frequency as a third grant-free transmission from a second UE distinct from the first UE; and
based on the first pointer of the first grant-free transmission, perform interference cancelation to subtract at least a portion of the first grant-free transmission from the received collision to reconstruct the third grant-free transmission transmitted by the second UE at the second grant-free resource block.
10. The system of claim 9 , wherein the first grant-free resource block and the second grant-free resource block occur during different timeslots on a same frequency.
11. The system of claim 9 , wherein the first grant-free resource block and the second grant-free resource block occur during different timeslots on different frequencies.
12. The system of claim 9 , wherein the first grant-free resource block and the second grant-free resource block occur during a same timeslot on different frequencies.
13. The system of claim 9 , wherein the first grant-free transmission comprises a third pointer to a third grant-free resource block.
14. The system of claim 13 , wherein the second grant-free transmission comprises a fourth pointer to a fourth grant-free resource block.
15. The system of claim 9 , wherein the cellular network is a 5G New Radio (NR) cellular network.
16. The system of claim 9 , wherein selecting the first grant-free resource block and selecting the second grant-free resource block is performed randomly by the first UE.
17. A non-transitory processor-readable medium for a cellular device comprising processor-readable instructions configured to cause one or more processors to:
determine data that is to be transmitted using a grant-free uplink transmission to a base station of a cellular network;
select a first grant-free resource block, wherein:
a plurality of grant-free resource blocks define a plurality of subcarrier frequencies and a plurality of timeslots for data to be transmitted to the base station of the cellular network without a reservation by the cellular device;
select a second grant-free resource block; and
cause a first grant-free transmission to be transmitted that comprises a data payload and a first pointer at the first grant-free resource block, wherein:
the first pointer refers to the second grant-free resource block; and
cause a second grant-free transmission to be transmitted that comprises the data payload and a second pointer at the second grant-free resource block, wherein:
the second pointer refers to the first grant-free resource block, wherein the base station is configured to:
receive the first grant-free transmission transmitted by the cellular device on the first grant-free resource block;
detect a collision on the second grant-free resource block, wherein the collision results from the second grant-free transmission being received during a same timeslot and a same frequency as a third grant-free transmission from a second cellular device distinct from the cellular device; and
based on the first pointer of the first grant-free transmission, perform interference cancelation to subtract at least a portion of the first grant-free transmission from the received collision to reconstruct the third grant-free transmission transmitted by the second cellular device at the second grant-free resource block.
18. The non-transitory processor-readable medium of claim 17 , wherein:
the first grant-free transmission comprises a third pointer to a third grant-free resource block; and
the second grant-free transmission comprises a fourth pointer to a fourth grant-free resource block.