Grant-less uplink transmission for new radio
Current approaches to transmitting uplink data in a network often require resources to be granted. In an example, a node or apparatus may configure a plurality of devices to operate in a grant-less mode in accordance with a respective grant-less access allocation, such that, when the plurality of devices transmit messages uplink in the network, the messages are transmitted using frequency resources defined by the respective grant-less access allocation, and the plurality of devices transmit the messages without being granted access to transmit the messages, so as to operate in the grant-less mode.
1. An apparatus comprising a processor, a memory, and communication circuitry, the apparatus being connected to an access network via its communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform operations comprising:
receiving a grant-less configuration that includes a first grant-less access allocation and/or a second grant-less access allocation, the first and second grant-less access allocations defining first and second time and frequency resources, respectively;
transmitting a message uplink in the access network using the first time and frequency resources defined by the first grant-less access allocation, so as to make a grant-less transmission in accordance with the grant-less configuration;
when a transmission redundancy value is greater than one, transmitting the message again uplink to the access network using the first and/or second time and frequency resources defined by the first and/or second grant-less access allocation, respectively.
2. The apparatus as recited in claim 1 , wherein the first and second grant-less configurations are received via a static configuration carried on dedicated Radio Resource Control message sent to the apparatus.
3. The apparatus as recited in claim 1 , the first and second grant-less access allocations are received via a dynamic indication carried on a downlink control channel from the access network.
4. The apparatus as recited in claim 3 , wherein an activation indication and a deactivation indication are also received on the downlink control channel from the access network.
5. The apparatus as recited in claim 3 , wherein the downlink control channel is a dedicated control channel.
6. The apparatus as recited in claim 3 , wherein the downlink control channel is scrambled with a grant-less identifier.
7. The apparatus as recited in claim 6 , wherein the grant-less identifier is from the access network.
8. The apparatus as recited in claim 1 , wherein the first and second grant-less allocations comprise a respective time interval during which a specific access allocation scheme is applied.
9. The apparatus as recited in claim 8 , wherein the time intervals each comprise one or more respective contention spaces available for selection for a grant-less transmission.
10. The apparatus as recited in claim 1 , wherein the grant-less configuration further comprises the transmission redundancy value and a redundancy version associated with the transmission redundancy value.
11. The apparatus as recited in claim 1 , wherein the grant-less configuration further comprises a modulation and coding scheme, and/or a frequency hopping scheme.
12. The apparatus as recited in claim 1 , the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform further operations comprising:
transmitting an uplink grant-less transmission that includes a front-load reference signal that is allocated at a first symbol of the uplink grant-less transmission.
13. The apparatus as recited in claim 12 , wherein the front-load reference signal further comprises a grant-less identifier.
14. An apparatus comprising a processor, memory, and communication circuitry, the apparatus being connected to a user equipment via its communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform operations comprising:
sending a grant-less configuration that includes a first grant-less access allocation and/or a second grant-less allocation, the first and second grant-less access allocation defining first and second time and frequency resources, respectively;
receiving a message uplink from a user equipment at the first time and frequency resources defined by the first grant-less access allocation; and
when a transmission redundancy value is greater than one, receiving the message again at the first and/or second time and frequency resources.
15. The apparatus as recited in claim 14 , wherein the grant-less configuration is sent on a dedicated Radio Resource Control channel to the user equipment.
16. The apparatus as recited in claim 14 , wherein first and second grant-less access allocations are sent on one or more downlink control channels to the user equipment.
17. The apparatus as recited in claim 16 , wherein the first and second grant-less access allocations are activated and/or deactivated on the one or more downlink control channels.
18. The apparatus as recited in claim 17 , the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform further operations comprising:
sending a grant-less identifier, such that the downlink control channel is scrambled with the grant-less identifier.
19. A method performed by a user equipment (UE) for grant-less transmission to an access network, the method comprising:
receiving a grant-less configuration that includes a first grant-less access allocation and/or a second grant-less allocation, the first and second grant-less access allocations defining first and second time and frequency resources, respectively;
transmitting a message uplink to the access network using the first time and frequency resources defined by the first grant-less access allocation, so as to make a grant-less transmission in accordance with the grant-less configuration; and
when a transmission redundancy value is greater than one, transmitting the message again uplink to the access network using the first and/or second time and frequency resources defined by the first and/or second grant-less access allocations, respectively.