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. A wireless/transmit receive unit (WTRU) comprising:
a receiver configured to receive a grant-less configuration indicating a first grant-less access allocation and a second grant-less access allocation, the first grant-less access allocation comprising first time and frequency resources and the second grant-less access allocation comprising second time and frequency resources;
a transmitter configured to:
transmit uplink (UL) data, via an UL channel, using the first time and frequency resources; and
when transmission redundancy information is greater than one, retransmit the UL data using the second time and frequency resources.
2. The WTRU of claim 1 , wherein the grant-less configuration is received via a semi-static configuration in an Radio Resource Control message.
3. The WTRU of claim 1 , wherein the grant-less configuration is indicated via a downlink control channel from an access network.
4. The WTRU of claim 3 , wherein an activation indication and a deactivation indication are received from the access network.
5. The WTRU of claim 3 , wherein the downlink control channel is scrambled with an identifier.
6. The WTRU of claim 5 , wherein the identifier is from the access network.
7. The WTRU of claim 1 , wherein the first grant-less access allocation is applied during a first time interval and the second grant-less access allocation is applied during a second time interval.
8. The WTRU of claim 1 , wherein the grant-less configuration further indicates the transmission redundancy information and a redundancy version associated with the transmission redundancy information.
9. The WTRU of claim 1 , wherein the grant-less configuration further indicates at least one of a modulation and coding scheme or a frequency hopping scheme.
10. The WTRU of claim 1 , the transmitted UL data includes a front-load reference signal that is allocated at a first symbol of the transmission.
11. The WTRU of claim 10 , wherein the front-load reference signal further comprises an identifier.
12. The WTRU of claim 1 , wherein the first time and frequency resources and the second time and frequency resources are the same.
13. A method for use in a wireless/transmit receive unit (WTRU), the method comprising:
receiving a grant-less configuration indicating a first grant-less access allocation and a second grant-less access allocation, the first grant-less access allocation comprising first time and frequency resources and the second grant-less access allocation comprising second time and frequency resources;
transmitting uplink (UL) data, via an uplink channel, using the first time and frequency resources; and
when transmission redundancy information is greater than one, retransmitting the UL data using the second time and frequency resources.
14. The method of claim 13 , wherein the grant-less configuration is received via a semi-static configuration in an Radio Resource Control message.
15. The method of claim 13 , wherein the grant-less configuration is indicated via a downlink control channel from an access network.
16. The method of claim 15 , wherein an activation indication and a deactivation indication are received from the access network.
17. The method of claim 13 , wherein the first grant-less access allocation is applied during a first time interval and the second grant-less access allocation is applied during a second time interval.
18. The method of claim 13 , wherein the first time and frequency resources and the second time and frequency resources are the same.