Preconfigured uplink resource techniques in wireless communications
Methods, systems, and devices for wireless communications are described. that support preconfigured uplink resources (PUR) in wireless communications. A base station may communicate that support for PUR is available, and may allocate PUR resources to a user equipment (UE) based on requests from the UE. The UE may receive an indication that the base station supports PUR, such as via a system information block (SIB), determine to request PUR, and transmit a PUR request message to the base station. A PUR response from the base station may indicate configuration, or reconfiguration of PUR allocation for the UE that may be used for uplink transmissions, or release of the PUR allocation.
1. A user equipment (UE), comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:
transmit a preconfigured uplink resource (PUR) request message to an access network entity based at least in part on determining that the access network entity supports preconfigured uplink resources, wherein the PUR request message includes a number of instances of PUR grants requested by the UE;
receive a message from the access network entity indicating a PUR configuration or reconfiguration or release of PURs;
determine, based at least in part on the message from the access network entity, a set of control channel resources to monitor for an uplink grant; and
monitor the set of control channel resources for the uplink grant.
2. The UE of claim 1 , wherein the number of instances of PUR grants provides an explicit number of PUR grants or an indication of an infinite number of PUR grants.
3. The UE of claim 1 , wherein the number of instances of PUR grants requested by the UE indicate a one-shot PUR configuration is requested or a multi-shot PUR configuration is requested.
4. The UE of claim 1 , wherein the PUR configuration is provided as a delta configuration that indicates differences over a prior PUR configuration of the UE.
5. The UE of claim 1 , wherein the PUR configuration is provided as a delta configuration that indicates differences over a default PUR configuration or that indicates differences over a configuration being used at the UE.
6. The UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
transmit, after receiving the PUR configuration, a PUR reconfiguration failure indication to the access network entity; and
release the PUR configuration.
7. The UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
determine that the PUR configuration is de-configured based at least in part on receiving a broadcast system information transmission from the access network entity that indicates PUR is unsupported; and
release the PUR configuration.
8. The UE of claim 1 , wherein the PUR request message is transmitted to the access network entity in an uplink message of an early data transmission (EDT) procedure.
9. The UE of claim 8 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
format the PUR request message to be transmitted in the uplink message of the EDT procedure, wherein the PUR request message indicates a requested configuration, reconfiguration, or release of the PUR configuration.
10. The UE of claim 8 , wherein the PUR request message is transmitted in a message three (MSG3) transmission of the EDT procedure.
11. The UE of claim 1 , wherein the message from the access network entity indicating configuration or reconfiguration or release of PURs of the UE is received in an early data transmission (EDT) downlink message 4 that provides a radio resource control (RRC) connection release message or an RRC early data complete message.
12. The UE of claim 1 , wherein the message from the access network entity explicitly or implicitly provides one or more of an indication that the UE is to use a prior PUR configuration, a confirmation of the prior PUR configuration, an indication to de-configure and release the prior PUR configuration, a new resource for a new PUR configuration, or any combinations thereof.
13. A user equipment (UE), comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:
transmit a preconfigured uplink resource (PUR) request message to an access network entity based at least in part on determining that the access network entity supports preconfigured uplink resources, wherein the PUR request message includes a number of instances of PUR grants requested by the UE;
receive a message from the access network entity indicating a PUR configuration or PUR reconfiguration or PUR release;
determine that the PUR configuration is de-configured based at least in part on a broadcast system information transmission that indicates PUR is unsupported; and
release the PUR configuration.
14. The UE of claim 13 , wherein the number of instances of PUR grants provides an explicit number of PUR grants or an indication of an infinite number of PUR grants.
15. The UE of claim 13 , wherein the number of instances of PUR grants requested by the UE indicate a one-shot PUR configuration is requested or a multi-shot PUR configuration is requested.
16. The UE of claim 13 , wherein the PUR configuration is provided as a delta configuration that indicates differences over a prior PUR configuration of the UE.
17. The UE of claim 13 , wherein the PUR configuration is provided as a delta configuration that indicates differences over a default PUR configuration or that indicates differences over a configuration being used at the UE.
18. The UE of claim 13 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
transmit, after receiving the PUR configuration, a PUR reconfiguration failure indication to the access network entity; and
release the PUR configuration.
19. The UE of claim 13 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
receive the broadcast system information transmission from the access network entity that indicates the PUR is unsupported, wherein the release of the PUR configuration is based at least in part on the received broadcast system information transmission.
20. The UE of claim 13 , wherein the PUR request message is transmitted to the access network entity in an uplink message of an early data transmission (EDT) procedure.