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 . An apparatus for wireless communication at an access network entity, comprising:
one or more processors,
one or more memories coupled with the one or more processors; and
one or more processor-readable instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
transmit an indication that the access network entity supports preconfigured uplink resource (PURs) associated with grant-free uplink transmissions;
receive a PUR request message, wherein the PUR request message includes a number of instances of PUR grants from a user equipment (UE); and
transmit a PUR configuration responsive to the PUR request message, wherein the PUR configuration comprises a set of control channel resources for an uplink grant associated with the UE.
2 . The apparatus 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 apparatus of claim 1 , wherein the number of instances of PUR grants from the UE indicate a one-shot PUR configuration is requested or a multi-shot PUR configuration is requested.
4 . The apparatus of claim 1 , wherein the PUR configuration is a prior PUR configuration of the UE.
5 . The apparatus of claim 1 , wherein the PUR configuration is a default PUR configuration.
6 . The apparatus of claim 1 , wherein the one or more processor-readable instructions stored in the one or more memories are further executable by the one or more processors to cause the apparatus to:
receive, based on transmitting the PUR configuration, a PUR reconfiguration failure indication.
7 . The apparatus of claim 1 , wherein the one or more processor-readable instructions stored in the one or more memories are further executable by the one or more processors to cause the apparatus to:
transmit an indication of a delta configuration that indicates at least one difference over a configuration of the UE.
8 . The apparatus of claim 1 , wherein the one or more processor-readable instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to receive the PUR request message are further executable by the one or more processors to cause the apparatus to:
receive the PUR request message in an uplink message of an early data transmission procedure.
9 . The apparatus of claim 8 , wherein the PUR request message is formatted for reception in the uplink message of the early data transmission procedure, and wherein the PUR request message indicates a requested PUR configuration or release of the PUR configuration.
10 . The apparatus of claim 8 , wherein the one or more processor-readable instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to receive the PUR request message are further executable by the one or more processors to cause the apparatus to:
receive the PUR request message in a message three (MSG3) transmission of the early data transmission procedure.
11 . The apparatus of claim 1 , wherein the one or more processor-readable instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to transmit the PUR configuration are further executable by the one or more processors to cause the apparatus to:
transmit the PUR configuration in an early data transmission downlink message (MSG4) that provides a radio resource control connection release message or a radio resource control early data complete message.
12 . The apparatus of claim 1 , wherein the PUR configuration explicitly or implicitly provides one or more of an indication to de-configure and release a prior or default PUR configuration, a new resource associated with a new PUR configuration to use as the PUR configuration, or any combination thereof.
13 . The apparatus of claim 1 , wherein the number of instances being zero indicates the PUR configuration is to be released.
14 . An apparatus for wireless communication at an access network entity, comprising:
one or more processors,
one or more memories coupled with the one or more processors; and
one or more processor-readable instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
transmit an indication that the access network entity supports preconfigured uplink resources (PURs) associated with grant-free uplink transmissions;
receive a PUR request message, wherein the PUR request message includes a number of instances of PUR grants from a user equipment (UE);
transmit a PUR configuration responsive to the PUR request message, wherein the PUR configuration comprises a set of control channel resources for an uplink grant associated with the UE; and
broadcast a system information transmission that indicates PUR is unsupported.
15 . The apparatus of claim 14 , 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.
16 . A method for wireless communication at an access network entity, comprising:
transmitting an indication that the access network entity supports preconfigured uplink resources (PURs) associated with grant-free uplink transmissions;
receiving a PUR request message, wherein the PUR request message includes a number of instances of PUR grants from a user equipment (UE); and
transmitting a PUR configuration responsive to the PUR request message, wherein the PUR configuration comprises a set of control channel resources for an uplink grant associated with the UE.
17 . The method of claim 16 , 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.
18 . The method of claim 16 , wherein the number of instances being zero indicates the PUR configuration is to be released.
19 . The method of claim 16 , wherein the number of instances of PUR grants from the UE indicate a one-shot PUR configuration is requested or a multi-shot PUR configuration is requested.
20 . The method of claim 16 , wherein the PUR configuration is a prior PUR configuration of the UE or a default PUR configuration.