Mobile-terminated downlink data transmission and subsequent mobile-originated uplink data transmission without entering connected mode

A method of wireless communication performed by a user equipment (UE), comprising:

• transmitting mobile-originated uplink data in a first message of a random access channel (RACH) procedure while the UE is in an inactive mode;
• receiving, while remaining in the inactive mode, a radio resource control (RRC) release message, the RRC release message including information related to a UE-specific search space (USS) that the UE is to monitor for mobile-terminated downlink data transmitted in response to the mobile-originated uplink data;
• and
• monitoring the USS for the mobile-terminated downlink data for a configured time period while remaining in the inactive mode.

A method of wireless communication performed by a base station, comprising:

• configuring a user equipment (UE) with a duration for a timer to be used during a random access channel (RACH) procedure, wherein the duration comprises an extended duration for a T319 timer;
• receiving, from the UE, a first message of the RACH procedure including mobile-originated uplink data, the first message corresponding to Message A in a two-step RACH procedure or Message 3 in a four-step RACH procedure;
• receiving, from an anchor base station in communication with one or more core network devices, mobile-terminated downlink data in response to the mobile-originated uplink data;
• and
• transmitting, to the UE, the mobile-terminated downlink data in a second message of the RACH procedure prior to expiration of the timer, wherein the second message includes information related to a UE-specific search space (USS) that the UE is to monitor for mobile-terminated downlink data transmitted in response to the mobile-originated uplink data.

An apparatus for wireless communication at 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 cause the UE to:
• transmit mobile-originated uplink data in a first message of a random access channel (RACH) procedure while the UE is in an inactive mode;
• receive, while remaining in the inactive mode, a radio resource control (RRC) release message, the RRC release message including information related to a UE-specific search space (USS) that the UE is to monitor for mobile-terminated downlink data transmitted in response to the mobile-originated uplink data;
• and
• monitor the USS for the mobile-terminated downlink data for a configured time period while remaining in the inactive mode.

An apparatus for wireless communication at 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 cause the UE to:
• receive radio resource control (RRC) signaling indicating a duration for a timer to be used during a random access channel (RACH) procedure in which the UE transmits mobile-originated uplink data;
• transmit, while in an inactive mode, a first message of the RACH procedure including the mobile-originated uplink data, the first message corresponding to Message A in a two-step RACH procedure or Message 3 in a four-step RACH procedure;
• start, while in the inactive mode, the timer based at least in part on transmitting the first message;
• and
• monitor, while in the inactive mode and for the duration of the timer indicated in the RRC signaling, to detect a second message of the RACH procedure comprising an RRC release message, wherein the RRC release message includes information related to a UE-specific search space (USS) that the UE is to monitor for mobile-terminated downlink data transmitted in response to the mobile-originated uplink data.