Data transfer between an inactive mode user equipment and a wireless network
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided that improve data packet exchange between a UE in an inactive mode and a network. In certain configurations, the apparatus may receive, from a user equipment (UE) in an active mode, a first packet including a first identifier associated with an anchor base station, a second identifier associated with a UE context, and a payload. The apparatus may identify the anchor base station based at least in part on one or more of the first identifier associated with the anchor base station or the second identifier associated with the UE context. The apparatus may transmit a second packet to the anchor base station. The second packet may include at least a portion of the first packet.
1. A method of wireless communication at a network entity, comprising:
receiving, from a user equipment (UE) in radio resource control (RRC) inactive mode, a first packet including:
a first identifier identifying an anchor base station,
a second identifier identifying a UE context, and
a payload;
receiving, from the UE, an indication bit included in a medium access control (MAC) subheader of the first packet, the indication bit indicating that the UE supports inactive data transfer between the UE and the anchor base station;
identifying the anchor base station using at least in part on one or more of the first identifier or the second identifier; and
transmitting a second packet to the anchor base station using in part on the indication bit, the second packet including at least a portion of the first packet.
2. The method of claim 1 , wherein: the first packet includes a subheader, a service data unit (SDU), and a control element (CE) and wherein: the subheader includes the first identifier, the SDU includes the payload, and the CE includes the second identifier.
3. The method of claim 2 , wherein the first packet comprises a medium access control (MAC) protocol data unit (PDU) and the CE is a MAC CE.
4. The method of claim 2 , wherein the first packet comprises a packet data convergence protocol (PDCP) protocol data unit (PDU) and the CE is a PDCP CE.
5. The method of claim 1 , wherein: the first packet includes a first service data unit (SDU) including an RRC message, a first subheader, and a second SDU, and wherein: the RRC message includes the second identifier, the first subheader includes the first identifier, and the second SDU includes the payload.
6. The method of claim 5 , wherein: the first packet further includes a second subheader, and the second subheader includes a third identifier associated with the network entity.
7. The method of claim 5 , wherein the first SDU and the second SDU are multiplexed.
8. The method of claim 1 , wherein: the first packet includes a service data unit (SDU) including an RRC message, and the RRC message in the SDU includes: the first identifier, the second identifier, and the payload.
9. The method of claim 8 , wherein: the first packet further comprises a subheader, and the subheader includes a third identifier associated with the network entity.
10. The method of claim 1 , wherein the second identifier includes an inactive radio network temporary identifier (I-RNTI).
11. The method of claim 1 , wherein the second packet includes the first identifier and the payload.
12. The method of claim 1 , wherein the second packet includes: the first identifier, the second identifier, and the payload.
13. The method of claim 12 , wherein the second packet further includes a third identifier associated with the network entity.
14. The method of claim 1 , further comprising: receiving a third packet from the anchor base station, the third packet including: the first identifier, the second identifier, a downlink payload, and a third identifier associated with the network entity; and transmitting the third packet to the UE.
15. The method of claim 1 , wherein the first packet includes a radio link control (RLCI configuration.
16. The method of claim 15 , wherein the RLC configuration is configured by a radio area network (RAN).
17. The method of claim 15 , wherein the RLC configuration is preconfigured at the UE.
18. The method of claim 1 , wherein the network entity includes a serving base station.
19. An apparatus for wireless communication at a network entity, comprising:
at least one memory; and
at least one processor coupled to the at least one memory and configured to cause the network entity to:
receive, from a user equipment (UE), a first packet including:
a first identifier identifying an anchor base station,
a second identifier identifying a UE context, and
receive, from the UE, an indication bit included in a medium access control (MAC) subheader of the first packet, the indication bit indicating that the UE supports inactive data transfer between the UE and the anchor base station;
identify the anchor base station using at least in part on one or more of the first identifier or the second identifier; and
transmit a second packet to the anchor base station using in part on the indication bit, the second packet including at least a portion of the first packet.
20. The apparatus of claim 19 , wherein the second packet includes: the first identifier, the second identifier, and 5 the payload.
21. The apparatus of claim 20 , wherein the at least one processor is further configured to cause the network entity to: receive a third packet from the anchor base station, the third packet including: the first identifier, the second identifier, a downlink payload, and a third identifier associated with the network entity; and transmit the third packet to the UE.
22. The apparatus of claim 19 , wherein the network entity includes a serving base station.
23. The apparatus of claim 19 , wherein: the first packet includes a first service data unit (SDU) including an RRC message and a second SDU, and wherein: the RRC message includes the second identifier, and the second SDU includes the payload.
24. The apparatus of claim 23 , wherein: the first packet further includes a second subheader, and the second subheader includes a third identifier associated with the network entity.
25. The apparatus of claim 23 , wherein the first SDU and the second SDU are multiplexed.
26. The apparatus of claim 19 , wherein: the first packet includes a service data unit (SDU) including an RRC message, and the RRC message in the SDU includes: the first identifier, the second identifier, and the payload.
27. The apparatus of claim 26 , wherein: the first packet further comprises a subheader, and the subheader includes a third identifier associated with the network entity.
28. The apparatus of claim 19 , wherein the second identifier includes an inactive radio network temporary identifier (I-RNTI).
29. The apparatus of claim 19 , wherein the second packet includes the first identifier and the payload.
30. The apparatus of claim 19 , wherein the first packet includes a radio link control (RLCI configuration.