Base Station Downlink Signaling Delivery for Mobile UEs
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in efficiently delivering downlink signaling to user equipment (UE) that has mobility and is in an RRC_IDLE or RRC_INACTIVE state, as existing methods struggle to effectively route signaling from the upper layer entity to the correct base station when the UE moves between coverage areas.
Innovation Solution
A method where a first base station receives downlink signaling from an upper layer entity, requests paging from a second base station, and delivers the signaling to the UE via the second base station if a paging response is received, utilizing interfaces like X2 or NG4 to ensure seamless mobility and efficient data delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UE is in RRC_IDLE or RRC_INACTIVE state with mobility, then the UE can save power and reduce network complexity, but the base station cannot efficiently deliver downlink signaling to the moving UE
Solution Approach 1:
The patent introduces a serving base station as an intermediary between the upper layer entity and the target base station. The serving base station receives downlink signaling from the upper layer entity, buffers it, and forwards it to the target base station via X2 or NG4 interface when paging response indicates UE is at target base station. This mediator approach enables reliable signaling delivery to mobile UEs in idle/inactive states without requiring continuous connection.
2Adaptability or versatility
If the UE responds to paging from a different base station, then mobility is supported, but the original base station cannot directly deliver signaling to the UE
Solution Approach 1:
The serving base station acts as an intermediary that coordinates signaling delivery across base station boundaries. It receives paging responses from target base stations and uses them to determine where to forward downlink signaling, enabling seamless mobility without complex direct routing between upper layer entities and multiple base stations.
Solution Approach 2:
The serving base station performs preliminary buffering of downlink signaling received from the upper layer entity before the UE responds to paging. This preliminary action ensures signaling is ready for immediate delivery once the UE's location is confirmed through paging response, reducing delivery latency while supporting mobility.
3Reliability
If downlink signaling is buffered at the first base station, then signaling can be delivered to the correct base station, but signaling delivery is delayed
Solution Approach 1:
The serving base station performs preliminary buffering of downlink signaling upon receipt from the upper layer entity, preparing it for immediate forward 传输 once the UE's current base station is identified through paging response. This preliminary action ensures signaling readiness while enabling rapid delivery after location confirmation.
Solution Approach 2:
The system uses paging response as feedback to determine the UE's current base station location. The serving base station monitors paging responses and uses this feedback information to trigger timely forwarding of buffered signaling to the correct target base station, minimizing delivery delay while ensuring accuracy.
Data Source
AI summary
Provided are a method of delivering downlink signaling and a device supporting the method. According to one embodiment of the present invention, a method in which a first base station (BS) delivers downlink signaling to a user equipment (UE) in a wireless communication system includes: receiving the downlink signaling from an upper layer entity; requesting a second BS for paging on the UE; and delivering the downlink signaling to the UE via the second BS if a paging response of the UE is received from the second BS.