UE Paging Trigger via Broadcast Channel
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Solution Overview
Problem
In the LTE system, user equipment (UE) in idle mode wastes power by continuously listening to the physical downlink control channel (PDCCH) and physical downlink shared channel (PDSCH) for paging messages, even when no messages are present, due to the lack of efficient triggering mechanisms.
Innovation Solution
A method is introduced where a UE and a base station establish a correspondence between a time-frequency resource and a trigger message on a broadcast channel, allowing the base station to send a trigger message to the UE, which then monitors the paging message only when necessary, reducing unnecessary listening and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously listens to PDCCH/PDSCH for paging messages, then the UE can receive paging messages in time, but the power consumption increases
Solution Approach 1:
The base station performs preliminary action by sending a trigger message on the broadcast channel before the actual paging message is transmitted. The UE monitors this trigger message at a predetermined time-frequency resource, and only activates full paging message monitoring when the trigger is detected. This preliminary triggering mechanism allows the UE to remain in a low-power state most of the time while still being able to receive paging messages reliably when needed.
2Reliability
If the UE monitors PDCCH/PDSCH on the whole downlink bandwidth, then the UE can detect paging messages, but power is wasted when no paging messages are sent
Solution Approach 1:
The paging monitoring process is segmented into two distinct stages: (1) monitoring a trigger message on the broadcast channel at a specific time-frequency resource, and (2) if triggered, monitoring the actual paging message on PDCCH/PDSCH. This segmentation allows the UE to perform minimal monitoring most of the time and only engages in full paging message monitoring when the trigger condition is met, thereby eliminating wasted power consumption during periods when no paging messages are being sent.
3Measurement precision
If the UE listens to PDCCH/PDSCH at calculated time instances, then the UE can synchronize with network paging occasions, but unnecessary power is consumed when no messages are present
Solution Approach 1:
The system uses preliminary action by having the base station send a trigger message at the calculated paging occasion time instances. The UE maintains precise timing synchronization by monitoring this lightweight trigger message at the predetermined time-frequency resource corresponding to its calculated paging occasion. This approach preserves the precise timing synchronization needed for network coordination while dramatically reducing power consumption compared to continuously monitoring full PDCCH/PDSCH at these time instances.
Data Source
AI summary
Methods for triggering a user equipment (UE) to monitor a paging message, user equipments, base stations, and storage medium are provided. A method for triggering a user equipment (UE) to monitor a paging message, carried out in the UE, the method comprising: acquiring a correspondence between the UE and a time-frequency resource, where a trigger message for the UE locates, of a broadcast channel; receiving the trigger message from a base station via a time-frequency resource of a broadcast channel according to the correspondence; and triggering monitoring of the paging message for the UE.