UE Multicast Reception Quality Trigger for RRC State Switching
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Solution Overview
Problem
Existing 5G/NR multicast and broadcast services face challenges in maintaining high-quality multicast reception while minimizing network and power consumption in user equipment (UE) transitioning to RRC idle or inactive states.
Innovation Solution
A communication method and user equipment (UE) that dynamically adjusts the radio resource control (RRC) state based on reception quality thresholds, allowing UEs to transition to RRC connected state when multicast reception quality deteriorates, ensuring high QoS while reducing network load and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits a new uplink data packet before the HARQ-ACK feedback for the previous packet is received, then the uplink transmission continuity is improved, but the HARQ-ACK feedback may be missed or transmitted incorrectly
Solution Approach 1:
The patent dynamically adjusts the uplink transmission timing based on the reception status of HARQ-ACK feedback. When HARQ-ACK is not received or indicates NACK, the UE delays transmission of subsequent packets until the feedback is received, ensuring reliable acknowledgment while maintaining transmission continuity when feedback is positive.
Solution Approach 2:
The patent implements a feedback-driven transmission control mechanism where the UE monitors HARQ-ACK feedback from the network and adjusts its uplink transmission behavior accordingly. The feedback information directly influences whether the UE can proceed with new transmissions or must wait, creating a closed-loop control system that balances continuity and reliability.
2Reliability
If the UE waits for HARQ-ACK feedback before transmitting new uplink data packets, then the HARQ-ACK feedback accuracy is improved, but the uplink transmission efficiency deteriorates
Solution Approach 1:
The waiting behavior is made dynamic rather than static. The UE adaptively decides whether to wait based on the actual HARQ-ACK feedback received, the timing relationships between packets, and network conditions. This dynamic adjustment optimizes the balance between reliability and efficiency for each specific transmission scenario.
Solution Approach 2:
The patent performs preliminary checks and preparations before actual data transmission, including monitoring for HARQ-ACK feedback and pre-calculating timing relationships. By preparing in advance and having clear decision criteria ready, the UE can make rapid transmission decisions without excessive waiting, improving overall efficiency while maintaining reliability.
3Device complexity
If the UE determines the end of the first uplink data packet based on the length indication, then the packet boundary detection is simplified, but the accuracy may be insufficient when the indicated length exceeds the actual packet length
Solution Approach 1:
The patent uses feedback from the network regarding packet reception status to verify and correct packet boundary detection. When the indicated length exceeds actual packet length or when packets are concatenated, the HARQ-ACK feedback mechanism provides information that helps the UE accurately determine packet boundaries by comparing expected vs. actual transmission patterns.
Solution Approach 2:
The patent allows for partial overlap between the indicated packet length and actual packet content. By permitting the length indication to extend beyond or fall short of the actual packet boundary, the system gains flexibility in handling variable-length packets and concatenated transmissions, with the true boundary determined through feedback and timing analysis rather than relying solely on the length field.
Data Source
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AI summary
A communication method performed by a UE 100 in a mobile communication system for providing a Multicast Broadcast Service (MBS) includes: receiving, in an RRC idle state or an RRC inactive state, a multicast session from a network; measuring, in a multicast reception state in which the multicast session is being received, reception quality from the network; and performing processing of transitioning to an RRC connected state for multicast reception in response to the measured reception quality being lower than a threshold value.