DRX Control for MBS Retransmissions Using Segmented Timers
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Solution Overview
Problem
The implementation of Discontinuous Reception (DRX) for Multicast and Broadcast Services (MBS) in wireless communication systems is complex, particularly when handling retransmissions using different transmission methods such as Point-to-Point (PTP) and Point-to-Multipoint (PTM), leading to confusion and unnecessary complexity due to the mixing of control mechanisms.
Innovation Solution
A method that involves using specific timers and RNTIs (Radio Network Temporary Identifiers) to independently manage DRX for PTP and PTM retransmissions, allowing for separate control mechanisms that avoid interference and simplify the system design by clearly distinguishing between different types of transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate DRX control mechanisms are used for PTP and PTM transmissions, then clarity and ease of operation are improved, but device complexity increases due to managing multiple timers and control mechanisms
Solution Approach 1:
The patent segments the DRX control mechanism by introducing separate timers for PTP and PTM transmissions. Specifically, it uses a first timer (drx-HARQ-RTT-TimerDL) for PTP retransmissions and a second timer (drx-HARQ-RTT-TimerDLPTM) for PTM retransmissions. This segmentation allows independent control of DRX parameters for each transmission type, resolving the contradiction by improving operational clarity through dedicated timers while managing complexity through systematic organization of these timers based on transmission type.
2Device complexity
If unified DRX control mechanism is used for both PTP and PTM, then device complexity is reduced, but reliability deteriorates due to mixing control mechanisms and potential interference
Solution Approach 1:
The patent applies segmentation by introducing distinct timer mechanisms for PTP and PTM transmissions. The first timer controls DRX behavior for PTP retransmissions while the second timer controls DRX behavior for PTM retransmissions. This segmentation ensures that each transmission type has its own dedicated control mechanism, preventing interference between them and ensuring reliable handling of retransmissions according to their specific requirements.
Solution Approach 2:
The patent applies local quality by configuring different DRX parameters and timer values according to the specific requirements of each transmission type. PTP transmissions can have optimized DRX settings for unicast characteristics, while PTM transmissions can have optimized settings for multicast/broadcast characteristics. This localized optimization ensures each transmission type achieves its best performance without compromising the other.
3Use of energy by moving object
If DRX is implemented for MBS service, then power consumption is reduced, but productivity decreases due to longer sleep cycles and potential data loss
Solution Approach 1:
The patent applies dynamics by making the terminal's reception behavior adaptive based on the transmission type. During active periods, the terminal monitors for both PTP and PTM transmissions with appropriate timers running. During sleep periods, the terminal can power down receivers more aggressively for PTM while maintaining readiness for PTP retransmissions. This dynamic adjustment of reception behavior based on transmission type and timer state optimizes the balance between power saving and data reception efficiency.
Solution Approach 2:
The patent implements periodic action through the DRX mechanism itself, where the terminal alternates between active monitoring periods and sleep periods. The separate timers for PTP and PTM ensure that the terminal wakes up at appropriate intervals to check for retransmissions of each type, maintaining productivity by catching periodic retransmission opportunities while maximizing power savings during sleep intervals.
Data Source
AI summary
The present application discloses a method and device for wireless communications, comprises receiving a first signaling, a second RNTI being used to generate a scrambling code of the first signaling, the first signaling being used to indicate a first time-frequency resource; receiving a first signal on the first time-frequency resource; a first bit block being used to generate the first signal; the first signaling indicating a new transmission; the first signaling indicating that a HARQ process number of the first signal is a first HARQ process number; the second RNTI being used to generate a scrambling code of the first signal; the method proposed in the present application can realize a DRX in a Point to Multipoint (PTM) transmission.