Multicast Synchronization Signal Selection for Better UE Reception
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring optimal signal quality for multicast transmissions due to predefined synchronization signal block (SSB) reception, leading to poor reception quality at user equipment (UEs).
Innovation Solution
The system allows UEs to select an SSB with the highest signal quality for multicast transmission, using a corresponding SSB index to monitor downlink control channels during designated monitoring occasions, improving signal quality by associating multicast transmissions with CSI-RS and configuring non-overlapping search space sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs use predefined SSB reception for multicast transmissions, then the system structure is simple, but the signal quality and reception quality are poor
Solution Approach 1:
The patent makes the SSB reception dynamic by allowing UEs to select from multiple SSBs based on signal quality measurements. Instead of a fixed predefined reception mode, the system dynamically adapts to channel conditions by enabling UE to choose the best SSB index, thereby improving signal quality while managing complexity through standardized selection procedures.
Solution Approach 2:
The patent changes the SSB index parameter to improve signal quality. By associating different SSB indices with different beam directions or transmission configurations, the UE can select the SSB index that provides the best signal quality for multicast reception, transforming a static parameter into a selectable quality indicator.
2Measurement precision
If UEs monitor downlink control channel continuously, then multicast transmission scheduling is accurate, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring of the downlink control channel based on DRX cycles and monitoring occasions associated with the selected SSB index. Instead of continuous monitoring, UEs periodically wake up to check for multicast scheduling information, achieving accurate scheduling while significantly reducing power consumption through sleep-wake cycles.
Solution Approach 2:
The system enables UEs to self-manage their monitoring behavior by autonomously determining monitoring occasions based on their selected SSB index and configured DRX parameters. Each UE independently configures its monitoring schedule, reducing unnecessary power consumption while maintaining accurate reception of multicast scheduling information.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit one or more synchronization signal blocks (SSBs), each SSB including a system information block (SIB), to one or more user equipments (UEs). A UE of the one or more UEs may select an SSB with a corresponding SSB index for receiving a SIB and subsequently a multicast transmission from the base station. The multicast transmission may include transmitting a multicast control channel, a multicast traffic channel, or both. The SIB may include one or more parameters for receiving the multicast transmission. The UE may identify one or more monitoring occasions for monitoring a physical downlink control channel for scheduling the multicast transmission based on the SSB index. The UE may receive the multicast transmission in accordance with the one or more parameters from the physical downlink control channel during the one or more monitoring occasions.