NR Multicast Beamforming Adaptation for Concurrent Unicast Interference
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently managing and adapting multicast beamforming to support multiple UEs with varying channel characteristics, leading to interference and suboptimal performance in multicast and unicast transmissions.
Innovation Solution
The system enhances multicast beamforming by allowing UEs to measure and report channel characteristics, enabling the base station to dynamically adjust beams for PTM and PTP configurations, mitigate interference, and support concurrent multicast and unicast services through techniques like joint performance consideration and beam failure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits a common beam to multiple UEs for multicast service, then the link budget is improved and antenna gain is increased, but interference between different UEs and between multicast and unicast transmissions increases
Solution Approach 1:
The patent segments the beamforming management by introducing separate control mechanisms for multicast beams and unicast beams. The base station maintains separate beam management procedures, allowing multicast beams to be optimized for multiple UEs while unicast beams are optimized for individual UEs, thereby reducing interference between different transmission types.
Solution Approach 2:
The patent implements dynamic beam switching and adaptation where the base station can dynamically select which beam to use based on current channel conditions and UE requirements. The system can switch between multicast and unicast beam modes, adjust beam directions and shapes in real-time to minimize interference while maintaining link quality.
2Productivity
If the base station uses beamforming to provide PTM multicast service, then the common beam is transmitted to multiple UEs simultaneously, but the base station cannot balance different capabilities of UEs with different downlink channel characteristics
Solution Approach 1:
The patent enables dynamic adaptation where the base station can switch between PTM (point-to-multipoint) and PTP (point-to-point) transmission modes based on UE capabilities and channel conditions. The system dynamically adjusts the beamforming configuration to balance the capabilities of different UEs, allowing flexible service delivery that adapts to individual UE requirements while maintaining multicast efficiency.
Solution Approach 2:
The patent changes transmission parameters such as beam direction, beam width, and transmission mode (PTM/PTP) based on measured channel characteristics and UE capabilities. The base station adjusts these parameters to optimize the balance between serving multiple UEs efficiently and accommodating individual UE requirements.
3Measurement precision
If the base station transmits reference signals on candidate beams for UE to estimate downlink channel quality, then more accurate channel characterization is obtained, but the complexity of beam management and measurement increases
Solution Approach 1:
The patent makes reference signals serve multiple functions: they are used for channel quality estimation, beam selection, and beam failure detection. By making the reference signal infrastructure multi-functional, the system reduces the need for separate measurement mechanisms, thereby lowering overall system complexity while maintaining measurement precision.
Solution Approach 2:
The patent implements feedback mechanisms where UEs report measured channel characteristics back to the base station. This feedback loop enables the base station to adapt beamforming parameters based on actual UE experiences, reducing the complexity of manual beam management by automating the optimization process through data-driven decisions.
4Adaptability or versatility
If the base station supports concurrent multicast and unicast services, then service flexibility is improved, but interference management and resource allocation become more complex
Solution Approach 1:
The patent segments the resource allocation and beam management for multicast and unicast services. The base station maintains separate control mechanisms for assigning time-frequency resources and selecting beams for each service type, enabling flexible concurrent operation while simplifying interference management through structured separation of control functions.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can dynamically assign time slots, frequency resources, and beam configurations based on current service requirements. This dynamic approach allows flexible support for concurrent multicast and unicast services while managing interference through real-time adaptation rather than static allocation.
Data Source
AI summary
Methods and systems are disclosed for enhancements to multicast beamforming to support PTM multicast service, concurrent multicast and unicast service, MBS, or group side-link service at the physical layer. A base station or multicast UEs of a wireless communication network may enhance the management and adaptation of downlink multicast beams used to provide the service. Enhancements to multicast beamforming may include techniques such as joint consideration of multicast and unicast performance of UEs receiving concurrent multicast and unicast physical downlink traffic when selecting multicast beamforming, multicast beamforming to reduce interference of the multicast transmission on unicast UEs receiving unicast service, support for PTM or PTP multicast transmission at the physical layer to accommodate UE preferences for PTM/PTP in multicast beam failure detection and recovery process. The enhancements improve multicast service performance, flexibly accommodate the provisioning of simultaneous multicast and unicast services, and enhance multicast beam failure detection and recovery process.