Channel-Aware Unicast–Multicast Switching for Edge Reception
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Solution Overview
Problem
The low transmission efficiency of multicast communication in mobile multimedia services, particularly due to the exponential relationship between wireless signal strength attenuation and distance, leading to significantly reduced spectral efficiency for user equipment with poor signal quality.
Innovation Solution
A communication method that dynamically adjusts between unicast and multicast transmission modes based on user equipment status, using hybrid automatic repeat request (HARQ), dynamic scheduling, and adaptive modulation and coding (AMC) to optimize data delivery, and employs flexible grouping and beamforming to improve spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MBMS system sets a corresponding modulation and coding scheme using user equipment with the worst signal quality as a reference, then all user equipments in the multicast group can successfully receive multicast service data, but spectral efficiency of user equipment with relatively poor signal quality becomes five to dozens of times less than average spectral efficiency
Solution Approach 1:
The patent divides the multicast group into multiple subgroups based on channel quality, with each subgroup receiving data through dedicated transmission resources. This segmentation allows each subgroup to be optimized independently, preventing poor-quality users from dragging down overall spectral efficiency while ensuring all users can receive data reliably.
Solution Approach 2:
The patent applies different modulation and coding schemes tailored to specific user groups rather than using a uniform scheme for all users. Users with better channel quality receive higher-order modulation schemes while users with poorer quality receive more robust schemes, optimizing spectral efficiency for each local group while maintaining overall reliability.
2Device complexity
If a single modulation and coding scheme is used for all user equipments in the multicast group, then resource allocation is simplified, but user equipments with poor signal quality cannot successfully receive multicast service data
Solution Approach 1:
The patent segments users into multiple groups based on channel quality metrics, allowing differentiated resource allocation strategies for each group. This segmentation maintains manageable complexity by using clear grouping criteria while enabling reliable data reception for all users through group-specific optimization.
Solution Approach 2:
The patent dynamically adjusts modulation and coding scheme parameters based on user equipment channel quality conditions. By changing these parameters according to actual channel states, the system ensures reliable data reception for users with poor signal quality while maintaining efficient resource allocation through automated parameter selection.
3Productivity
If transmission parameters are optimized for average spectral efficiency, then overall resource utilization improves, but user equipments at the edge of coverage area experience significant signal attenuation and cannot receive data reliably
Solution Approach 1:
The patent implements local quality optimization by assigning different transmission parameters to users based on their specific channel conditions. Edge users receive optimized parameters tailored to their poor signal conditions, ensuring reliable reception without significantly impacting overall resource utilization through efficient resource scheduling.
Solution Approach 2:
The patent employs dynamic adjustment of transmission parameters based on real-time channel quality feedback. This allows the system to adapt to changing conditions, optimizing resource utilization while ensuring edge users can reliably receive data when channel conditions permit, and providing robust transmission when conditions are poor.
Data Source
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AI summary
Embodiments of the present invention disclose a communication method and a related product. A method implemented on an access network side includes: sending, by an access network device, indication information to user equipment, where the indication information is used to indicate a manner of receiving multicast service data, and the receiving manner includes a unicast manner and/or a multicast manner; and sending, by the access network device, the multicast service data in the unicast manner and/or the multicast manner indicated by the indication information. Sending of the multicast service data is not limited to that all user equipments that receive the multicast service data receive the multicast service data in the multicast manner, thereby facilitating exclusion of user equipment that affects transmission efficiency, and improving the transmission efficiency of a multicast service.