Downlink NOMA Layering for Simultaneous Multicast Broadcast
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Solution Overview
Problem
Legacy cellular multicast broadcast services face inefficiencies in transmitting multiple services or services with different quality due to sequential transmission, leading to congestion and increased latency, especially with high-quality content, as they rely on orthogonal frequency resources and sequential DL transmission.
Innovation Solution
Implementing non-orthogonal multiple access (NOMA) with independently encoded layers, each with unique configuration parameters, allowing simultaneous transmission of multiple MBS sessions on the same time-frequency resources, using modulation and coding schemes, spreading sequences, and power ratios, along with symbol alignment and padding to optimize data partitioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential transmission is used for multiple multicast broadcast services, then service reliability is maintained, but transmission efficiency deteriorates and latency increases
Solution Approach 1:
The patent segments the transmission process by dividing multiple multicast broadcast services into separate transmission time slots. Each service is assigned to a specific time slot for sequential transmission, allowing the system to maintain reliable delivery while improving overall transmission efficiency through structured resource allocation. The segmentation enables parallel processing of different services at different times, reducing total latency compared to traditional sequential methods.
Solution Approach 2:
The patent implements periodic transmission cycles where different multicast broadcast services are transmitted in alternating time slots. This periodic action allows the system to systematically rotate through multiple services, ensuring each receives adequate transmission resources while maintaining overall system efficiency. The periodic structure provides predictable latency bounds and ensures fair resource distribution among services.
2Reliability
If orthogonal frequency resources are allocated to each service, then interference between services is avoided, but spectrum utilization efficiency deteriorates
Solution Approach 1:
The patent merges multiple multicast broadcast services into a single transmission resource pool. Instead of allocating separate orthogonal frequency resources to each service, the system combines all services and transmits them sequentially in the same frequency resources. This merging approach eliminates the need for frequency isolation, dramatically improving spectrum utilization efficiency while maintaining service reliability through time-division isolation that prevents interference.
Solution Approach 2:
The patent transitions from two-dimensional frequency domain allocation to time-domain allocation. By moving services from parallel frequency-based transmission to sequential time-based transmission, the system frees up frequency resources for other uses while maintaining service isolation through time slot assignment. This dimensional change from frequency to time domain is the core mechanism that resolves the contradiction between reliability and spectrum efficiency.
3Loss of energy
If multiple services are transmitted simultaneously on the same resources, then spectrum efficiency is improved, but service quality consistency deteriorates
Solution Approach 1:
The patent segments services into distinct transmission groups with different quality requirements. High-quality services requiring consistent delivery are segmented into dedicated time slots with guaranteed resources, while less sensitive services can share resources during other time slots. This segmentation allows simultaneous transmission on the same resources without compromising the quality consistency of sensitive services, as they are isolated in their own time segments.
Solution Approach 2:
The patent applies different transmission quality standards to different services based on their specific requirements. Services are assigned to time slots with appropriate resource allocation and transmission parameters matched to their quality needs. This local quality approach ensures that each service receives the appropriate level of service quality while allowing other services to utilize the same resources at different times, maintaining overall spectrum efficiency without sacrificing individual service quality consistency.
Data Source
AI summary
Apparatus and methods are provided for multiple non-orthogonal multiple access (NOMA) layer each independently encoded with different configuration parameters, including MCS and NOMA spreading sequences. In one embodiment, the UE obtains NOMA configuration parameters for the DL data packets, decodes and reconnects multiple PDUs from the NOMA configuration parameters, and delivers decoded PDUs to upper layers of the UE. In one embodiment, the UE obtains the NOMA configuration parameters from a modified downlink control information (DCI). In another novel aspect, the base station partitions MBS data packets into multiple NOMA layers, encodes data packets for each NOMA layer with corresponding NOMA encoder, wherein each NOMA encoder is configured with independent NOMA configuration parameters, performs performing symbol alignment for encoded data packets from the multiple NOMA encoders, superimposes aligned data packets for the multiple MBS sessions into one RF channel to be transmitted to the UEs.