Multiuser Superposition Transmission DCI Signaling
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Solution Overview
Problem
In 5G communication systems, existing technologies face challenges in efficiently transmitting additional control information for Multiuser Superposition Transmission (MUST) operations, particularly in managing interference and optimizing resource allocation for UEs using different precoders and transmission modes.
Innovation Solution
The proposed method involves transmitting signaling messages and Downlink Control Information (DCI) to support multiuser superposition transmission, including indications for MUST, power allocation, and interference cancellation, allowing near UEs to receive and process signals from both near and far UEs on the same resources, and enabling efficient interference removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs share the same time/frequency resources in MUST, then system throughput and resource utilization improve, but interference management and signal separation become more complex
Solution Approach 1:
The patent introduces Downlink Control Information (DCI) as an intermediary that carries essential parameters (power allocation, resource allocation, modulation and coding scheme) for each UE. This intermediary provides the near UE with the knowledge needed to perform Successive Interference Cancellation (SIC), transforming the complex interference management problem into a structured process guided by control information.
Solution Approach 2:
The patent applies preliminary action by providing the near UE with advance information about the superposed signals through DCI before the actual reception. The control information includes power allocation ratios and other parameters that enable the near UE to pre-calculate and remove interference from far UEs, making the SIC process more efficient and less complex.
2Reliability
If additional control information is transmitted for MUST operations, then MUST performance and interference cancellation capability improve, but signaling overhead and resource consumption increase
Solution Approach 1:
The patent segments the control information into specific DCI fields that are transmitted only when MUST is activated. The DCI format includes segmented elements such as power allocation information, resource allocation, and modulation and coding scheme parameters for each UE. This segmentation allows the system to transmit only the necessary control information for MUST operations rather than full control messages.
Solution Approach 2:
The patent changes the parameter representation by using compact fields in DCI to convey essential MUST parameters. Instead of transmitting full control messages, the system uses optimized parameter encodings such as power allocation ratios and simplified resource indicators, reducing the overall signaling overhead while maintaining the reliability needed for successful MUST operations.
3Measurement precision
If near UEs perform SIC to remove far UE signals, then near UE reception accuracy improves, but reception complexity and processing load increase
Solution Approach 1:
The patent applies preliminary action by providing the near UE with DCI information that includes power allocation ratios and other parameters of far UE signals before the near UE attempts to receive its own signal. This advance information allows the near UE to pre-calculate the interference components and perform SIC more efficiently, reducing the actual processing complexity during signal reception.
Solution Approach 2:
The system uses feedback mechanisms where the near UE reports channel state information and reception status to the base station. This feedback loop allows the base station to optimize the DCI parameters and power allocation for subsequent MUST transmissions, gradually reducing the SIC complexity at the near UE while maintaining high reception accuracy through iterative optimization.
Data Source
AI summary
A method and an apparatus for supporting multiuser superposition transmission. The method includes transmitting a signaling message including an indication of multiuser superposition transmission to a first UE among UEs scheduled for multiuser superposition transmission, transmitting, to the first UE, first DCI containing transmission information for the first UE and second DCI containing transmission information for at least one second UE among the UEs for multiuser superposition transmission, and transmitting a first downlink signal containing data for the first UE and a second downlink signal containing data for the second UE in a superposed manner on same resources.