NOMA Downlink Control Information Group Identifier Interference Cancellation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving downlink control information in Non-Orthogonal Multiple Access (NOMA) systems, leading to interference issues due to overlapping resource usage among users.
Innovation Solution
The proposed solution involves transmitting downlink control information using group identifiers to enable UEs to identify and cancel interfering transmissions, with techniques such as deterministic functions and RNTI-based encoding to facilitate interference cancellation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NOMA downlink transmissions are transmitted to increase system capacity, then data rate and capacity are improved, but interference from overlapping signals worsens
Solution Approach 1:
The patent applies interference cancellation techniques where UEs decode and subtract interfering NOMA transmissions from overlapping resources. By converting the harmful interference into a cancelable signal through downlink control information provision and iterative decoding, the system maintains high capacity while mitigating the adverse interference effects
Solution Approach 2:
The patent introduces downlink control information as an intermediary that enables UEs to identify and cancel interfering transmissions. This control information acts as a mediator between the base station's NOMA transmissions and the UE's reception, providing the necessary parameters for interference cancellation without requiring separate dedicated resources for each UE
2Reliability
If downlink control information is transmitted for each UE to enable interference cancellation, then interference mitigation is improved, but signaling overhead increases
Solution Approach 1:
The patent merges downlink control information for multiple UEs into shared physical downlink control channels. By combining control information transmission for different UEs in the same NOMA group into common channel resources, the system reduces redundant signaling while maintaining the ability to provide necessary interference cancellation parameters to each UE
3Reliability
If UEs perform interference cancellation operations on NOMA transmissions, then reception of intended transmissions is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by providing downlink control information before NOMA data transmissions. This allows UEs to pre-configure interference cancellation parameters and identify interfering signals in advance, reducing the computational burden during actual data reception and processing
Data Source
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AI summary
Techniques are described for wireless communication. A first method includes receiving downlink control information for a first UE based at least in part on a group identifier associated with a NOMA group including the first UE and at least a second UE; and receiving a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE. A second method includes receiving downlink control information for a first UE, the downlink control information for the first UE including an indication of at least a second UE; receiving downlink control information for the second UE based at least in part on the indication of at least the second UE; and receiving a set of NOMA downlink transmissions at the first UE based at least in part on the downlink control information for the first UE and the downlink control information for the second UE.