NOMA User Equipment Interference Cancellation via SIC
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Solution Overview
Problem
Current Non-Orthogonal Multiple Access (NOMA) schemes lack detailed operational information for interference cancellation, hindering efficient data reception in next-generation wireless communication systems.
Innovation Solution
A method for user equipment (UE) to receive downlink control information, decode and cancel interference data, and transmit hybrid automatic repeat request (HARQ) ACK/NACK, while determining successful reception of interference data for effective interference cancellation and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NOMA scheme is implemented to improve bandwidth efficiency, then bandwidth efficiency is improved, but interference between user equipments increases
Solution Approach 1:
The patent converts the harmful interference between users into a beneficial signal by having the first UE decode the second UE's data and use it for interference cancellation. The interference that initially degrades performance becomes a means to improve it through SIC, directly resolving the contradiction between bandwidth efficiency and interference.
Solution Approach 2:
The first UE performs preliminary decoding of the second UE's data before decoding its own data. This preliminary action enables the first UE to prepare the interference cancellation signal in advance, allowing successful interference removal and subsequent data recovery without performance degradation.
2Object-generated harmful factors
If interference cancellation is performed to reduce interference, then interference is reduced, but device complexity increases
Solution Approach 1:
The system enables self-service interference cancellation where the first UE autonomously decodes the second UE's data and generates the cancellation signal without external assistance. This self-service approach reduces the need for complex centralized interference management while achieving effective interference removal.
3Reliability
If detailed operational information is provided for interference cancellation, then interference cancellation performance is improved, but loss of information increases
Solution Approach 1:
The patent merges the DCI formats by incorporating the second UE's DCI information within the first UE's DCI structure. This combining approach transmits all necessary interference cancellation information (second UE's resource allocation, MCS, HARQ info) without requiring separate signaling, thus improving cancellation performance while minimizing information loss.
Data Source
AI summary
A non-orthogonal multiple access (NOMA) scheme data receiving method is provided. The method can comprise the steps of: receiving, by a user equipment (UE), downlink control information (DCI) for a NOMA scheme; receiving downlink data on the basis of the DCI; decoding interference data included in the received downlink data; cancelling decoded interference data in the received downlink data if the decoding is successful; and decoding the own downlink data remaining after the interference data has been cancelled.