Interference Information Indication for NOMA Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively indicating and canceling interference between User Equipments (UEs) in non-orthogonal multiple access scenarios, leading to reduced system capacity and increased delay, particularly due to intra-cell and inter-cell interference.
Innovation Solution
A method and apparatus for indicating interference information to User Equipments (UEs) via dynamic or semi-static signaling, allowing them to cancel interference by providing parameters such as interfering layer or UE information, spreading sequences, transmit power, modulation and coding schemes, and PRB indices, enabling all, partial, or no interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access (NOMA) technology is implemented to improve system capacity and reduce delay, then more UEs can communicate concurrently, but intra-cell interference between UEs increases and requires complex interference cancellation
Solution Approach 1:
The patent introduces an intermediary mechanism where the network device (eNB) acts as a mediator by signaling interference information to UEs. This intermediary approach allows UEs to perform network-assisted interference cancellation without requiring complex blind detection capabilities, thus resolving the contradiction between improved system capacity and reduced interference cancellation complexity
Solution Approach 2:
The patent applies preliminary action by having the network device pre-signal interference information (such as spreading sequences, power levels, and modulation schemes) to UEs before the actual data reception. This allows UEs to prepare interference cancellation parameters in advance, reducing the computational complexity during active communication while maintaining high system capacity
2Loss of information
If blind detection of interference information is performed by UEs, then signaling overhead is reduced, but detection complexity and error rate increase significantly
Solution Approach 1:
The network device serves as an intermediary that provides structured interference information through signaling. This intermediary approach balances the trade-off by reducing signaling overhead compared to full blind detection while avoiding the high complexity and error rates associated with completely blind interference detection by UEs
3Reliability
If complete interference cancellation is performed by all UEs, then communication quality improves, but processing time and computational resources increase
Solution Approach 1:
The patent applies partial action by enabling UEs to perform interference cancellation selectively based on signaled parameters rather than requiring complete cancellation for all UEs. The network device signals interference information that allows UEs to cancel interference partially or fully depending on their specific reception conditions, thus improving communication quality for those who need it while reducing processing time for others
Solution Approach 2:
The patent introduces dynamic interference cancellation where the extent of cancellation is adjusted based on real-time conditions. The network device can dynamically signal different interference parameters to different UEs, allowing the system to adapt the level of interference cancellation to actual communication needs, balancing quality improvement with processing efficiency
Data Source
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AI summary
Disclosed are an interference information indicating method, and an interference cancelling method and device. The interference information indicating method comprises: network equipment determines interference information indicated to a user equipment (UE), the interference information being used for instructing the UE to perform all cancellation, partial cancellation, or no cancellation on interference in a received signal; and the network equipment indicates the interference information to the UE by signaling. By using the method and device provided by the embodiments of the present invention, network equipment can acquire interference information relevant to a UE, and can further transmit the interference information to the UE, thereby enabling the UE to perform, according to the interference information, interference cancellation on a received signal.