Non-Orthogonal Multiplexing Interference Cancellation in LTE Terminals
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Solution Overview
Problem
In communication systems like LTE, terminal apparatuses face challenges in efficiently learning information about interference signals to suppress inter-user interference, which affects throughput and communication opportunities.
Innovation Solution
A base station apparatus and terminal apparatus configuration that enables efficient learning of interference signal information through the transmission of assist information, allowing the terminal apparatus to cancel or suppress interference, thereby enhancing throughput and communication opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminal apparatuses are non-orthogonally multiplexed to perform transmission, then system capacity and communication opportunity are increased, but inter-user interference occurs
Solution Approach 1:
The patent introduces an interference signal information notification mechanism as an intermediary between the base station and terminal apparatuses. The base station notifies terminal apparatuses of interference signal information (such as resource allocation, modulation and coding scheme, and precoding matrix indicator) that terminals use to cancel or suppress inter-user interference through interference cancellation processing, thereby resolving the contradiction between increased system capacity and inter-user interference
2Reliability
If terminal apparatus learns interference signal information to cancel interference, then interference suppression is improved, but signaling overhead and complexity increase
Solution Approach 1:
The patent makes the interference signal information notification mechanism universally applicable to all terminal apparatuses engaged in non-orthogonal multiplexing. The same notification mechanism serves multiple purposes: it provides resource allocation information, modulation and coding scheme information, and precoding matrix indicator information that terminals use for interference cancellation, thereby improving interference suppression without proportionally increasing signaling overhead
3Productivity
If terminal apparatus performs interference cancellation, then throughput is enhanced, but processing complexity and computation increase
Solution Approach 1:
The patent applies preliminary action by having the base station notify terminal apparatuses of interference signal information before the terminals perform interference cancellation processing. This advance notification includes essential parameters such as resource allocation, modulation and coding scheme, and precoding matrix indicator, allowing terminals to prepare for efficient interference cancellation without increasing real-time processing complexity
Data Source
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AI summary
To provide a base station apparatus, a terminal apparatus, and a communication method where the terminal efficiently learns information of an interference signal and reduces interference in a reception process to thereby enhance throughput. Provided is a terminal apparatus for communicating with a base station apparatus, the terminal apparatus including: a higher layer processing unit for which multiuser superposition transmission (MUST) is configured by the base station apparatus; and a reception unit configured to receive, in a case that the MUST is configured, downlink control information including any of power allocation information, presence/absence of interference, and indication of whether the terminal apparatus is a near-UE or a far-UE or a superposition transmission method.