Interference Cancellation via Signaling Data Channel Configuration
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Solution Overview
Problem
In wireless communication systems, particularly in multi-user MIMO scenarios, it is challenging for mobile terminals to cancel interfering data streams intended for other users due to the lack of knowledge about the transport format (TF), modulation and coding scheme (MCS), and UE ID, leading to increased complexity and reduced detection robustness in environments with fast user turnover.
Innovation Solution
A network node provides configuration information of interfering data streams to mobile terminals, including TF, MCS, and UE ID, allowing the terminals to perform effective interference cancellation by transmitting this information when beneficial, using a special group ID for broadcasting and power-controlled signals to ensure efficient interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If configuration information of interfering data streams is not provided to mobile terminals, then network signaling overhead is reduced, but interference cancellation capability deteriorates
Solution Approach 1:
The network node performs preliminary actions by determining whether target terminals will benefit from interference information before transmitting it. This advance assessment ensures that configuration information is only provided when necessary, avoiding unnecessary signaling overhead while maintaining interference cancellation capability where needed.
Solution Approach 2:
The system dynamically changes the parameter of information provision by transmitting configuration information of interfering data streams selectively based on terminal capabilities and channel conditions. This parameter change allows the system to adapt between providing full interference information, partial information, or no information, thereby optimizing the trade-off between signaling overhead and interference cancellation performance.
2Reliability
If configuration information of interfering data streams is provided to mobile terminals, then interference cancellation performance is improved, but device complexity increases
Solution Approach 1:
The network node applies partial action by providing only the necessary configuration information about interfering data streams to terminals that will benefit from it. Rather than providing complete information about all streams, the system selectively provides information about specific interfering streams, reducing terminal processing complexity while maintaining adequate interference cancellation performance.
3Ease of operation
If interference information is transmitted to all terminals, then interference cancellation is facilitated, but signaling overhead increases
Solution Approach 1:
The network node performs preliminary assessment to determine which target terminals will benefit from interference information before transmission. This preliminary action filters out terminals that do not need the information, ensuring that signaling resources are only consumed for terminals where interference cancellation will provide actual benefit, thereby reducing overall signaling overhead.
Data Source
AI summary
In MU-MIMO scenarios, a target terminal can be exposed to data streams intended for other terminals. If the target terminal is capable of interference cancellation, then a network node, such as a base station or RNC, can provide the target terminal with interference information so that the target terminal can efficiently cancel interferences due to these interfering data streams. The interference information may include one or more interfering configuration, each of which characterizes a related interfering data stream. The interference information can also include the identity of the other terminal that is the intended recipient of the interfering stream. The network node may determine whether the target terminal can benefit from the interference information. If so, the network node can provide the interference information to the target terminal.