Inter-Cell Signal Configuration Sharing for UE Interference Cancellation
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Solution Overview
Problem
In multi-user MIMO and inter-cell interference scenarios, victim UEs face challenges in canceling interfering data streams due to lack of knowledge about transport format, modulation and coding scheme, and UE ID, leading to complex blind detection and eavesdropping difficulties, especially in environments with fast user turnover and insufficient signal-to-interference-and-noise ratio.
Innovation Solution
A method where a serving base station receives configuration information about interfering data streams from neighboring base stations via inter-BS links, forming interference information that is then transmitted to the target mobile terminal using dedicated or shared radio resources, enabling effective interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind detection or eavesdropping is used to obtain interfering data stream configuration, then interference cancellation may be achieved, but the complexity increases significantly and reliability decreases in fast user turnover environments
Solution Approach 1:
The serving base station performs preliminary actions by proactively obtaining configuration information of interfering data streams from neighboring base stations via inter-BS links (e.g., X2 interface) before the victim UE needs to cancel interference. This pre-acquisition eliminates the need for complex blind detection at the UE side and ensures reliable configuration data is available when needed.
Solution Approach 2:
The serving base station acts as an intermediary between neighboring base stations and the victim UE. It collects configuration information from neighboring base stations through inter-BS links and then delivers this information to the victim UE via dedicated or shared radio resources, simplifying the overall system complexity while maintaining reliability.
2Productivity
If configuration information is transmitted to enable interference cancellation, then interference cancellation efficiency improves, but radio resource consumption increases
Solution Approach 1:
The patent applies local quality by selectively providing configuration information only to victim UEs that are actually experiencing interference and need cancellation capability. Not all UEs receive this information - only those in specific interference scenarios (MU-MIMO, cell edge, range expansion zones), thereby optimizing radio resource usage while maintaining high cancellation efficiency where needed.
Solution Approach 2:
The patent uses partial action by transmitting configuration information only when and where it is needed (to specific victim UEs in interference scenarios) rather than broadcasting to all UEs. This partial delivery approach balances the need for interference cancellation efficiency with the constraint of radio resource conservation.
3Adaptability or versatility
If configuration information is provided to victim UEs, then interference cancellation becomes feasible, but the system requires additional inter-BS communication infrastructure
Solution Approach 1:
The patent leverages the universality of existing inter-BS communication infrastructure (such as the X2 interface in LTE networks) for multiple purposes: normal base station coordination and the new function of sharing interfering data stream configuration information. This multi-functionality enables interference cancellation capability without requiring completely new dedicated communication channels between base stations.
Data Source
AI summary
In MU-MIMO scenarios, a target mobile terminal can be exposed to data streams intended for other mobile terminals. If the target mobile terminal is capable of interference cancellation, then a serving base station can provide the target mobile terminal with interference information so that the target mobile terminal can efficiently cancel interferences due to these interfering data streams. The interference information includes one or more configuration information, each of which characterizes a related interfering data stream. The serving base station provides the interference information over one or more radio resources that are exclusive allocated to the target mobile terminal or are allocated for common listening. The serving base station exchanges configuration information with neighboring base stations over inter-BS links. The inter-BS links use resources that are different from the radio resources used between the base stations and the mobile terminals.