Multicarrier Radio Receiver Configuration for Interference Cancellation
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Solution Overview
Problem
In multi-carrier radio communications systems, the absence of common control channels on secondary carriers complicates inter-cell interference cancellation, leading to increased power consumption and synchronization delays for user equipment (UE) due to the need for extensive searching of scrambling codes, and existing solutions either limit performance on secondary carriers or increase signaling overhead.
Innovation Solution
A radio node with electronic circuitry to select between two receiver configurations based on the availability of common channels on secondary carriers, using information from the primary carrier to determine channel presence and switching between inter-cell and intra-cell interference cancellation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-cell interference cancellation is implemented on secondary carriers without common channels, then interference cancellation capability is improved, but device complexity and power consumption increase significantly
Solution Approach 1:
The patent applies local quality by differentiating receiver configurations across different carriers. On primary carriers with common channels, a full inter-cell interference cancellation receiver is used. On secondary carriers without common channels, a simplified receiver without inter-cell interference cancellation is used. This localized adaptation optimizes performance where possible while reducing complexity where common channel information is unavailable.
Solution Approach 2:
The patent implements dynamic receiver configuration selection based on the presence or absence of common channels on each carrier. The receiver can adaptively switch between different operational modes (with or without inter-cell interference cancellation) depending on the specific carrier being accessed, allowing optimal performance while managing complexity dynamically rather than statically.
2Reliability
If extensive searching of scrambling codes is performed to enable inter-cell interference cancellation, then interference cancellation performance is improved, but synchronization time and power consumption increase
Solution Approach 1:
The patent applies preliminary action by performing scrambling code identification and channel estimation using available common channels on the primary carrier before attempting inter-cell interference cancellation on secondary carriers. This preliminary processing provides initial channel information that reduces the need for extensive searching when common channels are present, thereby reducing synchronization time and power consumption.
3Device complexity
If a simplified receiver configuration is used on secondary carriers without common channels, then device complexity is reduced, but inter-cell interference cancellation capability is lost
Solution Approach 1:
The patent applies local quality by matching receiver complexity to the available information on each carrier. On secondary carriers where common channels are absent, a simplified receiver configuration is used that accepts the limitation of no inter-cell interference cancellation. This localized simplification reduces overall device complexity while maintaining optimal inter-cell interference cancellation capability on primary carriers where common channels are available.
Data Source
AI summary
A radio receiver uses a first receiver type for receiving data and/or control information on one or more secondary carrier channel(s) if one or more common channels(s) are transmitted on the corresponding secondary carrier. Otherwise, the radio receiver uses a second receiver type for receiving data and/or control information on one or more secondary carrier channel(s).