Overlapping Control Channel Search Spaces in LTE
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Solution Overview
Problem
In LTE communication systems, existing control channel configurations face challenges in efficiently coexisting and overlapping with newer releases, leading to resource wastage and interference, particularly in supporting spatial multiplexing and frequency-selective scheduling.
Innovation Solution
Configuring a new search space for a control channel that partially overlaps with an existing channel, allowing for efficient coexistence by defining protected resource areas and utilizing common reference signals for demodulation, while supporting beamforming and spatial multiplexing through overlapping resource regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control channels from different LTE releases are configured to coexist, then backward compatibility and support for advanced features are improved, but resource conflicts and interference increase
Solution Approach 1:
The control channel resources are segmented into different search spaces (common search space and UE-specific search space) with distinct resource allocations. This segmentation allows control channels from different LTE releases to operate in separated resource domains, reducing interference while maintaining coexistence
Solution Approach 2:
The patent introduces a new dimension for resource allocation by defining search spaces in the time-frequency domain with specific OFDM symbol ranges and resource block assignments. This dimensional separation allows overlapping control channels to be distinguished and processed without interference
2Productivity
If control channel search spaces are configured to overlap, then resource utilization efficiency is improved, but detection complexity and blind decoding overhead increase
Solution Approach 1:
Different search spaces are assigned different local qualities in terms of resource allocation patterns, aggregation levels, and monitoring configurations. This allows the system to optimize resource utilization in specific local regions of the time-frequency grid while managing detection complexity through structured search space designs
Solution Approach 2:
The patent implements partial overlap of search spaces rather than complete overlap, allowing sufficient resource utilization while limiting the extent of overlap to manageable levels. This partial action approach balances resource efficiency with detection complexity
3Reliability
If protected resource areas are defined for existing control channels, then reliability of legacy channels is improved, but available resources for new control channels are reduced
Solution Approach 1:
The patent introduces search space configuration as an intermediary layer that mediates between protected legacy control channel resources and new control channel requirements. This intermediary mechanism allows efficient resource allocation to both old and new channels without direct conflict
Data Source
AI summary
The present invention relates to configuring search spaces of at least two coexisting control channels in a communication system. In particular, the control channels are defined in at least partially overlapping regions, wherein the overlapping is in the time and/or frequency domain. This configuration enables coexistence of the at least two channels in the same resource grid and better utilization of the resources. Furthermore, it enables sharing of the reference signals.