Nested Control Channel Search Space for Wireless Decoding
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Solution Overview
Problem
Current control channel techniques in wireless communication systems are inefficient due to excessive resource usage by user equipment (UE) in decoding multiple control channel candidates and poor tolerance of channel conditions, leading to suboptimal performance in resource allocation and error correction.
Innovation Solution
Implementing a nested structure for control channel search spaces, where a lower aggregation level is a subset of a higher aggregation level, and reordering resource element groups (REGs) based on transmission modes, such as broadcast or beamformed unicast, to improve decoding efficiency and error correction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs monitor and decode multiple PDCCH candidates in the search space, then control channel coverage is improved, but UE resource consumption increases significantly
Solution Approach 1:
The patent implements a nested search space structure where control channel candidates at different aggregation levels are organized hierarchically. The type 1 search space (lower aggregation level) is nested within the type 2 search space (higher aggregation level), allowing UEs to efficiently search through candidates without redundant processing. This nesting reduces the total number of decoding attempts required while maintaining comprehensive coverage across different channel conditions.
2Ease of manufacture
If current REG ordering techniques are used, then implementation is simple, but tolerance to poor channel conditions is low
Solution Approach 1:
The patent applies different REG ordering strategies based on the specific search space type and aggregation level. Type 1 search spaces use one ordering approach optimized for lower aggregation levels, while type 2 search spaces use a different ordering approach optimized for higher aggregation levels. This localized optimization of REG ordering for different regions of the search space improves overall channel condition tolerance while maintaining reasonable implementation complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A method may include receiving a control transmission from a base station, identifying a control channel search space organized according to a nested structure, the control channel search space including a plurality of control channel candidates associated with one or more control channel elements (CCEs) and an aggregation level, and searching the received control transmission to identify a control channel for the UE using the plurality of control channel candidates. Another method may include determining whether to reorder resource element group (REG) indices for a received control channel transmission based, at least in part, on a transmission mode associated with the control channel transmission. Another method may include decoding a received control channel transmission, where the downlink control information (DCI) formats may be constrained to an integer multiple of a predetermined base number of bits N.