Integrated Circuit Search-Space Allocation for Multi-Band Decoding
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Solution Overview
Problem
In LTE-A systems, the large number of blind decoding operations required for terminals communicating over multiple component bands increases circuit scale and power consumption without effectively managing the CCE block rate, leading to inefficiencies.
Innovation Solution
A base station and terminal configuration that sets a common search space and specific search spaces for each component band, assigning control information only to these spaces within designated bands to reduce blind decoding counts without increasing the CCE block rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal communicates over multiple component bands in LTE-A systems, then data transmission capacity is improved, but the number of blind decoding operations increases, leading to increased circuit scale and power consumption
Solution Approach 1:
The patent segments the control channel resources by introducing component band-specific search spaces. Instead of requiring blind decoding across all component bands, the terminal is assigned specific search spaces for each component band, dividing the decoding task into manageable segments corresponding to individual component bands rather than a monolithic search across the entire multi-band spectrum.
Solution Approach 2:
The patent applies local quality by configuring search spaces with different properties for different component bands. Each component band can have its own search space configuration (common or specific), allowing the system to optimize blind decoding requirements locally for each band rather than applying a uniform approach across all bands, thereby reducing the overall decoding burden.
2Productivity
If a terminal communicates over multiple component bands in LTE-A systems, then data transmission capacity is improved, but power consumption increases due to increased blind decoding operations
Solution Approach 1:
The patent segments the control channel monitoring task by component band, requiring the terminal to perform blind decoding only in specific search spaces associated with each component band rather than across all bands simultaneously. This segmentation reduces the total number of decoding operations and consequently lowers power consumption.
Solution Approach 2:
The patent implements partial action by having the terminal perform blind decoding only in necessary search spaces (common search space and/or specific search spaces) rather than exhaustively searching all possible control channel locations across all component bands. This partial monitoring approach suffices for receiving control information while significantly reducing energy expenditure.
3Reliability
If blind decoding is performed across all component bands, then control information reception reliability is improved, but the CCE block rate increases, reducing system efficiency
Solution Approach 1:
The patent segments control information transmission by component band, with each component band having its own search space configuration. This segmentation ensures that control information for each component band can be reliably received in its designated search space without requiring the terminal to decode across all bands, thereby maintaining reliability while improving system efficiency.
Solution Approach 2:
The patent introduces search spaces as intermediary structures that mediate between the control information and the terminal. By configuring common and specific search spaces, the system provides structured access points for control information transmission, ensuring reliable reception while managing the CCE block rate efficiently through organized resource allocation.
Data Source
AI summary
A wireless communication base station device which makes it possible to provide a base station, terminal and CCE allocation method capable of reducing the number of times blind decoding of a terminal is performed, without increasing the CCE block rate, even when a plurality of unit bands are set in a terminal. In this device, a search space setting section (103) sets in each of a plurality of unit bands a common search space in respect of a terminal which is communicating using the plurality of unit bands and other terminals, and sets in each of the plurality of unit bands an individual search space in respect of the terminal. An allocation section (106) allocates control information solely to CCEs within the common search spaces set in specified unit bands among the plurality of unit bands, or solely to CCEs within individual search spaces set in specified unit bands.