E-PDCCH Start Symbol Configuration for TDD Subframe 6
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Solution Overview
Problem
In wireless communication systems, determining the starting Orthogonal Frequency Division Multiplexing (OFDM) symbol for the Enhanced Physical Downlink Control Channel (E-PDCCH) is ambiguous, affecting the blind decoding process at User Equipment (UE).
Innovation Solution
The method involves performing blind decoding on both common and UE-specific search spaces in separate Resource Blocks (RBs) of a subframe, with the first start OFDM symbol fixed at 4 and the second start OFDM symbol determined based on subframe type and higher-layer signaling, ensuring unambiguous decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single start OFDM symbol is used for both common and UE-specific search spaces, then the configuration is simple, but the decoding becomes ambiguous and unreliable
Solution Approach 1:
The patent segments the E-PDCCH resource region into two distinct parts: common search space and UE-specific search space. Each segment is assigned a separate start OFDM symbol (first start OFDM symbol for common, second start OFDM symbol for UE-specific), allowing independent configuration and unambiguous decoding for each search space type.
2Reliability
If separate start OFDM symbols are used for common and UE-specific search spaces, then decoding reliability improves, but configuration complexity increases
Solution Approach 1:
The patent applies local quality by assigning different start OFDM symbol values to different regions (common vs. UE-specific search spaces) based on their specific requirements. The first start OFDM symbol is configured for common search space while the second start OFDM symbol is configured for UE-specific search space, allowing each region to have optimized properties for its function.
3Adaptability or versatility
If the start OFDM symbol is determined by higher-layer signaling, then flexibility is improved, but the determination process becomes more complex
Solution Approach 1:
The patent uses preliminary action by pre-configuring the start OFDM symbol values through higher-layer signaling before the actual E-PDCCH transmission. The first start OFDM symbol and second start OFDM symbol are determined in advance based on system configuration, reducing real-time determination complexity while maintaining flexibility.
Data Source
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AI summary
An embodiment of the present invention relates to a method of obtaining control information through an enhanced physical downlink control channel (E-PDCCH) by a terminal in a wireless communication system. The method includes performing blind decoding on a common searching space in a set of first resource blocks on a subframe; and performing blind decoding on a terminal-specific searching space in a set of second resource blocks on the subframe, wherein a first start orthogonal frequency division multiplexing (OFDM) symbol of an E-PDCCH resource region including the common searching space in the set of first resource blocks and a second start OFDM symbol of an E-PDCCH resource region including the terminal-specific searching space in the set of second resource blocks are set individually.