Control Channel Search Space Configuration for Wireless Communication
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the existing control channel design faces challenges with resource allocation and interference, leading to potential 'blocking' of DCI messages between UEs, especially when multiple messages need to be sent in a single subframe, which affects efficiency and reliability.
Innovation Solution
The proposed solution involves configuring a separate search space in the frequency domain for each candidate of the control channel message, making a pseudo-random selection of transmission locations, and transmitting the control channel message at these selected locations, allowing for efficient resource allocation and minimizing interference between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple DCI messages are transmitted in a single subframe using existing control channel design, then the system can serve multiple UEs, but the probability of message blocking increases and reliability decreases
Solution Approach 1:
The patent segments the control channel search space into multiple candidate locations within the frequency domain. Each DCI message candidate is associated with a specific search space location, allowing the terminal to perform blind decoding at multiple predetermined positions. This segmentation enables multiple messages to be transmitted simultaneously without blocking each other, as each message has a dedicated search space location.
Solution Approach 2:
The patent introduces a frequency domain dimension to the control channel transmission by defining multiple search space locations across different frequency resources. Instead of transmitting all DCI messages at a single location, the system distributes candidates across multiple frequency positions, adding a spatial dimension to the message delivery that prevents blocking and improves reliability.
2Device complexity
If a single search space is used for all DCI message candidates, then the device complexity is reduced, but the probability of interference and blocking between messages increases
Solution Approach 1:
The search space is segmented into multiple candidate locations, each associated with specific DCI message candidates. This segmentation allows the system to maintain relatively simple configuration while reducing interference, as each segment (search space location) is dedicated to specific candidates and terminals perform blind decoding at these predetermined positions.
3Ease of operation
If control channel messages are transmitted at fixed locations, then the terminal decoding process is simplified, but the adaptability to different channel conditions and interference patterns is reduced
Solution Approach 1:
The system performs preliminary action by pre-configuring multiple search space locations and associating them with specific DCI message candidates before transmission. The terminal uses these predetermined locations for blind decoding, which simplifies the decoding process while the multiple predefined positions provide adaptability to different channel conditions and interference patterns.
Data Source
AI summary
Wireless communication where a wireless network transmits a control channel message to a terminal. A receiver to receive the control channel message located in one or more control channel elements within a plurality of search spaces, each of the plurality of search spaces being configured from a plurality of control channel elements within a time interval for scheduling decision by using a pseudorandom function. A decoder to decode the control channel message by making a selection of locations for blind decoding the plurality of search spaces within the sub-frame, using the pseudorandom function, wherein, the pseudo-random function is a function based on a sum of a first value and a second value, wherein the first value is a pseudo-random factor, and the second value is based on an aggregation level and a total of control channel elements in a sub-frame.