PDCCH Search Space Segmentation for UE Complexity Reduction
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Solution Overview
Problem
In heterogeneous LTE networks with single cell identity, the processing complexity and power consumption for user equipment (UE) increase due to the need to blindly monitor multiple control channel search spaces, which limits the capacity and efficiency of PDCCH transmissions.
Innovation Solution
Configuring specific transmission elements for carrying control data within data transmissions, allowing UEs to focus their blind decoding efforts on predefined candidates, thereby reducing the complexity and power consumption by eliminating the need for separate control regions and enhancing PDCCH capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs blindly monitor multiple control channel search spaces in heterogeneous networks with single cell identity, then control data can be transmitted flexibly across multiple points, but processing complexity and power consumption for UEs increase
Solution Approach 1:
The patent segments the control channel search spaces into multiple distinct sets (first set and second set), each with specific monitoring requirements. This segmentation allows the system to maintain multiple search spaces for flexible control data transmission while providing structured organization that helps manage UE processing complexity through defined monitoring patterns and associations with different transmission points.
Solution Approach 2:
The patent implements dynamic search space configuration where the network can configure different sets of search spaces for different UEs based on their specific needs and the transmission point assignments. This dynamic approach allows control data transmission flexibility to adapt to changing network conditions while enabling UEs to monitor only the relevant search spaces configured for them, thereby managing processing complexity.
2Adaptability or versatility
If UEs blindly monitor multiple control channel search spaces in heterogeneous networks with single cell identity, then control data can be transmitted flexibly across multiple points, but power consumption for UEs increases
Solution Approach 1:
By segmenting search spaces into multiple configured sets with specific associations to transmission points, the patent enables UEs to identify and monitor only the relevant search spaces for their assigned transmission points. This segmentation reduces the effective number of search spaces each UE must monitor compared to a blanket monitoring approach, thereby reducing power consumption while preserving control data transmission flexibility.
Solution Approach 2:
The patent enables UEs to self-configure their monitoring behavior based on received configuration information that associates specific search spaces with specific transmission points. Each UE autonomously determines which search spaces to monitor based on its assigned transmission points, eliminating the need to blindly monitor all possible search spaces and thereby reducing power consumption while maintaining the ability to receive control data from multiple points.
3Reliability
If separate control regions are used for control data transmission, then control data can be clearly separated from user data, but PDCCH capacity is limited
Solution Approach 1:
The patent merges control data transmission with user data transmission by allowing control data to be transmitted within the same physical downlink shared channel (PDSCH) resources that carry user data. This merging eliminates the need for separate dedicated control regions, thereby increasing PDCCH capacity and resource utilization efficiency while maintaining reliable control data transmission through the use of multiple configured search spaces that provide clear logical separation and identification of control data locations.
Data Source
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AI summary
A method (1200) for transmission of control data to a user equipment (904) in a mobile telecommunication system (900), wherein the method (1200) comprises sending (1220) control data to the user equipment (904) in a data transmission (600, 700, 800, 1300, 1400), and performing, by the user equipment (904), a blind decoding (1260) of transmission elements within the data transmission (600, 700, 800, 1300, 1400) in order to detect the control data in a data region (604) in the data transmission (600, 700, 800, 1300, 1400).