NR Control Channel Detection Using DMRS to Reduce Blind Decoding
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Solution Overview
Problem
Existing wireless communication systems face significant power consumption issues during blind decoding of downlink control channels, particularly in idle mode and connected modes, leading to reduced battery life in user equipment devices.
Innovation Solution
Implementing methods that utilize the presence of DMRS-specific to a UE in NR systems to reduce blind decoding by selectively performing channel estimation and decoding only on groups of CCEs where DMRS is detected, thereby conserving power and resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding is performed on all CCEs in NR systems, then control channel detection reliability is improved, but power consumption increases significantly
Solution Approach 1:
The patent extracts and utilizes DMRS (Demodulation Reference Signal) as a indicator to identify which CCE groups actually contain PDCCH transmissions. By taking out the DMRS detection step as a separate filtering mechanism, the system can identify relevant CCE groups without performing full blind decoding on all CCEs, thus reducing power consumption while maintaining detection reliability.
Solution Approach 2:
The patent performs DMRS detection as a preliminary action before blind decoding. This preliminary detection of DMRS presence in CCE groups allows the system to pre-identify which groups warrant further decoding processing, eliminating the need for exhaustive blind decoding across all CCEs and significantly reducing computational power requirements.
2Reliability
If blind decoding is performed on all CCEs to ensure accurate signal reception, then communication accuracy is improved, but battery life is reduced
Solution Approach 1:
The patent extracts DMRS detection as a separate preliminary step that filters out CCE groups without PDCCH transmissions. This extraction allows accurate signal reception to be focused only on relevant CCE groups identified by DMRS presence, rather than wasting battery power on exhaustive decoding of all CCEs.
Solution Approach 2:
By performing DMRS detection as a preliminary action before blind decoding, the system accurately identifies which CCE groups contain actual control information. This preliminary filtering ensures that subsequent decoding operations are performed only where necessary, maintaining signal reception accuracy while extending battery life through reduced processing.
3Reliability
If comprehensive blind decoding is performed across all CCE groups, then control information detection completeness is improved, but processing resources are wasted
Solution Approach 1:
The patent extracts DMRS presence detection as a filtering mechanism that identifies CCE groups containing PDCCH transmissions. This extraction enables the system to achieve detection completeness by focusing blind decoding only on DMRS-positive CCE groups, eliminating processing resource waste on CCE groups that contain no control information.
Solution Approach 2:
The patent implements DMRS detection as a preliminary action that precedes blind decoding. This preliminary step ensures detection completeness by identifying all CCE groups that may contain control information, while simultaneously reducing processing resource waste by eliminating unnecessary decoding operations on empty CCE groups.
Data Source
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AI summary
This disclosure relates to techniques for reducing blind decoding of downlink control channels in a wireless communication system. The techniques may include determining whether a control channel pilot signal, such as a demodulation reference signal (DMRS) is present within a set of control carrier entities, and accordingly determining whether the downlink control channel is present within the set of control channel elements. In this manner, a number of candidates for blind decoding may be reduced.