Single CORESET PDCCH Diversity Across TRPs Against Fading
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving reliable and efficient Physical Downlink Control Channel (PDCCH) transmission in diverse deployment scenarios, particularly when multiple Transmission/Reception Points (TRPs) are involved, leading to issues like channel blocking and deep fading.
Innovation Solution
Implementing single Control Resource Set (CORESET) based PDCCH diversity over multiple TRPs by activating multiple Transmission Configuration Indicator (TCI) states and configuring search spaces with interleaved or separate resource elements (REs) for enhanced PDCCH reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single TRP PDCCH transmission is used, then device complexity is low, but reliability deteriorates due to channel blocking and deep fading
Solution Approach 1:
The patent segments the PDCCH transmission by dividing control resource elements into first set and second set, each associated with different TCI states representing different TRPs. This segmentation allows the system to transmit PDCCH through multiple TRPs simultaneously, improving reliability through diversity while maintaining manageable complexity through structured resource allocation
Solution Approach 2:
The patent introduces a new dimension of transmission by enabling a single CORESET to be associated with multiple TCI states, each pointing to different TRPs. This dimensional expansion from single-TRP to multi-TRP transmission within the same CORESET framework enhances reliability without requiring complete system redesign
2Reliability
If multiple TCI states are activated for a CORESET, then PDCCH diversity over multiple TRPs is achieved, but device complexity increases
Solution Approach 1:
The patent makes the CORESET structure universal by allowing it to serve multiple TRPs simultaneously through multiple TCI states. The same CORESET configuration can leverage different TCI states to access different TRPs, providing multi-functionality that enhances reliability while avoiding the need for separate CORESET configurations for each TRP
Solution Approach 2:
The patent merges multiple TRP transmissions into a single CORESET framework by associating multiple TCI states with one CORESET. This combining approach allows the UE to receive PDCCH from multiple TRPs through a unified configuration structure, reducing the overhead of managing separate CORESETs for each TRP
3Reliability
If PDCCH is transmitted over multiple TRPs, then block error rate decreases, but resource element allocation complexity increases
Solution Approach 1:
The patent applies local quality by assigning different TCI states to specific sets of control resource elements within the CORESET. Each TCI state is associated with specific REs that correspond to particular TRPs, allowing localized optimization of transmission quality for each TRP while maintaining overall system coherence through a unified CORESET structure
Data Source
AI summary
Systems and methods are disclosed for single Control Resource Set (CORESET) based Physical Downlink Control Channel (PDCCH) diversity over multiple Transmission/Reception Points (TRPs). In one embodiment, a method performed by a wireless communication device comprises receiving a message(s) that activates first and second TCI states for a CORESET comprising first and second sets of resource elements (REs) associated to the first and second TCI states, respectively, and receiving a configuration of PDCCH candidates comprising PDCCH candidates for each of one or more aggregation levels (ALs) in a search space (SS) set. Each PDCCH candidate comprises REs in the first and second sets of REs. The method further comprises receiving a Downlink Control Information (DCI) carried by: (a) a single PDCCH in one PDCCH candidate or (b) first and second repetitions of a PDCCH in the first and second set of REs, respectively.