PDCCH Reliability via Multi-TRP and TCI State Diversity
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Solution Overview
Problem
The sudden deterioration of radio conditions due to UE mobility and dynamic environments, particularly in the millimeter wave spectrum, poses a challenge for achieving ultra-reliable and low-latency wireless communication. This can result in deep fading of the radio channel, prohibiting reliable communication.
Innovation Solution
To enhance the reliability of the Physical Downlink Control Channel (PDCCH), the system employs multi-TRP, multi-beam, or repeated PDCCH transmissions. This involves transmitting PDCCH on multiple Control Resource Sets (CORESETs) associated with different Transmission Control Indicator (TCI) states, allowing for diverse reception paths and improving link reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-TRP PDCCH transmission is used, then device complexity is low, but reliability deteriorates under sudden radio condition deterioration
Solution Approach 1:
The patent segments the PDCCH transmission by dividing it into multiple independent parts transmitted through different TRPs (Transmission- reception points) and/or beams. Each segment can be received independently, allowing the UE to combine information from multiple segments to achieve reliable decoding even when one path fails due to blockage or deep fading.
Solution Approach 2:
The patent introduces spatial dimension diversity by transmitting PDCCH through multiple TRPs and/or multiple beams simultaneously. This adds a spatial dimension to the transmission, creating diverse reception paths that reduce the impact of blockage in any single direction, thereby improving reliability without significantly increasing complexity.
2Reliability
If multi-TRP/PDCCH transmission is used, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple PDCCH transmissions from different TRPs and/or beams into a unified reception process at the UE. The UE combines the received signals from multiple TRPs/beams to decode the PDCCH, achieving higher reliability while managing complexity through coordinated transmission and reception mechanisms.
Solution Approach 2:
The patent implements a universal PDCCH transmission framework that can operate in multiple modes (single-TRP, multi-TRP, single-beam, multi-beam) depending on radio conditions. This multi-functional approach allows the system to adapt to varying network conditions while maintaining a consistent reception mechanism at the UE, thereby improving reliability without proportionally increasing complexity.
3Reliability
If repeated PDCCH transmission is used, then reliability is enhanced, but loss of time increases
Solution Approach 1:
The patent employs periodic repetition of PDCCH transmissions, where the same PDCCH is transmitted multiple times at different time instances. This periodic action allows the UE to combine repeated signals to improve decoding reliability while managing the time overhead through efficient repetition patterns and configurations.
Data Source
AI summary
Systems and methods for PDCCH reliability are disclosed. The PDCCH may be improved by introducing multi-TRP, multi-beam or repeated, PDCCH transmission and reception. In some methods and systems, PDCCH is transmitted on multiple CORESETs (Control Resource Set), where each CORESET is associated with a TCI state. In some cases, it is beneficial if a UE can determine that multiple received DCIs are duplicates, in order not to duplicate the corresponding UE action. Methods and systems for DCI duplication determination are disclosed. In some methods and systems, PDCCH is transmitted in a single CORESET, where the CORESET is associated with multiple TCI states. Various ways to apply the different TCI states to different disjoint frequency parts of the CORESET or the whole CORESET are proposed. Furthermore, the TCI state used for PDCCH may be used for subsequent PDSCH reception as well, in some cases. The disclosure also presents methods and systems on how to apply multiple TCI states of a received PDCCH to a subsequent PDSCH reception.