Repeated PDCCH Scheduling for Multi-TRP Interference Control
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Solution Overview
Problem
Existing MIMO transmission schemes in wireless communication face challenges in efficiently utilizing multiple transmission and reception points (TRPs) for PDCCH transmissions, particularly in multi-TRP scenarios, leading to inefficiencies in resource allocation and potential interference.
Innovation Solution
The proposed solution involves a method for resource allocation in a UE that receives repeated PDCCHs from a network, where each PDCCH schedules the same PDSCH. The UE determines resources for transmission or reception based on the latest start or ending symbol of the PDCCHs, utilizing multi-TRP repetition or multi-chance schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDCCHs are transmitted from different TRPs to schedule the same PDSCH, then the reliability of control channel transmission is improved, but the resource allocation complexity and potential interference increase
Solution Approach 1:
The patent segments the PDCCH transmission across multiple TRPs (Transmission Reception Points), where each TRP transmits a separate PDCCH instance scheduling the same PDSCH. This segmentation allows the UE to receive redundant scheduling information from different spatial locations, improving reliability while maintaining manageable resource allocation through structured TCI state associations.
Solution Approach 2:
The patent establishes preliminary resource allocation rules where the UE determines resources for PDSCH reception based on the latest PDCCH parameters before actual transmission occurs. By pre-defining the resource determination logic (using the latest PDCCH's start/ending symbols and TCI states), the system avoids complex real-time resource allocation decisions while maintaining high reliability through multi-TRP diversity.
2Reliability
If PDCCH repetition is implemented across multiple TRPs, then the coverage and robustness of control channel delivery are enhanced, but the time and frequency resource consumption increase
Solution Approach 1:
The patent merges multiple PDCCH transmissions from different TRPs into a unified resource allocation framework. Instead of treating each PDCCH repetition as an independent resource allocation event, the system combines them under a single resource determination rule based on the latest PDCCH parameters, reducing time loss by avoiding redundant resource allocation procedures.
Solution Approach 2:
The patent uses copying of PDCCH content across multiple TRPs, where identical DCI (Downlink Control Information) is transmitted from different spatial locations. This copying approach enhances delivery robustness through spatial diversity while minimizing time resource consumption by reusing the same DCI payload rather than transmitting different information in each repetition.
3Adaptability or versatility
If multiple TCI states are associated with a single PDCCH candidate, then the flexibility of beam management is improved, but the measurement and detection difficulty increases
Solution Approach 1:
The patent applies local quality by associating different TCI (Transmission Configuration Indicator) states with specific portions or aspects of the PDCCH reception. Each TCI state corresponds to a specific beam or spatial filter, allowing the system to optimize local reception quality for each TRP while maintaining overall beam management flexibility. The UE can selectively apply appropriate TCI states based on which TRP's PDCCH is being decoded.
Data Source
AI summary
A method and a user equipment (UE) are provided for resource allocation. The UE receives repeated physical downlink control channels (PDCCHs) from a network. Each of the repeated PDCCHs includes downlink control information (DCI) that schedules reception of a same physical downlink shared channel (PDSCH) at the UE. The UE determines resources for at least one of transmission and reception at the UE, from a PDCCH having a latest start symbol or a latest ending symbol among the repeated PDCCHs. The repeated PDCCHs are received in accordance with the UE and the network communicating using a multi-transmission reception point (TRP) repetition scheme or a multi-TRP multi-chance scheme.