Span-Level TDM PDCCH Repetition for Multi-TRP DCI Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in enhancing PDCCH transmission reliability and robustness, particularly in scenarios involving multiple TRPs, due to limitations in UE capabilities for simultaneous beam reception and inefficient use of time-frequency resources.
Innovation Solution
Implementing span level Time-Division Multiplexing (TDM) PDCCH transmission schemes that utilize multiple TRPs, where DCI is transmitted with multiple repetitions across multiple spans, allowing for improved reliability and reduced latency by configuring PDCCH transmission parameters based on UE capabilities for monitoring and beam switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH is transmitted from multiple TRPs with multiple repetitions, then transmission reliability is improved, but UE complexity for monitoring and processing increases
Solution Approach 1:
The patent segments the PDCCH monitoring task by introducing the concept of span level repetitions, where the PDCCH is divided into multiple repetitions transmitted in different spans. The UE monitors only a subset of these repetitions based on its capability, thereby reducing monitoring complexity while maintaining reliability through selective reception of multiple transmissions.
Solution Approach 2:
The patent applies partial action by allowing the UE to monitor only a portion of the total PDCCH repetitions transmitted by the gNB. The UE capability indicates the maximum number of PDCCH candidates and non-overlapping CCEs it can monitor per span, enabling the system to transmit more repetitions than the UE needs to monitor, thus improving reliability without proportionally increasing UE complexity.
2Adaptability or versatility
If UE monitors more PDCCH candidates and non-overlapping CCEs per span, then PDCCH detection capability is improved, but UE processing load increases
Solution Approach 1:
The patent introduces dynamic adaptability by defining UE capability parameters (pdcch-MonitoringCapabilityConfig) that indicate the maximum number of PDCCH candidates and non-overlapping CCEs the UE can monitor per span. The gNB configures the PDCCH monitoring parameters based on the UE's reported capability, creating a dynamic system that adapts to different UE processing capacities while optimizing PDCCH detection capability.
3Reliability
If span level repetitions are configured for PDCCH, then transmission robustness is improved, but time-frequency resource overhead increases
Solution Approach 1:
The patent applies local quality by configuring span level repetitions with specific time-domain characteristics. Each repetition is transmitted in a separate span with defined start and length indicators, allowing the system to optimize the time-frequency resource allocation for each repetition locally. This enables robust transmission through multiple repetitions while controlling overall resource overhead through precise span configuration.
Data Source
AI summary
Apparatus and methods of span level TDM PDCCH transmission are disclosed. The apparatus includes: a receiver that receives a capability report from a device, wherein the capability report comprises Physical Downlink Control Channel (PDCCH) monitoring capability and/or beam switching capability of the device; a processor that generates PDCCH transmission parameters, based on the capability report, for transmitting a Downlink Control Information (DCI) with a plurality of PDCCH transmissions with span level repetitions; wherein the processor further configures, based on the PDCCH transmission parameters, a plurality of resources for transmitting the DCI, and a search space set for DCI detection in a PDCCH monitoring occasion set; and a transmitter that transmits the DCI in a plurality of DCI versions with the plurality of PDCCH transmissions using the plurality of resources.