PDCCH Repetition Search Space for NR-Lite Coverage and Complexity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LTE technologies, such as MTC and NB-IoT, struggle to meet the increased data rate and latency requirements of emerging Internet of Things services like video surveillance and smart home applications, which demand several tens of megabytes to 100 megabytes, due to limitations in bandwidth and channel conditions.
Innovation Solution
Implementing a method for configuring dedicated candidate search spaces for PDCCH multiple repetition transmissions in NR-lite devices, limiting aggregation levels and candidate transmission locations to reduce blind decoding complexity and support more PDCCH repetitions, using centralized transmission to enhance coverage and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH multiple repetition transmissions are implemented to enhance coverage, then coverage and reliability are improved, but blind decoding complexity increases
Solution Approach 1:
The patent segments the search space by introducing a dedicated candidate search space set for PDCCH multiple repetition transmissions, separating it from other search spaces. This segmentation allows the terminal to specifically identify and process repetition transmissions without having to blindly decode all possible PDCCH candidates across all search spaces, thereby reducing complexity while maintaining coverage enhancement.
Solution Approach 2:
The patent performs preliminary configuration by pre-defining the dedicated candidate search space set for PDCCH repetitions before actual transmissions occur. The network configures parameters such as search space IDs, aggregation levels, and candidate quantities in advance, allowing the terminal to prepare its blind decoding strategy beforehand, thus reducing real-time processing complexity when repetitions are received.
2Device complexity
If aggregation levels and candidate transmission locations are limited to reduce blind decoding complexity, then device complexity is reduced, but transmission flexibility is restricted
Solution Approach 1:
The patent applies local quality by configuring different aggregation levels and candidate quantities specifically for the dedicated PDCCH repetition search space set, rather than uniformly across all search spaces. This allows optimized, simpler configurations for repetitions while maintaining full flexibility in other search spaces, resolving the contradiction between reduced complexity and maintained adaptability.
Solution Approach 2:
The patent enables dynamic adaptation by allowing the network to flexibly configure the dedicated search space set parameters (aggregation levels, candidate quantities, time-frequency resources) based on actual transmission needs. The configuration can be adjusted per PDCCH repetition group or per terminal, maintaining transmission flexibility while keeping device processing manageable through predefined constraints.
3Reliability
If centralized transmission is used to enhance coverage and power efficiency, then coverage and energy consumption are improved, but transmission diversity is reduced
Solution Approach 1:
The patent merges multiple PDCCH repetition transmissions into a dedicated search space set with unified configuration parameters. By consolidating repetition transmissions in a centralized, specifically configured search space rather than scattering them across multiple search spaces, the system enhances coverage through focused resource allocation while maintaining flexibility through configurable parameters like aggregation levels and candidate quantities.
Data Source
AI summary
A method for sending and receiving a physical downlink control channel (PDCCH). The method for sending a PDCCH includes: determining, from a candidate search space set for the physical downlink control channel (PDCCH) multiple repetition transmissions, a search space for sending a PDCCH, the candidate search space set for the PDCCH multiple repetition transmissions includes all search spaces or at least one search space in a time unit; and sending the PDCCH based on the determined search space.