Flexible PDCCH Repetition Scheduling Around Slot Format Overlap
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Solution Overview
Problem
In fifth-generation cellular systems, devices with reduced antennas and RF bandwidth face challenges in PDCCH/PDSCH channel coverage and reception reliability, leading to inefficient communication.
Innovation Solution
Implementing flexible PDCCH repetition mechanisms in user equipment (UE) and base stations, utilizing RRC parameters and DCI formats to determine optimal transmission and reception occasions, avoiding overlaps with uplink symbols, and adjusting PDSCH/PDCCH transmission occasions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of antennas and RF bandwidth are reduced to lower UE complexity and cost, then device complexity is reduced, but PDCCH/PDSCH channel coverage and reception reliability deteriorate
Solution Approach 1:
The base station performs preliminary actions by determining multiple PDSCH transmission occasions and proactively identifying and excluding those that overlap with uplink symbols before actual transmission. This prevents reliability issues before they occur, allowing reduced-antenna UEs to receive reliable downlink data without needing complex interference management capabilities.
Solution Approach 2:
The network side (base station) acts as an intermediary that manages the conflict between uplink and downlink resources. By determining valid PDSCH transmission occasions that avoid uplink symbol overlaps, the network mediates the resource allocation conflict, enabling simplified UEs to achieve reliable reception without complex self-management capabilities.
2Device complexity
If the number of antennas and RF bandwidth are reduced to lower UE complexity and cost, then device complexity is reduced, but PDCCH/PDSCH channel coverage deteriorates
Solution Approach 1:
The base station performs preliminary validation of transmission occasions against uplink symbol configurations before scheduling PDSCH transmissions. This advance planning ensures that transmissions occur in valid time-frequency resources, extending effective coverage for reduced-antenna UEs by eliminating coverage-guaranteeing resource conflicts.
3Productivity
If PDCCH/PDSCH transmission occasions overlap with uplink symbols, then resource utilization increases, but communication efficiency deteriorates due to interference and reliability issues
Solution Approach 1:
The invention extracts and removes invalid transmission occasions from the set of candidate PDSCH transmission opportunities. By excluding occasions that overlap with uplink symbols, the system separates useful transmissions from harmful ones, maintaining high resource utilization while ensuring communication reliability through selective resource allocation.
4Reliability
If flexible PDCCH repetition is implemented to improve reception reliability, then system complexity increases, but communication efficiency improves
Solution Approach 1:
The network side serves as an intermediary that manages PDCCH repetition configurations and transmission occasion determinations. This centralizes the complexity in the base station rather than the UE, allowing simplified UEs to benefit from enhanced reliability through network-managed repetition strategies without requiring complex local processing capabilities.
Data Source
AI summary
A user equipment (UE) is described. The UE includes reception circuitry configured to receive, from a base station, PDCCH with a first DCI format scheduling PUSCH repetitions, and a RRC parameter indicating slot format per slot, and control circuitry configured to determine, based on the first DCI format and the RRC parameter, multiple PUSCH transmission occasions with a first number for transmission of the PUSCH repetitions, wherein in a case that one or more symbols of a PUSCH transmission occasion in a slot overlap with one or more symbols indicated as downlink symbol by the RRC parameter, the PUSCH transmission occasion is not included in the multiple PUSCH transmission occasions for transmission of the PUSCH repetitions, and transmission circuitry further configured to transmit the PUSCH repetitions in the multiple PUSCH transmission occasions.