GC-PDCCH Termination Signaling for Unlicensed NR Detection
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Solution Overview
Problem
The design of the Group Common-Physical Downlink Control Channel (GC-PDCCH) in the NR communication system is challenged by the need to improve channel detection for unlicensed spectrums due to differences in subcarrier intervals and symbol-level uplink and downlink transmission compared to LTE.
Innovation Solution
An electronic device is configured to transmit and receive information of a downlink transmission termination position for unlicensed spectrums through a GC-PDCCH, allowing for flexible configuration of GC-PDCCHs in multiple time slots and incorporating parameters like MCOT and OFDM symbol lengths to enhance channel detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GC-PDCCH is designed according to conventional LTE standards, then the system maintains compatibility with existing protocols, but the channel detection efficiency for unlicensed spectra is insufficient due to different subcarrier intervals and symbol-level transmission requirements
Solution Approach 1:
The patent changes key parameters of GC-PDCCH including subcarrier interval (supporting both 15kHz and 30kHz), cyclic prefix length, and symbol allocation to adapt to unlicensed spectrum requirements while maintaining LTE compatibility. This allows the system to optimize channel detection efficiency for different spectrum types without requiring complete protocol redesign.
2Measurement precision
If GC-PDCCH transmits detailed downlink control information for each user equipment individually, then the control accuracy is improved, but the signaling overhead and processing complexity increase significantly
Solution Approach 1:
The patent merges control information for multiple user equipments into a single GC-PDCCH transmission. The group common PDCCH carries downlink control information that can be interpreted by multiple UEs simultaneously, reducing signaling overhead while maintaining necessary control accuracy through group-based scheduling and resource allocation.
Solution Approach 2:
The GC-PDCCH is designed to serve multiple functions: it provides downlink control information for group scheduling, indicates resource allocation for multiple UEs, and supports both licensed and unlicensed spectrum operations. This multi-functionality reduces the need for separate control channels while maintaining control precision.
3Ease of operation
If the downlink transmission termination position is not indicated in advance, then the GC-PDCCH structure remains simple, but the user equipment cannot prepare in advance for uplink feedback transmission
Solution Approach 1:
The patent implements preliminary action by indicating the downlink transmission termination position (or duration) in the GC-PDCCH before the actual downlink data transmission. This allows user equipment to calculate the uplink feedback timing in advance and prepare for uplink transmission, ensuring timely feedback without requiring complex real-time timing calculations.
Data Source
AI summary
The present disclosure relates to an electronic device, a radio communication method, and a computer readable storage medium. The electronic device of the present disclosure comprises a processing circuit and is configured to use a group common-physical downlink control channel (GC-PDCCH) to transmit information about a termination position of a downlink transmission using an unlicensed spectrum. The electronic device, the radio communication method, and the computer readable storage medium of the present disclosure can be used to better design a GC-PDCCH according to characteristics of an NR communication system.