GC-PDCCH Configuration for NR Unlicensed Spectrum Detection
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Solution Overview
Problem
The New Radio (NR) communication system lacks a standardized configuration for the Group Common-Physical Downlink Control Channel (GC-PDCCH), which complicates the detection of idle channels in unlicensed spectrums due to differences in subcarrier intervals and symbol-level uplink and downlink transmission, posing challenges in channel detection and utilization.
Innovation Solution
The design of the GC-PDCCH is improved by configuring it to transmit downlink control information, including the downlink transmission termination position, through multiple time slots, using both licensed and unlicensed spectrums, and optimizing the transmission period and position based on Max Channel Occupy Time (MCOT) and Orthogonal Frequency Division Multiplexing (OFDM) symbol lengths, to enhance channel detection efficiency and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the GC-PDCCH is configured without standardized parameters, then the system maintains flexibility in design, but the channel detection efficiency and utilization rate deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing specific GC-PDCCH configuration parameters including transmission period (set to 1 or 2 slots), time domain position (placed in first or second slot of the pair), frequency domain position (aligned with SFI indication), and resource element allocation. These parameter optimizations resolve the contradiction by establishing standardized values that maintain design flexibility while significantly improving channel detection efficiency and spectrum utilization rate in NR unlicensed bands.
2Productivity
If the GC-PDCCH transmission period is extended to cover multiple time slots, then the channel occupation time increases improving spectrum utilization, but the signaling overhead and detection complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the GC-PDCCH transmission into pairs of time slots with clear structural organization. Each pair contains two slots with specific roles (first slot for potential GC-PDCCH transmission, second slot for continuation or alternative transmission). This segmentation reduces detection complexity by providing predictable transmission patterns while maintaining extended channel occupation time for improved spectrum utilization.
Solution Approach 2:
The patent implements periodic action by setting the GC-PDCCH transmission period to regular intervals (1 or 2 slots) within the time slot pair structure. This periodic transmission pattern allows user equipment to predict when GC-PDCCH transmissions will occur, reducing blind detection complexity while ensuring continuous spectrum utilization through regular retransmissions or alternative transmissions in the paired slot structure.
3Reliability
If the GC-PDCCH is transmitted in unlicensed spectrum only, then the channel detection requirements are stringent improving reliability, but the transmission opportunities are reduced
Solution Approach 1:
The patent applies universality by designing the GC-PDCCH configuration to function effectively in both unlicensed and licensed spectra. The same configuration parameters (transmission period, time domain position, frequency domain position) are optimized to work across different spectrum types. This multi-functionality allows the system to maintain reliable channel detection in unlicensed bands while also utilizing licensed spectrum for additional transmission opportunities, thereby resolving the contradiction between detection reliability and transmission availability.
Data Source
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AI summary
An electronic device, a radio communication method, and a computer readable storage medium. The electronic device comprises a processing circuit, and is configured to use a group common-physical downlink control channel (GC-PDCCH) to transmit control information relating to data in a time slot preceding a time slot of the GC-PDCCH. In the invention, a GC-PDCCH can be better designed according to characteristics of an NR communication system.