PDCCH Repetition Scheduling for Reliable Blind Decoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving downlink control information, particularly in environments with high data rates and diverse service requirements such as eMBB, mMTC, and URLLC, where beamforming and advanced modulation techniques are employed.
Innovation Solution
A method and device for efficiently transmitting and receiving downlink control information in a wireless communication system, utilizing repetitive transmission and reception techniques, including beamforming and advanced modulation schemes like FQAM and SWSC, to enhance communication efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If downlink control information is transmitted using beamforming techniques in 5G systems, then transmission distance and data rate are improved, but the complexity of receiving control information increases due to multiple beams and advanced modulation schemes
Solution Approach 1:
The patent segments the downlink control information transmission into multiple repetitions across different time slots. Each repetition contains the same control information, allowing the UE to receive and decode the information multiple times. This segmentation approach simplifies reception by distributing the complexity across time rather than requiring simultaneous processing of multiple beams and advanced modulation schemes.
Solution Approach 2:
The patent implements periodic repetition of downlink control information transmissions. The control information is transmitted multiple times at regular intervals (e.g., every 25.2 µs or 50.4 µs), creating a periodic reception pattern. This periodic action allows the UE to synchronize and decode control information reliably without needing to process complex beamforming combinations simultaneously.
2Reliability
If repetitive transmission of downlink control information is implemented, then reception reliability is improved, but transmission time and power consumption increase
Solution Approach 1:
The patent uses periodic repetition with optimized intervals (25.2 µs or 50.4 µs) to balance reliability and time efficiency. The control information is transmitted multiple times at these regular intervals, ensuring reliable reception while minimizing the total time overhead. The periodic structure allows the network to adjust the repetition interval based on channel conditions and UE requirements.
Solution Approach 2:
The patent changes transmission parameters dynamically, including the repetition interval (25.2 µs or 50.4 µs), the number of repetitions (e.g., 2 or 4 times), and the timing offset (0 or 12.6 µs). These parameter adjustments allow the system to optimize between reliability and time consumption based on current channel conditions, UE capabilities, and service requirements.
3Productivity
If advanced modulation schemes like FQAM and SWSC are used, then spectral efficiency and data rate are improved, but the difficulty of detecting and measuring control information increases
Solution Approach 1:
The patent segments the control information transmission into multiple repetitions, allowing the UE to receive and decode the same information multiple times. This segmentation approach reduces the detection difficulty by providing multiple opportunities to successfully decode the control information, even when using advanced modulation schemes like FQAM and SWSC that have higher spectral efficiency but greater complexity.
Data Source
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AI summary
A method and device for repetitive transmission/reception of downlink control information in a wireless communication system is disclosed, the method performed by a user equipment (UE) in the wireless communication system comprises transmitting, to a base station, first information related to physical downlink control channel (PDCCH) repetition transmission, the first information including second information associated with a number of blind decoding times of PDCCH candidates, receiving, from the base station, configuration information on a control resource set and a search space configured for PDCCH transmission, and receiving, from the base station, control information on a first PDCCH and a second PDCCH based on the first information and the configuration information, the second PDCCH being a repetition of the first PDCCH.