PDCCH Repetition Across CORESETs for Reliable DCI Reception
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Solution Overview
Problem
The existing wireless communication systems face challenges in efficiently transmitting and receiving physical downlink control channels due to resource shortages and high-speed service demands, particularly in 5G networks, which require enhanced reliability and efficiency in data processing.
Innovation Solution
A method for transmitting physical downlink control channels (PDCCH) involves receiving configuration information about multiple control resource sets (CORESETs) and search spaces from a base station, allowing for repeated transmission of PDCCHs with identical downlink control information (DCI) across different time-frequency domains, and transmitting HARQ-ACK information to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH is transmitted using single transmission method, then device complexity is reduced, but reliability of control channel reception deteriorates
Solution Approach 1:
The control channel transmission is segmented into multiple PDCCH transmissions carrying the same DCI. The terminal receives and combines multiple PDCCH instances to improve reception reliability. This segmentation allows the system to achieve higher reliability without requiring complex modulation or coding schemes, as the redundancy is achieved through repeated transmissions rather than complex error correction mechanisms.
Solution Approach 2:
The system employs periodic repetition of PDCCH transmissions at predetermined intervals. The terminal is configured to receive PDCCH repeatedly according to a periodic pattern, where each repetition carries identical downlink control information. This periodic action ensures that if one transmission is missed or corrupted, subsequent repetitions provide additional opportunities for successful reception, thereby improving reliability while maintaining relatively simple device complexity.
2Reliability
If multiple PDCCH transmissions are used for same DCI, then reliability of data transmission is improved, but resource consumption increases
Solution Approach 1:
Multiple PDCCH transmissions carrying the same DCI are merged into a unified reception process at the terminal. The terminal combines the information from multiple PDCCH instances to achieve more reliable decoding. By merging the redundant information from multiple transmissions rather than treating them as separate resources, the system improves reliability while minimizing the actual resource consumption that would occur if multiple different DCIs were transmitted.
Solution Approach 2:
The system creates copies of the same DCI information across multiple PDCCH transmissions rather than transmitting unique information in each transmission. These copies are identical repetitions of the control information, allowing the terminal to select or combine the most reliable copy. This copying approach ensures reliability through redundancy while efficiently utilizing resources by avoiding the transmission of multiple different data sets.
3Length of stationary object
If repeated PDCCH transmission is implemented, then coverage of control channel is extended, but transmission time increases
Solution Approach 1:
The system performs preliminary configuration of the terminal with repetition parameters before actual PDCCH transmission begins. The terminal is pre-configured with information about the number of repetitions, timing patterns, and resource allocations. This preliminary action allows the repeated transmissions to proceed efficiently without requiring real-time negotiation or adjustment, thereby extending coverage through multiple transmissions while minimizing the time lost to coordination overhead.
Data Source
AI summary
A method, which is performed by a terminal, for receiving a Physical Downlink Control Channel (PDCCH) in a wireless communication system comprises the steps of: receiving, from a base station, configuration information about a first control resource set (CORESET); receiving, from the base station, configuration information about a second CORESET; receiving, from the base station, a first PDCCH transmitted on the first CORESET; and receiving, from the base station, a second PDCCH transmitted on the second CORESET.