PDSCH Scheduling With Reused DCI Fields for Slow-Varying Channels
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Solution Overview
Problem
In 5G NR and LTE systems, network devices send downlink control information (DCI) in each slot to indicate terminal devices to receive physical downlink shared channels (PDSCH) in consecutive slots, leading to unnecessary signaling overhead due to repeated frequency domain and antenna port indication fields for slowly varying channels.
Innovation Solution
A communication method where terminal devices receive first signaling with indication information for both a first and second signal, and subsequent signaling only for the second signal, allowing them to determine the first information based on the first indication, reducing redundant signaling by reusing frequency domain resources, modulation and coding schemes, and antenna ports across consecutive slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI is sent in each slot with frequency domain resource indication field and antenna port indication field, then the terminal device can correctly receive PDSCH in consecutive slots, but signaling overhead increases due to repeated indication of same content
Solution Approach 1:
The patent applies the copying principle by reusing the frequency domain resource indication field and antenna port indication field values from the first DCI message in subsequent DCI messages. Instead of transmitting new indication values in each slot, the system copies the previously transmitted indication information, thereby reducing signaling overhead while maintaining the ability to correctly receive PDSCH in consecutive slots for terminals with slowly varying channels
Solution Approach 2:
The patent applies preliminary action by pre-configuring the frequency domain resource indication and antenna port indication in the first DCI message, and then reusing these pre-configured values in subsequent DCI messages. This preliminary configuration allows the network to reduce signaling overhead in subsequent slots while ensuring the terminal can correctly receive PDSCH without needing repeated full indication information
2Productivity
If DCI is sent in each slot to schedule PDSCH, then the terminal device can receive data in consecutive slots, but unnecessary signaling overhead increases for slowly varying channels
Solution Approach 1:
The patent reduces signaling overhead by copying the frequency domain resource indication and antenna port indication from the first DCI message and reusing them in subsequent DCI messages for consecutive slots. This copying approach eliminates redundant transmission of identical indication information while maintaining data reception efficiency for terminals with slowly varying channels
Solution Approach 2:
The patent changes the parameter transmission strategy by transitioning from transmitting complete indication fields in every DCI message to transmitting only differential or updated portions. For slowly varying channels, the system changes the indication parameters from being fully re-transmitted to being referenced from previous transmissions, thereby reducing signaling overhead while maintaining productivity
Data Source
AI summary
To resolve a problem of high signaling overheads caused by resource scheduling in a scenario in which a channel slowly varies, a terminal device receives first signaling, where the first signaling includes first indication information of first information associated with a first signal and first indication information of first information associated with a second signal. The terminal device receives second signaling, where the second signaling indicates the terminal device to receive the second signal in a second time unit, and does not include indication information of the first information associated with the second signal.