Single DCI Scheduling for Multi-Slot Transport Blocks With Partial DMRS
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Solution Overview
Problem
Current wireless communication protocols face issues with PDCCH blocking due to a lack of available control channel elements (CCEs) and high DMRS overhead, leading to unscheduled UEs and reduced spectrum efficiency.
Innovation Solution
Implementing a single DCI message to schedule multiple transport blocks across multiple time slots with partial DMRS configurations, allowing dynamic or adaptive DMRS transmissions based on channel conditions and application requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional scheduling methods are used with full DMRS symbols in each time slot, then channel estimation accuracy is maintained, but DMRS overhead increases and spectrum efficiency decreases
Solution Approach 1:
The patent applies partial DMRS action by transmitting DMRS symbols only in selected time slots rather than every slot. The network device determines a first time slot for DMRS transmission out of multiple time slots, and the UE performs channel estimation only for those specific slots, reducing overall DMRS overhead while maintaining sufficient channel estimation accuracy for the scheduled transport blocks
Solution Approach 2:
The patent segments the channel estimation process by dividing multiple time slots into groups where only certain slots contain DMRS symbols. This segmentation allows the system to perform channel estimation selectively rather than continuously, reducing the total number of DMRS transmissions while still providing adequate channel information for data demodulation across all scheduled slots
2Adaptability or versatility
If multiple DCI messages are used to schedule transport blocks across multiple time slots, then each transport block can be individually controlled, but CCE consumption increases and PDCCH blocking occurs
Solution Approach 1:
The patent merges multiple DCI scheduling functions into a single DCI message that schedules transport blocks across multiple time slots. This single DCI message contains resource allocation information for multiple slots, reducing the total number of DCI messages and associated CCE consumption while maintaining the ability to control individual transport blocks through the unified scheduling framework
Solution Approach 2:
The single DCI message structure is designed with multi-functionality to handle scheduling across multiple time slots simultaneously. It includes field configurations that can specify resource allocations, modulation and coding schemes, and other parameters for multiple transport blocks, making one DCI message serve the function previously requiring multiple separate messages
3Reliability
If DMRS symbols are transmitted in every time slot, then channel conditions are continuously monitored, but spectrum efficiency decreases and resource utilization is reduced
Solution Approach 1:
The patent implements periodic DMRS transmission by selecting specific time slots at regular intervals rather than transmitting DMRS in every slot. The network device determines a pattern of first time slots out of multiple consecutive slots where DMRS will be transmitted, creating a periodic monitoring schedule that maintains channel condition awareness while freeing up resources in non-DMRS slots for additional data transmissions, thereby improving spectrum efficiency
Data Source
AI summary
A method for wireless communication by a user equipment (UE) includes receiving a single downlink control information (DCI) message scheduling a number of uplink transport blocks across multiple time slots. The method further includes processing the single DCI message to configure partial demodulation reference signal (DMRS) symbols across the time slots such that at least one of the time slots contains less than a quantity of previously configured DMRS symbols.