NR Channel Scheduling with Dual Reference Symbol Positioning
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Solution Overview
Problem
In the New Radio (NR) system, existing methods for indicating the starting symbol position of channels in 5G face challenges with high control overhead and inefficient scheduling due to uncertainty in the location of the downlink control channel, leading to suboptimal resource allocation and increased time delay.
Innovation Solution
A method that utilizes different types of time domain symbol position information to flexibly indicate the starting symbol position of channels, using relative positions to the downlink control channel or time slot when the channel is close or far, respectively, to optimize resource allocation and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the starting symbol position of the channel is indicated based on the starting position of the time slot, then the channel can be scheduled at various positions within the time slot, but the scheduled channel cannot be located proximate to the downlink control channel, resulting in increased time delay
Solution Approach 1:
The patent introduces a new reference object (downlink control channel position) as an intermediary to indicate the starting symbol position of the scheduled channel. Instead of using the time slot starting position as the sole reference, the indication is now relative to the downlink control channel position, allowing the scheduled channel to be placed proximate to the control channel and reducing time delay.
Solution Approach 2:
The patent changes the reference parameter for indicating the starting symbol position from absolute time slot position to relative position based on downlink control channel location. This parameter change enables dynamic adjustment of the scheduled channel position according to the actual downlink control channel position, achieving both flexibility and reduced delay.
2Loss of time
If the starting symbol position of the channel is indicated based on the position of the downlink control channel to achieve proximate scheduling, then time delay is reduced, but control overhead increases dramatically when the distance exceeds 1 slot
Solution Approach 1:
The patent makes the indication mechanism dynamic by introducing a switchable parameter that adapts to different scheduling scenarios. When the scheduled channel is within 1 slot of the downlink control channel, the relative position indication is used; when it exceeds 1 slot, the system switches to using the time slot starting position as reference, thereby controlling overhead while maintaining flexibility.
Solution Approach 2:
The patent changes the reference frame parameter dynamically based on the distance between the downlink control channel and the scheduled channel. By switching between two different reference systems (downlink control channel position vs. time slot starting position), the system optimizes the balance between scheduling flexibility and control overhead.
3Adaptability or versatility
If the starting symbol position is distributed evenly within the time slot, then all positions are covered, but the scheduled channel position cannot be optimized based on downlink control channel location, reducing scheduling efficiency
Solution Approach 1:
The patent transforms the static even distribution of starting symbol positions into a dynamic selection mechanism. Instead of pre-distributing positions evenly, the system dynamically selects the starting symbol position based on the actual downlink control channel location, enabling optimized scheduling while maintaining comprehensive coverage.
Data Source
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AI summary
Embodiments of the present application relates to a method, terminal device and network device for transmitting channels. The method includes: receiving at least one time domain symbol position information transmitted by the network device, where time domain symbol position information for the first type is used for indicating a relative position between the starting time domain symbol occupied by the channel to be scheduled and time slot where the channel to be scheduled is located, and time domain symbol position information for the second type is used for indicating a relative position between the starting time domain symbol occupied by the channel to be scheduled and time domain resources where target control information is located; determining a type of target time domain symbol position information in the at least one time domain symbol position information and then determining a position of the starting time domain symbol occupied by the channel to be scheduled and indicated by the target time domain symbol position information, and transmitting the channel to be scheduled according to the position. The method, terminal device and network device for transmitting channels in the embodiment of the present application can fully utilize the limited control signaling overhead to effectively indicate the starting symbol position of the channel to be scheduled.