Frequency-Domain Resource Allocation for Short TTI Transmission
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Solution Overview
Problem
In communication systems, particularly in LTE networks, there is a challenge in efficiently utilizing resources to minimize transmission delay while ensuring compatibility with existing systems, as shorter Transmission Time Intervals (TTIs) lead to resource wastage due to overlapping time units and inefficient scheduling of physical channels.
Innovation Solution
A method where a terminal device determines frequency-domain resources for both shorter and longer TTIs, allowing the reuse of resources to maximize availability and minimize waste by allocating part of the second TTI's resources to support the first TTI's physical channel transmission, with configuration information and re-sequencing of PRBs to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If shorter TTI is used to reduce transmission delay, then transmission delay is reduced, but resource utilization deteriorates due to overlapping time units and inefficient scheduling
Solution Approach 1:
The patent implements dynamic resource allocation where the network device dynamically determines the third frequency-domain resource by combining first and second frequency-domain resources. This dynamic approach allows the system to adapt resource allocation to actual transmission needs, enabling shorter TTI for time-critical data while efficiently utilizing available resources through flexible scheduling, thereby reducing transmission delay without causing resource wastage.
Solution Approach 2:
The patent makes frequency-domain resources universal by allowing the same resources to serve multiple purposes. The third frequency-domain resource can simultaneously support transmission of the first physical channel in the first target time unit and the second physical channel in the second target time unit. This multi-functionality enables efficient resource utilization while accommodating both short TTI and longer TTI requirements.
2Loss of time
If shorter TTI is used to reduce transmission delay, then transmission delay is reduced, but scheduling complexity increases due to overlapping time units
Solution Approach 1:
The patent segments the frequency-domain resources into distinct components: first frequency-domain resource for the first physical channel, second frequency-domain resource for the second physical channel, and third frequency-domain resource that combines both. This segmentation allows the network device to independently manage and schedule each resource type while maintaining overall coordination, reducing scheduling complexity despite the use of shorter TTI and overlapping time units.
Solution Approach 2:
The network device acts as an intermediary that coordinates between the first and second physical channel transmissions. It determines the third frequency-domain resource by combining resources from both channels and provides configuration information to the terminal device. This intermediary role simplifies the scheduling process by centralizing resource management and providing clear allocation instructions, thereby reducing complexity.
3Adaptability or versatility
If resources are allocated for both first and second physical channels, then transmission flexibility is improved, but resource waste occurs due to overlapping time units
Solution Approach 1:
The patent merges the first frequency-domain resource and second frequency-domain resource to form the third frequency-domain resource. This combining allows the system to allocate resources flexibly for both physical channels while avoiding waste. The network device can determine the third frequency-domain resource to include at least part of the second frequency-domain resource, ensuring efficient utilization of available resources while maintaining transmission flexibility for both channels.
Solution Approach 2:
The patent implements resource recovery by allowing the third frequency-domain resource to include at least part of the second frequency-domain resource even when the second physical channel is transmitted in an overlapping time unit. This approach recovers resources that would otherwise be wasted due to the overlap, while still maintaining the flexibility to allocate resources for both physical channels as needed.
Data Source
AI summary
Provided in the embodiments of the present invention are a communications method, a terminal device, and a network device. The method comprises: a terminal device determining a first frequency-domain resource, said first frequency-domain resource being a usable resource preconfigured to support the use of a first TTI to transmit a first physical channel in a first target time unit, and the length of time of the first TTI being equal to the length of time of the first target time unit; a terminal device determining a second frequency-domain resource, said second frequency-domain resource being determined to be used for using a second TTI to transmit a second physical channel in a second target time unit, the second TTI being not smaller than the first TTI and the second target time unit at least partially overlapping with the first target time unit; a terminal device determining a third frequency-domain resource, the third frequency-domain resource containing at least part of the frequency-domain resource of the second frequency-domain resource, and said third frequency-domain resource being a maximum usable frequency-domain resource supporting the use of a first TTI to transmit a first physical channel in a first target time unit. The embodiments of the present disclosure increase resource utilization.