Preconfigured Grants Distribution Pattern for URLLC
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Solution Overview
Problem
Current pre-configured grants in wireless communication systems for Ultra-Reliable Low-Latency Communications (URLLC) often result in wasted resources due to sporadic traffic patterns, as they consume dedicated uplink resources that are not shared, leading to inefficiencies and increased latency.
Innovation Solution
Implementing a method that assigns pre-configured grants with a distribution pattern across multiple time-frequency resource pools, allowing wireless devices to utilize different shared resource pools in a cyclic manner, dynamically reconfiguring distribution patterns and sizes to reduce frequency selective fading and collisions, and reverting to dynamic grants in case of high collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If pre-configured grants are assigned to wireless devices for URLLC, then latency is reduced by skipping scheduling requests, but dedicated uplink resources are wasted due to sporadic traffic patterns
Solution Approach 1:
The patent merges multiple resource pools into a shared resource pool where multiple wireless devices can contend for resources. Instead of dedicating separate resources to each device, the system combines resources that can be dynamically shared, reducing waste while maintaining low latency through pre-configuration.
Solution Approach 2:
The patent introduces dynamic resource allocation within pre-configured grants. Resources are not statically assigned but dynamically allocated based on actual traffic needs, allowing the system to adapt to sporadic traffic patterns and reduce resource waste while maintaining the low-latency benefits of pre-configuration.
2Loss of time
If dedicated uplink resources are assigned to wireless devices, then latency is reduced, but resource sharing efficiency deteriorates
Solution Approach 1:
The patent makes uplink resources universal by creating a shared resource pool that can be used by multiple wireless devices for different purposes. The same resources serve multiple functions and multiple devices, improving sharing efficiency while maintaining the low-latency characteristics needed for URLLC.
Solution Approach 2:
The system dynamically allocates shared resources to different wireless devices based on instantaneous traffic demands, allowing resources to be flexibly reassigned. This dynamic approach enables efficient resource sharing while maintaining the rapid access capabilities required for low-latency URLLC communications.
3Loss of time
If pre-configured grants are used for sporadic traffic, then latency requirements are met, but collision probability increases
Solution Approach 1:
The patent implements feedback mechanisms where the network node monitors resource usage and collision patterns in the shared resource pool. Based on this feedback, the system dynamically adjusts resource allocation and distribution patterns, reducing collision probability while maintaining the low-latency benefits of pre-configured grants for URLLC traffic.
Data Source
AI summary
Methods, a network node and a wireless device for implementing pre-configured grants with a hopping pattern in a wireless communication system are disclosed. According to one aspect, a method in a network node for scheduling uplink transmissions for at least one wireless device is provided. The method includes defining a set of time-frequency uplink distribution patterns utilizing preconfigured grants of time-frequency resources for the at least one wireless device. The method also includes assigning to a first wireless device of the at least one wireless device a first time-frequency uplink distribution pattern from the set.