Grant-Free Uplink Transmission Collision Reduction via Logical Channel Prioritization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communications, the lack of dynamic scheduling for user equipment (UE) leads to increased collision rates and degraded transmission reliability and latency in uplink grant-free transmission, particularly in New Radio (NR) systems, where multiple UEs share pre-configured radio resources, causing conflicts and reducing service quality for ultra-reliable and low-latency communications (URLLC) services.
Innovation Solution
Implementing a method where user equipment (UE) receives a configured grant and selects an allowed logical channel to schedule and transmit uplink data, with the network apparatus pre-configuring specific radio resources, allowing only critical data to use configured grants while non-critical data uses dynamic grants, thereby minimizing collisions and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple UEs share pre-configured radio resources for grant-free transmission, then transmission latency is reduced, but collision rate increases
Solution Approach 1:
The patent changes the parameter of resource allocation from static shared resources to dynamic dedicated resources. When collision is detected or for high-priority data, the system transitions from grant-free transmission to dynamic grant-based transmission, effectively changing the resource allocation parameter to resolve the contradiction between low latency and low collision rate.
Solution Approach 2:
The patent introduces dynamic switching between two transmission modes: grant-free transmission for normal conditions and dynamic grant-based transmission for collision-prone or high-priority scenarios. This dynamic adaptation allows the system to optimize between latency and collision rate based on real-time conditions.
2Productivity
If more UEs use contention-based grant-free transmission, then resource utilization improves, but transmission reliability degrades
Solution Approach 1:
The patent segments the uplink transmission resources into two distinct paths: grant-free resources for general traffic and dynamic grant resources for collision resolution or high-priority traffic. This segmentation allows the system to maintain high resource utilization while providing a reliable fallback path when collisions occur.
Solution Approach 2:
The network apparatus acts as an intermediary by monitoring collision conditions and dynamically allocating grants to resolve conflicts. When collisions are detected, the network intervenes by providing dedicated grants to the affected UEs, thereby maintaining overall system reliability without sacrificing resource utilization.
3Speed
If all data types use configured grants, then transmission speed increases, but collision probability increases
Solution Approach 1:
The patent applies different transmission qualities to different data types or different transmission occasions. Critical data or data experiencing collisions use dynamic grants with higher reliability, while non-critical data continues to use grant-free transmission for speed. This local differentiation resolves the contradiction by optimizing each data stream according to its requirements.
Data Source
AI summary
Various solutions for transmission without dynamic scheduling with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a configured grant. The apparatus may select an allowed logical channel to use the configured grant. The apparatus may schedule uplink data from the allowed logical channel to a protocol data unit (PDU). The apparatus may transmit the PDU on the configured grant.