Grant-Free Uplink Adaptation via UE Indication Signals
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Solution Overview
Problem
In grant-free wireless networks, there is a lack of clear methods for UEs and access points to adapt to changing transmission conditions, such as channel quality and mobility, and to communicate these adaptations effectively, leading to inefficiencies like collisions and suboptimal resource utilization.
Innovation Solution
The method involves the UE making measurements and adapting its uplink transmission parameters based on assumed channel conditions, and communicating these adaptations to the access point through indication signals, which can request or initiate reconfigurations of transmission schemes, power control, and resource allocation, using RRC or L1 signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If grant-free transmission is used to reduce signaling overhead and latency, then transmission speed and efficiency are improved, but the ability to adapt to changing channel conditions and mobility deteriorates
Solution Approach 1:
The UE autonomously adapts its uplink transmission parameters (such as MCS, packet size, segmentation, resource selection, numerology, and power control) based on measurements of channel conditions and mobility, without requiring explicit network commands for each adaptation. This self-service mechanism enables rapid adaptation while maintaining the grant-free low-latency advantage.
Solution Approach 2:
The system implements feedback mechanisms where the UE measures channel quality and mobility conditions, then uses indication signals to communicate adaptation needs to the network. The network provides configuration information that guides the UE's adaptation decisions, creating a closed-loop feedback system that enables dynamic adaptation without traditional scheduling grants.
2Reliability
If UE autonomously adapts transmission parameters to changing conditions, then transmission reliability is improved, but signaling complexity and coordination requirements increase
Solution Approach 1:
The UE changes transmission parameters (MCS, packet size, segmentation, resource selection, numerology, power control) based on measured channel conditions and mobility. These parameter changes are driven by predefined rules and configuration information from the network, allowing reliable adaptation without complex real-time coordination.
Solution Approach 2:
The system transitions from static preconfigured parameters to dynamic adaptation where the UE continuously adjusts transmission parameters based on current channel conditions and mobility. This dynamic behavior is enabled through measurement-based adaptation rules and indication signals that coordinate changes without requiring complex real-time signaling.
3Productivity
If multiple UEs use preconfigured resources simultaneously, then resource utilization efficiency is improved, but collision probability increases
Solution Approach 1:
The system enables dynamic resource selection where UEs can adaptively choose from multiple preconfigured resource groups based on current conditions. This dynamic resource allocation allows multiple UEs to share preconfigured resources efficiently while reducing collisions through adaptive resource selection rather than fixed assignments.
Solution Approach 2:
Different UEs can be assigned different preconfigured resource groups or different adaptation rules based on their specific channel conditions, mobility patterns, and service requirements. This local customization of resource allocation improves overall resource utilization while minimizing collisions through differentiated resource usage patterns.
Data Source
AI summary
An embodiment method for transmission adaptation includes sending, by an access point, to a UE, an indication of a configuration or a reconfiguration of at least one UE uplink transmission parameter for grant-free uplink transmissions, wherein the at least one UE uplink transmission parameter includes at least one of a transmission resource and a transmission scheme; and receiving, by the access point, a UE uplink packet transmission that includes at least one configured or reconfigured transmission parameter.