UE Uplink Grant Selection Using Logical Channel Reliability Metrics
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Solution Overview
Problem
Existing wireless communication systems face challenges in handling intra-user equipment (UE) uplink overlapping grants, particularly in 5G New Radio (NR), where conflicts arise between dynamic and configured grants, leading to inefficiencies and difficulties in distinguishing between grant cancellations due to preemption or empty buffers.
Innovation Solution
Implementing a logical channel with a reliability metric parameter to determine the appropriate grant for transmission, allowing high priority data to be transmitted with robust grants and low priority data with high spectrum efficiency, while enabling deterministic or opportunistic preemption based on grant reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic grant is used for transmission, then spectrum efficiency is improved, but reliability deteriorates
Solution Approach 1:
The patent introduces a reliability metric parameter that can be configured for different logical channels. This parameter allows the system to dynamically adjust the reliability requirements based on the type of data being transmitted. By changing this parameter, the system can determine whether to use dynamic grant (for high spectrum efficiency) or configured grant (for high reliability) based on the reliability metric configuration.
2Reliability
If configured grant is used for transmission, then reliability is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The reliability metric parameter enables the system to configure different reliability requirements for different logical channels. When the reliability metric indicates high reliability is needed, the system selects configured grant. When the reliability metric allows for lower reliability, the system switches to dynamic grant for better spectrum efficiency. This parameter-driven selection resolves the contradiction between reliability and spectrum efficiency.
3Reliability
If preemption is implemented to handle overlapping grants, then high priority data transmission reliability is improved, but system complexity increases
Solution Approach 1:
The reliability metric parameter acts as an intermediary that simplifies the preemption decision process. Instead of implementing complex preemption logic to handle all overlapping grant scenarios, the system uses the reliability metric parameter as a mediator to determine whether preemption is needed. This intermediary parameter reduces the complexity of grant handling while maintaining high priority data transmission reliability.
4Measurement precision
If reliability metric parameter is configured for each logical channel, then grant selection accuracy is improved, but configuration complexity increases
Solution Approach 1:
The reliability metric parameter provides a simple yet effective way to configure grant selection criteria for different logical channels. By changing this single parameter per logical channel, the system achieves accurate grant selection without requiring complex configuration mechanisms. The parameter's simplicity allows for easy configuration while maintaining high selection accuracy.
Data Source
AI summary
One or more methods of handling intra user equipment (UE) uplink (UL) overlapping grants. At least one of the methods includes: configuring a logical channel (LC) with a parameter defining a reliability metric associated with the LC; determining, based on the parameter, that a grant satisfies a reliability requirement; and transmitting data associated with the LC using the grant.