Uplink Grant Timing Across RF Carriers for UE Preparation
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining optimal preparation times for uplink transmissions on multiple radio frequency carriers, leading to inefficiencies in resource allocation and potential delays in UE preparation for transmission modes.
Innovation Solution
A method and device for determining a maximum preparation time based on the longest of two preparation times for different RF carriers, or adjusting preparation times based on channel state information, to ensure the UE is adequately prepared for uplink transmissions, including configuring components to process grants within the determined time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the preparation time for uplink transmissions is determined based on multiple RF carriers, then the reliability of transmission scheduling is improved, but the device complexity increases due to the need to determine and compare multiple preparation times
Solution Approach 1:
The system determines preparation times for different RF carriers in advance and establishes a maximum preparation time before actual transmission scheduling occurs. This preliminary determination of preparation times (N2 values) for multiple carriers allows the base station to reliably schedule uplink transmissions without real-time calculation complexity, as the preparation time requirements are pre-established for each carrier configuration
Solution Approach 2:
Instead of determining the minimum preparation time sufficient for transmission, the system determines the maximum preparation time required among all configured RF carriers and uses this as the scheduling basis. This inversion approach ensures that by planning for the worst-case (maximum) preparation time scenario, all transmission scheduling decisions become reliably valid across all carriers without needing complex per-carrier real-time analysis
2Reliability
If the grant is transmitted earlier to allow sufficient preparation time, then the UE preparation reliability is improved, but the loss of time for resource allocation increases
Solution Approach 1:
The system dynamically adjusts the preparation time parameter (N2) based on the specific RF carrier configuration and transmission mode. By changing the preparation time parameter to match the actual requirements of different carriers and transmission scenarios, the system ensures adequate UE preparation time while avoiding excessive early grant transmission that would waste resource allocation time. The parameter is adapted to balance reliability and timing efficiency
Data Source
AI summary
A base station (BS) may determine (estimate) a preparation time for at least one uplink (UL) transmission by a user equipment (UE) on at least one radio frequency (RF) carrier. The BS may determine the preparation time so that the BS will send a grant for the at least one transmission to the UE a sufficient amount of time (based on the estimated preparation time) before the at least one transmission is scheduled to occur to enable the UE to conduct the at least one UL transmission on a selected one of the RF carriers or on both RF carriers. The BS may select the longest preparation time from the preparation times of different RF carriers. The BS may select the subcarrier spacing (SCS) index from the SCS indexes for different RF carriers that provides a longer preparation time. The BS may add a defined value to a preparation time.