Multi-Carrier Uplink Grant Timing 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
The method involves determining a maximum preparation time based on the longest of two preparation times for different RF carriers, adjusting preparation times based on channel state information, and using subcarrier spacing indices to ensure timely resource allocation for uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a base station schedules uplink transmissions on multiple RF carriers, then resource allocation efficiency is improved, but determining optimal preparation times becomes more complex and may cause delays
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the preparation time parameter based on the number of RF carriers and transmission modes. The base station determines a maximum preparation time from multiple candidate preparation times associated with different RF carriers and transmission mode configurations, then uses this maximum value to schedule grants. This allows the system to adapt the preparation time parameter to match the complexity of multi-carrier operations, resolving the contradiction between improved resource allocation efficiency and increased determination complexity.
2Reliability
If the base station transmits grants earlier to allow UE preparation, then transmission reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamics by making the grant transmission timing flexible rather than fixed. The base station determines a maximum preparation time based on the specific combination of RF carriers and transmission modes, then transmits grants exactly this amount of time before the scheduled uplink transmission. This dynamic adjustment ensures grants are transmitted early enough for reliable UE preparation while minimizing idle time and maximizing resource utilization efficiency.
3Adaptability or versatility
If the UE switches between different transmission modes on multiple carriers, then transmission versatility is improved, but preparation time requirements increase
Solution Approach 1:
The patent applies preliminary action by having the base station determine and communicate the maximum preparation time in advance, before the UE actually performs the transmission mode switching. The base station calculates this maximum time based on the specific RF carriers and transmission modes involved, then schedules grants accordingly. This allows the UE to prepare for mode switching ahead of time without experiencing delays, resolving the contradiction between transmission versatility and preparation time requirements.
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.