Terminal and Base Station Uplink Scheduling in Shared Bands
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Solution Overview
Problem
LTE systems are not designed for uplink transmission using non-allocated or shared frequency bands, limiting their utilization in communication systems.
Innovation Solution
A terminal apparatus and base station apparatus are developed to efficiently manage and utilize non-allocated or shared frequency bands for uplink transmission by implementing specific scheduling and resource allocation techniques, enabling efficient communication in heterogeneous networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE systems use non-allocated or shared frequency bands for uplink transmission, then frequency band utilization is improved, but system reliability deteriorates due to lack of design support
Solution Approach 1:
The patent introduces a base station as an intermediary that coordinates uplink transmission timing between LTE systems and other radio access systems. The base station receives timing information from other systems, determines appropriate uplink transmission timing, and controls terminal transmission accordingly. This intermediary mechanism enables shared frequency band usage while maintaining system reliability through centralized coordination.
2Productivity
If LTE systems share frequency bands with other radio access systems, then spectrum efficiency is improved, but interference management complexity increases
Solution Approach 1:
The base station serves as a mediator that receives timing information from other radio access systems operating in shared frequency bands. It processes this information and determines appropriate uplink transmission timing for LTE terminals, thereby simplifying interference management by centralizing the coordination function rather than requiring complex distributed interference avoidance mechanisms.
Solution Approach 2:
The system performs preliminary timing coordination by having the base station determine uplink transmission timing in advance based on timing information from other radio access systems. This preliminary action allows LTE uplink transmissions to be scheduled proactively to avoid conflicts with other systems, improving spectrum efficiency while managing interference complexity through advance planning.
Data Source
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AI summary
The present invention relates to a terminal apparatus and a base station apparatus that enable efficient communication. To perform efficient uplink transmission by using a non-allocated frequency band or a shared frequency band. A terminal apparatus includes a reception unit configured to receive a message of terminal capability enquiry and a transmission unit that transmits terminal capability information in a case that the message has been received. In a case that the terminal capability information includes first information indicating that uplink LAA is supported, the transmission unit transmits a first PUSCH of a first resource allocation type or a second resource allocation type in a cell that is other than an LAA secondary cell, whereas in the LAA secondary cell, transmits a second PUSCH of a third resource allocation type.