Cell Handover Uplink Grant Scheduling Without Random Access
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Solution Overview
Problem
Existing communication systems in LTE face challenges in efficiently handing over a terminal apparatus from a source cell to a target cell without performing a random access procedure and allocating an uplink grant in advance, leading to inefficiencies in communication continuity.
Innovation Solution
A terminal apparatus and base station apparatus implementation that enables efficient handover by utilizing carrier aggregation, time division duplex, and frequency division duplex, along with advanced signaling and channel management to facilitate seamless communication through uplink grants and synchronization, allowing for simultaneous transmission and reception of multiple physical channels and signals across aggregated serving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a terminal apparatus is handed over from source cell to target cell without performing random access procedure and without allocating uplink grant in advance, then handover delay is reduced, but communication reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by allocating uplink grant resources in advance as part of the handover command before the terminal actually needs to transmit uplink data in the target cell. This pre-allocation ensures that when handover occurs, the terminal can immediately use the pre-assigned uplink resources without needing to perform random access or wait for grant allocation, thus reducing handover delay while maintaining communication reliability through guaranteed uplink resources.
2Productivity
If multiple physical channels and signals are transmitted simultaneously across aggregated serving cells, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the simultaneous transmission of multiple physical channels and signals across aggregated serving cells into separate processing stages. The terminal apparatus processes each serving cell's physical channels independently through distinct functional blocks, then combines the results. This segmented approach enables efficient multi-cell communication while managing device complexity by organizing the processing into manageable, modular components.
Data Source
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AI summary
A terminal apparatus 1 and a base station apparatus 3 efficiently continue to communicate with each other. The terminal apparatus 1 is a terminal apparatus to be handed over from a source cell to a target cell, and the terminal apparatus is handed over from the source cell to the target cell, and includes a receiver 13 configured to receive a higher layer information mobilityControlInfo including a first uplink grant and a subframe allocation information and a transmitter 13 configured to perform a transmission based on the first uplink grant in one of a plurality of subframes indicated by the subframe allocation information, wherein the subframe allocation information indicates at least one of the plurality of subframes associated with a set having the same number across radio frames.