Terminal Device PUSCH Transmission Timing in Special Subframes
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Solution Overview
Problem
Current LTE communication systems face inefficiencies in uplink signal transmission, particularly in utilizing PUSCH in special subframes, which affects the communication efficiency between terminal apparatuses and base station apparatuses.
Innovation Solution
The implementation of a method that allows for the efficient use of PUSCH in special subframes by configuring the Uplink Pilot Time Slot (UpPTS) and managing the transmission of SRS and PUSCH based on specific parameters, enabling flexible subframe allocation for PUSCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUSCH is transmitted in UpPTS of special subframe to enhance uplink capacity, then uplink throughput is improved, but transmission reliability deteriorates due to timing synchronization issues
Solution Approach 1:
The terminal performs timing adjustment based on downlink timing before PUSCH transmission in UpPTS. The terminal calculates timing offset from downlink subframe timing and applies preliminary timing alignment to ensure synchronized transmission, preventing uplink-downlink interference while maintaining enhanced uplink capacity.
Solution Approach 2:
The invention changes the timing parameter of PUSCH transmission by adjusting the start time based on downlink timing reception. The terminal dynamically adjusts transmission timing parameters to align with the special subframe structure, ensuring reliable transmission while utilizing UpPTS for capacity enhancement.
2Productivity
If PUSCH transmission is allowed in special subframe, then uplink resource utilization is improved, but signal interference increases due to proximity with downlink signals
Solution Approach 1:
The terminal performs preliminary timing adjustment using downlink timing references before transmitting PUSCH in UpPTS. This advance timing alignment ensures that uplink transmission starts at the correct time, avoiding overlap with downlink signals and eliminating interference while maximizing resource utilization.
Solution Approach 2:
The downlink timing signal acts as an intermediary reference that the terminal uses to synchronize uplink transmission timing. By using the received downlink timing as a reference point, the terminal can precisely schedule PUSCH transmission to avoid interference with downlink signals while utilizing the UpPTS resources.
Data Source
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AI summary
A terminal apparatus (1) and a base station apparatus (3) efficiently communicate with each other by using an uplink signal. The terminal apparatus (1) receives information for indicating a configuration of an added UpPTS, transmits an SRS and a PUSCH, and transmits capability information used for individually indicating (i) whether the terminal apparatus (3) supports the SRS transmission in the added UpPTS included in a special subframe, and (ii) whether the terminal apparatus (3) supports the PUSCH transmission in the added UpPTS included in the special subframe.