Uplink Packet Duplication Across Carriers Without SINR Loss
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Solution Overview
Problem
Uplink transmission for URLLC services faces a transmit power constraint issue due to duplicate transmissions across different carriers, leading to reduced Signal to Interference plus Noise Ratio (SINR) and increased Peak to Average Power Ratio (PAPR), which limits the maximum total transmit power of terminal devices.
Innovation Solution
The network device assigns consecutive grants from multiple carriers in sequential transmission time intervals (TTIs) or subframes, allowing terminal devices to transmit data packet duplications across different carriers without power division, thereby maintaining SINR and avoiding PAPR increases, thus enabling improved communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplicate transmissions across different carriers are performed simultaneously, then reliability is improved, but transmit power is divided leading to reduced SINR
Solution Approach 1:
The patent segments the duplicate transmissions across different time resources (TTIs) rather than transmitting them simultaneously. The network device configures the terminal to transmit duplicate data packets on different carriers in sequential TTIs, which avoids power division while maintaining frequency diversity and reliability.
2Reliability
If more concurrent multi-carrier transmission is performed, then reliability is improved, but PAPR increases reducing maximum total transmit power
Solution Approach 1:
The patent segments concurrent multi-carrier transmissions into sequential transmissions across different TTIs. By configuring duplicate packets to be transmitted on different carriers at different time intervals, the system avoids the PAPR increase that would result from simultaneous multi-carrier transmission, thereby preserving maximum total transmit power capability.
3Power
If duplicate transmissions are performed in sequential TTIs on different carriers, then SINR is improved, but frequency diversity may be reduced
Solution Approach 1:
The patent applies local quality by configuring different frequency resources (carriers) for duplicate transmissions in different TTIs. The network device can selectively assign different carriers based on channel conditions, ensuring that each transmission benefits from optimal frequency diversity while maintaining high SINR through sequential rather than simultaneous transmission.
Data Source
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AI summary
Embodiments of the disclosure generally relate to uplink transmission. A network device allocates resource regions for uplink transmission of a data packet of a terminal device. The resource regions are distributed across a plurality of carriers and correspond to consecutive transmission time intervals for transmitting the data packet. The network device transmits information about the resource regions to the terminal device to enable the terminal device to perform uplink transmission of the data packet based on the information.