Virtual PUSCH Segmentation for Reliable Uplink DMRS Positioning
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Solution Overview
Problem
Conventional wireless communication systems struggle to meet coverage requirements for uplink transmission of low-latency and high-reliability services, particularly in scenarios where the transmission time is short, due to limitations in determining demodulation reference signal locations when PUSCH crosses slot boundaries or includes invalid symbols.
Innovation Solution
The solution involves dividing uplink transmissions into multiple virtual PUSCHs based on time-domain parameters, determining valid symbols, and adjusting demodulation reference signal positions to ensure effective coverage and reliability, even when the transmission crosses slot boundaries or includes invalid symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If uplink transmission is performed with short transmission time to meet low-latency requirements, then latency is reduced, but coverage and reliability deteriorate due to insufficient time for effective signal transmission and demodulation reference signal positioning
Solution Approach 1:
The uplink transmission is divided into multiple virtual PUSCHs when the transmission time is shorter than the threshold, allowing the system to process and position demodulation reference signals for each virtual PUSCH separately, thereby improving coverage and reliability without increasing overall latency
Solution Approach 2:
The system changes the parameter of transmission time by comparing it against a threshold and dynamically adjusting the transmission strategy - using virtual PUSCH division when time is insufficient and conventional methods when time is adequate, thus optimizing both latency and reliability based on actual conditions
2Device complexity
If demodulation reference signals are positioned according to conventional methods, then the signaling process is simple, but coverage requirements cannot be met when PUSCH crosses slot boundaries or includes invalid symbols
Solution Approach 1:
When PUSCH crosses slot boundaries or contains invalid symbols, the transmission is segmented into virtual PUSCHs, and demodulation reference signal positions are determined separately for each segment, ensuring reliable coverage without overwhelming complexity
Solution Approach 2:
The system dynamically adjusts the demodulation reference signal positioning strategy based on whether the PUSCH crosses slot boundaries or includes invalid symbols, using conventional positioning when conditions permit and virtual PUSCH-based positioning when conditions require, thus balancing complexity and reliability
Data Source
AI summary
Systems and methods for wireless communications are disclosed herein. Example implementations include a wireless communication method of dividing, by a wireless communication device, an uplink transmission into a plurality of virtual uplink transmissions based on one or more time-domain parameters, and determining, by the wireless communication device for each of the plurality of virtual uplink transmissions, respective time-domain positions of one or more demodulation reference signals. Example implementations also include a wireless communication method of determining, by a wireless communication device, a number of valid symbols for an uplink transmission, and determining, by the wireless communication device for the uplink transmission, respective time-domain positions of one or more demodulation reference signals.