Uplink Transmission Power Efficiency via Sub-frame Mapping
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Solution Overview
Problem
In satellite communication and other scenarios, the low signal-to-noise ratio due to restricted uplink transmit power results in low spectrum and transmission efficiency, with existing solutions either requiring repeated transmissions or dividing data packets, leading to increased overhead and inefficient use of resources.
Innovation Solution
A method where user equipment maps complex data symbols onto multiple sub-frames, increasing total transmit power by extending signals in the time domain, allowing correct data reception while improving spectrum and transmission efficiency through concurrent transmission of multiple user equipment signals using FDMA and CDMA schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are transmitted repeatedly in time domain, then the base station can demodulate correctly by integrating received data, but the spectrum efficiency is low because the occupied PRB cannot be reused by another user equipment
Solution Approach 1:
The patent divides the data packet into multiple code blocks and transmits them across multiple sub-frames with different encoding rates. This segmentation allows the system to balance reliability (through multiple transmissions) and spectrum efficiency (by allowing PRB reuse in the meantime), resolving the contradiction between demodulation correctness and spectrum efficiency.
2Reliability
If data packets are divided into small packets transmitted in multiple sub-frames, then the encoding rate is lowered and demodulation is correct, but additional overhead such as MAC header and CRC bits greatly increases total overhead and lowers transmission efficiency
Solution Approach 1:
The patent applies partial repetition by transmitting only certain code blocks repeatedly across sub-frames while using different encoding rates, rather than dividing the entire packet into small units. This approach achieves reliable demodulation through selective retransmission without adding excessive overhead for multiple small packet headers and CRC bits.
3Speed
If high encoding rate is used to transmit 224 bits in one TTI, then transmission is fast, but the received signal-to-noise ratio is lower than the demodulation threshold
Solution Approach 1:
The patent dynamically adjusts the encoding rate for different code blocks across multiple sub-frames. By using higher encoding rates for some transmissions and lower encoding rates for others, the system achieves both fast transmission (maintaining overall speed) and reliable demodulation (ensuring sufficient signal-to-noise ratio through lower encoding rates in certain sub-frames).
Data Source
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AI summary
The embodiments of the present invention relate to the technical field of wireless communications, and in particular, to a method, system and device for performing uplink transmission, which are used for solving the problems existing in the prior art that the spectrum efficiency and transmission efficiency are relatively low when the uplink transmission is performed in the case that the uplink transmission power is limited. The method of the embodiments of the present invention comprises: user equipment mapping complex symbol data obtained by modulation mapping to Q sub-frames, where Q is a positive integer; the user equipment modulating the complex symbol data mapped to each sub-frame, respectively, so as to generate sending signals corresponding to each sub-frame; and the user equipment sending the sending signals over the corresponding sub-frames. Since the embodiments of the present invention map the data in a data packet into a plurality of sub-frames for transmission, the total transmission power of the user equipment can be correctly received, therby improving the spectrum efficiency and transmission efficiency when the uplink transmission is performed in the case that the uplink transmission power is limited.