DFT-S-OFDM Uplink Waveform Selection for Single-CC Carrier Aggregation
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Solution Overview
Problem
In carrier aggregation scenarios, terminal devices at mid-near points of a network's coverage area use CP-OFDM for uplink transmission, despite DFT-S-OFDM offering lower maximum power reduction (MPR), resulting in lower data transmission rates.
Innovation Solution
Send first indication information to terminal devices to use DFT-S-OFDM waveform and higher-order modulation schemes like 16 QAM or 64 QAM for uplink transmission when a single uplink CC is used, ensuring contiguous resource blocks and appropriate power reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal device uses CP-OFDM waveform for uplink transmission in carrier aggregation scenario with single uplink CC, then data transmission rate is improved, but maximum power reduction increases
Solution Approach 1:
The patent implements dynamic waveform selection by enabling terminal devices to adaptively switch between CP-OFDM and DFT-S-OFDM waveforms based on real-time channel conditions and network configuration. The network device sends indication information to dynamically control the waveform type, allowing the system to optimize between data rate and power reduction characteristics depending on the operational scenario
Solution Approach 2:
The patent changes the waveform parameter from fixed to variable by introducing network-controlled waveform selection. The network device can configure the terminal to use different waveforms (CP-OFDM or DFT-S-OFDM) by sending indication information, thereby changing the fundamental transmission parameter to achieve optimal performance for different scenarios
2Loss of energy
If terminal device uses DFT-S-OFDM waveform for uplink transmission, then maximum power reduction decreases, but data transmission rate deteriorates
Solution Approach 1:
The system dynamically selects between DFT-S-OFDM and CP-OFDM waveforms based on terminal location and channel conditions. Terminal devices at mid-near points can dynamically switch to DFT-S-OFDM to benefit from lower power reduction, while devices at far points use CP-OFDM for better coverage, making the power reduction characteristic adaptive rather than static
Solution Approach 2:
The waveform type parameter is changed from fixed to controllable, allowing the network to configure terminals to use DFT-S-OFDM when low power reduction is desired. The indication information mechanism enables flexible parameter adjustment to achieve optimal power efficiency
3Productivity
If higher-order modulation scheme like 16 QAM or 64 QAM is used with DFT-S-OFDM waveform, then data transmission rate is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic modulation scheme selection where the network device configures the terminal to use different modulation orders (16 QAM, 64 QAM, or higher) based on channel conditions. The indication information enables adaptive adjustment of modulation complexity to match the current transmission environment
Solution Approach 2:
The modulation order parameter is changed from fixed to variable, allowing the system to adjust the complexity of the modulation scheme. The network can configure higher-order modulations (16 QAM, 64 QAM) when channel conditions permit, thereby changing the system parameter to achieve higher data rates
Data Source
AI summary
This application provides a communication method, apparatus, and system, to increase a data transmission rate of a terminal device using a DFT-S-OFDM waveform when a single uplink CC is used in a CA scenario. The communication method, apparatus, and system may be applied to a 5G system, a future communication system such as a 6G system, and other fields. The method includes: sending first indication information to the terminal device when a first condition is satisfied, and receiving data from the terminal device by using the DFT-S-OFDM waveform and a first modulation scheme. The first condition includes: There is one component carrier used by the terminal device to perform uplink data transmission in the carrier aggregation CA scenario. The CA scenario includes that CA is configured for uplink and/or CA is configured for downlink. The first indication information indicates to use the DFT-S-OFDM waveform and the first modulation scheme to perform uplink transmission. The first modulation scheme includes 16 quadrature amplitude modulation QAM or 64 QAM.