Dynamic Modulation Switching for Bandwidth and Power Trade-offs
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Solution Overview
Problem
Mobile communication systems face challenges in increasing communication bandwidth while reducing capital investment and operating expenses, as well as conserving battery power in mobile devices.
Innovation Solution
A mobile communication device employing a transceiver that switches between SC-FDMA and MIMO-OFDM modulation modes based on requested bandwidth and battery charge level, using a control unit to manage communication with a base station, which includes detectors for decoding and a management unit for frequency and time allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MIMO-OFDM modulation is used to increase communication bandwidth, then the available communication bandwidth increases, but the power consumption of the mobile device increases
Solution Approach 1:
The patent implements dynamic modulation mode selection where the mobile device switches between SC-FDMA and MIMO-OFDM modes based on real-time conditions. The control unit monitors battery charge levels and requested bandwidth, then dynamically selects the appropriate transmission mode. This resolves the contradiction by making bandwidth acquisition conditional on power availability, allowing high bandwidth only when power permits.
Solution Approach 2:
The patent changes the modulation parameter (SC-FDMA vs MIMO-OFDM) based on battery charge level thresholds. When battery charge is above the threshold and high bandwidth is needed, MIMO-OFDM is selected. When battery charge falls below the threshold, the system switches to SC-FDMA to conserve power. This parameter change resolves the contradiction by adapting bandwidth usage to power availability.
2Quantity of substance
If MIMO-OFDM modulation is used to increase communication bandwidth, then the available communication bandwidth increases, but the complexity of the base station increases
Solution Approach 1:
The patent implements dynamic modulation mode selection where the mobile device switches between SC-FDMA and MIMO-OFDM modes based on real-time conditions. The control unit monitors battery charge levels and requested bandwidth, then dynamically selects the appropriate transmission mode. This resolves the contradiction by making bandwidth acquisition conditional on power availability, allowing high bandwidth only when power permits.
Solution Approach 2:
The patent changes the modulation parameter (SC-FDMA vs MIMO-OFDM) based on battery charge level thresholds. When battery charge is above the threshold and high bandwidth is needed, MIMO-OFDM is selected. When battery charge falls below the threshold, the system switches to SC-FDMA to conserve power. This parameter change resolves the contradiction by adapting bandwidth usage to power availability.
3Use of energy by moving object
If SC-FDMA modulation is used to reduce power consumption, then the power consumption decreases, but the available communication bandwidth is limited
Solution Approach 1:
The patent implements dynamic modulation mode selection where the mobile device switches between SC-FDMA and MIMO-OFDM modes based on real-time conditions. The control unit monitors battery charge levels and requested bandwidth, then dynamically selects the appropriate transmission mode. This resolves the contradiction by making bandwidth acquisition conditional on power availability, allowing high bandwidth only when power permits.
Solution Approach 2:
The patent changes the modulation parameter (SC-FDMA vs MIMO-OFDM) based on battery charge level thresholds. When battery charge is above the threshold and high bandwidth is needed, MIMO-OFDM is selected. When battery charge falls below the threshold, the system switches to SC-FDMA to conserve power. This parameter change resolves the contradiction by adapting bandwidth usage to power availability.
4Use of energy by moving object
If the transceiver operates in receive mode to conserve transmitter power, then the power consumption decreases, but the communication functionality is reduced
Solution Approach 1:
The patent implements a multi-functional transceiver that can operate in multiple modes: receive mode, first transmit mode (SC-FDMA), and second transmit mode (MIMO-OFDM). The control unit intelligently selects the appropriate mode based on battery charge levels and communication requirements. This resolves the contradiction by providing universal communication functionality across different power states, ensuring the device can adapt its capabilities to available power while maintaining necessary communication functions.
Data Source
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AI summary
A system for mobile communication includes a mobile communication device (104) that has a first plurality of antennas (120-124) and a transmitter (136). The transmitter, in response to a requested bandwidth for a first packet not being greater than a bandwidth of a first transmit mode, is configured to encode and transmit the first packet from the first plurality of antennas. The first packet has a single-carrier frequency-division-multiple-access (SC-FDMA) modulation of the first transmit mode. In response to a requested bandwidth for a second packet being greater than the bandwidth of the first transmit mode, the transmitter is configured to encode and transmit the second packet from the first antennas. The second packet has a multiple-in-multiple-out orthogonal- frequency-division-multiplexing (M IMO-OFDM) modulation of a second transmit mode. A base station (102) includes a second plurality of antennas (1 12-1 16) and is configured to receive and decode the first packet and the second packet.