Uplink MIMO Transmission Modes for Mobile Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrating multiple receive antennas in small, space-constrained mobile devices has been challenging due to size constraints and undesirable antenna interactions, limiting the use of MIMO techniques in uplink transmissions from mobile devices to base stations.
Innovation Solution
A method for mobile devices with multiple antennas to selectively transmit in open-loop single-user MIMO, closed-loop single-user MIMO, or multi-user collaborative MIMO modes, depending on speed and request, to optimize data transmission rates and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are integrated in mobile devices, then data transmission rates and system throughput are improved, but device size constraints and antenna interaction problems worsen
Solution Approach 1:
The patent segments the MIMO transmission protocol into multiple modes (open-loop single-user, closed-loop single-user, and multi-user collaborative) that can be selectively activated. This segmentation allows the system to optimize for different scenarios: using simpler modes when space is constrained and complex modes when performance is prioritized, thus resolving the contradiction between transmission rate and device size
Solution Approach 2:
The patent implements dynamic mode selection where the mobile device can switch between different MIMO transmission modes based on real-time conditions such as device speed, channel state, and network requirements. This dynamic adaptability allows the system to achieve high data transmission rates when conditions permit while falling back to simpler modes when space or environmental constraints exist
2Productivity
If multiple antennas are integrated in mobile devices, then system throughput is improved, but antenna interaction problems worsen
Solution Approach 1:
The patent changes the operational parameters of the antenna system by implementing different MIMO modes that alter how antennas transmit and receive signals. Open-loop modes use fixed transmission patterns that minimize interaction, while closed-loop modes use feedback to adjust parameters and mitigate harmful antenna interactions, thus maintaining high throughput while managing antenna interference
3Ease of operation
If MIMO modes are employed in uplink transmissions, then user experience is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by implementing MIMO modes selectively rather than always. The system uses full MIMO capability (excessive action) when it benefits user experience, but reduces to simpler transmission modes (partial action) when the complexity outweighs benefits, such as when the device is moving at high speed or space is severely constrained
4Reliability
If multiple antennas are used in mobile devices, then reliability is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent makes the antenna system universal by designing it to perform multiple functions through different MIMO modes. The same physical antennas can operate in space-time block coding mode for reliability, open-loop spatial multiplexing for speed, or closed-loop modes for optimized performance, allowing a single antenna design to serve multiple purposes and reduce manufacturing complexity
Data Source
AI summary
Uplink transmission from a mobile device having multiple antennas to a base station having multiple antennas includes transmitting in an open-loop single-user MIMO mode when the mobile device is at high speed, transmitting in a closed-loop single-user MIMO mode when the mobile device is at low speed, and, upon request, transmitting in a multi-user collaborative MIMO mode. The method also includes controlling uplink transmissions in a selected one of the open-loop single-user MIMO, the closed-loop single-user MIMO and the multiuser collaborative MIMO modes. Uplink transmissions from the mobile device may be transmitted using multiple antennas of the mobile device. Upon request, the mobile device may switch to transmitting in multi-user collaborative MIMO mode with a subset of the multiple antennas.