Flexible UE Cooperative MIMO Framework for Phase Alignment
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Solution Overview
Problem
UE cooperation (UC) MIMO systems face challenges in achieving precise phase alignment and synchronization among user equipment (UEs), which is required for effective coherent joint transmission (CJT) MIMO.
Innovation Solution
A flexible transmitter and receiver framework that allows configuration between closed-loop MIMO and open-loop MIMO, enabling switching between different configurations based on network conditions to achieve optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If closed-loop MIMO configuration is used for UE cooperative transmission, then transmission efficiency is improved through precise phase alignment, but system complexity and synchronization requirements increase significantly
Solution Approach 1:
The patent implements dynamic switching between closed-loop and open-loop MIMO configurations based on network conditions, UE capabilities, and channel states. The network device can flexibly configure participating UEs to use different MIMO modes, allowing the system to adapt to varying synchronization capabilities and channel conditions, thereby resolving the contradiction between transmission efficiency and synchronization complexity
Solution Approach 2:
The patent changes the operational parameters of the MIMO system by allowing UEs to switch between closed-loop and open-loop configurations. This parameter change enables the system to adjust the level of phase alignment precision required, thereby balancing transmission efficiency gains against the complexity of maintaining precise synchronization across multiple UEs
2Device complexity
If open-loop MIMO configuration is used for UE cooperative transmission, then system complexity is reduced, but transmission efficiency decreases compared to closed-loop MIMO
Solution Approach 1:
The system dynamically selects between open-loop and closed-loop MIMO configurations based on real-time network conditions, channel quality, and UE capabilities. When channel conditions are favorable and synchronization can be maintained, the system switches to closed-loop for higher efficiency. When synchronization becomes difficult to maintain, it transitions to open-loop, preventing performance degradation while keeping complexity manageable
Solution Approach 2:
The patent creates a universal MIMO framework that can operate in both closed-loop and open-loop modes within the same UE cooperation system. This multi-functionality allows the system to serve different scenarios and requirements, providing high efficiency when possible while maintaining operational simplicity when needed, thus resolving the efficiency-complexity trade-off
3Adaptability or versatility
If frequent switching between closed-loop and open-loop MIMO configurations is enabled, then adaptability to network conditions is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements periodic reconfiguration of MIMO modes based on channel condition changes, mobility states, and network load. Instead of continuous switching, the system uses periodic measurements and evaluations to determine when configuration changes are necessary, reducing unnecessary signaling while maintaining adaptability to significant changes in network conditions
Solution Approach 2:
The system uses feedback mechanisms where UEs report channel quality, synchronization status, and capability information to the network device. Based on this feedback, the network device intelligently determines when switching between closed-loop and open-loop configurations is beneficial, thereby reducing unnecessary reconfiguration signaling while maintaining optimal performance
Data Source
AI summary
A transmitter and receiver framework that is flexibly configurable between various cooperative MIMO configurations is provided, for example, between closed-loop MIMO and open-loop MIMO. A method of signaling is provided for use in configuring a shared medium access control (MAC) layer in a first apparatus, such as a user equipment, for use in cooperative transmission by a plurality of apparatus inclusive of the first apparatus.