Multi-cell MIMO Precoding for Cell Boundary Reliability
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Solution Overview
Problem
Current MIMO systems face challenges in providing high reliability and diversity gain for data transmission in multi-cell environments, particularly at cell boundaries, while maintaining compatibility with single-cell MIMO systems.
Innovation Solution
The method involves receiving and transmitting data streams from multiple antennas, with one stream precoded to have different time delays, antenna permutations, or stream permutations compared to another stream based on the same source data, allowing for improved data restoration and reliability across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collaborative MIMO is used to transmit data to terminals at cell boundaries, then communication reliability and diversity gain are improved, but system complexity and interference management difficulty increase
Solution Approach 1:
The patent segments the collaborative MIMO transmission into distinct phases: phase information acquisition from multiple base stations, phase alignment processing, and coordinated data transmission. This segmentation allows complex multi-cell coordination to be managed through structured, modular operations, reducing overall system complexity while maintaining reliability benefits
Solution Approach 2:
The patent implements preliminary phase alignment and calibration between collaborative base stations before actual data transmission. By pre-synchronizing phase information and establishing coordination protocols in advance, the system reduces real-time processing complexity during active transmission while ensuring reliable coordinated operation
2Measurement precision
If phase alignment is performed between collaborative base stations, then constructive interference and signal quality are improved, but synchronization complexity and processing overhead increase
Solution Approach 1:
The patent implements feedback mechanisms where base stations exchange phase information and channel state data with collaborating base stations. This feedback loop enables automatic phase alignment and adaptive adjustment of transmission parameters, improving signal quality through constructive interference while reducing manual synchronization complexity
Solution Approach 2:
The patent dynamically adjusts transmission phase parameters and timing offsets based on channel conditions and collaboration status. By changing these parameters adaptively rather than maintaining fixed configurations, the system achieves high signal quality through phase alignment while managing processing overhead through efficient parameter optimization
3Productivity
If multiple data streams are transmitted from multiple base stations, then data transfer rate and spectral efficiency are improved, but inter-cell interference and signal processing complexity increase
Solution Approach 1:
The patent employs asymmetric transmission strategies where collaborative base stations transmit different data streams or different portions of the same data with distinct phase relationships. This asymmetry in transmission content and phase configuration allows multiple streams to coexist with reduced interference compared to symmetric transmissions, while maintaining high aggregate data rates
Solution Approach 2:
The patent converts potential inter-cell interference into beneficial effects by using coordinated phase alignment and beamforming techniques. What would normally be harmful interference from neighboring base stations is transformed into constructive signal reinforcement through deliberate phase coordination, improving signal quality while enabling higher data rates from multiple transmit points
Data Source
AI summary
The present invention relates a method for transmitting and receiving data in a mobile communication system. More specifically, the invention relates to a method through which a terminal in a cell boundary receives data in a mobile communication system that supports MIMO (Multi Input Multi Output). The method comprises: a step for receiving a first data stream transmitted through multiple transmission antennas from a serving base station, a step for pre-coding a second data stream to make the time delay of the second data stream be different from that of the first data stream and receiving the second data stream from a collaborating base station, and a step for restoring the data based on the first and second data streams.