Dynamic OCC Length Switching for 5G Channel Estimation
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Solution Overview
Problem
In 5G mobile communication systems, the efficient transmission of reference signals is hindered by the need for extensive channel status information, leading to increased uplink overhead and reduced data transmission resources, which affects system throughput and channel estimation performance.
Innovation Solution
A method and apparatus that dynamically switch between orthogonal cover code (OCC) lengths of 2 and 4 to optimize channel estimation, allowing for improved MU-MIMO performance by adjusting OCC length based on conditions such as frequency offsets and data rates, and efficiently transmitting DMRS information using 4 or 3 bits to minimize decoding errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive channel status information is transmitted for reference signal transmission, then channel estimation performance is improved, but uplink overhead increases and data transmission resources are reduced
Solution Approach 1:
The patent extracts only the essential channel status information needed for reference signal transmission rather than transmitting extensive channel status information. By selecting and transmitting only the minimum necessary information, the system maintains adequate channel estimation performance while significantly reducing uplink overhead and preserving data transmission resources.
2Productivity
If OCC length is increased to support more orthogonal transport layers for MU-MIMO, then system throughput is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic switching between different OCC lengths (2 and 4) based on transmission conditions such as frequency offsets and data rates. This dynamic approach allows the system to increase OCC length to support more orthogonal transport layers and improve system throughput when conditions permit, while reducing OCC length to decrease device complexity when conditions require it, thus achieving adaptive optimization.
3Measurement precision
If OCC length is dynamically switched between 2 and 4 to optimize channel estimation, then channel estimation performance is improved, but control information transmission complexity increases
Solution Approach 1:
The patent changes the OCC length parameter dynamically between values of 2 and 4 based on transmission conditions including frequency offsets and data rates. This parameter change enables optimization of channel estimation performance under different conditions while the control information efficiently indicates the selected OCC length, managing the complexity through structured parameter indication.
Data Source
AI summary
Methods and systems for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) are described. Aspects may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method according to an embodiment includes: receiving control information; obtaining information related to the orthogonal cover code (OCC) length, based on the received control information; and receiving a reference signal, based on the information related to the OCC length. A system according to an embodiment includes, a base station that transmits information related to a reference signal to a terminal, and a terminal that receives the reference signal based on the received information, thereby improving the performance of channel estimation.