Logical Lane Mapping for Coordinated Multipoint MIMO
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Solution Overview
Problem
In existing coordinated multipoint operation modes, the MIMO mode of a network is restricted by network elements with a small quantity of physical lanes, leading to a severe drop in performance and coverage for elements with a large quantity of physical lanes.
Innovation Solution
A data transmission method and device that divide preconfigured logical lanes into logical lane groups and map them to different physical lanes, allowing for the support of more logical lanes than physical lanes, thereby overcoming the restriction imposed by network elements with a small quantity of physical lanes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network elements with different quantities of physical lanes perform coordinated transmission using conventional mapping schemes, then the system maintains compatibility with single-point operation modes, but the MIMO mode of the entire network is restricted by network elements with a small quantity of physical lanes
Solution Approach 1:
The patent segments the mapping process into two independent stages: first mapping physical lanes to antenna ports using physical lane mapping parameters, then mapping antenna ports to CSI-RS resources using antenna port mapping parameters. This segmentation allows each stage to be configured independently, enabling network elements with different physical lane quantities to participate in coordinated transmission without being restricted by the minimum physical lane count, thus resolving the contradiction between MIMO mode support and mapping complexity.
2Productivity
If an 8-lane RRU performs coordinated transmission with a 1-lane RRU using conventional mapping, then the system maintains operational compatibility, but only 1 logical lane can be supported and higher-order MIMO modes cannot be supported
Solution Approach 1:
The patent introduces a new dimension of mapping by adding antenna port mapping parameters as an intermediate layer between physical lanes and CSI-RS resources. This dimensional expansion allows the system to decouple the relationship between physical lane quantity and supported MIMO modes. Network elements with different physical lane quantities (e.g., 8-lane and 1-lane RRUs) can now coordinate transmission with flexible MIMO mode support, as the antenna port mapping parameters enable the 8-lane RRU to utilize its full capability while the 1-lane RRU operates within its constraints, thus resolving the contradiction between data transmission rate and MIMO mode flexibility.
3Reliability
If logical lanes are strictly limited to not exceed physical lanes in single-point operation mode, then coherence requirements are satisfied, but network elements with large quantities of physical lanes experience severe performance and coverage drop when coordinated with elements having fewer physical lanes
Solution Approach 1:
The patent introduces antenna ports as an intermediary layer between physical lanes and logical lanes (CSI-RS resources). This intermediary allows physical lane mapping parameters to establish the relationship between physical lanes and antenna ports, while antenna port mapping parameters establish the relationship between antenna ports and logical lanes. This intermediary structure enables network elements with different physical lane quantities to satisfy coherence requirements through proper mapping configuration while allowing network elements with large quantities of physical lanes to maintain high performance and coverage by utilizing their full capability, thus resolving the contradiction between coherence requirement satisfaction and productivity.
Data Source
Figure 1~3
AI summary
The present invention discloses a data transmission method and device, which are used to resolve a problem that in an existing coordinated multipoint operation mode, an MIMO mode of an entire network is restricted by a network element that has a small quantity of physical lanes. The method in embodiments of the present invention includes: dividing, by a network device, N preconfigured logical lanes into M logical lane groups according to a preset mapping relationship between a logical lane and a physical lane, and mapping each of the logical lane groups to a different physical lane of the network device, where both M and N are positive integers, M is less than N, and M is a quantity of physical lanes of the network device; and transmitting, by the network device to a receiving device by using each of the physical lanes, a signal configured on each logical lane in a logical lane group corresponding to each of the physical lanes. In this way, the network device can support logical lanes whose quantity is greater than the quantity of physical lanes of the network device.