MIMO Fronthaul Control Data Mapping Optimization
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Solution Overview
Problem
Current LTE wireless communication networks face challenges in optimizing fronthaul resources due to the duplication of control information across multiple MIMO layers, leading to inefficient use of bandwidth and increased latency, particularly in MIMO implementations where identical Ethernet packets are sent on each layer.
Innovation Solution
The system optimizes fronthaul resource usage by selectively mapping control data onto a limited number of MIMO layers, allowing user data to be transmitted on remaining layers without control information, and employing a control information reconstruction mechanism at the Remote Unit to ensure all data, including control information, is accurately received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is duplicated on each MIMO layer, then reliability of control information transmission is improved, but fronthaul resource utilization deteriorates due to redundant data transmission
Solution Approach 1:
The patent extracts control information from all MIMO layers and consolidates it onto a single reference layer. Instead of duplicating control information across all layers, the system separates control data (transported only on the reference layer) from user data (transported on all layers), thereby eliminating redundant control information transmission while maintaining transmission reliability
Solution Approach 2:
The reference MIMO layer serves multiple functions: it carries both user data and control information, while other non-reference layers carry only user data. This multi-functional design allows the system to maintain control information transmission reliability through the reference layer while optimizing fronthaul resource utilization by having other layers dedicated solely to user data transmission
2Reliability
If control information is transmitted on all MIMO layers, then control information reception reliability is improved, but network latency increases due to processing overhead
Solution Approach 1:
The patent extracts control information from the data stream and transports it separately on only the reference MIMO layer, rather than duplicating it across all layers. This extraction and selective transport reduces the processing overhead at the remote unit, as it needs to process control information from only one layer instead of multiple layers, thereby reducing network latency while maintaining reception reliability
Solution Approach 2:
The system performs preliminary identification and separation of control information from user data at the server unit before transmission. By pre-processing the data to identify which packets contain control information and routing them appropriately to the reference layer, the system avoids the need for complex post-reception processing at the remote unit, thus reducing latency
3Reliability
If identical Ethernet packets are sent on each MIMO layer, then data transmission redundancy is improved for reliability, but bandwidth efficiency deteriorates
Solution Approach 1:
The patent segments the data transmission into two distinct types: control information packets (transported only on the reference layer) and user data packets (transported on all layers). This segmentation allows the system to apply different transmission strategies to different types of data, ensuring control information reliability while optimizing bandwidth efficiency by eliminating redundant user data transmission on the reference layer
Solution Approach 2:
The system extracts control information from the overall data stream and handles it separately from user data. By identifying and extracting control packets, the system can transmit them only on the reference layer without duplicating them across all layers, thereby improving bandwidth efficiency while maintaining the reliability needed for control information transmission
Data Source
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AI summary
There is provided a server unit (7) in a communication network implementing a MIMO wireless communication, the server unit (7) being configured to receive data from a backhaul transport network and perform baseband processing, the server unit (7) being configured to transmit a data signal derived from the processed data to a remote unit (6) over a number of MIMO layers, through a fronthaul link. The data signal transmitted to the remote unit (6) comprising physical user data and physical control data. The server unit (7) comprises a control data mapper (206) configured to select at least one MIMO layer, the control data mapper (206) being further configured to map at least a part of the control data to the at least one selected MIMO layers. The server unit (7) is configured to send a copy of the physical user data on each MIMO layer, and the control data on the selected MIMO layers mapped thereto.