Centralized Channel Coding and Shaping for Multi-Node RAN
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Solution Overview
Problem
In cellular networks using multiple remote radio nodes (RRNs), user devices receive distorted RF signals due to channel characteristics, leading to signal dispersion, delay, and loss, which affects signal quality and throughput.
Innovation Solution
A baseband controller adjusts RF signals on a per-RRN and per-user device basis by generating channel parameters from feedback reports, pre-distorting signals to compensate for channel dispersion, and modifying traffic buffer parameters and encoding to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple remote radio nodes transmit orthogonal versions of the same signal to user devices, then signal quality and network capacity are improved, but signal dispersion and distortion occur due to channel characteristics
Solution Approach 1:
The baseband controller applies pre-distortion to signals before transmission through RRNs. By anticipating channel characteristics and applying inverse distortion, the system counteracts signal dispersion and distortion that would otherwise occur during transmission, ensuring undistorted reception at user devices
Solution Approach 2:
The system implements feedback mechanisms where channel characteristics are measured and reported back to the baseband controller. This feedback enables dynamic adjustment of pre-distortion parameters and traffic buffer settings to compensate for varying channel conditions, maintaining signal quality despite changing environmental factors
2Productivity
If per-RRN and per-user device signal adjustment is implemented, then signal quality and throughput are improved, but system complexity increases
Solution Approach 1:
The patent consolidates multiple adjustment functions (signal pre-distortion, traffic buffer management, encoding optimization) into a single centralized baseband controller. This merging approach enables per-RRN and per-user device optimization without proportionally increasing overall system complexity, as all control logic resides in one location rather than being distributed across multiple nodes
Solution Approach 2:
The system dynamically adjusts transmission parameters including pre-distortion coefficients, traffic buffer sizes, and encoding rates based on channel conditions and user device requirements. By optimizing these parameters centrally, the system achieves high throughput for each user-RRN pair without requiring complex distributed decision-making algorithms
3Reliability
If centralized baseband controller manages multiple RRNs with per-user device optimization, then signal robustness and quality are improved, but control and coordination complexity increases
Solution Approach 1:
The baseband controller is designed as a universal platform that handles multiple functions including signal generation, pre-distortion application, traffic buffering, encoding, and coordination of multiple RRNs. This multi-functional design consolidates control complexity into a single versatile device rather than requiring specialized controllers for each function
Solution Approach 2:
The baseband controller performs all necessary signal processing and optimization actions before signals are transmitted to RRNs. By pre-calculating pre-distortion parameters, pre-configuring traffic buffers, and pre-optimizing encoding schemes, the system eliminates the need for complex real-time coordination during transmission, simplifying overall control
Data Source
AI summary
A system may be configured to determine radio frequency (“RF”) transmission error types associated with a group of channels. Each channel may be associated with a particular remote radio node (“RRN”), of a group of RRNs, and a user device. The system may further modify subsequent RF communications between the RRNs and the user device, on a per-channel basis, and based on the determined transmission error types associated with each channel.