Cellular Modem Pipeline Synchronization via Hybrid Flow Control
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Solution Overview
Problem
Current cellular modem processors face challenges in efficiently managing data synchronization between pipeline stages for high-speed cellular data communication, particularly in supporting multiple standards like 4G and 5G, while maintaining area and power efficiency.
Innovation Solution
The implementation of dedicated processing engines with firmware-based flow control and hardware-based data dependency management, utilizing a hybrid approach that includes a control processor, interlock controller, and buffer memory with a virtual address space to ensure data synchronization and prevent data dependencies from interfering with pipeline operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cellular data communication standards (4G and 5G) are supported in a single modem, then adaptability is improved, but device complexity increases
Solution Approach 1:
The modem processor is divided into multiple dedicated processing engines, each optimized for specific cellular standards (4G, 5G). Each engine contains specialized hardware components for standard-specific operations, allowing simultaneous support for multiple standards without requiring a single complex general-purpose processor.
Solution Approach 2:
The pipeline architecture provides a universal framework that can execute different processing algorithms for multiple cellular standards. The same pipeline infrastructure handles both 4G and 5G processing tasks, reducing overall system complexity while maintaining multi-standard support.
2Productivity
If high-speed data communication is implemented, then productivity is improved, but use of energy increases
Solution Approach 1:
Software-based flow control mechanisms are replaced with hardware-based interlock controllers that use dedicated control signals and status flags. This hardware substitution enables faster data processing at high speeds while consuming less power than software polling or interrupt-based approaches.
Solution Approach 2:
The processing engines and interlock controllers automatically manage data flow synchronization without requiring external software intervention. The hardware interlocks self-regulate pipeline operations based on data readiness signals, reducing the need for power-consuming software management at high data rates.
3Productivity
If dedicated processing engines are used for high-speed data processing, then productivity is improved, but area of the device increases
Solution Approach 1:
Multiple processing functions for different cellular standards are merged into shared pipeline stages. The pipeline architecture allows common processing operations (such as FFT, channel decoding, and signal filtering) to be shared across 4G and 5G processing paths, reducing the total hardware area required compared to completely separate processing chains.
Solution Approach 2:
The patent uses a time-multiplexed pipeline architecture where processing engines can be dynamically allocated to different standards based on current operational requirements. This temporal dimension allows the same physical hardware to serve multiple functions, reducing spatial area requirements while maintaining high processing speeds.
Data Source
AI summary
A cellular modem processor can include dedicated processing engines that implement specific, complex data processing operations. The processing engines can be arranged in pipelines, with different processing engines executing different steps in a sequence of operations. Flow control or data synchronization between pipeline stages can be provided using a hybrid of firmware-based flow control and hardware-based data dependency management. Firmware instructions can define data flow by reference to a virtual address space associated with pipeline buffers. A hardware interlock controller within the pipeline can track and enforce the data dependencies for the pipeline.