Bluetooth MAC Segmentation for Power Management
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Solution Overview
Problem
Bluetooth devices face challenges in meeting stringent power consumption requirements for long-duration background operations due to inefficiencies in existing architectures, such as discrete and integrated designs, which either incur high manufacturing costs or fail to optimize power usage during high-duty-cycle activities.
Innovation Solution
A Bluetooth Upper Medium Access Controller (U-MAC) and Lower Medium Access Controller (L-MAC) architecture is partitioned between a System on Chip (SoC) and a companion chip, allowing the SoC to remain in a deep sleep state while the companion chip handles background activities, thereby reducing power consumption and improving cost efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a discrete Bluetooth architecture is used, then manufacturing cost increases, but power consumption is reduced
Solution Approach 1:
The Bluetooth MAC functionality is segmented into two independent parts: U-MAC integrated in the SoC and L-MAC in a separate companion chip. This segmentation allows the power-intensive L-MAC to be isolated from the SoC, enabling the SoC to enter deep sleep mode during background Bluetooth operations while only the low-power L-MAC remains active, thus resolving the contradiction between power consumption and manufacturing cost.
Solution Approach 2:
The L-MAC functionality is extracted from the SoC and placed in a dedicated companion chip. This extraction enables independent power management where the companion chip can handle background Bluetooth activities (scanning, advertising) without requiring the main SoC to remain awake, achieving low power consumption while keeping the SoC integration benefits.
2Ease of manufacture
If an integrated Bluetooth architecture is used, then manufacturing cost decreases, but power consumption increases
Solution Approach 1:
While maintaining integration benefits, the MAC layer is segmented into U-MAC (in SoC) and L-MAC (in companion chip). This allows the system to leverage integration for cost efficiency while using segmentation for power management, resolving the contradiction between manufacturing cost and power consumption.
3Ease of operation
If the SoC remains active for background Bluetooth operations, then operational responsiveness is improved, but power consumption increases
Solution Approach 1:
Background Bluetooth operations are extracted from the SoC and handled by the independent L-MAC in the companion chip. This extraction allows the SoC to enter deep sleep mode while background operations continue, achieving low power consumption while maintaining operational responsiveness through the autonomous L-MAC.
Solution Approach 2:
The L-MAC in the companion chip is designed to autonomously handle background Bluetooth operations without requiring SoC intervention. This self-service capability allows the SoC to remain in low-power state while the companion chip independently performs scanning, advertising, and other background tasks, resolving the contradiction between responsiveness and power consumption.
Data Source
AI summary
For example, a Bluetooth (BT) apparatus may include a System on Chip (SoC), the SoC including an interface to a BT Lower Medium Access Control (MAC) (L-MAC) external to the SoC; and a BT Upper MAC (U-MAC) to generate setup information to configure one or more BT activities by the BT L-MAC, and to send the setup information to the BT L-MAC via the interface, the setup information to configure one or more wakeup criteria for the BT L-MAC to wake up the BT U-MAC, the one or more BT activities including at least a BT scan, wherein the BT U-MAC is configured to enter a power save mode and to wake up from the power save mode based on receipt of a wakeup indication from the BT L-MAC via the interface to the BT L-MAC.