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HUAWEI ME909u-521 LTE LGA Module
Application Guide
Sleeping and Waking Up Application Scenarios
Issue 01 (2013-07-05)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
51
8 Sleeping and Waking Up Application
Scenarios
As an embedded component in the host, the module also consumes power, which
increases the power consumption of the integrated product. Therefore, the most
important task of power management is to reduce the power consumption of the
integrated product by enabling the module's sleep mode when necessary.
The host and the module need to wake each other up from sleep if communication is
required. Therefore, another task of power management is to provide a wake-up
control mechanism for the host and module.
Power management involves three parts: the host system software (including the
USB driver/UART driver/GPIO driver/sleep mechanism functions), connection
hardware between the host and module, and the module's software wake-up
mechanism.
This chapter is mainly concerned with the module's software wakeup mechanism,
including the wake-up principle, how USB related events impact on the waking up of
the module and remotely waking up the module, and how the module remotely wakes
up the host.
This chapter briefly describes the power management related connection hardware
between the host and module.
This chapter does not describe the host system software. For example, if the host
runs on a Windows or Mac system, Huawei will provide a USB driver program
corresponding to the module. If the host runs on an Android system, Huawei will
provide HUAWEI Module Android RIL Integration Guide for users to configure the
USB-based wakeup function of the module. If the host runs on a Linux system, power
management is supported only when the Linux Kernel version is 2.6.35 or later.
This document describes typical module application scenarios. A host can be
designed based on the actual system features and the application scenarios of the
module to reduce power consumption of both the module and integrated product.
After the host is designed as recommended by this document, the module's power
consumption and the whole unit's power consumption can meet the performance
requirements. For details, see related description in the product manual.