ELITEGROUP COMPUTER SYSTEMS ED2LN30PA1 DATA CARD User Manual Part 2

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 

The following section describes the system architecture of Inter-Processor Communication on

a WWAN M.2 module when connected to a Microsoft Windows® based Host OS Windows®

7, Windows® 8.x.

The software components of a WWAN M.2 module running Windows® 7 and

Windows® 8 are depicted in Figure 12 and Figure 13 respectively.

Microsoft requirements:

Update, Carrier Switching application.

For all Windows platforms:

The WWAN M.2 module is exposed as a composite device

GNSS will be supported through a serial interface

When mobile broadband is disabled, GNSS will still be available.

The mobile network adapter driver will interface to the modem software through the

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Figure 12 Windows 7 Software Architecture

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Figure 13 Windows 8 Software Architecture

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 

 

with a single modem architecture, IMC will provide a kernel level driver implementing the

 

Windows PC/Tablet to communicate to the GNSS device located on the M.2 module. The

This same application is used to upgrade the standard image flashed at the factory with one

inserted SIM does not match the WWAN device firmware. It will then allow the user to

select and update the WWAN firmware with a suitable image reflecting the local network of

under guidance of a Customer Support operator. The log file can be sent to a Technical

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only the AT control plane and IP packets data connection. Audio packet exchange is outside

the scope of the current version of M.2.

 

Figure 14 illustrates the architecture of the IPC and its components.

Figure 14 Linux Software Architecture

The user data is transferred from/to the cellular protocol stack (C-PS) to the IPC via a

centralized memory manager. The centralized memory manager is called packet buffer

manager (PBM). The user data is routed along the data plane as IP packets using several

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logical channels. Each logical channel corresponds to a dedicated Packet Data Network

(PDN) connection.

The control plane is using at least one dedicated channel through Serial IO component (S-IO)

to the AT command handler. The interface towards the driver is called Universal Terminal

interface. The application in our case is the AT command handler called C-AT. The control

channel is using AT commands. A detailed list of all supported AT commands can be found

in a separate application note.

 

In the context of an AT command based architecture, a SW multiplexer can be added. The

SW multiplexer of the 3GPP 27.010 protocol provides a number of logical channels (DLC)

one of the control channels of the specific physical IPC interface.

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 

The USB feature may be configured by the UTA_USB API. The user may define different

use cases, such as support of different numbers of CDC-ACM or CDC-NCM channels.

following functionality:

3GPP 27.010 Multiplexer

Connection to test framework

1st ACM channel:: Modem Control Channel, Channel ID: USBCDC/0

2nd ACM channel:: Trace data, Channel ID: USBCDC/1

3rd ACM channel:: free, Channel ID: USBCDC/2

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  

1st - 4th NCM channel: data channel for PDN connection: Channel ID:

 

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  

 

harmonics from the host processor and associated support circuitry. It is required that the

Data Card be no greater than 5 dB as compared to the noise floor of the host system.

 

best antenna and chassis design. This noise hampers the wireless radio performance,

One of the key elements of platform noise, commonly referred to as RF interference, is LCD

display panel pixel clock and its harmonics. The pixel clock generates RF that translates

electronics and the integrated antennas in the system. Many of the panel vendors allow the

pixel clock to be “tweaked” (i.e. adapt the pixel clock) to shift the harmonics from interfering

To support crosstalk mitigation, the WWAN module provides an event indication to the host

information) through an API that would facilitate the facilitating the implementation of a

 

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  

of the WWAN Card. The firmware will support the extraction of temperature information

The configuration of the thermal trip points and receipt of thermal data is available

through a WWAN power control API in order for the host to implement a power and

thermal management framework for the system.

 

 

Table 32 Conducted Transmit Power – 2G

1800 MHz/1900 MHz 30 dBm +/- 3 db

Table 33 Conducted Transmit Power – 3G





  

Table 34 Conducted Transmit Power – LTE

 





  





  





  

 

The following tables provide antenna guidance for the platform designer.

Impedance 50 ohm

Antenna Shape

and Radiation

Polarization Predominantly vertical polarization and near Omni-Azimuth pattern are

Band

UE Tx

Main Antenna

(MHz)

Diversity Antenna

(MHz)





  

RF

Uplink (UL)

Bandwidth of

Bandwidth of





  

 





  

 

The mechanical dimensions of WWAN Card Type 3042 are shown in Figure 17 and Figure 17.

slot+. All components are mounted on the Top side.





  