5.2.MBIM for Windows
The following items will be introduced in the following section:
1.About MBIM
2.Windows MBIM
1.About MBIM
MBIM的標準制定
1.由USB Implement ForumF 於 2011年制定, 成員包括 Microsoft, Intel, Quacomm等大廠
2.標準化:
統一 Programming interface
以單一USB interface統一關於傳輸上的deandIP frames using single, logical USB interface
統一行動寬頻(mobile broadband)設備和PC的介面標準
2.MBIM的簡介 (根據Revision 1.0 )
1.MBIM是一個讓USB hosts跟MB devices可以交換command及data frame的protocol
USB host:
2.Mobile Broadband Interface Model (MBIM)是基於 Network Control
Model (NCM 1.0)的Subclass.
NCM 1.0:
MBIM 1.0的SPEC所定義的USB device會具有傳輸IP封包的能力 (defined by 3GPP/ 3GPP2)
MBIM 1.0的SPEC將定義NCM的IP packet aggregations的單一USB傳輸中的control command, raw IP usage 及 Communications Device Class subclass specification
3.MBIM與NCM 1.0的相容性
MBIM與NCM 1.0最大的差異在於MBIM使用raw IP frames, 有別於以往的802.3 headers

4.MBIM的功能特性
1.MBIM的功能由2個logical channel所組成:
1.為了傳輸payload所提供的data channel: 唯一與USBNCM10不同之處是以Raw IPS及DSS取代Ethernet frames.
2.為了control plane所提供的channel: 例如transporting MBIM control messages
2.通訊管道(COMMUNICATION PIPES)
1.DEFAULT PIPE
常被用於控制USB device, 內容包括standard
requests (例如GET_DESCRIPTOR及SET_CONFIGURATION), Command所回覆的訊息會再藉由Default-pipe傳送給host
2.INTERRUPT PIPE
常被用於提醒host非同步的event,
Interrupt pipe messages are used to alert the host of an asynchronous event from the device. The event
could either be an unsolicited event (see section 9.4.4), or a response to a previously issued class specific control messages (see section 9.4.3)
3.BULK-IN AND BULK-OUT PIPES
5.MBIM的資料傳輸
1.USBNCM10定義在host與device中傳輸IEEE 802.3 frames的方法
2.MBIM使用了與USBNCM10相同的方法, 但在NDP (NCM Datagram Pointers)中的payload不同 , IEEE 802.3 frames將不被支援, 取而代之的是使用raw IP (IPv4及IPv6都有)及Device Service Streams來作為host及device間的傳輸.
3.MBIM在NDP引入了multiple data streams的概念, 以支援IPS及DSS
2.Windows MBIM
MB Scope in Windows 7/8/10
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