- •TABLE OF CONTENTS
- •1.1 Motivation
- •1.2 Design Goals
- •1.3 Objective of the Specification
- •1.4 Scope of the Document
- •1.5 USB Product Compliance
- •1.6 Document Organization
- •2.1 Terms
- •2.2 Conventions:
- •2.3 References
- •3.1 USB System Description
- •3.1.1 Topology
- •3.1.1.1 USB Host
- •3.1.1.2 Wireless USB Devices
- •3.2 Physical Interface
- •3.3 Power Management
- •3.4 Bus Protocol
- •3.5 Robustness
- •3.5.1 Error Handling
- •3.6 Security
- •3.7 System Configuration
- •3.7.1 Attachment of Wireless USB Devices
- •3.7.2 Removal of Wireless USB Devices
- •3.7.3 Bus Enumeration
- •3.8 Data Flow Types
- •3.9 Wireless USB Devices
- •3.9.1 Device Characterizations
- •3.9.2 Devices and MAC Layer
- •3.10 Wireless USB Host: Hardware and Software
- •4.1 Implementer Viewpoints
- •4.2 Communications Topology
- •4.2.1 Physical Topology
- •4.3 Wireless USB Communication Flows
- •4.3.1 Wireless USB Channel Time
- •4.3.2 MMC Transmission Accuracy
- •4.3.3 USB Time across Device Wire Adapters
- •4.3.5 Device Endpoints
- •4.3.6 Wireless USB Information Exchange Methods
- •4.3.7 Device Perspective
- •4.3.7.1 Self Beaconing Devices
- •4.3.7.2 Directed Beaconing Devices
- •4.3.7.3 Non Beaconing Devices
- •4.3.7.4 Selecting A Wireless USB Host
- •4.3.8 Host Perspective
- •4.3.8.1 MAC Layer Compliant Device
- •4.3.8.2 Wireless USB Host
- •4.3.8.3 Host System Management
- •4.3.8.5 Other Host Considerations
- •4.4 Data Transfers
- •4.4.1 Burst Mode Data Phase
- •4.5 Bulk Transfers
- •4.5.1 Bulk Transfer Packet Size and Signaling Rate Constraints
- •4.5.2 Bulk Transfer Channel Access Constraints
- •4.5.3 Bulk Transfer Data Sequences
- •4.6 Interrupt Transfers
- •4.6.1 Low Power Interrupt IN
- •4.6.2 Interrupt Transfer Packet Size and Signaling Rate Constraints
- •4.6.3 Interrupt Transfer Channel Access Constraints
- •4.6.4 Interrupt Transfer Data Sequences
- •4.7 Isochronous Transfers
- •4.7.1 Isochronous Transfer Packet Size and Signaling Rate Constraints
- •4.7.2 Isochronous Transfer Channel Access Constraints
- •4.7.3 Isochronous Transfer Data Sequences
- •4.7.4 Isochronous Endpoint Host System Admission Decisions
- •4.7.5 Isochronous Data Discards and Use of Isochronous Packet Discard IE
- •4.8 Control Transfers
- •4.8.1 Control Transfer Packet Size and Signaling Rate Constraints
- •4.8.2 Control Transfer Channel Access Constraints
- •4.8.3 Control Transfer Data Sequences
- •4.8.4 Data Loopback Commands
- •4.9 Device Notifications
- •4.10 Media Reliability Considerations
- •4.10.1 Transmit Power Control
- •4.10.2 Adjustments to Data Phase Packet Payload Sizes
- •4.10.3 Adjustments to Transmit Bit Rate
- •4.10.4 Changing PHY Channel
- •4.10.5 Host Schedule Control
- •4.10.6 Dynamic Bandwidth Interface Control
- •4.11 Special Considerations for Isochronous Transfers
- •4.11.1 Summary Of Key Features Of USB Wired Isochrony
- •4.11.1.1 Wireless Service Intervals
- •4.11.2 UWB Media Characteristics
- •4.11.2.1 Superframe Layout
- •4.11.2.2 Worst Case Superframe Layout – Service Interval Bounds.
- •4.11.2.3 Wireless Packet Error Rates
- •4.11.3 Wireless USB Isochronous Transfer Level Protocol
- •4.11.4 Wireless USB Isochronous IN Example
- •4.11.5 Wireless USB Isochronous OUT Example
- •4.11.6 Choosing an Isochronous IN or Isochronous OUT Endpoint Buffer Size
- •4.11.7 Isochronous OUT endpoint receiver implementation options
- •4.11.7.1 Presentation Time aware implementation
- •4.11.7.2 Presentation time aware implementation with “false” acknowledgement
- •4.11.7.3 Presentation time unaware implementations
- •4.11.8 Synchronization
- •4.11.8.1 Synchronizing a Stream Start Time
- •4.11.9 Error Handling Details
- •4.11.9.1 Reporting Data Discarded At the Transmitter
- •4.11.9.2 Discarding Data during A Burst
- •4.11.9.3 Application Handling of Discards
- •4.12 Device Reset
- •4.13 Connection Process
- •4.13.1 Reconnection Process
- •4.14 Disconnect
- •4.15 Security Mechanisms
- •4.15.1 Connection Lifetime
- •4.15.2 Host Security Considerations
- •4.15.2.1 CHID Selection
- •4.15.2.2 CDID Selection
- •4.16 Wireless USB Power Management
- •4.16.1 Device Power Management
- •4.16.1.1 Device Sleep
- •4.16.1.2 Device Wakeup
- •4.16.2 Host Power Management
- •4.16.2.1 Channel Stop
- •4.16.2.2 Remote Wakeup
- •4.16.2.3 Channel Start
- •4.17 Dual Role Devices (DRD)
- •4.17.2 Pairing P2P-DRD to establish reverse link
- •5.1 Packet Formats
- •5.2 Wireless USB Transaction Groups
- •5.2.1 Wireless USB Channel Time Allocation Information Elements
- •5.3 Transaction Group Timing Constraints
- •5.3.1 Streaming-Mode Inter-packet Constraints for the PHY
- •5.3.2 Protocol Synchronization
- •5.4 Data Burst Synchronization and Retry
- •5.5 Wireless USB Transactions
- •5.5.1 Isochronous Transactions
- •5.5.2 Control Transfers
- •5.5.3 Device Notifications
- •5.5.4 Flow Control
- •6.1 Introduction
- •6.1.1 Goal of USB Security
- •6.1.2 Security and USB
- •6.2 Overview
- •6.2.1 Base of Trust
- •6.2.2 Preserve the Nature of the USB Device Model
- •6.2.3 Implementation of Security Extensions
- •6.2.4 Encryption Methods
- •6.2.5 Message Format
- •6.2.6 Encryption Keys
- •6.2.6.1 Master Keys
- •6.2.6.2 Session Keys
- •6.2.7 Correct key determination
- •6.2.8 Replay Prevention
- •6.2.9 Secure Packet Reception
- •6.2.10 General Connection Model
- •6.2.10.1 Connection Context
- •6.2.10.2 Connection Lifetime
- •6.2.10.3 New Connection
- •6.2.10.4 Connection
- •6.2.10.5 Reconnection
- •6.2.10.6 Revocation
- •6.2.10.8 Diagnostic Support
- •6.2.10.9 Mutual Authentication
- •6.2.11 Key Management
- •6.2.11.1 PTK Management
- •6.2.11.2 GTK Management
- •6.3 Association and Authentication
- •6.3.1 Connection and Reconnection Requests
- •6.3.2 Authentication
- •6.3.2.1 Authentication Related Device Capabilities
- •6.3.2.2 Ceremonies
- •6.4.1 CCM nonce Construction
- •6.4.2 l(m) and l(a) Calculation
- •6.4.3 Counter-mode Bx Blocks
- •6.4.4 Encryption Ax Blocks
- •6.5.1 Key Derivation
- •6.5.2 Out-of-band MIC Generation
- •6.5.3 Example Random Number Generation
- •7.1 Wireless USB Device States
- •7.1.1 UnConnected
- •7.1.2 UnAuthenticated
- •7.1.3 Authenticated
- •7.1.4 Reconnecting
- •7.2 Generic Wireless USB Device Operations
- •7.3 Standard Wireless USB Device Requests
- •7.3.1 Wireless USB Extensions to Standard Requests
- •7.3.1.1 Clear Feature
- •7.3.1.2 Get Status
- •7.3.1.3 Set Address
- •7.3.1.4 Set Feature
- •7.3.1.5 Set Interface DS
- •7.3.1.6 Set WUSB Data
- •7.3.1.7 Data Loopback Write
- •7.3.1.8 DATA Loopback Read
- •7.3.2 Security-related Requests
- •7.3.2.1 Get Security Descriptor
- •7.3.2.2 Set Encryption
- •7.3.2.3 Get Encryption
- •7.3.2.4 Key Management
- •7.3.2.6 Set Security Data
- •7.3.2.7 Get Security Data
- •7.4 Standard Wireless USB Descriptors
- •7.4.1 Device Level Descriptors
- •7.4.1.1 Wireless USB Device Capabilities – UWB
- •7.4.2 Configuration
- •7.4.3 Endpoint
- •7.4.4 Wireless USB Endpoint Companion
- •7.4.5 Security-Related Descriptors
- •7.4.5.1 Security Descriptor
- •7.4.5.2 Key Descriptor
- •7.5 Wireless USB Channel Information Elements
- •7.5.1 Wireless USB Connect Acknowledge IE
- •7.5.2 Wireless USB Host Information IE
- •7.5.3 Wireless USB Channel Change Announcement IE
- •7.5.4 Wireless USB Device Disconnect IE
- •7.5.5 Wireless USB Host Disconnect IE
- •7.5.6 Wireless USB Release Channel IE
- •7.5.7 Wireless USB Work IE
- •7.5.8 Wireless USB Channel Stop IE
- •7.5.9 Wireless USB Device Keepalive IE
- •7.5.10 Wireless USB Isochronous Packet Discard IE
- •7.5.11 Wireless USB Reset Device IE
- •7.5.12 Wireless USB Transmit Packet Adjustment IE
- •7.6 Device Notifications
- •7.6.1 Device Connect (DN_Connect)
- •7.6.1.1 Connect Request
- •7.6.1.2 Reconnect Request
- •7.6.2 Device Disconnect (DN_Disconnect)
- •7.6.3 Device Endpoints Ready (DN_EPRdy)
- •7.6.4 Device MAS Availability Changed (DN_MASAvailChanged)
- •7.6.5 Device Sleep (DN_Sleep)
- •7.6.6 Remote Wakeup (DN_RemoteWakeup)
- •7.6.7 Device Alive (DN_Alive)
- •8.1 Operational Model
- •8.1.1 Functional Characteristics
- •8.1.2 Data Transfer Interface
- •8.1.3 Remote Pipe
- •8.1.4 Wire Adapter Functional Blocks
- •8.1.5 Downstream Port(s)
- •8.1.6 Upstream Port
- •8.1.7 Downstream Host Controller
- •8.1.8 Upstream Endpoint Controller
- •8.1.9 Remote Pipe Controller
- •8.1.9.1 RPipe Descriptor
- •8.1.9.2 Bulk OUT Overview
- •8.1.9.3 Bulk IN Overview
- •8.1.9.4 Control Transfer Overview
- •8.1.9.5 Interrupt Transfer Overview
- •8.1.9.6 Isochronous Transfer Overview
- •8.1.10 Suspend and Resume
- •8.1.10.1 DWA Suspend and Resume
- •8.1.10.2 HWA Suspend and Resume
- •8.1.11 Reset Behavior
- •8.1.12 Device Control
- •8.1.13 Buffer Configuration
- •8.2 Descriptors
- •8.3 Requests
- •8.3.1 Wire Adapter Class-Specific Requests
- •8.3.1.1 Abort RPipe
- •8.3.1.2 Clear RPipe Feature
- •8.3.1.3 Clear Wire Adapter Feature
- •8.3.1.4 Get RPipe Descriptor
- •8.3.1.5 Get RPipe Status
- •8.3.1.6 Get Wire Adapter Status
- •8.3.1.7 Set RPipe Descriptor
- •8.3.1.8 Set RPipe Feature
- •8.3.1.9 Set Wire Adapter Feature
- •8.3.1.10 Reset RPipe
- •8.3.2 Notification Information
- •8.3.3 Transfer Requests
- •8.3.3.1 Control Transfers
- •8.3.3.2 Bulk and Interrupt Transfers
- •8.3.3.3 Transfer Completion Notification
- •8.3.3.4 Transfer Result
- •8.3.3.5 Abort Transfer
- •8.4 DWA Interfaces, Descriptors and Control
- •8.4.1 DWA Isochronous Streaming Interface
- •8.4.2 DWA Isochronous Streaming Overview
- •8.4.3 DWA Descriptors
- •8.4.3.1 Device Descriptor
- •8.4.3.2 Binary Device Object (BOS) Descriptor
- •8.4.3.3 Configuration Descriptor
- •8.4.3.4 Security Descriptors
- •8.4.3.5 Interface Association Descriptor
- •8.4.3.6 Data Transfer Interface Descriptor
- •8.4.3.7 Wire Adapter Class Descriptor
- •8.4.3.8 Notification Endpoint Descriptor
- •8.4.3.9 Notification Endpoint Companion Descriptor
- •8.4.3.10 Data Transfer Write Endpoint Descriptor
- •8.4.3.11 Data Transfer Write Endpoint Companion Descriptor
- •8.4.3.12 Data Transfer Read Endpoint Descriptor
- •8.4.3.13 Data Transfer Read Endpoint Companion Descriptor
- •8.4.3.14 Isochronous Streaming Interface Descriptor
- •8.4.3.15 Isochronous Streaming OUT Endpoint Descriptor
- •8.4.3.16 Isochronous Streaming OUT Endpoint Companion Descriptor
- •8.4.3.17 Isochronous Streaming IN Endpoint Descriptor
- •8.4.3.18 Isochronous Streaming IN Endpoint Companion Descriptor
- •8.4.3.19 Wire Adapter RPipe Descriptor
- •8.4.4 DWA Specific Requests
- •8.4.4.1 Clear Port Feature
- •8.4.4.2 Get Port Status
- •8.4.4.3 Set Isochronous Endpoint Attributes
- •8.4.4.4 Set Port Feature
- •8.4.5 DWA Notification Information
- •8.4.5.1 Remote Wake
- •8.4.5.2 Port Status Change
- •8.4.6 DWA Isochronous Transfers
- •8.4.6.1 DWA Isochronous OUT Responsibilities
- •8.4.6.2 DWA Isochronous IN Responsibilities
- •8.5 HWA Interfaces, Descriptors and Control
- •8.5.1 HWA Isochronous Streaming Overview
- •8.5.2 HWA Descriptors
- •8.5.2.1 Device Descriptor
- •8.5.2.2 Device_Qualifier Descriptor
- •8.5.2.3 Configuration Descriptor
- •8.5.2.4 Other_Speed_Configuration Descriptor
- •8.5.2.5 Security Descriptors
- •8.5.2.6 Data Transfer Interface Descriptor
- •8.5.2.7 Wire Adapter Class Descriptor
- •8.5.2.8 Notification Endpoint Descriptor
- •8.5.2.9 Data Transfer Write Endpoint Descriptor
- •8.5.2.10 Data Transfer Read Endpoint Descriptor
- •8.5.2.11 Wire Adapter RPipe Descriptor
- •8.5.3 HWA Specific Requests
- •8.5.3.2 Get BPST Adjustment
- •8.5.3.3 Get BPST Time
- •8.5.3.4 Get WUSB Time
- •8.5.3.5 Remove MMC IE
- •8.5.3.6 Set Device Encryption
- •8.5.3.7 Set Device Info
- •8.5.3.8 Set Device Key
- •8.5.3.9 Set Group Key
- •8.5.3.10 Set Num DNTS Slots
- •8.5.3.11 Set WUSB Cluster ID
- •8.5.3.12 Set WUSB MAS
- •8.5.3.13 Set WUSB Stream Index
- •8.5.3.14 WUSB Channel Stop
- •8.5.4 HWA Notification Information
- •8.5.4.1 BPST Adjustment Change
- •8.5.4.2 DN Received Notification
- •8.5.5 HWA Isochronous Transfers
- •8.5.5.1 HWA Isochronous OUT Responsibilities
- •8.5.5.2 HWA Isochronous IN Responsibilities
- •8.5.5.3 HWA Isochronous Transfer Completion
- •8.6 Radio Control Interface
- •8.6.1 Radio Control Descriptors
- •8.6.1.1 Radio Control Interface Descriptor
- •8.6.1.2 Radio Control Interface Class Descriptor
- •8.6.1.3 Radio Control Interrupt Endpoint Descriptor
- •8.6.2 Radio Control Command
- •8.6.2.1 Channel Change
- •8.6.2.2 Device Address Management
- •8.6.2.4 Reset
- •8.6.2.5 Scan
- •8.6.2.6 Set Beacon Filter
- •8.6.2.9 Set Notification Filter
- •8.6.2.10 Set TX Power
- •8.6.2.11 Sleep
- •8.6.2.12 Start Beaconing
- •8.6.2.13 Stop Beaconing
- •8.6.3 Radio Control Notifications
- •8.6.3.1 Application-specific Probe IE Received Notification
- •8.6.3.2 Beacon Received Notification
- •8.6.3.3 Beacon Size Notification
- •8.6.3.4 BPOIE Change Notification
- •8.6.3.5 BP Slot Change Notification
- •8.6.3.6 BP Switch IE Received Notification
- •8.6.3.7 Device Address Conflict Notification
- •8.6.3.8 DRP Availability Changed Notification
- •8.6.3.9 DRP Notification
- •A.1 Key Derivation
- •A.2 Handshake MIC calculation
- •A.3 Secure MMC (EO = payload length)
- •A.4 Data IN from device (EO = 2)
- •B.1 Descriptors for DWA
- •B.2 Descriptors for HWA
Chapter 2 |
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Terms, Conventions and References |
Wireless Universal Serial Bus Specification, Revision 1.0 |
Chapter 2
Terms, Conventions and References
2.1 |
Terms |
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ACK |
Acknowledgment, usually in the context of a protocol handshake packet |
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ASIE |
Application Specific Information Element |
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AES |
Advanced Encryption Standard – FIPS publication 197 |
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BER |
Bit Error Rate (really low for wired environments, really high for wireless |
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environments). |
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BOS |
Binary device object store |
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BP |
Beacon Period. Physical channel time during which the MAC Layer will |
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transmit a beacon packet |
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BPOIE |
Beacon Period Occupancy Information Element. This is an information |
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structure defined in reference [3]. It is used in keeping track of members of |
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a beacon period. |
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BPST |
Beacon Period Start Time. The super-frame reference time at which a |
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MAC Layer compliant device determines is the start of the super-frame. |
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PER |
Packet Error Rate (also really low for wired environments, really high for |
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wireless environments). |
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CC |
Connection Context, including CHID,CDID and CK |
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CCM |
Counter with CBC-MAC – A mode of operation built on AES |
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CDID |
Connection Device ID |
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CHID |
Connection Host ID |
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CK |
Connection Key |
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CSMA/CA |
Carrier sense multiple access with collision avoidance. |
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CTA |
Channel Time Allocation |
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CRC |
Cyclic Redundancy Check |
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DATA |
Packet ID value indicating the associated packet is a data packet. |
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DID |
Device ID, either CHID or CDID |
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DN |
Device Notification |
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DNonce |
Used in the definition of the four-way handshake to refer to a nonce |
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generated by the device |
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DNTS |
Device Notification Time Slot |
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DR |
Data Receive; usually used in the context of a Wireless USB channel time |
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slot during which a particular function endpoint is assigned to received |
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transmissions from the host. |
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DRD |
Dual-Role-Device |
5
Chapter 2 |
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Terms, Conventions and References |
Wireless Universal Serial Bus Specification, Revision 1.0 |
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DRD-Device |
Dual-Role-Device in its role of a Wireless USB Device |
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DRD-Host |
Dual-Role-Device in its role of a Wireless USB Host |
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DRP |
Distributed Reservation Protocol (part of the MAC Layer constructs) |
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DT |
Data Transmit; usually used in the context of a Wireless USB channel time |
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slot during which a particular function endpoint is assigned to transmit |
|
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data packet(s). |
|
DWA |
Device Wire Adapter |
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Endpoint |
A uniquely addressable portion of a USB device that is the source or sink |
|
|
of information in a communication flow between the host and device. |
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FS |
Full Speed (defined in USB 2.0, reference [1]) as 12 Mb/s. |
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FSK |
Fixed Symmetric Key |
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FFI |
Fixed Frequency Interleaving |
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Frame |
Typical nomenclature for communications protocols is that a frame is a |
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packet of transmitted information. In Wireless USB the term Packet is |
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used (see Packet), because in USB Frame is a specific term meaning a 1 |
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millisecond time base for full and low-speed data communications. |
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GTK |
Group Temporal Key |
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HDR |
Shorthand for Header, usually in context of the Wireless USB application |
|
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packet header |
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HNDSHK |
Packet ID value indicating the associated packet is a protocol handshake |
|
|
packet. |
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HNonce |
Used in the definition of the four-way handshake to refer to a nonce |
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generated by the host |
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HS |
High Speed (defined in USB 2.0, reference [1] as 480 Mb/s). |
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HWA |
Host Wire Adapter; defined in this specification as a USB 2.0 connected |
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Wireless USB Host Controller. |
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IAD |
Interface Association Descriptor (defined in USB 2.0, reference [2]). |
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IDATA |
Packet ID value indicating the associated packet is an Isochronous data |
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packet with a defined data stream format. |
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IHV |
Independent Hardware Vendor |
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ISO |
Isochronous |
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ISV |
Independent Software Vendor |
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IE |
Information Element. A unique set of information that is included in its |
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entirety in a data structure, such as a Beacon or MMC packet. |
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KCK |
Key Confirmation Key |
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LLC |
Logical Link Control |
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LQI |
Link Quality Indication |
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MAC Layer |
Media Access Control Layer. In this specification, the MAC Layer is |
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specifically the MBOA MAC [3]. |
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MAS |
Media Access Slot; defined in reference [3] |
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Terms, Conventions and References |
Wireless Universal Serial Bus Specification, Revision 1.0 |
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MBOA |
Multi-Band OFDM Alliance; industry special interest group promoting |
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UWB physical and MAC layer standardization. Merged with WiMedia |
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(see below). |
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MIC |
Message Integrity Code (part of the MBOA secure packet encapsulation). |
|
MIFS |
Minimum Inter-frame Spacing. The minimum time between to successive |
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transmitted packets. For burst-mode transfers, this is the exact required |
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time between successive packet transmissions. |
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MMC |
Micro-scheduled Management Command |
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MS-CTA |
Micro-scheduled CTA |
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MSDU |
MAC Service Data Unit. Information that is delivered as a unit between |
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medium access control service access points. |
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MSTA |
Micro-scheduled Time slot Allocation. |
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NAK |
Negative Acknowledgement; usually in the context of a protocol |
|
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handshake packet |
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Nonce |
A term used by cryptographers to refer to an item that is used one time, |
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such as a random number |
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OFDM |
Orthogonal Frequency Division Multiplexing |
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OOB |
Out-of-band |
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PAL |
Programming Application Layer |
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PC |
Personal Computer |
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PCA |
Prioritized Contention Access |
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P2P-DRD |
The DRD has a Point-to-point link with another DRD |
|
PictBridge |
A Direct Printing Protocol for Digital Still Camera with USB device |
|
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function. |
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PER |
Packet Error Rate |
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PID |
Packet Identifier |
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Pipe |
A logical abstraction representing the association between an endpoint on |
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a device and software on the host. |
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PLCP |
Physical Layer Convergence Protocol |
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PMK |
Pairwise Master Key |
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PK |
Public Key cryptography. |
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PHY |
Physical layer. In this specification, the PHY is specifically the MBOA |
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|
PHY [4]. |
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PRF |
Pseudo-Random Function |
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PTK |
Pairwise Temporal Key |
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RAND |
Reasonable And Non-Discriminatory (usually with regards to licensing |
|
|
intellectual property) |
|
RC |
Replay Counter |
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RCCB |
Radio Control Command Block |
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RCEB |
Radio Control Event Block |
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Chapter 2 |
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Terms, Conventions and References |
Wireless Universal Serial Bus Specification, Revision 1.0 |
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RPipe |
Remote Pipe |
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RSSI |
Received Signal Strength Indication |
|
SC |
Session Context, including CHID, CDID, Session Key and Security Frame |
|
|
Counter[SFC] |
|
SFC |
Secure Frame Counter |
|
SFN |
Secure Frame Number |
|
SIFS |
Short Interframe Spacing. The maximum allowed TX-to-RX or RX-to-TX |
|
|
turnaround time. |
|
SK |
Session Key |
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SOF |
Start Of Frame. The first transaction in a USB 2.0 Frame or Micro-frame. |
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Slotted Aloha |
A contention media access communications protocol technique for |
|
|
reducing the chance of collisions by multiple transmitters by dividing the |
|
|
channel into time slots and stating rules for how individual transmitters |
|
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should select the slots for transmissions. |
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SME |
Security management entity |
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SNR |
Signal to Noise Ratio |
|
SOF |
Start Of Frame |
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STALL |
Handshake code indicating an unrecoverable error on the function |
|
|
endpoint |
|
Super Frame |
The periodic time interval used in the MAC Layer [3] to coordinate packet |
|
|
transmissions between devices. |
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TDMA |
Time Division Multiple Access |
|
TF Code |
Time/Frequency Code |
|
TFI |
Time Frequency Interleaving |
|
TKID |
Temporal Key Identifier (part of the MAC Layer [3] secure packet |
|
|
encapsulation). |
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TPC |
Transmit Power Control |
|
Transaction |
Refers to the combination of MMC plus allocated protocol time slots |
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Group |
(MSTAs) during which one or more Wireless USB transactions are |
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conducted. |
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TrustTimeout |
A timing threshold, measured from the reception of a successfully |
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authenticated packet, after which a device or host must force a re- |
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authentication before resumption of normal “trusted” data |
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communications. |
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USB |
Universal Serial Bus, usually in reference to USB 2.0. |
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UDR |
Unused DRP Response; see reference [3] |
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UWB |
Ultra-wideband , an emerging high data-rate radio standard. |
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WiMedia |
Industry special interest group promoting UWB device standardization. |
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WUSB |
Wireless USB |
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WXCTA |
Wireless USB channel allocation block; X = DNTS, DT, DR |
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