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Chapter 2

 

Terms, Conventions and References

Wireless Universal Serial Bus Specification, Revision 1.0

Chapter 2

Terms, Conventions and References

2.1

Terms

 

 

ACK

Acknowledgment, usually in the context of a protocol handshake packet

 

ASIE

Application Specific Information Element

 

AES

Advanced Encryption Standard – FIPS publication 197

 

BER

Bit Error Rate (really low for wired environments, really high for wireless

 

 

environments).

 

BOS

Binary device object store

 

BP

Beacon Period. Physical channel time during which the MAC Layer will

 

 

transmit a beacon packet

 

BPOIE

Beacon Period Occupancy Information Element. This is an information

 

 

structure defined in reference [3]. It is used in keeping track of members of

 

 

a beacon period.

 

BPST

Beacon Period Start Time. The super-frame reference time at which a

 

 

MAC Layer compliant device determines is the start of the super-frame.

 

PER

Packet Error Rate (also really low for wired environments, really high for

 

 

wireless environments).

 

CC

Connection Context, including CHID,CDID and CK

 

CCM

Counter with CBC-MAC – A mode of operation built on AES

 

CDID

Connection Device ID

 

CHID

Connection Host ID

 

CK

Connection Key

 

CSMA/CA

Carrier sense multiple access with collision avoidance.

 

CTA

Channel Time Allocation

 

CRC

Cyclic Redundancy Check

 

DATA

Packet ID value indicating the associated packet is a data packet.

 

DID

Device ID, either CHID or CDID

 

DN

Device Notification

 

DNonce

Used in the definition of the four-way handshake to refer to a nonce

 

 

generated by the device

 

DNTS

Device Notification Time Slot

 

DR

Data Receive; usually used in the context of a Wireless USB channel time

 

 

slot during which a particular function endpoint is assigned to received

 

 

transmissions from the host.

 

DRD

Dual-Role-Device

5

Chapter 2

 

 

Terms, Conventions and References

Wireless Universal Serial Bus Specification, Revision 1.0

DRD-Device

Dual-Role-Device in its role of a Wireless USB Device

DRD-Host

Dual-Role-Device in its role of a Wireless USB Host

DRP

Distributed Reservation Protocol (part of the MAC Layer constructs)

DT

Data Transmit; usually used in the context of a Wireless USB channel time

 

slot during which a particular function endpoint is assigned to transmit

 

data packet(s).

 

DWA

Device Wire Adapter

 

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.

FS

Full Speed (defined in USB 2.0, reference [1]) as 12 Mb/s.

FSK

Fixed Symmetric Key

 

FFI

Fixed Frequency Interleaving

 

Frame

Typical nomenclature for communications protocols is that a frame is a

 

packet of transmitted information. In Wireless USB the term Packet is

 

used (see Packet), because in USB Frame is a specific term meaning a 1

 

millisecond time base for full and low-speed data communications.

GTK

Group Temporal Key

 

HDR

Shorthand for Header, usually in context of the Wireless USB application

 

packet header

 

HNDSHK

Packet ID value indicating the associated packet is a protocol handshake

 

packet.

 

HNonce

Used in the definition of the four-way handshake to refer to a nonce

 

generated by the host

 

HS

High Speed (defined in USB 2.0, reference [1] as 480 Mb/s).

HWA

Host Wire Adapter; defined in this specification as a USB 2.0 connected

 

Wireless USB Host Controller.

IAD

Interface Association Descriptor (defined in USB 2.0, reference [2]).

IDATA

Packet ID value indicating the associated packet is an Isochronous data

 

packet with a defined data stream format.

IHV

Independent Hardware Vendor

ISO

Isochronous

 

ISV

Independent Software Vendor

IE

Information Element. A unique set of information that is included in its

 

entirety in a data structure, such as a Beacon or MMC packet.

KCK

Key Confirmation Key

 

LLC

Logical Link Control

 

LQI

Link Quality Indication

 

MAC Layer

Media Access Control Layer. In this specification, the MAC Layer is

 

specifically the MBOA MAC [3].

MAS

Media Access Slot; defined in reference [3]

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Chapter 2

 

 

Terms, Conventions and References

Wireless Universal Serial Bus Specification, Revision 1.0

MBOA

Multi-Band OFDM Alliance; industry special interest group promoting

 

UWB physical and MAC layer standardization. Merged with WiMedia

 

(see below).

 

MIC

Message Integrity Code (part of the MBOA secure packet encapsulation).

MIFS

Minimum Inter-frame Spacing. The minimum time between to successive

 

transmitted packets. For burst-mode transfers, this is the exact required

 

time between successive packet transmissions.

MMC

Micro-scheduled Management Command

MS-CTA

Micro-scheduled CTA

 

MSDU

MAC Service Data Unit. Information that is delivered as a unit between

 

medium access control service access points.

MSTA

Micro-scheduled Time slot Allocation.

NAK

Negative Acknowledgement; usually in the context of a protocol

 

handshake packet

 

Nonce

A term used by cryptographers to refer to an item that is used one time,

 

such as a random number

 

OFDM

Orthogonal Frequency Division Multiplexing

OOB

Out-of-band

 

PAL

Programming Application Layer

PC

Personal Computer

 

PCA

Prioritized Contention Access

 

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

 

function.

 

PER

Packet Error Rate

 

PID

Packet Identifier

 

Pipe

A logical abstraction representing the association between an endpoint on

 

a device and software on the host.

PLCP

Physical Layer Convergence Protocol

PMK

Pairwise Master Key

 

PK

Public Key cryptography.

 

PHY

Physical layer. In this specification, the PHY is specifically the MBOA

 

PHY [4].

 

PRF

Pseudo-Random Function

 

PTK

Pairwise Temporal Key

 

RAND

Reasonable And Non-Discriminatory (usually with regards to licensing

 

intellectual property)

 

RC

Replay Counter

 

RCCB

Radio Control Command Block

RCEB

Radio Control Event Block

 

7

Chapter 2

 

 

Terms, Conventions and References

Wireless Universal Serial Bus Specification, Revision 1.0

RPipe

Remote Pipe

 

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

 

SOF

Start Of Frame. The first transaction in a USB 2.0 Frame or Micro-frame.

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

 

should select the slots for transmissions.

SME

Security management entity

 

SNR

Signal to Noise Ratio

 

SOF

Start Of Frame

 

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.

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).

 

TPC

Transmit Power Control

 

Transaction

Refers to the combination of MMC plus allocated protocol time slots

Group

(MSTAs) during which one or more Wireless USB transactions are

 

conducted.

 

TrustTimeout

A timing threshold, measured from the reception of a successfully

 

authenticated packet, after which a device or host must force a re-

 

authentication before resumption of normal “trusted” data

 

communications.

 

USB

Universal Serial Bus, usually in reference to USB 2.0.

UDR

Unused DRP Response; see reference [3]

UWB

Ultra-wideband , an emerging high data-rate radio standard.

WiMedia

Industry special interest group promoting UWB device standardization.

WUSB

Wireless USB

 

WXCTA

Wireless USB channel allocation block; X = DNTS, DT, DR

8

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