Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 11: Wireless LAN Medium Ac
Information Technology - Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks - Specific Requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: High-Speed Physical Layer in the 5.8GHz Band
1 Scope
This part specifies the media access control (MAC) and physical layer (PHY) specifications of high-speed wireless LAN in the 5.8GHz band.
This part is applicable to the high-speed physical layer of wireless LAN in the 5.8GHz band.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document applies.
GB 15629.11-2003 Information technology - Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks - Specific Requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications
3 Terms and Definitions
For the purposes of this part, the terms and definitions given in GB 15629.11-2003 apply.
4 Abbreviations
In addition to the abbreviations given below, the abbreviations in Clause 4 of GB 15629.11-2003 are applicable to this part.
BPSK Binary Phase Shift Keying
C-MPDU Coded MPDU
FFT Fast Fourier Transform
GI Guard Interval
IFFT Inverse Fast Fourier Transform
OFDM Orthogonal Frequency Division Multiplexing
PER Packet Error Rate
QAM Quadrature Amplitude Modulation
QPSK Quadrature Phase Shift Keying
RMS Root Mean Square
U-NII Unlicensed National Information Infrastructure
5 General
As the revision of GB 15629.11-2003, this part defines the high-speed physical layer specification of wireless LAN in the 5.8GHz band, in which OFDM technology is adopted in the physical layer. This part mainly includes the OFDM PHY specific service parameter list, the OFDM PLCP sublayer, OFDM PLME and OFDM PMD sublayer, etc., and makes some modifications to the MAC layer in GB 15629.11-2003 according to the specific conditions of this part.
Unless otherwise stated, the contents of GB 15629.11-2003 are applicable to this part.
6 Orthogonal Frequency Division Multiplexing (OFDM) PHY Specification for the 5.8GHz Band
6.1 Introduction
This clause specifies the PHY entity for an orthogonal frequency division multiplexing (OFDM) system and the additional contents added to make the basic standard GB 15629.11-2003 of wireless LAN suitable for OFDM PHY. According to the Notice on the Use of 5.8GHz Band (XINBUWU [2002] No.277), the system uses 5.725GHz~5.850GHz band. The OFDM system provides a wireless LAN with data payload communication capabilities of 6, 9, 12, 18, 24, 36, 48, and 54Mbit/s. The support of transmitting and receiving at data rates of 6, 12, and 24Mbit/s is mandatory. The system uses 52 subcarriers that are modulated using binary or quadrature phase shift keying (BPSK or QPSK) or using 16- or 64-quadrature amplitude modulation (16-QAM or 64-QAM). Forward error correction coding (convolutional coding) is used with a coding rate of 1/2, 2/3, or 3/4.
6.1.1 Scope
This subclause describes the PHY services provided to the wireless LAN MAC by the 5.8GHz (bands) OFDM system. The OFDM PHY consists of two protocol functions, as follows:
a) A PHY convergence function, which adapts the capabilities of the PMD system to the PHY service. This function is supported by the PLCP, which defines a method of mapping the PSDUs into a framing format suitable for sending and receiving user data and management information between two or more stations using the associated PMD system.
b) A PMD system whose function defines the characteristics and method of transmitting and receiving data through a WM between two or more stations, each using the OFDM system.
6.1.2 OFDM PHY functions
The 5.8GHz OFDM PHY architecture is depicted in the reference model shown in Figure 11 (in 5.8) of GB 15629.11-2003. The OFDM PHY contains three functional entities: the PMD function, the PHY convergence function, and the layer management function. Each of these functions is described in detail in 6.1.2.1 through 6.1.2.4.
The OFDM PHY service is provided to the MAC through the PHY service primitives described in Clause 12 of GB 15629.11-2003.
6.1.2.1 PLCP sublayer
In order to allow the MAC to operate with minimum dependence on the PMD sublayer, a PHY convergence sublayer is defined. This function simplifies the PHY service interface to the MAC services.
6.1.2.2 PMD sublayer
The PMD sublayer provides a way to send and receive data between two or more stations. This clause is concerned with the 5.8GHz band using OFDM modulation.
6.1.2.3 PHY management entity (PLME)
The PLME performs management of the local PHY functions in conjunction with the MAC management entity (MLME).
6.1.2.4 Service specification method
The models represented by figures and state diagrams are intended to be illustrations of the functions provided. It is important to distinguish between a model and a real implementation. The models are optimized for simplicity and clarity of presentation; the actual method of implementation is left to the discretion of the GB 15629.1101 OFDM-PHY-compliant developer.
The service of a layer or sublayer is the set of capabilities that it offers to a user in the next higher layer (or sublayer). Abstract services are specified here by describing the service primitives and parameters that characterize each service. This definition is independent of any particular implementation.
6.2 OFDM PHY Specific Service Parameter List
6.2.1 Introduction
The architecture of the MAC in this part is intended to be PHY independent. Some PHY implementations require medium management state machines running in the MAC sublayer in order to meet certain PMD requirements. These PHY-dependent MAC state machines reside in a sublayer defined as the MLME. In certain PMD implementations, the MLME may need to interact with the PLME as part of the normal PHY-SAP primitives. These interactions are defined by the PLME parameter list currently defined in the PHY service primitives as TXVECTOR and RXVECTOR. The list of these parameters, and the values they may represent, are defined in the specific PHY specifications for each PMD. This subclause addresses the TXVECTOR and RXVECTOR for the OFDM PHY.
6.2.2 TXVECTOR parameters
The parameters in Table 1 are defined as part of the TXVECTOR parameter list in the PHY-TXSTART.request service primitive.
Table 1 TXVECTOR Parameters
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Abbreviations
5 General
6 Orthogonal Frequency Division Multiplexing (OFDM) PHY Specification for the 5.8GHz Band
6.1 Introduction
6.1.1 Scope
6.1.2 OFDM PHY functions
6.2 OFDM PHY Specific Service Parameter List
6.2.1 Introduction
6.2.2 TXVECTOR parameters
6.2.3 RXVECTOR parameters
6.3 OFDM PLCP Sublayer
6.3.1 Introduction
6.3.2 PLCP frame format
6.3.3 PLCP preamble (SYNC)
6.3.4 SIGNAL field
6.3.5 DATA field
6.3.6 CCA
6.3.7 PLCP data modulation and modulation rate change
6.3.8 PMD operating specifications (general)
6.3.9 PMD transmit specifications
6.3.10 PMD receiver specifications
6.3.11 Transmit PLCP
6.3.12 Receive PLCP
6.4 OFDM PLME
6.4.1 PLME_SAP sublayer management primitives
6.4.2 OFDM PHY MIB
6.4.3 OFDM TXTIME calculation
6.4.4 OFDM PHY characteristics
6.5 OFDM PMD Sublayer
6.5.1 Scope and field of application
6.5.2 Overview of service
6.5.3 Overview of interactions
6.5.4 Basic service and options
6.5.5 PDM_SAP detailed service specification
Annex A (Normative) Protocol Implementation Conformance Statement (PICS) Proforma
A.1 IUT (Implementation of the Protocol under Test) Configuration
A.2 OFDM PHY Functions
Annex B (Normative) ASN.1 Encoding of the MAC and PHY MIB
Annex C (Informative) Examples of Encoding a Frame for OFDM PHYs
C.1 Introduction
C.2 Message
C.3 Generation of the Preamble
C.3.1 Generation of the short sequences
C.3.2 Generation of the long sequences
C.4 Generation of the SIGNAL Field
C.4.1 SIGNAL field bit assignment
C.4.2 Coding the SIGNAL field bits
C.4.3 Interleaving the SIGNAL field bits
C.4.4 SIGNAL field frequency domain
C.4.5 SIGNAL field time domain
C.5 Generating the DATA Bits
C.5.1 Delineating, SERVICE field prepending, and zero padding
C.5.2 Scrambling
C.6 Coding, Interleaving and Mapping of DATA Bits
C.6.1 Coding the DATA bits
C.6.2 Interleaving the DATA bits
C.6.3 Mapping into symbols
C.7 Generating the Additional DATA Symbols
C.8 The Entire Packet
Annex D (Normative) Changes to GB 15629.11-2003
D.1 MAC Sublayer Function
D.1.1 Multirate support
D.2 Layer Management
D.2.1 PLME SAP interface
D.2.1.1 PLME CHARACTERISTICS.confirm
D.2.1.1.1 Function
D.2.1.1.2 Semantics of the service primitive
D.2.1.1.3 When generated
D.2.1.1.4 Effect of receipt
D.2.1.2 PLME-TXTIME.request
D.2.1.2.1 Function
D.2.1.2.2 Semantics of the service primitive
D.2.1.2.3 When generated
D.2.1.2.4 Effect of receipt
D.2.1.3 PLME-TXTIME.confirm
D.2.1.3.1 Function
D.2.1.3.2 Semantics of the service primitive
D.2.1.3.3 When generated
D.2.1.3.4 Effect of receipt
Annex NA (Informative) Comparison between this Part, and ISO/IEC 8802-11:1999/Amd 1:2000 and GB 15629.11-2003 in Clause Number
Figure 1 PPDU Frame Format
Figure 2 Illustration of OFDM Frame with Cyclic Extension and Windowing
Figure 3 Inputs and Outputs of Inverse Discrete Fourier Transform
Figure 4 OFDM Training Structure
Figure 5 SIGNAL Field Bit Assignment
Figure 6 SERVICE Field Bit Assignment
Figure 7 Data Scrambler
Figure 8 Convolutional Encoder (k=7)
Figure 9 Example of the Bit-Stealing and Bit-Insertion Procedure (r = 3/4, 2/3)
Figure 10 BPSK, QPSK, 16-QAM, and 64-QAM Constellation Bit Encoding
Figure 11 Subcarrier Frequency Allocation
Figure 12 Transmitter and Receiver Block Diagram for the OFDM PHY
Figure 13 OFDM PHY Frequency Channel Plan for China and the United States
Figure 14 Transmit Spectrum Mask
Figure 15 Constellation Error
Figure 16 Transmit PLCP
Figure 17 PLCP Transmit State Machine
Figure 18 Receive PLCP
Figure 19 PLCP Receive State Machine
Figure 20 PMD Layer Reference Model
Table 1 TXVECTOR Parameters
Table 2 RXVECTOR Parameters
Table 3 Rate Dependent Parameters
Table 4 Timing Related Parameters
Table 5 Contents of the SIGNAL Field
Table 6 Modulation Dependent Normalization Factor KMOD
Table 7 BPSK Encoding Table
Table 8 QPSK Encoding Table
Table 9 16-QAM Encoding Table
Table 10 64-QAM Encoding Table
Table 11 Major Parameters of the OFDM PHY
Table 12 Regulatory Requirement List
Table 13 Valid Operating Channel Numbers by Regulatory Domain and Band
Table 14 Transmit Power Levels for the United States
Table 15 Allowed Relative Constellation Error Versus Data Rate
Table 16 Receiver Performance Requirements
Table 17 MIB Attribute Default Values/Ranges
Table 18 OFDM PHY Characteristics
Table 19 PMD_SAP Peer-to-Peer Service Primitives
Table 20 PMD_SAP Sublayer-to-Sublayer Service Primitives
Table 21 List of Parameters for the PMD Primitives
Table C.1 The Message
Table C.2 Frequency Domain Representation of the Short Sequences
Table C.3 One Period of IFFT of the Short Sequences
Table C.4 Time Domain Representation of the Short Sequence
Table C.5 Frequency Domain Representation of the Long Sequences
Table C.6 Time Domain Representation of the Long Sequence
Table C.7 Bit Distribution of the SIGNAL Fields
Table C.8 SIGNAL Field Bits after Encoding
Table C.9 SIGNAL FIELD Bits after Interleaving
Table C.10 Frequency Domain Representation of SIGNAL Field
Table C.11 Frequency Domain Representation of SIGNAL Field with Pilots Inserted
Table C.12 Time Domain Representation of SIGNAL Field
Table C.13 First 144 DATA Bits
Table C.14 Last 144 DATA Bits
Table C.15 Scrambling Sequence for Seed 1011101
Table C.16 First 144 Bits after Scrambling
Table C.17 Last 144 Bits after Scrambling
Table C.18 Coded Bits of First DATA Symbol
Table C.19 First Permutation
Table C.20 Second Permutation
Table C.21 Interleaved Bits of First DATA Symbol
Table C.22 Frequency Domain of First DATA Symbol
Table C.23 Polarity of the Pilot Subcarriers
Table C.24 The Entire Packet
Table NA.1 Comparison Between this Part, and ISO/IEC 8802-11:1999/Amd 1:2000 and GB 15629.11-2003 in Clause Number
