Low Rate - Wireless PAN (IEEE 802.15.4) - PHY           Home : www.sharetechnote.com

 

 

 

 

 

Physical Layer Constraints

 

Based on 802.15.4 Table 70—PHY constants

Item

Description

Value

Max PHY Packet Size

The maximum PSDU size the PHY shall be able to receive

127 Octats
Turnaround Time

RX-to-TX or TX-to-RX turnaround time

12 Symbol Periods

 

 

Physical Layer Attibutes

 

Based on 802.15.4 Table 71—PHY PIB attributes

Item

Description

Value/Range

Current Channel

The RF channel to use for all following transmissions and receptions

 

Channels Supported

Each entry in the list consists of a channel page and a list of channel numbers supported for that channel page

 

TX Power Tolerance

The tolerance on the transmit power setting, plus or minus the indicated value.

1 dB, 3 dB, 6 dB

TXPower

The transmit power of the device in dBm.

 

CCA Mode

The CCA mode

1~6

Current Page

This is the current PHY channel page. This is used in conjunction with phyCurrentChannel to uniquely identify the channel currently being used.

 

Max Frame Duration

The maximum number of symbols in a frame

 

SHR Duration

The duration of the synchronization header (SHR) in symbols for the current PHY

 

Symbols Per Octet

The number of symbols per octet for the current PHY

0.4, 1.3, 1.6, 2,5.3, 8

Preamble Symbol Length

Zero indicates preamble symbol length is 31, and one indicates that length 127 symbol is used. Present for UWB PHY

0, 1

UWB Data Rates Supported

A list of the data rates available in the operating channel

 

CSS Low DataRate Supported

TRUE indicates that 250 kb/s is supported. Present for CSS PHY

TRUE, FALSE

UWB CoU Supported

TRUE if CoU pulses are supported, FALSE otherwise

TRUE, FALSE

UWB CS Supported†

TRUE if CS pulses are supported, FALSE otherwise

TRUE, FALSE

UWB LCP Supported

TRUE if LCP pulses are supported, FALSE otherwise

TRUE, FALSE

UWB Current Pulse Shape

Indicates the current pulse shape setting of the UWB PHY

MANDATORY, COU, CS, LCP

UWB CoU pulse

Defines the slope of the frequency chirp and bandwidth of pulse. CCh.3–CCh.6 are valid only for wideband UWB channels, e.g., 4, 7, 11, or 15,

CCh.1, CCh.2, CCh.3, CCh.4,CCh.5, CCh.6

UWB CS pulse

Defines the group delay of the continuous spectrum filter. No.3–No.6 are valid only for wideband UWB channels, e.g., 4, 7, 11, or 15

No.1, No.2, No.3, No.4, No.5, No.6

UWB LCP Weight1

The weights are represented in twos-complement form. A value of 0x80 represents –1 while a value of 0x7F represents 1

0x00–0xff

UWB LCP Weight2

The weights are represented in twos-complement form. A value of 0x80 represents –1 while a value of 0x7F represents 1

0x00–0xff

UWB LCP Weight3

The weights are represented in twos-complement form. A value of 0x80 represents –1 while a value of 0x7F represents 1

0x00–0xff

UWB LCP Weight4

The weights are represented in twos-complement form. A value of 0x80 represents –1 while a value of 0x7F represents 1

0x00–0xff

UWB LCP Delay2

The range is from 0 to 4 ns with a resolution is 4/255 = 15.625 ps. For example, a value of 0x00 represents 0 while 0x02 represents 31.25 ps

0x00–0xff

UWB LCP Delay3

The range is from 0 to 4 ns with a resolution is 4/255 = 15.625 ps. For example, a value of 0x00 represents 0 while 0x02 represents 31.25 ps

0x00–0xff

UWB LCP Delay4

The range is from 0 to 4 ns with a resolution is 4/255 = 15.625 ps. For example, a value of 0x00 represents 0 while 0x02 represents 31.25 ps

0x00–0xff

Ranging

TRUE if ranging is supported, FALSE otherwise

TRUE, FALSE

Ranging Crystal Offset

TRUE if crystal offset characterization is supported, FALSE otherwise

TRUE, FALSE

Ranging DPS

TRUE if DPS is supported, FALSE otherwise

TRUE, FALSE

Current Code

This value is zero for PHYs other than UWB or CSS. For UWB PHYs, this represents the current preamble code index in use by the transmitter. For the CSS PHY, the value indicates the subchirp,

0~24

Native PRF

For UWB PHYs, the native PRF. Zero is for non-UWB PHYs; one is for PRF of 4; two is for a PRF of 16; and three is for PHYs that have no preference.

0~3

UWB Scan Bins Per Channel

Number of frequency intervals used to scan each UWB channel (scan resolution). Set to zero for non-UWB PHYs

0–255

UWB Inserted Preamble Interval

The time interval between two neighboring inserted preamble symbols in the data portion, for UWB PHYs operating with CCA mode 6. The resolution is a data symbol duration at a data rate of 850 kb/s for all channels. Set to four for UWB PHY in CCA mode 6; otherwise, set to zero.

0,4

TXR MARKER Offset

A count of the propagation time from the ranging counter to the transmit antenna. The LSB of a time value represents 1/128 of a chip time at the mandatory chipping rate of 499.2 MHz

0x00000000–0xffffffff

RXR MARKER Offset

A count of the propagation time from the receive antenna to the ranging counter. The LSB of a time value represents 1/128 of a chip time at the mandatory chipping rate of 499.2 MHz.

0x00000000–0xffffffff

RFRAME Processing Time

A count of the processing time required by the PHY to handle an arriving RFRAME. The LSB represents 2 ms. The meaning of the value is that if a sequence of RFRAMEs arrive separated by phyRFRAMEProcessingTime, then the PHY can keep up with the processing indefinitely

0x00–0xff

CCA Duration

The duration for CCA, specified in symbols. This attribute shall only be implemented with PHYs operating in the 950 MHz band

0-1000

 

 

PHY Model, Frequency, Data Rate

 

PHY Model

Frequency band

Data Rate

OQPSK

2450 MHz, 915 MHz, 780 MHz

250 kb/s

868 MHz

100 kb/s

BPSK

868 Mhz, 950 MHz

20 kb/s

915 MHz

40 kb/s

ASK

868 MHz

 

915 MHz

 

CSS

2450 MHz

1 Mb/s, 250 kb/s(optional)

UWB

249.6 MHz ~ 749.6 MHz

 

3.1 GHz ~ 4.8 GHz

 

6.0 GHz ~ 10.6 GHz

 

GFSK

 

100 kb/s

 

 

PPDU (PHY Protocol Data Unit)

 

 

 

OQPSK PHY

 

 

 

BPSK PHY

 

 

 

ASK PHY

 

 

 

CSS PHY

 

 

 

UWB PHY

 

 

 

GFSK PHY