Cypress CY62167EV18 Manual do Utilizador descarregar pdf (Página 19)

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name

server

(DDNS)

service

can be

used

to

allow

users

anywhere

on

the

Internet

to

“?nd”

the

base

station

web

server

222,

even

if

its

IP

address

is

constantly

changing.

A

DDNS

function

can be

provided

to

enable

a

?xed

name

for

the

web

server

so

that

remote

users

on

the

Internet

can

?nd

the

IP

address

of

the

web

server.

In

certain

implementations,

the

base

station

220

can

include

software

that

determines

the

dynamically

changing

IP

address

and

forwards

a

new

IP

address

to

the

DDNS.

This

can

occur

every

time

a

new

IP

address

is

assigned

by

the

local

Internet

Service

Provider

(ISP).

The

software

can

send

the

necessary

updates

to

all

of

the

DDNS

host

names

that

need

it.

The

user

or

remote

client

software

can

use

a

speci?cally

constructed

“domain

name”

and

this

would

be

setup

in

the

DDNS

hosting

site.

Therefore,

if

the

IP

address

is

changed

by

the

local

ISP

then

the

DDNS

updates

the

DNS

records

and

sets

the

TTL

(time

to

live)

to

a

value

that

will

cause

a

propa

gation

of

the

updated

DNS

record

throughout

the

Internet.

There

are

many

common

providers

that

provide

hosting

ser

vices,

such

as

dyndns.org.

Alternatively,

domain

names

can

be

purchased

or

free

ones

can

be

obtained,

but

many

of

the

free

ones

can

have

usage

restrictions.

Additionally,

the

remote

client

250

can

run

on

a

handheld

or

wireless

device,

such

as

a

mobile

phone,

a

personal

digital

assistance

(PDA),

a

smartphone,

or

the

like.

In

one

imple

mentation,

the

base

station

220

can

include

image

optimiza

tion

processing

software

or

hardware

for

relaying

or

trans

mitting

the

captured

images

to

the

remote

client

via a

wireless

application

protocol

(WAP).

For

example,

the

base

station

220

can

perform

image

formatting,

coding

and

communica

tion

in

order

to

optimize

the

image

quality

and

behavior

to

the

characteristics

of

the

network

link

and

the

constrained

nature

(bandwidth/size)

of

the

handheld

device

that

is

running

the

client

viewing

software.

This

image

optimization

processing

can

enable

the

base

station

220

to

only

send

portions

of

the

image

at

a

time

or

only

send

zoomed-in

image

information

(to

best ?t

to

the

smaller

screen

and

lower

network

bandwidth

of

the

handheld

device),

or

send

images

with

lower

resolution or

at

lower

frame

rates.

For

example,

this

feature

can

allow

an

end

user

to

remotely

view

the

output

of

the

wireless

cameras

from

the

convenience

of

a

handheld

device,

such

as

a

mobile

phone.

Remote

view

ing

of

the

wireless

camera

output

from

a

handheld

mobile

device

can

be

offered

as

an

additional

service

to

the

user

from

the

mobile

network

carrier

company

(e.g.,

AT&T).

This

can

create

an

attractive

revenue

generation

opportunity

for

the

mobile

network

carriers.

The

base

station

220

can

also

include

a

low-bandwidth,

low-power

radio

beacon

230

for

communication

with

the

wireless

camera 210

via a

second

wireless

link.

The

second

ary

radio

230

can

be

low

power,

however,

the

timing

of

this

secondary

radio

230

needs

to

be

accurate

in

order

to

use

the

bulk,

high-bandwidth

radio

transmission

ef?ciently.

The

pre

dictability

of

the

secondary

radio

coming

on

and

transmitting

information

may

need

to

be

in

the

order

of

less

than

one

millisecond

response time

in

order

to

avoid

wasting

the

chan

nel

time

of

the

high-bandwidth

bulk

radio.

The

wireless

link

240

can

include

one

or

more

wireless

links.

For

example,

a

?rst

wireless

link

can

be

a

high-band

width

wireless

link

and

a

second

wireless

link

can be

a

low

bandwidth

wireless

link.

In

addition,

the

wireless

link

240

can

be an

RF

connection,

a

low

complexity

LF,

UHF

or

VHF

connection

with

a

baud

rate

of

a

few

to

tens

of

kilobits,

a

Bluetooth

connection,

a

cellular

network,

a

wireless

Ethernet

network,

a

WiFi

network,

or

a

WiMAX

network.

One

example

of

receiver

is

the

Texas

Instrument’s

semi-passive

RFID

product

TMS37122-TR.

Another

implementation

for

20

25

30

35

40

45

50

55

60

65

18

this

type

of

radio

can

be

seen

in,

e.g.,

“Low-power,

super

regenerative

receiver

targets

433-MHz

ISM

ban

”,

as

described

in

page

78

of

the

February-2006

issue

of

Electronic

Design

News.

The

network

260

connecting

the

base

station

220

with

the

remote

client

250

canbe

a

wireless

network

(e. g.,

a

Bluetooth

connection,

a

cellular

network,

a

wireless

Ether

net

network,

a

WiFi

network,

or a

WiMAX

network)

or a

wired

network

(e.g.,

LAN/WAN

network,

or

POE

network).

Several

power

saving

techniques

can

be

used

individually

or

in

combination

to

reduce

the

overall

battery

energy

con

sumption

in

the

wireless

camera.

These

techniques

are

listed

and

explained

in

further

detail

below:

1.

Move

the

camera

web

server

to

the

base

station

and

re-deploy

it

as

a

virtual

web

server.

2.

Cycle

the

image/

sensor

bulk,

hi

gh-bandwidth

data

trans

mission

radio

based

on

the

needs

of

the

data

rate

and

channel

capacity.

3.

Cycle

the

image

capture

module

(hardware

or

software)

based

on

the

most

ef?cient

use

of

the

module

vs.

latency,

start-up/

shut

down

time

and

storage

capacity

needs.

4.

Cycle

the

compression

module

(hardware

or

software)

based

on

the

most

ef?cient

use

of

the

module

vs.

latency,

start-up/

shut

down

time

and

storage

capacity

needs.

5.

Use

of

a

secondary

low-bandwidth

radio

with

a

longer

range

than

the

bulk

radio

for

camera

control

and

status

report

and

triggering

signals.

6.

Activation

of

the

camera

functions

based

on

various

triggering

events.

7.

Use

of

environmental

energy

sources.

8.

Use

of

pulsed

high

ef?ciency

light

emitting

diode

(LED)

devices

to

illuminate the

?eld

of

view.

Energy

Saving

Technique

1:

Move

the

camera

web

server

to

the

base

station

and

re-deploy

it

as

a

virtual

web

server.

One

notable

feature

of

the

wireless

camera

described

in

this

speci?cation

is

that

the

wireless

camera

does

not

directly

service

requests

for

data

received

via a

web

server

or

a

relay

server

mechanism.

This

is

because

there

is

no

need

for

a

web

server

to

be

running

in

the

wireless

camera.

Instead,

data

transmission

can

be

initiated

and

controlled

by

the

burst

trans

mission

store/control

block

of

the

wireless

camera.

A

sub

stantial

power

saving

can

be

achieved

through

this

technique

because

it

eliminates

the

need

for

web

server

functionality

to

be

present

in

the

camera

and

allows

the

link

radio

to

power

down

until

sensor

and

image

data

has

to

be

transferred,

not

when

the

client

application

needs

data.

(See

power

saving

technique

2

below

for

further

discussion.).

However,

through

the

use

of

the

web

server

mechanism

the

camera

data

can

be

available

to client

applications

using

standard

network

means

such

as

IP,

HTTP,

HTTPS,

TCP,

ICMP,

UDP,

SMTP,

FTP,

DHCP,

UPnPTM,

Bonjour,ARP,

DNS,

DynDNS,

802.1X,

and

NTP.

Energy

Saving

Technique

2:

Cycle

the

image/

sensor

data

transmission

radio

based

on

the

needs

of

the

data

rate

and

channel

capacity.

Technique

2

cycles a

high-bandwidth

radio

bursting

data

on

a

periodic

basis

determined

by

a

burst

period.

Between

the

burst

transmissions

the

high-bandwidth

radio

can

be

powered

down.

On

average,

the

energy

needed

to

transfer

data

can

be

optimized.

In

one

implementation,

an

802.11

based

physical

layer

technology

can

be

used

to

transfer

the

bulk

data.

The

physical

layer

technology

used

can

include

broadband

high

ef?ciency

OFDM

modulation

architectures.

The

OFDM

modulation

technique

can

exhibit

low

energy

per

bit

trans

ferred

per

unit

of

range

vs.

other

commonly

used

radio

link

architectures,

such

as

the

80215.4

OOC/FSK

modulation

techniques.

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