7.2.3 USSD This section requires more descriptive information. I will update this section next.

anisesecretaryMobile - Wireless

Dec 12, 2013 (3 years and 7 months ago)


7.2.3 USSD

This section requires more descriptive information. I will update this section

Cell Broadcast

Cell Broadcast (CB) is a mobile technology that allows messages to be broadcast
to all mobile handsets within a designated

CB me
ssaging can be supported by
most mobile network operators as it is defined by the ETSI’s GSM committee and
楳i灡牴r潦o瑨攠䝓d 獴慮sa牤⸠CB 楳i摥獩s湥搠景f s業畬ua湥潵猠摥汩癥ry 潦o浥獳m来猠
瑯t浵m瑩灬攠畳u牳r楮ia 獰sc楦楥搠area⸠t桥牥a猠瑨攠p桯牴h䵥獳慧e pe

m潩湴 瑯
m潩湴 ⡓䵓
mm⤠楳ia 潮o

潮o a湤n潮o

晥w 獥牶楣eⰠCe汬 B牯rdca獴s楳ia 潮o

浡my 来og牡灨pca汬y⁦潣畳u搠浥獳dg楮g⁳ 牶楣e⸠

䄠Ce汬 B牯rdca獴s 浥獳a来 灡来 c潭灲楳敳o 㠲
Ⱐ睨楣栬h 畳楮u 瑨e 摥晡畬u
c桡牡c瑥t 獥琬t e煵a瑥猠 瑯t 㤳9 c
桡rac瑥牳⸠ 啰r t漠 ㄵ1 潦o 瑨敳e 灡来猠 浡y be
c潮oa瑥ta瑥搠瑯 景fm a Ce汬 B牯a摣a獴 浥獳mge. 䕡ch 灡来 潦 瑨t 浥獳a来 睩汬
桡癥 瑨攠獡浥m浥獳m来 楤敮瑩晩i爠a湤n獥物a氠湵浢敲 睨楣栠楮摥湴楦楥猠瑨攠s潵牣e 潦
瑨攠浥獳mge⸠啳楮g 瑨t猠楮景i浡瑩潮Ⱐ瑨攠浯扩汥l 瑥汥灨
潮o 楳i a扬攠瑯t 楤敮瑩fy and
楧湯牥 b牯r摣a獴s 潦o a汲eady 牥ce楶敤i 浥獳m来献

CB 浥獳mge猠a牥 摩dec瑥搠瑯t
牡摩漠ce汬猬s 牡瑨敲 瑨慮t 瑯t a 獰sc楦楣 瑥t浩湡氮l 䄠Ce汬 B牯r摣a獴s 浥獳mge 楳i a渠
畮u潮晩o浥搠灵獨p 獥牶rceⰠ浥m湩ng 瑨慴t 瑨攠潲楧楮慴潲 潦o 瑨攠浥獳m来 d
歮潷⁷桯⁨h猠sece楶敤⁴桥 獳sgeⰠa汬潷楮o 景f⁳ 牶楣e猠sa獥搠潮⁡湯ny浩ty⸠
楳i 獩s楬a爠瑯t 潴桥o 浡獳m摩獴物扵瑩潮o浥摩m 獵s栠a猠瑥汥瑥t琠潲ooa摩漠䑡瑡t py獴敭

呯T 獵灰潲琠瑨ts 晥a瑵te 瑨t




Ce汬 B牯r摣a獴
Ce湴敲 E
CBC⤠ 瑯t e湡扬e 瑨攠 浡獳m 摩獴物扵瑩潮o 潦o 汯捡氠 楮景i浡瑩潮m t漠 浯扩汥
獵扳捲楢敲猠癩愠瑨攠癡物r畳u扡獥 獴慴楯渠c潮瑲潬oe牳rBpC猠睨楬攠湯琠瑡x楮i 湥瑷潲t

f渠瑨攠de癥汯灥搠睯w汤 CB 瑥t桮潬hgy 楳


畳e搠楮i 摥灬py楮朠汯捡瑩潮
based subscriber services, such as region

local weather

traffic conditions
. CB
can also be used for managing
and communicating
with remote teams

such as

services or volunteers. The emergency services could send an encrypted
message out to all officers or other staff in a certain area to respond to an incident.
Cell Broadcast is ideal for delivering local or regional information which is suited
to all the
people in that area, rather than just one or a few people. Examples include
hazard warnings, cinema programs, local

health concerns flight or bus
delays, tourist information, parking and traffic information.

The main use of this technology in de
veloping nations is for deploying Early
Warning System (EWS) for citizen
s. CB
can be used
warning system


to contact citizens on their
obile phones to warn them of incidents
in a particular area

Some countries
have already adopted this tec

forms of communication like sire
, or radio and TV.


The advantage of this system is that it allows sending messages without
having to know the phone numbers of the users in the region. Instead of
sending a messa
ge to a specific known mobile phone you can send a text to all
mobile phones in a specific zone. Mass communication, very fast, in case it
really matters.

Regardless of network state (congested or not) CB is always available. As
opposed to SMS, CB is part
of the so
called 'low
level' signaling between
handset and network. E.g. in the case of network congestion it will be
impossible to use regular voice and SMS services while CB will remain fully
It is not as affected by traffic load; therefore,

it may be usable
during a disaster when loa
d spikes tend to crash networks.

The CB is a mature systems that has been around for over a decade and robust
to support national public warning systems, examples of national
implementations exist in Japan, Net
herlands and USA
CB is specified in
GSM and in UMTS and will be specified in LTE, the successor of UMTS,
making it future proof.

Every handset including when roaming (example: foreign and national
roaming MVNOs) which is connected to the network receive
s the message.
When someone has the warning service enabled and this person visits another
country, this person will also receive warning messages, provided that this
network also offers the warning service.


Cell Broadcast is a feature of the

network, and some
do not
have the
Cell Broadcast messaging function activated in their network yet,

Yes; every
operator needs to have a Cell Broadcast Centre and CB functionality enabled
in its network to you the service

There are numerous

that do
not have the capability to support cell

Another problem is that the user can switch the receiving of Cell Broadcast
messages option on or off. This means that the operator has no means of
knowing who is receiving the message

There is

a cost to setting up a CB center used to compose and deliver the
messages onto the
network for delivery to the handsets.

Enabling the CB functionality in a handset will lead to increased battery
consumption. In a thesis from the University of Nor
rköping, "Support for Cell
Broadcast as a Global Warning System", the additional battery consumption is
calculated to be very small, especially compared to today's features such as
Bluetooth, Wi
Fi, UMTS, full color displays, and built
in MP3 players, whic
consume far more battery power