An Introduction To IP-CDMA System And Its Facilities By Surendra Karmacharya Deputy Manager IP-CDMA Co-ordination Unit
What is an IP-CDMA system?
• IP-CDMA is the Internet Protocol based Code
Division Multiple Access Technology. This
is a Third age (3G) telephony services
which allows coinciding affair of
voice along with data.
IP-CDMA verses GSM along with CDMA 1x System
• GSM along with CDMA 1x is a 2G organization whereas
IP-CDMA is 3G system
• CDMA 2000 1x is evolved from CDMA one(IS-
95) with increased language capacity, along with only
support low rate data services (up to 153.6 kbps).
• IP-CDMA arrangement back both 1x and
EVDO, EVDO(Evolution-Data Optimized) is
a telecommunications grade intended the
wireless spread concerning data by radio
signals, typically intended broadband Internet
access, which can supply travelling broadband
service, the downlink can reach 3.1Mbps and
uplink 1.8Mbps.
• Voice standard is in a more excellent manner within IP-CDMA expected to arrive to
use concerning 4GV (EVRC-B) vocoder.
• IP-CDMA Provides Higher language quantity
and ability compared with GSM.
• IP-CDMA Provides travelling broadband
EVDO data utility with smaller frequency
compared with WCDMA (3G GSM) system.
• BTS command use is comparatively low.
• IP-CDMA can complement countrywide
mobile broadband EVDO data utility over
GSM network, this is the most important
value intended IP-CDMA network
Objectives concerning IP-CDMA Project:
Ø Carpet analysis with CDMA technology
based telephony services
Ø Technology advancement
Ø Furnish enriched data service
Ø Environment welcoming Technology
Ø Affordable services with leading quality
Ø Grab market along with sustain within highly
competitive telecom market
Features concerning IP-CDMA System
IP-CDMA has lots concerning recent features compare to the
existing CDMA 2000 1x system, which are
described below;
1. East along with West both Networks have Core locations
at 2 different sites. In east Network, core
equipment (MSCe, HLRe, SMSC, MGWe, BSCe
etc.) purpose be alive installed at Kathmandu and
Biratnagar. Similarly, within West Network, core
equipment shall be alive installed within Pokhara and
Nepalgunj. Furthermore, BSCe along with MGWe for
Seti along with Mahakali shall be alive installed within Dhangadhi.
By increasing the essence locations we can reduce
the entirety BW requirement from one essence location
to other essence significantly.
2. Call processing time purpose be alive express at the time that language can
be switched from MGW along with individual the signaling
part is processed via MSCe. If allowed, intra call
facility can be alive provided within a MGWe regular if
link amidst MSCe along with MGWe is broken.
3. All the BTS are concerning break kind which helps to
increase the analysis with same RF power
compared to the surviving ones via reducing the
loss within feeder cable significantly.
4. Installation time along with expense is also reduced expected to arrive to
split kind concerning BTS, at the time that it uses feeder cable concerning few
meters to connect Outdoor RF feature to the Antenna.
5. Power use concerning BTS is quite low
compared to the alike kind concerning surviving BTS. It
helps to extend the backup time concerning existing
battery. Even if recent artillery is required, capacity
of artillery requirement shall be alive quite less.
6. New BTS kind supports 240 language subscribers/E1,
which is quite high within compare to the surviving BTS
supporting around 180 language channels/E1 only.
7. MSCe supports the swimming bath(s) functionality between
MSCe installed within two different locations. BSCe can
be linked to MSCe swimming bath(s) which allows working
even if its father or mother MSCe fails (A-flex technology).
8. It can interconnect to IP carriers by Session
Border Controller (SBC).
9. VSAT link is provided, at the time that a backup
Interconnection amidst MSCes within same
network. Signaling gateway (SGW) work with
signaling links on top of satellite.
10. To save the privacy concerning language user on top of the air
interface, it provides latest encryption technology
on language known at the time that CAVE (Cellular
Authentication Voice Encryption) algorithm.
11. It is based in contact with ATCA (Advanced Telecom
Computing Architecture) along with supports smooth
evolution to IMS.
12. MSCe supports Mini A-Flex feature. With this
feature, one BSCe can be alive linked to multiple
MGW concerning one MSCe at the same time, and
multiple MGWs can manage services within the load
sharing mode.
13. It also supports OTAF (Over The Air Function)
services, which can be alive adopted to sanction the
operator to download or update data intended user
handset without the participation concerning the user. It
helps users set required parameters intended access
to related services along with in the interim helps OMC
(operation along with Maintenance Centre) to modify
parameters such at the time that PRL (preferred roaming list),
SID (System ID), NID (Network ID), MIN (Mobile
Identification Number), AKEY (Authentication
Key) along with other user related parameters.
14. All the BTS are concerning break kind which purpose extremely
reduce the warm (up) dissipation inside the room. The
contractor has guaranteed affair concerning the whole amount indoor
unit concerning these BTS without employ concerning either air
condition (AC) or free cooling feature (FCU).
15. 4GV vocoder (EVRC-B) is introduced to enhance
voice standard at 9.6Kbps or regular less.
16. It provides high power IP transmission
solutions with Enhanced CRTP (Compressed
Real Time Transport Protocol) along with RTP
multiplexing within the IP on top of Ethernet networking.
17. With the support concerning IWF (Inter Working Function)
service, it supports G3 fax service.
18. It provides MMS (Multimedia Messaging
Service) concerning 250 Kbytes data per MMS, which
helps user to send multimedia data such at the time that short
audio, video clips along with photographs along in
addition to SMS (Short Message Service) at the time that in
2000 1x system.
19. It provides PTT (push to talk) utility too. Nepal
Telecom intends to test the PTT arrangement in contact with pilot basis.
20. It provides the NMS (Network Maintenance
System) within Kathmandu. It helps to monitor,
control along with topic regular commands to the Core
equipment at the whole amount 5 locations. It helps a lot when
difficult problems arise within the distant core
locations along with experts are not available in contact with time.
21. When the organization is idle along with the fill in contact with a sector
is light, the organization automatically shuts down
some carriers in contact with the sector to lower power
consumption. On each sector, at least one carrier
is never shut down. If a carrier to be alive shutdown is
serving any subscriber, the organization does not shut
it throughout the length of until the whole amount calls in contact with it are complete. Once
the organization decides to shut throughout the length of a carrier,
requests intended accessing the arrangement by this
Facilities included within IP-CDMA System
1. It supports Value Added Services such at the time that CRBT
(Caller Ring Back Tone) which was not there in
the surviving system.
2. It supports lawful interception functionality.
3. Currently, individual two carriers intended language along with one
carrier intended EVDO are within use, whereas this system
utilizes three carriers intended language along with two carriers
for EVDO. The optimum employ concerning carriers will
increase the language along with data ability per BTS.
4. EVDO data utility is being provided in
Kathmandu along with Pokhara with 14 along with 1 BTS
respectively. Whereas, this project is designed
to supply EVDO BTS within the whole amount district
headquarters, prime high system sites along with touristic
areas so at the time that to supply leading data utility to the
customers within each and every nook along with corner.
5. PDSN data rate decreases with extend within voice
user because language along with PDSN user share same
carrier along with language got higher priority. EVDO data
service has separate carrier so it is purely
independent to the language users.
6. Some concerning the sites are proposed with 1x BTS only;
EVDO data users can employ PDSN data utility in
such area automatically. The Bandwidth concerning PDSN
is low compared to EVDO.
