3. PSTN AND GSM
PSTN
(Public Switched Telephone Network)
GSM
(Global system for Mobile communication)
1] Pstn is basically wire line system.
1] GSM is basically wire less system.
2] Due to wire line system it requires
installation cost.
2] Due to wire less system it does not
requires installation cost.
3] It does not provide mobility and
flexibility .
3] It provide better mobility and flexibility
than PSTN.
4] It is works on only default route .
4] It can be use different route for each
transmission as possible.
5] It not used for long distances .
5] It is used for long distances .
4. PSTN AND GSM
PSTN
(Public Switched Telephone Network)
GSM
(Global system for Mobile communication)
6] Quality of service well defined.
6] Quality of service not well defined.
7] It is developed only for voice not for
data, easy to secure.
7] It is developed for voice as well as
data, less secure than PSTN.
8] Example : ATM, PCM, Frame relay.
8] Example : TCP –IP,
7. EDGE AND GPRS
EDGE (2.75G)
GPRS(2.5G)
(Enhanced Data For Global Evolution)
(General Packet Radio Service)
1] Higher data rate i.e. 384 kbps in
EDGE.
1] Lower data rate than EDGE i.e. 115
kbps in GPRS.
2] In EDGE 8-PSK /GMSK technique is 2] In GPRS GMSK technique is used.
used.
3] EDGE works on Packet and Circuit
switching .
3] GPRS works on only packet
switching.
4] Modulation bit rate is 810 kb/s i.e.3
times the GPRS
4] Modulation bit rate is 270 kb/s
5] Addressing number having size of
2048 bit and window size is 1 to 1024.
5] Addressing number having size of
64 bit and window size is 1 to 128.
8. EDGE AND GPRS
6] In EDGE re-segmentation is
possible.
6] In GPRS re-segmentation is not
possible.
7] In EDGE interleaving is done only
for affected burst.
7] In GPRS interleaving is done for all
burst.
8] Ms and BSS is modified.
8] Ms and BSS is not modified
9. 1G AND 2G
1G
2G
1] 1G is basically developed on
ANALOG system.
1] 2G is basically developed on DIGITAL
system.
2] In 1G only voice and text message
transmission is possible.
2] In 2G voice , text message and data
transmission is possible.
3] 1G provides poor security.
3] 2G provides better security than 1G.
4] 1G works only FDMA technique.
4] 2G works on TDMA and FDMA
technique.
5] 1G has slow data rate i.e.1.9kbps .
5] 2G has High data rate than 1G i.e.13kbps.
10. 1G AND 2G
1G
2G
6] It was introduced in 1980’ s period.
6] It was introduced in 1991’ s period.
7] 1G not providing Roaming and
Handover operations.
7] 2G providing Roaming and Handover
operations.
8] In 1G no BSS AND MSC system
available.
8] In 2G BSS AND MSC systems are
available.
11. 2G AND 3G
2G
3G
1] 2G is works on TDMA , FDMA
technique.
1] 3G is works on TDMA , FDMA as well
as CDMA technique.
2] It has low frequency spacing than 3G
i.e. 0.2Mhz.(narrow B.W)
2] It has high frequency spacing than 2G
i.e. 5Mhz. (Wide B.W)
3] It has low data rate than 3G i.e.13kbps
to56kbps.
3] It has high data rate than 2G i.e.2Mbps.
4] It is used for voice, data only.
4] It is used for voice, data video call.
5] It provides regional roaming and
limited service delivery.
5] It provides global roaming and
global service delivery.
12. 2G AND 3G
2G
3G
6] Less flexible and non spectrum
efficient network .
6] More flexible and spectrum efficient
network.
7] It is used with wireless only.
7] It is used with wireless /wireline
connection.
8] Example :GSM ,IS-136, etc.
8] Example :UMTS,IMT-2000, etc.
13. 4G AND 3G
4G
3G
1] Higher data rate than 3G i.e. 15Mbps100Mbps,more faster than 3G .
1] Lower data rate than 4G i.e. 2-7.5 Mbps,
less faster than 4G .
2] It’s network architecture is wide area
cell based.
2] It’s network architecture is hybrid
integration of wireless LAN(WiFi),Bluetooth, wide area .
3] Bandwidth assign to 4G is 5 – 20 MHz 3] Bandwidth assign to 3G is 100+ MHz
4] 4G works on OFDMA/MC-CDMA.
4] 3G works on TDMA
(GSM),WCDMA/UMTS.
5] 4G based on fully IP and packet
switching .
5] 3G based on circuit +packet switching.
14. 4G AND 3G
4G
3G
6] In 4G improved spectral efficiency,
Quos, broadcast and cellular network.
6] In 3G less improved spectral efficiency,
Quos, broadcast and cellular network.
7] The equipment required to
implement a next generation
network is still very expensive.
7] The equipment required to
implement a 3rd generation
network is less expensive than 4G.
15. CDMA AND GSM
CDMA
(Code Division Multiple Access)
GSM
(Global system for Mobile communication)
1] CDMA basically works on Code
multiplexing technique.
1] GSM basically works on Time and
Frequency multiplexing technique.
2] CDMA having frequency space
1.25Mhz .
2] GSM having frequency space 200khz .
3] CDMA has improve coverage area up
to 20km.
3] GSM has coverage area less than the
CDMA i.e.3.5km.
4] CDMA has improved call quality with 4] GSM has poor call quality with
better sound than GSM.
better sound than CDMA.
5] CDMA is used for high population
density area.
5] GSM is used for less population
density area as compared to CDMA.
16. CDMA AND GSM
CDMA
(Code Division Multiple Access)
GSM
(Global system for Mobile communication)
6] In CDMA in case of handoff there will 6] In GSM in case of handoff there will
be no call drop occur i.e. MBB.
be call drop occur i.e. BBM.
7] Handset is network locked, need to
buy a complete package from the
service provider.
7] Freedom to choose handset from
the market
8] More complex than GSM, Do not
enjoy the freedom like GSM.
8] Less complex than GSM, More freedom
than CDMA.
17. WCDMA AND CDMA
WCDMA
CDMA2000
1] WCDMA has bandwidth is 5Mhz.
1] CDMA2000 has bandwidth is
1.25Mhz
2] WCDMA works on BPSK data
modulation.
2] CDMA works on FW-QPSK ,RV-QPSK
data modulation.
3] In WCDMA power control frequency
is 1500 Hz.
3] In CDMA power control frequency
is 800 Hz.
4] In WCDMA cell searching is done in
4] In CDMA cell searching is done in
3-step approach via primary, secondary Sync through time-shifted short code
search code and CPICH
correlation
5] CDMA has chip rate is 3.84Mcps
5] CDMA has chip rate is 1.22Mcps.
