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National Conference on Commun icat ion, Measurement and Control , Vol- I, 14th A ugust, 2012

104

IV. Coding Decoding Protocol

Another important parameter is coding decoding

protocol. By coding decoding procedure network

ensure optimal uses of bandwidth & network

operation speed. The network performance analyse

with following two Codec separately:

a) G.711b) G.729

a) G.711:

G.711 is an ITU-T standard for audio compression. It

is primarily used in telephony. The standard was

released for usage in 1972. Its formal name is Pulse

code modulation (PCM) of voice frequencies. It is

required standard in many technologies, for example

in H.320 and H.323 specifications.

b) G.729:

G.729 is an audio data compression algorithm for

voice that compresses digital voice in packets of 10

milliseconds duration. Because of its low bandwidth

requirements, G.729 is mostly used in Voice over

Internet Protocol (VoIP) applications where

bandwidth must be conserved, such as conference

calls. Standard G.729 operates at a bit rate of 8 kbit/s,

but there are extensions, which provide rates of 6.4

kbit/s and 11.8 kbit/s for worse and better speech

quality, respectively[3,4].

IV. Performance Verification of Network With

Respect to MOS

Performance of network can be determined under one

codec type for all routing protocols for set of nodes.

There are various conditions for caller system and

called system like,

A) Caller is static but Receiver is in mobile state.

B) Caller is movable while Receiver is in staticcondition.

C) Caller & Receiver both in mobile state

Networks Jitter Delay will vary due to above

conditions. These will affect the average MOS.

Analysis for G.711 Codec:


i) Average MOS for Receiver:

Fig 1: Average MOS at Movable Receiver

ii) Average MOS for Transmitter:

Fig 2: Average MOS for static Transmitter

B) Caller is movable while Receiver is in static

condition.

i) Average MOS of Receiver:

Fig 3: Average MOS for static Receiver

ii) Average MOS of Transmitter:

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Fig 4: Average MOS at Movable Transmitter


i) Average MOS of Receiver:

Fig 5: Average MOS for Mobile network Receiver

ii) Average MOS of Transmitter:

Fig 6: Average MOS for Mobile network Transmitter

Analysis for G.729 Codec:


i) Average MOS for Receiver

Fig 7: Average MOS at Movable Receiver

ii) Average MOS for Transmitter

Fig 8: Average MOS for static Transmitter

B) Caller is movable while Receiver is in static

condition.


Fig 9: Average MOS for static Receiver


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Fig 10: Average MOS for Dynamic Transmitter



Fig 11: Average MOS for Mobile Receiver


Fig 12: Average MOS for static ReceivTransmitter

V. Discussion on Results

Comparing all graphs for different Codec different

routing protocol shows better performance. For

mobile receiver at receiving end Bellman Ford shows

best result in G.729 Codec. Jitter value & delay is

optimum. MOS value is present in Y axis and

average set of node in X axis.

Fig 13: Comparing Best Average MOS of Codecs

For Mobile Call initiator RIP routing algorithm

shows better performance MOS value is present in

Y axis and average set of node in X axis.


For both Mobile Caller and Receiver a combination

of OSPF v 2 at receiver end and Bellman Ford at

transmitter end in G.729 codec shows better

performance. Also Jitter values are minimums and

delay is moderated. MOS value is present in Y axis

and average set of node in X axis.

In this dynamic scenario while call initiator and

receiver are mobile then average MOS will not

fluctuate as well as it is above 2 (Fig 15). But

corresponding jitter variation is very low (Fig 16).


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Fig 16: Average Jitter for Receiver

Keeping average MOS value at a threshold 2

optimizing delay and jitter value system can keep

highest MOS 4. As packet loss and corruption of

packet is minimum & delay is average so network

give it optimum performance.

Conclusion

Comparing all performances of G.711 & G.729 with

respect to different routing protocols in different

static & dynamic scenario performance of G.729 is

better than G.711. Among all type of routing

protocols Bellman Ford shows best result at receiver

end while at transmitter end RIP & OSPF v 2 perform

better. Also we can conclude for complete mobile

scenario with moderate network designing cost

system can able to maintain Maximum MOS 4.

REFERENCES

[1] Experimental Study of Voice over IP Servicesover Broadband Wireless Networks AdvancedInformation Networking and Applications, 2008.AINA 2008. Author(s): Peh, E.W.C. Nat. Univ.of Singapore, Singapore Seah, W.K.G. ; Chew,Y.H. ; Ge, Y.

[2] Improving R-score of Adaptive VoIP codec inIEEE 802.16 networks Communications. APCC2008. 14th Asia-Pacific Conference onDate of Conference: 14-16 Oct. 2008 Author(s):Tsung-Yin Lee Dept. of Commun. Eng., Nat.Chung Cheng Univ. Chia-Yi, Chiayi

[3] Integration of IEEE 802.11 WLANs with IEEE802.16-based multihop infrastructure mesh/relaynetworks: A game-theoretic approach to radioresource management Niyato, D.; Hossain, E.

Network, IEEE Volume: 21 , Issue: 3 DigitalObject Identifier: 10.1109/MNET.2007.364253Publication Year: 2007 , Page(s): 6 - 14

[4] A concept for ant-routing with coloredpheromones in wireless mesh networks Umlauft,M. Intelligent Systems, 2008. IS '08. 4thInternational IEEE Conference

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