Transcript Document 7727988

doc.: IEEE 802.11-00/xxx
Nov. 2003
An Strategy for interworking
between WLAN and cdma2000
Young J. Lee, Kookmin University
Jin H. Lee, Kyungbook University
Yeong M. Jang, Kookmin University
Gi J. Jeon, Kyungbook University
Submission
Slide 1
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
Introduction
• WLAN
– High data bandwidth
– Less mobility
• 3G
– Low data bandwidth
– Support mobility
• Interworking of two networks
– The performance and flexibility of wireless data services would be
dramatically improved
– Issues
• Seamless Handoff
• Adaptive selection between two networks
Submission
Slide 2
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
Interworking approach
• Loosely coupling
– Independent deployment and traffic engineering of
WLAN and 3G networks
– We considered this approach to integration architecture
• Tightly coupling
– WLAN network act as another 3G access network
– By injecting the WLAN traffic directly into the 3G
core, the setup of the entire network, as well as the
configuration and the design of network elements such
as PDSNs have to be modified to sustain the increase
load.
Submission
Slide 3
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
Phase approach
• Phase 0
– Interworking at billing and management of customers both
cdma2000 and WLAN
• Phase 1
– Using multimode device
– Not providing session continuity
• Phase 2a
– Using Mobile IP
– Session continuity
– Need an optimal selection algorithm
• Phase 2b
– Supplemented technologies for fast and seamless handover
Submission
Slide 4
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
Phase approach
• Phase 3a
– Allow the operator to extend 3GPP2 system with PS
based service.
• Phase 3b
– Provided multimedia functionality through packet core
network, as introducing a various multimedia servers.
• Phase 4
– all-IP network is achieved.
Submission
Slide 5
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The existing interface selection
algorithm[6]
• Considered four variables
–
–
–
–
Normalized signal strength, si
Priority, pi
Low threshold, Li
High threshold, Hi
where, i : interface
Submission
Slide 6
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The existing interface selection
algorithm(Cont.)
• Computing the weight wi
– If i is the current interface
1000 pi  2si
wi  
2si
if si  Li
if si  Li
– If i is not the current interface
1000 pi  2si
wi  
2si
if si  H i
if si  H i
• Select the interface that have the highest weight
Submission
Slide 7
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The adaptive interface selection
algorithm
• A point to be considered to use the adaptive interface selection algorithm
cdma2000 1x EV-DO
case 2
2 Mbps
WLANs
Submission
2 Mbps
30 kbps
2 Mbps
0 bps
case 1
Slide 8
144 kbps
case 3
10 kbps
144 kbps
case 4
WLANs
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The adaptive interface selection
algorithm
• Considered variables
–
–
–
–
–
Submission
The required data rates
Authentication
Received power
The limited number of admission users
The charge for the service
Slide 9
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The adaptive interface selection
algorithm
• Decision function
Ds ,i
Ki 
Dr   i
• Cost function
i
: interface  i  WLAN ,cdma2000  
Dr : the required data rate
Ds ,i : the supported data rate of i interface
pi : the price of i interface
Ds ,i
1
Ci 

Dr   i pi
Submission
 i : critical bandwidth ratio
Slide 10
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The adaptive interface selection
algorithm
• The flow chart when users access to the initial interface
START
try to access cdma200 1x
EV-DO
try to access WLAN
link failed
Limited Tx power is received?
No
No
No
No
Limited Tx power is received?
Yes
Yes
Authentication is accepted?
Yes
No
No
Call is admitted?
Authentication is accepted?
Yes
Call is admitted?
Yes
Yes
Optimal Selection Algorithm
END
Submission
Slide 11
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The adaptive interface selection
algorithm
• The detailed flow chart of the optimal selection algorithm part
Optimal Selection Algorithm
No
Yes
Select WLAN
Submission
0  KWLAN  1 & 0  K cdma  1 ?
KW LAN  1 & K cdma  1?
Yes
No
Select i int erface with K X  1
Slide 12
Select i int erface having max Ci
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
The adaptive interface selection
algorithm
• The flow chart when users are moving
START
try to access another system
Limited Tx power is received?
No
Yes
No
Authentication is accepted?
Yes
link failed
No
Call is admitted?
Yes
Optimal Selection Algorithm
END
Submission
Slide 13
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon
doc.: IEEE 802.11-00/xxx
Nov. 2003
Conclusions
• Propose a number of different phases
• Present the interworking strategy
– Fast and seamless handover
– Adaptive selection algorithm
• Propose a number of different deployment scenario
• Propose the interface selection strategy for heterogeneous radio
access networks
• Advantages
– Increasing the number of users who want to connect the interface
in limited area
– Selecting the interface which serves the required data rate of the
user at minimum cost
Submission
Slide 14
Y. J. Lee, J. H. Lee, Y. M. Jang, G.J. Jeon