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A Dynamic Channel Allocating Method Adapted to Users Preferences in Circuit Switching of W-CDMA Takayuki Katayama Yoshimi Teshigawara Graduate School of.

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Presentation on theme: "A Dynamic Channel Allocating Method Adapted to Users Preferences in Circuit Switching of W-CDMA Takayuki Katayama Yoshimi Teshigawara Graduate School of."— Presentation transcript:

1 A Dynamic Channel Allocating Method Adapted to Users Preferences in Circuit Switching of W-CDMA Takayuki Katayama Yoshimi Teshigawara Graduate School of Engineering Soka University, Tokyo Japan {tkatayam,teshiga}@soka.ac.jp

2 Introduction Recently a number of browser phones which can transmit data by using cellular phone has been increasing rapidly. Over the 60 millions December in 2002 In 2004, over 84 million people will subscribe to cellular phone MCPC*prediction IP cellular phone subscriber Telecommunications Carriers Association (million) *Mobile Computing Promotion Consortium

3 Proposed System Dynamic channel allocating method in consideration of users requests Extract user preference parameters such as bandwidth, cost, connectivity and sent them to the base station. Allocating channels according to users requests (satisfactory parameters) by using AHP Enable to provide data communications that satisfies users preference requests

4 Procedure of Channel Allocation User DB UserNo UserLevel Bandwidth DB MT BS Policy Server 123 456 7 8 9

5 Specifying User Preferences Specifying operation Use Java application implemented in cellular phone Input of importance levels on users preferences Select a level from most important, more important, important, less important, least important (Importance levels are easily understood) Input data will be sent to the management server at the BS and be evaluated as significant values by using AHP. Input image

6 Channel Allocating Algorithm No Yes No Yes Start communication The connection weights are promoted a higher position Yes No Communication request Remaining channel is enough Calculate AHP The calling loss are higher than a regular time Check the service and the user which currently perform communication Refer to each level of importance which the user perform communication The connection weight is above A point Move to calling loss state calculate AHP Allocate channels which user request Start communication Calculate the users quality value using QDm method Allocate channel which user request.

7 Method to Determine User Quality Use QDm (Quality Deployment for Market pricing) method which applies AHP and value engineering Present Quality Ideal Quality Evaluation Weight Bandwidth5542 Connectivity5532 Cost4523 Image Quality353 Evaluation Value4.715100 Quality0.9421 Evaluated by AHP Valuation of satisfactory level regarding bandwidth and cost, connectivity User quality is determined

8 Valuation of Satisfactory Level Regarding Bandwidth, Cost and Connectivity proper figure High satisfaction It falls rapidly It falls gently cost Quality value 0 1 2 3 4 5 0 1 2 3 4 5 Acquired Channels Quality value Fig. 2 Satisfactory level of Bandwidth Fig 3. Satisfactory level of Cost Fig. 1 Figure using proper figure

9 Simulation The range of bandwidth available is 32kbps 128kbps 1024kbps BS MT ATM Network SLA levelMost important itemImportant item Level 1BandwidthConnectivity Level 2BandwidthCost Level 3ConnectivityBandwidth Level 4ConnectivityCost Level 5CostBandwidth Level 6CostConnectivity Table 1. Importance level of user preference

10 Fig. 4 Average acquired bandwidth of each level (λ=4.05) Fig. 1 Comparison of each level with calling loss rate Fig. 2 Comparison of each level with average acquired bandwidth Simulation Results(1) calling interval call/sec Calling loss rate (%) Acquiring bandwidth (kbps) Request channels (kbps) Acquiring bandwidth (kbps) Calling loss rate (%) Fig. 3 Relationship between cost and average calling loss rate λ= calling rate (per sec)

11 Fig. 5 Relationship between user satisfaction levels and calling interval Fig. 6 Comparison of each importance parameter with user satisfaction level Simulation Results(2) λ= calling rate calling interval call/sec user satisfactory levels(%

12 Conclusion We realize that the proposed system is effective for users who want to acquire enough bandwidth, to establish connection even under heavy traffic, and to make reasonable communications to guarantee items which users request preferentially. 1.Guarantee of End-to-End QoS 2.Comparison in the case of packet switching method applying proposed system Future works


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