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Content for  TR 22.908  Word version:  17.0.0

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A.2.2  System modelp. 15

  • System architecture Traffic is calculated, based on the architecture in Figure 4.3-1. The architecture for the traffic analysis is comprised of 300 users in disaster areas and 4,200 users out of disaster area, and node b which has 30 channels in the disaster areas.
Copy of original 3GPP image for 3GPP TS 22.908, Fig. A.2-2: Architecture for the traffic analysis
Figure A.2-2: Architecture for the traffic analysis
(⇒ copy of original 3GPP image)
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  • Connection model between users
Copy of original 3GPP image for 3GPP TS 22.908, Fig. A.2-3: Image of connection model and interval of call establishment trigger
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Connection model between users, i.e. who a user calls to among the other users, is based on BA model. The degree distribution of the BA Model follows a power law. The degree distribution resulting from the BA model is scale free. In the model users do not move from disaster areas to non-disaster areas, and vice versa.
Regarding BA model, average number of users for different time length is 3.3, and an initial network of m0 nodes is 2.
Copy of original 3GPP image for 3GPP TS 22.908, Fig. A.2-4: Degree distribution of the BA Model ( P(k)~P-3 )
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Copy of original 3GPP image for 3GPP TS 22.908, Fig. A.2-5: Scale free network
Figure A.2-5: Scale free network
(⇒ copy of original 3GPP image)
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  • Interval of call establishment trigger An originating user continues to trigger establishment of a call to each terminating user until the calls to all the terminating users can be successfully established. If the one of the terminating users trigger establishment and successfully make it, the originating user ceases trying the establishment of a call to the terminating user. Duration of interval of the trigger is based on Poisson distribution. In the traffic analysis the trigger occurs on average every 10 seconds. After the calls to all the terminating users can be successfully established, the average is to be 1,000 seconds (about 17 minutes)
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A.2.3  Resource allocationp. 17

Channel resource allocation procedure in Node B is based on queuing theory. Duration of holding a channel is based on Poisson distribution. In the traffic analysis average of duration of holding channels is 30 seconds.
Copy of original 3GPP image for 3GPP TS 22.908, Fig. A.2-6: Channel resource allocation
Figure A.2-6: Channel resource allocation
(⇒ copy of original 3GPP image)
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