Investing two types of data, the effectiveness and efficiency can be confirmed. One is the channel occupancy within Node B. Channel occupancy means congestion condition. The other is the number of originating users who have not finished the call to all the terminating users. The number is assumed to be number of users who have not confirmed safety of all the relatives and friends.
Data are calculated in three patterns of conditions. Pattern 1 is without access control interval application. Pattern 2 is with access control interval application. Pattern 3 is with access control interval application and with terminating permission with access control barring. Refer to Table A.3-1.
Without terminating permission
with access control barring
With terminating permission
with access control
barring (Note 1)
Without access control interval application
With access control interval application
Considered that 2005 Miyagi earthquake lasted about three hours, duration time of data analysis is 10,000 seconds (about 2hour and 50 minutes) in each pattern. Access class barring with and without interval application is stopped at 5,000 seconds in order to analyse congestion conditions.
Seeing Figure A.3-4, users in pattern 3 have finished confirmation of safety of all the relatives and friends earlier than users in pattern 2.
In sum, access control interval application makes both of the effectiveness from the perspective of producing value to the users and efficiency from the perspective of resource management be enhanced, additionally terminating permission with access control barring makes them be enhanced. Therefore provisioning of communication between the unauthorised users in the disaster areas is effective and efficient.