Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-04-05
2005-04-05
Nguyen, Duc (Department: 2643)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067160, C455S067140
Reexamination Certificate
active
06876851
ABSTRACT:
To shorten a required estimation time while keeping an estimation precision in an object environment given for estimating propagation characteristics with a ray launching method. In the case where a ray is propagated within a given observation area, and collides with a barrier residing on its path, a space in the vicinity of the ray is divided into a plurality of partial spaces until a predetermined condition is satisfied. The space in the vicinity of the ray that is considered to cause a degradation in the estimation precision is divided in reflection until there is less influence of degradation, whereby each of the subdivided partial spaces can be handled individually, so that the estimation precision of radio wave propagation characteristics can be made better than a conventional method. On the other hand, in the case where there is possibly less influence of degradation in the estimation precision, the space is not divided, whereby if a ray is radiated from a transmitting antenna coarsely, the total number of rays is reduced below that of the conventional method, so that a total calculation time taken for a propagation estimation can be shortened.
REFERENCES:
S.Y. Seidel et al., “Site-Specific Propagation Prediction for Wireless In-Building Personal Communication System Design”, IEEE Transactions on Vehicular Technology, vol. 43, No. 4, (Nov. 1994), pp. 878-891 with Abstract.
S. Fortune, “Efficient Algorithms for Prediction of Indoor Radio Propagation”, in Proceeding of the 48thIEEE Vehicular Technology Conference, (May 1998), 572-576 with Abstract.
Furukawa Hiroshi
Watanabe Yoshinori
Nguyen Duc
Sughrue Mion LLP
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