Telecommunications – Transmitter and receiver at separate stations
Patent
1993-09-01
1995-04-18
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 331, 455 561, 455 62, H04B 726, H04Q 722, H04Q 738
Patent
active
054086841
ABSTRACT:
In the selection of a control channel of a mobile station in a radio zone to which some control channels are assigned as communication channels, the receiving levels of the control channels are sequentially measured and control channel candidates are selected. A check is made to see if a control signal can correctly be received in each of the selected control channel candidates, and if not, the number of signal reception failures in that channel is incremented by 1 in a memory used by the mobile rotation. A channel in which the number of signal reception failures has reached a predetermined value M (an integer equal to or greater than 1) is excluded from the group of control channel candidates, and the other selected control channel candidates are similarly checked to determine whether or not the reception of the control signal is possible in each of them. If the control signal can correctly be received in a given control channel, a check is made to see if the mobile station has moved into a different radio zone, and if not, the mobile station enters the state of waiting for an incoming call in that control channel. If the radio zone of the mobile station has changed, the numbers of signal reception failures in all the control channels are reset in the memory, so that all the control channels are made candidates to be selected next as a control channel of the radio zone in which the mobile station is currently located.
REFERENCES:
patent: 4750198 (1988-06-01), Harper
patent: 4903320 (1990-02-01), Hanawa
"Quick Call Scan Algorithm", by B. Moselle et al, Motorola Tech. Dev., vol. 16, Aug. 1992.
Kobayashi Katsumi
Nagata Kiyohito
Yunoki Kazufumi
Eisenzopf Reinhard J.
NTT Mobile Communications Network Inc.
Pham Chi H.
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