Radio base station synchronizing responsive to conditions being met
First Claim
1. A mobile communication system comprising:
- a plurality of radio base stations whose system types are different each other;
mobile phones wirelessly connected with the plurality of radio base stations; and
a private branch exchange wired with the plurality of radio base stations, whereinan identical calling code is provided to each reference radio base station designated as belonging to a predetermined radio base station group, and a minimum additional ID is provided to said each reference radio base station designated as belonging to the predetermined radio base station group, where the minimum additional ID provided to said each reference radio base station is different from any other minimum additional ID provided to other reference radio base stations belonging to the predetermined radio base station group;
a given reference radio base station is adapted to receive a frame signal transmitted from another reference radio base station, where the frame signal contains radio synchronous conditions including the calling code of the another reference radio base station which transmitted the frame signal, a reception threshold level which indicates a predetermined satisfactory reception level of the frame signal, and the minimum additional ID of the another reference radio base station which transmitted the frame signal,when the given reference radio base station receives the frame signal containing a control CH signal from the another reference radio base station, the given reference radio base station detects the calling code, the reception threshold level and the minimum additional ID of the another reference radio base station which transmitted the frame signal, on the basis of control information contained in the control CH signal of the frame signal, and determines the another reference radio base station which transmitted the frame signal as a radio base station to be synchronized-to, if all three conditions of;
the calling codes of the another reference radio base station which transmitted the frame signal and the given reference radio base station are identical, the reception threshold level is equal to or more than a predetermined level, and the minimum additional ID level of the another reference radio base station which transmitted the frame signal is smaller than the minimum additional ID level of the given reference radio base station, are met, and responsive to the conditions being met, matches a transmission timing of the frame signal of the given reference radio base station with a transmission position of the control CH signal in the frame signal transmitted from the another reference radio base station, whereby a frame synchronization in a radio section between the given reference radio base station and the another reference radio base station is established.
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Accused Products
Abstract
In the case of radio base stations of different kinds, a synchronization in a radio section cannot be established so that the efficiently effective use of electric waves cannot be retained. According to the invention, therefore, there is provided a TDMA type mobile communication system 100 comprising: a plurality of radio base stations of different system kinds (i.e., a general type radio base station 1, an IP connection type radio base station 10 and a main digital cordless phone 2); mobile phones 5A and 5B wirelessly connected with the plural radio base stations; and a private branch exchange 4 wired with the radio base stations. The radio base station receives, when a synchronized operation mode is decided, a frame signal containing a control CH signal, from a reference radio base station (i.e., a reference station); and times the transmission of the frame signal of a local station to the transmission position of the control CH signal in the frame signal, thereby to establish a frame synchronization in a radio section between own station and the reference radio base station.
12 Citations
11 Claims
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1. A mobile communication system comprising:
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a plurality of radio base stations whose system types are different each other; mobile phones wirelessly connected with the plurality of radio base stations; and a private branch exchange wired with the plurality of radio base stations, wherein an identical calling code is provided to each reference radio base station designated as belonging to a predetermined radio base station group, and a minimum additional ID is provided to said each reference radio base station designated as belonging to the predetermined radio base station group, where the minimum additional ID provided to said each reference radio base station is different from any other minimum additional ID provided to other reference radio base stations belonging to the predetermined radio base station group; a given reference radio base station is adapted to receive a frame signal transmitted from another reference radio base station, where the frame signal contains radio synchronous conditions including the calling code of the another reference radio base station which transmitted the frame signal, a reception threshold level which indicates a predetermined satisfactory reception level of the frame signal, and the minimum additional ID of the another reference radio base station which transmitted the frame signal, when the given reference radio base station receives the frame signal containing a control CH signal from the another reference radio base station, the given reference radio base station detects the calling code, the reception threshold level and the minimum additional ID of the another reference radio base station which transmitted the frame signal, on the basis of control information contained in the control CH signal of the frame signal, and determines the another reference radio base station which transmitted the frame signal as a radio base station to be synchronized-to, if all three conditions of;
the calling codes of the another reference radio base station which transmitted the frame signal and the given reference radio base station are identical, the reception threshold level is equal to or more than a predetermined level, and the minimum additional ID level of the another reference radio base station which transmitted the frame signal is smaller than the minimum additional ID level of the given reference radio base station, are met, and responsive to the conditions being met, matches a transmission timing of the frame signal of the given reference radio base station with a transmission position of the control CH signal in the frame signal transmitted from the another reference radio base station, whereby a frame synchronization in a radio section between the given reference radio base station and the another reference radio base station is established. - View Dependent Claims (2, 3, 4, 5)
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6. A radio base station which communicates with a mobile phone, wherein
an identical calling code provided to all radio base stations designated as belonging to a predetermined radio base station group to which the radio base station belongs, is provided to the radio base station, and a minimum additional ID is provided to the radio base station, where the minimum additional ID provided to the reference radio base station is different from an other minimum additional ID provided to other reference radio base stations belonging to the predetermined radio base station group; -
the radio base station is adapted to receive a frame signal transmitted from another reference radio base station, where the frame signal contains radio synchronous conditions including the calling code of the another reference radio base station which transmitted the frame signal, a reception threshold level which indicates a predetermined satisfactory reception level of the frame signal, and the minimum additional ID of the another reference radio base station which transmitted the frame signal, when the radio base station receives the frame signal containing a control CH signal from the another reference radio base station, the radio base station detects the calling code, the reception threshold level and the minimum additional ID of the another reference radio base station which transmitted the frame signal, on the basis of control information contained in the control CH signal of the frame signal, and determines the another reference radio base station which transmitted the frame signal as a radio base station to be synchronized-to, if all three conditions of;
the calling codes of the another reference radio base station which transmitted the frame signal and the radio base station are identical, the reception threshold level is equal to or more than a predetermined level, and the minimum additional ID level of the another reference radio base station which transmitted the frame signal is smaller than the minimum additional ID level of the radio base station, are met, and responsive to the conditions being met, matches a transmission timing of the frame signal of the radio base station with a transmission position of the control CH signal in the frame signal transmitted from the another reference radio base station, whereby a frame synchronization in a radio section between the radio base station and the another reference radio base station is established. - View Dependent Claims (7, 8, 9, 10)
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11. A frame synchronization establishing method for a mobile communication system comprising:
- a plurality of radio base stations whose system types are different each other;
mobile phones wirelessly connected with the plurality of radio base stations; and
a private branch exchange wired with the plurality of radio base stations, whereinan identical calling code is provided to each reference radio base station designated as belonging to a predetermined radio base station group, and a minimum additional ID is provided to said each reference radio base station designated as belonging to the predetermined radio base station group, where the minimum additional ID provided to said each reference radio base station is different from any other minimum additional ID provided to other reference radio base stations belonging to the predetermined radio base station group; the method comprising; receiving a frame signal transmitted from another reference radio base station at a given reference radio base station, where the frame signal contains radio synchronous conditions including the calling code of the another reference radio base station which transmitted the frame signal, a reception threshold level which indicates a predetermined satisfactory reception level of the frame signal, and the minimum additional ID of the another reference radio base station which transmitted the frame signal, detecting, when the given reference radio base station receives the frame signal containing a control CH signal from the another reference radio base station, the calling code, the reception threshold level and the minimum additional ID of the another reference radio base station which transmitted the frame signal, on the basis of control information contained in the control CH signal of the frame signal, and determining the another reference radio base station which transmitted the frame signal as a radio base station to be synchronized-to, if all three conditions of;
the calling codes of the another reference radio base station which transmitted the frame signal and the given reference radio base station are identical, the reception threshold level is equal to or more than a predetermined level, and the minimum additional ID level of the another reference radio base station which transmitted the frame signal is smaller than the minimum additional ID level of the given reference radio base station, are met, and responsive to the conditions being met, matching a transmission timing of the frame signal of the given reference radio base station with a transmission position of the control CH signal in the frame signal transmitted from the another reference radio base station, whereby a frame synchronization in a radio section between the given reference radio base station and the another reference radio base station is established.
- a plurality of radio base stations whose system types are different each other;
Specification