Method of establishing inter base-station synchronization and mobile radio communicaton system using the method
First Claim
1. A method of establishing synchronization among a plurality of radio base stations forming a mobile radio communication system comprising the steps of:
- transmitting from each of the radio base stations a radio control signal including priority information indicating a synchronization priority of the radio base station, and synchronization establishing information indicating whether synchronization has been established between the radio base station and any other one of the radio base stations; and
establishing synchronization in any one of the radio base stations, which is acting as a receiving base station, when the receiving base station receives the radio control signal transmitted from another transmitting radio base station, with the transmitting base station, provided that the receiving base station has not previously established synchronization, and providing that the priority information included in the received radio control signal indicates that the receiving base station is allowed to establish synchronization with the transmitting base station, and providing that the synchronization establishing information included in the received radio control signal indicates that the transmitting base station has established synchronization; and
changing, when the receiving base station has established synchronization with the transmitting base station, the priority of the receiving base station to the priority of the transmitting base station.
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Accused Products
Abstract
A method for establishing inter-base-station synchronization among a plurality of radio base stations of a mobile radio communication system. Each radio base station transmits a radio frequency control signal including priority information identifying the priority of the transmitting station as it relates to establishing synchronization, and synchronization establishing information indicating whether synchronization has been previously established between the transmitting base station and any other radio base station. The receiving radio base station synchronizes with the transmitting base station if the receiving base station has not previously established synchronization, and based on the priority information contained in the received radio frequency control signal, the receiving station is determined to be allowed to establish synchronization with the transmitting base station, and further if the synchronization establishing information contained in the control signal indicates that the transmitting base station has previously been synchronized. Once the receiving base station synchronizes with the transmitting base station, the priority of the receiving base station is changed to be equal to the priority of the transmitting base station.
123 Citations
30 Claims
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1. A method of establishing synchronization among a plurality of radio base stations forming a mobile radio communication system comprising the steps of:
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transmitting from each of the radio base stations a radio control signal including priority information indicating a synchronization priority of the radio base station, and synchronization establishing information indicating whether synchronization has been established between the radio base station and any other one of the radio base stations; and establishing synchronization in any one of the radio base stations, which is acting as a receiving base station, when the receiving base station receives the radio control signal transmitted from another transmitting radio base station, with the transmitting base station, provided that the receiving base station has not previously established synchronization, and providing that the priority information included in the received radio control signal indicates that the receiving base station is allowed to establish synchronization with the transmitting base station, and providing that the synchronization establishing information included in the received radio control signal indicates that the transmitting base station has established synchronization; and changing, when the receiving base station has established synchronization with the transmitting base station, the priority of the receiving base station to the priority of the transmitting base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A mobile radio communication system comprising a plurality of radio base stations, each performing radio communication with a mobile station in a service zone of the base station, each of said radio base stations comprising:
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means for including, in a radio control signal transmitted from the radio base station, priority information indicating a priority of the base station relating to synchronization establishment, and synchronization establishing information indicating whether synchronization has been established between the radio base station and any other one of the radio base stations; priority determining means operative, when the base station receives the radio control signal from another transmitting radio base station, and when the base station has not established synchronization, for determining whether said transmitting base station is a radio base station with which the base station is allowed to establish synchronization based on said priority information included in said received radio control signal; synchronization establishment determining means for determining whether said transmitting base station has already established synchronization based on said synchronization establishing information included in said received radio control signal; synchronization establishing means operative, when it is determined that the base station is allowed to establish synchronization with the transmitting base station and that said transmitting base station has already established synchronization, for establishing synchronization between the base station and said transmitting base station; and priority changing means operative, when synchronization is established by said synchronization establishing means, for changing the priority of the base station to a new priority corresponding to the priority of the transmitting base station. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A mobile radio communication system having a plurality of radio base stations, each of said radio base stations comprising:
- means for including, in a radio control signal transmitted by the base station, priority information indicating a priority of the base station relating to synchronization establishment and synchronization establishing information indicating whether the base station has established synchronization with another radio base station;
priority determining means for determining, when the base station has not established synchronization with any other one of the radio base stations, whether a comparison of the priority of the base station with the priority indicated by the priority information included in the radio control signal transmitted from another transmitting base station indicates that the base station is allowed to establish synchronization with the transmitting base station; means operative, when the base station is allowed to establish synchronization with the transmitting base station, for establishing synchronization with said transmitting base station when the synchronization establishing information included in the radio control signal transmitted from the transmitting base station indicates that the transmitting base station has established synchronization; and means operative, when the base station has established synchronization with said transmitting base station, for making the priority of the base station the same as the priority of said transmitting base station and including the new priority information in said radio control signal. - View Dependent Claims (26, 27, 28, 29, 30)
- means for including, in a radio control signal transmitted by the base station, priority information indicating a priority of the base station relating to synchronization establishment and synchronization establishing information indicating whether the base station has established synchronization with another radio base station;
Specification