Cell search method for inter-system handover in a mobile station
First Claim
1. A method for providing timing information for inter-system handover by an asynchronous base station in a mobile communication system including an asynchronous mobile communication network associated with at least one asynchronous base station using independent synchronization, and a synchronous mobile communication network associated with at least one synchronous base station using synchronization matched with a satellite time, the method comprising:
- acquiring information on the satellite time, and generating a base station frame number (BFN) synchronized to the satellite time and a system frame number (SFN) having a predetermined offset for the BFN for each cell;
generating a system information block including a difference value between the BFN and the SFN; and
transmitting the system information block over a common channel along with the SFN.
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Accused Products
Abstract
A cell search method for handover between an asynchronous mobile communication system'"'"'s base station and a synchronous mobile communication system'"'"'s base station. A border base station, which is an asynchronous base station neighboring a synchronous mobile communication network, acquires information on a GPS satellite time, a reference time of the synchronous mobile communication network, generates base station frame number (BFN) synchronized to the satellite time and a system frame number (SFN) having a predetermined offset for the BFN for each cell, generates a system information block including a difference value between the BFN and the SFN, and transmits the system information block over a common channel along with the SFN. A dual-mode mobile station receives an SFN for each cell and a system information block from the border base station, acquires the satellite time synchronization, extracts a neighbor list of synchronous base stations, including PN offset information, from the system information block, searches a neighbor cell of a synchronous system at times when the PN offsets have elapsed from the satellite time synchronization, and reports the search result to the border base station. The cell search method contributes to rapid and efficient cell search during inter-system handover.
115 Citations
21 Claims
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1. A method for providing timing information for inter-system handover by an asynchronous base station in a mobile communication system including an asynchronous mobile communication network associated with at least one asynchronous base station using independent synchronization, and a synchronous mobile communication network associated with at least one synchronous base station using synchronization matched with a satellite time, the method comprising:
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acquiring information on the satellite time, and generating a base station frame number (BFN) synchronized to the satellite time and a system frame number (SFN) having a predetermined offset for the BFN for each cell;
generating a system information block including a difference value between the BFN and the SFN; and
transmitting the system information block over a common channel along with the SFN. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for performing inter-system handover from an asynchronous base station to a synchronous base station by a mobile station in a mobile communication system including an asynchronous mobile communication network associated with at least one asynchronous base station using independent synchronization, and a synchronous mobile communication network associated with at least one synchronous base station using synchronization matched with a satellite time, the method comprising:
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receiving a system frame number (SFN) of the asynchronous base station for each cell and a system information block from the asynchronous base station over a common channel;
extracting a difference value between a base station frame number (BFN) of the asynchronous base station, synchronized to the satellite time, and the SFN, from the system information block; and
acquiring frame synchronization of the base station synchronized to the satellite time by applying the difference value to the SFN. - View Dependent Claims (9, 10, 11, 12)
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13. A mobile communication system including an asynchronous mobile communication network associated with at least one asynchronous base station using independent synchronization, and a synchronous mobile communication network associated with at least one synchronous base station using synchronization matched with a satellite time, the system comprising:
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at least one border base station associated with the asynchronous mobile communication network, the border base station using synchronization matched to the satellite time and providing timing information for the synchronization; and
a dual-mode mobile station capable of communicating with both the asynchronous mobile communication network and the synchronous mobile communication network, the dual-mode mobile station being synchronized to the timing information provided from the border base station. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification