Inter-frequency handoff method
AssigneeLG Electronics Inc.
InventorYeong Jong Shin
Life of this patent
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Abstract
An efficient and low cost method for performing inter-frequency handoff in a mobile communication system is implemented in software. As a result, none of the additional hardware required by conventional handoff systems to perform a handoff operation is needed. The inter-frequency handoff method includes as an initial step extracting handoff career data. Then, a threshold value determined from the extracted handoff career data is compared with a signal strength value from a mobile station, which is engaged in a call in a first cell using a non-common frequency with a second cell where handoff is to be performed. A point in time for performing the handoff is then decided based on the comparison. Finally, handoff is executed based on the non-common frequency at the decided point in time.
Claims17
An inter-frequency handoff method in a mobile communication system, with a first base station providing service to mobile stations and a second base station adjacent to the first base station, said method comprising:
- (a) detecting, at the first base station, mobile station handoffs to the second base station, wherein each mobile station has a call established using a common frequency, and extracting handoff career data by accumulating strength of signals used in the detected mobile station handoffs;
- (b) determining a threshold value based upon the extracted handoff career data, comparing the threshold value with a signal strength value received from a mobile station MS having a call established using a frequency not in common with the second base station, and deciding a time point of a handoff based upon a result of the comparison;
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- (c) executing the handoff of the mobile station MS using said non-common frequency according to the decided time point of the handoff.
An inter-frequency handoff method in a mobile communication system with a first call and a second call having a frequency different from the first call, comprising:
- (a) detecting a handoff occurrence of a call using a common frequency between the first cell and the second cell;
- (b) determining a type of a detected handoff and accumulating strengths of signals used by the first cell in executing the detected handoff;
- (c) selecting a call established using a non-common frequency of the first and second cells;
- (d) requesting a pilot strength measurement message from the selected call;
- (e) determining a threshold value utilizing the accumulated strength of signals, comparing the determined threshold value with a magnitude of the received pilot signal strength measurement message, and deciding a time point of the handoff for the selected call;
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- (f) executing the handoff of the selected call from the first cell to the second cell according to the decided handoff time point.
Dependencies are inferred from the claim text.