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US 6,275,518 B1Granted
Frequency hopping radio LAN system and frequency hopping control method
AssigneeHitachi, Ltd.
InventorsYasuhiro Takahashi, Takeshi Kondou, Susumu Matsui
Life of this patent
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Abstract
A radio LAN system based on a frequency hopping control scheme in which a deviation between frequency hopping timing in a cell and frequency hopping timing in another cell is measured, and as the deviation increases close to such a degree that causes interference, a frequency hopping pattern currently used in the cell is replaced with another frequency hopping pattern, or the order on the frequency hopping pattern is changed to avoid interference between the cells.
Claims41
A frequency hopping radio LAN system comprising:
- a radio base station used in a first cell, said radio base station including:
- means for detecting a deviation of a frequency hopping pattern used in the first cell from a frequency hopping pattern used in another cell, and
- means for instructing a change of the frequency hopping pattern used in the first cell if the detection result indicates that said deviation is beyond a tolerable range;
- and
- a radio terminal responsive to said instruction to use another specified frequency hopping pattern from predetermined hopping timing.
2 more elements
A frequency hopping radio LAN system comprising:
- a radio base station used in a first cell, said radio base station including:
- means for detecting a deviation of a frequency hopping pattern used in the first cell from a frequency hopping pattern used in another cell, and
- means for instructing a change in the order of the frequency hopping pattern used in the first cell if the detection result indicates that the deviation is beyond tolerable range;
- and
- a radio terminal responsive to said instruction to select a hopping frequency from the changed frequency hopping pattern at the next hopping timing.
2 more elements
A frequency hopping radio LAN system comprising:
- a radio base station used in a first cell, said radio base station including:
- means for detecting whether at least part of a frequency hopping pattern used in the first cell matches with a frequency hopping pattern used in another cell, and
- means for instructing a change of the frequency hopping pattern used in the first cell if the detection result indicates that a matching degree is beyond a tolerable range;
- and
- a radio terminal responsive to said instruction to use another specified frequency hopping pattern from predetermined hopping timing.
2 more elements
A frequency hopping radio LAN system comprising:
- a radio base station used in a first cell, said radio base station including:
- means for detecting whether at least part of a frequency hopping pattern used in the first cell matches with a frequency hopping pattern of another cell, and
- means for instructing a change in the order of the frequency hopping pattern used in the first cell a result of the detection indicates that a matching degree is beyond a tolerable range;
- and
- a radio terminal responsive to said instruction to select a hopping frequency from the changed frequency hopping pattern at the next hopping timing.
2 more elements
A frequency hopping control method in a frequency hopping radio LAN system comprising the steps of:
- detecting in a radio base station used in a first cell a deviation of a frequency hopping pattern used in the first cell from a frequency hopping pattern used in another cell;
- instructing from said radio base station to a radio terminal capable of communicating with said radio base station to change the frequency hopping pattern used in the first cell if the detecting result indicates that said deviation is beyond a tolerable range;
- and
- performing communications using another frequency hopping pattern specified by said instruction from predetermined hopping timing.
1 more element
A frequency hopping control method in a frequency hopping radio LAN system comprising the steps of:
- detecting in a radio base station used in a first cell a deviation of a frequency hopping pattern used in the first cell covered by said radio LAN system from a frequency hopping pattern used in another cell;
- instructing from said radio base station to a radio terminal capable of communicating with said radio base station to change the order of the frequency hopping pattern used in the first cell if the detection result indicates that said deviation is beyond a tolerable range;
- and
- performing communications at a hopping frequency on the frequency hopping pattern which was changed as instructed from a predetermined hopping timing.
1 more element
A frequency hopping control method in a frequency hopping radio LAN system comprising the steps of:
- detecting in a radio base station used in a first cell whether at least part of a frequency hopping pattern used in the first cell matches with a frequency hopping pattern used in another cell;
- instructing from said radio base station to a radio terminal capable of communicating with said radio base station to change the frequency hopping pattern used in the first cell if the detection result indicates that a matching degree is beyond a tolerable range;
- and
- performing communications using another frequency hopping pattern specified by an instruction to change from a predetermined hopping timing.
1 more element
A frequency hopping control method in a frequency hopping radio LAN system comprising the steps of:
- detecting in a radio base station used in a first cell whether at least part of a frequency hopping pattern used in the first cell matches with a frequency hopping pattern used in another cell;
- instructing from said radio base station to a radio terminal capable of communicating with said radio base station to change the order of the frequency hopping pattern used in the first cell if the detection result indicates that a matching degree is beyond a tolerable range;
- and
- performing communications at a hopping frequency on the changed frequency hopping pattern at the next hopping timing.
1 more element
Dependencies are inferred from the claim text.