Inter-frequency handoff execution method and apparatus in mobile communication system
First Claim
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1. An inter-frequency handoff execution method in a mobile communication system, comprising:
- forming a plurality of subframes from a data frame, each having a data transmission section for transmitting frame data and a frequency search section;
transmitting the plurality of subframes from a base station to an arbitrary mobile terminal;
executing data transmission of the frame data in the data transmission section;
searching a frequency of other base station in the frequency search section; and
determining whether or not handoff is executed in accordance with the searched result, wherein frame data in each of the plurality of subframes is interleaved independently of the other subframes to achieve a different arrangement pattern in each of the plurality of subframes, and wherein a transmitting power of said plurality of subframes is adjusted in accordance with a repetition number and a number of subframes.
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Abstract
An inter-frequency handoff execution method in a mobile communication system according to the present invention includes the steps of: transmitting from a base station a data frame in which a data transmission section and a frequency search section exist to an arbitrary mobile terminal; executing data transmission in the data transmission section; searching a frequency of other base station in the frequency search section; and determining whether or not handoff is executed in accordance with the searched result.
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Citations
52 Claims
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1. An inter-frequency handoff execution method in a mobile communication system, comprising:
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forming a plurality of subframes from a data frame, each having a data transmission section for transmitting frame data and a frequency search section;
transmitting the plurality of subframes from a base station to an arbitrary mobile terminal;
executing data transmission of the frame data in the data transmission section;
searching a frequency of other base station in the frequency search section; and
determining whether or not handoff is executed in accordance with the searched result, wherein frame data in each of the plurality of subframes is interleaved independently of the other subframes to achieve a different arrangement pattern in each of the plurality of subframes, and wherein a transmitting power of said plurality of subframes is adjusted in accordance with a repetition number and a number of subframes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An inter-frequency handoff execution method in a mobile communication system, comprising:
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dividing a data frame which is transmitted from a base station to a mobile station into a plurality of subframes, each one of the plurality of subframes having an interleaved pattern that is different from the other subframes;
generating a frequency search period in each of said plurality subframes;
adjusting a transmission power of said plurality of subframes in accordance with a repetition number and a number of subframes;
spreading and transmitting each of said plurality of subframes using spreading sequences different from each other;
receiving said plurality of subframes and searching a frequency of other base stations during the frequency search period; and
determining whether or not handoff is executed in accordance with the searched result. - View Dependent Claims (9, 10, 11, 12)
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13. An inter-frequency handoff execution method in a mobile communication system, comprising:
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dividing a data frame which is transmitted from a base station to a mobile station into a plurality of subframes, each one of the plurality of subframes having an interleaved pattern that is different from the other subframes;
generating a frequency search period in each of said plurality subframes;
spreading and transmitting each of said plurality of subframes using spreading sequences different from each other;
adjusting a transmission power of said plurality of subframes in accordance with a repetition number;
receiving said plurality of subframes and searching a frequency of other base stations during the frequency search period; and
determining whether or not handoff is executed in accordance with the searched result. - View Dependent Claims (14)
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15. An inter-frequency handoff execution method in a mobile communication system, comprising:
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transmitting from an arbitrary mobile terminal to a corresponding base station a plurality of data subframes, each of the plurality of subframes having a data transmission section and a frequency search section;
executing data transmission in the data transmission section; and
transmitting a reverse link pilot signal and a preamble signal in the frequency search section, wherein each of the plurality of subframes is subjected to interleaving and spreading independently of the other subframes. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An inter-frequency handoff execution method in a mobile communication system, comprising:
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dividing a data frame into a plurality of subframes and inserting a frequency search section into said data frame;
interleaving each of the plurality of subframes independently such that each subframe has a pattern that is different from the other subframes;
spreading said plurality of subframes to spreading sequences different from each other and transmitting the spread subframes;
transmitting the plurality of subframes from an arbitrary mobile terminal to a corresponding base station;
receiving said plurality of subframes to thereby restore one frame; and
transmitting a reverse link pilot signal and a preamble signal in the frequency search section and determining whether or not handoff is executed. - View Dependent Claims (27, 28, 30, 31, 32, 33, 34)
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29. The method of claimed 26, wherein interleaving each of the plurality of subframes independently achieves time diversity in transmission.
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35. An inter-frequency handoff execution apparatus in a mobile communication system, comprising:
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a frame encoder for changing data to be sent to a data frame;
a demultiplexer for dividing the data frame into a plurality of subframes;
a plurality of subframe interleavers for making patterns of said subframes outputted from said demultiplexer different from each other;
a plurality of spreaders for modulating each of said plurality of subframes to different spreading sequences;
a plurality of gain adjusters configured to adjust an energy per bit for each of the plurality of subframes, wherein the energy per bit is adjusted in accordance with a product of a spare energy provided during a search section of the subframe multiplied by an original energy per bit, divided by a product of a number of subframes multiplied by a number of repetitions in the original frame;
an adder for adding each of said plurality of subframes; and
an RF transmitter for transmitting the frame outputted from said adder. - View Dependent Claims (36, 37, 38)
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39. An inter-frequency handoff execution apparatus in a mobile communication system, comprising:
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an RF receiver for receiving a frame transmitted from a transmitter;
a plurality of despreaders for removing spreading sequences of a plurality of subframes of the frame outputted from said RF receiver, each of the subframes having a different spreading sequence;
a plurality of subframe deinterleavers for making patterns of said subframes different from each other;
a multiplexer for restoring said plurality of subframes transmitted from said plurality of despreaders to an original frame;
a frame decoder for decoding the frame outputted from said multiplexer to original data;
a frequency synthesizer for tuning a frequency of other base station;
a searcher for searching the frequency of the other base station; and
a controller for providing the searched frequency information of the other base station to said frequency synthesizer, wherein the transmitter comprises a plurality of gain adjusters configured to adjust an energy per bit for each of the plurality of subframes, wherein the energy per bit is adjusted in accordance with a product of a spare energy provided during a search section of the subframe multiplied by an optical energy per bit, divided by a product of a number of subframes multiplied by a number of repetitions in the original frame. - View Dependent Claims (40, 41)
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42. A method of performing an inter-frequency handoff in a mobile communication system, comprising:
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dividing a data frame into a plurality of sub-frames, each sub-frame having a data component and a searching period;
separately interleaving and spreading each sub-frame for transmission;
transmitting each of the plurality of sub-frames and adjusting a transmitting power of said plurality of subframes in accordance with a repetition number and a number of subframes;
searching for a frequency of a target base station during the searching period of each sub-frame; and
determining whether a handoff can be executed in accordance with a result of the search for a frequency. - View Dependent Claims (43, 44, 45)
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46. A method of performing an inter-frequency handoff in a mobile communication system, comprising:
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dividing a data frame into a plurality of sub-frames, each sub-frame having a data component and a searching period;
separately interleaving and spreading each sub-frame for transmission;
adjusting an energy per bit for each of the subframes, wherein the energy per bit is adjusted in accordance with a product of a spare energy provided during the searching period multiplied by an original energy per bit, divided by a product of a number of subframes multiplied by a number of repetitions in the original frame;
transmitting each of the plurality of sub-frames;
searching for a frequency of a target base station during the searching period of each sub-frame;
determining whether a handoff can be executed in accordance with a result of the search for a frequency.
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47. An inter-frequency handoff execution method in a mobile communication system, comprising:
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dividing a frame of data which is transmitted from a base station to a mobile station into a plurality of subframes applied by a time diversity respectively;
generating a frequency search period into each of said plurality of subframes;
spreading and transmitting each of said plurality of subframes using spreading sequences different from the spreading sequence uses for the other subframes among the plurality of subframes and adjusting a tansmitting power of said plurality of subframes in accordance with a repetition number, a period of information in the subframe, and a number of subframes;
receiving the spread subframes and searching a frequency of other base station in the frequency search period;
determining whether or not a handoff can be executed in accordance with the searched result.
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48. An inter-frequency handoff execution apparatus in a mobile communication system, comprising:
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a frame encoder for changing data to be sent to a data frame;
a demultiplexer for dividing the data frame into a plurality of subframes;
a plurality of subframe interleavers for making patterns of said subframes outputted from said demultiplexer different from each other;
a plurality of spreaders for modulating each of said plurality of subframes to different spreading sequences;
a plurality of gain adjusters configured to adjust an energy per bit for each of the plurality of subframes, wherein the energy per bit is adjusted in accordance with a repetition number and a number of subframes;
an adder for adding each of said plurality of subframes; and
an RF transmitter for transmitting the frame outputted from said adder.
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49. An inter-frequency handoff execution apparatus in a mobile communication system, comprising:
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an RF receiver for receiving a frame transmitted from a transmitter;
a plurality of despreaders for removing spreading sequences of a plurality of subframes of the frame outputted from said RF receiver, each of the subframes having a different spreading sequence;
a plurality of subframe deinterleavers for making patterns of said subframes different from each other;
a multiplexer for restoring said plurality of subframes transmitted from said plurality of despreaders to an original frame;
a frame decoder for decoding the frame outputted from said multiplexer to original data;
a frequency synthesizer for tuning a frequency of other base station;
a searcher for searching the frequency of the other base station; and
a controller for providing the searched frequency information of the other base station to said frequency synthesizer, wherein the transmitter comprises a plurality of gain adjusters configured to adjust an energy per bit for each of the plurality of subframes, wherein the energy per bit is adjusted in accordance with a repetition number and a number of subframes.
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50. A method of performing inter frequency handoff in a mobile communication system, comprising:
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dividing a data frame having a repetition symbol which is transmitted from a base station to a mobile station into a plurality of sub-frames;
generating a frequency searching period into the data frame by spreading the plurality of sub-frames with a sequence set having different spreading sequences respectively;
adjusting an energy per bit for the plurality of sub-frames in accordance with one of a repetition number and a number of subframes;
transmitting the data frame with the frequency searching period on a channel;
receiving and searching a frequency of other base station in the frequency search period; and
determining whether or not handoff is executed in accordance with the searched result. - View Dependent Claims (51)
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52. A method of performing inter frequency handoff in a mobile communication system, comprising:
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dividing a data frame having a repetition symbol which is transmitted from a base station to a mobile station into a plurality of sub-frames;
generating a frequency searching period into the data frame by spreading the plurality of sub-frames with a sequence set having different spreading sequences respectively;
adjusting an energy per bit for the plurality of sub-frames, wherein the energy per bit is adjusted in accordance with a product of a spare energy provided during the search section multiplied by an original energy per bit, divided by a product of a number of subframes multiplied by a number of repetitions in the original frame;
transmitting the data frame with the frequency searching period on a channel;
receiving and searching a frequency of other base station in the frequency search period; and
determining whether or not handoff is executed in accordance with the searched result.
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Specification