Inter-frequency handoff execution method and apparatus in mobile communication system

Claim 2

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.

Claim 3

The method as defined in claim 1 , wherein said frequency search section is inserted into an arbitrary position of said data frame under the agreement of said base station and said mobile terminal.

Claim 4

The method as defined in claim 2 , wherein said handoff execution is determined by comparing frequency strength of said base station currently communicated with said mobile terminal with that of the frequency-searched other base station is executed and then in accordance with the compared result.

Claim 5

The method of claim 1 , wherein the different arrangement pattern in each of the plurality of subframes provides for a time diversity of the data transmission.

Claim 6

The method of claim 1 , further comprising adjusting an energy per bit for each of the subframes.

Claim 7

The method of claim 5 , 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.

Claim 8

The method as defined in claim 6 , wherein determining whether a handoff can be executed comprises comparing frequency strength of a current base station currently with that of a frequency-searched base station.

Claim 9

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 10

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 11

The method as defined in claim 8 , further comprising differentiating transmission patterns of said plurality of subframes from each other, after completion of said frequency search section inserting step.

Claim 12

The method as defined in claim 8 , wherein searching the frequency of the other base station is comprises adjusting a frequency synthesizer in said base station to tune a current frequency to another frequency and executing state check and an initial synchronization of the another frequency.

Claim 13

The method as defined in claim 8 , wherein said frequency search section is formed by the insertion of time (1−α) T frame in the data frame having an arbitrary transmission rate (where, 0≦α≦1).

Claim 14

The method of claim 8 , further comprising transmitting each of the plurality of subframes using a spreading sequence that is different than the spreading sequence used for the other subframes among the plurality of subframes.

Claim 15

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 16

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 17

The method of claim 13 , wherein the energy per bit is adjusted in accordance with a product of a spare energy provided during the search 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.

Claim 18

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 19

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 20

The method as defined in claim 15 , wherein said frequency search section is inserted into an arbitrary position of said data frame under the agreement of said base station and said mobile terminal.

Claim 21

The method of claim 15 , where in each of the subframes has an interleaved pattern that is different from the other subframes.

Claim 22

The method of claim 15 , where in an original data frame is converted to the plurality of subframes for transmission.

Claim 23

The method of claim 18 , wherein the original data frame is demultiplexed into the plurality of subframes.

Claim 24

The method of claim 18 , further comprising receiving the plurality of subframes and multiplexing them into the original data frame.

Claim 25

The method of claim 15 , further comprising adjusting an energy per bit for each of the subframes.

Claim 26

The method of claim 21 , wherein the energy per bit is adjusted in accordance with a product of a spare energy provided during the search 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.

Claim 27

The method of claim 15 , further comprising adjusting an energy per bit for each of the subframes in accordance with a repetition number and a number of subframes.

Claim 28

The method of claim 15 , further comprising 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 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.

Claim 29

The method of claim 15 , further comprising transmitting each of the plurality of subframes using a spreading sequence that is different than the spreading sequence used for the other subframes among the plurality of subframes.

Claim 30

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 31

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 32

The method as defined in claim 26 , wherein transmitting said subframes is executed by the completion of tuning to a frequency of the base station currently communicated with the mobile terminal.

Claim 33

The method as defined in claim 26 , wherein said frequency search section is formed by the insertion of time (1−α) T frame in the data frame having an arbitrary transmission rate(where, 0≦α≦1).

Claim 35

The method of claim 26 , further comprising adjusting an energy per bit for each of the subframes.

Claim 36

The method of claim 30 , wherein the energy per bit is adjusted in accordance with a product of a spare energy provided during the search 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.

Claim 37

The method of claim 26 , further comprising adjusting an energy per bit for each of the subframes in accordance with a repetition number and a number of subframes.

Claim 38

The method of claim 26 , further comprising 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 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.

Claim 39

The method of claim 26 , further comprising transmitting each of the plurality of subframes using a spreading sequence that is different than the spreading sequence used for the other subframes among the plurality of subframes.

Claim 40

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 41

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 42

The apparatus as defined in claim 35 , wherein each of said subframe interleavers is disposed on a rear end of said demultiplexer or on a front end of said demultiplexer as an integrated body therewith.

Claim 43

The apparatus as defined in claim 35 , further comprising a plurality of gain adjusters for adjusting gains of output signals from said plurality of spreaders, said gain adjusters being each disposed on the rear end of said plurality of spreaders or on the front end of said demultiplexer as an integrated body therewith.

Claim 44

The apparatus of claim 35 , further comprising transmitting each of the plurality of subframes using a spreading sequence that is different than the spreading sequence used for the other subframes among the plurality of subframes.

Claim 45

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 46

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 47

The apparatus as defined in claim 39 , wherein each of said subframe deinterleavers is disposed on a rear end of said despreaders or on a rear end of said demultiplexer as an integrated body therewith.

Claim 48

The method of claim 39 , wherein the spreading sequences of each of the plurality of subframes of the frame outputted from said RF receiver are spread using a spreading sequence that is different than the spreading sequence used for the other subframes among the plurality of subframes.

Claim 51

The method of claim 42 , wherein determining whether the handoff can be executed comprises comparing a frequency strength of a current base station with a frequency strength of a frequency-searched base station.

Claim 52

The method of claim 42 , further comprising adjusting an energy per bit for each of the subframes.

Claim 53

The method of claim 42 , further comprising transmitting each of the plurality of subframes using a spreading sequence that is different than the spreading sequence used for the other subframes among the plurality of subframes.

Claim 56

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 57

An inter-frequency handoff execution method in a mobile communication system, comprising: 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.

Claim 58

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 59

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 60

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 61

An inter-frequency handoff execution apparatus in a mobile communication system, comprising: 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.

Claim 64

The method of claim 50 , further comprising transmitting each of the plurality of subframes using a spreading sequence that is different than the spreading sequence used for the other subframes among the plurality of subframes.