KR100652033B1 - Code combining and packet combining handoff for 3-way handoff region - Google Patents

Abstract

In the 3-PCA handoff region, the CCC handoff method is a code combining and packet combining handoff method of a mobile terminal communicating with a base station having an encoder, and receives from the base station. Transmitting a pilot strength measurement message (PSMM) when the strength of the pilot signal is greater than the first predetermined value or when the strength of the pilot signal is smaller than the second predetermined value according to the measured pilot signal. ; A data field indicating a switching time for converting an encoder type of the base station from a preset first type to a preset second type and a second type in which the data field sets the encoder type to a preset first type Receiving a handoff message comprising a first indicator indicating what is to be used to switch to; And transmitting a HCM (Handoff Completion Message).

As described above, the present invention has the advantage that the same code pattern is prevented from being allocated to two base stations during CCPC handoff, so that the terminal always receives signals having different code patterns, thereby obtaining the gain of the CCPC handoff method. have.

Description

CCC handoff method in 3-xyxy handoff region {Code combining and packet combining handoff for 3-way handoff region}

1 is a view for explaining a CCPC handoff method.

2 is a view showing a field of the ESCAM transmitted from the base station to the terminal in the CCPC handoff method.

3 is a flowchart illustrating a CCPC handoff method in a 3-way handoff area according to the present invention.

4 is a view showing a field of the UHDM transmitted from the base station to the terminal in the CCPC handoff method according to the present invention.

5 is a view for explaining the code pattern switching time of the base station and the terminal according to the present invention.

<Explanation of symbols for main parts of the drawings>

101 ... Base Station A 102 ... Base Station B

103.Base station C 105 ... Mobile communication terminal

110a, 110b, 110c ... 2-way handoff zone

120 ... 3-way handoff zone

The present invention relates to a CCPC handoff method in the 3-way handoff region (in other words, Code Combining Soft Handoff (CCSH)), in particular the terminal is a 2-way handoff region in the 3-way handoff region The present invention relates to a CCPC handoff method in a 3-way handoff region that prevents a decrease in gain of CCPC handoff by preventing code patterns from becoming the same when moving to.

In mobile communication, handoff refers to automatically switching the current call channel when moving from one cell to another. These handoffs can be largely divided into hard handoffs and soft handoffs. The hard handoff is a "break before make" method of breaking an existing channel before opening a new call channel, and soft handoff connects a channel first. It can be called "make before break" method that breaks existing channel.

In other words, hard handoff is a handoff method in which a mobile terminal terminates a channel connected to an existing base station and connects to a new channel of a new base station when a mobile station (mobile station) moves from one base station to another. As a handoff, when a mobile terminal (mobile station) approaches a different cell area with the same frequency during a call, the mobile terminal (mobile station) detects that the signal strength of the pilot of the new cell is high enough to move the current room. Informing the cell, the new cell opens the call channel to the mobile communication terminal (mobile station), and the mobile communication terminal (mobile station) opens the call channel with the two cells at the same time to make a call.                         

And, as the mobile terminal gets closer to the new cell, the signal of the previous cell becomes weaker, and if the strength of the signal is lower than a certain level, the mobile terminal (mobile station) informs two cells of the moving room and the previous cell. Hangs up the call to the mobile station and makes the call to the new cell in good condition.

In addition, softer handoff is a handoff between different sectors of one base station, and divides a cell into several sectors and talks in one sector of the same base station and then accesses another sector area in the same manner as a soft hand off. It means to connect.

In the high-speed data transmission system, a CCPC (offload coding and packet dombining) handoff method using turbo coding is used. The CCPC codes one signal using a different coding method, and then transmits the signals. When the CCPC is applied to a handoff, the CCPC handoff method is a method of deciding and combining the signals coded by the different methods. The method can receive and combine the coded signals to gain. At this time, when the terminal receives a signal coded in the same manner, a gain cannot be obtained.
As described above, in the CCPC handoff method, one signal is coded by different coding methods. The one signal may be coded to be distinguished from each other by different code patterns. For example, in the case of turbo coding, if the puncturing pattern PUNCTURE_PATTERN is different, the code pattern is different. When coding is performed with different code patterns, an output of an encoder that performs the coding is different according to each code pattern. Encoders having different outputs with different code patterns may have different encoder types. At this time, one encoder may have different outputs by different code patterns, and in this case, the encoder may have different encoder types.

On the other hand, in the CCPC handoff method, each base station is assigned a cell area for transmitting and receiving signals with the terminal and a PN number that can be distinguished between the base stations, and each base station controls the control station in transmitting and receiving signals with the terminal. Receive a different code pattern.                         

In this case, the terminal receives a signal with a specific code pattern from all base stations in the cell area including the cell. Since there are two code patterns that can be used in the CCPC handoff method, the terminal receives each signal in the 3-way handoff method. Allow duplicates and assign two code patterns.

That is, when the terminal moves between cells, the cell of the base station moves through a two-way or three-way handoff region in which two or three cells overlap each other. Since two code patterns are allocated to the base station, When a signal is received at one base station, one of two code patterns is allocated, and when a signal is received at two base stations, a code pattern different from the code pattern allocated to the one base station is allocated. When receiving signals from three base stations, one of the two code patterns is allocated, so as to allow duplication to each base station, the code pattern is allocated, and the signal is received.

Here, the 2-way and 3-way areas mean how many base stations the terminal receives signals from, and is determined according to the size of the pilot signal received from the base station. If the magnitude is greater than or equal to a certain value, the signal of the base station is additionally received. If the magnitude is less than the specific value, the signal of the base station is dropped so as not to be received, so that 2-way and 3-way areas are determined.

Here, with reference to the accompanying drawings will be described with respect to the movement of the terminal with respect to the conventional CCPC handoff method.                         

1 is a view for explaining a CCPC handoff method, as shown in the base station A (101), base station B (102), base station C (103) PN numbers a, b, c is allocated, and the two-way (110a, 110b, 101c) and 3-way (120) areas simultaneously receiving from two or three base stations (101, 102, 103) are adjacent to the base stations. It will exist.

First, when the mobile communication terminal 105 is operated in the cell region of the base station A 101, the mobile communication terminal 105 receives a signal from the base station A 101, is assigned a code pattern α, and receives the base station A 101 using the α code pattern. Will be received.

At this time, the terminal 105 receives an Extended Supplemental Channel Assignment Message (ESCAM) message to determine which code pattern the terminal 105 and the base station will initially communicate with. The ESCAM is shown in FIG. As described above, a field called PILOT_PN and a field called PUNCTURE_PATTERN (in other words, referred to as 'CCSH_ENCODER_TYPE') are included, and the PILOT_PN means a PN number assigned to each of the base stations 101, 102, and 103. The ESCAM distinguishes which base station a message is received from, and the PUNCTURE_PATTERN indicates which code pattern to use in the corresponding base station. For example, PN a is used for base station A 101 and PN is used for base station B 102. b, PN c is assigned to base station C 103 to distinguish mutual base stations, and if information defined in PUNCTURE_PATTERN is '00', the code pattern is not used. The code pattern of the base station transmitting the CAM is assigned to α, and if it is '10', the code pattern of the base station transmitting the ESCAM is assigned to β.

In this case, since there are two code patterns, at least three cases must be defined including 'unusable' state, and thus the PUNCTURE_PATTERN field requires at least 2 bits.

Of course, at this time, the signal is also received from the base station B 102 and the base station C 103, but the signal is weak and is ignored by the terminal.

As the terminal 105 gradually approaches the base station B 102, the strength of the signal received from the base station B 102 increases, and the terminal 105 pilots the signal received from the base station B 102. It is measured whether the signal strength is greater than or equal to a specific value. When the strength of the pilot signal of the base station B 102 is greater than or equal to a specific value, a code pattern β is assigned to the base station B 102, and the base station A 101 is assigned. Signal from the base station B102 is received from the base station B102.

Here, the fact that the pilot signal of the base station B 102 is greater than or equal to a specific value means that the terminal 105 is a 2-way handoff area 110a which is an area where at least the base station A 101 and the base station B 102 overlap each other. It means that you have entered.

In addition, when the terminal 105 approaches the base station C 103 in the 2-way handoff area 110a of the base station A 101 and the base station B 102, the terminal 105 receives the received information from the base station C 103. When the strength of the signal is increased, and the terminal 105 becomes larger than a specific value of the pilot signal strength of the signal received from the base station C 103, the base station A (101) to the base station C (103) ) Or a code pattern assigned to the base station B (102) is allocated to receive a signal from the base station C (103).                         

Here, of course, the fact that the pilot signal of the base station C 103 is greater than or equal to a certain value means that the terminal 105 is a 3-way area where the base station A 101 and the base station B 102 overlap with the base station C 103. It means that the handoff area 120 has been entered.

If the code pattern α is assigned to the base station C 103, the terminal 105 receives a signal with the α code pattern from the base station A 101 and the base station C 103, and receives the signal from the base station B 102. Is to receive a signal in the β code pattern.

At this time, the terminal 105 receives, decodes and combines signals of different code patterns of the α code pattern and the β code pattern, respectively, to obtain a better quality signal by the diversity effect and gain.

On the other hand, assigning the code pattern to the base station as described above is performed by the control station (not shown) receives the information from each base station, that is, in the two-way handoff region to assign different code patterns, 3 In the -way handoff region, redundancy is allowed to allocate two code patterns to three base stations.

Here, when the terminal 105 moves to the cell area of the base station A 101, the base station B 102, or the base station C 103 in the 3-way handoff area 120, one corresponding to each base station Only the code pattern of is left, and since the signals of the other two base stations are smaller than the specific value of the pilot signal, the signal of the base station is dropped and the terminal receives the signal from one base station.

In addition, the terminal 105 moves from the 3-way handoff area 120 to the 2-way handoff area 110a of the base station A 101 and the base station B 102 or with the base station B 102. Moving to the 2-way handoff area 110b of the base station C 103, the signal of the base station C 103 or the base station A 101 is dropped, so that the terminal 105 is connected to the base station B 102 and the base station. A signal is received from C 103, or from base station A 101 and base station B 102.

At this time, since the base station A 101 and the base station C 103 use an α code pattern, and the base station B 102 uses a β code pattern, signals of different code patterns are received, decoded, and combined, respectively. Therefore, there is no problem in the CCPC handoff method which gains by the diversity effect.

However, when the terminal 105 moves from the 3-way handoff area 120 to the 2-way handoff area 110c of the base station A 101 and the base station C 103, the base station B 102 is located. Signal is dropped, the terminal 105 receives a signal from the base station A (101) and the base station C (103), because the base station A (101) and the base station C (103) both use the α code pattern There is a problem that the benefits of the CCPC handoff method cannot be obtained.

The present invention has been made to achieve the above object, and in the CCPC handoff method, when the mobile communication terminal moves from the 3-way handoff region to the 2-way handoff region, the two base stations of the 2-way handoff region When the code pattern assigned to the same is the same, by changing the code pattern of one of the two base stations of the two-way handoff region to a code pattern different from the code pattern of the other base station, the CCPC handoff method It is an object of the present invention to provide a CCPC handoff method in a 3-way region that can obtain a gain.

A method for transmitting a message for the present invention includes a data field indicating a switching time for converting an encoder type of the base station from a preset first type to a preset second type, and the switching time indicates the encoder type. Constructing a handoff message including a first indicator indicating whether the first type is used to switch from a preset first type to a preset second type; And transmitting the configured handoff message to the mobile terminal.
In the 3-PCA handoff region, the CCC handoff method is a code combining and packet combining handoff method of a mobile terminal communicating with a base station having an encoder, and receives from the base station. Transmitting a pilot strength measurement message (PSMM) when the strength of the pilot signal is greater than the first predetermined value or when the strength of the pilot signal is smaller than the second predetermined value according to the measured pilot signal. ; A data field indicating a switching time for converting an encoder type of the base station from a preset first type to a preset second type and a second type in which the data field sets the encoder type to a preset first type Receiving a handoff message comprising a first indicator indicating what is to be used to switch to; And transmitting a HCM (Handoff Completion Message).
According to an exemplary embodiment of the present invention, a CCC handoff method in a 3-xxx handoff region includes: measuring, by a mobile terminal, a pilot signal received by the mobile station; Transmitting a pilot strength measurement message (PSMM) when the strength of the pilot signal is greater than a first predetermined value or when the strength of the pilot signal is less than a second predetermined value according to the measurement result; A data field indicating a switching time for converting an encoder type of the base station from a preset first type to a preset second type and the data field used to convert the encoder type from the first type to the second type Constructing and transmitting a handoff message to the mobile terminal, the handoff message comprising a first indicator indicating that the information is to be performed; And transmitting, by the mobile terminal, a Handoff Completion Message (HCM) to the base station.
In the present invention, it is preferable that the encoder is a turbo encoder, and it is more preferable that the turbo encoder has different outputs according to the encoder type.
In addition, the output of the turbo encoder is preferably determined by the puncturing pattern (puncturing pattern) of the turbo encoder.
Another detailed feature of the invention is that the handoff message is a Universal Handoff Direction Message (UHDM).
In the present invention, it is preferable that the data field is composed of 6 bits to define 64 switching times. The switching time is preferably defined in units of 80 ms, which is a unit of system time.
Preferably, the first indicator of the present invention is 0 when the data field is not used and 1 when the data field is used, and the handoff message includes information indicating a base station to which the encoder type is switched. More preferably.
In addition, the handoff message preferably includes information indicating the type of encoder to be switched.

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As described above, the present invention has the advantage that the same code pattern is prevented from being allocated to two base stations during CCPC handoff, so that the terminal always receives signals having different code patterns to obtain the gain of the CCPC handoff method. have.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a CCPC handoff method in a 3-way handoff area according to the present invention.

Referring to FIG. 3, in the CCPC handoff method in the 3-way handoff area according to the present invention, first, the terminal measures the strength of each pilot signal received from a plurality of base stations (step 301), and receives the received signal. It is determined whether the strength of the pilot signal received from one base station is greater than or equal to a specific value (step 302). As a result of the determination in step 302, if the received pilot signal is greater than or equal to a specific value, a new code pattern is allocated to the base station and a signal is received from the base station (step 303).

At this time, the terminal receives all signals from adjacent base stations, but receives signals only from the base station whose pilot signal strength is greater than or equal to a certain value and ignores signals from other base stations.

In addition, the code pattern is allocated to the base station as described above is performed by the control station (not shown) receives the information from each base station, that is, in the 2-way handoff region to assign different code patterns, 3 In the -way handoff region, redundancy is allowed to allocate two code patterns to three base stations.

In addition, the terminal determines whether there is a signal that is reduced to less than a specific value among base station signals whose received pilot signal strength is greater than or equal to a specific value (step 304). As a result of the determination of step 304, the strength of the pilot signal is less than a specific value. If there is a base station signal that is reduced by, the signal of the base station is dropped and no signal is received from the base station (step 305).

When the signal of one of the base stations is dropped, it is determined whether the terminal is in the 2-way handoff area after dropping the base station signal (step 306).

Here, determining whether the terminal is in the 2-way handoff area is that if the terminal is in the 2-way handoff area after dropping the signal of any one of the base stations, the terminal is previously located in the 3-way handoff area, That is, it means that the signal was received from three base stations.

As a result of the determination of step 306, when the terminal is in the 2-way handoff region, since the signal is received from two base stations, it is determined whether the code patterns allocated to the two base stations are the same (step 307). If the code patterns allocated to the two base stations are the same, the code pattern of one base station is converted into a code pattern different from that of the other base station (step 308), whereby the two base stations are coded with different code patterns. The signal is transmitted, and the terminal receives, decodes, and combines the signals coded by the two code patterns to obtain the gain of the CCPC handoff method by the diversity effect.

Further, as a result of the determination in step 306, when the terminal is not in the 2-way handoff area, the terminal is receiving a signal from one base station in the 2-way handoff area, or when the terminal receives any signal from any base station. Since a signal cannot be received, when a signal is received from two base stations, if a strength of a pilot signal received from another base station in addition to the two base stations is greater than or equal to a specific value, a new code pattern is allocated to the base station. A signal is received from three base stations by receiving a signal, and when the strength of the pilot signal received from the two base stations is less than a specific value, the signal of the base station is dropped to receive a signal from one base station.

In addition, when receiving a signal from one base station, if the strength of the pilot signal received from another base station in addition to the base station is more than a specific value, by assigning a new code pattern to the base station to receive additional signals two or three Receive a signal from a base station.

On the other hand, when switching the code pattern of one base station to another code pattern as described above, it is necessary to match the time for switching the code pattern between the base station and the terminal, which is the same code as the code pattern of the base station in the terminal This is to decode and receive the specific code pattern transmitted from the base station in the same code pattern so that the terminal can receive the same code pattern.

Therefore, when switching the code pattern of the base station signal, the code pattern switching time is set to match the operation of the base station and the terminal so that the base station and the terminal simultaneously switch the code pattern in accordance with the code pattern switching time.

In this case, as shown in FIG. 4, the code pattern switching time is defined in the SWAP_ACTION_TIME field by adding a SWAP_ACTION_TIME field to the UHDM transmitted from the base station to the terminal. By doing so, it is possible to prevent unnecessary signal transmission at the base station by switching the code pattern without affecting the handoff time.

The SWAP_ACTION_TIME is composed of 6 bits so that 64 code pattern switching times can be defined, and the code pattern switching time defined in the SWAP_ACTION_TIME field is defined in units of 80 ms, which is a unit of system time. That is, for example, if the SWAP_ACTION_TIME field is 000001, the code pattern switching time is 80ms, if 000010, the code pattern switching time is 160ms, and if 000011, the code pattern switching time is defined as 240ms.

It is preferable to define whether or not to apply the code pattern switching time to the UHDM, and to determine whether or not to apply the code pattern switching time. The USE_SWAP_TIME field is added to the UHDM to define whether or not the code pattern switching time is applied to the USE_SWAP_TIME field. . For example, if the USE_SWAP_TIME field is 0, the code pattern switching time is not applied. If the USE_SWAP_TIME field is 1, the base station and the terminal simultaneously change the code pattern according to the code pattern switching time defined in the SWAP_ACTION_TIME field.

Here, the switching of the code pattern will be described in more detail with reference to FIGS. 1 and 5.

5 is a view for explaining the code pattern switching time of the base station and the terminal according to the present invention.

1 and 5, as described above, when the mobile communication terminal 105 is operated in the cell region of the base station A 101, the mobile terminal 105 receives a signal from the base station A 101 and receives a code pattern α. And receives a signal with the α code pattern.

At this time, the terminal 105 receives an Extended Supplemental Channel Assignment Message (ESCAM) message to determine which code pattern the terminal 105 and the base station will initially communicate with.

At this time, the terminal 105 receives a signal in the cell region of the base station A 101 with an alpha code pattern, and the terminal 105 receives a 2-way handoff area between the base station A 101 and the base station B 102. Approaching to 110a, the strength of the signal received from the base station B 102 increases, and the terminal 105 increases the strength of the pilot signal of the signal received from the base station B 102 above a specific value. If the strength of the pilot signal of the base station B (102) is greater than a certain value by measuring the transmission, and informs this by sending an Extended Pilot Strength Measurement Message (EPSMM) to each base station, the base station A (102) A code pattern β different from the code pattern assigned to 101 is assigned, and a UHDM is sent to the terminal 105 to indicate to which code pattern a signal is to be sent. Receive from the base station B 102 The signal is received in the β code pattern, and an EHCM (Extended Handoff Completion Message) indicating that the handoff is completed is transmitted to each base station.

In addition, when the terminal 105 approaches the base station C 103 in the 2-way handoff area 110a of the base station A 101 and the base station B 102, the terminal 105 receives the received information from the base station C 103. When the strength of the signal is increased, and the terminal 105 becomes larger than a specific value of the pilot signal strength of the signal received from the base station C 103, the base station A (101) to the base station C (103) ) Or a code pattern assigned to the base station B (102) is allocated to receive a signal from the base station C (103).

In this case, when the strength of the pilot signal of the base station C 103 becomes greater than a specific value, the terminal 105 transmits an EPSMM to each base station to inform the base station C 103 of the base station C 101 and the base station A 101 and the base station. Any one of the code patterns assigned to the B 102, for example, the α code pattern is assigned, and the terminal 105 sends a UHDM to indicate which code pattern to send a signal to, and thus the base station A 101. The base station C 103 receives a signal in α code pattern, the base station B 102 receives a signal in β code pattern, and transmits an EHCM indicating that the handoff is completed.

At this time, when the terminal 105 moves from the 3-way handoff area 120 to the 2-way handoff area 110c of the base station A 101 and the base station C 103, the base station B 102 is located. ), The terminal 105 receives a signal from the base station A (101) and the base station C (103), and the base station A (101) and the base station C (103) both use the α code pattern Therefore, since the gain of the CCPC handoff method cannot be obtained, the code pattern of any one base station is switched as described above.

That is, as the terminal 105 moves to the 2-way handoff area 110c of the base station A 101 and the base station C 103, the signal of the base station B 102 is weakened, When the pilot signal is less than the specified value, the EPSMM is transmitted to each base station, drop the signal of the base station B (102) according to the EPSMM, and set the base station A (101) and base station C (103) to the active state and the base station A And transmits the UHDM to receive the signal from the base station C (103) and the base station C (103), and the terminal 105 drops the signal of the base station B (102) according to the information of the UHDM, and performs a handoff. The completed EHCM is transmitted to each active base station to complete the actual handoff.

At this time, in the UHDM, the base station C 103 determines which code pattern is used by the base station C 103 in the PUNCTURE_PATTERN field, the information of the changed code pattern, and the base station C 103 uses the code pattern in the SWAP_ACTION_TIME field. Since the code pattern switching time information of when to switch is included, the terminal 105 and the base station C 103 simultaneously switch the code pattern in accordance with the code pattern switching time.

In this case, as described above, the code pattern switching time is defined in the SWAP_ACTION_TIME field by adding the SWAP_ACTION_TIME field to the UHDM, and the SWAP_ACTION_TIME is composed of 6 bits to define 64 code pattern switching times. The code pattern change time defined in the SWAP_ACTION_TIME field is defined in units of 80 ms, which is a unit of system time.

Whether to apply the SWAP_ACTION_TIME is defined in the USE_SWAP_TIME field of the UHDM. If the USE_SWAP_TIME field is 0, it is not applied.

Therefore, the handoff is completed by dropping the signal of the base station B 102 and transmitting the EHCM when the terminal receives the UHDM message, and the terminal 105 and the base station C 103 in accordance with the code pattern switching time are completed. At the same time, the code pattern is switched and the signal of the base station C 103 is transmitted to the terminal.

Thus, since the terminal 105 always receives signals of different code patterns from the base station, it is possible to obtain the gain of the CCPC handoff method in any handoff region.

As described above, the CCPC handoff method in the 3-way handoff area according to the present invention includes two of the 2-way handoff areas when moving from the 3-way handoff area to the 2-way handoff area. When the code patterns assigned to the base stations are the same, by changing the code pattern of one of the two base stations of the two-way handoff region to a code pattern different from the code pattern of the other base station, the multiple base stations There is an advantage in that the CCPC handoff method can be obtained by transmitting another signal and receiving and combining the other signal in the terminal.

Claims (36)

10. A method in which a base station comprising an encoder transmits a message for Code Combining and Packet Combining handoff. A data field indicating a switching time for converting an encoder type of the base station from a preset first type to a preset second type, and the switching time is a second preset value in the preset first type for the encoder type; Constructing a handoff message that includes a first indicator indicating whether or not to be used to switch to a type; And And transmitting the configured handoff message to a mobile terminal. The method of claim 1, And switching the encoder type of the base station to a preset second type at the switching time. The method of claim 1, And said encoder is a turbo encoder. The method of claim 3, The turbo encoder has a different output according to the encoder type, the handoff message transmission method for code combining and packet combining handoff. The method of claim 4, wherein And the output of the turbo encoder is determined by a puncturing pattern of the turbo encoder. The method of claim 1, The handoff message is a UHDM (Universal Handoff Direction Message) characterized in that the handoff message transmission method for code combining and packet combining handoff. The method of claim 1, The data field is composed of 6 bits and 64 transition times are defined, characterized in that the handoff message transmission method for code combining and packet combining handoff. The method of claim 1, The switch time is defined in units of 80 ms, which is a unit of system time. The method of claim 1, The first indicator is 0 when the data field is not used, and 1 when the data field is used, wherein the first indicator is a handoff message transmission method for code combining and packet combining handoff. The method of claim 1, The handoff message includes information indicating a base station to which the encoder type is switched, handoff message transmission method for code combining and packet combining handoff. The method of claim 10, And the information indicating the base station is included in a specific field indicating the base station. The method of claim 1, And wherein the handoff message includes information indicative of the switched encoder type. A code combining and packet combining handoff method of a mobile terminal communicating with a base station having an encoder, the method comprising: Pilot Strength Measurement Message (PSMM) when the strength of the pilot signal is greater than the first preset value or when the strength of the pilot signal is less than the second preset value according to a result of measuring the pilot signal received from the base station Transmitting; A data field indicating a switching time for converting an encoder type of the base station from a preset first type to a preset second type and a second type in which the data field sets the encoder type to a preset first type Receiving a handoff message comprising a first indicator indicating what is to be used to switch to; And Code Combining and Packet Combining handoff method comprising the step of transmitting a Handoff Completion Message (HCM). The method of claim 13, And receiving a signal from the base station according to the preset second type encoder type at the switching time. The method of claim 13, The code combining and packet combining handoff method, characterized in that the encoder is a turbo encoder. The method of claim 15, The turbo encoder has a different output according to the encoder type Code Combining and Packet Combining handoff method. The method of claim 16, The output of the turbo encoder is determined by the puncturing pattern of the turbo encoder (Code Combining and Packet Combining) handoff method. The method of claim 13, The Handoff message is a Code Combining and Packet Combining Handoff method characterized in that the Universal Handoff Direction Message (UHDM). The method of claim 13, The data field is composed of six bits, 64 switching time is defined, Code Combining and Packet Combining Handoff method characterized in that. The method of claim 13, The switch time is Code Combining and Packet Combining handoff method characterized in that the unit is defined in units of 80ms of system time. The method of claim 13, The first indicator is 0 when the data field is not used and 1 when the data field is used. The method of claim 13, The handoff message includes information indicating the base station to which the encoder type is switched. Code Combining and Packet Combining handoff method. The method of claim 22, The information indicating the base station is included in a specific field representing the base station. Code Combining and Packet Combining handoff method. The method of claim 13, And the handoff message includes information indicative of the switched encoder type. A handoff method of a communication system comprising a mobile terminal communicating with a base station having an encoder, Measuring, by the mobile terminal, a pilot signal received by the base station; Transmitting a pilot strength measurement message (PSMM) when the strength of the pilot signal is greater than a first predetermined value or when the strength of the pilot signal is less than a second predetermined value according to the measurement result; A data field indicating a switching time for converting an encoder type of the base station from a preset first type to a preset second type and the data field used to convert the encoder type from the first type to the second type Constructing and transmitting a handoff message to the mobile terminal, the handoff message comprising a first indicator indicating that the information is to be performed; And And a mobile station transmitting a HCM (Handoff Completion Message) to the base station. The method of claim 25, And switching the encoder type of the base station to a preset second type at the switching time, and receiving a signal from the base station according to the preset encoder type of the preset second type in the mobile terminal. Code Combining and Packet Combining handoff method. The method of claim 25, The code combining and packet combining handoff method, characterized in that the encoder is a turbo encoder. The method of claim 27, The turbo encoder has a different output according to the encoder type, the handoff message transmission method for code combining and packet combining handoff. The method of claim 28, The output of the turbo encoder is determined by the puncturing pattern of the turbo encoder (Code Combining and Packet Combining) handoff method. The method of claim 25, The Handoff message is a Code Combining and Packet Combining Handoff method characterized in that the Universal Handoff Direction Message (UHDM). The method of claim 25, The data field is composed of six bits, 64 switching time is defined, Code Combining and Packet Combining Handoff method characterized in that. The method of claim 25, The switch time is Code Combining and Packet Combining handoff method characterized in that the unit is defined in units of 80ms of system time. The method of claim 25, The first indicator is 0 when the data field is not used and 1 when the data field is used. The method of claim 25, The handoff message includes information indicating the base station to which the encoder type is switched. Code Combining and Packet Combining handoff method. The method of claim 34, wherein The information indicating the base station is included in a specific field representing the base station. Code Combining and Packet Combining handoff method. The method of claim 25, And the handoff message includes information indicative of the switched encoder type.

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