JP3318198B2 - Method for executing soft handover start / end processing, base station apparatus and mobile station apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to mobile communication using soft handover, for example, CDMA (Code Divisio).
The present invention relates to a method for executing a soft handover start / end process for improving a radio section capacity in an n Multiple Access (code division multiple access) system, and to a base station apparatus and a mobile station apparatus.

[0002]

2. Description of the Related Art At present, a digital mobile communication network is provided with a commercial service by a PDC (Personal Digital Cellular) system in Japan. In the PDC system, when a mobile station crosses a wireless zone set for each base station during communication, a handover function for sequentially switching communication lines to base stations corresponding to each wireless zone to continue communication. Is provided. The trigger for starting the handover in the PDC system, that is, the so-called hard handover, has been similarly determined and executed between the uplink from the mobile station to the base station and the downlink from the base station to the mobile station.

On the other hand, in the CDMA mobile communication system, soft handover is used as handover. This soft handover will be described with reference to FIGS. First, in FIG. 9A, it is assumed that the mobile station PS moves in the direction of arrow A while performing communication only with the base station BS1. In FIG. 9A, x indicates the uplink from the mobile station PS to the base station BS1, and X indicates the downlink from the base station BS1 to the mobile station PS. A soft handover is performed when switching communication from the base station BS1 currently communicating with the next base station BS2 in accordance with the movement of the mobile station PS.

That is, as shown in FIG. 9 (b), the mobile station PS communicates with the base station BS1 while simultaneously communicating with the base station B1.
The base station is temporarily switched while communicating with S2. In FIG. 9B, the uplink from the mobile station PS to the base station BS1 is y1, the uplink from the mobile station PS to the base station BS2 is y2, and the downlink from the base station BS1 to the mobile station PS is Y1. Thus, the downlink from the base station BS2 to the mobile station PS is indicated by Y2. Here, the uplink y2 is the uplink y
The same signal as 1 may be used. At this time, the mobile station PS combines the downlink Y1 and the downlink Y2, and the uplink y1 and the uplink y2 received by the base stations BS1 and BS2 respectively become the base stations BS1 and BS2.
And a combination distribution station MC connected by a wired line or the like.

Next, referring to FIG. 10, in FIG. 10, the reception level of the pilot channel (or perch channel) from the base station BS1 decreases with the movement of the mobile station PS, while the pilot channel from the base station BS2 decreases. It indicates that the reception level increases. Although FIG. 10 shows that each reception level changes linearly for the sake of simplicity, each reception level actually changes in a complicated manner according to the radio wave environment and the like.

In the CDMA mobile communication system, the reception level of the pilot channel from the base station BS1 and the base station B
A soft handover is started at a position where the difference between the reception level of the pilot channel from S2 and C1 is C1, and the difference between the reception level of the pilot channel from the base station BS2 and the reception level of the pilot channel from the base station BS1 is reduced. The soft handover ends at the position where C2 (where C1 = C2).

[0007] In the soft handover, the reception quality can be improved by synthesizing signals of a plurality of wireless lines having almost no correlation, and this quality improvement is allocated to reduction of transmission power. Thus, the system capacity can be increased.

Next, with reference to simulation results shown in FIGS. 11 and 12, the system capacity with respect to the reception level difference (corresponding to C1 or C2 shown in FIG. 10) of the soft handover start / end determination pilot channel will be described. 11 and 12, the spreading gain pg
= 64, and the transmission power control interval fDT = 0.001. The combining method is maximum ratio combining. Also, the wireless section capacity (C / Pg) on the vertical axis is, for example, 32 at 0.5.
(= 0.5 × 64) indicates that mobile stations can be connected simultaneously.

First, referring to FIG. 11, according to the simulation result of the uplink system capacity, the soft handover start / end determination pilot channel reception level difference is increased, that is, the system capacity is increased as the soft handover becomes easier. You can see it goes up. Specifically, in the case shown in FIG. 11, the uplink system capacity increases to 8 to 9 dB, and thereafter the increase amount decreases. This indicates that the capacity increases. Referring to FIG. 12, according to the simulation result of the downlink system capacity, the downlink system capacity increases to 4 dB, and thereafter, the increase decreases.
dB has been shown to be optimal.

[0010] The maximum ratio combining method requires a large amount of information for the combining process, so that the processing between stations, for example, between base stations requires a large amount of line occupancy. Although it is inappropriate, it can be said that it is preferable because it does not occupy a line in a station, for example, in the same mobile station.

[0011]

As described above, as described above,
In the downlink shown in FIG. 12, the optimum value is 4 dB, but in the uplink shown in FIG. 11, there is still room to about 7 to 8 dB. Therefore, when the handover start (end) trigger is the same for the uplink and the downlink as in the related art, the radio section capacity is degraded from the optimal value in one of the uplink and the downlink, and the radio section capacity is reduced. There was a problem that it would be wasted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a soft handover start / end processing execution method and a base station apparatus capable of optimizing a radio section capacity in both uplink and downlink. It is an object to provide a mobile station device.

[0013]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a base station which is currently communicating with the movement of a mobile station and a next base station are provided. A soft handover start / end processing execution method for temporarily switching communication by soft handover, wherein a soft handover is started and ended.
The start timing and end timing of the soft handover of the uplink communication line from the mobile station to the base station and the start timing and end timing of the soft handover of the downlink communication line from the base station to the mobile station are set independently. The point is to obtain.

According to the first aspect of the present invention, when a soft handover is started, a soft handover of the uplink communication line from the mobile station to the base station is started, and when the soft handover is completed, the mobile station starts the soft handover. Trigger of soft handover of uplink communication line to the station, trigger of soft handover of downlink communication line from base station to mobile station when starting soft handover, and base station to mobile station when ending soft handover Since the end of soft handover of the downlink communication line can be set independently of each other, the wireless section capacity can be optimized for the uplink line, the downlink line, and both lines.

According to a second aspect of the present invention, in the mobile station according to the first aspect, when the mobile station determines the start timing or the end timing of the soft handover of at least one of the uplink communication line and the downlink communication line, It is the gist of the present invention to report identification information for identifying the uplink communication line and the downlink communication line together with the determination information related to the determination.

According to the second aspect of the present invention, the mobile station makes a determination on the start or end of the soft handover, and together with this determination information, an identification for distinguishing the uplink communication line from the downlink communication line. Since the information is reported, the start or end of the soft handover can be executed quickly and accurately.

According to a third aspect of the present invention, there is provided the base station according to the first aspect, wherein the mobile station sequentially reports from the mobile station and the neighboring cell or sector in which the mobile station is located, and a peripheral cell or sector therearound. When the start or end of the soft handover is determined in one of the uplink communication line and the downlink communication line based on the measured value of the pilot channel reception level, the soft handover execution process in the determined communication line is independent. The gist is to do it.

According to the third aspect of the present invention, the base station determines the start or end of the soft handover based on the measured pilot channel reception level sequentially reported from the mobile station. Since the soft handover execution process is performed independently in the performed uplink or downlink communication line, the start or end of the soft handover can be executed quickly and accurately. Also, since the software and hardware burden on the mobile station can be reduced, the mobile station can be reduced in weight and size.

According to a fourth aspect of the present invention, when the start of the soft handover of the uplink communication line is determined, the handover source base station transmits the uplink radio communication to the combining / distributing station, the handover destination base station and the mobile station. Notifying that soft handover is not started only for the line and not starting soft handover for the downlink radio communication line, the mobile station transmits a new uplink radio communication line or a handover destination using the handover source uplink radio communication line. An uplink radio communication line is set for the base station, and the handover destination base station starts receiving and setting processing of the newly set uplink radio communication line without performing transmission and setting processing by a new downlink radio communication line. The combining and distributing station communicates with the new handover destination base station through a downlink wired communication circuit. Setting of the handover source base station and the handover destination base station by newly setting up the upstream wired communication line with the handover destination base station without performing the setting and the information transmission to the handover destination base station via the downlink wire communication line. From this point, the gist of the present invention is to start the process of synthesizing the signal transmitted through the upstream wired communication line.

According to the present invention, when the start of the soft handover of the uplink communication line is determined,
Lines are sequentially set in the handover source base station, the combining / distributing station, the handover destination base station, and the mobile station, and soft handover of the uplink communication line is smoothly started.

According to a fifth aspect of the present invention, when the start of the soft handover of the downlink communication line according to the second or third aspect is determined, the handover source base station communicates with the handover destination base station and the mobile station. Notifying that the soft handover is to be started only for the downlink radio communication line, and the handover destination base station performs the reception and the setting process of the new uplink radio communication line without using the newly set downlink radio communication line. Performing transmission and setting processing, the mobile station performs reception and setting processing of the downlink radio communication line from the handover destination base station without performing the setting processing of the uplink radio communication line for the new handover destination base station, Combination of signals transmitted from the handover source base station and the handover destination base station via downlink radio communication lines Starting the handover, the handover destination base station or the handover source base station notifies the combining and distributing station that soft handover is to be started only for the downlink radio line, and the combining and distributing station communicates with the new handover destination base station. Between the handover destination base station and the downstream wired communication line without performing the processing of setting up the upstream wired communication line and synthesizing the signals transmitted from the handover source base station and the handover destination base station via the upstream wired communication line. The gist is to make settings and start transmission of the same information as that transmitted to the handover source base station to the handover destination base station.

According to the fifth aspect of the present invention, when the start of the soft handover of the downlink communication line is determined,
Lines are sequentially set in the handover source base station, the combining / distributing station, the handover destination base station, and the mobile station, and the soft handover of the downlink communication line is smoothly started.

According to a sixth aspect of the present invention, in the determination of the second or third aspect, a pilot channel reception level of a peripheral cell or a sector around the mobile station is compared with a reference level, and When there is a pilot channel of a neighboring cell or sector that satisfies (reception level)> (reference level A ₁ ), the point is to start soft handover to the cell or sector transmitting the pilot channel.

According to the sixth aspect of the present invention, the pilot channel reception level is compared with the reference level when determining the start timing of the soft handover of at least one of the uplink communication line and the downlink communication line. As a result, the optimum judgment can be made quickly.

According to a seventh aspect of the present invention, in the determination of the second or third aspect, the pilot channel reception level of the serving cell or sector in which the mobile station is located and the peripheral cells or sectors around the serving cell or sector is determined. Based on (reception level of pilot channel of serving cell / sector) − (reception level of pilot channel of neighboring cell / sector) <
When there is a pilot channel of a neighboring cell or sector that satisfies the (reference level difference B ₁ ), the point is to start soft handover to the cell or sector transmitting the pilot channel.

According to the present invention, when determining the start timing of the soft handover of at least one of the upstream communication line and the downstream communication line,
Since the difference between the pilot channel reception level of the sector and the pilot channel reception level of the neighboring cell / sector is compared with the reference level difference, the optimum decision can be made quickly.

[0027] In the invention according to claim 8, when the end of the soft handover of the uplink communication line according to claim 2 or 3 is determined, the base station sends the uplink to the combined distribution station and the mobile station. Notifying that the soft handover of the wireless communication line is to be terminated and a line to be released among a plurality of uplink wireless communication lines performing the soft handover,
The mobile station stops and releases the transmission of the notified uplink wireless communication line, while continuously receiving the downlink wireless communication line corresponding to the released uplink wireless communication line, and the base station transmits the uplink wireless communication line. While stopping and releasing the reception, the transmission of the downlink radio communication line corresponding to the released uplink radio communication line is continued, and the combining and distributing station stops combining the notified uplink wired communication line, and The gist of the present invention is to release the wired communication line and maintain the distribution to the downlink wireless communication line corresponding to the released uplink wired communication line.

According to the present invention, when it is determined that the soft handover of the uplink communication line is to be terminated,
In the base station, the combining and distributing station, and the mobile station, stop of reception and release of the line are sequentially set, and the soft handover of the uplink communication line is smoothly completed.

According to a ninth aspect of the present invention, when the end of the soft handover of the downlink communication line according to the second or third aspect is determined, the base station sends the downlink to the combined distribution station and the mobile station. Notifying that the soft handover of the wireless communication line is to be terminated and a line to be released among a plurality of downlink wireless communication lines performing the soft handover,
The mobile station stops receiving and releases the notified downlink radio communication line, and maintains the transmission of the uplink radio communication line corresponding to the released downlink radio communication line.
While stopping and releasing the transmission of the downlink wireless communication line, the reception of the uplink wireless communication line corresponding to the released downlink wireless communication line is continued, and the combining / distributing station stops distribution for the notified downlink wired communication line. The gist of the present invention is to release the downlink wired communication line and to continue the synthesis of the uplink wireless communication line corresponding to the released downlink wired communication line.

According to the ninth aspect of the present invention, when the end of the soft handover of the downlink communication line is determined,
The base station, the combining and distributing station, and the mobile station sequentially stop reception and release the line, and smoothly complete the soft handover of the downlink communication line.

More specifically, the mobile station has storage means for storing two types of handover start determination parameters, one for uplink and one for downlink, and further includes a perch channel reception level difference and a start determination for each uplink / downlink. It has a comparison means for comparing with a condition. The mobile station makes a determination for each uplink / downlink, and if either determination criterion is satisfied, transmits a handover start notification signal to the base station with an uplink / downlink identifier added thereto. The base station follows the identification of uplink / downlink,
A handover process is performed for each downlink.

Further, in the invention according to claim 10, in the determination according to claim 2 or 3, a pilot channel reception level of a peripheral cell or a sector around the mobile station is compared with a reference level, and soft handover is performed. If there is a pilot channel in the cell or sector in which the pilot channel satisfies (pilot channel reception level) <(reference level A ₂ ), the soft handover with the cell or sector transmitting the pilot channel ends. That is the gist.

According to the tenth aspect of the present invention, the pilot channel reception level is compared with the reference level when determining the end of the soft handover of at least one of the uplink communication line and the downlink communication line. As a result, the optimum judgment can be made quickly.

According to the present invention, in the determination of the second or third aspect, the pilot channel reception level of the serving cell or sector in which the mobile station is located and the surrounding cells or sectors around the serving cell or sector is determined. Based on the pilot channel of the cell or sector that is performing soft handover, (reception level of pilot channel of serving cell / sector) − (reception level of pilot channel of neighboring cell / sector)> (reference level difference B ₂ ) When there is a satisfactory pilot channel, the point is to end soft handover with the cell or sector transmitting the pilot channel.

According to the eleventh aspect of the present invention, when judging the end of the soft handover of at least one of the uplink communication line and the downlink communication line, the reception level of the pilot channel of the serving cell / sector and the neighboring cells are determined. /
Since the difference between the pilot channel reception level of the sector and the reference level difference is compared, the optimum decision can be made quickly.

The invention according to claim 12 is a base station apparatus for performing a soft handover to switch communication from a base station currently performing communication to a next base station in accordance with movement of a mobile station, Extraction means for receiving a signal from a mobile station and extracting a reception level measurement value measured by the mobile station, and a communication from the mobile station to the base station based on the reception level measurement value obtained by the extraction means. Ascending start timing judging means for judging the start timing of soft handover, and descent start timing judging for judging the start timing of soft handover of communication from the base station to the mobile station based on the reception level measurement value obtained by the extracting means. Means for starting soft handover of communication from the mobile station to the base station based on the soft handover start timing determined by the uplink start timing determining means and the downlink start timing determining means. When, and summarized in that a control means for independently setting controls the starting trigger of soft handover from the base station to the mobile station.

According to the twelfth aspect of the present invention, the base station obtains a measured value of the reception level measured by the mobile station, and performs uplink communication from the mobile station to the base station based on the measured value of the reception level. The start timing of the soft handover of the line and the start timing of the soft handover of the downlink communication line from the base station to the mobile station can be determined, and the start timing of the soft handover of the uplink / downlink communication line can be set independently. it can.

According to a thirteenth aspect of the present invention, the up start timing determining means and the down start timing determining means according to the twelfth aspect respectively include a storage means for storing a reference value for determining a start timing, The gist of the present invention is to have a comparing means for comparing the value with the measured reception level.

According to the thirteenth aspect of the present invention, there is provided a storage means for storing a reference value relating to a start trigger using one or a plurality of memories of a base station, and a comparison means for comparing the reference value with the reference value. And

According to a fourteenth aspect of the present invention, the comparing means according to the thirteenth aspect compares the pilot channel reception level of a peripheral cell or a sector around the mobile station with a reference level, and determines whether or not the pilot channel reception level is higher. Level)>
When there is a pilot channel of a neighboring cell or sector that satisfies (the reference level A ₁ ), the gist is to start a soft handover to the cell or sector transmitting the pilot channel.

According to the fourteenth aspect of the present invention, when determining the start timing of the soft handover of at least one of the uplink communication line and the downlink communication line, the base station compares the pilot channel reception level and the reference level with each other. Since the comparison is made, it is possible to quickly perform the optimum determination without imposing a burden on the mobile station.

According to a fifteenth aspect of the present invention, the comparing means according to the thirteenth aspect is characterized in that the comparing means based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and peripheral cells or sectors around the serving cell or sector. , (Cell in service /
When there is a pilot channel of a peripheral cell or a sector that satisfies (a pilot channel reception level of a sector) − (a pilot channel reception level of a peripheral cell / sector) <(reference level difference B ₁ ), a cell transmitting the pilot channel or The point is to start a soft handover to a sector.

According to the fifteenth aspect of the present invention, when determining the start timing of the soft handover of at least one of the uplink communication line and the downlink communication line, the base station determines the pilot channel reception level of the serving cell / sector. And the difference between the pilot channel reception level of the peripheral cell / sector and the reference level difference,
Optimal determination can be quickly performed without imposing a burden on the mobile station.

Further, the invention according to claim 16 is a base station apparatus for performing a soft handover to switch communication from a base station which is currently performing communication to a next base station with movement of a mobile station, Extraction means for receiving a signal from a mobile station and extracting a reception level measurement value measured by the mobile station, and a communication from the mobile station to the base station based on the reception level measurement value obtained by the extraction means. Ascending end timing determining means for determining the end timing of the soft handover, and descending end timing determining means for determining the end timing of the soft handover from the base station to the mobile station based on the reception level measurement value obtained by the extracting means. A soft handover termination timing of communication from the mobile station to the base station based on the soft handover termination timing determined by the uplink termination timing determination unit and the downlink termination timing determination unit, And summarized in that a control means for setting respective controls and End trigger of soft handover to the mobile station from the earth station.

According to the present invention, the base station obtains the measured value of the reception level measured by the mobile station, and performs uplink communication from the mobile station to the base station based on the measured value of the reception level. It is possible to determine the end of the soft handover of the line and the end of the soft handover of the downlink communication line from the base station to the mobile station, and independently set the end of the soft handover of the uplink / downlink communication line. it can.

According to a seventeenth aspect of the present invention, there is provided a storage device for storing a reference value for judging an end opportunity, wherein the up end opportunity determination means and the down end opportunity determination means according to the sixteenth aspect respectively comprise: The gist of the present invention is to have a comparing means for comparing the value with the measured reception level.

According to the seventeenth aspect of the present invention, a storage means for storing a reference value relating to an end trigger using one or a plurality of memories of the base station, and a comparison means for comparing with the reference value And

[0048] Further, the invention according to claim 18 is characterized in that the storage means according to claim 13 or 17 stores reference levels that are set independently for uplink communication lines and downlink communication lines. I do.

According to the eighteenth aspect of the present invention, since the storage means stores the reference levels independently set for the uplink communication line and the downlink communication line, the storage means performs the soft handover of the uplink communication line. The start timing, the end of the soft handover of the uplink communication line, the start of the soft handover of the downlink communication line, and the end of the soft handover of the downlink communication line can be easily and independently set.

According to a nineteenth aspect of the present invention, the comparing means according to the seventeenth aspect performs a soft handover by comparing a pilot channel reception level of a peripheral cell or a sector around the mobile station with a reference level. When there is a pilot channel of a cell or sector that satisfies (pilot channel reception level) <(reference level A ₂ ), soft handover with the cell or sector transmitting the pilot channel is terminated. Is the gist.

According to the nineteenth aspect of the present invention, when the base station determines the end of the soft handover of at least one of the uplink communication line and the downlink communication line, the base station determines the pilot channel reception level and the reference level. Since the comparison is made, it is possible to quickly perform the optimum determination without imposing a burden on the mobile station.

According to a twentieth aspect of the present invention, the comparing means according to the seventeenth aspect is characterized in that the comparing means based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and peripheral cells or sectors around the serving cell or sector. Then, the pilot channel of the cell or sector that is performing soft handover satisfies (reception level of pilot channel of serving cell / sector) − (reception level of pilot channel of neighboring cell / sector)> (reference level difference B ₂ ). When there is a pilot channel to perform, the gist is to end soft handover with the cell or sector transmitting the pilot channel.

According to the twentieth aspect of the present invention, the base station receives the pilot channel of the serving cell / sector when judging the end of the soft handover of at least one of the uplink communication line and the downlink communication line. Since the difference between the level and the reception level of the pilot channel of the neighboring cell / sector is compared with the reference level difference, the optimum decision can be quickly made without imposing a burden on the mobile station.

According to a twenty-first aspect of the present invention, there is provided a mobile station apparatus for performing a soft handover to switch communication from a base station currently performing communication to a next base station in accordance with movement of a mobile station. Measuring means for measuring the reception level based on the signal from the base station to be output, and outputting the measured value; and from the mobile station to the base station based on the reception level measurement value measured by the measuring means. An uplink start timing determining means for determining a soft handover start timing of the communication, and a downlink start timing for determining a soft handover start timing from the base station to the mobile station based on the reception level measurement value measured by the measuring means. Determining means for opening the soft handover of the communication from the mobile station to the base station based on the soft handover start timing determined by the uplink start timing determining means and the downlink start timing determining means. And summarized in that has a trigger, and a control means for setting respective controls the start trigger of soft handover from the base station to the mobile station.

According to the twenty-first aspect of the present invention, the mobile station obtains a measured value of the reception level measured by the mobile station and performs uplink communication from the mobile station to the base station based on the measured value of the received level. The start timing of the soft handover of the line and the start timing of the soft handover of the downlink communication line from the base station to the mobile station can be determined, and the start timing of the soft handover of the uplink / downlink communication line can be set independently. it can.

According to a twenty-second aspect of the present invention, there is provided an up-start trigger determining means and a down-start trigger determination means according to the twenty-first aspect, wherein each of the storage means stores a reference value for determining a start trigger. The gist of the present invention is to have a comparing means for comparing the value with the measured reception level.

According to the present invention as set forth in claim 22, storage means for storing a reference value relating to a start trigger using one or a plurality of memories of the mobile station, and comparison means for comparing with the reference value And

According to a twenty-third aspect of the present invention, the comparing means according to the twenty-second aspect compares the pilot channel reception level of a peripheral cell or sector around the mobile station with a reference level, and sets Level)>
When there is a pilot channel of a neighboring cell or sector that satisfies (the reference level A ₁ ), the gist is to start a soft handover to the cell or sector transmitting the pilot channel.

According to the twenty-third aspect of the present invention, at the time of determining the start of the soft handover of at least one of the uplink communication line and the downlink communication line, the mobile station determines the pilot channel reception level and the reference level. Since the comparison is made, the optimum judgment can be made quickly.

According to a twenty-fourth aspect of the present invention, the comparing means according to the twenty-second aspect is arranged such that the comparing means detects a pilot channel reception level of a serving cell or sector in which the mobile station is located and peripheral cells or sectors around the serving cell or sector. , (Cell in service /
When there is a pilot channel of a peripheral cell or a sector that satisfies (a pilot channel reception level of a sector) − (a pilot channel reception level of a peripheral cell / sector) <(reference level difference B ₁ ), a cell transmitting the pilot channel or The point is to start a soft handover to a sector.

In the present invention according to claim 24, when determining the start timing of the soft handover of at least one of the uplink communication line and the downlink communication line, the mobile station determines the pilot channel reception level of the serving cell / sector. And the difference between the pilot channel reception level of the peripheral cell / sector and the reference level difference,
Optimal determination can be made quickly.

According to a twenty-fifth aspect of the present invention, there is provided a mobile station apparatus for performing a soft handover to switch communication from a base station which is currently performing communication to a next base station in accordance with movement of a mobile station. Measuring means for measuring the reception level based on the signal from the base station to be output, and outputting the measured value; and from the mobile station to the base station based on the reception level measurement value measured by the measuring means. An uplink end timing determining means for determining a soft handover end timing of the communication, and a downlink end timing for determining a soft handover end timing from the base station to the mobile station based on the reception level measurement value measured by the measuring means. Determining means for ending the soft handover of the communication from the mobile station to the base station based on the soft handover termination timing determined by the uplink termination timing determining means and the downlink termination timing determining means. And summarized in that has a trigger, and a control means for setting respective controls and End trigger of soft handover from the base station to the mobile station.

According to the twenty-fifth aspect of the present invention, the mobile station obtains a measured value of the reception level measured by the mobile station, and performs uplink communication from the mobile station to the base station based on the measured value of the received level. It is possible to determine the end of the soft handover of the line and the end of the soft handover of the downlink communication line from the base station to the mobile station, and independently set the end of the soft handover of the uplink / downlink communication line. it can.

According to a twenty-sixth aspect of the present invention, the up-end trigger and the down-end trigger determiner each store a reference value for determining an end trigger, The gist of the present invention is to have a comparing means for comparing the value with the measured reception level.

According to the twenty-sixth aspect of the present invention, a storage means for storing a reference value relating to an end trigger using one or a plurality of memories of a mobile station, and a comparing means for comparing the reference value with the reference value And

The invention according to a twenty-seventh aspect is characterized in that the storage means according to the twenty-second or twenty-sixth aspect stores reference levels that are set independently for an uplink communication line and a downlink communication line. I do.

According to the twenty-seventh aspect of the present invention, since the storage means stores the reference levels which are set independently for the uplink communication line and the downlink communication line, the storage means performs the soft handover of the uplink communication line. The start timing, the end of the soft handover of the uplink communication line, the start of the soft handover of the downlink communication line, and the end of the soft handover of the downlink communication line can be easily and independently set.

According to a twenty-eighth aspect of the present invention, the comparing means of the twenty-sixth aspect performs a soft handover by comparing a pilot channel reception level of a peripheral cell or a sector around the mobile station with a reference level. When there is a pilot channel of a cell or sector that satisfies (pilot channel reception level) <(reference level A ₂ ), soft handover with the cell or sector transmitting the pilot channel is terminated. Is the gist.

According to the twenty-eighth aspect of the present invention, when the mobile station determines the end of the soft handover of at least one of the uplink communication line and the downlink communication line, the mobile station determines the pilot channel reception level and the reference level. Since the comparison is made, the optimum judgment can be made quickly.

Further, in the invention according to claim 29, the comparing means according to claim 26 is characterized in that the comparing means based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and peripheral cells or sectors around the serving cell or sector. Then, the pilot channel of the cell or sector that is performing soft handover satisfies (reception level of pilot channel of serving cell / sector) − (reception level of pilot channel of neighboring cell / sector)> (reference level difference B ₂ ). When there is a pilot channel to perform, the gist is to end soft handover with the cell or sector transmitting the pilot channel.

According to the twenty-ninth aspect of the present invention, when the mobile station determines the end of the soft handover of at least one of the uplink communication line and the downlink communication line, the mobile station receives the pilot channel of the serving cell / sector. Since the difference between the level and the reception level of the pilot channel of the neighboring cell / sector is compared with the reference level difference, the optimum decision can be quickly made without imposing a burden on the mobile station.

[0072]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 shows a CDMA to which the method for executing a soft handover start / end process according to the present invention is applied.
FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a mobile station device in a mobile communication system of a system.

The mobile station apparatus shown in FIG. 1 has an antenna 1 capable of receiving downlink radio communication lines from a plurality of base stations.
The signal from a plurality or a single base station received by the antenna 10 is separated by the transmission / reception separation unit 11 and supplied to the communication channel demodulation unit 15 via the communication channel reception unit 13. . This communication channel demodulation unit 1
Reference numeral 5 denotes a plurality of, here two communication channel demodulators 15a and 15b for simultaneously receiving downlink radio communication lines from a plurality of base stations during soft handover.
Are connected in parallel. After despreading using a spreading code and normal demodulation are performed for each channel in the communication channel demodulation unit 15, the demodulated signals of the respective channels are combined by the combining unit 16, and the communication channel is decoded. The signal is supplied to the section 17 and the transmission signal and the control signal are decoded. The decoded control signal is supplied to the control unit 27, and the transmission signal is supplied to a man-machine interface.

The transmission signal such as voice supplied from the man-machine interface is subjected to the addition of an error detection bit by an error detection bit adding circuit or the like, and then the coding section 2
9. The encoding unit 29 encodes the transmission signal from the man-machine interface and the control signal from the control unit 27, and supplies them to the modulation unit 31. The modulation unit 31 performs primary modulation on the transmission signal encoded by the encoding unit 29, further performs spread modulation with a spreading code, and transmits the modulated transmission signal from the antenna 10 via the transmission unit 33 and the transmission / reception separation unit 11. Send.

On the other hand, a part of the received signal received by antenna 10 and separated by transmission / reception separation section 11 is supplied to pilot channel reception level measurement section 21 via pilot channel reception section 19 and received by the pilot channel. The level is measured. The measured reception level of the pilot channel is used as a measurement value as the uplink soft handover start / end determination unit 23 and the downlink soft handover start / end.
These are supplied to the end determination unit 25, respectively.

Uplink soft handover start / end determination unit 23 and downlink soft handover start / end determination unit 25
Are the comparison units 231 (25
1) and a comparison parameter memory 233 (253), whereby the reference level is stored in the comparison parameter memory 23.
The reference level stored in the comparison parameter memory 233 and read from the comparison parameter memory 233 is compared with the pilot channel reception level in the comparison section 231.

Hereinafter, a comparison method in the comparison section 231 will be described. First, a first comparison method for comparing a pilot channel reception level of a peripheral cell or a sector with a reference level will be described. Here, the comparison parameter memory 233, the stored reference level A ₂ of the reference level A ₁ and the end trigger according to the start trigger, and the reference level A ₂ of the reference level A ₁ and the end trigger according to these start trigger is It is assumed that the uplink wireless communication line and the downlink wireless communication line are set independently of each other. That is, the reference level A related to the start timing of the uplink wireless communication line
_1U and a reference level A _2U relating to an end trigger, and a reference level A _1D relating to a start trigger of a downlink radio communication line and a reference level A _2D relating to an end trigger are stored, respectively.

Then, the pilot channel reception level measured by the pilot channel reception level measurement section 21 is compared with the reference level A ₁ read from the comparison parameter memory 233 relating to the start timing. )> If there is a pilot channel of a neighboring cell or sector that satisfies (reference level A ₁ ), control the determination result related to the soft handover start trigger for starting soft handover to the cell or sector transmitting the pilot channel. Part 2
7 is output.

Further, the reception level of the pilot channel of the cell or sector in which the soft handover is being performed is compared with the reference level A ₂ read from the comparison parameter memory 233 relating to the end timing. If there is a pilot channel that satisfies <(reference level A ₂ ), the control unit 27 outputs a determination result regarding a soft handover end trigger for ending a soft handover with a cell or sector transmitting the pilot channel to the control unit 27. .

Next, the difference between the pilot channel reception level of the serving cell or sector in which the mobile station is located and the pilot channel reception levels of peripheral cells or sectors around the serving cell is compared with a reference level. The comparison method 2 will be described.

Here, the comparison parameter memory 233 stores
Reference level difference B ₂ in accordance with the reference level difference B ₁ and ends triggered according to the start trigger is stored, and the reference level difference B ₂ in accordance with the reference level difference B ₁ and ends triggered according to these start trigger is an uplink wireless communication channel It is assumed that they are set independently for the downlink wireless communication line. That is, the reference level difference B _1U relating to the start timing of the uplink radio communication line and the reference level difference B _2U relating to the termination timing, and the reference level difference B _1D relating to the start timing of the downlink radio communication channel and the reference level difference relating to the termination timing B _2D are respectively stored.

Then, the difference between the pilot channel reception level of the serving cell / sector and the pilot channel reception level of the neighboring cell / sector measured by pilot channel reception level measuring section 21 and comparison parameter memory 23
3 is compared with the reference level difference B1 relating to the start timing read out from _{No. 3} and (the pilot channel reception level of the serving cell / sector)
-If there is a pilot channel of a peripheral cell or sector that satisfies (reception level of pilot channel of peripheral cell / sector) <(reference level difference B ₁ ), start soft handover to a cell or sector transmitting the pilot channel. To determine whether the soft handover has been started
7 is output.

Further, the difference between the pilot channel reception level of the cell or sector performing the soft handover and the reception level of the pilot channel of the neighboring cell / sector, and the reference level relating to the end trigger read from the comparison parameter memory 233 It compares the difference B _2, (pilot channel received level of the serving cell / sector)
If there is a pilot channel that satisfies (pilot channel reception level of peripheral cell / sector)> (reference level difference B ₂ ), soft handover for ending soft handover with the cell / sector transmitting the pilot channel The control unit 27 outputs the result of the determination relating to the end trigger to the control unit 27.

Next, the control unit 2 to which the above determination result is supplied
7 will be described. When the control unit 27 determines the start / end of the soft handover in either the uplink or the downlink based on the supplied determination result, the information indicating that the start or the end of the soft handover has been determined, Identification information for identifying the uplink and the downlink is transmitted as a soft handover start / end notification signal from the antenna 10 via the encoding unit 29, the modulation unit 31, the transmission unit 33, and the transmission / reception separation unit 11. At the base station,
After receiving the soft handover start / end notification signal,
A soft handover start / end process described later is executed.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing a schematic configuration of an embodiment of a base station apparatus when a soft handover start / end processing execution method of the present invention is applied and a soft handover start / end processing is executed on a base station side. It is.

The base station apparatus shown in FIG. 3 has an antenna 40 for receiving a radio communication line from a mobile station.
Communication channel demodulation unit 4 through communication channel reception unit 43
5 where despreading using a spreading code and normal demodulation are performed. Further, the demodulated signal is supplied to the communication channel decoding unit 47, and after the transmission signal and the control signal are decoded, the control signal and the transmission signal are supplied to the control unit 53 and the combining / distributing station.

The transmission signal, out of the control signal and the transmission signal from the combining / distributing station via the wired transmission path, is encoded by the encoding unit 5.
5 and the control signal is supplied to the control unit 53. The encoding section 55 encodes the transmission signal from the combining and distributing station and the control signal from the control section 53 and supplies the transmission signal to the modulation section 57. The modulation unit 57 performs primary modulation on the encoded transmission signal from the encoding unit 55, and further performs spread modulation with a spreading code,
The modulated transmission signal is transmitted to the transmission section 59 and the transmission / reception separation section 41.
Transmitted from the antenna 40 via.

Also, of the signals decoded by communication channel decoding section 47, pilot channel reception level measured by pilot channel reception level measurement section 21 of the mobile station apparatus described later and reported as a pilot channel reception level notification signal The measurement value information related to this is supplied to the uplink soft handover start / end determination unit 49 and the downlink soft handover start / end determination unit 51 via the control unit 53, respectively.

Up / down soft handover start / end determining section 49 and down soft handover start / end determining section 51
Includes a comparison unit and a comparison parameter memory as in the case of the mobile station device. The reference levels stored in the comparison parameter memory and read out (the reference level A ₁ according to the start trigger, the reference level A _{1 according to} the end trigger). A ₂ , the reference level difference B ₁ according to the start trigger and the reference level difference B ₂ according to the end trigger) and the reception level of the pilot channel measured and reported by the mobile station apparatus are compared with the first and the second in the comparison unit. The start / end of the soft handover is determined by appropriately using the second comparison method, and the respective determination results are supplied to the control unit 53. The control unit 53 executes a soft handover start / end process described later according to the determination result.

Next, the configuration and operation of a mobile station apparatus corresponding to the base station apparatus shown in FIG. 4 will be described.
The mobile station apparatus shown in FIG. 4 has the same configuration as that of the mobile station apparatus shown in FIG. 1 in a portion for generating a transmission signal, and a detailed description thereof will be omitted in the following description.

First, there is provided an antenna 10 capable of receiving downlink radio communication lines from a plurality of base stations, respectively. Signals from the plurality of base stations received by this antenna 10 are transmitted and received by a transmission / reception separating unit 11 to transmit and receive signals. And are separated. A part of the signals separated by the transmission / reception separation unit 11 is partially a communication channel receiving unit 13 and a communication channel demodulating unit 15 (1
5a, 15b), combining section 16, communication channel decoding section 1
7, demodulation, synthesis, decoding, and the like of the transmission signal and the control signal are performed and supplied to the man-machine interface. Transmission signals such as voice and various information from the man-machine interface are transmitted from the antenna 10 via the encoding unit 29, the modulation unit 31, the transmission unit 33, and the transmission / reception separation unit 11.

A part of the received signal separated by the transmission / reception separation unit 11 is supplied to a pilot channel reception level measurement unit 21 via a pilot channel reception unit 19, and the reception level of the pilot channel is measured. The measured reception level of the pilot channel is supplied to the control unit 27 as a measured value.

The control section 27 sequentially uses the supplied measured value as a pilot channel reception level notification signal together with other control signals from the antenna 10 via the encoding section 29, the modulation section 31, the transmission section 33 and the transmission / reception separation section 11. ,Send.

The measured values transmitted and received by the base station in this way are determined by the uplink soft handover start / end determination section 49 and the downlink soft handover start / end determination section 51 of the base station apparatus shown in FIG. The start / end of the uplink soft handover and the start / end of the downlink soft handover are determined.

After the base station receives the soft handover start / end notification signal from the mobile station, or after the control unit 53 supplies the judgment results from the soft handover start / end judgment units 49 and 51 to the base station, The procedure for starting / ending soft handover will be described with reference to FIGS. First, a processing procedure when the start of uplink handover is determined will be described with reference to a control sequence shown in FIG. In the handover source base station BS1, a soft handover start / end notification signal from the mobile station PS or a soft handover start / end determination unit 4
The start of uplink soft handover is determined based on the determination results from steps 9 and 51 (S1).

Then, the handover source base station BS1 transmits a soft handover start notification signal to the handover destination base station BS2 (S2). This soft handover start notification signal includes identification information indicating an uplink soft handover.

Upon receiving the soft handover start notification signal, the handover destination base station BS2 transmits to the combining / distributing station MC.
Transmits a combining start notification signal (S3), and requests to start combining with the uplink wired line from the handover source base station BS1 and the uplink wired line from the handover destination base station BS2.

In the combining and distributing station MC, an uplink wired line is set with the handover destination base station BS2 (S4).
The combining of the upstream wired lines of both stations with the handover source base station BS1 for which the uplink wired line has already been set is started (S5), and a combining start confirmation signal is transmitted to the handover destination base station BS2 (S6). ).

The handover destination base station BS2 starts receiving the uplink radio channel in response to the reception of the combining start confirmation signal from the combining and distributing station MC (S7), and stands by for transmission from the mobile station PS. Subsequently, the handover destination base station BS2 transmits a soft handover start confirmation signal to the handover source base station BS1 to notify that the own station is in the receiving state of the uplink radio channel, and the mobile station PS The information about the uplink radio line to be transmitted is notified (S8).

The handover source base station BS1 is connected to the mobile station P
A handover destination wireless channel designation signal is transmitted to S (S9). This signal includes identification information indicating an uplink soft handover, and a handover destination base station BS.
2 includes information on the uplink radio channel.

The mobile station PS is a handover destination base station BS.
The transmission of the uplink radio channel to the handover destination base station BS2 is started in accordance with the information on the uplink radio channel from No. 2 (S10). Here, when the transmission signal for the handover source base station BS1 is also used as the handover destination radio line, there is no need to transmit a new transmission signal. Thereafter, an uplink radio channel is set between the handover destination base station BS2 and the mobile station PS (S11), and after this channel setting, communication is performed between the handover destination base station BS2 and the mobile station PS via the uplink radio channel. And the information is transmitted on the upstream wired line, and the combining and distributing station MC combines the upstream signals from both stations.

Next, a processing procedure when it is determined that the start of a downlink handover will be described with reference to a control sequence shown in FIG. In the handover source base station BS1, a soft handover start / end notification signal from the mobile station PS or a soft handover start / end determination unit 4
The start of the downlink soft handover is determined based on the determination results from steps 9 and 51 (S21). Thereafter, the handover source base station BS1 transmits a soft handover start notification signal to the handover destination base station BS2 (S2).
2). This soft handover start notification signal includes identification information indicating that it is a downlink soft handover.

The handover destination base station BS2 transmits a distribution start notification signal to the combining distribution station MC (S23), and sends the distribution start notification signal to the handover destination base station BS2 in addition to the handover source base station BS1 for which the downlink cable line has already been set. Requests that distribution to the downstream wired line be started.

In the combining / distributing station MC, a downlink wired line is set with the handover destination base station BS2 (S2).
4) The distribution process to the down line is started to the handover source base station BS1 and the handover destination base station BS2 (S25), and a distribution start confirmation signal is transmitted to the handover destination base station BS2 (S26).

The handover destination base station BS2 starts transmitting the downlink radio line to the mobile station PS (S2).
7) A soft handover start confirmation signal is transmitted to the handover source base station BS1, and the information about the downlink radio channel transmitted from the handover destination base station BS2 is notified (S28).

The handover source base station BS1 is connected to the mobile station P
A handover destination wireless channel designation signal is transmitted to S (S29). This signal contains identification information indicating that the handover is a downlink soft handover, and information regarding a downlink radio channel from the handover destination base station BS2.

The mobile station PS is a handover destination base station BS.
According to the information on the downlink radio channel from the base station 2, the reception of the downlink radio channel from the handover destination base station BS2 is started (S30). Thereafter, a downlink radio channel is set between the handover destination base station BS2 and the mobile station PS (S31), and after the setting of the downlink radio channel, the handover destination base station BS2 is set.
And the mobile station PS, perform communication on the downlink radio line, and perform information transmission on the downlink wire line.
In, the downlink signal is distributed to both stations.

Next, a processing procedure in the case where the termination of the uplink handover is determined will be described with reference to a control sequence shown in FIG. In the base station BS, the end of the uplink soft handover is determined based on the soft handover start / end notification signal from the mobile station PS or the determination result from the soft handover start / end determination units 49 and 51 (S41). Thereafter, the base station BS transmits a soft handover end notification signal to the mobile station PS (S4).
2). This signal includes an identifier indicating that the line for ending the soft handover is an uplink, and information for specifying any of a plurality of radio lines for which the uplink to be released is performing the soft handover. Have been.

The mobile station PS transmits a soft handover end confirmation signal to the base station BS (S43),
After the transmission of the designated uplink is stopped, the setting of the uplink radio channel is released (S44).

After stopping the reception of the uplink radio channel, the base station BS releases the setting of the uplink radio channel (S4).
5) Further, a combining completion notification signal is transmitted to the combining distribution station MC (S46). The synthesis completion notification signal includes information for specifying which of the plurality of wired lines performing synthesis is to stop synthesis.

After the combining process is stopped for the designated upstream wired line, the combining / distributing station MC releases the setting of the upstream wired line (S47), and transmits a combining completion confirmation signal to the base station BS. (S48). Base station BS
Receives the synthesis completion confirmation signal and releases the setting of the upstream wired line (S49).

Next, a processing procedure when the end of the downlink handover is determined will be described with reference to a control sequence shown in FIG. In the base station BS, the end of the downlink soft handover is determined based on the soft handover start / end notification signal from the mobile station PS or the determination result from the soft handover start / end determination units 49 and 51 (S61). Thereafter, the base station BS transmits a soft handover end notification signal to the mobile station PS (S6).
2). This signal includes an identifier indicating that the soft handover is to be terminated on the downlink, and information specifying any one of a plurality of wireless channels on which the downlink to be released is performing the soft handover. I have.

The mobile station PS transmits a soft handover end confirmation signal to the base station BS (S63), stops receiving the designated downlink radio channel, and releases the setting of the downlink radio channel (S64). .

After stopping the transmission of the downlink radio channel, the base station BS releases the setting of the downlink radio channel (S6).
5) Further, a distribution end notification signal is transmitted to the combining distribution station MC (S66). The distribution end notification signal includes information for designating which of the plurality of distributed distribution lines to stop distribution.

After the distribution is stopped for the designated downstream wired line, the combining / distributing station MC releases the setting of the downstream wired line (S67) and transmits a distribution end confirmation signal to the base station BS (S67). S68). The base station BS
The setting of the downlink wired line is released (S69).

Although the above embodiment has been described by taking as an example the case where the present invention is applied to mobile communication using the CDMA system, the present invention is not limited to this.
It is needless to say that the present invention can be applied to a LAN using the A method and further to an arbitrary communication method for performing line switching such as soft handover.

[0117]

As described above, according to the present invention, when the soft handover is started, the start / end timing of the uplink soft handover is different from the start / end timing of the downlink soft handover. From that
This has the effect that the wireless section capacity can be optimized for both the uplink and the downlink.

[Brief description of the drawings]

FIG. 1 shows a schematic configuration of an embodiment of a mobile station apparatus to which a soft handover start / end processing execution method according to the present invention is applied and a soft handover start / end processing is executed on a mobile station side. It is a block diagram.

FIG. 2 is a block diagram showing an internal configuration of a soft handover start / end determination unit shown in FIG.

FIG. 3 shows a schematic configuration of an embodiment of a base station apparatus to which a soft handover start / end processing execution method according to the present invention is applied and a soft handover start / end processing is executed on a base station side. It is a block diagram.

FIG. 4 shows a schematic configuration of an embodiment of a mobile station apparatus to which a soft handover start / end processing execution method according to the present invention is applied and a soft handover start / end processing is executed on a base station side. It is a block diagram.

FIG. 5 is a control sequence diagram showing a processing procedure when a start of uplink handover is determined.

FIG. 6 is a control sequence diagram showing a processing procedure when a start of a downlink handover is determined.

FIG. 7 is a control sequence diagram showing a processing procedure when the end of uplink handover is determined.

FIG. 8 is a control sequence diagram showing a processing procedure when it is determined that a downlink handover has been completed.

FIG. 9 is a block diagram for explaining soft handover.

FIG. 10 is a diagram for describing a start / end trigger of a soft handover.

FIG. 11 is a diagram showing a simulation result of uplink system capacity.

FIG. 12 is a diagram illustrating simulation results of downlink system capacity.

[Explanation of symbols]

 10, 40 antenna 11, 41 transmission / reception separating unit 13, 43 communication channel receiving unit 15, 45 communication channel demodulating unit 16 combining unit 17, 47 communication channel decoding unit 19, pilot channel receiving unit 21, pilot channel receiving level measuring unit 23 , 49 Uplink soft handover start / end determination unit 25, 51 Downlink soft handover start / end determination unit 27, 53 Control unit 29, 55 Encoding unit 31, 57 Modulation unit 33, 59 Transmission unit 231, 251 Comparison unit 233, 253 Comparison parameter memory

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (29)

(57) [Claims] 1. A soft handover start / end processing execution method for temporarily switching communication from a base station that is currently performing communication to a next base station by soft handover with movement of a mobile station, wherein the soft handover is started. And when to end, the start timing and end timing of the soft handover of the uplink communication line from the mobile station to the base station, and the start timing and termination timing of the soft handover of the downlink communication line from the base station to the mobile station. Can be set independently of each other. 2. The mobile station, when determining a start timing or a termination timing of a soft handover of at least one of an uplink communication line and a downlink communication line, the mobile station transmits an uplink communication line and a downlink communication line to the base station. 2. The soft handover start / end processing execution method according to claim 1, further comprising reporting determination information relating to the determination together with identification information for identifying the soft handover. 3. The base station, based on a measurement value of a pilot channel reception level of a serving cell or sector in which the mobile station is located and a neighboring cell or sector around the serving cell or sector, which are sequentially reported from the mobile station. 2. A soft handover execution process in the determined communication line is performed independently when a start timing or an end timing of the soft handover is determined in one of the uplink communication line and the downlink communication line. The method for executing the soft handover start / end processing described above. 4. When deciding to start soft handover of an uplink communication line, the handover source base station notifies the handover destination base station and the mobile station that soft handover is to be started only for the uplink radio communication line. The mobile station newly sets up an uplink wireless communication line for a handover destination base station by using an uplink wireless communication line or using a handover source uplink wireless communication line, and the handover destination base station has a new downlink wireless communication line. , Without performing the transmission and setting process according to the above, starts the reception and setting process of the newly set uplink radio communication line, and the handover destination base station or the handover source base station sends the combined distribution station a software only for the uplink radio line. Notifying that a handover is to be started, Setting of a downlink wired communication line with the handover destination base station and setting of a new uplink wired communication line with the handover destination base station without performing information transmission to the handover destination base station via the downlink wired communication line. 4. The method according to claim 2, further comprising: starting the combining process of signals transmitted from the handover source base station and the handover destination base station via the uplink wired communication line. 5. When deciding to start soft handover of a downlink communication line, the handover source base station notifies the handover destination base station and the mobile station that soft handover is to be started only for the downlink radio communication line. The said handover destination base station performs transmission and setting processing by a newly set downlink radio communication line without performing reception and setting processing of a new uplink radio communication line, Performs reception and setting processing of a downlink radio communication line from the handover destination base station without performing setting processing of the uplink radio communication line for the base station, and performs downlink radio communication lines from the handover source base station and the handover destination base station respectively. Start the combining process of the signal transmitted in the handover destination base station or the The handover source base station notifies the combining / distributing station that soft handover is to be started only for the downlink radio channel, and the combining / distributing station sets up the uplink wired communication line with the new handover destination base station and sets the handover source. A new handover destination base station and a downstream wired communication line are set without performing a process of synthesizing signals transmitted from the base station and the handover destination base station via the upstream wired communication line, and handover to the handover destination base station is performed. 4. The method according to claim 2, wherein the transmission of the same information as the information transmitted to the source base station is started. 6. In the determination, a pilot channel reception level of a peripheral cell or sector around the mobile station is compared with a reference level, and a peripheral cell satisfying (pilot channel reception level)> (reference level A ₁ ) 4. A method according to claim 2, wherein when a pilot channel of a sector exists, a soft handover is started to a cell or a sector transmitting the pilot channel. 7. In the determination, based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and a peripheral cell or sector around the serving cell or sector, (pilot channel reception level of a serving cell / sector)
If there is a pilot channel of a peripheral cell or sector that satisfies (reception level of pilot channel of peripheral cell / sector) <(reference level difference B ₁ ), soft handover to a cell or sector transmitting the pilot channel is started. 4. The method for executing a soft handover start / end process according to claim 2, wherein: 8. When ending the soft handover of the uplink communication line is determined, the base station informs the combining and distributing station and the mobile station that the soft handover of the uplink wireless communication line is to be ended and performs the soft handover. Out of the plurality of uplink wireless communication lines that are to be released, the mobile station stops transmitting and releases the notified uplink wireless communication line, and downloads the downlink corresponding to the released uplink wireless communication line. The base station stops receiving and releasing the uplink wireless communication line, and continuously transmits the downlink wireless communication line corresponding to the released uplink wireless communication line; Stops the combining for the notified uplink wired communication line and releases the uplink wired communication line, while the downlink communication corresponding to the released uplink wired communication line is stopped. Claim 2 or 3 soft handover initiation / termination process execution method according to, characterized in that sustaining distribution to the communication line. 9. When deciding to end soft handover on the downlink communication line, the base station informs the combining and distributing station and the mobile station that soft handover on the downlink radio communication line is to be terminated and performs soft handover. Out of the plurality of downlink wireless communication lines to be released, the mobile station stops receiving and releases the notified downlink wireless communication line, and releases the uplink corresponding to the released downlink wireless communication line. The base station stops transmission of the downlink radio communication line and releases the transmission while maintaining the reception of the uplink radio communication line corresponding to the released downlink radio communication line. Stops the distribution of the notified downlink wired communication line and releases the downlink wired communication line, and releases the downlink wired communication line corresponding to the released downlink wired communication line. Claim 2 or 3 soft handover initiation / termination process execution method according to, characterized in that to sustain the synthesis of the communication line. 10. In the determination, a pilot channel reception level of a peripheral cell or a sector around the mobile station is compared with a reference level, and a pilot channel of a cell or a sector performing a soft handover is: 4. A soft handover start according to claim 2, wherein when there is a pilot channel satisfying (level) <(reference level A ₂ ), soft handover with a cell or sector transmitting the pilot channel is ended. / End processing execution method. 11. The pilot channel of a cell or sector performing a soft handover based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and a neighboring cell or sector around the serving cell or sector. , (Pilot channel reception level of serving cell / sector)
When there is a pilot channel satisfying ((pilot channel reception level of peripheral cell / sector)> (reference level difference B ₂ ), soft handover with the cell or sector transmitting the pilot channel is terminated. The method for executing a soft handover start / end process according to claim 2 or 3. 12. A base station apparatus for performing a soft handover to switch communication from a base station currently performing communication to a next base station in accordance with movement of a mobile station, wherein the base station apparatus receives a signal from the mobile station. Extracting means for extracting a reception level measurement value measured by the mobile station; and determining a trigger for starting soft handover of communication from the mobile station to the base station based on the reception level measurement value obtained by the extraction means. Ascending start timing determining means, Downward starting timing determining means for determining starting timing of soft handover from a base station to a mobile station based on the reception level measurement value obtained by the extracting means, A soft handover start timing of communication from the mobile station to the base station based on the soft handover start timing determined by the downlink start timing determining means;
Control means for independently setting and controlling the start timing of soft handover from the base station to the mobile station. 13. An up start trigger determining unit and a down start trigger determining unit each include a storage unit that stores a reference value for determining a start trigger, and a comparing unit that compares the reference value with the measured reception level. 13. The base station apparatus according to claim 12, comprising: 14. The comparing means compares a pilot channel reception level of a peripheral cell or a sector around the mobile station with a reference level, and obtains a value that satisfies (pilot channel reception level)> (reference level A ₁ ). 14. The base station apparatus according to claim 13, wherein when a pilot channel of a cell or a sector exists, soft handover to a cell or a sector transmitting the pilot channel is started. 15. The reception means according to claim 1, further comprising: a pilot cell reception level of a serving cell or sector in which the mobile station is located and a peripheral cell or sector around the serving cell or sector. )
If there is a pilot channel of a peripheral cell or sector that satisfies (reception level of pilot channel of peripheral cell / sector) <(reference level difference B ₁ ), soft handover to a cell or sector transmitting the pilot channel is started. The base station apparatus according to claim 13, wherein: 16. A base station apparatus for performing a soft handover to switch communication from a base station currently performing communication to a next base station in accordance with movement of a mobile station, wherein the base station apparatus receives a signal from the mobile station. Extracting means for extracting a reception level measurement value measured by the mobile station; and determining an end of soft handover of communication from the mobile station to the base station based on the reception level measurement value obtained by the extraction means. An uplink end trigger determining unit, a downlink end trigger determining unit that determines a soft handover end trigger from the base station to the mobile station based on the reception level measurement value obtained by the extracting unit, and the uplink end trigger determining unit. A soft handover termination timing of communication from the mobile station to the base station based on the soft handover termination timing determined by the downlink termination timing determination means,
A base station apparatus, comprising: control means for setting and controlling the timing of ending soft handover from the base station to the mobile station. 17. The upward ending trigger determining means and the downward ending trigger determining means each store a reference value for determining the ending trigger, and comparing means for comparing this reference value with the reception level measurement value. 17. The base station apparatus according to claim 16, comprising: 18. The base station apparatus according to claim 13, wherein said storage means stores a reference level set independently for each of an uplink communication line and a downlink communication line. 19. The comparison means compares a pilot channel reception level of a peripheral cell or sector around the mobile station with a reference level, and obtains a pilot channel of a cell or sector performing soft handover, receiving level) <(when the pilot channel to satisfy the reference level a ₂₎ is present, the base station apparatus according to claim 17, wherein the ends of the soft handover between the cell or sector transmitting the pilot channel. 20. The comparing means, based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and a neighboring cell or sector around the serving cell or sector, includes a pilot of a cell or sector performing a soft handover. In the channel, (Pilot channel reception level of serving cell / sector)
When there is a pilot channel satisfying ((pilot channel reception level of peripheral cell / sector)> (reference level difference B ₂ ), soft handover with the cell or sector transmitting the pilot channel is terminated. The base station device according to claim 17, wherein 21. A mobile station apparatus for performing a soft handover to switch communication from a base station currently performing communication to a next base station in accordance with movement of the mobile station, wherein the mobile station apparatus receives a signal from the base station. Measuring means for measuring the reception level based on the received level and outputting the measured value; and triggering a soft handover of the communication from the mobile station to the base station based on the measured value of the reception level measured by the measuring means. An uplink start timing determining unit that determines a start timing of a soft handover from a base station to a mobile station based on a reception level measurement value measured by the measurement unit; and an uplink start timing determining unit. A soft handover start timing of communication from the mobile station to the base station based on the soft handover start timing determined by the determination unit and the downlink start timing determination unit;
Control means for setting and controlling the timing of starting soft handover from the base station to the mobile station, respectively. 22. An up start trigger determining unit and a down start trigger determining unit each storing a reference value for determining a start trigger, and comparing unit comparing the reference value with the measured reception level. 22. The mobile station device according to claim 21, comprising: 23. The comparing means compares a pilot channel reception level of a peripheral cell or a sector around the mobile station with a reference level, and obtains a value that satisfies (pilot channel reception level)> (reference level A ₁ ). 23. The mobile station apparatus according to claim 22, wherein when a pilot channel of a cell or a sector exists, soft handover to a cell or a sector transmitting the pilot channel is started. 24. The comparing means, based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and peripheral cells or sectors around the serving cell or sector, )
If there is a pilot channel of a peripheral cell or sector that satisfies (reception level of pilot channel of peripheral cell / sector) <(reference level difference B ₁ ), soft handover to a cell or sector transmitting the pilot channel is started. 23. The mobile station device according to claim 22, wherein: 25. A mobile station device for performing a soft handover to switch communication from a base station currently performing communication to a next base station in accordance with movement of the mobile station, wherein a signal from the base station is received. Measuring means for measuring the received level based on the measured signal and outputting the measured value; and timing for ending the soft handover of the communication from the mobile station to the base station based on the measured value of the received level measured by the measuring means. An uplink end trigger determining means for determining the end of the soft handover from the base station to the mobile station based on the reception level measurement value measured by the measuring means; A soft handover termination timing of communication from the mobile station to the base station based on the soft handover termination timing determined by the determination unit and the downlink termination timing determination unit;
A mobile station device comprising: a control unit for setting and controlling a timing of ending soft handover from a base station to a mobile station. 26. A storage means for storing a reference value for judging an end trigger, and a comparing means for comparing this reference value with the measured reception level. 26. The mobile station device according to claim 25, comprising: 27. The mobile station apparatus according to claim 22, wherein said storage means stores a reference level set independently for each of an uplink communication line and a downlink communication line. 28. The comparing means compares a pilot channel reception level of a peripheral cell or sector around the mobile station with a reference level, and obtains a pilot channel of a cell or sector performing soft handover, receiving level) <(when the pilot channel to satisfy the reference level a ₂₎ is present, the mobile station apparatus of claim 26, wherein the ends of the soft handover between the cell or sector transmitting the pilot channel. 29. The comparing means, based on a pilot channel reception level of a serving cell or sector in which the mobile station is located and a neighboring cell or sector around the serving cell or sector, performs pilot of a cell or sector performing soft handover. In the channel, (Pilot channel reception level of serving cell / sector)
When there is a pilot channel satisfying ((pilot channel reception level of peripheral cell / sector)> (reference level difference B ₂ ), soft handover with the cell or sector transmitting the pilot channel is terminated. The mobile station device according to claim 26, wherein