JP2001128206A - Zone shift system in packet communication by personal digital cellular system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zone shift system by which a zone shift is attained at high-speed, a processing load of a base station can be relieved and the throughput of packet communication of a mobile station is not deteriorated. SOLUTION: Information of a packet communication physical channel of a zone shifted by using an idle time of packet communication is acquired and stored in advance, and when a zone shift decision condition is established, the zone is directly switched to a packet communication physical channel of a shift destination zone on the basis of the stored information of the packet communication physical channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zone transfer method in packet communication by a personal digital cellular system, and more particularly, to a high-speed zone transfer and a reduction in processing load on a base station. The present invention relates to a zone transfer method for packet communication by a personal digital cellular system, which does not lower the packet communication throughput of a mobile station due to zone transfer.

[0002] Mobile telecommunications were first developed by analog cellular
It was put into practical use by the system, and was first put to practical use in 1979 in Japan.

[0003] Thereafter, responding to the growing demand for mobile communications,
New development is being pursued with the aim of improving the services to be provided and miniaturizing the hardware. As a so-called large-capacity system, the capacity is greatly increased compared to the initial system, and the base station is downsized / high performance As a result, a system capable of providing various services has been put to practical use.

Further, in order to cope with the liberalization of communications in the field of mobile communications, studies are being made to promote the unification of air interfaces, and digital car telephone system standards are formulated. In order to realize inter-roaming, the study of the procedure for referencing user class information between networks and the automatic tracking connection method across networks have been studied. In 1993, a PDC (Personal Digital Celler) digital mobile communication node-to-node interface mobile communication It was established as an application department signaling system.

In 1993, the service of a personal digital cellular system using the 800 MHz band was started, and in 1994 the service of a personal digital cellular system using the 1.5 GHz band was started.

[0006] Such personal digital cellular
The features of the system include (1) higher quality of voice transmission, higher quality of facsimile communication / data communication, higher security / authentication functions, higher service of bearer services and additional services, etc. (2 ) Improvement of frequency utilization efficiency (3) The introduction of the TDMA (Time Domain Multiple Access) system is making the system more economical, and mobile communication has been greatly developed.

Now, personal digital cellular
In the system, logical channels as shown in FIG. 22 are prepared for communication and wireless channel control.

[0008] Information Channel (TCH: Traffic Channel)
Is a channel that, once assigned to a certain user, can be exclusively used by that user until the communication ends.

Control channel (CCH)
Is a channel for transferring a control signal necessary for connection control, and is a common access channel (CAC: Common Acces
sChannel) and user exclusive channel (USC: User Sp)
ecific Channel).

The common access channel is a control channel commonly used by mobile stations (mobile terminals such as portable telephones and automobile telephones), and includes the following three types of channels.

(1) A broadcast channel (BCCH: Broadcasting Control Channel) for transferring information to be broadcast from the base station to the mobile station, such as the location registration area number of the zone.

(2) A paging channel (PCH: Paging) for simultaneously paging in a plurality of zones when a call arrives at a mobile station.
Channel) and a common control channel (CCCH) which is a generic name of a common bidirectional control channel (SCCH: Signaling Control Channel) for transferring control information other than broadcast information and paging information required for connection control.
el) (3) User Packet Channel (UPCH) used to provide wireless packet service
Channel) Since the user / proprietary channel is used in association with the information channel, the associated control channel (ACCH: As
A so-called SCICH (Slow Associated Control Channel) that transmits low-speed control information without interrupting the transfer of user information.
nel) and a high-speed associated control channel FACCH: Fast A for temporarily suspending the transfer of user information and transmitting control information at a high speed.
ssociated Control Channel).

Using the above logical channels, the mobile station performs location registration and outgoing calls, and the base station performs alerting and paging at the time of incoming calls. Then, the mobile station can perform data transmission by a packet communication method using a user packet channel.

FIG. 21 is a conceptual diagram of a zone shift at the time of packet communication in a personal digital cellular system.

In FIG. 21, 101 is a base station installed at point A, 102 is a base station installed at point B, 103 is zone A under base station 101, and 104 is zone B under base station 102. , 105 are mobile stations moving from zone A to zone B while performing packet communication.

The mobile station 105 receives broadcast information from the base station using the common access channel on the control physical channel, acquires information on the user packet channel in the visited zone, and terminates the incoming call. The call is waiting and the call is made using the common access channel.

When a packet communication call is received or when a call is made by itself, a packet communication physical channel is activated based on the information obtained by the broadcast information to switch to a user packet channel. Performs packet communication.

A mobile station during packet communication uses an empty time slot to receive a reception level of a packet communication physical channel in use, that is, a visited zone (this is referred to as its own station level) and its surroundings. It measures the reception level of a perch channel, which is a control physical channel set in advance in the base station of the zone (this is referred to as a peripheral level). Is determined based on the relationship with the above, and if the conditions for the zone transfer are satisfied, the zone transfer is performed.

There are the following two types of zone transfer.

(1) High-speed zone transfer method In this method, the number of a perch channel corresponding to a peripheral zone from which a mobile station wants to perform zone transfer is determined by a zone information request signal by using a zoned packet communication physical channel. The base station that has transmitted to the station and received the zone information returns information such as the packet communication physical channel of the requested peripheral zone to the mobile station by a zone information notification signal,
The mobile station directly switches to a packet communication channel of a peripheral zone based on the received zone information, that is, performs a zone shift.

Naturally, the time for switching is short, and the switching does not significantly reduce the throughput of packet communication.

(2) Low-speed zone transfer method This is to temporarily close the packet communication physical channel when the level of the packet communication physical channel used by the mobile station is deteriorated and communication becomes impossible. The mobile station re-measures the reception level for all perch channels at the current position, opens a packet communication control channel with the base station having a high reception level, acquires zone information by broadcast information, and acquires This is a system in which switching to a packet communication physical channel is performed based on zone information, that is, switching to a packet communication physical channel once via a packet communication control channel.

Naturally, since a so-called control channel search is performed, the time required for switching is long, and the throughput of packet communication must be reduced.

According to the present invention, the zone transfer method at the time of the packet communication can be changed at a high speed, the throughput of the packet communication of the mobile station does not decrease due to the zone transfer, and the processing of the base station accompanying the zone transfer can be performed. It is to be improved so that the load can be reduced.

[0025]

2. Description of the Related Art FIG. 10 shows a functional configuration of a conventional radio control unit for realizing the above-mentioned zone shift system.

In FIG. 10, reference numeral 1 denotes a radio control unit for controlling a standby state, a standby state control unit 11 for controlling a standby state and a voice communication and a packet communication. A voice communication control unit 12 and a packet communication control unit 2b for controlling transmission and reception of packet communication are provided.

Reference numeral 3b denotes a control memory for storing information necessary for processing performed by the radio control unit 1, and 4 denotes a reception level of a packet communication physical channel during communication, that is, a local station level, and a perch of a base station in the vicinity. This is a level measuring device that measures the reception level of the channel, that is, the surrounding level.

In the control memory 3b, 31 is
FIG. 11 shows a configuration example of a perch channel table storing a frequency code corresponding to the number of the perch channel.

Reference numeral 32 denotes a level-ordered perch channel table which stores reception levels corresponding to perch channel numbers in the order of levels and stores them. FIG. 12 shows a configuration example of the level-ordered perch channel table.

Reference numeral 33 denotes a visited zone information table which stores the acquired information, that is, the number of the perch channel of the visited zone and the number of the packet communication physical channel in association with each other. An example of the configuration is shown.

Further, in the packet communication control unit 2b,
Reference numeral 21 denotes a packet communication state control unit that periodically measures the reception level of the perch channel stored in the perch channel table using the level measuring device 4. The level determination control unit 23 that controls the zone shift based on the reception level notified from the base station and the zone information and the zone shift determination condition notified from the base station is started by the level determination control unit 22b, A zone information request signal including the perch channel notified from the control unit 22b is transmitted to the base station, a zone information notification signal that is a response to the zone information request signal is received from the base station, and the received zone information is transmitted to the base station. The zone information acquisition unit 24 that notifies the determination control unit 22b is activated by the level determination control unit 22b, and The reception level of the perch channel is set to the tree channel table stops when signals measured by the level measuring base station, the level determination control unit 22b
, A packet communication control channel selector for transferring to
This is a packet communication physical channel selection unit that is started by the level determination control unit 22b and starts a packet communication physical channel based on the visited zone information table 33.

The operation of each of the packet communication state control unit 21, level measurement control unit 22b, zone information acquisition unit 23, packet communication control channel selection unit 24, and packet communication physical channel selection unit 25 will be described.

FIG. 14 is a flowchart for explaining the operation of the packet communication state control unit. FIG. 14 shows a perch channel table and a level-ordered perch channel table (in the figure, “per-level perch CH · T”).
Abbreviated. In the figures, they may be described by a similar notation. Hereinafter, the operation of the packet communication state control unit will be described along the reference numerals in FIG.

S81. Perch channel table (abbreviated as “perch CH · T” in the figure. In the figure,
It may be described by a similar notation. ) To obtain a channel number (abbreviated as “CH number” in the figure, which may be described by a similar notation in the figure).

S82. Start the level meter.

S83. The level measurement result is received from the level measuring device.

S84. It is determined whether all the measurement results have been received.

If it is determined that all the measurement results have not been received (No), the process returns to step S82, and steps S82 and S83 are repeated until all the measurement results have been received.

S85. If it is determined in step S84 that all the measurement results have been received (Yes), the received peripheral level measurement results are sorted.

S86. The result of sorting in step S85 is stored in the permutation perch channel table.

S87. The level determination control unit is started, the measured own station level is transmitted to the level determination control unit, and a series of operations ends.

FIG. 15 is a flowchart for explaining the operation of the zone information acquisition section. Hereinafter, the operation of the zone information acquisition unit will be described along the reference numerals in FIG.

S101. It is determined whether or not activation has been received from the level determination control unit.

If it is determined that the activation has not been received from the level determination control unit (No), the process returns to the beginning of this step, and the determination of the presence or absence of activation is continued.

S102. If it is determined that activation has been received from the level determination control unit (Yes), a zone information request signal is transmitted to the base station.

S103. It is determined whether a zone information notification signal has been received from the base station.

If the zone information notification signal has not been received from the base station (No), return to the beginning of this step,
Continue to determine the presence or absence of reception.

S104. If a zone information notification signal has been received from the base station (Yes), the received zone information notification signal is transmitted to the level determination control unit, and a series of operations ends.

FIG. 16 is a flowchart for explaining the operation of the packet communication physical channel selector. Note that FIG.
Also shows the zone information table. Hereinafter, among the operations of the packet communication physical channel selection unit, the opening operation of the packet communication physical channel will be described along the reference numerals in FIG.

S111. It is determined whether or not activation has been received from the level determination control unit.

If it is determined that no activation has been received from the level determination control unit (No), the process returns to the beginning of this step, and the determination of the presence or absence of activation is continued.

S112. If it is determined that the activation has been received from the level determination control unit (Yes), the physical channel number of the packet communication is referred to by referring to the visited zone information table (in the figure, “channel” is described as “CH”. Also,
A similar notation may be used where necessary. still,
“CH” is an abbreviation using the first two letters of “Channel”. ) To get.

S113. Synchronize with the obtained packet communication physical channel, open a packet communication channel,
The opening operation of the packet communication physical channel ends.

FIG. 17 is a flowchart for explaining the operation of the packet communication control channel selector. Hereinafter, FIG.
The operation of the packet communication control channel selector will be described along the reference numeral 7. FIG. 17 shows a perch channel
The table, level perch channel table, and zone information table are also shown.

S121. With reference to the level-ordered perch channel table, a packet communication control channel (abbreviated as "control channel" in the figure) is opened in descending order of level, and necessary information is received.

S122. It is determined whether necessary information has been successfully received.

S123. If the reception of the necessary information has failed in step S122 (No), it is determined whether or not the reception has failed on all the perch channels.

If the reception has failed on all the perch channels (Yes), it is determined that the packet communication control channel cannot be selected, and the process is temporarily terminated.

S124. If the necessary information has been successfully received in step S122 (Yes), the received information is written in the visited zone information table, and a series of operations ends.

FIG. 18 shows a conventional condition for determining a zone shift. Hereinafter, the determination condition of the zone shift will be briefly described along the reference numerals in FIG.

S91. It is determined whether the reception level of the packet communication physical channel in use, that is, the own station level is higher than the packet communication permission level specified by the base station.

S92. If it is determined in step 91 that the own station level is higher than the permission level (Yes), the count value of the level deterioration counter for counting the number of level deteriorations is cleared.

S93. On the other hand, when it is determined in step 91 that the own station level is lower than the permission level (No), it is determined whether the own station level is higher than the deterioration level specified by the base station.

S94. If it is determined in step S93 that the own station level is higher than the deterioration level (Yes),
The count value of the level deterioration counter is incremented.

S95. It is determined whether or not the count value of the level deterioration counter is larger than a predetermined number of times of level deterioration specified by the base station.

S96. In step S91, it is determined that the own station level is higher than the permission level (Yes), and in step S95, it is determined that the count value of the level deterioration counter is smaller than the predetermined number of level deteriorations (N
In o), it is determined whether or not the maximum value of the peripheral level, which is the reception level of the perch channel in the peripheral zone, is higher than the level obtained by adding the strong electric field determination level difference designated by the base station to the own station level. I do.

If it is determined that the maximum value of the peripheral level is higher than the level obtained by adding the strong electric field determination level difference designated by the base station to the own station level (Yes), the communication conditions in the peripheral zone are determined. It is more preferable that the zone information can be obtained using the packet communication physical channel.

On the other hand, when it is determined that the maximum value of the peripheral level is lower than the level obtained by adding the strong electric field determination level difference designated by the base station to the own station level (No), the own station level is the best. Since the communication condition is satisfied, the communication is continued.

S97. If it is determined in step S95 that the count value of the deterioration counter is larger than the predetermined number of times of deterioration (Yes), the maximum value of the peripheral level is set to the connection permission level designated by the base station as the own station level. It is determined whether the level is higher than the level obtained by adding the difference.

If it is determined that the maximum value of the peripheral level is lower than the level obtained by adding the connection permission level difference designated by the base station to the own station level (No), the own station level is currently the best. Since the condition is the communication condition, the communication is continued.

On the other hand, when it is determined that the maximum value of the peripheral level is higher than the level obtained by adding the connection permission level difference designated by the base station to the own station level (Yes), the peripheral zone performs communication. Since conditions are good and zone information can be obtained using a packet communication physical channel, high-speed zone transfer is performed.

S98. When it is determined in step S93 that the own station level is lower than the deterioration level (No), the count value of the level deterioration counter is cleared.

In this case, the continuation of the packet communication is not preferable, and it is difficult to obtain the zone information through the packet communication physical channel.

The mobile station performs the following series of operations by combining the above operations of the respective parts in FIG.

That is, when the mobile station in the standby state starts packet communication, the standby state control unit 11 in FIG. 10 refers to the packet communication physical channel number stored in the area information table 33, and The packet communication physical channel is opened using the packet communication physical channel selection unit 25 in FIG. 10 and the packet communication state control unit 21 is started.

The packet communication state control unit 21 measures the reception level of the currently used packet communication physical channel, that is, the own station level, and the reception level of the packet communication control physical channel corresponding to the perch channel of the peripheral zone, that is, the peripheral level. Is performed using the level measuring device 4 and transferred to the level determination control unit 22.

The level determination control unit 22 sorts the received measurement results, arranges them in order of level, stores them in the level-order perch channel table 32, and performs zone transfer based on the zone transfer determination condition notified from the base station. Judgment and zone shift control are performed.

The zone shift control is roughly based on one of the following two types of control.

First, when the local station level is a level at which packet communication is possible, the zone information acquisition unit is activated to acquire information on the migration destination zone using the packet communication physical channel in the area where the zone is located, and based on the acquired information. To switch to the destination packet communication physical channel. That is, zone transfer is performed according to the high-speed zone transfer method.

On the other hand, if the own station level is a level at which packet communication is not possible, the packet communication control physical channel is activated and the reception levels are measured for all the perch channels at the current position. A communication control physical channel is selected and opened, broadcast information is received from the base station, and a packet communication physical channel is switched based on the received broadcast information. That is, zone transition is performed according to the low-speed zone transition method.

[0081]

However, the above-mentioned high-speed zone transfer method has two problems.

First, in order to reduce the processing load for zone shift, the base station specifies a shift determination condition so as to shift to the high-speed zone only when the difference between the local station level and the peripheral level is large. In such a case, high-speed zone transition is practically impossible.

FIG. 19 is a diagram (part 1) for explaining the problem of the conventional zone shift, and is a diagram for explaining the above problem.

In FIG. 19, 101 is a base station installed at point A, 102 is a base station installed at point B, 103 is zone A under base station 101, and 104 is zone B under base station 102. , 105 are mobile stations moving from zone A to zone B while performing packet communication.

FIG. 19 also shows how the detected reception level changes depending on the location.

The mobile station during packet communication uses the vacant time slot to receive the reception level of the packet communication physical channel in the visited zone, that is, its own station level, and the control physical station preset in the base station in the surrounding zone. The reception level of the perch channel, that is, the peripheral level is measured, and the zone transition is determined based on the relationship between the local station level, the peripheral level, and the designated level, and the zone transition is performed if necessary.

The first problem is that if the condition is such that the mobile station can be shifted only when the difference between the local station level and the peripheral level is large, the mobile station uses the packet communication physical channel for the first time at the point where the local station level has decreased to some extent. Originating from transmitting the zone information request signal.

Since the mobile station transmits the zone information request signal at the point where the level of the own station is lowered, the zone information request signal does not reach the base station A or is returned from the base station A. There is a possibility that the zone information notification signal cannot be normally received. In this case, the mobile station maintains packet communication on the current packet communication physical channel,
The zone information request signal is transmitted again.

If the zone information notification signal cannot be received even if transmission of the zone information request signal is attempted a plurality of times, the mobile station determines that communication is not possible, measures the reception levels of all the perch channels again, and determines the level. A perch channel having a high communication channel, open a packet communication control channel corresponding to the selected perch channel, receive broadcast information from the base station, obtain zone information from the received broadcast information, and obtain a packet communication physical channel. Is switched.

That is, as a result of a plurality of attempts to shift to the high-speed zone, the high-speed zone cannot be shifted, and the physical channel for packet communication is switched by shifting to the low-speed zone.

When the channel search and the channel switching are performed based on the low-speed zone transfer method, the switching time is long, and normal packet communication cannot be performed during the channel search and the channel switching. I do.

The second problem is that if the level difference between the local station level and the peripheral level in the zone shift determination condition is specified to be small to solve the above problem, the mobile station moves at low speed near the boundary between the two zones. The risk is that unnecessary zone transitions may occur when the system is in use.

FIG. 20 is a diagram (part 2) for explaining the problem of the conventional zone shift, and is a diagram for explaining the above problem.

In FIG. 20, 101 is a base station installed at point A, 102 is a base station installed at point B, 103 is a zone A under the base station 101, and 104 is a zone B under the base station 102. , 105 are mobile stations moving from zone A to zone B while performing packet communication.

FIG. 20 also shows how the detected reception level changes depending on the location.

In this case, the mobile station 105 is located at an intermediate point between the zone A and the zone B, and switches to the packet communication physical channel of the base station B in the zone B based on the zone information notification signal from the base station A at the point A. Assume that you have done it.

After the switching, the mobile station obtains the zone information by communicating with the base station B at the point B. At this time, if the reception level of the base station B at the point B and the reception level of the base station A at the point A fluctuate even though the mobile station is not moving much, the level difference between the own station level and the peripheral level is obtained. Since it is designated small, the mobile station that has once switched to the packet communication physical channel of the base station B at the point B may switch again to the packet communication physical channel of the base station A at the point A. Moreover, this switching operation may be repeatedly performed, that is, hunting may be performed.

During this time, the request and the notification of the zone information are repeated, so that the load of the shift processing is applied to the base stations A and B, and the throughput of the packet communication is reduced at the mobile station. Become.

The present invention has been made in view of the above-mentioned problems, and it is possible to perform zone transfer at a high speed, reduce the processing load on the base station, and do not reduce the packet communication throughput of the mobile station. An object of the present invention is to provide a zone transfer method in packet communication by a digital cellular system.

[0100]

The first means of the present invention is as follows.
A new perimeter zone information table that stores the perch channel and packet communication physical channel number of the perimeter zone in the control memory, and the perch channel number and the detection reception level are stored in the permutation perch channel table in order of level In the peripheral zone information table, the perch channel number of the peripheral zone and the corresponding packet communication physical channel number are stored, and if the own station level is higher than the degradation level, the permuted perch is used. The perch channel number having the maximum peripheral level is extracted from the channel table, and if the maximum peripheral level is lower than the degradation level, communication is continued without performing zone transfer. If the transition judgment condition is not satisfied, the communication is continued and the maximum peripheral level becomes lower than the deterioration level. If the zone transition determination condition is satisfied, the number of the perch channel of the maximum peripheral level is extracted from the peripheral zone information table, and the perch channel number of the zone where the mobile station is located and the perch channel number are extracted. A high-speed zone transfer process is performed by setting the zone information table in which the number of the packet communication physical channel corresponding to the perch channel number is stored, and if the own station level is lower than the deterioration level, the level sequential perch channel Searching the table for a perch channel of a peripheral level higher than the deterioration level, and if a search result is present in the peripheral zone information table, the information obtained from the peripheral zone information table is stored in the serving zone information table If the search result does not exist in the peripheral zone information table, the low-speed zone It is a technique for down migration process.

According to the first means of the present invention, the peripheral zone information is acquired in advance and stored in the peripheral zone information table, and the zone shift determination is performed with reference to the peripheral zone information table. It is possible to avoid a prolonged zone shift due to failure of zone information acquisition at the time.

The second means of the present invention comprises a previous visited zone information table for storing the numbers of the previously located perch channel and the packet communication physical channel, and a level-ordered perch channel table. Stores perch channel numbers and detected reception levels in order of level,
The previously visited zone information table stores the perch channel number of the previously visited zone and the corresponding packet communication physical channel number. If the own station level is higher than the degradation level, the level stops. The perch channel number of the maximum peripheral level is extracted from the tree channel table, and when the maximum peripheral level is lower than the deterioration level and when the maximum peripheral level is higher than the deterioration level, the zone transition determination condition is not satisfied. If communication continues, the maximum peripheral level is higher than the degradation level, and if the zone shift determination condition is satisfied, the perch channel number and packet communication physical channel number of the zone where the zone was located last time are changed. The permutation channel number and the packet communication physics of the zone where the zone is currently located are stored in the previous location information table to be stored. The high-speed zone transfer process is performed by setting the storage contents of the visited zone information table that stores the channel number, and when the own station level is lower than the deterioration level, the level is higher than the deterioration level in the permuted perch channel table. When a search is performed for a perch channel of a level and the search result is present in the previous zone information table, the storage contents of the zone zone information table are set in the previous zone information table, and the high-speed zone shift is performed. When processing is performed and the search result does not exist in the previous zone information table,
This is a technique for performing low-speed zone shift processing.

According to the second means of the present invention, zone information is not obtained for a perch channel previously stored in the visited zone information table. Is repeated, it is possible to avoid an increase in the processing load of the base station and a decrease in the throughput of packet communication of the mobile station without repeating the acquisition of the zone information.

It is also possible to combine the first means and the second means of the present invention.

That is, the perch channel number and the detected reception level are stored in the level order perch channel table in order of level, and the perch channel number of the peripheral zone and the corresponding packet are stored in the peripheral zone information table. The communication physical channel number is stored, and in the previous zone information table, the perch channel number of the zone in which the mobile station was last located and the corresponding packet communication physical channel number are stored. If higher, retrieve the perch channel number of the maximum peripheral level from the level sequential perch channel table, and if the maximum peripheral level is lower than the degradation level, continue communication;
When the maximum peripheral level is higher than the deterioration level, the satisfaction of the zone transition determination condition is tested with reference to the peripheral zone information table. If the zone transition determination condition is not satisfied, communication is continued, and the zone transition determination condition is satisfied. Is satisfied, the high-speed zone transfer processing is performed with reference to the previous zone information table, and if the own station level is lower than the deterioration level, a perch channel of a peripheral level capable of packet communication is searched for, When the search result is present in the previous zone information table, the high-speed zone transfer process is performed. When the search result is not present in the previous zone information table but is present in the peripheral zone information table, the high-speed zone transfer process is performed. If the result does not exist in the previous zone information table and does not exist in the peripheral zone information table, the low-speed zone shift processing It is performed by technology.

By combining the first means and the second means of the present invention, it is possible to avoid a prolonged zone shift due to a failure in zone information acquisition in the visited zone, and the reception level is unstable. Therefore, even if the zone transition is repeated, the acquisition of the zone information is not repeated,
It is possible to avoid an increase in the processing load of the base station and a decrease in the throughput of packet communication of the mobile station.

[0107]

FIG. 1 shows a first embodiment of a radio control unit according to the present invention.

In FIG. 1, reference numeral 1 denotes a radio control unit for controlling a standby state, a standby state control unit 11 for controlling a voice communication and a packet communication, and controlling the transmission and reception of voice communication. A voice communication control unit 12 and a packet communication control unit 2 for controlling transmission and reception of packet communication are provided.

Reference numeral 3 denotes a control memory for storing information necessary for processing performed by the radio control unit 1. Reference numeral 4 denotes a reception level of a packet communication physical channel during communication, that is, a local station level, and a perch of a base station in the vicinity. This is a level measuring device that measures the reception level of the channel.

In the control memory 3, reference numeral 31 denotes a perch channel table for storing a frequency code corresponding to the number of the perch channel. FIG. 11 shows a configuration example of the perch channel table.

Reference numeral 32 denotes a level-ordered perch channel table which stores reception levels corresponding to the numbers of perch channels in the order of levels and stores them. FIG. 12 shows a configuration example of the level-ordered perch channel table. I have.

Reference numeral 33 denotes a visited zone information table for storing the acquired information, that is, the number of the perch channel of the visited zone and the number of the packet communication physical channel in association with each other. 2 shows a configuration example.

Reference numeral 34 denotes a peripheral zone information table which stores the number of the perch channel of the peripheral zone and the number of the packet communication physical channel associated with the perch channel, and is a newly provided table.

FIG. 2 shows a configuration example of the peripheral zone information table.

Then, the mobile station performs the following series of operations by combining the operations of the respective parts in FIG.

That is, when the mobile station in the standby state starts packet communication, the mobile station 1 in FIG.
1 with reference to the packet communication physical channel number stored in the visited zone information table 33, the packet communication physical channel is opened using the packet communication physical channel selector 25 in FIG. Activate the state control unit 21.

The packet communication state control unit 21 measures the reception level of the currently used packet communication physical channel, that is, the own station level, and the reception level of the packet communication control physical channel corresponding to the perch channel of the peripheral zone, that is, the peripheral level. Is performed using the level measuring device 4, the received measurement results are sorted and arranged in order of level, and stored in the level-ordered perch channel table 32.

The level determination control section 22 performs zone transition determination and zone transition control based on the zone transition determination condition notified from the base station.

The zone shift control is roughly as follows.

If the own station level is higher than the degradation level, the perch channel number having the largest peripheral level is extracted from the permuted perch channel table, and if the maximum peripheral level is lower than the degradation level, zone transition is performed. If the maximum peripheral level is higher than the degradation level and the zone shift determination condition is not satisfied,
If the communication is continued and the maximum peripheral level is higher than the deterioration level and the zone transition determination condition is satisfied, the number of the perch channel of the maximum peripheral level is extracted from the peripheral zone information table, and the mobile station is located. The perch channel number of the zone being served and the number of the packet communication physical channel corresponding to the perch channel number are set in the visited zone information table, and the high-speed zone transfer process is performed. If it is lower, a perch channel of a peripheral level higher than the degradation level is searched in the level-ordered perch channel table, and if a search result is present in the peripheral zone information table, the search is performed from the peripheral zone information table. The acquired information is stored in the visited zone information table, and a high-speed zone transfer process is performed. If not present in the emissions information table 3 to perform low-speed zone transfer process is a second embodiment of a radio controller of the present invention.

In FIG. 3, reference numeral 1 denotes a radio control unit for controlling a standby state, a standby state control unit 11 for controlling a voice communication and a packet communication, and controlling the transmission and reception of voice communication. A voice communication control unit 12 and a packet communication control unit 2a for controlling transmission / reception of packet communication are provided.

Reference numeral 3a denotes a control memory for storing information necessary for processing performed by the radio control unit 1, and 4 denotes a reception level of a packet communication physical channel during communication, that is, a local station level, and a perch of a peripheral base station. This is a level measuring device that measures the reception level of the channel.

In the control memory 3a, 31 is
FIG. 11 shows a configuration example of a perch channel table which stores a frequency code corresponding to the number of a perch channel.

Reference numeral 32 denotes a level-ordered perch channel table for storing reception levels corresponding to the numbers of the perch channels, sorted in order of level, and FIG. 12 shows a configuration example of the level-ordered perch channel table. I have.

Reference numeral 33 denotes a visited zone information table that stores the acquired information, that is, the number of the perch channel of the visited zone and the number of the packet communication physical channel in association with each other. 2 shows a configuration example.

Reference numeral 35 denotes a previous location information table which stores the number of the perch channel and the packet communication physical channel number of the zone in which the zone was located last time, and is a newly provided table. FIG. 4 shows an example of the configuration of the previous zone information table.

Further, in the packet communication control unit 2a,
Reference numeral 21 denotes a packet communication state control unit for periodically measuring the reception level of the perch channel stored in the perch channel table using the level measuring device 4. FIG. The operation of FIG.

Reference numeral 22a denotes a level determination control unit for controlling zone transfer based on the reception level notified from the packet communication state control unit 21, the zone information notified from the base station, and the zone transfer determination condition. The operation of the level determination control unit is different from the conventional one, and will be described later in detail.

Reference numeral 23 denotes a zone information request signal which is activated by the level judgment control unit 22a and includes a perch channel including the perch channel notified from the level judgment control unit 22a to the base station. FIG. 15 shows the operation of a zone information acquisition unit that receives an information notification signal from a base station and notifies the level determination control unit 22a of the received zone information.

The level determination control unit 22a is activated by the level determination control unit 22a, measures the reception level of the perch channel set in the perch channel table during packet communication by the level measurement base station, and
a in the packet communication control channel selector for transferring to
6 shows the operation of the packet communication physical channel selection unit.

Reference numeral 25 denotes a packet communication physical channel selector which is activated by the level determination controller 22a and activates a packet communication physical channel based on the zone information table 33. FIG. 17 shows the packet communication control channel selector. The operation is shown.

Then, the mobile station performs the following series of operations by combining the operations of the respective parts in FIG.

That is, when the mobile station in the standby state starts the packet communication, the standby state control unit 1 shown in FIG.
1, the packet communication physical channel is stored using the packet communication physical channel selection unit 25 shown in FIG. 3 with reference to the packet communication physical channel number stored in the location information table 33. The control unit 21 is started.

The packet communication state control unit 21 measures the reception level of the currently used packet communication physical channel, that is, the own station level, and the reception level of the packet communication control physical channel corresponding to the perch channel of the peripheral zone, that is, the peripheral level. Is performed using the level measuring device 4, the received measurement results are sorted and arranged in order of level, and stored in the level-ordered perch channel table 32.

The level determination control section 22a performs zone transition determination and zone transition control based on the zone transition determination condition notified from the base station.

The zone shift control is roughly as follows.

A previously-existing zone information table for storing the numbers of the previously-located perch channel and the packet communication physical channel is provided. The level-order perch channel table includes the perch channel number and the detected perch channel number. The reception levels are stored in order of levels, and when the own station level is higher than the degradation level, the perch channel number of the maximum peripheral level is extracted from the permuted perch channel table, and the maximum peripheral level is lower than the degradation level. In the case where the maximum peripheral level is higher than the degradation level, the communication is continued when the zone transition determination condition is not satisfied, and when the maximum peripheral level is higher than the degradation level, the zone transition determination condition is satisfied. Is established, the perch channel number and the packet communication physical channel In the previous zone information table that stores the pertinent channel number and the contents of the zone zone information table that stores the perch channel number and the packet communication physical channel number of the zone where the zone is currently located, However, if the own station level is lower than the deterioration level, the permutation channel having a higher level than the deterioration level is searched in the level-ordered perch channel table, and the search result is present in the previous zone information table. In the previous zone information table, the storage content of the zone zone information table is set, the high-speed zone shift process is performed, and if the search result does not exist in the previous zone zone table,
A low-speed zone shift process is performed.

Since the basic functional configuration and the operation of the present invention have been described above, the level determination control unit according to the first and second embodiments of the present invention will be mainly described. Will be described in detail.

FIG. 5 is a flow chart for explaining the operation of the first embodiment of the present invention, and also shows a per-level perch channel table and a peripheral zone information table. Hereinafter, the operation of the first embodiment of the present invention will be described along the reference numerals in FIG.

S1. The packet communication state control unit receives the measurement result of the reception level of the perch channel.

S2. The received reception level measurement results are sorted in order of level, and written to the level-order perch channel table.

The order of writing may be from the higher level or from the lower level. However, since the possibility of use is high for the perch channel having the higher reception level, it is preferable to arrange the channels from the higher level. .

S3. The level determination control unit determines whether the own station level is higher than the deterioration level.

S4. In step S3, when it is determined that the own station level is lower than the deterioration level (No), a perch channel of a level at which packet communication is possible is searched by the level-ordered perch channel table.

S5. It is determined whether the searched perch channel exists in the peripheral zone information table.

S6. If it is determined in step S5 that the searched perch channel does not exist in the peripheral zone information table (No), the peripheral zone information table is initialized, and S7. Packet communication control channel (in the figure,
Abbreviated as “PKT communication control CH”. In the drawings, the same description may be used. ) To perform the low-speed zone shift processing.

S8. On the other hand, if it is determined in step S5 that the searched perch channel exists in the peripheral zone information table (Yes), the information of the packet communication enabled perch channel stored in the peripheral zone information table is changed. Set in the visited zone information table.

S9. If it is determined in step S3 that the own station level is higher than the deterioration level (Yes),
The number of the perch channel having the highest reception level is extracted from the level-order perch channel table.

S10. It is determined whether or not the maximum peripheral level of the perch channel extracted in step S9 is higher than the degradation level.

If it is determined that the maximum peripheral level is lower than the degradation level (No), the communication is continued without shifting to a zone because the own station level is higher than the degradation level and the maximum peripheral level is lower than the degradation level. I do.

S11. On the other hand, when it is determined in step S10 that the maximum peripheral level is higher than the deterioration level (Ye
In s), the number of the perch channel stored in the peripheral zone information table is extracted.

S12. It is determined whether or not the number of the perch channel extracted in step S9 is included in the number of the perch channel extracted in step S11.

S13. In step S12, step S9
The number of the perch channel extracted at step S
If it is determined that the number is not included in the number extracted in step 11 (No), the zone information acquisition unit is activated to acquire the zone information, and S14. The acquired zone information is stored in the peripheral zone information table.

S15. In step S12, step S9
The number of the perch channel extracted at step S
If it is determined that the number is included in the number extracted in step S11 (Yes), the number of the perch channel extracted in step S9 is determined in step S12 in step S11.
Is determined not to be included in the number extracted at (N
o), new zone information is obtained in step S13,
If it is stored in the peripheral zone information table in step S14, a zone shift determination is made.

Here, if the maximum value of the peripheral level is not higher than the sum of the difference between the own station level and the strong electric field determination level, or if the maximum value of the peripheral level is not higher than the sum of the difference between the own station level and the connection permission level, It is determined that communication will be continued.

If the maximum value of the peripheral level is higher than the sum of the difference between the local station level and the strong electric field determination level, or if the maximum value of the peripheral level is higher than the sum of the local station level and the connection permission level difference, the process proceeds to step S16. Transition.

S16. If the zone transition condition is satisfied in step S15 (Yes), the number of the perch channel at the maximum peripheral level is acquired from the peripheral zone information table.

S17. The information of the obtained perch channel of the maximum peripheral level is set in the peripheral zone information table.

S18. After the processing of step S8 or the processing of step S17 is completed, the peripheral zone information table is initialized, and S19. Activate the packet communication physical channel selection unit,
The high-speed zone shift processing is performed.

Here, the reason why the peripheral zone information table is initialized in step S18 is that the perch channels of the adjacent zones cannot be taken over after the zone transfer due to the standard that duplication is not allowed.

By the above-described level determination control, peripheral zone information is acquired in advance and stored in the peripheral zone information table, and zone transition determination is performed with reference to the peripheral zone information table. It is possible to avoid prolonging zone transfer due to acquisition failure.

In FIG. 5, it is described that the determination of the satisfaction of the zone shift determination condition is performed after storing the acquired zone information in the peripheral zone information table (step S14). Immediately after the determination (step S10), it may be determined whether the zone shift determination condition is satisfied.

FIG. 6 is a diagram for explaining the operation of the first embodiment of the present invention, and also shows the first problem of the conventional zone shift.

In FIG. 6, reference numeral 101 denotes a base station installed at point A, 102 denotes a base station installed at point B, 103 denotes a zone A under the base station 101, and 104 denotes a zone B under the base station 102. , 105 are mobile stations moving from zone A to zone B while performing packet communication.

FIG. 6 also shows how the detected reception level changes depending on the location.

The mobile station during packet communication uses the empty time slot to receive the reception level of the packet communication physical channel in the visited zone, that is, its own station level, and the control physical station preset in the base station in the peripheral zone. The reception level of the perch channel, that is, the peripheral level is measured, and the zone transition is determined based on the relationship between the local station level, the peripheral level, and the designated level, and the zone transition is performed if necessary.

In the conventional zone transfer, a zone information request signal is transmitted at a point satisfying the zone transfer condition as shown by a thin broken line in FIG. 6, so that the zone information request signal does not reach the base station, There is a high possibility that the zone information notification signal from the server cannot be normally received.

On the other hand, in the first embodiment of the present invention, the mobile station acquires the information of the zone to which the mobile station can shift at the point where the detection level is high, and holds the acquired zone information. Then, when the zone transfer condition specified by the base station is cleared, switching to a new packet communication physical channel is performed directly, so that a delay in zone transfer due to failure in zone information acquisition can be avoided.

FIG. 7 is a flowchart for explaining the operation of the second embodiment of the present invention, and also shows a per-level perch channel table and a previous zone information table. Hereinafter, the operation of the second embodiment of the present invention will be described along the reference numerals in FIG.

S31. The packet communication state control unit receives the measurement result of the reception level of the perch channel.

S32. The received reception level measurement results are sorted in order of level, and written to the level-order perch channel table.

The order of writing may be from the higher level or from the lower level, but it is preferable to arrange from the higher level because the possibility of use is the perch channel with the higher reception level. .

S33. It is determined whether the own station level is higher than the deterioration level level.

S34. If it is determined in step S33 that the own station level is lower than the deterioration level (No), a perch channel of a level that allows packet communication is searched for in the level order perch channel table.

S35. It is determined whether or not the searched perch channel exists in the previous zone information table.

S36. If it is determined in step S35 that the searched perch channel does not exist in the last visited zone information table (No), the last visited zone information table is initialized, and S37. Activate the packet communication control channel selector and
A low-speed zone shift process is performed.

S38. On the other hand, if it is determined in step S35 that the searched perch channel is present in the previous zone information table (Yes), the storage contents of the current zone information table and the previous zone information table are exchanged. .

S39. If it is determined in step S33 that the own station level is higher than the deterioration level (Yes), the perch channel number having the largest peripheral level is extracted from the level-order perch channel table.

S40. It is determined whether or not the maximum peripheral level of the extracted perch channel is higher than the degradation level.

When it is determined that the maximum peripheral level of the extracted perch channel is lower than the deterioration level (No), the local station level is capable of packet communication, the maximum peripheral level is not packet communication, and the zone shift is performed. Since there is no need for communication, communication is continued without performing zone transfer.

S41. In step S40, when it is determined that the maximum peripheral level of the extracted perch channel is higher than the degradation level (Yes), it is determined whether or not a zone shift determination condition is satisfied.

Here, if the maximum value of the peripheral level is not higher than the sum of the difference between the own station level and the strong electric field determination level, or if the maximum value of the peripheral level is not higher than the sum of the difference between the own station level and the connection permission level, , The zone shift determination condition is not satisfied (N
o), it is determined that communication is to be continued.

If the maximum value of the peripheral level is higher than the sum of the difference between the own station level and the strong electric field determination level, or if the maximum value of the peripheral level is higher than the sum of the difference between the own station level and the connection permission level, the zone shift is performed. The determination condition is satisfied (Yes), and the routine goes to Step S42.

S42. If it is determined in step S41 that the zone shift determination condition is satisfied (Yes), it is determined whether or not the number of the perch channel extracted in step S39 is present in the previous zone information table.

S43. In step S42, step S3
When it is determined that the number of the perch channel extracted in step 9 is present in the previous zone information table (Yes)
As shown in the right side of FIG. 7, the stored contents of the visited zone information table and the previous visited zone information table are exchanged.

S44. On the other hand, if it is determined in step S42 that the number of the perch channel extracted in step S39 does not exist in the last visited zone information table (No), the information is obtained from the last visited zone information table from the visited zone information table. Set in the information table.

S45. Activate the zone information acquisition unit to acquire zone information.

S46. The zone information acquired in step S45 is registered in the visited zone information table.

S47. Then, when any of the processes in step S38, step S43, or step S46 is completed, the packet communication physical channel is activated, and the high-speed zone shift process is performed.

As a result, the zone information is not obtained for the perch channel stored in the zone information table in the previous time. Therefore, even when the zone transition is repeated due to unstable reception level, the zone information is not obtained. Thus, it is possible to avoid an increase in the processing load of the base station and a decrease in the throughput of the packet communication of the mobile station without repeating the acquisition of the base station.

FIG. 8 is a diagram for explaining the operation of the second embodiment of the present invention.

In FIG. 8, reference numeral 101 denotes a base station installed at a point A, 102 denotes a base station installed at a point B, 103 denotes a zone A under the base station 101, and 104 denotes a zone B under the base station 102. , 105 are mobile stations moving from zone A to zone B while performing packet communication.

FIG. 8 also shows how the detected reception level changes depending on the location.

The mobile station during packet communication uses the empty time slot to receive the reception level of the packet communication physical channel in the visited zone, that is, its own station level, and the control physical station preset in the base station in the peripheral zone. The reception level of the perch channel, that is, the peripheral level is measured, and the zone transition is determined based on the relationship between the local station level, the peripheral level, and the designated level, and the zone transition is performed if necessary.

Here, the mobile station initially performs packet communication with the base station at point A, and moves at a low speed near the middle point between the base station at point A and the base station at point B, or stops. It is assumed that

At this time, information on the base station at the zone transfer destination is once obtained with the base station at point A, and switching to the base station at point B is performed.

Thereafter, when the reception level becomes unstable and it becomes necessary to switch to the base station at point A again,
By referring to the visited zone information table and the previous visited zone information table, there is no need to obtain new zone information from the base station at the point B. If the reception level remains unstable, hunting may be performed, but there is no need to obtain zone information from any base station each time.

Therefore, the processing load on the base station can be reduced.

FIG. 9 is a flowchart for explaining the operation of the third embodiment of the present invention. In particular, although a configuration diagram of the third embodiment is not shown, a level determination control unit having both the function of the level determination control unit in the first embodiment and the function of the level determination control unit in the second embodiment The third embodiment of the present invention is provided with a control memory having both a peripheral zone information table and a previous zone information table.

[0200] The zone transfer operation combining the functions of the first embodiment and the second embodiment of the present invention will be described below along the reference numerals in FIG.

S51. The packet communication state control unit receives the measurement result of the reception level of the perch channel.

S52. The received reception level measurement results are sorted in order of level, and written to the level-order perch channel table.

The order of writing may be from the higher level or from the lower level, but it is preferable to arrange from the higher level because the possibility of use is the perch channel with the higher reception level. .

S53. It is determined whether the own station level is higher than the deterioration level.

S54. If it is determined in step S53 that the own station level is lower than the degradation level (No), a perch channel having a level higher than the degradation level is searched by using the level-ordered perch channel table.

S55. It is determined whether or not the perch channel information retrieved in step S54 is present in the previous zone information table.

S56. If it is determined in step S55 that the search result did not previously exist in the visited zone information table (No), it is determined whether the search result in step S54 exists in the peripheral zone information table.

S57. In step S56, step S5
If it is determined that the search result in No. 4 does not exist in the peripheral zone information table (No), the peripheral zone information table is initialized, and S58. Previously, the zone information table was initialized, and S59. Activate the packet communication control channel selector and
A low-speed zone shift process is performed.

S60. On the other hand, in step S55, when it is determined that the search result is present in the last time zone information table (Yes), the storage contents of the last time zone information table and the last time zone information table are exchanged.

S61. When it is determined in step S53 that the own station level is higher than the deterioration level (Yes).
, The perch channel number having the highest peripheral level is extracted from the level-ordered perch channel table.

S62. It is determined whether or not the peripheral level of the perch channel of the maximum peripheral level extracted in step S61 is higher than the degradation level.

If it is determined that the maximum peripheral level is lower than the deterioration level (No), the local station level is higher than the deterioration level and the maximum peripheral level is lower than the deterioration level, so that there is no point in performing zone transfer. Therefore, the communication is continued.

S63. If it is determined in step S62 that the maximum peripheral level is higher than the deterioration level (Yes), the perch channel number stored in the peripheral zone information table is extracted.

S64. It is determined whether or not the number of the perch channel extracted in step S61 is included in the number of the perch channel extracted in step S63.

S65. In step S64, step S6
The number of the perch channel extracted in step 1 is
If it is determined that it is not included in the number of the perch channel extracted in 63 (No), the zone information acquisition unit is activated to acquire zone information.

S66. The acquired zone information is stored in the peripheral zone information table.

S67. In step S64, step S6
The perch channel number extracted in step 1 is determined in step S6.
If it is determined that the perch channel number is included in the perch channel number extracted in step 3 (Yes), when the process of step S66 ends, it is determined whether or not the zone shift condition is satisfied.

Here, when the maximum value of the peripheral level is not higher than the sum of the difference between the own station level and the strong electric field determination level, or when the maximum value of the peripheral level is not higher than the sum of the difference between the own station level and the connection permission level, The zone shift determination condition is not satisfied (No)
Therefore, it is determined that the communication is continued.

If the maximum value of the peripheral level is higher than the sum of the difference between the own station level and the strong electric field determination level, or if the maximum value of the peripheral level is higher than the sum of the difference between the own station level and the connection permission level, the zone transfer is determined. Assuming that the condition is satisfied (Yes),
Jump to step S69.

S68. If the zone shift determination condition is satisfied in step S67 (Yes), it is determined whether or not the number of the perch channel extracted in step S61 exists in the previous zone information table.

S69. In step S68, step S6
When it is determined that the number of the perch channel extracted in step 1 is present in the previous zone information table (Yes)
In, the stored contents of the visited zone information table and the stored contents of the previous visited zone information table are exchanged.

S70. In step S68, step S6
If it is determined that the number of the perch channel of the maximum peripheral level extracted in step 1 does not exist in the visited information table last time (No), the stored content of the visited zone information table is stored in the previous visited zone information table. Set.

S71. The number of the perch channel at the maximum peripheral level is obtained from the peripheral zone information table.

S72. The number of the perch channel of the maximum peripheral level acquired in step S71 is set in the visited zone information table.

S73. On the other hand, if it is determined in step S56 that the search result in step S55 exists in the peripheral zone information table (Yes), the storage content of the visited zone information table is set in the previous visited zone information table, and S74 is performed. . The storage contents of the peripheral zone information table are set in the visited zone information table.

S75. When the processing in step S60 is completed or when the processing in step S74 is completed, the storage contents of the peripheral zone information table are initialized.

S76. Activate the packet communication physical channel selection unit to perform high-speed zone transfer processing.

As described above, the zone transfer processing operation according to the third embodiment of the present invention is performed.

Then, by the above-described level determination control, the peripheral zone information is acquired in advance and stored in the peripheral zone information table, and the zone shift determination is performed with reference to the peripheral zone information table. In addition to avoiding prolonged zone transition due to failure in zone information acquisition, zone information is not acquired for the perch channel previously stored in the visited zone information table. Even if the zone transition is repeated for stability, the acquisition of zone information is not repeated,
It is possible to avoid an increase in the processing load of the base station and a decrease in the throughput of packet communication of the mobile station.

In FIG. 9, the determination as to whether or not the zone shift determination condition is satisfied is made after step S67. However, the determination of the level of the peripheral level and the deterioration level (the zone shift determination condition immediately after step S63) is performed. The same function as in FIG. 9 can be realized by determining whether or not the condition is satisfied.

[0231]

According to the first means of the present invention, the peripheral zone information is acquired in advance and stored in the peripheral zone information table, and the zone shift determination is performed with reference to the peripheral zone information table. It is possible to avoid a prolonged zone shift due to a failure in zone information acquisition in the zone.

According to the second means of the present invention, zone information is not obtained for a perch channel previously stored in the visited zone information table. Is repeated, it is possible to avoid an increase in the processing load of the base station and a decrease in the throughput of the packet communication of the mobile station without repeating the acquisition of the zone information.

Further, the first means and the second means of the present invention can be combined, and by combining the first means and the second means of the present invention, zone information acquisition in the zone in which the terminal device is located can be performed. In addition to avoiding prolonged zone transition due to the failure of the zone, even when the zone transition is repeated due to unstable reception level, the acquisition of zone information is not repeated, and the processing load on the base station increases. It is possible to avoid a decrease in the throughput of mobile station packet communication.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention.

FIG. 2 is a configuration example of a peripheral zone information table.

FIG. 3 shows a second embodiment of the present invention.

FIG. 4 is a configuration example of a previous zone information table.

FIG. 5 shows the operation of the first embodiment of the present invention.

FIG. 6 is a view for explaining the operation of the first embodiment of the present invention.

FIG. 7 shows the operation of the second embodiment of the present invention.

FIG. 8 is a diagram for explaining the operation of the second embodiment of the present invention.

FIG. 9 shows the operation of the third embodiment of the present invention.

FIG. 10 is a functional configuration of a conventional wireless control unit.

FIG. 11 is a configuration example of a perch channel table.

FIG. 12 is a configuration example of a per-level perch channel table.

FIG. 13 is a configuration example of a visited zone information table.

FIG. 14 shows the operation of the packet communication state control unit.

FIG. 15 shows the operation of a zone information acquisition unit.

FIG. 16 shows the operation of the packet communication physical channel selection unit.

FIG. 17 shows the operation of the packet communication control channel selector.

FIG. 18 shows a conventional zone shift determination condition.

FIG. 19 is a diagram (part 1) for explaining a problem of a conventional zone shift.

FIG. 20 is a diagram (part 2) for explaining a problem of a conventional zone shift.

FIG. 21 is a conceptual diagram of a zone shift of packet communication in a personal digital cellular system.

FIG. 22 shows a configuration of a logical channel of the personal digital cellular system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless control unit 1a wireless control unit 1b wireless control unit 2 packet communication control unit 2a packet communication control unit 2b packet communication control unit 3 control memory 3a control memory 3b control memory 4 level measuring device 11 standby state control unit 12 voice Communication control unit 21 Packet communication state control unit 22 Level judgment control unit 22a Level judgment control unit 22b Level judgment control unit 23 Zone information acquisition unit 24 Packet communication control channel selection unit 25 Packet communication physical channel selection unit 31 Perch channel table 32 Permuted perch channel table 33 Level zone information table 34 Peripheral zone information table 35 Previous level zone information table 101 Base station at point A 102 Base station at point B 103 Zone A 104 Zone B 105 Mobile station

Continuation of the front page (72) Inventor Hidenori Konno 1-5-1, Shimonopporo Techno Park, Atsetsu-ku, Sapporo, Hokkaido Inside Fujitsu Hokkaido Communication Systems Co., Ltd. (72) Inventor Tetsuya Murata 1-1-5 Shimonopporo Techno Park, Atsubetsu-ku, Sapporo, Hokkaido Fujitsu Hokkaido Communication Systems Co., Ltd. (72) Inventor Eriko Funamoto 1-5-1, Shimonopporo Techno Park, Atsubetsu-ku, Sapporo, Hokkaido Fujitsu Hokkaido Communication Systems Co., Ltd. (72) Hiroshi Karasawa 1-1, Shimonopporo Techno Park, Atsubetsu-ku, Sapporo, Hokkaido No. 5 Fujitsu Hokkaido Communication System Co., Ltd. F term (reference) 5K030 GA02 GA11 HA08 HC01 HC09 JL01 JT09 LB09 MA01 MB01 5K067 AA13 BB03 CC08 DD36 EE02 EE10 EE32 FF03 FF16 HH07 HH22 HH23 JJ03 JJ12 JJ39 JJ65 JJ70 JJ70

Claims (3)

[Claims] 1. A zone transfer method in packet communication by a personal digital cellular system, wherein a perch channel number and a detection reception level are stored in a level order perch channel table in order of level. The perch channel number of the peripheral zone and the corresponding packet communication physical channel number are stored in the zone information table. If the own station level is higher than the deterioration level, the perimeter of the permutation perch channel table is higher. The perch channel number with the highest level is extracted, and if the maximum peripheral level is lower than the degradation level, communication is continued without performing zone transition.If the maximum peripheral level is higher than the degradation level, the zone transition determination condition is satisfied. If not, continue communication, and if the maximum peripheral level is higher than the degradation level, If the zone shift determination condition is satisfied, the number of the perch channel of the maximum peripheral level is extracted from the peripheral zone information table, and the perch channel number of the zone in which the mobile station is located and the perch channel number If the own station level is lower than the deterioration level, the level is determined by the permuted perch channel table when the high-speed zone transfer processing is performed by setting the number in the visited zone information table storing the number of the packet communication physical channel corresponding to If a search result is found in the peripheral zone information table, the information obtained from the peripheral zone information table is stored in the serving zone information table, and the high-speed zone is searched. After performing the transition process, if the search result does not exist in the peripheral zone information table, Zone migration method in a packet communication by a personal digital cellular system and performing management. 2. A zone shift method in packet communication by a personal digital cellular system, wherein a perch channel number and a detection reception level are stored in a level order perch channel table in order of level. The serving zone information table stores the perch channel number of the zone where the serving area was last located and the corresponding packet communication physical channel number. If the own station level is higher than the deterioration level, the permutation of the level order perch is performed. The perch channel number of the maximum peripheral level is extracted from the channel table, and when the maximum peripheral level is lower than the degradation level, and when the maximum peripheral level is higher than the degradation level, and the zone transition determination condition is not satisfied, If communication is continued and the maximum peripheral level is higher than the degradation level, If the zone shift determination condition is satisfied, the previous location information table storing the perch channel number and the packet communication physical channel number of the zone where the zone was previously located,
Set the contents of the visited zone information table that stores the perch channel number and the packet communication physical channel number of the zone where the current zone is located, perform high-speed zone transfer processing, and if the own station level is lower than the degradation level In the level-ordered perch channel table, a perch channel having a higher level than the degradation level is searched, and if a search result is present in the previous zone information table, the permutation is added to the previous zone information table. The personal computer characterized in that the storage contents of the visited zone information table are set and high-speed zone transfer processing is performed, and if a search result does not exist in the previous visited zone information table, low-speed zone transfer processing is performed. Zone transfer method in packet communication by digital cellular system. 3. A zone transfer method in packet communication by a personal digital cellular system, wherein a perch channel number and a detection reception level are stored in a level order perch channel table in order of level. The perch channel number of the peripheral zone and the corresponding packet communication physical channel number are stored in the zone information table, and the perch channel number of the zone in which the zone was previously located is stored in the last zone information table. If the own station level is higher than the degradation level, the perch channel number of the maximum peripheral level is extracted from the permuted perch channel table, and the maximum peripheral level is degraded. When the level is lower than the level, communication is continued and the maximum peripheral level is degraded. If it is higher, the satisfaction of the zone shift determination condition is examined with reference to the surrounding zone information table. If the zone shift determination condition is not satisfied, the communication is continued. If the zone shift determination condition is satisfied, the communication is continued. Performs high-speed zone transfer processing with reference to the previous zone information table. If the own station level is lower than the deterioration level, a search is performed for a perch channel of a peripheral level capable of packet communication. When it exists in the information table, the high-speed zone transfer processing is performed. When the search result does not exist in the previous zone information table, when the search result exists in the peripheral zone information table, the high-speed zone transfer processing is performed. When the information does not exist in the table and does not exist in the peripheral zone information table, the low-speed zone shift processing is performed. Zone migration method in a packet communication by a personal digital cellular system.