JP3436194B2 - Connection management apparatus and method in wireless communication system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION In a wireless communication system for performing communication between a base station and a mobile station in an ATM (Asynchronous Transfer Mode), the ATM connection between the base station and the mobile station is collectively set / released by hardware. The present invention relates to a connection management device and method in a wireless communication system.

[0002]

2. Description of the Related Art In a radio communication system in which communication between a base station and a mobile station is performed by ATM, when a mobile station moves between radio zones and a handover occurs,
As an ATM connection management of a base station that communicates with a plurality of mobile stations, all the ATM connections of the base station before switching and the mobile station that has moved in the wireless zone are released, and the ATM of the base station after switching and the ATM of the above mobile station. You need to set a new connection.

Also, a plurality of ATMs can be simultaneously used in a mobile station.
When switching connections, each ATM
It is necessary to set / release the connection. Furthermore, A
During the update of the TM connection, it is necessary to stop the output of invalid ATM cells in order to prevent the malfunction of the system.

In the header conversion unit of the ATM switch, it is necessary to set the header conversion table every time there is a request for setting / releasing a connection from the control unit.
As seen in 53987, "ATM switch and system using it", redundancy is added to the configuration
The load on the control unit is lightened by reducing the frequency of setting / releasing TM connections and simplifying the processing. However, many setting / releasing of ATM connections are performed every time a handover occurs. It is difficult to apply the above-mentioned ATM switching technology to the header conversion unit of the base station that needs to be executed quickly.

In addition, when the ATM connection is set / released one by one by the control unit of the base station, the processing time becomes long and the control unit of the base station becomes heavy. As a result, the load of handover processing becomes heavy.

In Japanese Patent Application No. 10-352821 "Connection management method and method for wireless communication system", ATM connection can be set / released collectively for each mobile station by hardware.

[0007]

However, since there is no means for setting / releasing the ATM connection with the mobile station in units of groups, it is necessary to individually perform the setting / releasing of a plurality of ATM connections at the same time. Therefore, the control unit of the base station is burdened similarly to the handover process. Also, since it does not have the function of stopping the transmission of invalid ATM cells while updating the ATM connection,
It may cause malfunction.

Therefore, in order to solve the above problems, the present invention sets / releases an ATM connection with a mobile station in group units in a wireless communication system in which communication between a base station and a mobile station is performed by ATM. An object of the present invention is to provide a connection management device and method in a wireless communication system that stops the transmission of invalid ATM cells while updating an ATM connection.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a wireless communication system in which communication between a base station and a mobile station is performed by ATM, and a mobile station and an ATM cell are transmitted and received within a wireless zone. A base station that stores a mobile station number for identifying a mobile station existing in the same radio zone and a group number for further finely classifying an ATM connection with the mobile station; When a station moves from a wireless zone to another wireless zone to cause a handover , the ATM connection for each mobile station is set / released collectively by hardware based on the data in the associative memory.
A mobile station can simultaneously connect to multiple ATMs in the same wireless zone.
When switching the application, the data in the associative memory
Based on the ATM connection of the unit of the group
The setting / release and having a row Cormorant header converting section collectively by hardware.

With the above configuration, a plurality of A's with the mobile station
When the TM connections are switched at the same time, as the ATM connection management of the base station that communicates with a plurality of mobile stations, the setting / release of the ATM connections of the base station and the mobile stations are collectively performed by hardware in units of groups.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the configurations of a base station control unit, a base station, and a mobile station in a wireless communication system. When a handover occurs due to the mobile station 3a moving from the wireless zone 4a to the wireless zone 4b, in order to maintain communication between the base station and the mobile station, the base station 2a and the mobile station 3 are maintained.
All ATM connections between a and a are released and an ATM connection between the base station 2b and the mobile station 3a is set. Further, when the mobile station 3b simultaneously switches a plurality of connections within the wireless zone 4a, the ATM connection between the base station 2a and the mobile station 3b is set / released. Although it is necessary to manage the ATM connection in the base station and the mobile station respectively, the connection management on the base station side will be described in the present invention.

FIG. 2 shows the configuration of the base station in the wireless communication system. The base station is a radio transmitter / receiver 10 and a modulator / demodulator 1
1, radio frame processing unit 12, header conversion unit 13, AT
The M cell transmission / reception unit 14 and the control unit 15 are provided. The control unit 15 controls the radio transmission / reception unit 10, the modulation / demodulation unit 11, the radio frame processing unit 12, the header conversion unit 13, and the ATM cell transmission / reception unit 14, respectively. Have. In particular,
It has a function of instructing the header conversion unit 13 to set / release an ATM connection.

FIG. 3 shows a unidirectional structure of the upstream / downstream of the header converter 13 for managing the ATM connection and replacing the header of the ATM cell. However, the header converting unit 13 has a function of replacing the header of the input ATM cell, a function of setting an ATM connection, and a function of releasing the ATM connection.

The header extraction unit 20 is a VPI which is a connection identifier of the input ATM cell 30 input from the preceding stage.
(Virtual Path Identifier) / VCI (Virtual Channel
Identifier) 41 is extracted and output to the header conversion control unit 22, and the ATM cell 40 is output to the header adding unit 21.

The header converting memory 23 is a new VPI / VCI which is the VPI / VCI after the header conversion and connection data (for example, QoS information, route information, etc.).
Is a memory for storing for each connection. The structure of the header conversion memory 23 is shown in FIG.

The connection data is information that can be set for each connection in order to realize various functions in the base station, and QoS (Quality of Se) for guaranteeing quality.
rvice) information and signaling cells and OAM (Operation
And maintenance) Route information for demultiplexing / multiplexing cells etc. can be considered. As the memory capacity, it is sufficient to prepare only the maximum allowable number of connections in the system. When the memory write request 42 is input from the header conversion control unit 22, writing is performed to the memory address 44 of the header conversion memory 23. When the memory read request 43 is input, the memory address 44 of the header conversion memory 23 is read, and the new VPI / VCI 49 and the connection data 50 are output to the header adding unit 21.

The connection management CAM 24 is an ATM.
A 1-bit setting bit indicating whether or not the connection is registered, a mobile station number for identifying a mobile station existing in the same wireless zone, a group number for further classifying ATM connections with the mobile station, and an ATM connection. It is a CAM (associative memory) that stores the registered VPI / VCI for each connection. Setting bit is 0
The case means that the connection has not been registered, and the case where 1 means that the connection has been registered. CA for connection management
The structure of M24 is shown in FIG.

As the capacity of the CAM, it is sufficient to prepare only the maximum allowable number of connections in the system. When the CAM search request 45 is input from the header conversion control unit 22, the data stored in the connection management CAM 24 and the CA
All words are compared with the search data included in the M search request 45. If a word having stored data that matches the search data exists, the address of the word is sent to the header conversion control unit 22 as the matching address 47.
And a match signal 48 indicating that the search data and the stored data match. However, if there are a plurality of words that match the search data, the word with the smallest address value in the connection management CAM 24 is selected. When the CAM write request 46 is input, writing is performed to the designated address of the connection management CAM 24.

The header adder 21 is connected to the V of the ATM cell 40.
The PI / VCI is replaced with the new VPI / VCI 49 acquired from the header conversion memory 23, and the output ATM cell 31
And output to the latter stage. Further, if necessary, it has a function of outputting the connection data 50 acquired from the header conversion memory 23 to the subsequent stage. However, when the mobile station number 51 and the header conversion stop signal 52 indicating that the ATM connection is being updated are input from the header conversion control unit 22, all ATMs that perform transmission / reception with the mobile station indicated by the mobile station number 51. The replacement of the cell header is stopped, and the transmission of the output ATM cell 31 is stopped. It is also possible to notify the preceding stage of the header conversion unit 13 that the transmission of the ATM cell transmitted / received with the mobile station indicated by the mobile station number 51 is stopped.

The header conversion control unit 22 includes a header extraction unit 2
VPI / VCI 41 from 0, connection setting request 3
2, connection release request 33, connection management C
A match address 47 and a match signal 48 from the AM 24 are input, and a memory write request 42 to the header conversion memory 23, a memory read request 43 and a memory address 44, a CAM search request 45 to the connection management CAM 24, and a CAM write request 46. , The mobile station number 51 and the header conversion stop signal 52 to the header adding unit 21.
Is output. The structure of the header conversion control unit 22 is shown in FIG. The header conversion control unit 22 includes the header read control unit 1
00, connection setting control unit 101, connection release control unit 102, address generation unit 103, selector 10
4, 105, 106 and 107.

The selector 104 has a valid signal among the CAM search request A, the CAM search request B, and the CAM search request C output from the header read control unit 100, the connection setting control unit 101, and the connection release control unit 102, respectively. If so, the signal is output as the CAM search request 45. If all the signals are invalid, the CAM search request 45 is not output. The selector 105 includes a connection setting control unit 101 and a connection release control unit 102.
CAM write requests B and CAM respectively output by
If there is a valid signal in the write request C, that signal is output as the CAM write request 46, and if all are invalid signals, the CAM write request 46 is not output. The selector 106 includes the connection setting control unit 10
1. If there is a valid signal of the mobile station number B and the mobile station number C respectively output from the connection release control unit 102, that signal is output as the mobile station number 51, and if all are invalid signals The mobile station number 51 is not output. The selector 107 includes the connection setting control unit 10
1. If a valid signal exists among the header conversion stop signal B and the header conversion stop signal C output from the connection release control unit 102, respectively, that signal is output as the header conversion stop signal 52, and all are invalid signals. If so, the header conversion stop signal 52 is not output.

In the header read control unit 100, the input A
Every time the VPI / VCI 41 extracted from the TM cell 30 is input, the converted header is read out from the header conversion memory 23. Header read control unit 100
When the mobile station number 51 and the header conversion stop signal 52 indicating that the ATM connection is being updated are not input, and the VPI / VCI 41 is input from the header extraction unit 20, C is issued to the connection management CAM 24.
The AM search request A and the CAM search request 45 are output, and if there is a word that matches the search data, a match signal 48.
And a function of reading the header conversion memory 23 by a memory read request 43.

The connection setting control unit 101 sets an ATM connection according to an instruction from the control unit 15.
When the connection setting request 32 is input, the connection setting control unit 101 receives the connection management CAM.
24, a CAM search request B and a CAM search request 45, and a function of acquiring a match signal 48 when a word matching the search data exists, and a CAM write request B to the connection management CAM 24. The function of writing by the CAM write request 46, the function of writing by the memory write request 42 to the header conversion memory 23, the mobile station number 51 indicating that the ATM connection is being updated, and the header conversion stop signal 52. Has the function of outputting.

The connection release controller 102 releases the ATM connection according to an instruction from the controller 15.
When the connection release request 33 is input, the connection release control unit 102 receives the connection management CAM.
24, a CAM search request C and a CAM search request 45 are output, and a match signal 48 is acquired when a word matching the search data exists, and a CAM write request C to the connection management CAM 24. It has a function of writing by the CAM write request 46 and a function of outputting the mobile station number 51 and the header conversion stop signal 52 indicating that the ATM connection is being updated.

The address generator 103 generates an address for accessing the header conversion memory 23. The address generation unit 103 is a connection management CA.
It has a function of acquiring a match address 47 output when the search data and the stored data match from M24, generating a memory address 44 from the address, and outputting the memory address 44 to the header conversion memory 23. Header conversion memory 23
Memory address 44 and CAM 24 for connection management
The address generation unit 103 needs to generate the memory address 44 so that the coincident address 47 of 1 corresponds to each connection on a one-to-one basis.

Next, the operation of this embodiment will be described.

Header conversion unit 1 for managing the ATM connection in the base station and replacing the header of the ATM cell
3 has an ATM cell header replacement function, an ATM connection setting function, and an ATM connection release function.

When the mobile station 3a of FIG. 1 moves from the wireless zone 4a to the wireless zone 4b and a handover occurs, all ATM connections between the base station 2a and the mobile station 3a are released, and the base station 2b is released. It is necessary to set up an ATM connection between the mobile station and the mobile station 3a, and the setting / release of the ATM connection for each mobile station is collectively performed by hardware.

When the mobile station 3b simultaneously switches a plurality of ATM connections within the wireless zone 4a, it is necessary to set / release a plurality of the ATM connections between the base station 2a and the mobile station 3b. The ATM connections can be collectively set / released by the hardware, and the ATM connection in the mobile station can be added to or deleted from the group.

The mobile station 3b has one A within the wireless zone 4a.
When switching the TM connection, the setting / setting of one ATM connection between the base station 2a and the mobile station 3b is performed.
It is necessary to release the ATM connection, and the ATM connection in the mobile station can be individually added or deleted from the group.

Each operation will be described below.

First, the ATM cell header replacement function will be described.

The operation of the ATM cell header replacement function is summarized in FIG. As shown in FIG. 3, the input ATM cell 30
Is input to the header extraction unit 20 from the previous stage, the header extraction unit 20 extracts the VPI / VCI, outputs the VPI / VCI 41 to the header conversion control unit 22 (step 1), and outputs it to the header addition unit 21. On the other hand, the ATM cell 40 is output. As shown in FIG. 6, the header read control unit 100 of the header conversion control unit 22 does not input the mobile station number 51 and the header conversion stop signal 52 indicating that the ATM connection is being updated (step 2). V
The CAM search request A and the CAM search request 45 are output to the connection management CAM 24 using the PI / VCI and the setting bit = 1 as search data (step 3), and the AT
Check the registration status of M Connection. If the match signal 48 is output, that is, if the connection is already registered (step 4), the address generation unit 103 uses the memory address 44 generated from the match address 47 as the header conversion memory 2
3, and the header read control unit 100 outputs a memory read request to the header conversion memory 23 (step 5).

As shown in FIG. 3, the header conversion memory 2
The new VPI / VCI 49 and the connection data 50 read from No. 3 are output to the header adding unit 21. The header adding unit 21 uses the mobile station number 51 and the header conversion stop signal 5 indicating that the ATM connection is being updated.
When 2 is not input, the VPI / VCI of the ATM cell 40 input from the header extraction unit 20 is changed to the new VPI / VC.
It is replaced with I and output as the output ATM cell 31 in the subsequent stage. If necessary, the connection data is output to the subsequent stage.

Next, the ATM connection setting function (for each mobile station) will be described.

The operation of the ATM connection setting function for each mobile station is summarized in FIG. As shown in FIG. 6, when the connection setting request 32 for each mobile station is input (step 11), the connection setting control unit 101 receives the mobile station number B, the mobile station number 51, the header conversion stop signal B, and the header conversion. The stop signal 52 is output (step 12), and the connection management CA is used with the set bit = 0 as search data.
CAM search request B, CAM search request 45 to M24
Is output (step 14), and the CAM for connection management is output.
24 empty areas are detected. If the coincidence signal 48 is output, that is, if the connection can be set (step 15), the mobile station number, group number, and VPI / VCI are written to the address detected by the setting bit = 0 of the connection management CAM 24 (( Step 16).
The address generation unit 103 outputs the memory address 44 generated from the match address 47 to the header conversion memory 23, and the connection setting control unit 101 outputs a memory write request 42 to the header conversion memory 23, and the new V
PI / VCI and connection data are written (step 17). And the connection management CA
The setting bit = 1 is written to the address detected by the setting bit = 0 of M24 (step 18). Setting the setting bit = 1 means registering the connection. If there are more connections to configure,
The free bit of the connection management CAM 24 is detected again using the set bit = 0 as search data, and if the free space exists, the connection management CAM 24 and the header conversion memory 23 are set in the same manner. There are no connections to set, or a connection management CA
The above operation is repeated until there is no free space in M24 (step 13), and finally the output of mobile station number B, mobile station number 51 and header conversion stop signal B and header conversion stop signal 52 is stopped (step 19). .

By performing the above processing, it is possible to collectively set the ATM connection for each mobile station by hardware.

Next, the ATM connection release function (on a mobile station basis) will be described.

The operation of the ATM connection release function for each mobile station is summarized in FIG. As shown in FIG. 6, when the connection release request 33 for each mobile station is input (step 21), the connection release control unit 102 receives the mobile station number C, the mobile station number 51, the header conversion stop signal C, and the header conversion. The stop signal 52 is output (step 22), and the setting bit = 1 and the mobile station number are used as search data to the CAM 24 for connection management to request CAM search C, C.
The AM search request 45 is output (step 23), and the registration status of the ATM connection of the mobile station of the connection management CAM 24 is confirmed. When the coincidence signal 48 is output, that is, when there is at least one ATM connection to be released (step 24), the connection management CAM 2
Set bit = 1 for 4 and set bit = 0 is written in the address searched by the mobile station number (step 2
5). Setting the setting bit = 0 means canceling the registration of the connection. CAM for connection management using the setting bit = 1 and the mobile station number as search data again
The registration status of the ATM connection of the mobile station 24 is confirmed. Then, when the coincidence signal 48 is output, that is, when the ATM connection to be released still exists, the connection management CAM 24 is similarly set. The above operation is repeated until there are no more ATM connections to be released, and finally the output of the mobile station number C, the mobile station number 51, the header conversion stop signal C, and the header conversion stop signal 52 is stopped (step 26).

By performing the above processing, the ATM connection for each mobile station can be released collectively by hardware.

Next, the ATM connection setting function (group unit) will be described.

The operation of the ATM connection setting function for each group is summarized in FIG. As shown in FIG. 6, when the connection setting request 32 for each group is input (step 31), the connection setting control unit 101 uses the setting bit = 0 as the search data for the connection management C.
CAM search request B, CAM search request 4 to AM 24
5 is output (step 33), and the connection management CA is used.
The empty area of M24 is detected. If the coincidence signal 48 is output, that is, if the connection can be set (step 34), the mobile station number, group number, and VPI / VCI are written to the address detected by the setting bit = 0 of the connection management CAM 24 (( Step 3
5). The address generation unit 103 outputs the memory address 44 generated from the match address 47 to the header conversion memory 23, and the connection setting control unit 101 outputs a memory write request 42 to the header conversion memory 23.
The new VPI / VCI and connection data are written (step 36). Then, the setting bit = 1 is written to the address detected by the setting bit = 0 of the connection management CAM 24 (step 37). Setting the setting bit = 1 means registering the connection. If there is a connection to be set, the empty area of the connection management CAM 24 is detected again using the set bit = 0 as search data, and if there is a free area, the connection management CAM 24 and the header conversion memory 23 are searched. Make the same settings. The above operation is repeated until there are no connections to be set or there is no free area in the connection management CAM 24 (step 32).

By performing the above-described processing, it is possible to collectively set the ATM connection for each group by hardware, and it is possible to add the ATM connection in the mobile station to the group.

Next, the ATM connection release function (group unit) will be described.

The operation of the ATM connection release function for each group is summarized in FIG. As shown in FIG. 6, when the connection release request 33 for each group is input (step 41), the connection release control unit 102 uses the set bit = 1, the mobile station number and the group number as search data, and the connection management CAM 24. Against CA
The M search request C and the CAM search request 45 are output (step 42), and the A of the mobile station of the connection management CAM 24 is output.
Check the registration status of TM connection. Match signal 48
Is output, that is, if there is at least one ATM connection to be released (step 43), the setting bit = 1 for the connection management CAM 24, the setting bit = for the address searched by the mobile station number and the group number = Write 0 (step 44). Setting the setting bit = 0 means canceling the registration of the connection.
Again, the registration status of the ATM connection of the mobile station of the connection management CAM 24 is confirmed using the setting bit = 1, the mobile station number and the group number as search data. Then, the coincidence signal 48 is output, that is, the AT to be released
If M connections still exist, the connection management CAM 24 is similarly set. The above operation is repeated until there are no more ATM connections to release.

By performing the above processing, the ATM connections in groups can be collectively released by hardware, and the ATM connections in the mobile station can be deleted from the group.

Next, the ATM connection setting function (individual) will be described.

The operation of the individual ATM connection setting function is summarized in FIG. As shown in FIG. 6, the connection setting control unit 101 uses the individual connection setting request 32
Is input (step 51), the CAM search request B and the CAM search request 45 are output to the connection management CAM 24 using the set bit = 0 as search data (step 52), and the empty area of the connection management CAM 24 Detect. If the coincidence signal 48 is output, that is, if the connection can be set (step 53), the mobile station number, the group number, the VPI for the address detected by the setting bit = 0 of the connection management CAM 24.
/ VCI is written (step 54). The address generation unit 103 outputs the memory address 44 generated from the match address 47 to the header conversion memory 23, the connection setting control unit 101 outputs a memory write request 42 to the header conversion memory 23, and the new VPI / VCI. And write connection data (step 5)
5). Then, the setting bit = 1 is written to the address detected by the setting bit = 0 of the connection management CAM 24 (step 56). Setting the setting bit = 1 means registering the connection.

By performing the above processing, the ATM connection in the mobile station can be individually added to the group.

Next, the ATM connection release function (individual) will be described.

The operation of the individual ATM connection release function is summarized in FIG. As shown in FIG. 6, the connection release control unit 102 controls the individual connection release request 33.
Is input (step 61), the setting bit = 1, the mobile station number, and the VPI / VCI are used as search data for the CAM 24 for connection management and the CAM search request C, CA.
The M search request 45 is output (step 62), and the registration status of the ATM connection of the mobile station of the connection management CAM 24 is confirmed. If the coincidence signal 48 is output, that is, if there is at least one ATM connection to be released (step 63), the connection management CAM 24
Setting bit = 1, mobile station number and VPI / V
The setting bit = 0 is written in the address retrieved by CI (step 64). Setting the setting bit = 0 means canceling the registration of the connection.

By performing the above processing, it is possible to individually delete the ATM connection from the group in the mobile station.

Next, another embodiment of the present invention will be described.

As shown in FIG. 14, a connection management C
As the configuration of the AM 24, an intermediate address is added to the configuration shown in FIG. C for connection management CAM 24
When the search data matches the stored data when the AM search request 45 is output, the intermediate address of the stored data is output to the header conversion control unit 22 as the matching address 47, not the address of the connection management CAM 24. . A different value is set for each word as the intermediate address stored in the connection management CAM 24 so that the memory address 44 of the header conversion memory 23 and the matching address 47 of the connection management CAM 24 correspond to each other on a one-to-one basis for each connection. There is a need. Also, by rewriting the value of the intermediate address for each connection,
The address of the header conversion memory for storing the new VPI / VCI and connection data can be easily changed.

[0056]

As described above, according to the present invention, when a plurality of ATM connections with a mobile station are simultaneously switched in a wireless communication system in which communication between a base station and a mobile station is carried out by ATM, a plurality of mobile stations can be used. As the ATM connection management of the base station that communicates with the base station,
By collectively setting / releasing the TM connection in units of groups by hardware, the processing time for setting / releasing the ATM connection is shortened and the load on the control unit of the base station is reduced. In addition, by outputting a header conversion stop signal to the header attaching unit that replaces the ATM cell header, an invalid ATM is updated during the ATM connection update.
Stops cell output and prevents system malfunction.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a wireless communication system.

FIG. 2 is a diagram showing a configuration of a base station.

FIG. 3 is a diagram showing a configuration of a header conversion unit.

FIG. 4 is a diagram showing a configuration of a header conversion memory.

FIG. 5 is a diagram showing a configuration of a connection management CAM.

FIG. 6 is a diagram showing a configuration of a connection management CAM.

FIG. 7 is a flowchart showing an operation of an ATM cell header replacement function.

FIG. 8 is a flowchart showing the operation of an ATM connection setting function (for each mobile station).

FIG. 9 is a flowchart showing the operation of an ATM connection release function (by mobile station).

FIG. 10 is a flowchart showing an operation (group unit) of the ATM connection setting function.

FIG. 11 is a flowchart showing the operation (group unit) of the ATM connection release function.

[Figure 12] Operation of ATM connection setting function (individual)
It is a flowchart showing.

[Fig. 13] Operation of ATM connection release function (individual)
It is a flowchart showing.

FIG. 14 is a diagram showing a configuration of a connection management CAM.

[Explanation of symbols]

1 Base station controller 2a, 2b base station 3a, 3b mobile stations 4a, 4b wireless zone 10 Wireless transceiver 11 Modulator / demodulator 12 Wireless frame processing unit 13 Header converter 14 ATM cell transceiver 15 Control unit 20 Header extractor 21 Header addition part 22 Header conversion control unit 23 Header conversion memory 24 CAM for connection management 30 input ATM cells 31 output ATM cells 32 Connection setting request 33 Connection release request 40 ATM cell 41 VPI / VCI 42 Memory write request 43 Memory read request 44 memory address 45 CAM search request 46 CAM write request 47 match address 48 match signal 49 New VPI / VCI 50 connection data 51 Mobile station number 52 Header conversion stop signal 100 Header read control unit 101 Connection setting control unit 102 Connection release control unit 103 address generator 104, 105, 106, 107 Selector

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI H04Q 7/30 (58) Fields investigated (Int.Cl. ⁷ , DB name) H04L 12/56 H04Q ⁷ /20-7/38

Claims (13)

(57) [Claims] 1. In a wireless communication system for performing communication between a base station and a mobile station by ATM, a base station transmitting / receiving an ATM cell to / from the mobile station in a wireless zone is a mobile station existing in the same wireless zone. An associative memory storing a mobile station number for identifying and a group number for further finely classifying ATM connections with the mobile station, and the mobile station moving from a wireless zone to another wireless zone. when the handover occurs, based on the data of the associative memory, to set / release the ATM connections of the mobile station units collectively by hardware, the
A mobile station can simultaneously connect to multiple ATMs in the same wireless zone.
When switching the application, the data in the associative memory
Based on the ATM connection of the unit of the group
Set / release the connection management apparatus in a wireless communication system characterized by having a row Cormorant header converting section collectively by hardware. 2. The header conversion unit, a header extraction unit for extracting VPI / VCI of an input ATM cell, and an ATM.
Header conversion control unit for controlling cell header replacement and ATM connection setting / release, header conversion memory for storing new VPI / VCI after header conversion and connection data for each connection, and input ATM cell VPI / VPI / The connection management device in a wireless communication system according to claim 1, further comprising a header adding unit that replaces the VCI with a new VPI / VCI to form an output ATM cell. 3. The radio communication system according to claim 2, wherein the header conversion control unit outputs a header conversion stop signal and a mobile station number for instructing the header addition unit to stop the ATM cell header replacement. Connection management device in. 4. A header read control unit for reading the converted header from the header conversion memory each time the VPI / VCI extracted from an input ATM cell is input by the header conversion control unit. The connection setting control unit includes a connection setting control unit that sets an ATM connection, a connection release control unit that releases an ATM connection, and an address generation unit that generates an address for accessing the header conversion memory. 4. The connection management device in the wireless communication system according to claim 2, wherein the connection release control unit outputs a header conversion stop signal instructing a stop of the ATM cell header relocation and a mobile station number. 5. The connection in the wireless communication system according to claim 1 , wherein the associative memory stores an intermediate address indicating a storage position of header conversion data for each connection. Management device. 6. A wireless communication system for performing communication between a base station and a mobile station using ATM, wherein the base station transmitting and receiving ATM cells to and from the mobile station within the wireless zone is a mobile station existing within the same wireless zone. Storing a mobile station number for identifying each and a group number for further finely classifying ATM connections with the mobile station in an associative memory for each connection, and the mobile station moving from a wireless zone to another wireless zone. When a hand-over occurs due to the above, based on the data of the associative memory, the setting / release of the ATM connection for each mobile station is collectively performed by hardware, and
A mobile station can simultaneously connect to multiple ATMs in the same wireless zone.
When switching the application, the data in the associative memory
Based on the ATM connection of the unit of the group
Connection management method in a radio communication system, characterized in that the earthenware pots row collectively set / release in hardware. 7. A step of extracting a VPI / VCI from an input ATM cell when replacing an ATM cell header, and if there is no mobile station number and a header conversion stop signal, the extracted VPI / VCI and connection are already registered. The method further comprises the steps of confirming the ATM connection registration status of the associative memory based on the above, and the step of reading new VPI / VCI and connection data from the header conversion memory if the connection has been registered. 7. The connection management method in the wireless communication system according to 6. 8. When setting an ATM connection for each mobile station, when a connection setting request for each mobile station is input, a step of outputting a mobile station number and a header conversion stop signal, and an associative memory based on the unregistered connection. To detect the empty area of the mobile station, and if the connection can be set, write the mobile station number, group number , VPI / VCI to the address detected when the connection is not registered in the associative memory, and for header conversion The step of writing new VPI / VCI and connection data to the memory, the step of writing the registered connection to the address detected when the connection of the associative memory is not registered, the connection to be set up, or the associative memory free area If there is no mobile station number and Connection management method in a radio communication system according to claim 6, characterized in that a step of stopping the output of the header conversion stop signal. 9. When releasing an ATM connection for each mobile station, when a connection release request for each mobile station is input, a step of outputting a mobile station number and a header conversion stop signal; And the step of making a search request to the associative memory, the step of confirming the registration status of the ATM connection of the mobile station in the associative memory, and the case where at least one ATM connection to be released exists Connection unregistered and mobile station number searched addresses are written, and when there are no more ATM connections to release, the output of the mobile station number and header conversion stop signal is stopped. The connection in the wireless communication system according to claim 6. Management method. 10. When setting an ATM connection for each group, when a connection setting request for each group is input, a step of detecting an empty area of the associative memory based on the unregistered connection, and the connection is set. If possible, write the mobile station number, group number and VPI / VCI to the address detected when the connection in the associative memory is not registered, and write the new VPI / VCI and connection data to the header conversion memory. 7. The connection management method in a wireless communication system according to claim 6, further comprising: a step of writing connection registered in an address detected in the associative memory in which the connection is not registered. 11. When releasing an ATM connection in units of the group, when a connection release request in units of the group is input, the connection is registered, the mobile station number and the group.
, A step of making a search request to the associative memory based on the number of , the step of confirming the registration status of the ATM connection of the mobile station in the associative memory, and if there is at least one ATM connection to be released, 7. The connection management method in a wireless communication system according to claim 6, further comprising the step of writing connection unregistered in an address searched for in the associative memory with connection registered and mobile station number / group number . 12. When setting an individual ATM connection, when an individual connection setting request is input, a step of detecting an empty area of the associative memory based on unregistered connection, and if the connection can be set, A step of writing a mobile station number, a group number , and VPI / VCI to an address detected when the connection of the associative memory has not been registered; a step of writing new VPI / VCI and connection data to the header conversion memory; 7. The connection management method in the wireless communication system according to claim 6, further comprising the step of writing a connection registration completion to an address detected in connection non-registration. 13. A step of making a search request to an associative memory on the basis of connection registered, mobile station number, VPI / VCI, when an individual connection release request is input when releasing an individual ATM connection. The step of confirming the registration status of the ATM connection of the mobile station in the associative memory, and if there is any ATM connection to be released, the connection is registered in the associative memory and the mobile station number / VPI / VCI is searched. 7. The connection management method in the wireless communication system according to claim 6, further comprising the step of writing unregistered connection to the address.