JP3085295B2 - Connection management method and method for wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection management method for a wireless communication system in which the establishment / release of an ATM connection is performed collectively for each mobile station by hardware at the time of handover occurring when the mobile station moves. About the method.

[0002]

2. Description of the Related Art Data communication between a mobile station and a base station is called A
In a wireless communication system performed by TM, a handover occurs when a mobile station moves between wireless zones.
The occurrence of handover requires switching of the connection of the base station, and releases all ATM connections between the base station before the switching and the mobile station that has moved through the radio zone, and the connection between the base station after the switching and the mobile station. Set up a new ATM connection.

[0003] An example of a conventional ATM connection management system is described in Japanese Patent Application Laid-Open No. 6-53887. The ATM switching system and the system using the same described in this publication can be used in a case where communication is performed again using the same virtual channel as the means for maintaining the intra-network route / capacity of the virtual channel even after the communication is completed. Is
An ATM exchange characterized by comprising means for using the intra-network route / capacity of the virtual channel held by the holding means for this communication. Also, in the header conversion unit of the ATM exchange, it is necessary to set the header conversion table every time the control unit requests connection setting and release, so that redundancy is added to the configuration to set and release the ATM connection. In order to reduce the load on the control unit by reducing the frequency of performing the processing and simplifying the processing, various measures have been taken.

[0004]

Applying the above-described technology of the ATM switch to a header conversion unit of a base station, which needs to quickly set up and release a large number of ATM connections every time a handover occurs, Have difficulty. Further, when setting and release of the ATM connection are performed for each connection by the control unit of the base station, the processing time becomes long, and the load of the handover process becomes heavy, so that the load on the control unit of the base station increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connection management method and method for a wireless communication system in which setting / release of an ATM connection for handover caused by movement of a mobile station is collectively performed by hardware.

[0006]

A connection management system for a wireless communication system according to the present invention comprises a mobile station which is a mobile terminal device including a portable telephone, and a wireless zone in which communication data with the mobile station can be transmitted and received. A base station that transmits and receives communication data with a mobile station and controls communication of the mobile station; and a base station that connects to the base station and controls and exchanges communication data with the mobile station to control the base station. In a connection management method of a wireless communication system in which a wireless communication system having a control unit performs an ATM exchange, when the mobile station moves in the wireless zone and moves to another wireless zone, handover is performed between the base station and another base station. Over occurs,
The base station releases and sets an ATM connection on a hardware basis for each mobile station.

[0007] A connection management method for a wireless communication system according to the present invention comprises a mobile station, which is a mobile terminal device including a mobile phone, and a wireless zone having a wireless zone in which communication data with the mobile station can be transmitted and received. And a base station that controls communication of the mobile station, and a base station control unit that connects to the base station, controls and exchanges communication data with the mobile station, and controls the base station. A connection management method of a wireless communication system in a connection management method of a wireless communication system in which a communication system performs an ATM exchange, wherein the mobile station moves in the wireless zone and moves to another wireless zone. When a handover occurs in the base station, the base station releases and sets up the ATM connection on a hardware basis for each mobile station. Characterized in that it is.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of a base station control unit, a base station, and a mobile station in the wireless communication system of the present invention. FIG. 2 is a diagram showing a configuration of a base station in the wireless communication system of the present invention. FIG. 3 is a diagram illustrating a configuration of the header conversion unit of the present invention. FIG. 4 is a diagram illustrating a configuration of the header conversion control unit of the present invention. As shown in FIG. 1, the configuration of the present invention is applied to mobile stations 10-1, 10-2,..., 10-k (k
Are natural numbers), and the base stations 12-1, 12-2, and
..., 12-m (m is a natural number) and the base station 12 is the mobile station 1
, 12-m (m is a natural number) in a region where radio waves with the radio station 0 can be transmitted and received. -N
(N is a natural number) and the communication data transmitted and received by the plurality of base stations 12 and the plurality of mobile stations 10
The base station controller 16 manages a base station that transmits and receives data when the mobile station 2 moves. The communication between the mobile station 10 and the base station 12 is performed by an ATM (Asynchronous Tra).
For a handover that occurs when the mobile station 10 moves between wireless zones in a wireless communication system performed in the nsfer mode (asynchronous transfer mode), ATM connection management between the plurality of mobile stations 10 and the base station 12 is performed.
ATM of the mobile station 10 that has moved in the wireless zone with the base station 12
The setting and release of the connection are performed by hardware collectively for each mobile station.

As shown in FIG. 2, the base station of the present invention transmits and receives radio waves to and from the mobile station 10, a radio transmission / reception unit 18, demodulates received radio data, and modulates transmitted data to radio data. A modulation / demodulation unit 20, a radio frame processing unit 22 for controlling a radio frame synchronization signal and the like, a header conversion unit 24 having a function of setting and releasing an ATM connection, and an ATM for transmitting and receiving ATM cells.
Cell transmitting / receiving section 26, wireless transmitting / receiving section 18, and modem section 20
, Wireless frame processing unit 22, header conversion unit 24, and ATM
And a control unit 28 for controlling the cell transmitting / receiving unit 26.

As shown in FIG. 3, a header conversion unit 24 of the present invention inputs an input ATM cell and outputs a VPI (VPI) including information such as an address stored in a header of the ATM cell.
virtual Path Identifier: virtual channel identifier / VCI (virtual channel)
l Identifier: a virtual channel identifier), and a header extraction unit 30 for transmitting the VPI / VCI and the ATM cell. The header extracting unit 30 receives the transmitted ATM cell and newly generates a VP.
QoS (Quality of Service) that attaches I / VCI to the header and realizes various functions in the base station.
ce: service quality) information, signaling cell and O
AM cell (Operation AndMaintenn)
ance: operation / maintenance), a header providing unit 32 for providing connection data including route information for performing demultiplexing and multiplexing in the base station 12 and other data as additional information, and outputting an output ATM cell; The new VPI / VCI and connection data are stored in the data area for each connection, and new data is created and stored based on the memory address further transmitted by the transmitted write request, and transmitted. A header conversion memory 34 for outputting new VPI / VCI and connection data to the header providing unit 32 in response to a read request, and data including VPI / VCI, a mobile station number, and a setting bit in a data area for each connection. The data is written and transmitted in response to the stored and transmitted write request. The CAM is searched for data stored in each data area to come search request, transmits the match address coincidence signal when the matching result of the search
(Associative memory) connection management CAM 36
, A connection setting and release request from the control unit 28, and a VPI / VCI from the header extraction unit 30, transmit a memory write and read request and a memory address to the header conversion memory 34, and A header conversion control unit 38 for transmitting a CAM search and write request to the connection management CAM 36 and receiving a match address and a match signal from the connection management CAM 36.
It has a function of setting up an ATM connection and a function of releasing an ATM connection.

[0011] As shown in FIG.
Receives the VPI / VCI extracted by the header extracting unit 30, transmits a CAM search request to the connection management CAM 36 each time the VPI / VCI is received, receives a match signal transmitted when the search result matches, and converts the memory read request into header conversion. A header read control unit 40 for transmitting to the memory 34;
When a connection setting request is received from the control unit 28, C
An AM search request is transmitted to the connection management CAM 36, a match signal is received when the search result matches, a CAM write request is transmitted to the connection management CAM 36,
Upon receiving a connection release request from the control unit 28 and a connection setting control unit 42 for transmitting a memory write request to the header conversion memory 34, a CAM search request is transmitted to the connection management CAM 36, and transmitted when the search results match. A connection release control unit 44 for receiving a match signal and transmitting a CAM write request to the connection management CAM 36, a header read control unit 40,
When a CAM search request is received from the connection setting control unit 42 and the connection release control unit 44 and there is a valid signal, the CAM search request is sent to the connection management CAM.
When a CAM write request is received from the first selector 46 to be transmitted to the CAM 36, the connection setting control unit 42, and the connection release control unit 44, and there is a valid signal, the CAM write request is transmitted to the connection management CAM 36. The second selector 48 and the connection management C
An address for receiving a match address output together with a match signal transmitted when the search data matches the stored data from the AM and generating a memory address based on the match address so as to correspond to the set connection. And a generation unit 50.

Further, the configurations of the header conversion memory and the connection management CAM of the present invention will be described in detail with reference to FIGS. FIG. 5 is a diagram showing a configuration of a header conversion memory according to the present invention. FIG. 6 is a diagram showing the configuration of the connection management CAM of the present invention. As shown in FIG.
The header conversion memory 34 has a plurality of storage areas in which data can be stored for each data.
And new connection data and VPI / VCI to be added to the ATM cell. Data is VPI
, X bits for VCI, and Z bits for connection data. The minimum required memory capacity is proportional to the maximum allowable number of connections in the system. The header conversion memory 34 includes a header conversion control unit 38.
New data is created and stored based on the memory address further transmitted by the write request transmitted from the device, and a new V is generated in response to the read request transmitted.
The PI / VCI and the connection data are added to the header adding unit 32
Output to As shown in FIG.
The AM 36 has a plurality of storage areas that can store data, and stores data including setting bits, mobile station numbers, and VPI / VCI in the data area for each connection. Data is 1 bit for setting bit and K for mobile station number.
Bits, L bits for VPI, and M bits for VCI. The connection management CAM 36 writes the data in response to the transmitted write request, searches the data stored for each data area in response to the transmitted search request, and determines whether the search result search data and the storage data are the same. CA that sends a match address and match signal when matched
M (associative memory). When there are a plurality of words that match the search data, the word having the smallest address value of the connection management CAM 36 is selected.

Next, the operation of the header read control unit 40, the connection setting control unit 42, and the connection release control unit 44 in the embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a diagram showing a flowchart of the operation of the header replacement function of the present invention. FIG. 8 is a diagram showing a flowchart of the operation of the ATM connection setting function of the present invention. FIG. 9 is a diagram showing a flowchart of the operation of the ATM connection release function of the present invention. As shown in FIG. 7, the header read control unit 40 receives the VPI / VCI extracted by the header extraction unit 30 (Step A1). A CAM search request including VPI / VCI and setting bit = 1 as search data is transmitted to the connection management CAM 36 (step A2). If there is matching data as a result of the search, it is determined whether or not there is a matching signal transmitted (step A3). If the result of the determination is that there is no match signal, the operation ends as it is. As a result of the determination, if there is a coincidence signal, a new V
A memory read request for acquiring PI / VCI and connection data is output (step A4), and the operation ends.

As shown in FIG. 8, the connection setting control unit 42 receives a connection setting request from the control unit 28 (step B1). It is determined whether there is a connection to be set (step B2). If it is determined that there is no connection to be set, the operation ends. As a result of the determination, when there is a connection to be set, a CAM search request including the setting bit = 0 in the search data is transmitted to the connection management CAM 36 (step B3). As a result of the search, if the setting bit = 0, that is, if there is a free area, a match signal is transmitted, and the connection setting control unit 4
2 judges whether there is a coincidence signal (step B)
4). If the result of determination is that there is no match signal, the operation ends. As a result of the determination, if there is a match signal, a CAM write request including the setting bit = 1, the mobile station number, and the VPI / VCI in the data is transmitted to the connection management CAM 36 to perform connection setting (step B5). A memory write request is made to set a new VPI / VCI and connection data in the header conversion memory 34 (step B6), and the process returns to step B2.

As shown in FIG. 9, the connection release control unit 44 receives a connection release request from the control unit 28 (Step C1). A CAM search request including the set bit = 1 and the mobile station number in the search data is transmitted to the connection management CAM 36 (step C2). A match signal transmitted when the search data matches the stored data is transmitted, and the connection release control unit 44 determines whether there is a match signal (step C3). If the result of determination is that there is no match signal, the operation ends. If the result of the determination is that there is a match signal, a CAM write request including the setting bit = 0 in the data is transmitted to the connection management CAM 36 (step C4), and the process returns to step C2.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a handover occurs when the mobile station 10-2 moves from the wireless zone 14-1 to the wireless zone 14-2. Release / setting of the ATM connection at the time of handover is performed by the base station 12.
-1 and the mobile station 10-2 are released, and the A-to-A connection between the base station 12-2 and the mobile station 10-2 is released.
It is necessary to set a TM connection. The header conversion unit 24, which manages the ATM connection in the base station and replaces the header of the ATM cell, has a function of replacing the header of the ATM cell, a setting function of the ATM connection,
It has a TM connection release function.

The mobile station 10 existing in the area of the radio zone 14-1 and having a connection established with the base station 12-1
-2 transmits and receives communication data to and from the base station 12-1. The transmitted communication data is received by the base station 12-1, and the received communication data is demodulated, analyzed, and sent to the header conversion unit 24. Header conversion unit 24
ATM cells included in the communication data sent to
When the header conversion unit 24 receives the ATM cell as a TM cell, the input ATM cell is input to the header extraction unit 30. The header extraction unit 30 extracts the VPI / VCI, and outputs the VPI / VCI to the header conversion control unit 38. And outputs the ATM cell to the header adding unit 32. The header read control unit 40 of the header conversion control unit 38 outputs a CAM search request to the connection management CAM 36 using the VPI / VCI and the setting bit = 1 as search data,
Check the registration status of the M connection. If a match signal is output, that is, if the connection has been registered, the address generation unit 50 outputs the memory address generated from the match address to the header conversion memory 34, and the header read control unit 40 Outputs a memory read request. The new VPI / VCI and connection data read from the header conversion memory 34 are output to the header providing unit 32. Header adding unit 32
Is the VP of the ATM cell input from the header extraction unit 30.
Replace I / VCI with new VPI / VCI and output A
Output as a TM cell. It also outputs connection data as needed. Further, the base station control unit 16
The ATM cell is output to the base station 12-1. Base station 12-
Upon receiving the output ATM cell, the first ATM cell transmitting / receiving section 26 transmits the ATM cell to the header converting section 24. Upon receiving the ATM cell, the header conversion unit 24 adds a new VPI / VC
I, the operation of giving connection data is performed as described above. The header conversion unit 24 transmits the communication data including the ATM cells to the radio frame processing unit 22, the radio frame processing unit 22 processes the data, and transmits the data to the modulation / demodulation unit 20, and the modulation / demodulation unit 20 modulates the communication data. Wireless transceiver 1
Send to 8. Radio transmitting / receiving section 18 transmits the modulated communication data to mobile station 10-2.

When the mobile station 10-2 moves from the radio zone 14-1 to the radio zone 14-2, the base station 12-2 generates a connection with the mobile station 10-2. Base station 12
No. -2 determines whether to generate a connection based on the state of the radio wave of the mobile station 10-2. As a result of the determination, when a connection is to be generated, the control unit 28 transmits a connection setting request. The connection setting control unit 42
When a connection setting request is input, setting bit = 0
A CAM search request is output to the connection management CAM 36 as search data, and the connection management CA is output.
An empty area of M36 is detected. If a match signal is output, that is, if the connection can be set, the setting bit = 1, the mobile station number, and the VP for the address detected by the setting bit = 0 of the connection management CAM 36
Write I / VCI. Setting the setting bit = 1 means that
This is to register a connection. The address generator 50 outputs the memory address generated from the matching address to the header conversion memory 34, the connection setting controller 42 outputs a memory write request to the header conversion memory, and outputs a new VPI / VCI and connection data. To write. If there is a connection to be set, the vacant area of the connection management CAM 36 is detected again using the setting bit = 0 as search data. If a vacant area exists, the connection management CAM 36 and the header conversion memory 34 Perform the same settings. The above operation is repeated until there are no more connections to be set.

When the radio wave of the mobile station 10-2 becomes weak, the base station 12-1 releases the connection. Control unit 2
8 transmits a connection release request. When the connection release request is input, the connection release control unit 44 outputs a CAM search request to the connection management CAM 36 using the setting bit = 1 and the mobile station number as search data, and outputs a CAM search request to the connection management CAM 36. Check the registration status of the ATM connection. A coincidence signal is output, that is, the ATM connection to be released is 1
If there is at least one, the connection management CAM 36
Then, the setting bit = 0 is written to the address searched by the setting bit = 1 and the mobile station number. Setting the setting bit = 0 means canceling the registration of the connection. The setting bit = 1 and the mobile station number are again used as search data, and the AT of the mobile station in the connection management CAM
Check the registration status of the M connection. If the coincidence signal is output, that is, if there is still an ATM connection to be released, the connection management CAM 36
Make the same settings as above. The above operation is repeated until there is no ATM connection to be released. By performing the above processing, the release of the ATM connection can be collectively performed by hardware in units of mobile stations.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 10 is a diagram illustrating a configuration of a connection management CAM according to another embodiment of the present invention. As shown in FIG. 10, the connection management CAM 36 has a plurality of storage areas that can be stored for each connection. The stored data includes a setting bit capable of determining whether valid data is stored in the storage area, a mobile station number for identifying the mobile station, a VPI as a virtual path identifier, and a VCI as a virtual channel identifier. , And the intermediate address stored in the connection management CAM 36 such that the memory address of the header conversion memory 34 and the matching address of the connection management CAM 36 correspond one-to-one for each connection. C for connection management CAM 36
If the search data matches the stored data when the AM search request is output, an intermediate address of the stored data is output to the header conversion control unit 38 instead of the address of the connection management CAM 36 as a matching address. The connection management CAM 36 needs to set a different value for the intermediate address for each word, and rewrites the value of the intermediate address for each connection, so as to store a new VPI / VCI and connection data for header conversion. It is possible to easily change the address of the memory.

[0021]

According to the connection management method for a wireless communication system of the present invention, data communication between a mobile station and a base station is performed by an AT.
In a wireless communication system performed by M, when a mobile station moves between wireless zones and a handover occurs, the ATM of a base station that communicates with a plurality of mobile stations.
With regard to connection management, the setting and release of the ATM connection between the base station and the mobile station that has moved in the wireless zone are collectively performed by hardware in units of mobile stations, thereby shortening the processing time for setting / release of the ATM connection, The load on the handover process in the base station is reduced by reducing the load on the control unit of the station.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a base station control unit, a base station, and a mobile station in a wireless communication system of the present invention.

FIG. 2 is a diagram showing a configuration of a base station in the wireless communication system of the present invention.

FIG. 3 is a diagram illustrating a configuration of a header conversion unit according to the present invention.

FIG. 4 is a diagram illustrating a configuration of a header conversion control unit according to the present invention.

FIG. 5 is a diagram illustrating a configuration of a header conversion memory according to the present invention.

FIG. 6 is a diagram illustrating a configuration of a connection management CAM of the present invention.

FIG. 7 is a diagram illustrating a flowchart of an operation of a header replacement function of the present invention.

FIG. 8 is a diagram showing a flowchart of an operation of an ATM connection setting function of the present invention.

FIG. 9 is a diagram showing a flowchart of the operation of the ATM connection release function of the present invention.

FIG. 10 shows a connection management C according to another embodiment of the present invention.
FIG. 3 is a diagram illustrating a configuration of an AM.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mobile station 12 Base station 14 Radio zone 16 Base station control unit 18 Radio transmission / reception unit 20 Modulation / demodulation unit 22 Radio frame processing unit 24 Header conversion unit 26 ATM cell transmission / reception unit 28 Control unit 30 Header extraction unit 32 Header addition unit 34 Header conversion Memory 36 CAM for connection management 38 Header conversion control unit 40 Header read control unit 42 Connection setting control unit 44 Connection release control unit 46 First selector 48 Second selector 50 Address generation unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/28 H04B 7/26

Claims (9)

(57) [Claims] A mobile station, which is a mobile terminal device including a mobile phone, has a wireless zone in which communication data with the mobile station can be transmitted and received, and transmits and receives communication data with the mobile station. A wireless communication system comprising: a base station for controlling, and a base station control unit for connecting to the base station, controlling and exchanging communication data with the mobile station, and controlling the base station. In the connection management method, the base station transmits a CAM search request including a setting bit and the VPI and the VCI, and a VPI that is a virtual path identifier and a VCI that is a virtual channel identifier included in an ATM cell. Means for storing the setting bit and a storage area storing VPI and VCI with the setting bit included in the CAM search request. Means for searching based on the virtual path identifier and the virtual channel identifier, and when there is data that matches the storage area, a match signal is transmitted, and means for determining whether or not the match signal is transmitted; If not, means for terminating the operation; and, if there is a match signal, a memory read request for the ATM cell to obtain connection data including route information and service quality information and new VPI and VCI. And a means for terminating the operation. When the mobile station moves in the wireless zone and moves to another wireless zone, a handover occurs between the base station and another base station, and the ATM connection is released. And connection setting on the hardware by the base station for each mobile station. 2. A mobile station, which is a mobile terminal device including a mobile phone, has a wireless zone in which communication data with the mobile station can be transmitted and received, and transmits and receives communication data with the mobile station. A wireless communication system comprising: a base station for controlling, and a base station control unit for connecting to the base station, controlling and exchanging communication data with the mobile station, and controlling the base station. In the connection management method, the base station includes: a radio transmitting / receiving unit that transmits and receives a radio wave including the communication data with the mobile station; demodulates the received radio data and modulates transmittable transmission data into radio data. A wireless frame processing unit that controls a wireless frame synchronization signal of the wireless data, transmits and receives ATM cells, and recognizes a virtual path of the ATM cells. VCI is the VPI and the virtual channel identifier is a child
A header conversion unit for setting and releasing the ATM connection by adding a connection data or adding connection data; an ATM cell transmitting and receiving unit for transmitting and receiving the ATM cell; the wireless transmitting and receiving unit, the modem and the wireless frame processing And a control unit that controls the header conversion unit and the ATM cell transmission / reception unit. The header conversion unit inputs the ATM cell and outputs information such as an address stored in a header of the ATM cell. Extract the VPI and VCI including the VPI and VCI and the ATM
A header extracting unit for transmitting a cell, and receiving the transmitted ATM cell, and setting a newly determined VP
The I / VCI is added to the header to realize various functions in the base station, and connection data including signaling cell and operation and maintenance information is added as additional information.
A header adding unit for outputting a TM cell; storing the new VPI / VCI and the connection data in a data area for each connection; and a memory address further transmitted by a transmitted write request. New data is created and stored, and the new VPI / V
A header conversion memory for outputting the CI and the connection data to the header providing unit, and data including the VPI / VCI, the mobile station number, and the setting bit are stored in a data area for each connection and transmitted. Connection management for writing the data in response to a write request, searching for the data stored in each data area in response to a search request transmitted, and transmitting a match address and a match signal when the search results match. A CAM, a connection setting and release request from the control unit,
Receiving the VPI / VCI from the header extraction unit, transmitting a memory write and read request and the memory address to the header conversion memory, transmitting a CAM search and write request to the connection management CAM, A header conversion control unit that receives the match address and the match signal from the connection management CAM; and when the mobile station moves in the wireless zone and moves to another wireless zone, the handover is performed by the base station and another base station. A connection management method for a wireless communication system, characterized in that the base station releases and sets an ATM connection on a hardware basis for each mobile station when an over occurs. 3. The connection data is transmitted to a base station of an OAM cell, which is information of QoS of communication in ATM exchange for realizing various functions in the base station and information of an OAM cell as information of signaling cell and operation and maintenance. The connection management method for a wireless communication system according to claim 2, further comprising at least route information that is information for performing separation and multiplexing. 4. The method according to claim 1, wherein the header conversion memory stores the new V
4. The connection management method for a wireless communication system according to claim 2, comprising a PI and a VCI, and connection data including service quality information and route information. 5. The connection management CAM comprises: a setting bit; a mobile station number for identifying the mobile station;
5. The connection management method for a wireless communication system according to claim 4, comprising I and VCI. 6. The connection management CAM further comprises an intermediate address in which a memory address of the header conversion memory and an address corresponding to the connection management CAM correspond one-to-one for each connection. The connection management method for a wireless communication system according to claim 5, wherein 7. A) obtaining a virtual path identifier (VPI) and a virtual channel identifier (VCI) included in an ATM cell; and (b) a CAM including setting bits and the VPI and VCI.
Transmitting a search request; c) searching a storage area storing the set bits, VPI and VCI using the set bits, virtual path identifier and virtual channel identifier included in the CAM search request, A) a match signal is transmitted when there is data matching the above; and d) determining whether or not the match signal has been transmitted; d) ending the operation if there is no match signal as a result of the determination; e). As a result of the determination, if there is a match signal, connection data including route information and service quality information and a new VPI
Transmitting a memory read request for the ATM cell to obtain the VCI and the VCI, and terminating the operation, and a connection management method for a wireless communication system. 8. A step of receiving a connection setting request; b) a step of determining whether there is a connection to be set; and c) ending the operation as it is if there is no connection to be set as a result of the determination. And d) transmitting a CAM search request including the data of the setting bit if there is a connection to be set as a result of the determination; and e) storing the storage area storing the setting bit in the CAM.
Search by the setting bit included in the search request, a match signal is transmitted when there is data matching the storage area,
Determining whether or not the coincidence signal is transmitted; f) ending the operation if the result of the determination is that there is no coincidence signal; and g) determining if the coincidence signal is present as a result of the determination. Changing a setting bit and transmitting a CAM write request for setting a mobile station number, a VPI and a VCI to a storage area of the changed setting bit; and h) newly adding route information and service to another storage area. Connection data including quality information and new VPI and VCI
Transmitting a memory write request to set the following, and returning to step b: a connection management method for a wireless communication system. 9. a) receiving a connection release request; b) transmitting a CAM search request including a setting bit and a mobile station number; and c) a storage area storing the setting bit and the mobile station number. By the setting bit and the mobile station number included in the CAM search request, and when there is matching data, a matching signal is transmitted, and it is determined whether or not the matching signal is transmitted; d) E) ending the operation if there is no match signal as a result of the determination; e) if there is a match signal as a result of the determination, issuing a CAM write request for changing the setting of the set bit of the data of the storage area that has matched. Transmitting and returning to step b.