KR20010002757A - Method and the Unit of MVCI Assignment - Google Patents

Abstract

PURPOSE: A device for assigning a mobile terminal and a service identifier is provided to allocate MAC address of 1 byte to a mobile terminal in a base station when initializing a the mobile terminal and to recollect the allocated MAC address and allocate the address to other mobile terminal when the mobile terminal is out of service areas. Therefore, the efficiency of mobile channel is improved when transmitting ATM cell signals through the wireless channel in a wireless ATM LAN system. CONSTITUTION: A wireless receiver(30) and a wireless transmitter(40) transceive a data transceiving signal through a wireless channel. A media access control(MAC) address (MT_A) region requesting information receiver(50) receives a signal from the wireless receiver(30) to store MT_A region assigning requesting information, and outputs an identification(MT_ID) information signal of a self fixed byte, then generates a driving signal(ST_A) to drive an address generator. The address generator(110) receives the driving signal(ST_A), and outputs an address(A) of a corresponding region, a MT_A region and an identification(MT_ID) address signal of a self fixed byte to read a mapping memory. A MT_ID comparator(60) compares a MT_ID signal of a self output fixed byte of the MT_A region requesting information receiver(50) with a MT_ID signal of the mapping memory, and decides whether the same MT_ID is stored in the mapping table memory. A MT_A region storage(70) stores a MT_A value when an inputted signal(A) from the MT_ID is low, and stores a corresponding MT_A value regardless of the inputted signal(A) when an outputted signal(Sig-A) from the MT_ID is high, then outputs an address value(Sig-B) that a corresponding MT_A exists. A virtual path identifier(VPI) requester(80) transmits MT_ID information and MT_A information to an asynchronous transfer mode(ATM) switch. A VPI receiver(90) receives VPI information from the ATM switch to output a VPI value, and generate a driving signal(ST_B) for driving the memory address generator(110) to reach a high state, then makes the outputted signal of the memory address generator display an address of a corresponding MT_A. The wireless transmitter(40) stores the MT_ID information and the VPI information in the mapping memory table, and transmits the MT_ID and the MT_A information transmitted to a MT_A region transmitter, to a mobile terminal requesting a MT_A assignment.

Description

Mobile terminal and service identifier assignment method and device therefor {Method and the Unit of MVCI Assignment}

The present invention relates to a method for allocating a mobile station and a service identifier and a hardware configuration using the same. In particular, each mobile station is identified in a wireless ATM LAN system based on an asynchronous transmission mode (ATM) scheme, and furthermore, a service in each mobile station is identified. The assignment of identifiers to distinguish them.

In the conventional wireless LAN system, in order to identify each terminal on a wireless channel shared by a plurality of users, a unique number of 6 bytes is assigned to each mobile terminal, and these 6 bytes are transmitted together through a wireless channel during data transmission.

As such, a function of managing a channel commonly used by a plurality of users is called a medium access control (MAC) function, and a unique identification assigned to each terminal to distinguish each terminal on a shared medium. The number is usually called the MAC address.

Meanwhile, in the ATM method, all signals are transmitted through an ATM cell, and each cell transmits a transmission path through a virtual path identifier (hereinafter referred to as a VPI) and a virtual channel identifier (hereinafter referred to as a VCI) in a header. Get to know.

Accordingly, it is possible to use a one-to-one correspondence between a MAC address for identifying each user and a virtual path identifier for designating a path of an ATM cell on a wireless channel commonly used by a plurality of users.

Conventional wireless LAN technology mainly aims to transmit data between a base station and a mobile terminal, and in order to identify a plurality of terminals, a unique number is assigned to each terminal and a method of transmitting the same together during data transmission.

Only recently have these core parts been commercialized in developed countries.

In Korea, due to the weakness of the overall wireless technology, core parts cannot be developed, and the core parts of developed countries are imported to produce systems.

Furthermore, wireless ATM LAN systems that accept ATM services have been recently researched and have not yet been standardized or commercially available, and some developed countries have developed their own laboratory models.

In order to achieve the above, the present invention, in the wireless ATM LAN system aimed at providing ATM service, the base station at the time of initialization of each mobile terminal in order to increase the efficiency of the wireless channel when transmitting the ATM cell signals over the wireless channel, each mobile terminal at the base station Provides a MAC address allocation method and an implementation means for retrieving the MAC address of 1 byte and retrieving the assigned MAC address and assigning it to another mobile terminal when the mobile terminal leaves the service area or turns off the power. For the purpose of

In order to achieve the above object, the present invention uses a mapping memory of a unique byte (MT_ID) and a MAC address (MT_A) of a certain byte to access a medium access control identifier (MT_ID) signal of a certain byte size suitable for a wireless channel. A second process of mapping a VCI value of a predetermined byte to an MVCI value of a byte suitable for a wireless channel using a first process of mapping to an address MT_A and a mapping memory configuration of a service identifier (MVCI) and a virtual path identifier (VCI) It characterized in that it comprises a process.

In order to improve the efficiency of a wireless channel, the present invention does not transmit a 6-byte unique number for each mobile terminal through a wireless channel as in a conventional wireless LAN system. The present invention relates to a method of allocating a MAC address that allocates a MAC address of bytes and recovers the assigned MAC address and assigns it to another mobile terminal when the mobile terminal leaves the service area or turns off the power. It will provide a foundation for early commercialization of ATM LAN systems.

1 is an overall configuration diagram of a wireless ATM LAN according to the present invention;

2 is a configuration diagram of MT_ID and MT_A mapping memory according to the present invention;

3 is a hardware configuration diagram of MT_ID and MT_A mapping implementation according to the present invention;

4 is a configuration diagram of MVCI and VCI mapping memory to which the present invention is applied;

5 is a hardware configuration of the MVCI and VCI mapping implementation in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10: ATM switch 20: service area

21: base station 22: mobile terminal

23: wireless channel 30: wireless receiver

40: radio transmitter 50: MT_A request information receiver

60: MT_ID Comparator 70: MT_A Saver

80: VPI request unit 90: VPI receiver

100: mapping table memory 110: memory address generator

120: MT_A transmitter 130: channel request information receiver

140: channel information transmitter 150: VCI comparator

160: MVCI Saver

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

In the configuration of the wireless ATM LAN system which is the basis of the present invention, FIG. 1 shows a service area 20 including a base station 21 having a wireless transmitter and receiver connected by wire to an ATM switch 10.

Referring to FIG. 1, the base station 21 connected by wire to the ATM switch 10 has a wireless transmitter and receiver, and the service area 20 is schematically represented by a dotted line.

A total of N mobile terminals 22 also having a wireless transmission / reception function communicate with the base station 21 via a wireless channel 23.

In this case, the base station 21 should be able to distinguish a plurality of mobile terminals 22 in its service area.

In addition, since each mobile terminal 22a. 22b, 22c can request a plurality of ATM services at the same time, it is necessary to distinguish each service.

In ATM system, all signals are transmitted through ATM Cell. One ATM Cell is composed of 5 bytes of header and 48 bytes of information signal.

The 5-byte header contains 1-byte Virtual Path Identifier (VPI) and 2-byte Virtual Channel Identifier (VCI) information. Exchange and transmission to the cell takes place.

Therefore, in order for each mobile station to access the ATM network through the wireless channel, the VPI and VCI used by the ATM network are mapped to the MAC address (hereinafter referred to as MT_A) and service identifier (hereinafter referred to as MVCI) suitable for the wireless channel. It is necessary.

In the present invention, the VPI in the ATM Cell header is mapped to MT_A of 1 byte and used to identify each mobile station on the radio channel, and the VCI of 2 bytes is mapped to MVCI of 1 byte.

When operating a wireless LAN system, it is sufficient for one base station to accommodate less than 100 mobile terminals, so that the size of MT_A for the base station to distinguish the mobile terminals in its own area on a wireless channel is enough to be about 1 byte.

Up to 256 mobile terminals can be identified by 1 byte, and each mobile terminal has a unique number of 6 bytes (hereinafter, referred to as MT_ID) as in the conventional wireless LAN system.

Typically, the user of each mobile terminal enters this unique number at initialization.

This MT_ID is needed only in the initial process of allocating MT_A of 1 byte to the mobile station by the base station and is not used for actual data transmission. Therefore, the amount of information added during data transmission is 1/6 compared to the conventional wireless LAN system using 6 bytes. 6 is reduced to 1 byte.

MT_A and MT_ID of each mobile terminal have a one-to-one correspondence with each other, and MT_A has one-to-one correspondence with the ATM cell's VPI in terms of ATM cell delivery.

However, the MT_ID of the mobile station is unique, whereas the MT_A and VPI values corresponding to the one-to-one correspond to the appropriate values assigned by the base station and the ATM switch.

In terms of service identification, up to 256 services can be identified by allocating 1 byte to identify each service in one mobile terminal.

Actually, the number of services used simultaneously by one mobile terminal is expected to be less than 10, so two-byte VCI in ATM cell can correspond one-to-one with one byte of MVCI.

As a result, the base station can support up to 256 mobile terminals by using 1 byte of MT_A and 1 byte of MVCI on the radio channel, and each terminal can distinguish up to 256 services.

The MT_A and MVCI values mentioned above are used only for the purpose of distinguishing each mobile station and the service type of each mobile station on the mobile station in order to increase the efficiency of the wireless channel.

That is, in the wireless ATM LAN system, the base station 21 shown in FIG. 1 is responsible for the function of binding the transmission demands of the mobile stations in its service area to the ATM switch.

In order to process such a mapping process, the base station has MT_A and VPI mapping table information shown in FIG. 2.

In FIG. 2, when 1 bit is allocated to the "A" region and the corresponding MT_A has already been allocated to the mobile terminal, it is set to high, and low if it is not allocated to the mobile terminal.

The "MT_A" area is pre-filled with 256 numbers from "0" to "11111111" in binary.

This value is an MT_A value for identifying each mobile station on a wireless channel, and is composed of 8 bits to accommodate up to 256 mobile stations.

Also, the "VPI" area is recorded by the procedure described below. When power is supplied to the mobile station, the mobile station sends its MT_ID information to the base station and requests MT_A information to be used by the mobile station.

When the base station receives the MT_A allocation request from the mobile station, it checks the "A" region in the mapping table shown in FIG. 2 and allocates an unassigned MT_A value.

If all MT_As are allocated, it informs the mobile station that it cannot currently service.

Thereafter, the base station sends MT_A information and MT_ID information to the ATM switch and requests a VPI value to be used by the corresponding terminal.

When the ATM switch receives a VPI value from the base station, it allocates an appropriate VPI value and sends it back to the base station.

If the VPI value is not allocated due to too much communication to be processed in the ATM switch, the base station informs the mobile station that it cannot currently service and does not allocate MT_A.

When the VPI value is allocated from the ATM switch, the base station stores the value in the "VPI" area next to the corresponding MT_A area of the mapping table shown in FIG. 2 and assigns the MT_A and VPI values by setting the "A" value of the corresponding area high. Is displayed.

After that, the MT_A allocation procedure is completed by sending the MT_A value to the MS requesting MT_A.

The mobile station can start data transmission after receiving the MT_A assignment from the base station. In the data transmission, the mobile station can know which terminal is currently transmitting by adding the MT_A value.

The base station continuously checks whether the mobile station exists in its service area and when the mobile station disappears from its service area, sets the value of the "A" area with the corresponding MT_A value to low to use it to service other mobile terminals. do.

The configuration diagram of the hardware is illustrated in FIG. 3, and the wireless receiver 30 and the wireless transmitter 40 process a function of transmitting and receiving data signals through a wireless channel.

The MT_A request information receiving unit 50 is responsible for storing MT_A allocation request information from the mobile terminal, outputs an MT_ID signal as its output, and also generates an ST_A signal to start driving the memory address generator 110. .

Upon receiving the ST_A signal, the memory address generator 110 outputs an Addr signal to read the mapping table memory 100.

The Addr signal is sequentially generated until all the memories shown in FIG. 2 are read out.

The mapping memory 100 outputs the A, MT_A and MT_ID signals shown in FIG. 2 according to the Addr signal.

Among these, the Sig_C signal is composed of A and MT_ID. The MT_ID comparator 60 compares the output MT_ID signal of the MT_A request information receiver with the MT_ID signal in the Sig_C signal, and the same MT_ID is already stored in the mapping table memory 100. Judge.

This process is applied only when A value of Sig_C signal is high, that is, a value that is already assigned and used.

If it already exists, the output Sig_A signal is set high so that the MT_A storage 70 stores the corresponding MT_A value.

On the other hand, the input Sig_D signal of the MT_A storage 70 is composed of A and MT_A of the output of the mapping table memory.

The MT_A storage 70 stores the MT_A value when the input signal A is low.

As described above, when the output Sig_A signal of the MT_ID becomes high, the MT_A storage 70 stores the MT_A value regardless of the value of the input signal A.

If the low signal is not found in the A signal until the generation of the output Addr signal of the memory address generator 110 is completed, it is determined that the MT_A has already been allocated and the MT_A cannot be allocated to the corresponding mobile station. .

In addition, the output Sig_B signal of the MT_A storage 70 becomes a valid MT_A value.

As shown in FIG. 2, this value becomes an address value in which the corresponding MT_A exists.

This value is then used to store the VPI output of the VPI receiver in the mapping table memory.

The VPI request unit 80 processes the function of sending the received MT_ID information and MT_A information together to the ATM switch.

The VPI receiver 90 receives VPI information from an ATM switch, outputs a VPI value, and makes the ST_B signal high for driving the memory address generator 110 upon receiving the information.

As soon as ST_B becomes high, the output MT_A signal of the MT_A storage 70 is loaded into the memory address generator 110.

Therefore, the output Addr signal of the memory address generator 110 immediately indicates the address where the corresponding MT_A is located.

At this time, by storing the MT_ID information and the VPI information in the mapping table memory 100, a series of procedures are completed, and the MT_ID and MT_A information are sent to the MT_A transmitter and then transmitted to the MS which requested MT_A allocation through the radio transmitter 40.

On the other hand, a service identifier for identifying a plurality of ATM services in each mobile terminal is assigned by the following procedure.

When a mobile station assigned MT_A wants to transmit ATM service information, it first requests to allocate a channel to a base station.

At this time, the mobile station transmits the MT_A value and the VCI value of the ATM cell to be transmitted to the base station.

The base station maps the received VCI value of 2 bytes to the MVCI value of 1 byte and sends the information to the mobile terminal.

The mobile station then maps the VCI value to the MVCI value and transmits the data.

In order to process such a mapping process, the base station has VCI and MVCI mapping table information shown in FIG. 4 for each UE currently connected.

In FIG. 4, 1 bit is allocated to the “A” region so that the VCI is high when the VCI is currently in use, and low when the VCI is not in use.

The "MVCI" area, on the other hand, contains 256 numbers in advance, from "0" to "11111111" in binary.

This value is an MVCI value for identifying a service in a wireless channel, and one mobile terminal can access up to 256 services simultaneously.

And the "VCI" area is recorded by the procedure described below. When the mobile station assigned the appropriate MT_A wants to transmit ATM service data, the mobile station transmits its MT_A value to the base station and the VCI value of the ATM cell to be transmitted. It sends to the base station and asks the base station to reserve a radio channel for transmitting the corresponding ATM service.

When receiving a channel allocation request from the mobile station, it checks the "A" area in the mapping table shown in FIG. 4 and allocates an unassigned MVCI value.

If all MVCIs are assigned, it informs the mobile station that it cannot currently service.

If there is an unassigned MVCI, the base station selects the MVCI value and stores the VCI value received from the mobile terminal in the "VCI" area next to the corresponding MVCI area of the mapping table shown in FIG. 3 and the "A" value of the corresponding area. Set to high to indicate that the MVCI and VCI values have been assigned.

Then, the MVCI allocation procedure is completed by sending the MVCI value mapped with the VCI value to the mobile station requesting the channel.

After all ATM service information having the same VCI value is transmitted, the value of the "A" area shown in FIG. 4 is set low to be used to identify another service.

5 is a diagram illustrating a hardware implementation. The wireless receiver 30 and the wireless transmitter 40 process a function of transmitting and receiving data signals through a wireless channel.

The channel request information receiving unit 130 is responsible for storing the VCI allocation request information from the mobile terminal. The channel request information receiving unit 130 outputs a VCI signal as its output and also generates an ST_A signal to start driving the memory address generator 110.

Upon receiving the ST_A signal, the memory address generator 110 outputs an Addr signal to read the mapping memory 100.

The Addr signal is sequentially generated until all the memories shown in FIG. 4 are read out.

The mapping memory 100 outputs the A, MVCI, and VCI signals shown in FIG. 4 according to the Addr signal.

Among them, the Sig_B signal is composed of A and VCI. The VCI comparator 150 compares the output VCI signal of the channel request information receiving unit with the VCI signal in the Sig_B signal to determine whether the same VCI is already stored in the mapping table memory 100. Judge.

This process is applied only when A value of Sig_B signal is high, that is, a value that is already assigned and used.

If it already exists, the output Sig_A signal is set high so that the MVCI storage 160 stores the corresponding MVCI value.

On the other hand, the input Sig_C signal of the MVCI storage 160 is composed of A, MVCI of the output of the mapping table memory.

The MVCI storage unit 160 stores the MVCI value when the input signal A is low.

As described above, when the output Sig_A signal of the VCI comparator 150 becomes high, the MVCI storage unit stores the corresponding MVCI value regardless of the value of the input signal A.

If the low signal is not found among the A signals until the generation of the output Addr signal of the memory address generator 110 is completed, it is determined that all MVCIs have already been allocated and the MVCI cannot be allocated to the corresponding mobile terminal.

The output of the MVCI store 160 is a valid MVCI value, which is an address value in which the corresponding MVCI exists, as shown in FIG. 4.

This value is then used to store the data in the mapping table memory, and immediately after the valid MVCI value is stored loads the output MVCI signal of the MVCI store 160 into the memory address generator 110.

Therefore, the output Addr signal of the memory address generator 110 immediately points to the address where the corresponding MVCI is located.

At this time, by storing the received VCI information in the mapping table memory 100, a series of procedures are completed, and the MVCI and VCI information are sent to the channel information transmitter 140, and then the mobile terminal 40 requests channel assignment through the radio transmitter 40. Is sent.

As described above, when the 1-byte terminal identifier and the 1-byte service identifier granting scheme provided in the present invention are applied, each terminal and service can be identified on a wireless channel shared by a plurality of users with only 2 bytes of information. Therefore, compared to the case of distinguishing the mobile terminal only by the conventional 6 bytes, there is an effect of increasing the efficiency of the radio channel due to the reduction of the excess information transmission on the radio channel.

Claims (6)

In the assignment of an identifier for identifying each mobile station in the wireless ATM LAN system and distinguishing services from the mobile station, Mobile terminal and service, characterized by mapping a unique number of unique number (MT_ID) signal to a MAC address (MT_A) signal suitable for a wireless channel using a mapping table having a MAC address (MT_A) and a virtual path identifier (VPI) How to assign an identifier. The method of claim 1, The mapping to MAC address is A first step of requesting medium access control (MAC) address information to be used by the mobile station, by sending the unique number (MT_ID) information of its fractional byte in the base station; Receiving, by the base station, MAC address information request from the mobile station, identifying an address area and then assigning an unassigned MAC address area value; After allocating the MAC address area value, the base station sends the MAC address area information and its unique number of unique byte (MT_ID) information to the ATM switch to request a virtual path identifier (VPI) to be used by the corresponding terminal. Steps; A fourth step of allocating an appropriate VPI value to the base station when the ATM switch receives a virtual path identifier (VPI) value from the base station; The base station receiving the VPI value from the ATM switch stores the value in the VPI area, sets the address value of the area to high, indicates that the MAC address area and the VPI value are allocated, and then sends the MAC to the MS requesting the MAC address area. And a fifth step of sending an address range value. In the assignment of an identifier for identifying each mobile station in the wireless ATM LAN system and distinguishing services from the mobile station, A mobile terminal characterized by mapping a virtual channel identifier value of a predetermined byte to a service identifier value of a byte suitable for a wireless channel using a mapping table having a virtual channel identifier (VCI) and a service identifier (MVCI) suitable for a wireless channel. How to assign a service identifier. The method of claim 3, wherein The mapping to the service identifier value is When a mobile station assigned an appropriate MAC address area wants to transmit ATM service data, the mobile station transmits its MAC address and VCI value of the ATM cell to the base station to the base station. Requesting to reserve a channel; A second step of allocating an unassigned MVCI value after checking an address area of a mapping table when receiving a channel allocation request from the mobile station; And assigning the MVCI value mapped to the VCI value to the mobile station requesting the channel after the random MVCI value allocation, and completing the allocation of the MVCI. For allocating a mobile terminal identifier for identifying a plurality of mobile terminals and identifying a service type for each terminal in a wireless ATM LAN system, A wireless receiver and a wireless transmitter for transmitting and receiving data transmission and reception signals through a wireless channel; Receives the signal received from the wireless receiver, stores the MAC address area (MT_A) allocation request information from the mobile terminal, and outputs its own number of unique identification number (MT_ID) information signal, the drive signal (ST_A) A MAC address area request information receiving unit which generates and drives the address generator; The drive signal ST_A receives the address A of the corresponding region, the MAC address region MT_A, the address Addr signal of the unique number MT_ID of its fractional byte, and reads the mapping memory. A generator; The unique number of its fractional byte to determine whether the same MT_ID is already stored in the mapping table memory by comparing the MT_ID signal of the fractional byte of its output to the MAC address area request information receiver and the MT_ID signal in the mapping memory. (MT_ID) comparator; When the input signal A from the MT_ID is low, the MT_A value is stored. When the output signal Sig_A of the MT_ID becomes high, the MT_A value is stored after storing the MT_A value regardless of the input signal. A MAC address area MT_A storage for outputting a value Sig_B; A virtual path identifier (VPI) request unit for transmitting the MT_ID information and the MT_A information together to an ATM switch; Receiving the VPI information from the ATM switch and outputting the VPI value, when the information receiving receives the drive signal (ST_B) for driving the memory address generator to high, the output signal (Addr) of the memory address generator has a corresponding MT_A A VPI receiving unit for pointing an address; The MT_ID information and the VPI information are stored in a mapping memory table, and the MT_ID, MT_A, and MT_A information transmitted to the MT_A transmitter are transmitted to a mobile terminal requesting MT_A allocation. Mobile device and service identifier allocating device, characterized in that for assigning a MAC address. For allocating a mobile terminal identifier for identifying a plurality of mobile terminals and identifying a service type for each terminal in a wireless ATM LAN system, A wireless receiver and a wireless transmitter for transmitting and receiving data signals through a wireless channel; A channel request information receiver configured to receive a signal from the wireless receiver, store VCI channel allocation request information from a mobile terminal, output a VCI signal as an output thereof, and generate a driving signal (ST_A) to drive a memory address generator; A memory address generator receiving the driving signal ST_A and outputting an address signal to read a mapping memory; A mapping table memory for outputting A, MVCI, and VCI signals of a corresponding area according to the address signal; A VCI comparator for comparing an output VCI signal of the channel request information receiver and a VCI signal among Sig_B signals including the A and VCI signals to determine whether the same VCI is already stored in the mapping table memory; An MVCI storage unit storing an MVCI value when the A signal of the corresponding region is low and storing the MVCI value regardless of the value of the input signal A when the output signal of the VCI comparator becomes high; A memory address generator for storing a valid MVCI value and receiving an output MVCI signal of the stored MVCI store and generating an output address signal of a memory address generator indicating an address having a corresponding MVCI; A mobile terminal and a service identifier, comprising: a wireless transmitter for transmitting the MVCI and VCI information to a mobile station requesting channel allocation after transmitting the MVCI and VCI information to the mobile station; Allocator.