JP2922490B1 - Wireless communication system and mobile station - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a service class required when a mobile station originates an ATM call by previously knowing an ATM service class supported by a base station and a service quality that can be provided at that time. If the required service quality is not available or the required service quality cannot be ensured, the call operation is not performed and the frequency resources are not wasted. SOLUTION: When a mobile station is notified of an ATM service class supported by a radio base station by a broadcast channel from the radio base station, a service class information acquisition unit 2 is provided.
02 is stored. Also, the ATM application 204
, The call processing unit 207 compares the ATM service class of the call to be called with the information on the presence / absence of support for each service class in the stored wireless section. If is not supported, the call processing is stopped. If supported, the call processing is continued.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system in which a single radio base station can accommodate a plurality of mobile stations at the same time.

[0002]

2. Description of the Related Art As a conventional technique, for example,
There is a conventional “method of reporting regulation information in a mobile radio communication system” shown in 1371. FIG. 17 is a flowchart showing the operation of the radio base station according to the prior art, and FIG.
5 is a flowchart showing the operation of the mobile station according to the conventional technique. First, the operation of the wireless base station will be described. In FIG. 17, the radio base station is in the normal control state (step
From S1701), for example, it is periodically checked whether all information channels (TCH) are in use (step S1702). If all are in use, the information of "all TCH in use" is set in the regulation information notification message (Step # 1703). On the other hand, free TC
If there is an H, the control information notification message indicates “empty TC
The information of "H exists" is set (step S1704). These regulation information broadcast messages are broadcast to each mobile station on the broadcast channel (BCCH) (step S1705), and return to the normal control state (step S1706).

Next, the operation of the mobile station will be described. In FIG. 18, for example, a mobile station that is a certain car phone is
When the power is turned on (step S1801), first, a slot transmitted by the base station having the best wireless communication condition is searched for (step S1801).
2) Receive information at the timing when the information channel (BCCH) in it is transmitted. Then, the contents of the regulation information notification message among the notification messages are determined (step S180).
3). At this time, the base station sends a
If the information that "there is a vacant information channel (TCH) slot" is set, the mobile station immediately confirms this.

[0004] Further, the mobile station is provided with an individual cell channel (S
(CCH), a link channel establishment request message is transmitted to the base station, and a link channel assignment message can be received as a response from the base station, and location registration is performed (step S1804). When transmitting, a link channel establishment request message is transmitted on the dedicated cell channel (SCCH), and when a link channel assignment message is received from the base station as a response, transmission can be performed (step S1805).

[0005] However, if the information indicating that the base station is using all information channel (TCH) slots is set in the regulation information notification message, the mobile station that has immediately confirmed that the base station has received 2 information at this time. A search is made for a slot transmitted by a base station having a good wireless communication state (step S1802), and information is received at the timing when the information channel (BCCH) among the slots is transmitted. Then, the content of the regulation information notification message among the notification messages from the second base station is determined (step S1803).

[0006] Therefore, the second base station transmits a "free information channel (TC
H) that there is a slot ", the mobile station immediately confirms this. Then, the mobile station transmits a link channel establishment request message to the base station on the dedicated cell channel (SCCH), and performs location registration upon receiving a link channel assignment message from the base station without fail (step S1804). When transmitting, a link establishment request message is transmitted on the dedicated cell channel (SCCH), and when a link channel assignment message is received as a response from the second base station, transmission (step S1) is performed.
805).

[0007] However, if the second base station also sets the information that "all information channel (TCH) slots are in use" in the regulation information notification message, the mobile station immediately confirms the information. Searches for a slot to be transmitted by the base station having the third best wireless communication state at this time (step S1802), and receives information at a timing at which the broadcast channel (BCCH) is transmitted. Below, 4th, 5th
This sequence is repeatedly performed for the th base station.

Next, the effects will be described. The base station
Since information indicating that "all information channel (TCH) slots are in use" can be transmitted in advance, the mobile station can immediately confirm the information without transmitting a link channel establishment request message to this base station. Therefore, if all of the information channel slots of the base station with the best wireless communication condition are in use, the next call is made to the base station with the best wireless communication condition and the base station having an empty information channel slot. You can register the location. Therefore, unnecessary transmission processing of the link channel establishment request message can be eliminated. Further, by eliminating this transmission processing, the time required for transmission or location registration can be reduced.

[0009] Here, the "link channel establishment request message" means that a mobile station that intends to register a location or make a call,
This is a message requesting the wireless base station to allocate a channel (link channel) for transmitting and receiving a wireless management message, a call control message, and the like. If the slot is vacant, the radio base station notifies the mobile station of the slot position to be assigned and the like using the “link channel assignment message”.

[0010] The above-mentioned conventional example is based on the premise that the slot allocated for making a call is continuously used during a call. It is also assumed that the number of slots required for a call is at most one, which is the same as the number of slots required for calling.

On the other hand, in the third generation of the second generation cordless telephone system (RCR STD-28), it is possible to allocate one slot to a link channel for calling and two slots to a communication channel for actually communicating. is there. 6
The purpose is to support 4 kbps data communication. The number of slots in the communication phase is requested by a call setup message from the mobile station. In this system, "multi-slot number" indicating the number of time slots that can be simultaneously used by a radio base station for one call is defined as one piece of broadcast information. The radio base station dynamically changes the “number of multi-slots” and notifies the mobile station of this,
The mobile station can determine whether or not two slots can be requested.

By the way, a broadband ISDN (Integrated Sequential
ATM has been attracting attention as a mainstream technology of rvice Digital Network). ATM is suitable for multimedia communication and has a feature that transmission quality can be set according to the type of data. Transmission quality is called "service class", and includes CBR (Constant Bit rate),
rt-VBR (real time Variable Bit Rate), nr
t-VBR (non real time Variable Bit Rate), A
BR (Available bit Rate), UBR (Unspecified Bi
t Rate) are defined.

FIG. 19 shows an outline of each service class.
The CBR is suitable for transmission of audio data or moving image data in which a fixed band is always allocated and a bit string needs to be constantly transmitted. VBR is a service class in which a guaranteed bandwidth can be set by changing the speed. Rt-VBR guarantees real-time performance, and nrt-VBR does not guarantee real-time performance.
It is. ABR supports flow control, unlike CBR and VBR.

The ABR uses a special cell for flow control called an RM (Resource Management) cell to check whether or not congestion has occurred.
Tell the TM switch. The terminal or the switch adjusts the data transmission amount based on the information of the RM cell to realize the flow control. UBR is a service class that does not guarantee anything, and is a best-effort data communication like a conventional IP network.

For each "service class", there are two types of parameters for expressing more detailed quality, a parameter indicating traffic characteristics of communication data and a parameter required for an ATM network. FIG. 20 shows an outline of these parameters. These are collectively called service parameters.

The parameter representing the traffic characteristics is PC
R (peak cell rate), SCR (sustainable cell rate),
MCR (minimum cell rate), MBS (maximum burst si
ze) and CDVT (cell delay variation tolerance). The maximum cell transfer rate is PCR and the average is S
The minimum value of CR and MCR is MCR, MBS is the maximum density of cells entering the network, and CDVT is the allowable value of cell transfer fluctuation.

The parameters required for the ATM network include CDV (cell delay variation) and CLR (cell loss variation).
rate), CTD (cell transmission delay), CER (ce
ll error rate). CDV is cell transfer fluctuation, CL
R indicates a cell loss rate, CTD indicates a cell transfer delay, and CER indicates a cell transfer error rate.

In order to achieve a desired service quality,
The ATM terminal describes the characteristics of the data to be communicated by using traffic parameter values, and allocates a service class accordingly. The parameters used differ depending on the service class. This is shown in FIG. When the traffic requirements are clarified, the ATM network determines whether a new connection satisfying the requirements can be set in view of the current line resource situation.

This judgment method is not standardized, and AT
Actually, it is a proprietary specification of the M equipment vendor.

Generally, service classes include CBR, VB
Priorities are assigned in the order of R, ABR, and UBR. CBR
, A fixed bandwidth is secured when a connection is set, and the bandwidth is guaranteed until the connection is released. Also, when calling,
If there is no empty band, it is also possible to use the band allocated to ABR and UBR.

When a new VBR connection is set, an empty band or a band used by ABR and UBR is allocated.
During the connection setting, the band dynamically changes, so that the empty band and the band allocated to ABR and UBR can be used.

ABR guarantees MCR, so new ABR
When the R connection is set, if there is an empty band or a band allocated to the UBR for the MCR, it can be accepted. During the connection setting, the band can be freely changed within the free band.

Since a UBR is not guaranteed, when a new UBR connection is set up, it is accepted unconditionally if the UBR service class is supported. During the connection setting, the band can be freely changed within the free band.

Since ABR and UBR are best-effort types, they have lower priority than CBR and VBR. Therefore, CB
When setting R connection or VBR connection, or VBR
When the bandwidth of the connection is dynamically increased, ABR, UBR
Bandwidth is reduced.

In recent years, attempts have been made to transmit ATM cells by radio. For example, 1996
IEICE General Conference B-544 "Broadband Wireless Access System". Such a system is referred to as a wireless ATM system.

FIG. 22 is a configuration diagram showing a configuration example of a wireless ATM transmission device. In FIG. 22, reference numeral 2201 denotes a radio base station connected to the ATM switching network for transmitting and receiving ATM cells to and from a mobile station by radio, 2202 denotes a baseband unit provided in the radio base station 2201, and 2203 denotes a baseband unit provided in the radio base station 2201. The radio unit 2204 is a call control unit provided in the radio base station 2201.
05 is a radio channel control unit provided in the radio base station 2201, 22
Reference numeral 11 denotes a mobile station A for transmitting / receiving an ATM cell to / from a radio base station by radio, 2212 denotes a radio unit provided in the mobile station A 2211, 2213
Is a baseband unit provided in the mobile station A 211, 2214 is a radio control unit provided in the mobile station A 2211, 2215 is a mobile station A 22
11, a call processing unit provided in 11, 2216 an ATM application provided in the mobile station A2211, 2221 a mobile station B for transmitting and receiving ATM cells to and from the radio base station by radio, and 2222 provided in the mobile station B2221. Radio section, 2223 is a baseband section provided in mobile station B2221, 2224 is a radio control section provided in mobile station B2221, 2225 is a call processing section provided in mobile station B2221, 2226 is a mobile station AT provided in B2221
The M application 2230 is an ATM switching network.

Next, the operation will be described. Wireless base station
At 2201, the ATM cells received from the ATM switching network 2230 are separated for each mobile station and transmitted to each slave station via the baseband unit 2202 and the radio unit 2203. Also, the wireless unit 2203
The information received from each mobile station through the network is multiplexed and transmitted to the ATM switching network 2230. In the mobile station A2211, the radio unit
The ATM cell received from the wireless base station 2201 via the baseband unit 2213 is notified to the ATM application 2216. The ATM cell received from the ATM application 2216 is transmitted to the wireless base station 2201 through the baseband unit 2213 and the wireless unit 2212. The operation of the mobile station B 2221 is the same as that of the mobile station A 2211. Note that the direction from the mobile station to the radio base station is called an up direction, and the direction from the radio base station to the mobile station is called a down direction.

In information transmission using radio, it is important to effectively use a frequency band which is a finite resource. When one radio base station accommodates a plurality of mobile stations, a method is generally used in which a plurality of mobile stations divide and access the same frequency in the time axis direction. This method is applied to TDMA (Time Di
vision Multiple Access). Furthermore, the same frequency is shared by time division in the uplink and downlink directions in a TDD (Time
Division Duplex) system.

FIG. 23 shows an example of a TDMA / TDD frame format in a radio section between a radio base station and a mobile station.
It is a DMA frame format figure. In FIG. 23, reference numeral 2301 denotes a TDMA frame; 2302, a broadcast channel by which the radio base station broadcasts broadcast information to the mobile station;
03 is a random access channel that the mobile station randomly accesses when setting a radio channel, 2304 is a control channel for transmitting and receiving radio channel control information between the radio base station and each mobile station, and 2305 is a radio channel. A user channel for transmitting and receiving user information between the base station and each mobile station.

The user channel 2305 can be dynamically allocated to each mobile station in the uplink direction according to the transmission rate. Also, in the downlink direction, it is possible to dynamically assign to each mobile station from the ATM network according to the transmission rate. It is up to the radio base station to determine how many uplink and downlink user channels to allocate to each mobile station.

FIG. 24 is a configuration diagram showing a configuration of a baseband unit, a radio channel control unit, and a call control unit of the conventional radio base station. In FIG. 24, 2401 is a baseband unit of the wireless base station, 2402 is a call control unit of the wireless base station, 2403 is a wireless channel control unit of the wireless base station, 2404 is a call admission control unit in the call control unit, Reference numeral 2405 denotes a slot assignment unit in the radio channel control unit.

FIG. 25 is a configuration diagram showing a configuration of a baseband unit, a radio control unit, and a call processing unit of this conventional mobile station.
In FIG. 25, reference numeral 2501 denotes a baseband unit of the mobile station;
02 is a call processing unit of the mobile station, 2503 is a radio control unit of the mobile station, 2504 is an ATM application of the mobile station, 2505
Is a call processing unit in the call control unit.

Next, the operation will be described. Mobile station A
When the TM application 2504 attempts to make a call, it first requests the call processing unit 2505 in the call processing unit 2502 to make a call. The call request includes the requested "ATM service class" and "service parameters".
The call processing unit 2505 generates a call control message, the baseband unit 2501 converts the call control message into ATM cells, and transmits the ATM cells to the wireless base station 2201 through the wireless unit.

The baseband unit 2401 of the radio base station 2201 separates the ATM cell carrying the call control message, converts it into a call control message, and notifies the call control unit 2402 of it. FIG. 26 shows an outline of the operation of the call admission control unit 2404 in the call control unit 2402. In FIG. 26, the "ATM service class" or "service parameter" requested by the mobile station is compared with the slot use status in the TDMA frame to determine whether the call can be accepted. If it is determined that the call can be accepted, a call control message is further transmitted to the ATM network. If it is determined that reception is not possible, the mobile station is notified that reception is not possible. In this case, the call is lost.

[0035]

As described above, in the conventional radio communication system, only information indicating whether there is an empty slot in a TDMA frame or whether a mobile station can request a plurality of slots is transmitted by radio. The base station reports to the subordinate mobile station, and the ATM service class supported by the base station, which is necessary for the radio ATM system to determine the call acceptance, has not been reported to the subordinate mobile station. Therefore,
Even if the link channel required for call setup is successfully secured, the mobile station cannot know the ATM service class supported by the base station in advance. If the required service class is not supported by the base station, it is rejected, the call operation becomes useless, and the frequency resources are wasted.

In a conventional wireless communication system, TD
The radio base station notifies the subordinate mobile station of only information indicating whether there is an empty slot on the MA frame or whether the mobile station can request a plurality of slots.
An ATM service parameter indicating the service quality that can be provided by the base station at that time, which is necessary for the TM system to determine the call acceptance, has not been notified to the subordinate mobile station. Therefore, even if the link channel required for the call setup is successfully secured, the mobile station cannot make an ATM call because the mobile station cannot know in advance the ATM service parameters indicating the service quality that can be provided by the base station. If the required service quality cannot be ensured even if the call is made, the service is rejected, the calling operation becomes useless, and the frequency resources are wasted.

The present invention has been made to solve the above-described problems, and is intended to solve the above problems.
If the mobile station can know the M service class in advance and the service class required when the mobile station makes an ATM call is not supported by the base station, the mobile station does not perform the call operation and wastes frequency resources. The purpose is not to.

Further, when the mobile station can know in advance the ATM service parameters indicating the service quality that can be provided by the base station, and the mobile station cannot secure the required service quality when making an ATM call. The object of the present invention is to perform no calling operation and not waste frequency resources.

[0039]

A wireless communication system according to a first aspect of the present invention includes a wireless communication system including a wireless base station and at least one mobile station connected to the wireless base station, and capable of performing ATM transmission. The wireless base station is an ATM
A means for periodically notifying the mobile station of broadcast information indicating whether or not each service class is supported by using a broadcast channel, wherein the mobile station receives broadcast information from the radio base station. Broadcast information receiving means to be stored, an ATM service class of a call to be called when the local station originates a call, and a service class of the radio base station extracted from the broadcast information stored in the broadcast information receiving means If the radio base station does not support the ATM service class of the call to be called, the call processing is stopped. Call control means for continuing the processing.

A radio communication system according to a second invention comprises a radio base station and at least one mobile station connected to the radio base station. The radio base station periodically transmits broadcast information including information indicating whether or not each ATM service class supports the ATM service class and the number of slots that can be used in the wireless section to the base station using a broadcast channel. The mobile station periodically receives broadcast information from the radio base station and stores the broadcast information, and a call to be called when the mobile station itself calls. ATM service class, information on the presence / absence of support for each service class of the radio base station extracted from the broadcast information stored in the broadcast information receiving means, and use in the wireless section. Possible by comparing the number of slots,
If the radio base station does not support the ATM service class of the call to be called, and if the radio base station supports the ATM service class, the required number of slots exceeds the number of available slots In this case, there is provided a call control means for stopping the call processing and otherwise continuing the call processing.

A wireless communication system according to a third aspect of the present invention is a wireless communication system including a wireless base station and at least one mobile station connected to the wireless base station and capable of performing ATM transmission. Transmits broadcast information including information on whether or not each ATM service class supports the service class and acceptable service parameter values for each service class obtained from the number of slots available at that time in a wireless section, A broadcast station for periodically broadcasting the broadcast information to the mobile station using a broadcast channel, wherein the mobile station periodically receives the broadcast information from the radio base station and stores the broadcast information; When a call is made, the ATM service class of the call to be called and the service parameter values for each requested service class;
The radio base station compares the presence / absence information of support for each service class of the radio base station extracted from the broadcast information stored in the broadcast information receiving means with an acceptable service parameter value for each service class. When the ATM base station does not support the ATM service class of the call to be called, and when it is determined that the radio base station does not satisfy the service parameter value for each requested service class even if the base station supports the ATM service class, , A call control means for suspending the call processing, and otherwise continuing the call processing.

A radio communication system according to a fourth invention is the radio communication system according to any one of the first to third inventions, wherein the mobile station receives broadcast channels of a plurality of radio base stations. If it is possible, the broadcast information broadcast from the wireless base station having the best wireless channel condition is stored in the broadcast information receiving means. Broadcast information broadcast from a radio base station having a good line condition is stored in the broadcast information receiving means, and the call control means is re-determined to suspend or continue the calling process.

A wireless communication system according to a fifth aspect of the present invention is the wireless communication system according to any one of the first to third aspects, wherein the call control means suspends the call processing. In this case, there is provided a call waiting means for waiting for a call for a predetermined delay time and a call means for retrying the call processing after the delay time has elapsed. A mobile station according to a sixth aspect of the present invention is a mobile station that performs ATM transmission via a wireless base station that periodically broadcasts broadcast information including an ATM service class supported by the mobile station. Information receiving means for periodically receiving and storing broadcast information broadcasted from the ATM, an ATM service class of a call to be called when the local station originates a call, and broadcast information stored in the broadcast information receiving means. Is compared with the ATM service class supported by the wireless base station extracted from the above. If the wireless base station does not support the ATM service class of the call to be called, the calling process is stopped. It is provided with call control means. Further, the mobile station according to the seventh aspect of the present invention is provided via a radio base station that periodically broadcasts broadcast information including an ATM service class supported by the own station and the number of slots available at that time in a wireless section. Broadcast information receiving means for periodically receiving and storing broadcast information broadcast from the radio base station in a mobile station performing ATM transmission, and an ATM of a call to be called when the local station originates a call. Comparing the service class and the required number of radio slots with the ATM service class supported by the radio base station extracted from the broadcast information stored in the broadcast information receiving means and the number of slots available in a wireless section, If the radio base station does not support the ATM service class of the call to be made,
Alternatively, a call control means for stopping the call processing when the number of radio slots required by the call to be called exceeds the number of usable slots. Further, the mobile station according to the seventh aspect of the invention includes an ATM service class supported by the mobile station and a receivable service parameter value for each service class obtained from the number of slots available at that time in the radio section. In a mobile station that performs ATM transmission via a wireless base station that periodically broadcasts broadcast information, a broadcast information receiving unit that periodically receives and stores the broadcast information broadcast from the wireless base station, and a local station transmits the broadcast information. When making a call, the ATM service class supported by the radio base station extracted from the ATM service class of the call to be called and the service parameter value for each requested service class and the broadcast information stored in the broadcast information receiving means. The radio base station compares the acceptable service parameter values for each class and service class, and attempts to make the call. If the call does not support the ATM service class, or if the service parameter value for each service class required by the call to be called cannot be satisfied, the call control means for stopping the call processing is provided. .

[0044]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a part of a radio base station (baseband unit, radio line control unit, call control unit) showing one embodiment of a radio communication system according to the present invention.
FIG. FIG. 2 is a configuration diagram showing a part of a mobile station (baseband unit, radio control unit, call processing unit) connected to the radio base station of FIG. The configuration diagram of FIG. 22 is used not only in this embodiment but also in the following embodiments. In FIG. 1, 101 is a baseband unit, 1
02 is a radio channel control unit, 103 is a call control unit, 104 is an information notification unit inside the baseband unit 101, 105 is a service class information setting table inside the radio channel control unit 102, and 106 is a call control unit 1.
03 Internal call admission control unit.

In FIG. 2, 201 is a baseband unit, 202 is a radio control unit, 203 is a call processing unit, 204 is an ATM application, 205 is a broadcast information storage unit inside the baseband unit 201, and 206 is a radio control unit. A service class information acquisition unit 202 inside the call processing unit 203 is a call processing unit inside the call processing unit 203.

Hereinafter, the operation of the radio base station will be described first. ATM service classes supported by the wireless base station are registered in the service class information setting table in advance. FIG. 3 shows an example of the service class setting table. In FIG. 3, the CBR class and the UBR
Class is supported, but rt-VBR, nrt-
This indicates that the VBR class and the ABR class are not supported. The information notification unit 104 reads the service class information registered in the service class information setting table 105, and periodically notifies the information using a notification channel in the TDMA frame.

Next, the operation of the mobile station will be described. In FIG. 2, a broadcast information storage unit 205 sequentially stores broadcast information periodically broadcast from the radio base station. The service class information acquisition unit 202 acquires the service class information from the broadcast information storage unit 205 when there is a request from the call processing unit 207, and notifies the call processing unit 207. The operation of the call processing unit 207 will be described with reference to FIG.

When a call request is issued from the ATM application 204 (step S401), the call processing unit 207 requests the service class information acquisition unit 206 to acquire an ATM service class supported by the radio base station. (Step S402), and obtain the service class (Step S402).
403). The service class obtained from the service class information acquisition unit 206 is compared with the service class required by the call to be called (step S404), and if the radio base station supports this service class, (Step S405). If the radio base station does not support this service class, the ATM application is notified of the call failure with a reason indicating that the radio base station does not support this service class.
(Step S406).

[0049] Not all radio base stations support the ATM service classes required by mobile stations. For example, CBR service class and UB with simple control
A radio base station that supports only the R service class can be considered.

As described above, by receiving the broadcast information, the mobile station can know in advance whether or not the call is rejected by the radio base station due to the non-support of the ATM service class. No more,
There is an effect that the wireless line can be used effectively.

Embodiment 2 FIG. 5 is a part of a radio base station showing another embodiment of the radio communication system according to the present invention.
FIG. 3 is a configuration diagram of a (baseband unit, a radio channel control unit, a call control unit). FIG. 6 is a configuration diagram showing a part of a mobile station (baseband unit, radio control unit, call processing unit) connected to the radio base station shown in FIG. In FIG. 5, reference numeral 501 denotes a baseband unit, 502 denotes a radio channel control unit, 503 denotes a call control unit,
Is an information notification unit in the baseband unit 501, 505 is a service class information setting table in the wireless channel control unit 502, 506
Is a usable slot number calculation unit inside the radio channel control unit 502, 507 is a slot allocation unit inside the radio channel control unit 502,
Reference numeral 508 denotes a call reception control unit inside the call control unit 503.

In FIG. 6, reference numeral 601 denotes a baseband unit, 602 denotes a radio control unit, 603 denotes a call processing unit, 604 denotes an ATM application, 605 denotes an information notification unit inside the baseband unit 601, and 606 denotes a radio control unit 602. An internal service class information acquisition unit, 607 is an available slot number acquisition unit inside the wireless control unit 602, and 608 is a call processing unit inside the call processing unit 603.

Hereinafter, the operation of the radio base station will be described first. As described in the first embodiment, information indicating whether or not this radio base station supports each ATM service class is registered in the service class information setting table in advance. The slot allocator is a TDMA
A process of allocating each slot in the user channel of the frame to the mobile station is performed. When a new call is set up for a certain mobile station, or when the communication rate of a certain connection increases, slots are allocated, and when a call is released or the communication rate decreases, slots are allocated. Release of. In a mobile radio communication system, this is a generally necessary processing unit.

The call admission control unit 508 performs the call admission control shown in the prior art. Usable slot number calculator 5
In step 06, the number of slots that can be allocated to a new call is determined from the user slot allocation information from the slot allocation unit 507.

FIG. 7 shows a usable slot number calculating section 506.
3 is a flowchart showing an outline of the operation of FIG. Next, the operation of the usable slot number calculation unit 506 will be described with reference to FIG. This operation is started periodically (step S701), the number of slots available for a new call is obtained (step S702), stored in the information notification unit 504 (step S703), and then returns to the normal operation.
(Step S704).

FIG. 8 is a TDMA frame configuration diagram showing the positions of "usable slots" on the TDMA frame. In this figure, a user channel 805 is an ATM.
The service class is divided and used for each service class. The area for the CBR service class occupies a fixed number of slots and does not change except at the time of call setup and call release.

On the other hand, the area for the VBR service class dynamically changes with a certain width. The minimum is 0 slots, and the maximum is the number of slots required to accommodate the sum of PCRs of the accommodated VBR connections (however, VBR connection
Since a statistical multiplexing effect can be expected between connections of a service class, the SBR of all VBR connections is substantially
Between the sum of the CR values and the sum of the PCR values, the number of slots required to accommodate the stochastically determined transmission rate value can be the "maximum number of slots".

In the area of the ABR and UBR service classes, slots other than the slots used by the CBR and VBR service classes are used. Note that the area of the ABR and UBR service classes also changes with the dynamic change of the VBR service class area. "Available Slots"
Is a slot in which calls of any service class can be used without restriction. Since the ABR and UBR areas have low priority, they can be used in all service classes.
When the maximum slot of the service class is used, ABR, U
The BR service class area is reduced. Therefore, the “usable slot” is the portion shown in FIG.

If there are empty slots that are not assigned to any service class, they can also be incorporated as “usable slots”. The information notification unit 504 obtains the “service slot number” from the service class registered in the service class information setting table 505 and the available slot number calculation unit 506.
And broadcasts this information to all subordinate mobile stations using the broadcast channel in the TDMA frame.

Next, the operation of the mobile station will be described. The broadcast information storage unit 605 sequentially stores broadcast information broadcast periodically (for example, in a TDMA frame cycle) from the wireless base station. Upon receiving a request from the call processing unit 608, the service class information obtaining unit 606 obtains service class information from the broadcast information storage unit 605 and notifies the call processing unit 608. Upon receiving a request from the call processing unit 608, the available slot number obtaining unit 607 obtains the “number of available slots (SN accp)” from the broadcast information storage unit 605 and notifies the call processing unit 608.

Next, the operation of the call processing unit 608 will be described with reference to FIG. When a call request is issued from the ATM application 604 (step S901), the call processing unit 6
08 requests to acquire service class information indicating whether or not the radio base station supports each service class, and acquires this service class information (step S9).
02). The service class information obtained from the service class information acquisition unit 606 is compared with the service class required by the call to be called (step S903), and it is detected that the radio base station does not support this service class. If so, the ATM application is notified of the call failure along with a reason indicating that the radio base station does not support this service class (step S904). If the wireless base station detects that the service class is supported, the process branches for each service class (step S90).
Five).

In the case of the CBR service class, the “available slot number” is obtained from the available slot number acquisition unit 607.
(SN accp) is obtained (step # S906). Next, the number of slots (SN req) required to accommodate the PCR requested from the ATM application 604 is determined (Step # S907). Finally, SN accp and SN req are compared (Step S908), and SNac
If the value of cp is larger, the call setting process is continued (step S90
9). If the value is smaller, the call setting process is stopped, and a call setting failure is notified together with a reason indicating that the number of slots required for the ATM application cannot be secured (Step # S904).

The same processing is performed for the VBR service class. However, since a statistical multiplexing effect can be expected between connections of the VBR service class, it is practically necessary to accommodate a transmission rate value that is stochastically obtained between the SCR value and the PCR value required by the connection. It is also possible to set the required number of slots to “the required number of slots (SN req)”.

In the case of the ABR service class, it is necessary to secure a minimum cell rate (MCR).
The number of slots (SN req) necessary for accommodating this is obtained (step S914), compared with SN accp (step S915), and SN accp
Is larger, the call setting process is continued (step S90).
9). If the value is smaller, the call setting process is stopped, and a call setting failure is notified together with a reason indicating that the number of slots required for the ATM application cannot be secured (Step # S904). U
In the case of the BR service class, the call setting process is unconditionally continued (step S909).

As described above, the mobile station receives the broadcast information from the radio base station, so that the mobile station supports A
Since the number of available slots can be known in advance in addition to the TM service class, even if the service class is supported, a sufficient slot in a wireless section cannot be secured, resulting in a wasteful call setting. There is an effect that calling is eliminated and the wireless line can be used more effectively.

Embodiment 3 FIG. 10 is a part of a radio base station showing another embodiment of the radio communication system according to the present invention.
FIG. 3 is a configuration diagram of a (baseband unit, a radio channel control unit, a call control unit). FIG. 11 is a configuration diagram showing a part of the mobile station (baseband unit, radio control unit, call processing unit). FIG.
In 0, 1001 is a baseband unit, 1002 is a radio channel control unit, 1003 is a call control unit, 1004 is an information notification unit inside the baseband unit 1001, 1005 is a service class information setting table inside the radio channel control unit 1002, 1006 Is the wireless line controller 1002
An internal parameter calculation unit, 1007 is a slot allocation unit inside the radio channel control unit 1002, and 1008 is a call admission control unit inside the call control unit 1003.

In FIG. 11, reference numeral 1101 denotes a baseband unit; 1102, a radio control unit; 1103, a call processing unit;
M application, 1105 is a broadcast information storage unit inside the baseband unit 1101, 1106 is a service class acquisition unit inside the radio control unit 1102, 1107 is a parameter information acquisition unit inside the radio control unit 1102, and 1108 is a call information unit inside the call processing unit 1103. Outgoing call processing unit.

Hereinafter, the operation of the radio base station will be described first. In the service class information setting table 1005,
As described in the first embodiment, the ATM service class supported by the wireless base station is registered in advance. The slot allocating unit 1007 allocates each slot in the user channel of the TDMA frame to the mobile station. When a new call is set up for a certain mobile station, or when the communication rate of a certain connection increases, slots are allocated, and when a call is released or the communication rate decreases, slots are allocated. Release of. In a mobile radio communication system, this is a generally necessary processing unit.

The call admission control unit 1008 performs the call admission control shown in the prior art. Parameter calculator 1006
Performs a process of obtaining an ATM service parameter for each service class from the number of available slots in addition to the process of the available slot number calculation unit described in the second embodiment. FIG.
2 shows the operation of the parameter calculation unit 1006.

Next, the operation of the parameter calculator 1006 will be described with reference to FIG. This operation is periodically started (Step S1201), and the number of slots available for a new call is obtained (Step S1202). Next, processing is performed for each service class, such as CBR, VBR, and ABR.

In the CBR service class, the number of available slots (SN accp) is converted into a transmission rate, and an acceptable PCR (PCR accp) is obtained (step S1203). PCR
The accp is set in the information notification unit (Step S1204).

The same processing is performed for the VBR service class. However, since a statistical multiplexing effect can be expected between connections of the VBR service class, a value substantially exceeding the value converted into the transmission rate is statistically obtained and the acceptable P
It can be CR (PCR accp). further,
An acceptable SCR (SCR accp) can also be determined statistically.

In the ABR service class, the minimum acceptable cell rate (M) is determined based on the number of available slots (SN).
CR accp) (Step # S1207). The MCR accp is set in the information notification unit 1004 (step S1208).

Finally, the operation returns to the normal operation (Step S1209).

The information notification unit 1004 reads these service classes registered in the service class information setting table 1005 and each service parameter for each service class calculated by the parameter calculation unit 1006, and sets the notification channel in the TDMA frame. Use to signal information.

Next, the operation of the mobile station will be described. The broadcast information storage unit 1105 stores broadcast information periodically broadcast from the wireless base station. Service class information acquisition unit 1
When receiving a request from the call processing unit, the call unit acquires service class information from the broadcast information storage unit 1105 and notifies the call processing unit 1108 of the service class information. Also, the parameter acquisition unit 110
7, when there is a request from the call processing unit 1108, the service parameter information is acquired from the broadcast information storage unit 1105 and notified to the call processing unit.

FIG. 13 is a flowchart showing the operation of the call processing unit 1108. Next, the operation of the call processing unit 1108 will be described with reference to FIG. Call processing unit 110
8 receives a call request from the ATM application 1104 (Step S1301), first obtains service class information indicating whether or not the radio base station supports each service class from the service class information obtaining unit 1106 (Step S1301). (S1302), check whether the requested service class is supported by the radio base station (step S1303), and if not, stop the reception process and notify the ATM application that the call setting has failed (step S1302). S1304). If the radio base station supports the requested service class, the process branches for each service class (Step S1305)
I do.

If the service class is CBR, the accepted peak cell rate (PCR accp) is obtained from the parameter acquisition unit 1107 (step # S1306). Next, AT
The PCR value (PCR req) requested from the M application 1104 and the obtained PCR accp are compared (step S1
307), if the PCR accp is small, stop the reception process and notify the application that the call setup has failed (step 307).
S1304). If it is larger, the call setting process is continued, and a call setting request is sent to the radio base station (step S1308).

If the service class is VBR, an acceptable peak cell rate (PCR accp) is obtained from the parameter acquisition unit 1107 (step # S1309). Next, ATM
The PCR value (P
CR req) and the obtained PCR accp (Step S1310),
If the PCR accp is small, the reception process is stopped and the AT
Notify M application 1104 of call setup failure
(Step S1304). If it is larger, the call setting process is continued, and a call setting request is sent to the radio base station (step S1308).

The average cell rate that can be accepted (SCR
accp) is also obtained from the parameter acquisition unit 1107, the SCR value requested from the ATM application
If SCR accp is smaller than (SCRreq),
It is also possible to take a form in which the reception processing is stopped and the application is notified of the failure of the call setting.

When the service class is ABR, the cell rate (MC
R accp) (Step # S1311). Next, the requested MC
The R value (MCR req) is compared with the obtained MCR accp (step S
1312) If the MCR accp is small, cancel the reception process,
Notify application of call setup failure (step S130
Four). If it is larger, the call setting process is continued, and a call setting request is sent to the radio base station (step S1308).

When the service class is UBR, since there is no need for quality assurance, the call setting process is unconditionally continued and a call setting request is sent to the radio base station (step S1308).

This embodiment is different from the second embodiment in that ATM service parameters are derived from the number of available slots in the radio base station. PCR, SC
It is also possible to take a form of broadcasting various service parameters other than R and MCR. For example, MBS (maximum burst size) and CDVT (cell dela
y variation tolerance) or CDV (cell delay variation) and CLR (cell loss r
ate), CTD (cell transmission delay), CER (cell e
rror rate) is reported on a broadcast channel.

As described above, by receiving the broadcast information, the mobile station can know in advance not only the ATM service class supported by the base station but also available service parameter values. Even if supported, sufficient bandwidth and service quality in the wireless section cannot be ensured, and unnecessary callouts such as eventually failing in call setup are eliminated, and the wireless line can be used more effectively. There is.

Embodiment 4 In the first, second, and third embodiments, when the request at the time of calling by the mobile station is determined to be unsatisfactory in comparison with the broadcast information from the radio base station, the failure of the calling is notified to the application. However, when there are a plurality of base stations around a mobile station and broadcast information can be received from them, a base station that satisfies the conditions may be found by sequentially receiving the broadcast information. Here, an embodiment in which the above function is applied to the first embodiment will be described. The configurations of the radio base station and the mobile station are the same as those shown in the first embodiment.

FIG. 14 is a flowchart showing the operation of the call processing unit of the mobile station according to this embodiment. Next, the operation of this embodiment will be described with reference to FIG. In addition,
11 and 12 are used for the configuration. When there is a call request from the ATM application 1104 (step S1401), the call processing unit 1103 first obtains broadcast information on the service class information of the base station having the best wireless channel state (step S1402, S1403). Then, it checks whether the service class of the call to be called is supported (step S1404). If it is supported, normal call processing is performed (step S1405). If it is not supported, the broadcast information of the base station having the next best wireless channel condition is obtained, and the conditions are compared. This is repeated until the condition is satisfied or the broadcast information of the wireless base station cannot be received.

As described above, since the broadcast information of a plurality of radio base stations is acquired and the conditions are compared, the probability of a call failure can be reduced as compared with the case where only one radio base station is targeted. .

Embodiment 5 In the first, second, and third embodiments, when it is determined that the call request from the mobile station cannot be satisfied based on the broadcast information from the wireless base station, the failure of the call is notified to the application. Since the broadcast information broadcast from the base station is dynamically changed, the condition may be satisfied by waiting. Here, an embodiment in which the above function is applied to the first embodiment will be described.

FIG. 15 is a configuration diagram showing the configuration of the mobile station in the above embodiment. 15, 1501 is a baseband unit, 1502 is a radio channel control unit, 1503 is a call processing unit, 1504 is an ATM application, 1505 is a broadcast information storage unit inside the baseband unit 1501, and 1506 is a radio control unit 1502
An internal service class acquisition unit, 1507 is a call processing unit inside the call processing unit 1503, and 1508 is a call retry unit inside the call processing unit 1503.

FIG. 16 is a flowchart showing the operation of the mobile station in this embodiment. Next, the operation of the mobile station in this embodiment will be described using FIG. The call processing unit 1503 is used for the ATM application 15
When a call request is made from step 04 (step S1601), broadcast information on the service class information of the radio base station is obtained (step 1602, S1603), and the service class of the call to be called is supported by the radio base station. It is checked whether it is (step S1604). If it is supported, normal call processing is performed (step S1605). If it is not supported, after waiting a predetermined delay time Td (step S1607), the broadcast information of the base station is acquired again (step S1607).
S1602, 1603), an attempt is made to compare the conditions (step S1604).

If it is determined that the predetermined time has elapsed (step S1606), the application is notified of the call failure (step S1608).

As described above, according to this embodiment,
In the mobile station, the call processing unit automatically retries the call until the call setup becomes possible. There is an effect that it can be reduced.

[0093]

According to the first and sixth aspects of the present invention, the mobile station receives the broadcast information from the radio base station, so that the call originates from the AT.
Since it is possible to know in advance whether or not rejection by the wireless base station due to the non-support of the M service class, it is possible to prevent an unnecessary call from being made and to use the wireless line effectively.

According to the second and seventh aspects of the present invention, the mobile station receives the broadcast information from the radio base station, so that the number of usable slots can be increased in addition to the ATM service class supported by the base station. Even if the service class is supported, it is not possible to secure a sufficient slot in the wireless section, so that unnecessary call such as a failure in call setting will not be made, and the wireless line will be improved. It has the effect that it can be used effectively.

According to the third and eighth aspects of the present invention, the mobile station receives the broadcast information from the radio base station, and thereby, in addition to the ATM service class supported by the base station, the usable service parameter value. Can be known in advance, so that even if the service class is supported, there is no need to make a wasteful call such that the call setup fails because sufficient bandwidth and service quality in the wireless section cannot be secured, This has the effect that the wireless line can be used more effectively.

Further, according to the fourth aspect, the mobile station acquires the broadcast information of a plurality of radio base stations and compares the conditions, so that the outgoing call can be made as compared with the case where only one radio base station is targeted. This has the effect of reducing the probability of failure.

According to the fifth aspect of the present invention, in the mobile station, the call processing unit automatically retries the call until the call setting becomes possible. As a result, it is possible to reduce the probability of a call failure.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a wireless base station according to Embodiment 1.

FIG. 2 is a block diagram showing a configuration of a mobile station according to the first embodiment.

FIG. 3 is a diagram showing a service class information setting table according to the first embodiment.

FIG. 4 is a flowchart showing an operation of a call processing unit of the mobile station according to the first embodiment.

FIG. 5 is a block diagram showing a configuration of a radio base station according to Embodiment 2.

FIG. 6 is a block diagram illustrating a configuration of a mobile station according to Embodiment 2.

FIG. 7 is a flowchart showing an operation of a usable slot number calculation unit in a radio base station according to the second embodiment.

FIG. 8 is a configuration diagram of a TDMA frame for indicating a position of an available slot according to the second embodiment.

FIG. 9 is a flowchart showing an operation of a call processing unit in a mobile station according to the second embodiment.

FIG. 10 is a block diagram illustrating a configuration of a wireless base station according to Embodiment 3.

FIG. 11 is a block diagram showing a configuration of a mobile station according to Embodiment 3.

FIG. 12 is a flowchart illustrating an operation of a parameter calculation unit in a radio base station according to Embodiment 3.

FIG. 13 is a flowchart showing an operation of a call processing unit in a mobile station according to the third embodiment.

FIG. 14 is a flowchart showing an operation of a call processing unit in a mobile station according to the fourth embodiment.

FIG. 15 is a block diagram showing a configuration of a mobile station according to Embodiment 5.

FIG. 16 is a flowchart showing operations of a call retry unit and a call processing unit in a mobile station according to the fifth embodiment.

FIG. 17 is a flowchart showing an operation of a radio base station according to a conventional technique.

FIG. 18 is a flowchart showing an operation of the mobile station according to the conventional technique.

FIG. 19 is a diagram showing types and outlines of service classes provided by ATM in a conventional technique.

FIG. 20 is a diagram showing types and outlines of parameters relating to traffic characteristics and quality in ATM in the related art.

FIG. 21 is a diagram showing a correspondence relationship between service classes and parameters in an ATM in a conventional technique.

FIG. 22 is a block diagram illustrating a configuration of a wireless ATM transmission device according to a conventional technique.

FIG. 23 is a diagram illustrating a configuration of a TDMA frame in a wireless section according to the related art.

FIG. 24 is a detailed configuration diagram of a radio base station according to the related art.

FIG. 25 is a detailed configuration diagram of a mobile station according to the related art.

FIG. 26 is a flowchart showing the operation of a call admission control unit in a wireless base station according to the conventional technique.

[Explanation of symbols]

101 baseband unit, 102 wireless line control unit, 1
03 call control unit, 104 information notification unit, 105 service class information setting table, 106 call admission control unit, 20
1 baseband unit, 202 wireless control unit, 203 call processing unit, 204 ATM application, 205 broadcast information storage unit, 206 service class information acquisition unit, 50
1 baseband unit, 502 wireless channel control unit, 503
Call control section, 504 information notification section, 505 service class information setting table, 506 usable slot number calculation section, 507 slot allocation section, 508 call admission control section, 601 baseband section, 602 radio control section, 6
03 Call processing unit, 604 ATM application, 60
5 broadcast information storage unit, 606 service class information acquisition unit, 607 usable slot number acquisition unit, 608 call processing unit, 1001 baseband unit, 1002 wireless channel control unit, 1003 call control unit, 1004 information broadcast unit, 1005 service Class information setting table, 10
06 parameter calculation unit, 1007 slot allocation unit, 1008 call admission control unit, 1101 baseband unit, 1102 radio control unit, 1103 call processing unit, 11
04ATM application, 1105 broadcast information storage unit, 1106 service class information acquisition unit, 1107
Parameter acquisition unit, 1108 call processing unit, 1501 baseband unit, 1502 service class information acquisition unit,
1503 call processing section 1504 ATM application, 1505 broadcast information storage section, 1506 radio control section, 1507 call processing section, 1508 call retry section, 2201 radio base station, 2202 baseband section, 2203 radio section, 2204 call control section, 2205
Radio channel control unit, 2211 mobile station A, 2212 radio unit, 2213 baseband unit, 2214 radio control unit, 2215 call processing unit, 2216 ATM application, 2221 mobile station B, 2222 radio unit, 22
23 baseband section, 2224 wireless control section, 222
5 Call processing unit, 2226 ATM application, 2
230 ATM switching network, 2401 baseband section, 2
402 call control unit, 2403 radio line control unit, 240
4 call admission control unit, 2405 slot allocation unit, 25
01 baseband section, 2502 call processing section, 2503
Wireless control unit, 2504 ATM application, 2
505 Call processing unit.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04Q 7/26 7/30 (56) References JP-A-59-89044 (JP, A) JP-A-9-18435 (JP, A) JP-A-5-227193 (JP, A) JP-A-10-308752 (JP, A) JP-A-6-77886 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) H04B 7/24-7/26 H04Q 7/00-7/38 H04L 12/00-12/22

Claims (8)

(57) [Claims] 1. A wireless communication system comprising a wireless base station and at least one mobile station connected to the wireless base station and capable of performing ATM transmission, wherein the wireless base station supports each ATM service class. A means for periodically notifying the mobile station of broadcast information indicating whether or not the mobile station is used, the mobile station receives broadcast information from the radio base station and stores the broadcast information, When the local station originates a call, the ATM service class of the call to be originated and information on the presence / absence of support for each service class of the radio base station extracted from the broadcast information stored in the broadcast information receiving means. In comparison, the radio base station
If the ATM service class of the call to be called is not supported, the call processing is stopped. If the ATM service class is supported, the call control means continues the call processing. Wireless communication system. 2. A radio communication system comprising a radio base station and at least one mobile station connected to the radio base station and capable of performing ATM transmission, wherein the radio base station supports each ATM service class. The mobile station further comprises: a broadcast unit configured to periodically broadcast the broadcast information including the information about whether the radio base station and the number of slots available in the radio section to the base station using a broadcast channel. A broadcast information receiving means for periodically receiving and storing broadcast information from the radio base station; an ATM service class of a call to be called when the local station originates a call; Notification information stored in the notification information receiving means
By comparing the number of support existence information and radio section odor can use Te slots for each service class of the radio base station and retrieved from broadcast, the radio base station is the call
If the ATM service class of the call to be supported is not supported, and if the required number of slots exceeds the number of available slots even if the radio base station supports the ATM service class, the call processing is stopped. And a call control means for continuing call processing in other cases. 3. A wireless communication system comprising a wireless base station and at least one mobile station connected to the wireless base station and capable of performing ATM transmission, wherein the wireless base station supports each ATM service class. period and whether the information, the notification information consisting of receivable services parameter values for each service class determined from the number of available slots at the time a radio section, to the mobile station the radio base station using a broadcast channel
The mobile station periodically transmits the broadcast information from the radio base station.
Broadcast information receiving means for periodically receiving and storing the information, and service for each ATM service class and the required service class of the call to be called when the own station calls.
A parameter value and a service class of the radio base station extracted from the broadcast information stored in the broadcast information receiving means.
The radio base station does not support the ATM service class of the call to be called , and compares the radio < br /> Even if the base station supports the ATM service class,
If it is determined that the service parameter value for each requested service class cannot be satisfied, the call processing is stopped, and in other cases, call control means for continuing the call processing is provided. A wireless communication system, characterized by: 4. A mobile station stores, in a broadcast information receiving means, broadcast information broadcast from a wireless base station having the best radio channel condition when broadcast channels of a plurality of radio base stations can be received.
And the calling control means stops calling when the own station calls.
In the case, the broadcast information broadcast from the wireless base station having the next better wireless channel condition is stored in the broadcast information receiving means, and the call control means
To stop / continue call processing again
The wireless communication system according to claim 1, wherein the. 5. The mobile station, wherein the call control means is performing a call processing.
If sealed, any of claims 1 to 3, characterized in that a calling means for retrying the delay time subsequent call processing and call waiting means waiting a predetermined delay time call
A wireless communication system according to any one of claims 1 to 3 . 6. ATM services supported by the own station
Information including class Radio base station that periodically reports
In a mobile station performing ATM transmission via Periodically receives broadcast information broadcast from the wireless base station
Notification information receiving means for storing ATM service of the call to be called when the local station calls
Visclass and broadcast information stored in the broadcast information receiving means
AT supported by the wireless base station extracted from
M service class, and the radio base station
Support the ATM service class of the call to be called
If not, a call control means to stop the call processing is provided.
A mobile station characterized in that: 7. ATM services supported by the own station
Classes and available services in the radio section at that time
Radio base station that periodically broadcasts information including lot numbers
In a mobile station that performs ATM transmission via Periodically receives broadcast information broadcast from the wireless base station
Notification information receiving means for storing ATM service of the call to be called when the local station calls
Visclass, the number of required radio slots and the notification information
The radio extracted from the broadcast information stored in the broadcast receiving means;
ATM service class supported by base station and none
Compare the number of available slots in the line section and
The ATM service of the call to be called by the radio base station.
If you do not support class, or try to make a call
The number of radio slots required for the
If the number of calls exceeds the
A mobile station, comprising: 8. ATM services supported by the own station
Classes and available services in the radio section at that time
Acceptable services for each service class calculated from the number of lots
Broadcasting notification information including service parameter values
In a mobile station performing ATM transmission via a radio base station, Periodically receives broadcast information broadcast from the wireless base station
Notification information receiving means for storing ATM service of the call to be called when the local station calls
Service for each service class and required service class
Parameter values and information stored in the notification information receiving means
A supported by the wireless base station extracted from the report
TM service class Service and service class
Comparing the service parameter value with the
The ATM service class of the call to be called is supported.
If you do not call or request a call to be placed
Service parameter values for each service class
Call control means to stop call processing if not
A mobile station, characterized in that: