WO2007029795A1

WO2007029795A1 - Base station apparatus

Info

Publication number: WO2007029795A1
Application number: PCT/JP2006/317794
Authority: WO
Inventors: Ryota Kawakami
Original assignee: Hitachi Kokusai Electric Inc.
Priority date: 2005-09-05
Filing date: 2006-09-01
Publication date: 2007-03-15
Also published as: JP2007074118A

Abstract

A base station apparatus (1) comprises a means that performs wireless communication with terminal station apparatuses (5a-5c); and a means that uses an IMA channel to communicate with a network side apparatus (2) by use of ATM system. The base station apparatus (1) assigns resources in response to requests from the terminal station apparatuses (5a-5c) and achieves effective data transmissions. There are included a means that stores the usage statues of a plurality of channels between the base station apparatus (1) and the network side apparatus (2); a means that determines whether each of the plurality of channels is in a normal or abnormal state; a means that stores the respective statues of the plurality of channels; and a means that determines, based on the stored contents, the number of resources being in a normal state and being not currently used, and assigns resources or rejects the assignment of resources according to a result of that determination .

Description

Base station equipment

TECHNICAL FIELD The present invention relates to a base station apparatus that allocates resources in response to a request from a terminal station apparatus, and more particularly to a base station that controls resource allocation based on a transmission path state of a line.

Relates to the device. book

BACKGROUND ART For example, in a mobile communication system, wireless communication is performed between a base station device (wireless base station device) and a mobile station device.

FIG. 7 shows a flowchart of a process for adding a new call as an example of an operation performed by the call processing control unit in the base station apparatus. In this example, Asynchronous Transfer Mode (ATM) is used as the wired communication method, and I MA (In V erse Mu 1 tip 1 exing for ATM) is used as the physical interface of the transmission path. Time / line is used. Then, the base station apparatus allocates resources such as a transmission path band and a radio channel according to a request from the mobile station apparatus. Specifically, when a call processing is performed from the mobile station device side, the base station device that has received the call calculates the number of resources currently in use (step S). 31) After that, the number of resources that must be secured in the service requested by the mobile station device is calculated (step S32). Then, based on these values, the base station apparatus checks (checks) the number of free resources and determines whether or not the resource requested by the mobile station apparatus can be allocated (STEP). Up S 33).

If the result of this determination (step S33) is that there is sufficient free space for all resources and the newly requested resource can be allocated, call acceptance processing such as securing the requested resource is performed. (Step S34), the connection control of the new call is actually performed (Step S35).

On the other hand, if the result of the above determination (step S33) indicates that there is a shortage of resources and it is impossible to allocate the newly requested resource, the request is sent to the requesting mobile station device. Call acceptance refusal processing such as notifying that a call cannot be added is performed (step S36).

Patent Literature 1

JP 2002-223239 DISCLOSURE OF THE INVENTION

However, the call addition process as shown in Fig. 7 has the following problems.

In other words, in the IMA line used for the transmission line physical interface, when a plurality of transmission lines are set as one group and operated, if a transmission line abnormality occurs in some lines, but not all of those lines, Data transmission can be performed on lines other than those on which an error has occurred. For this reason, if some abnormality occurs in the transmission line interface, the number of resources that cannot actually be used at present can be misrecognized and calculated as being currently available. There is sex. In this case, even if the call connection process is completed and data is actually sent, the data may be discarded in the middle of the communication due to the transmission bandwidth being over, so that efficient data transmission cannot be performed. There was a problem.

The present invention has been made in order to solve such a conventional problem. To provide a base station apparatus capable of ensuring efficient data transmission by controlling resource allocation based on a line transmission path state when allocating resources in response to a request from the apparatus. Objective.

In order to achieve the above object, the base station apparatus according to the present invention allocates communication resources to the terminal station apparatus in response to a request from the terminal station apparatus with the following configuration.

That is, the wireless communication means communicates a signal wirelessly with the terminal station device. The network-side communication means communicates signals with the network-side device using the IMA line using the ATM method.

Usage status storage means stores usage statuses of a plurality of lines used for communication with the network side device. The detecting means detects whether each of the plurality of lines is in a normal state or an abnormal state. The status storage means stores the status of each of the plurality of lines based on the detection result by the detection means. In response to a request from the terminal station apparatus, the allocation control unit calculates the number of resources that are in a normal state and are free based on the storage contents of the usage status storage unit and the storage contents of the state storage unit. And, based on the detection result, allocates a resource to the terminal station apparatus or rejects the resource allocation.

Therefore, since whether to allocate resources to the terminal station apparatus or to reject resource allocation is controlled based on the usage status of multiple lines and whether it is normal or abnormal, for example, When resources are allocated in response to a request from a terminal station device, resource allocation can be controlled based on the transmission path state of the line, and efficient data transmission can be ensured.

Here, various types of base station devices may be used.

Various terminal station devices may be used. For example, a mobile station device or a fixed station device may be used. Various devices may be used as the network side device, for example, a wireless network control device may be used.

In addition, each of the usage status storage means and the status storage means can be configured using, for example, a memory. In addition, the usage status storage means and the status storage means can be configured by a common memory.

Further, various numbers may be used as the number of the plurality of lines.

In addition, as the usage status of a plurality of lines, for example, each line may be assigned to any terminal station device or other device, or may be assigned to any device. It is stored whether or not it is free and unused.

Also, as the state of each of the plurality of lines, for example, the power that is normal state or the state that is abnormal is stored.

Further, when detecting or storing whether each line is in a normal state or an abnormal state, for example, a state in which the type of abnormality is also detected and stored can be used.

Further, as a request from the terminal station device, for example, a call signal requesting allocation of resources is used, and information such as a service type may be included. For example, it is possible to use a mode in which the number of resources that need to be allocated is determined according to the type of service.

Further, as the resource, for example, a transmission path band or a radio channel is used. As specific examples, resources used in radio communication between the base station device and the terminal station device, or inside the base station device are used. That are used for this processing, and those that are used for communication between the base station device and the network side device.

As the number of resources, for example, the number of call channels that can be used simultaneously and the number of users (terminal station devices, etc.) that can be connected simultaneously are used. be able to. When such channels and users correspond one-to-one or at other ratios, the number of simultaneously available call channels and the number of users that can be connected simultaneously correspond to that ratio.

In addition, various modes may be used as resource allocation control modes. For example, the number of resources that are in a normal state and free (that is, not used) is the terminal station apparatus. If the number of resources requested from the terminal station is greater than the number of resources requested, the resources are allocated. On the other hand, if the number of resources that are normal and free is less than the number of resources requested from the terminal station, You can use a mode of rejecting assignments. Brief Description of Drawings

FIG. 1 is a diagram showing a configuration example of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a base station apparatus according to an embodiment of the present invention. FIG. 3 is a diagram showing an example of a transmission path state management table according to an embodiment of the present invention.

FIG. 4 is a diagram showing an example of a procedure of a transmission path alarm monitoring process according to an embodiment of the present invention.

FIG. 5 is a diagram showing an example of a procedure of a line state change process according to an embodiment of the present invention.

6 is a diagram showing an example of a procedure of a call addition process according to an embodiment of the present invention ₍ FIG. 7 is a diagram showing an example of a procedure of a call addition process. Best form

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration example of a mobile communication system according to an embodiment of the present invention. The mobile communication system of this example includes a base station device (radio base station device) 1, a radio network control device 2 that is a network side device, an exchange 3, a network 4, and a plurality of mobile stations that are terminal station devices. Devices 5a, 5b, 5c are provided. It should be noted that various numbers may be used for each device.

In the mobile communication system of this example, a signal transmitted by radio from the mobile station devices 5a, 5b, and 5c is received by the base station device 1, and the signal is transmitted to the radio network controller 2 and the exchange. The data is transmitted to the network 4 via the device 3 and transmitted to the transmission destination device. In addition, a signal transmitted from the transmission source device to the network 4 is transmitted to the base station device 1 via the exchange 3 and the radio network control device 2, and the signal is transmitted from the base station device 1 to the mobile station device. 5a, 5b, 5c are transmitted wirelessly.

In this example, an asynchronous transfer mode (ATM) is used for communication between the base station apparatus 1 and the radio network controller 2, and an IMA line is used as a transmission path physical interface. An IMA line bundles multiple lines and uses them as one group interface. For example, a signal transmitted from one mobile station device to the base station device 1 is sent to multiple lines that constitute the group interface. It can be distributed and transmitted to the radio network controller 2.

In response to a request from the mobile station devices 5a, 5b, 5c, the base station device 1 makes a request for the mobile station devices 5a, 5b, 5c of the request source, such as the transmission path band and the radio channel. Allocate resources.

FIG. 2 shows a configuration example of the base station apparatus 1.

The base station apparatus 1 of this example includes a transmission path interface unit 1 1, a call processing control unit 1 2, a maintenance monitoring control unit 1 3, a transmission line signal switching function unit 1 4, a wireless transmission / reception unit 1 5, A wireless amplifying unit 16, a storage unit 17, and an external interface control unit 18 are provided.

The transmission line interface unit 1 1 controls connection with the radio network controller 2. The call processing control unit 12 performs call control.

The maintenance monitoring control unit 1 3 performs maintenance monitoring control.

The transmission line signal switching function unit 14 separates and multiplexes the signals in the device.

The radio transmission / reception unit 15 performs connection control between the mobile station apparatuses 5a, 5b, and 5c via the radio interface.

The wireless amplifying unit 16 is connected to the antenna and amplifies a signal communicated with the mobile station devices 5a, 5b, 5c.

The storage unit 17 is composed of a memory, for example, and holds data.

The external interface control unit 18 performs connection control with a maintenance terminal device such as a personal computer (PC).

The transmission line interface unit 11 has an inverse multiplexing function (IMA function) for ATM.

The maintenance monitoring control unit 13 has a function of monitoring the state of each transmission line having a plurality of lines, and detects, for example, whether it is in a normal state or various specified abnormal states.

The call processing control unit 12 has a call admission control function that permits or restricts acceptance of a new call according to the transmission line status detected by the maintenance monitoring control unit 13.

Here, the maintenance monitoring control unit 13 in this example manages the state of the transmission line (IMA line) using a table.

In the base station apparatus 1, as an operation for performing the maintenance monitoring control, for example, the setting of the operation mode of the IMA line and the operation start control are executed during the start-up process of the base station apparatus 1, and the third A method of expanding the table as shown in the figure and performing the monitoring process, or a storage unit (in this case, a non-volatile memory) as shown in FIG. 2 during the startup process of the base station apparatus 1 7 The operation mode of the I MA line stored in advance The set values can be developed into a table as shown in Fig. 3, and the operation start control can be used, and any operation of the monitoring process can be used.

FIG. 3 shows an example of such a table (transmission path state management table).

In the transmission line state management table of this example, the value of the number of used lines and information on each of the N number of lines are stored.

The information about each line 1 to N is the same. Taking line 1 as an example, the value of the physical line number, the value of the virtual path identifier (VP I: Virtual Part I dentifier), and the virtual channel identifier (VC I : V irtual Ch ann el I dentifier), multiple M line states (line state [0] to line state [M-1]), and virtual path (VP) bandwidth value The virtual channel (VC) bandwidth value and the virtual path (VP) bandwidth value that can be used now are stored.

In general, a virtual path is a path between endpoints, a virtual channel is a connection established in call setting processing, and a plurality of virtual channels are set in the virtual path.

In addition, the transmission line status of the IMA line includes a normal state and an abnormal state. For abnormal conditions, for example, AIS, RAI, LOS, LOF, CRC, LCD, VP—AI S, and VP—RDI are detected as types of transmission line alarms when an abnormality is detected. TU—T G.431 / I TU—T G. Performs operations specified in 432.1.

Here, AIS (A larm Indication Signal) is a warning indication signal, RA I (Remote Defect Indication) is a remote failure indication, and LOS (Loss Of Signal) is a signal. Loss, LOF (Loss Of Frame) represents frame synchronization loss, CRC (C yclic R edundancy C heck) represents quality degradation, L CD (Loss Of Cell Delineation) represents loss of cell synchronization, and VP — AIS (Virtual Path — A la rm Indication S igna 1) is Indicates VP failure (failure that occurred in VP connection) downstream (cell), and VP—RD I (Virtual Path — Remote Defect Indication) indicates VP failure (occurred in VP connection) Indicates a signal (cell) that notifies upstream of (failure).

In addition, in this example, when a plurality of transmission lines (lines) are operated as one group, if an abnormality occurs in one of the plurality of transmission lines, the entire group Therefore, it is determined that only the transmission line in which the abnormality has occurred is unusable, and only the number of resources that can be transmitted through the transmission line in which the abnormality has occurred is treated as unusable.

Also, as in this example, when resources are allocated by referring to the transmission path state management table, for example, allocation is performed in two stages: the number of remaining resources of the baseband processing unit and the number of remaining resources of the line. Is determined, and resources are allocated when both of these can be allocated.

As the number of resources, for example, the number of simultaneous call channels and the number of simultaneously connectable users are used for resources such as transmission band and radio channel. In base station device 1, the number of remaining free resources is the number of resources that are not used due to the occurrence of an abnormality after subtracting the number of resources in use from the total number of resources. . Also, the number of new call resources requested from the mobile station devices 5a, 5b, 5c is calculated according to, for example, the type of communication service requested. In general, the number of required resources differs for each service type.

An example of the operation performed by the base station apparatus 1 of this example is shown.

In FIG. 4, the transmission path interface unit 1 1 of the base station apparatus 1 of this example The flowchart of the process which monitors an alarm is shown.

In this example, the line status of the transmission path interface unit 11 is always monitored (for example, in a predetermined cycle) so as to detect whether the transmission path is normal or abnormal. The transmission line status (line status) is monitored for each line, for example.

When it is detected that the transmission path is normal or a transmission path alarm indicating that the transmission path is abnormal is detected, first, the transmission path alarm is detected or the type of the detected transmission path alarm is read. (Step S l). Next, the current line status changes compared to the line status at the time of the previous inspection based on the normality of the transmission path or the detection result of the content of the detected transmission path alarm type. (Step S 2).

As a result of this determination, if the current line status has not changed from the previous line status! /, If this is the case, the current transmission line alarm monitoring process is terminated.

On the other hand, if the current line state has changed from the previous line state, the presence or absence of a transmission line alarm (presence of transmission line abnormality) is inspected (step S 3).

If there is a transmission line alarm as a result of this inspection, for example, a predetermined alarm detection process such as turning on an LED (Light Emitting Diode) to indicate that a transmission line abnormality has occurred is performed. S 4) In addition, when there is no transmission line alarm, a normal state has been detected.For example, when a predetermined alarm is released such as turning off the lit LED to indicate that the transmission line has been recovered from an abnormality. (Step S6) A signal for notifying that the line status has changed is then sent to the maintenance monitoring control unit 1 3 (Step S6). It includes the occurrence of an abnormality and the content of the transmission line alarm.

In this example, the case where the process of step S2 described above is performed has been shown, but as another example, the process of step S2 described above can be omitted and not performed. In this case, in the processing of step S6 described above, for example, a signal for notifying is sent only when the line state changes.

FIG. 5 shows a flowchart of processing performed when the line state is changed by the maintenance monitoring control unit 13 of the base station apparatus 1 of the present example.

When the maintenance monitoring control unit 1 3 receives a notification that the line status has changed from the transmission line interface unit 1 1, the maintenance monitoring control unit 1 3 responds to each line in the transmission line state management table with the content (transmission line alarm status). (Step S1 1). Then, processing such as notifying other devices such as the host device that the line state has changed is performed as necessary (step S 1 2).

Here, in this example, when there is a change from the previously reported line status, it is notified to the higher-level device, etc. When all other types of abnormalities occur during the abnormal state, all the higher-level devices etc. Although it is configured to notify, as another configuration example, it is possible to use a configuration that does not particularly notify because an abnormal state does not change even if another type of abnormality occurs during an abnormal state. Such notification conditions depend on the agreement with the host device.

FIG. 6 shows a flowchart of processing for adding a new call as an example of the operation performed by the call processing control unit 12 of the base station apparatus 1 of this example.

In the situation where the processing as shown in Fig. 4 and Fig. 5 is constantly performed, if the outgoing (calling) processing is performed from the mobile station 5a, 5b, 5c side, The base station apparatus 1 that has received the check first checks the state of each line based on the transmission line state management table managed by the maintenance monitoring control unit 13 and checks whether there is a transmission line alarm (stepping). S 2 1).

As a result of this inspection, if there is a transmission line alarm (transmission line abnormality) on one or more lines in the line group of the IMA line to be used, the resource that cannot be used due to a transmission line abnormality at present. The number is calculated (step S 2 2). On the other hand, use If there is no transmission line alarm (transmission line abnormality) and all lines are normal in the IMA line group, the number of unusable resources is zero (none).

Next, the number of resources currently in use is calculated (step S 2 3), and then the number of resources that must be secured in the services requested from the mobile station devices 5 a, 5 b, and 5 c. Is calculated (step S 2 4). Then, when there are resources that cannot be used due to these values and transmission path abnormalities, the base station apparatus 1 checks (checks) the number of free resources based on the number of values. It is determined whether or not the resource requested from the mobile station devices 5a, 5b, and 5c can be allocated (step S25).

As a result of this determination (step S 2 5), if there is sufficient free space for all resources and the newly requested resource can be allocated, call acceptance processing such as securing the requested resource is performed. (Step S 2 6) and actually perform connection control for a new call (Step S 2 7).

On the other hand, if the result of the above determination (step S 2 5) indicates that the resource is insufficient and the newly requested resource cannot be allocated, the requesting mobile station devices 5 a, 5 b, 5c performs call admission rejection processing such as notifying that the requested call cannot be added (step S28).

The number of free resources that can be used at present is the total number of resources plus the number of resources in use and the number of resources that cannot be used due to a transmission line error. This is the result of subtracting.

In addition, if an abnormality occurs on the line after the line has been assigned to the call, in this example, an ATM line is used, so an IMA line that can operate normally at present. Data discard does not occur if the bandwidth is within this range, but data discard occurs if the bandwidth that is inherently operable is exceeded.

As described above, in the base station apparatus 1 of the mobile communication system of this example, the IMA line is connected. Monitor and detect transmission line anomalies that occur in each line of the transmission line interface unit 1 1 and allow or restrict (reject) the acceptance of new calls according to the state of each line that changes dynamically. Perform call admission control.

Therefore, since the base station device 1 takes the initiative to realize a certain level of flow control for transmission data, it is possible to perform data transmission with the highest performance according to the transmission path status of each line. Become. As a result, for example, it is possible to reduce retransmission processing and prevent traffic from becoming a heavy load. In addition, even during degeneration operations by IMA devices in the event of a transmission line failure, it is possible to prevent unnecessary cell discards during communication due to factors such as an over-transmission band, and by preventing unnecessary cell discards, It is always possible to ensure the most efficient data transmission (data transfer) under certain circumstances.

As described above, in the base station apparatus 1 of this example, an abnormality occurs in the line by managing the number of resources in consideration of, for example, the transmission path state of the line that was not reflected in the management of the number of resources in the past. Even in such a case, it is possible to accurately calculate the number of resources that can be used by the base station device 1 at present, and thereby to always obtain the optimum transmission efficiency in each situation that varies with time. It can be realized.

In the base station apparatus 1 of this example, wireless communication is performed by the function of wirelessly communicating with the mobile station apparatuses 5a, 5b, and 5c by the wireless transmission / reception unit 15 and the wireless amplification unit 16 and the antenna. The network side communication means is configured by the function to communicate with the wireless network control device 2 by the ATM system using the IMA line by the transmission path interface unit 1 1 and maintenance monitoring. The control unit 13 is configured by a function for storing the usage status of each line using the transmission path status management table shown in Fig. 3, and the usage status storage means is configured by the transmission path interface unit 11 and the like. The detection means is configured by the function to detect the normal / abnormal state of each line, and the maintenance monitoring control unit 13 is shown in Fig. 3. The state storage means is configured by the function of storing the normal / abnormal state of each line using the transmission line state management table, and the call control processing unit is based on the usage status and normal / abnormal state of each line. The assignment control means is configured by the function in which 1 2 controls the assignment of resources to the mobile station apparatuses 5a, 5b, and 5c.

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the above-described configuration, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, a recording medium for recording the program, or the like. Also, it can be provided as various devices and systems.

Further, the application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.

In addition, various processes performed in the system and apparatus according to the present invention include, for example, a control program stored in a ROM (R ead Only Memory) in a hardware resource including a processor and a memory. A configuration controlled by execution may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.

In addition, the present invention can be understood as a computer-readable recording medium such as a floppy (registered trademark) disk CD (Compact Disc) _ROM that stores the above control program or the program (itself). In addition, the control program can be executed by inputting the control program from the recording medium to a computer and causing the processor to execute the control program.

Industrial applicability

As described above, according to the base station apparatus of the present invention, the usage status (power used, whether it is used) of multiple lines and the status of each of the multiple lines. Status (normal or abnormal) is memorized, and on the basis of the stored contents, in response to a request from the terminal station apparatus, resources are allocated to the terminal station apparatus or resource allocation is rejected. For example, when allocating resources in response to a request from a terminal station device, resource allocation can be controlled based on the transmission path status of the line, and efficient data transmission can be achieved. Can be secured.

Claims

The scope of the claims

1. Wireless communication means for wirelessly communicating signals with a terminal station device and network side communication means for communicating signals with an ATM system using an ATM system between network side devices, In a base station apparatus that allocates communication resources to the terminal station apparatus in response to a request from the station apparatus,

Usage status storage means for storing usage statuses of a plurality of lines used for communication with the network side device;

Detecting means for detecting whether each of the plurality of lines is in a normal state or an abnormal state;

State storage means for storing respective states of the plurality of lines based on a detection result by the detection means;

In response to a request from the terminal station apparatus, the number of resources that are in a normal state and are vacant is detected based on the storage contents of the usage status storage means and the storage contents of the state storage means, and the detection result An allocation control means for allocating resources to the terminal station apparatus or rejecting the allocation of resources based on

A base station apparatus comprising: