JP2002218530A - Module management unit for wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a module management unit for a wireless communication system and a module management method that can efficiently consume power. SOLUTION: A module configuration of three blocks is adopted for a network interface section 201 and a transmission/reception section 203. The operation of only the module 1 of this invention attains traffic of a small capacity, the operations of the modules 1, 2 attains traffic of a medium capacity and the operations of all the modules 1-3 attains traffic of a large capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more specifically, to a PHS WLL (Wireless Lo
cal Loop) system.

[0002]

2. Description of the Related Art Conventional PHS WLL system (hereinafter, WLL)
In the base station, the number of modules in each section was determined and maintained according to the desired traffic specifications, and in the system control section that controls the entire system of the base station, all installed modules were constantly energized and operated. . For example, if the traffic volume is the largest on the night before the holiday, the traffic specification of the base station is determined in consideration of the maximum traffic at this time, and the modules of each unit are mounted on the base station.

[0003]

However, the actual traffic volume fluctuates greatly depending on time zones such as daytime and nighttime, weekdays and holidays. Therefore, even in a time zone such as late at night when there is almost no traffic, all the modules exhibiting the maximum traffic are operating in the base station. This consumes more power than necessary, and causes a shortened failure life due to excessive operation time.

[0004]

In order to solve the above-mentioned problems, a module management device for a wireless communication system according to the first invention of the present application includes means for measuring traffic in each time zone, and using the measured traffic as a traffic record. It is characterized by comprising means for storing, means for deriving predicted traffic in the time zone based on actual traffic, and means for controlling the number of activation modules based on the predicted traffic.

A module management apparatus for a wireless communication system according to a second aspect of the present invention includes means for setting and storing a traffic upper limit value and a traffic lower limit value for each number of activated modules, and a method for controlling traffic when the traffic exceeds the traffic upper limit value. Is characterized by comprising means for increasing the number of activation modules by a predetermined number, and means for decreasing the number of activation modules by a predetermined number when the traffic falls below the traffic lower limit.

Further, the module management apparatus for a wireless communication system according to the first aspect of the present invention includes means for setting and storing a traffic upper limit value and a traffic lower limit value for each number of activated modules; Preferably, the system preferably includes means for increasing the number of activation modules by a predetermined number, and means for decreasing the number of activation modules by a predetermined number when the traffic falls below the lower traffic limit.

Further, the module management apparatus for a wireless communication system according to the first and second aspects of the present invention includes means for monitoring and storing a wireless state of each wireless channel, and an unused wireless channel when increasing the number of wireless channels used. Among the means for adopting an increasing number of wireless channels in order from the best wireless condition, and when reducing the number of wireless channels used,
It is preferable to include means for reducing the number of wireless channels in the decreasing order from the worst wireless channel in use from the worst wireless condition.

In order to solve the above problems, a module management method for a wireless communication system according to a third aspect of the present invention includes a step of measuring traffic in each time zone, and a step of storing the measured traffic as a traffic record. , A step of deriving predicted traffic in the time zone based on the actual traffic, and a step of controlling the number of activation modules based on the predicted traffic.

The module management method for a wireless communication system according to the fourth aspect of the present invention includes a step of setting and storing a traffic upper limit value and a traffic lower limit value for each number of activated modules, and a step of setting and storing the traffic when the traffic exceeds the traffic upper limit value. Is characterized by comprising a step of increasing the number of activation modules by a predetermined number, and a step of decreasing the number of activation modules by a predetermined number when the traffic falls below the traffic lower limit.

Further, the module management method for a wireless communication system according to the third aspect of the present invention includes the steps of: setting and storing a traffic upper limit value and a traffic lower limit value for each number of activated modules; and, when the traffic exceeds the traffic upper limit value. Preferably includes a step of increasing the number of activation modules by a predetermined number, and a step of decreasing the number of activation modules by a predetermined number when the traffic falls below the lower traffic limit.

In the module management method for a wireless communication system according to the third and fourth aspects of the present invention, the step of monitoring and storing the wireless state of each wireless channel and the method of managing the number of unused wireless channels when the number of used wireless channels is increased. The step of adopting an increasing number of radio channels in order from the best radio condition and the case of decreasing the number of radio channels used, the decreasing number of radio channels in use in order from the worst radio condition in the worst radio condition. And preferably reducing wireless channels. Further, the fifth invention of the present application is a base station including the above-described module management device, wherein each base module is activated / stopped according to the number of activated modules, and executes a predetermined process.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a module management apparatus for a wireless communication system according to the present invention. FIG. 1 is an explanatory diagram of the whole WLL system according to the present invention, FIG. 2 is a functional block diagram of a base station for explaining the present embodiment, FIG. 3 is a graph showing an example of traffic fluctuation, and FIGS. 3 is a flowchart illustrating an embodiment of the present invention.

FIG. 1 is an explanatory diagram of the whole WLL system. The base station 103 is connected to a public communication network 105 to which general subscriber telephones are connected, and a plurality of subscriber stations 101 are installed at various locations and are scattered. Further, since the base station 103 and the subscriber station 101 are connected by a wireless line, the public communication network 1
In this system, a general subscriber telephone connected to the subscriber station 05, the subscriber station 101, and a call between the subscriber stations 101 can be made.

FIG. 2 is a block diagram showing the configuration of the base station according to the present invention. It comprises a transmission / reception unit 203 for performing wireless communication with the subscriber station 101, a network interface unit 201 for enabling connection between the transmission / reception unit 203 and the public communication network 105, and a system control unit 211 for controlling these. In the network interface unit 201 and the transmission / reception unit 203, each module is operable for each module in proportion to the traffic. In the present embodiment, both the network interface unit 201 and the transmission / reception unit 203 have a module configuration of three blocks (module 1 to module 3). According to the present invention, small-capacity traffic can be achieved by the operation of the module 1 alone, medium-capacity traffic can be achieved by the operation of the modules 1 and 2, and large-capacity traffic can be achieved by the operation of all the modules 1 to 3.

The system control unit 211 is provided with a storage unit 209 for storing traffic measured in the past (referred to as “traffic record” in the present embodiment). The prediction calculation unit 207 analyzes the actual traffic data stored in the storage unit 209 and calculates the optimum prediction traffic within a certain time. Further, it comprises a module control unit 205 for controlling the transmission / reception unit 203 and the network interface unit 201 based on the predicted traffic as the calculation result.

FIG. 3 is a diagram showing an example of traffic fluctuation. The figure shows traffic for one day from 6:00 am. As can be seen from the figure, the traffic is small from midnight to 7:00 in the morning, the traffic increases from 7:00 to 7:00 in the evening, and the highest traffic is from 17:00 to midnight before 24:00.

1. (1) First Embodiment In this embodiment, the traffic in the above three time zones is divided into patterns, and the modules of the base station are controlled so as to match the actual traffic. Specific examples of the traffic pattern and the boot module corresponding to the traffic pattern are shown below. Traffic pattern 1 (midnight at 24:00 to 7:00 in the morning) Only small-volume traffic of "module 1 only" is operated. Traffic pattern 2 (7:00 am to 17:00 pm) Operates medium-volume traffic of "module 1 + module 2". Traffic pattern 3 (from 17:00 in the evening to 24:00 in the evening) A large-capacity traffic of “module 1 + module 2 + module 3 (all modules operate)” is operated.

(2) Second Embodiment In this embodiment, a case will be described in which control and management of each module of a base station is performed according to actual traffic fluctuation.
Similarly, a specific example of a traffic pattern having a traffic width and an activation module corresponding to the traffic pattern will be described with reference to FIG. Note that X and Y are numerical values indicating the amount of traffic, and are set to “0 <X <Y”. Traffic pattern 1 (0 ≦ actual traffic ≦ X) Only small-capacity traffic of “module 1 only” is operated. Traffic pattern 2 (X <actual traffic ≦ Y) Medium-volume traffic of “module 1 + module 2” is operated. Traffic pattern 3 (Y <actual traffic) A large-capacity traffic of “module 1 + module 2 + module 3 (all module operation)” is operated. For example, in FIG. 3, at 6:00 in the morning when the actual traffic is below X, only the module 1 starts and operates, and when the actual traffic exceeds the upper limit X at 7:00 in the morning, the module 2 is added to the module 1 and the module 2 To increase the traffic capacity of the base station from a small capacity to a medium capacity.

(3) Third Embodiment While the module control as described in the above (1) First Embodiment is being performed, traffic increases due to a disaster or the like, and actual traffic becomes traffic. It may exceed the maximum value of the achievement. In this embodiment, in order to cope with such a situation, actual traffic is monitored while performing module control based on predicted traffic.
When the actual traffic exceeds a predetermined upper limit, the number of activation modules is increased, and when the actual traffic falls below a predetermined lower limit, the number of activation modules is decreased.

2. Wireless Channel Addition / Reduction Method (1) Fourth Embodiment When increasing or decreasing the number of modules, the required increase or decrease in the number of wireless channels is also managed based on past results (such as little radio interference). Do. The processing at this time will be described with reference to FIGS. To increase traffic, a new radio channel is required. At this time, a radio channel with a relatively good radio condition is newly added from all available radio channels. For example, when three wireless channels are to be added, three channels are adopted in order from the available and unused wireless channels in the order of the best wireless condition. Conversely, when traffic is reduced, a radio channel having a relatively poor radio condition is reduced from the radio channels used. For example, if the wireless channel is 3
To reduce the number of channels, three channels are reduced in order from the worst radio channel in use in the worst radio condition.

The above details will be described with reference to FIG. The base station operating with the required traffic (S401) transmits test radio waves to all wireless channels and checks the wireless state (S40).
3). Judgment Whether to Increase Traffic (S40)
As a result of 5), if the number is to be increased, the process proceeds to S419; otherwise, the process proceeds to S407. In S407, it is determined whether to reduce the traffic. If the traffic does not decrease, that is, if the same traffic is maintained, the process returns to S401. On the other hand, if the number is to be reduced, the system controller 211 calculates the “number of module reductions” and the “number of wireless channel reductions” from the required traffic (S409). Next, similarly, the system control unit 211 extracts the decreasing radio channels in order from the one with the worse radio condition according to the number of decreasing wireless channels (S411). Then, it is checked whether or not the remaining activation module has a reduced wireless channel (S413). If there is no reduced wireless channel, the module to be stopped (stop module) is stopped by the system control unit 211 (S415). If the remaining active module has a wireless channel to be reduced (reduced wireless channel), the line is moved to the module for which the reduced wireless channel of the module is to be stopped, and at that time, the lines for the number of mobile lines are stopped. From the module to be activated to the remaining activation module (S414). Subsequently, the module to be stopped is stopped by the system control unit 211 (S415). The required traffic is obtained by stopping the module in the above procedure (S41).
7).

3. How to Stop a Module When traffic is reduced, the module is stopped. In this case, the module is stopped in two ways. One is when there is a call line remaining in the module to be stopped, after all calls are completed,
Method for stopping module (fifth embodiment). The other is a method (sixth embodiment) in which, when a communication line remains in the module to be stopped, all the communication lines are transferred to the remaining activation module, and the module to be stopped is stopped (sixth embodiment).

(1) Fifth Embodiment A fifth embodiment will be described with reference to FIG. During operation with necessary traffic (S501), the system management unit manages the communication line and the module concerned (S503).
As a result of the determination as to whether or not to reduce the traffic (S505), the process proceeds to S507 if the traffic is to be reduced, or to S50 if the traffic is not reduced, that is, if the same traffic is maintained.
Return to 1. In S507, the “number of operation modules to be reduced” is calculated from the required traffic.

Next, the communication use line of the module to be stopped is monitored (S509). It is confirmed whether or not a new communication line is necessary (S511), and if necessary, control is performed so that the line of the remaining activation module is used for the new communication line (S515). After the processing of S515 or S511
If it is determined that a new communication line is unnecessary in step S51, after the communication of all the lines of the module to be stopped is completed (S51).
3) The module is stopped (S517) and the traffic becomes necessary (S518).

(2) Sixth Embodiment This embodiment will be described with reference to FIG. During operation with the required traffic (S601), the system management unit manages the communication line and the module (S603).
As a result of the determination as to whether or not to reduce the traffic (S605), the process proceeds to S607 if the traffic is to be reduced, and to S60 if the traffic is not reduced, that is, if the same traffic is maintained.
Return to 1. In S607, "the number of operation modules to be reduced" is calculated from the required traffic.

Next, the communication line of the module to be stopped is switched to the line of the remaining activation module (S6).
09). Check whether a new telephone line is necessary (S61).
1) If necessary, control is performed so that the line of the remaining activation module is used for the new communication line (S613). S
After the process of 613, or when it is determined in S611 that a new communication line is unnecessary, all the lines of the module to be stopped are terminated (S614). Thereafter, the module is stopped (S615) and the traffic becomes necessary (S615).
616).

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above description. For example, three traffic patterns are applied in the first to third embodiments. It is obvious that the present invention is not limited to the above numerical values. In the above embodiment, the case where the present invention is applied to the WLL system has been described. However, it is apparent that the present invention can be applied to a "wireless subscriber data communication service system" other than the WLL system.

[0028]

As described above, according to the present invention, it is possible to provide a module management device and a module management method for a wireless communication system that can efficiently consume power. Further, according to the present invention, it is possible to provide a module management apparatus and a module management method for a wireless communication system that can avoid shortening of a failure life by reducing excessive module operation time.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram of a WLL system.

FIG. 2 is a functional block diagram of a base station explaining the embodiment of the present invention.

FIG. 3 is a graph showing an example of traffic fluctuation.

FIG. 4 is a flowchart illustrating an embodiment of the present invention.

FIG. 5 is a flowchart illustrating an embodiment of the present invention.

FIG. 6 is a flowchart illustrating an embodiment of the present invention.

[Explanation of symbols]

 205 module control unit 207 prediction operation unit 209 storage unit 211 system control unit

Claims (9)

[Claims] 1. A module management device for a wireless communication system for varying the number of activation modules in a base station according to traffic, means for measuring traffic in each time zone, and means for storing the measured traffic as actual traffic. A module management device for a wireless communication system, comprising: means for deriving predicted traffic in the time zone based on the traffic results; and means for controlling the number of activation modules based on the predicted traffic. 2. A module management apparatus for a wireless communication system for varying the number of activation modules in a base station according to traffic, wherein the means for setting and storing a traffic upper limit value and a traffic lower limit value for each activation module number; Means for increasing the number of activation modules by a predetermined number when the traffic exceeds the upper limit of traffic; and means for decreasing the number of activation modules by a predetermined number when the traffic falls below the lower limit of the traffic. Module management device for a wireless communication system. 3. The module management device for a wireless communication system according to claim 1, wherein a means for setting and storing a traffic upper limit value and a traffic lower limit value for each number of activated modules, and when the traffic exceeds the traffic upper limit value. Means for increasing the number of activation modules by a predetermined number, and means for decreasing the number of activation modules by a predetermined number when the traffic falls below the traffic lower limit value. . 4. The module management device for a wireless communication system according to claim 1, wherein said module for monitoring and storing a wireless state of each wireless channel is provided. Means for adopting an increasing number of radio channels in order from the best radio condition among the radio channels in use; and, when decreasing the number of radio channels used, the worst radio condition among the radio channels in use. Means for reducing the number of wireless channels by a decreasing number in order from the first module. 5. A module management method for a wireless communication system in which the number of active modules in a base station is varied according to traffic, wherein a step of measuring traffic in each time zone, and a step of storing the measured traffic as a traffic record. A module management method for a wireless communication system, comprising: deriving predicted traffic in the time zone based on the actual traffic; and controlling the number of activation modules based on the predicted traffic. 6. A module management method for a wireless communication system in which the number of active modules in a base station is changed according to traffic, wherein a step of setting and storing a traffic upper limit value and a traffic lower limit value for each active module number is performed. A step of increasing the number of activation modules by a predetermined number when the traffic exceeds the upper limit of traffic; and a step of decreasing the number of activation modules by a predetermined number when the traffic falls below the lower limit of the traffic. Module management method for a wireless communication system. 7. The module management method for a wireless communication system according to claim 5, wherein a traffic upper limit value and a traffic lower limit value are set and stored for each activated module, and wherein the traffic exceeds the traffic upper limit value. A step of increasing the number of activation modules by a predetermined number, and a step of decreasing the number of activation modules by a predetermined number when the traffic falls below the lower limit of traffic. . 8. The module management method for a wireless communication system according to claim 5, wherein the step of monitoring and storing the wireless state of each wireless channel and the step of increasing the number of used wireless channels are performed. Selecting an increasing number of radio channels in order from the best radio condition of the radio channels in use; and decreasing the number of radio channels used, the worst radio condition of the radio channels in use. Reducing the number of wireless channels in order of decreasing number of wireless channels. 9. A base station comprising the module management device for a wireless communication system according to claim 1, wherein each base module is started / stopped according to the number of boot modules, and a predetermined process is performed. A base station characterized by performing.