JP2008010920A - Base station apparatus and scheduling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base station apparatus capable of carrying out optimum scheduling in matching with a traffic state of a base station. <P>SOLUTION: The base station apparatus making communication with a plurality of communication terminals while switching a communication right in response to a request from the communication terminals includes: a switching means for switching the communication right, a calculation means for calculating a traffic amount, and an adjustment means for adjusting an interval of switching the communication right on the basis of the traffic amount, and the adjustment means decreasingly adjusts the interval of switching the communication right when the traffic amount is greater than a prescribed value and increasingly adjusts the interval of switching the communication right when the traffic amount is smaller than the prescribed value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a base station apparatus and a scheduling method that dynamically switch communication right assignment for a connection call.

Conventionally, in a base station apparatus that establishes a wireless communication line with a mobile terminal and performs information communication, when a connection call from a plurality of mobile terminals exceeds the number of connectable slots, a time division multiplexing method is used. It is known to switch communication rights given to each mobile terminal. In this time division multiplexing system, the apparent number of slots can be increased by switching the communication rights given to each mobile terminal in the base station apparatus based on connection calls from a plurality of mobile terminals. It becomes possible to increase the number of mobile terminals that can communicate simultaneously with the station apparatus.
As a prior art, there is known a scheduled transmission schedule changing method in which a transmission schedule is changed based on received information in order to improve data transmission scheduling and optimize system throughput. (For example, refer to Patent Document 1).
Japanese translation of PCT publication No. 2004-536496

  However, in the conventional scheduling operation, when there is a situation where switching (scheduling) of communication right allocation occurs in the base station apparatus, communication right assignment is always performed at a fixed switching interval for each connection call regardless of the traffic volume. Had gone. For this reason, when the traffic volume is large, the waiting time for communication right allocation increases, leading to a decrease in user response, and when the traffic volume is small, excessive switching of communication right allocation occurs, and the base station apparatus There is a problem that the total throughput of the system is lowered.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a base station apparatus and a scheduling method capable of performing optimal scheduling according to the traffic situation of the base station.

  The present invention relates to a base station apparatus that performs communication with a plurality of communication terminals while switching communication rights in response to a request from the communication terminal, and calculates a traffic amount, switching means for switching the communication rights. It is characterized by comprising calculation means and adjustment means for adjusting an interval for switching the communication right based on the traffic volume.

  In the present invention, the adjustment means adjusts the communication right switching interval to be shortened when the traffic amount is larger than a predetermined value, and adjusts the communication right when the traffic amount is smaller than the predetermined value. It adjusts so that the space | interval which switches may be lengthened.

  The present invention provides a scheduling method in a base station apparatus that performs communication with a plurality of communication terminals while switching communication rights in response to a request from a communication terminal, the switching step for switching the communication rights, and a traffic volume And a adjusting step of adjusting an interval for switching the communication right based on the traffic amount.

  According to the present invention, in the adjusting step, when the traffic amount is larger than a predetermined value, the communication right switching interval is adjusted to be shortened. When the traffic amount is smaller than the predetermined value, the communication right is changed. It adjusts so that the space | interval which switches may be lengthened.

  According to the present invention, since the switching interval of the communication right assignment is adjusted according to the traffic volume, it is possible to perform optimal scheduling according to the traffic situation of the base station. In addition, since the communication right switching interval is shortened when the traffic volume is large, the user response can be improved, and when the traffic volume is small, the communication right switching interval is lengthened. The effect that the total throughput in the base station can be improved is obtained.

  Hereinafter, a base station apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 indicates that wireless communication is established with each of the mobile terminals A, B, and C, and information communication is performed by connecting the mobile terminals A, B, and C to the Internet and other communication terminals. Base station apparatus. Reference numeral 2 denotes a wireless communication unit that establishes wireless communication with each of the mobile terminals existing in its own communication area, and is connected to the mobile communication network N. Reference numeral 3 denotes a switching processing unit that performs a communication right switching process in order to perform information communication with each mobile terminal existing in its own communication area using the time division multiplexing method. Reference numeral 4 denotes a traffic amount calculation unit that calculates the traffic amount of the wireless communication unit 2. Reference numeral 5 denotes a switching interval adjusting unit that adjusts the communication right switching interval in the switching processing unit 3 based on the traffic volume. Reference numeral 6 stores in advance a setting initial value of a switching interval according to the model of the mobile terminal and the requested communication amount in order to set the communication right switching interval based on a use request (connection call) from the mobile terminal. The interval information storage unit.

  Next, the operation of the base station apparatus 1 shown in FIG. 1 will be described with reference to FIG. First, the wireless communication unit 2 monitors use requests (connection calls) transmitted from the mobile terminals A, B, and C existing in its own communication area, and determines whether or not a use request has been transmitted (step S1). , S2). When there is a use request from any of the mobile terminals A, B, and C, the switching processing unit 3 monitors the current communication right allocation status and determines whether or not there is an empty slot (step S3, S4). If the result of this determination is that there is an empty slot, the switching processing unit 3 instructs the wireless communication unit 2 to allocate this empty slot to the mobile terminal that has transmitted the use request. In response to this, the radio communication unit 2 assigns the communication right of the empty slot to the mobile terminal that has transmitted the use request (step S5).

  On the other hand, when there is no empty slot, the switching processing unit 3 sets the communication right switching interval to the switching interval adjusting unit 5 in order to switch the communication right already assigned to another mobile terminal. Instruct. In response to this, the switching interval adjustment unit 5 sets the communication right switching interval based on the use request (connection call) from the mobile terminal, and the switching interval according to the model of the mobile terminal and the requested communication volume. Is read from the interval information storage unit 6 to set the switching interval set value I1 (step S6).

On the other hand, the traffic amount calculation unit 4 constantly monitors the traffic in the wireless communication unit 2, calculates the traffic amount, and outputs the calculated traffic amount to the switching interval adjustment unit 5 (step S7). The traffic volume T calculated by the traffic volume calculation unit 4 is calculated from the equation (1).
T = B / A (1)
However, A: the number of slots in which packet calls can be used, and B: the number of calls waiting for slot allocation. According to the equation (1), when the number of calls waiting for allocation is larger than the number of usable slots, the traffic amount T is large, and when the number of calls waiting for allocation is smaller than the number of usable slots, the traffic amount T is small. Become.

Next, the switching interval adjustment unit 5 calculates a switching interval correction value I2 obtained by correcting the switching interval set value I1 set in step S6 based on the traffic amount T calculated by the traffic amount calculation unit 4, and performs a switching process. It outputs to the part 3 (step S8). A switching interval correction value I2 obtained by correcting the switching interval set value I1 is calculated from the equation (2).
I2 = I1 / T (2)
According to the equation (2), when the traffic volume T is a large value, the switching interval correction value I2 is small (communication right switching interval is shortened), and when the traffic volume T is a small value, the switching interval. The correction value I2 is adjusted to be large (the communication right switching interval is long).

  Next, the switching processing unit 3 executes the communication right switching process based on the switching interval correction value I2 calculated by the switching interval adjusting unit 5, and the communication right already assigned to the other mobile terminals. The switching is instructed to the wireless communication unit 2. In response to this, the wireless communication unit 2 switches the communication right for the mobile terminal that has transmitted the use request (step S9).

  As described above, when the traffic amount in the base station 1 is large, the communication right assignment switching interval is shortened, so that the response (user response) to the mobile terminal can be improved. Further, when the traffic amount is small, the switching interval of the communication right allocation is lengthened to reduce the number of switching processes, so that the total throughput of the base station can be improved.

  FIG. 3 is a diagram illustrating a state in which a communication right is assigned to each mobile terminal in a predetermined unit time. When the traffic amount is a large value, the communication right switching interval is shortened, so that the period in which the communication right is assigned to each mobile terminal is shortened, and the allocation waiting time in each mobile terminal can be shortened. On the other hand, when the traffic volume is a small value, the communication right switching interval becomes long, and the number of communication right switching processes within the unit time (four times in the example shown in FIG. 3) decreases. Since the time consumed for the switching process can be reduced and the time used for the communication process can be increased, the total throughput of the base station can be improved.

  The mobile terminal (portable terminal) of the present invention includes a mobile phone using mobile communication, a personal digital assistant (PDA) having a mobile communication function, a mobile terminal, a car navigation device, and the like.

  Further, the program for realizing the function of the processing unit in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed to perform scheduling processing. May be. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structure of one Embodiment of this invention. It is a flowchart which shows operation | movement of the base station 1 shown in FIG. It is explanatory drawing which shows the throughput per unit time.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base station, 2 ... Wireless communication part, 3 ... Switching processing part, 4 ... Traffic amount calculation part, 5 ... Switching interval adjustment part, 6 ... Interval information storage part, A, B, C ... Mobile terminal

Claims (4)

In response to a request from a communication terminal, a base station device that performs communication with a plurality of communication terminals while switching communication rights,
Switching means for switching the communication right;
A calculation means for calculating traffic volume;
A base station apparatus comprising: adjusting means for adjusting an interval for switching the communication right based on the traffic volume. The adjusting means includes
If the traffic volume is greater than a predetermined value, adjust the communication right switching interval to be short,
2. The base station apparatus according to claim 1, wherein when the traffic amount is smaller than a predetermined value, the base station apparatus adjusts the communication right switching interval to be longer. In accordance with a request from a communication terminal, a scheduling method in a base station apparatus that performs communication with a plurality of communication terminals while switching communication rights,
A switching step for switching the communication right;
A calculation step for calculating traffic volume;
An adjusting step of adjusting an interval for switching the communication right based on the traffic volume. The adjustment step includes
If the traffic volume is greater than a predetermined value, adjust the communication right switching interval to be short,
The scheduling method according to claim 3, wherein when the traffic amount is smaller than a predetermined value, adjustment is performed so that an interval for switching the communication right is lengthened.

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