JP2011091734A - Base station device, communication control method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress discarding and retransmission of up data of a EUL (Enhanced Up Link) call. <P>SOLUTION: A base station device 1 is applied to EUL services for increasing the power for use in data transmission in the up direction from a mobile station device to a base station device 1 under a prescribed condition, and includes a scheduler part 10 for transmitting an instruction to increase the up power of the EUL call to the mobile station device when the prescribed condition is satisfied. The base station device 1 further includes: an up data burst detection part 11 which predicts the rapid increase in a data transmission amount in a line for use in data transmission in the up direction of a DPCH (Downlink Dedicated Physical Channel) call; and an E-AGCH (Enhanced Absolute Grant Channel)/E-RGCH (Enhanced Relative Grant Channel) transmission stop part 12 which stops transmission of E-AGCH/E-RGCH of the instruction to increase the up power in the scheduler part 10 when the up data burst detection part 11 has predicted the rapid increase in a data transmission amount in the line in the up direction of the DPCH call. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a base station apparatus, a communication control method, and a program.

  Currently, as one of the W-CDMA (Wideband Code Division Multiple Access) systems of the third to 3.5th generation mobile communication systems, large-capacity high-speed packet data in the downlink direction (downlink) from the base station apparatus to the mobile station apparatus An HSDPA (High Speed Downlink Packet Access) system that provides transfer (up to a throughput of about 14 Mbps) is defined, and an operation is actually started in a W-CDMA device (see, for example, Patent Document 1).

  Furthermore, HSUPA (High Speed Uplink Packet Access) that provides high-speed, high-speed packet data transfer in the uplink direction (uplink communication speed up to 5.8 Mbps) is specified as a technology that complements this HSDPA. Has been.

  In this HSUPA service, scheduling is performed in the base station apparatus so that uplink data packets from mobile station apparatuses that are EUL (Enhanced Up Link) terminals can be received efficiently. Specifically, E-AGCH (absolute transmission rate control) is performed so as to increase or decrease the uplink power with respect to the mobile station apparatus by confirming the current situation (air condition, uplink bandwidth usage condition, etc.). Channel: E-DCH (Enhanced Dedicated Channel: Absolute Grant Channel) / E-RGCH (Relative Transmission Rate Control Channel: E-DCH Relative Grant Channel).

JP 2006-304278 A

In the HSUPA service described above, the same physical line as the EUL call is connected to the DPCH (Downlink
If the call volume of a DPCH call suddenly increases in a burst state while a Dedicated Physical Channel) call is being used, the use band reserved for uplink data of the DPCH call also increases.

  For this reason, in an EUL call using a surplus band, the uplink data is discarded in the base station apparatus. Then, in the base station apparatus, retransmission processing of the uplink data of the discarded EUL call is repeatedly performed. If the number of EUL calls is large and the amount of uplink data is large, the number of retransmissions increases, and the processing by retransmission becomes a heavy load between the base station apparatus and the mobile station apparatus.

  The present invention has been made under such a background, and an object of the present invention is to provide a base station apparatus, a communication control method, and a program capable of suppressing discard and retransmission of uplink data of an EUL call. To do.

  One aspect of the present invention is a viewpoint as a base station apparatus. That is, the base station apparatus of the present invention is applied to an EUL service that increases power used for uplink data transmission from the mobile station apparatus to the base station apparatus under a predetermined condition, and moves when the predetermined condition is satisfied. A base station apparatus including an uplink power increase instruction transmission unit that transmits an instruction to increase uplink power of an EUL call to a station apparatus, and predicts a sudden increase in data transmission amount on a line used for uplink data transmission of a DPCH call When the uplink data burst detection unit and the uplink data burst detection unit predict a sudden increase in the amount of data transmission on the uplink channel of the DPCH call, an E-AGCH / E instruction for increasing the uplink power in the uplink power increase instruction transmission unit An uplink power increase instruction transmission stopping unit that stops transmission of RGCH.

  Another aspect of the present invention is a viewpoint as a communication control method. That is, the communication control method of the present invention is applied to an EUL service that increases power used for uplink data transmission from a mobile station apparatus to a base station apparatus under a predetermined condition, and the base station apparatus has a predetermined condition. In a communication control method for executing an uplink power increase instruction transmission step of transmitting an instruction to increase uplink power of an EUL call to a mobile station apparatus when satisfied, data transmission on a line used for uplink data transmission of a DPCH call When an uplink data burst detection step for predicting a sudden increase in the amount of data and a sudden increase in the amount of data transmission on the uplink line of the DPCH call is predicted by the processing in the uplink data burst detection step, the uplink power in the processing in the uplink power increase instruction transmission step To stop transmission of E-AGCH / E-RGCH instructing to increase And power increase instruction transmission stop step, and has a.

  Still another aspect of the present invention is a viewpoint as a program. That is, the program of the present invention is installed in the information processing apparatus, thereby realizing the function of the base station apparatus of the present invention in the information processing apparatus.

  In the present invention, the possibility of a large amount of discarding in the uplink data of the EUL call is predicted due to a sudden increase in the data transmission amount of the DPCH call, and the rate of the EUL call is intentionally prevented from being increased. The processing between the base station apparatus and the mobile station apparatus can be suppressed.

It is a block diagram of a mobile communication system provided with the base station apparatus which concerns on embodiment of this invention. It is a principal block block diagram of the base station apparatus of FIG. 3 is a flowchart illustrating an operation of an uplink data burst detection unit in FIG. 2. FIG. 3 is a sequence diagram illustrating a cooperative operation of a scheduler unit, an uplink data burst detection unit, and an E-AGCH / E-RGCH transmission stop unit in FIG. 2.

(About the structure of the base station apparatus 1 which concerns on embodiment of this invention)
The configuration of base station apparatus 1 according to the embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a configuration diagram of a mobile communication system including a base station device 1. FIG. 2 is a block diagram of the main part of the base station apparatus 1. As shown in FIG.

  As shown in FIG. 1, the base station apparatus 1 communicates with a mobile station apparatus 20 that is an EUL terminal via a wireless line. In addition, the cell 30 is formed as a range in which the base station apparatus 1 and the mobile station apparatus 20 can communicate with each other while maintaining a predetermined communication quality. Thus, the mobile communication system is configured by the base station apparatus 1, the mobile station apparatus 20, and the cell 30.

  As illustrated in FIG. 2, the base station apparatus 1 includes a scheduler unit 10, an uplink data burst detection unit 11, and an E-AGCH / E-RGCH transmission stop unit 12. In addition, illustration and description are omitted about the basic functions (communication control function etc.) which the base station apparatus 1 has conventionally. The scheduler unit 10 corresponds to an uplink power increase instruction transmission unit in the claims, and the E-AGCH / E-RGCH transmission stop unit 12 corresponds to an uplink power increase instruction transmission stop unit in the claims.

  The scheduler unit 10 is a function known in Patent Document 1 and the like. That is, scheduling is performed so that uplink data from the mobile station apparatus 20 that is an EUL terminal can be efficiently received, and E-AGCH / E-RGCH instructing the mobile station apparatus 20 to increase or decrease the uplink power is transmitted. Is. In base station apparatus 1, scheduler section 10 transmits E-AGCH / E-RGCH to mobile station apparatus 20 via E-AGCH / E-RGCH transmission stop section 12 described later.

  The uplink data burst detector 11 (1): the number of DPCH calls accepted in a burst manner (for example, the number of R99 calls (PKT (Packet) / AMR (Adaptive Multi-rate) in 3GPP (Third Generation Partnership Project)) (2): Function for detecting that the average throughput of the uplink data of the current EUL call and DPCH call is a rate above a certain level, (3): Currently, base station apparatus 1 A function for detecting that the number of EUL calls and DPCH calls set to a certain number is greater than or equal to a certain value, (4): When each event is detected in each of these functions (1) to (3), the mobile station E-AGCH / E-RGCH so as to stop transmission of E-AGCH / E-RGCH (uplink power increase instruction E-AGCH / E-RGCH received from scheduler unit 10) to apparatus 20 The function of notifying the H transmission stopping unit 12 and (5): After the function of (4) is operated, when the respective events of (1) to (3) are not detected for a certain period of time, The E-AGCH / E-RGCH transmission stop unit 12 has a function of notifying the cancellation of the E-AGCH / E-RGCH transmission stop of the uplink power increase instruction received from the scheduler unit 10.

  The E-AGCH / E-RGCH transmission stopping unit 12 receives the E-AGCH / E-RGCH from the scheduler unit 10 and detects whether the mobile station device 20 is instructed to increase or decrease the uplink power. Function, receiving E-AGCH / E-RGCH from the scheduler unit 10 and transmitting it to the mobile station apparatus 20, receiving E-AGCH / E-RGCH instructing uplink power reduction from the uplink data burst detection unit 11, E-AGCH / E-RGCH received from scheduler unit 10 increases uplink power when receiving a function to transmit to mobile station device 20 and a message instructing uplink power stop from uplink data burst detection unit 12 If it is, the function of stopping transmission of E-AGCH / E-RGCH from the scheduler unit 10 is provided.

  The E-AGCH / E-RGCH transmission stop unit 12 cancels the E-AGCH / E-RGCH transmission stop from the data burst detection unit 11 by the function (5) of the uplink data burst detection unit 11. Until the notification arrives, the transmission of E-AGCH / E-RGCH from the scheduler unit 10 (increasing uplink power) is stopped.

(About operation of base station apparatus 1)
Next, the operation of the base station apparatus 1 will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the uplink data burst detection unit 11. FIG. 4 is a sequence diagram showing a cooperative operation of scheduler section 10, uplink data burst detection section 11, and E-AGCH / E-RGCH transmission stop section 12.

  (Expression 1) to (Expression 5) used by the uplink data burst detection unit 11 for determination are shown below.

Number of DPCH calls newly set in base station apparatus 1 during time Δt> α (Expression 1)
Number of DPCH calls set in the base station at time t> β (Expression 2)
Number of EUL calls set in the base station at time t>B> γ (Expression 3)
Average throughput C of uplink data of EUL call set in the base station at time t (sum of uplink data amount of EUL call / B)> θ (Expression 4)
Average throughput D of uplink data of DPCH call at time t ((sum of uplink data amount-C) / A)> ζ (Expression 5)

  Here, the time Δt represents the time from the time when the upstream data burst detector 11 was operated last time to the time when the upstream data burst detector 11 was operated this time. The time t represents the current time (the time when the uplink data burst detection unit 11 is operated this time). α, β, γ, and θ are system parameters set by the user who uses the system.

  That is, the uplink data burst detection unit 11 periodically checks whether or not the condition of (Equation 1) has occurred. If (Expression 1) is satisfied, it is detected whether there is a possibility that an event in which a large amount of cancellation occurs in the EUL call depends on whether the conditions of (Expression 2) to (Expression 5) are satisfied. To do.

  More specifically, the uplink data burst detection unit 11 detects whether or not there is a possibility of retransmission due to a sudden increase in the number of DPCH calls accepted in bursts by detecting the occurrence of the condition of (Equation 1). To do. That is, when the rapid increase in the number of accepted DPCH calls is equal to or less than the system parameter α (set by the user), the uplink data burst detection unit 11 may cause retransmission due to the rapid increase in the number of accepted DPCH calls. Is judged to be low. (On the other hand, if the rapid increase in the number of accepted DPCH calls exceeds the system parameter α set by the user, the uplink data burst detector 11 may cause retransmission due to the rapid increase in the number of accepted DPCH calls. Judged high.)

  Subsequently, the uplink data burst detection unit 11 detects the impact when retransmission is performed by grasping the number of calls by (Expression 2) and (Expression 3). That is, when the number of calls is equal to or less than the system parameters β and γ set by the user, the uplink data burst detection unit 11 has an impact when retransmission is performed (a processing increase amount of the base station device and the mobile station device). Is determined to be small. On the other hand, when the number of calls exceeds the system parameters β and γ set by the user, the uplink data burst detection unit 11 has an impact when retransmission is performed (a processing increase amount of the base station apparatus and the mobile station apparatus). Is determined to be large.

  In parallel with this, the upstream data burst detection unit 11 grasps the current upstream data usage amount in (Expression 4) and (Expression 5). That is, the uplink data burst detection unit 11 determines the impact (base station apparatus and mobile station apparatus) when retransmission is performed when the uplink data usage at the present time is equal to or less than the system parameters θ and ζ set by the user. Is determined to be small. On the other hand, when the uplink data usage amount at the present time exceeds the system parameters θ and ζ set by the user, the uplink data burst detection unit 11 performs the impact (base station apparatus and mobile station apparatus when retransmission is performed). Is determined to be large).

  Next, the operation of the uplink data burst detection unit 11 will be described with reference to the flowchart of FIG.

  START: The uplink data burst detection unit 11 proceeds to the process of step S1 when the base station apparatus 1 is activated.

  Step S1: The uplink data burst detection unit 11 determines whether or not the condition of (Equation 1) has occurred. That is, when the condition of (Equation 1) occurs (Yes in step S1), the uplink data burst detection unit 11 proceeds to the process of step S2. On the other hand, when the condition of (Equation 1) does not occur (No in step S1), the uplink data burst detection unit 11 repeatedly executes the process of step S1.

  Step S2: The uplink data burst detection unit 11 determines whether or not the conditions of (Expression 2) to (Expression 5) are satisfied. That is, when the conditions of (Expression 2) to (Expression 5) are satisfied (Yes in Step S2), the uplink data burst detection unit 11 proceeds to the process of Step S3. On the other hand, when the conditions of (Expression 2) to (Expression 5) are not satisfied (No in Step S2), the uplink data burst detection unit 11 returns to the process of Step S1.

  Step S3: The uplink data burst detection unit 11 determines whether or not an uplink power increase instruction E-AGCH / E-RGCH is received from the scheduler unit 10. That is, when the uplink data burst detection unit 11 receives the uplink power increase instruction E-AGCH / E-RGCH from the scheduler unit 10 (Yes in step S3), the uplink data burst detection unit 11 proceeds to the process of step S4. On the other hand, when the uplink data burst detection unit 11 has not received the uplink power increase instruction E-AGCH / E-RGCH from the scheduler unit 10 (No in step S3), the uplink data burst detection unit 11 returns to the process of step S1.

  Step S4: The uplink data burst detection unit 11 notifies the E-AGCH / E-RGCH transmission stop unit 12 to stop transmission of the uplink power increase instruction E-AGCH / E-RGCH received from the scheduler unit 10. The process is terminated (END).

  Next, the cooperative operation of the scheduler unit 10, the uplink data burst detection unit 11, and the E-AGCH / E-RGCH transmission stop unit 12 will be described with reference to the sequence diagram of FIG. As conventionally known, the scheduler unit 10 performs scheduling and notifies the mobile station apparatus 20 of the result as E-AGCH / E-RGCH (status ST10).

  Usually, the E-AGCH / E-RGCH from the scheduler unit 10 is received by the E-AGCH / E-RGCH transmission stop unit 12 (status ST11).

  The E-AGCH / E-RGCH transmission stop unit 12, as described later, from the uplink data burst detection unit 11, when not notified to stop transmission of the uplink power increase instruction E-AGCH / E-RGCH, the scheduler unit The E-AGCH / E-RGCH received from 10 is transmitted as it is to the mobile station apparatus 20 (status ST12).

  When the uplink data burst detection unit 11 satisfies the conditions of (Equation 1) to (Equation 5) and reaches step S4 in FIG. 3 (status ST13), transmission of E-AGCH / E-RGCH for an uplink power increase instruction Is notified to the E-AGCH / E-RGCH transmission stopping unit 12 (status ST14).

  Thereafter, when the E-AGCH / E-RGCH transmission stopping unit 12 has received the E-AGCH / E-RGCH (status ST15) in the uplink power increase instruction from the scheduler unit 10 (status ST16), this is received. Do not transmit to the mobile station device 20 (transmission stop) (status ST17). At this time, transmission of E-AGCH / E-RGCH instructed to increase uplink power is stopped, and at the same time, E-AGCH / E-RGCH instructed to decrease uplink power is moved instead of E-AGCH / E-RGCH instructed to increase uplink power. You may transmit to the station apparatus 20.

  Further, when the conditions of (Equation 1) to (Equation 5) do not occur for a certain period of time T (status ST18), the uplink data burst detection unit 11 sends the scheduler unit to the E-AGCH / E-RGCH transmission stop unit 12 10 is notified that the E-AGCH / E-RGCH transmission suspension is canceled (status ST19).

  When the E-AGCH / E-RGCH transmission stop unit 12 receives a notification (status ST19) to cancel the E-AGCH / E-RGCH transmission stop (status ST20), the uplink power increase instruction from the scheduler unit 10 Alternatively, any E-AGCH / E-RGCH instructed to reduce uplink power is transmitted to mobile station apparatus 20 (status ST21, ST22, ST23).

  The period T is a system parameter set by the user who uses this system.

(Program embodiment)
Each unit of the base station device 1 may be configured by a general-purpose information processing device (CPU (Central Processing Unit), DSP (Digital Signal Processor), microprocessor (microcomputer), etc.) that operates according to a predetermined program. . For example, a general-purpose information processing apparatus has a memory, a CPU, an input / output port, and the like. The CPU of the general-purpose information processing apparatus reads and executes a control program as a predetermined program from a memory or the like. Thereby, the function of each part of the base station apparatus 1 is realized in the general-purpose information processing apparatus.

  Even if the control program executed by the general-purpose information processing apparatus is stored in the memory or the like of the general-purpose information processing apparatus before the base station apparatus 1 is shipped, It may be stored in a memory of the information processing apparatus. Further, a part of the control program may be stored in a memory of a general-purpose information processing device after the base station device 1 is shipped. The control program stored in the memory of a general-purpose information processing device after the base station device 1 is shipped is, for example, installed from a computer-readable recording medium such as a CD-ROM. Alternatively, it may be an installed version downloaded via a transmission medium such as the Internet.

  The control program includes not only a program that can be directly executed by a general-purpose information processing apparatus, but also a program that can be executed by being installed on a hard disk or the like. Also included are those that are compressed or encrypted.

(Other embodiments)
The embodiment of the present invention can be variously modified without departing from the gist thereof. The above-described embodiment is assumed to be applied to the W-CDMA HSUPA system of the third to 3.5th generation mobile communication systems, but the application range is not limited to this. For example, in a system that performs two-way communication between two communication devices, the present invention can be applied to any system that appropriately changes the communication amount of a communication line.

(Explanation of effect)
According to the base station apparatus 1, it is assumed in advance that a large amount of uplink data of the EUL call will be discarded, and by instructing the mobile station apparatus 20 to increase the uplink data rate in advance, the uplink of the EUL call is stopped. Processing by retransmission due to data discard can be avoided, and processing of base station apparatus 1 and mobile station apparatus 20 can be reduced.

  In addition, by realizing the functions of the base station apparatus 1 with a general-purpose information processing apparatus and program, it is possible to flexibly cope with mass production and specification changes (or design changes).

DESCRIPTION OF SYMBOLS 1 ... Base station apparatus, 10 ... Scheduler part (uplink power increase instruction transmission part), 11 ... Uplink data burst detection part, 12 ... E-AGCH / E-RGCH transmission stop part (Uplink power increase instruction transmission stop part), 20 ... Mobile station device, 30 ... Cell

Claims (5)

This is applied to an EUL service that increases the power used for uplink data transmission from the mobile station apparatus to the base station apparatus under a predetermined condition. When the predetermined condition is satisfied, an EUL call is sent to the mobile station apparatus. In a base station apparatus including an uplink power increase instruction transmission unit that transmits an instruction to increase uplink power,
An uplink data burst detector for predicting a sudden increase in the amount of DPCH call data transmission on the line used for uplink data transmission;
When the uplink data burst detector predicts a sudden increase in the amount of data transmission on the uplink channel of the DPCH call, transmission of E-AGCH / E-RGCH instructing the uplink power increase instruction transmitter to increase the uplink power An uplink power increase instruction transmission stop unit for stopping
Comprising
A base station apparatus. The base station apparatus according to claim 1,
The uplink data burst detector is
Periodically confirm whether or not the number of DPCH calls set in the base station apparatus within a predetermined minute time exceeds a predetermined value,
When the number of DPCH calls set in the base station apparatus within a predetermined time exceeds the predetermined value,
A first condition that the number of DPCH calls set in the current base station apparatus exceeds a first threshold;
A second condition that the number of EUL calls set in the current base station apparatus exceeds a second threshold;
A third condition that the average throughput of the uplink data of the EUL call set in the current base station apparatus exceeds the third threshold;
A fourth condition that the average throughput of the uplink data of the DPCH call set in the current base station apparatus exceeds the fourth threshold;
Is simultaneously satisfied, it is determined that a sudden increase in the amount of data transmission on the uplink line is predicted,
A base station apparatus. Applied to an EUL service that increases power used for uplink data transmission from a mobile station device to a base station device under a predetermined condition;
In a communication control method for executing an uplink power increase instruction transmission step in which a base station apparatus transmits an instruction to increase uplink power to the mobile station apparatus when the predetermined condition is satisfied,
An uplink data burst detection step for predicting a sudden increase in the amount of data transmission on the line used for the uplink data transmission of the DPCH call;
When a sudden increase in the amount of data transmission on the uplink line of the DPCH call is predicted by the processing of the uplink data burst detection step, an instruction E-AGCH / E for increasing the uplink power in the processing of the uplink power increase instruction transmission step An uplink power increase instruction transmission stop step for stopping transmission of RGCH;
Having
A communication control method characterized by the above. The communication control method according to claim 3, wherein
The processing of the uplink data burst detection step includes:
Periodically confirm whether or not the number of DPCH calls set in the base station apparatus within a predetermined minute time exceeds a predetermined value,
When the number of DPCH calls set in the base station apparatus within a predetermined time exceeds the predetermined value,
A first condition that the number of DPCH calls set in the current base station apparatus exceeds a first threshold;
A second condition that the number of EUL calls set in the current base station apparatus exceeds a second threshold;
A third condition that the average throughput of the uplink data of the EUL call set in the current base station apparatus exceeds the third threshold;
A fourth condition that the average throughput of the uplink data of the DPCH call set in the current base station apparatus exceeds the fourth threshold;
Determining that a sudden increase in the amount of data transmission on the uplink line is predicted when
A communication control method characterized by the above. By installing on an information processing device,
Realizing the function of the base station apparatus according to claim 1 or 2,
A program characterized by that.

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