KR20120025926A - Method for dynamically controlling speed of up link and mobile communication system for performing the same - Google Patents

Abstract

PURPOSE: A method for controlling dynamic uplink speed and a mobile telecommunication system thereof are provided to prevent the waste of wireless resources and the loss of transmission data. CONSTITUTION: A base station(220) determines the initial uplink speed of a terminal device(300). The base station receive the information of wireless environment measured by the terminal device. The base station decides the speed of the uplink about the terminal device. The base station determines an uplink speed of the terminal device. When a determined uplink speed is different from the initial uplink speed, the base station transmits the determined uplink speed information to the terminal device.

Description

Method for dynamically controlling speed of up link and mobile communication system for performing the same}

The present invention relates to a method and apparatus for varying a data transmission speed in a mobile communication network, and more particularly, to a method for dynamically controlling an uplink speed in a mobile communication network and a mobile communication system performing the method.

With the rapid development of information and communication technology, the recent mobile communication network system can transmit and receive packet data such as wireless internet and multimedia data service in addition to simply transmitting and receiving voice. For example, a third party based on the European mobile communication system Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS) and using Wideband Code Division Multiple Access (CDMA). The Universal Mobile Telecommunication Service (UMTS) system, a generational mobile communication system, provides a consistent service for the high-speed transmission of packet-based text, digitized voice or video and multimedia data to mobile phone or computer users anywhere in the world. do.

In the mobile communication system, in case of an uplink in which a terminal device transmits data to a base station, the speed, that is, the uplink speed, is a specification of the terminal device at an initial setting when the terminal device establishes a wireless connection with the base station. It is determined as the minimum value among the minimum and maximum possible speed of the uplink) and the Quality of Service (QoS) values registered for the user of the terminal device. The uplink speed cannot be changed while the terminal device is connected to the base station.

A method of determining uplink speed in a conventional mobile communication system will be described with reference to FIG. 1.

First, the terminal device 10 transmits an RRC connection request message to the radio network controller 30 through the base station 20 of the radio network for RRC (Radio Resource Control) connection for establishing a call with the radio network (S10). ). In response, the radio network controller 30 transmits an RRC connection setup message to the terminal device 10 (S20). Accordingly, the terminal device 12 transmits an RRC connection setup complete message to the radio network controller 30 (S30), and the RRC connection between the terminal device 10 and the radio network controller 30 is performed. Is set.

After the RRC connection is established, the terminal device 10 transmits an Initial Direct Transfer (IDT) message to the core network device 40 to establish a signal connection with the core network device 40 (S40).

Thereafter, after authentication and security setting are performed between the terminal device 10 and the core network device 40 (S50), the terminal device 10 requests a packet communication service to the core network device 40. The Uplink Direct Transfer) message is transmitted to the core network device 40 (S60). At this time, the UDT message includes the uplink speed information of the terminal device 10, that is, the minimum value and the maximum value information available for the uplink speed, and are transmitted to the radio network controller 30.

Next, the core network device 40 transmits a radio access bearer (RAB) assignment request (RAB assignment request) message to the radio network controller 30 (S70). Accordingly, the wireless network controller 30 stores the uplink speed information of the terminal device 10 transmitted in the step S60 and the terminal device 10 stored on the home location register (not shown). The uplink speed of the terminal device 10 is determined based on the lowest value of the guaranteed speed on QoS, which is one of the subscriber information (S80).

Thereafter, the radio network controller 30 sends an RB setup message requesting to establish a radio bearer (RB) to carry a message between the terminal apparatus 10 and the radio network controller 30. In step S90, the terminal apparatus 10 transmits the information to the terminal device 10. At this time, the uplink speed information of the terminal device 10 determined in step S80 is included in the RB configuration message and transmitted to the terminal device 10.

Therefore, after setting the radio bearer, the terminal device 10 transmits an RB setup complete message indicating completion of radio bearer setup to the radio network controller 30 (S100), and the radio network controller 30. In step S110, a RAB assignment response message is transmitted to the core network device 40.

The core network device 40 transmits a downlink direct transfer (DDT) message, which is a message for allowing packet communication, in response to the UDT message in step S60, through the radio network controller 30 and the base station 20. Transmit to 10 (S120).

Through this series of procedures, the user equipment (U-plane) is established between the terminal device 10 and the core network device 40 via the base station 20 and the radio network controller 30 (S130).

As described above, in the conventional mobile communication system, the terminal device 10 receives uplink speed information transmitted from the radio network controller 30 through the base station 20 and uses it for uplink data transmission at the initial setting. The speed cannot be changed while the terminal device 10 is packet-connected to the base station 20.

Therefore, even if the wireless environment is changed to a state in which the wireless environment may be transmitted by increasing the uplink speed, the terminal apparatus 10 may cause a waste of radio resources by performing data transmission at the initially set uplink speed. Even if the wireless environment deteriorates enough to enable normal data transmission when the uplink speed is lowered, data transmission must be performed at the initially set uplink speed, thereby causing a problem such as loss of transmitted data.

The technical problem to be achieved by the present invention is to dynamically change and control the uplink speed of the terminal device according to the state of the wireless environment, the dynamic uplink that can prevent the waste of radio resources and the loss of transmission data according to the state of the wireless environment A link speed control method and a mobile communication system performing the method are provided.

The uplink speed control method according to an aspect of the present invention,

A method of controlling an uplink speed at which a terminal device transmits data to a base station, wherein the base station determines an initial uplink speed for the terminal device while establishing an initial wireless environment with the terminal device. Transmitting to a terminal device; Determining, by the base station, information on a wireless environment measured by the terminal device to determine an uplink speed for the terminal device; And if the determined uplink speed is different from the initial uplink speed, transmitting the determined uplink speed information to the terminal device.

Mobile communication system according to another aspect of the present invention,

A mobile communication system for controlling the speed of an uplink, wherein the mobile station receives an initial uplink speed information determined by the base station while setting up an initial wireless environment and is used to transmit uplink data. A terminal device for measuring information of the terminal and transmitting the measured information to the base station; And determine the speed of the initial uplink during the setup of the initial wireless environment, transmit the initial uplink speed to the terminal device, receive information of the wireless environment measured by the terminal device, and determine a corresponding uplink speed. And a base station for transmitting the determined uplink speed information to the terminal device when the speed of the link is different from the speed of the initial uplink, wherein the terminal device is an uplink transmitted from the base station after the initial radio environment is set up. The uplink data transmission may be performed based on the speed information.

According to the present invention, it is possible to prevent waste of radio resources and loss of transmission data according to the state of the radio environment.

In addition, the speed of the downlink is also improved by dynamically changing the speed of the uplink according to the state of the wireless environment.

1 is a flowchart of a method of determining an uplink speed in a conventional mobile communication system.
2 is a diagram schematically illustrating a mobile communication system to which a dynamic uplink speed control method according to an embodiment of the present invention is applied.
FIG. 3 is a diagram illustrating an uplink speed table as an example of the storage unit illustrated in FIG. 2.
4 is a flowchart of a dynamic uplink speed control method according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an example of the uplink speed table shown in FIG. 3.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. Also, the terms " part, "" module," and " module "in the specification mean units for processing at least one function or operation and can be implemented by hardware or software or a combination of hardware and software .

Now, a dynamic uplink speed control method and apparatus thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram schematically illustrating a mobile communication system to which a dynamic uplink speed control method according to an embodiment of the present invention is applied. Here, the dynamic uplink speed control method according to an embodiment of the present invention can be applied to various types of mobile communication systems. For convenience of description, in this embodiment, UMTS (Wideband Code Division Multiple Access) is a basic structure of UMTS (Wideband Code Division Multiple Access). Universal Mobile Terrestrial System) A mobile communication system will be described as an example.

As shown in FIG. 2, the mobile communication system to which the dynamic uplink speed control method according to the embodiment of the present invention is applied includes a core network (CN) 100 and a plurality of radio network subsystems (RNS: Radio). Network Subsystem (200) and a user equipment (UE) (300).

Here, the wireless network subsystem 200 is composed of a radio network controller (RNC) 210 and a plurality of base stations (Node B) 220 again.

The core network 100 is responsible for data processing of the upper level in the mobile communication system, and handles a telephone call connection, data communication connection, etc. with the terminal device 300 through the wireless network subsystem 200, or charges and networks. Responsible for security related processing.

The wireless network subsystem 200 manages the connection between the core network 100 and the terminal device 300, and the base station 220 relays the call and the multimedia message through the wireless communication to the terminal device 300. Provides communication services such as digital broadcasting, digital media streaming, download and upload.

The wireless network controller 210 is connected to the base station 210 and controls the traffic generated between the terminal device 300 and the core network 100 to be transmitted and received to the destination through the base station 220.

The terminal device 300 refers to a user terminal subscribed to a mobile communication network, and is wirelessly connected to the base station 220 of the wireless network subsystem 200 to receive a mobile communication service through the core network 100.

In an embodiment of the present invention, the terminal device 300 is a wireless environment that is information indicating a wireless environment periodically or according to a set condition after the uplink speed is determined at initial setting after being wirelessly connected with the base station 220. The information is measured and transmitted to the base station 220.

In addition, the base station 220 receives the radio environment information transmitted from the terminal device 300 and determines the uplink speed corresponding thereto when the radio environment for the terminal device 300 determined by the radio environment information is changed. Transmit to terminal device 300.

The terminal device 300 receives the uplink speed transmitted from the base station 220 and uploads data to the base station 300 through the uplink based on the uplink speed received therefrom.

Therefore, even if the state of the wireless environment with the base station 220 changes, the terminal device 300 can perform uplink data transmission based on the uplink speed corresponding thereto, thereby wasting radio resources and transmitting data. Loss can be prevented.

In addition, the speed of the downlink is also improved by dynamically changing the speed of the uplink according to the state of the wireless environment.

FIG. 2 is a schematic block diagram of the terminal device 300 and the base station 220 shown in FIG. 1.

As shown in FIG. 2, the terminal device 300 includes a wireless communication unit 310, a measurement unit 320, a storage unit 330, and a control unit 340.

The wireless communication unit 310 performs wireless communication with the base station 220.

The measurement unit 320 measures wireless environment information indicating a state of a wireless environment formed between the base station 220 and the base station 220. The measurement unit 320 measures wireless environment information periodically or receives a control command of the controller 340 according to a set cycle to measure wireless environment information.

The storage unit 330 stores uplink speed information on which the terminal device 300 transmits uplink data to the base station 220.

The controller 340 controls the wireless communication unit 310, the measurement unit 330, and the storage unit 330 to measure and transmit wireless environment information indicating a wireless environment state to the base station 220, and from the base station 220. When the uplink speed information is transmitted, after receiving the received uplink speed information, the corresponding uplink speed information is stored in the storage unit 330, and then uplink data transmission is performed based on the uplink speed.

The base station 220 includes a wireless communication unit 221, a storage unit 222, an acquisition unit 223, a determination unit 224, and a control unit 225.

The wireless communication unit 221 performs wireless communication with the terminal device 300.

The storage unit 222 may include specification information and QoS information of the terminal device 300 used to determine the uplink speed at the initial setting of the terminal device 300, information used to determine the uplink speed after the initial setting, and Stores uplink speed information determined for the terminal device 300. Here, the information used to determine the uplink speed after the initial setting includes the radio environment information received from the terminal device 300 and the time in which the radio environment state is maintained. Such information is stored in table form, i.e., uplink rate table 400.

An example of an uplink speed table 400 is shown in the accompanying FIG. 3, and referring to FIG. 3, the uplink speed table 400 includes an uplink speed field 401, a radio environment information field 402, and a maintenance. It consists of a time field 403. However, the present invention is not limited thereto, and when there is more information necessary to determine and change the uplink speed of the terminal device 300 in the mobile communication system, a field corresponding to the uplink speed table 400 is further added. Can be.

According to the uplink speed table 400, when the value of the radio environment information stored in the radio environment information field 402 is maintained for more than the retention time in the retention time field 403, it corresponds to the corresponding uplink speed field 401. Which uplink speed is determined.

When the signal is transmitted from the terminal device 300 through the wireless communication unit 221, the obtaining unit 223 obtains wireless environment information therefrom.

The determiner 224 determines the uplink speed corresponding to the radio environment information by using the radio environment information obtained by the acquirer 223 and the uplink speed table stored in the storage unit 222. For example, the determination unit 224 may correspond to an uplink corresponding to the value of the radio environment information stored in the radio environment information field 402 of the uplink speed table 400 if the value of the radio environment information is maintained for more than the maintenance time in the retention time field 403. The uplink speed in the link speed field 401 is determined as an uplink speed corresponding to the radio environment information transmitted from the terminal device 300.

The controller 225 controls the wireless communication unit 221, the storage unit 222, the acquisition unit 223, and the determination unit 224 to determine an initial uplink speed of the terminal device 300, and further includes a terminal device ( When the wireless environment information is received from 300, the uplink speed of the terminal device 300 is determined based on this. If the uplink speed needs to be changed, the determined uplink speed information is transmitted to the terminal device 300 so as to transmit the uplink speed information. The uplink data transmission from the terminal device 300 is performed based on the link speed.

Hereinafter, a dynamic uplink speed control method according to an embodiment of the present invention will be described with reference to FIG. 4.

First, the base station 220 communicates with the terminal device 300 through an initial call setup process, for example, a packet service call (PS call) setup process as described with reference to FIG. 1. Determining the initial uplink speed for the terminal device 300 is transmitted to the terminal device 300, the terminal device 300 stores the initial uplink speed transmitted from the base station 220, and then based on the initial uplink speed base station 200 In step S100, uplink data transmission is performed. In this case, the initial uplink speed information is stored in the storage unit 222 of the base station 220 and the storage unit 330 of the terminal device 300, respectively.

Thereafter, the measuring unit 310 of the terminal device 300 measures radio environment information indicating a radio environment state formed between the base station 220 (S110). This radio environment information is measured periodically, for example with a period of 2 ms.

The control unit 340 of the terminal device 300 transmits the radio environment information measured by the measurement unit 310 to the base station 220 to report the radio environment state (S120).

The obtaining unit 223 of the base station 220 obtains radio environment information transmitted from the terminal device 300, and the determining unit 224 stores the storage environment 222 with respect to the radio environment information obtained by the obtaining unit 223. The uplink speed is determined using the uplink speed table 400 stored in step S130. That is, the determination unit 224 retrieves the radio environment information field 402 of the uplink speed table 400 corresponding to the radio environment information obtained by the acquisition unit 223, and retrieves the radio environment information field 402. The terminal apparatus 300 sets the uplink speed corresponding to the retrieved wireless environment information field 402 when the same wireless environment information is obtained by the acquisition unit 223 which is equal to or longer than the maintenance time in the maintenance time field 403 corresponding to the terminal device 300. Determine the uplink speed of. To this end, the acquirer 223 needs to acquire radio environment information transmitted from the terminal device 300 at least once.

If the uplink speed determined in step S130 is different from the uplink speed stored for the terminal device 300 in the storage unit 222, it is determined that the uplink speed should be changed (S140). The controller 225 of 220 may update and store the uplink speed determined in step S130 in the storage unit 222 corresponding to the terminal device 300 (S150), and store the determined uplink speed information in the terminal device (S150). In order to notify the notification to the 300, and transmits to the terminal device 300 (S160).

If there is a notification of the uplink speed information from the base station 220 as in step S160, the terminal device 300 extracts the uplink speed notified from the base station 220 and transfers the previous uplink to the storage unit 330. The speed is updated and stored (S170).

Therefore, the uplink data transmitted from the terminal device 300 to the base station 220 is transmitted on the basis of the uplink speed transmitted after being changed from the base station 220 in the step S160 (S180).

However, when it is determined in step S140 that the determined uplink speed is the same as the uplink speed stored for the terminal device 300 in the storage unit 222 (S140), the terminal device 300 Since there is no need to change the uplink speed of, an additional operation for changing the uplink speed is not performed.

Therefore, in this case, uplink data transmission is performed based on the previous uplink speed in step S180.

As described above, in the exemplary embodiment of the present invention, the uplink speed initially set between the terminal device 300 and the base station 220 is uplinked by the base station 220 according to the change in the wireless environment measured by the terminal device 300. Since the speed can be changed dynamically to control, the conventional problem will be solved.

Meanwhile, as described above, since the terminal device 300 needs to continuously measure and transmit radio environment information to the base station 220 for dynamic uplink speed control according to an embodiment of the present invention, the terminal device 300 is wireless. It should be further provided with a function of measuring the environmental information, and transmitting the measured wireless environmental information to the base station 220.

In addition, the base station 220 should be further provided with a function of transmitting the information of the uplink speed is changed to the terminal device 300 when the uplink speed is changed according to the radio environment information transmitted from the terminal device (300). .

In order for the terminal device 300 and the base station 220 to further include the above functions for dynamic uplink speed control according to an exemplary embodiment of the present invention, the terminal device 300 and the base station 220 may be configured to add functions in the terminal device 300 and the base station 220. There is a cost. It may be advantageous in terms of cost if the same or similar functions as the functions added above are provided for different operations, even for other services or the same service.

Recently, High Speed Downlink Packet Access (HSDPA) technology, which provides a high data rate for high speed packet data service in a wireless mobile environment, has been developed and provided. In the HSDPA technology, the terminal device determines channel quality information (CQI), which is information for determining a bit rate and a coding method of downlink data transmitted from the base station to the terminal device, to the base station. It is supposed to transmit. As such, when the CQI is transmitted from the terminal device to the base station, the base station changes the bit rate and the encoding scheme according to the CQI so that the downlink data is transmitted to the terminal device without breaking at the optimum speed with reference to the transmitted CQI.

Therefore, in the embodiment of the present invention, as described above, the CQI transmitted from the terminal device to the base station is used as the radio environment information transmitted from the terminal device 300 to the base station 220 in the HSDPA technology.

That is, in the step S120 in which the terminal device 300 transmits radio environment information to the base station 220 in FIG. 4, the terminal device 300 uses the HS-DPCCH (High Speed-Dedicated Physical Control CHannel) for the HSDPA service. It may be replaced by transmitting the CQI information to the base station 220 via. The terminal device 300 determines the CQI at intervals of about 2 ms and transmits the CQI to the base station 220 through the HS-DPCCH.

Therefore, the base station 220 determines the uplink speed through the CQI transmitted from the terminal device 300 in step S130. At this time, the base station 220 determines the uplink speed by using the uplink speed table 400 stored in the storage unit 222. At this time, the radio environment information 402 in the uplink speed table 400 is determined. Is replaced by the CQI value. An example of the uplink rate table 400 replaced with the CQI value is as shown in FIG. 5. For example, when it is determined that the CQI value transmitted from the terminal device 300 is 15 or less and the time for which the CQI value is maintained is 5 seconds or more, the corresponding uplink speed is 64 Kbps.

As such, by using a function that is already implemented in the HSDPA in the dynamic uplink speed control method according to an embodiment of the present invention, a cost for the terminal device 300 to add a function for measuring and transmitting radio environment information is generated. You will not.

In addition, for the function for transmitting the uplink speed information determined by the base station 220 in the above-described terminal to the terminal device 300, the base station 220 to the terminal 300 during the initial configuration described with reference to FIG. As in the step S90 of determining the initial uplink rate and transmitting the RB establishment request message, the embodiment also transmits the uplink rate information determined through the CQI to the terminal device 300 through the RB establishment request message. As a result, the base station 220 does not incur a cost for adding a function for transmitting the uplink rate information dynamically changed according to the CQI to the terminal device 300.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (12)

In the method for controlling the speed of the uplink that the terminal device transmits data to the base station,
Determining, by the base station, an initial uplink speed for the terminal device and transmitting to the terminal device while establishing an initial wireless environment with the terminal device;
Determining, by the base station, information on a wireless environment measured by the terminal device to determine an uplink speed for the terminal device; And
Transmitting the determined uplink speed information to the terminal device when the determined uplink speed is different from the initial uplink speed.
Uplink speed control method comprising a. The method of claim 1,
After the step of transmitting the determined uplink speed information to the terminal device, the base station continues to receive information of the new wireless environment from the terminal device, the new uplink of the determined based on the information of the new wireless environment received And when the speed is different from the speed of the uplink transmitted to the terminal device, transmitting the speed information of the new uplink to the terminal device. The method of claim 2,
In the step of determining the speed of the uplink, the base station determines the uplink speed of the terminal device when the information of the wireless environment received from the terminal device is maintained for a predetermined time or more. . 4. The method according to any one of claims 1 to 3,
The information of the wireless environment may be channel quality information (CQI) received by the base station from the terminal device for a High Speed Downlink Packet Access (HSDPA) service to the terminal device. Uplink speed control method. The method of claim 4, wherein
And the base station transmits the determined uplink speed information to the terminal device through a message requesting a radio bearer setup for the terminal device. In the mobile communication system for controlling the speed of the uplink,
A terminal device that receives initial uplink speed information determined by the base station and transmits the uplink data while setting up an initial wireless environment with a base station, and measures and transmits information of the wireless environment to the base station after the initial wireless environment setting. ; And
During the setup of the initial wireless environment, the speed of the initial uplink is determined and transmitted to the terminal device, the information of the wireless environment measured by the terminal device is received to determine a corresponding uplink speed, and the determined uplink is determined. And a base station for transmitting the determined uplink speed information to the terminal device when the speed of the different from the speed of the initial uplink,
The terminal device performs uplink data transmission based on uplink speed information transmitted from the base station after the initial radio environment is set up.
Mobile communication system, characterized in that. The method of claim 6,
The terminal device,
A measuring unit for measuring information of the wireless environment indicating a state of the wireless environment formed between the base station and the base station;
A storage unit which stores speed information of the initial uplink and uplink speed information transmitted from the base station; And
A control unit for controlling the measurement unit and the storage unit, measuring information of the wireless environment, transmitting the information to the base station, and receiving uplink speed information transmitted from the base station to control uplink data transmission
Mobile communication system comprising a. The method of claim 6,
The base station comprises:
A storage unit which stores determination information used to determine speed information of the initial uplink, speed information of the determined uplink, and speed information of the uplink;
An obtaining unit for obtaining information of a wireless environment transmitted from the terminal device;
A determination unit to determine the speed of the uplink using information of the wireless environment and the determination information stored in the storage unit; And
The storage unit, the acquirer and the determiner are controlled to determine the uplink speed, and if the determined uplink speed is different from the initial uplink speed, the determined uplink speed is transmitted to the terminal device. Control unit for controlling the speed of the uplink
Mobile communication system comprising a. The method according to any one of claims 6 to 9,
The base station continues to receive information of a new radio environment from the terminal device, and if the speed of the new uplink determined based on the information of the new radio environment received is different from the speed of the uplink transmitted to the terminal device; A mobile communication system characterized by transmitting uplink speed information to the terminal device. The method of claim 8,
The storage unit stores the determination information used to determine the speed information of the uplink in a table form,
The table may include a field corresponding to the uplink speed information, a field corresponding to the information of the wireless environment, and a field indicating a maintenance time during which the information of the wireless environment should be maintained.
Mobile communication system comprising a. 10. The method of claim 9,
The base station uses the channel quality information (CQI) received from the terminal device for the High Speed Downlink Packet Access (HSDPA) service to the terminal device as the information of the wireless environment. Characterized in a mobile communication system. The method of claim 11,
And the base station transmits the determined uplink speed information to the terminal device through a message requesting a radio bearer setup for the terminal device.

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