KR20080072135A - Apparatus and method for providing channel quality information in portable communication system - Google Patents

Abstract

An apparatus and a method for providing CQI(Channel Quality Information) in a UE(User Equipment) are provided to enable a UE to receive data for smoothly using a service by transmitting corrected CQI to a node B in case the volume of received data is smaller than a data volume required to use the service. A control part in a UE receives data from a node B(301), and instructs a channel quality management part to confirm reference CQI used for the resource allocation of the node B(303). The channel quality management part confirms the reference CQI value and provides it to the control part. Then the control part instructs a data rate measurement part to confirm an optimum data rate which is required to smoothly use the present service(305). Confirming the optimum data rate through the data rate measurement part, the control part instructs the data rate measurement part to measure a TTI(Transmission Time Interval) data rate which indicates the volume of data received during a TTI(307). Confirming the TTI data rate through the data rate measurement part, the control part compares the optimum data rate with the TTI data rate(309). In case the optimum data rate is higher than the TTI data rate, the control part compares the CQI of the present channel with the reference CQI(311). If the CQI of the present channel is worse than the reference CQI, the control part transmits the reference CQI to the node B(313).

Description

Apparatus and method for providing channel quality information in a portable terminal {APPARATUS AND METHOD FOR PROVIDING CHANNEL QUALITY INFORMATION IN PORTABLE COMMUNICATION SYSTEM}

1 is a diagram illustrating a mobile communication system for scheduling according to the prior art;

2 is a block diagram showing the configuration of a portable terminal for providing channel quality information for real-time services according to an embodiment of the present invention;

3 is a flowchart illustrating a method of providing channel quality information for providing a real-time service in a portable terminal according to an exemplary embodiment of the present invention.

The present invention relates to an apparatus and method for scheduling radio resources in a mobile communication system, and more particularly, to an apparatus and method for receiving a resource for driving a service to be used in a portable terminal.

Recently, the importance of radio resource management is increasing for the efficient use and management of radio resources in mobile communication systems for multimedia services including high speed data transmission.

In general, the radio resource management technology includes call admission control, congestion control, dynamic channel allocation, handoff, power control, rate control, packet scheduling, load sharing scheme, and automatic repeat request (ARQ). The scheme is designed for the efficient distribution of the limited resources of all communication systems to multiple users. In other words, it aims to distribute resources to meet the needs of all users at the lowest possible cost.

1 is a diagram illustrating a scheduling mobile communication system according to the prior art. In the following description, the mobile communication system is meant to include an IS-2000, WCDMA, UMTS, CDMA-2000, 1xEV-DO, HSDPA system, etc. The following description will be described with a general configuration of the above examples.

Referring to FIG. 1, the mobile communication system includes a user equipment (UE) 100 and a base station (Node B) wirelessly connected to the mobile terminal 100 and communicating through a wireless channel. 110 and a Radio Network Controller (RNC) 120 that communicates with the base station 110.

Here, the base station 110 includes a buffer and a scheduler, and can execute various scheduling algorithms on a plurality of portable terminals. As the scheduling algorithm, maximum C / I scheduling, round robin scheduling, and proportional fair scheduling have been proposed.

The maximum carrier-to-interference ratio (Max C / I) scheduling is to allocate a resource to a mobile terminal having the best wireless channel environment at the time of transmission of a transport block, and the channel quality information (CQI) transmitted from the mobile terminal Information is allocated according to the value. For example, a portable terminal having a small channel quality information (CQI) value far from a base station has a relatively low chance of resource allocation. As a result, the maximum carrier-to-interference ratio (Max C / I) scheduling is excellent in resource allocation efficiency but has a disadvantage in inferior fairness.

The round robin scheduling allocates resources to each of the portable terminals sequentially one by one, and the portable terminals having small channel quality information (CQI) value also have the same channel quality information (CQI) value. The resources can be allocated on an equal basis with large terminals, so the fairness is excellent but the efficiency is low.

The proportional fair scheduling allocates resources in consideration of fairness by weighting a portable terminal having low efficiency while considering the situation of a radio channel as in the case of the maximum C / I scheduling. However, there are complex drawbacks to implementation.

That is, the maximum carrier-to-interference ratio scheduling scheme is excellent in resource allocation efficiency but inferior in fairness, and the sequential execution scheduling scheme is excellent in fairness in resource allocation but inferior in efficiency. In addition, the proportional fair scheduling scheme is excellent in the fairness and efficiency of the resource allocation, but the disadvantage of the complexity of the scheduling implementation.

The above methods have a problem in that they cannot support the data rate required for service use by allocating resources without considering the characteristics of the portable terminal requiring resource allocation.

Accordingly, there is a need for an apparatus and method for allocating resources for enabling smooth service use in a portable terminal as described above.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for providing channel quality information for continuously providing a smooth service in a portable terminal.

Another object of the present invention is to provide an apparatus and method for transmitting channel quality information of a resource allocation time to a base station when the portable terminal determines that a channel condition is deteriorated.

According to a first aspect of the present invention for achieving the above objects, an apparatus for providing channel quality information in a portable terminal includes a transmission time interval (TTI) which is a unit for performing scheduling and an optimal transmission rate, which is a data rate required for service use; Transmission time interval measuring the transmission time interval indicating the amount of data received during the Transmission Time Interval and provides to the control unit and the reference channel quality information that is the channel quality information according to the resource allocation of the base station to provide to the control unit When the channel quality management unit compares the optimal rate measured by the rate measuring unit with the transmission time interval rate and confirms that the channel is in a deteriorated state, the reference channel quality information provided from the channel quality control unit is transmitted to the base station. Including the controller for processing to transmit It is characterized by.

According to a second aspect of the present invention for achieving the above objects, a method for providing channel quality information in a portable terminal includes the steps of identifying and storing reference channel quality information, which is channel quality information at the time of resource allocation from a base station; Measuring a transmission time interval transmission rate indicating an amount of data received during a transmission time interval (TTI) that is a unit for performing scheduling; And comparing the transmission time interval transmission rate with each other to determine the state of the channel, and if the state of the deteriorated channel is determined as a result of the determination, transmitting the reference channel quality information to the base station. .

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, an apparatus and method for providing channel quality information (CQI) for continuously providing a smooth service in a portable terminal will be described.

The reference channel quality information defined in the following description refers to channel quality information at the time when the base station receives resource allocation.

The optimal transmission rate refers to a data transmission rate required for smooth operation of a service to be used by a user of the portable terminal, and the transmission time interval transmission rate is received during one interval of a transmission time interval (TTI), which is a period for performing scheduling. Refers to the amount of data.

2 is a block diagram illustrating a configuration of a portable terminal for providing channel quality information for a real-time service according to the present invention. Herein, the portable terminal may be a cellular phone, a personal communication system (PCS), a personal data assistant (PDA), an international mobile telecommunication-2000 (IMT-2000), a fourth generation. It is meant to include all mobile communication terminals such as a broadband system, the following description will be described with a general configuration.

Referring to FIG. 2, the portable terminal includes a control unit 200, a rate measurement unit 202, a channel quality management unit 204, a memory unit 206, an input unit 208, a display unit 210, and a communication unit 212. It can be configured to include.

First, the controller 200 of the portable terminal controls the overall operation of the portable terminal. For example, when performing data processing and control for voice call and data communication, and receiving data from a base station as a data reception event occurs in accordance with the present invention in addition to the usual functions, the channel quality management unit 204 Instructs the terminal to check reference channel quality information, which is channel quality information (CQI) according to resource allocation of the base station, and transmits the channel information checked by the channel quality management unit 204 to the memory unit of the portable terminal. 206).

In addition, the control unit 200 may determine the data received during the transmission time interval (TTI), which is a unit for the transmission rate measuring unit 202 to perform the optimal transmission rate and scheduling of the service used as the portable terminal. It is instructed to measure the TTI rate indicating the amount.

Thereafter, the controller 200 compares the optimum rate with the transmission time interval rate and transmits the channel quality information to the base station.

That is, as a result of comparing the optimal transmission rate and the transmission time interval transmission rate, and when confirming a transmission time interval transmission rate less than the optimal transmission rate, the controller 200 processes to transmit previously stored reference channel quality information to the base station.

The transmission rate measuring unit 202 measures the optimal transmission rate and the transmission time interval transmission rate under the instruction of the control unit 200.

That is, the rate measuring unit 202 indicates an optimal rate for smoothly driving a service that a user wants to use, such as a real-time service of the portable terminal, and an amount of data received during a transmission time interval that is a unit for scheduling. Measure the transmission time interval rate.

The channel quality management unit 204 analyzes the state of the current channel through a pilot signal of the forward channel transmitted by the base station under the instruction of the control unit 200, generates channel quality information, and transmits the generated channel quality information to the base station. As a result, reference channel quality information, which is channel quality information according to resource allocation of the base station, is checked and provided to the controller 200.

The memory unit 206 includes a read only memory (ROM), a random access memory (RAM), and a flash ROM. The ROM stores a microcode and various reference data of a program for processing and controlling the control unit 200, the rate measurement unit 202, and the channel quality management unit 204.

The RAM is a working memory of the controller 200, and stores temporary data generated while executing various programs. In addition, the flash ROM stores various updatable storage data such as a phone book, an outgoing message, and an incoming message, and stores the reference channel quality information confirmed by the channel quality management unit 204 according to the present invention. Save it.

The input unit 208 is a numeric key buttons of 0-9, menu button (menu), cancel button (clear), confirmation button, call button (TALK), end button (END), Internet access button, navigation keys A plurality of function keys, such as (or arrow keys) buttons and a text input key, are provided, and key input data corresponding to a key pressed by a user is provided to the controller 200.

The display unit 210 displays state information generated during the operation of the portable terminal, a limited number of characters, a large amount of video and still images, and the like. The display unit 210 may use a color liquid crystal display (LCD).

The communication unit 212 performs a function of transmitting and receiving a radio signal of data input and output through an antenna (not shown). For example, in the case of transmission, after performing channel coding and spreading on the data to be transmitted, RF processing is performed to transmit the data. In the case of reception, the received RF signal is converted into a baseband signal. The baseband signal is de-spreaded and channel decoded to restore data.

The role of the rate measurement unit 202 and the channel quality management unit 204 may be performed by the control unit 200, but in the present invention is described separately configured to explain each function separately. Therefore, when the product is actually implemented, all of them may be configured to be processed by the controller 200.

The foregoing has described the configuration of a portable terminal for confirming channel quality information for a real-time service in a mobile communication system according to the present invention, and in the following description, a transmission time scheme using a portable terminal according to an embodiment of the present invention is described. A method of transmitting channel quality information according to an inter- rate and an optimal rate of a real-time service will be described.

3 is a flowchart illustrating a method of providing channel quality information for providing a real-time service in a portable terminal according to an exemplary embodiment of the present invention.

In the description, the portable terminal analyzes a current channel state through a pilot signal of a forward channel received from a base station, and then generates and transmits channel quality information (CQI) to the base station. It is assumed that the allocation is performed.

Referring to FIG. 3, the control unit 200 of the portable terminal first receives data from the base station in step 301, and then proceeds to step 303 and the channel quality management unit 204 uses the channel quality used for resource allocation of the base station. Instructs to confirm the reference channel quality information that speaks the information.

The channel quality management unit 204 instructed by the control unit 200 checks the channel quality information, that is, the reference channel quality information at the time when the resource allocation starts from the base station, and provides it to the control unit 200.

In addition, the control unit 200 that receives the reference channel quality information from the channel quality management unit 204 stores in the memory unit 206 of the portable terminal.

In operation 305, the control unit 200 instructs the rate measurement unit 202 to identify an optimal data rate indicating a data rate required for smooth operation of a service used by the user of the portable terminal.

When the transmission rate measuring unit 202 completes the confirmation of the optimal rate in step 305, the control unit 200 proceeds to step 307 and transmits the unit to which the rate measurement unit 202 performs scheduling. Instructs to measure a transmission time interval transmission rate indicating an amount of data received during one interval of a transmission time interval (TTI).

Here, in step 305 and step 307, the rate measurement unit 202, instructed by the controller 200, provides the measured rate and the transmission time interval transfer rate to the controller 200.

In operation 309, the controller 200 compares the optimal rate and the transmission time interval rate provided from the rate measurer 202.

If, as a result of the comparison of step 309, the transmission time interval transmission rate is greater than the optimal transmission rate, the controller 200 determines that the channel condition is improved, and proceeds to step 315 without correcting the channel quality information.

On the other hand, as a result of the comparison in step 309, if the transmission time interval transmission rate is less than the optimal transmission rate, the controller 200 proceeds to step 311 to compare the channel quality information of the current channel and the reference channel quality information.

If the comparison result of step 311, if the channel quality information of the current channel is better than the reference channel quality information, the control unit 200 proceeds to step 315.

On the other hand, when the comparison result of the step 311, if the channel quality information of the current channel is not better than the reference channel quality information, the control unit 200 determines that the situation of the channel deteriorated and proceeds to step 313 and step 313 The control unit 200 proceeds to obtain the reference channel quality information previously stored in the memory unit 206 of the portable terminal.

Thereafter, the controller 200 transmits the obtained reference channel quality information to the base station, and then repeats the process of step 307.

On the other hand, if it is determined in step 309 that the channel situation is improved or the channel quality information of the current channel is better than the reference channel quality information in step 311, and proceeds to step 315, the control unit 200 Check whether the end of the service being used by the user of the portable terminal is confirmed.

If, as a result of the check in step 315, the end of the service is not confirmed, the control unit 200 proceeds to step 317 to transmit the channel quality information of the current channel to the base station to continue using the service. Keep it.

On the other hand, when it is confirmed in step 315 that the end of the service, the control unit 200 terminates the algorithm.

As described above, the present invention checks and stores the channel quality information at the time of resource allocation in the portable terminal, and then determines the channel status by comparing the amount of data required for service use with the amount of data currently being received, and deteriorates the channel condition. If so, the previously stored channel quality information is transmitted to the base station (reporting better channel quality information than the worsened channel quality information), so that the portable terminal can be continuously provided with a smooth service.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, when the amount of data received by the portable terminal according to the present invention is smaller than the amount of data required for service use (when the channel situation has deteriorated), the channel quality information corrected by the base station is transmitted to receive the data. Enable data reception for services.

Claims (6)

An apparatus for providing channel quality information in a portable terminal, A transmission rate measurement unit for measuring a transmission time interval transmission rate indicating an amount of data received during a transmission time interval (TTI; transmission time interval) that is a unit for performing scheduling and a data transmission rate required for service use; A channel quality management unit checking reference channel quality information, which is channel quality information according to resource allocation of a base station, and providing the same to the controller; The control unit for processing to transmit the reference channel quality information provided from the channel quality management unit to the base station when comparing the optimal rate measured by the rate measuring unit with the transmission time interval transmission rate and confirming that the channel is in a deteriorated state. Apparatus comprising a. The method of claim 1, The control unit, When the transmission time interval transmission rate measured by the transmission rate measurement unit is less than the optimal transmission rate, it may be determined that the channel is in a deteriorated state. When the transmission time interval transmission rate is larger than the optimal transmission rate, the channel is improved. Apparatus characterized in that it can be determined as a state. The method of claim 1, The control unit, And when it is determined that the channel is in an improved state, processing to transmit channel quality information of a current channel to the base station. In the method for providing channel quality information in a portable terminal, Checking and storing reference channel quality information, which is channel quality information of a time when a resource is allocated from a base station; Measuring a transmission time interval transmission rate indicating an amount of data received during a transmission time interval (TTI) which is a unit for performing scheduling and an optimal transmission rate which is a data transmission rate required for using a service; Determining a state of a channel by comparing the measured optimal rate with the transmission time interval rate; And determining the deteriorated channel state as a result of the determination, and transmitting the reference channel quality information to the base station. The method of claim 4, wherein If it is determined that the status of the improved channel is determined, processing to transmit the channel quality information of the current channel to the base station. The method of claim 4, wherein The process of determining the state of the channel by comparing the measured optimal transmission rate and the transmission time interval transmission rate, Determining that the channel is in a deteriorated state when the transmission time interval transmission rate is less than the optimal transmission rate as a result of the comparison between the transmission time interval transmission rate and the optimal transmission rate; And determining that the channel is in an improved state when the transmission time interval transmission rate is greater than the optimal transmission rate.

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