KR20080012585A - Apparatus and method for radio resource scheduling in mobile communication system - Google Patents

Abstract

An apparatus and a method for radio resource scheduling in a mobile communication system are provided to offer a radio resource scheduling scheme which is more efficient than a round robin scheduling scheme, more fair than a maximum carrier to interference ratio scheduling scheme, and less complicated than a proportional fair scheduling scheme. An apparatus for radio resource scheduling in a mobile communication system comprises an RNC(Radio Network Controller)(230), a storage part(212), a priority calculation part(218) and a scheduler(216). The RNC(230) provides a radio priority value. The storage part(212) receives and stores the radio priority value. Also the storage part(212) receives a CQI(Channel Quality Information) value from a UE(User Equipment)(200) and stores it. The priority calculation part(218) receives the radio priority value and the CQI value from the storage part(212), executes subtraction for the two values, and creates a priority channel value. The scheduler(216) receives the priority channel value from the priority calculation part(218), determines the priority of the UE(200), and allocates radio resources according to the determined priority.

Description

Apparatus and method for scheduling radio resources in mobile communication system {APPARATUS AND METHOD FOR RADIO RESOURCE SCHEDULING IN MOBILE COMMUNICATION SYSTEM}

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

2 is a diagram illustrating a mobile communication system for scheduling according to an embodiment of the present invention;

3 is a flowchart illustrating a scheduling process of a mobile communication system according to an 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 scheduling in consideration of priority to satisfy efficiency and fairness.

Recently, the importance of radio resource management (Radio Resource Management) in the mobile communication system for multimedia services including high-speed data transmission has become important. 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 is connected to a user equipment (UE) 100 and a base station Node B, which is wirelessly connected to the user terminal 100 and communicates through a wireless channel. 110, and a Radio Network Controller (RNC) 120 communicating with the base station 110.

Here, the base station 110 may include a buffer and a scheduler, and may execute various scheduling algorithms on a plurality of user 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 user terminal having the best radio channel environment at the time of transmission of a transport block, and the channel quality information transmitted from the user terminal Allocates resources according to CQI) values. For example, a user terminal having a small value of the channel quality information (CQI) 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 user terminal sequentially one by one, and user terminals having a small value of the channel quality information (CQI) 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 giving weight to a user 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. Therefore, there is a need for a resource allocation scheduling method which is less complicated than the implementation of the proportional fair scheduling method and has superior fairness and efficiency of the resource allocation.

Accordingly, an object of the present invention is to provide an apparatus and method for scheduling resource allocation to a user terminal having a high need for resource allocation.

Another object of the present invention is to provide an apparatus and method for scheduling in consideration of priority to satisfy efficiency and fairness.

It is still another object of the present invention to provide an apparatus and method for providing a radio priority value.

According to a first aspect of the present invention for achieving the above object, in a radio resource scheduling apparatus of a mobile communication system, a Radio Network Controller (RNC) for providing a Radio Priority value, and A storage unit for receiving and storing the radio priority value from a wireless network control station and receiving and storing Channel Quality Information (CQI) value from a user terminal; and the radio priority value and channel quality information from the storage unit. A priority calculator configured to receive a value, subtract the values of the two factors, and generate a priority channel value, and receive the priority channel value from the priority calculator, and then increase the priority channel value And a scheduler for allocating the radio resources in order of priority of the terminal by determining the priority of the terminals. The.

According to a second aspect of the present invention for achieving the above objects, in a radio resource scheduling method of a mobile communication system, a radio priority value included in an active PDP context accept message is received. Storing, receiving and storing Channel Quality Information (CQI) values, receiving the Radio Priority value and Channel Quality Information value, and the two factors (Radio Priority, Channel Quality Information). Generating a priority channel value by subtracting a value of), setting a priority of the user terminal in order of increasing priority channel value, and allocating the radio resources in order of increasing priority order. It is characterized by including.

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, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention relates to a radio resource scheduling apparatus and method of a mobile communication system, and will be described an apparatus and method for scheduling in consideration of the priority of the radio resources to satisfy the fairness as well as efficiency.

2 is a diagram illustrating a mobile communication system for scheduling according to an embodiment of the present invention. Referring to FIG. 2, the mobile communication system includes a user equipment (UE) 200, a base station Node B 210, and a radio network controller RNC 230. It can be configured to include.

The user terminal 200 is wirelessly connected to the base station (Node B) 210 through a wireless channel to communicate.

The base station 210 may include a storage unit 212, a range adjustment calculator 214, a scheduler 216, a priority calculator 218, and a controller 220.

The radio network control station 230 manages one or more base stations (Node B) 210, and only one base station (Node B) 210 is shown for convenience of description. The wireless network control station 230 receives an active PDP context request message from the user terminal 200 and the base station 210, and activates an active PDP context that is a response to the message. ) Transmits the message to the user terminal 200.

The storage unit 214 receives and stores a Radio Priority value included in an Activate PDP Context Accept message from the wireless network control station 230. In addition, the storage unit 212 receives and stores Channel Quality Information (CQI) values from the user terminal 200. The channel quality information value may have a total of 32 steps from 0 to 31, and as the channel quality information value increases, it means that the channel situation is good. The radio priority value may have a total of four levels from 1 to 4, with the first level having the highest priority.

The range adjustment calculation unit 214 checks the range of the radio priority value and the range of the channel quality information value from the storage unit 212 and whether scaling is necessary to match the range of the two parameter values. Check it. When the range of the channel quality information value and the range of the radio priority value have different ranges of values, a scaling factor is calculated and multiplied by the radio priority value to match the range of information values of the two factors.

For example, if the range of the channel quality information value has a total of 32 steps from 0 to 31, and the range of the radio priority value has a total of 4 steps from 1 to 4, the range adjustment coefficient is The value of 8 calculated by dividing 32 by 4 is obtained. In addition, the range adjustment calculator 214 stores the radio priority value obtained by multiplying the range adjustment coefficient for each user terminal 200 in the storage unit 212.

The priority calculator 218 receives the radio priority value multiplied by the range adjustment factor and the channel quality information of each user terminal 200 from the storage unit 212, and subtracts the values of the two factors to give priority. Create a channel value. In addition, the priority calculator 218 transmits the priority channel value to the scheduler 216.

The scheduler 216 receives the priority channel value from the priority calculator 218, sets the priority of the user terminal 200 in the order of the highest priority channel value, and schedules the priority according to the priority. do.

The controller 220 controls the storage 212, the range adjustment calculator 214, the scheduler 216, and the priority calculator 218. That is, the controller 220 may perform the functions of the storage 212, the range adjustment calculator 214, the scheduler 216, and the priority calculator 218. In the present invention, it is shown to configure them separately to explain each function separately. Therefore, when the actual product is implemented, all of them may be configured to be processed by the controller 220, and only some of them may be configured to be processed by the controller 220.

3 is a flowchart illustrating a scheduling process of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 3, first, the storage unit 212 proceeds to step 310 and the radio priority included in an Active PDP Context Accept message from a Radio Network Controller (RNC) 230. Receive and store the value of (Radio Priority). In operation 320, the storage unit 212 receives and stores a channel quality information (CQI) value from the user terminal 200.

In operation 330, the range adjustment calculator 214 calculates a range adjustment coefficient. For example, if the range of the channel quality information value has a total of 32 steps from 0 to 31, and the range of the radio priority value has a total of 4 steps from 1 to 4, the range adjustment coefficient is The value of 8 calculated by dividing 32 by 4 is obtained.

In operation 340, the range adjustment calculator 214 multiplies the radio priority value by the range adjustment factor 8 for each user terminal 200 and stores the multiplier in the storage unit 212. In operation 350, the priority calculator 218 receives the radio priority value and the channel quality information for which the range adjustment has been completed from the storage unit 212, and receives the two factors (radio priority and channel quality information). ), The priority channel value is generated by subtracting the value of) and transmitted to the scheduler 216.

In operation 360, the scheduler 216 receives the priority channel value from the priority calculator 218, and sets the priority of the user terminal 200 in order of increasing priority channel value. do. Thereafter, the scheduler 216 proceeds to step 370 to schedule according to the priority.

The algorithm of the present invention is then terminated.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible 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, the present invention relates to a radio resource scheduling apparatus and method of a mobile communication system. Proportional Fair) It is possible to use a radio resource scheduling method with less complexity than the implementation of the scheduling method.

Claims (9)

In the radio resource scheduling apparatus of a mobile communication system, A Radio Network Controller (RNC) providing a Radio Priority value, A storage unit for receiving and storing the radio priority value from the wireless network control station and for receiving and storing Channel Quality Information (CQI) value from a user terminal; A priority calculator configured to receive the radio priority value and the channel quality information value from the storage, and to generate a priority channel value by subtracting the two parameters; And a scheduler configured to receive the priority channel value from the priority calculator, determine the priority of the user terminal in order of increasing priority channel value, and allocate the radio resources in order of increasing priority. A scheduling apparatus for a mobile communication system. The method of claim 1, The apparatus further includes a range adjusting calculator which checks the range of the radio priority value and the range of the channel quality information value from the storage unit, calculates a scaling factor, multiplies the radio priority value, and stores the multiplied radio priority value. Scheduling apparatus of a mobile communication system, characterized in that. The method of claim 2, And the range adjustment coefficient is calculated by dividing the channel quality information range value by the radio priority range value. A radio resource scheduling base station apparatus of a mobile communication system, A Radio Network Controller (RNC) providing a Radio Priority value, A storage unit for receiving and storing the radio priority value from the wireless network control station and for receiving and storing Channel Quality Information (CQI) value from a user terminal; A priority calculator configured to receive the radio priority value and the channel quality information value from the storage, and to generate a priority channel value by subtracting the two parameters; And a scheduler configured to receive the priority channel value from the priority calculator, determine the priority of the user terminal in order of increasing priority channel value, and allocate the radio resources in order of increasing priority. A scheduling base station apparatus of a mobile communication system. The method of claim 4, wherein And a range adjusting calculator for checking a range of the radio priority value and a range of the channel quality information value from the storage unit, calculating a range adjustment factor, multiplying the radio priority value, and storing the multiplied radio priority value. A scheduling base station apparatus of a mobile communication system. The method of claim 5, And the range adjustment factor is calculated by dividing the channel quality information range value by the radio priority range value. In the radio resource scheduling method of a mobile communication system, Receiving and storing a Radio Priority value included in an Active PDP Context Accept message; Receiving and storing Channel Quality Information (CQI) values; Receiving the radio priority value and channel quality information value; Generating a priority channel value by subtracting values of the two factors (radio priority, channel quality information); Setting priorities of user terminals in order of increasing priority channel values; And allocating the radio resources in ascending order of priority. The method of claim 7, wherein Before the process of receiving the radio priority value and channel quality information value, Checking a range of the radio priority value and a range of the channel quality information value; Calculating a scaling factor, And multiplying the radio priority value by the range adjustment factor to store the radio priority value. The method of claim 8, And the range adjustment factor is calculated by dividing the channel quality information range value by the radio priority range value.

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