KR100865377B1 - Method for Allocating TFRC and Power in Mobile Communication System and Medium Stroing Thereof - Google Patents

Abstract

The present invention relates to a TFRC and a power allocation method and a recording medium storing the same in a mobile communication system.

To this end, the present invention, in the method for allocating TFRC (Transport Format and Resource Combination) and power in a mobile communication system, determining a range to which a Channel Quality Indicator (CQI) value (Value) belongs; Adjusting the number of Medium Access Control Dedicated Packet Data Units (Mac-d pdus) according to a range to which the determined CQI value belongs; And assigning a reference power adjustment value according to the adjusted number of Mac-d pdus.

According to the present invention, by adjusting the reference power adjustment value according to the number of padding bits for each CQI value to determine the transport block size to prevent unnecessary padding bit transmission to increase the data throughput resulting from this and maximize the efficiency of power It is effective.

CQI Value, Mac-d Pdu, Reference Power Adjustment Value, Padding Bit, Transport Block Size

Description

Method for Allocating TFRC and Power in Mobile Communication System and Medium Stroing Thereof}

1 is a diagram illustrating a conventional CQI-specific mapping table.

2 is a diagram illustrating a mapping table for each CQI according to an embodiment of the present invention.

3 is a flowchart schematically illustrating a TFRC allocation and a power allocation process for each CQI according to an embodiment of the present invention.

4 is a diagram illustrating a transport block size, a number of Mac-d pdus, and a padding bit that can be transmitted when the CQI value is 14.

FIG. 5 shows the data transmission amount (Throughput) when the base station has enough power (Case1) when the CQI value is 10 and when the base station has only 40 dBm of power for the HS-DPSCH (Case2). It is a figure compared.

를 나타낸 도면이다.6 shows a modulation method and channelization code size

The figure which shows.

7 is a flowchart illustrating a process of calculating a transport block size in a mobile communication terminal.

The present invention relates to a TFRC (Transport Format and Resource Combination) and a power allocation method and a recording medium storing the same in a mobile communication system. More specifically, the present invention relates to a method for allocating TFRC and power according to a channel quality indicator (CQI) in a base station and a recording medium storing the same.

In downlink direction transmission in a mobile communication system, that is, data transmission from a base station to a mobile communication terminal, HSDPA (High Speed Downlink Packet Access) for downloading a large amount of data at high speed is called. Technology is used. In the 3rd Generation Partnership Project (3GPP), for HSDPA, it is considered to change the modulation scheme and the turbo coding rate in accordance with the reception quality of the mobile communication terminal. In this case, it is necessary to notify the mobile communication terminal from the base station of the modulation scheme and Turbo coding rate to be used. In particular, in the AMC (Adaptive Modulation Coding) scheme that adaptively changes the modulation scheme or the Turbo coding rate, information about these modulation coding schemes is frequently reported from the base station Node-B to a mobile communication terminal (UE). (Signaling) must be done.

FIG. 1 is a diagram illustrating a conventional CQI-specific mapping table and shows a CQI mapping table for category 12 of 3GPP document TS 25.214 (Release-5, 2005-06).

Referring to FIG. 1, when a base station uses a scheduling algorithm of a TFRI (TFRI) allocation scheme, calculating a Medium Access Control Dedicated (Mac-d) pdu (Packet Data Unit) for each CQI in a specific CQI. It can be seen that there are many padding bits.

Here, the padding bit refers to a bit that is filled with no meaning in the transport block size in order to transmit the Mac-d pdu.

Therefore, in the related art, since the padding bits are filled with excessively large amounts of pads compared to the actual size of the Mac-d pdu, as shown in FIG. 1, the efficiency of power use for transmitting data at the base station is reduced and the data throughput is reduced. Occurs.

In order to solve this problem, there is provided a method for reducing excessive use of power required for data transmission in the base station and efficient data management (Throughtput) and a storage medium storing the same.

According to an aspect of the present invention, there is provided a method for allocating a transport format and resource combination (TFRC) and power in a mobile communication system, the method comprising: determining a range to which a channel quality indicator (CQI) value belongs; Adjusting the number of Medium Access Control Dedicated Packet Data Units (Mac-d pdus) according to the determined range of the CQI value; And assigning a reference power adjustment value according to the adjusted number of Mac-d pdus.

In addition, the present invention provides a recording medium storing a program relating to a method for allocating TFRC and power in a mobile communication system, the function comprising: determining a range to which the CQI value belongs; Adjusting the number of Mac-d pdus according to the range to which the determined CQI value belongs; And assigning a reference power adjustment value according to the adjusted number of Mac-d pdus.

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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. 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.

In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

In the embodiment of the present invention, a synchronous CDMA mobile communication system using a Pseudo Noise (PN) code is assumed and described. However, the present invention is not limited thereto, and the present invention is applicable to all WCDMA mobile communication systems using a primary scrambling code (PSC). That is, instead of the PN code used in the embodiment of the present invention, the WCDMA mobile communication system may be replaced with PSC.

2 is a diagram illustrating a mapping table for each CQI according to an embodiment of the present invention, FIG. 3 is a flowchart illustrating a TFRC allocation and power allocation process for each CQI according to an embodiment of the present invention, and FIG. 4 is a CQI value. 14 shows a transport block size that can be transmitted, the number of Medium Access Control Dedicated (Mac-d) packet data units (pdus), and padding bits.

The embodiment of the present invention is applied to each CQI value of the CQI mapping table for category 12 (see FIG. 1) included in the 3GPP document TS 25.214 (Release-5, 2005-06) referred to in the prior art for convenience of description. This will be described. Here, although the embodiment of the present invention has been described by applying to the CQI mapping table for category 12, the present invention is not limited thereto and may be applied to various categories.

First, the operating principle of the present invention will be described with reference to FIG. 4.

Index 121 of FIG. 4 represents a transport block size, a Mac-d pdu number, and padding bits used when the CQI value is 14 in FIG. 1.

Conventionally, when the CQI value is 14, 210 bits of padding bits are generated in a process of matching a transport block size having a predetermined size to transmit 7 Mac-d pdus, and power in the process of transmitting unnecessary padding pits generated at this time. Waste is generated. The padding bit generated is quite large, considering that one Mac-d pdu is generally 336 bits.

Therefore, in the embodiment of the present invention, for example, when the conventional CQI value is 14, a little reference power adjustment value is further allocated to increase the number of Mac-d pdus to be transmitted, and unnecessary padding bits are transmitted. Suggest ways to reduce it.

In more detail, in the embodiment of the present invention, if the padding bit is relatively large as compared to 336bit corresponding to one Mac-d pdu, as in the CQI value of 14, the number of Mac-d pdus to be transmitted is increased to eight and eight Mac-ds are transmitted. As the number of Mac-d pdus to be transmitted increases, the number of Mac-d pdus is increased while the number of transmission blocks of the CQI index '124' having the smallest padding bits among the CQI indexes that can transmit the pdu is allocated. It becomes possible.

In contrast, when the padding bit is relatively small compared to 336 bits corresponding to one Mac-d pdu, the embodiment of the present invention maintains the number of Mac-d pdus to be transmitted and has the smallest padding among the CQI indices capable of transmitting the retained Mac-d pdus. It is possible to reduce the power and padding bits consumed by allocating as many reference power adjustment values as can transmit the transport block size of the CQI index with bits.

Hereinafter, a TFRC allocation and power allocation process for each CQI according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

First, the CQI value is checked (S310). Here, the CQI value is 0 to 30, and means an index indicating the reception quality of the mobile communication terminal that the base station receives from the mobile communication terminal.

The base station controller preferably stores TFRC (Transport Format and Resource Combination) and power allocation information for transmitting data to the mobile communication terminal for each CQI value. Here, TFRC is used to map a transport block size, a corresponding power, and a radio resource.

Subsequently, it is determined whether the range to which the CQI value belongs is 7 or less or 16 or more (S320).

If it is determined in step S320 that the CQI value is 7 or less, it is determined whether there is a Mac-d pdu to be transmitted to the mobile communication terminal (S321).

In this case, the reason for determining whether there is a Mac-d pdu to be transmitted to the mobile communication terminal is that even if there is no Mac-d pdu to transmit, since the base station allocates a specific size of a transmission block size to the mobile communication terminal, unnecessary padding bits (Padding bit) Is generated, unnecessary power is consumed and data throughput is reduced.

Subsequently, if it is determined in step S321 that there is no Mac-d pdu to transmit, the number of Mac-d pdus is increased by '1' (S323), and the reference power adjustment value that is enough to transmit the increased Mac-d pdu for each CQI value is determined. Assign (S370). At this time, in the embodiment of the present invention, it is preferable to increase the number of Mac-d pdus by '1'.

As shown in FIG. 2, in the embodiment of the present invention, when the CQI is 4 or less, the Mac-d pdu is increased by '1' to reduce unnecessary padding bits, and the reference power adjustment value is adjusted for each CQI. In this case, the lower the CQI, the lower the reception quality of the mobile communication terminal. Therefore, when the CQI is low, the reference power adjustment value is largely allocated, and when the CQI is high, the reference power adjustment value is relatively low.

If it is determined in step S321 that there is a Mac-d pdu to be transmitted, the number of Mac-d pdus is maintained (S325), and a reference power adjustment value is allocated as much as the transmission of the Mac-d pdu for each CQI value (S370). .

Therefore, in the embodiment of the present invention, when the CQI value is 7 or less, the number of Mac-d pdus is the same, and only the reference power adjustment value for transmitting the Mac-d pdu is changed according to the CQI value. That is, when the CQI value is 7 or less, the transport block size is fixed at 377 bits and the padding bit is fixed at 20, which wastes less padding bits than in FIG.

Here, the relationship between the transport block size, the number of Mac-d pdus, and the padding bits can be expressed by a simple equation as follows.

For example, when the CQI value of FIG. 3 is 1, the total transport block size is 377 bits (= 1 X 336 bit + 20 + 21).

If it is determined in step S320 that the CQI value is 16 or more, the number of Mac-d pdus is increased for each CQI value (S327), and the reference power adjustment value is allocated as much as the transmission of the increased Mac-d pdu (S370). . At this time, in the embodiment of the present invention, it is preferable to increase the number of Mac-d pdus by '1'.

In this case, when the CQI value is 16 or more, the reception quality of the mobile communication terminal is high. The maximum transmission block size that the base station can transmit to the mobile communication terminal is 3440 bit, and the maximum number of Macd-d pdus allocated through 3440 bit is 10. Will increase.

At this time, the generated padding bit is constant at 59 bits, and a reference power adjustment value is preferably allocated differently for each CQI value.

If it is determined in step S320 that the CQI value is one of 8 to 15, it is determined whether the padding bit of the corresponding CQI value is greater than or equal to the minimum padding bit threshold (S330). Here, in the embodiment of the present invention, the lowest padding bit threshold is preferably 119 bits.

If the padding bit of the corresponding CQI value is less than the lowest padding bit threshold in step S330, the number of Mac-d pdus of the corresponding CQI value is maintained (S333), and the reference power adjustment value is allocated as much as the transmission of the number of Mac-d pdus (S333). S370).

Referring to FIG. 2, when the CQI value is 8, the padding bit is reduced to 6 by reducing the transmission block size to 699 bits by keeping the number of Mac-d pdus at 2 and reducing the reference power adjustment value by about -0.4 dB. You can.

In addition, when the CQI value is 11, the padding bit can be reduced to 15 by reducing the transmission block size to 1380 bits by keeping the number of Mac-d pdus as 4 and reducing the reference power adjustment value by '-0.45 dB'.

In addition, when the CQI value is 12, the number of Mac-d pdus is maintained at 5 and the reference power adjustment value is maintained at '0 dB' as in the prior art. In this case, when the CQI value is 12, since the padding bit can no longer be reduced by adjusting the reference power adjustment value, '0dB' is maintained.

If it is determined in step S330 that the padding bit of the corresponding CQI value is greater than or equal to the lowest padding bit threshold, it is determined whether the padding bit of the corresponding CQI value is greater than or equal to the highest padding bit threshold (S340). Here, in the embodiment of the present invention, the highest padding bit threshold is preferably 274 bits.

If the padding bit of the corresponding CQI value is less than the highest padding bit threshold in step S340, the number of Mac-d pdus of the corresponding CQI value is increased (S343) and a reference power adjustment value is allocated as much as the number of Mac-d pdus to be transmitted (S343). S370). At this time, in the embodiment of the present invention, it is preferable to increase the number of Mac-d pdus by '1'.

Referring to FIG. 2, when the CQI value is 9, the padding bit is reduced to 7 by increasing the number of Mac-d pdus to 3 and increasing the transmission power size to 1036 bits by increasing the reference power adjustment value by about +0.35 dB. You can.

In addition, when the CQI value is 10, the padding bit can be reduced to 15 by increasing the number of Mac-d pdus to 4 and increasing the reference power adjustment value by about +0.55 dB to increase the transmission block size to 1380 bits.

In addition, when the CQI value is 13, the padding bit can be reduced to 31 by increasing the number of Mac-d pdus to 7 and increasing the transmission power block size to 2404 bits by increasing the reference power adjustment value by '+ 0.43dB'.

Here, when the CQI value is 13, the embodiment of the present invention is described only by increasing the number of Mac-d pdus. However, when the power to allocate is insufficient, the reference power adjustment value is maintained while maintaining the number of Macd-d pdus as 6; It is also possible to reduce the padding bit to 9 by lowering it by -0.4dB.

In addition, when the CQI value is 14, the padding bit can be reduced to 17 bits by increasing the number of Mac-d pdus to 8 and increasing the transmission block size to 2726 bits by increasing the reference power adjustment value by '+0.21 dB'.

If it is determined in step S340 that the padding bit of the corresponding CQI value is greater than or equal to the highest padding bit threshold, the reference power adjustment value is sufficient to maintain the number of Mac-d pdus of the corresponding CQI value and transmit the number of Mac-d pdus (S345). It allocates (S370).

Referring to FIG. 2, when the CQI value is 15, the padding bit is reduced to 45 by reducing the transmission block size to 3090 bit by keeping the number of Mac-d pdus at 9 and reducing the reference power adjustment value by '-0.28 dB'. You can.

When using the method according to an embodiment of the present invention will be described by comparing the results of the data throughput in the cell in charge of the power and the base station compared with the prior art.

The basic power allocation formula is:

는 HS-DSCH 데이터를 전송하기 위해 사용되는 하향 물리채널에 할당되는 전력을 의미하고,

는 공통파일럿 채널에 할당되는 전력을 의미하고,

는 측정 전력 옵셋을 의미하고,

는 CQI 값 별 전송 블록 크기를 전송하기 위한 전력을 의미한다. 여기서,

는 7dB이고

는 33dBm으로 고정된 값인 것이 바람직하다.here

Means power allocated to a downlink physical channel used for transmitting HS-DSCH data,

Is the power allocated to the common pilot channel,

Means the measured power offset,

Denotes power for transmitting a transport block size for each CQI value. here,

Is 7 dB

Is preferably a fixed value of 33 dBm.

FIG. 5 illustrates the data throughput of the case where the base station has sufficient power (Case1) when the CQI value is 10 and when the base station has only 40 dBm of power for the HS-DPSCH (Case2). It is a figure compared.

Referring to FIG. 5, in the present invention, if the power of the base station is sufficient (Case1), the data throughput is high, and if the base station does not have enough power (Case2), the base station transmits the same data transmission amount by transmitting lower than the existing implemented power. Can be. Accordingly, in the present invention, a TFRI (Transport Format and Resource Indicator) may be selected to obtain a maximum data transmission amount with minimum power.

를 나타낸 도면이고, 도 7은 이동통신 단말기에서 전송 블록 크기를 계산하는 과정을 나타낸 흐름도이다.6 shows a modulation method and channelization code size

7 is a flowchart illustrating a process of calculating a transport block size in a mobile communication terminal.

First, the mobile communication terminal performs HS-SCCH monitoring and HS-PDSCH decoding (S710). Here, the HS-SCCH is a downlink channel used by the base station to transmit control information necessary for the mobile communication terminal to receive packet data transmitted through the HS-DSCH (High Speed Downlink Shared Channel) and control information for other purposes.

Herein, the mobile communication terminal uses Adaptive Modulation & Coding (AMC) and Hybrid Automatic Repeat Request (HARQ) to decode the HS-PDSCH from the base station through the HS-SCCH.

를 수신하여 전송 블록 크기를 계산할 수 있게 된다.Receive the transport block size, code set size, and the like. In addition, the mobile communication terminal of 6bit

It is possible to calculate the transport block size by receiving.

를 이용하며,

는 아래의 수학식으로 표현할 수 있다.In this case, the mobile terminal acquires the argument to calculate the transport block size.

Using

Can be expressed by the following equation.

는 이동통신 단말기에서 저장되어 있는 값으로 도 6과 같이 모듈레이션 방법과 코드 셋의 크기에 의해서 결정된다.here,

Is a value stored in the mobile communication terminal and is determined by the modulation method and the size of the code set as shown in FIG.

를 계산하고(S730), [수학식 3]을 이용하여

를 계산한다(S750).Subsequently, the mobile communication terminal uses the AMC, HARQ, transport block size, and code set size received from the base station.

To calculate (S730), using [Equation 3]

To calculate (S750).

Subsequently, the mobile communication terminal calculates a transport block size using the following equation (S770).

가 23이라고 가정하기로 한다. For example, it is assumed that the mobile communication terminal receives a scheduled transport block size having a CQI value of 10. In this case, the modulation method transmitted by the base station to the mobile communication terminal is Quadrature Phase Shift Keying (QPSK), the channelization code is 3 and

Let is assumed to be 23.

를 계산한다. 이때,

는 도 6를 참조하면 63임을 알 수 있다.First, the mobile communication terminal uses the received modulation information and the number of channelization codes.

Calculate At this time,

Referring to FIG. 6, it can be seen that 63.

와 수신된

를 입력값으로 하고 [수학식 4]를 이용하여 전송 블록 크기를 계산할 수 있게 된다.Subsequently, the mobile communication terminal calculates

Received with

As an input value, the transport block size can be calculated using Equation 4.

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

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.

As described above, according to the present invention, by adjusting the reference power adjustment value according to the number of padding bits for each CQI value to determine the transport block size to prevent unnecessary padding bit transmission, Increase throughput and maximize power efficiency.

Claims (15)

In the method for allocating TFRC (Transport Format and Resource Combination) and power in a mobile communication system, Determining a range to which a channel quality indicator (CQI) value belongs; Adjusting the number of Medium Access Control Dedicated Packet Data Units (Mac-d pdus) according to the determined range of the CQI value; And Allocating a reference power adjustment value according to the adjusted number of Mac-d pdus TFRC and power allocation method comprising a. The method of claim 1, The adjusting step In the determining step, if the CQI value is within a preset threshold range, determining whether a corresponding padding bit of the CQI value is greater than or equal to a minimum padding bit threshold. TFRC and power allocation method further comprising. The method of claim 2, If the corresponding padding bit of the CQI value is less than the lowest padding bit threshold in the determining whether or not the minimum padding bit threshold is greater than or equal to the minimum padding bit threshold, the corresponding Mac-d pdu number of the CQI value is maintained and the corresponding Mac-d pdu number of the CQI value is determined. TFRC and power allocation method for assigning a reference power adjustment for transmission. The method of claim 2, If the corresponding padding bit of the CQI value is greater than or equal to the lowest padding bit threshold, determining whether the corresponding padding bit of the CQI value is greater than or equal to the highest padding bit threshold. TFRC and power allocation method further comprising. The method of claim 4, wherein If the corresponding padding bit of the CQI value is less than the highest padding bit threshold in the determining whether the maximum padding bit threshold is greater than or equal to the maximum padding bit threshold, the number of corresponding Mac-d pdus of the CQI value is increased and the increased number of Mac-d pdus is increased. TFRC and power allocation method for assigning a reference power adjustment for transmission. The method of claim 4, wherein If the corresponding padding bit of the CQI value is greater than or equal to the highest padding bit threshold in determining whether the highest padding bit threshold is greater than or equal to the highest padding bit threshold, the corresponding number of Mac-d pdus of the CQI value is maintained and the sustained number of Mac-d pdus is transmitted. TFRC and power allocation method for allocating a reference power adjustment value. The method of claim 1, The adjusting step In the determining step, if the CQI value is less than or equal to a preset threshold range, determining whether there is a Mac-d pdu to transmit the CQI value. TFRC and power allocation method further comprising. The method of claim 7, wherein If there is a Mac-d pdu to transmit the CQI value in the step of determining whether there is a Mac-d pdu to transmit, maintaining the corresponding Mac-d pdu number of the CQI value and transmitting the maintained Mac-d pdu number TFRC and power allocation method for allocating a reference power adjustment for the control. The method of claim 7, wherein In determining whether there is a Mac-d pdu to be transmitted, if there is no Mac-d pdu to transmit the CQI value, the number of Mac-d pdus of the CQI value is increased and the increased number of Mac-d pdus is transmitted. TFRC and power allocation method for assigning reference power adjustments. The method of claim 1, In the determining, if the CQI value is greater than or equal to a predetermined threshold range, the TFRC increases the number of Mac-d pdus of the CQI value and allocates a reference power adjustment value for transmitting the increased number of Mac-d pdus. And power allocation method. The method of claim 6, The threshold range is a CQI value ranging from 8 to 15, The lowest padding bit threshold is 119 bits, And the highest padding bit threshold is 274 bits. The method of claim 11, If the CQI value is 7 or less in the step of determining the range to which the CQI value belongs, the transport block size while transmitting one Mac-d pdu-where the transport block size is the number of bits that the base station can transmit to the mobile communication terminal TFRC and power allocation method that selects 377 bits. The method of claim 11, If the CQI value is 16 or more in the step of determining the range to which the CQI value belongs, the transport block size while transmitting 10 Mac-d pdus, where the transport block size is the number of bits that the base station can transmit to the mobile communication terminal TFRC and power allocation method that selects-means 3440 bits. The method of claim 1, The assigning step TFRC and power allocation method for selecting a transport block size of the minimum size for transmitting the adjusted number of Mac-d pdu, and assigning a reference power adjustment value for transmitting the selected transport block size. In a recording medium in which a program relating to a TFRC (Transport Format and Resource Combination) and a method of allocating power in a mobile communication system is stored, Determining a range to which a channel quality indicator (CQI) value belongs; Adjusting the number of Medium Access Control Dedicated Packet Data Units (Mac-d pdus) according to the determined range of the CQI value; And A function of assigning a reference power adjustment value according to the adjusted number of Mac-d pdus Record medium that stores the program to implement.

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