KR101098233B1 - Wireless communication system for efficient multicast transmission using adaptive modulation and coding mechanism - Google Patents

Wireless communication system for efficient multicast transmission using adaptive modulation and coding mechanism Download PDF

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KR101098233B1
KR101098233B1 KR1020100074847A KR20100074847A KR101098233B1 KR 101098233 B1 KR101098233 B1 KR 101098233B1 KR 1020100074847 A KR1020100074847 A KR 1020100074847A KR 20100074847 A KR20100074847 A KR 20100074847A KR 101098233 B1 KR101098233 B1 KR 101098233B1
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South Korea
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mcs level
group
multicast
communication network
mcs
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KR1020100074847A
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Korean (ko)
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이종민
이주형
최준균
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한국과학기술원
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/38—Flow control; Congestion control by adapting coding or compression rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0273—Traffic management, e.g. flow control or congestion control adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP]

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed is a wireless communication system for efficient multicast transmission using Adaptive Modulation and Coding (AMC). The wireless communication system uses the proposed group MCS level decision algorithm to provide the user terminal with the most effective service through the adaptive modulation and coding mode, and to provide the maximum number of users. Provided are a wireless communication system and a multicast AMC method capable of receiving.

Description

WIRELESS COMMUNICATION SYSTEM FOR EFFICIENT MULTICAST TRANSMISSION USING ADAPTIVE MODULATION AND CODING MECHANISM

Embodiments of the present invention relate to a wireless communication system for efficient multicast transmission using Adaptive Modulation and Coding (AMC).

Adaptive Modulatio and Coding (AMC) scheme is used to efficiently use radio resources by determining different modulation and coding selection (MCS) levels according to the user's channel state in the wireless system. It is used as a technique. However, in order to apply this to a broadcasting service, that is, multicast scheme, in order to transmit a stream to all mobile terminals participating in the group, it is necessary to select and transmit a modulation and coding scheme that can be received without error by all terminals in the group. do. That is, the MCS level must be determined and sent according to the user of the worst channel state in the group. In the case of multicast, a single data stream is shared by several people in the same group, so that all users in the group can receive services in order to ensure that the users of the worst channel in the group are modulated and coded. Will be sent to you. As a characteristic of the multicast, as the number of users in the cell coverage increases, the multicast capability initially increases, and then gradually saturates. Therefore, for efficient multicast transmission in a wireless network, a technique for making the existing AMC scheme suitable for multicast transmission is required.

1 is a diagram showing the performance of a multicast transmission system when the number of users and the cell radius are different in the prior art. In graph 110, the x-axis represents the number of users in the cell range and the y-axis represents the system performance in units of 'bps / Hz'. In addition, the solid line box 120 indicates which value is analyzed / simulated according to the length of the cell radius in the graph 110. As shown in graph 110, as the number of users increases, system capacity changes initially and gradually becomes saturated. At this time, the initial change tends to increase or decrease depending on the length of the cell radius.

Various multicast grouping methods (scheduling methods) have been proposed to supplement the conventional multicast schemes. However, these grouping methods have been restricted from receiving a multicast service for mobile terminals that do not exceed certain criteria.

A system and method for effective multicast subcarrier allocation are proposed herein.

Provided are a wireless communication system and a multicast AMC method that allow a user who participates in a multicast group to receive the most effective service and at the same time allow as many users as possible to receive a multicast broadcast service.

The proposed method uses the multicast group Modulation and Coding Selection (MCS) level determination algorithm according to the saturation of the system to determine the MCS level of each group by using channel state information of UEs in the system, and the most efficient adaptive modulation and coding. A method of providing a multicast stream using an Adaptive Modulation and Coding (AMC) scheme is provided.

According to one side, the user terminal group classification unit applies the channel state information and the average data rate of each of the plurality of user terminals from the plurality of user terminals to the proposed group MCS level determination algorithm to provide a multicast stream to maximize the efficiency of the channel. .

Since the efficiency of each multicast channel should be calculated according to the multicast channel efficiency calculation algorithm and the system should be sent with the highest channel efficiency in a system congestion situation, the efficiency of radio resources can be improved by increasing the MCS level of the multicast channel with low channel efficiency. The height is provided with a wireless communication system.

It is possible to provide a multicast service to as many users as possible by ensuring that the users who participate in the multicast group receive the most effective service while maximizing the resource efficiency of the system.

1 is a diagram showing the system performance of the multicast transmission scheme when the number of users and the cell radius are different in the prior art.
2 illustrates an example of a modulation method and a distribution of a mobile terminal according to a distance from a base station based on a path loss.
3 is an example for explaining a method of extracting a multicast group MCS level using a multicast group MCS level determination algorithm according to an embodiment of the present invention.
4 is a table for explaining a relationship between an MCS level and resources allocated in a wireless communication system according to an embodiment of the present invention.
5 is a flowchart illustrating a scheduling method according to an embodiment of the present invention.

By using the proposed group Modulation and Coding Selection (MCS) level determination algorithm, effective multicast streaming can be provided for selected mobile terminals.

2 illustrates an example of a modulation method and a distribution of a mobile terminal according to a distance from a base station based on a path loss. As shown in FIG. 2, since the channel environment worsens as the distance from the base station 201 increases, data may be transmitted using lower modulation. That is, in the example of FIG. 2, data is transmitted using modulation in a sequence of quadrature amplitude modulation (QAM), 16QAM, quadrature phase shift keying (QPSK), and binary phase shift keying (BPSK) according to a distance from a base station. . 'MT1' to 'MT11' are an example showing that a total of 11 mobile terminals may be distributed as shown in FIG. 2 around a base station.

3 is an example for explaining a method of extracting a multicast group MCS level using a multicast group MCS level determination algorithm according to an embodiment of the present invention. In FIG. 3, 'M', which is the minimum MCS level among transmission rates of the first mobile terminal to the eleventh mobile terminal included in each of k groups,

Figure 112010050013587-pat00001
'Is displayed. For example, the first group 301 has a minimum MCS level of '
Figure 112010050013587-pat00002
It can have a value of 5 as'.

At this time, using the proposed group MCS level determination algorithm, it is possible to extract mobile terminals that can achieve the maximum efficiency in multicast. In the present embodiment, as shown in Figure 3, each of the minimum transmission rate '

Figure 112010050013587-pat00003
'By one by one can find the maximum grouping point that satisfies the conditions of the proposed group MCS level determination algorithm, and can transmit the multicast stream in the selected MCS mode for the selected mobile terminals.

An example of the conditions of the group MCS level determination algorithm is described below. The condition may be expressed as in the following equation. First, the group MCS level determination algorithm may determine the MCS level of the multicast group as the minimum MCS level of a user in the group in a relaxed situation in which resource saturation of the system does not exceed a predetermined saturation as shown in Equation 1 below.

Figure 112010050013587-pat00004

Here, 'k' is a multicast group index and represents a multicast group in one cell, and 'GMCS k ' is Indicates the MCS level of the k group. 'UMCS i ' represents the MCS level of user 'i', and 'U k ' is the set of users 'i' in group k.

In addition, the group MCS level determination algorithm uses the channel efficiency in consideration of channel efficiency as shown in Equations 2 and 3 when the saturation of the predetermined system exceeds a predetermined value (for example, 60%, 70%, 80%, etc.). You need to manage cast groups. This management ensures efficient multicast stream delivery to as many users as possible.

Figure 112010050013587-pat00005

Here, 'k' is a multicast group index and represents a multicast group in one cell, 'R k ' is a data rate of a multicast stream required in the k group, and 'n (MCS j , R k )'is' The number of Orthogonal Frequency Division Multiplexing (OFDM) sub-carriers required when the data rate of R k 'is provided as' MCS j '. Finally, 'N k 'denotes' MCS 'among users belonging to group k. j 'Indicates the number of users with an MCS level higher than or equal to. Therefore, the group's MCS level 'GMCS k ' can be determined as shown in Equation 3 below, and for each slot 't' (for example: 5 milliseconds for WiMAX (Worldwide Interoperability for Microwave Access)). Every second).

Figure 112010050013587-pat00006

Here, if user 'i' belongs to multicast group 'k', user 'i' will receive multicast data at the baud rate of 'GMCS k (t)' determined in the previous formula, and in the next frame 'GMCS' can be calculated by k (t + 1) '. Here, the reason why the variable MCS value is applied is that the maximum number of multicast groups within the range of not wasting radio frequency only when data is transmitted at a high efficiency among transmission rates of users included in the multicast group 'k' is used. This is because k 'users can receive data. In this case, the number of serviceable users may vary according to the transmission rate of the corresponding MCS level, and the multicast group may be configured of users capable of receiving multicast data at the MCS level.

Hereinafter, a wireless communication system and a scheduling method for providing a multicast service by the above-described method will be described with reference to FIGS. 4 to 6.

First, a multicast stream can be provided to a terminal of a corresponding group selected by using the proposed group MCS level determination algorithm through an adaptive modulation and coding (AMC) mode. That is, an effective multicast streaming can be provided through the bandwidth of the AMC mode using continuous channel feedback for the user terminals selected using the group MCS level determination algorithm.

At this time, the threshold according to the saturation degree may be set by the administrator as necessary. As described above, the MCS level of the group may be determined using the group MCS level determination algorithm, but the MCS level may be determined according to the case where the threshold value is exceeded and not exceeded. In other words, the threshold can be changed and managed by the operator of the system.

4 is a table for explaining a relationship between an MCS level and resources allocated in a wireless communication system according to an embodiment of the present invention. 4 is an example of the MCS level set defined in the 802.16 Orthogonal Frequency Division Multiple Access (OFDMA) system. That is, the table of FIG. 4 is only one example, and another set may be used for each system.

5 is a block diagram illustrating an internal configuration of a wireless communication system according to an embodiment of the present invention. As shown in FIG. 5, the wireless communication system 500 according to the present exemplary embodiment includes a status checker 510, an MCS level determiner 520, and a multicast unit 530.

The state checking unit 510 checks the congestion state of the communication network according to the multicast channel request. In this case, whether a communication network is in a congestion state may be determined based on a saturation degree of a resource and a threshold preset for the saturation degree. The preset threshold may be set by an administrator of the wireless communication system 500 as needed.

The MCS level determiner 520 determines a modulation and coding selection (MCS) level according to a congestion state of a communication network. In this case, when the communication network is in a congested state, the MCS level determiner 520 may determine the MCS level using a group MCS level determination algorithm. For example, if the above-described threshold is set to 60% and the resource saturation exceeds 60%, the wireless communication system 500 may determine that the communication network is congested, and at this time, the MCS level determination unit ( 520 may determine the MCS level using a group MCS level determination algorithm.

Here, the group MCS level determination algorithm may include an algorithm for determining the MCS level of the group based on the data rate of the multicast stream required in the group according to the multicast channel request and the MCS level of each user terminal in the group. For example, the group MCS level determination algorithm may be expressed as Equation 2 and Equation 3 described above.

In addition, when the communication network is not in a congested state, the MCS level determiner 520 may determine a minimum MCS level of each MCS level of each user terminal in the group according to the multicast channel request as the MCS level for the group. For example, if the above-described threshold is set to 60% and the resource saturation does not exceed 60%, the wireless communication system 500 may determine that the communication network is not congested. In this case, as an example, the MCS level determiner 520 may determine the minimum MCS level using Equation 1 described above.

The multicast unit 530 provides a multicast stream using the determined MCS level. In this case, the multicast unit 530 may transmit the multicast stream in the adaptive modulation and coding (AMC) mode using the determined MCS level. As described above, the multicast unit 530 may select user terminals through the determined MCS level, and may provide effective multicast streaming through the bandwidth of the AMC mode using continuous channel feedback for the selected user terminals. .

6 is a flowchart illustrating a scheduling method according to an embodiment of the present invention. The scheduling method according to the present embodiment may be performed by the wireless communication system 500 described with reference to FIG. 5.

In step 610, the wireless communication system 500 checks the congestion state of the communication network according to the multicast channel request. In this case, whether a communication network is in a congestion state may be determined based on a saturation degree of a resource and a threshold preset for the saturation degree. The preset threshold may be set by an administrator of the wireless communication system 500 as needed.

In operation 620, the wireless communication system 500 determines whether the communication network is in a congested state, and performs step 630 when the communication network is in a congested state, and performs step 640 when the communication network is not in a congested state. That is, the wireless communication system 500 determines a modulation and coding selection (MCS) level according to the congestion state of the communication network.

In operation 630, when the communication network is in a congested state, the wireless communication system 500 may determine the MCS level using a group MCS level determination algorithm. For example, when the above-described threshold is set to 60% and the resource saturation exceeds 60%, the wireless communication system 500 may determine that the communication network is congested, and at this time, the wireless communication system 500 ) May determine the MCS level using a group MCS level determination algorithm.

Here, the group MCS level determination algorithm may include an algorithm for determining the MCS level of the group based on the data rate of the multicast stream required in the group according to the multicast channel request and the MCS level of each user terminal in the group. For example, the group MCS level determination algorithm may be expressed as Equation 2 and Equation 3 described above.

In operation 640, when the communication network is not in a congested state, the wireless communication system 500 may determine a minimum MCS level among MCS levels of respective user terminals in the group according to the multicast channel request as the MCS level for the group. . For example, if the above-described threshold is set to 60% and the resource saturation does not exceed 60%, the wireless communication system 500 may determine that the communication network is not congested. In this case, as an example, the wireless communication system 500 may determine the minimum MCS level using Equation 1 described above.

In step 650 the wireless communication system 500 provides a multicast stream using the determined MCS level. In this case, the wireless communication system 500 may transmit the multicast stream in the adaptive modulation and coding (AMC) mode using the determined MCS level. As described above, the wireless communication system 500 can select user terminals through the determined MCS level and can provide effective multicast streaming over the bandwidth of the AMC mode using continuous channel feedback for the selected user terminals. .

That is, the user terminal can be selected according to the multicast channel request by using the group MCS level determination algorithm described above, and the selected user terminals can provide effective multicast streaming through the bandwidth of the AMC mode using continuous channel feedback. have.

As described above, according to the embodiments of the present invention, the user who participates in the multicast group can receive the most effective service and at the same time increase the resource efficiency of the system to provide the multicast service to as many users as possible. do.

Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

500: wireless communication system
510: status check unit
520: MCS level determination unit
530: multicast unit

Claims (13)

A status checker for checking a congestion state of a communication network according to a multicast channel request;
An MCS level determination unit for determining a modulation and coding selection (MCS) level according to a congestion state of the communication network; And
Multicast unit for providing a multicast stream using the determined MCS level
Including,
The MCS level determiner,
A group MCS level determination algorithm for determining the MCS level of the group based on the data rate of the multicast stream required in the group according to the multicast channel request and the MCS level of each user terminal in the group when the communication network is congested; And determine the MCS level using the PLL. delete delete The method of claim 1,
The MCS level determiner,
And when the communication network is not in a congested state, determining a minimum MCS level of MCS levels of respective user terminals in a group according to the multicast channel request as an MCS level for the group. The method of claim 1,
The congestion state of the communication network is determined based on a saturation of resources and a threshold preset for the saturation. The method of claim 1,
The multicast unit,
Transmitting the multicast stream in Adaptive Modulation and Coding (AMC) mode using the determined MCS level. Checking a congestion state of a communication network according to a multicast channel request;
Determining an MCS level according to a congestion state of the communication network; And
Providing a multicast stream using the determined MCS level
Including,
Determining the MCS level,
A group MCS level determination algorithm for determining the MCS level of the group based on the data rate of the multicast stream required in the group according to the multicast channel request and the MCS level of each user terminal in the group when the communication network is congested; Scheduling method for determining the MCS level using. delete delete The method of claim 7, wherein
Determining the MCS level,
When the communication network is not in a congested state, determining a minimum MCS level among MCS levels of respective user terminals in a group according to the multicast channel request as an MCS level for the group. The method of claim 7, wherein
The congestion state of the communication network is determined based on a saturation of resources and a threshold set in advance for the saturation. The method of claim 7, wherein
Providing the multicast stream,
And transmitting the multicast stream in AMC mode using the determined MCS level. Claim 13 was abandoned upon payment of a registration fee. A computer-readable recording medium having recorded thereon a program for performing the method of any one of claims 7 to 10.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100548311B1 (en) 2002-06-07 2006-02-02 엘지전자 주식회사 Transmission diversity apparatus and method for mobile communication system
JP2010507323A (en) 2006-11-01 2010-03-04 エルジー エレクトロニクス インコーポレイティド Method for transmitting and receiving paging messages in a wireless communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100548311B1 (en) 2002-06-07 2006-02-02 엘지전자 주식회사 Transmission diversity apparatus and method for mobile communication system
JP2010507323A (en) 2006-11-01 2010-03-04 エルジー エレクトロニクス インコーポレイティド Method for transmitting and receiving paging messages in a wireless communication system

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