KR100826518B1 - Method for return data transmission using cooperative transmission schemes in broadcasting systems, and method for management of return data transmission - Google Patents

Abstract

A method for transmitting reverse data by using a cooperative transmission scheme in a broadcasting system, and a method for managing the reverse data transmission therefor are provided to perform the reverse data transmission through the cooperative transmission scheme based on mutual cooperation between at least two terminals in a terrestrial broadcasting system, thereby improving reverse channel transmission capability, channel capacity, and service coverage without the installation of a separate repeater. A method for managing reverse data transmission using a cooperative transmission scheme in a BS(Base Station) comprises the following steps of: notifying a broadcasting receiving terminal that the broadcasting receiving terminal transmits reverse data by applying a determined cooperative transmission scheme, wherein the broadcasting receiving terminal determines that the cooperative transmission scheme is suitable to the transmission of reverse data out of broadcasting receiving terminals in the service area of the BS(300); receiving information about adjacent terminals to form a cooperative relation from the broadcasting receiving terminal(302); allocating frequency resources for a use in the cooperative transmission scheme to the adjacent terminals forming the cooperative relation(303); and receiving the reverse data from the broadcasting receiving terminal and the adjacent terminals forming the cooperative relation to restore the optimal reverse data(305).

Description

Method for return data transmission using cooperative transmission schemes in broadcasting systems, and method for management of return data transmission

1 is a diagram illustrating a reverse data transmission method in a conventional terrestrial broadcasting system;

2 is an explanatory diagram for a reverse data transmission method using a complementary transmission method and a reverse data transmission management method therefor according to the present invention;

3 is a flowchart illustrating a reverse data transmission method using a complementary transmission method and a reverse data transmission management method therefor in the terrestrial broadcasting system according to the present invention.

* Explanation of symbols on the main parts of the drawing

200: base station 211 to 215: broadcast receiving terminal

The present invention relates to a reverse data transmission method using a mutual aid transmission method in a broadcast system and a reverse data transmission management method therefor, and more particularly, to a plurality of broadcast receiving terminals in reverse data transmission for a bidirectional service of a broadcast system. By using a coherent transmission scheme based on mutual cooperation between them, a broadcast system that can improve the transmission capability of an existing reverse channel and can improve (improv) reverse channel capacity and service range without a separate repeater. The present invention relates to a reverse data transmission method using a transmission method and a reverse data transmission management method therefor.

FIG. 1 is a diagram illustrating a reverse data transmission method in a conventional terrestrial broadcasting system, and represents a case where broadcast receiving terminals B, D, and E (112, 114, 115) want to transmit data through a reverse channel. Hereinafter, the 'broadcasting terminal' is simply referred to as 'terminal'.

In a general broadcasting system, an area 10 in which one base station provides a service is very large. Accordingly, the conventional reverse channel transmission scheme is designed in consideration of a case in which a terminal far from the base station transmits a reverse signal.

In addition, in the conventional scheme, a direct data transmission link is formed between all the terminals 111 to 115 and the base station 100 in the region 10 in which one base station 100 provides a service. That is, in the conventional method of transmitting data (reverse data) through the reverse channel, it is known that there is a one-to-one direct signal transmission channel between each terminal and the base station existing in one service area (area provided by one base station). I assume.

Therefore, the serviceable range is inevitably limited, and in the case of the terminal located in the outermost area of the service area, the reverse channel data transmission rate is low due to the limitation of the transmission power, and also the terminal of the terminal having a poor channel quality between the terminal and the base station. Even if the reverse channel data transmission rate is lowered. That is, when the signal attenuation in the transmission channel between the base station and the terminal is large, the data transmission rate is low.

In the conventional data transmission method through the reverse channel, there may be a method of installing a repeater as a method for improving the service range or improving the reverse channel data transmission speed, but in the case of installing the repeater in this way And there is a problem that the cost (installation / maintenance costs) according to the operation is high.

The present invention has been proposed to solve the above-mentioned problem, and in the broadcast system, the reciprocal transmission scheme in the broadcast system can improve the reverse channel transmission capacity and expand the service area in the reverse data (data through the reverse channel) transmission scheme. It is an object of the present invention to provide a reverse data transmission method using the same and a reverse data transmission management method therefor.

That is, the present invention, by using a mutual transmission method based on the mutual cooperation between a plurality of terminals in the reverse data transmission for the bidirectional service of the broadcast system, not only improves the transmission capability of the existing reverse channel, but also It is an object of the present invention to provide a reverse data transmission method using a complementary transmission method and a reverse data transmission management method for the broadcast system, which can increase a reverse channel capacity and improve a service range without a repeater.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention provides a method for managing reverse data transmission in a base station of a broadcasting system, the method comprising: A transmission method determination step of notifying the transmission of reverse data by applying a mutual aid transmission method; Neighboring terminal information receiving step of receiving information on the neighboring terminal to form a mutual relationship from the broadcast receiving terminal; A frequency allocating step of allocating frequency resources to be used for the mutual transmission scheme to neighboring terminals having a mutual relation; And a reverse data receiving step of receiving the reverse data from the broadcast receiving terminal and the neighboring terminal having the mutual relationship and restoring the optimal reverse data.

On the other hand, the present invention, in the reverse data transmission method in the broadcast receiving terminal requesting the mutual transmission, the transmission method notification step of receiving a notification to transmit the reverse data by applying the mutual transmission method from the base station; A neighbor terminal search step of broadcasting a correlation request signal to search for a neighbor terminal to form a correlation; A neighboring terminal reporting step of transmitting information on a neighboring terminal in response to the correlation request signal to the base station; A frequency allocation step of allocating a frequency resource to be used for a homogeneous transmission scheme from the base station; And transmitting backward data to the neighboring terminal in response to the base station and the correlation request using the allocated frequency resource.

On the other hand, the present invention, in the reverse data transmission method of the neighboring broadcast receiving terminal in response to the request for a mutual transmission, the response step of receiving a response to the mutual correlation request signal broadcasted by the broadcast receiving terminal requesting the mutual transmission ; A frequency allocation step of allocating a frequency resource to be used for a premature transmission scheme from a base station; And a data forwarding step of receiving reverse data from the broadcast receiving terminal requesting the premature transmission and transmitting the reverse data to the base station using the allocated frequency resource.

In the present invention, the reverse channel capacity and the transmission performance can be improved by applying the 'manual transmission method' based on cooperation between terminals in the reverse data transmission method. That is, when a terminal wants to transmit a reverse channel signal (reverse data), if it transmits a reverse channel signal together with neighboring terminals by a mutual transmission scheme, the reverse direction is performed by the cooperative Transmit Diversity. The transmission performance of the channel signal is improved or the reverse channel capacity is increased by a cooperative Multiple Input Multiple Output (MIMO) transmission technique.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an explanatory diagram for a reverse data transmission method using a mutual aid transmission method and a reverse data transmission management method therefor according to the present invention.

The present invention improves reverse channel transmission performance and capacity by applying a coherent transmission method based on cooperation between terminals in a reverse data transmission method for additionally providing a bidirectional service to a broadcast system.

Here, the reciprocal transmission scheme may include transmit diversity techniques such as space-time coding (STC), space-frequency coding (SFC), and space-time-frequency coding (STFC) for two or more transmit antennas, or MIMO. (Multiple Input Multiple Output) A method of simultaneously transmitting two or more transmission signal strings generated by a beam forming technique or two terminals simultaneously and in parallel to each other. A diver larger than the number of transmission antennas installed in each terminal. City gain or transmission capacity increase can be obtained.

In the case of the terminal D 214 and the terminal E 215, it is possible to operate with the existing reverse data transmission method, but in the present invention, the transmission performance is further improved by applying the 'transmit diversity scheme' among the preliminary transmission methods. In addition, by applying the 'MIMO technique', the reverse channel capacity can be further improved. Meanwhile, when the beamforming technique is applied, both transmission performance and channel capacity can be improved.

For example, a case in which a mutual aid STC is applied between two neighboring terminals (terminals D and E) will be described. When terminal D 214 intends to transmit data, S.M. Alamouti proposes for two antennas proposed in a paper entitled "A simple transmit diversity technique for wireless communications" (IEEE Journal on Selected Areas of Communications, Vol. 16, No. 8, pp. 1451-1458, Oct. 1998). After generating two transmission signal strings by applying the STC, one of the transmission signal strings is transmitted to the neighboring terminal E (215).

Thereafter, transmission diversity may be implemented by simultaneously transmitting the two signal strings generated by the terminal D 214 and the terminal E 215 to the base station 200 at the same time.

On the other hand, if MIMO is used instead of STC, the data transmission rate can be obtained up to twice as high as the case of not applying the premature transmission scheme. As an example of applying complementary MIMO, R.U. Nabar, H. Blcskei, F.W. Kneubhler's paper entitled "Fading relay channels: Performance limited and space-time signal design" (IEEE Journal on Selected Areas in Communications, Vol. 22, No. 6, pp. 1099-1109, Aug. 2004), J.N. Laneman, D.N.C. Tse, G.W. Wornell suggests a paper entitled "Cooperative diversity in wireless networks: Efficient protocols and outage behavior" (IEEE Transactions on Information Theory, Vol. 50, No. 12, pp. 3062-3080, Dec. 2004), J. Boyer, DD Falconer, H. Yanikomeroglu suggests a variety of forms described in a paper entitled "Multihop diversity in wireless relaying channels" (IEEE Transactions on Communications, Vol. 52, No. 10, pp. 1820-1830, Oct. 2004). .

On the other hand, since the terminal B (212) is located in the outermost service range 20 of the base station, the reverse channel quality may be very poor. In this case, the reverse channel signal may be transmitted together with one or more other neighboring terminals within a service range in a synergistic manner. In FIG. 2, propagation to the base station 200 may be performed in the case of the terminal D 214 and the terminal E 215. The case where the number of terminals forming a cooperation because the distance is far is greater than three (terminals A, B, and C).

FIG. 3 is a flowchart illustrating an uplink data transmission method using a complementary transmission method and a reverse data transmission management method therefor in a terrestrial broadcasting system according to the present invention. Indicates an interaction between neighboring terminals that have accepted the. In more detail, in the terrestrial broadcasting system, a reverse data transmission method using a homogeneous transmission method and a reverse data transmission management method therefor include (1) a 'reverse data transmission management method for a mutual transmission method' performed at a base station; (2) 'reverse data transmission method' performed at the broadcast receiving terminal requesting for coherent transmission, and (3) 'reverse data transmission method performed at a neighboring broadcast receiving terminal responding to the coherent transmission request'. These will be described together.

It shows the operation of 'terminal' and the corresponding base station that support the reciprocal data transmission function. This will be described with reference to FIG. 2.

A base station 200 transmits to each other based on the 'channel condition' and the 'target data transmission rate' of the corresponding terminal (terminal within a range of service provided by the base station) (the terminal D 214 is assumed). If it is determined that the method is appropriate, the corresponding terminal D (214) is notified. Here, as described above, the conventional transmission diversity scheme, the conventional MIMO technique, and the conventional beamforming technique may be applied to the grayscale transmission scheme, or may be adaptively determined according to the reverse channel state of the terminal. It may be. That is, the base station 200 in determining the premature transmission scheme, according to the reverse channel state of the corresponding terminals (terminals within the range of the service provided by the base station) transmit diversity scheme, preliminary MIMO scheme, or Any of the shaping beamforming techniques may be adaptively determined.

Then, the terminal D 214 broadcasts a signal (a correlation request signal) for searching for a neighbor terminal to form a correlation, and observes the response. At this time, neighboring terminals (eg, terminal E, etc.) that have received the broadcasted correlation request signal have a 'receive power of the search signal' and 'the terminal's own system status (if there is other data to be transmitted, etc.). It is determined whether or not a mutual relationship can be formed in consideration of the ') and informs the decision result (300).

The terminal D 214 searches for a terminal (for example, terminal E) that has responded to form a mutual relationship with the terminal D among the neighboring terminals (301), and then provides information about the found neighboring terminals (terminal E). Notify the base station 200 (302). That is, the terminal D 214 informs the base station that it and the neighboring terminals (terminal E) searched will form a mutual relationship (302).

Then, the base station 200 transmits a frequency resource to the terminals (terminal D and the terminal E) in the correlation so that the terminals in mutual relation can transmit the reverse channel signal (reverse data) by applying the mutual transmission scheme. (303).

When the corresponding terminal D having the reverse data signal to be transmitted through the homogeneous scheme is transmitted to other terminals (terminal E) having a mutual relation (304), all terminals having a mutual relation (terminal E) ) Simultaneously transmits the 'signal generated by the coherent transmission scheme' (the signal generated by applying the coherent transmission scheme to the reverse data signal received from the terminal D) through the frequency resource allocated in step 303. (305).

Then, the base station 200 receives this premature signal, thereby improving reception performance. Here, the base station 200 combines the reverse data signal received from the terminal D and the reverse data signal received from the terminals having a mutual relationship, thereby finally obtaining the reverse data received signal having the best performance.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, in the terrestrial broadcasting system by performing a reverse data transmission through a mutual transmission method based on mutual cooperation between two or more terminals, the reverse channel transmission performance, channel capacity, And there is an effect that can improve the service range and the like.

Claims (13)

In the reverse data transmission management method in the base station of the broadcast system, A transmission method determination step of notifying a broadcast reception terminal of the broadcast reception terminals within the service range of the base station to determine reverse transmission data by applying the determined correlation transmission method; Neighboring terminal information receiving step of receiving information on the neighboring terminal to form a mutual relationship from the broadcast receiving terminal; A frequency allocating step of allocating frequency resources to be used for the mutual transmission scheme to neighboring terminals having a mutual relation; And A reverse data receiving step of receiving reverse data from the broadcast receiving terminal and a neighboring terminal having the mutual relationship and restoring optimal reverse data Reverse data transmission management method for a transmission type transmission method in a base station comprising a. The method of claim 1, The determining of the transmission method, It is determined whether to apply a premature transmission method on the basis of the channel status and the target data transmission rate of the broadcast receiving terminal within the range of the service provided by the base station. How to manage. The method according to claim 1 or 2, The mutual aid transmission method, In the base station, characterized in that the transmission diversity scheme of any one of a complementary space-time coding (STC) method, a space-Frequency Coding (SFC) method, a space-time-Frequency Coding (STFC) method A method for managing reverse data transmission for the aided transmission method. The method according to claim 1 or 2, The mutual aid transmission method, A reverse data transmission management method for a coherent transmission method in a base station, characterized in that it is a beamforming method. The method according to claim 1 or 2, The mutual aid transmission method, A reverse data transmission management method for a multi-transmission method in a base station, characterized in that it is a multiplex multiple input multiple output (MIMO) technique. The method according to claim 1 or 2, The mutual aid transmission method, According to the reverse channel state of the broadcast receiving terminals within the service range of the base station, any one of a transmit diversity scheme, a preliminary MIMO technique, and a preliminary beamforming technique is adaptively determined. A method of managing reverse data transmission for a format transmission method. In the reverse data transmission method in the broadcast receiving terminal requesting the mutual transmission, A transmission method notification step of receiving notification from the base station to transmit reverse data by applying a mutual transmission method; A neighbor terminal search step of broadcasting a correlation request signal to search for a neighbor terminal to form a correlation; A neighboring terminal reporting step of transmitting information on a neighboring terminal in response to the correlation request signal to the base station; A frequency allocating step of allocating a frequency resource for use in a mutual aid transmission scheme from the base station; A reverse transmission step of transmitting reverse data to the base station and a neighboring terminal in response to a correlation request using the allocated frequency resource Reverse data transmission method comprising a. In the reverse data transmission method in a neighboring broadcast receiving terminal in response to a premature transmission request, A response step of receiving an acknowledgment request signal broadcasted by the broadcast receiving terminal requesting an intermodal transmission and accepting an acknowledgment; A frequency allocation step of allocating a frequency resource to be used for a mutual aid transmission scheme from a base station; And Receiving reverse data from the broadcast receiving terminal requesting the premature transmission, and a data transfer step of transmitting the reverse data to the base station using the allocated frequency resources Reverse data transmission method comprising a. The method of claim 8, The response step, And determining whether to accept an acknowledgment of the correlation based on the reception power of the correlation request signal and the system situation of the terminal. The method according to any one of claims 7 to 9, The mutual aid transmission method, Reverse data transmission, characterized in that the transmission diversity scheme of any one of a complementary space-time coding (STC) method, a space-Frequency Coding (SFC) method, a space-time-Frequency Coding (STFC) method Way. The method according to any one of claims 7 to 9, The mutual aid transmission method, A reverse data transmission method, characterized in that it is a beamforming method. The method according to any one of claims 7 to 9, The mutual aid transmission method, A reverse data transmission method characterized by a Multiple Input Multiple Output (MIMO) technique. The method according to any one of claims 7 to 9, The mutual aid transmission method, It is determined by the base station, and any one of a transmit diversity scheme, a preliminary MIMO technique, and a preliminary beamforming technique is adaptively determined according to a reverse channel state of broadcast receiving terminals within a service range of the base station. Reverse data transmission method.

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