KR20080078194A - Method for operating multiplexing between heterogeneous network - Google Patents

Abstract

A method for performing a multiplexing operation between heterogeneous networks is provided to prevent a signaling overhead from increasing when a time division or a frequency division multiplexing scheme is applied between an existing system and a newly evolved system. A method for performing a multiplexing operation between heterogeneous networks comprises the following several steps. An MS(Mobile Station) receives a preamble and checks a frame start time, i.e. allocation start time of a downlink subframe. The MS obtains No. OFDMA(Orthogonal Frequency Division Multiple Access) symbol information, which is resource allocation section information for the first system in the downlink subframe, and overall frame duration by decoding a DL-MAP message(404). The MS obtains No. OFDMA symbol information, which is resource allocation section information for the first system in an uplink subframe, and allocation start time of the uplink subframe by decoding a UL-MAP message(406). The MS transmits or receives signals to or from a base station by using the obtianed information(408).

Description

How to operate multiplexing between heterogeneous networks {METHOD FOR OPERATING MULTIPLEXING BETWEEN HETEROGENEOUS NETWORK}

1 illustrates a frame structure used in an IEEE 802.16 communication system.

2 is a diagram illustrating a frame structure newly proposed in an embodiment of the present invention.

3 is a diagram illustrating a frame structure for supporting multiplexing mode operation according to an embodiment of the present invention.

4 is a flowchart illustrating a signal transmission / reception process of a mobile station in multiplex mode operation according to an embodiment of the present invention.

The present invention relates to a wireless communication system, and more particularly, to a method for supporting a multiplex operation operation between heterogeneous networks.

Currently, mobile communication systems are being developed to provide various services such as broadcasting, multimedia video, and multimedia messages. In particular, the fourth generation mobile communication system is being developed to provide a data transmission speed of 100Mbps or more for high-speed mobile users and data services of 1Gbps or more for low-speed mobile users, mainly for voice and packet data communication.

A portable internet system is a system close to the fourth generation mobile communication system. The portable Internet system, also called Wibro (Wireless Broadband) communication system or mobile WiMAX (mobile WiMAX), is compatible with a communication system based on Institute of Electrical and Electronics Engineers (IEEE) 802.16.

1 is a diagram illustrating a frame structure used in the IEEE 802.16 communication system.

Referring to FIG. 1, the frame is a time division duplex (TDD) orthogonal frequency division multiple access (OFDMA) frame, and is divided into a downlink subframe and an uplink subframe. Each of the downlink subframe and the uplink subframe includes a plurality of subchannel zones according to a subchannel configuration method. The information about the sub channel zones is included in a frame control header (FCH) and MAP messages included in the first zone.

Meanwhile, the mobile WiMAX communication system is in the commercialization stage, and a Wibro Evolution communication system that has developed the mobile WiMAX communication system is currently being studied. The WiBro evolution communication system aims at performances such as mobility support up to 300km per hour, variable bandwidth support, and overhead minimization.

The WiBro evolution communication system seeks to introduce advanced technologies that were not used in the mobile WiMAX communication system. The advanced technologies include multi-antenna technology, IPv6 technology, multicast / broadcast service technology, and the like.

Assuming that the WiBro evolution communication system is implemented, it is obvious that the mobile WiMAX communication system and the WiBro evolution communication system should be interworked with each other. However, the mobile WiMAX communication system and the WiBro evolution communication system may have different subchannel structures or different control signal systems. Therefore, in order for the mobile WiMAX communication system and the WiBro evolution communication system to be interworked, a specific solution for this must be defined.

In addition, the mobile WiMAX communication system and the WiBro evolution communication system may operate a time division multiplexing (TDM) method or a frequency division multiplexing (FDM) method. In this case, it is advantageous for the WiBro evolution communication system to use the control information used in the multiplexing operation in the mobile WiMAX communication system as it is, to prevent additional overhead. The control information must be transmitted robustly so that all mobile stations in the system can decode it. Thus, repetitive transmission of the control information increases signaling overhead.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a method for supporting a multiplex operation operation between heterogeneous networks.

The first method of the present invention for achieving the above object; In a wireless communication system, in a multiplexing mode operating method of a base station, there is a first system and a second system, and the second system is an evolved system from the first system and a control signal and broadcast used in the first system. Transmitting a first message including a signal and using information indicating total frame length information and information indicating the number of symbols allocated for the first system in the downlink subframe, and a position at which the uplink subframe starts. And transmitting a second message including information indicating and information indicating the number of symbols allocated for the first system in the uplink subframe.

The second method of the present invention for achieving the above object; In a wireless communication system, in a multiplexing mode operating method of a mobile station, a first system and a second system exist, and the second system is an evolved system from the first system and a control signal and broadcast used in the first system. Receiving a first message from a base station, the first message including full frame length information and information indicating the number of symbols allocated for the first system in a downlink subframe; And receiving a second message including information indicating a position at which an uplink subframe starts and information indicating a number of symbols allocated for the first system in the uplink subframe.

The system of the present invention for achieving the above object; In a heterogeneous multiplex mode operating system, there is a first system and a second system, and the second system is an evolved system from the first system and can use control signals and broadcast signals used in the first system. And a first message including full frame length information and information indicating a number of symbols allocated for the first system in a downlink subframe, information indicating a position at which an uplink subframe starts, and the uplink subframe. Includes a base station transmitting a second message including information indicating the number of symbols allocated for the first system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation of the present invention will be described, and other background art will be omitted so as not to distract from the gist of the present invention.

The present invention provides a method capable of supporting a multiplexing method when operating a heterogeneous network. To this end, the present invention proposes a new frame structure, and a method of operating the multiplexing mode based on the proposed frame structure will be described.

In the present invention, which will be described below, a method of operating multiplexing mode will be described by taking time division multiplexing as an example, but the present invention provides a system using frequency division multiplexing and at least one system. The subframes of can be equally applied to a system using time division multiplexing.

2 is a diagram showing a frame structure newly proposed in an embodiment of the present invention.

Referring to FIG. 2, the frame may be divided into a downlink subframe and an uplink subframe, and each of the downlink subframe and the uplink subframe may be divided into regions for a first system and a second system. The first system may be a WiBro communication system, and the second system may be a WiBro evolution communication system or a multi-hop relay system evolved from the WiBro communication system. The mobile station corresponding to the second system can decode the control signal and the broadcast signal used in the first system.

Hereinafter, the second system will be described as a wibro evolution communication system.

The downlink subframe includes a region of a preamble 200 in which preambles are commonly used in the first system and a second system, and a frame control header (FCH) in which frame control information is transmitted. 210) region, DL-MAP region 220 in which DL-MAP message is transmitted, and UL-MAP region 230 in which UL-MAP message is transmitted.

The remaining downlink subframe regions other than the regions 200 to 230 may be further divided into resource regions for the first system and resource regions for the second system. This is the same for the uplink subframe.

The second system resource region in the downlink subframe and the second system resource region in the uplink subframe may be indicated by the STC_DL_Zone_Switch_IE message and the UL_Zone_Switch_IE message, respectively. The messages may be implemented by changing or newly adding some contents of the message used in the IEEE 802.16 standard.

3 is a diagram illustrating a frame structure for supporting multiplexing mode operation according to an embodiment of the present invention.

Referring to FIG. 3, a first mobile station using the first system may be allocated only resources corresponding to the first system. Thus, the first mobile station should be able to know the location and size of the resources allocated to it in the entire frame.

To this end, the present invention provides a method for the first mobile station to know the location and size of resources allocated for itself in each of the downlink subframe and the uplink subframe.

That is, the first mobile station in accordance with the present invention uses the frame length information to determine the total frame length, which is used for downlink. The size of the downlink resource allocated for the first system in the downlink subframe through OFDMA symbols is allocated to the first system in the uplink subframe through the allocation start time. Start position of No. used for uplink. Through the OFDMA symbols, it is possible to know the size of the uplink resource allocated for the first system in the uplink subframe. For example, the length of one frame may be represented by time as shown in Table 1 below, and the allocation start time may also be expressed in time units.

No. for the frame duration and downlink. The OFDMA symbols information may be included in the DL-MAP message, and No. for the Allocation Start Time and uplink. OFDMA symbols information may be included in the UL-MAP message.

4 is a flowchart illustrating a signal transmission and reception process of a mobile station in multiplex mode operation according to an embodiment of the present invention.

Referring to FIG. 4, first, in step 402, the mobile station receives a preamble to determine a frame start position, that is, a start position of a downlink subframe, and proceeds to step 404. In step 404, the mobile station transmits No. which is resource allocation region information for the first system in a total frame duration and a downlink subframe by decoding the DL-MAP message. The OFDMA symbol information is obtained and the process proceeds to step 406.

In step 406, the mobile station determines the location of the resource allocation region information for the first system in the uplink subframe and the allocation start time of the uplink subframe by decoding the UL-MAP message. The OFDMA symbol information is obtained and the process proceeds to step 408. Herein, the allocation start time means a time in which the time corresponding to the entire downlink subframe and the TTG (Tx-Rx Transition Gap) time are added together.

In step 408, the mobile station transmits and receives a signal with a base station using the obtained information.

A second system resource allocation region, that is, a null region, in which the mobile station does not need to decode in the downlink subframe is a No included in the DL-MAP message in the total number of symbols of the downlink subframe. . Corresponds to the subtracted number of OFDMA symbols. This may be expressed as Equation 1 below.

That is, the mobile station is a No. included in the DL-MAP message. Not only the resource allocation region of the first system can be recognized by the OFDMA symbol information, but also the resource allocation region of the second system can be recognized using the allocation start time information.

In addition, a null area in which the mobile station does not need to transmit a signal in the uplink subframe includes a No. Corresponds to the subtracted number of OFDMA symbols. This may be represented as in Equation 2 below.

That is, the mobile station is a No. included in the UL-MAP message. Not only the resource allocation position and amount of the uplink subframe can be known using the OFDMA symbol information and the allocation start time information, but also the resource allocation region of the second system can be recognized using Equation 2.

The frame duration may be represented by a code value and may be represented as in Table 1 below.

Code (N) Frame duration (ms) Frames per second 0 N / A AAS-only gap up to 200 ms One 2 500 2 2.5 400 3 4 250 4 5 200 5 8 125 6 10 100 7 12.5 80 8 20 50 9-255 reserved

Meanwhile, in the frequency division scheme, the frame period may be indicated according to the position of the periodic preamble, and the entire frame interval may be indicated according to the frame duration code value included in the DL-MAP message. In the downlink period, the mobile station determines the start position of the downlink subframe through the preamble, The resource allocation region is recognized by the OFDMA symbol. In the uplink period, the mobile station determines the start position through an allocation start time. The resource allocation region is recognized by the OFDMA symbol.

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 defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention has an advantage of supporting multiplexing between heterogeneous networks without increasing signaling overhead when the time division or frequency division scheme is applied between the existing system and the newly evolved system.

Claims (16)

In a wireless communication system, in a multiplexing mode operating method of a base station, There is a first system and a second system, the second system is a system evolved from the first system can use the control signal and the broadcast signal used in the first system, Transmitting a first message including full frame length information and information indicating the number of symbols allocated for the first system in a downlink subframe; Transmitting a second message including information indicating a position where an uplink subframe starts and information indicating a number of symbols allocated for the first system in the uplink subframe. . The method of claim 1, The first system is a Wibro communication system or a Mobile WiMAX (Mobil WiMAX) communication system, the second system is a Wibro Evolution communication system, characterized in that the multiplex mode operation method of the base station. The method of claim 1, Each of an uplink subframe and a downlink subframe of the frame is divided into a resource allocation region for the first system and a resource allocation region for the second system in time. The method of claim 1, Each of an uplink subframe and a downlink subframe of the frame is divided into a resource allocation region for the first system and a resource allocation region for the second system by frequency. The method of claim 1, The first message is a DL-MAP message, and the second message is a multiplex mode operating method of a base station. In a wireless communication system, in a multiplexing mode operating method of a mobile station, There is a first system and a second system, the second system is a system evolved from the first system can use the control signal and the broadcast signal used in the first system, Receiving, by a mobile station using the first system, a first message including full frame length information and information indicating a number of symbols allocated for the first system in a downlink subframe from a base station; Receiving a second message including information indicating a position at which an uplink subframe starts and information indicating a number of symbols allocated for the first system in the uplink subframe; . The method of claim 6, The first system is a Wibro communication system or a Mobile WiMAX communication system, and the second system is a Wibro Evolution communication system, characterized in that the mobile station multiplexing mode operating method. The method of claim 6, Each of an uplink subframe and a downlink subframe of the frame is divided into a resource allocation region for the first system and a resource allocation region for the second system in time. The method of claim 6, Each of an uplink subframe and a downlink subframe of the frame is divided into a resource allocation region for the first system and a resource allocation region for the second system by frequency. The method of claim 6, And wherein the first message is a DL-MAP message and the second message is a UL-MAP message. In a heterogeneous multiplex mode operating system, There is a first system and a second system, the second system is a system evolved from the first system can use the control signal and the broadcast signal used in the first system, A first message including total frame length information and information indicating a number of symbols allocated for the first system in a downlink subframe, information indicating a position at which an uplink subframe starts, and information in the uplink subframe And a base station transmitting a second message including information indicating the number of symbols allocated for the first system. The method of claim 11, A first message using the first system and including information indicating total frame length information from the base station and information indicating the number of symbols allocated for the first system in a downlink subframe, and a position at which an uplink subframe starts; And a mobile station for receiving a second message including information indicating the information and information indicating the number of symbols allocated for the first system in the uplink subframe. The method of claim 11, The first system is a Wibro communication system or a Mobile WiMAX communication system, and the second system is a heterogeneous inter-network multiplexing mode operating system, characterized in that the Wibro Evolution communication system. The method of claim 11, Each of the uplink subframe and the downlink subframe of the frame is characterized in that the resource allocation region for the first system and the resource allocation region for the second system are separated in time. The method of claim 11, In each of the uplink subframe and the downlink subframe of the frame, the resource allocation region for the first system and the resource allocation region for the second system are divided into frequencies. The method of claim 11, The first message is a DL-MAP message, the second message is a heterogeneous network multiplexing mode operating system, characterized in that the UL-MAP message.

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