KR101527033B1 - How to Receive Transparent Repeater Identification Information - Google Patents

Abstract

A method for receiving transponder repeater identification information is disclosed. The terminal may receive preamble offset information of a transparent relay operating in a transparent mode through a broadcast channel or a control channel from the base station. Thereafter, the terminal may adjust the timing of the preamble symbol of the transponder repeater using the offset information, and receive the transponder repeater preamble including the identifier of the transponder repeater from the transponder repeater. Then, the terminal can identify the transponder repeater by using the identifier of the transponder repeater.

Transparent Repeater, Preamble, IEEE 802.16m

Description

[0001] The present invention relates to a method for receiving transparent relay repeater identification information,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to a method for a terminal to receive transparent repeater identification information in a wireless communication system.

A relay station is widely used as a technique introduced to solve a shadow area in a mobile communication system. In the past, the repeater method was limited to the function of a repeater that simply amplifies and sends signals, but in recent years it has evolved into a more intelligent form.

The repeater can expand the service coverage area by expanding the cell of the base station, and further improve the transmission speed of the terminal (improve data throughput). Furthermore, the repeater technology has the advantage of reducing the cost of the expansion of the base station and the maintenance cost of the backhaul network in the next generation mobile communication system. A frame structure used by such a repeater will be described.

1 is a diagram showing a frame structure used in a broadband wireless access system (for example, IEEE 802.16).

Referring to FIG. 1, the horizontal axis of a frame represents an Orthogonal Frequency Division Multiplexing Access (OFDMA) symbol as a unit of time, and the vertical axis of the frame represents a logical number of a subchannel as a frequency unit. In FIG. 1, one frame is divided into data sequence channels for a predetermined period of time by physical characteristics. That is, one frame is composed of one downlink subframe (DownLink Subframe) and one uplink subframe (UpLink Subframe).

At this time, the DL subframe includes a preamble, a frame control header (FCH), a DL-MAP, an UL-MAP, and one or more data bursts . Also, the uplink subframe may be composed of one or more uplink data bursts and ranging subchannels.

In FIG. 1, a preamble is used as a specific sequence data located in the first symbol of each frame to allow the terminal to synchronize with the base station or to estimate the channel. The FCH is used to provide channel allocation information and channel code information related to the DL-MAP. The DL-MAP / UL-MAP is a Medium Access Control (MAC) message used to inform the UE of channel resource allocation in the downlink / uplink. A data burst indicates a unit of data for transmission from a base station to a mobile station or from a mobile station to a base station.

A Downlink Channel Descriptor (DCD) that can be used in FIG. 1 represents a MAC message for informing a physical characteristic in a downlink channel, and an uplink channel descriptor (UCD) MAC message for informing the physical characteristics.

In the case of downlink, referring to FIG. 1, a mobile station detects a preamble transmitted from a base station and synchronizes with a base station. Thereafter, the downlink map can be decoded using the information obtained in the frame control header (FCH). The base station can transmit scheduling information for downlink or uplink resource allocation to the mobile station every frame (for example, 5 ms) using a downlink or uplink map (DL-MAP / UL-MAP) message.

A method for the terminal to recognize the base station has been described above, but a method for recognizing the repeater operating in the terminal transparent mode has not yet been proposed or defined.

SUMMARY OF THE INVENTION The present invention provides a method for a terminal to receive identification information of a transponder repeater.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method for receiving an identification information of a transponder repeater, the method comprising: receiving a preamble offset of a transponder relay operating in a transparent mode through a broadcast channel or a control channel Receiving information; Receiving, from the transponder repeater, a transparent repeater preamble including an identifier of the transponder repeater, and timing the preamble symbol of the transponder repeater using the offset information; And separating the transponder repeater using the identifier of the transponder repeater.

The method of receiving the identification information of the transponder repeater according to the present invention has various advantages.

First, the terminal receives the identification information from the transponder repeater and identifies the transponder repeater, thereby enabling efficient handover between the repeaters.

As the terminal receives the identification information from the transponder relay in the multi-hop relay environment, the relay to the terminal in the base station can be efficiently supported.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description set forth below in conjunction with the appended drawings is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details for a better understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, in the following description, certain terms are mainly described, but they need not be limited to these terms, and they may have the same meaning when they are referred to as arbitrary terms. Further, the same or similar elements throughout the present specification will be described using the same reference numerals.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

The techniques described below may be used in various communication systems, which may provide various communication services such as voice, packet data, and so on. The technology of the communication system can be used for a downlink or an uplink. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, an ABS, and the like. Also, a mobile station (MS) can be replaced with terms such as User Equipment (UE), Subscriber Station (SS), Mobile Subscriber Station (MSS), AMS or Mobile Terminal.

Also, the transmitting end refers to a node that transmits data or voice service, and the receiving end refers to a node that receives data or voice service. Therefore, in the uplink, the terminal may be the transmitting end and the base station may be the receiving end. Similarly, in the downlink, the terminal may be the receiving end and the base station may be the transmitting end.

The terminal of the present invention may be a PDA (Personal Digital Assistant), a cellular phone, a PCS (Personal Communication Service) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) Can be used.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the Institute of Electrical and Electronics Engineers (IEEE) 802 systems, 3GPP systems, 3GPP LTE systems and 3GPP2 systems. That is, the steps or portions of the embodiments of the present invention that are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document. In particular, embodiments of the present invention may be supported by documents such as P802.16-2004, P802.16e-2005 and P802.16Rev2, which are standard documents of the IEEE 802.16 system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention, and are not intended to limit the scope of the invention.

For example, in the embodiments of the present invention, the terms subordinate relay station and superordinate relay station are used. In this case, the lower relay and the higher relay are terms used relative to each other, and the base station is located at an upper node than the first repeater (odd hop relay) and the first relay is located at an upper node than the second relay (even hop relay) Lt; th > repeater.

A frame is a data sequence for a fixed time that is used by a physical specification. An Orthogonal Frequency Division Multiple Access (OFDMA) frame includes an uplink frame and a downlink frame. In the IEEE 802.16m system, a 20-msec superframe can be included in four frames each having a length of 5 ms. And, frames of 5 msec length may include 8 subframes.

2 is a diagram showing an example of a frame structure that can be used in embodiments of the present invention.

Referring to FIG. 2, one superframe includes one or more frames (e.g., F0, F1, ..., F3), and one frame includes one or more subframes , SF0, SF1, ..., SF7. Also, one subframe may include one or more OFDMA symbols. The length and number of superframes, subframes, and symbols may be adjusted by user requirements, system environment, and the like. In the embodiments of the present invention, the term " subframe " is used. Here, 'subframe' means all the lower frame structures generated by dividing one frame into a predetermined length.

The subframe structure used in the embodiments of the present invention can be configured by dividing a commonly used frame into one or more subframes. At this time, the number of subframes included in one frame can be determined by the number of symbols constituting the subframe. For example, it is assumed that one frame is composed of 48 symbols. If one subframe is composed of six symbols, one frame may be composed of eight subframes. Also, if one subframe is composed of 12 symbols, one frame may be composed of 4 subframes.

As shown in Fig. 2, it is assumed that the length of one super frame is 20 msec and the length of the frame is 5 msec. That is, one superframe may be composed of four frames. In addition, one frame has a frame structure composed of 8 subframes. At this time, one subframe may be configured as six OFDMA symbols. Each superframe may include a super frame header (SFH). The super frame header (SFH) may be referred to as superframe based control signaling.

3 is a diagram illustrating an example of a transmission position of a synchronization channel used in embodiments of the present invention.

Referring to FIG. 3, one Synchronization CHannel (SCH) may be composed of one or more OFDM symbols. In this case, in the embodiments of the present invention, the synchronization channel may be transmitted with a transmission period (for example, 5 msec). In the embodiments of the present invention, the number of OFDM symbols constituting the synchronization channel and the transmission period of the synchronization channel can be changed according to the requirements of the user or the channel environment.

The frame structure to be described below shows a case in which time division duplex (TDD) is supported in one frame of 5 msec period. However, it can be applied to a frequency division duplex (FDD) and can be interpreted as a TDD / FDD mode operation for a plurality of frames. In addition, the division of each area can be set for each subframe for a frame composed of one or more subframes or for each frame for one or more frames.

4 is a diagram illustrating an example of a frame structure composed of a unidirectional zone supporting a multi-hop relay in an IEEE 802.16m system.

Referring to FIG. 4, a relay station (RS) can be divided into an odd hop relay and an even hop relay according to the number of hops with a base station. The downlink of the odd hop relay may include a 16m DL transmission zone and a 16m DL reception zone, and the uplink of the odd hop relay may include a 16m uplink reception zone 16m UL Receive Zone) and a 16m UL Transmit Zone.

First, a frame structure of a base station will be described. A 16m downlink transmission zone (16m DL transmission zone) is a downlink interval of a base station, and the base station can provide downlink transmission to a 16m repeater or a 16m terminal. A 16m UL Receive Zone is an uplink interval of a base station, and a 16m terminal or a 16m repeater provides uplink transmission to a base station.

Here, the repeater located at an upper node than the node where the current repeater is located, and having an odd hop or an even hop from the base station can be referred to as an upper odd hop relay and a higher even hop relay. On the contrary, the repeater located at the lower node than the node where the repeater is located and the odd hop or the even hop away from the base station can be referred to as a lower odd hop relay and a lower even hop relay.

Next, the repeater frame structure of the odd hop will be described. A 16m DL transmission zone of an odd hop relay is a section for providing downlink transmission to a 16m terminal or a lower even-hop repeater as a downlink section of a repeater. In the 16m DL Receive Zone, a BS or a higher-order even-hop repeater provides downlink transmission to an odd-hop repeater. A 16m UL transmission zone is a period for providing uplink transmission to a base station or an upper even-hop repeater in an uplink interval of a repeater. In the 16m UL Receive Zone, a 16m terminal or a lower even-hop repeater provides an uplink transmission to an odd-hop repeater.

FIG. 5 is a diagram illustrating an example of a frame structure composed of a bi-directional zone supporting a multi-hop relay in the IEEE 802.16m system.

Referring to FIG. 5, in the frame structure of the odd-hop repeater, the odd-hop repeater receives signals from the base station, the upper even-number hop relay, and the lower even-hop repeater through the bi- directional receive zone in the downlink interval .

In addition, the odd-hop repeater can transmit signals to the base station, the upper even-hop repeater, and the lower even-hop repeater through the bi-directional transmission zone in the uplink interval. The 16m downlink access zone (16m DL Access Zone) is a period in which a 16m base station or a 16m repeater transmits a signal to a 16m terminal. A 16m UL link zone (16m UL Access Zone) is a period in which a 16m base station or a 16m repeater receives a signal from a 16m terminal.

6 is a diagram illustrating an example of a frame structure supporting a multi-hop relay in the IEEE 802.16m system.

Referring to FIG. 6, it can be seen that the bidirectional zone is a combined frame structure based on the frame structure of the unidirectional zone shown in FIG. In an odd hop repeater frame structure, an odd hop repeater can transmit a signal to a 16m terminal or a lower even hop relay through a 16m DL transmission zone in a downlink interval. In the odd-hop repeater, a 16m DL Receive Zone is a period during which a signal is received from a Node B or a higher-order even-hop repeater in a downlink interval.

The odd-hop repeater can bidirectionally transmit the signal to the base station or the lower even-hop repeater through the 16m network coding receive zone in the downlink interval.

7 is a diagram showing a frame structure for a transparent relay (Transparent RS).

Referring to FIG. 7, the transparent repeater can receive a signal from the base station or the upper even-hop repeater through the 16m downlink reception zone in the downlink interval. Also, the transparent repeater can transmit a signal to the base station or the upper even-hop repeater through the 16m uplink transmission zone in the uplink interval.

The repeater can be divided into two operation modes according to whether a preamble and a broadcast channel are transmitted or not. That is, a transparent mode and a non-transparent mode. The repeater operating in the non-transparent mode can transmit a preamble, control information (Super Frame Header, BCH), resource allocation information (A-MAP or USCCH: Unicast Service Control CHannel) at the beginning of the super frame. Alternatively, the transparent RS operating in the transparent mode may not transmit the preamble, control information, resource allocation information, and the like.

In a wireless communication system in which a channel environment between a base station and a terminal continuously changes, signaling between the base station and the terminals must be synchronized for successful data transmission and reception. At this time, the base station can insert a preamble for synchronization in a part of the transmitted frame so that the terminals can synchronize with each other. In this manner, the UEs can synchronize the downlink channel through the preamble. In addition, the base station may use a separate synchronization channel.

In a wireless communication system using a repeater, a terminal can receive preamble, control information, and resource allocation information from a base station to receive and demodulate data, and receive data transmitted by a repeater based on the information. At this time, the terminal can recognize the transponder repeater and demodulate and receive the data. Hereinafter, a method for the terminal to recognize the transponder repeater to demodulate and receive data will be described.

8 is a diagram illustrating a frame structure of a base transceiver station and a transparent relay for a terminal to recognize a transponder repeater in the IEEE 802.16m system.

Referring to FIG. 8A, a main synchronization signal may be transmitted through a primary preamble (PA-Preamble) located in a front portion of a first frame in a super frame of a base station. A sub-sync signal can be transmitted from the second frame through a secondary preamble (SA-Preamble) located on the front side of each frame.

Referring to FIG. 8B, the transponder repeater can transmit only a relay preamble (RA-Preamble) without transmitting a main preamble. At this time, the repeater cell ID information can be transmitted through the repeater preamble (RA-Preamble). A relay station identifier (Relay STID), a relay amble, or the like may be transmitted instead of the cell ID of the repeater.

A repeater preamble (RA-Preamble) can be fixedly transmitted from the first symbol of the 16m downlink transmission zone. It can also be transmitted in units of 5 msec (or frame unit). At least one repeater preamble may be transmitted in one super frame. At this time, the repeater preamble may use a specific signal for indicating a repeater cell ID, a relay amble, a repeater identifier, or a repeater as a reference signal.

The upper repeater (non-transferee repeater) of the base station or the transferee repeater can transmit the repeater preamble offset value to the transponder and the transponder, which are lower relays, through the broadcast channel or the specific control channel.

In this case, the RA preamble offset is set from the time of transmission of the sub-preamble of the base station or the upper repeater to the start of transmission of the preamble symbol of the transponder, from the first symbol transmission time of the superframe to the transponder repeater To the start of transmission of the preamble symbol. In addition, the repeater preamble offset can be expressed in various ways from the first symbol transmission time of the frame to the transmission start time of the preamble symbol of the transparent relay. That is, the offset is not limited to a specific time point as a reference.

The transponder repeater can transmit the repeater preamble when the transponder repeater tries to enter the initial network or when the operation mode of the repeater changes from the non-transferee repeater mode to the transferee repeater mode. The UE can receive the repeater preamble offset information from the upper repeater of the base transceiver station or the transferee repeater to determine the reception time of the transferee repeater preamble. Accordingly, the terminal can recognize the transponder repeater using the repeater preamble offset (RA-P offset) information and the repeater cell ID included in the transparent repeater preamble.

The above-described repeater preamble symbol offset information can be represented by 6 bits. This offset relates to assigning a start time in a given field in a broadcast channel or control channel.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) Field Programmable Gate Arrays), a processor, a controller, a microcontroller, a microprocessor, or the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

1 is a diagram showing a frame structure used in a broadband wireless access system (for example, IEEE 802.16)

2 is a diagram showing an example of a frame structure that can be used in embodiments of the present invention;

3 is a diagram showing an example of a transmission position of a synchronization channel used in embodiments of the present invention;

FIG. 4 illustrates an example of a frame structure composed of a unidirectional zone supporting a multi-hop relay in an IEEE 802.16m system; FIG.

FIG. 5 illustrates an example of a frame structure composed of a bi-directional zone supporting a multi-hop relay in the IEEE 802.16m system,

6 is a diagram illustrating an example of a frame structure supporting a multi-hop relay in an IEEE 802.16m system,

7 is a diagram showing a frame structure for a transparent relay (Transparent RS)

8 is a diagram illustrating a frame structure of a base transceiver station and a transparent relay for a terminal to recognize a transponder repeater in the IEEE 802.16m system.

Claims (5)

Receiving a preamble offset information of a transponder relay operating in a transparent mode through a broadcast channel or a control channel from a base station; Receiving, from the transponder repeater, a transparent repeater preamble including an identifier of the transponder repeater, and timing the preamble symbol of the transponder repeater using the offset information; And Wherein the terminal identifies the transponder repeater using an identifier of the transponder repeater, Wherein the preamble offset is information indicating a transmission time point of the preamble symbol of the transponder repeater. The method according to claim 1, Wherein the transponder repeater preamble is transmitted from a first symbol of a downlink transmission zone of a transponder repeater. The method according to claim 1, Wherein the transponder repeater preamble is transmitted in units of frames of the transponder repeater. The method according to claim 1, Wherein the preamble offset represents a time from transmission of a secondary preamble (SA-P) symbol of the base station to transmission of a preamble symbol of the transparent relay. The method according to claim 1, Wherein the preamble offset indicates a time from a transmission of a first symbol of a superframe or a frame of the transparent relay to a transmission of a preamble symbol of the transparent relay.

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