KR101030376B1 - System and Method for Transmitting/Receiving a Downlink MAP message in a Broadband Wireless Access System - Google Patents

Abstract

In the broadband wireless access system, the at least one mobile terminal includes information on a two-dimensional burst interval, mode information on an auxiliary burst information entity (IE), and information on auxiliary bursts. And transmitting a downlink map (MAP) message including an auxiliary burst IE, wherein mode information on the auxiliary burst IE indicates a mode used by the auxiliary burst IE.

Multiple Input Multiple Output (MIMO) System, Broadband Wireless Access System, Mobile Internet, H-ARQ MAP

Description

System and Method for Transmitting / Receiving a Downlink MAP Message in a Broadband Wireless Access System

1 is a view for explaining a method of allocating a MAP for supporting a conventional H-ARQ.

2 is a view for explaining a method of assigning MAP to which the present invention is applied.

3 is a diagram illustrating a relationship between an H-ARQ MIMO MAP and an entire MAP according to the present invention.

4 is a diagram illustrating a configuration of an H-ARQ MIMO MAP according to the present invention.

5 is a diagram illustrating an H-ARQ MIMO downlink map information object according to the present invention;

6 to 9 illustrate embodiments of a downlink auxiliary burst information entity operated according to a mode.

10A and 10B are diagrams illustrating dedicated DLMO IE control for MIMO.

11A and 11B illustrate H-ARQ MIMO uplink map entity information according to the present invention.

12 to 15 illustrate embodiments of an uplink auxiliary burst information entity operated according to a mode.

16 illustrates a dedicated MIMO uplink control information entity.

17 is a signal flowchart illustrating a method of constructing a map message according to an exemplary embodiment of the present invention.

The present invention relates to a system and method for transmitting / receiving downlink map (MAP) messages in a broadband wireless access communication system.

In general, wireless communication systems have been developed mainly for voice services, and are gradually developing to communication systems capable of not only voice but also data services and various multimedia services. However, the voice-oriented wireless communication system has a relatively small data transmission bandwidth and a high usage fee, thereby failing to meet a rapidly increasing demand for users. In addition, due to the development of the communication industry and increasing user demand for Internet services, there is an increasing need for a wireless communication system capable of efficiently providing Internet services. As a result, broadband wireless access systems have been introduced to efficiently provide Internet services with broadband enough to meet the increasing demands of users.                         

The broadband wireless access system is a system for integrating and supporting not only voice but also various low speed and high speed data services and multimedia application services such as high definition video. The broadband wireless access system can access PSTN and PSDN networks, Internet networks, IMT-2000 networks, ATM networks, etc. in a mobile or fixed environment based on wireless media using broadband such as 2 GHz, 5 GHz, 26 GHz and 60 GHz. It is a wireless communication system that can support more than a channel rate. The broadband wireless access system may be classified into a broadband wireless subscriber network, a broadband mobile access network, and a high-speed wireless LAN according to the mobility (fixed or mobile) and communication environment (indoor or outdoor) of a terminal, and a channel rate.

The wireless access method of the broadband wireless access system is being standardized by the IEEE 802.16 standardization group of the Institute of Electrical and Electronics Engineers, one of the international standardization organizations, and is currently providing wireless broadband Internet service to fixed terminals. The IEEE 802.16d standard is being promoted as a standard.

The IEEE 802.16d / e standard has a wider bandwidth of data than a conventional wireless technology for voice service, and can perform a lot of data transmission in a short time, and can efficiently use a channel by sharing all user channels. Do. In addition, quality of service (QoS) is guaranteed so that a user can receive different quality of services according to the characteristics of the service. In the IEEE 802.16d / e system, all users connected to the base station share and use a common channel, and the interval in which each user uses the channel is allocated by the base station in every up and down frame. The uplink and downlink access information must be informed so that the channel can be used separately.

In the IEEE 802.16d / e system, channel information is divided into uplink channel and downlink channel, information about each channel is defined as TLV (Type, Length, Value), Downlink Channel Descriptor (DCD), Uplink Channel Descriptor (UCD) message. It is included in the transmission to all the users at regular intervals to inform the terminal of the characteristic information on the channel.

The base station broadcasts uplink / downlink information for accessing the base station every frame so that the terminal can access uplink / downlink information. These are referred to as an uplink map and a downlink map, respectively, and are collectively referred to as a map message. The map message format as described above is illustrated in FIG. 1.

Referring to FIG. 1, in an 802.16d / e system, an H-ARQ MAP may be used to support a terminal capable of using a hybrid ARQ (H-ARQ).

The IEEE 802.16d / e system broadcasts up / down access information, and the mobile terminal receiving the broadcast message interprets the message and bursts of the mobile terminal through Compact UL / DL-MAP_IE information. Section is allocated, allowing access to the uplink and downlink of the base station.

However, referring to FIG. 1, the burst periods allocated to the terminal through the Compact UL / DL-MAP_IE information in the H-ARQ MAP are allocated in a sequential one-dimensional array. As shown in FIG. 1, in the order of burst 1, burst 2, and burst 3, the end point of the previous burst section becomes the start point of the next allocated burst section. Therefore, it is easy for the base station to allocate the burst period, and since the burst period allocation information is limited to the burst order and the burst length, the overhead for transmitting the allocation information is reduced. However, when considering a handover, a problem may occur in that data is lost due to channel collision with a neighbor base station, resulting in low transmission efficiency. That is, since the same burst section cannot be arbitrarily assigned to one mobile terminal, and the other burst section is assigned to one mobile terminal, two burst data cannot be combined at the time of handover. In order to solve this problem, a two-dimensional burst allocation method as shown in FIG. 2 has been proposed.

However, only a two-dimensional allocation method as shown in FIG. 2 has been proposed, and there is still no shortage of an efficient control message construction method between the base station and the terminal for supporting various operations of the MIMO.

The present invention proposes a system and method for transmitting / receiving downlink map messages in a broadband wireless access system.

In addition, the present invention proposes a system and method for transmitting / receiving an H-ARQ MIMO map message for supporting various MIMO operation modes.

The method proposed in the present invention; A method of constructing a map (MAP) message of a base station that selects a necessary section among burst sections in a broadband wireless access system and assigns it to burst data of a specific mobile terminal, the hybrid automatic being present inside a MAP message in the form of an extended information entity. Hybrid-Automatic Retransmission reQuest (H-ARQ) Support for Multiple Input Multiple Output (MIMO) The process of setting field values that indicate the operating modes included in a MAP Information Element (IE). And selectively generating a corresponding downlink or uplink auxiliary burst IE according to the set field value, and configuring a MAP message with the HARQ MIMO supported MAP IE and the generated downlink or uplink auxiliary burst IE. Process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings and tables. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention proposes a system and method for transmitting / receiving downlink map (MAP) messages in a broadband wireless access communication system. The present invention is applied to, for example, an Institute of Electrical and Electronics Engineers (IEEE) 802.16e Multiple Input Multiple Output (MIMO) system. In addition, the present invention proposes a new map message management method and burst allocation method for supporting the IEEE 802.16e MIMO system.

That is, in the following, an efficient MIMO map structure is designed and map messages are defined, respectively. 'H-ARQ MIMO DL / UL MAP IE' is created as the information object of the map message, and it supports various operation modes and defines 'Sub-Burst IE' for each operation mode.                     

3 is a conceptual diagram of an H-ARQ MIMO map message proposed in the present invention.

Referring to FIG. 3, the H-ARQ MIMO map message is a map message existing inside the conventional map message in the form of an extended information entity (Extended IE). The H-ARQ MIMO map message includes several H-ARQ MIMO map information objects (H-ARQ MIMO MAP IE). By using the H-ARQ map information object it can support a variety of operating modes as shown in Figure 4 between the terminal and the base station.

4 is a configuration diagram of an H-ARQ map message according to various operating modes according to an exemplary embodiment of the present invention.

Referring to FIG. 4, according to the field value indicating an operation mode included in the hybrid automatic retransmission multi-antenna support map information entity present in the map message in the form of the extended information entity of FIG. 3, the H- The ARQ map message includes a corresponding downlink or uplink auxiliary burst information entity.

Each message is classified into an uplink map message and a downlink map message. FIGS. 5 to 10 are downlink map messages, and FIGS. 11 to 16 are uplink map messages.

5 is a message including an H-ARQ MIMO downlink map information object.

Referring to FIG. 5, the H-ARQ MIMO downlink map information object includes a 4- or 6-bit extended DIUC field for specifying the purpose of the information object, a size field of the corresponding information object consisting of 4 or 8 bits, and a corresponding 2-bit bit. A field indicating a user ID in an information object, an 8-bit OFDMA symbol offset field, a 6-bit subchannel offset field, a 3-bit boosting field, and a 7-bit No. OFDMA Symbols field and 6-bit No. Subchannels, a 3-bit N sub burst field indicating the number of 1-dimensional allocation bursts in the 2-dimensional allocation interval, a Mode field indicating an operation mode, and an operation mode that can refer to an operation mode according to the value of the Mode field. It consists of the MIMO DL Sub-Burst IE field. The operating modes can be divided into four according to the combination of two bits of the Mode field. 6 to 9 illustrate an embodiment of a downlink auxiliary burst information entity operated by mode 2 bits.

Since the first bit of the mode field of FIG. 5 indicates the use of H-ARQ, a 4-bit ACID field indicating the H-ARQ channel ID when H-ARQ is used, and each packet transmitted through the same ARQ channel. A 1-bit AI_SN field is added indicating whether this has been successfully transmitted. The second bit of the Mode field indicates whether the secondary burst is represented by DIUC and Length values or the secondary burst by Nep and Nsch values. Therefore, if the second bit is '0', it has a 4-bit DIUC field and a 10-bit Length field, and if it is '1', it has a 4-bit Nep field and a 4-bit Nsch field. In the MIMO transmission scheme, when data is spatially divided (Spatial Multiplex), Nep or DIUC is transmitted by the number of spatially distinguishable streams (N_Layer).

However, whether the dedicated MIMO downlink control information object (Dedicated DL'Control IE for MIMO) field is included or not is determined by the dedicated MIMO DL Control Indicator value common to all the operation modes.                     

Dedicated DL Control IE for MIMO is illustrated in FIGS. 10A and 10B. 10A and 10B, a length field of 5 bits and a control header field of 3 bits that can indicate the type of control information are provided. If the first bit MIMO Control Info of the Control Header field is '1', this indicates an instruction for applying various technologies of MIMO. If the second bit CQI Control Info is '1', a feedback channel for applying MIMO technology Indicates an instruction for controlling (CQICH). The information commonly used in the above MIMO / CQI Control Info includes the following antenna grouping / selection 1-bit indication field, codebook based precoding 1-bit indication field, and the 2-bit map. Through the antenna coupling MIMO technology or antenna selection MIMO technology or precoding code¶ technology or antenna coupling and precoding codebook MIMO combining technology or antenna selection and precoding codebook MIMO technology can be selected and applied. In addition, it consists of a two-bit field (N_layer) of data strings transmitted at the same time. When the MIMO Control Info field is '1', the transmit diversity technique (Matrix A) or the transmit diversity and spatial multiple combining technique (Matrix B) or the spatial multiple technique (MIMO basic technique selection (Matrix) 2 bit field) Matrix C) can be selected, and if the 2-bit map for the antenna coupling or selection and the codebook indication for precoding is '00', it operates without feedback for MIMO technology, and is defined as '01' and defined as Matrix A / B. Antenna coupled MIMO technology, '01' and Matrix C antenna selection MIMO technology, '10' to precoding MIMO technology, '11' and Matrix A / B plane antenna coupling and precoding combined MIMO technology, and '11 And may inform the UE that the Matrix C plane antenna selection and precoding are combined MIMO technology. The matrix A / B / C operation block (STC) output stream number (Mt) 2-bit field may define a MIMO technique that can be used in combination with the N_layer 2-bit field and the number of transmit antennas. When the antenna coupling or selection field is '1', 4 bits of antenna coupling or selection index are transmitted to the UE, and when the MIMO basic technologies are Matrix A and Matrix B, the antenna coupling index is selected and when the antenna C is Matrix C, the antenna selection index is represented. When the codebook field for precoding is '1', the codebook index 6 bits for precoding are transmitted to the terminal to transmit information on the technology and operation currently applied to the terminal.

In order to apply various advanced MIMO technologies, it is important to acquire radio channel environment information on a corresponding terminal in advance. When the CQI Control Info field is '1', a basic feedback transmission period (Period) 2 bit field, a frame offset 3 bit field, a time duration (Duration) 4-bit field, and a data string simultaneously transmitted It is composed of a 6-bit field of the feedback channel location (Allocation index) assigned to. The content of the feedback channel allocated here may be transmitted in one feedback channel in time through a downlink radio channel measurement value or a request value for a specific MIMO technology. Here, a specific MIMO technique is an antenna combining technique or an antenna combining technique or a selection bit of '1' and Matrix A / B. '1' indicates precoding technique.

In addition, an additional feedback channel can be allocated to support various advanced MIMO technologies, and is defined as a 2-bit field of the number of additional feedback channels (CQICH_Num). The basic characteristics (Period, Frame offset, Duration) of the added feedback channel are the same as the basic allocated feedback channel, and can be designated as a feedback type 3 bit field according to the MIMO technology to be applied. Channel location (Allocation index) 6-bit field for the physical allocation of the additional feedback channel, the feedback channel implementation consists of a 2-bit field.

As such, the configuration of control information for applying the MIMO technology can be applied to a general MIMO system.

Next, a downlink map message will be described with reference to FIGS. 11A to 16.

11A and 11B show H-ARQ MIMO uplink map entity information. 11A and 11B, since the field constituting the map entity information of the H-ARQ MIMO uplink is almost similar to the H-ARQ MIMO downlink map entity information shown in FIG. 5, the description of FIG. 5 is omitted. See. The 1-bit Allocation Start Indication field of the field of the H-ARQ MIMO uplink map entity information is a field for confirming whether a symbol offset and a subchannel offset of an uplink auxiliary burst are specified.

12 to 15 illustrate an operation mode of the MIMO UL Sub-Burst IE corresponding to FIGS. 6 to 9. In FIG. 11, Mode 00, Mode 01, It means Mode 10, Mode 11. In each information entity, a multi-user indicator field (MU Indicator) is a field indicating whether terminals having a single transmit antenna can use common resources at the same time. This is possible when the base station has multiple reception antennas and MIMO Spatial Multiplex decoding is possible. Do. When the MU Indicator field is '0', resources of the corresponding burst are allocated to one user, and when the MU Indicator field is '1', the resources of the corresponding burst may be allocated to as many users as N_layers. In addition, each user has an independent pilot transmission method.

FIG. 16 shows information for applying MIMO technology in uplink, and is composed of a 2-bit field of data string (N_layer) transmitted simultaneously with a 2-bit field of MIMO technology (Matrix) information.

FIG. 17 is a signal flowchart illustrating a method of constructing a map message of a base station for selecting and assigning necessary sections among burst sections in a broadband wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 17, the base station sets a field value indicating an operation mode included in the hybrid automatic retransmission multi-antenna support map information entity present in the map message in the form of an extended information entity in step 100. The base station generates a downlink or uplink secondary burst information entity according to the field value. First, in step 110, the base station examines the first bit value of the mode field value set in step 100. The first bit of the mode field value indicates whether H-ARQ is used. When the first bit value is set to '1', that is, when using the H-ARQ, the base station determines the H-ARQ channel in the downlink or uplink secondary burst information entity in step 120. A 4-bit ACID field indicating the ID and a 1-bit AI_SN field indicating whether each packet transmitted on the same ARQ channel were transmitted successfully are added. Then, in step 130, the base station checks the second bit value of the mode field value. The second bit of the Mode field indicates whether the secondary burst is represented by DIUC and Length values or the secondary burst by Nep and Nsch values. Therefore, when the second bit is '0' as a result of the checking in step 130, the base station includes a 4-bit DIUC field and a 10-bit Length field in the downward or upward auxiliary burst information entity in step 140. However, if the second bit is '1' as a result of the check in step 130, the base station includes a 4-bit Nep field and a 4-bit Nsch field in the downlink or uplink burst information entity in step 150.

The present invention operating as described in detail above has an advantage of providing a system and method capable of efficiently providing various operation modes and various MIMO technologies between a terminal and a base station by operating a MIMO map message.

Claims (23)

In the broadband wireless access system, a method for constructing a map (MAP) message of a base station for selecting a required interval of the burst period and assigning it to burst data of a specific mobile terminal, Hybrid-Automatic Retransmission reQuest (H-ARQ) Multiple Input Multiple Output (MIMO) Supports MAP Information Object (IE) Setting a field value indicating an operation mode included in the), Selectively generating a downlink or uplink auxiliary burst IE corresponding to the set field value; And configuring a MAP message using the HARQ MIMO supported MAP IE and the generated downlink or uplink auxiliary burst IE. The method of claim 1, The operation mode field includes 2 bits, the first bit indicates whether the HARQ scheme is used, and the second bit represents an auxiliary burst with a downlink interval use code and a length value, and the number and bits of encoder input information. And indicating whether the secondary burst is represented with the number of subchannels. The method of claim 1, The downlink or uplink auxiliary burst IE comprises a dedicated MIMO support control indicator value indicating whether the dedicated MIMO supported downlink or uplink control IE field is included in all operating modes in common. . In the method of transmitting a downlink map (MAP) message in a broadband wireless access system, Downlink network MAP including at least one mobile terminal including the information on the two-dimensional burst interval, the mode information on the auxiliary burst information entity (IE), and the information on the auxiliary bursts IE Sending a message, The mode information on the auxiliary burst IE indicates a mode used by the auxiliary burst IE. The method of claim 4, wherein The mode information on the auxiliary burst IE includes information indicating whether to use a hybrid automatic retransmission request (H-ARQ) scheme. The method of claim 4, wherein The downlink MAP message transmission method includes a number of orthogonal frequency division multiple access (OFDMA) symbols and the number of sub-channels. The method of claim 4, wherein The downlink MAP message transmission method includes an orthogonal frequency division multiple access (OFDMA) symbol offset and a subchannel offset. The method of claim 4, wherein The downlink MAP message includes a dedicated multiple input multiple output (MIMO) downlink control IE, The dedicated MIMO downlink IE includes downlink MAP message transmission information comprising information indicating whether antenna coupling or selective MIMO technology is applied and information indicating whether a codebook is used for precoding. A method for receiving a downlink map (MAP) message in a broadband wireless access system, Receiving a downlink MAP message including the auxiliary burst IE including information on a two-dimensional burst section, mode information on an auxiliary burst information entity (IE), and information on auxiliary bursts; Include, The mode information on the secondary burst IE indicates a mode used by the secondary burst IE. 10. The method of claim 9, The mode information on the auxiliary burst IE includes information indicating whether to use a hybrid automatic retransmission request (H-ARQ) scheme. 10. The method of claim 9, The downlink MAP message receiving method includes a number of orthogonal frequency division multiple access (OFDMA) symbols and the number of sub-channels. 10. The method of claim 9, The downlink MAP message receiving method includes an Orthogonal Frequency Division Multiple Access (OFDMA) symbol offset and a subchannel offset. 10. The method of claim 9, The downlink MAP message includes a dedicated multiple input multiple output (MIMO) downlink control IE, The dedicated MIMO downlink IE includes downlink MAP message reception information comprising information indicating whether antenna coupling or selective MIMO technology is applied and information indicating whether a codebook is used for precoding. In a broadband wireless access system, A downlink map including at least one mobile terminal the auxiliary burst IE including information on a two-dimensional burst section, mode information on an auxiliary burst information entity (IE), and information on auxiliary bursts A base station transmitting a (MAP) message, Mode information on the auxiliary burst IE indicates a mode used by the auxiliary burst IE. The method of claim 14, The mode information on the auxiliary burst IE includes information indicating whether to use a hybrid automatic retransmission request (H-ARQ) scheme. The method of claim 14, The downlink MAP message includes a number of orthogonal frequency division multiple access (OFDMA) symbols and a number of subchannels. The method of claim 14, The downlink MAP message includes an Orthogonal Frequency Division Multiple Access (OFDMA) symbol offset and a subchannel offset. The method of claim 14, The downlink MAP message includes a dedicated multiple input multiple output (MIMO) downlink control IE, The dedicated MIMO downlink IE includes information indicating whether antenna coupling or selective MIMO technology is applied and information indicating whether to use a codebook for precoding. In a broadband wireless access system, Receive a downlink map (MAP) message including information on a two-dimensional burst interval, mode information on an auxiliary burst information entity (IE), and the auxiliary burst IE including information on auxiliary bursts. Including a mobile terminal, Mode information on the auxiliary burst IE indicates a mode used by the auxiliary burst IE. The method of claim 19, The mode information on the auxiliary burst IE includes information indicating whether to use a hybrid automatic retransmission request (H-ARQ) scheme. The method of claim 19, The downlink MAP message includes a number of orthogonal frequency division multiple access (OFDMA) symbols and a number of subchannels. The method of claim 19, The downlink MAP message includes an Orthogonal Frequency Division Multiple Access (OFDMA) symbol offset and a subchannel offset. The method of claim 19, The downlink MAP message includes a dedicated multiple input multiple output (MIMO) downlink control IE, The dedicated MIMO downlink IE includes information indicating whether antenna coupling or selective MIMO technology is applied and information indicating whether to use a codebook for precoding.

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