JP5356541B2 - Method and apparatus for transmitting uplink control signal in wireless communication system - Google Patents

Description

  The present invention relates to wireless communication, and more particularly to an uplink control signal transmission method and apparatus in a wireless communication system.

  The IEEE (Institute of Electrical and Electronics Engineers) 802.16e standard is an ITU-R (ITU-RadiocommunicationT) which is one sector of the 2007 ITU (International Telecommunication Union) (ITU-RadiocommunicationT). Was adopted under the name 'WMAN-OFDMA TDD'. ITU-R is preparing the IMT-Advanced system as the next-generation 4G mobile communication standard after IMT-2000. IEEE 802.16WG (Working Group) is a standard for the IMT-Advanced system at the end of 2006, and decided to promote the 802.16m project with the goal of creating an amendment standard of the existing IEEE 802.16e. As can be seen from the above goals, the 802.16m standard includes two aspects: the past continuity of modification of the 802.16e standard and the future continuity of the standard for the next generation IMT-Advanced system. . Accordingly, the 802.16m standard is required to maintain compatibility with Mobile WiMAX systems based on the 802.16e standard and to meet advanced requirements for IMT-Advanced systems.

  One of the systems considered in the next generation wireless communication system is orthogonal frequency division multiplexing (hereinafter referred to as OFDM) that can reduce the inter-symbol interference (ISI) effect with low complexity. System). In OFDM, data symbols input in series are converted into N parallel data symbols, and transmitted on N subcarriers that are separated from each other. The subcarriers should maintain orthogonality in the frequency dimension. Each orthogonal channel may experience frequency-selective fading that is independent of each other, and the interval between transmitted symbols may be increased and inter-symbol interference may be minimized. Orthogonal frequency division multiple access (hereinafter referred to as OFDMA) refers to a part of subcarriers that can be used independently in a system that uses OFDM as a modulation scheme to provide multiple connections. A multiple connection method to be realized. OFDMA provides a frequency resource called a subcarrier to each user, and each frequency resource is generally provided to a number of users independently and does not overlap each other. Eventually, frequency resources are allocated to each user in a mutually exclusive manner.

  In an OFDMA system, frequency diversity for multiple users can be obtained through frequency selective scheduling, and subcarriers can be allocated to various forms according to a permutation scheme for subcarriers. . In addition, the efficiency of the spatial domain can be enhanced by a spatial multiplexing technique using multiple antennas. In order to support such various techniques, it is necessary to transmit a control signal between the terminal and the base station. The control signal includes a CQI (Channel quality indicator) for the terminal to report the channel state to the base station, an ACK / NACK (Acknowledgement / Not-acknowledgement) signal in response to data transmission, and a bandwidth request signal for requesting radio resource allocation. , Precoding information in a multi-antenna system, antenna information, and the like. The control signal is transmitted via a control channel.

  To date, there has been no specific disclosure of a method for allocating an uplink control channel. Therefore, it is necessary to determine the fractional frequency reuse (FFR) region where the uplink control channel exists and the order of the uplink control channel and the uplink data channel.

  An object of the present invention is to provide an uplink control signal transmission method and apparatus in a wireless communication system.

  In one aspect, a method for transmitting an uplink control signal in a wireless communication system is provided. The uplink control signal transmission method includes receiving resource allocation information for each of a plurality of uplink control channels and transmitting an uplink control signal via any one of the plurality of uplink control channels. And sequentially adjacent resources based on one reference uplink control channel selected from the plurality of uplink control channels are assigned to each of the plurality of uplink control channels, and the resource allocation information is A radio resource allocated to each of the plurality of uplink control channels in a resource region in which a plurality of uplink control channels are configured is included. The resource allocation information further includes information on the position of a subframe in which the resource area is transmitted. The resource allocation information further includes information regarding a frequency partition to which the plurality of uplink control channels are allocated. The resource allocation information is broadcast. The plurality of uplink control channels include at least one of a bandwidth request channel (BRCH) and a feedback channel. The feedback channels include a fast feedback channel (FFBCH) and an HARQ (hybrid automatic repeat request) feedback channel (HFBCH; HARQ feedback channel). Radio resources for the feedback channel and radio resources for the BRCH are allocated sequentially. The size of the radio resource is the number of resource units to which the BRCH or the feedback channel included in the plurality of uplink control channels is allocated, or the number of the BRCH or the feedback channel. The BRCH resource unit includes 6 OFDM (Orthogonal Frequency Division Multiplexing) symbols in the time domain and 6 subcarriers in the frequency domain. The resource unit of the feedback channel includes 2 OFDM symbols in the time domain and 2 subcarriers in the frequency domain when the feedback channel includes HFBCH. The resource unit of the feedback channel includes 6 OFDM symbols in the time domain and 2 subcarriers in the frequency domain when the feedback channel includes FFBCH. The position of the reference uplink control channel in the resource region is pre-determined.

In another aspect, a terminal is provided in a wireless communication system. The terminal includes an RF (Radio Frequency) unit configured to transmit or receive a radio signal; and a processor coupled to the RF unit; the processor corresponding to each of a plurality of uplink control channels Receiving resource allocation information, and transmitting an uplink control signal through any one of the plurality of uplink control channels, and selecting one of the plurality of uplink control channels Resources sequentially adjacent to each other based on a reference uplink control channel are allocated to each of the plurality of uplink control channels, and the resource allocation information is configured in a resource region in which the plurality of uplink control channels are configured. Assigned to each of the plurality of uplink control channels This includes the size of the allocated radio resource. The resource allocation information further includes information on the position of a subframe in which the resource area is transmitted. The plurality of uplink control channels include at least one of a bandwidth request channel (BRCH) and a feedback channel.
This specification also provides the following items, for example.
(Item 1)
In an uplink control signal transmission method in a wireless communication system,
Receiving resource allocation information for each of a plurality of uplink control channels;
Transmitting an uplink control signal via any one of the plurality of uplink control channels,
Resources sequentially adjacent to each other based on one reference uplink control channel selected from among the plurality of uplink control channels are allocated to each of the plurality of uplink control channels,
The resource allocation information includes a radio resource size allocated to each of the plurality of uplink control channels in a resource region in which the plurality of uplink control channels are configured. Link control signal transmission method.
(Item 2)
The uplink control signal transmission method according to item 1, wherein the resource allocation information further includes information on a position of a subframe in which the resource region is transmitted.
(Item 3)
The method of claim 1, wherein the resource allocation information further includes information on a frequency partition to which the plurality of uplink control channels are allocated.
(Item 4)
The uplink control signal transmission method according to item 1, wherein the resource allocation information is broadcast.
(Item 5)
The method of claim 1, wherein the plurality of uplink control channels include at least one of a bandwidth request channel (BRCH) and a feedback channel.
(Item 6)
6. The uplink control signal transmission method according to item 5, wherein the feedback channel includes a fast feedback channel (FFBCH) and a HARQ (hybrid automatic repeat request) feedback channel (HFBCH; HARQ feedback channel). .
(Item 7)
6. The uplink control signal transmission method according to item 5, wherein a radio resource for the feedback channel and a radio resource for the BRCH are sequentially allocated.
(Item 8)
The size of the radio resource is the number of resource units to which the BRCH or the feedback channel included in the plurality of uplink control channels is allocated, or the number of the BRCH or the feedback channel. An uplink control signal transmission method according to claim 1.
(Item 9)
9. The uplink control signal transmission method according to item 8, wherein the BRCH resource unit includes 6 OFDM (Orthogonal Frequency Division Multiplexing) symbols in the time domain and 6 subcarriers in the frequency domain.
(Item 10)
The method of claim 8, wherein the resource unit of the feedback channel includes 2 OFDM symbols in the time domain and 2 subcarriers in the frequency domain when the feedback channel includes HFBCH.
(Item 11)
The uplink control signal transmission method of claim 8, wherein the resource unit of the feedback channel includes 6 OFDM symbols in the time domain and 2 subcarriers in the frequency domain when the feedback channel includes FFBCH.
(Item 12)
The method of claim 1, wherein the position of the reference uplink control channel in the resource region is pre-determined.
(Item 13)
In a wireless communication system,
An RF (Radio Frequency) unit configured to transmit or receive wireless signals; and
A processor coupled to the RF unit;
The processor is
Receiving resource allocation information for each of a plurality of uplink control channels;
Configured to transmit an uplink control signal via any one of the plurality of uplink control channels;
Resources sequentially adjacent to each other based on one reference uplink control channel selected from among the plurality of uplink control channels are allocated to each of the plurality of uplink control channels,
The resource allocation information includes a radio resource size allocated to each of the plurality of uplink control channels in a resource region in which the plurality of uplink control channels are configured. .
(Item 14)
The terminal according to item 13, wherein the resource allocation information further includes information on a position of a subframe in which the resource region is transmitted.
(Item 15)
The terminal of claim 13, wherein the plurality of uplink control channels include at least one of a bandwidth request channel (BRCH) and a feedback channel.

  According to the present invention, the plurality of uplink control channels are configured to be adjacent to each other in the resource region, and the control signal is transmitted through the plurality of uplink control channels. As a result, information on the size of the uplink control channel required for the configuration of the uplink control channel is transmitted to the minimum, and signaling overhead can be reduced.

1 shows a wireless communication system. It is a block diagram which shows the transmitter and receiver which concern on one Example of this invention. An example of a frame structure is shown. 2 shows an example of a resource unit used for an uplink control channel in an IEEE 802.16m system. 3 shows an uplink control signal transmission method according to an embodiment of the present invention. 2 shows an example of an uplink control channel assigned by the present invention. An example in which the assigned uplink control channels HFBCH and FFBCH are assigned in one DRU is shown. 4 shows another example of an uplink control channel allocated by the present invention. 4 shows another example of an uplink control channel allocated by the present invention. 4 shows another example of an uplink control channel allocated by the present invention. An example of the mapping relationship between 6 downlink subframes and 2 uplink subframes is shown. An example of the mapping relationship between 5 downlink subframes and 3 uplink subframes is shown. 7 shows another example of a mapping relationship between 5 downlink subframes and 3 uplink subframes. An example of the mapping relationship between four downlink subframes and four uplink subframes is shown. An example of the mapping relationship between 3 downlink sub-frames and 5 uplink sub-frames is shown. An example of the mapping relationship between two downlink subframes and six uplink subframes is shown. 7 shows another example of a mapping relationship between two downlink subframes and six uplink subframes.

  The following technologies, CDMA (Code Division Multiple Access), FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), OFDMA (Orthogonal Frequency Division Multiple Access), and SC-FDMA (Single Carrier Frequency Division Multiple Access) It can be used for various wireless communication systems such as. The CDMA can be implemented by a radio technology such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. The TDMA may be implemented by a radio technology such as GSM (Global System for Mobile Communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented with a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), and the like. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is a part of UMTS (Universal Mobile Telecommunication Systems). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is an E-UMTS (Evolved UMTS) that uses E-UTRA (Evolved-UMTS Terrestrial Radio Access) and a part of E-UMTS (Evolved UMTS) Adopt SC-FDMA in the uplink. LTE-A (Advanced) is an evolution of 3GPP LTE.

  In order to clarify the explanation, IEEE 802.16m is mainly described, but the technical idea of the present invention is not limited to this.

  FIG. 1 shows a wireless communication system.

  The wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service to a specific geographical area (generally called a cell) 15a, 15b, 15c. The cell is divided into a plurality of regions (referred to as sectors). A user equipment (UE) 12 may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), and a wireless device (wireless device). ), PDA (Personal Digital Assistant), wireless modem, and handheld device. The base station 11 generally means a fixed station that communicates with the terminal 12, and is expressed in other terms such as an eNB (evolved-NodeB), a BTS (Base Transceiver System), and an access point (Access Point). Can be called.

  A terminal belongs to one cell, and a cell to which the terminal belongs is called a serving cell. A base station that provides communication services to a serving cell is called a serving base station (serving BS). Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is referred to as a neighbor cell. A base station that provides a communication service to an adjacent cell is referred to as an adjacent base station (neighbor BS). The serving cell and the neighboring cell are relatively determined based on the terminal.

  This technique can be used for the downlink or the uplink. In general, the downlink means communication from the base station 11 to the terminal 12, and the uplink means communication from the terminal 12 to the base station 11. On the downlink, the transmitter is part of the base station 11 and the receiver is part of the terminal 12. On the uplink, the transmitter is part of the terminal 12 and the receiver is part of the base station 11.

  FIG. 2 is a block diagram illustrating a transmitter and a receiver according to an embodiment of the present invention.

  Referring to FIG. 2, the transmitter 100 includes a processor 110 and an RF unit 120. The processor 110 processes channel information such as the size or index of the uplink control channel to be allocated to allocate the uplink control channel, and the RF unit 120 transmits the channel information.

  The receiver 200 includes a processor 210 and an RF unit 220. The processor 210 processes the channel information to generate an uplink control signal, and the RF unit 220 transmits the uplink control signal.

  The transmitter 100 and the receiver 200 show a single-input single-output (SISO) system having one transmission antenna and one reception antenna. However, the technical idea of the present invention includes a plurality of techniques. The present invention can also be applied as it is to a multiple-input multiple-output (MIMO) system having a plurality of transmission antennas and a plurality of reception antennas.

  The transmitter 100 and the receiver 200 indicate OFDM (Orthogonal Frequency Division Multiplexing) / OFDMA (Orthogonal Frequency Division Multiple Access) based systems. It can be applied as it is to other wireless connection system-based systems such as CDMA (Code Division Multiple Access).

  FIG. 3 shows an example of a frame structure.

  Referring to FIG. 3, the super frame (SF) includes a super frame header (SFH) and four frames (frame, F0, F1, F2, F3). Each frame has the same length within the superframe. Although the size of each super frame is 20 ms and the size of each frame is 5 ms, it is not limited to this. The length of the superframe, the number of frames included in the superframe, the number of subframes included in the frame, and the like can be variously changed. The number of subframes included in a frame can be variously changed according to a channel bandwidth and a CP (Cyclic Prefix) length.

  The superframe header may carry important system parameters and system configuration information. The super frame header can be disposed at the forefront of the super frame. SFH can be classified into a first SFH (P-SFH; Primary SFH) and a second SFH (S-SFH; Secondary SFH). P-SFH and S-SFH can be transmitted in every superframe.

  One frame includes a plurality of subframes (subframe, SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7). Each subframe can be used for uplink or downlink transmission. One subframe includes a plurality of orthogonal frequency multiplexing (OFDM) symbols in the time domain (time domain) or an orthogonal frequency division frequency (du) in the frequency domain (b) in the frequency domain. Including. The OFDM symbol is used to express one symbol period, and can be called by another name such as an OFDMA symbol or an SC-FDMA symbol according to a multiple access scheme. A subframe may be composed of 5, 6, 7 or 9 OFDM symbols, but this is merely an example, and the number of OFDM symbols included in the subframe is not limited. The number of OFDM symbols included in the subframe can be variously changed according to the channel bandwidth and the CP length. A subframe type may be defined according to the number of OFDM symbols included in the subframe. For example, a type-1 subframe may be defined to include 6 OFDM symbols, a type-2 subframe includes 7 OFDM symbols, a type-3 subframe includes 5 OFDM symbols, and a type-4 subframe includes 9 OFDM symbols. One frame can include the same type of subframes. Alternatively, one frame may include different types of subframes. That is, the number of OFDM symbols included in each subframe in one frame is the same or different. Alternatively, the number of OFDM symbols in at least one subframe in one frame is different from the number of OFDM symbols in the remaining subframes in the frame.

  A TDD (Time Division Duplex) method or an FDD (Frequency Division Duplex) method can be applied to the frame. In the TDD scheme, each subframe is used for uplink transmission or downlink transmission at different times at the same frequency. That is, a subframe in a TDD frame is divided into an uplink subframe and a downlink subframe in the time domain. In the FDD scheme, each subframe is used for uplink transmission or downlink transmission at different frequencies at the same time. That is, subframes in the FDD frame are divided into an uplink subframe and a downlink subframe in the frequency domain. Uplink transmission and downlink transmission occupy different frequency bands and can be performed simultaneously.

  The subframe includes a plurality of physical resource units (PRUs) in the frequency domain. The PRU is a basic physical unit for resource allocation, includes a plurality of consecutive OFDM symbols in the time domain, and includes a plurality of consecutive subcarriers in the frequency domain. The number of OFDM symbols included in the PRU is the same as the number of OFDM symbols included in one subframe. Therefore, the number of OFDM symbols in the PRU can be determined according to the subframe type. For example, when one subframe includes 6 OFDM symbols, the PRU may be defined by 18 subcarriers and 6 OFDM symbols.

  A logical resource unit (LRU) is a basic logical unit for distributed resource allocation and continuous resource allocation. The LRU is defined by a plurality of OFDM symbols and a plurality of subcarriers, and includes a pilot used in the PRU. Therefore, the number of appropriate subcarriers in one LRU depends on the number of assigned pilots.

  A distributed resource unit (DRU) can be used to obtain a frequency diversity gain. The DRU includes subcarrier groups distributed in one frequency partition. The size of the DRU is the same as the size of the PRU. The smallest unit forming the DRU is one subcarrier. A distributed logical resource unit (DLRU) can be obtained by performing subcarrier permutation within the DRU.

  A continuous resource unit (CRU) can be used to obtain a frequency selective scheduling gain (CRU). The CRU includes a localized subcarrier group. The size of the CRU is the same as the size of the PRU. A continuous logical resource unit (CLRU) can be obtained by directly mapping CRUs.

  Meanwhile, a fractional frequency reuse (FFR) technique may be used in a cellular system where multiple cells exist. The FFR technique is a technique of dividing the entire frequency band into a plurality of frequency partitions and assigning the frequency partition to each cell. Different frequency partitions may be allocated between adjacent cells through the FFR technique, and the same frequency partition may be allocated between distant cells. Alternatively, each frequency partition is assigned to each cell, and each cell can use all frequency partitions except frequency partitions that cause inter-cell interference (ICI) between adjacent cells. Therefore, inter-cell interference can be reduced and the performance of the terminal located at the end of the cell can be improved.

  Hereinafter, a control channel for transmitting a control signal or a feedback signal will be described. The control channel can be used for transmission of various types of control signals for communication between the base station and the terminal. Hereinafter, the control channel described may be applied to an uplink control channel, a downlink control channel, and a fast feedback channel.

  FIG. 4 shows an example of resource units used for an uplink control channel in an IEEE 802.16m system. A resource unit 300 is a resource allocation unit used for transmission of an uplink control channel, and is also referred to as a tile. The tile 300 is a physical resource allocation unit or a logical resource allocation unit. The control channel includes at least one tile 300, and the tile 300 is configured with at least one subcarrier in the frequency domain on at least one OFDM symbol in the time domain. The tile 300 means a set of a plurality of subcarriers adjacent to the time domain and the frequency domain. The tile 300 includes a plurality of data subcarriers and / or pilot subcarriers. A control signal sequence can be mapped to the data subcarrier, and a pilot for channel estimation can be mapped to the pilot subcarrier.

  The tile 300 includes three mini units 310, 320, and 330. A mini unit is also called a mini tile. The tile 300 may be configured with a plurality of mini-tiles, and the minitile may be configured with at least one subcarrier in the frequency domain on at least one OFDM symbol in the time domain. Each of the minitiles 310, 320, 330 includes two contiguous subcarriers over six OFDM symbols. The mini tiles 310, 320, 330 in the tile 300 may not be adjacent to each other in the frequency domain. This is because at least one minitile of another tile is disposed between the first minitile 310 and the second minitile 320 and / or between the second minitile 320 and the third minitile 330. Means you can. Frequency diversity can be obtained by arranging the mini tiles 310, 320, and 330 in the tile 300 in a distributed manner in the frequency domain.

  The number of OFDM symbols in the time domain and / or the number of subcarriers in the frequency domain included in the minitile is merely illustrative and not limiting. The number of OFDM symbols included in the minitile may vary depending on the number of OFDM symbols included in the subframe. For example, when the number of OFDM symbols included in one subframe is 6, the number of OFDM symbols included in the minitile is 6.

  An OFDM symbol means a duration in the time domain, and is not necessarily limited to a system based on OFDM / OFDMA. This can be called by other names such as a symbol interval, and the technical idea of the present invention is not limited to a specific multiple access scheme by the name of OFDM symbol. Also, the subcarrier means an allocation unit in the frequency domain, and here, one subcarrier is a unit, but a subcarrier set unit can be used.

  The control channel is designed in consideration of the following points.

  (1) A plurality of tiles included in a control channel can be distributed in a time domain or a frequency domain in order to obtain a frequency diversity gain. For example, when considering that a DRU includes 3 tiles composed of 6 consecutive subcarriers on 6 OFDM symbols, the control channel includes 3 tiles, each tile in the frequency domain or Can be distributed in the time domain. Alternatively, the control channel may include at least one tile, and the tile may be composed of a plurality of mini tiles, and the plurality of mini tiles may be distributed in the frequency domain or the time domain. For example, a minitile can be composed of (OFDM symbol × subcarrier) = 6 × 6, 3 × 6, 2 × 6, 1 × 6, 6 × 3, 6 × 2, 6 × 1, and the like. Assuming that IEEE802.16e (OFDM symbol × subcarrier) = 3 × 4 control channel including PUSC structure tiles and control channel including minitiles are multiplexed in FDM (frequency division multiplexing) scheme, (OFDM symbol × subcarrier) = 6 × 2, 6 × 1, etc. When considering only control channels including minitiles, minitiles can be composed of (OFDM symbols × subcarriers) = 6 × 2, 3 × 6, 2 × 6, 1 × 6, and so on.

  (2) In order to support a high-speed terminal, the number of OFDM symbols constituting the control channel must be minimized. For example, in order to support a terminal moving at 350 km / h, the number of OFDM symbols constituting the control channel is suitably 3 or less.

  (3) The transmission power per symbol of the terminal is limited, and it is more advantageous to increase the number of OFDM symbols constituting the control channel in order to increase the transmission power per symbol of the terminal. Therefore, an appropriate number of OFDM symbols must be determined in consideration of transmission power per symbol of the high-speed terminal (2) and the terminal (3).

  (4) For coherent detection, pilot subcarriers for channel estimation must be evenly distributed in the time domain or frequency domain. Coherent detection is a method of obtaining data carried on a data subcarrier after performing channel estimation using a pilot. Due to power boosting of pilot subcarriers, the transmission power per symbol can be kept the same only if the number of pilots per OFDM symbol in the control channel is the same.

  (5) For non-coherent detection, the control signal must consist of an orthogonal code / sequence or a semi-orthogonal code / sequence or be spread. .

  Among the control channels, the uplink control channel includes a fast feedback channel (FFBCH), a bandwidth request channel (BRCH), a HARQ feedback channel (HFBCH), a hybrid automatic repeat feedback, and an HARQ feedback channel (HFBCH). A link ranging channel or the like may be included. The fast feedback channel is a channel for faster uplink transmission than general uplink data. The bandwidth request channel is a channel for requesting radio resources for transmitting uplink data or control signals to be transmitted by the terminal. The HARQ feedback channel is a channel for transmitting an ACK (Acknowledgement) / NACK (Non-acknowledgement) signal as a response to data transmission. The fast feedback channel, bandwidth request channel, HARQ feedback channel, etc. can be located anywhere in the uplink subframe or frame. The uplink ranging channel is used for uplink synchronization. Further, the uplink ranging channel can be divided into a ranging channel for non-synchronized UEs and a ranging channel for synchronized terminals. The ranging channel for the synchronous terminal is used for periodic ranging. A ranging channel for an asynchronous terminal is used for initial access and handover.

  Hereinafter, an uplink control signal transmission method will be described.

  In general, in assignment of an uplink control channel for uplink control signal transmission, whether or not an uplink control channel can be assigned can be determined for each FFR region. However, if the uplink control channel is allocated to all FFR regions, signaling overhead may occur in channel allocation. In addition, downlink and uplink FFR partitioning methods may be different, and at this time, an uplink control channel allocation may be mixed. Therefore, the base station can determine the FFR region to which the uplink control channel is allocated through broadcast information such as the size of the uplink control channel. For example, the number of channels need not be so large as to be allocated to all FFR regions, and a BRCH that cannot be subjected to power control can be allocated to only one FFR region. In addition, FFBCH, HFBCH, and the like that can perform power control can be assigned to all FFR regions or can be assigned for each region.

  FIG. 5 shows an uplink control signal transmission method according to an embodiment of the present invention.

  Referring to FIG. 5, in step S400, the base station transmits resource allocation information for each of a plurality of uplink control channels to a terminal. The plurality of uplink control channels may be at least one of BRCH, EMBS feedback channel, and feedback channel. The resource allocation information may include a size of a radio resource allocated to each of the plurality of uplink control channels in a resource region in which the plurality of uplink control channels are configured, and the resource region May include information regarding the position of the subframe in which is transmitted. The size of the radio resource may be the size of the corresponding uplink control channel itself, or may be the number of uplink control channels of the same type as the corresponding uplink control channel. For example, when the number of BRCH is 3 (BRCH # 0, BRCH # 1, BRCH # 2), the size of the radio resource may be the size of one BRCH or the size of three BRCHs. It may be. In addition, the resource allocation information may determine a frequency partition to which the uplink control channel is allocated when an FFR technique is used. For example, the uplink control channel can be assigned to a reuse 1 region. At this time, the reuse 1 area is the first frequency partition (FP0). Alternatively, the uplink control channel can be allocated to a reuse 3 region with the highest transmission power. At this time, the reuse 3 area is any one of the second frequency partition (FP1), the third frequency partition (FP2), and the fourth frequency partition (FP3). The resource allocation information can be broadcast and can be included in the S-SFH.

  The size of the radio resource allocated to each of the uplink control channels can be transmitted as broadcast information. Broadcast information is information (non-user-specific) that all terminals belonging to a base station must know, and is broadcast channel (BCH) or A-MAP (Advanced-MAP) = unicast. It can be transmitted via a service control channel (USCCH). In addition, information on the position of the subframe in which the resource region is transmitted, that is, index information of the uplink control channel may be transmitted as unicast information. Unicast information is (user-specific) information transmitted to a specific terminal, and can be transmitted via A-MAP.

  According to the transmitted resource allocation information, adjacent resources on a resource region are allocated to a plurality of uplink control channels. One of the plurality of uplink control channels can be set as a reference uplink control channel, and adjacent radio resources are sequentially allocated to the remaining uplink control channels with reference to the reference uplink control channel. It is done. The position of the reference uplink control channel on the resource region may be pre-determined.

  In step S410, the terminal transmits an uplink control signal to the base station through one of the uplink control channels. When the uplink control signal is a feedback signal, the feedback signal can be transmitted at a position of a subframe in which the resource region included in the resource allocation information is transmitted.

  FIG. 6 shows an example of an uplink control channel allocated according to the present invention.

  Referring to FIG. 6, first, BRCH 500 is assigned as an uplink control channel. The BRCH 500 is a contention based channel, and all terminals belonging to the base station need to know the area to which the BRCH 500 is allocated. The BRCH 500 can start with DRU # 0. Alternatively, the BRCH 500 can be located not only in DRU # 0 but also in a position fixed to a standard document such as DRU # last or immediately after the EMBS feedback channel. Therefore, since the terminal can estimate the start position of BRCH 500, the start position of BRCH 500 may not be transmitted as broadcast information. However, the BRCH 500 size needs to be transmitted as broadcast information in order to estimate the start position of another adjacent control channel.

  An EMBS feedback channel 510 is assigned adjacent to the BRCH 500. The EMBS feedback channel 510 can start from the end position of the BRCH 500 so as to be adjacent to the BRCH 500. That is, when the BRCH 500 starts from DRU # 0, the start position of the EMBS feedback channel 510 is 'DRU # 0 + BRCH size'. Alternatively, the EMBS feedback channel 510 can start from a fixed location in a standard document, such as DRU # 0 or DRU # last. Accordingly, since the terminal can estimate the start position of the EMBS feedback channel 510, the start position of the EMBS feedback channel 510 may not be transmitted as broadcast information. However, the size of the EMBS feedback channel 510 needs to be transmitted as broadcast information in order to estimate the starting position of other adjacent control channels.

  A feedback channel 520 is assigned adjacent to the EMBS feedback channel 510. The feedback channel 520 corresponds to a non-contention based channel. Each terminal needs to know the region of the feedback channel 520 allocated to each terminal by the base station, and all the terminals know the region to which the feedback channel 520 is allocated for the allocation of the data channel or the sounding channel. be able to. The feedback channel 520 is divided into two types, HFBCH 530 and FFBCH 540. HFBCH is a channel that transmits HARQ feedback, and transmits ACK / NACK for a received signal. The FFBCH is a channel allocated for quick uplink transmission, and can carry a feedback message.

  HFBCH 530 is assigned adjacent to EMBS feedback channel 510. The HFBCH 530 can start from the end position of the EMBS feedback channel 510 to be adjacent to the EMBS feedback channel 510. That is, the start position of HFBCH is “DRU # 0 + BRCH size + EMBS feedback channel size”. Alternatively, the HFBCH 530 can start from a fixed location in the standard document, such as DRU # 0 or DRU # last. Therefore, since the terminal can estimate the start position of HFBCH 530, the start position of HFBCH 530 may not be transmitted as broadcast information. In addition, when the information about the number of downlink grants (DL grants) is included in the A-MAP, the size of the HFBCH 530 can be known by the terminal that has read the A-MAP, so the size of the HFBCH 530 is also broadcast information. May not be transmitted.

  For transmission of HARQ feedback, an index of the HFBCH 530 for each terminal from the base station, that is, information on the position of the uplink subframe where HARQ feedback is transmitted can be transmitted as unicast information. In general, a terminal that has read A-MAP can know an index of a downlink grant assigned to itself, and thus transmits HARQ feedback in an uplink subframe determined in advance to correspond to the index. can do. Therefore, the HFBCH 530 index may not be transmitted as unicast information for each terminal. However, if the terminal cannot know the index of the downlink grant, the index of the HFBCH 530 used for each terminal needs to be transmitted as unicast information. In addition, in the case of persistent allocation (PA) HFBCH, since the terminal reads A-MAP, it cannot know the size and order of persistent allocation HFBCH except for the permanent allocation information to which the terminal itself has been allocated. An index of permanently allocated HFBCH used for each terminal must be transmitted as unicast information. The index of the persistent allocation HFBCH can be transmitted by defining a new MAP for the persistent allocation HFBCH or by attaching it to a header of downlink data.

  The FFBCH 540 is assigned with the index reversed from the end of the feedback channel 520 (DRU # last). Alternatively, the FFBCH 540 can be located after the BRCH 500, the EMBS feedback channel 510, the HFBCH 530, or can start from a fixed location in the standard document, such as DRU # 0 or DRU # last. Therefore, since the terminal can estimate the start position of FFBCH 540, the start position of FFBCH 540 may not be transmitted as broadcast information. Also, the size of FFBCH 540 need not be transmitted as broadcast information.

  For transmission of fast feedback, an index of FFBCH 540 for each terminal from the base station, that is, information on an uplink subframe position where fast feedback is transmitted may be transmitted as unicast information. The FFBCH 540 needs to transmit the index of the FFBCH 540 used for each terminal as unicast information like the persistent allocation HFBCH 530. The base station can transmit the index of the FFBCH 540 to a terminal that determines that the FFBCH 540 needs to be allocated. The index of the FFBCH 540 can be transmitted by defining a new MAP for the FFBCH 540 or by attaching it to the header of the downlink data.

  The size information of the uplink control channel can be assigned to each channel size unit. Since 3 or 6 6 × 6 tiles are one BRCH unit, the BRCH is assigned a BRCH size. Since 3 HFBCH are 2 × 2 HMT units, one HFBCH unit is allocated to the HFBCH size. Since FFBCH is a unit of one FFBCH, 3 × 2 FMTCHs are assigned to each unit. In this case, if the uplink control channels are allocated so as to be logically adjacent to each other by the proposed method, a plurality of uplink control channels can coexist in one DRU. Therefore, the uplink control channel can be defined separately from the uplink data channel.

  Alternatively, the size of the uplink control channel can be assigned to a unit of tile to be used. In this case, if uplink control channels are logically adjacent to each other by the proposed method, a plurality of uplink control channels can coexist in tiles in one DRU. Therefore, the uplink control channel can be defined separately from the uplink data channel.

  FIG. 7 shows an example in which the allocated uplink control channels HFBCH and FFBCH are allocated in one DRU. Referring to FIG. 7, the DRU 600 includes 6 OFDM symbols and includes 3 6 × 6 tiles 610, 620, and 630. HFBCH resources exist in three distributed 2 × 6 size feedback mini-tiles (FMTs), each FMT having a 2 × 2 size HARQ mini-tiles (HMTs). -Tile). Three FMTs support six HFBCHs. The FFBCH resources exist in three distributed 2 × 6 FMTs, and the three FMTs support one HFBCH.

  FIG. 8 shows another example of an uplink control channel allocated according to the present invention. BRCH 700 starts with DRU # 0, and EMBS feedback channel 710 starts with 'DRU # 0 + BRCH size'. The FFBCH 730 starts from 'DRU # 0 + BRCH size + EMBS feedback channel size', and the HFBCH 740 is assigned with the index reversed from the end of the feedback channel 720 (DRU # last). That is, the position of the FFBCH 730 and the position of the HFBCH 740 can be changed.

  FIG. 9 shows another example of an uplink control channel allocated according to the present invention. The EMBS feedback channel 800 starts with DRU # 0, and the BRCH 810 starts with 'DRU # 0 + EMBS feedback channel size'. The HFBCH 830 starts from 'DRU # 0 + EMBS feedback channel size + BRCH size', and the FFBCH 840 is assigned with the index reversed from the end of the feedback channel 820 (DRU # last). That is, the position of the EMBS feedback channel 800 and the position of the BRCH 810 can be changed.

  FIG. 10 shows another example of an uplink control channel allocated according to the present invention. BRCH 900 is assigned starting with DRU # last and reversing the index, and EMBS feedback channel 910 starts with 'DRU # last-BRCH size'. HFBCH 930 starts from 'DRU # last-BRCH size-EMBS feedback channel size' and FFBCH 940 starts from the beginning of feedback channel 920 (DRU # 0). That is, the overall order of uplink control channels can change.

  As illustrated in FIGS. 8 to 10, the order of the uplink control channels can be changed, and the change of the channel order can be combined.

  Since the DRU number is a logical concept in the uplink control channel assignment, even if the same DRU number is assigned to each cell, the actual physical resource position can be different. However, since the BRCH and the EMBS feedback channel are based on Code Division Multiplexing (CDM), inter-cell physical resource in order to avoid inter-cell interference (ICI) of adjacent data channels. The position can be assigned the same.

  On the other hand, when the number of downlink subframes and the number of uplink subframes are different in one frame, it is necessary to determine in advance the mapping relationship between the downlink grant and the corresponding HFBCH in the allocation of HFBCH. Such mapping relationships must be fixed by standard documents.

  FIG. 11 shows an example of a mapping relationship between six downlink subframes and two uplink subframes. HARQ feedback information for the downlink grants of the first to third downlink subframes is sequentially assigned to the HFBCHs located in the first uplink subframe, and the downlink grants of the fourth to sixth downlink subframes. HARQ feedback information for is sequentially assigned to the HFBCH located in the second uplink subframe.

  FIG. 12 shows an example of the mapping relationship between 5 downlink subframes and 3 uplink subframes. HARQ feedback information for the downlink grants of the first and second downlink subframes is sequentially assigned to the HFBCH located in the first uplink subframe, and the downlinks of the third and fourth downlink subframes HARQ feedback information for the link grant is sequentially assigned to the HFBCH located in the second uplink subframe. Also, HARQ feedback information for the downlink grant of the fifth downlink subframe is assigned to the HFBCH located in the third uplink subframe.

  FIG. 13 shows another example of the mapping relationship between 5 downlink subframes and 3 uplink subframes. HARQ feedback information for the downlink grant of the first to third downlink subframes is sequentially assigned to the HFBCH located in the first uplink subframe, and HARQ feedback for the downlink grant of the fourth downlink subframe. Information is sequentially assigned to the HFBCH located in the second uplink subframe. Also, HARQ feedback information for the downlink grant of the fifth downlink subframe is assigned to the HFBCH located in the third uplink subframe.

  FIG. 14 shows an example of a mapping relationship between four downlink subframes and four uplink subframes. Since the number of downlink subframes and the number of uplink subframes are the same, HARQ feedback information for the downlink grant of each downlink subframe is assigned to the HFBCH located in the uplink subframe of the corresponding number. .

  FIG. 15 shows an example of the mapping relationship between 3 downlink subframes and 5 uplink subframes. HARQ feedback information for the downlink grant of each downlink subframe is assigned to the HFBCH located in the uplink subframe of the number corresponding thereto. The fourth or fifth uplink subframe is not allocated for HARQ feedback information.

  FIG. 16 shows an example of a mapping relationship between two downlink subframes and six uplink subframes. HARQ feedback information for the downlink grant of each downlink subframe is assigned to the HFBCH located in the uplink subframe of the number corresponding thereto. The third through sixth uplink subframes are not allocated for HARQ feedback information. In this case, the latency is 1 subframe between HFBCHs corresponding to the uplink grant.

  FIG. 17 shows another example of the mapping relationship between two downlink subframes and six uplink subframes. HARQ feedback information for the downlink grant of the first downlink subframe is assigned to the HFBCH located in the second uplink subframe, and HARQ feedback information for the downlink grant of the second downlink subframe is Assigned to HFBCH located in 3 uplink subframes. The first and fourth to sixth uplink subframes are not allocated for HARQ feedback information. In this case, the delay time (latency) is 2 subframes between HFBCHs corresponding to the uplink grant.

  The present invention can be implemented in hardware, software, or a combination thereof. In hardware implementation, ASIC (application specific integrated circuit), DSP (digital signal processing), PLD (programmable logic device), mmPA processor (FPGA), FPGA processor designed to perform the functions described above. , A microprocessor, other electronic units, or a combination thereof. In software implementation, it may be implemented by a module that performs the above-described functions. Software can be stored in the memory unit and executed by the processor. For the memory unit and the processor, various means well known to those skilled in the art can be adopted.

  Although the present invention has been described with reference to the embodiments, those skilled in the art can make various modifications and modifications to the present invention without departing from the technical idea and scope of the present invention. It can be understood that it can be implemented with changes. Accordingly, the invention is not limited to the embodiments described above, but includes all embodiments within the scope of the claims.

Claims (14)

A method for transmitting an uplink control signal by Oite user equipment to the radio communication system (UE), the method comprising
The method comprising: receiving a resource allocation information for a plurality of uplink control channel from a base station, said plurality of uplink control channel includes a feedback channel and bandwidth request channel, and that,
And a transmitting uplink control signals to the base station via at least one of the plurality of uplink control channel,
The allocation order of the plurality of uplink control channels in the frequency domain is the feedback channel, the bandwidth request channel,
The resource allocation information includes a radio resource size allocated to the feedback channel . The method of claim 1, wherein an index of a logical resource unit assigned to the feedback channel is smaller than an index of a logical resource unit assigned to the bandwidth request channel. The resource allocation information further includes method of claim 1 information on the plurality of uplink control channels assigned frequency partition (FP). The resource allocation information is broadcast, the method according to claim 1. The feedback channel comprises a Fast feedback channel (FFBC H) and HARQ (Hybrid Automatic Repeat R equest) feedback channel (HFBC H), Method according to claim 1.   The method according to claim 5, wherein the feedback channel allocation order is the HFBCH and the FFBCH. The method according to claim 6, wherein an index of a logical resource unit allocated to the HFBCH is smaller than an index of a logical resource unit allocated to the FFBCH. The method of claim 1, wherein a size of a radio resource allocated to the feedback channel indicates a number of logical resource units allocated to the feedback channel. The method of claim 1, wherein the size of radio resources allocated to the feedback channel includes the number of HFBCHs. The method of claim 1, wherein the resource allocation information further includes a position to which the bandwidth request channel is allocated. The method of claim 1, further comprising transmitting uplink data to the base station via a data channel. A Contact Keru user equipment to the radio communication system (UE), the UE,
An RF (Radio Frequency) unit configured to transmit or receive wireless signals ;
And a processor coupled with the RF unit,
The processor is
The method comprising: receiving a resource allocation information for a plurality of uplink control channel from a base station, said plurality of uplink control channel includes a feedback channel and bandwidth request channel, and that,
Transmitting an uplink control signal to the base station via at least one of the plurality of uplink control channels ;
Is configured to run
The allocation order of the plurality of uplink control channels in the frequency domain is the feedback channel, the bandwidth request channel,
The resource allocation information includes a size of a radio resource allocated to the feedback channel . The UE of claim 12, wherein an index of a logical resource unit allocated to the feedback channel is smaller than an index of a logical resource unit allocated to the bandwidth request channel. The UE according to claim 12, wherein the resource allocation information further includes information on a frequency partition (FP) to which the plurality of uplink control channels are allocated.

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