KR20110070684A - Method and apparatus of transmitting uplink control channel in wireless communication system - Google Patents

Abstract

PURPOSE: An UL control channel transmitting method and apparatus in a wireless communication system are provided to transmit information such as the size of an UL control channel for the configuration of the UL control channel to the minimum. CONSTITUTION: A BS(Base Station) transmits the resource assignment information of a ranging channel to an MS(Mobile Station)(S100). The BS transmits the resource assignment information of a bandwidth request channel and a feedback channel to the MS(S110). According to the resource assignment information of the ranging channel and the resource assignment information of the bandwidth request channel and the feedback channel, the MS assigns UL(UpLink) resources to the ranging channel, the feedback channel, and the bandwidth request channel(S120).

Description

Method and device for transmitting uplink control channel in wireless communication system {METHOD AND APPARATUS OF TRANSMITTING UPLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM}

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

The Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard is the sixth standard for the International Mobile Telecommunications (IMT-2000) in the ITU-Radiocommunication Sector (ITU-R) under the International Telecommunication Union (ITU) in 2007. It was adopted under the name OFDMA TDD '. ITU-R is preparing the IMT-Advanced system as the next generation 4G mobile communication standard after IMT-2000. The IEEE 802.16 Working Group (WG) decided to implement the IEEE 802.16m project in late 2006 with the aim of creating an amendment specification for the existing IEEE 802.16e as a standard for IMT-Advanced systems. As can be seen from the above objectives, the IEEE 802.16m standard implies two aspects: the past continuity of modification of the IEEE 802.16e standard and the future continuity of the specification for next generation IMT-Advanced systems. Therefore, the IEEE 802.16m standard is required to satisfy all the advanced requirements for the IMT-Advanced system while maintaining compatibility with the Mobile WiMAX system based on the IEEE 802.16e standard.

In the case of broadband wireless communication systems, effective transmission and reception techniques and utilization methods have been proposed to maximize the efficiency of limited radio resources. One of the systems considered in the next generation wireless communication system is an Orthogonal Frequency Division Multiplexing (OFDM) system that can attenuate inter-symbol interference (ISI) effects with low complexity. OFDM converts serially input data symbols into N parallel data symbols and carries them on N subcarriers, respectively. The subcarriers maintain orthogonality in the frequency dimension. Each orthogonal channel experiences mutually independent frequency selective fading, thereby reducing complexity at the receiving end and lengthening the interval of transmitted symbols, thereby minimizing inter-symbol interference.

Orthogonal Frequency Division Multiple Access (OFDMA) refers to a multiple access method for realizing multiple access by independently providing each user with a portion of available subcarriers in a system using OFDM as a modulation method. OFDMA provides each user with a frequency resource called a subcarrier, and each frequency resource is provided to a plurality of users independently so that they do not overlap each other. Eventually, frequency resources are allocated mutually exclusively for each user. In an OFDMA system, frequency diversity scheduling can be obtained through frequency selective scheduling, and subcarriers can be allocated in various forms according to permutation schemes for subcarriers. In addition, the spatial multiplexing technique using multiple antennas can increase the efficiency of the spatial domain.

Since the 802.16m system has backward compatibility, it can support not only the 802.16m terminal but also the 802.16e terminal. When the 802.16m system supports the 802.16e terminal, this may be referred to as a legacy support mode. The configuration of the uplink control channel in the legacy support mode may be different from the configuration of the uplink control channel in the 16m only mode supporting only the 802.16m terminal.

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

In one aspect, a method for transmitting an uplink control channel in a wireless communication system is provided. The method may include receiving resource allocation information of a first uplink control channel for transmitting an uplink synchronization signal, receiving resource allocation information of a second uplink control channel, resource allocation information of the first uplink control channel, and Assigning a first uplink control channel resource and a second uplink control channel resource to the first uplink control channel and the second uplink control channel based on resource allocation information of the second uplink control channel, And transmitting the first uplink control channel and the second uplink control channel to a base station, wherein the first uplink control channel resource is located in a first resource unit of a plurality of resource units constituting a logical resource region. And allocated in the logical resource region in the order of the first uplink control channel resource and the second uplink control channel resource. The index of the second uplink control channel resource may be greater than the index of the first uplink control channel resource. The second uplink control channel may include a feedback channel for transmitting uplink feedback and a bandwidth request channel (BRCH) for transmitting a bandwidth request signal, wherein the logical resource region An index of a resource allocated to the feedback channel may be smaller than an index of a resource allocated to the bandwidth request channel. The feedback channel includes a HARQ Feedback Channel (HFBCH) for transmitting Hybrid Automatic Request reQuest (HARQ) feedback and a Fast Feedback Channel (FFBCH) for transmitting Channel Quality Indicator (CQI) or MIMO information. The index of the resource allocated to the HARQ feedback channel in the logical resource region may be smaller than the index of the resource allocated to the fast feedback channel. Resource allocation information of the first uplink control channel and resource allocation information of the second uplink control channel may be broadcasted. Resource allocation information of the first uplink control channel may be transmitted every 40 ms. The resource allocation information of the second uplink control channel may be transmitted every one of 160 ms and 320 ms. Each resource unit may include six tiles, and each tile may include four consecutive subcarriers and six orthogonal frequency division multiplexing (OFDM) symbols. Allocating an uplink data region to the remaining logical resource region to which the first uplink control channel resource and the second uplink control channel resource are allocated, and transmitting uplink data mapped to the uplink data region to a base station. It may further include.

In another aspect, an apparatus for transmitting an uplink control channel in a wireless communication system is provided. The apparatus may further include receiving circuitry for receiving allocation information of a first uplink control channel and allocation information of a second uplink control channel from a base station and transmitting the first uplink control channel and the second uplink control channel. A first connection to the first uplink control channel and the second uplink control channel, respectively, based on the resource allocation information of the first uplink control channel and the resource allocation information of the second uplink control channel. A processor for allocating an uplink control channel resource and a second uplink control channel resource, wherein the first uplink control channel resource is located in a first resource unit of a plurality of resource units constituting a logical resource region; In the logical resource region, the first uplink control channel resource is allocated in the order of the second uplink control channel resource. The index of the second uplink control channel resource may be greater than the index of the first uplink control channel resource. The second uplink control channel may include a feedback channel for transmitting uplink feedback and a bandwidth request channel for transmitting a bandwidth request signal, and the index of a resource allocated to the feedback channel in the logical resource region is the bandwidth request. It may be smaller than the index of the resource allocated to the channel. The feedback channel may include a HARQ feedback channel for transmitting HARQ feedback and a fast feedback channel for transmitting CQI or MIMO information, and an index of a resource allocated to the HARQ feedback channel in the logical resource region is assigned to the fast feedback channel. It may be smaller than the index of the allocated resource. Resource allocation information of the first uplink control channel and resource allocation information of the second uplink control channel may be broadcast. Each resource unit may include six tiles, and each tile may include four consecutive subcarriers and six OFDM symbols.

By configuring an uplink control channel such that a plurality of uplink control channels are adjacent to each other in a resource region, signaling overhead such that information such as the size of an uplink control channel required for configuring an uplink control channel is transmitted to a minimum. It can reduce the signaling overhead.

1 shows a wireless communication system.
2 shows an example of a frame structure.
3 shows another example of a frame structure.
4 shows an example of a transmission period of the S-SFH.
5 shows an example of an uplink resource structure.
6 shows an example of a resource unit used for an uplink control channel in an IEEE 802.16m system.
7 shows an example of a resource block of a PUSC region based on the FDM scheme in the legacy support mode.
8 illustrates an uplink channel signal transmission method according to an embodiment of the present invention.
9 shows an example of an uplink control channel configuration according to the proposed uplink control signal transmission method.
10 to 11 illustrate another example of uplink control channel configuration according to the proposed uplink control signal transmission method.
12 is a block diagram illustrating a transmitter and a receiver in which an embodiment of the present invention is implemented.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various wireless communication systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), or 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 part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using Evolved-UMTS Terrestrial Radio Access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted. LTE-A (Advanced) is the evolution of 3GPP LTE.

For clarity, the following description focuses on IEEE 802.16m, but the technical spirit of the present invention is not limited thereto.

1 illustrates 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 for a particular geographic area (generally called a cell) 15a, 15b, 15c. The cell may again be divided into multiple regions (referred to as sectors). The UE 12 may be fixed or mobile, and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a PDA ( Other terms may be referred to as a personal digital assistant, a wireless modem, a handheld device, etc. The base station 11 generally refers to a fixed station that communicates with the terminal 12. It may be called other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.

The UE belongs to one cell, and the cell to which the UE belongs is called a serving cell. A base station that provides a communication service for a serving cell is called a 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 called a neighbor cell. A base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.

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

2 shows an example of a frame structure.

Referring to FIG. 2, a superframe (SF) includes a superframe header (SFH) and four frames (frames, F0, F1, F2, and F3). Each frame in the superframe may have the same length. The size of each superframe is 20ms and the size of each frame is illustrated as 5ms, but is not limited thereto. The length of the superframe, the number of frames included in the superframe, the number of subframes included in the frame, and the like may be variously changed. The number of subframes included in the frame may be variously changed according to a channel bandwidth and a length of a cyclic prefix (CP).

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

A time division duplexing (TDD) scheme or a frequency division duplexing (FDD) scheme may 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, subframes in a frame of the TDD scheme are classified 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 frame of the FDD scheme are divided into an uplink subframe and a downlink subframe in the frequency domain. Uplink transmission and downlink transmission occupy different frequency bands and may be simultaneously performed.

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

 Logical Resource Units (LRUs) are basic logical units for distributed resource allocation and contiguous resource allocation. The LRU is defined by a plurality of OFDM symbols and a plurality of subcarriers and includes pilots used in a PRU. Thus, the appropriate number of subcarriers in one LRU depends on the number of pilots assigned.

Distributed Logical Resource Units (DLRUs) may be used to obtain frequency diversity gain. The DLRU includes subcarrier groups distributed in resource regions within one frequency partition. The size of the DLRU is equal to the size of the PRU. The minimum unit forming the DLRU may be a tile.

Contiguous Logical Resource Units (CLRUs) may be used to obtain frequency selective scheduling gains. The CLRU includes contiguous subcarrier groups in the resource domain. The size of the CLRU is equal to the size of the PRU.

3 shows another example of a frame structure. The frame structure of FIG. 3 shows a TDD frame structure in a legacy support mode supporting not only an 802.16m terminal but also an 802.16e terminal.

Referring to FIG. 3, the frame includes a downlink (DL) subframe and an uplink (UL) subframe. The downlink subframe is temporally ahead of the uplink subframe. The downlink subframe starts with a preamble, a frame control header (FCH), a downlink (DL) -MAP, an uplink (MAP) -MAP, and a burst region. The uplink subframe includes an uplink control channel such as a ranging channel and a feedback channel, a burst region, and the like. A guard time for distinguishing the downlink subframe and the uplink subframe is inserted in the middle part (between the downlink subframe and the uplink subframe) and the last part (after the uplink subframe) of the frame. Transmit / Receive Transition Gap (TGT) is a gap between a downlink burst and a subsequent uplink burst. Receive / Transmit Transition Gap (RTG) is a gap between an uplink burst and a subsequent downlink burst. The downlink region and the uplink region are divided into an area for an 802.16e terminal and an area for an 802.16m terminal. In the downlink region, the preamble, the FCH, the DL-MAP, the UL-MAP, and the downlink burst region are regions for the 802.16e terminal, and the remaining downlink regions are regions for the 802.16m terminal. In the uplink region, the uplink control channel and the uplink burst region are regions for the 802.16e terminal, and the remaining uplink regions are the regions for the 802.16m terminal. In the uplink region, the region for the 802.16e terminal and the region for the 802.16m terminal may be multiplexed in various ways. In FIG. 3, the uplink region is multiplexed by the TDM scheme, but is not limited thereto. The uplink region may be multiplexed by the FDM scheme.

The preamble is used for initial synchronization, cell search, frequency offset, and channel estimation between the base station and the terminal. The FCH includes the length of the DL-MAP message and the coding scheme information of the DL-MAP.

DL-MAP is an area where a DL-MAP message is transmitted. The DL-MAP message defines access to the downlink channel. This means that the DL-MAP message defines the indication and / or control information for the downlink channel. The DL-MAP message includes a configuration change count of the downlink channel descriptor (DDC) and a base station identifier (ID). DCD describes a downlink burst profile applied to the current map. The downlink burst profile refers to a characteristic of a downlink physical channel, and the DCD is periodically transmitted by the base station through a DCD message.

The UL-MAP is an area in which the UL-MAP message is transmitted. The UL-MAP message defines a connection to an uplink channel. This means that the UL-MAP message defines the indication and / or control information for the uplink channel. The UL-MAP message includes a configuration change count of an uplink channel descriptor (UCD) and an allocation start time of uplink allocation defined by UL-MAP. UCD describes an uplink burst profile. The uplink burst profile refers to characteristics of an uplink physical channel, and the UCD is periodically transmitted by the base station through a UCD message.

The downlink burst is an area in which data transmitted from the base station to the terminal is transmitted, and the uplink burst is an area in which data transmitted from the base station to the terminal is transmitted.

The fast feedback region is included in an uplink burst region of an OFDM frame. The fast feedback area is used for transmission of information requiring a fast response from the base station. The fast feedback region may be used for CQI transmission. The position of the fast feedback region is determined by UL-MAP. The position of the fast feedback region may be a fixed position within the OFDM frame or may be a variable position.

The SFH may carry essential system parameters and system configuration information. The SFH may be located in the first subframe in the superframe. SFH may occupy the last five OFDM symbols of the first subframe. The superframe header may be classified into primary SFH (P-SFH) and secondary SFH (S-SFH; secondary-SFH). P-SFH and S-SFH may be transmitted every superframe. S-SFH may be transmitted in two consecutive superframes. S-SFH can be classified into S-SFH SP1, S-SFH SP2 and S-SFH SP3 according to the importance of information to be transmitted. S-SFH SP1 provides information about the number of HARQ feedback channels and ranging channels of uplink control channels, resource mapping information such as subband partitioning and frequency partitioning, and support for 802.16e terminals. Legacy support information, and the like. S-SFH SP2 may include uplink bandwidth and resource mapping information. The S-SFH SP3 may include information on a transmission period of the S-SFH, information on a feedback channel and a bandwidth request channel among uplink control channels.

4 shows an example of a transmission period of the S-SFH. S-SFH SP1, SP2, and SP3 may all have different transmission periods. Since the information transmitted by S-SFH SP1 is of the greatest importance, S-SFH SP1 may be transmitted in the shortest period and S-SFH SP3 may be transmitted in the longest period. The transmission period of the S-SFH SP1, SP2 and SP3 may be 40 ms, 80 ms, 160 ms or 320 ms, respectively. The transmission periods of the S-SFH SP1, SP2, and SP3 may be indicated by the SP scheduling periodicity information field of the S-SFH SP3.

5 shows an example of an uplink resource structure.

The uplink subframe may be divided into at least one frequency partition. Here, the subframe is divided into two frequency partitions (FP1, FP2) by way of example, but the number of frequency partitions in the subframe is not limited thereto. Each frequency partition can be used for other purposes, such as FFR.

Each frequency partition consists of at least one PRU. Each frequency partition may include distributed resource allocation and / or contiguous resource allocation. The distributed resource allocation may be a DLRU, and the contiguous resource allocation may be a CLRU. Here, the second frequency partition FP2 includes distributed resource allocation and continuous resource allocation. 'Sc' means a subcarrier.

Hereinafter, a control channel for transmitting a control signal or a feedback signal will be described. The control channel may be used for transmitting various kinds 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, a fast feedback channel, and the like.

6 shows an example of a resource unit used for an uplink control channel in an IEEE 802.16m system. The resource unit 50 is a resource allocation unit used for transmission of an uplink control channel and is also called a tile. The tile 50 may be a physical resource allocation unit or may be a logical resource allocation unit. The control channel comprises at least one tile 50, which is composed of at least one subcarrier in the frequency domain on at least one OFDM symbol in the time domain. The tile 50 refers to a bundle of a plurality of subcarriers adjacent to the time domain and the frequency domain. Tile 50 includes a plurality of data subcarriers and / or pilot subcarriers. A sequence of control signals may be mapped to the data subcarrier, and a pilot for channel estimation may be mapped to the pilot subcarrier.

The tile 50 comprises three mini units 51, 52, 53. Mini units are also called mini tiles. The tile 50 may be composed of a plurality of mini-tiles, and the mini-tiles may be configured of at least one subcarrier in the frequency domain on at least one OFDM symbol in the time domain. Each of the mini-tiles 51, 52, 53 includes two contiguous subcarriers over six Orthogonal Frequency Division Multiplexing (OFDM) symbols. The mini tiles 51, 52, 53 in the tile 50 may not be adjacent to each other in the frequency domain. This means that at least one mini tile of another tile may be disposed between the first mini tile 51 and the second mini tile 52 and / or between the second mini tile 52 and the third mini tile 53. it means. Frequency diversity can be obtained by distributing the mini-tiles 51, 52, 53 in the tile 50 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 mini-tile is merely an example and is not a limitation. The number of OFDM symbols included in the mini-tile may vary depending on the number of OFDM symbols included in the subframe. For example, if the number of OFDM symbols included in one subframe is six, the number of OFDM symbols included in the mini-tile may be six.

An OFDM symbol refers to a duration in the time domain and is not necessarily limited to a system based on OFDM / OFDMA. This may be called another name such as a symbol interval, and the technical concept of the present invention is not limited to a specific multiple access scheme by the name of an OFDM symbol. In addition, a subcarrier refers to an allocation unit in the frequency domain. Here, one subcarrier is used as a unit, but a subcarrier aggregation unit may be used.

7 shows an example of a resource block of a PUSC region based on the FDM scheme in the legacy support mode. Resource block 60 is composed of six tiles. The resource block 60 may be a DLRU. The six tiles 61, 62, 63, 64, 65, and 66 constituting the resource block 60 each include four adjacent subcarriers over six OFDM symbols. The tiles 61, 62, 63, 64, 65, and 66 in the resource block 60 may be distributed to each other by a permutation rule of the 802.16e region in the frequency domain. Frequency diversity can be obtained by distributing the tiles 61, 62, 63, 64, 65, and 66 in the resource block 60 in the frequency domain. The plurality of resource blocks configured as described above are logically aligned in the resource region according to the order indicated by the permutation rule of the 802.16e region, and some of the plurality of resource blocks are used in the 802.16m region and some are used in the 802.16e region. Can be.

 The control channel may be designed in consideration of the following points.

(1) The plurality of tiles included in the control channel may be distributed to the time domain or the frequency domain to obtain frequency diversity gain. For example, given that the DLRU includes three tiles consisting of six consecutive subcarriers on six OFDM symbols, the control channel may include three tiles and each tile may be distributed in the frequency domain or the time domain. have. Alternatively, the control channel may include at least one tile, and the tile may include a plurality of mini tiles so that the plurality of mini tiles may be distributed in a frequency domain or a time domain. For example, the minitile may 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 a control channel including a tile of a PUSC structure of (OFDM symbol × subcarrier) = 3x4 of IEEE 802.16e and a control channel including a mini tile are multiplexed by frequency division multiplexing (FDM), (OFDM symbol × subcarrier) = 6 × 2, 6 × 1 and the like. Considering only the control channel including the mini-tiles, the mini-tiles may consist of (OFDM symbols × subcarriers) = 6 × 2, 3 × 6, 2 × 6, 1 × 6, and the like.

(2) In order to support a high speed terminal, the number of OFDM symbols constituting the control channel should be configured to the minimum. For example, in order to support a terminal moving at 350 km / h, the number of OFDM symbols constituting the control channel is appropriately three or less.

(3) The transmission power per symbol of the terminal is limited, and in order to increase the transmission power per symbol of the terminal, the larger the number of OFDM symbols constituting the control channel is, the more advantageous. Therefore, the number of appropriate OFDM symbols should be determined in consideration of the transmission power per symbol of the fast terminal of (2) and the terminal of (3).

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

(5) For non-coherent detection, the control signal should be composed or spread of orthogonal code / sequence or semi-orthogonal code / sequence.

The uplink control channel includes a fast feedback channel (FFBCH), a HARQ feedback channel (HFBCH), a hybrid automatic repeat request feedback channel (HFBCH), a ranging channel, a bandwidth request channel (BRCH), and the like. It may include.

The FFBCH carries feedback of CQI and / or MIMO information, and may be divided into two types, a primary fast feedback channel (PFBCH) and a secondary fast feedback channel (SFBCH). The PFBCH carries 4 to 6 bits of information and provides wideband CQI and / or MIMO feedback. The SFBCH carries from 24 bits of information and provides narrowband CQI and / or MIMO feedback. SFBCH can support more control information bits using a higher code rate. PFBCH supports non-coherent detection using no pilot, and SFBCH supports coherent detection using pilot. The FFBCH may be assigned to a predetermined location defined in the broadcast message. FFBCH may be allocated to the UE periodically. Feedback information of a plurality of UEs may be multiplexed and transmitted in a time division multiplexing (TDM), frequency division multiplexing (FDM), and code division multiplexing (CDM) scheme through the FFBCH. The fast feedback channel in which the ACK / NACK signal is transmitted in response to the data to which the HARQ technique is applied may start at a predefined offset from the data transmission.

 The HFBCH is a channel for transmitting an ACK (Acknowledgement) / Non-acknowledgement (NACK) signal in response to the data transmission. The ranging channel is a channel used for uplink synchronization. The ranging channel may be divided into a ranging channel for a non-synchronized MS and a ranging channel for a synchronized MS. The BRCH is a channel for requesting radio resources for transmitting uplink data or a control signal to be transmitted by the terminal.

The FFBCH, HFBCH, ranging channel, BRCH, etc. may be located anywhere in an uplink subframe or frame.

In general, in allocating an uplink control channel for transmitting an uplink control signal, it is possible to determine whether to assign an uplink control channel for each FFR region. However, if an uplink control channel is allocated to all FFR regions, signaling overhead may occur in channel allocation. In addition, the frequency partitioning method of downlink and uplink may be different. At this time, confusion may occur in uplink control channel allocation. 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, BRCH that does not need to have a large number of channels enough to be allocated to all FFR regions and cannot perform power control can be allocated to only one FFR region. In addition, FFBCH, HFBCH, and the like, which can control power, may be allocated to all FFR regions, or may be determined for each region.

A plurality of uplink control channels may be allocated to the DLRU of each uplink frequency partition. The plurality of uplink control channels may include a feedback channel, a bandwidth request channel, and the like. The feedback channel may include a fast feedback channel and an HARQ feedback channel. When uplink data and uplink control channel are allocated to an uplink frequency partition, the uplink data partition may be allocated in the order of HARQ feedback channel, fast feedback channel, bandwidth request channel, and uplink data. The configuration of the uplink control channel can be applied to both 16m only mode and legacy support.

Meanwhile, the ranging channel of the uplink control channel in the 16m only mode may be allocated to the CLRU. In the legacy support mode, the ranging channel may be allocated to the DLRU. Therefore, when configuring the uplink control channel in the legacy support mode, a method of configuring an uplink control channel including a ranging channel is required.

8 illustrates an uplink channel signal transmission method according to an embodiment of the present invention.

In step S100, the base station transmits the resource allocation information of the ranging channel to the terminal. In step S110, the base station transmits resource allocation information of the feedback channel and the bandwidth request channel to the terminal. In step S120, uplink resources are allocated to the ranging channel, the feedback channel, and the bandwidth request channel according to the resource allocation information of the ranging channel and the resource allocation information of the feedback channel and the bandwidth request channel. In step S130, the terminal transmits the ranging channel, feedback channel and bandwidth request channel.

Since the ranging channel is a channel for initial access of the terminal, the terminal needs to receive and read information about the ranging channel as soon as possible. Therefore, the resource allocation information of the ranging channel may be transmitted through the S-SFH SP1 transmitted in the smallest period among the S-SFH. The feedback channel may include a fast feedback channel and an HARQ feedback channel. Since the feedback channel and the bandwidth request channel do not change frequently and need to be received and read faster than the ranging channel, the resource allocation information of the feedback channel and the bandwidth request channel is transmitted in the longest period of the S-SFH SP3. Can be sent through.

In addition, the position on the resource region of the ranging channel should allow the terminal to receive the S-SFH SP1 and know its position immediately regardless of other control channels or data regions. That is, the ranging channel may function as a reference uplink control channel in allocating uplink resources to the uplink control channel. Uplink resources may be allocated to the ranging channel first, and then adjacent uplink resources may be allocated to other control channels such as a feedback channel and a bandwidth request channel. In the 802.16m region, the uplink resource may be a DLRU.

9 shows an example of an uplink control channel configuration according to the proposed uplink control signal transmission method. The ranging channel is allocated from the first DLRU of the uplink resources of the legacy support mode, and then the DLRU is allocated to the feedback channel, the bandwidth request channel, and the data region in order of increasing index. Each control channel may be adjacent to each other on a logical resource zone.

10 shows another example of an uplink control channel configuration according to the proposed uplink control signal transmission method. The ranging channel is allocated from the last DLRU of the uplink resources of the legacy support mode, and then the DLRU is allocated to the feedback channel, the bandwidth request channel, and the data region in order of decreasing index. Each control channel may be adjacent to each other on a logical resource zone.

In the uplink control channel configuration of FIGS. 9 and 10, the 802.16e region and the 802.16m region are multiplexed with each other by the FDM scheme in the uplink subframe, and when the boundary is transmitted by the S-SFH SP1, the terminal is 802.16e. Regardless of the configuration of the zone, the first or last DLRU can be found. In addition, even if the boundary is not transmitted or transmitted but not transmitted by the S-SFH SP1, the uplink control channel should be arranged so that the UE knows the first or last DLRU regardless of the configuration of the 802.16e region. That is, since the 802.16m UEs know the permutation rules of the 802.16e region, the first or last subchannel of the 802.16e region is mapped to the first or last DLRU of the 802.16m region so that uplink without information on the boundary is possible. The location of the control channel can be known.

11 shows another example of an uplink control channel configuration according to the proposed uplink control signal transmission method. The example of FIG. 11 may be applied when the terminal knows allocation information of an uplink control channel of 802.16e.

The smaller portion of the subchannel index in the uplink resource region is used as the 802.16e region. The first three OFDM symbols are used as an uplink control channel of 802.16e. It is used as an area for 802.16e data and 802.16m data except for an uplink control channel allocated portion of the 802.16e area. As shown in FIG. 11, an empty area in which nothing is transmitted may exist. This is because 802.16m data is allocated in units of subframes. The empty area may be used for transmission of 802.16e data.

The uplink control channel of 802.16m may be allocated so that the uplink control channel of 802.16e and the ranging channel of 802.16m do not overlap with the allocated resource region. The uplink control channel of 802.16m may be allocated after the DLRU index to which the uplink control channel of 802.16e is allocated. This is because the uplink control channel of the 802.16e includes three OFDM symbols, and it is difficult to schedule the remaining resource region except for the three OFDM symbols as the region for the uplink control channel of the 802.16m. The location of the uplink control channel of 802.16m may be transmitted by broadcast information. The broadcast information may be transmitted through SFH. The broadcast information may include at least one of a starting point on a resource region of each uplink control channel, a size or an order on the resource region. If the size or order on the resource region of each uplink control channel is the same as in the 16m only mode, the broadcast information may include only starting point information on the resource region of each uplink control channel. In the case of the ranging channel of 802.16m, when the boundary information is not informed by the SFH SP1, the ranging channel may be fixed to the position of the DLRU corresponding to the last subchannel. Alternatively, the position of the uplink control channel of 802.16m may be fixed. For example, the position of the 802.16m uplink control channel may be fixed based on the position of the ranging channel of 802.16m and the position of the data region. When the ranging channel is allocated in order of decreasing index from the last DLRU, an uplink control channel of 802.16m may be allocated in a direction in which the index of the DLRU decreases after the ranging channel.

12 is a block diagram illustrating a transmitter and a receiver in which an embodiment of the present invention is implemented.

Transmitter 200 includes a processor 210 and transmit circuitry 220. The processor 210 implements the proposed functions, processes and / or methods. The processor generates allocation information of the ranging channel, allocation information of the feedback channel, and allocation information of the bandwidth request channel. The transmitting circuit 220 transmits allocation information of the ranging channel, allocation information of the feedback channel, and allocation information of the bandwidth request channel, and transmits and / or receives a radio signal.

The receiver 300 includes a processor 310 and a receiving circuit 320. The receiving circuit 320 receives allocation information of the ranging channel, allocation information of the feedback channel, and allocation information of the bandwidth request channel transmitted from the transmitter, and transmits the ranging channel, the feedback channel, and the bandwidth request channel. do. The processor 320 configures the ranging channel, the feedback channel, and the bandwidth request channel in an uplink resource region based on the allocation information of the ranging channel, the allocation information of the feedback channel, and the allocation information of the bandwidth request channel. do.

The present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof. In the software implementation, the module may be implemented as a module that performs the above-described function. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

Claims (15)

In the uplink control channel transmission method in a wireless communication system,
Receive resource allocation information of the first uplink control channel for transmitting the uplink synchronization signal,
Receiving resource allocation information of a second uplink control channel,
A first uplink control channel resource for each of the first uplink control channel and the second uplink control channel based on the resource allocation information of the first uplink control channel and the resource allocation information of the second uplink control channel; Allocates a second uplink control channel resource,
Transmitting the first uplink control channel and the second uplink control channel to a base station;
The first uplink control channel resource is located in a first resource unit of a plurality of resource units constituting a logical resource region,
And in the logical resource region, the first uplink control channel resource and the second uplink control channel resource. The method of claim 1,
The index of the second uplink control channel resource is larger than the index of the first uplink control channel resource. The method of claim 1,
The second uplink control channel includes a feedback channel for transmitting uplink feedback and a bandwidth request channel for transmitting a bandwidth request signal (BRCH).
And an index of a resource allocated to the feedback channel in the logical resource region is smaller than an index of a resource allocated to the bandwidth request channel. The method of claim 2,
The feedback channel includes a HARQ Feedback Channel (HFBCH) for transmitting Hybrid Automatic Request reQuest (HARQ) feedback and a Fast Feedback Channel (FFBCH) for transmitting Channel Quality Indicator (CQI) or MIMO information. and,
And an index of a resource allocated to the HARQ feedback channel in the logical resource region is smaller than an index of a resource allocated to the fast feedback channel. The method of claim 1,
The resource allocation information of the first uplink control channel and the resource allocation information of the second uplink control channel are broadcast. The method of claim 1,
The resource allocation information of the first uplink control channel is transmitted every 40 ms. The method of claim 1,
Resource allocation information of the second uplink control channel is characterized in that the transmission of any one of 160 ms or 320 ms. The method of claim 1,
Each resource unit includes six tiles,
Wherein the tiles each comprise four consecutive subcarriers and six Orthogonal Frequency Division Multiplexing (OFDM) symbols. The method of claim 1,
Allocates an uplink data region to a logical resource region remaining after the first uplink control channel resource and the second uplink control channel resource are allocated;
Transmitting uplink data mapped to the uplink data region to a base station. An apparatus for transmitting an uplink control channel in a wireless communication system,
A receiving circuit for receiving allocation information of a first uplink control channel and allocation information of a second uplink control channel from a base station and transmitting the first uplink control channel and the second uplink control channel; And
The first uplink control channel and the second uplink control channel are respectively connected to the receiving circuit based on the resource allocation information of the first uplink control channel and the resource allocation information of the second uplink control channel. A processor for allocating one uplink control channel resource and a second uplink control channel resource,
The first uplink control channel resource is located in a first resource unit of a plurality of resource units constituting a logical resource region,
And assigning the first uplink control channel resource to the second uplink control channel resource in the logical resource region. The method of claim 10,
And the index of the second uplink control channel resource is greater than the index of the first uplink control channel resource. The method of claim 10,
The second uplink control channel includes a feedback channel for transmitting uplink feedback and a bandwidth request channel for transmitting a bandwidth request signal (BRCH).
And an index of a resource allocated to the feedback channel in the logical resource region is smaller than an index of a resource allocated to the bandwidth request channel. The method of claim 10,
The feedback channel includes a HARQ Feedback Channel (HFBCH) for transmitting Hybrid Automatic Request reQuest (HARQ) feedback and a Fast Feedback Channel (FFBCH) for transmitting Channel Quality Indicator (CQI) or MIMO information. and,
And an index of a resource allocated to the HARQ feedback channel in the logical resource region is smaller than an index of a resource allocated to the fast feedback channel. The method of claim 10,
And resource allocation information of the first uplink control channel and the resource allocation information of the second uplink control channel are broadcast. The method of claim 10,
Each resource unit includes six tiles,
Wherein the tiles each comprise four consecutive subcarriers and six Orthogonal Frequency Division Multiplexing (OFDM) symbols.

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