CN102308503B - Method and apparatus for constructing uplink control channel in wireless communication system - Google Patents

Abstract

The present invention provides a method and apparatus for constructing an uplink control channel in a wireless communication system. An uplink radio resource comprising multiple symbols and multiple subcarriers is divided into multiple feedback microtiles (FMTs), each of which has two consecutive subcarriers. A reordering FMT (RFMT) is selected from the multiple FMTs. The multiple consecutive RFMTs are used to construct a feedback channel.

Description

Method and apparatus for constructing uplink control channel in wireless communication system

technical field

The present invention relates to wireless communications, and more particularly to methods and apparatus for constructing uplink control channels in wireless communications systems.

Background technique

In 2007, the Institute of Electronics and Electrical Engineers (IEEE) 802.16e standard was adopted by the ITU Radiocommunication Sector (ITU-R), a division of the International Telecommunication Union (ITU), as the sixth standard for International Mobile Telecommunications (IMT)-2000 , named "WMAN-OFDMA TDD". ITU-R has prepared an IMT-advanced (IMT-advanced) system as a next-generation (ie, fourth-generation) mobile communication standard after IMT-2000. The IEEE 802.16 Working Group (WG) decided to proceed with the 802.16m project with the aim of creating a modified standard to the existing IEEE 802.16e as a standard for IMT-Advanced Systems. From the above purpose, it can be seen that the 802.16m standard has two aspects, namely, continuity for the past (i.e., modification of the existing 802.16e standard) and continuity for the future (i.e., for the next generation of IMT-advanced systems standards). Therefore, the 802.16m standard needs to satisfy all requirements of the IMT-Advanced system while maintaining compatibility with the mobile WiMAX system conforming to the 802.16e standard.

An Orthogonal Frequency Division Multiplexing (OFDM) system capable of reducing Inter-Symbol Interference (ISI) with lower complexity is considered as one of next-generation wireless communication systems. The OFDM system converts serially input data symbols into N parallel data symbols, and then sends N data symbols on N subcarriers respectively. These subcarriers maintain orthogonality in the frequency domain. Each orthogonal channel experiences frequency selective fading independently of each other, and the space between the transmitted symbols is increased, so that the ISI effect is minimized. Among systems using OFDM as a modulation scheme, Orthogonal Frequency Division Multiple Access (OFDMA) is a multiple access scheme that achieves multiple access by individually providing some of available subcarriers to multiple users. In the OFDMA method, frequency resources (referred to as subcarriers) are provided to individual users, and are usually provided individually to a plurality of users. Therefore, these frequency resources provided to multiple users generally do not overlap each other. Therefore, frequency resources are allocated to each user in an exclusive manner.

In an OFDMA system, frequency selective scheduling can be used to obtain frequency diversity for multiple users, and subcarriers can be allocated in different ways according to permutation criteria for subcarriers. In addition, a spatial multiplexing scheme employing multiple antennas can be applied to improve efficiency in the spatial domain.

In order to obtain frequency diversity when transmitting an uplink control signal, a method of efficiently constructing an uplink control channel is required.

Contents of the invention

technical problem

The present invention provides a method and apparatus for constructing an uplink control channel in a wireless communication system.

Technical solutions

In one aspect, a method of constructing an uplink control channel in a wireless communication system is provided. The method comprises the steps of: dividing an uplink radio resource comprising a plurality of symbols and a plurality of subcarriers into a plurality of feedback microchips (FMTs), each feedback microchip having two consecutive subcarriers; from the plurality of FMTs selecting a reordered FMT (RFMT); and constructing a feedback channel by using successive said plurality of RFMTs. The method may further comprise the steps of: dividing each of the RFMTs constituting the feedback channel into a plurality of HRAQ micro-tiles (HMTs); selecting a reordered HARQ micro-tile (RHMT) from the plurality of HMTs; and by A HARQ feedback channel is constructed using the consecutive plurality of RHMTSs.

In another aspect, a transmitter in a wireless communication system is provided. The transmitter includes: a radio frequency (RF) unit configured to transmit or receive wireless signals; and a processor connected to the RF unit and configured to perform the following operations: The uplink radio resource of is divided into a plurality of feedback microtiles (FMT), and each feedback microchip has two successive subcarriers; Select reordering FMT (RFMT) from described plurality of FMTs; And by using successive described Multiple RFMTs are used to construct the feedback channel. The processor may also be configured to perform the following operations: divide each of the RFMTs constituting the feedback channel into a plurality of HRAQ microchips (HMT); select a reordered HARQ microchip (RHMT) from the plurality of HMTs; ); and constructing a HARQ feedback channel by using the successive RHMTSs.

beneficial effect

According to the present invention, frequency diversity can be obtained by constructing a feedback channel using distributed radio resources.

Description of drawings

FIG. 1 is a diagram showing a wireless communication system.

FIG. 2 is a diagram showing an example of a frame structure.

FIG. 3 is a diagram showing an embodiment of resource elements used in an uplink control channel.

FIG. 4 is a diagram illustrating an example of a method for constructing an uplink control channel according to an embodiment of the present invention.

Fig. 5 is a diagram illustrating an embodiment of constructing a feedback channel according to the method proposed by the present invention.

Fig. 6 is a diagram illustrating another embodiment of constructing a feedback channel according to the method proposed by the present invention.

FIG. 7 is a diagram illustrating another example of a method for configuring an uplink control channel according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating an embodiment of constructing a HARQ feedback channel according to the method proposed in the present invention.

FIG. 9 is a diagram illustrating another embodiment of constructing a HARQ feedback channel according to the method proposed in the present invention.

Figure 10 is a block diagram of user equipment implementing various embodiments of the present invention.

Detailed ways

The following techniques can be used in various wireless communication systems, such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA). CDMA can be implemented using a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented using a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data rates for GSM Evolution (EDGE). OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20 or Evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e, and it provides backward compatibility to IEEE 802.16e-based systems. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA), and 3GPP LTE is in the downlink (DL ) adopts OFDMA, and adopts SC-FDMA in the uplink (UL). LTE-A (Advanced) is an evolution of 3GPP LTE.

For ease of description, IEEE 802.16m is mainly used as an example for illustration, but the technical idea of the present invention is not limited to IEEE 802.16m.

IEEE 802.16m is mainly described as one embodiment for clarity of description, but the technical spirit of the present invention is not limited to IEEE 802.16m.

Figure 1 shows a wireless communication system.

The wireless communication system 10 includes one or more base stations (BS) 11 . BS 11 provides communication services for various geographical areas (commonly referred to as "cells") 15a, 15b and 15c. Each cell can be divided into a number of areas (called "sectors"). User Equipment (UE) 12 may be fixed or mobile and may be referred to using other terms such as Mobile Station (MS), Mobile Terminal (MT), User Terminal (UT), Subscriber Station (SS), wireless device, Personal Digital Assistant (PDA), wireless modem, or handheld device. In general, BS 11 refers to a fixed station that communicates with UE 12 and may be denoted using other terms such as evolved Node B (eNB), base transceiver system (BTS) or access point.

UE belongs to one cell. The cell to which the UE belongs is called a serving cell. A BS that provides communication services for a serving cell is called a serving BS. The wireless communication system is a cellular system, thus the wireless communication system includes other cells adjacent to the serving cell. Other cells adjacent to the serving cell are called neighboring cells. BSs that provide communication services for neighboring cells are referred to as neighboring BSs. The serving cell and the neighboring cell are relatively determined based on the UE.

This technique can be used for downlink (DL) or uplink (UL). In general, DL refers to communication from BS 11 to UE 12, while UL refers to communication from UE 12 to BS 11. In DL, the transmitter can be part of the BS 11 and the receiver can be part of the UE 12. In UL, the transmitter may be part of UE 12 and the receiver may be part of BS 11.

Figure 2 shows an example of a frame structure.

Referring to FIG. 2, a super frame (SF) includes a super frame header (SFH) and four frames F0, F1, F2 and F3. In SF, each frame can have the same length. Although it is shown that each SF has a length of 20 milliseconds (ms), and each frame has a length of 5 ms, the present invention is not limited thereto. The length of the SF, the number of frames included in the SF, the number of SFs included in a frame, and the like can be variously changed. The number of SFs included in a frame can be variously changed according to channel bandwidth and cyclic prefix (CP) length.

The SFH can carry key system parameters and system configuration information. SFH may be located in the first subframe of SF. The SFH can be divided into a primary SFH (P-SFH) and a secondary SFH (S-SFH). P-SFH and S-SFH can be transmitted in every superframe.

One frame includes 8 subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6 and SF7. Each subframe can be used for uplink transmission or downlink transmission. One subframe includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain and a plurality of subcarriers in a frequency domain. One OFDM symbol is used to represent one symbol period, and may be represented using other terms (eg, OFDM symbol, SC-FDMA symbol, etc.) according to a multiple access scheme. A subframe can consist of 5, 6, 7 or 9 OFDM symbols. However, this is for exemplary purposes only, and thus, the number of OFDM symbols included in a subframe is not limited thereto. The number of OFDM symbols included in a subframe can be variously changed according to channel bandwidth and CP length. The subframe type may be defined according to the number of OFDM symbols included in the subframe. For example, it may be defined as follows: a type 1 subframe includes 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 may include a plurality of subframes each having the same type. Alternatively, one frame may include a plurality of subframes each having a different type. That is, in one frame, the number of OFDM symbols included in each subframe may be the same or different. Alternatively, the number of OFDM symbols included in at least one subframe of a frame may be different from the number of OFDM symbols of the remaining subframes in the frame.

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

One subframe includes a plurality of physical resource units (PRUs) in the frequency domain. A PRU is a basic physical unit for resource allocation and consists of a number of consecutive OFDM symbols in the time domain and a number of consecutive subcarriers 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. Therefore, the number of OFDM symbols in a PRU can be determined according to the subframe type. For example, when a subframe consists of 6 OFDM symbols, 18 subcarriers and 6 OFDM symbols may be used to define a PRU.

A Logical Resource Unit (LRU) is a basic logical unit for distributed resource allocation and continuous resource allocation. An LRU is defined by a plurality of OFDM symbols and a plurality of subcarriers, and the LRU includes pilots used in the PRU. Therefore, the desired number of subcarriers for one LRU depends on the number of allocated pilots.

Distributed resource units (DRUs) can be used to obtain frequency diversity gain. The DRU includes dispersed subcarrier groups in one frequency partition. A DRU has the same dimensions as a PRU. A subcarrier is a basic unit of a DRU. Distributed Logical Resource Units (DLRUs) can be obtained by performing subcarrier permutation on DRUs.

Contiguous resource units (CRUs) can be used to obtain frequency selective scheduling gain. A CRU includes a localized set of subcarriers. A CRU has the same dimensions as a PRU. Contiguous Logical Resource Units (CLRUs) can be obtained by directly mapping CRUs.

Consider the following points to design the control channel.

(1) A plurality of tiles included in a control channel can be distributed in time domain or frequency domain to obtain frequency diversity gain. For example, assuming that the DRU includes 3 tiles, and each tile includes 6 consecutive subcarriers on 6 OFDM symbols, the control channel includes 3 tiles, and each tile can be distributed in the frequency domain or the time domain. In some embodiments, the control channel may include at least one tile, the at least one tile includes a plurality of micro-tiles, and the plurality of micro-tiles may be distributed in the frequency domain or the time domain. For example, a micro-tile may include (OFDM symbols x subcarriers) = 6x6, 3x6, 2x6, 1x6, 6x3, 6x2, 6x1, and so on. Assuming that the control channel of IEEE 802.16e includes (OFDM symbol × subcarrier) = 3 × 4 PUSC structure slices, and the control channel comprising micro slices is multiplexed by the frequency division multiplexing (FDM) method, then the micro slices can include (OFDM symbol x subcarrier) = 6 x 2, 6 x 1, etc. When only control channels including micro-tiles are considered, the micro-tiles may include (OFDM symbols×subcarriers)=6×2, 3×6, 2×6, 1×6, etc.

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

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

(4) For coherent detection, the pilot subcarriers used for channel estimation must be evenly distributed in the time or frequency domain. Coherent detection methods are used to perform channel estimation using pilots and then find the data located on the data subcarriers. For power boosting of pilot subcarriers, the number of pilots per OFDM symbol of the control channel must be equal to maintain the same transmit power per symbol.

(5) For non-coherent detection, the control signal must consist of orthogonal codes/sequences or quasi-orthogonal codes/sequences, or must be spread.

Examples of uplink control channels used in IEEE 802.16m systems include Fast Feedback Channel (FFBCH), Hybrid Automatic Repeat Request (HARQ) Feedback Control Channel (HFBCH), Sounding Channel, Ranging Channel, Bandwidth Request Channel ( BRCH) and so on. The FFBCH carries feedback of CQI and/or MIMO information, and is divided into two types, ie, Primary Fast Feedback Channel (PFBCH) and Secondary Fast Feedback Channel (SFBCH). PFBCH carries 4 to 6 bits of information and provides wideband CQI and/or MIMO feedback. SFBCH carries 7 to 24 bits of information and provides narrowband CQI and/or MIMO feedback. SFBCH can support a larger number of control information bits by using a higher code rate. PFBCH supports non-coherent detection without using a reference signal. SFBCH supports coherent detection using a reference signal.

The FFBCH can be assigned to predetermined locations defined in the broadcast message. The FFBCH may be periodically assigned to MSs on a regular basis. Feedback information of a plurality of MSs may be transmitted via the FFBCH by performing multiplexing according to Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), and Code Division Multiplexing (CDM). The FFBCH may start at a predetermined offset from data transmission, wherein an ACK/NACK signal is transmitted via the FFBCH in response to data to which the HARQ scheme is applied.

The BRCH is a channel that requests radio resources for transmitting uplink data or control signals to be transmitted by mobile stations. The HARQ feedback channel is a channel for transmitting an ACK/NACK signal in response to data transmission. FFBCH, BRCH, HARQ feedback channel, etc. can be set in any position of the uplink subframe or frame.

FIG. 3 shows an embodiment of a resource element used for an uplink control channel in an IEEE 802.16m system. A resource unit 100 is a resource allocation unit for transmission of an uplink control channel, and is also called a slice. The slice 100 may be a physical resource allocation unit or a logical resource allocation unit. The control channel includes at least one tile 100, and the tile 100 consists of at least one time-domain OFDM symbol and at least one frequency-domain subcarrier. Slice 100 represents an aggregation of multiple subcarriers contiguous along the time and frequency domains. Tile 100 includes a plurality of data subcarriers and/or pilot subcarriers. Sequences of control signals may be mapped to data subcarriers, and pilots used for channel estimation may be mapped to pilot subcarriers.

Slice 100 includes three microcells 110 , 120 and 130 . Microcells are also called microchips. Sheet 100 may consist of multiple microchips. A micro-tile may consist of at least one time-domain OFDM symbol and at least one frequency-domain subcarrier. Each of the micro-tiles 110, 120, and 130 includes 2 contiguous subcarriers over 6 OFDM symbols. The micro-tiles 110, 120, and 130 included in the tile 100 may not be continuous with each other in the frequency domain. This means that at least one microchip of another piece may be located between the first microchip 110 and the second microchip 120 , and/or between the second microchip 120 and the third microchip 130 . Frequency diversity can be obtained by arranging the micro-tiles 110, 120, and 130 included in the chip 100 in a dispersed manner.

The number of time-domain OFDM symbols and/or the number of frequency-domain subcarriers included in a micro-tile is for example purposes only, and thus the present invention is not limited thereto. A micro-tile may include multiple subcarriers over multiple OFDM symbols. The number of OFDM symbols included in a micro-tile may differ according to the number of OFDM symbols included in a subframe. For example, if the number of OFDM symbols included in one subframe is 6, the number of OFDM symbols included in a micro-tile may be 6.

OFDM symbols represent durations in the time domain and are not necessarily limited to OFDM/OFDMA based systems. OFDM symbols can also be expressed using other terms, such as symbol duration. The technical features of the present invention are not limited to a specific multiple access scheme due to the term OFDM symbol. In addition, a subcarrier represents an allocation unit in the frequency domain. Although one subcarrier is used for this unit herein, subcarrier group units may be used.

The resource elements of FIG. 3 may be used as resource elements of the feedback channel. That is, the feedback channel may include 3 flits, each flit having a size of 2x6. Furthermore, feedback channels can be constructed by allocating DRUs from logical resources. One DRU may include 3 discrete slices, each slice having a size of 6×6. The tile can be divided into 3 adjacent tiles, each tile having a size of 2x6. A micro-tile may be referred to as a feedback micro-tile (FMT) since it is a resource unit used in the feedback channel.

In addition, the 3 FMTs constituting the feedback channel need to be dispersed in the frequency domain to obtain frequency diversity. Therefore, the FMTs located in one slice and scattered on the DRU cannot be allocated as the resources of the feedback channel, but the feedback channel must be constructed by combining FMTs in different slices. In other words, feedback channels must be allocated by changing the order of FMTs within the DRU.

A method of constructing an uplink control channel according to some embodiments of the present invention is described below.

FIG. 4 is a diagram illustrating a method for constructing an uplink control channel according to one embodiment of the present invention.

In step S200, uplink radio resources are divided into a plurality of FMTs. Uplink radio resources may include at least one DRU. One DRU includes three dispersed slices, each slice having a size of 6×6. The tile includes 3 adjacent FMTs, each adjacent FMT having a size of 2x6. The FMT may be indexed sequentially from the front of the radio resource.

In step S210, a reordered FMT (RFMT) is selected from a plurality of FMTs. The RFMT refers to an FMT obtained by changing the index of the indexed FMT and then indexing the FMT again.

In step S220, the 3 adjacent RFMTs selected from the RFMTs are used to construct a feedback channel.

In step S230, the feedback message is transmitted through the constituted feedback channel.

Fig. 5 is a diagram illustrating an embodiment of constructing a feedback channel according to the method proposed by the present invention. This implementation manner can be used to construct a feedback channel that only uses the Mzone mode of the 802.16m system. The RFMT constituting the feedback channel can be determined according to Equation 1 below.

Mathematical formula 1

In Equation 1, RFMT(s, n) (where n is one of 0, 1, and 2) indicates an n-th FMT of an s-th feedback channel selected from a plurality of feedback channels.

指示了小于或等于“s”除以3所得数的最大整数。mod(s，3)指示了“s”除以3所得余数。也就是说，根据式1，可以通过对从组成一个DRU的三个分散的片中分别选择的3个FMT的组合，来构造一个反馈信道。

The largest integer less than or equal to the number obtained by dividing "s" by 3 is indicated. mod(s, 3) indicates the remainder obtained by dividing "s" by 3. That is to say, according to Equation 1, a feedback channel can be constructed by combining three FMTs respectively selected from three dispersed slices constituting one DRU.

Fig. 6 is a diagram illustrating another embodiment of constructing a feedback channel according to the method proposed by the present invention. This implementation manner can be used to construct a feedback channel in Lzone mode, wherein the FDM method is applied to the 802.16m system and the 802.16e system, and partial utilization of sub-channels (PUSC) is used. The RFMT constituting the feedback channel can be determined according to Equation 2 below.

Mathematical formula 2

In Equation 2, RFMT(s, n) (where n is one of 0, 1, and 2) indicates an n-th FMT of an s-th feedback channel selected from a plurality of feedback channels.

Indicates the largest integer less than or equal to the number obtained by dividing "s" by 2. mod(s, 2) indicates the remainder obtained by dividing "s" by 2. That is to say, according to Equation 2, a feedback channel can be constructed by combining 3 FMTs respectively selected from 6 dispersed slices constituting a DRU.

Meanwhile, a HARQ feedback channel for transmitting Hybrid Automatic Repeat Request (HARQ) may be transmitted by allocating FMT. One feedback channel can be used to transmit 6 HARQ feedback channels, and the radio resources of the feedback channels constructed according to the proposed method can be used. The HARQ feedback channel may be located after the bandwidth request channel on radio resources.

FIG. 7 is a diagram illustrating another example of a method for configuring an uplink control channel according to an embodiment of the present invention.

In step S310, the feedback channel formed by 3 RFMTs is divided into 3 HARQ chips. Since the size of one RFMT is 2×6, the size of one HARQ microchip is 2×2. The HARQ flits may be sequentially indexed from the front of the radio resource, or may be indexed per RFMT.

In step S320, a reordered HARQ flit (RHMT) is selected from a plurality of HARQ flits. RHMT refers to FMT obtained by changing the index of the indexed HARQ flit and then indexing the HARQ flit again.

In step S330, a HARQ feedback channel is constructed using 3 adjacent reordered HARQ flits selected from the reordered HARQ flits.

In step S340, the HARQ feedback message is sent through the formed HARQ feedback channel.

FIG. 8 is a diagram illustrating an embodiment of constructing a HARQ feedback channel according to the method proposed in the present invention. This implementation manner can be used in the case where two HARQ feedback channels are code division multiplexed (CDM) in a 2×2 HARQ chip. The reordered HARQ flits constituting the HARQ feedback channel can be determined according to Equation 3 below.

Mathematical formula 3

In Equation 3, RHMT(k, m) (where m is one of 0, 1, and 2) indicates an m-th HARQ flit of a k-th HARQ feedback channel selected from a plurality of HARQ feedback channels.

并且

指示了小于或等于“k”除以2所得商的最大整数。

指示了小于或等于k除以3所得商的最大整数。mod(k+m，3)指示了(k+m)除以3所得余数。也就是说，根据式3，可以通过对从分配用于HARQ反馈的重新排序反馈微片中选择的3个HARQ反馈微片的组合，来构造一个HARQ反馈信道。

and

The largest integer less than or equal to the quotient of "k" divided by 2 is indicated.

The largest integer less than or equal to the quotient of k divided by 3 is indicated. mod(k+m,3) indicates the remainder obtained by dividing (k+m) by 3. That is to say, according to Equation 3, a HARQ feedback channel can be constructed by combining 3 HARQ feedback flits selected from the reordered feedback flits allocated for HARQ feedback.

FIG. 9 is a diagram illustrating another embodiment of constructing a HARQ feedback channel according to the method proposed in the present invention. The reordered HARQ flits constituting the HARQ feedback channel can be determined according to Equation 4 below.

Mathematical formula 4

RHMT(n,k)=(n+k)mod M

In Equation 4, RHFMT(n, k) (where n is one of 0, 1, and 2) indicates an n-th HARQ flit of a k-th HARQ feedback channel selected from a plurality of HARQ feedback channels. "(n+k)mod M" indicates the remainder obtained by dividing (n+k) by M. M indicates the number of HARQ feedback channels included in one feedback channel. In other words, one HARQ feedback channel can be constructed by selecting one HARQ flit from each of the 3 RFMTs constituting one feedback channel.

In addition, if the HARQ feedback channel of each user equipment passes through CDM in the HARQ microchip, the same HARQ microchip can be allocated to multiple user equipments. Therefore, it is necessary to indicate their CDM codes or sequences individually in these user equipments.

Figure 10 is a block diagram of user equipment implementing various embodiments of the present invention.

User equipment 900 includes a processor 910 and a radio frequency (RF) unit 920 . The processor 910 is implemented to perform proposed functions, processes and/or methods.

The processor 910 divides uplink radio resources including a plurality of symbols and a plurality of subcarriers into a plurality of FMTs (each FMT has two consecutive subcarriers), selects a reordered RFMT from the plurality of FMTs, and uses a plurality of consecutive RFMTs to construct a feedback channel. The RF unit 920 is connected to the processor 910 and configured to transmit and/or receive wireless signals.

Processor 910 may include an Application Specific Integrated Circuit (ASIC), a dedicated chip, a logic circuit, and/or a data processor. The RF unit 920 may include baseband circuitry for processing wireless signals. In the case of implementing the various embodiments in software, the above methods can be implemented using modules (for example, procedures or functions) that perform the above functions. These modules may be executed by the processor 910 .

In view of the exemplary system presented herein, several methodologies implemented in accordance with the disclosed subject matter are described with reference to several flowcharts. Although the methods are shown and described as a series of steps or blocks for brevity, it is to be understood and understood that since certain steps may be performed in an order different from that described and presented herein or in parallel with other steps, The claimed subject matter is therefore not limited to the order of the steps or blocks described. In addition, those skilled in the art should understand that the steps illustrated in the flowchart are not exclusive, and other steps may be included or one or more steps in the illustrated flowchart may be deleted without affecting the scope and spirit of the present disclosure. .

What has been presented above includes examples of various aspects. It is, of course, not possible to present every conceivable combination of components or methodologies for purposes of describing various aspects, but those skilled in the art will appreciate that various other combinations and permutations are possible. Accordingly, this description is intended to embrace all alternatives, modifications and variations that fall within the spirit and scope of the appended claims.

Claims (11)

1. A method for constructing an uplink control channel in a wireless communication system, the method comprising the following steps: Dividing an uplink radio resource comprising a plurality of symbols and a plurality of subcarriers into a plurality of feedback microchips FMT, each feedback microchip having two consecutive subcarriers; selecting a plurality of reordering FMTs, i.e., RFMTs, from the plurality of FMTs; and A feedback channel is constructed by using consecutive said plurality of RFMTs. 2. The method of claim 1, wherein the RFMT is selected according to: where RFMT(s,n) indicates the nth FMT of the sth feedback channel, where n is one of 0, 1 and 2,

indicates the largest integer less than or equal to the quotient of "s" divided by 3, and mod(s,3) indicates the remainder of "s" divided by 3. 3. The method of claim 1, wherein the RFMT is selected according to:

where RFMT(s,n) indicates the nth FMT of the sth feedback channel, where n is one of 0, 1 and 2,

indicates the largest integer less than or equal to the number obtained by dividing "s" by 2, and mod(s,2) indicates the remainder obtained by dividing "s" by 2. 4. The method according to claim 1, further comprising the steps of: dividing each of said RFMTs constituting said feedback channel into a plurality of HRAQ flits, i.e., HMTs; selecting a reordered HARQ flit, i.e., an RHMT, from the plurality of HMTs; and A HARQ feedback channel is constructed by using the consecutive RHMTs. 5. The method of claim 4, wherein the RHMT is selected according to: RHMT(k,m) indicates the m-th HARQ flit of the k-th HARQ feedback channel, where m is one of 0, 1, and 2, indicates the largest integer less than or equal to the quotient of k divided by 2, and

The largest integer less than or equal to the quotient of k' divided by 3 is indicated. 6. The method of claim 4, wherein the RHMT is selected according to: RHMT(n,k)=(n+k)modM Wherein, RHFMT(n,k) indicates the nth HARQ microchip of the kth HARQ feedback channel, where n is one of 0, 1 and 2, and M indicates the The number of HARQ feedback channels. 7. A transmitter in a wireless communication system, the transmitter comprising: a radio frequency RF unit configured to transmit or receive wireless signals; a processor connected to the RF unit and configured to: Dividing an uplink radio resource comprising a plurality of symbols and a plurality of subcarriers into a plurality of feedback microchips FMT, each feedback microchip having two consecutive subcarriers; selecting a plurality of reordering FMTs, i.e., RFMTs, from the plurality of FMTs; and A feedback channel is constructed by using consecutive said plurality of RFMTs. 8. The transmitter of claim 7, wherein the RFMT is selected according to:

where RFMT(s,n) indicates the nth FMT of the sth feedback channel, where n is one of 0, 1 and 2,

indicates the largest integer less than or equal to the quotient of "s" divided by 3, and mod(s,3) indicates the remainder of "s" divided by 3. 9. The transmitter of claim 7, wherein the RFMT is selected according to:

where RFMT(s,n) indicates the nth FMT of the sth feedback channel, where n is one of 0, 1 and 2,

indicates the largest integer less than or equal to the number obtained by dividing "s" by 2, and mod(s,2) indicates the remainder obtained by dividing "s" by 2. 10. The transmitter of claim 7, wherein the processor is further configured to: dividing each of said RFMTs constituting said feedback channel into a plurality of HRAQ flits, i.e., HMTs; Selecting a reordered HARQ flit, i.e., an RHMT, from the plurality of HMTs; and A HARQ feedback channel is constructed by using the consecutive RHMTs. 11. The transmitter of claim 10, wherein the RHMT is selected according to:

RHMT(k,m) indicates the m-th HARQ flit of the k-th HARQ feedback channel, where m is one of 0, 1, and 2,

indicates the largest integer less than or equal to the quotient of k divided by 2, and

The largest integer less than or equal to the quotient of k' divided by 3 is indicated.

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