WO2010128814A2 - Method and apparatus for transmitting/receiving semi-persistent scheduling data in a wireless communication system - Google Patents

Abstract

The present invention relates to a method and to an apparatus for transmitting/receiving semi-persistent scheduling data in a wireless communication system. The method in which a terminal transmits semi-persistent scheduling (hereinafter, referred to as "SPS") data in a wireless communication system according to one aspect of the present invention, comprises: a step in which the terminal receives SPS activation control information from a base station; a step in which the terminal receives a physical downlink control channel (hereinafter, referred to as "PDCCH") containing a precoding matrix index (hereinafter, referred to as "PMI") from the base station; and a step in which the terminal precodes, using the PMI, SPS data and a demodulation reference signal (hereinafter, referred to as "DM-RS") to be transmitted, and transmits the SPS data and the DM-RS to the base station.

Description

Method and apparatus for semi-persistent scheduling data transmission and reception in wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving semi-persistent scheduling data in a wireless communication system.

In the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) system, when an uplink subframe consists of 2 slots with a 1 ms interval and one 0.5 ms slot uses a normal cyclic prefix, 7 In case of including 6 OFDM symbols and including 6 OFDM symbols in case of using an extended cyclic prefix, the UE is called an uplink demodulation reference signal (DM-RS). In the slot unit, the terminal transmits one symbol in a frequency resource region configured for data transmission. In case of using the normal cyclic prefix, the UE transmits the DM-RS through the fourth OFDM symbol of the slot. In case of using the extended cyclic prefix, the UE transmits the DM-RS through the third OFDM symbol of the slot. . At this time, the code resource of the DM-RS is a cyclic shift of the ZC, CAZAC sequence or ZC, CAZAC sequence and is applied by receiving the code resource of the DM-RS applied by the base station from the base station. FIG. 3 illustrates a general data transmission process in a 3GPP LTE system and an LTE-advanced (LTE-A) system. As shown in FIG. 1, when a base station transmits UL grant PDCCH indicating scheduling information such as uplink bandwidth allocation and a transmission scheme to the UE, the UE transmits data through the allocated bandwidth. do. In this case, the terminal receiving the uplink grant control information may transmit data through a physical uplink shared channel (hereinafter, referred to as a "PUSCH") in uplink after 4 subframes. When the terminal transmits general data, the base station receives scheduling information such as uplink bandwidth and transmission scheme information from the base station through uplink grant control information and transmits the data each time the data is transmitted.

In the 3GPP LTE and LTE-A system, in addition to the basic uplink transmission process described above, a semi-continuous scheduling as an uplink transmission process that supports uplink traffic, which requires the periodic transmission of a fixed data size. semi-persistent scheduling, hereinafter referred to as "SPS"), may be applied to the transmission process.

FIG. 2 is a diagram illustrating a data transmission process applying uplink semi-persistent scheduling (hereinafter, referred to as "SPS") in 3GPP LTE and LTE-advanced (LTE-A) systems.

As shown in FIG. 2, when the terminal receives the SPS activation control information (SPS activation PDCCH), the UE transmits the fixed transmission scheme, transmission mode, and fixed frequency at regular intervals until the SPS release control information (SPS release PDCCH) is received. At least initial transmission of the corresponding uplink data is performed by applying resource allocation.

Accordingly, the UE does not need uplink grant control information every time uplink data is transmitted. Accordingly, in the LTE system, uplink transmission of (or at least initial transmission) uplink data to which the semi-continuous scheduling is applied is performed. The base station does not transmit the grant control information and the terminal also does not expect to receive. In the situation where uplink grant control information is not transmitted from the base station to the terminal every time data is transmitted for uplink data transmission to which such semi-continuous scheduling is applied, any LTE-A terminal to which the corresponding scheduling scheme is applied as an uplink transmission method When pre-coding data and / or DM-RS to be transmitted and / or when a precoding transmission scheme is applied, a situation in which a precoding matrix to be precoded is not smoothly indicated through uplink grant control information.

As described above, when the SPS data is transmitted, it is necessary to define the transmission data and the precoding method of the DM-RS.

An object of the present invention is to provide an SPS data transmission / reception method and apparatus for defining transmission data and a precoding method of DM-RS when transmitting semi-durable scheduling data.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to achieve the above object, in the semi-persistent scheduling (SPS) data transmission method in a terminal of a wireless communication system according to an aspect of the present invention, the terminal is SPS active control information from the base station Receive a physical downlink control channel (hereinafter referred to as "PDCCH") including a precoding matrix index ("PMI") from the base station; SPS data and a demodulation reference signal (hereinafter referred to as "DM-RS") to be transmitted are precoded using the PMI.

In order to achieve the above object, in the method of receiving semi-persistent scheduling (hereinafter referred to as "SPS") data in the base station of the wireless communication system according to another aspect of the present invention, the base station is the SPS active control information to the terminal Transmit a physical downlink control channel (hereinafter referred to as "PDCCH") including a precoding matrix index (hereinafter referred to as "PMI") to the terminal; Precoded SPS data and a demodulation reference signal (demodulation reference signal, hereinafter referred to as "DM-RS") are received from the PMI.

In this case, the transmission period of the PDCCH including the PMI may be determined according to the transmission period of a sounding reference signal (hereinafter referred to as "SRS") transmitted by the terminal.

In addition, the transmission time of the PDCCH including the PMI may be a time that is separated by an offset determined in consideration of the processing time from the time when the base station receives the SRS transmitted by the terminal.

In order to achieve the above object, in the semi-persistent scheduling (SPS) data transmission method in a terminal of a wireless communication system according to another aspect of the present invention, the terminal controls the SPS activation from the base station Receives information, selects a precoding matrix from among a subset of codebooks for SPS data transmission, and precodes SPS data and a demodulation reference signal (DM-RS) to be transmitted using the precoding matrix. To transmit.

In order to achieve the above object, in the method of receiving semi-persistent scheduling (hereinafter referred to as "SPS") data in the base station of the wireless communication system according to another aspect of the present invention, the base station controls the SPS activation to the terminal Information is transmitted, and the terminal receives precoded SPS data and a demodulation reference signal (DM-RS), using a precoding matrix selected from a subset of codebook subsets for SPS data transmission.

The codebook subset for SPS data transmission may include a precoding matrix that does not form a beam in a specific direction.

In order to achieve the above object, a terminal according to another aspect of the present invention is semi-persistent scheduling (hereinafter referred to as "SPS") active control information and a precoding matrix index (hereinafter referred to as "SPS") from the base station A receiving module for receiving a physical downlink control channel (hereinafter referred to as a " PDCCH "), SPS data and a demodulation reference signal to be transmitted using the PMI. And a transmission module for transmitting the precoded SPS data and the DM-RS to the base station.

In order to achieve the above object, a base station according to another aspect of the present invention is semi-persistent scheduling (hereinafter referred to as "SPS") active control information and precoding matrix index (hereinafter referred to as "SPS") to the terminal; A transmission module for transmitting a physical downlink control channel (hereinafter referred to as "PDCCH") including a PMI "; And a receiving module configured to receive SPS data and a demodulation reference signal (DM-RS), which are precoded using the PMI, from the terminal.

In order to achieve the above object, a terminal according to another aspect of the present invention, a receiving module for receiving semi-persistent scheduling (hereinafter referred to as "SPS") active control information from the base station, codebook subset for SPS data transmission A processor for selecting a precoding matrix from among the precoding matrix and precoding SPS data and a demodulation reference signal (DM-RS) to be transmitted using the selected precoding matrix, and the SPS data and the DM- And a transmission module for transmitting the RS.

In order to achieve the above object, the base station according to another aspect of the present invention is a transmission module for transmitting semi-persistent scheduling (hereinafter referred to as "SPS") active control information to the terminal and SPS data transmission from the terminal And a receiving module that receives precoded SPS data and a demodulation reference signal (hereinafter, referred to as "DM-RS") using a precoding matrix selected from among the codebook subsets.

[Effects of the Invention]

According to embodiments of the present invention, a method and apparatus for transmitting and receiving SPS data defining a precoding method of transmission data and DM-RS when transmitting semi-durable scheduling data is proposed.

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

1 is a diagram illustrating a general data transmission process in an LTE-A (LTE-advanced) system.

FIG. 2 is a diagram illustrating a process of transmitting semi-persistent scheduling (SPS) data in an LTE-advanced (LTE-A) system.

3 is a flowchart showing a method of transmitting SPS data according to the first embodiment of the present invention.

4 is a flowchart illustrating a method of transmitting SPS data according to a third embodiment of the present invention.

5 is a flowchart illustrating a method of transmitting SPS data according to a fourth embodiment of the present invention.

6 is a diagram illustrating a configuration of a mobile station and a base station in which embodiments of the present invention can be implemented.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details. For example, the following detailed description will be described in detail on the assumption that the mobile communication system is a 3GPP LTE-A system, but is applicable to any other mobile communication system except for the specific matters of the 3GPP LTE-A system. .

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

In addition, in the following description, it is assumed that a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), a relay node, and the like. In addition, it is assumed that the base station collectively refers to any node in the network stage that communicates with the terminal such as a Node B, an eNode B, a Base Station, and a Relay Node.

If the uplink precoding transmission mode is configured as an uplink MIMO transmission scheme of the LTE-A terminal, the uplink grant control information from the LTE-A base station for the corresponding terminal includes resource allocation information and HARQ-related information (eg, new data indicator, redundancy version, etc.), a precoding matrix index (hereinafter referred to as "PMI") of a precoding matrix to be used when precoding data to be transmitted by the UE, and a modulation coding method (modulation and coding scheme, MCS). ) And optionally rank related information.

The PUSCH of the LTE-A system includes a DM-RS transmission symbol identically or similarly as described above with respect to the LTE system in front of the present invention, if any LTE-A terminal in a series of uplink MIMO precoding transmission mode When configured, the DM-RS defined in the data transmission frequency resource region in any uplink subframe may be precoded into the same precoding matrix as the precoding matrix used when precoding the data of the PUSCH.

In addition, when any LTE-A terminal has a plurality of transmission antennas and the terminal is configured in a series of uplink MIMO precoding transmission modes in the LTE-A system, individual transmissions configured by the number of rank values set A unique DM-RS orthogonal transmission resource for each layer may be set and transmitted. At this time, in the case of the LTE system of the present invention as an orthogonal transmission resource of the DM-RS, orthogonal code resources may be set as described above, and may be a cyclic shift of a ZC, a CAZAC sequence or a ZC, a CAZAC sequence. . The number of cyclic shifts required as an orthogonal code resource of DM-RS required in a situation where the LTE-A UE is configured in an uplink MIMO precoding transmission mode is configured as the number of rank values indicated for transmission. It can be limited to numbers. If one of the uplink precoding transmission modes of the LTE-A terminal applies a single-user MIMO (SU-MIMO) and a multi-user MIMO (MU-MIMO), an arbitrary frequency band in any uplink subframe One or more LTE-A UEs may transmit the total number of transport layers within the network. Cycling shift based orthogonal code resource configuration on existing frequency resources may be performed to mitigate interference between transport layers or to improve channel estimation capability. In addition, an orthogonal code cover on a time interval between two DM-RS symbols in one uplink subframe may be applied. In this case, the cyclic shift as an orthogonal DM-RS code resource mapped to a frequency resource region in any DM-RS symbol and a pair between specific indexes of orthogonal code covers between two DM-RS symbols are orthogonally distinguished from each other. The entire DM-RS code resource is defined. The configuration of uplink data transmission of the DM-RS code resource may be indicated by the base station through uplink grant control information.

The cyclic shift index value or the index value of the pair of the cyclic shift and the orthogonal code cover described in the present invention may be included in the uplink grant control information. That is, the base station specifies a specific bit in the uplink grant control information ("DCI") format to expressly or implicitly the cyclic shift index value or the index of the pair of cyclic shift and orthogonal code cover. The value may be informed to the UE, or (eg one) the cyclic shift index value of the transport layer or the index value of the pair of the cyclic shift and the orthogonal code cover is explicitly indicated by the base station through the uplink grant control information and partially The cyclic shift index value of the other transport layer (except for one) or the index value of the pair of cyclic shift and orthogonal code cover may be set implicitly with the association of the explicit indication. For example, the DM-RS orthogonal code resources of the other one or more transport layers may be determined by using one value on uplink grant control information of the DM-RS orthogonal code resources of the first transport layer explicitly indicated. It is possible to apply a method that is sequentially set to a recursive series of offsets within an RS code resource index set.

When any LTE-A terminal performs uplink data transmission in a situation in which an uplink precoding transmission mode is configured from a base station, the terminal receives uplink grant control information from the base station whenever data transmission is performed through the uplink PUSCH. In transmitting uplink data to the PUSCH according to the received control information, the data and the DM-RS are precoded and transmitted using a precoding matrix of the PMI included in the uplink grant control information.

PUSCH for transmitting corresponding uplink data through uplink grant control information for initial transmission (or retransmission may be included in some cases) of all uplink data in an uplink transmission scheme applicable to the LTE-A system. While the resource allocation information for the transmission and the control information required according to the transmission mode can be instructed to the corresponding terminal, another uplink transmission method that can be applied in the LTE-A system as described above in the semi-continuous There is a transmission method based on scheduling. When the SPS activation control information (SPS activation PDCCH) is received through the PDCCH, the characteristics of the transmission scheme are fixed period, fixed frequency resource and transmission mode until the SPS release control information (SPS release PDCCH) is received in any PDCCH. The uplink grant control information from the base station is not transmitted to the terminal when uplink data (which may be limited to uplink initial data transmission in some cases) is transmitted through the PUSCH.

Hereinafter, in the present invention, when the LTE-A precoding transmission mode is configured in uplink PUSCH transmission based on uplink semi-continuous scheduling, a frequency domain (or a time domain) on a DM-RS and further on the DM-RS and data symbols We propose a method of applying precoding on the < RTI ID = 0.0 >

 A method of transmitting and receiving SPS data according to a first embodiment of the present invention will be described with reference to FIG. 3. 3 is a flowchart showing a method of transmitting SPS data according to the first embodiment of the present invention.

When the terminal receives the SPS activation control information (SPS activation PDCCH), the DM-RS uplink initial data is transmitted in a designated transmission mode through a fixed frequency resource at regular intervals until the SPS release control information (SPS release PDCCH) is received. And a PUSCH configured of data symbols, wherein the uplink transmission mode of the corresponding LTE-A terminal is a precoding transmission mode (a series of SU-MIMO or MU-MIMO or any single layer precoding transmission mode). Cover) is set or configured. In the first embodiment of the present invention, the terminal in which the SRS is configured is a transmission mode configured for fixed frequency resources at predetermined time intervals until the SPS release control information (SPS release PDCCH) is received. The PMI included in the active control information may be precoded and transmitted.

As shown in Figure 3, the terminal receives the SPS activity control information from the base station (S310). The SPS activity control information includes frequency resource allocation, MCS, transmission mode and PMI related information. The base station transmits a PMI to be used by the terminal in a transmit precoding matrix index (TPMI) field of the SPS activity control information.

The terminal precodes the DM-RS and data of the transmission PUSCH on the frequency domain or the time domain using the PMI indicated in the TPMI field of the SPS activity control information (S320). The UE transmits uplink data (which may be limited to initial data or defined as initial data and retransmission data) at regular time intervals until receiving the SPS release control information (SPS release PDCCH). RS and data symbols are transmitted, and each time the corresponding DM-RS and data symbols are transmitted, they are precoded using the PMI included in the SPS activity control information.

The terminal transmits the precoded DM-RS and data symbols to the base station (S330).

Next, the SPS data transmission and reception method according to the second embodiment of the present invention will be described.

In the second embodiment of the present invention, when transmitting the SPS data, the UE designates and transmits an uplink transmission mode in which data symbols on the PUSCH and the DM-RS are not precoded in the frequency domain (or time domain). As an uplink transmission mode that does not apply a series of precodings, there may be a single antenna or a single antenna port transmission mode, and if defined, there may be a series of multiple antenna transmission diversity transmission modes.

Accordingly, the second embodiment of the present invention proposes a DCI format of an uplink SPS active physical downlink control channel (hereinafter referred to as "PDCCH") for a transmission mode that does not apply precoding.

When the uplink transmit diversity transmission mode is applied, the SPS active PDCCH is one or more cyclic shift values or cyclic shift-orthogonalities of one or more DM-RSs designated as the same number depending on the number of transmit antennas or transmit antenna ports configured by the UE. Fields that explicitly or implicitly specify information of pairs of code covers and clustered DFT-s-OFDMA or single carrier FDMA ("SC-FDMA"). It may include a resource assignment field (resource assignment field) indicating a resource allocation for).

When a single antenna (or a single power amplifier transmission mode) or a single antenna port transmission mode is applied other than the uplink transmit diversity transmission mode, the SPS-enabled PDCCH becomes the SPS activation of the LTE system of the existing 3GPP Release-8 / 9. It may have the same format as the PDCCH, and the LTE RA field of the SPS active PDCCH of the LTE system is a resource assignment field indicating resource allocation for clustered DFT-s-OFDMA (DFT-s-OFDMA). It may have an alternate format.

In case that both the transmit diversity transmission mode and the single power amplifier transmission mode are applicable, the base station should inform the terminal which transmission mode to apply in transmitting data in the uplink SPS transmission method. In the second embodiment of the present invention, We propose three ways of informing the transmission mode.

The first method is a method of using an identifier (C-RNTI) as a plurality of terminal specific identifiers (IDs) for SPS. That is, the base station defines the first identifier and the second identifier to the LTE-A terminal is set in the SRS transmission scheme, and in the diversity transmission mode masks the SPS active control information using the first cell identifier, and a single antenna (Or a single power amplifier transmission mode) or a single antenna port transmission mode may mask the SPS active control information using the second identifier.

The second method is to designate a transmission mode in advance by RRC (radio resource control) signaling. The base station may inform the terminal of the transmission mode through RRC (radio resource control) signaling in advance. In this case, the RRC signaling may be made specifically for the LTE-A terminal.

According to the third method, the base station may distinguish a transmission mode by attaching a 1-bit or 2-bit flag at the beginning on the SPS active control information PDCCH. At this time, the base station separately codes a flag for identifying a transmission mode, attaches it to the beginning of the SPS activity control information, and multiplexes the same.

Next, the SPS data transmission and reception method according to the third embodiment of the present invention will be described with reference to FIG. 4 is a flowchart illustrating a data transmission method of an LTE-A terminal of an uplink SPS transmission method according to a third embodiment of the present invention.

In the third embodiment of the present invention, the base station applies a scheme in which the terminal transmits the uplink SPS data to the PUSCH by applying an arbitrary precoding transmission mode. At this time, a PDCCH including a PMI to be used when applying a precoding transmission mode to a corresponding SPS PUSCH transmission is transmitted at regular intervals, and the UE periodically receives the PDCCH transmitted by the base station and uses the PMI included in the DCI format to transmit the PDCCH. Data symbols and the DM-RS are precoded on the frequency domain or the time domain for transmission.

As shown in FIG. 4, the LTE-A terminal in which the precoding transmission mode is set receives the SPS activity control information from the base station (S410). The SPS activity control information includes at least one of frequency resource allocation, MCS, transmission mode related information, and precoding PMI information.

The terminal periodically receives the PDCCH including the PMI from the base station (S420).

In the LTE-A system, when the UE transmits the uplink SPS data (PUSCH) by applying the proposed scheme, the base station periodically transmits the PDCCH including the PMI to periodically measure the uplink channel to designate the PMI. A sounding reference signal (hereinafter referred to as "SRS") is transmitted. In this case, since the terminal applying the LTE-A uplink precoding transmission mode has a plurality of transmit antennas or a plurality of transmit antenna ports, SRSs are transmitted for each of a plurality of transmit antennas or a plurality of transmit antenna ports. The SRS for each antenna is multiplexed in the form of TDM and / or FDM and / or CDM.

The base station transmits the transmission period for transmitting the corresponding uplink SPS PUSCH transmission of the PDCCH including the PMI to the terminal performing the transmission cycle of the SRS configured by the base station for the terminal and 20 ms (generally, the SPS performs VoIP traffic transmission. In consideration of the use, the packet output period of the voice codec is 20 ms), the maximum common factor may be set, or the maximum or minimum value of the two values of the SRS transmission period and 20 ms may be set. In addition, the transmission time point of the PDCCH may be a time point separated by a fixed offset determined in consideration of the processing time from the reception time point of the SRS. Alternatively, the PDCCH including the PMI can be periodically transmitted by designating a specific subframe index on an arbitrary 10 ms radio frame, and in this case, the PDCCH including the PMI is separated from the reception time of the SRS by a fixed offset determined in consideration of the processing time. Can be set in consideration.

The PDCCH includes a data symbol on a target PUSCH and a TPMI field indicating PMI information to be used when precoding a DM-RS. And additionally, a resource assignment field indicating resource allocation for clustered DFT-s-OFDMA or SC-FDMA, cyclic shift or cyclic shift-orthogonality of DM-RS. At least one of a field indicating a pair of code covers and a field specifying detailed control information of an MCS and a transmission scheme may be included.

The UE precodes the data symbols and the DM-RS in the frequency domain (or time domain) using the PMI included in the received PDCCH (S430) and transmits (S440).

In the third embodiment of the present invention, a method for performing uplink SPS PUSCH transmission of an arbitrary LTE-A terminal is periodically transmitted through a transmission of a PDCCH including a PMI from a base station, but a series of long-term single layer precoding transmissions PMI information for uplink SPS PUSCH transmission in UE-specific RRC signaling periodically or aperiodically semi-static on the assumption that a long-term single layer precoding transmission mode or transmission method is applied. A signaling method may be applied. Next, a method of transmitting SPS data through an uplink PUSCH of an arbitrary LTE-A terminal according to the fourth embodiment of the present invention will be described with reference to FIG. 5. 5 is a flowchart illustrating a method of transmitting SPS data according to a fourth embodiment of the present invention.

In the fourth embodiment of the present invention, the PMI codebook subset for SPS transmission is defined in the entire PMI codebook, and the UE randomly selects an arbitrary PMI codeword (or vector) from the PMI codebook subset for SPS transmission or PMI for SPS transmission. PMI codewords of the codebook subset are cyclically shifted in transmission symbols or transmission slots (0.5 ms) or subframes to sequentially display DM-RS and data symbols on an uplink SPS transmission PUSCH on a frequency domain or a time domain. Precode and send.

As shown in Figure 5, the terminal receives the SPS activity control information from the base station (S510). The SPS activity control information includes frequency resource allocation, MCS, transmission mode related information, and the like. The SPS activity control information (PDCCH) may include a rank value, that is, a value of the number of transport layers or transport streams. Unlike this, the LTE-A terminal performing the corresponding uplink SPS PUSCH transmission receives the rank value applied to the transmission as the SPS activity control information in addition to the RRC signaling or the uplink SPS PUSCH seen between the terminal and the base station. You can promise a fixed rank value to apply to the transmission.

The terminal selects the PMI from among the codebook subsets for SPS data transmission of the corresponding rank (S520).

According to the fourth embodiment of the present invention, in the case of a rank value set or fixed from the base station in the entire PMI codebook, the PMI codebook subset to be used for SPS data transmission is predefined. As an example of this, when the PMI codebook subset is designated, the PMI in the antenna selection format that does not form a beam in a specific direction is set to the highest rank for uplink two transmit antennas or four transmit antennas. For the remaining rank values except for the case of), a method of selecting and specifying a specified number may be applied. The UE selects an arbitrary precoding codeword (matrix or vector) to be used for precoding DM-RS and data symbols on the corresponding PUSCH in the codebook PMI subset for SPS data transmission of the corresponding rank, wherein the transmission symbol or By randomly selecting storage slots (0.5 ms) or subframes or N (> 1) subframe units, or recursively rotating precoding codewords (matrix or vector) of the PMI codebook subset corresponding to the specified rank value. (cyclic shifting) It can also select and use.

Any LTE-A terminal performing uplink SPS PUSCH transmission transmits a precoding codeword (matrix or vector) to use when precoding the DM-RS and data symbols on the PUSCH. The precoding codeword to be changed can be set for each frame, by applying the above selection method.

As an example, in defining the PMI codebook subset to be applied in the present invention, an antenna selection PMI that does not form a beam in a specific direction in the entire PMI codebook is included for each rank and does not form a beam in a specific direction. Antenna selection A set of PMIs can be designated as a codebook subset for SPS data transmission. In this case, the rank value applied to define the codebook subset may be applied as a case of the remaining rank value for the highest rank value (full rank).

The PUSCH transmission PMI codebook subset configured for uplink SRS data transmission may be designated as an antenna group selection codebook or an aligned codebook in the form of a DFT.

The UE precodes the DM-RS and data symbols on the corresponding SPS transmission PUSCH on the frequency domain or the time domain using the selected precoding matrix (S530) and transmits (S540).

Alternatively, the UE may precode data symbols on the frequency domain or the time domain using the selected precoding matrix, and transmit the DM-RS without precoding.

FIG. 6 is a diagram illustrating a configuration of a mobile station and a base station in which embodiments of the present invention described above can be implemented as another embodiment of the present invention.

The mobile station (AMS) and the base station (ABS) are antennas 200 and 210 capable of transmitting and receiving information, data, signals, and / or messages, and a transmission module (Tx module, 240, 260) for controlling the antenna and transmitting a message. ), A reception module (Rx module 260, 270) for receiving a message by controlling an antenna, a memory (280, 290) for storing information related to communication with a base station, and a processor for controlling a transmission module, a reception module and a memory ( 260 and 230, respectively. In this case, the base station may be a femto base station or a macro base station.

The antennas 200 and 210 transmit a signal generated by the transmission modules 240 and 260 to the outside or receive a wireless signal from the outside and transmit the signal to the receiving modules 260 and 270. When the multiple antenna (MIMO) function is supported, six or more antennas may be provided.

Processors 260 and 230 typically control the overall operation of the mobile terminal or base station. In particular, the processor may include a control function for performing the above-described embodiments of the present invention, a medium access control (MAC) frame variable control function, a handover function, an authentication and encryption function, etc. according to service characteristics and a propagation environment. Can be done. In addition, the processors 260 and 230 may further include an encryption module for controlling encryption of various messages and a timer module for controlling transmission and reception of various messages, respectively.

The transmission modules 240 and 260 may perform a predetermined coding and modulation on signals and / or data that are scheduled from a processor and transmitted to the outside, and then may be transmitted to the antennas 200 and 210.

The receiving modules 260 and 270 decode and demodulate the radio signals received through the antennas 200 and 210 from the outside to restore the original data to the processor 260 and 230. I can deliver it.

The memory 280 or 290 may store a program for processing and controlling the processor, and input / output data (in the case of a mobile station, an uplink grant allocated from a base station, a system information, and a station identifier) STID), flow identifier (FID), action time (Action Time), area allocation information, frame offset information, etc.) may be temporarily stored.

In addition, the memory may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory), RAM (Random Access Memory, RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), Magnetic Memory, Magnetic It may include a storage medium of at least one type of disk, optical disk.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable those skilled in the art to implement and practice the invention. Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made without departing from the scope of the present invention. For example, those skilled in the art can use each of the configurations described in the above-described embodiments in combination with each other.

Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (19)

1. In the semi-persistent scheduling (SPS) data transmission method in a terminal of a wireless communication system,

   Receiving SPS activity control information from a base station;

   Receiving a physical downlink control channel (hereinafter referred to as "PDCCH") including a precoding matrix index (hereinafter referred to as "PMI") from the base station; And

   And precoding SPS data and a demodulation reference signal (DM-RS) to be transmitted to the base station using the PMI.
2. The method of claim 1,

   The transmission period of the PDCCH including the PMI is SPS data transmission method, characterized in that determined according to the transmission period of a sounding reference signal (hereinafter referred to as "SRS") transmitted by the terminal.
3. The method of claim 1,

   The transmission time of the PDCCH including the PMI is SPS data transmission method, characterized in that the time is separated by the offset determined in consideration of the processing time from the time the SRS transmitted by the base station.
4. In the method of receiving semi-persistent scheduling (SPS) data at a base station of a wireless communication system,

   Transmitting SPS activity control information to the terminal;

   Transmitting a physical downlink control channel (hereinafter referred to as "PDCCH") including a precoding matrix index (hereinafter referred to as "PMI") to the terminal; And

   And receiving a precoded SPS data and a demodulation reference signal (hereinafter referred to as "DM-RS") from the terminal using the PMI.
5. The method of claim 4, wherein

   The transmission period of the PDCCH including the PMI is SPS data receiving method, characterized in that determined according to the transmission period of a sounding reference signal (hereinafter referred to as "SRS") transmitted by the terminal.
6. The method of claim 4, wherein

   The transmission time point of the PDCCH including the PMI is SPS data receiving method, characterized in that the time is separated by the offset determined in consideration of the processing time from the time that the base station receives the SRS.
7. In the semi-persistent scheduling (SPS) data transmission method in a terminal of a wireless communication system,

   Receiving SPS activity control information from a base station;

   Selecting a precoding matrix from among a codebook subset for SPS data transmission; And

   And precoding the SPS data and a demodulation reference signal (DM-RS) to be transmitted by using the precoding matrix.
8. The method of claim 7, wherein

   The codebook subset for SPS data transmission includes a precoding matrix that does not form a beam in a specific direction.
9. The method of claim 7, wherein

   The selecting of the precoding matrix may include selecting an arbitrary precoding matrix from among the codebook subsets for transmitting the SPS data.
10. The method of claim 7, wherein

    The step of selecting the precoding matrix SPS data transmission method characterized in that to select the precoding matrix included in the codebook subset for SPS data transmission in turn.
11. In the method of receiving semi-persistent scheduling (SPS) data at a base station of a wireless communication system,

    Transmitting SPS activity control information to the terminal;

    Receiving SPS data and a demodulation reference signal (DM-RS), which are precoded using a precoding matrix selected from a subset of codebook subsets for SPS data transmission, from the terminal. Way.
12. The method of claim 11,

    The codebook subset for SPS data transmission includes a precoding matrix that does not form a beam in a specific direction.
13. Physical downlink control channel including semi-persistent scheduling (“SPS”) active control information and a precoding matrix index (“PMI”) from the base station channel, hereinafter referred to as "PDCCH";

    A processor for precoding SPS data and a demodulation reference signal (hereinafter referred to as “DM-RS”) to be transmitted using the PMI; And

    And a transmission module for transmitting the precoded SPS data and DM-RS to the base station.
14. Physical downlink control channel including semi-persistent scheduling (SPS) active control information and a precoding matrix index (PMI) to the UE. channel for transmitting a channel, hereinafter referred to as "PDCCH"; And

    And a receiving module for receiving SPS data and a demodulation reference signal (hereinafter referred to as "DM-RS") precoded using the PMI from the terminal.
15. The method of claim 14,

    The base station, characterized in that the transmission period of the PDCCH including the PMI is determined according to the transmission period of a sounding reference signal (hereinafter referred to as "SRS") transmitted by the terminal.
16. The method of claim 14,

    The transmission time point of the PDCCH including the PMI is an offset determined by considering the processing time from the time point at which the base station receives the SRS transmitted by the terminal.
17. A receiving module for receiving semi-persistent scheduling (“SPS”) active control information from a base station;

    A processor that selects a precoding matrix from among a subset of codebooks for SPS data transmission and precodes a SPS data and a demodulation reference signal (DM-RS) to be transmitted using the selected precoding matrix; And

    And a transmission module for transmitting the SPS data and the DM-RS.
18. The method of claim 17,

    The codebook subset for SPS data transmission comprises a precoding matrix that does not form a beam in a specific direction.
19. A transmission module for transmitting semi-persistent scheduling (SPS) active control information to the terminal;

    And a receiving module for receiving SPS data and a demodulation reference signal (DM-RS), which are precoded using a precoding matrix selected from a subset of codebook subsets for SPS data transmission, from the terminal.

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