JP2019125823A - Transmission device and reception device - Google Patents

Abstract

To solve a problem in which, when a large number of terminals accommodated by contention-based wireless communication technology share frequency resources, the number of data signals of terminals that are non-orthogonally multiplexed in a spatial domain increases, and therefore, when the number of data signals of the terminals that are non-orthogonally multiplexed is very large, the transmission characteristic is degraded due to residual interference after interference cancellation in reception processing.SOLUTION: A transmission device for transmitting a data signal to a reception device includes a transmission processing unit that transmits the data signal without SR transmission or reception of transmission permission control information transmitted by the reception device, an identification signal multiplexing unit that multiplexes identification signals into orthogonal resources, and a control information reception unit that receives in advance transmission parameters relating to the transmission of the data signal, and the transmission parameter includes one of first data signal transmission for transmitting the data signal by using continuous frequency resources and second data transmission for transmitting the data by using non-continuous and equally-spaced frequency resources.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a transmitter and a receiver.

In recent years, Fifth Generation mobile radio communication systems (5G) have attracted attention, and MTC (mMSC; Massive Machine Type Communications) mainly by a large number of terminal devices, ultra-reliable, low delay communication (Ultra). -reliable and low latency
It is expected that the communication technology to realize large capacity and high speed communication (Enhanced mobile broadband) will be developed. In particular, in the future, it is expected that IoT (Internet of Things) will be realized with various devices, and the realization of mMTC is one of the important elements of 5G.

For example, in 3GPP (3rd Generation Partnership Project), M2M (Machine-to-Machine) communication technology is standardized as MTC (Machine Type Communication) that accommodates a terminal device that transmits and receives small size data (non-patented) Literature 1). Furthermore, to support low rate data transmission in a narrow band, NB-IoT (Narrow Band-IoT)
The specification of is also in progress (Non-Patent Document 2).

Long Term Evolution (LTE) specified by 3GPP, LTE-Advanc
In ed, LTE-Advanced Pro, etc., the terminal device transmits a scheduling request (SR; Scheduling Request) when traffic of transmission data is generated, and after receiving control information (UL Grant) of transmission permission from the base station device, a predetermined request is made. Data transmission is performed using transmission parameters of control information included in UL Grant at timing. As described above, a radio communication technology is implemented in which the base station apparatus performs radio resource control of all uplink data transmission (data transmission from the terminal apparatus to the base station apparatus). Therefore, the base station apparatus can realize orthogonal multiple access (OMA) by radio resource control, and enables uplink data reception by simple reception processing.

  On the other hand, in such a conventional wireless communication technology, transmission and reception of control information is required before data transmission, regardless of the amount of data transmitted by the terminal device, in order for the base station device to perform all radio resource control. In particular, when the data size to be transmitted is small, the proportion of control information relatively increases. Therefore, when the terminal transmits small size data, the contention-based (Grant Free) wireless communication technology in which the terminal transmits data without receiving SR transmission or reception of UL Grant transmitted by the base station apparatus is based on control information. It is effective in terms of overhead. Furthermore, in contention based wireless communication technology, the time from data generation to data transmission can also be shortened.

3GPP, TR 36.888 V12.0.0, “Study on provision of low-cost Machine-Type Communications (MTC) User Equipments (UEs) based on LTE,”, Jun. 2013 3GPP, TR 45.820 V13.0.0, “Cellular system support for ultra-low complexity and low throughput Internet of Things (CIoT),” Aug. 2015

However, when a large number of terminal devices transmit uplink data by contention-based wireless communication technology, it is assumed that frequency resources are shared by a plurality of terminal devices, and data signals of a plurality of terminal devices have the same time. There is a problem of collision at the same frequency. Even when data signals collide at the same time and same frequency, and data are non-orthogonal multiplexed in the spatial domain from terminals that exceed the number of reception antennas of the base station, the base station apparatus sequentially cancels the interference cancel ( By applying SIC (Successive Interference Canceller), Parallel Interference Canceller (PIC), Symbol Level Interference Canceller (SLIC), Turbo Equalization (Iterative SIC, Turbo SIC, Iterative PIC), etc. It is possible to detect transmission data signals. However, when a large number of terminals accommodated by contention-based wireless communication technology share frequency resources, the number of data signals of terminals orthogonally multiplexed in the spatial domain increases as the number of accommodated terminals increases. . When the number of data signals of the terminal to be non-orthogonally multiplexed increases too much, the interference can not be removed in the reception process, and there is a problem that the transmission characteristic is degraded due to residual interference.

  The present invention has been made in view of the above points, and it is desirable to reduce the interference of non-orthogonally multiplexed signals in the spatial domain when uplink data transmission is performed by a large number of terminal devices using contention-based wireless communication technology. The object is to provide a communication method to be realized.

  (1) The present invention has been made to solve the above-described problems, and one aspect of the present invention is a transmitting apparatus for transmitting a data signal to a receiving apparatus, the transmission being transmitted by the receiving apparatus. A transmission processing unit that transmits the data signal without receiving permission control information, an identification signal multiplexing unit that multiplexes an identification signal to an orthogonal resource, and use and non-use of continuous frequency resources for transmitting the data signal And a control information receiving unit that receives in advance transmission parameters capable of indicating use of continuous and equally spaced frequency resources, and the transmission processing unit uses the continuous frequency resources based on the transmission parameters. Transmitting the data signal in one of the first data transmission for transmitting the data signal and the second data transmission for transmitting the data using the non-continuous and equally spaced frequency resources That.

  (2) Further, according to an aspect of the present invention, the transmission processing unit uses a third data transmission in which the data signal is transmitted using nonconsecutive and non-uniform frequency resources.

  (3) Further, according to an aspect of the present invention, the identification signal multiplexing unit multiplexes the identification signal on a frequency resource different from a frequency resource used for transmitting the data signal.

  (4) Further, according to one aspect of the present invention, the identification signal multiplexing unit multiplexes the identification signal to the number of frequency resources larger than the number of frequency resources used for transmitting the data signal.

  (5) Further, according to an aspect of the present invention, the transmission processing unit uses a subframe number for transmitting the data signal when only a part of OFDM symbols in the subframe is used for transmitting the data signal. Determine the OFDM symbol.

  (6) Further, according to one aspect of the present invention, when only a part of OFDM symbols in a subframe is used to transmit the data signal, the transmission processing unit uses the subframe number of the data signal to be transmitted. Determine the slot.

(7) Further, one aspect of the present invention is a receiving device that receives data signals of a plurality of transmitting devices, and is a receiving process that receives the data signal that is transmitted without transmitting the transmission permission control information. , An identification signal separation unit for separating an identification signal received together with the data from orthogonal resources, a transmission terminal identification unit for identifying the transmission apparatus that transmitted data from the identification signal, and a transmission parameter used for the data transmission The transmission parameter transmitted by the control information transmission unit includes information on frequency resources used for data transmission for each of the transmission devices, and the information on the frequency resources is continuous It is possible to indicate the use of typical frequency resources and the use of non-continuous and equally spaced frequency resources.

  (8) Further, according to an aspect of the present invention, the information of the frequency resource transmitted by the control information transmission unit includes frequency resources which are discontinuous and not at equal intervals.

  (9) Further, according to one aspect of the present invention, information of a frequency resource used by the transmission apparatus for transmitting the identification signal included in the transmission parameter transmitted by the control information transmission unit is a frequency used for transmission of the identification signal Different from resources.

  (10) Further, according to one aspect of the present invention, in the case where the transmission processing unit uses only a part of OFDM symbols in a subframe for transmission of the data signal, the reception processing unit receives the OFDM signal that receives the data signal. Is calculated from the subframe number.

  (11) A communication method of a transmitting apparatus for transmitting a data signal to a receiving apparatus, wherein the transmitting step transmits the data signal without receiving control information of a transmission permission transmitted by the receiving apparatus; Identification signal multiplexing step of multiplexing signals into orthogonal resources, and control of receiving in advance transmission parameters which can indicate the use of continuous frequency resources and the use of non-continuous and equally spaced frequency resources for transmission of the data signal Receiving the information, and the transmission processing includes transmitting the data signal using the continuous frequency resource based on the transmission parameter, the first data transmission, and the discontinuous and equally spaced frequencies. Transmit a data signal on any of the second data transmissions that transmit the data using resources.

  (12) A communication method of a receiving apparatus for receiving data signals of a plurality of transmitting apparatuses, comprising: receiving processing steps for receiving the data signals transmitted without transmitting transmission permission control information; An identification signal separation step of separating an identification signal to be received from orthogonal resources, a transmission terminal identification step of identifying the transmission apparatus that has transmitted data from the identification signal, and control information transmission to transmit in advance transmission parameters used for the data transmission And the transmission parameters include information of frequency resources used for data transmission for each of the transmission devices, and the information of the frequency resources is discontinuous and equally spaced with continuous use of frequency resources. It can indicate the use of frequency resources.

  According to the present invention, it is possible to realize the interference reduction of non-orthogonally multiplexed signals in the spatial domain when a large number of terminal apparatuses transmit uplink data by contention-based wireless communication technology. As a result, the base station apparatus can realize the accommodation of a large number of terminal apparatuses and the reduction of the amount of control information.

It is a figure showing an example of the composition of the system concerning this embodiment. It is a figure which shows an example of the sequence chart of data transmission of the terminal device which concerns on the conventional wireless communication technology. It is a figure which shows an example of the sequence chart of data transmission of the terminal device which concerns on the radio | wireless communication technology of this embodiment. It is a figure which shows an example of the flame | frame structure of the uplink which concerns on the conventional radio | wireless communication technology. It is a figure which shows an example of the flame | frame structure of the uplink which concerns on the radio | wireless communication technology of this embodiment. It is a figure which shows an example of a structure of the terminal device which concerns on this embodiment. It is a figure which shows an example of a structure of the transmission signal production | generation part 103 which concerns on this embodiment. It is a figure which shows an example of a structure of the transmission signal production | generation part 103 which concerns on this embodiment. It is a figure which shows an example of a structure of the transmission signal production | generation part 103 which concerns on this embodiment. It is a figure which shows an example of a structure of the transmission signal production | generation part 103 which concerns on this embodiment. It is a figure which shows an example of a structure of the signal multiplexing part 104 which concerns on this embodiment. It is a figure which shows an example of a structure of the base station apparatus which concerns on this embodiment. It is a figure which shows an example of a structure of the signal separation part 205-1 which concerns on this embodiment. It is a figure which shows an example of a structure of the signal detection part 206 which concerns on this embodiment. It is a figure which shows an example of a structure of the identification signal of the transmission terminal device which concerns on this embodiment. It is a figure which shows an example of the frequency resource used for uplink data transmission which concerns on this embodiment. It is a figure which shows an example of the frequency resource used for uplink data transmission which concerns on this embodiment. It is a figure which shows an example of the frequency resource used for uplink data transmission which concerns on this embodiment. It is a figure which shows an example of the frequency resource used for uplink data transmission and transmission of an identification signal which concerns on this embodiment. It is a figure which shows an example of the identification signal of uplink according to this embodiment, and data transmission. It is a figure which shows an example of the data transmission method of the uplink which concerns on this embodiment. It is a figure which shows an example of the data transmission method of the uplink which concerns on this embodiment. It is a figure which shows an example of the sequence chart of data transmission of the terminal device which concerns on the radio | wireless communication technology of this embodiment. It is a figure which shows an example of a structure of the terminal device which concerns on this embodiment. It is a figure which shows an example of the code | symbol spread of the OFDM symbol unit based on this embodiment. It is a figure which shows an example of a structure of the base station apparatus which concerns on this embodiment. It is a figure which shows an example of a structure of the terminal device which concerns on this embodiment. It is a figure which shows an example of application of the spreading code which concerns on this embodiment. It is a figure which shows an example of application of the spreading code which concerns on this embodiment. It is a figure which shows an example of a structure of the signal detection part 206 which concerns on this embodiment. It is a figure which shows an example of a structure of the terminal device which concerns on this embodiment. It is a figure which shows an example of a structure of the transmission signal production | generation part 103 which concerns on this embodiment. It is a figure which shows an example of a structure of the transmission signal production | generation part 103 which concerns on this embodiment. It is a figure which shows an example of a structure of the transmission signal production | generation part 103 which concerns on this embodiment. It is a figure which shows an example of a structure of the signal detection part 206 which concerns on this embodiment.

Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, M2M communication (Machine-to-Machine Communication, MTC (Machine Type Communication), IoT (Internet of Things) communication, NB-IoT (Narrow Band-IoT), CIoT
The transmitter will be described as an MTC terminal (hereinafter, referred to as a terminal) and the receiver as a base station on the premise of (also called "Cellular IoT"). However, the present invention is not limited to this example, and is also applicable to uplink transmission in a cellular system, in which case a terminal apparatus that transmits data via human intervention is a transmitting apparatus, and a base station apparatus is a receiving apparatus. Moreover, it is applicable also to downlink transmission of a cellular system, and in that case, the transmission / reception apparatus in data transmission becomes reverse to uplink transmission. The present invention is also applicable to D2D (Device-to-Device) communication, in which case both the transmitter and the receiver become terminal devices.

FIG. 1 shows an example of the configuration of a system according to the present embodiment. The system comprises a base station device 1
0, consisting of terminal devices 20-1 to 20-Nm. The number of terminal devices (terminals, mobile terminals, mobile stations, UEs; User Equipment) is not limited, and the number of antennas of each device may be one or more. In addition, the base station apparatus 10 may perform communication in a so-called licensed band in which use permission has been obtained from a country or region where the wireless provider provides the service, or use permission from the country or region may be used. It is also possible to perform communication by a so-called unlicensed band which is not required. Also, the base station apparatus 10 may be a macro base station apparatus having a wide coverage, or a small cell base station or pico base station apparatus (Pico eNB; evolved Node B, Small Cell) whose coverage is narrower than the macro base station apparatus.
, Low Power Node, or Remote Radio Head). Further, in the present specification, the frequency band other than the license band is not limited to the example of the unlicensed band, and may be a white band (white space) or the like. Further, the base station apparatus 10 may apply CA (Carrier Aggregation) technology using a plurality of component carriers (CC: also referred to as Component Carrier or Serving cell) in a band used in LTE communication, MTC, Communication different from MTC may be transmitted by different CCs, or data may be transmitted by the same CC. As an example of applying CA, communication different from MTC may be PCell (Primary cell) and MTC communication may be SCell (Secondary cell). Also, subcarriers (frequency), slots, or subframes (time) to be used may be divided by communication different from MTC and MTC within the same CC.

The terminal devices 20-1 to 20-Nm can transmit MTC data to the base station device 10. The terminal devices 20-1 to 20-Nm receive control information necessary for data transmission in advance from the base station device 10 or another base station device when connected to a base station. The terminal devices 20-1 to 20-Nm do not need to transmit a scheduling request (SR; Scheduling Request) after the generation of data (traffic) to be transmitted or receive the transmission permission control information (UL Grant) transmitted by the base station device. Also referred to as wireless communication technology (contention based wireless communication technology, Contention based access, Grant free access, Grant free communication, Grant free data transmission, Grant less access, autonomous access etc. Hereinafter, contention based wireless communication technology To send data). However, the terminal devices 20-1 to 20-Nm are LTE (Long Term Evolution), LTE-Advanced, LTE-Advanced.
Wireless communication technology that requires SR transmission such as Pro or UL Grant reception (non-contention based wireless communication technology, Grant-based access, Grant-based communication, Grant-based data transmission, Scheduled access, etc.) (Non-contention-based wireless communication technology) can also be used, contention-based wireless communication technology and non-contention-based wireless communication technology depending on transmission data, data size, quality of service (QoS) of transmission data, etc. The contention based wireless communication technology may be switched and used. That is, the terminal devices 20-1 to 20-Nm perform data transmission using radio resources scheduled from the base station apparatus by performing SR transmission before performing data transmission, or a radio specified in advance before data generation. It may be decided whether to transmit data by at least a part of the resource. Also, the QoS may include the reliability of data transmission, the delay time for data transmission, and the communication speed, and the power consumption for data transmission of the terminal device (for example, power per bit in data transmission) There may be indicators such as Here, the terminal device 20-1
20-Nm is not limited to MTC, and may be capable of human-to-machine communication (H2M communication) or human-to-human communication (H2H communication). In that case, PDCCH (Physical Downlink Control CHannel) is UL Grant, which is control information including transmission parameters used for data transmission by the base station apparatus 10 according to the type of data by dynamic scheduling or SPS (Semi-Persistent Scheduling).
Alternatively, it may be transmitted on a physical channel that transmits EPDCCH (Enhanced PDCCH) or other downlink control information. The terminal devices 20-1 to 20-Nm perform data transmission based on the transmission parameter of UL Grant.

First Embodiment
FIG. 2 shows an example of a sequence chart of data transmission of a terminal apparatus according to the conventional wireless communication technology. The base station apparatus transmits configuration control information when the terminal apparatus is connected (S101). The configuration control information may be notified by RRC (Radio Resource Control), may be upper layer control information such as SIB (System Information Block), or may be DCI format. Also, the physical channel to be used may be PDCCH, EPDCCH, PDSCH (Physical Downlink Shared CHannel), or another physical channel may be used. When the uplink data is generated and the UL Grant is not received, the terminal apparatus transmits an SR to request the UL Grant (S101). After receiving the SR, the base station apparatus transmits UL Grant to the terminal apparatus using PDCCH or EPDCCH (S102). In the case of FDD (also referred to as Frequency Division Duplex or frame structure type 1), the terminal apparatus is a subframe included in UL Grant in a subframe 4 msec after the subframe in which UL Grant is detected by blind decoding PDCCH or EPDCCH. Data transmission based on the parameters is performed (S103). However, in the case of TDD (also referred to as Time Division Duplex or frame structure type 2), although it is not limited to 4 msec, in order to simplify the description, FDD is assumed. The base station apparatus detects data transmitted by the terminal apparatus, and transmits ACK / NACK indicating whether there is an error in data detected in a subframe 4 msec after the subframe in which the data signal is received (S104). Here, in S101, when the resource for SR transmission is not notified by RRC, the terminal device requests UL Grant using PRACH (Physical Random Access CHannel). In addition, in S102, in the case of dynamic scheduling, data transmission of only one subframe is possible, but in the case of SPS, periodic data transmission is permitted, and information such as the SPS cycle is notified in RRC of S100. I assume. The terminal apparatus stores transmission parameters such as a resource for SR transmission notified from the base station apparatus by RRC, a period of SPS, and the like.

FIG. 3 illustrates an example of a sequence chart of data transmission of the terminal device according to the wireless communication technology of the present embodiment. First, the base station apparatus transmits configuration control information when the terminal apparatus is connected (S200). The configuration control information may be notified by RRC, may be upper layer control information such as SIB, or may be in DCI format. Also, the physical channel to be used may be PDCCH, EPDCCH, PDSCH, or another physical channel. The control information of this configuration includes radio resources and transmission parameters used in the contention based radio communication technology. Moreover, when a terminal device can also use non-contention based wireless communication technologies, such as LTE, LTE-Advanced, and LTE-Advanced Pro, the control information notified in S100 of FIG. 2 may also be included. The terminal apparatus transmits data using contention-based wireless communication technology which does not require reception of UL transmission that SR transmission or the base station apparatus transmits when uplink data is generated and the control information of S200 is received. (S201-1). Here, the terminal apparatus is notified of the number of transmissions of the same data, transmission period, transmission cycle, radio resources used for transmission, transmission parameters, etc. in S200, and requested QoS (data transmission reliability, data transmission) According to the delay time and the communication speed, the same data as S201-1 is transmitted based on the control information received in S200 (S201-2 to S201-L). However, the present invention is not limited to transmitting the same data a plurality of times, and L may be 1 and may be transmitted only once. The base station apparatus detects data transmitted by the terminal apparatus, and transmits ACK / NACK indicating whether there is an error in data detected in a subframe X msec after the subframe in which the data signal is received (S202). However, as in the conventional FDD, it may be X = 4 from data transmission or may be a different value. In FIG. 3, although the last data transmission (S201-L) is used as a reference, the present invention is not limited to this example. For example, it may be X msec after based on a subframe where the base station apparatus could detect data without error. May stop the same data transmission when the terminal detects an ACK / NACK. Further, in the contention based wireless communication technology, ACK / NACK may not be transmitted, and the base station apparatus may switch transmission / non-transmission of ACK / NACK by non-contention based and contention based wireless communication technology.

  FIG. 4 shows an example of an uplink frame configuration according to the conventional wireless communication technology. In the conventional uplink frame configuration, one frame is 10 msec and is composed of 10 subframes, one subframe is composed of 2 slots, and one slot is composed of 7 OFDM symbols. A demodulation reference signal (DMRS; De-Modulation Reference Signal) is arranged in OFDM symbol # 4 when there is an OFDM symbol in the middle of each slot, that is, OFDM symbols # 1 to # 7. Also, conventionally, when the terminal apparatus receives UL Grant in subframe # 1, data transmission can be performed in subframe # 5 after 4 msec. FIG. 5 shows an example of an uplink frame configuration according to the radio communication technology of this embodiment. The figure is an example in the case of using a contention based wireless communication technology with a frame configuration similar to that of FIG. In the contention-based wireless communication technology, the terminal apparatus can transmit data immediately after data generation, and when data is generated before subframe # 1, data transmission shown in the example of FIG. 5 is performed. In subframe # 1, a transmitting terminal identification signal is transmitted, and in subframe # 2, data is transmitted. Details of the transmission terminal identification signal and the method of transmitting data will be described later.

An example of a structure of the terminal device which concerns on FIG. 6 at this embodiment is shown. However, the minimum blocks necessary for the present invention are shown. The terminal device is assumed to be able to use both contention based wireless communication technology and non-contention based wireless communication technology as the above-mentioned prior art as data transmission of MTC like terminal devices 20-1 to 20-Nm. Explain to. However, the present invention is also applicable to the case where the terminal apparatus can use only the contention based wireless communication technology. In that case, although the process related to the non-contention based wireless communication technology does not exist, the basic configuration is the same. The terminal apparatus receives control information transmitted on the EPDCCH, PDCCH, and PDSCH from the base station apparatus at the receiving antenna 110. The wireless reception unit 111 down-converts the received signal to a baseband frequency, performs A / D (Analog / Digital; analog / digital) conversion, and removes a CP (Cyclic Prefix) from the digital signal. The control information detection unit 112 Enter in The control information detection unit 112 detects, by blind decoding, a Downlink Control Information (DCI) format addressed to the mobile station transmitted on the PDCCH or the EPDCCH. Blind decoding performs decoding processing on candidate Common Search Space (CSS) and UE-specific Search Space (USS) in which DCI format is arranged, and cyclic redundancy check (CRC: Cyclic Redundancy) added to a data signal. If no error bit is detected in Check), it is detected as control information addressed to the own station. Since only the destination terminal device can detect control information in the base station device, C-RNTI (Cell-Radio Network Temporary Identifier) or SPS C-R, which is an ID unique to the destination terminal device
A CRC subjected to an exclusive OR operation with NTI or the like is added to the data signal. Therefore, before the CRC determines the presence or absence of an error bit, the terminal apparatus performs an exclusive OR operation of the CRC and the C-RNTI or the SPSC-RNTI, and determines the presence or absence of the error bit according to the CRC of the operation result. Here, as the DCI format, a plurality of formats are defined according to the application, and DCI format 0 for uplink single antenna, DCI format 4 for MIMO (Multiple Input Multiple Output), etc. are defined. Further, the control information detection unit 112 also detects when an RRC signal is received. The control information detection unit 112 inputs the detected control information to the transmission parameter storage unit 113. The transmission parameter storage unit 113 inputs control information to the traffic management unit 114 when receiving UL Grant such as dynamic scheduling or SPS. Also, when the configuration control information is received by RRC, the transmission parameter storage unit 113 holds these control information until data transmission by contention based wireless communication technology is performed. The control information of the configuration held by the transmission parameter storage unit 113 will be described later.

  The traffic management unit 114 receives a bit string of transmission data, receives control information when receiving UL Grant, and controls control information for a configuration based on contention-based wireless communication technology in advance, if any. Information is also input. The traffic management unit 114 may also receive the type of transmission data, QoS, and the like. The traffic management unit 114 selects the use of the contention based or non-contention based wireless communication technology from the input information, and transmits the transmission parameters of the selected wireless communication technology to the error correction coding unit 101, the modulation unit 102, and the transmission The signal generation unit 103, the signal multiplexing unit 104, and the identification signal generation unit 115 are input, and the data bit string is input to the error correction encoding unit 101.

The error correction coding unit 101 encodes an error correction code on the input data bit string. As the error correction code, for example, a turbo code, a low density parity check (LDPC) code, a convolutional code, a polar code or the like is used. The type and coding rate of the error correction code applied by the error correction coding unit 101 may be determined in advance by the transmitting / receiving apparatus, may be input from the traffic management unit 114, or may be based on contention or non- It may be switched by contention based wireless communication technology. When the type of error correction coding and the coding rate are notified as control information, the information is input from the traffic management unit 114 to the error correction coding unit 101. Also, the error correction coding unit 101 may perform puncturing (interleaving) or interleaving (reordering) of the coded bit sequence according to the coding rate to be applied. When performing interleaving of the encoded bit sequence, the error correction encoding unit 101 performs interleaving that is different for each terminal apparatus. Also, the error correction coding unit 101 may apply scrambling. Here, the scrambling may be applied only when the base station apparatus can uniquely identify the scrambling pattern used by the terminal apparatus by an identification signal described later. Also, a spreading code may be used for coded bits obtained by error correction coding. Spreading codes may be used at all coding rates used in data transmission, or only specific coding rates may be used. An example of using a spreading code only at a specific coding rate is to transmit data at a coding rate lower than the coding rate when transmitting all the coded bits obtained by error correction coding (even if it is a turbo code For example, if it is less than 1/3, the spreading code is used. In addition, even if switching is performed such as using a spreading code at the time of low coding rate data transmission by contention based wireless communication technology and not using the spreading code at low coding rate data transmission by non-contention based wireless communication technology. good.

The modulation unit 102 receives modulation scheme information from the traffic management unit 114, and modulates the coded bit sequence input from the error correction coding unit 101 to generate a modulation symbol sequence. Examples of the modulation method include QPSK (Quaternary Phase Shift Keying), 16 QAM (16-ary Quadrature Amplitude Modulation; 16 quadrature amplitude modulation) 64 QAM, 256 QAM, and the like. Alternatively, the modulation scheme may not be gray labeling, and set partitioning may be used. Also, GMSK (Gaussian Minimum-Shift Keying) may be used. Modulating section 102 transmits the generated modulation symbol sequence to transmission signal generating section 1.
Output to 03. Here, the modulation method or modulation method may be determined in advance by the transmission / reception device, may be input from the traffic management unit 114, or may be switched by contention based or non-contention based wireless communication technology. good. Alternatively, a spreading code may be used. It means applying to the modulation symbol sequence without applying the spreading code to the coded bit sequence after error correction coding. A spreading code may be used with all modulation multilevel numbers (number of bits included in one modulation symbol) or coding rate used in data transmission, or all MCS (Modulation and Coding Scheme, modulation multilevel number and encoding A spreading code may be used as a combination of rates, or a spreading code may be used as a specific modulation multi-level number or a specific coding rate, or a specific MCS. An example of using a spreading code with a specific modulation multilevel number uses the spreading code only at the time of data transmission of BPSK or QPSK. An example of using a spreading code at a specific coding rate is only to transmit data at a coding rate lower than the coding rate in the case of transmitting all coded bits obtained by error correction coding (even if it is a turbo code For example, if it is less than 1/3, the spreading code is used. An example of using a spreading code at a specific MCS is only to transmit data at a coding rate lower than the coding rate in the case of transmitting all of the coded bits obtained by BPSK or QPSK and error correction coding (turbo code (If it is less than 1/3) then we use a spreading code. Also, switching may be performed such as using a spreading code at the time of data transmission of a low coding rate by contention based wireless communication technology and not using the spreading code at the time of data transmission by non-contention based wireless communication technology.

  7 to 10 show an example of the configuration of the transmission signal generation unit 103 according to the present embodiment. In FIG. 7, the DFT unit 1031 performs discrete Fourier transform on the input modulation symbol to convert a time domain signal into a frequency domain signal, and outputs the obtained frequency domain signal to the signal assignment unit 1032. The signal assignment unit 1032 receives resource assignment information, which is information on one or more RBs (Resource Blocks) used for data transmission, from the traffic management unit 114, and assigns a transmission signal in the frequency domain to the designated RB. The resource allocation information input from the traffic management unit 114 is notified by UL Grant in the case of non-contention based wireless communication technology, and notified in advance by configuration control information in the case of contention based wireless communication technology. . Here, 1 RB is defined by 12 subcarriers and 1 slot (7 OFDM symbols), and resource allocation information is information for allocating 1 subframe (2 slots). However, in LTE, one subframe is 1 msec and subcarrier spacing is 15 kHz, but one subframe time and subcarrier spacing is 4 msec, 3.75 kHz, 2 msec, 7.5 kHz or 0.2 msec, 75 kHz or It may be different, such as 0.1 msec or 150 kHz, and resource allocation information may be notified in units of subframes even with different frame configurations. Also, the resource allocation information may notify allocation of a plurality of subframes regardless of whether it is the same as the subframe configuration of LTE or different from the subframe configuration of LTE, or may be allocated in slot units. The notification may be made, the allocation in units of OFDM symbols may be notified, or the allocation in units of multiple OFDM symbols, such as in units of 2 OFDM symbols, may be notified. Also, the resource allocation information may not be in RB units but may be in one subcarrier unit, in RBG (Resource Block Group) units composed of a plurality of RBs, and may be allocated to one or more RBGs. Also, the resource allocation information is not limited to continuous RBs or continuous subcarriers, but may be non-continuous RBs or non-continuous subcarriers. Also, the terminal apparatus may use only part of RBs and subcarriers indicated by the resource allocation information for data transmission. In this case, the base station apparatus needs to be able to notify in advance of information on RBs and subcarriers used by the terminal apparatus for data transmission or to detect from other signals.

In an example of the configuration of transmission signal generation section 103 shown in FIG. 8, phase rotation section 1030 performs phase rotation on the input modulation symbol. The phase rotation given to the data signal in the time domain in the phase rotation unit 1030 uses the pattern input from the traffic management unit 114 in order to apply different patterns for each terminal apparatus. An example of the pattern of phase rotation is a pattern in which phase rotation is different per modulation symbol. It is assumed that the terminal apparatus and the base station apparatus are shared by a pattern of phase rotation input by the traffic management unit 114, as notified by UL Grant, or notified in advance by configuration control information. The DFT unit 1031 and the signal assignment unit 1032 are the same as in FIG. Here, FIG. 8 shows an example in which phase rotation is given to the data signal in the time domain, but the same effect may be obtained by different methods. For example, different cyclic delays may be given to the signals in the frequency domain obtained by the DFT unit 1031 for each terminal apparatus. Specifically, when the signals in the frequency domain not cyclically delayed of the terminal device 20-u are S _U (1), S _U (2), S _U (3), S _U (4), the terminal device 20- The cyclic delay of one symbol of delay amount is given to _i , and S _i (4), S _i (1), S _i (2), S _i (3), and so on.

The DFT unit 1031 and the signal assignment unit 1032 in FIG. 9 are the same as those in FIG. The phase rotation unit 1033 performs phase rotation on the data signal in the frequency domain obtained by the DFT unit 1031. The phase rotation given to the data signal in the frequency domain in the phase rotation unit 1033 uses a pattern input from the traffic management unit 114 in order to apply a different pattern for each terminal apparatus. An example of the pattern of phase rotation is to make phase rotation different in units of data signal (subcarrier unit) in the frequency domain. The pattern of phase rotation input by the traffic management unit 114 is information shared by the terminal apparatus and the base station apparatus by being notified by UL Grant, or notified in advance by configuration control information, or the like. Here, FIG. 9 shows an example in which phase rotation is given to the data signal in the frequency domain, but the same effect may be obtained by different methods. For example, a different cyclic delay may be given to the modulation symbol before conversion to the frequency domain signal by the DFT unit 1031 for each terminal apparatus. Specifically, in the case where the signals of the terminal device 20-u in the time domain without cyclic delay are s _U (1), s _U (2), s _U (3), s _U (4), the terminal device 20- For example, s _i (4), s _i (1), s _i (2), s _i (3), etc. are given to the cyclic delay of the delay amount 1 to _i . Also, both of the phase rotation unit 1030 and the phase rotation unit 1033 in FIGS. 8 and 9 may be used. The transmission signal generation unit 103 in FIGS. 7 to 9 inputs the transmission signal to the signal multiplexing unit 104.

  The configuration of the transmission signal generation unit 103 may be the configuration of FIG. In this example, the transmission signal generation unit 103 interleaves (sorts) the modulation symbols input before the DFT unit 1031 (interleaving unit 1034). When interleaving is performed on modulation symbols, interleaving is performed which is different for each terminal. The present invention is not limited to the example using interleaves that are different and different for each terminal shown in FIG. 10, and even if interleaves different for each terminal are performed on the encoded bit string obtained from the error correction code unit 101. good. In addition, when data transmission is performed at a low coding rate using a spreading code, interleaving may be used in which different spreading codes are applied to different terminal devices after application, or different spreading codes may be used for different terminal devices before application Interleaving may be used.

  FIG. 11 shows an example of the configuration of the signal multiplexing unit 104 according to the present embodiment. The transmission signal input from transmission signal generation section 103 is input to reference signal multiplexing section 1041. Also, the traffic management unit 114 inputs a parameter for generating a reference signal to the reference signal generation unit 1042, and inputs control information to be transmitted to the base station apparatus to the control information generation unit 1044. The reference signal multiplexing unit 1041 multiplexes the input transmission signal and the reference signal sequence (DMRS) generated by the reference signal generation unit. By multiplexing the transmission signal and the DMRS in this manner, the frame configuration of FIG. 4 is generated. The frame configuration of FIG. 5 will be described later. However, the reference signal multiplexing unit 1041 may multiplex the data signal and the reference signal in the time domain, when arranging in an OFDM symbol different from the data signal as in the frame configuration of FIG. 4.

On the other hand, the control signal generation unit 1044 performs PUCCH (Physical Uplink Control CHannel).
Channel quality information (CSI: Channel State Information), SR (Scheduling Request), and ACK / NACK (Acknowledgement / Negative Acknowledgment) of uplink control information to be transmitted are generated and output to control information multiplexing section 1043. The control information multiplexing unit 1043 multiplexes control information on a frame configuration configured by the data signal and the reference signal. The signal multiplexing unit 104 inputs the generated transmission frame to the IFFT unit 105. However, when the terminal apparatus can not simultaneously transmit PUSCH and PUCCH (when there is no capability of simultaneous transmission), only a signal with high priority is transmitted according to a predetermined signal priority. Also, although the terminal apparatus is capable of simultaneous transmission of PUSCH and PUCCH (when there is the capability of simultaneous transmission), it is similarly determined in advance if PUSCH and PUCCH can not be simultaneously transmitted due to insufficient transmission power of the terminal apparatus. Only high priority signals are transmitted according to the priority of the existing signals. The priority of transmission of signals may be different in contention-based wireless communication technology and non-contention-based wireless communication technology. Also, priority may be present for data to be transmitted, and the priority of PUSCH may be changed depending on the priority.

The IFFT unit 105 receives a transmission frame in the frequency domain and converts the frequency domain signal sequence into a time domain signal sequence by performing inverse fast Fourier transform on each OFDM symbol basis. The IFFT unit 105 inputs the time domain signal sequence to the identification signal multiplexing unit 106. The identification signal generation unit 115 generates a signal to be transmitted in the subframe for the identification signal in FIG. 5 and inputs the signal to the identification signal multiplexing unit 106. Details of the identification signal will be described later. Identification signal multiplexing section 106 multiplexes a time domain signal sequence and an identification signal in different subframes as shown in FIG. 5, and inputs the multiplexed signal to transmission power control section 107. However, the identification signal may be multiplexed in different OFDM symbols or in different slots in the same subframe as the data signal. Transmission power control section 107 performs transmission power control using only an open loop transmission power control value or both an open loop and a close loop transmission power control value, and transmits a signal sequence after transmission power control to transmission processing section 108. Enter in The transmission processing unit 108 inserts a CP into the input signal sequence, converts the signal into an analog signal by D / A (Digital / Analog; digital / analog) conversion, and converts the converted signal into a radio frequency used for transmission. Up convert. The transmission processing unit 108 amplifies the up-converted signal by PA (Power Amplifier), and transmits the amplified signal via the transmission antenna 109. As described above, the terminal device transmits data. When the terminal apparatus performs FIG. 7 in the transmission signal generation unit 103, it means transmitting a DFTS-OFDM (also called discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing, SC-FDMA) signal. When the terminal apparatus performs FIG. 8 or FIG. 9 by the transmission signal generation unit 103, it means transmitting a signal in which phase rotation or cyclic delay is applied to DFTS-OFDM. When the terminal apparatus performs FIG. 10 in the transmission signal generation unit 103, it means transmitting a DFTS-OFDM signal using interleaving specific to the terminal apparatus. Further, in the case where the terminal apparatus does not perform DFT in the transmission signal generation unit 103, that is, in a configuration in which the DFT unit 1031 is not present in any of FIGS. Also, the terminal apparatus may use the above method in the transmission signal generation unit 103, or may use a different spreading method or a waveform generation method of different transmission signals.

  An example of a structure of the base station apparatus which concerns on FIG. 12 at this embodiment is shown. As shown in the figure, the base station apparatus receives data transmitted by the terminal apparatus with N receiving antennas 201-1 to 201-N, and inputs the data to the reception processing units 202-1 to 202-N. The reception processing units 202-1 to 202-N down convert the received signal to a baseband frequency, perform A / D conversion, and remove the CP from the digital signal. The reception processing units 202-1 to 202-N output the signals after CP removal to the identification signal separation units 203-1 to 203-N. The identification signal separation units 203-1 to 203-N separate the identification signal and the other signals, and output them to the transmission terminal identification unit 211 and the FFT units 204-1 to 204-N, respectively. The transmission terminal identification unit 211 identifies a terminal apparatus that has transmitted data from an identification signal described later, and outputs information on the transmission terminal apparatus to the channel estimation unit 207 and the signal separation units 205-1 to 205-N. The FFT units 204-1 to 204-N convert the received signal sequence input from time domain signal sequence to frequency domain signal sequence by fast Fourier transform, and the frequency domain signal sequence is signal separation units 205-1 to 205-N. Output to

The signal separation units 205-1 to 205-N all have a common configuration, and FIG. 13 illustrates an example of the configuration of the signal separation unit 205-1 according to the present embodiment. As shown in the figure, in the signal separation unit 205-1, the frequency domain signal sequence is input from the FFT unit 204-1 to the reference signal separation unit 2051, and information on the transmission terminal apparatus identified by the transmission terminal identification unit 211 is input. . The reference signal separation unit 2051 separates the frequency domain signal sequence into the reference signal and the other signals using the information of the input transmission terminal apparatus, and outputs them to the propagation path estimation unit 207 and the control information separation unit 2052, respectively. The control information separation unit 2052 separates the input signal into a control signal and a data signal, and outputs the control signal and the data signal to the control information detection unit 2054 and the assignment signal extraction unit 2053, respectively. The control information detection unit 2054
A signal transmitted on the PUCCH is detected, SR is used for uplink scheduling, CSI is used for downlink scheduling, and ACK / NACK is used for downlink transmission retransmission control, so that the information is output to the control information generation unit 208. On the other hand, the assignment signal extraction unit 2053 extracts the transmission signal for each terminal device based on the resource assignment information notified to the terminal device by the control information.

The channel estimation unit 207 receives information of a transmitting terminal apparatus identified as a DMRS (De-Modulation Reference Signal), which is a reference signal multiplexed and transmitted with a data signal, estimates a frequency response, and is used for demodulation. The estimated frequency response is output to the signal detection unit 206. Also, when SRS (Sounding Reference Signal) is input, propagation path estimation section 207 estimates a frequency response to be used in the next scheduling. The control information generation unit 208 performs uplink scheduling and adaptive modulation and coding (also referred to as link adaptation) based on the frequency response estimated by DMRS or SRS, and the terminal apparatus performs uplink transmission. Generate transmission parameters to be used and convert them into DCI format. Further, when information on the presence or absence of an error in the received data signal is input from the signal detection unit 206, the control information generation unit 208 generates control information for notifying ACK / NACK in uplink transmission. Here, ACK / NACK in uplink transmission is transmitted by at least one of PHICH (Physical HARQ CHannel), PDCCH, and EPDCCH. The control information transmission unit 209 receives the control information converted from the control information generation unit 208, assigns the input control information to the PDCCH or EPDCCH, and transmits the allocated control information to each terminal apparatus.

  FIG. 14 shows an example of the configuration of the signal detection unit 206 according to the present embodiment. The signal detection unit 206 inputs the signal for each terminal apparatus extracted by the signal separation units 205-1 to 205-N to the cancellation processing unit 2061. The cancel processing unit 2061 receives the soft replica from the soft replica generation unit 2067, and performs cancellation processing on each received signal. The equalization unit 2062 generates an equalization weight based on the MMSE criterion from the frequency response input from the propagation path estimation unit 207, and multiplies the signal after soft cancellation. Equalization section 2062 outputs the signal for each terminal apparatus after equalization to IDFT sections 2063-1 to 2063-U. The IDFT units 2063-1 to 2063-U convert the reception signals after equalization in the frequency domain into time domain signals. If the terminal equipment performs cyclic delay, phase rotation, or interleaving on the signal before or after DFT in transmission processing, cyclic delay, phase rotation, or interleaving is performed on the received signal or time-domain signal after frequency domain equalization. Processing to be restored is performed. Although not shown, demodulation sections 2064-1 to 2064-U receive information of a modulation scheme notified in advance or determined in advance, and perform demodulation processing on the reception signal sequence in the time domain, Obtain LLR (Log Likelihood Ratio) of a bit sequence, that is, an LLR sequence.

Although not illustrated, the decoding units 2065-1 to 2065-U receive information on coding rates that are notified in advance or determined in advance, and perform decoding processing on LLR sequences. Here, in order to perform cancellation processing such as successive interference canceller (SIC: Successive Interference Canceller), parallel interference canceller (PIC: Parallel Interference Canceller), and turbo equalization, the decoding units 2065-1 to 2065-U are decoders. The output external LLRs or the posterior LLRs are output to the symbol replica generation units 2066-1 to 2066-U. The difference between the external LLR and the a posterior LLR is whether or not the preliminary LLRs input to the decoding units 2065-1 to 2065-U are subtracted from the LLRs after decoding, respectively. When the terminal apparatus performs puncturing (interleaving), scrambling, or the like on the coded bit sequence after error correction coding in transmission processing, the signal detection unit 206 inputs the decoded bit sequence to the decoding units 2065-1 to 2065-U. De-puncture (0 is inserted into LLRs of decimated bits), de-interleaving (reordering), and descrambling are performed on the LLR sequence. The symbol replica generation units 2066-1 to 2066-U generate symbol replicas according to the modulation scheme used by the terminal device for data transmission of the input LLR sequence, and output the symbol replicas to the soft replica generation unit 2067. The soft replica generation unit 2067 converts the input symbol replica into a frequency domain signal by DFT, and generates a soft replica by multiplying the frequency response. The decoding units 2065-1 to 2065-U make a hard decision on the LLR sequence after decoding when the number of repetitions of SIC or PIC processing or turbo equalization reaches a predetermined number, and performs cyclic redundancy check (CRC: Cyclic Redundancy) Based on Check, the presence or absence of an error bit is determined, and information on the presence or absence of an error bit is output to the control information generation unit 208. When signal detection by SIC is performed, ordering processing may be used which detects signals from terminals with high reception quality without repeated processing. In addition, when performing signal detection by PIC, repetitive processing may be applied. Here, when data transmitted at a low coding rate using a spreading code is received, the signal detection unit 206 performs despreading. Also, the symbol replica generation units 2066-1 to 2066-U generate symbol replicas according to the spreading code and modulation scheme used by the terminal device.

FIG. 15 shows an example of the configuration of the identification signal of the transmission terminal device according to this embodiment. Here, it is assumed that the number of OFDM symbols usable for transmission of the identification signal is N _OFDM and the number of subcarriers usable for transmission of the identification signal is N _SC . Furthermore, the number of OFDM symbols used by each transmitting terminal to transmit an identification signal is T _OFDM , and when using an OCC (Orthogonal Cover Code) in the time direction, an OCC sequence of length T _OCC is used. However, the OCC sequence length may be 1 ≦ T _OCC ≦ T _OFDM , as long as information on the OCC sequence length to be used between transmitting and receiving devices can be shared in advance. Also, let T _SC be the number of subcarriers used by each transmitting terminal apparatus for transmitting the identification signal. When CS (Cyclic Shift) is used in the frequency direction, the CS pattern number T _CS is used, and when IFDMA (Interleaved Frequency Division Multiple Access) is used, the multiple pattern number T _RF is used. Therefore, the number of orthogonal resources for the identification signal is (N _OFDM / T _OFDM ) × T _OCC × (N _SC / T _SC ) × T _CS × _TRF . FIG. 15 shows an example in the case where the time-frequency resource capable of transmitting an identification signal is one subframe (N _OFDM = 14), the number of subcarriers N _SC , and T _OFDM = T _OCC = 2. It is not limited to the example. In the case of this figure, assuming that N _SC = T _SC = 48, T _CS = 12 and T _RF = 2, it means that there are 336 orthogonal resource numbers. The control information of the configuration transmitted by the base station apparatus includes information indicating orthogonal resources for transmitting an identification signal. The OFDM symbol set is defined as T1 to T7 for every two consecutive OFDM symbols as shown in FIG. 15, and the index I _T of the OFDM symbol set actually used is N _SC > T _SC , as shown in FIG. information of subcarrier sets to field use is defined as X number is the F1～FX, an index I _F of the sub-carrier set to be actually used, the index of the OCC sequences used as I _OCC, the CS pattern used I _{Let CS} be the multiplexing pattern of IFDMA to be used be I _RF . In this case, the configuration control information transmitted by the base station apparatus includes information uniquely indicating (I _T , I _F , I _OCC , I _CS , I _RF ). The control information of configuration may be information including only a part of (I _T , I _F , I _OCC , I _CS , I _RF ). However, the OFDM symbol set does not have to be consecutive OFDM symbols, and may be a combination such as OFDM symbol # 1 and OFDM symbol # 8. Also, may not be a sub-carrier also continuous in the sub-carrier set may be used for non-continuous on the frequency axis a cluster of a plurality of identification signals is an integral multiple of the example T _RF as a cluster identification signal. Further, subcarriers S # 1 to S # N _SC usable for transmission of the identification signal may be the same as or different from the subcarriers for data transmission. When the subcarriers usable for transmission of the identification signal are different from the subcarriers for transmitting data, the subcarriers for transmitting the identification signal and the data signal may be partially overlapped. When the number of terminal devices accommodated in the base station device exceeds the number of orthogonal resources of the identification signal, the same orthogonal resources need to be allocated to different terminal devices in duplicate. In this case, in addition to the orthogonal resources of the identification signal, it is necessary to identify the transmitting terminal apparatus by an identifier unique to the terminal apparatus. Specifically, the CRC added to the data signal is subjected to an exclusive OR operation using a cell-radio network temporary identifier (C-RNTI) or an SPS C-RNTI, which is an ID unique to the terminal device. By doing this, the base station apparatus on the receiving side performs exclusive OR operation of a plurality of identifiers and CRC after signal detection by SIC, PIC, or turbo equalization, and confirms an identifier in which no error is detected by CRC. By doing this, it is possible to identify the transmitting terminal device.

FIG. 16 shows an example of frequency resources used for uplink data transmission according to the present embodiment. This figure shows an example of using different frequency resources for each terminal apparatus with respect to frequency resources that can be used for data transmission of contention based radio access technology. Hereinafter, an example in which the frequency index on the horizontal axis is a subcarrier number will be described. In FIG. 16, UE # 1 to UE # Nm of the terminal apparatus that transmits data based on contention-based radio access technology exist, and the subcarrier index that can be used for data transmission on contention-based radio access technology is # 1 to # 1. 12, S (u, i) represents a signal of the i-th frequency domain of UE # u. In this example, UE # 1 uses all available subcarriers, transmits data with DFTS-OFDM signals, and UEs # 2 through # 8 use non-consecutive and equally spaced subcarriers of DFTS-OFDM signals. Is an example of transmitting data using. As described above, by using different frequency resources for each terminal apparatus that transmits data based on contention-based radio access technology, even if a plurality of terminal apparatuses transmit data in the same subframe, only a part of the frequency resources can be used. Collision, and the amount of interference decreases. In addition, by using subcarriers of the DFTS-OFDM signal at equal intervals, PAPR (Peak to Average Power Ratio) characteristics become better as compared to assignment of signals not at equal intervals. In particular, in uplink data transmission, there is a problem such as a narrow coverage when transmission power decreases due to back-off to suppress transmission characteristic deterioration due to non-linear distortion during amplification by PA and non-linear distortion, so good PAPR characteristics Data transmission is important. As described above, data transmission as shown in FIG. 16 is effective in terms of interference and PAPR characteristics at the time of collision of data signals transmitted by a plurality of terminal devices.

  In addition, although the frequency resource which can be used for data transmission of the contention based radio | wireless access technology was demonstrated as 12 subcarriers, this invention is not limited to this example, A plurality of 12 subcarriers are made into one access area You may prepare the access area of. For example, by accommodating different terminal devices in each access area, by preparing X access areas, the number of terminal apparatuses X times Nm can be accommodated. Further, in the present invention, the frequency index on the horizontal axis in FIG. 16 is not limited to the subcarrier number, and may be an RB number or an RBG number.

  FIG. 17 shows an example of frequency resources used for uplink data transmission according to the present embodiment. The figure shows that the DFTS-OFDM signal can be used as continuous subcarriers or non-continuous for some frequency resources with respect to subcarrier indexes # 1 to 12 that can be used for data transmission of contention based radio access technology. And it is an example which allocates data to subcarriers at equal intervals and transmits. In this example, although the case where subcarrier index divides | segments by # 1-6 and # 7-12 is shown, it is good also as a different division method. For example, the subcarrier to be used may be divided into three or more and used together with frequency division multiplexing. Since each terminal transmits such data, the same effect as that of FIG. 16 can be obtained in terms of PAPR characteristics, and the amount of data transmitted by a plurality of terminals is smaller than that in FIG. Become. In addition, although the frequency resource which can be used for data transmission of the contention based radio | wireless access technology was demonstrated as 12 subcarriers, this invention is not limited to this example, A plurality of 12 subcarriers are made into one access area You may prepare the access area of. For example, by accommodating different terminal devices in each access area, by preparing X access areas, the number of terminal apparatuses X times Nm can be accommodated. Further, in the present invention, the frequency index on the horizontal axis in FIG. 17 is not limited to the subcarrier number, and may be an RB number or an RBG number.

FIG. 18 shows an example of frequency resources used for uplink data transmission according to the present embodiment. This figure shows that the DFTS-OFDM signal can be used as continuous subcarriers or non-consecutive non-uniform subcarriers with subcarrier index # 1 to 12 that can be used for data transmission of contention based radio access technology. Is an example of allocating and transmitting. In this example, various methods of using subcarriers can be used as compared with the case of transmitting data using non-consecutive and equally-spaced subcarriers. Therefore, when different frequency resources are used for each terminal apparatus, more frequency resource allocation patterns can be prepared, so the number of terminal apparatuses that can be accommodated can be significantly increased.

  FIG. 19 shows an example of frequency resources used for uplink data transmission and identification signal transmission according to the present embodiment. In the figure, subcarrier indexes # 1 to 12 that can be used for data transmission of contention based radio access technology, and D (u, i) indicate an identification signal of the i-th frequency domain of UE #u. In this example, data is allocated to continuous subcarriers or non-continuous and equally spaced subcarriers for subcarrier # 1 to 12 and transmitted. In this case, even if a plurality of terminal devices transmit data in the same subframe, a collision occurs only in a part of frequency resources, and DMRS orthogonalization becomes a problem. The conventional DMRS realizes orthogonalization in CS on the premise that a plurality of data signals are collided (multiplexed) on the same frequency resource in single-user MIMO, multi-user MIMO, or the like. However, when a collision occurs only in part of the frequency resources as shown in FIG. 19, orthogonalization by CS can not be performed, and orthogonalization is performed only by OCC of sequence length 2 and the number of terminal apparatuses that can be accommodated is two. It is limited to Therefore, the example of FIG. 19 shares the identification signal and the DMRS. That is, in order to realize channel estimation by the identification signal, in the frame configuration of FIG. 5, data is allocated without performing DMRS transmission with OFDM symbols # 4 and # 11 of data transmission subframes (subframes of UL transmission) . Therefore, the number of transmittable bits in one transmission opportunity increases. Further, in the present embodiment, the terminal apparatus changes the processing of the signal multiplexing unit 104 in FIG. The reference signal multiplexer 1041 and the reference signal generator 1042 generate DMRS and multiplex with the data signal, but in the contention-based (Grant Free) wireless communication technology, the reference signal multiplexer 1041 shares the identification signal and the DMRS. And the reference signal generation unit 1042 does nothing. However, when the terminal apparatus also uses non-contention based wireless communication technology, the reference signal multiplexing section 1041 and the reference signal generation section 1042 generate DMRS and data signals at the time of data transmission by the non-contention based wireless communication technology. Do multiplexing. Further, in the present embodiment, the base station apparatus changes the processing of the signal separation units 205-1 to 205-N in FIG. The reference signal separation unit 2051 separates the DMRS, but in the contention-based wireless communication technology, nothing is done since the identification signal and the DMRS are shared. However, when the terminal apparatus also uses non-contention based wireless communication technology, the reference signal separation unit 2051 performs DMRS separation at the time of data transmission by the non-contention based wireless communication technology.

  In this embodiment, when collision occurs only in part of the frequency resources as shown in FIG. 19, the identification signal uses subcarriers different from the subcarriers to which the data signal is allocated. Specifically, the identification signal uses all of subcarriers # 1 to 12 that can be used for data transmission of contention-based radio access technology, and the data signal is partially as shown in UE # 2 to Nm in FIG. Use only sub-carriers of. As shown in FIG. 19, when the subcarriers used for transmission of the identification signal coincide in UE # 1 to Nm, orthogonalization in CS becomes possible, and the number of terminal apparatuses that can be accommodated can be increased. In addition, although the frequency resource which can be used for data transmission of the contention based radio | wireless access technology was demonstrated as 12 subcarriers, this invention is not limited to this example, A plurality of 12 subcarriers are made into one access area You may prepare the access area of. For example, by accommodating different terminal devices in each access area, by preparing X access areas, the number of terminal apparatuses X times Nm can be accommodated. Further, in the present invention, the frequency index on the horizontal axis in FIG. 19 is not limited to the subcarrier number, and may be an RB number or an RBG number.

  Although the present invention shows an example in which the number of subcarriers used for transmitting the identification signal is larger than the number of subcarriers used for data transmission in the example of FIG. 19, the present invention is not limited to this. The number of subcarriers used for the identification signal may be smaller than the number of subcarriers used. Specifically, the subcarriers are divided into # 1 to 6 and # 7 to 12, and the terminal apparatus sets only subcarriers # 1 to 6 or # 7 to 12 to be used for transmitting the identification signal. Thereby, in UE # 1 of FIG. 19, the number of subcarriers used for the identification signal is smaller than the number of subcarriers used for data transmission. Further, subcarriers used by the terminal apparatus for transmission of the identification signal may be determined by allocation of subcarriers for transmitting data. For example, when transmitting data using subcarriers such as UE # 5 in FIG. 18, the number of subcarriers for data transmission for subcarriers # 7 to 12 is greater than for subcarriers # 1 to # 6. The signal may be transmitted on subcarriers # 7-12.

  As described above, in the present embodiment, in the contention-based wireless communication technology, even if a plurality of terminal devices transmit data in the same subframe by using different frequency resources for each terminal device, a part of the frequencies is transmitted. It will be a collision only with resources, and the amount of interference will be smaller. In addition, by using subcarriers of the DFTS-OFDM signal at equal intervals, PAPR characteristics become better as compared to assignment of signals not at equal intervals. As a result, an improvement in reception quality and an improvement in frequency utilization efficiency of the entire system can be realized, and a large number of terminals can be accommodated efficiently.

Second Embodiment
The second embodiment of the present invention reduces the amount of interference when data is transmitted by a plurality of terminal devices in the same subframe when data is transmitted in a part of OFDM symbols in the subframe in which the terminal device transmits data. An example will be described.

In this embodiment, the configuration example of the terminal apparatus is the same as in the first embodiment and is FIGS. 6, 7, 8, 9, 10, and 11, and the configuration example of the base station apparatus is also the same as in the first embodiment. 12, 13, and 14. Further, the sequence chart of data transmission of the terminal device is also the same as that of the first embodiment and is FIG. Therefore, in the present embodiment, only different processing will be described, and description of the same processing will be omitted. FIG. 20 shows an example of uplink identification signal and data transmission according to the present embodiment. The present embodiment is an example of transmitting the same data a plurality of times, and shows a case where the identification signal and the data are transmitted at each transmission opportunity. When the terminal apparatus transmits data by the contention based radio access technology, the unit for transmitting data in one subframe shown in FIG. 21 is divided into T1 to T21, and any one is used. Transmission segments T1 to T7 are for transmitting data with only 2 OFDM symbols in one subframe, transmission segments T8 to 11 are for transmitting data with only 3 OFDM symbols in one subframe, and transmission segments T12 to 15 are In this case, data transmission is performed using only four OFDM symbols in one subframe, transmission intervals T16 to T17 are data transmission using only five OFDM symbols in one subframe, and transmission intervals T18 to T19 are six OFDM in one subframe. This is a case where data transmission is performed using only symbols, and transmission intervals T20 to T21 are cases where data transmission is performed using only seven OFDM symbols (one slot) in one subframe. In such a case, when the terminal device transmits data using the contention based wireless access technology, data transmission of a plurality of terminal devices may collide only in a specific transmission interval. Therefore, the terminal apparatus may change the transmission interval for each data transmission among the number of OFDM symbols used for data transmission. For example, assuming that the subframe number for data transmission is 1 ≦ Nf ≦ 10, the number of selectable transmission intervals is Nd, the offset of transmission intervals 0 ≦ Noff ≦ Nd−1 given to each terminal apparatus, the amount of hopping of the transmission intervals 0 ≦ Nh ≦ Nd−
If it is 1, it can be calculated by mod (Nf × Nh + Noff, Nd) +1. When data transmission is performed using only two OFDM symbols in one subframe, Nd = 7, 1 to 7 are given by the above equation, and T1 to T7 can be selected. Similarly, 3O in one subframe
When data transmission is performed using only FDM symbols, Nd = 4, and 1 to 4 are given by the above equation, and T8 to T11 can be selected.

  When the terminal apparatus transmits data using contention-based radio access technology, the frequency resource used for each data transmission may be changed to reduce the probability of collision at the same frequency and time. That is, the frequency resource to be used may be changed in association with the subframe number for data transmission of the same data. For example, the allocation of the frequency resource to be used may be changed according to the subframe number at the time of data transmission as shown in FIG. In addition, when the data size to be transmitted is very small, it may be applied simultaneously to a part of OFDM symbols in one subframe (the number of OFDM symbols to be used is 13 or less) for data transmission. When using frequency resources, transmit data in slot units or in OFDM symbol units in a subframe. Also, at the time of retransmission, frequency resources and time resources (slot numbers and OFDM symbols) may be changed according to subframe numbers and slot numbers.

  The number of subframes for transmitting data and the identification signal in FIG. 20 does not have to be the same, and the subframe for transmitting data to one subframe for transmitting the identification signal as in the example of FIG. It is good also as two. The overhead may be reduced by thus increasing the number of subframes that can transmit data.

  In the present embodiment, an example in which the same data is transmitted a plurality of times has been described, but the present invention is not limited to this example. For example, even in the case of only one data transmission The time / frequency resource for data transmission may be changed according to the number.

  In the present embodiment, an example has been described in which time and frequency resources for data transmission are changed according to subframe numbers, but the invention is not limited to this example. For example, orthogonal resources of identification signals or DMRS sequences or orthogonal resources The time and frequency resources for data transmission may be changed in association with the above.

  The present invention is also applicable to the case where the transmission interval in one subframe is different for each terminal apparatus, or the number of frequency resources used for data transmission is different for each terminal apparatus.

  As described above, in the present embodiment, in the contention-based wireless communication technology, it is assumed that a plurality of terminal devices transmit data in the same subframe by changing the time / frequency resource in which the terminal device transmits data according to the subframe number. Also, the collision occurs only with some time and frequency resources, and the amount of interference decreases. As a result, an improvement in reception quality and an improvement in frequency utilization efficiency of the entire system can be realized, and a large number of terminals can be accommodated efficiently.

Third Embodiment
In the third embodiment of the present invention, predicted traffic information such as the frequency of occurrence of data unique to a terminal device and the predicted data amount is transmitted, and control information of configuration is transmitted according to the predicted traffic information received by the base station device. An example will be described.

In this embodiment, the configuration example of the terminal apparatus is the same as in the first embodiment and is FIGS. 6, 7, 8, 9, 10, and 11, and the configuration example of the base station apparatus is also the same as in the first embodiment. 12, 13, and 14. Therefore, in the present embodiment, only different processing will be described, and description of the same processing will be omitted. A sequence chart of data transmission of the terminal device is shown in FIG. In FIG. 23, the base station apparatus transmits control information of a configuration that does not change depending on the state and capability of the terminal apparatus, and QoS (S300). For example, there are transmission of CSI, transmission of DMRS in data transmission subframe, transmission of SRS, and the like. Next, the terminal device transmits predicted traffic information (S301). The predicted traffic information includes the frequency of occurrence of predicted data (average occurrence cycle), the amount of transmission data (average value of predicted data amount, maximum value, etc.), required data rate, and reception quality (required). Packet error rate) may be included. Also, the terminal device may transmit the Capability and the UE category together with the predicted traffic information. For Capability, information on whether HARQ can be used, information on whether the closed loop control value of transmission power control can be used, information on whether fractional transmission power control can be used, information on whether SRS can be transmitted, the number of transmit / receive antennas Also, information on the number of antennas that can be used simultaneously may be included. The UE category includes a data rate (transmittable data rate) supported by the terminal apparatus, a buffer size, and the like.

  The terminal apparatus may transmit information of predicted traffic a plurality of times instead of transmitting it once at initial connection, handover or the like. For example, when a change occurs from the predicted traffic information transmitted by the terminal device, the information of the predicted traffic may be transmitted. For example, the predetermined amount of change may be determined in advance, and the predicted traffic information may be transmitted when the frequency of occurrence of predicted data and the amount of transmission data increase or decrease beyond the predetermined amount of change. Also, the terminal device may periodically transmit information on predicted traffic.

  After receiving the predicted traffic information from the terminal device, the base station device transmits control information of a configuration according to the received information (S302). For example, there are frequency resources (frequency position, bandwidth), MCS (Modulation and Coding Scheme), cell specific and terminal device specific target reception. When the terminal apparatus has a plurality of transmission antennas, the number of transmission layers (rank number), MCS for each layer (or each codeword), and precoding information may also be included. In the following, S201-1 to S202 in FIG. 3 are the same as in FIG.

  The frequency resource (frequency position, bandwidth) included in the control information of the configuration transmitted by the base station apparatus based on the predicted traffic information may be determined for each terminal apparatus. That is, a plurality of access areas (frequency positions, bandwidths) in which the base station apparatus accommodates the terminal apparatus by the contention based wireless communication technology may be prepared, or different access areas may be designated for each terminal apparatus. As a method of determining an access area to be notified to each terminal apparatus, terminals having the same transmission data amount, necessary data rate, and transmission quality may be set as the same access area. Also, the base station apparatus may transmit configuration control information such that the terminal apparatuses accommodated in the same access area use the same MCS for data transmission. In this case, when it is necessary to change the MCS based on the information on the predicted traffic of the terminal apparatus, the control information on the configuration may be transmitted again, and the access area may be changed simultaneously with the change of the MCS.

  Note that the terminal device may transmit or periodically transmit remaining transmission power (PH: Power Headroom) simultaneously with the predicted traffic information. In this case, the base station apparatus may set the MCS according to the PH. Also, the base station apparatus may transmit control information of a configuration to change the MCS or the access area when the PH transmitted from the terminal apparatus changes significantly compared to the previous PH.

  In the present embodiment, an example has been described in which the base station apparatus individually transmits DMRS information and MCS information. However, the DMRS sequence or orthogonal resources may be associated with a coding rate for notification.

As described above, in the present embodiment, in the contention based wireless communication technology, the base station apparatus controls the access area, the MCS, and the like by the predicted traffic information transmitted by the terminal apparatus, whereby an efficient contention based Wireless communication can be realized. As a result, an improvement in reception quality and an improvement in frequency utilization efficiency of the entire system can be realized, and a large number of terminals can be accommodated efficiently.

Fourth Embodiment
In the fourth embodiment of the present invention, an example will be described in which the terminal apparatus switches the spread / non-spread code application status and transmits data using non-consecutive and equally spaced subcarriers (interlaced).

  An example of a structure of the terminal device which concerns on FIG. 24 at this embodiment is shown. In the figure, the diffusion unit 301 is added to FIG. 6, and the other blocks have the same configuration. Further, the sequence chart of data transmission of the terminal device is also the same as that of the first embodiment and is FIG. Hereinafter, different processes will be mainly described, and the description of the same processes will be omitted. Spreading section 301 receives a time domain signal sequence from IFFT section 105 and performs code spreading in units of OFDM symbols. However, whether or not the spreading code is applied is notified in advance as configuration information from the base station apparatus, and if the spreading code is applied and is present, the spreading unit 301 performs spreading processing. Further, the transmission signal generation unit 103 may have any of the configurations shown in FIGS. 7 to 10, and includes a signal allocation unit 1032. The signal allocation unit 1032 may use equally-spaced subcarriers at different intervals for each terminal apparatus as shown in FIG. 16 as in the previous embodiment. In addition, continuous subcarriers such as the terminal device UE # 1 may be used. However, in data transmission of contention-based wireless communication technology, not all terminal devices transmit data in the same subframe, and thus, with the terminal device UE # 1 (using continuous subcarriers) of FIG. When the terminal apparatus UE # 2 (interlaced (non-consecutive and equally spaced subcarriers are used) transmits data in the same subframe, or the terminal apparatus UE # 2 (discontinuously and equally spaced in two subcarrier units) and the terminal apparatus There may be a case where UE # 4 (non-consecutive and at regular intervals in units of 4 subcarriers) transmits data in the same subframe. Therefore, there is a subframe in which none of the terminal devices UE # 1 to Nm shown in FIG. 16 transmit data, a subframe in which only one of the terminal devices transmits data, and a subframe in which two or more terminal devices transmit data. Also good. In addition, requested QoS and reception quality, MCS to be used, terminal category, Capability, FGI (Feature Group Indicator), terminal type (mMMTC terminal, ultra-reliable low delay communication terminal, large capacity high-speed communication terminal) The terminal devices may be grouped according to the above, and the interlace interval may be changed, or the interlace and the use of continuous subcarriers may be switched.

FIG. 25 shows an example of code spreading in units of OFDM symbols according to the present embodiment. In the figure, one frame is composed of ten subframes, and data transmission is performed in units of one subframe. Also, in this example, one subframe is composed of 14 OFDM symbols, and the first 2 OFDM symbols are signals other than data such as a reference signal. When the terminal apparatus performs data transmission in subframe units, as an example of performing spreading in OFDM symbol units, sequence lengths 2, 4 and 12 (corresponding to sequence lengths C, B and A of spreading codes in the figure) Spreading code is used to spread in time direction. Specifically, spreading section 301 copies the OFDM symbol by the sequence length of the spreading code, and multiplies the spreading code. However, the sequence length of the spreading code in the present invention is not limited to this example, and the sequence length of the spreading code may be 3 or 6. Examples of spreading codes to be applied are Walsh code, cyclic shift, Zadoff-Chu sequence, PN sequence, M sequence, Gold sequence and the like. Also, the spreading factor indicating the sequence length of the spreading code may be variable, for example, when using different spreading factors for each terminal, OVSF (Orthogonall
You may use a Variable Spreading Factor) code. Also, it may include a spreading code of sequence length 1 (that is, no spreading code is used).

Also, the base station apparatus may notify the spreading factor as control information (S200) of the configuration of FIG. For example, the base station apparatus may determine the spreading factor not on a per terminal basis but on a component carrier (CC: also called Component Carrier or Serving cell) unit. This is because the spreading factor is increased when the number of accommodated terminals is large when the number of terminal devices capable of contention-based data transmission accommodated by each component carrier is different, and the number of spreads when the number of accommodated terminals is small. You may lower the rate. Further, the unit for changing the spreading factor may be a base station apparatus unit, a subcarrier frequency unit, a subband unit such as a resource block group, or a resource block unit.

  FIG. 26 shows an example of the configuration of a base station apparatus according to this embodiment. In FIG. 12, despreading units 401-1 to 401-N are added to FIG. 12, and the other blocks have the same configuration. Hereinafter, different processes will be mainly described, and the description of the same processes will be omitted. The despreading units 401-1 to 401 -N receive the reception signal sequence from the identification signal separation units 203-1 to 203 -N, and perform despreading on the spread OFDM symbols. Specifically, the despreading units 401-1 to 401 -N combine after dividing the complex conjugate of the spreading code applied by the spreading unit 301 of the terminal apparatus. Therefore, when a plurality of terminals transmitting data in the same subframe use different spreading codes, the despreading process is performed for each terminal.

Also, spreading codes may be applied with a configuration of a terminal device different from that of FIG. An example of a structure of the terminal device which concerns on FIG. 27 at this embodiment is shown. The figure shows an example where a spreading section 501 is provided to spread modulation symbols with a spreading code. The diffusion unit 501 may apply the diffusion method as shown in FIG. 28 or FIG. FIG. 28 shows an example in which the columns T1 to T14 are units to which the DFT is applied, and the number of subcarriers N _SC and the number of OFDM symbols 14 are used for data transmission. In this case, spreading section 501 sets spreading factors 1, 2, 3, 4, 6, 8 and 12 (in the figure, spreading factors 7 and 2 are spreading codes respectively) to modulation symbols before DFT. Apply spreading (hereinafter referred to as intra-DFT spreading) such as sequence lengths D and E). As a result, 14 × N _SC time-domain signal sequences are obtained, and DFT is applied to each of the N _SC time-domain signal sequences. In FIG. 29, spreading is not performed in the columns of T1 to T14 for performing DFT (without intra DFT spreading), but spreading is performed across signals to be DFT (hereinafter referred to as inter DFT spreading). That is, in the example of the spreading factor 2, the signal sequence of T1 is copied to T2, and the spreading code is applied in units of columns.

  FIG. 30 illustrates an example of the configuration of the signal detection unit 206 according to the present embodiment. In the figure, despreading sections 601-1 to 601-U are added from FIG. 14 corresponding to the configuration of the terminal apparatus of FIG. In this case, the despreading units 601-1 to 602-U combine the time-domain signal sequences obtained by the IDFTs 2063-1 to 2063-U after multiplication by multiplying the complex conjugate of the spreading code used by each terminal apparatus. . Also, when generating replicas, the symbol replica generation units 2066-1 to 2066-U apply the spreading code applied by the terminal device.

  Further, as another application example of the spreading code, a configuration example as shown in FIG. 31 may be used. In the figure, a spreading unit 701 is provided, and a spreading code is applied to the coded bit sequence obtained by the error correction coding unit 101.

  As described above, in the present embodiment, in the contention based wireless communication technology, it is possible to select whether the terminal apparatus uses continuous subcarriers or uses in interlace, and further, the subcarrier used in data transmission in interlace. An interval can be set for each terminal device. In addition, since the spreading factor can be set for each terminal device or each base station device or each component carrier, flexible setting according to the number of terminal devices to be accommodated is enabled. As a result, when the number of terminal devices to be accommodated is large, the spreading factor is increased to decrease the transmission rate but instead the number of terminal devices capable of simultaneously transmitting data is increased, and when the number of terminal devices to be accommodated is small, the transmission rate is increased. And can realize efficient contention based wireless communication. As a result, an improvement in reception quality and an improvement in frequency utilization efficiency of the entire system can be realized, and a large number of terminals can be accommodated efficiently.

Fifth Embodiment
In the fifth embodiment of the present invention, an example in which resource allocation is set by information on a spreading code will be described.

  In this embodiment, the configuration examples of the terminal device are FIGS. 7, 8, 9, 10, 11, and 24, and the configuration example of the base station device is FIG. However, the terminal apparatus and the base station apparatus may be configured as shown in FIG. Further, in the present embodiment, the present invention may be applied to multicarrier transmission, and the transmission signal generation unit 103 of the terminal apparatus may be configured without the DFT unit 1031 as shown in FIGS. The signal detection unit 206 of the base station apparatus in that case may be configured without the FT units 2063-1 to 2063-U as shown in FIG. In the present embodiment, the configuration information (S200) transmitted by the base station apparatus in FIG. 3 is associated with information on subcarriers used for data transmission and information on a spreading code, and is transmitted. The sequence length of the spreading code is made the same in all the terminal devices, and 0 is included in the spreading code. That is, the terminal apparatus (for example, UE # 1) using continuous subcarriers as shown in FIG. 16 is a case where a spreading code not including 0 is assigned, and the terminal apparatus using subcarriers in interlace is 0. Is assigned, and non-zero spreading codes are equally spaced. UE # 2 is an example in which 0 is assigned to an even frequency index. In addition, the intervals of non-zero elements in the spreading code may be set to be different for each terminal device (for example, UE # 2 to UE # 8), and a plurality of terminal devices are identical in the contention based wireless communication technology. Even when data is transmitted in subframes, interference power is reduced. Also, the sequence length of the spreading code may be changed according to the number of 0 included in the spreading code. For example, as in the terminal devices UE # 2 and UE # 7 in FIG. 16, spreading codes may be assigned such that the intervals between non-zero elements in the spreading code are orthogonal between terminal devices of integral multiples.

  In the present embodiment, the application example in FIG. 16 is shown as an example of interlace, but the present embodiment may be used when using the subcarriers in FIGS. 17 and 19 or in the case where they are not equally spaced as in FIG. You may apply. The sequence of spreading codes to be applied may be different according to the number of elements whose spreading codes are not 0 in FIGS. In FIGS. 16 to 19, the spreading code sequence to be applied may be switched according to the number of elements whose spreading code is not 0. For example, if the number of non-zero elements is a value represented by a power of 2, it may be Walsh code, and otherwise it may use PN sequence, Gold sequence, M sequence or cyclic shift. Also, if the number of non-zero elements is 8 or less, it may be Walsh code, and if the number of non-zero elements is greater than 8, any of PN sequence, Gold sequence, M sequence, and cyclic shift may be used.

  As described above, in the present embodiment, in contention based wireless communication technology, subcarriers to be used are determined according to information on spreading codes. Furthermore, the sequence of the spreading code is switched according to the number of non-zero elements included in the spreading code. As a result, when the number of terminal devices to be accommodated is large, the number of terminal devices capable of simultaneously transmitting data is increased instead of reducing the number of subcarriers used by using a spreading code having many elements of 0, and the number of terminal devices to be accommodated is When the number is small, it is possible to use a spreading code with a small number of zero elements, increase the number of subcarriers used, and realize efficient contention-based wireless communication. Therefore, the improvement of reception quality and the improvement of the frequency utilization efficiency of the whole system can be realized, and a large number of terminals can be accommodated efficiently.

  The program that operates in the apparatus according to the present invention may be a program that controls a central processing unit (CPU) or the like to cause a computer to function so as to realize the functions of the embodiments according to the present invention. Information handled by a program or program is temporarily stored in volatile memory such as Random Access Memory (RAM) or nonvolatile memory such as flash memory, Hard Disk Drive (HDD), or other storage system.

  A program for realizing the functions of the embodiments according to the present invention may be recorded in a computer readable recording medium. It may be realized by causing a computer system to read and execute the program recorded in this recording medium. The "computer system" referred to here is a computer system built in an apparatus, and includes hardware such as an operating system and peripheral devices. The “computer-readable recording medium” is a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a medium for dynamically holding a program for a short time, or another computer-readable recording medium. Also good.

  Also, each functional block or feature of the apparatus used in the above-described embodiment may be implemented or implemented by an electric circuit, for example, an integrated circuit or a plurality of integrated circuits. Electrical circuits designed to perform the functions described herein may be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or the like. Programmable logic devices, discrete gates or transistor logic, discrete hardware components, or combinations thereof. The general purpose processor may be a microprocessor or may be a conventional processor, controller, microcontroller, or state machine. The electric circuit described above may be configured by a digital circuit or may be configured by an analog circuit. In addition, when advances in semiconductor technology have led to the advent of integrated circuit technology that replaces current integrated circuits, the present invention can also use new integrated circuits according to such technology.

  The present invention is not limited to the above embodiment. Although an example of the device has been described in the embodiment, the present invention is not limited thereto, and a stationary or non-movable electronic device installed indoors and outdoors, for example, an AV device, a kitchen device, The present invention can be applied to terminal devices or communication devices such as cleaning and washing equipment, air conditioners, office equipment, vending machines, and other household appliances.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included. Furthermore, the present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining the technical means respectively disclosed in different embodiments are also included in the technical scope of the present invention. Be Moreover, it is an element described in each said embodiment, and the structure which substituted the elements which show the same effect is also contained.

DESCRIPTION OF SYMBOLS 10 ... Base station apparatus 20-1-20-Nm ... Terminal apparatus 101 ... Error correction encoding part 102 ... Modulation part 103 ... Transmission signal production | generation part 104 ... Signal multiplexing part 105 ... IFFT part 106 ... Identification signal multiplexing part 107 ... Transmission Power control unit 108 Transmission processing unit 109 Transmission antenna 110 Reception antenna 111 Wireless reception unit 112 Control information detection unit 113 Transmission parameter storage unit 114 Traffic management unit 1030 Phase rotation unit 1031 DFT unit 1032 Signal Allocation unit 1033 Phase rotation unit 1034 Interleaver 1041 Reference signal multiplexing unit 1042 Reference signal generation unit 1043 Control information multiplexing unit 1044 Control information generation unit 201-1 to 201-N Reception antenna 202-1 to 202 -N: Reception processing unit 203-1 to 203-N: Identification signal separation unit 2 04-1 to 204-N: FFT unit 205-1 to 205-N: signal separation unit 206: signal detection unit 207: propagation path estimation unit 208: control information generation unit 209: control information transmission unit 210: transmission antenna 211 ... Transmission terminal identification unit 2051 Reference signal separation unit 2052 Control information separation unit 2053 Allocation signal extraction unit 2054 Control information detection unit 2061 Cancellation processing unit 2062 Equalization unit 2063-1 to 2063-U IDFT unit 2064 Demodulators 2065-1 to 2065-U Decoding units 2066-1 to 2066-U Symbol replica generation unit 2067 Soft replica generation unit 301 Diffusion unit 401-1 to 401-N Despreading Unit 501: Diffusion unit 601-1 to 601-U: Reverse diffusion unit 701: Diffusion unit

Claims (12)

A transmitter for transmitting data signals to a receiver, the transmitter comprising:
A transmission processing unit that transmits the data signal without receiving the transmission permission control information transmitted by the receiving device, an identification signal multiplexing unit that multiplexes an identification signal to an orthogonal resource, and transmission of the data signal continuously. A receiver for receiving in advance transmission parameters capable of indicating the use of various frequency resources and the use of non-continuous and equally-spaced frequency resources,
The transmission processing unit transmits the data using a first data transmission that transmits the data signal using the continuous frequency resource based on the transmission parameter, and using the non-consecutive and equally spaced frequency resource. And transmitting the data signal in any of the second data transmissions.   The transmission apparatus according to claim 1, wherein the transmission processing unit uses a third data transmission for transmitting the data signal using nonconsecutive and non-uniform frequency resources.   The transmitting apparatus according to claim 1, wherein the identification signal multiplexing unit multiplexes the identification signal on a frequency resource different from a frequency resource used for transmitting the data signal.   4. The transmission apparatus according to claim 3, wherein the identification signal multiplexing unit multiplexes the identification signal on the number of frequency resources larger than the number of frequency resources used for transmitting the data signal.   The transmission processing unit determines an OFDM symbol to be used according to a subframe number for transmitting the data signal, when using only a part of OFDM symbols in the subframe for transmitting the data signal. The transmitter according to 1).   The transmission processing unit may determine a slot to be used according to a subframe number for transmitting the data signal when only a part of OFDM symbols in the subframe is used for transmitting the data signal. The transmitter as described. A receiving device for receiving data signals of a plurality of transmitting devices, the receiving device comprising:
Reception processing unit that receives the data signal that is transmitted without transmitting transmission permission control information, an identification signal separation unit that separates an identification signal that is received along with the data from orthogonal resources, and data transmission from the identification signal A transmission terminal identification unit that identifies the transmission device that performed the transmission, and a control information transmission unit that transmits in advance transmission parameters used for the data transmission,
The transmission parameters transmitted by the control information transmission unit include information on frequency resources used for data transmission for each of the transmission devices, and information on the frequency resources is discontinuous and equally spaced with continuous use of frequency resources. A receiver characterized in that it can indicate the use of frequency resources.   The receiving apparatus according to claim 7, wherein the information on the frequency resource transmitted by the control information transmitting unit includes frequency resources which are discontinuous and not at regular intervals.   8. The information of the frequency resource used by the transmission apparatus to transmit the identification signal, which is included in the transmission parameter transmitted by the control information transmission unit, is different from the frequency resource used to transmit the identification signal. Receiving device.   The reception processing unit is characterized in that, when the transmission apparatus uses only a part of OFDM symbols in a subframe for transmission of the data signal, the reception processing unit calculates an OFDM symbol for receiving the data signal from a subframe number. The receiving device according to claim 7. A communication method of a transmitting device for transmitting a data signal to a receiving device, comprising:
The transmission step of transmitting the data signal without receiving the transmission permission control information transmitted by the receiving device, the identification signal multiplexing step of multiplexing the identification signal to the orthogonal resource, and the transmission of the data signal are continuous. Receiving in advance transmission parameters capable of indicating the use of frequency resources and the use of non-continuous and equally spaced frequency resources;
The transmission processing step transmits a first data transmission for transmitting the data signal using the continuous frequency resource based on the transmission parameter, and transmits the data using the non-consecutive and equally spaced frequency resource Transmitting the data signal in any of the second data transmissions. A communication method of a receiver for receiving data signals of a plurality of transmitters, the communication method comprising:
A reception processing step of receiving the data signal transmitted without transmitting transmission permission control information, an identification signal separation step of separating an identification signal received together with the data from orthogonal resources, and data transmission from the identification signal A transmission terminal identification step of identifying the transmission device that has performed the transmission, and a control information transmission step of transmitting in advance transmission parameters used for the data transmission,
The transmission parameters include information of frequency resources used for data transmission for each of the transmission devices, and the information of the frequency resources indicates continuous frequency resource use and non-continuous and equally spaced frequency resource use. A communication method characterized by being able to

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