WO2015115738A1 - Procédé et appareil pour faire fonctionner un terminal de transmission/réception par l'intermédiaire d'une attribution de ressources d'une communication de dispositif à dispositif (d2d) dans un système de communication sans fil - Google Patents

Procédé et appareil pour faire fonctionner un terminal de transmission/réception par l'intermédiaire d'une attribution de ressources d'une communication de dispositif à dispositif (d2d) dans un système de communication sans fil Download PDF

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WO2015115738A1
WO2015115738A1 PCT/KR2014/012996 KR2014012996W WO2015115738A1 WO 2015115738 A1 WO2015115738 A1 WO 2015115738A1 KR 2014012996 W KR2014012996 W KR 2014012996W WO 2015115738 A1 WO2015115738 A1 WO 2015115738A1
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control information
information
resource
communication
pusch
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PCT/KR2014/012996
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English (en)
Korean (ko)
Inventor
류현석
박승훈
박정호
유현규
정철
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삼성전자주식회사
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Priority claimed from KR1020140040003A external-priority patent/KR102235637B1/ko
Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to US15/115,653 priority Critical patent/US10177959B2/en
Publication of WO2015115738A1 publication Critical patent/WO2015115738A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present invention relates to an apparatus and a method for supporting a device to device (D2D), and more particularly, a technology related to resource allocation for communication in D2D and control information transmission therefor.
  • D2D device to device
  • D2D device-to-device communication
  • LTE Long Term Evolution
  • D2D communication is being standardized for the purpose of public safety. That is, D2D communication aims to achieve reliable communication between terminals in a situation where a base station is collapsed due to a natural disaster such as an earthquake or tsunami.
  • D2D communication in the areas outside the base station's coverage e.g., shaded areas and base station coverage halls
  • fire and terror suppression must be seamlessly communicated between terminals without the help of the base station. . Therefore, it is important to secure link reliability, rather than to increase bandwidth efficiency or system throughput, which was a requirement of existing cellular communications.
  • D2D communication which is currently being standardized for LTE Rel-12, may not require all such control information.
  • D2D communication is currently aimed at groupcast / broadcast communication, rather than unicast communication, which is commonly used in cellular, so that some form of L1 (layer 1: PHY) / L2 (layer 2: MAC, It was already agreed at the 3GPP RAN1 / RAN2 meeting that no PDCP, RLC) feedback would be performed. Under these assumptions, it is necessary to study what control information is required for D2D groupcast / broadcast communication.
  • the existing cellular frequency division duplexing (FDD) system uses different frequency bands for downlink and uplink transmission / reception (for example, downlink is f 1 band and uplink is f 2 band). Therefore, the base station transmits in the f 1 band, receives the f 2 band, and the terminal receives the f 2 transmission in the band, f 1 band.
  • the existing cellular time division duplexing (TDD) system downlink and uplink are performed in the same frequency band, but they are time-divided. That is, the uplink and downlink transmission is characterized by being divided on the frequency or time axis.
  • D2D communication is performed via the uplink.
  • a D2D transmitter transmits in an uplink f 2 band and a D2D receiver receives in an uplink f 2 band.
  • the D2D transmitter transmits using an uplink subframe and the D2D receiver receives using an uplink subframe. Since the D2D communication is performed through the uplink, it may be considered to reuse the uplink control information (UCI) and the physical uplink control channel (PUCCH) used in the existing cellular system as control information and control channel for the D2D.
  • UCI uplink control information
  • PUCCH physical uplink control channel
  • uplink uses SC-FDMA (Single Carrier-Frequency Division Multiple Access), which has superior peak-to-average power ratio (PAPR) characteristics compared to orthogonal frequency-division multiple access (OFDMA) regardless of FDD / TDD. do.
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • OFDMA orthogonal frequency-division multiple access
  • the base station centralized resource allocation based on various feedback information from the terminal.
  • a method for distributed resource allocation is needed.
  • distributed resource allocation there is no coordinator that can arbitrate the resource allocation. Therefore, when allocating a resource, a resource collision may occur due to the same resource allocation. Therefore, a solution to this problem is needed.
  • the problem to be solved by the present invention is the design and resource allocation of control information and control channel for D2D communication, the content and size of the control information, the design of the control channel for transmitting the control information, and distributed among the terminals
  • the present invention relates to a method and apparatus for operating a transmitting / receiving terminal through resource allocation of device to device (D2D) communication in a wireless communication system for allocating resources.
  • D2D device to device
  • a method of operating a transmitting terminal through resource allocation of device to device (D2D) communication, the D2D control information for the D2D communication PDCCH Mapping to at least one of Physical Downlink Control CHannel, Physical Uplink Shared CHannel, and Demodulation-Reference Signals (DM-RS); And transmitting the D2D control information mapped to at least one of the PDCCH, the PUSCH, and the DM-RS to a receiving terminal.
  • D2D device to device
  • DM-RS Demodulation-Reference Signals
  • the D2D control information for the D2D communication A mapping processor for mapping to at least one of a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH), and a demodulation-reference signal (DM-RS); And a transmitter for transmitting the D2D control information mapped to at least one of the PDCCH, the PUSCH, and the DM-RS to a receiving terminal.
  • a mapping processor for mapping to at least one of a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH), and a demodulation-reference signal (DM-RS);
  • DM-RS demodulation-reference signal
  • the D2D control information for the D2D communication is When the PDCCH is mapped and transmitted to at least one of a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH), and a demodulation-reference signal (DM-RS), the PDCCH, the PUSCH, and the D2D control information are mapped.
  • a physical downlink control channel PDCCH
  • PUSCH physical uplink shared channel
  • DM-RS demodulation-reference signal
  • the extracting of the D2D control information may include: out of a groupcast ID and a broadcast ID for a group defining a range of the D2D communication when the D2D control information is received mapped to a symbol of the PDCCH. At least one can be extracted from the D2D control information.
  • the extracting of the D2D control information may include demultiplexing the D2D control information from the modulated data information of the PUSCH when the D2D control information is mapped and received from a symbol of the PUSCH. have.
  • the extracting of the D2D control information may extract new data indicator information as the D2D control information when the D2D control information is mapped and received in the DM-RS. .
  • Extracting the new data identifier information may be performed using a parameter value having a size of 1 bit.
  • the D2D control information for the D2D communication is When the PDCCH is mapped and transmitted to at least one of a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH), and a demodulation-reference signal (DM-RS), the PDCCH, the PUSCH, and the D2D control information are mapped.
  • a physical downlink control channel PDCCH
  • PUSCH physical uplink shared channel
  • DM-RS demodulation-reference signal
  • a method of operating a transmitting terminal through resource allocation of device to device (D2D) communication, a plurality of resource blocks based on a predetermined time Setting up a resource structure to include at least one resource pool having Resouce Blocks; Allocating a resource for a signal to be transmitted by shifting the resource blocks included in the resource pool on a time axis every predetermined time; And transmitting the signal to a receiving terminal by using the allocated resource.
  • D2D device to device
  • the allocating of the resource may shift the resource blocks such that the shift interval of the resource pool is different from the shift interval of another resource pool at every predetermined time.
  • the resource when the predetermined time is a sum of a predetermined number of times, a unit cycle, the resource may be allocated by grouping the unit cycle.
  • a plurality of resource blocks on the basis of a predetermined time in the operating device of the transmitting terminal through the resource allocation of device to device (D2D) communication
  • a resource structure setting unit configured to set a resource structure to include at least one resource pool having Resouce Blocks
  • a resource allocator for allocating a resource for a signal to be transmitted by shifting the resource blocks included in the resource pool on a time axis every predetermined time
  • And a transmission interface unit for transmitting the signal to a receiving terminal by using the allocated resource.
  • a method of operating a receiving terminal through resource allocation of device to device (D2D) communication, a plurality of resource blocks based on a predetermined time Receiving the signal from a transmitting terminal through the allocated resource when the resource for the signal is allocated according to a resource structure including at least one resource pool having Resume Blocks; And decoding the received signal.
  • D2D device to device
  • the allocated resources may be allocated by grouping the unit periods when the periods in which the predetermined time is added up a predetermined number of times are unit cycles.
  • the receiving of the signal from the transmitting terminal may further include determining whether the signal is information related to its own group when the signal is transmitted through an allocated resource grouped by the unit period. May receive the signal if it corresponds to information associated with its group.
  • the determining of whether the signal is information related to its own group may include: receiving system frame information indicating information on allocated resources grouped by the unit period from the transmitting terminal, using the system frame information. It may be determined whether the signal is information related to its group.
  • the receiving of the signal from the transmitting terminal may further include switching to a standby mode when the signal is not information related to its group when the signal is transmitted through the allocated resource grouped by the unit period. Can be.
  • the reception device for the operation of the receiving terminal through the resource allocation of the D2D (Device to Device) communication, the reception of the signal transmitted from the transmitting terminal A receiving interface unit for interfacing;
  • a resource for a signal is allocated according to a resource structure including at least one resource pool having a plurality of resource blocks based on a predetermined time, the transmitting terminal through the allocated resource A control unit controlling to receive the signal from the computer; And a decoder for decoding the received signal.
  • D2D device to device
  • the determining of the transmission timing of the data for the D2D communication may include: comparing the energy levels with a predetermined threshold value; Determining the congestion class according to a result of comparing the energy levels with the predetermined threshold value; And determining the transmission timing corresponding to the determined congestion class.
  • the determining of the transmission timing may increase a transmission window size of the transmission timing as the degree of congestion according to the determined congestion level increases.
  • the signal for the D2D communication for a predetermined time
  • Signal receiving unit for receiving the;
  • An energy level detector for detecting an energy level of each of the resource blocks corresponding to the signals received during the predetermined time;
  • a transmission timing controller configured to determine a transmission timing of data for the D2D communication according to a congestion class corresponding to the detected energy levels.
  • the D2D communication can be made more reliable.
  • control information for D2D communication, it is possible to transmit control information only by transmitting data channels without designing a separate physical control channel.
  • the terminal when resources are distributed among terminals, the terminal itself may determine its own situation and adjust a transmission opportunity to prevent resource collision in advance. Therefore, it can be effectively used to guarantee the reliability of D2D communication.
  • the power consumption can be reduced by switching to the standby mode when it is not information related to its own group.
  • 1 is a reference diagram illustrating a structure of a PUCCH control channel to which the present invention is compared.
  • FIG. 2 is a reference diagram illustrating a PDCCH control channel structure to which the present invention is compared.
  • FIG. 3 is a reference diagram illustrating the physical processing of the PDCCH to be compared of the present invention.
  • FIG. 4 is a reference diagram illustrating piggybacking control information on a PUSCH to be compared according to the present invention.
  • FIG. 5 is a reference diagram illustrating physical processing for format A type of D2D control information (CI) through a PDCCH structure corresponding to an embodiment of the present invention.
  • FIG. 6 is a reference diagram illustrating piggyback processing for formats A and B of D2D control information (CI) through a PUSCH structure corresponding to an embodiment of the present invention.
  • FIG. 7 is a reference diagram illustrating mapping of format A type of D2D control information (CI) of FIG. 6 to PUSCH.
  • 8A and 8B are reference diagrams illustrating a resource structure for resource allocation according to an embodiment of the present invention.
  • FIG. 9 is a reference diagram illustrating a random back-ff operation in WiFi to which the present invention is compared.
  • FIG. 10 is a reference diagram illustrating a random back-ff operation according to a degree of congestion in D2D corresponding to an embodiment of the present invention.
  • FIG. 11 is a flowchart of an embodiment for explaining a method of operating a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • FIG. 12 is a flowchart of an exemplary embodiment for describing a process of mapping D2D control information illustrated in FIG. 11.
  • FIG. 13 is a flowchart of another embodiment for explaining a process of mapping D2D control information illustrated in FIG. 11.
  • FIG. 14 is a block diagram illustrating an embodiment of an operation apparatus of a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • FIG. 15 is a block diagram of an exemplary embodiment for describing the mapping processor illustrated in FIG. 14.
  • FIG. 16 is a block diagram of another embodiment for describing the mapping processor illustrated in FIG. 14.
  • 17 is a flowchart of an embodiment for explaining a method of operating a reception terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • FIG. 18 is a block diagram illustrating an embodiment of an operation apparatus of a receiving terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • 19 is a flowchart of an embodiment for explaining a method of operating a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • 20 is a block diagram illustrating an embodiment of an operation apparatus of a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • 21 is a flowchart of an embodiment for explaining a method of operating a reception terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • FIG. 22 is a block diagram illustrating an embodiment of an operation apparatus of a receiving terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • 23 is a flowchart of another embodiment for explaining a method of operating a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • FIG. 24 is a flowchart of an exemplary embodiment for explaining a process of determining transmission timing according to the congestion class illustrated in FIG. 23.
  • 25 is a block diagram of another embodiment for explaining an operation apparatus of a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • FIG. 26 is a block diagram of an exemplary embodiment for describing the transmission timing controller illustrated in FIG. 25.
  • a base station transmits control information through various downlinks to a terminal through a downlink to a base station.
  • Control information transmitted by the base station through the downlink to the terminal is referred to as Downlink Control Information (DCI)
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • DCI and UCI have various formats and control information according to the purpose of control, respectively.
  • DCI format 0 PUSCH scheduling information
  • DCI format 1 PDSCH (Physical Downlink Shared CHannel) scheduling information
  • DCI format 1A PDSCH compact scheduling information
  • DCI format 1B DCI format 1A + precoding information
  • DCI format 1C PDSCH very compact scheduling + MCCH (Multicast Control CHannel) information
  • DCI format 1D DCI format 1B + power offset information (Multi-User MIMO: for MU-MIMO)
  • DCI format 2 PDSCH scheduling (for closed-loop MIMO) information
  • DCI format 2A PDSCH scheduling (for open-loop MIMO) information
  • DCI format 2B PDSCH scheduling (beamforming) using DM-RS
  • DCI format 2C PDSCH scheduling (spatial multiplexing) information using DM-RS
  • DCI format 3 1-bit PUCCH, PUSCH TPC (Transmit Power Control) command information
  • DCI format 3A 2-bit PUCCH, PUSCH TPC (Transmit Power Control) command information
  • DCI format 4 PUSCH scheduling (multi-antenna port transmission mode)
  • UCI format 1a 1-bit HARQ ACK / NACK with or without SR
  • UCI format 1b 2-bit HARQ ACK / NACK with or without SR
  • LTE uses various methods and can be classified into two types.
  • Control information is multiplexed with data information to transmit control information through the data channel
  • LTE defines various physical control channels.
  • the above control information is transmitted through PDCCH (Physical Downlink Control CHannel) and PUCCH (Physical Uplink Control CHannel).
  • PDCCH Physical Downlink Control CHannel
  • PUCCH Physical Uplink Control CHannel
  • the DCI is transmitted from the base station to the terminal through the downlink PDCCH, and is located in 1 to 3 OFDM symbols of every subframe.
  • the UCI is transmitted to the base station through the PUCCH of the uplink to the base station, and is located in the Resource Block (s) of the frequency axis located at both ends of every subframe.
  • the corresponding terminal may need to transmit control information in the uplink.
  • the corresponding UE may multiplex uplink control information on the allocated PUSCH and transmit the same to the base station.
  • the resource allocation agent in the cellular system is the base station. That is, the base station allocates resources to the terminal according to various scheduling conditions (for example, fairness, etc.) based on channel information with all terminals located in the cell managed by the base station. For example, a terminal having an uplink resource allocated from the base station reports its buffer status to the base station. At this time, the information for the Buffer Status Report (BSR) is transmitted through the MAC control element of the PUSCH. If the terminal does not have resources allocated for reporting the buffer status, the UE sends a scheduling request (SR) to the base station.
  • BSR Buffer Status Report
  • SR status report
  • the terminal reports the downlink channel measurement result to the base station periodically or by a command of the base station through the PUCCH (eg, UCI formats 4, 5, 6).
  • the base station informs the terminal of the resource information (eg, resource size, MCS: modulation and coding scheme) to be received by the terminal on the basis of the PDCCH.
  • the UE may obtain control information by decoding the PDCCH, and may decode its own data transmitted in downlink through the PDSCH based on the PDCCH.
  • the base station may periodically or aperiodically request a SRS (Sounding Reference Signal) transmission from the UE.
  • the terminal transmits the SRS to the base station according to the command of the base station, and the base station may obtain the uplink channel state of each terminal through the received SRS.
  • the base station allocates an uplink resource that can be used by each terminal based on the uplink channel state obtained by the base station and BSR information transmitted by the terminal through the PUSCH.
  • the uplink resource allocation information is transmitted to the terminal through the PDCCH using DCI (eg, DCI format 0, DCI format 4).
  • the present invention defines the control information and the control channel as follows for the design and content of the control information for D2D communication, the design of the control channel for transmitting the control information.
  • the contents of the present invention will be described based on the above-described contents related to control information, control channel, and resource allocation.
  • DCI format 0 or DCI format 4 which is information related to scheduling of PUSCH among DCIs used in the existing LTE cellular system may be a candidate group of control information for D2D communication. Since the antenna configuration for the D2D communication is assumed to be the transmit antenna 1 and the receive antenna 2, DCI format 0 is used as control information for D2D communication rather than DCI format 4 supporting multi-antenna ports. It is expected to be suitable. However, since there may be D2D communication using multiple antennas in Rel-13 or Rel-14, using DCI format 4 as control information for D2D communication cannot be excluded.
  • the control information included in DCI format 0 and DCI format 4 is described in more detail as follows.
  • Carrier indicator (0 or 3 bits)
  • Carrier indicator (0 or 3 bits)
  • DCI format 4 The control information constituting DCI format 4 and DCI format 0 is almost similar. However, since DCI format 4 supports multi antennas, MCS, redundancy version (RV), and new data indicator (NDI) information are required for each transport block. In LTE, multi-antennas can transmit up to two transport blocks, so in DCI format 4, such control information is doubled compared to DCI format 0.
  • DCI format 4 supports multi antennas, MCS, redundancy version (RV), and new data indicator (NDI) information are required for each transport block.
  • RV redundancy version
  • NDI new data indicator
  • a general cellular system uses PUSCH hopping to obtain frequency diversity in uplink PUSCH transmission, and there are two PUSCH hoppings of type 1 and type 2.
  • Type 2 PUSCH hopping has a cell-specific hopping pattern and hopping is performed in sub-band units.
  • D2D since there is no feedback in D2D communication, feedback information such as a TPC command for PUCCH, an SRS request, or a CSI request may no longer be required in the D2D.
  • control information (CI) for D2D will use only one format, a flag bit for identifying format 0 and format 1 may not be needed.
  • Carrier indicator may not be suitable as control information for D2D because it is information required for carrier aggregation.
  • D2D since D2D transmits / receives through an uplink subframe, there may be no distinction between UL and DL. Therefore, 1 bit information for resource allocation type may not be necessary in D2D. Therefore, the summary is as follows.
  • NDI information is needed because the same information is retransmitted. This is to determine whether the terminal should perform combining because it is data to perform combining or new data.
  • HARQ Incremental Redundancy since the same information is not retransmitted, RV information indicating the starting point of the circular buffer is needed.
  • the receiving end may perform IR even when information different from the initial transmission is received using the RV information transmitted by the transmitting end.
  • control information such as RV or NDI because there is no feedback.
  • the transmitting end should perform repeated transmission.
  • the transmitter performs transmission-> CRC check at the receiving end and then detects errors-> transmits NACK from the receiving end to the transmitting end-> retransmits at the transmitting end.
  • the transmitting end performs repetitive transmission. In this case, information on the number of repetitions and whether to repeatedly transmit in the form of IR or CC may be necessary.
  • IR can achieve higher coding gain than CC, but it is well known to increase the complexity of the receiver.
  • the coding gain of IR has been known to increase with the use of a high MCS. Since D2D communication will use a low MCS (e.g.
  • a 16-bit CRC masked by a UE ID is added to DCI information of each UE generated by an eNB in an existing cellular system, and a rate 1/3 tailbiting convolution code is added.
  • the signal is multiplexed with DCI information of other UEs through a rate matching process.
  • the multiplexed multiple DCI information performs cell-specific and subframe specific scrambling and is symbolized through QPSK modulation.
  • the symbolized DCI information performs interleaving and is mapped to OFDM symbols of the PDCCH through a cell-specific cyclic shift pattern.
  • the terminal transmits various feedback information to the base station through the PUCCH. Since PUCCH cannot be the subject of comparison of the present invention, detailed description thereof will be omitted.
  • control information When the control information is multiplexed with the data information and transmitted, when the terminal has data to be transmitted on the PUSCH, the control information may be transmitted on the PUSCH without transmitting on the PUCCH. That is, after data and control information pass through different coding blocks, rate matching, and modulators, data symbols and control information symbols are multiplexed through time division multiplexing (TDM).
  • TDM time division multiplexing
  • the TDM data symbol and the control information symbol constitute an SC-FDM symbol through the DFT and the IFFT.
  • control information for D2D communication is D2D CI format A
  • a structure for transmitting uplink control information through a PDCCH structure and a PUSCH may be taken.
  • CI format B it may be transmitted through a structure for transmitting uplink control information through a PUSCH or through a DM-RS.
  • D2D communication is performed by groupcast or broadcast method, so that 16-bit CRC added to the control information cannot be masked with UE-ID (C-RNTI). Therefore, masking is performed by newly defined group-RNTI or broadcast-RNTI.
  • group-specific scrambling should be used instead of cell-specific scrambling. So the scrambling sequence generator Should be initialized to At this time A group of exemplifies a firefighter group, a police officer group, and the like, and each group may use a group-specific predefined ID.
  • control information is mapped to the symbols nearest to the DM-RS of the PUSCH.
  • c (i) represents the pseudo-random sequence.
  • c (i) is initialized using the value of Equation 4 below at the beginning of each radio frame.
  • Equation 1 In D2D communication, overhead can be reduced by using cyclic shift and OCC values defined in advance. Therefore, all parameters that are changed through the higher layer in Equations 1 to 4 must use fixed values. E.g, Etc.
  • DCI format 0 is used for PUSCH. Wow The value of was sent. In D2D these values must be fixed. Meanwhile, the equation 4 silver Must be defined as In order to transmit 1 bit information of new data indicator to DM-RS, two predefined parameter values can be used.
  • the above values are one example, and any two fixed values may be used. Since the receiving end may not know which of the two parameters the DM-RS is to be transmitted, the final value should be determined after detecting in all cases.
  • the distributed resource allocation operation based on the existing energy sensing is as follows. First, signals are received during a predefined sensing period. Thereafter, energy levels of all resource blocks (RBs) within the received sensing interval are measured. The RB (s) having the lowest energy level is then selected to transmit data.
  • RBs resource blocks
  • X [%] minimum energy rule or blank RB has been considered.
  • the X [%] minimum energy rule does not select the lowest energy RB (s) when the UE selects RB (s) to transmit data, but sorts the energy levels to lower X [%] (eg , RB (s) having an energy level of 5 [%]).
  • This method has the advantage of randomizing collision or congestion, but it is not a solution when the traffic is increased or the load is heavy.
  • the blank RB is to stop the transmission and receive in the RB it transmits.
  • the assumption here is that the same data transfer is repeated. That is, if a TX repeatedly transmitting data stops transmitting for a predetermined time and receives the data, it may be determined whether or not another user performs data transmission in the RB used by the TX. If there is no data transmission of another user, the user performs data transmission again. Otherwise, if there is another user's data transmission, the user gives up the data transmission from the RB selected by the user and selects another RB again to perform data transmission.
  • the Blank RB method has a disadvantage of losing its transmission opportunity.
  • distributed resource allocation is also operated based on energy sensing and has the following procedure.
  • signals are received during a predefined sensing period. Thereafter, energy levels of all resource blocks (RBs) within the received sensing interval are measured. Then, the transmission timing is adjusted based on the predefined congestion level.
  • RBs resource blocks
  • Congestion level is 2 levels of high / low, 3 levels of high / medium / low, or Level 1, Level 2, Level 3, Level 4,... It can be defined as four or more steps. For example, in the case of step 2: If the number of RBs with energy levels below the predefined threshold is X or more, or if the number of RBs with energy levels above the predefined threshold is X or below, the congestion level is determined to be low. (Conversely, the congestion level is high).
  • the congestion level is low. (Conversely, you can judge that the level of congestion is high).
  • congestion levels can be defined in three, four, or more steps. At this time, the transmission timing corresponding to each congestion level is a value that must be predefined in advance.
  • 1 is an example of a structure of a PUCCH control channel to which the present invention is compared.
  • the PUCCH occupies N PUCCH RBs at both ends of the frequency band.
  • the remaining RBs are used for transmission of the (N PUSCH ) PUSCH.
  • the RB configures an L subcarrier on the frequency axis and an M symbol (SC-FDM symbol) on the time axis.
  • the PUCCH control channel structure of the existing LTE system may be considered.
  • simultaneous transmission of PUCCH and PUSCH is not possible in order for a D2D transmitter to transmit data in D2D communication to maintain the characteristics of a single carrier. Therefore, the PUCCH structure may be undesirable as a control channel for D2D communication.
  • the PDCCH occupies N PDCCH symbols (OFDM symbols) of M symbols on a time axis within one subframe and uses the full bandwidth on the frequency axis.
  • the PDCCH control channel structure of the existing LTE system may be considered.
  • a base station is the only transmitter that transmits control information in downlink in an existing LTE system.
  • the base station is the only receiver to receive the control information transmitted in the uplink in the LTE system.
  • a plurality of transmitters may transmit control information and a plurality of receivers may receive control information. Therefore, multiplexing on control channels transmitted by each D2D transmitter should be considered. When considering distributed resource allocation in D2D communication, multiplexing of control channels may not be easy because coordinator does not exist separately.
  • the D2D CI format B is selected as the D2D control information, bringing a separate physical control channel structure may cause a lot of system overhead.
  • Figure 3 shows the physical processing of the PDCCH to be compared of the present invention.
  • 16-bit CRC masked with UE-ID (or C-RNTI) is added to the CI information generated from the upper layer.
  • the CI information is X bits
  • X + 16 bits are generated.
  • CI information for each UE is encoded using a tailbiting convolution code having a coding rate 1/3, and multiplexed through rate matching.
  • a tailbiting convolution code having a coding rate 1/3, and multiplexed through rate matching.
  • Assumes that after indicating the rate matching, indicates a bits string transmitted to the PDCCH (i) (or UE (i)) in one subframe (ie To send).
  • the number of PDCCHs that can be transmitted in one subframe In this case, the following bits columns are generated after multiplexing.
  • the generated bits columns are scrambled through a cell-specific scramble sequence to randomize the interference of the inter-cell control channel.
  • the scramble sequence generator is initialized with the value of Equation 5 below.
  • the scrambled bits columns are mapped to resource elements through interleaving and cell-specific cyclic shifts after QPSK modulation.
  • PUSCH Physical uplink shared channel
  • PUSCH physical uplink shared channel
  • Each control information is divided into data information (UL-SCH) and Time Division Multiplexing (TDM) to enter the input of the SC-FDM.
  • FIG. 5 is a reference diagram illustrating physical processing for format A type of D2D link control information (CI) over a PDCCH corresponding to an embodiment of the present invention.
  • 16-bit CRC masked with Group-ID (or Group-RNTI) and Broadcast-ID (or Broadcast-RNTI) is added to the D2D CI information generated from the upper layer.
  • Group-ID is used for groupcast communication and Broadcast-ID is used for broadcast communication.
  • CI information is encoded using a tailbiting convolution code having a coding rate of 1/3, and scrambled through a group-specific scramble sequence to randomize interference of control channels between different groups through rate matching.
  • the scramble sequence generator is initialized with the value of Equation 6 below.
  • the scrambled bits columns are mapped to resource elements through interleaving and group-specific cyclic shifts after QPSK modulation.
  • FIG. 6 is a reference diagram illustrating piggyback processing for formats A and B of D2D control information (CI) through PUSCH according to an embodiment of the present invention. That is, FIG. 6 illustrates an example of piggybacking D2D CI format A or D2D CI format B with a PUSCH.
  • D2D CI format A or D2D CI format B is time division multiplexed (TDM) with data information (UL-SCH) and enters the input of SC-FDM.
  • TDM time division multiplexed
  • UL-SCH data information
  • FIG. 7 is a reference diagram illustrating mapping of format A type of D2D control information (CI) of FIG. 6 to PUSCH. That is, FIG. 7 is an example in which the TDM-D2D control information and data information generated in FIG. 6 are mapped to the PUSCH. To increase the reception reliability of the D2D control information, it is mapped to the left or right side of the DM-RS.
  • FIG. 7A illustrates an example of using a long CP
  • FIG. 7B illustrates an example of using a long CP.
  • the bandwidth of the frequency axis is composed of L resource pools (RP), each RP is used by a predefined group, and the basic unit of the size of the RP is N SC-FDM symbols on the time axis and M subcarriers on the frequency axis.
  • the size of the RP may vary depending on the number of groups and the bandwidth. For example, assuming B-RB for bandwidth, and the predefined number of groups is G, the size of each RP becomes B / G RBs on the frequency axis. That is, the size of the RB constituting each RP is characterized by the same. However, since information on the RP that each group can use may be predefined, the size of the RB in the RP that each group can use may be different.
  • each RP has a predefined time shift pattern. For example, during the first K TTI period and the next K TTI period, the resource block of RP1 is shifted once on the time axis and the resource block of RP2 is shifted twice on the time axis.
  • the purpose of this shift is to solve the half-duplex problem. That is, when A1 transmits from RP1 and B1 transmits from RP2 during the K TTI period, A1 and B1 cannot receive each other's signals. Therefore, when different shifts are performed on the time axis in the next K TTI interval, signals may be received from each other. To this end, each D2D transmitter repeatedly transmits its own data N times.
  • NDI New Data Indicator
  • RV Redundancy Version
  • CC chase combining
  • IR incremental redundancy
  • a transmitter which intends to perform broadcast communication may transmit control information and data information generated through a broadcast ID instead of a group ID in its RP.
  • this method has a disadvantage that the receiving end should always attempt to decode using two IDs, group ID and broadcast ID, and decode all resources. Therefore, in the example of FIG. 8, it is necessary to ensure that a specific RP (s) can be used for broadcast purposes.
  • RP L can be used only by a transmitter that wants to broadcast, and a terminal performing groupcast communication should always monitor its RP and RP L.
  • FIG. 8B is a reference diagram illustrating a resource structure for resource allocation according to another embodiment of the present invention.
  • the difference from FIG. 8A is that the RP for each group is divided on the time axis. That is, RP1 for group 1 lasts for N1 TTI, and then RP2 for group 2 for another N2 TTI. At this time, N1 and N2 may be the same or different operations.
  • the receiving end performs decoding by receiving a signal during the first K TTI period, and then switches to the idle mode during the N-K TTI if it is not related to its group.
  • This requires the assumption that the synchronization is exactly the same between all group members and that the system frame number / frame number is known. It may be assumed that synchronization has been performed between terminals through a separate synchronization channel, and system frame number / frame number may be assumed that all terminals have received through a channel for transmitting separate system information. That is, the transmitting terminal should transmit the MIB like the MIB (Master Information Block) that the base station broadcasts to the terminals existing in the cell it manages.
  • MIB Master Information Block
  • N does not switch to Idle state. -Receive corresponding data during K TTIs.
  • FIG. 9 is a reference diagram illustrating a random back-ff operation in WiFi to which the present invention is compared.
  • a contention window size eg, 8 or 16
  • the contention window size is increased (32, 64, 128,).
  • FIG. 10 is a reference diagram illustrating a random back-ff operation according to a degree of congestion in D2D corresponding to an embodiment of the present invention. That is, FIG. 10 shows a table for backoff to prevent congestion in D2D.
  • the UE belonging to each group knows the RP used by the group and the time shift pattern in the corresponding RP in advance.
  • the next TTI is transmitted after the scan during the K TTI, there is a need for a method of preventing the transmission because the probability of transmitting the same resource between terminals increases.
  • Backoff in WiFi may be a similar scheme, but as shown in FIG. 9, the contention window size increases when WiFi is NACKed. Since D2D communication does not have a separate feedback channel, the transmitter should determine its state and adjust the contention window size accordingly.
  • the data transmission section is changed according to the congestion level determined by the terminal itself, rather than transmitting data in the next section after energy sensing.
  • Congestion level is 2 levels of high / low, 3 levels of high / medium / low, or Level 1, Level 2, Level 3, Level 4,... It can be defined as four or more steps. For example, in the case of step 2: If the number of RBs with energy levels below the predefined threshold is X or more, or if the number of RBs with energy levels above the predefined threshold is X or below, the congestion level is determined to be low. (Or vice versa, the congestion level is high).
  • the congestion level is low. It can be determined (or vice versa, the level of congestion is high).
  • congestion levels can be defined in three, four, or more steps. At this time, the transmission timing corresponding to each congestion level is a value that should be predefined in advance.
  • FIG. 11 is a flowchart of an embodiment for explaining a method of operating a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • the transmitting terminal maps the D2D control information for the D2D communication to at least one of Physical Downlink Control CHannel (PDCCH), Physical Uplink Shared CHannel (PUSCH), and Demodulation-Reference Signals (DM-RS) (S100).
  • PDCCH Physical Downlink Control CHannel
  • PUSCH Physical Uplink Shared CHannel
  • DM-RS Demodulation-Reference Signals
  • the transmitting terminal transmits the D2D control information mapped to at least one of the PDCCH, the PUSCH, and the DM-RS to a receiving terminal for D2D communication (S102).
  • FIG. 12 is a flowchart of an exemplary embodiment for describing a process of mapping D2D control information illustrated in FIG. 11. 12 illustrates a mapping process when the D2D control information is mapped to a symbol of the PDCCH.
  • the D2D control information mapped to the symbol of the PDCCH includes resource block assignment information, Modulation and Coding Scheme (MCS) information, redundancy version information, new data identifier information, and DM information.
  • MCS Modulation and Coding Scheme
  • OCC Orthogonal Complementary Code
  • the transmitting terminal adds at least one of the groupcast ID and the broadcast ID for the group defining the range of the D2D communication to the D2D control information (S200).
  • the transmitting terminal adds masking of the groupcast ID or broadcast ID to a cyclic redundancy code (CRC) to the D2D control information.
  • CRC cyclic redundancy code Since D2D communication is performed by groupcast or broadcast method, 16-bit CRC masked by newly defined group cast ID (or Group-RNTI) and broadcast ID (or Broadcast-RNTI) in 16-bit CRC added to the control information. Is added to the D2D control information.
  • the transmitting terminal convolutionally codes the D2D control information to which the groupcast ID or the broadcast ID is added (S202).
  • the D2D control information may be encoded using a tailbiting convolution code having a coding rate 1/3.
  • the transmitting terminal matches the transmission rate for the convolution coded D2D control information (S204).
  • the transmitting terminal scrambling the D2D control information matched with the transmission rate using the groupcast ID or the broadcast ID (S206).
  • group specific scrambling should be used.
  • scrambling is performed through a group-specific scramble sequence. In particular, it is initialized to the value of Equation 6 at the start of each subframe.
  • Each group uses a group-specific predefined ID.
  • the transmitting terminal modulates the scrambled D2D control information (S208).
  • the D2D control information may perform quadrature phase shift keying (QPSK) modulation as an example of a modulation scheme.
  • QPSK quadrature phase shift keying
  • step S208 the transmitting terminal interleaves the modulated D2D control information (S210).
  • the transmitting terminal After step S210, the transmitting terminal performs a group-specific cyclic shift processing on the interleaved D2D control information (S212). It is mapped to a resource element via a group specific cyclic shift.
  • FIG. 13 is a flowchart of another embodiment for explaining a process of mapping D2D control information illustrated in FIG. 11.
  • FIG. 13 illustrates a mapping process when the D2D control information is mapped to a symbol of the PUSCH.
  • the D2D control information mapped to the symbol of the PSCCH includes resource block assignment information, Modulation and Coding Scheme (MCS) information, redundancy version information, new data identifier information, and DM information. Cyclic shift information and Orthogonal Complementary Code (OCC) index information for a demodulation-reference signal (RS) may be included.
  • the D2D control information mapped to the symbol of the PSCCH may include only new data indicator information corresponding to 1 bit.
  • the transmitting terminal maps the D2D control information to a symbol of the PUSCH
  • convolutional coding is performed on the D2D control information (S300).
  • the transmitting terminal matches the transmission rate for the convolutionally coded D2D control information (S302).
  • the transmitting terminal modulates the D2D control information matched with the transmission rate (S304).
  • the transmitting terminal multiplexes the modulated D2D control information with the modulated data information of the PUSCH (S306).
  • the transmitting terminal maps to symbols nearest to the demodulation-reference signals (DM-RSs) of the PUSCH.
  • the mapping of the D2D control information to the symbols of the PUSCH is to perform piggyback processing on the format A and B types of the D2D control information (CI) through the PUSCH in FIG. Therefore, format A or format B of the D2D control information is time-division-divided (Time Division Multiplexing (TDM)) with data information (UL-SCH) and enters the input of the SC-FDM.
  • TDM Time Division Multiplexing
  • the D2D control information may be directly mapped to the demodulation-reference signal (DM-RS).
  • the transmitting terminal maps the new data indicator information as the D2D control information mapped to the DM-RS.
  • two predefined parameter values may be used.
  • the above values are one example, and any two fixed values may be used. Since the receiving end may not know which of the two parameters the DM-RS is to be transmitted, the detection is performed in all cases and then the final value is determined.
  • FIG. 14 is a block diagram of an exemplary embodiment for describing an operation apparatus 400 of a transmitting terminal through resource allocation of D2D communication in a wireless communication system, including a mapping processor 410 and a transmitter 420. do.
  • the mapping processor 410 maps the D2D control information for D2D communication to at least one of Physical Downlink Control CHannel (PDCCH), Physical Uplink Shared CHannel (PUSCH), and Demodulation-Reference Signals (DM-RS). It is transmitted to the transmitter 420.
  • PDCCH Physical Downlink Control CHannel
  • PUSCH Physical Uplink Shared CHannel
  • DM-RS Demodulation-Reference Signals
  • the transmitter 420 transmits the D2D control information mapped to at least one of the PDCCH, the PUSCH, and the DM-RS to a receiving terminal.
  • the transmitter 420 includes a wireless communication module for interfacing wireless communication with a receiving terminal.
  • FIG. 15 is a block diagram illustrating an example of the mapping processing unit 410 illustrated in FIG. 14, and is a block diagram 410A when the D2D control information is mapped to a symbol of the PDCCH.
  • the mapping processor 410 is a group information addition module 500, the first convolutional coding module 510, the first rate matching module 520, the scrambling module 530, the first modulation module 540, interleaving Module 550 and cyclic shift module 560.
  • the group information adding module 500 maps the D2D control information to a symbol of the PDCCH
  • the group information adding module 500 adds a groupcast ID or broadcast ID for the group defining the range of the D2D communication to the D2D control information.
  • the control information added with the groupcast ID or the broadcast ID is transmitted to the first convolutional coding module 510.
  • the group information adding module 500 adds masking of the groupcast ID or the broadcast ID to a cyclic redundancy code (CRC) to the D2D control information.
  • CRC cyclic redundancy code
  • the D2D control information mapped to the symbol of the PDCCH includes resource block assignment information, Modulation and Coding Scheme (MCS) information, redundancy version information, new data identifier information, and DM information. Cyclic shift information for the demodulation-reference signal (RS) and orthogonal complementary code (OCC) index information are included.
  • MCS Modulation and Coding Scheme
  • RS demodulation-reference signal
  • OCC orthogonal complementary code
  • the first convolutional coding module 510 convolutionally codes the D2D control information added with the groupcast ID and the broadcast ID, and converts the convolutional coded D2D control information to the first rate matching module 520. To pass.
  • the first convolutional coding module 510 may encode the D2D control information by using a tailbiting convolution code having a coding rate 1/3.
  • the first rate matching module 520 matches the rate for the convolutional coded D2D control information, and transmits the matched rate of the D2D control information to the scrambling module 530.
  • the scrambling module 530 uses the groupcast ID or the broadcast ID to scramble the D2D control information having a matching rate, and transmits the scrambled D2D control information to the first modulation module 540. .
  • the scrambling module 530 scrambling through the group-specific scramble sequence to randomize the interference of the control channel between different groups for the D2D control information with a matching rate.
  • the first modulation module 540 modulates the scrambled D2D control information, and transmits the modulated D2D control information to the interleaving module 550.
  • the first modulation module 540 may perform quadrature phase shift keying (QPSK) modulation on the D2D control information.
  • QPSK quadrature phase shift keying
  • the interleaving module 550 interleaves the modulated D2D control information and transmits the interleaved D2D control information to the cyclic shift module 560.
  • the cyclic shift module 560 performs group-specific cyclic shift on the interleaved D2D control information.
  • FIG. 16 is a block diagram illustrating another example of the mapping processing unit illustrated in FIG. 14, and is a block diagram 410B when the D2D control information is mapped to a symbol of the PUSCH.
  • the mapping processor 410 includes a second convolutional coding module 600, a second rate matching module 610, a second modulation module 620, and a multiplexing module 630.
  • the D2D control information mapped to the symbol of the PSCCH includes resource block assignment information, Modulation and Coding Scheme (MCS) information, redundancy version information, new data identifier information, and DM information. Cyclic shift information and Orthogonal Complementary Code (OCC) index information for a demodulation-reference signal (RS) may be included.
  • the D2D control information mapped to the symbol of the PSCCH may include only new data indicator information corresponding to 1 bit.
  • the second convolutional coding module 600 maps the D2D control information to a symbol of the PUSCH, the second convolutional coding module 600 convolutionally codes the D2D control information, and converts the convolutionally coded D2D control information into a second rate matching module. Forward to 610.
  • the second rate matching module 610 matches the rate for the convolutionally coded D2D control information, and transmits the D2D control information matched with the rate to the second modulation module 620.
  • the second modulation module 620 modulates the D2D control information with matching data rates, and transmits the modulated D2D control information to the multiplexing module 630.
  • the multiplexing module 630 multiplexes the modulated D2D control information with the modulated data information of the PUSCH.
  • the multiplexing module 630 maps the D2D control information to symbols closest to Demodulation-Reference Signals (DM-RS) of the PUSCH.
  • the multiplexing module 630 maps the D2D control information to the left or right side of the DM-RS in order to increase the reception reliability of the D2D control information.
  • DM-RS Demodulation-Reference Signals
  • the mapping processor 410 may map new data indicator information as the D2D control information.
  • the mapping processor 410 uses a parameter value having a size of 1 bit as the new data identifier information.
  • format B of the D2D control information since only new data indicator information corresponding to 1 bit information is transmitted, it is possible to transmit the D2D control information through the DM-RS.
  • Two predefined parameter values may be used to carry and transmit 1 bit information of a new data indicator corresponding to D2D control information to the DM-RS. Since the receiver does not know which of the two parameters the DM-RS is to be transmitted, the detection is performed in all cases and then the final value is determined.
  • 17 is a flowchart of an embodiment for explaining a method of operating a reception terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • the D2D control information is mapped and transmitted from at least one of a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH), and a demodulation-reference signal (DM-RS) from a transmitting terminal for D2D communication
  • the D2D control At least one of the PDCCH, the PUSCH, and the DM-RS to which information is mapped is received (S700).
  • At least one of the received PDCCH, the PUSCH, and the DM-RS is recovered to extract the D2D control information (S702).
  • the D2D control information When the D2D control information is received mapped to a symbol of the PDCCH, at least one of a groupcast ID and a broadcast ID for a group defining a range of the D2D communication is extracted from the symbol of the PDCCH.
  • the D2D control information is extracted by restoring data in the reverse order of the mapping process of the PDCCH shown in FIG.
  • the D2D control information when the D2D control information is received mapped to the symbol of the PUSCH, the D2D control information is demultiplexed and extracted from the modulated data information of the PUSCH. In order to extract the D2D control information from the symbol of the PUSCH, the D2D control information is extracted by restoring data in the reverse order of the mapping process of the PUSCH shown in FIG.
  • new data indicator information is extracted as the D2D control information.
  • new data identifier information of one bit is extracted using two parameter values as the D2D control information. Since the DM-RS including the D2D control information does not know which of the two parameters, the final value is determined after detection in all cases.
  • FIG. 18 is a block diagram of an exemplary embodiment for explaining an operation apparatus of a receiving terminal through resource allocation of D2D communication in a wireless communication system, including a receiving unit 810 and a control information extracting unit 820. .
  • the receiver 810 includes a wireless communication module for interfacing wireless communication with a transmitting terminal.
  • the control information extractor 820 extracts the D2D control information by restoring at least one of the received PDCCH, the PUSCH, and the DM-RS.
  • the control information extracting unit 820 When the D2D control information is received mapped to the symbol of the PDCCH, the control information extracting unit 820 includes at least one of a groupcast ID and a broadcast ID for the group defining the range of the D2D communication. Extract from symbol. The control information extractor 820 extracts the D2D control information by restoring data in the reverse order of the mapping process of the PDCCH in order to extract the D2D control information from the symbol of the PDCCH.
  • control information extractor 820 demultiplexes the D2D control information from the modulated data information of the PUSCH when the D2D control information is received mapped to the symbol of the PUSCH.
  • the control information extractor 820 extracts the D2D control information by restoring data in the reverse order of the mapping process of the PUSCH in order to extract the D2D control information from the symbol of the PUSCH.
  • the control information extractor 820 extracts new data indicator information as the D2D control information when the D2D control information is mapped to the DM-RS and received. At this time, the control information extracting unit 820 extracts new data identifier information of one bit as two-dimensional control information using two parameter values. Since the control information extracting unit 820 does not know which of the two parameters, the DM-RS including the D2D control information has any value, the control information extracting unit 820 determines the final value after performing detection in all cases.
  • 19 is a flowchart of an embodiment for explaining a method of operating a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • a resource structure is set to include at least one resource pool having a plurality of resource blocks based on a predetermined time (S900).
  • the bandwidth of the frequency axis includes L resource pools RP, and each resource pool RP is used by a predefined group.
  • the basic unit of the size of each resource pool is a resource block pair having N SC-FDM symbols on the time axis and M subcarriers on the frequency axis.
  • the size of the RP may vary depending on the number of groups and the bandwidth. For example, assuming B-RB for bandwidth and the predefined number of groups is G, the size of each resource pool becomes B / G RBs on the frequency axis. That is, the size of the resource block constituting each resource pool is the same.
  • the RP for each group is divided into a time axis. That is, during N1 TTI is set as RP1 for group 1, and as RP2 for group 2 during another N2 TTI.
  • the resource blocks included in the resource pool are shifted on a time axis every predetermined time to allocate a resource for a signal to be transmitted (S902).
  • the shifting of the resource blocks to the time axis shifts the resource blocks such that the shift interval of the resource pool is different from the shift interval of another resource pool.
  • each transmitting terminal repeatedly transmits its D2D data N times. Repeated transmission of such data should be transmitted together with New Data Indicator (NDI) or Redundancy Version (RV) control information at the transmitting terminal so that the receiving terminal can perform chase combining or incremental redundancy (IR).
  • NDI New Data Indicator
  • RV Redundancy Version
  • IR incremental redundancy
  • a shift pattern shifting only one by one in the time axis between adjacent RPs is assumed, but various shift patterns may exist.
  • a transmitting terminal that wants to perform broadcast communication instead of a groupcast may transmit control information and data information generated through a broadcast ID instead of a group ID from its resource pool. When performing broadcast communication, the receiving terminal should always attempt to decode using two IDs, group ID and broadcast ID, and decode all resources.
  • the resource pool L (RPL) can be used only by a transmitter that wants to broadcast, and the receiving terminal that performs groupcast communication always monitors the resource pool L (RPL) that performs broadcast communication with its own resource pool. )do.
  • the period in which the predetermined time is summed a certain number of times as a unit period it may be grouped by the unit period to allocate resources.
  • N1 TTI or N2 TTI is used as an example of a unit period
  • RP1 for group 1 is allocated during N1 TTI
  • RP2 for group 2 is allocated during another N2 TTI.
  • N1 and N2 may be the same size or may be operated differently.
  • the signal is transmitted to the receiving terminal by using the allocated resources (S904).
  • FIG. 20 is a block diagram of an exemplary embodiment 1000 for explaining an operation apparatus of a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • the resource structure setting unit 1010 and the resource allocating unit are shown. 1020 and a transmission interface unit 1030.
  • the resource structure setting unit 1010 sets a resource structure to include at least one resource pool having a plurality of resource blocks based on a predetermined time. As shown in FIG. 8A, the resource structure setting unit 1010 configures L resource pools RP based on the frequency axis, and defines each resource pool RP to be used by a predefined group. The resource structure setting unit 1010 allows a pair of resource blocks having N SC-FDM symbols on the time axis and M subcarriers on the frequency axis to form a resource pool, and these resource pools Make a resource structure. In addition, as shown in FIG. 8B, the resource structure setting unit 1010 divides the RP for each group by the time axis, sets N1 TTI as RP1 for group 1, and sets group 2 during another N2 TTI. Is set as RP2.
  • the resource allocator 1020 allocates a resource for a transmission signal by shifting the resource blocks included in the resource pool on a time axis every predetermined time.
  • the shift control unit 1020 shifts the resource blocks such that the shift interval of the resource pool is different from the shift interval of another resource pool.
  • the resource allocator 1020 has a predefined time shift pattern for each of the resource pools.
  • RP1 resource blocks of resource pool 1
  • RP2 resource blocks of resource pool 2
  • the resource allocator 1020 may allocate a resource by grouping the unit periods in a unit cycle when the predetermined time sums up a predetermined number of times. As shown in FIG. 8B, when N1 TTI or N2 TTI is used as an example of a unit period, if the RP for each group is divided into time axes, RP1 for group 1 is allocated during N1 TTI, and then again. Allocate RP2 for group 2 during another N2 TTI. In this case, the resource allocator 1020 may allocate N1 and N2 to the same size or operate differently.
  • the transmission interface unit 1030 transmits a signal to the receiving terminal by using the allocated resource.
  • an operating device of a transmitting terminal through resource allocation of device to device (D2D) communication may include D2D control information for the D2D communication, including physical downlink control channel (PDCCH), physical uplink shared channel (PUSCH), and DM- A mapping processor configured to map at least one of RS (Demodulation-Reference Signals); And a transmitter for transmitting the D2D control information mapped to at least one of the PDCCH, the PUSCH, and the DM-RS to a receiving terminal.
  • D2D control information for the D2D communication including physical downlink control channel (PDCCH), physical uplink shared channel (PUSCH), and DM- A mapping processor configured to map at least one of RS (Demodulation-Reference Signals);
  • RS Demodulation-Reference Signals
  • the mapping processor maps the D2D control information to a symbol of the PDCCH
  • the mapping processor adds at least one of a groupcast ID and a broadcast ID for the group defining the range of the D2D communication to the D2D control information.
  • the apparatus may further include a group information adding module, and the D2D control information to which the groupcast ID or the broadcast ID is added may be mapped to a symbol of the PDCCH.
  • the D2D control information includes resource block assignment information, Modulation and Coding Scheme (MCS) information, redundancy version information, new data indicator information, and DM-RS (Demodulation-Reference).
  • MCS Modulation and Coding Scheme
  • DM-RS Demodulation-Reference
  • One or more of cyclic shift information for a signal and orthogonal complementary code (OCC) index information may be included.
  • the group information adding module may add masking one of the groupcast ID and the broadcast ID to a cyclic redundancy code (CRC) to the D2D control information.
  • CRC cyclic redundancy code
  • the mapping processor may include: a first convolutional coding module configured to convolutionally code the D2D control information added with the groupcast ID and the broadcast ID; A first rate matching module for matching a rate for the convolutionally coded D2D control information; A scrambling module for scrambling the D2D control information whose rate is matched using any one of the groupcast ID and the broadcast ID; A first modulation module for modulating the scrambled D2D control information; An interleaving module for interleaving the modulated D2D control information; And a cyclic shift module for group-specific cyclic shift of the interleaved D2D control information.
  • the mapping processor may include: a second convolutional coding module configured to convolutionally code the D2D control information when the D2D control information is mapped to a symbol of the PUSCH; A second rate matching module for matching a rate for the convolutionally coded D2D control information; A second modulation module for modulating the D2D control information with matching data rates; And a multiplexing module for multiplexing the modulated D2D control information with the modulated data information of the PUSCH.
  • the D2D control information includes resource block assignment information, Modulation and Coding Scheme (MCS) information, redundancy version information, new data indicator information, and DM-RS (Demodulation-Reference).
  • MCS Modulation and Coding Scheme
  • DM-RS Demodulation-Reference
  • One or more of cyclic shift information for a signal and orthogonal complementary code (OCC) index information may be included.
  • the multiplexing module may map the D2D control information to symbols nearest to the demodulation-reference signals (DM-RSs) of the PUSCH.
  • DM-RSs demodulation-reference signals
  • the mapping processor may map new data indicator information as the D2D control information when the D2D control information is mapped to the DM-RS.
  • the mapping processor may use a parameter value having a size of 1 bit as the new data identifier information.
  • an operation apparatus of a receiving terminal through resource allocation of device to device (D2D) communication may include: D2D control information for the D2D communication includes physical downlink control channel (PDCCH) and physical uplink shared (PUSCH).
  • D2D control information for the D2D communication includes physical downlink control channel (PDCCH) and physical uplink shared (PUSCH).
  • a receiver configured to receive at least one of the PDCCH, the PUSCH, and the DM-RS to which the D2D control information is mapped when it is mapped and transmitted to at least one of CHannel) and Demodulation-Reference Signals (DM-RS);
  • DM-RS Demodulation-Reference Signals
  • a control information extracting unit configured to extract at least one of the received PDCCH, the PUSCH, and the DM-RS to extract the D2D control information.
  • the control information extracting unit extracts at least one of a groupcast ID and a broadcast ID for a group defining a range of the D2D communication from the symbols of the PDCCH when the D2D control information is received mapped to the symbols of the PDCCH. can do.
  • the control information extractor may extract and extract the D2D control information from the modulated data information of the PUSCH when the D2D control information is received mapped to a symbol of the PUSCH.
  • the control information extracting unit may extract new data indicator information as the D2D control information when the D2D control information is received mapped to the DM-RS.
  • the control information extracting unit may extract the new data identifier using a parameter value having a size of 1 bit.
  • an operating device of a transmitting terminal through resource allocation of device to device (D2D) communication in a wireless communication system may include at least one resource pool having a plurality of resource blocks (Resouce Blocks) based on a predetermined time period.
  • a resource structure setting unit for setting a resource structure to include a Resouce Pool;
  • a resource allocator for allocating a resource for a signal to be transmitted by shifting the resource blocks included in the resource pool on a time axis every predetermined time;
  • a transmission interface unit for transmitting the signal to a receiving terminal by using the allocated resource.
  • the resource allocator may shift the resource blocks such that the shift interval of the resource pool is different from the shift interval of another resource pool every predetermined time.
  • the resource allocator may allocate a resource by grouping the unit periods in a unit cycle when the predetermined time sums up a predetermined number of times.
  • an apparatus for operating a receiving terminal through resource allocation of device to device (D2D) communication in a wireless communication system may include: a receiving interface unit that interfaces reception of a signal transmitted from a transmitting terminal; When a resource for a signal is allocated according to a resource structure including at least one resource pool having a plurality of resource blocks based on a predetermined time, the transmitting terminal through the allocated resource A control unit controlling to receive the signal from the computer; And a decoder for decoding the received signal.
  • D2D device to device
  • the allocated resources may be allocated by grouping the unit periods when the periods in which the predetermined time is added up a predetermined number of times are unit cycles.
  • the control unit determines whether the signal is information related to its own group when the signal is transmitted through the allocated resource grouped by the unit period, and if the signal corresponds to information related to its own group, the control unit detects the signal. Can be controlled to receive.
  • the controller may determine whether the signal is information related to its group by using the system frame information when receiving the system frame information indicating information on the allocated resource grouped by the unit period from the transmitting terminal. Can be.
  • the controller may control to switch to the standby mode when the signal is not information related to its own group when the signal is transmitted through the allocated resource grouped by the unit period.
  • an apparatus for operating a transmitting terminal through resource allocation of device to device (D2D) communication in a wireless communication system may include: a signal receiving unit configured to receive signals for the D2D communication for a predetermined time; An energy level detector for detecting an energy level of each of the resource blocks corresponding to the signals received during the predetermined time; And a transmission timing controller configured to determine a transmission timing of data for the D2D communication according to a congestion class corresponding to the detected energy levels.
  • D2D device to device
  • the transmission timing controller includes an energy level comparison module for comparing the energy levels with a predetermined threshold value; A congestion class determining module configured to determine the congestion class according to a result of comparing the energy levels with the predetermined threshold value; And a timing determination module that determines the transmission timing corresponding to the determined congestion class.
  • the transmission timing controller may increase a transmission window size of the transmission timing as the degree of congestion according to the determined congestion level increases.
  • 21 is a flowchart of an embodiment for explaining a method of operating a reception terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • a resource for a signal is allocated according to a resource structure including one or more resource pools having a plurality of resource blocks based on a predetermined time, and is a unit in which the predetermined time is summed up a certain number of times.
  • a period when the resource is allocated by grouping by the unit period, when a signal is transmitted through the allocated resource grouped by the unit period, it is determined whether the signal is information related to its own group (S1050).
  • the process of determining whether the signal is information related to its own group includes receiving the system frame information indicating the information about the allocated resource grouped by the unit period from the transmitting terminal and using the system frame information. Determines whether is information related to its own group.
  • decoding may be performed, and when the information is not related to its own group, it may be switched to the idle mode during the N-K TTI.
  • the transmitting terminal transmits the MIB to the receiving terminal, such as a MIB (Master Information Block) that the base station broadcasts to the terminals existing in the cell that it manages
  • the receiving terminal uses the system frame number / frame number in each TTIs. It is determined whether the transmitted signal corresponds to information related to its own group.
  • step S1050 if the signal corresponds to information associated with its group, the signal transmitted from the transmitting terminal is received through the allocated resource (S1052).
  • the receiving terminal may detect information related to a group to which it belongs or information related to a group to which it should communicate, although it is not a group to which it belongs. In this case, the corresponding data is received during the NK TTIs without switching to the idle state.
  • step S1052 the received signal is decoded (S1054).
  • step S1050 when the signal is transmitted through the allocated resources grouped by the unit period, if the signal is not information related to its own group, the signal is switched to an idle mode (S1056).
  • the receiver receives a signal during the first K TTI period, performs decoding, and then switches to the idle mode during the N-K TTI if it is not related to its group.
  • FIG. 22 is a block diagram of an embodiment for explaining an operation apparatus of a receiving terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • the receiving interface unit 1060, the control unit 1070, and the decoder 1080 are shown in FIG. ).
  • the reception interface unit 1060 interfaces reception of a signal transmitted from a transmission terminal.
  • the controller 1070 may allocate the allocated resource. Through the control to receive the signal from the transmitting terminal.
  • the allocated resources are allocated by grouping the unit periods when the periods in which the predetermined time is added a predetermined number of times are unit cycles. In this case, when the signal is transmitted through the allocated resource grouped by the unit period, the controller 1070 determines whether the signal is information related to its own group, and the signal corresponds to information related to its own group. Control to receive the signal.
  • the controller 1070 determines whether the signal is information related to its own group by using the system frame information when receiving system frame information indicating information on the allocated resource grouped by unit period from the transmitting terminal. .
  • the control unit 1070 uses a system frame number / frame number in each TTIs It is determined whether the transmitted signal corresponds to information related to its own group. If the signal corresponds to information associated with its group, the controller 1070 controls to receive the signal transmitted from the transmitting terminal through the allocated resource. As shown in FIG. 8B, the controller 1070 detects a signal in the first K TTIs and then displays information related to the group to which it belongs, or information related to the group to which it should communicate, although it is not the group to which it belongs. If it detects it, it does not switch to idle state and receives the data during NK TTIs.
  • MIB Master Information Block
  • the controller 1070 controls to switch to the standby mode if the signal is not information related to its group.
  • the controller 1070 receives a signal during the first K TTI interval and decodes the signal at each RP, and then switches to the idle mode during the NK TTI when the information is not related to its group. .
  • Decoder 1080 decodes the received signal.
  • 23 is a flowchart of another embodiment for explaining a method of operating a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention.
  • the energy levels of each of the resource blocks corresponding to the signals received during the predetermined time are detected (S1102).
  • the transmission timing of the data for the D2D communication is determined according to the congestion level corresponding to the detected energy levels (S1104).
  • FIG. 24 is a flowchart of an exemplary embodiment for explaining a process of determining transmission timing according to the congestion class illustrated in FIG. 23.
  • TTI transmission time interval
  • the congestion level is determined according to the comparison result of the energy levels and the predetermined threshold value (S1202).
  • Congestion rating is 2 levels of high / low, 3 levels of high / medium / low, or Level 1, Level 2, Level 3, Level 4,. It can be set in four or more steps, and the grade can be adjusted as needed. For example, in the second stage in which the congestion class corresponds to (a) of FIG. 10, the number of resource blocks having an energy level below a certain threshold is greater than or equal to X, or the resource blocks having energy levels above a certain threshold. If the number is less than or equal to X, you can determine that the congestion rating is low. However, on the contrary, it can be determined that the congestion rating is high.
  • the congestion grade when the number of resource blocks having an energy level below a certain threshold is greater than or equal to Y [%] of all resource blocks, or when the number of resource blocks having an energy level above a certain threshold is less than or equal to Y [%] among all resource blocks. It can be determined that the congestion level is low. However, on the contrary, it can be determined that the congestion rating is high. In addition, even when the congestion grade is three or four or more levels, the congestion grade may be determined in the same manner as described above.
  • the transmission timing corresponding to the determined congestion class is determined (S1204).
  • a transmission window size of the transmission timing is increased.
  • the transmission window size is preset according to the congestion class. That is, in the case of the second stage in which the congestion class corresponds to (a) of FIG. 10, when the congestion class is low (No), collisions due to data transmission occur relatively less, thereby reducing the transmission window size. However, when the congestion level is high (Yes), collisions due to data transmission occur relatively frequently, thereby increasing the transmission window size. In addition, even when the congestion level is three or four or more levels, as the degree of congestion increases in the same manner as described above, the transmission window size of the transmission timing is increased.
  • FIG. 25 is a block diagram of another exemplary embodiment 1300 for explaining an operation apparatus of a transmitting terminal through resource allocation of D2D communication in a wireless communication system according to the present invention, and includes a signal detector 1310 and an energy level detector. 1320 and the transmission timing controller 1330.
  • the signal detector 1310 receives signals for the D2D communication for a predetermined time and transmits the received signal to the energy level detector 1320.
  • KTTI transmission time interval
  • the transmission timing controller 1330 determines a transmission timing of data for the D2D communication according to a congestion class corresponding to the detected energy levels.
  • FIG. 26 is a block diagram of an exemplary embodiment for explaining the transmission timing controller illustrated in FIG. 25 and includes an energy level comparison module 1400, a congestion class determination module 1410, and a timing determination module 1420.
  • the energy level comparison module 1400 compares the energy levels with a predetermined threshold value and transmits the result of the comparison to the congestion grade determination module 1410. For example, the energy level comparison module 1400 may detect the energy levels of the resource blocks belonging to each resource pool during a transmission time interval (KTTI) period of 1 TTI. Compare the value with the size.
  • KTTI transmission time interval
  • the congestion grade determination module 1410 determines the congestion grade according to a result of comparing the energy levels with the predetermined threshold value, and transmits the determined result to the timing determination module 1420.
  • the congestion class determination module 1410 may include two levels of high / low, three levels of high / medium / low, or Level 1, Level 2, Level 3, Level 4,. Table information on a congestion class set in at least four levels, and a transmission window size corresponding to the congestion class are stored. Meanwhile, such table information may be stored in a separate storage space.
  • the congestion class determination module 1410 may determine that the number of resource blocks having an energy level equal to or lower than a certain threshold is greater than or equal to X If the number of resource blocks having an energy level greater than or equal to X is less than or equal to, the congestion class may be determined to be low, and conversely, the congestion class may be determined to be high. In addition, the congestion class determination module 1410 may determine that the number of resource blocks having an energy level of less than or equal to a predetermined threshold is greater than or equal to Y [%] of the total resource blocks, or the number of resource blocks having an energy level of more than or equal to a predetermined threshold is the total resource block.
  • the congestion grade determination module 1410 may determine the congestion grade in the same manner as described above.
  • the timing determination module 1420 determines the transmission timing corresponding to the determined congestion class.
  • the timing determining module 1420 increases the transmission window size of the transmission timing as the degree of congestion according to the determined congestion level increases.
  • the timing determination module 1420 reduces the transmission window size when the congestion class is low (No). However, if the congestion class is high (Yes), the transmission window size is increased. In addition, when the congestion level is three or four or more levels, the timing determination module 1420 increases the transmission window size of the transmission timing as the degree of congestion increases in the same manner as described above.
  • Operations according to an embodiment of the present invention may be implemented by a single control unit.
  • program instructions for performing various computer-implemented operations may be recorded on a computer-readable medium.
  • the computer-determinable medium may include program instructions, data files, data structures, and the like, alone or in combination.
  • the program instructions may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those skilled in the art.
  • Examples of computer readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs or DVDs, magnetic-optical media such as floppy disks and ROMs.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • a computer readable recording medium storing the computer program is also included in the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Abstract

Conformément à des modes de réalisation, la présente invention concerne un procédé et un appareil qui permettent de faire fonctionner un terminal de transmission/réception par l'intermédiaire d'une attribution de ressources d'une communication de dispositif à dispositif (D2D) dans un système de communication sans fil. Selon un mode de réalisation de la présente invention, un procédé pour faire fonctionner un terminal de transmission par l'intermédiaire d'une attribution de ressources d'une communication de dispositif à dispositif (D2D) dans un système de communication sans fil comprend les étapes consistant : à mapper des informations de commande D2D pour la communication D2D à au moins l'un quelconque parmi un canal de commande de liaison descendante physique (PDCCH), un canal partagé de liaison montante physique (PUSCH) et des signaux de référence de démodulation (DM-RS) ; à transmettre, à un terminal de réception, les informations de commande D2D mappées à au moins l'un quelconque parmi le PDCCH, le PUSCH et les DM-RS.
PCT/KR2014/012996 2014-01-29 2014-12-29 Procédé et appareil pour faire fonctionner un terminal de transmission/réception par l'intermédiaire d'une attribution de ressources d'une communication de dispositif à dispositif (d2d) dans un système de communication sans fil WO2015115738A1 (fr)

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KR10-2014-0011624 2014-01-29
KR20140011624 2014-01-29
KR1020140040003A KR102235637B1 (ko) 2014-01-29 2014-04-03 무선 통신 시스템에서 D2D(Device to Device) 통신의 자원 할당을 통한 송신/수신 단말의 동작 방법 및 장치
KR10-2014-0040003 2014-04-03

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WO2018103611A1 (fr) * 2016-12-09 2018-06-14 上海朗帛通信技术有限公司 Procédé et appareil pour équipement utilisateur et station de base
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CN110915274A (zh) * 2017-05-02 2020-03-24 株式会社Ntt都科摩 用户终端以及无线通信方法
CN111373687A (zh) * 2017-11-26 2020-07-03 高通股份有限公司 在无线通信中将上行链路控制信息映射到上行链路数据信道
CN111373687B (zh) * 2017-11-26 2022-12-09 高通股份有限公司 在无线通信中将上行链路控制信息映射到上行链路数据信道
CN112242967A (zh) * 2020-09-11 2021-01-19 北京邮电大学 一种多载波互补码单码循环移位多址接入方法
CN112242967B (zh) * 2020-09-11 2021-11-23 北京邮电大学 一种多载波互补码单码循环移位多址接入方法

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