WO2016032184A1 - Procédé permettant à un terminal de sélectionner une ressource, et terminal à cet effet dans une communication d2d - Google Patents

Procédé permettant à un terminal de sélectionner une ressource, et terminal à cet effet dans une communication d2d Download PDF

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Publication number
WO2016032184A1
WO2016032184A1 PCT/KR2015/008818 KR2015008818W WO2016032184A1 WO 2016032184 A1 WO2016032184 A1 WO 2016032184A1 KR 2015008818 W KR2015008818 W KR 2015008818W WO 2016032184 A1 WO2016032184 A1 WO 2016032184A1
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Prior art keywords
resource
terminal
radio
selecting
rpt
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PCT/KR2015/008818
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English (en)
Korean (ko)
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박승훈
정민영
구자헌
김준석
류현석
쉬에펑
Original Assignee
삼성전자 주식회사
성균관대학교산학협력단
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Publication of WO2016032184A1 publication Critical patent/WO2016032184A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a method for selecting a resource of a terminal in D2D communication and the terminal.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • Array antenna, analog beam-forming, and large scale antenna techniques are discussed.
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
  • cloud RAN cloud radio access network
  • D2D Device to Device communication
  • D2D Device to Device communication
  • CoMP Coordinated Multi-Points
  • Hybrid FSK and QAM Modulation FQAM
  • SWSC Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA non orthogonal multiple access
  • SCMA sparse code multiple access
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M machine to machine
  • MTC Machine Type Communication
  • IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
  • D2D communication technology that can improve the data transmission speed between neighboring terminals and reduce the transmission delay is considered as a suitable technology to support the proximity-based services between terminals.
  • a more effective radio resource determination method should be developed so that terminals performing D2D communication can achieve high communication performance.
  • the 3GPP standardization conference considers an environment in which terminals transmit data signals through data transmission resource blocks (RBs) configured based on orthogonal frequency division multiplexing (OFDM) to perform D2D communication of terminals.
  • each terminal should transmit a scheduling assignment (SA) message to neighboring terminals before the data transmission interval.
  • SA message includes resource pattern for transmission (RPT) information for the UE to use for data transmission, and the RPT is a radio resource of the radio resources to which the UE intends to transmit data among radio resources belonging to the data transmission interval.
  • RPT resource pattern for transmission
  • a subframe (or subframe) index (time side information) and a subchannel (or subchannel, at least one subcarrier) index (frequency side information) pairs may be configured.
  • UEs that want to transmit data transmit their data through radio resources on the time-frequency axis corresponding to the RPT in the SA message they send.
  • a D2D communication frame for D2D communication may have a period of 40 milliseconds (ms).
  • Each frame is composed of an SA transmission section 101 and a data transmission section 103.
  • the SA transmission section 101 is composed of at least one subframe and is a section in which D2D UEs transmit or receive SA messages.
  • the SA message is transmitted through an SA resource in the SA transmission interval 101, and the UE corresponds to an SA resource block corresponding to an arbitrary subchannel 105 and a subframe 107 among the plurality of SA resource blocks constituting the SA resource. Select to send the SA message.
  • the SA message is a message that D2D terminals wanting to transmit data to neighboring terminals, and includes their own identification information, timing advance information, and RPT information for data transmission. It includes.
  • the RPT is a resource pattern composed of one or more data transmission resource blocks, and as shown in FIG. 2, at least one corresponding to a specific subchannel 201 and a subframe 203 among available data transmission resources. It may be composed of resource blocks.
  • the data transmission section 103 is a section in which the terminals transmit or receive data.
  • the transmitting D2D terminals transmit data traffic using resource blocks belonging to the RPT included in the SA message transmitted by the transmitting D2D terminals.
  • Receiving D2D terminals receive data from the terminal that has passed the corresponding SA information through the resource blocks included in the RPT in the received SA information.
  • Interference refers to the effect that the reception quality of the signal is deteriorated because signals transmitted by two or more terminals using the same frequency and time resources overlap each other.
  • IBE means that the transmission power of the signal transmitted by the terminal is emitted in a band other than the intended frequency band, thereby interfering with other signals being transmitted in a frequency band not used by the terminal, thereby reducing the reception quality.
  • Half-Duplex means that the UE cannot simultaneously perform signal transmission and reception. Due to the Half-Duplex constraint, a terminal that transmits a signal cannot receive a signal of another terminal, which causes a problem in that the terminal cannot receive a signal of another terminal when the terminal simultaneously transmits a signal with another terminal.
  • the conventional SA resource selection method for SA transmission may be classified into a random selection technique and an energy sensing based selection technique.
  • the random selection technique is a technique in which the UE randomly selects one or more resource blocks among SA resources with equal probability and transmits its SA message.
  • the random selection technique since the UE has a high probability of selecting different SA resources for each SA transmission interval of each frame, there is an advantage in that collision between two UEs which have repeatedly selected the same SA can be resolved quickly.
  • all terminals randomly select resources there may be a problem in that there is a problem that resource blocks that are not used in a specific time interval or SA resources are repeatedly selected by other terminals every cycle.
  • the UE measures the energy of all SA resource blocks in the SA transmission interval of the D2D communication frame, selects an arbitrary SA resource block based on this, and then selects an SA selected in the SA transmission interval of the next D2D communication frame.
  • the SA message is transmitted through the resource block.
  • the measured energy of the SA resource is determined by the reception strength of the SA signal transmitted by the UEs occupying the corresponding SA resource block. The fact that the measured energy of the SA resource block is small is different from that of other UEs using the resource block. This may mean that the distance is far.
  • the UE can avoid overlapping with other UEs located in close proximity by selecting an SA resource block having the least detected energy, and improve the probability of avoiding interference that may be received by its SA message. have.
  • the UE selects only SA resource blocks in which less energy is sensed, interference effects due to IBE may be greatly affected to other terminals using different frequency resources at the same time.
  • geographically adjacent terminals have a similar energy level measured for each SA resource block, thus increasing the probability of selecting the same resource block and degrading communication performance.
  • the conventional D2D communication related studies do not consider the IBE effect and the Half-Duplex problem due to the signal transmission of the terminal. Therefore, when the conventional technology is applied to the actual system, the unexpected IBE and Half-Duplex problems were expected. There is a problem that performance is difficult to achieve. That is, in the conventional SA resource selection technology, since each UE measures the energy of SA resource blocks and selects the SA resource block in which the least energy is detected, the SA signals transmitted by the UE are different in the same time interval due to the IBE effect. It causes a problem that interferes with other terminals using the SA resource block located in the frequency. At this time, if two or more terminals using the same time interval exist in a geographically close location, signals of the corresponding terminals are difficult to decode because interference and IBE effects are very large.
  • 3 to 6 are diagrams for explaining a problem of the SA resource selection according to the prior art.
  • 3 and 4 are two terminals using the same resources in the channel environment according to the exponential path loss model of the path loss index of 4 and 20 meters (Fig. 3) and 100 meters (Fig. 4), respectively, (Black Point)
  • an area where the SINR of the stronger signal among the signals of the two terminals is guaranteed to be 1.5 dB or more.
  • 5 and 6 illustrate that the four terminals using the same resource are positioned at a distance of 20 meters (FIG. 5) and 100 meters (FIG. 6), respectively, and transmit signals with the same transmission power.
  • the region where the SINR of the strongest signal is guaranteed at least 1.5 dB is shown.
  • the SINR is lowered to 1.5 dB or less in an area of 200 meters or more away from the terminals.
  • the SINR is maintained at 1.5 dB or more even in some regions 500 meters or more away from the terminals.
  • FIG. 5 when four terminals using the same resource are located adjacent to each other within 20 meters, it can be seen that an area in which the SINR of the signal is guaranteed to be 1.5 dB or more is limited to a radius of about 50 meters. When placed 100 meters apart, it can be seen that the area that can guarantee a SINR of 1.5 dB or more is extended to a radius of 200 meters.
  • a method in which geographically adjacent terminals 701 use different frequency resource blocks belonging to the same time interval has been proposed. That is, in the prior art, a transmitting terminal in an area where a path loss of less than X dB occurs from a signal transmitted by another transmitting terminal, that is, a transmitting terminal adjacent to another transmitting terminal is in the same time interval as the resource transmitted by the other transmitting terminal. Belong to and transmit signals using different resources. This is to minimize the IBE effect that the terminals belonging to the entire network have on average and to improve the reception performance by having adjacent terminals use resources belonging to the same time interval.
  • two or more terminals using the same RPT should detect each other's signals, and if it is determined that a collision will occur based on the detection result, the corresponding terminals should be controlled to use different RPTs. .
  • one RPT has at least one data transmission resource block for every subframe, and any terminal may receive a signal from another terminal while transmitting a signal.
  • the terminal inserts one or more detection symbols into the RPT and data from other terminals in the detection symbol.
  • Techniques for detecting signals have been proposed. Referring to FIG. 8, in the related art, by observing another signal or energy detected from a resource in use during the discovery symbol interval 801 inserted into the RPT, it is possible to confirm whether another terminal is using the same resource at the same time. have. If the terminal detects another terminal using the same resource as its own through the detection symbol, the terminal selects a new resource (new RPT) in the next period and transmits its data signal.
  • new RPT new resource
  • the prior art since all terminals detecting a collision in the same resource reselect another resource in the next data transmission interval, all the terminals using the same resource stop the occupancy of the used resource and move to another RPT. Phenomenon occurs. As a result, in the next data transmission interval, previously used resources are not occupied by any terminal but become unused. 9 illustrates an example of unused resources that are generated when terminals detecting collisions reselect resources when the corresponding technology is applied.
  • the prior art has a problem in that the use efficiency of resources is reduced because some of the resources available for data transmission are used as detection symbols to listen to signals of other terminals. In particular, since the collision does not occur much in an environment where the number of terminals is small, the gain due to the insertion of the detection symbol is expected to be low.
  • the D2D receiving terminal should correctly receive the RPT information through the SA message, and can receive data without collision in the radio resource corresponding to the RPT.
  • the D2D receiving terminal may acquire the RPT information in an implicit manner or in an explicit manner through the SA message.
  • An implicit method is a method in which the mapping terminal between the SA resource block and the RPT is predefined in the system so that the receiving terminal acquires the RPT information based on the location of the resource block receiving the SA message.
  • the UE since the UE does not necessarily have to include RPT information in the SA message, the UE occupies the portion occupied by the RPT information for other main information.
  • inter-terminal synchronization on the mapping relationship between the SA resource block and the RPT is essentially required for the intrinsic method to operate normally.
  • two or more UEs using the same SA resource block have a problem in that collisions between data signals are inevitably generated when collisions occur between SA signals by using the same RPT during data transmission.
  • the transmitting terminal expresses the RPT information explicitly in the SA message, and the receiving terminal selects the RPT information to be used by the transmitting terminal sending the corresponding SA message using the RPT information explicitly indicated in the received SA message. How to obtain.
  • the external method is used, synchronization is not required for the mapping relationship between the SA resource and the RPT, and even if two or more terminals use the same SA, the RPT collision between the terminals can be avoided when the RPTs are different from each other. .
  • the transmitting terminal can transmit data using only a filter having a constant pass band.
  • a terminal using a channel with a strong fading phenomenon is continuously affected by fading, and thus, a performance difference due to RPT may occur relatively.
  • FIG. 10 a method of configuring one RPT to have a diagonal pattern on a time-frequency axis has been proposed.
  • the diagonal RPT is configured to increase the subchannel index by one as the subframe index increases by one.
  • Such diagonal RPTs have different subchannels for each subframe, so the performance variation of each RPT due to frequency selective fading is small.
  • the implementation is complicated in that the pass band of the filter must be changed every subframe.
  • RPTs may exist, but a more detailed design thereof may be required because data communication performance of D2D terminals may be improved or degraded according to a method of configuring RPTs.
  • An object of the present invention is to improve data reception performance by reducing the case where geographically adjacent transmitting terminals use the same RPT.
  • the present invention provides a method and apparatus for selecting adjacent SA resource blocks in different time intervals so that SA messages and RPT information exchange between transmitting terminals can be smoothly performed.
  • the present invention also provides a method and apparatus for identifying an RPT by identifying a different terminal using the same RPT as the terminal and avoiding collision between each other accordingly.
  • the resource selection method is a resource selection method of a terminal in device-to-device communication, and energy of each radio resource in a scheduling assignment (SA) message transmission interval. Selecting an SA transmission resource for SA message transmission based on the measurement result; in the data transmission interval, based on an energy measurement result of at least a portion of the data transmission resource constituting an arbitrary transmission resource pattern, performing data transmission Selecting a data transmission resource for the data; and transmitting the SA message and the data through the selected SA resource and the selected data, respectively.
  • SA scheduling assignment
  • the terminal according to the present invention is a terminal for performing a resource selection in device to device communication, the communication unit for transmitting and receiving data and the scheduling assignment (SA) message transmission interval, the energy measurement of each radio resource Based on the result, the SA transmission resource for the SA message transmission is selected, and in the data transmission interval, data for data transmission based on an energy measurement result for at least a portion of the data transmission resource constituting an arbitrary transmission resource pattern. And a control unit selecting a transmission resource and controlling to transmit the SA message and the data through the selected SA resource and the selected data, respectively.
  • SA scheduling assignment
  • the method and apparatus for resource selection according to the present invention increases SA message and data transmission / reception performance by allowing terminals to efficiently exchange SA messages and prevent a plurality of terminals from selecting the same RPT in an SA message transmission interval.
  • 1 is a diagram showing the structure of a D2D communication frame.
  • FIG. 2 is a diagram for explaining an RPT in D2D communication.
  • 3 to 6 are diagrams for explaining a problem of the SA resource selection according to the prior art.
  • FIG. 7 is a view for explaining a SA resource selection method according to the prior art.
  • FIG. 8 is a view for explaining a data signal detection method of another terminal in the RPT according to the prior art.
  • FIG. 9 is a diagram illustrating a resource unused problem occurring in the data signal detection method according to the prior art.
  • FIG. 10 is a view showing the RPT of the diagonal pattern according to the prior art.
  • FIG. 11 is a diagram illustrating a structure of an SA transmission interval according to the present invention.
  • FIG. 12 is a view showing a structure of a bundle of frames in which a plurality of D2D frames is combined according to the present invention.
  • FIG. 13 is a diagram for explaining a method of selecting SA resources according to the present invention.
  • FIG. 14 illustrates a case in which resource blocks belonging to the set R ⁇ 1 do not exist in an embodiment of the present invention.
  • FIG. 15 is a diagram illustrating a case in which a resource block belonging to a set R ⁇ 2 does not exist in an embodiment of the present invention.
  • FIG. 16 illustrates that an SA resource block located on a subframe different from all SA resource blocks included in the set R ⁇ 2 exists among at least one SA resource block included in the set R ⁇ 1 according to an embodiment of the present invention.
  • FIG. 7 illustrates a case in which no resource block located in the same subchannel as at least one of at least one SA resource block included in R ⁇ 2 exists.
  • FIG. 17 illustrates a resource block located in the same subchannel as at least one of at least one SA resource block included in a set R ⁇ 2 from among at least one SA resource block included in a set R ⁇ 1 according to an embodiment of the present invention; Although present, there is a diagram showing a case in which there is no SA resource block located on a subframe different from all SA resource blocks included in the set R ⁇ 2 .
  • FIG. 18 is located in the same subchannel as at least one of the at least one SA resource blocks included in the set R ⁇ 2 among the at least one SA resource blocks included in the set R ⁇ 1 in an embodiment of the present invention, and the set R FIG. 4 illustrates a case in which SA resource blocks located on subframes different from all SA resource blocks included in ⁇ 2 do not exist.
  • 21 is a view showing a secondary RPT structure according to the present invention.
  • FIG. 22 is a view for explaining an embodiment of increasing the detection unit RPT according to the present invention.
  • FIG. 23 is a flowchart illustrating a method of selecting a SA resource block according to the present invention.
  • 24 is a flowchart illustrating a data resource block selection and reselection method according to the present invention.
  • 25 is a flowchart illustrating a resource selection method for D2D communication according to the present invention.
  • 26 is a diagram illustrating an operation according to the present invention when two different terminals collide with each other using the same RPT.
  • FIG. 27 is a diagram illustrating an operation according to the present invention when a collision occurs in a data transmission interval due to a Half-Duplex constraint.
  • FIG. 28 is a diagram illustrating a case where both the SA selection method and the RPT selection method of the present invention are applied.
  • 29 is a diagram illustrating the number of SA message decoding times of receiving terminals according to a distance from a transmitting terminal.
  • FIG. 30 is a diagram illustrating an SINR CDF of a data signal received by each terminal in a data transmission interval.
  • 31 is a diagram illustrating an average SINR CDF of signals received by terminals.
  • 33 is a block diagram showing the configuration of a terminal according to the present invention.
  • the present invention is directed to device-to-device (D2D) communication that performs direct communication between adjacent terminals.
  • Terminals are controlled by an infrastructure consisting of a centralized access point such as a base station or an access point (AP) or select a radio resource to be used by a distributed method and use a corresponding radio resource to connect with neighboring terminals.
  • Perform D2D communication Since D2D communication can accommodate locally occurring wireless data traffic without relaying infrastructure, there is an advantage that it can solve the problem of overload of traffic concentrated in the base station or AP. For this reason, standardization organizations such as 3GPP and IEEE are pushing for standardization of D2D communication based on LTE-advanced or Wi-Fi.
  • the present invention is applicable to a wireless communication terminal device capable of performing D2D communication.
  • the present invention provides a method for a terminal to identify available radio resource candidate groups and occupied radio resources of an adjacent terminal based on energy received for each SA transmission radio resource block, and the terminal through radio resource blocks identified in the radio resource identification step.
  • the SA resource selection method and the data resource RPT selection method proposed by the present invention enable UEs that can give strong interference and IBE effect to each other to select different resources, thereby enabling D2D SA signal reception in a wider area than the prior art.
  • the terminals using the same RPT it is possible to reduce signal collision and improve communication performance compared to the prior art.
  • Embodiments according to the present invention are described in connection with a transmitting device and a receiving device.
  • the transmitting device and the receiving device are referred to as a system, subscriber unit, subscriber station, mobile station, mobile, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, user device, or user equipment (UE). Can be.
  • the transmitting device and the receiving device may be cellular telephones, personal digital assistants (PDAs), handheld devices with wireless connection capabilities, computing devices or other processing devices connected to a wireless modem.
  • PDAs personal digital assistants
  • FIG. 11 is a diagram illustrating a structure of an SA transmission interval according to the present invention.
  • the D2D frame according to the present invention includes an SA transmission section 101 and a data transmission section 103.
  • an SA resource included in an SA transmission interval 1101 is divided into a plurality of SA resource blocks divided based on OFDM.
  • One SA transmission interval 1101 is composed of N f subchannels 1103 and N tSA subframes 1105, and one SA resource block includes one subchannel 1103 and one subframe 1105. ),
  • One SA transmission interval 1101 is composed of a total of N f ⁇ N tSA SA resource blocks.
  • the present invention aims to minimize the effects of interference and IBE occurring between neighboring terminals by allowing the D2D transmitting terminals located at short distances to use SA resource blocks located at different times.
  • the SA transmission interval 1101 includes a plurality of subframes 1105.
  • the plurality of D2D frames 1201, 1203, and 1205 without changing the frame structure of the existing physical channel are illustrated.
  • a Frame of Bunch of Frames (BoF) 1207 logically combined may be used.
  • the BoF 1207 structure is a structure in which N BoFs of a plurality of D2D frames 1201, 1203, and 1205 are combined to logically reconstruct as one large frame.
  • SA transmission interval in BoF (1207) structure may be of a type that combines the N single BoF SA transmission interval constituting BoF N of sub-frames, respectively (1209, 1211, 1213) logically.
  • the UE may transmit the SA message only in the SA transmission intervals 1209, 1211, and 1213 without transmitting a signal in the data transmission interval during N BoF D2D frames.
  • the UEs to send the SA message select a SA resource block that is expected to occur relatively less interference or IBE effect based on the energy measured in the SA resource blocks to select the reception area of the SA message and data signal.
  • each terminal measures energy for all SA resource blocks belonging to a certain SA transmission interval 1101.
  • the terminal when the terminal initially enters the network, the terminal may measure energy for SA resource blocks in a D2D frame that is first started after joining the network. For example, referring to FIG. 13, in an environment in which N f ⁇ N tSA SA resource blocks are available, the UE measures energy for all SA resource blocks.
  • the UEs not intending to transmit data in the next D2D frame may measure energy for all resource blocks in every SA resource interval until data transmission is required. According to the above embodiments, whenever all resource block energy in the new SA resource interval is measured, the UE may store the measured energy value itself or an average value of energy measured in the recent N SA resource intervals.
  • UEs that want to transmit data in the next D2D frame are SA resource blocks belonging to the SA transmission section 1101 of the next D2D frame based on the energy measured for transmitting the SA message in the SA transmission section 1101 of the next D2D frame. Select one or more SA resource blocks.
  • the UE may select the SA resource block in consideration of only the energy measured in the last SA transmission interval immediately before the SA message transmission.
  • the terminal may select the SA resource block by averaging the energy measured in the recent N SA transmission intervals.
  • the SA resource block is adaptively adapted accordingly. Can be selected.
  • the energy value measured in the previous SA transmission interval and the energy value in the SA transmission interval when transmitting the actual SA message are different each time. Therefore, there is a drawback that the SA resource selection based on accurate energy sensing may not be achieved.
  • a relatively accurate energy sensing based SA resource selection may be made even in a channel environment or an environment in which the number of SA transmitting terminals is frequently changed.
  • the UE may select only the SA resources block by considering only the energy measured in the SA transmission interval immediately before the SA message transmission according to the network state or averaging the energy measured in the recent N SA transmission intervals.
  • the terminal determines a set R ⁇ 1 1301 of the resource blocks whose measured energy is equal to or less than the first threshold y1 (or lower x 1 %).
  • the UE measures energy for each of the SA resource blocks r nf and ntSA located in the n tSA subframe of the n f th subchannel , and the measured energy is less than or equal to the threshold 1 ( ⁇ 1) (or lower x 1 %).
  • R ⁇ 1 (r 1,2 , r 1, NtSA , r 2,1 , r 2,2 , r 4,1 , r Nr, 1 ⁇ .
  • the first threshold value may be preset in the terminal by a standard, or may be determined by the base station according to network conditions and inform the terminals.
  • the SA resource blocks belonging to the set R ⁇ 1 1301 may be resource blocks that allow a SA message transmitted through one of the corresponding SA resource blocks to be received at a receiving terminal according to an interference below an threshold value and an IBE effect.
  • the UE transmits an SA message using one of SA resource blocks belonging to the set R ⁇ 1 1301, so that a relatively small amount of interference and IBE effects on other SA messages whose SA messages are transmitted in the same time interval. You can let
  • the UE based on the energy measurement result as shown in FIG. 13, the set R ⁇ 2 of the resource blocks r nf, ntSA where the measured energy is greater than or equal to the second threshold ⁇ 2 (or higher x 2 %).
  • the second threshold value may be preset in the terminal by a standard, or may be determined by the base station according to network conditions and inform the terminals.
  • the SA resource blocks belonging to the set R ⁇ 2 1303 may be resource blocks that allow a SA message transmitted through one of the corresponding resource blocks to be received at a receiving terminal according to interference or an IBE effect above a threshold value.
  • the terminal transmits an SA message using one of SA resource blocks belonging to the set R ⁇ 2 1303, the terminal may cause a large interference and an IBE effect on the SA message of another terminal occupying the same resource block. .
  • the UE may select an SA resource block to be used for SA message transmission based on the set R ⁇ 1 1301 and the set R ⁇ 2 1303.
  • the terminal may be configured on a frequency and at least one of at least one SA resource block included in the set R ⁇ 2 1303 among at least one SA resource block included in the set R ⁇ 1 1301.
  • An SA resource block that is the same and does not overlap in time with all SA resource blocks included in the set R ⁇ 2 1303 is selected. That is, the terminal is located in the same subchannel as at least one of the at least one SA resource blocks included in the set R ⁇ 2 1303 among the at least one SA resource blocks included in the set R ⁇ 1 1301. All SA resource blocks included in ⁇ 2 1303 are selected, and the SA resource blocks located on different subframes are selected.
  • the UE determines whether there is an SA resource block belonging to the same subchannel as at least one of at least one SA resource block included in the set R ⁇ 2 1303 for the SA resource blocks belonging to the R ⁇ 1 1301. Determine whether or not. If the at least one SA SA resource blocks that belong to the same sub-channel with at least one of the resource blocks in the set of R ⁇ 2 (1303) exist, the terminal is intended that all matter contained in the SA set in the resource block R ⁇ 2 (1303) It is determined whether there is an SA resource block located in a subframe different from the SA resource blocks.
  • the UE selects these SA resource blocks as the final selection candidate group 1305.
  • the final selection candidate group 1305 is ⁇ r 2 , 1 , r 4, 1 ⁇ .
  • the terminal selects an SA resource block to be used by the terminal from the final selection candidate group 1305.
  • the terminal may select an SA resource block using any one of a random selection method and a priority based selection method.
  • the random selection method is a method of randomly selecting one or more SA resource blocks among SA resource blocks belonging to the final selection candidate group.
  • the priority-based selection method is a method of selecting a final SA resource block according to a priority that the UE has in itself.
  • the terminal when the terminal is controlled by the base station, the terminal selects an SA resource block among all candidate group resource blocks, and when operating in a distributed manner, one of resource blocks belonging to a limited frequency or time domain. Select.
  • the terminal may finally select one of ⁇ r 2,1 , r 4,1 ⁇ as the final selection candidate group 1305, or select one according to priority to use as the final SA resource block.
  • the resource blocks that are not present one of the SA resource blocks 1403 belonging to a subframe that is not identical in time to the SA resource blocks belonging to the set R ⁇ 2 1401 is arbitrarily selected.
  • the UE can expand its SA signal reach by avoiding the same-time SA resource occupancy with other UEs that can give and receive relatively many IBE effects with the UE.
  • a set of R ⁇ 2 1401 If there is no resource block belonging to a subframe not overlapping with the UE, the UE is located in the same subframe as the SA resource block having the lowest measured energy among SA resource blocks belonging to R ⁇ 2 1401 and is located in another subchannel. Select an SA resource block. Or the terminal may select the SA resource blocks are located in the most subchannels SA resource blocks belonging to the SA resource blocks are located at the lower frame portion R ⁇ 2 (1401) belonging to the R ⁇ 2 (1401).
  • the UE may arbitrarily select an SA resource block. .
  • the terminal selects one SA resource block among SA resource blocks belonging to the set R ⁇ 1 1501.
  • the terminal may select an SA resource block having the lowest measured energy or select an SA resource block belonging to a subframe having the lowest measured energy.
  • the UE selects one SA resource block having the lowest energy among SA resource blocks belonging to the set R ⁇ 1 1501.
  • the UE obtains the average energy of the SA resource blocks for each subframe, and the SA belongs to the set R ⁇ 1 simultaneously while belonging to the lowest subframe. Randomly select one of the resource blocks.
  • ⁇ set R ⁇ 1 at least one of the SA resource blocks in a, set R located on all SA resource block and the other sub-frame included in the ⁇ 2 SA resource block of at least one SA included in the present one, a set R ⁇ 2 contained in When there is no resource block located in the same subchannel as at least one of the resource blocks
  • a set R when ⁇ 2 (1603) the at least one SA resource blocks are resource blocks located in the same sub-channel and at least one is not present during contained in the terminal is all the SA resource blocks included in the set R ⁇ 2 (1603)
  • One of the resource blocks 1605 not located in the same subframe may be arbitrarily selected.
  • set R ⁇ 1 at least one of the SA resource blocks from, at least one of the SA resource blocks of resource blocks located in the same sub-channel with at least one in the set of R ⁇ 2 included in the present one, included in the set R ⁇ 2 There is no SA resource block located on a subframe different from all SA resource blocks.
  • one of the at least one SA resource blocks included in the set R ⁇ 2 1703 may be used. If there is a resource block located in the same subchannel as at least one, but there is no SA resource block located on a subframe different from all SA resource blocks included in the set R ⁇ 2 1703, the terminal is set R ⁇ 2 ( Any one of the resource blocks 1705 of the set R ⁇ 1 1701 located in the subframe having the smallest number of SA resource blocks included in 1703 may be arbitrarily selected.
  • set R ⁇ 1 at least one of the SA resource blocks in a
  • set R ⁇ 2 at least one SA located among the resource blocks in the same sub-channel with at least one, all the SA resource blocks included in the set R ⁇ 2 included in included in the If there is no SA resource block located on another subframe
  • the present invention defines an SA resource reselection period (T1) having a longer time than one frame period, and the UE is to determine the SA resource block according to the contents of the present invention after the T1 time.
  • Reselect. T1 may be a value arbitrarily determined by the terminal at the beginning of data transmission.
  • the UE When the UE transmits the SA message through a specific SA resource block in the reselection process, a problem due to the Half-Duplex constraint occurs. Accordingly, when reselecting an SA resource block, the UE measures energy for the remaining SA resource blocks except for SA resource blocks belonging to the subframe in which the SA message is currently transmitted, and reselects one of them through the operation of the present invention. do. Alternatively, the UE may prevent the Half-Duplex constraint and extend the reselectable SA resource block candidate group to all SA resource blocks by not transmitting an SA message in a frame period immediately before performing the SA reselection.
  • FIG. 19 is a view showing an RPT structure according to the present invention.
  • the entire data transmission interval has a time length of N tDATA subframes and a frequency bandwidth of N f subchannels.
  • the data transmission interval is N RPTs 191 may be configured with each RPT 1901, and each RPT 1901 may include at least one data resource block located on any subchannel and any subframe.
  • each of the RPTs 1901 is for each subchannel ( N tDATA / N RPT ) resource blocks located in consecutive subframes on a time axis or ( N tDATA / N located in discrete subframes).
  • RPT may be composed of resource blocks.
  • each RPT 1901 is divided into M sub-RPTs 1901, 1905, 1907, and each sub RPT 1901, 1905, 1907 is N tDATA / ( M ⁇ N RPT ) consecutive It consists of subframes that are or discontinuous.
  • the terminal may allocate at least some of the M sub-RPTs 1901, 1905, and 1907 to the detection sub-RPTs 1403, and assign the rest to the transmission sub-RPTs 1905 and 1907.
  • the UE may detect the neighboring signal in the detection unit RPT 1901 and transmit data or perform RPT reselection in the transmission units RPT 1905 and 1907 according to the detection result.
  • the UE performing data transmission selects an SA resource block according to the SA resource block selection method according to an embodiment of the present invention and then minimizes the same RPT duplication selection problem with other UEs through the RPT and the sub-RPTs to thereby RPT. To select.
  • the terminal that wants to transmit data selects the RPT that it intends to use to transmit data resources.
  • the UE may select the RPT using an implicit method or an implicit method.
  • the terminal may determine the RPT based on the mapping relationship between the SA resource block and the RPT defined in the system.
  • the terminal may arbitrarily select one of RPTs not used by other terminals based on RPT information of other terminals included in the SA message received in the previous SA transmission interval. In this case, the terminal may select an RPT in which the least energy is measured on average among RPTs not used by other terminals.
  • the probability that the terminal uses a data resource block overlapping with another terminal may be reduced, thereby improving communication performance.
  • the terminal selecting the RPT transmits the RPT information selected by the terminal through the current SA transmission interval to the neighboring terminals in the SA message.
  • the UE After the UE transmits the SA message, it transmits data through some of the data resource blocks belonging to the RPT selected by the UE.
  • the terminal for the RPT and the sub own are M unit RPT from and they transmit data m 1 of sub-RPT (transmission portion RPT) (2101) of data belonging to the selected RPT according to the RPT structure, as shown in Figure 21 Select ( M - m 1 ) sub-RPTs (detection part RPT) 2103 not to be transmitted.
  • the UE may set m 1 to a level equal to or similar to M if it has a high priority in performing its communication or if a high QoS level is required. As a result, the UE can reduce the probability of detecting the future use of RPT duplication, and as a result, the RPT reselection does not occur frequently, thereby reducing the overhead incurred by reselecting the RPT.
  • the terminal selecting the RPT transmits the selected RPT information and the sub-RPT information through the current SA transmission interval to the neighboring terminals in the SA message.
  • the terminal transmits its own data through a resource block belonging to a secondary RPT 2101 to transmit data, and receives data signals from other terminals through the remaining secondary RPTs 2103. If the energy of the signal received from any detection unit RPT 2103 is greater than or equal to the threshold ⁇ 1 (or higher x%), the UE may know that there is another UE using the same RPT as its own. have.
  • the terminal may randomly generate a number between 0 and 1 and may perform RPT reselection when the randomly generated number is smaller than P.
  • the probability P may be predefined in the system, and the terminal may be calculated by an empirical method.
  • the present invention can provide an opportunity for stable use of one RPT to terminals that have continuously changed the data RPT for a long period of time.
  • the terminal may arbitrarily select one of the available RPTs.
  • the terminal may select RPTs having a measured energy less than or equal to the threshold ⁇ 2 (or lower y%) as a reselectable RPT candidate group, and may arbitrarily select any one of the selected RPT candidate groups.
  • the terminal may select the RPT with the lowest measured energy.
  • the next RPT being used is next. It is also used in the data transmission section.
  • the terminal may variably determine the number of transmitter RPT 2101 and detector RPT 2103. If the UE continuously transmits data using only m 1 transmission RPTs 2101 among the M sub-RPTs, a problem may occur that the efficiency of using data transmission resources may be reduced.
  • the terminal is shown in FIG. 21. As shown in FIG. 2, the number of transmission units RPT 1201 used to transmit data is increased by two m2 .
  • FIG. 23 is a flowchart illustrating a method of selecting a SA resource block according to the present invention.
  • a terminal first measures energy of SA resource blocks (2301).
  • a newly participating terminal in the network measures the energy for all SA resource blocks belonging to the SA transmission interval of the first frame starting after the participation. Thereafter, the UE measures energy levels of all SA resource blocks in the SA transmission interval of each frame.
  • the terminal selects an SA resource block to use based on the measured energy.
  • the UE may have a set R ⁇ 1 of SA resource blocks whose measured energy is less than or equal to a preset first threshold ⁇ 1 (or lower x 1 %) and the measured energy is greater than or equal to a preset second threshold ⁇ 2 (or A set R ⁇ 2 of SA resource blocks (upper 2 %) is determined (2305).
  • the first threshold value and the second threshold value may be preset in the terminal by a standard, or determined by the base station according to network conditions, and inform the terminals.
  • the idea of the present invention may be applied even if it is less than the first threshold value or more than the second threshold value. Can be.
  • the terminal selects an SA resource block based on the determined set R ⁇ 1 and the set R ⁇ 2 .
  • the UE is identical in frequency to at least one of the at least one SA blocks included in the set R ⁇ 2 among the at least one SA resource blocks included in the determined set R ⁇ 1 , and all SA resource blocks included in the set R ⁇ 2 . Select a SA resource block that does not overlap with each other.
  • the terminal determines whether an SA resource block included in the set R ⁇ 1 exists (2307). If there is no SA resource block included in the set R ⁇ 1 , the UE randomly selects one of all SA resource blocks (2309). In an embodiment, the terminal may select the SA resource block having the lowest measured energy based on the measured energy.
  • the UE determines whether the SA resource block included in the set R ⁇ 2 exists (2311). If there is no SA resource block included in the set R ⁇ 2 , the UE randomly selects one of the SA resource blocks included in the set R ⁇ 1 (2313). According to an embodiment, the terminal may select the SA resource block having the lowest measured energy among SA resource blocks included in the set R ⁇ 1 based on the measured energy.
  • the UE may have the same frequency as at least one of the at least one SA resource blocks included in the set R ⁇ 2 among the at least one SA resource blocks included in the set R ⁇ 1 . It is determined whether there is an SA resource block located on the block (2315). That is, the terminal determines whether there is a subchannel including at least one SA resource block included in the set R ⁇ 1 and at least one SA resource block included in the set R ⁇ 2 .
  • the UE is in the set of R ⁇ 1 Among the at least one SA resource block, it is determined whether there is an SA resource block located at a time that is not the same as all SA resource blocks included in the set R ⁇ 2 (2317). That is, the terminal determines whether there is a subframe including only at least one SA resource block included in the set R ⁇ 1 .
  • the terminal randomly selects one of the corresponding SA resource blocks. Select (2319).
  • the terminal determines whether there is a subframe including only at least one SA resource block included in the set R ⁇ 1 .
  • the terminal randomly selects one of the corresponding SA resource blocks. Select (2323).
  • the mobile station included in the set R ⁇ 2 One of the SA resource blocks of the set R ⁇ 1 located in the subframe having the smallest number of SA resource blocks is randomly selected (2325).
  • the terminal transmits an SA message through the selected SA resource block (2327).
  • SA message information about the RPT to be used for data transmission by the terminal may be explicitly or implicitly included.
  • 24 is a flowchart illustrating a data resource block selection and reselection method according to the present invention.
  • a terminal first selects an RPT to use for data transmission (2401).
  • the terminal having data to be transmitted selects an RPT for resource blocks to be used by the terminal in the data transmission interval.
  • the terminal selects 1 transmission subRPT m 1 to actually transmit data among the M sub-RPTs belonging to the selected RPT and detection sub-RPTs ( M - m 2 ) to detect peripheral signals (2403).
  • the UE includes the RPT information used by the UE in the SA message and transmits the same to the neighboring terminals in the SA transmission interval (2405).
  • the SA message may include information about the RPT, either explicitly or implicitly.
  • the SA message may include information about the transmitter RPT and the detector RPT.
  • the terminal may select an SA resource block using the embodiment of FIG. 23 and transmit an SA message through the selected resource block.
  • the terminal transmits data through the transmission sub-RPT and senses the energy of the received signal through the remaining detection sub-RPT (2407).
  • the terminal determines whether the energy sensed by the RPT that it is using is greater than or equal to a preset threshold ⁇ (2409).
  • the terminal performs RPT reselection.
  • the terminal generates an arbitrary variable x within the range [0, 1] (2411). If x is less than or equal to the predefined probability P (2413), the UE returns to step 2401 to reselect an RPT to use. In this case, the UE may arbitrarily select one of the available RPTs or select the RPT having the lowest measured energy.
  • the terminal transmits data using the RPT currently being used (2415).
  • the terminal may change m 2 of the detection sub-RPTs to the transmission sub-RPT (2417).
  • the terminal repeats the above RPT selection and reselection until the data transmission is completed (2419).
  • RPT selection and reselection may be performed at every D2D communication frame or at a predetermined D2D communication frame interval. According to various embodiments of the present disclosure, if the number of detection unit RPTs becomes 0 due to repetition of the above process before data transmission is completed, the terminal may transmit data through all subRPTs belonging to the selected RPT. .
  • 25 is a flowchart illustrating a resource selection method for D2D communication according to the present invention.
  • a terminal first measures energy of SA resource blocks (2501).
  • a newly participating terminal in the network measures the energy for all SA resource blocks belonging to the SA transmission interval of the first frame starting after the participation. Thereafter, the UE measures energy levels of all SA resource blocks in the SA transmission interval of each frame.
  • the UE selects an SA resource block to use based on the measured energy.
  • the UE may have a set R ⁇ 1 of SA resource blocks whose measured energy is less than or equal to a preset first threshold ⁇ 1 (or lower x 1 %) and the measured energy is greater than or equal to a preset second threshold ⁇ 2 (or A set R ⁇ 2 of SA resource blocks (upper 2 %) is determined (2505).
  • the first threshold value and the second threshold value may be preset in the terminal by a standard, or determined by the base station according to network conditions, and inform the terminals.
  • the idea of the present invention may be applied even if it is less than the first threshold value or more than the second threshold value. Can be.
  • the terminal selects an SA resource block based on the determined set R ⁇ 1 and the set R ⁇ 2 .
  • the UE is identical in frequency to at least one of the at least one SA blocks included in the set R ⁇ 2 among the at least one SA resource blocks included in the determined set R ⁇ 1 , and all SA resource blocks included in the set R ⁇ 2 . And select the SA resource block that does not overlap in time (2507).
  • a specific embodiment in which the terminal selects a resource block is as described above.
  • the terminal selects an RPT to use for data transmission (2509).
  • the terminal may arbitrarily select an RPT to use for data transmission.
  • the terminal may select an RPT corresponding to the selected SA resource block.
  • the UE selects one transmission subRPT m 1 to actually transmit data and one detection subRPT ( M - m 2 ) to detect a peripheral signal among M sub-RPTs belonging to the selected RPT.
  • the UE includes the RPT information used by the UE in the SA message and transmits it to neighboring terminals in the SA transmission interval (2513).
  • the SA message may include information about the RPT, either explicitly or implicitly.
  • the SA message may include information about the transmitter RPT and the detector RPT.
  • the terminal transmits data through the transmission sub-RPT and senses the energy of the received signal through the remaining detection sub-RPT (2515). The terminal determines whether the energy sensed by the RPT that it is using is greater than or equal to the preset threshold ⁇ (2517).
  • the UE probabilistically performs RPT reselection (2519).
  • RPT reselection A specific embodiment of the UE reselecting the RPT is as described above.
  • the terminal performs data transmission until the data transmission is terminated using the selected RPT (2521).
  • the UEs decode SA messages transmitted in different time slots to obtain RPT information used by different UEs, and thus, select different RPTs to prevent collision of transmission resources. do.
  • the UE may avoid collision by arbitrarily reselecting the RPT in the next reselection period. Can be.
  • FIG. 27 when UEs transmit SA messages through a randomly selected SA resource selection every cycle, due to Half-Duplex constraints, UEs may collide in a data transmission interval using the same RPT. .
  • the UEs can detect the RPT collision and reselect the RPT through the RPT selection method of the present invention to avoid the collision in the data transmission interval.
  • UEs may improve decoding performance of SA messages by transmitting SA messages in different time slots.
  • the neighboring UE may acquire the RPT information reselected by the neighboring terminal through the SA to resolve the collision phenomenon.
  • 29 is a diagram illustrating an average SINR CDF of signals received by UEs as a performance evaluation of a resource selection method according to an embodiment of the present invention.
  • FIG. 29 shows the SA message decoding times of transmitting terminals according to the distance between terminals.
  • adjacent transmission terminals transmit SA signals through different time intervals, thereby decoding about 2.8 times as many SA signals as the prior art in an area within 1000 meters where communication is mainly performed.
  • Neighboring transmission terminals can improve signal reception performance of 8.5 dB in the data transmission interval compared to the prior art by acquiring RPT information of other neighboring transmission terminals and avoiding the use of the same RPT.
  • the proposed technique can prevent collisions between transmitted data signals by detecting the use of the same RPT by the UEs and selecting different RPTs. Therefore, the SINR of the data signal can be improved, and based on this, the average data rate per terminal can be improved by about 20% compared to the prior art as shown in FIG. 32.
  • 33 is a block diagram showing the configuration of a terminal according to the present invention.
  • the terminal 3300 includes a communication unit 3301 and a controller 3303.
  • the communication unit 3301 may transmit data to another terminal or receive data from another terminal.
  • the communication unit 3301 may include at least one communication module and an antenna.
  • the controller 3303 may control each component of the terminal 3300 including the communication unit 3301 for the resource selection operation and the D2D transmission and reception according to the present invention. The detailed operation of the controller 3303 has been described above.

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Abstract

La présente invention concerne un procédé permettant à un terminal de sélectionner une ressource, et un terminal à cet effet dans une communication de dispositif à dispositif (D2D). L'invention, qui se rapporte à un procédé permettant à un terminal de sélectionner une ressource dans une communication D2D, a trait à un procédé permettant à un terminal de sélectionner une ressource et à un terminal conçu pour exécuter ce procédé, le procédé comprenant les étapes qui consistent : à sélectionner, dans une section de transmission de message d'affectation d'ordonnancement (message de SA), une ressource de transmission de SA pour transmettre un message de SA sur la base d'un résultat de mesure d'énergie de chaque ressource sans fil ; à sélectionner, dans une section de transmission de données, une ressource de transmission de données servant à transmettre des données sur la base de résultats de mesure d'énergie pour au moins une partie d'une ressource de transmission de données constituant un schéma de ressources de transmission aléatoire ; et à transmettre le message de SA et les données au moyen de la ressource de SA sélectionnée et des données sélectionnées. La présente invention porte sur un procédé de communication prévu pour combiner un système de communication 5G, qui est destiné à prendre en charge un débit de données plus élevé qu'un système au-delà de la 4G, à la technologie de l'IoT, ainsi que sur un système à cet effet. Cette invention peut s'appliquer, sur la base de la communication 5G et des technologies liées à l'IoT, à des services fonctionnels tels que les maisons intelligentes, les bâtiments intelligents, les villes intelligentes, les voitures intelligentes ou les voitures connectées, ainsi qu'à des services associés aux soins de santé, à l'enseignement numérique, au commerce de détail, à la sécurité et à la sûreté.
PCT/KR2015/008818 2014-08-25 2015-08-24 Procédé permettant à un terminal de sélectionner une ressource, et terminal à cet effet dans une communication d2d WO2016032184A1 (fr)

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CN107889161A (zh) * 2016-09-30 2018-04-06 北京三星通信技术研究有限公司 传输控制信令和数据的方法及设备
WO2019027288A1 (fr) * 2017-08-03 2019-02-07 엘지전자 주식회사 Procédé et appareil pour calculer des informations de télémétrie par un terminal dans un système de communication sans fil prenant en charge une communication de dispositif à dispositif
US11032789B2 (en) 2017-08-03 2021-06-08 Lg Electronics Inc. Method and apparatus for calculating ranging information by terminal in wireless communication system supporting device to device communication

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