KR20170112737A - Method and apparatus for semi-persistent scheduling of resource for terminal in wireless communication system supporting v2x - Google Patents

Abstract

And to provide a method and apparatus for semi-permanently scheduling resources for data (packets) to be transmitted for vehicle communication by a network or a vehicle or a terminal itself in a wireless communication system.
For the semi-persistent resource scheduling, the present invention transmits configuration information for SL SPS transmission to each UE or UE type RSU through an RRC reconfiguration message, and each UE transmits configuration information for the SL SPS transmission SL transmission is performed in consideration of the effective SL subframe period K and the T-RPT.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for scheduling a semi-persistent resource in a wireless communication system supporting vehicle communication,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to wireless communication, and more particularly, to a wireless communication system supporting vehicle to everything (hereinafter referred to as " V2X & And more particularly to a method and apparatus for semi-persistently scheduling resources for data (packets) to be transmitted by each vehicle or terminal for vehicle communication.

V2X communication refers to a communication system that exchanges information such as traffic conditions while communicating with road infrastructure and other vehicles during operation. V2X is a vehicle-to-vehicle (V2V), which means LTE-based communication between vehicles, a vehicle-to-pedestrian (V2P), which means LTE-based communication between vehicles and individuals, And may include a vehicle-to-infrastructure / network (V2I / N), which refers to LTE-based communication between networks. In this case, the roadside unit (RSU) may be a transportation infrastructure entity implemented by a base station or a fixed terminal. For example, it may be an independent entity that transmits speed notifications to the vehicle. Based on the performance requirements for supporting V2X in LTE systems, we are discussing specific technologies that are required in addition to LTE systems.

Therefore, we propose a semi-persistent scheduling (SPS) method and apparatus for efficiently supporting periodic data transmission required to support a vehicle communication service.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for scheduling a semi-persistent resource in a wireless communication system.

It is another object of the present invention to provide a method and apparatus for semi-persistently scheduling resources for data (packets) to be transmitted in a wireless communication system for a vehicle communication by a network or a vehicle or a terminal itself.

Another object of the present invention is to provide a method of operating a resource in a PC interface (PC) interface (an air interface for end-to-end communication) as data generated in each vehicle or terminal occurs periodically or non-periodically.

Another object of the present invention is to provide a control method in a network or a control method between a vehicle and a terminal for constructing the resource, and a method of transmitting / receiving data according to the existence of data transmittable through allocated resources.

According to one aspect of the present invention, a method of semi-persistent resource scheduling of a terminal in a wireless communication system supporting vehicle communication is provided. Wherein the scheduling method comprises the steps of: configuring configuration information for SL SPS transmission to each UE or UE type RSU through an RRC reconfiguration message; And performing the SL transmission in consideration of the T-RPT.

According to another aspect of the present invention, the scheduling method is implemented including a process of receiving an SL SPS activation / deactivation indicator through a PDCCH or an EPDCCH.

According to another aspect of the present invention, the configuration information for the SL SPS transmission is configured such that the SPS-configSL for each destination is independently configured for each transmission destination, and the SPS- lt; RTI ID = 0.0 > configSL < / RTI >

According to another aspect of the present invention, the maximum number of configuration of the SPS-configSL is defined as the maximum number of HARQ processes capable of supporting the SL, and the value of the maximum HARQ process is implemented to include eight.

According to the present invention, a method and apparatus are provided for semi-permanently scheduling resources for data (packets) to be transmitted in a wireless communication system for vehicle communication by a network or a vehicle or a terminal itself.

Also, a method of operating a resource in an allocated PC 5 interface (an air interface for communication between terminals) is provided as data generated in each vehicle or terminal occurs periodically or non-periodically.

There is also provided a method for controlling data transmission and reception according to the control in the network or the control method between the vehicle and the terminal and the presence or absence of data transmittable through the allocated resources for constituting the resources.

In addition, by reducing control information for data transmission and reception required for vehicle communication of each vehicle or terminals, data necessary for vehicle communication can be efficiently transmitted and received.

1 shows a wireless communication system to which the present invention is applied.
Figures 2-3 illustrate different examples of V2X implementations in accordance with the present invention.
FIGS. 4-5 illustrate possible scenarios for V2X terminals within or within network coverage according to the present invention.
6 illustrates a resource allocation method for SL SPS transmission according to an embodiment of the present invention.
7 illustrates a resource allocation method for SL SPS transmission according to another embodiment of the present invention.
FIG. 8 illustrates a resource allocation method for SL SPS transmission according to another embodiment of the present invention.
Figure 9 shows an example of an LCID configuration including a 4-bit destination indicator according to the present invention.
10 shows an example of an LCID configuration including a one-bit destination indicator according to the present invention.
11 shows a resource allocation method for SL SPS transmission according to another embodiment of the present invention.
12 illustrates a resource allocation method for SL SPS transmission according to another embodiment of the present invention.
13 illustrates a resource allocation method for SL SPS transmission according to another embodiment of the present invention.
FIG. 14 is a flowchart illustrating a SL SPS transmission method of a terminal according to the present invention.
15 is a flowchart illustrating SL SPS configuration information and a control information transmission method of a base station according to the present invention.
16 is a block diagram showing a schematic structure of a base station and a terminal for SL SPS transmission according to the present invention.

Hereinafter, the contents related to the present invention will be described in detail with reference to exemplary drawings and embodiments, together with the contents of the present invention. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal included in the network.

1 shows a wireless communication system to which the present invention is applied. The network structure shown in FIG. 1 may be a network structure of an Evolved-Universal Mobile Telecommunications System (E-UMTS). The E-UMTS system may include LTE (Long Term Evolution), LTE-A (advanced) systems, and the like.

Referring to FIG. 1, a base station (BS) and a user equipment (UE) 12 in a wireless communication system 10 can transmit and receive data wirelessly. Also, the wireless communication system 10 may support device to device (D2D) communication. D2D communication in a wireless communication system will be described later.

In the wireless communication system 10, the base station 11 can provide a communication service through a specific frequency band to terminals existing within the coverage of the base station. The coverage served by the base station may also be expressed in terms of a site. A site may include a plurality of areas 15a, 15b, 15c, which may be referred to as sectors. Each of the sectors included in the site can be identified based on different identifiers. Each of the sectors 15a, 15b, and 15c can be interpreted as a partial area covered by the base station 11.

The base station 11 generally refers to a station that communicates with the terminal 12 and includes an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, a femto base station (Femto eNodeB) (ENodeB), a relay, and a remote radio head (RRH).

The terminal 12 may be fixed or mobile and may be a mobile station, a mobile terminal, a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA) , A wireless modem, a handheld device, and the like.

Also, the base station 11 may be referred to as various terms such as a megacell, a macrocell, a microcell, a picocell, a femtocell, etc., depending on the size of coverage provided by the corresponding base station. The cell may be used in terms of the frequency band provided by the base station, the coverage of the base station, or the term indicating the base station.

Hereinafter, a downlink (DL) refers to a communication or communication path from the base station 11 to the terminal 12, and an uplink (UL) refers to communication from the terminal 12 to the base station 11 Communication path ". In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11.

On the other hand, there is no limitation to the multiple access technique applied to the wireless communication system 10. For example, a CDMA (Code Division Multiple Access), a TDMA (Time Division Multiple Access), an FDMA (Frequency Division Multiple Access), an OFDMA (Orthogonal Frequency Division Multiple Access), an SC- , OFDM-TDMA, and OFDM-CDMA may be used. Also, a time division duplex (TDD) scheme or a frequency division duplex scheme (FDD) scheme using different frequencies may be used for uplink and downlink transmission.

Vehicle-to-X (V2X) refers to a communication system that exchanges information such as traffic conditions while communicating with road infrastructure and other vehicles while driving. V2X includes vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), and vehicle-to-infrastructure / network (V2I / N). V2V means LTE based communication between vehicles. V2P refers to LTE-based communication between a vehicle and mobile terminals carried by vehicles and individuals (for example, pedestrians, bicycles, drivers or passengers). V2I / N refers to LTE-based communication between the vehicle and the roadside unit / network. Here, a roadside unit (RSU) refers to a transportation infrastructure independent entity implemented by a base station or a fixed terminal. For example, it could mean an independent entity that sends a speed notification.

For the V2V operation based on PC5, which is a D2D communication link, various scenarios as below are considered.

(Form 1) The operating band width used as test points for evaluation.

Case 1A: 6 GHz

Case 1B: 2 GHz

At this time, case 1B does not need to be specifically simulated in all scenarios.

(Form 2) Placement of base station (eNB) including possibility of network control

Case 2A: semi-statically network configuration / autonomous resource allocation by at least mode 2 terminal UE based on pre-configured radio parameters

Case 2B: More UE (UE) specific and / or dynamic resource allocation provided by base stations (eNBs) including mode 1

(Form 3)

Case 3A: Terminals communicate based on PC5 using a single carrier

Case 3A: Terminals communicate based on PC5 using multi-carriers

(Mode 4)

Case 4A: Operated by a single operator

Case 4B: A set of PC5-based carriers that are shared by terminals subscribing to different operators. It means that terminals belonging to different operators can transmit signals on the same carrier wave.

Case 4C: Each operator is assigned to a different carrier. It means that the terminal can transmit signals only on the carrier assigned to the operator to which it belongs.

(Form 5) Present with Uu

Case 5A: The V2X transmission carrier is operational. Here, there is no uplink (Uu) traffic on the PC5 operating carrier wave

Figures 2-4 illustrate different examples of V2X implementations in accordance with the present invention. For the V2X implementation, only the PC5 link, which is the link between the UE and the UE defined in D2D (ProSe) as shown in Fig. 2, can be considered. 3, only the Uu link which is a link between the base station (eNodeB) and the UE (UE) may be considered. Also, as shown in FIG. 4, both the PC5 link and the Uu link may be considered including an RSU (Road Side Unit) in the form of a UE.

Hereinafter, terms used in the present invention will be defined.

D2D (Device to Device) means a communication method for performing direct data transmission / reception between two adjacent terminals without going through a base station, and may also be referred to as direct communication between terminals. That is, the two terminals perform communication while being a source and a destination of data, respectively. Since D2D is provided to provide close-to-terminal services, it can be called ProSe (Proximity based Services). The D2D communication from the transmitting D2D terminal TxD2D UE to the receiving D2D terminal RxD2D UE may be called a sidelink by distinguishing it from the existing uplink or downlink.

SCI (Sidelink Control Information) refers to control information in a side link (Sidelink).

In the sidelink, the Physical Sidelink Shared Channel (PSSCH), the Physical Side Link Control Channel (PSCCH), the Physical Side Link Discovery Channel (PSDCH), the Physical Sidelink Discovery Channel (PSDCH) The link broadcast channel is represented by a PSBCH (Physical Sidelink Broadcast Channel). In the side link, demodulation reference signal (DM-RS) can be transmitted in association with PSSCH, PSCCH, PSDCH and PSBCH transmission.

GNSS (Global Navigation Satelite System) is a system for accurately measuring the position using satellites and is called a satellite positioning system. Typically, GPS (Global Positioning System) is available.

Hereinafter, the terminal includes both the terminal devices used by general users such as smart phones and the terminal devices mounted on the vehicles.

D2D communication may mean a technique of directly transmitting and receiving data between terminals. Hereinafter, it is assumed that the terminal supports D2D communication in the embodiment of the present invention. In addition, D2D communication can be replaced with proximity based service (ProSe) or ProSe-D2D communication. The use of the term ProSe for D2D communication means that the meaning of data transmission / reception directly between terminals is not changed but the meaning of proximity based service can be added. In addition, an inter-terminal air interface and / or a wireless communication link in which the D2D communication is performed is defined as a side link (SL).

D2D communication is a discovery procedure for communication between terminals in network coverage (in-coverage) or out-of-coverage, and a direct communication (" direct communication procedures. Hereinafter, a terminal transmitting a signal based on D2D communication is referred to as a transmission terminal (Tx UE), and a terminal receiving a signal based on D2D communication is referred to as a reception terminal (Rx UE). The transmitting terminal can transmit a discovery signal, and the receiving terminal can receive a discovery signal. The roles of the transmitting terminal and the receiving terminal may be changed. A signal transmitted by a transmitting terminal may be received by more than one receiving terminal.

D2D communication can be used for various purposes. For example, D2D communications within network coverage based on commercial frequencies can be used for public safety, transportation network services, ultra-low latency services, and commercial services. However, in the case of based on the dedicated frequency of the traffic network, the D2D communication through the corresponding frequency can be used only for traffic network communication and traffic safety regardless of the network coverage.

When terminals in close proximity in a cellular system perform D2D communication, the load of the base station can be dispersed. Also, when terminals close to each other perform D2D communication, the terminals transmit data at a relatively short distance, so that the transmission power consumption and latency of the terminal can be reduced. In addition, since the existing cellular-based communication and D2D communication use the same resources from the viewpoint of the whole system, frequency utilization efficiency can be improved when they are not overlapped spatially.

D2D communication is a communication between terminals located in an in-coverage area of a network coverage (base station coverage), communication between terminals located in an out-of-coverage area, communication between terminals located within a network coverage area .

The base station may schedule the resources required for the UEs in the coverage to transmit data over the side link for D2D communication in the wireless communication system. In this case, the terminals in the coverage can inform the base station of the amount of data (D2D data) to be transmitted on the side link in the intra-terminal buffer through the buffer state report (BSR). A BSR for a site link may be referred to as a SL BSR (Sidelink BSR) or a ProSe (Proximity Service) BSR to distinguish it from a BSR for a wide area network (WAN).

In one embodiment of performing D2D communication, the base station may transmit D2D resource allocation information to a first terminal located within the coverage of the base station. The D2D resource allocation information may include allocation information for a transmission resource and / or a reception resource that can be used for D2D communication between the first terminal and another terminal. The first terminal receiving the D2D resource allocation information from the base station may transmit D2D resource allocation information to which the D2D data is to be transmitted to other terminals so as to receive the D2D data transmitted by the first terminal.

The first terminal, the second terminal, the third terminal, and / or the fourth terminal can perform D2D communication based on the D2D resource allocation information. Specifically, the second terminal, the third terminal, and / or the fourth terminal may obtain information on the D2D communication resources of the first terminal. The second terminal, the third terminal and / or the fourth terminal may receive the D2D data transmitted from the first terminal through the resources indicated by the information on the D2D communication resources of the first terminal. At this time, in order for the first terminal to allocate resources for D2D communication with the second terminal third terminal and / or the fourth terminal from the base station, information on the amount of D2D data exists in the first terminal buffer And can be transmitted to the base station via the SL BSR.

FIGS. 4 and 5 illustrate possible scenarios for V2X terminals within or within network coverage according to the present invention.

On the other hand, assume that the first terminal (V2X UE1) and the second terminal (V2X UE2) are located in the network coverage as shown in FIG. 4, so that communication with the base station is possible. That is, the first terminal and the second terminal can perform data transmission / reception for the vehicle communication service through the base station (Uu interface).

In other words, the first terminal and the second terminal can exchange data for the vehicle communication service through UL data transmission and DL data reception. However, if it is assumed that the third terminal and the fourth terminal are located outside the network coverage and that communication between the first terminal and the second terminal and the terminal is impossible, the third terminal V2X UE3 and the fourth terminal V2X UE4, Can not exchange data for the vehicle communication service with the first terminal and the second terminal. This is because the terminal can not communicate with another terminal, a base station, a server, or the like located in an area where a signal can not physically reach.

However, if the fourth terminal outside the network coverage requires connection to the network for reasons such as vehicle communication service or commercial service, and D2D communication enables D2D communication with an RSU of the UE type existing within the network service range, The RSU performs a relay function so that the fourth UE outside the network coverage can transmit data to and receive data from the base station via the indirect path. That is, as shown in the upper diagram of FIG. 3, the RSU of the UE type performs the relay function, the fourth UE transmits the vehicle communication service data to the UE type RSU through the SL, and the UE type RSU transmits UL And transmits the vehicle communication service data to the base station using transmission. The vehicle communication service data of the fourth terminal receives via the downlink of the Uu interface the terminals within the network coverage including the first terminal and the second terminal.

The UEs capable of D2D communication with the RSU of the UE type including the fourth UE and those located outside the network service range transmit the vehicle communication service data of the fourth UE to the UEs existing in the network service range through the RSU of the UE type .

As shown in FIG. 5, the vehicle communication service data transmitted from the fourth terminal V2X UE4 to the UE type RSU exists in a position where communication between the fourth terminal and the terminal is impossible, but is capable of D2D communication with the RSU of the UE type, And must be directly transmitted to terminals outside the service range. Because the V2X service is sensitive to the delay time, it is necessary to transfer data to the base station first and then reduce the delay time occurring during transmission to the UE type RSU. Therefore, the UE-type RSU should prepare not only for transferring data received from the fourth terminal to the base station via the Uu interface (LTE uplink) but also preparing to transmit data via the SL. Accordingly, when the UE type RSU operates in a mode in which the SL resource is controlled by the BS, the BS interprets the vehicle communication service data received from the fourth terminal as data to be included in the LTE side BSR, . That is, the same information must be transmitted to the PDCP / RLC layer in the SL-side RB while delivering the vehicle communication service data received from the fourth terminal to the PDCP / RLC layer in the LTE-side RB (radio bearer).

Here, the ProSe Priority Packet (PPPP) of the data transmitted to the SL-side RB maintains the priority of the received packet, and when there is no SL-side RB mapped to the priority of the received packet, The type RSU configures itself a new RB supporting the above priority and transmits the packet.

The present invention reduces the delay time caused by the resource allocation scheme based on the SL BSR when the RSU and the terminals for vehicle communication operate in mode 1, which is a mode under base station control, including the situation described in FIG. SPS method and apparatus for SL. Here, the SL SPS can be operated regardless of whether it is a main serving cell or a secondary serving cell, if the serving cell supports SL communication.

In the wireless communication system according to the present invention, the SPS method for the SL is based on a scheme in which the LTE terminal SPS the downlink or uplink data in the Uu interface as follows.

The base station can configure the information to be posted on the terminal through the RRC reconfiguration message.

For example, the base station constructs an SPS-C-RNTI value that can be confirmed as SPS resource assignment physical layer control information for uplink (UL) and downlink (DL).

In addition, when the base station configures the uplink (UL) SPS, the base station configures the UL SPS period (in units of subframes). Also, for UL, the BS configures the maximum number of consecutive empty transmissions without uplink transmission data for SPS deconfiguration. When a consecutive number of consecutive empty transmissions occur, that is, when a consecutive number of new MAC PDUs including a zero MAC SDU is generated reaches the preset maximum number, the UL SPS configuration information is released.

Also, when configuring the downlink (DL) SPS, it is configured independently of the UL SPS configuration information. To do this, the base station constructs a DL SPS period (in units of subframes). It also configures the number of HARQ processes that are SPS for downlink (DL).

In addition, the base station constructs the SPS at a predetermined subframe timing or with each other.

For example, the Nth subframe time point constituting the SPS for the uplink (UL) may be defined by Equation (1).

Where semiPersistSchedIntervalUL is the UL SPS period.

As another example, an Nth subframe time point constituting the SPS for the downlink (DL) may be configured by Equation (2).

Here, semiPersistSchedIntervalDL means DL SPS period.

In Equation (1) and Equation (2), SFN and subframe are for a time resource having an UL grant and represent a system frame number and a subframe number, respectively. Also, the SFN _{start time} and the subframe _{start time} indicate the system frame number and the subframe number at the time when the SPS is initialized or re-initialized, respectively.

Table 1 shows the RRC layer signaling for the SPS.

- SPS - Config The IE SPS - Config is used to specify the semi-persistent scheduling configuration. SPS - Config  정보 요소 - ASN1START SPS-Config :: = SEQUENCE { semiPersistSchedC-RNTI C-RNTI OPTIONAL, - Need OR SPS-ConfigDL SPS-ConfigDL OPTIONAL, - Need ON sps-ConfigUL SPS-ConfigUL OPTIONAL - Need ON } SPS-ConfigDL :: = CHOICE { release NULL, setup SEQUENCE { semiPersistSchedIntervalDL ENUMERATED { sf10, sf20, sf32, sf40, sf64, sf80, sf128, sf160, sf320, sf640, spare6, spare5, spare4, spare3, spare2, spare1}, numberOfConfSPS-Processes INTEGER (1..8), n1PUCCH-AN-PersistentList N1PUCCH-AN-PersistentList, ..., [[twoAntennaPortActivated-r10 CHOICE { release NULL, setup SEQUENCE { n1PUCCH-AN-PersistentListP1-r10 N1PUCCH-AN-PersistentList } } OPTIONAL - Need ON ]] } } SPS-ConfigUL :: = CHOICE { release NULL, setup SEQUENCE { semiPersistSchedIntervalUL ENUMERATED { sf10, sf20, sf32, sf40, sf64, sf80, sf128, sf160, sf320, sf640, spare6, spare5, spare4, spare3, spare2, spare1}, implicitReleaseAfter ENUMERATED {e2, e3, e4, e8} p0-Persistent SEQUENCE { p0-NominalPUSCH-Persistent INTEGER (-126.24), p0-UE-PUSCH-Persistent INTEGER (-8..7) } OPTIONAL, - Need OP twoIntervalsConfig ENUMERATED {true} OPTIONAL, - Cond TDD ..., [[p0-PersistentSubframeSet2-r12 CHOICE { release NULL, setup SEQUENCE { p0-NominalPUSCH-PersistentSubframeSet2-r12 INTEGER (-126.24), p0-UE-PUSCH-PersistentSubframeSet2-r12 INTEGER (-8..7) } } OPTIONAL - Need ON ]] } } N1PUCCH-AN-PersistentList :: = SEQUENCE (SIZE (1..4)) OF INTEGER (0..2047) - ASN1STOP

The parameters used in Table 1 are described in Table 2 below.

implicitReleaseAfter
Number of empty transmissions before implicit release. Value e2 corresponds to 2 transmissions, e3 corresponds to 3 transmissions and so on.

for antenna port P0 and for antenna port P1 respectively. Field n1- PUCCH -AN- PersistentListP1 is applicable only if the twoAntennaPortActivatedPUCCH-Format1a1b in PUCCH - ConfigDedicated -v1020 is set to true. Otherwise the field is not configured. n1PUCCH -AN- PersistentList, n1PUCCH -AN- PersistentListP1
List of parameter:

for antenna port P0 and for antenna port P1 respectively. Field n1- PUCCH -AN- PersistentListP1 is applicable only if the twoAntennaPortActivatedPUCCH-Format1a1b in PUCCH - ConfigDedicated -v1020 is set to true . Otherwise the field is not configured. numberOfConfSPS-Processes
The number of configured HARQ processes for Semi-Persistent Scheduling. p0-NominalPUSCH-Persistent
Parameter:

. unit dBm step 1. This field is applicable for persistent scheduling, only. If choice setup is used and p0-Persistent is absent, apply the value of p0-NominalPUSCH for p0- NominalPUSCH -Persistent. If uplink power control subframe sets are configured by tpc - SubframeSet , this field applies for uplink power control subframe set 1. p0-NominalPUSCH-PersistentSubframeSet2
Parameter:

. unit dBm step 1. This field is applicable for persistent scheduling, only. If p0- PersistentSubframeSet2 -r12 is not configured, apply the value of p0-NominalPUSCH-SubframeSet2-r12 for p0- NominalPUSCH - PersistentSubframeSet2 . E-UTRAN configures this field only if uplink power control subframe sets are configured by tpc-SubframeSet , in which case this field applies for uplink power control subframe set 2. p0-UE-PUSCH-Persistent
Parameter:

. unit dB. This field is applicable for persistent scheduling, only. If choice setup is used and p0-Persistent is absent, apply the value of p0-UE-PUSCH for p0- UE - PUSCH- Persistent. If uplink power control subframe sets are configured by tpc-SubframeSet , this field applies for uplink power control subframe set 1. p0-UE-PUSCH-PersistentSubframeSet2
Parameter:

. unit dB. This field is applicable for persistent scheduling, only. If p0- PersistentSubframeSet2 -r12 is not configured, apply the value of p0-UE-PUSCH-SubframeSet2 for p0- UE - PUSCH - PersistentSubframeSet2. E-UTRAN configures this field only if uplink power control subframe sets are configured by tpc - SubframeSet , in which case this field applies for uplink power control subframe set 2. semiPersistSchedC-RNTI
Semi-persistent Scheduling C-RNTI. semiPersistSchedIntervalDL
Semi-persistent scheduling interval in downlink. Value in number of sub-frames. Value sf10 corresponds to 10 sub-frames, sf20 corresponds to 20 sub-frames and so on. For TDD, the UE shall round this parameter down to the nearest integer (of 10 sub-frames), eg sf10 corresponds to 10 sub-frames, sf32 corresponds to 30 sub-frames, sf128 corresponds to 120 sub-frames. semiPersistSchedIntervalUL
Semi-persistent scheduling interval in uplink. Value in number of sub-frames. Value sf10 corresponds to 10 sub-frames, sf20 corresponds to 20 sub-frames and so on. For TDD, the UE shall round this parameter down to the nearest integer (of 10 sub-frames), eg sf10 corresponds to 10 sub-frames, sf32 corresponds to 30 sub-frames, sf128 corresponds to 120 sub-frames. twoIntervalsConfig
Trigger of two-intervals-Semi-Persistent Scheduling in uplink. If this field is present, two-intervals-SPS is enabled for uplink. Otherwise, two-intervals-SPS is disabled.

The inter-terminal communication can operate in one of the following two modes according to the resource control method.

Mode 1: Mode in which D2D transmission is possible only when resources for D2D communication are allocated from the base station. In order for the base station to proceed with the SL radio resource allocation, the terminal must inform or request that the base station has data to be transmitted through the current SL. The BS directly instructs resource allocation for both the SCI information to be secured for data reception and the PSSCH resource indicated by the SCI. The resource allocation is delivered to the D2D transmitting-side UE through the DCI and can be delivered via the PDCCH or EPDCCH scrambled with the SPS SL-RNTI or SL-RNTI value to indicate the physical layer control information for the side link. When the terminal is configured with SPS SL-RNTI or SL-RNTI and SL BSR related information through the RRC reconfiguration message transmitted from the base station, Mode 1 . Mode 1 can be called Scheduled mode.

Mode 2: Mode in which D2D transmission is possible regardless of the indication of the base station. The terminal may select D2D data among radio resources available in Mode 2 internally (time / frequency-mandatory, space-option). However, this is possible only when there is Mode 2 resource pool information provided from the base station through SIB / dedicated signaling. If the base station does not allow Mode 2 operation, it can not operate in Mode 2 even though Mode 2 resource pool information exists. However, when the corresponding D2D-capable UE is located in a place other than the network service area, Mode 2 resource pool information stored in an internal device such as a UICC is used or a mode 2 And can operate using the resource pool information. Mode 2 can be called autonomous resource selection mode.

Hereinafter, SPS methods for a wireless communication system SL according to the present invention are published.

Method 1) mode  1 < / RTI > (Mode 1) SL SPS  RRC messages for transmission (e.g. SPS - configSL ) And separate SPS  Operate resource allocation method

In this embodiment, the transmission through the SL SPS is limited to a broadcast form.

The base station configures configuration information for SL SPS transmission for the vehicle communication service to each terminal or UE type RSU through an RRC reconfiguration message. Each parameter of the RRC reconfiguration message is configured as follows.

One. semiPersistSchedIntervalSL

Method 1-1) semiPersistSchedIntervalSL (target transmission resource period unit defined by SL)

In Mode 1 (Mode 1), the SL valid subframes are all uplink subframes. Therefore, all subframes are subject to FDD and only uplink subframes are subject to TDD. If the value of semiPersistSchedIntervalSL is K, the position of the Nth SC period (sidelink control period) of SL SPS is determined by the following equation. When an SL grant is configured by receiving a PDCCH carrying a DCI including SL resource allocation information, the allocated T-RPT resource is always valid within an SC period. Do.

For example, assuming that the T-RPT interval is repeated 5 times within the SC period as shown in FIG. 8, the subframes defined by the same T-RPT within the interval # 5 from the T-RPT # The SL grant is valid. Therefore, since the range in which a valid SL grant is applied through a single DCI is a period of SC period, the SL SPS resource is defined in the interval of the SC SC period.

Herein, the T-RPT defines a part of the subframes set by the base station as SL communication capable of being defined as an entire T-RPT section, and defines resources in a pattern form based on the section. For example, the entire duration of the T-RPT may be eight SL-capable subframes. And includes information on the total interval value of the T-RPT, the number of resources actually allocated within the entire interval, and the location of the actual allocated resources. For example, the number of the actually allocated resources may be 1, 2, and 4, and the resource location may be defined as 8 bits in a bitmap scheme, with '0' unallocated and '1' allocated.

6 illustrates a resource allocation method for SL SPS transmission according to an embodiment of the present invention.

Referring to FIG. 6, the SC period number indicates the start of the SC period, that is, the SC period number 0 is an SC period (period) based on the subframe number 0 in the system frame number (SFN) The SC period starting after the offset value defining the starting point becomes 0 (610). Thereafter, the SC period increases by 1 and becomes 0 again after the maximum value (620) of the SC period number. The SFN may be 0 to 1023 and the subframe number may be 0 to 9. At this time, a valid SC period is expressed by the following equation (3).

The SC_period _{start time} in Equation (3) represents the number 710 of the earliest valid SC period at the time of initializing the SL SPS (the time at which the SL grant is configured). That is, it is the minimum SC period valid at the time the SL grant is configured. Also, M is the maximum value of the SC period number counted for the SL SPS.

Referring to FIG. 7, the SC cycle # 1 710 and the SC cycle # 4 are allocated to the interval of K SC cycles, which is the Nth valid SC period, that is, the SL cycle in which the SL grant is configured. Lt; RTI ID = 0.0 > 720 < / RTI > The maximum value of the SC period number may be, for example, 10240 / (SC period length). If the length of the SC period is 40ms, then M may be 256.

Method 1-2) semiPersistSchedIntervalSL (SL SPS period value to target SL valid subframes in single transmission resource pool defined in SL)

In Mode 1 (Mode 1), the SL valid subframes are all uplink subframes. Therefore, all subframes are subject to FDD and only uplink subframes are subject to TDD. If the value of semiPersistSchedIntervalSL is K, the Nth time resource position of the SL SPS is determined by Equation (4) below. Thus indicating the location of the T-RPT (in which the actual SL transmission is performed) to which the SL grant is applied within all SC periods.

start time는 SL SPS를 초기화한 이후 가장 빠른 유효한 SC 주기 내에 최초 T-RPT의 최초 서브프레임의 위치를 나타낸다. In Equation (4), N represents the number of subframes in the resource pool for SL,

The start time indicates the position of the first sub-frame of the first T-RPT within the earliest valid SC period since initializing the SL SPS.

For example, referring to FIG. 8, an effective time resource 810 in a T-RPT starting from the subframe is configured as an SL grant. The available time resources may be indicated by the base station in the T-RPT interval 830 in some subframes.

는 SL SPS된 시간축에서의 서브프레임의 위치를 나타낸다. 상기

는 주기적으로 반복되는 매 자원 풀(resource pool) 구간에서 정의된다. 또한, j의 범위는 0 내지 -1 이다. 상기

를 기준으로 단일 T-RPT 동안에 SL 전송이 허용되고, 이후 유효한 SL 서브프레임 K 주기(820)로 단일 T-RPT 동안(810, 840)에 SL 전송이 허용된다.For example, it is valid for four subframes within the T-RPT interval constituted by eight subframes. By using 8 bits in bitmap form, '0' is not valid and '1' is valid . Also,

Indicates the position of the subframe in the time axis on which the SL SPS is performed. remind

Is defined in every resource pool period that is repeated periodically. The range of j is 0 to -1. remind

, SL transmission is allowed during a single T-RPT (810, 840) with a valid SL subframe K period 820. [

2. implicitReleaseAfterSL (indicates the maximum number of consecutive empty transmissions without SL transmission data for SPS unconfiguration)

When a free transmission is continuously generated for the maximum number of times configured by the base station, that is, when the MAC layer provides the information bit length transmittable in the physical layer, the MAC layer transmits new MAC PDU Are generated consecutively the maximum number of times, the SL grant configured by the SL SPS is released. Where the beacon transmission is not actually transmitted over the PSSCH. That is, if MAC PDUs constitute new data including zero MAC SDUs in the MAC layer, the MAC PDUs are not transmitted to the physical layer.

3. SPS SL-RNTI (separate RNTI for SPS)

And uses the SPS-SL-RNTI to identify the SL SPS resource control information allocated by the base station. The SPS-SL-RNTI value is selected among the values within the defined range as shown in Table 3 below, and the BS randomly selects the SPS-SL-RNTI value for each UE.

Value ( hexa -decimal) RNTI 0000 N / A 0001-003C RNTI, Semi-Persistent Scheduling C-RNTI, Semi-Persistent Scheduling SL-RNTI, Temporary C-RNTI, eIMTA-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI and SL- note), G-RNTI 003D-FFF3 RNTI, Semi-Persistent Scheduling C-RNTI, Semi-Persistent Scheduling SL-RNTI, eIMTA-RNTI, Temporary C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI and SL- FFF4-FFF9 Reserved for future use FFFA SC-N-RNTI FFFB SC-RNTI FFFC CC-RNTI FFFD M-RNTI FFFE P-RNTI FFFF SI-RNTI

Based on the RRC configuration information, an SL grant is configured through the following procedure. If the SLS SPS activation / deactivation indicator in the received PDCCH or EPDCCH indicates activation, the terminal stores grant information for the SL provided on the PDCCH and determines that the SL grant is configured. The DCI included in the PDCCH includes DCI (downlink control information) for SL newly introduced for vehicle communication, and includes an activation / deactivation indicator of the SL SPS. When the indicator is '1', it indicates activation, and when it is '0', it indicates that it is inactive (SL grant release). This field is valid only when the PDCCH or EPDCCH including the DCI for the SL is CRC scrambled with the SPS SL-RNTI.

The activation / deactivation indication information of the SL SPS may be transmitted through the MAC CE. The MAC CE information includes a MAC subheader included in a MAC header and an 8-bit message included in a MAC payload. It can be confirmed that the corresponding MAC CE is an SL SPS activation / deactivation indicator through LCID (logical channel ID) information included in the MAC subheader. The LCID value may be, for example, " 10111 ". The 8-bit message indicates activation / deactivation. For example, activation may be defined as '11111111', and deactivation may be defined as '00000000'. SL SPS activation / deactivation indication information does not exist separately, and it is activated from the time when the UE applies the configuration information for the SL SPS through the RRC reconfiguration message, so that the SL grant can be configured and stored in the UE. In addition, after the RRC reconfiguration message including the information for canceling the SL SPS configuration is received, the SL SPS is released from the time when the terminal is applied, so that the SL grant can be deconstructed.

Method 2) mode  1 < / RTI > (Mode 1) SL SPS  RRC configuration information for transmission (e.g. SPS - configSL ), Respectively by destination  And each destination has its own separate SPS  Operate resource allocation method

In the case of inter-terminal communication or vehicle communication, since there may be a plurality of transmission sources, data to be received may greatly increase. Therefore, in order to reduce the reception complexity, it is necessary to limit the information transmitted from the single transmission source among the data to be received by the corresponding UE during the SC period. Therefore, it is necessary to restrict only one SL grant to be valid for the same target within a single SC period, but multiple SL grants are valid for different targets. That is, the UE can simultaneously transmit a plurality of PSSCHs to the UE within a single SC period. Therefore, a similar principle can be applied to SL SPS. In this embodiment, a method of configuring the SPS-configSL for a plurality of destinations is independently configured for each transmission object, and the SPS-configSLs configured as described above may be configured in a list format. At this time, the maximum number of the SPS-configSLs is limited to the maximum number of HARQ processes that can support the SL. The value of the maximum HARQ process may be eight.

1. Destination ID (destination information of data to be transmitted through SL SPS)

The Destination ID indicates a value for indicating to which object the SL SPS resource control information allocated by the base station is for. If there is no setting value for the Destination ID, it defaults to the broadcasting value. The destination ID is divided into an ID defined for a groupcast purpose and an ID defined for a unicast purpose, and the range of the destination ID is defined to be the same. Or to have different ranges.

On the other hand, the destination ID value may be provided as 24 bits of L2 ID.

The destination ID value may be provided in 4 bits, which is a destination index value defined based on the L2 destination ID defined for the groupcast or unicast purpose. The destination index value is defined in ascending order based on the order in the L2 destination ID list information defined for the groupcast or unicast use that the terminal provides to the base station.

In the meantime, the destination ID is defined as '0', which is defined on the basis of the L2 destination ID defined for the groupcast / unicast purpose, and a destination having a destination index value of 0 is set as '1' Lt; RTI ID = 0.0 > 1 < / RTI > Here, the L2 destination ID corresponding to the destination index value '0' is known based on the L2 destination ID information provided by the terminal in advance to the base station.

Meanwhile, the Destination ID may be included in the DCI for SL newly introduced for the vehicle communication to indicate to which SL SPS the object to be activated / deactivated by the DCI is. That is, the base station can transmit the DCI through the PDCCH or the EPDCCH and configure the resources for the desired destination in the SPS format.

In this embodiment, the LCID configuration among the SL SPS activation / deactivation methods via the MAC is the same as that of the method 1.

The 8-bit message may be composed of a 4-bit or 1-bit indicator D indicating a destination and a 1-bit indicator A indicating activation / deactivation. And the remaining bits are constituted by spare bits (R).

FIG. 9 shows an example in which the 8-bit message includes a 4-bit indicator (D) indicating a destination, FIG. 10 shows an example in which the 8-bit message includes a 1-bit indicator (D) . In the configurations shown in Figs. 9 and 10, the indicator A indicating activation / deactivation is all 1 bit.

Meanwhile, in the present embodiment, the method of activating / deactivating the SL SPS through the downlink control information (DCI) for SL newly introduced for vehicle communication is the same as that of the method 1 in the DCI included in the PDCCH or the EPDCCH. That is, the method of activating / deactivating the SL SPS over the PDCCH is determined according to the information about each destination in the DCI transmitted through the PDCCH.

In the meantime, semiPersistSchedIntervalSL / implicitReleaseAfterSL / SPS SL-RNTI, which is a detailed parameter in this embodiment, is configured in the same manner as the embodiment of Method 1.

In this embodiment, the SL SPS activation / deactivation indicator information is configured in the same manner as the embodiment of method 1, such as the PDCCH or MAC CE or RRC configuration information application time point.

Method 3) mode  1 < / RTI > (Mode 1) To the terminal  Sent SL  For transmission SPS  Related control information PDCCH  or EPDCCH  When receiving through SL - RNTI  Receive using

In this embodiment, since the vehicle communication service is a service requiring periodic data transmission, it includes a case where the base station operates separate transmission and reception resource pool information for the vehicle communication service.

In this embodiment, the base station configures the SL configuration information for the vehicle communication service as follows and transmits it to each terminal or UE type RSU through an RRC reconfiguration message.

1. implicitReleaseAfterSL (the maximum number of consecutive empty transmissions without SL transmission data for SPS unconfiguration)

If empty transmissions occur consecutively for the maximum number of times configured by the BS, that is, when MAC PDUs, which are new data including a zero MAC SDU, are generated, the SL grant configured by the SL SPS is released. Where the beacon transmission is not actually transmitted over the PSSCH. That is, if the MAC layer is configured with MAC PDU, which is new data including a zero MAC SDU, the MAC PDU is not transmitted to the physical layer. The implicitDeactivationAfterSL value may be one of {e0, e1, e2, e4, e8}, where e0 is the number of times that the SPS is configured and the SPS is activated by an activation indicator in the DCI, Implies that the SPS is implicitly released immediately after transmission. That is, although the base station has configured the SL SPS, one-time resource allocation is possible.

2. SPS SL-RNTI

In this embodiment, DCI information for SL SPS resource allocation is provided using an SL-RNTI without constructing a separate RNTI for the SPS. For this purpose, a new D2D communication mode for supporting V2X through RRC signaling can be defined and transmitted to each terminal through RRC reconfiguration message. Meanwhile, the V2X communication mode configuration can be provided only when the base station receives a resource request for V2X communication from the terminal. The resource request for the V2X communication uses the sidelink UE information procedure used for the discovery resource request for public safety.

3. semiPersistSchedIntervalSL, Destination ID

The detailed parameters semiPersistSchedIntervalSL are configured in the same manner as the embodiment according to the method 1, and the Destination ID is constructed in the same manner as the embodiment according to the method 2.

Meanwhile, the SL SPS activation / deactivation indicator information is constructed in the same manner as the embodiment according to the method 1, such as the PDCCH or MAC CE or RRC configuration information application time point.

Method 4) mode  1 < / RTI > (Mode 1) SL SPS  Configure SPS-config for transmission and use separate SPS  Operate resource allocation method

In this embodiment, the transmission through the SL SPS is limited to a broadcast form. 11 shows a resource allocation method for SL SPS transmission according to the present invention.

The semiPersistSchedIntervalSL parameter always has a value of 1. Therefore, the semiPersistSchedIntervalSL parameter is not included in the RRC configuration information.

The base station configures the configuration information for SL SPS transmission for the vehicle communication service to each terminal or UE type RSU through an RRC reconfiguration message as follows.

Method 4-1) implicitReleaseAfterSL (maximum number of consecutive empty transmission SC periods without SL transmission data for SPS unconfiguration)

12 shows a resource allocation method for SL SPS transmission according to the present method.

If empty transmissions occur in consecutive periods as many as the maximum number of times configured by the BS in all subframes within the SC period, i.e., new data including zero MAC SDUs during the period The SL grant configured by the SL SPS is released 1240 if the SC period 1230 filled only by the MAC PDUs 1210 is continuously generated by the number of times 1220 defined in the implicitReleaseAfterSL. . Where the beacon transmission is not actually transmitted over the PSSCH. That is, if MAC PDUs constitute new data including zero MAC SDUs in the MAC layer, the MAC PDUs are not transmitted to the physical layer.

Method 4-2) implicitReleaseAfterSL (maximum number of consecutively missing real MAC PDU transmissions without SL transmission data for SPS unconfiguration)

13 shows a resource allocation method for SL SPS transmission according to the present method.

When empty transmission occurs consecutively for the maximum number of times configured by the base station, that is, when MAC PDUs which are new data including a zero MAC SDU are generated, the SL grant configured by the SL SPS is released. Where the beacon transmission is not actually transmitted over the PSSCH. That is, if MAC PDUs constitute new data including zero MAC SDUs in the MAC layer, the MAC PDUs are not transmitted to the physical layer. When the MAC layer generates the MAC PDU, the MAC layer constructs the actual MAC PDU based on the length of the transmittable information bits provided by the physical layer. The transmittable information bit length is calculated in consideration of the sub-frames in at least one valid T-RPT in the physical layer.

For example, if there are four transmission opportunities, the length of information bits capable of transmitting one MAC PDU can be calculated. If there are two transmission opportunities in one T-RPT pattern, A time resource 1310 during two T-RPT patterns is needed. If the implicitReleaseAfterSL value is set to 2 (1320), two T-RPT pattern intervals are counted (1330) once. Therefore, when MAC PDUs are generated 1330 and 1340, which are new data including two MAC PDUs consecutively zero MAC SDUs in four T-RPT pattern periods continuously, the SL SPS is released. That is, the SL grant configured by the SL SPS is released (1350).

The detailed configuration of the SPS-SL-RNTI is the same as the method 1, and the configuration of the Destination ID is the same as that of the method 2.

The SL SPS enable / disable indicator information is the same as Method 1, such as when PDCCH or MAC CE or RRC configuration information is applied.

FIG. 14 is a flowchart of a terminal operation based on the contents of the present invention.

The UE determines whether the SL SPS related configuration information is present in the RRC reconfiguration message received from the base station (1400). If the SL SPS related configuration information exists, the SL SPS operation is prepared according to the configuration information.

Then, when receiving the L1 control information such as the DCI including the SL SPS activation information from the base station (1405), the SL grant is configured based on the previously received RRC configuration information and the L1 control information.

Thereafter, the terminal proceeds with SL data transmission based on the configured SL grant (1410).

If the terminal receives the L1 control information including the SL SPS deactivation information from the base station or the condition that the terminal should release the SL grant itself based on the RRC configuration information (1415), the SL SPS is deactivated (1420). Otherwise, when the SL SPS configuration information release information is received from the base station through the RRC reconfiguration message, the SL SPS configuration is canceled (1420).

Thereafter, the terminal suspends SL transmission based on the SL SPS (1420).

That is, according to the present embodiment, the SL SPS transmission method of the UE includes checking whether the SL SPS related configuration information is present in the RRC reconfiguration message received from the base station, receiving the L1 control information such as the DCI including the SL SPS activation information from the base station Configuring an SL grant based on the received RRC configuration information and the L1 control information, transmitting SL data based on the configured SL grant, and transmitting the SL SPS deactivation information from the base station (SL grant release) of the SL SPS, receiving the included L1 control information, confirming whether or not the condition of releasing the SL grant itself on the basis of the RRC configuration information is satisfied, and deactivating have.

Figure 15 shows a flow diagram of a base station operation based on the teachings of the present invention.

If the terminal determines (1500) that periodic SL data transmission such as a vehicle communication service is necessary in consideration of SL BSR information received from the terminal, the base station includes SL SPS related configuration information in the RRC reconfiguration message, (1505). If it is determined that there is data required to transmit the periodic SL data according to the SL BSR information received from the terminal, the terminal transmits SL control information such as DCI including the SL SPS activation information to the corresponding terminal (step 1510) . ≪ / RTI >

Thereafter, when the BS determines that the UE no longer requires periodic SL data transmission such as a vehicle communication service (1515), for example, it may recognize that the application for the service is terminated, or that the bearer configuration for the service If it is released, it transmits 1520 the same L1 control information as the DCI including the SL SPS deactivation information or transmits the SL SPS configuration information release information through the RRC reconfiguration message (1520).

16 is a block diagram showing a schematic structure of a base station and a terminal for SL SPS transmission according to the present invention.

16, a terminal 1600 includes an RF unit (radio frequency unit) 1610, a processor 1650, and a memory 1630.

RF section 1610 is coupled to processor 1650 to transmit and / or receive wireless signals. For example, RF section 1610 may receive configuration information regarding the SL SPS from base station 1700 and provide it to memory 1630 or processor 1650. The configuration information on the SL SPS may be information on the configuration according to the method 1 to the method 4 with reference to FIG. 6 to FIG. Or the RF unit 1610 may transmit the SL BSR information to the base station 1700. To this end, the RF unit 1610 may include a baseband circuit for processing a radio signal. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The module is stored in memory and can be executed by the processor. The memory may be internal or external to the processor and may be coupled to the processor by any of a variety of well known means.

The memory 1630 is coupled to the processor 1650 to store various information for driving the processor 1650. For example, the memory 1630 may store the SL SPS received from the RF unit 1610 and provide it to the processor 1650. Memory 1630 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.

Processor 1650 may include an application-specific integrated circuit (ASIC), other chipset, logic circuitry and / or data processing device and may implement the proposed functionality, procedures and / or methods. For example, the processor 1650 determines whether there is SL-SPS-related configuration information in the RRC reconfiguration message, and constructs and transmits the SL SPS data according to the configuration information.

As an example, the processor 1650 may include an acknowledgment unit 1653 and a data generation unit 1655.

The confirmation unit 1653 confirms whether the SL SPS related configuration information is present in the RRC reconfiguration message received from the base station.

The data generation unit 1655 constructs an SL grant based on the SL SPS related configuration information confirmed by the confirmation unit 1653 and generates SL data based on the configured SL grant. The SL data may be configured based on Method 1 to Method 4 and FIGS. 6 to 13.

The base station 1700 includes a radio frequency (RF) unit 1710, a processor 1720, and a memory 1730. The memory 1730 is coupled to the processor 1720 and stores various information for driving the processor 1720. The RF section 1710 is coupled to the processor 1720 to transmit and / or receive wireless signals. For example, RF section 1710 may receive SL BSR information from terminal 1600 and provide it to memory 1730 or processor 1750. Alternatively, the RF unit 1710 transmits configuration information regarding the SL SPS to the terminal. The configuration information on the SL SPS may be information on the configuration according to the method 1 to the method 4 with reference to FIG. 6 to FIG.

The memory 1730 is coupled to the processor 1750 and stores various information for driving the processor 1750. For example, memory 1730 may store SL BSR information received from RF section 1710 and provide it to processor 1750. Memory 1630 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.

Processor 1720 implements the functions, processes, and / or methods suggested herein. The operation of base station 1700 in the above described embodiments may be implemented by processor 1720. [ The processor 1720 generates the uplink resource allocation information, the side link resource allocation information, the relay configuration information, and the like, which are published herein, and schedules the SL SPS resources based on the SL BSR received from the terminal 1600.

In one example, the processor 1750 may include a determination unit 1751 and a configuration unit 1755.

The determination unit 1751 can determine whether SL data communication of the corresponding terminal is possible based on the SL BSR information or the like received from the terminal.

The configuration unit 1755 may configure the SL SPS configuration information when the determination unit 1751 determines that the terminal that has transmitted the terminal information and / or the capability information of the terminal needs to transmit the SL data. For example, the SL SPS configuration information may include parameters necessary for the corresponding terminal to operate as an SL SPS terminal. Upon receiving the SL SPS configuration information, the corresponding terminal may recognize that the base station implicitly instructs the base station to operate as the SL SPS terminal. Alternatively, the SL SPS configuration information may include information directly indicating that the corresponding terminal operates as an SL SPS terminal, in addition to the parameters. In addition, the configuration unit 1755 may configure information on whether or not the relay terminal operation is permitted to the corresponding terminal. In this case, the terminal receiving the information on whether the relay terminal is allowed to operate can determine whether to operate the relay terminal on its own basis.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

Claims (4)

A semi-persistent resource scheduling method of a terminal in a wireless communication system supporting vehicle communication,
Configuring and transmitting configuration information for SL SPS transmission to each UE or UE type RSU through an RRC reconfiguration message,
And performing SL transmission considering the valid SL subframe period K and T-RPT using the received configuration information for SL SPS transmission.
The method of claim 1, further comprising the step of receiving an SL SPS activation / deactivation indicator through a PDCCH or an EPDCCH.
2. The method of claim 1, wherein the configuration information for the SL SPS transmission comprises:
Wherein the SPS-configSL is configured for each destination and each SPS-configSL is independently configured for each transmission object, and the SPS-configSLs configured in the form of one list are configured.
2. The method of claim 1, wherein the maximum number of SPS-config SLs is defined as a maximum number of HARQ processes capable of supporting SL, and the value of the maximum HARQ process is 8.

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