WO2019156507A1 - Procédé et appareil de notification de duplication de paquets - Google Patents

Procédé et appareil de notification de duplication de paquets Download PDF

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Publication number
WO2019156507A1
WO2019156507A1 PCT/KR2019/001579 KR2019001579W WO2019156507A1 WO 2019156507 A1 WO2019156507 A1 WO 2019156507A1 KR 2019001579 W KR2019001579 W KR 2019001579W WO 2019156507 A1 WO2019156507 A1 WO 2019156507A1
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WIPO (PCT)
Prior art keywords
frequency
information
destination
packet duplication
sidelink
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PCT/KR2019/001579
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English (en)
Inventor
Jaewook Lee
Taehun Kim
Jongwoo HONG
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Lg Electronics Inc.
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Publication date
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Publication of WO2019156507A1 publication Critical patent/WO2019156507A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/082—Load balancing or load distribution among bearers or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/0875—Load balancing or load distribution to or through Device to Device [D2D] links, e.g. direct-mode links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for informing that multiple frequencies are related for packet duplication in a wireless communication system and an apparatus supporting the same.
  • a 5G communication system or pre-5G communication system is referred to as a beyond-4G-network communication system or post-long-term evolution (LTE) system.
  • D2D communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly without an evolved Node B (eNB).
  • UEs User Equipments
  • eNB evolved Node B
  • D2D communication may cover UE-to-UE communication and peer-to-peer communication.
  • D2D communication may be applied to Machine-to-Machine (M2M) communication and Machine Type Communication (MTC).
  • M2M Machine-to-Machine
  • MTC Machine Type Communication
  • D2D communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic. For example, since devices exchange data directly with each other without an eNB by D2D communication, compared to legacy wireless communication, network overhead may be reduced. Further, it is expected that the introduction of D2D communication will reduce procedures of an eNB, reduce the power consumption of devices participating in D2D communication, increase data transmission rates, increase the accommodation capability of a network, distribute load, and extend cell coverage.
  • the UE interested in the packet duplication for a sidelink transmission can transmit sidelink UE information to the BS.
  • the sidelink UE information may include information on frequency 1, a destination 1 related to the frequency 1, information on frequency 2, and a destination 1 related to the frequency 2.
  • a destination index of the destination 1 related to the frequency 1 and a destination index of the destination 1 related to the frequency 2 may be different.
  • the destination index of the destination 1 related to the frequency 1 may be a zero, but the destination index of the destination 1 related to the frequency 2 may be a two.
  • the BS cannot know whether or not the frequency 2 is a frequency for the packet duplication in the sidelink transmission.
  • One embodiment provides a method for informing that multiple frequencies are related for packet duplication by a user equipment (UE) in a wireless communication system.
  • the method may include: determining whether or not to perform the packet duplication; when it is determined to perform the packet duplication, transmitting first information on a first frequency and second information on a second frequency for the packet duplication; and transmitting third information informing that the first frequency and the second frequency are related for the packet duplication.
  • the UE may include: a transceiver; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: determining whether or not to perform the packet duplication; when it is determined to perform the packet duplication, transmitting first information on a first frequency and second information on a second frequency for the packet duplication; and transmitting third information informing that the first frequency and the second frequency are related for the packet duplication.
  • Another embodiment provides a method for packet duplication by a base station (BS) in a wireless communication system.
  • the method may include: receiving a sidelink UE information including first information on a first frequency and second information on a second frequency for a packet duplication, from a user equipment (UE); and receiving sidelink buffer state report (BSR) including third information informing that the first frequency and the second frequency are related for the packet duplication, from the UE.
  • BSR sidelink buffer state report
  • a base station can know whether or not multiple frequencies are related for packet duplication.
  • FIG. 1 shows an example of a wireless communication system to which technical features of the present invention may be applied.
  • FIG. 2 shows another example of a wireless communication system to which technical features of the present invention may be applied.
  • FIG. 3 shows a block diagram of a user plane protocol stack to which technical features of the present invention may be applied.
  • FIG. 4 shows a block diagram of a control plane protocol stack to which technical features of the present invention may be applied.
  • FIG. 5 shows types of V2X applications to which technical features of the present invention may be applied.
  • FIG. 6 shows sidelink BSR MAC Control Elements to which technical features of the present invention may be applied.
  • FIG. 7 shows a procedure for explaining a problem that may occur when packet duplication is applied for the sidelink transmission.
  • FIG. 8 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 9 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 10 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 11 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 12 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 13 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 14 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 15 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 16 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 17 shows examples of MAC subheader and MAC PDU consisting of MAC header, MAC control elements, MAC SDUs and padding according to an embodiment of the present invention.
  • FIG. 18 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • FIG. 19 shows a method for informing that multiple frequencies are related for packet duplication by a UE according to an embodiment of the present invention.
  • FIG. 20 shows a UE to implement an embodiment of the present invention.
  • FIG. 21 shows a method for packet duplication by a BS according to an embodiment of the present invention.
  • FIG. 22 shows a BS to implement an embodiment of the present invention.
  • the term “/” and ?,” should be interpreted to indicate “and/or.”
  • the expression “A/B” may mean “A and/or B.”
  • A, B may mean “A and/or B.”
  • A/B/C may mean “at least one of A, B, and/or C.”
  • A, B, C may mean “at least one of A, B, and/or C.”
  • the term “or” should be interpreted to indicate “and/or.”
  • the expression “A or B” may comprise 1) only A, 2) only B, and/or 3) both A and B.
  • the term “or” in this document should be interpreted to indicate "additionally or alternatively.”
  • the technical features described below may be used by a communication standard by the 3rd generation partnership project (3GPP) standardization organization, a communication standard by the institute of electrical and electronics engineers (IEEE), etc.
  • the communication standards by the 3GPP standardization organization include long-term evolution (LTE) and/or evolution of LTE systems.
  • LTE long-term evolution
  • LTE-A LTE-advanced
  • LTE-A Pro LTE-A Pro
  • NR 5G new radio
  • the communication standard by the IEEE standardization organization includes a wireless local area network (WLAN) system such as IEEE 802.11a/b/g/n/ac/ax.
  • WLAN wireless local area network
  • the above system uses various multiple access technologies such as orthogonal frequency division multiple access (OFDMA) and/or single carrier frequency division multiple access (SC-FDMA) for downlink (DL) and/or uplink (DL).
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA and SC-FDMA may be used for DL and/or UL.
  • FIG. 1 shows an example of a wireless communication system to which technical features of the present invention may be applied.
  • FIG. 1 shows a system architecture based on an evolved-UMTS terrestrial radio access network (E-UTRAN).
  • E-UTRAN evolved-UMTS terrestrial radio access network
  • the aforementioned LTE is a part of an evolved-UTMS (e-UMTS) using the E-UTRAN.
  • e-UMTS evolved-UTMS
  • the wireless communication system includes one or more user equipment (UE; 10), an E-UTRAN and an evolved packet core (EPC).
  • the UE 10 refers to a communication equipment carried by a user.
  • the UE 10 may be fixed or mobile.
  • the UE 10 may be referred to as another terminology, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, etc.
  • the E-UTRAN consists of one or more base station (BS) 20.
  • the BS 20 provides the E-UTRA user plane and control plane protocol terminations towards the UE 10.
  • the BS 20 is generally a fixed station that communicates with the UE 10.
  • the BS 20 hosts the functions, such as inter-cell radio resource management (MME), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration/provision, dynamic resource allocation (scheduler), etc.
  • MME inter-cell radio resource management
  • RB radio bearer
  • connection mobility control such as connection mobility control, radio admission control, measurement configuration/provision, dynamic resource allocation (scheduler), etc.
  • the BS may be referred to as another terminology, such as an evolved NodeB (eNB), a base transceiver system (BTS), an access point (AP), etc.
  • eNB evolved NodeB
  • BTS base transceiver system
  • AP access point
  • a downlink (DL) denotes communication from the BS 20 to the UE 10.
  • An uplink (UL) denotes communication from the UE 10 to the BS 20.
  • a sidelink (SL) denotes communication between the UEs 10.
  • a transmitter may be a part of the BS 20, and a receiver may be a part of the UE 10.
  • the transmitter may be a part of the UE 10
  • the receiver may be a part of the BS 20.
  • the transmitter and receiver may be a part of the UE 10.
  • the EPC includes a mobility management entity (MME), a serving gateway (S-GW) and a packet data network (PDN) gateway (P-GW).
  • MME hosts the functions, such as non-access stratum (NAS) security, idle state mobility handling, evolved packet system (EPS) bearer control, etc.
  • NAS non-access stratum
  • EPS evolved packet system
  • the S-GW hosts the functions, such as mobility anchoring, etc.
  • the S-GW is a gateway having an E-UTRAN as an endpoint.
  • MME/S-GW 30 will be referred to herein simply as a "gateway," but it is understood that this entity includes both the MME and S-GW.
  • the P-GW hosts the functions, such as UE Internet protocol (IP) address allocation, packet filtering, etc.
  • IP Internet protocol
  • the P-GW is a gateway having a PDN as an endpoint.
  • the P-GW is connected to an external network.
  • the UE 10 is connected to the BS 20 by means of the Uu interface.
  • the UEs 10 are interconnected with each other by means of the PC5 interface.
  • the BSs 20 are interconnected with each other by means of the X2 interface.
  • the BSs 20 are also connected by means of the S1 interface to the EPC, more specifically to the MME by means of the S1-MME interface and to the S-GW by means of the S1-U interface.
  • the S1 interface supports a many-to-many relation between MMEs / S-GWs and BSs.
  • FIG. 2 shows another example of a wireless communication system to which technical features of the present invention may be applied.
  • FIG. 2 shows a system architecture based on a 5G new radio access technology (NR) system.
  • the entity used in the 5G NR system (hereinafter, simply referred to as "NR") may absorb some or all of the functions of the entities introduced in FIG. 1 (e.g. eNB, MME, S-GW).
  • the entity used in the NR system may be identified by the name "NG" for distinction from the LTE/LTE-A.
  • the wireless communication system includes one or more UE 11, a next-generation RAN (NG-RAN) and a 5th generation core network (5GC).
  • the NG-RAN consists of at least one NG-RAN node.
  • the NG-RAN node is an entity corresponding to the BS 10 shown in FIG. 1.
  • the NG-RAN node consists of at least one gNB 21 and/or at least one ng-eNB 22.
  • the gNB 21 provides NR user plane and control plane protocol terminations towards the UE 11.
  • the ng-eNB 22 provides E-UTRA user plane and control plane protocol terminations towards the UE 11.
  • the 5GC includes an access and mobility management function (AMF), a user plane function (UPF) and a session management function (SMF).
  • AMF hosts the functions, such as NAS security, idle state mobility handling, etc.
  • the AMF is an entity including the functions of the conventional MME.
  • the UPF hosts the functions, such as mobility anchoring, protocol data unit (PDU) handling.
  • PDU protocol data unit
  • the UPF an entity including the functions of the conventional S-GW.
  • the SMF hosts the functions, such as UE IP address allocation, PDU session control.
  • the gNBs and ng-eNBs are interconnected with each other by means of the Xn interface.
  • the gNBs and ng-eNBs are also connected by means of the NG interfaces to the 5GC, more specifically to the AMF by means of the NG-C interface and to the UPF by means of the NG-U interface.
  • layers of a radio interface protocol between the UE and the network may be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system.
  • OSI open system interconnection
  • FIG. 3 shows a block diagram of a user plane protocol stack to which technical features of the present invention may be applied.
  • FIG. 4 shows a block diagram of a control plane protocol stack to which technical features of the present invention may be applied.
  • the user/control plane protocol stacks shown in FIG. 3 and FIG. 4 are used in NR. However, user/control plane protocol stacks shown in FIG. 3 and FIG .4 may be used in LTE/LTE-A without loss of generality, by replacing gNB/AMF with eNB/MME.
  • the PHY layer offers information transfer services to media access control (MAC) sublayer and higher layers.
  • the PHY layer offers to the MAC sublayer transport channels. Data between the MAC sublayer and the PHY layer is transferred via the transport channels.
  • MAC media access control
  • the MAC sublayer belongs to L2.
  • the main services and functions of the MAC sublayer include mapping between logical channels and transport channels, multiplexing/de-multiplexing of MAC service data units (SDUs) belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels, scheduling information reporting, error correction through hybrid automatic repeat request (HARQ), priority handling between UEs by means of dynamic scheduling, priority handling between logical channels of one UE by means of logical channel prioritization (LCP), etc.
  • the MAC sublayer offers to the radio link control (RLC) sublayer logical channels.
  • RLC radio link control
  • the RLC sublayer belong to L2.
  • the RLC sublayer supports three transmission modes, i.e. transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM), in order to guarantee various quality of services (QoS) required by radio bearers.
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • the main services and functions of the RLC sublayer depend on the transmission mode.
  • the RLC sublayer provides transfer of upper layer PDUs for all three modes, but provides error correction through ARQ for AM only.
  • LTE/LTE-A the RLC sublayer provides concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer) and re-segmentation of RLC data PDUs (only for AM data transfer).
  • the RLC sublayer provides segmentation (only for AM and UM) and re-segmentation (only for AM) of RLC SDUs and reassembly of SDU (only for AM and UM). That is, the NR does not support concatenation of RLC SDUs.
  • the RLC sublayer offers to the packet data convergence protocol (PDCP) sublayer RLC channels.
  • PDCP packet data convergence protocol
  • the PDCP sublayer belong to L2.
  • the main services and functions of the PDCP sublayer for the user plane include header compression and decompression, transfer of user data, duplicate detection, PDCP PDU routing, retransmission of PDCP SDUs, ciphering and deciphering, etc.
  • the main services and functions of the PDCP sublayer for the control plane include ciphering and integrity protection, transfer of control plane data, etc.
  • the service data adaptation protocol (SDAP) sublayer belong to L2.
  • the SDAP sublayer is only defined in the user plane.
  • the SDAP sublayer is only defined for NR.
  • the main services and functions of SDAP include, mapping between a QoS flow and a data radio bearer (DRB), and marking QoS flow ID (QFI) in both DL and UL packets.
  • the SDAP sublayer offers to 5GC QoS flows.
  • a radio resource control (RRC) layer belongs to L3.
  • the RRC layer is only defined in the control plane.
  • the RRC layer controls radio resources between the UE and the network.
  • the RRC layer exchanges RRC messages between the UE and the BS.
  • the main services and functions of the RRC layer include broadcast of system information related to AS and NAS, paging, establishment, maintenance and release of an RRC connection between the UE and the network, security functions including key management, establishment, configuration, maintenance and release of radio bearers, mobility functions, QoS management functions, UE measurement reporting and control of the reporting, NAS message transfer to/from NAS from/to UE.
  • the RRC layer controls logical channels, transport channels, and physical channels in relation to the configuration, reconfiguration, and release of radio bearers.
  • a radio bearer refers to a logical path provided by L1 (PHY layer) and L2 (MAC/RLC/PDCP/SDAP sublayer) for data transmission between a UE and a network.
  • Setting the radio bearer means defining the characteristics of the radio protocol layer and the channel for providing a specific service, and setting each specific parameter and operation method.
  • Radio bearer may be divided into signaling RB (SRB) and data RB (DRB).
  • SRB signaling RB
  • DRB data RB
  • An RRC state indicates whether an RRC layer of the UE is logically connected to an RRC layer of the E-UTRAN.
  • RRC_CONNECTED when the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected state (RRC_CONNECTED). Otherwise, the UE is in the RRC idle state (RRC_IDLE).
  • RRC_INACTIVE is additionally introduced.
  • RRC_INACTIVE may be used for various purposes. For example, the massive machine type communications (MMTC) UEs can be efficiently managed in RRC_INACTIVE. When a specific condition is satisfied, transition is made from one of the above three states to the other.
  • a predetermined operation may be performed according to the RRC state.
  • RRC_IDLE public land mobile network (PLMN) selection, broadcast of system information (SI), cell re-selection mobility, core network (CN) paging and discontinuous reception (DRX) configured by NAS may be performed.
  • PLMN public land mobile network
  • SI system information
  • CN core network
  • DRX discontinuous reception
  • the UE shall have been allocated an identifier (ID) which uniquely identifies the UE in a tracking area. No RRC context stored in the base station.
  • the UE has an RRC connection with the network (i.e. E-UTRAN/NG-RAN).
  • Network-CN connection (both C/U-planes) is also established for UE.
  • the UE AS context is stored in the network and the UE.
  • the RAN knows the cell which the UE belongs to.
  • the network can transmit and/or receive data to/from UE.
  • Network controlled mobility including measurement is also performed.
  • RRC_IDLE Most of operations performed in RRC_IDLE may be performed in RRC_INACTIVE. But, instead of CN paging in RRC_IDLE, RAN paging is performed in RRC_INACTIVE. In other words, in RRC_IDLE, paging for mobile terminated (MT) data is initiated by core network and paging area is managed by core network. In RRC_INACTIVE, paging is initiated by NG-RAN, and RAN-based notification area (RNA) is managed by NG-RAN. Further, instead of DRX for CN paging configured by NAS in RRC_IDLE, DRX for RAN paging is configured by NG-RAN in RRC_INACTIVE.
  • DRX for CN paging configured by NAS in RRC_IDLE
  • DRX for RAN paging is configured by NG-RAN in RRC_INACTIVE.
  • 5GC-NG-RAN connection (both C/U-planes) is established for UE, and the UE AS context is stored in NG-RAN and the UE.
  • NG-RAN knows the RNA which the UE belongs to.
  • the NAS layer is located at the top of the RRC layer.
  • the NAS control protocol performs the functions, such as authentication, mobility management, security control.
  • the physical channels may be modulated according to OFDM processing and utilizes time and frequency as radio resources.
  • the physical channels consist of a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain and a plurality of subcarriers in frequency domain.
  • One subframe consists of a plurality of OFDM symbols in the time domain.
  • a resource block is a resource allocation unit, and consists of a plurality of OFDM symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific OFDM symbols (e.g. first OFDM symbol) of the corresponding subframe for a physical downlink control channel (PDCCH), i.e. L1/L2 control channel.
  • a transmission time interval (TTI) is a basic unit of time used by a scheduler for resource allocation. The TTI may be defined in units of one or a plurality of slots, or may be defined in units of mini-slots.
  • DL transport channels include a broadcast channel (BCH) used for transmitting system information, a downlink shared channel (DL-SCH) used for transmitting user traffic or control signals, and a paging channel (PCH) used for paging a UE.
  • DL transport channels include an uplink shared channel (UL-SCH) for transmitting user traffic or control signals and a random access channel (RACH) normally used for initial access to a cell.
  • BCH broadcast channel
  • DL-SCH downlink shared channel
  • PCH paging channel
  • UL transport channels include an uplink shared channel (UL-SCH) for transmitting user traffic or control signals and a random access channel (RACH) normally used for initial access to a cell.
  • RACH random access channel
  • Each logical channel type is defined by what type of information is transferred.
  • Logical channels are classified into two groups: control channels and traffic channels.
  • Control channels are used for the transfer of control plane information only.
  • the control channels include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH) and a dedicated control channel (DCCH).
  • BCCH is a DL channel for broadcasting system control information.
  • PCCH is DL channel that transfers paging information, system information change notifications.
  • the CCCH is a channel for transmitting control information between UEs and network. This channel is used for UEs having no RRC connection with the network.
  • the DCCH is a point-to-point bi-directional channel that transmits dedicated control information between a UE and the network. This channel is used by UEs having an RRC connection.
  • Traffic channels are used for the transfer of user plane information only.
  • the traffic channels include a dedicated traffic channel (DTCH).
  • DTCH is a point-to-point channel, dedicated to one UE, for the transfer of user information.
  • the DTCH can exist in both UL and DL.
  • BCCH in DL, BCCH can be mapped to BCH, BCCH can be mapped to DL-SCH, PCCH can be mapped to PCH, CCCH can be mapped to DL-SCH, DCCH can be mapped to DL-SCH, and DTCH can be mapped to DL-SCH.
  • CCCH can be mapped to UL-SCH
  • DCCH can be mapped to UL-SCH
  • DTCH can be mapped to UL-SCH.
  • Sidelink may comprise sidelink discovery, sidelink communication and V2X sidelink communication between UEs.
  • Sidelink uses uplink resources and physical channel structure similar to uplink transmissions.
  • FIG. 5 shows types of V2X applications to which technical features of the present invention may be applied.
  • V2X Vehicle-to-Everything
  • V2X Vehicle-to-Everything
  • V2I communication is a type of V2X communication.
  • a UE and a road side unit (RSU) using the V2I application becomes a subject of the V2I communication.
  • the RSU is an entity for supporting V2I communication, and means an entity capable of performing transmission and reception to and from a UE using a V2I application.
  • the RSU may be configured by a base station or a UE (particularly, stationary UE).
  • the base station or the UE operating as the RSU collects information (e.g., traffic light information, traffic volume information, and the like) on traffic safety and/or information on movement of peripheral vehicles, and transmits information to other UEs being a communication target or receives information from other UEs.
  • information e.g., traffic light information, traffic volume information, and the like
  • V2N communication is a type of V2X communication.
  • a UE and a serving entity using a V2N application becomes a subject of the V2N communication, and the UE and the serving entity communicate with each other through an LTE network entity.
  • V2P communication is a type of V2X communication. Two UE using a V2P application become a subject of the V2P communication.
  • V2V communication is a type of V2X communication. Two UE using a V2V application become a subject of the V2V communication. The difference of V2V communication from V2P communication is in that one UE becomes a UE of a pedestrian in the V2P communication, and one UE becomes a UE of a vehicle in the V2V communication.
  • V2X services can be provided by PC5 interface and/or Uu interface.
  • PC5 interface means an interface used in direct communication between two UEs, which is an interface used for communication between devices for supporting a Proximity Service (ProSe).
  • ProSe Proximity Service
  • Support of V2X services via PC5 interface is provided by V2X sidelink communication, which is a mode of communication whereby UEs can communicate with each other directly over the PC5 interface. This communication mode is supported when the UE is served by E-UTRAN and when the UE is outside of E-UTRA coverage. Only the UEs authorized to be used for V2X services can perform V2X sidelink communication.
  • the UE supporting V2X sidelink communication can operate in two modes for resource allocation.
  • the UE needs to be RRC_CONNECTED in order to transmit data.
  • the UE requests transmission resources from the BS.
  • the BS schedules transmission resources for transmission of sidelink control information and data.
  • Sidelink SPS is supported for scheduled resource allocation.
  • the UE on its own selects resources from resource pools and performs transport format selection to transmit sidelink control information and data. If mapping between the zones and V2X sidelink transmission resource pools is configured, the UE selects V2X sidelink resource pool based on the zone UE is located in. The UE performs sensing for (re)selection of sidelink resources. Based on sensing results, the UE (re)selects some specific sidelink resources and reserves multiple sidelink resources.
  • BSR sidelink buffer status reporting
  • the sidelink buffer status reporting procedure is used to provide the serving eNB with information about the amount of sidelink data available for transmission in the SL buffers associated with the MAC entity.
  • RRC controls BSR reporting for the sidelink by configuring the two timers periodic-BSR-TimerSL and retx-BSR-TimerSL.
  • Each sidelink logical channel belongs to a ProSe Destination.
  • Each sidelink logical channel is allocated to an LCG depending on the priority and optionally ProSe Per-Packet Reliability (PPPR) of the sidelink logical channel, and the mapping between LCG ID and priority and optionally the mapping between LCG ID and PPPR which are provided by upper layers in logical channel group information list.
  • LCG is defined per ProSe Destination.
  • a sidelink Buffer Status Report shall be triggered if any of the following events occur:
  • the MAC entity has a configured SL-RNTI or a configured SL-V-RNTI:
  • - SL data for a sidelink logical channel of a ProSe Destination, becomes available for transmission in the RLC entity or in the PDCP entity and either the data belongs to a sidelink logical channel with higher priority than the priorities of the sidelink logical channels which belong to any LCG belonging to the same ProSe Destination and for which data is already available for transmission, or there is currently no data available for transmission for any of the sidelink logical channels belonging to the same ProSe Destination, in which case the Sidelink BSR is referred below to as "Regular Sidelink BSR";
  • Padding Sidelink BSR UL resources are allocated and number of padding bits remaining after a Padding BSR has been triggered is equal to or larger than the size of the Sidelink BSR MAC control element containing the buffer status for at least one LCG of a ProSe Destination plus its subheader, in which case the Sidelink BSR is referred below to as "Padding Sidelink BSR";
  • An SL-RNTI or an SL-V-RNTI is configured by upper layers and SL data is available for transmission in the RLC entity or in the PDCP entity, in which case the Sidelink BSR is referred below to as "Regular Sidelink BSR".
  • a MAC PDU shall contain at most one Sidelink BSR MAC control element, even when multiple events trigger a Sidelink BSR by the time a Sidelink BSR can be transmitted in which case the Regular Sidelink BSR and the Periodic Sidelink BSR shall have precedence over the padding Sidelink BSR.
  • the MAC entity shall restart retx-BSR-TimerSL upon reception of an SL grant.
  • All triggered regular Sidelink BSRs shall be cancelled in case the remaining configured SL grant(s) valid for this sidelink control (SC) Period can accommodate all pending data available for transmission in sidelink communication or in case the remaining configured SL grant(s) valid can accommodate all pending data available for transmission in V2X sidelink communication.
  • All triggered Sidelink BSRs shall be cancelled in case the MAC entity has no data available for transmission for any of the sidelink logical channels. All triggered Sidelink BSRs shall be cancelled when a Sidelink BSR (except for Truncated Sidelink BSR) is included in a MAC PDU for transmission. All triggered Sidelink BSRs shall be cancelled, and retx-BSR-TimerSL and periodic-BSR-TimerSL shall be stopped, when upper layers configure autonomous resource selection.
  • the MAC entity shall transmit at most one Regular/Periodic Sidelink BSR in a TTI. If the MAC entity is requested to transmit multiple MAC PDUs in a TTI, it may include a padding Sidelink BSR in any of the MAC PDUs which do not contain a Regular/Periodic Sidelink BSR.
  • All Sidelink BSRs transmitted in a TTI always reflect the buffer status after all MAC PDUs have been built for this TTI.
  • Each LCG shall report at the most one buffer status value per TTI and this value shall be reported in all Sidelink BSRs reporting buffer status for this LCG.
  • FIG. 6 shows sidelink BSR MAC Control Elements to which technical features of the present invention may be applied. Specifically, FIG. 6(a) shows sidelink BSR and truncated sidelink BSR MAC control element for even N, and FIG. 6(b) shows sidelink BSR and truncated sidelink BSR MAC control element for odd N.
  • Sidelink BSR and Truncated Sidelink BSR MAC control elements include one Destination Index field, one LCG ID field and one corresponding Buffer Size field per reported target group.
  • the Sidelink BSR MAC control elements are identified by MAC PDU subheaders with LCIDs as specified in Table 1. They have variable sizes.
  • the Destination Index field identifies the ProSe Destination or the destination for V2X sidelink communication.
  • the length of this field is 4 bits.
  • the value is set to the index of the destination reported in destination information list for sidelink communication or is set to one index among index(es) associated to same destination reported in destination information list for V2X sidelink communication.
  • the Logical Channel Group ID field identifies the group of logical channel(s) which buffer status is being reported.
  • the length of the field is 2 bits.
  • the Buffer Size field identifies the total amount of data available across all logical channels of a LCG of a ProSe Destination after all MAC PDUs for the TTI have been built.
  • the amount of data is indicated in number of bytes. It shall include all data that is available for transmission in the RLC layer and in the PDCP layer.
  • the size of the RLC and MAC headers are not considered in the buffer size computation.
  • the length of this field is 6 bits.
  • Buffer Sizes of LCGs are included in decreasing order of the highest priority of the sidelink logical channel belonging to the LCG irrespective of the value of the Destination Index field.
  • FIG. 7 shows a procedure for explaining a problem that may occur when packet duplication is applied for the sidelink transmission.
  • the UE interested in the packet duplication for a sidelink transmission transmits sidelink UE information to the BS.
  • the sidelink UE information may include information on frequency 1, a destination 1 related to the frequency 1, information on frequency 2, and a destination 1 related to the frequency 2.
  • a destination index of the destination 1 related to the frequency 1 and a destination index of the destination 1 related to the frequency 2 may be different.
  • the destination index of the destination 1 related to the frequency 1 may be a zero, but the destination index of the destination 1 related to the frequency 2 may be a two.
  • the BS cannot know whether or not the frequency 2 is a frequency for the packet duplication in the sidelink transmission.
  • a method for informing that the frequency 1 and frequency 2 are related for the packet duplication needs to be suggested.
  • a method for performing packet duplication and an apparatus supporting the same will be described.
  • FIG. 8 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the UE may determine whether or not to perform packet duplication. If a threshold information is provided, the UE may compare reliability level of the generated packets with the provided threshold information. If the reliability level of the generated packets is lower than or equal to the threshold information, the UE may transmit interested frequency information where the UE is interested in transmitting duplicated packets to the network (e.g. base station). For instance, the reliability level may include high level, medium level and low level. For instance, the reliability level may include a positive integer number (may also include zero). For instance, the threshold information with regards to reliability level may include high level, medium level and low level. For instance, the threshold information with regards to reliability level may include a positive integer number (may also include zero).
  • the threshold information may be provided by the network via broadcast/dedicated signalling or preconfigured in the UE. When the UE is in coverage of the network or the network provides the threshold information, the UE may utilize the threshold information provided by the network.
  • the UE may determine whether or not the duplication is required by itself.
  • the UE may transmit first information on first frequency, second information on second frequency for packet duplication and third information on second frequency related to first frequency. For instance, the UE may transmit interested frequency information where the UE is interested in transmitting duplicated packets optionally based on a (pre)configured threshold information.
  • the interested frequency information may be transmitted in RRC signalling or MAC signalling.
  • the example of the RRC signalling is Sidelink UE Information message.
  • the example of the MAC signalling is sidelink buffer state report (BSR).
  • the example of the MAC signalling is MAC control element (CE).
  • the UE interested in the packet duplication for a sidelink transmission transmits sidelink UE information to the BS.
  • the sidelink UE information may include information on frequency 1, a destination 1 related to the frequency 1, information on frequency 2, and a destination 1 related to the frequency 2.
  • a destination index of the destination 1 related to the frequency 1 and a destination index of the destination 1 related to the frequency 2 may be different.
  • the destination index of the destination 1 related to the frequency 1 may be a zero, but the destination index of the destination 1 related to the frequency 2 may be a two.
  • the UE may transmit information on second frequency related to first frequency. For instance, the UE may transmit the sidelink BSR including the destination index 0 of the destination 1 related to the frequency 1. Alternatively, the UE may transmit the sidelink BSR including the destination index 2 of the destination 1 related to the frequency 2.
  • the BS can know that the frequency 1 and the frequency 2 are related for the packet duplication in the sidelink transmission.
  • the network is able to know the reliability information of control the level of duplication to guarantee the reliability of the packet while it does not cause additional overhead for BSR.
  • the information provided by the UE to the network may include one or more following information.
  • index of a destination in destination identity list in the sidelink UE information message
  • index of a destination in destination identity list in the sidelink UE information message
  • index of a destination where original packet is to be transmitted for packet duplication for a certain service
  • the example of the above method may be as follows.
  • the examples below may be different in terms of the UE's information and method of expression of reliability level/associated threshold. It is assumed that the frequency 1 and the frequency 2 are associated with an interested service of the UE.
  • FIG. 9 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the network may configure reliability threshold information.
  • the reliability threshold information may be set to 3.
  • the UE may determine whether the reliability level of (to be) generated packets (i.e. PPPR) are lower than or equal to the provided threshold '3'. If the reliability level of (to be) generated packets is higher than the provided threshold '3', the UE may only include one of the frequencies and associated destination address. For instance, the UE may transmit sidelink UE information only including an index of frequency 1 and an index of destination 1 related to the frequency 1. It is assumed that the index of destination 1 related to the frequency 1 is '0'.
  • step S930 if the reliability level of (to be) generated packets is lower than or equal to the provided threshold '3', the UE additionally includes another frequency for duplication and associated destination address. For instance, the UE may transmit sidelink UE information including an index of frequency 1, an index of destination 1 related to the frequency 1, an index of frequency 2, and an index of destination 1 related to the frequency 2. It is assumed that the index of destination 1 related to the frequency 2 is '2'.
  • step S935 further, the UE may transmit a sidelink BSR including the index of destination 1 related to the frequency 1 (i.e. '0').
  • the UE may transmit a sidelink BSR including the index of destination 1 related to the frequency 2 (i.e. '2').
  • the BS can know that the frequency 1 and the frequency 2 are related for the packet duplication, based on the index of destination 1. After then, the BS can allocate resources for the packet duplication to the UE.
  • FIG. 10 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the network may configure reliability threshold information.
  • the reliability threshold information may be set to 3.
  • the UE may determine whether the reliability level of (to be) generated packets (i.e. PPPR) are lower than or equal to the provided threshold '3'. If the reliability level of (to be) generated packets is higher than the provided threshold '3', the UE may only include one of the frequencies and associated destination address. For instance, the UE may transmit sidelink UE information only including an index of frequency 1 and an index of destination 1 related to the frequency 1. It is assumed that the index of destination 1 related to the frequency 1 is '0'.
  • the UE may additionally include another frequency for duplication, associated destination address and frequency information where original packet is to be transmitted. For instance, the UE may transmit sidelink UE information including an index of frequency 1, an index of destination 1 related to the frequency 1, an index of frequency 2, an index of destination 1 related to the frequency 2, and the index of frequency 1 where original packet is to be transmitted. It is assumed that the index of destination 1 related to the frequency 2 is '2'. Thus, the BS can know that the frequency 1 and the frequency 2 are related for the packet duplication, based on the index of frequency 1 where original packet is to be transmitted. After then, the BS can allocate resources for the packet duplication to the UE.
  • FIG. 11 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the network may configure reliability threshold information.
  • the reliability threshold information may be set to 'medium'.
  • the UE may determine whether the reliability level of (to be) generated packets (i.e. PPPR) are higher than or equal to the provided threshold 'medium'. If the reliability level of (to be) generated packets is lower than the provided threshold 'medium' (e.g. 'low'), the UE may only include one of the frequencies and associated destination address.
  • the reliability level of (to be) generated packets i.e. PPPR
  • step S1130 if the reliability level of (to be) generated packets is higher than or equal to the provided threshold 'medium' (e.g. 'high' and 'medium'), the UE may additionally include another frequency for duplication, associated destination address and flag indicating that duplication is required. Then, the UE may transmit the sidelink UE Information to the network.
  • the provided threshold 'medium' e.g. 'high' and 'medium'
  • FIG. 12 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the network may configure reliability threshold information.
  • the reliability threshold information may be set to 3.
  • the UE may determine whether the reliability level of (to be) generated packets (i.e. PPPR) are lower than or equal to the provided threshold '3'. If the reliability level of (to be) generated packets is higher than the provided threshold '3', the UE may only include one of the frequencies and associated destination address. For instance, the UE may transmit sidelink UE information only including an index of frequency 1 and an index of destination 1 related to the frequency 1. It is assumed that the index of destination 1 related to the frequency 1 is '0'.
  • the UE may additionally include another frequency for duplication, associated destination address, and one common number indicating that duplication is required and which frequency is associated frequency. For instance, the UE may transmit sidelink UE information including an index of frequency 1, an index of destination 1 related to the frequency 1, a common number related to the frequency 1, an index of frequency 2, an index of destination 1 related to the frequency 2, and a common number related to the frequency 2. It is assumed that the index of destination 1 related to the frequency 2 is '2'. Thus, the BS can know that the frequency 1 and the frequency 2 are related for the packet duplication, based on the common number. After then, the BS can allocate resources for the packet duplication to the UE.
  • FIG. 13 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the network may configure reliability threshold information.
  • the reliability threshold information may be set to 3.
  • the UE may determine whether the reliability level of (to be) generated packets (i.e. PPPR) are lower than or equal to the provided threshold '3'. If the reliability level of (to be) generated packets is higher than the provided threshold '3', the UE may consider the duplication is not allowed and then transmit sidelink UE information to the network with the following information:
  • step S1330 if the reliability level of (to be) generated packets is lower than or equal to the provided threshold '3', the UE may consider the duplication is allowed and then transmit sidelink UE information to the network with the following information:
  • the UE transmits the sidelink UE information to the network.
  • FIG. 14 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the UE may be interested in carrier aggregation for a certain service which is associated with destination identity 1.
  • the service may be mapped to the frequency 1 and the frequency 2.
  • the UE may be also interested in another service which is associated with destination identity 0.
  • the service is mapped to the frequency 1.
  • the UE may additionally include another frequency for carrier aggregation, associated destination identity and index of a destination (in destination identity list in the sidelink UE information message) for which carrier aggregation is to be performed.
  • the UE may send SL-BSR on one destination index to the network. After receiving SL-BSR, the network may allocate the grant on the frequency 1 and the frequency 2 associated with destination 1.
  • FIG. 15 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the UE may be interested in carrier aggregation for a certain service which is associated with destination identity 1.
  • the service may be mapped to the frequency 1 and the frequency 2.
  • the UE may be also interested in another service which is associated with destination identity 0.
  • the service is mapped to the frequency 1.
  • the UE may additionally include another frequency for carrier aggregation, associated destination identity.
  • the UE may send SL-BSR on one destination index to the network. After receiving SL-BSR, the network may allocate the grant on the frequency 1 and the frequency 2 associated with destination 1.
  • FIG. 16 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the network may configure reliability threshold information.
  • the reliability threshold information may be set to 3.
  • the UE may determine whether the reliability level of (to be) generated packets (i.e. PPPR) are lower than or equal to the provided threshold '3'. If the reliability level of (to be) generated packets is higher than the provided threshold '3', the UE may only include one of the frequencies and associated destination address.
  • the reliability level of (to be) generated packets i.e. PPPR
  • the network may configure the UE with mode 3 operation (i.e. scheduled mode).
  • step S1634 further, if the reliability level of (to be) generated packets is lower than or equal to the provided threshold '3', the UE may transmit two BSRs to the network, which are one on the frequency 1 and another on the frequency 2.
  • the BSR on the frequency 2 may inform the buffer status for the duplicated packets on the frequency 2.
  • the UE may indicate that BSR is for duplicated packets.
  • the example format of BSR is described in FIG. 6. The two BSR can be transmitted in the same MAC PDU.
  • the UE may transmit MAC subheader to the network.
  • the MAC subheader as described in FIG. 17, one reserved field may indicate whether the PDU is for the duplicated.
  • FIG. 17 shows examples of MAC subheader and MAC PDU consisting of MAC header, MAC control elements, MAC SDUs and padding according to an embodiment of the present invention.
  • FIG. 18 shows a procedure for informing that multiple frequencies are related for the packet duplication according to an embodiment of the present invention.
  • the network may configure reliability threshold information.
  • the reliability threshold information may be set to 3.
  • the UE may determine whether the reliability level of (to be) generated packets (i.e. PPPR) are lower than or equal to the provided threshold '3'. If the reliability level of (to be) generated packets is higher than the provided threshold '3', the UE may only include one of the frequencies and associated destination address.
  • the reliability level of (to be) generated packets i.e. PPPR
  • the network may configure the UE with mode 3 operation (i.e. scheduled mode).
  • step S1834 further, if the reliability level of (to be) generated packets is lower than or equal to the provided threshold '3' and the SPS configuration is required, the UE may transmit UE assistance information to the network.
  • the UE assistance information the UE may include destination index and indicate that the duplication is required for the associated destination index.
  • step S1836 after receiving the UE assistance information, the network may activate SPS in the frequency 1 and the frequency 2 for the service associated with the destination index.
  • FIG. 19 shows a method for informing that multiple frequencies are related for packet duplication by a UE according to an embodiment of the present invention.
  • the present invention described above for UE side may be applied to this embodiment.
  • the UE may determine whether or not to perform the packet duplication. Whether or not to perform the packet duplication may be determined by the UE based on a reliability level of a packet and a threshold for the packet duplication.
  • the UE may transmit first information on a first frequency and second information on a second frequency for the packet duplication.
  • the first frequency may be related to a first destination
  • the second frequency may be related to the first destination.
  • the first information may include an index of the first frequency and a first destination information related to the first frequency
  • the second information may include an index of the second frequency and a second destination information related to the second frequency.
  • step S1930 the UE transmits third information informing that the first frequency and the second frequency are related for the packet duplication.
  • the third information may be transmitted to a base station (BS).
  • the third information may include an index of the first frequency to which original packet is transmitted.
  • the third information may include an index of a first destination related to the first frequency. Based on the index of the first destination related to the first frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may be transmitted by being included in a sidelink buffer state report (BSR).
  • BSR sidelink buffer state report
  • the first information and the second information may be transmitted by being included in a sidelink UE information message.
  • the third information may include an index of a first destination related to the second frequency. Based on the index of the first destination related to the second frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may include a flag informing that the packet duplication is required.
  • FIG. 20 shows a UE to implement an embodiment of the present invention.
  • the present invention described above for UE side may be applied to this embodiment.
  • a UE 2000 includes a processor 2010, a memory 2020 and a transceiver 2030.
  • the processor 2010 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of the radio interface protocol may be implemented in the processor 2010.
  • the processor 2010 may determine whether or not to perform the packet duplication. Whether or not to perform the packet duplication may be determined by the processor 2010 based on a reliability level of a packet and a threshold for the packet duplication.
  • the processor 2010 may transmit first information on a first frequency and second information on a second frequency for the packet duplication.
  • the first frequency may be related to a first destination
  • the second frequency may be related to the first destination.
  • the first information may include an index of the first frequency and a first destination information related to the first frequency
  • the second information may include an index of the second frequency and a second destination information related to the second frequency.
  • the processor 2010 may control the transceiver 2030 to transmit third information informing that the first frequency and the second frequency are related for the packet duplication.
  • the third information may be transmitted to a base station (BS).
  • BS base station
  • the third information may include an index of the first frequency to which original packet is transmitted.
  • the third information may include an index of a first destination related to the first frequency. Based on the index of the first destination related to the first frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may be transmitted by being included in a sidelink buffer state report (BSR).
  • BSR sidelink buffer state report
  • the first information and the second information may be transmitted by being included in a sidelink UE information message.
  • the third information may include an index of a first destination related to the second frequency. Based on the index of the first destination related to the second frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may include a flag informing that the packet duplication is required.
  • the memory 2020 is operatively coupled with the processor 2010 and stores a variety of information to operate the processor 2010.
  • the transceiver 2030 is operatively coupled with the processor 2010, and transmits and/or receives a radio signal.
  • FIG. 21 shows a method for packet duplication by a BS according to an embodiment of the present invention.
  • the present invention described above for BS side may be applied to this embodiment.
  • the base station may receive a sidelink UE information including first information on a first frequency and second information on a second frequency for a packet duplication, from a user equipment (UE).
  • UE user equipment
  • the base station may receive sidelink buffer state report (BSR) including third information informing that the first frequency and the second frequency are related for the packet duplication, from the UE.
  • BSR sidelink buffer state report
  • the third information may include an index of the first frequency to which original packet is transmitted.
  • the third information may include an index of a first destination related to the first frequency. Based on the index of the first destination related to the first frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may be transmitted by being included in a sidelink buffer state report (BSR).
  • BSR sidelink buffer state report
  • the first information and the second information may be transmitted by being included in a sidelink UE information message.
  • the third information may include an index of a first destination related to the second frequency. Based on the index of the first destination related to the second frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may include a flag informing that the packet duplication is required.
  • FIG. 22 shows a BS to implement an embodiment of the present invention.
  • the present invention described above for BS side may be applied to this embodiment.
  • a BS 2200 includes a processor 2210, a memory 2220 and a transceiver 2230.
  • the processor 2210 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of the radio interface protocol may be implemented in the processor 2210.
  • the processor 2210 may control the transceiver 2230 to receive a sidelink UE information including first information on a first frequency and second information on a second frequency for a packet duplication, from the transceiver 2030.
  • the processor 2210 may control the transceiver 2230 to receive sidelink buffer state report (BSR) including third information informing that the first frequency and the second frequency are related for the packet duplication, from the transceiver 2030.
  • BSR sidelink buffer state report
  • the third information may include an index of the first frequency to which original packet is transmitted.
  • the third information may include an index of a first destination related to the first frequency. Based on the index of the first destination related to the first frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may be transmitted by being included in a sidelink buffer state report (BSR).
  • BSR sidelink buffer state report
  • the first information and the second information may be transmitted by being included in a sidelink UE information message.
  • the third information may include an index of a first destination related to the second frequency. Based on the index of the first destination related to the second frequency, the BS may determine that the first frequency and the second frequency are related for the packet duplication.
  • the third information may include a flag informing that the packet duplication is required.
  • the memory 2220 is operatively coupled with the processor 2210 and stores a variety of information to operate the processor 2210.
  • the transceiver 2230 is operatively coupled with the processor 2210, and transmits and/or receives a radio signal.
  • the processor 2010, 2210 may include an application-specific integrated circuit (ASIC), a separate chipset, a logic circuit, and/or a data processing unit.
  • the memory 2020, 2220 may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and/or other equivalent storage devices.
  • the transceiver 2030, 2230 may include a base-band circuit for processing a wireless signal.
  • the aforementioned methods can be implemented with a module (i.e., process, function, etc.) for performing the aforementioned functions.
  • the module may be stored in the memory and may be performed by the processor 2010, 2210.
  • the memory 2020, 2220 may be located inside or outside the processor 2010, 2210, and may be coupled to the processor 2010, 2210 by using various well-known means.

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Abstract

L'invention concerne un procédé pour informer que de multiples fréquences sont associées à la duplication de paquets par un équipement utilisateur (UE) dans un système de communication sans fil, ainsi qu'un appareil prenant en charge ce procédé. Le procédé peut comprendre les étapes suivantes : déterminer s'il faut ou non réaliser la duplication de paquets ; lorsqu'il est déterminé qu'il faut effectuer la duplication de paquets, transmettre des premières informations sur une première fréquence et des deuxièmes informations sur une deuxième fréquence pour la duplication de paquets ; et transmettre des troisièmes informations informant que la première fréquence et la deuxième fréquence sont associées à la duplication de paquets.
PCT/KR2019/001579 2018-02-08 2019-02-08 Procédé et appareil de notification de duplication de paquets WO2019156507A1 (fr)

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US10772008B2 (en) * 2018-01-11 2020-09-08 Comcast Cable Communications, Llc Cell configuration for packet duplication
US11533659B2 (en) 2018-01-11 2022-12-20 Comcast Cable Communications, Llc Cell configuration for packet duplication
US11877185B2 (en) 2018-01-11 2024-01-16 Comcast Cable Communications, Llc Cell configuration for packet duplication
US20190253927A1 (en) * 2018-02-13 2019-08-15 Samsung Electronics Co., Ltd Method and apparatus for transmitting and receiving duplicated data in wireless communication system

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