WO2016050042A1 - 数据同步处理方法及装置 - Google Patents

数据同步处理方法及装置 Download PDF

Info

Publication number
WO2016050042A1
WO2016050042A1 PCT/CN2015/075919 CN2015075919W WO2016050042A1 WO 2016050042 A1 WO2016050042 A1 WO 2016050042A1 CN 2015075919 W CN2015075919 W CN 2015075919W WO 2016050042 A1 WO2016050042 A1 WO 2016050042A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
pdcp
layer
rlc
data synchronization
Prior art date
Application number
PCT/CN2015/075919
Other languages
English (en)
French (fr)
Inventor
郝鹏
郁光辉
谢峰
孙云锋
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to JP2017517024A priority Critical patent/JP2017530644A/ja
Priority to EP15846255.6A priority patent/EP3203705A4/en
Priority to US15/515,340 priority patent/US20170238195A1/en
Publication of WO2016050042A1 publication Critical patent/WO2016050042A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2212/00—Encapsulation of packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/045—Interfaces between hierarchically different network devices between access point and backbone network device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to the field of communications, and in particular to a data synchronization processing method and apparatus.
  • cell splitting will be the key to achieving the 5G system capacity growth target.
  • the 4G system obtains the cell splitting gain through a Heterogeneous Network (HetNet).
  • HetNet Heterogeneous Network
  • TP low-power transmission point
  • eNodeB or eNB a low-power transmission point
  • Small small cell
  • Multi-layer network composed of Cell HetNet can not only improve the flexibility of cell splitting and system capacity while ensuring coverage, but also share the service pressure of the macro cell and expand the coverage of the macro cell.
  • 3GPP proposed the Small Cell enhancement technology, and carried out preliminary research on the problems that arise when high-density small cells are deployed.
  • the Ultra Dense Network (UDN) is proposed, which can be seen as a further evolution of Small Cell enhancement technology.
  • the TP density will be further increased, and the coverage of the TP will be further reduced (tens of meters or even ten meters), and each TP may serve only one or a few users at the same time.
  • the ultra-dense deployment brings the distance between the TP and the terminal (or UE, User Equipment), so that their transmit power can be greatly reduced and become very close, and the difference between the uplink and the downlink is also The smaller it is.
  • Mobility and interference problems are two major technical challenges that UDN networks must address. Due to the high TP density and small TP coverage, the terminal frequently switches between TPs during motion. Frequent switching can cause huge signaling pressure on the network, causing deterioration of TCP/IP performance and seriously affecting the user experience. On the other hand, the high-density deployment of TP will also make the network interference environment more complicated and limit the capacity increase.
  • FIG. 1 is a schematic diagram of a virtual cell in the related art. As shown in FIG. 1 , during a user mobility or a change of a surrounding environment, a new TP is added to a virtual cell, and an old TP is detached from the virtual cell, so that the virtual cell moves with the user. And move or As the surrounding environment changes to ensure the consistency of the user experience, this process is called forming or reforming of the cell.
  • each TP needs to adopt the same user data encapsulation method to achieve effective virtualization, that is, realize joint data transmission of each TP or flexible conversion between TPs without causing interruption of user data transmission.
  • the process by which each TP agrees on the way user data is encapsulated is called data synchronization. How to achieve data synchronization is an urgent problem to be solved by the community virtualization technology.
  • FIG. 2 is a schematic diagram of a user plane protocol stack in the related art.
  • the user plane protocol stack of the LTE Long Term Evolution
  • LTE Long Term Evolution
  • the MAC Medium Access Control
  • PHY Physical Layer
  • SDU Service Data Unit
  • the receiving side is reversed.
  • LTE also has a control plane, and its protocol stack is shown in Figure 2 (right).
  • the PDCP layer is mainly responsible for performing Header compression and decompression, Transfer of user data, In-sequence delivery of upper layer PDUs, and Duplicate detection of Lower layer SDUs), Retransmission of PDCP SDUs, Ciphering and Deciphering, Timer-based SDU discard.
  • the PDCP layer PDU is divided into a control plane PDCP Data PDU (bearer control plane data), a user plane PDCP Data PDU (bearer user plane user data), and a PDCP Control PDU (bearer PDCP control information).
  • the RLC layer is responsible for delivering the Transfer of upper layer PDUs, Error Correction through ARQ, Concatenation, Segmentation and Reassembly of RLC SDUs, Re-segmentation of RLC data PDUs, reordering of RLC data PDUs, Duplicate detection, protocol error detection, packet discarding (RLC SDU discard), RLC layer reconstruction (RLC re-establishment);
  • the MAC layer is responsible for the mapping of logical channels and transport channels, the multiplexing/demultiplexing of MAC SDUs, and the scheduling information reporting.
  • the PHY layer is responsible Operations such as modulation/demodulation, encoding/decoding, interleaving/deinterleaving, and physical signal processing.
  • the RLC layer PDU consists of a header and data (or only data).
  • the header is used to indicate the length, type, and other information of the RLC SDU.
  • the MAC layer PDU is composed of a MAC layer header and a MAC layer payload.
  • the MAC layer load is composed of a MAC layer control unit (MAC CE), a MAC layer SDU, and a padding bit (for the length of the MAC layer PDU to meet a specific requirement).
  • the MAC layer header includes multiple sub-packets, corresponding to MAC CE, MAC SDU, and padding bit, and is used to indicate information (length, relative position in the MAC PDU) of each element (MAC CE, MAC SDU or padding bit) in the MAC layer load. , information type, etc.).
  • the complete downlink data synchronization refers to synchronization between the PDCP layer and the MAC layer between different TPs, including the encapsulation mode of each layer of data packets, the value of each layer state variable, and the state of the timer. It is also possible to perform data encapsulation from the PDCP layer to the MAC layer in one TP, and then complete synchronization by transmitting the MAC layer data packet to other TPs (ie, in each TP, since the MAC layer data packets are identical, the MAC layer data The PDCP layer/RLC layer data encapsulated by the packet is also identical. In the state of complete data synchronization, the virtual cell can dynamically select the TP serving as the terminal to obtain the best virtualization effect.
  • each layer of the protocol stack needs to add extra overhead based on the layer SDU to form a PDU to implement the functions that the layer needs to support. Therefore, although the more layers that implement data synchronization, the better the effect of cell virtualization, the more complicated the data synchronization process becomes, and the greater the overhead for data synchronization. Therefore, how to control the overhead of data synchronization under the premise of ensuring the effect of cell virtualization is a problem that needs to be solved when designing the data synchronization process.
  • the present invention provides a data synchronization processing method and apparatus for solving data synchronization problems between TPs in a cell virtualization process.
  • the PDCP layer data is synchronized from the TP to the protocol data unit PDU of the PDCP layer of the primary TP.
  • the PDCP layer data synchronization is performed by at least one of the following: a manner of data packet forwarding, where the data packet forwarding manner includes: the primary TP sends the PDU of the PDCP layer to a
  • the TP is a signaling method, where the signaling manner includes: the primary TP sends the PDCP layer data synchronization information to the secondary TP, and the data synchronization information is used by the secondary TP to the PDCP.
  • the layer SDU is encapsulated to form a PDCP layer PDU.
  • the PDCP layer data synchronization information includes at least one of the following: header compression information, encryption information, a PDCP layer header, a PDCP packet sequence number, a superframe number, and a maximum packet sequence number.
  • the PDCP/RLC/MAC layer data synchronization is that the slave TP is the same as the PDCP, RLC, MAC layer PDU of the primary TP; or the MAC layer PDU is the same.
  • the TP is the same as the PDU of the PDCP, the RLC, and the MAC layer of the primary TP by using at least one of the following manners: by means of signaling, where the signaling manner includes: the primary TP Transmitting the data synchronization information of the PDCP layer, the RLC layer, and the MAC layer data to the slave TP, where the data synchronization information of the PDCP layer, the RLC layer, and the MAC layer is used by the TP to the PDCP layer, the RLC layer,
  • the MAC layer SDU is encapsulated to form a PDCP layer, an RLC layer, and a MAC layer PDU.
  • the signaling and packet forwarding manner is performed, wherein the signaling and packet forwarding manner includes: the primary TP transmitting the PDCP layer PDU to the From the TP, and transmitting data synchronization information of the RLC/MAC layer to the slave TP, the data synchronization information is used to form the RLC and MAC layer PDUs by the slave TP; or the master TP sends the PDCP layer SDU to the Deriving from the TP, and transmitting data synchronization information of the PDCP/RLC/MAC layer to the slave TP, where the data synchronization information is used to form a PDCP, RLC, MAC layer PDU.
  • the method includes at least one of the following: the PDCP layer data synchronization information includes at least one of: header compression information, encryption information, a PDCP layer header, a PDCP packet sequence number, a superframe number, a maximum packet sequence number, and the RLC.
  • the data synchronization information includes at least one of: an RLC transmission buffer status, an RLC layer PDU header; the MAC layer data synchronization information includes at least one of: scheduling and resource allocation information, a MAC layer header; a MAC layer control element; and a MAC layer The correspondence between the sub-packet header in the packet header and the serial number of the MAC SDU.
  • the PDCP/RLC/MAC layer data synchronization is the same as the MAC layer PDU, and is implemented by using a packet forwarding manner, including: the primary TP sends a MAC layer PDU to the secondary TP.
  • the PDCP layer data synchronization comprises: performing, by the TP, the PDCP layer synchronization with the primary TP, and then performing RLC/MAC layer data synchronization.
  • the primary TP after performing PDCP layer synchronization, notifies the RLC/MAC layer data synchronization by the TP.
  • the PDCP layer data synchronization includes at least one of: the primary TP instructing a node to send a data packet to the secondary TP; the primary TP instructing the secondary TP to receive data from a node; the primary TP Instructing the slave TP to send a data request to the node, and the slave TP sends a data transmission request to the node, and the node sends data to the slave TP.
  • the primary TP when the primary TP indicates that the primary TP indicates that the data packet is sent to the secondary TP, the primary TP sends the identification information of the secondary TP to the node; and the primary TP indicates that the secondary TP receives the secondary node.
  • the primary TP sends the identification information of the data packet to the secondary TP; the primary TP indicates that the secondary TP sends a data request to the node, and the secondary TP sends a data transmission request to the node.
  • the node sends data to the slave TP
  • the slave TP sends the identifier information of the requested data packet to the node.
  • the secondary TP detects whether a data packet from the node contains identification information corresponding to the secondary TP.
  • the identifier information of the data packet includes at least one of the following: a virtual cell identifier, a connection identifier, and a user equipment identifier.
  • the node is a gateway or a TP.
  • the TP includes at least one of the following: a macro base station, a small base station, an RRH, and a micro base station.
  • the PDCP layer data is synchronized from the TP to the protocol data unit PDU of the PDCP layer of the primary TP.
  • the PDCP layer data synchronization is performed by at least one of the following: a manner of data packet forwarding, where the data packet forwarding manner includes: receiving, by the TP, the PDCP layer sent by the primary TP And the signaling manner, wherein the signaling manner includes: receiving, by the TP, the PDCP layer data synchronization information sent by the primary TP, where the secondary TP is based on the data synchronization information to the PDCP layer.
  • the SDU is encapsulated to form a PDCP layer PDU.
  • the PDCP layer data synchronization information includes at least one of the following: header compression information, encryption information, a PDCP layer header, a PDCP packet sequence number, a superframe number, and a maximum packet sequence number.
  • the PDCP/RLC/MAC layer data synchronization is that the slave TP is the same as the PDCP, RLC, MAC layer PDU of the primary TP; or the MAC layer PDU is the same.
  • the TP is the same as the PDU of the PDCP, the RLC, and the MAC layer of the primary TP by using at least one of the following manners: a signaling manner, where the signaling manner includes: the secondary TP Receiving data synchronization information of the PDCP layer, the RLC layer, and the MAC layer data sent by the primary TP, and the data synchronization information of the secondary TP according to the PDCP layer, the RLC layer, and the MAC layer to the PDCP layer, the RLC layer, and the MAC
  • the layer SDU is encapsulated to form a PDCP layer, an RLC layer, and a MAC layer PDU.
  • the signaling and packet forwarding manner is as follows: the manner in which the signaling and packet forwarding is performed includes: receiving, by the TP, the PDCP layer of the primary TP transmission a PDU, and data synchronization information of the RLC/MAC layer, the slave TP forming an RLC and a MAC layer PDU from the TP according to the data synchronization information; or receiving, by the TP, a PDCP layer SDU sent by the primary TP, and Data synchronization information of the PDCP/RLC/MAC layer, and forms PDCP, RLC, and MAC layer PDUs according to the data synchronization information.
  • the method includes at least one of the following: the PDCP layer data synchronization information includes at least one of: header compression information, encryption information, a PDCP layer header, a PDCP packet sequence number, a superframe number, a maximum packet sequence number, and the RLC.
  • the data synchronization information includes at least one of: an RLC transmission buffer status, an RLC layer PDU header; the MAC layer data synchronization information includes at least one of: scheduling and resource allocation information, a MAC layer header; a MAC layer control element; and a MAC layer The correspondence between the sub-packet header in the packet header and the serial number of the MAC SDU.
  • the PDCP/RLC/MAC layer data synchronization is the same as the MAC layer PDU, and is implemented by using a packet forwarding manner, including: receiving, by the TP, the MAC layer PDU sent by the primary TP.
  • the PDCP layer data synchronization comprises: performing, by the TP, the PDCP layer synchronization with the primary TP, and then performing RLC/MAC layer data synchronization.
  • the slave TP performs RLC/MAC layer data synchronization according to the signaling of the primary TP.
  • the PDCP layer data synchronization includes at least one of: the primary TP instructing a node to send a data packet to the secondary TP; the primary TP instructing the secondary TP to receive data from a node; the primary TP Instructing the slave TP to send a data request to the node, and the slave TP sends a data transmission request to the node, and the node sends data to the slave TP.
  • the slave TP when the slave TP receives data from the node according to the primary TP indication, the slave TP receives a data packet according to the identifier information of the data packet sent by the master TP; when the slave TP is configured according to the The master TP indicates that when the data transmission request is sent to the node, the slave TP sends the identifier information of the data packet to the node.
  • the identifier information of the data packet includes at least one of the following: a virtual cell identifier, a connection identifier, and a user equipment identifier.
  • the node is a gateway or a TP.
  • the TP includes at least one of the following: a macro base station, a small base station, an RRH, and a micro base station.
  • a data synchronization processing apparatus located in a slave transmission point TP, comprising: a receiving module configured to receive signaling and/or forwarding packets sent by a primary TP; and a second synchronization module, setting Performing downlink data synchronization with the primary TP by receiving signaling and/or forwarding packets, wherein M slave TPs and the master TP perform data synchronization in the packet data convergence protocol PDCP layer, and N slave TPs and master TPs in PDCP /Wireless Link Control RLC/Media Access Control
  • signaling and/or forwarding packets are sent to the M+N slave TPs; downlink data synchronization is performed with the slave TP by sending signaling and/or forwarding packets, wherein there are M slave TPs and masters.
  • FIG. 1 is a schematic diagram of a virtual cell in the related art
  • FIG. 2 is a schematic diagram of a user plane protocol stack in the related art
  • 3 is a schematic diagram of relationship between SDUs and PDUs in related art
  • FIG. 4 is a flowchart of a first method of data synchronization processing according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a second method of data synchronization processing according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a data synchronization processing apparatus 1 according to an embodiment of the present invention.
  • FIG. 7 is a structural block diagram of a data synchronization processing apparatus 2 according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a transmission point acquiring virtual cell data through a wired backhaul according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a method for allocating a data packet number according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a transmission point obtaining data of a virtual cell by a PDCP layer packet forwarding manner according to an embodiment of the present invention
  • FIG. 11 is a schematic diagram of a transmission point acquiring virtual cell data through a wired backhaul and performing data synchronization using PDCP/RLC/MAC synchronization information according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of a transmission point obtaining data of a virtual cell by a MAC layer packet forwarding manner according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a data synchronization processing method according to an embodiment of the present invention. As shown in FIG. 4, the flow includes the following steps:
  • Step S402 the primary transmission point TP sends signaling and/or forwarding packets to the M+N secondary TPs;
  • Step S404 Perform downlink data synchronization with the slave TP by sending signaling and/or forwarding packets, where M slave TPs and the master TP perform data synchronization in the packet data convergence protocol PDCP layer, and N slave TPs and master TPs in PDCP /Wireless Link Control RLC/Media Access Control
  • M slave TPs and the master TP perform data synchronization in the packet data convergence protocol PDCP layer, and N slave TPs and master TPs control PDLC/radio link RLC/
  • the media access control MAC layer performs data synchronization, and can determine the level of data synchronization according to the interference problem of the network, and solves the problem of controlling the overhead of data synchronization under the premise of ensuring the effect of cell virtualization in the related technology, thereby achieving the According to the requirements of cell virtualization, the number of layers for data synchronization is flexibly adjusted and controlled, and the data synchronization overhead is controlled on the premise of ensuring the effect of cell virtualization.
  • FIG. 5 is a flowchart of a second method of data synchronization processing according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps:
  • Step S502 receiving signaling and/or forwarding packets sent by the primary TP from the transmission point TP;
  • Step S504 Perform downlink data synchronization with the primary TP by receiving signaling and/or forwarding packets, where M slave TPs and the primary TP perform data synchronization in the packet data convergence protocol PDCP layer, and N slave TPs and master TPs in PDCP /Wireless Link Control RLC/Media Access Control
  • M slave TPs and the master TP perform data synchronization in the packet data convergence protocol PDCP layer, and N slave TPs and master TPs control PDLC/radio link RLC/
  • the media access control MAC layer performs data synchronization, and can determine the level of data synchronization according to the interference problem of the network, and solves the problem that the related technology has a large overhead when performing data synchronization, thereby achieving an overhead of effectively reducing data synchronization. Effect.
  • a data synchronization processing device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
  • the term “module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 6 is a structural block diagram of a data synchronization processing apparatus 1 according to an embodiment of the present invention. As shown in FIG. 6, the apparatus is located in a primary transmission point TP, and includes: a sending module 62 and a first synchronization module 64. Be explained.
  • the sending module 62 is configured to send signaling and/or forward packets to the M+N slave TPs; the first synchronization module 64 is connected to the sending module 62, and is configured to perform signaling and/or forwarding of packets and from the TP.
  • FIG. 7 is a structural block diagram of a data synchronization processing apparatus 2 according to an embodiment of the present invention. As shown in FIG. 7, the apparatus is located in a slave transmission point TP, and includes: a receiving module 72 and a second synchronization module 74. Be explained.
  • the receiving module 72 is configured to receive the signaling and/or forwarding packets sent by the primary TP.
  • the second synchronization module 74 is connected to the receiving module 72, and is configured to perform downlink data synchronization with the primary TP by receiving signaling and/or forwarding packets.
  • M slave TPs and the master TP in the packet data convergence protocol PDCP layer for data synchronization
  • a scheme for data synchronization between TPs in a cell virtualization process provided by the above embodiments and preferred embodiments.
  • the number of layers for data synchronization can be flexibly adjusted and controlled, and the cost and complexity of data synchronization can be controlled under the premise of ensuring the effect of cell virtualization.
  • the main transfer point is combined with the transfer point.
  • the method includes: M+N+1 TPs own downlink data of the terminal, and perform downlink data synchronization. These include 1 Master TP and M+N slave TP.
  • M+N+1 TPs own downlink data of the terminal, and perform downlink data synchronization.
  • These include 1 Master TP and M+N slave TP.
  • M slave TPs and master TPs in the PDCP layer for data synchronization
  • the PDCP layer data synchronization means that the slave TP is the same as the PDCP layer PDU of the master TP.
  • the data synchronization of the PDCP layer may include multiple types.
  • PDCP layer data synchronization may be implemented by means of packet forwarding, including: the master TP sends the PDCP layer PDU to the slave TP.
  • PDCP layer data The synchronization can also be implemented by using a signaling method, including: the master TP sends the PDCP layer data synchronization information to the slave TP, and the slave TP encapsulates the PDCP layer SDU according to the data synchronization information to form a PDCP layer PDU.
  • the PDCP layer data synchronization information includes, but is not limited to, at least one of the following: header compression information, encryption information, PDCP layer header, PDCP packet sequence number, superframe number, and maximum packet sequence number.
  • the PDCP/RLC/MAC layer data synchronization means that the slave TP is the same as the PDCP, RLC, and MAC layer PDUs of the master TP; or the MAC layer PDUs are the same.
  • the PDCP/RLC/MAC layer data synchronization can also be performed in various manners.
  • the PDCP/RLC/MAC layer data synchronization is the same as the PDCP, the RLC, and the MAC layer PDU, and can be implemented by using a signaling method, including: the master TP will be the PDCP layer.
  • the RLC layer and the data synchronization information of the MAC layer data are sent to the slave TP.
  • the slave TP encapsulates the PDCP layer, the RLC layer, and the MAC layer SDU according to the PDCP layer, the RLC layer, and the MAC layer data synchronization information to form a PDCP layer, an RLC layer, and a MAC layer PDU.
  • the PDCP/RLC/MAC layer data synchronization is the same for the PDCP, RLC, and MAC layer PDUs, and can also be implemented by signaling plus packet forwarding, including: the master TP transmits the PDCP layer PDU to the slave TP, and the RLC/MAC layer
  • the data synchronization information is sent to the slave TP, and the slave TP forms the RLC and MAC layer PDU according to the data synchronization information; or the master TP sends the PDCP layer SDU to the slave TP, and sends the data synchronization information of the PDCP/RLC/MAC layer to the slave TP.
  • the slave TP forms PDCP, RLC, and MAC layer PDUs based on the data synchronization information.
  • the PDCP layer data synchronization information includes, but is not limited to, at least one of the following: header compression information, encryption information, PDCP layer header, PDCP packet sequence number, superframe number, and maximum packet sequence number.
  • the RLC data synchronization information includes but is not limited to at least one of the following: an RLC transmission buffer status, an RLC layer PDU header;
  • the MAC layer data synchronization information includes but is not limited to at least one of the following: scheduling and resource allocation information (such as time and frequency of resources, modulation and coding mode used, redundancy version information, etc., process sequence number, precoding information), MAC layer The header of the MAC layer (MAC control element); the correspondence between the sub-packet header in the MAC layer header and the sequence number of the MAC SDU (or RLC PDU).
  • scheduling and resource allocation information such as time and frequency of resources, modulation and coding mode used, redundancy version information, etc., process sequence number, precoding information
  • MAC layer The header of the MAC layer (MAC control element); the correspondence between the sub-packet header in the MAC layer header and the sequence number of the MAC SDU (or RLC PDU).
  • the PDCP/RLC/MAC layer data synchronization is the same for the MAC layer PDU, and is implemented by the packet forwarding mode, including the master TP sending the MAC layer PDU to the slave TP.
  • PDCP/RLC/MAC layer data synchronization includes: Slave TP and master TP perform PDCP layer synchronization first, and then perform RLC/MAC layer data synchronization.
  • the master TP after performing PDCP layer synchronization, notifies the slave TP to perform RLC/MAC layer data synchronization.
  • TP includes but is not limited to: eNB, pico, RRH, femto.
  • the data transmission manner of the synchronization between the primary TP and the secondary TP may also be performed in various manners.
  • the master TP may instruct the node to send the data packet to the slave TP; or the master TP instructs the slave TP to receive the data from the node.
  • the master TP instructs the slave TP to send a data request to the node, the slave TP sends a data transmission request to the node, and the node sends data to the slave TP.
  • the identifier information of the slave TP is sent to the node, where the slave TP detects whether the data packet from the node contains the identification information corresponding to itself; when the master TP When the slave TP receives the data from the node, the related identifier information of the data packet is sent to the slave TP, where the “related identifier information of the data packet” is at least one of the following: a virtual cell identifier, a connection identifier, and a terminal identifier; The master TP indicates the slave TP.
  • the slave TP When the slave TP sends a data transmission request to the node, the slave TP sends the identifier information related to the applied data packet to the node, where the “packet-related identification information” is at least one of the following: Virtual cell identifier, connection identifier, and terminal identifier.
  • nodes are gateways or transmission points.
  • the data synchronization scheme is described based on the primary TP for data synchronization.
  • the master TP synchronizes the downlink data with the PDCP layer by using the signaling and/or packet forwarding mode.
  • PDCP layer data synchronization means that the slave TP is the same as the PDU of the PDCP layer of the master TP.
  • the PDCP layer data synchronization can be implemented in various manners, for example, by means of packet forwarding, including: the master TP sends the PDCP layer PDU to the slave TP; for example, the PDCP layer data synchronization can also be adopted.
  • the signaling mode is implemented, and the method includes: the master TP sends the PDCP layer data synchronization information to the slave TP.
  • the PDCP layer data synchronization information includes, but is not limited to, at least one of the following: header compression information, encryption information, PDCP layer header, PDCP packet sequence number, superframe number, and maximum packet sequence number.
  • the PDCP/RLC/MAC layer data synchronization means that the slave TP is the same as the PDCP, RLC, and MAC layer PDUs of the master TP; or the MAC layer PDUs are the same.
  • the PDCP/RLC/MAC layer data synchronization can also be performed in various ways, as exemplified below.
  • the PDCP/RLC/MAC layer data synchronization is the same for the PDCP, the RLC, and the MAC layer PDU, and is implemented by using a signaling method, including: the master TP sends the PDCP layer, the RLC layer, and the MAC layer data synchronization information to the slave TP.
  • the PDCP/RLC/MAC layer data synchronization is the same as the PDCP, the RLC, and the MAC layer PDU, and is implemented by signaling and packet forwarding, including: the master TP transmits the PDCP layer PDU to the slave TP, and the RLC/MAC layer The data synchronization information is sent to the slave TP; or the master TP sends the PDCP layer SDU to the slave TP, and sends the PDCP/RLC/MAC layer data synchronization information to the slave TP.
  • the PDCP layer data synchronization information includes, but is not limited to, at least one of the following: header compression information, encryption information, PDCP layer header, PDCP packet sequence number, superframe number, and maximum packet sequence number.
  • the RLC data synchronization information includes, but is not limited to, at least one of the following: an RLC transmission buffer status, an RLC layer PDU header.
  • the MAC layer data synchronization information includes but is not limited to at least one of the following: scheduling and resource allocation information (such as time and frequency of resources, modulation and coding mode used, redundancy version information, etc., process sequence number, precoding information), MAC layer The header of the MAC layer (MAC control element); the correspondence between the sub-packet header in the MAC layer header and the sequence number of the MAC SDU (or RLC PDU).
  • scheduling and resource allocation information such as time and frequency of resources, modulation and coding mode used, redundancy version information, etc., process sequence number, precoding information
  • MAC layer The header of the MAC layer (MAC control element); the correspondence between the sub-packet header in the MAC layer header and the sequence number of the MAC SDU (or RLC PDU).
  • the PDCP/RLC/MAC layer data synchronization is the same for the MAC layer PDU, and is implemented by the packet forwarding mode, including the master TP sending the MAC layer PDU to the slave TP.
  • the PDCP/RLC/MAC layer data synchronization specifically includes the Slave TP and the master TP performing PDCP layer synchronization first, and then performing RLC/MAC layer data synchronization.
  • the master TP After performing PDCP layer synchronization, the master TP notifies the slave TP to perform RLC/MAC layer data synchronization.
  • TP includes but is not limited to: eNB, pico, RRH, femto.
  • the master TP instructs the node to transmit the data of the terminal to other slave TPs; or the master TP instructs the slave TP to receive data from the node; or the master TP instructs the slave TP to send a data request to the node.
  • the master TP When the master TP instructs the node to send the data of the terminal to the other slave TP, the master TP sends the identity information of the slave TP to the node; when the master TP instructs the slave TP to receive the data from the node, the master TP identifies the identifier of the data packet. Sent to the slave TP.
  • the foregoing “identical identifier information of the data packet” may be at least one of the following: a virtual cell identifier, a connection identifier, and a terminal identifier.
  • the node is a gateway or a transmission point.
  • the data synchronization scheme is described based on a slave TP for data synchronization.
  • the M+N slave TP synchronizes with the master TP downlink data by receiving the signaling sent by the master TP and/or the packet forwarded by the master TP.
  • the M slave TPs and the master TP implement PDCP layer data synchronization
  • the N slave TPs and the master TP implement PDCP/RLC/MAC layer data synchronization.
  • the PDCP layer data synchronization means that the slave TP is the same as the PDU of the PDCP layer of the master TP.
  • the PDCP layer data synchronization can be implemented in various manners.
  • the PDCP layer data synchronization is implemented by means of packet forwarding, including: the slave TP receives the PDCP layer PDU sent by the master TP; and, for example, the PDCP layer data synchronization pass signal
  • the method is implemented, and the method includes: the slave TP receives the signaling related to the data synchronization information sent by the master TP, and encapsulates the PDCP layer SDU according to the data synchronization information to form a PDCP layer PDU.
  • the PDCP layer data synchronization information includes but is not limited to at least one of the following: header compression information, encryption information, PDCP layer header, PDCP packet sequence number, superframe number, maximum packet sequence number;
  • PDCP/RLC/MAC layer data synchronization refers to slave TP The same as the PDU of the PDTP, RLC, and MAC layer of the master TP; or the same PDU of the MAC layer;
  • the data synchronization of the PDCP/RLC/MAC layer is the same as that of the PDCP, the RLC, and the MAC layer, and is implemented by signaling, including: slave TP
  • the PDCP layer, the RLC layer, and the MAC layer data synchronization information sent by the master TP are received, and the PDCP layer, the RLC layer, and the MAC layer PDU are formed according to the data synchronization information.
  • the PDCP/RLC/MAC layer data synchronization is the same for the PDCP, the RLC, and the MAC layer PDU, and can be implemented by signaling and packet forwarding, including: the slave TP receives the PDCP layer PDU sent by the master TP and the data synchronization information of the RLC/MAC layer. And forming RLC and MAC layer PDUs according to the data synchronization information. Or, the slave TP receives the data synchronization information of the PDCP layer SDU and the PDCP/RLC/MAC layer sent by the master TP, and forms PDCP, RLC, and MAC layer PDU according to the data synchronization information.
  • the PDCP layer data synchronization information includes but is not limited to at least one of the following: header compression information, encryption information, PDCP layer header, PDCP packet sequence number, superframe number, and maximum packet sequence number; and the RLC data synchronization information includes but is not limited to the following at least One: RLC transmission buffer status, RLC layer PDU header; MAC layer data synchronization information Including but not limited to at least one of the following: scheduling and resource allocation information (such as time and frequency of resources, modulation and coding mode used, redundancy version information, etc., process sequence number, precoding information), MAC layer header; MAC layer control Element (MAC CE, MAC control element); correspondence between the sub-packet header in the MAC layer header and the sequence number of the MAC SDU (or RLC PDU)
  • the PDCP/RLC/MAC layer data synchronization is the same as the MAC layer PDU, and is implemented by using a packet forwarding manner, and specifically includes the slave TP receiving the MAC layer PDU sent by the master TP.
  • the PDCP/RLC/MAC layer data synchronization specifically includes the Slave TP first master TP for PDCP layer synchronization, and then RLC/MAC layer data synchronization.
  • the slave TP performs RLC/MAC layer data synchronization according to the signaling of the master TP.
  • the foregoing TP includes but is not limited to: eNB, pico, RRH, femto.
  • the slave TP detects whether the data packet from the node contains the identification information corresponding to itself; or the slave TP receives the data from the node according to the master TP indication; or the slave TP According to the master TP indication, a data transmission request is made to the node, and the data sent by the node is received.
  • the slave TP receives the data from the node according to the master TP indication, and the slave TP receives the data packet according to the identifier information of the data packet sent by the master TP, and the “related identifier information of the data packet” is at least one of the following: the virtual cell identifier. , connection identifier, terminal identifier;
  • the slave TP When the slave TP proposes a data transmission request to the node according to the master TP indication, the slave TP sends the identifier information related to the data packet to the node.
  • the “data packet-related identification information” is at least one of the following: a virtual cell identifier, a connection identifier, and a terminal identifier.
  • the node is a gateway or a transmission point.
  • the data synchronization method of the transmission point can be flexibly selected according to the problem faced by the virtual cell, and a good compromise between performance and overhead and synchronization complexity is achieved.
  • the virtual cell mainly solves the mobility problem of the terminal.
  • the transmission point of the virtual cell only needs to implement data synchronization in the PDCP layer. Therefore, while solving the mobility problem, the overhead caused by the RLC/MAC layer synchronization is reduced.
  • the virtual cell needs to solve the interference problem.
  • the transmission point of the virtual cell needs to be synchronized at the PDCP/RLC/MAC layer, so that the joint processing of signals is realized between the transmission points, and a better interference suppression effect is achieved.
  • the number of transmission points required to perform PDCP layer data synchronization to solve the mobility problem may be different from the number of transmission points required to perform PDCP/RLC/MAC layer data synchronization to solve the interference problem.
  • Some nodes can implement data synchronization only in the PDCP layer, and some nodes can implement data synchronization or directly perform MAC layer data synchronization on the RLC/MAC layer on the basis of PDCP layer synchronization according to needs (such as interference suppression requirements).
  • the nodes that implement the MAC layer data synchronization can be used for signal joint processing to solve the interference problem, and the transmission point of the PDCP layer data synchronization can be used to solve the mobility problem. Reduce overhead while addressing mobility/interference issues.
  • the data method can be selected according to the characteristics of the transmission point: when the transmission point can directly obtain the user data from the gateway, the data synchronization method based on the signaling can be selected.
  • This approach reduces the overhead of forwarding packets directly from the master TP.
  • the master TP may select to forward the data packet to implement data synchronization.
  • the above method simultaneously implements RLC and MAC layer data synchronization.
  • the RLC layer can ensure data encapsulation according to the scheduling and resource allocation of the MAC layer, thereby improving the working efficiency of the system.
  • the above method also reduces the amount of data between transmission points, thereby reducing the use of inter-transport point link (forward link) resources. Therefore, when the current transmission link and the access link (the link between the transmission point and the terminal) share the frequency resource, the interference between the forward transmission link and the access link can also be reduced.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the following is an example of a method for obtaining a data packet from a gateway (or gateway) in a virtual cell:
  • FIG. 8 is a schematic diagram of a transmission point acquiring virtual cell data through a wired backhaul according to an embodiment of the present invention.
  • the transmission point is TP0/TP1/TP2 (as shown in FIG. 8-(A) and FIG. 8-(B). Show) or the transmission point TP0/TP1/TP2/TP3/TP4 (as shown in Figure 8-(C), Figure 8-(D)) constitutes the virtual cell of the terminal, and obtains the gateway from the gateway via the wired backhaul (GW, Gate way) ), where TP0 is the master TP and data is available through the gateway.
  • GW Gate way
  • the packets from the gateway are on the "rings" of the various TPs.
  • TP0 transmits the received information of the packet from the gateway to the TP1/TP2 through the interface between the TPs, so that TP1/TP2 Data belonging to the virtual cell can be identified and received.
  • the interface between the TPs can be achieved by wireless backhaul (wireless backhaul) or wired backhaul (wired backhaul) connecting each TP.
  • the received information of the data packet includes, but is not limited to, address information or identification information of the data packet. Each TP uses this information to identify whether the data packet belongs to a terminal served by the virtual cell.
  • each TP acquires data to the gateway separately.
  • the TP0 sends the identification information of the TP1/TP2 (such as the address information or the identifier of the TP) to the gateway, and then the gateway sends the data packet corresponding to the virtual cell to the TP0/TP1/TP2.
  • the gateway sends the data of the virtual cell to TP1/TP2.
  • data can be obtained through nodes connected to the gateway.
  • TP0 can notify TP2 to send data to TP3/TP4.
  • the identification information of the data packet can be sent to TP3/TP4 by TP0.
  • TP3/TP4 receives data packets through an environmental network connected to TP2.
  • the following is an example of a method in which a transmission point implements PDCP layer data synchronization through signaling in a wireless backhaul.
  • the TP0 sends configuration information for data synchronization of the PDCP layer to other TPs in the virtual cell by means of broadcast signaling or terminal-specific signaling.
  • the configuration information includes (using the user plane PDCP Data PDU as an example): PDCP layer header compression configuration information (such as the header compression algorithm used), encryption/decryption configuration information (such as a key), and serial number of the PDCP layer packet ( SN) Length, information about the synchronization of the packet sequence number (see description in the serial number synchronization method).
  • TP1/TP2 (or TP1/TP2/TP3/TP4) encrypts the data packet, performs header compression, and adds a PDU header according to the information to form a PDCP PDU.
  • TP0 compresses the configuration information and encryption/decryption configuration information of the packet header.
  • the PDCP PDU packet is sent to TP1/TP2 (or TP1/TP2/TP3/TP4). After TP1/TP2 (or TP1/TP2/TP3/TP4) encrypts the PDCP SDU and compresses the header, it directly adds the packet header to form a PDCP PDU.
  • the transmission point performs packet loss processing to control the TCP layer (Transport Control Protocol) data rate. This is usually done using the packet loss timer (DiscardTimer). That is, when each packet arrives, an initial value is set for the DiscardTimer of this packet. The DiscardTimer is decremented over time. When it is reduced to 0, the transit node discards the corresponding packet.
  • DiscardTimer packet loss timer
  • FIG. 9 is a schematic diagram of a method for allocating a data packet number according to an embodiment of the present invention.
  • each arriving data packet corresponds to a tag on a time axis.
  • the packet loss timer is based on The tags of each package start timing. For example, the packet loss timer of the first packet of TP1/TP2 starts at the position of tag1.
  • the synchronization method of the serial number includes: (1) TP0 indicates the serial number of a data packet, and all TPs assign the serial number to the PDCP layer PDU formed by the data packet. After that, the serial number is automatically incremented after each packet is received. (2) Each arriving packet corresponds to an identifier on a time axis, and the identifier on each time axis corresponds to a serial number.
  • the packet 0 of TP0 and TP1 arrives at time t0 and t1, respectively, corresponding to tag0, and the sequence number 0 is assigned.
  • the packet 1 of TP0 arrives at time t2, and corresponds to tag1, and the sequence number 1 is assigned.
  • the packet 1 of TP1 arrives at time t3 and corresponds to tag2. However, since there is no data packet between tag1 and tag2, packet 1 of TP1 corresponds to tag2, and sequence number 1 is assigned.
  • the following example illustrates how a virtual cell formed by a transmission point that implements PDCP layer data synchronization solves mobility problems.
  • TP0/TP1/TP2 achieves data synchronization at the PDCP layer, PDU0/1/2/3/4.... It's exactly the same.
  • TP0 provides data service for the terminal, PDCP PDU0/1 has been completely transmitted, and PDCP PDU2 is being transmitted.
  • TP0 resets its own RLC/MAC layer, and indicates the RLC/MAC layer reset of the terminal (including RLC/MAC layer parameter reset, and discards the data packet located in the RLC/MAC layer and PDCP PDU2) .
  • TP0 instructs TP1 to continue transmitting PDCP PDU2.
  • TP1 encapsulates PDCP PDU2 according to its own RLC/MAC configuration parameters and starts transmitting data to the terminal.
  • TP0 can also notify TP1 to become the new master TP at this time.
  • FIG. 10 is a schematic diagram of a transmission point obtaining data of a virtual cell by using a PDCP layer packet forwarding manner according to an embodiment of the present invention.
  • a transmission point TP0/TP1/TP2 (as shown in FIG. 10) constitutes a virtual cell of a terminal.
  • T0 is the master TP, and the data from the gateway (GW, Gate way) is obtained through the wired backhaul (TP1/TP2 can be connected to the gateway via wired backhaul or not connected to the gateway).
  • TP0 encapsulates data from the gateway at the PDCP layer to form a PDCP layer PDU.
  • TP0 uses the wireless backhaul to send the PDCP layer PDU to TP1/TP2 to implement data synchronization between TP0/TP1/TP2.
  • TP0 can use the broadcast mode to forward data packets, or unicast to send data packets to TP1/TP2.
  • TP0/TP1/TP2 achieves data synchronization at the PDCP layer, PDCP PDU0/1/2/3/4.... It's exactly the same.
  • the signal of TP0 is strong, The data service is provided by the TP0 for the terminal.
  • the PDCP PDU0/1 has been completely transmitted and the PDCP PDU2 is being transmitted.
  • TP0 resets its own RLC/MAC layer and instructs the terminal RLC/MAC layer to reset. That is, the RLC/MAC layer parameters are reset, and the data packets related to the PDCP PDU2 located at the RLC/MAC layer are discarded.
  • TP0 instructs TP1 to continue transmitting PDCP PDU2.
  • TP1 encapsulates PDCP PDU2 according to its own RLC/MAC configuration parameters and starts transmitting data to the terminal.
  • TP0 can also notify TP1 to become the new master TP at this time.
  • the RLC/MAC layer reset causes the data packet being transmitted by the RLC/MAC layer to be discarded, and the problem of retransmission at TP1 is required. This problem can cause waste of resources and increase the delay of packet transmission. At higher data rates, this issue can severely impact system performance.
  • Figure 10-(B) Another possible scheme is shown in Figure 10-(B). After TP0 transmits PDCP PDU2, it performs RLC/MAC layer reset. During the transmission of PDCP PDU2, the terminal can establish a connection with TP1 and establish a new RLC/MAC entity to start transmitting PDCP PDU3.
  • FIG. 11 is a schematic diagram of a transmission point acquiring data of a virtual cell through a wired backhaul and data synchronization using PDCP/RLC/MAC synchronization information according to an embodiment of the present invention.
  • a transmission point TP0/TP1/TP2 constitutes a virtual terminal.
  • the cell and the data from the gateway are obtained through the wired backhaul (taking the ring network structure as an example, other network structures and methods for obtaining the gateway data are as in the first embodiment), where TP0 is the master TP.
  • the following describes two methods for implementing PDCP/RLC/MAC data synchronization.
  • Method 1 Each TP implements PDCP/RLC/MAC layer synchronization at the same time, as shown in Figure 11-(A).
  • TP0 sends the data synchronization information of the PDCP/RLC/MAC layer together to TP1 and TP2 in the virtual cell (either by broadcast or separately to TP1/TP2). Based on this information, TP1/TP2 completes data synchronization with TP0 at the corresponding layer.
  • the specific method is as follows:
  • the information of the RLC layer includes (in the UM mode as an example): the state of the transmission buffer; the header of the RLC PDU.
  • TP1/TP2 updates its own transmit buffer based on the TP0 transmit buffer status.
  • TP1/TP2 extracts the RLC SDUs from the respective transmit buffers according to the data synchronization information indicated by the RLC PDU header of TP0, segments/cascades the RLC SDUs, adds a header, and encapsulates them into RLC PDUs.
  • the MAC layer information includes:
  • scheduling and resource allocation information such as resource time and frequency location, modulation coding mode used, redundancy version information, etc., process sequence number, precoding information
  • MAC layer header MAC layer control element (MAC control element)
  • MAC control element MAC control element
  • scheduling and resource allocation information (such as time and frequency location of resources, modulation and coding scheme used, redundancy version information, etc., process sequence number, precoding information).
  • Method 2 TP1 and TP0 implement PDCP layer synchronization, and TP2 and TP0 implement PDCP/RLC/MAC layer synchronization, as shown in Figure 11-(B).
  • TP0 sends the data synchronization information of the PDCP layer to TP1 and TP2, and sends the RLC/MAC layer data synchronization information to TP2.
  • TP1 and TP0 implement PDCP layer synchronization
  • TP2 and TP0 implement PDCP/RLC/MAC layer synchronization.
  • the terminal moves from a position closer to TP0/TP2 toward a position closer to TP1/TP2.
  • TP0/TP1/TP2 achieves data synchronization at the PDCP/RLC/MAC layer.
  • Joint Processing includes: Joint Transmission (JT), that is, TP0 and TP2 transmit the same MAC layer data, and the physical signal is coherently superimposed or non-coherent at the terminal. Superimposed to increase the strength of the received signal to counter the interference; or Dynamic Point Selection (DPS) dynamically selects the transmission point with the best signal quality between TP0 and TP2 for the terminal service.
  • JT Joint Transmission
  • DPS Dynamic Point Selection
  • TP0 indicates that TP1/TP2 uses signal joint processing to provide services for the terminal.
  • the terminal moves from a position closer to TP0/TP2 toward a position closer to TP1/TP2.
  • TP0/TP2 achieves data synchronization at the PDCP/RLC/MAC layer;
  • TP0/TP1 achieves data synchronization at the PDCP layer.
  • the terminal When it is closer to TP0/TP2, the terminal provides data transmission service by TP0/TP1, and solves the interference problem through joint signal processing.
  • TP0 When the terminal moves to a location closer to TP1/TP2, if TP1 is selected to continue to provide services for the terminal, TP0 resets its own RLC/MAC layer and instructs the terminal to reset the RLC/MAC layer (including the RLC/MAC layer parameter reset, And discard the data packets that are being transmitted at the RLC/MAC layer).
  • TP0 indication TP1 continues to transmit PDCP PDUs corresponding to the dropped packets of the RLC/MAC layer.
  • TP1 encapsulates the corresponding PDCP PDU according to its own RLC/MAC configuration parameters and starts transmitting data to the terminal.
  • TP0 keeps connecting with the terminal while instructing TP1 to provide services for the terminal, and continues to transmit data packets that are not sent by the RLC/MAC layer (at this time, TP0/TP1 provides services for the terminal at
  • FIG. 12 is a schematic diagram of a transmission point obtaining data of a virtual cell by using a MAC layer packet forwarding manner according to an embodiment of the present invention.
  • a transmission point TP0/TP1/TP2 (shown in FIG. 12) constitutes a terminal.
  • Virtual cell. T0 is the master TP, and the data from the gateway (GW, Gate way) is obtained through the wired backhaul (TP1/TP2 can be connected to the gateway via wired backhaul or not connected to the gateway).
  • TP0 encapsulates data from the gateway at the PDCP/RLC/MAC layer to form a MAC layer PDU.
  • TP0 uses the wireless backhaul to send MAC layer PDUs and scheduling and resource allocation information to TP1/TP2 to implement data synchronization between TP0/TP1/TP2.
  • TP0 can use the broadcast mode to forward data packets, or unicast to send data packets to TP1/TP2.
  • the following example shows how to solve the interference and mobility problems by the data synchronization method given in this example.
  • the terminal moves closer to TP1 at a position closer to TP0.
  • TP0 send data and related scheduling, resource allocation information
  • MAC PDU0 has been correctly received
  • MAC PDU1 is being retransmitted.
  • TP0 indicates that TP1 serves the terminal, and TP1 continues to transmit the retransmission packet of MAC PDU1.
  • resource allocation and scheduling information may be sent by the TP0 to the terminal or may be sent by the TP1 to the terminal.
  • the terminal moves closer to TP1 at a position closer to TP0.
  • TP0 send data and related scheduling, resource allocation information
  • MAC PDU0 has been correctly received
  • MAC PDU1 is being retransmitted.
  • TP0 instructs TP1 to provide services for the terminal.
  • TP0/TP1 uses the signal joint transmission method to simultaneously provide services for the terminal, and continues to transmit the retransmission packet of the MAC PDU1.
  • the transmission point TP0/TP1/TP2 constitutes a virtual cell of the terminal.
  • T0 is the master TP, and the data from the gateway (GW, Gate way) is obtained through the wired backhaul (TP1/TP2 can be connected to the gateway via wired backhaul or not connected to the gateway).
  • TP0 encapsulates data from the gateway (including operations such as encryption) at the PDCP layer to form a PDCP layer PDU.
  • the TP0 sends the PDCP layer PDU to the TP1/TP2 by using the wireless backhaul, and sends the RLC/MAC layer data synchronization information to the TP2.
  • TP2 according to RLC/MAC layer data synchronization information to PDCP
  • the PDU is encapsulated to obtain an RLC/MAC layer PDU. (For the RLC/MAC data synchronization information and synchronization method, see Embodiment 3)
  • TP0/TP1 can implement PDCP layer data synchronization
  • TP0/TP2 can implement PDCP/RLC/MAC layer data synchronization. See Example 3 for solutions to mobility and interference problems.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the foregoing embodiments and preferred embodiments solve the problem of controlling the cost of data synchronization under the premise of ensuring the effect of cell virtualization in the related art, thereby achieving flexibility according to the requirements of cell virtualization. Adjust and control the number of layers for data synchronization, and control the data synchronization overhead and the complexity of the implementation under the premise of ensuring the effect of cell virtualization.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明公开了一种数据同步处理方法及装置，其中，该方法包括：向M+N个从TP发送信令和/或转发包；于通过发送信令和/或转发包与从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1，通过本发明，解决了相关技术中，如何在保证小区虚拟化效果的前提下，控制数据同步的开销的问题，进而达到了可以根据小区虚拟化的需求，灵活地调整和控制实现数据同步的层数，在保证小区虚拟化效果的前提下，控制数据同步开销。

Description

数据同步处理方法及装置 技术领域
本发明涉及通信领域，具体而言，涉及一种数据同步处理方法及装置。
背景技术
移动通信的发展历史表明，小区分裂、更大的带宽、更高的频谱效率是系统容量提升的三大支柱。因此，“小区分裂”将是实现5G系统容量增长目标的关键。
4G系统通过异构网络(Heterogeneous Network，简称为HetNet)获得小区分裂增益。在HetNet网络中，低功率传输点(Transmission Point，简称为TP)被灵活的、稀疏的部署在宏小区基站(Macro Cell eNodeB或eNB)覆盖区域之内，形成了由宏小区和小小区(Small Cell)组成的多层网络。HetNet不仅可以在保证覆盖的同时提高小区分裂的灵活性及系统容量，分担宏小区的业务压力，还可以扩大宏小区的覆盖范围。在4G系统研究的末期，为了进一步提高系统容量，3GPP提出了Small Cell增强技术，对高密度部署small cell时出现的问题展开了初步的研究。
超密集网络(Ultra Dense Network，简称为UDN)正是在这一背景下提出的，它可以看作是Small Cell增强技术的进一步演进。在UDN网络中，TP密度将进一步提高，TP的覆盖范围进一步缩小(几十米，甚至十几米)，每个TP可能同时只服务一个或很少的几个用户。超密集部署拉近了TP与终端(或称为用户设备，即UE，User Equipment)的距离，使得他们的发射功率可以大大降低，且变得非常接近，上、下行链路的差别也因此越来越小。
移动性问题和干扰问题是UDN网络必须解决的两大技术难题。由于TP密度高、TP覆盖范围小，终端在运动过程中会在TP间频繁切换。频繁切换会对网络产生巨大信令压力，造成TCP/IP性能的恶化，严重影响用户的体验。另一方面，TP的高密度部署，也会使网络的干扰环境更加复杂，限制容量的进一步提升。
小区虚拟化是解决UDN网络移动性及干扰问题的关键技术。其核心是建立以用户为中心的虚拟小区，使得无论用户移动到什么位置，都感觉自己在小区的中心，始终得到高质量的数据通信服务。虚拟小区由用户周围的若干个TP组成。图1是相关技术中虚拟小区示意图，如图1所示，在用户移动或周围环境变化过程中，不断有新TP加入虚拟小区，旧TP从虚拟小区中脱离，使得虚拟小区随着用户的移动而移动或 随着周围环境的变化而变化，保证用户体验的一致性，这一过程称为小区的赋形(forming)或重赋形(reforming)。
在虚拟小区内，各个TP需要采用相同的用户数据的封装方式才能实现有效的虚拟化，即实现各TP的联合数据传输或在TP间灵活转换而不造成用户数据传输中断。各个TP对用户数据封装方式达成一致的过程称为数据同步。如何实现数据同步，是小区虚拟化技术急需解决的问题。
图2是相关技术中用户面协议栈示意图，如图2(左)所示，LTE(Long Term Evolution)的用户面协议栈由PDCP(Packet Data Convergence Protocol)层、RLC(Radio Link Control)层、MAC(Medium Access Control)层、PHY(Physical layer)层组成，其中PDCP层位于最上层，PHY层位于最下层。图3是相关技术中SDU/PDU关系示意图，如图3所示，在发送侧，上层传递给下层的数据包称为协议数据单元(PDU，Protocol Data Unit)，下层接收到的上层发送的数据包称为服务数据单元(SDU，Service Data Unit)。接收侧相反。此外，LTE还有控制面，其协议栈如图2(右)所示。
PDCP层主要负责进行IP包头压缩/解压缩(Header compression and decompression)、传递用户数据(Transfer of user data)、包的顺序收发(In-sequence delivery of upper layer PDUs)、重复包检测(Duplicate detection of lower layer SDUs)、包重传(Retransmission of PDCP SDUs)、加密/解密(Ciphering and deciphering)、基于定时器的包丢弃操作(Timer-based SDU discard)。PDCP层的PDU分为控制面PDCP Data PDU(承载控制面数据)、用户面PDCP Data PDU(承载用户面用户数据)、PDCP Control PDU(承载PDCP控制信息)。
RLC层负责传递由上层(即PDCP层)发送的数据包(Transfer of upper layer PDUs)、错误校正(Error Correction through ARQ)、分段/级联/重组(Concatenation，segmentation and reassembly of RLC SDUs)、重分段(Re-segmentation of RLC data PDUs)、排序(Reordering of RLC data PDUs)、重复包检测(Duplicate detection)、协议错误检测(Protocol error detection)、包丢弃(RLC SDU discard)、RLC层重建(RLC re-establishment)；MAC层负责逻辑信道和传输信道映射(Mapping between logical channels and transport channels)、MAC SDU的封装/解封装(Multiplexing/demultiplexing of MAC SDUs)、调度信息上报(scheduling information reporting)、利用HARQ进行错误校正(Error correction through HARQ)、UE逻辑信道优先级处理(Priority handling between logical channels of one UE)、UE间优先级处理(Priority handling between UEs)、传输类型选择(Transport format selection)等；PHY层负责调制/解调、编/译码、交织/解交织及物理信号处理等操作。
如图3所示，RLC层PDU由包头和数据(或只由数据)组成。包头用于指示RLC SDU长度、类型等信息。
如图3所示，MAC层PDU由MAC层包头(MAC header)和MAC层负荷(MAC payload)组成。MAC层负荷由MAC层控制单元MAC control element(MAC CE)、MAC层SDU组成、附加比特(padding bit，用于使MAC层PDU的长度满足特定需求)。MAC层包头包含多个子包头，与MAC CE，MAC SDU及padding bit对应，用于指示MAC层负荷中各个元素(MAC CE，MAC SDU或padding bit)的信息(长度，在MAC PDU中的相对位置、信息类型等)。MAC CE有多种类型，用于传输各种MAC层的控制信息，比如用于功率空间报告(Power Headroom Report)的MAC CE；缓存空间报告(Buffer Status Report)的MAC CE；用于发送定时提前命令(Timing Advance Command)的MAC CE。
完整的下行数据同步是指在不同TP间，从PDCP层到MAC层都实现同步，包括各层数据包的封装方式，各层状态变量的取值，计时器的状态等。也可以在一个TP进行从PDCP层到MAC层的数据封装，然后通过将MAC层数据包发送给其它TP的方式实现完整同步(即在各TP内，由于MAC层数据包完全相同，MAC层数据包所封装的PDCP层/RLC层数据也完全相同)。在完整数据同步的状态下，虚拟小区可以动态的选择为终端服务的TP，获得最好的虚拟化效果。另一方面，协议栈的每一层都需要在该层SDU的基础上增加额外的开销，形成PDU，来实现该层需要支持的功能。因此，虽然实现数据同步的层数越多，小区虚拟化的效果越好，但数据同步过程也会变得越复杂，用于数据同步的开销也越大。所以，如何在保证小区虚拟化效果的前提下，控制数据同步的开销，就是在设计数据同步过程时需要解决的问题。
发明内容
本发明提供了一种数据同步处理方法及装置，用于解决小区虚拟化过程中TP间数据同步问题。
根据本发明的一个方面，提供了一种数据同步处理方法，包括：主传输点TP向M+N个从TP发送信令和/或转发包；通过发送信令和/或转发包与所述从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
优选地，所述PDCP层数据同步为从TP与主TP的PDCP层的协议数据单元PDU相同。
优选地，通过以下方式至少之一进行所述PDCP层数据同步：数据包转发的方式，其中，所述数据包转发的方式包括：所述主TP将所述PDCP层的所述PDU发送给所述从TP；通过信令方式，其中，所述信令方式包括：所述主TP将所述PDCP层数据同步信息发送给所述从TP，所述数据同步信息用于所述从TP对PDCP层SDU封装，形成PDCP层PDU。
优选地，所述PDCP层数据同步信息包括以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
优选地，所述PDCP/RLC/MAC层数据同步为所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同；或MAC层的PDU相同。
优选地，通过以下方式至少之一进行所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同：通过信令的方式，其中，所述信令的方式包括：所述主TP将PDCP层，RLC层，MAC层数据的数据同步信息发送给所述从TP，所述PDCP层、RLC层、MAC层的所述数据同步信息用于所述从TP对PDCP层、RLC层、MAC层SDU封装，形成PDCP层、RLC层、MAC层PDU；通过信令加包转发的方式，其中，所述信令加包转发的方式包括：所述主TP将PDCP层PDU传输给所述从TP，并将RLC/MAC层的数据同步信息发送给所述从TP，所述数据同步信息用于所述从TP形成RLC及MAC层PDU；或所述主TP将PDCP层SDU发送给所述从TP，并将PDCP/RLC/MAC层的数据同步信息发送给所述从TP，所述数据同步信息用于所述从TP形成PDCP、RLC、MAC层PDU。
优选地，包括以下至少之一：所述PDCP层数据同步信息包括以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号；所述RLC数据同步信息包括以下至少之一：RLC发送缓冲器状态、RLC层PDU包头；所述MAC层数据同步信息包括以下至少之一：调度和资源分配信息、MAC层包头；MAC层控制元素；MAC层包头中的子包头与MAC SDU的序号的对应关系。
优选地，所述PDCP/RLC/MAC层数据同步为MAC层PDU相同，通过包转发方式实现，包括：所述主TP将MAC层PDU发送给所述从TP。
优选地，所述PDCP层数据同步包括：所述从TP与所述主TP先进行PDCP层同步，然后再进行RLC/MAC层数据同步。
优选地，在进行PDCP层同步后，由所述主TP通过信令通知所述从TP进行RLC/MAC层数据同步。
优选地，所述PDCP层数据同步包括以下至少之一：所述主TP指示节点将数据包发送给所述从TP；所述主TP指示所述从TP接收来自节点的数据；所述主TP指示所述从TP向节点发送数据请求，由所述从TP向节点提出数据发送请求，节点向所述从TP发送数据。
优选地，在所述主TP指示节点将数据包发送给所述从TP时，所述主TP将所述从TP的标识信息发送给节点；在所述主TP指示所述从TP接收来自节点的数据时，所述主TP将所述数据包的标识信息发送给所述从TP；在所述主TP指示所述从TP向节点发送数据请求，由所述从TP向节点提出数据发送请求，节点向所述从TP发送数据时，并由所述从TP将与所申请的数据包的标识信息发送给所述节点。
优选地，在所述主TP指示节点将数据包发送给所述从TP时，所述从TP检测来自所述节点的数据包是否含有与所述从TP对应的标识信息。
优选地，所述数据包的标识信息包括以下至少之一：虚拟小区标识、连接标识、用户设备标识。
优选地，所述节点为网关或TP。
优选地，所述TP包括以下至少之一：宏基站、小基站、RRH、微基站。
根据本发明的另一方面，提供了一种数据同步处理方法，包括：从传输点TP接收主TP发送的信令和/或转发包；通过接收信令和/或转发包与所述主TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
优选地，所述PDCP层数据同步为从TP与主TP的PDCP层的协议数据单元PDU相同。
优选地，通过以下方式至少之一进行所述PDCP层数据同步：数据包转发的方式，其中，所述数据包转发的方式包括：所述从TP接收所述主TP发送的所述PDCP层的所述PDU；通过信令方式，其中，所述信令方式包括：所述从TP接收所述主TP发送的所述PDCP层数据同步信息，所述从TP依据所述数据同步信息对PDCP层SDU封装，形成PDCP层PDU。
优选地，所述PDCP层数据同步信息包括以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
优选地，所述PDCP/RLC/MAC层数据同步为所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同；或MAC层的PDU相同。
优选地，通过以下方式至少之一进行所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同：通过信令的方式，其中，所述信令的方式包括：所述从TP接收所述主TP发送的PDCP层，RLC层，MAC层数据的数据同步信息，所述从TP依据所述PDCP层、RLC层、MAC层的所述数据同步信息对PDCP层、RLC层、MAC层SDU封装，形成PDCP层、RLC层、MAC层PDU；通过信令加包转发的方式，其中，所述信令加包转发的方式包括：所述从TP接收所述主TP传输的PDCP层PDU，及RLC/MAC层的数据同步信息，所述从TP根据所述数据同步信息所述从TP形成RLC及MAC层PDU；或所述从TP接收所述主TP发送的PDCP层SDU，以及PDCP/RLC/MAC层的数据同步信息，并依据所述数据同步信息形成PDCP、RLC、MAC层PDU。
优选地，包括以下至少之一：所述PDCP层数据同步信息包括以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号；所述RLC数据同步信息包括以下至少之一：RLC发送缓冲器状态、RLC层PDU包头；所述MAC层数据同步信息包括以下至少之一：调度和资源分配信息、MAC层包头；MAC层控制元素；MAC层包头中的子包头与MAC SDU的序号的对应关系。
优选地，所述PDCP/RLC/MAC层数据同步为MAC层PDU相同，通过包转发方式实现，包括：所述从TP接收所述主TP发送的MAC层PDU。
优选地，所述PDCP层数据同步包括：所述从TP与所述主TP先进行PDCP层同步，然后再进行RLC/MAC层数据同步。
优选地，在进行PDCP层同步后，所述从TP根据所述主TP的信令通知进行RLC/MAC层数据同步。
优选地，所述PDCP层数据同步包括以下至少之一：所述主TP指示节点将数据包发送给所述从TP；所述主TP指示所述从TP接收来自节点的数据；所述主TP指示所述从TP向节点发送数据请求，由所述从TP向节点提出数据发送请求，节点向所述从TP发送数据。
优选地，所述从TP检测到来自节点的数据包是否含有与自己对应的标识信息；所述从TP根据所述主TP的指示，接收来自节点的数据；所述从TP根据所述主TP指示，向节点提出数据发送请求，并接收节点发送的数据。
优选地，当所述从TP根据所述主TP指示，接收来自节点的数据时，所述从TP根据所述主TP发送的数据包的标识信息接收数据包；当所述从TP根据所述主TP指示，向节点提出数据发送请求时，所述从TP将数据包的标识信息发送给节点。
优选地，所述数据包的标识信息包括以下至少之一：虚拟小区标识、连接标识、用户设备标识。
优选地，所述节点为网关或TP。
优选地，所述TP包括以下至少之一：宏基站、小基站、RRH、微基站。
根据本发明的还一方面，提供了一种数据同步处理装置，位于主传输点TP中，包括：发送模块，设置为向M+N个从TP发送信令和/或转发包；第一同步模块，设置为通过发送信令和/或转发包与所述从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
根据本发明的再一方面，提供了一种数据同步处理装置，位于从传输点TP中，包括：接收模块，设置为接收主TP发送的信令和/或转发包；第二同步模块，设置为通过接收信令和/或转发包与所述主TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
通过本发明，采用向M+N个从TP发送信令和/或转发包；于通过发送信令和/或转发包与所述从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1，解决了相关技术中，如何保证小区虚拟化效果的前提下，控制数据同步的开销的问题，进而达到了可以根据小区虚拟化的需求，灵活地调整和控制实现数据同步的层数，在保证小区虚拟化效果的前提下，控制数据同步开销及实现复杂度的效果。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是相关技术中虚拟小区示意图；
图2是相关技术中用户面协议栈示意图；
图3是相关技术中SDU/PDU关系示意图；
图4是根据本发明实施例的数据同步处理方法一的流程图；
图5是根据本发明实施例的数据同步处理方法二的流程；
图6是根据本发明实施例的数据同步处理装置一的结构框图；
图7是根据本发明实施例的数据同步处理装置二的结构框图；
图8是根据本发明实施例的传输点通过有线backhaul获取虚拟小区数据的示意图；
图9是根据本发明实施例的数据包序号分配方法示意图；
图10是根据本发明实施例的传输点通过PDCP层包转发方式获得虚拟小区数据实现数据同步的示意图；
图11是根据本发明实施例的传输点通过有线backhaul获取虚拟小区数据，利用PDCP/RLC/MAC同步信息实现数据同步的示意图；
图12是根据本发明实施例的传输点通过MAC层包转发方式获得虚拟小区数据实现数据同步的示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
在本实施例中提供了一种数据同步处理方法，图4是根据本发明实施例的数据同步处理方法一的流程图，如图4所示，该流程包括如下步骤：
步骤S402，主传输点TP向M+N个从TP发送信令和/或转发包；
步骤S404，通过发送信令和/或转发包与从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
通过上述步骤，通过发送信令和/或转发包的方式，M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，可以依据网络的干扰问题，确定数据同步的层次，解决了相关技术中如何保证小区虚拟化效果的前提下，控制数据同步的开销的问题，进而达到了可以根据小区虚拟化的需求，灵活地调整和控制实现数据同步的层数，在保证小区虚拟化效果的前提下，控制数据同步开销。
图5是根据本发明实施例的数据同步处理方法二的流程图，如图5所示，该流程包括如下步骤：
步骤S502，从传输点TP接收主TP发送的信令和/或转发包；
步骤S504，通过接收信令和/或转发包与主TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
通过上述步骤，通过发送信令和/或转发包的方式，M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，可以依据网络的干扰问题，确定数据同步的层次，解决了相关技术中，在进行数据同步时存在开销大的问题，进而达到了有效减少数据同步时开销大的效果。
在本实施例中还提供了一种数据同步处理装置，该装置用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图6是根据本发明实施例的数据同步处理装置一的结构框图，如图6所示，该装置位于主传输点TP中，包括：发送模块62和第一同步模块64，下面对该装置进行说明。
发送模块62，设置为向M+N个从TP发送信令和/或转发包；第一同步模块64，连接至上述发送模块62，设置为通过发送信令和/或转发包与从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
图7是根据本发明实施例的数据同步处理装置二的结构框图，如图7所示，该装置位于从传输点TP中，包括：接收模块72和第二同步模块74，下面对该装置进行说明。
接收模块72，设置为接收主TP发送的信令和/或转发包；第二同步模块74，连接至上述接收模块72，设置为通过接收信令和/或转发包与主TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
通过上述实施例及优选实施方式提供的小区虚拟化过程中TP间数据同步的方案。可以根据小区虚拟化的需求，灵活的调整和控制实现数据同步的层数，在保证小区虚拟化效果的前提下，控制数据同步的开销及实现复杂度。
下面对上述方案展开说明。
将主传输点与从传输点结合说明。
该方法包括：M+N+1个TP拥有终端的下行数据，进行下行数据同步。其中包括1个Master(主)TP，M+N个slave TP。Slave(从)TP中，有M个slave TP与master TP在PDCP层进行数据同步，N个slave TP与master TP在PDCP/RLC/MAC层进行数据同步。M>＝0，N>＝0，M+N>＝1。
其中，PDCP层数据同步指slave TP与master TP的PDCP层的PDU相同。
PDCP层数据同步的方式可以包括多种，例如，PDCP层数据同步可以通过数据包转发的方式实现，包括：master TP将PDCP层的PDU发送给slave TP。PDCP层数据 同步也可以通过信令方式实现，包括：master TP将PDCP层数据同步信息发送给slave TP，slave TP根据数据同步信息对PDCP层SDU封装，形成PDCP层PDU。
其中，PDCP层数据同步信息包括但不限于以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
PDCP/RLC/MAC层数据同步指slave TP与master TP的PDCP、RLC、MAC层的PDU相同；或MAC层的PDU相同。
PDCP/RLC/MAC层数据同步也可以采用多种方式，例如，PDCP/RLC/MAC层数据同步为PDCP、RLC、MAC层PDU相同，可以通过信令方式实现，具体包括：master TP将PDCP层，RLC层，MAC层数据的数据同步信息发送给slave TP。slave TP根据PDCP层、RLC层、MAC层数据同步信息对PDCP层、RLC层、MAC层SDU封装，形成PDCP层、RLC层、MAC层PDU
PDCP/RLC/MAC层数据同步为PDCP、RLC、MAC层PDU相同，也可以通过信令加包转发的方式实现，包括：master TP将PDCP层PDU传输给slave TP，并将RLC/MAC层的数据同步信息发送给slave TP，slave TP根据数据同步信息形成RLC及MAC层PDU；或master TP将PDCP层SDU发送给slave TP，并将PDCP/RLC/MAC层的数据同步信息发送给slave TP，slave TP根据数据同步信息形成PDCP、RLC、MAC层PDU。
PDCP层数据同步信息包括但不限于以下至少之一，头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
RLC数据同步信息包括但不限于以下至少之一：RLC发送缓冲器状态、RLC层PDU包头；
MAC层数据同步信息包括但不限于以下至少之一：调度和资源分配信息(如资源的时、频位置、使用的调制编码方式，冗余版本信息等、进程序号、预编码信息)、MAC层包头；MAC层控制元素(MAC CE，MAC control element)；MAC层包头中的子包头与MAC SDU(即RLC PDU)的序号的对应关系。
PDCP/RLC/MAC层数据同步为MAC层PDU相同，通过包转发方式实现，具体包括master TP将MAC层PDU发送给slave TP。
PDCP/RLC/MAC层数据同步包括：Slave TP与master TP先进行PDCP层同步，然后再进行RLC/MAC层数据同步
需要说明的是，在进行PDCP层同步后，由master TP通过信令通知slave TP进行RLC/MAC层数据同步。
另外，上述TP包括但不限于：eNB，pico，RRH，femto。
主TP与从TP之间的同步的数据传输方式也可以采用多种方式，例如，可以采用以下方式：master TP指示节点将数据包发送给slave TP；或者master TP指示slave TP接收来自节点的数据；或者master TP指示slave TP向节点发送数据请求，由slave TP向节点提出数据发送请求，节点向slave TP发送数据
其中，当master TP指示节点将终端的数据发送给其它slave TP时，将slave TP的标识信息发送给节点，其中，slave TP检测来自节点的数据包是否含有与自己对应的标识信息；当master TP指示slave TP接收来自节点的的数据时，将数据包的相关标识信息发送给slave TP，其中，“数据包的相关标识信息”为以下至少之一：虚拟小区标识，连接标识，终端标识；当master TP指示slave TP，由slave TP向节点提出数据发送请求时，slave TP将与所申请的数据包相关的标识信息发送给节点，其中，“数据包相关的标识信息”为以下至少之一：虚拟小区标识，连接标识，终端标识。
需要指出的是，上述节点为网关或传输点。
基于用于数据同步的主TP，对该数据同步方案进行说明。
master TP通过发送信令和/或包转发的方式，使得M个slave TP与其实现PDCP层下行数据同步，N个slave TP与其实现PDCP/RLC/MAC层下行数据同步。M>＝0，N>＝0，M+N>＝1。
PDCP层数据同步指slave TP与master TP的PDCP层的PDU相同。
对应地，PDCP层数据同步可以通过多种方式实现，例如，可以通过数据包转发的方式实现，具体包括：master TP将PDCP层的PDU发送给slave TP；又例如，PDCP层数据同步也可以通过信令方式实现，具体包括：master TP将PDCP层数据同步信息发送给slave TP。
PDCP层数据同步信息包括但不限于以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
PDCP/RLC/MAC层数据同步指slave TP与master TP的PDCP、RLC、MAC层的PDU相同；或MAC层的PDU相同。同样，该PDCP/RLC/MAC层数据同步也可以采用多种方式，下面举例说明。
例如，PDCP/RLC/MAC层数据同步为PDCP、RLC、MAC层PDU相同，通过信令方式实现，包括：master TP将PDCP层，RLC层，MAC层数据同步信息发送给slave TP。又例如，PDCP/RLC/MAC层数据同步为PDCP、RLC、MAC层PDU相同，通过信令加包转发的方式实现，包括：master TP将PDCP层PDU传输给slave TP，并将RLC/MAC层的数据同步信息发送给slave TP；或master TP将PDCP层SDU发送给slave TP，并将PDCP/RLC/MAC层的数据同步信息发送给slave TP。
PDCP层数据同步信息包括但不限于以下至少之一，头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
RLC数据同步信息包括但不限于以下至少之一：RLC发送缓冲器状态、RLC层PDU包头。
MAC层数据同步信息包括但不限于以下至少之一：调度和资源分配信息(如资源的时、频位置、使用的调制编码方式，冗余版本信息等、进程序号、预编码信息)、MAC层包头；MAC层控制元素(MAC CE，MAC control element)；MAC层包头中的子包头与MAC SDU(即RLC PDU)的序号的对应关系。
PDCP/RLC/MAC层数据同步为MAC层PDU相同，通过包转发方式实现，具体包括master TP将MAC层PDU发送给slave TP。
PDCP/RLC/MAC层数据同步具体包括Slave TP与master TP先进行PDCP层同步，然后再进行RLC/MAC层数据同步。
在进行PDCP层同步后，由master TP通过信令通知slave TP进行RLC/MAC层数据同步。
TP包括但不限于：eNB，pico，RRH，femto。
master TP指示节点将终端的数据发送给其它slave TP；或者master TP指示slave TP接收来自节点的数据；或者master TP指示slave TP向节点发送数据请求。
当master TP指示节点将终端的数据发送给其它slave TP时，master TP将slave TP的标识信息发送给节点；当master TP指示slave TP接收来自节点的数据时，master TP将数据包的相关标识信息发送给slave TP。
其中，上述“数据包的相关标识信息”可以为以下至少之一：虚拟小区标识，连接标识，终端标识。
节点为网关或传输点。
基于用于数据同步的从TP，对该数据同步方案进行说明。
M+N个slave TP通过接收master TP发送的信令和/或master TP转发的包，实现与master TP下行数据同步。其中M个slave TP与master TP实现PDCP层数据同步，N个slave TP与master TP实现PDCP/RLC/MAC层数据同步。M>＝0，N>＝0，M+N>＝1。
PDCP层数据同步指slave TP与master TP的PDCP层的PDU相同。相应地，PDCP层数据同步可以采用多种方式，例如，PDCP层数据同步通过数据包转发的方式实现，包括：slave TP接收master TP发送的PDCP层的PDU；又例如，PDCP层数据同步通过信令方式实现，具体包括：slave TP接收master TP发送的数据同步信息相关的信令，根据数据同步信息对PDCP层SDU封装，形成PDCP层PDU。
PDCP层数据同步信息包括但不限于以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号；PDCP/RLC/MAC层数据同步指slave TP与master TP的PDCP、RLC、MAC层的PDU相同；或MAC层的PDU相同；PDCP/RLC/MAC层数据同步为PDCP、RLC、MAC层PDU相同，通过信令方式实现，具体包括：slave TP接收master TP发送的PDCP层，RLC层，MAC层数据同步信息，并根据数据同步信息形成PDCP层，RLC层，MAC层PDU。
PDCP/RLC/MAC层数据同步为PDCP、RLC、MAC层PDU相同，可以通过信令加包转发的方式实现，包括：slave TP接收master TP发送的PDCP层PDU及RLC/MAC层的数据同步信息，并根据数据同步信息形成RLC及MAC层PDU。或，slave TP接收master TP发送的PDCP层SDU及PDCP/RLC/MAC层的数据同步信息，并根据数据同步信息形成PDCP、RLC、MAC层PDU。
PDCP层数据同步信息包括但不限于以下至少之一，头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号；RLC数据同步信息包括但不限于以下至少之一：RLC发送缓冲器状态、RLC层PDU包头；MAC层数据同步信息 包括但不限于以下至少之一：调度和资源分配信息(如资源的时、频位置、使用的调制编码方式，冗余版本信息等、进程序号、预编码信息)、MAC层包头；MAC层控制元素(MAC CE，MAC control element)；MAC层包头中的子包头与MAC SDU(即RLC PDU)的序号的对应关系
其中，PDCP/RLC/MAC层数据同步为MAC层PDU相同，通过包转发方式实现，具体包括slave TP接收master TP发送的MAC层PDU。
PDCP/RLC/MAC层数据同步具体包括Slave TP先master TP进行PDCP层同步，然后再进行RLC/MAC层数据同步。
需要说明的是，在进行PDCP层同步后，slave TP根据master TP的信令通知进行RLC/MAC层数据同步。其中，上述TP包括但不限于：eNB，pico，RRH，femto。
在进行数据同步的过程中，可以采用多种方式，例如，slave TP检测来自节点的数据包是否含有与自己对应的标识信息；或者slave TP根据master TP指示，接收来自节点的数据；或者slave TP根据master TP指示，向节点提出数据发送请求，并接收节点发送的数据。
其中，当slave TP根据master TP指示，接收来自节点的数据时，slave TP根据master TP发送的数据包的标识信息接收数据包，“数据包的相关标识信息”为以下至少之一：虚拟小区标识，连接标识，终端标识；
当slave TP根据master TP指示，向节点提出数据发送请求时，slave TP将数据包相关的标识信息发送给节点。对应地，“数据包相关的标识信息”为以下至少之一：虚拟小区标识，连接标识，终端标识。
其中，节点为网关或传输点。
通过上述实施例及优选实施方式，解决了5G UDN网络中传输点间数据同步问题，具备如下优点：
可根据虚拟小区面临的问题灵活的选择传输点的数据同步方式，在性能与开销及同步复杂度之间取得较好的折衷。
当网络的干扰不严重时，虚拟小区主要解决终端的移动性问题，这时候虚拟小区的传输点只需要在PDCP层实现数据同步。因此，在解决移动性问题的同时，减少了由RLC/MAC层同步带来的开销。
当网络的干扰严重时，虚拟小区需要解决干扰问题。这时候虚拟小区的传输点需要在PDCP/RLC/MAC层同步，以便在传输点间实现信号的联合处理，达到较好的干扰抑制效果。
解决移动性问题所需要进行PDCP层数据同步的传输点数量与解决干扰问题所需要进行PDCP/RLC/MAC层数据同步的传输点数量可能不同。可以实现一部分节点只在PDCP层实现数据同步，一部分节点根据需要(比如干扰抑制方面的需要)，在PDCP层同步的基础上再在RLC/MAC层实现数据同步或直接进行MAC层数据同步。实现了MAC层数据同步的节点可以用来进行信号联合处理，解决干扰问题，实现了PDCP层数据同步的传输点可以用来解决移动性问题。在解决移动性/干扰问题的同时，降低开销。
可根据传输点的特点选择数据方法：当传输点可以直接从网关获取用户数据时，可以选择基于信令的数据同步方式。这种方式减少了直接由master TP转发数据包所带来的开销。当传输点不能直接从网关获取用户数据时或传输点之间的链路资源较丰富时，可以选择由master TP转发数据包来实现数据同步。上述方法同时实现RLC和MAC层数据同步。保证RLC层可以根据MAC层的调度和资源分配情况进行数据封装，提高了系统的工作效率。
另外，上述方法还减少了传输点间的数据量，进而减少了对传输点间链路(前传链路)资源的使用。因此，当前传链路和接入链路(传输点与终端之间的链路)共享频率资源的时候，还可以降低前传链路与接入链路之间的干扰。
下面将结合附图描述本发明实施例。
实施例一：
下面举例说明虚拟小区中的传输点从网关(或网关)获取数据包方法：
图8是根据本发明实施例的传输点通过有线backhaul获取虚拟小区数据的示意图，如图8所示，传输点TP0/TP1/TP2(如图8-(A)、图8-(B)所示)或传输点TP0/TP1/TP2/TP3/TP4(如图8-(C)、图8-(D)所示)组成终端的虚拟小区，并通过wired backhaul获得来自网关(GW，Gate way)的数据，其中TP0为master TP，已可以通过网关获得数据。
对于图8-(A)的环形网络结构，来自网关的数据包在各个TP组成的“环”上。TP0将来自网关的数据包的接收信息通过TP间的接口传递给TP1/TP2，这样TP1/TP2 可识别并接收属于该虚拟小区的数据。TP间的接口可以通过wireless backhaul(无线回程)或连接各TP的wired backhaul(有线回程)实现。数据包的接收信息包括(但不限于)数据包的地址信息或标识信息。各TP利用该信息识别数据包是否属于虚拟小区所服务的终端。
对于图8-(B)的星形网络结构，各个TP分别到网关获取数据。TP0将TP1/TP2的识别信息(比如地址信息或TP的标识)发送给网关，然后网关将该虚拟小区对应的数据包同时发送给TP0/TP1/TP2。或者，TP0通知TP1/TP2到网关获取该虚拟小区的数据包后，TP1/TP2向网关提出请求，网关将该虚拟小区的数据发送给TP1/TP2。
对于图8-(C)或图8-(D)的混合型网络结构，可以通过连接到网关的节点获取数据。比如在图8-(C)的网络结构中，TP3/TP4加入到虚拟小区之后，可由TP0通知TP2将数据发送给TP3/TP4。对于图8-(D)的混合型网络结构，可以由TP0将数据包的标识信息发送给TP3/TP4。TP3/TP4通过与TP2连接的环境网络接收数据包。
下面举例说明传输点通过wireless backhaul中的信令实现PDCP层数据同步的方法。
TP0将用于PDCP层数据同步的配置信息通过广播信令或终端专用信令的方式发送给虚拟小区中的其它TP。配置信息包括(以用户面PDCP Data PDU为例)：PDCP层包头压缩配置信息(比如所采用的包头压缩算法)、加密/解密的配置信息(如密钥)、PDCP层数据包的序列号(SN)长度、数据包序列号同步的相关信息(参见序列号同步方法中的描述)。TP1/TP2(或TP1/TP2/TP3/TP4)根据这些信息对数据包进行加密、包头压缩、添加PDU包头等操作，形成PDCP PDU；或者，TP0将包头压缩配置信息、加密/解密的配置信息、PDCP PDU包头发送给TP1/TP2(或TP1/TP2/TP3/TP4)。TP1/TP2(或TP1/TP2/TP3/TP4)对PDCP SDU进行加密、包头压缩后，直接添加包头形成PDCP PDU。
如果数据包缓存一定时间仍未被传输，传输点会进行丢包处理，来控制TCP层(Transport Control Protocol)数据速率。这一操作通常利用丢包计时器(DiscardTimer)完成。即每一个数据包到达时，为这个数据包的DiscardTimer设置一个初始值。DiscardTimer随时间递减，当减到0时，传输节点将相应的包丢弃。
下面介绍一种方法，保证各个传输点在丢包操作方面实现同步。图9是根据本发明实施例的数据包序号分配方法示意图，如图9所示，每个到达的数据包与一个时间轴上的标识(tag)对应，虽然数据包到达不同TP的时间不同，但丢包计时器都根据 各个包的tag开始计时。比如TP1/TP2的第1个包的丢包计时器都在tag1的位置开始计时。
序列号的同步方法包括：(1)TP0指示一个数据包的序列号，所有TP都将该序号号分配给该数据包所形成的PDCP层PDU。之后，每接收到一个数据包之后，序列号都自动递增。(2)每个到达的数据包与一个时间轴上的标识对应，每个时间轴上的标识与一个序列号对应。如图9所示，TP0及TP1的数据包0分别在t0和t1时刻到达，对应tag0，分配序号0。TP0的数据包1在t2时刻到达，与tag1对应，分配序列号1。TP1的数据包1在t3时刻到达，与tag2对应，但由于tag1与tag2之间无数据包，因此TP1的数据包1与tag2对应，分配序列号1。
下面举例说明实现PDCP层数据同步的传输点所形成的虚拟小区如何解决移动性问题
以图8-(A)为例，终端从与TP0较近的位置朝TP1的方向移动。TP0/TP1/TP2在PDCP层达到数据同步，PDU0/1/2/3/4…。完全相同。当TP0的信号较强时，由TP0为终端提供数据服务，PDCP PDU0/1已完全传输完毕，正在传输PDCP PDU2。当TP1的信号较强时，TP0将自己的RLC/MAC层复位，并指示终端RLC/MAC层复位(包括RLC/MAC层参数复位，并丢弃位于RLC/MAC层与PDCP PDU2相关的数据包)。TP0指示TP1继续传输PDCP PDU2。TP1根据自身RLC/MAC配置参数封装PDCP PDU2并开始向终端发送数据。另外，TP0也可以在这个时候通知TP1成为新的master TP。
实施例二
图10是根据本发明实施例的传输点通过PDCP层包转发方式获得虚拟小区数据实现数据同步的示意图,如图10所示,传输点TP0/TP1/TP2(如图10)组成终端的虚拟小区。T0为master TP，通过wired backhaul获得来自网关(GW，Gate way)的数据(TP1/TP2可以通过wired backhaul连接网关，也可以不与网关连接)。TP0在PDCP层对来自网关的数据进行封装，形成PDCP层PDU。TP0利用wireless backhaul将PDCP层PDU发送给TP1/TP2，实现TP0/TP1/TP2之间的数据同步。
TP0可以使用广播方式转发数据包，也可以使用单播的方式分别将数据包发送给TP1/TP2。
如图10-(A)所示，终端从与TP0较近的位置朝TP1的方向移动。TP0/TP1/TP2在PDCP层达到数据同步，PDCP PDU0/1/2/3/4…。完全相同。当TP0的信号较强时， 由TP0为终端提供数据服务，PDCP PDU0/1已完全传输完毕，正在传输PDCP PDU2。当TP1的信号较强时，TP0将自己的RLC/MAC层复位，并指示终端RLC/MAC层复位。即RLC/MAC层参数复位，并丢弃位于RLC/MAC层与PDCP PDU2相关的数据包。TP0指示TP1继续传输PDCP PDU2。TP1根据自身RLC/MAC配置参数封装PDCP PDU2并开始向终端发送数据。另外，TP0也可以在这个时候通知TP1成为新的master TP。
在图10-(A)的例子中，RLC/MAC层复位导致RLC/MAC层正在传输的数据包被丢弃，需要在TP1重新传输的问题。该问题会引起资源的浪费，增加数据包传输的延迟。在数据速率较高的情况下，这一问题可能会严重影响系统性能。另一个可能的方案如图10-(B)所示，TP0将PDCP PDU2传输完之后再进行RLC/MAC层复位。在PDCP PDU2传输过程中，终端可以与TP1建立连接并建立新的RLC/MAC实体，开始传输PDCP PDU3。
实施例三
图11是根据本发明实施例的传输点通过有线backhaul获取虚拟小区数据，利用PDCP/RLC/MAC同步信息实现数据同步的示意图，如图11所示，传输点TP0/TP1/TP2组成终端的虚拟小区，并通过wired backhaul获得来自网关(GW，Gate way)的数据(以环形网络结构为例，其它网络结构及获取网关数据的方法如实施例一)，其中TP0为master TP。
下面介绍两种实现PDCP/RLC/MAC数据同步的方法
方法一：各TP同时实现PDCP/RLC/MAC层同步，如图11-(A)所示
TP0将PDCP/RLC/MAC层的数据同步信息一起发送给虚拟小区内的TP1和TP2(通过广播的方式发送或分别发送给TP1/TP2)。TP1/TP2根据这些信息完成与TP0在相应层的数据同步。具体方法如下：
(1)PDCP层的同步信息及相应的数据同步方法参见实施例一。
(2)RLC层的信息包括(以UM模式为例)：发送缓冲器的状态；RLC PDU的包头。TP1/TP2根据TP0发送缓冲器状态更新自身的发送缓冲器。TP1/TP2根据TP0的RLC PDU包头指示的数据同步信息从各自的发送缓冲器中取出RLC SDU，对RLC SDU进行分段/级联，添加包头，将其封装成RLC PDU。
(3)MAC层的信息包括：
对于首次传输的MAC PDU：调度和资源分配信息(如资源的时、频位置、使用的调制编码方式，冗余版本信息等、进程序号、预编码信息)；MAC层包头；MAC层控制元素(MAC control element)；MAC层包头中的子包头与MAC SDU(即RLC PDU)的序号的对应关系。
对于重传的MAC PDU：调度和资源分配信息(如资源的时、频位置、使用的调制编码方式，冗余版本信息等、进程序号、预编码信息)。
方法二：TP1与TP0实现PDCP层同步，TP2与TP0实现PDCP/RLC/MAC层同步，如图11-(B)所示
TP0将PDCP层的数据同步信息发送给TP1和TP2，将RLC/MAC层数据同步信息发送给TP2。TP1与TP0实现PDCP层同步，TP2与TP0实现PDCP/RLC/MAC层同步。各层同步信息的内容及数据同步的方法参见方法一的描述。
下面举例说明如何通过本实施例给出的方法解决干扰及移动性问题。
对于方法一(见图11-(A))，终端从与TP0/TP2较近的位置朝离TP1/TP2较近的位置移动。TP0/TP1/TP2在PDCP/RLC/MAC层达到数据同步。
在离TP0/TP2较近的位置时，终端由TP0/TP2为其提供数据传输服务，通过联合信号处理解决干扰问题。信号联合处理(JP，Joint Processing)包括：信号联合发送(JT，Joint Transmission)，即TP0和TP2发送相同的MAC层数据，物理信号在终端处相干(coherent)叠加或非相干(non-coherent)叠加，以提高接收信号的强度，对抗干扰；或者动态传输点选择(DPS，Dynamic Point Selection)在TP0和TP2之间动态选择信号质量最好的传输点为终端服务。
终端在朝离TP1/TP2较近的位置移动时，TP0的信号逐渐变差，TP1的信号逐渐变好。这时，TP0指示TP1/TP2采用信号联合处理的方式为终端提供服务。
对于方法二(见图11-(B))，终端从与TP0/TP2较近的位置朝离TP1/TP2较近的位置移动。TP0/TP2在PDCP/RLC/MAC层达到数据同步；TP0/TP1在PDCP层达到数据同步。
在离TP0/TP2较近的位置时，终端由TP0/TP1为其提供数据传输服务，通过联合信号处理解决干扰问题。当终端移动到离TP1/TP2较近的位置时，如果选择TP1继续为终端提供服务，TP0将自己的RLC/MAC层复位，并指示终端RLC/MAC层复位(包括RLC/MAC层参数复位，并丢弃位于RLC/MAC层正在传输的数据包)。TP0指示 TP1继续传输与RLC/MAC层已丢弃数据包对应的PDCP PDU。TP1根据自身RLC/MAC配置参数封装相应的PDCP PDU并开始向终端发送数据。或者TP0在指示TP1为终端提供服务的同时，仍然与终端保持连接，继续传输RLC/MAC层未发送完的数据包(此时TP0/TP1同时为终端提供服务)。
实施例四
图12是根据本发明实施例的传输点通过MAC层包转发方式获得虚拟小区数据实现数据同步的示意图，如图12所示，传输点TP0/TP1/TP2(如图12所示)组成终端的虚拟小区。T0为master TP，通过wired backhaul获得来自网关(GW，Gate way)的数据(TP1/TP2可以通过wired backhaul连接网关，也可以不与网关连接)。TP0在PDCP/RLC/MAC层对来自网关的数据进行封装，形成MAC层PDU。TP0利用wireless backhaul将MAC层PDU及调度和资源分配信息发送给TP1/TP2，实现TP0/TP1/TP2之间的数据同步。
TP0可以使用广播方式转发数据包，也可以使用单播的方式分别将数据包发送给TP1/TP2。下面举例说明如何通过本例所给出的数据同步方法解决干扰及移动性问题。
如图12-(A)所示，终端在离TP0较近的位置向离TP1较近的位置移动。在与TP0较近时，由TP0为其提供服务(发送数据及相关的调度、资源分配信息)，MAC PDU0已经被正确接收，MAC PDU1正在重传。当移动到与TP1较近的位置时，TP0指示TP1为终端提供服务，TP1继续发送MAC PDU1的重传包。另外，当TP1为终端服务的时候，资源分配及调度信息可由TP0发送给终端也可由TP1发送给终端。
如图12-(B)所示，终端在离TP0较近的位置向离TP1较近的位置移动。在与TP0较近时，由TP0为其提供服务(发送数据及相关的调度、资源分配信息)，MAC PDU0已经被正确接收，MAC PDU1正在重传。当终端向TP1移动时，TP0指示TP1为终端提供服务。为了提高信号的接收质量、对抗干扰，TP0/TP1采用信号联合发送的方式同时为终端提供服务，继续发送MAC PDU1的重传包。
实施例五
传输点TP0/TP1/TP2组成终端的虚拟小区。T0为master TP，通过wired backhaul获得来自网关(GW，Gate way)的数据(TP1/TP2可以通过wired backhaul连接网关，也可以不与网关连接)。TP0在PDCP层对来自网关的数据进行封装(包括加密等操作)，形成PDCP层PDU。TP0利用wireless backhaul将PDCP层PDU发送给TP1/TP2，将RLC/MAC层数据同步信息发送给TP2。TP2根据RLC/MAC层数据同步信息对PDCP  PDU进行封装，得到RLC/MAC层PDU。(RLC/MAC数据同步信息及同步方法参见实施例三)
根据本实施例的数据同步方法，TP0/TP1可以实现PDCP层数据同步，TP0/TP2可以实现PDCP/RLC/MAC层数据同步。移动性及干扰问题的解决方法参见实施例三。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
如上所述，通过上述实施例及优选实施方式，解决了相关技术中，如何保证小区虚拟化效果的前提下，控制数据同步的开销的问题，进而达到了可以根据小区虚拟化的需求，灵活地调整和控制实现数据同步的层数，在保证小区虚拟化效果的前提下，控制数据同步开销及实现复杂度的效果。

Claims (34)

  1. 一种数据同步处理方法，包括：
    主传输点TP向M+N个从TP发送信令和/或转发包；
    通过发送信令和/或转发包与所述从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
  2. 根据权利要求1所述的方法，其中，所述PDCP层数据同步为从TP与主TP的PDCP层的协议数据单元PDU相同。
  3. 根据权利要求2所述的方法，其中，通过以下方式至少之一进行所述PDCP层数据同步：
    数据包转发的方式，其中，所述数据包转发的方式包括：所述主TP将所述PDCP层的所述PDU发送给所述从TP；
    通过信令方式，其中，所述信令方式包括：所述主TP将所述PDCP层数据同步信息发送给所述从TP，所述数据同步信息用于所述从TP对PDCP层SDU封装，形成PDCP层PDU。
  4. 根据权利要求3所述的方法，其中，所述PDCP层数据同步信息包括以下至少之一：
    头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
  5. 根据权利要求1所述的方法，其中，所述PDCP/RLC/MAC层数据同步为所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同；或MAC层的PDU相同。
  6. 根据权利要求5所述的方法，其中，通过以下方式至少之一进行所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同：
    通过信令的方式，其中，所述信令的方式包括：所述主TP将PDCP层，RLC层，MAC层数据的数据同步信息发送给所述从TP，所述PDCP层、RLC 层、MAC层的所述数据同步信息用于所述从TP对PDCP层、RLC层、MAC层SDU封装，形成PDCP层、RLC层、MAC层PDU；
    通过信令加包转发的方式，其中，所述信令加包转发的方式包括：所述主TP将PDCP层PDU传输给所述从TP，并将RLC/MAC层的数据同步信息发送给所述从TP，所述数据同步信息用于所述从TP形成RLC及MAC层PDU；或所述主TP将PDCP层SDU发送给所述从TP，并将PDCP/RLC/MAC层的数据同步信息发送给所述从TP，所述数据同步信息用于所述从TP形成PDCP、RLC、MAC层PDU。
  7. 根据权利要求6所述的方法，其中，包括以下至少之一：
    所述PDCP层数据同步信息包括以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号；
    所述RLC数据同步信息包括以下至少之一：RLC发送缓冲器状态、RLC层PDU包头；
    所述MAC层数据同步信息包括以下至少之一：调度和资源分配信息、MAC层包头；MAC层控制元素；MAC层包头中的子包头与MAC SDU的序号的对应关系。
  8. 根据权利要求5所述的方法，其中，所述PDCP/RLC/MAC层数据同步为MAC层PDU相同，通过包转发方式实现，包括：所述主TP将MAC层PDU发送给所述从TP。
  9. 根据权利要求1所述的方法，其中，所述PDCP层数据同步包括：
    所述从TP与所述主TP先进行PDCP层同步，然后再进行RLC/MAC层数据同步。
  10. 根据权利要求9所述的方法，其中，在进行PDCP层同步后，由所述主TP通过信令通知所述从TP进行RLC/MAC层数据同步。
  11. 根据权利要求1所述的方法，其中，所述PDCP层数据同步包括以下至少之一：
    所述主TP指示节点将数据包发送给所述从TP；
    所述主TP指示所述从TP接收来自节点的数据；
    所述主TP指示所述从TP向节点发送数据请求，由所述从TP向节点提出数据发送请求，节点向所述从TP发送数据。
  12. 根据权利要求11所述的方法，其中，
    在所述主TP指示节点将数据包发送给所述从TP时，所述主TP将所述从TP的标识信息发送给节点；
    在所述主TP指示所述从TP接收来自节点的数据时，所述主TP将所述数据包的标识信息发送给所述从TP；
    在所述主TP指示所述从TP向节点发送数据请求，由所述从TP向节点提出数据发送请求，节点向所述从TP发送数据时，并由所述从TP将与所申请的数据包的标识信息发送给所述节点。
  13. 根据权利要求12所述的方法，其中，
    在所述主TP指示节点将数据包发送给所述从TP时，所述从TP检测来自所述节点的数据包是否含有与所述从TP对应的标识信息。
  14. 根据权利要求12所述的方法，其中，所述数据包的标识信息包括以下至少之一：
    虚拟小区标识、连接标识、用户设备标识。
  15. 根据权利要求11所述的方法，其中，所述节点为网关或TP。
  16. 根据权利要求1至15中任一项所述的方法，其中，
    所述TP包括以下至少之一：宏基站、小基站、RRH、微基站。
  17. 一种数据同步处理方法，包括：
    从传输点TP接收主TP发送的信令和/或转发包；
    通过接收信令和/或转发包与所述主TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
  18. 根据权利要求17所述的方法，其中，所述PDCP层数据同步为从TP与主TP的PDCP层的协议数据单元PDU相同。
  19. 根据权利要求18所述的方法，其中，通过以下方式至少之一进行所述PDCP层数据同步：
    数据包转发的方式，其中，所述数据包转发的方式包括：所述从TP接收所述主TP发送的所述PDCP层的所述PDU；
    通过信令方式，其中，所述信令方式包括：所述从TP接收所述主TP发送的所述PDCP层数据同步信息，所述从TP依据所述数据同步信息对PDCP层SDU封装，形成PDCP层PDU。
  20. 根据权利要求19所述的方法，其中，所述PDCP层数据同步信息包括以下至少之一：
    头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号。
  21. 根据权利要求17所述的方法，其中，所述PDCP/RLC/MAC层数据同步为所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同；或MAC层的PDU相同。
  22. 根据权利要求21所述的方法，其中，通过以下方式至少之一进行所述从TP与所述主TP的PDCP、RLC、MAC层的PDU相同：
    通过信令的方式，其中，所述信令的方式包括：所述从TP接收所述主TP发送的PDCP层，RLC层，MAC层数据的数据同步信息，所述从TP依据所述PDCP层、RLC层、MAC层的所述数据同步信息对PDCP层、RLC层、MAC层SDU封装，形成PDCP层、RLC层、MAC层PDU；
    通过信令加包转发的方式，其中，所述信令加包转发的方式包括：所述从TP接收所述主TP传输的PDCP层PDU，及RLC/MAC层的数据同步信息，所述从TP根据所述数据同步信息所述从TP形成RLC及MAC层PDU；或所述从TP接收所述主TP发送的PDCP层SDU，以及PDCP/RLC/MAC层的数据同步信息，并依据所述数据同步信息形成PDCP、RLC、MAC层PDU。
  23. 根据权利要求22所述的方法，其中，包括以下至少之一：
    所述PDCP层数据同步信息包括以下至少之一：头压缩信息、加密信息、PDCP层包头、PDCP数据包序号、超帧号、最大数据包序号；
    所述RLC数据同步信息包括以下至少之一：RLC发送缓冲器状态、RLC层PDU包头；
    所述MAC层数据同步信息包括以下至少之一：调度和资源分配信息、MAC层包头；MAC层控制元素；MAC层包头中的子包头与MAC SDU的序号的对应关系。
  24. 根据权利要求21所述的方法，其中，所述PDCP/RLC/MAC层数据同步为MAC层PDU相同，通过包转发方式实现，包括：所述从TP接收所述主TP发送的MAC层PDU。
  25. 根据权利要求17所述的方法，其中，所述PDCP层数据同步包括：
    所述从TP与所述主TP先进行PDCP层同步，然后再进行RLC/MAC层数据同步。
  26. 根据权利要求25所述的方法，其中，在进行PDCP层同步后，所述从TP根据所述主TP的信令通知进行RLC/MAC层数据同步。
  27. 根据权利要求17所述的方法，其中，所述PDCP层数据同步包括以下至少之一：
    所述主TP指示节点将数据包发送给所述从TP；
    所述主TP指示所述从TP接收来自节点的数据；
    所述主TP指示所述从TP向节点发送数据请求，由所述从TP向节点提出数据发送请求，节点向所述从TP发送数据。
  28. 根据权利要求27所述的方法，其中，
    所述从TP检测到来自节点的数据包是否含有与自己对应的标识信息；
    所述从TP根据所述主TP的指示，接收来自节点的数据；
    所述从TP根据所述主TP指示，向节点提出数据发送请求，并接收节点发送的数据。
  29. 根据权利要求28所述的方法，其中，
    当所述从TP根据所述主TP指示，接收来自节点的数据时，所述从TP根据所述主TP发送的数据包的标识信息接收数据包；
    当所述从TP根据所述主TP指示，向节点提出数据发送请求时，所述从TP将数据包的标识信息发送给节点。
  30. 根据权利要求28所述的方法，其中，所述数据包的标识信息包括以下至少之一：
    虚拟小区标识、连接标识、用户设备标识。
  31. 根据权利要求27所述的方法，其中，所述节点为网关或TP。
  32. 根据权利要求17至31中任一项所述的方法，其中，
    所述TP包括以下至少之一：宏基站、小基站、RRH、微基站。
  33. 一种数据同步处理装置，位于主传输点TP中，包括：
    发送模块，设置为向M+N个从TP发送信令和/或转发包；
    第一同步模块，设置为通过发送信令和/或转发包与所述从TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
  34. 一种数据同步处理装置，位于从传输点TP中，包括：
    接收模块，设置为接收主TP发送的信令和/或转发包；
    第二同步模块，设置为通过接收信令和/或转发包与所述主TP进行下行数据同步，其中，有M个从TP与主TP在分组数据汇聚协议PDCP层进行数据同步，N个从TP与主TP在PDCP/无线链路控制RLC/媒体接入控制MAC层进行数据同步，M>＝0，N>＝0，M+N>＝1。
PCT/CN2015/075919 2014-09-29 2015-04-03 数据同步处理方法及装置 WO2016050042A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2017517024A JP2017530644A (ja) 2014-09-29 2015-04-03 データ同期処理方法及び装置
EP15846255.6A EP3203705A4 (en) 2014-09-29 2015-04-03 Synchronous data processing method and device
US15/515,340 US20170238195A1 (en) 2014-09-29 2015-04-03 Method and device for data synchronization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410515782.2A CN105451210A (zh) 2014-09-29 2014-09-29 数据同步处理方法及装置
CN201410515782.2 2014-09-29

Publications (1)

Publication Number Publication Date
WO2016050042A1 true WO2016050042A1 (zh) 2016-04-07

Family

ID=55560909

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/075919 WO2016050042A1 (zh) 2014-09-29 2015-04-03 数据同步处理方法及装置

Country Status (5)

Country Link
US (1) US20170238195A1 (zh)
EP (1) EP3203705A4 (zh)
JP (1) JP2017530644A (zh)
CN (1) CN105451210A (zh)
WO (1) WO2016050042A1 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105828337A (zh) * 2014-09-17 2016-08-03 中兴通讯股份有限公司 一种动态构建虚拟小区的方法和装置
US10084537B2 (en) * 2017-01-17 2018-09-25 Nokia Solutions And Networks Oy Method and apparatus for synchronization
CN107509223B (zh) * 2017-06-30 2020-09-01 清华大学 一种虚拟小区的构建方法和装置
WO2019023862A1 (zh) * 2017-07-31 2019-02-07 Oppo广东移动通信有限公司 数据处理方法及相关产品
CN109474651B (zh) * 2017-09-08 2020-08-25 华为技术有限公司 处理数据的方法和设备
CN108092821B (zh) * 2017-12-29 2021-05-18 京信通信系统（中国）有限公司 一种分组数据汇聚协议pdcp层通信恢复的方法及装置
CN109348491B (zh) * 2018-10-16 2021-11-02 京信网络系统股份有限公司 L2状态变量失步恢复的方法、装置及设备
CN110361979B (zh) * 2019-07-19 2022-08-16 北京交大思诺科技股份有限公司 一种铁路信号领域的安全计算机平台
CN117082573A (zh) * 2022-05-09 2023-11-17 维沃移动通信有限公司 数据包序号同步方法、装置及通信设备
CN116996527B (zh) * 2023-09-25 2023-12-12 北京中科网芯科技有限公司 一种汇聚分流器数据同步的方法及存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009144134A1 (fr) * 2008-05-27 2009-12-03 Enensys Technologies Dispositif et procédé de synchronisation de flux de données numériques
CN101604995A (zh) * 2008-06-11 2009-12-16 普天信息技术研究院有限公司 一种在rnc之间实现mbms同步的方法和系统
CN103796287A (zh) * 2012-11-02 2014-05-14 北京三星通信技术研究有限公司 一种异构网络下的数据传输方法及系统
CN103929491A (zh) * 2014-04-28 2014-07-16 深圳市中兴移动通信有限公司 数据同步方法和系统及移动终端

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8208498B2 (en) * 2007-10-30 2012-06-26 Qualcomm Incorporated Methods and systems for HFN handling at inter-base station handover in mobile communication networks
US20120275399A1 (en) * 2011-04-27 2012-11-01 Qualcomm Incorporated System and method for synchronized radio link control and media access control in a wireless communication network
CA2901203C (en) * 2013-02-12 2019-05-21 Altiostar Networks, Inc. Long term evolution radio access network
US10334585B2 (en) * 2013-03-15 2019-06-25 Nokia Solutions And Networks Oy Coordinated multipoint joint transmission with relaxed backhaul requirements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009144134A1 (fr) * 2008-05-27 2009-12-03 Enensys Technologies Dispositif et procédé de synchronisation de flux de données numériques
CN101604995A (zh) * 2008-06-11 2009-12-16 普天信息技术研究院有限公司 一种在rnc之间实现mbms同步的方法和系统
CN103796287A (zh) * 2012-11-02 2014-05-14 北京三星通信技术研究有限公司 一种异构网络下的数据传输方法及系统
CN103929491A (zh) * 2014-04-28 2014-07-16 深圳市中兴移动通信有限公司 数据同步方法和系统及移动终端

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3203705A4 *

Also Published As

Publication number Publication date
EP3203705A1 (en) 2017-08-09
CN105451210A (zh) 2016-03-30
US20170238195A1 (en) 2017-08-17
EP3203705A4 (en) 2017-09-20
JP2017530644A (ja) 2017-10-12

Similar Documents

Publication Publication Date Title
JP7267962B2 (ja) 複数のサイト間のデータ分割
WO2016050042A1 (zh) 数据同步处理方法及装置
KR102598001B1 (ko) 이동 통신 시스템에서 효율적인 패킷 중복 전송을 위한 방법 및 장치
US11445404B2 (en) Method and apparatus for wireless communication in wireless communication system
JP5999269B2 (ja) マルチｒａｔシステムにおける無線通信
KR102376115B1 (ko) 차세대 이동 통신 시스템에서 pdcp 버전 변경에 따른 재설정 방법 및 장치
USRE48316E1 (en) Communications system, base station, user equipment, and signaling transmission method
US11838797B2 (en) Method and device for improved communication performance in wireless communication system
US11943611B2 (en) Method and apparatus for identifying security key in next generation mobile communication system
WO2015032043A1 (zh) 传输数据的方法、装置和系统
KR20190083944A (ko) 무선 통신 시스템에서 개선된 통신 성능을 위한 방법 및 장치
US11382169B2 (en) Methods and apparatuses for transmitting and receiving data in wireless communication system
JP2022532307A (ja) マルチａｐジョイント再送のための通信装置及び通信方法
WO2019029612A1 (zh) 数据传输的方法以及设备
WO2019029642A1 (zh) 通信方法、基站、终端设备和系统
JP2015530839A (ja) 異種ネットワーク内のハンドオーバー管理のための方法
US11974185B2 (en) Method and device for handover without suspension of data transmission and reception in next generation mobile communication system
US20240187951A1 (en) Method and device which minimize interrupt during handover in integrated access backhaul system and which are for first connection in multiple mobile terminals
WO2024067538A1 (zh) 一种被用于无线通信的通信节点中的方法和装置
WO2022206418A1 (zh) 通信方法及通信装置
CN114079916A (zh) 一种被用于无线通信的方法和设备
KR20090056629A (ko) 기지국간 무손실 핸드오버를 위한 패킷 포워딩 방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15846255

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2017517024

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2015846255

Country of ref document: EP