WO2010124641A1 - Système d'évolution à long terme et son procédé de transmission de données - Google Patents

Système d'évolution à long terme et son procédé de transmission de données Download PDF

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Publication number
WO2010124641A1
WO2010124641A1 PCT/CN2010/072308 CN2010072308W WO2010124641A1 WO 2010124641 A1 WO2010124641 A1 WO 2010124641A1 CN 2010072308 W CN2010072308 W CN 2010072308W WO 2010124641 A1 WO2010124641 A1 WO 2010124641A1
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WIPO (PCT)
Prior art keywords
layer
network element
relay station
denb
user plane
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PCT/CN2010/072308
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English (en)
Chinese (zh)
Inventor
黄亚达
沈晓芹
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中兴通讯股份有限公司
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Publication of WO2010124641A1 publication Critical patent/WO2010124641A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to a cellular wireless communication system, and more particularly to a long term evolution system and a data transmission method thereof.
  • the cellular wireless communication system includes a terminal, a radio access network, and a core network.
  • the network formed by the base station or the base station and the base station controller is called a Radio Access Network (RAN), and is responsible for access layer transactions, such as radio resources.
  • FIG. 1 is a structural diagram of a cellular radio communication system in the prior art, in which only three base stations, namely, a base station 1, a base station 2, and a base station 3 are shown. The physical connection or logical connection between the base stations can be performed according to actual conditions.
  • Each base station can be connected to one or more core network nodes (Core Network, CN).
  • the core network is responsible for non-access layer transactions, such as location updates, and is the anchor point for the user plane.
  • UE User Equipment
  • UE refers to various devices that can communicate with a cellular wireless communication network, such as a mobile phone or a notebook computer.
  • the wireless coverage of base stations is limited for a variety of reasons, such as the blockage of wireless signals by various building structures, which inevitably causes coverage gaps in wireless networks.
  • the wireless signal strength is weakened at the cell edge and the interference of the neighboring cell causes the communication quality to be poor, and the error rate of the wireless transmission is increased.
  • one solution that can be employed is to introduce a wireless network node in a cellular wireless communication system, the wireless network node is called For relay, it is also called Relay Node/Relay Station.
  • Relay is located between other network nodes and has a relay function for wireless link data and control information.
  • the working principle is shown in Figure 2.
  • the UE directly served by the base station is called Macro UE, and the UE of the Relay service is called Relay UE (Relay UE).
  • Direct link The wireless link between the base station and the UE, including uplink and downlink (DL) And UL, ie downlink and uplink) direct link;
  • Access link The wireless link between the Relay and the UE, including the DL and UL access links;
  • Backhaul link The wireless link between the base station and the relay, including DL and UL trunk links.
  • Relay can relay data through various methods, such as directly amplifying the received wireless signal transmitted by the base station, or receiving the data sent by the base station and performing corresponding processing (such as demodulation, decoding, etc.), and then forwarding the data to the terminal. Or the base station and the relay cooperate to send data to the terminal; instead, the Relay also relays data sent from the terminal to the base station.
  • the UE cannot distinguish between the relay and the cell under the base station. That is, in the UE's view, the cell under the relay (that is, the cell covered by the relay) has no cell with the cell under the base station. Such a cell may be referred to as a relay cell.
  • the Relay cell like all cells, has its own phySlcal cell identity (PCI) and can also send broadcasts. When the UE camps in the Relay cell, the Relay may separately allocate the scheduled radio resource usage to the UE, and the scheduling radio resource and the evolved base station (DeNB, which is abbreviated as DeNB in the text, that is the relay connected by the backhaul link) Scheduling wireless resources are independent of each other.
  • the interface between the Relay and Relay UE and the protocol stack are the same as the interface and protocol stack between the normal base station cell and the UE.
  • the Long Term Evolution (LTE) system uses a flat protocol based on the Internet Protocol (IP), as shown in Figure 3, including the Evolved Universal Terrestrial Radio Access Network (E). - UTRAN), CN node and other supporting nodes; the CN node further includes a Mobility Management Entity (MME) and a Serving Gateway (S-GW); wherein the MME is responsible for mobility management and non-access stratum Control plane related operations such as processing of the command and management of the user's mobility management context; S-GW is responsible for the transmission, forwarding, and routing of UE user plane data; LTE base stations (eNodeBs, eNBs) logically communicate with each other through the X2 interface. Connection, used to support UE mobility within the entire network, ensuring seamless switching of users;
  • Each eNB passes the S1 interface (including the control plane S1-MME interface and the user plane S1-U interface) Connected to the System Architecture Evolution (SAE) core network, that is, connected to the ⁇ by the control plane S1-MME interface, connected to the S-GW through the user plane S1-U interface, and the S1 interface supports the eNB and the MME and the S-GW.
  • SAE System Architecture Evolution
  • the protocol stack of the control plane S1-MME interface is shown in Figure 4. From bottom to top, the physical layer and the data link layer (date link layer), that is, the L2/L1 layer, and the network layer use the IP protocol.
  • SCTP Stream Control Transmission Protocol
  • S1-AP SI Application Layer
  • the constructed transport bearer transmits the signaling of the S1-AP;
  • the protocol stack of the user plane S1-U interface is shown in Figure 5. From bottom to top, the physical layer (L1), the data link layer (L2), the Internet Protocol layer (IP), and the User Datagram Protocol (User Datagram Protocol, UDP) and the user-side general packet radio service (GPRS) tunneling protocol layer GTP-U, which constitute a user plane protocol data unit (PDU) for transmitting between the eNB and the S-GW.
  • Transport bearers each transport bearer is used to carry data for one service.
  • GTP-U is a tunneling protocol, which is used to implement the seamless transmission on the IPv4 and IPv6.
  • the Tunnel Endpoint Identifier (TEID) of the GTP-U layer includes the source side GTP-U TEID and the target side GTP-U TEID.
  • the IP address identifier of the IP layer includes the source IP address and the destination IP address.
  • the UDP port number is fixed to 2152.
  • Each eNB and the UE transmit signaling and data through a Uu interface (originally defined as a radio interface between the UTRAN and the UE).
  • 6 and 7 respectively show the protocol stacks of the user plane and the control plane between the eNB and the UE.
  • the protocol stack of the user plane is the physical layer (PHY), the medium access control (MAC), the radio link control (RLC), and the packet data convergence layer (Packet) from bottom to top.
  • Data Convergence Protocol (PDCP) the PHY/MAC/RLC/PDCP constitutes the radio bearer of the Uu interface user plane.
  • the MAC layer is responsible for the mapping of the logical channel to the transport channel and the multiplexing/demultiplexing process of the data, the scheduling of the underlying physical resources, and the hybrid automatic retransmission of the data packet (hybrid ARQ); the RLC layer utilizes automatic retransmission. (Automatic Repeat Request, ARQ) and other methods ensure reliable and sequential transmission of data, and complete the multiplexing/demultiplexing process of the upper layer data packet; the PDCP layer is responsible for header compression of the data packet and encryption, decryption and integrity protection of the data packet. Wait. As shown in Figure 7, The control plane is used for signaling of the control plane, that is, the signaling of the Radio Resource Control (RRC) layer.
  • RRC Radio Resource Control
  • the RRC signaling is carried on the radio bearer of the Uu interface, and the RRC layer and its The following layers are called access stratums, and the access bearers between the UE and the access network are completed. After the access is completed, the access layer can carry the non-access stratum (NAS). Signaling.
  • NAS non-access stratum
  • the network architecture of the LTE is as shown in FIG. 8.
  • the connection established by the relay and the core network is physically divided into two segments, that is, the connection between the relay and the radio side of the DeNB and the ground between the DeNB and the core network. Connection.
  • no scheme has been proposed on how the interface between the Relay, DeNB and the core network relays data, such as the interface specification, the protocol stack, and the transmission process of the data packet.
  • the technical problem to be solved by the present invention is to provide a long term evolution system and a data transmission method thereof for implementing data and signaling transmission between a relay station, an evolved base station participating in the relay, and other network elements.
  • the present invention provides a data transmission method for a long term evolution system, including:
  • the relay station performs transmission and reception processing on the user plane protocol data unit PDU transmitted between the relay station and the first network element, and the relay station includes a radio bearer protocol layer, an IP layer, a UDP layer, and a user plane GPRS tunneling protocol GTP from bottom to top. -U layer protocol stack;
  • the first network element Transmitting and receiving, by the first network element, a user plane PDU transmitted between the first network element and the relay station, where the first network element includes a physical layer and a data link L2/L1 from bottom to top Protocol stack for layer, IP layer, UDP layer and GTP-U layer;
  • the evolved base station DeNB participating in the relay forwards the data packet generated by the user plane PDU between the relay station and the first network element;
  • the relay station performs transmission and reception processing on application layer signaling transmitted between the relay station and the second network element, where the relay station includes radio bearer protocol layers, IP layers, and flow control transmission from bottom to top.
  • the protocol stack of the SCTP layer of the transmission protocol
  • the second network element performs transmission and reception processing on application layer signaling transmitted between the relay station and the second network element, where the second network element includes an L2/L1 layer, an IP layer, and an SCTP layer from bottom to top. Protocol stack; and
  • DeNB forwards the data packet generated by the application layer signaling between the relay station and the second network element.
  • the protocol stack of the radio side of the DeNB is a radio bearer protocol layer, and includes a physical layer, a media access layer, a radio link control layer, and a packet data convergence layer from bottom to top;
  • the protocol stack of the ground side of the DeNB is An L2/L1 layer, and the DeNB is configured with correspondence information between a radio bearer to the relay station and an L2/L1 protocol layer entity configured for the relay station;
  • the step of forwarding the data packet generated by the DeNB to the user plane PDU between the relay station and the first network element is:
  • the DeNB After receiving the data packet sent by the relay station to the first network element, the DeNB searches for the corresponding relationship information to determine an L2/L1 layer entity corresponding to the radio bearer, and the L2/L1 layer entity uses the L2/L1 layer entity to Forwarding the data packet to the first network element;
  • the DeNB After receiving the data packet sent by the first network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding relationship information to determine the radio bearer corresponding to the L2/L1 layer entity that transmits the data packet, and the radio bearer corresponding to the L2/L1 layer entity that transmits the data packet The data packet is forwarded to the relay station;
  • the step of forwarding, by the DeNB, the data packet generated by the application layer signaling between the relay station and the second network element is:
  • the DeNB After receiving the data packet sent by the relay station to the second network element, the DeNB searches for the corresponding relationship information to determine an L2/L1 layer entity corresponding to the radio bearer, and the L2/L1 layer entity uses the L2/L1 layer entity to Forwarding the data packet to the second network element;
  • the DeNB After receiving the data packet sent by the second network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding relationship information to determine the radio bearer corresponding to the L2/L1 layer entity that transmits the data packet, and the radio bearer corresponding to the L2/L1 layer entity that transmits the data packet The data packet is forwarded to the relay station.
  • the above data transmission method can also have the following characteristics:
  • the protocol stack of the radio side of the DeNB is a radio bearer protocol layer and an IP layer from bottom to top, wherein the radio bearer protocol layers include a physical layer, a media access layer, a radio link control layer, and packet data from bottom to top.
  • An aggregation layer the ground side of the DeNB is an L2/L1 layer and an IP layer in order from bottom to top, and the DeNB is configured with an IP routing table and has an IP router function;
  • the step of forwarding, by the DeNB, the data packet generated by the user plane PDU between the relay station and the first network element is:
  • the DeNB After receiving the data packet sent by the relay station to the first network element, the DeNB searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and specifies the L2/L1 through the route.
  • the layer entity sends the data packet to the first network element;
  • the DeNB After receiving the data packet sent by the first network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and the wireless specified by the route The bearer sends the data packet to the relay station;
  • the step of forwarding, by the DeNB, the data packet generated by the application layer signaling between the relay station and the second network element is:
  • the DeNB After receiving the data packet sent by the relay station to the second network element, the DeNB searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and specifies the L2/L1 through the route.
  • the layer entity sends the data packet to the second network element;
  • the DeNB After receiving the data packet sent by the second network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and the wireless specified by the route The bearer sends the packet to the relay station.
  • the first network element is a serving gateway S-GW of the core network
  • the second network element is a mobility management unit MME of the core network
  • the application layer signaling transmitted between the relay station and the second network element is S1.
  • the first network element and the second network element are both evolved base station eNBs, and application layer signaling transmitted between the relay station and the second network element is X2 interface application layer signaling.
  • the present invention further provides a data transmission of a long term evolution system.
  • Methods including:
  • the relay station and the radio base station of the evolved base station DeNB participating in the relay respectively use the radio bearer to implement the user plane transmitted between the first network element and the relay station by using the user plane transmission bearer for the ground side and the first network element of the DeNB, respectively.
  • Wired transmission of the PDU, the ground side of the DeNB and the first network element respectively include a physical layer and a data link L2/L1 layer, an IP layer, a UDP layer, and a user plane GPRS tunneling protocol GTP-U layer from bottom to top;
  • the DeNB transmits the user plane PDU between the radio side and the ground side by using the negotiated or configured radio bearer and the corresponding information of the user plane transmission bearer;
  • the radio side of the relay station and the DeNB respectively implements wireless transmission of application layer signaling transmitted between the relay station and the second network element by using a radio bearer or by using an RRC layer and a radio bearer, respectively;
  • the ground side of the DeNB and the second network element respectively implement wired transmission of application layer signaling transmitted between the second network element and the relay station by using a control plane transmission bearer, and the ground side and the second network element of the DeNB From bottom to top, the L2/L1 layer, the IP layer, and the flow control transport protocol SCTP layer are respectively included;
  • the DeNB transmits the data of the application layer signaling between the radio side and the ground side by using the negotiated or configured radio bearer and the corresponding information of the control plane transmission bearer.
  • the method further includes: for each service, using the radio bearer and the corresponding user plane transmission bearer, and transmitting between the relay station and the first network element User plane PDU for the service; or
  • the radio side of the relay station and the DeNB is further provided with a multiplexing and demultiplexing layer on the radio bearer protocol layer or the RRC layer; when the relay station and the radio side of the DeNB wirelessly transmit the user plane PDU, the transmitting end will The user plane PDU of one or more services is multiplexed to the radio bearer or the RRC connection, and the receiving end receives the user plane PDU received on the radio bearer or the RRC connection according to the multiplexing relationship information between each service and the radio bearer or the RRC connection. Demultiplexing, obtaining user plane PDUs of each service, The relay station and the DeNB both store the multiplexing relationship information.
  • the method when the application layer signaling of the UE is transmitted between the relay station and the second network element, the method further includes:
  • the radio side of the relay station and the DeNB is further provided with a multiplexing and demultiplexing layer on the radio bearer protocol layer or the RRC layer; when the relay station and the DeNB radio side wirelessly transmit the application layer signaling, the transmitting end will
  • the application layer signaling of the one or more user equipments UE is multiplexed to the radio bearer or the RRC connection, and the receiving end receives the application layer information received on the radio bearer according to the multiplexing relationship information between the UE and the radio bearer or the RRC connection.
  • Demultiplexing is performed to obtain application layer signaling of each UE, and the relay station and the DeNB both store the multiplexing relationship information.
  • the first network element is a serving gateway S-GW of the core network
  • the second network element is a mobility management unit MME of the core network
  • the application layer signaling transmitted between the relay station and the second network element is an S1 interface.
  • the first network element and the second network element are both evolved base station eNBs, and application layer signaling transmitted between the relay station and the second network element is X2 interface application layer signaling.
  • the present invention also provides a data transmission method for a long term evolution system, including:
  • the radio side of the relay station and the evolved base station DeNB participating in the relay respectively implements, by using the radio bearer, the user plane PDU transmitted between the first gateway and the relay station by using the user plane transmission bearer respectively for the ground side and the serving gateway of the DeNB.
  • the ground side of the DeNB and the serving gateway include a physical layer and a data link L2/L1 layer, an IP layer, a UDP layer, and a user plane GPRS tunneling protocol GTP-U layer, respectively, from bottom to top;
  • the DeNB transmits the user plane PDU between the radio side and the ground side by using the negotiated or configured radio bearer and the corresponding relationship information of the user plane transmission bearer;
  • the radio side of the relay station and the DeNB wirelessly transmits RRC signaling between the relay station and the radio side of the DeNB by using the RRC layer and the radio bearer, respectively;
  • the ground side of the DeNB and the second gateway respectively perform wired transmission of application layer signaling transmitted between the second gateway and the relay station by using a control plane transmission bearer, where the DeNB ground side and the second gateway respectively include from bottom to top.
  • the DeNB further converts and sends the RRC signaling on the radio side and the application layer signaling on the ground side;
  • the first network element is a serving gateway S-GW of the core network
  • the second network element is a mobility management unit MME of the core network
  • the application layer signaling transmitted between the relay station and the second network element is S1.
  • the first network element and the second network element are both evolved base station eNBs, and application layer signaling transmitted between the relay station and the second network element is X2 interface application layer signaling.
  • the present invention provides a long term evolution system, including a relay station, a progressive base station DeNB participating in the relay, a first network element, and a second network element.
  • the relay station is set to:
  • the user plane of the relay station includes a radio bearer protocol layer, an IP layer, and a UDP layer from bottom to top. a protocol stack of the GTP-U layer of the user plane GPRS tunneling protocol; and, at the control plane, transmitting and receiving processing of application layer signaling transmitted between the relay station and the second network element; the control plane of the relay station is from below
  • the above includes a protocol stack of a radio bearer protocol layer, an IP layer, and a stream control transport protocol SCTP layer;
  • the first network element is configured to: send and receive a user plane PDU transmitted between the first network element and the relay station by the user;
  • the user plane of the first network element includes a physical layer and a number from bottom to top According to the link stack of the L2/L1 layer, the IP layer, the UDP layer and the GTP-U layer;
  • the second network element is configured to: perform transmission and reception processing on the application layer signaling that is transmitted between the relay station and the second network element; and the control plane of the second network element includes the L2/L1 layer from bottom to top , the IP layer and the protocol stack of the SCTP layer;
  • the DeNB is set to:
  • the above long term evolution system can also have the following characteristics:
  • the user plane and the control plane protocol stack of the DeNB are radio bearer protocol layers on the radio side, L2/L1 layer on the ground side, and are configured with a radio bearer to the relay station and an L2/L1 protocol layer entity configured for the relay station.
  • Correspondence relationship information ;
  • the DeNB is further configured to:
  • the DeNB After receiving the data packet sent by the first network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding relationship information to determine a radio bearer corresponding to the L2/L1 layer entity that transmits the data packet, by using the wireless The bearer forwards the data packet to the relay station;
  • the DeNB After receiving the data packet sent by the second network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding relationship information to determine a radio bearer corresponding to the L2/L1 layer entity that transmits the data packet, by using the wireless The bearer forwards the data packet to the relay station.
  • the user plane and the control plane protocol stack of the DeNB are radio bearers in order from the bottom to the top on the radio side.
  • Each protocol layer and IP layer are L2/L1 layer and IP layer in order from bottom to top on the ground side, and an IP routing table is configured in the IP layer, which has the function of an IP router;
  • the DeNB is further configured to:
  • the radio bearer After receiving the data packet sent by the relay station to the first network element, the radio bearer searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and specifies the L2/L1 through the route.
  • the layer entity sends the data packet to the first network element;
  • the DeNB After receiving the data packet sent by the first network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and uses the route.
  • the designated radio bearer sends the data packet to the relay station;
  • the radio bearer After receiving the data packet sent by the relay station to the second network element, the radio bearer searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and specifies the L2/L1 through the route.
  • the layer entity sends the data packet to the second network element;
  • the DeNB After receiving the data packet sent by the second network element to the relay station on the L2/L1 layer, the DeNB searches for the corresponding route from the IP routing table according to the target IP address in the data packet, and uses the route.
  • the designated radio bearer sends the data packet to the relay station.
  • the first network element is a serving gateway S-GW of the core network
  • the second network element is a mobility management unit MME of the core network
  • the application layer signaling transmitted between the relay station and the second network element is S1.
  • the first network element and the second network element are both evolved base station eNBs, and application layer signaling transmitted between the relay station and the second network element is X2 interface application layer signaling.
  • the present invention further provides a long term evolution system, including a relay station, an evolved base station DeNB participating in the relay, and a first network element and a second network element.
  • the relay station is set to:
  • wireless transmission of application layer signaling transmitted between the relay station and the second network element is implemented by using a radio bearer or an RRC layer and a radio bearer connected to the radio side of the DeNB;
  • the DeNB is set to:
  • the wireless transmission of the user plane PDU transmitted between the relay station and the first network element is implemented by using the radio bearer connected to the relay station, and the relay station and the radio station are implemented by using the radio bearer connected to the relay station or the RRC layer and the radio bearer.
  • Wireless transmission of application layer signaling transmitted between two network elements is implemented by using the radio bearer connected to the relay station, and the relay station and the radio station are implemented by using the radio bearer connected to the relay station or the RRC layer and the radio bearer.
  • the wired transmission of the user plane PDU transmitted between the first network element and the relay station is implemented by using the user plane transmission bearer connected to the first network element, and the control plane transmission bearer connected to the second network element is used to implement the The wired transmission of the application layer signaling transmitted between the second network element and the relay station; and the correspondence between the negotiated or configured radio bearer and the user plane transmission bearer and the control plane transmission bearer is transmitted between the radio side and the ground side User plane PDU and application layer signaling;
  • the first network element is configured to: implement wired transmission of the user plane PDU transmitted between the first network element and the relay station by using a user plane transmission bearer connected to the ground side of the DeNB;
  • the second network element is configured to: implement wired transmission of application layer signaling transmitted between the second network element and the relay station by using a control plane transmission bearer connected to the ground side of the DeNB.
  • the above long term evolution system can also have the following characteristics:
  • the radio side of the relay station and the DeNB is also set to:
  • a multiplexing and demultiplexing layer is further disposed on each of the radio bearer protocol layers or the RRC layer;
  • the user plane PDU of one or more services is multiplexed to the radio bearer or the RRC connection at the transmitting end, and the receiving end is based on each service and the radio bearer or
  • the multiplexing relationship information between the RRC connections demultiplexes the user plane PDUs received on the radio bearer or the RRC connection to obtain user plane PDUs of each service; and the relay station and the DeNB both store the multiplexing relationship information. ; and / or
  • the radio side of the relay station and the DeNB is further provided with multiplexing on the radio bearer protocol layer or the RRC layer. And demultiplexing layer;
  • the application layer signaling of one or more user equipments UE is multiplexed to the radio bearer or the RRC connection at the transmitting end, and the receiving end is configured according to each UE.
  • the multiplexing relationship information with the radio bearer or the RRC connection demultiplexes the application layer signaling received on the radio bearer to obtain application layer signaling of each UE;
  • the relay station and the DeNB both store the multiplexing relationship information.
  • the protocol stack of the user plane transport bearer includes a physical layer, a data link L2/L1 layer, an IP layer, a UDP layer, and a user plane GPRS tunneling protocol GTP-U layer from bottom to top;
  • the protocol stack of the control plane transport bearer includes the L2/L1 layer, the IP layer, and the flow control transmission protocol SCTP layer from bottom to top;
  • the radio bearer protocol stack includes a physical layer, a media access layer, a radio link control layer, and a packet data convergence layer from bottom to top;
  • the first network element is a serving gateway S-GW of the core network
  • the second network element is a mobility management unit MME of the core network
  • the application layer signaling transmitted between the relay station and the second network element is S1.
  • the first network element and the second network element are both evolved base station eNBs, and application layer signaling transmitted between the relay station and the second network element is X2 interface application layer signaling.
  • the present invention further provides a long term evolution system, including a relay station, an evolved base station DeNB participating in a relay, a first network element, and a second network element.
  • the relay station is set to:
  • the relay station and the first control plane perform RRC signaling between the relay station and the ground side of the DeNB by using the RRC layer and the radio bearer connected to the radio side of the DeNB.
  • Wireless transmission using the radio bearer connected to the radio side of the DeNB, the relay station and the first control plane perform RRC signaling between the relay station and the ground side of the DeNB by using the RRC layer and the radio bearer connected to the radio side of the DeNB.
  • the DeNB is set to: On the wireless side, wireless transmission of the user plane PDU transmitted between the relay station and the first network element is implemented by using the radio bearer connected to the relay station, and the RRC layer and the radio bearer connected to the relay station are used between the DeNB radio side and the relay station. Performing wireless transmission of RRC signaling;
  • the wired transmission of the user plane PDU transmitted between the first network element and the relay station is implemented by using the user plane transmission bearer connected to the first network element, and is transmitted by using the application layer and the control plane connected to the second network element.
  • the first network element is configured to: implement wired transmission of the user plane PDU transmitted between the first network element and the relay station by using a user plane transmission bearer connected to the ground side of the DeNB;
  • the second network element is configured to: implement wired transmission of application layer signaling transmitted between the second network element and the relay station by using an application layer and a control plane transmission bearer connected to the ground side of the DeNB.
  • the protocol stack of the user plane transport bearer includes a physical layer, a data link L2/L1 layer, an IP layer, a UDP layer, and a user plane GPRS tunneling protocol GTP-U layer from bottom to top;
  • the protocol stack of the control plane transport bearer includes the L2/L1 layer, the IP layer, and the flow control transmission protocol SCTP layer from bottom to top;
  • the radio bearer protocol stack includes a physical layer, a media access layer, a radio link control layer, and a packet data convergence layer from bottom to top;
  • the first network element is a serving gateway S-GW of the core network
  • the second network element is a mobility management unit MME of the core network
  • the application layer is an S1 interface application layer, the relay station and the second network element The application layer signaling transmitted between the S1 interface application layer signaling; or
  • the first network element and the second network element are both evolved base station eNBs, and the application layer is an X2 interface application layer, and the application layer signaling transmitted between the relay station and the second network element is an X2 interface application layer signaling. .
  • the above wireless relay method and system can implement data and signaling transmission between a relay station, an evolved base station participating in the relay, and other network elements.
  • Figure 1 is a structural diagram of a cellular wireless communication system
  • Figure 2 is a schematic diagram of the operation of Relay in a cellular wireless communication system
  • FIG. 3 is a network architecture diagram of the LTE system
  • FIG. 4 is a schematic diagram of a protocol stack of an S1-MME interface in an LTE system
  • 5 is a schematic diagram of a protocol stack of an S1-U interface in an LTE system
  • FIG. 6 is a schematic diagram of a Uu user plane protocol stack between an eNB and a UE in an LTE system
  • FIG. 7 is a schematic diagram of a Uu control plane protocol stack between an eNB and a UE in an LTE system
  • FIG. 8 is a schematic diagram of a Uu control plane protocol stack between an LTE system and an LTE system
  • Network architecture diagram ;
  • FIG. 9 is a schematic diagram of a user plane protocol stack according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a control plane protocol stack according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a user plane protocol stack according to Embodiment 2 of the present invention.
  • FIG. 12 is a schematic diagram of a control plane protocol stack according to Embodiment 2 of the present invention.
  • FIG. 13 is a schematic diagram of a third user plane protocol stack according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of a control plane protocol stack according to Embodiment 3 of the present invention.
  • 15 is a schematic diagram of a four user plane protocol stack according to an embodiment of the present invention.
  • FIG. 16 is a schematic diagram of a control plane protocol stack according to Embodiment 4 of the present invention.
  • FIG. 17 is a schematic diagram of a control plane protocol stack according to Embodiment 5 of the present invention.
  • 18 is a schematic diagram of a protocol stack of an X2 interface in an LTE system
  • 19 is a schematic diagram of a user plane protocol stack on a Relay, a DeNB, and an eNB when the data is transmitted between the Relay, the DeNB, and the eNB according to the present invention
  • FIG. 20 is a schematic diagram of a control plane protocol stack on a Relay, a DeNB, and an eNB when the present invention is used for data transmission between a Relay, a DeNB, and an eNB.
  • control plane protocol stack and the user plane protocol stack of the connection between the Relay and the core network element use an IP-based transmission bearer, and use the radio bearer to transmit data on the connection between the Relay and the DeNB.
  • Packet on the connection between the DeNB and the core network, uses the L2/L1 protocol to transmit data packets.
  • the user plane protocol stacks of the Relay, DeNB, and S-GW are as shown in FIG. 9.
  • the user plane protocol stack on the Relay is the radio bearer protocol layer, IP layer, UDP layer and GTP-U layer from bottom to top.
  • the user plane protocol stack on the S-GW is L2/L1 layer and IP layer from bottom to top.
  • the UDP layer and the GTP-U layer, the protocol stack (also referred to as the radio side protocol stack) connected to the relay on the DeNB is a radio bearer protocol layer, and a protocol stack (also referred to as a ground side protocol stack) connected to the S-GW. It is the L2/L1 layer.
  • the radio bearer protocol layer in the text includes the PHY layer, the MAC layer, the RLC layer and the PDCP layer from the bottom up, and may also add one or more layers.
  • the transport bearers used to transmit user plane PDUs on the Relay and S-GW are the underlying protocol, IP layer, UDP layer and GTP-U layer from bottom to top.
  • the underlying protocol used between the DeNB and the S-GW is the L2/L1 protocol, and L1 is the physical layer of the terrestrial part, such as a narrowband integrated digital service subscriber loop (ISDL) and a broadband asymmetric digital subscriber line ( Asymmetric Digital Subscriber Line (ADSL), etc.; L2 is the data link layer, typically with High Level Data Link Control (HDLC) protocol and Point-to-Point Protocol (PPP). Etc., IP packets can be carried on the data link layer.
  • the underlying protocol between the DeNB and the Relay is PHY/MAC/RLC/PDCP, that is, the radio bearer is used to carry the IP layer data packets.
  • the protocol layers that pass through are the GTP-U layer, the UDP layer, the IP layer, and the radio bearer protocol layers.
  • the GTP-U layer the user plane PDU of a specific service uses its specific GTP-U tunnel, and each tunnel has a TEID.
  • Each packet carries the target TEID after being processed by the GTP-U layer.
  • the receiving S-GW can know which service packet the data packet is; the UDP layer provides the wireless access transmission service to the upper layer; the IP layer provides the network layer service, that is, completes the data packet by the network element Relay.
  • the data packet carries the IP address IPRELAY and destination of the source network element.
  • IP address of the standard network element H GW Similarly, when the S-GW wants to send the user plane PDU to the Relay, the protocol layers that pass through are GTP-U, UDP, IP, and L2/L1.
  • the DeNB When the DeNB receives the data packet that the relay sends to the S-GW through the radio bearer, it performs forwarding on the ground side, that is, through the L2/L1 protocol layer entity (such as a certain network card) corresponding to the radio bearer.
  • the S-GW forwards the data packet, and processes the L2/L1 layer, the IP layer, the UDP layer, and the GTP-U layer of the S-GW to obtain a user plane PDU.
  • the DeNB After receiving the data packet sent by the S-GW through the L2/L1 layer entity to be sent to the Relay, the DeNB forwards the data to the Relay by transmitting the radio bearer corresponding to the L2/L1 layer protocol layer entity of the data packet.
  • the packet is processed by the relay radio bearer protocol layer and IP, UDP and GTP-U to obtain the user plane PDU.
  • the control plane protocol stack is shown in Figure 10.
  • the control plane protocol stack on the Relay is the radio bearer protocol layer, IP layer and SCTP layer from bottom to top.
  • the control plane protocol stack on the MME is L2/L1 layer from bottom to top.
  • the IP layer and the SCTP layer, the protocol stack on the DeNB has been described above, and the protocol stack of the Donor eN in this embodiment may not distinguish between the user plane and the control plane.
  • the control plane transmission between the Relay and the MME replaces the UDP layer and the GTP-U layer with the SCTP layer, and is used for transmission control plane S1-AP signaling. IP and SCTP are used to complete reliable transmission between network elements.
  • the S1-AP identifier ID is used to indicate the corresponding UE.
  • the protocol layers that pass through are the SCTP layer, the IP layer, and the protocol layers of the radio bearer.
  • the protocol layers that pass through are the SCTP layer, the IP layer, and the L2/L1 layer.
  • the DeNB is consistent with the foregoing description in the process of controlling the forwarding of the data packet. After receiving the data packet sent by the relay through the radio bearer, the DeNB forwards the data packet to the MME through the L2/L1 layer entity corresponding to the radio bearer.
  • the corresponding radio bearer is found according to the L2/L1 layer entity that transmits the data packet, and the data packet is forwarded to the Relay by the radio bearer.
  • the DeNB does not care what data is carried on the underlying layer.
  • the mapping relationship between the radio bearer and the L2/L1 layer entity is configured on the DeNB, and the radio bearer to a relay corresponds to the L2/L1 layer entity configured for the relay.
  • the correspondence information may be statically configured on the DeNB, or may be predefined by the protocol, or may be determined by the Relay and the DeNB during the process of the Relay accessing the DeNB, and the like.
  • the user plane protocol stack and the control plane protocol stack on the Relay, the S-GW, and the MME are the same as those in the first embodiment, and the user plane protocol stack connected to the relay on the DeNB and The control plane protocol stack adds an IP layer to the radio bearer.
  • the user plane protocol stack connected between the DeNB and the S-GW and the control plane protocol stack connected to the MME all add an IP layer on the L2/L1 layer.
  • the DeNB in the first embodiment functions as an interface route in the network, that is, the data packet is forwarded on the radio bearer interface and its corresponding L2/L1 interface.
  • the DeNB of this embodiment also has the function of interface routing, and also has the function of an IP router.
  • the DeNB maintains an IP routing table locally, and the IP routing relationship may be statically configured on the DeNB or may be determined by the two parties during the process of accessing the DeNB.
  • the DeNB searches for the corresponding route from the local IP routing table according to the target IP address in the data packet and performs IP. Forwarding of the network. In this case, the destination of the route is the S-GW, and the DeNB forwards the data packet to the S-GW through the L2/L1 layer entity specified by the route. Similarly, after receiving the data packet sent by the S-GW through the L2/L1 layer entity to be sent to the Relay, the DeNB searches for the corresponding route from the local IP routing table according to the target IP address in the data packet. In this case, the destination of the route is Relay, and the DeNB forwards the data packet to the relay by using the radio bearer specified by the route.
  • the DeNB On the control plane, the DeNB also has the function of an IP router, which is used to complete the routing and forwarding of the control plane S1-AP signaling.
  • the forwarding process of the DeNB in controlling the data packet is basically the same as that of the user plane, except that the core network element in the route needs to be changed to the MME, and the DeNB may not care what data is carried over the IP layer.
  • the radio bearer is used between the Relay and the DeNB to transmit data carried by the transmission bearer of the S1 interface, and the control plane
  • the data is S1-AP signaling, and the data is a user plane PDU for the user plane
  • the IP-based transmission bearer is used between the DeNB and the core network to transmit data carried by the transmission bearer of the S1 interface.
  • the user plane protocol stack on the relay is a radio bearer protocol stack of each protocol layer
  • the user plane protocol stack on the S-GW is L2/L1 layer, IP layer, UDP layer, and GTP from bottom to top.
  • -U layer the user plane protocol stack connected to the relay on the DeNB is a radio bearer protocol stack of each protocol layer
  • the user plane protocol stack connected to the S-GW on the DeNB is L2/L1 layer and IP layer from bottom to top.
  • the user plane PDU is used as the data transmitted between the relay and the S-GW, and is carried on the radio bearer between the relay and the DeNB and the transport bearer between the DeNB and the S-GW.
  • the protocol stack of the radio bearer is PHY layer, MAC layer, RLC layer and PDCP layer from bottom to top, and is also represented as PHY/MAC/RLC/PDCP, and the protocol stack of the transmission bearer is L2/L1 layer from bottom to top. , IP layer, UDP layer and GTP-U layer. Corresponding relationship information of the radio bearer between the relay and the DeNB and the transmission bearer between the DeNB and the S-GW.
  • the correspondence information is saved by the DeNB, and the correspondence information is used by the relay in the process of accessing the DeNB.
  • Negotiation is obtained, for example, the relay can be specified and notified by the DeNB, or specified by the Relay and notified to the DeNB for saving.
  • the DeNB transmits the User Plane PDU and the S1-AP signal between the radio side and the ground side according to the correspondence.
  • the user plane PDU When the relay sends the user plane PDU to the S-GW, the user plane PDU is sent to the DeNB through the radio bearer. After receiving the user plane PDU sent by the relay, the radio side of the DeNB searches for the user plane transmission bearer corresponding to the radio bearer. The user plane PDU is sent to the S-GW on the user plane transport bearer. Similarly, when the S-GW sends the user plane PDU to the relay, the user plane PDU is sent to the DeNB through the user plane transmission bearer, and the DeNB receives the user plane PDU sent by the S-GW, and then searches for the user plane PDU. Transmitting a radio bearer corresponding to the bearer, and transmitting the user plane PDU to the relay on the radio bearer.
  • the protocol stack of the control plane is shown in Figure 14.
  • the control plane protocol stack connected to the MME on the DeNB and the control plane protocol stack on the MME are L2/L1 layer, ⁇ layer and SCTP layer, L2/L1 from bottom to top.
  • the layer, layer and SCTP layer constitute the transmission bearer of the control plane between the DeNB and the MME.
  • the control plane protocol stack connected to the Relay on the Relay and the DeNB can be selected in two ways: The first one is to use the radio bearer protocol stack, and the PHY layer, the MAC layer, the RLC layer and the PDCP layer are in order from bottom to top.
  • the S1-AP signaling transmission is consistent with the transmission of the user plane PDU described in this embodiment, and is shown in the figure.
  • the second one is the RRC layer and the radio bearer.
  • the bottom to the top are the PHY layer, the MAC layer, the RLC layer, the PDCP layer and the RRC layer.
  • the S1-AP signaling is transmitted by the RRC connection. It may be an uplink or downlink direct transmission message of the RRC or a new RRC message.
  • the S1-AP signaling is first sent to the DeNB through the radio bearer (or the RRC layer and the radio bearer), and the DeNB radio side receives the S1-AP message sent by the relay.
  • the control plane transmission bearer corresponding to the radio bearer or RRC connection
  • the S1-AP signaling is sent to the MME on the control plane transmission bearer.
  • the MME sends the S1-AP signaling to the Relay
  • the S1-AP signaling is sent to the DeNB through the control plane transmission bearer
  • the DeNB receives the S1-AP signaling.
  • the radio bearer (or RRC connection) corresponding to the user plane transport bearer is searched, and the S1-AP signaling is sent to the relay on the radio bearer.
  • the protocol stack of the DeNB user plane and the control plane transport bearer can share the ground side resources with the protocol stack of the original S1 interface, or can use different resources, that is, one part is used by the relay, and the other part is used by the DeNB.
  • the S-GW and the MME consider that the Relay and the DeNB are the same network element.
  • resources assigned to the Relay such as TEID and S1-AP ID, can be allocated independently of the DeNB.
  • the protocol stack of the user plane in this embodiment is as shown in FIG. 15.
  • the difference from the third embodiment is that the user plane protocol stack on the Relay and the DeNB is on the radio bearer, and a service multiplexing and demultiplexing layer is added (mux/ Demux ) , if there is an RRC layer on the radio bearer, a multiplexing and demultiplexing layer is added to the RRC layer.
  • the user plane PDU Before the user plane PDU is carried to the radio bearer, it will first pass through the service multiplexing and demultiplexing layer.
  • the function is to multiplex the services of different UEs according to the specified principle, and then carry them to the radio bearer, for example, the QoS service can be recovered. And then, these services are carried to the same radio bearer, avoiding the limitation that one transport bearer in Embodiment 3 must correspond to one radio bearer.
  • the DeNB After receiving the user plane PDU sent by the S-GW through the user plane transmission bearer to be sent to the Relay, the DeNB multiplexes the user plane PDU of one or more services to a radio bearer and sends the message to the relay, and saves the user corresponding to each service.
  • Surface transmission bearer and multiplexing relationship between each service and radio bearer For example, the service a-1 and a-2 carrying the user a and the service b1 of the user b can be multiplexed on the user plane bearer X.
  • the Relay also needs to save the multiplexing relationship information, which may be negotiated by the DeNB and the Relay or notified by the DeNB or notified by the Relay.
  • the relay demultiplexes the user plane PDUs received on the radio bearer in the multiplexing and demultiplexing layer according to the multiplexing relationship information, to obtain user plane PDUs of each service.
  • the relay sends the user plane PDU to the S-GW
  • the user plane PDU of one or more services is multiplexed into one radio bearer and sent to the DeNB
  • the relay and the DeNB store the multiplexing relationship information between each service and the radio bearer.
  • the DeNB demultiplexes the user plane PDUs received on the radio bearer by the multiplexing and demultiplexing layer according to the multiplexing relationship information, and obtains user plane PDUs of each service, and then according to the correspondence between the service and the user plane transmission bearer.
  • the user plane PDU of each service is sent to the S-GW through the transport bearer corresponding to each service.
  • the protocol stack of the control plane of this embodiment is as shown in FIG. 16.
  • the difference from the third embodiment is that the control plane protocol stack connected to the relay on the Relay and the DeNB is on the radio bearer, and a service multiplexing and demultiplexing layer is added.
  • the multiplexing and demultiplexing process is similar to the user plane, except that the Relay and the DeNB reuse the S1-AP signaling of one or more user equipments (UEs) when multiplexing.
  • UEs user equipments
  • the relay and the DeNB shall store the multiplexing relationship information between each UE and the radio bearer, and the DeNB also stores the correspondence between each UE and the control plane transmission bearer. The specific process is not repeated here.
  • the control plane protocol stack connected to the Relay on the Relay and the DeNB can also be selected in two ways.
  • the protocol stack of the radio bearer is used.
  • the S1-AP signaling transmission of the control plane is consistent with the transmission of the user plane PDU, and the S1-AP signaling is treated as a special service.
  • the control plane protocol stack connected to the relay on the DeNB and the control plane protocol stack on the Relay use the RRC layer and the radio bearer, the S1-AP signaling is carried by the RRC signaling, since each UE has only one S1-AP connection. Therefore, it is sufficient to carry the UE-specific identifier on the RRC layer.
  • the protocol stack of the user plane in this embodiment is the same as the corresponding processing and the third embodiment, and the Relay and the DeNB are the same.
  • the control plane protocol stack of the MME and the MME is shown in Figure 17.
  • the control plane protocol stack connected to the Relay on the Relay and DeNB uses the RRC layer and the radio bearer shown in Figure 7, and the protocol stack (PHY) of the radio bearer from bottom to top. /MAC/RLC/PDCP) and RRC layer.
  • the RRC part is responsible for the S1-AP connection and the negotiation process of the transport bearer established on the DeNB.
  • the control plane protocol stack connected to the MME on the MME and the DeNB is L2/L1 layer, ⁇ layer, SCTP layer and S1-AP layer from bottom to top.
  • the relay is used as the cell management under the DeNB. After receiving the RRC signaling sent by the DeNB to the MME, the DeNB radio side transmits the S1-AP signaling to the MME from the ground side. After receiving the S1-AP signaling sent by the MME to the Relay, the DeNB sends the RRC signaling between the relay and the Relay to the Relay from the radio side.
  • the protocol stack of the DeNB control plane transport bearer may share the ground side resources with the protocol stack of the original S1 interface, or may use different resources separately.
  • the solution of all the foregoing embodiments is equally applicable to data transmission between the Relay, the DeNB, and the eNB.
  • the user plane protocol stack of the X2 interface between the eNBs is the same as the S1-U interface, and the control plane protocol stack of the X2 interface is as shown in the figure. As shown in FIG. 18, it is the same as the S1-MME interface, except that the transmitted signaling is X2-AP signaling.
  • the user plane only needs to change the S-GW in the scheme to the eNB.
  • the MME in the scheme is only changed to the eNB, and the S1-AP signaling is changed to X2-AP signaling is sufficient.
  • a schematic diagram of the corresponding protocol stack is shown in Figures 19 and 20.
  • the wireless relay method and system of the present invention can implement data and signaling transmission between a relay station, an evolved base station participating in the relay, and other network elements.

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Abstract

L'invention porte sur un système d'évolution à long terme et sur un procédé de transmission de données. Sur un plan utilisateur, une station relais envoie et reçoit des unités de données de protocole (PDU) de plan utilisateur, transmises entre la station relais et un premier élément de réseau; le premier élément de réseau envoie et reçoit des PDU de plan utilisateur transmises entre le premier élément de réseau et la station relais, et une station de base évoluée (DeNB), qui participe au relais, transmet des paquets de données, générés à partir des PDU de plan utilisateur, entre la station relais et le premier élément de réseau; sur un plan de commande, la station relais envoie et reçoit une signalisation de couche d'application, transmise entre la station relais et un second élément de réseau; le second élément de réseau envoie et reçoit la signalisation de couche d'application transmise entre le second élément de réseau et la station relais; et la DeNB transmet des paquets de données, générés à partir de la signalisation de couche d'application, entre la station relais et le second élément de réseau. La transmission de données et de signalisation entre la station relais, la station de base évoluée qui participe au relais et d'autres éléments de réseau, peut être mise en œuvre avec l'invention.
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