WO2016106744A1

WO2016106744A1 - Data transmission method, wireless access device and communication system

Info

Publication number: WO2016106744A1
Application number: PCT/CN2014/096054
Authority: WO
Inventors: 彭文杰; 罗海燕; 张宏卓
Original assignee: 华为技术有限公司
Priority date: 2014-12-31
Filing date: 2014-12-31
Publication date: 2016-07-07
Also published as: CN107113595A

Abstract

The embodiments of the present invention provide a data transmission method, a wireless access device and a communication system, wherein the wireless access device is used for connecting a user equipment to a wired network in a wireless manner; the wireless access device includes a transceiving unit and a processing unit; the processing unit is used for encapsulating a first interface data packet; the payload of the first interface data packet includes N first payload data packets, N is an integer greater than or equal to 1; the header of the first interface data packet at least includes information for indicating the amount of the first payload data packets; and the transceiving unit is used for transmitting the first interface data packet to another wireless access device through an interface between the transceiving unit and the another wireless access device. The provided data transmission method, wireless access device and communication system enable the transmission of multiple payload data packets in a single interface data packet, thus improving the transmission efficiency.

Description

Data transmission method, wireless access device and communication system

Technical field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method, a wireless access device, and a communication system.

Background technique

The dual-connection technology is one of the most discussed technologies. The technology can separate the user plane and the control plane in the architecture design. The user plane can improve the user throughput performance by aggregating the wireless resources of different base stations.

In the dual connectivity technology, the transmission efficiency between different base stations is currently low, and how to improve the transmission efficiency between different base stations is an urgent problem to be solved.

Summary of the invention

The embodiments of the present invention provide a data transmission method, a wireless access device, and a system, which are used to improve transmission efficiency between different wireless access devices.

In a first aspect, an embodiment of the present invention provides a wireless access device, where a wireless access device is configured to access a user equipment to a wired network by using a wireless device, where the wireless access device includes a transceiver unit and a processing unit, and the processing unit uses Encapsulating a first interface data packet, the payload of the first interface data packet includes N first payload data packets, where N is an integer greater than or equal to one, and a header of the first interface data packet includes at least Information indicating the number of the first payload data packet; the transceiver unit is configured to send the first interface data packet to the another wireless access device by using an interface with another wireless access device.

By including the information of the number of payload data packets in the interface data packet, more than one payload can be transmitted with another wireless access device if the length of the payload data packet carried in the interface data packet is consistent. Packets to improve transmission efficiency.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the header of the first interface data packet may further include, by using at least N-1 first payload data packets, of the N Each one Length information.

By further including, in the interface data packet, information indicating the length of each of at least N-1 first payload data packets of N, regardless of whether each payload data packet length is consistent or not To achieve more than one payload packet transmission with another wireless access device, thereby improving transmission efficiency.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the information used to indicate the quantity of the first payload data packet is a domain, Filled in the total number N of the first payload data packets; or,

The information indicating the number of the first payload data packets is N domains, and each domain indicates that there is a corresponding first payload data packet, and different domains correspond to different first payload data packets.

In combination with the first aspect or the first or second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the information is used to indicate at least N-1 first of the N The information of the length of each of the payload data packets is N-1 domains, each domain represents the length of a corresponding first payload data packet, and the different domains correspond to different first payload data packets, or

The information indicating the length of each of at least N-1 first payload data packets of the N is N domains, each domain indicating a length of a corresponding first payload data packet, different domains Corresponding to different first payload data packets.

With reference to the first aspect, or the first, second or third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the first payload data packet is sent to the user Information about the device, or, including information received from the user device.

In conjunction with the first aspect or any one of the first to the fourth aspects of the first aspect, in a fifth possible implementation manner of the first aspect, the transceiver unit is further configured to communicate with another wireless access The interface between the devices receives a second interface data packet from the another wireless access device, and the payload of the second interface data packet includes S second payload data packets, where S is an integer greater than or equal to one. The header of the second interface data packet includes at least information indicating the number of the second payload data packet;

The processing unit is further configured to parse the second interface data packet according to the information carried in the second interface data packet header to indicate the quantity of the second payload data packet, to obtain the S second payload data. package.

In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation manner of the first aspect, the header of the second interface data packet further includes at least S-1 The information of the length of each of the second payload data packets, the processing unit is further configured to use the information carried in the header of the second interface data packet to indicate the quantity of the second payload data packet and to indicate S The information of the length of each of at least S-1 second payload data packets is analyzed for the second interface data packet to obtain S second payload data packets.

With reference to the first aspect or any one of the first to the sixth aspects of the first aspect, in a seventh possible implementation manner of the first aspect, the base station is a base station in a cellular communication network, or Access point in a local area network (WLAN).

In a second aspect, an embodiment of the present invention provides a communication system, including a first wireless access device and a second wireless access device connected through an interface, where the first wireless access device and the second wireless access device are both used Wirelessly connecting user equipment to a wired network, where

a first wireless access device, configured to send, by using the interface, an interface data packet to the second wireless access device, where the payload of the interface data packet includes N payload data packets, where N is an integer greater than or equal to one, The header of the first interface data packet includes at least information indicating the number of the payload data packet; and

a second wireless access device, configured to receive the interface data packet by using the interface, and parse the interface data packet according to the information carried in the interface packet header for indicating the quantity of the payload data packet, to obtain N Payload data package.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the header of the interface data packet further includes a length indicating each of at least N-1 payload data packets of the N Information, the second wireless access device may be further configured to use information for indicating the number of the payload data packets and information for indicating the length of each of the N at least N-1 payload data packets The interface packet is parsed.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the information used to indicate the quantity of the payload data packet is a domain, and is filled with The total number of payload data packets N; or,

The information used to indicate the number of payload data packets is N domains, each domain indicating that there is a corresponding payload data packet, and different domains correspond to different payload data packets.

With reference to the second aspect or the first or second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the indication is used to indicate at least N-1 payloads of the N The information of the length of each data packet is N-1 domains, each domain represents the length of a corresponding payload data packet, and different domains correspond to different payload data packets, or

The information indicating the length of each of at least N-1 payload data packets of the N is N domains, each domain represents a length of a corresponding payload data packet, and different domains correspond to different nets. Load data packet.

With reference to the second aspect or any one of the first to the third aspects of the second aspect, in a fourth possible implementation manner of the second aspect, the first wireless access device is a source in a handover scenario a base station, where the second radio access device is a target base station in a handover scenario; or

The first wireless access device and the second wireless access device are wireless access devices in a dual connectivity scenario.

With reference to the second aspect, or any one of the first to fourth possible implementation manners of the second aspect, in the fifth possible implementation manner of the second aspect, the first wireless access device and the second wireless access The device is a base station in a cellular communication network, or the first wireless access device is a base station in a cellular communication network, the second wireless access device is an access point in a WLAN, or the first wireless access The device is an access point in the WLAN, and the second wireless access device is a base station in a cellular communication network.

In a third aspect, an embodiment of the present invention provides a data transmission method, including:

The second wireless access device receives an interface data packet from the first wireless access device by using an interface with the second wireless access device, where the payload of the interface data packet includes N payload data packets, where N is An integer greater than or equal to one, the header of the interface data packet includes at least information indicating the number of the payload data packets;

The second radio access device parses the interface data packet according to the information carried in the interface packet header for indicating the number of the payload data packet, and obtains N payload data packets.

In conjunction with the third aspect, in a first possible implementation of the third aspect, the interface data packet The header further includes information indicating a length of each of at least N-1 payload data packets of the N, the second wireless access device being further operative to indicate the number of the payload data packets Information and an information indicating the length of each of at least N-1 payload data packets of the N are parsed for the interface data packet.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the information indicating the quantity of the payload data packet is a domain, and is filled with The total number of payload data packets N; or,

With reference to the third aspect or the first or second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the method is used to indicate at least N-1 payloads of the N The information of the length of each data packet is N-1 domains, each domain represents the length of a corresponding payload data packet, and different domains correspond to different payload data packets, or

With reference to the third aspect, or any one of the first to the third possible implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect, the first wireless access device is in a handover scenario a source base station, where the second radio access device is a target base station in a handover scenario; or

With reference to the third aspect, or any one of the first to fourth possible implementation manners of the third aspect, in a fifth possible implementation manner of the third aspect, the first wireless access device and the second wireless interface The ingress device is a base station in a cellular communication network, or the first wireless access device is a base station in a cellular communication network, the second wireless access device is an access point in a WLAN, or the first wireless connection The ingress device is an access point in the WLAN, and the second radio access device is a base station in a cellular communication network.

In a fourth aspect, the embodiment of the present invention further provides an X2 interface user plane protocol frame format, including a PDU. The type and the X2-U sequence number further include information indicating the number of data packets included in the payload, wherein the number of data packets included in the payload is N. The data packet included in the payload can be a PDU or an SDU.

The X2 interface is an interface between two base stations in a cellular communication network. It is a logical interface and can be either a wired interface or a wireless interface.

The X2 interface user plane protocol frame format can be used for both downlink data transmission and uplink data transmission. When the PDU is included in the frame format, it is applied to the dual-connection scenario, including the SDU, and is applied to the switching scenario.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the information for indicating a length of each of the N at least N-1 data packets is further included.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the information used to indicate the quantity of the data packet included in the payload is a domain, There is a total number N of the data packets; or,

The information used to indicate the number of data packets included in the payload is N domains, each domain indicating that there is one corresponding data packet, and different domains correspond to different data packets.

With reference to the fourth aspect, or the first or the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the The information of the length of each packet is N-1 domains, each domain represents the length of a corresponding data packet, and different domains correspond to different data packets, or,

The information for indicating the length of each of at least N-1 data packets of the N is N domains, each domain represents a length of a corresponding data packet, and different domains correspond to different data packets.

In a fifth aspect, an embodiment of the present invention further provides an Xw interface user plane protocol frame format, including information for indicating a quantity of data packets included in a payload, where the number of data packets included in the payload is N, can be a PDU. The Xw interface is a logical interface between the base station in the cellular communication network and the access point in the WLAN network, and may be a wired interface or a wireless interface.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the information for indicating a length of each of the N at least N-1 data packets is further included.

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the information used to indicate the quantity of the data packet included in the payload is a domain, There is a total number N of the data packets; or,

With reference to the fifth aspect, or the first or the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the method is used to indicate at least N-1 data of the N The information of the length of each packet is N-1 domains, each domain represents the length of a corresponding data packet, and different domains correspond to different data packets, or,

The data transmission method, the wireless access device, and the communication system provided by the embodiment of the present invention, and the frame format, by carrying the information related to the payload data packet carried in the interface data packet in the interface data packet, enable the data to pass through one interface. More than one payload packet can be transmitted in the packet, which improves transmission efficiency.

For ease of understanding, a description of some of the concepts related to the present invention is given by way of example. As follows:

Third Generation Partnership Project (English: 3 ^rd generation partnership project, referred to as 3GPP) is a wireless communications network dedicated to the development of the project. Generally, a 3GPP related organization is referred to as a 3GPP organization.

A wireless communication network is a network that provides wireless communication functions. The wireless communication network may use different communication technologies, such as code division multiple access (CDMA), wideband code division multiple access (WCDMA), time division multiple access (English: time) Division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency-division multiple access (OFDMA), single carrier frequency division Multiple access (English: single carrier FDMA, referred to as: SC-FDMA), carrier sense multiple access / collision avoidance (English: Carrier Sense Multiple Access with Collision Avoidance). According to the capacity, rate, delay and other factors of different networks, the network can be divided into 2G (English: generation) network, 3G network or 4G network. A typical 2G network includes a global system for mobile communications/general packet radio service (GSM) network or a general packet radio service (GPRS) network. A typical 3G network is used. The network includes a universal mobile telecommunications system (UMTS) network. A typical 4G network includes a long term evolution (LTE) network. The UMTS network may also be referred to as a universal terrestrial radio access network (UTRAN). The LTE network may also be referred to as an evolved universal terrestrial radio access network (English: evolved universal terrestrial) Radio access network, referred to as E-UTRAN. According to different resource allocation methods, it can be divided into a cellular communication network and a wireless local area network (English: wireless local area networks, WLAN for short), wherein the cellular communication network is dominated by scheduling, and the WLAN is dominant. The aforementioned 2G, 3G and 4G networks are all cellular communication networks. It should be understood by those skilled in the art that as the technology advances, the technical solutions provided by the embodiments of the present invention are equally applicable to other wireless communication networks, such as 4.5G or 5G networks, or other non-cellular communication networks. For the sake of brevity, embodiments of the present invention sometimes refer to a wireless communication network as a network.

The cellular communication network is a type of wireless communication network, which adopts a cellular wireless networking mode, and is connected between the terminal device and the network device through a wireless channel, thereby enabling users to communicate with each other during activities. Its main feature is the mobility of the terminal, and it has the function of handoff and automatic roaming across the local network.

User equipment (English: user equipment, abbreviated as UE) is a terminal device, which can be a mobile terminal device or a non-mobile terminal device. The device is mainly used to receive or send business data. User equipment can be distributed in the network. User equipments have different names in different networks, such as: terminals, mobile stations, subscriber units, stations, cellular phones, personal digital assistants, wireless modems, wireless communication devices, handheld devices, knees. Upper computer, cordless phone, wireless local loop station, etc. The user equipment can communicate with one or more core networks via a radio access network (RAN) (access portion of the wireless communication network), for example, with a radio access network. Change voice and / or data.

A base station (English: base station, BS for short) device, also referred to as a base station, is a device deployed in a wireless access network to provide wireless communication functions. For example, a device that provides a base station function in a 2G network includes a base transceiver station (BTS) and a base station controller (BSC), and a device that provides a base station function in a 3G network. Including the Node B (abbreviation: NodeB) and the radio network controller (English: radio network controller, RNC for short), the device providing the base station function in the 4G network includes the evolved Node B (English: evolved NodeB, eNB for short) In the WLAN, the device that provides the function of the base station is an access point (English: Access Point, abbreviated as AP).

Dual connectivity (English: dual connectivity, abbreviated as DC) refers to an RRC (English: radio resource control) connected state UE obtains radio resources from at least two different network nodes, and There is a non-ideal delay in the connection between these two network nodes.

The primary base station (English: master BS, abbreviated as MBS) refers to a base station that is connected to the mobility management network element and is responsible for mobility management of the UE in a dual connectivity scenario. In the dual connectivity scenario, the control plane that communicates with the UE is deployed in the primary base station, and the traffic and aggregation of the service data of the user plane is also implemented in the primary base station. In an LTE network, the primary base station is the primary eNB (English: master eNB, MeNB for short).

A secondary BS (English: secondary BS, SBS for short) refers to a BS that provides additional radio resources for the UE in addition to the MBS in a dual connectivity scenario. In an LTE network, the secondary base station is a secondary eNB (SeNB), and in the WLAN, the secondary base station is an AP.

The mobile management network element (English: mobile management network element, MMNE for short) is a device deployed in the core network for mobility management of the UE. For example, in a 2G or 3G network, the mobility management network element includes a GPRS service support node (English: serving GPRS support node, SGSN for short). In the 4G network, the mobility management network element includes a mobility management entity (English: mobility management entity, Abbreviation: MME).

The X2 interface is an interface between two base stations in a cellular communication network defined in the current 3GPP protocol, and its transmission protocol complies with the GPRS Tunneling Protocol user plane protocol.

GPRS tunneling protocol-user plane (English: GPRS tunneling protocol-user plane, referred to as: GTP-U) is a relatively simple IP-based tunneling protocol that allows transceivers to communicate over multiple tunnels.

X2 interface user plane (English: X2-User plane, referred to as X2-U). The X2 interface is used to transmit user plane information between base stations. The main protocol used is GTP-U protocol.

The X2 interface application protocol (English: X2 Application protocol, referred to as X2-AP) is the protocol used for message transmission on the X2 interface control plane.

The network protocol (English: Internet Protocol, IP for short) is a protocol designed to communicate with each other for computer networks. In the Internet, it is a set of rules that enable all computer networks connected to the network to communicate with each other, and stipulates the rules that computers should follow to communicate on the Internet.

The packet data convergence protocol (PDCP) layer belongs to the second layer of the radio interface protocol stack, and processes the radio resource management (RRC) message on the control plane and the Internet protocol (IP) on the user plane. package. On the user plane, after receiving the IP data packet from the upper layer, the PDCP layer performs header compression and encryption on the IP data packet, and then delivers it to the RLC layer. The PDCP layer also provides sequential delivery and repeated monitoring functions to the upper layer. On the control plane, the PDCP layer provides signaling transmission services for the upper layer RRC, implements encryption and consistency protection of RRC signaling, and implements decryption and consistency check of RRC signaling in the reverse direction.

The radio link control (English: radio link control, RLC) layer is located between the PDCP layer and the MAC layer to provide segmentation and retransmission services for user plane and control plane data.

The service data unit (English: service data unit, SDU), also known as the service data unit, is transmitted from the information unit of the higher layer protocol to the lower layer protocol. The service data unit SDU of this layer has a one-to-one correspondence with the protocol data unit (English: protocol data unit, PDU for short). Data that enters each layer of unprocessed data is called a Service Data Unit (SDU), and data that is processed in this layer to form a specific format is called a Protocol Data Unit (PDU). At the same time, the PDU formed by this layer is the SDU of the next layer.

Wireless Local Area Networks (English: Wireless Local Area Networks, WLAN for short) refers to a local area network that uses radio waves as a data transmission medium. The transmission distance is generally only a few tens of meters.

An access point (English: Access Point, AP for short) connects to a wireless network and can also be connected to a wired network device. It can be used as an intermediary point to connect wired and wireless Internet devices to each other and transmit data.

The evolved packet system (English: Evolved Packet System, abbreviated as: EPS) bears, uniquely identifies a data stream. This data stream has the same between the UE and the PDN gateway (English: Public-Data-Network GateWay, P-GW for short). Quality of Service (English: Quality of Service, referred to as: QoS).

Service Gateway (English: Serving Gateway, S-GW for short) is an important gateway in the EPS core network. It is responsible for routing and forwarding user data packets. It is also responsible for UEs in 3GPP technology network nodes such as eNodeB or in LTE. Exchange of user plane data when moving between the network and other 3GPP technology networks.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

FIG. 1 is a schematic structural diagram of a 4G LTE network according to an embodiment of the present disclosure;

2 is a schematic diagram of an X2 interface user plane protocol stack according to an embodiment of the present invention;

3 is a schematic diagram of a dual connectivity scenario according to an embodiment of the present invention;

4 is a schematic diagram of a scheme for implementing offloading in a PDCP layer according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of operations of a MeNB forwarding a PDCP PDU to an SeNB according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an X2 interface user plane protocol frame format of downlink user data according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a PDCP layer convergence in a dual connectivity uplink scenario according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of splitting a PDCP layer in a cellular communication network and a WLAN DC scenario according to an embodiment of the present disclosure;

FIG. 9 is a schematic block diagram of a data transmission method according to an embodiment of the present invention;

FIG. 10 is a schematic block diagram of a wireless access device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

The network architecture and the service scenario described in the embodiments of the present invention are used to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention. The technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

The following describes the scenario of a 4G network in a wireless communication network as an example.

Figure 1 shows a 4G LTE network architecture. As can be seen from the figure, there is an X2 interface between eNBs. The X2 interface supports signaling interaction between two eNBs, and supports sending PDUs to corresponding tunnel end nodes. The X2 interface protocol architecture consists of two layers: the wireless network layer and the transport network layer. The wireless network layer is separated from the transport network layer, and the wireless network layer defines a related procedure for inter-eNB interoperation, which is composed of a wireless network layer control plane and a user plane. The transport network layer provides transport services for the signaling of the control plane and the data of the user plane. The X2 interface protocol consists of two parts: the wireless signaling protocol (X2-AP protocol) and the user plane protocol (GTP-U protocol). The X2 interface user plane protocol stack is shown in Figure 2, including GTP-U, UDP (Chinese: User Datagram Protocol, English: User Datagram Protocol), IPv6 and/or IPv4 (Sixth Edition Internet Protocol and/or Fourth Edition Internet) Protocol), a data link layer and a physical layer. The transport network layer performs IP-based data stream transmission based on the GTP-U protocol through the X2 interface.

The dual connectivity technique allows one UE to simultaneously obtain radio resources from at least two network nodes, wherein the radio resources are used to transmit traffic data between the UE and the network node. Taking the LTE network as an example, as shown in FIG. 3, there are a primary base station MeNB and a secondary base station SeNB in the network, and the two are connected through an X2 interface, and the UE can To obtain radio resources from the MeNB and the SeNB at the same time, it is also possible to obtain radio resources only from the MeNB. In the scenario that the UE obtains radio resources from the MeNB and the SeNB at the same time, after the EPS bearer 2 is sent from the upper layer network element, such as the S-GW, to the MeNB, the MeNB performs offloading, and forwards some or all of the data packets in the EPS bearer 2. To the SeNB, the UE is forwarded by the SeNB, and the remaining data packets of the EPS bearer 2 are still sent by the MeNB to the UE; the UE simultaneously receives part of the data packet of the EPS bearer 2 sent by the MeNB and part of the data packet of the EPS bearer 2 forwarded by the SeNB. The EPS bearer 1 is not offloaded and is sent by the MeNB to the UE.

The application of dual connectivity technology can effectively improve the throughput of the UE and the capacity of the system.

In the first embodiment of the present invention, the downlink transmission in the dual connectivity technology is taken as an example. In a specific implementation, as shown in FIG. 4, the solution implements the offloading operation in the PDCP layer of the MeNB: the user data arrives from the upper layer network element to the PDCP layer of the MeNB, and the PDCP layer of the MeNB encapsulates the data to form a PDCP PDU; The PDCP PDUs are distributed according to at least one of the network load and the link status of the MeNB and the SeNB, and are respectively sent to the RLC layer corresponding to the MeNB's own PDCP and the SeNB. If the scheme shown in FIG. 4 is based on an LTE network, the Xn interface is an X2 interface, that is, the MeNB sends at least one PDCP PDU to the SeNB through the X2 interface. In all embodiments of the present invention, a packet transmitted on the X2 interface is referred to as an X2-U packet, and since its transmission protocol complies with the GTP-U protocol, it may also be referred to as a GTP-U packet. The GTP-U packet may include a GTP-U Header, a GTP-U Extension Header, and a payload. The GTP-U Header format is fixed and usually indicates in its last byte whether there is a GTP-U Extension Header and a GTP-U Extension Header type. The X2-U package can include a header and a payload.

An operation in which the MeNB forwards PDCP PDUs to the SeNB is defined in 3GPP TS 36.425. As shown in FIG. 5, the MeNB sends at least one PDCP PDU to the SeNB, and encapsulates the at least one PDCP PDU into an X2-U packet by using a GTP-U protocol, and allocates an X2-U sequence for the X2-U packet. The number is identified. The DL USER DATA (downlink user data) in FIG. 5 is the X2-U packet, which is an X2 interface user plane protocol frame format defined by the MeNB in the dual connection forwarding the downlink PDCP PDU to the SeNB. 6 is a frame format specific to the downlink PDCP PDU defined on the X2 interface, and is referred to as DL USER DATA (PDU Type 0) Format in the standard, in all embodiments of the present invention. X2 interface user plane protocol frame called downlink user data format. The frame format includes PDU Type, spare (reserved bit) and X2-U Sequence Number. The PDU Type (=0) (type) indicates that the PDU Type value is 0000, the X2-U packet type is downlink user data (DL USER DATA), and the X2-U sequence number is the corresponding X2-U packet allocated by the MeNB. The number, spare is a reserved bit, which can be written as 0 by the sender, and the receiver can not be resolved. The Spare extension in Figure 6 is an extended reserved bit, which is the last 0-4 bytes of the header, and is used to satisfy the limitation of the length of the X2-U packet header in the TS 36.425 protocol, that is, the length of the X2-U packet header is An integer multiple of 4 bytes.

After the MeNB determines the header of the X2-U packet, at least one PDCP PDU that needs to be forwarded is encapsulated in the X2-U packet as the payload of the X2-U packet. After receiving the downlink user data (that is, the X2-U packet), the SeNB can parse the PDCP PDU according to the PDU Type field and forward the PDCP PDU to the UE. The existing frame format design can only support the case where the MeNB transmits only one PDCP PDU to the SeNB through one X2-U packet. Even if one X2-U packet carries more than one PDCP PDU, the receiver SeNB cannot correctly perform the same. Parsing, resulting in low transmission efficiency between the MeNB and the SeNB. Embodiments of the present invention provide a method in which an X2 interface user plane protocol frame format of downlink user data is modified to include a field (also referred to as a domain) related to transmitting one or more PDCP PDUs. Therefore, the MeNB and the SeNB can not only carry more than one PDCP PDU in one X2-U packet, but also enable the receiver to perform X2-U packet parsing according to the definition, so as to correctly parse the X2-U packet to carry More than one PDCP PDU.

Optionally, the manner of modifying the X2 interface user plane protocol frame format of the downlink user data may be any one of the following three types:

The first way to modify the way:

If all the PDCP PDU sizes (also referred to as lengths) that the MeNB forwards to the SeNB are set to be the same, the domain may be added only in the header of the X2-U packet to indicate the number of PDCP PDUs in the payload. You can use the spare bit or use the undefined part of the current frame format. For example, as shown in Table 1, the modification of the downlink user data X2 interface user plane protocol frame format defined in the TS 36.425 protocol includes: adding a PDCP PDU number indication field Number of PDCP PDU in the X2-U packet header, Used to indicate how many PDCP PDUs are in the payload. In this example, the quantity indicates the domain As a byte followed by the X2-U Sequence Number, it is understood that it is not limited to this.

Table 1 modified downlink user data X2 interface user plane protocol frame format

For example, if the MeNB has three 1000-byte PDCP PDUs to be forwarded to the SeNB, the MeNB writes the number of forwarded PDCP PDUs into the PDCP PDU number indication field when the MeNB is grouped, such as 3 in the form of a binary number. The 00000011 write PDCP PDU number indicates that the payload of the formed X2-U packet is 3000 bytes.

After receiving the X2-U packet, the SeNB parses the number of PDCP PDUs from the header of the X2-U packet to 3, and then reads the payload of the X2-U packet, splits it, and parses out three sizes of 1000 words. Section of the PDCP PDU.

It is understandable that:

1) The PDCP PDU number indication field can be anywhere in the header.

2) The PDCP PDU number indication field is not limited to the binary number in the above example. It can also be expressed in other ways, and is not limited to one byte in the above example. It can be other ways, such as 2 bytes (Byte ), or 10 bits (Bit), to satisfy the head in byte-aligned manner. For example, if the number of the PDCP PDU is 10000000, the value of the number of the PDCP PDU is 10000000, the value of the PDCP PDU is 11000000, and the value of the PDCP PDU is 11111111 11000000.

In this manner, based on the frame format defined by the TS 36.425 protocol, the PDCP PDU number indication field Number of PDCP PDU is added. In this manner, the number of PDCP PDUs in the payload of the X2-U packet can be effectively identified, thereby instructing the SeNB to efficiently parse the X2-U packet to obtain PDCP PDUs of equal sizes.

The second way of modification:

This method is an improvement in the foregoing first manner, and the method can be applied to the MeNB to the SeNB regardless of whether the size of the PDCP PDU forwarded by the MeNB to the SeNB is consistent. A scenario in which the size of the PDCP PDUs is consistent may also be applied to a scenario in which the size of the PDCP PDUs forwarded by the MeNB to the SeNB is inconsistent.

Specifically, a PDCP PDU number indicating domain Number of PDCP PDU is added in the header of the X2-U packet to indicate how many PDCP PDUs are included in the payload of the packet. Further, a PDCP PDU length indication field (LI) is added to the header of the X2-U packet to indicate the length of the PDCP PDU. The PDCP PDU length indicates that the number of the domain LI is variable and may be equal to the PDCP PDU. The number can also be one less than the number of PDCP PDUs. The latter is better in terms of cost savings. In this embodiment, the length of the last PDCP PDU is not specified to be specifically described. In this case, the PDCP PDU length indication field LI is an extension part, that is, when the payload has only one PDCP PDU, there is no LI. For example, as shown in Table 2 below, the Number of PDCP PDU is a PDCP PDU number indication field, which occupies 1 byte. In this example, the number of PDCP PDUs is K+1, and LI ₁ indicates the length of the first PDCP PDU. 2 bytes, LI ₂ indicates the length of the second PDCP PDU, which is 2 bytes, and so on. LI _k indicates the length of the Kth PDCP PDU, which is 2 bytes. Because of this mode, the PDCP PDU number indication field is inevitable, and is referred to herein as a fixed part. The PDCP PDU length indication field is likely to exist and may not exist, referred to herein as an extension.

Table 2 downlink user data X2 interface user plane protocol frame format

For example, as shown in Table 3, the format of the number of PDCP PDUs is 00000001, and there is no extension part, X2- The payload of the U packet is a PDCP PDU.

Table 3 Frame format when the payload is a PDCP PDU

The following is an example in which the MeNB forwards two PDCP PDUs to the SeNB through the X2 interface. The format of the downlink user data X2 interface user plane protocol frame is as shown in Table 4 below. The value of the Number of PDCP PDU is 00000010, which means that the payload of the X2-U packet is two PDCP PDUs. There is an extension part at this time. The LI _{1 of the} extension part indicates the length of the first PDCP PDU in the payload. SeNB After receiving the X2-U packets can be parsed LI ₁ according to a first PDCP PDU, compared with the remaining payload of the second PDCP PDU.

Table 4: Frame format when the payload is two PDCP PDUs

It is understandable that:

1) The length of the LI is not limited to the 16 bits in this example, and the length of the PDCP PDU number indicating field is not limited to the 8 bits in this example. The head byte alignment can be guaranteed by zero padding.

2) The PDCP PDU number indication field can be anywhere in the header.

3) The PDCP PDU number indication field is not limited to the binary number in this example, and may be other methods. For example, it can also be represented by a bit. For example, if there is one PDCP PDU, the number indication field is 10000000, the two PDCP PDUs are 11000000, and the ten PDCP PDUs are 11111111 11000000.

This method adds a fixed PDCP PDU number indication field Number of PDCP PDU and a dynamic increase length indication field LI based on the format defined by TS 36.425. In this way, the composition of the PDCP PDU in the payload of the X2-U packet can be effectively indicated, thereby instructing the SeNB to efficiently parse the X2-U packet to obtain each PDCP PDU.

The third way to modify:

Add one extension bit E to the head of the X2-U packet to indicate whether the number of PDCP PDUs is one. If one, the header of the packet does not include an extension for indicating how to transmit more than one PDCP PDU. section. Since the extension bit E is inevitably present in this modification, it is referred to herein as a fixed portion. Specifically, as an example, as shown in Table 5 below, the value of E is 0, indicating that there is no extension part, that is, the payload is a PDCP PDU; the value of E is 1, indicating that there is an extension part, that is, a payload. More than one PDCP PDU. It can be understood that the value of E is not limited to 0 or 1, as long as the meaning expressed by it can be distinguished.

The value of E in the fixed part of Table 5 and its corresponding description

取值 Value		描述description
取值 Value		描述description	00	不存在扩展部分，即净负荷为一个PDCP PDUThere is no extension part, ie the payload is one PDCP PDU
11	存在扩展部分，即净负荷为多个PDCP PDUThere is an extension part, that is, the payload is multiple PDCP PDUs		00

The extended portion for indicating how to transmit more than one PDCP PDU may include a PDCP PDU Length Indicator Field LI (English: length indicator) and an extended portion E. The PDCP PDU length indication field LI may be similar to the PDCP PDU length indication field in the modified second manner. The first PDCP PDU length indication field LI is used to indicate the first PDCP PDU included in the payload. The length of the second PDCP PDU length indication field LI is used to indicate the length of the second PDCP PDU included in the payload, and so on. In a specific implementation, the number of the PDCP PDU length indication field LI is variable, and may be equal to the number of PDCP PDUs or one less than the number of PDCP PDUs. The latter is better in terms of cost savings. In this embodiment, the length of the last PDCP PDU is not specified to be specifically described. In this case, the PDCP PDU length indication field LI is an extension part, that is, when the payload has only one PDCP PDU, there is no LI extension part, and When the payload has more than one PDCP PDU, the PDCP PDU length of the extended portion indicates that the number of Es of the domain LI and the extended portion is the same. E is used to indicate whether there is still a next E, that is, whether there is still a next PDCP PDU. In order to make the X2-U packet more convenient for the receiving end, E and LI can appear in pairs, that is, the first The LI in the group E and the LI indicates the length of the first PDCP PDU, and the E indicates whether there is still a second PDCP PDU. When the E in the first group E and the LI indicates that there is still a second PDCP PDU, the first group E and LI are also followed by a second set of E and LI, the LI of the second set E and LI indicates the length of the second PDCP PDU, E indicates whether a third PDCP PDU still exists, and so on. Specifically, the value of E of the extended part and the corresponding description may be as shown in Table 6 below. The value of E is 0, indicating that the next set of LI and E are not followed; the value of E is 1, indicating that the next set of LI and E are still followed. Optionally, in another embodiment, the last E may also be replaced by another PDCP PDU indication field, such as a PDCP PDU termination indication field.

The value of E in the extended part of Table 6 and corresponding description

取值 Value		描述description
取值 Value		描述description	00	其后没有E和LIThere is no E and LI afterwards
11	其后仍有E和LIThere are still E and LI		00	其后没有E和LIThere is no E and LI afterwards

For example, when the MeNB forwards a PDCP PDU to the SeNB through the X2 interface, the downlink user data X2 interface user plane protocol frame format is as shown in Table 7 below. The fixed part has a value of 0, and there is no extension. The payload of the X2-U packet is a PDCP PDU.

Table 7 Frame format when the payload is a PDCP PDU

When the MeNB forwards two PDCP PDUs to the SeNB through the X2 interface, the downlink user data X2 interface user plane protocol frame format is as shown in Table 8 below. The fixed part has an E value of 1, indicating that there is an extension part, and the payload of the X2-U packet is a plurality of PDCP PDUs. The first E of the extended part takes a value of 0, indicating that there is no E and LI behind the LI followed by it; the extended part of LI1 represents the length of the first PDCP PDU in the payload. After receiving the X2-U packet, the SeNB can parse the first PDCP PDU according to LI1, and the remaining payload is the second PDCP PDU.

Since the LI takes 11 bits in this embodiment, and the frame format is byte-aligned, the byte alignment can be achieved by zero-padding. For example, the alignment can be complemented by LI ₁ , that is, in Table 8. Padding.

Table 8 Frame format when the payload is two PDCP PDUs

When the MeNB forwards three PDCP PDUs to the SeNB through the X2 interface, the downlink user data X2 interface user plane protocol frame format is as shown in Table 9. The fixed part has an E value of 1, indicating that there is an extension part, and the payload of the X2-U packet is a plurality of PDCP PDUs. The first E of the extended part takes a value of 1, indicating that E and LI exist after the LI followed; the LI1 of the extended part indicates the length of the first PDCP PDU in the payload. The second E of the extended part takes a value of 0, indicating that there is no E and LI behind the LI followed by it; the LI2 of the extended part indicates the length of the second PDCP PDU in the payload. After receiving the X2-U packet, the SeNB can successfully parse the first and second PDCP PDUs according to the indications of LI1 and LI2, and the remaining payload is the third PDCP PDU.

Table 9 Frame format when the payload is three PDCP PDUs

Since LI takes 11 bits in this embodiment, and the frame formats are all byte-aligned, when the transmitted PDCP PDUs are even, the E and LI of the extended parts are odd, and the last set of E and LI The latter is preferably padded with zeros to satisfy the rule that the frames are byte aligned. When the number of PDCP PDUs transmitted is an odd number, the E and LI of the extended part are even, and each set of E and LI takes up exactly 3 bytes, which can achieve byte alignment without filling in zero. The frame format of the specific odd array E and LI can be as shown in Table 10 below. As shown, the frame format of the even arrays E and LI can be as shown in Table 11 below.

Table 10 Downstream User Data X2 Interface User Plane Protocol Frame Format (odd number of LIs)

Table 11 Downstream User Data X2 Interface User Plane Protocol Frame Format (even number of LIs)

The above is the case where the number of PDCP PDU length indication fields LI is equal to the number of PDCP PDUs minus 1, that is, the length of the last PDCP PDU is not indicated. When the number of PDCP PDU length indication fields LI is equal to the number of PDCP PDUs, the length of the last PDCP PDU is indicated, and the PDCP PDU length indication field LI is also a fixed part, that is, when the payload has only one PDCP PDU, the fixed part There are both E and LI. When there is more than one PDCP PDU in the payload, the PDCP PDU length of the extended part indicates that the number of Es in the domain LI and the extended part is still the same. Each set of E and LI indicates information of one PDCP PDU in the payload.

Specifically, the number of PDCP PDU length indication fields LI is equal to the number of PDCP PDUs minus one. When the MeNB group has an X2-U packet, the following steps can be completed: 1) writing the fixed part of the E (0 or 1) according to the number of PDCP PDUs to be forwarded; 2) the number of PDCP PDUs to be forwarded according to the need And length determine how to write the extensions (E and LI).

After the SeNB receives the X2-U packet: 1) reads the E of the fixed part to determine whether there is an extension part; 2) if there is an extension part, parses all PDCP PDUs according to each E and LI of the extension part.

Understandably,

1) The length of the LI is not limited to 11 bits. The length of the LI can be specified according to actual needs. The specific frame format is similar to the above embodiment, and can also be complemented by zero-filling to achieve byte alignment.

2) The position of the E+LI combination is not limited to the description of this example, for example, it may be before the X2-U Sequence Number.

3) Each group E and LI can be E before LI or E after LI.

This modification method adds a fixed extension flag E based on the X2 interface user plane protocol frame format defined in TS 36.425, and dynamically increases the extension portion in the header. With this modification, the composition of the PDCP PDU in the payload of the X2-U packet can be effectively identified, thereby instructing the SeNB to efficiently parse the X2-U packet to obtain each PDCP PDU.

Any of the modifications described in the above embodiments are for downlink data transmission. In the dual connectivity scenario, the transmission of uplink data is also included. Embodiment 2 of the present invention is directed to transmission of uplink data in a dual connectivity scenario. The UE simultaneously obtains radio resources from the MeNB and the SeNB, and distributes the data to the MeNB and the SeNB for simultaneous uploading. As shown in FIG. 7 , after the SeNB parses the data reported by the UE into an RLC SDU, the SeNB carries one or more RLC SDUs in the X2-U packet payload to the MeNB through the X2-U packet, and the RLC SDU at this time is PDCP PDU. The MeNB aggregates the data reported by the UE and the data forwarded by the SeNB at the PDCP layer, and performs the sorting. After the completion, the MeNB reports the upper layer network element in sequence. It can be understood that any of the above modifications described for the downlink data transmission can also be applied to the modification of the frame format for the uplink data transmission. The difference from the above embodiment is that a field related to the scene of the uplink data transmission can be defined in the frame format. For example, the existing PDU Type is defined by two values, one is the aforementioned DL USER DATA for downlink data transmission, and the other is STATUS REPORT. For different application scenarios, a new PDU Type can be defined: UL USER DATA, Corresponds to the uplink data transmission.

It can be understood that, in the dual connectivity scenario described in the first embodiment and the second embodiment, both the MeNB and the SeNB comply with the LTE protocol, and belong to the cellular communication network, and any modification described in the above embodiments may also be applied. Communication between wireless access devices that comply with different protocols. In the third embodiment of the present invention, a scenario in which a wireless access device in LTE and a WLAN implements dual connectivity is taken as an example. As shown in FIG. 8 , a wireless access device in a cellular communication network is an eNB, and a wireless access device in a WLAN. For the AP. The splitting of the PDCP layer for the downlink transmission and the convergence of the PDCP layer for the uplink transmission are similar to the schemes of the first embodiment and the second embodiment. The difference is that the interface between the eNB and the AP is not an X2 interface but an Xw interface. The Xw interface is a logical interface defined between the eNB and the AP, and may be a wired interface or a wireless interface. The receiving end of the Xw interface in the AP parses one or more PDCP PDUs carried in the received Xw-U packet, and then sends each PDCP PDU as a whole to process the existing AP process. UE. After receiving the data, the UE obtains each PDCP PDU according to the existing procedure, and then aggregates the PDCP PDUs received by the UE from the eNB, and then sorts the packets to the application layer of the UE. The definition of the frame format for the Xw interface is the same as that of any of the above-mentioned embodiments, and is not described here.

In the handover scenario, there is also a case where the two base stations transmit data through the X2 interface. For example, the source eNB forwards the PDCP SDU that has not been sent to the target eNB through the X2 interface by using the GTP-U protocol. Finish sending. An existing implementation is to forward only one PDCP SDU to the target eNB by the source eNB each time, resulting in inefficiency. In order to implement that the source eNB forwards more than one PDCP SDU to the target eNB, any manner described in the above embodiments and the manner in which the frame format is modified related to the data packet transmission may also be applied. Embodiment 4 of the present invention is described by taking an example in which a source eNB sends a data packet to a target eNB in a handover scenario. The embodiment of the present invention may use the technical solutions of the foregoing first, second, and third embodiments. The source eNB sends the X2-U packet carrying one or more PDCP SDU packets to the target eNB in the modified frame format, and the modified frame is used. The format may indicate that the target eNB parses the X2-U packet according to the frame format to obtain each PDCP SDU packet carried in the X2-U packet. The difference from the above embodiment is that the fields related to this application scenario can be defined and switched in the frame format. For example, to distinguish the application scenario, the PDU Type associated with defining and switching the application scenario is 3, that is, the PDU Type in the frame format can be filled into 3, The body representation can be in binary 0011, or it can be used in other ways.

Specifically, the source eNB encapsulates one or more PDCP SDUs to be forwarded into one X2-U packet, and fills in the corresponding X2 interface user plane protocol frame format according to any of the above modifications. After receiving the X2-U packet, the target eNB parses the corresponding domain in the X2 interface user plane protocol frame, and parses the X2-U packet to obtain each PDCP SDU.

With this solution, after receiving the X2-U packet that is sent by the source eNB and carrying multiple PDCP SDU packets, the target eNB can successfully parse and improve the transmission efficiency.

In summary of the above embodiments, a fifth embodiment of the present invention provides a data transmission method, a wireless access device, and a communication system. In the embodiment of the present invention, a wireless access device refers to a device in a wireless communication network that connects a user equipment to a wired network (such as a core network) in a wireless manner. The senders are collectively referred to as a first wireless access device, and the recipients are collectively referred to as a second wireless access device. It can be understood that the first radio access device can be, but is not limited to, an MeNB, a SeNB, an AP, or a source eNB, and the second radio access device can be, but is not limited to, a SeNB, an MeNB, an AP, or a target eNB. The transmitted data packets are collectively referred to as protocol data packets or interface data packets, and may be, but not limited to, GTP-U packets or X2-U packets. The data packets carried by the data payload of the data packets are collectively referred to as payload data packets, but may Limited to PDCP PDU, PDCP SDU or RLC SDU. The specifics of the first wireless access device, the second wireless access device, the protocol data packet, and the payload data packet can be determined according to the scenario applied by the method, the wireless access device, and the communication system. In addition, the embodiments of the present invention are not limited to the LTE communication system, and may be applied to other communication systems, such as UMTS, and may also be applied to other dual-connection offloading situations, such as splitting at the RLC layer, the MAC layer, or the IP layer, correspondingly. The forwarded data packet is an RLC PDU, a MAC PDU, or an IP data packet, and the protocol involved is not limited to the GTP-U protocol, such as an IP tunneling protocol, and a wireless access point control protocol (English: Control and Provisioning of Wireless) Access Points, referred to as CAPWAP protocol or 802.3 protocol, are not limited to X2 or Xw interfaces.

Illustratively, FIG. 9 shows a flow chart of a data transmission method. The data transmission method shown in FIG. 9 adopts any one of the above modified frame formats, and the flow is mainly explained. As shown in Figure 9:

S101. The first wireless access device sends an interface data packet to the second wireless access device by using an interface with the second wireless access device, where the payload of the interface data packet includes N payload data packets, where N is An integer greater than or equal to one, the header of the interface data packet includes at least information indicating the number of the payload data packets (which may be simply referred to as quantity information).

S102. The second radio access device receives the interface data packet by using an interface with the first radio access device, and the information that is used by the interface data packet header to indicate the quantity of the payload data packet. The interface packet is parsed to obtain each payload packet.

Further, the header of the interface data packet further includes information (may be simply referred to as length information) for indicating the length of each payload data packet of at least N-1 payload data packets among the N pieces. In step 102, the second radio access device may further parse the interface data packet according to the quantity information and the length information.

It can be understood that, in the case that the size (also referred to as the length) of each payload packet is consistent, the second wireless access device can be reached only by the information indicating the number of payload packets in the interface data packet. Successfully parsing the interface packet to obtain the purpose of each payload packet.

Optionally, the information used to indicate the quantity of the payload data packet may be an actual number of payload data packets, such as using m bits (m is an integer greater than or equal to 1) to form a domain to represent a payload data packet. The actual number N or the actual number minus 1 (N-1) may also be information corresponding to the actual number of payload data packets, such as a field for representing one payload data packet by using t bits, sharing N The fields represent N payload packets or N-1 domains represent N-1 payload packets. Other means may also be used to achieve the purpose of indicating the number of the payload data packets, for example, one field indicates the actual number in the partial payload data packet and the plurality of domains respectively represent each payload data in the partial payload data packet. The manner in which the packages are combined may not be limited herein.

Optionally, the information (which may be simply referred to as length information) for indicating the length of each payload data packet of at least N-1 payload data packets of the N may include at least N-1 indicating 1 payload. The information of the length of the data packet, each of which indicates the information of one payload data packet, may be information corresponding to the actual length of one payload data packet or one-to-one correspondence with the actual length of one payload data packet. In the latter case, the second wireless access device can parse according to the information corresponding to the actual length and its correspondence with the actual length. Wherein, the information indicating the length of one payload data packet can utilize n bits. (n is an integer greater than or equal to 1) constitutes a domain representation, and a total of N-1 fields are used to represent the actual length of the N-1 payload packets, such that the remaining portion of the payload is the Nth payload packet. Or, a total of N fields are used to represent the actual length of the N payload data packets. The information for indicating the length of one payload packet can be arranged in the order in which the payload packets are sent in the payload.

When the foregoing quantity information is represented by using a m-bit bit (m is an integer greater than or equal to 1) to form a domain (which may also be referred to as a field), the quantity information may be placed before the foregoing length information in the frame format, so that the second wireless The access device first receives the quantity information and then receives the length information. When the foregoing quantity information uses t bits to form a field for representing one payload data packet, the common N fields represent N payload data packets or N-1 domains represent N-1 payload data packets to represent In the frame format, the field indicating the one payload data packet may be followed by information indicating the length of the payload data packet, such that the domain indicating the one payload data packet and the length indicating the payload data packet are The information appears in groups, and further, may appear in the order in which the payload data packets are sent in the payload, so that the second wireless access device can perform the parsing of the interface data packets according to the quantity information and the length information.

Specifically, the quantity information may be the PDCP PDU number indication domain Number of PDCP PDU in the foregoing embodiment, or may be a fixed part extension bit E, a fixed part extension bit E and an extension part extension bit E. The length information may be the PDCP PDU length indication field LI in the foregoing embodiment. The location information and the value of the quantity information in the frame may also be referred to the description in the foregoing embodiment, and details are not described herein again.

Optionally, the first wireless access device may be the MeNB, the second wireless access device may be the SeNB, the interface data packet may be an X2-U packet, the payload data packet may be a PDCP PDU, or the first wireless access The device may be a SeNB, the second wireless access device may be an MeNB, the interface data packet may be an X2-U packet, and the payload data packet may be an RLC SDU (ie, a PDCP PDU), or the first wireless access device may be The eNB, the second radio access device may be an AP, and the interface between the eNB and the AP is an Xw interface, and the interface data packet transmitted through the interface may be referred to as an Xw-U (Xw user plane) packet, and the payload data packet may be For the PDCP PDU, the first wireless access device may be the source eNB, the second wireless access device may be the target eNB, the interface data packet may be an X2-U packet, the payload data packet may be a PDCP SDU, or may have Other scenarios are not described here.

According to the data transmission method provided by the embodiment of the present invention, the first wireless access device and the second The wireless access device transmits multiple payload data packets in one interface data packet to improve transmission efficiency.

In order to implement the data transmission method provided by the embodiment of the present invention, the existing first wireless access device and the second wireless access device need to be modified, so that the first wireless access device can be modified according to any of the foregoing modified frames. The format performs the filling and encapsulation of the interface data packet to carry one or more payload data packets and corresponding indication information, and the second wireless access device may perform the received interface data packet according to the indication information in the corresponding frame format. Parse and obtain the corresponding individual payload data packets. It can be understood that as a wireless access device entity, it can serve as either the first wireless access device (sender) or the second wireless access device (receiver). Thus, on the same wireless access device entity, it can include both encapsulation and parsing modifications.

According to the method provided by the embodiment of the present invention, as shown in FIG. 10, the wireless access device provided in the embodiment of the present invention may include a transceiver unit 1001 and a processing unit 1002. The processing unit 1002 is configured to encapsulate a first interface data packet, where the payload of the first interface data packet includes N first payload data packets, where N is an integer greater than or equal to one, and the first interface data packet is The header includes at least information indicating the number of the first payload data packets (which may be simply referred to as first quantity information); the transceiver unit 1001 is configured to send the first interface data packet to another wireless access device. Further, the header of the first interface data packet may further include information for indicating a length of each first payload data packet of at least N-1 first payload data packets of the N (may be referred to as a a length of information).

The transceiver unit 1001 is further configured to receive a second interface data packet from another wireless access device, where the payload of the second interface data packet includes S second payload data packets, where S is an integer greater than or equal to one. The header of the second interface data packet includes at least information indicating the number of the second payload data packets (which may be simply referred to as second quantity information); the processing unit 1002 may also be configured to follow the second interface. The second interface data packet is parsed by the information carried in the packet header for indicating the quantity of the second payload data packet to obtain each second payload data packet. Further, the header of the second interface data packet may further include information for indicating a length of each second payload data packet of at least S-1 second payload data packets in the S (may be referred to as a Two length information). The processing unit 1002 is further configured to parse the second interface data packet according to the second quantity information and the second length information carried by the second interface data packet header, to obtain each second payload data packet.

As an implementation manner, the function of the transceiver unit 1001 can be implemented by a dedicated chip through a transceiver circuit or a transceiver. Processing unit 1002 may be implemented by a dedicated processing chip, processing circuit, processor, or general purpose chip.

As another implementation manner, a wireless access device provided by an embodiment of the present invention may be implemented by using a general-purpose computer. The program code that will implement the functions of the transceiver unit 1001 and the processing unit 1002 is stored in a memory, and the processor implements the functions of the transceiver unit 1001 and the processing unit 1002 by executing code in the memory.

For the concepts, explanations, and detailed description of the technical solutions provided by the embodiment of the present invention, the description of the content in the foregoing method or other embodiments is not described herein.

The wireless access device provided by the embodiment of the present invention can implement multiple transmission payload data packets in one interface data packet with another wireless access device, thereby improving transmission efficiency.

According to the method provided by the embodiment of the present invention, the embodiment of the present invention further provides a communication system, including the foregoing first wireless access device and second wireless access device.

The first wireless access device is configured to send an interface data packet to the second wireless access device, where the payload of the interface data packet includes N payload data packets, where N is an integer greater than or equal to one, the first The header of the interface data packet includes at least information indicating the number of the payload data packets (which may be simply referred to as quantity information);

The second wireless access device is configured to receive the interface data packet, and parse the interface data packet according to the information carried in the interface data packet header for indicating the quantity of the payload data packet, to obtain each payload data pack.

Further, the header of the interface data packet further includes information (may be simply referred to as length information) for indicating the length of each payload data packet of at least N-1 payload data packets among the N pieces. The second wireless access device can also be configured to parse the interface data packet according to the quantity information and the length information.

The communication system provided by the embodiment of the present invention can implement multiple transmission payload data packets in one interface data packet between two wireless access devices, thereby improving transmission efficiency.

It can be understood that the numbers appearing in the embodiment are as in the first, second, third, fourth or fifth embodiment.

Modes

1, 2 or 3 are for convenience of description and do not represent advantages and disadvantages between the programs.

Those skilled in the art will appreciate that information and signals can be represented using any technical techniques, such as: data, instructions, commands, information, signals, bits. (bit), symbols, and chips may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, or light fields or optical particles, or any combination of the above.

It is also understood by those skilled in the art that the various illustrative logical blocks and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented by hardware or software depends on the design requirements of the particular application and the overall system. A person skilled in the art can implement the described functions using various methods for each specific application, but such implementation should not be construed as being beyond the scope of the embodiments of the present invention.

The various illustrative logic blocks, units and circuits described in the embodiments of the invention may be implemented by general purpose processors, digital signal processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic. Devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the functions described. A general purpose processor may be a microprocessor. Alternatively, the general purpose processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration. achieve.

The steps of the method or algorithm described in the embodiments of the present invention may be directly embedded in hardware, a software unit executed by a processor, or a combination of the two. The software unit can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art. Illustratively, the storage medium can be coupled to the processor such that the processor can read information from the storage medium and can write information to the storage medium. Alternatively, the storage medium can also be integrated into the processor. The processor and the storage medium may be disposed in an ASIC, and the ASIC may be disposed in the base station. Alternatively, the processor and the storage medium can also be configured Placed in different components in the base station.

In one or more exemplary designs, the above-described functions described in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, these functions may be stored on a computer readable medium or transmitted as one or more instructions or code to a computer readable medium. Computer readable media includes computer storage media and communication media that facilitates the transfer of computer programs from one place to another. The storage medium can be any available media that any general purpose or special computer can access. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other device or data structure that can be used for carrying or storing Other media that can be read by a general purpose or special computer, or a general purpose or special processor. In addition, any connection can be appropriately defined as a computer readable medium, for example, if the software is from a website site, server or other remote source through a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) Or wirelessly transmitted in, for example, infrared, wireless, and microwave, is also included in the defined computer readable medium. The disks and discs include compact disks, laser disks, optical disks, DVDs, floppy disks, and Blu-ray disks. Disks typically replicate data magnetically, while disks typically optically replicate data with a laser. Combinations of the above may also be included in a computer readable medium.

The above description of the specification of the present invention may enable any of the art to utilize or implement the present invention. Any modifications based on the disclosure should be considered as obvious in the art. The basic principles described herein can be applied to other variants. Without departing from the spirit and scope of the invention. Therefore, the present disclosure is not limited to the described embodiments and designs, but may be extended to the maximum extent consistent with the principles of the invention and the novel features disclosed.

Claims

A wireless access device, configured to access a user equipment to a wired network by using a wireless access device, where the wireless access device includes a transceiver unit (1001) and a processing unit (1002),

The processing unit is configured to encapsulate a first interface data packet, where the payload of the first interface data packet includes N first payload data packets, where N is an integer greater than or equal to one, and the header of the first interface data packet The portion at least includes information indicating the number of the first payload data packets;

The transceiver unit is configured to send the first interface data packet to the another wireless access device by using an interface with another wireless access device.
The wireless access device according to claim 1, wherein the header of the first interface data packet further comprises: each of at least N-1 first payload data packets for indicating N The length of the information.
The wireless access device according to claim 1 or 2, wherein the information indicating the number of the first payload data packets is a domain filled with the first payload data packet. Total number N; or,

The information indicating the number of the first payload data packets is N domains, and each domain indicates that there is a corresponding first payload data packet, and different domains correspond to different first payload data packets.
The radio access device according to any one of claims 1 to 3, wherein the information indicating the length of each of at least N-1 first payload data packets of the N is N-1 domains, each domain represents the length of a corresponding first payload data packet, and different domains correspond to different first payload data packets, or

The information for indicating the length of each of at least N-1 first payload data packets of the N is N domains, and each domain represents a length of a corresponding first payload data packet, different The domain corresponds to a different first payload packet.
The wireless access device according to any one of claims 1 to 4, wherein the first payload data packet includes information transmitted to the user equipment or includes information received from the user equipment.
The wireless access device according to any one of claims 1 to 5, wherein the transceiver unit is further configured to receive from the another wireless access device through an interface with another wireless access device. a second interface data packet, the payload of the second interface data packet includes S second payload data packets, S is an integer greater than or equal to one, and a header of the second interface data packet includes at least Information of the number of the second payload data packets;

The processing unit is further configured to parse the second interface data packet according to the information that is used by the second interface data packet header to indicate the quantity of the second payload data packet, to obtain S second payload data. package.
The wireless access device according to claim 6, wherein the header of the second interface data packet further comprises means for indicating each of at least S-1 second payload data packets of the S. Length information, the processing unit is further configured to: according to the second interface data packet header, information indicating the number of the second payload data packet and to indicate at least S-1 of the S The information of the length of each of the second payload data packets is analyzed for the second interface data packet to obtain S second payload data packets.
The radio access device according to any one of claims 1-7, wherein the base station is a base station in a cellular communication network or an access point in a wireless local area network (WLAN).
A communication system, comprising: a first wireless access device and a second wireless access device connected through an interface, wherein the first wireless access device and the second wireless access device are both used to wirelessly Connect the user equipment to the wired network, where

a first radio access device, configured to send, by using the interface, an interface data packet to the second radio access device, where the payload of the interface data packet includes N payload data packets, where N is an integer greater than or equal to one, The header of the first interface data packet includes at least information indicating the number of the payload data packets; and

a second wireless access device, configured to receive the interface data packet by using the interface, and parse the interface data packet according to the information carried in the interface data packet header for indicating the quantity of the payload data packet , get N payload data packets.
The communication system according to claim 9, wherein said header of said interface packet Also included is information for indicating a length of each of at least N-1 payload data packets of N, the second wireless access device being further operable to follow information for indicating the number of the payload data packets The interface data packet is parsed with information indicating the length of each of at least N-1 payload data packets of the N.
The communication system according to claim 9 or 10, wherein the information indicating the number of the payload data packets is a domain, and the total number N of the payload data packets is filled; or

The information used to indicate the number of the payload data packets is N domains, and each domain indicates that there is one corresponding payload data packet, and different domains correspond to different payload data packets.
The communication system according to any one of claims 9 to 11, wherein the information for indicating the length of each of at least N-1 payload data packets of N is N-1 Domain, each domain represents the length of a corresponding payload packet, and different domains correspond to different payload packets, or,

The information for indicating the length of each of at least N-1 payload data packets of the N is N domains, and each domain represents a length of a corresponding payload data packet, and different domains correspond to different lengths. Payload data package.
The communication system according to any one of claims 9 to 12, wherein the first wireless access device is a source base station in a handover scenario, and the second wireless access device is a target in a handover scenario. Base station; or,

The first wireless access device and the second wireless access device are wireless access devices in a dual connectivity scenario.
The communication system according to any one of claims 9 to 13, wherein the first wireless access device and the second wireless access device are base stations in a cellular communication network, or the first The wireless access device is a base station in a cellular communication network, the second wireless access device is an access point in a WLAN, or the first wireless access device is an access point in a WLAN, and the second A wireless access device is a base station in a cellular communication network.
A method for data transmission, comprising:

Receiving, by the interface between the second wireless access device and the second wireless access device, the first wireless device An interface packet of the line access device, the payload of the interface data packet includes N payload data packets, N is an integer greater than or equal to one, and a header of the interface data packet includes at least indicating the payload Information on the number of packets;

The second radio access device parses the interface data packet according to the information carried in the interface packet header for indicating the quantity of the payload data packet, and obtains N payload data packets.
The method according to claim 15, wherein the header of the interface data packet further comprises information for indicating a length of each of at least N-1 payload data packets of the N, the second wireless The access device may be further configured to use the interface data packet according to information indicating a quantity of the payload data packet and information indicating a length of each of at least N-1 payload data packets of the N Analyze.
The method according to claim 15 or 16, wherein the information indicating the number of the payload data packets is a domain, and the total number N of the payload data packets is filled; or

The information used to indicate the number of the payload data packets is N domains, and each domain indicates that there is one corresponding payload data packet, and different domains correspond to different payload data packets.
The method according to any one of claims 15-17, wherein the information indicating the length of each of at least N-1 payload data packets of N is N-1 domains Each field represents the length of a corresponding payload packet, and different domains correspond to different payload packets, or,

The information for indicating the length of each of at least N-1 payload data packets of the N is N domains, and each domain represents a length of a corresponding payload data packet, and different domains correspond to different lengths. Payload data package.
The method according to any one of claims 15 to 18, wherein the first radio access device is a source base station in a handover scenario, and the second radio access device is a target base station in a handover scenario. ;or,

The first wireless access device and the second wireless access device are wireless access devices in a dual connectivity scenario.
The method according to any one of claims 15 to 19, wherein the first wireless access device and the second wireless access device are base stations in a cellular communication network, or the first The wireless access device is a base station in a cellular communication network, the second wireless access device is an access point in a WLAN, or the first wireless access device is an access point in a WLAN, and the second A wireless access device is a base station in a cellular communication network.