WO2013155709A1

WO2013155709A1 - Data streaming configuration method, base station system, and user equipment

Info

Publication number: WO2013155709A1
Application number: PCT/CN2012/074459
Authority: WO
Inventors: 黄曲芳; 曾清海
Original assignee: 华为技术有限公司
Priority date: 2012-04-20
Filing date: 2012-04-20
Publication date: 2013-10-24
Also published as: WO2013155846A1

Abstract

Embodiments of the present invention relate to the field of communications, capable of implementing dynamic streaming. Disclosed are a data streaming configuration method, a base station system, and a user equipment (UE). The data streaming configuration method of the embodiments of the present invention comprises: a main base station transmitting a first message to an auxiliary base station, thus allowing the auxiliary base station to determine an RB-to-be-streamed and to set a configuration parameter for the RB-to-be-streamed; receiving a second message from the auxiliary base station, where the second message comprises the configuration parameter of the RB-to-be-streamed; transmitting a third message to the UE, thus allowing the UE to establish for the RB-to-be-streamed a second Packet Data Convergence Protocol (PDCP) entity and a second radio link control layer protocol (RLC) entity and to perform data streaming configuration.

Description

Data offload configuration method, base station system and user terminal

The present invention relates to the field of communications, and in particular, to a data offload configuration method, a base station system, and a user terminal.

Background technique

With the development of mobile communication systems, communication systems are able to provide higher transmission rates and quality of service, and users have placed higher demands on transmission rates. In order to ensure the rate of most users without significantly increasing the configuration bandwidth and provide higher throughput for some users, the 3rd Generation Partnership Project (3GPP) introduced carrier aggregation (Carrier). Aggregation, referred to as CA) technology. Carrier aggregation means that User Equipment (UE) can use multiple Component Carriers (CCs) for uplink and downlink communication to support high-speed data transmission. When the user rate is reduced, some component carriers can be released, and only one resident carrier is reserved, and the released transmission resources can be used by other users, thereby achieving flexible and dynamic purposes.

According to the location of the base station where the aggregated carrier is located, the carrier aggregation of the Long Term Evolution (LTE) system can be roughly divided into intra-base station cell aggregation, inter-base station cell aggregation, and the like. In the scenario of cell aggregation between base stations, data can be transmitted via multiple cells. According to the data offloading mechanism, data offloading can be divided into two categories: one is based on radio bearer (RB) data splitting, and the other is packet based data shunting. RB-based data offloading refers to traffic splitting. When the UE has multiple services at the same time, data of some services is transmitted through one base station, and data of other services is transmitted through another base station. Well, the base station through which the data is transmitted, the only basis is that the RB to which the data packet belongs cannot be dynamically adjusted according to the air interface condition, so the dynamics are not very good. Packet-based data offloading scheme is based on real-time air interface conditions. Which base station the fixed data is transmitted through, so that the two communicating parties can select a suitable base station for transmission according to the quality of the air interface and the degree of congestion.

In the packet-based data offloading of the prior art, which base station is transmitted by each downlink packet, which is determined by a service gateway (SGW), and which base station is transmitted by the uplink data packet, by two base stations. After negotiation, the UE is notified by a scheduling command. The uplink data is transmitted by different base stations and eventually aggregated to the SGW. Since the data offload is determined by the SGW, if the air interface condition changes and the data offload policy is changed, the configuration of the protocol stack of the SGW needs to be changed. Therefore, the behavior of the network side is changed, and the dynamics of the data offload is poor, which seriously affects the user. usage of.

Summary of the invention

A technical problem to be solved by the embodiments of the present invention is to provide a data offload configuration method, a base station system, and a user terminal, to implement dynamic offloading.

To solve the above technical problem, the embodiment of the present invention adopts the following technical solutions: A data offload configuration method includes:

The primary base station sends a first message to the secondary base station, where the first message is used to request data splitting from the secondary base station, where the first message includes an identifier of the radio bearer RB and a Qos parameter of the service quality requirement of the RB. So that the secondary base station determines the to-be-split RB and sets configuration parameters for the to-be-split RB;

The primary base station receives a second message from the secondary base station, where the second message includes configuration parameters of the to-be-split RB;

The primary base station sends a third message to the user terminal UE, where the third message includes the identifier of the to-be-offered RB and the configuration parameter of the to-be-offered RB, so that the UE establishes the Two PDCP entities and a second RLC entity are configured for data offloading;

The UE has a first PDCP entity, a first RLC entity, and a MAC real The second PDCP entity and the second RLC entity are located between the first RLC entity and the MAC entity.

A downlink data transmission method includes:

The PDCP entity of the primary base station receives the data from the serving gateway SGW, and processes the data to form the first data. The data offload type of the method is a partial offload, and the partial offload refers to the data part of an RB. Transmitted via the secondary base station, partially transmitted via the primary base station;

The RLC entity of the primary base station adds a first RLC sequence number to the first data, forms second data, and sends the data to be offloaded in the second data to the PDCP entity of the secondary base station; the PDCP entity of the secondary base station Transmitting the to-be-split data to an RLC entity of the secondary base station;

The secondary base station processes the to-be-divided data, and sends the processed to-be-split data to the UE.

A downlink data transmission method includes:

The PDCP entity of the primary base station receives the data from the serving gateway SGW, and processes the data to form the first data. The data offload type of the method is complete offloading, and the complete offload refers to all data of one RB. Transmitting via a secondary base station;

The RLC entity of the primary base station receives the first data, and sends the first data to a PDCP entity of the secondary base station;

The PDCP entity of the secondary base station receives the first data from the primary base station, and sends the first data to an RLC entity of the secondary base station;

The secondary base station processes the first data, and sends the processed first data to the UE.

An uplink data transmission method includes:

The UE reports the BSR to the primary base station and/or the secondary base station, so that the primary base station and/or the secondary base station allocates uplink transmission resources to the UE; The first PDCP entity of the UE processes the received data to form the first data; the first RLC entity of the UE segments the first data into segments, adds the first RLC sequence number, and forms the second data. And sending, to the second PDCP entity, the data to be offloaded in the second data according to the received uplink transmission resource allocated by the secondary base station;

Transmitting, by the second PDCP entity of the UE, the offloaded data to a second RLC entity of the UE;

The second RLC entity of the UE adds the second RLC sequence number to the received data to be offloaded to form third data, and sends the third data to the MAC entity of the UE; the physical layer of the UE will process The subsequent third data is sent to the secondary base station.

An uplink data transmission method includes:

The UE reports the BSR to the primary base station and/or the secondary base station, so that the primary base station and/or the secondary base station allocates uplink transmission resources for the U E;

The first PDCP entity of the UE processes the received data to form first data; the first RLC entity of the UE adds a first RLC sequence number to the first data, forms a second data, and the foregoing The second PDCP entity to be offloaded to the UE in the second data;

Sending, by the second PDCP entity of the UE, the to-be-split data to a second RLC entity of the UE;

And the second RLC entity of the UE adds the second RLC sequence number to form the third data according to the received uplink transmission resource allocated by the secondary base station, and then adds the second RLC sequence to form the third data. Three data are sent to the MAC entity of the UE;

The physical layer of the UE sends the processed third data to the secondary base station. A base station comprising:

Transmitter for:

Sending a first message to the secondary base station, where the first message is used to request data splitting from the secondary base station, where the first message includes an identifier of the radio bearer RB and the RB The service quality requires a Qos parameter, so that the secondary base station determines the to-be-offered RB and sets configuration parameters for the to-be-split RB;

Sending a third message to the user terminal UE, where the third message includes the identifier of the to-be-offered RB and the configuration parameter of the to-be-offered RB, so that the UE establishes a second PDCP entity for the to-be-split RB and a second RLC entity and performing data offload configuration;

a receiver, configured to receive a second message from the secondary base station, where the second message includes configuration parameters of the to-be-split RB;

The UE has a first PDCP entity, a first RLC entity, and a MAC entity, and the second PDCP entity and the second RLC entity are located between the first RLC entity and the MAC entity.

A base station system includes a primary base station and a secondary base station, where the primary base station includes a PDCP entity and an RLC entity, and the secondary base station includes a PDCP entity and an RLC entity.

The PDCP entity of the primary base station is configured to receive data from the serving gateway SGW, and process the data to form first data, where the data transmission method is partially offloaded;

The RLC entity of the primary base station is configured to add a first RLC sequence number to the first data, form second data, and send the data to be offloaded in the second data to a PDCP entity of the secondary base station;

The PDCP entity of the secondary base station is configured to send the to-be-split data to an RLC entity of the secondary base station;

The secondary base station is configured to process the to-be-divided data, and send the processed to-be-split data to the UE.

The PDCP entity of the primary base station is configured to receive data from the serving gateway SGW, and process the data to form first data, where the data transmission method is completed. Fully diverted;

The RLC entity of the primary base station is configured to receive the first data, and send the first data to a PDCP entity of the secondary base station;

The PDCP entity of the secondary base station is configured to receive the first data from the primary base station, and send the first data to an RLC entity of the secondary base station;

A user terminal, including a first PDCP entity, a first RLC entity, a MAC entity, and a physical layer, further comprising: a 881 upper unit, a second PDCP entity, and a second RLC entity, the second PDCP entity and the second The RLC entity is located between the first RLC entity of the UE and the MAC,

The BSR reporting unit is configured to report a BSR to the primary base station and/or the secondary base station, so that the primary base station and/or the secondary base station allocate uplink transmission resources to the UE;

The first PDCP entity is configured to process the received data to form a first data;

The first RLC entity is configured to perform segmentation concatenation of the first data, add a first RLC sequence number, form second data, and perform the foregoing according to the received uplink transmission resource allocated by the secondary base station. The data to be offloaded in the second data is sent to the second PDCP entity; the second PDCP entity is configured to send the offloaded data to the second RLC entity of the UE;

The second RLC entity is configured to add the second RLC sequence number to the received data to be offloaded, form third data, and send the third data to the MAC entity of the UE;

The physical layer of the UE is configured to send the processed third data to the secondary base station. A user terminal, including a first PDCP entity, a first RLC entity, a MAC entity, and a physical layer, further includes: a 881 upper unit, a second PDCP entity, and a second RLC entity. The second PDCP entity and the second RLC entity are located between the first RLC entity of the UE and the MAC,

The first RLC entity is configured to add a first RLC sequence number to the first data, to form a second data, and send the to-be-split data in the second data to a second PDCP entity of the UE;

The second PDCP entity is configured to send the to-be-split data to a second RLC entity of the UE;

The second RLC entity is configured to add the second RLC sequence number to form a third data according to the received uplink transmission resource allocated by the secondary base station, and then add the second RLC sequence number to form the third data. Transmitting third data to a MAC entity of the UE;

The physical layer of the UE is configured to send the processed third data to the secondary base station. The data offloading configuration method, the base station system, and the user terminal of the embodiment of the present invention change the prior art by setting a second PDCP entity and a second RLC entity between the first RLC entity of the UE and the MAC entity. The processing flow of the split data has a faster response to the changes in the air interface measured at the bottom layer, and the dynamic shunting effect is better.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in FIG. Further drawings can also be obtained from these drawings.

1 is a schematic flowchart of a data offloading configuration method according to an embodiment of the present invention; FIG. 2 is a schematic diagram of signaling interaction of a data offloading configuration method according to an embodiment of the present invention; 3 is a schematic structural diagram of a protocol stack in an embodiment of the present invention;

4 is a schematic diagram of a front-back comparison of data offload configuration in an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a downlink data transmission method according to an embodiment of the present invention;

6 is a schematic diagram of a downlink data transmission process according to an embodiment of the present invention;

7 is a second schematic diagram of a downlink data transmission process according to an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a method for transmitting a downlink data according to an embodiment of the present invention; FIG. 9 is a schematic flowchart of an uplink data transmission method according to an embodiment of the present invention; FIG. 10 is a schematic diagram of an uplink data transmission process according to an embodiment of the present invention;

1 is a schematic diagram of a UE in an uplink data transmission process according to an embodiment of the present invention; FIG. 12 is a schematic flowchart of a method for transmitting an uplink data according to an embodiment of the present invention; FIG. 13 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a base station system according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a user terminal according to an embodiment of the present invention.

detailed description

The embodiment of the invention provides a data offloading configuration method, a base station system and a user terminal, which have a quick response to the change of the air interface condition, and the dynamic shunting effect is good.

In the following description, for purposes of illustration and description, reference reference However, well-known devices, circuits, and methods are omitted in the description of the present invention in order to avoid obscuring the description of the present invention.

The various techniques described herein can be used in a variety of wireless communication systems, such as current 2G, 3G communication systems and next generation communication systems, such as Global System for Mobile Communications (GSM), Code Division Multiple Access ( Code Division Multiple Access (CDMA) system, Time Division Multiple Access (TDMA) system, Wideband Code Division Multiple Access Wireless (WCDMA), Frequency Division Multiple Addressing (Frequency Division Multiple Addressing) FDMA) system, Orthogonal Frequency-Division Multiple Access (OFDMA) system, single carrier FDMA

(SC-FDMA) system, General Packet Radio Service (GPRS) system, Long Term Evolution (LTE) system, and other such communication systems.

Various aspects are described herein in connection with a terminal and/or base station and/or base station controller.

The user terminal, which may be a wireless terminal or a wired terminal, may be a device that provides voice and/or data connectivity to the user, a handheld device with wireless connectivity, or other processing device connected to the wireless modem. The wireless terminal can communicate with one or more core networks via a Radio Access Network (RAN), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a mobile terminal. The computer, for example, can be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges language and/or data with the wireless access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, personal digital assistants

(Personal Digital Assistant, PDA for short). A wireless terminal may also be called a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, an Access Point, Remote Terminal, Access Terminal, User Terminal, User Agent, User Device, or User Equipment.

A base station (e.g., an access point) can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to exchange received air frames and IP packets with each other. The conversion, as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network may comprise an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the invention is not limited.

The base station controller may be a base station controller (BSC) in GSM or CDMA, or may be a radio network controller (RNC) in WCDMA, which is not limited in the present invention.

In addition, the terms "system," and "network" are often used interchangeably herein. In this document, the term "and/or" is merely an association that describes an associated object, indicating that there may be three relationships. For example, Α and / or Β, can mean: There are three cases of A, B and A, and B. In addition, the character "," in this paper, means that the context is an "or". relationship.

In this embodiment, the data part that is partially offloaded into one RB is transmitted via the secondary base station, and the part is transmitted via the primary base station; the data that is completely offloaded to one RB is all transmitted via the secondary base station.

This embodiment provides a data offload configuration method. As shown in FIG. 1 and FIG. 2, the method includes:

Step 101: The primary base station sends a first message to the secondary base station, where the first message is used to request data splitting from the secondary base station, where the first message includes an identifier of the radio bearer RB and a service quality requirement of the RB. The Qos parameter is configured to enable the secondary base station to determine a to-be-split RB and set configuration parameters for the to-be-split RB.

In this embodiment, the primary evolved NodeB (P-eNB) refers to the serving base station of the UE, and the secondary evolved NodeB (S-eNB) refers to the carrier aggregation of the UE and performs data offloading. Base station. In the architecture of this embodiment, the RAN side is connected to the SGW through the primary base station.

Before data offloading, first start the process of data offload configuration. After the primary base station decides to start data offloading, the primary base station sends the first message to the secondary base station through the X2 interface. For example, the first message may be a data offload request message, where the first message includes each

The RB identifier and the Quality of Service (Qos) parameter corresponding to each RB. In this embodiment, each RB identifier and the Qos parameter corresponding to each RB may be presented in the form of a list containing the offloaded RB, or may be presented in the form of an array. The Qos parameter may include any one of the following or any combination thereof: RB priority, whether it can be preempted, uplink maximum bit rate, uplink guaranteed bit rate, downlink maximum bit rate, downlink guaranteed bit rate, maximum allowable delay, and the like. After receiving the data offloading request message, the secondary base station sets configuration parameters for each RB to be offloaded according to the RB list, where the configuration parameter may include any one of the following or any combination thereof: Packet Data Convergence Protocol, abbreviated as PDCP) entity, Radio Link Control (RLC) entity, medium access control (MAC) entity, and physical layer (Phy).

Optionally, after receiving the first message, the secondary base station determines, according to its own load condition, which RBs are allowed to access, to determine which RBs need to be configured with configuration parameters, and after determining the RB to be offloaded, according to the The RB establishes a PDCP entity and an RLC entity for each RB to be offloaded according to the Qos parameter, and sets configuration parameters.

PDCP is a wireless transmission protocol stack in UMTS or LTE. It is usually responsible for compressing and decompressing IP headers, encrypting and decrypting data packets, transmitting user data, and maintaining a sequence of radio bearers set up for the Lossless Wireless Network Service Subsystem (SRNS). number. If the PDCP is configured as "no compression, no encryption and decryption", the PDCP entity will transparently process the data packet, that is, it will not process it. The RLC entity is located above the MAC entity and provides segmentation and retransmission services for user data.

In addition, the first message further includes: a traffic distribution type identifier, configured to indicate that the data offload transmission is a full offload or a partial offload. When the secondary base station sets configuration parameters for each RB, the configuration parameter can be used to know whether the data on a certain RB is completely offloaded or partially offloaded. Step 102: The primary base station receives a second message from the secondary base station, where the second message includes configuration parameters of the to-be-offloaded RB.

After the secondary base station sets the configuration parameters for each RB to be offloaded, the secondary base station sends a second message to the primary base station. The second message may be a data offload response message, where the data offload response message includes the to be offloaded. Configuration parameters for each RB. The primary base station receives the data offload response message.

In the above process, the configuration parameters set by the secondary base station are described in detail as follows:

The parameters of the PDCP entity include: The length of the discard Timer used by the secondary base station.

The parameters of the RLC entity may include any one of the following or any combination thereof:

- RLC mode of RB: AM or UM;

- RLC SN length used by the RB;

- RLC reordering timer length used by the RB receiver;

- The RLC status report used by the RB receiver disables the timer length;

- the maximum number of retransmissions of the RLC used by the RB sender;

- the number of packets triggered by the Poll used by the RB sender;

- the number of data bytes triggered by the Poll used by the RB sender;

- The length of the Poll retransmission timer used by the RB sender.

The parameters of the MAC entity may include any one of the following or any combination thereof:

- the priority of each logical channel participating in the offload;

- a logical channel group in which each logical channel participating in the offload is located;

- the maximum number of HARQ retransmissions of each RB at the secondary base station;

- the UE sends a periodic buffer status report (BSR) period length to the secondary base station;

- the length of the retransmission timer of the BSR sent by the UE to the secondary base station; - DRX parameters used by the UE in the secondary base station cell;

- the length of the TAT timer used by the UE in the secondary base station cell;

- the length of the periodic PHR timer used by the UE in the secondary base station cell;

- the PHR prohibition timer length used by the UE in the secondary base station cell; - the path loss change threshold sent by the PHR used by the UE in the secondary base station cell.

The parameters of the physical layer may include any one of the following or any combination thereof:

- a time-frequency domain location of the SR resource used by the UE in the secondary base station cell; - a time-frequency domain location of the CQI resource used by the UE in the secondary base station cell;

- the time-frequency domain location of the SRS resources used by the UE in the secondary base station cell,

Note: The above three parameters include period and offset in the time domain, and include frequency point information in the frequency domain;

- the location of the PRACH resource used by the UE in the secondary base station cell;

- the UE generates a relevant parameter in the preamble sequence used in the secondary base station cell;

- The length of the deactivation timer used by the UE in the secondary base station cell.

Step 103: The primary base station sends a third message to the user terminal UE, where the third message includes the identifier of the to-be-offloaded RB and the configuration parameter of the to-be-offered RB, so that the UE is the to-be-divided The RB establishes a second packet data convergence protocol PDCP entity and a second radio link control layer protocol RLC entity and performs data offload configuration.

The primary base station sends a third message to the UE. For example, the third message may be a data offload configuration message, where the data offload configuration message includes an RB identifier and a configuration parameter of the to be offloaded RB, and after receiving the data offload configuration message, the UE receives the data offload configuration message. According to the content of the message, for example, the RB identifier and the configuration parameter of the to-be-offered RB, the second PDCP entity and the second RLC entity are established for the to-be-split RB, where the UE has the first PDCP entity, the first RLC entity, and the MAC The entity, the second PDCP entity and the second RLC entity are located between the first RLC entity and the MAC entity of the UE, as shown in FIG. In addition, the third message may also include: a shunt class A type identifier is used to indicate that the data is split into a full split or a partial split.

It should be noted that the second PDCP entity of the UE logically corresponds to the PDCP entity of the secondary base station, and the second RLC entity of the UE logically corresponds to the RLC entity of the secondary base station. The first PDCP entity of the UE corresponds to the PDCP entity of the primary base station, and the first RLC entity of the UE corresponds to the RLC entity of the primary base station. The "correspondence" here is a logical relationship. Since the data is in the process of transmission, the primary base station and the secondary base station perform operations on the data, and the UE needs to perform corresponding inverse operations when receiving data, therefore, as shown in the figure As shown in Figure 3, from the perspective of the protocol stack structure, the two sides are logically equivalent.

Optionally, after establishing the second PDCP entity and the second RLC entity for each RB to be offloaded, the UE sends a data offload configuration response message to the primary base station to notify the primary base station that the establishment of the second PDCP entity and the second RLC entity is complete. , As shown in Figure 4. The primary base station receives the data offload configuration response message sent by the UE.

In the method of this embodiment, the process of processing the data to be offloaded in the prior art is changed by setting the second PDCP entity and the second RLC entity between the first RLC entity and the MAC entity of the UE, and the protocol modification is small, and The response to the change of the air interface measured at the bottom layer is faster, and the effect of dynamic shunting is better.

Further, in this embodiment, after the primary base station sends the data offload request message to the secondary base station, the secondary base station further determines whether a cell has been established for the UE:

If the secondary base station has established a cell for the UE, set a PDCP entity and an RLC entity for each RB in the list according to the Qos parameter, and set configuration parameters;

If the secondary base station does not establish a cell for the UE, the secondary base station establishes a cell for the UE to carry the RB, and the secondary base station establishes a PDCP entity and an RLC entity for each RB, and also establishes between the cell and the UE. Hybrid Automatic Repeat Request (HARQ) entity. Generally, eight HARQ entities need to be established in each cell to correspond to one UE.

Further, the data offload response message further includes: a preamble coding of the UE (a reamble), the preamble is allocated by the secondary base station after determining that the UE does not establish a connection and/or a synchronous connection with the secondary base station, and is configured to receive, by the primary base station, a data offload configuration sent by the UE. After the response message, the UE uses the preamble to initiate random access to a specific cell in the secondary base station to access the secondary base station. In this embodiment, the preamble may be allocated by a cell served by the secondary base station. Correspondingly, the data offload configuration message further includes a correspondence between the reamble and the reamble and the cell, so that the UE knows the preamble.

Further, the data offload response message further includes: a BSR threshold, where the BSR threshold is allocated by the secondary base station, and is used by the UE to report a BSR, where the BSR is used by the primary base station and/or the secondary base station The UE allocates an uplink transmission resource. . Correspondingly, the data offload configuration message further includes the BSR threshold, so that the UE knows the BSR threshold.

Further, after the primary base station sends the first message to the secondary base station, the method further includes: when the downlink data in the buffer of the secondary base station is lower than a buffer threshold set by the secondary base station, the primary base station receives the auxiliary Base station data request; or,

The primary base station sends data to the secondary base station according to the buffering situation of the secondary base station periodically reported by the secondary base station.

After the primary base station sends the data offload request message to the secondary base station, the secondary base station further sets a buffer threshold. When the downlink data in the buffer of the secondary base station is lower than the buffer threshold, the secondary base station requests data from the primary base station. . The buffer threshold does not need to notify the primary base station, nor does it need to notify the UE, and therefore does not need to be carried in the data offload response message, or the secondary base station periodically reports the buffer status of the secondary base station to the primary base station, And causing the primary base station to send data to the secondary base station according to the reported buffering situation.

Optionally, after the receiving, by the primary base station, the data offload configuration response message sent by the UE, the method further includes:

The primary base station receives a data offload configuration ready message from the secondary base station or the UE, and starts data offload transmission. The configuration of the secondary base station is completed and the UE and the secondary base After the station establishes a synchronous connection, it needs to notify the configuration of the control plane of the primary base station. The structure of each node before and after configuration is as shown in Figure 4. In this embodiment, the data offload configuration ready message may be sent by the UE or may be sent by the secondary base station. It should be noted that if the data offload configuration ready message is sent by the secondary base station, the primary base station may If the configuration is complete, if the primary base station receives the data offload configuration ready message, the primary base station needs to wait for the secondary base station to send a data offload configuration ready message before the data offloading can be performed.

In actual operation, if the air interface status of the secondary base station changes or other causes, the amount of data that the secondary base station can share varies. In this case, the X2 port can apply to the primary base station to adjust the data sharing amount and update the configuration parameters. The updated configuration parameters include the BSR threshold and the RB configuration parameters. The update process includes the following steps:

The primary base station receives the data offload configuration modification request from the secondary base station; and the data offload configuration modification request message includes the RB configuration parameter to be modified and the BSR threshold to be modified;

The primary base station or the secondary base station sends a data offload configuration modification message to the UE, where the data offload configuration modification message includes the RB configuration parameter to be modified and the BSR threshold to be modified.

Exemplarily, the update process can be as follows:

The first step: the secondary base station sends a data offload configuration modification request message to the primary base station, where the data offload configuration modification request message includes the RB configuration parameter to be modified and the BSR threshold. The second step: the secondary base station receives the data offload from the primary base station. Configure a modification request response message;

The third step: the secondary base station sends a data offload configuration modification message to the UE, where the data offload configuration modification message includes the RB configuration parameter to be modified and the BSR threshold.

Step 4: The secondary base station receives the data offload configuration modification response message returned by the UE.

As another implementation manner of the present invention, the update process may also be specifically: The first step: the primary base station receives the data offload configuration modification request from the secondary base station; and the data offload configuration modification request message includes the RB configuration parameter and the BSR threshold to be modified;

The second step: the primary base station sends a data offload configuration modification request response to the secondary base station; Xiao, 3⁄4; The third step: the primary base station sends a data offload configuration modification message to the UE, where the data offload configuration modification message includes the RB configuration to be modified. Parameters and BSR thresholds;

Step 4: The primary base station receives the data offload configuration modification response message returned by the UE.

On the basis of the foregoing data offloading configuration method, the embodiment further provides a downlink (SGW-UE) data transmission method. As shown in FIG. 5, the method in this embodiment is based on a partially offloaded downlink data transmission method. When the data offload type of the method is partial offload, the method includes:

Step 201: The PDCP entity of the primary base station receives data from the SGW, and processes the data to form first data.

First, it should be noted that the partial offload here means that the data part of one RB is transmitted via the secondary base station and partly transmitted via the primary base station.

Specifically, the processing performed by the PDCP entity of the primary base station includes data encryption and header compression. In this embodiment, only the primary base station receives data from the SGW, and the secondary base station does not receive data from the SGW.

Step 202: The RLC entity of the primary base station adds a first RLC sequence number to the first data, and forms a second data, and sends the offloaded data to be offloaded in the second data to the PDCP entity of the secondary base station.

The RLC entity of the primary base station adds the first RLC sequence number to the first data and sends it to the PDCP entity in the secondary base station. Exemplarily, as shown in FIG. 6, one RB packet is added with the sequence number "X+1" in the RLC entity of the primary base station, and the serial number "γ+1" is added to the RLC entity of the primary base station. Each RLC SDU corresponds to a single RLC sequence number.

Step 203: The PDCP entity of the secondary base station sends the offloaded data to the secondary base station. RLC entity.

Illustratively, after receiving the offloaded data from the primary base station, the PDCP entity of the secondary base station transparently processes the offloaded data, that is, does not process, and then sends the offloaded data to the RLC entity of the secondary base station. Since the basic functions of the PDCP entity have been implemented in the PDCP entity of the primary base station, such as data encryption, header compression, etc., the PDCP entity of the secondary base station can not process the offloaded data.

Step 204: The secondary base station processes the data to be offloaded, and sends the processed data to be offloaded to the UE.

As shown in FIG. 6, the secondary base station processes the data to be offloaded. Illustratively, first, the RLC entity of the secondary base station performs segmentation concatenation of the received offloaded data, and then adds a second RLC sequence number to form a third. Data, and the third data is sent to the MAC layer. The "segment cascading" of this embodiment includes three processes: segmentation, which is to segment and reassemble high-level PDU packets of different lengths into smaller RLC load units (PUs); cascading, when an RLC SDU When the content cannot fill a complete RLC PDU, the first segment of the next RLC SDU can also be placed in the PU, and the last segment of the previous RLC SDU is cascaded; padding, when the content of the RLC SDU cannot be filled When a full RLC PDU is full and cannot be cascaded, the remaining space can be filled with padding bits.

The RLC entity of the secondary base station segments the data packets in stages, and adds a second RLC sequence number to form a third data, that is, an RLC PDU. In the figure, the two RLC entities respectively add a sequence number to the data packet generated by itself. Κ+Γ, and "P+1", then sent to the MAC entity.

Specifically, the MAC entity of the secondary base station processes the third data, and then sends the third data to the physical layer, so that the physical layer (Phy) sends the processed third data to the user terminal. The "processing" here can be specifically multiplexed, that is, the third data corresponding to one or more RBs are combined. If a TTI receives only the third data sent by one RB, no multiplexing is required.

Packets from multiple RBs are formed after multiplexing by the MAC entity of the secondary base station The MAC PDU is finally sent to the physical layer for transmission. Exemplarily, as shown in FIG. 6, the MAC entity puts the data packets with the sequence numbers "Κ+Γ, and "P+1" in the same MAC PDU, and adds "MAC Header" to form a MAC PDU Finally, the physical layer sends the processed third data to the UE.

In the downlink data transmission method of the embodiment, when the data offload type is partially offloaded, the part of the offloaded data is transmitted to the PDCP entity of the secondary base station, and is sent to the UE by the secondary base station, when the air interface condition of the secondary base station changes. The MAC entity of the secondary base station can respond to the primary base station in time to implement dynamic offloading, and the modification of the protocol is small and easy to implement.

Optionally, after the RLC entity of the primary base station adds the first RLC sequence number to the first data, the method further includes:

The secondary base station pre-stores the second data to be offloaded in a cache of the RLC entity of the secondary base station.

In this embodiment, the secondary base station may pre-store the second data in the cache of the RLC entity of the secondary base station. When the amount of data in the buffer is lower than a certain threshold, some data is transmitted. When the scheduler of the secondary base station decides to transmit data, the data packet can be directly taken out from the buffer of the secondary base station, so that the processing speed can be speeded up.

Further, the RLC entity of the primary base station adds a first RLC sequence number to the first data, specifically:

The RLC entity of the primary base station performs segmentation concatenation processing on the first data, and adds a first RLC sequence number to the first data after the segmentation cascade.

In this embodiment, as shown in FIG. 7, the RLC entity of the primary base station performs concatenation processing on the first data, that is, several data packets from the PDCP entity are combined into one to form a larger data packet, but the maximum cannot be The maximum packet size exceeding the protocol requirement is 8188 Bytes. Exemplarily, in FIG. 7, the two RLC SDUs are concatenated into one RLC PDU and then sent to the PDCP entity of the secondary base station. The advantage of this approach is that multiple packets from the SGW share the primary base. A sequence number in the RLC entity of the station, so it occupies less RLC sequence number. When the amount of data is large and the air interface condition is good, the data delay caused by the restricted RLC window pushing is reduced.

It should be noted that the foregoing two technical features "the primary base station pre-stores the first data to be offloaded in the cache of the RLC entity of the secondary base station" and "the RLC entity of the primary base station cascades the first data. " , can be freely combined to implement, there are four implementations after the combination:

After the physical layer of the secondary base station sends the processed data to be offloaded, the physical layer of the UE receives the fourth data from the secondary base station, and the fourth data sequentially passes through the MAC entity, the second RLC entity, and the second PDCP entity of the UE. And processing by the first RLC entity and the first PDCP entity to form fifth data. The processing of the data packet by the UE is inverse to the processing of the data packet by the primary base station and the secondary base station, namely:

The physical layer of the UE receives the fourth data from the secondary base station;

The MAC entity of the UE divides each data packet of the fourth data into several RLC PDUs; the second RLC entity of the UE restores each RLC PDU to a data packet before the segmentation cascade, and removes the second RLC sequence number, and sends a second PDCP entity to the UE;

The second PDCP entity of the UE sends the restored data packet to the first RLC entity of the UE;

The first RLC entity of the UE removes the first RLC sequence number of the data packet, and restores the cascading packet to multiple packets, and then sends the first RCP sequence to the UE. The first PDCP entity of the UE restores the first process, obtains the fifth data, and finally obtains the data sent by the SGW.

The specific processing performed by the UE on the data packet can be analogized to the transmission method of the downlink data described above, and details are not described herein again.

The embodiment further provides a downlink data transmission method. As shown in FIG. 8, the method in this embodiment is based on a completely offloaded data transmission method, including:

Step 301: A PDCP entity of the primary base station receives data from the SGW, and processes the data to form first data.

First of all, it should be noted that the complete offloading here means that the data of one RB is all transmitted via the secondary base station.

Step 302: The RLC entity of the primary base station receives the first data, and sends the first data to a PDCP entity of the secondary base station.

In this embodiment, the RLC entity of the primary base station performs transparent processing on the first data, that is, does not perform any processing.

Step 303: The PDCP entity of the secondary base station receives the first data from the primary base station, and sends the first data to the RLC entity of the secondary base station.

After receiving the first data from the primary base station, the PDCP entity of the secondary base station transparently processes the first data, that is, does not perform any processing, and then sends the first data to the RLC entity of the secondary base station. Since the basic functions of the PDCP entity have been implemented in the PDCP entity of the primary base station, such as data encryption, header compression, etc., the PDCP entity of the secondary base station can not perform any processing on the offloaded data.

Step 304: The secondary base station processes the first data, and sends the processed first data to the UE. Optionally, the processing, by the secondary base station, the first data specifically includes the following content:

The RLC entity performs segmentation concatenation of the received first data, then adds a second RLC sequence number, forms third data, and sends the third data to the MAC entity. After processing the third data by the MAC entity of the secondary base station, the fourth data is formed, and the fourth data is sent to the physical layer, so that the physical layer sends the fourth data to the UE.

Here, "processing" may specifically be multiplexing, that is, combining the third data corresponding to one or more RBs. If a Transmission Time Interval (TTI) receives only the third data sent by one RB, no multiplexing is required.

In this embodiment, the RLC entity of the primary base station does not need to allocate the RLC sequence number to the data packet, which simplifies the processing flow, reduces the signaling overhead, and speeds up the data. transmission. The working principle of the primary and secondary base stations of the downlink data transmission method in this embodiment is the same as that of the foregoing embodiment, and details are not described herein again.

Further, the physical layer of the UE receives the fourth data from the secondary base station, where the fourth data is processed by the MAC entity of the UE, the second RLC entity, the second PDCP entity, the first RLC entity, and the first PDCP entity. Form the fifth data. The processing of the data packet by the UE and the processing of the data packet by the primary base station and the secondary base station are mutually reversed, and are not described herein again.

The embodiment further provides an uplink (UE-SGW) data transmission method. As shown in FIG. 9, the method in this embodiment is a method for transmitting uplink data, including:

Step 401: The UE reports the BSR to the primary base station and/or the secondary base station, so that the primary base station and/or the secondary base station allocates uplink transmission resources to the UE.

When the UE is in the upper BSR, the UE only sends the BSR to the primary base station for the RBs that do not participate in the offloading. For the RBs participating in the offloading, if configured to be partially offloaded, the UE preferentially sends the BSR to the secondary base station.

Further, when the data offloading type of the method is part of the offloading, the UE reports the BSR to the primary base station and/or the secondary base station, specifically: After determining that the total amount of the data to be transmitted is smaller than the pre-configured BSR threshold, the BSR is reported to the secondary base station; after determining that the total amount of the data to be offloaded is greater than the pre-configured BSR threshold, the BSR is reported to the secondary base station, and The primary base station reports the difference between the total amount of the offloaded data and the BSR threshold.

In other words, if the total amount of the data to be offloaded in the RBs that are to be used for the traffic is smaller than the pre-configured BSR threshold, the BSR is reported only to the secondary base station. If the total amount of data to be offloaded is greater than the BSR threshold, the BSR threshold is reported to the secondary base station. Data, other data is reported to the primary base station, that is, the BSR is reported to the secondary base station, and the difference between the total amount of the offloaded data and the BSR threshold is reported to the primary base station. If configured to be fully offloaded, only 4艮881 to the primary base station.

For example, as shown in FIG. 10, the BSR threshold is 600 Bytes. When the UE needs to report 800 Bytes, it reports 200 Bytes to the primary base station and 600 Bytes to the secondary base station. After receiving the BSR, the primary base station and the secondary base station allocate uplink transmission resources to the UE respectively, and the two base stations do not need to negotiate with each other.

Step 402: The first PDCP entity of the UE performs the first processing on the data to form the first data.

Specifically, the processing performed by the first PDCP entity includes data encryption and header compression. After receiving the uplink resource, if the uplink resource is allocated by the primary base station, the MAC entity directly requests data from the first RLC entity; if the uplink resource is allocated by the secondary base station, the MAC entity requests data from the second RLC entity. The second RLC entity then requests data from the first RLC entity.

Step 403: The first RLC entity of the UE performs segmentation concatenation of the first data, adds a first RLC sequence number, forms second data, and uses the second transmission data according to the received uplink transmission resource allocated by the secondary base station. The offloaded data to be offloaded is sent to the second PDCP entity.

In this embodiment, the first RLC entity of the UE performs segmentation concatenation of the first data, and then adds the first RLC sequence number to the second PDCP entity. Exemplarily, as shown in FIG. 10 and FIG. 11, as an implementation manner of the present invention, before the UE receives the uplink resource, Its data is stored in the cache of the main RLC. Exemplarily, the MAC entity receives the uplink resource allocated by the secondary base station, and after scheduling the decision, determines that one of the RBs transmits 150 bytes, and the other RB transmits 180 bytes. After the allocation information is transmitted to the first RLC entity via the second RLC entity, the first RLC entities of the two RBs respectively segment and concatenate the data packets in the cache, and add the first RLC sequence number to form two RLC PDUs. . One of the sizes is 150 Bytes, the first RLC number is "X+ 1", the other size is 180 Bytes, and the first RLC sequence number is "Y+ 1".

Step 404: The second PDCP entity of the UE sends the offload data to a second RLC entity of the UE.

After receiving the offloaded data, the second PDCP entity transparently processes the offloaded data, that is, does not perform any processing, and then sends the offloaded data to the second RLC entity. Since the basic functions of the PDCP entity have been implemented in the first PDCP entity, such as data encryption, header compression, etc., the second PDCP entity may not have to do any processing on the offloaded data.

Step 405: The second RLC entity of the UE adds the second RLC sequence number to the received offload data to form third data, and sends the third data to the MAC entity of the UE.

Specifically, after the RLC PDU is transparently transmitted from the PDCP layer, it reaches the secondary RLC layer. The two second RLC entities respectively add the second RLC sequence numbers to form the RLC PDUs. Illustratively, the two second RLC entities in FIG. 9 respectively add the second RLC to the data packets generated by themselves. The serial numbers "Κ+Γ, and "P+1" are then sent to the MAC entity.

Step 406: The physical layer of the UE sends the processed third data to the secondary base station. Specifically, the MAC entity of the UE processes the third data to form fourth data, and sends the fourth data to the physical layer, so that the physical layer sends the processed third data to the primary base station and/or Secondary base station. Exemplarily, as shown in FIG. 10, the MAC entity puts the data packets with the sequence numbers "Κ+Γ, and "P+1" in the same MAC PDU, and adds "MAC Header" to form a MAC PDU Finally, the physical layer transmits the fourth data to the primary base station and/or the secondary base station. Further, after the first RLC entity adds the first RLC sequence number to the first data, the method further includes:

The UE pre-stores the first data to be offloaded in a cache of the second RLC entity. Further, the first RLC entity adds a first RLC sequence number to the first data, which is:

The first RLC entity concatenates the first data and adds a first RLC sequence number to the concatenated first data.

In this embodiment, the first RLC entity performs concatenation processing on the first data, but does not perform segmentation, that is, several data packets from the first PDCP entity are combined into one to form a larger data packet, but the maximum The maximum size of the packet that cannot be exceeded by the protocol is 8188 Bytes. The advantage of this method is that multiple data packets share one sequence number in the first RLC entity, so that less RLC sequence numbers are occupied, and when the amount of data is large and the air interface condition is good, the limitation of RLC window pushing is reduced. The resulting data delay.

It should be noted that the above two technical features "the UE pre-stores the first data to be offloaded in the cache of the second RLC entity" and "the first RLC entity of the UE cascading the first data" , can be freely combined to implement, there are four implementations after the combination:

After the physical layer of the UE sends the fourth data, the physical layer of the secondary base station receives the fourth data from the UE, and the fourth data is sequentially processed by the MAC entity, the RLC entity, and the PDCP entity of the secondary base station, and the RLC of the primary base station. Processing of entities and PDCP entities, formation Fifth data.

The processing of the data packet by the primary base station and the secondary base station and the processing of the data packet by the UE are mutually reversed, and are not described herein again.

The embodiment further provides an uplink data transmission method. As shown in FIG. 12, the method includes: Step 501: A UE reports a BSR to a primary base station and/or a secondary base station, so that the primary base station and/or the secondary base station allocates uplinks to the UE. Transfer resources.

Step 502: The first PDCP entity of the UE receives data from the application layer, and processes the data to form the first data.

Step 503: The first RLC entity of the UE adds a first RLC sequence number to the first data, forms second data, and sends the offload data to be offloaded in the second data to the second PDCP entity.

Step 504: The second PDCP entity of the UE receives the offload data, and sends the offloaded data to a second RLC entity of the UE.

Step 505: The second RLC entity of the UE adds the second RLC sequence number to form the third data according to the received uplink transmission resource allocated by the secondary base station, and then adds the second RLC sequence to form the third data. Data is sent to the MAC entity;

Step 506: The physical layer of the UE sends the processed third data to the secondary base station.

Specifically, after processing, by the MAC entity of the UE, the third data, the fourth data is formed, and the fourth data is sent to the physical layer, so that the physical layer sends the fourth data to the secondary base station.

Different from the first uplink data transmission method, in this embodiment, before receiving the uplink transmission resource allocated by the secondary base station, the data enters the second PDCP entity, and therefore, the first RLC entity of the UE only has data. The packet is processed by a sequence number without segmentation of the data packet, and the work of segmenting the data packet requires a second RLC entity. In addition, the other steps of this embodiment are the same as the first uplink data transmission method, and are no longer used here. Narration.

Further, after the physical layer of the UE sends the fourth data, the physical layer of the secondary base station receives the fourth data from the UE, and the fourth data is sequentially processed by the MAC entity, the RLC entity, and the PDCP entity of the secondary base station, and the primary The processing of the RLC entity and the PDCP entity of the base station forms the fifth data. The processing of the data packet by the primary base station and the secondary base station is inverse to the processing of the data packet by the UE, and will not be described here.

After the first RLC entity of the UE adds the first RLC sequence number to the first data, the method further includes:

The UE pre-stores the first data to be offloaded in a cache of the second RLC entity. When the data offloading type of the method is a partial offload, the UE reports the BSR to the primary base station and/or the secondary base station, specifically:

After determining that the total amount of data to be transmitted is smaller than the pre-configured BSR threshold, the BSR is reported only to the secondary base station;

After determining that the total amount of the data to be offloaded is greater than the pre-configured BSR threshold, the BSR is reported to the secondary base station, and the difference between the total amount of the offloaded data and the BSR threshold is reported to the primary base station.

When the data offload type of the method is partially offloaded, the UE reports only to the primary base station.

BSR.

Corresponding to the embodiment of the foregoing data offloading configuration method, the embodiment further provides a base station, as shown in FIG. 13, including a transmitter 131 and a receiver 132, where

Transmitter 131 for:

Sending a first message to the secondary base station, where the first message is used to request data splitting from the secondary base station, where the first message includes an identifier of the radio bearer RB and a service quality requirement Qos parameter of the RB, so that Determining, by the secondary base station, a RB to be offloaded and setting configuration parameters for the to-be-split RB; and

Sending a third message to the user terminal UE, where the third message includes the identifier of the to-be-offered RB and the configuration parameter of the to-be-offered RB, so that the UE is the to-be-divided The RB establishes a second PDCP entity and a second RLC entity and performs a data offloading configuration; a receiver 132, configured to receive a second message from the secondary base station, where the second message includes configuration parameters of the to-be-split RB;

Further, the second message further includes: a buffer status report BSR threshold, where the BSR threshold is allocated by the secondary base station and used by the UE to report a BSR, where the BSR is used to enable the The primary base station and/or the secondary base station allocates uplink transmission resources to the UE.

Further, the receiver 132 is further configured to: when the downlink data in the buffer of the secondary base station is lower than a buffer threshold set by the secondary base station, receive a data request of the secondary base station;

The transmitter 131 is further configured to send data to the secondary base station according to a buffer condition of the secondary base station periodically reported by the secondary base station.

Further, the first message further includes: a traffic distribution type identifier, configured to indicate that the data traffic is completely offloaded or partially offloaded, where

The partial offloading refers to that the data portion of one RB is transmitted via the secondary base station, and is partially transmitted via the primary base station, and the complete offloading refers to that all data of one RB is transmitted via the secondary base station.

The present embodiment further provides a base station system, as shown in FIG. 14, including a primary base station 2 and a secondary base station 3. The primary base station includes a PDCP entity 21 and an RLC entity 22, and the secondary base station includes a PDCP entity 31 and an RLC entity 32. among them,

The PDCP entity 21 of the primary base station 2 is configured to receive data from the serving gateway SGW, and process the data to form first data, where the data transmission method is partial offloading;

The RLC entity 22 of the primary base station 2 is configured to add a first RLC to the first data. Serial number, forming second data, and sending the data to be offloaded in the second data to the PDCP entity of the secondary base station;

The PDCP entity 31 of the secondary base station 3 is configured to send the to-be-split data to the RLC entity 32 of the secondary base station 3;

The secondary base station 3 is configured to process the to-be-divided data, and send the processed to-be-split data to the UE.

Further, the RLC entity 22 of the primary base station 2 is further configured to perform segmentation concatenation processing on the first data, and add a first RLC sequence number to the first data after the segmentation cascade.

The primary base station in the base station system in this embodiment can perform the action of the primary base station in the foregoing method embodiment, and the secondary base station in the base station system can perform the action of the secondary base station in the foregoing method embodiment.

In the base station system of this embodiment, the partially-divided data is processed by the RLC entity of the primary base station, and then enters the PDCP entity of the secondary base station, and corresponds to the PDCP entity and the RLC entity of the secondary base station. The second PDCP entity and the second RLC entity are set between the RLC entity and the MAC entity, and the processing flow of the data to be offloaded in the prior art is changed, and the change of the air interface condition measured by the bottom layer is faster, and the dynamic shunting effect is better.

The present embodiment further provides a base station system, as shown in FIG. 14, including a primary base station 2 and a secondary base station 3. The primary base station includes a PDCP entity 21 and an RLC entity 22, and the secondary base station includes a PDCP entity 31 and an RLC entity 32. ,

The PDCP entity 21 of the primary base station 2 is configured to receive data from the serving gateway SGW, and process the data to form first data, where the data transmission method is completely offloaded;

The RLC entity 22 of the primary base station 2 is configured to receive the first data, and send the first data to the PDCP entity 31 of the secondary base station 3;

The PDCP entity 31 of the secondary base station 3 is configured to receive the first data from the primary base station 2, and send the first data to the RLC entity 32 of the secondary base station 3; The secondary base station 3 processes the first data, and sends the processed first data to the UE.

In this embodiment, the data that is completely offloaded does not need to be transmitted through the primary base station. Therefore, the RLC entity of the primary base station does not need to allocate the RLC sequence number to the data packet, which simplifies the processing flow, reduces signaling overhead, and speeds up data. Transmission. In addition, corresponding to the PDCP entity and the RLC entity of the secondary base station, the present embodiment sets a second PDCP entity and a second RLC entity between the first RLC entity and the MAC entity of the UE, and changes the data to be offloaded in the prior art. The processing flow has a faster response to the changes in the air interface measured at the bottom layer, and the dynamic shunting effect is better.

The present embodiment further provides a user terminal, as shown in FIG. 15, including a first PDCP entity 41, a first RLC entity 42, a MAC entity 43, and a physical layer 44, and further includes: a BSR reporting unit 40 and a second PDCP entity 45. And a second RLC entity 46, the second PDCP entity 45 and the second RLC entity 46 being located between the first RLC entity 42 and the MAC 43 of the UE, where

The BSR reporting unit 40 is configured to report the BSR to the primary base station and/or the secondary base station, so that the primary base station and/or the secondary base station allocate uplink transmission resources for the U E;

a first PDCP entity 41, configured to perform first processing on the data to form first data;

The first RLC entity 42 is configured to perform segmentation concatenation of the first data, add a first RLC sequence number, form second data, and send the second data according to the received uplink transmission resource allocated by the secondary base station. The offloaded data to be offloaded is sent to the second PDCP entity 45;

a second PDCP entity, configured to send the offloaded data to a second RLC entity 46 of the UE;

a second RLC entity 46, configured to add the received offload data to the second RLC Sequence number, forming third data, and sending the third data to the MAC entity 43 of the UE;

The physical layer 44 of the UE is configured to send the processed third data to the secondary base station.

Further, when the data offloading method is partially offloaded, the BSR reporting unit is specifically configured to:

After determining that the total amount of data to be transmitted is less than a pre-configured BSR threshold, reporting the BSR to the secondary base station; or

The UE in the base station system in this embodiment may perform the action of the UE in the foregoing method embodiment. The user terminal in the embodiment of the present invention, by setting a second PDCP entity and a second RLC entity between the first RLC entity and the MAC entity, and the second PDCP entity logically corresponds to the PDCP entity of the secondary base station, and the second RLC entity and the secondary The RLC entity of the base station logically corresponds to change the processing flow of the data to be shunted in the prior art, and the response to the air interface condition measured by the bottom layer is faster, and the dynamic shunting effect is better.

The present embodiment further provides a user terminal, as shown in FIG. 15, including a first PDCP entity 41, a first RLC entity 42, a MAC entity 43, and a physical layer 44, and further includes: a BSR reporting unit 40 and a second PDCP entity 45. And a second RLC entity 46, the second PDCP entity 45 and the second RLC entity 46 being located between the first RLC entity 42 and the MAC 43 of the UE,

a first PDCP entity 41, configured to perform first processing on the data to form first data; The first RLC entity 42 is configured to add a first RLC sequence number to the first data, form second data, and send the offloaded data to be offloaded in the second data to the second PDCP entity 45 of the UE;

a second PDCP entity 45, configured to send the offloaded data to a second RLC entity 46 of the UE;

The second RLC entity 46 is configured to add the second RLC sequence number to form the third data according to the received uplink transmission resource allocated by the secondary base station, and then add the second RLC sequence to form the third data. Sent to the MAC entity 43;

The physical layer 44 is configured to send the processed third data to the secondary base station.

After determining that the total amount of data to be transmitted is less than a pre-configured BSR threshold, reporting the BSR to the secondary base station;

The working principles and working processes of the physical units in this embodiment are the same as those in the foregoing method embodiments, and are not described herein again.

It will be clearly understood by those skilled in the art that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above-mentioned work can be performed as needed. The allocation can be done by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the system, the device and the unit described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed. Alternatively, the coupling or direct coupling or communication connection between the various components shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software function unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), and a random access memory (RAM, Random Access). A medium that can store program code, such as a Memory), a disk, or an optical disk.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

A data distribution configuration method, comprising:

The primary base station sends a third message to the user terminal UE, where the third message includes the identifier of the to-be-offered RB and the configuration parameter of the to-be-offered RB, so that the UE establishes the a packet data convergence protocol PDCP entity and a second radio link control layer protocol RLC entity and performing data offload configuration;

The UE has a first PDCP entity, a first RLC entity, and a medium access control MAC entity, where the second PDCP entity and the second RLC entity are located between the first RLC entity and the MAC entity.

The data offloading configuration method according to claim 1, wherein the second PDCP entity of the UE and the PDCP entity of the secondary base station are logically corresponding, the second RLC entity of the UE and the secondary base station The RLC entity logically corresponds.

The data offloading configuration method according to claim 1 or 2, wherein the second message further includes: a buffer status report BSR threshold, where the BSR threshold is allocated by the secondary base station The BSR is used by the UE to report the BSR, and the BSR is used by the primary base station and/or the secondary base station to allocate uplink transmission resources to the UE.

The data offloading configuration method according to any one of claims 1 to 3, wherein after the primary base station sends the first message to the secondary base station, the method further includes:

When the downlink data in the buffer of the secondary base station is lower than the buffer threshold set by the secondary base station Receiving, by the primary base station, a data request of the secondary base station; or

The primary base station sends data to the secondary base station according to the buffer status of the secondary base station periodically reported by the secondary base station.

The data offloading configuration method according to any one of claims 1 to 4, wherein after the primary base station sends the first message to the secondary base station, the method further includes:

The secondary base station determines whether a cell has been established for the UE,

If no cell is established for the UE, the secondary base station establishes a cell for the UE.

The data offloading configuration method according to any one of claims 1 to 5, wherein the second message further comprises: a preamble encoding preamble of the UE;

When the secondary base station determines that the UE does not establish a connection and/or a synchronous connection with the secondary base station, the preamble is allocated by the secondary base station, and is used by the UE to initiate randomization to the secondary base station according to the reamble. Access.

The data offloading configuration method according to claim 6, wherein the third message further includes the reamble

The data offloading configuration method according to claim 3, wherein the third message further includes the BSR threshold.

The data offloading configuration method according to any one of claims 1 to 8, wherein the first message further includes: a split type identifier, configured to indicate that the data offload is completely offloaded or partially offloaded;

The data part that is partially offloaded into one RB is transmitted via the secondary base station, and is partially transmitted via the primary base station;

The data completely shunted into one RB is all transmitted via the secondary base station.

The data offloading configuration method according to any one of claims 1 to 9, wherein the third message further comprises: a split type identifier, configured to indicate that the data offload is a full offload or a partial offload.

The data distribution configuration method according to any one of claims 1 to 10, characterized in that It also includes:

The primary base station receives a data offload configuration modification request message from the secondary base station, where the data offload configuration modification request message includes an RB configuration parameter to be modified and a BSR threshold to be modified;

12. A downlink data transmission method, comprising:

The secondary base station processes the data to be offloaded, and sends the processed data to be offloaded to the UE.

The downlink data transmission method according to claim 12, wherein the RLC entity of the primary base station adds a first RLC sequence number to the first data, and after forming the second data, the method further includes:

The secondary base station pre-stores the second data in a cache of an RLC entity of the secondary base station.

The downlink data transmission method according to claim 12 or 13, wherein the RLC entity of the primary base station adds a first RLC sequence number to the first data, specifically: an RLC entity pair of the primary base station The first data is subjected to segmentation and cascade processing, and the points are given The first data after the segment is cascaded adds a first RLC sequence number.

The downlink data transmission method according to any one of claims 12 to 14, wherein the method further comprises:

The secondary base station transmits fourth data to the UE, where the fourth data is processed by the MAC entity of the UE, the second RLC entity, the second PDCP entity, the first RLC entity, and the first PDCP entity.

A downlink data transmission method, comprising:

The PDCP entity of the primary base station receives the data from the serving gateway SGW, and processes the data to form the first data. The data offload type of the method is complete offloading, and the complete offload refers to all data of one RB. Transmitted via the secondary base station, ;

The secondary base station processes the first data, and sends the processed first data to

UE.

The downlink data transmission method according to claim 16, further comprising:

18. An uplink data transmission method, comprising:

The UE reports the BSR to the primary base station and/or the secondary base station, so that the primary base station and/or the secondary base station allocates uplink transmission resources to the UE;

The first PDCP entity of the UE processes the received data to form the first data; the first RLC entity of the UE segments the first data into segments, adding the first And the second data is formed by the RLC sequence number, and the data to be offloaded in the second data is sent to the second PDCP entity according to the received uplink transmission resource allocated by the secondary base station;

The second RLC entity of the UE adds the second RLC sequence number to the received data to be offloaded, forms third data, and sends the third data to the MAC entity of the UE; Transmitting the processed third data to the secondary base station.

The uplink data transmission method according to claim 18, wherein, when the data offload type of the method is a partial offload, the UE reports a BSR to the primary base station and/or the secondary base station, specifically:

20. An uplink data transmission method, comprising:

The first PDCP entity of the UE processes the received data to form first data; the first RLC entity of the UE adds a first RLC sequence number to the first data, forms a second data, and the foregoing The second PDCP entity to be offloaded to the UE in the second data; the second PDCP entity of the UE sends the to-be-split data to the second RLC entity of the UE;

The second RLC entity of the UE adds the second RLC sequence number to form the third data according to the received uplink transmission resource allocated by the secondary base station, and then adds the second RLC sequence number to form the third data. Three data are sent to the MAC entity of the UE;

The physical layer of the UE sends the processed third data to the secondary base station.

The uplink data transmission method according to claim 20, further comprising: after the first RLC entity of the UE adds the first RLC sequence number to the first data,

The UE pre-stores the first data in a buffer of the second RLC entity.

The uplink data transmission method according to claim 20, wherein, when the data offload type of the method is a partial offload, the UE reports a BSR to the primary base station and/or the secondary base station, specifically:

After determining that the total amount of the data to be transmitted is smaller than the pre-configured BSR threshold, reporting the BSR to the secondary base station;

A base station, comprising:

Transmitter for:

Sending a third message to the user terminal UE, where the third message includes the identifier of the to-be-offered RB and the configuration parameter of the to-be-offered RB, so that the UE establishes a second PDCP entity for the to-be-offloaded RB and a second RLC entity and performing data offload configuration;

The base station according to claim 23, wherein the second message further includes: a buffer status report BSR threshold, where the BSR threshold is allocated by the secondary base station The BSR is used for the UE to report the BSR, and the BSR is configured to enable the primary base station and/or the secondary base station to allocate uplink transmission resources to the UE.

The base station according to any one of claims 23 to 24, wherein the receiver is further configured to: when downlink data in a buffer of the secondary base station is lower than a buffer threshold set by the secondary base station Receiving a data request of the secondary base station;

The transmitter is further configured to send data to the secondary base station according to the cache condition of the secondary base station periodically reported by the secondary base station.

The base station according to any one of claims 23 to 25, wherein the first message further includes: a traffic distribution type identifier, configured to indicate that the data offload is completely offloaded or partially offloaded, where

The partial offloading means that the data part of one RB is transmitted via the secondary base station, and partly transmitted via the primary base station, and the complete offloading means that all data of one RB is transmitted via the secondary base station.

A base station system, comprising a primary base station and a secondary base station, the primary base station comprising a PDCP entity and an RLC entity, the secondary base station comprising a PDCP entity and an RLC entity, wherein the PDCP entity of the primary base station is configured to receive Data from the serving gateway SGW, and processing the data to form first data, wherein the data transmission method is partial offloading;

The secondary base station is configured to process the data to be offloaded, and send the processed data to be offloaded to the UE.

28. The base station system according to claim 27, wherein The RLC entity of the primary base station is further configured to perform segmentation and concatenation processing on the first data, and add a first RLC sequence number to the first data in the segmentation cascade.

A base station system, comprising a primary base station and a secondary base station, the primary base station comprising a PDCP entity and an RLC entity, the secondary base station comprising a PDCP entity and an RLC entity, wherein the PDCP entity of the primary base station is configured to receive Data from the serving gateway SGW, and processing the data to form first data, wherein the data transmission method is completely offloaded;

UE.

30. A user terminal, including a first PDCP entity, a first RLC entity, a MAC entity, and a physical layer, further comprising: a 881 upper unit, a second PDCP entity, and a second RLC entity, The second PDCP entity and the second RLC entity are located between the first RLC entity of the UE and the MAC,

The BSR reporting unit is configured to report a BSR to the primary base station and/or the secondary base station, so that the primary base station and/or the secondary base station allocate uplink transmission resources for the U E;

The first PDCP entity is configured to process the received data to form the first data. The first RLC entity is configured to perform segmentation concatenation of the first data, add a first RLC sequence number, and form a first Transmitting, to the second PDCP entity, the data to be offloaded in the second data according to the received uplink transmission resource allocated by the secondary base station;

The second PDCP entity, configured to send the offloaded data to a second RLC entity of the UE;

The second RLC entity is configured to add the received data to be offloaded to the second RLC. The serial number is formed, and the third data is sent to the MAC entity of the UE. The physical layer of the UE is configured to send the processed third data to the secondary base station.

The user terminal according to claim 30, wherein when the data offloading method is partially offloaded, the unit on the BSR is specifically configured to:

32. A user terminal, including a first PDCP entity, a first RLC entity, a MAC entity, and a physical layer, further comprising: a 881 upper unit, a second PDCP entity, and a second RLC entity, The second PDCP entity and the second RLC entity are located between the first RLC entity of the UE and the MAC,

The first PDCP entity is configured to process the received data to form first data, where the first RLC entity is configured to add a first RLC sequence number to the first data, to form a second data, and Transmitting, to the second PDCP entity, the data to be offloaded to the UE in the second data;

The physical layer of the UE is configured to send the processed third data to the secondary base station.

The user terminal according to claim 32, wherein when the data offloading method is partially offloaded, the BSR unit is specifically configured to: After determining that the total amount of the data to be transmitted is smaller than the pre-configured BSR threshold, reporting the BSR to the secondary base station;