WO2017024581A1

WO2017024581A1 - Data transmission method, base station, and user equipment

Info

Publication number: WO2017024581A1
Application number: PCT/CN2015/086840
Authority: WO
Inventors: 彭文杰; 张宏卓
Original assignee: 华为技术有限公司
Priority date: 2015-08-13
Filing date: 2015-08-13
Publication date: 2017-02-16
Also published as: CN107736051A

Abstract

The present invention provides a data transmission method, a base station and a user equipment, so as to prevent data loss in an LTE-WLAN aggregation process. The method in an embodiment of the present invention comprises: a base station acquires a first data loss indication parameter and a second data loss indication parameter of a UE, the first data loss indication parameter being used for indicating PDCP PDUs that are determined by a UE to be lost, the second data loss indication parameter being used for indicating a first highest serial number, and the first highest serial number being a highest serial number of the PDCP PDUs received by the UE; and the base station determines, according to the first data loss indication parameter and the first highest serial number, PDCP PDUs that are not received by the UE, and sends the PDCP PDUs that are not received to the UE. By means of the embodiments of the present invention, a base station can determine, according to a first data loss indication parameter and a second data loss indication parameter, all PDCP PDUs that are lost by the UE, and retransmits the PDCP PDUs to the UE, and accordingly data loss in an LTE-WLAN aggregation process can be prevented.

Description

Data transmission method, base station and user equipment

Technical field

The present invention relates to the field of wireless communications, and in particular, to a data transmission method, a base station, and a user equipment.

Background technique

With the explosive growth of data traffic in mobile services, traditional cellular networks are increasingly difficult to meet the demand for data traffic growth. Mobile operators cooperate with cellular networks and non-cellular networks to alleviate the pressure on cellular data traffic, such as non-cellular networks such as wireless local area networks (WLANs) and long-term evolution (LTE, Long Term). The LTE network and the WLAN can cooperate with each other. The LTE network can cooperate with the WLAN. The technical principle is that the user equipment (User Equipment, UE) can use both the LTE link and the WLAN link. Communication can significantly increase the user's throughput.

In an LTE-WLAN convergence scenario, an evolved Node B (eNB) is connected to a wireless access point (AP) through a WLAN Termination (WT), and the eNB may be connected to multiple WTs. The WT is connected to at least one AP.

On the data plane, the interface between the WT and the eNB is in the Packet Data Convergence Protocol (PDCP) layer of the eNB. In the LTE-WLAN aggregation, the data is carried in the PDCP layer to form a PDCP protocol data unit (PDU). A data transmission method is that all PDCP PDUs are distributed to the WLAN for transmission. Specifically, the PDCP PDU is sent to the AP connected to the UE via the WT, and is sent by the AP to the UE; the other is that the PDCP PDU is partially distributed to the UE. The WLAN transmits, and some of them are still transmitted by LTE. The UE simultaneously accepts data on the LTE link and data on the WLAN link, and finally aggregates at the PDCP layer.

With the existing LTE-WLAN aggregation technology, the WT cannot report the PDCP PDU transmitted to the UE through the WLAN link to the eNB, and the PDCP status report fed back by the UE to the eNB includes only the PDCP PDU that the UE itself confirms to be lost. The existing PDCP status report that relies solely on UE feedback cannot confirm all the lost data, and thus the UE business continuity is impaired.

Summary of the invention

The present invention provides a data transmission method, a base station, and a user equipment, which can prevent data loss during LTE-WLAN aggregation.

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

The base station acquires a first data loss indication parameter and a second data loss indication parameter of the user equipment UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication parameter is used. Indicates a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE;

Determining, by the base station, the PDCP PDU that is not received by the UE according to the first data loss indication parameter and the first highest sequence number;

The base station sends the PDCP PDU that the UE does not receive to the UE.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the base station, the PDCP PDU that is not received by the UE according to the first data loss indication parameter and the first highest sequence number includes: determining, by the base station, the second highest sequence number The second highest sequence number is the highest sequence number of the PDCP PDU that the base station sends to the UE, where the PDCP PDU sent to the UE is a PDCP PDU that is sent to the UE through the Long Term Evolution (LTE) link or the WLAN Endpoint WT; Comparing the second highest sequence number with the first highest sequence number to determine a first PDCP PDU that the UE does not receive, and the first PDCP PDU that is not received is a PDCP PDU sent by the base station by using the WT; the base station is lost according to the first data. The indication parameter determines a second PDCP PDU that the UE has not received.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the acquiring, by the base station, the second data loss indication parameter of the UE includes: when the base station disconnects from the WT, the base station sends The UE sends a status request message, where the status request message is used to request the UE to send a second data loss indication parameter to the base station, and the base station receives the second data loss indication parameter sent by the UE; or the base station receives the second data loss indication parameter sent by the UE, The second data loss indication parameter is sent when the UE meets the preset condition; or the base station receives the second data loss indication parameter periodically reported by the UE.

In conjunction with the first aspect, the first possible implementation of the first aspect, or any possible implementation of the second possible implementation of the first aspect, in a third possible implementation of the first aspect The first data loss indication parameter and the second data loss indication parameter are located in the same PDCP status report frame.

In conjunction with the third possible implementation of the first aspect, in a fourth possible implementation manner of the first aspect, the PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to indicate that the base station is The second data loss indication parameter is read in the PDCP status report frame.

In conjunction with the first aspect, the first possible implementation of the first aspect, or any possible implementation of the second possible implementation of the first aspect, in a fifth possible implementation of the first aspect The first data loss indication parameter is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the second PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to indicate the base station A second data loss indication parameter is read from the second PDCP status report frame.

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

The user equipment UE sends a first data loss indication parameter and a second data loss indication parameter to the base station, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication parameter is used. Indicates a first highest sequence number, where the first highest sequence number is the highest sequence number of the PDCP PDU received by the UE, and the first data loss indication parameter and the first highest sequence number are used to enable the base station to determine the PDCP PDU that the UE does not receive, and The unreceived PDCP PDU is sent to the UE; the UE receives the unreceived PDCP PDU sent by the base station.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the sending, by the UE, the second data loss indication parameter to the base station includes: when the UE receives the status request message sent by the base station, the UE sends the second data to the base station. If the UE meets the preset condition, the UE sends a second data loss indication parameter to the base station; or the UE periodically reports the second data loss indication parameter to the base station.

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 first data loss indication parameter and the second data loss indication parameter are in the same PDCP status report. In the frame.

With reference to the second possible implementation of the second aspect, in a third possible implementation manner of the second aspect, the PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to indicate the base station from the PDCP Reading a second data loss indication parameter in the status report frame;

In combination with the second aspect or the first possible implementation of the second aspect, the fourth aspect of the second aspect In a possible implementation manner, the first data loss indication parameter is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame.

With reference to the fourth possible implementation of the second aspect, in a fifth possible implementation manner of the second aspect, the second PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to indicate the base station from The second data loss indication parameter is read in the second PDCP status report frame.

In a third aspect, an embodiment of the present invention provides a base station, including:

An acquiring unit, configured to acquire a first data loss indication parameter and a second data loss indication parameter of the user equipment UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data is lost. The indication parameter is used to indicate the first highest sequence number, the first highest sequence number is the highest sequence number of the PDCP PDU received by the UE, and the processing unit is configured to determine, according to the first data loss indication parameter and the first highest sequence number, that the UE does not receive the The PDCP PDU is sent by the sending unit, and the PDCP PDU that is not received by the UE is sent to the UE.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the processing unit is specifically configured to determine a second highest sequence number, where the second highest sequence number is a highest sequence number of the PDCP PDU sent by the base station to the UE, where The PDCP PDU sent to the UE is a PDCP PDU that is sent to the UE through the Long Term Evolution (LTE) link or the WLAN Endpoint WT, and the second highest sequence number is compared with the first highest sequence number to determine that the UE does not receive. The first PDCP PDU that is not received is the PDCP PDU that the base station sends through the WT, and determines the second PDCP PDU that the UE does not receive according to the first data loss indication parameter.

In conjunction with the first possible implementation of the third aspect, in a second possible implementation manner of the third aspect, the sending unit is further configured to: when disconnecting from the WT, send a status request message to the UE, the status request message The acquiring unit is configured to send a second data loss indication parameter to the base station, where the acquiring unit is specifically configured to receive the second data loss indication parameter sent by the UE.

With reference to the third aspect, the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the acquiring unit is specifically configured to obtain The first data loss indication parameter and the second data loss indication parameter of the UE, where the first data loss indication parameter and the second data loss indication parameter are located in the same PDCP status report frame.

With reference to the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the acquiring unit is configured to acquire the first data loss indication parameter and the second data loss of the UE. And the indication parameter, wherein the first data loss indication parameter and the second data loss indication parameter are located in the same PDCP status report frame, and the PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to indicate the base station from the PDCP The second data loss indication parameter is read in the status report frame.

With reference to the third aspect, the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the acquiring unit is specifically configured to obtain a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame.

With reference to the fifth possible implementation manner of the third aspect, in a sixth possible implementation manner of the third aspect, the acquiring unit is configured to acquire the first data loss indication parameter and the second data loss indication parameter of the UE, The first data loss indication parameter is located in the first PDCP status report frame, the second data loss indication parameter is located in the second PDCP status report frame, and the second PDCP status report frame further includes a read indication parameter and a read indication parameter. And configured to instruct the base station to read the second data loss indication parameter from the second PDCP status report frame.

In a fourth aspect, an embodiment of the present invention provides a user equipment, including:

a sending unit, configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication parameter And indicating a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE, where the first data loss indication parameter and the first highest sequence number are used to enable the base station to determine the PDCP PDU that the UE does not receive. The unreceived PDCP PDU is sent to the UE, and the receiving unit is configured to receive the unreceived PDCP PDU sent by the base station.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the sending unit is configured to: when the receiving unit receives the status request message sent by the base station, send the second data loss indication parameter to the base station.

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 sending unit is configured to send the first data loss indication parameter and the second data to the base station The indication parameter is lost, wherein the first data loss indication parameter and the second data loss indication parameter are located in the same PDCP status report frame.

In conjunction with the second possible implementation of the fourth aspect, a third possible implementation in the fourth aspect The sending unit is configured to send a first data loss indication parameter and a second data loss indication parameter to the base station, where the first data loss indication parameter and the second data loss indication parameter are in the same PDCP status report frame, and the PDCP status is The report frame further includes a read indication parameter, and the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the PDCP status report frame.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the sending unit is configured to send the first data loss indication parameter and the second data to the base station The indication parameter is lost, wherein the first data loss indication parameter is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame.

With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the sending unit is configured to send the first data loss indication parameter and the second data loss indication parameter to the base station, The first data loss indication parameter is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame. In addition, the second PDCP status report frame further includes a read indication parameter, and the read The indication parameter is used to instruct the base station to read the second data loss indication parameter from the second PDCP status report frame.

It can be seen from the above technical solutions that the solution of the embodiment of the present invention has the following beneficial effects:

In the embodiment of the present invention, the base station acquires the first data loss indication parameter and the second data loss indication parameter of the UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost PDCP PDU, the first highest sequence number, and the first highest sequence. The number is the highest sequence number of the PDCP PDU received by the UE, and the base station determines the PDCP PDU that the UE does not receive according to the first data loss indication parameter and the first highest sequence number, and then sends the unreceived PDCP PDU to the UE. According to the embodiment of the present invention, the base station can confirm all the PDCP PDUs lost by the UE according to the first data loss indication parameter and the second data loss indication parameter sent by the UE, and retransmit the same to the UE, thereby preventing the LTE-WLAN aggregation process. The data in it is lost.

DRAWINGS

1 is a schematic structural diagram of an LTE-WLAN aggregation network according to an embodiment of the present invention;

2 is a specific process of an eNB transmitting data through an LTE link and a WLAN link according to an embodiment of the present invention;

3 is a flowchart of a data transmission method according to an embodiment of the present invention;

4 is another flowchart of a data transmission method according to an embodiment of the present invention;

5 is a PDCP status report frame structure when the SN length is 12 bits;

6 is a PDCP status report frame structure when the SN length is 15 bits;

7 is a PDCP status report frame structure when the SN length of the frame structure extended in FIG. 5 is 12 bits;

8 is a PDCP status report frame structure when the SN length is 15 bits after the frame structure in FIG. 6 is extended;

9 is another PDCP status report frame structure when the SN length is 12 bits;

10 is another PDCP status report frame structure when the SN length is 12 bits;

11 is another PDCP status report frame structure when the SN length is 15 bits;

FIG. 12 is another flowchart of a data transmission method according to an embodiment of the present invention; FIG.

FIG. 13 is another flowchart of a data transmission method according to an embodiment of the present invention; FIG.

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

FIG. 15 is a schematic diagram of another functional module of a base station according to an embodiment of the present invention; FIG.

FIG. 16 is a schematic diagram of a functional module of a user equipment according to an embodiment of the present invention;

FIG. 17 is a schematic diagram of another functional module of a user equipment according to an embodiment of the present invention;

FIG. 18 is a schematic structural diagram of a hardware of a base station according to an embodiment of the present invention;

FIG. 19 is a schematic structural diagram of hardware of a user equipment 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, based on All other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present invention.

The embodiment of the present invention can be applied to the aggregation process of the LTE and the WLAN, and can also be applied to the convergence process of the LTE and the WLAN. In the embodiment of the present invention, the convergence technology of the LTE and the WLAN is taken as an example for description.

The LTE-WLAN aggregation in the embodiment of the present invention may also be referred to as LTE-WLAN Multiple Stream Aggregation (LTE-WLAN MSA), LTE-WLAN. LTE-WLAN Dual Integration (LTE-WLAN Radio Integration), LTE-WLAN Radio Integration (LTE-WLAN Radio Integration).

In the LTE-WLAN aggregation scenario, the following network elements are included: a Mobility Management Entity (MME), an eNB, a UE, and a WT.

The UE involved in the present invention may include a handheld device having a wireless communication function, an in-vehicle device, a wearable device, a computing device, or other processing device connected to the wireless modem, and various forms of User Equipment (UE). Mobile station (MS), terminal, terminal equipment, etc. For convenience of description, in the present application, it is simply referred to as a user equipment or a UE.

It should also be understood that the WT involved in the embodiment of the present invention is a logical node connecting an eNB of an LTE network and an AP of a WLAN network. The WT may be integrated with an Access Controller (AC) or an Access Point (AP), or may be an independent node capable of communicating with an AP or an AC. Make a limit.

1 is a schematic diagram of an LTE-WLAN aggregation network architecture. As shown in the figure, an eNB is connected to a WLAN AP through a WT, an eNB can be connected to multiple WTs, and a WT is connected to at least one AP. In the following behavior example, when LTE and WLAN are aggregated, the data arrives at the eNB (the link shown in FIG. 101) via the core network, and the eNB sends a part of the data to the UE through the LTE link (the link shown in FIG. 102). A part of the data is sent to the UE through the WLAN link (the link shown in FIG. 103). Specifically, the eNB distributes the WT to the WT. The WT is sent to the AP connected to the UE, and then sent by the AP to the UE. Similar to the uplink data transmission, the UE simultaneously transmits data to the network using the LTE link (the link shown in FIG. 102) and the WLAN link (the link shown in FIG. 103).

In the existing LTE-WLAN convergence technology, the WT cannot feed back the PDCP PDU to the eNB in the WLAN link, and the existing PDCP status report of the UE can only feedback the UE to confirm the lost PDCP PDU. The specific process of transmitting data through the LTE link and the WLAN link is as follows: as shown in FIG. 2, the eNB sends a PDCP PDU whose sequence number (Serial Number, SN) is 1, 2, 3, 4 to the UE through the LTE link. The PDCP PDUs with the SNs of 5, 6, 7, and 8 are distributed to the WLAN link and sent to the UE. The UE simultaneously receives data on the LTE link and the WLAN link, and successfully receives the SNs as 1, 2, 3, and 4. After the 5, 7 PDCP PDU, the original WT is released Or the WT changes. At this time, there is no information feedback between the WT and the eNB, and the eNB can only receive the PDCP status report of the UE. For the UE, the UE can only confirm that the PDCP PDU with the SN is 6 is lost based on the received PDCP PDU. Therefore, the PDCP status report sent to the eNB only carries the SN 6. After the eNB receives the status report fed back by the UE, A PDCP PDU with a SN of 6 is sent to the UE, and a PDCP PDU with a SN of 8 is successfully received by the UE, resulting in data loss on the UE side.

The embodiment of the invention provides a data transmission method, which can prevent data loss of the eNB from being sent to the UE from the WLAN link. With reference to FIG. 3, an embodiment of the present invention includes:

301. The base station acquires a first data loss indication parameter and a second data loss indication parameter of the UE.

The base station eNB transmits data to the UE through the LTE link and the WLAN link, and the UE receives data transmitted by the eNB through the LTE link and the WLAN link, in the process, due to wireless signal attenuation, signal interference, bandwidth bottleneck or WT release or handover The time and other problems result in packet loss of data, and the data UEs sent by the eNB to the UE may not all be successfully received. Therefore, after the UE receives the data packet sent by the eNB, the eNB acquires the data loss indication parameter of the UE, including the first data loss indication parameter and the second data loss indication parameter, where the first data loss indication parameter is used to indicate the UE itself. The PDCP PDU that has been lost may be confirmed. The second data loss indication parameter is used to indicate the first highest sequence number, and the first highest sequence number is the highest sequence number of the PDCP PDU received by the UE.

It should be noted that, in actual applications, a specific PDU is generally indicated by a sequence number, so the first data loss indication parameter herein may indicate that the UE confirms the serial number of the lost PDCP PDU.

It should be noted that the PDCP PDU that the eNB sends to the UE but is not received by the UE includes:

1. The PDCP PDU that the eNB distributes to the WT but has not been sent by the WT;

2. The eNB distributes to the WT, and the WT has sent the PDCP PDU that the UE has not successfully received;

3. The PDCP PDU that the eNB sends through the LTE link but the UE does not successfully receive.

It should be noted that the first data loss indication parameter and the second data loss indication parameter of the UE that are acquired by the base station may be carried in the PDCP status report, or may be carried in other types of messages, and the specific bearer mode is not limited herein. .

302. The base station determines, according to the first data loss indication parameter and the first highest sequence number, a PDCP PDU that is not received by the UE.

After acquiring the first data loss indication parameter and the second data loss indication parameter of the UE, the base station confirms, according to the UE indicated in the first data loss indication parameter, the received PDCP PDU and the UE indicated by the second data loss indication parameter. The first highest sequence number in the PDCP PDU determines the PDCP PDU that the UE did not receive.

303. The base station sends the PDCP PDU that the UE does not receive to the UE.

After determining the PDCP PDU that the UE does not receive, the eNB retransmits the PDCP PDU that the UE does not receive to the UE, and may retransmit the LTE link, retransmit through the WLAN link, or pass the LTE link and the WLAN link. send together.

In the embodiment of the present invention, the base station acquires the first data loss indication parameter and the second data loss indication parameter of the UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost PDCP PDU, and the second data loss indication parameter And indicating a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE, and the base station determines, according to the first data loss indication parameter and the first highest sequence number, the PDCP PDU that is not received by the UE. The unreceived PDCP PDU is sent to the UE. According to the embodiment of the present invention, the base station can confirm all the PDCP PDUs lost by the UE according to the first data loss indication parameter and the second data loss indication parameter sent by the UE, and retransmit the same to the UE, thereby preventing the LTE-WLAN aggregation process. The data in it is lost.

The data transmission method in the embodiment of the present invention is described below by taking the first data loss indication parameter and the second data loss indication parameter in the PDCP status report frame as an example.

The PDCP status report frame of the prior art includes an indication field of the first data loss indication parameter, and a feasible implementation manner is to expand on the basis of the PDCP status report frame in the prior art, and add a second data loss indication parameter. The indication field.

With reference to FIG. 4, a data transmission method in the embodiment of the present invention includes:

401. When the base station disconnects from the WT, the base station sends a status request message to the UE.

In the process of the eNB transmitting data to the UE through the WLAN link, when the UE moves from the coverage of one WT to the coverage of another WT, the UE disconnects from the AP under the first WT, and then with the second WT. The AP is connected, and when the UE is disconnected from the AP in the first WT, the eNB sends a status request message to the UE to request the UE to send a PDCP status report to the base station, where the report includes a second data loss indication parameter, and the UE is reported to the UE. In the serial number of the currently received PDCP PDU The first highest serial number.

Or, in the process of the eNB transmitting data to the UE through the WLAN link, the eNB releases the currently connected WT, and terminates the sending of the data through the WLAN link. At this time, the UE disconnects from the AP under the currently connected WT. The eNB sends a status request message to the UE to request the UE to send a PDCP status report to the base station, where the report includes a second data loss indication parameter, and reports the first highest sequence number of the PDCP PDU currently received by the UE.

402. The base station receives a PDCP status report sent by the UE.

After receiving the status request message sent by the eNB, the UE sends a PDCP status report to the eNB, where the PDCP status report is an extension based on the existing PDCP status report frame. In the prior art, the PDCP status report frame structure includes only the first data loss indication parameter, so as to feed back the UE to confirm the lost PDCP PDU, and after the extension, add the second data loss indication parameter to the existing PDCP status report frame. The first highest sequence number of the PDCP PDU currently received by the UE is fed back to the eNB.

The manner of extending the frame of the PDCP status report is: adding a field in the existing PDCP status report frame structure, where the field includes a second data loss indication parameter.

Specifically, FIG. 5 is a PDCP status report frame structure when the SN length is 12 bits before expansion, wherein the FMS field includes a first data loss indication parameter.

6 is a PDCP status report frame structure when the SN length is 15 bits before expansion, wherein the FMS field includes a first data loss indication parameter.

The manner of extending the PDCP status report frame structure of FIG. 5 and FIG. 6 is to increase the highest sequence number field (HRS) received by the UE in the PDCP status report frame, and to increase the HRS in order to ensure byte alignment. At the same time, at least one reserved bit R is added.

7 is a frame structure after the PDCP status report frame of the SN length of 12 bits of FIG. 5 is expanded, and FIG. 8 is a frame structure after the PDCP status report frame of the SN length of 15 bits of FIG. 6 is expanded, and the corresponding frame structure is present. The HRS field is added to the frame structure to indicate the first highest sequence number of the PDCP PDU currently received by the UE, and at least one reserved bit R is added.

It should be noted that FIG. 5 to FIG. 8 are examples of the PDCP status report frame format and the added domain in the embodiment of the present invention. In practical applications, the frame structure is not limited to the foregoing, and the added domain is not limited to the HRS. area.

In addition, since the extended domain in the PDCP status report frame is only used in some scenarios, the existing PDCP status report is still applicable to scenarios similar to handover, SeNB release, etc., so the existing PDCP status report and the present invention are required. The extended PDCP status report in the distinction is made. The specific distinguishing manner is: adding a read indication parameter to the PDCP status report frame, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the PDCP status report frame.

In practical applications, the read indication parameters added to the PDCP status report frame structure can be implemented in the following two ways:

1. Carrying the read indication parameter by using a protocol data unit type PDU Type field in an existing PDCP status report frame;

The value of the existing PDU Type field has been defined as shown in Table 1:

Table 1

BitBit	DescriptionDescription
BitBit	DescriptionDescription	000000	PDCP status reportPDCP status report
001001	Interspersed ROHC feedback packetInterspersed ROHC feedback packet	000000	PDCP status reportPDCP status report
001001		010-111010-111	reservedReserved

010-111 is a reserved value, and a value may be selected therein for indicating a read indication parameter, for indicating that the base station reads the second data loss indication parameter from the PDCP status report frame. For example, the selection 010 indicates that the reading indication parameter (the specific value is not limited), and a row needs to be added in Table 1, as shown in Table 2.

Table 2

BitBit	DescriptionDescription
BitBit	DescriptionDescription	000000	PDCP status reportPDCP status report
001001	Interspersed ROHC feedback packetInterspersed ROHC feedback packet	000000	PDCP status reportPDCP status report
001001		010010	Extend PDCP status reportExtend PDCP status report
011-111011-111	reservedReserved	010010	Extend PDCP status reportExtend PDCP status report

2. Carrying the read indication parameter by adding an indication bit in the PDCP status report frame.

The 1 bit reserved bit is used to carry the read indication parameter, and is used to indicate whether the domain containing the second data loss indication parameter is extended in the PDCP status report, and the 12-bit SN is taken as an example. As shown in Figure 9, redefining a reserved bit R in the original frame structure For E, the domain of the second data loss indication parameter is indicated in the frame structure by defining its value. For example, when the value is 1, it indicates that the second data loss indication parameter exists in the frame structure, and the base station is instructed to read the second data loss indication parameter from the PDCP status report frame. There is no domain of the second data loss indication parameter in the frame structure.

It should be noted that, in the embodiment of the present invention, the specific meaning of the value of E is not limited. When E is 0, the field indicating the second data loss indication parameter exists in the frame structure. When E is 1, the frame structure is not There is a field of the second data loss indication parameter.

Specifically, for example, in a scenario where the WT, or the AP group is released and switched, the UE carries the HRS domain in the PDCP status report, and writes E as 1. After receiving the status report, the eNB reads the value of E and finds that If 1, it is known that there is an HRS domain. In other scenarios, such as handover, SeNB release, and the like, the UE does not carry the HRS domain in the PDCP status report, and then sets E to 0. After receiving the status report, the eNB reads the value of E and finds that it is 0, and then it does not exist. HRS domain.

403. The base station determines a second highest sequence number.

After receiving the PDCP status report sent by the UE, the base station reads the first data loss indication parameter and the second data loss indication parameter in the PDCP status report frame, and determines that it is sent to the UE through the LTE link and sent to the UE through the WT. The highest serial number in the serial number of the total PDCP PDU, and the highest serial number is referred to as the second highest serial number.

As shown in FIG. 2, the PDCP PDUs sent by the eNB to the UE through the LTE link are 1, 2, 3, and 4, and the PDCP PDUs sent to the UE through the WLAN link are 5, 6, 7, and 8, and the eNB may determine to send. The second highest sequence number in the total PDCP PDU for the UE is 8.

404. The base station compares the second highest sequence number with the first highest sequence number to determine a first PDCP PDU that is not received by the UE.

After determining the second highest sequence number in the total PDCP PDU sent to the UE, the eNB compares the second highest sequence number with the first highest sequence number indicated by the second data loss indication parameter in the PDCP PDU sent by the UE. If the second highest sequence number sent by the eNB to the UE is greater than the first highest sequence number indicated by the second data loss indication parameter, it may be determined that the UE has an unreceived PDCP PDU, specifically, the sequence number of the PDU is greater than the first The PDCP PDU with the highest sequence number is the first PDCP PDU that the UE has not received.

It should be noted that the first PDCP PDU that is not received is sent by the base station to the UE through the WT. PDCP PDU.

For example, if the second highest sequence number sent by the eNB to the UE in FIG. 2 is 8 and the first highest sequence number received by the UE is 7, it can be determined that the PDCP PDU with sequence number 8 is not received by the UE. A PDCP PDU.

405. The base station determines, according to the first data loss indication parameter, a second PDCP PDU that is not received by the UE.

After the eNB reads the first data loss indication parameter from the received PDCP status report, the first data loss indication parameter may be used to determine the second PDCP PDU that the UE does not receive, that is, the UE feedback PDCP status report in the prior art, and the report Contains the serial number of the lost PDCP PDU that the UE can confirm.

For example, if the PDCP PDU received by the UE in FIG. 2 is a PDU with

sequence numbers

1, 2, 3, 4, 5, 7, the UE itself can confirm that the second PDCP PDU with sequence number 6 is lost.

406. The base station sends, to the UE, a PDCP PDU that is not received by the UE.

The first PDCP PDU and the second PDCP PDU that are not received by the eNB are all PDCP PDUs that are not received by the UE, and the base station retransmits the first PDCP PDU and the second PDCP PDU that are not received by the UE to the UE. Specifically, it may be retransmitted through the LTE link, retransmitted through the WLAN link, or sent through the LTE link and the WLAN link.

For example, the eNB in FIG. 2 determines that the sequence number of the first PDCP that is not received by the UE is 8, and the sequence number of the second PDCP PDU that is not received is 6, and the eNB retransmits the PDUs with sequence numbers 6 and 8 to UE.

It should be noted that the eNB may send the first PDCP PDU and the second PDCP PDU that are not received by the UE to the LTE, or may be separately sent to the UE, which is not limited herein.

In the embodiment of the present invention, based on the PDCP status report frame of the prior art, the indication field of the second data loss indication parameter is added, and the base station reads the read indication parameter of the domain, so that the first data acquired by the eNB is lost. Both the indication parameter and the second data loss indication parameter are carried in the same PDCP status report frame, which saves signaling overhead and improves the achievability of the solution.

Further, as an alternative implementation manner, in an actual application, the existing PDCP status report frame may not be extended, but the second data loss indication parameter is separately fed back by another PDCP status report frame, specifically :

The PDCP status report frame of the prior art is a first PDCP status report frame, and the first data loss indication parameter is located in the first PDCP status report frame, to feed back to the eNB, the UE confirms the lost PDCP PDU, and the frame structure of the status report frame may be As shown in FIG. 5 and FIG. 6 , the FMS domain includes a first data loss indication parameter.

The second data loss indication parameter is located in the second PDCP status report frame, where the status report frame includes a field, where the field includes a second data loss indication parameter, to feed back, to the eNB, the first highest of the PDCP PDU currently received by the UE. serial number.

In a specific application, the domain may be an HRS domain, and if it is an HRS domain, FIG. 10 and FIG. 11 are respectively a second PDCP state report frame structure with an SN length of 12 bits and a PDCP state report frame extension with a SN length of 15 bits. Frame structure.

It should be noted that FIG. 10 and FIG. 11 are examples of the second PDCP status report frame format including the second data loss indication parameter in the embodiment of the present invention. In practical applications, the frame structure is not limited.

Further, optionally, in a specific implementation manner, after the eNB sends the status report request message to the UE, the UE feeds back the second data loss indication parameter PDCP status report frame. In addition, the UE may also feed back the eNB with the second data loss indication parameter PDCP status report frame in one of two ways:

1. The base station receives the second data loss indication parameter that is actively sent by the UE.

The eNB may not request the UE to send the PDCP status report, but the UE may report the PDCP status report including the second data loss indication parameter to the eNB after detecting the event that the second data loss indication parameter is reported. The event that specifically triggers the UE to report the second data loss indication parameter to the eNB may be: the UE detects the channel quality deterioration between all APs in the AP group configured by the eNB, and the specific performance is that all APs in the AP group The measured value meets the preset condition, or other threshold events, which are not limited here.

2. The base station receives the second data loss indication parameter periodically reported by the UE.

When the WT or AP group is released or switched, the eNB may not request the UE to send a PDCP status report, but periodically report a PDCP status report including the second data loss indication parameter.

The specific periodic reporting manner may be: based on the PDCP status periodically reported in the prior art. The report is reported, or an independent PDCP status report frame is used for periodic reporting.

The above is a description of the data transmission method in the embodiment of the present invention from the base station side. The data transmission method in the embodiment of the present invention is introduced from the UE side.

With reference to Figure 12, a data transmission method in an embodiment of the present invention includes:

1201: The UE sends a first data loss indication parameter and a second data loss indication parameter to the base station.

The base station eNB transmits data to the UE through the LTE link and the WLAN link, and the UE receives data transmitted by the eNB through the LTE link and the WLAN link, in the process, due to wireless signal attenuation, signal interference, bandwidth bottleneck or WT release or handover The time and other problems result in packet loss of data, and the data UEs sent by the eNB to the UE may not all be successfully received. Therefore, after the UE receives the data packet sent by the eNB, the UE sends a data indication that is not received to the eNB, to notify the eNB to retransmit the data that the UE does not receive.

The data indication that the UE does not receive the data to be sent to the eNB includes a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter is used to indicate that the UE itself can confirm the lost PDCP PDU, the UE The first data loss indication parameter fed back to the eNB is the prior art; the second data loss indication parameter is used to indicate the first highest sequence number, and the first highest sequence number is the highest sequence number of the PDCP PDU received by the UE.

The base station determines, according to the first data loss indication parameter and the first highest sequence number indicated in the second data loss indication parameter, the PDCP PDU that is not received by the UE, and sends the unreceived PDCP PDU to the UE.

1202: The UE receives the unreceived PDCP PDU sent by the base station.

After the base station sends the PDCP PDU that is not received by the UE, which is determined by the first data loss indication parameter and the second data loss parameter, to the UE, the UE receives the unreceived PDCP PDU sent by the base station, thereby preventing data loss.

In the embodiment of the present invention, the UE sends a first data loss indication parameter and a second data loss indication parameter to the base station, and the base station determines, according to the first data loss indication parameter and the first highest sequence number indicated by the second data loss indication parameter, that the UE does not receive the UE. The received PDCP PDU is sent to the UE, and the UE can obtain the data lost in the LTE-WLAN aggregation after receiving the data retransmitted by the base station.

Instructing the first data loss indication parameter in the PDCP status report frame of the prior art Domain, in practical applications, a feasible implementation manner is to extend the second data loss indication parameter based on the PDCP status report frame of the prior art, and add an indication field of the second data loss indication parameter.

With reference to Figure 13, a data transmission method in an embodiment of the present invention includes:

1301: The UE receives a status request message sent by the base station.

In the process of the eNB transmitting data to the UE through the WLAN link, when the UE moves from the coverage of one WT to the coverage of another WT, the UE disconnects from the AP under the first WT, and then with the second WT. The AP is connected, and when the UE is disconnected from the AP in the first WT, the eNB sends a status request message to the UE to request the UE to send a PDCP status report to the base station, where the report includes a second data loss indication parameter, and the UE is reported to the UE. The first highest sequence number of the currently received PDCP PDU.

Or, in the process of the eNB transmitting data to the UE through the WLAN link, the eNB releases the currently connected WT, and terminates sending data through the WLAN link. At this time, the UE disconnects from the AP under the currently connected WT, and the eNB disconnects. Sending a status request message to the UE to request the UE to send a PDCP status report to the base station, where the report includes a second data loss indication parameter, and reporting the first highest sequence number of the PDCP PDU currently received by the UE.

After the eNB sends a status request message to the UE, the UE receives a status request message sent by the eNB.

1302. The UE sends a PDCP status report to the base station.

The method for extending the PDCP status report frame in the prior art is to add a field in the existing PDCP status report frame structure, where the field includes a second data loss indication parameter.

In a specific implementation, the PDCP status report frame structure before expansion is consistent with the PDCP status report frame structure shown in FIG. 5 and FIG. 6 in FIG. 4, and the extended PDCP status report frame structure and FIG. 7 and FIG. The PDCP status report frame structure shown in Figure 8 is the same and will not be described here.

The read indication parameters in the specific PDCP status report can be implemented in the following two ways:

Specifically, the read index parameter may be carried by extending the PDU Type in the PDCP status report frame. For the specific extended value of the PDU Type, refer to the descriptions of Table 1 and Table 2 in the embodiment shown in FIG. No longer.

Specifically, the reserved bit R in the PDCP status report frame may be assigned to carry the read indication parameter, and the specific frame structure and assignment are the same as the embodiment shown in FIG. 9 in the embodiment shown in FIG. Do not repeat them.

1303. The UE receives the unreceived PDCP PDU sent by the base station.

After receiving the PDCP status report sent by the UE, the base station reads the first data loss indication parameter and the second data loss indication parameter in the PDCP status report frame, and determines that it is sent to the UE through the LTE link and sent to the UE through the WT. The highest serial number in the total PDCP PDU, which is referred to as the second highest serial number.

It should be noted that the first PDCP PDU that is not received is a PDCP PDU that the base station sends to the UE through the WT.

After the eNB reads the first data loss indication parameter from the received PDCP status report, the first data loss indication parameter may be used to determine the second PDCP PDU that the UE does not receive, that is, the UE feedback PDCP status report in the prior art, and the report Contains the missing PDCP PDU that the UE can confirm.

The UE may receive the lost PDCP PDU retransmitted by the eNB, thereby receiving the lost data.

In the embodiment of the present invention, based on the PDCP status report frame sent by the UE to the eNB, the indication field of the second data loss indication parameter and the base station read the read indication parameter of the domain, so that the eNB obtains The first data loss indication parameter and the second data loss indication parameter are all carried in the same PDCP status report frame, which saves signaling overhead and improves the achievability of the solution.

The PDCP status report frame of the prior art is a first PDCP status report frame, and the first data loss indication parameter is located in the first PDCP status report frame, to feed back to the eNB, the UE confirms the lost PDCP PDU, and the frame structure of the status report frame may be As shown in FIG. 6, FIG. 6 , wherein the FMS domain includes a first data loss indication parameter.

It should be noted that, in FIG. 10 and FIG. 11 , an example of a second PDCP status report frame format including a second data loss indication parameter is used in the embodiment of the present invention. Frame structure.

Further, optionally, in a specific implementation, after the eNB sends the status report request message to the UE, the UE feeds back the second data loss indication parameter PDCP status report frame. In addition, the UE may also feed back the eNB with the second data loss indication parameter PDCP status report frame in one of two ways:

1. The second data loss indication parameter that the UE actively sends to the eNB when the UE meets the preset condition.

The eNB may not request the UE to send the PDCP status report, but the UE may report the PDCP status report including the second data loss indication parameter to the eNB after detecting the event that the second data loss indication parameter is reported. The event that triggers the UE to report the second data loss indication parameter to the eNB may be: the UE detects that the channel quality of all APs in the AP group configured by the eNB is worse, which is specifically measured by all the APs in the AP group. The value meets the preset condition, or the UE meets other threshold events, which is not limited herein.

The second data loss indication parameter that the UE periodically reports to the eNB;

During the LTE-WLAN aggregation process, the UE periodically reports the PDCP status report including the second data loss indication parameter to the eNB.

The specific periodic reporting manner may be: reporting based on the PDCP status report periodically reported in the prior art, or performing periodic reporting by using an independent PDCP status report frame.

The data transmission method is introduced above. The base station in the data transmission method is introduced from the perspective of the function module.

With reference to Figure 14, the base station in the embodiment of the present invention includes:

The acquiring unit 1401 is configured to acquire a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication The parameter is used to indicate a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE;

The processing unit 1402 is configured to determine, according to the first data loss indication parameter and the first highest sequence number, a PDCP PDU that is not received by the UE;

The sending unit 1403 sends a PDCP PDU that is not received by the UE to the UE.

For the process of the interaction between the units of the base station 14 in the embodiment of the present invention, refer to the interaction process in the foregoing embodiment shown in FIG. 3, and details are not described herein again.

In the embodiment of the present invention, the acquiring unit 1401 acquires a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost PDCP PDU, and the second data loss indication parameter is used. Instructing the first highest sequence number of the PDCP PDU received by the UE, the processing unit 1402 determines the PDCP PDU that the UE does not receive according to the first data loss indication parameter and the first highest sequence number, and the sending unit 1403 sends the unreceived PDCP PDU. Give the UE. According to the embodiment of the present invention, the processing unit 1402 can confirm all PDCP PDUs lost by the UE according to the first data loss indication parameter and the second data loss indication parameter sent by the UE, and the sending unit 1403 retransmits the PDCP PDU to the UE, thereby preventing Data loss during LTE-WLAN aggregation.

With reference to FIG. 15, a base station 15 is provided in the embodiment of the present invention, including:

The acquiring unit 1501 is configured to acquire a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication The parameter is used to indicate a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE;

The processing unit 1502 is configured to determine, according to the first data loss indication parameter and the first highest sequence number, a PDCP PDU that is not received by the UE;

The sending unit 1503 sends the PDCP PDU that the UE does not receive to the UE.

The processing unit 1502 is specifically configured to determine a second highest sequence number, where the second highest sequence number is the highest sequence number of the PDCP PDU sent by the base station to the UE, where the PDCP PDU sent to the UE is sent to the UE through the LTE link or the WT. The PDCP PDU, the second highest sequence number is compared with the first highest sequence number to determine the first PDCP PDU that the UE does not receive, and the first PDCP PDU that is not received is the PDCP PDU sent by the base station through the WT; A data loss indication parameter determines a second PDCP PDU that the UE has not received.

The sending unit 1503 is further configured to: when the WT is disconnected, send a status request message to the UE, where the status request message is used to request the UE to send the second data loss indication parameter to the base station, where the acquiring unit 1501 is specifically configured to receive the Two data loss indication parameters.

The first data loss indication parameter and the second data loss indication parameter acquired by the obtaining unit 1501 are located in the same PDCP status report frame;

The first data loss indication parameter and the second data loss indication parameter acquired by the obtaining unit 1501 are located in the same PDCP status report frame, and the PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to indicate the base station from The second data loss indication parameter is read in the PDCP status report frame.

The first data loss indication parameter and the second data loss indication parameter acquired by the obtaining unit 1501 are located in the same PDCP status report frame, and the PDCP status report frame further includes a protocol data unit type PDU Type field or indicator bit, a PDU Type field or an indication. The bit carries the above read indication parameter.

For the process of the interaction between the units of the base station 15 in the embodiment of the present invention, refer to the interaction process in the foregoing embodiment shown in FIG. 4, and details are not described herein again.

Further, as another embodiment, the first data loss indication parameter acquired by the obtaining unit 1501 is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame.

The second PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the second PDCP status report frame.

The second PDCP status report frame further includes a PDU Type field or an indication bit, and the PDU Type field or the indication bit carries a read indication parameter.

Further, as another embodiment, the acquiring unit 1501 is specifically configured to receive a second data loss indication parameter that is sent by the UE, where the second data loss indication parameter is sent when the UE meets the preset condition, or the acquiring unit 1501 is specifically configured to receive The second data loss indication parameter periodically reported by the UE.

The user equipment UE in the data transmission method is introduced from the perspective of the function module.

With reference to Figure 16, the user equipment 16 in the embodiment of the present invention includes:

The sending unit 1601 is configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication The parameter is used to indicate a first highest sequence number, where the first highest sequence number is the highest sequence number of the PDCP PDU received by the UE, the first data loss indication parameter and The first highest sequence number is used to enable the base station to determine a PDCP PDU that is not received by the UE, and send the unreceived PDCP PDU to the UE;

The receiving unit 1602 is configured to receive the unreceived PDCP PDU sent by the base station.

For the process of the interaction between the units of the user equipment 16 in the embodiment of the present invention, refer to the interaction process in the foregoing embodiment shown in FIG. 12, and details are not described herein again.

In the embodiment of the present invention, the sending unit 1601 in the user equipment 16 sends a first data loss indication parameter and a second data loss indication parameter to the base station, where the base station indicates the first data loss indication parameter and the second data loss indication parameter. The highest sequence number determines the PDCP PDU that the UE does not receive, and then sends the unreceived PDCP PDU to the UE. After receiving the data retransmitted by the base station, the receiving unit 1602 of the UE can obtain the data lost in the LTE-WLAN aggregation. .

With reference to Figure 17, the user equipment 17 in the embodiment of the present invention includes:

The sending unit 1701 is configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication The parameter is used to indicate a first highest sequence number, where the first highest sequence number is the highest sequence number of the PDCP PDU received by the UE, and the first data loss indication parameter and the first highest sequence number are used to enable the base station to determine the PDCP PDU that the UE does not receive. And transmitting the unreceived PDCP PDU to the UE;

The receiving unit 1702 is configured to receive the unreceived PDCP PDU sent by the base station.

The sending unit 1701 is specifically configured to: when the receiving unit receives the status request message sent by the base station, send the second data loss indication parameter to the base station.

The first data loss indication parameter and the second data loss indication parameter sent by the sending unit 1701 to the base station are located in the same PDCP status report frame.

When the first data loss indication parameter and the second data loss indication parameter sent by the sending unit 1701 to the base station are located in the same PDCP status report frame, the PDCP status report frame further includes a read indication parameter, and the read indication parameter is used to indicate The base station reads the second data loss indication parameter from the PDCP status report frame.

When the first data loss indication parameter and the second data loss indication parameter sent by the sending unit 1701 to the base station are located in the same PDCP status report frame, the PDCP status report frame further includes a protocol data unit type PDU Type field or an indication bit, and the PDU The Type field or indicator bit carries a read indication parameter.

For the process of the interaction between the units of the user equipment 17 in the embodiment of the present invention, refer to the interaction process in the foregoing embodiment shown in FIG. 13 , and details are not described herein again.

Further, as another embodiment, the user equipment 17 further includes:

The processing unit 1703 is configured to determine whether the preset condition is met;

The sending unit 1701 is specifically configured to: when the processing unit confirms that the preset condition is met, send a second data loss indication parameter to the base station.

Further, as another embodiment, the sending unit 1701 is specifically configured to periodically send a second data loss indication parameter to the base station.

Further, as another embodiment, the first data loss indication parameter sent by the sending unit 1701 to the base station is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame.

Further, as another embodiment, when the first data loss indication parameter sent by the sending unit 1701 to the base station is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame, the second PDCP The status report frame further includes a read indication parameter, and the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the second PDCP status report frame.

Further, as another embodiment, when the first data loss indication parameter sent by the sending unit 1701 to the base station is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame, the second PDCP The status report frame further includes a PDU Type field or an indication bit, and the PDU Type field or the indication bit carries a read indication parameter.

The foregoing is a description of the base station and the user equipment in the embodiment of the present invention from the perspective of the function module. The base station and the user equipment in the embodiment of the present invention are described below from the perspective of hardware processing.

With reference to FIG. 18, an embodiment of the present invention provides a base station 18, which may include at least one network interface or other communication interface, at least one receiver 1801, at least one transmitter 1802, at least one processor 1803, and a memory 1804. To achieve connection communication between these devices, The communication connection between the system gateway and at least one other network element is implemented by at least one network interface (which may be wired or wireless).

The memory 1804 can include read-only memory and random access memory, and provides instructions and data to the processor 1803. A portion of the memory 1804 can also include, possibly including, a high-speed random access memory (RAM), and possibly a non- Un-volatile memory.

Memory 1804 stores the following elements, executable modules or data structures, or subsets thereof, or their extended sets:

Operation instructions: include various operation instructions for implementing various operations.

Operating system: Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.

In the embodiment of the present invention, the processor 1803 performs the following operations by calling an operation instruction stored in the memory 1804 (which can be stored in the operating system):

Obtaining a first data loss indication parameter and a second data loss indication parameter of the user equipment UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication parameter is used to indicate a first highest sequence number, where the first highest sequence number is the highest sequence number of the PDCP PDU received by the UE, and the PDCP PDU that the UE does not receive is determined according to the first data loss indication parameter and the first highest sequence number;

The PDCP PDU not received by the UE is transmitted by the transmitter 1802 to the UE.

In some embodiments, the processor 1803 described above may also perform the following steps:

Determining a second highest sequence number, where the second highest sequence number is the highest sequence number of the PDCP PDU sent by the base station to the UE, where the PDCP PDU sent to the UE is sent to the LTE link through the Long Term Evolution (LTE) link or the WLAN endpoint The PDCP PDU of the UE compares the second highest sequence number with the first highest sequence number to determine the first PDCP PDU that the UE does not receive, and the first PDCP PDU that is not received is the PDCP PDU that the base station sends through the WT; Determining, by the first data loss indication parameter, a second PDCP PDU that is not received by the UE.

When disconnected from the WT, the status request message is sent to the UE by the transmitter 1802, and the status request message is used to request the UE to send the second data loss indication parameter to the base station, by using the receiver 1801. Receiving a second data loss indication parameter sent by the UE.

Receiving, by the receiver 1801, a second data loss indication parameter sent by the UE, where the second data loss indication parameter is sent when the UE meets the preset condition.

The second data loss indication parameter periodically reported by the UE is received by the receiver 1801.

In some embodiments, the first data loss indication parameter and the second data loss indication parameter acquired by the processor 1803 are located in the same PDCP status report frame;

Or, the first data loss indication parameter is located in the first PDCP status report frame, and the second data loss indication parameter is located in the second PDCP status report frame.

In some embodiments, if the first data loss indication parameter and the second data loss indication parameter acquired by the processor 1803 are located in the same PDCP status report frame, the PDCP status report frame further includes a read indication parameter, and is read. The indication parameter is used to indicate that the base station reads the second data loss indication parameter from the PDCP status report frame; if the first data loss indication parameter is located in the first PDCP status report frame, the second data loss indication parameter is located in the second PDCP status report frame. The second PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the second PDCP status report frame.

In some embodiments, if the first data loss indication parameter and the second data loss indication parameter acquired by the processor 1803 are located in the same PDCP status report frame, the PDCP status report frame further includes a protocol data unit type PDU Type field. Or the indicator bit, the PDU Type field or the indicator bit carries the read indication parameter; if the first data loss indication parameter is located in the first PDCP status report frame, the second data loss indication parameter is located in the second PDCP status report frame, the second data The loss indication parameter is located in the second PDCP status report frame, and the second PDCP status report frame further includes a PDU Type field or an indication bit, and the PDU Type field or the indication bit carries a read indication parameter.

According to the embodiment of the present invention, the processor 1803 can confirm all PDCP PDUs lost by the UE according to the first data loss indication parameter and the second data loss indication parameter sent by the UE, and the transmitter 1802 retransmits the PDCP PDU to the UE, thereby preventing Data loss during LTE-WLAN aggregation.

With reference to FIG. 19, an embodiment of the present invention provides a base station 19, which may include at least one network interface or other communication interface, at least one receiver 1901, and at least one transmitter. 1902, at least one processor 1903 and a memory 1904 for enabling connection communication between the devices, the communication connection between the system gateway and the at least one other network element being implemented by at least one network interface (which may be wired or wireless).

The memory 1904 can include read only memory and random access memory, and provides instructions and data to the processor 1903. A portion of the memory 1904 can also include, possibly including, a high speed random access memory (RAM), and possibly a non- Un-volatile memory.

Memory 1904 stores the following elements, executable modules or data structures, or subsets thereof, or their extended sets:

In the embodiment of the present invention, the processor 1903 performs the following operations by calling an operation instruction stored in the memory 1904 (which can be stored in the operating system):

Transmitting, by the calling transmitter 1902, a first data loss indication parameter and a second data loss indication parameter to the base station, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, and the second data loss indication parameter And indicating a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE, where the first data loss indication parameter and the first highest sequence number are used to enable the base station to determine the PDCP PDU that the UE does not receive. And sending the unreceived PDCP PDU to the UE;

The unreceived PDCP PDU transmitted by the base station is received by the receiver 1901.

In some embodiments, the above transmitter 1902 can also perform the following steps:

When the receiver 1901 receives the status request message sent by the base station, the second data loss indication parameter is sent to the base station.

In some embodiments, the processor 1903 described above may also perform the following steps:

It is judged whether the preset condition is satisfied, and when the preset condition is satisfied, the calling transmitter 1902 transmits a second data loss indication parameter to the base station.

The second data loss indication parameter is periodically sent to the base station.

In some embodiments, the first data loss indication parameter and the second data loss indication parameter sent by the transmitter 1902 to the base station are located in the same PDCP status report frame; or the first data loss indication parameter is located in the first PDCP status report. In the frame, the second data loss indication parameter is located in the second PDCP status report frame.

In some embodiments, if the first data loss indication parameter and the second data loss indication parameter sent by the transmitter 1902 to the base station are located in the same PDCP status report frame, the PDCP status report frame further includes a read indication parameter. The read indication parameter is used to indicate that the base station reads the second data loss indication parameter from the PDCP status report frame; if the first data loss indication parameter sent by the transmitter 1902 to the base station is located in the first PDCP status report frame, the second data is The second indication parameter is further included in the second PDCP status report frame, and the read indication parameter is used to indicate that the base station reads the second data loss indication from the second PDCP status report frame. parameter.

In some embodiments, if the first data loss indication parameter and the second data loss indication parameter sent by the transmitter 1902 to the base station are located in the same PDCP status report frame, the PDCP status report frame further includes a protocol data unit type PDU. The PDU Type field or the indicator bit carries the read indication parameter; if the first data loss indication parameter sent by the transmitter 1902 to the base station is located in the first PDCP status report frame, the second data loss indication parameter is located in the first In the second PDCP status report frame, the second PDCP status report frame further includes a PDU Type field or an indication bit, and the PDU Type field or the indication bit carries a read indication parameter.

In the embodiment of the present invention, the transmitter 1902 sends a first data loss indication parameter and a second data loss indication parameter to the base station, where the base station determines the UE according to the first data loss indication parameter and the first highest sequence number indicated by the second data loss indication parameter. The unreceived PDCP PDU is sent to the UE, and the transmitter 1902 receives the data retransmitted by the base station, thereby preventing data loss in the LTE-WLAN aggregation.

The terms "first", "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a particular order or order. It is to be understood that the data so used may be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than what is illustrated or described herein. In addition, the terms "include" and "have" and any of them Variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that comprises a series of steps or modules is not necessarily limited to those steps or modules that are clearly listed, but may include not explicitly listed Or for other steps or modules inherent in these processes, methods, products or devices, the division of modules appearing in this document is only a logical division, and there may be another division in the implementation of the actual application, for example, Modules may be combined or integrated into another system, or some features may be omitted or not performed. Additionally, the coupling or direct coupling or communication connection between the displayed or discussed interactions may be through some interfaces, modules The indirect coupling or communication connection between the two may be electrical or the like, and is not limited herein. Moreover, the module or the sub-module described as the separate component may or may not be physically separated, may not be a physical module, or may not be divided into a plurality of circuit modules, and may select a part thereof according to actual needs or All modules are used to achieve the objectives of the embodiments of the present invention.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

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 purpose of the solution of the embodiment.

In addition, each functional unit in various embodiments of the present invention may be integrated in one processing unit. It is also possible that each unit physically exists alone, or two or more units may be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional 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, which is essential or contributes 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. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) 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 U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The data transmission method, the base station, and the user equipment provided by the present invention are described in detail. The principles and implementation manners of the present invention are described in the specific examples. The description of the above embodiments is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for the person of ordinary skill in the art, according to the idea of the present invention, there are some changes in the specific embodiment and the scope of application. In summary, the content of the specification should not be understood. To limit the invention.

Claims

A data transmission method, comprising:

The base station acquires a first data loss indication parameter and a second data loss indication parameter of the user equipment UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, the second The data loss indication parameter is used to indicate a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE;

Determining, by the base station, a PDCP PDU that is not received by the UE according to the first data loss indication parameter and the first highest sequence number;

The base station sends a PDCP PDU that is not received by the UE to the UE.
The method according to claim 1, wherein the determining, by the base station, the PDCP PDU that is not received by the UE according to the first data loss indication parameter and the first highest sequence number comprises:

Determining, by the base station, a second highest sequence number, where the second highest sequence number is a highest sequence number of the PDCP PDU sent by the base station to the UE, where the PDCP PDU sent to the UE is a long-term evolution LTE chain a PDCP PDU sent by the road or wireless local area network endpoint WT to the UE;

The base station compares the second highest sequence number with the first highest sequence number to determine a first PDCP PDU that is not received by the UE, and the unreceived first PDCP PDU is the base station a PDCP PDU sent by the WT;

The base station determines, according to the first data loss indication parameter, a second PDCP PDU that is not received by the UE.
The method according to claim 2, wherein the acquiring, by the base station, the second data loss indication parameter of the UE comprises:

When the base station is disconnected from the WT, the base station sends a status request message to the UE, where the status request message is used to request the UE to send the second data loss indication parameter to the base station, Receiving, by the base station, the second data loss indication parameter sent by the UE;

Or the base station receives the second data loss indication parameter sent by the UE, where the second data loss indication parameter is sent when the UE meets a preset condition;

Or the base station receives the second data loss indication parameter periodically reported by the UE.
The method according to any one of claims 1 to 3, characterized in that:

The first data loss indication parameter and the second data loss indication parameter are located in the same PDCP status report frame.
The method of claim 4 wherein:

The PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the PDCP status report frame.
The method according to any one of claims 1 to 3, characterized in that:

The first data loss indication parameter is located in a first PDCP status report frame, and the second data loss indication parameter is located in a second PDCP status report frame.
The method of claim 6 wherein:

The second PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the second PDCP status report frame.
A data transmission method, comprising:

The user equipment UE sends a first data loss indication parameter and a second data loss indication parameter to the base station, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, the second The data loss indication parameter is used to indicate a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE, and the first data loss indication parameter and the first highest sequence number are used. The base station is configured to determine a PDCP PDU that is not received by the UE, and send the unreceived PDCP PDU to the UE;

The UE receives the unreceived PDCP PDU sent by the base station.
The method according to claim 8, wherein the sending, by the UE, the second data loss indication parameter to the base station comprises:

When the UE receives the status request message sent by the base station, the UE sends the second data loss indication parameter to the base station;

Or, when the UE meets a preset condition, the UE sends the second data loss indication parameter to the base station;

Or the UE periodically reports the second data loss indication parameter to the base station.
A method according to claim 8 or claim 9 wherein:

The first data loss indication parameter and the second data loss indication parameter are located in the same one The PDCP status report is in the frame.
The method of claim 10 wherein:

The PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the PDCP status report frame.
A method according to claim 8 or claim 9 wherein:

The first data loss indication parameter is located in a first PDCP status report frame, and the second data loss indication parameter is located in a second PDCP status report frame.
The method of claim 12 wherein:

The second PDCP status report frame further includes the read indication parameter, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the second PDCP status report frame. .
A base station, comprising:

An acquiring unit, configured to acquire a first data loss indication parameter and a second data loss indication parameter of the user equipment UE, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, The second data loss indication parameter is used to indicate a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE;

a processing unit, configured to determine, according to the first data loss indication parameter and the first highest sequence number, a PDCP PDU that is not received by the UE;

And sending, by the UE, the PDCP PDU that is not received by the UE to the UE.
The base station according to claim 14, wherein:

The processing unit is specifically configured to determine a second highest sequence number, where the second highest sequence number is a highest sequence number of the PDCP PDU sent by the base station to the UE, where the PDCP PDU sent to the UE is The PDCP PDU sent by the LTE-LTE link or the WLAN endpoint WT to the UE, and the second highest sequence number is compared with the first highest sequence number to determine the first PDCP that the UE does not receive. a PDU, the unreceived first PDCP PDU is a PDCP PDU sent by the base station by using the WT, and determining, according to the first data loss indication parameter, a second PDCP PDU that is not received by the UE.
The base station according to claim 15, wherein:

The sending unit is further configured to send a status request to the UE when disconnected from the WT a message, the status request message is used to request the UE to send the second data loss indication parameter to the base station;

The acquiring unit is specifically configured to receive the second data loss indication parameter sent by the UE.
A base station according to any one of claims 14 to 16, characterized in that:

The acquiring unit is specifically configured to acquire a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter and the second data loss indication parameter are in the same PDCP status report. In the frame.
The base station according to claim 17, wherein:

The acquiring unit is specifically configured to acquire a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter and the second data loss indication parameter are in the same PDCP status report. In the frame, the PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to instruct the base station to read the second data loss indication parameter from the PDCP status report frame.
A base station according to any one of claims 14 to 16, characterized in that:

The acquiring unit is specifically configured to acquire a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter is located in a first PDCP status report frame, and the second data is lost. The indication parameter is located in the second PDCP status report frame.
The base station according to claim 19, characterized in that:

The acquiring unit is specifically configured to acquire a first data loss indication parameter and a second data loss indication parameter of the UE, where the first data loss indication parameter is located in a first PDCP status report frame, and the second data is lost. The indication parameter is located in the second PDCP status report frame, and the second PDCP status report frame further includes a read indication parameter, where the read indication parameter is used to indicate that the base station reads from the second PDCP status report frame Taking the second data loss indication parameter.
A user equipment, comprising:

a sending unit, configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter is used to indicate that the UE confirms the lost packet data convergence protocol data unit PDCP PDU, The second data loss indication parameter is used to indicate a first highest sequence number, where the first highest sequence number is a highest sequence number of the PDCP PDU received by the UE, the first data loss indication parameter and the first highest sequence The number is used to enable the base station to determine that the UE is not connected Receiving the PDCP PDU, and transmitting the unreceived PDCP PDU to the UE;

And a receiving unit, configured to receive the unreceived PDCP PDU sent by the base station.
The user equipment according to claim 21, wherein:

The sending unit is specifically configured to: when the receiving unit receives the status request message sent by the base station, send the second data loss indication parameter to the base station.
User equipment according to claim 21 or 22, characterized in that:

The sending unit is configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter and the second data loss indication parameter are located in a same PDCP status report frame. .
The user equipment according to claim 23, characterized in that:

The sending unit is configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter and the second data loss indication parameter are located in a same PDCP status report frame. And the reading indication parameter is used to indicate that the base station reads the second data loss indication parameter from the PDCP status report frame.
User equipment according to claim 21 or 22, characterized in that:

The sending unit is configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter is located in a first PDCP status report frame, and the second data loss indication parameter is Located in the second PDCP status report frame.
The user equipment of claim 25, wherein:

The sending unit is configured to send, to the base station, a first data loss indication parameter and a second data loss indication parameter, where the first data loss indication parameter is located in a first PDCP status report frame, and the second data loss indication parameter is The second PDCP status report frame is further included in the second PDCP status report frame, where the read indication parameter is used to indicate that the base station reads from the second PDCP status report frame. Taking the second data loss indication parameter.