WO2014194841A1 - Data transmission method and device - Google Patents

Abstract

Disclosed are a data transmission method and device for data transmission between a user equipment, a macro base station, and a small base station, comprising: a macro base station determines a downlink retransmission station, the downlink retransmission station being a station for transmitting to a user equipment data that have not been successfully transmitted to the user equipment by the macro base station and a small base station; the macro base station transmits downlink data to be retransmitted, determined according to a downlink status report, to the user equipment via the downlink retransmission station, the downlink status report indicating the data reception status of the user equipment from the macro station and the small station. In the present invention, the macro station integrately controls the downlink retransmission task distribution during inter-station carrier aggregation, thereby effectively avoiding lowering data transmission efficiency caused by two stations having different transmission conditions.

Description

 The present application claims priority to Chinese Patent Application No. 201310222262.8, entitled "Data Transmission Method and Apparatus", filed on June 5, 2013, the entire contents of which are incorporated by reference. In this application. Technical field

 The present invention relates to a mobile communication system, and more particularly to a data transmission method and apparatus capable of implementing carrier aggregation. Background technique

 In order to further improve the spectrum efficiency and user throughput of the mobile communication system, the concept of Carrier Aggregation (CA) is introduced in LTE-A (Long Term Evolution - Advanced). The so-called carrier aggregation means that the UE (User Equipment) can simultaneously use the component carrier (CC) of the macro base station (Macro eNB, MeNB) and/or the small base station (Small eNB, SeNB) for uplink and downlink. Communication to support high speed data transmission. Generally, as shown in Figure 1, the cell coverage of the macro base station is relatively large, and the cell coverage of the small base station is relatively small. According to the base station corresponding to the component carrier, the carrier aggregation of the LTE system can be roughly divided into intra-base station aggregation and inter-base station aggregation, and the inter-base station aggregation can be further divided into macro base station aggregation and macro base station and small base station aggregation (hereinafter referred to as Macro small base station aggregation). Among them, the aggregation in the base station is relatively simple to implement because it is controlled by only one base station, and related technical documents exist. However, there is no technical literature on inter-base station aggregation, especially for macro-small base station aggregation. How to divert data is an urgent problem to be studied.

For example, from the perspective of the protocol stack, it may be based on a PDCP (Packet Data Convergence Protocol) SDU (service data unit), a PDCP PDU (packet data unit), RLC (Radio Link Control) SDU, RLC PDU, MAC (Medium Access Control) SDU or MAC PDU, etc., for data distribution. Among them, splitting based on RLC PDUs may be relatively easy to implement. As shown in FIG. 2a, the RLC PDU offloading includes: For downlink, the macro base station forwards part of the RLC PDU to the small base station after the RLC layer processes the data, or after the RLC layer allocates the RLC PDU sequence number and hands over to the next layer. And then sending the RLC PDU to the user equipment through the small base station; for the uplink, the user equipment sends part of the RLC PDU to the small base station and sends the remaining part of the RLC PDU to the macro base station, and then the small base station forwards the RLC PDU received from the user equipment to After the macro base stations are merged, they are submitted to the upper layer for processing. For data offloading based on other packet forms, the process is similar to the above, except that the packet format is different.

 However, when the data is offloaded as above, since the channel environment and/or the transmission rate on both sides of the macro base station and the small base station are basically different, and the forwarding through the small base station requires a certain communication time, this makes: For the downlink, the user equipment targets the macro base station. The detected lost packet may be a data packet that the macro base station forwards to the small base station and the small base station has not sent to the user equipment; and for the uplink, the lost packet detected by the macro base station for the user equipment may be forwarded by the user equipment to the small base station. And the small base station has not sent the data packet to the macro base station. This obviously affects the data transmission efficiency of the entire system, especially in the case of RLC entities transmitting data in UM or AM mode.

In other words, in the UM mode, the UM RLC receiving entity performs functions such as maintaining, updating, repeatedly detecting, and reordering related windows based on the UMD PDU sequence number. As shown in Figure 2b, the upper boundary of the reordering window is incremented by 1 for the sequence number of the currently received UMD PDU and is represented by VR(H). The lower bound of the reordering window is obtained by subtracting the size of the reordering window from the upper bound, and there is no special token. Instead of starting a reordering timer for each packet, the entire UM RLC receiving entity maintains only one reordering timer. When the reordering timer is updated, the new upper boundary of the reordering timer control is the maximum sequence number of the currently received UMD PDU, and the lower boundary is before The serial number of the first UMD PDU that was not correctly received in the lower bound.

 If the data split transmission between the macro and small base stations is performed directly according to the above existing UM mode, the user equipment may be in the reordering timer due to different channel conditions and/or transmission rates on both sides of the macro base station and the small base station. The lost packet detected within the macro base station or the small base station is not yet sent out at all, resulting in a high packet loss rate.

 In addition, in the AM mode, as shown in FIG. 2c, the lower boundary of the receiving window is the value of the next sequence number immediately following the sequence number of the AMD PDU with the highest sequence number among the consecutive consecutive AMD PDUs received, and uses VR. (R) indicates. The upper bound of the receive window is the lower bound plus the window size. If the newly received AMD PDU is outside the receiving window or the PDU segment has been received, it is discarded, otherwise it is put into the buffer processing. The AM RLC receiving entity performs a reordering operation based on the reordering timer, and uses a certain variable to represent the upper and lower boundaries corresponding to each reordering timer start, and uniformly treats the gaps within the range of the serial number. The PDU at all gaps in the sequence number is received before the timer expires, then the timer is stopped. If there is a gap after the timer expires, restart the reordering timer for the following gap, and record the upper and lower boundaries of the corresponding reordering wait, ie update VR(MS) and VR(X)

 If data split transmission between macro and small base stations is directly performed according to the above existing AM mode, the low rate side may cause the entire reordering timer due to different channel conditions and/or transmission rates on both sides of the macro base station and the small base station. The upper and lower boundaries are updated slowly and the window of the receiving window appears, so that the higher rate party cannot be sent at a higher rate, and the data transmission efficiency cannot be improved. Summary of the invention

 technical problem

In view of this, the technical problem to be solved by the present invention is to provide a data transmission. The method is such that carrier aggregation, especially macro-base station carrier aggregation, can not affect the improvement of data transmission efficiency.

 solution

 In order to solve the above technical problem, according to an aspect of the present invention, a data transmission method is provided. In a case where the first base station and the second base station perform data transmission with the user equipment, the method includes: determining, by the first base station, a downlink weight a downlink station, where the downlink retransmission station is used by the first base station and the second base station to transmit the first base station to the user equipment, and the second base station is not successfully sent to the user equipment And the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment via the downlink retransmission station, where the downlink status report indicates that the user equipment A state in which the first base station and the second base station receive data.

 For a data transmission method, in a possible implementation manner, the downlink status report includes a first downlink status report and a second downlink status report, where: the first downlink status report indicates that the user equipment is a state in which the first base station receives data, and the second downlink state report indicates a state in which the user equipment receives data from the second base station.

For a data transmission method, in a possible implementation manner, before the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment by using the downlink retransmission station, The first base station sends a downlink retransmission indication to the second base station, where the downlink retransmission indication includes information of the downlink retransmission station, and the information of the downlink retransmission station includes at least one of the following information: And indicating that the information about the downlink retransmission station is controlled by the first base station, the identifier information of the downlink retransmission station, and the identifier information of the cell of the downlink retransmission station, indicating whether the second base station is determined as Information of the downlink retransmission station, and information indicating whether the first base station is determined as the downlink retransmission station. For a data transmission method, in a possible implementation manner, the sending, by the first base station, the downlink to-be-retransmitted data determined by the downlink status report to the user equipment by using the downlink retransmission station includes: If the retransmission site does not include the second base station, the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment.

 For a data transmission method, in a possible implementation manner, the sending, by the first base station, the downlink to-be-retransmitted data determined by the downlink status report to the user equipment by using the downlink retransmission station includes: If the retransmission station includes the second base station, the first base station sends part or all of the downlink to-be-retransmitted data determined according to the downlink status report to the second base station, so that the second The base station can send part or all of the downlink to-be-retransmitted data to the user equipment.

 For a data transmission method, in a possible implementation manner, the sending, by the first base station, the downlink to-be-retransmitted data determined by the downlink status report to the user equipment by using the downlink retransmission station includes: If the retransmission station includes the second base station, the first base station sends the second downlink status report and/or the downlink to-be-retransmitted data determined according to the first downlink status report to the first a second base station, configured to enable the second base station to send downlink to-be-retransmitted data determined according to the second downlink state report and/or downlink to-be-retransmitted data determined according to the first downlink state report to the User equipment.

 For a data transmission method, in a possible implementation manner, before the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment by using the downlink retransmission station, the method further includes: The first base station sends the downlink retransmission indication to the user equipment.

For a data transmission method, in a possible implementation manner, before the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment by using the downlink retransmission station, the method further includes: The first base station from the The second base station receives the downlink status report; or the first base station sends the downlink status report to the second base station.

 For a data transmission method, in a possible implementation manner, the method further includes: the first base station determining an uplink retransmission station, where the uplink retransmission station is used in the first base station and the second base station Receiving, from the user equipment, a station that the user equipment does not successfully send data to the first base station and/or the second base station; and the first base station sends an uplink retransmission indication to the user equipment, where The uplink retransmission indication includes information of the uplink retransmission station.

 For a data transmission method, in a possible implementation manner, the method further includes: sending, by the first base station, the uplink retransmission indication to the second base station.

 In order to solve the above technical problem, according to another aspect of the present invention, a data transmission method is provided. When the first base station and the second base station perform data transmission with the user equipment, the method includes: The report determines the uplink data to be retransmitted, where the uplink status report indicates a state in which the first base station and the second base station receive data from the user equipment; and the user equipment sends the uplink data to be retransmitted Sending to an uplink retransmission station, where the uplink retransmission station is a preset station in the first base station and the second base station, or is specified in an uplink retransmission indication received from the first base station The station, or the uplink granting station is currently allocated to the user equipment in the first base station and the second base station.

 For a data transmission method, in a possible implementation manner, the uplink status report includes a first uplink status report and a second uplink status, where: the first uplink status report indicates that the first base station is from the a state in which the user equipment receives data; and the second uplink status report indicates a status in which the second base station receives data from the user equipment.

In order to solve the above technical problem, according to still another aspect of the present invention, a data transmission method is provided, in which data is performed between a first base station and a second base station and a user equipment. In the case of the transmission, the user equipment receives the downlink retransmission indication from the first base station, where the downlink retransmission indication includes information of a downlink retransmission station, and the downlink retransmission station is the first a station in the base station and the second base station for transmitting data of the first base station and the second base station that is not successfully sent to the user equipment to the user equipment; and the user equipment according to the downlink weight And transmitting, by the downlink retransmission station, downlink retransmission data, where the downlink retransmission data is that the first base station and the second base station that are transmitted by the downlink retransmission station to the user equipment are unsuccessful Data sent to the user device.

 For the data transmission method, in a possible implementation manner, before the user equipment receives the downlink retransmission data from the downlink retransmission station according to the downlink retransmission indication, the method further includes: the user equipment according to the The downlink retransmission indication sends a downlink status report to the first base station, where the downlink status report indicates a status of the user equipment receiving data from the first base station and the second base station.

 For a data transmission method, in a possible implementation manner, the downlink status report includes a first downlink status report and a second downlink status report, where: the first downlink status report indicates that the user equipment is a state in which the first base station receives data, and the second downlink state report indicates a state in which the user equipment receives data from the second base station.

 For the data transmission method, in a possible implementation manner, before the user equipment receives the downlink retransmission data from the downlink retransmission station according to the downlink retransmission indication, the method further includes: at the downlink retransmission site In the case of the second base station, for a data transmission method, in a possible implementation manner, the first base station is a macro base station, the second base station is a small base station, and a cell coverage ratio of the macro base station is The cell coverage of the small base station is large.

For a data transmission method, in a possible implementation manner, the status report is an RLC status report, and the downlink to be retransmitted data and the uplink to be retransmitted The data is segmented by RLC PDUs and/or PDUs to be retransmitted.

 In order to solve the above technical problem, according to still another aspect of the present invention, a base station device is provided, including: a downlink retransmission station determining module, configured to use, at the base station device, a first base station and a second base station, and a user equipment Determining, by the downlink retransmission station, the downlink retransmission station, where the downlink retransmission station is used by the first base station and the second base station to transmit the first base station to the user equipment, and the a second base station that is not successfully sent to the data of the user equipment; and a downlink retransmission module, connected to the downlink retransmission station determining module, configured to enable downlink downlink data to be retransmitted according to the downlink status report to be sent through the downlink The retransmission station sends the data to the user equipment, where the downlink status report indicates a status of the user equipment receiving data from the first base station and the second base station.

 For the foregoing base station device, in a possible implementation, the downlink status report includes a first downlink status report and a second downlink status report, where: the first downlink status report indicates that the user equipment is a state in which the first base station receives data, and the second downlink state report indicates a state in which the user equipment receives data from the second base station.

 For the foregoing base station device, in a possible implementation, the method further includes: a downlink retransmission indication module that is connected to the downlink retransmission site determining module, where the downlink retransmission indication module is configured to send a downlink to the second base station a retransmission indication, where the downlink retransmission indication includes information of the downlink retransmission station, and the information of the downlink retransmission station includes at least one of the following information: indicating that the downlink is controlled by the first base station The information of the retransmission station, the identifier information of the downlink retransmission station, and the identifier information of the cell of the downlink retransmission station, indicating whether the second base station is determined as the information of the downlink retransmission station, and the indication Whether the first base station is determined as the information of the downlink retransmission station.

For the foregoing base station device, in a possible implementation manner, the downlink retransmission module is configured to: not include the second base station in the downlink retransmission station The downlink to-be-retransmitted data determined according to the downlink status report is sent to the user equipment.

 For the above-mentioned base station device, in a possible implementation manner, the downlink retransmission module is configured to: when the downlink retransmission station includes the second base station, determine according to the downlink status report Part or all of the downlink retransmitted data is sent to the second base station, so that the second base station can send part or all of the downlink to-be-retransmitted data to the user equipment.

 For the foregoing base station device, in a possible implementation, the downlink retransmission module is configured to: when the downlink retransmission station includes the second base station, report the second downlink status and And transmitting the downlink to-be-retransmitted data determined according to the first downlink state report to the second base station, so that the second base station can perform the downlink to-be-retransmitted data determined according to the second downlink state report. And/or the downlink to-be-retransmitted data determined according to the first downlink status report is sent to the user equipment.

 For the above-mentioned base station device, in a possible implementation manner, the downlink retransmission indication module is further configured to send the downlink retransmission indication to the user equipment.

 For the above-mentioned base station device, in a possible implementation manner, the downlink retransmission module is further configured to receive the downlink status report from the second base station; or the downlink retransmission module is further configured to The second base station sends the downlink status report.

For the above-mentioned base station device, in a possible implementation manner, the method further includes: an uplink retransmission station determining module, configured to determine an uplink retransmission station, where the uplink retransmission station is the first base station and the second a station in the base station for receiving data from the user equipment that is not successfully sent by the user equipment to the first base station and/or the second base station; and an uplink retransmission indication module, and the uplink retransmission station Determining a module connection, configured to send an uplink retransmission indication to the user equipment, where the uplink retransmission indication includes information of the uplink retransmission station. For the above-mentioned base station device, in a possible implementation manner, the uplink retransmission indication module is further configured to send the uplink retransmission indication to the second base station.

 In order to solve the above technical problem, according to still another aspect of the present invention, a user equipment is provided, including: an uplink to-be-retransmitted data determining module, configured to perform data transmission with the user equipment in both the first base station and the second base station The uplink retransmission data is determined according to the uplink status report, where the uplink status report indicates a state in which the first base station and the second base station receive data from the user equipment; and an uplink retransmission module, And the uplink retransmission data determining module is configured to send the uplink retransmission data to an uplink retransmission station, where the uplink retransmission station is a preamble in the first base station and the second base station The station is provided, or the station specified in the uplink retransmission indication received from the first base station, or the uplink granting station is currently allocated to the user equipment in the first base station and the second base station.

 For the above user equipment, in a possible implementation manner, the uplink status report includes a first uplink status report and a second uplink status report, where: the first uplink status report indicates that the first base station is from the a state in which the user equipment receives data, and the second uplink status report indicates a state in which the second base station receives data from the user equipment.

In order to solve the above technical problem, according to still another aspect of the present invention, a user equipment is provided, including: a downlink retransmission indication receiving module, configured to perform data transmission with the user equipment in both the first base station and the second base station. a downlink retransmission indication is received from the first base station, where the downlink retransmission indication includes information of a downlink retransmission station, and the downlink retransmission station is the first base station and the second base station. a station for transmitting, to the user equipment, the first base station and data that the second base station does not successfully send to the user equipment; and a downlink retransmission module, connected to the downlink retransmission indication receiving module, Receiving downlink retransmission data from the downlink retransmission station according to the downlink retransmission indication, where the downlink retransmission data refers to The first base station and the second base station that are transmitted by the downlink retransmission station to the user equipment are not successfully sent to the data of the user equipment.

 For the foregoing user equipment, in a possible implementation manner, the method further includes: a downlink status report feedback module, configured to be connected to the downlink retransmission indication receiving module, configured to send, according to the downlink retransmission indication, a downlink status report to The first base station, where the downlink status report indicates a state in which the user equipment receives data from the first base station and the second base station.

 For the foregoing user equipment, in a possible implementation manner, the downlink status report includes a first downlink status report and a second downlink status report, where: the first downlink status report indicates that the user equipment is from the user equipment a state in which the first base station receives data, and the second downlink state report indicates a state in which the user equipment receives data from the second base station.

 For the foregoing user equipment, in a possible implementation manner, the downlink status report feedback module is further configured, where the downlink retransmission indication indicates that the downlink retransmission station includes the second base station, And transmitting the first downlink status report and the second downlink status report to the second base station.

In order to solve the above technical problem, according to still another aspect of the present invention, a data transmission method is provided. In a case where the first base station and the second base station perform data transmission with the user equipment, the method includes: a data offloading rule between the first base station and the second base station; the first base station sends a data offloading indication to the second base station and the user equipment, where the data offloading indication includes the data offloading rule The first base station divides the downlink data to be transmitted into the first part of the downlink to be transmitted data and the second part of the downlink to be transmitted data according to the data offloading rule; the first base station downlinks the first part of the data to be sent Sending to the user equipment; and the first base station sending the second part of downlink to-be-sent data to the second base station, so that the second base station sends the second part of downlink to-be-sent data to The user equipment. In order to solve the above technical problem, according to still another aspect of the present invention, a data transmission method is provided, where the first base station and the second base station perform data transmission with the user equipment in the UM mode, including: the user equipment Receiving, by the first base station, a data offloading indication, where the data offloading indication includes information of a data offloading rule between the first base station and the second base station; and the user equipment is based on the data offloading indication, An independent reordering timer and a reordering window are maintained for the first base station and the second base station, respectively.

 For the above data transmission method, in a possible implementation manner, an upper boundary of the reordering timer is a maximum sequence number of a data packet currently received by the user equipment; and a lower boundary of the reordering timer a sequence number of the first packet that is not correctly received, determined by the user equipment according to the data offloading rule.

 In order to solve the above technical problem, according to still another aspect of the present invention, a data transmission method is provided, where the first base station and the second base station perform data transmission with the user equipment in an AM mode, including: the user equipment Receiving, by the first base station, a data offloading indication, where the data offloading indication includes information of a data offloading rule between the first base station and the second base station; and the user equipment is based on the data offloading indication, Maintaining a reordering timer for each of the first base station and the second base station, and independently performing status report feedback based on each of the reordering timers.

 For the foregoing data transmission method, in a possible implementation manner, the performing status report feedback based on each of the reordering timers independently includes: determining, by the user equipment, the next maximum possible according to the data offloading rule The sequence number of the acknowledged data packet is correctly received as the maximum possible ACK parameter; and the user equipment loads the determined maximum possible ACK parameter in the status report.

For the foregoing data transmission method, in a possible implementation manner, the performing status report feedback based on each of the reordering timers independently includes: determining, by the user equipment, a maximum that is determined by the first base station Possible ACK parameters and The maximum possible ACK parameters determined for the second base station are loaded in the status report.

 In a possible implementation manner, the data offloading indication further includes location information indicating that the data offloading rule begins to take effect.

 For the above data transmission method, in a possible implementation manner, the location information is a sequence number and/or a superframe number.

 In order to solve the above technical problem, according to still another aspect of the present invention, a base station device is provided, including: a data offloading module, configured to determine, when the first base station and the second base station perform data transmission with the user equipment, a data offloading rule between the first base station and the second base station; a data offloading indication module, configured to connect to the data offloading module, to send a data offloading indication to the second base station and the user equipment, where The data offloading instruction includes the information of the data offloading rule U'J; and the data dividing module is connected to the data offloading module, and is configured to divide the downlink to-be-sent data into the first part of the downlink to-be-sent data according to the data offloading rule. And the second part of the downlink data to be sent, so that the first part of the downlink to-be-sent data is sent to the user equipment, and the second part of the downlink to-be-sent data is sent to the second base station.

 In a possible implementation manner, the data offloading indication further includes location information indicating that the data offloading rule starts to take effect.

 For a base station device, in a possible implementation manner, the location information is a sequence number and/or a superframe number.

In order to solve the above technical problem, according to still another aspect of the present invention, a user equipment is provided, including: a data offloading indication receiving module, configured to perform data transmission between the first base station and the second base station and the user equipment And receiving, by the first base station, a data offloading indication, where the data offloading indication includes information about a data offloading rule between the first base station and the second base station; and a reordering control module, Data offloading indicates that the receiving module is connected for the first base And the second base station maintains an independent reordering timer for the first base station and the second base station, respectively, based on the data offloading indication, when the second base station performs data transmission with the user equipment in the UM mode. Reordering the window, or in the case that the first base station and the second base station perform data transmission with the user equipment in an AM mode, based on the data offload indication, for the first base station and the second The base station maintains a reordering timer, respectively, and independently performs status report feedback based on each of the reordering timers.

 In a possible implementation manner, the data offloading indication further includes location information indicating that the data offloading rule starts to take effect.

 For the above user equipment, in a possible implementation manner, the location information is a serial number and/or a superframe number.

 Beneficial effect

 And determining, by the first base station, the downlink retransmission task allocation when the carrier aggregation between the first base station and the second base station is aggregated, for example, according to the channel condition and/or the load status, including determining the downlink retransmission station and determining the downlink waiting according to the downlink status report. The retransmission data is sent to the user equipment via the downlink retransmission station, and the data transmission method and apparatus according to the foregoing embodiment of the present invention can effectively avoid the case where the first base station and the second base station both transmit data with the user equipment. Due to the different transmission conditions of the two stations, the sorting window moves slowly, which leads to a problem of reduced data transmission efficiency, and the problem of inefficient retransmission or blind retransmission due to the small base station not knowing whether data retransmission should be performed.

 In addition, the data transmission method and apparatus according to the above embodiments of the present invention can implement data offloading by the first base station uniformly controlling the data offloading rule when the carrier aggregation between the first base station and the second base station is aggregated, for example, according to channel conditions and/or load conditions. The seamless switching of U 'J can effectively avoid the loss or repeated transmission of data packets.

Further features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments. DRAWINGS

 BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in FIG

 FIG. 1 is a schematic diagram showing carrier aggregation of a macro base station and a small base station;

 Figure 2a shows a schematic diagram of offloading data based on RLC PDUs;

 2b is a schematic diagram showing data transmission in the UM mode based on RLC PDU in the prior art;

 2c is a schematic diagram showing data transmission in an AM mode based on an RLC PDU in the prior art;

 3 is a flow chart showing a downlink retransmission portion of a data transmission method according to an embodiment of the present invention;

 Figure 3a is a flow chart showing a downlink retransmission portion of a modification of the data transmission method shown in Figure 3;

 4 is a flow chart showing a downlink retransmission portion of a data transmission method according to another embodiment of the present invention;

 FIG. 5 is a flowchart showing an uplink retransmission portion of a data transmission method according to still another embodiment of the present invention; FIG.

 Figure 5a is a flow chart showing an uplink retransmission portion of a modification of the data transmission method shown in Figure 5;

 Figure 5b is a flow chart showing an uplink retransmission portion of another modification of the data transmission method shown in Figure 5;

 6 is a flow chart showing an uplink retransmission portion of a data transmission method according to still another embodiment of the present invention;

FIG. 7 is a flowchart showing a data transmission method according to still another embodiment of the present invention; FIG. 8 is a diagram showing a base station apparatus according to an embodiment of the present invention. a block diagram of the composition of the user equipment of the embodiment;

 FIG. 9 is a block diagram showing the composition of a base station device and a user equipment according to another embodiment of the present invention;

 FIG. 10 is a block diagram showing the composition of a base station apparatus according to still another embodiment of the present invention; and

 FIG. 11 is a block diagram showing the composition of a user equipment according to still another embodiment of the present invention. detailed description

 As described in the Background of the Invention and the Summary of the Invention, the present invention is mainly directed to providing a data transmission method, particularly a data transmission method in the case of carrier aggregation, so that carrier aggregation, especially carrier aggregation between macro and small base stations, does not affect. Increased data transfer efficiency. Further, in order to achieve the above object, the inventors of the present application have proposed a retransmission task allocation, particularly a downlink retransmission task allocation, when a macro base station uniformly controls carrier aggregation between macro and small base stations, for example, according to channel conditions and/or load conditions.

For example, in a data transmission method according to an embodiment of the present invention, in a case where both the first base station and the second base station perform data transmission with the user equipment, the first base station may determine downlink retransmission according to, for example, channel conditions and/or load conditions. And: the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment. For example, in a case where the downlink retransmission station does not include the second base station, the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment; and in the case that the downlink retransmission station includes the second base station, The first base station sends part or all of the downlink to-be-retransmitted data determined according to the downlink status report to the second base station, or sends the second downlink status report and/or the downlink to-be-retransmitted data determined according to the first downlink status report. To the second base station, to enable the second base station to send some or all of the downlink retransmission data to the user equipment. The downlink retransmission station is a site used by the first base station and the second base station to transmit data of the first base station to the user equipment and the second base station is not successfully sent to the user equipment; the downlink status report indicates the user equipment. The status of receiving data from the first base station and the second base station may include a first downlink status report and/or a second downlink status report; the first downlink status report indicates a state in which the user equipment receives data from the first base station; The second downlink status report indicates a status of the user equipment receiving data from the second base station.

 In the following, several specific implementations of the method will be described in detail by taking the first base station as the macro base station and the second base station as the small base station and both performing data transmission with the user equipment based on the RLC PDU data form as an example.

 Example 1

 FIG. 3 is a flow chart showing a downlink retransmission portion of a data transmission method according to an embodiment of the present invention.

 As shown in FIG. 3, in the data transmission method, the macro base station controls a station for downlink retransmission of RLC data, and allocates a task of retransmitting the RLC PDU to a station with better channel quality (steps S311, S312), and notifies The small base station and the UE (steps S321, S322); or, according to the load balancing requirement, the macro base station performs control to perform downlink retransmission by means of diversity transmission (step S313), that is, for data requiring downlink retransmission (specifically RLC PDU and/or PDU segment, where the PDU segment refers to a data packet formed when the original RLC PDU that needs to be retransmitted is re-divided at the time of retransmission), through the macro base station and the small base station Co-transfer (steps S353, S353N, S353Y) to speed up the movement of the window. The specific implementation process is as follows:

First, as shown in FIG. 3, the macro base station may determine, for example, a downlink retransmission station according to a channel condition and/or a load condition, that is, a downlink retransmission of a RLC PDU and/or a small base station that has not been successfully transmitted to the user equipment. Or the site where the PDU is segmented. In a possible implementation manner, the macro base station receives the measurement report message about the macro base station and the small base station fed back by the user equipment, and determines the downlink retransmission station according to the measurement report and the load balancing requirement of the macro base station and the small base station. In a possible specific implementation manner, the macro base station may determine itself as a downlink retransmission station (see step S311 in (a) of FIG. 3), and may also determine the small base station as a downlink retransmission station (see FIG. 3 ( b) Steps of the paragraph S312), it may also be determined that the macro base station and the small base station simultaneously perform retransmission of the downlink RLC PDU (see step S313 of (c) of FIG. 3).

 After determining the downlink retransmission station, the macro base station may send a downlink retransmission indication to the small base station and the user equipment (steps S321, S322). In a possible implementation, the downlink retransmission indication includes at least information indicating that the macro base station controls the downlink retransmission station. In a possible implementation manner, the downlink retransmission indication may further include information indicating the downlink retransmission station, to notify the small base station and the user equipment to be responsible for performing downlink retransmission of the data. In another possible implementation, the downlink retransmission indication includes information indicating whether the small base station is determined as a downlink retransmission station, that is, whether the small base station is to perform downlink retransmission, to determine whether the small base station is to be downlinked. The retransmission is notified to the small base station and the user equipment.

 In this way, the small base station can determine whether it needs to undertake the task of retransmitting the downlink data according to the downlink retransmission indication. For example, if the downlink retransmission station indicated in the downlink retransmission indication received by the small base station does not include the small base station (see (a) in FIG. 3), the small base station only transmits the initial RLC PDU forwarded by the macro base station, Rather than transmitting the RLC PDU or PDU segment that was not successfully transmitted to the user equipment; otherwise, the small base station receives the RLC PDU or PDU segment that needs to be retransmitted from the macro base station (see paragraphs (b) and (c) of Figure 3, steps S352, S353Y), and retransmit these data packets to the UE.

In addition, the user equipment can determine, according to the downlink retransmission indication, a feedback manner of the downlink status report, that is, whether the downlink status report needs to be fed back to the small base station in addition to reporting the downlink status report to the macro base station (step S331) (step S332). The downlink status report indicates a status of the user equipment receiving data from the macro base station and the small base station, and may include a first downlink status report indicating a status of the user equipment receiving data from the macro base station and/or a status indicating that the user equipment receives data from the small base station. The second downlink status report. In a possible implementation manner, the downlink status report may include identifier information of all RLC PDUs or PDU segments that are not correctly received before the next RLC PDU that is expected to be correctly received. For example, if the user equipment receives the downlink retransmission finger The downlink retransmission station indicated in the indication includes a small base station (see paragraphs (b) and (c) of FIG. 3), and after the RLC downlink status report is triggered, the user equipment feeds back the RLC downlink status to both the macro base station and the small base station. Reporting; otherwise, the user equipment reports only the RLC downlink status report to the macro base station (see paragraph (a) of Figure 3).

 Then, when receiving the downlink status report (which may be specifically the RLC status report) fed back by the user equipment (step S331), the macro base station determines, according to the downlink status report, an RLC PDU or a PDU segment that needs to be retransmitted, hereinafter referred to as The data to be retransmitted is downlinked (step S340), and the downlink to-be-retransmitted data is sent to the user equipment via the determined downlink retransmission station (steps S351, S352, S353, S353N, S353Y).

 For example, in the case where the macro base station determines that the macro base station itself is responsible for performing retransmission of RLC PDUs and/or PDU segments (see paragraph (a) of FIG. 3, step S311), that is, if the downlink retransmission station includes only the macro base station itself, The small base station does not need to retransmit the RLC PDU and the PDU segment to be retransmitted to the user equipment, but the macro base station sends the downlink to-be-retransmitted data determined according to the downlink status report fed back by the user equipment to the user equipment (step S351). .

 For another example, in the case where the macro base station determines that the small base station is responsible for downlink retransmission of the RLC PDU and/or PDU segment (see paragraph (b) of FIG. 3, step S312), that is, if the downlink retransmission station includes only the small base station, The macro base station forwards the downlink to-be-retransmitted data determined by the downlink status report fed back by the user equipment to the small base station (step S352), so that the small base station can send the downlink to-be-retransmitted data to the user equipment.

For another example, the macro base station determines that both the macro base station and the small base station need to be responsible for retransmission of RLC PDUs and/or PDU segments (see paragraph (c) of FIG. 3, step S313), that is, the downlink retransmission station includes the macro base station itself. In the case of the small base station, the macro base station determines whether to forward the RLC PDU or the PDU segment to be retransmitted to the small base station according to the needs of the transmission (step S353), so as to determine the downlink toll weight determined according to the downlink status report fed back by the user equipment. The data is divided into the first part of the retransmitted data and the second part of the retransmitted data, and the first part of the retransmitted data is directly sent to the user equipment (step S353N), and the second part of the retransmitted data is forwarded to the user equipment via the small base station ( Step S353Y). In addition, as shown in FIG. 3, the macro base station further re-determines the downlink retransmission station based on the new measurement report reported by the user equipment and/or the new load balancing requirement (steps S3 12, S3 13). It should be noted that although FIG. 3 shows that the macro base station first determines the macro base station itself as the downlink retransmission station, then updates the downlink retransmission station to the small base station based on the measurement report, and then updates the downlink retransmission station based on the measurement report. Examples of the macro base station and the small base station, however, those skilled in the art should understand that the present invention is not limited thereto. In fact, each downlink retransmission station is determined by the macro base station, for example, according to channel conditions and/or load conditions, and should not be limited to the appearance order of the macro base station, the small base station, and the macro small base station, and the measurement report is only An example that can reflect channel conditions.

 According to the above description, the macro base station can uniformly control the retransmission task allocation, especially the downlink retransmission task allocation, during the carrier aggregation between the small and small base stations according to the channel condition and/or the load condition, and the data transmission according to the above embodiment of the present invention. The method can effectively avoid the problem that when the macro base station and the small base station both transmit data with the user equipment, the scheduling window moves slowly due to different transmission conditions of the two stations, thereby causing the data transmission efficiency to be reduced, and the small base station does not know. Whether the problem of inefficient retransmission or blind retransmission caused by data retransmission should be carried out.

 Modification 1

 Fig. 3a is a flow chart showing a downlink retransmission portion of a modification of the data transmission method shown in Fig. 3. The components in Fig. 3a that have the same reference numerals as in Fig. 3 have the same functions, and a detailed description of these components is omitted for brevity.

As shown in FIG. 3a, the main difference between the data transmission method and that shown in FIG. 3 is that the macro base station only notifies the small base station of the downlink retransmission indication (step S321) without notifying the user equipment. In this case, since it is impossible to know, according to the downlink retransmission indication, that the macro base station uniformly controls the downlink retransmission task allocation between the macro and small base stations, the user equipment will always display the first downlink state indicating the state of receiving data from the macro base station. The report feeds back to the macro base station (step S33 1 a), and feeds back a second downlink state report indicating the state of receiving data from the small base station to the small base station (S332a). In other words, in order to achieve the downlink retransmission task For unified control of the allocation, the macro base station needs to receive the second downlink status report from the small base station as shown in Fig. 3a (step S332b).

 Example 2

 4 is a flow chart showing a downlink retransmission portion of a data transmission method according to another embodiment of the present invention. The components in Fig. 4 having the same reference numerals as those in Figs. 3 and 3a have the same functions, and a detailed description of these components will be omitted for the sake of brevity.

 As shown in FIG. 4, the main difference between the data transmission method shown in FIG. 4 and that shown in FIG. 3 is that the macro base station not only notifies the small base station of the downlink retransmission indication (step S421), but does not notify the user equipment; The device then feeds back the downlink status report to the preset site (step S431), such as the macro base station shown in FIG. The downlink retransmission indication is mainly used to indicate whether the small base station is responsible for retransmitting the RLC PDU or the PDU segment. For example, when the macro base station needs the small base station to perform downlink data retransmission, the macro base station can send the relevant downlink status report to the small base station (see paragraph (b) of Fig. 4, step S432). Further, the macro base station may further transmit data that is performed by the macro base station in the initial transmission but needs to be retransmitted in the small base station to the small base station (see paragraph (b) of FIG. 4, step S452), so that the data is heavy by the small base station. Transfer to the user device. The specific implementation process is as follows:

 First, as shown in Figure 4, the macro base station can determine the downlink retransmission site, e.g., based on channel conditions and/or load conditions. In a possible specific implementation manner, the macro base station may determine that the downlink retransmission station does not include the small base station (see (a) in FIG. 4, step S411), and may also determine that the downlink retransmission station includes the small base station (see FIG. 4). In paragraph (b), step S412).

 Then, the macro base station sends a downlink retransmission indication to the small base station (steps S421, S422), where the downlink retransmission indication is mainly used to indicate whether the small base station needs to be responsible for performing downlink data retransmission. In a possible implementation, the downlink retransmission indication may include only indication information about whether to perform retransmission of the RLC PDU (refer to paragraph (a) of FIG. 4, step S 421 ), or may also indicate that the small base station needs to be heavy. The RLC PDU or PDU segment transmitted through the macro base station for the first time transmission (see paragraph (a) of Fig. 4, step S422).

In a possible implementation manner, the small base station according to the received downlink retransmission The indication determines whether local retransmission of the RLC PDU or PDU segment needs to be performed. For example, in the case of determining that the RLC PDU or PDU segment of the primary transmission itself needs to be retransmitted, the small base station further determines the RLC PDU or PDU segment that needs to be retransmitted based on the relevant downlink status report sent by the macro base station (see FIG. 4). (b), steps S431, S441); and, in the case of determining that the RLC PDU or PDU segment to be retransmitted by the macro base station for initial transmission needs to be retransmitted, the small base station further receives the RLC PDU transmitted by the macro base station and needs to be retransmitted or PDU segmentation (see paragraph (b) of Figure 4, steps S452, S453). In a possible implementation, the small base station always preferentially transmits the RLC PDU or PDU segment with the smallest SN (Sequence Number) in the RLC PDU or PDU segment to be retransmitted, so as to speed up the reordering window. The movement.

 As can be seen from the above description, as in the embodiment of the data transmission method shown in FIG. 3 and FIG. 3a, the macro base station can uniformly control the retransmission task allocation during the carrier aggregation between the small and small base stations, for example, according to channel conditions and/or load conditions, in particular It is a downlink retransmission task allocation. The data transmission method embodiment shown in FIG. 4 can also effectively prevent the sorting window from moving due to different transmission conditions of the two stations in the case where the macro base station and the small base station both transmit data with the user equipment. The problem of slow, resulting in reduced data transmission efficiency, and the problem of inefficient retransmission or blind retransmission due to the small base station not knowing whether or not data retransmission should be performed.

It should be noted that although FIG. 3 illustrates a manner in which the user equipment determines to report a downlink status report to the macro base station and the small base station according to the downlink retransmission indication notified by the macro base station, FIG. 3a illustrates that the user equipment will normally receive the data from the macro base station. The first downlink state report of the state is fed back to the macro base station, the second downlink state report indicating the state of receiving data from the small base station is fed back to the small base station, and FIG. 4 shows that the user equipment is preset to feedback the downlink to the macro base station. The status report is taken as an example, but those skilled in the art should understand that the present invention is not limited thereto, and the user equipment can simultaneously feed back the first downlink status report and the second downlink status report to the macro base station and the small base station, and may even only The macro base station or the small base station feeds back the first downlink status report and the second downlink status report. Regardless of the downlink status report feedback mode of the user equipment, the downlink retransmission station determined by the macro base station, for example, according to the channel condition and/or the load status, can finally determine the downlink to retransmit data based on the downlink status report fed back by the user equipment.

 Example 3

 Fig. 5 is a flow chart showing an uplink retransmission portion of a data transmission method according to still another embodiment of the present invention.

 As shown in FIG. 5, in the data transmission method, the user equipment determines, according to the uplink status report fed back by the macro base station and/or the small base station, the uplink to-be-retransmitted data, which may be specifically an RLC PDU or a PDU segment (steps S511, S512). After performing cross-site retransmission on the determined uplink to-be-retransmitted data (steps S521, S522), wherein the uplink status report may include a first uplink status report indicating a status of the macro base station receiving data from the user equipment and/or Or a second uplink status report indicating the status of the small base station receiving data from the user equipment. That is, when receiving the UL grant scheduled by the macro base station or the small base station, the user equipment always uses the allocated UL grant to transmit the RLC PDU or PDU segment that needs to be retransmitted, in preference to the RLC PDU that needs to be newly transmitted. , regardless of which site the previous transmission of these RLC PDUs or PDU segments occurred. That is, when the user equipment determines how to transmit the RLC PDU or PDU segment on the UL grant allocated by the macro base station and the small base station, the allocation station of the UL grant is not considered, and the RLC PDU or PDU segment is not considered. The station that was last transmitted, and always sends the RLC PDU or PDU segment that requires uplink retransmission on the received UL grant.

For example, in a possible implementation manner, the user equipment may grant, in the uplink allocated by the macro base station, the uplink to-be-retransmitted data determined according to the status report fed back by the macro base station itself (paragraph (a) in FIG. 5). The uplink to-be-retransmitted data determined according to the status report fed back by the small base station may be sent to the uplink allocated by the macro base station (paragraph (b) in FIG. 5), and the uplink transmission may be performed on the uplink allocated by the small base station according to the feedback of the small base station. The uplink retransmission data determined by the status report (paragraph (d) in FIG. 5) may also be granted on the uplink allocated by the small base station, and the uplink transmission is determined according to the status report fed back by the macro base station. The data is to be retransmitted (paragraph (c) in Figure 5).

 Modification 2

 Fig. 5a is a flow chart showing an uplink retransmission portion of a modification of the data transmission method shown in Fig. 5.

 As shown in FIG. 5a, the main difference between the data transmission method and the method shown in FIG. 5 is that the retransmission of the uplink retransmission data (specifically, the RLC PDU) is restricted to the macro base station, that is, the macro base station is responsible for The user equipment feeds back an uplink status report, where the uplink status report may be a first uplink status report generated by the macro base station based on its own data reception status, or may be generated by the small base station based on its own data reception status and forwarded to the macro base station. The second uplink status report; and, the user equipment is responsible for transmitting the uplink retransmission data determined according to the received uplink status report to the macro base station. In this way, the update speed of the transmission window on the macro base station side can be increased.

 Modification 3

 Fig. 5b is a flow chart showing an uplink retransmission portion of another modification of the data transmission method shown in Fig. 5.

 As shown in FIG. 5b, the main difference between the data transmission method and the method shown in FIG. 5 and FIG. 5a is that the retransmission of the uplink retransmission data (specifically, the RLC PDU) is restricted to the small base station, that is, the small base station. Responsible for feeding back the uplink status report to the user equipment, where the uplink status report may be a second uplink status report generated by the small base station based on its own data receiving status, or may be generated by the macro base station based on its own data receiving status and forwarded to the macro base station. The first uplink status report; and, the user equipment is responsible for transmitting the uplink retransmission data determined according to the received uplink status report to the small base station. In this way, the update speed of the transmission window on the small base station side can be accelerated.

 Example 4

 Fig. 6 is a flow chart showing an uplink retransmission portion of a data transmission method according to still another embodiment of the present invention.

As shown in FIG. 6, the main difference between the data transmission method shown in FIG. 6 and FIG. 5 is In the data transmission method, the macro base station specifies an uplink retransmission station, that is, is responsible for receiving, from the user equipment, RLC PDUs that have not been successfully transmitted to the macro base station and/or the small base station, and/or in a manner similar to that in Embodiment 1. The station of the PDU segmentation (steps S61 1, S612, S613), and transmitting an uplink retransmission indication to the user equipment after determining the uplink retransmission station (step S620). The uplink retransmission indication includes at least information indicating the determined uplink retransmission station, so that the user equipment can perform the weight of the RLC PDU or the PDU segment to the indicated uplink retransmission station according to the uplink retransmission indication. pass.

 For example, in a possible specific implementation manner, as shown in (a) of FIG. 6, when the macro base station determines that the macro base station itself is an uplink retransmission station (step S611), the user equipment receives the macro base station. And/or the uplink status report fed back by the small base station (steps S63 1 and S632), determining uplink to-be-retransmitted data according to the received uplink status report (step S641), and determining the determined uplink to-be-retransmitted data It is transmitted to the macro base station (step S651).

 For another example, in another possible implementation manner, as shown in (b) of FIG. 6, when the macro base station determines the small base station as the uplink retransmission station (step S612), the user equipment receives the macro base. In the case of the status report fed back by the station and/or the small base station (steps S63 1 and S632), the uplink to-be-retransmitted data is determined according to the received uplink status report (step S642), and the determined uplink to-be-retransmitted data is determined. The packet is transmitted to the small base station (step S652).

 For example, in another possible specific implementation manner, as shown in (c) of FIG. 6, when the macro base station determines that the macro base station itself and the small base station simultaneously serve as the uplink retransmission station (step S613), the user The device may receive an uplink status report fed back by the macro base station and/or the small base station from the macro base station and the small base station (steps S631, S632), and after determining the uplink to-be-retransmitted data according to the received status report (steps S641, S642) And transmitting the determined uplink to-be-retransmitted data to the corresponding site (steps S651, S652).

In addition, as shown in FIG. 6, the macro base station further re-determines the downlink retransmission site based on the new measurement report reported by the user equipment and/or the new load balancing requirement (step S612, S613). It should be noted that although FIG. 6 shows that the macro base station first determines the macro base station itself as an uplink retransmission station, then updates the uplink retransmission station to the small base station based on the measurement report, and then updates the uplink retransmission station based on the measurement report. Examples of the macro base station and the small base station, however, those skilled in the art should understand that the present invention is not limited thereto. In fact, each uplink retransmission station is determined by the macro base station, for example, according to channel conditions and/or load conditions, and should not be limited to the appearance order of the macro base station, the small base station, and the macro small base station, and the measurement report is only An example that can reflect channel conditions.

 Example 5

 FIG. 7 shows a flow chart of a data transmission method according to still another embodiment of the present invention. As shown in FIG. 7, in the data transmission method, the macro base station controls the data offload rule, which may be specifically an SN allocation rule, that is, which data is used by the macro base station side for data on a certain DRB (Data Radio Bearer) The SN sends the RLC PDU and the SNs used by the small base station side to transmit the RLC PDU are uniformly controlled by the macro base station. The specific implementation process is as follows:

 First, the macro base station may determine, according to channel conditions and/or load conditions, a data offload rule when the macro-base station is aggregated between carriers, and may be specifically an SN allocation rule (step S710), and determine the determined SN allocation rule via the SN allocation indication. The small base station and the user equipment are notified (steps S721, S722). For example, in a possible implementation manner, the SN allocation rule determined by the macro base station may be: when SN mod 3≠0, the SN is used by the small base station; and when SN mod 3=0, the SN Used by the macro base station. In this way, the user equipment can know according to the SN allocation indication that RLC PDUs with SNs of 0, 3, 6 ... will be transmitted by the macro base station, and SNs are RLCs of 1, 2, 4, 5, 7, 8... The PDU will be sent through the small base station.

Then, for the UM mode, the user equipment establishes and maintains an independent reordering timer and a reordering window for the macro base station and the small base station, respectively (step S730). The upper bound of the reordering timer maintenance is the SN of the currently received SN maximum RLC PDU, and the lower bound maintained by the reordering timer is the first one determined according to the SN allocation rule. The SN of the correctly received packet.

 For the AM mode, the user equipment establishes and maintains an independent reordering timer (S741) for the macro base station and the small base station, respectively, and the user equipment may separately target the two independent reordering timers when feeding back the RLC downlink status report. The macro base station and the small base station perform status report feedback (steps S742, S743). The VT(A) in the RLC status report should be determined based on the SN allocation rule. The VT (A) indicates that the SN of the next RLC PDU of the RLC PDU that the receiving end has received the ACK (correctly received acknowledgment) in order, and is sometimes referred to as the SN of the RLC PDU of the next largest possible ACK.

 In a possible implementation manner, the user equipment may also feed back the total RLC status report when any RLC status report is triggered, so that the macro base station and the small base station can know the current general transmission status of both parties. Especially for the macro base station, the actual transmission and reception status between the small base station and the user equipment can be known, so that the macro base station reconfigures the SN allocation rule. In a possible specific implementation, two VT(A) are carried in the total RLC status report, that is, the VT(A) values of the macro base station side and the small base station side are carried in the status report. For example, if the SN of the next largest possible ACK packet on the macro base station side is 7 and the SN of the next largest possible ACK packet on the small base station side is 6, then in the total RLC status report, 7 and 6 are respectively Reported as VT(A).

In another possible implementation manner, as shown in FIG. 7, the macro base station may further perform SN allocation rule update according to changes in channel conditions and/or load conditions, etc. (step S750). When performing the SN allocation rule update, the macro base station needs to notify the small base station and the user equipment of the new SN allocation rule's effective point. In a possible implementation, the macro base station further includes, in the SN allocation indication notified to the small base station and the user equipment, location information indicating that the SN allocation rule starts to take effect, for example, from which SN is effective, or from which HFN (super The frame number) and the SN are in effect. Or, in another possible implementation manner, the macro base station sends a new rule start indication to the small base station and the user equipment, so that the user equipment and the small base station can start to obtain the location where the new SN allocation rule starts to be valid according to the new rule start indication. information. In this way, because of the seamless implementation of the SN allocation rules Switching can effectively avoid packet loss or repeated transmission.

 In addition, for the uplink, the macro base station can control the RLC PDUs sent by the user equipment to the macro base station and the small base station by controlling the SN allocation rule. In other words, the macro base station and the small base station maintain two separate receiving windows, and mutually report the RLC status report to the user equipment independently, and the user equipment is based on the status reports fed back by the macro base station and the small base station, respectively, for the macro base station and the small base station. Perform an uplink retransmission. In other words, the user equipment always determines the transmission site of the RLC PDU based on the SN allocation rule sent by the macro base station, that is, the uplink retransmission of the RLC PDU or the PDU segment is sent to the corresponding station according to the SN allocation rule as the initial transmission.

 Example 6

 FIG. 8 is a schematic block diagram showing the composition of a base station device and a user equipment according to an embodiment of the present invention.

 As shown in FIG. 8, the base station device 810, as the first base station, mainly includes a downlink retransmission site determining module 81 1 , a downlink retransmission indication module 812, and a downlink retransmission module 813, where:

 The downlink retransmission site determining module 811 is mainly used to determine the downlink retransmission site according to the channel condition and/or the load condition, for example, in the case where the first base station 810 and the second base station 830 perform data transmission with the user equipment 820. The downlink retransmission station is a site in the first base station 810 and the second base station 830 for transmitting data of the first base station 810 and the second base station 830 to the user equipment 820 to the user equipment 820.

 The downlink retransmission indication module 812 is mainly configured to send a downlink retransmission indication to the second base station 830, where the downlink retransmission indication includes information indicating that the downlink retransmission station is controlled by the first base station 810, and/or represents a second Whether the base station 830 is determined as the information of the downlink retransmission station.

The downlink retransmission module 813 is configured to enable downlink retransmission data determined according to the downlink status report to be sent to the user equipment 820 via the downlink retransmission station. Its The downlink status report indicates the status of the user equipment 820 receiving data from the first base station 810 and the second base station 830, and may include a first downlink status report and/or a second downlink status report, where the first downlink status report indicates the user equipment. 820 receives the status of the data from the first base station 810, and the second downlink status report indicates the status of the user equipment 820 receiving data from the second base station 830.

 For example, if the downlink retransmission station does not include the second base station 830, the downlink retransmission module 813 may send the downlink retransmission data determined according to the first downlink status report and the second downlink status report to the user equipment. And the downlink retransmission module 813 may perform downlink retransmission determined according to the first downlink status report and the second downlink status report, where the downlink retransmission station includes the second base station 830. Sending part or all of the data to the second base station 830, or sending the second downlink status report and/or the downlink to-be-retransmitted data determined according to the first downlink status report to the second base station 830, so that The two base stations 830 undertake some or all of the downlink retransmission tasks.

 In a possible specific implementation manner, the downlink retransmission indication module 812 is further configured to send the downlink retransmission indication to the user equipment 820 (specifically, the downlink retransmission indication receiving module 821 therein). In this case, the user equipment (specifically, the downlink retransmission module 822 therein) can receive downlink retransmission data from the downlink retransmission station according to the downlink retransmission indication. The downlink retransmission data refers to data that the downlink retransmission station transmits to the user equipment 820 the first base station 810 and the second base station 830 has not successfully transmitted to the user equipment 820. In addition, the user equipment 820 (specifically, the downlink status report feedback module 823) can learn, according to the downlink retransmission indication, that the allocation of the downlink retransmission task is uniformly controlled by the first base station 810, so that the second downlink status can be directly The report is sent to the first base station 810, which causes the downlink retransmission module 813 in the first base station 810 to also receive a second downlink status report from the user equipment 820.

For example, if the downlink retransmission indication indicates that the downlink retransmission station does not include the second base station 830, the downlink status report feedback module 823 may take the first downlink. The status report and the second downlink status report are sent to the first base station 810; and, in the case that the downlink retransmission indication indicates that the downlink retransmission station includes the second base station 830, the downlink status report feedback module 823 may be in the A downlink status report and a second downlink status report are sent to the first base station 810, and the first downlink status report and the second downlink status report are sent to the second base station 830.

 However, in a case where the downlink retransmission indication module 812 does not send the downlink retransmission indication to the user equipment 820, the downlink retransmission module 813 may need to receive the second downlink status report from the second base station 830.

 In addition, as shown in FIG. 8, in a possible implementation manner, the user equipment 820 may further include an uplink to-be-retransmitted data determining module 824 and an uplink retransmission module 825, where: the uplink to-be-retransmitted data determining module 824 is mainly used. In the case that the first base station 810 and the second base station 830 perform data transmission with the user equipment 820, the uplink to-be-retransmitted data is determined according to the uplink status report. The uplink status report indicates that the first base station 810 and the second base station 830 receive data from the user equipment, and may include a first uplink status including and/or a second uplink status report, where the first uplink status report indicates that the first base station 810 is The user equipment 820 receives the status of the data, and the second uplink status report indicates the status of the second base station 830 receiving data from the user equipment 820.

 The uplink retransmission module 825 is mainly configured to send the uplink to-be-retransmitted data determined by the uplink to-be-retransmitted data determining module 824 to the uplink retransmission station. The uplink retransmission station is a site in the first base station 810 and the second base station 830 for receiving data from the user equipment 820 that the user equipment 820 has not previously successfully transmitted to the first base station 810 and/or the second base station 830. .

 For example, the uplink retransmission station may be preset to the first base station 810 or may be preset to the second base station 830.

For another example, the uplink retransmission station may allocate an uplink granting station to the user equipment 820 in the first base station 810 and the second base station 830, so that the user equipment 820 can always preferentially transmit data that needs to be retransmitted. Regardless of the data at the time of the initial transmission Whether to send to the first base station 810 or the second base station 830.

 For another example, the uplink retransmission station may be determined and updated by the first base station 810 (specifically, the uplink retransmission station determining module 814 therein), for example, based on actual channel conditions and/or load conditions. In this case, the first base station 810 (specifically, the uplink retransmission indication module 815 therein) will send an uplink retransmission indication to the user equipment 820. The uplink retransmission indication includes information indicating the uplink retransmission station, so that the uplink retransmission module 825 in the user equipment 820 can send data that needs to be retransmitted to the uplink retransmission station.

 Example 7

 FIG. 9 is a schematic block diagram showing the composition of a base station device and a user equipment according to another embodiment of the present invention, according to another embodiment of the present invention.

 As shown in FIG. 9, the base station device 910 can include a data offload module 911, a data offload indication module 912, and a data partitioning module 913, where:

 The data offloading module 911 is primarily used to determine data shunting rules between the first base station 910 and the second base station 930, e.g., based on channel conditions and/or load conditions. The data division module is configured to divide the downlink data to be sent into the first part of the downlink to be transmitted data and the second part of the downlink to be sent data according to the data offloading rule, so that the first part of the downlink to be transmitted data is directly used by the first base station 910. The data is sent to the user equipment 920, and the second part of the downlink to be transmitted data is forwarded to the user equipment 920 via the second base station 930.

The data offloading rule may be specifically an SN allocation rule, that is, for the data on a certain DRB (Data Radio Bearer), which SNs are used by the macro base station side to send RLC PDUs, and which SNs are used by the small base station side. RLC PDU. For example, the SN allocation rule may be: when SN mod 3≠0, the SN is used by the small base station; and when SN mod 3=0, the SN is used by the macro base station. In this way, the user equipment can know according to the SN allocation indication that RLC PDUs with SNs of 0, 3, 6 ... will be transmitted by the macro base station, and SNs are RLCs of 1, 2, 4, 5, 7, 8... PDU will pass The small base station transmits. In a possible specific implementation manner, the data offloading indication may further include location information indicating that the data offloading rule starts to take effect, such as a sequence number and/or a superframe number that is effective.

 The data offload indication module 912 is mainly used to send a data offload indication to the user equipment 920 (specifically, the data offload indication receiving module 921 in it) and the second base station 930. The data offloading indication includes at least information indicating the data offloading rule, so that the second base station 930 can learn the data that needs to be sent by the second base station 930, and the user equipment 920 (specifically, the reordering control module 922 therein) Various windows can be established and maintained for the first base station 910 and the second base station 930, respectively.

 For example, the first base station 910 and the second base station 930 are in UM mode and user equipment.

In the case of data transmission 920, the reordering control module 922 can maintain separate reordering timers and reordering windows for the first base station 910 and the second base station 930, respectively, based on the data offloading rules.

 For another example, in a case where the first base station 910 and the second base station 930 perform data transmission with the user equipment 920 in the AM mode, the reordering control module 922 can be configured for the first base station 910 and the second base station 930 based on the data offloading rule. A reordering timer is separately maintained, and status report feedback is independently performed based on each of the reordering timers.

 Example 8

 Fig. 10 is a block diagram showing the structure of a base station apparatus according to another embodiment of the present invention. The base station device 1000 may be a host server having computing power, a personal computer PC, or a portable computer or terminal that can be carried. The specific embodiment of the present invention does not limit the specific implementation of the computing node.

 The base station device 1000 includes a processor 1010, a communications interface 1020, a memory array 1030, and a bus 1040. The processor 1010, the communication interface 1020, and the memory 1030 complete communication with each other via the bus 1040.

The communication interface 1020 is configured to communicate with a network element, where the network element includes, for example, a virtual machine tube. Management center, shared storage, etc.

 The processor 1010 is for executing a program. The processor 1010 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

 The memory 1030 is for storing files. The memory 1030 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. Memory 1030 can also be a memory array. Memory 1030 may also be partitioned, and the blocks may be combined into virtual volumes according to certain rules.

 In one possible implementation, the above program may be program code including computer operating instructions. The program is specifically configured to: when the first base station and the second base station perform data transmission with the user equipment, the first base station: determining a downlink retransmission station, where the downlink retransmission station is the first a station in the base station and the second base station for transmitting data of the first base station and the second base station that is not successfully sent to the user equipment to the user equipment; and downlink waiting to be determined according to the downlink status report The retransmission data is sent to the user equipment via the downlink retransmission station, where the downlink status report indicates a status of the user equipment receiving data from the first base station and the second base station.

In another possible implementation, the above program may be program code including computer operating instructions. The program is specifically configured to: when the first base station and the second base station perform data transmission with the user equipment, enable the first base station to: determine a data offload rule between the first base station and the second base station Sending a data offloading indication to the second base station and the user equipment, where the data offloading indication includes information of the data offloading rule; dividing the downlink to be transmitted data into the first part of the downlink to be sent according to the data offloading rule Data and a second part of the downlink to be transmitted data; transmitting the first part of the downlink to-be-sent data to the user equipment; and transmitting the second part of the downlink to-be-sent data to the second base station, so that the The second base station sends the second part of downlink to-be-sent data to the user equipment. Example 9

 Figure 11 is a block diagram showing the structure of a base station device in accordance with another embodiment of the present invention. The base station device 1100 may be a host server having a computing capability, a personal computer PC, or a portable computer or terminal that can be carried. The specific embodiment of the present invention does not limit the specific implementation of the computing node.

 The base station device 1100 includes a processor 1110, a communications interface 1120, a memory array 1130, and a bus 1140. The processor 11 10, the communication interface 1 120, and the memory 1 130 complete communication with each other via the bus 1140.

 The communication interface 1120 is configured to communicate with a network element, where the network element includes, for example, a virtual machine management center, shared storage, and the like.

 The processor 1110 is for executing a program. The processor 1110 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

 The memory 1130 is used to store files. The memory 1130 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. Memory 1 130 can also be a memory array. The memory 1130 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.

In a possible implementation, the above program may be program code including computer operating instructions. The program is specifically configured to: when the first base station and the second base station perform data transmission with the user equipment, the user equipment: determining uplink to-be-retransmitted data according to the uplink status report, where the uplink status report indicates a state in which the first base station and the second base station receive data from the user equipment; and transmitting the uplink to-be-retransmitted data to an uplink retransmission station, where the uplink retransmission station is the first base station And a preset site in the second base station, or The station specified in the uplink retransmission indication received by the first base station, or the uplink granting station is currently allocated to the user equipment in the first base station and the second base station.

 In another possible implementation, the above program may be program code including computer operating instructions. The program is specifically configured to: when the first base station and the second base station perform data transmission with the user equipment, the user equipment: receiving, by the first base station, a downlink retransmission indication, where the downlink retransmission Instructing to include information of a downlink retransmission station, where the downlink retransmission station is used by the first base station and the second base station to transmit the first base station to the user equipment, and the second base station is not successfully sent. Receiving downlink retransmission data from the downlink retransmission station according to the downlink retransmission indication, where the downlink retransmission data refers to the downlink retransmission site to the user The first base station transmitted by the device and the second base station fail to successfully send data to the user equipment.

 In another possible implementation, the above program may be program code including computer operating instructions. The program is specifically configured to: when the first base station and the second base station perform data transmission with the user equipment in the UM mode, to enable the user equipment to: receive a data offload indication from the first base station, where the data offloading And indicating information including a data offload rule between the first base station and the second base station; and maintaining an independent reordering timer for the first base station and the second base station, respectively, based on the data offloading indication And reorder the window.

In another possible implementation, the above program may be program code including computer operating instructions. The program is specifically configured to: when the first base station and the second base station perform data transmission with the user equipment in the AM mode, to enable the user equipment to: receive a data offload indication from the first base station, where the data offloading And indicating information including a data offload rule between the first base station and the second base station; and maintaining a reordering timer for the first base station and the second base station, respectively, based on the data offloading indication, And independently based on each of the reordering timers Line status report feedback.

 Those of ordinary skill in the art will appreciate that the various exemplary elements and algorithm steps in the embodiments described herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can select different methods for implementing the described functions for a particular application, but such implementation should not be considered to be beyond the scope of the present invention.

 If the function is implemented in the form of computer software and sold or used as a stand-alone product, it may be considered to some extent that all or part of the technical solution of the present invention (for example, a part contributing to the prior art) is It is embodied in the form of computer software products. The computer software product is typically stored in a computer readable storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

 The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and the invention may also be applied to a heterogeneous network of LTE-A, and any person skilled in the art may Variations or substitutions are readily conceivable within the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request 1. A data transmission method, characterized in that, when both the first base station and the second base station perform data transmission with user equipment, it includes: The first base station determines a downlink retransmission site, where the downlink retransmission site is the first base station and the second base station used to transmit the first base station and the second base station to the user equipment. Sites that did not successfully send data to said user device; and The first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment via the downlink retransmission site, where the downlink status report indicates that the user equipment receives data from the first base station and the Describes the status of the second base station receiving data. 2. The data transmission method according to claim 1, wherein the downlink status report includes a first downlink status report and a second downlink status report, wherein the first downlink status report indicates that the user the status of the device receiving data from the first base station, and The second downlink status report indicates the status of the user equipment receiving data from the second base station. 3. The data transmission method according to claim 1 or 2, characterized in that, at the first base station, the downlink to-be-retransmitted data determined according to the downlink status report is sent to the user equipment via the downlink retransmission site. Before, it also includes the first base station sending a downlink retransmission indication to the second base station, wherein the downlink retransmission indication includes information about the downlink retransmission site, and the information about the downlink retransmission site includes the following information: at least one of: Information indicating that the first base station controls the downlink retransmission station, the identification information of the downlink retransmission station, *, The identification information of the cell of the downlink retransmission site, Information indicating whether the second base station is determined as the downlink retransmission site, and Information indicating whether the first base station is determined as the downlink retransmission site. 4. The data transmission method according to any one of claims 1 to 3, characterized in that the first base station causes the downlink to-be-retransmitted data determined according to the downlink status report to be sent to the downlink retransmission site via the downlink retransmission site. The user equipment includes: When the downlink retransmission site does not include the second base station, The first base station sends the downlink data to be retransmitted determined according to the downlink status report to the user equipment. 5. The data transmission method according to any one of claims 1 to 4, characterized in that the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the downlink retransmission site via the downlink retransmission site. The user equipment includes: In the case where the downlink retransmission site includes the second base station, The first base station sends part or all of the downlink data to be retransmitted determined according to the downlink status report to the second base station, so that the second base station can transmit part or all of the downlink data to be retransmitted. All sent to said user device. 6. The data transmission method according to any one of claims 2 to 4, characterized in that the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the downlink retransmission site via the downlink retransmission site. The user equipment includes: In the case where the downlink retransmission site includes the second base station, The first base station sends the second downlink status report and/or the downlink to-be-retransmitted data determined according to the first downlink status report to the second base station, so that the second base station can transmit the data according to the first downlink status report. The downlink data to be retransmitted determined by the second downlink status report and/or the downlink data to be retransmitted determined according to the first downlink status report are sent to the user equipment. 7. The data transmission method according to claim 3, characterized in that: Before the first base station sends the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment via the downlink retransmission site, it also includes: The first base station sends the downlink retransmission indication to the user equipment. 8. The data transmission method according to any one of claims 1 to 6, characterized in that, at the first base station, the downlink to-be-retransmitted data determined according to the downlink status report is sent to the downlink retransmission site via the downlink retransmission site. Before the user equipment, the method further includes: the first base station receiving the downlink status report from the second base station; or the first base station sending the downlink status report to the second base station. 9. The data transmission method according to any one of claims 1 to 8, further comprising: The first base station determines an uplink retransmission site, where the uplink retransmission site is one of the first base station and the second base station used to receive from the user equipment the unsuccessful transmission of the user equipment to the third base station. a base station and/or a data site of the second base station; and The first base station sends an uplink retransmission indication to the user equipment, where the uplink retransmission indication includes information about the uplink retransmission site. 10. The data transmission method according to claim 9, characterized in that, after the first base station determines the uplink retransmission site, it further includes: The first base station sends the uplink retransmission indication to the second base station. 11. A data transmission method, characterized in that, when both the first base station and the second base station perform data transmission with user equipment, it includes: The user equipment determines the uplink data to be retransmitted based on the uplink status report, wherein the uplink status report indicates the status of the first base station and the second base station receiving data from the user equipment; and The user equipment sends the uplink data to be retransmitted to an uplink retransmission site, where the uplink retransmission site is a preset site among the first base station and the second base station, or a site from the first base station. The station specified in the uplink retransmission indication received by a base station point, or a station among the first base station and the second base station that currently allocates an uplink grant to the user equipment. 12. The data transmission method according to claim 11, wherein the uplink status report includes a first uplink status report and a second uplink status report, wherein The first uplink status report indicates the status of the first base station receiving data from the user equipment; and The second uplink status report indicates the status of the second base station receiving data from the user equipment. 13. A data transmission method, characterized in that, when both the first base station and the second base station perform data transmission with user equipment, it includes: The user equipment receives a downlink retransmission indication from the first base station, wherein the downlink retransmission indication includes information of downlink retransmission sites, and the downlink retransmission sites are the first base station and the second base station. A site for transmitting to the user equipment data that the first base station and the second base station have not successfully sent to the user equipment; and The user equipment receives downlink retransmission data from the downlink retransmission site according to the downlink retransmission indication, wherein the downlink retransmission data refers to the first data transmitted by the downlink retransmission site to the user equipment. The base station and the second base station failed to send data to the user equipment. 14. The data transmission method according to claim 13, characterized in that, before the user equipment receives downlink retransmission data from the downlink retransmission site according to the downlink retransmission indication, it further includes: The user equipment sends a downlink status report to the first base station according to the downlink retransmission indication, where the downlink status report indicates the status of the user equipment receiving data from the first base station and the second base station. . 15. The data transmission method according to claim 14, characterized in that: The above downlink status report includes the first downlink status report and the second downlink status report, where, The first downlink status report indicates the status of the user equipment receiving data from the first base station, and The second downlink status report indicates the status of the user equipment receiving data from the second base station. 16. The data transmission method according to claim 14 or 15, characterized in that, before the user equipment receives downlink retransmission data from the downlink retransmission site according to the downlink retransmission indication, it further includes: In the case where the downlink retransmission site includes the second base station, the user 17. The data transmission method according to any one of claims 1 to 16, characterized in that, The first base station is a macro base station, The second base station is a small base station, and The cell coverage area of the macro base station is larger than the cell coverage area of the small base station. 18. The data transmission method according to any one of claims 1 to 17, characterized in that, The status report is an RLC status report, and The downlink data to be retransmitted and the uplink data to be retransmitted are RLC PDUs and/or PDU segments to be retransmitted. 19. A base station equipment, characterized by including: A downlink retransmission site determination module, configured to determine a downlink retransmission site when the base station equipment serves as both the first base station and the second base station for data transmission with the user equipment, wherein the downlink retransmission site is the third base station. A base station and the second base station are used to transmit the first base station and the second base station to the user equipment without success. the site of the data sent to said user device; and A downlink retransmission module, connected to the downlink retransmission site determination module, configured to send the downlink to-be-retransmitted data determined according to the downlink status report to the user equipment via the downlink retransmission site, wherein, the downlink status The report indicates the status of the user equipment receiving data from the first base station and the second base station. 20. The base station equipment according to claim 19, wherein the downlink status report includes a first downlink status report and a second downlink status report, wherein: the first downlink status report indicates that the user equipment the status of receiving data from said first base station, and The second downlink status report indicates the status of the user equipment receiving data from the second base station. 21. The base station equipment according to claim 19 or 20, further comprising a downlink retransmission indication module connected to the downlink retransmission site determination module, the downlink retransmission indication module being configured to provide the first The second base station sends a downlink retransmission indication, where the downlink retransmission indication includes information about the downlink retransmission site, and the information about the downlink retransmission site includes at least one of the following information: Information indicating that the first base station controls the downlink retransmission station, the identification information of the downlink retransmission station, *, The identification information of the cell of the downlink retransmission site, Information indicating whether the second base station is determined as the downlink retransmission site, and Information indicating whether the first base station is determined as the downlink retransmission site. 22. The base station equipment according to any one of claims 19 to 21, characterized in that the downlink retransmission module is configured to: when the downlink retransmission site does not include the second base station, Send the downlink data to be retransmitted determined according to the downlink status report to the User equipment. 23. The base station equipment according to any one of claims 19 to 22, characterized in that the downlink retransmission module is configured to: when the downlink retransmission site includes the second base station, Send part or all of the downlink data to be retransmitted determined according to the downlink status report to the second base station, so that the second base station can send part or all of the downlink data to be retransmitted to the User equipment. 24. The base station equipment according to any one of claims 20 to 23, characterized in that the downlink retransmission module is configured to: when the downlink retransmission site includes the second base station, Send the second downlink status report and/or the downlink to-be-retransmitted data determined according to the first downlink status report to the second base station, so that the second base station can transmit the data according to the second downlink status report to the second base station. The downlink data to be retransmitted determined by the status report and/or the downlink data to be retransmitted determined according to the first downlink status report is sent to the user equipment. 25. The base station equipment according to claim 21, characterized in that the downlink retransmission indication module is further configured to send the downlink retransmission indication to the user equipment. 26. The base station equipment according to any one of claims 19 to 25, characterized in that, The downlink retransmission module is further configured to receive the downlink status report from the second base station; or The downlink retransmission module is further configured to send the downlink status report to the second base station. 27. The base station equipment according to any one of claims 19 to 26, further comprising: The uplink retransmission site determination module is used to determine the uplink retransmission site, wherein the The uplink retransmission site is a site in the first base station and the second base station that is used to receive data from the user equipment that the user equipment failed to send to the first base station and/or the second base station. ; as well as The uplink retransmission indication module is connected to the uplink retransmission site determination module, and is used to send an uplink retransmission indication to the user equipment, where the uplink retransmission indication includes information about the uplink retransmission site. 28. The base station equipment according to claim 27, wherein the uplink retransmission indication module is further configured to send the uplink retransmission indication to the second base station. 29. A user equipment, characterized by: including: The uplink data to be retransmitted determination module is configured to determine the uplink data to be retransmitted based on the uplink status report when both the first base station and the second base station perform data transmission with the user equipment, wherein the uplink status report indicates The status of the first base station and the second base station receiving data from the user equipment; and An uplink retransmission module, connected to the uplink retransmission data determination module, is used to send the uplink data to be retransmitted to an uplink retransmission site, where the uplink retransmission site is the first base station and the third base station. The preset site in the two base stations is either the site specified in the uplink retransmission indication received from the first base station, or the first base station and the second base station currently allocate to the user equipment. Upward grant site. 30. The user equipment according to claim 29, wherein the uplink status report includes a first uplink status report and a second uplink status report, wherein: the first uplink status report indicates that the first base station has the status of the user equipment receiving data, and The second uplink status report indicates the status of the second base station receiving data from the user equipment. 31. A user equipment, characterized by: including: A downlink retransmission indication receiving module, configured to receive a downlink retransmission indication from the first base station when both the first base station and the second base station perform data transmission with the user equipment, wherein, the downlink retransmission indication Contains information about downlink retransmission sites. The downlink retransmission sites are the first base station and the second base station used to transmit the first base station to the user equipment and the second base station failed to transmit to the user equipment. the site of the user equipment data; and A downlink retransmission module, connected to the downlink retransmission indication receiving module, is configured to receive downlink retransmission data from the downlink retransmission site according to the downlink retransmission indication, where the downlink retransmission data refers to the downlink retransmission data. Retransmit the data transmitted by the station to the user equipment from the first base station and the data that the second base station failed to send to the user equipment. 32. The user equipment according to claim 31, further comprising: a downlink status report feedback module, connected to the downlink retransmission indication receiving module, and configured to obtain the downlink status according to the downlink retransmission indication. The report is sent to the first base station, where the downlink status report indicates the status of the user equipment receiving data from the first base station and the second base station. 33. The user equipment according to claim 32, wherein the downlink status report includes a first downlink status report and a second downlink status report, wherein: the first downlink status report indicates that the user equipment the status of receiving data from said first base station, and The second downlink status report indicates the status of the user equipment receiving data from the second base station. 34. The user equipment according to claim 32 or 33, wherein the downlink status report feedback module is further configured to: when the downlink retransmission indication indicates that the downlink retransmission site includes the second base station In the case of , the first downlink status report and the second downlink status report are also sent to the second base station. 35. A data transmission method, characterized in that, when both the first base station and the second base station perform data transmission with user equipment, it includes: The first base station determines a data offloading rule between the first base station and the second base station; The first base station sends a data offload instruction to the second base station and the user equipment, where the data offload instruction contains information about the data offload rule; Divide the downlink data to be sent into the first part of the downlink data to be sent and the second part of the downlink data to be sent; The first base station sends the first part of the downlink data to be sent to the user equipment; and The first base station sends the second part of the downlink data to be sent to the second base station, so that the second base station sends the second part of the downlink data to be sent to the user equipment. 36. A data transmission method, characterized in that, when both the first base station and the second base station perform data transmission with user equipment in UM mode, it includes: The user equipment receives a data offload indication from the first base station, wherein the data offload indication includes information on data offload rules between the first base station and the second base station; and The user equipment maintains independent reordering timers and reordering windows respectively for the first base station and the second base station based on the data offload indication. 37. The data transmission method according to claim 36, wherein the upper boundary of the reordering timer is the maximum sequence number of the data packet currently received by the user equipment; and The lower boundary of the reordering timer is the sequence number of the first data packet that is not received correctly and is determined by the user equipment according to the data offloading rule. 38. A data transmission method, characterized in that, when both the first base station and the second base station perform data transmission with the user equipment in AM mode, it includes: The user equipment receives a data offload indication from the first base station, wherein the data offload indication includes information on data offload rules between the first base station and the second base station; and Based on the data offload indication, the user equipment maintains a reordering timer for the first base station and the second base station respectively, and independently performs status report feedback based on each of the reordering timers. 39. The data transmission method according to claim 38, characterized in that: performing status report feedback independently based on each of the reordering timers includes: the user equipment determines the next one according to the data offloading rule. The sequence number of the most likely correctly received confirmed data packet is used as the maximum possible ACK parameter; and the user equipment loads the determined maximum possible ACK parameter in the status report. 40. The data transmission method according to claim 39, characterized in that: performing status report feedback independently based on each of the reordering timers further includes: the user equipment determines for the first base station The maximum possible ACK parameter of and the maximum possible ACK parameter determined for the second base station are both loaded in the status report. 41. The data transmission method according to any one of claims 35 to 40, characterized in that the data offload indication also includes location information indicating that the data offload rule begins to take effect. 42. The data transmission method according to claim 41, the location information is a sequence number and/or a superframe number. 43. A base station equipment, characterized by including: A data offloading module, configured to determine the data offloading rules between the first base station and the second base station when both the first base station and the second base station perform data transmission with the user equipment; A data shunt indication module is connected to the data shunt module and is used to report to the The second base station and the user equipment send a data offload indication, where the data offload indication includes information about the data offload rule; and A data dividing module, connected to the data shunting module, is used to divide the downlink to-be-sent data according to the data shunting rule into a first part of the downlink to-be-sent data and a second part of the downlink to-be-sent data, so that the first part of the downlink to-be-sent data is The transmission data is sent to the user equipment, and the second part of downlink data to be sent is sent to the second base station. 44. The base station equipment according to claim 43, wherein the data offload indication further includes location information indicating that the data offload rule begins to take effect. 45. The base station equipment according to claim 44, the location information is a sequence number and/or a superframe number. 46. A user equipment, characterized by: including: A data offload indication receiving module, configured to receive a data offload indication from the first base station when both the first base station and the second base station perform data transmission with the user equipment, wherein the data offload indication includes the Information on data offloading rules between the first base station and the second base station; and A reordering control module, connected to the data offload indication receiving module, configured to perform data transmission based on the data offload indication when the first base station and the second base station perform data transmission with the user equipment in UM mode. , maintaining independent reordering timers and reordering windows respectively for the first base station and the second base station; or In the case where the first base station and the second base station perform data transmission with the user equipment in AM mode, based on the data offload indication, maintain a redundancy for the first base station and the second base station respectively. Reorder timers, and perform status report feedback independently based on each of the reordering timers. 47. The user equipment according to claim 46, wherein the data offload indication further includes location information indicating that the data offload rule begins to take effect. . The user equipment according to claim 47, the location information is a sequence superframe number.