CN108632933B - Data transmission method and device and user equipment - Google Patents
Data transmission method and device and user equipment Download PDFInfo
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- CN108632933B CN108632933B CN201710178216.0A CN201710178216A CN108632933B CN 108632933 B CN108632933 B CN 108632933B CN 201710178216 A CN201710178216 A CN 201710178216A CN 108632933 B CN108632933 B CN 108632933B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
A data transmission method, a device and user equipment are provided, wherein the data transmission method comprises the following steps: receiving data stream information to which a data packet which is not successfully transmitted belongs when a cell is switched or after the cell is switched; and generating a status report aiming at the data stream according to the data stream information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to the target base station. The technical scheme of the invention can realize lossless transmission of data during switching.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method, an apparatus, and a user equipment.
Background
In the fifth Generation mobile communication technology (5th-Generation,5G), in order to separate the control plane and the user plane, a Service packet includes Quality of Service (QoS) information of the Service. For downlink, after receiving a data packet sent by a core network, a base station schedules transmission resources by using a proper scheduling policy according to QoS information contained therein, so that the data packet is sent to User Equipment (UE) under the condition of meeting a QoS requirement. A UE may initiate multiple services, each with a particular QoS, and the QoS of different services may be the same, similar, or different altogether. Each service may be referred to as a QoS Data Flow (Flow), and the base station may map different flows with the same or similar QoS to the same Data Radio Bearer (DRB) according to its scheduling algorithm, and map flows with greatly different QoS to different DRBs. In Layer 2(Layer 2), there is a newly introduced Layer dedicated to mapping Flow to DRB, where the Layer is located above a Packet Data Convergence Protocol (PDCP) Layer, and the Layer 2 has four layers in total, which are a newly introduced Layer, a PDCP Layer, a Radio Link Control Protocol (RLC) Layer, and a Medium Access Control (MAC) Layer, respectively.
In handover, the target base station may have different scheduling policy from the source base station, and for multiple flows established by the UE, the target base station may map the flows onto different DRBs, for example, before handover, the source base station maps Flow1 and Flow2 onto DRB1, after handover, the target base station maps Flow1 onto DRB1, and maps Flow2 onto DRB 2. Generally, in the process of handover, it is necessary to ensure that data is complete and not lost, for example, for downlink data transmission, a source base station forwards an untransmitted data packet to a target base station in the handover process (starting from a first data packet unsucknowledged for successful transmission, and forwarding with DRB as granularity), and a UE can send a PDCP status report (PDCP status report) to the target base station after handover, so that the target base station can determine which data packets have been correctly received by the UE and which data packets have not been correctly received by the UE, the target base station transmits the unacknowledged data packets to the UE, the UE orders the received data packets with the received data packets, and then sends the data packets to a higher layer of the UE in order, so that lossless handover of data can be achieved.
However, the above method can only be used for scenes in which the data stream mapping is not changed at the time of switching. If the mapping of the data stream changes during the handover, the target base station cannot accurately know whether the source base station has a data packet which is not transmitted to the UE before the handover for the data stream mapped to the new bearer, which may cause a data loss phenomenon and affect the user experience.
Disclosure of Invention
The invention solves the technical problem of how to realize the lossless transmission of data during switching.
To solve the foregoing technical problem, an embodiment of the present invention provides a data transmission method, where the data transmission method includes:
receiving data stream information to which a data packet which is not successfully transmitted belongs when a cell is switched or after the cell is switched; and generating a status report aiming at the data stream according to the data stream information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to the target base station.
Optionally, the receiving data flow information to which the unsuccessfully transmitted data packet belongs includes: and when receiving a switching command sent by a source base station, receiving data stream information to which the unsuccessfully transmitted data packet sent by the source base station belongs, wherein the source base station is a base station before switching, and a target base station is a base station after switching.
Optionally, the data transmission method further includes: and when receiving the switching command sent by the source base station, receiving a first mapping relation between the switched data stream and the data radio bearer.
Optionally, the receiving data flow information to which the unsuccessfully transmitted data packet belongs includes: and after the switching completion signaling is sent, receiving data stream information which is sent by a target base station and to which the unsuccessfully transmitted data packet belongs, wherein the source base station is a base station before switching, and the target base station is a base station after switching.
Optionally, the target base station explicitly indicates the first mapping relationship in the handover request response.
Optionally, the generating a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to the target base station includes: generating a status report aiming at the data flow according to the data flow information of the unsuccessfully transmitted data packet and the receiving status of the unsuccessfully transmitted data packet; determining a data radio bearer mapped by the data stream of the unsuccessfully transmitted data packet after switching according to the data stream information to which the unsuccessfully transmitted data packet belongs and the first mapping relation; and sending the status reports of the data streams mapped in the same data radio bearer to the target base station.
Optionally, after receiving the handover request response sent by the target base station, the source base station forwards the unsuccessfully transmitted data packet to the target base station.
Optionally, the source base station forwards the unsuccessfully transmitted data packet to the target base station together; or, the source base station forwards the unsuccessfully transmitted data packets in the same data stream to the target base station together.
Optionally, after receiving the status report, the target base station determines, according to the status report, an unsuccessfully received data packet, and sends the unsuccessfully received data packet, where the unsuccessfully received data packet is at least a part of the unsuccessfully transmitted data packet.
Optionally, the data transmission method further includes: when the data packet sequence number in each data stream is discontinuous, when the unsuccessfully received data packet is received, the receiving window is adjusted according to the data stream information and the data packet sequence number to which the unsuccessfully received data packet belongs.
Optionally, when the target base station sends the unsuccessfully received data packet or the new data packet, in each data stream, after the successfully received data packet with the maximum sequence number, sequentially transmitting the data packets after the data packet with the maximum sequence number; or, when the target base station sends the unsuccessfully received data packet or the new data packet, in the unsuccessfully transmitted data packet, after the successfully received data packet with the maximum sequence number, sequentially transmitting the data packets after the data packet with the maximum sequence number.
Optionally, when the source base station sends the handover request to the target base station, the second mapping relationship between the data stream before handover and the data radio bearer is explicitly indicated.
Optionally, the unsuccessfully transmitted data packets include data packets that are not sent by the source base station and data packets that are sent by the source base station and have not received acknowledgement feedback.
In order to solve the above technical problem, an embodiment of the present invention further discloses a data transmission device, where the data transmission device includes:
the data flow information receiving module is suitable for receiving the data flow information to which the unsuccessfully transmitted data packet belongs when the cell is switched or after the cell is switched; and the status report sending module is suitable for generating a status report aiming at the data flow according to the data flow information of the unsuccessfully transmitted data packet and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to the target base station.
Optionally, the data stream information receiving module includes: the first data flow information receiving unit is adapted to receive data flow information to which the unsuccessfully transmitted data packet sent by a source base station belongs when receiving a handover command sent by the source base station, wherein the source base station is a base station before handover, and a target base station is a base station after handover.
Optionally, the data stream information receiving module further includes: and a first receiving unit, adapted to receive a first mapping relationship between a switched data stream and a data radio bearer when receiving the handover command sent by the source base station.
Optionally, the data stream information receiving module includes: and the second data flow information receiving unit is suitable for receiving the data flow information which is sent by the target base station and to which the unsuccessfully transmitted data packet belongs after sending the switching completion signaling, wherein the source base station is a base station before switching, and the target base station is a base station after switching.
Optionally, when receiving a handover request response sent by the target base station, the source base station receives the first mapping relationship sent by the target base station.
Optionally, the target base station explicitly indicates the first mapping relationship in the handover request response.
Optionally, the status report sending module includes: a status report generating unit, adapted to generate a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet; a data radio bearer determining unit, adapted to determine, according to the data flow information to which the unsuccessfully transmitted data packet belongs and the first mapping relationship, a data radio bearer to which the data flow of the unsuccessfully transmitted data packet is mapped after the handover; and the status report sending unit is suitable for sending the status reports of the data flows mapped in the same data radio bearer to the target base station together.
Optionally, after receiving the handover request response sent by the target base station, the source base station forwards the unsuccessfully transmitted data packet to the target base station.
Optionally, the source base station forwards the unsuccessfully transmitted data packet to the target base station together; or, the source base station forwards the unsuccessfully transmitted data packets in the same data stream to the target base station together.
Optionally, after receiving the status report, the target base station determines, according to the status report, an unsuccessfully received data packet, and sends the unsuccessfully received data packet, where the unsuccessfully received data packet is at least a part of the unsuccessfully transmitted data packet.
Optionally, the data transmission apparatus further includes: and the receiving window adjusting module is suitable for adjusting a receiving window according to the data flow information and the data packet sequence number of the unsuccessfully received data packet when the data packet sequence number in each data flow is discontinuous and the unsuccessfully received data packet is received.
Optionally, when the target base station sends the unsuccessfully received data packet or the new data packet, in each data stream, after the successfully received data packet with the maximum sequence number, sequentially transmitting the data packets after the data packet with the maximum sequence number; or, when the target base station sends the unsuccessfully received data packet or the new data packet, in the unsuccessfully transmitted data packet, after the successfully received data packet with the maximum sequence number, sequentially transmitting the data packets after the data packet with the maximum sequence number.
Optionally, when the source base station sends the handover request to the target base station, the second mapping relationship between the data stream before handover and the data radio bearer is explicitly indicated.
Optionally, the unsuccessfully transmitted data packets include a data packet that is not sent by the source base station and a data packet that is sent by the source base station and has not received acknowledgement feedback
In order to solve the above technical problem, an embodiment of the present invention further discloses a user equipment, where the user equipment includes the data transmission device.
The embodiment of the invention also discloses a data transmission method, which comprises the following steps:
when receiving a switching request, acquiring a second mapping relation between a data stream before switching and a data radio bearer; after receiving a switching completion signaling sent by user equipment, receiving a status report of unsuccessfully transmitted data packets sent by the user equipment; and determining the receiving state of the unsuccessfully transmitted data packet according to the first mapping relation, the second mapping relation and the state report of the switched data stream and data radio bearer.
Optionally, the data transmission method further includes: determining unsuccessfully received data packets according to the receiving state, wherein the unsuccessfully received data packets are at least one part of the unsuccessfully transmitted data packets; and sending the unsuccessfully received data packet to the user equipment.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the technical scheme of the invention is that when the cell is switched or after the cell is switched, the data flow information to which the unsuccessfully transmitted data packet belongs is received; and generating a status report aiming at the data stream according to the data stream information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to the target base station. According to the technical scheme, the user equipment can generate a state report aiming at the data flow according to the data flow information to which the data packet which is not successfully transmitted belongs and send the state report to the target base station; therefore, the switched target base station can know the state of actually receiving the data packet by the user equipment, and further can accurately send the data packet which is not received by the user equipment to the user equipment in the subsequent steps, so that the lossless transmission of data during switching is realized, the loss of the data packet is avoided, and the user experience is improved.
Further, when receiving a handover command sent by a source base station, the source base station receives data stream information to which the unsuccessfully transmitted data packet sent by the source base station belongs, where the source base station is a pre-handover base station, and a target base station is a post-handover base station. In the technical scheme of the invention, when the user equipment receives the switching command sent by the source base station in the switching process, the data flow information to which the unsuccessfully transmitted data packet belongs is received, thereby saving signaling overhead.
Further, after the handover completion signaling is sent, receiving data stream information to which the unsuccessfully transmitted data packet sent by the target base station belongs, wherein the source base station is a pre-handover base station, and the target base station is a post-handover base station. After the user equipment completes the switching, receiving data stream information which is sent by a target base station and to which the unsuccessfully transmitted data packet belongs; through the interaction between the target base station and the user equipment, the resource of the source base station can be prevented from being occupied, and the communication efficiency of the base station is improved.
Drawings
FIG. 1 is a flow chart of a data transmission method according to an embodiment of the present invention;
FIG. 2 is a flow chart of another data transmission method according to an embodiment of the present invention;
FIG. 3 is a flow chart of yet another data transmission method according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present invention.
Detailed Description
As described in the background, the above-mentioned method in the prior art can only map a scene with no change for a data stream at the time of switching. If the mapping of the data stream changes during the handover, the target base station cannot accurately know whether the source base station has a data packet which is not transmitted to the UE before the handover for the data stream mapped to the new bearer, which may cause a data loss phenomenon and affect the user experience.
According to the technical scheme, the user equipment can generate a state report aiming at the data flow according to the data flow information to which the data packet which is not successfully transmitted belongs and send the state report to the target base station; therefore, the switched target base station can know the state of actually receiving the data packet by the user equipment, and further can accurately send the data packet which is not received by the user equipment to the user equipment in the subsequent steps, so that the lossless transmission of data during switching is realized, the loss of the data packet is avoided, and the user experience is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a data transmission method according to an embodiment of the present invention.
The data transmission method in this embodiment may be applied to the user equipment side.
The data transmission method shown in fig. 1 may include the steps of:
step S101: receiving data stream information to which a data packet which is not successfully transmitted belongs when a cell is switched or after the cell is switched;
step S102: and generating a status report aiming at the data stream according to the data stream information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to the target base station.
In a specific implementation, when cell handover occurs, a base station accessed by user equipment is handed over from a source base station to a target base station. In step S101, data flow information to which a data packet that has not been successfully transmitted belongs is received during or after cell handover. For example, the Sequence Number (SN) of the unsuccessfully transmitted packet is 21, 22, 23 to 40, respectively, where the Flow information of the packet with the odd sequence number is Flow1, and the Flow information of the packet with the even sequence number is Flow 2. The data Flow information to which the unsuccessfully transmitted data packet that the user equipment needs to receive may be that the sequence number of the unsuccessfully transmitted data packet of Flow1 is 21, 23, 25, 27, 29, 31, 33, 35, 37, 39; the unsuccessfully transmitted packet sequence numbers of Flow2 are 22, 24, 26, 28, 30, 32, 34, 36, 38, 40.
It should be understood by those skilled in the art that the sequence numbers of the packets in different flows in the practical application scenario may be continuous or discontinuous.
Further, the data flow information to which the unsuccessfully transmitted data packet belongs may be transmitted by the source base station, or may be transmitted by the target base station. That is, the source base station or the target base station needs to transmit the sequence number of the packet in Flow1 and the sequence number of the packet in Flow2 to the UE.
Further, the unsuccessfully transmitted data packet may include a data packet that is not sent by the source base station and a data packet that is sent by the source base station and has not received acknowledgement feedback. Specifically, the unsuccessful transmission is for the source base station, wherein the unsuccessfully transmitted data packet may include a data packet that the UE has received but the source base station has not confirmed the successful transmission.
In a specific implementation, in step S102, the ue may generate a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the reception status of the unsuccessfully transmitted data packet. Specifically, the receiving status of the unsuccessfully transmitted data packet may indicate whether the UE receives the data packet. The status report may be a PDCP status report.
For example, for unsuccessfully transmitted packets with PDCP sequence numbers 21, 22, 23 to 40, respectively, the UE has successfully received packets with sequence numbers 24, 25, 28, 29, and then the UE may generate status reports for Flow1 and Flow2, respectively, according to the data Flow information to which different packets belong and the packet information that has been received (sequence numbers 24, 25, 28, 29); for the packets with sequence numbers 21, 23, 25, 27, 29, 31, 33, 35, 37, 39 in Flow1, respectively indicate 0, 1, 0(0 indicates not received, 1 indicates received), to sequentially indicate whether the packets are received; similarly, for the packets with sequence numbers 22, 24, 26, 28, 30, 32, 34, 36, 38, 40 in Flow2, 0, 1, 0 are indicated respectively to indicate whether the packets are received in sequence.
In step S102, the user equipment transmits a status report for the data flow to the target base station. The target base station can judge whether the user equipment really receives and does not receive the data packets according to the state report aiming at the data stream, and then the data packets which are not received are sent to the user equipment again, so that the loss of the data packets is avoided, and meanwhile, the received data packets are prevented from being sent to the user equipment again to save wireless transmission resources.
It should be noted that the data transmission method of the present embodiment may be used in the following scenarios: compared with the data radio bearer mapped by the source base station side, the target base station maps a plurality of data streams to more data radio bearers, for example, 2 data streams are mapped to one data radio bearer before handover, and 2 data streams are mapped to two data radio bearers after handover.
According to the embodiment of the invention, the user equipment can generate a state report aiming at the data flow according to the data flow information to which the data packet which is not successfully transmitted belongs and send the state report to the target base station; therefore, the switched target base station can know the state of actually receiving the data packet by the user equipment, and further can accurately send the data packet which is not received by the user equipment to the user equipment in the subsequent steps, so that the lossless transmission of data during switching is realized, the loss of the data packet is avoided, and the user experience is improved.
Fig. 2 is a flowchart of another data transmission method according to an embodiment of the present invention. The data transmission method in this embodiment may be applied to the user equipment side.
It should be understood by those skilled in the art that the procedure of cell handover may include the following steps: the UE sends a measurement report, e.g., a measurement report that the signal quality of the target cell is above a predetermined threshold, to the source base station. And after receiving the measurement report, the source base station makes a switching decision and sends a switching request to the target base station. If the target base station allows the access of the UE, a handover request response is returned to the source base station after allocating necessary radio parameters. And after receiving the switching request response, the source base station sends a switching command to the UE, wherein the switching command comprises the wireless parameters distributed to the UE by the target base station. And the UE accesses the target base station according to the wireless parameters in the switching command and sends a switching completion signaling to the target base station.
The data transmission method shown in fig. 2 may include the steps of:
step S201: when receiving a switching command sent by a source base station, receiving data stream information to which the unsuccessfully transmitted data packet sent by the source base station belongs;
step S202: when receiving the switching command sent by the source base station, receiving a first mapping relation between the switched data stream and a data radio bearer;
step S203: generating a status report aiming at the data flow according to the data flow information of the unsuccessfully transmitted data packet and the receiving status of the unsuccessfully transmitted data packet;
step S204: determining a data radio bearer mapped by the data stream of the unsuccessfully transmitted data packet after switching according to the data stream information to which the unsuccessfully transmitted data packet belongs and the first mapping relation;
step S205: and sending the status reports of the data streams mapped in the same data radio bearer to the target base station.
In a specific implementation, in step S201, the ue may receive, when receiving a handover command sent by a source base station, data flow information to which the unsuccessfully transmitted data packet sent by the source base station belongs, so as to save signaling overhead.
In a specific implementation, in step S202, the ue may further receive a first mapping relationship between a data stream after handover and a data radio bearer when receiving a handover command sent by the source base station. In particular, the first mapping relation may represent a mapping relation of data flows and data radio bearers at the target base station side. That is, before step S202, the target base station has already transmitted the first mapping relationship to the source base station, so that the source base station may transmit the first mapping relationship to the user equipment through the handover command.
Preferably, when receiving a handover request response sent by the target base station, the source base station receives the first mapping relationship sent by the target base station together. In other words, before the source base station sends the handover command to the user equipment, the target base station sends the first mapping relationship to the source base station through the handover request response.
Further, the target base station explicitly indicates the first mapping relationship in the handover request response. That is, the source base station can directly obtain the first mapping relationship from the handover request response without other parsing operations, thereby ensuring that the source base station can accurately and quickly receive the first mapping relationship.
Specifically, the radio parameters configured for the UE on the base station side are all located in a container (container) of one access stratum, and the Xn interface between the base stations does not need to understand the radio parameters. If the target base station puts the first mapping relation into the container, in the switching process, the source base station needs to analyze the wireless parameters in the container through a Radio Resource Control (RRC) protocol, and then knows whether the mapping change from Flow to DRB occurs, so that the source base station cannot quickly identify whether the mapping change from Flow to DRB occurs when receiving the switching request response of the target base station. Further, when the source base station and the target base station belong to different protocol versions, for example, the target base station is a high-version base station, and the source base station is a low-version base station, at this time, if the target base station configures radio parameters that can only be applied by the high-version base station for the UE, the source base station cannot identify whether the Flow-to-DRB mapping change occurs when receiving the handover request response sent by the target base station. Therefore, the target base station may explicitly indicate the mapping relationship (i.e., the first mapping relationship) from the Flow to the DRB after the handover in the handover request response.
In a specific implementation, in step S203, the ue may generate a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the reception status of the unsuccessfully transmitted data packet. Specifically, the user equipment may directly transmit the status report for the data flow to the target base station.
Further, in step S204, the ue may further determine, according to the first mapping relationship, a data radio bearer mapped by the data stream of the unsuccessfully transmitted data packet after the handover; then, in step S204, the status reports mapped to the data streams of the same data radio bearer are sent to the target base station together.
The following description is made in detail with reference to specific examples. The source base station maps Flow1 and Flow2 to DRB1 before handover; after the handover, the target base station maps Flow1 and Flow2 to DRB1 and DRB2, respectively (i.e., a first mapping relationship). For unsuccessfully transmitted data packets with PDCP sequence numbers of 21, 22, 23 to 40 respectively, wherein the data Flow information to which the data packet with the odd sequence number belongs is Flow1, and the data Flow information to which the data packet with the even sequence number belongs is Flow 2; the UE has successfully received the data packets with sequence numbers 24, 25, 28, 29, the UE may generate status reports of 0, 1, 0 and 0, 1, 0 for Flow1 and Flow2, respectively, to sequentially indicate whether the data packets are received. The UE may transmit status reports generated for Flow1 and Flow2, respectively, to the target base station.
In another non-limiting embodiment, the pre-handoff source base station maps Flow1, Flow2, and Flow3 to DRB 1; after the handover, the target base station maps Flow1 and Flow2 to DRB1, and maps Flow3 to DRB2 (i.e., the first mapping relationship). After generating the status reports for Flow1, Flow2, and Flow3, the UE determines that both Flow1 and Flow2 are mapped to DRB1 according to the first mapping relationship, and may merge the status reports for Flow1 and Flow2 and send the merged status reports to the target base station.
Preferably, after receiving the handover request response sent by the target base station, the source base station forwards the unsuccessfully transmitted data packet to the target base station. Further, the source base station forwards the unsuccessfully transmitted data packet to the target base station; or, the source base station forwards the unsuccessfully transmitted data packets in the same data stream to the target base station together. Specifically, the source base station may also indicate a sequence number corresponding to each data packet to the target base station.
Further, after receiving the status report, the target base station determines, according to the status report, an unsuccessfully received data packet, and sends the unsuccessfully received data packet, where the unsuccessfully received data packet is at least a part of the unsuccessfully transmitted data packet. For example, after receiving the status report for the data flow, the target base station may determine that, among the unsuccessfully transmitted data packets with PDCP sequence numbers 21, 22, 23 to 40, the UE has successfully received the data packets with sequence numbers 24, 25, 28, and 29, and the data packets with other sequence numbers UE have unsuccessfully received, that is, the data packets with sequence numbers 21, 22, 23, 26, 27, and 30 to 40 have unsuccessfully received, and then the target base station may retransmit the data packets with other sequence numbers to the UE. Specifically, the target base station may sequentially transmit the data packets that are not received by the UE from the first data packet that is not received by the UE, that is, sequentially transmit the data packets with sequence numbers 21, 22, 23, 26, 27, 30 to 40 from the data packet with sequence number 21.
Preferably, the data transmission method shown in fig. 2 may include step S206: when the data packet sequence number in each data stream is discontinuous, when the unsuccessfully received data packet is received, the receiving window is adjusted according to the data stream information and the data packet sequence number to which the unsuccessfully received data packet belongs.
Specifically, when the target base station sends a data packet that is not successfully received, for each data Flow, the sequence number of the data packet received by the UE may be discontinuous, and at this time, the UE may actively adjust the receive window, avoid waiting for data packets with certain sequence numbers that do not belong to the Flow, and improve communication efficiency. For example, for Flow1, after receiving the packet with sequence number 27, the UE may know that the packet with sequence number 28 belongs to Flow2, the packet with sequence number 29 has been received, and the next received packet is the packet with sequence number 31 according to the data Flow information to which the unsuccessfully received packet belongs, and may adjust the receive window to receive the packet with sequence number 31, so as to avoid waiting for the packet with sequence number 28 and the packet with sequence number 29.
Preferably, when the target base station transmits the unsuccessfully received data packet or the new data packet, in each data stream, after the successfully received data packet with the maximum sequence number, the data packets after the data packet with the maximum sequence number are transmitted in sequence; or, when the target base station sends the unsuccessfully received data packet or the new data packet, in the unsuccessfully transmitted data packet, after the successfully received data packet with the maximum sequence number, sequentially transmitting the data packets after the data packet with the maximum sequence number.
Specifically, when transmitting an unsuccessfully received packet, the target base station may transmit, after the packet with the maximum sequence number of the local Flow (or DRB) that has been received by the UE, the packets following the packet with the maximum sequence number in order. For example, the target base station maps Flow1 and Flow2 to DRB1 and DRB2, respectively; for Flow1, if the packet with the largest sequence number successfully received by the UE is the packet with sequence number 29, the target base station encodes the packet with the original sequence number 31 as 30, encodes the packet with the original sequence number 33 as 31, and transmits the packet, and so on, i.e., resumes the sequential transmission.
Alternatively, when the target base station transmits the unsuccessfully received data packet, the target base station may transmit the data packets after the data packet with the maximum sequence number in sequence after the data packet with the maximum sequence number that has been received by the UE (i.e., the data packet with the maximum sequence number in the DRB received by the UE). For example, if the packets with the largest sequence numbers of Flow1 and Flow2 (both mapped to DRB1 of the target base station) in DRB1 successfully received before the UE handover are packets with sequence number 39, the target base station performs in-sequence transmission after the packets with sequence number 39 when sending the packets with Flow1 (mapped to DRB1) and Flow2 (mapped to DRB2), that is, the packets after the Flow are transmitted with sequence number 40, and so on, to resume in-sequence transmission.
Fig. 3 is a flowchart of another data transmission method according to an embodiment of the present invention.
The data transmission method shown in fig. 3 may include the steps of:
step S301: after the switching completion signaling is sent, receiving data stream information which is sent by a target base station and to which the unsuccessfully transmitted data packet belongs, wherein a source base station is a base station before switching, and the target base station is a base station after switching;
in specific implementation, the first mapping relationship between the data stream and the data radio bearer after the handover is sent to the UE through the source base station. Specifically, the user equipment may receive the first mapping relationship together when receiving a handover command transmitted by the source base station.
Step S302: generating a status report aiming at the data flow according to the data flow information of the unsuccessfully transmitted data packet and the receiving status of the unsuccessfully transmitted data packet;
step S303: determining a data radio bearer mapped by the data stream of the unsuccessfully transmitted data packet after switching according to the data stream information to which the unsuccessfully transmitted data packet belongs and the first mapping relation;
step S304: sending the status reports of the data streams mapped in the same data radio bearer to the target base station;
step S305: when the data packet sequence number in each data stream is discontinuous, when the unsuccessfully received data packet is received, the receiving window is adjusted according to the data stream information and the data packet sequence number to which the unsuccessfully received data packet belongs.
In a specific implementation, in step S301, the ue may receive, after accessing the target base station, that is, after sending the handover completion signaling, data flow information to which the unsuccessfully transmitted data packet sent by the target base station belongs. I.e. the sequence number of the data packet corresponding to each data stream is sent to the user equipment.
Specifically, after receiving the data flow information to which the unsuccessfully transmitted data packet belongs, the UE sets a status report for the data flow according to the reception status of the data packet received at the source base station. The status report for each data stream is then sent to the target base station.
It should be understood by those skilled in the art that the status report may be set with a PDCP sequence number, and therefore may be referred to as a PDCP status report, or may be any other practicable name, and the embodiment of the present invention is not limited thereto. For example, a newly introduced layer 2 may be merged with PDCP and the status report name may be changed accordingly.
More details of the specific implementation of step S302 to step S305 may refer to the related descriptions in step S203 to step S206 shown in fig. 2, and are not described herein again.
Preferably, when the source base station sends the handover request to the target base station, the second mapping relationship between the data stream before handover and the data radio bearer is explicitly indicated. In other words, the target base station already knows the second mapping relationship between the data flow and the data radio bearer before the handover before receiving the status report. The source base station may send the second mapping relationship to the target base station through the handover request. The target base station can directly acquire the second mapping relationship from the handover request without other analysis operations, thereby ensuring that the target base station can accurately receive the second mapping relationship.
Specifically, the radio parameters configured for the UE by the base station side are all located in a container of one access stratum, and the Xn interface between the base stations does not need to understand the radio parameters. If the source base station puts the second mapping relationship into the container, in the handover process, the target base station needs to analyze the radio parameters in the container through an RRC protocol, and then knows the mapping relationship from the Flow of the source base station side to the DRB, so that the target base station cannot quickly identify the mapping relationship from the Flow of the source base station side to the DRB when receiving the handover request response. Further, when the source base station and the target base station belong to different protocol versions, the target base station may not be able to identify the Flow-to-DRB mapping relationship on the source base station side when receiving the handover request sent by the source base station. Therefore, the source base station may explicitly indicate the mapping relationship (i.e., the second mapping relationship) of Flow to DRB in the handover request. I.e. the second mapping is not placed in the container of the access stratum.
More working principles and more contents of working modes of the embodiment of the present invention may refer to the related descriptions in fig. 1 to fig. 2, and are not described herein again.
Fig. 4 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention.
The data transmission apparatus 40 in this embodiment may be used on the user equipment side.
The data transmission apparatus 40 shown in fig. 4 may include a data flow information receiving module 401 and a status report sending module 402.
The data flow information receiving module 401 is adapted to receive data flow information to which a data packet that is not successfully transmitted belongs when a cell is handed over or after the cell is handed over.
The status report sending module 402 is adapted to generate a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and send the status report to the target base station.
In a specific implementation, the data flow information receiving module 401 receives data flow information to which a data packet that is not successfully transmitted belongs when a cell is switched or after the cell is switched. For example, the PDCP sequence numbers (sequence numbers) corresponding to the unsuccessfully transmitted packets are 21, 22, and 23 to 40, respectively, where the Flow information of the packet with the odd sequence number is Flow1, and the Flow information of the packet with the even sequence number is Flow 2.
Further, the data flow information to which the unsuccessfully transmitted data packet belongs may be transmitted by the source base station, or may be transmitted by the target base station.
Further, the unsuccessfully transmitted data packet may include a data packet that is not sent by the source base station and a data packet that is sent by the source base station and has not received acknowledgement feedback.
In a specific implementation, the status report sending module 402 sends the status report for the data flow to the target base station. The target base station can judge whether the data packets are really received or not received by the user equipment according to the state report aiming at the data stream, and then the data packets which are not received are sent to the user equipment again, so that the loss of the data packets is avoided.
According to the embodiment of the invention, the user equipment can generate a state report aiming at the data flow according to the data flow information to which the data packet which is not successfully transmitted belongs and send the state report to the target base station; therefore, the switched target base station can know the state of actually receiving the data packet by the user equipment, and further can accurately send the data packet which is not received by the user equipment to the user equipment in the subsequent steps, so that the lossless transmission of data during switching is realized, the loss of the data packet is avoided, and the user experience is improved.
For more details of the operation principle and the operation mode of the data transmission device 40, reference may be made to the relevant descriptions in fig. 1 to fig. 3, which are not described herein again.
In order to ensure the lossless transmission of the data, the embodiment of the invention also discloses a data transmission method. The data transmission method can be used for the target base station side.
The data transmission method may include the steps of:
when receiving a switching request, acquiring a second mapping relation between a data stream before switching and a data radio bearer; after receiving a switching completion signaling sent by user equipment, receiving a status report of unsuccessfully transmitted data packets sent by the user equipment; and determining the receiving state of the unsuccessfully transmitted data packet according to the first mapping relation, the second mapping relation and the state report of the switched data stream and data radio bearer.
In this embodiment, the target base station may determine the actual receiving state of the unsuccessfully transmitted data packet by the user terminal according to the first mapping relationship, the second mapping relationship and the status report, so that the data packet which is not received by the user equipment may be accurately sent to the user equipment in the subsequent steps, thereby avoiding the loss of the data packet and ensuring the lossless transmission of the data.
Preferably, the data transmission method further includes: determining unsuccessfully received data packets according to the receiving state, wherein the unsuccessfully received data packets are at least one part of the unsuccessfully transmitted data packets; and sending the unsuccessfully received data packet to the user equipment.
In this embodiment, the UE may set a status report according to the second mapping relationship between the data stream and the data radio bearer before the handover and the receiving status of the unsuccessfully transmitted data packet, and send the status report to the target base station. After receiving the status report, the target base station determines the receiving status of the unsuccessfully transmitted data packet according to the sequence information of the data packets in the data Flow, for example, for Flow1, the target base station learns that the data packet including the data packet with the singular sequence number, i.e. the data packet with the sequence number of 21, 23, 25, 27, 29, 31 belongs to Flow1, and meanwhile, the data packet with the sequence number of 25 and 29 has been successfully received, and the data packet with the sequence number of 21, 23, 27, 31 has not been successfully received.
In a specific implementation, after receiving the handover request response, the source base station may forward the untransmitted data packet to the target base station. The source base station can uniformly forward the data packets to the target base station, and also can forward the data packets which are not successfully transmitted to the target base station respectively according to the data streams, and simultaneously indicate the sequence numbers corresponding to the data packets to the target base station.
Further, the target base station may notify the user equipment of the packet sequence number in each data stream. I.e. the UE is informed that the packet with sequence number 21, 23, 25, 27, 29, 31 belongs to Flow 1. The target base station can also inform the UE that the data packets of the sequence numbers 25 and 29 have been successfully received; or, the target base station may also notify the UE that the data packets of the sequence numbers 21, 23, 27, and 31 are not successfully received at the same time, so that the UE can accurately determine the sequence number of the next received data packet in the Flow during subsequent reception, avoid unnecessary waiting, improve communication efficiency, and improve user experience.
Optionally, the target base station may also notify the user equipment of data flow information to which a data packet before the data packet with the maximum sequence number received by the user equipment belongs, and after the data packet with the maximum sequence number is successfully received, sequentially transmit data packets after the data packet with the maximum sequence number. For example, if the packet with the largest sequence number received by the UE is the packet with sequence number 29, the target base station notifies the UE that the packets with sequence numbers 21, 23, 25, 27, 29 belong to Flow1, and then the target base station will be the packet number of Flow1 in the sequence of sequence numbers 30, 31, 32 no matter what the sequence number of the packet is on the source base station side.
Further, when receiving the handover command, the UE may receive the first mapping relationship together, and determine that the mapping between the data stream and the data radio bearer after the handover changes according to the first mapping relationship, and at this time, the UE may still generate the status report according to the second mapping relationship between the data stream and the data radio bearer before the handover.
It is to be appreciated that the status report can be a PDCP status report.
FIG. 5 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present invention
The data transmission apparatus 50 shown in fig. 5 may include a data stream information receiving module 501, a status report sending module 502, and a receiving window adjusting module 503.
Specifically, the data stream information receiving module 501 may include a first data stream information receiving unit 5011 and a first receiving unit 5012. The first data flow information receiving unit 5011 is adapted to receive, when receiving a handover command sent by a source base station, data flow information to which the unsuccessfully transmitted data packet sent by the source base station belongs, where the source base station is a pre-handover base station and a target base station is a post-handover base station. The first receiving unit 5012 is adapted to receive the first mapping relationship between the data radio bearer and the data stream after the handover when receiving the handover command sent by the source base station.
The data stream information receiving module 501 may further include a second data stream information receiving unit 5013. The second data flow information receiving unit 5013 is adapted to receive data flow information of the unsuccessfully transmitted data packet sent by the target base station after sending the handover complete signaling, where the source base station is a pre-handover base station, and the target base station is a post-handover base station.
Specifically, the status report transmitting module 502 may include a status report generating unit 5021, a data radio bearer determining unit 5022, and a status report transmitting unit 5023.
The status report generating unit 5021 is adapted to generate a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet; the data radio bearer determining unit 5022 is adapted to determine, according to the data flow information to which the unsuccessfully transmitted data packet belongs and the first mapping relationship, a data radio bearer to which the data flow of the unsuccessfully transmitted data packet is mapped after the handover; the status report transmitting unit 5023 is adapted to transmit the status reports mapped to the data flows of the same data radio bearer to the target base station together.
In a specific implementation, the receive window adjusting module 503 is adapted to adjust the receive window according to the data flow information and the packet sequence number to which the unsuccessfully received packet belongs when receiving the unsuccessfully received packet when the packet sequence number in each data flow is discontinuous.
According to the embodiment of the invention, the user equipment can generate a state report aiming at the data flow according to the data flow information to which the data packet which is not successfully transmitted belongs and send the state report to the target base station; therefore, the switched target base station can know the state of actually receiving the data packet by the user equipment, and further can accurately send the data packet which is not received by the user equipment to the user equipment in the subsequent steps, so that the lossless transmission of data during switching is realized, the loss of the data packet is avoided, and the user experience is improved.
For more details of the operation principle and the operation mode of the data transmission device 50, reference may be made to the relevant descriptions in fig. 1 to 4, which are not described herein again.
The embodiment of the invention also discloses user equipment which comprises the data transmission device 40 shown in fig. 4 or the data transmission device 50 shown in fig. 5. The data transmission device 40 or the data transmission device 50 may be internally integrated with or externally coupled to the user equipment, and the user equipment may perform data transmission before and after cell handover. The users include but are not limited to mobile phones, tablet computers and computers.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (23)
1. A data transmission method is applied to user equipment, and is characterized by comprising the following steps:
receiving data stream information to which a data packet which is not successfully transmitted belongs when a cell is switched or after the cell is switched;
generating a status report aiming at the data stream according to the data stream information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to a target base station;
the receiving of the data flow information to which the unsuccessfully transmitted data packet belongs includes: when receiving a switching command sent by a source base station, receiving data stream information to which the unsuccessfully transmitted data packet sent by the source base station belongs, wherein the source base station is a base station before switching, and a target base station is a base station after switching;
or, the receiving the data flow information to which the unsuccessfully transmitted data packet belongs includes: after the switching completion signaling is sent, receiving data stream information which is sent by a target base station and to which the unsuccessfully transmitted data packet belongs, wherein a source base station is a base station before switching, and the target base station is a base station after switching;
the method further comprises the following steps: and when receiving the switching command sent by the source base station, receiving a first mapping relation between the switched data stream and the data radio bearer.
2. The data transmission method according to claim 1, wherein the source base station receives the first mapping relationship between the data stream after handover and the data radio bearer sent by the target base station when receiving the handover request response sent by the target base station.
3. The data transmission method according to claim 2, wherein the target base station explicitly indicates the first mapping relationship in the handover request response.
4. The data transmission method according to claim 1, wherein the generating a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to a target base station comprises:
generating a status report aiming at the data flow according to the data flow information of the unsuccessfully transmitted data packet and the receiving status of the unsuccessfully transmitted data packet;
determining a data radio bearer to which the data stream of the unsuccessfully transmitted data packet is mapped after switching according to the data stream information to which the unsuccessfully transmitted data packet belongs and a first mapping relation, wherein the first mapping relation comprises the mapping relation between the data stream after switching and the data radio bearer;
and sending the status reports of the data streams mapped in the same data radio bearer to the target base station.
5. The data transmission method according to claim 1, wherein the source base station forwards the unsuccessfully transmitted data packet to the target base station after receiving the handover request response sent by the target base station.
6. The data transmission method according to claim 5, wherein the source base station forwards the unsuccessfully transmitted data packet to the target base station together;
or, the source base station forwards the unsuccessfully transmitted data packet in the same data stream to the target base station according to the data stream.
7. The data transmission method according to claim 5, wherein the target base station determines, after receiving the status report, unsuccessfully received data packets according to the status report, and transmits the unsuccessfully received data packets, where the unsuccessfully received data packets are at least a part of the unsuccessfully transmitted data packets.
8. The data transmission method according to claim 7, further comprising:
and if the data packet sequence number in each data stream is discontinuous, when the unsuccessfully received data packet is received, adjusting a receiving window according to the data stream information and the data packet sequence number to which the unsuccessfully received data packet belongs.
9. The data transmission method according to claim 7, wherein when the target base station transmits the unsuccessfully received data packet or a new data packet, in each data flow, after the successfully received data packet with the maximum sequence number, the data packets after the data packet with the maximum sequence number are transmitted in sequence;
or, when the target base station sends the unsuccessfully received data packet or the new data packet, in the unsuccessfully transmitted data packet, after the successfully received data packet with the maximum sequence number, sequentially transmitting the data packets after the data packet with the maximum sequence number.
10. The data transmission method according to claim 1, wherein the source base station explicitly indicates the second mapping relationship between the data stream and the data radio bearer before the handover when sending the handover request to the target base station.
11. The data transmission method according to claim 1, wherein the unsuccessfully transmitted data packets include data packets which are not sent by the source base station and data packets which are sent by the source base station and have not received acknowledgement feedback.
12. A data transmission apparatus for a user equipment, comprising:
the data flow information receiving module is suitable for receiving the data flow information to which the unsuccessfully transmitted data packet belongs when the cell is switched or after the cell is switched;
the status report sending module is suitable for generating a status report aiming at the data flow according to the data flow information of the unsuccessfully transmitted data packet and the receiving status of the unsuccessfully transmitted data packet, and sending the status report to the target base station;
the data stream information receiving module comprises: a first data flow information receiving unit, adapted to receive data flow information to which the unsuccessfully transmitted data packet sent by a source base station belongs when receiving a handover command sent by the source base station, where the source base station is a pre-handover base station and a target base station is a post-handover base station;
or, the data stream information receiving module includes: a second data flow information receiving unit, adapted to receive data flow information to which the unsuccessfully transmitted data packet sent by the target base station belongs after sending the handover completion signaling, where the source base station is a pre-handover base station, and the target base station is a post-handover base station;
the data stream information receiving module further comprises: and a first receiving unit, adapted to receive a first mapping relationship between a switched data stream and a data radio bearer when receiving the handover command sent by the source base station.
13. The data transmission apparatus according to claim 12, wherein the source base station receives the first mapping relationship between the data radio bearer and the data stream after handover transmitted by the target base station when receiving the handover request response transmitted by the target base station.
14. The data transmission apparatus of claim 13, wherein the target base station explicitly indicates the first mapping relationship in the handover request response.
15. The data transmission apparatus of claim 12, wherein the status report sending module comprises:
a status report generating unit, adapted to generate a status report for a data flow according to the data flow information to which the unsuccessfully transmitted data packet belongs and the receiving status of the unsuccessfully transmitted data packet;
a data radio bearer determining unit, adapted to determine, according to data flow information to which the unsuccessfully transmitted data packet belongs and a first mapping relationship, a data radio bearer to which a data flow of the unsuccessfully transmitted data packet is mapped after the handover, where the first mapping relationship includes a mapping relationship between the data flow after the handover and the data radio bearer;
and the status report sending unit is suitable for sending the status reports of the data flows mapped in the same data radio bearer to the target base station together.
16. The data transmission apparatus according to claim 12, wherein the source base station forwards the unsuccessfully transmitted data packet to the target base station after receiving the handover request response sent by the target base station.
17. The data transmission apparatus according to claim 16, wherein the source base station forwards the unsuccessfully transmitted data packet to the target base station together;
or, the source base station forwards the unsuccessfully transmitted data packets in the same data stream to the target base station together.
18. The data transmission apparatus according to claim 16, wherein the target base station determines, after receiving the status report, unsuccessfully received data packets according to the status report, and transmits the unsuccessfully received data packets, where the unsuccessfully received data packets are at least a part of the unsuccessfully transmitted data packets.
19. The data transmission apparatus of claim 18, further comprising:
and the receiving window adjusting module is suitable for adjusting a receiving window according to the data flow information and the data packet sequence number of the unsuccessfully received data packet when the unsuccessfully received data packet is received if the data packet sequence number in each data flow is discontinuous.
20. The data transmission apparatus according to claim 18, wherein when the target base station transmits the unsuccessfully received data packet or a new data packet, in each data flow, after the successfully received data packet with the maximum sequence number, the data packets after the data packet with the maximum sequence number are transmitted in sequence;
or, when the target base station sends the unsuccessfully received data packet or the new data packet, in the unsuccessfully transmitted data packet, after the successfully received data packet with the maximum sequence number, sequentially transmitting the data packets after the data packet with the maximum sequence number.
21. The data transmission apparatus of claim 12, wherein the source base station explicitly indicates the second mapping relationship between the data flow and the data radio bearer before the handover when sending the handover request to the target base station.
22. The data transmission apparatus according to claim 12, wherein the unsuccessfully transmitted data packets include data packets that are not sent by the source base station and data packets that are sent by the source base station and have not received acknowledgement feedback.
23. A user equipment comprising a data transmission arrangement according to any one of claims 12 to 22.
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| CN201910797936.4A CN110519814A (en) | 2017-03-23 | 2017-03-23 | Data transmission method and device, storage medium, base station |
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| CN113055425B (en) * | 2019-12-27 | 2022-04-05 | 大唐移动通信设备有限公司 | Data transmission method and device |
| WO2021155584A1 (en) * | 2020-02-07 | 2021-08-12 | Oppo广东移动通信有限公司 | Communication mode switching method and apparatus, and device |
| CN115843064A (en) * | 2021-09-18 | 2023-03-24 | 展讯通信（上海）有限公司 | Data transmission method, communication device, chip and module equipment thereof |
| WO2024152160A1 (en) * | 2023-01-16 | 2024-07-25 | 北京小米移动软件有限公司 | Information feedback method and apparatus |
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| CN108632933A (en) | 2018-10-09 |
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