CN103888215B - Data transmission method, device and communication system - Google Patents
Data transmission method, device and communication system Download PDFInfo
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- CN103888215B CN103888215B CN201210563440.9A CN201210563440A CN103888215B CN 103888215 B CN103888215 B CN 103888215B CN 201210563440 A CN201210563440 A CN 201210563440A CN 103888215 B CN103888215 B CN 103888215B
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- 238000012545 processing Methods 0.000 claims description 20
- 238000009826 distribution Methods 0.000 claims description 2
- 238000012790 confirmation Methods 0.000 abstract description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1864—ARQ related signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L2001/125—Arrangements for preventing errors in the return channel
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Abstract
The present invention relates to communication technical field, discloses a kind of data transmission method, and methods described includes step：Source base station transmits Sequence Number SN state transfers message to target BS, is included in the SN state transfers message and is used to represent that the source base station does not receive SN information corresponding to the PDCP PDCP protocol Data Unit PDU bags for confirming character ACK feedbacks.Present invention also offers a kind of device for data transfer, and communication system.The present invention is transmitted to include in message by the serial-number-state sent in source base station to be used to represent that the source base station does not receive sequence number information corresponding to confirmation PDCP PDU bags, so that after source eNB carries out data forwarding, the PDCP SDU bags that can ensure to have been allocated for sequence number in source eNB can also be assigned to identical sequence number on target eNB, so as to ensure the continuity of PDCP SDU bags.
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 communication system.
Background
A handover procedure between Evolved node bs (enbs) in an existing Long Term Evolution (Long Term Evolution, LTE) system is shown in fig. 1. In the flow of fig. 1, in an Unacknowledged Mode (UM), when a User Equipment (UE) is handed over from a source eNB to a target eNB, an IP Packet buffered by the source eNB may be forwarded to the target eNB through an X2 interface, or may not be forwarded to the target eNB, and when the target eNB performs Packet Data Convergence Protocol (PDCP) layer processing on Data in a buffer, the procedure is restarted from a PDCP Sequence Number (SN) = 0. In the Acknowledged Mode (AM), in order to ensure the continuity of data packets during handover, two types of data need to be forwarded on a communication interface (X2) between eNode bs, one is an IP packet that is not processed by the PDCP layer, i.e., a PDCP Service Data Unit (SDU) packet, and the other is a PDCP Protocol Data Unit (PDU) packet that does not receive Acknowledgement Character (ACK) feedback. The ACK is fed back by the user equipment in uplink and by the base station in downlink.
A Relay architecture (referred to as ALT-4) is proposed in 3GPP TR 36.806. The protocol stacks for the control plane and the user plane of ALT-4 are shown in fig. 2 and 3. For the User plane of the ALT-4 architecture, the data of the communication interface (Un) between the relay node and the eNB does not need to be processed by the IP, the User data packet Protocol (UDP), the gprs tunnel Protocol (gprs) -User plane layer, but only needs to be processed by the PDCP layer, thereby shortening the processing delay of data transmission. However, when using ALT-4, due to the absence of the Transport Network Layer (TNL), when data forwarding is performed, the target eNB cannot distinguish which data packets received from the X2 interface are PDCP sdu packets that have not been processed by the PDCP Layer, and which data packets are PDCP PDU packets that have not been processed by the PDCP Layer and received ACK feedback, which may cause disorder of the forwarded data when the target eNB performs SN association.
Disclosure of Invention
Embodiments of the present invention provide a data transmission method, an apparatus, and a communication system, so that after a source eNB forwards data, it can be ensured that a PDCP SDU packet to which a sequence number SN has been assigned by the source eNB can also be assigned to a same SN on a target eNB, thereby ensuring continuity of the PDCP SDU packet.
In order to solve the technical problem, the embodiment of the invention discloses the following technical scheme:
in a first aspect, a data transmission method is provided, the method including the steps of: and the source base station sends a serial number SN state transmission message to the target base station, wherein the SN state transmission message comprises SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet used for indicating that the source base station does not receive acknowledgement character ACK feedback.
In a first possible implementation manner of the first aspect, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number.
The PDCP PDU packet also comprises a field F used for indicating whether SN information corresponding to the PDCP PDU packet which does not receive ACK feedback needs to be transmitted or not.
The PDCP PDU packet also comprises a field for counting the PDCP PDU packets which are not fed back by the ACK received by the source base station.
In a second possible implementation manner of the first aspect, the SN status transmission message is a PDCP SN status report, where the PDCP SN status report includes SN information corresponding to a PDCP PDU packet that the source base station does not receive ACK feedback.
The method further comprises the steps of: and the source base station forwards data according to the following sequence: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to the target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station.
The method is applied to a relay architecture defined by a 3GPP TR36.806 protocol.
In a second aspect, a data transmission method is provided, the method comprising the steps of: a target base station receives a Serial Number (SN) state transmission message from a source base station, wherein the SN state transmission message comprises SN information corresponding to a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU) packet which is used for indicating that the source base station does not receive Acknowledgement Character (ACK) feedback;
and the target base station distributes a sequence number for the received PDCP service data unit SDU packet according to the SN information.
In a first possible implementation manner of the second aspect, the SN information is a field PDCP PDU number.
The PDCP PDU packet also comprises a field F used for indicating whether SN information corresponding to the PDCP PDU packet which does not receive ACK feedback needs to be transmitted or not.
The PDCP PDU packet also comprises a field for counting the PDCP PDU packets which are not fed back by the ACK received by the source base station.
In a second possible implementation manner of the second aspect, the SN status transmission message is a PDCP SN status report, where the PDCP SN status report includes SN information corresponding to a PDCP PDU packet that the source base station does not receive ACK feedback.
Before or after the target base station distributes the sequence number for the received PDCP SDU packet according to the SN information, the method also comprises the following steps: the target base station performs PDCP layer processing on the data forwarded by the source base station according to the following sequence: firstly, the PDCP PDU packet which is forwarded by the source base station and does not receive ACK feedback is processed, and then the PDCP PDU packet forwarded by the source base station is processed.
The method is applied to a relay architecture defined by a 3GPP TR36.806 protocol.
In a third aspect, an apparatus for data transmission is provided, the apparatus comprising: and the sending unit is used for sending an SN state transmission message, wherein the SN state transmission message contains SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet which is used for indicating that the source base station does not receive the ACK feedback.
In a first possible implementation manner of the third aspect, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number; or
The SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to PDCP PDU packets which are not fed back by the source base station and receive ACK.
In a second possible implementation manner of the third aspect, the apparatus further includes a forwarding unit, where the forwarding unit is configured to forward data according to the following sequence: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to the target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station.
In a fourth aspect, an apparatus for data transmission is provided, the apparatus comprising: a receiving unit, configured to receive an SN status transmission message sent by a source base station, where the SN status transmission message includes SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet indicating that the source base station does not receive acknowledgement character ACK feedback;
and the distribution unit is used for distributing a sequence number for the received PDCP service data unit SDU packet according to the SN information.
In a first possible implementation manner of the fourth aspect, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number; or
The SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to PDCP PDU packets which are not fed back by the source base station and receive ACK.
In a second possible implementation manner of the fourth aspect, the apparatus further includes a processing unit, configured to perform PDCP layer processing on data forwarded by the source base station according to the following sequence before or after the allocating unit allocates a sequence number to a received PDCP service data unit SDU packet according to the SN information: firstly, the PDCP PDU packet forwarded by the source base station and not receiving ACK feedback is processed, and then the PDCP SDU packet forwarded by the source base station is processed.
In a fifth aspect, a communication system for data transmission is provided, the communication system comprising the apparatus of any of the possible implementations of the third aspect and the apparatus of any of the possible implementations of the fourth aspect.
In a sixth aspect, a system for data transmission is provided, the system comprising: and the network interface is used for sending an SN state transmission message, wherein the SN state transmission message contains SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet used for indicating that the source base station does not receive the ACK feedback.
In a first possible implementation manner of the sixth aspect, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number; or
The SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to PDCP PDU packets which are not fed back by the source base station and receive ACK.
In a second possible implementation manner of the sixth aspect, the system further includes a processor, and the processor is configured to perform data forwarding according to the following sequence: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to the target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station.
In a seventh aspect, a system for data transmission is provided, the system comprising: the network interface is used for receiving SN state transmission information sent by a source base station, wherein the SN state transmission information comprises SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet used for indicating that the source base station does not receive acknowledgement character ACK feedback;
and the controller is used for distributing a sequence number for the received PDCP service data unit SDU packet according to the SN information.
In a first possible implementation manner of the seventh aspect, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number; or
The SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to PDCP PDU packets which are not fed back by the source base station and receive ACK.
The system further includes a processor, configured to perform PDCP layer processing on data forwarded by the source base station according to the following sequence before or after the controller allocates a sequence number to a received PDCP service data unit SDU packet according to the SN information: firstly, the PDCP PDU packet forwarded by the source base station and not receiving ACK feedback is processed, and then the PDCP SDU packet forwarded by the source base station is processed.
The technical scheme has the following advantages: according to the invention, the SN information corresponding to the PDCP PDU packet which is used for indicating that the source base station does not receive the confirmation is included in the SN state transmission message sent by the source base station, so that after the source eNB carries out data forwarding, the PDCP SDU packet which is already distributed with the SN by the source eNB can be ensured to be distributed with the same SN on the target eNB, thereby ensuring the continuity of the PDCP SDU packet.
Drawings
Fig. 1 is a flowchart of handover between enbs in a conventional LTE system;
FIG. 2 is an ALT-4 control plane protocol stack;
FIG. 3 is an ALT-4 username protocol stack;
FIG. 4 is a diagram illustrating a packet format of a conventional PDCP PDU;
FIG. 5 is a diagram illustrating a packet format of a PDCP PDU used in an embodiment of the method of the present invention;
FIG. 6 is a block diagram of one embodiment of an apparatus for data transmission of the present invention;
FIG. 7 is a block diagram of another embodiment of an apparatus for data transmission of the present invention;
FIG. 8 is a block diagram of one embodiment of a communication system of the present invention;
FIG. 9 is a block diagram of one embodiment of a system for data transmission of the present invention;
fig. 10 is a block diagram of another embodiment of a system for data transmission of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
First, a handover method between enbs in an existing LTE system is described by taking an LTE system using an ALT-4 architecture as an example, and a flowchart thereof is shown in fig. 1. In fig. 1, UE represents user equipment, MME represents a mobility management entity, SGW represents a serving gateway, and MME and SGW are network entities involved in the entire handover procedure. The whole switching process comprises 18 steps, including a control plane process and a user plane process, wherein the control plane switching process comprises a switching preparation process, a switching execution process and a switching completion process, and the user plane process comprises data forwarding and the like.
As shown in fig. 1, the data transmission method of the present invention is mainly improved for the SN status transmission message sent in step 8, so that after the UE confirms that the handover is successful (step 11), the target base station (eNB in this embodiment) does not generate a disorder when receiving data from the source base station (eNB in this embodiment).
The first embodiment of the data transmission method of the present invention describes the data transmission process of step 8 in fig. 1 from the source base station side, and the method includes the steps of: the method comprises the steps that a source base station sends a serial number SN state transmission message to a target base station, wherein the SN state transmission message comprises SN information corresponding to a PDCP PDU packet (the PDCP PDU packet refers to a data packet processed by a PDCP layer) which is used for indicating that the source base station does not receive acknowledgement character ACK feedback. The SN state transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDUnumber.
Since data is transmitted between the source eNB and the target base station through the Relay Node (RN) under the ALT-4 architecture, a GTP (GPRS tunneling protocol) layer does not exist between the RN and the target eNB, and only a PDCP layer is present. In order to let the target eNB know which PDCP PDU packets that the source base station has not received the ACK feedback and which PDCP PDU packets that the source base station has received the ACK feedback in the RN retransmission data packets, a field needs to be added in the existing PDCP PDU packet format to indicate that the source base station has not received SN information corresponding to the PDCP PDU packets that the ACK feedback.
The original PDCP PDU packet format is shown in fig. 4, D/C indicates whether the PDCP PDU packet is a Data plane packet or a control plane packet, R is a reserved field, PDCP SN is a sequence number generated by a PDCP layer at an Un interface when the PDCP PDU packet is transmitted through an interface Un between an RN and a target eNB, which is used to ensure the correctness of the sequence number of the PDCP PDU packet transmitted by the Un interface, PDCP SN (cont) is a count value of the transmitted PDCP PDU packet, Data and an ellipsis number are PDCP PDU packet Data parts, Oct indicates an octal.
The modified PDCP PDU packet format is shown in fig. 5, wherein R, which was originally a reserved field, is modified to be an F field: and the 1bit is occupied for indicating whether SN information corresponding to the PDCP PDU packet which is not received by the source base station at the Un interface and fed back by the ACK needs to be transmitted or not. Namely: when the F field is a value of 0, the SN information corresponding to the PDCP PDU packet which does not need to transmit the ACK feedback yet and is not received by the source base station at the Un interface is represented; when the value is 1, the SN information corresponding to the PDCP PDU packet which needs to be transmitted and the ACK feedback of the source base station is not received at the Un interface; the newly added PDCP PDU number field: and occupying 12 bits, which indicates that the source base station does not receive SN information corresponding to the PDCP PDU packet fed back by the ACK. In fig. 5, the newly added PDCP PDU number (cont) is used for the PDCP PDU packet count value that the source base station does not receive ACK feedback, and the ellipses indicate data. In this case, when F =1, the PDCP PDU number of 12 bits is read, so that the sequence number of the PDCP PDU packet that has not received the ACK feedback by the source base station can be obtained, and since the priority of the transmission sequence of the PDCP PDU packet that has not received the ACK feedback is higher than that of the PDCP SDU packet, the sequence number of the PDCP SDU packet received later can be assigned according to the sequence number in the PDCP PDU packet received first, thereby ensuring the continuity of the PDCP SDU packet.
For example: the source node sends data packets 1, 2, 3, 4, 5, wherein the data packets 4, 5 are PDCP SDU packets, and after sending the data packets 1, 2, 3, the source node receives ACK feedback of the PDCP PDU packets 1, 2, but does not receive ACK feedback of the PDCP PDU packet 3. At this time, the source node needs to resend the data packets 3, 4 and 5 to the target node according to the sequence of the data packets 3, 4 and 5 or 3, 5 and 4, and since the PDCP PDU packet indicates SN =3 of the PDCP PDU packet, after the target node receives the PDCP PDU packet, the target node assigns sequence numbers 4 and 5 to the PDCP SDU packet according to the sequence of the received PDCP SDU packet, thereby ensuring the continuity of the PDCP SDU packet.
The second embodiment of the data transmission method of the present invention describes the data transmission process of step 8 in fig. 1 from the target base station side, and the method includes the steps of: a target base station receives a Serial Number (SN) state transmission message from a source base station, wherein the SN state transmission message comprises SN information corresponding to a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU) packet which is used for indicating that the source base station does not receive Acknowledgement Character (ACK) feedback;
and the target base station distributes a sequence number for the received PDCP service data unit SDU packet according to the SN information.
After introducing the ALT-4 relay architecture, because the PDCP SDU packet cannot carry the SN information corresponding to the PDCP SDU packet when being forwarded on the Un interface, the PDCP SN status report transmitted by the downlink X2 interface after introducing the ALT-4 relay architecture instead contains the SN information corresponding to the PDCP PDU packet which has not received ACK feedback. The PDCP SDU packet is not processed by the PDCP layer, and has no sequence number assigned, and the sequence number is assigned at the target base station, and when it is transmitted, its priority is the lowest, and the PDCP PDU packet processed by the PDCP layer that has not received the ACK feedback has a higher priority, so the data forwarding mechanism of the source base station is: the source base station firstly forwards the PDCP PDU packet which does not receive ACK feedback, and then forwards the PDCP PDU packet. Then the target base station can ensure that the PDCP SDU packet which is distributed with the sequence number on the source base station can be distributed with the same sequence number on the target base station by using the SN information transmitted in the PDCP NS status report, thereby ensuring the continuity of the PDCP SDU packet and carrying out PDCP layer processing on a Un interface on the forwarded PDCP SDU data in sequence.
For example: the source node sends data packets 1, 2, 3, 4, 5, wherein the data packets 4, 5 are PDCP SDU packets, and after sending the data packets 1, 2, 3, the source node receives ACK feedback of the PDCP PDU packets 1, 2, but does not receive ACK feedback of the PDCP PDU packet 3. At this time, the source node needs to resend the data packets 3, 4, and 5 to the target node according to the sequence of the data packets 3, 4, and 5 or 3, 5, and 4, and since the PDCP SN status report indicates SN =3 of the PDCP PDU packet, after the target node receives the PDCP PDU packet, the target node assigns sequence numbers 4 and 5 to the PDCP PDU packet according to the sequence of the received PDCP PDU packet, thereby ensuring the continuity of the PDCP SDU packet.
The data transmission method of the invention can be applied to the relay architecture defined by the 3GPP TR36.806 protocol.
The invention also provides an embodiment of a device and a communication system for data transmission, which correspond to the embodiment of the data transmission method.
Referring to fig. 6, a block diagram of an embodiment of the apparatus for data transmission according to the present invention is shown, which describes a data transmission process from a source base station side.
The device includes: a sending unit 610, configured to send an SN status transmission message, where the SN status transmission message includes SN information corresponding to a PDCP PDU packet that indicates that the source base station does not receive ACK feedback;
a forwarding unit 620, configured to forward data in the following order: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to the target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station.
As an implementation manner, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number.
As another implementation manner, the SN status transmission message is a PDCP SN status report, where the PDCP SN status report includes SN information corresponding to a PDCP PDU packet that the source base station does not receive ACK feedback.
Referring to fig. 7, a block diagram of another embodiment of the apparatus for data transmission according to the present invention is shown, which describes a data transmission process from a target base station side.
The device includes: a receiving unit 710, configured to receive an SN status transmission message sent by a source base station, where the SN status transmission message includes SN information corresponding to a PDCP PDU packet indicating that the source base station does not receive acknowledgement character ACK feedback; and
an allocating unit 720, configured to allocate a sequence number to the received PDCP service data unit SDU packet according to the SN information.
A processing unit 730, configured to, before or after the allocating unit 720 allocates a sequence number to the received PDCP service data unit SDU packet according to the SN information, perform PDCP layer processing on the data forwarded by the source base station according to the following sequence: firstly, the PDCP PDU packet forwarded by the source base station and not receiving ACK feedback is processed, and then the PDCP SDU packet forwarded by the source base station is processed.
As an implementation manner, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number.
As another implementation manner, the SN status transmission message is a PDCP SN status report, where the PDCP SN status report includes SN information corresponding to a PDCP PDU packet that the source base station does not receive ACK feedback.
Referring to fig. 8, a block diagram of an embodiment of a communication system for data transmission according to the present invention is shown.
The communication system includes: any of the embodiments of the apparatus for data transmission 810 described above from the source base station side and any of the embodiments of the apparatus for data transmission 820 described above from the target base station side, for example, the communication system may be an LTE system.
Referring to fig. 9, a block diagram of an embodiment of a system for data transmission according to the present invention is shown.
The system comprises: there is provided a system for data transmission, the system comprising: a network interface 910, configured to send a SN status transmission message, where the SN status transmission message includes SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet that indicates that the source base station does not receive ACK feedback;
a processor 920, wherein the processor 920 is configured to forward data according to the following sequence: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to the target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station.
As an implementation manner, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number.
As another implementation manner, the SN status transmission message is a PDCP SN status report, where the PDCP SN status report includes SN information corresponding to a PDCP PDU packet that the source base station does not receive ACK feedback.
Referring to fig. 10, a block diagram of another embodiment of the system for data transmission of the present invention is shown.
The system comprises: a network interface 1010, configured to receive an SN status transmission message sent by a source base station, where the SN status transmission message includes SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet indicating that the source base station does not receive an ACK feedback;
a controller 1020, configured to assign a sequence number to a received PDCP service data unit SDU packet according to the SN information;
a processor 1030, configured to, before or after the controller 1020 assigns a sequence number to a received PDCP service data unit SDU packet according to the SN information, perform PDCP layer processing on data forwarded by the source base station according to the following sequence: firstly, the PDCP PDU packet forwarded by the source base station and not receiving ACK feedback is processed, and then the PDCP SDU packet forwarded by the source base station is processed.
As an implementation manner, the SN status transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number.
As another implementation manner, the SN status transmission message is a PDCP SN status report, where the PDCP SN status report includes SN information corresponding to a PDCP PDU packet that the source base station does not receive ACK feedback.
It can be seen from the above embodiments that, in the serial number SN status transmission message sent by the source base station, the SN information corresponding to the PDCP PDU packet is included to indicate that the source base station has not received confirmation, so that after the source eNB performs data forwarding, it can be ensured that the PDCP SDU packet to which the sequence number SN has been allocated by the source eNB can also be allocated to the same SN on the target eNB, thereby ensuring the continuity of the PDCP SDU packets.
As will be appreciated by one of ordinary skill in the art, various aspects of the invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Accordingly, aspects of the present invention, or possible implementations of aspects, may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "circuit," module "or" system. Furthermore, aspects of the invention, or possible implementations of aspects, may take the form of a computer program product, which refers to computer-readable program code stored in a computer-readable medium.
The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing, such as Random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, and portable read-only memory (CD-ROM).
A processor in the computer reads the computer-readable program code stored in the computer-readable medium, so that the processor can perform the functional actions specified in each step, or a combination of steps, in the flowcharts; and means for generating a block diagram that implements the functional operation specified in each block or a combination of blocks.
The computer readable program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. It should also be noted that, in some alternative implementations, the functions noted in the flowchart or block diagram block may occur out of the order noted in the figures. For example, two steps or two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. A data transmission method is characterized in that the method is applied to a relay architecture defined by a 3GPP TR36.806 protocol;
the method comprises the following steps: a source base station sends a Serial Number (SN) state transmission message to a target base station, wherein the SN state transmission message comprises SN information corresponding to a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU) packet which is used for indicating that the source base station does not receive Acknowledgement Character (ACK) feedback;
the SN state transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number; the PDCP PDU packet also comprises a field F used for indicating whether SN information corresponding to the PDCP PDU packet which does not receive ACK feedback needs to be transmitted or not; the method further comprises the following steps: the source base station forwards data according to the following sequence: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to the target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station;
or,
the SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to a PDCP PDU packet which is not fed back by the source base station and receives ACK; the method further comprises the following steps: the source base station forwards data according to the following sequence: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to the target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station.
2. The method of claim 1, wherein the PDCP PDU packet further comprises a field for counting a PDCP PDU packet for which the source base station has not received the ACK feedback.
3. A data transmission method is characterized in that the method is applied to a relay architecture defined by a 3GPP TR36.806 protocol;
the method comprises the following steps: a target base station receives a Serial Number (SN) state transmission message from a source base station, wherein the SN state transmission message comprises SN information corresponding to a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU) packet which is used for indicating that the source base station does not receive Acknowledgement Character (ACK) feedback;
the target base station distributes a sequence number for the received PDCP service data unit SDU packet according to the SN information;
wherein, the SN state transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback; the SN information is a field PDCP PDU number, and the PDCP PDU packet also comprises a field F for indicating whether the SN information corresponding to the PDCP PDU packet which does not receive ACK feedback needs to be transmitted or not; before or after the target base station distributes the sequence number for the received PDCP SDU packet according to the SN information, the method also comprises the following steps: the target base station performs PDCP layer processing on the data forwarded by the source base station according to the following sequence: firstly, processing PDCP PDU packets which are forwarded by the source base station and do not receive ACK feedback, and then processing PDCP SDU packets forwarded by the source base station;
or,
the SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to a PDCP PDU packet which is not fed back by the source base station and receives ACK; before or after the target base station allocates the sequence number to the received PDCPSDU packet according to the SN information, the method also comprises the following steps: the target base station performs PDCP layer processing on the data forwarded by the source base station according to the following sequence: firstly, the PDCP PDU packet forwarded by the source base station and not receiving ACK feedback is processed, and then the PDCP SDU packet forwarded by the source base station is processed.
4. The method of claim 3, wherein the PDCP PDU packet further comprises a field for counting a PDCP PDU packet for which the source base station has not received the ACK feedback.
5. An apparatus for data transmission, wherein the apparatus is applied in a relay architecture defined by 3GPP TR36.806 protocol;
the device comprises: a sending unit, configured to send an SN status transmission message, where the SN status transmission message includes SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet indicating that the source base station does not receive acknowledgement character ACK feedback;
the SN state transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number; the PDCP PDU packet also comprises a field F used for indicating whether SN information corresponding to the PDCP PDU packet which does not receive ACK feedback needs to be transmitted or not; when the SN status transmission message is that the source base station does not receive a PDCPPDU packet fed back by an ACK, the apparatus further includes a forwarding unit, where the forwarding unit is configured to forward data according to the following order: firstly, the PDCP PDU packet which does not receive ACK feedback is forwarded to a target base station, and then the PDCP service data unit SDU packet is forwarded to the target base station;
or,
the SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to a PDCP PDU packet which is not fed back by the source base station and receives ACK; when the SN status transmission message is a PDCP SN status report, the forwarding unit is configured to forward data according to the following sequence: firstly, the PDCP PDU packets which do not receive ACK feedback are forwarded to a target base station, and then the PDCP service data unit SDU packets are forwarded to the target base station.
6. An apparatus for data transmission, wherein the apparatus is applied in a relay architecture defined by 3GPP TR36.806 protocol;
the device comprises: a receiving unit, configured to receive an SN status transmission message sent by a source base station, where the SN status transmission message includes SN information corresponding to a packet data convergence protocol PDCP protocol data unit PDU packet indicating that the source base station does not receive acknowledgement character ACK feedback;
the distribution unit is used for distributing a sequence number for the received PDCP service data unit SDU packet according to the SN information;
the SN state transmission message is a PDCP PDU packet that the source base station does not receive ACK feedback, and the SN information is a field PDCP PDU number; the PDCP PDU packet also comprises a field F used for indicating whether SN information corresponding to the PDCP PDU packet which does not receive ACK feedback needs to be transmitted or not; when the SN status transmission message is that the source base station does not receive a PDCP pdu packet fed back by an ACK, the apparatus further includes a processing unit, configured to perform PDCP layer processing on data forwarded by the source base station according to the following sequence before or after the allocating, by the allocating unit, a sequence number to the received PDCP service data unit SDU packet according to the SN information: firstly, processing PDCP PDU packets which are forwarded by the source base station and do not receive ACK feedback, and then processing PDCP SDU packets forwarded by the source base station;
or,
the SN state transmission message is a PDCP SN state report, and the PDCP SN state report contains SN information corresponding to a PDCP PDU packet which is not fed back by the source base station and receives ACK; when the SN status transmission message is a PDCP SN status report, the processing unit is configured to perform PDCP layer processing on data forwarded by the source base station according to the following sequence before or after the allocating unit allocates a sequence number to a received PDCP service data unit SDU packet according to the SN information: firstly, the PDCP PDU packet forwarded by the source base station and not receiving ACK feedback is processed, and then the PDCP SDU packet forwarded by the source base station is processed.
7. A communication system for data transmission, characterized in that the communication system comprises the apparatus of claim 5 and the apparatus of claim 6.
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| CN201210563440.9A CN103888215B (en) | 2012-12-21 | 2012-12-21 | Data transmission method, device and communication system |
| CN201711173414.4A CN107911201B (en) | 2012-12-21 | 2012-12-21 | Data transmission method, device and communication system |
| PCT/CN2013/089763 WO2014094613A1 (en) | 2012-12-21 | 2013-12-18 | Data transmission method and device, and communication system |
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| WO2014094613A1 (en) | 2014-06-26 |
| CN107911201A (en) | 2018-04-13 |
| CN107911201B (en) | 2021-10-15 |
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