CN103888215A - Data transmission method, apparatus and communication system - Google Patents
Data transmission method, apparatus and communication system Download PDFInfo
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- CN103888215A CN103888215A CN201210563440.9A CN201210563440A CN103888215A CN 103888215 A CN103888215 A CN 103888215A CN 201210563440 A CN201210563440 A CN 201210563440A CN 103888215 A CN103888215 A CN 103888215A
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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 invention relates to the technical field of communications, and discloses a data transmission method. The method comprises the following steps: a source base station (eNB) sending a sequence number (SN) state transmission message to a target eNB, the SN state transmission message comprising information indicating that the source eNB does not receive an SN corresponding to a packet data convergence protocol (PDCP) protocol data unit (PDU) packet fed back by an acknowledgement (ACK) character. The invention also provides a data transmission apparatus and communication system. According to the invention, the SN state transmission message sent by the source eNB comprises the information indicating that the source eNB does not receive the SN corresponding to the acknowledgement PDCP PDU packet so that after data forwarding is carried out at the source eNB, it can be ensured that a PDCP service data unit (SDU) packet already distributed with an SN at the source eNB can still be distributed with the same SN at the target eNB, thus the continousity of the PDCP SDU packet can be guaranteed.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of data transmission method, device and communication system.
Background technology
Switching flow in existing Long Term Evolution (Long Term Evolution, LTE) system between evolved Node B (Evolved Node B, eNB) as shown in Figure 1.In the flow process of Fig. 1, Unacknowledged Mode (Unacknowledged Mode, UM) under pattern, subscriber equipment (User Equipment, UE) while being switched to target eNB from source eNB, can be forwarded to target eNB by X2 interface at the IP of source eNB buffer memory bag, also can not be forwarded to target eNB, target eNB is carried out PDCP (Packet Data Convergence Protocol to the data of buffering area, PDCP) when layer is processed, be to restart from PDCP sequence number (Sequence Number, SN)=0.And at affirmation mode (Acknowledged Mode, AM) under pattern, in order to guarantee the continuity of packet in handoff procedure, need to the communication interface (X2) between eNode B above forward the data of two types, the one, do not wrap i.e. PDCP Service Data Unit (Service data unit through the IP of PDCP layer processing, SDU) bag, the 2nd, do not receive that the PDCP protocol Data Unit (Protocol Data Unit, PDU) of acknowledge character (Acknowledgement, ACK) feedback wraps.ACK is fed back by subscriber equipment when up, when descending, is fed back by base station.
A kind of Relay framework (being called ALT-4) has been proposed in 3GPP TR36.806.The protocol stack of the chain of command of ALT-4 and user's face as shown in Figure 2 and Figure 3.For user's face of ALT-4 framework, the data of the communication interface (Un) of via node and eNB do not need to carry out IP, User Datagram Protocol (User Datagram Protocol, UDP), the processing of general packet radio service tunnel agreement-user plane layer, and only need to process PDCP layer, thereby shorten the processing delay of transfer of data.But, in the time adopting ALT-4, due to without transport network layer (Transfer Net Layer, TNL), while carrying out data retransmission, target eNB cannot distinguish which packet of receiving from X2 interface is the PDCPSDU bag through the processing of PDCP layer not, which data be not yet receive ACK feedback, through the PDCP PDU bag of PDCP layer processing, thereby may cause forwarding data to carry out out of order when associated of SN in target eNB.
Summary of the invention
The embodiment of the present invention provides data transmission method, device and communication system, to make after source eNB carries out data retransmission, can guarantee that having distributed the PDCP SDU of sequence number SN to wrap in target eNB at source eNB can also be assigned to identical SN, thereby guarantee the continuity of PDCP SDU bag.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
First aspect, a kind of data transmission method is provided, described method comprises step: source base station transmits Sequence Number SN state transfer message to target BS, comprises for representing that the PDCP PDCP protocol Data Unit PDU that described source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information in described SN state transfer message.
In the possible implementation of the first of first aspect, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number.
In described PDCP PDU bag, also comprise to be used to indicate whether to need to transmit and do not receive that the PDCP PDU of ACK feedback wraps the field F of corresponding SN information.
In described PDCP PDU bag, also comprise the field that is used to source base station not receive the PDCP PDU bag counting of ACK feedback.
In the possible implementation of the second of first aspect, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
Described method also comprises step: carry out in the following order data retransmission at described source base station: first the PDCP PDU bag of not receiving ACK feedback is transmitted to described target BS, and then PDCP Service Data Unit SDU bag is transmitted to described target BS.
Described method is applied in the defined relaying framework of 3GPP TR36.806 agreement.
Second aspect, a kind of data transmission method is provided, described method comprises step: target BS, from source base station receive sequence number SN state transfer message, comprises in described SN state transfer message for representing that the PDCP PDCP protocol Data Unit PDU that described source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information;
Described target BS is according to described SN information, is the PDCP Service Data Unit SDU the receiving sequence number that is responsible for assigning.
In the possible implementation of the first of second aspect, described SN information is field PDCP PDU number.
In described PDCP PDU bag, also comprise to be used to indicate whether to need to transmit and do not receive that the PDCP PDU of ACK feedback wraps the field F of corresponding SN information.
In described PDCP PDU bag, also comprise the field that is used to source base station not receive the PDCP PDU bag counting of ACK feedback.
In the possible implementation of the second of second aspect, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
Described target BS is according to described SN information, for the PDCP SDU receiving is responsible for assigning before sequence number or afterwards, also comprise step: the data that described target BS forwards described source base station are in the following order carried out the processing of PDCP layer: first process the PDCP PDU bag of not receiving ACK feedback that described source base station forwards, then process the PDCP SDU bag that described source base station forwards.
Described method is applied in the defined relaying framework of 3GPP TR36.806 agreement.
The third aspect, a kind of device for transfer of data is provided, described device comprises: transmitting element, be used for sending SN state transfer message, in described SN state transfer message, comprise for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information.
In the possible implementation of the first of the third aspect, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number; Or
Described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
In the possible implementation of the second of the third aspect, described device also comprises retransmission unit, described retransmission unit is for carrying out in the following order data retransmission: first the PDCP PDU bag of not receiving ACK feedback is transmitted to described target BS, and then PDCP Service Data Unit SDU bag is transmitted to described target BS.
Fourth aspect, a kind of device for transfer of data is provided, described device comprises: receiving element, the SN state transfer message sending for reception sources base station, comprises in described SN state transfer message for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information;
Allocation units for according to described SN information, are the PDCP Service Data Unit SDU the receiving sequence number that is responsible for assigning.
In the possible implementation of the first of fourth aspect, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number; Or
Described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
In the possible implementation of the second of fourth aspect, described device also comprises processing unit, be used for described allocation units according to described SN information, for the PDCP Service Data Unit SDU receiving is responsible for assigning before sequence number or afterwards, the data that in the following order described source base station forwarded are carried out the processing of PDCP layer: first process the PDCP PDU bag of not receiving ACK feedback that described source base station forwards, then process the PDCP SDU bag that described source base station forwards.
The 5th aspect, provides a kind of communication system for transfer of data, and described communication system comprises the device of any possible implementation in the above-mentioned third aspect, and the device of any possible implementation in fourth aspect.
The 6th aspect, a kind of system for transfer of data is provided, described system comprises: network interface, be used for sending SN state transfer message, in described SN state transfer message, comprise for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information.
In the possible implementation of the first aspect the 6th, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number; Or
Described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
In the possible implementation of the second aspect the 6th, described system also comprises processor, described processor is for carrying out in the following order data retransmission: first the PDCP PDU bag of not receiving ACK feedback is transmitted to described target BS, and then PDCP Service Data Unit SDU bag is transmitted to described target BS.
The 7th aspect, a kind of system for transfer of data is provided, described system comprises: network interface, the SN state transfer message sending for reception sources base station, comprises in described SN state transfer message for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information;
Controller for according to described SN information, is the PDCP Service Data Unit SDU the receiving sequence number that is responsible for assigning.
In the possible implementation of the first aspect the 7th, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number; Or
Described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
Described system also comprises processor, be used for described controller according to described SN information, for the PDCP Service Data Unit SDU receiving is responsible for assigning before sequence number or afterwards, the data that in the following order described source base station forwarded are carried out the processing of PDCP layer: first process the PDCP PDU bag of not receiving ACK feedback that described source base station forwards, then process the PDCP SDU bag that described source base station forwards.
Technique scheme tool has the following advantages: the present invention confirms that by comprising in the sequence number SN state transfer message sending at source base station for representing that described source base station is not received PDCP PDU wraps corresponding SN information, make after source eNB carries out data retransmission, can guarantee that having distributed the PDCP SDU of sequence number SN to wrap in target eNB at source eNB can also be assigned to identical SN, thereby guarantee the continuity of PDCP SDU bag.
Accompanying drawing explanation
Fig. 1 is the switching flow figure between eNB in existing LTE system;
Fig. 2 is ALT-4 chain of command protocol stack;
Fig. 3 is ALT-4 user name protocol stack;
Fig. 4 is existing PDCP PDU packet format schematic diagram;
Fig. 5 is the PDCP PDU packet format schematic diagram using in an embodiment of method of the present invention;
Fig. 6 is an embodiment block diagram of the device for transfer of data of the present invention;
Fig. 7 is another embodiment block diagram of the device for transfer of data of the present invention;
Fig. 8 is an embodiment block diagram of communication system of the present invention;
Fig. 9 is an embodiment block diagram of the system for transfer of data of the present invention;
Figure 10 is another embodiment block diagram of the system for transfer of data of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
First describe the changing method between eNB in existing LTE system take the LTE system that uses ALT-4 framework as example, its flow chart as shown in Figure 1.In Fig. 1, UE represents subscriber equipment, and MME represents Mobility Management Entity, and SGW represents gateway, and MME and SGW are network entities involved in whole handoff procedure.Whole switching flow comprises 18 steps, comprises control plane process and user plane process, and control plane handoff procedure comprises switching set-up procedure, hand-off execution process and switching complete process, and user plane process comprises data forwarding etc.
As shown in describing in Fig. 1, the sequence number SN state transfer message that data transmission method of the present invention sends mainly for step 8 is wherein improved, make after UE confirms handover success (step 11), target BS (being eNB in the present embodiment) there will not be out of order situation in the time that reception comes from the data of source base station (being eNB in the present embodiment).
The embodiment of first data transmission method of the present invention describes the process of the transfer of data of step 8 Fig. 1 from source base station side, the method comprising the steps of: source base station transmits Sequence Number SN state transfer message to target BS, comprises for representing that the PDCP PDU that described source base station does not receive that acknowledge character ACK feeds back wraps SN information corresponding to (PDCP PDU bag refers to the packet of processing through PDCP layer) in described SN state transfer message.Described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDUnumber.
Due under ALT-4 framework, between source eNB and target BS, by via node (RN) transmission data, between RN and target eNB, there is not GTP(GPRS tunnel protocol) layer, only has PDCP layer.In order to allow target eNB know that in RN retransmission data packet may, which is the PDCP PDU packet that source base station is not received ACK feedback, which is the PDCP PDU packet that source base station has been received ACK feedback, need in existing PDCP PDU packet format, increase a field, be used to indicate source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
Former PDCP PDU packet format as shown in Figure 4, D/C represents that this PDCP PDU bag is the bag of data surface or the bag of chain of command, R is reserved field, when PDCP SN is the interface Un port transmission between PDCP PDU bag process RN and target eNB, the sequence number being produced by PDCP layer at Un mouth, for ensureing that Un interface transmits the correctness of PDCP PDU packet number, PDCPSN(cont.) by the count value of transmission PDCP PDU bag, Data and ellipsis are PDCP PDU bag data division, and Oct represents octal system.
Amended PDCP PDU packet format as shown in Figure 5, wherein, be originally the R of reserved field after revising for F field: whether account for 1bit, being used to indicate needs to transmit source base station and not yet receives that at Un interface the PDCP PDU of ACK feedback wraps corresponding SN information.That is: when F field is 0 value, represent that not needing to transmit source base station not yet receives that at Un interface the PDCP PDU of ACK feedback wraps corresponding SN information; While being 1 value, represent to transmit source base station and not yet receive that at Un interface the PDCP PDU of ACK feedback wraps corresponding SN information; Newly-increased PDCP PDU number field: account for 12bit, represent that the PDCP PDU that source base station does not receive that ACK feeds back wraps corresponding SN information.In Fig. 5, newly-increased PDCP PDU number(cont.) be used to source base station not receive the PDCP PDU bag count value of ACK feedback, ellipsis represents data.In this case, in the time of F=1, the PDCP DPU number that reads 12bit position just can obtain the sequence number that source base station does not receive that the PDCP PDU of ACK feedback wraps, because the sending order priority ratio PDCP SDU of the PDCP PDU bag of not receiving ACK feedback wraps higher, therefore can carry out assignment for the sequence number that the PDCP SDU receiving wraps below according to the sequence number in the PDCPPDU bag first receiving, thereby guarantee the continuity of PDCP SDU bag.
For example: source node will send packet 1,2,3,4,5, wherein packet the 4, the 5th, PDCP SDU bag, sends after packet 1,2,3, receives the ACK feedback of PDCP PDU bag 1,2, but does not receive the ACK feedback of PDCP PDU bag 3.Now source node need to resend packet 3,4,5 to destination node according to the order of packet 3,4,5 or 3,5,4, owing to having indicated the SN=3 of PDCP PDU bag in PDCP PDU bag, after destination node is received PDCP PDU bag, be PDCP SDU bag assignment sequence number 4,5 according to the order of the PDCP SDU bag receiving, thereby guaranteed the continuity of PDCP SDU bag.
The embodiment of second data transmission method of the present invention has described the process of the transfer of data of step 8 Fig. 1 from target BS side, the method comprising the steps of: target BS, from source base station receive sequence number SN state transfer message, comprises in described SN state transfer message for representing that the PDCP PDCP protocol Data Unit PDU that described source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information;
Described target BS is according to described SN information, is the PDCP Service Data Unit SDU the receiving sequence number that is responsible for assigning.
Introduce after ALT-4 relaying framework, owing to forwarding PDCP SDU when bag on Un interface, cannot carry this PDCP SDU and wrap corresponding SN information, the PDCP SN status report of therefore introducing the down link X2 interface transmission after ALT-4 relaying framework changes into comprising not yet receives that the PDCP PDU of ACK feedback wraps corresponding SN information.PDCP SDU bag does not pass through the processing of PDCP layer, there is no distributing serial numbers, its sequence number is to distribute at target BS, and in the time sending, its priority is minimum, and the PDCP PDU packet priority of processing through PDCP layer of not receiving ACK feedback is higher, therefore the data retransmission mechanism of source base station is: first source base station carries out data retransmission by the PDCP PDU bag of not receiving ACK feedback, and then PDCPSDU bag is carried out to data retransmission, due to Un interface adopt be also AM pattern, so the target BS data that reception sources base station forwards according to the order of sequence.Then target BS re-uses PDCP SDU that the SN information of transmitting in PDCPSN status report can guarantee to have distributed sequence number on source base station and wraps on target BS and can also be assigned to identical sequence number, the continuity that has guaranteed PDCPSDU bag, the PDCP SDU data that can also forward by ordered pair are carried out the PDCP layer processing on Un interface.
For example: source node will send packet 1,2,3,4,5, wherein packet the 4, the 5th, PDCP SDU bag, sends after packet 1,2,3, receives the ACK feedback of PDCP PDU bag 1,2, but does not receive the ACK feedback of PDCP PDU bag 3.Now source node need to resend packet 3,4,5 to destination node according to the order of packet 3,4,5 or 3,5,4, owing to having indicated the SN=3 of PDCP PDU bag in PDCP SN status report, after destination node is received PDCP PDU bag, be PDCPSDU bag assignment sequence number 4,5 according to the order of the PDCP SDU bag receiving, thereby guaranteed the continuity of PDCP SDU bag.
Data transmission method of the present invention can be applicable in the defined relaying framework of 3GPP TR36.806 agreement.
Corresponding with the embodiment of data transmission method of the present invention, the present invention also provides for the device of transfer of data, the embodiment of communication system.
Referring to Fig. 6, for the present invention is for the block diagram of an embodiment of the device of transfer of data, this device has been described the process of transfer of data from source base station side.
This device comprises: transmitting element 610, for sending SN state transfer message, comprises in described SN state transfer message for representing that the PDCP PDU that source base station does not receive that ACK feeds back wraps corresponding SN information;
As a kind of execution mode, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number.
As another kind of execution mode, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
Referring to Fig. 7, for the present invention is for the block diagram of another embodiment of the device of transfer of data, this device has been described the process of transfer of data from target BS side.
This device comprises: receiving element 710, and the SN state transfer message sending for reception sources base station, comprises in described SN state transfer message for representing that the PDCP PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information; And
As a kind of execution mode, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number.
As another kind of execution mode, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
Referring to Fig. 8, for the present invention is for the block diagram of an embodiment of the communication system of transfer of data.
This communication system comprises: arbitrary embodiment of the above-mentioned device 810 for transfer of data of describing from source base station side, and arbitrary embodiment of the device 820 for transfer of data of describing from target BS side, for example, described communication system can be LTE system.
Referring to Fig. 9, for the present invention is for the block diagram of an embodiment of the system of transfer of data.
This system comprises: a kind of system for transfer of data is provided, described system comprises: network interface 910, be used for sending SN state transfer message, in described SN state transfer message, comprise for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that ACK feeds back wraps corresponding SN information;
Processor 920, described processor 920 is for carrying out in the following order data retransmission: first the PDCP PDU bag of not receiving ACK feedback is transmitted to described target BS, and then PDCP Service Data Unit SDU bag is transmitted to described target BS.
As a kind of execution mode, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number.
As another kind of execution mode, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
Referring to Figure 10, for the present invention is for the block diagram of another embodiment of the system of transfer of data.
Described system comprises: network interface 1010, the SN state transfer message sending for reception sources base station, comprises in described SN state transfer message for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information;
As a kind of execution mode, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number.
As another kind of execution mode, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
As can be seen from the above embodiments, the present invention confirms that by comprising in the sequence number SN state transfer message sending at source base station for representing that described source base station is not received PDCP PDU wraps corresponding SN information, make after source eNB carries out data retransmission, can guarantee that having distributed the PDCP SDU of sequence number SN to wrap in target eNB at source eNB can also be assigned to identical SN, thereby guarantee the continuity of PDCP SDU bag.
The possible implementation that one of ordinary skill in the art will appreciate that various aspects of the present invention or various aspects can be embodied as system, method or computer program.Therefore, the possible implementation of each aspect of the present invention or various aspects can adopt complete hardware implementation example, complete implement software example (comprising firmware, resident software etc.), or the form of the embodiment of integration software and hardware aspect, is all referred to as " circuit ", " module " or " system " here.In addition, the possible implementation of each aspect of the present invention or various aspects can adopt the form of computer program, and computer program refers to the computer readable program code being stored in computer-readable medium.
Computer-readable medium can be computer-readable signal media or computer-readable recording medium.Computer-readable recording medium is including but not limited to electronics, magnetic, optics, electromagnetism, infrared or semiconductor system, equipment or device, or aforesaid appropriately combined arbitrarily, as random-access memory (ram), read-only memory (ROM), Erasable Programmable Read Only Memory EPROM (EPROM or flash memory), optical fiber, portable read-only memory (CD-ROM).
Processor in computer reads the computer readable program code being stored in computer-readable medium, makes processor can carry out the function action stipulating in the combination of in flow chart each step or each step; Generation is implemented in the device of the function action stipulating in each piece of block diagram or each combination.
Computer readable program code can be completely carried out on user's computer, part is carried out on user's computer, as independent software kit, part on user's computer and part on remote computer, or on remote computer or server, carry out completely.Also should be noted that in some alternate embodiment, in flow chart, in each step or block diagram, each dated function may be not according to occurring in sequence of indicating in figure.For example, depend on related function, in fact two steps or two pieces that illustrate in succession may be executed substantially concurrently, or these pieces sometimes may be carried out with reverse order.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (21)
1. a data transmission method, it is characterized in that, described method comprises step: source base station transmits Sequence Number SN state transfer message to target BS, comprises for representing that the PDCP PDCP protocol Data Unit PDU that described source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information in described SN state transfer message.
2. the method for claim 1, is characterized in that, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number.
3. whether method as claimed in claim 2, is characterized in that, also comprise to be used to indicate to need to transmit not receive that the PDCP PDU of ACK feedback wraps the field F of corresponding SN information in described PDCP PDU bag.
4. method as claimed in claim 3, is characterized in that, also comprises the field that is used to source base station not receive the PDCP PDU bag counting of ACK feedback in described PDCP PDU bag.
5. the method for claim 1, is characterized in that, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
6. the method as described in any one in claim 1,2,5, it is characterized in that, described method also comprises step: described source base station carries out data retransmission in the following order: first the PDCP PDU bag of not receiving ACK feedback is transmitted to described target BS, and then PDCP Service Data Unit SDU bag is transmitted to described target BS.
7. the method as described in any one in claim 1 ~ 5, is characterized in that, described method is applied in the defined relaying framework of 3GPP TR36.806 agreement.
8. a data transmission method, it is characterized in that, described method comprises step: target BS, from source base station receive sequence number SN state transfer message, comprises in described SN state transfer message for representing that the PDCP PDCP protocol Data Unit PDU that described source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information;
Described target BS is according to described SN information, is the PDCP Service Data Unit SDU the receiving sequence number that is responsible for assigning.
9. method as claimed in claim 8, is characterized in that, described SN information is field PDCP PDU number.
10. whether method as claimed in claim 9, is characterized in that, also comprise to be used to indicate to need to transmit not receive that the PDCP PDU of ACK feedback wraps the field F of corresponding SN information in described PDCP PDU bag.
11. methods as claimed in claim 10, is characterized in that, also comprise the field that is used to source base station not receive the PDCP PDU bag counting of ACK feedback in described PDCP PDU bag.
12. methods as claimed in claim 8, is characterized in that, described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
13. methods as described in any one in claim 8,9,12, it is characterized in that, described target BS is according to described SN information, for the PDCP SDU receiving is responsible for assigning before sequence number or afterwards, also comprise step: the data that described target BS forwards described source base station are in the following order carried out the processing of PDCP layer: first process the PDCP PDU bag of not receiving ACK feedback that described source base station forwards, then process the PDCP SDU bag that described source base station forwards.
14. methods as described in any one in claim 8 ~ 12, is characterized in that, described method is applied in the defined relaying framework of 3GPP TR36.806 agreement.
15. 1 kinds of devices for transfer of data, it is characterized in that, described device comprises: transmitting element, be used for sending SN state transfer message, in described SN state transfer message, comprise for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information.
16. devices as claimed in claim 15, is characterized in that, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number; Or
Described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
17. devices as described in claim 15 or 16, it is characterized in that, described device also comprises retransmission unit, described retransmission unit is for carrying out in the following order data retransmission: first the PDCP PDU bag of not receiving ACK feedback is transmitted to described target BS, and then PDCP Service Data Unit SDU bag is transmitted to described target BS.
18. 1 kinds of devices for transfer of data, it is characterized in that, described device comprises: receiving element, the SN state transfer message sending for reception sources base station, comprises in described SN state transfer message for representing that the PDCP PDCP protocol Data Unit PDU that source base station does not receive that acknowledge character ACK feeds back wraps corresponding SN information;
Allocation units for according to described SN information, are the PDCP Service Data Unit SDU the receiving sequence number that is responsible for assigning.
19. devices as claimed in claim 18, is characterized in that, described SN state transfer message is the PDCP PDU bag that source base station is not received ACK feedback, and described SN information is field PDCP PDU number; Or
Described SN state transfer message is PDCP SN status report, and described PDCP SN status report comprises described source base station and do not receive that the PDCP PDU of ACK feedback wraps corresponding SN information.
20. devices as described in claim 18 or 19, it is characterized in that, described device also comprises processing unit, be used for described allocation units according to described SN information, for the PDCP Service Data Unit SDU receiving is responsible for assigning before sequence number or afterwards, the data that in the following order described source base station forwarded are carried out the processing of PDCP layer: first process the PDCP PDU bag of not receiving ACK feedback that described source base station forwards, then process the PDCP SDU bag that described source base station forwards.
21. 1 kinds of communication systems for transfer of data, is characterized in that, described communication system comprises the device described in device and claim 18 ~ 20 any one described in claim 15 ~ 17 any one.
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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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Also Published As
| Publication number | Publication date |
|---|---|
| CN103888215B (en) | 2017-11-28 |
| CN107911201A (en) | 2018-04-13 |
| CN107911201B (en) | 2021-10-15 |
| WO2014094613A1 (en) | 2014-06-26 |
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