CN107959554A - The repeating method and device of a kind of data - Google Patents
The repeating method and device of a kind of data Download PDFInfo
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- CN107959554A CN107959554A CN201610900268.XA CN201610900268A CN107959554A CN 107959554 A CN107959554 A CN 107959554A CN 201610900268 A CN201610900268 A CN 201610900268A CN 107959554 A CN107959554 A CN 107959554A
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- Prior art keywords
- data segment
- transmitting terminal
- transmission
- data
- ran node
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Classifications
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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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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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
- H04L1/1806—Go-back-N protocols
-
- 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
- H04L1/1848—Time-out mechanisms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
Abstract
The present invention relates to the communications field, the repeating method and device of more particularly to a kind of data.While retransmission efficiency is ensured, to lift overall data throughput.This method is：During transmitting terminal and receiving terminal carry out data transmission through RAN node, when notice of the RAN node based on transmitting terminal obtains the available re-transmission time for the setting of a certain data segment, the low layer re-transmission decision-making for being directed to above-mentioned data segment is formulated based on above-mentioned available re-transmission time by RAN node, so-called low layer re-transmission policy, refer to retransmit the data segment that needs retransmit without TCP, and only carry out rlc layer and MAC layer re-transmission, such re-transmission belongs to low layer re-transmission, TCP congestion mechanisms need not be triggered, therefore window is sent without establishing and adjusting, have the advantages that retransmission rate is soon and efficient, so as to greatly promote the entire throughput of system.
Description
Technical field
The present invention relates to the communications field, the repeating method and device of more particularly to a kind of data.
Background technology
Transmission control protocol (Transmission Control Protocol, TCP) is a kind of connection-oriented, reliable
, transport layer protocol based on byte stream.When carrying out message transmissions based on Transmission Control Protocol, it will usually cause because of network congestion
Message dropping, so that TCP re-transmissions can be triggered.
TCP is retransmitted and is broadly divided into Retransmission timeout (Retransmission Time Out, RTO) and two kinds of machines of Fast retransmission
System.
So-called Retransmission timeout mechanism, refers to that transmitting terminal often sends a data segment and just starts a timer, and waits true
Recognize information, receiving terminal, which often receives a data segment, will return to corresponding confirmation message.After transmitting terminal sends a certain data segment, if
The characterization for not receiving receiving terminal return before corresponding timer time-out is properly received confirmation message, and transmitting terminal is considered as corresponding number
Lose or damaged according to section, so as to trigger TCP re-transmissions.
But, it is generally the case that under Retransmission timeout mechanism, the duration that a timer is safeguarded is usually longer, (e.g.,
200ms-400ms), in this case, (it is far smaller than when the data segment that transmitting terminal is sent is less the time required to e.g., sending
During 200ms), it is still desirable to the maintenance duration (e.g., 200ms-400ms) of at least one timer is waited, could start to confirm number
Whether smoothly completed according to section transmission.Efficiency of transmission can be thus influenced, reduces the overall data throughput of system.
For the shortcoming of Retransmission timeout mechanism, generally use fast retransmission mechanism makes up at present.
So-called fast retransmission mechanism, after referring to that transmitting terminal sends some data segment, if receiving terminal does not have successfully received
This data segment, will return to confirmation (ACK) message of above-mentioned data segment when receiving a data packet every time to transmitting terminal,
When receiving terminal receives three identical ACK messages for above-mentioned data segment, that is, think that above-mentioned data segment has been lost or damaged
It is bad, so as to trigger Fast retransmission.
Such as：Transmitting terminal sends A, B, C, D, E, and 5 data segments, if receiving terminal is not successfully receiving data segment C, connect
Receiving end can send an ACK message for being directed to data segment C, be but also unsuccessfully received when receiving terminal is successfully received data segment D
During data segment C, receiving terminal may proceed to send second ACK message for being directed to data segment C to transmitting terminal, when receiving terminal is properly received
When being but also unsuccessfully received data segment C to data segment E, receiving terminal, which may proceed to send the 3rd to transmitting terminal, is directed to data segment C
ACK message.When TCP transmitting terminals receive three identical ACK messages for data segment C, transmitting terminal is considered as data
Section C has lost or has damaged, so as to trigger Fast retransmission.
But under the prior art, congestion control can all either be used using Retransmission timeout or Fast retransmission, transmitting terminal
Making mechanism reduces transmission window, can thus reduce the overall data throughput of system, so as to influence the overall performance of system.
The content of the invention
The embodiment of the present invention provides a kind of repeating method and device of data.While retransmission efficiency is ensured, to carry
Rise overall data throughput.
Concrete technical scheme provided in an embodiment of the present invention is as follows：
A kind of repeating method of data, transmitting terminal and receiving terminal are carried out data transmission by RAN, including：
Notice of the RAN node based on transmitting terminal, obtains the available re-transmission time that corresponding first data segment is set, wherein, can
It is that transmitting terminal is sent when determining that the first data segment is needed and retransmitted with re-transmission time, and transmitting terminal can be characterized with re-transmission time to the
Before one data segment carries out TCP re-transmissions, it can be used in the duration of low layer re-transmission；
RAN node is based on available re-transmission time, sets corresponding low layer re-transmission policy；
RAN node triggering performs low layer re-transmission policy.
Optionally, notice of the RAN node based on transmitting terminal, obtains the available re-transmission time that corresponding first data segment is set,
Including：
RAN node receives the notice that transmitting terminal uses predetermined manner to send, and is obtained from notice and can use re-transmission time；Its
In, predetermined manner is any one following mode：PDCP data PDU, PDCP control PDU, RLC control PDU, MAC CE and RRC
Signaling.
Optionally, can be that transmitting terminal determines that the first data segment needs to send when retransmitting with re-transmission time, including：
Re-transmission time can be used, be transmitting terminal receive n times for the first data segment ACK message after send, wherein,
ACK message is sent by receiving terminal, and success, N >=1 are not received for characterize data.
Optionally, if being transmitted as downlink transfer between transmitting terminal and receiving terminal, RAN node, which obtains, can use re-transmission time
Afterwards, before low layer re-transmission policy is set, further comprise：
Notice of the RAN node based on transmitting terminal, further obtains RTO timers time-consuming, and obtains first number
According to section, wherein, above-mentioned RTO timers are used to safeguard that transmitting terminal sends first data segment to the duration between triggering TCP re-transmissions；
RAN node is judged in the PDCP timers of local maintenance, if be there is time-consuming and has been consumed with above-mentioned RTO timers
Difference between time is no more than the PDCP timers of given threshold, wherein, RAN node is often next spontaneous to receiving terminal forwarding one
The data segment of sending end, can set a corresponding PDCP timer；If so, the first data received from transmitting terminal are not preserved then
Section, otherwise, preserves the first data segment received from transmitting terminal.
Optionally, RAN node determines the local difference that there is time-consuming and above-mentioned RTO timers between time-consuming not
After the PDCP timers of given threshold, before low layer re-transmission policy is set, further comprise：
When definite local is carrying out retransmitting for the low layer of first data segment, stops performing immediately, held alternatively, waiting
After row, obtain implementing result and determine to perform failure.
Optionally, RAN node is based on available re-transmission time, sets low layer re-transmission policy, including：
RAN node is based on available re-transmission time, sets a new PDCP timer for the first data segment, and set
RLC number of retransmissions, wherein, the maintenance duration of new PDCP timers is no more than available re-transmission time, and RLC number of retransmissions pair
The execution total duration answered is no more than the maintenance duration of new PDCP timers.
Optionally, if being transmitted as downlink transfer between transmitting terminal and receiving terminal, RAN node triggering performs low layer and retransmits
Strategy, including：
The RAN node is based on the first data segment and RLC number of retransmissions, and circulation performs following operation, until the first data
Untill Duan Chongchuan succeeds or reaches RLC number of retransmissions：
P MAC layer HARQ is performed for the first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for the first data segment to retransmit.
Optionally, if being transmitted as uplink between transmitting terminal and receiving terminal, RAN node triggering performs low layer and retransmits
Strategy, including：
RAN node notice transmitting terminal is based on the first data segment and RLC number of retransmissions, and circulation performs following operation, Zhi Dao
Untill one data segment retransmits successfully or reaches the RLC number of retransmissions：
P MAC layer HARQ is performed for the first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for the first data segment to retransmit.
A kind of repeating method of data, including：
Transmitting terminal sends the first data segment by RAN node to receiving terminal；
The notice that transmitting terminal is returned based on receiving terminal, determines that first data segment needs to retransmit；
Transmitting terminal sends the available re-transmission time of the corresponding first data segment setting to RAN node, notifies the RAN to save
Point can set corresponding low layer re-transmission policy and triggering to perform the low layer re-transmission policy based on described with re-transmission time, its
In, the transmitting terminal that can be characterized with re-transmission time is transmitted first data segment before control protocol TCP re-transmissions, can
The duration retransmitted for low layer.
A kind of retransmission arrangement of data, transmitting terminal and receiving terminal are carried out data transmission by the device, including：
Communication unit, for the notice based on transmitting terminal, obtains the available re-transmission time that corresponding first data segment is set, its
In, described can be that the transmitting terminal determines that first data segment needs to send when retransmitting with re-transmission time, and described use
Before re-transmission time characterizes transmitting terminal to first data segment progress TCP re-transmissions, it can be used in the duration of low layer re-transmission；
Setting unit, for using re-transmission time based on described, sets corresponding low layer re-transmission policy；
Execution unit, the low layer re-transmission policy is performed for triggering.
Optionally, the notice based on transmitting terminal, when obtaining the available re-transmission time that corresponding first data segment is set, communication unit
Member is used for：
The notice that transmitting terminal uses predetermined manner to send is received, and obtains from the notice and described can use re-transmission time；
Wherein, the predetermined manner is any one following mode：PDCP data PDU, PDCP control PDU, RLC control PDU, MAC CE
And RRC signaling.
Optionally, described can be that the transmitting terminal determines that first data segment needs to send when retransmitting with re-transmission time
, including：
It is described to use re-transmission time, be transmitting terminal receive n times for first data segment ACK message after send
, wherein, the ACK message is sent by receiving terminal, and success, N >=1 are not received for characterize data.
Optionally, if being transmitted as downlink transfer between transmitting terminal and receiving terminal, obtain described in can use re-transmission time it
Afterwards, before the low layer re-transmission policy is set, setting unit is further used for：
Notice based on transmitting terminal, further obtains RTO timers time-consuming, and obtains first data segment,
Wherein, the RTO timers are used to safeguard that transmitting terminal sends first data segment to the duration between triggering TCP re-transmissions；
In the PDCP timers for judging local maintenance, if exist time-consuming and the RTO timers time-consuming it
Between difference be no more than given threshold PDCP timers, wherein, RAN node often to receiving terminal forward one from transmitting terminal
Data segment, can set a corresponding PDCP timer；If so, do not preserve first data segment received from transmitting terminal then,
Otherwise, first data segment received from transmitting terminal is preserved.
Optionally, determine locally in the presence of the difference between time-consuming and the RTO timers time-consuming to be no more than and set
After the PDCP timers for determining threshold value, before the low layer re-transmission policy is set, setting unit is further used for：
When definite local is carrying out retransmitting for the low layer of first data segment, stop performing immediately, alternatively, waiting
After execution, obtain implementing result and determine to perform failure.
Optionally, re-transmission time is used based on described, when setting low layer re-transmission policy, setting unit is used for：
Re-transmission time is used based on described, one new PDCP timer, Yi Jishe are set for first data segment
RLC number of retransmissions is put, wherein, the maintenance duration of the new PDCP timers can use re-transmission time, and RLC no more than described
The corresponding maintenance duration for performing total duration and being no more than the new PDCP timers of number of retransmissions.
Optionally, if being transmitted as downlink transfer between transmitting terminal and receiving terminal, triggering performs the low layer and retransmits plan
When slightly, execution unit is used for：
Based on first data segment and the RLC number of retransmissions, circulation performs following operation, until the first data segment weight
Untill passing successfully or reaching the RLC number of retransmissions：
P MAC layer HARQ is performed for first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for first data segment to retransmit.
Optionally, if being transmitted as uplink between transmitting terminal and receiving terminal, triggering performs the low layer and retransmits plan
When slightly, execution unit is used for：
Notice transmitting terminal is based on first data segment and the RLC number of retransmissions, and circulation performs following operation, Zhi Dao
Untill one data segment retransmits successfully or reaches the RLC number of retransmissions：
P MAC layer HARQ is performed for first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for first data segment to retransmit.
A kind of retransmission arrangement of data, including：
First transmitting element, for sending the first data segment to receiving terminal by RAN node；
Determination unit, for the notice returned based on receiving terminal, determines that first data segment needs to retransmit；
Second transmitting element, for sending the available re-transmission time of the corresponding first data segment setting to RAN node, leads to
Know that the RAN node can use re-transmission time to set corresponding low layer re-transmission policy and triggering to perform the low layer weight described in being based on
Strategy is passed, wherein, the transmitting terminal that can be characterized with re-transmission time is transmitted first data segment control protocol TCP re-transmissions
Before, it can be used in the duration of low layer re-transmission.
In conclusion in the embodiment of the present invention, in the process that transmitting terminal and receiving terminal carry out data transmission through RAN node
In, when notice of the RAN node based on transmitting terminal obtains the available re-transmission time for the setting of a certain data segment, by RAN node
Low layer re-transmission decision-making for above-mentioned data segment is formulated based on above-mentioned available re-transmission time, so-called low layer re-transmission policy, that is, refer to
The data segment retransmitted to needs is retransmitted without TCP, and only carries out rlc layer and MAC layer re-transmission, and such re-transmission belongs to low layer weight
Biography, it is not necessary to TCP congestion mechanisms are triggered, therefore window is sent without establishing and adjusting, it is soon and efficient with retransmission rate
Advantage, so as to greatly promote the entire throughput of system.
Brief description of the drawings
Fig. 1 is system architecture schematic diagram in the embodiment of the present invention；
Fig. 2 is the protocol stack schematic diagram of each part in the embodiment of the present invention；
Fig. 3 is that downlink retransmits flow chart in the embodiment of the present invention；
Fig. 4 is uplink retransmission flow chart in the embodiment of the present invention；
Fig. 5 is PDCP data PDU schematic diagrames in the embodiment of the present invention；
Fig. 6 is that PDCP controls PDU schematic diagrames in the embodiment of the present invention；
Fig. 7 is that RLC controls PDU schematic diagrames in the embodiment of the present invention；
Fig. 8 is MAC CE schematic diagrames in the embodiment of the present invention；
Fig. 9 is a kind of retransmission arrangement structure diagram of data in the embodiment of the present invention；
Figure 10 is the structure diagram of the retransmission arrangement of another data in the embodiment of the present invention.
Embodiment
In order to while retransmission efficiency is ensured, overall data throughput is lifted, in the embodiment of the present invention, devise one kind
New retransmission mechanism, the new mechanism are：By the TCP layer triggering of UE or TCP Server and the cross-layer weight formulated by RAN node
Biography mechanism.
Further description is made to the preferred embodiment of the present invention below in conjunction with the accompanying drawings.
As shown in fig.1, in the embodiment of the present invention, in system there are it is some by user terminal (User Equipment,
UE), wireless access network (Radio Access Network, RAN) node, and some TCP servers (Server), UE with
Data interaction between TCP Server is, it is necessary to by RAN node (e.g., base station) transfer.
As shown in fig.2, in the embodiment of the present invention, UE is respectively application layer using five layer protocol stacks
(Application), transport layer (TCP/User Datagram Protocol, UDP), network layer (Internet
Protocol, IP), data link layer (Data Link Layer), physical layer (Physical Layer, PHY).Wherein, transmit
Two main protocols of layer are transmission control protocol (TCP) and User Datagram Protocol (UDP), and network layer main protocol is network
Interconnection agreement (IP), data link layer include Packet Data Convergence Protocol (Packet Date Convergence again
Protocol, PDCP), radio link layer control protocol (Radio Link Control, RLC), M AC (Media
Access Control, MAC) three sublayers.TCP Server using five layer protocol stacks, be respectively application layer, transport layer,
Network layer, layer 2 (L2), layer 1 (L1), wherein, two main protocols of transport layer are TCP and UDP, and network layer main protocol is
IP, and when RAN node and UE carry out data transmission using four layer protocol stacks, is respectively PDCP, RLC, MAC and PHY, when
It is respectively GPRS Tunnel Protocol (GPRS using four layer protocol stacks when RAN node carries out data transmission with TCP Server
Tunnelling Protocol, GTP-U), UDP, L2 and L1, therefore, the data segment transmitted between UE and TCP Server exists
Without TCP processing in RAN node.
In the embodiment of the present invention, no matter uplink (UE->TCP Server) or downlink transfer (TCP Server-
>UE), retransmit decision-making, it is necessary to when being retransmitted to data segment in transmitting procedure and formulated by RAN node, is classified into down below
Row retransmits and the aspect of uplink retransmission two is introduced respectively.
As shown in fig.3, in the embodiment of the present invention, the idiographic flow that downlink retransmits is as follows：
Step 301：TCP connections are established between UE and TCP Server.
Step 302：TCP Server send data segment a ... data segments m by RAN node to UE.
Step 303：UE is not successfully receiving data segment a, then UE sends the ACK for data segment a to TCP Server
Message.
Step 304：After TCP Server determine to receive N number of (N >=1) for the ACK message of data segment a, data are determined
Section a needs to retransmit.
Step 305：TCP Server can be with re-transmission time T1, time-consuming (RTO-T1) and data segment a be sent to RAN
Node.
In practical application, TCP Server often send a data segment, can start (the following letter of corresponding RTO timers
Claim RTO).Correspondingly, in the present embodiment, TCP Server can start a RTO, RAN node interim data after sending data segment a
Start a PDCP timer (e.g., PDCP discard timer) while section a, can be with if ignoring data transmission delay
Assert that RTO and PDCP timers start at the same time, and PDCP timers safeguard that duration is less than the maintenance duration of RTO.
When TCP Server continuously receive a ACK messages for data segment a of N (N >=1) of UE transmissions, TCP
Server determines available re-transmission time T1 according to the maintenance duration of RTO and time-consuming (RTO-T1), wherein, (RTO-T1)
Represent TCP Server send between the time that time of data segment a determines to need re-transmission data segment a to TCP Server when
Between section, referred to as time-consuming.
Can with re-transmission time T1 can in the following manner in any one be carried to RAN node：PDCP protocol datas
Unit (Protocol Date Unit, PDU), PDCP control PDU, RLC controls PDU, MAC Control Element (Control
Elements, CE) and wireless heterogeneous networks (Radio Resource Control, RRC) signaling.
Step 306：RAN node judges the local PDCP timers with the presence or absence of the first preset condition of satisfaction, wherein, it is so-called
First preset condition is：Difference between the time-consuming of PDCP timers and the time-consuming (RTO-T1) of RTO, which is no more than, to be set
Threshold value is determined, if so, then performing step 307；Otherwise, 308 are performed.
Specifically, after RAN node starts PDCP timers for data segment a, can be in local after PDCP timer expiries
Delete data segment a, and before PDCP timer expiries, RAN node may the notice based on UE, carried out for data segment a
Rlc layer and MAC layer retransmit, and therefore, as long as the PDCP timers that corresponding data section a is set have not timed out, are then necessarily gone back in RAN node
It is cached with data segment a；Wherein, rlc layer and MAC layer retransmit and TCP layer is retransmitted and mutually shielded, and can't influence the meter of RTO
When.
In the present embodiment, why judge the time-consuming and RTO differences between time-consuming of PDCP timers, be because
For in view of the error caused by a Time Delay of Systems such as propagation delay time, processing delay.
Step 307：RAN node judgement is local to be still cached with data segment a, then, performs step 309.
Specifically, if RAN node determines locally to illustrate to deposit there are the PDCP for meeting a first preset condition timer
It is close in the time-consuming of PDCP timer and the time-consuming (RTO-T1) of RTO, then, RAN node can be sentenced
Fixed, this RTO and PDCP timer is set for data segment a, at this time, since PDCP timers have not timed out,
RAN node can determine locally also to preserve data segment a, then, RAN node is just without preserving the number received from TCP Server
According to section a, in this way, it is possible to prevente effectively from the repetition storage of data.
In the process, if RAN node is carrying out the rlc layer of data segment a and MAC layer retransmits, can use following
Two ways processing：
The first processing mode is：The rlc layer and MAC layer for stopping data segment a immediately retransmit, and then, perform step 309.
Second of processing mode be：The rlc layer and MAC layer for continuing data segment a retransmit, and determine after retransmitting failure, are further continued for
Perform step 309.
Step 308：RAN node judges the local uncached data segment a for having data segment a, then preserving TCP Server transmission,
Then, step 309 is performed.
Specifically, if RAN node determines that a PDCP timer for meeting the first preset condition locally is not present, illustrate
There is no the time-consuming of PDCP timer and the time-consuming (RTO-T1) of RTO are close, then, RAN node judges pin
The data segment a PDCP timers set are had timed out, at this time, RAN node has cleared data the caching of section a, therefore, RAN sections
Point needs to preserve the data segment a sent from TCP Server.
Step 309：RAN node resets PDCP timers by available re-transmission time T1 and sets RLC re-transmissions time
Number (RLC RETX_COUNT).
At this time, maintenance duration≤T1 of PDCP timers, this way it is possible to avoid safeguarding RTO in duration in PDCP timers
Time-out, so as to avoid triggering RTO Retransmission timeouts；In addition it is also necessary to ensure that completing M times, (M is the value of RLC RETX_COUNT, M
>=1) RLC retransmits required total duration≤T1, can also so avoid not completing the RLC number of retransmissions of RAN node setting
When just trigger RTO Retransmission timeouts, and the corresponding total duration that performs of RLC number of retransmissions is no more than what RAN node was reset
The maintenance duration of PDCP timers.
Step 310：RAN node instruction UE is without the ACK message to TCP Server feedbacks for data segment a again.
Step 311：For RAN node in the maintenance duration of PDCP timers, the RLC number of retransmissions based on setting carries out RLC
Layer automatic retransmission request (Automatic Repeat Request, ARQ) retransmits and MAC layer hybrid automatic repeat-request
(Hybrid Automatic Repeat Request, HARQ) is retransmitted.
Specifically, when performing step 311, RAN node needs the execution number P for first setting MAC layer HARQ to retransmit, because
Rlc layer ARQ is retransmitted and MAC layer HARQ re-transmissions are that nested type performs, i.e., RAN node is based on data segment a and RLC number of retransmissions,
Circulation performs following operation：P (P >=1) MAC layer HARQ is performed for data segment a to retransmit, and a RLC is performed for data segment a
Layer ARQ retransmits.Wherein, once once MAC layer HARQ is retransmitted or rlc layer ARQ is retransmitted and is successfully executed, then RAN node
It can stop retransmission operation immediately；Alternatively, M rlc layer ARQ is retransmitted and be finished, RAN node can also stop retransmission operation.
Step 312：In available re-transmission time T1, if data segment a is retransmitted successfully, UE sends next to TCP server
The ACK message of a data segment x for needing to retransmit.
Such as：UE is not successfully receiving data segment a, data segment x, data segment m, then, for the available of data segment a
In re-transmission time T1, if data segment a retransmit successfully, due to, data segment x be after data segment a first do not transmit successfully
Data segment, therefore, UE can will be sent to TCP Server for the ACK message of data segment x, at this time, then use and step 304 phase
Same mode is formulated the re-transmission policy for data segment x by RAN node.
Step 313：If after RTO time-out, data segment a does not transmit success also, then RTO Retransmission timeout mechanism, TCP can be enabled
Server retransmits data segment a.
In the present embodiment, if RAN node is directed to the re-transmission policy of data segment a formulations after available re-transmission time T1 runs out of
Still without retransmitting successfully, then it can cause the RTO time-out of corresponding data section a, so that RTO timeout mechanisms can be enabled.
As shown in fig.4, in the embodiment of the present invention, the idiographic flow of uplink retransmission is as follows：
Step 401：TCP connections are established between TCP Server and UE.
Step 402：UE sends data segment a ... data segments m by RAN node to TCP Server.
Step 403：TCP Server are not successfully receiving data segment a, then TCP Server send to UE and are directed to data
The ACK message of section a.
Step 404：After UE determines to receive N number of (N >=1) for the ACK message of data segment a, determine that data segment a needs weight
Pass.
When UE continuously receives a ACK messages for data segment a of N (N >=1) of TCP Server transmissions, UE according to
The maintenance duration of RTO and time-consuming (RTO-T1) determine available re-transmission time T1, wherein, (RTO-T1) represents that UE is sent
The time of data segment a determines to need to retransmit the period between the time of data segment a to UE, referred to as time-consuming.
Step 405：UE judges the local PDCP timers with the presence or absence of the first preset condition of satisfaction, wherein, so-called first
Preset condition is：The difference between time-consuming (RTO-T1) is no more than setting threshold to the time-consuming and RTO of PDCP timers
Value, if so, then performing step 406；Otherwise, 407 are performed.
In practical application, UE often sends a data segment, can start corresponding RTO and PDCP timers.The present embodiment
In, UE can start a RTO after sending data segment a, while can start a PDCP timer, and during the maintenance of PDCP timers
The long maintenance duration for being less than RTO.After PDCP timer expiries, UE can locally delete data segment a.Therefore, it is as long as corresponding
The PDCP timers that data segment a is set have not timed out, then data segment a is necessarily also cached with UE.
In the present embodiment, why judge the time-consuming and RTO differences between time-consuming of PDCP timers, be because
For in view of the error caused by a Time Delay of Systems such as propagation delay time, processing delay.
Step 406：UE judgements are local to be still cached with data segment a, then, performs step 408.
Specifically, if UE determines locally to illustrate that there are one there are the PDCP for meeting a first preset condition timer
The time-consuming of a PDCP timers and the time-consuming (RTO-T1) of RTO are close, then, UE it is determined that, this RTO
It is to be set for data segment a with PDCP timers, at this time, since PDCP timers have not timed out, UE can be determined
It is local also to preserve data segment a.
Step 407：UE judgements are locally uncached data segment a, then UE needs to receive the data segment a issued from TCP layer, connects
, perform step 408.
Specifically, if UE determines that a PDCP timer for meeting the first preset condition locally is not present, illustrate not deposit
It is close in the time-consuming of PDCP timer and the time-consuming (RTO-T1) of RTO, then, UE judges to be directed to data segment a
The PDCP timers of setting have timed out, and at this time, the PDCP layers of UE have cleared data the caching of section a, therefore, UE need to receive from
The data segment a that TCP layer issues.
Step 408：UE can be sent to RAN node with re-transmission time T1.
Specifically, UE can in the following manner in any one can be sent to RAN node with re-transmission time：PDCP
Data PDU, PDCP control PDU, RLC control PDU, MAC CE and RRC signaling.
Step 409：RAN node instruction TCP Server are without the ACK message to UE feedbacks for data segment a again.
Step 410：RAN node resets PDCP timers by available re-transmission time T1 and sets RLC re-transmissions time
Number.
At this time, it shall be guaranteed that maintenance duration≤T1 of the PDCP timers reset, this way it is possible to avoid determining in PDCP
When device safeguard in duration RTO time-out, so as to avoid triggering RTO Retransmission timeouts；In addition it is also necessary to ensure that completing M times, (M is RLC weights
Pass the value of number, M >=1) the required total duration≤T1 of RLC re-transmissions, it can also so avoid setting in unfinished RAN node
RLC number of retransmissions when just trigger RTO Retransmission timeouts, and the corresponding total duration that performs of RLC number of retransmissions is no more than RAN node
The maintenance duration of the PDCP timers reset.
Step 411：The PDCP timers set are safeguarded that duration and RLC number of retransmissions notify UE by RAN node.
Step 412：UE is carried out in the maintenance duration of PDCP timers based on the RLC number of retransmissions that RAN node is set
Rlc layer ARQ is retransmitted and MAC layer HARQ is retransmitted.
Specifically, when performing step 412, UE needs the execution number P for first setting MAC layer HARQ to retransmit, because rlc layer
ARQ is retransmitted and MAC layer HARQ to retransmit be that nested type performs, i.e. UE is based on data segment a and RLC number of retransmissions, circulate execution with
Lower operation：P (P >=1) MAC layer HARQ is performed for data segment a to retransmit, performing a rlc layer ARQ for data segment a retransmits.
Wherein, once once MAC layer HARQ is retransmitted or a rlc layer ARQ is retransmitted and is successfully executed, then UE can stop retransmitting behaviour immediately
Make；Alternatively, M rlc layer ARQ is retransmitted and be finished, UE can also stop retransmission operation.
Step 413：In available re-transmission time T1, if data segment a is retransmitted successfully, TCP server send next to UE
The ACK message of a data segment x for needing to retransmit.
Such as：TCP Server are not successfully receiving data segment a, data segment x, data segment m, then, for data
In the available re-transmission time T1 of section a, if data segment a retransmit successfully, due to, data segment x be after data segment a first do not pass
Successful data segment is sent, therefore, TCP Server can will be sent to UE for the ACK message of data segment x, at this time, then be adopted by UE
Retransmit of the triggering for data segment x is determined the need for the mode identical with step 404.
Step 414：In available re-transmission time T1, data segment a retransmits failure, then after RTO time-out, UE can enable RTO
Retransmission timeout mechanism, data segment a is retransmitted to TCP Server.
In the present embodiment, in available re-transmission time T1, the side retransmitted with MAC layer HARQ is retransmitted according to rlc layer ARQ
Formula, does not still retransmit data segment a successfully, then, at the end of available re-transmission time T1, the RTO that corresponding data section a is set is just
Can be overtime, at this time, RTO retransmission mechanism will be triggered, then UE can retransmit data segment a using TCP layer retransmission scheme.
As can be seen from the above-described embodiment, the formulation of the re-transmission policy of data segment a be completed by RAN node (no matter on
Row retransmits or downlink retransmits), and RAN node determines that data segment a needs to retransmit, and is passed from the transmitting terminal of data to RAN node
Send what available re-transmission time T1 (UE or TCP Server) was triggered.In the embodiment of the present invention, transmitting terminal transmits available to RAN node
During re-transmission time T1, appointing in PDCP data PDU, PDCP control PDU, RLC control PDU, MAC CE and RRC signaling can be used
Anticipate a kind of mode, RAN node can be sent to re-transmission time T1.
Above-mentioned each mode is described in detail below.
First way：PDCP data PDU.
As shown in fig.5, in PDCP data PDU, the PDCP data can be judged using first in PDCP R
Whether carried in PDU can use re-transmission time T1.Such as：
If first R are " 1 ", then it represents that PDCP data PDU carries available re-transmission time T1；At this time, PDCP numbers
Carried according to preceding 4 bytes in data (DATA) field in PDU and need to be retransmitted the TCP sequence numbers of data segment, the 5th byte carries
Re-transmission time T1 can be used.
If first R are " 0 ", then it represents that PDCP data PDU, which is not carried, can use re-transmission time T1.
The second way：PDCP controls PDU.
It is used to indicate this as shown in fig.6, defining a new protocol Data Unit type (PDU type) at PDCP layers
It is the cross-layer information from TCP.
As shown in fig. 6, the first loss service data unit (First Missing SDU, FMS) is used for which to be indicated
TCP data section needs to retransmit (4 bytes), and just carries available re-transmission time T1 in corresponding Bitmap positions.
The third mode：RLC controls PDU.
As shown in fig.7, introduce a new RLC control PDU type (referred to as CPT) in rlc layer, for indicating that this is
The one cross-layer information from TCP.Confirm that sequence number (Acknowledgement_Sequence Number, ACK_SN) is used for
Indicate which TCP data section needs to retransmit, the position in NACK_SN List domains, which carries, can use re-transmission time T1.
4th kind of mode：MAC CE.
As shown in fig.8, MAC PDU are made of MAC header and MAC payload two parts.
Wherein, MAC header part includes Logic Channel Identifier (LCID) corresponding with the type of MAC CE and the MAC
The size L of CE.
A special LCID is defined in an mac header, for indicating that this is the cross-layer information from TCP.In MAC
Payload part carries the TCP data segment information and re-transmission time T1 for needing to retransmit.
As shown in fig.9, in the embodiment of the present invention, a kind of retransmission arrangement of data (e.g., RAN node) and connects transmitting terminal
Receiving end is carried out data transmission by the device, including at least communication unit 90, setting unit 91 and execution unit 92, wherein,
Communication unit 90, for the notice based on transmitting terminal, obtains the available re-transmission time that corresponding first data segment is set,
Wherein, it can be that transmitting terminal determines that the first data segment needs to send when retransmitting with re-transmission time, and can be characterized and sent out with re-transmission time
Before sending end carries out TCP re-transmissions to the first data segment, it can be used in the duration of low layer re-transmission；
Setting unit 91, for based on available re-transmission time, setting corresponding low layer re-transmission policy；
Execution unit 92, low layer re-transmission policy is performed for triggering.
Optionally, the notice based on transmitting terminal, when obtaining the available re-transmission time that corresponding first data segment is set, communication unit
Member 90 is further used for：
The notice that transmitting terminal uses predetermined manner to send is received, and is obtained from notice and can use re-transmission time；Wherein, preset
Mode is any one following mode：PDCP data PDU, PDCP control PDU, RLC control PDU, MAC CE and RRC signaling.
Optionally, can be that transmitting terminal determines that the first data segment needs to send when retransmitting with re-transmission time, including：
Re-transmission time can be used, be transmitting terminal receive n times for the first data segment ACK message after send, wherein,
ACK message is sent by receiving terminal, and success, N >=1 are not received for characterize data.
Optionally, if being transmitted as downlink transfer between transmitting terminal and receiving terminal, obtain can with after re-transmission time,
Before setting low layer re-transmission policy, setting unit 91 is further used for：
Notice based on transmitting terminal, further obtains RTO timers time-consuming, and obtains the first data segment, wherein,
RTO timers are used to safeguard that transmitting terminal sends the first data segment to the duration between triggering TCP re-transmissions；
In the PDCP timers for judging local maintenance, if there is time-consuming and RTO timers between time-consuming
Difference is no more than the PDCP timers of given threshold, wherein, RAN node often forwards the data from transmitting terminal to receiving terminal
Section, can set a corresponding PDCP timer；If so, not preserving the first data segment received from transmitting terminal then, otherwise, preserve
The first data segment received from transmitting terminal.
Optionally, determine locally in the presence of the difference between time-consuming and the RTO timers time-consuming to be no more than and set
After the PDCP timers for determining threshold value, before low layer re-transmission policy is set, setting unit 912 is further used for：
When definite local is carrying out retransmitting for the low layer of the first data segment, stop performing immediately, alternatively, waiting pending
After, obtain implementing result and determine to perform failure.
Optionally, based on available re-transmission time, when setting low layer re-transmission policy, setting unit 913 is used for：
Based on available re-transmission time, one new PDCP timer is set for the first data segment, and set RLC to retransmit
Number, wherein, the maintenance durations of new PDCP timers is no more than available re-transmission time, and RLC number of retransmissions is corresponding holds
Row total duration is no more than the maintenance duration of new PDCP timers.
Optionally, if being transmitted as downlink transfer between transmitting terminal and receiving terminal, when triggering performs low layer re-transmission policy,
Execution unit 92 is further used for：
Based on the first data segment and RLC number of retransmissions, circulation performs following operation, until the first data segment retransmit successfully or
Untill person reaches RLC number of retransmissions：
P MAC layer HARQ is performed for the first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for the first data segment to retransmit.
Optionally, if being transmitted as uplink between transmitting terminal and receiving terminal, when triggering performs low layer re-transmission policy,
Execution unit 92 is further used for：
Notice transmitting terminal is based on the first data segment and RLC number of retransmissions, and circulation performs following operation, until the first data segment
Untill retransmitting successfully or reaching RLC number of retransmissions：
P MAC layer HARQ is performed for the first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for the first data segment to retransmit.
As shown in fig.10, in the embodiment of the present invention, a kind of retransmission arrangement of data, including at least the first transmitting element
100th, 101 and second transmitting element 102 of determination unit, wherein,
First transmitting element 100, for sending the first data segment to receiving terminal by RAN node；
Determination unit 101, for the notice returned based on receiving terminal, determines that first data segment needs to retransmit；
Second transmitting element 102, when the available re-transmission of the first data segment setting is corresponded to for being sent to RAN node
Between, notify the RAN node to be based on described can be set with re-transmission time described in corresponding low layer re-transmission policy and triggering execution
Low layer re-transmission policy, wherein, it is described control protocol to be transmitted to first data segment with re-transmission time characterization transmitting terminal
Before TCP is retransmitted, it can be used in the duration of low layer re-transmission.
In conclusion in the embodiment of the present invention, in the process that transmitting terminal and receiving terminal carry out data transmission through RAN node
In, when notice of the RAN node based on transmitting terminal obtains the available re-transmission time for the setting of a certain data segment, by RAN node
Low layer re-transmission decision-making for above-mentioned data segment is formulated based on above-mentioned available re-transmission time, so-called low layer re-transmission policy, that is, refer to
The data segment retransmitted to needs is retransmitted without TCP, and only carries out rlc layer and MAC layer re-transmission, and such re-transmission belongs to low layer weight
Biography, it is not necessary to TCP congestion mechanisms are triggered, therefore window is sent without establishing and adjusting, it is soon and efficient with retransmission rate
Advantage, so as to greatly promote the entire throughput of system.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or square frame in journey and/or square frame and flowchart and/or the block diagram.These computer programs can be provided
The processors of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in fact
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided and is used for realization in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out the embodiment of the present invention various modification and variations without departing from this hair
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to comprising including these modification and variations.
Claims (18)
1. a kind of repeating method of data, transmitting terminal and receiving terminal are carried out data transmission by wireless access network RAN node, it is special
Sign is, including：
Notice of the RAN node based on transmitting terminal, obtains the available re-transmission time that corresponding first data segment is set, wherein, it is described can
It is that the transmitting terminal is sent when determining that first data segment is needed and retransmitted with re-transmission time, and described uses re-transmission time table
Sending end of levying is transmitted first data segment before control protocol TCP re-transmissions, can be used in the duration of low layer re-transmission；
RAN node can use re-transmission time described in being based on, and set corresponding low layer re-transmission policy；
RAN node triggering performs the low layer re-transmission policy.
2. the method as described in claim 1, it is characterised in that notice of the RAN node based on transmitting terminal, obtains corresponding first number
The available re-transmission time set according to section, including：
RAN node receives the notice that transmitting terminal uses predetermined manner to send, and obtains from the notice described can use when retransmitting
Between；Wherein, the predetermined manner is any one following mode：Packet Data Convergence Protocol PDCP data protocol data units
PDU, PDCP control PDU, RLC control PDU, media access control unit MAC CE and radio resource control RRC signaling.
3. the method as described in claim 1, it is characterised in that described can be that the transmitting terminal determines described with re-transmission time
One data segment needs what is sent when retransmitting, including：
It is described to use re-transmission time, be transmitting terminal receive n times for first data segment ACK message after send, its
In, the ACK message is sent by receiving terminal, and success, N >=1 are not received for characterize data.
4. the method as described in claim 1, it is characterised in that if being transmitted as downlink transfer between transmitting terminal and receiving terminal,
Before the low layer re-transmission policy is set, it can then be further comprised with after re-transmission time described in the RAN node acquisition：
Notice of the RAN node based on transmitting terminal, further obtains Retransmission timeout RTO timers time-consuming, and described in acquisition
First data segment, wherein, the RTO timers are used to safeguard that transmitting terminal sends first data segment and retransmits it to triggering TCP
Between duration；
RAN node is judged in the PDCP timers of local maintenance, if there is time-consuming and the RTO timers time-consuming
Between difference be no more than given threshold PDCP timers, wherein, RAN node often to receiving terminal forward one come from transmitting terminal
Data segment, a corresponding PDCP timer can be set；If so, first data received from transmitting terminal are not preserved then
Section, otherwise, preserves first data segment received from transmitting terminal.
5. method as claimed in claim 4, it is characterised in that RAN node determines that locally there is time-consuming determines with the RTO
When device the difference between time-consuming is no more than after the PDCP timers of given threshold,
Before the low layer re-transmission policy is set, further comprise：
When definite local is carrying out retransmitting for the low layer of first data segment, stop performing immediately, alternatively, waiting pending
After, obtain implementing result and determine to perform failure.
6. such as claim 1-5 any one of them methods, it is characterised in that RAN node can use re-transmission time based on described,
Low layer re-transmission policy is set, including：
RAN node can use re-transmission time described in being based on, and a new PDCP timer is set for first data segment, and
RLC number of retransmissions is set, wherein, the maintenance duration of the new PDCP timers can use re-transmission time no more than described, and
The corresponding maintenance duration for performing total duration and being no more than the new PDCP timers of RLC number of retransmissions.
7. method as claimed in claim 6, it is characterised in that if being transmitted as downlink transfer between transmitting terminal and receiving terminal,
Then RAN node triggering performs the low layer re-transmission policy, including：
The RAN node is based on first data segment and the RLC number of retransmissions, and circulation performs following operation, until first
Untill data segment retransmits successfully or reaches the RLC number of retransmissions：
P medium education hybrid automatic repeat-request MAC layer HARQ is performed for first data segment to retransmit, P >=1；
A radio link layer automatic retransmission request rlc layer ARQ is performed for first data segment to retransmit.
8. method as claimed in claim 6, it is characterised in that if being transmitted as uplink between transmitting terminal and receiving terminal,
Then RAN node triggering performs the low layer re-transmission policy, including：
The RAN node notice transmitting terminal is based on first data segment and the RLC number of retransmissions, and circulation performs following behaviour
Make, untill the first data segment retransmits successfully or reaches the RLC number of retransmissions：
P MAC layer HARQ is performed for first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for first data segment to retransmit.
A kind of 9. repeating method of data, it is characterised in that including：
Transmitting terminal sends the first data segment by wireless access network RAN node to receiving terminal；
The notice that transmitting terminal is returned based on receiving terminal, determines that first data segment needs to retransmit；
Transmitting terminal sends the available re-transmission time of the corresponding first data segment setting to RAN node, notifies the RAN node base
With re-transmission time corresponding low layer re-transmission policy and triggering can be set to perform the low layer re-transmission policy in described, wherein, institute
State available re-transmission time characterization transmitting terminal to be transmitted first data segment before control protocol TCP re-transmissions, can be used in
The duration that low layer retransmits.
10. a kind of retransmission arrangement of data, transmitting terminal and receiving terminal are carried out data transmission by described device, it is characterised in that
Including：
Communication unit, for the notice based on transmitting terminal, obtains the available re-transmission time that corresponding first data segment is set, wherein,
Described can be that the transmitting terminal determines that first data segment needs to send when retransmitting with re-transmission time, and the re-transmission
Time representation transmitting terminal is transmitted first data segment before control protocol TCP re-transmissions, can be used in low layer re-transmission
Duration；
Setting unit, for using re-transmission time based on described, sets corresponding low layer re-transmission policy；
Execution unit, the low layer re-transmission policy is performed for triggering.
11. device as claimed in claim 10, it is characterised in that the notice based on transmitting terminal, obtains corresponding first data segment
During the available re-transmission time set, the communication unit is used for：
The notice that transmitting terminal uses predetermined manner to send is received, and obtains from the notice and described can use re-transmission time；Wherein,
The predetermined manner is any one following mode：Packet Data Convergence Protocol PDCP data protocol data units PDU, PDCP are controlled
PDU, RLC control PDU, media access control unit MAC CE and radio resource control RRC signaling processed.
12. device as claimed in claim 10, it is characterised in that described can be that the transmitting terminal determines described with re-transmission time
First data segment needs what is sent when retransmitting, including：
It is described to use re-transmission time, be transmitting terminal receive n times for first data segment ACK message after send, its
In, the ACK message is sent by receiving terminal, and success, N >=1 are not received for characterize data.
13. device as claimed in claim 10, it is characterised in that if being transmitted as downlink biography between transmitting terminal and receiving terminal
It is defeated, then can be with after re-transmission time described in acquisition, before the low layer re-transmission policy is set, the setting unit is further used
In：
Notice based on transmitting terminal, further obtains Retransmission timeout RTO timers time-consuming, and obtains first data
Section, wherein, the RTO timers are used to safeguard that transmitting terminal sends first data segment to the duration between triggering TCP re-transmissions；
In the PDCP timers for judging local maintenance, if there is time-consuming and the RTO timers between time-consuming
Difference is no more than the PDCP timers of given threshold, wherein, RAN node often forwards the data from transmitting terminal to receiving terminal
Section, can set a corresponding PDCP timer；If so, do not preserve first data segment received from transmitting terminal then, otherwise,
Preserve first data segment received from transmitting terminal.
14. device as claimed in claim 13, it is characterised in that determine local in the presence of time-consuming and the RTO timers
The difference between time-consuming is no more than after the PDCP timers of given threshold, before the low layer re-transmission policy is set,
The setting unit is further used for：
When definite local is carrying out retransmitting for the low layer of first data segment, stop performing immediately, alternatively, waiting pending
After, obtain implementing result and determine to perform failure.
15. such as claim 10-14 any one of them devices, it is characterised in that use re-transmission time based on described, set
During low layer re-transmission policy, the setting unit is used for：
Re-transmission time is used based on described, one new PDCP timer is set for first data segment, and RLC is set
Number of retransmissions, wherein, the maintenance duration of the new PDCP timers can use re-transmission time no more than described, and RLC is retransmitted
The corresponding maintenance duration for performing total duration and being no more than the new PDCP timers of number.
16. device as claimed in claim 15, it is characterised in that if being transmitted as downlink biography between transmitting terminal and receiving terminal
Defeated, then when triggering performs the low layer re-transmission policy, the execution unit is used for：
Based on first data segment and the RLC number of retransmissions, circulation performs following operation, until the first data segment retransmit into
Work(or untill reaching the RLC number of retransmissions：
P medium education hybrid automatic repeat-request MAC layer HARQ is performed for first data segment to retransmit, P >=1；
A radio link layer automatic retransmission request rlc layer ARQ is performed for first data segment to retransmit.
17. device as claimed in claim 15, it is characterised in that if being transmitted as uplink biography between transmitting terminal and receiving terminal
Defeated, then when triggering performs the low layer re-transmission policy, the execution unit is used for：
Notice transmitting terminal is based on first data segment and the RLC number of retransmissions, and circulation performs following operation, until the first number
Untill retransmitting successfully according to section or reach the RLC number of retransmissions：
P MAC layer HARQ is performed for first data segment to retransmit, P >=1；
A rlc layer ARQ is performed for first data segment to retransmit.
A kind of 18. retransmission arrangement of data, it is characterised in that including：
First transmitting element, for sending the first data segment to receiving terminal by RAN node；
Determination unit, for the notice returned based on receiving terminal, determines that first data segment needs to retransmit；
Second transmitting element, the available re-transmission time of the corresponding first data segment setting is sent for transmitting terminal to RAN node,
Notify the RAN node described in being based on re-transmission time can be used to set corresponding low layer re-transmission policy and triggering to perform the low layer
Re-transmission policy, wherein, the transmitting terminal that can be characterized with re-transmission time is transmitted first data segment control protocol TCP weights
Before biography, it can be used in the duration of low layer re-transmission.
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| CN104836646A (en) * | 2014-02-12 | 2015-08-12 | 普天信息技术研究院有限公司 | Method for enhancing transmission reliability of RLC AM mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311725A (en) * | 2019-07-26 | 2021-02-02 | 华为技术有限公司 | Data processing method and device and terminal |
| CN112311725B (en) * | 2019-07-26 | 2022-01-11 | 华为技术有限公司 | Data processing method and device and terminal |
| WO2021056308A1 (en) * | 2019-09-26 | 2021-04-01 | 华为技术有限公司 | Processing method and network device |
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