CN104486051A - Data retransmission method and device - Google Patents
Data retransmission method and device Download PDFInfo
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- CN104486051A CN104486051A CN201410753071.9A CN201410753071A CN104486051A CN 104486051 A CN104486051 A CN 104486051A CN 201410753071 A CN201410753071 A CN 201410753071A CN 104486051 A CN104486051 A CN 104486051A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
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Abstract
The invention discloses a data retransmission method and a data retransmission device. The method comprises the following steps of when a PDCP (Packet Data Convergence Protocol) is established, acquiring an RLC (Radio Link Control) mode of a DRB (Data Radio Bearer), and counting PDUs (Protocol Data Units) needing to be retransmitted; if the RLC mode of the current DRB is an acknowledge mode and the number of the PDUs needing to be retransmitted is greater than a set threshold value, reducing the retransmission rate, and sending the PDUs needing to be retransmitted according to the reduced retransmission rate. According to the method and the device, the data retransmission rate of the PDCP within a period of time in the early stage of data retransmission can be reduced, a state report sent by the PDCP of UE (User Equipment) is waited in the retransmission process, and data which truly need to be retransmitted are re-determined, so that waste of a great number of air interface resources caused by transmission of excess PDUs which are transmitted before reestablishment is avoided.
Description
Technical field
The present invention relates to field of data transmission, be specifically related to a kind of data repeating method and device.
Background technology
LTE base station (eNB, evolved Node B) or user terminal (UE, User Equipment) are communicated by air interface, and functionally see, air protocol comprises user face protocol stack and chain of command protocol stack.Wherein, air protocol stack comprises following layer: wireless heterogeneous networks (Radio Resource Control, RRC) layer, PDCP (Packet Data Convergence Protocol, PDCP) layer, wireless spread-spectrum technology (Radio Link Control, RLC) layer, medium education (Medium AccessControl, MAC) layer.
In normal data transmission procedure, data surface service data unit (the Service Data Unit that the PDCP of base station can will be kept in local cache, SDU) through header suppression, encryption, PDCP protocol Data Unit (Protocol Data Unit is formed after adding sequence number SN head, PDU) bottom rlc layer is sent to, through HARQ (the Automatic Repeat-request of rlc layer, and the hybrid automatic repeat-request of MAC layer (Hybrid Automatic Repeat Request ARQ), HARQ) data are sent to terminal UE afterwards.Wherein for affirmation mode (the Acknowledge Mode of rlc layer, AM) after UE successfully receives one group of data, RLC can indicate PDCP, the PDU of the PDCP that this SN is corresponding is successfully received by UE, then PDCP can delete from local cache with this SN and less than this SN corresponding to the PDU of all PDCP.
When eating dishes without rice or wine, link-quality is deteriorated, or other reasons is when can cause data cube computation to re-establish, retransmit the PDU that the SN that the PDCP of base station can not acknowledged receipt of by UE from first is corresponding, in the process, the PDCP of base station can receive the status report of UE end, can learn which PDU is not received by UE from report, because the status report of UE end feedback has certain time delay, in the process, the PDCP of base station has likely retransmitted a lot of PDU, likely most PDU is received by UE, just not timely base station to be fed back, now once more retransmit, especially these PDU are larger, unnecessary interface-free resources will be taken, waste a lot of interface-free resources.
Summary of the invention
The embodiment of the present invention provides a kind of data repeating method and device, there is transfer of data re-establish in process because PDCP retransmits the problem of a large amount of interface-free resources of the waste that causes of PDU in order to solve in prior art.
The embodiment of the present invention provides a kind of data repeating method, and the method comprises:
Carry out PDCP PDCP when re-establishing, obtain the wireless spread-spectrum technology RLC pattern of Data Radio Bearer DRB, and statistics needs the quantity of the protocol Data Unit PDU retransmitted;
If the RLC pattern of current DRB is affirmation mode, and need the quantity of the PDU retransmitted to be greater than setting threshold, then reduce retransmission rate, and send the described PDU needing to retransmit according to the retransmission rate after reducing.
Preferably, also comprise:
Carry out in the process that PDCP re-establishes, need the PDU retransmitted to retransmit if described, then transmission rate is reverted to normal transmission rate.
Preferably, also comprise:
Carry out, in the process that PDCP re-establishes, if receive the PDCP status report of terminal, then transmission rate being reverted to normal transmission rate.
Preferably, described receive the PDCP status report of terminal after, comprising:
Obtain the sequence number of the PDU reported in the PDCP status report of described terminal;
Whether the sequence number of the PDU reported described in judgement is greater than the sequence number of the PDU of current re-transmission;
If so, then from the PDU that described first of reporting loses, data re-transmission is carried out.
Preferably, described reduction retransmission rate, comprising:
According to the ratio of setting, reduce current retransmission rate.
The embodiment of the present invention also provides a kind of data retransmission device, and this device comprises:
Data capture unit, for carry out PDCP PDCP re-establish time, obtain the wireless spread-spectrum technology RLC pattern of Data Radio Bearer DRB, and statistics needs the quantity of the protocol Data Unit PDU retransmitted;
Data re-transmission unit, if be affirmation mode for the RLC pattern of current DRB, and needs the quantity of the PDU retransmitted to be greater than setting threshold, then reduces retransmission rate, and sends the described PDU needing to retransmit according to the retransmission rate after reducing.
Preferably, described data re-transmission unit also for:
Carry out in the process that PDCP re-establishes, need the PDU retransmitted to retransmit if described, then transmission rate is reverted to normal transmission rate.
Preferably, described data re-transmission unit also for:
Carry out, in the process that PDCP re-establishes, if receive the PDCP status report of terminal, then transmission rate being reverted to normal transmission rate.
Preferably, described data re-transmission unit also for:
Described receive the PDCP status report of terminal after, obtain the sequence number of the PDU reported in the PDCP status report of described terminal;
Whether the sequence number of the PDU reported described in judgement is greater than the sequence number of the PDU of current re-transmission;
If so, then from the PDU that described first of reporting loses, data re-transmission is carried out.
Preferably, described data re-transmission unit specifically for:
According to the ratio of setting, reduce current retransmission rate.
The embodiment of the present invention is by obtaining the pattern of the RLC of DRB, and statistics needs the quantity of the PDU retransmitted, when the RLC pattern confirming current DRB is affirmation mode, and when needing the quantity of the PDU retransmitted to be greater than setting threshold, then reduce retransmission rate, and send according to the retransmission rate after reducing the PDU needing to retransmit.Transmission rate when can reduce the data re-transmission of PDCP by the embodiment of the present invention, the status report that the PDCP of UE sends is waited in the process retransmitted, and again judge laying equal stress on fax just needing retransmit data, prevent from being transmitted across many PDU be transmitted across, cause the waste of a large amount of interface-free resources.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of a kind of data repeating method in the embodiment of the present invention;
Fig. 2 is the structural representation of a kind of data retransmission device in the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
In normal data transfer process, the PDCP PDCP of base station can be kept at data surface service data unit (the Service Data Unit of local cache, SDU), the protocol Data Unit (Protocol Data Unit, PDU) forming PDCP after carrying out header suppression, encryption, interpolation sequence number SN head is sent to wireless spread-spectrum technology rlc layer.Through HARQ (the Automatic Repeat-request of rlc layer, ARQ) and the hybrid automatic repeat-request of media access control MAC layer (Hybrid Automatic RepeatRequest, HARQ) afterwards data be sent to terminal UE.Wherein for affirmation mode (the Acknowledge Mode of RLC, AM), after UE successfully receives bag data, RLC can indicate PDCP PDU corresponding to this SN in PDCP successfully to be received by UE, then PDCP can delete from local cache with this SN and less than this SN corresponding to all PDCP PDU.This wherein relates to some dynamic variables, and we represent with FstNotAckedSn the SN that first is not identified the PDCP PDU received.The SN of the next PDCP PDU that will send is represented with NextTxSn.For the data of wireless data carrying DRB under PDCP AM, SN scope is 0 – 4095.Such as after PDCP is dealt into 100 from 0, NextTxSn=101, if RLC indicates the PDCP PDU before SN=50 successfully to be received by UE to PDCP, then the dynamic variable FstNotAckedSn=50 of PDCP.Wherein RLC feeds back the difference of the dynamic parameter that the PDCP ageing meeting that successfully receives information is correlated with due to rlc layer and different.We enumerate a set of common rlc layer configuration parameter and carry out problem analysis, as reordered, timer reOrderingTimer is configured to 80ms, inquiry retransmission timer pollRetxTimer is configured to 80ms, inquiry PDU number pollPdu is configured to 128, and inquiry byte number pollByte is configured to 125Kbyte.It is fewer that this cover parameter can make RLC status report send, and save interface-free resources, but feedback information has larger delayed time delay.In order to describe the problem better, we illustrate by concrete numeral below.Find through actual test, on average after the PDCP of base station opens originating data from Sn=0, when being sent to NextTxSn=400, just can obtain the feedback information of a UE, the PDCP PDU before instruction SN=380 is successfully received by UE.When base station continues again to be sent to NextTxSn=700, probably temporarily also do not receive the feedback again of UE.
When eating dishes without rice or wine, link-quality is deteriorated, or other reasons can cause data cube computation to re-establish.Retransmit the SN of PDU that now base station PDCP can not acknowledged receipt of by UE from first.By scene above, the PDCP of base station can retransmit from SN=380, retransmits to SN=700 always, then just starts to send new data.The PDCP layer transmitting terminal of base station can receive the status report of UE when re-establishing, this status report comprises the reception situation of UE to PDCP PDU, and namely which data which PDU be have received by UE and do not received by UE.But due to space interface signaling interaction time delay, UE side and base station side can not synchronously re-establish, and ordinary circumstance base station is more Zao than UE to be re-established, thus causes the PDCP of UE side delayed to the time of the PDCP status report of base station side simultaneously.Therefore in above-mentioned scene, the PDCP of base station may receive the PDCP layer state report of UE when retransmitting to SN=600, this status report can carry first and lose SN information (First Miss SN, FSM), this FSM indicates the SN=680 of UE PDCP of first disappearance before re-establishing, and all PDCP PDU before showing SN=680 are just successfully received by UE before re-establishing.Now, the PDCP of base station can retransmit from SN=680, until SN=700 transmits new data after retransmitting again.Said process shows: the most data retransmission of PDCP of base station is all unnecessary.The such as packet of above-mentioned SN=380 to SN=600 is all unnecessary, especially can take unnecessary interface-free resources when these packets are all larger.
In order to solve the problem, as shown in Figure 1, embodiments provide a kind of data repeating method, the method step comprises:
Step S101, carries out PDCP PDCP when re-establishing, and obtains the wireless spread-spectrum technology RLC pattern of Data Radio Bearer DRB, and statistics needs the quantity of the protocol Data Unit PDU retransmitted;
Step S102, if the RLC pattern of current DRB is affirmation mode, and needs the quantity of the PDU retransmitted to be greater than setting threshold, then reduces retransmission rate, and sends the described PDU needing to retransmit according to the retransmission rate after reducing.
When eating dishes without rice or wine, link-quality is deteriorated, or when the data cube computation that causes of other reasons re-establishes.Whether the RLC pattern detecting DRB is affirmation mode, and add up the quantity needing the PDU retransmitted when re-establishing, when detecting that the RLC pattern of current DRB is affirmation mode, and the quantity of PDU that the needs of statistics retransmit is when being greater than the threshold value of setting, then reduce retransmission rate, and send the described PDU needing to retransmit according to the retransmission rate after reducing.Transmission rate when reducing the data re-transmission of PDCP by the present embodiment, the status report that the PDCP of UE sends is waited in the process retransmitted, and the data that the fax that again judges to lay equal stress on just is needing to retransmit, prevent from being transmitted across many PDU be transmitted across, cause the waste of a large amount of interface-free resources.
Preferably, the invention provides an embodiment, comprising:
When eating dishes without rice or wine, link-quality is deteriorated, or when the data cube computation that causes of other reasons re-establishes.Whether the RLC pattern detecting DRB is affirmation mode, and add up the quantity needing the PDU retransmitted when re-establishing, when detecting that the RLC pattern of current DRB is affirmation mode, and the quantity of PDU that the needs of statistics retransmit is when being greater than the threshold value of setting, will retransmission rate be reduced, and send the described PDU needing to retransmit according to the retransmission rate after reducing.If carrying out in the process that PDCP re-establishes, due to the affiliated negligible amounts needing the PDU retransmitted, when not waiting until the PDCP status report that terminal UE is uploaded, if the PDU retransmitted is needed to retransmit described, then cancel the restriction to transmission rate, transmission rate is reverted to normal transmission rate, continues the PDU that transmission is new.The embodiment of the present invention prevents from needing the PDU retransmitted to retransmit, and the time waste that essential factor is waited for the PDCP status report that terminal UE is uploaded and caused.Therefore, as long as retransmitted, just can continue to transmit new PDU.
Preferably, the invention provides an embodiment, comprising:
When eating dishes without rice or wine, link-quality is deteriorated, or when the data cube computation that causes of other reasons re-establishes.Whether the RLC pattern detecting DRB is affirmation mode, and add up the quantity needing the PDU retransmitted when re-establishing, when detecting that the RLC pattern of current DRB is affirmation mode, and the quantity of PDU that the needs of statistics retransmit is when being greater than the threshold value of setting, will retransmission rate be reduced, and send the described PDU needing to retransmit according to the retransmission rate after reducing.If carrying out in the process that PDCP re-establishes, needing the PDU retransmitted also not retransmit, now receiving the PDCP status report of terminal, then cancel the restriction to transmission rate, transmission rate is reverted to normal transmission rate.The present embodiment is the PDU in order to prevent too much transmission unnecessary, causes the waste of interface-free resources.
Further, described receive the PDCP status report of terminal after, just can obtain the sequence number SN that the PDU that reports in the PDCP status report of described terminal is corresponding, when the sequence number SN of the described PDU reported is greater than the sequence number SN of the PDU of current re-transmission, just from the PDU that described first of reporting loses, carry out data re-transmission.When the sequence number SN of the described PDU reported is less than or equal to the sequence number SN of the PDU of current re-transmission, just continues to retransmit the PDU also do not completed according to normal transmission rate, after having retransmitted, carry out new transfer of data again.The present embodiment can save the time of re-transmission, avoids the PDU that too much re-transmission is unnecessary.
Preferably, carry out in the process that PDCP re-establishes above-mentioned, described reduction retransmission rate refers to the ratio according to setting, reduces current retransmission rate, retransmit as carried out according to 10% regular transmission rate (this ratio can empirically set, proportion can value 0 ~ 100%).
Preferably, the invention provides an embodiment, comprising:
When eating dishes without rice or wine, link-quality is deteriorated, or other reasons can cause data cube computation to re-establish.Now the pattern of the RLC of current DRB is detected in base station, and statistics needs the quantity of the PDU retransmitted, and is 300 as counted on the quantity needing the PDU retransmitted.When the RLC pattern current DRB being detected is affirmation mode, and the quantity 300 of the PDU of current needs re-transmission is greater than setting threshold 30, and (this setting threshold is free to setting, for being greater than the integer of 0), the PDCP of base station retransmits then can start the SN of the PDU do not acknowledged receipt of by UE from first, as the SN=380 of the PDU that first is not acknowledged receipt of by UE, now transmitting from the PDU that SN=380 is corresponding with regard to needing, transferring to the PDU that SN=680 is corresponding always.In the process, need to reduce transmission rate, if normal transmission rate is transmit 20 PDU each dispatching cycle, transmission rate after then reducing can transmit 3 PDU for each dispatching cycle, 15% normal transmission rate (this ratio can empirically set, proportion can value 0 ~ 100%) is reduced to by retransmission rate.In the process of data re-transmission, as the SN=400 that the PDU retransmitted is corresponding, the PDCP of base station receives the PDCP status report that UE reports, the sequence number SN information that first is not successfully received PDU is carried in this report, as this SN=600, this SN is greater than the SN of the PDU of current re-transmission, and therefore the PDCP of base station can retransmit according to normal transmission rate from the PDU that SN=600 is corresponding, transfer to the PDU that SN=680 is corresponding always, start afterwards to transmit new PDU.The present embodiment shows, most of PDU that the PDCP of base station retransmits is unnecessary, and PDU as corresponding in above-mentioned SN=380 to SN=599 is unnecessary, according to data repeating method of the present invention, can avoid transmitting these unnecessary PDU, save a large amount of interface-free resources.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of data retransmission device, and the principle of dealing with problems due to this device is similar to above-mentioned a kind of data repeating method, and therefore the enforcement of this device see the enforcement of method, can repeat part and repeat no more.
As shown in Figure 2, this device comprises:
Data capture unit 201, for carry out PDCP PDCP re-establish time, obtain the wireless spread-spectrum technology RLC pattern of Data Radio Bearer DRB, and statistics needs the quantity of the protocol Data Unit PDU retransmitted;
Data re-transmission unit 202, if be affirmation mode for the RLC pattern of current DRB, and needs the quantity of the PDU retransmitted to be greater than setting threshold, then reduces retransmission rate, and sends the described PDU needing to retransmit according to the retransmission rate after reducing.
Preferably, described data re-transmission unit 202 also for:
Carry out in the process that PDCP re-establishes, need the PDU retransmitted to retransmit if described, transmission rate is reverted to normal transmission rate.
Preferably, described data re-transmission unit 202 also for:
Carry out, in the process that PDCP re-establishes, if receive the PDCP status report of terminal, transmission rate being reverted to normal transmission rate.
Preferably, described data re-transmission unit 202 also for:
Obtain the sequence number of the PDU reported in the PDCP status report of described terminal;
Whether the sequence number of the PDU reported described in judgement is greater than the sequence number of the PDU of current re-transmission;
If so, then from the PDU that described first of reporting loses, data re-transmission is carried out.
Preferably, described data re-transmission unit 202 specifically for:
According to the ratio of setting, reduce current retransmission rate.
It can be seen from the above, the embodiment of the present invention is by detecting whether the RLC pattern of DRB is affirmation mode, and add up the quantity needing the PDU retransmitted when re-establishing, when detecting that the RLC pattern of current DRB is affirmation mode, and the quantity of PDU that the needs of statistics retransmit is when being greater than the threshold value of setting, will retransmission rate be reduced, and send the described PDU needing to retransmit according to the retransmission rate after reducing.When the PDU of described re-transmission has retransmitted or received the PDCP status report of terminal, then cancel the restriction to transmission rate, transmission rate has been reverted to normal transmission rate.Can prevent from being transmitted across many PDU be transmitted across, cause the waste of a large amount of interface-free resources.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a data repeating method, is characterized in that, the method comprises:
Carry out PDCP PDCP when re-establishing, obtain the wireless spread-spectrum technology RLC pattern of Data Radio Bearer DRB, and statistics needs the quantity of the protocol Data Unit PDU retransmitted;
If the RLC pattern of current DRB is affirmation mode, and need the quantity of the PDU retransmitted to be greater than setting threshold, then reduce retransmission rate, and send the described PDU needing to retransmit according to the retransmission rate after reducing.
2. the method for claim 1, is characterized in that, also comprises:
Carry out in the process that PDCP re-establishes, need the PDU retransmitted to retransmit if described, then transmission rate is reverted to normal transmission rate.
3. the method for claim 1, is characterized in that, also comprises:
Carry out, in the process that PDCP re-establishes, if receive the PDCP status report of terminal, then transmission rate being reverted to normal transmission rate.
4. method as claimed in claim 3, is characterized in that, described receive the PDCP status report of terminal after, comprising:
Obtain the sequence number of the PDU reported in the PDCP status report of described terminal;
Whether the sequence number of the PDU reported described in judgement is greater than the sequence number of the PDU of current re-transmission;
If so, then from the PDU that described first of reporting loses, data re-transmission is carried out.
5. the method for claim 1, is characterized in that, described reduction retransmission rate, comprising:
According to the ratio of setting, reduce current retransmission rate.
6. a data retransmission device, is characterized in that, this device comprises:
Data capture unit, for carry out PDCP PDCP re-establish time, obtain the wireless spread-spectrum technology RLC pattern of Data Radio Bearer DRB, and statistics needs the quantity of the protocol Data Unit PDU retransmitted;
Data re-transmission unit, if be affirmation mode for the RLC pattern of current DRB, and needs the quantity of the PDU retransmitted to be greater than setting threshold, then reduces retransmission rate, and sends the described PDU needing to retransmit according to the retransmission rate after reducing.
7. device as claimed in claim 6, is characterized in that, described data re-transmission unit also for:
Carry out in the process that PDCP re-establishes, need the PDU retransmitted to retransmit if described, then transmission rate is reverted to normal transmission rate.
8. device as claimed in claim 6, is characterized in that, described data re-transmission unit also for:
Carry out, in the process that PDCP re-establishes, if receive the PDCP status report of terminal, then transmission rate being reverted to normal transmission rate.
9. device as claimed in claim 8, is characterized in that, described data re-transmission unit also for:
Described receive the PDCP status report of terminal after, obtain the sequence number of the PDU reported in the PDCP status report of described terminal;
Whether the sequence number of the PDU reported described in judgement is greater than the sequence number of the PDU of current re-transmission;
If so, then from the PDU that described first of reporting loses, data re-transmission is carried out.
10. device as claimed in claim 6, is characterized in that, described data re-transmission unit specifically for:
According to the ratio of setting, reduce current retransmission rate.
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Address after: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee before: Comba Telecom System (China) Ltd. |