CN105577321A - Multicast downlink code rate coding method and device and base station - Google Patents
Multicast downlink code rate coding method and device and base station Download PDFInfo
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- CN105577321A CN105577321A CN201410555338.3A CN201410555338A CN105577321A CN 105577321 A CN105577321 A CN 105577321A CN 201410555338 A CN201410555338 A CN 201410555338A CN 105577321 A CN105577321 A CN 105577321A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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Abstract
The invention relates to a multicast downlink code rate coding method and device and a base station. The device comprises an obtaining module and a determining module, wherein the obtaining module obtains the wireless condition of non-discourse-right subscribers not carried by wireless resource control in the coverage range of the base station, and the determining module determines the media message coding rate carried by multicasting according to the wireless condition of the non-discourse-right subscribers. In the central area, UE signal condition is high, the access network sends downlink multicast sharing bearing information in high code rate, and RB is used to bear high data information; and in the edge area, wireless signals of UE are weak, data information carried by RB is low, and the downlink multicast sharing bearing information is sent in low code rate. Subscribers in the central and edge areas in the cell are coded and treated respectively to achieve the goal of saving wireless resources.
Description
Technical field
The present invention relates to mobile communication technology field, be specifically related to the descending code check coding method of a kind of multicast, device and base station.
Background technology
Trunking communication is a kind of mobile dispatching patcher, represents the Private Mobile Communication Network developing direction of one of communication system.Its group service provided has the technical characterstic such as channel sharing and dynamic assignment, can be the communication services such as the special command scheduling that the group users such as multiple department, unit provide.Twentieth century end, universal along with digital communication system, have also been obtained based on the trunked communication system of digital communication technology and business and applies widely.In recent years, the third generation and even the develop rapidly of forth generation wireless communication technology, it is also proposed broadband, many-sided demand such as high speed, smooth evolution to digital clustering communication system.
Based on the trunked communication system of LTE (LongTermEvolution, Long Term Evolution), in order to the demand that is broadband, high speed that can meet cluster communication service is born.
The existing trunked communication system based on LTE is realize shared channel like this to transmit descending group of information in wireless side:
After identical group makes a call, wireless side is set up downlink multicast by call property and is shared carrying, and according to all UE (UserEquipment registered under community, subscriber equipment) and the wireless signal situation of UE, judge the wireless signal situation of the poorest UE, and according to the CQI (ChannelQualityIndicator of the poorest UE, channel quality indicates) or parameters of other feedback UE signal strength signal intensities determine descending code check and send, correctly can demodulate with all UE under ensureing community the information that this downlink multicast shares carrying; Because UE is now without RRC (RadioResourceControl, wireless heterogeneous networks) connect, UE can according to BLER (BlockErrorRatio, bLock error rate) change or the cycle to Access Network status report, carry the Parameters variation information of CQI or other feedbacks UE signal strength signal intensity, Access Network continues to adjust descending code check according to the current value that reports of all UE.
Existing scheme, RB (the ResourceBlock of base station assigns, Resource Block) upper carrying data number be can solution transfer to determine by the UE of wireless signal the poorest under Access Network, if now most UE is in good region, and certain percentage or only have 1 UE in poor region, now Access Network can determine the transmission code rate of RB according to the RST of this 1 UE; The waste of Radio Resource can be caused like this.
Summary of the invention
The invention provides the descending code check coding method of a kind of multicast, device and base station, can realize that different code rates is adopted for the UE of same base station range, RB carries different data messages, save Radio Resource.
In order to realize foregoing invention object, the technical scheme that the present invention takes is as follows:
The descending code check coding method of a kind of multicast, comprising:
Obtain the radio conditions without the non-right of speech user of wireless heterogeneous networks carrying in base station range;
The media message code rate of described multicast bear is determined according to the radio conditions of described non-right of speech user.
Preferably, determine that the media message code rate of described multicast bear comprises according to the radio conditions of described non-right of speech user:
According to the radio conditions of described non-right of speech user, judge that described non-right of speech user is in the band of position of base station range,
When described non-right of speech user is in apart from region in the preset range at described base station range center, then region multicast bear code rate centered by the media message code rate determining described multicast bear,
When described non-right of speech user is in apart from region outside the preset range at described base station range center, then determine that the media message code rate of described multicast bear is fringe region multicast bear code rate;
Described central area multicast bear code rate is higher than described fringe region multicast bear code rate.
Or,
According to the radio conditions of described non-right of speech user, determine the channel quality indicator (CQI) value of described non-right of speech user,
When the CQI value of described non-right of speech user is greater than or equal to quality threshold, then determine that the media message code rate of described multicast bear is high order multicast bear code rate,
When described non-right of speech user CQI value is less than quality threshold, then determine that the media message code rate of described multicast bear is low-rank multicast bear code rate;
Described high order multicast bear code rate is higher than described low-rank multicast bear code rate.
Preferably, described method also comprises:
Receive the group beep-page message of right of speech user;
Judging whether described group of paging is video call, when being video call, performing the step of the radio conditions obtaining non-right of speech user.
Preferably, described method also comprises: set up downlink multicast carrying.
Preferably, carried to non-right of speech user transmission group beep-page message by described downlink multicast or eat dishes without rice or wine to non-right of speech user transmission group beep-page message.
For solving the problem, the present invention also provides a kind of multicast descending code check code device, comprising:
Acquisition module, for obtaining the radio conditions without the non-right of speech user of wireless heterogeneous networks carrying in base station range;
Determination module, for determining the media message code rate of described multicast bear according to the radio conditions of described non-right of speech user.
Preferably, according to the radio conditions of described non-right of speech user, described determination module determines that the media message code rate of described multicast bear comprises:
According to the radio conditions of described non-right of speech user, judge that described non-right of speech user is in the band of position of base station range,
When described non-right of speech user is in apart from region in the preset range at described base station range center, then region multicast bear code rate centered by the media message code rate determining described multicast bear,
When described non-right of speech user is in apart from region outside the preset range at described base station range center, then determine that the media message code rate of described multicast bear is fringe region multicast bear code rate;
Described central area multicast bear code rate is higher than described fringe region multicast bear code rate.
Or,
According to the radio conditions of described non-right of speech user, determine the channel quality indicator (CQI) value of described non-right of speech user,
When the CQI value of described non-right of speech user is greater than or equal to quality threshold, then determine that the media message code rate of described multicast bear is high order multicast bear code rate,
When described non-right of speech user CQI value is less than quality threshold, then determine that the media message code rate of described multicast bear is low-rank multicast bear code rate;
Described high order multicast bear code rate is higher than described low-rank multicast bear code rate.
Preferably, described device also comprises:
Communication module, for receiving the group beep-page message of right of speech user;
Judge module, for judging whether described group of paging is video call, when being video call, triggers acquisition module.
Preferably, described device also comprises: set up module, for setting up downlink multicast carrying.
Preferably, communication module described in described device is carried to non-right of speech user transmission group beep-page message by described downlink multicast or eats dishes without rice or wine to non-right of speech user transmission group beep-page message.
The present invention also provides a kind of base station, comprises above-mentioned descending code check code device.
Compared to the prior art the present invention, has following beneficial effect:
The present invention distinguishes according to the radio conditions of LTE system and sends the shared carrying of downlink multicast, and in central area, UE signal is better, and now Access Network shares beared information by high code check transmission downlink multicast, uses RB carry data information high; Edge region, the wireless signal residing for UE is poor, and RB carry data information is low, adopts low bit-rate to send downlink multicast and shares beared information, encode respectively and treat with a certain discrimination, reach the object of saving Radio Resource to center of housing estate zone user and fringe region user.
Accompanying drawing explanation
Fig. 1 is the structural representation of the descending code check code device of the embodiment of the present invention;
Fig. 2 is the flow chart of the descending code check coding method of the embodiment of the present invention one;
Fig. 3 is the access procedure figure of the embodiment of the present invention two cluster group calling non-right of speech user edge region target BS when carrying without downlink multicast;
Fig. 4 is the access procedure figure of the non-right of speech user of the embodiment of the present invention three cluster group calling when central area target BS carries without downlink multicast;
Fig. 5 is the access procedure figure of the non-right of speech user of the embodiment of the present invention four cluster group calling when target BS has downlink multicast to carry;
Fig. 6 is the non-right of speech user of the embodiment of the present invention five cluster group calling moves to base station center processing procedure figure at target BS edge;
Fig. 7 is the non-right of speech user of the embodiment of the present invention six cluster group calling moves to edge, base station processing procedure figure at target BS center.
Embodiment
Clearly understand for making goal of the invention of the present invention, technical scheme and beneficial effect, below in conjunction with accompanying drawing, embodiments of the invention are described, it should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Cluster user is divided into right of speech user and non-right of speech user, and wherein non-right of speech user refers to be in the group of activation, and reception group information and right of speech user send the user of information; Right of speech user refers to be in the group of activation, has right of speech, and sends the user of the message such as voice and video text to group.
The embodiment of the present invention provides a kind of descending code check coding method, comprising:
Obtain the radio conditions without the non-right of speech user of wireless heterogeneous networks carrying in base station range;
The media message code rate of described multicast bear is determined according to the radio conditions of described non-right of speech user.
Wherein, determine that the media message code rate of described multicast bear comprises according to the radio conditions of described non-right of speech user:
According to the radio conditions of described non-right of speech user, judge that described non-right of speech user is in the band of position of base station range,
When described non-right of speech user is in apart from region in the preset range at described base station range center, then region multicast bear code rate centered by the media message code rate determining described multicast bear,
When described non-right of speech user is in apart from region outside the preset range at described base station range center, then determine that the media message code rate of described multicast bear is fringe region multicast bear code rate;
Described central area multicast bear code rate is higher than described fringe region multicast bear code rate.
Or, according to the radio conditions of described non-right of speech user, determine the channel quality indicator (CQI) value of described non-right of speech user,
When the CQI value of described non-right of speech user is greater than or equal to quality threshold, then determine that the media message code rate of described multicast bear is high order multicast bear code rate,
When described non-right of speech user CQI value is less than quality threshold, then determine that the media message code rate of described multicast bear is low-rank multicast bear code rate;
Described high order multicast bear code rate is higher than described low-rank multicast bear code rate.
Wherein, the preset range at base station range center sets according to actual conditions, relevant to information such as the transmitting powers of base station.
Described method also comprises:
Receive the group beep-page message of right of speech user;
Judging whether described group of paging is video call, when being video call, performing the step of the radio conditions obtaining non-right of speech user.
Can be carried to non-right of speech user transmission group beep-page message by described downlink multicast or eat dishes without rice or wine to non-right of speech user transmission group beep-page message.
Described method also comprises: set up downlink multicast carrying.
As shown in Figure 1, the embodiment of the present invention provides a kind of descending code check code device, comprising:
Acquisition module, for obtaining the radio conditions without the non-right of speech user of wireless heterogeneous networks carrying in base station range;
Determination module, for determining the media message code rate of described multicast bear according to the radio conditions of described non-right of speech user.
According to the radio conditions of described non-right of speech user, described determination module determines that the media message code rate of described multicast bear comprises:
According to the radio conditions of described non-right of speech user, judge that described non-right of speech user is in the band of position of base station range,
When described non-right of speech user is in apart from region in the preset range at described base station range center, then region multicast bear code rate centered by the media message code rate determining described multicast bear,
When described non-right of speech user is in apart from region outside the preset range at described base station range center, then determine that the media message code rate of described multicast bear is fringe region multicast bear code rate;
Described central area multicast bear code rate is higher than described fringe region multicast bear code rate.
Or, according to the radio conditions of described non-right of speech user, determine the channel quality indicator (CQI) value of described non-right of speech user,
When the CQI value of described non-right of speech user is greater than or equal to quality threshold, then determine that the media message code rate of described multicast bear is high order multicast bear code rate,
When described non-right of speech user CQI value is less than quality threshold, then determine that the media message code rate of described multicast bear is low-rank multicast bear code rate;
Described high order multicast bear code rate is higher than described low-rank multicast bear code rate.
Described device also comprises:
Communication module, for receiving the group beep-page message of right of speech user;
Judge module, for judging whether described group of paging is video call, when being video call, triggers acquisition module.
Described device also comprises: set up module, for setting up downlink multicast carrying.
Described communication module can be carried to non-right of speech user transmission group beep-page message by described downlink multicast or eat dishes without rice or wine to non-right of speech user transmission group beep-page message.
Embodiment one
The main flow of the present embodiment is described in Fig. 2:
After the non-right of speech user equipment (UE) of A, base station (eNB) coverage receives the group beep-page message that eNB sends, discovery is one's own paging, and send group calling request to cluster core net, cluster core net is to eNB transmission group page response;
B, eNB, according to the radio conditions of described UE, judge that described UE is in center cell or edge cell;
C, when described UE is in center cell, eNB sends the media message of multicast bear to described UE by central area multicast bear code rate;
D, when described UE is in edge cell, eNB presses fringe region multicast bear code rate sends media message from multicast bear to described UE;
Wherein, multicast bear code rate in central area is higher than described fringe region multicast bear code rate.
In we's embodiment, base station is according to the radio conditions of the non-right of speech user obtained not with RRC carrying, judge that non-right of speech user is now in base station center region or fringe region, and according to whether there is central area non-right of speech user in base station range or fringe region non-right of speech user sets up downlink center region multicast bear or descending fringe region multicast bear, and the media message code rate of fringe region multicast bear is lower than the media message code rate of central area multicast bear.Adopt different code rates by central area and fringe region, the conversion of coding can complete by core net or by base station, realizes encoding respectively to center of housing estate zone user and fringe region user and treating with a certain discrimination.Reach the object of saving Radio Resource.
Embodiment two
As shown in Figure 3, the non-right of speech user of cluster group calling at target BS without downlink multicast carrying and be the access procedure of edge customer.
Step 101a, cluster core net receive the group calling request of right of speech user, to cluster wireless base station transmission group beep-page message.
Step 201a, cluster wireless base station judge this group paging whether video call, if non-video calling, by normal flow process, if video call, by flow processing of the present invention.Base station judges now whether base station has downlink multicast to carry, if do not have downlink multicast to carry, directly to transmission group beep-page message of eating dishes without rice or wine;
Step 202a, colony terminal receive group beep-page message now, return page response.
Step 301a, cluster core net receive page response, by right of speech user requirement and base station foundation group context.Base station issues group configuration message.
Step 302a, base station receive the status report of non-right of speech user UE.
Step 303a, the present embodiment, for simplifying criterion, CQI in the status report that base station is reported by UE judges that UE position is in fringe region or central area, as region centered by this example definition CQI>=11, is less than 11 for fringe region.The present embodiment describes UE and is in fringe region, and base station notice core net sets up the context of a low bit-rate carrying again, is carried through by this code check and eats dishes without rice or wine to send to UE.UE receives data now.
By this scheme implementation, if the downlink multicast that UE sets up is carried as the data of 2Mbps, and the Tbs of base station user (TransportBlockSize, transmission block size) Index (index) obedience is uniformly distributed.Before and after the invention process profit, Resourse Distribute contrast is as following table:
After this scheme implementation, be uniformly distributed lower RB use and use 15 less, save RB resource 37.5%;
Actual user distribution closer to standardized normal distribution, by the TbsIndex of UE be near the mark normal distribution calculate.
Adopt approximate test normal distribution, before the present embodiment, RB uses is 23, and it is 17 that rear RB use is implemented in this case, and saving RB resource is 6, and saving percentage is 26%;
Embodiment three
As shown in Figure 4, the non-right of speech user of cluster group calling target BS without downlink multicast carrying and centered by the access procedure of user.
Step 101b, cluster core net receive the group calling request of right of speech user, send group calling beep-page message to cluster wireless base station.
Step 201b, cluster wireless base station judge this group paging whether video call, if non-video calling, by normal flow process, if video call, by flow processing of the present invention.Base station judges now whether base station has downlink multicast to carry, and this scene does not have downlink multicast to carry, directly to transmission group beep-page message of eating dishes without rice or wine.
Step 202b, colony terminal receive group beep-page message now, return page response
Step 301b, cluster core net receive page response, by right of speech user requirement and base station foundation group context.Base station issues group configuration message.
Step 302b, base station receive the status report of non-right of speech user UE.
Step 303b, the present embodiment, for simplifying criterion, CQI in the status report that base station is reported by UE judges that UE position is in fringe region or central area, as region centered by this example definition CQI>=11, is less than 11 for fringe region.Base station judges that the position of now terminal is in central area, by central area encoder bit rate transmission group data content.UE receives data now.
Embodiment four
As shown in Figure 5, the non-right of speech user of the cluster group calling access procedure that has downlink multicast to carry at target BS.
Downlink multicast carrying is set up in step 101c, cluster core net and base station.
Step 201c, trunked base station send downlink multicast carrying data and group configuration data to eating dishes without rice or wine.
Step 202c, colony terminal receive group beep-page message now, and group configuration data-message, reception group paging data, and feed back the status report of UE.
Step 301c, cluster wireless base station receive the status report of colony terminal, judge that the position of now terminal is in central area or fringe region.
Step 302c, base station receive the status report of non-right of speech user UE.Judge that UE is in central area or fringe region, if central area, directly press now multicast bear data playback.If fringe region, re-establish a low bit-rate and share carrying, and multicast bear information is sent to eats dishes without rice or wine.
Embodiment five
As shown in Figure 6, the non-right of speech user of cluster group calling moves to the processing procedure of base station center at target BS edge.
Step 101d, non-right of speech user UE are in edge, base station, and in the non-right of speech user of the group being in video group calling, and move to center of housing estate.
Step 102d, UE periodic report status report, the present embodiment, for simplifying judgement flow process, adopts CQI to be greater than or equal to the judgement standard of region and fringe region centered by 11; When the status report CQI that UE reports is greater than 11, base station sends message to core net, requires to set up central user group context;
Step 201d, set up central user group multicast bear after, base station dispatching centre user organizes paging to eating dishes without rice or wine;
Step 202d, UE receive new paging, the central. set multicast bear information that demodulation is new;
Step 301d, base station upgrade edge customer information, if do not had the edge customer that this organizes, base station can discharge edge downlink multicast carrying.
Embodiment six
As shown in Figure 7, the non-right of speech user of cluster group calling moves to the processing procedure at edge, base station at target BS center.
Step 101e, UE are in base station center, and in the non-right of speech user of the group being in video group calling, and move to cell edge.
Step 102e, UE periodic report status report, the present embodiment, for simplifying judgement flow process, adopts CQI to be greater than or equal to the judgement standard of region and fringe region centered by 11; When the status report CQI that UE reports is less than 11, base station sends message to core net, requires to set up edge customer group context;
Step 201e, set up edge customer group multicast bear after, base station sends the paging of edge customer group to eating dishes without rice or wine;
Step 202e, UE receive new paging, the edge group multicast bear information that demodulation is new;
Step 301e, base station upgrade central user information, if do not had the central user that this organizes, base station can discharge center downlink multicast carrying.
Although disclosed execution mode as above, the execution mode that its content just adopts for the ease of understanding technical scheme of the present invention, is not intended to limit the present invention.Technical staff in any the technical field of the invention; under the prerequisite not departing from disclosed core technology scheme; any amendment and change can be made in the form implemented and details; but the protection range that the present invention limits, the scope that still must limit with appending claims is as the criterion.
Claims (13)
1. the descending code check coding method of multicast, is characterized in that, comprising:
Obtain the radio conditions without the non-right of speech user of wireless heterogeneous networks carrying in base station range;
The media message code rate of described multicast bear is determined according to the radio conditions of described non-right of speech user.
2. the method for claim 1, is characterized in that: determine that the media message code rate of described multicast bear comprises according to the radio conditions of described non-right of speech user:
According to the radio conditions of described non-right of speech user, judge that described non-right of speech user is in the band of position of base station range,
When described non-right of speech user is in apart from region in the preset range at described base station range center, then region multicast bear code rate centered by the media message code rate determining described multicast bear,
When described non-right of speech user is in apart from region outside the preset range at described base station range center, then determine that the media message code rate of described multicast bear is fringe region multicast bear code rate;
Described central area multicast bear code rate is higher than described fringe region multicast bear code rate.
3. the method for claim 1, is characterized in that: determine that the media message code rate of described multicast bear comprises according to the radio conditions of described non-right of speech user:
According to the radio conditions of described non-right of speech user, determine the channel quality indicator (CQI) value of described non-right of speech user,
When the CQI value of described non-right of speech user is greater than or equal to quality threshold, then determine that the media message code rate of described multicast bear is high order multicast bear code rate,
When described non-right of speech user CQI value is less than quality threshold, then determine that the media message code rate of described multicast bear is low-rank multicast bear code rate;
Described high order multicast bear code rate is higher than described low-rank multicast bear code rate.
4. the method for claim 1, is characterized in that: described method also comprises:
Receive the group beep-page message of right of speech user;
Judging whether described group of paging is video call, when being video call, performing the step of the radio conditions obtaining non-right of speech user.
5. the method for claim 1, is characterized in that: described method also comprises: set up downlink multicast carrying.
6. method as claimed in claim 5, be is characterized in that: carried to non-right of speech user transmission group beep-page message by described downlink multicast or eat dishes without rice or wine to non-right of speech user transmission group beep-page message.
7. the descending code check code device of multicast, is characterized in that, comprising:
Acquisition module, for obtaining the radio conditions without the non-right of speech user of wireless heterogeneous networks carrying in base station range;
Determination module, for determining the media message code rate of described multicast bear according to the radio conditions of described non-right of speech user.
8. device as claimed in claim 7, is characterized in that: according to the radio conditions of described non-right of speech user, described determination module determines that the media message code rate of described multicast bear comprises:
According to the radio conditions of described non-right of speech user, judge that described non-right of speech user is in the band of position of base station range,
When described non-right of speech user is in apart from region in the preset range at described base station range center, then region multicast bear code rate centered by the media message code rate determining described multicast bear,
When described non-right of speech user is in apart from region outside the preset range at described base station range center, then determine that the media message code rate of described multicast bear is fringe region multicast bear code rate;
Described central area multicast bear code rate is higher than described fringe region multicast bear code rate.
9. device as claimed in claim 7, is characterized in that: according to the radio conditions of described non-right of speech user, described determination module determines that the media message code rate of described multicast bear comprises:
According to the radio conditions of described non-right of speech user, determine the channel quality indicator (CQI) value of described non-right of speech user,
When the CQI value of described non-right of speech user is greater than or equal to quality threshold, then determine that the media message code rate of described multicast bear is high order multicast bear code rate,
When described non-right of speech user CQI value is less than quality threshold, then determine that the media message code rate of described multicast bear is low-rank multicast bear code rate;
Described high order multicast bear code rate is higher than described low-rank multicast bear code rate.
10. device as claimed in claim 7, is characterized in that: also comprise:
Communication module, for receiving the group beep-page message of right of speech user;
Judge module, for judging whether described group of paging is video call, when being video call, triggers acquisition module.
11. devices as claimed in claim 7, is characterized in that: also comprise: set up module, for setting up downlink multicast carrying.
12. devices as claimed in claim 11, is characterized in that: described communication module is carried to non-right of speech user transmission group beep-page message by described downlink multicast or eats dishes without rice or wine to non-right of speech user transmission group beep-page message.
13. 1 kinds of base stations, comprise the arbitrary described descending code check code device of claim 7 to 12.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410555338.3A CN105577321A (en) | 2014-10-17 | 2014-10-17 | Multicast downlink code rate coding method and device and base station |
| PCT/CN2015/086650 WO2016058442A1 (en) | 2014-10-17 | 2015-08-11 | Method and device for encoding multicast downlink code rate, and base station |
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| CN201410555338.3A CN105577321A (en) | 2014-10-17 | 2014-10-17 | Multicast downlink code rate coding method and device and base station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109891826A (en) * | 2017-03-17 | 2019-06-14 | 华为技术有限公司 | Network data processing method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109891826A (en) * | 2017-03-17 | 2019-06-14 | 华为技术有限公司 | Network data processing method and device |
| CN109891826B (en) * | 2017-03-17 | 2021-04-09 | 华为技术有限公司 | Network data processing method and device |
| US11438187B2 (en) | 2017-03-17 | 2022-09-06 | Huawei Technologies Co., Ltd. | Network data processing method and apparatus |
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| WO2016058442A1 (en) | 2016-04-21 |
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