CN108306710A - Data transmission method based on twisted-pair feeder in a kind of DAS system - Google Patents
Data transmission method based on twisted-pair feeder in a kind of DAS system Download PDFInfo
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- CN108306710A CN108306710A CN201711435479.1A CN201711435479A CN108306710A CN 108306710 A CN108306710 A CN 108306710A CN 201711435479 A CN201711435479 A CN 201711435479A CN 108306710 A CN108306710 A CN 108306710A
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- das system
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- pair feeder
- data transmission
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 101000911390 Homo sapiens Coagulation factor VIII Proteins 0.000 claims 1
- 102000057593 human F8 Human genes 0.000 claims 1
- 229940047431 recombinate Drugs 0.000 claims 1
- 230000006798 recombination Effects 0.000 claims 1
- 238000005215 recombination Methods 0.000 claims 1
- 102100029272 5-demethoxyubiquinone hydroxylase, mitochondrial Human genes 0.000 abstract description 2
- 101000770593 Homo sapiens 5-demethoxyubiquinone hydroxylase, mitochondrial Proteins 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005538 encapsulation Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
- H04L1/0008—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Abstract
The present invention provides a kind of methods carried out data transmission using twisted-pair feeder in DAS system.DAS equipment is divided into access unit (AU), expanding element (EU) and distal end capping unit (RU), is attached using twisted-pair feeder between each unit.DAS system automatically selects the rates such as 10Gbps, 5Gbps, 2.5Gbps, 1Gbps that IEEE 802.3an and IEEE 802.bz are defined and carries out data transmission according to different transmission medium characteristics (twisted-pair type CAT6A/CAT6/CAT5E/CAT5, length etc.).
Description
Technical field
The present invention relates to twisted-pair feeder is based in the indoor distributed antenna system field (DAS) more particularly to a kind of DAS system
Data transmission method.
Background technology
With the fast development of mobile Internet, indoor distributed system needs are replaced, upgrade, to provide preferably letter
Number covering.In order to reduce Construction Cost and difficulty, it would be desirable to it is updated upgrading in original indoor distribution equipment,
Equipment before replacement as few as possible.Using existing a large amount of CAT6/CAT5 cables in building, the biography of data is realized
It is defeated, signal covering is completed, optimal selection is become.
In some more old buildings, may only have the cable of CAT5 to be distributed.In order to support different types of biography
Defeated cable, DAS equipment must use compatible design, to cope with different application scenarios.
IEEE has issued IEEE 802.3an 10GBASE-T standards in 2006, supports on 100 meters of CAT6A cables
Realize the transmission of 10Gbps.2016,100 meters of CAT5E was supported in the publication of IEEE 802.3bz 5G/2.5GBASE-T standards
The transmission of 5Gbps/2.5Gbps is realized on cable, compared with the standard of prior-generation, the transmission rate of CAT5E cables improves 5
Times.
Herein based under above-mentioned background, proposing the data transmission method based on twisted-pair feeder in a kind of DAS system, fully profit
With existing CAT6/CAT5 cables in building, the arrangement of high performance indoor distributed system is quickly and easily completed.
Invention content
The present invention provides the data transmission method based on twisted-pair feeder in a kind of DAS system.
The technical scheme is that：
1, have respectively in DAS system AU (Access Unit access units), EU (Expansion Unit far-end units) and
RU (Remote Unit expanding elements).Using support IEEE 802.3an and IEEE 802.3bz standards between each unit
PHY chip passes through twisted pair line connection.
2, PHY chip carries out rate adaptation according to type, the length of transmission medium.It is adaptive that FPGA obtains PHY chip
Result.
3, FPGA reaches the transmission rate with PHY chip according to the Adaptive Rate Shape CPRI frame formats of PHY chip
Match.
4, CPRI frames are encapsulated as the data packet of Ethernet according to the standard of IEEE 802.3 by FPGA, are passed by PHY chip
It is defeated.
5, receiving terminal FPGA caches the ethernet frame received, eliminates the deviation of frame and frame period time, then goes
Except the head and tail of Ethernet, the CPRI frame consistent with transmitting terminal is reverted to.
Description of the drawings
Fig. 1 is the DAS system schematic diagram of the present invention；
Fig. 2 is the schematic diagram of transmitting terminal and receiving terminal of the present invention；
Fig. 3 is the schematic diagram that the present invention is encapsulated as CPRI frames ethernet frame；
When Fig. 4 is 5G transmission rates in the present invention CPRI frames and encapsulation after ethernet frame format schematic diagram；
Fig. 5 is the schematic diagram that receiving terminal caching outputs and inputs sequential in the present invention；
Fig. 6 is the flow chart that different transmission rates are handled in the present invention.
Specific implementation mode
The invention will be described further with reference to the accompanying drawings and examples：
As shown in Figure 1 and Figure 2, carried out data transmission by transport protocol between DAS equipment.The present embodiment uses CPRI
(Common Public Radio Interface) agreement.Because using twisted-pair feeder as transmission medium, need to seal CPRI frames
Dress is ethernet format, is transmitted by PHY chip.XGMII interfaces are used between FPGA and PHY chip, according to IEEE 802.3
Specification is packaged CPRI frames, constitutes ethernet frame.Wherein, need reserved location as ethernet frame in original CPRI frames
Expense.Fig. 3 show the original CPRI frames under 10G rates and the ethernet frame after encapsulation.
After system electrification or cable plug again, PHY chip can carry out adaptive according to the situation of transmission medium.From
After the completion of adaptation, FPGA obtains the transmission rate of PHY chip, if it is the transmission rate of 10G, then in the way of Fig. 2 pair
After CPRI encapsulation, it is sent directly to PHY chip.
If PHY chip transmission rate is 5G, the format for adjusting CPRI frames is needed, and be encapsulated as ethernet frame.In order to
Ensure that data are not abandoned by PHY chip, the data rate that FPGA is transferred to PHY chip should be not more than 5G.Fig. 4 show 5G speed
The ethernet frame after original CPRI frames and encapsulation under rate, wherein CPRI frames only have half length to can be used for transmission data.
Similarly, if PHY chip transmission rate is 2.5G or 1G, CPRI frame formats are adjusted according to the method described above, and encapsulate
For ethernet frame.Under 2.5G rates, CPRI frames only have 1/4 length to can be used for data transmission；Under 1G rates, CPRI frames only have 1/10
Length can be used for data transmission.
When transmission rate is lower from height, during recombinant C PRI frames, part I/Q data is inevitably abandoned.System
System assigns different I/Q datas different priority, preferential to retain the high I/Q data of priority during frame recombinates, and loses
Abandon the low I/Q data of priority.
In receiving terminal, need ethernet frame reverting to CPRI frames.By taking 5G transmission rates as an example, the transmission of PHY chip is
Based on ethernet frame carry out, although transmitting terminal is sent according to shown in Fig. 3, between the ethernet frame that receiving terminal receives between
Difference is might have every (IPG).As shown in figure 5, the interval between frame and frame may not be a steady state value.Therefore receiving terminal
FPGA needs to first pass through a cache module to correct this deviation, and after correction, the interval between frame and frame becomes constant, with hair
Sending end is consistent.Then the head and tail for removing ethernet frame, reverts to CPRI frames.
When equipment normal operation, the state for monitoring PHY chip is needed.If link disconnects, need again adaptively, and root
According to the transmission rate of adaptive result, corresponding CPRI frame formats are configured, as shown in Figure 6.
Above example is only used for better illustrating the present invention rather than limitation of the invention.Within the scope of the invention,
Variation, the modification of above example are fallen within protection scope of the present invention.
Claims (6)
1. the data transmission method based on twisted-pair feeder in a kind of DAS system, the DAS system includes access unit AU, distal end list
FPGA module is set in first EU and expanding element RU, wherein access unit AU, far-end unit EU and expanding element RU, feature exists
In：Pass through the PHY chip multiple twin of support IEEE 802.3an and IEEE 802.3bz standards between the DAS system each unit
Line connects, and data are encapsulated as ethernet frame according to 802.3 specifications of IEEE and are transmitted.
2. the data transmission method based on twisted-pair feeder in DAS system according to claim 1, it is characterised in that：It is described
The PHY chip of DAS system automatically selects maximum transmission rate that medium can be supported and corresponding according to the characteristic of transmission medium
Frame format carry out data transmission.
3. the data transmission method based on twisted-pair feeder in DAS system according to claim 1, it is characterised in that：It is described
The FPGA module of DAS system obtain the PHY chip it is adaptive as a result, according to the Adaptive Rate Shape of the PHY chip
CPRI frame formats reach and are matched with the transmission rate of the PHY chip.
4. the data transmission method based on twisted-pair feeder in DAS system according to claim 2, it is characterised in that：To passing
I/Q data in transmission of data assigns different priority, excellent when transmission rate reduces and needs to recombinate transmission data
First retain the high I/Q data of priority.
5. the data transmission method based on twisted-pair feeder in DAS system according to claim 1, it is characterised in that：The DAS
System receiving terminal is non-constant by caching time interval to eliminate ethernet frame and frame, output and the DAS system transmitting terminal
Consistent frame timing.
6. the data transmission method based on twisted-pair feeder in DAS system according to claim 1, it is characterised in that：The DAS
When system operation, the transmission state of twisted-pair feeder is monitored, if transmission rate changes, after recombination transmission data is to match change
Rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711435479.1A CN108306710A (en) | 2017-12-26 | 2017-12-26 | Data transmission method based on twisted-pair feeder in a kind of DAS system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711435479.1A CN108306710A (en) | 2017-12-26 | 2017-12-26 | Data transmission method based on twisted-pair feeder in a kind of DAS system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108306710A true CN108306710A (en) | 2018-07-20 |
Family
ID=62867423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711435479.1A Withdrawn CN108306710A (en) | 2017-12-26 | 2017-12-26 | Data transmission method based on twisted-pair feeder in a kind of DAS system |
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| CN (1) | CN108306710A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005450A (en) * | 2006-12-15 | 2007-07-25 | 上海华为技术有限公司 | General public radio interface data transmission method and its device and system |
| CN101931454A (en) * | 2009-06-19 | 2010-12-29 | 大唐移动通信设备有限公司 | Ethernet-based remote radio data transmission |
| CN102611529A (en) * | 2012-02-27 | 2012-07-25 | 福建三元达通讯股份有限公司 | Method for realizing non-error transmission of more than 100 meters on twisted pair |
-
2017
- 2017-12-26 CN CN201711435479.1A patent/CN108306710A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005450A (en) * | 2006-12-15 | 2007-07-25 | 上海华为技术有限公司 | General public radio interface data transmission method and its device and system |
| CN100438506C (en) * | 2006-12-15 | 2008-11-26 | 华为技术有限公司 | General public radio interface data transmission method, device and system thereof |
| CN101931454A (en) * | 2009-06-19 | 2010-12-29 | 大唐移动通信设备有限公司 | Ethernet-based remote radio data transmission |
| CN102611529A (en) * | 2012-02-27 | 2012-07-25 | 福建三元达通讯股份有限公司 | Method for realizing non-error transmission of more than 100 meters on twisted pair |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180720 |
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