CN111182559A - 5G transformation method based on passive DAS - Google Patents
5G transformation method based on passive DAS Download PDFInfo
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- CN111182559A CN111182559A CN201911350515.3A CN201911350515A CN111182559A CN 111182559 A CN111182559 A CN 111182559A CN 201911350515 A CN201911350515 A CN 201911350515A CN 111182559 A CN111182559 A CN 111182559A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
Abstract
The invention discloses a 5G reconstruction method based on a passive DAS, which comprises the following steps: s1: performing 5G coverage requirement analysis on a place covered by the passive DAS to obtain a difference index of the passive DAS and the 5G coverage, and judging whether feeder line improvement needs to be performed or not according to the difference index; s2: testing the passive DAS, judging whether the output power of an antenna port meets the 5G requirement, if the output power of the antenna port meets the 5G requirement, replacing the antenna is not needed, and if the output power of the antenna port does not meet the 5G requirement, replacing the antenna; s3: setting a modification scheme according to the judgment result of the step S1 and the judgment result of the step S2; s4: and modifying the passive DAS according to a set modification scheme. According to the invention, a 5G modification method based on the passive DAS is constructed by analyzing the requirements of the covered places of the passive DAS and combining the difference index and the test result of the passive DAS, the adaptability of the method is strong, and the coverage of the passive DAS to 5GD is realized.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a passive DAS-based 5G reconstruction method.
Background
Passive DAS systems are a room decomposition solution used since the 2G era. The radio frequency source radio signal source is divided by a series of passive devices such as power dividers, couplers and the like, and the signals are distributed to each pair of low-power antennas which are arranged in various areas in a building through feeder lines for transmission without any signal amplification. The multi-system signals are combined into a set of indoor subsystem systems by adopting a combiner or POI (multi-system combining platform) mode, so as to form resource co-construction sharing.
In the coverage of the current mobile communication indoor distribution system, the passive DAS system has a large weight. How to realize the upgrading of the passive DAS system and enable the passive DAS system to meet the requirement of 5G coverage is the key for realizing the quick 5G network distribution and avoiding the resource waste.
Therefore, a passive DAS-based 5G modification method is urgently needed to be researched.
Disclosure of Invention
The invention provides a passive DAS-based 5G reconstruction method for overcoming the defect that a passive DAS in the prior art cannot meet the 5G coverage requirement.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
A5G modification method based on a passive DAS comprises the following steps:
s1: performing 5G coverage requirement analysis on a place covered by the passive DAS to obtain a difference index of the passive DAS and the 5G coverage, and judging whether feeder line improvement needs to be performed or not according to the difference index;
s2: testing the passive DAS, judging whether the output power of an antenna port meets the 5G requirement, if the output power of the antenna port meets the 5G requirement, the antenna does not need to be replaced, and if the output power of the antenna port does not meet the 5G requirement, the antenna is replaced;
s3: setting a modification scheme according to the judgment result of the step S1 and the judgment result of the step S2;
s4: and modifying the passive DAS according to a set modification scheme.
Further, the step S1 of determining whether feeder line modification needs to be added according to the difference index specifically includes:
the difference index is whether the peak downloading experience of the 5G network needs to be obtained in a place covered by the passive DAS, if the peak downloading experience of the 5G network needs to be obtained, a feeder line needs to be added, and if the peak downloading experience of the 5G network does not need to be obtained, the feeder line does not need to be added.
Further, in the step S3, the setting of the modification scheme according to the determination result in the step S1 and the determination result in the step S2 specifically includes: if the step S1 determines that the feeder needs to be added and the antenna does not need to be replaced in the step S2, the modification scheme 1 is set;
if the step S1 determines that the feeder needs to be added and the antenna needs to be replaced in the step S2, the modification scheme 3 is set;
if the step S1 determines that the feeder is not required to be added and the antenna needs to be replaced in the step S2, the modification 2 is set.
Further, in step S2, the passive DAS system is tested, and the test indexes include: standing wave ratio, antenna output power.
Furthermore, the standing-wave ratio tester is used as a signal source for testing the standing-wave ratio and is connected into the indoor distribution system, and the frequency band of the signal source is set to be 2.6GHz for a 5G room.
Further, the standing wave ratio tester is used for testing the output power of the antenna to output signals of a 4G E frequency point and a 5G 2.6GHz frequency point respectively.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, a 5G modification method based on the passive DAS is constructed by analyzing the demand of the covered places of the passive DAS and combining the difference index and the test result of the passive DAS, the adaptability of the method is strong, and the coverage of the passive DAS to 5G is realized.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a schematic diagram of modification 1 of the present invention.
FIG. 3 is a schematic diagram of modification 2 of the present invention.
FIG. 4 is a schematic diagram of modification 3 of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, a 5G modification method based on a passive DAS includes the following steps:
in a specific embodiment, it is first determined whether the location of the passive DAS system uses a 3.5GHz or 4.9GHz band, if so, the system is not suitable for modification, and if not, the process goes to step S1.
S1: performing 5G coverage requirement analysis on a place covered by the passive DAS, defining the 5G coverage requirement of the place to be modified, acquiring a difference index of the passive DAS and the 5G coverage, and judging whether feeder line modification needs to be added according to the difference index;
more specifically, the difference index is whether a peak downloading experience of the 5G network needs to be obtained in a place where the passive DAS system is already covered, a feeder needs to be added if the peak downloading experience of the 5G network needs to be obtained, and the feeder does not need to be added if the peak downloading experience of the 5G network does not need to be obtained.
In a specific embodiment, the added feed is a 2-way feed.
S2: testing the passive DAS, judging whether the output power of an antenna port meets the 5G requirement, if the output power of the antenna port meets the 5G requirement, the antenna does not need to be replaced, and if the output power of the antenna port does not meet the 5G requirement, the antenna is replaced;
more specifically, the test of the passive DAS system includes the following test indexes: standing wave ratio, antenna output power, and the standing wave ratio. The method for testing the standing-wave ratio comprises the steps of disconnecting the combiner and the indoor distribution system, then using the standing-wave ratio tester as a signal source to access the indoor distribution system, setting the frequency band of the signal source to be 2.6GHz frequency band in 5G room, and measuring to obtain the standing-wave ratio smaller than 1.5.
And testing the output power of the antenna, using a standing-wave ratio tester to output signals of a 4G E frequency point and a 5G 2.6GHz frequency point respectively, using a frequency spectrograph to add and connect the antenna to receive at the antenna port, measuring and recording the power values of the received 2 frequency points for comparison. Whether the output power of the antenna of the passive DAS meets the requirement of a 5G network or not can be roughly judged according to the measured signal power difference value. The difference between the attenuation intensity of the 5G 2.6GHz signal and the attenuation intensity of the 4G E frequency band is kept within 3dB, and the requirement is met.
S3: setting a modification scheme according to the judgment result of the step S1 and the judgment result of the step S2;
more specifically, if it is determined in step S1 that the feeder needs to be added and the antenna does not need to be replaced in step S2, the modification scheme 1 is set;
if the step S1 determines that the feeder needs to be added and the antenna needs to be replaced in the step S2, the modification scheme 3 is set;
if the step S1 determines that the feeder is not required to be added and the antenna needs to be replaced in the step S2, the modification 2 is set.
S4: and modifying the passive DAS according to a set modification scheme.
The following description is made in conjunction with specific modification examples
Modification scheme 1
As shown in fig. 2, adaptation 1 of the present invention requires the capability of multiple antennas to address the 5G peak download rate. After the original passive DAS system is transformed in a 4G room, double-current transmission can be supported, and two feeder lines are provided. Terminals that achieve 5G peak download require support for the multi-antenna function of 2T 4R. To achieve the 5G download peak, the modified wireless DAS system is required to support the 4T4R configuration. In the first scheme, a passive DAS system needs to be modified by a feeder line, and two feeder lines are added to meet the requirement of 4T4R of 5G.
Modification scheme 2
As shown in fig. 3, in the modification scheme 2 of the present invention, the requirement of the user in the coverage scenario of the original passive DAS system on the download rate is not high, and the user does not need to support the multi-antenna mode of 4T4R, but only needs to support 1T1R and 2T 2R. After the original passive DAS system is transformed in a 4G room, double-current transmission can be supported, the requirements of 1T1R and 2T2R of 5G can be met, and feeder lines and interfaces do not need to be added.
The transformation scheme aims to solve the problem of insufficient power of an antenna port. The attenuation intensity of the signal of 5G 2.6GHz is larger than that of the 4G E frequency band, and according to the link budget, if the difference exceeds 3dBm, the transmission power needs to be enhanced. The passive DAS system is not provided with a power amplifier, and the problem of insufficient transmitting power is solved by adopting a mode of replacing a high-gain antenna.
Modification scheme 3
As shown in fig. 4, modification 3 of the present invention is a combination of modification 1 and modification 2, that is, it solves the requirement for multi-antenna capability of 5G network 4T4R and also solves the problem of insufficient antenna port power.
It should be noted that, a 5G application scenario is analyzed, and the requirement characteristics of the application scenario are used to determine a more appropriate scheme for the passive DAS in the application scenario.
Eight application scenes for Chinese IMT-2020(5G) push group division comprise: 1. an office; 2. a dense residential area; 3. a stadium; 4. an open air gathering; 5. a subway; 6. a fast way; 7. high-speed rail; 8. wide area coverage.
The passive DAS system basically does not exist in the application scenes of open-air meetings, expressways and wide-area coverage, the high-speed rail scene mainly comprises a high-speed rail carriage, the passive DAS system does not exist, and the characteristics of the high-speed rail station are similar to those of a stadium and can be attributed to the stadium. 4. Scenes 6, 7, 8 are not analyzed in this patent.
The technical index parameters closely related to 5G are flow density, time delay and user experience rate, and the formulas of the three indexes are as follows:
(1) flow density ═ sigma active terminal density × service i occurrence probability × service i experience rate
Wherein: 5G activation termination density-population density × 5G termination permeability × 5G termination activation rate
(2) The delay requirement needs to meet the requirement of the service with the highest delay requirement, and the calculation formula is as follows:
scene a delay MIN { service delay }
(3) The user experience rate requirement needs to meet the requirement of the service with the highest user experience rate requirement, and the calculation formula is as follows:
scenario a user experience rate MAX { service experience rate }
Further analyzing the characteristics of other 4 scenes:
an office area: typical services in an office area include video sessions, cloud desktops, data downloads, cloud storage, OTT messages, and the like. The 5G users in the office area have ultrahigh density, the typical service experience rate is extremely high, and dozens of Tbit/km can be generated in the application scene2The ultra-high flux density of (2). Office scenario business scenario as shown in table 1:
TABLE 1 office Scenario Business case
Dense residential areas: typical services include video sessions, video playback, virtual reality, online gaming, data download, cloud storage, OTT messaging, smart home, and the like. The 5G users in the dense residential area have ultrahigh density, which is required to reach the Gbit/s typical service experience rate, and will generate ultrahigh traffic density, as shown in table 2, which is the scene service situation of the dense residential area.
TABLE 2 dense residential scene Business case
A stadium: the stadium is characterized in that a large number of people are gathered in a small area, and the population density is extremely high. The movie service includes video playing, augmented reality, video live broadcasting, high-definition picture uploading, OTT message and the like. The 5G users in the stadium have ultrahigh density and high movie service experience rate, and the stadium scene service situation is shown in table 3.
TABLE 3 Stadium scene service scenarios
Subway: groundA large number of people are gathered in the iron, the population density is extremely high, and typical services comprise video playing, online games and OTT messages. Typical service experience rate requirements are general, and user density reaches 6 persons/m2Denoted as subway scene traffic.
TABLE 4 subway scene service conditions
According to the analysis of the scene experience rate, the experience rate of offices and dense residential areas is high in requirement, and the modified DAS system is required to support 4T 4R; the experience rate of the stadium and the subway is required to be 60Mbit/s, and the 2T2R can be supported, and as shown in Table 5, the passive DAS 5G modification scheme is selected for each application scene.
Table 5 selection of passive DAS system 5G modification scheme for each application scenario.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A5G reconstruction method based on a passive DAS is characterized by comprising the following steps:
s1: performing 5G coverage requirement analysis on a place covered by the passive DAS to obtain a difference index of the passive DAS and the 5G coverage, and judging whether feeder line improvement needs to be performed or not according to the difference index;
s2: testing the passive DAS, judging whether the output power of an antenna port meets the 5G requirement, if the output power of the antenna port meets the 5G requirement, the antenna does not need to be replaced, and if the output power of the antenna port does not meet the 5G requirement, the antenna is replaced;
s3: setting a modification scheme according to the judgment result of the step S1 and the judgment result of the step S2;
s4: and modifying the passive DAS according to a set modification scheme.
2. The passive DAS-based 5G modification method of claim 1, wherein the step S1 of determining whether additional feeder line modification is required according to the difference indicator specifically includes:
the difference index is whether the peak downloading experience of the 5G network needs to be obtained in a place covered by the passive DAS, if the peak downloading experience of the 5G network needs to be obtained, a feeder line needs to be added, and if the peak downloading experience of the 5G network does not need to be obtained, the feeder line does not need to be added.
3. The passive DAS-based 5G modification method of any one of claims 1-2, wherein the step S3, according to the determination result of step S1 and the determination result of step S2, sets a modification scheme specifically as follows: if the step S1 determines that the feeder needs to be added and the antenna does not need to be replaced in the step S2, the modification scheme 1 is set;
if the step S1 determines that the feeder needs to be added and the antenna needs to be replaced in the step S2, the modification scheme 3 is set;
if the step S1 determines that the feeder is not required to be added and the antenna needs to be replaced in the step S2, the modification 2 is set.
4. The passive DAS-based 5G modification method of claim 1, wherein in step S2, the passive DAS system is tested, and the test criteria include: standing wave ratio, antenna output power.
5. The passive DAS-based 5G modification method of claim 4, wherein a standing-wave ratio tester is used as a signal source for the standing-wave ratio test, and the frequency band of the signal source is set to 2.6GHz at a 5G room.
6. The passive DAS-based 5G modification method of claim 4, wherein a standing wave ratio tester is used to test output power of the antenna to output signals of a 4G E frequency point and a 5G 2.6GHz frequency point, respectively.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883334A (en) * | 2011-07-13 | 2013-01-16 | 工业和信息化部电信研究院 | Planning method of LTE indoor distribution system and device for determining planning parameters |
| CN110278011A (en) * | 2019-06-12 | 2019-09-24 | 京信通信系统（中国）有限公司 | Distributing antenna system, method and apparatus |
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- 2019-12-24 CN CN201911350515.3A patent/CN111182559A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883334A (en) * | 2011-07-13 | 2013-01-16 | 工业和信息化部电信研究院 | Planning method of LTE indoor distribution system and device for determining planning parameters |
| CN110278011A (en) * | 2019-06-12 | 2019-09-24 | 京信通信系统（中国）有限公司 | Distributing antenna system, method and apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 黄海晖; 刘大洋: "5G时代室内覆盖解决方案综述", 《CNKI-移动通信》 * |
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Application publication date: 20200519 |