Method and system for carrying out 5G split-level MIMO transformation on traditional indoor distribution

Abstract

The invention discloses a method and system for performing 5G staggered-layer MIMO transformation on traditional indoor distribution, and belongs to the technical field of communication, and the method comprises the steps: for a single-flow distribution system, transforming an original trunk to enable the original trunk to form two paths of parallel trunks; split-level MIMO transformation is carried out for a flat-level coverage scheme, and the stereo MIMO effect of antenna joint transmission between the upper floor and the lower floor is achieved through an odd-even floor vertical face split-level coverage scheme. The problem of no 5G indoor coverage is solved, meanwhile, the existing investment is protected to the maximum extent, the construction period is shortened, and therefore the purposes of reducing cost and improving efficiency of operators are achieved.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and specifically to a method and system for transforming traditional indoor distribution into 5G staggered-layer MIMO. Background Art

[0002] As far as the current mobile communication construction is concerned, 5G communication is the most mainstream communication technology and the core support force for the construction of the entire information society. For operators, providing 5G network coverage for high-value customers is the key to improving user satisfaction and expanding economic benefits. The 5G indoor distribution system has different construction methods in combination with different demand scenarios. The commonly used construction methods are traditional DAS distribution system and distributed skin station digital distribution system. Since a large number of 2 / 3 / 4G traditional DAS indoor distribution systems have been deployed in the existing network, 5G has the advantages of low transformation cost and rapid introduction of 5G signals by directly combining the existing DAS distribution system. However, 90% of the traditional indoor distribution systems in the existing network are single-channel systems. After 5G combining, the single-stream system has obvious disadvantages in user rate, cannot play the advantages of 5G, and is difficult to meet the business needs of high-speed scenarios. If a new antenna feeder is added to transform the dual-channel, it will not only be expensive, but also have long construction period, difficult construction, and difficult property coordination. How to give full play to the existing advantages and protect existing investments in the construction of 5G indoor distribution is an issue that needs to be considered in the construction of 5G indoor distribution. Summary of the invention

[0003] The technical task of the present invention is to address the above shortcomings and provide a method and system for transforming traditional indoor distribution into 5G staggered MIMO, which solves the problem of no 5G indoor coverage, while protecting existing investments to the greatest extent and shortening the construction period, thereby achieving the goal of reducing costs and increasing efficiency for operators.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A method for transforming a traditional indoor distribution system into a 5G split-layer MIMO system, comprising:

[0006] For the single-flow distribution system, the original trunk is transformed to form two parallel trunks;

[0007] A staggered-layer MIMO transformation is carried out for the flat-floor coverage solution, and a three-dimensional MIMO effect of joint transmission of antennas between upper and lower floors is achieved through a staggered-layer coverage solution on the vertical planes of odd and even floors.

[0008] This method directly combines the existing 2 / 3 / 4G traditional DAS distribution system to quickly introduce 5G dual-stream indoor signals. Based on the original single-channel DAS, this method proposes a traditional indoor 5G staggered-layer MIMO transformation method to achieve MIMO dual-stream effects, reduce costs and increase efficiency, improve experience rate, solve the problem of no 5G indoor coverage, protect existing investments to the greatest extent, shorten the construction period, and achieve the operator's goal of reducing costs and increasing efficiency.

[0009] Furthermore, the different channels of an RRU of the original 2 / 4G single-stream distribution system are used for joint reception and transmission, the feeder connection method is modified, and the distribution systems on odd and even floors are respectively connected to different channels of the 5G RRU signal source. The traditional DAS indoor distribution system has the ability to receive and transmit multiple antennas through joint transmission between antennas on upper and lower floors, thereby generating dual-stream gain.

[0010] Furthermore, by adding a combiner, two parallel trunks are formed, which are respectively connected to the A port and B port of the 5G RRU RF output port to form staggered coverage.

[0011] Furthermore, for the construction of a traditional single-channel 2 / 4G combined indoor distribution, two RRUs are used to cover the west and east sides of B1F-5F, using only one channel;

[0012] Add a combiner, feeder and connector materials to form two parallel trunks, which are connected to the A port and B port of the 5G RRU RF output port respectively, covering B1, 2, 4 and 1, 3, 5 layers respectively, forming staggered coverage.

[0013] Furthermore, the indoor wireless propagation model is as follows:

[0014] Indoor propagation path loss = 32.34 + 20log (d / km) + 20log (f / MHz) + 10*n*log (d / d0) + R, where f is the signal frequency, n is the attenuation factor, and R is the penetration loss;

[0015] The indoor wireless propagation model and the penetration loss caused by different materials are combined to analyze the propagation loss in different scenarios.

[0016] Furthermore, the dual-channel power difference is within 30dB.

[0017] The present invention also claims protection for a 5G indoor distribution system, which performs 5G staggered MIMO transformation on traditional indoor distribution, including:

[0018] For the single-flow distribution system, the original trunk is transformed to form two parallel trunks;

[0019] A staggered-layer MIMO transformation is carried out for the flat-floor coverage solution, and a three-dimensional MIMO effect of joint transmission of antennas between upper and lower floors is achieved through a staggered-layer coverage solution on the vertical planes of odd and even floors.

[0020] Furthermore, the different channels of an RRU of the original 2 / 4G single-stream distribution system are used for joint reception and transmission, the feeder connection method is modified, and the distribution systems on odd and even floors are respectively connected to different channels of the 5G RRU signal source. The traditional DAS indoor distribution system has the ability to receive and transmit multiple antennas through joint transmission between antennas on upper and lower floors, thereby generating dual-stream gain.

[0021] Furthermore, by adding a combiner, two parallel trunks are formed, which are connected to the A port and B port of the 5G RRU RF output port respectively, forming staggered coverage.

[0022] Furthermore, the indoor wireless propagation model is as follows:

[0023] Indoor propagation path loss = 32.34 + 20log (d / km) + 20log (f / MHz) + 10*n*log (d / d0) + R, where f is the signal frequency, n is the attenuation factor, and R is the penetration loss;

[0024] Combined with the indoor wireless propagation model and the penetration loss caused by different materials, the propagation loss in different scenarios is analyzed;

[0025] The power difference between the two channels is within 30dB.

[0026] Compared with the prior art, the method and system of the present invention for transforming the traditional indoor division into 5G staggered MIMO has the following beneficial effects:

[0027] The present invention transforms the existing 2 / 3 / 4G indoor network by using the staggered MIMO method and quickly introduces 5G dual-stream signals, which not only protects the original investment, but also reduces the investment in new skin sites, shortens the construction period, and ensures the maximization of 5G investment benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of a staggered room division scheme provided by an embodiment of the present invention;

[0029] Figure 2 This is a graph showing a vertex RANK test under different power differences of dual channels provided by an embodiment of the present invention;

[0030] Figure 3 It is a diagram showing the implementation of feeder line transformation of a split-level indoor distribution system provided by an embodiment of the present invention;

[0031] Figure 4 It is a diagram showing the implementation of feeder line reconstruction of a staggered-level indoor distribution system in an office building provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] A method to transform traditional indoor distribution into 5G staggered MIMO, directly combining the existing 2 / 3 / 4G traditional DAS distribution system, quickly introducing 5G dual-stream indoor distribution signals, and solving the problem of no 5G coverage indoors.

[0034] This method analyzes the MIMO principle, indoor propagation model, and performance impact verification to develop a solution for transforming 2 / 3 / 4G traditional indoor distribution into 5G split-layer MIMO. The specific steps are as follows:

[0035] 1. MIMO principle analysis:

[0036] The MIMO principle is that the transmitting end sends signals independently through multiple antennas, and the receiving end uses multiple antennas to receive signals at the same time. By sending and receiving multiple spatial streams, the user rate is multiplied. The antennas in the existing DAS system are mainly omnidirectional ceiling antennas. In the vertical plane, the main lobe wireless signal of the omnidirectional ceiling antenna radiates to the next floor by penetrating the floor. At the same time, because the omnidirectional ceiling antenna is relatively small in front and back, the wireless signal of the omnidirectional ceiling antenna penetrates the ceiling to the upper floor. For the original single-stream distribution system, this method transforms the original trunk to form two parallel trunks. Figure 1 As shown in the figure, the staggered-layer coverage scheme is a staggered-layer MIMO transformation of the original flat-layer coverage scheme, and a three-dimensional MIMO effect of joint transmission of antennas between upper and lower floors is achieved through the staggered-layer coverage scheme on the vertical planes of odd and even floors.

[0037] 2. Indoor propagation model:

[0038] Based on a lot of practical experience and data summary, the indoor wireless propagation model is as follows:

[0039] Indoor propagation path loss (dB) = 32.34 + 20log (d / km) + 20log (f / MHz) + 10*n*log (d / d0) + R, where f is the signal frequency, n is the attenuation factor, and R is the penetration loss;

[0040] Different materials such as floors, partitions, and walls cause different additional losses. The propagation losses at different frequencies and materials are shown in Table 1.

[0041] Table 1 Penetration loss in different frequency bands under different materials

[0042] Penetration loss(dB) Reinforced concrete / blocking Brick-concrete exterior wall / blocking Metal ceiling / layer Interior partition / blocking Glass curtain wall / sash 1.8GHz 20 11 15 11 9 2.3GHz 22 14 16 12 10 2.6GHz 24 15 17 13 11 3.5GHz 27 19 20 14 13

[0043] According to the above analysis, the floor penetration loss is about 15-30dB, and the difference in propagation loss between the terminal and the upper and lower antennas is about 8dB. In theory, the difference in receiving field strength of the terminal with staggered coverage is about 20-35dB. For some office buildings, hotels and other scenes with relatively open floors, the difference in signal field strength between the terminal receiving the current floor and other floors in the open area will be smaller, and the difference is expected to be about 10-15dB, which can obtain higher dual-stream gain.

[0044] 3. Performance impact verification:

[0045] Considering the unbalanced power of dual channels, the MIMO capability was tested and verified. The verification showed that the power difference of dual channels was between 0 and 30 dBm. Combined with the average number of channels accessed by the terminal (RANK), the staggered layer dual-stream solution was verified. Figure 2 shown.

[0046] According to the test results, as the imbalance difference of dual-stream channels increases, the number of RANKs under MIMO gradually decreases. When the dual-channel power difference under the staggered dual-stream solution is below 25dBm, the average terminal access RANK number basically remains at 2, and begins to decline significantly at 30dBm. Therefore, it is recommended that the dual-channel power difference of the traditional indoor 5G staggered-layer MIMO transformation solution be within 30dB.

[0047] 4. Carry out transformation:

[0048] The 5G indoor split-layer MIMO solution uses different channels of an RRU of the original 4G single-stream distribution system for joint reception and transmission, simply transforms the feeder connection method, connects the odd and even floor distribution systems to different channels of the 5G RRU signal source, and uses the traditional DAS indoor distribution system with multi-antenna transmission and reception capabilities through joint transmission between upper and lower floor antennas, generating dual-stream gain. The transformation requires very few materials (feeders, combiners, connectors and other auxiliary materials are sufficient), the process is simple, and the transformation cost is low. Figure 3 shown.

[0049] like Figure 4 As shown in the figure, in an office building, the existing network is a traditional single-channel 2 / 4G combined indoor distribution, using two RRUs to cover the west and east sides of B1F-5F, using only one channel. The split-layer MIMO transformation plan is as follows: the system backbone is transformed, and a combiner, feeder, connector and other materials are added to form two parallel backbones, which are connected to the A port and B port of the 5G RRU RF output port, respectively, covering B1, 2, 4 and 1, 3, 5 floors, forming split-layer coverage.

[0050] Compared with the traditional combined access solution, the staggered-layer MIMO solution has lower cost and higher efficiency, and can quickly improve the 5G user experience rate.

[0051] Table 2: Comparison of access and effect between traditional combining and staggered solutions

[0052]

[0053] The staggered MIMO solution can achieve coverage similar to that of 5G distributed skin base stations. At the same time, it can make full use of the existing indoor distribution system of the existing 2G / 3G / 4G network to maximize 5G performance, protect old investments to the greatest extent, reduce investment in new distributed skin base stations, and shorten the construction period of 5G indoor distribution system coverage projects.

[0054] This method uses the 5G staggered-layer MIMO method to directly combine the existing 2 / 3 / 4G traditional DAS distribution system, quickly introduce 5G dual-stream indoor signals, and solve the problem of no 5G network coverage indoors. Through the analysis of the MIMO dual-stream principle, the analysis of the indoor propagation model, and the verification of the performance impact, a 5G indoor staggered-layer MIMO solution was developed. The solution mainly transforms the feeder, combiner, and connector of the trunk line to achieve a coverage effect close to that achieved by the 5G distributed skin base station, while maximizing the protection of the original investment, reducing the investment in new distributed skin base stations, shortening the construction period of the 5G indoor distribution system coverage project, and quickly improving the operator's 5G network coverage effect to meet the user's Internet experience. The benefits generated are as follows:

[0055] Cost-effectiveness:

[0056] The investment in staggered-layer MIMO transformation is mainly concentrated in the antenna and feeder parts at the branch level. The transformation plan basically only involves the transformation of the trunk. Compared with other construction methods, the construction cost is only 2.79% of the original indoor transformation, which can maximize cost reduction and efficiency improvement and the best investment return ratio.

[0057] Table 3 Renovation cost comparison table

[0058] Transformation method Renovation cost (yuan) Rate increase Independent new construction 92410 70％～95％ Renovation of the original room 43000 70％～90％ MIMO frequency shifting 38000 65％～85％ Split-layer MIMO 1200 62％～91％

[0059] Time benefit:

[0060] Rebuilding antennas and feeders for existing indoor distribution networks is very difficult to coordinate, has great construction safety risks, and requires a long reconstruction cycle. However, the staggered-layer MIMO solution performs trunk transformation only within the weak-current well, has low coordination difficulty, high feasibility, can be rapidly implemented, and has a short implementation cycle, which can improve 5G performance in the short term.

[0061] Table 4 Comparison of time consumption for renovation construction

[0062]

[0063] Network benefits:

[0064] After the staggered MIMO backbone transformation of the existing indoor distribution, the original 2 / 3 / 4G network and 5G share the antenna and feeder, which can enable the 4G network to also have a dual-stream effect, improving the user's Internet experience.

[0065] The present invention also claims protection for a 5G indoor distribution system, which performs 5G staggered MIMO transformation on traditional indoor distribution, including:

[0066] For a single-flow distribution system, the original trunk is transformed to form two parallel trunks; Figure 1 As shown in the figure, the staggered-layer coverage scheme is a staggered-layer MIMO transformation of the original flat-layer coverage scheme, and a three-dimensional MIMO effect of joint transmission of antennas between upper and lower floors is achieved through the staggered-layer coverage scheme on the vertical planes of odd and even floors.

[0067] A staggered-layer MIMO transformation is carried out for the flat-floor coverage solution, and a three-dimensional MIMO effect of joint transmission of antennas between upper and lower floors is achieved through a staggered-layer coverage solution on the vertical planes of odd and even floors.

[0068] The different channels of an RRU of the original 2 / 4G single-stream distribution system are used for joint reception and transmission. The feeder connection method is modified, and the distribution systems on odd and even floors are respectively connected to different channels of the 5G RRU signal source. The traditional DAS indoor distribution system has the ability to receive and transmit multiple antennas through joint transmission between antennas on upper and lower floors, thereby generating dual-stream gain.

[0069] Based on a lot of practical experience and data summary, the indoor wireless propagation model is as follows:

[0070] Indoor propagation path loss (dB) = 32.34 + 20log (d / km) + 20log (f / MHz) + 10*n*log (d / d0) + R, where f is the signal frequency, n is the attenuation factor, and R is the penetration loss;

[0071] Different materials such as floors, partitions, and walls cause different additional losses. The propagation losses at different frequencies and materials are shown in Table 1.

[0072] Table 1 Penetration loss in different frequency bands under different materials

[0073] Penetration loss(dB) Reinforced concrete / blocking Brick-concrete exterior wall / blocking Metal ceiling / layer Indoor partition / blocking Glass curtain wall / sash 1.8GHz 20 11 15 11 9 2.3GHz 22 14 16 12 10 2.6GHz 24 15 17 13 11 3.5GHz 27 19 20 14 13

[0074] According to the above analysis, the floor penetration loss is about 15-30dB, and the difference in propagation loss between the terminal and the upper and lower antennas is about 8dB. In theory, the difference in receiving field strength of the terminal with staggered coverage is about 20-35dB. For some office buildings, hotels and other scenes with relatively open floors, the difference in signal field strength between the terminal receiving the current floor and other floors in the open area will be smaller, and the difference is expected to be about 10-15dB, which can obtain higher dual-stream gain.

[0075] Considering the unbalanced power of dual channels, the MIMO capability was tested and verified. The verification showed that the power difference of dual channels was between 0 and 30 dBm. Combined with the average number of channels accessed by the terminal (RANK), the staggered layer dual-stream solution was verified. Figure 2 shown.

[0076] According to the test results, as the imbalance difference of dual-stream channels increases, the number of RANKs under MIMO gradually decreases. When the dual-channel power difference under the staggered dual-stream solution is below 25dBm, the average terminal access RANK number basically remains at 2, and begins to decline significantly at 30dBm. Therefore, it is recommended that the dual-channel power difference of the traditional indoor 5G staggered-layer MIMO transformation solution be within 30dB.

[0077] The 5G indoor split-layer MIMO solution uses different channels of an RRU of the original 4G single-stream distribution system for joint reception and transmission, simply transforms the feeder connection method, connects the odd and even floor distribution systems to different channels of the 5G RRU signal source, and uses the traditional DAS indoor distribution system with multi-antenna transmission and reception capabilities through joint transmission between upper and lower floor antennas, generating dual-stream gain. The transformation requires very few materials (feeders, combiners, connectors and other auxiliary materials are sufficient), the process is simple, and the transformation cost is low. Figure 4 As shown in the figure, in an office building, the existing network is a traditional single-channel 2 / 4G combined indoor distribution, using two RRUs to cover the west and east sides of B1F-5F, using only one channel. The split-layer MIMO transformation plan is as follows: the system backbone is transformed, and a combiner, feeder, connector and other materials are added to form two parallel backbones, which are connected to the A port and B port of the 5G RRU RF output port, respectively, covering B1, 2, 4 and 1, 3, 5 floors, forming split-layer coverage.

[0078] Through the above specific implementations, those skilled in the art can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific implementations. On the basis of the disclosed implementations, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions.

[0079] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

Claims

1. A method for transforming traditional indoor distribution into 5G staggered MIMO, characterized in that: include: For the single-flow distribution system, the original trunk is transformed to form two parallel trunks; A staggered-layer MIMO transformation is carried out for the flat-floor coverage solution, and a three-dimensional MIMO effect of joint transmission of antennas between upper and lower floors is achieved through a staggered-layer coverage solution on the vertical planes of odd and even floors.

2. According to claim 1, a method for transforming traditional indoor division into 5G staggered MIMO is characterized in that: The different channels of an RRU of the original 2 / 4G single-stream distribution system are used for joint reception and transmission. The feeder connection method is modified, and the distribution systems on odd and even floors are respectively connected to different channels of the 5G RRU signal source. The traditional DAS indoor distribution system has the ability to receive and transmit multiple antennas through joint transmission between antennas on upper and lower floors, thereby generating dual-stream gain.

3. According to claim 2, a method for transforming traditional indoor division into 5G staggered MIMO is characterized in that: By adding a combiner, two parallel trunks are formed, which are respectively connected to the A port and B port of the 5G RRU RF output port to form staggered coverage.

4. According to claim 3, a method for transforming traditional indoor division into 5G staggered MIMO is characterized in that: For the construction of traditional single-channel 2 / 4G combined indoor distribution, two RRUs are used to cover the west and east sides of B1F-5F, and only one channel is used; Add a combiner, feeder and connector materials to form two parallel trunks, which are connected to the A port and B port of the 5G RRU RF output port respectively, covering B1, 2, 4 and 1, 3, 5 layers respectively, forming staggered coverage.

5. According to claim 1, a method for transforming traditional indoor division into 5G staggered MIMO is characterized in that: The indoor wireless propagation model is as follows: Indoor propagation path loss = 32.34 + 20log (d / km) + 20log (f / MHz) + 10*n*log (d / d0) + R, where f is the signal frequency, n is the attenuation factor, and R is the penetration loss; The indoor wireless propagation model and the penetration loss caused by different materials are combined to analyze the propagation loss in different scenarios.

6. A method for transforming a traditional indoor network into a 5G staggered MIMO network according to claim 1 or 5, characterized in that: The power difference between the two channels is within 30dB.

7. A 5G indoor distribution system, characterized in that: The system transforms traditional indoor distribution into 5G split-layer MIMO, including: For the single-flow distribution system, the original trunk is transformed to form two parallel trunks; A staggered-layer MIMO transformation is carried out for the flat-floor coverage solution, and a three-dimensional MIMO effect of joint transmission of antennas between upper and lower floors is achieved through a staggered-layer coverage solution on the vertical planes of odd and even floors.

8. A 5G indoor distribution system according to claim 7, characterized in that: The different channels of an RRU of the original 2 / 4G single-stream distribution system are used for joint reception and transmission. The feeder connection method is modified, and the distribution systems on odd and even floors are respectively connected to different channels of the 5G RRU signal source. The traditional DAS indoor distribution system has the ability to receive and transmit multiple antennas through joint transmission between antennas on upper and lower floors, thereby generating dual-stream gain.

9. A 5G indoor distribution system according to claim 7, characterized in that: By adding a combiner, two parallel trunks are formed, which are respectively connected to the A port and B port of the 5G RRU RF output port to form staggered coverage.

10. A 5G indoor distribution system according to claim 7, characterized in that: The indoor wireless propagation model is as follows: Indoor propagation path loss = 32.34 + 20log (d / km) + 20log (f / MHz) + 10*n*log (d / d0) + R, where f is the signal frequency, n is the attenuation factor, and R is the penetration loss; Combined with the indoor wireless propagation model and the penetration loss caused by different materials, the propagation loss in different scenarios is analyzed; The power difference between the two channels is within 30dB.

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