A leaky cable MIMO coverage system and coverage method based on cross-RRU cooperation

Abstract

The application discloses a leaky cable MIMO coverage system and method based on cross-RRU cooperation, which comprises a first leaky cable and a second leaky cable laid along the longitudinal extension direction of space; a first radio remote unit coupled with the first end of the first leaky cable and the second leaky cable and radiating signals in a first coverage section; a second radio remote unit coupled with the second end of the first leaky cable and the second leaky cable and radiating signals in a second coverage section; the first coverage section and the second coverage section are configured to have an overlapping area with partial overlap; the first radio remote unit and the second radio remote unit are configured as the same logical cell, so that the terminal equipment located in the overlapping area can simultaneously receive and aggregate independent signals from each radio remote unit to form an equivalent multiple-input multiple-output channel. The application upgrades the existing two-way leaky cable system to equivalent 4T4R or even 8T8R, significantly improves the spectrum efficiency and downlink rate, and realizes truly uninterrupted continuous high-quality coverage.

Description

Technical Field

[0001] This invention belongs to the field of leaky cable technology, specifically relating to a leaky cable MIMO coverage system and method based on cross-RRU collaboration. Background Technology

[0002] Leaky coaxial cable (hereinafter referred to as leaky cable) is a comprehensive cable that combines signal transmission, transmission and reception functions. It has both the transmission characteristics of coaxial cable and the radiation capability of antenna. It is mainly suitable for wireless coverage in narrow and enclosed scenarios such as tunnels, mines, and subways.

[0003] With the launch of the "Signal Upgrade" initiative, achieving deep 5G coverage and capacity enhancement in scenarios such as traffic tunnels and subways has become an urgent need. Leaky cable, due to its comprehensive characteristics of cable transmission and antenna radiation, has become the preferred solution for such scenarios.

[0004] However, traditional leaky cable MIMO solutions have significant shortcomings. To achieve MIMO multistream transmission such as 4T4R, existing technologies heavily rely on the hardware capabilities of a single remote radio unit (RRU), meaning a multi-channel RRU directly drives multiple parallel leaky cables, requiring sufficient spatial distance between the leaky cables to achieve signal isolation. However, in tunnels with extremely limited space, it is difficult to meet the isolation requirements, resulting in high channel correlation, severely limited MIMO capacity, and an inability to achieve true multistream transmission.

[0005] Furthermore, tunnel coverage typically requires multiple RRUs to segment the network, with only handover considerations between adjacent RRU coverage areas; their signals are treated as interference rather than as usable resources that can be aggregated. This "single-point driven, independent" architecture fundamentally limits the ceiling of MIMO stream counts in tunnel scenarios. Overcoming hardware and spatial limitations to achieve higher-order MIMO with limited resources is a pressing challenge for the industry. Summary of the Invention

[0006] To address the problems in the prior art, the present invention aims to provide a leaky MIMO coverage system and method based on cross-RRU collaboration, which utilizes the collaborative coverage of multiple RRUs to achieve a system-level multiplication of MIMO streams.

[0007] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows: A leaky cable MIMO coverage system based on cross-RRU cooperation for use in tunnels or narrow spaces includes: The first and second perforated cables are laid along the longitudinal extension direction of the space; The first radio frequency remote unit is coupled to the first end of the first and second leaky cables and radiates signals within the first coverage section. The second radio frequency remote unit is coupled to the second end of the first and second leaky cables and radiates signals within the second coverage section. The first coverage segment and the second coverage segment are configured to have overlapping areas that partially overlap. The first radio frequency remote unit and the second radio frequency remote unit are configured as the same logical cell, so that terminal devices located in the overlapping area can simultaneously receive and aggregate independent signals from the first radio frequency remote unit and the second radio frequency remote unit to form an equivalent multiple input multiple output channel. The number of layers of the equivalent multiple input multiple output channel is greater than the number of channel layers provided by either radio frequency remote unit on the first leaky cable or the second leaky cable.

[0008] Furthermore, both the first and second leaky cables are spread spectrum leaky cables adapted to the 4.9 GHz band; both the first and second radio frequency remote units are configured as N-channel radio frequency remote units and operate in M ​​transmit / R receive mode, where N and M are integers greater than or equal to 2, and M ≤ N; the M radio frequency channels of each radio frequency remote unit are respectively fed into the first and second leaky cables; in the overlapping area, the terminal device can simultaneously receive a total of 2M independent signals from the two radio frequency remote units to form an equivalent 2M×R multiple input multiple output channel.

[0009] Furthermore, both the first and second radio frequency remote units are 8-channel radio frequency remote units and are configured in 4T4R mode; wherein, the two channels of each radio frequency remote unit are fed into the first and second leaky cables respectively; so that the terminal device located in the overlapping area can simultaneously receive 4 independent signals, forming an equivalent 4T4R multiple input multiple output channel.

[0010] Furthermore, it also includes a third and a fourth leaky cable laid parallel to the first and second leaky cables; the remaining two channels of the first radio frequency remote unit are coupled to one end of the third and fourth leaky cables respectively, and the remaining two channels of the second radio frequency remote unit are coupled to the other end of the third and fourth leaky cables respectively; so that the terminal device located in the overlapping area can simultaneously receive 8 independent signals, forming an equivalent 8T8R multiple input multiple output channel.

[0011] Furthermore, the first and second leaky cables are arranged alternately or vertically along both sides of the tunnel wall to reduce the spatial correlation of the signals fed into the same radio frequency remote unit.

[0012] Furthermore, the first and second coverage segments are arranged sequentially and periodically along the longitudinal extension direction to form a continuous equivalent high-order multiple-input multiple-output coverage band.

[0013] This invention also discloses a coverage method for a leaky MIMO coverage system based on cross-RRU cooperation, applicable to tunnels or narrow spaces, comprising the following steps: At least a first leaky cable and a second leaky cable shall be laid along the longitudinal extension direction of the space; At least two radio frequency channels of the first radio frequency remote unit are coupled to the first ends of the first leaky cable and the second leaky cable, respectively, to form a first coverage segment; At least two radio frequency channels of the second radio frequency remote unit are coupled to the second ends of the first leaky cable and the second leaky cable, respectively, to form a second coverage segment; Adjust the signal coverage range to create a partially overlapping area between the first and second coverage segments; The first radio remote unit and the second radio remote unit are combined and configured into the same logical cell; When the terminal device is located in the overlapping area, it simultaneously receives and aggregates independent signals from the first radio remote unit and the second radio remote unit to form an equivalent multiple input multiple output channel. The number of layers of the equivalent multiple input multiple output channel is greater than the number of channel layers provided by any radio remote unit on the first or second leaky cable alone, and no cell handover occurs when the terminal moves between the first coverage segment, the overlapping area and the second coverage segment.

[0014] Furthermore, both the first and second leaky cables are spread spectrum leaky cables adapted to the 4.9 GHz band; both the first and second radio frequency remote units are configured in an 8-channel 4T4R mode; the two channels of each radio frequency remote unit are fed into the first and second leaky cables respectively; so that in the overlapping area, the terminal device can achieve equivalent 4T4R multiple-input multiple-output transmission using two physical leaky cables.

[0015] Furthermore, it also includes the following steps: Lay the third and fourth leaky cables parallel to the first and second leaky cables; The remaining two channels of the first radio frequency remote unit are coupled to one end of the third and fourth leaky cables, respectively; The remaining two channels of the second radio frequency remote unit are coupled to the other ends of the third and fourth leaky cables, respectively; This allows the terminal device to achieve an equivalent 8T8R multiple-input multiple-output transmission using four physical leaky cables within the overlapping area.

[0016] Furthermore, when receiving and aggregating signals, the terminal device treats signals from different radio frequency remote units as multi-stream signals from the same cell and performs joint demodulation.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) Architectural Revolution, Breaking Limitations: For the first time, a brand-new network architecture of "cross-RRU collaborative MIMO" is proposed, which expands the MIMO implementation from "single-point hardware capability" to "system collaborative capability", breaking through the dual limitations of traditional single RRU multi-stream transmission and spatial isolation, and greatly liberating the MIMO design in tunnel scenarios; 2) Performance boost and superior coverage: With almost no additional hardware, the existing dual-path leaky cable system can be smoothly upgraded to an equivalent 4T4R or even 8T8R, significantly improving spectrum efficiency and downlink speed, and achieving truly uninterrupted continuous high-quality coverage. 3) Extremely high cost-effectiveness: Upgrading to high-order MIMO can be achieved entirely based on existing leaky cable and RRU equipment through software configuration and network optimization, resulting in extremely low overall retrofit costs. Compared to solutions requiring new leaky cables or antennas, both project timelines and material costs are significantly reduced. 4) Seamless switching and improved experience: The entire collaborative coverage area becomes a logical supercell, and no handover is required when the terminal moves, which eliminates the risk of handover lag and dropped calls from the root and ensures the continuity of high-speed data services. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the architecture of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the architecture of Embodiment 2 of the present invention. Detailed Implementation

[0019] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0020] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0021] like Figure 1-2 As shown, this invention discloses a leaky MIMO coverage system based on cross-RRU cooperation for use in tunnels or narrow spaces, comprising: The first and second perforated cables are laid along the longitudinal extension direction of the space; The first radio frequency remote unit is coupled to the first end of the first and second leaky cables and radiates signals within the first coverage section. The second radio frequency remote unit is coupled to the second end of the first and second leaky cables and radiates signals within the second coverage section. The first coverage segment and the second coverage segment are configured to have overlapping areas with partial overlap; The first radio frequency remote unit and the second radio frequency remote unit are configured as the same logical cell, so that terminal devices located in the overlapping area can simultaneously receive and aggregate independent signals from the first radio frequency remote unit and the second radio frequency remote unit to form an equivalent multiple input multiple output channel. The number of layers of the equivalent multiple input multiple output channel is greater than the number of channel layers provided by either radio frequency remote unit on the first leaky cable or the second leaky cable.

[0022] In some implementations, both the first and second leaky cables are spread spectrum leaky cables adapted to the 4.9 GHz band; both the first and second radio frequency remote units are configured as N-channel radio frequency remote units and operate in M ​​transmit / R receive mode, where N and M are integers greater than or equal to 2, and M ≤ N; the M radio frequency channels of each radio frequency remote unit are fed into the first and second leaky cables respectively; in the overlapping area, the terminal device can simultaneously receive a total of 2M independent signals from the two radio frequency remote units to form an equivalent 2M×R multiple-input multiple-output channel.

[0023] In some implementations, both the first and second radio frequency remote units are 8-channel radio frequency remote units and are configured in 4T4R mode; wherein, the two channels of each radio frequency remote unit are fed into the first and second leaky cables respectively; so that the terminal device located in the overlapping area can simultaneously receive four independent signals, forming an equivalent 4T4R multiple input multiple output channel.

[0024] In some other embodiments, the system of the present invention further includes a third and a fourth leaky cable laid parallel to the first and second leaky cables; the remaining two channels of the first radio frequency remote unit are coupled to one end of the third and fourth leaky cables respectively, and the remaining two channels of the second radio frequency remote unit are coupled to the other end of the third and fourth leaky cables respectively; so that the terminal device located in the overlapping area can simultaneously receive 8 independent signals, forming an equivalent 8T8R multiple input multiple output channel.

[0025] In some implementations, the first and second leaky cables are arranged alternately or vertically along both sides of the tunnel wall to reduce the spatial correlation of the signals fed into the same radio frequency remote unit.

[0026] In some implementations, the first and second coverage segments are arranged sequentially and periodically along the longitudinal extension direction to form a continuous equivalent high-order multiple-input multiple-output coverage band.

[0027] This invention also discloses a coverage method for a leaky MIMO coverage system based on cross-RRU cooperation, applicable to tunnels or narrow spaces, comprising the following steps: At least a first leaky cable and a second leaky cable shall be laid along the longitudinal extension direction of the space; At least two radio frequency channels of the first radio frequency remote unit are coupled to the first ends of the first leaky cable and the second leaky cable, respectively, to form a first coverage segment; At least two radio frequency channels of the second radio frequency remote unit are coupled to the second ends of the first leaky cable and the second leaky cable, respectively, to form a second coverage segment; Adjust the signal coverage range to create a partially overlapping area between the first and second coverage segments; The first radio remote unit and the second radio remote unit are combined and configured into the same logical cell; When the terminal device is located in the overlapping area, it simultaneously receives and aggregates independent signals from the first radio remote unit and the second radio remote unit to form an equivalent multiple input multiple output channel. The number of layers of the equivalent multiple input multiple output channel is greater than the number of channel layers provided by any radio remote unit on the first or second leaky cable alone, and no cell handover occurs when the terminal moves between the first coverage segment, the overlapping area and the second coverage segment.

[0028] In some implementations, both the first and second leaky cables are spread spectrum leaky cables adapted to the 4.9 GHz band; both the first and second radio frequency remote units are configured in an 8-channel 4T4R mode; the two channels of each radio frequency remote unit are fed into the first and second leaky cables respectively; so that in the overlapping area, the terminal device can achieve equivalent 4T4R multiple-input multiple-output transmission using two physical leaky cables.

[0029] In some implementations, the above method further includes the following steps: Lay the third and fourth leaky cables parallel to the first and second leaky cables; The remaining two channels of the first radio frequency remote unit are coupled to one end of the third and fourth leaky cables, respectively; The remaining two channels of the second radio frequency remote unit are coupled to the other ends of the third and fourth leaky cables, respectively; This allows the terminal device to achieve an equivalent 8T8R multiple-input multiple-output transmission using four physical leaky cables within the overlapping area.

[0030] In some implementations, when receiving and aggregating signals, the terminal device treats signals from different radio frequency remote units as multi-stream signals from the same cell and performs joint demodulation.

[0031] Example 1

[0032] like Figure 1As shown, a leaky MIMO coverage system based on cross-RRU collaboration includes: a first leaky cable and a second leaky cable laid along the longitudinal extension direction of the tunnel, both using spread spectrum leaky cables supporting the 4.9 GHz frequency band to reduce transmission loss. Both the first and second RRUs are 8-channel devices, each operating in 4T4R mode. Two channels of the first RRU are fed into the first and second leaky cables respectively, covering the first segment; the second RRU uses a completely symmetrical connection to cover the second segment. Through precise power control and link budget, a stable overlap area exists between the first and second coverage segments. On the network side, cell merging technology is used to set the logical cell identifiers of the first and second RRUs to be the same.

[0033] When the terminal enters the overlapping area, its receiver simultaneously detects two independent signals from the first RRU and two independent signals from the second RRU. Since both belong to the same logical cell, the terminal's baseband processing unit treats these two sets of signals as a whole four spatial streams, performs channel estimation and joint demodulation, thereby effectively realizing 4T4R MIMO transmission.

[0034] Actual testing showed that the RANK4 percentage in this area remained stable at over 90%, providing users with downlink speeds several times higher than traditional solutions. Terminal movement exhibited smooth gliding within continuous logical cells, with absolutely no handover interruptions.

[0035] This embodiment uses cell merging technology to logically aggregate radio frequency resources distributed at different physical points in space into a powerful virtual MIMO resource pool on the terminal side, thereby achieving the highest order MIMO effect with the least amount of physical cables.

[0036] Example 2

[0037] like Figure 2 As shown, this embodiment adds a third and fourth leaky cable in parallel with Embodiment 1. The remaining two channels of the first RRU are fed into one end of the third and fourth leaky cables, respectively, and the remaining two channels of the second RRU are fed into the other end of the third and fourth leaky cables, respectively. At this time, the eight physical channels of each RRU are fully utilized, providing four independent signals within their respective coverage areas. In the overlapping area, the terminal can simultaneously receive a total of eight independent signals from the two RRUs, aggregate and demodulate them, and achieve equivalent 8T8R MIMO transmission.

[0038] This embodiment increases the overall MIMO capacity of the system linearly or even exponentially by adding cooperative radio frequency points, rather than simply increasing the number of single-point channels, providing a clear and low-cost path for future evolution to higher-order MIMO.

[0039] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A leaky cable MIMO coverage system based on cross-RRU cooperation for use in tunnels or narrow spaces, characterized in that, include: The first and second perforated cables are laid along the longitudinal extension direction of the space; The first radio frequency remote unit is coupled to the first end of the first and second leaky cables and radiates signals within the first coverage section. The second radio frequency remote unit is coupled to the second end of the first and second leaky cables and radiates signals within the second coverage section. The first coverage segment and the second coverage segment are configured to have overlapping areas that partially overlap. The first radio frequency remote unit and the second radio frequency remote unit are configured as the same logical cell, so that terminal devices located in the overlapping area can simultaneously receive and aggregate independent signals from the first radio frequency remote unit and the second radio frequency remote unit to form an equivalent multiple input multiple output channel. The number of layers of the equivalent multiple input multiple output channel is greater than the number of channel layers provided by either radio frequency remote unit on the first leaky cable or the second leaky cable.

2. The leaky cable MIMO coverage system based on cross-RRU collaboration according to claim 1, characterized in that, Both the first and second leaky cables are spread spectrum leaky cables adapted to the 4.9 GHz band; both the first and second radio frequency remote units are configured as N-channel radio frequency remote units and operate in M ​​transmit / R receive mode, where N and M are integers greater than or equal to 2, and M ≤ N; the M radio frequency channels of each radio frequency remote unit are fed into the first and second leaky cables respectively; in the overlapping area, the terminal device can simultaneously receive a total of 2M independent signals from the two radio frequency remote units to form an equivalent 2M×R multiple input multiple output channel.

3. A leaky cable MIMO coverage system based on cross-RRU collaboration according to claim 1, characterized in that, Both the first and second radio frequency remote units are 8-channel radio frequency remote units and are configured in 4T4R mode. The two channels of each radio frequency remote unit are fed into the first and second leaky cables, respectively, so that the terminal device located in the overlapping area can receive four independent signals at the same time, forming an equivalent 4T4R multiple input multiple output channel.

4. A leaky MIMO coverage system based on cross-RRU collaboration according to claim 3, characterized in that, It also includes a third and a fourth leaky cable laid parallel to the first and second leaky cables; the remaining two channels of the first radio frequency remote unit are coupled to one end of the third and fourth leaky cables respectively, and the remaining two channels of the second radio frequency remote unit are coupled to the other end of the third and fourth leaky cables respectively; so that the terminal device located in the overlapping area can receive 8 independent signals at the same time, forming an equivalent 8T8R multiple input multiple output channel.

5. A leaky cable MIMO coverage system based on cross-RRU collaboration according to claim 1, characterized in that, The first and second leaky cables are arranged alternately or vertically along both sides of the tunnel wall to reduce the spatial correlation of the signals fed into the same radio frequency remote unit.

6. A leaky cable MIMO coverage system based on cross-RRU collaboration according to claim 1, characterized in that, The first and second coverage segments are arranged sequentially and periodically along the longitudinal extension direction to form a continuous equivalent high-order multiple-input multiple-output coverage band.

7. A coverage method for a leaky MIMO coverage system based on cross-RRU cooperation as described in any one of claims 1-6, applied to tunnels or narrow spaces, characterized in that, Includes the following steps: At least a first leaky cable and a second leaky cable shall be laid along the longitudinal extension direction of the space; At least two radio frequency channels of the first radio frequency remote unit are respectively coupled to the first ends of the first leaky cable and the second leaky cable to form a first coverage segment; At least two radio frequency channels of the second radio frequency remote unit are coupled to the second ends of the first leaky cable and the second leaky cable, respectively, to form a second coverage segment; Adjust the signal coverage range to create a partially overlapping area between the first and second coverage segments; The first radio remote unit and the second radio remote unit are combined and configured into the same logical cell; When the terminal device is located in the overlapping area, it simultaneously receives and aggregates independent signals from the first radio remote unit and the second radio remote unit to form an equivalent multiple input multiple output channel. The number of layers of the equivalent multiple input multiple output channel is greater than the number of channel layers provided by any radio remote unit on the first or second leaky cable alone, and no cell handover occurs when the terminal moves between the first coverage segment, the overlapping area and the second coverage segment.

8. The coverage method for a leaky MIMO coverage system based on cross-RRU collaboration according to claim 7, characterized in that, Both the first and second leaky cables are spread spectrum leaky cables adapted to the 4.9 GHz band; both the first and second radio frequency remote units are configured in 8-channel 4T4R mode; the two channels of each radio frequency remote unit are fed into the first and second leaky cables respectively; so that in the overlapping area, the terminal device can achieve equivalent 4T4R multiple input multiple output transmission using two physical leaky cables.

9. A coverage method for a leaky MIMO coverage system based on cross-RRU collaboration according to claim 8, characterized in that, It also includes the following steps: Lay the third and fourth leaky cables parallel to the first and second leaky cables; The remaining two channels of the first radio frequency remote unit are coupled to one end of the third and fourth leaky cables, respectively; The remaining two channels of the second radio frequency remote unit are coupled to the other ends of the third and fourth leaky cables, respectively; This allows the terminal device to achieve an equivalent 8T8R multiple-input multiple-output transmission using four physical leaky cables within the overlapping area.

10. A coverage method for a leaky MIMO coverage system based on cross-RRU collaboration according to any one of claims 7-9, characterized in that, When receiving and aggregating signals, the terminal device treats signals from different radio frequency remote units as multi-stream signals from the same cell and performs joint demodulation.

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