CN1559153A - Method and apparatus for sharing infrastructure among wireless network operators - Google Patents

Abstract

An apparatus and methods for sharing communications infrastructure between multiple network operators. In one example, a shared network includes a first infrastructure of a first operator, a second infrastructure of a second operator, and a first remote antenna of the first operator disposed on the second infrastructure and coupled to the first infrastructure by a communication link. The communication link may be a wireless optical link between the first remote antenna and the first infrastructure.

Description

Method and apparatus for sharing infrastructure among wireless network operators

Technical Field of the Invention

The present invention relates to wireless communication networks and, in particular, to sharing network infrastructure among network operators.

Prior Art of the Invention

In densely populated areas, such as large cities, real estate is a scarce commodity, and obtaining timely permits for the deployment of cellular base stations and towers for cellular and other wireless communication networks is becoming increasingly difficult. In rural, or other sparsely populated areas, real estate may be readily available, but installing base stations, towers, and other network infrastructure is expensive, and unlikely to be cheap in areas with few subscribers. Therefore, it is difficult and/or expensive for network operators to increase coverage and/or capacity (eg, by adding additional cellular sites).

Summary of the invention

According to one embodiment, a method of adding capacity to a first network includes the acts of: operating a first remote antenna of a first operator on an infrastructure of a second operator; transmitting and receiving wireless signals with the first remote antenna; The first signal is transmitted from the first infrastructure of the first operator to the first remote antenna and the first signal from the first remote antenna is provided to the first infrastructure.

According to another embodiment, a shared network includes a first infrastructure of a first operator, a second infrastructure of a second operator, and a first infrastructure operating on the second infrastructure and coupled to the first infrastructure by a communication link. Operator's first remote antenna.

Brief description of the drawings

The above and other features and advantages of the present invention will become apparent from the following non-limiting discussion of various embodiments and aspects thereof with respect to the drawings with like reference numerals denoting like elements in different drawings obvious. These drawings are provided for illustration and explanation, and are not intended as a limiting definition of the invention. In these drawings:

Figure 1 is a schematic block diagram of a portion of one embodiment of a shared network in accordance with aspects of the present invention;

2a and 2b are schematic block diagrams of one embodiment of link termination circuitry in accordance with aspects of the present invention;

Figure 3 is a schematic block diagram of a portion of another embodiment of a shared network in accordance with aspects of the present invention.

Detailed description of the invention

The present invention relates to methods and apparatus for mutually sharing communication infrastructure among network operators enabling network operators to enhance their networks by increasing capacity and coverage while minimizing the costs associated therewith. It will be understood that the invention is not limited in its application to the details of construction and arrangement of components set forth in the following description or illustrated in the drawings. Other embodiments and ways of implementing the invention are possible. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of "comprising", "consisting of" or "having" and variations thereof is meant to encompass the items listed thereafter and their equivalents as well as additional items. In addition, one will appreciate that the term "network" refers to an interconnected collection of two or more network elements (which may be, for example, one or more user terminals, base stations, antennas, etc.). It will be understood that any network element may be a distributed network element and be shared by one or more operators. Interconnections between network elements may be using any type of link known in the art (e.g., wireless links, coaxial cables, optical fibers, twisted pair cables, wireless optical links, etc.) or links of these types any combination of .

Referring to Figure 1, there is illustrated a portion of a shared network 10 in accordance with one embodiment of the present invention. A shared network may include network elements forming portions of a network operated by at least two network operators. The shared network may include a first network 12 possibly operated by a first network operator (referred to herein as Operator A) and a second network 12 possibly operated by a second network operator (referred to herein as Operator B). Two networks14. It will be appreciated that although the following embodiments of the invention will be discussed in terms of two network operators, the invention is not so limited and that shared network 10 may include any number of cooperating network operators.

According to one embodiment, the first network 12 may include a first base station (BTS-A) 16 coupled to the first network 12 by a link 18 (which may be any type of link as previously discussed). The first network 12 and the BTS-A 16 may be referred to as a first backhaul structure 17 belonging to operator A. The BTS-A 16 may be coupled to an antenna 20 which may be deployed on a tower 22 belonging to operator A, for example. Antenna 20 may broadcast radio frequency (RF) signals to and receive RF signals from one or more user terminals (not shown), which may be, for example, mobile transceivers, modems, wireless local area network (LAN), etc. . Likewise, the second network 14 may include a second base station (BTS-B) 24 coupled to the second network 14 by a link 26 (which may be any type of link in accordance with the preceding discussion), the second network 14 and the BTS-B - B24 forms a second backhaul structure 27 belonging to operator B. BTS-B 24 may be coupled to an antenna 28 which may be arranged, for example, on a tower 30 belonging to operator B. The operation of and communications between these network elements may be substantially similar to network elements belonging to the first network 12, and will be discussed in more detail below. It will also be appreciated that first network 12 and second network 14 may each include any number of Additional base station terminals and antennas, and such additional structures are intended to be within the scope of this disclosure.

In one example, antennas 20 and 28 may be coupled via link 32 to BTS-A16 and BTS-B24, respectively. Link 32 may be any type of link including, for example, microwave links, radio frequency (RF) cable links, communication over power lines, fiber optics, wireless optical links, coaxial cables, twisted pair cables, and the like.

In some embodiments where link 32 may be an optical link (wireless or fiber optic), each antenna 20, 28 may include an antenna termination that may function to couple antenna 20 to the optical link, as described in more detail below. discussion. Also, in these embodiments, BTS-A16 and BTS-B24 may include base station terminals coupling BTS-A16 and BTS-B24 to optical link 32 . Links 32 may be considered as full-duplex couplings between the end network elements of the respective links.

Referring to Figures 2a and 2b, there is illustrated a schematic block diagram of one example of antenna terminal and base station terminal circuitry in accordance with aspects of the present invention. As previously discussed, when link 32 is an optical link, antenna 20 (see FIG. 1 ) may include an antenna terminal, referred to herein as microwave remote unit (MRU) 100 (illustrated in FIG. 2a ). , while the BTS-A16 may include a base station terminal, referred to herein as a Microwave Donor Unit (MDU) 200 (illustrated in FIG. 2b). MRU 100 and MDU 200 may each include electro-optical circuitry that converts back and forth between RF signals generated or received by the associated network element and optical signals transmitted over link 32 . It will be appreciated that although the following discussion regarding MRU 100 and MDU 200 may be presented in terms of antenna 20 and BTS-A 16, such discussion applies equally and interchangeably to antenna 28 and BTS-B 24.

Referring to FIG. 2a, the MRU 100 can be used as a converter between RF signals and optical signals, and the optical signal link 32 transmits signals between the user terminal 102 and the BTS-A16 (see FIG. 1). MRU 100 may include a central processing unit (CPU) 106 that may provide overall control of operating parameters of components (eg, supply voltage or gain settings of components) within MRU 100 . MRU 100 may also include duplexer 108 that may enable RF antenna element 104 to receive RF signals from and transmit RF signals to user terminal 102 . RF antenna element 104 may receive uplink signals transmitted by user terminal 102 and divert the uplink signals to duplexer 108 . Uplink signals may be passed from duplexer 108 to bandpass filter (BPF) 110 at a bandwidth defined in accordance with the operating protocol of shared network 10 (e.g., 824-849 MHz) for carrying uplink signals. operates in accordance with certain embodiments and rejects signals at other frequencies. The filtered uplink signal from BPF 110 is amplified by means of a low noise amplifier (LNA) 112 and a second amplifier 114 which provide an overall gain (eg, approximately 70 dB) to the system.

According to the illustrated example, the second amplifier 114 may transfer the uplink signal to the optical transmitter 116 as a modulated signal. According to some embodiments, optical transmitter 116 may include a solid state laser diode. Alternatively, optical transmitter 116 may be any other suitable electromagnetic wave transmitter known in the art that emits waves that can be modulated and detected. Modulation may be implemented as any type of analog or digital modulation known in the art or a combination thereof. In some embodiments, modulation may be applied using one or more subcarriers as is known in the art. Optical transmitter 116 may be powered by power supply (PS) 118 such that the average power output from the transmitter is substantially constant. In another example, an attenuator 120 may be included to further control the power supplied to the optical transmitter 116 and thus the output of the optical transmitter 116 .

In one example, the optical transmitter 116 can generate coherent radiation having a wavelength in the range of approximately 850-1550 nanometers (nm) at a power range of approximately 1-500 milliwatts (mW), or alternatively at any other convenient power level and wavelength. The radiation is collimated into substantially parallel beams by means of transmission collimating optics 122 . For example, if optical emitter 116 comprises a laser diode, optics 122 may comprise one or more lenses and/or other optical components implemented by means known in the art for collimating the generally diverging light beam radiating from the laser diode. Combination of components such as optical fibers. According to one example, the collimated beam may have a divergence in the range of about 0.5-2.5 mrad. The parallel beam is transmitted over link 32 as free space uplink optical signal 123 to MDU 200 at BTS-A16. In this example, the power emitted by the optical transmitter 116 is preferably less than a level of power that would cause harmful effects when irradiated on a person. According to other embodiments or aspects, link 32 may include an optical fiber and optics 122 include optics coupled to the optical fiber. In this example, higher transmit powers are possible.

Referring to FIG. 2b, uplink optical signal 123 transmitted on link 32 may be received by MDU 200 at BTS-A16. The BTS-A16 is coupled to the MDU 200 which also acts as a converter between RF radiation and optical radiation. MDU 200 may include CPU 202 that may provide overall control over operating parameters of components within MDU 200 . According to some embodiments, CPU 106 and/or CPU 202 may also generate management signals, as is known in the art, in order to monitor and/or control components of link 32 .

Uplink optical signals are received by receive collimation optics 204 in MDU 200 . Optics 204 focus the received radiation onto an optoelectronic converter 206 that converts the radiation into an (RF) electrical signal in MDU 200 . Converter 206 may also provide an initial preamplification stage for the RF signal. In the illustrated example, the preamplified RF signal is first filtered by isolation BPF 208 and then amplified by main amplifier 210 . Amplifier 210 provides an output signal on line 212 to BTS-A16. The output signal may be transmitted to the first network 12 via the BTS-A 16 .

Referring again to FIG. 2 b , the BTS-A 16 also supplies downlink signals to the user terminal 102 via the link 32 . According to some embodiments, the downlink signals may be in the 869-894 MHz frequency band, although any other suitable frequency band available in the communication protocol implemented in the shared network 10 may be used. The downlink RF signal may be diverted on line 214 to a variable attenuator 216 that adjusts the RF signal level to provide the proper modulation depth to the optical transmitter 218 . Optical transmitter 218 may be substantially similar in operation and implementation to optical transmitter 116 in MRU 100 , providing an electromagnetic wave output modulated in one of the ways previously described with respect to optical transmitter 116 . Thus, in some embodiments, the optical transmitter 218 is powered by a power supply 220 such that the power output from the transmitter is substantially constant, while in alternative embodiments an attenuator 222 may be used to further control the power output from the optical transmitter. The power output 218 of the device is provided.

Radiation from optical emitter 218 is collimated by transmission collimation optics 224, generally similar to optics 122 in an MRU. In one example, optics 224 may be implemented against optical emitter 218 as previously discussed in order to generate a light beam with a divergence in the range of approximately 0.5-2.5 mrad.

Radiation from optical transmitter 218 is transmitted as downlink optical signal 226 via link 32, which may be a wireless optical link and/or fiber optic, as previously discussed. The downlink optical signal 226 is received by the receive collimation optics 124 in the MRU 100 (see Figure 2a). Optics 124 focus the received radiation onto photoelectric converter 126 in MRU 100, which converts the radiation into an electrical signal, thereby recovering the electrical signal provided by BTS-A16. According to some embodiments, the optical-to-electrical converter 126 may be substantially similar in operation and implementation to the optical-to-electrical converter 206, and may also provide a preamplification stage for the received electrical signal.

In the illustrated example, the recovered preamplified electrical signal is filtered by filter 128 and transferred to power amplifier (PA) 130 . In other examples, filter 128 may not be present and the recovered pre-amplified signal may be transferred directly to PA 130 . PA 130 is adapted to increase the power level to a final output level suitable for transmission to user terminal 102 . The amplified signal from PA 130 is diverted to duplexer 108 and then transmitted from RF antenna element 104 to user terminal 102 .

Thus, using MRU 100 and MDU 200, BTS-A 16 can communicate RF signals to and from user terminals over a wireless optical link (eg, link 32).

Referring again to FIG. 1 , according to one embodiment of the shared network 10, an operator (e.g., Operator A) can communicate with another operator (e.g., Operator B) by placing one or more additional remote antennas on top of another operator (e.g., Operator B) infrastructure and connect these antennas to the first network 12 to increase the capacity and/or coverage of the first network 12. For example, operator A may place remote antenna 34 on tower 30 belonging to operator B. In one example, remote antenna 34 may include MRU 100 and may be coupled to BTS-A 16 via wireless optical link 37 . Remote antenna 34 may receive RF signals from any number of subscriber terminals located within the coverage area of remote antenna 34 and may convert these RF signals into one or more RF signals that may be transmitted to BTS-A 16 via wireless optical link 37. optical signal.

According to another embodiment, antennas 20 and 34 may each include a combined MRU 100 and MDU 200 referred to as a Symmetrical Donor Remote Unit (SDRU). Remote antenna 34 may convert RF signals received from one or more user terminals into one or more optical signals that may be transmitted via wireless optical link 36 to antenna 20 located on tower 22 . In one example, antenna 20 may use an SDRU to convert the received optical signal to an RF electrical signal and route the electrical signal via link 32 (which in this example may be a non-optical link such as a microwave link, coaxial cable, twisted pair cable, etc.) to the BTS-A16. Alternatively, antenna 20 may include optical pass through circuitry and may transmit optical signals received from remote antenna 34 via link 32 (which in this example may be the previously discussed optical link) to BTS-A16.

It will be appreciated that an optical transceiver (eg, SDRU or MRU) may be provided, eg, packaged or co-located with the antenna on tower 22, as illustrated. However, any component of antenna 20 may be separated from antenna package 20 and provided as a separate unit that is not part of antenna 20 . For example, referring to FIG. 2a, RF antenna element 104 may be separate from MRU 100 (or an SDRU which may include MRU 100 and MDU 200), and may use coaxial cables, radio frequency (RF) links, fiber optics, or any other type of antenna known in the art. The connection mode is connected to the MRU (or SDRU). In another example, the optical antenna element 122 may be separated and located remotely from the rest of the circuitry. Optics 122 may also be connected to the remainder of the MRU or SDRU using any suitable connection. The same is true for any remote antennas 34 and 38 and antenna 28 belonging to operator B.

Similarly, operator B may place remote antenna 38 on tower 22 belonging to operator A, and may couple remote antenna 38 to second network 14 in any manner previously described with respect to remote antenna 34 . Thus, as previously discussed with respect to remote antenna 34, remote antenna 38 and/or antenna 28 may each include an MRU or SDRU, remote antenna 38 may include an MRU, and antenna 28 may include an optical transfer port to which optical link 32 is connected. , or the antenna 38 may comprise an MRU, and the BTS-B may comprise an MDU forming an optical link 39 between the antenna 38 and the BTS-B 24. Furthermore, it will be appreciated that the system may also operate to provide signals from the network to user terminals, i.e., in a similar manner, the remote antennas 34, 38 may receive optical signals, for example, via link 36, and the optical The signal is converted to an RF signal that is broadcast to user terminals.

It will also be appreciated that while Figure 1 illustrates two operators whose infrastructure is shared between operators, that any number of operators can join the shared network and that infrastructure can be used in any and all possible combinations. shared. It will further be appreciated that operators A and B may be related in some way (eg, subsidiaries of a common parent company). Alternatively, operators A and B may be competitors and may offer each other relative benefits in exchange for sharing each other's infrastructure, or may have any other relationship known to those in the industry.

According to another embodiment, antenna 28 (or antenna 20) may be a multi-band or sectored antenna, and operator B may allow operator A (or operator A may allow operator B) to use one or more A spare sector or frequency band covered by antenna 28 (or antenna 20). Therefore, operator A (or operator B) does not need to place his additional antenna 34 (or antenna 38) on tower 30 (or tower 22) for this embodiment, but can place antenna 28 (or Antenna 20) is coupled via optical link 36 to a sector or frequency band of BTS-A 16 (or BS-B 24), as previously described.

One advantage of the above-described method and apparatus for sharing infrastructure is that Operators A and B may each already have operating permits, licenses, etc. for their respective sites, and may already have complete of buildings, including towers 22 and 30. Therefore, each operator can increase capacity by simply adding remote antennas or by using an unused sector of another operator (e.g., forming that remote antenna or sector and coupling it to the operator's existing network) to their respective networks, as described above. This can be much more economical than building additional towers and building additional infrastructure. Furthermore, the systems and methods described above allow each operator to reuse their existing backhaul equipment 17, 27 to communicate with additional remote antennas or sectors.

Referring to Figure 3, there is illustrated a schematic block diagram of a portion of another embodiment of a sharing network 10 in accordance with aspects of the present invention. It will be appreciated that in FIG. 3 structures similar to those of FIG. 1 have been illustrated with like reference numerals and that, for the sake of brevity, the function of each device has not been explicitly repeated. In this embodiment, an operator (e.g., operator C) may allow another operator (e.g., operator B) to use its backhaul infrastructure 40, which includes a base station terminal (BTS-C) 42 and a third network 44, in Signals are communicated between the second network 14 and the remote antenna 38 . Additionally or alternatively, Operator B may allow Operator C to place the remote antenna 46 on the tower 30 that belongs to Operator B, or may allow Operator C to use the location of the multi-sector antenna 28 that belongs to Operator B One or more spare sectors, eg, as previously described. It will be appreciated that according to any of the above-described embodiments and possible combinations thereof, each operator can benefit from the mutual sharing of equipment and infrastructure among the operators.

According to one embodiment, remote antenna 38 (belonging to operator B) may be located on tower 22 belonging to operator A. As previously discussed, remote antenna 38 may include an MRU or SDRU (not shown) to convert RF signals to and from optical signals or to convert RF signals to different RF frequencies. Remote antenna 38 may communicate with BTS-C 42 via link 48 (which may be a wireless optical link, for example). The operation of wireless optical link 48 may be substantially the same as wireless optical link 32 or 36 previously described. BTS-C 42 may transfer the signal received from the remote antenna 38 to Operator C's third network 44 . The third network 44 may be linked to the second network 14 via a network link 50, which may allow signals to be passed to and processed by the second network 14 as if the remote antenna 38 were directly coupled to the second network 14 same as above.

It will be appreciated that each link described herein and any embodiment or possible combination described herein can be used to provide a corresponding backhaul fabric and/or wireless optical link from the respective network through another operator The signal is transmitted to a remote antenna (not illustrated) on the infrastructure used by some other operator to broadcast to any number of user terminals. Therefore, each of the links described in this paper can be used by operators without additional infrastructure to increase capacity.

For example, in a similar manner, the first network 12 may be linked to the third network 44 via network link 50, allowing operators A and C to share infrastructure in a similar manner as previously described with respect to operator B. Network link 50 may be any type of link including, but not limited to, wireless links, microwave links, coaxial cables, twisted pair cables, communicating over power lines, communicating over cable television links, fiber optics, and the like.

The advantage of the shared network described above is that each operator can add capacity to its network, thereby improving service to its user terminals, while sharing the installation and operation of backhaul structures and other network infrastructure (e.g., towers) cost of. It will be appreciated that the shared network described herein can accommodate any number of operators, and that each operator can deploy remote antennas on any one or more of the other operator's infrastructure (or utilize another operator's the spare sector of the multi-band sectorized antenna of the member). Thus, for example, operator C may remotely deploy and couple to one or both of operator A's backhaul formation 17 and operator B's backhaul formation 27 . The same is true for each appended operator.

Thus, it will be appreciated that in accordance with one aspect of the present invention, any operator A, B or C infrastructure can be either directly on a communication link (e.g., the wireless optical link previously discussed) or via another The operator's backhaul structure receives the signal from the remote antenna. It will also be appreciated that a combination of communication links may be used, for example, a signal from a remote antenna belonging to operator A (e.g., located on a tower belonging to operator C) may be via a wireless optical link (e.g., link 36, See Figure 1) is transmitted to Operator B's backhaul structure, then the signal can be transmitted from Operator B's network to Operator A's network via a network link.

It will be appreciated that shared network 10 and each of networks 12 and 14 may be in accordance with one or more industry standard multiplexing systems [e.g., time division multiple access (TDMA), frequency division multiple access (FDMA) and/or code division multiple access Multiple Access (CDMA)] or any other standard or expected standard to be used in the technology, and in some embodiments the remote antennas (e.g., 20, 34) may be in the radio frequency (RF) bands allocated for cellular communications operate.

Additionally, spare RF backup links may be provided for each of the links 36, 37, 39 and 48 previously described. Thus, if the optical link fails, for example due to bad weather conditions, communication can still be established between the remote antenna and the respective base station using the backup RF link. In one example, these spare RF links may operate at approximately 5.8 GHz, but any frequency may be used if desired by the operator.

Having thus described various illustrative embodiments and aspects thereof, modifications and alternatives may be apparent to those skilled in the art. For example, the towers belonging to operators A and B need not be conventional towers, but could be, for example, the roof of a building, a pointed building, an outdoor billboard, or other suitable location for mounting an antenna. In addition, user terminals and base stations can generate many different types of signals to be transmitted by antennas, such as cellular signals, LAN signals, bluetooth, 802.11b signals, etc., and different types of signals can be transmitted in different directions on the link. upload. For example, a base station could send a cellular signal to a remote antenna located on a building, and that remote antenna could "backhaul" LAN, Bluetooth, 802.11b, data, etc. In a network such as the net. In addition, an operator (eg, operator A) may allow another operator to share its BTS-A in a manner similar to that described above for sharing antenna sectors. Additionally, in some embodiments, one or more base stations may be replaced by a server or hub of a wireless local area network. Such modifications and alternatives are intended to be included in this disclosure which is for purposes of illustration only and not intended to be limiting. The scope of the present invention should be determined by proper interpretation of the claims and their equivalents.

Claims (21)

1. one kind adds to the method for first network to capacity, and this method comprises following behavior:

Operation first operator's first remote antenna on second operator's infrastructure;

With transmission of first remote antenna and reception wireless signal;

First infrastructure of first signal from first operator is sent to first remote antenna and first signal from first remote antenna is offered first infrastructure.

According to the process of claim 1 wherein the transmission and provide the behavior of first signal to comprise via the wireless optical link transmission optical signalling between first infrastructure and first remote antenna.

3. according to emission and provide the behavior of first signal to be included in first signal is provided on the coaxial cable is provided.

4. according to transmission and provide the behavior of first signal to be included in first signal is provided on the optical fiber is provided.

5. according to transmission and provide the behavior of first signal that first signal that provides on the radio frequency link is provided is provided.

6. according to the method for claim 1, further be included in the behavior that first remote antenna converts wireless signal to first signal.

7. according to the process of claim 1 wherein that the behavior of operating first remote antenna comprises a sector of the branch fan antenna that uses second operator.

8. according to the process of claim 1 wherein that the behavior of operating first remote antenna comprises a frequency band of the multiband antenna that uses second operator.

9. provide behavior to comprise following behavior according to the process of claim 1 wherein from first signal of first remote antenna:

First signal from first remote antenna via second return structures of second communication link transmission to second operator;

Secondary signal is transferred to first operator's first network via network link from second return structures; And

First network with first operator receives secondary signal.

10. according to the process of claim 1 wherein that the behavior that first signal not is transferred to first remote antenna comprises following behavior:

First signal is transferred to the 3rd operator's network via network link;

From first signal of this network via the 3rd operator's network and the wireless optical link transmission between first remote antenna to first remote antenna.

11. a shared network, comprising:

First operator's first infrastructure;

Second operator's second infrastructure;

The operation and first operator's that is coupled by communication link and first infrastructure first remote antenna on second infrastructure.

12. according to the shared network of claim 11, wherein communication link comprises the wireless optical link between first remote antenna and first infrastructure.

13. according to the shared network of claim 11, wherein second infrastructure comprises the honeycomb tower.

14., further be included on first infrastructure operation and second operator's that is coupled by the communication link and second infrastructure second remote antenna according to the shared network of claim 11.

15. according to the shared network of claim 11, wherein first infrastructure comprises first return structures, the latter comprises first base station terminal and first network.

16. according to the shared network of claim 15, wherein communication link comprises:

Network link between second return structures of first network and second infrastructure; And

Wireless optical link between second return structures and first remote antenna.

17. according to the shared network of claim 11, wherein network link comprises radio frequency link.

18. according to the shared network of claim 11, wherein network link comprises optical fiber.

19. shared network according to claim 11, the 3rd infrastructure that further comprises the 3rd operator, and wherein communication link comprises wireless optical link between first remote antenna and the 3rd infrastructure and the network link between the 3rd infrastructure and first infrastructure.

20. according to the shared network of claim 11, wherein first remote antenna comprises a sector of second operator's branch fan antenna.

21. according to the shared network of claim 11, wherein first remote antenna comprises a frequency band of second operator's multiband antenna.

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