CN107635294B - Base station subsystem, signal transmission method, base station device, and storage medium - Google Patents
Base station subsystem, signal transmission method, base station device, and storage medium Download PDFInfo
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- CN107635294B CN107635294B CN201710865857.3A CN201710865857A CN107635294B CN 107635294 B CN107635294 B CN 107635294B CN 201710865857 A CN201710865857 A CN 201710865857A CN 107635294 B CN107635294 B CN 107635294B
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Abstract
The invention discloses a base station subsystem, a signal transmission method, base station equipment and a storage medium, wherein the base station subsystem comprises a BBU and more than three chain-covered dual-channel RRUs (radio remote units) connected with the BBU, two channels of one RRU are respectively connected with two ports of one dual-polarized antenna, polarization receiving ends in one polarization direction of all dual-polarized antennas except the dual-polarized antennas corresponding to the RRUs at two ends of a chain are configured into a first cell, the polarization receiving end in the other polarization direction is configured into a second cell, and the first cell and the second cell provide services for user terminals in two opposite moving directions; the BBU receives a baseband signal of a user terminal uploaded by the RRU at one chain end, determines the moving direction of the user terminal according to the position of the RRU at one chain end, and allocates corresponding cell resources to the user terminal according to the determined moving direction. The base station subsystem of the embodiment of the invention can effectively improve the service bearing capacity of the system network and improve the perception of users.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a base station subsystem, a signal transmission method, a base station device, and a storage medium.
Background
At present, the construction planning of a high-speed rail private network adopts a mode of a private cell and a private frequency point, and the problems of congestion, untimely switching and the like caused by public network coverage can be solved. The coverage mode is realized through a Base Band Unit (BBU), a dual-channel Radio Remote Unit (RRU) and a high-gain antenna, so that the bottleneck that the eight-channel RRU does not have the cascade capacity is solved, the switching times among cells of high-speed users are reduced, and the service stability is improved.
In order to greatly reduce the switching and reselection times of a high-speed railway under high-speed motion and maintain the stability and the smoothness of service connection, a network mode in which a plurality of RRUs share a cell is adopted in a Long Term Evolution (LTE) high-speed rail private network at present, as shown in fig. 1, when a train drives in, all the RRUs in the cell provide service for train users together. When two or more trains are entering the cell, the cell serves several users of the trains simultaneously, as shown in fig. 2. However, when the cell provides services for multiple trains at the same time, resource bottlenecks are likely to occur, and service perception is affected. In addition, because LTE spectrum resources are in shortage, in order to guarantee the network quality of a large network, it is difficult to allocate more frequency points to a private network, and therefore, the problems of limited bearing capacity and insufficient resources of a high-speed rail cannot be solved through carrier expansion.
Disclosure of Invention
The embodiment of the invention provides a base station subsystem, a signal transmission method, base station equipment and a storage medium, and improves the network service bearing capacity.
According to an aspect of the present invention, an embodiment of the present invention provides a base station subsystem, where the base station subsystem includes a baseband processing unit BBU, and more than three chain-covered dual-channel radio remote units RRUs connected to the BBU, where two channels of one RRU are connected to two ports of one dual-polarized antenna respectively, a polarization receiving end in one polarization direction of all dual-polarized antennas except dual-polarized antennas corresponding to RRUs at two ends of a chain is configured as a first cell, and a polarization receiving end in another polarization direction is configured as a second cell, where the first cell provides service for a user terminal in a first moving direction, the second cell provides service for a user terminal in a second moving direction, and the first moving direction is opposite to the second moving direction;
the BBU is used for receiving a baseband signal of the user terminal uploaded by the RRU at the chain end, determining the moving direction of the user terminal according to the position of the RRU at the chain end, and allocating corresponding first cell resources or second cell resources to the user terminal according to the determined moving direction.
Further, as for the base station subsystem described above, all polarization receiving ends of the first cell resource are cascaded, and all polarization receiving ends of the second cell resource are cascaded.
Further, as for the base station subsystem, the RRUs are linearly distributed along the high-speed railway in a chain shape, and the user terminal is a high-speed railway user terminal.
Further, as for the base station subsystem described above, the handover manner between two adjacent first cells and the handover manner between two adjacent second cells are both configured as unidirectional handover, the handover direction between two adjacent first cells is the first moving direction, and the handover direction between two adjacent second cells is the second moving direction.
Further, as for the base station subsystem described above, the dual-polarized antenna is a plus-minus 45-degree dual-polarized antenna or a vertical-horizontal dual-polarized antenna.
According to another aspect of the present invention, an embodiment of the present invention provides a signal transmission method based on the foregoing base station subsystem, where the method includes:
the RRU at one chain end receives a radio frequency signal of a user terminal, converts the radio frequency signal into a baseband signal and uploads the baseband signal to the BBU;
the BBU determines the moving direction of the user terminal according to the position of the RRU at the chain end for uploading the baseband signal, and allocates corresponding cell resources for the user terminal according to the determined moving direction;
and the user terminal and the BBU carry out signal transmission based on the polarization receiving end of the cell resource distributed by the BBU and the RRU channel.
Further, in the signal transmission method described above, the determining, by the BBU, the moving direction of the user terminal according to the position of the RRU at the chain end that uploads the baseband signal includes:
if the BBU only receives the baseband signals uploaded by the RRUs at one end of the chain and does not receive the baseband signals uploaded by other RRUs except the two ends of the chain, the moving direction of the user terminal is determined to be the direction from one end of the chain to the other end of the chain.
Further, in the signal transmission method described above, the transmitting of the signal between the user terminal and the BBU based on the RRU channel and the polarization receiving end of the cell resource allocated by the BBU includes:
in the uplink direction, a polarization receiving end of the allocated cell resource receives a radio frequency signal of a user terminal, the received radio frequency signal is sent to a corresponding RRU channel, and the RRU channel converts the radio frequency signal into a baseband signal and sends the baseband signal to a BBU;
and/or the presence of a gas in the gas,
in the downlink direction, the BBU sends the baseband signals to the RRU, the RRU converts the baseband signals into radio frequency signals through RRU channels of corresponding cell resources according to a cell where a user terminal corresponding to the baseband signals is located, and then outputs the radio frequency signals to corresponding polarization receiving terminals, and the corresponding polarization receiving terminals send the radio frequency signals to the corresponding user terminals.
According to yet another aspect of the present invention, an embodiment of the present invention provides a base station apparatus, including a memory and a processor;
a memory for storing executable program code;
and a processor for reading the executable program code stored in the memory to perform the signal transmission method of the embodiment of the present invention.
According to still another aspect of the present invention, an embodiment of the present invention provides a computer-readable storage medium having stored therein computer instructions, which, when run on a computer, cause the computer to execute a signal transmission method of an embodiment of the present invention.
The base station subsystem, the signal transmission method, the base station equipment and the storage medium of the embodiment of the invention utilize the cross polarization of the two-channel RRU, and divide the original common cell of one RRU into two cells by separating the cross polarization, so that the two cells respectively bear the services of mobile terminals in different moving directions, the network service bearing capacity is improved, and the perception of users is improved.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.
Fig. 1 is a schematic diagram of a high-speed rail private network with multiple RRUs sharing a cell to provide service for a train in the prior art;
fig. 2 is a schematic diagram of a high-speed rail private network with multiple RRUs sharing a cell to provide service for two trains running in opposite directions in the prior art;
fig. 3 is a schematic diagram of a connection structure of a conventional dual-polarized antenna with multiple RRUs sharing a cell;
fig. 4 is a schematic structural diagram of a base station subsystem according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a cascade structure of a dual-polarized antenna with multiple dual-channel RRUs in the embodiment of the present invention;
fig. 6 is a schematic diagram of a horizontal-vertical dual-polarized antenna in an embodiment of the invention;
fig. 7 is a coverage schematic diagram of cell resources of a base station subsystem in a high-speed rail application scenario according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a signal transmission method according to an embodiment of the invention;
fig. 9 is a schematic diagram of a hardware framework of a computing device capable of implementing the base station subsystem and the signal transmission method according to the embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
The Time Division Multiplexing (TD) base station subsystem comprises a BBU and an RRU, wherein the BBU and the RRU are connected through optical fibers, and the RRU is divided into a multi-channel RRU and a single-channel RRU. The multi-channel RRU provides multi-channel (port) radio frequency output on one radio remote unit. In some special application scenarios, such as high-speed scenarios like high-speed trains, subways, tunnels, magnetic levitation, etc., in order to reduce the times of cell switching and cell reselection of users under high-speed motion, in a coverage scheme of a mobile network, a BBU + multiple RRUs networking mode is adopted, multiple RRUs cover the same logical cell, and one BBU corresponds to one logical cell.
Fig. 3 shows a schematic diagram of a cell a formed by cascading dual-polarized antennas of 6 dual-channel RRUs in an existing network (if the dual-polarized antennas are cascaded, corresponding RRUs are also cascaded), as can be seen from the diagram, two radio frequency ports of the dual-polarized antennas of all the RRUs are all cascaded, a polarization receiving end of the dual-polarized antennas receives radio frequency signals of a user terminal, and the two radio frequency signals are converted into two baseband signals by the RRUs and then sent to the BBU, so that uplink polarization diversity reception is realized. With the cascade architecture shown in fig. 3, when a train enters and a user terminal accesses to the cell a, the 6 RRUs in the cell a provide services to train users together, so as to maintain the connection stability and smoothness of services. However, when two or more trains simultaneously enter the cell a, the cell a is likely to have resource bottlenecks, which affects service perception.
In order to improve service carrying capacity of a network and improve service perception of a user, embodiments of the present invention provide a base station subsystem, a signal transmission method, a base station device, and a storage medium.
Fig. 4 shows a schematic structural diagram of a base station subsystem in an embodiment of the present invention. As shown in the figure, the base station subsystem includes a BBU110 and more than three dual-channel RRUs 120 connected to the BBU110 and covered in a chain form, in this embodiment, 5 RRUs are shown, two channels of one RRU120 are respectively connected to two ports of one dual-polarized antenna 130, polarization receiving ends in one polarization direction of all dual-polarized antennas except the dual-polarized antennas corresponding to the RRUs 120 at two ends of the chain form are configured as a first cell, and a polarization receiving end in another polarization direction is configured as a second cell, where the first cell provides service for a user terminal in a first moving direction, the second cell provides service for a user terminal in a second moving direction, and the first moving direction is opposite to the second moving direction.
The BBU110 is configured to receive a baseband signal of a user terminal uploaded by the RRU120 at the chain end, determine a moving direction of the user terminal according to the position of the RRU120 at the chain end, and allocate corresponding first cell resources or second cell resources to the user terminal according to the determined moving direction.
In the embodiment of the present invention, the cell resource includes an RRU channel corresponding to the cell and a polarization receiving end of a polarization antenna connected to the corresponding RRU channel. For example, for a first cell, the resources of the first cell are the polarization receiving end in the above one polarization direction and the RRU channel correspondingly connected to the polarization receiving end. For the second cell, the resources of the second cell are the polarization receiving end in the other polarization direction and the RRU channel correspondingly connected to the polarization receiving end.
In the base station subsystem of the embodiment of the present invention, by separating two channels of the RRU120 and two antennas in two polarization directions of the dual-polarized antenna 130 connected to the RRU120, one logic cell corresponding to a plurality of original RRUs is separated into two logic cells with the same frequency, and the two cells are controlled to provide services to user terminals in different moving directions. When a user terminal with a moving direction enters a network coverage area of a base station subsystem, and a network needs to be accessed, the RRU120 at one chain end first receives a radio frequency signal uploaded by the dual-polarized antenna 130 connected with the RRU120, the RRU120 converts the radio frequency signal into a baseband signal to be uploaded to the BBU110, and at this time, the BBU110 can judge the moving direction of the user terminal according to the position of the RRU120 uploading the baseband signal, so that corresponding cell resources are allocated to the user terminal. For example, when the BBU110 first receives a baseband signal uploaded by the RRU120 at the rightmost end of the chain, it determines that the moving direction of the user terminal is from right to left, and allocates a cell resource configured to provide service to the user terminal moving from right to left to the user terminal. When a bidirectional user terminal needs to access, the BBU110 receives baseband signals uploaded by the RRUs 120 at two ends of the chain, and at this time, the BBU110 allocates cell resources configured to provide service to the user terminal moving from left to right to the user terminal corresponding to the baseband signal uploaded by the RRU120 at the leftmost side of the chain, and allocates cell resources configured to provide service to the user terminal moving from right to left to the user terminal corresponding to the baseband signal uploaded by the RRU120 at the rightmost side of the chain.
By adopting the base station subsystem of the embodiment of the invention, when a large number of user terminals in two opposite moving directions are accessed simultaneously, corresponding cell resources can be allocated to the user terminals according to the moving directions, so that the resource competition of the user terminals to one RRU channel is greatly reduced, the service bearing capacity of the base station subsystem is greatly improved on the basis of no change of the total number of the RRU resources, the service bearing capacity of the system can basically reach twice of that of the existing base station subsystem, and the perception of users is effectively improved.
It should be noted that, in the embodiment of the present invention, two ports of the dual-polarized antenna 130 refer to ports where the antenna is connected to the RRU120, such as a port I and a port J in fig. 4, and a polarized receiving end is an end of the antenna, relative to the user terminal, where the dual-polarized antenna 130 receives a radio frequency signal of the user terminal, such as a receiving end M and a receiving end N shown in fig. 4.
In order to further improve the service carrying capacity of the base station subsystem and improve the perception of users, in an embodiment of the present invention, it is preferable that all the polarized receiving ends of the first cell resource are cascaded, and all the polarized receiving ends of the second cell resource are cascaded.
Fig. 5 shows a schematic connection diagram of a dual-polarized antenna connected to RRUs except two chain ends in a base station subsystem according to a specific embodiment of the present invention. In the figure, a and B are two polarization receiving ports of the antenna, a corresponds to one polarization direction, and B corresponds to the other polarization direction, and it can be seen from the figure that a polarization receiving end cascades of all polarization antennas are configured as a cell a, B polarization receiving end cascades of all dual-polarization antennas are configured as a cell B, and the cell a and the cell B are horizontally covered.
In the embodiment of the present invention, the dual-polarized antenna 130 may adopt a plus-minus 45-degree dual-polarized antenna or a vertical-horizontal dual-polarized antenna. As shown in fig. 6, it is a schematic diagram of a vertically polarized antenna, and the antenna has two polarization directions of vertical polarization and horizontal polarization.
In the embodiment of the invention, all the RRUs 110 of the base station subsystem are distributed in a chain-like straight line along the high-speed railway, and the user terminal is a high-speed railway user terminal.
The base station subsystem of the embodiment of the invention is particularly suitable for high-speed scenes such as high-speed rails, subways, tunnels, magnetic levitation and the like, and preferably adopts a chain linear coverage mode for the mobile communication network along the high-speed line according to the user moving characteristics of the high-speed scenes, and correspondingly, the user terminal in the high-speed scenes is the high-speed railway user terminal.
In the embodiment of the present invention, both the handover manner between two adjacent first cells and the handover manner between two adjacent second cells are configured as unidirectional handover, the handover direction between two adjacent first cells is a first moving direction, and the handover direction between two adjacent second cells is a second moving direction.
In the existing scheme of sharing a cell by multiple RRUs of a base station subsystem, in order to carry terminal users in two different moving directions, all the switching modes between adjacent cells must adopt bidirectional switching, but the bidirectional switching is likely to cause the problem of ping-pong switching. For example, in a practical application scenario, a is adjacent from north to south1、A2The cells are distributed at the railway edge at the interval of 1km (the cell coverage distance is 1km), and the user terminals of the train users running from south will be A1Switch to A2In the north, the user of the train will drive from A2Switch to A1In the above, frequent bidirectional handover may result in ping-pong handover, which affects the service perception of the user.
The base station subsystem of the embodiment of the invention splits the dual channels of the RRU130 and the two polarization receiving ends of the corresponding dual-polarization antennas and configures the two polarization receiving ends into two cells, and each cell only needs to be responsible for a user in one moving direction, so that the switching mode of the adjacent cells is configured into unidirectional switching, and the switching direction corresponds to the moving direction of a user terminal providing service for the cell, thereby preventing the occurrence of frequent switching of the user, and timely reselecting the cell A when the user which should be borne by the cell A falls into the cell B.
Fig. 7 is a schematic structural diagram illustrating a practical application scenario of a base station subsystem according to an embodiment of the present invention. The upper dotted oval in the figure represents the network service range of cell a, the lower dotted oval represents the network service range of cell B, cell a serves trains traveling from right to left, and cell B serves trains traveling from left to right. When a train enters a cell A or a cell B and a user terminal of a train user needs to access, the BBU judges the running direction of the train, namely the moving direction, according to the number of users and the increase of service volume accessed by RRUs at two ends of a chain, and allocates corresponding cell resources according to the running direction.
In this application scenario, the network load-bearing process when the train enters is as follows: if the BBU only receives the baseband signals uploaded by the RRUs at one end of the chain and does not receive the baseband signals uploaded by other RRUs except the two ends of the chain, the moving direction of the user terminal is determined to be the direction from one end of the chain to the other end of the chain. For example, when the rightmost RRU recognizes that a large number of users are accessed and reside, that is, the RRU on the rightmost end of the chain receives a radio frequency signal uploaded by a dual-polarized antenna connected to the RRU, and the resources of the other RRUs are idle, the RUU on the rightmost end converts the received radio frequency signal into a baseband signal and uploads the baseband signal to the BBU, the BBU determines that a train enters from the right side according to the position of the RRU uploading the baseband signal, and allocates the resources of the cell a to the user terminal of the train, and the cell B does not carry services. When the leftmost RRU receives a large number of user accesses and resides and the resources of the rest RRUs are idle, the fact that the train enters from the left direction can be judged, and the resources of the cell B are allocated to the users of the train.
The base station subsystem of the embodiment of the invention can reduce the competition of the user terminal to the RRU channel and improve the service bearing capacity of the system under the condition that the total RRU resource number is not changed, and the system is especially suitable for application scenes such as a high-speed railway and the like, and can greatly improve the perception of users when a large number of user terminals moving oppositely access a network.
Based on the base station subsystem of the embodiment of the present invention, an embodiment of the present invention further provides a signal transmission method, as shown in fig. 8, the signal transmission method may include the following steps:
step S1: and the RRU at one chain end receives the radio frequency signal of the user terminal, converts the radio frequency signal into a baseband signal and uploads the baseband signal to the BBU.
Step S2: and the BBU determines the moving direction of the user terminal according to the position of the RRU at the chain end for uploading the baseband signal, and allocates corresponding cell resources for the user terminal according to the determined moving direction.
Step S3: and the user terminal and the BBU carry out signal transmission based on the polarization receiving end of the cell resource distributed by the BBU and the RRU channel.
In the embodiment of the present invention, the determining, by the BBU, the moving direction of the user terminal according to the position of the RRU at the chain end of the uplink baseband signal includes:
if the BBU only receives the baseband signals uploaded by the RRUs at one end of the chain and does not receive the baseband signals uploaded by other RRUs except the two ends of the chain, the moving direction of the user terminal is determined to be the direction from one end of the chain to the other end of the chain.
Certainly, if the BBU receives baseband signals uploaded by two RRUs at two ends of the chain at the same time, it indicates that the user terminals in two moving directions access the network at this time, and respectively allocate cell resources to the user terminals in the two moving directions according to the positions of the two RRUs at two ends of the chain, and the user terminals in the two moving directions are allocated to two different cell resources.
In the embodiment of the present invention, the transmitting of signals between a user terminal and a BBU based on a polarization receiving end corresponding to a cell resource allocated by the BBU and a corresponding RRU channel includes:
in the uplink direction, a polarization receiving end of the allocated cell resource receives a radio frequency signal of a user terminal, the received radio frequency signal is sent to a corresponding RRU channel, and the RRU channel converts the radio frequency signal into a baseband signal and sends the baseband signal to a BBU;
and/or the presence of a gas in the gas,
in the downlink direction, the BBU sends the baseband signals to the RRU, the RRU converts the baseband signals into radio frequency signals through RRU channels of corresponding cell resources according to a cell where a user terminal corresponding to the baseband signals is located, and then outputs the radio frequency signals to corresponding polarization receiving terminals, and the corresponding polarization receiving terminals send the radio frequency signals to the corresponding user terminals.
At least a portion of the base station subsystem and signal transmission methods described in connection with fig. 4-8 may be implemented by a computing device. FIG. 9 shows a hardware framework diagram of a computing device of an embodiment of the invention. As shown in fig. 9, computing device 900 may include an input device 901, an input interface 902, a central processor 903, a memory 904, an output interface 905, and an output device 906. The input interface 902, the processor 903, the memory 904, and the output interface 905 are connected to each other via a bus 910, and the input device 901 and the output device 906 are connected to the bus 910 via the input interface 902 and the output interface 905, respectively, and further connected to other components of the computing device 900. Specifically, the input device 901 receives input information from the outside and transmits the input information to the processor 903 through the input interface 902; the processor 903 processes the input information based on computer-executable instructions stored in the memory 904 to generate output information, stores the output information in the memory 904 temporarily or permanently, and then transmits the output information to the output device 906 via the output interface 905; output device 906 outputs the output information external to computing device 900 for use by a user.
That is, the computing device 900 shown in fig. 9 may be implemented as a base station device comprising: a processor and a memory. The memory is used for storing executable program codes; the processor is used for reading the executable program codes stored in the memory to execute the signal transmission method of the above embodiment.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer instruction is stored in the computer-readable storage medium, and when the computer instruction runs on a computer, the computer is caused to execute the signal transmission method provided by the embodiment of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A base station subsystem is characterized in that the base station subsystem comprises a base band processing unit (BBU) and more than three chain-covered dual-channel Radio Remote Units (RRUs) connected with the BBU, two channels of one RRU are respectively connected with two ports of a dual-polarized antenna, polarization receiving ends of all dual-polarized antennas in one polarization direction except the dual-polarized antennas corresponding to the RRUs at two chain-shaped ends are configured to be a first cell, and polarization receiving ends in the other polarization direction are configured to be a second cell, wherein the first cell provides service for a user terminal in a first moving direction, the second cell provides service for a user terminal in a second moving direction, and the first moving direction is opposite to the second moving direction;
the BBU is used for receiving a baseband signal of a user terminal uploaded by the RRU at one chain end, determining the moving direction of the user terminal according to the position of the RRU at the one chain end for uploading the baseband signal, and allocating corresponding first cell resources or second cell resources to the user terminal according to the determined moving direction.
2. The base station subsystem according to claim 1, wherein all polarized receivers of said first cell resource are cascaded and all polarized receivers of said second cell resource are cascaded.
3. The base station subsystem of claim 1, wherein the RRUs are linearly distributed along the high speed railway in a chain shape, and the user terminal is a high speed railway user terminal.
4. The base station subsystem according to claim 1, wherein the handover between two adjacent first cells and the handover between two adjacent second cells are configured as unidirectional handover, the handover direction between two adjacent first cells is the first moving direction, and the handover direction between two adjacent second cells is the second moving direction.
5. A base station subsystem according to any of claims 1 to 4, wherein said dual polarised antenna is a plus or minus 45 degree dual polarised antenna or a vertical horizontal dual polarised antenna.
6. A signal transmission method based on the base station subsystem as claimed in claim 1, comprising:
the RRU at one chain end receives a radio frequency signal of a user terminal, converts the radio frequency signal into a baseband signal and uploads the baseband signal to the BBU;
the BBU determines the moving direction of the user terminal according to the position of the RRU at the chain end for uploading the baseband signal, and allocates corresponding cell resources to the user terminal according to the determined moving direction;
and the user terminal and the BBU carry out signal transmission based on the polarization receiving end of the cell resource distributed by the BBU and the RRU channel.
7. The signal transmission method according to claim 6, wherein the determining, by the BBU, the moving direction of the user terminal according to the position of the RRU at the chain end that uploads the baseband signal includes:
and if the BBU only receives the baseband signals uploaded by the RRUs at one end of the chain and does not receive the baseband signals uploaded by other RRUs except the two ends of the chain, determining the moving direction of the user terminal to be the direction from one end of the chain to the other end of the chain.
8. The signal transmission method according to claim 6, wherein the transmitting of the signal between the user terminal and the BBU based on the RRU channel and a polarization receiving end of the cell resource allocated by the BBU comprises:
in the uplink direction, the polarization receiving end of the allocated cell resource receives the radio frequency signal of the user terminal and sends the received radio frequency signal to a corresponding RRU channel, and the RRU channel converts the radio frequency signal into a baseband signal and then sends the baseband signal to the BBU;
and/or the presence of a gas in the gas,
in the downlink direction, the BBU sends the baseband signals to the RRU, the RRU converts the baseband signals into radio frequency signals through RRU channels of corresponding cell resources according to a cell where a user terminal corresponding to the baseband signals is located, and then outputs the radio frequency signals to corresponding polarization receiving terminals, and the corresponding polarization receiving terminals send the radio frequency signals to the corresponding user terminals.
9. A base station device comprising a memory and a processor;
the memory is used for storing executable program codes;
the processor, configured to read executable program code stored in the memory to perform the signal transmission method according to any one of claims 6 to 8.
10. A computer-readable storage medium having stored therein computer instructions which, when run on a computer, cause the computer to perform the signal transmission method of any one of claims 6 to 8.
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| CN109672989A (en) * | 2018-12-26 | 2019-04-23 | 中国联合网络通信集团有限公司 | Indoor distributed system |
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