CN108184238B - Data transmission method and device - Google Patents
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- CN108184238B CN108184238B CN201611123759.4A CN201611123759A CN108184238B CN 108184238 B CN108184238 B CN 108184238B CN 201611123759 A CN201611123759 A CN 201611123759A CN 108184238 B CN108184238 B CN 108184238B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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Abstract
The invention discloses a data transmission method and a data transmission device. The method comprises the following steps: in the sending direction, each baseband unit processes data of a preset number of virtual cells and sends the processed data to an interface unit; the virtual cell is a logic cell divided by the high-frequency cell according to the number of subframes contained in the super subframe in the communication system; the interface unit caches the received data of the baseband unit and sends the data of all the baseband units to the radio frequency unit in a frame period of a super subframe; and/or, in the receiving direction, the interface unit receives and buffers the data sent by the radio frequency unit, and distributes the buffered data to each baseband unit according to a predetermined sequence in the frame period of a super subframe; the baseband unit receives the data sent by the interface unit and distributes the data to each virtual cell. The invention makes full use of a plurality of baseband boards with low processing capacity, so that the baseband boards can serve one high-frequency cell and meet the processing requirements of high frequency and large bandwidth.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method and apparatus for a high-frequency large-bandwidth communication system.
Background
In the UTRAN (UMTS Terrestrial Radio Access Network) and LTE (Long Term Evolution) mobile communication system of the third generation, the used frequency band is generally not more than 4GHz, and most of the frequency bands are below 3GHz, and most of the frequency bands are already occupied, but the utilization rate of the high frequency band is very low at present. The frequency band of mobile communication is increased to more than 10G, even more than 20G, and the available bandwidth can be allocated in advance, the bandwidth can reach 500MHz, even can exceed 1GHz, and the requirements on the processing capacity of a baseband and the storage of radio frequency are high. However, in general, the problem is solved by increasing the baseband processing capability of a single baseband board by times, which will inevitably affect the hardware structure of the system and result in high hardware cost.
Disclosure of Invention
The invention provides a data transmission method and a data transmission device, which are used for solving the problem of high hardware cost caused by processing by a single baseband board when ultrahigh frequency band is adopted for communication in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided a data transmission method, including:
in the sending direction, each baseband unit processes data of a preset number of virtual cells and sends the processed data to an interface unit; the virtual cell is a cell divided by a high-frequency cell according to the number of subframes contained in a super subframe in a communication system; the interface unit caches the received data of the baseband unit and sends the data of all the baseband units to the radio frequency unit in a frame period of a super subframe; and/or the presence of a gas in the gas,
in the receiving direction, the interface unit receives and buffers the data sent by the radio frequency unit, and distributes the buffered data to each baseband unit according to a preset sequence in a frame period of a super subframe; and the baseband unit receives the data sent by the interface unit and distributes the data to each virtual cell.
Further, when the baseband unit sends data to the interface unit or the interface unit sends data to the baseband unit, time-sharing sending is performed according to preset segmentation time; and the preset segmentation moment is determined according to the frame period and the number of the baseband units.
Further, the number of the baseband units is determined according to the number of the virtual cells and the number of the virtual cells processed by each baseband unit.
Further, when buffering the received data, the interface unit uses a set of data buffer areas for buffering in the sending direction and the receiving direction respectively.
Furthermore, the data cache region comprises two storage modules, and the storage space of each storage module is at least k × s symbols; wherein k is a preset number of virtual cells processed by the baseband unit; s is the number of symbols contained in the super-subframe.
According to an aspect of the present invention, there is provided a data transmission apparatus including:
the base band units are used for processing data of a preset number of virtual cells in the sending direction and sending the processed data to the interface units, wherein the virtual cells are cells divided by high-frequency cells according to the number of subframes contained in super subframes in the communication system; and/or, in the receiving direction, the receiving unit is configured to receive the data of the interface unit and distribute the received data to each virtual cell;
the interface unit is used for caching the received data of the baseband unit in the sending direction and sending the data of all the baseband units to the radio frequency unit in the frame period of a super subframe; and/or, in the receiving direction, the receiving unit is configured to receive and buffer the data sent by the radio frequency unit, and distribute the buffered data to each baseband unit according to a predetermined sequence in a frame period of a super subframe;
the radio frequency unit is used for transmitting the super subframe sent by the interface unit in the sending direction; and/or, in the receiving direction, for sending the received data to the interface unit.
Further, the baseband unit is configured to perform time-sharing transmission according to a preset segment time when transmitting data to the interface unit; the preset segmentation moment is determined according to the frame period and the number of the baseband units.
Further, the interface unit is configured to perform time-sharing transmission according to the preset segment time when transmitting data to the baseband unit; the preset segmentation moment is determined according to the frame period and the number of the baseband units.
Further, the interface unit is configured to use a set of data buffer areas for buffering in the sending direction and the receiving direction when buffering the received data.
Furthermore, the data cache region comprises two storage modules, and the storage space of each storage module is at least k × s symbols; wherein k is a preset number of virtual cells processed by the baseband unit; s is the number of symbols contained in the super-subframe.
The invention has the following beneficial effects:
the data transmission method and the data transmission device divide a large-bandwidth cell into a plurality of virtual cells with small bandwidths, and use a plurality of baseband boards to process the virtual cells in parallel, thereby reducing the baseband processing capacity requirement of each baseband board and reducing the hardware cost of the system. In addition, the data of a plurality of groups of virtual cells are transmitted in a segmented manner on a link, and the data of the virtual cells are respectively stored by using 2 independent storage modules in the receiving direction and the sending direction, so that the data transmission of the plurality of groups of virtual cells can be completed, the cache requirement on the radio frequency side is obviously reduced, and the method is conveniently expanded to a high-frequency large-bandwidth mobile communication system.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a data transmission method for a sending direction according to an embodiment of the present invention;
fig. 2 is a flowchart of a data transmission method for a receiving direction according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a data format transmitted from a baseband unit to an interface unit according to an embodiment of the present invention;
FIG. 4 shows a data format transmitted from the interface unit to the baseband unit according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of a data transmission apparatus provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the above-mentioned problem of high hardware cost caused by improving the capability of the baseband board when the high frequency band is adopted, an embodiment of the present invention provides a data transmission method. The method is used in a communication system comprising a plurality of baseband units, interface units and radio frequency units. As shown in fig. 1, the data transmission method in the transmission direction includes:
step 101, each baseband unit processes data of a preset number of virtual cells and sends the processed data to an interface unit; the virtual cell is a cell divided by a high-frequency cell according to the number of subframes contained in a super subframe in the communication system. And the high frequency cell refers to a physical cell adopting a high frequency signal larger than 10 Ghz.
And step 102, the interface unit buffers the received data of the baseband unit and sends the data of all the baseband units to the radio frequency unit in a frame period of a super subframe.
As shown in fig. 2, the data transmission method in the receiving direction includes:
step 201, an interface unit receives and buffers data sent by a radio frequency unit, and distributes the buffered data to each baseband unit according to a predetermined sequence in a frame period of a super subframe;
step 202, the baseband unit receives the data sent by the interface unit and distributes the data to each virtual cell.
It can be known that, in the embodiment of the present invention, the high frequency cell is divided into a plurality of virtual cells according to the number of subframes included in a super subframe in the communication system, and when the communication system is directed to a high frequency large bandwidth (frequency point is greater than 10Ghz, and bandwidth is greater than 100 Mhz), the high frequency cell of a large bandwidth can be divided into a plurality of virtual cells with small bandwidth; and these virtual cells can be processed by a plurality of baseband units in parallel, which can effectively reduce the processing requirement of each baseband unit and reduce the hardware cost of the system.
Optionally, the baseband unit performs time-sharing transmission according to a preset segment time when transmitting data to the interface unit or when the interface unit transmits data to the baseband unit. By sending data in a time-sharing manner, the link delay caused by sending or receiving data of all baseband units by the interface unit can be effectively avoided.
The preset segmentation moment is determined according to the frame period and the number of the baseband units. The number of the baseband units is determined according to the number of the virtual cells and the number of the virtual cells which can be processed by each baseband unit. And the number of the virtual cells processed by each baseband unit is set according to the actual situation. Of course, the baseband unit and the interface unit may also adopt a processing mode of simultaneous transmission besides transmitting according to the preset segmentation time, and the present invention is not limited specifically.
For example, the processing capacity of each baseband unit is 2 virtual cells. The number of virtual cells divided by the current high-frequency cell is 10, and then 5 baseband units are needed. While the frame period of the current super-subframe is 1ms, 5 baseband units require 5 segmentation instants. The sequence of sending data is preset by each baseband unit, and each baseband unit only needs to send data according to the appointed section time.
In order to reduce the buffer space of the interface unit and speed up the processing capability of the interface unit, in an embodiment of the present invention, two sets of data buffer areas are disposed in the interface unit. In the sending direction, when the interface unit buffers the received data, one group of data buffer areas buffers the received data; and in the receiving direction, when the received data is buffered, the received data is buffered by another group of data buffer areas.
Each group of data buffer area adopts a ping-pong buffer mode and comprises 2 storage modules. When the received data are cached, the 2 storage modules switch and cache the received data in a time-sharing mode. Wherein each memory module requires at least k x s symbols; wherein k is the number of processing virtual cells of each baseband unit; s is the number of symbols contained in each super-subframe.
Of course, the interface unit may also buffer all the received data, but the hardware cost of the interface unit is relatively increased, and the complexity of the interface unit for processing data is also increased. Therefore, each data buffer area of the invention adopts 2 storage modules to switch the buffer in a time-sharing way, which can effectively reduce the buffer requirement at the radio frequency side and is convenient for expanding to the mobile communication with high frequency and large bandwidth.
The technical contents of the present invention will be described in detail below with reference to the accompanying drawings and a specific embodiment.
In this embodiment, the frame period of the ultra-high frequency large bandwidth communication system is 10ms, and the maximum frame period can be divided into 10 super-subframes. Wherein each super-subframe is 1ms, and there are n subframes in each super-subframe, and the number of n is usually greater than 1. There are 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols in each super-subframe.
The 1 high frequency cell is divided into n virtual cells. Each baseband unit can handle k virtual cells. Therefore, i (i = n/k) baseband units are required in total to process n virtual cells. Wherein, the baseband unit processes k virtual cells, and the number of the processed antennas is j i . Transmitting k virtual cells j on each baseband unit and interface unit link in 1ms time i 14 symbols of data of the root antenna, and, at the same time, divides a time of 1ms into i,i segment instants. Each time of segmentation, one baseband unit is required to transmit data of j antennas of k virtual cells. The i baseband units start to transmit and receive effective data at different times.
Specifically, in the transmission direction, the transmission time of each baseband unit is advanced by the segmentation timing 1/ims, and according to the preset baseband unit, the first baseband unit is transmitted first, and the last baseband unit is transmitted last, specifically, the baseband is shown in fig. 3. After the baseband unit sends the data to the interface unit, the interface unit receives the data of i baseband units by using 2 buffer spaces with at least k × s symbols, and extracts the data according to the antenna to form (j) 1 +j 2 ……j n ) And the data streams of the n virtual cell single antennas are sent to the radio frequency unit, and are sent to an air interface for sending after the radio frequency unit performs medium radio frequency processing.
In the receiving direction, the radio frequency unit receives data from the air interface, processes the data through radio frequency intermediate frequency and sends the data to the interface unit. The interface unit receives (j) from the radio unit 1 +j 2 ……j i ) And the data of the single antenna of the n separated virtual cells is divided into j antenna data of i k virtual cells, and 2 buffer spaces with at least k s symbols are used for buffering. J of i k virtual cells within 1ms i And transmitting the data of the root antenna in a time-sharing manner. Specifically, as shown in fig. 4, the data is transmitted with a delay of 1/ims at each segment time, and the data is distributed to the links of the corresponding baseband units, where the data required by the leading baseband unit is transmitted first, and the data required by the trailing baseband unit is transmitted last. After each baseband unit receives the required data, the data is distributed to k virtual cells.
An embodiment of the present invention further provides a data transmission apparatus, as shown in fig. 5, including a plurality of baseband units 51, an interface unit 52, and a radio frequency unit 53; wherein the content of the first and second substances,
the multiple baseband units 51 are configured to, in a sending direction, process data of a preset number of virtual cells, and send the processed data to the interface unit 52, where a virtual cell is a cell divided by a high-frequency cell according to the number of subframes included in a super subframe in the communication system; and/or, in the receiving direction, configured to receive data of the interface unit 52 and distribute the received data to each virtual cell;
the interface unit 52 is configured to buffer the received data of the baseband unit 51 in the transmission direction, and transmit the data of all the baseband units 51 to the radio frequency unit in a frame period of a super subframe; and/or, in the receiving direction, the receiving unit is configured to receive and buffer the data sent by the radio frequency unit, and distribute the buffered data to each baseband unit 51 according to a predetermined sequence in a frame period of a super subframe;
a radio frequency unit 53, configured to transmit, in the transmission direction, the super-subframe sent by the interface unit 52; and/or, in the receive direction, for sending received data to the interface unit 52.
Specifically, the baseband unit 51 is mainly used for data exchange with the interface unit. A transmitting direction, which reads data from the data buffer of the baseband unit and transmits the data to the interface unit 52 according to a transmission format; in the receiving direction, the interface unit 52 sends the data to the baseband unit 51 according to the transmission format, and the baseband unit 51 performs buffering. The interface unit 52 is used for data transfer function between a plurality of baseband units and radio frequency units. A transmitting direction for receiving data from the baseband unit, converting the data into a format required by the radio frequency, and transmitting the converted data to the radio frequency unit 53; in the receiving direction, data is received from the radio unit 53, converted into a format required by the baseband, and transmitted to the baseband unit 51. The radio frequency unit 53 is configured to exchange data with the interface unit 53: in the sending direction, after receiving the input data of the interface unit 52, performing intermediate radio frequency processing, and sending to the air interface; and the data received from the air interface is processed by radio frequency intermediate frequency and then sent to the interface unit 52.
The baseband unit 51 is configured to perform time-sharing transmission according to a preset segmentation time when transmitting data to the interface unit 52; an interface unit 52, configured to perform time-sharing transmission according to a preset segment time when transmitting data to the baseband unit 51; the preset segmentation time is determined according to the frame period and the number of the baseband units 51. The number of baseband units 51 is determined according to the number of virtual cells and the number of virtual cells processed by each baseband unit 51.
The interface unit 52 is configured to buffer the received data by using a set of data buffer in the transmitting direction and a set of data buffer in the receiving direction. In two groups of data cache regions in the interface unit 52, each group of data cache region includes two storage modules, and the storage space of each storage module is at least k × s symbols; wherein k is the preset number of the processing virtual cells of the baseband unit; s is the number of symbols contained in the super-subframe.
In summary, when the data transmission method and apparatus provided in the embodiments of the present invention are applied to a high-frequency and large-bandwidth communication system, a large-bandwidth cell can be divided into multiple small-bandwidth virtual cells, and multiple baseband boards are used to process the virtual cells in parallel, so as to reduce the baseband processing capability requirement for each baseband board; and the data of a plurality of groups of virtual cells are transmitted in a segmented manner on a link, and the sending and receiving directions respectively use 2 storage modules to respectively store the data of the virtual cells, so that the bidirectional data transmission of the plurality of groups of virtual cells can be completed, the cache requirement on the radio frequency side is obviously reduced, and the method is convenient to expand to the mobile communication with high frequency and large bandwidth.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For system embodiments, since they are substantially similar to method embodiments, reference may be made to some of the descriptions of method embodiments for relevant points. Also, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In addition, those skilled in the art will appreciate that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing associated hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of data transmission, comprising:
in the sending direction, each baseband unit processes data of a preset number of virtual cells and sends the processed data to an interface unit; the virtual cell is a cell divided by a high-frequency cell according to the number of subframes contained in a super subframe in a communication system; the interface unit caches the received data of the baseband unit and sends the data of all the baseband units to the radio frequency unit in a frame period of a super subframe; and/or the presence of a gas in the gas,
in the receiving direction, the interface unit receives and buffers the data sent by the radio frequency unit, and distributes the buffered data to each baseband unit according to a predetermined sequence in a frame period of a super subframe; and the baseband unit receives the data sent by the interface unit and distributes the data to each virtual cell.
2. The method of claim 1, wherein the time-division transmission is performed according to a preset segmentation time when the baseband unit transmits data to the interface unit or the interface unit transmits data to the baseband unit; the preset segmentation moment is determined according to the frame period and the number of the baseband units.
3. The method of claim 2, wherein the number of baseband units is determined based on the number of virtual cells and the number of virtual cells processed by each baseband unit.
4. The method of claim 1, wherein the interface unit buffers the received data using a set of data buffers in each of a transmit direction and a receive direction.
5. The method of claim 4, wherein the data buffer comprises two memory modules, each memory module having a memory space of at least k x s symbols; wherein k is a preset number of virtual cells processed by the baseband unit; s is the number of symbols contained in the super-subframe.
6. A data transmission apparatus, comprising:
the base band units are used for processing data of a preset number of virtual cells in the sending direction and sending the processed data to the interface units, wherein the virtual cells are cells divided by high-frequency cells according to the number of subframes contained in super subframes in the communication system; and/or, in the receiving direction, the receiving unit is configured to receive the data of the interface unit and distribute the received data to each virtual cell;
the interface unit is used for caching the received data of the baseband unit in the sending direction and sending the data of all the baseband units to the radio frequency unit in the frame period of a super subframe; and/or, in the receiving direction, the receiving unit is configured to receive and buffer the data sent by the radio frequency unit, and distribute the buffered data to each baseband unit according to a predetermined sequence in a frame period of a super subframe;
the radio frequency unit is used for transmitting the super subframe sent by the interface unit in the sending direction; and/or, in the receiving direction, for sending the received data to the interface unit.
7. The apparatus as claimed in claim 6, wherein the baseband unit is configured to perform time division transmission according to a preset segmentation time when transmitting data to the interface unit; the preset segmentation moment is determined according to the frame period and the number of the baseband units.
8. The apparatus of claim 6, wherein the interface unit is configured to perform time division transmission according to the preset segmentation time when transmitting data to the baseband unit; the preset segmentation moment is determined according to the frame period and the number of the baseband units.
9. The apparatus of claim 6, wherein the interface unit is configured to buffer the received data using a set of data buffers in each of a transmit direction and a receive direction.
10. The apparatus of claim 9, wherein the data buffer comprises two memory modules, each memory module having a memory space of at least k x s symbols; wherein k is a preset number of virtual cells processed by the baseband unit; and s is the number of symbols contained in the super subframe.
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| CN201611123759.4A CN108184238B (en) | 2016-12-08 | 2016-12-08 | Data transmission method and device |
| PCT/CN2017/114453 WO2018103605A1 (en) | 2016-12-08 | 2017-12-04 | Data transmission method and device |
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| CN201611123759.4A CN108184238B (en) | 2016-12-08 | 2016-12-08 | Data transmission method and device |
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| CN102833800B (en) * | 2011-06-16 | 2017-03-29 | 中兴通讯股份有限公司 | Cell switching method and device |
| JP5796448B2 (en) * | 2011-10-07 | 2015-10-21 | ソニー株式会社 | Wireless communication apparatus, wireless communication method, and wireless communication system |
| CN102547994A (en) * | 2012-01-18 | 2012-07-04 | 中兴通讯股份有限公司 | Method and system for eliminating inter-cell interference |
| EP2807852B8 (en) * | 2012-01-24 | 2019-08-14 | NEC Corporation | Radio communication system |
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| US9461727B2 (en) * | 2013-09-05 | 2016-10-04 | Intel Corporation | Adaptive sectorization of a spational region for parallel multi-user transmissions |
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