CN109561501B - Duplex data transmission method, base station and terminal - Google Patents
Duplex data transmission method, base station and terminal Download PDFInfo
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- CN109561501B CN109561501B CN201710875180.1A CN201710875180A CN109561501B CN 109561501 B CN109561501 B CN 109561501B CN 201710875180 A CN201710875180 A CN 201710875180A CN 109561501 B CN109561501 B CN 109561501B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
Abstract
The application provides a duplex data transmission method, a base station and a terminal, and relates to the technical field of wireless communication. The duplex data transmission method provided by the application comprises the following steps: a base station modulates downlink data in a downlink frequency band to generate a downlink signal, wherein the central frequency of the downlink frequency band is the same as the central frequency of a preset frequency band allocated to a user; a base station acquires an uplink signal in an uplink frequency band, wherein the central frequency of the uplink frequency band is the same as the central frequency of a preset frequency band allocated to a user; the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped. By the method, the center frequencies of the uplink and downlink frequency bands are respectively the same as the center frequency of the preset frequency band allocated to the user in the interaction process of the base station and the terminal, so that the non-symmetrical allocation of the uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently allocated to the asymmetrical service, and the utilization rate of the frequency spectrum resources is improved.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a duplex data transmission method, a base station, and a terminal.
Background
FDD (Frequency Division duplex) and TDD (Time Division duplex) are the most dominant duplex schemes used in wireless communication systems.
In the operating principle, FDD receives and transmits on two separate symmetric frequency channels. FDD must use paired frequencies, relying on frequency to distinguish between uplink and downlink, whose unidirectional resources are contiguous in time. TDD separates reception and transmission channels by time, and reception and transmission use different time slots of the same frequency carrier as bearers of the channels, and its unidirectional resources are discontinuous in time and time resources are allocated in both directions. In a certain time period, the base station sends signals to the mobile station, in other time, the mobile station sends signals to the base station, and the base station and the mobile station have to cooperate to work smoothly.
In future wireless communication systems (such as 5G), higher requirements are put on performance indexes of signal transmission, such as time delay, spectrum utilization rate and the like, and higher requirements are also put on the performance of duplex transmission.
Disclosure of Invention
The inventors have found that in the TDD scheme, DL (DownLink)/UL (UpLink) cannot be transmitted simultaneously, and transmission can be performed only in a predetermined time slot, which causes a problem of an increase in delay due to waiting.
Although FDD can better solve the delay problem, and can fully utilize the uplink and downlink frequency spectrum when supporting the symmetric service, the frequency spectrum utilization rate is greatly reduced when supporting the asymmetric service.
One object of the present application is to improve the spectrum utilization rate of the concurrent transmission of uplink and downlink signals of asymmetric services.
According to an aspect of the present application, a duplex data transmission method is provided, including: the base station modulates downlink data into a downlink frequency band to generate a downlink signal, wherein the central frequency of the downlink frequency band is the same as the central frequency of a preset frequency band allocated to a user; a base station acquires an uplink signal in an uplink frequency band, wherein the central frequency of the uplink frequency band is the same as the central frequency of a preset frequency band allocated to a user; the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
Optionally, the uplink frequency band is located in the middle of the predetermined frequency band, and the downlink frequency band is located on both sides of the predetermined frequency band.
Optionally, the downlink frequency band is located in the middle of the predetermined frequency band, and the uplink frequency band is located on both sides of the predetermined frequency band.
Optionally, the uplink signal and the downlink signal respectively occupy all time domain resources of their respective frequency domains.
Optionally, a guard bandwidth is included between the uplink frequency band and the downlink frequency band.
Optionally, the method further comprises: and sending a first duplex mode switching instruction to the terminal so that the terminal determines that the configured downlink frequency band, the downlink frequency band and the center frequency of the preset frequency band are the same.
Optionally, a second duplex mode switching instruction is sent to the terminal, so that the terminal determines that the configured downlink frequency band and the configured uplink frequency band are symmetrical with the center frequency of the predetermined frequency band as a center.
Optionally, a third duplex mode switching instruction is sent to the terminal, so that the terminal determines to perform uplink and downlink signal transmission in a time division duplex manner.
Optionally, the first duplex mode switching instruction includes indication information of a predetermined frequency band.
Optionally, the first duplex mode switching instruction includes uplink frequency band bandwidth indication information and/or downlink frequency band bandwidth indication information.
Optionally, the base station adjusts the uplink frequency band bandwidth and/or the downlink frequency band bandwidth in real time according to the uplink and downlink data load conditions, and sends the uplink frequency band bandwidth and/or the downlink frequency band bandwidth to the terminal through the first duplex mode switching instruction.
According to another aspect of the present application, a duplex data transmission method is provided, including: the terminal modulates uplink data in an uplink frequency band to generate an uplink signal, wherein the central frequency of the uplink frequency band is the same as the central frequency of a preset frequency band allocated to a user; a terminal acquires a downlink signal in a downlink frequency band, wherein the center frequency of the downlink frequency band is the same as the center frequency of a preset frequency band allocated to a user; the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
Optionally, the uplink frequency band is located in the middle of the predetermined frequency band, and the downlink frequency band is located on both sides of the predetermined frequency band.
Optionally, the downlink frequency band is located in the middle of the predetermined frequency band, and the uplink frequency band is located on both sides of the predetermined frequency band.
Optionally, the uplink signal and the downlink signal respectively occupy all time domain resources of their respective frequency domains.
Optionally, a guard bandwidth is included between the uplink frequency band and the downlink frequency band.
Optionally, the method further comprises: and determining that the central frequencies of the configured downlink frequency band, the downlink frequency band and the preset frequency band are the same according to the first duplex mode switching instruction from the base station.
Optionally, the method further comprises: and determining that the configured downlink frequency band and the configured uplink frequency band are symmetrical by taking the center frequency of the preset frequency band as the center according to a second duplex mode switching instruction from the base station.
Optionally, the method further comprises: and determining to adopt a time division duplex mode to carry out uplink and downlink signal transmission according to a third duplex mode switching instruction from the base station.
Optionally, the first duplex mode switching instruction includes indication information of a predetermined frequency band, and the predetermined frequency band is determined according to the indication information of the predetermined frequency band.
Optionally, the first duplex mode switching instruction includes uplink frequency band bandwidth indication information and/or downlink frequency band bandwidth indication information, and the uplink frequency band and the downlink frequency band are calculated according to the uplink frequency band bandwidth indication information and/or the downlink frequency band bandwidth indication information.
Optionally, the method further comprises: and the terminal transmits information of a channel Sounding Reference Signal (SRS), a demodulation reference signal (DMRS) and a Physical Uplink Shared Channel (PUSCH) in a discontinuous bandwidth in a time division multiplexing mode.
By the method, the center frequencies of the uplink and downlink frequency bands are respectively the same as the center frequency of the preset frequency band allocated to the user in the interaction process of the base station and the terminal, so that the non-symmetrical allocation of the uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently allocated to the asymmetrical service, and the utilization rate of the frequency spectrum resources is improved.
According to another aspect of the present application, a base station is provided, including: a downlink signal generating unit, configured to modulate downlink data in a downlink frequency band to generate a downlink signal, where a center frequency of the downlink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user; an uplink signal acquisition unit, configured to acquire an uplink signal in an uplink frequency band, where a center frequency of the uplink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user; the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
According to yet another aspect of the present application, a base station is provided, comprising a memory; and a processor coupled to the memory, the processor configured to perform the steps performed by the base station in any of the duplex data transmission methods mentioned above based on instructions stored in the memory.
In the interaction process of the base station and the terminal, the central frequencies of the uplink and downlink frequency bands are respectively the same as the central frequencies of the preset frequency bands allocated to the users, so that the non-symmetrical allocation of uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently allocated to the asymmetrical services, and the utilization rate of the frequency spectrum resources is improved.
According to another aspect of the present application, a terminal is provided, including: an uplink signal generating unit, configured to modulate uplink data in an uplink frequency band, and generate an uplink signal, where a center frequency of the uplink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user; a downlink signal acquiring unit, configured to acquire a downlink signal in a downlink frequency band, where a center frequency of the downlink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user; the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
According to one aspect of the present application, a terminal is provided, including: a memory; and a processor coupled to the memory, the processor configured to perform the steps performed by the terminal in implementing any of the duplex data transmission methods mentioned above based on instructions stored in the memory.
In the interaction process of the terminal and the base station, the central frequencies of the uplink and downlink frequency bands are respectively the same as the central frequencies of the preset frequency bands allocated to the users, so that the non-symmetrical allocation of uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently allocated to the asymmetrical services, and the utilization rate of the frequency spectrum resources is improved.
According to another aspect of the present application, a computer-readable storage medium is proposed, on which computer program instructions are stored, which instructions, when executed by a processor, implement the steps of any one of the duplex data transmission methods mentioned above.
The computer readable storage medium executes the instructions thereon, and the center frequencies of the uplink and downlink frequency bands are respectively the same as the center frequency of the predetermined frequency band allocated to the user, so that the non-mutually symmetrical allocation of the uplink and downlink signals is realized, the non-equivalent spectrum resources can be conveniently allocated to the asymmetrical service, and the utilization rate of the spectrum resources is improved.
In addition, according to an aspect of the present application, there is provided a duplex data transmission system, including: any of the base stations mentioned above and any of the terminals mentioned above.
In the duplex data transmission system, the central frequencies of the uplink and downlink frequency bands are respectively the same as the central frequency of the preset frequency band allocated to the user, so that the non-symmetrical allocation of the uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently allocated to the asymmetrical service, and the utilization rate of the frequency spectrum resources is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of an embodiment of a duplex data transmission method according to the present application.
Fig. 2A is a schematic diagram of an embodiment of spectrum allocation in the duplex data transmission method of the present application.
Fig. 2B is a schematic diagram of another embodiment of spectrum allocation in the duplex data transmission method of the present application.
Fig. 3 is a flowchart of another embodiment of a duplex data transmission method according to the present application.
Fig. 4 is a schematic diagram of an embodiment of a base station of the present application.
Fig. 5 is a schematic diagram of an embodiment of a terminal of the present application.
Fig. 6 is a schematic diagram of another embodiment of a terminal or a base station of the present application.
Fig. 7 is a schematic diagram of another embodiment of a terminal or a base station of the present application.
Fig. 8 is a schematic diagram of an embodiment of a duplex data transmission system according to the present application.
Fig. 9A is a schematic diagram of an embodiment of a signaling occupied frequency band in a duplex data transmission system according to the present application.
Fig. 9B is a schematic diagram of another embodiment of frequency bands occupied by signaling in the duplex data transmission system according to the present application.
Detailed Description
The technical solution of the present application is further described in detail by the accompanying drawings and examples.
A flowchart of an embodiment of a duplex data transmission method of the present application is shown in fig. 1.
In step 101, the base station modulates downlink data into a downlink frequency band to generate a downlink signal, where a center frequency of the downlink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user.
In step 102, the base station acquires an uplink signal in an uplink frequency band, wherein a center frequency of the uplink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user. The sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
In one embodiment, as shown in fig. 2A, 21 is the center band and 22 is the double-sided band. The central dashed line shows the center frequency, the direction of arrow f is the frequency domain direction, and the direction of arrow t is the time domain direction. The central frequency band 21 may be an uplink frequency band, and the bilateral frequency bands 22 are downlink frequency bands; the central frequency band 21 may be used as a downlink frequency band, and the double-sided frequency bands 22 may be used as uplink frequency bands.
In another embodiment, as shown in fig. 2B, a guard band 23 is included between the central band 21 and the dual-sided band 22, so that interference of uplink and downlink signals can be avoided, and signal quality can be improved.
By the method, the center frequency of the downlink signal generated by the base station is the same as the center frequency of the preset frequency band allocated to the user, and the base station can receive the uplink signal of which the center frequency from the terminal is the same as the center frequency of the preset frequency band allocated to the user, so that the non-symmetrical allocation of the uplink signal and the downlink signal is realized, the non-equivalent spectrum resources can be conveniently allocated to the asymmetrical service, and the utilization rate of the spectrum resources is improved.
A flow chart of another embodiment of the duplex data transmission method of the present application is shown in fig. 3.
In step 301, the terminal modulates uplink data into an uplink frequency band to generate an uplink signal, where a center frequency of the uplink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user.
In step 302, the terminal acquires a downlink signal in a downlink frequency band, where a center frequency of the downlink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user. The uplink and downlink signals may be allocated spectrum resources in the manner shown in fig. 2A and 2B.
By the method, the center frequency of the uplink signal generated by the terminal is the same as the center frequency of the preset frequency band allocated to the user, and the terminal can receive the downlink signal of which the center frequency from the base station is the same as the center frequency of the preset frequency band allocated to the user, so that the non-symmetrical allocation of the uplink signal and the downlink signal is realized, the non-equivalent spectrum resources can be conveniently allocated to the asymmetrical service, and the utilization rate of the spectrum resources is improved.
In one embodiment, the uplink frequency band and the downlink frequency band implement resource allocation in the frequency domain, and both the uplink signal and the downlink signal can occupy all time domain resources of the allocated frequency domain, so that data transmission is not required to be performed in a time division duplex manner, and time delay is reduced.
In one embodiment, the base station and the terminal can configure a plurality of modes, and the mode switching is performed by transmitting a mode switching instruction.
In an embodiment, the base station may send a first duplex mode switching instruction to the terminal, after receiving the first duplex mode switching instruction, the terminal configures the downlink frequency band, and the center frequency of the predetermined frequency band to be the same, and the base station and the terminal perform uplink and downlink signal transmission in the manner described in the embodiments shown in fig. 1 and 3. By the method, the base station can configure the terminal to adopt the duplex mode with the same center frequency of the downlink frequency band, the downlink frequency band and the preset frequency band for data transmission, and the utilization rate of frequency resources is improved. The design that the center frequencies of the uplink frequency band, the downlink frequency band and the preset frequency band are the same can avoid the change of a synchronization process on the basis of the prior art, and is beneficial to the compatibility of the prior network and the switching among different modes.
In an embodiment, the first duplex mode switching instruction may include predetermined frequency band indication information, and the terminal determines a frequency band allocated to the terminal according to the predetermined frequency band indication information, and determines an uplink frequency band and a downlink frequency band according to a predetermined uplink and downlink bandwidth allocation condition.
In another embodiment, the first duplex mode switching instruction may include uplink band bandwidth indication information and/or downlink band bandwidth indication information, and the terminal determines the uplink band and the downlink band according to the information. In one embodiment, the base station adjusts the uplink frequency band bandwidth and/or the downlink frequency band bandwidth in real time according to the uplink and downlink data load conditions, and sends the uplink frequency band bandwidth and/or the downlink frequency band bandwidth to the terminal through the first duplex mode switching instruction. For example, the total bandwidth of the frequency band is 100M, and the uplink and downlink loads of the system are 1: 2, determining that the uplink and downlink bandwidths are respectively 30M (15M at the upper and lower ends), the downlink bandwidth is 60M, and the guard bandwidth interval is 10M (5M at the upper and lower ends). By the method, the self-adaptive allocation of the uplink and downlink bandwidths is realized, and the utilization rate of frequency spectrum resources and the data transmission efficiency are further improved.
In an embodiment, the base station may send a second duplex mode switching instruction to the terminal, and after receiving the second duplex mode switching instruction, the terminal determines that the downlink frequency band and the uplink frequency band are configured to be symmetrical with respect to a center frequency of the predetermined frequency band, and performs data transmission in a conventional FDD mode. In an embodiment, the base station may further send a third duplex mode switching instruction to the terminal, and after receiving the third duplex mode switching instruction, the terminal performs uplink and downlink signal transmission in a time division duplex manner.
By the method, the base station can configure the terminal to adopt an FDD and/or TDD mode for data transmission, and the requirements of different networks, different terminals and different occasions are met.
In an embodiment, after the base station sends the first duplex mode switching instruction to the terminal, if the terminal cannot support a duplex mode in which the center frequencies of the downlink frequency band, and the predetermined frequency band are the same, a handover unsuccessful message may be fed back to the base station, or a handover successful message that should be sent when the handover is successful may not be sent. And if the base station confirms that the terminal can not support the duplex mode, the original mode is adopted or other modes are selected for transmission.
By the method, the support of the existing terminal equipment can be realized, and communication errors and information loss caused by the performance problem of the terminal can be prevented.
In an embodiment, the base station may adopt a selective scheduling method, and for different frequency bands, different duplex data transmission methods are adopted for data transmission, including a mode in which the center frequencies of the uplink and downlink frequency bands mentioned in the present application are respectively the same as the center frequencies of the predetermined frequency bands allocated to the user, and a conventional FDD or TDD mode, and the like, thereby realizing adaptive scheduling for each terminal in different frequency bands, improving flexibility and adaptability, and facilitating popularization and application.
A schematic diagram of one embodiment of a base station of the present application is shown in fig. 4. The downlink signal generation unit 401 can modulate downlink data in a downlink frequency band having the same center frequency as the center frequency of the predetermined frequency band allocated to the user, and generate a downlink signal. The uplink signal acquiring unit 402 can acquire an uplink signal in an uplink frequency band. The center frequency of the uplink band is the same as the center frequency of the predetermined band allocated to the user. The sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped. The uplink and downlink signals may be allocated spectrum resources in the manner shown in fig. 2A and 2B.
In the interaction process of the base station and the terminal, the central frequencies of the uplink and downlink frequency bands are respectively the same as the central frequencies of the preset frequency bands distributed to the users, so that the non-mutually symmetrical distribution of the uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently distributed to the asymmetrical services, and the utilization rate of the frequency spectrum resources is improved.
A schematic structural diagram of an embodiment of a base station of the present application may be shown in fig. 6. The base station includes a memory 610 and a processor 620. Wherein: the memory 610 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is for storing instructions for execution by the base station in the corresponding embodiments of the duplex data transmission method hereinabove. Processor 620 is coupled to memory 610 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 620 is configured to execute the instructions stored in the memory, and can implement asymmetric allocation of uplink and downlink signals, facilitate allocation of unequal spectrum resources for asymmetric services, and improve the utilization rate of spectrum resources.
In one embodiment, as also shown in fig. 7, the base station 700 includes a memory 710 and a processor 720. Processor 720 is coupled to memory 710 by BUS 730. The base station 700 may also be coupled to an external storage device 750 via a storage interface 740 for retrieving external data, and to a network or another computer system (not shown) via a network interface 760. And will not be described in detail herein.
In this embodiment, the memory stores the data instruction, and the processor processes the instruction, so that non-symmetric allocation of uplink and downlink signals can be realized, non-equivalent spectrum resources can be conveniently allocated to asymmetric services, and the utilization rate of the spectrum resources is improved.
Fig. 5 is a schematic diagram of an embodiment of a terminal of the present application. Uplink signal generating section 501 can modulate uplink data in an uplink band having the same center frequency as the center frequency of a predetermined band allocated to a user, and generate an uplink signal. The downlink signal acquisition unit 502 acquires a downlink signal in a downlink frequency band, where a center frequency of the downlink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user. The uplink and downlink signals may be allocated spectrum resources in the manner shown in fig. 2A and 2B.
In the interaction process of the terminal and the base station, the central frequencies of the uplink and downlink frequency bands are respectively the same as the central frequencies of the preset frequency bands allocated to the users, so that the non-symmetrical allocation of uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently allocated to the asymmetrical services, and the utilization rate of the frequency spectrum resources is improved.
A schematic structural diagram of an embodiment of the terminal of the present application may also be as shown in fig. 6. The terminal includes a memory 610 and a processor 620. Wherein: the memory 610 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is for storing instructions for execution by the terminal in the corresponding embodiments of the duplex data transmission method hereinabove. Processor 620 is coupled to memory 610 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 620 is configured to execute the instructions stored in the memory, and can implement asymmetric distribution of uplink and downlink signals, facilitate distribution of unequal spectrum resources for asymmetric services, and improve the utilization rate of the spectrum resources.
In one embodiment, as also shown in fig. 7, terminal 700 includes memory 710 and a processor 720. Processor 720 is coupled to memory 710 by BUS 730. The terminal 700 can also be connected to an external storage device 750 through a storage interface 740 for retrieving external data, and can also be connected to a network or another computer system (not shown) through a network interface 760. And will not be described in detail herein.
In this embodiment, the memory stores the data instruction, and the processor processes the instruction, so that non-symmetric allocation of uplink and downlink signals can be realized, non-equivalent spectrum resources can be conveniently allocated to asymmetric services, and the utilization rate of the spectrum resources is improved.
In another embodiment, a computer-readable storage medium is also proposed, on which computer program instructions are stored, which instructions, when executed by a processor, implement the steps of the method in the corresponding embodiment of the duplex data transmission method. As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Fig. 8 is a schematic diagram of an embodiment of a duplex data transmission system according to the present application. The base station 81 may be any one of the base stations mentioned above; terminals 821-82 n can be any of the above-mentioned terminals, and the data transmission between the terminals and the base station can allocate spectrum resources in the manner shown in fig. 2A and 2B.
In the duplex data transmission system, the central frequencies of the uplink and downlink frequency bands are respectively the same as the central frequency of the preset frequency band allocated to the user, so that the non-symmetrical allocation of the uplink and downlink signals is realized, the non-equivalent frequency spectrum resources can be conveniently allocated to the asymmetrical service, and the utilization rate of the frequency spectrum resources is improved.
In one embodiment, the MIB (Master Information Block) may notify the user to use the duplex data transmission method proposed in the present application, as follows:
wherein, the New-duplex ended { true } is a New added signaling as the first duplex mode switching instruction. The terminal recognizes the signaling and performs mode switching. The first duplex mode switching instruction comprises indication information of a preset frequency band, and the resource mapping identifier is calculated according to the whole bandwidth allocated to the terminal.
By the method, mode switching can be performed by short signaling, the terminal and the base station can communicate according to the preset uplink and downlink frequency band allocation strategy, the signaling consumption is low, and the burden of the base station and the communication network is reduced.
In another embodiment, notifying the user in the MIB that the duplex data transmission method proposed in the present application is adopted may be further as follows:
wherein the content of the first and second substances,
dl-bandwidth DL-bandwidth ENUMERATED{bw1,bw2,…}
ul-bandwidth UL-bandwidth ENUMERATED{bw1,bw2,…}
the new signaling is used as the first duplex mode switching command. The first duplex mode switching instruction includes uplink frequency band indication information and downlink frequency band indication information, and the resource needs to be converted according to the initial positions of the uplink frequency band and the downlink frequency band after receiving the notified resource identifier. As shown in fig. 9A:
assuming that 91 is an uplink frequency band, 92 is a downlink frequency band, and 93 is a guard frequency band, PRB N + M is calculated according to a PRB (Physical Resource Block) identifier PRB N (N is a non-negative integer) and the number M of PRBs occupied by the downlink frequency band 92 and the guard frequency band 93 (M is a non-negative integer).
By the method, the base station can send the uplink and downlink frequency band information to the terminal, so that the self-adaptive adjustment is facilitated, and the adaptability to actual requirements and the resource utilization rate are further improved.
Fig. 9B is a schematic diagram of another embodiment of frequency bands occupied by signaling in the duplex data transmission system according to the present application. Wherein, the vertical direction is the frequency domain direction, and the horizontal direction is the time domain direction. In the Uplink frequency band 92, a TDM (Time-Division Multiplexing) manner is adopted within a discontinuous bandwidth to perform SRS (Sounding Reference Signal), DMRS (Demodulation Reference Signal), and PUSCH (Physical Uplink Shared Channel) transmission, and a specific timing may be configured by a base station. From the perspective of optimizing the peak-to-average power ratio of the transmitted signal, UL data needs to be transmitted in continuous frequency resources, and the UL data can be uploaded in a TDM manner as shown by a dotted line in a discontinuous frequency band lower diagram.
The duplex data transmission system can fully utilize time domain resources on the basis of fully utilizing frequency domain resources, reduce time delay and achieve the purpose of rapid interaction of signaling and data between the terminal and the base station.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present application has been described in detail so far. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present application. Those skilled in the art can now fully appreciate how to implement the teachings disclosed herein, in view of the foregoing description.
The methods and apparatus of the present application may be implemented in a number of ways. For example, the methods and apparatus of the present application may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present application are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present application may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present application. Thus, the present application also covers a recording medium storing a program for executing the method according to the present application.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present application and not to limit it; although the present application has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the specific embodiments of the application or equivalent replacements of some of the technical features may still be made; all of which are intended to be encompassed within the scope of the claims appended hereto without departing from the spirit and scope of the present disclosure.
Claims (18)
1. A duplex data transmission method, comprising:
a base station modulates downlink data in a downlink frequency band to generate a downlink signal, wherein the central frequency of the downlink frequency band is the same as the central frequency of a preset frequency band allocated to a user;
the base station acquires an uplink signal in an uplink frequency band, wherein the central frequency of the uplink frequency band is the same as the central frequency of a preset frequency band allocated to a user;
and the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
2. The method of claim 1, wherein the uplink frequency band is located in a middle position of the predetermined frequency band, and the downlink frequency bands are located on two sides of the predetermined frequency band;
or the like, or, alternatively,
the downlink frequency band is located in the middle of the preset frequency band, and the uplink frequency band is located on two sides of the preset frequency band.
3. The method of claim 1, wherein the uplink signal and the downlink signal respectively occupy all time domain resources of respective frequency domains;
and/or the presence of a gas in the atmosphere,
and a protection bandwidth is arranged between the uplink frequency band and the downlink frequency band.
4. The method of claim 1, further comprising:
sending a first duplex mode switching instruction to a terminal so that the terminal determines that the configured downlink frequency band, the downlink frequency band and the center frequency of the preset frequency band are the same;
and/or the presence of a gas in the atmosphere,
sending a second duplex mode switching instruction to the terminal so that the terminal determines that the downlink frequency band and the uplink frequency band are configured to be symmetrical by taking the center frequency of the preset frequency band as a center;
and/or the presence of a gas in the atmosphere,
and sending a third duplex mode switching instruction to the terminal so that the terminal can determine to adopt a time division duplex mode to carry out uplink and downlink signal transmission.
5. The method according to claim 4, wherein the first duplex mode switching instruction includes a predetermined frequency band indication information;
and/or the presence of a gas in the gas,
the first duplex mode switching instruction comprises uplink frequency band bandwidth indication information and/or downlink frequency band bandwidth indication information.
6. The method according to claim 4, wherein the first duplex mode switching instruction includes uplink frequency band bandwidth indication information and/or downlink frequency band bandwidth indication information;
and the base station adjusts the uplink frequency band bandwidth and/or the downlink frequency band bandwidth in real time according to the uplink and downlink data load condition, and sends the uplink frequency band bandwidth and/or the downlink frequency band bandwidth to the terminal through the first duplex mode switching instruction.
7. A duplex data transmission method, comprising:
the terminal modulates uplink data in an uplink frequency band to generate an uplink signal, wherein the central frequency of the uplink frequency band is the same as the central frequency of a preset frequency band allocated to a user;
the terminal acquires a downlink signal in a downlink frequency band, wherein the center frequency of the downlink frequency band is the same as the center frequency of a preset frequency band allocated to a user;
and the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
8. The method of claim 7, wherein the uplink frequency band is located in the middle of the predetermined frequency band, and the downlink frequency bands are located on both sides of the predetermined frequency band;
or the like, or a combination thereof,
the downlink frequency band is located in the middle of the preset frequency band, and the uplink frequency band is located on two sides of the preset frequency band.
9. The method of claim 7, wherein the uplink signal and the downlink signal respectively occupy all time domain resources of respective frequency domains;
and/or the presence of a gas in the gas,
and a protection bandwidth is arranged between the uplink frequency band and the downlink frequency band.
10. The method of claim 7, further comprising:
determining that the central frequencies of a configured downlink frequency band, the downlink frequency band and the preset frequency band are the same according to a first duplex mode switching instruction from a base station;
and/or the presence of a gas in the gas,
determining to configure the downlink frequency band and the uplink frequency band to be symmetrical by taking the center frequency of the preset frequency band as a center according to a second duplex mode switching instruction from the base station;
and/or the presence of a gas in the gas,
and determining to adopt a time division duplex mode to carry out uplink and downlink signal transmission according to a third duplex mode switching instruction from the base station.
11. The method according to claim 10, wherein the first duplex mode switching instruction includes a predetermined frequency band indication information, and a predetermined frequency band is determined according to the predetermined frequency band indication information;
and/or the presence of a gas in the gas,
the first duplex mode switching instruction comprises uplink frequency band bandwidth indication information and/or downlink frequency band bandwidth indication information, and the uplink frequency band and the downlink frequency band are calculated according to the uplink frequency band bandwidth indication information and/or the downlink frequency band bandwidth indication information.
12. The method of claim 7, further comprising:
and the terminal transmits information of a channel Sounding Reference Signal (SRS), a demodulation reference signal (DMRS) and a Physical Uplink Shared Channel (PUSCH) in a discontinuous bandwidth in a time division multiplexing mode.
13. A base station, comprising:
a downlink signal generating unit, configured to modulate downlink data in a downlink frequency band, and generate a downlink signal, where a center frequency of the downlink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user;
an uplink signal acquiring unit, configured to acquire an uplink signal in an uplink frequency band, where a center frequency of the uplink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user;
and the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
14. A base station comprising
A memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-6 based on instructions stored in the memory.
15. A terminal, comprising:
an uplink signal generating unit, configured to modulate uplink data in an uplink frequency band, and generate an uplink signal, where a center frequency of the uplink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user;
a downlink signal acquiring unit, configured to acquire a downlink signal in a downlink frequency band, where a center frequency of the downlink frequency band is the same as a center frequency of a predetermined frequency band allocated to a user;
and the sum of the uplink frequency band and the downlink frequency band is less than or equal to the preset frequency band, and the uplink frequency band and the downlink frequency band are not overlapped.
16. A terminal, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 7-12 based on instructions stored in the memory.
17. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any one of claims 1 to 12.
18. A duplex data transmission system comprising: the base station of claim 13 or 14; and, a terminal as claimed in claim 15 or 16.
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| CN201710875180.1A CN109561501B (en) | 2017-09-25 | 2017-09-25 | Duplex data transmission method, base station and terminal |
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| CN201710875180.1A CN109561501B (en) | 2017-09-25 | 2017-09-25 | Duplex data transmission method, base station and terminal |
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| CN109561501B true CN109561501B (en) | 2022-08-30 |
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| GB2457011B (en) * | 2008-01-18 | 2010-09-29 | Toshiba Res Europ Ltd | Wireless communications apparatus |
| US20110014938A1 (en) * | 2008-03-06 | 2011-01-20 | Runcom Technologies Ltd. | Asymmetric bands allocation in downlink and uplink using the same fft size |
| US20110164698A1 (en) * | 2009-01-21 | 2011-07-07 | Wu Jane Zhen | Systems and methods with non symmetric OFDM modulation |
| CN102905270B (en) * | 2012-10-24 | 2015-03-18 | 中国联合网络通信集团有限公司 | Communication method and device for frequency division duplexing (FDD) system and base station |
| CN104284432A (en) * | 2014-09-29 | 2015-01-14 | 中国联合网络通信集团有限公司 | Method and device for utilizing asymmetrical frequency band resource |
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