CN106162656A - Method, base station, terminal and the communication system of data transmission - Google Patents

Method, base station, terminal and the communication system of data transmission Download PDF

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Publication number
CN106162656A
CN106162656A CN201510145917.5A CN201510145917A CN106162656A CN 106162656 A CN106162656 A CN 106162656A CN 201510145917 A CN201510145917 A CN 201510145917A CN 106162656 A CN106162656 A CN 106162656A
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spectrum
terminal
downlink
full duplex
transmission
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CN106162656B (en
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许森
卞宏梁
孙震强
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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Abstract

The invention discloses method, base station, terminal and the mobile communication system of a kind of data transmission, wherein method includes: the uplink spectrum in paired spectrum is configured to full duplex frequency spectrum by base station；When according to the timing relationship of HARQ, base station determines that terminal need not send data or feedback information in the subframe of up-link wireless frame, then by resource distribution corresponding in subframe for this terminal for carrying out downlink transfer in full duplex frequency spectrum, and on full duplex frequency spectrum or downstream spectrum, send the resource scheduling information of subframe downstream transmission.Method, base station, terminal and the mobile communication system of the data transmission of the present invention, allocation of downlink can transmit in uplink spectrum, use the frequency resource of network more neatly, improve the efficiency of frequency, the frequency resource that can use operator obtains significantly more efficient utilization, realize simple and access delay is little, and the terminal for different editions has good compatibility, it is achieved the handling capacity of whole system and the lifting of terminal experience.

Description

Data transmission method, base station, terminal and communication system
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a data transmission method, a base station, a terminal, and a communication system.
Background
The mobile communication technology is developed very rapidly, the Division of Frequency spectrum in the future 5G technology still exists in a paired and unpaired mode, and the requirement of uplink and downlink rates in internet service presents an extremely asymmetric situation, so that the adoption of paired Frequency spectrum according to the traditional FDD (Frequency Division Duplexing) mode can cause serious waste of resources of an uplink Frequency band. To solve this problem, the concept of flex duplexing was proposed in the 5G study[1]And a part of uplink subframes are changed into downlink subframes, so that the effective utilization of resources is realized. But the pure flexibility also has the defects:
1. compatibility issues: for some terminals that do not support flexible duplex, after uplink and downlink direction transmission is supported in an uplink carrier, data transmission and reception cannot be performed according to the existing protocol, thereby affecting normal access of old versions of terminals.
2. The downlink transmission RTT increases: for a conventional LTE FDD system, there is a fixed correspondence between uplink and downlink. If the flexible duplex is adopted, the fixed relation is broken, so that the Time of downlink Transmission RTT (Radio Transmission Time) is prolonged, and the frequency spectrum efficiency and the Transmission delay are reduced.
As shown in fig. 1, a comparison is given about downlink RTT of the flexible duplex and the conventional carrier configuration, from which it can be found that since an uplink subframe 4 becomes a downlink subframe, feedback of a terminal cannot be performed in the subframe 4, and therefore feedback is performed only in the subframe 5, such an operation causes the RTT transmission time to be longer, and transmission delay is increased.
The resource flexibility is still limited: from the system level, once configured for downlink transmission, the subframe in the flexible duplex cannot be changed in the update period, so that even if the traffic proportional relationship changes in this period, the resource configuration cannot be adjusted. From the perspective of a single terminal, if a flexible downlink subframe is not scheduled, the subframe cannot be used to transmit uplink data or feedback information. As shown in fig. 2, a schematic diagram of resource limitation in the flexible duplex is given, and it can be seen from this that, for the flexible duplex terminal, if it is not scheduled by the network side on the subframe 7, the subframe 7 cannot transmit uplink data or feedback information either. Therefore, in order to more flexibly use the resources of the uplink frequency band in the paired spectrum in the future 5G, the above problem needs to be solved to further improve the user experience and the utilization rate of the radio resources.
As another candidate technology of 5G, the "full duplex technology" is mainly used to implement simultaneous transceiving at a transmission node. However, the full-duplex technology has certain defects in the networking process, which causes the standardization and the test to progress slowly: in a networking scenario, for a system which originally passes through a time/frequency duplex isolation receiving/transmitting node, all nodes which use same-frequency simultaneous resources but do not communicate with each other will interfere with receiving by transmitting between each other, so that a huge obstacle exists in the application of full duplex to a cellular network.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for data transmission, in which a base station can allocate downlink transmission in an uplink spectrum.
Under a paired spectrum transmission mode, a base station configures an uplink spectrum in a paired spectrum as a full duplex spectrum; the base station sends the configuration information of the full duplex spectrum to a terminal; when the base station determines that the terminal does not need to send data or feedback information in a subframe of an uplink wireless frame according to the timing relation of the HARQ, configuring the resource corresponding to the terminal in the subframe to carry out downlink transmission in the full duplex spectrum, and sending the resource scheduling information of the uplink and downlink transmission of the subframe on the full duplex spectrum or the downlink spectrum.
According to an embodiment of the present invention, further, the multiple access mode of downlink transmission in the full duplex spectrum adopts OFDMA, and the multiple access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA; and the downlink frequency spectrum in the paired frequency spectrums is used for downlink transmission, and the adopted multiple access mode is OFDMA.
According to an embodiment of the present invention, further, the sending, by the base station, configuration information of a full duplex spectrum to the terminal includes: the base station judges whether the terminal supports downlink transmission in a full duplex frequency spectrum, if so, the base station sends configuration information of the full duplex frequency spectrum to the terminal, and if not, the base station transmits data according to an FDD-LTE mode.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum includes: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum further includes: the size of the area is controlled.
According to an embodiment of the present invention, further, the subframe for downlink transmission in the full duplex frequency band includes: a control region and a data transmission region; the control region is used for carrying two channels, namely a PDCCH and a PCFICH, the PDCCH is used for carrying resource allocation information of the terminal, and the PCFICH is used for indicating the size of the control region; the data area is used for carrying user-specific data.
According to an embodiment of the present invention, further, the subframe for downlink transmission in the full duplex frequency band further includes: a guard interval region; the protection interval region is used for the same terminal to receive the downlink data and carry out the conversion protection between the uplink data transmission; wherein the base station does not transmit any signal in a guard interval region of the downlink transmission subframe.
According to an embodiment of the present invention, further, the guard interval region is configured independently for each terminal; when downlink transmission is performed on the terminal in the N subframes in the full duplex spectrum, if it is determined that the terminal needs to perform uplink data transmission or feedback information in the N +1 subframe in the full duplex spectrum according to the timing relationship of the HARQ, the guard interval region is opened for the downlink transmission of the terminal in the N subframes, otherwise the guard interval region is not opened.
Further, according to an embodiment of the present invention, if the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrum, the base station follows the formulaResource mapping is carried out in downlink frequency spectrum, otherwise, the base station carries out resource mapping according to a formulaPerforming resource mapping in the full-duplex spectrum; wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCIIndicating the downlink carrier number, n, of a full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
According to an embodiment of the present invention, further, the timing relationship of the uplink HARQ is specifically: the terminal transmits uplink in N subframes in the full duplex spectrum; the base station sends ACK or NACK through a PHICH channel in an N +4 subframe in the downlink frequency spectrum to indicate whether data is correctly received; if NACK information is fed back, the base station indicates retransmission configuration information in a PDCCH channel in the N +4 subframe, including: redundancy version, time-frequency resource position information for scheduling uplink transmission, MCS for uplink transmission and uplink MIMO.
According to an embodiment of the present invention, further, the timing relationship of the downlink HARQ is specifically: the base station sends downlink transmission in N subframes in the full duplex spectrum and/or carries out downlink transmission in the N subframes in the downlink spectrum; the terminal sends ACK or NACK in the N +4 subframe in the full duplex spectrum to indicate whether the data is received correctly; and if NACK information is fed back, the terminal monitors a control channel in the N +8 subframe to acquire retransmission information.
According to an embodiment of the present invention, further, if the base station determines the amount of buffered data in the MAC layer entity corresponding to the terminalSubtracting the amount of data that the terminal can transmit on the downlink spectrum within a time windowIs greater than a preset threshold value TCAThe base station allocates downlink transmission in the full duplex spectrum for the terminal in the time window; wherein the size of the time window and the T are configured through a network management systemCAThe above-mentionedAnd said
According to an embodiment of the present invention, further, the method further includes: a base station receives the supporting capability information reported by a terminal through a signaling; wherein the support capability information includes: indication whether downlink data transmission in a full-duplex frequency band is supported, and frequency point information of supported full-duplex downlink transmission.
The technical problem to be solved by the present invention is to provide a data transmission method, in which a terminal can receive downlink data carried in an uplink spectrum.
The terminal receives configuration information of a full duplex spectrum from a base station, wherein the base station configures an uplink spectrum in a paired spectrum into the full duplex spectrum; when the terminal determines that data or feedback information does not need to be sent in a subframe of an uplink wireless frame according to the HARQ timing relationship, monitoring a full duplex frequency spectrum or a downlink frequency spectrum, and acquiring resource scheduling information for downlink transmission in the full duplex frequency spectrum; and the terminal acquires downlink data from a subframe of an uplink radio frame according to the resource scheduling information.
According to an embodiment of the present invention, further, the multiple access mode of downlink transmission in the full duplex spectrum adopts OFDMA, and the multiple access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA; the downlink frequency spectrum in the paired frequency spectrums is specially used for downlink transmission, and the adopted multiple access mode is OFDMA.
According to an embodiment of the present invention, further, if the terminal supports downlink transmission in the full duplex frequency band, the terminal sends the support capability information to the network side through a signaling; wherein the support capability information includes: whether downlink data transmission in a full-duplex frequency band is supported or not, and a list of frequency point information of supported full-duplex downlink transmission.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum includes: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum further includes a control region size.
Further, according to an embodiment of the present invention, if the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrum, the terminal schedules the full duplex spectrum downlink transmission according to the formulaAcquiring the resource allocation information in the downlink frequency spectrum, otherwise, the terminal acquires the resource allocation information according to a formulaAcquiring resource allocation information in a full duplex spectrum; wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCICarrier number, n, indicating full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
One technical problem to be solved by the present invention is to provide a base station capable of allocating downlink transmission in an uplink spectrum.
The base station comprises a resource allocation unit, a resource allocation unit and a resource allocation unit, wherein the resource allocation unit is used for configuring an uplink spectrum in a paired spectrum into a full-duplex spectrum in a transmission mode of the paired spectrum; a configuration information sending unit, which sends the configuration information of the full duplex spectrum to the terminal; and the data transmission unit is used for configuring the corresponding resources of the terminal in the subframe to perform downlink transmission in the full-duplex spectrum and transmitting the resource scheduling information of the uplink and downlink transmission of the subframe on the full-duplex spectrum or the downlink spectrum when the terminal does not need to transmit data or feedback information in the subframe of the uplink wireless frame according to the timing relation of the HARQ.
According to an embodiment of the present invention, further, the multiple access mode of downlink transmission in the full duplex spectrum adopts OFDMA, and the multiple access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA; the downlink frequency spectrum in the paired frequency spectrums is specially used for downlink transmission, and the adopted multiple access mode is OFDMA.
According to an embodiment of the present invention, the configuration information sending unit is further configured to determine whether the terminal supports downlink transmission in a full duplex spectrum, and if so, send the configuration information of the full duplex spectrum to the terminal; and if the terminal does not support downlink transmission in the full duplex spectrum, performing data transmission according to the FDD-LTE mode.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum includes: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum further includes: the size of the area is controlled.
According to an embodiment of the present invention, further, the subframe for downlink transmission in the full duplex frequency band includes: a control region and a data transmission region; the control region is used for carrying two channels, namely a PDCCH and a PCFICH, the PDCCH is used for carrying resource allocation information of the terminal, and the PCFICH is used for indicating the size of the control region; the data area is used for carrying user-specific data.
According to an embodiment of the present invention, further, the subframe for downlink transmission in the full duplex frequency band further includes: a guard interval region; the protection interval region is used for the same terminal to receive the downlink data and carry out the conversion protection between the uplink data transmission; wherein the data transmission unit does not transmit any signal in a guard interval region of the downlink transmission subframe.
According to an embodiment of the present invention, further, the guard interval region is configured independently for each terminal; when downlink transmission is performed on the terminal in the N subframes in the full duplex spectrum, if it is determined that the terminal needs to perform uplink data transmission or feedback information in the N +1 subframe according to the timing relationship of the HARQ, the data transmission unit starts the guard interval region for the downlink transmission of the terminal in the N subframes, otherwise the guard interval region is not started.
According to an embodiment of the present invention, further, the resource allocation unit is further configured to, if the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrum, according to a formulaResource mapping is carried out in the downlink frequency spectrum, otherwise, according to a formulaPerforming resource mapping in the full-duplex spectrum; wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCIIndicating the downlink carrier number, n, of a full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
According to an embodiment of the present invention, further, the timing relationship of the uplink HARQ is specifically: the terminal transmits uplink in N subframes in the full duplex spectrum; the data transmission unit sends ACK or NACK through a PHICH in an N +4 subframe in the downlink frequency spectrum to indicate whether data is correctly received; if NACK information is fed back, the data transmission unit indicates retransmission configuration information in a PDCCH channel in the N +4 subframe, including: redundancy version, time-frequency resource position information for scheduling uplink transmission, MCS for uplink transmission and uplink MIMO.
According to an embodiment of the present invention, further, the timing relationship of the downlink HARQ is specifically: the data transmission unit sends downlink transmission in N subframes in the full duplex spectrum and/or carries out downlink transmission in the downlink spectrum; the terminal sends ACK or NACK in the N +4 subframe in the full duplex spectrum to indicate whether the data is received correctly; and if NACK information is fed back, the terminal monitors a control channel in the N +8 subframe to acquire retransmission information.
One technical problem to be solved by the present invention is to provide a terminal capable of receiving downlink transmission in an uplink spectrum.
The terminal comprises a configuration information receiving unit, a configuration information transmitting unit and a configuration information receiving unit, wherein the configuration information receiving unit is used for receiving configuration information of a full-duplex spectrum from a base station, and an uplink spectrum in a paired spectrum is configured to be the full-duplex spectrum by the base station; a monitoring unit, configured to monitor a full duplex spectrum or a downlink spectrum and acquire resource scheduling information for performing downlink transmission in the full duplex spectrum when it is determined that data or feedback information does not need to be sent in a subframe of an uplink radio frame according to the HARQ timing relationship; and the data transceiving unit is used for acquiring downlink data from a subframe of an uplink radio frame according to the resource scheduling information.
According to an embodiment of the present invention, further, the multiple access mode of downlink transmission in the full duplex spectrum adopts OFDMA, and the multiple access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA; the downlink frequency spectrum in the paired frequency spectrums is specially used for downlink transmission, and the adopted multiple access mode is OFDMA.
According to an embodiment of the present invention, further, the supporting information sending unit is configured to send the supporting capability information to the network side through a signaling if the terminal supports downlink transmission in a full duplex frequency band; wherein the support capability information includes: whether downlink data transmission in a full-duplex frequency band is supported or not, and a list of frequency point information of supported full-duplex downlink transmission.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum includes: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
According to an embodiment of the present invention, further, the configuration information of the full duplex spectrum further includes a control region size.
According to an embodiment of the present invention, further, the monitoring unit is further configured to, if the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrum, schedule the full duplex spectrum downlink transmission according to a formulaObtaining resource distribution information in downlink frequency spectrum, otherwise, according to formulaAcquiring resource allocation information in a full duplex spectrum; wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCICarrier number, n, indicating full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
The invention provides a communication system, which comprises the base station and the terminal.
The data transmission method, the base station, the terminal and the communication system can configure the uplink frequency spectrum of the paired frequency spectrum into the full-duplex frequency spectrum, and allocate downlink transmission in the uplink frequency spectrum, thereby improving the frequency efficiency and having good compatibility for terminals of different versions.
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 schematic diagram illustrating a variation of a downstream RTT after flexible duplexing according to the prior art;
fig. 2 is a schematic diagram illustrating the effect of flexible duplexing on the resource utilization of a terminal in the prior art;
FIG. 3 is a flow diagram for one embodiment of a method of data transmission in accordance with the present invention;
fig. 4 is a schematic diagram of a frame structure of a downlink subframe in a full-duplex spectrum;
fig. 5 is a process flow diagram of the base station side of one embodiment of a method of data transmission according to the present invention;
FIG. 6 is a schematic diagram of frequency band usage in a macro-micro network;
FIG. 7 is a timing diagram of an embodiment;
FIG. 8 is a schematic timing diagram of another embodiment;
fig. 9 is a block diagram of an embodiment of a base station according to the present invention;
fig. 10 is a block diagram of an embodiment of a terminal according to the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. 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. The technical solution of the present invention is described in various aspects below with reference to various figures and embodiments.
Fig. 3 is a flowchart of an embodiment of a method of data transmission according to the present invention, as shown in fig. 3:
step 101, under the transmission mode of the paired spectrum, the base station configures the uplink spectrum in the paired spectrum as a full duplex spectrum.
Step 102, the base station sends the configuration information of the full duplex spectrum to the terminal.
103, when the base station determines that the terminal does not need to send data or feedback information in the subframe of the uplink radio frame according to the timing relationship of the HARQ, configuring the resource corresponding to the terminal in the subframe to perform downlink transmission in the full duplex spectrum.
And 104, sending the resource scheduling information of uplink and downlink transmission of the subframe on the full duplex spectrum or the downlink spectrum.
The LTE system defines radio frames for signal transmission, and the length of 1 radio frame is 10 ms. In the FDD frame structure, a radio frame of length 10ms is composed of 10 subframes of length 1ms, each of which is composed of two slots of length 0.5 ms. The uplink radio frame is a radio frame for transmitting data in an uplink spectrum.
The data transmission method of the above embodiment can flexibly allocate downlink resources in the paired spectrum. The uplink spectrum of the base station side in the paired spectrum is configured as full duplex, and is a full duplex spectrum, wherein the downlink transmission adopts an OFDMA (Orthogonal Frequency Division Multiple Access) mode, and the uplink adopts SC-FDMA (Single-Carrier Frequency-Division Multiple Access). Or Nx SC-FMDA. And the downlink frequency spectrum in the paired frequency spectrums is used for downlink transmission, and the adopted multiple access mode is OFDMA.
The base station determines whether the terminal can support downlink transmission in the full duplex spectrum according to the capability of the terminal, and if the terminal supports the downlink transmission in the full duplex spectrum, the base station configures the configuration information for downlink transmission in the full duplex spectrum to the terminal through a high-level signaling. And the base station judges whether the terminal supports downlink transmission in the full duplex spectrum, if so, the base station sends configuration information of the full duplex spectrum to the terminal, and if not, the base station transmits data according to an FDD-LTE mode.
The base station side determines whether to start downlink transmission in the full-duplex spectrum according to the overall downlink load of the network, and determines whether the time is terminal scheduling and a corresponding transmission mode according to the buffer status in the terminal MAC layer and whether uplink feedback or transmission exists at a certain time and a subsequent adjacent time under the condition that the downlink transmission in the full-duplex spectrum needs to be started.
The terminal receives configuration information of a full duplex spectrum from a base station. And when the terminal determines that the subframe of the uplink wireless frame does not need to send data or feedback information according to the HARQ timing relationship, monitoring the full duplex spectrum or the downlink spectrum, and acquiring resource scheduling information for downlink transmission in the full duplex spectrum. And the terminal acquires downlink data from the subframe of the uplink radio frame according to the resource scheduling information.
In one embodiment, there are two timing relationships for HARQ, namely uplink and downlink. The timing relationship of the uplink HARQ is specifically: the terminal transmits uplink in N subframes in the full duplex spectrum. And the base station sends ACK or NACK through a PHICH channel in an N +4 subframe in a downlink frequency spectrum to indicate whether the data is correctly received. If NACK information is fed back, the base station indicates retransmission configuration information in a PDCCH channel in an N +4 subframe, including: redundancy version, time-frequency resource position information for scheduling uplink transmission, MCS for uplink transmission and uplink MIMO.
The timing relationship of the downlink HARQ is specifically: the base station sends downlink transmission in N subframes in a full duplex spectrum and/or carries out downlink transmission in the N subframes in the downlink spectrum. The terminal sends an ACK or NACK in the N +4 subframes in the full duplex spectrum, indicating whether the data was received correctly. And if NACK information is fed back, the terminal monitors a control channel in the N +8 subframe to acquire retransmission information.
As shown in fig. 4, the subframe structure for downlink transmission of the full duplex spectrum includes three parts: a control region, a data transmission region, and a guard interval configured independently for each terminal. The common pilot CRS is not configured in a subframe of downlink transmission of a full-duplex spectrum, and only a channel state information reference signal CSI-RS and a demodulation reference signal DMRS aiming at each user are configured. The three parts are defined as:
the Control region includes two channels, namely, a PDCCH (Physical Downlink Control Channel) and a PCFICH (Physical Control Format indicator Channel), the PCFICH is used for indicating the size of the Control region, and the PDCCH does not carry common Control information.
The data area is used for transmitting user-specific data and is not used for transmitting common information (e.g., broadcast messages) and higher layer signaling of the terminal. The data region is used for transmitting data, does not include signaling of L1/2/3, etc., is not used for transmitting higher layer signaling, and broadcasts resources.
The protection interval is mainly used for conversion protection between downlink data transmission and uplink data reception, the size of the protection interval is related to the coverage radius of a cell, and the value is configured to a terminal through high-level signaling. The guard interval is configured independently for each terminal. And if the terminal carries out uplink transmission at the subsequent moment of the moment N, starting the guard interval, and if the terminal receives downlink transmission at the subsequent moment of the moment N, not starting the guard interval.
If the terminal has no uplink data transmission (does not include SRS) or feedback information on the next subframe, the terminal does not start a guard interval during downlink transmission at the moment, the guard interval can be used for transmitting user data, otherwise, the guard interval is started, and the guard interval does not transmit any information.
When downlink transmission is carried out on a terminal in N subframes in a full duplex spectrum, if the fact that the terminal needs to carry out uplink data transmission or feedback information in N +1 subframes in the full duplex spectrum is determined according to the timing relation of HARQ, a guard interval area is opened for the downlink transmission of the terminal in the N subframes, otherwise, the guard interval area is not opened
And when the terminal supports downlink transmission in the full-duplex spectrum, transmitting configuration information of the full-duplex spectrum to the terminal. The configuration information includes one or more of the following, but is not limited to: whether to schedule full duplex spectrum downlink transmission through a downlink spectrum, the carrier number of a full duplex band, the size of a guard interval, and the size of a control region.
Fig. 5 is a processing flow diagram of the base station side according to an embodiment of the method for data transmission of the present invention, as shown in fig. 5:
and step 201, acquiring the capability of the terminal.
Step 202: after the base station side acquires the capability of the terminal, if the terminal is found not to support downlink transmission in the full duplex frequency band, the method proceeds to step 211, and processes according to the current LTE FDD terminal mode, otherwise, the method proceeds to step 203, and configures "configuration information of a full duplex frequency spectrum" for the terminal by using a high-level signaling, including but not limited to the following contents:
1. and (4) whether the full duplex spectrum downlink transmission is scheduled through the downlink spectrum, the size of the bit is 1.
And if the downlink interference on the full-duplex frequency band is serious, the downlink transmission of the full-duplex frequency band is scheduled through the downlink frequency band, and the selection is set to be 1, otherwise, the selection is set to be 0.
2. Carrier number of full duplex band: 3 bits, if 'downlink transmission through downlink spectrum scheduling full duplex spectrum' is set to 1, the carrier number is valid, otherwise the option is null.
3. Size of guard interval: 2 bits, where 00 is reserved temporarily, 01 denotes 1 OFDM symbol, 10 denotes 2 OFDM symbols, and 11 denotes 3 OFDM symbols.
4. Control area size: 2 bits, where 00 is reserved temporarily, 01 denotes 1 OFDM symbol, 10 denotes 2 OFDM symbols, and 11 denotes 3 OFDM symbols.
Step 204: if the total data volume to be transmitted of the downlink MAC layer in a time window exceeds the total data volume which can be transmitted in the downlink frequency band in the time window, the base station considers that downlink transmission is allocated to part or all of the terminals on the full-duplex frequency band, and the judgment principle of the terminal which needs to allocate downlink transmission on the full-duplex frequency band is as follows: if the current MAC (media Access Control) layer of the terminal buffers the data volumeSubtracting the amount of data that the terminal can transmit on the downlink spectrum within a time windowThe amount of data remaining thereafter still exceeds the threshold TCAThen consider the downlink transmission allocated to it on the full duplex band within this time window.
Step 205: for a terminal that needs to allocate downlink transmission in the full-duplex spectrum, if, at a certain time N, the terminal does not need to utilize PUCCH (Physical Uplink control channel) feedback according to the HARQ (Hybrid Automatic Repeat Request) timing relationship or does not schedule PUSCH Uplink transmission for the terminal at the time, step 206 is entered, and the full-duplex band at the time N can allocate downlink transmission.
In one embodiment, a HARQ timing sequence of a base station and a terminal in a downlink direction is designed, the base station transmits data on an nth subframe, and the terminal feeds back ACK/NACK information on an n +4 th subframe. For a certain downlink HARQ process: if downlink transmission is sent in the full-duplex spectrum at the time N, the terminal needs to send ACK/NACK in the full-duplex spectrum at the time N +4, so as to indicate whether the base station correctly receives data. If NACK information is fed back, the terminal monitors a control channel in a corresponding frequency spectrum at the moment of needing N +8 so as to determine retransmission information.
Step 207: if the terminal is configured with 'dispatching full duplex spectrum downlink transmission through downlink spectrum', the method is as followsAnd setting a searching position of scheduling resources in a full duplex spectrum in a control region in a downlink spectrum.
WhereinIs the location of the search space, L represents the aggregation level, YkIs defined as follows, i is 0, …, L-1, and M is 0, …, M(L)-1, and M ═ 0, …, M(L)-1，M(L)Is the number of PDCCHs, N, that need to be detected in a given search spaceCCE,kDenotes the total number of CCEs in the control region of subframe k, nCIA virtual carrier number representing the full duplex spectrum.
The set of PDCCH candidates to be detected is defined according to a search space, wherein the search space is of a certain aggregation size LIs given by a set of PDCCH candidates, in the search spaceThe ccis of PDCCH candidate channel m in (a) is given by the following formula:wherein Y iskIs defined as follows, i is 0, …, L-1, and M is 0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space.
If the terminal is not configured with 'dispatching full duplex spectrum downlink transmission through downlink spectrum', the terminal is in the full duplex spectrumIn the control region of the spectrum according toAnd setting the searching position of the scheduling resource.
Step 208: if the terminal does not schedule uplink PUSCH transmission (except for only SRS transmission) or transmit feedback information on the PUCCH at the next time N +1, step 210 is performed, and the time-frequency resource of the guard interval may be used in the resource allocation process at time N, otherwise step 209 is performed, and the time-frequency resource on the guard interval is not used.
In one embodiment, the implementation scheme of the terminal side comprises the following steps:
step 301: if the terminal supports downlink data reception in the full-duplex frequency band, the terminal indicates the support capability to the network through a high-level signaling when accessing the network, and the supported information includes but is not limited to the following:
1. whether downlink data transmission in the full duplex band is supported, 1 bit.
2. And a list of supported frequency point information for full-duplex downlink transmission.
Step 302: and the terminal acquires the related configuration of the full-duplex frequency band uplink transmission according to the system broadcast message.
Step 303: the terminal obtains downlink-transmitted 'configuration information of the full-duplex spectrum' and uplink transmission and feedback information in the full-duplex spectrum from a high-level signaling of the base station.
Step 304: at time N, if the terminal does not schedule uplink PUSCH transmission or feedback information on the PUCCH, the terminal needs to monitor the full-duplex spectrum or the control region of the downlink spectrum to know whether the base station schedules downlink transmission of the user on the full-duplex spectrum.
The method for judging whether monitoring the full duplex spectrum or the downlink spectrum control area is as follows: according to the configuration information of the base station in the full duplex frequency spectrumIf the downlink transmission of the full duplex spectrum is scheduled through the downlink spectrum, the control region of the downlink spectrum is monitored and the position of the control information in the search space is according to a formulaCalculating, otherwise monitoring the control region of the full duplex spectrum and controlling the position of the information in the search space according to the formulaThe process is carried out.
At time N, if the terminal is scheduled with uplink PUSCH transmission or feedback information on the PUCCH, the terminal considers that the base station side does not allocate downlink resources to the terminal on the full-duplex frequency band, and does not monitor the control region of the full-duplex spectrum.
Step 305: and transmitting at the time N +1, wherein the terminal does not have scheduled uplink PUSCH transmission or feedback information on the PUCCH, and is scheduled downlink transmission on the full-duplex frequency band at the time N, the terminal allocates downlink resources on the full-duplex frequency spectrum to include time-frequency resources of the guard interval part, otherwise, the terminal does not include the time-frequency resources of the guard interval part.
In one embodiment, a macro-micro networking topology is presented, as shown in FIG. 6. The macro station and the micro station adopt ideal transmission and share BBU, and the macro station configures normal LTE FDD carrier waves. And the uplink frequency band in the micro station is configured to be a full duplex frequency band. The macro base station can obtain the information of the downlink data sent by the micro station in the uplink frequency band due to the fact that the macro base station shares the BBU, and therefore the downlink interference of the micro station on the macro station side is eliminated.
In this embodiment, the PCI (Physical Cell ID: Physical Cell identifier) of the macro station is PCI1, and the PCI of the micro station is PCI 2. A terminal is a terminal that supports downlink transmission in a full duplex spectrum. Wherein, at transmission time 5, there is no uplink scheduled transmission and HARQ feedback by the base station for the terminal, as shown in fig. 7, and there is no uplink transmission and feedback at time 6. The following describes the processing from the base station side.
Step 401: since the micro station configures full duplex in the uplink frequency band, the broadcast message SIB1 publishes the downlink transmission power value in the uplink frequency band.
Step 402: after receiving the capability of the UE, the MME supports the relevant capability of the terminal to the base station through the S1 message, and the base station stores the capability information and encapsulates it in the context of the UE.
Step 403: the base station indicates the configuration information about the full duplex frequency band to the terminal through the RRC message, and the configuration information comprises the following contents:
1. and whether the full duplex spectrum downlink transmission is scheduled through the downlink spectrum or not is set to be 0.
2. Size of guard interval: set to 10.
3. Control area size: set to 11.
Step 404: the base station side discovers the data caching quantity of the MAC layer of the base station in 10msSubtracting the amount of data that the terminal can transmit on the downlink spectrum within a time windowThe amount of data remaining thereafter still exceeds the threshold TCAThen consider that downlink transmission in the full duplex spectrum is turned on in this radio frame.
Step 405: if the MAC layer buffer of the terminal in the radio frame also exceeds the preset threshold, the terminal is considered to be allocated with downlink transmission in the uplink frequency band at a suitable time in the radio frame.
Step 406: in subframe 5, since there is no uplink transmission and no feedback from the terminal, it is considered that downlink transmission is configured for the terminal on the uplink frequency band.
Step 407: because the base station does not configure the terminal with 'full duplex spectrum downlink transmission by downlink spectrum scheduling', the downlink control information is carried by the uplink frequency band. The position of the control information in the uplink frequency band control region is according to the formulaAnd (6) performing calculation. Since the terminal also has no uplink transmission on subframe 6, it occupies 2 OFDM symbols of the guard interval when allocating resources.
Step 408: the base station side sends down the resource allocation information of the uplink frequency band in the PDCCH of the uplink frequency band of the time slot 8, and transmits downlink resource data in the data transmission part of the uplink frequency band.
In one embodiment, as shown in fig. 6, the macro station and the micro station use ideal transmission and share BBU, the macro station configures a normal LTE FDD carrier, and the uplink frequency band in the micro station is configured as a full duplex frequency band. The macro base station can obtain the information of the downlink data sent by the micro station in the uplink frequency band due to the fact that the macro base station shares the BBU, and therefore the downlink interference of the micro station on the macro station side is eliminated. A terminal is a terminal that supports downlink transmission in a full duplex spectrum. In transmission time 5, there is no uplink scheduling transmission and HARQ feedback by the base station for the terminal, as shown in fig. 7. And there is also no uplink transmission and feedback at time 6. The following mainly describes the processing procedure from the terminal side.
Step 501: and the terminal acquires the downlink transmission power value in the uplink frequency band of the micro station by reading the value of the micro station broadcast message SIB 1.
Step 502: after the terminal initially accesses to the network, the capability of supporting downlink transmission on the full-duplex spectrum and the related frequency band number are encapsulated in the NAS message and indicated to the core network.
Step 503: the terminal carefully obtains the configuration information of the full duplex frequency band through the RRC of the base station, and the configuration information comprises the following contents:
1. and whether the full duplex spectrum downlink transmission is scheduled through the downlink spectrum or not is set to be 1.
2. Size of guard interval: set to 10.
3. Control area size: set to 11.
Step 504: in subframe 5, since there is no uplink transmission and feedback of the terminal, and the base station configures "downlink transmission of full duplex spectrum by downlink spectrum scheduling" for the terminal, the terminal needs to monitor the control region of the downlink frequency band, so as to obtain whether the base station configures downlink transmission in the uplink spectrum.
Step 507: the terminal side searches the resource allocation position in the downlink frequency band control area according to the formulaAnd (6) performing calculation. Since the terminal knows that it does not have any uplink transmission on subframe 6 according to the previous scheduling information, it knows that the base station occupies 2 OFDM symbols of the guard interval when allocating resources for it.
Step 508: and the terminal acquires downlink resource data in the uplink frequency band according to the scheduling information of the base station.
In one embodiment, as shown in fig. 6, the macro station configures a normal LTE FDD carrier, and the uplink frequency band in the micro station is configured as a full duplex frequency band. The macro base station can obtain the information of the downlink data sent by the micro station in the uplink frequency band due to the common identification of the baseband unit BBU by the macro base station, so that the elimination of the downlink interference of the micro station at the side of the macro station is realized. A terminal is a terminal that supports downlink transmission in a full duplex spectrum. At transmission time 5, the terminal has no uplink scheduling transmission and HARQ feedback from the base station, and as shown in fig. 8, at time 6, there is uplink transmission and feedback. The following mainly describes the processing procedure from the base station side.
Step 601: since the micro station configures full duplex in the uplink frequency band, the broadcast message SIB1 publishes the downlink transmission power value in the uplink frequency band.
Step 602: after receiving the capability of the UE, the MME supports the relevant capability of the terminal to the base station through the S1 message, and the base station stores the capability information and encapsulates it in the context of the UE.
Step 603: the base station indicates the configuration information about the full duplex frequency band to the terminal through the RRC message, and the configuration information comprises the following contents:
1. and whether the full duplex spectrum downlink transmission is scheduled through the downlink spectrum or not is set to be 0.
2. Size of guard interval: set to 10.
3. Control area size: set to 11.
Step 604: the base station side discovers the data caching quantity of the MAC layer of the base station in 10msSubtracting the amount of data that the terminal can transmit on the downlink spectrum within a time windowThe amount of data remaining thereafter still exceeds the threshold TCAThen consider that downlink transmission in the full duplex spectrum is turned on in this radio frame.
Step 605: if the MAC layer buffer of the terminal in the radio frame also exceeds the preset threshold, the terminal is assigned to downlink transmission in the uplink frequency band at a suitable time in the radio frame.
Step 606: in subframe 5, since there is no uplink transmission and no feedback from the terminal, it is considered that downlink transmission is configured for the terminal on the uplink frequency band.
Step 607: because the base station does not configure the terminal with 'full duplex spectrum downlink transmission by downlink spectrum scheduling', the downlink control information is carried by the uplink frequency band. The position of the control information in the uplink frequency band control region is according to the formulaAnd (6) performing calculation. Since the terminal has uplink transmission in subframe 6, it cannot occupy 2 OFDM symbols of the guard interval when allocating resources.
Step 608: the base station side sends down the resource allocation information of the uplink frequency band in the PDCCH of the uplink frequency band of the time slot 8, and transmits downlink resource data in the data transmission part of the uplink frequency band.
The data transmission method of the embodiment can allocate downlink transmission in the uplink spectrum, improve the frequency efficiency, and have good compatibility for terminals of different versions.
Fig. 9 is a block diagram of a base station according to an embodiment of the present invention, as shown in fig. 9: the base station 41 includes a resource allocation unit 411, a configuration information transmission unit 412, and a data transmission unit 413.
The resource allocation unit 411 configures an uplink spectrum in the paired spectrum as a full duplex spectrum in the paired spectrum transmission scheme. The configuration information transmitting unit 412 transmits configuration information of a full duplex spectrum to the terminal.
When it is determined that the terminal does not need to send data or feedback information in a subframe of an uplink radio frame according to the timing relationship of the HARQ, the data transmission unit 413 configures a resource corresponding to the terminal in the subframe to perform downlink transmission in a full-duplex spectrum, and sends resource scheduling information of the uplink and downlink transmission of the subframe in the full-duplex spectrum or the downlink spectrum.
The configuration information sending unit 411 determines whether the terminal supports downlink transmission in the full-duplex spectrum, and if so, sends configuration information of the full-duplex spectrum to the terminal. And if the terminal does not support downlink transmission in the full duplex spectrum, carrying out data transmission according to the FDD-LTE mode.
The configuration information of the full duplex spectrum includes: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number used for uplink and downlink transmission in the full duplex spectrum, a size of a guard interval, and a size of a control region (optional).
The subframe for downlink transmission in the full-duplex frequency band comprises: a control region, a data transmission region, and a guard interval region. The control region is configured to carry two channels, namely a PDCCH and a PCFICH, the PDCCH is configured to carry resource allocation information of the terminal, and the PCFICH is configured to indicate a size of the control region. The data area is used to carry user-specific data.
The guard interval region is used for the same terminal to receive the downlink data and carry out the conversion protection between the uplink data transmission. The data transmission unit 413 does not transmit any signal in the guard interval region of the downlink transmission subframe.
The guard interval region is independently configured for each terminal. When downlink transmission is performed on a terminal in N subframes in a full duplex spectrum, if it is determined that the terminal needs to perform uplink data transmission or feedback information in N +1 subframes according to the timing relationship of HARQ, the data transmission unit 413 starts a guard interval region for the downlink transmission of the terminal in the N subframes, otherwise the guard interval region is not started.
If the terminal is configured to schedule full duplex spectrum downlink transmission via the downlink spectrum, the resource allocation unit 411 follows the formulaResource mapping is carried out in the downlink frequency spectrum, otherwise, according to a formulaResource mapping is performed in a full duplex spectrum. Wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCIIndicating the downlink carrier number, n, of a full duplex spectrumCIFrom full duplex frequencyAnd acquiring configuration information of the spectrum.
The timing relationship of the uplink HARQ is specifically: the terminal transmits uplink in N subframes in the full duplex spectrum. The data transmission unit 413 transmits ACK or NACK through a PHICH channel in an N +4 subframe in a downlink spectrum, indicating whether data is correctly received. If NACK information is fed back, the data transmission unit 413 indicates retransmission configuration information in a PDCCH channel in an N +4 subframe, including: redundancy version, time-frequency resource position information for scheduling uplink transmission, MCS for uplink transmission and uplink MIMO.
The timing relationship of the downlink HARQ is specifically: the data transmission unit 413 sends downlink transmission in N subframes in the full duplex spectrum and/or performs downlink transmission in the downlink spectrum. The terminal sends an ACK or NACK in the N +4 subframes in the full duplex spectrum, indicating whether the data was received correctly. And if NACK information is fed back, the terminal monitors a control channel in the N +8 subframe to acquire retransmission information.
The base station of the embodiment can use the downlink resources of the network more flexibly, improves the frequency efficiency, has small access time delay, has good compatibility for terminals of different versions, and realizes the improvement of the throughput and terminal experience of the whole communication system.
Fig. 10 is a block diagram of an embodiment of a terminal according to the present invention. As shown in fig. 10, the terminal 51 includes: a configuration information receiving unit 511, a listening unit 512, a data transceiving unit 513, and a support information transmitting unit 514.
The configuration information receiving unit 511 receives configuration information of a full duplex spectrum from a base station, where the base station configures an uplink spectrum in a paired spectrum as the full duplex spectrum. When determining that data or feedback information does not need to be sent in a subframe of an uplink radio frame according to the HARQ timing relationship, the monitoring unit 512 monitors a full duplex spectrum or a downlink spectrum, and acquires resource scheduling information for performing downlink transmission in the full duplex spectrum. The data transceiver unit 513 acquires downlink data from a subframe of the uplink radio frame according to the resource scheduling information.
If the terminal supports downlink transmission in the full duplex frequency band, the support information sending unit 514 sends the support capability information to the network side through signaling. The support capability information includes: whether downlink data transmission in a full-duplex frequency band is supported, a list of frequency point information of supported full-duplex downlink transmission, and the like.
If the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrum, the listening unit 513 schedules full duplex spectrum downlink transmission according to the formulaObtaining resource distribution information in downlink frequency spectrum, otherwise, according to formulaAnd acquiring the allocation information of the resources in the full duplex spectrum. Wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCICarrier number, n, indicating full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
In one embodiment, a communication system is provided, which includes the base station and the terminal as above.
The data transmission method, the base station, the terminal and the mobile communication system provided by the embodiment have the following advantages:
1. good compatibility for each version of terminal: the deployment of a single flexible duplex technology on the network side can cause some old versions of terminals to be unable to normally access the network, and therefore obstacles can be generated for future deployment. The method, the base station, the terminal and the mobile communication system provided by the embodiment enable the old-version terminal to still consider that the current carrier is a traditional LTE FDD carrier, so that the old-version terminal has good terminal version compatibility.
2. The HARQ RTT time remains 8 ms: in both TDD-FDD carrier aggregation and flexible duplex technologies, the HARQ RTT is longer due to the change of the uplink and downlink timeslot correspondence, which results in longer transmission delay and lower throughput. The method, the base station, the terminal and the mobile communication system provided by the embodiment make full use of idle uplink spectrum resources on the basis of not influencing transmission of the HARQ RTT, and bring the advantages that the HARQ design table can still be designed according to the current LTE FDD single carrier scheme, and the method, the base station, the terminal and the mobile communication system are simple and have small access delay.
3. The efficiency of the frequency spectrum is improved: compared with TD-LTE, the method can flexibly use the guard interval between downlink and uplink, thereby maximizing the resource utilization rate and realizing the improvement of the spectrum efficiency.
4. The current protocol is relatively small in modification, and basic physical layer processes are designed based on the R8/9 protocol, so that the complexity is relatively low, and the future standardization is easy to promote.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention 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 invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (38)

1. A method of data transmission, comprising:
under the transmission mode of the paired frequency spectrums, the base station configures the uplink frequency spectrums in the paired frequency spectrums into full duplex frequency spectrums;
the base station sends the configuration information of the full duplex spectrum to a terminal;
when the base station determines that the terminal does not need to send data or feedback information in a subframe of an uplink wireless frame according to the timing relation of the HARQ, configuring the resource corresponding to the terminal in the subframe to carry out downlink transmission in the full duplex spectrum, and sending the resource scheduling information of the uplink and downlink transmission of the subframe on the full duplex spectrum or the downlink spectrum.
2. The method of claim 1, wherein:
the multi-access mode of downlink transmission in the full-duplex frequency spectrum adopts OFDMA, and the multi-access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA;
and the downlink frequency spectrum in the paired frequency spectrums is used for downlink transmission, and the adopted multiple access mode is OFDMA.
3. The method of claim 1 or 2, wherein the base station transmitting configuration information of a full duplex spectrum to a terminal comprises:
the base station judges whether the terminal supports downlink transmission in a full duplex frequency spectrum, if so, the base station sends configuration information of the full duplex frequency spectrum to the terminal, and if not, the base station transmits data according to an FDD-LTE mode.
4. The method of claim 3, wherein:
the configuration information of the full duplex spectrum comprises: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
5. The method of claim 4, wherein the configuration information of the full duplex spectrum further comprises: the size of the area is controlled.
6. The method of claim 5, wherein:
the subframe for downlink transmission in the full-duplex frequency band comprises: a control region and a data transmission region;
the control region is used for carrying two channels, namely a PDCCH and a PCFICH, the PDCCH is used for carrying resource allocation information of the terminal, and the PCFICH is used for indicating the size of the control region; the data area is used for carrying user-specific data.
7. The method of claim 6, wherein: the subframe for downlink transmission in the full-duplex frequency band further comprises: a guard interval region;
the protection interval region is used for the same terminal to receive the downlink data and carry out the conversion protection between the uplink data transmission;
wherein the base station does not transmit any signal in a guard interval region of the downlink transmission subframe.
8. The method of claim 7, wherein:
the guard interval region is independently configured for each terminal;
when downlink transmission is performed on the terminal in the N subframes in the full duplex spectrum, if it is determined that the terminal needs to perform uplink data transmission or feedback information in the N +1 subframe in the full duplex spectrum according to the timing relationship of the HARQ, the guard interval region is opened for the downlink transmission of the terminal in the N subframes, otherwise, the guard interval region is not opened.
9. The method of claim 6, wherein:
if the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrum, the base station follows the formulaResource mapping is carried out in downlink frequency spectrum, otherwise, the base station carries out resource mapping according to a formulaPerforming resource mapping in the full-duplex spectrum;
wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCIIndicating the downlink carrier number, n, of a full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
10. The method of claim 1, wherein the timing relationship of the uplink HARQ is specifically:
the terminal transmits uplink in N subframes in the full duplex spectrum;
the base station sends ACK or NACK through a PHICH channel in an N +4 subframe in the downlink frequency spectrum to indicate whether data is correctly received;
if NACK information is fed back, the base station indicates retransmission configuration information in a PDCCH channel in the N +4 subframe, including: redundancy version, time-frequency resource position information for scheduling uplink transmission, MCS for uplink transmission and uplink MIMO.
11. The method of claim 1, wherein the timing relationship of the downlink HARQ specifically is:
the base station sends downlink transmission in N subframes in the full duplex spectrum and/or carries out downlink transmission in the N subframes in the downlink spectrum;
the terminal sends ACK or NACK in the N +4 subframe in the full duplex spectrum to indicate whether the data is received correctly;
and if NACK information is fed back, the terminal monitors a control channel in the N +8 subframe to acquire retransmission information.
12. The method of claim 1, wherein:
if the base station determines the buffer data amount in the MAC layer entity corresponding to the terminalSubtracting the downlink spectrum in a time windowThe amount of data that the terminal can transmitIs greater than a preset threshold value TCAThe base station allocates downlink transmission in the full duplex spectrum for the terminal in the time window;
wherein the size of the time window and the T are configured through a network management systemCAThe above-mentionedAnd said
13. The method of any one of claims 1 to 12, further comprising:
a base station receives the supporting capability information reported by a terminal through a signaling;
wherein the support capability information includes: indication whether downlink data transmission in a full-duplex frequency band is supported, and frequency point information of supported full-duplex downlink transmission.
14. A method of data transmission, comprising:
the terminal receives configuration information of a full duplex spectrum from a base station, wherein the base station configures an uplink spectrum in a paired spectrum into the full duplex spectrum;
when the terminal determines that data or feedback information does not need to be sent in a subframe of an uplink wireless frame according to the HARQ timing relationship, monitoring a full duplex frequency spectrum or a downlink frequency spectrum, and acquiring resource scheduling information for downlink transmission in the full duplex frequency spectrum;
and the terminal acquires downlink data from a subframe of an uplink radio frame according to the resource scheduling information.
15. The method of claim 14, wherein:
the multi-access mode of downlink transmission in the full-duplex frequency spectrum adopts OFDMA, and the multi-access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA;
the downlink frequency spectrum in the paired frequency spectrums is specially used for downlink transmission, and the adopted multiple access mode is OFDMA.
16. The method of claim 14 or 15, wherein:
if the terminal supports downlink transmission in the full duplex frequency band, the terminal sends the supporting capability information to the network side through a signaling;
wherein the support capability information includes: whether downlink data transmission in a full-duplex frequency band is supported or not, and a list of frequency point information of supported full-duplex downlink transmission.
17. The method of claim 16, wherein:
the configuration information of the full duplex spectrum comprises: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
18. The method of claim 17, wherein the configuration information for the full duplex spectrum further comprises a control region size.
19. The method of claim 18, wherein:
if the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrum, the terminal follows the formulaAcquiring the resource allocation information in the downlink frequency spectrum, otherwise, the terminal acquires the resource allocation information according to a formulaAcquiring resource allocation information in a full duplex spectrum;
wherein,is the location of the search space, L represents the aggregation level, YkIs defined as follows, i is 0, …, L-1, and M is 0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCICarrier number, n, indicating full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
20. A base station, comprising:
a resource allocation unit, configured to configure an uplink spectrum in a paired spectrum as a full duplex spectrum in a paired spectrum transmission mode;
a configuration information sending unit, which sends the configuration information of the full duplex spectrum to the terminal;
and the data transmission unit is used for configuring the corresponding resources of the terminal in the subframe to perform downlink transmission in the full-duplex spectrum and transmitting the resource scheduling information of the uplink and downlink transmission of the subframe on the full-duplex spectrum or the downlink spectrum when the terminal does not need to transmit data or feedback information in the subframe of the uplink wireless frame according to the timing relation of the HARQ.
21. The base station of claim 20, wherein:
the multi-access mode of downlink transmission in the full-duplex frequency spectrum adopts OFDMA, and the multi-access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA;
the downlink frequency spectrum in the paired frequency spectrums is specially used for downlink transmission, and the adopted multiple access mode is OFDMA.
22. The base station of claim 20 or 21, wherein:
the configuration information sending unit is further configured to determine whether the terminal supports downlink transmission in a full duplex spectrum, and if so, send configuration information of the full duplex spectrum to the terminal;
and if the terminal does not support downlink transmission in the full duplex spectrum, performing data transmission according to the FDD-LTE mode.
23. The base station of claim 22, wherein the configuration information for the full duplex spectrum comprises: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
24. The base station of claim 23, wherein the configuration information for the full duplex spectrum further comprises: the size of the area is controlled.
25. The base station of claim 24, wherein:
the subframe for downlink transmission in the full-duplex frequency band comprises: a control region and a data transmission region;
the control region is used for carrying two channels, namely a PDCCH and a PCFICH, the PDCCH is used for carrying resource allocation information of the terminal, and the PCFICH is used for indicating the size of the control region; the data area is used for carrying user-specific data.
26. The base station of claim 25, wherein:
the subframe for downlink transmission in the full-duplex frequency band further comprises: a guard interval region;
the protection interval region is used for the same terminal to receive the downlink data and carry out the conversion protection between the uplink data transmission;
wherein the data transmission unit does not transmit any signal in a guard interval region of the downlink transmission subframe.
27. The base station of claim 26, wherein:
the guard interval region is independently configured for each terminal;
when downlink transmission is performed on a terminal in N subframes in the full duplex spectrum, if it is determined that the terminal needs to perform uplink data transmission or feedback information in N +1 subframes in the full duplex spectrum according to the timing relationship of HARQ, the data transmission unit starts the guard interval region for downlink transmission of the terminal in the N subframes, otherwise the guard interval region is not started.
28. The base station of claim 25, wherein:
the resource allocation unit is further configured to schedule full duplex spectrum downlink transmission through a downlink spectrum if the terminal is configured to schedule full duplex spectrum downlink transmission according to a formulaResource mapping is carried out in the downlink frequency spectrum, otherwise, according to a formulaPerforming resource mapping in the full-duplex spectrum;
wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCIIndicating the downlink carrier number, n, of a full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
29. The base station of claim 20, wherein the timing relationship of the uplink HARQ is specifically:
the terminal transmits uplink in N subframes in the full duplex spectrum;
the data transmission unit sends ACK or NACK through a PHICH in an N +4 subframe in the downlink frequency spectrum to indicate whether data is correctly received;
if NACK information is fed back, the data transmission unit indicates retransmission configuration information in a PDCCH channel in the N +4 subframe, including: redundancy version, time-frequency resource position information for scheduling uplink transmission, MCS for uplink transmission and uplink MIMO.
30. The base station of claim 20, wherein the timing relationship of the downlink HARQ specifically is:
the data transmission unit sends downlink transmission in N subframes in the full duplex spectrum and/or carries out downlink transmission in the N subframes in the downlink spectrum;
the terminal sends ACK or NACK in the N +4 subframe in the full duplex spectrum to indicate whether the data is received correctly;
and if NACK information is fed back, the terminal monitors a control channel in the N +8 subframe to acquire retransmission information.
31. The base station of claim 20, wherein:
the resource allocation unit is further configured to determine the amount of buffered data in the MAC layer entity corresponding to the terminal if the amount of buffered data is determinedSubtracting the amount of data that the terminal can transmit on the downlink spectrum within a time windowIs greater than a preset threshold value TCAThen downlink transmission is allocated to the terminal in the full duplex spectrum in the time window;
wherein the size of the time window and the T are configured through a network management systemCAThe above-mentionedAnd said
32. A terminal, comprising:
a configuration information receiving unit, configured to receive configuration information of a full duplex spectrum from a base station, where an uplink spectrum in a paired spectrum is configured as the full duplex spectrum by the base station;
a monitoring unit, configured to monitor a full duplex spectrum or a downlink spectrum and acquire resource scheduling information for performing downlink transmission in the full duplex spectrum when it is determined that data or feedback information does not need to be sent in a subframe of an uplink radio frame according to the HARQ timing relationship;
and the data transceiving unit is used for acquiring downlink data from a subframe of an uplink radio frame according to the resource scheduling information.
33. The terminal of claim 32, wherein:
the multi-access mode of downlink transmission in the full-duplex frequency spectrum adopts OFDMA, and the multi-access mode of uplink transmission adopts SC-FDMA or Nx SC-FMDA;
the downlink frequency spectrum in the paired frequency spectrums is specially used for downlink transmission, and the adopted multiple access mode is OFDMA.
34. The terminal according to claim 32 or 33, further comprising:
a supporting information sending unit, configured to send the supporting capability information to the network side through a signaling if the terminal supports downlink transmission in a full-duplex frequency band;
wherein the support capability information includes: whether downlink data transmission in a full-duplex frequency band is supported or not, and a list of frequency point information of supported full-duplex downlink transmission.
35. The terminal of claim 34, wherein:
the configuration information of the full duplex spectrum comprises: an indication of whether to schedule full duplex spectrum downlink transmission via a downlink spectrum, a carrier sequence number for uplink and downlink transmission in the full duplex spectrum, and a size of a guard interval.
36. The terminal of claim 35, wherein the configuration information for the full duplex spectrum further includes a control region size.
37. The terminal of claim 36, wherein:
the monitoring unit is further configured to schedule full duplex spectrum downlink transmission according to a formula if the terminal is configured to schedule full duplex spectrum downlink transmission through the downlink spectrumObtaining resource distribution information in downlink frequency spectrum, otherwise, according to formulaAcquiring resource allocation information in a full duplex spectrum;
wherein,is the location of the search space, L denotes the aggregation level, i-0, …, L-1, and M-0, …, M(L)-1，M(L)Is the number of PDCCHs that need to be detected in a given search space, nCICarrier number, n, indicating full duplex spectrumCIAnd acquiring configuration information of the full duplex spectrum.
38. A communication system, characterized by:
comprising a base station according to any of claims 20-31, a terminal according to any of claims 32-37.
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