WO2020125368A1 - 一种用于载波聚合系统的通信方法、终端及网络设备 - Google Patents

一种用于载波聚合系统的通信方法、终端及网络设备 Download PDF

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Publication number
WO2020125368A1
WO2020125368A1 PCT/CN2019/121514 CN2019121514W WO2020125368A1 WO 2020125368 A1 WO2020125368 A1 WO 2020125368A1 CN 2019121514 W CN2019121514 W CN 2019121514W WO 2020125368 A1 WO2020125368 A1 WO 2020125368A1
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Prior art keywords
stti
carrier
subframe
downlink
ofdm symbols
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PCT/CN2019/121514
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English (en)
French (fr)
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严朝译
罗泽宙
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华为技术有限公司
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Priority to EP19899013.7A priority Critical patent/EP3883164A4/en
Priority to JP2021533250A priority patent/JP7243010B2/ja
Publication of WO2020125368A1 publication Critical patent/WO2020125368A1/zh
Priority to US17/349,524 priority patent/US11936572B2/en

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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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • 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
    • 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
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04L5/0078—Timing of allocation
    • 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
    • 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
    • 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
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • 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
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method, terminal, and network equipment for a carrier aggregation system.
  • TTI transmission time interval
  • sTTI short transmission time interval
  • OFDM orthogonal frequency division multiplexing
  • the standard specification of sTTI specified in 3GPP Rel-15 shortens and adjusts the scheduling TTI of the long-term evolution (LTE) system that was originally 1 ms, that is, one subframe, specifically frequency division duplex (frequency division division) Duplex (FDD) system scheduling TTI is shortened from 1ms to the minimum sTTI can use 2 OFDM symbols, the length is about 0.14ms; and time division duplex (time division duplex (TDD) system scheduling TTI is shortened from 1ms to 7 OFDM
  • the symbol is the minimum sTTI that can be scheduled, and the length is 0.5 ms.
  • the number of symbols occupied by the sTTI of the conventional subframe (1ms) of the existing FDD carrier can be 2 and 3.
  • pattern1 ⁇ 3,2,2,2, 2,3 ⁇ is used when the traditional control area occupies 1 or 3 OFDM symbols
  • pattern2 ⁇ 2,3,2,2,2,3 ⁇ is used when the traditional control area occupies 2 OFDM symbols.
  • the downlink feedback of TDD is carried on the FDD carrier.
  • 3GPP 3rd Generation Partnership Project
  • the terminal can generate one feedback message every 2/3 OFDM symbols received by the FDD carrier, and each uplink subframe of TDD can only provide two feedback opportunities, and there is a bottleneck in feedback. Therefore, regardless of the above situation, the existence of feedback bottlenecks leads to the transmission delay of feedback information.
  • Embodiments of the present application provide a communication method for a carrier aggregation system, which can avoid feedback bottlenecks in a TDD-FDD carrier aggregation system to a certain extent and reduce air interface delay.
  • the embodiments of the present application also provide corresponding equipment.
  • a first aspect of the present application provides a communication method for a carrier aggregation system.
  • the carrier aggregation system is a carrier aggregation system including a time division duplex TDD carrier and a frequency division duplex FDD carrier.
  • the method includes that the terminal device receives a downlink through a secondary carrier.
  • the downlink information may be information such as the following physical physical channel scheduled by the physical downlink control channel; the terminal device sends feedback information for the downlink information through the primary carrier, and the feedback information may be a hybrid automatic retransmission message, etc., when the primary
  • the carrier or the secondary carrier is a TDD carrier
  • there is at least one first subframe in the TDD carrier usually one subframe contains 14 OFDM symbols, and the first subframe contains P consecutive sTTIs, that is, 14 subframes
  • the OFDM symbol is divided into P transmission time intervals sTTI, and each sTTI may include the same or different number of OFDM symbols.
  • the P sTTIs there is at least one sTTI that occupies 2 OFDM symbols.
  • P is an integer greater than 1, such as A subframe is divided into 7 sTTIs, and each sTTI occupies 2 PFDM symbols.
  • the minimum scheduling unit of the TDD carrier in the carrier aggregation system is the sTTI of 2 OFDM symbols.
  • Scheduling delay when it is used as the primary carrier, can increase the feedback opportunity of the system.
  • it is used as the secondary carrier it can make full use of the feedback opportunity of the system, thereby reducing the feedback bottleneck in the carrier aggregation system and reducing the air interface delay.
  • the first subframe includes an sTTI occupying 2 OFDM symbols and an sTTI occupying 3 OFDM symbols, for example, the first subframe may include 6 sTTIs, which may include four sTTIs occupying 2 PFDM symbols and two sTTIs occupying 3 OFDM symbols.
  • the first subframe is divided into a combination of 2 OFDM symbol sTTI and 3 OFDM symbol sTTI, considering the half-frame when the subframe is divided into sTTI Boundary problem, this division method can divide the subframe into smaller transmission time intervals to the greatest extent, provide more opportunities to transmit information, balance the scheduling delay of TDD carriers and FDD carriers to a certain extent, and reduce feedback bottlenecks To reduce air interface delay.
  • the terminal device passes The secondary carrier receiving downlink information includes: the terminal device receives downlink information through a first sTTI in the first subframe of the secondary carrier, where the first sTTI is one of the P sTTIs; correspondingly , The terminal device sends feedback information for the downlink information through the primary carrier, including: the terminal device sends feedback information for the downlink information through the second sTTI of the primary carrier, the second sTTI There is a timing relationship with the first sTTI.
  • the terminal device when the minimum scheduling unit of the TDD carrier is set to the sTTI of 2 OFDM symbols, and the TDD carrier is the secondary carrier, and the FDD carrier is the primary carrier, the terminal device can pass The downlink information is transmitted in a smaller transmission time interval, so that the uplink feedback opportunity of the FDD carrier can be fully utilized, thereby reducing the air interface delay of the carrier aggregation system.
  • the terminal device receives downlink information through the first sTTI of the first subframe of the secondary carrier, including: The terminal device receives the downlink information through sTTI n in a downlink subframe of the secondary carrier, where sTTI n represents an sTTI with index index n, and the sTTI n is M consecutive subframes in the carrier aggregation system Among the N sTTIs included in the n-th sTTI, the M is an integer greater than 0, and the N is an integer greater than M.
  • the carrier aggregation system includes 10 consecutive subframes, If each subframe is divided into 6 sTTIs, then 10 consecutive subframes include 60 sTTIs, and the 60 sTTIs can be numbered according to the timing to obtain the index mark corresponding to each sTTI, and each sTTI of the same link corresponds to A unique index mark; correspondingly, the terminal device sending feedback information for the downlink information through the second sTTI of the primary carrier includes: the terminal device passing the uplink subframe of the primary carrier STTI m sends feedback information for the downlink information, the sTTI m represents the sTTI with index index m, and the sTTI m is the N sTTIs contained in M consecutive subframes in the carrier aggregation system according to The sTTI in the m-th sequence is ranked, and the value of m is the same as the index value of the sTTI used for transmitting feedback information when the downlink information is delivered through the sTTI
  • the FDD carrier when used as the primary carrier, every 2/3 OFDM symbols can generate an opportunity to transmit uplink information, and the TDD carrier used as the secondary carrier uses 2/3 OFDM
  • the same number of consecutive subframes in the carrier aggregation system can contain the same number of sTTI, so that the TDD carrier and the FDD carrier can maintain the scheduling time interval balance to a large extent, because the terminal equipment receives
  • the downlink information delivered through the nth sTTI of the downlink of the primary carrier is the feedback of the downlink information through the mth sTTI of the uplink of the primary carrier, so the downlink information received through the nth sTTI of the secondary carrier It is also possible to feed back the downlink information through the mth sTTI of the uplink of the primary carrier according to the timing relationship of the primary carrier, thereby ensuring the accuracy of information transmission in the carrier aggregation system.
  • m is equal to n+4, that is, the downlink information carried on the sTTI n of the secondary carrier, and the timing relationship is the nth from the primary carrier. +4 sTTIs for feedback.
  • the number of 4 sTTI symbols is about 8-12 OFDM symbols, which can ensure that the terminal device can have enough time to analyze the received downlink information, and can also make the feedback information as short as possible. Feedback to the base station within the time, so as to ensure the accuracy of information transmission and reduce the air interface delay of information transmission to a certain extent.
  • the terminal device passes The secondary carrier receiving downlink information includes: the terminal device receives the downlink information through the first sTTI of the secondary carrier; correspondingly, the terminal device sends feedback information for the downlink information through the primary carrier, including: The terminal device sends feedback information for the downlink information through the second sTTI in the first subframe of the primary carrier, the second sTTI is one of the P sTTIs, and the first sTTI There is a timing relationship with the second sTTI.
  • the minimum scheduling unit is set to the sTTI of 2 OFDM symbols, thereby providing more opportunities for uplink feedback.
  • the terminal device can timely feedback the downlink information through more feedback opportunities on the primary carrier, thereby reducing the air interface delay of the carrier aggregation system.
  • the terminal device receiving downlink information through the second sTTI of the secondary carrier includes: The sTTI n in the downlink subframe of the carrier receives the downlink information, where the sTTI n represents the sTTI with index index n, and the sTTI n is N sTTIs contained in M consecutive subframes in the carrier aggregation system In the nth sTTI according to the timing, the M is an integer greater than 0, and the N is an integer greater than M; correspondingly, the terminal device passes the first subframe of the primary carrier One sTTI sends feedback information for the downlink information, including: the terminal device sends feedback information for the downlink information through sTTI m in the uplink
  • the secondary carrier is an FDD carrier, and every 2/3 OFDM symbols can transmit one downlink message to the terminal device.
  • the primary carrier is a TDD carrier
  • 2/3 OFDM symbols are used
  • the sTTI of the scheduled transmission time interval is used, the same number of subframes in the same number of subframes in the carrier aggregation system can make the TDD carrier and the FDD carrier maintain the scheduling time interval balance to a large extent.
  • the n-th sTTI may be feedback of downlink information through the m-th sTTI in its uplink. Therefore, the downlink information received by the terminal device through the n-th sTTI in the secondary carrier may also be based on the timing relationship of the primary carrier.
  • the m-th sTTI of the uplink of the primary carrier feeds back the downlink information, thereby ensuring the accuracy of information transmission.
  • m is equal to n+k, and k is an integer greater than 3, that is, the downlink information carried by the n-th sTTI
  • the timing relationship is feedback from the n+k th sTTI of the TDD carrier. More than 3 sTTIs contain 8 or more OFDM symbols, so as to ensure that the terminal device can have sufficient time to analyze the received downlink information and can also The feedback information is fed back to the base station in the shortest possible time, so as to ensure the accuracy of information transmission and reduce the air interface delay.
  • any one of the first to seventh possible implementation manners of the first aspect in an eighth possible implementation manner, if the first subframe is a downlink subframe and the physical downlink The number of OFDM symbols occupied by the control channel PDCCH is 3, then the number of OFDM symbols occupied by the first sTTI to the last sTTI included in the first subframe is 3, 2, 2, 2, 2, 3 in sequence.
  • the first subframe is a downlink subframe and the physical downlink
  • the number of OFDM symbols occupied by the control channel PDCCH is 1 or 2
  • the number of OFDM symbols occupied by the first sTTI to the last sTTI included in the first subframe is 2, 3, 2, 2, 2, 3 in sequence Or 2,2,3,2,2,3.
  • the first subframe is an uplink subframe
  • the The number of OFDM symbols occupied by the first sTTI to the last sTTI included in the first subframe is 3, 2, 2, 2, 2, 2, 3 in sequence.
  • a second aspect of the present application provides a communication method for a carrier aggregation system.
  • the carrier aggregation system is a carrier aggregation system including a time division duplex TDD carrier and a frequency division duplex FDD carrier.
  • the method includes: the base station uses a secondary carrier Sending downlink information; the base station receives feedback information for the downlink information through the primary carrier, and when the primary carrier or the secondary carrier is the TDD carrier, at least one first subframe exists in the TDD carrier , The first subframe includes P consecutive short transmission time intervals sTTI, there is at least one sTTI occupying 2 orthogonal frequency division multiplexing OFDM symbols among the P sTTIs, and the P is an integer greater than 1.
  • the first subframe includes the sTTI occupying 2 OFDM symbols and the sTTI occupying 3 OFDM symbols.
  • the base station uses the secondary The carrier sending downlink information includes: the base station sending downlink information through the first sTTI in the first subframe of the secondary carrier; correspondingly, the base station receives feedback information for the downlink information through the primary carrier Includes: the base station receives feedback information for the downlink information through a second sTTI of the primary carrier, and the second sTTI has a timing relationship with the first sTTI.
  • the base station when each subframe of the secondary carrier is the first subframe and each subframe of the primary carrier When the sTTI occupies 2 OFDM symbols and the sTTI occupies 3 OFDM symbols, the base station sends downlink information through the first sTTI of the first subframe of the secondary carrier, including: The base station sends the downlink information through sTTI n in the downlink subframe of the secondary carrier, where sTTI n represents the sTTI with index index n, and the sTTI n is the number of consecutive subframes in the carrier aggregation system.
  • the feedback information for the downlink information includes: the base station receives feedback information for the downlink information through the sTTI m in the uplink subframe of the primary carrier, where the sTTI m represents the sTTI with index index m,
  • the sTTI m is the mth sTTI among the N sTTIs included in the M consecutive subframes in the carrier aggregation system according to the timing, and the value of m is in the downlink subframe passing through the primary carrier
  • the index value of the sTTI n corresponding to the sTTI used for transmitting feedback information when the downlink information is delivered is the same.
  • the m is equal to n+4.
  • the base station uses the secondary
  • the sending of downlink information by the carrier includes: the base station sending downlink information through the first sTTI of the secondary carrier; correspondingly, the base station receiving feedback information for the downlink information through the primary carrier includes: The second sTTI in the first subframe of the primary carrier receives feedback information for the downlink information, and there is a timing relationship between the first sTTI and the second sTTI.
  • the base station sending downlink information through the second sTTI of the secondary carrier includes: The sTTI n in the downlink subframe sends the downlink information, where the sTTI n represents the sTTI with index index n, and the sTTI n is the N sTTIs contained in the M consecutive subframes in the carrier aggregation system according to In the nth sTTI, the M is an integer greater than 0, and the N is an integer greater than M; correspondingly, the base station receives through the first sTTI of the first subframe of the primary carrier
  • the feedback information for the downlink information includes: the base station receives feedback information for the downlink information through the sTTI m in the uplink subframe of
  • the m is equal to n+k, and the k is an integer greater than 3.
  • the first subframe is a downlink subframe and the physical downlink
  • the number of OFDM symbols occupied by the control channel PDCCH is 3, then the number of OFDM symbols occupied by the first sTTI to the last sTTI included in the first subframe is 3, 2, 2, 2, 2, 3 in sequence.
  • the first subframe is a downlink subframe and the physical downlink
  • the number of OFDM symbols occupied by the control channel PDCCH is 1 or 2
  • the number of OFDM symbols occupied by the first sTTI to the last sTTI included in the first subframe is 2, 3, 2, 2, 2, 3 in sequence Or 2,2,3,2,2,3.
  • the first subframe is an uplink subframe
  • the The number of OFDM symbols occupied by the first sTTI to the last sTTI included in the first subframe is 3, 2, 2, 2, 2, 2, 3 in sequence.
  • a third aspect of the present application provides a communication device for performing the communication method for a carrier aggregation system in the first aspect or any possible implementation manner of the first aspect.
  • the terminal device may include a module for performing the communication method for the carrier aggregation system in the first aspect or any possible implementation manner of the first aspect.
  • a fourth aspect of the present application provides a communication device.
  • the terminal device includes a memory and a processor.
  • the memory is used to store instructions.
  • the processor is used to execute the instructions stored in the memory. Execution of the instructions causes the processor to execute the method in the first aspect or any possible implementation manner of the first aspect.
  • a fifth aspect of the present application provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the first aspect or the method in any possible implementation manner of the first aspect.
  • a sixth aspect of the present application provides a network device for performing the communication method for a carrier aggregation system in the second aspect or any possible implementation manner of the second aspect.
  • the network device may include a module for performing the communication method for the carrier aggregation system in the second aspect or any possible implementation manner of the second aspect.
  • a seventh aspect of the present application provides a network device.
  • the network device includes a memory and a processor.
  • the memory is used to store instructions.
  • the processor is used to execute the instructions stored in the memory.
  • the execution of the instructions causes the processor to execute the method in the second aspect or any possible implementation manner of the second aspect.
  • An eighth aspect of the present application provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the second aspect or the method in any possible implementation manner of the second aspect.
  • the embodiment of the present application adopts a communication method for a carrier aggregation system.
  • the minimum scheduling unit of a TDD carrier in the carrier aggregation system is an sTTI of 2 OFDM symbols.
  • a certain transmission time can be achieved.
  • the scheduling delay of the TDD carrier and FDD carrier in the carrier aggregation system is balanced.
  • it When it is used as the primary carrier, it can increase the feedback opportunity of the system.
  • it When it is used as the secondary carrier, it can make full use of the feedback opportunity of the system, thereby reducing carrier aggregation.
  • the feedback bottleneck in the system reduces the air interface delay.
  • FIG. 1 is a schematic diagram of an embodiment of a communication system in an embodiment of this application.
  • FIG. 2 is a schematic diagram of an embodiment of a communication method for a carrier aggregation system in an embodiment of this application;
  • FIG. 3 is a schematic diagram of an sTTI division mode of a first subframe in a TDD carrier in an embodiment of this application;
  • FIG. 4 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of this application;
  • FIG. 5 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of the present application
  • FIG. 6 is a schematic diagram of an embodiment of a radio frame of a carrier aggregation system in an embodiment of this application;
  • FIG. 7 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of this application.
  • FIG. 8 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of this application;
  • FIG. 9 is a schematic diagram of another embodiment of a radio frame of a carrier aggregation system in an embodiment of the present application.
  • FIG. 10 is a schematic diagram of an embodiment of a communication device provided by an embodiment of this application.
  • FIG. 11 is a schematic diagram of another embodiment of a communication device provided by an embodiment of this application.
  • FIG. 12 is a schematic diagram of an embodiment of a network device provided by an embodiment of this application.
  • FIG. 13 is a schematic diagram of another embodiment of a network device provided by an embodiment of this application.
  • FIG. 14 is a schematic diagram of another embodiment of a communication device provided by an embodiment of this application.
  • 15 is a schematic diagram of another embodiment of a communication device provided by an embodiment of this application.
  • 16 is a schematic diagram of another embodiment of a communication device provided by an embodiment of this application.
  • FIG. 17 is a schematic diagram of another embodiment of a network device provided by an embodiment of this application.
  • the embodiment of the present application adopts a communication method for a carrier aggregation system.
  • the minimum scheduling unit of a TDD carrier in the carrier aggregation system is an sTTI of 2 OFDM symbols.
  • a certain transmission time can be achieved.
  • the scheduling delay of TDD carrier and FDD carrier is balanced.
  • it When it is used as the primary carrier, it can increase the feedback opportunity of the system.
  • it When it is used as the secondary carrier, it can fully utilize the feedback opportunity of the system, thereby reducing the feedback in the carrier aggregation system.
  • Bottleneck reduce air interface delay.
  • Embodiments of the present invention also provide corresponding terminal equipment and network equipment. The details are described below.
  • LTE long term evolution
  • UMTS universal mobile telecommunications system
  • UTRAN universal mobile telecommunications system
  • GSM global mobile system
  • GSM global mobile system
  • GSM global mobile system
  • EDGE enhanced data for rate GSM evolution
  • GSM EDGE radio access network GERAN
  • the function of the MME is performed by the general packet radio service (GPRS) support node (serving GPRS support, SGSN), and the function of the SGW ⁇ PGW is provided by the gateway GPRS support node (gateway GPRS support (node, GGSN) is completed.
  • GPRS general packet radio service
  • gateway GPRS support node gateway GPRS support node
  • PLMN public land mobile network
  • 5G communication system or a communication system after 5G, etc. which are not limited in the embodiments of the present application .
  • the terminal device may be a device that includes a wireless transceiver function and can cooperate with a network device to provide a communication service for a user.
  • terminal equipment may refer to user equipment (user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, User agent or user device.
  • UE user equipment
  • the terminal device may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (wireless local loop (WLL) station, a personal digital processing (personal digital ssistant, PDA), a wireless Handheld devices, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in a 5G network or a network after 5G, etc., which are not limited by the embodiments of the present application.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital processing
  • the embodiments of the present application also relate to network equipment.
  • the network device may be a device used to communicate with the terminal device, for example, it may be a base station (BTS) in GSM system or CDMA, or a base station (NodeB, NB) in WCDMA system, or it may be Evolutionary base station (evolutional node B, eNB or eNodeB) in the LTE system, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and a network side device in a future 5G network or a network after 5G or Network equipment in the PLMN network that will evolve in the future.
  • BTS base station
  • NodeB NodeB
  • NB base station
  • eNodeB Evolutionary base station
  • the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and a network side device in a future 5G network or a network after 5G or Network
  • the network equipment involved in the embodiments of the present application may also be referred to as a radio access network (radio access network, RAN) equipment.
  • the RAN device is connected to the terminal device and is used to receive data from the terminal device and send it to the core network device.
  • RAN devices correspond to different devices in different communication systems, for example, correspond to base stations and base station controllers in 2G systems, and correspond to base stations and radio network controllers (RNCs) in 3G systems, and evolve in 4G systems.
  • An evolutionary base station evolutional node B, eNB
  • an access network device eg, gNB, CU, DU
  • NR new radio access technology
  • FIG. 1 is a schematic diagram of an embodiment of a communication system in an embodiment of the present application.
  • the network device and the communication device, the communication device may be a terminal device, in the following embodiments, the communication device is a terminal device as an example for description, in addition to the terminal device, the communication device in the embodiment of the present application may also be a circuit, should not It is understood to be only terminal equipment.
  • the communication system in the embodiments of the present application may include any other number of terminal devices, network devices, or a combination thereof.
  • the network settings of the two entities shown in FIG. 1, the network device and the communication device are only considered to be non-limiting examples of embodiments of the present application.
  • the terminal after receiving a packet of downlink information through the downlink, the terminal transmits feedback information for the downlink information to the base station, that is, a hybrid automatic repeat request (hybrid automatic repeat request). repeat (request, HARQ) message.
  • HARQ feedback is carried out in the uplink, and is sent in response to the following shared physical channel (physical downlink shared channel, PDSCH) and semi-persistent cheduling scheduled by the physical downlink control channel (PDCCH) , SPS) PDSCH or PDCCH indicating SPS release or enhanced physical downlink control channel (enhanced physical downlink control channel, EPDCCH) and other information.
  • shared physical channel physical downlink shared channel
  • PDSCH physical downlink control channel
  • SPS physical downlink control channel
  • EPDCCH enhanced physical downlink control channel
  • HARQ messages can include acknowledgement (ACK) or non-acknowledgement (NACK), and three feedback states that can be used: ACK, NACK, and discontinuous transmission (DTX).
  • ACK acknowledgement
  • NACK non-acknowledgement
  • DTX discontinuous transmission
  • a successful decoding attempt results in ACK, while NACK is sent when the decoding attempt is unsuccessful
  • DTX refers to discontinuous transmission, which occurs when the UE does not receive any PDSCH, for example, missed to receive the transmitted PDCCH/EPDCCH, or there is no transmitted PDCCH/EPDCCH Occurs when EPDCCH or PDSCH.
  • the terms downlink, downlink transmission, downlink, downlink information, etc. may be used to indicate transmission from the network device to the terminal device.
  • uplink, uplink transmission, uplink, uplink information, etc. can be used for transmission in the opposite direction, that is, transmission from the terminal device to the network device.
  • carrier aggregation is performed by receiving or transmitting on a serving cell set, where the serving cell includes at least one downlink component carrier, and possibly one uplink component Carrier wave.
  • the concept of a cell may not refer to a geometric area, but should be regarded as a logical concept.
  • the terminal is always configured with a primary serving cell (primary cell, PCell) and a secondary serving cell (secondary cell, SCell).
  • PCell can also be replaced by the concept of primary carrier (PCC)
  • SCell can also be replaced by the concept of secondary carrier (SCC).
  • PUCCH primary uplink control channel
  • Some embodiments define a method for TDD and FDD carrier aggregation for sending HARQ feedback on a physical uplink shared channel (PUSCH) in the primary carrier of the wireless communication system in FIG. 1. Therefore, the carrier aggregation system in the embodiment of the present application uses at least one TDD carrier and at least one FDD carrier, and the specific number is not limited herein.
  • PUSCH physical uplink shared channel
  • the terminal will transmit feedback information on the primary carrier.
  • HARQ feedback is provided in the PUCCH of the primary carrier, including ACK and NACK messages corresponding to the downlink information received in the downlink.
  • data transmission is mainly arranged in subframes (for example, 1 ms, 14 OFDM symbols) or a shorter transmission time interval TTI in the subframe division.
  • a group of subframes may constitute a radio frame (for example, 10 ms long),
  • a group of TTIs can constitute a subframe (1 ms). Therefore, the uplink subframe can be used to transmit HARQ information corresponding to multiple downlink subframes.
  • multiple downlink subframes or multiple downlink TTIs in the FDD carrier may be associated with one uplink subframe or TTI in the TDD carrier, specifying Carry HARQ feedback for FDD carriers and TDD carriers; if the FDD carrier is configured as the main carrier, one or more downlink subframes or TTIs in the TDD carrier may be associated with one uplink subframe or TTI of the FDD carrier.
  • TTI is the smallest unit of scheduling, which directly determines the size of the air interface delay.
  • Using a shorter transmission delay sTTI in the communication process can effectively reduce the buffering requirements of the terminal and the evolved node, and can also improve the utilization efficiency of wireless resources. Therefore, the embodiments of the present application provide a communication method for a carrier aggregation system.
  • the TDD carrier in the carrier aggregation system uses an sTTI occupying 2 OFDM symbols as the minimum scheduled transmission time interval. For details, refer to FIG. 2.
  • FIG. 2 is a schematic diagram of an embodiment of a communication method for a carrier aggregation system in an embodiment of the present application, including:
  • the terminal receives downlink information through the secondary carrier.
  • the carrier aggregation system in the embodiment of the present application is a carrier aggregation system including FDD carriers and TDD carriers, and the carrier aggregation system includes one primary carrier and at least one secondary carrier.
  • the primary carrier is an FDD carrier and the secondary carrier is a TDD carrier
  • the carrier aggregation system may also include other secondary carriers in addition to the TDD carrier, such as other TDD carriers or other FDD carriers.
  • the primary carrier is a TDD carrier
  • the secondary carrier is an FDD carrier
  • the carrier aggregation system may also include other secondary carriers in addition to the FDD carrier, such as other FDD carriers or other TDD carriers.
  • the carrier aggregation system in the embodiment of the present application uses at least one TDD carrier and at least one FDD carrier, but the specific numbers of TDD carriers and FDD carriers are not limited herein.
  • the terminal will receive downlink information transmitted by the base station through the downlink of the TDD carrier; when the primary carrier is a TDD carrier, the secondary carrier When it is an FDD carrier, the terminal receives the downlink information transmitted by the base station through the downlink of the FDD carrier.
  • the terminal sends feedback information for the downlink information through the primary carrier.
  • the primary carrier or the secondary carrier is a TDD carrier
  • at least one first subframe including P sTTIs exists in the TDD carrier, where at least one of the P sTTIs There is an sTTI occupying 2 OFDM symbols, and P is an integer greater than 1.
  • the primary carrier may be a TDD carrier, and in this case, the secondary carrier is an FDD carrier; the primary carrier may also be an FDD carrier, and in this case, the secondary carrier is a TDD carrier.
  • the TDD carrier can be divided into multiple scheduling units during the communication process.
  • the scheduling unit here refers to the time interval for the terminal device and the base station to transmit information.
  • a scheduling unit in the TDD carrier can be a subframe or a Time slot (length of half a subframe), etc.
  • the TDD carrier in the embodiment of the present application includes at least one first subframe, and the first subframe is divided into P smaller sTTIs for transmitting information, and each sTTI can be used as a scheduling unit to transmit a base station or a terminal The information that the device needs to send. Among them, there are at least one sTTI in the P sTTIs.
  • the number of OFDM symbols is 2, so that the TDD carrier has a very small transmission time interval as the scheduling unit, that is, the sTTI of 2 OFDM symbols.
  • the length of a conventional subframe is 14 OFDM symbols, 14 OFDM symbols are 1 ms, and 2 OFDM symbols are about 0.14 ms.
  • the terminal device after receiving the downlink information sent by the base station through the secondary carrier, the terminal device generates corresponding feedback information for the downlink information, and transmits the feedback information of the downlink information to the base station through the uplink of the primary carrier.
  • the feedback information in the embodiments of the present application refers to a type of information related to the downlink information that the terminal needs to transmit to the base station according to the received downlink information, for example, a judgment information for the downlink information Or associated uplink scheduling information, etc., the embodiments of the present application do not specifically limit the specific types of downlink information and corresponding feedback information.
  • the sTTI of 2 or 3 OFDM symbols can be used to divide the subframe of the FDD carrier, and optionally, the sTTI of 7 OFDM symbols can also be used to subframe the FDD carrier For division, or alternatively, sTTIs with other lengths may be used to divide the subframes.
  • the embodiment of the present application does not specifically limit the division mode of the FDD carrier subframes.
  • the embodiment of the present application adopts a communication method for a carrier aggregation system.
  • the minimum scheduling unit of a TDD carrier in the carrier aggregation system is an sTTI of 2 OFDM symbols.
  • a certain transmission time can be achieved.
  • the scheduling delay of TDD carrier and FDD carrier is balanced.
  • it When it is used as the primary carrier, it can increase the feedback opportunity of the system.
  • it When it is used as the secondary carrier, it can make full use of the feedback opportunity of the system, thereby reducing the feedback in the carrier aggregation system. Bottleneck, reduce air interface delay.
  • the embodiment of the present application also provides a method for dividing the sTTI of the subframe of the TDD carrier, please refer to FIG. 3 for details.
  • FIG. 3 is a schematic diagram of an sTTI division mode of a first subframe in a TDD carrier in an embodiment of this application.
  • FIG. 3 shows three structures 301, 302, and 303 of the sTTI division of the first subframe in the TDD carrier.
  • the structure 301 is the first division mode of the first subframe, which is ⁇ 3,2,2,2,2,3 ⁇
  • the structure 302 is the second division mode of the first subframe.
  • the structure 303 is the third division mode of the first subframe, which is ⁇ 2,2,3,2,2,3 ⁇ .
  • the structure 301 is suitable for the traditional control region, such as the PDCCH in 3GPP LTE, which occupies 3 OFDM symbols, and the structure 302 and the structure 303 are suitable for the traditional control region, such as 3GPP LTE
  • the PDCCH in occupies 1 or 2 OFDM symbols.
  • the first subframe shown in FIG. 3 is a conventional subframe with a length of 1 ms and contains 14 OFDM symbols.
  • the subframe length of the TDD carrier may also contain other numbers of OFDM symbols. Other lengths.
  • the sTTI of 2 or 3 OFDM symbols in the embodiment of the present application or a combination of the two may still be used to perform the subframe.
  • FIG. 4 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of the present application, including:
  • the terminal device receives downlink information through a first sTTI in a first subframe of a secondary carrier, where the first subframe includes sTTIs occupying OFDM symbols 2 and 3.
  • the primary carrier is an FDD carrier
  • the secondary carrier is a TDD carrier.
  • the first subframe may be composed of P sTTIs occupying 2 OFDM symbols and 3 sTTIs occupying OFDM symbols, that is, in the secondary carrier
  • the secondary carrier in the embodiment of the present application may partially include the above-mentioned first subframe, and may also include subframes of other sTTI division modes, for example, a subframe composed of two sTTIs of 7 OFDM symbols , Or include subframes that are not divided into smaller sTTIs, as the scheduling unit of the secondary carrier; in addition, the subframes in the secondary carrier in the embodiment of the present application may all be the first subframe, that is, the secondary carrier Each subframe of is divided into sTTI of 2/3 OFDM symbols, which is not limited in this embodiment of the present application.
  • the terminal device may receive the downlink information sent by the base station through the sTTI with 2 or 3 OFDM symbols occupied, that is, the downlink information sent by the first sTTI in the first subframe on the secondary carrier ,
  • the first sTTI is one of P sTTIs in the first subframe.
  • the carrier aggregation system in the embodiment of the present application may also include other secondary carriers in addition to the TDD carrier, such as other TDD carriers or other FDD carriers.
  • other secondary carriers such as other TDD carriers or other FDD carriers.
  • the number of TDD carriers and FDD carriers in the embodiment of the present application No specific restrictions are made here.
  • the terminal device sends feedback information for the downlink information through the second sTTI of the primary carrier, where the second sTTI has a timing relationship with the first sTTI.
  • the terminal device after receiving the downlink information delivered by the base station through the sTTI occupying 2 or 3 OFDM symbols, the terminal device generates corresponding feedback information for the downlink information and passes the uplink of the primary carrier Of the second sTTI transmits feedback information of the downlink information to the base station.
  • the second sTTI in the embodiment of the present application refers to one of the multiple scheduling units into which the primary carrier is divided during the communication process
  • the scheduling unit here refers to the terminal and the base station in the primary The time interval for transmitting information on the carrier.
  • the scheduling unit in the main carrier may be a subframe (1ms) or a time slot (7 PFDM symbols) or a shorter transmission time interval (less than 7 OFDM symbols, such as, 2 or 3 OFDM symbols), for example, the subframe of the main carrier can be divided into sTTIs of 2 or 3 OFDM symbols.
  • the sTTI of 7 OFDM symbols can also be used to perform subframes of the main carrier Division, or alternatively, sTTIs of other lengths can also be used to divide the subframes.
  • the embodiment of the present application does not specifically limit the scheduling unit of the FDD carrier.
  • the timing relationship is a timing relationship: when the terminal receives the downlink information transmitted through the first sTTI, the terminal The second sTTI transmits feedback information of the downlink information.
  • This timing relationship may be that when the base station sends downlink information to the terminal at the time T 0 through the first sTTI of the secondary carrier, and the terminal sends the second sTTI of the feedback information to the base station through the primary carrier, corresponding to T 0 +8 OFDM symbols At this moment, this embodiment of the present application does not limit this.
  • the secondary carrier when the secondary carrier is a TDD carrier, there is a smaller scheduling unit for the base station to transmit downlink information, that is, sTTI of 2 OFDM symbols and 3 OFDM Symbolic sTTI, when the base station transmits downlink information to the terminal device through 2 OFDM symbol sTTI and 3 OFDM symbol sTTI, it can balance the scheduling delay of the TDD carrier and the FDD carrier to a certain extent, and make full use of the uplink of the FDD carrier Feedback opportunities, thereby reducing the feedback bottleneck in the carrier aggregation system and reducing the air interface delay.
  • FIG. 5 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of the present application, including:
  • the terminal receives the downlink information through sTTIn in the downlink subframe of the secondary carrier.
  • sTTIn represents the sTTI with the index mark n
  • sTTIn is the N sTTIs contained in the M consecutive subframes in the carrier aggregation system.
  • the nth sTTI, M is an integer greater than 0, and N is an integer greater than M.
  • the primary carrier is an FDD carrier
  • the secondary carrier is a TDD carrier.
  • the number of OFDM symbols occupied by the sTTI of each subframe is 2 or 3, that is, the subframe of the TDD carrier is composed of sTTIs of 2 or 3 OFDM symbols.
  • the division mode of the subframes of the TDD carrier can be understood by referring to FIG. 3, and will not be repeated here.
  • the terminal receives the downlink information delivered by the base station through sTTIn in the downlink subframe of the secondary carrier, n is an index mark, and the M consecutive subframes of the TDD carrier in the carrier aggregation system include N sTTIs, and sTTIn is among the N sTTIs.
  • the nth sTTI is ranked according to the timing.
  • the downlink information in the embodiment of the present application may be information such as PDCCH, PDSCH, or specifically, may also be other types of information sent by the base station to the terminal, which is not specifically limited here.
  • the terminal sends feedback information on the downlink information through the sTTIm in the uplink subframe of the primary carrier, where sTTIm represents the sTTI with index index m, and sTTIm is the N sTTIs contained in M consecutive subframes in the carrier aggregation system
  • the mth sTTI is ranked according to the timing, and the value of m is the same as the index value of the sTTI used to transmit feedback information when the downlink information is delivered through the sTTIn in the downlink subframe of the primary carrier.
  • the main carrier in the embodiment of the present application is an FDD carrier, and the number of OFDM symbols occupied by the sTTI of each subframe is 2 or 3, that is, the subframe of the main carrier is composed of sTTIs of 2 or 3 OFDM symbols of.
  • the sTTI division pattern of the subframe of the main carrier may be ⁇ 3,2,2,2,2,3 ⁇ or ⁇ 2,3,2,2,2,3 ⁇ , optionally, it may be other
  • the division mode is not limited by the embodiment of the present application.
  • the M subframes corresponding to the secondary carrier and the primary carrier may be divided into the same number of sTTIs.
  • the terminal After receiving the downlink information delivered by the base station through sTTIn in the downlink subframe of the secondary carrier, the terminal sends feedback information on the downlink information through sTTIm in the uplink subframe of the primary carrier, m is an index mark, and the carrier aggregation system
  • the M consecutive subframes of the FDD carrier in the middle include N sTTIs, and sTTIm is the mth sTTI among the N sTTIs according to the timing.
  • the index labels of the secondary carrier and the primary carrier correspond to the same.
  • the downlink information transmitted by the primary carrier through its downlink also needs to transmit corresponding feedback information through its uplink, there is a timing relationship between the transmission of feedback information in its uplink and downlink, for example, through the The downlink information transmitted by sTTIn, the corresponding feedback information will be fed back in the uplink sTTIn+4. Therefore, the value of m may be the same as the index value of the sTTI used for transmitting feedback information when the downlink information is delivered through the sTTIn in the downlink subframe of the primary carrier.
  • the terminal sends feedback information for the downlink information to the base station through the sTTIm in the primary carrier, and the feedback information may be, for example, a HARQ message in response to the PDSCH scheduled by the PDCCH, the PDSCH of the SPS, or the PDCCH/EPDCCH indicating the release of the SPS , More specifically, it can be an ACK or NACK message.
  • the sTTIn in the secondary carrier carrying the downlink information and the sTTIm in the primary carrier carrying the feedback information corresponding to the downlink information that is, according to the timing relationship, when the base station passes the sTTIn delivers a downlink message to the terminal.
  • the terminal After receiving the downlink message, the terminal sends a feedback message to the base station through the sTTIm in the uplink subframe of the primary carrier.
  • the primary carrier is an FDD carrier
  • sTTI of 2/3 OFDM symbols is used as the scheduled transmission time interval
  • every 2/3 OFDM symbols can generate an opportunity to transmit uplink information
  • the secondary carrier is a TDD carrier
  • the sTTI of 2/3 OFDM symbols is used as the scheduled transmission time interval, which is largely balanced with the scheduled time interval of the primary carrier.
  • the feedback information generated by the downlink information transmitted through each sTTI of the secondary carrier can be fully utilized The transmission opportunity of the main carrier, so as to avoid the feedback bottleneck in the TDD-FDD carrier aggregation system and reduce the air interface delay.
  • FIG. 6 is a schematic diagram of an embodiment of a radio frame of a carrier aggregation system in an embodiment of this application.
  • the primary carrier in the carrier aggregation system in the embodiment of the present application is an FDD carrier 601, and the secondary carrier is a TDD carrier 602, where both the primary carrier and the secondary carrier use sTTI with a length of 2/3 OFDM symbols
  • the subframes are divided, and the number of sTTIs divided for each subframe of the primary carrier and the secondary carrier is six.
  • the length of one radio frame of the primary carrier and the secondary carrier in the embodiment of the present application is 10 ms, and each radio frame includes 10 subframes, and the length of each subframe is 1 ms.
  • the embodiment of the present application is an example of the present invention for a conventional subframe in the prior art, that is, a length of 1 ms, and the subframe in the carrier aggregation system may also have other lengths, which is not specifically limited here.
  • radio frame 6012 in the uplink of the main carrier only one radio frame 6012 in the uplink of the main carrier, one radio frame 6011 in the downlink corresponding thereto, and one radio frame 6021 of the TDD carrier are shown in the figure.
  • the letter “D” represents a downstream subframe
  • the letter “U” represents an upstream subframe
  • the letter “S” represents a special subframe.
  • the radio frame 6011 in FIG. 6 includes 10 downlink subframes
  • the radio frame 6012 includes 10 uplink subframes
  • the radio frame 6021 includes a total of 10 downlink subframes, uplink subframes, and special subframes.
  • the frame structure is "DSUDDDSUDD".
  • the wireless frame structure of the TDD carrier also includes six other frame structures. Please refer to Table 1 for details. It should be understood that FIG. 6 only shows a TDD frame structure to introduce the communication method in the embodiments of the present application. In the actual application process, other TDD frame structures are applicable, as shown in FIG. 6 The embodiment should not be regarded as a limitation of the communication method of the embodiment of the present application.
  • Each subframe in the primary carrier and the secondary carrier contains 6 sTTIs, and the length of each sTTI is 2 or 3 OFDM symbols, as shown in FIG. 6.
  • the sTTI division mode of the subframe of the main carrier may be ⁇ 3,2,2,2,2,3 ⁇ or ⁇ 2,3,2,2,2,3 ⁇ , optionally, it may be other
  • the division mode of the sub-frame of the secondary carrier can be understood by referring to FIG. 3, and will not be repeated here.
  • the embodiments of the present application also mark the sTTI in the three radio frames shown in the figure according to the timing. Specifically, the sorting result is indicated by an index mark, and one sTTI corresponds to a unique index mark, which is used to indicate The position of the sTTI in the carrier. As shown in FIG. 6, the number of sTTIs in radio frame 6011, radio frame 6012, and radio frame 6021 is the same, and each subframe in each radio frame and the sTTI in each subframe are complete and continuous, and can be used An index mark in digital form identifies the location of the sTTI.
  • the sTTI of each uplink subframe in radio frame 6012 is complete and continuous, and is located in the first sTTI in the first subframe.
  • the index mark can be 1, then the next 5 sTTIs are 2, 3, 4, 5, and 6 in the first sTTI of the second subframe, and the next 5 are 8, 9, and 10, respectively. 11,12,..., the index marks of the sTTI in the last subframe are 56,57,58,58,59,60 in sequence.
  • the sTTI in the radio frame 6011 and the radio frame 6021 can also adopt corresponding index marks.
  • other identification symbols may also be used to mark the position of each sTTI in a carrier, which is not specifically limited here.
  • the terminal receives the downlink information through the sTTI n of the secondary carrier, where n is the index mark of the sTTI, and the downlink information may be information such as PDCCH, PDSCH, or other types of information sent by the base station to the terminal. Do limit.
  • the terminal After receiving the downlink information through sTTI n , the terminal sends feedback information for the downlink information to the base station through the primary carrier, that is, sTTIm in the FDD carrier, and the feedback information may be, for example, in response to PDSCH scheduled by the PDCCH,
  • the PDSCH of the semi-statically scheduled SPS or the HARQ message indicating the PDCCH/EPDCCH released by the SPS more specifically, may be an ACK or NACK message.
  • the sTTI n in the secondary carrier carrying the downlink information and the sTTI m in the primary carrier carrying the feedback information corresponding to the downlink information that is, according to the timing relationship, when the base station downlinks subframes through the secondary carrier
  • the terminal After receiving the downlink message, the terminal sends a feedback message to the base station through the sTTI m in the uplink subframe of the primary carrier.
  • the communication method for the carrier aggregation system in the embodiment of the present application will be specifically described with the sTTI division structure of the radio frame shown in FIG. 6.
  • the sTTI in the uplink and downlink carriers of the main carrier itself has a timing relationship, as shown by the arrows in the figure, that is, the downlink information in the sTTI n in the downlink subframe of the main carrier
  • the feedback information is carried in the sTTI n+4 in the uplink subframe of the primary carrier.
  • the downlink information carried by the sTTI with the index number of the downlink subframe in the primary carrier is 1.
  • the terminal After receiving, the terminal will index through the uplink subframe.
  • the sTTI number 5 transmits the corresponding feedback information. Since the number of sTTIs included in the radio frame of the primary carrier and the secondary carrier is the same, after receiving the downlink message through the sTTI n of the secondary carrier, the terminal may also transmit the feedback message for the downlink message through the sTTI n+4 of the primary carrier.
  • the terminal feeds back through the sTTI n+4 in the uplink subframe of the primary carrier, for example, the downlink information delivered by the downlink subframe sTTI 0 of the secondary carrier
  • the terminal can also feed back through the sTTI 4 in the uplink subframe of the primary carrier.
  • the embodiment of the present application can also use other sTTI timing relationships to transmit feedback information to the received downlink information according to the actual situation in the actual application process.
  • An embodiment of the present application provides a communication method for a carrier aggregation system.
  • the primary carrier is an FDD carrier and the secondary carrier is a TDD carrier.
  • Both use sTTI pairs of subframes with a length of 2/3 OFDM symbols
  • the primary carrier can continuously generate opportunities to transmit uplink information every 2/3 OFDM symbols
  • the secondary carrier uses 2/3 OFDM symbols STTI is used as the scheduled transmission time interval, and the scheduled time interval with the primary carrier is largely balanced.
  • the feedback information generated by the downlink information transmitted through each sTTI of the secondary carrier can make full use of the transmission opportunities of the primary carrier, thereby Try to avoid the feedback bottleneck in the TDD-FDD carrier aggregation system and reduce the air interface delay.
  • the above communication scenario in which the primary carrier is an FDD carrier and the secondary carrier is a TDD carrier introduces the communication method in the embodiments of the present application.
  • the application will be implemented in a communication scenario in which the primary carrier is a TDD carrier and the secondary carrier is an FDD carrier
  • the communication method in the example is introduced.
  • FIG. 7 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of the present application, including:
  • the terminal device receives downlink information through the first sTTI of the secondary carrier.
  • the primary carrier is a TDD carrier
  • the secondary carrier is an FDD carrier.
  • the carrier aggregation system in the embodiment of the present application may further include other secondary carriers in addition to the FDD carrier, such as other TDD carriers or other FDD carriers.
  • the number of TDD carriers and FDD carriers in the embodiment of the present application No specific restrictions are made here.
  • the terminal device receives downlink information transmitted by the base station through the first sTTI of the secondary carrier.
  • the first sTTI in the embodiment of the present application refers to one of the multiple scheduling units into which the secondary carrier is divided in the communication process, and the scheduling unit here refers to the terminal device and the base station transmitting information on the secondary carrier Time interval
  • the scheduling unit in the secondary carrier may be a subframe (1ms) or a time slot (half subframe) or a shorter transmission time interval (less than 7 OFDM symbols, such as 2 or 3) OFDM symbols), for example, the subframe of the secondary carrier may be divided into sTTIs of 2 or 3 OFDM symbols.
  • the sTTI of 7 OFDM symbols may also be used to divide the subframe of the secondary carrier, or, Subframes may also be divided using sTTIs of other lengths.
  • the embodiment of the present application does not specifically limit the scheduling unit of the FDD carrier, that is, the first sTTI.
  • the terminal device sends feedback information for the downlink information through the second sTTI in the first subframe of the primary carrier.
  • the first subframe includes sTTIs occupying OFDM symbols 2 and 3.
  • the first sTTI is
  • the second sTTI has a timing relationship.
  • the terminal device after receiving the downlink information delivered by the base station through the first sTTI of the secondary carrier, the terminal device generates corresponding feedback information for the downlink information, and can occupy the sTTI with 2 or 3 OFDM symbols
  • the feedback information of the downlink information is transmitted, that is, the feedback information of the downlink information is transmitted through the second sTTI in the first subframe on the primary carrier.
  • the primary carrier in the embodiment of the present application has at least one first subframe.
  • the first subframe may be composed of P sTTIs occupying 2 OFDM symbols and 3 sTTIs occupying OFDM symbols, that is, the primary carrier
  • the timing relationship is a timing relationship: when the terminal receives the downlink information transmitted through the first sTTI, the terminal The second sTTI transmits feedback information of the downlink information.
  • This timing relationship may be that when the base station sends downlink information to the terminal at the time T 0 through the first sTTI of the secondary carrier, and the terminal sends the second sTTI of the feedback information to the base station through the primary carrier, corresponding to the time T 0 +8 OFDM This is not limited in the embodiments of the present application.
  • the primary carrier in the embodiment of the present application may partially include the above-mentioned first subframe, and may also include subframes of other sTTI division modes, for example, a subframe composed of two sTTIs of 7 OFDM symbols , Or include subframes that are not divided into smaller sTTIs, as the scheduling unit of the main carrier; in addition, all subframes in the main carrier in the embodiment of the present application may also be the first subframe, that is, the main carrier Each subframe of is divided into sTTI of 2/3 OFDM symbols, which is not limited in this embodiment of the present application.
  • the timing relationship is a timing relationship: when the terminal receives the downlink information transmitted through the first sTTI, the terminal The second sTTI transmits feedback information of the downlink information.
  • the primary carrier is the TDD carrier
  • there is a small scheduling unit for the terminal device to transmit feedback information to the base station that is, sTTI and 3 of 2 OFDM symbols STTI of OFDM symbols
  • the terminal equipment transmits feedback information to the base station through the sTTI of 2 OFDM symbols and the sTTI of 3 OFDM symbols
  • FIG. 8 is a schematic diagram of another embodiment of a communication method for a carrier aggregation system in an embodiment of the present application, including:
  • the terminal receives the downlink information through the sTTI n in the downlink subframe of the secondary carrier, where sTTI n represents the sTTI with index index n, and sTTI n is N contained in M consecutive subframes in the carrier aggregation system
  • sTTI the nth sTTI according to the timing sequence
  • M is an integer greater than
  • N is an integer greater than M.
  • the carrier aggregation system in the embodiment of the present application is a carrier aggregation system where the primary carrier is a TDD carrier and the secondary carrier is an FDD carrier.
  • the number of OFDM symbols occupied by the sTTI of each subframe is 2 or 3, that is, the subframe of the secondary carrier is composed of sTTIs of 2 or 3 OFDM symbols.
  • the sTTI division pattern of the subframe of the secondary carrier may be ⁇ 3,2,2,2,2,3 ⁇ or ⁇ 2,3,2,2,2,3 ⁇ , optionally, it may be other
  • the division mode is not limited by the embodiment of the present application.
  • the M subframes corresponding to the primary carrier and the secondary carrier may be divided into the same number of sTTIs.
  • the terminal receives the downlink information delivered by the base station through sTTI n in the downlink subframe of the secondary carrier, where n is an index mark, and the M consecutive subframes of the secondary carrier in the carrier aggregation system include N sTTIs, and sTTI n is the N In the sTTI, the nth sTTI is ranked according to the timing.
  • the downlink information in the embodiment of the present application may be information such as PDCCH, PDSCH, or specifically, other types of information sent by the base station to the terminal device, which is not specifically limited here.
  • the terminal sends feedback information for the downlink information through the sTTI m in the uplink subframe of the primary carrier.
  • sTTI m represents the sTTI with index index m
  • sTTI m is the N contained in M consecutive subframes in the carrier aggregation system
  • the mth sTTI is ranked according to the timing, and the value of m is the same as the index value of the sTTI used to transmit feedback information when the downlink information is delivered through the sTTI n in the downlink subframe of the primary carrier.
  • the number of OFDM symbols occupied by the sTTI of each subframe is 2 or 3, that is, the subframe of the main carrier is composed of sTTIs of 2 or 3 OFDM symbols.
  • the division mode of the subframe of the main carrier can be understood by referring to FIG. 3, and details are not described here.
  • the terminal After receiving the downlink information delivered by the base station through the sTTI n in the downlink subframe of the secondary carrier, the terminal sends feedback information on the downlink information through sTTI m in the uplink subframe of the primary carrier, where m is the index mark, and the carrier
  • the M consecutive subframes of the main carrier in the aggregation system include N sTTIs, and sTTI m is the m- th sTTI among the N sTTIs that is ranked according to the timing.
  • the index marks of the primary carrier and the secondary carrier correspond to the same.
  • the downlink information transmitted by the primary carrier through its downlink also needs to transmit corresponding feedback information through its uplink, there is a timing relationship between the transmission of the feedback information in the uplink and downlink, for example, the downlink
  • the corresponding feedback information will be fed back in the sTTI n+ k of its uplink subframe, where the k value is an integer greater than 0, and one factor that determines the k value is the uplink and downlink of the TDD carrier Matching ratio, the uplink and downlink matching ratio of TDD carrier can be seen in Table 1.
  • the value of m in the primary carrier may be the same as the index value of the sTTI used to transmit feedback information when the downlink information is delivered through the sTTI n in the downlink subframe of the secondary carrier.
  • the secondary carrier when the secondary carrier is an FDD carrier, the sTTI of 2/3 OFDM symbols is used as the scheduled transmission time interval, then every 2/3 OFDM symbols will transmit a downlink message, the primary carrier
  • the sTTI of 2/3 OFDM symbols when used as the scheduled transmission time interval for the TDD carrier, each uplink subframe can provide more feedback opportunities, and the scheduling time interval between the primary carrier and the secondary carrier is largely balanced so that The feedback information generated by the downlink information transmitted through each sTTI of the secondary carrier can be transmitted to the base station in time, so as to avoid the feedback bottleneck in the TDD-FDD carrier aggregation system and reduce the air interface delay.
  • FIG. 9 is a schematic diagram of another embodiment of a radio frame of a carrier aggregation system in an embodiment of the present application.
  • the primary carrier in the carrier aggregation system in the embodiment of the present application is a TDD carrier 901
  • the secondary carrier is an FDD carrier 902.
  • Both the secondary carrier and the primary carrier use sTTIs with a length of 2/3 OFDM symbols to divide the subframes, and the number of sTTIs divided for each subframe of the secondary carrier and the primary carrier is six.
  • the length of one radio frame of the FDD carrier and the TDD carrier in the embodiment of the present application is 10 ms, and each radio frame includes 10 subframes, and the length of each subframe is 1 ms.
  • the embodiment of the present application is an example of the present invention for a conventional subframe in the prior art, that is, a length of 1 ms, and the subframe in the carrier aggregation system may also have other lengths, which is not specifically limited here.
  • radio frame 9011 of the TDD carrier For ease of explanation, only one radio frame 9011 of the TDD carrier, one radio frame 9021 in the downlink of the FDD carrier, and one radio frame 9022 in the downlink corresponding thereto are shown in the figure.
  • the letter “D” represents a downstream subframe
  • the letter “U” represents an upstream subframe
  • the letter “S” represents a special subframe.
  • the radio frame 9021 in FIG. 9 includes 10 downlink subframes
  • the radio frame 9022 includes 10 uplink subframes
  • the radio frame 9011 includes a total of 10 downlink subframes, uplink subframes, and special subframes.
  • the frame structure is "DSUDDDSUDD".
  • the wireless frame structure of the TDD carrier also includes six other frame structures. Please refer to Table 1 for details. It should be understood that FIG. 9 only shows a TDD frame structure to introduce the communication method in the embodiments of the present application. In practical applications, other TDD frame structures are applicable, as shown in FIG. 9 The embodiment should not be regarded as a limitation of the communication method of the embodiment of the present application.
  • Each subframe in the primary carrier and the secondary carrier contains 6 sTTIs, and the length of each sTTI is 2 or 3 OFDM symbols, as shown in FIG. 9.
  • the sTTI division mode of the subframe of the secondary carrier may be ⁇ 3,2,2,2,2,3 ⁇ or ⁇ 2,3,2,2,2,3 ⁇ , optionally, it may be other
  • the division mode of the sub-frame of the primary carrier can be understood by referring to FIG. 3, and will not be repeated here.
  • the embodiments of the present application also mark the sTTI in the three radio frames shown in the figure according to the timing. Specifically, the sorting result is indicated by an index mark, and one sTTI corresponds to a unique index mark, which is used to indicate The position of the sTTI in the carrier. As shown in FIG. 9, the number of sTTIs in radio frame 9021, radio frame 9022, and radio frame 9011 are the same, and each subframe in each radio frame and the sTTI in each subframe are complete and continuous, and can be used An index mark in digital form identifies the location of the sTTI.
  • the sTTI of each downlink subframe in the radio frame 9021 is complete and continuous, and is located in the first sTTI in the first subframe.
  • the index mark can be 1, then the next 5 sTTIs are 2, 3, 4, 5, 6, the first sTTI in the second subframe is 7, and the next 5 are 8, 9, 10 ,11,12,..., the index marks of the sTTI in the last subframe are 56,57,58,58,59,60 in sequence.
  • the sTTI in the radio frame 9022 and the radio frame 9011 may also adopt corresponding index marks.
  • other identification symbols may also be used to mark the position of each sTTI in a carrier, which is not specifically limited here.
  • the communication method for the carrier aggregation system in the embodiment of the present application is introduced with the sTTI structure of the radio frame shown in FIG. 9: the terminal receives downlink information through the sTTI n of the secondary carrier, where n is the index mark of the sTTI,
  • the downlink information may be PDCCH, PDSCH and other information, specifically, it may also be other types of information sent by the base station to the terminal, which is not specifically limited here.
  • the terminal After receiving the downlink information through sTTI n , the terminal sends feedback information for the downlink information to the base station through sTTI m in the primary carrier.
  • the feedback information may be, for example, in response to PDSCH scheduled by the PDCCH, semi-static scheduling
  • the PDSCH of the SPS or the HARQ message indicating the PDCCH/EPDCCH released by the SPS may be an ACK or NACK message.
  • there is a timing relationship between the sTTI n in the secondary carrier carrying the downlink information and the sTTI m in the primary carrier carrying the feedback information corresponding to the downlink information that is, according to the timing relationship, when the base station downlinks subframes through the secondary carrier
  • the sTTI n in sends a downlink message to the terminal.
  • the terminal After receiving the downlink message, the terminal sends a feedback message to the base station through the sTTI m in the uplink subframe of the primary carrier.
  • the main uplink and downlink carriers STTI carrier itself there is a relationship between the timing, downlink feedback information uplink subframe information, i.e. downlink sub-frame of the primary carrier sTTI n primary carrier is carried in sTTI n +k .
  • the primary carrier is a TDD carrier
  • the secondary carrier is an FDD carrier
  • each subframe is divided by an sTTI with a length of 2/3 OFDM symbols, and each subframe of the secondary carrier and the primary carrier
  • the number of divided sTTIs is 6, and the secondary carrier as the secondary carrier uses 2/3 OFDM symbols of the sTTI as the scheduled transmission time interval, then every 2/3 OFDM symbols will transmit a downlink message, and the primary carrier uses 2/3
  • the sTTI of OFDM symbols is used as the scheduled transmission time interval, then each uplink subframe can provide more feedback opportunities, and the scheduling time interval of the primary carrier and the secondary carrier is largely balanced, so that each sTTI via the secondary carrier
  • the feedback information generated by the transmitted downlink information can be transmitted to the base station in time, so as to avoid the feedback bottleneck in the TDD-FDD carrier aggregation system and reduce the air interface delay.
  • the above describes the communication method for the carrier aggregation system in the embodiments of the present application.
  • the terminal device and the network device for the carrier aggregation system in the embodiments of the present application will be described.
  • the communication device 10 is a schematic diagram of a communication device 10 provided by an embodiment of the present application.
  • the communication device 10 is used for a carrier aggregation system of FDD carriers and TDD carriers.
  • the communication device 10 includes:
  • the receiving unit 1001 is configured to receive downlink information through a secondary carrier
  • the sending unit 1002 is configured to send feedback information on the downlink information received by the receiving unit 1001 through a primary carrier.
  • the primary carrier or the secondary carrier is the TDD carrier
  • at least one of the TDD carriers There is a first subframe, the first subframe includes P consecutive short transmission time intervals sTTI, at least one of the P sTTIs occupies 2 orthogonal frequency division multiplexing OFDM symbols sTTI, the P It is an integer greater than 1.
  • the carrier aggregation system when the primary carrier is a TDD carrier with a minimum scheduling unit of 2 OFDM symbols sTTI, the carrier aggregation system has more feedback opportunities, and the communication device can use more feedback opportunities to feed back the downlink information on the FDD carrier
  • the secondary carrier is a TDD carrier with a minimum scheduling unit of 2 OFDM symbols sTTI
  • the carrier aggregation system has a smaller scheduling unit for transmitting downlink information, and the communication device can pass the smaller scheduling unit of the TDD carrier, such as 2
  • the OFDM symbol sTTI receives downlink information and makes full use of the feedback opportunities on the FDD carrier, thereby reducing the feedback bottleneck in the carrier aggregation system and reducing the air interface delay in the communication process.
  • the receiving unit 1001 is configured to receive downlink information through the first sTTI in the first subframe of the secondary carrier when the secondary carrier is a TDD carrier and the primary carrier is an FDD carrier.
  • the first subframe includes an sTTI occupying the number of OFDM symbols of 2 and an sTTI occupying the number of OFDM symbols of 3;
  • the sending unit 1002 is configured to send the second sTTI through the main carrier for the receiving unit to receive In the feedback information of the downlink information, there is a timing relationship between the second sTTI and the first sTTI.
  • the receiving unit 1001 is used when the secondary carrier is a TDD carrier and the primary carrier is an FDD carrier, and each subframe of the secondary carrier is the first subframe, the first subframe
  • the frame includes an sTTI occupying 2 OFDM symbols and an sTTI occupying 3 OFDM symbols, and each subframe of the main carrier is composed of an sTTI occupying 2 OFDM symbols and a number occupying 3 OFDM symbols.
  • the downlink information is received through the sTTI n in the downlink subframe of the secondary carrier, where the sTTI n represents the sTTI with index index n, and the sTTI n is M consecutive sub-systems in the carrier aggregation system
  • the nth sTTI is ranked according to the timing, the M is an integer greater than 0, and the N is an integer greater than M; correspondingly, the sending unit 1002 is used to pass the
  • the sTTI m in the uplink subframe of the primary carrier sends feedback information on the downlink information received by the receiving unit, the sTTI m represents the sTTI with index index m, and the sTTI m is M in the carrier aggregation system
  • the mth sTTI is ranked according to the timing, and the value of m corresponds to the time when the downlink information
  • the receiving unit 1001 is configured to receive downlink information through the first sTTI of the secondary carrier when the primary carrier is the TDD carrier and the secondary carrier is the FDD carrier
  • the sending unit is configured to send feedback information for the downlink information received by the receiving unit through the second sTTI in the first subframe of the primary carrier, the first sub The frame includes an sTTI occupying 2 OFDM symbols and an sTTI occupying 3 OFDM symbols.
  • the first sTTI and the second sTTI have a timing relationship.
  • the receiving unit 1001 is configured to, when the primary carrier is the TDD carrier and the secondary carrier is the FDD carrier, each subframe of the primary carrier is the first A subframe, the first subframe includes an sTTI occupying 2 OFDM symbols and an sTTI occupying 3 OFDM symbols, and each subframe of the secondary carrier is composed of an sTTI occupying 2 OFDM symbols When it is composed of sTTI occupying 3 OFDM symbols, the downlink information is received through sTTI n in the downlink subframe of the secondary carrier, where sTTI n represents sTTI with index mark n, and sTTI n is Among the N sTTIs contained in M consecutive subframes in the carrier aggregation system, the nth sTTI is ranked according to the timing, the M is an integer greater than 0, and the N is an integer greater than M; correspondingly,
  • the sending unit 1002 is configured to send feedback information about the downlink information received by the receiving unit through
  • receiving unit 1001 and the sending unit 1002 in the embodiments of the present application may be implemented by a transceiver or related circuit components of the transceiver.
  • an embodiment of the present application further provides a communication device 11, the communication device 11 includes a processor 1110, a memory 1120, and a transceiver 1130, where the memory 1120 stores instructions or programs, and the processor 1110 is used to execute Instructions or programs stored in the memory 1120.
  • the transceiver 1130 is used to perform the operations performed by the receiving unit 1001 and the sending unit 1002 in the foregoing embodiment.
  • the communication device 10 or the communication device 11 may correspond to the terminal device in the communication method for the carrier aggregation system of the embodiment of the present application, and each module in the communication device 10 or the communication device 11
  • the operations or functions are to implement the corresponding processes of the methods in FIGS. 2 to 9 respectively, and for the sake of brevity, they will not be repeated here.
  • the network device 12 is a schematic diagram of an embodiment of a network device 12 provided by an embodiment of the present application.
  • the network device 12 is used in a carrier aggregation system including an FDD carrier and a TDD carrier.
  • the network device 12 includes:
  • the sending unit 1201 is configured to send downlink information through a secondary carrier
  • the receiving unit 1202 is configured to receive feedback information for the downlink information sent by the sending unit 1201 through a primary carrier.
  • the primary carrier or the secondary carrier is the TDD carrier
  • at least one of the TDD carriers There is a first subframe, the first subframe includes P consecutive short transmission time intervals sTTI, at least one of the P sTTIs occupies 2 orthogonal frequency division multiplexing OFDM symbols sTTI, the P It is an integer greater than 1.
  • the carrier aggregation system when the secondary carrier is a TDD carrier with a minimum scheduling unit of 2 OFDM symbols sTTI, the carrier aggregation system has a smaller scheduling unit for transmitting downlink information, and the network device can use the smaller scheduling of the TDD carrier A unit, such as 2 OFDM symbols sTTI, sends downlink information to the terminal device.
  • the primary carrier is the TDD carrier with the minimum scheduling unit of 2 OFDM symbols sTTI
  • the carrier aggregation system has more opportunities for feedback and the communication device can receive The terminal equipment makes full use of the feedback information sent by the feedback opportunity on the FDD carrier, thereby reducing the feedback bottleneck in the carrier aggregation system and reducing the air interface delay in the communication process.
  • the sending unit 1201 is configured to pass the first subframe of the secondary carrier when the secondary carrier is the TDD carrier and the primary carrier is the FDD carrier
  • the first sTTI in sends downlink information.
  • the first subframe includes an sTTI occupying 2 OFDM symbols and an sTTI occupying 3 OFDM symbols;
  • the receiving unit 1202 is configured to pass
  • the second sTTI of the carrier receives feedback information for the downlink information sent by the sending unit 1201, and the second sTTI has a timing relationship with the first sTTI.
  • the sending unit 1201 is configured to: when the secondary carrier is the TDD carrier and the primary carrier is the FDD carrier, each subframe of the secondary carrier is the A first subframe, the first subframe includes an sTTI occupying 2 OFDM symbols and an sTTI occupying 3 OFDM symbols, and each subframe of the primary carrier is composed of 2
  • the downlink information is sent through the sTTI n in the downlink subframe of the secondary carrier
  • the sTTIn represents the sTTI with index index n
  • the sTTI n is In the N sTTIs contained in M consecutive subframes in the carrier aggregation system, the nth sTTI is ranked according to the timing, the M is an integer greater than 0, and the N is an integer greater than M; correspondingly, receiving Unit 1002, configured to receive feedback information for the downlink information sent by the sending unit 1001 through the sTTI
  • the sending unit 1201 is configured to send downlink information through the first sTTI of the secondary carrier when the primary carrier is the TDD carrier and the secondary carrier is the FDD carrier
  • the receiving unit 1202 is configured to receive feedback information for the downlink information sent by the sending unit 1201 through the second sTTI in the first subframe of the primary carrier, the first The subframe includes an sTTI occupying two OFDM symbols and an sTTI occupying three OFDM symbols.
  • the first sTTI and the second sTTI have a timing relationship.
  • the sending unit 1201 is configured to: when the primary carrier is the TDD carrier and the secondary carrier is the FDD carrier, each subframe of the primary carrier is the the first subframe, and each of said sub-frame by the secondary carrier as the number of OFDM symbols occupied by the number of OFDM symbols occupied STTI 2 and is constituted sTTI 3, a downlink sub-frame by the secondary carrier in sTTI n Sending the downlink information, the sTTI n represents the sTTI with index index n, and the sTTI n is the nth sTTI included in the M consecutive subframes in the carrier aggregation system in the nth position according to the timing sTTI, where M is an integer greater than 0, and N is an integer greater than M; correspondingly, the receiving unit 1202 is configured to receive and send to the sending unit through sTTI m in the uplink subframe of the primary carrier Feedback information of the downlink information, the sTTI m represents the sTT
  • the sending unit 1201 and the receiving unit 1202 in the embodiments of the present application may be implemented by a transceiver or a transceiver-related circuit component.
  • an embodiment of the present application further provides a network device 13, which includes a processor 1310, a memory 1320, and a transceiver 1330, where the memory 1320 stores instructions or programs, and the processor 1310 is used to The instructions or programs stored in the memory 1320 are executed.
  • the transceiver 1330 is used to perform the operations performed by the sending unit 1201 and the receiving unit 1202 in the above-described embodiment.
  • the network device 12 or the network device 13 may correspond to the network device in the communication method for the carrier aggregation system of the embodiment of the present application, and each module in the network device 12 or the network device 13
  • the operations or functions are to implement the corresponding processes of the methods in FIGS. 2 to 9 respectively, and for the sake of brevity, they will not be repeated here.
  • Embodiments of the present application also provide a computer-readable storage medium on which a computer program is stored.
  • a program related to a terminal device in the communication method for a carrier aggregation system provided by the foregoing method embodiments can be implemented. Process.
  • Embodiments of the present application also provide a computer-readable storage medium on which a computer program is stored.
  • a process related to a network device in the communication method for a carrier aggregation system provided by the foregoing method embodiment can be implemented.
  • An embodiment of the present application further provides a communication device, and the communication device may be a terminal device or a circuit.
  • the communication device may be used to perform the actions performed by the terminal device in the foregoing method embodiments.
  • FIG. 14 shows a simplified structural diagram of the terminal device. It is easy to understand and convenient to illustrate.
  • the terminal device uses a mobile phone as an example.
  • the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and input and output devices.
  • the processor is mainly used for processing communication protocols and communication data, as well as controlling terminal devices, executing software programs, and processing data of software programs.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input/output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit processes the baseband signal after radio frequency processing and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor.
  • the processor converts the baseband signal into data and processes the data.
  • FIG. 14 only one memory and processor are shown in FIG. 14. In actual terminal equipment products, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiments of the present application.
  • an antenna and a radio frequency circuit with a transceiver function can be regarded as a transceiver unit of a terminal device, and a processor with a processing function can be regarded as a processing unit of the terminal device.
  • the terminal device includes a transceiver unit 1410 and a processing unit 1420.
  • the transceiver unit may also be called a transceiver, a transceiver, a transceiver device, or the like.
  • the processing unit may also be called a processor, a processing board, a processing module, a processing device, and the like.
  • the device used to implement the receiving function in the transceiver unit 1410 can be regarded as a receiving unit, and the device used to implement the sending function in the transceiver unit 1410 can be regarded as a sending unit, that is, the transceiver unit 1410 includes a receiving unit and a sending unit.
  • the transceiver unit may sometimes be called a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may sometimes be referred to as a receiver, receiver, or receiving circuit.
  • the sending unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit. It should be understood that the transceiving unit 1410 is used to perform the sending operation and the receiving operation on the terminal device side in the foregoing method embodiments.
  • the chip When the communication device is a chip, the chip includes a transceiver unit and a processing unit.
  • the transceiver unit may be an input-output circuit and a communication interface;
  • the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip.
  • the communication device in this embodiment is a terminal device, refer to the device shown in FIG. 15.
  • the device can perform functions similar to the processor 1110 in FIG.
  • the device includes a processor 1510, a transmission data processor 1520, and a reception data processor 1530.
  • the receiving unit 1001 and the sending unit 1002 in the above embodiments may be the receiving data processor 1530 and the sending data processor 1520 in FIG. 15.
  • a channel encoder and a channel decoder are shown in FIG. 15, it can be understood that these modules do not constitute a restrictive description of this embodiment, but are only schematic.
  • FIG. 16 shows another form of this embodiment.
  • the processing device 1600 includes modules such as a modulation subsystem, a central processing subsystem, and peripheral subsystems.
  • the communication device in this embodiment can serve as the modulation subsystem therein.
  • the modulation subsystem may include a processor 1603 and an interface 1604.
  • the processor 1603 performs the functions of the processor 1110, and the interface 1604 performs the functions of the transceiver 1130.
  • the modulation subsystem includes a memory 1606, a processor 1603, and a program stored on the memory 1606 and executable on the processor. When the processor 1603 executes the program, the terminal device side in the above method embodiment is implemented. Methods.
  • the memory 1606 may be non-volatile or volatile, and its location may be located inside the modulation subsystem or the processing device 1600, as long as the memory 1606 can be connected to the The processor 1603 is sufficient.
  • a computer-readable storage medium on which instructions are stored, and when the instructions are executed, the method on the terminal device side in the foregoing method embodiment is executed.
  • a computer program product containing instructions is provided, and when the instructions are executed, the method on the terminal device side in the foregoing method embodiment is executed.
  • the network device in the embodiment of the present application may be as shown in FIG. 17.
  • the network device 1700 includes one or more radio frequency units, such as a remote radio unit (RRU) 1710 and one or more baseband units (BBU) ) (Also called digital unit, digital unit, DU) 1720.
  • the RRU 1710 may be called a transceiver unit, corresponding to the transceiver 1330 in FIG. 13, optionally, the transceiver unit may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1711 And RF unit 1712.
  • the RRU 1710 part is mainly used for the transmission and reception of radio frequency signals and the conversion of radio frequency signals and baseband signals, for example, for sending instruction information to terminal devices.
  • the BBU 1710 part is mainly used for baseband processing and controlling the base station.
  • the RRU 1710 and the BBU 1720 may be physically arranged together, or may be physically separated, that is, distributed base stations.
  • the BBU 1720 is the control center of the base station, and may also be referred to as a processing unit, which may correspond to the processor 1310 in FIG. 13 and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, and so on.
  • the BBU processing module
  • the BBU may be used to control the base station to perform the operation flow on the network device in the above method embodiment, for example, to generate the above indication information.
  • the BBU1720 may be composed of one or more boards, and the plurality of boards may jointly support a wireless access network of a single access standard (such as an LTE network), or may support wireless networks of different access standards respectively. Access network (such as LTE network, 5G network or other networks).
  • the BBU 1720 also includes a memory 1721 and a processor 1722.
  • the memory 1721 is used to store necessary instructions and data.
  • the processor 1722 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation flow of the network device in the foregoing method embodiment.
  • the memory 1721 and the processor 1722 may serve one or more single boards. In other words, the memory and processor can be set separately on each board. It is also possible that multiple boards share the same memory and processor. In addition, each board can also be equipped with necessary circuits.
  • processors mentioned in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general-purpose processors, digital signal processors (DSPs), and application specific integrated circuits ( application, specific integrated circuit (ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically Erasable programmable read only memory (Electrically, EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM DDR SDRAM
  • enhanced SDRAM ESDRAM
  • Synchlink DRAM SLDRAM
  • Direct Rambus RAM Direct Rambus RAM
  • the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component
  • the memory storage module
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请公开了一种用于载波聚合系统的通信方法，该载波聚合系统为包括TDD载波和FDD载波的载波聚合系统，包括：终端设备通过辅载波接收下行信息；终端设备通过主载波发送针对于该下行信息的反馈信息，当主载波或辅载波为TDD载波时，该TDD载波中至少存在一个包含P个连续的sTTI的第一子帧，P个sTTI中至少存在一个占用2个OFDM符号的sTTI，P为大于1的整数。本发明实施例还提供相应的终端设备和网路设备。本发明技术方案由于载波聚合系统中的TDD载波的最小调度单元为2个OFDM符号的sTTI，能够在一定程度上均衡TDD载波和FDD载波的调度时延，减少载波聚合系统中的反馈瓶颈，降低空口时延。

Description

一种用于载波聚合系统的通信方法、终端及网络设备
本申请要求于2018年12月17日提交中国专利局、申请号为201811544898.3、发明名称为“一种用于载波聚合系统的通信方法、终端及网络设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，具体涉及一种用于载波聚合系统的通信方法、终端及网络设备。
背景技术
随着移动通信业务需求的发展变化，国际电信同盟等多组织对未来移动通信系统都定义了更高的用户面时延性能要求。缩短用户时延性能的主要方法之一是降低传输时间间隔(transmission time interval,TTI)，即使用短传输时间间隔(short transmission time interval,sTTI)。针对sTTI的下行链路，一个子帧长度(1ms)内可以传输的sTTI的个数以及每个sTTI占用的正交频分复用(orthogonal frequency division multiplexin，OFDM)符号个数都需要重新设计。
3GPP Rel-15中指定的sTTI的标准规范，将长期演进(long term evolution,LTE)系统中的原本长度为1ms即一个子帧的调度TTI进行了缩短调整，具体为频分双工(frequency division duplex，FDD)系统的调度TTI由1ms缩短为最小sTTI可以采用2个OFDM符号，长度约为0.14ms；而时分双工(time division duplexing，TDD)系统的调度TTI则由1ms缩短为7个OFDM符号作为最小可以调度的sTTI，长度为0.5ms。现有的FDD载波的常规子帧(1ms)的sTTI占用的符号个数可以为2和3，其下行常规子帧的sTTI划分存在两种模式pattern，其中pattern1{3,2,2,2,2,3}应用于传统控制区域占用1个或3个OFDM符号的情况，而pattern2{2,3,2,2,2,3}应用于传统控制区域占用2个OFDM符号的情况。
在FDD和TDD的载波聚合系统中，当FDD作为主载波，TDD作为辅载波时，TDD的下行反馈承载于FDD载波。基于第三代合作伙伴计划(3rd generation partnership project，3GPP)Release-15中的标准规范，若FDD载波采用2/3个OFDM符号作为子帧的sTTI划分模式，TDD采用7个OFDM符号，FDD载波每2/3个OFDM符号便能产生一个上行反馈机会，而TDD载波的下行最小sTTI则为7个OFDM符号，无法充分利用FDD上行载波的每个反馈机会，反馈存在瓶颈。而当TDD载波作为主载波时，FDD载波的下行反馈承载于TDD载波，基于3GPP Rel-15中的标准规范，对于FDD载波采用2/3个OFDM符号，而TDD采用7个OFDM符号作为子帧的sTTI划分模式的情况，终端接收FDD载波每2/3个OFDM符号便可产生一个反馈信息，而TDD的每个上行子帧只能够提供两个反馈机会，反馈存在瓶颈。因此不论是上述哪种情况，反馈瓶颈的存在均导致了反馈信息的传输时延。
发明内容
本申请实施例提供一种用于载波聚合系统的通信方法，能够一定程度上避免TDD-FDD载波聚合系统中的反馈瓶颈，降低空口时延。本申请实施例还提供了相应的设备。
本申请第一方面提供一种用于载波聚合系统的通信方法，该载波聚合系统为包括时分双工TDD载波和频分双工FDD载波的载波聚合系统，该方法包括终端设备通过辅载波接收下行信息，该下行信息可以是由物理下行控制信道调度的如下行共享物理信道等信息；终端设备通过主载波发送针对于该下行信息的反馈信息，该反馈信息可以是混合自动重传消息等，当主载波或辅载波为TDD载波时，TDD载波中至少存在一个第一子帧，通常一个子帧中包含14个OFDM符号，该第一子帧包含P个连续的sTTI，即子帧中的14个OFDM符号被划分为P个传输时间间隔sTTI，每个sTTI可以包括相同或者不同数量的OFDM符号，该P个sTTI中至少存在一个占用2个OFDM符号的sTTI，P为大于1的整数，例如第一子帧被划分为7个sTTI，每个sTTI占用2个PFDM符号。
由该第一方面可知，该载波聚合系统中的TDD载波的最小调度单元为2个OFDM符号的sTTI，通过采用更小的传输时间间隔传输信息，能够在一定程度上均衡TDD载波和FDD载波的调度时延，当其作为主载波时，可以增加系统的反馈机会，当其作为辅载波时，能够充分利用系统的反馈机会，从而减少载波聚合系统中的反馈瓶颈，降低空口时延。
结合上述第一方面，在第一方面的第一种可能的实现方式中，所述第一子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI，例如第一子帧可以包括6个sTTI，该6个sTTI中可以包括四个占用2个PFDM符号的sTTI和两个占用3个OFDM符号的sTTI。
由上述第一方面第一种可能的实现方式可知，将第一子帧划分为2个OFDM符号的sTTI和3个OFDM符号的sTTI的组合，在考虑到对子帧进行sTTI划分时的半帧边界问题，这种划分方式可以最大程度的将子帧划分为更小的传输时间间隔，提供更多的传输信息的机会，在一定程度上均衡TDD载波和FDD载波的调度时延，减少反馈瓶颈，降低空口时延。
结合上述第一方面第一种可能的实现方式，在第二种可能的实现方式中，当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，所述终端设备通过辅载波接收下行信息，包括：所述终端设备通过所述辅载波的所述第一子帧中的第一sTTI接收下行信息，所述第一sTTI为所述P个sTTI中的一个；对应地，所述终端设备通过主载波发送针对于所述下行信息的反馈信息，包括：所述终端设备通过所述主载波的第二sTTI发送针对于所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
由上述第一方面第二种可能的实现方式可知，当TDD载波的最小调度单元被设置为2个OFDM符号的sTTI，且该TDD载波为辅载波，FDD载波为主载波时，终端设备可以通过更小的传输时间间隔传输下行信息，从而能够充分地利用FDD载波的上行反馈机会，从而降低载波聚合系统的空口时延。
结合上述第一方面第二种可能的实现方式，在第三种可能的实现方式中，当所述辅载波的每个子帧均为所述第一子帧，且所述主载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，所述终端设备通过所述辅载波的所述第一子帧的第一sTTI接收下行信息,包括：所述终端设备通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子 帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数，例如，该载波聚合系统中包含10个连续子帧，若每个子帧被划分为6个sTTI，则10个连续子帧包括60个sTTI，可以对60个sTTI按照按时序进行编号得到每个sTTI对应的索引标记，同一条链路的每个sTTI对应着唯一的一个索引标记；对应地，所述终端设备通过所述主载波的第二sTTI发送针对于所述下行信息的反馈信息，包括：所述终端设备通过所述主载波的上行子帧中的sTTI m发送针对所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
由上述第一方面第三种可能的实现方式可知，FDD载波作为主载波时，每2/3个OFDM符号便能产生一个传输上行信息的机会，作为辅载波的TDD载波采用2/3个OFDM符号的sTTI作为调度传输时间间隔时，载波聚合系统的相同数量的连续子帧中可以包含同样数量的sTTI，使得TDD载波与FDD载波在能够很大程度的保持调度时间间隔均衡，由于终端设备接收通过主载波下行链路的第n个sTTI下发的下行信息，是通过主载波的上行链路的第m个sTTI进行下行信息的反馈，因此通过辅载波中的第n个sTTI接收的下行信息，也可以按照主载波的定时关系，通过主载波上行链路的第m个sTTI进行该下行信息的反馈，从而可以保证载波聚合系统中信息传输的准确性。
结合上述第一方面第三种可能的实现方式，在第四种可能的实现方式中，m等于n+4，即辅载波的sTTI n上携带的下行信息，定时关系为从主载波的第n+4个sTTI进行反馈，4个sTTI的符号个数约为8～12个OFDM符号，可以保证终端设备能够具有充足的时间对接收到的下行信息进行解析，也能够使得反馈信息在尽可能短的时间内反馈给基站，从而在保证了信息传输的准确性，以及在一定程度上降低信息传输的空口时延。
结合上述第一方面第一种可能的实现方式，在第五种可能的实现方式中，当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，所述终端设备通过辅载波接收下行信息，包括：所述终端设备通过所述辅载波的第一sTTI接收下行信息；对应地，所述终端设备通过主载波发送针对于所述下行信息的反馈信息，包括：所述终端设备通过所述主载波的所述第一子帧中的第二sTTI发送针对于所述下行信息的反馈信息，所述第二sTTI为所述P个sTTI中的一个，所述第一sTTI与所述第二sTTI存在定时关系。
由上述第一方面第五种可能的实现方式可知，当FDD载波为辅载波，TDD载波作为主载波，最小调度单元被设置为2个OFDM符号的sTTI，从而可以提供更多的上行反馈机会，终端设备在接收到辅载波上的下行信息后，能够及时的通过主载波上的更多的反馈机会进行下行信息的反馈，从而降低载波聚合系统的空口时延。
结合上述第一方面第五种可能的实现方式，在第六种可能的实现方式中，当所述主载波的每个子帧均为所述第一子帧，且所述辅载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，所述终端设备通过所述辅载波的第二sTTI接收下行信息,包括：所述终端设备通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N 个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；对应地，所述终端设备通过所述主载波的所述第一子帧的第一sTTI发送针对于所述下行信息的反馈信息，包括：所述终端设备通过所述主载波的上行子帧中的sTTI m发送针对所述下行信息的反馈信息，所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
由上述第一方面第六种可能的实现方式可知，辅载波为FDD载波，每2/3个OFDM符号便能传输一个下行信息到终端设备，主载波为TDD载波时采用2/3个OFDM符号的sTTI作为调度传输时间间隔时，载波聚合系统相同数量子帧中可以包含同样数量的sTTI，使得TDD载波与FDD载波在能够很大程度的保持调度时间间隔均衡，由于通过主载波下行链路的第n个sTTI可以是通过其上行链路中的第m个sTTI进行下行信息的反馈，因此终端设备通过辅载波中的第n个sTTI接收的下行信息，也可以按照主载波的定时关系，通过主载波上行链路的第m个sTTI进行该下行信息的反馈，从而保证信息传输的准确性。
结合上述第一方面第六种可能的实现方式，在第七种可能的实现方式中，所述m等于n+k，所述k为大于3的整数，即第n个sTTI携带的下行信息，定时关系为从TDD载波的第n+k个sTTI进行反馈，3个以上sTTI包含的OFDM符号大于等于8个，从而可以保证终端设备能够具有充足的时间对接收到的下行信息进行解析，也能够使得反馈信息在尽可能短的时间内反馈给基站，从而在保证信息传输具备准确性的基础上，能够降低空口时延。
结合上述第一方面、第一方面第一种至第七种中任意一种可能的实现方式，在第八种可能的实现方式中，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为3，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
结合上述第一方面、第一方面第一种至第七种中任意一种可能的实现方式，在第九种可能的实现方式中，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为1或2，所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为2,3,2,2,2,3或者2,2,3,2,2,3。
结合上述第一方面、第一方面第一种至第七种中任意一种可能的实现方式，在第十种可能的实现方式中，若所述第一子帧为上行子帧，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
本申请第二方面提供一种用于载波聚合系统的通信方法，所述载波聚合系统为包括时分双工TDD载波和频分双工FDD载波的载波聚合系统，所述方法包括：基站通过辅载波发送下行信息；所述基站通过主载波接收针对于所述下行信息的反馈信息，当所述主载波或所述辅载波为所述TDD载波时，所述TDD载波中至少存在一个第一子帧，所述第一子帧包含P个连续的短传输时间间隔sTTI，所述P个sTTI中至少存在一个占用2个正交频分复用OFDM符号的sTTI，所述P为大于1的整数。
结合上述第二方面，在第一种可能的实现方式中，所述第一子帧包括所述占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI。
结合上述第二方面第一种可能的实现方式，在第二种可能的实现方式中，当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，所述基站通过辅载波发送下行信息，包括：所述基站通过所述辅载波的所述第一子帧中的第一sTTI发送下行信息；对应地，所述基站通过主载波接收针对于所述下行信息的反馈信息，包括：所述基站通过所述主载波的第二sTTI接收针对于所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
结合上述第二方面第二种可能的实现方式，在第三种可能的实现方式中，当所述辅载波的每个子帧均为所述第一子帧，且所述主载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，所述基站通过所述辅载波的所述第一子帧的第一sTTI发送下行信息,包括：所述基站通过所述辅载波的下行子帧中的sTTI n发送所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；对应地，所述基站通过所述主载波的第二sTTI接收针对于所述下行信息的反馈信息，包括：所述基站通过所述主载波的上行子帧中的sTTI m接收针对所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
结合上述第二方面第三种可能的实现方式，在第四种可能的实现方式中，所述m等于n+4。
结合上述第二方面第一种可能的实现方式，在第五种可能的实现方式中，当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，所述基站通过辅载波发送下行信息，包括：所述基站通过所述辅载波的第一sTTI发送下行信息；对应地，所述基站通过主载波接收针对于所述下行信息的反馈信息，包括：所述基站通过所述主载波的所述第一子帧中的第二sTTI接收针对于所述下行信息的反馈信息，所述第一sTTI与所述第二sTTI存在定时关系。
结合上述第二方面第五种可能的实现方式，在第六种可能的实现方式中，当所述主载波的每个子帧均为所述第一子帧，且所述辅载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，所述基站通过所述辅载波的第二sTTI发送下行信息,包括：所述基站通过所述辅载波的下行子帧中的sTTI n发送所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；对应地，所述基站通过所述主载波的所述第一子帧的第一sTTI接收针对于所述下行信息的反馈信息，包括：所述基站通过所述主载波的上行子帧中的sTTI m接收针对所述下行信息的反馈信息，所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
结合上述第二方面第六种可能的实现方式，在第七种可能的实现方式中，所述m等于 n+k，所述k为大于3的整数。
结合上述第二方面、第二方面第一种至第七种中任意一种可能的实现方式，在第八种可能的实现方式中，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为3，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
结合上述第二方面、第二方面第一种至第七种中任意一种可能的实现方式，在第九种可能的实现方式中，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为1或2，所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为2,3,2,2,2,3或者2,2,3,2,2,3。
结合上述第二方面、第二方面第一种至第七种中任意一种可能的实现方式，在第九种可能的实现方式中，若所述第一子帧为上行子帧，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
本申请本申请第三方面提供一种通信设备，所述通信设备用于执行上述第一方面或第一方面的任一可能的实现方式中的用于载波聚合系统的通信方法。具体地，所述终端设备可以包括用于执行第一方面或第一方面的任一可能的实现方式中的用于载波聚合系统的通信方法的模块。
本申请第四方面提供一种通信设备，所述终端设备包括存储器和处理器，所述存储器用于存储指令，所述处理器用于执行所述存储器存储的指令，并且对所述存储器中存储的指令的执行使得所述处理器执行第一方面或第一方面的任一可能的实现方式中的方法。
本申请第五方面提供一种计算机可读存储介质，其上存储有计算机程序，所述程序被处理器执行时实现第一方面或第一方面的任一可能的实现方式中的方法。
本申请第六方面提供一种网络设备，所述网络设备用于执行上述第二方面或第二方面的任一可能的实现方式中的用于载波聚合系统的通信方法。具体地，所述网络设备可以包括用于执行第二方面或第二方面的任一可能的实现方式中的用于载波聚合系统的通信方法的模块。
本申请第七方面提供一种网络设备，所述网络设备包括存储器和处理器，所述存储器用于存储指令，所述处理器用于执行所述存储器存储的指令，并且对所述存储器中存储的指令的执行使得所述处理器执行第二方面或第二方面的任一可能的实现方式中的方法。
本申请第八方面提供一种计算机可读存储介质，其上存储有计算机程序，所述程序被处理器执行时实现第二方面或第二方面的任一可能的实现方式中的方法。
本申请实施例采用一种用于载波聚合系统的通信方法，该载波聚合系统中的TDD载波的最小调度单元为2个OFDM符号的sTTI，通过采用更小的传输时间间隔传输信息，能够在一定程度上均衡载波聚合系统中TDD载波和FDD载波的调度时延，当其作为主载波时，能够增加系统的反馈机会，当其作为辅载波时，能够充分利用系统的反馈机会，从而减少载波聚合系统中的反馈瓶颈，降低空口时延。
附图说明
图1为本申请实施例中通信系统的一个实施例示意图；
图2为本申请实施例中的用于载波聚合系统的通信方法的一个实施例示意图；
图3为本申请实施例中TDD载波中第一子帧的sTTI划分模式的示意图；
图4为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图；
图5为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图；
图6为本申请实施例中的载波聚合系统的无线帧的一个实施例示意图；
图7为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图；
图8为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图；
图9是本申请实施例中的载波聚合系统的无线帧的另一个实施例示意图；
图10为本申请实施例提供的通信设备的实施例示意图；
图11为本申请实施例提供的通信设备的另一个实施例示意图；
图12为本申请实施例提供的网络设备的实施例示意图；
图13为本申请实施例提供的网络设备的另一个实施例示意图；
图14为本申请实施例提供的通信设备的另一个实施例示意图；
图15为本申请实施例提供的通信设备的另一个实施例示意图；
图16为本申请实施例提供的通信设备的另一个实施例示意图；
图17为本申请实施例提供的网络设备的另一个实施例示意图。
具体实施方式
本申请实施例采用一种用于载波聚合系统的通信方法，该载波聚合系统中的TDD载波的最小调度单元为2个OFDM符号的sTTI，通过采用更小的传输时间间隔传输信息，能够在一定程度上均衡TDD载波和FDD载波的调度时延，当其作为主载波时，能够增加系统的反馈机会，当其作为辅载波时，能够充分利用系统的反馈机会，从而减少载波聚合系统中的反馈瓶颈，降低空口时延。本发明实施例还提供相应的终端设备和网络设备。以下分别进行详细说明。
为了使本技术领域的人员更好地理解本申请方案，下面结合附图，对本发明的实施例进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本申请保护的范围。本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
应理解，本申请实施例的技术方案可以应用于长期演进(long term evolution，LTE)架构，还可以应用于通用移动通信系统(universal mobile telecommunications system，UMTS)陆地无线接入网(UMTS terrestrial radio access network，UTRAN)架构，或者全球移动通信系统(global system for mobile communication，GSM)/增强型数据速率 GSM演进(enhanced data rate for GSM evolution，EDGE)系统的无线接入网(GSM EDGE radio access network，GERAN)架构。在UTRAN架构或/GERAN架构中，MME的功能由服务通用分组无线业务(general packet radio service，GPRS)支持节点(serving GPRS support，SGSN)完成，SGW\PGW的功能由网关GPRS支持节点(gateway GPRS support node，GGSN)完成。本申请实施例的技术方案还可以应用于其他通信系统，例如公共陆地移动网络(public land mobile network，PLMN)系统，以及5G通信系统或5G之后的通信系统等，本申请实施例对此不作限定。
本申请实施例涉及终端设备。终端设备可以为包含无线收发功能、且可以与网络设备配合为用户提供通讯服务的设备。具体地，终端设备可以指用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。例如，终端设备可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital sssistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，5G网络或5G之后的网络中的终端设备等，本申请实施例对此不作限定。
本申请实施例还涉及网络设备。网络设备可以是用于与终端设备进行通信的设备，例如，可以是GSM系统或CDMA中的基站(base transceiver station，BTS)，也可以是WCDMA系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(evolutional node B，eNB或eNodeB)，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络或5G之后的网络中的网络侧设备或未来演进的PLMN网络中的网络设备等。
本申请实施例中涉及的网络设备也可称为无线接入网(radio access network，RAN)设备。RAN设备与终端设备连接，用于接收终端设备的数据并发送给核心网设备。RAN设备在不同通信系统中对应不同的设备，例如，在2G系统中对应基站与基站控制器，在3G系统中对应基站与无线网络控制器(radio network ontroller，RNC)，在4G系统中对应演进型基站(evolutional node B，eNB)，在5G系统中对应5G系统，如新无线接入系统(new radio access technology，NR)中的接入网设备(例如gNB，CU，DU)。
图1为本申请实施例中通信系统的一个实施例示意图。
网络设备和通信设备，该通信设备可以是终端设备，后文的实施例中以通信设备是终端设备为例进行描述，除了终端设备，本申请实施例中的通信设备也可以是电路，不应将其理解为只是终端设备。本申请实施例中的通信系统可以包括其他任何数量的终端设备、网络设备或其组合。图1中所示出的网络设备和通信设备这两个实体的网络设置仅仅被认为是本申请实施例的非限制性示例。
当代的无线系统利用基于包的传输，以3GPP LTE为例，终端在通过下行链路接收下行信息的数据包之后，向基站传输针对该下行信息的反馈信息，即混合自动重传请求(hybrid automatic repeat request，HARQ)消息。HARQ反馈在上行链路中进行，发送以响应于由物理下行控制信道(physical downlink control channel，PDCCH)调度的如下行共享物理信道(physical downlink shared channel，PDSCH)、半静态调度(semi-persistent  cheduling，SPS)的PDSCH或指示SPS释放的PDCCH或加强物理下行控制信道(enhanced physical downlink control channel，EPDCCH)等的信息。HARQ消息可以包括确认(acknowledgement,ACK)或非确认(negative acknowledgement，NACK)，可以使用的三个反馈状态：ACK、NACK、和非连续传输(discontinuous transmission，DTX)。成功的解码尝试导致ACK，而NACK在解码尝试不成功时发送，DTX指不连续传输，其在UE不接收任何PDSCH时发生，例如，错过接收发送的PDCCH/EPDCCH，或者不存在发送的PDCCH/EPDCCH或PDSCH时发生。本申请实施例中，术语下行、下行传输、下行链路、下行信息等可用于指示从网络设备到终端设备的传输。术语上行、上行传输、上行链路、上行信息等可用于相反方向的传输，即从终端设备到网络设备的传输。
现有技术中，在诸如高级LTE系统等某些接入技术中，通过在服务小区集上进行接收或者传输来执行载波聚合，其中服务小区包括至少一个下行分量载波，以及可能地，一个上行分量载波。此处，小区的概念可能不是指几何区域，而是应当视作逻辑概念。终端总是配置有主服务小区(primary cell，PCell)和辅服务小区(secondary cell,SCell)。需要说明的，PCell也可以用主载波(primary component carrier,PCC)的概念替代，对应地，SCell也可以被辅载波(secondary component carrier，SCC)的概念替代。物理上行控制信道(physical uplink control channel，PUCCH)总是在主载波上传输。一些实施例限定了一种用于TDD和FDD载波聚合的方法，用于在图1中的无线通信系统的主载波中的物理上行共享信道(physical uplink shared channel，PUSCH)上发送HARQ反馈。因此，本申请实施例中的载波聚合系统采用至少一个TDD载波和至少一个FDD载波，具体的数量在此不做限定。
对于下行的载波聚合，终端将在主载波上传输反馈信息，如高级LTE系统中在主载波的PUCCH中提供HARQ反馈，包括下行链路中接收到的下行信息所对应的ACK和NACK消息。现有技术中主要以子帧(例如，1ms，14个OFDM符号)或者子帧划分中更短的传输时间间隔TTI来布置数据传输，一组子帧可以构成无线帧(例如，10ms长)，一组TTI可以构成一个子帧(1ms)。因此，上行链路的子帧可用于发送对应于多个下行链路子帧的HARQ信息。因此，在FDD和TDD载波聚合中，如果TDD载波被配置为主载波，则FDD载波中的多个下行子帧或者多个下行TTI可以与TDD载波中的一个上行子帧或TTI相关联，指定携带用于FDD载波和TDD载波的HARQ反馈；如果FDD载波被配置为主载波，则TDD载波中的一个或多个下行子帧或TTI可以与FDD载波的一个上行子帧或TTI相关联。
更低的时延，更高的数据速率，一直都是LTE系统演进的目标。在LTE系统中，一个子帧在时域上的长度等于一个TTI周期，TTI是调度的最小单位，它直接决定着空中接口时延的大小。在通信过程中采用更短的传输时延sTTI可以有效降低终端和演进型节点的缓存需求，也可以提高无线资源的利用效率。因此，本申请实施例提供一种用于载波聚合系统的通信方法，该载波聚合系统中的TDD载波采用占用2个OFDM符号的sTTI作为最小的调度传输时间间隔，具体请参阅图2。
图2为本申请实施例中的用于载波聚合系统的通信方法的一个实施例示意图，包括：
201、终端通过辅载波接收下行信息。
本申请实施例中的载波聚合系统为包括FDD载波和TDD载波的载波聚合系统，该载波聚合系统中包括一个主载波和至少一个辅载波。当主载波为FDD载波，辅载波为一个TDD载波，需要说明的是，该载波聚合系统中还可以包含其他的除了该TDD载波的辅载波，例如其他的TDD载波或者其他的FDD载波。对应地，当主载波为TDD载波时，辅载波为一个FDD载波，该载波聚合系统也还可以包含除了该FDD载波的其他的辅载波，例如其他的FDD载波或者其他的TDD载波。本申请实施例中的载波聚合系统采用至少一个TDD载波和至少一个FDD载波，但TDD载波和FDD载波的具体的数量在此不做限定。
针对FDD载波和TDD载波的载波聚合系统，若主载波为FDD载波，辅载波为TDD载波，终端将通过该TDD载波的下行链路接收到基站传输的下行信息；当主载波为TDD载波，辅载波为FDD载波时，终端通过该FDD载波的下行链路接收基站传输的下行信息。
202、终端通过主载波发送针对于该下行信息的反馈信息，当主载波或辅载波为TDD载波时，该TDD载波中至少存在一个包含P个sTTI的第一子帧，其中，P个sTTI中至少存在一个占用2个OFDM符号的sTTI，P为大于1的整数。
本申请实施例中的载波聚合系统中，主载波可以是TDD载波，此时，辅载波为FDD载波；主载波也可以是FDD载波，此时，辅载波为TDD载波。TDD载波在通信过程中可以被划分为多个调度单元，此处的调度单元是指用于终端设备和基站传输信息的时间间隔，例如，TDD载波中的一个调度单元可以是一个子帧或者一个时隙(半个子帧的长度)等。本申请实施例中的TDD载波中包含至少一个第一子帧，该第一子帧被划分P个更小的用于传输信息的sTTI，每个sTTI都可以作为一个调度单元来传输基站或者终端设备需要发送的信息，其中，P个sTTI中至少存在一个sTTI的OFDM符号个数为2，这样，TDD载波便具有了非常小的传输时间间隔作为的调度单元，即2个OFDM符号的sTTI。一个常规子帧的长度为14个OFDM符号，14个OFDM符号为1ms，2个OFDM符号约为0.14ms。
本申请实施例中，在通过辅载波接收到基站发送的下行信息之后，终端设备针对该下行信息会产生相应的反馈信息，并且通过主载波的上行链路向基站传输该下行信息的反馈信息。本申请实施例中的反馈信息，是指终端根据接收到的下行信息后所产生的需要向基站进行传输的与该下行信息有关联的一种信息，例如一种针对于该下行信息的判断信息或者相关联的上行调度信息等，本申请实施例对下行信息以及相应的反馈信息的具体类型不做具体的限定。
本申请实施例中的载波聚合系统，可以采用2个或3个OFDM符号的sTTI来对FDD载波的子帧进行划分，可选地，也可以采用7个OFDM符号的sTTI对FDD载波的子帧进行划分，更或者，还可以采用其他长度的sTTI对子帧进行划分，本申请实施例对FDD载波的子帧的划分模式不做具体的限定。
本申请实施例采用一种用于载波聚合系统的通信方法，该载波聚合系统中的TDD载波的最小调度单元为2个OFDM符号的sTTI，通过采用更小的传输时间间隔传输信息，能够在一定程度上均衡TDD载波和FDD载波的调度时延，当其作为主载波时，能够增加系统的反馈机会，当其作为辅载波时，能够充分利用系统的反馈机会，从而减少载波聚合系统中的反馈瓶颈，降低空口时延。
基于上述的通信方法，本申请实施例还提供了TDD载波的子帧的sTTI划分方法，具体请参阅图3。
图3为本申请实施例中TDD载波中第一子帧的sTTI划分模式的示意图。
图3中示出了TDD载波中第一子帧的sTTI划分的三种结构301、302和303。由图3中可以看出，结构301是第一子帧的第一种划分模式，为{3,2,2,2,2,3}，结构302为第一子帧的第二种划分模式，为{2,3,2,2,2,3}，结构303为第一子帧的第三种划分模式，为{2,2,3,2,2,3}。这三种划分模式均适用于TDD载波的上行子帧和下行子帧的sTTI划分。
其中，对于TDD载波的下行子帧的sTTI划分，结构301适用于传统控制区域，例如3GPP LTE中的PDCCH，占3个OFDM符号的情况，结构302和结构303适用于传统控制区域，例如3GPP LTE中的PDCCH，占用1个或者2个OFDM符号的情况。
需要说明的是，图3中示出的第一子帧为长度为1ms常规子帧，包含14个OFDM符号，在实际应用过程中，TDD载波的子帧长度也有可能包含其他数量的OFDM符号是其他的长度。在某些场景和情况下，若载波聚合系统中的子帧包含其他数量的OFDM符号，依旧可以采用本申请实施例中2个或3个OFDM符号的sTTI或者两者的组合来对子帧进行结构划分的划分思路，本申请实施例对此不做具体的限定。
上述对本申请实施例中TDD载波的第一子帧的sTTI的划分方法作了介绍，接下来首先从主载波为FDD载波，辅载波为TDD载波的通信场景对本申请实施例中的通信方法进行介绍，具体请参阅图4-图6的相关介绍。
图4为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图，包括：
401、终端设备通过辅载波的第一子帧中的第一sTTI接收下行信息，该第一子帧包括占用OFDM符号为2和3的sTTI。
本申请实施例中的载波聚合系统中，主载波为FDD载波，辅载波为TDD载波。辅载波中至少存在一个包含P个sTTI的第一子帧，第一子帧可以是由P个占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成，即辅载波中至少存在一个被划分为占用2个OFDM符号和占用3个OFDM符号的sTTI的子帧。因此辅载波上存在较小的调度单元，即2个OFDM符号的sTTI和3个OFDM符号的sTTI，用于传输下行信息。需要说明的是，本申请实施例中的辅载波中可以部分地包括上述第一子帧，同时还可以包含其他sTTI划分模式的子帧，例如由两个7个OFDM符号的sTTI组成的子帧，或者包含不被划分为更小sTTI的子帧，作为辅载波的调度单元；除此之外，本申请实施例中的辅载波中的子帧也可以全部为第一子帧，即辅载波的每个子帧都被划分为2/3个OFDM符号的sTTI，本申请实施例对此不做限定。
本申请实施例中，终端设备可以接收基站通过所占用的OFDM符号个数为2或3的sTTI下发的下行信息，即该辅载波上的第一子帧中的第一sTTI发送的下行信息，该第一sTTI是第一子帧中P个sTTI中的一个。
需要说明的是，本申请实施例中的载波聚合系统还可以包含其他的除了该TDD载波的辅载波，例如其他的TDD载波或者其他的FDD载波，本申请实施例对TDD载波和FDD载波的数量在此不做具体的限定。
402、终端设备通过主载波的第二sTTI发送针对于所述下行信息的反馈信息，所述第 二sTTI与所述第一sTTI存在定时关系。
本申请实施例中，在接收基站通过占用OFDM符号个数为2或3的sTTI下发的下行信息后，终端设备针对该下行信息会产生相应的反馈信息，并且通过主载波的上行链路中的第二sTTI向基站传输该下行信息的反馈信息。
需要说明的是，本申请实施例中的第二sTTI是指主载波在通信过程中中被划分成的多个调度单元中的一个，此处的调度单元是指用于终端和基站在该主载波上传输信息的时间间隔，主载波中的调度单元可以是以一个子帧(1ms)或者一个时隙(7个PFDM符号)或者更短的传输时间间隔(少于7个OFDM符号,如，2个或3个OFDM符号)，例如，主载波的子帧可以被划分为2个或3个OFDM符号的sTTI，可选地，也可以采用7个OFDM符号的sTTI对主载波的子帧进行划分，更或者，还可以采用其他长度的sTTI对子帧进行划分，本申请实施例对FDD载波的调度单元不做具体的限定。
本申请实施例中，辅载波的第一sTTI和主载波的第二sTTI存在定时关系，该定时关系是一种时序关系：当终端接收通过第一sTTI传输的下行信息后，会在主载波的第二sTTI传输该下行信息的反馈信息。这种定时关系可以是，当基站在T 0时刻通过辅载波的第一sTTI向终端发送下行信息，终端通过主载波向基站发送反馈信息的第二sTTI，对应着T 0+8个OFDM符号的时刻，本申请实施例对此不做限定。
本申请实施例中，FDD载波和TDD载波的载波聚合系统中，辅载波为TDD载波时，存在用于基站向传输下行信息的较小的调度单元，即2个OFDM符号的sTTI和3个OFDM符号的sTTI，基站通过2个OFDM符号的sTTI和3个OFDM符号的sTTI向终端设备传输下行信息时，能够在一定程度上均衡TDD载波和FDD载波的调度时延，充分的利用FDD载波的上行反馈机会，从而减少载波聚合系统中的反馈瓶颈，降低空口时延。
图5为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图，包括：
501、终端通过辅载波的下行子帧中的sTTIn接收下行信息，sTTIn表示索引标记为n的sTTI，sTTIn为载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,M为大于0的整数，N为大于M的整数。
本申请实施例中的载波聚合系统中，主载波为FDD载波，辅载波为TDD载波。本申请实施例中的TDD载波，其每个子帧的sTTI所占用的OFDM符号个数为2个或者3个，即TDD载波的子帧是由2个或者3个OFDM符号的sTTI构成的。TDD载波的子帧的划分模式可以参阅图3进行理解，此处不再赘述。
终端接收基站通过辅载波的下行子帧中的sTTIn下发的下行信息，n为索引标记,该载波聚合系统中TDD载波的M个连续子帧内包含N个sTTI，sTTIn为这N个sTTI中按照时序排位在第n的sTTI。本申请实施例中的下行信息可以是PDCCH、PDSCH等信息，具体的，也可以是基站发送给终端的其他类型的信息，具体此处不做限定。
502、终端通过主载波的上行子帧中的sTTIm发送针对该下行信息的反馈信息，sTTIm表示索引标记为m的sTTI,sTTIm为载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,m的值与通过主载波的下行子帧中的sTTIn下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
本申请实施例中的主载波为FDD载波，其每个子帧的sTTI所占用的OFDM符号个数为2个或者3个，即主载波的子帧是由2个或者3个OFDM符号的sTTI构成的。例如，主载波的子帧的sTTI划分模式可以是{3,2,2,2,2,3}或者{2,3,2,2,2,3},可选地，也可以是其他的划分模式,本申请实施例对此不做限定。在载波聚合系统中的子帧的长度均相同的情况下，辅载波和主载波对应的M个子帧可以被划分为相同数目的sTTI。
终端在接收到基站通过辅载波的下行子帧中的sTTIn下发的下行信息后，通过主载波的上行子帧中的sTTIm发送针对该下行信息的反馈信息，m为索引标记，该载波聚合系统中FDD载波的M个连续子帧内包含N个sTTI,sTTIm为这N个sTTI中按照时序排位在第m的sTTI。本申请实施例中，由于辅载波和主载波对应的M个子帧可以被划分为相同数目的sTTI，因此辅载波和主载波的索引标记对应相同。由于主载波通过其下行链路传输的下行信息也需要通过其上行链路进行相应的反馈信息的传输，其上下行链路中的反馈信息的传输存在时序关系，例如，通过上行链路中的sTTIn传输的下行信息，对应的反馈信息将在上行链路的sTTIn+4进行反馈。因此m的值可以与通过主载波的下行子帧中的sTTIn下发下行信息时所对应的用于传输反馈信息的sTTI的索引值相同，例如,若通过主载波的下行子帧中的sTTIn下发下行信息时所对应的用于传输反馈信息的主载波的上行子帧中的sTTI的索引值为n+4，则：m＝n+4。可以理解的是，在实际应用过程中，也可以是其他的时序关系m＝n+r，r为大于0的整数，例如可以是m＝n+1或m＝n+6，具体此处不做限定。
终端通过主载波中的sTTIm，向基站发送针对于该下行信息的反馈信息，该反馈信息可以是，例如：响应于由PDCCH调度的PDSCH、SPS的PDSCH或指示SPS释放的PDCCH/EPDCCH的HARQ消息，更具体的，可以是ACK、或NACK消息。其中，承载该下行信息的辅载波中的sTTIn与承载对应于该下行信息的反馈信息的主载波中的sTTIm是存在时序关系的，即根据该时序关系，当基站通过辅载波下行子帧中的sTTIn向终端下发下行消息，终端在接收到该下行消息之后，会通过主载波的上行子帧中的sTTIm向基站发送反馈消息。
本申请实施例中，主载波为FDD载波时采用2/3个OFDM符号的sTTI作为调度传输时间间隔，则每2/3个OFDM符号便能产生一个传输上行信息的机会，辅载波为TDD载波采用2/3个OFDM符号的sTTI作为调度传输时间间隔，与主载波的调度时间间隔在很大程度上保持均衡，经由辅载波的每个sTTI传输的下行信息所产生的反馈信息，可以充分利用主载波的传输机会，从而尽量避免TDD-FDD载波聚合系统中的反馈瓶颈，降低空口时延。
图6为本申请实施例中的载波聚合系统的无线帧的一个实施例示意图。
如图6所示，本申请实施例中的载波聚合系统中的主载波为FDD载波601，辅载波为TDD载波602，其中，主载波和辅载波均采用长度为2/3个OFDM符号的sTTI对子帧进行划分，主载波和辅载波的每个子帧划分的sTTI的数目均为6。需要说明的是，本申请实施例中的主载波和辅载波的一个无线帧的长度均为10ms，且每个无线帧包括10个子帧，每个子帧的长度为1ms。可以理解的是，本申请实施例是针对现有技术中的常规子帧，即1ms长度进行本发明的举例，载波聚合系统中的子帧也有可能是其他的长度，具体此处不做限定。
为了便于说明，图中仅示出了主载波的上行链路中的一个无线帧6012、与其对应的下 行链路中的一个无线帧6011以及TDD载波的一个无线帧6021。图中，字母“D”表示一个下行子帧，字母“U”表示一个上行子帧，字母“S”表示特殊子帧。图6中的无线帧6011包括10个下行子帧，无线帧6012包括10个上行子帧，无线帧6021中包括总数目为10的下行子帧、上行子帧以及特殊子帧，其帧结构为“DSUDDDSUDD”。需要说明的是，TDD载波的无线帧结构除了“DSUDDDSUDD”的帧结构，还包括另外的六种帧结构，具体请参阅表1。应当理解的是，图6仅示出了一种TDD帧结构来对本申请实施例中的通信方法进行介绍，在实际应用过程中，其他的TDD帧结构均是适用的，图6中所示的实施例不应当被视为本申请实施例的通信方法的限制。
表1 3GPP定义的TDD上下行配比
Figure PCTCN2019121514-appb-000001
主载波和辅载波中的每个子帧均包含6个sTTI，每个sTTI的长度为2或3个OFDM符号，如图6所示。具体的，主载波的子帧的sTTI划分模式可以是{3,2,2,2,2,3}或者{2,3,2,2,2,3}，可选地，也可以是其他的划分模式，辅载波的子帧的划分模式可以参阅图3进行理解，此处不再赘述。
为了便于说明，本申请实施例还按照时序对图中所示出的三个无线帧中的sTTI进行了标记，具体的，排序结果采用索引标记表示，一个sTTI对应唯一一个索引标记，用于指示该sTTI在该载波中所处的位置。如图6所示，无线帧6011、无线帧6012和无线帧6021的sTTI数目是相同的，且每个无线帧中的每个子帧以及每个子帧中的sTTI均是完整且连续的，可以采用数字形式的索引标记来标识sTTI的位置。以无线帧6012为例来介绍本申请实施例中的索引标记，无线帧6012中的每个上行子帧的sTTI均是完整的且连续的，位于第一个子帧中的第一个sTTI的索引标记可以是1，则接下来的5个sTTI依次为2,3,4,5,6位于第二个子帧的第一个sTTI为7，接下来的5个依次为8,9,10,11,12，……，位于最后一个子帧的sTTI的索引标记依次为56,57,58,58,59,60。对应地，无线帧6011和无线帧6021中的sTTI也可以采用对应的索引标记。可选地，也可以采用其他的标识符号来标记每个sTTI在一个载波中所处的位置，具体此处不做限定。
终端通过辅载波的sTTI n接收下行信息，其中n是该sTTI的索引标记，下行信息可以是PDCCH、PDSCH等信息，具体的，也可以是基站发送给终端的其他类型的信息，具体此处不做限。在通过sTTI n接收到下行信息之后，终端通过主载波，即FDD载波中的sTTIm，向基站发送针对于该下行信息的反馈信息，该反馈信息可以是，例如：响应于由PDCCH调度的PDSCH、半静态调度SPS的PDSCH或指示SPS释放的PDCCH/EPDCCH的HARQ消息，更具 体的，可以是ACK、或NACK消息。其中，承载该下行信息的辅载波中的sTTI n与承载对应于该下行信息的反馈信息的主载波中的sTTI m是存在时序关系的，即根据该时序关系，当基站通过辅载波下行子帧中的sTTI n向终端下发下行消息，终端在接收到该下行消息之后，会通过主载波的上行子帧中的sTTI m向基站发送反馈消息。
以图6中所示出的无线帧的sTTI划分结构对本申请实施例中的用于载波聚合系统的通信方法进行具体介绍。由图6中可以看出，主载波的上下行载波中的sTTI本身存在一种时序关系，如图中的箭头所指示的时序关系，即主载波的下行子帧中的sTTI n中的下行信息的反馈信息承载于主载波的上行子帧中的sTTI n+4，例如主载波中下行子帧的索引编号为1的sTTI所承载的下行信息，终端在接收之后，将通过上行子帧中索引编号为5的sTTI传输对应的反馈信息。由于主载波和辅载波的无线帧中包含的sTTI的数量相同，那么终端通过辅载波的sTTI n接收下行消息后，也可以通过主载波的sTTI n+4传输针对于该下行消息的反馈消息。则通过辅载波的下行子帧sTTI n下发的下行信息的反馈信息，终端通过主载波的上行子帧中的sTTI n+4进行反馈，例如辅载波的下行子帧sTTI 0下发的下行信息的反馈信息，终端也可以通过主载波的上行子帧中的sTTI 4进行反馈。
可以理解的是，本申请实施例除了可以采用图6中示出的时序关系，在实际应用过程中，还可以根据实际的情况采用其他的sTTI时序关系针对接收到的下行信息进行反馈信息的传输，例如可以是m＝n+1或m＝n+2，也可以是m＝n+6，本申请实施例对此不做具体的限定。
本申请实施例提供了一种用于载波聚合系统的通信方法，该载波聚合系统中，主载波为FDD载波，辅载波为TDD载波，均采用长度为2/3个OFDM符号的sTTI对子帧进行划分，主载波和辅载波的每个子帧划分的sTTI的数目均为6，主载波每2/3个OFDM符号便能连续的产生传输上行信息的机会，辅载波采用2/3个OFDM符号的sTTI作为调度传输时间间隔，与主载波的调度时间间隔在很大程度上保持均衡，经由辅载波的每个sTTI传输的下行信息所产生的反馈信息，能够充分利用主载波的传输机会，从而尽量避免TDD-FDD载波聚合系统中的反馈瓶颈，降低空口时延。
上述从主载波为FDD载波，辅载波为TDD载波的通信场景对本申请实施例中的通信方法进行了介绍，接下来将从主载波为TDD载波，副载波为FDD载波的通信场景下对本申请实施例中的通信方法进行介绍，具体请参阅图7-图9的相关介绍。
图7为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图，包括：
701、终端设备通过辅载波的第一sTTI接收下行信息。
本申请实施例中的载波聚合系统中，主载波为TDD载波，辅载波为FDD载波。需要说明的是，本申请实施例中的载波聚合系统还可以包含其他的除了该FDD载波的辅载波，例如其他的TDD载波或者其他的FDD载波，本申请实施例对TDD载波和FDD载波的数量在此不做具体的限定。
本申请实施例中，终端设备接收基站通过辅载波的第一sTTI传输的下行信息。本申请实施例中的第一sTTI是指辅载波在通信过程中中被划分成的多个调度单元中的一个，此处的调度单元是指用于终端设备和基站在该辅载波上传输信息的时间间隔，辅载波中的调度单元可以是以一个子帧(1ms)或者一个时隙(半个子帧)或者更短的传输时间间隔(少于 7个OFDM符号,如，2个或3个OFDM符号)，例如，辅载波的子帧可以被划分为2个或3个OFDM符号的sTTI，可选地，也可以采用7个OFDM符号的sTTI对辅载波的子帧进行划分，更或者，还可以采用其他长度的sTTI对子帧进行划分，本申请实施例对FDD载波的调度单元，即第一sTTI不做具体的限定。
702、终端设备通过主载波的第一子帧中的第二sTTI发送针对于所述下行信息的反馈信息，该第一子帧包括占用OFDM符号为2和3的sTTI，所述第一sTTI与所述第二sTTI存在定时关系。
本申请实施例中，在接收基站通过辅载波的第一sTTI下发的下行信息后，终端设备针对该下行信息会产生相应的反馈信息，并且可以通过占用OFDM符号个数为2或3的sTTI传输该下行信息的反馈信息，即通过该主载波上的第一子帧中的第二sTTI传输该下行信息的反馈信息。本申请实施例中的主载波至少存在一个第一子帧，该第一子帧可以是由P个占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成，即主载波中至少存在一个被划分为占用2个OFDM符号和占用3个OFDM符号的sTTI的子帧。因此主载波上存在较小的调度单元，即2个OFDM符号的sTTI和3个OFDM符号的sTTI，用于传输反馈信息。
本申请实施例中，辅载波的第一sTTI和主载波的第二sTTI存在定时关系，该定时关系是一种时序关系：当终端接收通过第一sTTI传输的下行信息后，会在主载波的第二sTTI传输该下行信息的反馈信息。这种定时关系可以是，当基站在T 0时刻通过辅载波的第一sTTI向终端发送下行信息，终端通过主载波向基站发送反馈信息的第二sTTI，对应着T 0+8个OFDM的时刻，本申请实施例对此不做限定。
需要说明的是，本申请实施例中的主载波中可以部分地包括上述第一子帧，同时还可以包含其他sTTI划分模式的子帧，例如由两个7个OFDM符号的sTTI组成的子帧，或者包含不被划分为更小sTTI的子帧，作为主载波的调度单元；除此之外，本申请实施例中的主载波中的子帧也可以全部为第一子帧，即主载波的每个子帧都被划分为2/3个OFDM符号的sTTI，本申请实施例对此不做限定。
本申请实施例中，辅载波的第一sTTI和主载波的第二sTTI存在定时关系，该定时关系是一种时序关系：当终端接收通过第一sTTI传输的下行信息后，会在主载波的第二sTTI传输该下行信息的反馈信息。
本申请实施例中，FDD载波和TDD载波的载波聚合系统中，主载波为TDD载波时，存在用于终端设备向基站传输反馈信息的较小的调度单元，即2个OFDM符号的sTTI和3个OFDM符号的sTTI，终端设备通过2个OFDM符号的sTTI和3个OFDM符号的sTTI向基站传输反馈信息时，能够在一定程度上均衡TDD载波和FDD载波的调度时延，增加上行反馈机会，从而减少载波聚合系统中的反馈瓶颈，降低空口时延。
图8为本申请实施例中用于载波聚合系统的通信方法的另一个实施例示意图，包括：
801、终端通过辅载波的下行子帧中的sTTI n接收所述下行信息，sTTI n表示索引标记为n的sTTI，sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,M为大于0的整数，N为大于M的整数。
本申请实施例中的载波聚合系统为主载波为TDD载波，辅载波为FDD载波的载波聚合 系统。本申请实施例中的辅载波，其每个子帧的sTTI所占用的OFDM符号个数为2个或者3个，即辅载波的子帧是由2个或者3个OFDM符号的sTTI构成的。例如，辅载波的子帧的sTTI划分模式可以是{3,2,2,2,2,3}或者{2,3,2,2,2,3},可选地，也可以是其他的划分模式,本申请实施例对此不做限定。在载波聚合系统中的子帧的长度均相同的情况下，主载波和辅载波对应的M个子帧可以被划分为相同数目的sTTI。
终端接收基站通过辅载波的下行子帧中的sTTI n下发的下行信息，n为索引标记,该载波聚合系统中辅载波的M个连续子帧内包含N个sTTI，sTTI n为这N个sTTI中按照时序排位在第n的sTTI。本申请实施例中的下行信息可以是PDCCH、PDSCH等信息，具体的，也可以是基站发送给终端设备的其他类型的信息，具体此处不做限定。
802、终端通过主载波的上行子帧中的sTTI m发送针对该下行信息的反馈信息，sTTI m表示索引标记为m的sTTI,sTTI m为载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,m的值与通过主载波的下行子帧中的sTTI n下发下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
本申请实施例中的主载波，其每个子帧的sTTI所占用的OFDM符号个数为2个或者3个，即主载波的子帧是由2个或者3个OFDM符号的sTTI构成的。主载波的子帧的划分模式可以参阅图3进行理解，此处不再赘述。
终端在接收到基站通过辅载波的下行子帧中的sTTI n下发的下行信息后，通过主载波的上行子帧中的sTTI m发送针对该下行信息的反馈信息，m为索引标记，该载波聚合系统中主载波的M个连续子帧内包含N个sTTI,sTTI m为这N个sTTI中按照时序排位在第m的sTTI。本申请实施例中，由于主载波和辅载波对应的M个子帧可以被划分为相同数目的sTTI，因此主载波和辅载波的索引标记对应相同。由于主载波通过其下行链路传输的下行信息也需要通过其上行链路进行相应的反馈信息的传输，其上下行链路中的反馈信息的传输存在时序关系，例如，通过主载波的下行子帧中的sTTI n传输的下行信息，对应的反馈信息将在其上行子帧的sTTI n+k进行反馈，此处的k值为大于0的整数，决定k值的一个因素是TDD载波的上下行配比，TDD载波的上下行配比可见表1。因此主载波中m的值可以与通过辅载波的下行子帧中的sTTI n下发下行信息时所对应的用于传输反馈信息的sTTI的索引值相同，例如，若通过主载波的下行子帧中的sTTI n下发下行信息时所对应的用于传输反馈信息的主载波的上行子帧中的sTTI的索引值为n+k，则：m＝n+k。可以理解的是，在实际应用过程中，也可以是其他的时序关系，如m＝n+r，r为大于0的整数，例如可以是m＝n+1或m＝n+6，具体此处不做限定。
本申请实施例中，本申请实施例中，辅载波为FDD载波时采用2/3个OFDM符号的sTTI作为调度传输时间间隔，则每2/3个OFDM符号便会传输一个下行信息，主载波为TDD载波采用2/3个OFDM符号的sTTI作为调度传输时间间隔，则每个上行子帧能够提供更多的反馈机会，主载波和辅载波的调度时间间隔在很大程度上保持均衡，使得经由辅载波的每个sTTI传输的下行信息所产生的反馈信息能够及时的传输给基站，从而尽量避免TDD-FDD载波聚合系统中的反馈瓶颈，降低空口时延。
图9是本申请实施例中的载波聚合系统的无线帧的另一个实施例示意图。
如图9所示，本申请实施例中的载波聚合系统中的主载波为TDD载波901，辅载波为 FDD载波902。辅载波和主载波均采用长度为2/3个OFDM符号的sTTI对子帧进行划分，辅载波和主载波的每个子帧划分的sTTI的数目均为6。需要说明的是，本申请实施例中的FDD载波和TDD载波的一个无线帧的长度均为10ms，且每个无线帧包括10个子帧，每个子帧的长度为1ms。可以理解的是，本申请实施例是针对现有技术中的常规子帧，即1ms长度进行本发明的举例，载波聚合系统中的子帧也有可能是其他的长度，具体此处不做限定。
为了便于说明，图中仅示出了TDD载波的一个无线帧9011，FDD载波的下行链路中的一个无线帧9021、与其对应的下行链路中的一个无线帧9022。图中，字母“D”表示一个下行子帧，字母“U”表示一个上行子帧，字母“S”表示特殊子帧。图9中的无线帧9021包括10个下行子帧，无线帧9022包括10个上行子帧，无线帧9011中包括总数目为10的下行子帧、上行子帧以及特殊子帧，其帧结构为“DSUDDDSUDD”。需要说明的是，TDD载波的无线帧结构除了“DSUDDDSUDD”的帧结构，还包括另外的六种帧结构，具体请参阅表1。应当理解的是，图9仅示出了一种TDD帧结构来对本申请实施例中的通信方法进行介绍，在实际应用过程中，其他的TDD帧结构均是适用的，图9中所示的实施例不应当被视为本申请实施例的通信方法的限制。
主载波和辅载波中的每个子帧均包含6个sTTI，每个sTTI的长度为2或3个OFDM符号，如图9所示。具体的，辅载波的子帧的sTTI划分模式可以是{3,2,2,2,2,3}或者{2,3,2,2,2,3}，可选地，也可以是其他的划分模式，主载波的子帧的划分模式可以参阅图3进行理解，此处不再赘述。
为了便于说明，本申请实施例还按照时序对图中所示出的三个无线帧中的sTTI进行了标记，具体的，排序结果采用索引标记表示，一个sTTI对应唯一一个索引标记，用于指示该sTTI在该载波中所处的位置。如图9所示，无线帧9021、无线帧9022和无线帧9011的sTTI数目是相同的，且每个无线帧中的每个子帧以及每个子帧中的sTTI均是完整且连续的，可以采用数字形式的索引标记来标识sTTI的位置。以无线帧9021为例来介绍本申请实施例中的索引标记，无线帧9021中的每个下行子帧的sTTI均是完整的且连续的，位于第一个子帧中的第一个sTTI的索引标记可以是1，则接下来的5个sTTI依次为2,3,4,5,6，位于第二个子帧的第一个sTTI为7，接下来的5个依次为8,9,10,11,12，……，位于最后一个子帧的sTTI的索引标记依次为56,57,58,58,59,60。对应地，无线帧9022和无线帧9011中的sTTI也可以采用对应的索引标记。可选地，也可以采用其他的标识符号来标记每个sTTI在一个载波中所处的位置，具体此处不做限定。
以图9中所示出的无线帧的sTTI结构对本申请实施例中的用于载波聚合系统的通信方法进行介绍：终端通过辅载波的sTTI n接收下行信息，其中n是该sTTI的索引标记，下行信息可以是PDCCH、PDSCH等信息，具体的，也可以是基站发送给终端的其他类型的信息，具体此处不做限。在通过sTTI n接收到下行信息之后，终端通过主载波中的sTTI m，向基站发送针对于该下行信息的反馈信息，该反馈信息可以是，例如：响应于由PDCCH调度的PDSCH、半静态调度SPS的PDSCH或指示SPS释放的PDCCH/EPDCCH的HARQ消息，更具体的，可以是ACK、或NACK消息。其中，承载该下行信息的辅载波中的sTTI n与承载对应于该下行信息的反馈信息的主载波中的sTTI m是存在时序关系的，即根据该时序关系，当基站通过 辅载波下行子帧中的sTTI n向终端下发下行消息，终端在接收到该下行消息之后，会通过主载波的上行子帧中的sTTI m向基站发送反馈消息。图9中,主载波的上下行载波中的sTTI本身存在一种时序关系，即主载波的下行子帧中的sTTI n中的下行信息的反馈信息承载于主载波的上行子帧中的sTTI n+k。由于辅载波和主载波的无线帧中包含的sTTI的数量相同，那么终端通过辅载波的sTTI n接收下行消息后，也可以通过主载波的sTTI n+k传输针对于该下行消息的反馈消息，如图中的箭头所指示的时序关系，m＝n+k。可以理解的是，本申请实施例除了可以采用图9中示出的时序关系，在实际应用过程中，还可以根据实际的情况采用其他的sTTI时序关系针对接收到的下行信息进行反馈信息的传输，例如可以是m＝n+1或m＝n+2，也可以是m＝n+6，本申请实施例对此不做具体的限定。
本申请实施例中的载波聚合系统中，主载波为TDD载波，辅载波为FDD载波，均采用长度为2/3个OFDM符号的sTTI对子帧进行划分，辅载波和主载波的每个子帧划分的sTTI的数目均为6，辅载波作为辅载波采用2/3个OFDM符号的sTTI作为调度传输时间间隔，则每2/3个OFDM符号便会传输一个下行信息，主载波采用2/3个OFDM符号的sTTI作为调度传输时间间隔，则每个上行子帧能够提供更多的反馈机会，主载波和辅载波的调度时间间隔在很大程度上保持均衡，使得经由辅载波的每个sTTI传输的下行信息所产生的反馈信息能够及时的传输给基站，从而尽量避免TDD-FDD载波聚合系统中的反馈瓶颈，降低空口时延。
上述对本申请实施例中的用于载波聚合系统的通信方法进行了介绍，接下来将对本申请实施例中用于载波聚合系统的终端设备和网络设备。
图10为本申请实施例提供的通信设备10的示意图，所述通信设备10用于FDD载波和TDD载波的载波聚合系统，所述通信设备10包括：
接收单元1001，用于通过辅载波接收下行信息；
发送单元1002，用于通过主载波发送针对于所述接收单元1001接收的所述下行信息的反馈信息，当所述主载波或所述辅载波为所述TDD载波时，所述TDD载波中至少存在一个第一子帧，所述第一子帧包含P个连续的短传输时间间隔sTTI，所述P个sTTI中至少存在一个占用2个正交频分复用OFDM符号的sTTI，所述P为大于1的整数。
本申请实施例中，当主载波为最小调度单元是2个OFDM符号sTTI的TDD载波时，载波聚合系统具有了更多的反馈机会，通信设备能够利用更多的反馈机会反馈FDD载波上的下行信息，当辅载波为最小调度单元是2个OFDM符号sTTI的TDD载波时，载波聚合系统具有了更小的传输下行信息的调度单元，通信设备可以通过TDD载波的较小的调度单元，如2个OFDM符号sTTI，接收下行信息，并且充分利用FDD载波上的反馈机会，从而减少了载波聚合系统中的反馈瓶颈，降低通信过程中的空口时延。
可选地，作为一个实施例，该接收单元1001，用于在当辅载波为TDD载波，主载波为FDD载波时，通过辅载波的第一子帧中的第一sTTI接收下行信息，所述第一子帧包括占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI；对应地，该发送单元1002，用于通过主载波的第二sTTI发送针对于所述接收单元接收的所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
可选地，作为一个实施例，该接收单元1001，用于在当辅载波为TDD载波，主载波为 FDD载波，所述辅载波的每个子帧均为所述第一子帧，第一子帧包括占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI，且所述主载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；对应地，该发送单元1002，用于通过所述主载波的上行子帧中的sTTI m发送针对所述接收单元接收的所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
可选地，作为一个实施例，该接收单元1001，用于当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，通过所述辅载波的第一sTTI接收下行信息；对应地，所述发送单元，用于通过所述主载波的所述第一子帧中的第二sTTI发送针对于所述接收单元接收的所述下行信息的反馈信息，所述第一子帧包括占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI，所述第一sTTI与所述第二sTTI存在定时关系。
可选地，作为一个实施例，该接收单元1001，用于当所述主载波为所述TDD载波，所述辅载波为所述FDD载波，所述主载波的每个子帧均为所述第一子帧，所述第一子帧包括占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI，且所述辅载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；对应地，所述发送单元1002，用于通过所述主载波的上行子帧中的sTTI m发送针对所述接收单元接收的所述下行信息的反馈信息，所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
应理解，本申请实施例中的接收单元1001和发送单元1002可以由收发器或收发器相关电路组件实现。
如图11所示，本申请实施例还提供一种通信设备11，该通信设备11包括处理器1110，存储器1120与收发器1130，其中，存储器1120中存储指令或程序，处理器1110用于执行存储器1120中存储的指令或程序。存储器1120中存储的指令或程序被执行时，该收发器1130用于执行上述实施例中接收单元1001和发送单元1002执行的操作。
应理解，根据本申请实施例的通信设备10或通信设备11可对应于本申请实施例的用于载波聚合系统的通信方法中的终端设备，并且通信设备10或通信设备11中的各个模块的操作或功能分别为了实现图2至图9中的各个方法的相应流程，为了简洁，在此不再赘述。
图12为本申请实施例提供的网络设备12的实施例示意图，该网络设备12用于包括FDD载波和TDD载波的载波聚合系统，该网络设备12包括：
发送单元1201，用于通过辅载波发送下行信息；
接收单元1202，用于通过主载波接收针对于所述发送单元1201发送的所述下行信息的反馈信息，当所述主载波或所述辅载波为所述TDD载波时，所述TDD载波中至少存在一个第一子帧，所述第一子帧包含P个连续的短传输时间间隔sTTI，所述P个sTTI中至少存在一个占用2个正交频分复用OFDM符号的sTTI，所述P为大于1的整数。
本申请实施例中，当辅载波为最小调度单元是2个OFDM符号sTTI的TDD载波时，载波聚合系统具有了更小的传输下行信息的调度单元，网络设备可以通过TDD载波的较小的调度单元，如2个OFDM符号sTTI，向终端设备下发下行信息，当主载波为最小调度单元是2个OFDM符号sTTI的TDD载波时，载波聚合系统具有了更多的反馈机会，通信设备能够接收到终端设备充分利用FDD载波上的反馈机会发送来的反馈信息，从而减少了载波聚合系统中的反馈瓶颈，降低通信过程中的空口时延。
可选地，作为一个实施例，该发送单元1201，用于当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，通过所述辅载波的所述第一子帧中的第一sTTI发送下行信息，所述第一子帧包括占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI；对应地，该接收单元1202，用于通过所述主载波的第二sTTI接收针对于所述发送单元1201发送的所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
可选地，作为一个实施例，该发送单元1201，用于当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，所述辅载波的每个子帧均为所述第一子帧，所述第一子帧包括占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI，且所述主载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，通过所述辅载波的下行子帧中的sTTI n发送所述下行信息，所述sTTIn表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；对应地，接收单元1002，用于通过所述主载波的上行子帧中的sTTI m接收针对于所述发送单元1001发送的所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述FDD载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
可选地，作为一个实施例，该发送单元1201，用于当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，通过所述辅载波的第一sTTI发送下行信息；对应地，该接收单元1202，用于通过所述主载波的所述第一子帧中的第二sTTI接收针对于所述发送单元1201发送的所述下行信息的反馈信息，所述第一子帧包括占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI，所述第一sTTI与所述第二sTTI存在定时关系。
可选地，作为一个实施例，该发送单元1201，用于当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，所述主载波的每个子帧均为所述第一子帧，且所述辅载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，通过所述辅载波的下行子帧中的sTTI n发送所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI, 所述M为大于0的整数，所述N为大于M的整数；对应地，该接收单元1202，用于通过所述主载波的上行子帧中的sTTI m接收针对所述发送单元发送的所述下行信息的反馈信息，所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
应理解，本申请实施例中的发送单元1201和接收单元1202可以由收发器或收发器相关电路组件实现。
如图13所示，本申请实施例还提供一种网络设备13，该网络设备,13包括处理器1310，存储器1320与收发器1330，其中，存储器1320中存储指令或程序，处理器1310用于执行存储器1320中存储的指令或程序。存储器1320中存储的指令或程序被执行时，该收发器1330用于执行上述实施例中发送单元1201和接收单元1202执行的操作。
应理解，根据本申请实施例的网络设备12或网络设备13可对应于本申请实施例的用于载波聚合系统的通信方法中的网络设备，并且网络设备12或网络设备13中的各个模块的操作或功能分别为了实现图2至图9中的各个方法的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时可以实现上述方法实施例提供的用于载波聚合系统的通信方法中与终端设备相关的流程。
本申请实施例还提供计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时可以实现上述方法实施例提供的用于载波聚合系统的通信方法中与网络设备相关的流程。
本申请实施例还提供一种通信设备，该通信设备可以是终端设备也可以是电路。该通信设备可以用于执行上述方法实施例中由终端设备所执行的动作。
当该通信设备为终端设备时，图14示出了一种简化的终端设备的结构示意图。便于理解和图示方便，图14中，终端设备以手机作为例子。如图14所示，终端设备包括处理器、存储器、射频电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对终端设备进行控制，执行软件程序，处理软件程序的数据等。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。需要说明的是，有些种类的终端设备可以不具有输入输出装置。
当需要发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。为便于说明，图14中仅示出了一个存储器和处理器。在实际的终端设备产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限 制。
在本申请实施例中，可以将具有收发功能的天线和射频电路视为终端设备的收发单元，将具有处理功能的处理器视为终端设备的处理单元。如图14所示，终端设备包括收发单元1410和处理单元1420。收发单元也可以称为收发器、收发机、收发装置等。处理单元也可以称为处理器，处理单板，处理模块、处理装置等。可选的，可以将收发单元1410中用于实现接收功能的器件视为接收单元，将收发单元1410中用于实现发送功能的器件视为发送单元，即收发单元1410包括接收单元和发送单元。收发单元有时也可以称为收发机、收发器、或收发电路等。接收单元有时也可以称为接收机、接收器、或接收电路等。发送单元有时也可以称为发射机、发射器或者发射电路等。应理解，收发单元1410用于执行上述方法实施例中终端设备侧的发送操作和接收操作。
当该通信设备为芯片时，该芯片包括收发单元和处理单元。其中，收发单元可以是输入输出电路、通信接口；处理单元为该芯片上集成的处理器或者微处理器或者集成电路。
本实施例中的通信设备为终端设备时，可以参照图15所示的设备。作为一个例子，该设备可以完成类似于图11中处理器1110的功能。在图15中，该设备包括处理器1510，发送数据处理器1520，接收数据处理器1530。上述实施例中的接收单元1001和发送单元1002可以是图15中的接收数据处理器1530和发送数据处理器1520。虽然图15中示出了信道编码器、信道解码器，但是可以理解这些模块并不对本实施例构成限制性说明，仅是示意性的。
图16示出本实施例的另一种形式。处理装置1600中包括调制子系统、中央处理子系统、周边子系统等模块。本实施例中的通信设备可以作为其中的调制子系统。具体的，该调制子系统可以包括处理器1603，接口1604。其中处理器1603完成上述处理器1110的功能，接口1604完成上述收发器1130的功能。作为另一种变形，该调制子系统包括存储器1606、处理器1603及存储在存储器1606上并可在处理器上运行的程序，该处理器1603执行该程序时实现上述方法实施例中终端设备侧的方法。需要注意的是，所述存储器1606可以是非易失性的，也可以是易失性的，其位置可以位于调制子系统内部，也可以位于处理装置1600中，只要该存储器1606可以连接到所述处理器1603即可。
作为本实施例的另一种形式，提供一种计算机可读存储介质，其上存储有指令，该指令被执行时执行上述方法实施例中终端设备侧的方法。
作为本实施例的另一种形式，提供一种包含指令的计算机程序产品，该指令被执行时执行上述方法实施例中终端设备侧的方法。
本申请实施例中的网络设备可以如图17所示网络设备1700包括一个或多个射频单元，如远端射频单元(remote radio unit,RRU)1710和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)1720。所述RRU 1710可以称为收发单元，与图13中的收发器1330对应，可选地，该收发单元还可以称为收发机、收发电路、或者收发器等等，其可以包括至少一个天线1711和射频单元1712。所述RRU 1710部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端设备发送指示信息。所述BBU 1710部分主要用于进行基带处理，对基站进行控制等。所述RRU 1710与BBU 1720可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 1720为基站的控制中心，也可以称为处理单元，可以与图13中的处理器1310对应，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理模块)可以用于控制基站执行上述方法实施例中关于网络设备的操作流程，例如，生成上述指示信息等。
在一个示例中，所述BBU1720可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU1720还包括存储器1721和处理器1722。所述存储器1721用以存储必要的指令和数据。所述处理器1722用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器1721和处理器1722可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
应理解，本申请实施例中提及的处理器可以是中央处理单元(central processing unit，CPU)，还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。
需要说明的是，当处理器为通用处理器、DSP、ASIC、FPGA或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件时，存储器(存储模块)集成在处理器中。
应注意，本文描述的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以 硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上对本发明实施例所提供的用于载波聚合系统的通信方法、通信设备、网络设备以及通信系统进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (30)

  1. 一种用于载波聚合系统的通信方法，其特征在于，所述载波聚合系统为包括时分双工TDD载波和频分双工FDD载波的载波聚合系统，所述方法包括：
    终端设备通过辅载波接收下行信息；
    所述终端设备通过主载波发送针对于所述下行信息的反馈信息，当所述主载波或所述辅载波为所述TDD载波时，所述TDD载波中至少存在一个第一子帧，所述第一子帧包含P个连续的短传输时间间隔sTTI，所述P个sTTI中至少存在一个占用2个正交频分复用OFDM符号的sTTI，所述P为大于1的整数。
  2. 根据权利要求1所述的方法，其特征在于，所述第一子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI。
  3. 根据权利要求2所述的方法，其特征在于，当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，所述终端设备通过辅载波接收下行信息，包括：
    所述终端设备通过所述辅载波的所述第一子帧中的第一sTTI接收下行信息，所述第一sTTI为所述P个sTTI中的一个；
    对应地，所述终端设备通过主载波发送针对于所述下行信息的反馈信息，包括：
    所述终端设备通过所述主载波的第二sTTI发送针对于所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
  4. 根据权利要求3所述的方法，其特征在于，当所述辅载波的每个子帧均为所述第一子帧，且所述主载波的每个子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI时，所述终端设备通过所述辅载波的所述第一子帧的第一sTTI接收下行信息,包括：
    所述终端设备通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；
    对应地，所述终端设备通过所述主载波的第二sTTI发送针对于所述下行信息的反馈信息，包括：
    所述终端设备通过所述主载波的上行子帧中的sTTI m发送针对所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
  5. 根据权利要求4所述的方法，其特征在于，所述m＝n+4。
  6. 根据权利要求2所述的方法，其特征在于，当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，所述终端设备通过辅载波接收下行信息，包括：
    所述终端设备通过所述辅载波的第一sTTI接收下行信息；
    对应地，所述终端设备通过主载波发送针对于所述下行信息的反馈信息，包括：
    所述终端设备通过所述主载波的所述第一子帧中的第二sTTI发送针对于所述下行信息的反馈信息，所述第二sTTI为所述P个sTTI中的一个，所述第一sTTI与所述第二sTTI存在定时关系。
  7. 根据权利要求6所述的方法，其特征在于，当所述主载波的每个子帧均为所述第一子帧，且所述辅载波的每个子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI时，所述终端设备通过所述辅载波的第二sTTI接收下行信息,包括：
    所述终端设备通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；
    对应地，所述终端设备通过所述主载波的所述第一子帧的第一sTTI发送针对于所述下行信息的反馈信息，包括：
    所述终端设备通过所述主载波的上行子帧中的sTTI m发送针对所述下行信息的反馈信息，所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
  8. 根据权利要求7所述的方法，其特征在于，所述m＝n+k，所述k为大于3的整数。
  9. 根据权利要求1-8任一所述的方法，其特征在于，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为3，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
  10. 根据权利要求1-8任一所述的方法，其特征在于，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为1或2，所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为2,3,2,2,2,3或者2,2,3,2,2,3。
  11. 根据权利要求1-8任一所述的方法，其特征在于，若所述第一子帧为上行子帧，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
  12. 一种用于载波聚合系统的通信方法，其特征在于，所述载波聚合系统为包括时分双工TDD载波和频分双工FDD载波的载波聚合系统，所述方法包括：
    基站通过辅载波发送下行信息；
    所述基站通过主载波接收针对于所述下行信息的反馈信息，当所述主载波或所述辅载波为所述TDD载波时，所述TDD载波中至少存在一个第一子帧，所述第一子帧包含P个连续的短传输时间间隔sTTI，所述P个sTTI中至少存在一个占用2个正交频分复用OFDM符号的sTTI，所述P为大于1的整数。
  13. 根据权利要求12所述的方法，其特征在于，所述第一子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI。
  14. 据权利要求13所述的方法，其特征在于，当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，所述基站通过辅载波发送下行信息，包括：
    所述基站通过所述辅载波的所述第一子帧中的第一sTTI发送下行信息；
    对应地，所述基站通过主载波接收针对于所述下行信息的反馈信息，包括：
    所述基站通过所述主载波的第二sTTI接收针对于所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
  15. 据权利要求14所述的方法，其特征在于，当所述辅载波的每个子帧均为所述第一子帧，且所述主载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，所述基站通过所述辅载波的所述第一子帧的第一sTTI发送下行信息,包括：
    所述基站通过所述辅载波的下行子帧中的sTTI n发送所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；
    对应地，所述基站通过所述主载波的第二sTTI接收针对于所述下行信息的反馈信息，包括：
    所述基站通过所述主载波的上行子帧中的sTTI m接收针对所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
  16. 据权利要求15所述的方法，其特征在于，所述m＝n+4。
  17. 根据权利要求13所述的方法，其特征在于，当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，所述基站通过辅载波发送下行信息，包括：
    所述基站通过所述辅载波的第一sTTI发送下行信息；
    对应地，所述基站通过主载波接收针对于所述下行信息的反馈信息，包括：
    所述基站通过所述主载波的所述第一子帧中的第二sTTI接收针对于所述下行信息的反馈信息，所述第一sTTI与所述第二sTTI存在定时关系。
  18. 根据权利要求17所述的方法，其特征在于，当所述主载波的每个子帧均为所述第一子帧，且所述辅载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，所述基站通过所述辅载波的第二sTTI发送下行信息,包括：
    所述基站通过所述辅载波的下行子帧中的sTTI n发送所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；
    对应地，所述基站通过所述主载波的所述第一子帧的第一sTTI接收针对于所述下行信息的反馈信息，包括：
    所述基站通过所述主载波的上行子帧中的sTTI m接收针对所述下行信息的反馈信息，所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
  19. 据权利要求13所述的方法，其特征在于，所述m＝n+k，所述k为大于3的整数。
  20. 据权利要求13-19任一所述的方法，其特征在于，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为3，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
  21. 据权利要求13-19任一所述的方法，其特征在于，若所述第一子帧为下行子帧，且物理下行控制信道PDCCH占用的OFDM符号个数为1或2，所述第一子帧所包括的第一个sTTI 到最后一个sTTI占用的OFDM符号个数依次为2,3,2,2,2,3或者2,2,3,2,2,3。
  22. 据权利要求13-19任一所述的方法，其特征在于，若所述第一子帧为上行子帧，则所述第一子帧所包括的第一个sTTI到最后一个sTTI占用的OFDM符号个数依次为3,2,2,2,2,3。
  23. 一种通信设备，其特征在于，所述通信设备用于载波聚合系统，所述载波聚合系统为包括时分双工TDD载波和频分双工FDD载波的载波聚合系统，所述通信设备包括：
    接收单元，用于通过辅载波接收下行信息；
    发送单元，用于通过主载波发送针对于所述接收单元接收的所述下行信息的反馈信息，当所述主载波或所述辅载波为所述TDD载波时，所述TDD载波中至少存在一个第一子帧，所述第一子帧包含P个连续的短传输时间间隔sTTI，所述P个sTTI中至少存在一个占用2个正交频分复用OFDM符号的sTTI，所述P为大于1的整数。
  24. 根据权利要求23所述的通信设备，其特征在于，当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，
    所述接收单元，用于通过所述辅载波的所述第一子帧中的第一sTTI接收下行信息，所述第一子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号个数的sTTI；
    所述发送单元，用于通过所述主载波的第二sTTI发送针对于所述接收单元接收的所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
  25. 根据权利要求24所述的通信设备，其特征在于，当所述辅载波的每个子帧均为所述第一子帧，且所述主载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，
    所述接收单元，用于通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；
    所述发送单元，用于通过所述主载波的上行子帧中的sTTI m发送针对所述接收单元接收的所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
  26. 根据权利要求23所述的通信设备，其特征在于，当所述主载波为所述TDD载波，所述辅载波为所述FDD载波时，
    所述接收单元，用于通过所述辅载波的第一sTTI接收下行信息；
    所述发送单元，用于通过所述主载波的所述第一子帧中的第二sTTI发送针对于所述接收单元接收的所述下行信息的反馈信息，所述第一子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI，所述第一sTTI与所述第二sTTI存在定时关系。
  27. 根据权利要求26所述的通信设备，其特征在于，当所述主载波的每个子帧均为所述第一子帧，且所述辅载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，
    所述接收单元，用于通过所述辅载波的下行子帧中的sTTI n接收所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；
    所述发送单元，用于通过所述主载波的上行子帧中的sTTI m发送针对所述接收单元接收的所述下行信息的反馈信息，所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
  28. 一种网络设备，其特征在于，所述网络设备应用于载波聚合系统，所述载波聚合系统为包括时分双工TDD载波和频分双工FDD载波的载波聚合系统，所述网络设备包括：
    发送单元，用于通过辅载波发送下行信息；
    接收单元，用于通过主载波接收针对于所述发送单元发送的所述下行信息的反馈信息，当所述主载波或所述辅载波为所述TDD载波时，所述TDD载波中至少存在一个第一子帧，所述第一子帧包含P个连续的短传输时间间隔sTTI，所述P个sTTI中至少存在一个占用2个正交频分复用OFDM符号的sTTI，所述P为大于1的整数。
  29. 根据权利要求28所述的网络设备，其特征在于，当所述辅载波为所述TDD载波，所述主载波为所述FDD载波时，
    所述发送单元，用于通过所述辅载波的所述第一子帧中的第一sTTI发送下行信息，所述第一子帧包括占用2个OFDM符号的sTTI和占用3个OFDM符号的sTTI；
    所述接收单元，用于通过所述主载波的第二sTTI接收针对于所述发送单元发送的所述下行信息的反馈信息，所述第二sTTI与所述第一sTTI存在定时关系。
  30. 根据权利要求29所述的网络设备，其特征在于，当所述辅载波的每个子帧均为所述第一子帧，且所述主载波的每个子帧由占用OFDM符号个数为2的sTTI和占用OFDM符号个数为3的sTTI构成时，
    所述发送单元，用于通过所述辅载波的下行子帧中的sTTI n发送所述下行信息，所述sTTI n表示索引标记为n的sTTI，所述sTTI n为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第n的sTTI,所述M为大于0的整数，所述N为大于M的整数；
    所述接收单元，用于通过所述主载波的上行子帧中的sTTI m接收针对于所述发送单元发送的所述下行信息的反馈信息,所述sTTI m表示索引标记为m的sTTI,所述sTTI m为所述载波聚合系统中M个连续子帧内所包含的N个sTTI中按照时序排位在第m的sTTI,所述m的值与通过所述主载波的下行子帧中的sTTI n下发所述下行信息时所对应的用于传输反馈信息的sTTI的索引值相同。
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