WO2017075822A1 - Procédé de transmission de données, dispositif de réseau d'accès, et équipement d'utilisateur - Google Patents

Procédé de transmission de données, dispositif de réseau d'accès, et équipement d'utilisateur Download PDF

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Publication number
WO2017075822A1
WO2017075822A1 PCT/CN2015/094037 CN2015094037W WO2017075822A1 WO 2017075822 A1 WO2017075822 A1 WO 2017075822A1 CN 2015094037 W CN2015094037 W CN 2015094037W WO 2017075822 A1 WO2017075822 A1 WO 2017075822A1
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target
data transmission
subframe
frequency resource
data
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PCT/CN2015/094037
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English (en)
Chinese (zh)
Inventor
郑娟
吴作敏
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华为技术有限公司
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Priority to PCT/CN2015/094037 priority Critical patent/WO2017075822A1/fr
Publication of WO2017075822A1 publication Critical patent/WO2017075822A1/fr

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    • 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

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data transmission method, an access network device, and a user equipment.
  • each device needs to use frequency resources for information transmission, and the frequency resources are also referred to as spectrum or frequency bands.
  • the frequency band can be divided into a licensed frequency band and an unlicensed frequency band, and the unlicensed frequency band is also called an unlicensed frequency band.
  • the licensed frequency band is a frequency resource exclusive to some operators, and the unlicensed frequency band is a common frequency resource in a wireless communication network.
  • LAA-LTE Licensed-Assisted Access Using LTE
  • CA Carrier Aggregation in the existing Long-term Evolution (LTE) system.
  • the LTE device can use the licensed carrier as the primary component carrier (PCC) or the primary cell (PCell) in the CA mode, and use the unlicensed carrier as the secondary component carrier (SCC).
  • PCC primary component carrier
  • PCell primary cell
  • SCC secondary component carrier
  • a secondary cell such that the LTE device can inherit the traditional advantages of the LTE device for wireless communication through the licensed carrier, for example, in terms of mobility, security, quality of service, and simultaneous handling of multi-user scheduling, It is also possible to reduce the load of the licensed carrier by using the unlicensed carrier to achieve the purpose of network capacity offloading.
  • the LAA system uses unlicensed band resources, it is subject to local regulations for the use of unlicensed bands.
  • the license-free target band considered by LAA-LTE is the 5 GHz unlicensed band opened by governments.
  • the coexistence specifications include Transmit Power Control (TPC), Dynamic Frequency Selection (DFS), and channel occupied bandwidth. And listen first (Listen Before talk, LBT) and so on.
  • TPC Transmit Power Control
  • DFS Dynamic Frequency Selection
  • LBT listen first
  • TPC is to prevent wireless products from transmitting excessive power to interfere with radar.
  • DFS is to enable wireless products to actively detect the frequency used by radar, and actively select another frequency to avoid radar frequency.
  • the channel occupancy bandwidth requirement is when wireless communication When the device works in the 5G frequency band, its occupied channel bandwidth should reach 80% to 100% of its claimed channel bandwidth.
  • LBT is a coexistence strategy between systems. The wireless communication system needs to communicate in the unlicensed band. Use the LBT rules.
  • the basic idea of the LBT rule is: Before each communication device sends a signal on a certain channel, it needs to detect whether the current channel is idle, that is, whether it can detect that the nearby node is occupying the current channel transmission signal. This detection process is called idle. Clear Channel Assessment (CCA); if the channel is detected to be idle for a period of time, the communication device can use the idle channel to transmit a signal; if the channel is detected to be occupied, the communication device cannot currently use the channel. Send a signal.
  • CCA Clear Channel Assessment
  • whether the channel is idle or not can be implemented by signal detection, energy detection, etc., accordingly, if a specific signal is not detected, the channel can be considered idle; if energy detection is used, if it is received or detected If the energy is below a certain threshold, the channel can also be considered idle.
  • the data transmission of LTE devices in the unlicensed band is opportunistic, that is, discontinuous.
  • the LTE system can allow time resources and frequency resources of less than one subframe (referred to as partial subframes) to be used for data transmission, as shown in the figure.
  • the length of the partial subframe is generally less than 1 ms, and the length of the complete subframe is 1 ms.
  • the transmission format of the last partial subframe may adopt a Downlink Pilot Time Slot (DwPTS) format, and the DwPTS is a time division duplex (Time Division) Duplexing, TDD)
  • DwPTS Downlink Pilot Time Slot
  • TDD Time Division Duplexing
  • the frame structure of the existing TDD LTE system includes a downlink subframe, a special subframe, and an uplink subframe, as shown in FIG. 2, where two radio subframes (RFs) include two special subframes as an example.
  • the length of the special subframe is 1 ms, that is, 1 subframe, which is composed of DwPTS, Guard Period (GP), and Uplink Pilot Time Slot.
  • the TDDLTE system currently defines different special subframe configurations for the Normal Cyclic Prefix (NCP) and the Extended Cyclic Prefix (ECP), respectively, where different special sub-frames are defined. At least one of the lengths of the DwPTS, GP, and UpPTS included in the frame configuration is different, as shown in Table 1 below.
  • the lengths of DwPTS and UpPTS are represented by the number of symbols, and the time occupied by the GP can be calculated by subtracting the time occupied by DwPTS and UpPTS by the length of one subframe (ie, 1 ms).
  • the number of orthogonal frequency division multiplexing (OFDM) symbols included in the UpPTS in Table 1 is applicable not only to the case of the upper behavior NCP but also to the case of the upper behavior ECP. For example, suppose the special subframe configuration is 0. In the case of the next NCP behavior, the DwPTS includes 3 OFDM symbols, and the UpPTS includes 1 OFDM symbol for both the uplink NCP and the uplink ECP.
  • the third OFDM symbol included in the DwPTS carries a Primary Synchronization Signal (PSS), and in frequency, the PSS is distributed in the center of the system bandwidth.
  • PSS Primary Synchronization Signal
  • the main function of the PSS is to help the user equipment implement symbol timing, frequency synchronization, and the Joint Synchronization Signal (SSS) to help the user equipment to identify the identity of the cell.
  • SSS Joint Synchronization Signal
  • the RRM measurement here includes, but is not limited to, Reference Signal Received Power (RSRP) measurement and Reference Signal Received Quality (RSRQ) measurement.
  • RSRP Reference Signal Received Power
  • RSSQ Reference Signal Received Quality
  • the PSS needs to occupy the network time-frequency resources, and the role of the DRS is the same as that of the user equipment. Therefore, the time-frequency resources occupied by the PSS cause network resources to be wasted.
  • the embodiment of the present invention provides a data transmission method, an access network device, and a user equipment, which are used to transmit data in a target time-frequency resource in a target subframe on a target frequency band, thereby improving utilization of network time-frequency resources.
  • the first aspect of the present invention provides a data transmission method, including:
  • the access network device determines a target subframe on the target frequency band, where the target frequency band is an unlicensed frequency band, and the downlink data transmission length of the target subframe is less than a threshold;
  • the access network device determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and carries the transmission data to the target time-frequency resource according to the data transmission feature, where the target The time-frequency resource is the primary synchronization signal PSS bit of the target subframe.
  • the method further includes:
  • the access network device sends control information and/or a first reference signal to the user equipment, and the control information and/or the first reference signal is used to determine the target subframe.
  • the sending, by the access network device, the control information and/or the first reference signal to the user equipment includes:
  • the access network device carries the first reference signal to the target time-frequency resource of the target subframe, and sends the signal to the user equipment, where the first reference signal includes at least a PSS or a secondary synchronization signal SSS.
  • the first reference signal includes at least a PSS or a secondary synchronization signal SSS.
  • the access network device determines the target sub-subject according to a preset rule.
  • a data transmission feature of the target time-frequency resource in the frame, and carrying the transmission data to the target time-frequency resource according to the data transmission feature includes:
  • the access network device Determining, by the access network device, a data transmission feature of the target time-frequency resource according to a preset valid data bearer rule, and carrying valid data to the target time-frequency resource according to the data transmission feature, the valid data Include at least one of service data, control data, and a second reference signal, the valid data not including a PSS;
  • the access network device determines, according to a preset indication information bearer rule, a data transmission feature of the target time-frequency resource, and carries the first indication information to the target time-frequency resource according to the data transmission feature,
  • the first indication information is used to indicate a downlink data transmission length of the target subframe;
  • the second indication information is used to indicate a length of time that the access network device does not have downlink data transmission after the target subframe of the target frequency band.
  • a second aspect of the present invention provides a data transmission method, including:
  • the resource is the primary synchronization signal PSS bit of the target subframe.
  • the user equipment is Target sub-frames on the target frequency band include:
  • the user equipment determines a target subframe according to the pre-configuration information, and the pre-configuration information is used to determine the target subframe.
  • the determining, by the user equipment, the target subframe according to the detected first reference signal includes:
  • the user equipment determines the target subframe according to a preset rule.
  • the data transmission feature of the target time-frequency resource, and acquiring the transmission data carried by the target time-frequency resource according to the data transmission feature includes:
  • the valid data includes at least one of service data, control data, and a second reference signal, the valid data not including a PSS;
  • the first indication information is used to indicate a downlink data transmission length of the target subframe
  • the second indication information is used to indicate a length of time that the access network device does not have downlink data transmission after the target subframe of the target frequency band.
  • a third aspect of the present invention provides an access network device, including:
  • a first determining module configured to determine a target subframe on the target frequency band, where the target frequency band is an unlicensed frequency band, and a downlink data transmission length of the target subframe is less than a threshold;
  • a first processing module configured to determine, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and carry the transmission data to the target time-frequency resource according to the data transmission feature,
  • the target time-frequency resource is the primary synchronization signal PSS bit of the target subframe.
  • the access network device further includes: a sending module
  • the sending module is configured to send control information and/or a first reference signal to the user equipment, where the control information and/or the first reference signal is used to determine the target subframe.
  • the sending module is specifically configured to carry the first reference signal to the target time-frequency resource of the target subframe, and send the signal to the user equipment, where the first reference signal includes at least a PSS or a secondary synchronization signal SSS one of the.
  • the first processing module is configured to determine, according to a preset valid data bearer rule, a data transmission feature of the target time-frequency resource, and carry valid data to the target time-frequency resource according to the data transmission feature,
  • the valid data includes at least one of service data, control data, and a second reference signal, the valid data not including a PSS;
  • the first processing module is configured to determine a data transmission feature of the target time-frequency resource according to a preset indication information bearer rule, and carry the first indication information on the target time-frequency according to the data transmission feature.
  • a resource the first indication information is used to indicate downlink data transmission of the target subframe length;
  • the first processing module is configured to determine a data transmission feature of the target time-frequency resource according to a preset indication information bearer rule, and carry the second indication information to the target time-frequency according to the data transmission feature.
  • the second indication information is used to indicate a length of time that the access network device does not have downlink data transmission after the target subframe of the target frequency band.
  • a user equipment comprising:
  • a second determining module configured to determine a target subframe on the target frequency band, where a downlink data transmission length of the target subframe is less than a threshold
  • a second processing module configured to determine, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and acquire, according to the data transmission feature, transmission data carried by the target time-frequency resource, where
  • the target time-frequency resource is the primary synchronization signal PSS bit of the target subframe.
  • the second determining module is specifically configured to determine a target subframe according to the detected control information, where the control information is used to determine the target subframe;
  • the second determining module is specifically configured to determine a target subframe according to the detected first reference signal, where the first reference signal is used to determine the target subframe;
  • the second determining module is specifically configured to determine a target subframe according to the pre-configuration information, where the pre-configuration information is used to determine the target subframe.
  • the second determining module is configured to determine a target subframe according to the first reference signal in the detected target time-frequency resource, where the first reference signal is carried by the target time-frequency resource, and the first reference signal At least one of the PSS or the secondary synchronization signal SSS is included.
  • the second processing module is specifically configured to determine the target according to a preset valid data bearer rule. Generating a data transmission feature in the target time-frequency resource in the subframe, and acquiring valid data carried by the target time-frequency resource according to the data transmission feature, where the valid data includes service data, control data, and a second reference signal. At least one of the valid data does not include a PSS;
  • the second processing module is configured to determine, according to a preset indication information bearer rule, a data transmission feature in a target time-frequency resource in the target subframe, and obtain the target time-frequency according to the data transmission feature.
  • First indication information carried by the resource where the first indication information is used to indicate a downlink data transmission length of the target subframe;
  • the second processing module is configured to determine, according to a preset indication information bearer rule, a data transmission feature in a target time-frequency resource in the target subframe, and obtain the target time-frequency according to the data transmission feature.
  • the second indication information carried by the resource where the second indication information is used to indicate a length of time that the access network device does not have downlink data transmission after the target subframe of the target frequency band.
  • the access network device After determining the target subframe, the access network device determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and carries the transmission data to the target time-frequency resource according to the data transmission feature, and the user equipment determines the target subframe. Obtaining the transmission data carried by the target time-frequency resource, compared with the target time-frequency resource carrying PSS in the prior art, the target time-frequency resource is used to carry the transmission data, thereby improving the utilization of the network time-frequency resource.
  • FIG. 1 is a diagram showing a complete subframe and a partial subframe in a data transmission process based on an LBT rule according to the present invention. intention;
  • FIG. 2 is a schematic diagram of a radio frame provided by the present invention.
  • FIG. 3 is a schematic diagram of a special subframe provided by the present invention.
  • FIG. 4 is a schematic diagram of a data transmission burst provided by the present invention.
  • FIG. 5 is a schematic diagram of a method for data transmission according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a method for data transmission in another embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an access network device according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of an access network device according to another embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of interaction between an access network device and each module of a user equipment according to an embodiment of the present invention.
  • the embodiment of the present invention provides a data transmission method, an access network device, and a user equipment, which are used to transmit data in a target time-frequency resource in a target subframe on a target frequency band, thereby improving utilization of network time-frequency resources.
  • the present invention is applied to a wireless communication system, particularly for an LTE system that permits band access assistance, that is, a LAA-LTE system.
  • the LTE system with the licensed band assisted access refers to the LTE system that uses the licensed band and the unlicensed band together by CA or non-CA. specific:
  • the mainstream deployment scenario is a scenario where the licensed band and the unlicensed band are jointly used by the CA.
  • the carrier included in the licensed band or the licensed band or the cell working in the licensed band is used as the primary cell, and the carrier included in the unlicensed band or the unlicensed band is included.
  • a cell operating on an unlicensed band as a secondary cell The primary cell and the secondary cell may be deployed in a common station or a non-common station, and an ideal backhaul path between the two cells.
  • the present invention is not limited to the scenario of the above-mentioned CA.
  • Other deployment scenarios include scenarios where there is no ideal backhaul path between two cells (the primary cell and the secondary cell), such as a large backhaul delay, resulting in a situation between two cells. Unable to coordinate information quickly.
  • both the licensed band and the unlicensed band may include one or more carriers; the licensed band and the unlicensed band may be included in the CA, and may include one or more carriers included in the licensed band and the unlicensed band included One or more carriers are used for CA.
  • the cell mentioned in the present invention may be a cell corresponding to the base station, and the cell may belong to the macro base station, or may belong to the base station corresponding to the small cell, and the small cell may include: a city cell, a micro cell, a pico cell, a femto cell, and the like. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services. On a carrier in an LTE system, multiple cells can work at the same frequency at the same time. In some special scenarios, the concept of a carrier and a cell in an LTE system can be considered to be equivalent. For example, in a CA scenario, when a secondary carrier is configured for a user equipment.
  • the carrier identifier of the secondary carrier and the cell identifier of the secondary cell working in the secondary carrier may be carried in the same manner.
  • the concept of the carrier and the cell may be considered as equivalent, for example, user equipment access.
  • One carrier is equivalent to accessing one cell.
  • the access network device is a network device, such as a base station, that has radio frame generation and/or configuration in the LTE system.
  • the user equipment includes a relay relay and a device that can perform data communication with the base station, and is introduced in the present invention by a user equipment in a general sense.
  • an embodiment of the present invention provides a data transmission method, including:
  • the access network device determines a target subframe on the target frequency band.
  • the target frequency band is an unlicensed frequency band
  • the downlink data transmission length of the target subframe is If the threshold is smaller than the threshold, the threshold set here is used to distinguish the complete subframe from the partial subframe in the radio frame.
  • the threshold is the complete subframe, the smaller than the threshold is the partial subframe, and the target subframe belongs to the partial subframe.
  • the device determines the target subframe on the target frequency band according to the standards of the prior art.
  • the access network device determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and carries the transmission data to the target time-frequency resource according to the data transmission feature.
  • the access network device determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, where the data transmission feature is used to indicate that the target time-frequency resource should be transmitted.
  • Data type according to the data transmission feature, the transmission data is carried in the target time-frequency resource, the target time-frequency resource is the PSS bit of the target subframe, and the PSS bit is in the third OFDM symbol of the target subframe, and in the frequency, the PSS bit is Within 1.4 MHz of the system bandwidth center or 72 subcarriers of the system bandwidth center, the system bandwidth center here can also be understood as the center of the target frequency band.
  • the access network device determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and carries the transmission data to the target time-frequency resource according to the data transmission feature.
  • the user equipment can obtain the transmission data carried by the target time-frequency resource.
  • the target time-frequency resource is used to carry the transmission data, thereby improving the utilization of the network time-frequency resource.
  • the method further includes:
  • the access network device transmits control information and/or a first reference signal to the user equipment, and the control information and/or the first reference signal is used to determine the target subframe.
  • the access network device sends the control information and/or the first reference signal to the user equipment, so that the user equipment can determine the target subframe according to the control information and/or the first reference signal, so that the solution is more complete.
  • the sending, by the access network device, the control information and/or the first reference signal to the user equipment includes:
  • the access network device carries the first reference signal to the target time-frequency resource of the target subframe, and sends the signal to the user equipment, where the first reference signal includes at least one of the PSS or the secondary synchronization signal SSS.
  • the access network device only sends the target time-frequency resource (that is, the PSS bit) of the target subframe.
  • the first reference signal or it can be understood that if the target subframe adopts the transmission mode of DwPTS, the PSS bit includes the PSS.
  • the target subframe when the data transmission format of the DwPTS is used in the target subframe, the target subframe includes the PSS in the PSS bit, so that the user equipment can detect whether there is a PSS, and the target subframe can be determined, so that the implementation of the scheme is further implemented. Convenient.
  • the access network device determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and carries the transmission data to the target time-frequency resource according to the data transmission feature.
  • the access network device determines the data transmission characteristics of the target time-frequency resource according to the preset valid data bearer rule, and carries the valid data to the target time-frequency resource according to the data transmission feature, where the valid data includes the service data, the control data, and the second reference. At least one of the signals, the valid data does not include the PSS;
  • the access network device determines the data transmission feature of the target time-frequency resource according to the preset indication information bearer rule, and carries the first indication information to the target time-frequency resource according to the data transmission feature, where the first indication information is used to indicate the target subframe.
  • the access network device determines the data transmission feature of the target time-frequency resource according to the preset indication information bearer rule, and carries the second indication information to the target time-frequency resource according to the data transmission feature, where the second indication information is used to indicate the access network.
  • the access network device when the transmission data is valid data, the first indication information, or the second indication information, the access network device performs processing separately, so that the solution is more specific.
  • a method for data transmission of a pair of access network device ends is described.
  • the following describes a method for data transmission from a user equipment end.
  • an embodiment of the present invention provides a data transmission method, including:
  • the user equipment determines a target subframe on the target frequency band.
  • the target frequency band is an unlicensed frequency band
  • the downlink data transmission length of the target subframe is smaller than a threshold.
  • the threshold set here is used to distinguish the complete subframe from the partial subframe in the wireless frame, and the threshold is complete.
  • the frame is smaller than the threshold, and the target subframe belongs to the partial subframe.
  • the user equipment determines the target subframe on the target frequency band according to the standard of the prior art.
  • the user equipment determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and acquires transmission data carried by the target time-frequency resource according to the data transmission feature.
  • the user equipment determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, where the data transmission feature is used to indicate a transmission data type of the target time-frequency resource bearer.
  • the target time-frequency resource is the PSS bit of the target subframe, and the PSS bit is in the third OFDM symbol of the target subframe, and the PSS bit is the system bandwidth in frequency.
  • the system bandwidth center here can also be understood as the center of the target frequency band.
  • the user equipment after determining the target subframe, determines a data transmission feature carried by the access network device on the target time-frequency resource in the target subframe, and acquires transmission data carried by the target time-frequency resource according to the data transmission feature.
  • the target time-frequency resource is used to carry the transmission data, thereby improving the utilization rate of the time-frequency resources of the communication network.
  • determining, by the user equipment, the target subframe on the target frequency band includes:
  • the user equipment determines the target subframe according to the pre-configuration information, and the pre-configuration information is used to determine the target subframe.
  • the user equipment detects the control information or the first reference signal or determines the target subframe according to the preset configuration information, so that the solution is more complete.
  • the user equipment is determined according to the detected first reference signal.
  • the target sub-frames include:
  • the user equipment determines the target subframe according to the first reference signal in the detected target time-frequency resource, where the first reference signal is carried in the target time-frequency resource, and the first reference signal includes at least one of the PSS or the SSS.
  • the target subframe adopts the transmission mode of the DwPTS, and the target time-frequency resource (ie, the PSS bit) of the target subframe includes the PSS, and then the user equipment detects whether there is a first reference signal (for example, PSS). Determine the target subframe.
  • the target time-frequency resource ie, the PSS bit
  • PSS first reference signal
  • the user equipment when the data transmission format of the DwPTS is used in the target subframe, the user equipment detects whether there is a PSS, and the target subframe can be determined, so that the implementation of the scheme is more convenient.
  • the user equipment determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and acquires, according to the data transmission feature, the transmission data that is carried by the target time-frequency resource, where:
  • the user equipment determines, according to the preset valid data bearer rule, the data transmission feature in the target time-frequency resource in the target subframe, and obtains valid data carried by the target time-frequency resource according to the data transmission feature, where the valid data includes the service data and the control data. And at least one of the second reference signals, the valid data does not include the PSS;
  • the user equipment determines, according to the preset indication information bearer rule, the data transmission feature in the target time-frequency resource in the target subframe, and obtains the first indication information of the target time-frequency resource bearer according to the data transmission feature, where the first indication information is used. Indicates the downlink data transmission length of the target subframe;
  • the user equipment determines, according to the preset indication information bearer rule, the data transmission feature in the target time-frequency resource in the target subframe, and obtains the second indication information of the target time-frequency resource bearer according to the data transmission feature, where the second indication information is used. Indicates the length of time that the access network device does not have downlink data transmission after the target subframe of the target frequency band.
  • the user equipment when the transmission data is valid data, the first indication information, or the second indication information, the user equipment separately obtains the transmission data, so that the solution is more specific.
  • the transmission data in addition to carrying the transmission data to the target time-frequency resource, the transmission data may be carried in a specific time-frequency resource, and the frequency included in the specific time-frequency resource.
  • the resource is the same as the frequency resource in which the PSS bit of the primary synchronization signal is located, and the time resource included in the specific time-frequency resource may be a time resource included in the subframe in which the PSS bit of the primary synchronization signal is located.
  • the access network device takes a base station as an example.
  • the base station establishes a communication connection with the user equipment (for example, a mobile phone), and uses the licensed frequency band and the unlicensed frequency band to perform data transmission, and the base station determines according to the service load, the time position of preempting the resource in the unlicensed frequency band, or the maximum transmission duration of a burst data.
  • the target sub-frame on the target frequency band can also be defined in other ways.
  • the target frequency band is the unlicensed frequency band.
  • the downlink data transmission length of the target subframe is smaller than the threshold.
  • the threshold set here is used to distinguish the complete subframe and part.
  • a threshold is obtained as a complete subframe, and a threshold smaller than a threshold is a partial subframe, and the target subframe belongs to a partial subframe.
  • data transmission is opportunistic, and one burst of data includes a plurality of subframes, which have a complete subframe and a partial subframe.
  • a burst of data refers to a time range in which the base station can perform data transmission through a contention mechanism (for example, an LBT mechanism) after the base station preempts the unlicensed band resources.
  • the target subframe is the last subframe of one burst data, or the data transmission start position of the target subframe is at the subframe boundary.
  • the first cell can be understood as a cell that performs data transmission on a target frequency band and belongs to a cell in the base station, and the fifth subframe in FIG. 4 is a target subframe.
  • the base station After the base station determines the target subframe, (1) the base station sends the control information to the user equipment through the target frequency band or the non-target frequency band, and the frequency band of the non-target frequency band is different from the frequency band of the target frequency band, for example, the non-target frequency band may be the licensed frequency band.
  • the control information may be carried in any subframe within the data transmission burst of the target frequency band, or may be carried in the subframe of the non-target frequency band.
  • the control information may directly indicate the target subframe. In this case, the user equipment may determine the target subframe according to the control information.
  • the control information may also indicate the downlink data transmission length of the target subframe, and the user equipment may determine the target according to the control information.
  • the downlink data transmission length of the subframe is compared with a threshold to determine whether the target subframe is a partial subframe.
  • the control information may be carried in a control channel of a target frequency band or a non-target frequency band, or may be carried in a data channel of a target frequency band or a non-target frequency band.
  • the control channel includes at least one of the following: a physical downlink control channel (Physical Downlink Control Channel, PDCCH), a physical control format indicator channel (PCFICH), and physical mixing.
  • the base station transmits the first reference signal only in the target time-frequency resource (ie, the PSS bit) of the target subframe, or it can be understood that if the target subframe adopts the transmission mode of the DwPTS, the PSS bit includes the PSS.
  • the target time-frequency resource ie, the PSS bit
  • the user equipment can determine whether it is the target subframe by detecting whether the PSS bit of each subframe on the target frequency band has a PSS. Further, the user equipment may first determine whether the subframe of the base station in the target frequency band has data transmission, and when determining that the base station has data transmission in the subframe on the target frequency band (correspondingly, the corresponding base station preempts the subframe in the target frequency band) The unlicensed band resource is further checked whether the PSS bit of the subframe includes the PSS. If the PSS is included, the subframe is the target subframe.
  • the user equipment determines whether the base station has data transmission in the subframe of the target frequency band, and may be implemented by the base station transmitting the indication information, or may be implemented by the user equipment blind detection, for example, detecting whether each subframe on the target frequency band includes the cell-specific reference signal (Cell -Specific Reference Signal (CRS), if the CRS is included, it can be determined that the base station has data transmission in the subframe of the target frequency band, and the user equipment determines whether the base station has data transmission in the subframe of the target frequency band, and can be implemented by other means, Make specific limits.
  • the first reference signal can also be used to indicate the data transmission length of the target subframe.
  • the base station determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, where the preset rule is common to the base station and the user equipment, and the preset rule may be a valid data bearer rule and an indication information bearer rule, and data transmission
  • the feature is used to indicate the type of transmission data that the target time-frequency resource should carry.
  • the transmission data has three types, namely: valid data, first indication information, and second indication information.
  • the valid data includes at least one of service data, control data, and a second reference signal
  • the service data includes data carried by at least one of the following channels: PDSCH, PMCH, or other service data channel supported by the LTE system
  • the control data includes the following: Data carried by at least one channel: PDCCH, PCFICH, PHICH, EPDCCH, PBC, or other control data channel supported by the LTE system
  • the second reference signal includes at least one of the following: CRS, multimedia broadcast multicast service, single frequency network reference letter (Multimedia Broadcast multicast service Single Frequency Network Reference Signal, MBSFN RS), UE-specific Reference Signal (DM-RS) for PDSCH, DeModulation Reference Signal for EPDCCH (DeModulation Reference Signal, DM-RS), Positioning Reference Signal (PRS), Channel State Information Reference Signal (CSI-RS) or Discovery Reference Signal (DRS), it should be noted that In the embodiment of the present invention, any signal included in the DRS may be referred to as DRS, which is distinguished from the prior art, and the
  • the first indication information is used to indicate a downlink data transmission length of the target subframe.
  • the second indication information is used to indicate the length of time that the base station does not have downlink data transmission after the target subframe of the target frequency band, that is, the user equipment does not need to detect downlink data transmission of the unlicensed frequency band within this time length. It should be noted that the first indication information and the second indication information may be implemented by means of signaling, or may be implemented by means of sequence detection, and are not specifically limited.
  • the base station carries the transmission data to the target time-frequency resource (that is, the PSS bit) according to the data transmission feature. It should be noted that the base station may also carry the transmission data on the signal composed of the sequence or the sequence, and then the signal composed of the sequence or the sequence.
  • the base station and the user equipment are pre-agreed, and one sequence form corresponds to one downlink data length of the target subframe, and the user equipment is based on the detected sequence or sequence.
  • the sequence form of the composed signal determines the downlink data transmission length of the target subframe.
  • the sequence uses the sequence that constitutes the PSS, that is, the Zadoff-Chu sequence, which is referred to as the ZC sequence.
  • the PSS has three performances. Form, so PSS can be used to represent three different data transmission lengths in three different sequence forms.
  • the user equipment needs to perform the step of decoding the signal composed of the sequence or sequence.
  • the target subframe is a partial subframe and uses the data transmission format of the DwPTS, then the target subframe includes the PSS in the PSS bit itself, and the complete subframe does not include the PSS, so the user equipment only needs to If the current subframe of the target frequency band detects the PSS, the current subframe may be determined as the target subframe.
  • the user equipment determines the target in the target subframe according to a preset rule.
  • the data transmission feature of the time-frequency resource may include: the user equipment determining a target time-frequency resource carrying PSS of the target subframe. Further, the downlink data transmission length of the target subframe may also be determined according to a sequence form constituting the PSS.
  • the user terminal may determine the target subframe according to the pre-configuration information, and the pre-configuration information indicates that the access network device is in the target frequency band, in addition to determining the target subframe on the target frequency band according to the detected control information and/or the first reference signal.
  • the maximum time for transmitting data on the maximum time is the maximum time range for a data transmission burst of the access network device on the target frequency band.
  • the regulations clearly define a maximum data transmission time of 4 ms; in addition, in Europe, for the use of unlicensed bands, the regulations clearly define a maximum data transmission time of 10 ms or 13 ms or 8 ms.
  • the user equipment can determine the target subframe by considering the pre-configuration information in the target frequency band by determining the starting position of a data transmission burst.
  • the user equipment After determining the target subframe, the user equipment determines, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and acquires transmission data carried by the target time-frequency resource according to the data transmission feature, and the operation performed by the base station may be performed. It is known that the user equipment determines the transmission data type of the transmission data in the target time-frequency resource according to the preset valid data bearer rule or the indication information bearer rule, so as to perform corresponding operations for different data types to obtain the transmission data, if the data is transmitted. If it is carried on a signal composed of a sequence or a sequence, it is also necessary to decode the signal composed of the sequence or the sequence to obtain the transmission data.
  • the user equipment obtains the first indication information to determine the downlink data transmission length of the target subframe, which is beneficial to the user equipment to accurately demodulate the data and perform channel quality measurement on the target frequency band, for example, Measurement of Channel State Information (CSI).
  • CSI Measurement of Channel State Information
  • the user equipment may obtain the second indication information to determine the length of time that the base station does not have downlink data transmission after the target subframe of the target frequency band, and for the LBT rule, the detection of the user equipment may be reduced. The number of times avoids the detection of the unlicensed band in the time range in which the downlink data transmission is impossible, and can save power. It should be noted that the user equipment can implement one or more carriers in the unlicensed band. The downlink data detection is stopped, and the downlink data detection for which carriers are stopped can be notified to the user equipment by the base station.
  • the information content carried by the first indication information and the second indication information may be valid through one carrier on the unlicensed frequency band, or may be valid for multiple carriers, and is not specifically limited.
  • the target time-frequency resource bearer of the target subframe is used in the prior art. Compared with PSS, the target time-frequency resource carries valid data, which improves the utilization of network time-frequency resources.
  • transmission data may also be other data types, and the specific type is not limited herein.
  • the PSS bits in the target subframe are used to carry transmission data, and the use of network time-frequency resources is utilized. It is beneficial.
  • the foregoing embodiment describes a method for data transmission.
  • the following embodiments respectively describe an access network device and a user equipment.
  • an embodiment of the present invention provides an access network device, including:
  • the first determining module 701 is configured to determine a target subframe on the target frequency band, where the target frequency band is an unlicensed frequency band, and the downlink data transmission length of the target subframe is less than a threshold;
  • the first processing module 702 is configured to determine, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and carry the transmission data to the target time-frequency resource according to the data transmission feature, where the target time-frequency resource is the target The PSS bit of the frame.
  • the first processing module 702 determines the data transmission feature of the target time-frequency resource in the target subframe according to the preset rule, and transmits the data bearer according to the data transmission feature.
  • the target time-frequency resource enables the user equipment to obtain the transmission data carried by the target time-frequency resource.
  • the target time-frequency resource is used to carry the transmission data, and the time-frequency of the communication network is improved. Utilization of resources.
  • the access network device further includes: a sending module 801;
  • the sending module 801 is configured to send control information and/or a first reference signal to the user equipment, where the control information and/or the first reference signal is used to determine a target subframe.
  • the sending module 801 is specifically configured to carry the first reference signal to the target time-frequency resource of the target subframe, and send the signal to the user equipment, where the first reference signal includes at least one of a PSS or an SSS.
  • the first processing module 602 is specifically configured to determine, according to a preset valid data bearer rule, a data transmission feature of the target time-frequency resource, and carry the valid data to the target time-frequency resource according to the data transmission feature, where the valid data includes the service data and the control At least one of data and a second reference signal, the valid data does not include the PSS;
  • the first processing module 602 is specifically configured to determine a data transmission feature of the target time-frequency resource according to the preset indication information bearer rule, and carry the first indication information to the target time-frequency resource according to the data transmission feature, where the first indication information is used.
  • the downlink data transmission length indicating the target subframe
  • the first processing module 602 is specifically configured to determine a data transmission feature of the target time-frequency resource according to the preset indication information bearer rule, and carry the second indication information to the target time-frequency resource according to the data transmission feature, where the second indication information is used.
  • the third embodiment describes the access network device, and the user equipment is described below.
  • an embodiment of the present invention provides a user equipment, including:
  • the second determining module 901 is configured to determine a target subframe on the target frequency band, where a downlink data transmission length of the target subframe is less than a threshold;
  • the second processing module 902 is configured to determine, according to a preset rule, a data transmission feature of the target time-frequency resource in the target subframe, and obtain transmission data carried by the target time-frequency resource according to the data transmission feature, where the target time-frequency resource is the target The PSS bit of the frame.
  • the second processing module 902 determines a data transmission feature carried by the access network device on the target time-frequency resource in the target subframe, and acquires the target according to the data transmission feature.
  • the transmission data carried by the time-frequency resource is compared with the target time-frequency resource carrying PSS in the prior art, and the target time-frequency resource is used to carry the transmission data, thereby improving the utilization rate of the time-frequency resource of the communication network.
  • the second determining module 801 is specifically configured to determine a target subframe according to the detected control information, where the control information is used to determine the target subframe.
  • the second determining module 801 is specifically configured to determine a target subframe according to the detected first reference signal, where the first reference signal is used to determine the target subframe;
  • the second determining module 801 is specifically configured to determine a target subframe according to the pre-configuration information, where the pre-configuration information is used to determine the target subframe.
  • the second determining module 801 is specifically configured to determine, according to the first reference signal in the detected target time-frequency resource, the target subframe, where the first reference signal is carried in the target time-frequency resource, and the first reference signal includes at least the PSS or the secondary synchronization signal.
  • One of the SSS is specifically configured to determine, according to the first reference signal in the detected target time-frequency resource, the target subframe, where the first reference signal is carried in the target time-frequency resource, and the first reference signal includes at least the PSS or the secondary synchronization signal.
  • One of the SSS is specifically configured to determine, according to the first reference signal in the detected target time-frequency resource, the target subframe, where the first reference signal is carried in the target time-frequency resource, and the first reference signal includes at least the PSS or the secondary synchronization signal.
  • the second processing module 802 is specifically configured to determine, according to the preset valid data bearer rule, a data transmission feature in the target time-frequency resource in the target subframe, and obtain valid data carried by the target time-frequency resource according to the data transmission feature, which is effective.
  • the data includes at least one of service data, control data, and a second reference signal, and the valid data does not include the PSS;
  • the second processing module 802 is specifically configured to determine, according to the preset indication information bearer rule, a data transmission feature in the target time-frequency resource in the target subframe, and obtain the first indication information of the target time-frequency resource bearer according to the data transmission feature.
  • the first indication information is used to indicate a downlink data transmission length of the target subframe.
  • the second processing module 802 is specifically configured to determine, according to the preset indication information bearer rule, a data transmission feature in the target time-frequency resource in the target subframe, and obtain a second indication information of the target time-frequency resource bearer according to the data transmission feature.
  • the second indication information is used to indicate a length of time that the access network device does not have downlink data transmission after the target subframe of the target frequency band.
  • the access network device takes a base station as an example.
  • the base station establishes a communication connection with the user equipment (for example, a mobile phone), and performs data transmission by using the licensed frequency band and the unlicensed frequency band, and the first determining module 701 of the base station preempts the resource in the unlicensed frequency band according to the service load.
  • the location or the maximum transmission duration of a burst of data, and the target subframe on the target frequency band may be determined by other methods without specific limitation.
  • the target frequency band is an unlicensed frequency band, and the downlink data transmission length of the target subframe is less than a threshold.
  • the threshold set is used to distinguish between a complete subframe and a partial subframe.
  • a threshold is obtained as a complete subframe, and a threshold smaller than a threshold is a partial subframe, and the target subframe belongs to a partial subframe.
  • data transmission is opportunistic, and one burst of data includes a plurality of subframes, which have a complete subframe and a partial subframe.
  • a burst of data refers to a time range in which the base station can perform data transmission through a contention mechanism (for example, an LBT mechanism) after the base station preempts the unlicensed band resources.
  • the target subframe is the last subframe of one burst data, or the data transmission start position of the target subframe is at the subframe boundary.
  • the first cell can be understood as a cell that performs data transmission on a target frequency band and belongs to a cell in the base station, and the fifth subframe in FIG. 4 is a target subframe.
  • the sending module 801 sends the control information to the user equipment through the target frequency band or the non-target frequency band, and the frequency band of the non-target frequency band is different from the frequency band of the target frequency band, for example, the non-target frequency band may be Is the licensed band.
  • the control information may be carried in any subframe within the data transmission burst of the target frequency band, or may be carried in the subframe of the non-target frequency band.
  • the control information may directly indicate the target subframe.
  • the second determining module 901 of the user equipment may determine the target subframe according to the control information; the control information may also indicate the downlink data transmission length of the target subframe, and the second determination The module 901 can determine the downlink data transmission length of the target subframe according to the control information, and compare with the threshold to determine whether the target subframe is a partial subframe.
  • the control information may be carried in a control channel of a target frequency band or a non-target frequency band, or may be carried in a data channel of a target frequency band or a non-target frequency band.
  • the control channel includes at least one of: PDCCH, PCFICH, PHICH, EPDCCH, PBCH, or other control data channel supported by the LTE system; the data channel includes at least one of the following: PDSCH, PMCH, or other service data supported by the LTE system. channel.
  • the sending module 801 only sends the first reference signal in the target time-frequency resource (ie, PSS bit) of the target subframe, or it can be understood that if the target subframe adopts the transmission mode of the DwPTS, the PSS bit includes the PSS.
  • the second determining module 901 may determine whether the target subframe is a target station by detecting whether the PSS bit of each subframe on the target frequency band has a PSS.
  • the second determining module 901 may first determine whether the subframe of the base station in the target frequency band has data transmission, and when determining that the base station has data transmission in the subframe on the target frequency band (correspondingly, the corresponding base station is in the target frequency band) The frame is preempted to the unlicensed band resource, and then the PSS bit of the subframe is detected to include the PSS. If the PSS is included, the subframe is the target subframe.
  • the second determining module 901 determines whether the base station has data transmission in the subframe of the target frequency band, and may be implemented by the sending module 801 to send the indication information, or may be implemented by the second determining module 901, for example, detecting each subframe on the target frequency band.
  • the CRS determines whether the base station has data transmission in the subframe of the target frequency band, and can be implemented by other means, and does not do Specifically limited. It should be noted that the first reference signal can also be used to indicate the downlink data transmission length of the target subframe.
  • the second processing module 902 determines the data transmission feature of the target time-frequency resource in the target subframe according to the preset rule.
  • the preset rule is common to the base station and the user equipment, and the preset rule may be a valid data bearer rule and an indication information bearer.
  • the data transmission feature is used to indicate the type of transmission data that the target time-frequency resource should carry.
  • the transmission data has three types, namely: valid data, first indication information, and second indication information.
  • the valid data includes at least one of service data, control data, and a second reference signal, where the service data includes data carried by at least one of the following channels: PDSCH, PMCH, or other service data channel supported by the LTE system; and the control data includes the following: Data carried by at least one channel: PDCCH, PCFICH, PHICH, EPDCCH, PBC or other control data channel supported by the LTE system; the second reference signal includes at least one of the following: CRS, multimedia broadcast multicast service single frequency network reference signal (Multimedia Broadcast multicast service Single Frequency Network Reference Signal (MBSFN RS), UE-specific Reference Signal (DM-RS) for PDSCH, DeModulation Reference Signal (DM-RS) for EPDCCH ), Positioning Reference Signal (PRS), Channel State Information Reference Signal (CSI-RS), or Discovery Reference Signal (DRS), It should be noted that, in the embodiment of the present invention, any signal included in the DRS may be referred to as DRS, which is distinguished from the prior art, and the PSS is not included in the
  • the first indication information is used to indicate a downlink data transmission length of the target subframe.
  • the second indication information is used to indicate the length of time that the base station does not have downlink data transmission after the target subframe of the target frequency band, that is, the user equipment does not need to detect downlink data transmission of the unlicensed frequency band within this time length. It should be noted that the first indication information and the second indication information may be implemented by means of signaling, or may be implemented by means of sequence detection, and are not specifically limited.
  • the first processing module 702 carries the transmission data to the target time-frequency resource (ie, the PSS bit) according to the data transmission feature. It should be noted that the first processing module 702 can also carry the transmission data on the signal composed of the sequence or sequence, and then The sequence or the sequence of the signal is carried in the target time-frequency resource. Since the sequence form is well-known by the base station and the user equipment, the base station and the user equipment pre-agreed, and one sequence form corresponds to a downlink data length of the target subframe. The user equipment determines the downlink data transmission length of the target subframe according to the sequence of the detected sequence or sequence signal.
  • the sequence uses a sequence that constitutes a PSS, that is, a Zadoff-Chu sequence, which is referred to as a ZC sequence, and a root according to the ZC sequence.
  • Sequence indexing PSS has three manifestations, so three different sequence lengths of PSS signals can be used to represent three different data transmission lengths.
  • the second processing module 902 needs to perform the step of decoding a signal composed of a sequence or a sequence.
  • the target subframe is a partial subframe and uses the data transmission format of the DwPTS, then the target subframe includes the PSS in the PSS bit itself, and the complete subframe does not include the PSS, so the second processing module 902, as long as the PSS is detected in the current subframe of the target frequency band, the current subframe may be determined as the target subframe, and further, the downlink data transmission length of the target subframe may be determined according to the sequence form constituting the PSS.
  • the second determining module 901 may determine the target subframe according to the pre-configuration information, and the pre-configuration information indicates the access network device, in addition to determining the target subframe on the target frequency band according to the detected control information and/or the first reference signal.
  • the maximum time for transmitting data on the target frequency band which is the maximum time range of a data transmission burst of the access network device on the target frequency band.
  • the regulations clearly define a maximum data transmission time of 4 ms; in addition, in Europe, for the use of unlicensed bands, the regulations clearly define a maximum data transmission time of 10 ms or 13 ms or 8 ms.
  • the second determining module 901 can determine the target subframe by considering the pre-configuration information in the target frequency band by determining the starting position of a data transmission burst.
  • the second processing module 902 determines the data transmission feature of the target time-frequency resource in the target subframe according to the preset rule, and acquires the transmission data of the target time-frequency resource according to the data transmission feature.
  • the second processing module 902 determines the transmission data type of the transmission data in the target time-frequency resource according to the preset effective data bearer rule or the indication information bearer rule, so as to be different for the operation performed by the first processing module 901.
  • the data type performs the corresponding operation to obtain the transmission data. If the transmission data is carried on the signal composed of the sequence or the sequence, the signal composed of the sequence or the sequence needs to be decoded to obtain the transmission data.
  • the second processing module 902 can obtain the downlink data transmission length of the target subframe by acquiring the first indication information, which is beneficial to the user equipment to accurately demodulate the data and perform channel quality measurement on the target frequency band. For example, measurement of CSI is performed.
  • the second processing module 902 obtains the second indication information to determine the length of time that the base station does not have downlink data transmission after the target subframe of the target frequency band, and for the LBT rule, the user can be reduced.
  • the number of detections of the device avoids the detection of the unlicensed frequency band in the time range in which the downlink data transmission is impossible, and can save power.
  • the user equipment can implement one of the unlicensed frequency bands or Multiple carriers stop downlink data detection. Specifically, which carriers stop downlink data detection can be notified to the user equipment by the base station.
  • the information content carried by the first indication information and the second indication information may be valid through one carrier on the unlicensed frequency band, or may be valid for multiple carriers, and is not specifically limited.
  • the target time-frequency resource carries valid data, which improves the utilization of the network time-frequency resource.
  • transmission data may also be other data types, and the specific type is not limited herein.
  • the PSS bits in the target subframe are used to carry transmission data, and the use of network time-frequency resources is utilized. It is beneficial.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: ROM, RAM, disk or CD.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé de transmission de données, un dispositif de réseau d'accès, et un équipement d'utilisateur, utilisés pour supporter des données devant être transmises sur une ressource temps-fréquence cible dans une sous-trame cible sur une bande de fréquences cible, de sorte à améliorer le taux d'utilisation des ressources temps-fréquence dans un réseau de communication. Dans certains modes de réalisation de l'invention, le procédé de transmission de données comprend les étapes suivantes : un dispositif de réseau d'accès détermine une sous-trame cible sur une bande de fréquences cible, la bande de fréquences cible étant une bande de fréquences sans licence et la longueur de transmission de données de liaison descendante de la sous-trame cible étant inférieure à un seuil ; le dispositif de réseau d'accès détermine, selon une règle prédéfinie, une caractéristique de transmission de données d'une ressource temps-fréquence cible dans la sous-trame cible, et supporte des données devant être transmises sur la ressource temps-fréquence cible d'après la caractéristique de transmission de données, la ressource temps-fréquence cible désignant la position de signal de synchronisation primaire (PSS) de la sous-trame cible.
PCT/CN2015/094037 2015-11-06 2015-11-06 Procédé de transmission de données, dispositif de réseau d'accès, et équipement d'utilisateur WO2017075822A1 (fr)

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CN109451851B (zh) * 2017-07-31 2022-12-09 北京小米移动软件有限公司 信息确定方法及装置、电子设备和计算机可读存储介质
CN110178430A (zh) * 2018-01-22 2019-08-27 北京小米移动软件有限公司 信息传输方法、装置、系统和存储介质
CN110178430B (zh) * 2018-01-22 2023-11-21 北京小米移动软件有限公司 信息传输方法、装置、系统和存储介质
CN114679404A (zh) * 2022-03-22 2022-06-28 北京邮电大学 一种上行VoLTE用户数量检测方法、装置及设备
CN114679404B (zh) * 2022-03-22 2024-05-14 北京邮电大学 一种上行VoLTE用户数量检测方法、装置及设备

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