WO2018082500A1 - Procédé et dispositif de mappage de pilote - Google Patents

Procédé et dispositif de mappage de pilote Download PDF

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Publication number
WO2018082500A1
WO2018082500A1 PCT/CN2017/107859 CN2017107859W WO2018082500A1 WO 2018082500 A1 WO2018082500 A1 WO 2018082500A1 CN 2017107859 W CN2017107859 W CN 2017107859W WO 2018082500 A1 WO2018082500 A1 WO 2018082500A1
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Prior art keywords
dmrs
resource unit
mapping
different
data channel
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PCT/CN2017/107859
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English (en)
Chinese (zh)
Inventor
林祥利
潘学明
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电信科学技术研究院
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Publication of WO2018082500A1 publication Critical patent/WO2018082500A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • 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

  • the present invention relates to the field of communications technologies, and in particular, to a pilot mapping method and apparatus.
  • TTI transmission time interval
  • sTTI Short Transmission Time Interval
  • each radio frame is composed of a subframe.
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • the frame structure shown in FIG. 1 may be adopted, and the frame structure shown in FIG. 1 may be referred to as a frame structure 1 (Frame).
  • Structure type 1, FS1 In FS1, on each carrier, one radio frame includes 10 1ms subframes, each subframe has two 0.5ms slots, and each slot is fixed by a fixed number of orthogonal frequency division multiplexing ( Orthogonal Frequency Division Multiplexing (OFDM) symbol composition.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the uplink transmission and the downlink transmission use different carrier frequencies, but use the same frame structure, that is, in the LTE FDD system, the TTI duration of the uplink transmission and the downlink transmission is 1 ms.
  • the frame structure shown in FIG. 2 may be employed, and the frame structure shown in FIG. 2 may be referred to as Frame Structure type 2 (FS2).
  • FS2 Frame Structure type 2
  • each 10ms radio frame is composed of two 5ms half frames, and each field contains five subframes with a duration of 1ms.
  • the subframes in the FS2 include a downlink subframe, an uplink subframe, and a special subframe, and each special subframe includes a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an uplink transmission slot.
  • DwPTS Downlink Pilot Time Slot
  • GP Guard Period
  • Uplink Pilot Time Slot, UpPTS is composed of three parts. Each field includes at least one downlink subframe and at least one uplink subframe, and at most one special subframe. In an LTE TDD system, uplink transmissions and downlink transmissions use different subframes or different time slots on the same frequency.
  • a typical working mode of sTTI transmission is to include multiple short TTI transmissions with a duration shorter than 1 ms in the subframe structure defined in the existing LTE mechanism.
  • the downlink transmission supports a short physical downlink shared channel (sPDSCH) and a short physical downlink control channel (sPDCCH).
  • the length of the sTTI can be 2 or 7 OFDM symbols (when However, it is not excluded that the number of other symbols does not exceed 14 or the time domain does not exceed 1 ms.
  • Multiple sPDSCHs, or multiple sPDCCHs, or multiple sPDSCHs and sPDCCH transmissions may be included in one subframe.
  • the control channel and the data channel of the sTTI exist, and the control channel and the data channel of the sTTI need to be based on Demodulation Reference Symbol (DMRS) demodulation.
  • DMRS Demodulation Reference Symbol
  • the traditional LTE system generally demodulates a physical control downlink control channel (PDCCH) based on a cell-specific reference signal (CRS), and the PDCCH is used to carry downlink control information, as above.
  • PDCCH physical control downlink control channel
  • CRS cell-specific reference signal
  • Line scheduling instructions, downlink data transmission indications, common control information, and the like There may be multiple PDCCHs in the control region of each downlink subframe, occupying 1 to 3 OFDM symbols. Therefore, in the current communication network using sTTI, there is no method for demodulating the control channel and the data channel of the sTTI based on the DMRS.
  • the embodiment of the invention provides a pilot mapping method and device, which allocates independent DMRS for the control channel and the data channel of the sTTI, so as to implement DMRS-based demodulation of the control channel and the data channel of the sTTII.
  • a pilot mapping method comprising:
  • the DMRS of the control channel is a first DMRS
  • the DMRS of the data channel is a second DMRS
  • the first DMRS and the second DMRS are independent of each other.
  • the independent demodulation of the control channel and the data channel based on DMRS in a short transmission time interval is realized, and the control is performed.
  • the DMRSs of the channel and data channel mapping are independent of each other, avoiding resource conflicts between the DMRS for data channel demodulation and the DMRS for control channel demodulation, thereby improving channel demodulation performance.
  • mapping the DMRS separately for the control channel and the data channel includes:
  • the second DMRS is mapped in a resource unit belonging to the data area.
  • mapping the DMRS separately for the control channel and the data channel includes:
  • the second DMRS is mapped.
  • the determining the reserved resource unit in the resource unit of the control area includes:
  • mapping the second DMRS includes:
  • the resource unit of the first DMRS mapping is different from the resource unit of the second DMRS mapping.
  • the port number corresponding to the first DMRS is different from the port number of the second DMRS.
  • the number and/or location of resource units mapping the first DMRS are different in different short transmission time intervals; and/or mapping in different short transmission time intervals The number and/or location of resource elements of the two DMRSs are different.
  • the number and location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or mapping the second DMRS in different short transmission time intervals
  • the number and location of resource units are the same.
  • a pilot mapping apparatus has a function of implementing the pilot mapping method involved above, and the function may be implemented by hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the modules can be software and/or hardware.
  • the apparatus comprises:
  • a determining unit is configured to determine a control channel and a data channel to be demodulated within a short transmission time interval.
  • a processing unit configured to separately map a demodulation reference signal DMRS to the control channel and the data channel determined by the determining unit, where a DMRS of the control channel is a first DMRS, and a DMRS of the data channel is a second DMRS, and the first DMRS and the second DMRS are independent of each other.
  • the processing unit separately maps the DMRS for the control channel and the data channel in the following manner:
  • the processing unit separately maps the DMRS for the control channel and the data channel in the following manner:
  • mapping the first DMRS in a resource unit belonging to the control region determining a reserved resource unit in a resource unit of the control region, the reserved resource unit being different from a resource unit mapping the first DMRS; In the reserved resource unit, the second DMRS is mapped.
  • the processing unit is in a resource unit of the control area in the following manner Determine the reserved resource unit:
  • the processing unit maps, in the reserved resource unit, the second DMRS by: mapping, in the reserved resource unit, part of the second DMRS or all Said second DMRS.
  • the resource unit of the first DMRS mapping is different from the resource unit of the second DMRS mapping.
  • the processing unit is different from the port number of the first DMRS and the second DMRS respectively mapped by the control channel and the data channel.
  • the number and/or location of resource units mapping the first DMRS are different in different short transmission time intervals; and/or mapping in different short transmission time intervals The number and/or location of resource elements of the two DMRSs are different.
  • the number and location of resource elements mapping the first DMRS are the same in different short transmission time intervals; and/or mapping the second DMRS in different short transmission time intervals
  • the number and location of resource units are the same.
  • the pilot mapping apparatus may be implemented in a hardware form.
  • the pilot mapping apparatus includes a processor and a memory, and the processor is configured to support the pilot mapping apparatus to perform the foregoing.
  • the pilot mapping apparatus can also include a memory for coupling with a processor that holds the necessary program instructions and data.
  • the independent demodulation of the control channel and the data channel based on DMRS in a short transmission time interval is realized, and the control is performed.
  • the DMRSs of the channel and data channel mapping are independent of each other, avoiding resource conflicts between the DMRS for data channel demodulation and the DMRS for control channel demodulation, thereby improving channel demodulation performance.
  • 1 is a frame structure in an LTE system
  • FIG. 3 is a flowchart of mapping a DMRS to a control channel and a data channel in an sTTI according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of mapping DMRS to a control channel and a data channel in an sTTI according to an embodiment of the present invention. Another flow chart;
  • FIG. 5 is still another flowchart of mapping a DMRS to a control channel and a data channel in an sTTI according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a DMRS resource mapping pattern of a data channel and a control channel according to an embodiment of the present invention
  • FIG. 7 is another schematic diagram of a DMRS resource mapping pattern of a data channel and a control channel according to an embodiment of the present invention.
  • FIG. 8 is still another schematic diagram of a DMRS resource mapping pattern of a data channel and a control channel according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a pilot mapping apparatus according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of still another pilot mapping apparatus according to an embodiment of the present invention.
  • the embodiment of the invention provides a pilot mapping method, which maps independent DMRSs for control channels and data channels in the sTTI to implement DMRS-based demodulation of control channels and data channels in the sTTI.
  • the pilot mapping method described in this embodiment of the present invention can be applied to an LTE system, or other wireless communication system adopting various radio access technologies, and can also be applied to a subsequent evolution system using an LTE system, such as a fifth generation 5G system. Wait.
  • LTE system or other wireless communication system adopting various radio access technologies
  • a subsequent evolution system using an LTE system such as a fifth generation 5G system. Wait.
  • LTE system such as a fifth generation 5G system.
  • Embodiments of the Invention may be a network device (for example, a base station).
  • FIG. 3 is a flowchart of a method for mapping a pilot according to an embodiment of the present invention. As shown in FIG. 3, the method includes:
  • S101 Determine a control channel and a data channel to be demodulated in the sTTI.
  • a control channel and a data channel to be demodulated may be determined by a network device (for example, a base station).
  • the length of the sTTI is 7 OFDM symbols in the LTE system
  • the control region and the data region exist in an sTTI having a length of 7 OFDM symbols
  • the resources of the control region are mainly used for transmitting the control channel and the data region.
  • the resources are mainly used to transmit data channels. Resources that are not used to transmit control channels in the control region can also be used to transport data channels.
  • a network device for example, a base station
  • the DMRS is mapped for the control channel and the data channel, respectively.
  • the DMRS mapped for the control channel is recorded as a first DMRS
  • the DMRS mapped for the data channel is recorded as a second DMRS
  • the first DMRS and the DMRS are The second DMRSs are independent of each other.
  • FIG. 4 is a flowchart of an implementation process for mapping a DMRS to the control channel and the data channel in an sTTI according to an embodiment of the present invention. As shown in FIG. 4, the method includes:
  • the above resource unit may be an OFDM symbol.
  • the following describes an example in which the resource unit is an OFDM symbol as an example.
  • the length of the sTTI is 7 OFDM symbols, and the control region and the data region exist in an sTTI having a length of 7 OFDM symbols.
  • the first DMRS of the control channel in the sTTI may be mapped to the resource unit of the control region, and the second DMRS of the data channel in the sTTI is mapped into the resource unit of the data region.
  • FIG. 5 is a flowchart of an implementation process of mapping a DMRS to the control channel and the data channel in an sTTI according to an embodiment of the present invention. As shown in FIG. 5, the method includes:
  • S301 Map the first DMRS in a resource unit belonging to the control area.
  • S302 Determine a reserved resource unit in a resource unit of the control area, where the reserved resource unit is different from a resource unit that maps the first DMRS.
  • the reserved resource unit may be determined in the resource unit of the control area according to a predetermined rule.
  • the reserved resource unit may be determined by one or several of the following ways.
  • the reserved resource unit determined in the resource unit of the control area is different from the resource list that maps the CRS.
  • the reserved resource unit determined in the resource unit of the control area in the embodiment of the present invention may be determined according to a resource element that is pre-mapped to the second DMRS, and the resource of the second DMRS is pre-mapped
  • the unit is determined to be a reserved resource unit.
  • the reserved resource unit determined in the resource unit of the control area in the embodiment of the present invention is not used to map the resource unit of the sPDCCH.
  • the number of reserved resource units determined in the embodiment of the present invention is not limited, and may be determined according to the specific mapping of the number of second DMRSs. In the embodiment of the present invention, a part of the second DMRS may be mapped in the reserved resource unit, or all the second DMRS may be mapped in the reserved resource unit.
  • the resource unit of the first DMRS mapping and the mapping of the second DMRS in the embodiment of the present invention is different.
  • the port number corresponding to the first DMRS in the embodiment of the present invention is different from the port number of the second DMRS.
  • the mapping of the first DMRS and the mapping of the second DMRS may be different.
  • the number of resource units of the first DMRS is mapped and/or Or the location can be different.
  • the number and/or location of resource elements mapping the second DMRS may also be different.
  • the patterns of mapping the first DMRS and mapping the second DMRS may be the same.
  • mapping the number of resource units of the first DMRS and The location can be the same.
  • the number and location of resource elements mapping the second DMRS may also be the same.
  • the control channel and the data channel are demodulated in the sTTI, independent demodulation of the control channel and the data channel based on DMRS in the sTTI is implemented, and the control channel and the data channel are mapped.
  • the DMRSs are independent of each other, avoiding resource conflicts between the DMRS for data channel demodulation and the DMRS for control channel demodulation, thereby improving channel demodulation performance.
  • the LTE system is taken as an example.
  • the sTTI is 7 OFDM symbols in length, and one radio bearer (Radio Bearer, RB) or 12 subcarriers is used as a unit in the frequency domain.
  • Radio Bearer Radio Bearer, RB
  • the legacy downlink control region (Legacy PDCCH) occupies the first two OFDM symbols of the subframe, and the Common Reference Signal (CRS) occupies four ports.
  • the common reference signal can also be referred to as a common pilot. It is assumed that the control region of the sTTI occupies the first two OFDM symbols except the legacy control region.
  • FIG. 6 is a schematic diagram of a resource mapping pattern mapping a first DMRS and a second DMRS in an embodiment of the present invention.
  • the first DMRS occupies the 2nd, 6th, and 12th subcarrier positions in the frequency domain.
  • the first DMRS occupies the 3rd and 4th OFDM symbol positions on the time domain on the first time slot.
  • the first DMRS occupies the first and second OFDM symbol positions on the time domain on the second time slot, and uses a port number that is completely different from the second DMRS for the data channel.
  • the second DMRS occupies the sixth and seventh OFDM symbol positions in the time domain within the sTTI.
  • the 2nd, 7th, and 12th subcarrier positions are occupied in the frequency domain.
  • the second DMRS occupies the 3rd, 4th, 6th, and 7th OFDM symbol positions in the time domain within the sTTI, and occupies the 2nd and 8th subcarrier positions in the frequency domain.
  • the reserved resource unit of the control region is used to map the DMRS of the data channel, and a port number that is completely different from the first DMRS for the control channel is used.
  • FIG. 7 is a diagram showing another resource mapping pattern mapping the first DMRS and the second DMRS in the embodiment of the present invention. intention.
  • the first DMRS occupies the 2nd, 7th, and 12th subcarrier positions in the frequency domain.
  • the first DMRS occupies the 3rd and 4th OFDM symbol positions on the time domain on the first time slot.
  • the first DMRS occupies the first and second OFDM symbol positions on the time domain on the second time slot, and uses a port number that is completely different from the second DMRS for the data channel.
  • the selected reserved resource unit in the sTTI control region of the first slot, is the 4th and 10th subcarrier positions in the frequency domain, and the 3rd and 4th OFDM symbol positions in the time domain.
  • the reserved resource unit is not selected in the sTTI control region of the second time slot.
  • the second DMRS occupies the 3rd, 4th, 6th, and 7th OFDM symbol positions in the time domain in the sTTI, in the frequency domain. Occupies the 4th, 10th subcarrier position.
  • the reserved resource unit of the control region is used to map the DMRS of the data channel, and a port number that is completely different from the first DMRS for the control channel is used.
  • FIG. 8 is a schematic diagram of still another resource mapping pattern mapping the first DMRS and the second DMRS in the embodiment of the present invention.
  • the first DMRS occupies the 2nd, 7th, and 12th subcarrier positions in the frequency domain.
  • the first DMRS occupies the 2nd and 3rd OFDM symbol positions on the time domain on the first time slot.
  • the first DMRS occupies the first and second OFDM symbol positions on the time domain on the second time slot, and uses a port number that is completely different from the second DMRS for the data channel.
  • the selected reserved resource unit in the sTTI control region of the first slot, is the 3rd and 9th subcarrier positions in the frequency domain, and the third OFDM symbol position in the time domain.
  • the reserved resource unit is not selected in the sTTI control region of the second time slot.
  • the second DMRS occupies the 3rd, 4th, 6th, and 7th OFDM symbol positions in the time domain in the sTTI, in the frequency domain. Occupies the 3rd and 9th subcarrier positions.
  • the reserved resource unit of the control region is used to map the second DMRS of the data channel, and a port number that is completely different from the first DMRS for the control channel is used.
  • a pilot mapping apparatus is further provided in the embodiment of the present invention.
  • the principle of solving the problem is similar to the functional method performed by the network device in the pilot mapping method shown in the foregoing embodiment and the accompanying drawings. Therefore, the implementation of the device can be referred to the implementation of the method, and the repeated description will not be repeated.
  • a pilot mapping apparatus comprising: a determining unit 101 and a processing unit 102.
  • the determining unit 101 is configured to determine a control channel and a data channel to be demodulated in the sTTI.
  • the processing unit 102 is configured to separately map the demodulation reference signal DMRS to the control channel and the data channel determined by the determining unit 101, where the DMRS of the control channel is a first DMRS, and the data channel
  • the DMRS is a second DMRS, and the first DMRS and the second DMRS are independent of each other.
  • the processing unit 102 specifically maps the DMRS to the control channel and the data channel in the sTTI in the following manner:
  • the processing unit 102 specifically maps the DMRS to the control channel and the data channel in the sTTI in the following manner:
  • mapping the first DMRS in a resource unit belonging to the control region determining a reserved resource unit in a resource unit of the control region, the reserved resource unit being different from a resource unit mapping the first DMRS; In the reserved resource unit, the second DMRS is mapped.
  • the processing unit 102 determines a reserved resource unit in a resource unit of the control area in the following manner:
  • the processing unit 102 maps the second DMRS in the reserved resource unit by mapping a part of the second DMRS or all the locations in the reserved resource unit. Said second DMRS.
  • the resource unit of the first DMRS mapping is different from the resource unit of the second DMRS mapping.
  • the processing unit 102 is different from the port number of the first DMRS and the second DMRS respectively mapped by the control channel and the data channel.
  • mapping resource elements of the second DMRS are different.
  • the number and location of resource units mapping the first DMRS are the same; and/or in different sTTIs, mapping the number of resource units of the second DMRS and Or the same location.
  • the pilot mapping device may be a network device
  • the hardware structure and processing of the pilot mapping device provided by the embodiment of the present invention are taken as an example of the following by using the pilot mapping device as a network device. The way to explain.
  • the pilot mapping apparatus includes a processor 1001 and a memory 1002.
  • the memory 1002 is configured to store program code executed by the processor 1001.
  • the processor 1001 is configured to call the program code stored in the memory 1002 to implement the following functions:
  • the DMRS of the control channel is a first DMRS
  • the DMRS of the data channel is a second DMRS
  • the first DMRS and the second DMRS are independent of each other.
  • the processor 1001 specifically maps the DMRS to the control channel and the data channel in the sTTI in the following manner:
  • the processor 1001 specifically maps the DMRS to the control channel and the data channel in the sTTI in the following manner:
  • mapping the first DMRS in a resource unit belonging to the control region determining a reserved resource unit in a resource unit of the control region, the reserved resource unit being different from a resource unit mapping the first DMRS; In the reserved resource unit, the second DMRS is mapped.
  • the processor 1001 determines a reserved resource unit in a resource unit of the control area in the following manner:
  • the processor 1001 maps the second DMRS in the reserved resource unit by mapping a part of the second DMRS or all the locations in the reserved resource unit. Said second DMRS.
  • the resource unit of the first DMRS mapping is different from the resource unit of the second DMRS mapping.
  • the first DMRS that the processor 1001 maps to the control channel and the data channel is different from the port number of the second DMRS.
  • mapping resource elements of the second DMRS are different.
  • the number and location of resource elements mapping the first DMRS are the same; and/or in different sTTIs, the number and or location of resource elements mapping the second DMRS are the same.
  • DMRSs are independent of each other, avoiding DMRS for data channel demodulation and for control channel demodulation Resource conflicts in the DMRS, thereby improving channel demodulation performance.
  • the network device is not limited to the above structure, for example, the network device may also include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all networks that can implement the embodiments of the present invention The devices are all within the protection scope of the embodiments of the present invention.
  • pilot mapping apparatus and the network device may be used to implement the corresponding functions of the pilot mapping method in the foregoing method embodiments of the embodiments of the present invention, and thus the description of the embodiments of the present invention is not detailed enough.
  • description refer to the description of the related method embodiments, and details are not described herein again.
  • the processor involved in the foregoing embodiments of the present invention may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

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Abstract

L'invention concerne un procédé et un dispositif de mappage de pilote, le procédé consistant à : déterminer un canal de commande et un canal de données à démoduler dans un intervalle de temps de transmission court (sTTI), et mapper respectivement des signaux de référence de démodulation (DMRS) pour le canal de commande et le canal de données dans le sTTI, le DMRS du canal de commande étant un premier DMRS, le DMRS du canal de données étant un second DMRS, et le premier DMRS et le second DMRS étant indépendants l'un de l'autre. La présente invention met en œuvre une démodulation à base de DMRS d'un canal de commande et d'un canal de données par l'attribution de DMRS indépendants au canal de commande et au canal de données.
PCT/CN2017/107859 2016-11-04 2017-10-26 Procédé et dispositif de mappage de pilote WO2018082500A1 (fr)

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