WO2017125090A1 - Procédé de transmission de signal de référence, et équipement de réseau - Google Patents

Procédé de transmission de signal de référence, et équipement de réseau Download PDF

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Publication number
WO2017125090A1
WO2017125090A1 PCT/CN2017/072118 CN2017072118W WO2017125090A1 WO 2017125090 A1 WO2017125090 A1 WO 2017125090A1 CN 2017072118 W CN2017072118 W CN 2017072118W WO 2017125090 A1 WO2017125090 A1 WO 2017125090A1
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Prior art keywords
reference signal
network device
tti
ttis
transmitted
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PCT/CN2017/072118
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English (en)
Chinese (zh)
Inventor
张雯
夏树强
戴博
石靖
韩祥辉
梁春丽
张文峰
Original Assignee
中兴通讯股份有限公司
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Publication of WO2017125090A1 publication Critical patent/WO2017125090A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method and network device for transmitting a reference signal.
  • 5G will support higher speed (Gbps), massive link (1M/Km2), ultra-low latency (1ms), higher reliability, and 100 times energy efficiency improvement. Support new changes in demand.
  • Gbps gigabits
  • M/Km2 massive link
  • ultra-low latency is a key indicator of 5G technology, which directly affects the development of time-limited services such as car networking, industrial automation, remote control, and smart grid.
  • a series of current standards for 5G delay reduction are gradually being advanced.
  • the transmission time interval (TTI) is reduced as an important research direction for the current delay reduction.
  • the TTI is reduced to the length of 0.5ms or even 1-2 OFDM symbols, which reduces the minimum scheduling. Time, in turn, can double the single transmission delay without changing the frame structure.
  • 3GPP has established a system design for short TTI in RAN1 and RAN2.
  • the existing LTE reference signal design is no longer suitable, especially in the case of a short TTI length, some TTIs may not have corresponding DMRS.
  • the embodiments of the present invention are directed to a method and a network device for transmitting a reference signal, which at least solves the problems in the prior art and implements reference signal transmission for a short TTI.
  • a method for transmitting a reference signal includes:
  • the reference signal corresponding to one transmission time interval TTI is determined according to a preset manner and/or a manner indicated by the enhanced base station eNB.
  • the method includes:
  • the method further includes:
  • Transmission is performed on a symbol on which the reference signal is located, the reference signal consisting of N sequences, where N is an integer greater than one.
  • the length of the N sequences is a preset length or a length notified by the eNB.
  • the length of the N sequences is determined by at least one of the following:
  • the resource corresponding to the reference signal is the resource corresponding to the reference signal.
  • each of the N sequences has a length of one of the following:
  • R is the number of PRBs corresponding to the reference signal
  • G is the frequency domain scheduling granularity
  • the unit is PRB.
  • k is a positive integer.
  • the method further includes:
  • the reference signal is transmitted on a designated subcarrier in one symbol, which is a preset subcarrier or a subcarrier notified by the eNB.
  • the designated subcarrier is determined by at least one of the following:
  • Radio frame index/subframe index/slot index
  • the method further includes:
  • the reference signals are transmitted on one or more of the overlapping symbols.
  • the method further includes:
  • n TTIs are a group
  • the reference signals of the n TTIs are transmitted on a preset one or more symbols, wherein the n is an integer greater than 1.
  • the n TTIs are all TTIs in one subframe, or all TTIs in one slot.
  • the method further includes:
  • the reference signal is transmitted on the TTI of the transmitted information and on the TTI adjacent to the TTI.
  • the method further includes:
  • the reference signal is transmitted according to a transmission mode and/or a device type or according to an indication of an eNB.
  • the method further includes:
  • the different layers are transmitted by frequency division and code division, or by frequency division.
  • a network device according to an embodiment of the present invention, where the network device includes:
  • the indication mode acquiring unit is configured to acquire a preset manner and/or a manner indicated by the enhanced base station eNB;
  • the signal transmission determining unit is configured to determine a reference signal corresponding to one transmission time interval TTI according to the preset manner and/or the manner indicated by the eNB.
  • the network device further includes:
  • a parsing unit configured to parse information in the TTI according to the reference signal, where the TTI is less than a first threshold.
  • the network device further includes:
  • a signal transmission unit configured to transmit on a symbol on which the reference signal is located, the reference signal being composed of N sequences, where N is an integer greater than one.
  • the length of the N sequences is a preset length or a length notified by the eNB.
  • the length of the N sequences is determined by at least one of the following:
  • the resource corresponding to the reference signal is the resource corresponding to the reference signal.
  • each of the N sequences has a length of one of the following:
  • R is the number of PRBs corresponding to the reference signal
  • G is the frequency domain scheduling granularity
  • the unit is PRB.
  • k is a positive integer.
  • the network device further includes:
  • the reference signal is transmitted on a designated subcarrier in one symbol, which is a preset subcarrier or a subcarrier notified by the eNB.
  • the designated subcarrier is determined by at least one of the following:
  • Radio frame index/subframe index/slot index
  • the network device further includes:
  • the signal transmission unit is configured to transmit the reference signal on one or more of the overlapping symbols when two or more TTIs have overlapping symbols.
  • the network device further includes:
  • the signal transmission unit is configured to transmit, when the n TTIs are a group, the reference signals of the n TTIs are transmitted on a preset one or more symbols, wherein the n is an integer greater than 1.
  • the n TTIs are all TTIs in one subframe, or all TTIs in one slot.
  • the network device further includes:
  • a signal transmission unit configured to transmit, by the network device, the reference signal on a TTI of the transmitted information and on a TTI adjacent to the TTI.
  • the network device further includes:
  • a signal transmission unit configured to transmit, by the network device, the reference signal according to a transmission mode and/or a device type or according to an indication of an eNB.
  • the network device further includes:
  • the signal transmission unit is configured to: when the reference signal includes multiple layers, the different layers are transmitted by using frequency division and code division, or frequency division.
  • the network device includes a terminal or a base station.
  • the indication mode acquisition unit, the signal transmission determination unit, the analysis unit, and the signal transmission unit may use a central processing unit (CPU) and a digital signal processor (DSP, Digital) when performing processing. Singnal Processor) or Field-Programmable Gate Array (FPGA) implementation.
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA Field-Programmable Gate Array
  • a method for transmitting a reference signal includes: determining a reference signal corresponding to a transmission time interval TTI according to a preset manner and/or a manner indicated by the enhanced base station eNB.
  • a reference signal corresponding to a transmission time interval TTI is determined by a network device (terminal or base station) according to a preset manner and/or a manner indicated by the enhanced base station eNB, thereby implementing reference signal transmission for a short TTI.
  • the embodiment of the invention is not limited to the application scenario for short TTI reference signal transmission, and is also applicable to the application scenario of long TTI reference signal transmission.
  • FIG. 1 is a schematic flowchart of an implementation process according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of a network device according to Embodiment 2 of the present invention.
  • 3-7 are schematic diagrams of corresponding reference signals in the first and second TTIs of the application embodiment of the present invention.
  • FIGS. 8-9 are schematic diagrams of corresponding reference signals in a third TTI according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of corresponding reference signals in a TTI according to an application embodiment of the present invention.
  • 11-12 are schematic diagrams of corresponding reference signals in a fifth TTI according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of corresponding reference signals in a sixth TTI according to an embodiment of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 1 A method for transmitting a reference signal according to an embodiment of the present invention is as shown in FIG. 1 , where the method includes:
  • Step 101 The network device determines a reference signal corresponding to one transmission time interval TTI according to a preset manner and/or a manner indicated by the enhanced base station eNB.
  • the network device includes a terminal or a base station.
  • Step 102 Parse information in the TTI according to the reference signal, where the TTI is less than a first threshold.
  • the TTI may be a short transmission time interval, such as less than 12 or 14 symbols
  • the embodiment of the present invention is applicable to an application scenario of short TTI reference signal transmission, and the embodiment of the present invention is not limited to the application for short TTI reference signal transmission.
  • the scenario is also applicable to an application scenario of long TTI reference signal transmission, and the TTI may also be a long transmission time interval, such as 12 or 14 symbols or more.
  • the method further includes:
  • Transmission is performed on a symbol on which the reference signal is located, the reference signal consisting of N sequences, where N is an integer greater than one.
  • the length of the N sequences is a preset length or a length notified by an eNB.
  • the length of the N sequences is determined by at least one of the following:
  • the resource corresponding to the reference signal is the resource corresponding to the reference signal.
  • each of the N sequences has a length of one of the following:
  • R is the number of PRBs corresponding to the reference signal
  • G is the frequency domain scheduling granularity
  • the unit is PRB.
  • k is a positive integer.
  • the number of PRBs is the number of PRBs suitable for the LTE system.
  • the method further includes:
  • the reference signal is transmitted on a designated subcarrier in one symbol, which is a preset subcarrier or a subcarrier notified by the eNB.
  • the designated subcarrier is determined by at least one of the following:
  • Radio frame index/subframe index/slot index
  • the method further includes:
  • the reference signals are transmitted on one or more of the overlapping symbols.
  • the method further includes:
  • n TTIs are a group
  • the reference signals of the n TTIs are transmitted on a preset one or more symbols, wherein the n is an integer greater than 1.
  • the n TTIs are all TTIs in one subframe, or all TTIs in one slot.
  • the method further includes:
  • the network device transmits the reference signal on a TTI that transmits information and on a TTI that is adjacent to the TTI.
  • the method further includes:
  • the network device transmits the reference signal according to a transmission mode and/or a device type or according to an indication of an eNB.
  • the method further includes:
  • the different layers are transmitted by frequency division and code division, or by frequency division.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a network device according to an embodiment of the present invention, as shown in FIG. 2, the network device includes:
  • the indication mode obtaining unit 11 is configured to acquire a preset manner and/or a manner indicated by the enhanced base station eNB; and the signal transmission determining unit 12 is configured to determine according to the preset manner and/or the manner indicated by the eNB.
  • a reference signal corresponding to a transmission time interval TTI; and a parsing unit 13 configured to parse information in the TTI according to the reference signal, the TTI being smaller than a first threshold.
  • the network device further includes:
  • a signal transmission unit configured to transmit on a symbol on which the reference signal is located, the reference signal being composed of N sequences, where N is an integer greater than one.
  • the length of the N sequences is a preset length or a length notified by an eNB.
  • the length of the N sequences is determined by at least one of the following:
  • the resource corresponding to the reference signal is the resource corresponding to the reference signal.
  • each of the N sequences has a length of one of the following:
  • R is the number of PRBs corresponding to the reference signal
  • G is the frequency domain scheduling granularity
  • the unit is PRB.
  • k is a positive integer.
  • the network device further includes:
  • the reference signal is transmitted on a designated subcarrier in one symbol, which is a preset subcarrier or a subcarrier notified by the eNB.
  • the designated subcarrier is determined by at least one of the following:
  • Radio frame index/subframe index/slot index
  • the network device further includes:
  • the signal transmission unit is configured to transmit the reference signal on one or more of the overlapping symbols when two or more TTIs have overlapping symbols.
  • the network device further includes:
  • the signal transmission unit is configured to transmit, when the n TTIs are a group, the reference signals of the n TTIs are transmitted on a preset one or more symbols, wherein the n is an integer greater than 1.
  • the n TTIs are all TTIs in one subframe, or all TTIs in one slot.
  • the network device further includes:
  • a signal transmission unit configured to transmit, by the network device, the reference signal on a TTI of the transmitted information and on a TTI adjacent to the TTI.
  • the network device further includes:
  • a signal transmission unit configured to transmit, by the network device, the reference signal according to a transmission mode and/or a device type or according to an indication of an eNB.
  • the network device further includes:
  • the signal transmission unit is configured to: when the reference signal includes multiple layers, the different layers are transmitted by using frequency division and code division, or frequency division.
  • the network device includes: a terminal or a base station.
  • the application scenarios of the embodiments of the present invention are as follows.
  • the application scenarios are applicable to the transmission scheme of the reference signal in the short TTI.
  • the embodiments of the present invention are applicable not only to the application scenario for short TTI reference signal transmission, but also applicable to the application scenario.
  • the application scenario of long TTI reference signal transmission In the application scenario of long TTI reference signal transmission,
  • This embodiment provides a method of transmitting a reference signal.
  • the method given in this embodiment can be used for uplink or downlink.
  • the reference signal is generated by a plurality of sequences in the frequency domain.
  • the symbol may be an OFDM symbol or an SC-FDMA symbol.
  • the sequence may be a ZC sequence, or other sequences, such as a DFT sequence, a wash sequence, and the like. This embodiment is not limited.
  • the plurality of sequences may be the same or different.
  • the length of the sequences may be the same or different.
  • the DMRS is taken as an example for description. In practical applications, it is not limited to being applied to the DMRS, and may be used for other reference signals.
  • the PUSCH resources allocated to the UE are m PRBs, where m is an even number.
  • the DMRS is occupied by m PRBs, and if the index is 0, 1, 2, ..., m-1, then the DMRS sequence is in the frequency domain.
  • the following two sequences are composed:
  • ⁇ ⁇ is a cyclic shift, among them
  • the number of subcarriers occupied by the PUSCH that is, In the case of resource mapping, the above sequences are mapped to PRB #0 to m/2-1 and m/2 to m-1, respectively.
  • the DMRS sequence consists of two 12 long sequences, the 12 long sequence values being r0, r1, ..., r11.
  • the DMRS is composed of a plurality of fixed length sequences in the frequency domain, and the sequence has a length of M.
  • M is obtained by frequency domain scheduling granularity.
  • the uplink resource allocation granularity is 2 PRBs. If the PUSCH allocated by the eNB to the UE is 6 PRBs, the UE generates a 24-long sequence for every two PRBs in the 6 PRBs starting from the lowest PRB.
  • the DMRS consists of three 24-length ZC sequences in the frequency domain. The three ZC sequences may be the same or different.
  • the DMRS of the two UEs can be orthogonal.
  • the resource allocated by the UE is 2 PRBs
  • the UE generates a sequence in an existing manner, that is, a 24-length sequence.
  • the two TTIs can overlap before and after, and the DMRS is sent on the overlapping symbols, as shown in FIG.
  • Each TTI is 3 symbols, the gray symbols are overlapping symbols, and the DMRS is transmitted on the overlapping symbols.
  • the number of symbols included in the TTI may be any positive integer greater than one and less than 14.
  • the overlap of the two TTIs can reduce the DMRS overhead while reducing the TTI length.
  • the number of symbols of the two TTIs may also be different. For example, one TTI occupies the symbols #0 to 3 of one subframe, and the other TTI occupies the symbols #0 to 6 of the subframe, where the index of the symbol and the existing The definitions in LTE are the same, then the DMRSs of both TTIs can be sent on symbol #3.
  • the DMRSs of the two TTIs are code divisional.
  • the PUSCH of one UE of TTI#0 occupies PRB#0-7
  • TTI#1 The PUSCH of one UE occupies PRB #6-9, and the two overlap on PRB #6 and 7.
  • the DMRSs of the two UEs are two long sequences that occupy the allocated resources, the DMRSs of both PRBs #6 and 7 are non-orthogonal and interfere with each other, affecting the demodulation performance.
  • the DMRS of the UE generates one ZC sequence every 2 PRBs, then on PRBs #6 and 7, the eNB can orthogonalize the DMRSs by assigning different cyclic shifts, and the demodulation performance is good.
  • the length of the sequence is k ⁇ 12 ⁇ p ⁇ G, where p ⁇ 1, 1/2, 1/3, 1/4, 1/6, 1 /12 ⁇ , G is the frequency domain scheduling granularity, the unit is PRB, and k is a positive integer.
  • the length of the sequence may also be determined by the number of PRBs of the transmission information, that is, R ⁇ 12 ⁇ p/k, where p ⁇ 1, 1/2, 1/3, 1/4, 1/6 , 1/12 ⁇ , R is the number of PRBs corresponding to the DMRS.
  • k may be preset or notified by the eNB, such as by RRC signaling or DCI.
  • the eNB notifies the UE of the length information of the sequence.
  • the eNB notifies the UE of 1-bit information. If the bit is "0", the DMRS is a long ZC sequence in the frequency domain, and the sequence length is the number of all sub-carriers allocated to the UE; if the bit is "1"
  • the DMRS is composed of two short ZC sequences in the frequency domain, and each short sequence length is half of the number of all subcarriers allocated to the UE.
  • the eNB may directly indicate the length of the short sequence to the UE, for example, there is a set indicating the size of the PRB corresponding to the short sequence, such as ⁇ 2, 4, 8, 16 ⁇ , indicated by 4 bits.
  • the DMRS is composed of two 8-length ZC sequences.
  • the DMRS consists of an 8 long ZC sequence.
  • ZC sequences of the DMRS constituting the UE may be the same or different, and the ZC sequence is determined by a preset manner, such as determined by a cell identifier. Or it may be that the eNB indicates through RRC signaling or DCI.
  • the DMRS may occupy all allocated resources on one symbol or may not occupy the allocated resources, and the present invention is not limited. For example, there are only 6 REs on each symbol as DMRS, and each 2 PRBs generate a short sequence. The length of the short sequence is 12. If the allocated resource is 4 PRBs, then the DMRS frequency domain is composed of two 12-length. Short sequence composition.
  • the eNB may adopt a 1-bit indication in the DCI or indicate to the UE in the RRC signaling.
  • the DMRS sequence on each TTI can be hopped in a preset manner.
  • This embodiment provides a method for transmitting an uplink DMRS.
  • the two TTIs have a symbol overlap, and the DMRS is transmitted on the overlapping symbols, as shown in FIG.
  • the DMRS sent by the UE only occupies part of the REs in the allocated PUSCH resources. For example, only odd-numbered REs or even-numbered REs are occupied.
  • the DMRSs sent by the UEs on the two TTIs are orthogonal to each other by occupying different subcarriers. For example, the UE of the previous TTI occupies an odd subcarrier, and the UE of the latter TTI occupies an even subcarrier.
  • the number of symbols of the two TTIs may also be different.
  • one TTI occupies the symbols #0 to 3 of one subframe, and the other TTI occupies the symbols #0 to 6 of the subframe, where the index of the symbol and the existing The definitions in LTE are the same, then the DMRSs of both TTIs can be sent on symbol #3.
  • the DMRSs of the two TTIs are frequency divisiond.
  • the location of the subcarrier occupied by the DMRS may be preset, for example, may be determined by an index of the TTI. For an even TTI, an odd subcarrier is occupied, and for an odd TTI, an even subcarrier is occupied.
  • the location of the subcarrier occupied by the DMRS may also be determined by the cell identifier. For example, when the cell identifier is an odd number, for an even TTI, an odd subcarrier is occupied, and for an odd TTI, Occupied by even subcarriers; when the cell identifier is even, for even TTIs, even subcarriers are occupied, and for odd TTIs, odd subcarriers are occupied.
  • the location of the subcarrier occupied by the DMRS may also be determined by the UE identifier. For example, when the UE identifier is an even number, the even subcarrier is occupied, and when the UE identifier is an odd number, the odd subcarrier is occupied.
  • the location of the subcarrier occupied by the DMRS may also be determined by a radio frame index/subframe index/slot index, such as in an odd subframe, for an even TTI, an odd subcarrier is occupied, and for an odd TTI, an occupied Is an even subcarrier.
  • a radio frame index/subframe index/slot index such as in an odd subframe, for an even TTI, an odd subcarrier is occupied, and for an odd TTI, an occupied Is an even subcarrier.
  • even subframes for even TTIs, even subcarriers are occupied, and for odd TTIs, odd subcarriers are occupied.
  • the location of the subcarrier occupied by the UE is notified by the eNB, such as by RRC signaling, or DCI notification.
  • the 1-bit information indicates whether an odd subcarrier or an even subcarrier is occupied.
  • the eNB may further indicate the PRB information corresponding to the odd subcarrier or the even subcarrier, for example, the eNB allocates a PRB of 0 to 5 to the UE, and the eNB may indicate to the UE that the DMRS occupies an odd subcarrier on the PRBs 3 to 5. On PRB #0 ⁇ 2, the default is to occupy all subcarriers.
  • the PRB information may be an index of a starting PRB and an index of a cut-off PRB, that is, PRBs #3 and 5 in the example, or may be represented by an existing RIV value, or may indicate an index of a PRB, and the cut-off PRB is The index of the cutoff PRB assigned to the PUSCH.
  • the subcarrier location of the DMRS on each TTI may be obtained according to at least one of a notified subcarrier location and a TTI index, a cell identity, a UE identity, and a radio frame index/subframe index/slot index.
  • TTI length 2 symbols.
  • the pilot is transmitted on the overlapping symbols of the two TTIs before and after.
  • the thick line frame represents a PRB, and the DMRS is a gray part.
  • the last TTI can overlap with the TTI of the next subframe. Since 14 is not an integer multiple of 3, 3 subframes can occupy the complete frame. 14 TTIs.
  • TTI overlap and non-overlap modes are mixed applications, in one subframe, TTI#0 ⁇ 7 is overlapped by two, TTI#8 and any other TTI are not overlapped, DMRS can monopolize one symbol, and the position of DMRS can be as shown in Figure 6 and Figure 7.
  • DMRS can also occupy part of the subcarriers, and other carriers transmit data.
  • the reference signals of at least two TTIs are transmitted on the same one or more symbols.
  • the method in this embodiment may be used for uplink or downlink.
  • the DMRS of each UE may occupy all REs, and may also occupy part of the RE.
  • the first two symbols are used to transmit the DMRS of all UEs of the subframe.
  • each subframe includes 4 TTIs, and each TTI occupies 3 symbols.
  • the first two symbols are DMRSs for transmitting data in 4 TTIs, and the DMRSs of UEs on 4 TTIs use different OCCs and cyclic shifts, or may occupy different subcarriers.
  • This embodiment is not limited. Only one PRB is shown in the figure, and the other PRBs on the full bandwidth are the same.
  • three time slots contain three TTIs.
  • the DMRSs of the UEs on the three TTIs are all transmitted on the first symbol.
  • This embodiment provides a method of transmitting a reference signal.
  • the above DMRS is taken as an example, and the method can also be applied to the downlink.
  • each layer needs to use one DMRS to distinguish the transmission between different layers.
  • Different layers of DMRS can be transmitted in the following manner.
  • Frequency division between DMRSs of different layers for example, there are 2 layers, and DMRSs transmitted by two layers are transmitted on the same symbol. One layer uses even subcarriers and the other layer uses odd waves. In this case, right The UE's resource allocation is limited. The granularity of resource allocation should be at least 2 PRBs. For another example, there are 4 layers, and the DMRSs of the four layers are alternately transmitted. As shown in Figure 10.
  • Figure 10 is a TTI consisting of 3 symbols, where the DMRS is located in the first symbol, and the numbers 0, 1, 2, and 3 in the RE in the first symbol represent the DMRS of the 4-layer transmission, respectively. In this case, there is a limit to the resource allocation of the UE.
  • the granularity of resource allocation should be at least 4 PRBs.
  • the frequency domain location corresponding to the DMRS transmitted by each layer may be preset, for example, the number of layers and the RE have a fixed mapping relationship, as shown in FIG. 10, or may also be notified by the eNB, such as by RRC signaling or DCI indication.
  • the frequency division and/or code division between different layers for example, there are 4 layers, wherein 2 layers adopt even subcarriers, the other two layers adopt odd subcarriers, and layers adopting the same subcarrier are distinguished by code division.
  • the resource allocation granularity is at least 2 PRBs.
  • This embodiment provides a method of reference signal encryption.
  • the DMRS is taken as an example, and the method can also be applied to the downlink.
  • the UE if the reference signal is not encrypted, the UE only transmits the reference signal in the TTI that transmits the PUSCH; if the reference signal is to be encrypted, the UE needs to send the reference signal in the next TTI or the last TTI.
  • the reference signal is transmitted at the position, so that the density of the reference signal is increased, and the demodulation performance is increased in a high speed or coverage enhanced scene.
  • FIG. 11 A schematic diagram is given in Figure 11.
  • one subframe has a total of 4 TTIs, and each TTI reference signal is transmitted on the first symbol of the TTI.
  • the reference signal is also transmitted on the symbol of the reference signal in the next TTI.
  • the UE in TTI #1 needs reference signal encryption, and the encrypted reference signal is transmitted in the symbol in which the reference signal of TTI #2 is located.
  • the reference signals of the two UEs may be coded or frequency-divided.
  • the UE may perform reference signal encryption according to the indication of the eNB, for example, the eNB notifies the UE to perform reference signal encryption through SIB or RRC signaling or DCI signaling.
  • the UE may perform reference signal encryption according to the transmission mode/UE type, such as when the UE operates in the high speed mode or when the UE is a high speed type UE, then the reference signal is encrypted. If it is a downlink reference signal, the eNB performs reference signal encryption according to the UE's transmission mode/UE type, or notifies the UE to perform reference signal encryption through SIB or RRC signaling or DCI signaling.
  • the additional reference signal sent by the eNB or the UE at the location where the reference signal is sent in the next TTI or the last TTI may be the same as the sequence of the reference signal in the TTI, or may be different, and the cyclic shift may be the same, Can be different.
  • the eNB may inform the sequence and/or cyclic shift of the additionally transmitted reference channel.
  • the UE may further send a reference channel on other symbols of the TTI to further encrypt the reference signal.
  • the UE transmitted on TTI #1 also transmits a reference signal on the symbol of the shaded portion, and the density is further increased.
  • This embodiment provides a method of reference signal encryption.
  • the DMRS is taken as an example, and the method can also be applied to the downlink.
  • the reference signal is transmitted on the symbols overlapped in the two TTIs, as indicated by the gray symbols in FIG.
  • the DMRSs of the UEs on the two TTIs may be frequency-divided or code-divided, which is not limited in this embodiment.
  • the reference channel is encrypted, the reference signal is transmitted on other symbols in the TTI, as in FIG. 13, the UE in TTI #1 also transmits the reference signal in the symbol identified by the slash.
  • the DMRS may occupy the PUSCH resource, or may occupy only a part of the subcarriers, for example, occupy only odd subcarriers, and the data occupies even subcarriers.
  • the notification or preset method of the reference signal encryption is as in the fifth embodiment.
  • the eNB may also inform the UE to transmit the symbol location of the DMRS and/or the density of the transmission.
  • DMRS is sent every 2 REs, or every 4 REs.
  • the integrated modules described in the embodiments of the present invention may also be stored in a computer readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, and a read only memory (ROM, Read-Only Memory), random access memory (RAM), disk or optical disk, and other media that can store program code.
  • ROM Read Only Memory
  • RAM random access memory
  • embodiments of the invention are not limited to any specific combination of hardware and software.
  • an embodiment of the present invention further provides a computer storage medium, wherein a computer program for executing a method for transmitting a reference signal according to an embodiment of the present invention is stored.
  • the reference signal corresponding to one transmission time interval TTI is determined according to a preset manner and/or a manner indicated by the enhanced base station eNB.
  • a reference signal corresponding to a transmission time interval TTI is determined by a network device (terminal or base station) according to a preset manner and/or a manner indicated by the enhanced base station eNB, thereby implementing reference signal transmission for a short TTI.
  • the embodiment of the invention is not limited to the application scenario for short TTI reference signal transmission, and is also applicable to the application scenario of long TTI reference signal transmission.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de transmission d'un signal de référence, et un équipement de réseau. Le procédé comprend les étapes consistant à : déterminer, selon un procédé préconfiguré et/ou un procédé indiqué par un nœud B évolué (eNB), un signal de référence correspondant à un intervalle de temps de transmission (TTI).
PCT/CN2017/072118 2016-01-22 2017-01-22 Procédé de transmission de signal de référence, et équipement de réseau WO2017125090A1 (fr)

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CN109743145B (zh) * 2016-07-13 2021-07-27 上海朗帛通信技术有限公司 一种无线通信中的方法和装置
CN109391442B (zh) * 2017-08-11 2020-12-08 电信科学技术研究院 一种数据传输方法及装置
US10999029B2 (en) 2017-08-11 2021-05-04 Telefonaktiebolaget Lm Ericsson (Publ) Method for transmitting reference signal
JP7100969B2 (ja) * 2017-09-26 2022-07-14 シャープ株式会社 端末装置および基地局装置
CN109587798B (zh) * 2017-09-29 2023-07-14 中兴通讯股份有限公司 参考信号、控制信道单元的确定方法及装置、存储介质

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