CN111132221B - Method and apparatus for transmitting reference signal - Google Patents

Method and apparatus for transmitting reference signal Download PDF

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CN111132221B
CN111132221B CN201811292729.5A CN201811292729A CN111132221B CN 111132221 B CN111132221 B CN 111132221B CN 201811292729 A CN201811292729 A CN 201811292729A CN 111132221 B CN111132221 B CN 111132221B
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target
prs
mapping
value
index value
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CN111132221A (en
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史桢宇
王艺
黄甦
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • H04W28/0263—Traffic management, e.g. flow control or congestion control per individual bearer or channel involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]
    • 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
    • H04L5/003—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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • 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
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies

Abstract

The application provides a method for transmitting reference signals, which comprises the following steps: generating a Positioning Reference Signal (PRS) sequence; mapping a PRS sequence onto a target symbol in a target slot, wherein the target symbol comprises a plurality of continuous symbols after a symbol carrying a control signal in the target slot, and the length of the PRS sequence is
Figure DDA0001850339020000011
Figure DDA0001850339020000012
Is the total number of resource blocks RB allocated for downlink transmission, NREThe number of target Resource Elements (REs) carrying PRS for one target symbol in each RB; and sending the PRS sequence to the user equipment UE on the target RE. The method for transmitting the reference signal can realize effective utilization of transmission resources and more accurate positioning.

Description

Method and apparatus for transmitting reference signal
Technical Field
The present application relates to the field of communications, and more particularly, to a method and apparatus for transmitting reference signals.
Background
In wireless communication systems, positioning has been an important feature in the third Generation Partnership Project (3 GPP).
The positioning technologies mainly used in the Long Term Evolution (LTE) system include enhanced cell-ID (E-CID) positioning technology and observed time difference of arrival (OTDOA) positioning technology. Based on the definition of TS36.211 in the LTE system, signals mapped to a User Equipment (UE) on one transmission slot (slot) in the LTE system include a Positioning Reference Signal (PRS) and a cell-specific reference signal (CRS) for positioning. Wherein, the PRS and the CRS exist simultaneously in one slot.
However, CRS is weakened in New Radio (NR) systems, and therefore, in NR systems, it is necessary to provide a new method for transmitting PRS so that efficient utilization of transmission resources can be achieved by transmitting PRS based on the method.
Disclosure of Invention
The application provides a method for transmitting reference signals, which can realize effective utilization of transmission resources and more accurate positioning.
In a first aspect, a method for transmitting a reference signal is provided, where the method is performed by a network device and includes: generating a Positioning Reference Signal (PRS) sequence; mapping a PRS sequence onto a target symbol in a target slot, wherein the target symbol comprises a plurality of continuous symbols after a symbol carrying a control signal in the target slot, and the length of the PRS sequence is
Figure BDA0001850337000000011
Figure BDA0001850337000000012
Is the total number of resource blocks RB allocated for downlink transmission, NREThe number of target Resource Elements (REs) carrying PRS for one target symbol in each RB; and sending a PRS sequence to the user equipment UE on the target RE.
Therefore, the PRS is carried on a plurality of continuous symbols after a symbol which carries a control signal (e.g., a Physical Downlink Control Channel (PDCCH)) in one RB, so that all continuous symbols after the symbol which carries the control signal in one RB carry the PRS, thereby realizing effective utilization of transmission resources.
In one possible implementation, mapping the PRS sequence onto a target symbol within a target slot includes:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000021
Figure BDA0001850337000000022
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000023
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
When 14 symbols (symbol #0 to symbol #13) are included in one target slot, values in the PRS sequence are mapped to symbol #3 to symbol #13 in one target slot, so that the PRS sequence is mapped to a plurality of consecutive symbols following the symbol carrying the control signal, thereby achieving effective utilization of transmission resources.
In one possible implementation, mapping the PRS sequence onto a target symbol within a target slot includes:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000024
Figure BDA0001850337000000025
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000026
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
When 14 symbols (symbol #0 to symbol #13) are included in one target slot, values in the PRS sequence are mapped to symbol #3 to symbol #13 in one target slot, so that the PRS sequence is mapped to a plurality of consecutive symbols following the symbol carrying the control signal, thereby achieving effective utilization of transmission resources.
In one possible implementation, mapping the PRS sequence onto a target symbol within a target slot includes:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000027
Figure BDA0001850337000000028
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000029
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
When 12 symbols (symbol #0 to symbol #11) are included in one target slot, values in the PRS sequence are mapped to symbol #3 to symbol #11 in one target slot, so that the PRS sequence is mapped to a plurality of consecutive symbols following the symbol carrying the control signal, thereby achieving effective utilization of transmission resources.
In one possible implementation, the vshiftThe following formula is satisfied:
Figure BDA00018503370000000210
wherein the content of the first and second substances,
Figure BDA00018503370000000211
for the PRS identity, C1Is constant, and can take at least 0, 1, 2, 3,4, or 5, for example. .
In one possible implementation, mapping the PRS sequence onto a target symbol within a target slot includes:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000031
Figure BDA0001850337000000032
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000033
number k of RBs for carrying PRS1,init、k2,initRepresentative of on frequencyOffset over field, k1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftAn integer greater than or equal to 0.
When mapping the PRS sequence, the PRS sequence is mapped using a comb mapping pattern that coincides with a DMRS mapping pattern by taking into account a flexible mapping pattern of demodulation reference signals (DMRSs): two target symbols are selected in the target time slot, and values in the PRS sequence are mapped on target REs on the two selected target symbols, so that the effective utilization of transmission resources is realized on the basis of better combination with mapping patterns of other signals in an NR system.
Alternatively, fshiftCan be expressed as:
Figure BDA0001850337000000034
wherein, C2Is constant, and can take at least 0, 1, 2, 3, or 4, for example.
In one possible implementation, mapping the PRS sequence onto a target symbol within a target slot includes:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000035
Figure BDA0001850337000000036
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000037
is the number of RBs used to carry PRS. k is a radical of1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftAn integer greater than or equal to 0.
When the PRS sequence is mapped, taking the flexible mapping pattern of the DMRS into account, the PRS sequence is mapped by adopting the comb mapping pattern consistent with the DMRS mapping pattern: two target symbols are selected in the target time slot, and values in the PRS sequence are mapped on target REs on the two selected target symbols, so that the effective utilization of transmission resources is realized on the basis of better combination with mapping patterns of other signals in an NR system.
Alternatively, fshiftCan be expressed as:
Figure BDA0001850337000000038
wherein, C3Is constant, and can take at least 0, 1, 2, or 3, for example.
In a second aspect, there is provided a communication device comprising means for performing the method of the first aspect or any possible implementation manner of the first aspect.
In a third aspect, a communication apparatus is provided, which may be a network device designed by the method described above, or a chip disposed in the network device. The communication device includes: a processor, coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the network device in the first aspect and any one of the possible implementations. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.
When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.
When the communication device is a chip provided in a network device, the communication interface may be an input/output interface.
Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.
In a fourth aspect, a program is provided, which, when being executed by a processor, is adapted to carry out the method of any of the first aspect and its possible embodiments.
In a fifth aspect, a program product is provided, the program product comprising: program code which, when executed by a transceiver unit, a processing unit or a transceiver, a processor of a communication apparatus (e.g. a network device), causes the communication apparatus to perform the method of the first aspect and any of its possible embodiments.
In a sixth aspect, a computer-readable storage medium is provided, which stores a program that causes a communication apparatus (e.g., a network device) to perform the method of any one of the above first aspect and its possible embodiments.
Drawings
Fig. 1 is a schematic system architecture diagram according to an embodiment of the present application.
Fig. 2 is a mapping pattern of a PRS sequence within one RB in a conventional method.
Fig. 3 is a schematic flowchart of a method for transmitting a reference signal according to an embodiment of the present disclosure.
Fig. 4 is a mapping pattern of a PRS sequence in an RB according to an embodiment of the present disclosure.
Fig. 5 is another mapping pattern of a PRS sequence in an RB according to an embodiment of the present disclosure.
Fig. 6 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present disclosure.
Fig. 7 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present disclosure.
Fig. 8 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present disclosure.
Fig. 9 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present application.
Fig. 10 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present application.
Fig. 11 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present application.
Fig. 12 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present application.
Fig. 13 is a diagram of another mapping pattern of a PRS sequence in an RB according to an embodiment of the present application.
Fig. 14 is a schematic block diagram of an apparatus for transmitting reference signals according to an embodiment of the present application.
Fig. 15 is a schematic structural diagram of an apparatus for transmitting a reference signal according to an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
The technical scheme of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) systems, General Packet Radio Service (GPRS), Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD), universal mobile telecommunications system (universal mobile telecommunications system, UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, future fifth generation mobile communication systems (5 generation mobile networks, etc.), or new NR 5 networks (new NR 5) systems.
A User Equipment (UE) in the embodiments of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The UE may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a UE in a future 5G network or a UE in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment.
The network device in this embodiment may be a device for communicating with a UE, and the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved base station (NB, NodeB) in an LTE system, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay station, an access point, a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, and the like, and the present embodiment is not limited.
In an embodiment of the present application, a UE or a network device includes a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided in the embodiment of the present application, as long as the communication can be performed according to the method provided in the embodiment of the present application by running the program recorded with the code of the method provided in the embodiment of the present application, for example, the execution main body of the method provided in the embodiment of the present application may be a UE or a network device, or a functional module capable of calling the program and executing the program in the UE or the network device.
Fig. 1 is a schematic diagram of an application scenario according to an embodiment of the present application. In a wireless communication system as shown in fig. 1, the communication system 100 includes a network device 102, and the network device 102 may include 1 antenna or multiple antennas, e.g., antennas 104, 106, 108, 110, 112, and 114. Additionally, network device 102 can additionally include a transmitter chain and a receiver chain, each of which can comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.
Network device 102 may communicate with multiple UEs (e.g., UE116 and UE 122). However, it is understood that network device 102 may communicate with any number of UEs similar to UE116 or UE 122. The UEs 116 and 122 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over the wireless communication system 100.
As shown in fig. 1, UE116 is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to UE116 over a forward link (also called a downlink) 118 and receive information from UE116 over a reverse link (also called an uplink) 120. In addition, UE122 is in communication with antennas 104 and 106, where antennas 104 and 106 transmit information to UE122 over forward link 124 and receive information from UE122 over reverse link 126.
In a Frequency Division Duplex (FDD) system, forward link 118 may utilize a different frequency band than reverse link 120, and forward link 124 may employ a different frequency band than reverse link 126, for example.
As another example, in Time Division Duplex (TDD) systems and Full Duplex (Full Duplex) systems, forward link 118 and reverse link 120 may utilize a common frequency band and forward link 124 and reverse link 126 may utilize a common frequency band.
Each antenna (or group of antennas consisting of multiple antennas) and/or area designed for communication is referred to as a sector of network device 102. For example, antenna groups may be designed to communicate to UEs in a sector of the area covered by network device 102. The network device may transmit signals to all UEs in its corresponding sector through single-antenna or multi-antenna transmit diversity. During communication of network device 102 with UEs 116 and 122 over forward links 118 and 124, respectively, the transmitting antennas of network device 102 may also utilize beamforming to improve signal-to-noise ratio of forward links 118 and 124. Moreover, mobile devices in neighboring cells may experience less interference when network device 102 utilizes beamforming to transmit to UEs 116 and 122 scattered randomly through an associated coverage area, as compared to a manner in which the network device transmits signals to all of its UEs through single-antenna or multi-antenna transmit diversity.
At a given time, network device 102, UE116, or UE122 may be a wireless communication transmitting apparatus and/or a wireless communication receiving apparatus. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmitting device may acquire (e.g., generate, receive from another communication device, or save in memory, etc.) a number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks.
In addition, the communication system 100 may be a PLMN network, a D2D network, an M2M network, or other networks, and fig. 1 is a simplified schematic diagram for example, and other network devices may be included in the network, which are not shown in fig. 1.
A brief introduction will first be made to a conventional method of transmitting PRS.
Fig. 2 shows a mapping pattern of PRS carried in one Resource Block (RB), and besides CRS is carried in the RB, and the mapping pattern of CRS in the RB is as shown in fig. 2.
However, since the CRS is weakened in the current NR system, the resources originally used for transmitting the CRS may be idle, for example, the symbol with reference number 4 (symbol #4), symbol #7 and symbol #11 in fig. 2 are not used for transmitting the CRS in the NR system, which is idle, and thus is not favorable for efficient utilization of the transmission resources and is also not favorable for more accurate positioning measurement using the positioning reference signal.
In view of this, embodiments of the present application provide a method for transmitting a PRS, where the PRS is carried on a plurality of consecutive symbols after a symbol in one RB that carries a control signal (e.g., a Physical Downlink Control Channel (PDCCH)), so that all consecutive symbols after the symbol in the RB that carries the control signal carry the PRS, thereby achieving effective utilization of transmission resources.
Fig. 3 is a schematic flow chart of a method 200 for transmitting a reference signal according to an embodiment of the present disclosure. The UE depicted in fig. 3 may be UE116 or UE122 in fig. 1; the network device may be network device 102 in fig. 1. Of course, in an actual system, the number of network devices and UEs may not be limited to the example of this embodiment or other embodiments, and will not be described below. The method 200 includes at least the following steps.
S201, generating a Positioning Reference Signal (PRS) sequence.
S202, mapping the PRS sequence to a target symbol in the target time slot, wherein the target symbol comprises a plurality of continuous symbols after the symbol carrying the control signal in the target time slot, and the length of the PRS sequence is
Figure BDA0001850337000000071
Figure BDA0001850337000000072
Is the total number of resource blocks RB allocated for downlink transmission, NREThe number of target resource elements REs carrying PRS for one target symbol within each RB.
Specifically, the network device first generates a PRS sequence before transmitting the PRS sequence to the UE, where the length of the PRS sequence generated by the network device is
Figure BDA0001850337000000073
Figure BDA0001850337000000074
Is the total number of resource blocks RB allocated by the network equipment for downlink transmission, NREThe number of target Resource Elements (REs) carrying PRS on one target symbol in each RB, wherein the number of RBs capable of carrying PRS in the RBs allocated by the network equipment for the UE can be recorded as
Figure BDA0001850337000000075
For example, the total number of RBs allocated by the network device for downlink transmission is
Figure BDA0001850337000000076
Among the 100 RBs are
Figure BDA0001850337000000077
PRSs can be carried by one RB, and the number of REs (e.g., target REs) carrying PRSs on one symbol (e.g., target symbol) within each RB for carrying PRSs is 2 (N)RE＝2)。
It should be understood that this is just an example, and it is also possible to select one RE out of 100 RBs to carry a PRS sequence every 4 RBs. The present application is not limited to the specific embodiments.
Taking the above assumption as an example, the network device may generate a PRS sequence with a length of 200, select a PRS sequence with a length of 120 from the PRS sequences with a length of 200, and map the PRS sequence with a length of 120 to 120 REs on one target symbol.
It should be noted that, the above is described by taking an example that the network device generates one PRS sequence and maps the generated one PRS sequence to a target RE on one target symbol, in fact, when a slot (e.g., a target slot) in which the target symbol is located includes a plurality of target symbols capable of mapping PRSs, for example, 11 target symbols capable of mapping PRSs are included in the target slot, the network device may generate 11 PRS sequences, sequentially map PRSs in the generated 11 sequences to target REs on the 11 target symbols, and each PRS sequence occupies 120 REs. For the method for the network device to generate the 11 PRS sequences and sequentially map the PRSs in the generated 11 sequences to the target REs on the 11 target symbols, please refer to the above related description, and for brevity, details are not repeated here.
It should be understood that the same PRS sequence may also be placed on different target symbols, i.e., one PRS sequence is repeatedly transmitted on different target symbols. In yet another implementation, the same PRS sequence may also be mapped to REs on different target symbols. The specific mapping method of the PRS sequence to the symbol is not limited in the present application. In the following, one PRS sequence is mapped to one target symbol, and different target symbols carry different PRSs for example, which is not described again, but it should not be understood that the following embodiments limit the mapping manner from the PRS sequence to the target symbol.
S203, sending PRS sequence to the UE on the target RE.
Specifically, after the network device completes mapping of the generated PRS sequence to the target RE, the network device sends the PRS sequence to the UE.
In the following, taking mapping the generated PRS sequence in one RB as an example, a specific implementation manner for the network device to map the generated PRS sequence to the target RE is described in detail.
Mode 1
Mapping the PRS sequence onto a target symbol within a target slot, comprising:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000078
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000079
is the number of RBs used to carry PRS.
V in formula (1)shiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0 and can be represented as:
Figure BDA0001850337000000081
wherein, C1Is constant, and can take at least 0, 1, 2, 3,4, or 5, for example.
Specifically, the network device first generates a PRS sequence, which may be a Golden sequence, a zadoff-Chu sequence, or other random sequence, and the embodiments of the present application are not limited in particular.
For example, the PRS sequence may be generated by a root sequence factor, which may be expressed as:
Figure BDA0001850337000000082
wherein the content of the first and second substances,
Figure BDA0001850337000000083
represents a PRS ID, or represents other IDs defined by upper layers (e.g., cell ID or Transmission and Reception Point (TRP) ID, etc.), nsIndex value representing target slot, index value representing target symbol, NCPIs a Cyclic Prefix (CP) flag, when N isCPWhen 1, it indicates normal cp (normal cp), and when one slot includes 14 symbols, when N isCPWhen being equal to 0, representsExtended cp, when 12 symbols are included in a slot.
For example, when N isCP＝1，
Figure BDA0001850337000000084
NREWhen 2, l is 3, 4.., 13, the network device sequentially generates 11 PRS sequences with a length of 200 according to equation (3), selects a PRS sequence with a length of 120 from each PRS sequence, and sequentially maps values in the 11 sets of PRS sequences onto target REs on corresponding target symbols according to equation (1).
Wherein, m' in the formula (1) is an index value corresponding to the value mapped to the target RE in the PRS sequence with the length of 200, and m is an index value corresponding to the value mapped to the target RE in the PRS sequence with the length of 120.
When l, m', m,
Figure BDA0001850337000000085
vshiftWhen the values of l and k are all determined, the network device may determine, according to equation (1), the frequency domain position k of the target RE corresponding to the mapped value with the index value m ', and map the value with the index value m' on the target RE indicated by l and k according to the values of l and k.
FIG. 4 shows that when NCPWhen the mapping pattern of the mapped PRS sequence in one RB is equal to 1 according to equation (1), it can be seen that two target REs on each target symbol in symbol #3 to symbol #13 carry a value in the PRS sequence, where two values mapped on one target symbol are all spaced by 6 REs.
As can be further seen from fig. 4, in the embodiment of the present application, symbol #0 to symbol #2 in the target timeslot can be used to carry a control signal (e.g., PDCCH).
Mode 2
Mapping the PRS sequence onto a target symbol within a target slot, comprising:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000086
Figure BDA0001850337000000087
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000088
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer of 0 or more, and can be represented by formula (2).
Specifically, for example, when NCP＝1，
Figure BDA0001850337000000089
NREWhen 2, l is 3, 4.., 13, the network device sequentially generates 11 PRS sequences with a length of 160 according to equation (2), selects a PRS sequence with a length of 80 from each PRS sequence, and sequentially maps values in the 11 sets of PRS sequences onto target REs on corresponding target symbols according to equation (4).
Wherein symbol #3 to symbol #6 in the target timeslot are expressed by the following formula (4)
Figure BDA0001850337000000091
The values in the PRS sequence are mapped, and symbol #7 to symbol #14 in the target slot are mapped in accordance with the formula (4)
Figure BDA0001850337000000092
A mapping of values in the sequence is performed.
M' in equation (4) is an index value corresponding to the value mapped to the target RE in the PRS sequence having the length of 120, and m is an index value corresponding to the value mapped to the target RE in the PRS sequence having the length of 80.
When l, m', m,
Figure BDA0001850337000000093
vshiftIn the case that the values of (a) are all determined, the network device may determine, according to equation (4), the frequency domain position k of the target RE corresponding to the mapped value with the index value m ', and map the value with the index value m' on the target RE indicated by l and k according to the values of l and k.
FIG. 5 shows that when NCPWhen the mapped PRS sequence is mapped in one RB according to equation (4), it can be seen that two target REs on each target symbol in symbol #3 to symbol #13 carry a value in the PRS sequence, where the two values mapped on one target symbol are all spaced by 6 REs.
As can be further seen from fig. 5, in the embodiment of the present application, symbol #0 to symbol #2 in the target timeslot can be used to carry a control signal (e.g., PDCCH).
It should be noted that, please refer to the related description in the manner 1 for the method for generating the PRS sequence by the network device, and details are not repeated here for brevity.
Mode 3
Mapping the PRS sequence onto a target symbol within a target slot, comprising:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000094
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000095
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer of 0 or more, and can be represented by formula (2).
Specifically, for example, when NCP＝0，
Figure BDA0001850337000000096
NREWhen 2, l is 3, 4.., 11, the network device sequentially generates 9 PRS sequences with a length of 180 according to equation (2), selects a PRS sequence with a length of 120 from each PRS sequence, and sequentially maps values in the 9 sets of PRS sequences onto target REs on corresponding target symbols according to equation (5).
Where m' in equation (5) is an index value corresponding to the value mapped to the target RE in the PRS sequence having the length of 180, and m is an index value corresponding to the value mapped to the target RE in the PRS sequence having the length of 120.
When l, m', m,
Figure BDA0001850337000000097
vshiftIn the case that the values of (a) are all determined, the network device may determine, according to equation (5), the frequency domain position k of the target RE corresponding to the mapped value with the index value m ', and map the value with the index value m' on the target RE indicated by l and k according to the values of l and k.
FIG. 6 shows that when NCPWhen the mapping pattern of the mapped PRS sequence in one RB is equal to 0 according to equation (5), it can be seen that two target REs on each target symbol in symbol #3 to symbol #11 carry a value in the PRS sequence, where two values mapped on one target symbol are all spaced by 6 REs.
As can also be seen from fig. 6, in the embodiment of the present application, symbol #0 to symbol #2 in the target timeslot can be used to carry a control signal (e.g., PDCCH).
It should be noted that, please refer to the related description in the manner 1 for the method for generating the PRS sequence by the network device, and details are not repeated here for brevity.
It should be further noted that the mapping patterns of the PRS given in the above modes 1 to 3 are only exemplary illustrations and do not constitute any limitation to the embodiments of the present application, and any scheme for mapping the PRS on a plurality of consecutive symbols after the symbol carrying the control signal falls within the scope of the present application.
In addition to the above-mentioned manners 1 to 3 for mapping PRS, the embodiments of the present application provide several other manners for mapping PRS, which are described in detail below.
Mode 4
Mapping the PRS sequence onto a target symbol within a target slot, comprising:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000101
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000102
is the number of RBs used to carry PRS.
K in formula (6)1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftIntegers greater than or equal to 0 can be represented as:
Figure BDA0001850337000000103
wherein, C2Is constant, and can take at least 0, 1, 2, 3, or 4, for example.
Specifically, the network device generates a PRS sequence, selects two target symbols in a target timeslot when mapping PRS in the target timeslot, and maps values in the PRS sequence on target REs on the two selected target symbols.
The network device may map N on a target symbol within an RBREValue in a sequence, NRECan be 1, 2, 3,4, 6 or 12.
For example, when N isCP＝1，
Figure BDA0001850337000000104
NREWhen the PRS sequence is 6, l is 3,4, 13, the network device sequentially generates 11 PRS sequences with a length of 300 according to equation (2), selects a PRS sequence with a length of 180 from each PRS sequence, and sequentially maps values in the 11 sets of PRS sequences onto target REs on corresponding target symbols according to equation (6).
Where m' in equation (6) is an index value corresponding to the value mapped to the target RE in the PRS sequence having the length of 300, and m is an index value corresponding to the value mapped to the target RE in the PRS sequence having the length of 180.
When l, m', m,
Figure BDA0001850337000000105
k1,init、k2,init、fshiftIn the case that the values of (a) are all determined, the network device may determine, according to equation (6), the frequency domain position k of the target RE corresponding to the mapped value with the index value m ', and map the value with the index value m' on the target RE indicated by l and k according to the values of l and k.
FIG. 7 shows that when NCPWhen the mapping pattern within one RB of the mapped PRS sequence is equal to 1 according to equation (6), it can be seen that 6 target REs in symbol #4 and symbol #9 each carry a value in the PRS sequence, where any two adjacent values mapped on one target symbol are separated by 1 RE. As can also be seen in FIG. 7, k1,initAnd k is2,initThe difference between the two values is 1.
In mode 4, k1,initAnd k is2,initCan also be equal when k1,initAnd k is2,initIf N is equal to each otherRE6, according to equation (6), the mapped PRS sequence has a mapping pattern within one RBAs shown in fig. 8.
In mode 4, if N RE12, according to equation (6), the mapping pattern of the mapped PRS sequence in one RB is as shown in fig. 9, where k is1,initAnd k is2,initMay or may not be equal.
As can also be seen from fig. 7 to 9, in the embodiment of the present application, symbol #0 to symbol #2 in the target timeslot can be used to carry a control signal (e.g., PDCCH).
It should be noted that, please refer to the related description in the manner 1 for the method for generating the PRS sequence by the network device, and details are not repeated here for brevity.
Mode 5
Mapping the PRS sequence onto a target symbol within a target slot, comprising:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000111
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000112
is the number of RBs used to carry PRS.
K in formula (8)1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftIntegers greater than or equal to 0 can be represented as:
Figure BDA0001850337000000113
wherein the content of the first and second substances,C3is constant, and can take at least 0, 1, 2, or 3, for example.
Specifically, the network device generates a PRS sequence, selects two target symbols in a target timeslot when mapping PRS in the target timeslot, and maps PRS on target REs on the two selected target symbols.
The network device may map N on a target symbol within an RBREPRS, NRECan be 1, 2, 3,4, 6 or 12.
For example, when N isCP＝0，
Figure BDA0001850337000000114
N RE6, l is 3, 4.., 13, the network device sequentially generates 9 PRS sequences with a length of 240 according to equation (2), selects a PRS sequence with a length of 120 from each PRS sequence, and sequentially maps values in the 9 sets of PRS sequences onto target REs on corresponding target symbols according to equation (8).
Where m' in equation (9) is an index value corresponding to the value S mapped to the target RE in the PRS sequence having the length of 240, and m is an index value corresponding to the value S mapped to the target RE in the PRS sequence having the length of 120.
When l, m', m,
Figure BDA0001850337000000115
k1,init、k2,init、fshiftIn the case that the values of (a) are all determined, the network device may determine, according to equation (9), the frequency domain position k of the target RE corresponding to the mapped value with the index value m ', and map the value with the index value m' on the target RE indicated by l and k according to the values of l and k.
FIG. 10 shows that when NCP＝0，NREWhen the mapped PRS sequence is mapped to a mapping pattern within one RB according to equation (8), it can be seen that 6 target REs in symbol #4 and symbol #8 carry values in the PRS sequence, where any two adjacent values mapped to one target symbol are separated by 1 RE. As can also be seen in FIG. 10, k1,initAnd k is2,initThe values of (A) are the same.
FIG. 11 shows that when NCP＝0，NREWhen the mapping pattern of the mapped PRS sequence in one RB is 12, according to equation (8), it can be seen that 12 target REs in symbol #4 and symbol #8 both carry values in the PRS sequence. At this time, k1，initAnd k is2，initMay be equal or may not be equal.
In mode 5, when N isCP＝1，NRE＝6，k1,initAnd k is2,initWhen the values of (a) and (b) are equal, according to equation (8), the mapping pattern of the mapped PRS sequence in one RB is as shown in fig. 12.
In mode 5, when N isCP＝1，NREAs shown in fig. 13, according to equation (8), the mapping pattern of the mapped PRS sequence in one RB is shown. At this time, k1,initAnd k is2,initMay be equal or may not be equal.
As can also be seen from fig. 10 to 13, in the embodiment of the present application, symbol #0 to symbol #2 in the target timeslot can be used to carry a control signal (e.g., PDCCH).
It should be noted that, please refer to the related description in the manner 1 for the method for generating the PRS sequence by the network device, and details are not repeated here for brevity.
In the embodiments 4 and 5, when mapping the PRS sequence, the PRS sequence is mapped using a comb mapping pattern that matches a DMRS mapping pattern by taking into account a flexible mapping pattern of a demodulation reference signal (DMRS): two target symbols are selected in the target time slot, and values in the PRS sequence are mapped on target REs on the two selected target symbols, so that the effective utilization of transmission resources is realized on the basis of better combination with mapping patterns of other signals in an NR system.
It should also be noted that the mapping patterns of the PRS given in the above-mentioned modes 4 to 5 are only exemplary illustrations and do not constitute any limitation to the embodiments of the present application, and any scheme that maps the PRS on two symbols that are spaced apart in the time domain after a symbol carrying a control signal falls within the protection scope of the present application.
It should be further noted that, in the embodiment of the present application, when mapping a PRS sequence, different cells may be distinguished by a time domain offset between target REs on any two target symbols carrying the PRS sequence, or different cells may be distinguished by a frequency domain offset between target REs on any two target symbols carrying the PRS sequence.
For example, when the time domain offset between target REs on two target symbols carrying PRS sequences is 1, it represents that the PRS sequences carried on the two target symbols are from different cells. When the frequency domain offset between target REs on two target symbols carrying PRS sequences is 1, it represents that the PRS sequences carried on the two target symbols are from different cells.
It should be noted that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The method for transmitting the reference signal according to the embodiment of the present application is described in detail above with reference to fig. 1 to 13. An apparatus for transmitting a reference signal according to an embodiment of the present application will be described below with reference to fig. 14 and 15. It should be understood that the technical features described in the method embodiments are equally applicable to the following apparatus embodiments.
Fig. 14 shows a schematic block diagram of an apparatus 300 for transmitting reference signals according to an embodiment of the present application. The apparatus 300 is configured to perform the method performed by the network device in the foregoing method embodiment. Alternatively, the specific form of the apparatus 300 may be a chip in a network device. The embodiments of the present application do not limit this. The apparatus 300 comprises:
a processing module 301, configured to generate a positioning reference signal PRS sequence;
the processing module 301 is further configured to: mapping PRS sequences onto target symbols within a target slot, the target symbols including the targetA plurality of continuous symbols after the symbol carrying the control signal in the time slot, wherein the PRS sequence has the length of
Figure BDA0001850337000000121
Figure BDA0001850337000000122
Is the total number of resource blocks RB allocated for downlink transmission, NREThe number of target Resource Elements (REs) carrying PRS for one target symbol in each RB;
a transceiver module 302, configured to send a PRS sequence to a user equipment UE on the target RE.
Optionally, the processing module 301 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000131
Figure BDA0001850337000000132
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000133
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
Optionally, the processing module 301 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000134
Figure BDA0001850337000000135
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000136
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
Optionally, the processing module 301 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000137
Figure BDA0001850337000000138
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000139
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
Optionally, said vshiftThe following formula is satisfied:
Figure BDA00018503370000001310
wherein the content of the first and second substances,
Figure BDA00018503370000001311
for the PRS identity, C1Is a constant.
Optionally, the processing module 301 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA00018503370000001312
Figure BDA00018503370000001313
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA00018503370000001314
number k of RBs for carrying PRS1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftAn integer greater than or equal to 0.
Alternatively, fshiftCan be expressed as:
Figure BDA00018503370000001315
wherein, C2Is constant, and can take at least 0, 1, 2, 3, or 4, for example.
Optionally, the processing module 301 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000141
Figure BDA0001850337000000142
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000143
is the number of RBs used to carry PRS. k is a radical of1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftAn integer greater than or equal to 0.
Alternatively, fshiftCan be expressed as:
Figure BDA0001850337000000144
wherein, C3Is constant, and can take at least 0, 1, 2, or 3, for example.
It should be understood that the apparatus for transmitting a reference signal according to the embodiment of the present application may correspond to the method of the network device in the foregoing method embodiment, for example, the method in fig. 2, and the above and other management operations and/or functions of each module in the apparatus 300 are respectively for implementing corresponding steps of the method of the network device in the foregoing method embodiment, so that beneficial effects in the foregoing method embodiment may also be implemented, and for brevity, no repeated description is provided here.
It should also be understood that the various modules in the apparatus 300 may be implemented in software and/or hardware, and are not particularly limited in this regard. In other words, the apparatus 300 is presented in the form of a functional module. As used herein, a "module" may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the described functionality. Alternatively, in a simple embodiment, one skilled in the art will recognize that the device 300 may take the form shown in FIG. 15. The processing module 301 may be implemented by a processor 401 and a memory 402 as shown in fig. 15. The transceiver module 302 may be implemented by a transceiver 403 shown in fig. 15. In particular, the processor is implemented by executing a computer program stored in the memory. Alternatively, when the apparatus 300 is a chip, then the functions and/or implementation procedures of the transceiver module 302 can also be implemented by pins or circuits, etc. Optionally, the memory is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the computer device, such as the memory 402 shown in fig. 15.
Fig. 15 is a schematic block diagram illustrating an apparatus 400 for transmitting a reference signal according to an embodiment of the present application. As shown in fig. 15, the apparatus 400 includes: a processor 401.
In one possible implementation, the processor 401 is configured to generate a positioning reference signal, PRS, sequence; mapping a PRS sequence onto a target symbol in a target slot, wherein the target symbol comprises a plurality of continuous symbols after a symbol carrying a control signal in the target slot, and the length of the PRS sequence is
Figure BDA0001850337000000145
Figure BDA0001850337000000146
Is the total number of resource blocks RB allocated for downlink transmission, NREThe number of target Resource Elements (REs) carrying PRS for one target symbol in each RB;
the processor 401 is further configured to invoke an interface to perform the following actions: and sending a PRS sequence to the user equipment UE on the target RE.
Optionally, the processor 401 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000147
Figure BDA0001850337000000148
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000149
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
Optionally, the processor 401 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000151
Figure BDA0001850337000000152
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000153
for the number of RBs used to carry PRS, vshiftRepresenting an offset in the frequency domain,vshiftis an integer greater than or equal to 0.
Optionally, the processor 401 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000154
Figure BDA0001850337000000155
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m after mapping,
Figure BDA0001850337000000156
for the number of RBs used to carry PRS, vshiftRepresenting the offset, v, in the frequency domainshiftIs an integer greater than or equal to 0.
Optionally, the processor 401 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA0001850337000000157
Figure BDA0001850337000000158
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA0001850337000000159
for carryingNumber k of RBs of PRS1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftAn integer greater than or equal to 0.
Alternatively, fshiftCan be expressed as:
Figure BDA00018503370000001510
wherein, C2Is constant, and can take at least 0, 1, 2, 3, or 4, for example.
Optionally, the processor 401 is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure BDA00018503370000001511
Figure BDA00018503370000001512
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure BDA00018503370000001513
is the number of RBs used to carry PRS. k is a radical of1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftAn integer greater than or equal to 0.
Alternatively, fshiftCan be expressed as:
Figure BDA0001850337000000161
wherein, C3Is constant, and can take at least 0, 1, 2, or 3, for example.
It should be understood that the processor 401 may call an interface to perform the sending action, where the called interface may be a logical interface or a physical interface, and the embodiment of the present application is not limited thereto. Alternatively, the physical interface may be implemented by a transceiver. Optionally, the apparatus 400 may further comprise a transceiver 403.
Optionally, the apparatus 400 further includes a memory 402, where the program code in the above method embodiments may be stored in the memory 402, so as to be called by the processor 401.
Specifically, if the apparatus 400 includes a processor 401, a memory 402 and a transceiver 403, the processor 401, the memory 402 and the transceiver 403 communicate with each other via internal connection paths to transmit control and/or data signals. In one possible design, the processor 401, the memory 402, and the transceiver 403 may be implemented by chips, and the processor 401, the memory 402, and the transceiver 403 may be implemented in the same chip, or may be implemented in different chips, or any two functions may be combined and implemented in one chip. The memory 402 may store program code, which the processor 401 calls to implement the respective functions of the apparatus 400, stored by the memory 402.
It should be understood that the apparatus 400 may also be used to perform other steps and/or operations on the network device side in the foregoing embodiments, and details are not described herein for brevity.
It should be understood that the processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a Digital Signal Processor (DSP), a Micro Controller Unit (MCU), a programmable logic controller (PLD), or other integrated chip. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
It will also be appreciated that the memory referred to in this embodiment of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.
It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A method of transmitting reference signals, the method being performed by a network device and comprising:
generating a Positioning Reference Signal (PRS) sequence;
mapping a PRS sequence to a target symbol in a target time slot, wherein the target symbol is two symbols which have intervals in a time domain after a symbol which carries a control signal in the target time slot, and the length of the PRS sequence is
Figure FDA0003071438180000011
Figure FDA0003071438180000012
Is the total number of resource blocks RB allocated for downlink transmission, NREThe number of target Resource Elements (REs) carrying PRS for one target symbol in each RB;
and sending a PRS sequence to the user equipment UE on the target RE.
2. The method of claim 1, wherein mapping the PRS sequence onto a target symbol in a target slot comprises:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure FDA0003071438180000013
Figure FDA0003071438180000014
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure FDA0003071438180000015
for the number of RBs used to carry PRS, k1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and smallIs equal to or greater than (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftIs an integer greater than or equal to 0.
3. The method of claim 1, wherein mapping the PRS sequence onto a target symbol in a target slot comprises:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure FDA0003071438180000016
Figure FDA0003071438180000017
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure FDA0003071438180000018
for the number of RBs used to carry PRS, k1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftIs an integer greater than or equal to 0.
4. The method of claim 2, wherein f isshiftThe following formula is satisfied:
Figure FDA0003071438180000019
wherein the content of the first and second substances,
Figure FDA00030714381800000110
is identified by PRS, C2Is a constant.
5. The method of claim 3, wherein f isshiftThe following formula is satisfied:
Figure FDA00030714381800000111
wherein the content of the first and second substances,
Figure FDA00030714381800000112
is identified by PRS, C3Is a constant.
6. An apparatus for transmitting a reference signal, comprising:
a processing module for generating a Positioning Reference Signal (PRS) sequence;
the processing module is further configured to: mapping a PRS sequence to a target symbol in a target time slot, wherein the target symbol is two symbols which have intervals in a time domain after a symbol which carries a control signal in the target time slot, and the length of the PRS sequence is
Figure FDA0003071438180000021
Figure FDA0003071438180000022
Is the total number of resource blocks RB allocated for downlink transmission, NREThe number of target Resource Elements (REs) carrying PRS for one target symbol in each RB;
a transceiver module, configured to send a PRS sequence to a user equipment UE on the target RE.
7. The apparatus of claim 6, wherein the processing module is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure FDA0003071438180000023
Figure FDA0003071438180000024
wherein l is the index value of the target symbol where the target RE corresponding to the value with the index value m 'is located after mapping, k is the frequency domain position of the target RE corresponding to the value with the index value m' after mapping,
Figure FDA0003071438180000025
for the number of RBs used to carry PRS, k1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftIs an integer greater than or equal to 0.
8. The apparatus of claim 6, wherein the processing module is further configured to:
mapping the value with the index value m' in the PRS sequence to the target RE on the target symbol based on the following formula:
Figure FDA0003071438180000026
Figure FDA0003071438180000027
wherein l is the index value of the target symbol where the target RE corresponding to the mapped value with index value m' is located, and k is the mapped value with index value mThe frequency domain location of the corresponding target RE,
Figure FDA0003071438180000028
for the number of RBs used to carry PRS, k1,init、k2,initRepresenting the offset, k, in the frequency domain1,init、k2,initAre all greater than or equal to 0 and less than or equal to (12/N)RE-1) integer, fshiftRepresenting an offset in the time domain, fshiftIs an integer greater than or equal to 0.
9. The apparatus of claim 7, wherein fshiftThe following formula is satisfied:
Figure FDA0003071438180000029
wherein the content of the first and second substances,
Figure FDA00030714381800000210
is identified by PRS, C2Is a constant.
10. The apparatus of claim 8, wherein f isshiftThe following formula is satisfied:
Figure FDA00030714381800000211
wherein the content of the first and second substances,
Figure FDA00030714381800000212
is identified by PRS, C3Is a constant.
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