CN108391311A - NB-IoT equipment localization method and device - Google Patents
NB-IoT equipment localization method and device Download PDFInfo
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- CN108391311A CN108391311A CN201810018095.8A CN201810018095A CN108391311A CN 108391311 A CN108391311 A CN 108391311A CN 201810018095 A CN201810018095 A CN 201810018095A CN 108391311 A CN108391311 A CN 108391311A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Abstract
The present invention provides a kind of NB IoT equipment localization method and devices.Wherein, a kind of NB IoT equipment localization methods：In each time slot, location reference signals PRS from NB IoT equipment is distributed in a time/frequency source block RB corresponding to the time slot, so that PRS is present in 5 OFDM symbols in 10 subcarriers on frequency domain direction in continuous 12 subcarriers and on time domain direction in continuous 7 OFDM symbols；Resource particle RE comprising PRS is merged into a PRS symbol, then PRS symbols are 12 subcarriers on frequency domain, are in the time domain an OFDM symbol；Time delay, which is carried out, according to the PRS symbols after merging estimates TDE；Under the premise of keeping being concerned with TDE, the jump distribution PRS in different time slots；The resource particle comprising PRS of different frequency hopping points is merged into a frequency hopping FH symbol, so that the frequency band between different frequency hopping points broadens, then the range performance of the relevant TDE of the FH symbols after merging accordingly enhances；It is positioned according to the relevant TDE of FH symbols.
Description
Technical field
The present invention relates to the field of locating technology of narrowband physics network termination, in particular to a kind of NB-IoT (Narrow
Band Internet of Things, NB-IoT) equipment positioning method, a kind of NB-IoT equipment positioning device.
Background technology
In recent years, flourishing with technology of Internet of things, various technical standards and reality based on different application scene
Scheme is applied to put into effect and attain in maturation successively.Typical standard has eMTC, LoRa, NB-IoT, Sigfox etc..Wherein, NB-IoT is marked
It is accurate to be considered of less demanding to time delay various because having many advantages, such as extensively covering, big connection, low cost, low-power consumption, and power consumption
It is required that as low as possible, the numerous occasion of connection terminal has good application prospect.
3GPP is in existing NB-IoT standards Release 13 and the relevant specification of not specified positioning.Due to location information
Communication performance can be improved, relevant part may propose in Release 14.Preliminary target may be indoor and outdoor 50
The positioning accuracy of rice.Since the system bandwidth of NB-IoT only has 240khz, the bandwidth compared to LTE highests 20Mhz is small very much,
This for dense multi-path environments, particularly need using calculate step-out time (Time-Difference of Arrival,
TDoA method) will face prodigious test when positioning.
Relative to LTE, the available resources of NB-IoT are limited, and the complexity of equipment reduces, at this stage means used for positioning
It is limited to enhancement type district mark E-CID (Enhanced Cell ID), step-out time observation OTDoA (Observed Time
Difference of Arrival) and uplink step-out time UTDoA (Uplink Time Difference of Arrival)
Three kinds of methods.Among being studied using the scheme of up channel progress UTDoA narrow band detections.NB-IoT is used in OTDoA
Traditional location reference signals PRS (Positioning Reference Signal, PRS), and specify distribution at one
Narrowband PRS (NPRS) in frequency gridding resource block RB (Resource Block, RB).
In urban environment, due to there is the obstruction of the presence of multipath, multipath reflection and base station and equipment room to using TDoA
Positioning proposes prodigious challenge.In order to reduce ranging deviation, it is necessary to try every possible means to eliminate the influence of multipath.However, NB-IoT is set
The standby signal bandwidth because of extremely low power consumption requirements and very little makes the use of these technologies be very restricted.Therefore necessary
Reduce the complexity of algorithm.
In addition, low cost, high battery efficiency are vital for IoT equipment.In general, the electricity of NB-IoT equipment
It pond will be with 10 years or so lengths of service.The sides RF are first required to use (the sampling of NB-IoT of lower signal sampling rate in this way
Rate is 1.92Mbps), two come in order to reduce the PRS signal interferences of minizone, can't in Physical Downlink Shared Channel PDSCH
Send positioning sub-frame.Nevertheless, due to the presence of time delay (time-delays), the PRS signals that each cell is come still have very by force
Interference, cause based on time of arrival (toa) location algorithm TOA (Time Of Arrival, TOA) detection performance decline.Certainly,
PRS silences can to avoid signal conflict, but while linearly increase the delay of related cell position fixing process, therefore for cell
It is when intensive and infeasible.In addition to inter-cell interference, frequency deviation FO (Frefency Offset) also based on synchronous estimation is simultaneously endless
U.S. causes remaining frequency deviation, this can also cause the performance of the related operation in ToA detection process to decline.
In general, whether people are more than some by the first peak value for detecting computing cross-correlation (receiving signal and pilot signal)
Threshold value does ranging estimation.This estimator is used for the performance evaluation to OTDoA by 3GPP because of its low computation complexity.Base
In the estimator of thresholding, limited performance is in non line of sight (NLoS) condition and to the processing of multipath reflection.It is unsatisfactory for line of sight conditions
It will cause ranging deviation, this estimator that cannot offset this influence.
Therefore, how to propose a kind of algorithm of moderate complexity, influenced caused by positioning based on multipath is reduced, and to the greatest extent
Interference declines with performance caused by residual frequency deviation between amount avoids PRS, becomes a technical problem to be solved urgently.
Invention content
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, it is an aspect of the invention to propose a kind of NB-IoT equipment localization method.
Another aspect of the present invention is to propose a kind of NB-IoT equipment positioning device.
In view of this, the present invention proposes a kind of NB-IoT equipment localization method, including：In each time slot, it will come from
The location reference signals PRS of NB-IoT equipment is distributed in a time/frequency source block RB corresponding to the time slot, so that PRS exists
Continuous 7 OFDM symbols in 10 subcarriers in continuous 12 subcarriers on frequency domain direction and on time domain direction
In 5 OFDM symbols in；Resource particle RE comprising PRS is merged into a PRS symbol, then PRS symbols are on frequency domain
It is in the time domain an OFDM symbol for 12 subcarriers；Time delay, which is carried out, according to the PRS symbols after merging estimates TDE；It is keeping
Under the premise of relevant TDE, the jump distribution PRS in different time slots；The resource particle comprising PRS of different frequency hopping points is merged
Into frequency hopping FH (Frequency Hopping, a FH) symbol, so that the frequency band between different frequency hopping points broadens, then merge
The range performance of the relevant TDE of FH symbols afterwards accordingly enhances；It is positioned according to the relevant TDE of FH symbols.
NB-IoT equipment localization method according to the present invention, first by the location reference signals PRS from NB-IoT equipment
It distributes in a time/frequency source block RB corresponding to the time slot, the resource particle RE comprising PRS is merged into a symbol,
One is formed on frequency domain comprising the PRS symbols for including an OFDM symbol on 12 subcarriers and time domain.In single RB
In, the PRS symbols after combination so that the peak value of sighting distance LoS (Line of Sight, LoS) related operation can accurately be known
Not, to obtain accurate time delay estimation TDE (Time Delay Estimation, TDE).In addition, keeping being concerned with TDE's
Under the premise of, by location reference signals PRS of the arrangement from NB-IoT equipment that jump between different time-gap and subcarrier, and individually
RB is the same, and the resource particle RE comprising PRS of different frequency hopping points is combined as a symbol, equally improves signal bandwidth,
The relevant TDE of the frequency hopping FH symbols combined, because the bandwidth between frequency hopping point broadens, range performance is also enhanced.
It means that if FH narrow band signals are distributed in broader bandwidth, even if essence can be reached if in intensive multi-path environment
True ranging estimation.
In the above-mentioned technical solutions, it is preferable that further include：In each time slot, by cell reference signals CRS distribution not
In the resource particle Chong Die with the time domain where PRS.
In the technical scheme, cell reference signals CRS is arranged in resource particle not Chong Die with the time domain where PRS
In, so that cell reference signals CRS is existed independently of each other with location reference signals, to avoid mutual interference and remnants as possible
Frequency deviation causes the performance of the related operation in ToA detection process to decline, while avoiding the delay of related cell position fixing process.
In any of the above-described technical solution, it is preferable that be divided into Fsc=15khz between subcarrier.
In any of the above-described technical solution, it is preferable that the period of OFDM symbol is Ts=1/Fsc=66.7us.
In any of the above-described technical solution, it is preferable that between the range performance of the relevant TDE of FH symbols and different frequency hopping points
Bandwidth positive correlation.
In the technical scheme, the resolution ratio of multipath reflection depends on signal bandwidth, and bandwidth is higher, and identification is higher, such as
Fruit is that then the effect is relatively poor by TDE for narrow band signal.By rational hopping scheme energy widening frequency band in different RB, combined
Frequency hopping FH symbols relevant TDE because the bandwidth between frequency hopping point broadens, range performance is also enhanced, to obtain
Obtain better range performance.
The invention also provides a kind of NB-IoT equipment positioning devices, including：First allocation unit, in each time slot
In, the location reference signals PRS from NB-IoT equipment is distributed in a time/frequency source block RB corresponding to time slot, so that
PRS is present in 10 subcarriers on frequency domain direction in continuous 12 subcarriers and continuous 7 on time domain direction
In 5 OFDM symbols in OFDM symbol；Assembled unit, for will include that the resource particle RE of PRS is merged into a PRS symbol
In, then PRS symbols are 12 subcarriers on frequency domain, are in the time domain an OFDM symbol；Computing unit, for according to merging
PRS symbols afterwards carry out time delay and estimate TDE；Allocation unit is additionally operable under the premise of keeping being concerned with TDE, in different time slots
Middle jump distributes PRS；Assembled unit is additionally operable to the resource particle comprising PRS of different frequency hopping points being merged into a frequency hopping FH
In symbol, so that the frequency band between different frequency hopping points broadens, then the range performance of the relevant TDE of the FH symbols after merging accordingly increases
By force；Positioning unit, for being positioned according to the relevant TDE of FH symbols.
NB-IoT equipment positioning device according to the present invention, first by the location reference signals PRS from NB-IoT equipment
It distributes in a time/frequency source block RB corresponding to the time slot, the resource particle RE comprising PRS is merged into a symbol,
One is formed on frequency domain comprising the PRS symbols for including an OFDM symbol on 12 subcarriers and time domain.In single RB
In, the PRS symbols after combination so that the peak value of LoS related operations can be accurately identified, to obtain accurate time delay estimation
TDE (Time Delay Estimation, TDE).In addition, under the premise of keeping being concerned with TDE, by different time-gap and son
Intercarrier jump location reference signals PRS of the arrangement from NB-IoT equipment, as single RB, what it is by different frequency hopping points includes
The resource particle RE of PRS is combined as a symbol, equally improves signal bandwidth, and the frequency hopping FH symbols combined are concerned with
TDE, because the bandwidth between frequency hopping point broadens, range performance is also enhanced.It means that if FH narrow band signals
Distribution is in broader bandwidth, even if can reach accurate ranging estimation if in intensive multi-path environment.
In the above-mentioned technical solutions, it is preferable that further include：Second allocation unit, in each time slot, cell to be joined
Signal CRS distribution is examined in resource particle not Chong Die with the time domain where PRS.
In the technical scheme, cell reference signals CRS is arranged in resource particle not Chong Die with the time domain where PRS
In, so that cell reference signals CRS is existed independently of each other with location reference signals, to avoid mutual interference and remnants as possible
Frequency deviation causes the performance of the related operation in ToA detection process to decline, while avoiding the delay of related cell position fixing process.
In any of the above-described technical solution, it is preferable that be divided into Fsc=15khz between subcarrier.
In any of the above-described technical solution, it is preferable that the period of OFDM symbol is Ts=1/Fsc=66.7us.
In any of the above-described technical solution, it is preferable that between the range performance of the relevant TDE of FH symbols and different frequency hopping points
Frequency band broaden positive correlation.
In the technical scheme, the resolution ratio of multipath reflection depends on signal bandwidth, and bandwidth is higher, and identification is higher, such as
Fruit is that then the effect is relatively poor by TDE for narrow band signal.By rational hopping scheme energy widening frequency band in different RB, combined
Frequency hopping FH symbols relevant TDE because the bandwidth between frequency hopping point broadens, range performance is also enhanced, to obtain
Obtain better range performance.
The additional aspect and advantage of the present invention will become apparent in following description section, or practice through the invention
Recognize.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 shows the flow diagram of NB-IoT equipment localization method according to an embodiment of the invention；
Fig. 2 shows the flow diagrams of NB-IoT equipment localization methods according to another embodiment of the invention；
Fig. 3 shows the schematic block diagram of NB-IoT equipment positioning device according to an embodiment of the invention；
Fig. 4 shows the schematic block diagram of NB-IoT equipment positioning devices according to another embodiment of the invention；
Fig. 5 shows cell reference signals CRS in a resource block RB according to an embodiment of the invention and fixed
Position reference signal PRS distribution schematic diagrams；
Fig. 6 shows frequency hopping PRS arrangement schematic diagrams in different time-gap according to an embodiment of the invention.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
As shown in Figure 1, the flow diagram of NB-IoT equipment localization method according to an embodiment of the invention.Its
In, the NB-IoT equipment localization methods, including：
Step 102, in each time slot, the location reference signals PRS distribution from NB-IoT equipment is right in time slot institute
In the time/frequency source block RB answered, so that PRS is present in 10 subcarriers in continuous 12 subcarriers on frequency domain direction
In and time domain direction in 5 OFDM symbols in continuous 7 OFDM symbols；
Step 104, the resource particle RE comprising PRS is merged into a PRS symbol, then PRS symbols are on frequency domain
12 subcarriers are in the time domain an OFDM symbol；
Step 106, time delay is carried out according to the PRS symbols after merging and estimates TDE；
Step 108, under the premise of keeping being concerned with TDE, the jump distribution PRS in different time slots；
Step 110, the resource particle comprising PRS of different frequency hopping points is merged into a frequency hopping FH symbol, so that not
It broadens with the frequency band between frequency hopping point, then the range performance of the relevant TDE of the FH symbols after merging accordingly enhances；
Step 112, it is positioned according to the relevant TDE of FH symbols.
NB-IoT equipment localization method provided by the invention, first by the location reference signals PRS from NB-IoT equipment
It distributes in a time/frequency source block RB corresponding to the time slot, the resource particle RE comprising PRS is merged into a symbol,
One is formed on frequency domain comprising the PRS symbols for including an OFDM symbol on 12 subcarriers and time domain.In single RB
In, the PRS symbols after combination so that the peak value of LoS related operations can be accurately identified, to obtain accurate time delay estimation
TDE (Time Delay Estimation, TDE).In addition, under the premise of keeping being concerned with TDE, by different time-gap and son
Intercarrier jump location reference signals PRS of the arrangement from NB-IoT equipment, as single RB, what it is by different frequency hopping points includes
The resource particle RE of PRS is combined as a symbol, equally improves signal bandwidth, and the frequency hopping FH symbols combined are concerned with
TDE, because the bandwidth between frequency hopping point broadens, range performance is also enhanced.It means that if FH narrow band signals
Distribution is in broader bandwidth, even if can reach accurate ranging estimation if in intensive multi-path environment.
As shown in Fig. 2, the flow diagram of NB-IoT equipment localization methods according to another embodiment of the invention.Its
In, the NB-IoT equipment localization methods, including：
Step 202, in each time slot, the location reference signals PRS distribution from NB-IoT equipment is right in time slot institute
In the time/frequency source block RB answered, so that PRS is present in 10 subcarriers in continuous 12 subcarriers on frequency domain direction
In and time domain direction in 5 OFDM symbols in continuous 7 OFDM symbols；By cell reference signals CRS distribution not
In the resource particle Chong Die with the time domain where PRS；
Step 204, the resource particle RE comprising PRS is merged into a PRS symbol, then PRS symbols are on frequency domain
12 subcarriers are in the time domain an OFDM symbol；
Step 206, time delay is carried out according to the PRS symbols after merging and estimates TDE；
Step 208, under the premise of keeping being concerned with TDE, the jump distribution PRS in different time slots；
Step 210, the resource particle comprising PRS of different frequency hopping points is merged into a frequency hopping FH symbol, so that not
It broadens with the frequency band between frequency hopping point, then the range performance of the relevant TDE of the FH symbols after merging accordingly enhances；
Step 212, it is positioned according to the relevant TDE of FH symbols.
In this embodiment, cell reference signals CRS is arranged in resource particle not Chong Die with the time domain where PRS
In, so that cell reference signals CRS is existed independently of each other with location reference signals, to avoid mutual interference and remnants as possible
Frequency deviation causes the performance of the related operation in ToA detection process to decline, while avoiding the delay of related cell position fixing process.
In any of the above-described embodiment, it is preferable that be divided into Fsc=15khz between subcarrier.
In any of the above-described embodiment, it is preferable that the period of OFDM symbol is Ts=1/Fsc=66.7us.
In any of the above-described embodiment, it is preferable that between the range performance of the relevant TDE of FH symbols and different frequency hopping points
Bandwidth positive correlation.
In this embodiment, the resolution ratio of multipath reflection depends on signal bandwidth, and bandwidth is higher, and identification is higher, if
It is that then the effect is relatively poor by TDE for narrow band signal.By rational hopping scheme energy widening frequency band in different RB, combined
The relevant TDE of frequency hopping FH symbols, because the bandwidth between frequency hopping point broadens, range performance is also enhanced, to obtain
Better range performance.
As shown in figure 3, the schematic block diagram of NB-IoT equipment positioning device according to an embodiment of the invention.Wherein,
The NB-IoT equipment positioning device 300, including：
First allocation unit 302, in each time slot, the location reference signals PRS from NB-IoT equipment to be divided
It fits in a time/frequency source block RB corresponding to time slot, so that PRS is present on frequency domain direction in continuous 12 subcarriers
10 subcarriers in and time domain direction in 5 OFDM symbols in continuous 7 OFDM symbols；
Assembled unit 304, for will include that the resource particle RE of PRS is merged into a PRS symbol, then PRS symbols exist
It is 12 subcarriers on frequency domain, is in the time domain an OFDM symbol；
Computing unit 306 estimates TDE for carrying out time delay according to the PRS symbols after merging；
First allocation unit 302 is additionally operable under the premise of keeping being concerned with TDE, distribution of jumping in different time slots
PRS；
Assembled unit 304 is additionally operable to the resource particle comprising PRS of different frequency hopping points being merged into a frequency hopping FH symbol
In, so that the frequency band between different frequency hopping points broadens, then the range performance of the relevant TDE of the FH symbols after merging accordingly enhances；
Positioning unit 308, for being positioned according to the relevant TDE of FH symbols.
NB-IoT equipment positioning device 300 provided by the invention, first by the location reference signals from NB-IoT equipment
In a time/frequency source block RB of the PRS distribution corresponding to the time slot, the resource particle RE comprising PRS is merged into a symbol
In, one is formed on frequency domain comprising the PRS symbols for including an OFDM symbol on 12 subcarriers and time domain.Single
In RB, the PRS symbols after combination so that the peak value of LoS related operations can be accurately identified, and be estimated to obtain accurate time delay
Count TDE (Time Delay Estimation, TDE).In addition, under the premise of keeping being concerned with TDE, by different time-gap and
Location reference signals PRS of the jump arrangement from NB-IoT equipment between subcarrier, as single RB, by the packet of different frequency hopping points
Resource particle RE containing PRS is combined as a symbol, equally improves signal bandwidth, and the frequency hopping FH symbols combined are concerned with
TDE, because the bandwidth between frequency hopping point broadens, range performance is also enhanced.It means that if FH narrow band signals
Distribution is in broader bandwidth, even if can reach accurate ranging estimation if in intensive multi-path environment.
As shown in figure 4, the schematic block diagram of NB-IoT equipment positioning devices according to another embodiment of the invention.Its
In, the NB-IoT equipment positioning device 400, including：
First allocation unit 402, in each time slot, the location reference signals PRS from NB-IoT equipment to be divided
It fits in a time/frequency source block RB corresponding to time slot, so that PRS is present on frequency domain direction in continuous 12 subcarriers
10 subcarriers in and time domain direction in 5 OFDM symbols in continuous 7 OFDM symbols；
Assembled unit 404, for will include that the resource particle RE of PRS is merged into a PRS symbol, then PRS symbols exist
It is 12 subcarriers on frequency domain, is in the time domain an OFDM symbol；
Computing unit 406 estimates TDE for carrying out time delay according to the PRS symbols after merging；
First allocation unit 402 is additionally operable under the premise of keeping being concerned with TDE, distribution of jumping in different time slots
PRS；
Assembled unit 404 is additionally operable to the resource particle comprising PRS of different frequency hopping points being merged into a frequency hopping FH symbol
In, so that the frequency band between different frequency hopping points broadens, then the range performance of the relevant TDE of the FH symbols after merging accordingly enhances；
Positioning unit 408, for being positioned according to the relevant TDE of FH symbols；
Second allocation unit 410, in each time slot, by cell reference signals CRS distribution not with PRS where
In the resource particle of time domain overlapping.
In this embodiment, cell reference signals CRS is arranged in resource particle not Chong Die with the time domain where PRS
In, so that cell reference signals CRS is existed independently of each other with location reference signals, to avoid mutual interference and remnants as possible
Frequency deviation causes the performance of the related operation in ToA detection process to decline, while avoiding the delay of related cell position fixing process.
In any of the above-described embodiment, it is preferable that be divided into Fsc=15khz between subcarrier.
In any of the above-described embodiment, it is preferable that the period of OFDM symbol is Ts=1/Fsc=66.7us.
In any of the above-described embodiment, it is preferable that between the range performance of the relevant TDE of FH symbols and different frequency hopping points
Frequency band broadens positive correlation.
In this embodiment, the resolution ratio of multipath reflection depends on signal bandwidth, and bandwidth is higher, and identification is higher, if
It is that then the effect is relatively poor by TDE for narrow band signal.By rational hopping scheme energy widening frequency band in different RB, combined
The relevant TDE of frequency hopping FH symbols, because the bandwidth between frequency hopping point broadens, range performance is also enhanced, to obtain
Better range performance.
Specific embodiment：One slot s lot for not taking belt controling signal, the cell reference in a resource block RB
Signal CRS and location reference signals PRS distributions such as Fig. 5 such as show：In a slot, PRS is present in 10 in 12 subcarriers
In 5 symbols in a subcarrier and in 7 OFDM symbols；Fsc=15khz, the week of OFDM symbol are divided between subcarrier
Phase is Ts=1/Fsc=66.7us, the resource particle RE comprising PRS is merged into a symbol, it is preferable that in a slot
Middle Frequency Synchronization is made fine, and be TDE with the symbol after this combination PRS will be than obtaining higher with a PRS symbol
Precision.
In addition, under the premise of keeping being concerned with TDE, pass through arrangement NB-IoT equipment of jumping between different slot and subcarrier
PRS, further improve range capability.As a RB, the PRS RE of different frequency hopping points are combined as a symbol,
As shown in Figure 6.The relevant TDE of the FH symbol combined, because the bandwidth between frequency hopping point broadens, range performance also obtains
Enhancing is arrived.
In this sense, if the distribution of FH narrow band signals in broader bandwidth, even if in intensive multipath
In environment, it can also reach accurate ranging estimation.However, in specific implementation process, due to different receiver structures, each
Frequency deviation may be introduced in the frequency hopping of PRS and group is delayed, and the range performance of complete relevant TDE at this moment may be not achieved.
In this embodiment, the symbol comprising PRS is combined in single RB and improves the computational accuracy of TDE；
In different RB, signal bandwidth can equally be improved by the method for distributing narrowband PRS Frequency Hopping Signals, to improve TDE's
Performance improves the accessible range capability of multi-path environment by the relevant TDE of frequency hopping narrow band signal.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of NB-IoT equipment localization method, which is characterized in that including：
In each time slot, the location reference signals PRS from the NB-IoT equipment is distributed corresponding to the time slot
In one time/frequency source block RB, so that the PRS is present in 10 sons in continuous 12 subcarriers on frequency domain direction
In 5 OFDM symbols in carrier wave and on time domain direction in continuous 7 OFDM symbols；
Resource particle RE comprising the PRS is merged into a PRS symbol, then the PRS symbols are 12 on frequency domain
The subcarrier is in the time domain an OFDM symbol；
Time delay, which is carried out, according to the PRS symbols after merging estimates TDE；
Under the premise of keeping being concerned with TDE, the jump distribution PRS in different time slots；
The resource particle comprising the PRS of different frequency hopping points is merged into a frequency hopping FH symbol, so that the different jumps
Frequency band between frequency point broadens, then the range performance of the relevant TDE of the FH symbols after merging accordingly enhances；
It is positioned according to the relevant TDE of the FH symbols.
2. NB-IoT equipment localization method according to claim 1, which is characterized in that further include：
In each time slot, by cell reference signals CRS distribution in resource grains not Chong Die with the time domain where the PRS
In son.
3. NB-IoT equipment localization method according to claim 1, which is characterized in that
It is divided into Fsc=15khz between the subcarrier.
4. NB-IoT equipment localization method according to claim 1, which is characterized in that
The period of the OFDM symbol is Ts=1/Fsc=66.7us.
5. NB-IoT equipment localization method according to any one of claim 1 to 4, which is characterized in that
Bandwidth positive correlation between the range performance of the relevant TDE of the FH symbols and the different frequency hopping points.
6. a kind of NB-IoT equipment positioning device, which is characterized in that including：
First allocation unit, in each time slot, the location reference signals PRS distribution from the NB-IoT equipment to be existed
In a time/frequency source block RB corresponding to the time slot, so that the PRS is present in continuous 12 sons on frequency domain direction and carries
In 5 OFDM symbols in 10 subcarriers in wave and on time domain direction in continuous 7 OFDM symbols；
Assembled unit, for will include that the resource particle RE of the PRS is merged into a PRS symbol, then the PRS symbols exist
It is 12 subcarriers on frequency domain, is in the time domain an OFDM symbol；
Computing unit estimates TDE for carrying out time delay according to the PRS symbols after merging；
The allocation unit is additionally operable under the premise of keeping being concerned with TDE, the jump distribution PRS in different time slots；
The assembled unit is additionally operable to the resource particle comprising the PRS of different frequency hopping points being merged into a frequency hopping FH symbol
In number, so that the frequency band between the difference frequency hopping point broadens, then the range performance of the relevant TDE of the FH symbols after merging
Corresponding enhancing；
Positioning unit, for being positioned according to the relevant TDE of the FH symbols.
7. NB-IoT equipment positioning device according to claim 6, which is characterized in that further include：
Second allocation unit, in each time slot, by cell reference signals CRS distribution not with the PRS where
Time domain overlapping resource particle in.
8. NB-IoT equipment positioning device according to claim 6, which is characterized in that
It is divided into Fsc=15khz between the subcarrier.
9. NB-IoT equipment positioning device according to claim 6, which is characterized in that
The period of the OFDM symbol is Ts=1/Fsc=66.7us.
10. the NB-IoT equipment positioning devices according to any one of claim 6 to 9, which is characterized in that
Frequency band between the range performance of the relevant TDE of the FH symbols and the different frequency hopping points broadens positive correlation.
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