CN108391311B - NB-IoT equipment positioning method and device - Google Patents
NB-IoT equipment positioning method and device Download PDFInfo
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- CN108391311B CN108391311B CN201810018095.8A CN201810018095A CN108391311B CN 108391311 B CN108391311 B CN 108391311B CN 201810018095 A CN201810018095 A CN 201810018095A CN 108391311 B CN108391311 B CN 108391311B
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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
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Abstract
The invention provides an NB-IoT equipment positioning method and device. The NB-IoT equipment positioning method comprises the following steps: in each slot, allocating Positioning Reference Signals (PRS) from NB-IoT equipment in one time-frequency Resource Block (RB) corresponding to the slot, so that the PRS exists in 10 subcarriers of 12 continuous subcarriers in a frequency domain direction and in 5 OFDM symbols of 7 continuous OFDM symbols in a time domain direction; combining the resource elements RE containing PRS into one PRS symbol, wherein the PRS symbol is 12 subcarriers in frequency domain and one OFDM symbol in time domain; performing Time Delay Estimation (TDE) according to the combined PRS symbol; under the premise of keeping coherent TDE, hopping and allocating PRS in different time slots; combining the resource particles containing PRS of different hopping points into one hopping FH symbol so as to widen the frequency band between different hopping points, and correspondingly enhancing the ranging performance of coherent TDE of the combined FH symbol; the positioning is performed according to the coherent TDE of the FH symbols.
Description
Technical Field
The invention relates to the technical field of positioning of NarrowBand physical network terminals, in particular to a method for positioning NB-IoT (NarrowBand band Internet of Things) equipment and an NB-IoT equipment positioning device.
Background
In recent years, with the vigorous development of the internet of things technology, various technical standards and implementation schemes based on different application scenes are gradually developed and matured. Typical standards are eMTC, LoRa, NB-IoT, Sigfox, etc. The NB-IoT standard has the advantages of wide coverage, large connection, low cost, low power consumption, and the like, and is considered to have a good application prospect in various occasions where the requirements for delay are not high, the requirements for power consumption are as low as possible, and the number of connected terminals is large.
The 3GPP does not specify a positioning-related specification in the existing NB-IoT standard Release 13. Since the location information can improve the communication performance, a relevant part may be proposed in Release 14. A preliminary goal may be a positioning accuracy of 50 meters indoors and outdoors. Since the system bandwidth of NB-IoT is only 240khz, which is much smaller than the maximum bandwidth of LTE 20Mhz, it is a great challenge for dense multipath environment, especially when positioning needs to be performed by using a Time-Difference of Arrival (TDoA) method.
Compared with LTE, the available resources of NB-IoT are limited, the complexity of the device is reduced, and the means for positioning at present are limited to enhanced Cell identity E-cid (enhanced Cell id), observed Time Difference of arrival otdoa (observed Time Difference of arrival), and uplink Time Difference of arrival utdoa (uplink Time Difference of arrival). Schemes for UTDoA narrowband measurements using the uplink channel are under study. NB-IoT employs conventional Positioning Reference Signal PRS (PRS) in OTDoA and specifies narrowband PRS (nprs) allocated in one time-frequency grid Resource Block RB (RB).
In urban environments, multipath reflections and interference between base stations and devices present significant challenges for using TDoA positioning due to the presence of multipath. In order to reduce the ranging offset, it is necessary to try to eliminate the effect of multipath. However, NB-IoT devices have greatly limited the use of these techniques due to the extremely low power consumption requirements and small signal bandwidth. The complexity of the algorithm must be reduced.
In addition, low cost, high battery efficiency is crucial for IoT devices. Typically, the battery of an NB-IoT device is to have an operational age of around 10 years. In this way, the RF side is required to use a lower signal sampling rate (NB-IoT sampling rate is 1.92Mbps), and in order to reduce inter-cell PRS signal interference, no positioning subframe is sent in the PDSCH. Nevertheless, due to the existence Of Time-delays (Time-delays), the PRS signals from each cell still have strong interference, which results in the degradation Of the TOA (Time Of Arrival) detection performance based on the TOA. Of course, PRS muting can avoid signal collision, but at the same time linearly increases the delay of the relevant cell positioning procedure, and thus is not feasible for cell dense time. In addition to the inter-cell interference, the frequency offset fo (frequency offset) based on the synchronization estimation is not perfect, resulting in residual frequency offset, which also causes performance degradation of correlation operations in the ToA detection process.
Typically, one makes a ranging estimate by detecting whether the first peak of the cross-correlation (received signal versus pilot signal) exceeds a certain threshold. Such estimators are used by the 3GPP for performance evaluation of OTDoA because of their low computational complexity. The performance of a threshold-based estimator is limited by non line of sight (NLoS) conditions and the processing of multipath reflections. Not meeting the line-of-sight condition will cause a range offset, and this estimator cannot counteract this effect.
Therefore, how to provide an algorithm with moderate complexity is a technical problem to be solved urgently at present, based on reducing the influence of multipath on positioning and avoiding performance degradation caused by interference between PRSs and residual frequency offset as much as possible.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to propose an NB-IoT device positioning method.
Another aspect of the present invention is to provide an NB-IoT device location apparatus.
In view of this, the present invention provides an NB-IoT device positioning method, including: in each slot, allocating Positioning Reference Signals (PRS) from NB-IoT equipment in one time-frequency Resource Block (RB) corresponding to the slot, so that the PRS exists in 10 subcarriers of 12 continuous subcarriers in a frequency domain direction and in 5 OFDM symbols of 7 continuous OFDM symbols in a time domain direction; combining the resource elements RE containing PRS into one PRS symbol, wherein the PRS symbol is 12 subcarriers in frequency domain and one OFDM symbol in time domain; performing Time Delay Estimation (TDE) according to the combined PRS symbol; under the premise of keeping coherent TDE, hopping and allocating PRS in different time slots; combining the PRS-containing resource particles of different Hopping points into a Frequency Hopping (FH) symbol to widen the Frequency bands among the different Hopping points, so that the ranging performance of the coherent TDE of the combined FH symbol is correspondingly enhanced; the positioning is performed according to the coherent TDE of the FH symbols.
According to the NB-IoT equipment positioning method, firstly, a positioning reference signal PRS from the NB-IoT equipment is distributed in a time-frequency resource block RB corresponding to the time slot, resource elements RE containing the PRS are combined into one symbol, and a PRS symbol containing 12 subcarriers in a frequency domain and one OFDM symbol in a time domain is formed. In a single RB, the combined PRS symbols allow the peak of Line of Sight (LoS) correlation to be accurately identified, thereby obtaining an accurate Time Delay Estimate (TDE). In addition, on the premise of keeping coherent TDE, positioning reference signals PRS from NB-IoT equipment are arranged in a hopping mode between different time slots and subcarriers, and resource particles RE containing PRS at different hopping points are combined into a symbol like a single RB, so that the signal bandwidth is equivalently improved, and the ranging performance of the coherent TDE of the combined frequency hopping FH symbol is enhanced because the bandwidth between the hopping points is widened. This means that if the FH narrowband signal is allocated over a wider bandwidth, accurate ranging estimates can be achieved even in dense multipath environments.
In the above technical solution, preferably, the method further includes: in each slot, cell reference signals CRS are allocated in resource elements that do not overlap with the time domain in which the PRS is located.
In the technical scheme, the cell reference signal CRS is arranged in the resource particles which are not overlapped with the time domain of the PRS, so that the cell reference signal CRS and the positioning reference signal exist independently, the performance reduction of correlation operation in the ToA detection process caused by mutual interference and residual frequency offset is avoided to the greatest extent, and meanwhile, the time delay of the positioning process of the related cell is avoided.
In any of the above technical solutions, preferably, the subcarrier spacing is Fsc-15 khz.
In any of the above technical solutions, preferably, the period of the OFDM symbol is Ts ═ 1/Fsc ═ 66.7 us.
In any of the above technical solutions, preferably, the ranging performance of the coherent TDE of the FH symbol is positively correlated with the frequency bandwidth between different hop points.
In the technical scheme, the resolution of the multipath reflection depends on the bandwidth of the signal, the higher the bandwidth is, the higher the resolution is, and if the signal is a narrowband signal, the TDE effect is poor. The frequency band can be widened through a reasonable frequency hopping scheme in different RBs, and the ranging performance of the combined frequency hopping FH symbol is enhanced because the bandwidth between the frequency hopping points is widened, so that better ranging performance is obtained.
The present invention further provides an NB-IoT device positioning apparatus, including: a first allocation unit, configured to allocate, in each slot, a positioning reference signal PRS from an NB-IoT device in one time-frequency resource block RB corresponding to the slot, so that the PRS exists in 10 subcarriers of 12 consecutive subcarriers in a frequency domain direction and in 5 OFDM symbols of 7 consecutive OFDM symbols in a time domain direction; a combining unit, configured to combine resource elements RE including PRS into one PRS symbol, where the PRS symbol is 12 subcarriers in a frequency domain and is one OFDM symbol in a time domain; a calculating unit, configured to perform time delay estimation TDE according to the combined PRS symbol; the allocation unit is further used for hopping and allocating PRS in different time slots on the premise of keeping coherent TDE; the combination unit is further configured to combine resource particles containing PRSs at different hopping points into one hopping FH symbol, so that a frequency band between the different hopping points is widened, and the ranging performance of coherent TDE of the combined FH symbol is correspondingly enhanced; and the positioning unit is used for positioning according to coherent TDE of the FH symbols.
According to the positioning device of the NB-IoT equipment, firstly, a positioning reference signal PRS from the NB-IoT equipment is distributed in a time frequency resource block RB corresponding to the time slot, resource elements RE containing the PRS are combined into one symbol, and a PRS symbol containing 12 subcarriers in a frequency domain and one OFDM symbol in a time domain is formed. In a single RB, the PRS symbols after combination enable the peak of the LoS correlation to be accurately identified, thereby obtaining an accurate Time Delay Estimation (TDE). In addition, on the premise of keeping coherent TDE, positioning reference signals PRS from NB-IoT equipment are arranged in a hopping mode between different time slots and subcarriers, and resource particles RE containing PRS at different hopping points are combined into a symbol like a single RB, so that the signal bandwidth is equivalently improved, and the ranging performance of the coherent TDE of the combined frequency hopping FH symbol is enhanced because the bandwidth between the hopping points is widened. This means that if the FH narrowband signal is allocated over a wider bandwidth, accurate ranging estimates can be achieved even in dense multipath environments.
In the above technical solution, preferably, the method further includes: and a second allocating unit, configured to allocate, in each timeslot, the cell reference signal CRS in resource elements that do not overlap with a time domain in which the PRS is located.
In the technical scheme, the cell reference signal CRS is arranged in the resource particles which are not overlapped with the time domain of the PRS, so that the cell reference signal CRS and the positioning reference signal exist independently, the performance reduction of correlation operation in the ToA detection process caused by mutual interference and residual frequency offset is avoided to the greatest extent, and meanwhile, the time delay of the positioning process of the related cell is avoided.
In any of the above technical solutions, preferably, the subcarrier spacing is Fsc-15 khz.
In any of the above technical solutions, preferably, the period of the OFDM symbol is Ts ═ 1/Fsc ═ 66.7 us.
In any of the above technical solutions, preferably, the ranging performance of coherent TDE of FH symbols is positively correlated with the band broadening between different hop points.
In the technical scheme, the resolution of the multipath reflection depends on the bandwidth of the signal, the higher the bandwidth is, the higher the resolution is, and if the signal is a narrowband signal, the TDE effect is poor. The frequency band can be widened through a reasonable frequency hopping scheme in different RBs, and the ranging performance of the combined frequency hopping FH symbol is enhanced because the bandwidth between the frequency hopping points is widened, so that better ranging performance is obtained.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a flow diagram of an NB-IoT device location method according to one embodiment of the present invention;
fig. 2 shows a flow diagram of an NB-IoT device location method according to another embodiment of the present invention;
fig. 3 shows a schematic block diagram of an NB-IoT device location apparatus in accordance with one embodiment of the present invention;
fig. 4 shows a schematic block diagram of an NB-IoT device location apparatus in accordance with another embodiment of the present invention;
FIG. 5 shows a schematic diagram of cell reference signals CRS and positioning reference signals PRS distribution in one resource block RB according to an embodiment of the present invention;
figure 6 shows a diagram of a frequency-hopped PRS arrangement in different time slots according to one embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 1, a flowchart of an NB-IoT device location method according to one embodiment of the present invention is illustrated. The NB-IoT device positioning method comprises the following steps:
106, performing Time Delay Estimation (TDE) according to the combined PRS symbol;
and step 112, positioning according to coherent TDE of the FH symbols.
The positioning method of the NB-IoT equipment provided by the invention firstly allocates a Positioning Reference Signal (PRS) from the NB-IoT equipment in a time frequency Resource Block (RB) corresponding to the time slot, and combines resource particles (RE) containing the PRS into a symbol to form a PRS symbol which contains 12 subcarriers in a frequency domain and contains an OFDM symbol in a time domain. In a single RB, the PRS symbols after combination enable the peak of the LoS correlation to be accurately identified, thereby obtaining an accurate Time Delay Estimation (TDE). In addition, on the premise of keeping coherent TDE, positioning reference signals PRS from NB-IoT equipment are arranged in a hopping mode between different time slots and subcarriers, and resource particles RE containing PRS at different hopping points are combined into a symbol like a single RB, so that the signal bandwidth is equivalently improved, and the ranging performance of the coherent TDE of the combined frequency hopping FH symbol is enhanced because the bandwidth between the hopping points is widened. This means that if the FH narrowband signal is allocated over a wider bandwidth, accurate ranging estimates can be achieved even in dense multipath environments.
As shown in fig. 2, a flowchart of an NB-IoT device location method according to another embodiment of the present invention is illustrated. The NB-IoT device positioning method comprises the following steps:
In this embodiment, the cell reference signal CRS is arranged in a resource particle that is not overlapped with the time domain where the PRS is located, so that the cell reference signal CRS and the positioning reference signal exist independently from each other, thereby avoiding performance degradation of correlation operation in the ToA detection process due to mutual interference and residual frequency offset as much as possible, and avoiding delay in the positioning process of the relevant cell.
In any of the above embodiments, preferably, the subcarrier spacing is Fsc 15 khz.
In any of the above embodiments, preferably, the period of the OFDM symbol is Ts 1/Fsc 66.7 us.
In any of the above embodiments, preferably, the ranging performance of coherent TDE for FH symbols is positively correlated with the frequency bandwidth between different hop points.
In this embodiment, the resolution of the multipath reflection depends on the signal bandwidth, the higher the resolution, and the worse the TDE effect if it is a narrowband signal. The frequency band can be widened through a reasonable frequency hopping scheme in different RBs, and the ranging performance of the combined frequency hopping FH symbol is enhanced because the bandwidth between the frequency hopping points is widened, so that better ranging performance is obtained.
As shown in fig. 3, a schematic block diagram of an NB-IoT device location apparatus in accordance with one embodiment of the present invention. Wherein, the NB-IoT device positioning apparatus 300 comprises:
a first allocating unit 302, configured to allocate, in each slot, a positioning reference signal PRS from an NB-IoT device in one time-frequency resource block RB corresponding to the slot, so that the PRS exists in 10 subcarriers of 12 consecutive subcarriers in a frequency domain direction and in 5 OFDM symbols of 7 consecutive OFDM symbols in a time domain direction;
a combining unit 304, configured to combine resource elements REs containing PRSs into one PRS symbol, where the PRS symbol is 12 subcarriers in a frequency domain and one OFDM symbol in a time domain;
a calculating unit 306, configured to perform time delay estimation TDE according to the combined PRS symbol;
a first allocating unit 302, further configured to hop and allocate PRSs in different timeslots on the premise of maintaining coherent TDE;
the combining unit 304 is further configured to combine resource particles containing PRSs at different hopping points into one hopping FH symbol, so that a frequency band between the different hopping points is widened, and a ranging performance of a coherent TDE of the combined FH symbol is correspondingly enhanced;
a positioning unit 308, configured to perform positioning according to coherent TDE of FH symbols.
The NB-IoT device positioning apparatus 300 according to the present invention first allocates a positioning reference signal PRS from an NB-IoT device in a time-frequency resource block RB corresponding to the timeslot, combines resource elements RE containing the PRS into one symbol, and forms a PRS symbol containing 12 subcarriers in a frequency domain and one OFDM symbol in a time domain. In a single RB, the PRS symbols after combination enable the peak of the LoS correlation to be accurately identified, thereby obtaining an accurate Time Delay Estimation (TDE). In addition, on the premise of keeping coherent TDE, positioning reference signals PRS from NB-IoT equipment are arranged in a hopping mode between different time slots and subcarriers, and resource particles RE containing PRS at different hopping points are combined into a symbol like a single RB, so that the signal bandwidth is equivalently improved, and the ranging performance of the coherent TDE of the combined frequency hopping FH symbol is enhanced because the bandwidth between the hopping points is widened. This means that if the FH narrowband signal is allocated over a wider bandwidth, accurate ranging estimates can be achieved even in dense multipath environments.
As shown in fig. 4, a schematic block diagram of an NB-IoT device location apparatus in accordance with another embodiment of the present invention. Wherein the NB-IoT device positioning apparatus 400 comprises:
a first allocating unit 402, configured to allocate, in each slot, a positioning reference signal PRS from an NB-IoT device in one time-frequency resource block RB corresponding to the slot, so that the PRS exists in 10 subcarriers of 12 consecutive subcarriers in a frequency domain direction and in 5 OFDM symbols of 7 consecutive OFDM symbols in a time domain direction;
a combining unit 404, configured to combine resource elements REs containing PRS into one PRS symbol, where the PRS symbol is 12 subcarriers in a frequency domain and one OFDM symbol in a time domain;
a calculating unit 406, configured to perform time delay estimation TDE according to the combined PRS symbol;
a first allocating unit 402, configured to hop and allocate PRSs in different timeslots on the premise of maintaining coherent TDE;
a combining unit 404, configured to combine resource particles containing PRS of different hopping points into one hopping FH symbol, so as to widen frequency bands between the different hopping points, and accordingly enhance the ranging performance of coherent TDE of the combined FH symbol;
a positioning unit 408, configured to perform positioning according to coherent TDE of FH symbols;
a second allocating unit 410, configured to allocate, in each timeslot, a cell reference signal CRS in resource elements that do not overlap with a time domain in which the PRS is located.
In this embodiment, the cell reference signal CRS is arranged in a resource particle that is not overlapped with the time domain where the PRS is located, so that the cell reference signal CRS and the positioning reference signal exist independently from each other, thereby avoiding performance degradation of correlation operation in the ToA detection process due to mutual interference and residual frequency offset as much as possible, and avoiding delay in the positioning process of the relevant cell.
In any of the above embodiments, preferably, the subcarrier spacing is Fsc 15 khz.
In any of the above embodiments, preferably, the period of the OFDM symbol is Ts 1/Fsc 66.7 us.
In any of the above embodiments, preferably, the ranging performance of coherent TDE for FH symbols is positively correlated with the band broadening between different hop points.
In this embodiment, the resolution of the multipath reflection depends on the signal bandwidth, the higher the resolution, and the worse the TDE effect if it is a narrowband signal. The frequency band can be widened through a reasonable frequency hopping scheme in different RBs, and the ranging performance of the combined frequency hopping FH symbol is enhanced because the bandwidth between the frequency hopping points is widened, so that better ranging performance is obtained.
The specific embodiment is as follows: a slot not carrying a control signal, and the distribution of cell reference signals CRS and positioning reference signals PRS in a resource block RB is shown in fig. 5: in one slot, PRS is present in 10 out of 12 subcarriers and in 5 out of 7 OFDM symbols; the subcarrier spacing is 15khz, the period of the OFDM symbol is Ts 1/Fsc 66.7us, and resource elements RE containing PRS are combined into a symbol, preferably, frequency synchronization is well done in a slot, and the PRS-combined symbol is used for TDE with higher accuracy than a PRS symbol.
In addition, on the premise of keeping coherent TDE, PRS of NB-IoT equipment is arranged by jumping among different slots and subcarriers, so that the ranging capability is further improved. Like an RB, PRS REs of different hopping points are combined into a symbol, as shown in fig. 6. The combined coherent TDE of FH symbols also has enhanced ranging performance because the bandwidth between hopping points is broadened.
In this sense, if the FH narrowband signal is allocated over a wider bandwidth, accurate ranging estimation can be achieved even in dense multipath environments. However, in the implementation process, due to different receiver structures, frequency offset and group delay may be introduced into the hopping frequency of each PRS, and the ranging performance of the fully coherent TDE may not be achieved.
In this embodiment, combining symbols containing PRSs in a single RB improves the computational accuracy of the TDE; in different RBs, the signal bandwidth can be equivalently improved by the method of distributing the frequency hopping signal of the narrow-band PRS, thereby improving the performance of TDE, namely improving the range-finding capability which can be reached in a multipath environment by the coherent TDE of the frequency hopping narrow-band signal.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An NB-IoT device positioning method, comprising:
in each slot, allocating Positioning Reference Signals (PRS) from the NB-IoT equipment in one time-frequency Resource Block (RB) corresponding to the slot, so that the PRS exists in 10 subcarriers of 12 continuous subcarriers in a frequency domain direction and in 5 OFDM symbols of 7 continuous OFDM symbols in a time domain direction;
combining Resource Elements (REs) containing the PRS into one PRS symbol, wherein the PRS symbol is 12 subcarriers in a frequency domain and one OFDM symbol in a time domain;
performing Time Delay Estimation (TDE) according to the combined PRS symbol;
hopping the PRS in different time slots on the premise of keeping coherent TDE;
combining resource particles containing the PRS of different hopping points into one hopping FH symbol so as to widen the frequency band between the different hopping points, and correspondingly enhancing the ranging performance of the coherent TDE of the combined FH symbol;
and positioning according to the coherent TDE of the FH symbol.
2. The NB-IoT device location method in accordance with claim 1, further comprising:
in each of the slots, Cell Reference Signals (CRSs) are allocated in resource elements that do not overlap with a time domain in which the PRSs are located.
3. The NB-IoT device location method of claim 1,
the subcarrier spacing is 15 khz.
4. The NB-IoT device location method of claim 1,
the period of the OFDM symbol is Ts 1/Fsc 66.7 us.
5. The NB-IoT device positioning method according to any one of claims 1 to 4,
and the ranging performance of the coherent TDE of the FH symbols is positively correlated with the bandwidth among the different frequency hopping points.
6. An NB-IoT device positioning apparatus, comprising:
a first allocation unit, configured to allocate, in each slot, a positioning reference signal PRS from the NB-IoT device in one time-frequency resource block RB corresponding to the slot, so that the PRS exists in 10 subcarriers of 12 consecutive subcarriers in a frequency domain direction and in 5 OFDM symbols of 7 OFDM symbols consecutive in a time domain direction;
a combining unit, configured to combine resource elements REs containing the PRS into one PRS symbol, where the PRS symbol is 12 subcarriers in a frequency domain and one OFDM symbol in a time domain;
a calculating unit, configured to perform time delay estimation TDE according to the combined PRS symbol;
the allocation unit is further configured to hop and allocate the PRS in different timeslots on the premise of maintaining coherent TDE;
the combination unit is further configured to combine resource particles including the PRS at different hopping points into one frequency hopping FH symbol, so that a frequency band between the different hopping points is widened, and a ranging performance of a coherent TDE of the combined FH symbol is correspondingly enhanced;
and the positioning unit is used for positioning according to the coherent TDE of the FH symbol.
7. The NB-IoT device location apparatus of claim 6, further comprising:
a second allocating unit, configured to allocate, in each of the slots, a cell reference signal CRS in a resource element that does not overlap with a time domain in which the PRS is located.
8. The NB-IoT device location apparatus of claim 6,
the subcarrier spacing is 15 khz.
9. The NB-IoT device location apparatus of claim 6,
the period of the OFDM symbol is Ts 1/Fsc 66.7 us.
10. The NB-IoT device location apparatus of any one of claims 6 to 9,
and the ranging performance of the coherent TDE of the FH symbols is positively correlated with the frequency band broadening among the different frequency hopping points.
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| CN109039968B (en) * | 2018-09-13 | 2021-03-16 | 旺微科技（上海）有限公司 | Data receiving method and device based on narrow-band Internet of things terminal |
| WO2020119925A1 (en) * | 2018-12-14 | 2020-06-18 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Network assisted position measurements |
| CN111955035B (en) * | 2020-06-05 | 2022-11-22 | 北京小米移动软件有限公司 | Transmission method and device of positioning reference signal, electronic equipment and storage medium |
| CN113068127B (en) * | 2021-02-23 | 2022-08-19 | 中睿通信规划设计有限公司 | Positioning method of NB-IoT terminal |
| CN115002896A (en) * | 2021-03-02 | 2022-09-02 | 中兴通讯股份有限公司 | Signal transmission method, signal transmission device, and computer-readable storage medium |
| CN117376967A (en) * | 2022-06-30 | 2024-01-09 | 维沃移动通信有限公司 | Positioning measurement method, positioning measurement device, terminal and network side equipment |
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| CN101534285B (en) * | 2009-04-09 | 2015-07-22 | 中兴通讯股份有限公司 | A sending method for reference signals |
| CN102711242A (en) * | 2012-06-08 | 2012-10-03 | 华为技术有限公司 | Method for measuring time of arrival of reference signal of position neighbor cell, and terminal |
| JP6639650B2 (en) * | 2015-08-25 | 2020-02-05 | エルジー エレクトロニクス インコーポレイティド | Method and apparatus for receiving or transmitting a reference signal for determining a position in a wireless communication system |
| CN105472735B (en) * | 2015-12-10 | 2018-08-21 | 成都希盟泰克科技发展有限公司 | A kind of time delay evaluated error compensation method based on the positioning of the mobile terminals LTE |
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