CN107743059A - A kind of antenna port number detection method for arrowband Internet of Things - Google Patents
A kind of antenna port number detection method for arrowband Internet of Things Download PDFInfo
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- CN107743059A CN107743059A CN201710728938.9A CN201710728938A CN107743059A CN 107743059 A CN107743059 A CN 107743059A CN 201710728938 A CN201710728938 A CN 201710728938A CN 107743059 A CN107743059 A CN 107743059A
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0008—Wavelet-division
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- 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
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The method that one kind is related to Internet of Things wireless communication technology field, more particularly to the antenna port number detection of arrowband Internet of Things (NB IoT) is claimed in the present invention.It is inner by cyclic redundancy mask (CRC mask) to be implied in arrowband Physical Broadcast Channel (NPBCH) for antenna port number in NB IoT systems.The narrowband reference signal (NRS) in the case of 1/2 antenna port is read from the signal of reception, signal to noise ratio snr estimation is carried out using arrowband master sync signal (NPSS) and its unloaded ripple, when SNR is more than threshold value, antenna port number is adjudicated using the ratio between reference signal power of reference signal and the 2001st antenna port of the 2000th antenna port.Conversely, the detection of antenna port number is carried out using traditional blind Detecting method.The present invention can determine NB IoT antenna port number as early as possible, shorten antenna port number detection time, reduce amount of calculation, meet the requirement of engineering practice.
Description
Technical field
The invention belongs to Internet of Things wireless communication technology field, more particularly to terminal under arrowband Internet of Things (NB-IoT) system
The detection technique of antenna port number during cell initial search.
Background technology
Pointed out in national " 13 " planning outline, firmly to hold information technology Transformation Tendency, implement the war of network power
Slightly.Along with the generation and continuous development of extensive Internet of Things demand, arrowband Internet of Things (NB-IoT) is used as LPWAN
One of (LowPower Wide Area Network) technology, because covering, wide, connection is more, power consumption is few, low cost and other advantages are more next
More it is concerned by people.
Wherein arrowband Physical Broadcast Channel (NPBCH) supports single-antenna transmission pattern and diversity transmission pattern, supports 1/2 liang
Kind antenna port radiation pattern.While terminal understands NPBCH channels acquisition MIB (Master Information Block), it is necessary to correct detection
The emission port number that NPBCH channels use.The embodying information of antenna port number is in NPBCH CRC mask (CRCs
Mask) inside information, the letter of antenna port number can not be obtained inside its CRC mask before correctly detection NPBCH channels
Breath；If however, there is no antenna port number, channel estimation and equalization can not be carried out to NPBCH channels with correct antenna number.It is existing
There is technology to generally attempt to carry out NPBCH decodings with 1/2 two kinds of transmit antenna port number situations respectively, until NPBCH is correctly decoded
Untill, decoding complexity can be so increased, particularly possible maximum undergoes twice completely decoding process ability correct decoding, has
There is sizable amount of calculation, be unfavorable for engineering practice requirement.
The content of the invention
Present invention seek to address that above problem of the prior art.Propose a kind of shortening antenna port number detection time, drop
Low amount of calculation, meet the antenna port number detection method for arrowband Internet of Things of the requirement of real-time of system.The skill of the present invention
Art scheme is as follows：
A kind of antenna port number detection method for arrowband Internet of Things, it comprises the following steps：
1), UE carries out cell searching and Timing Synchronization, determines the position of arrowband Physical Broadcast Channel NPBCH mappings；
2), in the time-frequency resource maps of arrowband Physical Broadcast Channel NPBCH mappings, according to the ginseng of each antenna port transmitting
The position where the resource element RE of signal mapping is examined, extracts the narrowband reference signal NRS of antenna port 2000,2001 respectively；
3), in radio frames where the NPBCH in reception, the position of arrowband master sync signal NPSS mappings, Ran Houti are determined
Arrowband master sync signal NPSS signals and null subcarrier are taken, calculates the work(of NPSS signals and null subcarrier on a resource element RE
Rate ratio, it is approximate signal to noise ratio snr；
4), when signal to noise ratio snr is more than signal-noise ratio threshold value GSNRWhen, using the work(of extraction reception narrowband reference signal sequence
Rate detection method carries out port number detection, when signal to noise ratio snr is less than or equal to signal-noise ratio threshold value GSNRWhen, using traditional blind check
The method that method is detected, determine NPBCH transmission antenna port numbers.Wherein threshold value GSNRSpan, in awgn channel ring
According to a large amount of emulation under border, it is proposed that be 10~100.
Further, the power detecting method that the step 4) extraction receives narrowband reference signal sequence specifically includes step
Suddenly：(a) according to narrowband reference signal, the power of reference signal at the 2000th, 2001 antenna ports is calculated respectively；(b) according near
Determine that power ratio threshold value ρ a * SNR, wherein ρ are power ratio threshold coefficient like signal to noise ratio snr, span 0~1 it
Between；(c) power of narrowband reference signal corresponding to antenna port 2000 is calculatedJoin with 2001 corresponding arrowband of antenna port
Examine the power of signalRatio, i.e.,When the ratio is less than power ratio threshold value, then detect
NPBCH transmission antennas port number is 2, and otherwise antenna port number is 1.
Further, the step 3) calculates the power ratio of NPSS signals and null subcarrier on a resource element RE, is
Approximate signal to noise ratio snr concretely comprises the following steps：
(a) time-frequency location mapped according to NPSS signals, NPSS signals and 11 moneys without mapping signal information are extracted
Source element RE, NPSS signal occupies subframe #5 rear 11 OFDM symbols, and frequency domain occupies preceding 11 subcarriers；
(b) the approximate SNR on a RE is calculated, calculates the empty RE extracted general power P (N) and NPSS signals first
Approximate SNR cans on general power P (S), a RE are expressed as
Advantages of the present invention and have the beneficial effect that：
The present invention has necessarily adaptive by setting a threshold value to select suitable antenna port detection method
Property, the threshold value is based on arrowband master sync signal (NPSS) information and the power ratio of its unloaded ripple and judged, due to NPSS and
NPBCH is located at identical radio frames, and cell initial search process has determined that its accurate location, thus ensure that its validity and
Feasibility.Designed in addition, core concept of the present invention is the configuration mode feature that RE is mapped to based on NPBCH and reference signal.
Provided according to agreement, NPBCH channels are mapped in subframe #0 rear 11 symbols, and can be maximum according to cell reference signals (CRS)
Antenna port number is 4, and the situation that narrowband reference signal (NRS) maximum antenna port number is 2 is reference signal reserved location, so
And the mapping of reference signal is corresponding with antenna port number, therefore, when antenna port number is less than 2, the position of part reference signal
It is empty to put, as shown in Figure 2.Then, the power on RE that we can be taken using reference signal is point of penetration to be held
The detection of mouth number.But when channel condition is poor, because noise power is larger, only be likely to judge by accident with power detection,
Then traditional blind check method is selected to carry out Port detecting, the accuracy that raising channel condition detects when poor.Inspection proposed by the present invention
Survey method overcomes original blind Detecting and the problem of time-consuming and operand is big be present, suitable for Real-time System, meets NB-IoT
The index of system real time.
Brief description of the drawings
Fig. 1 is NPSS, NSSS signal time-frequency resource maps figure of the preferred embodiment of the present invention；
Fig. 2 is the NPBCH channel architecture time-frequency resource maps figures of the present invention；
Fig. 3 is preferred embodiment of the present invention port detecting method flow chart；
Fig. 4 is the specific implementation flow chart of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, detailed
Carefully describe.Described embodiment is only the part of the embodiment of the present invention.
The present invention solve above-mentioned technical problem technical scheme be：
The present invention is based on arrowband master sync signal (NPSS), arrowband Physical Broadcast Channel (NPBCH), narrowband reference signal
(NRS) the resource impact feature such as, a kind of detection method for antenna port number is proposed.When channel quality is preferable, based on narrow
Band reference signal power detection method；When channel quality is bad, detected based on traditional blind check method.
It is as shown in Figure 1 NPSS, NSSS signal time-frequency resource maps figure.Arrowband master sync signal NPSS is in each radio frames
Subframe #5 on send, cycle 10ms.Rear 11 symbols of a subframe, 11 subcarriers before being taken on frequency domain are taken in time domain
(0~10).Arrowband auxiliary synchronous signals NSSS is sent on the subframe #9 of even number radio frames, cycle 20ms.One is taken in time domain
Rear 11 symbols of individual subframe, 12 subcarriers are taken on frequency domain.
It is illustrated in figure 2 NPBCH channel architecture time-frequency resource maps figures.NPBCH uses the 640ms fixed schedule cycle,
Wherein transmission is sent on the subframe #0 for meeting SFNmod64=0 system-frame for the first time, and every in ensuing 640ms
Repeated on individual system-frame #0.During resource impact, Msymb=800 symbols can be divided into 8 isometric sub-blocks
(Block), each sub-block repeats to send 8 times, i.e., each sub-block can repeat to send in the subframe of 8 continuous system-frames.
When NPBCH is mapped to RE, it is always assumed that NRS uses 2 antenna ports (antenna port 2000 and 2001), CRS uses 4 antenna ports
(antenna port 0~3), and subframe #0 first three OFDM symbol can not be taken, to avoid and LTE system PDCCH, PHICH
Clashed with PCFICH channels.
The present invention proposes a kind of antenna port detection method.It is illustrated in figure 3 Port detecting flow chart.UE receives data,
Cell searching and Timing Synchronization are carried out, determines the mapping position where NPBCH, is then carried out of NPBCH mappings bandwidth range
Take the narrowband reference signal (NRS) under 1/2 antenna port.With the arrowband master sync signal (NPSS) and its unloaded ripple in subframe #5
Power ratio obtain approximate signal to noise ratio (SNR).A threshold value is set (under awgn channel environment, to be suggested according to a large amount of emulation
Span is 10~100), when SNR is more than the threshold value, using power detection method, otherwise using traditional blind check method.
Present invention specific implementation flow chart is illustrated in figure 4, is comprised the following steps：
(1) cell searching and Timing Synchronization are carried out first, determine the position of NPBCH mappings.
(2) in the running time-frequency resource domain of NPBCH mappings, the narrowband reference letter of antenna port the 2000th, 2001 is extracted respectively
Number, r is designated as respectively2000And r (i)2001(i).NPBCH occupies frequency domain 180kHz bandwidth, and rear 11 OFDM positioned at subframe #0 are accorded with
Number, and vacate narrow under the place resource element of the cell reference signals (CRS) under 4 antenna ports (RE) and 2 antenna ports
RE where band reference signal (NRS).The narrowband reference signal (NRS) of each antenna port only occupies 4 in NPBCH resources
OFDM symbol, each OFDM symbol only occupy 2 RE, so the length of the 2 narrowband reference signal sequences extracted is all 8.
(3) arrowband master sync signal (NPSS) and 11 null resource elements (RE) without mapping signal information are extracted, closely
Like the SNR on one RE of estimation.Estimate concretely comprising the following steps for the approximate SNR on a RE：
(a) time-frequency location mapped according to NPSS signals, NPSS signals and 11 moneys without mapping signal information are extracted
Source element (RE).NPSS signals occupy subframe #5 rear 11 OFDM symbols, and frequency domain occupies preceding 11 subcarriers (0~10).
(b) the approximate SNR on a RE is calculated.The empty RE extracted general power P (N) and NPSS signals is calculated first
Approximate SNR cans on general power P (S), a RE are expressed as
(4) according to the system environments of reality, a threshold value is set, is designated as GSNR(under awgn channel environment, according to big
Amount emulation suggests that span is 10~100).When the approximate SNR on a RE is more than GSNRWhen, arrowband ginseng is received using extraction
The power detecting method of signal (NRS) sequence is examined, is otherwise detected using the method for traditional blind check.
In step (4), the power detecting method that extraction receives narrowband reference signal sequence is described in detail as follows：
(a) determine that power ratio threshold value ρ a * SNR, wherein ρ are power ratio threshold coefficient according to SNR, span is 0
Between~1.
(b) 2 reference signal sequence r of extraction are calculated respectively2000And r (i)2001(i) powerWith(can
Its power is calculated using the conventional Calculation Method of this area)
(c) power of narrowband reference signal corresponding to antenna port 2000 is calculatedIt is corresponding with antenna port 2001
The power of narrowband reference signalRatio, i.e.,When the ratio is less than power ratio threshold value, then examine
It is 2 to measure NPBCH transmission antennas port number, and otherwise antenna port number is 1.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limited the scope of the invention.
After the content for having read the record of the present invention, technical staff can make various changes or modifications to the present invention, these equivalent changes
Change and modification equally falls into the scope of the claims in the present invention.
Claims (3)
1. a kind of antenna port number detection method for arrowband Internet of Things, it is characterised in that comprise the following steps：
1), UE carries out cell searching and Timing Synchronization, determines the position of arrowband Physical Broadcast Channel NPBCH mappings；
2), in the time-frequency resource maps of arrowband Physical Broadcast Channel NPBCH mappings, the reference launched according to each antenna port is believed
Number mapping resource element RE where position, respectively extract antenna port 2000,2001 narrowband reference signal NRS；
3), in radio frames where the NPBCH in reception, the position of arrowband master sync signal NPSS mappings is determined, is then extracted narrow
Band master sync signal NPSS signals and null subcarrier, calculate the power of NPSS signals and null subcarrier on a resource element RE
Than being approximate signal to noise ratio snr；
4), when signal to noise ratio snr is more than signal-noise ratio threshold value GSNRWhen, the power that narrowband reference signal sequence is received using extraction is examined
Survey method carries out port number detection, when signal to noise ratio snr is less than or equal to signal-noise ratio threshold value GSNRWhen, entered using traditional blind check method
The method of row detection, determines NPBCH transmission antenna port numbers.Wherein threshold value GSNRSpan, under awgn channel environment
According to a large amount of emulation, it is proposed that be 10~100.
2. the antenna port number detection method according to claim 1 for arrowband Internet of Things, it is characterised in that the step
The power detecting method that rapid 4) extraction receives narrowband reference signal sequence specifically includes step：
(a) according to narrowband reference signal, the power of reference signal at the 2000th, 2001 antenna ports is calculated respectively；
(b) determine that power ratio threshold value ρ a * SNR, wherein ρ are power ratio threshold coefficient according to approximate signal to noise ratio snr, value
Scope is between 0~1；
(c) power of narrowband reference signal corresponding to antenna port 2000 is calculatedJoin with 2001 corresponding arrowband of antenna port
Examine the power of signalRatio, i.e.,When the ratio is less than power ratio threshold value, then detect
NPBCH transmission antennas port number is 2, and otherwise antenna port number is 1.
3. the antenna port number detection method according to claim 2 for arrowband Internet of Things, it is characterised in that the step
It is rapid 3) to calculate the power ratio of NPSS signals and null subcarrier on a resource element RE, it is the specific steps of approximate signal to noise ratio snr
For：
(a) time-frequency location mapped according to NPSS signals, NPSS signals and 11 resource elements without mapping signal information are extracted
Plain RE, NPSS signal occupy subframe #5 rear 11 OFDM symbols, and frequency domain occupies preceding 11 subcarriers；
(b) the approximate SNR on a RE is calculated, calculates the empty RE extracted general power P (N) and the total work of NPSS signals first
Approximate SNR cans on rate P (S), a RE are expressed as
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Cited By (3)
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| CN112005517A (en) * | 2018-04-05 | 2020-11-27 | 高通股份有限公司 | Determining quality of non-anchor carrier using Narrowband Reference Signal (NRS) bins in non-anchor carrier |
| WO2021169547A1 (en) * | 2020-02-27 | 2021-09-02 | 中兴通讯股份有限公司 | Synchronization signal sending method, and electronic device and storage medium |
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Application publication date: 20180227 |