CN109302748B - Frequency selection method and communication method of wireless communication system - Google Patents
Frequency selection method and communication method of wireless communication system Download PDFInfo
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- 238000010187 selection method Methods 0.000 title claims abstract description 8
- 230000001360 synchronised effect Effects 0.000 claims abstract description 56
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a frequency selection method and a communication method of a wireless communication system.A base station searches the center frequency of a working channel in a working frequency band and transmits a synchronous signal by the center frequency; the terminal receives the synchronous signal, completes frequency synchronization and acquires the center frequency of a base station working channel and the receiving power of the synchronous signal; the terminal transmits an uplink signal to communicate with the base station by selecting a sub-channel center frequency according to the power of the synchronizing signal, wherein the smaller the power of the synchronizing signal is, the closer the terminal selects a frequency to the center frequency of the synchronizing signal as the sub-channel center frequency, and the terminal otherwise selects a frequency away from the center frequency of the synchronizing signal as the sub-channel center frequency. The base station working channel bandwidth is divided into a plurality of frequency spectrum partitions, the terminal selects the center frequency of the sub-channel according to the signal intensity to transmit the uplink signal, and the signals with different intensity can be isolated on the frequency distribution, so that the interference of the strong signal on the weak signal is effectively prevented, and the channel capacity is improved.
Description
Technical Field
The invention belongs to the field of wireless communication, and relates to selection of a working channel center frequency by a base station and selection of a carrier frequency by a terminal in the process of wireless communication between the terminal and the base station, in particular to a frequency selection method and a communication method of a wireless communication system.
Background
In the field of wireless communication, interference exists on a wireless spectrum due to the influence of a wireless environment, and in order to ensure the communication quality between a terminal and a base station, the interference needs to be avoided during the communication between the terminal and the base station. In practical situations, in the communication process between the terminal and the base station, the distance between each terminal and the base station is different, the strength of the signal reaching the base station is also different, and the anti-interference capability is also different, so that the strength difference of the terminal signal received by the base station is relatively large, and therefore, the terminal also needs to determine the carrier frequency according to the interference condition on the frequency spectrum. In the FDMA (Frequency Division Multiple Access) system, when different signals arrive at the base station, due to the non-ideality of the radio frequency circuit, the image generated by the signal with high signal power received by the base station is also stronger, if the signal power received by the base station by another terminal is smaller, and the frequency point on the frequency spectrum is closer to the image generated by the signal with high signal power received by the base station as shown in fig. 1, the image of the strong signal will cause interference to the weak signal, which also affects the selection of the carrier frequency. The existing cognitive radio and dynamic spectrum access technology only considers the interference on the wireless spectrum, but does not consider the requirements of the distance between a terminal and a base station, the strength of a signal reaching the base station, the anti-interference capability and the influence of the mirror image of a strong signal on a weak signal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a selection scheme capable of solving the central frequency of a base station working channel and a scheme capable of inhibiting interference caused by the image of a strong signal to a weak signal.
In order to solve the technical problems, the invention adopts the following technical scheme:
a frequency selection method of a wireless communication system, comprising a base station and a plurality of terminals, characterized in that: the base station selects a center frequency for a working channel in a working frequency band, and transmits a synchronous signal, wherein the center frequency of the synchronous signal is the center frequency of the working channel, a terminal receives the synchronous signal to acquire the center frequency and power of the synchronous signal, the terminal selects a sub-channel center frequency to transmit an uplink signal to communicate with the base station through the power of the synchronous signal, the smaller the power of the synchronous signal is, the terminal selects a frequency which is closer to the center frequency of the synchronous signal as the sub-channel center frequency, and otherwise, the terminal selects a frequency which is far away from the center frequency of the synchronous signal as the sub-channel center frequency.
As an improvement, a power threshold P is set for the power of the terminal receiving the synchronization signal 0 Dividing the working channel into two frequency spectrum regions, namely a near center frequency spectrum region and a far center frequency spectrum region by taking the center frequency as a symmetrical point, when the power P of a synchronous signal received by a terminal is not more than a power threshold P 0 When the terminal selects the center frequency of the sub-channel in the near-center frequency spectrum region, the terminal receives the synchronizationThe signal power P is greater than the power threshold P 0 And selecting the center frequency of the sub-channel in the far center frequency spectrum region by the terminal.
As an improvement, the center frequency of the working channel of the base station is obtained by searching in the working frequency band, the working channel bandwidth BW1 of the base station is obtained by searching in the base station for a section of clean frequency band with the bandwidth BW2, the interference in the clean frequency band is smaller than the set threshold, and the center frequency of the clean frequency band is set as the center frequency f of the working channel of the base station 0 I.e. search for
If the in-range interference is less than the set threshold, then the base station operating channel is selected to be
In the range, the bandwidth is BW1, and BW2 < BW1.
As an improvement, the bandwidth of the working sub-channel of the terminal is BW3, BW3 is less than BW2, and the frequency range of the near-center frequency spectrum region is
The frequency range of the far-center frequency spectrum region is as follows:
As an improvement, the working channel is set at the center frequency f 0 Dividing a plurality of frequency spectrum regions for symmetry points, wherein the plurality of frequency spectrum regions are S sequentially from near to far from the center frequency 1 ，S 2 ，S 3 ......S n N is the number of frequency spectrum regions, n is more than or equal to 2, each frequency spectrum region comprises two frequency bands symmetrical with the center frequency, and n-1 power thresholds are correspondingly set for the power of a terminal receiving a synchronous signal and are respectively P 1 ，P 2 ...P n-1 The power P of the synchronous signal received by the terminal is not more than P 1 In S 1 The frequency spectrum region selects the center frequency of the sub-channel, and the power P of the synchronous signal is P 1 And P 2 Between, at S 2 The spectral region selects the center frequency of the sub-channel, and according to this rule, the synchronization signal power P is at P n-2 And P n-1 Between, at S n-2 The frequency spectrum region selects the center frequency of the sub-channel, and the power P of the synchronous signal is larger than P n-1 In S n The spectral region selects a subchannel center frequency.
As an improvement, the terminal receives the synchronization signal through the antenna and acquires the center frequency of the synchronization signal and the power of the synchronization signal.
A communication method of a wireless communication system including a base station and a plurality of terminals, comprising the steps of:
step 1, a base station searches the center frequency of a working channel in a working frequency band, and transmits a synchronous signal according to the center frequency;
step 2, the terminal receives the synchronous signal, completes frequency synchronization, and acquires the center frequency of a base station working channel and the receiving power of the synchronous signal;
and 3, the terminal selects a sub-channel center frequency to transmit an uplink signal to communicate with the base station through the power of the synchronous signal, wherein the smaller the power of the synchronous signal is, the terminal selects a frequency which is closer to the center frequency of the synchronous signal as the sub-channel center frequency, otherwise, the terminal selects a frequency which is far from the center frequency of the synchronous signal as the sub-channel center frequency, and the sub-channel bandwidth is smaller than the working channel bandwidth.
As an improvement, the base station searches a clean band with a bandwidth BW2 by using the central frequency of the clean band as the central frequency f of the base station working channel 0 BW2 is smaller than BW1, after receiving the synchronous signal, the terminal determines that the synchronous signal power P is not greater than the power threshold P 0 The terminal is at
Internally selecting a sub-channel center frequency; if the synchronization signal power P is greater than the power threshold P 0 The terminal is +.>
And
the center frequency of the sub-channel is selected internally.
Compared with the prior art, the invention has the beneficial effects that:
1. the base station working channel bandwidth of the invention is divided into a plurality of frequency spectrum partitions, the signal power of the terminals distributed to different frequency spectrum partitions is different, the frequency spectrum partition near the channel center frequency has smaller signal power of the terminals received by the base station, the frequency spectrum partition far from the channel center frequency has larger signal power of the terminals received by the base station, and the frequency spectrum partition adopts symmetrical frequency spectrum partitions, such as strong signals in S n The spectrum is partitioned and its mirror image is at S 1 The spectrum is partitioned because the mirror image of the signal and the signal are symmetric about the center frequency of the channel, the weak signal is at S 1 The frequency spectrum partition can effectively solve the problem that a plurality of terminal signals in one channel avoid the interference of the mirror image of a strong signal on a weak signal;
2. the terminal frequency allocation scheme of the invention can fully utilize the channel bandwidth of the invention, and improve the channel capacity;
3. the selection scheme of the base station channel center frequency can improve the success rate of the weak signal analysis accuracy.
Drawings
FIG. 1 is a graph of an interference spectrum of an image of a strong signal versus a weak signal in the prior art;
FIG. 2 illustrates a frequency adjustment of a weak signal to a spectral center plot in an embodiment of the present invention;
FIG. 3 is a diagram of a base station search selection channel center frequency in an embodiment of the present invention;
fig. 4 is a diagram of a base station operating channel band allocation in an embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
The technical scheme adopted by the invention is that the terminal with low signal power reaching the base station is distributed near the center frequency of the base station working channel, and the terminal with strong signal power reaching the base station is distributed far from the center frequency of the base station working channel as shown in figure 2.
The communication system of the embodiment adopts a narrow-band communication technology, the bandwidth of a working channel of a base station is BW1, and one base station selects one working channel in a specified frequency band range; the working subchannel bandwidth of one terminal is BW3, BW3< BW1.
The base station adopts the center frequency of the working channel to transmit the synchronous signal, the terminal receives the synchronous signal, the frequency synchronization is completed, and the center frequency of the working channel of the base station is obtained.
The terminal receives the synchronous signal through the antenna and acquires the center frequency of the synchronous signal and the power of the synchronous signal.
In the communication process between two terminals and a base station, the base station does not tell the center frequency of a sub-channel to be transmitted by the terminal, and the result is that the signal of the 8081 frequency point is interfered by the 7993 frequency point, and the 7993 frequency point is the mirror image of the 201 frequency point of the signal. In this case, signal analysis at the 8081 frequency point is affected.
Fig. 2 illustrates that in the communication process between the terminal and the base station, the base station tells the terminal that the center frequency of the sub-channel is to be transmitted, and the allocation scheme is to allocate the center frequency of the sub-channel of the terminal with low power of the received synchronization signal to the vicinity of the center frequency of the channel, and allocate the high power of the signal to the center frequency far away from the channel, so that the frequency point of the signal in fig. 1 is 8081, and is allocated to the 4041 frequency point in fig. 2, so that the interference of the 7993 frequency point can be avoided.
The base station may search in the operating frequency band, and if the channel selected by the base station interferes too much, the interference may also affect the terminal with the smaller signal power if the signal power transmitted by the terminal is too small, so the base station also selects a suitable operating channel. The specific method is that if a section of clean band with bandwidth BW2 is searched, the interference in the clean band is smaller than the set threshold, the spectrum like the situation of figure 3 finds the clean bandwidth with BW2, because the wireless environment is complex, the threshold needs to be determined according to the actual situation, and is generally set as the thermal noise power plus a positive number slightly larger than 0, and the thermal noise power calculation method
K: boltzmann constant, =1.38×10 -23 J/K；
T: the Kelvin temperature is 290K at normal temperature;
w: a signal bandwidth;
1. regarding the spectral density of thermal noise, which is understood to be the background noise within the 1Hz bandwidth, the spectral density is then:
10lg (KTW) =10 lg (1.38x10-23J/K290 x 1 hz) = -203.9772292 dbw= -173.9772292dbm≡174dB m; i.e. the spectral density of thermal noise is about-174 dBm. With the center frequency of the bandwidth of BW2 as the center frequency of the base station operating channel, then the center frequencies are 62.5kHz to the left and 62.5kHz to the right, and a total of 125kHz bandwidth constitutes an operating channel with a bandwidth of bw1=125 kHz, with BW2 < BW1. In the first communication between the terminal and the base station, the base station tells the center frequency of the terminal channel, the terminal selects its own center frequency of the sub-channel for transmitting uplink signals according to the strength of the synchronization signal of the receiving base station, and there is a threshold P (the specific threshold is determined by the actual situation) according to the strength of the synchronization signal of the receiving base station, for example, the power of the synchronization signal of the receiving base station is lower than the threshold, the center frequency of the sub-channel for transmitting uplink signals of the terminal will be selected near the center frequency of the channel, and if the center frequency of the channel is 0Hz, the center frequency of the sub-channel for transmitting uplink signals of the terminal will be at the center frequency of the sub-channel for transmitting uplink signals of the terminal
Internal selection; the power of the base station synchronous signal received by the terminal is higher than the threshold, the center frequency of the sub-channel of the uplink signal transmitted by the terminal is selected in a range far away from the center frequency of the channel, and when the center frequency of the channel is 0, the center frequency of the sub-channel of the uplink signal transmitted by the terminal is selected in the range far away from the center frequency of the channel
In this embodiment, the bandwidth of the sub-working channel of the terminal is equal to BW3, and BW3 is less than BW2.
As a preferred embodiment, the bandwidth of the working channel of the base station is divided into a plurality of frequency spectrum partitions from near to far according to the center frequency, specifically into A, B and C three frequency spectrum partitions, each frequency spectrum partition comprises two frequency bands symmetrical about the center frequency, the frequency spectrum partition A comprises two frequency bands A1 and A2, the frequency spectrum partition B comprises two frequency bands B1 and B2, the frequency spectrum partition C comprises two frequency bands C1 and C2, wherein A1 and A2 are the center frequencies of the working channels of the base station in close proximity, and 2 thresholds P1 and P2 are set (P1 and P2 are determined according to practical conditions). A1 and A2 are symmetrical about the center frequency of the base station working channel, and assuming that the center frequency of the base station working channel is 0, A1 corresponds to [0,20kHz ], A2 corresponds to [ -20kHz,0], when the power of the base station synchronous signal received by the terminal is not more than P1, the frequency spectrum partition selected by the terminal is A partition, namely, the center frequency of the sub-channel is randomly selected in the frequency band A1 or A2. B1 and B2 are symmetrical about the central frequency of the base station working channel, B1 corresponds to [20kHz,40kHz ], B2 corresponds to [ -40kHz, -20kHz ], when the power of the base station synchronous signal received by the terminal is larger than P1 and is not larger than P2, the frequency spectrum partition selected by the terminal is B partition, namely, the central frequency of the sub-channel is randomly selected in the B1 or B2 frequency band. C1 and C2 are symmetrical about the center frequency of the base station working channel, C1 corresponds to [40kHz,62.5kHz ], C2 corresponds to [ -62.5kHz, -40kHz ], when the power of the base station synchronizing signal received by the terminal is larger than P2, the frequency spectrum partition selected by the terminal is C partition, namely, the center frequency of the sub-channel is randomly selected in the frequency band of C1 or C2. The advantage of dividing the frequency bands is that the power of the terminal signal received by the base station can be divided into several levels, so that the difference of the power of the terminal signal received by the base station in each level is reduced, and the interference of the strong signal to the relatively weak signal in the same frequency band can be avoided.
Claims (5)
1. A frequency selection method of a wireless communication system, comprising a base station and a plurality of terminals, characterized in that: the base station selects a center frequency for a working channel in a working frequency band and transmits a synchronous signal, wherein the center frequency of the synchronous signal is the center frequency of the working channel, a terminal receives the synchronous signal to acquire the center frequency and power of the synchronous signal, the terminal selects a sub-channel center frequency to transmit an uplink signal to communicate with the base station through the power of the synchronous signal, the smaller the power of the synchronous signal is, the terminal selects a frequency which is closer to the center frequency of the synchronous signal as the sub-channel center frequency, and otherwise, the terminal selects a frequency which is far from the center frequency of the synchronous signal as the sub-channel center frequency;
the central frequency of the working channel of the base station is obtained by searching in the working frequency band, the working channel bandwidth BW1 of the base station is obtained by searching a section of clean frequency band with the bandwidth BW2 in the base station, the interference in the clean frequency band is smaller than a set threshold, and the central frequency of the clean frequency band is set as the central frequency f of the working channel of the base station 0 I.e. search for
If the in-range interference is less than the set threshold, then the base station operating channel is selected to be
In the range, the bandwidth is BW1 and BW2<BW1；
Operating channel at center frequency f 0 Dividing a plurality of frequency spectrum regions for symmetry points, wherein the plurality of frequency spectrum regions are S sequentially from near to far from the center frequency 1 ，S 2 ，S 3 ......S n N is the number of frequency spectrum regions, n is more than or equal to 2, each frequency spectrum region comprises two frequency bands symmetrical with the center frequency, and n-1 power thresholds are correspondingly set for the power of a terminal receiving a synchronous signal and are respectively P 1 ，P 2 ...P n-1 The power P of the synchronous signal received by the terminal is not more than P 1 In S 1 The frequency spectrum region selects the center frequency of the sub-channel, and the power P of the synchronous signal is P 1 And P 2 Between, at S 2 The spectral region selects the center frequency of the sub-channel, and according to this rule, the synchronization signal power P is at P n-2 And P n-1 Between, at S n-2 The frequency spectrum region selects the center frequency of the sub-channel, and the power P of the synchronous signal is larger than P n-1 In S n The spectral region selects a subchannel center frequency.
2. The frequency selective party of claim 1The method is characterized in that: setting a power threshold P for the power of the terminal receiving the synchronization signal 0 Dividing the working channel into two frequency spectrum regions, namely a near center frequency spectrum region and a far center frequency spectrum region by taking the center frequency as a symmetrical point, when the power P of a synchronous signal received by a terminal is not more than a power threshold P 0 When the power P of the synchronous signal received by the terminal is greater than the power threshold P 0 And selecting the center frequency of the sub-channel in the far center frequency spectrum region by the terminal.
3. The frequency selection method of claim 2, wherein: the bandwidth of the working sub-channel of the terminal is BW3, and BW3<BW2, the frequency range of the near-center frequency spectrum region is
The frequency range of the far-center frequency spectrum region is as follows:
4. A frequency selection method as claimed in any one of claims 1 to 3, characterized by: the terminal receives the synchronous signal through the antenna and acquires the center frequency of the synchronous signal and the power of the synchronous signal.
5. A communication method of a wireless communication system including a base station and a plurality of terminals, comprising the steps of:
step 1, a base station searches the center frequency of a working channel in a working frequency band, and transmits a synchronous signal according to the center frequency;
step 2, the terminal receives the synchronous signal, completes frequency synchronization, and acquires the center frequency of a base station working channel and the receiving power of the synchronous signal;
step 3, the terminal selects a sub-channel center frequency to transmit an uplink signal to communicate with the base station through the power of the synchronous signal, the smaller the power of the synchronous signal is, the closer the terminal selects the frequency to be the sub-channel center frequency, otherwise, the terminal selects the frequency away from the center frequency of the synchronous signal to be the sub-channel center frequency;
the working channel bandwidth BW1 of the base station, the base station searches a clean frequency band with the bandwidth BW2, and the center frequency of the clean frequency band is taken as the center frequency f of the working channel of the base station 0 ，BW2<BW1, after receiving the synchronization signal, if the synchronization signal power P is not greater than the power threshold P 0 The terminal is at
Internally selecting a sub-channel center frequency; if the synchronization signal power P is greater than the power threshold P 0 The terminal is +.>
And->
The center frequency of the sub-channel is selected internally. />
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Effective date of registration: 20200527 Address after: 201100 Room 802, building 3, No. 1308, Lianhua Road, Minhang District, Shanghai Applicant after: Shanghai Road Bio Technology Co.,Ltd. Address before: 430075 Hubei Wuhan city East Lake high tech Zone new avenue 999 Future City Longshan Pioneer Park F1 1001 unit Applicant before: WUHAN TURBO TECHNOLOGIES Corp. |
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Address after: 201800 5th floor, building 4, 333 Huangqing Road, Jiading District, Shanghai Applicant after: Shanghai Road Bio Technology Co.,Ltd. Address before: Room 802, building 3, No. 1308, Lianhua Road, Minhang District, Shanghai 201100 Applicant before: Shanghai Road Bio Technology Co.,Ltd. |
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