CN109348524B - Frequency band searching method and device - Google Patents
Frequency band searching method and device Download PDFInfo
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- CN109348524B CN109348524B CN201811321200.1A CN201811321200A CN109348524B CN 109348524 B CN109348524 B CN 109348524B CN 201811321200 A CN201811321200 A CN 201811321200A CN 109348524 B CN109348524 B CN 109348524B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a frequency band searching method and a frequency band searching device, which are applied to the technical field of wireless communication. The method comprises the following steps: receiving a time domain signal of each evaluation frequency point in a plurality of evaluation frequency points in a frequency band according to a first antenna connection mode, and obtaining the signal intensity statistic of the time domain signal of each evaluation frequency point; judging whether the signal intensity statistics of the time domain signals of the multiple evaluation frequency points are all smaller than a preset power threshold; and when the signal intensity statistics of the time domain signals of the multiple evaluation frequency points are all smaller than a preset power threshold, replacing to search the frequency band again according to a second antenna connection mode. By the mode, the invention can ensure that the robustness is not reduced, greatly reducing the time consumption of frequency band searching.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a frequency band searching method and apparatus.
Background
In wireless communication, a terminal (User Equipment, UE) needs to detect whether there is a Long Term Evolution (LTE) signal in a configured frequency band when the frequency band configuration is known. If LTE signals exist, further confirmation is needed for determining which frequency points are in order to try to reside in the cell of the LTE system at the frequency points. The longer the frequency band searching time is, the worse the user experience is, and the larger the power consumption of the terminal is. In order to increase the frequency band searching speed, the frequency band searching usually adopts a sequencing structure, and a plurality of evaluation frequency points are generally selected at equal intervals in the frequency band, and each evaluation frequency point corresponds to a frequency point window. And sequencing the evaluation frequency points according to certain measurement, and then sequencing all the frequency points in the frequency point window corresponding to the evaluation frequency points.
The LTE mode of the terminal mostly adopts two channels, which are divided into a main set channel and a diversity channel, the main set channel is responsible for receiving downlink LTE signals and sending uplink LTE signals, and the diversity channel is only responsible for receiving downlink LTE signals. When the terminal supports multiple modes to operate simultaneously, the LTE diversity channel is usually co-antenna with other modes, such as global system for mobile communications (GSM). The antennas connected to the main set path are referred to as main set antennas for short, and the antennas connected to the diversity path are referred to as diversity antennas for short. When a hand holds a certain antenna position, the quality of signals received by a channel corresponding to the antenna is poor, the signal power is reduced by dozens of db (decibel), and the searching performance is reduced. For a multimode terminal with a metal housing, when a user holds the LTE main set antenna and the LTE diversity antenna is occupied by other modes, such as GSM, the received LTE signal quality is poor, and the LTE cell cannot be searched. If this happens during the LTE band search phase, it will result in the terminal not camping on the LTE cell where the LTE signal power is good.
The existing solution is as follows: for each frequency band, firstly carrying out LTE frequency band search once according to an antenna direct connection mode, and if an LTE cell is searched, finishing the frequency band search; if the LTE cell is not searched after the whole frequency band search is completed, the LTE frequency band search needs to be carried out on the same frequency band again according to an antenna crossing mode. As shown in fig. 1, the metal-casing multimode terminal LTE has two antennas, ant1 and Ant2 respectively. The user holds on Ant 1. When the antenna is through, as shown in a diagram a in fig. 1, the LTE master set channel LTE TRx is connected to Ant1, and since the user holds Ant1 in his hand, the received signal quality of this channel is poor. The LTE diversity channel LTE DRx is connected with Ant2, and the GSM system occupies Ant2, so the channel can not receive LTE signals. When the antennas are crossed, as shown in the diagram b in fig. 1, the LTE master set channels LTE TRx and Ant2 are connected, and the antennas held by the user are avoided, so that the channels can normally receive LTE signals. The LTE diversity channel LTE DRx is connected with Ant1, and the GSM system occupies Ant1, so the channel can not receive LTE signals.
At present, a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) mode of a terminal mostly has only 1 main set channel, and is responsible for receiving downlink and transmitting uplink TD-SCDMA signals. Although there is no problem that the diversity antenna is occupied by other modes, when the user holds the TD-SCDMA main set antenna of the metal casing terminal, if antenna switching is not adopted, the quality of the received TD-SCDMA signal is poor, and the TD-SCDMA cell cannot be searched. If the situation occurs in the TD-SCDMA frequency band searching stage, the terminal cannot stay in the TD-SCDMA cell in a place with good TD-SCDMA signal quality.
According to the prior art, although the frequency band searching scheme is simple, the optimal antenna connection mode cannot be intelligently identified, the time for searching the frequency band in the worst scene is too long, compared with the single frequency band searching, the time for searching the frequency band in the worst scene is doubled, and the user experience is seriously influenced.
Disclosure of Invention
The embodiment of the invention provides a frequency band searching method and device, which can greatly reduce the time consumption of frequency band searching without reducing the robustness.
A first aspect provides a frequency band searching method, including: receiving a time domain signal of each evaluation frequency point in a plurality of evaluation frequency points in a frequency band according to a first antenna connection mode, and obtaining the time domain of each evaluation frequency point a signal strength statistic of the signal; judging signals of time domain signals of a plurality of evaluation frequency points whether the intensity statistics are all smaller than a preset power threshold or not; and when the signal intensity statistics of the time domain signals of the multiple evaluation frequency points are all smaller than a preset power threshold, replacing to search the frequency band again according to a second antenna connection mode.
With reference to the implementation manner of the first aspect, in a first possible implementation manner, the method further includes: and if the signal intensity statistic of the time domain signal of at least one evaluation frequency point in the plurality of evaluation frequency points is not less than the power threshold, continuing to search the frequency band according to the first antenna connection mode.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, receiving a time domain signal of each of a plurality of frequency points in a frequency band, and obtaining a synchronization signal based on the time domain signals of the plurality of frequency points; wherein at least one frequency point in the plurality of frequency points is included between two adjacent evaluation frequency points.
With reference to the first aspect, the first possible implementation manner and the second possible implementation manner of the first aspect, in a third possible implementation manner, the first antenna connection manner is to search a frequency band through a first antenna, and the second antenna connection manner is to search a frequency band through a second antenna outside the first antenna.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, in the first antenna connection manner, the main set receiving channel is connected to the first antenna, and the diversity receiving channel is connected to the second antenna; in a second antenna connection mode, the main set receiving channel is connected with the second antenna, and the diversity receiving channel is connected with the first antenna.
With reference to the first aspect, the first possible, the second possible, the third possible, and the fourth possible implementation manners of the first aspect, in a fifth possible implementation manner, the obtaining a signal strength statistic of a time domain signal of an evaluation frequency point includes: and counting the received signal strength in the preset bandwidth with the evaluation frequency point as the central frequency point to obtain the signal strength statistic.
A second aspect provides a frequency band searching apparatus, including: a searching module for receiving time domain signals of each evaluation frequency point in a plurality of evaluation frequency points in a frequency band according to a first antenna connection mode, obtaining the signal intensity statistics of the time domain signals of each evaluation frequency point; the judging module is connected with the searching module and used for judging whether the signal intensity statistics of the time domain signals of the plurality of evaluation frequency points are all smaller than a preset power threshold; and the replacing module is connected with the judging module and used for replacing the frequency band searching again according to the second antenna connection mode when the signal intensity statistics of the time domain signals of the plurality of evaluation frequency points are all smaller than the preset power threshold.
With reference to the implementation manner of the second aspect, in a first possible implementation manner, if the determining module determines that the signal strength statistic of the time domain signal of at least one evaluation frequency point in the multiple evaluation frequency points is not less than the power threshold, the searching module continues to perform frequency searching according to the first antenna connection manner.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the apparatus further includes a synchronization module, configured to receive a time domain signal of each of multiple frequency points in a frequency band, and obtain a synchronization signal based on the time domain signals of the multiple frequency points; wherein at least one frequency point in the plurality of frequency points is included between two adjacent evaluation frequency points.
With reference to the second aspect and the first possible implementation manner and the second possible implementation manner of the second aspect, in a third possible implementation manner, the first antenna connection manner is that a frequency band is searched through a first antenna, and the second antenna connection manner is that a frequency band is searched through a second antenna outside the first antenna.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, in the first antenna connection manner, the main set receiving channel is connected to the first antenna, and the diversity receiving channel is connected to the second antenna; in a second antenna connection mode, the main set receiving channel is connected with the second antenna, and the diversity receiving channel is connected with the first antenna.
With reference to the second aspect, the first possible, the second possible, the third possible, and the fourth possible implementation manners of the second aspect, in a fifth possible implementation manner, the search module is configured to: and counting the received signal strength in the preset bandwidth with the evaluation frequency point as the central frequency point to obtain the signal strength statistic.
The embodiment of the invention has the beneficial effects that: receiving a time domain signal of each evaluation frequency point in a plurality of evaluation frequency points in a frequency band in a first antenna connection mode, and obtaining signal intensity statistics of the time domain signal of each evaluation frequency point; judging whether the signal intensity statistics of the time domain signals of the multiple evaluation frequency points are all smaller than a preset power threshold; when the signal intensity statistics of the time domain signals of the multiple evaluation frequency points are all smaller than the preset power threshold, frequency band searching is performed again according to a second antenna connection mode instead, so that the increased time consumption only depends on the time consumption of the statistics and is far shorter than the time of single frequency band searching, and thus the time consumption of frequency band searching can be greatly reduced while the robustness is not reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic diagram of a method for antenna switching in the prior art;
fig. 2 is a schematic flow chart of a frequency band searching method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a frequency band searching apparatus according to a first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a frequency band searching apparatus according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the drawings and embodiments.
Referring to fig. 2, fig. 2 is a schematic flow chart of a frequency band searching method according to an embodiment of the present invention. The frequency band searching is to search whether there is a wireless communication signal in the frequency band. As shown in fig. 2, the frequency band searching method includes:
s10: receiving the time domain signal of each evaluation frequency point in a plurality of evaluation frequency points in a frequency band according to a first antenna connection mode, and obtaining the signal intensity statistics of the time domain signal of each evaluation frequency point.
The first antenna connection mode is that a frequency band is searched through the first antenna. In the first antenna connection mode, the main diversity channel is connected with the first antenna, and the diversity channel is connected with the second antenna, namely, the antenna through connection mode. For the LTE system, the main diversity channel is responsible for receiving downlink LTE signals and transmitting uplink LTE signals, and the diversity channel is responsible for receiving downlink LTE signals and shares an antenna with the GSM system. For the TD-SCDMA system, the main channel is responsible for receiving downlink and sending uplink TD-SCDMA signals, and the diversity channel is not occupied by other modes.
In the embodiment of the invention, a plurality of frequency points in the frequency band are generally selected at equal intervals as evaluation frequency points of the frequency band. The spacing size is generally related to the bandwidth of the Received Signal Strength Indication (RSSI) statistics at this frequency bin. And a plurality of frequency points are included between two adjacent evaluation frequency points.
S11: and judging whether the signal intensity statistics of the time domain signals of the multiple evaluation frequency points are all smaller than a preset power threshold.
Wherein the signal strength statistic of the time domain signal is the antenna port (antenna port) power. For the LTE system, the antenna port power is obtained by calculating the Received Signal Strength (RSSI) of a 1.08M bandwidth Signal with an evaluation frequency point as a central frequency point and performing conversion. For the TD-SCDMA system, the antenna port power is obtained by receiving the time domain signal in the 1.28M bandwidth with the evaluation frequency point as the central frequency point, performing frame synchronization to obtain the received signal strength of the downlink pilot frequency time slot signal, and performing conversion. The interval between adjacent frequency points of the TD-SCDMA system is 200KHz.
S12: and when the signal intensity statistics of the time domain signals of the multiple evaluation frequency points are all smaller than a preset power threshold, replacing to search the frequency band again according to a second antenna connection mode.
The second antenna connection mode is to search a frequency band through a second antenna outside the first antenna. In the second antenna connection mode, the main diversity channel is connected with the second antenna, and the diversity channel is connected with the first antenna, namely, the antenna cross connection mode. In another embodiment of the present invention, the first antenna connection method may be an antenna cross connection, and the second antenna connection method may be an antenna through connection method.
The third Generation Partnership project (3 rd Generation Partnership project,3 GPP) has 504 physical cell identities in the 3GPP LTE system, divided into 168 distinct groups of 3 distinct cells each.
Wherein
In order to identify the physical cell,
represents a group number in the range of 0 to 167,
represents an intra-group number in the range of 0 to 2. Thus each physical cell identity
Corresponding to only one group number
And intra-group numbering
The LTE system performs cell search using PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal). PSS frequency domain signal generated by
3 are uniquely determined. SSS frequency domain signal channel
And the position of the field (first field or second field) where the SSS signal is located is determined for a fixed field
And the field position of SSS signal, SSS signal is 168. The frequency band searching process of the terminal is as follows: receiving a time domain signal, and eliminating time domain interference of a synchronous signal to the received time domain signal; the time domain signal after interference elimination and the PSS signal (total 3 sequences) pre-stored locally are used for detecting the PSS signal synchronization position, and meanwhile, the corresponding PSS signal synchronization position can be detected
And obtaining an estimated value of the frequency offset; and extracting a synchronization signal from a time domain received signal based on the detected PSS signal synchronization position, performing frequency offset correction and SSS detection to obtain a cell ID, a frame synchronization position and a Cyclic Prefix (CP) type (the CP is divided into a short CP and a long CP, the short CP is marked as NCP, and the long CP is marked as ECP).
When searching the frequency band, if the signal intensity statistic of the time domain signal of at least one evaluation frequency point in the plurality of evaluation frequency points is not less than the power threshold, continuing searching the frequency band according to a first antenna connection mode, namely receiving the time domain signal of each frequency point in the plurality of frequency points in the frequency band, and obtaining a synchronous signal based on the time domain signals of the plurality of frequency points; until the frequency band searching of the frequency band is finished. Wherein at least one frequency point in the plurality of frequency points is included between two adjacent evaluation frequency points.
The judgment of the embodiment of the invention only depends on the statistics of the existing frequency band searching scheme, and the time consumption of frequency band searching is not increased when the antenna is not required to be switched. When the antenna switching is needed, the added time consumption only depends on the time consumption of the statistic, and the time consumption is far less than the time of single frequency band searching. Therefore, the time consumption of frequency band searching can be greatly reduced without reducing the robustness.
The frequency band searching method of the embodiment of the invention is independently carried out on each frequency band, namely whether switching is needed or not is independently processed on each frequency band, searching of the next frequency band is carried out after searching of one frequency band is finished, and whether the antenna connection mode needs to be replaced or not is judged again to carry out frequency band searching.
Fig. 3 is a schematic structural diagram of a frequency band searching apparatus according to a first embodiment of the present invention. As shown in fig. 3, the frequency band search apparatus 10 includes: a search module 11, a judgment module 12 and a replacement module 13. The search module 11 is configured to receive a time domain signal of each evaluation frequency point in a plurality of evaluation frequency points in a frequency band in a first antenna connection manner, and obtain a signal intensity statistic of the time domain signal of each evaluation frequency point. The judging module 12 is connected to the searching module 11, and is configured to judge whether signal strength statistics of time domain signals of multiple evaluation frequency points are all smaller than a preset power threshold. The replacing module 13 is connected to the judging module 12, and configured to replace the searching module 11 to perform frequency band searching again according to the second antenna connection mode when the signal strength statistics of the time domain signals of the multiple evaluation frequency points are all smaller than the preset power threshold.
The first antenna connection mode is to search a frequency band through a first antenna. In the first antenna connection mode, the main set receiving channel is connected with the first antenna, and the diversity receiving channel is connected with the second antenna, namely, the antenna through connection mode. For the LTE system, the main diversity channel is responsible for receiving downlink LTE signals and sending uplink LTE signals, and the diversity channel is responsible for receiving downlink LTE signals and shares an antenna with GSM. For the TD-SCDMA system, the main channel is responsible for receiving downlink and sending uplink TD-SCDMA signals, and the diversity channel is not occupied by other modules. The second antenna connection mode is to search a frequency band through a second antenna outside the first antenna. In the second antenna connection mode, the main set receiving channel is connected with the second antenna, and the diversity receiving channel is connected with the first antenna, namely, the antenna is in cross connection. Specifically, for LTE systems, the diversity channel is responsible for receiving downlink and transmitting uplink LTE signals. For the TD-SCDMA system, the diversity channel is responsible for receiving downlink and sending uplink TD-SCDMA signals.
In the embodiment of the invention, a plurality of frequency points in the frequency band are generally selected at equal intervals as the evaluation frequency points of the frequency band. The spacing size is generally related to the bandwidth over which the received signal strength statistics are performed at that frequency bin. And a plurality of frequency points are included between two adjacent evaluation frequency points. During frequency band searching, the searching module 11 is configured to: and counting the received signal strength in the preset bandwidth with the evaluation frequency point as the central frequency point to obtain the signal strength statistic. If the judging module 12 judges that the signal intensity statistic of the time domain signal of at least one evaluation frequency point in the multiple evaluation frequency points is not smaller than the preset power threshold, the searching module 11 continues to perform frequency searching according to the first antenna connection mode until the frequency band searching of the frequency band is finished. The device also comprises a synchronization module 14, which is used for receiving the time domain signals of each frequency point in the frequency band and obtaining the synchronization signals based on the time domain signals of the frequency points; wherein at least one frequency point in the plurality of frequency points is included between two adjacent evaluation frequency points. The judgment of the embodiment of the invention only depends on the statistic of the existing frequency band searching scheme, and does not increase the time consumption of frequency band searching when the antenna does not need to be switched. When the antenna switching is needed, the added time consumption only depends on the time consumption of the statistic, and the time consumption is far less than the time of single frequency band searching. Therefore, the time consumption of frequency band searching can be greatly reduced without reducing the robustness.
In the embodiment of the present invention, the frequency band searching apparatus 10 may be applied to an LTE system, where the antenna port power is obtained by calculating and evaluating the received signal strength of a 1.08M bandwidth signal with a frequency point as a center frequency point by a searching module, and performing conversion. The frequency band searching apparatus 10 may also be applied to TD-SCDMA, wherein the antenna port power is obtained by receiving a time domain signal within 1.28M bandwidth with an evaluation frequency point as a central frequency point by a searching module, performing frame synchronization to obtain a received signal strength of a downlink pilot time slot signal, and performing conversion. The interval between adjacent frequency points of the TD-SCDMA system is 200KHz.
In the above embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may substantially or partially contribute to the prior art, or all or part of the technical solution may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
Fig. 4 is a schematic structural diagram of a frequency band searching apparatus according to a second embodiment of the present invention. As shown in fig. 4, the frequency band searching apparatus 20 includes: the transceiver 21, the processor 22, the memory 23 and the data bus 24, wherein the receiver 21, the processor 22 and the memory 23 are respectively connected with the data bus 24 for data interaction through the data bus 24. The memory 23 contains the necessary driver software needed for the processor 22 to run so that the processor 22 operates under the software.
The transceiver 21 receives the time domain signal of each evaluation frequency point in a plurality of evaluation frequency points in a frequency band in a first antenna connection mode, and obtains the signal intensity statistic of the time domain signal of each evaluation frequency point. The processor 22 determines whether the signal strength statistics of the time domain signals of the multiple evaluation frequency points are all smaller than a preset power threshold. And when the signal strength statistics of the time domain signals of the multiple evaluation frequency points are all smaller than the preset power threshold, the processor 22 outputs an indication signal to the transceiver 21, and the transceiver performs frequency band searching again according to the second antenna connection mode instead of the indication signal. The specific frequency band search process of the transceiver 21 can be referred to the description of the previous method embodiment.
The first antenna connection mode is to search a frequency band through a first antenna. In the first antenna connection mode, the main set receiving channel is connected with the first antenna, and the diversity receiving channel is connected with the second antenna, namely, the antenna through connection mode. For the LTE system, the main diversity channel is responsible for receiving downlink LTE signals and transmitting uplink LTE signals, and the diversity channel is responsible for receiving downlink LTE signals and shares an antenna with GSM. For the TD-SCDMA system, the main channel is responsible for receiving downlink and sending uplink TD-SCDMA signals, and the diversity channel is not occupied by other modules. The second antenna connection mode is to search a frequency band through a second antenna outside the first antenna. In the second antenna connection mode, the main set receiving channel is connected with the second antenna, and the diversity receiving channel is connected with the first antenna, namely, the antenna is in cross connection. Specifically, for LTE systems, the diversity channel is responsible for receiving downlink and transmitting uplink LTE signals. For the TD-SCDMA system, the diversity channel is responsible for receiving downlink and sending uplink TD-SCDMA signals.
In the embodiment of the invention, a plurality of frequency points in the frequency band are generally selected at equal intervals as evaluation frequency points of the frequency band. The spacing size is generally related to the bandwidth over which the received signal strength statistics are performed at that frequency bin. And a plurality of frequency points are included between two adjacent evaluation frequency points. In the frequency band search, the transceiver 21 counts the received signal strength within a preset bandwidth with the evaluation frequency point as a center frequency point to obtain a signal strength statistic. If the processor 22 determines that the signal strength statistic of the time domain signal of at least one evaluation frequency point in the plurality of evaluation frequency points is not less than the preset power threshold, the transceiver 21 is further instructed to continue frequency search according to the first antenna connection mode until the frequency band search of the frequency band is finished. The transceiver 21 further receives time domain signals of each of a plurality of frequency points in the frequency band, and obtains synchronization signals based on the time domain signals of the plurality of frequency points; wherein at least one frequency point in the plurality of frequency points is included between two adjacent evaluation frequency points. The judgment of the embodiment of the invention only depends on the statistic of the existing frequency band searching scheme, and does not increase the time consumption of frequency band searching when the antenna does not need to be switched. When the antenna switching is needed, the added time consumption only depends on the time consumption of the statistic, and the time consumption is far less than the time of single frequency band searching. Therefore, the time consumption of frequency band searching can be greatly reduced without reducing the robustness.
The frequency band searching device 20 can be applied to an LTE system, in which the antenna port power is obtained by calculating and evaluating the received signal strength of a 1.08M bandwidth signal with a frequency point as a center frequency point by a searching module, and performing conversion. The frequency band searching apparatus 20 may also be applied to TD-SCDMA, in which the antenna port power is obtained by receiving the time domain signal in the 1.28M bandwidth with the evaluation frequency point as the center frequency point by the searching module, performing frame synchronization to obtain the received signal strength of the downlink pilot time slot signal, and performing conversion. The interval between adjacent frequency points of the TD-SCDMA system is 200KHz.
The frequency band searching method of the invention is carried out independently for each frequency band, namely whether switching is needed or not is carried out independently for each frequency band, searching for the next frequency band is carried out after searching for one frequency band is finished, and whether the antenna connection mode needs to be replaced or not is judged again to carry out frequency band searching.
In summary, the time domain signals of each evaluation frequency point of a frequency band are received in the first antenna connection mode, statistics are obtained, whether the power of the antenna port of each evaluation frequency point of the frequency band is smaller than a preset power threshold is judged based on the statistics, and when the power of the antenna port of each evaluation frequency point of the frequency band is smaller than the preset power threshold, the second antenna connection mode is replaced to search the frequency band again, so that the increased time consumption only depends on the time consumption of the statistics and is far shorter than the time of single frequency band search, and thus, the time consumption of frequency band search can be greatly reduced while the robustness is not reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (19)
1. A method for frequency band searching, the method comprising:
receiving time domain signals of evaluation frequency points in a first frequency band in a first antenna connection mode, and obtaining signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band, wherein the evaluation frequency points in the first frequency band are a plurality of evaluation frequency points;
judging whether the signal intensity statistic of the time domain signal of the evaluation frequency point in the first frequency band is smaller than a preset power threshold or not;
when the signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band are all smaller than a preset power threshold, replacing to search the frequency bands in the first frequency band again according to a second antenna connection mode;
the first antenna is connected with the main set channel, the second antenna is connected with the diversity channel, the second antenna is connected with the main set channel, the first antenna is connected with the diversity channel, and the main set channel and the diversity channel are responsible for receiving and sending time domain signals.
2. The method of claim 1, further comprising:
and when the signal intensity statistic of the time domain signal of at least one evaluation frequency point in the first frequency band is not less than the power threshold, continuing to search the frequency band in the first frequency band according to the first antenna connection mode.
3. A method for frequency band searching, the method comprising:
receiving time domain signals of evaluation frequency points in a first frequency band in a first antenna connection mode, and obtaining signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band, wherein the evaluation frequency points in the first frequency band are a plurality of evaluation frequency points;
judging whether the signal intensity statistic of the time domain signal of the evaluation frequency point in the first frequency band is smaller than a preset power threshold or not;
when the signal intensity statistic of the time domain signal of at least one evaluation frequency point in the first frequency band is not less than the power threshold, continuing to search the frequency band in the first frequency band according to the first antenna connection mode;
the first antenna is connected with a main set channel, the second antenna is connected with a diversity channel, and the main set channel and the diversity channel are responsible for receiving and sending time domain signals.
4. The method of claim 3, further comprising:
when the signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band are all smaller than a preset power threshold, replacing to search the frequency bands in the first frequency band again according to a second antenna connection mode;
the second antenna is connected with the main diversity channel, and the first antenna is connected with the diversity channel.
5. The method of any of claims 1-4, wherein the bin search comprises:
receiving time domain signals of each frequency point in a plurality of frequency points in the first frequency band, and obtaining synchronous signals based on the time domain signals of the frequency points; and at least one frequency point in the plurality of frequency points is included between two adjacent evaluation frequency points.
6. The method according to any one of claims 1 to 5, wherein:
the first antenna connection mode is to search the first frequency band through a first antenna, and the second antenna connection mode is to search the first frequency band through a second antenna outside the first antenna.
7. The method according to any one of claims 1-6, wherein:
under the first antenna connection mode, a main set receiving channel is connected with a first antenna, and a diversity receiving channel is connected with a second antenna;
in the second antenna connection mode, the main set receiving channel is connected to the second antenna, and the diversity receiving channel is connected to the first antenna.
8. The method according to any one of claims 1-7, wherein obtaining the signal strength statistics of the time domain signals of an evaluation bin comprises:
and counting the received signal strength in a preset bandwidth with the evaluation frequency point as a central frequency point to obtain the signal strength statistic.
9. A frequency band searching apparatus, comprising:
a processor and a memory; wherein the processor is configured to execute the program instructions in the memory to implement the method of any of claims 1-8.
10. A frequency band searching apparatus, comprising:
an interface for a processor and a data bus; wherein the processor is coupled to the memory through an interface of the data bus and executes program instructions in the memory to implement the method of any one of claims 1-8.
11. A computer-readable storage medium, characterized in that:
the computer readable storage medium has stored therein program instructions executable by a processor of a computer to perform the method of any of claims 1-8.
12. A frequency band searching apparatus, comprising:
the module is used for receiving time domain signals of evaluation frequency points in a first frequency band in a first antenna connection mode and obtaining signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band, wherein the evaluation frequency points in the first frequency band are a plurality of evaluation frequency points;
a module for judging whether the signal intensity statistic of the time domain signal of the evaluation frequency point in the first frequency band is smaller than a preset power threshold;
when the signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band are all smaller than a preset power threshold, replacing the time domain signals with the signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band with a module for searching the frequency bands in the first frequency band again according to a second antenna connection mode;
the first antenna is connected with the main set channel, the second antenna is connected with the diversity channel, the second antenna is connected with the main set channel, the first antenna is connected with the diversity channel, and the main set channel and the diversity channel are responsible for receiving and sending time domain signals.
13. The apparatus of claim 12, further comprising:
and when the signal intensity statistics of the time domain signal of at least one evaluation frequency point in the first frequency band is not less than the power threshold, continuing to search the frequency band in the first frequency band according to the first antenna connection mode.
14. A frequency band searching apparatus, comprising:
the module is used for receiving time domain signals of evaluation frequency points in a first frequency band in a first antenna connection mode and obtaining signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band, wherein the evaluation frequency points in the first frequency band are a plurality of evaluation frequency points;
a module for judging whether the signal strength statistic of the time domain signal of the evaluation frequency point in the first frequency band is smaller than a preset power threshold;
a module configured to continue frequency band search in the first frequency band according to the first antenna connection mode when the signal strength statistic of the time domain signal of at least one evaluation frequency point in the first frequency band is not less than the power threshold;
the first antenna is connected with the main set channel, the second antenna is connected with the diversity channel, and the main set channel and the diversity channel are responsible for receiving and transmitting time domain signals.
15. The apparatus of claim 14, further comprising:
when the signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band are all smaller than a preset power threshold, replacing the time domain signals with the signal intensity statistics of the time domain signals of the evaluation frequency points in the first frequency band with a module for searching the frequency bands in the first frequency band again according to a second antenna connection mode;
the second antenna is connected with the main diversity channel, and the first antenna is connected with the diversity channel.
16. The apparatus according to any one of claims 12-15, further comprising:
a module for receiving the time domain signal of each of the plurality of frequency points in the frequency band and obtaining a synchronization signal based on the time domain signals of the plurality of frequency points; and at least one frequency point in the plurality of frequency points is included between two adjacent evaluation frequency points.
17. The apparatus according to any one of claims 12-16, wherein:
the first antenna connection mode is to search the first frequency band through a first antenna, and the second antenna connection mode is to search the first frequency band through a second antenna outside the first antenna.
18. The apparatus according to any one of claims 12-17, wherein:
under the first antenna connection mode, a main set receiving channel is connected with a first antenna, and a diversity receiving channel is connected with a second antenna;
in the second antenna connection mode, the main set receiving channel is connected to the second antenna, and the diversity receiving channel is connected to the first antenna.
19. The apparatus according to any one of claims 12-18, wherein:
the module for receiving the time domain signal of the evaluation frequency point in the first frequency band in the first antenna connection mode and obtaining the signal strength statistics of the time domain signal of the evaluation frequency point in the first frequency band is used for:
and counting the received signal strength in a preset bandwidth with the evaluation frequency point as a central frequency point to obtain the signal strength statistic.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202561A (en) * | 2007-12-18 | 2008-06-18 | 中兴通讯股份有限公司 | System and method for searching signal |
| CN103533605A (en) * | 2012-07-04 | 2014-01-22 | 中国移动通信集团公司 | Frequency sweeping method and device of user terminal |
| CN103533607A (en) * | 2013-09-18 | 2014-01-22 | 华为技术有限公司 | Frequency band searching method and device |
| CN103841597A (en) * | 2012-11-27 | 2014-06-04 | 联芯科技有限公司 | Frequency point scanning method and device for TD-SCDMA system |
| WO2015008165A2 (en) * | 2013-06-25 | 2015-01-22 | Nguyen Thuy Duong | Detection of weak user signal in double transmission |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158933B (en) * | 2010-02-11 | 2014-01-22 | 富士通株式会社 | Method and device for frequency band searching in TDD-LTE (Time Division Duplex-Long Term Evolution) system |
| CN102752831B (en) * | 2012-06-25 | 2014-01-08 | 华为技术有限公司 | Frequency band searching method and device |
| US20150119037A1 (en) * | 2013-10-31 | 2015-04-30 | Qualcomm Incorporated | Cell reselection with multiple search lists |
-
2015
- 2015-06-26 CN CN201510362698.6A patent/CN105101353B/en active Active
- 2015-06-26 CN CN201811321200.1A patent/CN109348524B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202561A (en) * | 2007-12-18 | 2008-06-18 | 中兴通讯股份有限公司 | System and method for searching signal |
| CN103533605A (en) * | 2012-07-04 | 2014-01-22 | 中国移动通信集团公司 | Frequency sweeping method and device of user terminal |
| CN103841597A (en) * | 2012-11-27 | 2014-06-04 | 联芯科技有限公司 | Frequency point scanning method and device for TD-SCDMA system |
| WO2015008165A2 (en) * | 2013-06-25 | 2015-01-22 | Nguyen Thuy Duong | Detection of weak user signal in double transmission |
| CN103533607A (en) * | 2013-09-18 | 2014-01-22 | 华为技术有限公司 | Frequency band searching method and device |
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| CN105101353A (en) | 2015-11-25 |
| CN105101353B (en) | 2018-11-30 |
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