CN101820298A - Communication method utilizing frequency offset, device, base station and base station control device - Google Patents
Communication method utilizing frequency offset, device, base station and base station control device Download PDFInfo
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Abstract
The embodiment of the invention discloses a communication method utilizing frequency offset, a device, a base station and a base station control device, wherein the method mainly comprises the steps of carrying out demodulation on an uplink signal sent by a terminal, and acquiring the first frequency deviation between the carrier frequency of the uplink signal and the reference frequency of the network side; and judging whether the first frequency deviation meets the preset out-of-step condition or not, and determining that the terminal is in frequency out-of-step situation when the first frequency deviation meets the preset out-of-step condition. The technical scheme of the embodiment of the invention can detect the frequency out-of-step phenomenon of the terminal, make up for the blank that the prior art does not have the mechanism for detecting the frequency out-of-step situation of the terminal and further analyze the reasons of reducing the voice quality or leading the terminal to cause call drop.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a communications technology using frequency offset.
Background
With the development of the wireless communication market, the requirements on the capacity and performance of the network are higher and higher. For example, in Global System for Mobile Communications (GSM), network capacity can be increased by increasing frequency multiplexing or by using Orthogonal sub-channels (VAMOS).
In VAMOS technology, multiple handsets are assigned to the same radio channel at the same time, distinguished by different training sequences. Based on the technology, the original channel can be divided into a plurality of sub-channels, so that the resource which can only be originally allocated to one user can be simultaneously allocated to a plurality of users for use. Whether the frequency reuse improvement technology or the VAMOS technology is adopted, the method can be implemented on the basis of the improvement of the receiving performance of the network and the terminal. The mobile phone with good receiving performance can still correctly provide better service quality under the condition of very low carrier-to-interference ratio, and the network can carry out tighter frequency planning and improve the utilization rate of frequency spectrum. On the condition that the frequency plan is not changed, the VAMOS technology multiplexes two users on one channel, and the utilization rate of the channel is improved by two times.
In practical tests, many terminals are found to be prone to dropped calls or degraded voice quality when VAMOS multiplexing is performed. However, the reason for the dropped call or voice quality degradation of the terminal is not clear in the prior art.
Disclosure of Invention
The embodiment of the invention provides a communication method utilizing frequency deviation, so that whether the frequency of a terminal is out of step or not can be detected.
In one aspect, a communication method using frequency offset is provided, which mainly includes:
demodulating an uplink signal sent by a terminal to acquire a first frequency deviation between a carrier frequency of the uplink signal and a network side reference frequency;
and judging whether the first frequency deviation meets a preset out-of-step condition, and if the first frequency deviation meets the preset out-of-step condition, confirming that the terminal has frequency out-of-step.
In another aspect, a communication apparatus using frequency offset is provided, which mainly includes:
the frequency deviation acquisition module is used for demodulating an uplink signal sent by a terminal and acquiring a first frequency deviation between the carrier frequency of the uplink signal and a network side reference frequency;
and the confirming module is used for judging whether the first frequency deviation acquired by the frequency deviation acquiring module meets a preset out-of-step condition or not, and confirming that the frequency of the terminal is out-of-step if the first frequency deviation meets the preset out-of-step condition.
In still another aspect, a base station is also provided, which includes the above communication apparatus utilizing frequency offset.
In still another aspect, a base station control device is further provided, which includes the above communication apparatus using frequency offset.
The technical scheme provided by the embodiment of the invention can detect the phenomenon of the desynchronization of the terminal frequency and make up for the blank that no mechanism for detecting the desynchronization of the terminal frequency exists in the prior art, thereby analyzing the reason for reducing the voice quality or dropping the call of the terminal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a flow chart of a communication method using frequency offset according to an embodiment of the present invention;
fig. 2 is a flow chart of a communication method using frequency offset according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a communication apparatus using frequency offset according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication apparatus using frequency offset according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Under the existing network architecture, a terminal may drop a call due to a too high carrier-to-interference ratio or a too low carrier-to-interference ratio, and the inventor of the present invention finds through a lot of tests and analyses that: the reason why the terminal has a call drop is mainly caused by the fact that the reference frequency of the terminal is greatly deviated from the reference frequency of the network side. As the deviation between the reference frequency of the terminal and the reference frequency of the network side is large, the terminal fails to receive the downlink signal or the base station fails to receive the uplink signal of the terminal, thereby causing a call drop. The phenomenon that the reference frequency of the terminal is greatly deviated from the reference frequency of the network side can be called frequency desynchronization. The existing method for adjusting the receiving performance of the network and the terminal is to adjust the transmitting power of the network side or the terminal by detecting the receiving quality and the receiving level. This approach does not address dropped calls due to out-of-sync terminal frequencies. In the prior art, a mechanism for detecting the desynchronization of the terminal frequency is not provided, and a mechanism for calibrating the reference frequency of the mobile phone according to the desynchronization detection of the terminal frequency is not provided.
An embodiment of the present invention provides a communication method using frequency offset, as shown in fig. 1, the method may include:
s101, demodulating an uplink signal sent by a terminal to obtain a first frequency deviation between a carrier frequency of the uplink signal and a reference frequency of a network side;
after receiving the uplink signal sent by the terminal, the network side performs demodulation, and the specific demodulation mode is basically the same as the mode in the prior art, and is not described here again. When demodulating the uplink signal, the network side may obtain, through a frequency offset estimation algorithm, a first frequency offset between a carrier frequency of the uplink signal of the terminal and a reference frequency of the network side.
And S102, judging whether the first frequency deviation meets a preset out-of-step condition, and if the first frequency deviation meets the preset out-of-step condition, confirming that the terminal has frequency out-of-step.
In the prior art, because the phenomenon that the terminal is out of step in frequency is not considered, after the frequency offset is estimated, only the received signal is subjected to deviation rectification processing, and whether the terminal is out of step in frequency is not detected according to the first frequency deviation. In this embodiment, after the first frequency deviation between the carrier frequency of the uplink signal of the terminal and the reference frequency of the network side is estimated in S101, whether frequency step-out occurs in the terminal may be further determined according to the first frequency deviation.
The preset out-of-step condition here may include: the absolute value of the first frequency deviation is greater than or equal to a preset threshold value; and/or the variation characteristic of the first frequency deviation meets a preset variation characteristic; and/or if the base station is located in the area range where the terminal does not move at a high speed, the first frequency deviation exceeds an allowable error range, and if the base station is located in the area range where the terminal moves at a high speed, the absolute value of the first frequency deviation is greater than or equal to a preset threshold value.
There may be various ways to determine whether the first frequency deviation satisfies the predetermined out-of-step condition, for example:
A. comparing the absolute value of the first frequency deviation with a preset threshold, if the absolute value of the first frequency deviation is greater than or equal to the preset threshold, the terminal may be considered to meet a preset out-of-step condition, and the preset threshold may be set empirically, and in general, if the first frequency deviation caused by the movement of the terminal is not too high, for example, below 400Hz, 400Hz may be used as the preset threshold, and of course, the preset threshold may be different values according to different terminal types or different network systems or different accuracy requirements, which is not to be taken as an example here. In addition, in order to make the detection result more stable, the absolute values of the acquired plurality of first frequency deviations may be averaged or filtered within a first preset period, and the result of the averaging or filtering may be compared with a preset threshold.
B. And comparing the change characteristic of the first frequency deviation with the pre-stored change characteristic information, and judging whether the first frequency deviation meets a preset out-of-step condition according to the comparison result.
The prestored change characteristic information may be information indicating a change characteristic of frequency offset caused by terminal movement, or information indicating a change characteristic of frequency offset caused by terminal frequency step-out. The pre-stored change characteristic information can be obtained through a test analysis in advance and is stored on the network side as reference information.
The method can be specifically realized by the following steps: in the second preset period, the change characteristic of the first frequency deviation is recorded, the recording mode may be directly recording the first frequency deviation result obtained by each frequency offset estimation, or may be recording a difference between the first frequency deviation between the carrier frequency of the uplink signal of the terminal and the reference frequency of the network side and the first frequency deviation between the carrier frequency of the uplink signal of the terminal and the reference frequency of the network side last time. The recorded variation characteristic of the first frequency deviation may be compared with the variation characteristic information stored in advance, for example, the recorded variation characteristic of the first frequency deviation may be correlated with the variation characteristic information stored in advance to obtain a correlation coefficient, and whether the first frequency deviation satisfies a predetermined step-out condition is determined according to the correlation coefficient. If the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal frequency desynchronization, whether the correlation coefficient is greater than or equal to a preset first correlation threshold can be detected, if so, the first frequency deviation can be considered to meet a preset desynchronization condition (namely, the preset change characteristic is met), otherwise, the first frequency deviation can be considered to not meet the preset desynchronization condition; if the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal movement, whether the correlation coefficient is smaller than or equal to a preset second correlation threshold can be detected, if so, the first frequency deviation can be considered to meet a preset out-of-step condition (namely, the preset change characteristic is met), otherwise, the first frequency deviation can be considered to not meet the preset out-of-step condition. Wherein the first correlation threshold and the second correlation threshold are any value between 0 and 1, and can be set in practical situations. The second preset period and the first preset period may be equal to or different from each other, and the first preset period and the second preset period may be set according to actual needs.
C. Whether the first frequency deviation meets a preset out-of-step condition or not can be judged by combining the position information of the base station. If it is known from the location information of the base station that the base station is not deployed in the area where the terminal moves at high speed (i.e., the terminal non-high-speed movement area), such as an expressway or an expressway, and the first frequency deviation is not within an allowable error range (e.g., [ -10Hz, 10Hz ]), it may be considered that the first frequency deviation satisfies a preset out-of-step condition. And if the base station is positioned in the area range where the terminal moves at a high speed, judging whether the absolute value of the first frequency deviation is greater than a preset threshold value, and if so, judging that the first frequency deviation meets a preset out-of-step condition. The preset threshold value here and the preset threshold value in the mode a may be the same value.
It should be noted that, since the frequency offset estimation may have a certain error, an allowable error range may be set here, and the allowable error range may be an open interval, a closed interval, or the like.
It should be noted that the above manners for determining whether the first frequency deviation satisfies the predetermined out-of-step condition may be used alone or in combination. For example, after the first frequency deviation is judged to satisfy the preset step-out condition according to the mode a, the correlation between the change characteristic of the first frequency deviation and the change characteristic information stored in advance in the second preset period time after the judgment according to the mode B is further judged, and if the preset step-out condition is still satisfied, the first frequency deviation is considered to satisfy the preset step-out condition, so that the judgment on whether the terminal has the frequency step-out is more stable.
By the method in the embodiment, the phenomenon of the desynchronization of the terminal frequency can be detected, and the blank that no mechanism for detecting the desynchronization of the terminal frequency exists in the prior art is made up, so that the reason for reducing the voice quality or dropping the call of the terminal can be analyzed.
It should be noted that the above method may be performed by a base station or a base station control device.
Further, after it is determined that the terminal has a frequency out-of-step phenomenon, the reference frequency of the terminal may be adjusted, so that the reference frequency of the terminal may be synchronized with the reference frequency of the network side, another embodiment of the present invention provides a communication method using frequency offset, as shown in fig. 2, the method may include:
s201, demodulating an uplink signal sent by a terminal, and acquiring a first frequency deviation between a carrier frequency of the uplink signal of the terminal and a reference frequency of a network side;
s202, judging whether the first frequency deviation meets a preset out-of-step condition or not, and if the first frequency deviation meets the preset out-of-step condition, confirming that the terminal has frequency out-of-step;
the processing manner of S201-S202 may refer to the related description of S101-S102, and is not described herein again. When the terminal out-of-step frequency is detected in S202, S203 is executed.
And S203, adjusting the carrier-to-interference ratio of the downlink signal.
The adjustment of the carrier-to-interference ratio may be controlled by the base station control device or the base station.
The frequency loss may be caused by too low carrier-to-interference ratio or too high carrier-to-interference ratio, so adjusting the carrier-to-interference ratio of the downlink signal may be to increase the carrier-to-interference ratio or to decrease the carrier-to-interference ratio. When determining whether to increase or decrease the carrier-to-interference ratio, an attempt may be made, for example, to gradually increase the carrier-to-interference ratio, monitor whether the frequency step-out phenomenon of the terminal has disappeared within a period of time or determine whether the frequency step-out phenomenon of the terminal has disappeared when the carrier-to-interference ratio has increased to a certain value (for example, 0dB), and if the frequency step-out phenomenon of the terminal has not disappeared within a period of time or when the carrier-to-interference ratio has increased to a certain value, which may mean that the direction of adjusting the carrier-to-interference ratio is wrong, adjust the carrier-to-interference ratio in the opposite direction. It should be noted that, in most cases, the carrier-to-interference ratio may be too low to cause frequency step-out, so that an attempt to increase the carrier-to-interference ratio may be made when attempting to adjust the carrier-to-interference ratio.
The method for improving the carrier-to-interference ratio of the downlink signal may be:
increasing the power of the signal sent to the terminal; or reducing the power of a signal that causes interference to the terminal; or the terminal is switched to another channel with better carrier-to-interference ratio (i.e. the channel with the carrier-to-interference ratio higher than that of the channel in which the terminal is currently located). The above methods can be used alone or in combination. The signal interfering with the terminal may be a signal of another terminal in the own cell or a signal of a terminal in an adjacent cell. In addition, in the situation of the VAMOS technology, the signal that the terminal generates interference is mainly other terminals that multiplex the same channel; while the other channel with better carrier-to-interference ratio is generally other independent non-multiplexed channel
The method for reducing the carrier-to-interference ratio of the downlink signal may be:
reducing the power of a signal sent to the terminal; or increasing the power of a signal that causes interference to the terminal; or the terminal is switched to another channel with lower carrier-to-interference ratio (i.e. a channel with a carrier-to-interference ratio lower than that of the channel in which the terminal is currently located). In addition, for the VAMOS technology scenario, the signal that the terminal generates interference is mainly the other terminal that multiplexes the same channel.
S204, acquiring a second frequency deviation between the carrier frequency of the uplink signal of the terminal and the reference frequency of the network side, and determining whether the frequency desynchronization of the terminal is eliminated or not according to the second frequency deviation and a preset synchronization condition.
The network side can continuously monitor a second frequency deviation between the carrier frequency of the uplink signal of the terminal and the reference frequency of the network side after the carrier-to-interference ratio is adjusted, judge whether the frequency desynchronization of the terminal is eliminated or not according to the second frequency deviation and a preset synchronization condition, and confirm that the frequency desynchronization of the terminal is eliminated if the second frequency deviation meets the preset synchronization condition.
Wherein, the preset synchronization condition may include:
the absolute value of the second frequency deviation is smaller than a preset threshold (it should be noted that, in the case that the absolute value of the second frequency deviation is equal to the preset threshold, the synchronization condition may also be considered to be satisfied); and/or the presence of a gas in the gas,
when the pre-stored variation characteristic information is information representing frequency offset variation characteristics caused by terminal frequency desynchronization, a correlation coefficient between the variation characteristic of the second frequency deviation and the pre-stored variation characteristic information is smaller than a preset first correlation threshold (it should be noted that, in the case that the second frequency deviation is equal to the first correlation threshold, the synchronization condition may also be considered to be satisfied); when the pre-stored variation characteristic information is information representing a variation characteristic of frequency offset caused by movement of the terminal, a correlation coefficient between the variation characteristic of the second frequency deviation and the pre-stored variation characteristic information is greater than a preset second correlation threshold (it should be noted that, in the case where the second frequency deviation is equal to the second correlation threshold, it may also be considered that a synchronization condition is satisfied); and/or the presence of a gas in the gas,
if the base station is located in the area range where the terminal does not move at a high speed, the second frequency deviation is within the allowable error range; if the base station is located in the area where the terminal moves at a high speed, the absolute value of the second frequency deviation is smaller than the preset threshold (it should be noted that, in the case where the absolute value of the second frequency deviation is equal to the preset threshold, the synchronization condition may also be considered to be satisfied).
If the frequency step-out of the terminal is not eliminated, the carrier-to-interference ratio can be further continuously adjusted and whether the frequency step-out is eliminated or not can be judged until the frequency step-out of the terminal is eliminated.
In the method of the embodiment, after the frequency of the terminal is determined to be out of step, the reference frequency of the terminal is adjusted by adjusting the carrier-to-interference ratio of the downlink signal, so that the voice quality can be prevented from being reduced or the terminal is prevented from being dropped as much as possible.
An embodiment of the present invention further provides a communication apparatus using frequency offset, as shown in fig. 3, the apparatus may include:
a frequency offset obtaining module 301, configured to demodulate an uplink signal sent by a terminal, and obtain a first frequency offset between a carrier frequency of the uplink signal and a network-side reference frequency;
after receiving the uplink signal sent by the terminal, the network side performs demodulation, and the specific demodulation mode is basically the same as the mode in the prior art, and is not described here again. When demodulating the uplink signal, the network side may obtain, through a frequency offset estimation algorithm, a first frequency offset between a carrier frequency of the uplink signal of the terminal and a reference frequency of the network side.
A determining module 302, configured to determine whether the first frequency deviation obtained by the frequency deviation obtaining module 301 meets a preset out-of-step condition, and if the first frequency deviation meets the preset out-of-step condition, determine that the terminal has frequency out-of-step.
The preset out-of-step condition here may include: the absolute value of the first frequency deviation is larger than a preset threshold value; and/or the variation characteristic of the first frequency deviation meets a preset variation characteristic; and/or if the base station is located in the area range where the terminal does not move at a high speed, the first frequency deviation exceeds an allowable error range, and if the base station is located in the area range where the terminal moves at a high speed, the absolute value of the first frequency deviation is greater than a preset threshold value.
The manner of determining whether the acquired first frequency deviation satisfies the predetermined out-of-step condition may refer to the related description in the foregoing method embodiment, and is not described herein again.
The device in the embodiment judges whether the phenomenon of terminal frequency desynchronization occurs or not by detecting the relation between the frequency deviation and the preset desynchronization condition, and makes up for the blank that the mechanism for detecting the terminal frequency desynchronization does not exist in the prior art, so that the reason for reducing the voice quality or dropping the call of the terminal can be analyzed.
Further, after it is determined that the terminal has a frequency out-of-step phenomenon, the reference frequency of the terminal may be adjusted, so that the reference frequency of the terminal may be synchronized with the reference frequency of the network side, another embodiment of the present invention provides a communication apparatus using frequency offset, and as shown in fig. 4, the apparatus may include:
a frequency offset obtaining module 401, configured to demodulate an uplink signal sent by a terminal, and obtain a first frequency offset between a carrier frequency of the uplink signal and a network-side reference frequency;
a determining module 402, configured to determine whether the first frequency deviation obtained by the frequency deviation obtaining module 401 meets a preset out-of-step condition, and if the first frequency deviation meets the preset out-of-step condition, determine that the terminal has frequency out-of-step;
the processing manner and the functional structure of the frequency offset obtaining module 401 and the confirming module 402 are basically the same as those of the frequency offset obtaining module 301 and the confirming module 302 in the embodiment shown in fig. 3, and are not described herein again.
An adjusting module 403, configured to adjust a carrier-to-interference ratio of a downlink signal after the determining module 402 determines that the frequency of the terminal is out of step;
wherein, adjusting the carrier-to-interference ratio of the downlink signal may include: and increasing or decreasing the carrier-to-interference ratio of the downlink signal.
There are various ways to increase the carrier-to-interference ratio of the downlink signal: improving the power of a downlink signal sent to a terminal; or reducing the power of a downlink signal which generates interference to the terminal; or switching the terminal to a channel with a carrier-to-interference ratio higher than that of the channel in which the terminal is currently located;
there are also various ways to reduce the carrier-to-interference ratio of the downlink signal: reducing the power of a downlink signal sent to a terminal; or the power of a downlink signal which generates interference to the terminal is increased; or switching the terminal to a channel with carrier-to-interference ratio lower than that of the channel in which the terminal is currently positioned. Reference may be specifically made to the related description in the embodiment shown in fig. 2, and details are not repeated here.
The network side may continue to monitor the first frequency deviation between the carrier frequency of the uplink signal of the terminal and the reference frequency of the network side after adjusting the carrier-to-interference ratio, and then the communication device using the frequency offset in this embodiment may further include: a decision block 404;
a frequency deviation obtaining module 401, configured to obtain a second frequency deviation between the carrier frequency of the currently received uplink signal and the network-side reference frequency after the carrier-to-interference ratio of the downlink signal is adjusted by the adjusting module 403;
a determining module 404, configured to determine whether the frequency out-of-step of the terminal is eliminated according to the second frequency deviation and a preset synchronization condition, and if the second frequency deviation meets the preset synchronization condition, determine that the frequency out-of-step of the terminal is eliminated.
If the second frequency deviation does not satisfy the preset synchronization condition, the carrier-to-interference ratio of the downlink signal may be continuously adjusted by the adjusting module 403. The preset synchronization conditions may include:
the absolute value of the second frequency deviation is less than or equal to a preset threshold value; and/or the presence of a gas in the gas,
when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal frequency desynchronization, the correlation coefficient of the change characteristics of the second frequency deviation and the pre-stored change characteristic information is smaller than a preset first correlation threshold; when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal movement, the correlation coefficient of the change characteristics of the second frequency offset and the pre-stored change characteristic information is greater than a preset second correlation threshold; and/or the presence of a gas in the gas,
if the base station is located in the area range where the terminal does not move at a high speed, the second frequency deviation is within the allowable error range; if the base station is located in the area where the terminal moves at a high speed, the absolute value of the second frequency deviation is less than or equal to a preset threshold.
It should be noted that, for the processing, the interaction process, and the specific structural function of each module, reference may be made to the relevant description in the method embodiment, and details are not described here again.
The device of the embodiment adjusts the reference frequency of the terminal by adjusting the carrier-to-interference ratio of the downlink signal after confirming that the frequency of the terminal is out of step, thereby avoiding the voice quality reduction or avoiding the call drop of the terminal as much as possible.
An embodiment of the present invention further provides a base station, which includes the communication apparatus utilizing frequency offset according to the embodiment shown in fig. 3 or fig. 4.
Another embodiment of the present invention further provides a base station control apparatus, which includes the communication apparatus utilizing frequency offset according to the embodiment shown in fig. 3 or fig. 4.
The technical solution of the present embodiment can be applied to various communication systems, for example: GSM, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA), time Division Synchronous Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), and the like. Any system may be used as long as it is possible to cause the frequency of the terminal to be out of step. In the GSM system, a terminal is a Mobile Station (MS), a Base Station is a Base Transceiver Station (BTS), and a Base Station control device is a Base Station Controller (BSC); in WCDMA and TD-SCDMA systems, a terminal is a User Equipment (UE), a base station is a NodeB, and a base station control device is a Radio Network Controller (RNC); in the LTE system, a terminal is a UE, a base station is an evolved node b (eNodeB), and a base station control device is a Serving Gateway (SGW) and a Mobile Management Entity (MME).
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware that is instructed to implement by a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (16)
1. A method of communication utilizing frequency offset, the method comprising:
demodulating an uplink signal sent by a terminal to acquire a first frequency deviation between a carrier frequency of the uplink signal and a network side reference frequency;
and judging whether the first frequency deviation meets a preset out-of-step condition, and if the first frequency deviation meets the preset out-of-step condition, confirming that the terminal has frequency out-of-step.
2. The method of claim 1, wherein the predetermined out-of-sync condition is that an absolute value of the first frequency deviation is greater than a predetermined threshold;
the judging whether the first frequency deviation meets a preset out-of-step condition comprises:
comparing the absolute value of the first frequency deviation with the preset threshold value, and judging whether the first frequency deviation meets a preset out-of-step condition or not according to the comparison result;
and if the absolute value of the first frequency deviation is greater than or equal to the preset threshold, judging that the terminal meets the preset out-of-step condition.
3. The method of claim 1, wherein the predetermined out-of-step condition is that a variation characteristic of the first frequency deviation satisfies a predetermined variation characteristic;
the judging whether the first frequency deviation meets a preset out-of-step condition comprises:
and comparing the change characteristic of the first frequency deviation with the pre-stored change characteristic information, and judging whether the first frequency deviation meets a preset out-of-step condition according to a comparison result.
4. The method of claim 3,
the comparing the variation characteristic of the first frequency deviation with variation characteristic information stored in advance includes: acquiring a correlation coefficient between the change characteristic of the first frequency deviation and pre-stored change characteristic information;
when the prestored change characteristic information is information representing frequency offset change characteristics caused by terminal frequency desynchronization, the judging whether the first frequency deviation meets a preset desynchronization condition according to the comparison result comprises: when the correlation coefficient is greater than or equal to a preset first relative closing time, judging that the terminal meets the preset out-of-step condition;
when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal frequency movement, the determining whether the first frequency deviation meets a preset out-of-step condition according to the comparison result includes: and when the correlation coefficient is less than or equal to a preset second closing threshold, judging that the terminal meets the preset out-of-step condition.
5. The method of claim 1, wherein if the base station is located in a region where the terminal is not moving at a high speed, the predetermined out-of-step condition is that the first frequency deviation exceeds an allowable error range;
the determining whether the first frequency deviation meets a preset out-of-step condition includes:
judging whether the base station is located in a non-high-speed moving area range of the terminal according to the position information of the base station, if so, judging whether the first frequency deviation exceeds the allowable error range, and if so, judging that the first frequency deviation meets a preset out-of-step condition;
or,
if the base station is located in the area range where the terminal moves at a high speed, the preset out-of-step condition is that the absolute value of the first frequency deviation is greater than or equal to a preset threshold value;
the determining whether the first frequency deviation meets a preset out-of-step condition includes:
judging whether the base station is located in the area range where the terminal moves at a high speed according to the position information of the base station, if so, judging whether the absolute value of the first frequency deviation is greater than a preset threshold value, and if so, judging that the first frequency deviation meets a preset out-of-step condition.
6. The method of any one of claims 1-5, further comprising:
and when the frequency of the terminal is determined to be out of step, adjusting the carrier-to-interference ratio of the downlink signal.
7. The method of claim 6, wherein said adjusting the carrier-to-interference ratio of the downstream signal comprises:
increasing or decreasing the carrier-to-interference ratio of the downlink signal;
wherein the increasing the carrier-to-interference ratio of the downlink signal comprises: improving the power of a downlink signal sent to the terminal; or reducing the power of a downlink signal which generates interference to the terminal; or switching the terminal to a channel with a carrier-to-interference ratio higher than that of the channel in which the terminal is currently located;
the reducing the carrier-to-interference ratio of the downlink signal comprises: reducing the power of a downlink signal sent to the terminal; or increasing the power of a downlink signal which generates interference to the terminal; or switching the terminal to a channel with carrier-to-interference ratio lower than that of the channel where the terminal is currently located.
8. The method of claim 6, wherein the adjusting the carrier-to-interference ratio of the downlink signal further comprises:
acquiring a second frequency deviation between the carrier frequency of the currently received uplink signal and the network side reference frequency;
and determining whether the frequency step-out of the terminal is eliminated or not according to the second frequency deviation and a preset synchronization condition, and if the second frequency deviation meets the preset synchronization condition, determining that the frequency step-out of the terminal is eliminated.
9. The method of claim 8,
the preset synchronization conditions are as follows:
the absolute value of the second frequency deviation is smaller than a preset threshold value;
and/or the presence of a gas in the gas,
when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal frequency desynchronization, the correlation coefficient of the change characteristics of the second frequency deviation and the pre-stored change characteristic information is smaller than a preset first correlation threshold; when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal movement, a correlation coefficient of the change characteristics of the second frequency deviation and the pre-stored change characteristic information is greater than a preset second correlation threshold;
and/or the presence of a gas in the gas,
if the base station is located in the area range where the terminal does not move at a high speed, the second frequency deviation is within an allowable error range; and if the base station is positioned in the area range where the terminal moves at a high speed, the absolute value of the second frequency deviation is smaller than a preset threshold value.
10. An apparatus for communication utilizing frequency offset, the apparatus comprising:
the frequency deviation acquisition module is used for demodulating an uplink signal sent by a terminal and acquiring a first frequency deviation between the carrier frequency of the uplink signal and a network side reference frequency;
and the confirming module is used for judging whether the first frequency deviation acquired by the frequency deviation acquiring module meets a preset out-of-step condition or not, and confirming that the frequency of the terminal is out-of-step if the first frequency deviation meets the preset out-of-step condition.
11. The apparatus of claim 10, wherein the predetermined out-of-sync condition comprises:
the absolute value of the first frequency deviation is greater than or equal to a preset threshold value; and/or the presence of a gas in the gas,
when the prestored change characteristic information is information representing frequency offset change characteristics caused by terminal frequency desynchronization, the correlation coefficient of the change characteristics of the first frequency deviation and the prestored change characteristic information is greater than or equal to a preset first correlation threshold; when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal movement, a correlation coefficient of the change characteristics of the first frequency deviation and the pre-stored change characteristic information is smaller than or equal to a preset second correlation threshold; and/or the presence of a gas in the gas,
if the base station is located in the area range where the terminal does not move at a high speed, the first frequency deviation exceeds an allowable error range, and if the base station is located in the area range where the terminal moves at a high speed, the absolute value of the first frequency deviation is greater than or equal to a preset threshold value.
12. The apparatus of claim 10 or 11, wherein the apparatus further comprises: a judgment module;
the frequency deviation obtaining module obtains a second frequency deviation between the carrier frequency of the currently received uplink signal and the network side reference frequency after the adjusting module adjusts the carrier-to-interference ratio of the downlink signal;
and the judging module is used for confirming whether the frequency out-of-step of the terminal is eliminated or not according to the second frequency deviation and a preset synchronization condition, and confirming that the frequency out-of-step of the terminal is eliminated if the second frequency deviation meets the preset synchronization condition.
13. The apparatus of claim 12, wherein the preset synchronization condition comprises:
the absolute value of the second frequency deviation is smaller than a preset threshold value; and/or the presence of a gas in the gas,
when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal frequency desynchronization, the correlation coefficient of the change characteristics of the second frequency deviation and the pre-stored change characteristic information is smaller than a preset first correlation threshold; when the pre-stored change characteristic information is information representing frequency offset change characteristics caused by terminal movement, a correlation coefficient of the change characteristics of the second frequency deviation and the pre-stored change characteristic information is greater than a preset second correlation threshold; and/or the presence of a gas in the gas,
if the base station is located in the area range where the terminal does not move at a high speed, the second frequency deviation is within an allowable error range; and if the base station is positioned in the area range where the terminal moves at a high speed, the absolute value of the second frequency deviation is smaller than a preset threshold value.
14. The apparatus of claim 12, wherein when the determining module determines that the second frequency deviation does not satisfy the predetermined synchronization condition, the adjusting module continues to adjust the carrier-to-interference ratio of the downlink signal.
15. A base station, characterized in that it comprises the communication means using frequency offset according to any of claims 10-14.
16. A base station control apparatus, characterized by comprising the communication means using frequency offset according to any one of claims 10 to 14.
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| CN201010042731.4A CN101820298B (en) | 2010-01-11 | 2010-01-11 | Communication method utilizing frequency offset, device, base station and base station control device |
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| CN201010042731.4A CN101820298B (en) | 2010-01-11 | 2010-01-11 | Communication method utilizing frequency offset, device, base station and base station control device |
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| CN101820298B CN101820298B (en) | 2014-04-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685875A (en) * | 2012-05-03 | 2012-09-19 | 京信通信系统（中国）有限公司 | Method and device for timing synchronization adjustment between base stations |
| CN106612168A (en) * | 2016-12-23 | 2017-05-03 | 中国电子科技集团公司第三十研究所 | Voice out-of-synchronism detection method based on PCM coding characteristics |
| CN110972338A (en) * | 2018-09-28 | 2020-04-07 | 北京松果电子有限公司 | Method for determining Cyclic Redundancy Check (CRC) error of user equipment, base station and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6104767A (en) * | 1997-11-17 | 2000-08-15 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for estimating a frequency offset |
| US7209716B2 (en) * | 2003-02-27 | 2007-04-24 | Ntt Docomo, Inc. | Radio communication system, radio station, and radio communication method |
| CN2757450Y (en) * | 2004-11-15 | 2006-02-08 | 凯明信息科技股份有限公司 | Coarse frequency corrector |
| CN2757451Y (en) * | 2004-11-19 | 2006-02-08 | 凯明信息科技股份有限公司 | Fine frequency corrector |
| US7885237B2 (en) * | 2007-08-01 | 2011-02-08 | Broadcom Corporation | Cell search operations using multibranch PSYNC detection module |
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2010
- 2010-01-11 CN CN201010042731.4A patent/CN101820298B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685875A (en) * | 2012-05-03 | 2012-09-19 | 京信通信系统（中国）有限公司 | Method and device for timing synchronization adjustment between base stations |
| CN102685875B (en) * | 2012-05-03 | 2015-07-15 | 京信通信系统（中国）有限公司 | Method and device for timing synchronization adjustment between base stations |
| CN106612168A (en) * | 2016-12-23 | 2017-05-03 | 中国电子科技集团公司第三十研究所 | Voice out-of-synchronism detection method based on PCM coding characteristics |
| CN106612168B (en) * | 2016-12-23 | 2019-07-16 | 中国电子科技集团公司第三十研究所 | A kind of voice step failing out detecting method based on pcm encoder feature |
| CN110972338A (en) * | 2018-09-28 | 2020-04-07 | 北京松果电子有限公司 | Method for determining Cyclic Redundancy Check (CRC) error of user equipment, base station and storage medium |
| CN110972338B (en) * | 2018-09-28 | 2021-09-21 | 北京小米松果电子有限公司 | Method for determining Cyclic Redundancy Check (CRC) error of user equipment, base station and storage medium |
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| CN101820298B (en) | 2014-04-30 |
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