CN108462977B - Automatic gain control method and device - Google Patents
Automatic gain control method and device Download PDFInfo
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- CN108462977B CN108462977B CN201710092177.2A CN201710092177A CN108462977B CN 108462977 B CN108462977 B CN 108462977B CN 201710092177 A CN201710092177 A CN 201710092177A CN 108462977 B CN108462977 B CN 108462977B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
- H04W28/0221—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices power availability or consumption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
Abstract
The embodiment of the invention discloses an automatic gain control method, which comprises the following steps: receiving a first downlink signal from a base station at a first time; determining a corresponding reference subframe in the first downlink signal based on the current working state of the user equipment, and calculating a power value of the reference subframe; receiving a second downlink signal from the base station at a second time after the first time; and performing automatic gain control on the second downlink signal based on the power value of the reference subframe. The embodiment of the invention also discloses an automatic gain control device.
Description
Technical Field
The invention relates to the field of communication of the Internet of things, in particular to an automatic gain control method and device.
Background
A Narrow-Band Internet of things (NB-IoT) technology based on honeycomb is an emerging technology in the field of Internet of things, adopts a time division system, and has the characteristic of unstable signal amplitude variation.
In the NB-IoT communication process, when an Automatic Gain Control (AGC) technology is used to process a Radio Frequency (RF) input signal received by an internet of things chip, a reference signal power needs to be selected as a reference, but since NB-IoT is a time division system, the change of the signal amplitude is unstable in a period of time, and thus the problem of unreasonable reference signal power selection is likely to occur, so that the AGC Gain Control value is unstable, and after AGC processing the input signal, the RF input signal cannot be basically stabilized in a reasonable amplitude range, and further, the problem of signal overflow or signal loss is likely to occur, which affects the reception and demodulation of the signal.
Therefore, there is a need to solve the following problems: how to maintain stable AGC gain control values in the NB-IoT.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide an automatic gain control method and apparatus, which can determine a power value of a suitable reference subframe in NB-IoT to perform automatic gain control, so as to maintain a stable AGC gain control value and avoid the problem of signal overflow or signal loss.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides an automatic gain control method, including: receiving a first downlink signal from a base station at a first time; determining a corresponding reference subframe in the first downlink signal based on the current working state of the user equipment, and calculating a power value of the reference subframe; receiving a second downlink signal from the base station at a second time after the first time; and performing automatic gain control on the second downlink signal based on the power value of the reference subframe.
In a second aspect, an embodiment of the present invention provides an automatic gain control apparatus, including: the device comprises a first receiving unit, a calculating unit, a second receiving unit and a control unit, wherein the first receiving unit is used for receiving a first downlink signal from a base station at a first moment; the calculating unit is configured to determine a corresponding reference subframe in the first downlink signal based on a current working state of the user equipment, and calculate a power value of the reference subframe; the second receiving unit is configured to receive a second downlink signal from the base station at a second time after the first time; the control unit is configured to perform automatic gain control on the second downlink signal based on the power value of the reference subframe.
The embodiment of the invention provides an automatic gain control method and device. First, after receiving a first downlink signal from a base station at a first time, a user equipment can determine a corresponding reference subframe in the first downlink signal according to a current working state of the user equipment, and calculate a power value of the reference subframe, and then, after receiving a second downlink signal at a second time, the user equipment can perform automatic gain control on the second downlink signal based on the power value of the reference subframe. Therefore, when the method is applied to NB-IoT, a proper power value of a reference subframe for AGC processing can be determined from the downlink signal of the first frame according to the current working state of the user equipment, and then a stable AGC gain control value can be maintained in the NB-IoT communication process, so that the RF input signal can be basically stabilized in a reasonable amplitude range through AGC processing, and the problems of signal overflow or signal loss are avoided.
Drawings
Fig. 1-1 is a schematic flow chart of an automatic gain control method according to a first embodiment of the present invention;
fig. 1-2 to fig. 1-4 are schematic diagrams illustrating power statistics of a reference subframe according to a first embodiment of the invention;
fig. 2 is a schematic flow chart illustrating an automatic gain control method according to a second embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating an automatic gain control method according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an automatic gain control apparatus according to a fourth embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In order to maintain a stable AGC gain control value in the NB-IoT based communication process and avoid the problem of signal overflow or signal loss from affecting the reception and demodulation of signals, embodiments of the present invention provide an automatic gain control method, which can be applied to the occasion where the ue needs to implement automatic gain control in the NB-IoT communication system.
Example one
Then, fig. 1-1 is a schematic flow chart of an automatic gain control method according to a first embodiment of the present invention, and referring to fig. 1-1, the automatic gain control method includes:
s101: receiving a first downlink signal from a base station at a first time;
specifically, in the process of communication between the user equipment and the base station based on the NB-IoT, the user equipment receives a first downlink signal from the base station through the antenna at a first time. In this way, after the user equipment captures the first downlink signal, the user equipment may determine, based on the first downlink signal, a power value of a reference subframe for performing AGC processing, so as to perform automatic gain control on a second downlink signal received by the user equipment at a second time after the first time.
S102: determining a corresponding reference subframe in the first downlink signal based on the current working state of the user equipment, and calculating a power value of the reference subframe;
specifically, in order to determine a power value of a suitable reference subframe for AGC processing to serve as a reference, considering that an NB-IoT communication system is a time division system, and a change of a signal amplitude is unstable in a period of time, after receiving a first downlink signal, a user equipment may first determine a suitable reference subframe corresponding to a current operating state from the first downlink signal according to a current operating state of the user equipment, and then calculate a power value of the reference subframe, so as to perform automatic gain control subsequently according to the power value of the reference subframe, thereby maintaining a stable AGC gain control value in an NB-IoT communication process.
In practical applications, the current working state of the ue may be classified according to whether the ue is currently in a downlink synchronization state, and at this time, the current working state of the ue may be in a non-downlink synchronization state or a downlink synchronization state. Of course, the current working state of the user equipment may also be classified in other manners, and the embodiment of the present invention is not specifically limited herein.
In a specific implementation process, the above S102 may, but is not limited to, include the following two embodiments according to a difference of a current operating state of the user equipment.
First, S102 may include: when determining that the user equipment is currently in a non-downlink synchronization state, acquiring a pre-judgment signal from a first downlink signal according to a preset time span value; calculating a power value on each subframe in the pre-judging signal; and determining the subframe with the maximum power value in each subframe as a reference subframe.
Specifically, since the ue is in a non-downlink synchronization state and does not timing synchronization information, a virtual frame may start from any position, and how to select a reasonable reference subframe becomes very difficult. Then, in order to solve the above problem, the ue may perform power statistics on each subframe within a preset time span value in the first downlink signal when determining that its working state is currently in a non-downlink synchronization state, and select a subframe with a largest power value among the subframes as a reference subframe for AGC power estimation.
Here, the preset time span value may be 5ms, 10ms, and the like, and a person skilled in the art sets itself according to a period, a property, and the like of a normal signaling in a downlink signal issued by a base station when the ue in NB-IoT is in a non-downlink synchronization state in a specific implementation process, and the embodiment of the present invention is not limited specifically.
Illustratively, for NB-IOT, the transmission period of a Primary Synchronization Signal (PSS) on a primary carrier within one radio frame is 5ms, and the PSS signals transmitted each time are identical, which means that there is always one subframe of the PSS signals within 5 ms. Therefore, the preset time span value may be set to 5ms, power statistics may be performed on 5 subframes within the 5ms range, and the subframe with the strongest power is determined as a reference subframe for AGC power estimation. In addition, for NB-IOT, the transmission period of the Secondary Synchronization Signal (SSS) is also 5ms, but SSS signals transmitted every 10ms are identical, and thus the preset time span value may also be set to 10 ms.
It should be noted that, when the preset time span value is set by the skilled person, it should be noted that the preset time span value cannot be too large, because for AGC, a performance index is a convergence speed, and when the preset time span value is too large, the AGC convergence time is too long, which may result in slow AGC convergence, and further, the performance requirement of the system is not satisfied.
Second, S102 may include: when determining that the user equipment is currently in a downlink synchronization state, determining a reference signal corresponding to the current working stage of the user equipment according to a preset strategy; and determining a subframe corresponding to the reference signal in the first downlink signal, and determining the subframe corresponding to the reference signal as the reference subframe.
In practical application, although the ue is in the downlink synchronization state, the timing synchronization information is already timed, but the normal signaling that the ue can receive is different when the ue is in different working stages in the downlink synchronization state, so in order to better maintain a stable AGC gain control value, reduce AGC convergence time, and improve AGC convergence speed, the ue needs to first select a corresponding reference signal for different working stages according to a preset policy, then determine a subframe corresponding to the reference signal in the first downlink signal, and finally determine the subframe corresponding to the reference signal as the reference subframe.
In a specific implementation process, the preset strategy may include, but is not limited to, the following two cases.
First, for synchronization convenience and time saving, the preset strategy may be to determine the SSS signal as a reference signal when the ue is in a Paging (Paging) phase in a downlink synchronization state.
In practical application, the SSS signal is pre-synchronized before Paging, so that for convenience of synchronization and time saving, when the ue is in a Paging stage in a downlink synchronization state, the SSS signal may be used as a reference signal for AGC adjustment along with receiving the SSS signal.
Second, the preset strategy is to detect whether a Physical Downlink Shared Channel (PDSCH) signal exists in the first Downlink signal within a preset time length when the ue is in a connection stage in a Downlink synchronization state; if the PDSCH signal is detected within the preset time length, determining the PDSCH signal as a reference signal; otherwise, the PSS signal or the SSS signal is determined as the reference signal.
In practical applications, when the ue is in a connected phase in a downlink synchronization state, considering that the ue may receive a secondary carrier instead of a primary carrier, in this case, in order to increase a convergence rate of the AGC process, a PDSCH signal may be used as a reference signal for the AGC process. However, when the user equipment receives the PDSCH signal for a period of time without the PDSCH signal, at this time, the power of the downlink signal received by the user equipment may change greatly, and thus cause a problem of reception, then, in order to better maintain a stable AGC gain control value, the user equipment may use the PDSCH signal as a reference signal for AGC adjustment when detecting that the PDSCH signal exists within a preset time period; further, the ue may need to switch to the primary carrier and receive a PSS signal or an SSS signal as a reference signal when it is determined that there is no PDSCH signal within the preset time period, so as to adjust the AGC gain control value within a reasonable range.
Certainly, there may be other preset strategies, such as determining the PSS signal as the reference signal when the ue is in the paging phase in the downlink synchronization state; or, when the ue is in a connection stage in a downlink synchronization state, determining the PSS signal as a reference signal without detecting whether the PDSCH signal exists, where embodiments of the present invention are not specifically limited herein.
In another embodiment of the present invention, in order to accurately calculate the power value of the reference subframe, S102 may include: segmenting a reference subframe to obtain at least two symbol groups; respectively calculating power values of at least two symbol groups; and determining the maximum power value of the at least two symbol groups as the power value of the reference subframe.
Specifically, in practical applications, in order to accurately calculate the power value of the reference subframe, a manner of segmenting the power estimation window of one subframe may be adopted to divide the power estimation window in one subframe into several segments, perform power statistics on symbol groups corresponding to each segment independently, and select the symbol group with the largest power to represent the power of the reference subframe.
For example, referring to fig. 1-2, for NB-IOT, it is assumed that the determined reference subframe carries the PSS signal. Then, in order to calculate the power value of the reference subframe more accurately, as shown in fig. 1 to 3, the power statistics may be performed on the reference subframe in segments, a symbol with a subframe length corresponding to the reference subframe is divided into three segments to obtain three symbol groups, each segment uses 1/3 subframes, and about 4.67 symbols, and then the power value of each symbol group is separately and independently counted in a power estimation window manner, so that since the total length of the PSS signal is 11 symbols, it means that there is always one power estimation window data segment completely falling on the PSS signal.
It should be noted that, referring to fig. 1 to 4, if the reference subframe is not subjected to the power statistics by segmentation, the power estimation window of one subframe may include all PSS signals, or may include only half PSS signals or less, which means that the power value of the reference subframe for performing the AGC processing in the non-downlink synchronization state is unstable, and thus, the AGC gain control value is also unstable, which affects the performance of the AGC processing.
Here, when a person skilled in the art segments the reference subframe, the specific number of segments and the specific length of the segments may be set by the person skilled in the art according to the debugging result in the specific implementation, and the embodiment of the present invention is not limited in particular. It should be noted that the segment cannot be too short, and if the segment is too short, the power value of the reference subframe obtained by statistics is necessarily inaccurate because of the low sampling rate. However, the segmentation cannot be too long, which may result in only a portion of the signal within the power estimation window, thereby causing a bias in the power value calculation of the reference subframe.
In the specific implementation process, the current working state of the user equipment can be determined by judging whether the user equipment completes the cell search process. Specifically, when the user equipment does not complete the cell search process, it can be determined that the user equipment is currently in a non-downlink synchronization state; and after the user equipment has finished the process of searching the district, can confirm that the user equipment is in the downstream synchronization state at present. Of course, other ways may also be adopted to determine the current operating state of the ue, which are determined by those skilled in the art in the specific implementation process, and the embodiment of the present invention is not limited in detail herein.
After performing S102, the user equipment may perform S103 to S104 to complete the automatic gain control process.
S103: receiving a second downlink signal from the base station at a second time after the first time;
here, in order to perform AGC processing on the second downlink signal using the power value of the reference subframe calculated from the first downlink signal and adjust the signal strength of the second downlink signal, the user equipment receives the second downlink signal at a second time after the first time corresponding to the reception of the first downlink signal.
S104: and performing automatic gain control on the second downlink signal based on the power value of the reference subframe.
Specifically, after the ue obtains the power value of the reference subframe calculated by the first downlink signal and also receives the second downlink signal from the base station at a second time after the first time, the ue may perform automatic gain control on the second downlink signal based on the power value of the reference subframe.
At this point, the automatic gain control process is completed.
As can be seen from the above, in the automatic gain control method provided in the embodiment of the present invention, first, after receiving a first downlink signal from a base station at a first time, a user equipment may determine a corresponding reference subframe in the first downlink signal according to its current working state, and calculate a power value of the reference subframe, and then, after receiving a second downlink signal from the base station at a second time after the first time, the user equipment performs automatic gain control on the second downlink signal based on the power value of the reference subframe. Therefore, in the NB-IoT communication process, by adopting the automatic gain control method, the user equipment can determine the proper reference subframe according to the current working state of the user equipment, so that the power value of the proper reference subframe can be obtained to perform automatic gain control. Then, the user equipment can maintain a stable AGC gain control value during NB-IoT communication, so that the RF input signal can be substantially stabilized within a reasonable amplitude range by the AGC process, thereby avoiding the problems of signal overflow or signal loss.
Example two
Based on the foregoing embodiment, in practical application, it is assumed that a current working state of a ue is distinguished by whether the ue is currently in a non-downlink synchronization state or a downlink synchronization state, at this time, this embodiment provides an automatic gain control method, and as shown in fig. 2, the automatic gain control method includes:
s201: receiving a first downlink signal from a base station at a first time;
s202: judging whether the current working state of the user equipment is in a non-downlink synchronous state or a downlink synchronous state;
specifically, when the user equipment determines that the current operating state of the user equipment is in the non-downlink synchronization state, S203 to S205 are performed to determine the reference subframe, or when the user equipment determines that the current operating state of the user equipment is in the downlink synchronization state, S206 to S207 are performed to determine the reference subframe.
S203: acquiring a pre-judgment signal from the first downlink signal according to a preset time span value;
s204: calculating a power value on each subframe in the pre-judging signal;
s205: determining the subframe with the maximum power value in each subframe as a reference subframe;
here, after the ue performs S205 to determine the reference subframe, the ue may perform S208 to S210.
S206: determining a reference signal corresponding to the current working stage of the user equipment according to a preset strategy;
s207: determining a subframe corresponding to a reference signal in the first downlink signal, and determining the subframe corresponding to the reference signal as a reference subframe;
here, after the ue performs S208 to determine the reference subframe, the ue may perform S208 to S210.
S208: calculating a power value of the reference subframe;
s209: receiving a second downlink signal from the base station at a second time after the first time;
s210: and performing automatic gain control on the second downlink signal based on the power value of the reference subframe.
In the automatic gain control method provided in this embodiment, after the ue receives the first downlink signal from the base station, the ue can determine a power value of the reference subframe according to its current working state, and then, after the ue receives the second downlink signal, the ue can perform automatic gain control on the second downlink signal based on the power value of the reference subframe. Therefore, when the user equipment is in a non-downlink synchronization state and a downlink synchronization state, a stable and reliable AGC gain control value can be obtained by taking the power value of the corresponding reference subframe as a reference, and thus, the problem of signal overflow or signal loss can be avoided when the second downlink signal is processed.
EXAMPLE III
Based on the foregoing embodiment, in practical applications, when the ue is currently in a downlink synchronization state, different working phases may also exist, such as a paging phase, a connection phase, and the like, and therefore, it is further necessary to further distinguish whether the ue is in the paging phase in the downlink synchronization state or in the connection phase in the downlink synchronization state, at this time, this embodiment provides an automatic gain control method, as shown in fig. 4, where the automatic gain control method includes:
s301: receiving a first downlink signal from a base station at a first time;
after the ue receives the first downlink signal, if the ue determines that its current operating state is in the downlink synchronization state, S302 may be performed.
S302: judging whether the user equipment is in a paging stage in a downlink synchronization state or in a connection stage in the downlink synchronization state;
in practical application, in order to better maintain a stable AGC gain control value, when the ue determines that its current operating state is in a downlink synchronization state, it needs to first determine whether the ue is in a paging phase in the downlink synchronization state or in a connection phase in the downlink synchronization state, and then select a corresponding reference signal for different operating phases, specifically, when the ue is in the paging phase in the downlink synchronization state, S303 is executed to determine the reference signal, and when the ue is in the connection phase in the downlink synchronization state, S304 is executed to determine the reference signal.
S303: determining the SSS signal as a reference signal;
after S303 is performed, S307 to S310 may be performed.
S304: detecting whether a PDSCH signal exists in a first downlink signal within a preset time length;
if the user equipment detects a PDSCH signal in the first downlink signal within a preset time period, performing S305; otherwise, S306 is executed.
S305: determining a PDSCH signal as a reference signal;
s306: determining a PSS signal or a SSS signal as a reference signal;
after performing S305 or S306, S307 to S310 may be performed.
S307: determining a subframe corresponding to the reference signal as a reference subframe;
s308: calculating a power value of the reference subframe;
s309: receiving a second downlink signal from the base station at a second time after the first time;
s310: and performing automatic gain control on the second downlink signal based on the power value of the reference subframe.
In the automatic gain control method provided in this embodiment, after receiving a first downlink signal from a base station, when determining that a user equipment is in a downlink synchronization state, the user equipment may first determine whether the user equipment is currently in a paging phase in the downlink synchronization state or in a connection phase in the downlink synchronization state; then, when the paging phase is determined, the user equipment determines the SSS signal as a reference signal; when the connection phase is determined, the user equipment detects whether a PDSCH signal exists in the first downlink signal within a preset time length, if so, the PDSCH signal is determined as a reference signal, otherwise, the PSS signal or the SSS signal is determined as the reference signal; and finally, the user equipment determines the subframe corresponding to the reference signal as a reference subframe, and then calculates the power value of the reference subframe. Therefore, after the user equipment receives the second downlink signal, the automatic gain control can be performed on the second downlink signal based on the power value of the reference subframe. Therefore, when the user equipment is in a downlink synchronization state, the user equipment can determine a proper reference signal according to the current working stage of the user equipment to obtain the power value of the reference subframe corresponding to the reference signal, and further, when the user equipment is in the downlink synchronization state, the stable and reliable AGC gain control value can be obtained by taking the power value of the reference subframe as a reference, so that the problem of signal overflow or signal loss can be avoided when the second downlink signal is processed.
Example four
Based on the same inventive concept, the present embodiment provides an automatic gain control apparatus. Fig. 4 is a schematic structural diagram of an automatic gain control apparatus according to a fourth embodiment of the present invention, and referring to fig. 4, the automatic gain control apparatus 40 includes: a first receiving unit 401, a calculating unit 402, a second receiving unit 403, and a control unit 404; the first receiving unit 401 is configured to receive a first downlink signal from a base station at a first time; a calculating unit 402, configured to determine a corresponding reference subframe in the first downlink signal based on a current operating state of the user equipment, and calculate a power value of the reference subframe; a second receiving unit 403, configured to receive a second downlink signal from the base station at a second time after the first time; a control unit 404, configured to perform automatic gain control on the second downlink signal based on the power value of the reference subframe.
Further, the calculating unit is further configured to obtain a pre-determined signal from the first downlink signal according to a preset time span value when it is determined that the user equipment is currently in a non-downlink synchronization state; calculating a power value on each subframe in the pre-judging signal; and determining the subframe with the maximum power value in each subframe as a reference subframe.
Further, the calculating unit is further configured to determine, according to a preset policy, a reference signal corresponding to a current working phase of the user equipment when it is determined that the user equipment is currently in the downlink synchronization state; and determining a subframe corresponding to the reference signal in the first downlink signal, and determining the subframe corresponding to the reference signal as the reference subframe.
Further, the calculating unit is further configured to determine, when the ue is in a paging phase in a downlink synchronization state, the secondary synchronization signal SSS as a reference signal; or, the ue is further configured to detect whether there is a PDSCH signal of a physical downlink shared channel in the first downlink signal within a preset time length when the ue is in a connection stage in a downlink synchronization state; if the PDSCH signal is detected within the preset time length, determining the PDSCH signal as a reference signal; otherwise, the primary synchronization signal PSS or SSS signal is determined as the reference signal.
Further, the calculating unit is further configured to segment the reference subframe to obtain at least two symbol groups; respectively calculating power values of at least two symbol groups; and determining the maximum power value of the at least two symbol groups as the power value of the reference subframe.
In practical applications, the first receiving unit and the second receiving unit may be implemented by an antenna, a transceiver, and the like. The calculating Unit and the controlling Unit may be implemented by a Central Processing Unit (CPU), a microprocessor Unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Here, it should be noted that: the above description of the embodiment of the apparatus is similar to the above description of the embodiment of the method, and has similar beneficial effects to the embodiment of the method, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, please refer to the description of the embodiments of the method of the present invention for understanding, and therefore, for brevity, will not be described again.
Here, it should be noted that:
it should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
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; can be located in one place or distributed on a plurality of 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, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art 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, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A method for automatic gain control, the method comprising:
receiving a first downlink signal from a base station at a first time;
determining a corresponding reference subframe in the first downlink signal based on the current working state of the user equipment, and calculating a power value of the reference subframe;
receiving a second downlink signal from the base station at a second time after the first time;
performing automatic gain control on the second downlink signal based on the power value of the reference subframe; wherein the content of the first and second substances,
the calculating the power value of the reference subframe comprises:
segmenting the reference subframe to obtain at least two symbol groups;
respectively calculating power values of the at least two symbol groups;
determining a maximum power value of the at least two symbol groups as a power value of the reference subframe.
2. The method of claim 1, wherein the determining a corresponding reference subframe in the first downlink signal based on a current operating state of the UE comprises:
when the user equipment is determined to be in a non-downlink synchronization state currently, acquiring a pre-judgment signal from the first downlink signal according to a preset time span value;
calculating a power value on each subframe in the prejudgment signal;
and determining the subframe with the maximum power value in each subframe as the reference subframe.
3. The method of claim 1, wherein the determining a corresponding reference subframe in the first downlink signal based on a current operating state of the UE comprises:
when the user equipment is determined to be in a downlink synchronization state currently, determining a reference signal corresponding to the current working stage of the user equipment according to a preset strategy;
and determining a subframe corresponding to the reference signal in the first downlink signal, and determining the subframe corresponding to the reference signal as the reference subframe.
4. The method according to claim 3, wherein when determining that the ue is currently in the downlink synchronization state, determining the reference signal corresponding to the current working phase of the ue according to a preset policy includes:
determining a secondary synchronization signal SSS as the reference signal when the UE is in a paging stage in a downlink synchronization state;
alternatively, the first and second electrodes may be,
when the user equipment is in a connection stage in a downlink synchronization state, detecting whether a Physical Downlink Shared Channel (PDSCH) signal exists in the first downlink signal within a preset time length; if the PDSCH signal is detected within a preset time length, determining the PDSCH signal as the reference signal; otherwise, determining a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS) as the reference signal.
5. An automatic gain control apparatus, comprising: a first receiving unit, a calculating unit, a second receiving unit and a control unit, wherein,
the first receiving unit is configured to receive a first downlink signal from a base station at a first time;
the calculating unit is configured to determine a corresponding reference subframe in the first downlink signal based on a current working state of the user equipment, and calculate a power value of the reference subframe;
the second receiving unit is configured to receive a second downlink signal from the base station at a second time after the first time;
the control unit is configured to perform automatic gain control on the second downlink signal based on the power value of the reference subframe;
the computing unit is further configured to segment the reference subframe to obtain at least two symbol groups; respectively calculating power values of the at least two symbol groups; determining a maximum power value of the at least two symbol groups as a power value of the reference subframe.
6. The apparatus according to claim 5, wherein the computing unit is further configured to obtain a pre-determined signal from the first downlink signal according to a preset time span value when it is determined that the ue is currently in a non-downlink synchronization state; calculating a power value on each subframe in the prejudgment signal; and determining the subframe with the maximum power value in each subframe as the reference subframe.
7. The apparatus according to claim 5, wherein the computing unit is further configured to determine, when it is determined that the ue is currently in a downlink synchronization state, a reference signal corresponding to a current working phase of the ue according to a preset policy; and determining a subframe corresponding to the reference signal in the first downlink signal, and determining the subframe corresponding to the reference signal as the reference subframe.
8. The apparatus of claim 7, wherein the computing unit is further configured to determine a Secondary Synchronization Signal (SSS) as the reference signal when the UE is in a paging phase in a downlink synchronization state; or, the ue is further configured to detect whether there is a PDSCH signal of a physical downlink shared channel in the first downlink signal within a preset time duration when the ue is in a connection stage in a downlink synchronization state; if the PDSCH signal is detected within a preset time length, determining the PDSCH signal as the reference signal; otherwise, determining a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS) as the reference signal.
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| CN201710092177.2A CN108462977B (en) | 2017-02-21 | 2017-02-21 | Automatic gain control method and device |
| PCT/CN2017/099254 WO2018153043A1 (en) | 2017-02-21 | 2017-08-28 | Method and apparatus for automatic gain control, and storage medium |
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| CN103841633A (en) * | 2012-11-27 | 2014-06-04 | 中兴通讯股份有限公司 | TD-LTE automatic gain control method and device |
| WO2015018033A1 (en) * | 2013-08-08 | 2015-02-12 | Mediatek Inc. | Uplink power control in adaptive tdd systems |
| CN106034102A (en) * | 2015-03-16 | 2016-10-19 | 苏州简约纳电子有限公司 | LTE terminal reception gain adjustment method |
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| EP2663140A1 (en) * | 2012-05-10 | 2013-11-13 | BlackBerry Limited | Power based gain control adjustment |
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| CN103841633A (en) * | 2012-11-27 | 2014-06-04 | 中兴通讯股份有限公司 | TD-LTE automatic gain control method and device |
| WO2015018033A1 (en) * | 2013-08-08 | 2015-02-12 | Mediatek Inc. | Uplink power control in adaptive tdd systems |
| CN106034102A (en) * | 2015-03-16 | 2016-10-19 | 苏州简约纳电子有限公司 | LTE terminal reception gain adjustment method |
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