CN113543298B - Timing synchronization method and base station - Google Patents
Timing synchronization method and base station Download PDFInfo
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- CN113543298B CN113543298B CN202110631260.9A CN202110631260A CN113543298B CN 113543298 B CN113543298 B CN 113543298B CN 202110631260 A CN202110631260 A CN 202110631260A CN 113543298 B CN113543298 B CN 113543298B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a timing synchronization method and a base station, wherein the method comprises the following steps: determining an adjustment parameter according to first cross-correlation information of a preamble sequence and a received first signal sequence in response to the first cross-correlation information meeting a preset condition; determining a user terminal set, and respectively adjusting the power interval of each user terminal in the user terminal set according to the adjustment parameters, wherein the power interval of each user terminal before adjustment is smaller than the power interval of a first user terminal corresponding to the first signal sequence; and in response to receiving a second signal sequence which is sent by a second user terminal with the largest power interval in the terminal set, determining timing synchronization time according to second cross-correlation information of the second signal sequence and the preamble sequence. The accuracy of timing synchronization can be improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a timing synchronization method and a base station.
Background
At present, when a receiving end performs timing synchronization, it is not feasible to perform timing synchronization only by determining whether the peak extremum of the autocorrelation function of the preamble sequence and the signal sequence exceeds a threshold value because the signal transceiving power allocated to each user terminal is uneven. For example, when the transceiving power allocated to the user terminal is low and the channel environment noise interference is large, the peak extremum of the cross-correlation function between the preamble sequence and the signal sequence is not easily monitored, thereby causing timing deviation.
Disclosure of Invention
Therefore, the invention provides a timing synchronization method and a base station, which aim to solve the defects in the prior art.
In order to achieve the above object, a first aspect of the present invention provides a timing synchronization method, including:
determining an adjustment parameter according to first cross-correlation information of a preamble sequence and a received first signal sequence in response to the first cross-correlation information meeting a preset condition;
determining a user terminal set, and respectively adjusting the power interval of each user terminal in the user terminal set according to the adjustment parameters, wherein the power interval of each user terminal before adjustment is smaller than the power interval of a first user terminal corresponding to the first signal sequence;
and in response to receiving a second signal sequence which is sent by a second user terminal with the largest power interval in the terminal set, determining timing synchronization time according to second cross-correlation information of the second signal sequence and the preamble sequence.
In some embodiments, the first cross-correlation information is a function of power with respect to time, and the first cross-correlation information satisfies a preset condition, including:
the first cross-correlation information has a peak extremum, the peak extremum is located in a second power interval corresponding to the preamble sequence, and the maximum value of the first cross-correlation information is located in a power interval of the first user terminal within a preset time length, wherein the time corresponding to the peak extremum falls within the preset time length.
In some embodiments, the determining an adjustment parameter from the first cross-correlation information comprises:
determining an average value of the first cross-correlation information within the preset time length;
and determining an adjusting parameter according to the average value, the peak extreme value and the maximum value.
In some embodiments, prior to said determining an adjustment parameter from said first cross-correlation information, said method further comprises:
determining the distribution parameters of each user terminal according to the received tracking reference signal PT-RS and sounding reference signal SRS sent by each user terminal;
allocating initial power intervals to the user terminals according to the allocation parameters of the user terminals and the total transmission power of the base station, wherein the initial power interval of each user terminal is continuous with the initial power interval of at least one other user terminal, and the initial power intervals of any two user terminals do not have intersection;
and aiming at two user terminals adjacent to the initial power interval, distributing the power interval for the user terminal with the larger initial power interval in the two user terminals according to the initial power intervals of the two user terminals and the signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals.
In some embodiments, the allocating, according to the initial power intervals of the two ues and the snr information sent by the ue with the smaller initial power interval of the two ues, a power interval for the ue with the larger initial power interval of the two ues includes:
determining protection power according to the initial power intervals of the two user terminals and signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals;
and adjusting the minimum value of the initial power interval of the user terminal with larger initial power interval in the two user terminals according to the protection power.
In order to achieve the above object, a second aspect of the present invention provides a base station, comprising:
a receiving module, configured to receive a first signal sequence and to receive a second signal sequence;
the first processing module is used for determining an adjusting parameter according to first cross-correlation information in response to the fact that the first cross-correlation information of the preamble sequence and the first signal sequence received by the receiving module meets a preset condition;
a second processing module, configured to determine a user terminal set, and respectively adjust a power interval of each user terminal in the user terminal set according to the adjustment parameter, where the power interval of each user terminal before adjustment is smaller than a power interval of a first user terminal corresponding to the first signal sequence;
and a third processing module, configured to determine, in response to the receiving module receiving a second signal sequence and the second signal sequence being sent by a second user terminal with a largest power interval in the terminal set, a timing synchronization time according to second cross-correlation information between the second signal sequence and the preamble sequence.
In some embodiments, the first cross-correlation information is a function of power with respect to time, and the first cross-correlation information satisfies a preset condition, including:
the first cross-correlation information has a peak extremum, the peak extremum is located in a second power interval corresponding to the preamble sequence, and the maximum value of the first cross-correlation information is located in a power interval of the first user terminal within a preset time length, wherein the time corresponding to the peak extremum falls within the preset time length.
In some embodiments, the first processing module is configured to:
determining an average value of the first cross-correlation information within the preset time length;
and determining an adjusting parameter according to the average value, the peak extreme value and the maximum value.
In some embodiments, the receiving module is further configured to receive a tracking reference signal PT-RS and a sounding reference signal SRS sent by each user equipment;
the first processing module is further configured to determine allocation parameters of each user terminal according to the received tracking reference signal PT-RS and sounding reference signal SRS sent by each user terminal;
the second processing module is further configured to:
allocating initial power intervals to the user terminals according to the allocation parameters of the user terminals and the total transmission power of the base station, wherein the initial power interval of each user terminal is continuous with the initial power interval of at least one other user terminal, and the initial power intervals of any two user terminals do not have intersection;
and aiming at two user terminals adjacent to the initial power interval, distributing the power interval for the user terminal with the larger initial power interval in the two user terminals according to the initial power intervals of the two user terminals and the signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals.
In some embodiments, the second processing module is to:
determining protection power according to the initial power intervals of the two user terminals and signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals;
and adjusting the minimum value of the initial power interval of the user terminal with the larger initial power interval in the two user terminals according to the protection power.
The invention has the following advantages:
in the timing synchronization method provided by the embodiment of the present invention, it is determined that a currently received first signal sequence interferes with a signal sent by a user terminal corresponding to a preamble sequence by judging that first cross-correlation information of the preamble sequence and the received first signal sequence satisfies a preset condition, in this case, an adjustment parameter is determined according to the first cross-correlation information, a user terminal set including user terminals whose power intervals before adjustment are smaller than that of the first user terminal corresponding to the signal sequence is determined, and power intervals of the user terminals are respectively adjusted according to the adjustment parameter; when receiving a second signal sequence sent by a second user terminal with the largest power interval in the user terminal set, because interference is eliminated by adjusting the power interval of each user terminal, the peak extreme value of second cross-correlation information of the second signal sequence sent by the second user terminal and the leader sequence is easy to monitor, and the timing synchronization time can be directly determined according to the second cross-correlation information, so that the accuracy of timing synchronization is improved.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic flowchart of a timing synchronization method according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for determining an adjustment parameter according to first cross-correlation information according to an embodiment of the present invention;
fig. 3 is a first flowchart illustrating a method for allocating power intervals to user terminals according to an embodiment of the present invention;
fig. 4 is a second flowchart illustrating a method for allocating power intervals to user terminals according to an embodiment of the present invention;
fig. 5 is a block diagram of a base station according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention and are not limiting of the invention.
It is to be understood that the various embodiments and features of the embodiments may be combined with each other without conflict.
It is to be understood that, for the convenience of description, only parts related to the present invention are shown in the drawings of the present invention, and parts not related to the present invention are not shown in the drawings.
It should be understood that each unit and module related in the embodiments of the present invention may correspond to only one physical structure, may also be composed of multiple physical structures, or multiple units and modules may also be integrated into one physical structure.
It will be understood that, without conflict, the functions, steps, etc. noted in the flowchart and block diagrams of the present invention may occur in an order different from that noted in the figures.
It is to be understood that the flowchart and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatus, devices and methods according to various embodiments of the present invention. Each block in the flowchart or block diagrams may represent a unit, module, segment, code, which comprises executable instructions for implementing the specified function(s). Furthermore, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by a hardware-based system that performs the specified functions or by a combination of hardware and computer instructions.
It is to be understood that the units and modules involved in the embodiments of the present invention may be implemented by software, and may also be implemented by hardware, for example, the units and modules may be located in a processor.
As shown in fig. 1, an embodiment of the present invention provides a timing synchronization method, which may be used in a base station or a Central Unit (CU) of the base station, where the method may include the following steps:
s11, in response to that the first cross-correlation information of the preamble sequence and the received first signal sequence satisfies a preset condition, determining an adjustment parameter according to the first cross-correlation information.
Wherein the cross-correlation information is a cross-correlation function.
The base station issues the allocated power interval and the signal sequence for timing synchronization (i.e., packet header) to each ue in advance, and the base station holds each preamble sequence corresponding to each signal sequence. Each user terminal sends signals according to the power interval and the signal sequence sent by the base station.
When a signal is transmitted from a ue to a bs, a SIC (Successive Interference Cancellation) receiver of the bs recovers the signal (including a signal sequence). When the base station receives a signal sequence sent by a certain user terminal, the base station performs cross-correlation operation on the signal sequence and each preset leader sequence respectively to obtain a cross-correlation function so as to determine the identity of the user terminal sending the signal sequence. For example, if a peak extremum occurs in the cross-correlation function between the signal sequence and the preamble sequence, and the maximum value of the cross-correlation function falls within a power interval allocated by the ue corresponding to the preamble sequence within a preset time period including a time corresponding to the peak extremum, the signal sequence may be considered to be transmitted by the ue corresponding to the preamble sequence.
In this process, if the base station determines that the first cross-correlation information of the currently received first signal sequence and a certain preamble sequence satisfies the preset condition, it may be indicated that the currently received first signal sequence will interfere with a signal sent by a user terminal corresponding to the "certain preamble sequence", but the signal sent by the user terminal with a larger power interval generally interferes with a signal sent by a user terminal with a smaller power interval, and at this time, the base station may eliminate interference by adjusting the power interval allocated to the user terminal, and then the base station may first determine the adjustment parameter according to the first cross-correlation information.
And S12, determining a user terminal set, and respectively adjusting the power interval of each user terminal in the user terminal set according to the adjustment parameters.
And the power interval of each user terminal before adjustment is smaller than the power interval of the first user terminal corresponding to the first signal sequence.
Since the currently received first signal sequence will interfere with the signal transmitted by the ue corresponding to the "certain preamble sequence", the power interval of the ue corresponding to the "certain preamble sequence" needs to be adjusted. However, if only the power interval of the ue corresponding to the "certain preamble sequence" is adjusted, the signal transmitted by the ue corresponding to the "certain preamble sequence" after adjustment may interfere with the signal transmitted by other ues (i.e. ues having a power interval smaller than the adjusted power interval of the ue corresponding to the "certain preamble sequence"), so that the power interval of each ue having a power interval smaller than the power interval of the first ue corresponding to the received first signal sequence before adjustment needs to be adjusted, and the ue set is the set of ues having power intervals that need to be adjusted.
And S13, in response to receiving the second signal sequence which is sent by the second user terminal with the largest power interval in the terminal set, determining the timing synchronization moment according to the second cross-correlation information of the second signal sequence and the preamble sequence.
The second user terminal is the user terminal with the largest power interval in the user terminal set; and, the second user equipment is the user equipment corresponding to the preamble sequence as described above.
When the base station receives the signal sequence again, if a peak extremum occurs in the currently received second signal sequence and the second cross-correlation information of the preamble sequence, and the maximum value of the second cross-correlation information falls within the power interval allocated by the user terminal corresponding to the preamble sequence within the preset time duration including the time corresponding to the peak extremum, it may be indicated that the currently received second signal sequence is sent by the second user terminal.
Since the base station has already adjusted the power intervals of the user terminals in the user terminal set according to the adjustment parameter, at this time, the signal (including the second signal sequence) sent by the second user terminal received by the base station will not be interfered by the first signal sequence in S11, therefore, in response to receiving the second signal sequence and the second signal sequence being sent by the second user terminal with the largest power interval in the terminal set, the base station may directly determine the timing synchronization time according to the second cross-correlation information, and specifically, the time corresponding to the peak extremum of the second cross-correlation information may be determined as the timing synchronization time.
It is seen from the foregoing steps S11-S13 that, in the timing synchronization method provided in the embodiment of the present invention, it is determined that the currently received first signal sequence interferes with a signal sent by a user terminal corresponding to the preamble sequence by determining that first cross-correlation information of the preamble sequence and the received first signal sequence satisfies a preset condition, in this case, an adjustment parameter is determined according to the first cross-correlation information, a user terminal set including user terminals whose power intervals before adjustment are smaller than a power interval of the first user terminal corresponding to the signal sequence is determined, and power intervals of the user terminals are respectively adjusted according to the adjustment parameter; when a second signal sequence sent by a second user terminal with the largest power interval in the user terminal set is received, because interference is eliminated by adjusting the power interval of each user terminal, the peak extreme value of second cross-correlation information of the second signal sequence sent by the second user terminal and the preamble sequence is easy to monitor, and the timing synchronization moment can be directly determined according to the second cross-correlation information, so that the accuracy of timing synchronization is improved.
In some embodiments, the first cross-correlation information is a function of power with respect to time, and the first cross-correlation information satisfies a preset condition (i.e., described in S11), which may include:
the first cross-correlation information has a peak extremum, the peak extremum is located in a second power interval corresponding to the preamble sequence, and a maximum value of the first cross-correlation information is located in a power interval of the first user terminal within a preset time, wherein a time corresponding to the peak extremum falls within the preset time.
Although the first cross-correlation information has a peak extremum, and the peak extremum is located in the second power interval corresponding to the preamble sequence (i.e. the power interval of the second user terminal), since the maximum value of the first cross-correlation information is located in the power interval of the first user terminal within the preset time period, it indicates that the received first signal sequence is not transmitted by the second user terminal but transmitted by the first user terminal, at this time, for the signal transmitted by the second user terminal, the signal transmitted by the first user terminal is equivalent to noise, that is, the signal transmitted by the first user terminal will interfere with the signal transmitted by the second user terminal, so that synchronization deviation occurs when the signal transmitted by the second user terminal is subjected to timing synchronization.
As shown in fig. 2, in some embodiments, the determining the adjustment parameter according to the first cross-correlation information (i.e., as described in S11) may include the following steps:
s21, determining an average value of the first cross-correlation information within a preset time period.
The preset time duration is a time duration including a time T corresponding to a peak extremum of the first cross-correlation information, and may be, for example, the time duration of the first 5 seconds and the time duration of the second 5 seconds before the time T.
And S22, determining an adjusting parameter according to the average value, the peak extreme value and the maximum value.
Wherein the maximum value is the maximum value of the first cross-correlation information within a preset time length.
In some embodiments, the tuning parameter D may be determined using equation (1):
wherein, C is an average value of the first cross-correlation information within a preset time length, B is a peak extreme value of the first cross-correlation information, and a is a maximum value of the first cross-correlation information within the preset time length.
As shown in fig. 3, in some embodiments, before determining the adjustment parameter from the first cross-correlation information (i.e., S11), the method may further include the steps of:
and S31, determining the allocation parameters of each user terminal according to the received tracking reference signal PT-RS and sounding reference signal SRS sent by each user terminal.
When each user terminal sends a random access request message to the base station, the random access request message carries a phase tracking reference signal PT-RS and a sounding reference signal SRS, the base station can determine a deviation function Y1 of the user terminal in a phase domain according to the PT-RS, determine a deviation function Y2 of the user terminal in a time domain according to the SRS, and then determine an allocation parameter K of the user terminal according to Y1 and Y2.
In some embodiments, equation (2) may be employed to determine the allocation parameter K for user terminal n n ：
Where n is the identifier of the ue, t is time, and the coefficient 1 and the coefficient 2 can be set according to the actual situation, Y1 n As a function of the deviation of the user n in the phase domain, Y2 n Is a function of the deviation of user n in the time domain.
And S32, allocating initial power interval for each user terminal according to the allocation parameters of each user terminal and the total transmission power of the base station.
The initial power interval of each ue is continuous with the initial power interval of at least another ue, and there is no intersection between the initial power intervals of any two ues.
The base station can distribute the parameter K according to each user terminal n And the total transmitting power P of the base station is the initial power interval P 'allocated to each user terminal' n 。
For example, P is 150W, 4 UEs in total, and the allocation parameter has a ratio K 1 ：K 2 ：K 3 ：K 4 P can be divided into four parts of 80W, 40W, 20W and 10W according to the ratio, wherein P' 1 ＝[70W，150W]，P’ 2 ＝[30W，70W]，P’ 3 ＝[10W，30W]，P’ 4 ＝[0W，10W]. The initial power interval of the user 1 is continuous with the initial power interval of the user 2, the initial power interval of the user 4 is continuous with the initial power interval of the user 3, the initial power interval of the user 2 is continuous with the initial power intervals of the users 1 and 3, and the initial power interval of the user 3 is continuous with the initial power intervals of the users 2 and 4.
Because the base station determines the distribution parameters according to the deviation function Y1 of the user terminal in the phase domain and the deviation function Y2 in the time domain, and distributes the initial power interval for each user terminal according to the proportion of the distribution parameters of each user terminal and the total transmission power of the base station, the user terminal with large phase deviation can be distributed with more power, and the user terminal with unstable amplitude variation of the reference signal can also be distributed with more power.
And S33, aiming at two user terminals adjacent to the initial power interval, distributing the power interval for the user terminal with larger initial power interval in the two user terminals according to the initial power interval of the two user terminals and the signal-to-noise ratio information sent by the user terminal with smaller initial power interval in the two user terminals.
After the initial power interval is allocated to each user terminal, the initial power intervals of each user terminal may be sorted in a descending order or a descending order, and then the larger initial power interval is adjusted according to the two adjacent initial power intervals and the signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals, so as to allocate the power interval to the user terminal with the larger initial power interval.
As shown in fig. 4, in some embodiments, the allocating a power interval to the ue with the larger initial power interval (i.e. described in S33) according to the initial power intervals of the two ues and the snr information sent by the ue with the smaller initial power interval of the two ues may include:
and S331, determining the protection power according to the initial power intervals of the two user terminals and the signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals.
The protection power F may be determined according to the two adjacent initial power intervals and an SNR (Signal Noise Ratio) corresponding to a smaller initial power interval.
In some embodiments, formula (3) may be employed to determine the protection power F Rear end ：
Wherein, P' Front side Denotes the larger of two adjacent initial power intervals, P' Rear end Represents the smaller of two adjacent initial power intervals, SNR Rear end And the signal-to-noise ratio information is sent by the user terminal with the smaller initial power interval in the two user terminals.
S332, adjusting the minimum value of the initial power interval of the user terminal with the larger initial power interval in the two user terminals according to the protection power.
Determining a protection power F Rear end Then, can be according to F Rear end To adjust P' Front part To obtain P Front side . For example, P' Front side ＝[70W，150W]，F Rear end When the result is 5, then P Front side Can be [75W, 150W ]]。
According to the initial power intervals of two user terminals and signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals, the protection power for protecting the smaller initial power interval in the two adjacent initial power intervals is determined, after the minimum value of the initial power interval of the user terminal with the larger initial power interval in the two user terminals is adjusted according to the protection power, the power intervals of the two user terminals are still adjacent, but a section of power protection interval (or fading neutral position) exists between any two adjacent power intervals, and the condition that the signal sent by the user terminal with the larger power interval interferes with the signal sent by the user terminal with the smaller power interval can be reduced to a certain extent.
It should be noted that the SNR information may be transmitted by the ue when transmitting the PT-RS and SRS to the base station.
In some embodiments, after allocating, for the two ues adjacent to the initial power interval, a power interval for the ue with the larger initial power interval of the two ues according to the initial power interval of the two ues and the snr information sent by the ue with the smaller initial power interval of the two ues (i.e., S33), the method may further include the following steps: and respectively transmitting a notification message carrying the power interval and the signal sequence to each user terminal so that each user terminal can transmit signals according to the power interval and the signal sequence transmitted by the base station.
As shown in fig. 5, based on the same technical concept, an embodiment of the present invention further provides a base station, configured to perform the timing synchronization method provided in the foregoing embodiments, where the base station may include:
a receiving module 101 is configured to receive a first signal sequence and to receive a second signal sequence.
A first processing module 102, configured to determine an adjustment parameter according to first cross-correlation information of a preamble sequence and a first signal sequence received by the receiving module, in response to that the first cross-correlation information satisfies a preset condition.
A second processing module 103, configured to determine a user terminal set, and respectively adjust a power interval of each user terminal in the user terminal set according to the adjustment parameter, where the power interval of each user terminal before adjustment is smaller than the power interval of the first user terminal corresponding to the first signal sequence.
A third processing module 104, configured to determine, in response to the receiving module receiving a second signal sequence and the second signal sequence is sent by a second user terminal with a largest power interval in the terminal set, a timing synchronization time according to second cross-correlation information between the second signal sequence and the preamble sequence.
In some embodiments, the first cross-correlation information is a function of power over time, the first cross-correlation information satisfying a preset condition, including:
the first cross-correlation information has a peak extremum, the peak extremum is located in a second power interval corresponding to the preamble sequence, and the maximum value of the first cross-correlation information is located in a power interval of the first user terminal within a preset time length, wherein a time corresponding to the peak extremum falls within the preset time length.
In some embodiments, the first processing module 102 is configured to:
determining an average value of the first cross-correlation information in the preset time length;
and determining an adjusting parameter according to the average value, the peak extreme value and the maximum value.
In some embodiments, the receiving module 101 is further configured to receive a tracking reference signal PT-RS and a sounding reference signal SRS sent by each user terminal.
The first processing module is further configured to determine allocation parameters of each user terminal according to the received tracking reference signal PT-RS and sounding reference signal SRS sent by each user terminal.
The second processing module is further configured to:
allocating initial power intervals to the user terminals according to the allocation parameters of the user terminals and the total transmission power of the base station, wherein the initial power interval of each user terminal is continuous with the initial power interval of at least one other user terminal, and the initial power intervals of any two user terminals do not have intersection;
and aiming at two user terminals adjacent to the initial power interval, distributing the power interval for the user terminal with the larger initial power interval in the two user terminals according to the initial power intervals of the two user terminals and the signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals.
In some embodiments, the second processing module 103 is configured to:
determining protection power according to the initial power intervals of the two user terminals and signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals;
and adjusting the minimum value of the initial power interval of the user terminal with larger initial power interval in the two user terminals according to the protection power.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A method of timing synchronization, the method comprising:
determining an adjustment parameter according to first cross-correlation information of a preamble sequence and a received first signal sequence in response to the first cross-correlation information meeting a preset condition;
determining a user terminal set, and respectively adjusting the power interval of each user terminal in the user terminal set according to the adjustment parameters, wherein the power interval of each user terminal before adjustment is smaller than the power interval of a first user terminal corresponding to the first signal sequence;
in response to receiving a second signal sequence which is sent by a second user terminal with the largest power interval in the terminal set, determining a timing synchronization time according to second cross-correlation information of the second signal sequence and the preamble sequence;
wherein the first cross-correlation information is a function of power with respect to time, and the first cross-correlation information satisfies a preset condition, and includes:
the first cross-correlation information has a peak extremum, the peak extremum is located in a second power interval corresponding to the preamble sequence, and the maximum value of the first cross-correlation information is located in a power interval of the first user terminal within a preset time length, wherein a time corresponding to the peak extremum falls within the preset time length, and the second power interval is a power interval of the second user terminal.
2. The method of claim 1, wherein determining an adjustment parameter based on the first cross-correlation information comprises:
determining an average value of the first cross-correlation information within the preset time length;
and determining an adjusting parameter according to the average value, the peak extreme value and the maximum value.
3. The method of claim 1, wherein prior to said determining an adjustment parameter from said first cross-correlation information, the method further comprises:
determining the distribution parameters of each user terminal according to the received tracking reference signal PT-RS and sounding reference signal SRS sent by each user terminal;
allocating initial power intervals to the user terminals according to the allocation parameters of the user terminals and the total transmission power of the base station, wherein the initial power interval of each user terminal is continuous with the initial power interval of at least one other user terminal, and the initial power intervals of any two user terminals do not have intersection;
and aiming at two user terminals adjacent to the initial power interval, distributing the power interval for the user terminal with the larger initial power interval in the two user terminals according to the initial power intervals of the two user terminals and the signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals.
4. The method of claim 3, wherein the allocating a power interval for the ue with a larger initial power interval according to the initial power intervals of the two ues and the snr information sent by the ue with a smaller initial power interval of the two ues comprises:
determining protection power according to the initial power intervals of the two user terminals and signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals;
and adjusting the minimum value of the initial power interval of the user terminal with the larger initial power interval in the two user terminals according to the protection power.
5. A base station, characterized in that the base station comprises:
a receiving module, configured to receive a first signal sequence and to receive a second signal sequence;
the first processing module is used for determining an adjusting parameter according to first cross-correlation information in response to the fact that the first cross-correlation information of the preamble sequence and the first signal sequence received by the receiving module meets a preset condition;
a second processing module, configured to determine a user terminal set, and respectively adjust a power interval of each user terminal in the user terminal set according to the adjustment parameter, where the power interval of each user terminal before adjustment is smaller than the power interval of the first user terminal corresponding to the first signal sequence;
a third processing module, configured to determine, in response to the receiving module receiving a second signal sequence and the second signal sequence being sent by a second user terminal with a largest power interval in the terminal set, a timing synchronization time according to second cross-correlation information between the second signal sequence and the preamble sequence;
wherein the first cross-correlation information is a function of power with respect to time, and the first cross-correlation information satisfies a preset condition, and includes:
the first cross-correlation information has a peak extremum, the peak extremum is located in a second power interval corresponding to the preamble sequence, and the maximum value of the first cross-correlation information is located in a power interval of the first user terminal within a preset time length, wherein the time corresponding to the peak extremum falls into the preset time length, and the second power interval is the power interval of the second user terminal.
6. The base station of claim 5, wherein the first processing module is configured to:
determining an average value of the first cross-correlation information within the preset time length;
and determining an adjusting parameter according to the average value, the peak extreme value and the maximum value.
7. The base station of claim 5, wherein the receiving module is further configured to receive a tracking reference signal PT-RS and a sounding reference signal SRS sent by each ue;
the first processing module is further configured to determine allocation parameters of each user terminal according to the received tracking reference signal PT-RS and sounding reference signal SRS sent by each user terminal;
the second processing module is further configured to:
allocating initial power intervals to the user terminals according to the allocation parameters of the user terminals and the total transmission power of the base station, wherein the initial power interval of each user terminal is continuous with the initial power interval of at least one other user terminal, and the initial power intervals of any two user terminals do not have intersection;
and aiming at two user terminals adjacent to the initial power interval, distributing the power interval for the user terminal with the larger initial power interval in the two user terminals according to the initial power intervals of the two user terminals and the signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals.
8. The base station of claim 7, wherein the second processing module is configured to:
determining protection power according to the initial power intervals of the two user terminals and signal-to-noise ratio information sent by the user terminal with the smaller initial power interval in the two user terminals;
and adjusting the minimum value of the initial power interval of the user terminal with the larger initial power interval in the two user terminals according to the protection power.
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