CN111885697A - Method for power control and uplink synchronization, related device and computer storage medium - Google Patents
Method for power control and uplink synchronization, related device and computer storage medium Download PDFInfo
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- H—ELECTRICITY
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- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The application provides a method for power control and uplink synchronization, a related device and a computer storage medium, wherein the method for power control comprises the following steps: calculating to obtain the current transmitting power of a physical uplink control channel before sending an uplink signal through the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion; calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power; and taking the current transmission power as the transmission power of the data signal part of the uplink signal, and taking the first transmission power as the transmission power of the reference signal part of the uplink signal. By only improving the transmission power of the reference signal part, the accuracy of parameters such as the estimated time offset value, the channel response, the frequency offset value and the like is ensured, and the terminal cannot be subjected to too much power consumption.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method for power control and uplink synchronization, a related device, and a computer storage medium.
Background
When a terminal sends data to a gateway station, there is a transmission delay caused by a transmission distance, so in order to send the data to the gateway station at a desired time and ensure the orthogonality of uplink transmission, it is necessary to estimate the time for sending the data in advance and send the data in advance according to the estimated time, thereby realizing uplink timing synchronization of each terminal.
In the field of satellite communication, a terminal may send an Uplink signal to a gateway station through a Physical Uplink Control Channel (PUCCH), and then the gateway station estimates a time offset value according to the Uplink signal and issues a time adjustment command of the estimated time offset value to the terminal, so that the terminal adjusts the sending time of data according to the time adjustment command, thereby implementing Uplink timing synchronization.
However, the current transmit power calculated by using the transmit power calculation formula of the physical uplink control channel is used as the transmit power transmitted by the terminal PUCCH, and the signal-to-noise ratio of the uplink signal is relatively low due to the small transmit power, so that it is not possible to effectively ensure that the accurate time offset value is estimated.
Disclosure of Invention
Based on the above deficiencies of the prior art, the present application provides a method for power control and uplink synchronization, a related device, and a computer storage medium, so as to solve the problem that the time offset value cannot be accurately estimated in the prior art, where the transmit power obtained through a calculation formula is used as an uplink signal transmitted to a PUCCH by a terminal.
In order to achieve the above object, the present application provides the following technical solutions:
a first aspect of the present application provides a method for controlling power of a channel, including:
calculating to obtain the current transmitting power of a physical uplink control channel before sending an uplink signal through the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power;
and taking the current transmission power as the transmission power of the data signal part of the uplink signal, and taking the first transmission power as the transmission power of the reference signal part of the uplink signal.
Optionally, in the above method for controlling power of a channel, the calculating, by using the current transmit power, a first transmit power includes:
calculating the sum of the current transmitting power and a reference signal power offset value to obtain an operation transmitting power; wherein the reference signal power offset value is a difference value of transmission power of a reference signal part and a data signal part configured in a communication protocol;
determining the smaller value of the operation transmitting power and the current maximum output power as the first transmitting power by comparing the magnitude relation between the operation transmitting power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
Optionally, in the above method for controlling power of a channel, the using the current transmission power as the transmission power of the data signal portion of the uplink signal, and using the first transmission power as the transmission power of the reference signal portion of the uplink signal includes:
converting the first transmission power into a first amplitude adjustment value and converting the current transmission power into a second amplitude adjustment value;
carrying out amplitude adjustment on a reference signal part of the uplink signal by using the first amplitude adjustment value, and carrying out amplitude adjustment on a data signal part of the uplink signal by using the second amplitude adjustment value; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
A second aspect of the present application provides a method for uplink timing synchronization, including:
before sending an uplink signal to a gateway station through a physical uplink control channel, calculating to obtain the current transmitting power of the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power and meets channel estimation requirements;
using the current transmission power as the transmission power of the data signal part of the uplink signal, using the first transmission power as the transmission power of the reference signal part of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel;
receiving a time adjustment command issued by the gateway station; the time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station;
and adjusting the uplink sending time according to the time adjusting command.
Optionally, in the uplink timing synchronization method, the calculating to obtain the first transmit power by using the current transmit power includes:
calculating the sum of the current transmitting power and a reference signal power offset value to obtain an operation transmitting power; the reference signal power offset value is the difference value of the transmission power of a reference signal part and a data signal part configured in a communication protocol;
determining the smaller value of the operation transmitting power and the current maximum output power as the first transmitting power by comparing the magnitude relation between the operation transmitting power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
Optionally, in the above method for uplink timing synchronization, the using the current transmission power as the transmission power of the data signal portion of the uplink signal, and using the first transmission power as the transmission power of the reference signal portion of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel includes:
converting the first transmission power into a first amplitude adjustment value and converting the current transmission power into a second amplitude adjustment value;
carrying out amplitude adjustment on a reference signal part of the uplink signal generated by the physical layer by using the first amplitude adjustment value, and carrying out amplitude adjustment on a data signal part of the uplink signal generated by the physical layer by using the second amplitude adjustment value;
sending the uplink signal subjected to amplitude adjustment to the gateway station through the physical uplink control channel; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
A third aspect of the present application provides a power control apparatus for a channel, including:
the first calculation unit is used for calculating the current transmitting power of the physical uplink control channel before the uplink signal is sent through the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
the second calculation unit is used for calculating to obtain first transmission power by using the current transmission power; wherein the first transmit power is greater than the current transmit power;
and the adjusting unit is used for taking the current transmission power as the transmission power of the data signal part of the uplink signal and taking the first transmission power as the transmission power of the reference signal part of the uplink signal.
Optionally, in the above power control device for a channel, the second calculating unit includes:
the second calculating subunit is used for calculating the sum of the current transmitting power and the reference signal power offset value to obtain the calculated transmitting power; wherein the reference signal power offset value is a difference value of transmission power of a reference signal part and a data signal part configured in a communication protocol;
a determining unit, configured to determine, as the first transmit power, a smaller value of the operational transmit power and the current maximum output power by comparing a magnitude relationship between the operational transmit power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
Optionally, in the above power control device for a channel, the adjusting unit includes:
a conversion unit, configured to convert the first transmit power into a first amplitude adjustment value and convert the current transmit power into a second amplitude adjustment value;
an adjusting subunit, configured to perform amplitude adjustment on the reference signal portion of the uplink signal by using the first amplitude adjustment value, and perform amplitude adjustment on the data signal portion of the uplink signal by using the second amplitude adjustment value; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
A fourth aspect of the present application provides an apparatus for uplink timing synchronization, including:
the first power calculation unit is used for calculating the current transmitting power of the physical uplink control channel before sending an uplink signal to a gateway station through the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
the second power calculation unit is used for calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power and meets channel estimation requirements;
a power adjusting unit, configured to use the current transmit power as a transmit power of a data signal portion of the uplink signal, and use the first transmit power as a transmit power of a reference signal portion of the uplink signal;
a sending unit, configured to send the uplink signal to the gateway station through the physical uplink control channel;
a receiving unit, configured to receive a time adjustment command issued by the gateway station; the time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station;
and the time adjusting unit is used for adjusting the uplink sending time according to the time adjusting command.
Optionally, in the uplink timing synchronization apparatus provided above, the second power calculating unit includes:
the arithmetic unit is used for calculating the sum of the current transmitting power and a reference signal power offset value to obtain the arithmetic transmitting power; the reference signal power offset value is the difference value of the transmission power of a reference signal part and a data signal part configured in a communication protocol;
a power determining unit, configured to determine, as the first transmit power, a smaller value of the calculated transmit power and the current maximum output power by comparing a magnitude relationship between the calculated transmit power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
Optionally, in the uplink timing synchronization apparatus provided above, the power adjusting unit includes:
a power conversion unit, configured to convert the first transmit power into a first amplitude adjustment value and convert the current transmit power into a second amplitude adjustment value;
a power adjustment subunit, configured to perform amplitude adjustment on a reference signal portion of the uplink signal generated by the physical layer by using the first amplitude adjustment value, and perform amplitude adjustment on a data signal portion of the uplink signal generated by the physical layer by using the second amplitude adjustment value;
the sending unit is configured to send the uplink signal subjected to amplitude adjustment to the gateway station through the physical uplink control channel; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
A fifth aspect of the present application provides a control apparatus comprising:
one or more processors;
a memory having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a method of power control for a channel as recited in any of the above.
A sixth aspect of the present application provides a terminal, comprising:
a communication component; one or more processors; a memory having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
before sending an uplink signal to a gateway station through a physical uplink control channel, calculating to obtain the current transmitting power of the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power and meets channel estimation requirements;
using the current transmission power as the transmission power of the data signal part of the uplink signal, using the first transmission power as the transmission power of the reference signal part of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel by the communication component;
receiving a time adjustment command issued by the gateway station through the communication assembly; the time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station;
and adjusting the uplink sending time according to the time adjusting command.
Optionally, in the above terminal, when the one or more processors calculate the first transmit power by using the current transmit power, the one or more processors are configured to:
calculating the sum of the current transmitting power and a reference signal power offset value to obtain an operation transmitting power; the reference signal power offset value is the difference value of the transmission power of a reference signal part and a data signal part configured in a communication protocol;
determining the smaller value of the operation transmitting power and the current maximum output power as the first transmitting power by comparing the magnitude relation between the operation transmitting power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
Optionally, in the above terminal, when the one or more processors execute to use the current transmission power as the transmission power of the data signal portion of the uplink signal, and use the first transmission power as the transmission power of the reference signal portion of the uplink signal, the one or more processors are configured to:
converting the first transmission power into a first amplitude adjustment value and converting the current transmission power into a second amplitude adjustment value;
carrying out amplitude adjustment on a reference signal part of the uplink signal generated by the physical layer by using the first amplitude adjustment value, and carrying out amplitude adjustment on a data signal part of the uplink signal generated by the physical layer by using the second amplitude adjustment value;
the communication component sends the uplink signal subjected to amplitude adjustment to the gateway station through the physical uplink control channel; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
A sixth aspect of the present application provides a computer readable medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method for power control of a channel as in any of the above, or the method for uplink timing synchronization as in any of the above.
According to the channel power control method, before an uplink signal is sent through a physical uplink control channel, the current transmitting power of the physical uplink control channel is obtained through calculation, and then the first transmitting power larger than the current transmitting power value is obtained through calculation on the basis of the current transmitting power. And finally, taking the current transmitting power as the transmitting power of the data signal part in the uplink signal, taking the first transmitting power as the transmitting power of the reference signal part of the uplink signal, and transmitting the uplink signal to the gateway station through the physical uplink control channel, so that the transmitting power of the reference signal part in the uplink signal transmitted to the gateway station through the physical uplink control channel is improved, the signal-to-noise ratio of the reference signal is improved, and the estimated accurate time deviation value can be effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for controlling power of a channel according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for calculating a first transmit power according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a method for adjusting transmission power according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a method for uplink timing synchronization according to another embodiment of the present application;
fig. 5 is a flowchart illustrating a method for calculating a first transmit power according to another embodiment of the present disclosure;
fig. 6 is a flowchart illustrating a method for adjusting transmission power according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a power control apparatus for a channel according to another embodiment of the present application;
fig. 8 is a schematic structural diagram of a second computing unit according to another embodiment of the present application;
fig. 9 is a schematic structural diagram of an adjusting unit according to another embodiment of the present application;
fig. 10 is a schematic structural diagram of an uplink timing synchronization apparatus according to another embodiment of the present application;
fig. 11 is a schematic structural diagram of a control device according to another embodiment of the present application;
fig. 12 is a schematic structural diagram of a terminal according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The transmission power adopted by the terminal in transmitting signals to the gateway station affects the signal-to-noise ratio of the signals, and the signals with lower signal-to-noise ratio cause that the result obtained by utilizing the signals to perform subsequent calculation is easy to generate larger errors. However, increasing the transmission power increases the power consumption of the terminal, so that the transmission power cannot be increased to a higher value simply, and thus the embodiment of the present application provides a method for controlling the power of a channel, as shown in fig. 1, where the method specifically includes the following steps:
s101, calculating to obtain the current transmitting power of the physical uplink control channel before sending the uplink signal through the physical uplink control channel.
The uplink signal transmitted by the terminal through the physical uplink control channel includes a data signal part and a reference signal part. The data signal part specifically refers to uplink control information for implementing control, such as an acknowledgement signal (ACK/NACK), a Channel Quality Indicator (CQI), a Rank Indicator (RI), and the like, which occupies most of the uplink signal and is a main part of the uplink signal. However, the reference signal part which occupies a relatively small part in the uplink signal is used for estimating the uplink time offset value or channel estimation, channel response and frequency offset value, and specifically may include a demodulation reference signal DMRS.
It should be noted that, when the uplink signal is determined through the physical uplink control channel in the communication protocol, a calculation formula of the transmission power of the uplink signal is adopted. In the prior art, when a terminal transmits an uplink signal through a physical uplink control channel, the terminal directly transmits the uplink signal to a gateway station according to transmission power calculated by a transmission power calculation formula of the physical uplink control channel. In this application, the current transmission power of the physical uplink control channel is also calculated by using the transmission power calculation formula of the physical uplink control channel determined in the communication protocol.
Specifically, the calculation formula of the transmission power of the physical uplink control channel is as follows:
namely, it is
Calculated power and PCMAX(i) The minimum value of (3) is used as the current transmission power. Wherein, PPUCCH(i) Is the current transmit power; pCMAX(i) Maximum output power configured for the terminal defined at the current transmission occasion i for the current serving cell in the communication protocol; pO_PUCCHIs composed of component parameters PO_NOMINAL_PUCCHSum of (2) and component parameter PO_UE_PUCCHComposition of the resulting parameters, PO_UE_PUCCHAnd PO_NOMINAL_PUCCHAre provided by higher layer parameters in the communication protocol.
A resource block number representation of PUCCH transmission occasion i on active UL BWPb for the serving cell; PL is a downlink path loss estimation value; deltaF_PUCCH(F) Δ parameter provided by the higher layer parameter deltaF-PUCCH-f0 for PUCCH format 0 or deltaF-PUCCH-f1 for PUCCH format 1TF,b,c(i) Is the transmission power adjustment parameter at transmission occasion i, and g (i) is the power control value of the PUCCH at the current transmission occasion i.
Specifically, according to the cell where the terminal is currently located and the transmission opportunity, each parameter in the transmission power calculation formula is determined, and then each parameter is substituted into the formula to calculate and obtain the current transmission power of the physical uplink control channel.
S102, calculating to obtain first transmitting power by using the current transmitting power, wherein the first transmitting power is larger than the current transmitting power.
Because the current transmission power of the physical uplink control channel obtained by calculation is smaller by using the transmission power calculation formula of the physical uplink control channel, a first transmission power larger than the current transmission power needs to be obtained by calculation on the basis of the current transmission power obtained by calculation. Specifically, a preset power value may be increased based on the current transmission power, so as to obtain the first transmission power. Or, according to different conditions of the serving cell in which the terminal is located, the first transmit power and the like which meet the current serving cell can be obtained by correspondingly calculating by using the current transmit power.
Optionally, a specific implementation manner of step S102, as shown in fig. 2, includes:
s201, calculating the sum of the current transmitting power and the reference signal power offset value to obtain the calculation transmitting power.
Wherein the reference signal power offset value is a difference value of transmission power of the reference signal part and the data signal part configured in the communication protocol. Specifically, a field of a reference signal power offset value for the PUCCH in format 1 may be added to a PUCCH power Control parameter in Radio Resource Control (RRC) configuration information, and a reference power offset value may be configured in the field.
S202, by comparing the magnitude relation between the operation transmitting power and the current maximum output power, determining the smaller value of the operation transmitting power and the current maximum output power as the first transmitting power.
Wherein, the current maximum output power is the maximum output power of the terminal defined on the current transmission opportunity for the current serving cell in the communication protocol, that is, P in the transmit power calculation formula of the physical uplink control channelCMAX(i)。
Therefore, the calculation method for calculating the first transmission power in the embodiment of the present application may be expressed as: pPUCCH_DMRS(i)＝min{PCMAX(i),PPUCCH(i)+PDMRSOffset}; wherein, PDMRSOffsetIs a reference signal power offset value. It can be seen that the first transmit power calculated by the formula is necessarily larger than the current transmit power. In the normal case, PCMAX(i) Far higher than the current transmission power PPUCCH(i) Large, so that the first transmit power is generally equal to the current transmit power and the reference signalThe sum of the sign power offset values.
S103, taking the current transmission power as the transmission power of the data signal part of the uplink signal, and taking the first transmission power as the transmission power of the reference signal part of the uplink signal.
Because the reference signal part in the uplink signal is used for realizing the functions of estimating the uplink time offset value or channel estimation and the like, the transmission power of the reference signal part of the uplink signal is only raised in the embodiment of the application, and the data signal part of the uplink signal still adopts the calculated current transmission power. Moreover, since the ratio of the reference signal part in the uplink signal is relatively small, the accuracy of a result obtained by performing subsequent calculation by using the uplink signal can be ensured under the condition of avoiding excessive increase of the power consumption of the terminal, that is, the accuracy of parameters such as a time offset value, a frequency offset value, a channel response, signal power, noise power, a signal-to-noise power ratio and the like of the uplink channel estimation obtained based on the uplink signal can be ensured.
Optionally, a specific implementation manner of step S103, as shown in fig. 3, includes the following steps:
s301, converting the first transmission power into a first amplitude adjustment value and converting the current transmission power into a second amplitude adjustment value.
Specifically, in the prior art, the amplitude of the uplink signal may be adjusted by calculating an amplitude adjustment value corresponding to the current power, so that the uplink signal is transmitted to the gateway station with the corresponding transmission power. Therefore, in the embodiment of the present application, the adjustment of the transmission power is also realized through the amplitude adjustment value, and therefore, the first transmission power needs to be converted into the first amplitude adjustment value and the current transmission power needs to be converted into the second amplitude adjustment value.
S302, amplitude adjustment is carried out on the reference signal part of the uplink signal by utilizing the first amplitude adjustment value, and amplitude adjustment is carried out on the data signal part of the uplink signal by utilizing the second amplitude adjustment value.
The transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power. Therefore, after the uplink signal is adjusted by the first amplitude adjustment value and the second amplitude adjustment value, the transmission power of the reference signal portion of the transmitted uplink signal is the first transmission power, and the transmission power of the data signal portion of the transmitted uplink signal is the current transmission power.
Since uplink timing synchronization is realized by sending a channel Sounding Reference Signal (SRS), the terminal and the gateway station need to develop aiming at the SRS characteristic, which not only increases the development cost, occupies the time-frequency resource for carrying information of the system, but also increases the complexity of Signal processing of the terminal and the gateway station. In addition, since the SRS function in the satellite communication system can be realized by a Physical Uplink Control Channel (PUCCH) of the system, in the satellite communication field, Uplink timing synchronization is generally realized by the PUCCH. The problem of transmit power is related to the implementation of uplink timing synchronization through PUCCH, so the power control method for a channel provided in the above embodiments may be applied to an application scenario in which uplink timing synchronization is implemented through PUCCH. Therefore, based on the power control method of the channel provided in the foregoing embodiment, a method for uplink timing synchronization provided in another embodiment of the present application, as shown in fig. 4, specifically includes the following steps:
s401, before sending the uplink signal to the gateway station through the physical uplink control channel, calculating to obtain the current transmitting power of the physical uplink control channel.
The uplink signal includes a data signal portion and a reference signal portion. The reference signal portion is used to estimate the time offset value.
It should be noted that, in the specific implementation of step S401, reference may be made to step S101 in the foregoing embodiment, and details are not described here.
Alternatively, in order to implement uplink timing synchronization, the terminal needs to transmit an uplink signal to the gateway station for the gateway station to estimate a time offset and maintain uplink timing synchronization, usually at most every 10 milliseconds. Therefore, the transmission period of format 1 configuring the terminal PUCCH in the communication protocol is less than or equal to 10 milliseconds. Therefore, the method provided by the embodiment of the application is executed once every configured transmission period.
S402, calculating by using the current transmitting power to obtain a first transmitting power, wherein the first transmitting power is greater than the current transmitting power and meets the channel estimation requirement.
The embodiments of the present application mainly aim to implement uplink timing synchronization, so that the first transmit power meets channel estimation requirements, and can meet estimation requirements of a time offset value.
It should be noted that the specific calculation process of step S402 may be the same as the calculation process of step S102, so the specific calculation process of step S402 may be referred to accordingly. The difference is that in the embodiment of the present application, uplink timing synchronization needs to be performed, so that there is a requirement for the signal-to-noise ratio of the reference signal portion, and the signal-to-noise ratio of the reference signal portion is too low, which may cause the estimated time offset value to be inaccurate, so that the first transmit power is not only greater than the current transmit power, but also needs to meet the estimation requirement of the time offset value, that is, the first transmit power may enable the signal-to-noise ratio of the reference signal to meet the requirement of accurately estimating the time offset value.
Optionally, a specific implementation manner of step S402, as shown in fig. 5, includes the following steps:
s501, calculating the sum of the current transmitting power and the reference signal power offset value to obtain the calculation transmitting power.
Wherein the reference signal power offset value is a difference value of transmission power of the reference signal part and the data signal part configured in the communication protocol.
S502, by comparing the magnitude relation between the operation transmitting power and the current maximum output power, the smaller value of the operation transmitting power and the current maximum output power is determined as the first transmitting power.
Wherein the current maximum output power is the maximum output power of the terminal defined on the current transmission opportunity for the current serving cell in the communication protocol.
It should be noted that, the specific implementation of steps S501 and S502 may refer to step 201 and step S202 in the above embodiment accordingly. The difference is that the configured reference signal power offset value needs to be such that the calculated first transmit power meets the requirements of the estimated time offset value.
S403, using the current transmission power as the transmission power of the data signal part of the uplink signal, using the first transmission power as the transmission power of the reference signal part of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel.
That is, when the uplink signal is transmitted to the gateway station through the physical uplink control channel, the transmission power of the reference signal portion of the uplink signal is the first raised transmission power, and the transmission power of the data signal portion of the uplink signal is the current transmission power obtained by calculation.
Optionally, a specific implementation manner of step S404, as shown in fig. 6, specifically includes:
s601, converting the first transmission power into a first amplitude adjustment value and converting the current transmission power into a second amplitude adjustment value.
S602, performing amplitude adjustment on a reference signal part of an uplink signal generated by a physical layer by using a first amplitude adjustment value, and performing amplitude adjustment on a data signal part of the uplink signal generated by the physical layer by using a second amplitude adjustment value.
It should be noted that, the specific implementation of step S601 and step S602 may refer to step S301 and step S304 in the above embodiment accordingly.
And S603, sending the uplink signal subjected to amplitude adjustment to a gateway station through a physical uplink control channel.
The transmission power of the reference signal part after amplitude adjustment is the first transmission power, and the transmission power of the data signal part after amplitude adjustment is the current transmission power.
S404, receiving a time adjustment command sent by the gateway station.
And the time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station. Specifically, after receiving the uplink signal, the gateway station demodulates the uplink signal by its physical layer to obtain an estimated time offset value, and then uploads the time offset value to a higher layer of the gateway station, that is, to a Media Access Control (MAC) layer for processing, so as to obtain a Timing Advance Command (TAC), and finally issues the TAC Command to the terminal.
And S405, adjusting the uplink sending time according to the time adjusting command.
Specifically, since signals need to be sent in advance to achieve uplink timing synchronization, the terminal subtracts the time offset value from the original uplink sending time to obtain the adjusted time, and sends the signals when the adjusted time is reached, thereby achieving uplink timing synchronization.
In the uplink timing synchronization method provided in the embodiment of the present application, before sending an uplink signal to a gateway station through a physical uplink control channel, a transmit power calculation formula of the physical uplink control channel is first used to calculate a current transmit power of the physical uplink control channel, and then a first transmit power greater than a current transmit power value is calculated on the basis of the current transmit power. And finally, taking the current transmission power as the transmission power of the data signal part in the uplink signal, taking the first transmission power as the transmission power of the reference signal part of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel, so that the transmission power of the reference signal part in the uplink signal sent to the gateway station through the physical uplink control channel is improved, the gateway station can accurately estimate the time offset value according to the reference signal transmitted with high power, and the terminal cannot be subjected to too large power consumption. It should be noted that, although the embodiment of the present application mainly controls the power of the uplink signal in order to achieve uplink timing synchronization, the accuracy of each parameter such as a frequency offset value and a channel response determined based on the uplink signal is also improved due to the increase of the transmission power of the reference signal portion.
Another embodiment of the present application provides a power control apparatus for a channel, as shown in fig. 7, including:
a first calculating unit 701, configured to calculate a current transmit power of a physical uplink control channel before sending an uplink signal through the physical uplink control channel.
The uplink signal includes a data signal portion and a reference signal portion. Specifically, the transmit power may be calculated by using a transmit power calculation formula of the physical uplink control channel.
A second calculating unit 702, configured to calculate the first transmit power by using the current transmit power.
Wherein the first transmission power is greater than the current transmission power.
The adjusting unit 703 is configured to use the current transmission power as the transmission power of the data signal portion of the uplink signal, and use the first transmission power as the transmission power of the reference signal portion of the uplink signal.
Optionally, in the power control apparatus for a channel according to another embodiment of the present application, the second calculating unit 702, as shown in fig. 8, includes: a second calculation subunit 801 and a determination unit 802.
And a second calculating subunit 801, configured to calculate a sum of the current transmit power and the reference signal power offset value, so as to obtain an operation transmit power.
Wherein the reference signal power offset value is a difference value of transmission power of the reference signal part and the data signal part configured in the communication protocol.
The determining unit 802 is configured to determine, as the first transmit power, a smaller value of the calculated transmit power and the current maximum output power by comparing a magnitude relationship between the calculated transmit power and the current maximum output power.
Wherein the current maximum output power is the maximum output power of the terminal defined on the current transmission opportunity for the current serving cell in the communication protocol.
Optionally, an adjusting unit in the power control apparatus for a channel provided in another embodiment of the present application is shown in fig. 9, and includes:
a scaling unit 901, configured to scale the first transmit power to a first amplitude adjustment value and scale the current transmit power to a second amplitude adjustment value.
An adjusting subunit 902, configured to perform amplitude adjustment on the reference signal portion of the uplink signal by using the first amplitude adjustment value, and perform amplitude adjustment on the data signal portion of the uplink signal by using the second amplitude adjustment value.
The transmission power of the reference signal part after amplitude adjustment is the first transmission power, and the transmission power of the data signal part after amplitude adjustment is the current transmission power.
It should be noted that, for the specific working process of each unit of the power control apparatus for a channel provided in the foregoing embodiment, reference may be made to the implementation of the power control method for a channel provided in any of the foregoing embodiments, and details are not described here again.
Another embodiment of the present application provides an apparatus for uplink timing synchronization, as shown in fig. 10, including:
a first power calculation unit 1001, configured to calculate a current transmit power of a physical uplink control channel before sending an uplink signal to a gateway station through the physical uplink control channel; the uplink signal includes a data signal portion and a reference signal portion.
A second power calculating unit 1002, configured to calculate the first transmit power by using the current transmit power.
And the first transmission power is greater than the current transmission power and meets the channel estimation requirement.
A power adjusting unit 1003, configured to use the current transmit power as a transmit power of a data signal portion of the uplink signal, and use the first transmit power as a transmit power of a reference signal portion of the uplink signal.
A sending unit 1004, configured to send the uplink signal to the gateway station through a physical uplink control channel.
A receiving unit 1005, configured to receive a time adjustment command issued by a gateway station.
The time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station.
A time adjusting unit 1006, configured to adjust the uplink sending time according to the time adjusting command.
Optionally, the second power calculating unit in the apparatus for uplink timing synchronization provided in another embodiment of the present application includes: an arithmetic unit and a power determination unit.
The operation unit is used for calculating the sum of the current transmitting power and the reference signal power offset value to obtain the operation transmitting power; the reference signal power offset value is the difference in transmit power of the reference signal portion and the data signal portion configured in the communication protocol.
The power determining unit is used for determining the smaller value of the calculated transmitting power and the current maximum output power as the first transmitting power by comparing the magnitude relation between the calculated transmitting power and the current maximum output power.
Wherein the current maximum output power is the maximum output power of the terminal defined on the current transmission opportunity for the current serving cell in the communication protocol.
Optionally, a power adjustment unit in the uplink timing synchronization apparatus provided in another embodiment of the present application includes: a power scaling unit and a transmission power adjusting unit.
The power conversion unit is used for converting the first transmitting power into a first amplitude adjustment value and converting the current transmitting power into a second amplitude adjustment value.
The transmission power adjusting unit is used for adjusting the amplitude of the reference signal part of the uplink signal generated by the physical layer by using a first amplitude adjusting value and adjusting the amplitude of the data signal part of the uplink signal generated by the physical layer by using a second amplitude adjusting value.
The sending unit 1004 is configured to send the uplink signal with the adjusted amplitude to the gateway station through a physical uplink control channel. The transmission power of the reference signal part after amplitude adjustment is the first transmission power, and the transmission power of the data signal part after amplitude adjustment is the current transmission power.
It should be noted that, for the specific working process of each unit of the apparatus for uplink timing synchronization provided in the foregoing embodiment, reference may be made to the implementation of the method for uplink timing synchronization provided in any of the foregoing embodiments, and details are not described here.
Another embodiment of the present application provides a control apparatus, as shown in fig. 11, including:
one or more processors 1101.
A memory 1102 having one or more programs stored thereon.
The one or more programs, when executed by the one or more processors 1101, cause the one or more processors to implement the method of power control of a channel as in any one of the embodiments described above.
Another embodiment of the present application provides a terminal, as shown in fig. 12, including:
a communications component 1201, one or more processors 1202; a memory 1203 on which one or more programs are stored.
When the one or more programs in the memory 1203 are executed by the one or more processors 1202, the one or more processors may implement the method for uplink timing synchronization provided in any of the above embodiments, specifically, the following operations are implemented:
before sending uplink signals to the gateway station through the physical uplink control channel, calculating to obtain the current transmitting power of the physical uplink control channel.
The uplink signal includes a data signal portion and a reference signal portion.
And calculating to obtain the first transmission power by using the current transmission power. And the first transmission power is greater than the current transmission power and meets the channel estimation requirement.
And taking the current transmission power as the transmission power of the data signal part of the uplink signal, taking the first transmission power as the transmission power of the reference signal part of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel by the communication assembly.
And receiving a time adjustment command transmitted by the gateway station through the communication component.
The time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station.
And adjusting the uplink sending time according to the time adjusting command.
Optionally, in another embodiment of the present application, when the one or more processors of the terminal calculate the first transmit power by using the current transmit power, the one or more processors are configured to:
calculating the sum of the current transmitting power and the reference signal power offset value to obtain the calculation transmitting power; the reference signal power offset value is the difference in transmit power of the reference signal portion and the data signal portion configured in the communication protocol.
Determining the smaller value of the calculated transmitting power and the current maximum output power as a first transmitting power by comparing the magnitude relation between the calculated transmitting power and the current maximum output power; wherein the current maximum output power is the maximum output power of the terminal defined on the current transmission opportunity for the current serving cell in the communication protocol.
Optionally, in another embodiment of the present application, when the current transmission power is used as the transmission power of the data signal portion of the uplink signal and the first transmission power is used as the transmission power of the reference signal portion of the uplink signal, the one or more processors of the terminal are configured to:
the first transmit power is scaled to a first amplitude adjustment value and the current transmit power is scaled to a second amplitude adjustment value.
And performing amplitude adjustment on the reference signal part of the uplink signal generated by the physical layer by using the first amplitude adjustment value, and performing amplitude adjustment on the data signal part of the uplink signal generated by the physical layer by using the second amplitude adjustment value.
And the communication assembly sends the uplink signal subjected to amplitude adjustment to the gateway station through a physical uplink control channel. The transmission power of the reference signal part after amplitude adjustment is the first transmission power, and the transmission power of the data signal part after amplitude adjustment is the current transmission power.
Another embodiment of the present application provides a computer readable medium, on which a computer program is stored, wherein the program is executed by a processor to implement the method for power control of a channel as provided in any of the above embodiments, or the method for uplink timing synchronization as provided in any of the above embodiments.
Alternatively, the storage medium may be a non-transitory computer readable storage medium, for example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A method for power control of a channel, comprising:
calculating to obtain the current transmitting power of a physical uplink control channel before sending an uplink signal through the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power;
and taking the current transmission power as the transmission power of the data signal part of the uplink signal, and taking the first transmission power as the transmission power of the reference signal part of the uplink signal.
2. The method of claim 1, wherein calculating the first transmit power using the current transmit power comprises:
calculating the sum of the current transmitting power and a reference signal power offset value to obtain an operation transmitting power; wherein the reference signal power offset value is a difference value of transmission power of a reference signal part and a data signal part configured in a communication protocol;
determining the smaller value of the operation transmitting power and the current maximum output power as the first transmitting power by comparing the magnitude relation between the operation transmitting power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
3. The method of claim 1, wherein the using the current transmission power as the transmission power of the data signal portion of the uplink signal and the first transmission power as the transmission power of the reference signal portion of the uplink signal comprises:
converting the first transmission power into a first amplitude adjustment value and converting the current transmission power into a second amplitude adjustment value;
carrying out amplitude adjustment on a reference signal part of the uplink signal by using the first amplitude adjustment value, and carrying out amplitude adjustment on a data signal part of the uplink signal by using the second amplitude adjustment value; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
4. A method for uplink timing synchronization, comprising:
before sending an uplink signal to a gateway station through a physical uplink control channel, calculating to obtain the current transmitting power of the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power and meets channel estimation requirements;
using the current transmission power as the transmission power of the data signal part of the uplink signal, using the first transmission power as the transmission power of the reference signal part of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel;
receiving a time adjustment command issued by the gateway station; the time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station;
and adjusting the uplink sending time according to the time adjusting command.
5. The method of claim 4, wherein said calculating a first transmit power using said current transmit power comprises:
calculating the sum of the current transmitting power and a reference signal power offset value to obtain an operation transmitting power; the reference signal power offset value is the difference value of the transmission power of a reference signal part and a data signal part configured in a communication protocol;
determining the smaller value of the operation transmitting power and the current maximum output power as the first transmitting power by comparing the magnitude relation between the operation transmitting power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
6. The method of claim 4, wherein the using the current transmission power as the transmission power of the data signal portion of the uplink signal and the first transmission power as the transmission power of the reference signal portion of the uplink signal, and sending the uplink signal to the gateway station through the physical uplink control channel comprises:
converting the first transmission power into a first amplitude adjustment value and converting the current transmission power into a second amplitude adjustment value;
carrying out amplitude adjustment on a reference signal part of the uplink signal generated by the physical layer by using the first amplitude adjustment value, and carrying out amplitude adjustment on a data signal part of the uplink signal generated by the physical layer by using the second amplitude adjustment value;
sending the uplink signal subjected to amplitude adjustment to the gateway station through the physical uplink control channel; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
7. An apparatus for controlling power of a channel, comprising:
the first calculation unit is used for calculating the current transmitting power of the physical uplink control channel before the uplink signal is sent through the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
the second calculation unit is used for calculating to obtain first transmission power by using the current transmission power; wherein the first transmit power is greater than the current transmit power;
and the adjusting unit is used for taking the current transmission power as the transmission power of the data signal part of the uplink signal and taking the first transmission power as the transmission power of the reference signal part of the uplink signal.
8. The apparatus of claim 7, wherein the second computing unit comprises:
the second calculating subunit is used for calculating the sum of the current transmitting power and the reference signal power offset value to obtain the calculated transmitting power; wherein the reference signal power offset value is a difference value of transmission power of a reference signal part and a data signal part configured in a communication protocol;
a determining unit, configured to determine, as the first transmit power, a smaller value of the operational transmit power and the current maximum output power by comparing a magnitude relationship between the operational transmit power and the current maximum output power; wherein the current maximum output power is a maximum output power of the terminal defined on a current transmission opportunity for a current serving cell in a communication protocol.
9. The apparatus of claim 7, wherein the adjusting unit comprises:
a conversion unit, configured to convert the first transmit power into a first amplitude adjustment value and convert the current transmit power into a second amplitude adjustment value;
an adjusting subunit, configured to perform amplitude adjustment on the reference signal portion of the uplink signal by using the first amplitude adjustment value, and perform amplitude adjustment on the data signal portion of the uplink signal by using the second amplitude adjustment value; the transmission power of the reference signal part after the amplitude adjustment is the first transmission power, and the transmission power of the data signal part after the amplitude adjustment is the current transmission power.
10. An apparatus for uplink timing synchronization, comprising:
the first power calculation unit is used for calculating the current transmitting power of the physical uplink control channel before sending an uplink signal to a gateway station through the physical uplink control channel; wherein the uplink signal comprises a data signal portion and a reference signal portion;
the second power calculation unit is used for calculating to obtain first transmitting power by using the current transmitting power; wherein the first transmit power is greater than the current transmit power and meets channel estimation requirements;
a power adjusting unit, configured to use the current transmit power as a transmit power of a data signal portion of the uplink signal, and use the first transmit power as a transmit power of a reference signal portion of the uplink signal;
a sending unit, configured to send the uplink signal to the gateway station through the physical uplink control channel;
a receiving unit, configured to receive a time adjustment command issued by the gateway station; the time adjustment command is obtained by processing a time offset value estimated according to the uplink signal by the gateway station;
and the time adjusting unit is used for adjusting the uplink sending time according to the time adjusting command.
11. A control device, comprising:
one or more processors;
a memory having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of claims 1-3.
12. A terminal, comprising:
a communication component; one or more processors; a memory having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of claims 4 to 6;
wherein: and the one or more processors send uplink signals to the gateway station through the communication assembly through a physical uplink control channel, and receive a time adjustment command sent by the gateway station through the communication assembly.
13. A computer-readable medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method of any one of claims 1 to 3, or the method of any one of claims 4 to 6.
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| CN114884538A (en) * | 2022-07-11 | 2022-08-09 | 四川创智联恒科技有限公司 | Time offset estimation method and system for NR uplink control channel |
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