CN113939005A - Downlink synchronization method, user equipment, electronic equipment and computer storage medium - Google Patents
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Abstract
The embodiment of the disclosure relates to the technical field of wireless communication, and discloses a downlink synchronization method, user equipment, electronic equipment and a computer storage medium, wherein the downlink synchronization method comprises the following steps: receiving indication information sent by the gateway station, wherein the indication information is used for indicating the timing deviation of the gateway station, and the timing deviation is obtained by the gateway station according to a downlink synchronous signal sent by a satellite; then, the satellite is synchronized with the downlink with reference to the timing offset. According to the method, the synchronization range of the downlink synchronization can be quickly locked according to the accurate timing deviation between the gateway station and the satellite, the speed, the efficiency and the accuracy of the downlink synchronization between the user equipment and the satellite can be greatly improved, and the time consumption and the power consumption of the downlink synchronization between the user equipment and the satellite can be greatly reduced.
Description
Technical Field
The disclosed embodiments relate to the technical field of wireless communication, and in particular, to a downlink synchronization method, user equipment, electronic equipment, and a computer storage medium.
Background
The satellite mobile communication system has the characteristics of flexible networking, wide coverage area, no influence of natural disasters and the like, is continuously developed in recent years, and the satellite and the ground mobile communication system are mutually fused to jointly form a world-ground integrated communication network with global seamless coverage, so that the satellite-ground integrated communication network meets various ubiquitous business requirements of users, and is an important direction for future communication development.
Currently, satellite communication is considered to be an important complement to 5G, and an important content to 6G. In the 5G standard of 3GPP (3rd Generation Partnership Project) organization, a deployment scenario facing a Non-terrestrial network (NTN) including satellites is well defined. However, satellite communication, as a supplement to 5G and an important part of 6G systems, also faces many challenges, such as power consumption, frequency, doppler shift, and timing. Since the propagation delay of a signal is naturally very large when a satellite is far from the ground (the low-earth satellite is about 600km away from the ground), the delay is quite large compared with a ground base station, and in addition, the doppler frequency offset greatly increases the complexity of timing estimation of a User Equipment (UE), which increases the cost of the UE. Therefore, simplifying the complexity of timing estimation of the UE is an important research direction.
Disclosure of Invention
The purpose of the disclosed embodiment is to solve at least one of the above technical defects, and to provide the following technical solutions:
in one aspect, a downlink synchronization method is provided, including:
receiving indication information sent by a gateway station, wherein the indication information is used for indicating the timing deviation between the gateway station and a satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite;
and performing downlink synchronization with the satellite by referring to the timing deviation.
In a possible implementation manner, before receiving the indication information sent by the gateway station, the method further includes:
receiving a ground synchronous signal sent by a gateway station;
and synchronizing with the gateway station according to the ground synchronizing signal.
In one possible implementation, the ground synchronization signal and/or the indication information is received by receiving a synchronization channel transmitted by the gateway station.
In one possible implementation, the reference timing offset, downlink synchronization with the satellite, includes:
determining the distance between the user equipment and the gateway station according to the ground synchronous signal;
and performing downlink synchronization with the satellite according to the timing deviation and the distance.
In one possible implementation, performing downlink synchronization with a satellite according to timing offset and distance includes:
when the distance is determined to be smaller than or equal to the preset distance threshold, directly utilizing the timing deviation to perform downlink synchronization with the satellite;
and when the distance is determined to be larger than the preset distance threshold value, determining a timing deviation compensation value needing to be compensated based on the distance, and performing downlink synchronization with the satellite according to the sum of the timing deviation and the timing deviation compensation value.
In one possible implementation, the receiving gateway station transmits a synchronization channel at a predetermined frequency, which is a sideband frequency of the satellite's transmission frequency.
In one aspect, a downlink synchronization method is provided, including:
and sending indication information to the user equipment, wherein the indication information is used for indicating the timing deviation between the gateway station and the satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite and is used for synchronizing the user equipment with the satellite.
In a possible implementation manner, before sending the indication information to the user equipment, the method further includes:
and sending a ground synchronization signal to the user equipment so that the user equipment synchronizes with the gateway station according to the ground synchronization signal.
In one possible implementation, the terrestrial synchronization signal and/or the indication information is transmitted by transmitting a synchronization channel to the user equipment.
In one possible implementation, the synchronization channel is transmitted to the user equipment at a predetermined frequency, which is a sideband frequency of the transmission frequency of the satellite.
In one aspect, a user equipment is provided, including:
the receiving module is configured to receive indication information sent by the gateway station, wherein the indication information is used for indicating a timing deviation between the gateway station and the satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite;
the synchronization module is configured to perform downlink synchronization with the satellite with reference to the timing offset.
In one possible implementation, the receiving module is further configured to:
receiving a ground synchronous signal sent by a gateway station;
and synchronizing with the gateway station according to the ground synchronizing signal.
In one possible implementation, the receiving module is configured to receive the ground synchronization signal and/or the indication information by receiving a synchronization channel transmitted by the gateway station.
In one possible implementation, the synchronization module is configured to:
determining the distance between the user equipment and the gateway station according to the ground synchronous signal;
and performing downlink synchronization with the satellite according to the timing deviation and the distance.
In one possible implementation, the synchronization module, when performing downlink synchronization with the satellite according to the timing offset and the distance, is configured to:
when the distance is determined to be smaller than or equal to the preset distance threshold, directly utilizing the timing deviation to perform downlink synchronization with the satellite;
and when the distance is determined to be larger than the preset distance threshold value, determining a timing deviation compensation value needing to be compensated based on the distance, and performing downlink synchronization with the satellite according to the sum of the timing deviation and the timing deviation compensation value.
In one possible implementation, the receiving module is configured to receive a synchronization channel transmitted by the gateway station at a predetermined frequency, the predetermined frequency being a sideband frequency of the transmission frequency of the satellite.
In one aspect, there is provided a gateway station apparatus comprising:
the transmitting module is configured to transmit indication information to the user equipment, the indication information indicating a timing offset between the gateway station and the satellite, the timing offset being obtained by the gateway station according to a downlink synchronization signal transmitted by the satellite, for synchronizing the user equipment with the satellite.
In one possible implementation, the transmitting module is further configured to transmit a terrestrial synchronization signal to the user equipment, so that the user equipment synchronizes with the gateway station according to the terrestrial synchronization signal.
In one possible implementation, the transmitting module is configured to transmit the terrestrial synchronization signal and/or the indication information by transmitting a synchronization channel to the user equipment.
In one possible implementation, the transmitting module is configured to transmit the synchronization channel to the user equipment at a predetermined frequency, the predetermined frequency being a sideband frequency of a transmission frequency of the satellite.
In one aspect, an electronic device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the synchronization method is implemented.
In one aspect, a computer-readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the synchronization method described above.
The synchronization method provided by the embodiment of the disclosure can quickly perform downlink synchronization with the satellite by referring to the received timing deviation between the gateway station and the satellite, so that the user equipment can quickly lock the synchronization range of the downlink synchronization according to the accurate timing deviation between the gateway station and the satellite under the condition of initial synchronization, thereby not only greatly improving the speed, efficiency and accuracy of completing the downlink synchronization between the user equipment and the satellite, and greatly shortening the synchronization time between the user equipment and the satellite, but also greatly reducing the power consumption of performing the downlink synchronization between the user equipment and the satellite.
Additional aspects and advantages of embodiments of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the embodiments of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a downlink synchronization method according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating an interaction process between a user equipment, a gateway station, and a satellite according to an embodiment of the disclosure;
fig. 4 is a flowchart illustrating a downlink synchronization method according to another embodiment of the disclosure;
fig. 5 is a schematic diagram of a basic structure of a user equipment according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a basic structure of a gateway station apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of illustrating the present disclosure and should not be construed as limiting the same.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
Currently, according to some research results of 3GPP, there are 2 main categories of methods for simplifying the timing complexity of UE:
first, UE computation with known satellite positions;
the method comprises the following steps: fixed TA (Timing Advance), i.e., calculated from the position of the satellite relative to the speed of light propagation time of a reference point;
the method 2 comprises the following steps: estimating TA by only depending on UE, namely calculating unidirectional TA according to the known absolute position of sending a certain downlink reference signal and the position of receiving the certain downlink reference signal by the UE;
the method 3 comprises the following steps: the satellite indicates the distance between a certain UE and a reference point through signaling to give a TA specific to the UE;
the second category, TA based network broadcast/indication.
However, in the specific implementation process, the inventors of the embodiments of the present disclosure find that: in the downlink synchronization process, generally, the UE cannot accurately acquire the position of the satellite, and the UE cannot know the distance between the UE and the reference point, which greatly increases the complexity of the downlink synchronization between the UE and the satellite.
Generally, the ground devices communicating with the satellite include, but are not limited to, a UE and a gateway station (such as a fixed-position receiving station, a high-gain parabolic antenna, a satellite ground station, and the like), where the gateway station is more accurate in estimating a time delay between the UE and the satellite, that is, the estimated time delay of the gateway station is more accurate, and a distance between the gateway station and the UE can be estimated according to a common ground communication method.
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the embodiments of the present disclosure will be described in further detail below with reference to the accompanying drawings.
The following describes in detail the technical solutions of the embodiments of the present disclosure and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present disclosure will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an exemplary wireless communication system, and as shown in fig. 1, the mobile communication system may include: a number of user devices 110, 1 gateway station 120 and 1 satellite 130.
The user equipment 110 may communicate with a gateway station via a Radio Access Network (RAN). User device 110 may be a device that provides voice and/or data connectivity to a user, such as a smartphone, tablet, smart watch, and the like. Of course, the user equipment 110 may also be an internet of things device, such as a sensor device, a mobile phone (or referred to as a "cellular" phone), and a computer with an internet of things terminal, for example, a fixed, portable, pocket, handheld, computer-embedded or vehicle-mounted device, and for example, a mobile station (mobile station), a mobile station (mobile), a remote station (remote station), an access point, a remote terminal (remote terminal), an access terminal (access terminal), and the like, which are not limited by the embodiments of the present disclosure.
The gateway station 120 may be a fixed location receiving station, a high gain parabolic dish, etc. in a wireless communication system, and the gateway station 120 may also be a satellite earth station. The wireless communication system may be a 5G system, which is also called a New Radio (NR) system. Alternatively, the wireless communication system may be a next-generation system of a 5G system.
The satellites 130 may be geostationary orbit satellites, medium orbit satellites, low orbit satellites, and the like. A wireless connection may be established between the satellite 130 and the user equipment 110 over a wireless air interface. In different embodiments, the wireless air interface is a wireless air interface based on a fifth generation mobile communication network technology (5G) standard, for example, the wireless air interface is a new air interface; alternatively, the wireless air interface may be a wireless air interface based on a 5G next generation mobile communication network technology standard.
An embodiment of the present disclosure provides a downlink synchronization method, which is applied in the wireless communication system shown in fig. 1 and is performed by the user equipment 110 in fig. 1, as shown in fig. 2, the method includes:
step S210, receiving indication information sent by a gateway station, wherein the indication information is used for indicating a timing deviation between the gateway station and a satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite; step S220, referring to the timing offset, performing downlink synchronization with the satellite.
Although the ue can directly acquire downlink synchronization with the satellite, the ue cannot perform downlink synchronization with the satellite quickly and accurately due to the severe doppler frequency offset jitter and limited processing capability of the ue, which are caused by the extra long distance between the ue and the satellite. Considering that the satellite can communicate with the ground gateway station, the position of the gateway station is fixed, the distance between the gateway station and the satellite is also fixed, the processing capacity of the gateway station is relatively strong, the timing deviation between the gateway station and the satellite can be accurately calculated, and the value of the timing deviation is relatively stable, so that the user equipment can be assisted to complete the downlink synchronization between the user equipment and the satellite by means of the timing deviation between the gateway station and the satellite.
In the process of information transmission between the gateway station and the satellite, synchronization between the gateway station and the satellite is firstly needed, for example, when the gateway station needs to send information to the satellite, the gateway station needs to establish uplink synchronization with the satellite, and for example, when the satellite needs to send information to the gateway station, the satellite needs to establish downlink synchronization with the gateway station. The gateway station can estimate the timing deviation between the gateway station and the satellite by receiving a downlink synchronization signal transmitted by the satellite, so as to establish downlink synchronization with the satellite according to the timing deviation.
The gateway station can not only transmit information with the satellite, but also transmit information with each user equipment in the coverage area, and based on the information, the gateway station can transmit the estimated timing deviation between the gateway station and the satellite to each user equipment in the coverage area. The gateway station can transmit the timing deviation between the user equipment and the satellite by transmitting the indication information to each user equipment so as to assist each user equipment to complete downlink synchronization with the satellite. Correspondingly, for any user equipment within the coverage area of the gateway station, the user equipment receives indication information sent by the gateway station, the indication information is used for indicating the timing deviation between the gateway station and the satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite. After receiving the indication information sent by the gateway station, the user equipment can acquire the timing deviation between the gateway station and the satellite according to the indication information, and perform downlink synchronization with the satellite by referring to the timing deviation.
The user equipment can quickly determine the starting time point of receiving the satellite synchronization signal by referring to the timing deviation between the gateway station and the satellite, thereby quickly carrying out downlink synchronization with the satellite, greatly shortening the synchronization time between the user equipment and the satellite and effectively reducing the power consumption consumed by the synchronization between the user equipment and the satellite.
The downlink synchronization method provided by the embodiment of the disclosure can quickly perform downlink synchronization with a satellite by referring to the received timing deviation between a gateway station and the satellite, so that the user equipment can quickly lock the synchronization range of the downlink synchronization according to the accurate timing deviation between the gateway station and the satellite under the condition of initial synchronization, thereby not only greatly improving the speed, efficiency and accuracy of completing the downlink synchronization between the user equipment and the satellite, and greatly shortening the synchronization time between the user equipment and the satellite, but also greatly reducing the power consumption of performing the downlink synchronization between the user equipment and the satellite.
In the following, a downlink synchronization method according to an embodiment of the present disclosure is specifically described with reference to specific scenarios:
in a possible implementation manner, before receiving the indication information sent by the gateway station, the method further includes: receiving a ground synchronous signal sent by a gateway station; and synchronizing with the gateway station according to the ground synchronizing signal.
Generally, the first step of information transmission in a communication system is synchronization, and a communication system is formed between a gateway station and a user equipment, so that in the process of information transmission between the gateway station and the user equipment, synchronization is necessarily required to be firstly performed, namely, before the gateway station sends indication information to the user equipment, the user equipment needs to be firstly synchronized. The gateway station may synchronize with the user equipment (referred to as terrestrial synchronization) by transmitting a synchronization signal (referred to as terrestrial synchronization) to the user equipment. Correspondingly, the user equipment receives the ground synchronization signal transmitted by the gateway station.
After receiving the ground synchronizing signal sent by the gateway station, the user equipment can synchronize with the gateway station according to the ground synchronizing signal, thereby completing the ground synchronization with the gateway station. After the user equipment completes ground synchronization with the gateway station according to the ground synchronization signal, the user equipment can accurately acquire the indication information sent by the gateway station based on the ground synchronization signal, so as to acquire the timing deviation between the gateway station and the satellite, and then perform downlink synchronization with the satellite by referring to the timing deviation.
In one example, the gateway station may transmit the terrestrial synchronization signal and the indication information by transmitting a synchronization channel to the user equipment, i.e., the synchronization channel includes the terrestrial synchronization signal and the indication information. Correspondingly, the user equipment receives the ground synchronization signal and the indication information by receiving the synchronization channel transmitted by the gateway station. After receiving a synchronization channel sent by a gateway station, user equipment firstly establishes synchronization with the gateway station according to a ground synchronization signal in the synchronization channel, and acquires indication information in the synchronization channel after establishing synchronization, namely acquires timing deviation between the gateway station and a satellite.
In yet another example, the gateway station may transmit the terrestrial synchronization signal by transmitting a synchronization channel to the user equipment, and correspondingly, the user equipment receives the terrestrial synchronization signal by receiving the synchronization channel transmitted by the gateway station. After receiving the synchronous channel sent by the gateway station, the user equipment establishes synchronization with the gateway station according to the ground synchronous signal in the synchronous channel. After the user equipment and the gateway station establish synchronization, the gateway station may continue to transmit the indication information indicating the timing offset between the gateway station and the satellite to the user equipment through the synchronization channel, or through other transmission methods. Correspondingly, the user equipment receives the indication information sent by the gateway station and acquires the timing deviation between the gateway station and the satellite according to the indication information.
In the above two examples, the synchronization channel transmitted by the gateway station to the user equipment may be in a similar form of an NR (New Radio, New air interface) synchronization block, that is, the synchronization channel is transmitted to the user equipment in a similar form of an NR synchronization block.
In the above two examples, in the process of transmitting the synchronization channel to the user equipment by the gateway station, the gateway station may transmit the synchronization channel to the user equipment at a predetermined frequency, wherein the predetermined frequency may be a sideband frequency of the transmission frequency of the satellite, i.e., the gateway station transmits the synchronization channel to the user equipment at the sideband frequency of the transmission frequency of the satellite. Correspondingly, the user equipment receives the synchronization channel transmitted by the gateway station at a predetermined frequency, which is a sideband frequency of the transmission frequency of the satellite.
The above-mentioned sideband frequency of the transmission frequency of the satellite is only a preferred way of the predetermined frequency, the predetermined frequency is not limited to the sideband frequency of the transmission frequency of the satellite, and may be other feasible transmission frequencies.
It should be noted that, in the process of searching (or receiving) the ground synchronization signal transmitted by the gateway station, if the ground synchronization signal transmitted by the gateway station is not searched or received all the time, or if the ground synchronization signal transmitted by the gateway station is received but the received ground synchronization signal is weak (for example, the signal strength is lower than a predetermined strength threshold), the user equipment cannot establish synchronization with the gateway station, and naturally cannot receive the timing offset between the gateway station and the satellite transmitted by the gateway station, and at this time, cannot refer to the timing offset between the gateway station and the satellite to perform downlink with the satellite. In this case, the user equipment needs to perform downlink synchronization with the satellite by acquiring the downlink synchronization signal transmitted by the satellite, that is, the synchronization between the user equipment and the satellite is still performed by the downlink synchronization signal transmitted by the satellite. Therefore, the downlink synchronization method in the embodiment of the disclosure is an auxiliary enhancement method of a normal synchronization method (that is, the user equipment performs downlink synchronization with the satellite through the downlink synchronization signal sent by the satellite), and can greatly accelerate the synchronization speed between the user equipment and the satellite.
In other words, in some cases (e.g., the user equipment cannot establish synchronization with the gateway station), the user equipment may not rely on the gateway station to perform downlink synchronization with the satellite, but may perform downlink synchronization with the satellite by directly receiving the downlink synchronization signal of the satellite. When the user equipment searches or receives a ground synchronization signal sent by the gateway station, and the ground synchronization signal is relatively strong (for example, the signal strength is greater than or equal to a predetermined strength threshold), synchronization can be established with the gateway station according to the ground synchronization signal, so that the timing deviation between the gateway station and the satellite sent by the gateway station can be received, and downlink synchronization can be performed with the satellite by referring to the timing deviation between the gateway station and the satellite.
In one possible implementation, the reference timing offset, downlink synchronization with the satellite, includes: determining the distance between the user equipment and the gateway station according to the ground synchronous signal; and performing downlink synchronization with the satellite according to the timing deviation and the distance.
The user equipment, upon receiving the timing offset between the gateway station and the satellite, may perform downlink synchronization with the satellite directly based on the timing offset. However, since there is a distance between the user equipment and the gateway station, the timing offset between the gateway station and the satellite is not the actual timing offset between the user equipment and the satellite. Although the timing deviation between the gateway station and the satellite is not the actual timing deviation between the user equipment and the satellite, the timing deviation between the gateway station and the satellite provides a reliable reference basis for downlink synchronization between the user equipment and the satellite, so that the user equipment can quickly lock a synchronization range of downlink synchronization between the user equipment and the satellite according to the timing deviation between the gateway station and the satellite, and after the user equipment locks the synchronization range, the user equipment can further search an accurate synchronization point between the user equipment and the satellite in the synchronization range according to a feasible calculation mode (such as correlation peak calculation) and complete the downlink synchronization between the user equipment and the satellite.
The distance between the user equipment and the gateway station may be estimated from signal transmissions between the gateway station and the user equipment, for example, from a ground synchronization signal sent by the gateway station, i.e., the distance between the user equipment and the gateway station is determined from the ground synchronization signal. If the gateway station transmits the terrestrial synchronization signal at time t1, the terrestrial synchronization signal received by the user equipment at time t2, then the distance between the user equipment and the gateway station can be estimated as (t2-t1)/c, where c is the speed of light.
After the distance between the user equipment and the gateway station is obtained, the user equipment can perform downlink synchronization with the satellite according to the timing deviation between the gateway station and the satellite and the distance between the user equipment and the gateway station, so that the user equipment can complete the downlink synchronization with the satellite more quickly and accurately within a locked synchronization range according to the distance between the user equipment and the gateway station.
In the process of downlink synchronization with the satellite according to the timing deviation between the gateway station and the satellite and the distance between the user equipment and the gateway station, the user equipment can determine whether the received timing deviation between the gateway station and the satellite needs to be compensated according to the distance between the user equipment and the gateway station, for example, a timing deviation compensation value is compensated on the basis of the timing deviation, and then downlink synchronization with the satellite is performed according to the compensated value.
In practice, it may be determined whether compensation for the timing offset between the received gateway station and the satellite is required based on whether the distance between the user equipment and the gateway station exceeds a predetermined distance threshold. In one example, when the distance between the user equipment and the gateway station does not exceed the predetermined distance threshold, it indicates that the user equipment and the gateway station are relatively close to each other, and the distance may be ignored, i.e., the timing offset between the gateway station and the satellite received by the user equipment is not compensated, and the timing offset between the gateway station and the satellite may be directly used as the timing offset between the user equipment and the satellite, i.e., the timing offset is directly used for downlink synchronization with the satellite.
In another example, when the distance between the user equipment and the gateway station exceeds the predetermined distance threshold, which indicates that the user equipment and the gateway station are relatively far away from each other, the distance may not be ignored, and a timing offset compensation value to be compensated is determined based on the distance, that is, a timing offset compensation value is additionally compensated based on the timing offset, which is equivalent to adding a timing offset compensation value to the timing offset to obtain a sum of the timing offset and the timing offset compensation value, and then downlink synchronization is performed with the satellite according to the sum of the timing offset and the timing offset compensation value. If the timing offset is 1 second, the timing offset compensation value is 0.01 second, i.e. the sum of the timing offset and the timing offset compensation value is 1.01 second, then the ue needs to perform downlink synchronization with the satellite according to the compensated 1.01 second.
In the process of determining the timing deviation compensation value to be compensated based on the distance, the distance between the satellite and the user equipment can be estimated from a triangle formed by the satellite, the gateway station, and the user equipment (denoted by D1). In the specific calculation process, since the distance between the gateway station and the satellite (denoted as Dn) is specifically calculated and is fixed, the distance between the gateway station and the user equipment (denoted as D0) is also calculated according to the signal transmission between the gateway station and the user equipment, and therefore, the distance D1 between the satellite and the user equipment can be easily calculated according to the relationship between the three sides of the triangle. After the distance D1 is calculated, a timing offset compensation value to be compensated can be calculated according to the difference between the distances D1 and Dn and the timing offset corresponding to the distance Dn (i.e., the timing offset between the gateway station and the satellite), so as to obtain the timing offset corresponding to the distance D1 (i.e., the timing offset between the user equipment and the satellite), wherein the timing offset corresponding to the distance D1 is the sum of the timing offset corresponding to the distance Dn and the timing offset compensation value.
Fig. 3 is a schematic diagram illustrating an interaction process among a user equipment, a gateway station, and a satellite according to an embodiment of the disclosure, where in fig. 3, step S310: sending a downlink synchronous signal, namely sending the downlink synchronous signal to a gateway station by the satellite so that the gateway station performs downlink synchronization with the satellite according to the downlink synchronous signal; step S320: estimating the timing deviation between the gateway station and the satellite, namely the gateway station estimates the timing gateway between the gateway station and the satellite according to the received downlink synchronous signal; step S330, sending a synchronous channel, wherein the synchronous channel comprises a ground synchronous signal and indication information, and the indication information is used for indicating timing deviation, namely, the gateway station sends the synchronous information and the timing deviation between the gateway station and the satellite by sending the synchronous channel to the user equipment; step S340: and quickly performing downlink synchronization with the satellite by referring to the timing deviation, namely the user equipment can quickly perform downlink synchronization with the satellite based on the received timing deviation between the gateway station and the satellite.
By the method of the embodiment of the disclosure, when the user equipment enters the non-idle state from the idle state, the downlink synchronization with the satellite can be quickly and accurately completed by referring to the timing deviation between the gateway station and the satellite, and the downlink synchronization with the satellite is tried without a long time in advance when the user equipment is in the idle state, so that the downlink synchronization with the satellite can be quickly and accurately completed when the user equipment enters the non-idle state, and the power consumption of the user equipment is greatly reduced.
An embodiment of the present disclosure provides a downlink synchronization method, which is applied in the wireless communication system shown in fig. 1 and is performed by the gateway station 120 in fig. 1, as shown in fig. 4, and the method includes:
step S410, sending indication information to the user equipment, where the indication information is used to indicate a timing offset between the gateway station and the satellite, where the timing offset is obtained by the gateway station according to a downlink synchronization signal sent by the satellite, and is used to synchronize the user equipment with the satellite.
In a possible implementation manner, before sending the indication information to the user equipment, the method further includes:
and sending a ground synchronization signal to the user equipment so that the user equipment synchronizes with the gateway station according to the ground synchronization signal.
In one possible implementation, the terrestrial synchronization signal and/or the indication information is transmitted by transmitting a synchronization channel to the user equipment.
In one possible implementation, the synchronization channel is transmitted to the user equipment at a predetermined frequency, which is a sideband frequency of the transmission frequency of the satellite.
It should be noted that the downlink synchronization method at the gateway station side provided in the embodiment of the present disclosure corresponds to the downlink synchronization method at the user equipment side provided in the embodiment of the present disclosure, and therefore, it can be understood that the processing step of the downlink synchronization at the gateway station side corresponds to the step of the downlink synchronization at the user equipment side, and the processing step of the downlink synchronization at the gateway station side is not described herein again. For a detailed description of the corresponding step of the downlink synchronization at the user equipment side, reference may be made to the corresponding description in the foregoing.
The downlink synchronization method provided by the embodiment of the disclosure can quickly perform downlink synchronization with a satellite by referring to the received timing deviation between a gateway station and the satellite, so that the user equipment can quickly lock the synchronization range of the downlink synchronization according to the accurate timing deviation between the gateway station and the satellite under the condition of initial synchronization, thereby not only greatly improving the speed, efficiency and accuracy of completing the downlink synchronization between the user equipment and the satellite, and greatly shortening the synchronization time between the user equipment and the satellite, but also greatly reducing the power consumption of performing the downlink synchronization between the user equipment and the satellite.
Fig. 5 is a schematic structural diagram of a user equipment according to yet another embodiment of the present disclosure, as shown in fig. 4, the apparatus 500 may include a receiving module 501 and a synchronization module 502, where:
the receiving module 501 is configured to receive indication information sent by a gateway station, where the indication information is used to indicate a timing offset between the gateway station and a satellite, and the timing offset is obtained by the gateway station according to a downlink synchronization signal sent by the satellite;
the synchronization module 502 is configured to perform downlink synchronization with the satellite at the reference timing offset.
In one possible implementation, the receiving module is further configured to:
receiving a ground synchronous signal sent by a gateway station;
and synchronizing with the gateway station according to the ground synchronizing signal.
In one possible implementation, the receiving module is configured to receive the ground synchronization signal and/or the indication information by receiving a synchronization channel transmitted by the gateway station.
In one possible implementation, the synchronization module is configured to:
determining the distance between the user equipment and the gateway station according to the ground synchronous signal;
and performing downlink synchronization with the satellite according to the timing deviation and the distance.
In one possible implementation, the synchronization module, when performing downlink synchronization with the satellite according to the timing offset and the distance, is configured to:
when the distance is determined to be smaller than or equal to the preset distance threshold, directly utilizing the timing deviation to perform downlink synchronization with the satellite;
and when the distance is determined to be larger than the preset distance threshold value, determining a timing deviation compensation value needing to be compensated based on the distance, and performing downlink synchronization with the satellite according to the sum of the timing deviation and the timing deviation compensation value.
In one possible implementation, the receiving module is configured to receive a synchronization channel transmitted by the gateway station at a predetermined frequency, the predetermined frequency being a sideband frequency of the transmission frequency of the satellite.
The user equipment provided by the embodiment of the disclosure can quickly perform downlink synchronization with the satellite by referring to the received timing deviation between the gateway station and the satellite, so that the user equipment can quickly lock the synchronization range of the downlink synchronization according to the accurate timing deviation between the gateway station and the satellite under the condition of initial synchronization, the speed, the efficiency and the accuracy of the downlink synchronization between the user equipment and the satellite can be greatly improved, the synchronization time between the user equipment and the satellite is greatly shortened, and the power consumption of the downlink synchronization between the user equipment and the satellite can be greatly reduced.
It should be noted that this embodiment is an apparatus embodiment corresponding to the method embodiment of the ue side, and this embodiment may be implemented in cooperation with the method embodiment of the ue side. The related technical details mentioned in the method item embodiment of the user equipment side are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related technical details mentioned in the present embodiment can also be applied in the above method item embodiment on the user equipment side.
Fig. 6 is a schematic structural diagram of a gateway station device according to yet another embodiment of the present disclosure, and as shown in fig. 6, the apparatus 600 may include a sending module 601, where:
a sending module 601, configured to send indication information to the user equipment, where the indication information is used to indicate a timing offset between the gateway station and the satellite, and the timing offset is obtained by the gateway station according to a downlink synchronization signal sent by the satellite, and is used to synchronize the user equipment with the satellite.
In one possible implementation, the transmitting module is further configured to transmit a terrestrial synchronization signal to the user equipment, so that the user equipment synchronizes with the gateway station according to the terrestrial synchronization signal.
In one possible implementation, the transmitting module is configured to transmit the terrestrial synchronization signal and/or the indication information by transmitting a synchronization channel to the user equipment.
In one possible implementation, the transmitting module is configured to transmit the synchronization channel to the user equipment at a predetermined frequency, the predetermined frequency being a sideband frequency of a transmission frequency of the satellite.
The gateway station equipment provided by the embodiment of the disclosure performs downlink synchronization with the satellite by referring to the received timing deviation between the gateway station and the satellite, so that the user equipment can quickly lock the synchronization range of the downlink synchronization according to the accurate timing deviation between the gateway station and the satellite under the condition of initial synchronization, the speed, the efficiency and the accuracy of the downlink synchronization between the user equipment and the satellite can be greatly improved, and the time consumption and the power consumption of the downlink synchronization between the user equipment and the satellite can be greatly reduced.
It should be noted that this embodiment is an apparatus embodiment corresponding to the above method embodiment of the gateway station side, and this embodiment can be implemented in cooperation with the above method embodiment of the gateway station side. The related technical details mentioned in the above method item embodiment of the gateway station side are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the details of the related art mentioned in the present embodiment can also be applied to the above method item embodiment of the gateway station side.
Another embodiment of the present disclosure provides an electronic device, as shown in fig. 7, an electronic device 700 shown in fig. 7 includes: a processor 701 and a memory 703. The processor 701 is coupled to a memory 703, such as via a bus 702. Further, the electronic device 700 may also include a transceiver 704. It should be noted that the transceiver 704 is not limited to one in practical applications, and the structure of the electronic device 700 is not limited to the embodiment of the present disclosure.
The processor 701 is applied to the embodiment of the present disclosure to implement the functions of the receiving module and the synchronizing module shown in fig. 4, or to implement the functions of the sending module shown in fig. 5. The transceiver 704 includes a receiver and a transmitter.
The processor 701 may be a CPU, general purpose processor, DSP, ASIC, FPGA or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 701 may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.
The memory 703 may be, but is not limited to, ROM or other type of static storage device that can store static information and instructions, RAM or other type of dynamic storage device that can store information and instructions, EEPROM, CD-ROM or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
The memory 703 is used for storing application program code for performing aspects of the present disclosure and is controlled in execution by the processor 701. The processor 701 is configured to execute application program code stored in the memory 703 to implement the actions of the user equipment provided in the embodiment shown in fig. 4 or to implement the actions of the gateway station equipment provided in the embodiment shown in fig. 5.
The electronic device provided by the embodiment of the disclosure comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein when the processor executes the program, the functions of the following two aspects can be realized:
on one hand, receiving indication information sent by a gateway station, wherein the indication information is used for indicating the timing deviation of the gateway station, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by a satellite; then, the satellite is synchronized with the downlink with reference to the timing offset.
On the other hand, indication information is sent to the user equipment, the indication information is used for indicating the timing deviation of the gateway station, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite, so that the user equipment can carry out downlink synchronization with the satellite by referring to the timing deviation.
The disclosed embodiments provide a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the method shown in the above embodiments. The method and the device have the advantages that the received timing deviation between the gateway station and the satellite is referred to, downlink synchronization can be rapidly carried out with the satellite, so that the user equipment can rapidly lock the synchronization range of the downlink synchronization according to the accurate timing deviation between the gateway station and the satellite under the condition of initial synchronization, the speed, the efficiency and the accuracy of the downlink synchronization between the user equipment and the satellite can be greatly improved, the synchronization time between the user equipment and the satellite is greatly shortened, and the power consumption of the downlink synchronization between the user equipment and the satellite can be greatly reduced.
The computer-readable storage medium provided by the embodiment of the disclosure is applicable to any embodiment of the method.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present disclosure, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present disclosure, and these modifications and decorations should also be regarded as the protection scope of the present disclosure.
Claims (14)
1. A downlink synchronization method is applied to user equipment, and includes:
receiving indication information sent by a gateway station, wherein the indication information is used for indicating a timing deviation between the gateway station and a satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite;
and performing downlink synchronization with the satellite by referring to the timing deviation.
2. The method of claim 1, wherein prior to receiving the indication from the gateway station, further comprising:
receiving a ground synchronization signal sent by the gateway station;
and synchronizing with the gateway station according to the ground synchronizing signal.
3. The method according to claim 2, wherein the terrestrial synchronization signal and/or the indication information is received via a synchronization channel transmitted by a receiving gateway station.
4. The method of claim 2, wherein said down-synchronizing with said satellite with reference to said timing offset comprises:
determining the distance between the user equipment and the gateway station according to the ground synchronization signal;
and performing downlink synchronization with the satellite according to the timing deviation and the distance.
5. The method of claim 4, wherein the down-synchronizing with the satellite according to the timing offset and the distance comprises:
when the distance is determined to be smaller than or equal to a preset distance threshold value, directly utilizing the timing deviation to perform downlink synchronization with the satellite;
and when the distance is determined to be larger than a preset distance threshold value, determining a timing deviation compensation value needing to be compensated based on the distance, and performing downlink synchronization with the satellite according to the sum of the timing deviation and the timing deviation compensation value.
6. The method of claim 3, wherein the synchronization channel transmitted by the gateway station at a predetermined frequency is received, wherein the predetermined frequency is a sideband frequency of the transmission frequency of the satellite.
7. A downlink synchronization method is applied to a gateway station device, and comprises the following steps:
and sending indication information to user equipment, wherein the indication information is used for indicating a timing deviation between the gateway station and a satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite and is used for synchronizing the user equipment with the satellite.
8. The method of claim 7, wherein before the sending the indication information to the user equipment, further comprising:
and sending a ground synchronization signal to the user equipment so that the user equipment synchronizes with the gateway station according to the ground synchronization signal.
9. The method according to claim 8, wherein the terrestrial synchronization signal and/or the indication information is transmitted by transmitting a synchronization channel to a user equipment.
10. The method of claim 9, wherein the synchronization channel is transmitted to the user equipment at a predetermined frequency, and wherein the predetermined frequency is a sideband frequency of a transmission frequency of the satellite.
11. A user device, comprising:
the receiving module is configured to receive indication information sent by a gateway station, wherein the indication information is used for indicating a timing deviation between the gateway station and a satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal sent by the satellite;
the synchronization module is configured to perform downlink synchronization with the satellite based on the timing offset.
12. A gateway station apparatus, comprising:
the transmitting module is configured to transmit indication information to a user equipment, wherein the indication information is used for indicating a timing deviation between the gateway station and a satellite, and the timing deviation is obtained by the gateway station according to a downlink synchronization signal transmitted by the satellite, so that the user equipment is synchronized with the satellite.
13. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1-10 when executing the program.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the method of any one of claims 1 to 10.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7142878B1 (en) * | 1999-11-12 | 2006-11-28 | Lucent Technologies Inc. | Method of timing calibration |
| CN102231908A (en) * | 2011-07-11 | 2011-11-02 | 北京大学 | Uplink signal timing synchronous prediction compensation method used for satellite mobile communication |
| CN107528628A (en) * | 2017-09-28 | 2017-12-29 | 中国电子科技集团公司第七研究所 | The signal synchronizing method of satellite communication system, device and system |
| CN109474986A (en) * | 2018-12-27 | 2019-03-15 | 西安电子科技大学 | Uplink synchronisation method, device, equipment, storage medium and LTE communication system |
| US20190116571A1 (en) * | 2016-03-30 | 2019-04-18 | Lg Electronics Inc. | Method for determining transmission timing in v2x ue |
| WO2019201438A1 (en) * | 2018-04-18 | 2019-10-24 | Huawei Technologies Duesseldorf Gmbh | Techniques for network-based time synchronization for ue sidelink and/or uplink communication |
| CN110446254A (en) * | 2019-09-12 | 2019-11-12 | 成都天奥集团有限公司 | A kind of uplink timing advance predictably terminal imagination method for satellite communication system |
| US20190349877A1 (en) * | 2018-05-11 | 2019-11-14 | Dish Network L.L.C. | Timing advance for satellite-based communications |
| CN110602779A (en) * | 2019-09-12 | 2019-12-20 | 成都天奥集团有限公司 | Synchronization frame-based satellite communication uplink closed loop timing synchronization method |
| CN110611949A (en) * | 2019-09-12 | 2019-12-24 | 成都天奥集团有限公司 | Method for predicting uplink timing advance gateway station of satellite communication system |
| CN111262640A (en) * | 2020-02-10 | 2020-06-09 | 北京华力创通科技股份有限公司 | Doppler shift testing method and device and readable storage medium |
-
2020
- 2020-06-29 CN CN202010612291.5A patent/CN113939005B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7142878B1 (en) * | 1999-11-12 | 2006-11-28 | Lucent Technologies Inc. | Method of timing calibration |
| CN102231908A (en) * | 2011-07-11 | 2011-11-02 | 北京大学 | Uplink signal timing synchronous prediction compensation method used for satellite mobile communication |
| US20190116571A1 (en) * | 2016-03-30 | 2019-04-18 | Lg Electronics Inc. | Method for determining transmission timing in v2x ue |
| CN107528628A (en) * | 2017-09-28 | 2017-12-29 | 中国电子科技集团公司第七研究所 | The signal synchronizing method of satellite communication system, device and system |
| WO2019201438A1 (en) * | 2018-04-18 | 2019-10-24 | Huawei Technologies Duesseldorf Gmbh | Techniques for network-based time synchronization for ue sidelink and/or uplink communication |
| US20190349877A1 (en) * | 2018-05-11 | 2019-11-14 | Dish Network L.L.C. | Timing advance for satellite-based communications |
| CN109474986A (en) * | 2018-12-27 | 2019-03-15 | 西安电子科技大学 | Uplink synchronisation method, device, equipment, storage medium and LTE communication system |
| CN110446254A (en) * | 2019-09-12 | 2019-11-12 | 成都天奥集团有限公司 | A kind of uplink timing advance predictably terminal imagination method for satellite communication system |
| CN110602779A (en) * | 2019-09-12 | 2019-12-20 | 成都天奥集团有限公司 | Synchronization frame-based satellite communication uplink closed loop timing synchronization method |
| CN110611949A (en) * | 2019-09-12 | 2019-12-24 | 成都天奥集团有限公司 | Method for predicting uplink timing advance gateway station of satellite communication system |
| CN111262640A (en) * | 2020-02-10 | 2020-06-09 | 北京华力创通科技股份有限公司 | Doppler shift testing method and device and readable storage medium |
Non-Patent Citations (2)
| Title |
|---|
| NOKIA, NOKIA SHANGHAI BELL: ""R1-1913017 Doppler Compensation, Uplink Timing Advance and Random Access in NTN"", 3GPP TSG_RAN\\WG1_RL1 * |
| THALES: ""R1-1905180 - On Timing Advance in NTN"", 3GPP TSG_RAN\\WG1_RL1, pages 2 * |
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| Publication number | Publication date |
|---|---|
| CN113939005B (en) | 2024-05-07 |
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