CN107333241B - Satellite mobile communication uplink transmitting terminal timing adjustment method based on LTE system - Google Patents
Satellite mobile communication uplink transmitting terminal timing adjustment method based on LTE system Download PDFInfo
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- CN107333241B CN107333241B CN201710650857.1A CN201710650857A CN107333241B CN 107333241 B CN107333241 B CN 107333241B CN 201710650857 A CN201710650857 A CN 201710650857A CN 107333241 B CN107333241 B CN 107333241B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010295 mobile communication Methods 0.000 title claims abstract description 17
- 238000004891 communication Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000012772 sequence design Methods 0.000 abstract description 2
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
- H04B7/1855—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
- H04B7/18554—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using the position provided by an existing geolocalisation system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
Abstract
The invention relates to the field of broadband satellite communication navigation, in particular to a satellite mobile communication uplink transmitting terminal timing adjusting method based on an LTE system. The invention relates to a timing adjustment method for an uplink transmitting end of satellite mobile communication based on an LTE system, which solves the problem of uplink timing synchronization of the LTE system of the satellite, omits the process of utilizing TA (timing advance) to carry out timing synchronization of a receiving end in the LTE system, and solves the problems of preamble sequence design and detection caused by large transmission delay difference of users in satellite beams, thereby improving the success rate of one-time access of the users, reducing the influence of Doppler frequency shift on the uplink timing synchronization and improving the signal transmission efficiency.
Description
Technical Field
The invention relates to the field of broadband satellite communication navigation, in particular to a satellite mobile communication uplink transmitting terminal timing adjusting method based on an LTE system.
Background
As a complement and extension of the terrestrial cellular system, satellite mobile communication has a series of advantages such as large coverage area, long communication distance, and large communication capacity, and is an indispensable communication method for realizing seamless coverage of the global network. The existing satellite mobile communication system adopts FDMA, TDMA or CDMA multiple access mode, mainly supports the low speed service of text, voice and the like, and is difficult to adapt to the transmission of multimedia information of video, image and the like. The LTE technology is applied to satellite mobile communication, so that the data transmission rate, the frequency spectrum utilization rate and the cell capacity can be greatly improved. However, there are still many key issues to be studied in the application of LTE to satellite mobile communication systems, such as peak-to-average ratio control, doppler shift cancellation, user random access, etc.
In the satellite mobile communication based on the LTE system, uplink timing synchronization of users in the same beam is one of the key problems to be solved. At present, the ground LTE adopts random access signal detection in the random access process to obtain a time delay from a user to a satellite, and feeds back the time delay as a timing advance to the user, and then the user performs timing adjustment, thereby realizing uplink timing synchronization of multiple users. However, the beam cell range of satellite mobile communication is larger than that of a ground cell, and the transmission delay difference between users in one beam of a satellite is large, so that the random access signal format and the like need to be redesigned.
Disclosure of Invention
The invention aims to: in order to further simplify the uplink timing synchronization process of the satellite mobile communication based on the LTE system, a timing adjustment method of an uplink transmitting terminal of the satellite mobile communication based on the LTE system is provided.
In order to achieve the above object, the present invention provides a method for adjusting the timing of an uplink transmitting terminal of satellite mobile communication based on the LTE system, which comprises the following steps,
a satellite mobile communication uplink transmitting terminal timing adjustment method based on an LTE system comprises the following steps:
(1) the method comprises the steps that a first ground terminal obtains at least one wave beam projected to the ground by a satellite, and self-position information is determined from the wave beam;
(2) receiving a pilot signal transmitted by a satellite, acquiring satellite ephemeris data at the latest moment, and further determining satellite position information and beam center position information at the current moment;
(3) calculating the distance between the first ground terminal and the satellite and the distance between the beam center and the satellite according to the self-position information, the satellite position information and the beam center position information, and acquiring the time delay difference between the first time required by signal propagation from the self to the satellite and the second time required by signal propagation from the beam center to the satellite;
(4) relative to a second ground terminal located at the central position of the wave beam, the first ground terminal sends an uplink signal in advance of the time delay difference; the timing adjustment is carried out on the uplink signals transmitted by the ground terminals, so that the signals transmitted by different ground terminals can reach the satellite at the same time, and the timing synchronization of the satellite receiving end is realized.
Further, the communication system of the satellite is LTE.
Further, in the step (3), the distance between the first ground terminal or the beam center and the satellite is calculated as:
in the formula, d is the required distance; reIs the average radius of the earth; r is the distance between the satellite and the geocentric; theta is the earth central angle, and the calculation formula is as follows:
wherein the content of the first and second substances,
and
respectively the longitude and latitude of the ground point and the satellite; the ground point is a first ground terminal position or a beam center position.
Further, the delay difference calculation formula is as follows:
in the formula, delta tau is the time delay difference; c is the propagation speed of the light; d is the distance from the first ground terminal to the satellite, drThe distance from the beam center position to the satellite.
Further, the location information includes longitude, latitude, and altitude.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a timing adjustment method for an uplink transmitting end of satellite mobile communication based on an LTE system, which solves the problem of uplink timing synchronization of the LTE system of the satellite, omits the process of utilizing TA (timing advance) to carry out timing synchronization of a receiving end in the LTE system, and solves the problems of preamble sequence design and detection caused by large transmission delay difference of users in satellite beams, thereby improving the success rate of one-time access of the users, reducing the influence of Doppler frequency shift on the uplink timing synchronization and improving the signal transmission efficiency.
Description of the drawings:
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a system architecture diagram of the method of the present invention;
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1: as shown in fig. 1, the present embodiment provides a timing adjustment method for an LTE uplink transmitting end of a multi-beam satellite, including the following steps,
s1: in a beam projected from a satellite to the ground, a first ground terminal UE determines its own location information including, but not limited to, longitude, latitude and altitude through its own satellite positioning function (e.g. GPS, beidou, galileo, in this embodiment, the GPS is taken as an example). Specifically, the ground terminal refers to a processing device within the coverage beam range of the satellite for communicating with the satellite, the plurality of ground terminals access the satellite in LTE-advanced, and the first ground terminal UE refers to any one of the plurality of ground terminals.
S2: the first ground terminal UE acquires data such as satellite ephemeris at the latest moment by receiving a pilot signal transmitted by a satellite, and further determines satellite position information and beam center position information at the current moment, wherein the position information comprises longitude, latitude and altitude; the pilot signal includes satellite ephemeris information, satellite beam sub-satellite position information, and the like, and the purpose of the ground terminal receiving the pilot signal is to confirm beam center position information of a beam where the satellite and the first ground terminal UE are located.
S3: the first ground terminal UE respectively calculates the distance between the first ground terminal UE and the satellite and the distance between the beam center position and the satellite according to the obtained position information, and further obtains the signal propagation delay difference between the ground terminal UE and the satellite and between the beam center and the satellite; specifically, the distance from the satellite to the first ground terminal UE to the satellite, or the distance from the beam center to the satellite is calculated by the following formula:
in the formula, d is the distance from the satellite to the ground point; reIs the average radius of the earth; r is the distance between the satellite and the geocentric; theta is the earth central angle, and the calculation formula is as follows:
wherein the content of the first and second substances,
and
respectively, the latitude and longitude of the ground point and the satellite. The ground point is a ground terminal UE or a beam center.
The time delay difference calculation formula of the UE from the beam center to the satellite transmission is as follows:
in the formula, delta tau is the time delay difference; c is the propagation speed of the light; d and drRespectively the distance between the ground terminal UE and the beam center and the satellite, as shown in fig. 2.
S4: the first ground terminal UE calculates the time delay difference Δ τ according to step S3, and the time delay difference Δ τ is relative to the position located at the center of the beamAnd the second ground terminal sends the uplink signal in advance of the time delay difference. Specifically, the time when the ground terminal UE transmits the uplink signal is t0The time when the second ground terminal located at the beam center position transmits the uplink signal is t0+ Δ τ. The timing adjustment is carried out on the uplink signals transmitted by the ground terminals, so that the signals transmitted by different ground terminals can reach the satellite at the same time, and the timing synchronization of the satellite receiving end is realized.
Claims (5)
1. A satellite mobile communication uplink transmitting terminal timing adjustment method based on an LTE system is characterized by comprising the following steps:
(1) the method comprises the steps that a first ground terminal obtains at least one wave beam projected to the ground by a satellite, and self-position information is determined from the wave beam;
(2) receiving a pilot signal transmitted by a satellite, acquiring satellite ephemeris data at the latest moment, and further determining satellite position information and beam center position information at the current moment; the pilot signal comprises satellite ephemeris information and satellite beam sub-satellite point position information;
(3) calculating the distance between the first ground terminal and the satellite and the distance between the beam center and the satellite according to the self-position information, the satellite position information and the beam center position information, and acquiring the time delay difference between the first time required by signal propagation from the self to the satellite and the second time required by signal propagation from the beam center to the satellite;
(4) and relative to a second ground terminal positioned at the central position of the wave beam, the first ground terminal sends an uplink signal in advance of the time delay difference.
2. The method of claim 1, wherein the communication regime for the satellite is LTE.
3. The method of claim 1, wherein in step (3), the distance from the first ground terminal or the beam center to the satellite is calculated by the formula:
in the formula, d is the required distance; reIs the average radius of the earth; r is the distance between the satellite and the geocentric; theta is the earth central angle, and the calculation formula is as follows:
wherein the content of the first and second substances,
and
respectively the longitude and latitude of the ground point and the satellite; the ground point is a first ground terminal position or a beam center position.
4. The method of claim 3, wherein the delay spread is calculated by:
in the formula, delta tau is the time delay difference; c is the propagation speed of the light; d is the distance from the first ground terminal to the satellite, drThe distance from the beam center position to the satellite.
5. The method of claim 1, wherein the location information comprises a longitude, a latitude, and an altitude.
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| CN107682074B (en) * | 2017-11-08 | 2024-03-29 | 南京天际易达通信技术有限公司 | Satellite uplink signal transmitting time compensation method, device and communication system |
| US11082973B2 (en) * | 2018-06-20 | 2021-08-03 | Qualcomm Incorporated | Upstream timing control mechanisms for non-terrestrial networks |
| CN111526576B (en) * | 2019-02-01 | 2021-10-26 | 华为技术有限公司 | Timing advance updating method, device, equipment and storage medium |
| CN114928880B (en) * | 2019-02-14 | 2024-01-12 | 大唐移动通信设备有限公司 | Method and equipment for determining timing advance |
| CN111565472B (en) * | 2019-02-14 | 2022-05-20 | 大唐移动通信设备有限公司 | Method and equipment for determining timing advance |
| CN111586802A (en) | 2019-02-15 | 2020-08-25 | 索尼公司 | User equipment, central unit device, wireless communication method, and storage medium |
| CN114900882A (en) * | 2019-02-23 | 2022-08-12 | 华为技术有限公司 | Method, terminal and network equipment for updating timing advance |
| CN111615186B (en) * | 2019-02-23 | 2022-05-17 | 华为技术有限公司 | Method, terminal and network equipment for updating timing advance |
| US20200313755A1 (en) * | 2019-03-28 | 2020-10-01 | Mediatek Inc. | Assistance Information For Doppler Compensation In Non-Terrestrial Networks |
| CN111757457B (en) * | 2019-03-29 | 2022-03-29 | 华为技术有限公司 | Method and apparatus for uplink timing synchronization |
| CN111787604B (en) * | 2019-04-04 | 2024-02-27 | 大唐移动通信设备有限公司 | Uplink power control method, terminal and storage medium |
| US11290178B2 (en) | 2019-04-12 | 2022-03-29 | Parallel Wireless, Inc. | Using low earth orbit satellites to overcome latency |
| CN111867041B (en) * | 2019-04-30 | 2022-01-25 | 中国移动通信有限公司研究院 | Timing advance determination method and device |
| CN111953396B (en) * | 2019-05-17 | 2023-12-29 | 中兴通讯股份有限公司 | Transmission configuration method, device, communication node and communication equipment |
| CN112399546B (en) * | 2019-08-12 | 2022-11-18 | 华为技术有限公司 | Indication method, device, equipment and storage medium for public timing advance |
| CN112399541B (en) * | 2019-08-16 | 2022-08-09 | 华为技术有限公司 | Uplink power control method and device suitable for non-ground network |
| CN110446254B (en) * | 2019-09-12 | 2021-11-23 | 上海众睿通信科技有限公司 | Uplink timing advance terminal prediction method for satellite communication system |
| CN110636601B (en) * | 2019-09-12 | 2021-11-16 | 成都天奥集团有限公司 | Self-maintenance method for uplink timing terminal of low-earth-orbit satellite communication system |
| CN110611949B (en) * | 2019-09-12 | 2021-06-08 | 成都天奥集团有限公司 | Method for predicting uplink timing advance gateway station of satellite communication system |
| CN111132002B (en) * | 2019-11-26 | 2021-03-05 | 北京长焜科技有限公司 | Long-distance access method based on LTE wireless communication technology |
| CN111107625B (en) * | 2019-12-27 | 2022-04-15 | 海能达通信股份有限公司 | Uplink synchronization method, terminal and base station |
| CN115669099A (en) * | 2020-05-22 | 2023-01-31 | 株式会社Ntt都科摩 | Terminal and method executed by terminal |
| CN112738208A (en) * | 2020-12-25 | 2021-04-30 | 中国联合网络通信集团有限公司 | Data synchronization method, satellite node and block chain system |
| CN113612513B (en) * | 2021-06-18 | 2022-08-19 | 北京航天科工世纪卫星科技有限公司 | Communication satellite access control method and device based on navigation satellite text extension |
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