CN107333241A - The up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems - Google Patents

The up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems Download PDF

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Publication number
CN107333241A
CN107333241A CN201710650857.1A CN201710650857A CN107333241A CN 107333241 A CN107333241 A CN 107333241A CN 201710650857 A CN201710650857 A CN 201710650857A CN 107333241 A CN107333241 A CN 107333241A
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satellite
mrow
beam center
ground based
based terminal
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CN201710650857.1A
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CN107333241B (en
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朱立东
刘坤
卓永宁
廖为城
秦思高
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • 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 present invention relates to wideband satellite communication navigation field, the up transmitting terminal timing adjusting method of more particularly to a kind of satellite mobile communication based on LTE systems.The present invention is a kind of up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems, solves the up timing synchronisation problems of satellite LTE, eliminates and TA is utilized in LTE（Timing Advance）Carry out the process of receiving terminal Timing Synchronization, the big caused targeting sequencing design of user's transmission time delay difference in satellite beams and test problems are also solved simultaneously, user's access one-time success rate is improved, influence of the Doppler frequency shift to up Timing Synchronization is reduced, improves effectiveness.

Description

The up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems
Technical field
The present invention relates to wideband satellite communication navigation field, more particularly to a kind of satellite mobile communication based on LTE systems Up transmitting terminal timing adjusting method.
Background technology
Supplement and extension of the satellite mobile communication as ground-based cellular systems, with area coverage is big, communication distance is remote, logical Believe that the big grade one of capacity is advantage, be the indispensable communication mode for realizing the seamless covering of global network.Existing satellite is moved Dynamic communication system uses FDMA, TDMA or CDMA multi-access mode, mainly supports text, voice etc. compared with the business of low rate, it is difficult to The transmission of the multimedia messages such as adaptive video, image.LTE technologies are applied to satellite mobile communication, data can be greatly improved Transmission rate, the availability of frequency spectrum and cell capacity.But, LTE is more applied to being still suffered from satellite mobile communication system Key issue needs research, such as peak-to-average force ratio control, Doppler frequency shift elimination, user's Stochastic accessing.
In satellite mobile communication based on LTE systems, the user uplink Timing Synchronization in same wave beam is to need to solve One of Important Problems.At present, ground LTE uses the accidental access signal detection in random access procedure, obtains user to satellite Time delay, and feed back to user using this time delay as Timing Advance, then user is timed adjustment again, so as to realize multi-purpose The up Timing Synchronization at family.But, the wave beam cell range of satellite mobile communication is more than terrestrial cellular cell, one wave beam of satellite Transmission time delay difference is larger between interior user, it is therefore desirable to which accidental access signal form etc. is redesigned, this design Telecommunication system resources consumption can typically be increased, easily influenceed by Doppler frequency shift, and will to user's access one-time success rate Ask higher.
The content of the invention
It is an object of the invention to：Simplify the up Timing Synchronization stream of satellite mobile communication based on LTE systems to be further A kind of journey, it is proposed that the up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems.
To achieve the above object, the present invention proposes a kind of up transmitting terminal of the satellite mobile communication based on LTE systems and determined When method of adjustment, it comprises the following steps,
A kind of up transmitting terminal timing adjusting method of satellite mobile communication based on LTE systems, comprises the following steps：
(1) first ground based terminal obtains satellite projects at least one wave beam on ground, and self-position is determined from wave beam Information；
(2) pilot signal of satellite launch is received, the satellite almanac data at newest moment is obtained, and then determine current time Satellite position information and beam center positional information；
(3) according to own location information and satellite position information, beam center positional information, calculate the first ground based terminal with The distance of satellite, and, the distance of beam center and satellite obtains the very first time and ripple needed for itself being propagated to the signal of satellite The delay inequality of second time needed for the signal of beam center to satellite is propagated；
(4) relative to the second ground based terminal at beam center position, first ground based terminal time delay in advance The duration of difference sends upward signal；By being timed adjustment to ground terminal transmission upward signal so that Different Ground terminal The signal of transmitting reaches satellite simultaneously, realizes satellite reception end Timing Synchronization.
Further, the communication system of the satellite is LTE.
Further, in the step (3), the first ground based terminal or beam center are apart from calculation formula to satellite：
In formula, d is required distance；ReFor the mean radius of the earth；R is the distance between satellite and the earth's core；θ is in the earth Heart angle, its calculation formula is：
Wherein,WithThe respectively longitude and latitude of ground point and satellite；The ground point is the first ground based terminal Position or beam center position.
Further, the delay inequality calculation formula is：
In formula, Δ τ is required delay inequality；C is the spread speed of light；D is the first ground based terminal to the distance of satellite, dr For the distance of beam center position to satellite.
Further, the positional information includes longitude, latitude and height.
Compared with prior art, beneficial effects of the present invention：The present invention is a kind of satellite mobile communication based on LTE systems Up transmitting terminal timing adjusting method, solves the up timing synchronisation problems of satellite LTE, eliminates in LTE and (regularly to be carried using TA Preceding amount) carry out the process of receiving terminal Timing Synchronization, while also solve in satellite beams user's transmission time delay difference it is big caused by before Sequences Design and test problems are led, user's access one-time success rate is improved, reduces Doppler frequency shift to up Timing Synchronization Influence, improve effectiveness.
Brief description of the drawings：
Fig. 1 is the schematic flow sheet of the inventive method；
Fig. 2 is the system architecture schematic diagram of the inventive method；
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.But this should not be interpreted as to this The scope for inventing above-mentioned theme is only limitted to following embodiment, all to belong to the present invention based on the technology that present invention is realized Scope.
Embodiment 1：As shown in figure 1, the present embodiment provides a kind of up transmitting terminal timing adjustment sides of multi-beam satellite LTE Method, comprises the following steps,
S1：In a wave beam of satellite projects to ground, the satellite that some first ground based terminal UE has by itself Positioning function (such as GPS, the Big Dipper, Galileo, the present embodiment is by taking GPS as an example) determines the positional information of itself, the positional information bag Include but be not limited to longitude, latitude and height.Specifically, the ground based terminal refers to cover the use in beam area in the satellite In the processing unit communicated with the satellite, some ground based terminals access the satellite with improved LTE, and described the One ground based terminal UE refers to any one in some ground based terminals.
S2：The first ground based terminal UE obtains the satellite ephemeris at newest moment by receiving the pilot signal of satellite launch Etc. data, and then the satellite position information and beam center positional information at current time are determined, positional information includes longitude, latitude And height；The pilot signal includes satellite ephemeris information, satellite beams substar positional information etc., and the ground based terminal is received The purpose of pilot signal is for the beam center positional information of wave beam where confirming the satellite and the first ground based terminal UE.
S3：The first ground based terminal UE according to the positional information obtained, calculate respectively the first ground based terminal UE with The distance of satellite, and beam center position is to the distance of satellite, and then try to achieve ground based terminal UE and arrived to satellite with beam center The signal transmission delay of satellite is poor；Specifically, distance of the satellite to the first ground based terminal UE to satellite, or, beam center is arrived Satellite apart from calculation formula is：
In formula, d is distance of the satellite to ground point；ReFor the mean radius of the earth；R between satellite and the earth's core away from From；θ is earth central angle, and its calculation formula is：
Wherein,WithThe respectively longitude and latitude of ground point and satellite.Ground point is in ground based terminal UE or wave beam The heart.
UE is relative to the delay inequality calculation formula that beam center to satellite is transmitted：
In formula, Δ τ is required delay inequality；C is the spread speed of light；D and drRespectively in ground based terminal UE and wave beam The distance between the heart and satellite, as shown in Figure 2.
S4：First ground based terminal UE calculates obtained delay inequality Δ τ according to step S3, relative to positioned at beam center position The duration transmission upward signal of second ground based terminal at place, the in advance delay inequality.Specifically, ground based terminal UE sends upward signal At the time of be t0, then it is t at the time of the second ground based terminal at beam center position sends upward signal0+Δτ.By right Ground based terminal transmitting upward signal is timed adjustment so that the signal of Different Ground terminal transmission reaches satellite simultaneously, realizes Satellite reception end Timing Synchronization.

Claims (5)

1. the up transmitting terminal timing adjusting method of a kind of satellite mobile communication based on LTE systems, it is characterised in that including as follows Step：
(1) first ground based terminal obtains satellite projects at least one wave beam on ground, and own location information is determined from wave beam；
(2) pilot signal of satellite launch is received, the satellite almanac data at newest moment is obtained, and then determine defending for current time Star positional information and beam center positional information；
(3) according to own location information and satellite position information, beam center positional information, the first ground based terminal and satellite are calculated Distance and beam center and satellite distance, obtain the very first time and beam center needed for itself being propagated to the signal of satellite Signal to satellite propagates the delay inequality of required second time；
(4) relative to the second ground based terminal at beam center position, first ground based terminal delay inequality in advance Duration sends upward signal.
2. the method as described in claim 1, it is characterised in that the communication system of the satellite is LTE.
3. the method as described in claim 1, it is characterised in that in the step (3), the first ground based terminal or beam center are arrived Satellite apart from calculation formula is：
<mrow> <mi>d</mi> <mo>=</mo> <msqrt> <mrow> <msubsup> <mi>R</mi> <mi>e</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msup> <mi>r</mi> <mn>2</mn> </msup> <mo>-</mo> <mn>2</mn> <msub> <mi>R</mi> <mi>e</mi> </msub> <mi>r</mi> <mi> </mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </msqrt> <mo>;</mo> </mrow>
In formula, d is required distance；ReFor the mean radius of the earth；R is the distance between satellite and the earth's core；θ is earth central angle, Its calculation formula is：
Wherein,WithThe respectively longitude and latitude of ground point and satellite；The ground point be the first ground based terminal position or Beam center position.
4. method as claimed in claim 3, it is characterised in that the delay inequality calculation formula is：
<mrow> <mi>&amp;Delta;</mi> <mi>&amp;tau;</mi> <mo>=</mo> <mfrac> <mrow> <mo>|</mo> <mi>d</mi> <mo>-</mo> <msub> <mi>d</mi> <mi>r</mi> </msub> <mo>|</mo> </mrow> <mi>c</mi> </mfrac> <mo>;</mo> </mrow>
In formula, Δ τ is required delay inequality；C is the spread speed of light；D is the first ground based terminal to the distance of satellite, drFor ripple Distance of the beam center position to satellite.
5. the method as described in claim 1, it is characterised in that the positional information includes longitude, latitude and height.
CN201710650857.1A 2017-08-02 2017-08-02 Satellite mobile communication uplink transmitting terminal timing adjustment method based on LTE system Active CN107333241B (en)

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Cited By (24)

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CN107682074A (en) * 2017-11-08 2018-02-09 南京天际易达通信技术有限公司 A kind of compensation method of satellite uplink signal launch time, device and 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
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
CN110636601A (en) * 2019-09-12 2019-12-31 成都天奥集团有限公司 Self-maintenance method for uplink timing terminal of low-earth-orbit satellite communication system
CN111107625A (en) * 2019-12-27 2020-05-05 海能达通信股份有限公司 Uplink synchronization method, terminal and base station
CN111132002A (en) * 2019-11-26 2020-05-08 北京长焜科技有限公司 Long-distance access method based on LTE wireless communication technology
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CN111565472A (en) * 2019-02-14 2020-08-21 电信科学技术研究院有限公司 Method and equipment for determining timing advance
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CN111787604A (en) * 2019-04-04 2020-10-16 电信科学技术研究院有限公司 Control method, terminal and storage medium for uplink power
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WO2021027346A1 (en) * 2019-08-12 2021-02-18 华为技术有限公司 Common timing advance indication method and apparatus, device, and storage medium
CN112399541A (en) * 2019-08-16 2021-02-23 华为技术有限公司 Uplink power control method and device suitable for non-ground network
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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
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
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WO2020169048A1 (en) * 2019-02-23 2020-08-27 华为技术有限公司 Method for updating timing advance, terminal and base station
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CN111787604A (en) * 2019-04-04 2020-10-16 电信科学技术研究院有限公司 Control method, terminal and storage medium for uplink power
US11290178B2 (en) 2019-04-12 2022-03-29 Parallel Wireless, Inc. Using low earth orbit satellites to overcome latency
WO2020221127A1 (en) * 2019-04-30 2020-11-05 中国移动通信有限公司研究院 Timing advance determination method and device
WO2020233482A1 (en) * 2019-05-17 2020-11-26 中兴通讯股份有限公司 Transmission configuration method and apparatus, communication node and communication device
WO2021027346A1 (en) * 2019-08-12 2021-02-18 华为技术有限公司 Common timing advance indication method and apparatus, device, and storage medium
CN112399541A (en) * 2019-08-16 2021-02-23 华为技术有限公司 Uplink power control method and device suitable for non-ground network
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WO2021031875A1 (en) * 2019-08-16 2021-02-25 华为技术有限公司 Uplink power control method applicable to non-terrestrial network, and device
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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
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
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
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
CN110636601A (en) * 2019-09-12 2019-12-31 成都天奥集团有限公司 Self-maintenance method for uplink timing terminal of low-earth-orbit satellite communication system
CN111132002A (en) * 2019-11-26 2020-05-08 北京长焜科技有限公司 Long-distance access method based on LTE wireless communication technology
CN111107625A (en) * 2019-12-27 2020-05-05 海能达通信股份有限公司 Uplink synchronization method, terminal and base station
WO2021129648A1 (en) * 2019-12-27 2021-07-01 海能达通信股份有限公司 Uplink synchronization method, terminal, and base station
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
WO2021232412A1 (en) * 2020-05-22 2021-11-25 株式会社Ntt都科摩 Terminal and method executed by terminal
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