CN107197517A - The LTE satellite uplink synchronous method being grouped based on TA - Google Patents
The LTE satellite uplink synchronous method being grouped based on TA Download PDFInfo
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- CN107197517A CN107197517A CN201710651008.8A CN201710651008A CN107197517A CN 107197517 A CN107197517 A CN 107197517A CN 201710651008 A CN201710651008 A CN 201710651008A CN 107197517 A CN107197517 A CN 107197517A
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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
- 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
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Abstract
The present invention relates to wideband satellite communication navigation field, more particularly to a kind of LTE satellite uplink synchronous method being grouped based on TA.The present invention is applied to the synchronous method of satellite uplink based on the LTE that TA leads are grouped, packet configuration TA leads are carried out by the round-trip delay difference transmitted according to user link, avoid the setting scope of TA in modification ground LTE protocol standard, and by ensureing that TA leads, in a less scope, improve the validity and real-time of satellite communication.
Description
Technical field
The present invention relates to wideband satellite communication navigation field, more particularly to a kind of LTE satellite uplink chains being grouped based on TA
Road synchronous method.
Background technology
With the development of radio communication, the seamless coverage of Global Communications System is realized, GCS Ground Communication System leads to satellite
The system fusion of letter system is an inexorable trend.Current ground LTE system comes into extensive commercialization, realizes LTE system
Applicability in satellite communication, this merges, improved the data transmission rate of current satellite communication to Incorporate communication network
It is significant with the availability of frequency spectrum.
In LTE system, a key character of uplink is different UE orthogonal multiple access accesses on time-frequency
It is not interfere with each other between (orthogonal multiple access), the i.e. uplink of the different UE from same cell.For
Ensure the orthogonality of uplink, it is to avoid (intra-cell) is disturbed in cell, eNodeB requirements are from same subframe but not
What the time that the different UE of same frequency domain resource (different RB) signal reaches eNodeB was substantially aligned.As long as eNodeB exists
The upstream data transmitted by UE is received in the range of CP (Cyclic Prefix), it becomes possible to correctly decode upstream data, because
This, uplink synchronous requires that the signal arrival eNodeB of the different UE from same subframe time all falls within CP.In order to protect
The time synchronized of receiving side (eNodeB sides) is demonstrate,proved, LTE proposes up timing advance TA's (Uplink Timing Advance)
Mechanism.Timing Advance is relevant with radius of society.
Because satellite communication medium wave beam radius is typically much deeper than the radius of society of land mobile communication, cause user in wave beam
Between maximum round trip delay inequality it is larger so that the TA leads in current ground LTE system are not directly adaptable to use satellite and led to
In letter.Lead TA in the LTE standard of current ground is that the round-trip delay of different user in 0~0.67ms, but satellite beams is poor
It is larger, up to several milliseconds, so being that applicability improvement must be made to TA lead schemes.Current improvement project is not protected
The consistency of TA leads scope in existing LTE is held, causes to have impact on the maximum general character that satellite communication is merged with LTE system, and
And can not make and must improve for the long time delay characteristic of satellite communication so that real-time is more preferable.
The content of the invention
It is an object of the invention to：To realize applicability of the LTE system in satellite communication, carried for uplink synchronisation
A kind of design method being grouped for TA leads, this method can fully ensure that LTE in satellite communication and the existing commercialization in ground
The general character of LTE system, without changing the lead scope in agreement on TA.It ensure that Timing Advance is smaller at one simultaneously
Scope, improve the validity and real-time of satellite communication.
To achieve the above object, the present invention is applied to the synchronization of satellite uplink based on the LTE that Timing Advance is grouped
Design method, it comprises the following steps,
A kind of LTE satellite uplink synchronous method being grouped based on Timing Advance, is comprised the following steps,
Step one:According to the default random lead code of generation of the generation rule of random lead code in LTE protocol, user terminal UE hairs
Penetrate the signal for including the random lead code；The default random lead code of generation can be according to random lead code in LTE protocol
Generation rule is produced, and self-defined can also be produced.
Step 2：The link transmission that satellite calculates each user terminal UE to satellite according to the random lead code received comes and goes
Time delay；
Step 3：According to Timing Advance in the LTE system of ground (Timing Advance, TA) setting scope, at this
One reasonable value L of selection in individual scope, the L values should as close as the maximum in the range of Timing Advance so that after
The group number that face is divided into is as few as possible, and it is at least two to be divided to each user terminal UE according to each user terminal UE to satellite round-trip delay
Individual user's group；
Step 4：Satellite launches corresponding TA adjustment information to different user groups respectively；
Step 5：User in each user's group determines that information upstream sends the time according to the TA adjustment information received.Bag
Include, if up-link transmission is carried out with when carrying out up-link transmission, so that satellite reception end is between different grouping
Carry out time-division processing, same group of different user and synchronously reach that satellite reception end is handled simultaneously.
Further, user segment produces random lead code according to satellite orbital altitude, satellite according to receive it is random before
Leading code calculates each user terminal UE to the link transmission round-trip delay of satellite.
Further, the setting value L is all in the setting scope and satellite beams of ground LTE system TA leads connects
The maximum round trip delay inequality of access customer is determined；Its span is 0ms<L≤0.67ms.
Need to make the number of users of group number after packet as far as possible less, in every group as uniform as possible herein.So L can be with defending
Star orbit altitude, the factor such as satellite beams size and satellite elevation angle does adaptations.
Further, it is by the method that each user terminal UE points are different user groups：Obtain in single satellite beams each
Maximum transmitted round-trip delay Ts of the user terminal UE to satellitea, interior each user terminal UE of the satellite beams is obtained to the minimum past of satellite
Return time delay Tb, calculate the maximum round trip delay inequality Δ t=T of all user terminal UE in the satellite beamsa-Tb；
According to formulaIt is n user's group by each user terminal UE in the satellite beams points；Each user's group
Round-trip delay between interior user terminal UE is both less than or equal to L；When then all users can be pressed minimum round relative at B
The user's delay inequality prolonged is divided into n groups, is respectively [0, L*1], and (L*1, L*2] ... (L* (n-1), L*n].As can be seen that
User's delay inequality in every group is all in 0ms<Between L≤0.67ms, meet lead TA in existing LTE standard for 0~
0.67ms, so the user in satellite beams can be realized that uplink synchronisation communicates by group.
Further, each user's group distributes the signal for determining each user terminal UE in this group according to the scheduling of resource of satellite
Between up transmitting so that the time that the signal that different user groups are sent reaches satellite is different；So as to which satellite can be with time-division processing
The user data of different grouping.
Further, in same user's group, each user terminal UE adjusts the up transmission of self information according to TA adjustment information
Time so that the time that the information that all user terminal UE are sent in this group reaches satellite is identical.
And cause the information that all user terminal UE are sent in this group to reach the time identical method of satellite according to following step
It is rapid to carry out：
Any ground based terminal UE in (2-1) user's group is set as the first ground based terminal, determines first ground based terminal certainly
Beam information residing for body and own location information；
(2-2) receives the pilot signal of satellite launch, obtains the satellite almanac data at newest moment, and then when determining current
The satellite position information and beam center positional information at quarter；
(2-3) is calculated according to the first ground based terminal own location information and satellite position information, beam center positional information
The distance of first ground based terminal itself and satellite, beam center and satellite, obtains the signal that the first ground based terminal itself arrives satellite
The delay inequality of second time needed for the signal of the very first time needed for propagating and beam center to satellite is propagated；
(2-4) relative to the second ground based terminal at beam center position, the first ground based terminal delay inequality in advance
Duration send upward signal；By being timed adjustment to ground terminal transmission upward signal；
Each ground based terminal is handled according to step (2-1) to (2-4) in (2-5) same user's group, so that
The signal of each ground based terminal transmitting in same user's group reaches satellite simultaneously, realizes satellite reception end Timing Synchronization.
Further, the communication system of the satellite is LTE.
Further, in the step (2-3), terminal UE 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 ground based terminal UE positions
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 ground based terminal UE to the distance of satellite, drFor
Distance of the 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 applied to satellite based on the LTE that TA leads are grouped
The synchronous method of up-link, packet configuration TA leads are carried out by the round-trip delay difference transmitted according to user link, it is to avoid
TA setting scope in modification ground LTE protocol standard, and by ensureing that TA leads, in less scope, are improved
The validity and real-time of satellite communication.
Brief description of the drawings：
Fig. 1 is the schematic flow sheet of the inventive method；
Fig. 2 is the distribution map of the terrestrial user in a satellite beams.
Fig. 3 is that the information of user terminal UE transmissions in embodiment reaches the time identical flow chart of satellite.
Fig. 4 is that user terminal UE is relative position schematic diagram relative to the delay inequality calculating that beam center to satellite is transmitted.
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, a kind of LTE satellite uplink synchronous method being grouped based on TA leads, including
Following steps,
S1：According to the default random lead code of generation of the generation rule of random lead code in LTE protocol, user terminal UE transmitting bags
Signal containing the random lead code；
S2：When the link transmission that satellite calculates each user terminal UE to satellite according to the random lead code received comes and goes
Prolong；
S3：According to Timing Advance in the LTE system of ground (Timing Advance, TA) setting scope, in this model
One reasonable value L of interior selection is enclosed, the maximum that the L values should be as close as in the range of is so that the group number being divided into below is use up
It may lack, it is at least two user's groups to be divided each user terminal UE according to each user terminal UE to satellite round-trip delay；
S4：Satellite launches corresponding TA adjustment information to different user groups respectively；
S5：User in each user's group determines that information upstream sends the time according to the TA adjustment information received.
Whether up-link transmission is carried out with when carrying out up-link transmission, so that satellite reception end is to different grouping
Between carry out time-division processing, same group of different user and synchronously reach that satellite reception end is handled simultaneously.
Further, user terminal UE produces random lead code according to satellite orbital altitude, and satellite is random according to what is received
Lead code calculates each user terminal UE to the link transmission round-trip delay of satellite.
Further, the setting value L is all in the setting scope and satellite beams of ground LTE system TA leads connects
The maximum round trip delay inequality of access customer is determined；Its span is 0ms<L≤0.67ms.The group number after packet need to be made as far as possible
Less, the number of users in every group is as uniform as possible.So L can be with satellite orbital altitude, satellite beams size and satellite elevation angle
Adaptations are done etc. factor.
Further, it is by the method that each user terminal UE points are different user groups：Obtain in single satellite beams each
Maximum transmitted round-trip delay Ts of the user terminal UE to satellitea, interior each user terminal UE of the satellite beams is obtained to the minimum past of satellite
Return time delay Tb, calculate the maximum round trip delay inequality Δ t=T of all user terminal UE in the satellite beamsa-Tb；
According to formulaIt is n user's group by each user terminal UE in the satellite beams points；Each user's group
Round-trip delay between interior user terminal UE is both less than or equal to L；When then all users can be pressed minimum round relative at B
The user's delay inequality prolonged is divided into n groups, is respectively [0, L*1], and (L*1, L*2] ... (L* (n-1), L*n].As can be seen that
User's delay inequality in every group is all in 0ms<Between L≤0.67ms, meet lead TA in existing LTE standard for 0~
0.67ms, so the user in satellite beams can be realized that uplink synchronisation communicates by group.
Further, each user's group distributes the signal for determining each user terminal UE in this group according to the scheduling of resource of satellite
Between up transmitting so that the time that the signal that different user groups are sent reaches satellite is different；So as to which satellite can be with time-division processing
The user data of different grouping.
Further, in same user's group, each user terminal UE adjusts the up transmission of self information according to TA adjustment information
Time so that the time that the information that all user terminal UE are sent in this group reaches satellite is identical.
And cause the information that all user terminal UE are sent in this group to reach the time identical method of satellite according to such as Fig. 3 institutes
Show that step is carried out：Specifically include,
S21：In the same wave beam of satellite projects to ground, any ground based terminal UE in certain user's group is set as
One ground based terminal UE, the GPS location function that the first ground based terminal UE has by itself determines the positional information of itself, the position
Confidence breath includes but is not limited to longitude, latitude and height.Specifically, the ground based terminal refers to cover wave beam model in the satellite
The processing unit for being used to be communicated with the satellite in enclosing, some ground based terminals described in improved LTE accesses to defend
Star, the first ground based terminal UE refers to any one in some ground based terminals.
S22：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.
S23：The first ground based terminal UE calculates first ground based terminal with defending respectively according to the positional information obtained
The distance of star, and beam center position is to the distance of satellite, and then ground based terminal UE is tried to achieve to satellite and beam center to defending
The signal transmission delay of star is poor；Specifically, distance of the satellite to the first ground based terminal UE to satellite, or, beam center is to defending
Star 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 4.
S24：First ground based terminal UE calculates obtained delay inequality Δ τ according to step S23, relative to positioned at beam center position
Second ground based terminal at place is put, the duration of the delay inequality sends upward signal in advance.Specifically, ground based terminal UE sends up letter
Number 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.Pass through
Adjustment is timed to ground terminal transmission upward signal so that the signal of Different Ground terminal transmission reaches satellite simultaneously, it is real
Existing satellite reception end Timing Synchronization.
S25：Each ground based terminal is handled according to step (2-1) to (2-4) in same user's group, so that together
The signal of each ground based terminal transmitting in one user's group reaches satellite simultaneously, realizes satellite reception end Timing Synchronization.
Claims (10)
1. a kind of LTE satellite uplink synchronous method being grouped based on TA, it is characterised in that comprise the following steps,
Step one:According to the default random lead code of generation, user terminal UE launches the signal for including the random lead code；
Step 2：When the link transmission that satellite calculates each user terminal UE to satellite according to the random lead code received comes and goes
Prolong；
Step 3：According to the setting scope of Timing Advance in the LTE system of ground, a reasonable value L is selected within the range, according to
It is at least two user's groups that the round-trip delay of each user terminal UE to satellite, which divides each user terminal UE,；
Step 4：Satellite launches corresponding Timing Advance adjustment information to different user groups respectively；
Step 5：When user in each user's group determines that information upstream is sent according to the Timing Advance adjustment information received
Between.
2. the method as described in claim 1, it is characterised in that user segment UE produces random leading according to satellite orbital altitude
Code, satellite calculates each user terminal UE to the link transmission round-trip delay of satellite according to the random lead code received.
3. the method as described in claim 1, it is characterised in that the setting value L by ground LTE system TA leads setting
The maximum round trip delay inequality of all accessing users is determined in scope and satellite beams；Its span is 0ms<L≤0.67ms.
4. the method as described in claim 1, it is characterised in that be by the method that UE points of each user terminal is different user groups：
Obtain maximum transmitted round-trip delay Ts of each user terminal UE to satellite in single satellite beamsa, obtain in the satellite beams each
Minimum round-trip delay Ts of the user terminal UE to satelliteb, calculate the maximum round trip delay inequality of all user terminal UE in the satellite beams
Δ t=Ta-Tb；
According to formulaIt is n user's group by each user terminal UE in the satellite beams points；In each user's group
Round-trip delay between user terminal UE is both less than or equal to L.
5. the method as described in claim 1, it is characterised in that each user's group determines this according to the distribution of the scheduling of resource of satellite
Each user terminal UE signal uplink sends the time in group so that the signal that different user groups are sent reaches the time of satellite not
Together.
6. the method as described in claim 1, it is characterised in that in same user's group, each user terminal UE is according to timing advance
Measure the adjustment information adjustment self information up transmission time so that the information that all user terminal UE are sent in this group reaches satellite
Time is identical.
7. method as claimed in claim 6, it is characterised in that defended so that the information that all user terminal UE are sent in this group is reached
The time identical method of star is carried out in accordance with the following steps：
Any ground based terminal UE in (2-1) user's group is set as the first ground based terminal, determines itself institute of first ground based terminal
Locate beam information and own location information；
(2-2) receives the pilot signal of satellite launch, obtains the satellite almanac data at newest moment, and then determine current time
Satellite position information and beam center positional information；
(2-3) calculates first according to the first ground based terminal own location information and satellite position information, beam center positional information
The distance of ground based terminal itself and satellite, beam center and satellite, the signal for obtaining the first ground based terminal itself to satellite is propagated
The delay inequality of second time needed for the signal of the required very first time and beam center to satellite is propagated；
(2-4) relative to the second ground based terminal at beam center position, the first ground based terminal in advance the delay inequality when
Long hair send upward signal；By being timed adjustment to ground terminal transmission upward signal；
Each ground based terminal is handled according to step (2-1) to (2-4) in (2-5) same user's group, so that same
The signal of each ground based terminal transmitting in user's group reaches satellite simultaneously, realizes satellite reception end Timing Synchronization.
8. method as claimed in claim 7, it is characterised in that in the step (2-3), terminal UE or beam center are to satellite
Be apart from calculation formula：
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 is ground based terminal UE positions or ripple
Beam center position.
9. method as claimed in claim 7, it is characterised in that the delay inequality calculation formula is：
In formula, Δ τ is required delay inequality；C is the spread speed of light；D is ground based terminal UE to the distance of satellite, drFor wave beam
Distance of the center to satellite.
10. method as claimed in claim 7, it is characterised in that the positional information includes longitude, latitude and height.
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