CN106507472A - A kind of localization method in wireless communication system - Google Patents
A kind of localization method in wireless communication system Download PDFInfo
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- CN106507472A CN106507472A CN201510563753.8A CN201510563753A CN106507472A CN 106507472 A CN106507472 A CN 106507472A CN 201510563753 A CN201510563753 A CN 201510563753A CN 106507472 A CN106507472 A CN 106507472A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention proposes the localization method in a kind of wireless communication system, including：Distance of the network side according to the adjacent cell of targeted customer, is the adjacent cell distribution physical vlan cell ID PCI；The Virtual PC I is sent to the targeted customer and adjacent cell；The adjacent cell produces location reference signals PRS according to the Virtual PC I and sends；The targeted customer carries out the measurement of reference signal reaching time-difference RSTD to the PRS, and reports；Network side is positioned to the targeted customer according to the RSTD measurement results.The present invention distributes different Virtual PC I according to the distance of different adjacent cells to targeted customer, and adjacent cell generates PRS signals using Virtual PC I, reduces the effect of signal interference, realizes hi-Fix.
Description
Technical field
The present invention relates to the localization method in wireless communication field, more particularly to a kind of wireless communication system.
Background technology
In recent years, with the fast development of mobile Internet, presented based on the application of customer location huge
Commercial value, high-precision terminal positioning technology are received significant attention.At present, third generation partner program
(3rd Generation Partnership Project, referred to as 3GPP) member is to the positioning under different scenes and increasing
Strong technology is discussed, and progressively makes the positioning enhanced scheme of suitable different scenes, to meet different answering
Use demand.
In Long Term Evolution (Long Term Evolution, abbreviation LTE) system, user equipment (User
Equipment, abbreviation UE) localization method have many kinds, one of which is observation reaching time-difference
(Observed Time Difference of Arrival, abbreviation OTDOA) localization method.OTDOA is fixed
Position basic thought be：Multiple base stations send location reference signals (Position Reference Signal, letter
Claim PRS), reference signal reaching time-difference (Reference Signal Time different base station sent by UE
Difference, abbreviation RSTD) measure；In the positioning mode based on UE, UE receives network
The positioning auxiliary information for issuing, in conjunction with OTDOA measurement results, realizes being accurately positioned；In UE auxiliary
In positioning mode, OTDOA measurement results are reported to UE the enhanced terminal positioning center of network side
(Enhanced Serving Mobile Location Centre, abbreviation E-SMLC), is carried out by E-SMLC
The calculating of UE positions.
Search and rescue in scene in some scenes such as accident, need hi-Fix to be carried out to particular UE.However,
In current LTE system, the generation of PRS signals is based on physical-layer cell ID (Physical Cell
Identity, abbreviation PCI), and the distribution of PCI does not consider the impact to positioning.When multiple cells are adopted
During with identical PRS resource allocation modes, UE hardly results in accurate RSTD.And, if desired to spy
Determining UE carries out hi-Fix, at present without effective measures.
Content of the invention
For the problems referred to above, the present invention proposes the localization method in a kind of wireless communication system, including：
Distance of the network side according to the adjacent cell of targeted customer, is the adjacent cell distribution physical vlan
Cell ID PCI；The Virtual PC I is sent to the targeted customer and adjacent cell；
The adjacent cell produces location reference signals PRS according to the Virtual PC I and sends；
The targeted customer carries out the measurement of reference signal reaching time-difference RSTD to the PRS, and reports；
Network side is positioned to the targeted customer according to the RSTD measurement results.
Further, described according to the Virtual PC I produce location reference signals PRS include：
Generate PRS initiation sequences：
First initiation sequence is x1(0)=1, x1(n)=0, n=1,2 ..., 30,
Second initiation sequence be
Wherein： For cell virtual PCI；
Pseudo-random sequence is generated, pseudo-random sequence is generated by the Gold sequence that length is 31, is output as length
MPNSequence c (n)：
C (n)=(x1(n+NC)+x2(n+NC))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein, wherein n=0,1 ..., MPN- 1, NC=1600；
PRS sequential elementsGenerate as the following formula：
Wherein ns∈ { 0,1 } is timeslot number, and l is the OFDM symbol label in time slot.
Further, also include：Range estimation institute of the network side according to the adjacent cell of the targeted customer
Adjacent cell PRS is stated to the time of advent of the targeted customer, and is sent to the time of advent described
Targeted customer.
Further, also include：To the Serving cell in the adjacent cell, network side is according to the service
The timing advance TA value of the targeted customer that cell is provided estimates the Serving cell PRS to the target
The time of advent of user, and the time of advent is sent to the targeted customer.
Further, described reference signal reaching time-difference RSTD measurement is carried out to the PRS include：
The time of advent according to network side estimation generates expects RSTD value, determines search window size；
PRS signals are generated according to Virtual PC I, the PRS signals for receiving are entered with the PRS signals for generating
Row time domain cross-correlation calculation；
Search window according to the determination carries out peakvalue's checking, obtains accurate RSTD measurement results.
Further, the distance of the adjacent cell of the targeted customer is obtained in the following way：
Receive adjacent cell Reference Signal Received Power RSRP and PCI that the targeted customer reports；
According to the initial position that the RSRP estimates the targeted customer；
According to the distance that the initial position calculates the adjacent cell of the targeted customer.
Further, the initial position of the estimation targeted customer includes：Tested cell PCI is mapped
For position coordinateses, in conjunction with the RSRP measured values that the targeted customer reports, determining based on received signal strength
Position algorithm estimates the initial position of the targeted customer.
Further, also include：The cell for selecting RSRP maximum or the Serving cell of the targeted customer are made
For positioning reference cell.
Further, described positioning is carried out to the targeted customer according to the RSTD measurement results include：
The RSTD measurement results are carried out to the position of the targeted customer using the iterative algorithm of Taylor expansion
Estimation, the initial value of the iterative algorithm is using the initial position message according to RSRP estimations.
Further, the RSRP is single measurements or the statistical value in a period of time.
The present invention distributes different PRS resources by the adjacent cell to target UE, reduces interference
Purpose, so that obtain accurate RSTD measured values, it is achieved that UE is accurately positioned.
Description of the drawings
Fig. 1 is the process flow block diagram of localization method proposed by the present invention；
Fig. 2 is the LTE beehive network system schematic diagrams that the embodiment of the present invention is adopted.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention is clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, to the embodiment of the present invention in technical scheme be clearly and completely described, it is clear that
Described embodiment is a part of embodiment of the invention, rather than whole embodiments；It should be noted that
In the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.
One embodiment of the present of invention proposes the localization method in a kind of wireless communication system, refer to Fig. 1,
Comprise the steps：
Distance of the network side according to the adjacent cell of targeted customer, is the adjacent cell distribution physical vlan
Cell ID PCI；The Virtual PC I is sent to the targeted customer and adjacent cell；
The adjacent cell produces location reference signals PRS according to the Virtual PC I and sends；
The targeted customer carries out the measurement of reference signal reaching time-difference RSTD to the PRS, and reports；
Network side is positioned to the targeted customer according to the RSTD measurement results.
In one alternate embodiment, described according to Virtual PC I generation location reference signals PRS bags
Include：
Generate PRS initiation sequences：
First initiation sequence is x1(0)=1, x1(n)=0, n=1,2 ..., 30,
Second initiation sequence be
Wherein： For cell virtual PCI；
Pseudo-random sequence is generated, pseudo-random sequence is generated by the Gold sequence that length is 31, is output as length
MPNSequence c (n)：
C (n)=(x1(n+NC)+x2(n+NC))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein, wherein n=0,1 ..., MPN- 1, NC=1600；
PRS sequential elementsGenerate as the following formula：
Wherein ns∈ { 0,1 } is timeslot number, and l is the OFDM symbol label in time slot.
In one alternate embodiment, also include：Network side is according to the adjacent cell of the targeted customer
The times of advent of the adjacent cell PRS to the targeted customer described in range estimation, and by the time of advent
It is sent to the targeted customer.
In one alternate embodiment, also include：To the Serving cell in the adjacent cell, network lateral root
The timing advance TA value of the targeted customer provided according to the Serving cell estimates the Serving cell PRS
To the time of advent of the targeted customer, and the time of advent is sent to the targeted customer.
In one alternate embodiment, described reference signal reaching time-difference RSTD is carried out to the PRS
Measurement includes：
The time of advent according to network side estimation generates expects RSTD value, determines search window size；
PRS signals are generated according to Virtual PC I, the PRS signals for receiving are entered with the PRS signals for generating
Row time domain cross-correlation calculation；
Search window according to the determination carries out peakvalue's checking, obtains accurate RSTD measurement results.
In one alternate embodiment, the distance of the adjacent cell of targeted customer is obtained in the following way：
Receive adjacent cell Reference Signal Received Power RSRP and PCI that the targeted customer reports；
According to the initial position that the RSRP estimates the targeted customer；
According to the distance that the initial position calculates the adjacent cell of the targeted customer.
In one alternate embodiment, the initial position of the estimation targeted customer includes：Will be tested little
Area PCI is mapped as position coordinateses, in conjunction with the RSRP measured values that the targeted customer reports, is believed based on receiving
The location algorithm of number intensity estimates the initial position of the targeted customer.
In one alternate embodiment, also include：The cell that selects RSRP maximum or the targeted customer's
Serving cell is used as positioning reference cell.
In one alternate embodiment, the targeted customer is positioned according to the RSTD measurement results
Including：Position of the iterative algorithm of Taylor expansion to the targeted customer is adopted to the RSTD measurement results
Estimated, the initial value of the iterative algorithm is using the initial position message according to RSRP estimations.
In one alternate embodiment, the RSRP is single measurements or the statistical value in a period of time.
In various embodiments above, distance of the network side according to different adjacent cells to targeted customer, distribution is not
Same Virtual PC I, adjacent cell generate PRS signals using Virtual PC I, reduce the work of signal interference
With realizing hi-Fix.On the other hand, targeted customer carries out RSRP measurements to adjacent cell, passes through
RSRP is measured and is reported, and network side can obtain the initial position of targeted customer, and the position can conduct
The initial estimation result of OTDOA positioning, and the initial position can be also used for calculating difference adjacent to little
The distance in area.
For making technical scheme and advantage clearer, below citing is completely retouched to the present invention
State.
Assume that a LTE beehive network system being made up of 19 cells, targeted customer are located at cell 0
In coverage, Fig. 2 is refer to.The program is applicable not only to existing LTE system positioning scene, and
It is applied to any positioning scene based on the reference signal difference measurements time of advent.Concrete steps include：
Step 1, the lateral targeted customer of network initiate Location Request, and request message is passed to by LPP agreements
Targeted customer；
Step 2, after targeted customer receives Location Request, the cell-specific that measure neighbor cells send is with reference to letter
Number (Cell-specific Reference Signal, abbreviation CRS) signal, reference for obtaining different districts are believed
Number receiving power (Reference Signal Receiving Power, abbreviation RSRP), and by measurement result with
The PCI of tested cell reports network side；Additionally, targeted customer also can periodic measurement adjacent cell
RSRP, after Location Request is received, targeted customer can be by the meansigma methodss of the RSRP for measuring several times recently
Network side is reported, reduces the error that channel multipath fading is caused.
Step 3, reporting information of the network side according to targeted customer, the cell for selecting RSRP maximum is used as fixed
Position reference cell；Furthermore, it is possible to Serving cell to be fixed as positioning reference cell；
Step 4, the PCI of by the network side tested cell reported by targeted customer are mapped as position coordinateses, and
The RSRP measured values of combining target reporting of user, using the location algorithm based on received signal strength (as most
Little square law etc.) estimate the initial position of targeted customer；
Step 5, network side calculate the distance of different tested cells and user's initial position, estimate tested little
The time of advent of the PRS signals in area to targeted customer；
If Serving cell of the tested cell comprising targeted customer, the Serving cell can provide determining for targeted customer
Shi Tiqian (Timing Advance, abbreviation TA) value, the TA values can be used to estimate that the cell is used to target
The time of advent at family；In the isomery scene of carrier aggregation, targeted customer has multiple Serving cells, therefore may be used
To obtain the TA values of multiple cells, for estimating multiple cells to the time of advent of targeted customer；
Step 6, distance of the network side using tested cell and the user's initial position that estimates, according to distance by
Little to senior general's ranking cells, be that the cell after sequence distributes Virtual PC I values in order；
Step 7, the lateral targeted customer of network send OTDOA positioning auxiliary informations, and auxiliary information includes walking
The time of advent of the tested cell PRS signal obtained in rapid 5 to targeted customer, and obtain in step 6
The Virtual PC I values of tested cell；
Virtual PC I allocation result is passed to tested cell by step 8, network side；
Step 9, adjacent cell generate PRS signals according to the Virtual PC I for obtaining and send, and generation method is：
Assume that cell virtual PCI isFirstly generate PRS initiation sequences：
First initiation sequence is x1(0)=1, x1(n)=0, n=1,2 ..., 30, second initiation sequence is expressed asWhereinAnd
Pseudo-random sequence c (i) is generated, pseudo-random sequence is generated by the Gold sequence that length is 31, is output as
Length MPNSequence c (n), n=0,1 ..., MPN- 1, it is defined as follows：
C (n)=(x1(n+NC)+x2(n+NC))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein, NC=1600.
Then PRS sequential elementsCan generate as the following formula：
Wherein ns∈ { 0,1 } is timeslot number, and l is the OFDM symbol label in time slot.
Step 10, targeted customer carry out RSTD according to the OTDOA auxiliary informations docking collection of letters number for receiving
Measurement result is reported network side by measurement, and concrete measuring method includes：
A) according to the time of advent of different tested cells, generate and expect RSTD value, and according to the RSTD
Value determines the size of search window；
B PRS signals are generated according to the Virtual PC I of tested cell), signal will be received and entered with PRS signals
Row time domain cross-correlation calculation；
C) search window according to determined by carries out peakvalue's checking, so as to obtain accurate RSTD measurement results.
Step 11, after network side receives RSTD measurement data, using the iterative algorithm based on Taylor expansion
Calculated, obtained location estimation result, the initial position of Taylor algorithm can be adopted gained in step 4
Initial position co-ordinates.
The present invention is applied to any positioning scene based on the reference signal difference measurements time of advent.Network side according to
Distance of the different adjacent cells to targeted customer, distributes different Virtual PC I, and adjacent cell utilizes Virtual PC I
PRS signals are generated, the effect of signal interference is reduced, is realized hi-Fix.
Claims (10)
1. the localization method in a kind of wireless communication system, it is characterised in that include：
Distance of the network side according to the adjacent cell of targeted customer, is the adjacent cell distribution physical vlan
Cell ID PCI, and the allocation result of the Virtual PC I is notified to the targeted customer and adjacent cell；
The adjacent cell produces location reference signals PRS according to the Virtual PC I and sends；
The targeted customer carries out the measurement of reference signal reaching time-difference RSTD to the PRS, and reports；
Network side is positioned to the targeted customer according to the RSTD measurement results.
2. method according to claim 1, it is characterised in that described produced according to the Virtual PC I
Raw location reference signals PRS includes：
Generate PRS initiation sequences：
First initiation sequence is x1(0)=1, x1(n)=0, n=1,2 ..., 30,
Second initiation sequence be
Wherein： For cell virtual PCI；
Pseudo-random sequence is generated, pseudo-random sequence is generated by the Gold sequence that length is 31, is output as length
MPNSequence c (n)：
C (n)=(x1(n+NC)+x2(n+NC))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein, wherein n=0,1 ..., MPN- 1, NC=1600；
PRS sequential elementsGenerate as the following formula：
Wherein ns∈ { 0,1 } is timeslot number, and l is the OFDM symbol label in time slot.
3. method according to claim 1, it is characterised in that also include：Network side is according to described
Arrival of the adjacent cell PRS to the targeted customer described in the range estimation of the adjacent cell of targeted customer
Time, and the time of advent is sent to the targeted customer.
4. method according to claim 1, it is characterised in that also include：To the adjacent cell
In Serving cell, timing advance TA of the targeted customer that network side is provided according to the Serving cell
Value estimates the Serving cell PRS to the time of advent of the targeted customer, and the time of advent is sent out
Give the targeted customer.
5. the method according to claim 3 or 4, it is characterised in that described the PRS is carried out
Reference signal reaching time-difference RSTD measurement includes：
The time of advent according to network side estimation generates expects RSTD value, determines search window size；
PRS signals are generated according to Virtual PC I, the PRS signals for receiving are entered with the PRS signals for generating
Row time domain cross-correlation calculation；
Search window according to the determination carries out peakvalue's checking, obtains accurate RSTD measurement results.
6. the method according to Claims 1 to 5 any one, it is characterised in that the targeted customer
The distance of adjacent cell is obtained in the following way：
Receive adjacent cell Reference Signal Received Power RSRP and PCI that the targeted customer reports；
According to the initial position that the RSRP estimates the targeted customer；
According to the distance that the initial position calculates the adjacent cell of the targeted customer.
7. method according to claim 6, it is characterised in that the estimation targeted customer's
Initial position includes：Tested cell PCI is mapped as position coordinateses, is reported in conjunction with the targeted customer
RSRP measured values, based on the initial position that the location algorithm of received signal strength estimates the targeted customer.
8. method according to claim 6, it is characterised in that also include：Select RSRP maximum
Cell or the targeted customer Serving cell as positioning reference cell.
9. method according to claim 6, it is characterised in that described measured according to the RSTD
As a result carrying out positioning to the targeted customer includes：The RSTD measurement results are changed using Taylor expansion
The position of the targeted customer is estimated for algorithm, the initial value of the iterative algorithm adopts basis
The initial position message of RSRP estimations.
10. method according to claim 6, it is characterised in that the RSRP is single measurements
Or the statistical value in a period of time.
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| WO2019141090A1 (en) * | 2018-01-19 | 2019-07-25 | 电信科学技术研究院有限公司 | Positioning method and related device |
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| CN112449370A (en) * | 2019-08-30 | 2021-03-05 | 华为技术有限公司 | Positioning method and communication device |
| CN112771396A (en) * | 2018-10-05 | 2021-05-07 | 高通股份有限公司 | Simplified cell location information sharing for positioning purposes |
| CN113411880A (en) * | 2021-06-17 | 2021-09-17 | 中信科移动通信技术股份有限公司 | Wireless network uplink synchronization method and system |
| CN113796100A (en) * | 2019-05-02 | 2021-12-14 | 三星电子株式会社 | Apparatus and method for locating terminal in wireless communication system |
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Application publication date: 20170315 |