CN104427571B - The mobile terminal switching method that a kind of GPS for time division synchronous system is assisted - Google Patents
The mobile terminal switching method that a kind of GPS for time division synchronous system is assisted Download PDFInfo
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- CN104427571B CN104427571B CN201310403686.4A CN201310403686A CN104427571B CN 104427571 B CN104427571 B CN 104427571B CN 201310403686 A CN201310403686 A CN 201310403686A CN 104427571 B CN104427571 B CN 104427571B
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- time
- sequence
- observation
- base station
- terminal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
Abstract
The present invention proposes a kind of mobile terminal switching method for time division synchronous system, including：A, the N number of time span of Base Transmitter are the observation sequence that the identical sequence units of T are composed in series, and N is more than or equal to 3；B, terminal observe the observation sequence of adjoining base station in the observation window that the time span for being located locally observation sequence middle is T, obtain time of measuring and deviate D1；C, terminal obtain itself position coordinates by GPS, calculate that itself is poor with the distance between home base stations and adjoining base station, and calculate reference time offset D2；D, positive and negative（N‑1）In the range of × T/2, the time value that the integral multiple of T will be differed with D1 forms a time migration set, and one and D2 offset difference is therefrom selected to be no more than the time value of predetermined threshold as real time offset D3；E, terminal are initiated to switch according to D3 to target BS.
Description
Technical field
The present invention relates to the mobile ends that wireless communication field more particularly to a kind of GPS for time division synchronous system are assisted
Hold switching method.
Background technology
It when mobile terminal switches, needs to measure adjacent cell signal, the intensity in addition to obtaining adjacent cell signal will also
Itself and the time delay relationship (i.e. time migration of the adjacent cell signal relative to this cell signal) between this cell signal are obtained, convenient for eventually
Complete switching in end.For time division synchronous system, existing switching method is when measuring often in observation window to adjacent cell base station
Transmitting sequence carries out the observation (before the sequential i.e. based on local sequence, observing some time backward) of a period of time, utilizes observation
The correlation of sequence and local sequence obtains its energy size and time migration.However in some broadband wireless communication networks,
Terminal high-speed moves and (is more than 1000km/h) and base distance between sites are often larger (200km or more), need at this time very big
Observation window could obtain and signal power and time migration are effectively estimated.This can cause terminal complexity higher, and by
It is terminal distribution resource in that cannot be occupied in range in observation window, can leads between strong influence terminal and this cell base station
Letter.
Invention content
In order to overcome prior art switching in terminal high-speed movement and big base distance between sites to need larger observation window
The problem of, the present invention provides a kind of mobile terminal switching method of GPS auxiliary, this method is especially set by observation sequence
Meter, can significantly reduce the length of terminal observation window, to reduce terminal complexity, improve frequency spectrum resource utilization rate.It should
Method includes the following steps：
A, the observation sequence that Base Transmitter is composed in series by the identical sequence units that N number of time span is T, N are more than or equal to
3；
B, terminal observe the observation sequence of adjoining base station transmitting in the observation window that time span is T, utilize what is observed
The correlation of observation sequence and local observation sequence obtains time of measuring and deviates D1, and the observation window is located locally observation sequence
Middle；
C, terminal obtain itself position coordinates by GPS, and obtain home base stations and adjoining base station by home base stations
Position coordinates, calculate that itself is poor with the distance between home base stations and adjoining base station, and the reference time is calculated according to the range difference
Deviate D2；
D, in the time range of positive and negative (N-1) × T/2, will be differed with D1 the integral multiple of T time value form one when
Between offset collection, select from this collection the offset difference of one and D2 be no more than the time value of predetermined threshold as it is practical when
Between deviate D3；
E, terminal are initiated to switch according to D3 to target BS.
Preferably, method of the invention is used for the time division synchronous system, such as McWiLL systems etc. of base station identical networking.
Preferably, the N of the above method is even number, and best value is 4.
Preferably, the time span T values of observation window are 64us.
Preferably, the predetermined threshold in step d is an empirical value estimated according to physical link environment, further
, when N, which is equal to 4, T, is equal to 64us, the predetermined threshold is 16us.
Compared with the prior art, the advantages of the present invention are as follows：1, terminal only needs the sequential based on local observation sequence to see
The window for surveying a minimum period, significantly reduces system complexity；2, terminal need not increase forward observation window backward
Length, therefore will not additionally occupy the call duration time with home base stations, reduce influence of the switching to traffic rate, improve
Frequency spectrum resource utilization rate.
Description of the drawings
Fig. 1 be embodiment one time migration be 24us when may actual shifts time diagram；
Fig. 2 be embodiment two time migration be 24us when may actual shifts time diagram；
Fig. 3 be embodiment three time migration be 24us when may actual shifts time diagram；
Fig. 4 be embodiment three time migration be -24us when may actual shifts time diagram.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with the accompanying drawings.
Embodiment one：Observation sequence includes 4 identical sequence units
The present embodiment is based on McWiLL systems, base station identical networking in the system, and the switching of mobile terminal realizes step such as
Under：
(1) base station sends the observation sequence that length is 256us in every frame starting position, and the sequence is by 4 identical 64us
Sequence units are composed in series；
(2) end side is synchronized by home base stations downlink synchronous signal, is abutted when accessing home base stations
Table information, wherein including position coordinates, the corresponding observation sequence number of each base station adjacent with home base stations, terminal also obtains simultaneously
The position coordinates of home base stations；
(3) each observation sequence to adjoining base station transmitting of terminal is observed, and observation window width is above-mentioned sequence
Minimum period 64us, the window are located at the middle section of entire observation sequence, i.e., are opened from the 97us of local 256us observation sequences
Begin, continuous observation 64us, until terminating at the 160us of our station 256us observation sequences；
(4) terminal physical layer utilizes the phase of the 64us sequences and local 64us observation sequences of each adjoining base station observed
Closing property estimates the signal strength of each adjoining base station, time of measuring offset, and reports to terminating layer three, due to only observing
64us, thus the time of measuring deviation range reported in -32us between 32us；
(5) terminating layer three selects observation sequence (these sights for wherein meeting power switched constraints from reported result
Sequencing arranges the handover-target base station that corresponding adjoining base station is to be selected)；
(6) since the time migration that layer one reports there may be ambiguity, such as the time migration reported is 24us, is such as schemed
Shown in 1, it is possible to which actual shifts are 88us (difference 64us) or -40us (difference -64us), therefore terminating layer three needs to construct
The set of one be possible to time migration therefrom carries out selection confirmation.For the observation sequence for meeting power switched constraints
Row calculate its time offset collection one by one, include 3 elements in the time migration set of each observation sequence of the present embodiment：Layer
One reporting measurement time migration, one reporting measurement time migration+64us of layer, one reporting measurement time migration -64us of layer；For example,
The observation sequence of serial number 2,6 meets power constraints simultaneously, then provides corresponding time migration collection respectively to sequence 2,6
It closes, 2 corresponding time migration set of sequence includes 2 time of measuring of the sequence offset that layer one reports, and the sequence 2 that layer one reports measures
Time migration+64us, the 2 time of measuring offset -64us of sequence that layer 2 reports；6 corresponding time migration collection of sequence includes on layer one
6 time of measuring of sequence of report deviates, the 6 time of measuring offset+64us of sequence that layer one reports, 2 time of measurement sequence that layer 6 reports
Offset -64us；
(7) terminating layer three calculates itself at a distance from home base stations according to the information that GPS module reports, and calculate itself with
Meet the distance between the corresponding base station of observation sequence of power constraint, then calculate the difference of the two distances, still with above-mentioned 2,6
For sequence, two base station location coordinates of corresponding sequence 2,6 are found from adjacency list, calculate separately terminal to home base stations away from
From with to the difference with a distance from two target BS, and then calculate separately to obtain the corresponding two reference times offset of 2,6 sequences；
(8) reference time offset is a theoretical value, has a small amount of error between real time offset, the error range
It can estimate to obtain according to physical link environment, the present embodiment is estimated as positive and negative 16us.Therefore terminating layer three judges time migration
Whether there is time value of the offset difference deviated with the reference time within 16us in set, if in the presence of, then it is assumed that the measurement
Effectively, while remembering the real time offset that the value is corresponding observation sequence；If being not present, then it is assumed that it is invalid to measure；
(9) from effective measure selection signal maximum intensity observation sequence, its corresponding neighbour practical is offset to according to it
It connects base station and initiates switching.
Embodiment two：Observation sequence includes 6 identical sequence units
The specific implementation step and embodiment one of the present embodiment are essentially identical, differ only in each observation sequence of the present embodiment
Include 5 elements in the time migration set of row.It is still assumed that the time migration reported is 24us, as shown in Fig. 2, the present embodiment
In to be possible to actual shifts be 88us (difference 64us), 152us (difference 128us), -40us (difference -64us) or -104us
(difference -128us), therefore include 5 elements in the time migration set of each observation sequence of the present embodiment：One reporting measurement of layer
Time migration, one reporting measurement time migration+64us of layer, one reporting measurement time migration+128us of layer, when one reporting measurement of layer
Between offset -64us, one reporting measurement time migration -128us of layer；These possible time migrations differ the integer of 64us with 24us
Times, it is no more than the range of positive and negative (6-1)/2 × 64us (i.e. positive and negative 160us).
Embodiment two：Observation sequence includes 5 identical sequence units
Observation sequence is designed as when including the identical sequence units of even number, and time offset collection is symmetrical, practical to realize
Come more convenient, but can also include the identical sequence of odd number the invention is not limited in comprising the identical sequence units of even number
Unit.
The present embodiment implements step and embodiment one is essentially identical, area for including 5 identical sequence units
It is not only that in the time migration set of each observation sequence of the present embodiment to include 4 elements.Assuming that the time migration reported is
24us, as shown in Figure 3, it is possible to which actual shifts are 88us (difference 64us), -40us (difference -64us) or -104us (phases
Difference -128us), it is further assumed that the time migration reported is -24us, as shown in Figure 4, it is possible to which actual shifts are 40us (differences
64us), -88us (difference -64us) or 104us (difference 128us).Although these possible time migrations are asymmetric, only
The integral multiple of 64us, and the range no more than positive and negative (5-1)/2 × 64us (i.e. positive and negative 128us) are differed with 24us.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (7)
1. the mobile terminal switching method that a kind of GPS for time division synchronous system is assisted, which is characterized in that the method includes
Following steps：
A, the observation sequence that Base Transmitter is composed in series by the identical sequence units that N number of time span is T, N are more than or equal to 3；
B, terminal observe the observation sequence of adjoining base station transmitting in the observation window that time span is T, utilize the observation observed
Sequence and the correlation of local observation sequence obtain time of measuring and deviate D1, and the observation window is being located locally observation sequence just
It is intermediate；
C, terminal obtain itself position coordinates by GPS, and the position of home base stations and adjoining base station is obtained by home base stations
Coordinate, calculates that itself is poor with the distance between home base stations and adjoining base station, and reference time offset is calculated according to the range difference
D2；
D, in the time range of positive and negative (N-1) × T/2, time value one time of composition that the integral multiple of T will be differed with D1 is inclined
Set is moved, selects one and D2 offset difference inclined as the real time no more than the time value of predetermined threshold from this collection
Move D3；
E, terminal are initiated to switch according to D3 to target BS, the observation sequence of selection signal maximum intensity, root from effective measure
Switching is initiated according to its practical its corresponding adjoining base station that offsets to.
2. method according to claim 1, which is characterized in that base station identical networking.
3. method according to claim 1 or claim 2, which is characterized in that N is even number.
4. method according to claim 3, which is characterized in that N is equal to 4.
5. method according to claim 1 or claim 2, which is characterized in that T is equal to 64us.
6. method according to claim 1 or claim 2, which is characterized in that the predetermined threshold is one according to physical link ring
The empirical value of border estimation.
7. method according to claim 6, which is characterized in that N is equal to 4, T and is equal to 64us, and the predetermined threshold is 16us.
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| CN201310403686.4A CN104427571B (en) | 2013-09-06 | 2013-09-06 | The mobile terminal switching method that a kind of GPS for time division synchronous system is assisted |
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| CN106686665B (en) * | 2015-11-09 | 2019-12-17 | 北京信威通信技术股份有限公司 | method and device for increasing switching distance |
| CN113194402A (en) * | 2021-04-02 | 2021-07-30 | 天地（常州）自动化股份有限公司 | Underground vehicle single-station direction determination method based on accurate positioning |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244907A (en) * | 2010-05-14 | 2011-11-16 | 北京信威通信技术股份有限公司 | Quick switching method and device for radio communication |
| CN102917421A (en) * | 2011-08-05 | 2013-02-06 | 北京信威通信技术股份有限公司 | Method and system for realizing rapid switching in communication network |
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| EP1890398B1 (en) * | 2005-06-09 | 2013-08-21 | Mitsubishi Denki Kabushiki Kaisha | Mobile radio communication system, base station apparatus, radio network controller and mobile station |
| KR100677604B1 (en) * | 2005-07-27 | 2007-02-02 | 삼성전자주식회사 | Method and mobile device for performing fast hand-over in wireless LAN, and method of switching services using GPS information |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244907A (en) * | 2010-05-14 | 2011-11-16 | 北京信威通信技术股份有限公司 | Quick switching method and device for radio communication |
| CN102917421A (en) * | 2011-08-05 | 2013-02-06 | 北京信威通信技术股份有限公司 | Method and system for realizing rapid switching in communication network |
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