CN104427571A - GPS (Global Positioning System)-aided mobile-terminal switching method for time-division synchronous system - Google Patents
GPS (Global Positioning System)-aided mobile-terminal switching method for time-division synchronous system Download PDFInfo
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- CN104427571A CN104427571A CN201310403686.4A CN201310403686A CN104427571A CN 104427571 A CN104427571 A CN 104427571A CN 201310403686 A CN201310403686 A CN 201310403686A CN 104427571 A CN104427571 A CN 104427571A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- 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
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- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a GPS (Global Positioning System)-aided mobile-terminal switching method for a time-division synchronous system. The method comprises the following steps of a, transmitting an observation sequence which is formed by connecting N identical sequence units with the time length of T in series by a base station, wherein the N is greater than or equal to 3; b, observing the observation sequence of an adjacent base station by a terminal at an observation window which is positioned in the middle of a local observation sequence and has the time length of T to obtain a measuring-time offset D1; c, acquiring own position coordinates by the terminal through a GPS, calculating the distance differences of the terminal and a local base station as well as the adjacent base station, and calculating a reference-time offset D2; d, forming a time-offset set by integral multiples of time values which differ from D1 by T within the range of +/-(N-1)*T/2, and selecting a time value of which the offset difference value from D2 does not exceed a preset threshold value as an actual time offset D3; initiating switching to a target base station according to D3 by the terminal.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to the mobile terminal changing method that a kind of GPS for time division synchronous system is auxiliary.
Background technology
When mobile terminal switches, need to measure adjacent cell signal, except obtaining the intensity of adjacent cell signal, also by obtaining the time delay relation (namely adjacent cell signal is relative to the time migration of this cell signal) between itself and this cell signal, being convenient to terminal and completing switching.For time division synchronous system, existing changing method often carries out the observation (before the sequential based on local sequence, observing the some time backward) of a period of time at observation window to adjacent cell Base Transmitter sequence when measuring, and utilizes the correlation of observation sequence and local sequence to obtain its energy size and time migration.But in some broadband wireless communication networks, terminal high-speed moves (being greater than 1000km/h) and base station spacing often comparatively large (more than 200km), now need very large observation window, the effective estimation to signal power and time migration could be obtained.This can cause terminal complexity higher, and is terminal distribution resource owing to can not take in scope at observation window, can affect the communication between terminal and this cell base station greatly.
Summary of the invention
The problem needing larger observation window is switched when terminal high-speed moves and base station spacing is large in order to overcome prior art, the invention provides the mobile terminal changing method that a kind of GPS is auxiliary, the method is by the special design of observation sequence, significantly can reduce the length of terminal observation window, thus reduction terminal complexity, submit frequency spectrum resource utilization rate to.The method comprises the following steps:
A, the observation sequence that the identical sequence units in series that Base Transmitter is T by N number of time span forms, N is more than or equal to 3;
B, the observation sequence that the observation window observation adjoining base station that terminal is T in time span is launched, utilize the correlation of observation sequence and the local observation sequence observed to obtain Measuring Time and offset D1, described observation window is positioned at the middle of local observation sequence;
C, terminal obtains self position coordinates by GPS, and obtains the position coordinates of home base stations and adjoining base station by home base stations, calculates self and the range difference between home base stations and adjoining base station, according to described range difference computing reference time migration D2;
D, in the time range of positive and negative (N-1) × T/2, forms a time migration set by the time value of the integral multiple differing T with D1, and the time value selecting and the skew difference of D2 to be no more than predetermined threshold from this set offsets D3 as the real time;
E, terminal is initiated to switch to target BS according to D3.
Preferably, method of the present invention is used for the time division synchronous system of base station identical networking, such as McWiLL system etc.
Preferably, the N of said method is even number, and best value is 4.
Preferably, the time span T value of observation window is 64us.
Preferably, the predetermined threshold in steps d be one according to physical link environment estimate empirical value, further, when N equal 4, T equal 64us time, described predetermined threshold is 16us.
Compared with prior art, the invention has the advantages that: 1, terminal only needs the sequential based on local observation sequence to observe the window of a minimum period, significantly reduces system complexity; 2, terminal does not need the length strengthening forward observation window backward, therefore additionally can not take the call duration time with home base stations, reduces the impact switched traffic rate, improves frequency spectrum resource utilization rate.
Accompanying drawing explanation
Fig. 1 is the time migration of embodiment one when being 24us may the time diagram of actual shifts;
Fig. 2 is the time migration of embodiment two when being 24us may the time diagram of actual shifts;
Fig. 3 is the time migration of embodiment three when being 24us may the time diagram of actual shifts;
Fig. 4 is the time migration of embodiment three when being-24us may the time diagram of actual shifts.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Embodiment one: observation sequence comprises 4 identical sequence unit
The present embodiment based on McWiLL system, base station identical networking in this system, the switching performing step of mobile terminal is as follows:
(1) base station sends length in every frame starting position is the observation sequence of 256us, and this sequence is composed in series by 4 identical 64us sequence units;
(2) end side obtains synchronous by home base stations downlink synchronous signal, adjacency list information is obtained when accessing home base stations, wherein comprise the position coordinates of each base station adjacent with home base stations, corresponding observation sequence number, terminal also obtains the position coordinates of home base stations simultaneously;
(3) terminal each to adjoining base station launch observation sequence observe, observation window width is the minimum period 64us of above-mentioned sequence, this window is positioned at the mid portion of whole observation sequence, namely from the 97us place of local 256us observation sequence, Continuous Observation 64us, the 160us place to our station 256us observation sequence terminates;
(4) terminal physical layer utilizes the signal strength signal intensity of each adjoining base station of correlation estimation of the 64us sequence of each adjoining base station observed and local 64us observation sequence, Measuring Time offsets, and report to terminating layer three, owing to only observing 64us, the Measuring Time deviation range therefore reported is between-32us to 32us;
(5) terminating layer three selects the observation sequence (adjoining base station that these observation sequences are corresponding is handover-target base station to be selected) wherein meeting power switched constraints from reported result;
(6) likely there is ambiguity in the time migration reported due to layer one, the time migration such as reported is 24us, as shown in Figure 1, likely actual shifts is that 88us(differs 64us) or-40us(difference-64us), therefore terminating layer three need structure one the set of likely time migration, therefrom carry out selection and confirm.For the observation sequence meeting power switched constraints, calculate its time offset collection one by one, 3 elements are comprised: the time migration of layer one reporting measurement in the time migration set of each observation sequence of the present embodiment, layer one reporting measurement time migration+64us, layer one reporting measurement time migration-64us; Such as, sequence number be 2,6 observation sequence meet power constraints simultaneously, then corresponding time migration set is provided respectively to sequence 2,6, the time migration set of sequence 2 correspondence comprises the sequence 2 Measuring Time skew that layer one reports, the sequence 2 Measuring Time skew+64us that layer one reports, the sequence 2 Measuring Time skew-64us that layer 2 reports; The time migration collection of sequence 6 correspondence comprises the sequence 6 Measuring Time skew that layer one reports, the sequence 6 Measuring Time skew+64us that layer one reports, the measurement sequence 2 time migration-64us that layer 6 reports;
(7) information that terminating layer three reports according to GPS module calculates the distance of self and home base stations, and the distance calculated between self base station corresponding with the observation sequence meeting power constraint, then the difference of these two distances is calculated, still for above-mentioned 2,6 sequences, two base station location coordinates of corresponding sequence 2,6 are found from adjacency list, respectively computing terminal is to home base stations distance and the difference to two target BS distances, and then calculates two reference times that 2,6 sequence pair answer respectively and offset;
(8) reference time skew be a theoretical value, and the real time offset between have a small amount of error, this error range can according to physical link environment estimation draw, the present embodiment is estimated as positive and negative 16us.Therefore terminating layer three judges whether there be the time value of skew difference within 16us with reference time skew in time migration set, if exist, then thinks that this measurement is effective, remembers that this value is the real time skew of corresponding observation sequence simultaneously; If do not exist, then think that measurement is invalid;
(9) observation sequence selecting signal strength signal intensity maximum from effectively measure, initiates to switch according to its actual adjoining base station offseting to its correspondence.
Embodiment two: observation sequence comprises 6 identical sequence unit
The specific implementation step of the present embodiment is substantially identical with embodiment one, and difference is only to comprise 5 elements in the time migration set of each observation sequence of the present embodiment.Still suppose that the time migration reported is 24us, as shown in Figure 2, in the present embodiment, likely actual shifts is that 88us(differs 64us), 152us(differs 128us) ,-40us(difference-64us) or-104us(difference-128us), 5 elements are comprised: the time migration of layer one reporting measurement in the time migration set of therefore each observation sequence of the present embodiment, layer one reporting measurement time migration+64us, layer one reporting measurement time migration+128us, layer one reporting measurement time migration-64us, layer one reporting measurement time migration-128us; These possible time migrations differ the integral multiple of 64us with 24us, be no more than positive and negative (6-1)/2 × 64us(and positive and negative 160us) scope.
Embodiment two: observation sequence comprises 5 identical sequence unit
When observation sequence is designed to comprise even number identical sequence unit, its offset collection symmetrical time, actually implements more convenient, but the present invention is not limited to and comprises even number identical sequence unit, also can comprise odd number identical sequence unit.
The present embodiment is to comprise 5 identical sequence unit, and its specific implementation step is substantially identical with embodiment one, and difference is only to comprise 4 elements in the time migration set of each observation sequence of the present embodiment.Suppose that the time migration reported is 24us, as shown in Figure 3, likely actual shifts be 88us(differ 64us) ,-40us(difference-64us) or-104us(difference-128us), suppose that the time migration reported is-24us again, as shown in Figure 4, likely actual shifts be 40us(differ 64us) ,-88us(difference-64us) or 104us(differ 128us).Although these possible time migrations are asymmetric, as long as differ the integral multiple of 64us with 24us, and be no more than positive and negative (5-1)/2 × 64us(and positive and negative 128us) scope.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1., for the mobile terminal changing method that the GPS of time division synchronous system is auxiliary, it is characterized in that, said method comprising the steps of:
A, the observation sequence that the identical sequence units in series that Base Transmitter is T by N number of time span forms, N is more than or equal to 3;
B, the observation sequence that the observation window observation adjoining base station that terminal is T in time span is launched, utilize the correlation of observation sequence and the local observation sequence observed to obtain Measuring Time and offset D1, described observation window is positioned at the middle of local observation sequence;
C, terminal obtains self position coordinates by GPS, and obtains the position coordinates of home base stations and adjoining base station by home base stations, calculates self and the range difference between home base stations and adjoining base station, according to described range difference computing reference time migration D2;
D, in the time range of positive and negative (N-1) × T/2, forms a time migration set by the time value of the integral multiple differing T with D1, and the time value selecting and the skew difference of D2 to be no more than predetermined threshold from this set offsets D3 as the real time;
E, terminal is initiated to switch to target BS according to D3.
2. method according to claim 1, is characterized in that, base station identical networking.
3. method according to claim 1 or 2, is characterized in that, N is even number.
4. method according to claim 3, it is characterized in that, N equals 4.
5. method according to claim 1 or 2, is characterized in that, T equals 64us.
6. method according to claim 1 or 2, is characterized in that, described predetermined threshold is an empirical value estimated according to physical link environment.
7. method according to claim 6, it is characterized in that, N equals 4, T and equals 64us, and described predetermined threshold is 16us.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686665A (en) * | 2015-11-09 | 2017-05-17 | 北京信威通信技术股份有限公司 | Method and device for lengthening 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006131977A1 (en) * | 2005-06-09 | 2006-12-14 | Mitsubishi Denki Kabushiki Kaisha | Mobile wireless communication system, base station apparatus, wireless network control apparatus and mobile station apparatus |
| US20070025293A1 (en) * | 2005-07-27 | 2007-02-01 | Samsung Electronics Co., Ltd. | Method and mobile device for performing fast hand-over in WLAN and method of switching services using GPS information |
| 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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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006131977A1 (en) * | 2005-06-09 | 2006-12-14 | Mitsubishi Denki Kabushiki Kaisha | Mobile wireless communication system, base station apparatus, wireless network control apparatus and mobile station apparatus |
| US20070025293A1 (en) * | 2005-07-27 | 2007-02-01 | Samsung Electronics Co., Ltd. | Method and mobile device for performing fast hand-over in WLAN and method of switching services using GPS information |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686665A (en) * | 2015-11-09 | 2017-05-17 | 北京信威通信技术股份有限公司 | Method and device for lengthening switching distance |
| 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 |
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