CN100448302C - Delivering method for wireless communication system - Google Patents
Delivering method for wireless communication system Download PDFInfo
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- CN100448302C CN100448302C CNB2004100785408A CN200410078540A CN100448302C CN 100448302 C CN100448302 C CN 100448302C CN B2004100785408 A CNB2004100785408 A CN B2004100785408A CN 200410078540 A CN200410078540 A CN 200410078540A CN 100448302 C CN100448302 C CN 100448302C
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Abstract
The present invention relates to a delivering method for wireless communication systems, which is used for delivering a mobile device from a first base station to a second base station. Firstly, a first signal power of the mobile device and the first base station and a second signal power of the mobile device and the second base station are respectively measured by the mobile device; secondly, the first signal power and the second signal power are compared, and if the first signal power and the second signal power are substantially the same, equal signal power is generated; thirdly, a delivering power value which is between the values of the equal signal power and the lowest power is generated. When the value of the signal power of the mobile device and the first base station measured by the mobile device is the delivering power value, the mobile device is delivered to the second base station.
Description
Technical field
The present invention relates to a kind of changing method, and be particularly related to a kind of changing method that is used for wireless communication system.
Background technology
Please refer to Fig. 1, it illustrates and is the wireless communication system schematic diagram.Wireless communication system 100 for example is gsm system, cdma system or radio zone net (wireless LAN) etc., comprises the coverage area (cell) 102 of first base station 101 and the coverage area (cell) 112 of second base station 111.Wireless communication system 100 is wirelessly surfed the Net or is communicated by letter in order to a mobile device 120 to be provided.Mobile device 120 for example is mobile computer, personal digital assistant (personal digital assistant, PDA) portable apparatus such as grade that mobile phone maybe can be got online without being tethered to a cable.
Suppose that when initial, mobile device 120 is to be positioned at position A, communicates via first base station 101, first base station 101 is to send first signal, and second base station 111 is to send secondary signal.And position D be for first signal of first base station 101 farthest can and the position, crossed position D, mobile device 120 just again can not receive first signal of first base station 101.In other words, mobile device 120 is to be the lowest power value in the signal power of first signal of received first base station 101 of position D.Therefore must before mobile device 120 in-position D, mobile device 120 be switched to second base station 111 from first base station 101, to avoid the leakage of data.
Traditional changing method for example is, when mobile device 120 in moving process, the signal power that detects its first signal that receives first base station 101 is little compared with the signal power of secondary signal that it receives second base station 111, for example be at position P point, then begin to switch, make mobile device 120 change into and communicate via base station 112.
Yet, if only receive the opportunity that the fixing size of signal of base station power decides switching, can cause unnecessary switching, and the burden of wireless communication system is increased with mobile device 120.For instance, mobile device 120 might stay at position P, and the signal power of first signal of first base station of its reception still is enough to keep excellent communications, if only greatly promptly switch slightly because of the signal power of the secondary signal of second base station of its reception, will cause the increase of switching times, make that the load of wireless communication system is bigger.Just determine to switch greater than a fixed value if receive the signal power of the secondary signal of second base station with mobile device 120 in addition, if the excessive velocities of mobile device 120, coverage area exceeded first base station 101 in the moment of switching then might cause problems such as data interruption.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of efficient changing method exactly.
According to purpose of the present invention, a kind of changing method that is used for wireless communication system is proposed, in order to mobile device is switched to second base station from first base station, this first base station, one first signal, this second base station, one second power.At first, measure first signal first signal power and with the secondary signal power of secondary signal.Then, relatively first signal power and secondary signal power when first signal power is identical with secondary signal power, then produce equalized signals power according to this.Then, estimation power switched value, this power switched value is between the lowest power value of the equalized signals power and first signal power.When mobile device records itself and the first signal of base station power and is the power switched value, be about to mobile device and switch to second base station.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 illustrates and is the wireless communication system schematic diagram.
Fig. 2 illustrates a kind of changing method flow chart according to a preferred embodiment of the present invention.
Fig. 3 is the gsm system schematic diagram.
Fig. 4 is radio zone net system schematic.
The reference numeral explanation
101,301,401: the first base stations
102,112: coverage area
111,311,411: the second base stations
120: mobile device
310: control centre
320: mobile phone
430: router
420: PDA(Personal Digital Assistant)
Embodiment
Please refer to Fig. 2, a kind of changing method flow chart that it illustrates according to a preferred embodiment of the present invention is used for wireless communication system.Please be simultaneously with reference to Fig. 1.Mobile device 120 is to be positioned at position A when initial, communicates via first base station 101, and first base station 101 is to send first signal, and second base station 111 is to send secondary signal.And position D be for the signal of first base station 101 farthest can and the position, crossed position D, mobile device 120 just again can not receive first signal of first base station 101.In other words, mobile device 120 is to be lowest power value Pm in the signal power of first signal of received first base station 101 of position D.Therefore switch and before the D of mobile device in-position, to carry out.
At first, store a lowest power value Pm in mobile device 120, shown in step 210.Then, in moving process, mobile device 120 can continue to detect it and receive the signal power P1 of first signal of first base station 101, and detects the signal power P2 that it receives the secondary signal of second base station 111, shown in step 212 and 214.When mobile device 120 found that signal power P1 equals signal power P2, for example at position B, the signal power that mobile device 120 is about to this moment stored, and is recorded as equalized signals power P e, shown in step 216.Mobile device 120 is promptly according to equalized signals power P e and lowest power value Pm estimation switching signal power P h, shown in step 218.Switching signal power P h is between equalized signals power P e and lowest power value Pm, and tries to achieve with a preset ratio.For example can be preset as Ph=(Pe-Pm)/n+Pm, wherein n is a positive number, and n for example is 8.
Then, in moving process, when mobile device 120 detects its signal power that receives first signal of first base station 101 and is switching signal power P h,, promptly begin mobile device 120 is switched to second base station 111, shown in step 220 for example at position C point.
Switching signal power P h more can determine according to the rate travel of mobile device 120.If rate travel is fast, then the value of switching signal power P h can be increased, make distance D point switch when far away, just switch hurry up; If rate travel is slow, then the value of switching signal power P h can be reduced, make and more just switch near the D point, just switch slowly.
When the moving direction of mobile device 120 is during away from first base station 101, as moving to the D point by the A point, the rate travel of mobile device 120 and the rate of decay of signal power are to be positive correlation, therefore can use the reference pointer of power rate of decay Vp as the rate travel of mobile device 120.Power attenuation speed Vp can try to achieve before step 216 produces equalized signals power P e and get final product.For example can write down the signal power Pa that it receives first signal during at position A point when mobile device 120, cross time t, mobile device 120 moves to the B point, and the signal power that receive first signal this moment is Pe, then its power attenuation speed Vp=(Pa-Pe)/t.
If power attenuation speed Vp is bigger, then the value of switching signal power P h can be increased, make and switch hurry up; If power attenuation speed Vp is less, then the value of switching signal power P h can be reduced, make and more just switch near the D point.
Present embodiment also need be avoided the leakage of data in the handoff procedure in addition except the time point that above-mentioned definition is switched.Because switching to handover success from decision is to need a period of time, for example be T1, therefore in step 220, after decision is switched, the data that first base station 101 can will be given mobile device 120 earlier transfer to second base station 112 simultaneously, mobile device 120 just can be switched to second base station 112 then, can not miss to guarantee data.
The value that can more clearly define switching signal power P h according to power attenuation speed Vp is:
Ph＝Vp*T1+Pm .....................................................(1)
As long as before time T 1, begin to switch the leakage that promptly can avoid data, therefore the signal power before the time T 1 can be estimated according to power attenuation speed Vp, and just for this reason behind the power switched Ph, promptly can begin to switch in signal power that mobile device 120 detects itself and first base station 101.
By equation (1) as can be known, heal greatly as power attenuation speed Vp, the value of switching signal power P h promptly heals big, and expression mobile device 120 can more early switch in moving process; Vp is littler when power attenuation speed, and the value of switching signal power P h is promptly little, and expression mobile device 120 can slow the switching in moving process.
Because traditional switching mode is promptly to switch at setover B point, as the point of the P among Fig. 1.And therefore this method can reduce unnecessary switching times up to just beginning to switch near the D point very much, saves the load of wireless communication system.And switching time point can adjust according to the rate travel of mobile device 120.
The changing method of present embodiment is that can be applied to for example be the wireless communication system of gsm system and radio zone net system.Illustrate that at first the present embodiment changing method is applied to the situation of gsm system.Fig. 3 is the gsm system schematic diagram.Gsm system 310 comprises first base station 301, second base station 311 and control centre 310.Mobile phone 320 is in position A ' some when initial, communicates by letter via first base station 301.First base station 301 is that the signal that is sent with mobile phone 320 is sent to control centre 310; Control centre 310 also sends signal to mobile phone 320 via first base station 301.The lowest power value of the signal power of first signal of first base station 301 that mobile phone 320 is received is required to be Pm '.
In moving process, mobile phone 320 can continue to detect it and receive the signal power P1 ' of first signal of first base station 301, and detects the signal power P2 ' of the secondary signal of itself and second base station 311.When mobile phone 320 found that signal power P1 ' equals signal power P2 ', for example at position B ', the signal power that mobile phone 320 is about to this moment stored, and is recorded as equalized signals power P e '.Mobile phone 320 or control centre 310 are promptly according to equalized signals power P e and lowest power value Pm estimation switching signal power P h.Then, in moving process, the signal power that detects itself and first base station 301 when mobile phone 320 is switching signal power P h, for example at position C ' point, control centre 310 promptly begins follow-up data is transferred to second base station 311 simultaneously, and mobile phone 320 is switched to second base station 311.
Illustrate that again the present embodiment changing method is applied in the situation of radio zone net (wireless LAN) system.Fig. 4 is radio zone net system schematic.Radio zone net system 400 comprises first base station 401, second base station 411 and router four 30.First base station 401 and second base station 402 are that (access point, AP), (personal digitalassistant, PDA) 420 is example to mobile device with personal digital assistant at this for wireless access point.PDA 420 is in position A ' some when initial, surfs the Net via first base station 401, router four 30.First base station 401 and second base station 402 are to be linked to router four 30 jointly.The lowest power value of the signal power of first signal of first base station 401 that PDA 420 is received is required to be Pm ".
In moving process, PDA 420 can continue to detect it and receive the signal power P1 of first signal of first base station 401 ", and detect the secondary signal signal power P2 that it receives second base station 411 ".When PDA420 finds signal power P1 " equal signal power P2 " time, for example at position B ", the signal power that PDA 420 is about to this moment stores, and is recorded as equalized signals power P e ".PDA 420 or control centre 310 are promptly according to equalized signals power P e " and lowest power value Pm " switching signal power P h tried to achieve.Then, in moving process, be switching signal power P h when PDA 420 detects its signal power that receives first signal of first base station 401 ", for example at position C " point, be about to PDA 420 and switch to second base station 411.
Before formally PDA 420 being switched to second base station 411, the package that will give PDA 420 originally need be duplicated simultaneously a second base station 411 of giving.A kind of practice is initiatively package to be passed to second base station 411 by first base station 401.The another kind of practice is will send to first base station 401 and second base station 411 will on the network package of PDA 420 simultaneously by router four 30.
The disclosed changing method of the above embodiment of the present invention can reduce unnecessary switching times, and switches time point and can adjust according to the rate travel of mobile device, therefore can save the load of wireless communication system effectively.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (13)
1. changing method that is used for a wireless communication system, this wireless communication system comprises one first base station and one second base station, this method is in order to switch to this second base station with a mobile device from this first base station, this first base station, one first signal, this second base station, one secondary signal, this method comprises:
Store a lowest power value;
Measure one first power of this first signal and one second power of this secondary signal;
Relatively this first power and this second power when equating with this second power as if this first power, produce an equalized signals power according to this;
Performance number is switched in estimation one, and it is between this equalized signals power and this lowest power value; And
The power that records this first signal switches to this second base station with this mobile device during for this power switched value.
2. changing method as claimed in claim 1, wherein, the step that produces this power switched value more comprises:
Store a power attenuation rate value; And
Determine this power switched value according to this power attenuation rate value, this equalized signals power and this lowest power value.
3. changing method as claimed in claim 2, wherein, the production method of this power attenuation rate value comprises:
In a very first time, measure one the 3rd power of this first signal;
In one second time, measure one the 4th power of this first signal;
According to the difference of the 4th power and the 3rd power and the difference of this very first time and this second time and produce this power attenuation rate value.
4. changing method as claimed in claim 1, wherein, the step that this mobile device is switched to this second base station comprises:
Make this first base station that at least one follow-up data of itself and this mobile device is transferred to this second base station simultaneously; And
Switch this mobile device to this second base station.
5. changing method as claimed in claim 4, wherein, this wireless communication system is a gsm system.
6. changing method as claimed in claim 4, wherein, this wireless communication system is the radio zone net, and this first base station and this second base station are to be respectively wireless access point.
7. changing method as claimed in claim 1, wherein, this wireless communication system is the radio zone net, this first base station and this second base station are to be respectively wireless access point, and this first base station and this second base station are to be connected to a network by a router.
8. changing method as claimed in claim 7, wherein, the step that this mobile device is switched to this second base station comprises:
Make this router that at least one follow-up data of itself and this mobile device is transferred to this first base station and this second base station simultaneously; And
Switch this mobile device to this second base station.
9. a wireless communication system is used for a mobile device to communicate, and this system comprises:
One first base station, when initial, this mobile device system communicates this first base station, one first signal by this first base station; And
One second base station, this second base station, one secondary signal;
Wherein, this mobile device is to detect it simultaneously to receive one first power of this first signal and one second power of this secondary signal, this mobile device is this first power and this second power relatively, when if this first power is identical with this second power, then produce an equalized signals power according to this, this mobile device produces one according to this equalized signals power and switches performance number, and it is between this an equalized signals power and a lowest power value;
Wherein, the power of this first signal that records its reception when this mobile device is when this power switched value, and this wireless communication system is about to this mobile device and switches to this second base station.
10. wireless communication system as claimed in claim 9, wherein, this mobile device more determines this power switched value according to a power attenuation rate value.
11. wireless communication system as claimed in claim 9, wherein, before this system switched to this second base station with this mobile device, this first base station transferred to this second base station simultaneously with at least one follow-up data of itself and this mobile device.
12. wireless communication system as claimed in claim 9, wherein, this wireless communication system is a gsm system.
13. wireless communication system as claimed in claim 9, wherein, this wireless communication system is the radio zone net, and this first base station and this second base station are to be respectively wireless access point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100785408A CN100448302C (en) | 2004-09-09 | 2004-09-09 | Delivering method for wireless communication system |
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| CNB2004100785408A CN100448302C (en) | 2004-09-09 | 2004-09-09 | Delivering method for wireless communication system |
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| CN100448302C true CN100448302C (en) | 2008-12-31 |
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| CNB2004100785408A Expired - Fee Related CN100448302C (en) | 2004-09-09 | 2004-09-09 | Delivering method for wireless communication system |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030235163A1 (en) * | 2002-06-24 | 2003-12-25 | Compaq Information Technologies Group, L.P. | Wireless packet routing for minimal delay and simplification of packet routing |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030235163A1 (en) * | 2002-06-24 | 2003-12-25 | Compaq Information Technologies Group, L.P. | Wireless packet routing for minimal delay and simplification of packet routing |
Non-Patent Citations (2)
| Title |
|---|
| 蜂窝移动通信系统中的切换. 张永生，李道本.《移动通信》，第4期. 1998 |
| 蜂窝移动通信系统中的切换. 张永生，李道本.《移动通信》，第4期. 1998 * |
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