CN101873673A - Double radio frequency scheduling method for quick switching - Google Patents
Double radio frequency scheduling method for quick switching Download PDFInfo
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- CN101873673A CN101873673A CN200910139279A CN200910139279A CN101873673A CN 101873673 A CN101873673 A CN 101873673A CN 200910139279 A CN200910139279 A CN 200910139279A CN 200910139279 A CN200910139279 A CN 200910139279A CN 101873673 A CN101873673 A CN 101873673A
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Abstract
The invention relates to the technical field of wireless communication and discloses a double radio frequency scheduling method for quick switching. The method comprises: calculating and collecting measurement data of a plurality intelligent triggers according to metric values of different layers of wireless network access link of a mobile terminal, and acquiring a scanning decision limit by using a multi-condition decision unification algorithm; and when the intelligent triggers are normal, allowing the mobile terminal to execute intelligent trigger decision scanning according to the scanning decision limit, or when the intelligent triggers are abnormal, allowing the mobile terminal to execute periodical scanning. When the double radio frequency scheduling method for quick switching, disclosed by the invention, is used, the alternate activating and deactivating double radio frequency scheduling interfaces are used to execute active scanning. When the method is used in the mobile terminal, unnecessary energy consumption is avoided and the performance of the quick switching is not lowered.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly, relate to a kind of dispatching method that in wireless network, is used for the dijection frequency interface of switching fast.
Background technology
Along with development of wireless communication devices, application based on wireless network increases fast, emerged in large numbers a large amount of different types of portable terminals, as portable notebook computer, smart mobile phone and PDA(Personal Digital Assistant) etc., because the mobility of portable terminal, often point of network attachment such as the base station of change access or wireless network access point are to strengthen the application performance of wireless network.
At present, adopted the so up-and-coming solution of dijection frequency interface scheme to be supported in quick hand-off process in isomorphism wireless network or the heterogeneous wireless network in academic and industrial application.The dijection frequently direct purpose of scheme is that by connect portable terminal and network two are connected link and are implemented in to switch can connect afterwards earlier when taking place and disconnect, and the assurance data are not lost.Yet this continuous a plurality of connection links will cause clear and definite energy consumption, and this also is the serious problem of paying close attention in the portable terminal product of reality.This problem has also caused portable terminal manufacturer and designer's concern, but since at present the battery of mobile terminal performance can't be satisfactory and the progress of the high efficiency power supply plan of portable terminal slow.Therefore, present dijection frequently scheme need aspect energy-conservation further perfect.
Summary of the invention
The technical problem to be solved in the present invention is, the problem that causes reducing the portable terminal energy consumption at not considering energy-conservation and QOS factor in just will switching fast to take in as the limit priority factor in the prior art provides a kind of energy-conservation double radio frequency scheduling method of switching fast that is used in wireless network.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of energy-conservation double radio frequency scheduling method of switching fast that is used for, described method comprises:
The measurement data that the wireless network links different layers metric that inserts according to portable terminal calculates and collects a plurality of intelligent contactors obtains the scanning signals according to many condition judgement normalizing algorithms simultaneously;
When intelligent contactor was normal condition, portable terminal was carried out intelligent contactor judgement scanning according to described scanning signals, otherwise, the scanning of execution cycle property.
In method of the present invention, described wireless network comprises isomorphism wireless network or heterogeneous wireless network.
In method of the present invention, described intelligent contactor is the index that indication is switched.
In method of the present invention, the linear system formula of described many condition judgement normalizing algorithms is:
Wherein, ScanTriggerDecision is the scanning signals, w
iBe weighted value, f
iIt is the intelligent contactor value.
In method of the present invention, the non linear system formula of described many condition judgement normalizing algorithms is:
Wherein, ScanTriggerDecision is the scanning signals, w
iBe weighted value, f
iIt is the intelligent contactor value.
In method of the present invention, described a plurality of intelligent contactors are to adopt at least two intelligent contactors.
In method of the present invention, described portable terminal comprises two radio frequency interfaces, the conventional operation such as be used to communicate by letter of radio frequency interface, and another radio frequency interface is used for active scan and connects, and after switching, two radio frequency interfaces exchange operation.
In method of the present invention, the scan period of described periodic scan is adjusted in accordance with the following methods:
When switching frequency is indicated greater than the switching frequency threshold value, shorten the scan period of described periodic scan, the step-length of shortening is α, otherwise, prolonging the scan period of described periodic scan, the step-length of prolongation is β.
In method of the present invention, described step-length α and β can still be not limited to 20 milliseconds to 1 second based on the scope in 802.11 the system.
In method of the present invention, the indication of described switching frequency is the switching times decision that takes place in according to the unit interval under the situation that sampling window is determined, the formula of calculating is:
Wherein, HandoffFreqIndicator is the switching frequency indication, and f is a regulatory factor, n
HandoffBe to switch frequency, t
SampleIt is the time window of sampling.
The invention has the beneficial effects as follows: by a kind of double radio frequency scheduling method of switching fast that is used for provided by the invention, adopt activation in turn and deexcitation dijection frequency interface to carry out active scan, by adopting intelligent contactor to make that scanning is more accurate, unnecessary scanning and attended operation have been reduced by adaptive scheduling simultaneously, thereby under the situation that does not reduce performance of handoffs, reduced the energy consumption of portable terminal, also will the prolonging greatly of portable terminal in the net time.
Description of drawings
Fig. 1 is a kind of flow chart of the double radio frequency scheduling method of switching fast that is used for according to a preferred embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 is a kind of flow chart of the double radio frequency scheduling method of switching fast that is used for according to a preferred embodiment of the present invention.As shown in Figure 1, described method flow 100 starts from step 102, fast development along with wireless communication technology, a large amount of portable terminals with dijection frequency interface has appearred in the application of isomorphism wireless network and heterogeneous wireless network, as mobile phone, PDA(Personal Digital Assistant) and notebook computer etc.For efficient and the performance that improves communication, described portable terminal has two radio frequency interfaces that connect wireless network, can switch fast in different communication links or different network.
In step 104, described portable terminal is according to the metric calculating of different wireless communication links and the measurement data of collecting a plurality of intelligent contactors.In a preferred embodiment of the invention, intelligent contactor f
1, f
2... f
iComprise signal-to-jamming ratio (Signal-to-Interference), transmission rate slope (Transmission Rate Slope) and packet loss (Packet Lost Ratio) or the like, described intelligent contactor is the index that indication is switched, at least adopt two described intelligent contactors in a preferred embodiment of the invention, specific to different intelligent contactors, for example
Be the intelligent contactor of link layer transmission rate driver sweep, characterize the transmission rate rate of change in the certain hour window, wherein w
iBe weight, r
iIt is transmission rate.
In step 106, by the normalizing fusion acquisition scanning signals of a plurality of intelligent contactors.It is to adopt many condition judgement normalizing algorithms that described normalizing merges, and for linear system, the formula of described many condition judgement normalizing algorithms is:
Wherein, ScanTriggerDecision is the scanning signals, w
iBe weighted value, f
iIt is the intelligent contactor value.Promptly by giving the influence that the intelligent contactor weight is regulated the different layers intelligent contactor; In to the responsive more non linear system of intelligent contactor, the formula of described many condition judgement normalizing algorithms is:
Wherein, ScanTriggerDecision is the scanning signals, w
iBe weighted value, f
iIt is the intelligent contactor value.According to the needs of concrete application, different intelligent contactors can be set in physical layer, network layer or application layer.
In step 108, judge whether to adopt trigger judgement scanning, if the state of intelligent contactor normally promptly can just adopt trigger judgement scanning during operate as normal, continue execution in step 110; Otherwise, if the mobility of unforeseen portable terminal cause intelligent contactor that Radio Link measures can't operate as normal the time with regard to the scanning of execution cycle property ground, promptly execution in step 112.
In step 110, because what adopt is trigger judgement scanning, then the scanning signals that obtains according to many condition judgement normalizing algorithm computation sends to corresponding scan schedule control signal the network interface unit of the dijection frequency interface of described portable terminal, adopt activation in turn and deexcitation dijection frequency interface to carry out active scan, end at step 122 then.
In step 112, adopt periodic scan, the scan period is regulated by adaptive algorithm, in principle, this means that scanning times just increases when connecting when switching frequency indication is about to connect, or opposite, scanning times just reduces when connecting when the switching frequency indication is about to disconnect.
In step 114, whether judge switching frequency indication (HandoffFreqIndicator) greater than switching frequency threshold value (FrqThreshold), if switching frequency is indicated greater than the switching frequency threshold value execution in step 116, otherwise execution in step 118.
In step 116, switching frequency is indicated greater than switching frequency threshold value, i.e. HandoffFreqIndicator＞FrqThreshold
Then ScanIntervali=ScanIntervali-α wherein, ScanIntervali is sweep spacing, α is a step-length, promptly shortens the scan period of described periodic scan, the step-length of shortening is α.
In step 118, the switching frequency indication is not more than switching frequency threshold value, i.e. HandoffFreqIndicator≤FrqThreshold
Then ScanIntervali=Min ((ScanIntervali+ β), ScanIntervalThreshold) wherein, ScanIntervali is sweep spacing, β is a step-length, promptly prolongs the scan period of described periodic scan, the step-length of prolongation is β.α and β be according to mobility, the distribution density of AP (base station or accessing points), the decision of actual scenes such as application kind of moving on kind of portable terminal (as smart mobile phone or notebook computer) and the terminal and quantity.Empirical value scope α and β for the common stepping of continual mobile scene can be that 20ms is to 50ms; For or the nomadism scene that moves, α and β can be loosened to 1s, for example in based on 802.11 system, desirable 20 milliseconds to 1 second.FrqThreshold, ScanIntervalThreshold also are subjected to the portable terminal translational speed, and the distribution density of AP (base station or accessing points) and the influence of self adaptation operating frequency are the per second several usually under the scene.
In step 120, adjusted the scan period of periodic scan according to the adaptive algorithm of step 116 or step 118, the dijection that the scan schedule control signal is sent to described portable terminal is the network interface unit of interface frequently, adopt activate in turn and the deexcitation dijection frequently interface with the execution active scan.
The method flow 100 of the preferred embodiments of the present invention ends at step 122.Owing to dijection frequency dispatching method of the present invention adopts activation in turn and deexcitation dijection frequency interface with the execution active scan, scanning decision simultaneously relates to two factors, promptly as the measurement of the Radio Link tolerance of intelligent contactor with as the former historical knowledge that switches of scheduler.The algorithm of intelligent contactor and scheduler is used to handle and is switching complexity when taking place so that correspondingly control radio frequency interface, the introducing of these intelligent contactors only with single, is compared the scanning decision error that can reduce effectively in mixed and disorderly wireless communications environment with existing as RSSI (indication of received signal intensity) trigger.Because method of the present invention has reduced unnecessary scanning by adaptive scheduling and attended operation makes that by the employing intelligent contactor scanning is more accurate simultaneously, therefore, has reduced the energy consumption of portable terminal under the situation that does not reduce performance of handoffs.
Method of the present invention is applied on the portable terminal with two radio frequency interfaces, a radio frequency interface is as the operation as routines such as communications, another radio frequency interface is used as active scan and is connected, purpose is to reach quick switching (promptly connecting the back disconnects), after switching, two radio frequency interfaces exchange operation.The isomery interface that this dijection frequency interface comprises the isomorphism interface of two same wireless networks or belongs to different networks.By developing quick switching, any application for disconnection between the network or exchange sensitivity all will be benefited, and for example streaming media video is used and VOIP uses.Adopt method of the present invention, the energy consumption of the above-mentioned portable terminal of mentioning will reduce will prolonging greatly in the net time of portable terminal simultaneously, and this also is one of factor of paying close attention to most of portable terminal manufacturer.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. one kind is used for the double radio frequency scheduling method of switching fast, it is characterized in that described method comprises:
According to the metric calculating of portable terminal access of radio network link different layers and the measurement data of collecting a plurality of intelligent contactors, obtain the scanning signals according to many conditions judgement normalizing algorithms simultaneously;
When intelligent contactor was normal condition, portable terminal was carried out intelligent contactor judgement scanning according to described scanning signals, otherwise, the scanning of execution cycle property.
2. the double radio frequency scheduling method of switching fast that is used for according to claim 1, it is characterized in that: described wireless network comprises isomorphism wireless network or heterogeneous wireless network.
3. the double radio frequency scheduling method of switching fast that is used for according to claim 1, it is characterized in that: described intelligent contactor is the index that indication is switched.
4. the double radio frequency scheduling method of switching fast that is used for according to claim 1 is characterized in that: the linear system formula of described many conditions judgement normalizing algorithms is:
The non linear system formula is:
Wherein, ScanTriggerDecision is the scanning signals, w
iBe weighted value, f
iIt is the intelligent contactor value.
5. the double radio frequency scheduling method of switching fast that is used for according to claim 1, it is characterized in that: described a plurality of intelligent contactors adopt at least two intelligent contactors.
6. the double radio frequency scheduling method of switching fast that is used for according to claim 1, it is characterized in that: described portable terminal comprises two radio frequency interfaces, conventional operations such as radio frequency interface is used to communicate by letter, another radio frequency interface is used for active scan and connects, after switching, two radio frequency interfaces exchange operation.
7. the double radio frequency scheduling method of switching fast that is used for according to claim 1, it is characterized in that: the scan period of described periodic scan is adjusted in accordance with the following methods:
When switching frequency is indicated greater than the switching frequency threshold value, shorten the scan period of described periodic scan, the step-length of shortening is α, otherwise, prolonging the scan period of described periodic scan, the step-length of prolongation is β.
8. the double radio frequency scheduling method that switches fast of being used for according to claim 7 is characterized in that: described switching frequency indication is the switching times decision that takes place in according to the unit interval under the situation that sampling window is determined, the formula of calculating is:
Wherein, HandoffFreqIndicator is the switching frequency indication, and f is a regulatory factor, n
HandoffBe to switch frequency, t
SampleIt is the time window of sampling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792556A (en) * | 2016-12-08 | 2017-05-31 | 武汉虹信通信技术有限责任公司 | Serving cell switching handling method under a kind of track traffic scene |
| CN106993305A (en) * | 2017-05-27 | 2017-07-28 | 奇酷互联网络科技（深圳）有限公司 | Communication abnormality processing method, device and mobile terminal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6385460B1 (en) * | 1998-05-26 | 2002-05-07 | Conexant Systems, Inc. | Power management system for a mobile unit by reduced neighbor cell scanning |
| DE602005015326D1 (en) * | 2005-07-27 | 2009-08-20 | Alcatel Lucent | Method for triggering a handover |
| CN101409900B (en) * | 2008-11-25 | 2010-06-02 | 北京交通大学 | Self-adapting triggering method for establishing new link for WLAN seamless switch |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792556A (en) * | 2016-12-08 | 2017-05-31 | 武汉虹信通信技术有限责任公司 | Serving cell switching handling method under a kind of track traffic scene |
| CN106993305A (en) * | 2017-05-27 | 2017-07-28 | 奇酷互联网络科技（深圳）有限公司 | Communication abnormality processing method, device and mobile terminal |
| CN106993305B (en) * | 2017-05-27 | 2020-06-26 | 奇酷互联网络科技（深圳）有限公司 | Communication exception handling method and device and mobile terminal |
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