CN1710986A - Wireless local-network discovering method based on honeycomb network positioning - Google Patents

Wireless local-network discovering method based on honeycomb network positioning Download PDF

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CN1710986A
CN1710986A CNA2005100121295A CN200510012129A CN1710986A CN 1710986 A CN1710986 A CN 1710986A CN A2005100121295 A CNA2005100121295 A CN A2005100121295A CN 200510012129 A CN200510012129 A CN 200510012129A CN 1710986 A CN1710986 A CN 1710986A
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wlan
subscriber equipment
network
location
wireless local
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CN100372440C (en
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江俊锋
曹志刚
樊平毅
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Tsinghua University
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Tsinghua University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract

The invention belongs to intercommunication area between wireless local area network (WLAN) and cellular network. Characters are that in WCDMA network, after setting up location survey, service mobile positioning, and storing information of geographical position of WLAN and cellular network as well as information of operational parameter of WLAN in gateway MLC, the disclosed method determines whether user's device is entered into area covered by WLAN already through collaborative work between user's device and cellular network; if yes, through built in WLAN wireless interface, user's device executes operation to activate WLAN scanning function to carry out WLAN scanning and execute operation to find out WLAN. The invention can save addressing energy for user's device and prolongs operational time of user's device.

Description

WLAN (wireless local area network) discover method based on the cellular network location
Technical field
The present invention relates to the method for wireless lan (wlan) and cellular network intercommunication, in the process of particularly a kind of WLAN and the intercommunication of 3G (Third Generation) Moblie cellular network, subscriber equipment (UE) utilizes the location technology of cellular network to carry out the mechanism that WLAN finds.
Background technology
Along with the rise and the development of wireless lan (wlan) technology, it uses order benefit extensively, thus WLAN and wireless mobile communication network (comprise GSM, CDMA, WCDMA, TD-SCDMA, fusion CDMA2000) has become the focus of current academia and industrial quarters concern.For example, third generation partner program (3GPP) standardization body has proposed the standard of a series of WLAN and 3GPP network interworking.(specifically 22.934 and 22.234 standards that propose in August, 2002 referring to 3GPP standardization body).
Fig. 1 is the scene figure that WLAN and 3G (Third Generation) Moblie net merge.WLAN be laid on hot zones (as the airport, harbour, the market, office block, or the like), data, services at a high speed is provided, the 3G (Third Generation) Moblie net is laid on a large scale, and the service of voice, low speed data is provided.As shown in Figure 1, subscriber equipment (UE) both can have been accepted the data access service of WLAN, also can accept the access service of 3G (Third Generation) Moblie network, it can be between WLAN and 3G (Third Generation) Moblie network seamless roam.
The basic demand that seamless roam is realized is the service that subscriber equipment is just being accepted the 3G (Third Generation) Moblie network, in case it has entered after the coverage of WLAN, can switch to WLAN, accepts the service of WLAN.This switching in is called vertical switching in the academic research; And vertically switching to WLAN from the mobile cellular communication network, prerequisite is the discovery of WLAN.
Why to carry out the discovery of WLAN, mainly be based on following two reasons.(1) coverage of WLAN is little, and its coverage often has only hundreds of rice, and it is laid on some hot zones.(2) subscriber equipment needs to activate the WLAN scan function when carrying out the discovery of WLAN, and this function needs the consumes battery energy.When subscriber equipment is in outside the coverage of WLAN, if continue to carry out WLAN scanning, can waste the energy content of battery, the operating time of subscriber equipment is shortened.
Therefore, subscriber equipment should just carry out the scanning of WLAN where at WLAN.Up to the present, relate to Study on Mechanism that WLAN finds seldom, at list of references (M.Ylianttila, J.Makela, K.Pahlavah, " Analysisof handoff in a location-aware vertical multi-access network; " Computer Networks, vol.47,205, pp185-201) in, the author has mentioned the method that the auxiliary WLAN of employing global positioning system (GPS) finds.The method that adopts the auxiliary WLAN of GPS to find has the higher characteristics of accuracy, but owing to adopt GPS to require subscriber equipment that the GPS module is installed, this can cause the increase of equipment cost, and because the condition of work of GPS hi-Fix is to have the direct projection path, for the intensive area of city high rise building, this condition can not be guaranteed, so the validity of GPS is limited.Therefore, the method based on GPS can not demonstrate fully its superiority.
The document of third generation partner program (3GPP) (referring in March, 2004 document 22.071 of 3GPP) is pointed out, can adopt the location-based service (LCS of cellular network, Location Service) carry out the discovery of hot zones, in the document, hot zones only refers to the place that number is intensive.And the document also only provides one and extremely simply describes, and does not find to propose concrete mechanism at the area of focus.
In 3-G (Generation Three mobile communication system), main localization method has the method based on cellular cell identification code (ID), based on the method for observation arrival time difference (OTDOA, Observed Time Difference of Arrival), the method that GPS is auxiliary.Because the auxiliary method of GPS has the equipment cost height, be difficult to adapt to shortcoming such as urban district complex environment, 3GPP as optional function, is not that each subscriber equipment is all supported with this.And the method for cellular cell ID and OTDOA method are listed in essential function.
Cellular cell ID can provide the location of cell range precision, and it is at certain cellular cell that subscriber equipment can be determined; Therefore the positioning accuracy of this method is relevant with the radius of society of honeycomb, and positioning performance is relatively poor relatively.
With different based on the method for cellular cell ID, this method can further position subscriber equipment in cell range based on the method for OTDOA; This method is consumer positioning more accurately.Aspect positioning accuracy, this mechanism can be in tens of meters scope locating user devices.This positioning accuracy can satisfy the requirement that WLAN (wireless local area network) is found substantially.
But up to now, the someone does not propose the mechanism that the concrete location technology of utilizing cellular network is carried out the WLAN discovery; And the location technology of utilizing cellular network is carried out the discovery of WLAN, can solve the problem that subscriber equipment continues to carry out WLAN scanning, thereby saves the energy content of battery of subscriber equipment, prolongs the operating time of subscriber equipment.
Summary of the invention
The objective of the invention is to propose the discovery mechanism of a kind of WLAN of the location technology based on cellular network, to solve pinpointing the problems of WLAN in WLAN and the wireless communication system fusion.
In order to achieve the above object, in mechanism of the present invention, subscriber equipment need be found preparatory stage, positioning stage and sweep phase through WLAN.
In the planning and the laying stage of network, WLAN lays in specific place in operator.At this moment, the covering geographic area of WLAN, running parameter information such as operating frequency and access authority all can obtain, and these information stores are in the somewhere of network, and these information will be used for the discovery of WLAN.
Phase I: WLAN finds the preparatory stage
Find the preparatory stage at WLAN, the work of mainly finishing has two parts, and the one, definite subscriber equipment end is supported the function of WLAN, promptly subscriber equipment is a multimode terminal, both can be operated in the cellular network, also can be operated among the WLAN; The 2nd, determine that the place cellular cell belongs to the overlay area of certain WLAN.When two conditions satisfied, cellular network was necessary just to inform that there is WLAN in subscriber equipment, thereby the guiding subscriber equipment carries out the discovery of WLAN.
If in this sub-district WLAN is arranged, and the interface of subscriber equipment support WLAN (wireless local area network) itself, subscriber equipment will send Location Request to cellular network so.This cellular network receives after the request of subscriber equipment, will begin subscriber equipment is positioned, and enters second stage.
Second stage: positioning stage
After cellular network sends Location Request, network will be responded at subscriber equipment, if user's information such as authority satisfy condition, network will be accepted user's request and subscriber equipment is positioned.
For subscriber equipment is positioned, cellular network will be set a time interval, and every a time interval, this network and subscriber equipment cooperative cooperating carry out the location of subscriber equipment.If the several times positioning result shows that subscriber equipment has entered the coverage of WLAN continuously, cellular network will be informed subscriber equipment, and it has entered the coverage of WLAN, and excited users equipment enters three phases, i.e. sweep phase.In order to improve the discovery speed of WLAN, cellular network also will provide the running parameter of required discovery WLAN for subscriber equipment, such as operating frequency, insert authority etc.
Phase III: sweep phase
In this stage, subscriber equipment will activate the scan function of WLAN, carry out the scanning of WLAN.Because after second stage in front finished, subscriber equipment can be determined the operating frequency of this WLAN from the message that cellular network provides, so website can only scan given frequency.
Subscriber equipment is according to certain intermittent scanning WLAN, the time remaining regular hour length of each scanning.If this scanning result shows the existence that does not have WLAN, subscriber equipment will scan after this scan period once more so; This scanning process will last till till the subscriber equipment discovery WLAN, perhaps reach the scanning times of maximum permission.
If subscriber equipment has been found WLAN (wireless local area network), its follow-up action will be continued; Follow-up action may be vertical switching or other action, and these move not within limit of consideration of the present invention.If subscriber equipment is after the scanning times that reaches maximum, do not find WLAN, subscriber equipment will be according to its broadcast that receives at cellular network, determine whether it has left the sub-district with WLAN, if website has left this sub-district, subscriber equipment will report that WLAN finds failure, and will be former because leave current area; Otherwise subscriber equipment is only reported and is found failure.
If cellular network receives the WLAN discovery failed message that subscriber equipment sends, the WLAN discovery mechanism will return first stage.
Based on the WLAN (wireless local area network) discover method of cellular network location, it is characterized in that: described method is the Wideband Code Division Multiple Access (WCDMA) that meets the 3G (Third Generation) Moblie standard following, promptly realizes in the network of WCDMA, and described WCDMA network contains:
(1) Node B;
(2) service wireless network controller is designated as SRNC, links to each other with Node B by Iub interface;
(3) radio network controller is designated as RNC, links to each other with Node B by Iub; Described RNC links to each other with described SRNC by the Iur interface simultaneously;
(4) third generation mobile switching centre/Visited Location Registor is designated as 3G MSC/VLR, links to each other with described SRNC by the Iu interface;
(5) third generation service gateway nodes is designated as 3G SGSN, links to each other with described SRNC by Iub interface;
(6) Gateway Mobile Location Center is designated as gateway MLC, links to each other with 3G MSC/VLR with described 3G SGSN respectively by Lg interface;
(7) attaching position register is designated as HLR, links to each other with described gateway MLC by the Lh interface;
(8) external server links to each other with described gateway MLC by the Lh interface;
Described method realizes according to the following steps:
(1) following functional module is set in described WCDMA network system:
1) location survey module, be arranged in Node B and the subscriber equipment, according to the measurement request of described SRNC to measuring from position information of user equipment, measurement result is passed to described SRNC, perhaps spontaneously periodically carry out signal measurement and measurement result is passed to described SRNC;
2) Serving Mobile Location Center module, i.e. SMLC module, this module is arranged among the described SRNC, so that when being used as a plurality of subscriber equipmenies location, the priority of scheduling location; Be used to calculate the position of subscriber equipment, and carry out different Coordinate Conversion, estimate locating accuracy; Also collaborative simultaneously and control subscriber equipment positions;
3) among the described gateway MLC or with described external server that gateway MLC links to each other in, store WLAN (wireless local area network), i.e. WLAN is with the geographical position coordinates information of cellular network;
(2) subscriber equipment judges whether the in-house facility type supports wireless lan interfaces: as if not possessing wireless lan interfaces, constipation bundle after receiving the message that shows this Node B and the coexistence of described WLAN (wireless local area network) that Node B is sent with No. 15 system information; Otherwise, just send a locating request message to described gateway MLC, comprising the identification code ID of this cellular cell and the access information of subscriber equipment by affiliated WCDMA network; Described No. 15 system information is a kind of of the message broadcasted in cell range of WCDMA network, and broadcast is numbered No. 15 under it;
(3) gateway MLC judges whether user right satisfies condition:
1) if user right does not satisfy condition, gateway MLC replys to the location that subscriber equipment sends the request failure, subscriber equipment constipation Shu Faxian operation;
2) if user right satisfies condition, gateway MLC agrees to carry out the discovery of WLAN (wireless local area network) just to subscriber equipment echo reply message;
(4) gateway MLC comprises the location interval T that is used for gateway MLC setting to one of described service network controller transmission PAt interior positioning command;
(5) after described service wireless network controller receives the positioning command that gateway MLC sends, the location interval T is set just P, and begin to the subscriber equipment location, simultaneously every a described location interval T according to the positioning flow of described WCDMA PTime to gateway MLC report positioning result;
(6) after gateway MLC receives positioning result in the step (5), come according to the position of the subscriber equipment of wherein describing that to carry out matching ratio right with the position of WLAN (wireless local area network), in case the match is successful, it is the coverage that subscriber equipment has entered WLAN (wireless local area network), gateway MLC just sends a scan command to subscriber equipment, wherein contains the running parameter of WLAN (wireless local area network); Affiliated matching times preestablishes, but is at least once;
(7) after subscriber equipment was received the scan command described in the step (6), just the wireless lan function module in the excited users equipment had been carried out wireless local area network scan by the maximum scan number of times that presets, and wherein, the time set of each scanning is T S, sweep spacing is made as T D, wherein, T SAnd T DBe default parameter;
(8) subscriber equipment, just scans successfully to gateway MLC report if found WLAN (wireless local area network) by the described scan operation of step (7); If after arriving the maximum scan number of times, do not find WLAN (wireless local area network), just report the scanning failure to gateway MLC, if subscriber equipment is found oneself to have left former cellular cell at this moment, just in the scanning failed message content of report, add failure cause;
(9) finish the operation that this finds WLAN (wireless local area network).
Matching times in the described step (6), promptly locate matching times and choose by following 6 kinds of situations:
2.1 work as P 1＜0.1, P 2During=[0.1,1], m=1;
2.2 work as P 1=(0.1,0.3), P 2During=[0.1,1], m=1,2, optional one;
2.3 work as P 1=[0.3,0.5], P 2During=[0.1,0.6], m=1;
2.4 work as P 1=(0.3,0.5), P 2During=[0.6,1], m=1,2,3, optional one;
2.5 work as P 1=[0.5,1], P 2During=[0.1,0.5], the positioning accuracy extreme difference, m=2 is selected in suggestion;
2.6 work as P 1=[0.1,0.5], P 2During=[0.6,1], m=1,2,3,4,5, optional one;
Wherein, m is the location number of times,
P 1For subscriber equipment outside the WLAN (wireless local area network) coverage, but be positioned in the probability within the WLAN (wireless local area network) coverage;
P 2For subscriber equipment within the WLAN (wireless local area network) coverage, and be positioned in probability within the WLAN (wireless local area network) coverage;
Described P 1, P 2Value in real system by measure obtaining.
The invention effect
Because the coverage of WLAN is little, its coverage often has only hundreds of rice, and it is laid on some hot zones.Subscriber equipment needs to activate the WLAN scan function when carrying out the discovery of WLAN, this function needs the consumes battery energy.When subscriber equipment is in outside the coverage of WLAN, if carry out WLAN scanning continually or constantly, can waste the energy content of battery, the operating time of subscriber equipment is shortened.
And adopt this invention, subscriber equipment only near the zone of WLAN, to carry out the discovery of WLAN, thereby can avoid frequently carrying out the situation generation that WLAN finds.Thereby can save the subscriber equipment energy content of battery, prolong the operating time of subscriber equipment.
In addition, this invention does not need to position on a large scale the change of equipment and software, but adopting existing cellular network location technology and equipment, only need carry out the enforcement that software upgrading can be finished algorithm.
Description of drawings
Fig. 1, the scene that WLAN and 3G (Third Generation) Moblie net merge, among the figure:
AP: WAP (wireless access point);
WLAN: WLAN (wireless local area network), down together.
Fig. 2 has the WCDMA network configuration of positioning function, among the figure:
SRNC: service wireless network controller;
RNC: radio network controller;
3G SGSN: third generation gateway service node;
3G MSC/VLR: third generation mobile switching centre/Visited Location Registor;
HLR: attaching position register;
Gateway MLC: Gateway Mobile Location Center;
Iub, Iur, Iu, Lg, Lh etc. are for the standard interface of 3GPP definition, referring to 3GPP document TR 21.905.
Fig. 3, Location Request with reply flow process, among the figure:
SGSN: third generation gateway service node, down together
Gateway MLC: Gateway Mobile Location Center, down together
Fig. 4, position fixing process and matching process, T among the figure P: positioning time is at interval
Fig. 5, the scanning flow process
Fig. 6, the flow process of WLAN discovery mechanism
Fig. 7, subscriber equipment is activated the probability that WLAN scans by mistake, among the figure:
P 1: subscriber equipment but is positioned in the probability within the WLAN coverage outside the WLAN coverage, down together.
M: continuously subscriber equipment is thought at the number of times of WLAN coverage in the location, down with.
Fig. 8, positioning result show that website shifts at the number of times of WLAN coverage, among the figure:
P 2: subscriber equipment and is positioned in probability within the WLAN coverage within the WLAN coverage
Location number of times that Fig. 9, subscriber equipment need wait for and locating accuracy P 2Relation.
Embodiment
This section is fused to example with the WCDMA mobile radio networks of WLAN and 3GPP, carries out the detailed process that WLAN finds by Fig. 2 to Fig. 5 declarative description.But should be understood that the present invention can also be generalized to the WLAN discovery procedure of WLAN and the fusion of other cellular mobile communication networks, as long as cellular network has the positioning functions of tens of rice with interior precision in such cellular mobile communication networks.
Fig. 2 is a network structure with WCDMA of positioning function, subscriber equipment links to each other with Node B by air interface among the figure, Node B links to each other with service wireless network controller (SRNC) by Iub interface, SRNC links to each other by Iu with third generation mobile switching centre/Visited Location Registor (3G MSC/VLR), SRNC adopts the Iur interface to be connected with radio network controller (RNC), SRNC also links to each other with third generation gateway service node (SGSN) by the Iu interface, and Gateway Mobile Location Center (gateway MLC) links to each other with 3G MSC/VLR with 3G-SGSN respectively by Lg interface.(annotate: Iub interface herein, Iu interface, Iur interface, Lg interface are the standard interface of 3GPP definition, see also in March, 2002 3GPP document TR 21.905)
Node B is integrated with Location Measurement Unit (LMU) module among Fig. 2, and the function of Node B is to carry out signal measurement, and the result that will measure passes to SRNC; This part function is finished by integrated LMU.LMU carries out signal measurement according to the measurement request of sending according to SRNC, also can spontaneously periodically carry out signal measurement and report measurement result to SRNC.
SRNC is integrated with Serving Mobile Location Center (SMLC) module, and the function of SRNC is to adjust distributing user equipment location resource needed, calculates last positioning result and estimates positioning accuracy.Signaling transmission between SMLC and the LMU is by Iub interface, sometimes also by the Iur interface.The major function of SRNC is:
1) priority of scheduling location.When a plurality of subscriber equipmenies need be located, arrange the sequencing of location.
2) location Calculation.SRNC is responsible for calculating the position of subscriber equipment, and carries out the conversion of different coordinates.In addition, SRNC will position the estimation of precision.
3) collaborative and control positions with corpse equipment.
In location process, subscriber equipment is measured descending link signal, perhaps according to the location survey requirement, and the signal that needs in some location of ul transmissions.
(perhaps with external server that gateway MLC links to each other in) stores the geographical position coordinates information of WLAN and cellular network among the gateway MLC, and these information will be for using in the flow process of narrating below.
In the laying stage of network, WLAN will lay in operator, and measure the coverage of WLAN, and the geographical location information that obtains will leave gateway MLC (the perhaps location server that links to each other with gateway MLC) in.
In having the sub-district of WLAN, in the system information of Node B broadcasting, indicate this sub-district and WLAN coexistence, promptly belong to the overlay area of certain WLAN in this sub-district.The system information of broadcasting can adopt the 15th type system information.
Subscriber equipment receives after the 15th type system information, check itself device type, if subscriber equipment is supported the WLAN interface, subscriber equipment sends a Location Request (LOCATING_REQUEST) message and gives gateway MLC so, comprises the ID of this sub-district and the access information of subscriber equipment in the Location Request.Gateway MLC receives after the Location Request, access authority with inquiring user, satisfy condition (this condition is the agreement of user and operator's negotiation) if insert authority, gateway MLC replys restoring to normal position (LOCATING_RESPONSE) message so, agrees to carry out the discovery of WLAN; Otherwise reply the location of returning a request failure.Subscriber equipment receives after the response message of location, if reply the location of failure, will stop the WLAN discovery procedure; Otherwise subscriber equipment finishes first stage, enters into second stage.Fig. 3 has provided the flow process in first stage.
Fig. 4 has provided the flow process of positioning stage.If gateway MLC agrees subscriber equipment is positioned, gateway MLC will be provided with a location interval T so P, this location information relevant with subscriber equipment at interval sends to SRNC in the lump as positioning command (LOCATING_COMMAND).SRNC will be provided with the location interval T P, and begin subscriber equipment is positioned according to the positioning flow of WCDMA, every T PTime is to gateway MLC report positioning result (LOCATING_RESULT).Gateway MLC will mate positioning result, the content of coupling is the position of subscriber equipment location and the position of WLAN, if m time matching result shows that subscriber equipment has entered the coverage of WLAN continuously, gateway MLC will send a scan command (SCANNING_COMMAND) and give subscriber equipment so.Here m is a system parameters, need select in real system, and the m minimum is 1.When m=1, when in a single day gateway MLC finds that subscriber equipment enters the coverage of WLAN, send scan command (SCANNING_COMMAND) immediately; But, do not enter the WLAN coverage so subscriber equipment may occur, but the phenomenon that is scanned by order because there is position error in the cellular network location.When m is big on the other hand, the coverage that subscriber equipment has entered WLAN may occur, but owing to do not reach matching times m time, gateway MLC does not send the situation of scan command, can delay the discovery of WLAN like this.
Fig. 5 has provided the flow process of sweep phase.The running parameter that in scan command (SCANNING_COMMAND) message of gateway MLC, will include WLAN, such as frequency, SSID (service set id), or the like.Subscriber equipment is after receiving this command messages, and subscriber equipment activates the wave point functional module of WLAN, carries out the scanning of WLAN.The mechanism of scanning may be drive sweep, perhaps active scan.The time of each scanning is T S, scanning be spaced apart TD.For IEEE 802.11b WLAN, suggestion surpasses 300 milliseconds sweep time, because the WLAN beacon interval is generally 100 milliseconds; Sweep spacing can be the interval of several seconds, such as 2 seconds.Maximum n time of user equipment scans WLAN is (for IEEE 802.11b network, the scope of the value of suggestion n is 3-5), if do not find WLAN after n time, subscriber equipment will be to gateway MLC reporting scanning result (SCANNING_RESULT), and resultant content is the scanning failure; If scanning discovery WLAN, subscriber equipment report scans successfully.If WLAN is not found in the scanning of subscriber equipment, subscriber equipment will check whether it has left the sub-district with WLAN, if so will be at the additional failure cause of failure content for leaving the sub-district with corpse equipment.
Fig. 6 has provided the FB(flow block) of WLAN discovery mechanism; It merges prior figures 3, Fig. 4 and Fig. 5, has provided the key step of machine-processed required experience.
Below the performance of WLAN discovery mechanism is analyzed.Definition:
P 1: subscriber equipment but is positioned in the probability within the WLAN coverage outside the WLAN coverage;
P 2: subscriber equipment and is positioned in probability within the WLAN coverage within the WLAN coverage;
In the real system, P 1Relevant with the positioning accuracy of cellular network, with the distance dependent of subscriber equipment and WLAN, also relevant with concrete network environment; And move P along with subscriber equipment 1Can change.Analyze intuitively in order to provide one, we suppose P 1Remain unchanged, i.e. interval T PLocation after time, subscriber equipment is outside the WLAN coverage, and the probability that but is positioned within the WLAN coverage remains unchanged; Similarly, suppose P 2Also remain unchanged.Obviously, P 1With P 2Embodied the positioning accuracy of razor clam nest network, can obtain by measuring at real system.
Utilize above-mentioned hypothesis, can obtain after continuous m time location, subscriber equipment is thought probability within the WLAN coverage, i.e. P mistakenly outside the WLAN coverage 1 mFig. 7 provides different m, different P 1Situation under, positioning result thinks that mistakenly the probability of subscriber equipment within the WLAN coverage, this probability promptly are the probability that cellular network activates WLAN scanning mistakenly; Can see that from Fig. 7 m is more little, P 1Big more, the probability that mistake activates WLAN scanning is also big more.Therefore, on this angle, the value of m should be bigger than normal.
But, on the other hand, when subscriber equipment within the WLAN coverage, but may be positioned in outside the WLAN coverage, and the m value is big more, the stand-by period that subscriber equipment needs is long more.Provide the time relation that the m value need be waited for subscriber equipment below.
In order to obtain the time that subscriber equipment need be waited for, need obtain the location number of times that subscriber equipment need be waited for.And know by the hypothesis of front, each locating user devices be properly oriented for the probability within the WLAN coverage be P 2, the probability that activates WLAN scanning after finish k location is the probability that the user need wait for k location.This probability then is that the result who occurs m location first continuously shows the probability of subscriber equipment in the WLAN coverage k location.In order to obtain this probability, we show that with positioning result the number of times of subscriber equipment in the WLAN coverage is state, set up a Markov Chain, as shown in Figure 8.Among the figure, the numeral subscriber equipment in the circle is positioned in the number of times in the WLAN coverage, and it has represented markovian state, arrow is represented the transfer between the state, shift according to certain probability between the state, such as in Fig. 8, the probability of transferring to himself from state 0 is 1-P 2, the probability of transferring to state 0 from state 1 to state m-1 also is 1-P 2, the probability of transferring to state 1 from state 0 is P 2, similarly, subscriber equipment is positioned in number of times in the WLAN coverage, and to add one probability all be P 2, last, the probability from state m-1 to state m is P 2In case state reaches m, show that website has had m positioning result continuously in WLAN, so subscriber equipment activates the WLAN scanning imaging system, so Markov Chain stops at state m.
According to markovian character, we can know that state m is an absorbing state, if definition G (k) is markovian soak time distribution vector, its element is g i(k) expression is from state i, through k step, the absorbed probability of Markov Chain, i.e. G (k)={ g 0(k), g 1(k) ..., g M-1(k) }.G so 0(k) be subscriber equipment activates WLAN scanning after locate through k time the location first probability.According to markovian character, we have
G(k)＝Pk -1(I-P)e (1)
Wherein, I is a unit matrix, and e is the unit column vector, P be m state before the Markov Chain probability transfer matrix (notes: this Markov Chain has m+1 state, and P be state 0,1,2 ..., the transition probability between m-1}),
Figure A20051001212900121
From top (1) formula, can obtaining subscriber equipment, to need the stand-by period be the probability g of k 0(k), and then can to obtain the average time that subscriber equipment need wait for be that K is as follows,
K = Σ j = m ∞ j g 0 ( k = j ) - - - ( 3 )
When Fig. 9 has provided different m respectively, positioning accuracy P 2The user does not on average need the location number of times waited for simultaneously.As can be seen from the figure, during given positioning accuracy, promptly given P 2The time, number of times to be positioned such as large user's equipment needs is many more more for m.It should be noted that the location number of times is multiplied by the location interval T PBe the time that subscriber equipment need be waited for, i.e. KT PTherefore, m is big more, and the time that subscriber equipment need be waited for is long more.
From last surface analysis as can be seen, m can be used as a selection of network design, and m specifically chooses the positioning accuracy what value depends on network of network.Provide the m span of suggestion below.
A) work as P 1＜0.1, P 2During=[0.1,1], m=1;
B) work as P 1=(0.1,0.3], P 2During=[0.1,1], m=1,2, optional one;
C) work as P 1=[0.3,0.5], P 2During=[0.1,0.6], m=1;
D) work as P 1=(0.3,0.5], P 2During=[0.6,1], m=1,2,3, optional one;
E) work as P 1=[0.5,1], P 2During=[0.1,0.5], the positioning accuracy extreme difference, m=2 is selected in suggestion;
F) work as P 1=[0.1,0.5], P 2During=[0.6,1], m=1,2,3,4,5, optional one.

Claims (2)

1. based on the WLAN (wireless local area network) discover method of cellular network location, it is characterized in that: described method is the Wideband Code Division Multiple Access (WCDMA) that meets the 3G (Third Generation) Moblie standard following, promptly realizes in the network of WCDMA, and described WCDMA network contains:
(1) Node B;
(2) service wireless network controller is designated as SRNC, links to each other with Node B by Iub interface;
(3) radio network controller is designated as RNC, links to each other with Node B by Iub; Described RNC links to each other with described SRNC by the Iur interface simultaneously;
(4) third generation mobile switching centre/Visited Location Registor is designated as 3G MSC/VLR, links to each other with described SRNC by the Iu interface;
(5) third generation service gateway nodes is designated as 3G SGSN, links to each other with described SRNC by Iub interface;
(6) Gateway Mobile Location Center is designated as gateway MLC, links to each other with 3G MSC/VLR with described 3G SGSN respectively by Lg interface;
(7) attaching position register is designated as HLR, links to each other with described gateway MLC by the Lh interface;
(8) external server links to each other with described gateway MLC by the Lh interface; Described method realizes according to the following steps:
(1) following functional module is set in described WCDMA network system:
1) location survey module, be arranged in Node B and the subscriber equipment, according to the measurement request of described SRNC to measuring from position information of user equipment, measurement result is passed to described SRNC, perhaps spontaneously periodically carry out signal measurement and measurement result is passed to described SRNC;
2) Serving Mobile Location Center module, i.e. SMLC module, this module is arranged among the described SRNC, so that when being used as a plurality of subscriber equipmenies location, the priority of scheduling location; Be used to calculate the position of subscriber equipment, and carry out different Coordinate Conversion, estimate locating accuracy; Also collaborative simultaneously and control subscriber equipment positions;
3) among the described gateway MLC or with described external server that gateway MLC links to each other in, store WLAN (wireless local area network), i.e. WLAN is with the geographical position coordinates information of cellular network;
(2) subscriber equipment judges whether the in-house facility type supports wireless lan interfaces: as if not possessing wireless lan interfaces, constipation bundle after receiving the message that shows this Node B and the coexistence of described WLAN (wireless local area network) that Node B is sent with No. 15 system information; Otherwise, just send a locating request message to described gateway MLC, comprising the identification code ID of this cellular cell and the access information of subscriber equipment by affiliated WCDMA network; Described No. 15 system information is a kind of of the message broadcasted in cell range of WCDMA network, and broadcast is numbered No. 15 under it;
(3) gateway MLC judges whether user right satisfies condition:
1) if user right does not satisfy condition, gateway MLC replys to the location that subscriber equipment sends the request failure, subscriber equipment constipation Shu Faxian operation;
2) if user right satisfies condition, gateway MLC agrees to carry out the discovery of WLAN (wireless local area network) just to subscriber equipment echo reply message;
(4) gateway MLC sends a positioning command that comprises the location interval T P that is used for gateway MLC setting to described service network controller;
(5) after described service wireless network controller receives the positioning command that gateway MLC sends, location interval T P just is set, and the positioning flow according to described WCDMA begins to report positioning result every the time of a described location interval T P to gateway MLC simultaneously to the subscriber equipment location;
(6) after gateway MLC receives positioning result in the step (5), come according to the position of the subscriber equipment of wherein describing that to carry out matching ratio right with the position of WLAN (wireless local area network), in case the match is successful, it is the coverage that subscriber equipment has entered WLAN (wireless local area network), gateway MLC just sends a scan command to subscriber equipment, wherein contains the running parameter of WLAN (wireless local area network); Affiliated matching times preestablishes, but is at least once;
(7) after subscriber equipment was received the scan command described in the step (6), just the wireless lan function module in the excited users equipment had been carried out wireless local area network scan by the maximum scan number of times that presets, and wherein, the time set of each scanning is T S, sweep spacing is made as T D, wherein, T SAnd T DBe default parameter;
(8) subscriber equipment, just scans successfully to gateway MLC report if found WLAN (wireless local area network) by the described scan operation of step (7); If after arriving the maximum scan number of times, do not find WLAN (wireless local area network), just report the scanning failure to gateway MLC, if subscriber equipment is found oneself to have left former cellular cell at this moment, just in the scanning failed message content of report, add failure cause;
(9) finish the operation that this finds WLAN (wireless local area network).
2, the WLAN (wireless local area network) discover method based on the cellular network location according to claim 1 is characterized in that the matching times in the described step (6) is promptly located matching times and chosen by following 6 kinds of situations:
2.1. work as P 1＜0.1, P 2During=[0.1,1], m=1;
2.2. work as P 1=(0.1,0.3], P 2During=[0.1,1], m=1,2, optional one;
2.3. work as P 1=[0.3,0.5], P 2During=[0.1,0.6], m=1;
2.4. work as P 1=(0.3,0.5], P 2During=[0.6,1], m=1,2,3, optional one;
2.5. work as P 1=[0.5,1], P 2During=[0.1,0.5], the positioning accuracy extreme difference, m=2 is selected in suggestion;
2.6. work as P 1=[0.1,0.5], P 2During=[0.6,1], m=1,2,3,4,5, optional one;
Wherein, m is the location number of times,
P 1For subscriber equipment outside the WLAN (wireless local area network) coverage, but be positioned in the probability within the WLAN (wireless local area network) coverage;
P 2For subscriber equipment within the WLAN (wireless local area network) coverage, and be positioned in probability within the WLAN (wireless local area network) coverage;
Described P 1, P 2Value in real system by measure obtaining.
CNB2005100121295A 2005-07-08 2005-07-08 Wireless local-network discovering method based on honeycomb network positioning Expired - Fee Related CN100372440C (en)

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