CN100512514C - Positioning method applied in multi carrier frequency system - Google Patents
Positioning method applied in multi carrier frequency system Download PDFInfo
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- CN100512514C CN100512514C CNB2004100887416A CN200410088741A CN100512514C CN 100512514 C CN100512514 C CN 100512514C CN B2004100887416 A CNB2004100887416 A CN B2004100887416A CN 200410088741 A CN200410088741 A CN 200410088741A CN 100512514 C CN100512514 C CN 100512514C
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Abstract
This invention relates to one positioning method applied in load system, which comprise the following steps: storing UE examples in RNC and adding original service area label, current area label and switch or area overlapping area update time and stamp information; in the triggered area process, the UE moving to the area RNC updating or establishing database of the original service area label, current service area label and the time stamp information; the network side receiving the positioning requirements based on area label; if the requirement is triggered in switching the UE or updating then according to the labels to use the two area overlapping area position information as the UE current position information.
Description
Technical field
The present invention relates to wireless telecommunication system, relate in particular to the method for determining mobile subscriber's geographical position in the TD-SCDMA system
Background technology
Mobile location service in the Radio Network System is subjected to extensive concern day by day.Its main application has: the emergency calling position service that is used for user security; Follow the tracks of the location of relevant criminal activity; Individual's positioning service (for example inquiry of service industry such as traffic, lodging information); Intelligent transportation transportation location; The design of Radio Network System and resource management; Be used for the charging (determining the communication cost of some position according to calling rate) of Radio Network System etc.
Now two classes are realized having usually in the location in the Radio Network System: to be the mobile subscriber determine geographical position (promptly based on UE situation) by the information independence of the measurement of wireless signal and peripheral cell base station to a class, and a class is the network side of wireless network measurement and the base station information of the peripheral cell geographical position (being the situation that UE assists) of finally determining the mobile subscriber by wireless signal.
The 3G (Third Generation) Moblie project organization (3GPP) has been stipulated three kinds of localization methods to TD-SCDMA: based on the localization method of cell ID (Cell Id, Cell Identification); The time of advent that observes poor (OTDOA, Observed Time Difference of Arrival) localization method; The global positioning system of network assistance (A-GPS) localization method.
Localization method based on Cell Id in above-mentioned three kinds of methods is the geographical position of describing UE (portable terminal) with the coverage of sub-district, so precision is very low, can determine that according to the different of cell coverage area the geographical position scope of UE is also different, but calculate simple, easy to operate, only need inquiry to be stored in the position of base station in the network side data storehouse and the positional information that covering radius just can obtain UE in advance, generally adopting such localization method positioning accuracy scope is 100m～20km.
The positioning accuracy of OTDOA can reach 50m～500m, but adopt the OTDOA localization method need increase LMU equipment, and need at least three sub-districts to participate in measuring process, so this method comparison based on the localization method of cell ID, is to increase the prerequisite that is calculated as of functional module and complexity though precision has raising.
The GPS localization method of network assistance utilizes the satellite-signal in space to measure, and need add receiving equipment on ground and increase the satellite-signal receiver on mobile device, needs the high-level signaling on the wave point to participate in the transmission auxiliary data.The GPS positioning accuracy of network assistance can reach 5m～50m, is the highest localization method of present positioning accuracy, but owing to need the message transmission of additional satellite receiver and wave point, so to the poor compatibility of existing equipment.
Before front page TD-SCDMA rower, TD-SDMA system and WCDMA system similarity, a geographic area has a plurality of alien frequencies with the sub-district that covers, as shown in Figure 1.Network side can be according to cell load, allows the UE under the dedicated mode switch to a sub-district that load is light from a heavy sub-district of load.Therefore, when the UE that causes owing to the load reason switches, these two sub-districts (current service cell after former Serving cell before switching and the switching) may be the same coverage cell of alien frequencies, and UE can't dwindle the position range of UE according to the Cell-ID of two sub-districts, improves the positioning accuracy of UE.In rower, stipulate, network side is abandoned current Location Request when UE switches, after UE finishes switching, again initiate positioning service again, if this locate mode is Cell ID, then according to the cell ID of current service cell, determine the position of UE, the positioning accuracy of UE is: the concentric circles that cellular-site location+coverage radius of cell constituted when the sub-district is sector cell, then is a sector.
And in front page TD-SCDMA rower, added overloading content frequently.In the multi-carrier frequency cell of TD-SCDMA system, a geographic area can only have a sub-district to exist, can there be one or more carrier frequency this sub-district, each carrier frequency can resident UE, but has only a cell ID (Cell-ID), the multi-carrier frequency cell of TD-SCDMA system that Here it is.
Agreement according to the front page rower, when the traffic carrying capacity of the resident assistant carrier frequency of UE increases when too much, network can be moved to UE on the light assistant carrier frequency of load from the heavy assistant carrier frequency of loading, migration between this carrier frequency occurs in the inside of a sub-district, and the switching of minizone can not take place, promptly can not trigger the switching flow of UE.Have only the UE (except that URA_PCH state) under connection mode of working as to move to new sub-district from former sub-district, just can trigger the switching flow of UE or initiate the cell updating course that the sub-district gravity treatment triggers, and former Serving cell is same scarcely with the geographic coverage of current service cell that moves to.This alien frequencies that may exist before being different from is with the sub-district that covers.Promptly according to the front page rower, UE can not switch owing to the load reason, only may be owing to the mobility reason switch, and also this switching must be that switch the minizone of different geographic regions.
In the location technology of TD-SCDMA system, be that network must be supported based on the location technology of Cell ID.If but in multi-carrier frequency cell, adopt present localization method, promptly in the Cell ID locate mode behind the cell update of switching or sub-district gravity treatment triggering, network only adopts current service cell to identify and locatees, and does not just make full use of the active position information that UE just has been in the switch area and improves positioning accuracy.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of localization method that is applied in the multi-carrier frequency system, can improve the positioning accuracy based on the cell ID location.
In order to solve the problems of the technologies described above, the invention provides a kind of localization method that is applied in the multi-carrier frequency system, may further comprise the steps:
(a) increase the information of " former Serving cell sign ", " current service cell sign " and " cell update that switching or sub-district gravity treatment trigger timestamp constantly " in the portable terminal example record of in radio network controller, preserving;
(b) in the cell updating course that the switching of portable terminal or sub-district gravity treatment trigger, " the former Serving cell sign " of the wireless network controller updates of the sub-district that this portable terminal moved to or newly-built this portable terminal example record, " current service cell sign " and " switch or the cell update moment that the sub-district gravity treatment triggers timestamp " information;
(c) network side is received the Location Request based on cell ID, if this Location Request is when the cell update that portable terminal switches or the sub-district gravity treatment triggers, or behind the cell update of switching or sub-district gravity treatment triggering, initiate in the setting-up time, carry out next step;
(d) network side is according to the former Serving cell before and after the cell update that described portable terminal switches or the sub-district gravity treatment triggers and the cell ID of current service cell, with the geographical location information of this overlapping region, two sub-districts positional information as this current place of portable terminal.
Further, above-mentioned localization method also can have following characteristics: described step (d) is after obtaining described overlapping region, network side also utilizes the arrival angle of this portable terminal to obtain the zone that this arrival angle in the described overlapping region is covered, as the position at this current place of portable terminal.
Further, above-mentioned localization method also can have following characteristics: in the described step (a), the example of described portable terminal record is to be index with the URTAN Radio Network Temporary Identifier.
Further, above-mentioned localization method also can have following characteristics: in the described step (b), when switching between the different districts of described portable terminal in same radio network controller or during cell update that the sub-district gravity treatment triggers, this radio network controller is made amendment in the following manner to original record of this portable terminal: the new Cell Radio Network Temporary Identifier/Identity, Cell-RNTI that distributes according to this radio network controller is revised the content of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI field; Content with field " current service cell sign " covers in " former Serving cell sign " field; The cell ID of the new sub-district that described portable terminal is switched to writes " current service cell sign " field; This switching instant is write " cell update that switching or sub-district gravity treatment trigger timestamp constantly " field.
Further, above-mentioned localization method also can have following characteristics: in the described step (b), when described portable terminal switches between the sub-district of different networks controller, when perhaps described portable terminal carries out the cell update of sub-district gravity treatment triggering between the different networks controller, former radio network controller is with the former Serving cell sign notification target radio network controller of this portable terminal, the former Serving cell sign of target radio network controller this portable terminal of record in the example that background data base is set up for this portable terminal, the information of the cell update timestamp constantly that current service cell sign and switching this time or sub-district gravity treatment trigger.
Further, above-mentioned localization method also can have following characteristics: in the described step (b), when described portable terminal is followed the direct-cut operation of reorientation between different radio network controllers, reorientation flow process by former radio network controller, in sending to the former radio network controller reorientation message of target radio network controller, increase new information unit: " former Serving cell sign ", and the content of " current service cell sign " field of this portable terminal in the former radio network controller background data base is increased in this " former Serving cell sign " information unit.
Further, above-mentioned localization method also can have following characteristics: in the described step (b), when described portable terminal carries out the cell update of sub-district gravity treatment triggering between different radio network controllers, in former radio network controller sends to the Radio Resource control container of target radio network controller, increase new information unit " former Serving cell sign ", and the content of " current service cell sign " field of this portable terminal in the former radio network controller background data base is increased in this " former Serving cell sign " information unit.
Further, above-mentioned localization method also can have following characteristics: in the described step (c), described radio network controller is that the initiation of Location Request is compared with the cell update timestamp constantly that the switching or the sub-district gravity treatment of this portable terminal trigger constantly, judge whether less than or smaller or equal to the time interval of setting.
Further, above-mentioned localization method also can have following characteristics: the geographical location information of having stored the overlapping region of per two sub-districts in the database of network side, in the described step (d), network side obtains the overlapping region of these two sub-districts according to the former Serving cell before and after the cell update that described portable terminal switches or the sub-district gravity treatment triggers and the cell ID of current service cell by inquiry.
Further, above-mentioned localization method also can have following characteristics: also stored each arrival zone that angular range covered in the described overlapping region in the database of network side, in the described step (e), network side obtains the zone that this arrival angle in the described overlapping region is covered according to the arrival angle of described portable terminal by inquiry.
As from the foregoing, the present invention is by improving the localization method based on cell ID, UE at the cell update of just having finished switching or sub-district gravity treatment triggering in the multi-carrier frequency system of TD-SCDMA, utilize former Serving cell sign and current service cell sign to inquire about or calculate the address location information of overlapping region, two sub-districts, thereby determine the position at the current place of UE, improved positioning accuracy based on cell ID.And this localization method, do not need to increase new measuring process, do not increase too much calculating yet, do not need to increase the network equipment, realize very simply, be a kind of very effective localization method based on cell ID.
Description of drawings
Fig. 1 is that alien frequencies is with the schematic diagram that covers a plurality of sub-districts.
Fig. 2 is the schematic diagram of the overlapping region between the omni cell.
Fig. 3 is the schematic diagram of the overlapping region between the sector cell.
Fig. 4 is that the embodiment of the invention utilizes smart antenna to obtain the schematic diagram of littler orientation range.
Embodiment
In present TD-SCDMA system, the mode of operation of UE (portable terminal) has two kinds: connection mode and idle pulley.
Under the idle pulley, UE enters new sub-district when (comprising that UE is in new sub-district start) in the roaming mode, network does not know UE is in which sub-district, RNC is the example record of this UE not, to newly-built RRC (Radio Resource Control, Radio Resource control) when connecting, RNC example of this UE under the newly-built connection mode in background data base, comprise URNTI (URTAN Radio Network TemporaryIdentity, the URTAN Radio Network Temporary Identifier), CRNTI information such as (Cell Network TemporaryIdentity, Cell Radio Network Temporary Identifier/Identity, Cell-RNTIs).
Connection mode comprises four kinds of state: CELL_DCH (single user state), CELL_PCH, CELL_FACH and URA_PCH.Under the CELL_DCH, UE enters new sub-district and adopts the mode of switching, and adopts the direct-cut operation of following reorientation in the TD-SCDMA system at present; Under CELL_PCH and the CELL_FACH state, after UE entered new sub-district from former sub-district, UE initiated the cell updating course that the sub-district gravity treatment triggers.After UE entered new sub-district from former sub-district under the URA_PCH state, UE initiated URA and upgrades, and network is not known which sub-district of UE under which RNC control, and RNC is the example record of this UE not.
UE moves to a new sub-district can be divided into moving between the interior mobile and RNC of RNC again.When UE switches between the different districts of RNC inside or the sub-district gravity treatment triggers cell update, the RNC background data base does not change URNTI for the example of this UE, but changes CRNTI; And between RNC, switch or during cell update that the sub-district gravity treatment triggers, the background data base of former RNC can be deleted this UE example as UE, the RNC of the new sub-district that moves to is at newly-built this UE example of background data base.
In order to utilize the characteristics of multi-carrier frequency cell in the TD-SCDMA system, promptly, different sub-districts must cover different geographic areas, alien frequencies can not appear with a plurality of sub-districts that cover, the present invention to switch or cell update that the sub-district gravity treatment triggers after UE location in the short time, determine the position of UE by the overlapping region of inquiring about new and old two Serving cells, thereby improve positioning accuracy based on the cell ID location.
Embodiment of the invention method may further comprise the steps:
Step 1, increase the cell update timestamp (SWITCH_TIME) constantly that three former Serving cell signs of field: UE (CELL_ID_OLD), UE current service cell sign (CELL_ID_NEW) and switching or sub-district gravity treatment trigger in the UE example record of in the RNC background data base, preserving, this record with URNTI is index, and is as shown in the table:
| URNTI | CRNTI | ... | CELL_ID_OLD | CELL_ID_NEW | SWITCH_TIME |
When entering in the roaming mode that newly-built RRC connects behind the new sub-district for UE, the example of this newly-built UE can only write UE current service cell sign in the RNC background data base.
Step 2, UE under the CELL_DCH state moves to a switching between the triggering cell of new sub-district, perhaps the UE under CELL_PCH and the CELL_FACH state moves to a new sub-district triggering cell when upgrading (triggering reason is the sub-district gravity treatment), and the RNC of the sub-district that UE moved to upgrades or preserves the cell update timestamp constantly that former Serving cell sign, current service cell sign and switching in the example record of this UE or sub-district gravity treatment trigger;
UE under the CELL_DCH state moves to a new sub-district and comprises switching in the RNC and the switching between the RNC.UE under CELL_PCH and the CELL_FACH state moves to a sub-district and comprises cell update in the RNC and the cell update between the RNC.
When carrying out between the different districts of UE in same RNC of (except the URA_PCH state) under the connection mode when mobile, RNC inquires the URNTI of this UE in the RNC background data base, and the legacy data storehouse record of this UE is made amendment in the following manner:
Revise the content of CRNTI field, that is: the new CRNTI that distributes with RNC is the content of CRNTI field;
Revise the content of former Serving cell identification field, that is: the content with field " current service cell sign " covers in " former Serving cell sign ";
Revise the content of field " current service cell sign ", that is: the cell ID of the new sub-district that moves to UE is " a current service cell sign ";
The content of modification field " cell update that switching or sub-district gravity treatment trigger timestamp constantly " serves as the timestamp in the cell update moment of switching or sub-district gravity treatment triggering with this constantly that is:.
When the UE of (except the URA_PCH state) moves in the minizone of different RNCs under the connection mode, former RNC is with the former Serving cell sign notification target RNC of this UE, and Target RNC writes former Serving cell sign, the current service cell sign of this UE and the cell update timestamp constantly that this switches or the sub-district gravity treatment triggers in the example that background data base is set up for this UE.
When UE follows the direct-cut operation of reorientation between different RNC, its process is as follows: by former RNC reorientation flow process, pass in the former RNC reorientation message (SRNS RELOCATION INFO) of Target RNC (Target RNC) at former RNC (SRNC), increase new information unit " former Serving cell sign (CELL_ID_OLD) ", in order to transmit the cell ID of former Serving cell, it derives from the background data base of SRNC.That is: SRNC is increased to the content of " current service cell sign " field of this UE in the background data base in " former Serving cell sign " information unit in the message.
Target RNC is exactly the new Serving RNC of following behind the direct-cut operation of reorientation, distributes new URNTI sign must for this UE, and the cell update that record switches or the sub-district gravity treatment triggers constantly simultaneously.Be new Serving RNC in this RNC background data base, be index with URNTI, increase new UE example record, as shown in the table:
| URNTI | CRNTI | ... | CELL_ID_OLD | CELL_ID_NEW | SWITCH_TI ME |
| The new distribution | The new distribution | From SRNS RELOCATION INFO | Increase newly | Switching time |
When UE carries out the cell update of sub-district gravity treatment triggering between different radio network controllers, send in the RRC container (RRCcontainer) of target radio network controller at former radio network controller, increase new information unit " former Serving cell sign ", and the content of " current service cell sign " field of this portable terminal in the former radio network controller background data base is increased in this " former Serving cell sign " information unit.
Step 3, network side (referring generally to be in the locating module in the core net) is for the Location Request of receiving based on cell ID, judge whether this Location Request is when the cell update of switching or sub-district gravity treatment triggering, or behind the cell update of switching or sub-district gravity treatment triggering, initiate in the setting-up time, if, carry out next step, otherwise handle, promptly only locate with the cell ID of current service cell by normal positioning flow;
The localization method of present embodiment can be applied to following two kinds of situations: initiate Location Request during cell update that situation one, switching or sub-district gravity treatment trigger, network side is abandoned this UE Location Request, by the time after the cell update that switching or sub-district gravity treatment triggers was finished, network side was initiated in the position fixing process of this UE again; Than location request initiating in the short time, network side is initiated in the position fixing process of this UE behind the cell update that situation two, UE switching or sub-district gravity treatment trigger.
According to a kind of situation in back, when network side is initiated the position fixing process of UE, at first need to inquire about the timestamp that this UE enters current service cell, and compare with the cell update timestamp constantly that the switching of this portable terminal or sub-district gravity treatment trigger, if less than or smaller or equal to the time interval of setting, think that then this Location Request initiates at short notice, illustrate that UE has just finished the cell updating course of switching or sub-district gravity treatment triggering, still in the overlapping region of two sub-districts, thereby can adopt localization method of the present invention; If in the time interval interval greater than setting, illustrate then before UE for a long time and just finished handoff procedure that UE has left the overlapping region of two sub-districts probably, can not adopt localization method of the present invention.
Step 4, network side obtain the geographical location information of this overlapping region, two sub-districts according to the cell ID of former and later two sub-districts of cell update (former Serving cell and current service cell) of UE switching or sub-district gravity treatment triggering;
In the network side database relevant with positioning service, the base station coordinates and the coverage of each sub-district have been stored, and set up the one-to-one relationship table in cell ID and geographical position, present embodiment has also been stored the geographical location information of the overlapping region of per two sub-districts, and Fig. 2 and Fig. 3 show the overlapping region between omni cell and the sector cell respectively.Switch the sign of two sub-districts of front and back according to UE, network side promptly can be inquired about and obtain its overlapping region.
Step 5, network side are utilized the arrival angle (Arrive of Angle) of this UE that the base station obtains, further determine the current location of UE in the described overlapping region that obtains.
The position that previous step will just be finished the UE after the switching suddenly is limited to the overlapping region of two sub-districts before and after switching.This step is utilized the intelligent antenna technology of base station, it is the direction that the antenna of base station can be aimed at UE, obtain the arrival angle (Arrive of Angle) of UE, thereby the orientation range of UE is reduced into the zone that the respective angles scope in the overlapping region is covered, shadow region has as shown in Figure 4 been improved positioning accuracy further.The zone that each angular range covered in this overlapping region also can be stored in the database in advance, obtains by inquiry.
Claims (10)
1, a kind of localization method that is applied in the multi-carrier frequency system may further comprise the steps:
(a) increase the information of " former Serving cell sign ", " current service cell sign " and " cell update that switching or sub-district gravity treatment trigger timestamp constantly " in the portable terminal example record of in radio network controller, preserving;
(b) in the cell updating course that the switching of portable terminal or sub-district gravity treatment trigger, " the former Serving cell sign " of the wireless network controller updates of the sub-district that this portable terminal moved to or newly-built this portable terminal example record, " current service cell sign " and " switch or the cell update moment that the sub-district gravity treatment triggers timestamp " information;
(c) network side is received the Location Request based on cell ID, if this Location Request is when the cell update that portable terminal switches or the sub-district gravity treatment triggers, or behind the cell update of switching or sub-district gravity treatment triggering, initiate in the setting-up time, carry out next step;
(d) network side is according to the former Serving cell before and after the cell update that described portable terminal switches or the sub-district gravity treatment triggers and the cell ID of current service cell, with the geographical location information of this overlapping region, two sub-districts positional information as this current place of portable terminal.
2, localization method as claimed in claim 1, it is characterized in that, described step (d) is after obtaining described overlapping region, network side also utilizes the arrival angle of this portable terminal to obtain the zone that this arrival angle is covered in the described overlapping region, as the positional information at this current place of portable terminal.
3, localization method as claimed in claim 1 or 2 is characterized in that, in the described step (a), the example of described portable terminal record is to be index with the URTAN Radio Network Temporary Identifier.
4, localization method as claimed in claim 1 or 2, it is characterized in that, in the described step (b), when switching between the different districts of described portable terminal in same radio network controller or during cell update that the sub-district gravity treatment triggers, this radio network controller is made amendment in the following manner to original record of this portable terminal: the new Cell Radio Network Temporary Identifier/Identity, Cell-RNTI that distributes according to this radio network controller is revised the content of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI field; Content with field " current service cell sign " covers in " former Serving cell sign " field; The cell ID of the new sub-district that described portable terminal is moved to writes " current service cell sign " field; The cell update of this switching or sub-district gravity treatment triggering is write " cell update that switching or sub-district gravity treatment trigger timestamp constantly " field constantly.
5, localization method as claimed in claim 1 or 2, it is characterized in that, in the described step (b), when described portable terminal switches between the sub-district of different networks controller, when perhaps described portable terminal carries out the cell update of sub-district gravity treatment triggering between the different networks controller, former radio network controller is with the former Serving cell sign notification target radio network controller of this portable terminal, the former Serving cell sign of target radio network controller this portable terminal of record in the example that background data base is set up for this portable terminal, the information of the cell update timestamp constantly that current service cell sign and switching this time or sub-district gravity treatment trigger.
6, localization method as claimed in claim 5, it is characterized in that, in the described step (b), when described portable terminal is followed the direct-cut operation of reorientation between different radio network controllers, reorientation flow process by former radio network controller, in sending to the former radio network controller reorientation message of target radio network controller, increase new information unit: " former Serving cell sign ", and the content of " current service cell sign " field of this portable terminal in the former radio network controller background data base is increased in this " former Serving cell sign " information unit.
7, localization method as claimed in claim 5, it is characterized in that, in the described step (b), when described portable terminal carries out the cell update of sub-district gravity treatment triggering between different radio network controllers, in former radio network controller sends to the Radio Resource control container of target radio network controller, increase new information unit " former Serving cell sign ", and the content of " current service cell sign " field of this portable terminal in the former radio network controller background data base is increased in this " former Serving cell sign " information unit.
8, localization method as claimed in claim 1 or 2, it is characterized in that, in the described step (c), described radio network controller is that the initiation of Location Request is compared with the cell update timestamp constantly that the switching or the sub-district gravity treatment of this portable terminal trigger constantly, judge whether less than or smaller or equal to the time interval of setting.
9, localization method as claimed in claim 1, it is characterized in that, in the database of network side, stored the geographical location information of the overlapping region of per two sub-districts, in the described step (d), network side obtains the overlapping region of these two sub-districts according to the former Serving cell before and after the cell update that described portable terminal switches or the sub-district gravity treatment triggers and the cell ID of current service cell by inquiry.
10, localization method as claimed in claim 2, it is characterized in that, in the database of network side, stored each arrival zone that angular range covered in the described overlapping region, in the described step (e), network side obtains the zone that this arrival angle in the described overlapping region is covered according to the arrival angle of described portable terminal by inquiry.
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| CNB2004100887416A CN100512514C (en) | 2004-11-02 | 2004-11-02 | Positioning method applied in multi carrier frequency system |
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| CNB2004100887416A CN100512514C (en) | 2004-11-02 | 2004-11-02 | Positioning method applied in multi carrier frequency system |
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| CN101272584B (en) * | 2008-04-03 | 2012-01-11 | 中兴通讯股份有限公司 | Resource allocation method |
| US8838089B2 (en) * | 2008-10-20 | 2014-09-16 | Htc Corporation | Method of improving radio resource control connenction establishment in a wireless communication system and related communication device |
| ATE515912T1 (en) * | 2009-05-29 | 2011-07-15 | Ericsson Telefon Ab L M | MOBILE-ASSISTED HANDOVER IN MOBILE COMMUNICATION NETWORKS |
| EP3255941B1 (en) | 2015-04-20 | 2020-10-21 | Huawei Technologies Co., Ltd. | Mobile terminal positioning method and apparatus |
| WO2017020273A1 (en) * | 2015-08-05 | 2017-02-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and device for positioning and method of generating a positioning database in multicarrier network |
| CN106199647B (en) * | 2016-06-21 | 2019-02-01 | 华东师范大学 | A method of speculating unknown unmanned plane target position |
| CN106255204B (en) * | 2016-09-30 | 2020-05-15 | 香港中文大学深圳研究院 | Data communication method and system based on angle positioning system |
| US10573144B2 (en) | 2016-10-10 | 2020-02-25 | Netgear, Inc. | Changing topology in a wireless network |
| WO2023159460A1 (en) * | 2022-02-25 | 2023-08-31 | Qualcomm Incorporated | Detecting and reducing ping-pong handover |
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