CN1254144C - Network-evaluated handover assisted by both mobile and base-stations - Google Patents
Network-evaluated handover assisted by both mobile and base-stations Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
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Abstract
A telecommunications system as described wherein handovers are determined and specified based on both uplink and downlink conditions between a mobile radio and a neighboring cell case station. The mobile radio reports downlink conditions for neighboring cells to a network which instructs the neighboring cell base station to report an uplink condition from the mobile station. The network report handover specifications and mobile station power level based on the uplink and downlink condition information.
Description
Invention field
The present invention relates to wireless communication system, more specifically, relate to the method and apparatus that between adjacent sub-district, switches mobile radio station effectively.
Background of invention and summary
In typical cellular wireless system, the geographic area is divided into the sub-district that service is provided by the base station that is connected to wireless network.That each user (mobile subscriber) in the cellular wireless system is equipped with is portable, pocket, hand-hold type or be installed in travelling carriage on the automobile, they and mobile network communication voice and/or data.Each base station comprises a plurality of Channel Elementss, they comprise transmitter, receiver and controller, and be equipped with and be used on all directions the omnidirectional antenna of emission equally, or directional antenna being equipped with, each directional antenna is served a specific shape sub-district, sector.Each travelling carriage also comprises transmitter, receiver, controller and user interface, and by specific travelling carriage identifier identification.First public mobile radio system proposed in later stage in the 1970's and initial stage in the 1980's.As a set, those systems of knowing now are called as " first generation " system.They comprise U.S.'s " Advanced Mobile Phone System " (AMPS), " Nordic Mobile Telephone System " of Scandinavia (NMT), " total access communication system " of Britain (TACS) and " the Japanese mobile telephone system " of Japan (NAMTS).They have some common transmission characteristic usually, such as, the wireless simulation frequency modulation(FM) in network and digital control.Yet each system uses unique communication standard with respect to other system.
In traditional analog cellular system, when travelling carriage is the free time (not use Traffic Channel), it be tuned to and corresponding to the control channel of its current sub-district in the network and constantly it is monitored.Therefore, can constantly to determine whether to receive on control channel with it be the beep-page message of destination to travelling carriage.If then travelling carriage sends the base station that pages reply on control channel, the base station is forwarded to wireless network again paging reply.Receive page reply after, wireless network is selected an operational voice channel from wherein received the sub-district that pages reply once, and asks base station in this sub-district to set up one by control channel order travelling carriage directly to connect.
In addition, travelling carriage can access network, so that make a call by " transmission " button that dials phone number and push on the telephone bandset.Comprise that travelling carriage is known in addition number and the control signal of the telephone number dialed is sent to the base station by control channel, and be forwarded to wireless network, the latter verifies travelling carriage, distribution service channel and sets up and directly is connected.
Be established if travelling carriage connects simultaneously in moving between cells, " switching " of this connection then takes place between the sub-district.Switching can take place owing to the various changes that can occur in communicating by letter between travelling carriage and the network.When travelling carriage when communicating by letter with the single base station of serving the sub-district that travelling carriage is positioned, a kind of common switching appears.When travelling carriage was come new sub-district by new base station services from this sub-district, first base station switched to new base station to communication.Like this, when travelling carriage when providing the sub-district of service to move away by separately base station, travelling carriage finishes and the communicating by letter of first base station, and begins and the communicating by letter of second base station.
When the switching of another kind of type, travelling carriage may be receives redundant communication from a plurality of base stations, so that guarantee the quality transmitted.For example, on Fig. 1, wireless network core 100 is from network (not shown) received communication 102.And plan communication 102 is guided into mobile station MS by the Traffic Channel TCH that is used to communicate by letter that has set up.Wireless network core 100 is delivered to diversity to communication 102 and switches DHO entity 101, and it is the redundancy message of destination that the latter becomes signal segmentation with base station BS 1 and base station BS 2.Base station BS 1 is delivered to mobile station MS communicating by letter by same Traffic Channel TCH with BS2.The known technology that has diversity various, that be used to provide above-mentioned to switch.Because travelling carriage is by communications reception message redundant on Traffic Channel, therefore, select from the signal of Traffic Channel or by being combined in the signal that receives on the Traffic Channel by having an opportunity, can improve the quality of reception (and transmission) according to known agreement.
When travelling carriage when the A point moves to the B point, travel to and fro between the transmission between base station BS 1 and the BS2 and the quality of reception and change.From certain viewpoint of communication, mobile station MS and present base station BS1 and BS2 can obtain advantage from addition of base station BS3 in the diversity communication plan.That is to say that it is to communicate with current one group of base station (BS1 and BS2) that mobile station MS can be looked at as, and have adjacent base station (BS3) operational, conduct communication link standby person likely in the future.
Move to the process that B orders from the A point, base station 2 keeps during whole the advancing of travelling carriage and the communicating by letter of mobile station MS, and base station BS 1 can depend on signal quality with BS3 and keeps or do not keep communicating by letter.On Fig. 1, travelling carriage communicates by using Traffic Channel TCH, and the base station that is communicating with it with it is irrelevant.
Travelling carriage keeps the record of its present base station, and can test (or being subjected to indication to go test) adjacent sub-district, so that it is included in this record.According to the condition regulation, the base station of current communication is added in the current record, or is removed from current record.
Even in the scope of single base station, also can switch, as shown in Figure 2.On figure, the base station is shown as has four antenna A1-A4, has stipulated four geographic service area.Mobile station MS at position A place passes through Traffic Channel TCH and base station communication.At position A, travelling carriage is by to the reception of the redundancy of antenna A1 and A4/send and base station communication.Yet after moving to position B, mobile station MS can begin to receive and send to antenna A1 and A2.When travelling carriage when the A point moves to the B point, appear at the switching between antenna A1/A4 and the antenna A1/A2.
The benefit of diversity reception as illustrated in fig. 1 and 2/cut apart is: between base station and travelling carriage (situation of Fig. 2) and between wireless network core and travelling carriage (situation of Fig. 1) communicate by letter and never interrupt.Just, under the situation of Fig. 1, even even when travelling carriage when the A point moves to the B point and when it from the base station 1 when switching to base station 3, mobile station MS always keeps and the communicating by letter of wireless network core by base station 2.Similarly, under the situation of Fig. 2, even even when travelling carriage when the A point moves to the B point and when it when antenna A4 switches to antenna A2, mobile station MS keeps and the communicating by letter of antenna A1.
Owing to defined terms (such as the signal strength signal intensity between travelling carriage and receiver) occurs, situation switches.Under the situation of Fig. 1, for example, when travelling carriage (shows as scheming to go up by surge line) when the A point moves to the B point, can decision making: the signal strength signal intensity between mobile station MS and base station BS 3 is preferably suitable for carrying out and the communicating by letter of mobile station MS, rather than communicates with BS1.In the switching situation formerly, measure current radio condition between travelling carriage and adjacent sub-district (usually measure and report) and resources supplIes (find out by MS and measure free channel in the pointed sub-district) by MS by mobile station MS or base station (BS1-BS3).At present, generally be to measure the sub-district condition and the result is reported to network by MS, the resource of network based needs is estimated to switch.Yet this is problematic, because: as same condition, switch In the view of can expecting, but it seems from travelling carriage and may be able to not expect and switch from network.Just, network may wish to switch owing to some signal conditionings, but the switching condition that travelling carriage is thought then may be different, and vice versa.If be switched and determined by network, then no matter it can be done and like this travelling carriage condition.On the other hand, if switched by the net travelling carriage, then no matter it can be done and like this network condition.
In the present invention, travelling to and fro between the up link of mobile radio station and wireless network and down link signal all relates to switching and estimates.As long as up link and down link condition are not simultaneously or when close two the different network operators' of travelling carriage border, the present invention is useful especially in one network.Under such situation, be used for determining when the base station should measure the ul transmissions quality from travelling carriage with switching that relevant measurement report can be passed to wireless network and made by network from travelling carriage.These two measurements are used for making switching determination.
The present invention allows BS that MS is made some measurement, and this and MS carry out simultaneously to the measurement of BS.In addition, monitor up link under the situation that some BS sends on not by down link, rather than use existing down link delivering power control command from other BS.
The present invention also allows network correction channel and/or power level uplink conditions before air station switches to new Cell Broadcast CB zone.
The accompanying drawing summary
By the explanation of following preferred embodiment and the demonstration of accompanying drawing, will be appreciated that above-mentioned purpose, characteristic and advantage with other of the present invention, reference character refers to identical parts in the text on the figure.Though on many figure, show each functional block and parts, but those skilled in the art it will be appreciated that, these functions can be passed through each hardware circuit, pass through the digital microprocessor of suitably programming, pass through application-specific integrated circuit (ASIC) (ASIC), and/or are implemented by one or more digital signal processors (DSP).
Fig. 1 is the schematic diagram of the mobile radio communications system of simplification;
Fig. 2 is the schematic diagram of the travelling carriage-base station communication system of simplification;
Fig. 3 is schematically illustrating of travelling carriage-base station communication link;
Fig. 4 is schematically illustrating of the mobile station communication network simplified;
Fig. 5 is the schematically illustrating of wireless network controller that is connected to the simplification of base station;
Fig. 6 is schematically illustrating of the travelling carriage simplified;
Fig. 7 is the diagrammatic representation of the threshold value of the current group that adopted by the embodiment of example of the present invention and adjacent group;
Fig. 8 is schematically illustrating of the mobile communication system simplified, and wherein travelling carriage is by up link and down link and different base station communications; And
Fig. 9 is the schematically illustrating of embodiment of the example of the present invention used of the boundary between different network operators.
Accompanying drawing describes in detail
In the following description, in order to explain rather than to limit, set forth concrete details, such as certain embodiments, data flow, signaling embodiment, agreement, technology or the like, so that provide to understanding of the present invention.Yet, it will be apparent to those skilled in the art that the present invention can implement with other the embodiment that is different from these details.In other example, the detailed description of the method for knowing, interface, equipment and signaling technology is left in the basket, in order to avoid disturb explanation of the present invention with unnecessary details.
The present invention illustrates with the unrestriced example of universal mobile telecommunications shown in Figure 4 (UMTS) 10.A representational connection-oriented external core network is shown as cloud 12, and it for example can be public switch telephone network (PSTN) and/or Integrated Service Digital Network.Another is representational to be shown as cloud 14 towards disconnected external core network, and it for example can be the Internet.These two core net are coupled to corresponding business node 16.The connection-oriented network 12 of PSTN/ISDN is connected to the connection-oriented service node that is used to provide Circuit-switched business, such as mobile switching centre (MSC) node 18.In existing GSM model, MSC 18 is connected to base station sub-system (BSS) 22 by interface A, and the latter is connected to wireless base station 23 by interface A ' again.The Internet is connected to GPRS (GPRS) node 20 towards connectionless network 14, and it is by the business that packet-switched type is provided customized, and is called as sometimes the gprs service of service node (SGSN) is provided.Each core net service node 18 and 20 is connected to UMTS grounding wireless access network (UTRAN) 24 by wireless access network (RAN) interface.UTRAN 24 comprises one or more wireless network controllers 26.Each RNC 26 is connected to any other the RNC among a plurality of base stations (BS) 28 and the UTRAN 24.
Preferably, wireless access is based on Wideband Code Division Multiple Access (WCDMA) (WCDMA), wherein by using the CDMA spreading code to distribute each wireless channel.Certainly, also can adopt other cut-in method.WCDMA is provided for wide bandwidth and other the high transmission rate request and the reliable characteristic (switching and RAKE receiver such as diversity) of multimedia service, thereby guarantees high quality.Travelling carriage 30 uses transmission code, and like this, the transmission from specific travelling carriage 30 can be discerned in base station 28.In current WCDMA standard, suppose that code distributes to dedicated channel as follows:
(a) up link and downlink transmission are used channelization codes and at its scrambled code at top;
(b) channelization codes is determined spreading factor, and spreading factor is determined Maximum Bit Rate;
(c) in same sub-district, use the travelling carriage of same frequency and same spreading factor will use the different channelization codes that is used for downlink channel, but be to use same scrambled code;
(d) travelling carriage in other sub-district uses same channelization codes, but is to use different scrambled codes.
Scrambled code guarantees in different sub-districts to use the globality between the downlink transmission of same channelization codes.The scrambled code that uses in up link is guaranteed in same or different sub-districts from the globality between the ul transmissions of different travelling carriages.
Therefore, MS obtains its scrambled code, and will use public scrambled code but the unique channelization codes of use to the BS of specific travelling carriage transmission on dedicated channel.MS has the ability that the downlink transmission that will use different scrambled codes and different channelization codes combines (restriction of today is: the spreading factor from the channelization codes of all sub-districts must be identical).
The present invention can be used under the environment of the mobile communication system 10 of example shown in Figure 4, and wherein wireless network controller 26 and base station 28 are formed on the wireless access network between core net node (as MSC 16) and the travelling carriage 30.Under the switching situation formerly, travelling carriage is carried out the radio condition assessment, and network execution stock assessment, should switch so that determine whether.The subject matter that takes place as such result was one or owed a power condition that wherein for the condition that exists, this MS broadcasted too strong signal strength signal intensity or too weak signal strength signal intensity in adjacent switching cell.On the other hand, before network sends switching command, the present invention allows to be measured by network, and this operation will substitute the operation that receives measurement report from travelling carriage, and perhaps this operation (under more possible situation) will be carried out concurrently with the operation that receives measurement report from travelling carriage.
Fig. 3 shows these conditions in greater detail.When mobile station MS was in position A, Traffic Channel TCH provided from the mobile station MS to the base station BS 1 up link and the down link from base station BS 1 to mobile station MS.Communication quality between travelling carriage and base station is prescribed by reference uplink conditions and down link condition.When travelling carriage moves to position B, must be made in the switch decision between base station BS 1 and the base station BS 2.In order to ensure high quality communication,, the up link between this travelling carriage and the base station BS 1 and downlink communication quality make switch decision by being compared with the travelling carriage in the base station BS 2.
Particularly, if the switching between base station BS 1 and base station BS 2 only make by network, then network be uncertain of between mobile station MS and the base station BS 1 with respect to the down link condition between mobile station MS and the base station BS 2.Current agreement allows network to make the resource estimation, and no matter whether MS or BS make radio condition estimates.That is to say that MS can report radio condition information, make for network to be used for estimating to switch, or BS can provide radio condition to estimate according to uplink conditions.Radio condition information can be estimated by using the path loss of being measured by MS, but this information can measure more accurate degree significantly by BS.
Referring now to Fig. 1-3, the preferred embodiments of the present invention make travelling carriage giving RNC 100 about down link overview data report, and RNC uses this overview data to come the order handover operation.MS will use the BCCH channel to come to measure for the sub-district (promptly being included in the sub-district in the activation group) that it is communicated by letter with it.At position A, MS keeps the record of the present base station that it communicates by letter with it.MS also monitors the quality of the down link signal of adjacent sub-district continuously according to the quality of reception of common pilots channel.Alternatively, comprise the measurement that guiding bit with constant power output and any channel that covers whole sub-district can be used in neighbor cell.Therefore, when MS when position A moves to position B, MS measures the BCH down link condition from base station BS 3.When no matter when being above standard from the overview data of adjacent sub-district, MS just gives RNC 100 measuring overview data reports from these of down link.RNC informing base station (for example base station BS 3): MS is identification of base stations to be used for base station current and recent expection of communicating by letter.When travelling carriage when position A moves to position B, RNC 100 indication BS3 measure the uplink transmission power that receives from MS.If the high power (down link) that travelling carriage is sending (up link) and is being received in base station BS 3 (adjacent sub-district) with the high power by the base station report by the travelling carriage report, then RNC 100 uses existing its power level of link command travelling carriage reduction between MS-BS1 and MS-BS2 to arrive suitable glitch-free level, uses for the sub-district of BS3 regulation.By temporary transient reduction MS power output, the BS3 up link is protected not to be subjected to excessive interference, till being established in the mode of supporting fast power control fully at the Radio Link between MS and the BS3.
Base station BS 1 is gone up with the transmission channel TCH that BS2 continues formerly to have set up and is communicated by letter with mobile station MS.At first, between MS and BS3, only provide power controlling, until BS3 to RNC 100 report: till being in suitable level from the up link of MS.At this moment, RNC 100 notice MS: it should set up switching, (perhaps,, then from current report, remove the most weak base station and replace it) so that BS3 is included in its current communication statement with BS3 if the travelling carriage capacity no longer can be accepted the base station about TCH.Certainly, when RNC 100 is included in BS3 in the current report of the base station that is just communicating with travelling carriage on TCH at it, will notify transmitting power that mobile station MS goes to reduce it to suitable level.
Also might be ordered before its emission for a long time of beginning on the down link, be allowed BS3 receiving uplink and combined this up link and BS1 and BS2 at BS3.Owing to, can instruct MS reduce its power to the result who makes up from BS1,2 and 3 up link.Sir target among BS1 and the BS2 reaches by changing typically for this, because BS1 and BS2 have on down link the fast power control connection with MS.
Usually, the preferred embodiments of the present invention are removed any link under all very weak situation of down link and up link.Travelling carriage keeps in the communication set of its activation and such base station communication, in these base stations, strong up link, i.e. (or vice versa) will interrelate with weak down link in low path loss and low interference (making to use low-power to reach the factor of quality objective).At last, strong up link and down link signal will be guaranteed at travelling carriage and anyly have a communication continuity between the base station of the possible power reduction instruction that MS provides by RNC.
According to exemplary embodiment of the present invention, travelling carriage is for all adjacent cell report BCH power levels, no matter this signal be a little less than or strong.RNC uses the measurement result from travelling carriage, so that determine according to the downlink information of being reported when adjacent base station should measure the up-link information by the travelling carriage emission.When up-link information satisfies threshold value, will trigger switching.Be used to start that BS measures that other reason also can be: BS is subjected to the limit or the BS member in the activation group that high interference level infringement, MS power output be about to reach it will use up power.The frequency that Another reason: MS uses will reach overload, thereby MS must be switched to another frequency.Then, BS can measure MS, and estimates UE should use which BS (frequency of supposing other is not supported by sub-districts all in the zone) after frequency shift.When BS measured MS, MS was identified by the scrambled code of its uniqueness.As the result that BS measures, MS is identified by the scrambled code of its uniqueness.In addition, more switch decision between frequency reliably should be made by system.
Fig. 7 shows when travelling carriage moves through the geographic area of close BS1, BS2 and BS3 in time, the comparison of the signal quality that receives from each base station at the travelling carriage place.In the previous time, travelling carriage only carries out Speech Communication (and may monitor from BS2 and BS3 down link condition) with BS 1.BS2 and BS# are not included in the travelling carriage present base station activation group.In any case travelling carriage continues to RNC 100 reports about the situation for the downlink signal strength of adjacent sub-district BS2 and BS3.At time t1, reach for the signal strength signal intensity of BS2 down link can be included in current communication activation group) threshold value of CS.This can be looked at as for the request of upgrading.(in IS-95, request is more obviously, such as " MS sends its irrecusable proposal to network ").
Travelling carriage continues the downlink signal strength of test from base station BS 3.When surpassing adjacent cell set threshold value from the downlink signal strength of BS3) during NS, the travelling carriage report: BS3 can be included in current group candidate.For direct-cut operation, RNC notice BS3 goes estimating uplink condition and report about possible interference and power level condition.RNC returns a report to MS: can begin when and with great power level with being connected of BS3.As RNC notice MS: exist suitable handoff technique condition (with suitable power level) and MS to detect from BS3's) during CS down link threshold value, so BS3 is added in the current report.For soft handover, MS adjusts its power not obviously; When the power control bit that transmits on the down link of activation group is represented: when MS power should be reduced, it regulated its power.
Fig. 8 shows that another the invention provides the exemplary embodiment of favourable application therein.On Fig. 8, mobile station MS 1 at position A to begin to communicate by letter from up link on the TCH of three base station BSs 1, BS2 and BS3 and down link.Like this, MS has the current communication set that equals BS1, BS2 and BS3.Mobile station MS 1 monitors the BCH from BS4 and BS5, finally they is added in its adjacent sub-district of suggestion.Yet, exist BS4 and BS5 added to problem in the current report.For BS4, signal strength signal intensity is too big, thereby should be reduced as far as possible apace.If BS4 detects strong signal, then BS4 can indicate BS1,2,3 to reduce the target of their signal interference, thus, forces MS to reduce power fast by using the fast power control bit, so that it does not disturb BS4.If thereby the BS4 up link is included in the up-link power that reduces of compensation UE in the DHO combination, then it also is favourable.The BS4 down link can be activated, and can be updated after the MS activation group when network is thought fit.For BS5, the communication that MS has set up on channel TCH ρ between the communication of carrying out on the TCH will be to MS1 and BS5 causes unacceptable interference.
If mobile station MS 1 is the comparison of the downlink signal strength of basis between BS1, BS2, the relative BS4 of BS3 and BS5 only, thereby make the judgement of switching with being independent of network, then communication will be prevented from uplink side, because network MS power has flooded BS4 and disturbed existing communication among the BS5.On the other hand, according to the preferred embodiments of the present invention, when MS1 moved to position B, MS1 detected the BCH down link from BS4 ' and BS5 ', and worked as for each adjacent base station) when NS was exceeded, MS1 was to network-reporting.When reaching threshold value, handoff procedure is carried out in not immediate command of network, estimates but informing base station carries out up link.After doing like this, base station BS 4 or BS5 be detection power level issue or disturbed condition, and will report to network to condition.If BS4 and BS1,2,3 just move, switch then that should to be looked at as be that previous the power that carries out is controlled so that help that all other uses the MS of BS4 for this MS is restricted on same frequency.If MS power is reduced, then BS5 no longer is subjected to the obstruction of this MS.RNC wait for then from travelling carriage, for other the other downlink information input of adjacent sub-district.
Fig. 9 shows can advantageously use another example embodiment of the present invention.On Fig. 9, travelling carriage provides service by the network operator 1 on the left side on indicated border, in case move to position B, travelling carriage just provides service by the different network operator (network operator 2) on the right on border.And in network operator 1 sub-district 1, mobile station MS carries out uplink communication with frequency F1.If travelling carriage moves to network operator 2 sub-district, travelling carriage may carry out uplink communication with frequency F1, thereby with other transmission interference is arranged.After using the present invention, create those base stations that are used for network operator 1 (surpassing) CS threshold value by mobile station MS) current inventory, and be used for network operator 2 () NS threshold value by the BCH down link establishment that detects network operator 2 sub-districts) adjacent inventory.This information is reported to network operator 2 RNC, and the up link from mobile station MS is gone to measure in the base station 2 in its instruction sub-district 2.This uplink measurement can present the high signal strength signal intensity from this specific MS, so as long as MS is not connected to sub-district 2, sub-district 2 just is subjected to the infringement from the interference of this MS.The RNC that is used for network operator 2 is then to the RNC report that is used for network operator 1: adjacent inventory does not allow travelling carriage 2 to carry out uplink communication with frequency F1 in the sub-district.After receiving this information, have at least three options to do from network operator 2.
1. the inside network operator who carries out 2 (network operator 2) to the sub-district, 1 (network operator 1) from the sub-district is switched.
2. carry out internal frequency and switch, but still reside in network operator 1 place.
3. restriction power output.
If select the method according to 1, the RNC that then is used for network operator 1 will ask to carry out from the sub-district 12 the switching to the sub-district, and RNC network operator 2 BSs of order in sub-district 2 measure user subject, and answer questions back and forth in the request of switching according to measurement result.
Though the present invention is considered to most realistic describing with preferred embodiment in conjunction with current, but should see, the present invention is not limited to the embodiment that disclosed, on the contrary, the invention is intended to cover various modifications in the spirit and scope that are included in appended claims and the arrangement that is equal to.
Claims (7)
1. changing method that is used to have the network of a plurality of base stations, one of them mobile radio station and at least one base station communicate, and the method is characterized in that:
Receive the downlink measurement data of network from mobile radio station, and determine according to the downlink measurement data whether one or more base stations should measure the one or more characteristics from the ul transmissions of travelling carriage;
One or more characteristics of the radio up-line transmission of measurement from mobile radio station to one or more adjacent base stations;
The idle channel of estimating one or more base stations according to the down link of measuring and uplink feature is so that determine which idle channel is applicable to this mobile radio station;
According to up link and the downlink characteristics measured, give travelling carriage the power level reporting of handover event technical conditions and travelling carriage; And
Power level according to handover event technical conditions and travelling carriage is switched mobile radio station.
2. the process of claim 1 wherein that switching is soft handover.
3. the process of claim 1 wherein that switching is direct-cut operation.
4. the process of claim 1 wherein that switching is to switch between the network operator.
5. the process of claim 1 wherein that mobile radio station keeps and the communicating by letter of present base station after switching.
6. the process of claim 1 wherein that the downlink measurement of regulation is data based relates to the relation between the threshold value of the down link signal reference level between this mobile radio station and the base station and is reported to network measurement data and one.
7. the process of claim 1 wherein that in down link and the uplink measurement data at least one is at least one numerical value in the following:
-signal strength signal intensity,
-signal noise ratio,
-path loss,
-the time difference and
The time-delay of-round trip.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34412299A | 1999-06-24 | 1999-06-24 | |
| US09/344,122 | 1999-06-24 |
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| Publication Number | Publication Date |
|---|---|
| CN1371581A CN1371581A (en) | 2002-09-25 |
| CN1254144C true CN1254144C (en) | 2006-04-26 |
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| CNB008119732A Expired - Fee Related CN1254144C (en) | 1999-06-24 | 2000-05-23 | Network-evaluated handover assisted by both mobile and base-stations |
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| Country | Link |
|---|---|
| EP (1) | EP1192830A1 (en) |
| JP (1) | JP2003503922A (en) |
| CN (1) | CN1254144C (en) |
| AU (1) | AU5261500A (en) |
| TW (1) | TW573435B (en) |
| WO (1) | WO2001001720A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7206580B2 (en) * | 1999-11-04 | 2007-04-17 | Qualcomm Incorporated | Method and apparatus for performing handoff in a high speed communication system |
| CN100382650C (en) * | 2003-11-21 | 2008-04-16 | 株式会社日立国际电气 | Mobile communication system and method for hand-off |
| EP1757135A1 (en) * | 2004-06-15 | 2007-02-28 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Smooth hard handover method, mobile station and base station adapted for the method |
| KR100677459B1 (en) | 2005-06-10 | 2007-02-02 | 엘지전자 주식회사 | Method for processing a handover in a mobile communication system and system therefor |
| JP4837957B2 (en) | 2005-08-23 | 2011-12-14 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile station, base station, mobile communication system and communication method |
| JP4527641B2 (en) | 2005-08-24 | 2010-08-18 | 株式会社エヌ・ティ・ティ・ドコモ | Transmission rate control method and radio network controller |
| US8891489B2 (en) | 2007-03-19 | 2014-11-18 | Qualcomm Incorporated | Handover mechanism that exploits uplink channel quality of a target cell |
| US8509776B2 (en) | 2007-12-19 | 2013-08-13 | Motorola Mobility Llc | Network initiated proactive handover procedure for fast moving wireless devices |
| EP2120360A1 (en) * | 2008-05-13 | 2009-11-18 | Vodafone Group PLC | Method and system of quality enhancement in GSM |
| US9674792B2 (en) | 2009-08-12 | 2017-06-06 | Blackberry Limited | System and method for modulation and coding scheme adaptation and power control in a relay network |
| CA2770699C (en) | 2009-08-12 | 2020-07-21 | Research In Motion Limited | System and method for association and uplink adaptation in a relay network |
| US9246655B2 (en) | 2009-12-17 | 2016-01-26 | Telefonaktiebolaget L M Ericsson (Publ) | Maintaining packet switched session in LTE when establishing GSM circuit switched call |
| EP2805544A4 (en) * | 2012-01-20 | 2015-11-25 | Nokia Solutions & Networks Oy | Cell handovers |
| US9253702B2 (en) | 2012-09-06 | 2016-02-02 | Telefonaktiebolaget L M Ericsson (Publ) | Handover in heterogeneous radio communication networks based on systematic imbalance differences |
| US8867397B2 (en) | 2012-10-17 | 2014-10-21 | Motorola Solutions, Inc. | Method and apparatus for uplink power control in an orthogonal frequency division multiple access communication system |
| US9674755B2 (en) * | 2014-01-15 | 2017-06-06 | Qualcomm Incorporated | Intra and inter-frequency handover in LTE with uplink and downlink metrics |
| CN108464040B (en) * | 2014-06-19 | 2020-09-15 | 三菱电机株式会社 | Base station, control station, and handover method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9200915D0 (en) * | 1992-03-24 | 1992-03-24 | Ericsson Telefon Ab L M | METHODS IN A CELLULAR MOBILE RADIO COMMUNINCATION SYSTEM |
| US5697055A (en) * | 1994-10-16 | 1997-12-09 | Qualcomm Incorporated | Method and apparatus for handoff between different cellular communications systems |
| US5634192A (en) * | 1995-02-23 | 1997-05-27 | Northern Telecom Limited | Mobile-assisted handoff technique |
-
2000
- 2000-05-23 EP EP00937442A patent/EP1192830A1/en not_active Withdrawn
- 2000-05-23 WO PCT/SE2000/001039 patent/WO2001001720A1/en not_active Application Discontinuation
- 2000-05-23 CN CNB008119732A patent/CN1254144C/en not_active Expired - Fee Related
- 2000-05-23 AU AU52615/00A patent/AU5261500A/en not_active Abandoned
- 2000-05-23 JP JP2001506262A patent/JP2003503922A/en active Pending
- 2000-06-02 TW TW89110813A patent/TW573435B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| TW573435B (en) | 2004-01-21 |
| EP1192830A1 (en) | 2002-04-03 |
| AU5261500A (en) | 2001-01-31 |
| WO2001001720A1 (en) | 2001-01-04 |
| CN1371581A (en) | 2002-09-25 |
| JP2003503922A (en) | 2003-01-28 |
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