CN101379855B - Method and system for switching from a source district to a target district in honeycomb communication system - Google Patents
Method and system for switching from a source district to a target district in honeycomb communication system Download PDFInfo
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
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- H—ELECTRICITY
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- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
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Abstract
The present invention relates to a method for transmitting switch command in the switch process of a honeycomb communication system. The communication system comprises a plurality of cells, and each cell comprises at least one wireless transmitter for providing the communication with at least one user facility in the cell coverage area, wherein, the communication with the user facility is switched from source cell to target cell in the switching process, and furthermore the switch command is transmitted from the communication system to the user facility before the switch. The method comprises a procedure for transmitting the switch command by at least one wireless transmitter in another cell except for the source cell. The invention also relates to a communication system.
Description
Technical field
The present invention relates in cellular communication system to switch to the method for Target cell from the cell-of-origin; The invention further relates to and comprise a plurality of sub-districts; Each sub-district comprises the transmitting set that at least one is used for providing the subscriber equipment with said cell coverage area to communicate; Handoff procedure will be for switching to Target cell with the communication of the subscriber equipment of communicating by letter from the cell-of-origin; And send the communication system of switching command before the said switching, according to the computer program of the said method that in cellular communication system, switches to Target cell with according to the computer program of said computer program from the cell-of-origin to said subscriber equipment.
Background technology
Mobile radio system is normally cellular; The whole overlay area that is system is divided into little zone; Wherein each little zone is associated with the wireless base station with one or more antennas (transmitting set), and the wireless base station provides the communication resource through the wave point that is used for communicating by letter with the subscriber equipment (UE) of overlay area, wireless base station.These zones are commonly referred to the sub-district, and UE can be mobile phone, smart phone or equipment such as handheld computer with communication capacity.
The base station that has single transmitting set often refers to the omni cell website that has only a sub-district.But the base station can be shared by two or more sub-districts, and for example, the base station can be installed towards two above transmitting sets of different directions emission, and the overlay area of each transmitter is defined as a sub-district.This situation is commonly referred to fan-shaped website, and each sector constitutes a sub-district.General example is that three sub-districts are supported in a fan-shaped base station.Similarly, single subdistrict can utilize two or more transmitting sets that wireless coverage is provided in the specific region.
In the simple form of cellular communications networks, the sub-district is adjacent one another are, so that the covering on the geographic area that communication needs to be provided jointly.But, in more complicated network, there is different cell layer, wherein can overlap at least in the sub-district in the different layers, and the size of sub-district is also different.
Cellular network can provide the mobility support.That is to say that when UE moved, cellular network allowed the interface (be UE with transmitting set be connected) between UE and the network between different transmitting sets, to switch thereupon, thereby makes UE can keep ongoing communication in system.The interface quality that transfer from a transmitting set to another transmitting set (being this specification and the switching described in the claim) usually occurs in current service cell (being called the cell-of-origin hereinafter) drops to when being lower than threshold value.Simultaneously, in planning good wireless communication system, the interface quality of another sub-district (or a plurality of sub-district) will rise, so UE can select in other sub-district one as Target cell, promptly keep the sub-district, source (service) of communication as new being used to.
Switching has a large amount of different types, is divided into direct-cut operation and soft/More Soft Handoff.
Direct-cut operation is often referred to UE and before being connected to Target cell, leaves the cell-of-origin.It also is called " break-before-make formula " and switches.Such switching can be used in the GSM network; Can be used as option and be used in 3G UTRAN network; Also be intended for use in the definition of current third generation partner program (3GPP) to following cellular communication system, the universal terrestrial radio that promptly is called evolution at present inserts (E-UTRA) or Long Term Evolution (LTE).
If when UE is connected to Target cell, UE keeps being connected with the cell-of-origin, is also referred to as " make-before-break formula ", and then switching is soft handover.Correspondingly, in such switching, UE is connected to two (or more) sub-districts simultaneously in certain period.When the sub-district that UE is connected to belongs to identical base station, switch and be called More Soft Handoff.
Usually, move to owing to UE when the connection of confirming the cell-of-origin outside the overlay area of cell-of-origin and be worse off, and when confirming better sub-district, just trigger switching.But, except confirming to be worse off being connected between UE and the cell-of-origin, must before making the decision of switching, confirm candidate target cells.Further,, often need to consider in special time period, to measure, subtract and trigger switching so that guarantee can not gather because of unexpected covering by base station and UE for source cell base station.
Therefore; If it is oversize to confirm need to switch and confirm the time that suitable Target cell need spend; So, current connection may deteriorate into the degree that UE does not correctly receive switching command, and wherein this switching command comprises the details of the relevant communication resource that will in Target cell, use and/or the Target cell identity of sending from the cell-of-origin; And for the switching by network control, UE must receive switching command so that know the sub-district and/or the communication resource that will switch to.
For this reason, the method that multiple increase correctly receives the possibility of switching command has been proposed.For example, in GSM, when sending switching command, the cell-of-origin can increase power so that increase the possibility that UE correctly receives message.In another example, can repeat switching command and without wait acknowledge.
But, even utilize above solution, still have such risk, thereby promptly current communication channel deteriorates into the degree that UE can not receive the ongoing communication disruption of switching command.
Therefore, need a kind of being used for to switch to improving one's methods of Target cell, so that improve the possibility of successful switch from the cell-of-origin.
Summary of the invention
The object of the present invention is to provide a kind of in cellular communication system solution to the problems described above.
Further purpose of the present invention is to provide a kind of communication system that addresses the above problem.
The invention provides a kind of method of in handoff procedure, passing on switching command of cellular communication system; Said communication system comprises a plurality of sub-districts, and each sub-district comprises at least one transmitting set, is used in cell coverage area, providing with at least one subscriber equipment communicating; Wherein, In said handoff procedure, switch to Target cell with the communication of the subscriber equipment of communicating by letter from the cell-of-origin, and said switching command sent to said subscriber equipment from said communication system before switching.This method also comprises:
At least one first transmitting set from first sub-district and at least one second transmitting set in second sub-district send said switching command, and said second sub-district is different sub-districts with said first sub-district;
Wherein, said first transmitting set and said second transmitting set adopt identical encoding scheme and in a synchronous manner and through identical physical resource, said switching command are issued said subscriber equipment;
Said subscriber equipment merges the said switching command on same channel from different districts.
The advantage of method provided by the invention is, this method and prior art antithesis, switching command is to think that from UE its channel quality sends than better sub-district, cell-of-origin, therefore improved the possibility that UE correctly receives switching command greatly.In the present invention the most simply used, switching command only sent from the sub-district of non-cell-of-origin, as more sending the sub-district of high quality communication from Target cell or other any can providing than the cell-of-origin.Owing to move to outside the coverage of cell-of-origin at UE usually, when the connection of cell-of-origin worsens, just can trigger switching, therefore always have the sub-district that is more suitable for sending switching command than the cell-of-origin, such as the sub-district that better signal strength signal intensity can be provided for UE.Switching command can comprise the identity of the Target cell that communication will switch to, and/or the communication resource information of communicating by letter with Target cell etc.
In another embodiment of the present invention, switching command can send from a plurality of sub-districts, like two, three or more sub-districts.For example, this information can be from cell-of-origin and Target cell, or Target cell and another neighbor cell, or neither the cell-of-origin or also the sub-district of non-Target cell send.Be described below, a plurality of sub-districts can be by front and back order or parallel through identical physical communication resources transmission switching command.
Below in conjunction with preferred embodiment and accompanying drawing, characteristic of the present invention and advantage are done further explain; It should be noted that below narration only is used for way of illustration explanation the present invention, but not is used to limit scope of the present invention.
Description of drawings
Fig. 1 has shown the instance that makes things convenient for the E-UTRA system that the present invention uses.
Fig. 2 has shown the embodiment of switching flow in the prior art.
Fig. 3 has shown an embodiment of switching flow of the present invention.
Fig. 4 has shown another embodiment of switching flow of the present invention.
Fig. 5 has shown another embodiment of switching flow of the present invention.
Embodiment
To promptly be called evolved universal terrestrial radio at present and insert (E-UTRA) or Long Term Evolution plan, for example is described the present invention with of the definition of third generation partner program (3GPP) task now following cellular communication system.
The example architecture that has shown E-UTRA system 100 among Fig. 1 comprises two kinds of nodes: and the wireless base station (the static radio receiving-transmitting unit that is used for duplex communication, or according to circumstances, only be used for the transmitting set of downlink mode communication.In Fig. 1, for the base station provides radio receiving-transmitting unit), in E-UTRA, be called the eNB 101-103 of enhanced base station and aGW (IAD) 104-105.Wherein eNB 101-103 belongs to the UTRAN (E-UTRAN) 106 of evolution, and aGW belongs to the block core (EPC) 107 of evolution.User equipment (UE) 108 relies on wave point, and promptly the Uu interface 109, are connected to network (E-UTRAN and EPC).ENB 101-103 handles the communication in the particular coverage (being the sub-district) through wave point.This particular coverage is such zone, and its wireless signal carries out gratifying communicate by letter with UE to enough permissions by force in this zone.
When UE 108 moves in the overlay area that communication system provides; UE 108 can move to another sub-district from a sub-district; Thereby with the eNB that ongoing communication belongs to from UE at present, i.e. (switching) shifted to sub-district that UE is getting in cell-of-origin (sub-district 103 among Fig. 1); Be Target cell, (like the sub-district among Fig. 1 102).Through on the Uu of Target cell interface, setting up communication channel, and the communication channel that terminates on the Uu interface of cell-of-origin is accomplished this switching.
Normally wherein any or two measurements of carrying out come the select target sub-district according to UE and network (base station).Switching from a base station to the communication of another base station can be by network control, or by UE control, or by its Combination Control.Under the situation that UE control is switched; Target cell is just known after being got in touch by UE and will be switched; When UE contact target cell base station, the base station communication of this base station and Controlling Source sub-district is so that the request source cell base station is transmitted needed information about UE.This information is used to set up and being connected of UE, and continues ongoing communication.The switching of UE control is sometimes referred to as to transmit switches.
When switching is during by network control, UE can provide information to make handover decisions with auxiliary network to network, for example through sending neighbor cell measurements.This is called Mobile Assisted Handover (MAHO), UE to around the base station on measure, and measurement result is sent to eNB, be used for system handles.In order to reduce signaling, UE only measures the potential target sub-district usually." potential " Target cell defines in the neighbor cell lists of UE.This neighbor cell lists is sent on the UE in the eNB scope through wireless channel.
As the replacement scheme that network sends neighbor cell lists, neighbor cell lists information can be activating and/or idle pattern is confirmed in UE, and need each sub-district from system send a large amount of around or the tabulation of neighbor cell.Disclose the example of this system among the 3GPP document R2-070493 " Neighbour cell list reduction ", the document has been described a kind of UE impliedly generates neighbor cell lists based on the information of sending in each sub-district method.
Typical handoff procedure has been shown among Fig. 2, for example, the typical handoff procedure when UE 108 leaves the overlay area of eNB 103 and get into the overlay area of the eNB 102 among Fig. 1.Shown in arrow 211, before switching, sent to eNB 103 from aGW 105 before this for the data of UE, and further send to UE 108.As stated, UE measures the signal strength signal intensity of peripheral base station continuously.Peripheral base station can show in the neighbor cell lists that is sent by base station in service sector.In disclosed example, this tabulation can comprise eNB 101 and eNB 102 and service eNB103.And measurement report can comprise signal strength signal intensity and/or other channel quality parameter of base station 101 and 102 successively, and by UE continuously or as required (shown in arrow 210) send to eNB, arrow 212.
Then, eNB 103 makes handover decisions based on own with UE measurement result (decision block 213 among Fig. 2).In this example, confirm that eNB 102 is suitable as new Target cell.
After decision-making; ENB 103 sends the eNB of handoff request message to candidate target cells, and promptly eNB 102, arrow 214; And in decision block 215; Target cell eNB was used in the resource of switching in 102 minutes, utilized the switching request acknowledgement message that comprises the information of describing this resource to respond eNB103, arrow 216.When service eNB received switching request acknowledgement message 216, in order successfully to set up and being connected of Target cell, the switching command that will comprise the UE information needed sent to UE 108 from eNB 103, arrow 217.The UE information needed can comprise the related communication resource information (like the resource of being distributed of step 215) of the Target cell communication resource of identity and/or the use of Target cell.
UE 108 becomes newly assigned Radio Resource with the communication resource, and the radio contact of foundation and Target cell eNB102, arrow 218.ENB 102 communicates by letter with aGW 105, so as this switching of notice aGW, arrow 219, aGW carries out essential Channel Exchange, and 230, so that data flow is transferred to eNB 102 from eNB 103, aGW makes and confirms response, arrow 220 simultaneously.After aGW accepted confirmation, eNB 102 notified current preceding source (service) eNB 103 can discharge its resource to be used for other application, and user data is sent to UE by eNB 102, arrow 221.As shown in Figure 1; If eNB belongs to different aGW, for example, if above communication is switched to eNB101 rather than switches eNB 102; ENB possibly send the completion information of switching to aGW 104 rather than aGW 105; And in this case, possibly need some other passage hand off signaling 230 will communicate by letter from aGW 105 " switching " to aGW 104, to be used for arriving further the transmission of eNB 101.
But the solution of describing among Fig. 2 has some shortcomings.As stated, when the measurement result on the channel of ongoing communication and/or the measurement result indication that receives from UE move to the overlay area of eNB owing to UE outside, cause current and UE be connected deterioration the time, eNB starts above-mentioned switching usually.
If it is worsen slowly, for example, especially true under rural environment; Sight line is more or less arranged between the antenna system of UE and sub-district, and decline gradually is usually slowly to not only enough guaranteeing in fact to find deterioration, and can it be classified as owing to UE moves to the deterioration that causes outside the overlay area; Rather than classify as the local rapid decline (for example, urban environment can receive Rayleigh fading usually, is characterized in the unsettled zonule that exists the quality of reception very poor) that covers; Also guarantee to find candidate target cells; And find candidate target cells before the degree that loses communication in communication degradation, and make and switch decision, convey to UE safely.
But, in intensive urban environment,, worsen and carry out very soon usually because the wireless wave that connects possibly receive the obstruction of other object in building or the urban environment suddenly.In this case; Depend on such fact owing to accomplish the time that handoff procedure spent; Be that eNB need consider the measurement that base station and UE carry out so that guarantee can not trigger switching because of the rapid decline that covers in special time period, therefore worsening maybe be so fast so that before handoff procedure is not accomplished, just lose communication.In addition, UE possibly become up to the current area connection and can measure candidate target cells when being on duty mutually.This situation takes place as UE (so-called turning effect) when move in the corner of urban district building usually.
Therefore; If confirm that the time that needs switching and definite suitable Target cell to be spent is oversize; UE can not correctly receive the degree of this order when current connection possibly deteriorate into the transmission switching command; And for the switching of network control, the conversation that possibly cause for fear of communication disruption is interrupted and sends to the loss of data of UE, and UE is necessary to receive switching command so that know to switch to which sub-district.
As stated, correctly receive the possibility of message so that increase UE, or repeat to switch and, still have the substantive risk of these information drop-outs that send to UE without wait acknowledge even source eNB can increase power when sending switching command.
The present invention has overcome these defectives through handoff procedure, has described the exemplary embodiment of this handoff procedure among Fig. 3.Among the present invention, use sub-district rather than sub-district, source (service) to send switching command message.In the example in Fig. 3, cell-of-origin and Target cell all are used to send switching command message.Handoff procedure shown in Fig. 3 is similar to the handoff procedure of Fig. 2 aspect a lot.For example, the step 310-313 among Fig. 3 is similar to the step 210-213 among Fig. 2, therefore is not described in detail.
In this exemplary embodiment, adjacent base station can be that identical wireless channel sends through identical physical resource.This situation is especially true for E-UTAN.For example; Transmission in E-UTRAN can be set in single subdistrict or in one group of sub-district, send; Wherein transmission can be synchronous in the following manner, and promptly under the situation of not extra increase receiver complexity, UE merges a plurality of transmission signals on same channel from different districts.As long as the physical radio resource of utilizing identical encoding scheme to pass through " identical " simultaneously from different sub-districts is sent same information, above-mentioned Merge Scenarios is possible.On the basis of aforementioned delivery plan, UE need not know that the information that is received is that send more than one base station, rather than the source base station transmission.Specifically, in the OFDMA that E-UTRAN uses, physical radio resource is by a class frequency and time slot definition, and therefore, above-mentioned a plurality of frequencies that are transmitted in go up necessary consistent with the time.
Specifically get back to Fig. 3, when handover decisions is made in the cell-of-origin, 313; It will send information to Target cell; This message not only comprises handoff request, and comprises the channel that Target cell uses when sending switching command message, the channel that it uses when sending switching command corresponding to the cell-of-origin.This information can be included in the needed message of existing switching (Handover Required Message), perhaps sends as separate message.Like this,,, simply, show as independent transmission, propagate and be actually multipath (dividing collection) for UE as long as carry out simultaneously from the transmission of cell-of-origin and Target cell.Therefore, as long as synchronous with certain mode from the transmission of cell-of-origin and Target cell, so that UE can merge this different transmission signals, therefore, two transmission of being indicated by arrow 317a and 317b respectively are concerning UE, with showing as single transmission.Can improve the possibility of correct reception greatly like this; Even this be because and the cell-of-origin between communication link worsen fully; The quality of signals of sending from Target cell have very large maybe be with the correct reception that enough guarantees handover information, subsequently, program will be proceeded as Fig. 2 is said.About when sending the timing information of switching command message, when the cell-of-origin can send switching command in the indicating target sub-district, and perhaps Target cell can indicate the cell-of-origin when to send switching command.This information can adopt separate message to send, and perhaps preferably, is included in handoff request and the switching request acknowledgement message.
In a word; As long as the switching command message from the source and target sub-district is identical; Wireless channel through identical correctly sends; And (i.e. reception " multipath " (equalizer) receiver window of UE in) quite closely synchronously, then UE will benefit from from Target cell normally, stronger signal, and the benefit brought of multi-path combined gain.
In current cellular system, do not carry out usually this synchronous closely, but in such as the future cellular system of E-UTRAN, will become more general.
In GSM, cell-of-origin and UE can know the channel that sends switching message in advance.But in other system, must be referred to as down link (DL) and distribute sending switching command message allocated channel before such as E-UTRAN.DL distributes message and other and the relevant message of switching message of (DL Allocation) and so on, can send with the mode identical with aforementioned switching command message,, sends the DL assignment information simultaneously by cell-of-origin and Target cell respectively that is.
The further advantage of the embodiment of the invention is: it influences seldom UE or does not have, because UE need not take any specific action, just receives from the cell-of-origin as switching command message.
More than, cell-of-origin and Target cell send switching command message simultaneously.As stated, this exemplary embodiment needs two sub-district close synchronization.Though this is easy in supporting the Single Frequency Network network operating, realize, such as, in the E-UTRAN system,, the problem of above-mentioned communication disruption exists in the communication system with not too strict synchronization among base stations equally.
The exemplary solution that is used for this system is disclosed among Fig. 4.When making handover decisions, very possible Target cell possesses than the better radio condition of communicating by letter with UE in cell-of-origin.Therefore, preferably,, send switching command message by Target cell if let UE only need know the cell-of-origin channel, then more favourable.For example, can on physical channel, send this switching command by Target cell, said physics letter is used to send switching command by the cell-of-origin in other cases.Therefore, from UE, seem that the cell-of-origin has sent out switching command.As shown in Figure 4, disclosed and only sent the handoff procedure same the switching command message with Fig. 3 by Target cell except step 517.Therefore, being similar to the solution among Fig. 3, communicates by letter between Target cell indication is used for cell-of-origin and UE and will be used to send the control channel of switching controls message, 514 in the cell-of-origin.With above-mentioned similar, this information can be included in the required message of existing switching, or sends 514 as separate message.Therefore, because Target cell image source sub-district that kind has been sent switching command message 517 exactly, so Target cell has played the effect of cell-of-origin.Though require synchronously so not strictly, still require the level of synchronization of Target cell and cell-of-origin can guarantee that switching command message sends in any time slot window of UE is distributed in the cell-of-origin.The advantage of the solution of describing among Fig. 4 also is because UE need not take any specific action, so to not influence of UE, receive from the cell-of-origin like switching command message.
Another embodiment of the present invention has been shown among Fig. 5.In this embodiment, step 610-613 is corresponding to the step 210-213 among Fig. 3.But in step 614, the information that sends to Target cell further comprises an instruction, is used at the appointed time after the cycle, if find that UE fails to receive switching command message from the cell-of-origin, then switching command message is sent in the notification target sub-district.There is multiple mode can find that switching command fails.For example, Target cell is waited for switch acknowledgment message, in cycle at the appointed time (timer control) just can trigger Target cell transmission switching command message when not receiving message.In another exemplary embodiment, switching command message is sent ACK message through UE to the cell-of-origin and is confirmed.If do not receive this ACK message,, just trigger Target cell and send switching command message if perhaps receive negative ACK (NACK) message.In the latter case, trigger messages can be sent to Target cell in the cell-of-origin.
Further, the cell-of-origin can be set to the out of Memory of Target cell in forwarding step 614, also send the stand-by period (timer value).Can select fixing or preset timer value through the operation and maintenance process.
As the alternative of after timer expiration, only being sent switching command by Target cell, cell-of-origin and Target cell can be set to send switching command, such as, through the method for synchronization based on Fig. 3.
Further exemplary embodiment of the present invention is to utilize the appointment dedicated channel with better coverage to send switching command message.For example, this channel can be exclusively used in and only comprise switch data, is used for this cell-of-origin or is used for the sub-district of one group of shared this dedicated channel, in this case, can utilize the UE assigned address to send to particular UE.Can whenever be connected with the cell-of-origin, notify the details of this channel to UE.In one embodiment, if utilize conventional channel to send this switching command message failure, network begins on this dedicated channel, to send similar message.For example, when UE lost with being connected of cell-of-origin, UE can be set to begin to listen to this channel.Similarly, can be set to send switching command through dedicated channel always.
Dedicated channel can be used for only sending or sending from cell-of-origin and Target cell from Target cell, or sends from the one or more sub-districts that are different from this cell-of-origin and/or this Target cell.For example, when switching,, have a plurality of sub-districts and have better channel quality than current service cell in the UE position.In this case; Can from the UE measurement data that sends to network, find such sub-district; So this sub-district can be set on dedicated channel, send switching command, perhaps in another embodiment, on the channel of cell-of-origin use, send switching command.
Utilize the advantage of dedicated channel to be, can adjust, make on the cell boarder between cell-of-origin and the Target cell, to have normal control channel more performance than the cell-of-origin to dedicated channel.This can be through sending realization from cell-of-origin and Target cell, such as sending with the Single Frequency Network pattern simultaneously.
Whenever during connecting, can give UE with this channel notification, and if UE loses and being connected of cell-of-origin, UE can listen to this channel for switching command message.If network measuring is lost to UE, then begin on dedicated channel, to send switching command message.After timer expiration, if UE does not still receive any switching command message, it can proceed available call re-establishment process.
In yet another embodiment, the cell setting in this communication system can draw the position of this sub-district in the cell pattern for sending identity data from this identity data, and wherein, this cell pattern has been described sub-district relative position to each other.In this embodiment, switching command can be set to comprise the expression of the Target cell position in this cell pattern.Sub-district in this pattern can be distinguished by the logic district value (LCV) of the subdistrict position in this pattern of expression, and wherein this switching command at least partly is made up of the logic district value representation of expression Target cell.For example, among the 3GPP document R2-070493 " Neighbour celllist reduction " such cell pattern system is disclosed in more detail.
In a word, the common ground of all embodiment of the present invention is that UE correctly receives the possibility increase of switching command, and at least for some embodiment, the present invention has very little perhaps not influence to UE, promptly needn't extra characteristic be provided to UE.
Though the present invention that combined the E-UTRAN system description, principle of the present invention can be applicable to common honeycomb connecting system, and can be used for any cellular system, but is not limited to CDMA2000, UTMS&GSM.Especially,, perhaps send successively in the exemplary embodiment of switching command, as long as these sub-districts can be sent switching command and just can be suitable on the channel that UE can decode by two or more sub-districts only by Target cell.Further, two or more cell synchronizing exemplary embodiment of sending switching commands goes for all at least and can carry out in the system of this synchronous transmission.
Claims (41)
1. the method for in handoff procedure, passing on switching command of a cellular communication system; Said communication system comprises a plurality of sub-districts; Each sub-district comprises that at least one is used for the transmitting set that the subscriber equipment with said cell coverage area communicates; Said handoff procedure will be for switching to Target cell with the communication of the subscriber equipment of communicating by letter from the cell-of-origin, wherein, said switching command sent to said subscriber equipment by said communication system before said switching; It is characterized in that, said method comprising the steps of:
At least one first transmitting set from first sub-district and at least one second transmitting set in second sub-district send said switching command, and said second sub-district is different sub-districts with said first sub-district;
Wherein, said first transmitting set and said second transmitting set adopt identical encoding scheme and in a synchronous manner and through identical physical resource, said switching command are issued said subscriber equipment;
Said subscriber equipment merges the said switching command on same channel from different districts.
2. method according to claim 1 is characterized in that, said first transmitting set is the Target cell transmitting set.
3. method according to claim 2 is characterized in that, said second transmitting set is the cell-of-origin transmitting set.
4. method according to claim 1 is characterized in that, said second transmitting set is the transmitting set of another sub-district outside the said cell-of-origin.
5. method according to claim 1 is characterized in that, when said subscriber equipment when the overlay area of said cell-of-origin moves to the overlay area of said Target cell, carry out the step of said transmission switching command.
6. method according to claim 1 is characterized in that, said switching command comprises when setting up with being connected of said Target cell the information of needs in the said subscriber equipment.
7. method according to claim 1; It is characterized in that; Further comprise: at least one the 3rd transmitting set in the 3rd sub-district; Adopt said same-code scheme and, send said switching command to said subscriber equipment with said synchronous mode and through said identical physical resource.
8. method according to claim 1 is characterized in that, sends said switching command through the physical channel that is used for said cell-of-origin and said communications of user equipment.
9. method according to claim 1 is characterized in that, is used to pass on the DPCH resource of handover information to send said switching command through at least one.
10. method according to claim 9 is characterized in that, the said at least one DPCH resource of the common use of a plurality of base stations and/or subscriber equipment.
11. method according to claim 1 is characterized in that, sends said switching command through the physical channel resources of being made up of one or more frequencies and one or more Transmission Time Interval.
12. method according to claim 1 is characterized in that, before sending said switching command, said method further comprises the steps: to confirm the said Target cell of the said switching in the said communication system.
13. method according to claim 12 is characterized in that, the transmitting set of said cell-of-origin is carried out said definite step.
14. method according to claim 1; It is characterized in that; In said communication system, identity data is sent in each said sub-district, and said identity data is used for drawing the positional information in the said sub-district of cell pattern; Said cell pattern is represented said sub-district relative position to each other, and said switching command comprises that the position of Target cell described in the said cell pattern representes.
15. method according to claim 14; It is characterized in that; Said sub-district in the said cell pattern is to be distinguished by the logic district value LCV that representes the subdistrict position in the said pattern, and said switching command at least partly is made up of the expression of the logic district value of representing said Target cell.
16. method according to claim 3; It is characterized in that; If said subscriber equipment does not receive the switching command that sends from said cell-of-origin, then carry out the step that said at least one first transmitting set and at least one second transmitting set in second sub-district from first sub-district sends said switching command.
17. method according to claim 1 is characterized in that, further comprises step: utilize said transmitting set to send down link DL assignment messages to said subscriber equipment.
18. method according to claim 1 is characterized in that, said transmitting set is a radio receiving-transmitting unit.
19. method according to claim 1 is characterized in that, said transmitting set is the wireless base station.
20. method according to claim 19 is characterized in that, said wireless base station is that evolved universal terrestrial radio inserts the enhanced base station eNB in the E-UTRA system.
21. cellular communication system; Said communication system comprises a plurality of sub-districts, and each sub-district comprises the transmitting set that at least one is used for providing the subscriber equipment with said cell coverage area to communicate, wherein; The handoff procedure of said communication system will be for switching to Target cell with the communication of the subscriber equipment of communicating by letter from the cell-of-origin; And said communication system was sent switching command to said subscriber equipment before said switching, it is characterized in that said system comprises:
Be used for the device that sends said switching command from least one first transmitting set and at least one second transmitting set second sub-district of first sub-district, wherein, said second sub-district is different sub-districts with said first sub-district;
Wherein, said first transmitting set and said second transmitting set adopt identical encoding scheme and in a synchronous manner and through identical physical resource, said switching command are issued said subscriber equipment;
Said subscriber equipment merges the said switching command on same channel from different districts.
22. system according to claim 21 is characterized in that, said first transmitting set is the transmitting set of Target cell.
23. system according to claim 21 is characterized in that, said second transmitting set is the cell-of-origin transmitting set.
24. system according to claim 21 is characterized in that, said second transmitting set is the transmitting set in another sub-district outside the said cell-of-origin.
25. system according to claim 21 is characterized in that, said system comprises: be used at said subscriber equipment carrying out said device for switching when the overlay area of said cell-of-origin moves to the overlay area of said Target cell.
26. system according to claim 21 is characterized in that, said switching command comprises: when setting up with being connected of said Target cell, and the information of needs in the said subscriber equipment.
27. system according to claim 26 is characterized in that, said switching command comprises: the Target cell identity and/or the communication resource that in Target cell, uses are represented.
28. system according to claim 21 is characterized in that, said system further comprises: the device that is used for sending to said subscriber equipment from least one the 3rd transmitting set of the 3rd sub-district said switching command.
29. system according to claim 21 is characterized in that, one or more transmitting sets send said switching command through the physical channel that is used for said cell-of-origin and said communications of user equipment.
30. system according to claim 21 is characterized in that, said first transmitting set and said second transmitting set are used for being used to pass on the DPCH resource of handover information to send said switching command through at least one.
31. system according to claim 30 is characterized in that, the said at least one DPCH resource of the common use of a plurality of base stations and/or subscriber equipment.
32. system according to claim 21 is characterized in that, sends said switching command through a physical channel resources with a upper frequency and an above Transmission Time Interval composition.
33. system according to claim 21 is characterized in that, said system further comprises: be used for before sending said switching command, confirming the device of the Target cell of the said switching in the said communication system.
34. system according to claim 33 is characterized in that, the transmitting set of said cell-of-origin is carried out said definite step.
35. system according to claim 21; It is characterized in that; Identity data is sent in the said sub-district of in said communication system each; Said identity data is used for drawing the positional information in the said sub-district of cell pattern, and said cell pattern has been represented the relative position of each sub-district, and said switching command comprises that the position of Target cell described in the said cell pattern representes.
36. system according to claim 35; It is characterized in that; Sub-district in the said cell pattern is distinguished by the logic district value LCV of subdistrict position in the said cell pattern of expression, and said switching command at least partly comprises the expression of the logic district value of said Target cell.
37. system according to claim 21 is characterized in that, if said subscriber equipment does not receive the switching command that sends from said cell-of-origin, then sends said switching command from said first transmitting set.
38. system according to claim 21 is characterized in that, said system further comprises: the device that sends down link DL assignment messages with said transmitting set to said subscriber equipment.
39. system according to claim 21 is characterized in that, said transmitting set is a radio receiving-transmitting unit.
40. system according to claim 21 is characterized in that, said transmitting set is the wireless base station.
41., it is characterized in that said wireless base station is the enhanced base station eNB in the evolved UTRA system according to the described method of claim 40.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2007/001428 WO2008131589A1 (en) | 2007-04-28 | 2007-04-28 | Method and system for handover from a source cell to a target cell in a cellular communication system |
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| CN101379855A CN101379855A (en) | 2009-03-04 |
| CN101379855B true CN101379855B (en) | 2012-06-27 |
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| CN2007800007776A Active CN101379855B (en) | 2007-04-28 | 2007-04-28 | Method and system for switching from a source district to a target district in honeycomb communication system |
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| WO (1) | WO2008131589A1 (en) |
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| KR101136135B1 (en) * | 2008-11-21 | 2012-04-17 | 한국전자통신연구원 | Handover apparatus between a base station with another in carrier aggregation environment |
| CN101959264A (en) * | 2009-07-17 | 2011-01-26 | 中兴通讯股份有限公司 | Logic cell switching method and system |
| US9516559B2 (en) * | 2010-01-20 | 2016-12-06 | Blackberry Limited | Methods of performing cell change without receiving description of resources in a target cell |
| GB2479534B (en) * | 2010-04-12 | 2014-11-12 | Samsung Electronics Co Ltd | Handover with carrier aggregation |
| KR101699023B1 (en) * | 2010-07-14 | 2017-01-23 | 주식회사 팬택 | Apparatus and method of performing handover in multiple component carrier system |
| US8467351B2 (en) * | 2010-11-05 | 2013-06-18 | Interdigital Patent Holdings, Inc. | Relay node interface related layer 2 measurements and relay node handling in network load balancing |
| EP2679052B1 (en) | 2011-02-18 | 2016-10-26 | BlackBerry Limited | Cell change notification control for csg cells |
| CN103841612B (en) | 2012-11-22 | 2017-12-01 | 华为技术有限公司 | Mobile terminal switches the method and device of base station |
| JP6163007B2 (en) * | 2013-05-09 | 2017-07-12 | 株式会社Ｎｔｔドコモ | HANDOVER METHOD AND RADIO BASE STATION |
| WO2014198026A1 (en) * | 2013-06-13 | 2014-12-18 | 华为技术有限公司 | Method and apparatus for sending cell handover command |
| CN104094625B (en) * | 2014-01-02 | 2018-02-02 | 华为技术有限公司 | Wireless signal handles the dynamic programming method and device of cluster |
| TW201836390A (en) * | 2017-03-22 | 2018-10-01 | 日商索尼股份有限公司 | Wireless telecommunications apparatus and methods |
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| FI103855B1 (en) * | 1996-10-30 | 1999-09-30 | Nokia Telecommunications Oy | Transmission method and cellular radio network |
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| EP1107636A1 (en) * | 1999-12-10 | 2001-06-13 | Lucent Technologies Inc. | Mobile radio telecommunications system with improved hard handover |
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| WO2008131589A1 (en) | 2008-11-06 |
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