CN102202362A - Method and device for allocating incremental signaling - Google Patents
Method and device for allocating incremental signaling Download PDFInfo
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Abstract
The invention discloses a method and a device for allocating an incremental signaling during switching of multiple carrier waves, and can effectively reduce the expenditure of null wireless resources. The method for allocating the incremental signaling comprises the following steps that: a source base station sends a switching request to an object base station during the switching of the multiple carrier waves; and the object base station receives the switching request and allocates an object component carrier wave by taking at least one source component carrier wave as a reference. By adopting the method and the device, the expenditure of bytes for switching commands during the switching of the multiple carrier waves can be effectively reduced, the utilization ratio of the null wireless resources is improved, and the packet loss of sending a switching command by a null is reduced due to the reduction in the size of the switching command, so the probability of unsuccessfully sending the switching command is greatly reduced, and a favorable service experience is provided for a user.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of increment signaling configuration method and device.
Background technology
Advanced long-term evolution system (Long Term Evolution Advance, abbreviate LTE-A as) carrier aggregation technology (Carrier Aggregation proposed, abbreviate CA as), it can be UE (the User Equipment with respective capabilities, subscriber equipment) provides bigger bandwidth, and improve the peak rate of UE.Long evolving system (Long Term Evolution, abbreviate LTE as) in, the maximum downstream transmission bandwidth of system's support is 20MHz, and in LTE-A, can be by carrier aggregation with two or more component carrier (component carriers, abbreviating CC as) polymerization gets up to support that greater than 20MHz, maximum is no more than the transmission bandwidth of 100MHz, and Fig. 1 is the schematic diagram of carrier aggregation in the LTE-A system (upstream or downstream).
The frequency range that component carrier can use LTE to define also can be used the newly-increased specially frequency range as LTE-A.Whether continuous on frequency domain by each component carrier, carrier aggregation can be divided into continuous carrier aggregation and discrete carrier aggregation.By each component carrier whether in identical frequency band, carrier aggregation can be divided into the carrier aggregation of single band (single band) and stride the carrier aggregation of frequency band (over multiple frequency bands), so-called single carrier aggregation is meant all component carriers that participate in carrier aggregation all in same frequency band, and single carrier aggregation can be that continuous carrier aggregation also can be discontinuous carrier aggregation; The carrier aggregation that what is called is striden frequency band is meant that the component carrier that participates in carrier aggregation can be derived from different frequency bands.LTE-A UE with carrier aggregation ability sets up RRC (Radio Resource Control on the one-component carrier wave, Radio Resource control) after the connection, the base station can increase the component carrier that other can carry out carrier aggregation for it, be UE transceive data on a plurality of (maximum 5) component carrier simultaneously, and LTE UE can only be on the component carrier of a compatible LTE transceive data.
The RRC of LTE system (Radio Resource Control, Radio Resource control) layer is responsible for UE and eNB (Evolved NodeB, evolved base station) RRM of wave point between, comprise that eNB transmitting system message, beep-page message are to UE, realize that UE is connected foundation, keeps and deletes, mobile management of realization UE or the like function with RRC between the eNB.RRC is when carrying out RRM, the descending RRC message that eNB sends to UE all is by PDCCH (Physical DownlinkControl Channel, Physical Downlink Control Channel) the descending PDSCH of dynamic dispatching (PhysicalDownlink Shared Channel, Physical Downlink Shared Channel) after the resource, on the PDSCH resource of being dispatched, sends to UE's.Therefore in order to reduce the PDSCH resource overhead of descending RRC message, in the LTE system, the mode of increment signaling (delta signalling) configuration has been taked in the transmission of descending RRC message.
In wireless communication system, the command transmitting of eating dishes without rice or wine generally adopts ASN.1 (Abstract SyntaxNotation One, abstract syntax notation one) to encode, and in order to satisfy the problem of edition compatibility, allows optional (Optional) field to exist in the ASN.1 coding.In order to reduce the interface-free resources expense of RRC message, reduce the size of RRC message in the LTE system, the Optional field that has made full use of ASN.1 is carried out the configuration of increment signaling as far as possible.Concrete, when the LTE system carries out the ASN.1 coding description of RRC downstream message, increase the agreement mark by Optional field to ASN.1, eNB and UE are according to the Optional field in the descending RRC message of described agreement mark processing, thereby reach the configuration of increment signaling, reduce the byte-sized of RRC message, save the purpose of interface-free resources expense.It is especially obvious that the increment signaling is configured in the advantage that handoff procedure brings, the base station makes switching to determine it is because UE is too poor at the cell-of-origin signal quality under a lot of situations, because the signal quality of cell-of-origin is too poor, if switching command is too big, increase UE and do not received the possibility that switching command causes business to be hung up, adopted increment signaling configuration mode particularly important when therefore switching.
Below be that the switching command (being included in RRC connects in the reconfiguration message RRC Connection Reconfiguration message) of LTE sub-district marks for the agreement of several Optional fields in the example explanation LTE system with the switching target:
1, Need OP: carry the field of Need OP mark,, must receive in the LTE agreement so that the processing to this Optional field describes after this message to UE if do not carry this field in the descending RRC message.
In switching command, the upstream bandwidth of Target cell (ul-Bandwidth) is a Need OP field, if do not carry this field in the switching command, agreement offers some clarification on the behavior of UE so, be the downlink bandwidth that upstream bandwidth equals in the message to be sent, thereby can in switching command, save the shared space of ul-Bandwidth.
2, Need ON: carry the field of Need ON mark, if do not carry this field in the descending RRC message, regulation UE continues to use the presently used value of UE after receiving this message in the agreement so.
In switching command, measuring configuration field measConfig is Need OP field, if it is identical in the measurement configuration of cell-of-origin with UE that Target cell need dispose to the measurement configuration of UE, then the measurement configuration field can not carried in the base station in switching command, after UE receives switching command, continue to use measurement configuration, thereby save the expense of this field in the cell-of-origin.
3, Need OR: agreement is carried the field of Need OR mark, if do not carry this field in the descending RRC message, after regulation UE receives this message in the agreement so, stop using/delete the presently used value of UE, and/or delete the pairing function of this field.
In switching command, channel quality indication (Channel Quality Indicator, CQI) to report pattern (cqi-ReportModeAperiodic) field be Need OR to aperiodicity in, if the cell-of-origin disposes this field, but the Target cell that switches no longer expects to be provided with this field, then this field can not carried in the base station in switching command, after UE receives switching command, stops aperiodicity CQI and reports.Thereby can save the expense of this field.
In the carrier aggregation, UE may be simultaneously operated at most on 5 component carriers (can abbreviate carrier wave as), be that UE may be simultaneously operated in 5 coverages at most and overlapping arranged (coverage is identical, perhaps coverage is close, perhaps coverage is different but overlapping region is arranged) the sub-district on, the work carrier wave of these 5 sub-districts is respectively 5 different component carriers that can carry out carrier aggregation, the current component carrier of working of UE can be referred to as the work component carrier, and the work component carrier comprises downlink working component carrier and up work component carrier.The base station can be decided to be descending principal component carrier wave (Downlink Primary ComponentCarrier of UE configuration approximately by explicit configuration or according to agreement under UE was current, DL PCC) and up principal component carrier wave (Uplink Primary Component Carrier, UL PCC), DL PCC and UL PCC are referred to as PCC.DL PCC is never by the base station deexcitation, UE need be on DL PCC monitoring system message; UL PCC is responsible for sending the ascending control information of physical layer, such as the up feedback to downlink data, sends the uplink scheduling request, sends up channel state indication etc.DL PCC and UL PCC can have corresponding relation, and promptly DL PCC and UL PCC meet the duplex distance of LTE standard, and UL PCC is the up-link carrier of regulation among the DL PCC system message broadcasting SIB2 (SystemInformation Block2, System information block 2); Perhaps DL PCC and ULPCC can be by the base station flexible configuration, such as the base station is that UE has disposed two pairs of work carrier waves, be respectively DLCC1+ULCC1 and DL CC2+UL CC2, promptly DL CC1+UL CC1 and DLCC2+UL CC2 can constitute an independently sub-district respectively physically, in order to realize dispatching more flexibly, the DL PCC of this UE of base station configuration is DL CC 1, and UL PCC is UL CC2.If no special instructions, between DL PCC and the UL PCC corresponding relation is arranged all herein.Except PCC, other work component carriers be configured to auxilliary component carrier (Secondary Component Carrier, SCC), the SCC deexcitation that can be activated according to other scheduling of resource decision-makings of the size of service traffics or base station.
In the carrier aggregation, the base station can be according to the radio signal quality of each component carrier and other RRM strategies UE from multiple source component carrier (Source Component Carrier, S-CC, be component carrier that source base station is administered and that current UE is being worked) switch to a plurality of target component carrier waves (Target Component Carrier, T-CC, be the component carrier that target BS is administered), also can switch to single T-CC to UE from a plurality of S-CC, perhaps UE be switched to a plurality of T-CC from single S-CC.In above-mentioned handoff procedure, different with LTE is, will occur multiple source and/or a plurality of target CC in the handoff procedure, and on the one hand, the increment signaling configuration that single carrier switches to single carrier among the LTE can't realize in the system of carrier aggregation; On the other hand, compare the switching command of LTE, the entrained information of switching command of carrying a plurality of T-CC will be more, thereby cause switching command huger.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of multicarrier when switching increment signaling configuration method and device can effectively reduce the idle wireless resource expense.
For solving the problems of the technologies described above, the invention provides a kind of increment signaling configuration method, comprising:
When multicarrier switched, source base station sent handoff request to target BS, after target BS is received described handoff request, when configuration target component carrier, was the described target component carrier wave of reference configuration with at least one source component carrier.
Further, described multicarrier switching comprises any in the following situation: subscriber equipment (UE) switches to a plurality of target component carrier waves from the multiple source component carrier; UE switches to the single target component carrier from the multiple source component carrier; UE switches to a plurality of target component carrier waves from the single source component carrier.
Further, described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: target BS is provided with the configuration parameter of target component carrier wave according to the configuration parameter of described at least one source component carrier, promptly at structure during switching command, determine the Optional field of whether filling in the target component carrier wave according to the configuration parameter of the agreement mark of Optional field in the ASN.1 coding structure of switching command and described at least one source component carrier.
Further, described target BS sends to UE by source base station with switching command, after described UE receives described switching command, resolve described Optional field according to the configuration parameter of the source component carrier of the agreement of Optional field in the ASN.1 coding structure of switching command mark and the reference of described target BS institute.
Further, described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: described target BS is all target component carrier waves of reference configuration with source principal component carrier wave.
Further, described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: described target BS is a reference configuration target principal component carrier wave with source principal component carrier wave, is reference configuration target secondary component carrier with target principal component carrier wave.
Further, described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: for the source component carrier with frequently target component carrier wave, described target BS with source component carrier frequently be reference configuration described with the source component carrier with target component carrier wave frequently; For with the target component carrier wave of source component carrier alien frequencies, described target BS is a reference configuration target component carrier wave with the target component carrier wave that configured or with source principal component carrier wave.
Further, described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: described target BS is the described target component carrier wave of reference configuration with the source component carrier with the pairing of target component carrier wave; The unpaired message of described source component carrier and target component carrier wave sends to described target BS by described source base station, is perhaps determined by described target BS; Described target BS also carries the unpaired message of described source component carrier and target component carrier wave in switching command.
Further, described source base station also carries the Target cell that will switch in the handoff request message that target BS sends information, the information of described Target cell comprises frequency information and Physical Cell Identifier, perhaps comprises global cell identity information.
Further, the information of described Target cell also comprises the measured value of Target cell.
Further, described target BS notifies UE to insert the principal component carrier wave of target BS by switching command in the mode of demonstration or implicit expression.
For solving the problems of the technologies described above, the present invention also provides a kind of increment signaling inking device, comprising: handoff request sending module, handoff request receiver module and configuration module, wherein:
Described handoff request sending module is used for when multicarrier switches, and sends handoff request to destination end;
Described handoff request receiver module is used for the handoff request that the reception sources end sends;
Described configuration module, be used for handoff request that the handoff request receiver module receives that the source end sends after, when configuration target component carrier, be the described target component carrier wave of reference configuration with at least one source component carrier.
Adopt the method for the invention and device, the byte overhead of switching command in the time of can effectively reducing the multicarrier switching, thereby improve the utilance of idle wireless resource, simultaneously because the minimizing of the size of switching command, eat dishes without rice or wine to send the packet loss reduction of switching command, thereby switching command sends failed probability also to be reduced greatly, gives the good business experience of user.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the carrier aggregation schematic diagram according to correlation technique;
Fig. 2 is the switching flowchart of LTE system;
Fig. 3 is the application schematic diagram that single S-CC switches to many T-CC;
Fig. 4 is the application schematic diagram 1 that many S-CC switch to single T-CC;
Fig. 5 is the application schematic diagram 2 that many S-CC switch to single T-CC;
Fig. 6 is the application schematic diagram 1 that many S-CC switch to many T-CC;
Fig. 7 is the application schematic diagram 2 that many S-CC switch to many T-CC;
Fig. 8 is the application schematic diagram 3 that many S-CC switch to many T-CC;
Fig. 9 is that many S-CC switch to many T-CC, the schematic diagram of DL PCC and UL PCC flexible configuration.
Embodiment
The following flow process of switching of introducing earlier, the handoff procedure in the subsequent embodiment is all with reference to this flow performing.
In the LTE system, be example with the switching (X2 interface is the interface between base station and the base station) of X2 interface, after source base station was finished switch decision, hand-off execution process comprised the steps: as shown in Figure 2
Step 201, source base station (S-eNB) send handoff request (Handover Request) by X2 interface to target BS (T-eNB);
Carry UE in the handoff request at the UE of source base station contextual information (UE Contextinformation), carry the radio resource control configuration information (RRC Context) of UE in the contextual information of UE at source base station.
After step 202, target BS (T-eNB) receive handoff request, according to context and the T-eNB current resource operating position of the UE that carries in the handoff request at source base station, for UE sets up RAB (Radio Access Bearer, RAB), and be the UE allocation radio resource, and RAB information of being set up and the Radio Resource of distributing to UE are sent to source base station by switching request response (Handover Request Acknowledge) according to the RAB that sets up;
Target BS is that the Radio Resource that UE disposed finally need send to UE by switching command, described switching command is included in RRC and connects in the reconfiguration message (RRC ConnectionReconfiguration), and it is a son field of above-mentioned handover request ack message that described RRC connects reconfiguration message.As stated in the Background Art, in order to reduce the size of switching command, target BS is to be reference with the UE that receives at the RRC of cell-of-origin Context when the configuration switching command, carries out the configuration of increment signaling.
After step 203, source base station received switching request response, the switching command that target BS is disposed to UE sent to UE by air interface;
After step 204, UE receive switching command, handle the information of carrying in the switching command according to the described increment configuration rule of background technology, configuration according to switching command inserts target BS then, inserts successfully afterwards to send quite to be connected to reshuffle with the RRC of handoff completion message to target BS and finishes message (RRCConnection Reconfiguration Complete).
Need to prove, if there is not X2 interface directly to connect between the base station, so by S1 interface (base station and core network mobility management entity (Mobility Management Entity, MME) interface between) when switching, source base station also can send to target BS to UE at the RRC of source base station Context by the S1 interface, target BS sends to source base station to configuration information by the S1 mouth after carrying out the configuration of increment signaling according to RRC Context.
All embodiment of the present invention all switch with above switching flow.Describe the present invention program by the following examples in detail, below among all embodiment, for patent of the present invention is described more clearly, all with the example that switches between the base station, need to prove that method described in following examples is applicable to the switching of inside of base station (being that cell-of-origin and Target cell belong to same base stations control) too.
Inventive concept of the present invention is: when multicarrier switches, source base station sends handoff request to target BS, after target BS is received described handoff request, when configuration target component carrier, be the described target component carrier wave of reference configuration with at least one source component carrier.
Above-mentioned multicarrier switching comprises any in the following situation: UE switches to a plurality of target component carrier waves from the multiple source component carrier; UE switches to the single target component carrier from the multiple source component carrier; UE switches to a plurality of target component carrier waves from the single source component carrier.
Described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: target BS is provided with the configuration parameter of target component carrier wave according to the configuration parameter of described at least one source component carrier, promptly at structure during switching command, determine the Optional field of whether filling in the target component carrier wave according to the configuration parameter of the agreement mark of Optional field in the ASN.1 coding structure of switching command and described at least one source component carrier.
Described target BS sends to UE by source base station with switching command, after described UE receives described switching command, configuration parameter according to the source component carrier of the agreement of Optional field in the ASN.1 coding structure of switching command mark and the reference of described target BS institute is resolved described Optional field, to know the configuration of corresponding target component carrier wave.
Preferably, target BS is that reference configuration target component carrier wave specifically comprises following several mode with at least one source component carrier, correspondingly, UE resolve the reference of switching command time institute the source component carrier should to dispose the source component carrier of target component carrier time institute reference identical with target BS:
Mode one:
Described target BS is all target component carrier waves of reference configuration with source principal component carrier wave.
Mode two:
Described target BS is a reference configuration target principal component carrier wave with source principal component carrier wave, is reference configuration target secondary component carrier with target principal component carrier wave.
Mode three:
For with the source component carrier with frequently target component carrier wave, described target BS with source component carrier frequently be reference configuration described with the source component carrier with target component carrier wave frequently;
For with the target component carrier wave of source component carrier alien frequencies, described target BS is a reference configuration target component carrier wave with the target component carrier wave that configured or with source principal component carrier wave.
Mode four:
Described target BS is the described target component carrier wave of reference configuration with the source component carrier with the pairing of target component carrier wave; The unpaired message of described source component carrier and target component carrier wave sends to described target BS by described source base station, is perhaps determined by described target BS; Described target BS also carries the unpaired message of described source component carrier and target component carrier wave in switching command.
The increment signaling inking device of realizing said method comprises: handoff request sending module, handoff request receiver module and configuration module, wherein:
Described handoff request sending module is used for when multicarrier switches, and sends handoff request to destination end;
Described handoff request receiver module is used for the handoff request that the reception sources end sends;
Described configuration module, be used for handoff request that the handoff request receiver module receives that the source end sends after, when configuration target component carrier, be the described target component carrier wave of reference configuration with at least one source component carrier.
Embodiment one
Present embodiment is used for the application scenarios that instruction book S-CC switches to many T-CC.Shown in the application schematic diagram that Fig. 3 list S-CC switches to many T-CC, the UE work at present is on a carrier wave of source base station (S-eNB) (CC1), the sub-district of being worked is represented with S-CC1, certainly S-eNB also may be operated in carrier wave CC2 shown in dotted line and go up (also together, repeating no more among other embodiment); Target BS (T-eNB) is the adjacent base station of S-eNB, can be operated on carrier wave CC1 and the carrier wave CC2, and carrier wave CC1 and carrier wave CC2 can carry out carrier aggregation.
When UE moves to T-eNB, the signal quality of S-CC1 is variation gradually, and the signal quality of T-CC1 and T-CC2 improves gradually, and source base station is made the judgement of switching to target BS, UE is switched on two the carrier wave CC1 and CC2 of target BS, Target cell is represented with T-CC1 and T-CC2 respectively.
In the step 201, source base station in sending to the handoff request message of target BS except existing information of carrying, can also carry the information (for example identification information of T-CC1 and T-CC2) of its one or more Target cells that will switch to, described target cell information can be frequency information (ARFCN, absolute carrier frequency number), and Physical Cell Identifier (Physical Cell Identity, PCI), perhaps can be global cell identity information (E-UTRAN Cell GlobalIdentifier, ECGI).Preferably, described target cell information also can comprise the measured value (select PCC for target BS reference is provided) of this Target cell, measured value such as RSRP or RSRQ, if sub-district (such as the T-CC1 and the T-CC2 of the present embodiment) coverage that certain target BS can carry out carrier aggregation is identical with channel transfer characteristic close in other words, the measurement result of a Target cell just can be represented the every other signal quality that can carry out the sub-district of carrier aggregation with this Target cell, then do not need to increase above-mentioned information in the handoff request, all switch to the present invention among the embodiment of many T-CC, can carry the information of Target cell in the handoff request, hereinafter repeat no more, herewith explanation.
After target BS receives the handoff request message of source base station, according to entrained target cell information and other wireless resource management algorithms (Radio Resource Management, RRM), select T-CC1 to switch to the PCC of target BS as UE, target BS need inform that UE inserts PCC behind the target BS (selection of the described PCC of present embodiment and notify the mode of UE to be applicable to other all embodiment, hereinafter repeat no more) with T-CC1 as UE with explicit signaling (such as the field that increases expression PCC) or conceal signaling (such as be that UE distributes special-purpose random access guiding on the PCC only) in the switching command that is transmitted to UE by source base station.Target BS is according to the UE that the receives RRCContext at S-CC1 then, need be transmitted to the switching command of UE by source base station with the configuration of increment signaling configuration mode, the concrete configuration mode can for:
Particularly, target BS is provided with the configuration parameter of T-CC1 according to the configuration parameter of S-CC1, when the structure switching command, whether fill in the Optional field according to the agreement mark of Optional field in the ASN.1 coding structure of switching command and the configuration parameter decision of S-CC1.For example a certain configuration parameter in switching command is the Optional field, its agreement is labeled as Need ON, and compares S-CC1, and this configuration parameter of T-CC1 can be constant, then target BS can not carry this parameter in switching command, thereby reduces the byte overhead of switching command.
In addition because the configuration of the configuration of T-CC2 and T-CC1 is more approaching, therefore T-CC2 with T-CC1 as a reference, compare T-CC2 and carry out the configuration of increment signaling as a reference, can better reduce the byte overhead of switching command, improve the utilance of idle wireless resource with S-CC1.Such as, during random access resource on configuration T-CC1 and T-CC2, target BS is to distribute random access resource according to the current loading condition of target BS and the loading condition of statistics, T-CC2 probably can dispose identical random access resource with T-CC1, therefore can be the relevant fields specify of the random access resource in the ASN.1 coding structure of switching command the Optional field, and its agreement is labeled as Need OP, and increase protocol specification, if the base station does not dispose this field, then use the configuration identical with target P CC, target BS is when the random access resource of configuration on the T-CC2 so, if T-CC2 carries out the configuration of increment signaling as a reference with S-CC1, target BS need dispose the relevant field of random access resource on the T-CC2, if and T-CC2 carries out the configuration of increment signaling as a reference with T-CC1, then target BS does not just need to dispose the relevant field of random access resource on the T-CC2, thereby better reduces the byte overhead of switching command.
After UE receives switching command, judgement T-CC1 is PCC, the reference of disposing as the increment signaling with S-CC1 when resolving the configuration that T-CC1 is relevant in the switching command then, handle the configuration of T-CC1 according to the described increment configuration rule of background technology, promptly for the field that is set to Optional in the T-CC1 configuration, UE handles the configuration of T-CC1 according to the agreement mark of corresponding Optional field, particularly, do not have configuration and agreement to be labeled as the field of Need OP for the base station, UE handles this field according to protocol specification; Do not have configuration and agreement to be labeled as the field of Need ON for the base station, UE continues to use S-CC1 to go up the value of configuration; Do not have configuration and agreement to be labeled as the field of Need OR for the base station, the UE deletion is the value of the S-CC1 of preservation originally, the function of perhaps stopping using original this field to be correlated with.When resolving the relevant configuration of T-CC2 with the reference of T-CC1 as the configuration of increment signaling, handle the configuration of T-CC2 according to the described increment configuration rule of background technology, being UE according to target BS configuration switching command the time, identical increment signaling configuration mode is resolved, hereinafter all embodiment all can no longer elaborate with reference to above-mentioned explanation.
Mode 2, target CC (T-CC1 and T-CC2) all carry out the configuration of increment signaling as a reference with S-CC1.
After UE received switching command, judgement T-CC1 was PCC, and identical increment signaling configuration mode is resolved switching command according to target BS configuration switching command the time then.
After this, UE inserts target BS according to the configuration of switching command, and inserting successfully, the back sends handoff completion message (following all embodiment herewith illustrate, repeat no more) to target BS.
Embodiment two
Present embodiment is used to illustrate that many S-CC switch to the application scenarios of single T-CC, specifically divides two kinds of scenes to describe in detail.
In step 201, source base station the RRC Context that sends to target BS can carry UE in each cell-of-origin the configuration information of (S-CC1 and S-CC2), and with explicit signaling (such as the field that increases expression PCC) or conceal signaling (such as first S-CC that carries among the RRC Context) inform target BS wherein S-CC2 be the PCC of UE at source base station.Only need be for the situation that only switches to a T-CC or agreement target BS with the method for source PCC as the reference of increment signaling configuration, the source base station information that in sending to the RRC Context of target BS, only need carry configuration information or one of them S-CC of source PCC then.All switch to the present invention the embodiment of Target cell from many S-CC, and the entrained S-CC information of RRC Context can illustrate with reference to this, hereinafter repeats no more.
After target BS receives handoff request message,, dispose the switching command that need be transmitted to UE, specifically following configuration mode can be arranged by source base station with increment signaling configuration mode according to the RRC Context information that receives:
Mode 2, to carry out the configuration of increment signaling as a reference with source CC (S-CC1) frequently;
To carry out the configuration of increment signaling as a reference with source CC (S-CC1) frequently is because fewer with the parameter that needs between frequently to revise, and can further reduce the size of switching command.
After UE received switching command, identical increment signaling configuration mode was resolved switching command according to target BS configuration switching command the time.
Scene 2, a target CC and an equal alien frequencies of active CC are shown in the application schematic diagram that the many S-CC of Fig. 5 switch to single T-CC.The UE work at present is on two carrier wave CC1 and CC2 of source base station, and the sub-district of being worked is with S-CC1 and S-CC2 (PCC) expression.When UE moves to T-eNB, the signal quality of S-CC1 and S-CC2 is variation gradually, and the signal quality of T-CC3 improves gradually, and source base station is made the judgement of switching to target BS, UE is switched on the carrier wave CC3 of target BS.
After target BS receives handoff request message, with source PCC (S-CC2) as with reference to increment configuration switching command (in other embodiments also can source SCC as with reference to the configuration switching command), after UE received switching command, identical increment signaling configuration mode was resolved switching command according to target BS configuration switching command the time.
Embodiment three
Present embodiment is used to illustrate that many S-CC switch to the application scenarios of many T-CC, specifically divides three kinds of scenes to describe in detail.
After target BS receives handoff request message, select T-CC2 to switch to the PCC of target BS as UE, then according to the RRC Context that receives, need be transmitted to the switching command of UE by source base station with the configuration of increment signaling configuration mode, the concrete configuration mode can for:
Mode 2, target P CC (T-CC2) carry out the configuration of increment signaling as a reference with source PCC (S-CC2), and target SCC (T-CC1) carries out the configuration of increment signaling as a reference with target P CC more then;
Mode 3, target CC carry out the configuration of increment signaling as a reference with the same frequency source CC of correspondence respectively, and promptly T-CC1 disposes with reference to carrying out the increment signaling, and T-CC2 is with reference to carrying out the configuration of increment signaling with S-CC2.
After UE received switching command, identical increment signaling configuration mode was resolved switching command according to target BS configuration switching command the time.
Scene 2, only part target CC and part source CC be with frequently, and shown in the application schematic diagram that the many S-CC of Fig. 7 switch to many T-CC, the UE work at present is on two carrier wave CC1 and CC2 of source base station, and the sub-district of being worked is with S-CC1 and S-CC2 (PCC) expression.When UE when T-eNB moves, the signal quality of S-CC1 and S-CC2 is variation gradually, the signal quality of T-CC1, T-CC2 and T-CC3 improves gradually, source base station is made the judgement of switching to target BS, and UE is switched on T-CC1, T-CC2 and the T-CC3.
After target BS receives handoff request message, select T-CC3 to switch to the PCC of target BS as UE, then according to the RRC Context that receives, need be transmitted to the switching command of UE by source base station with the configuration of increment signaling configuration mode, the concrete configuration mode can for:
Mode 2, target P CC (T-CC3) carry out the configuration of increment signaling as a reference with source PCC (S-CC2), and target SCC (T-CC1 and T-CC2) carries out the configuration of increment signaling as a reference with target P CC more then;
Mode 3, select to carry out the configuration of increment signaling as a reference with source CC frequently with frequently target CC with source CC, the same frequency target CC that alien frequencies target CC selects to have configured (for example can arrange select first to configure same frequency target CC) carries out the configuration of increment signaling as a reference.
Frequently same such as T-CC1 in the present embodiment and S-CC1, T-CC2 and S-CC2 are with frequently, the order that target BS carries out the configuration of increment signaling is, at first be with reference to T-CC1 being carried out the configuration of increment signaling with S-CC1, being with reference to T-CC2 being carried out the configuration of increment signaling then with S-CC2, is with reference to T-CC3 being carried out the configuration of increment signaling at last with T-CC1.Configuration is earlier disposed alien frequencies CC again with frequency CC in the present embodiment, can not limit in other embodiments.If agreement is reference with first the same CC frequently that has configured, then because the T-CC1 of elder generation's configuration, therefore the configuration information of T-CC1 is positioned at the first place that target CC configuration information is tabulated in switching command, can judge in view of the above after UE receives that T-CC1 is first same frequency target CC that configures.In other embodiments, also can select other same frequency target CC that configured to carry out the configuration of increment signaling as a reference, as long as base station and UE appoint.
Mode 4, select to carry out the configuration of increment signaling as a reference with source CC frequently with frequently target CC with source CC, alien frequencies target CC selects source PCC to carry out the configuration of increment signaling as a reference.
Such as, in the present embodiment, T-CC1 disposes with reference to carrying out the increment signaling, and T-CC2 disposes with reference to carrying out the increment signaling, and T-CC3 is with reference to carrying out the configuration of increment signaling with S-CC2.
After UE received switching command, identical increment signaling configuration mode was resolved switching command according to target BS configuration switching command the time.
Scene 3, target CC and the equal alien frequencies of source CC, shown in the application schematic diagram that the many S-CC of Fig. 8 switch to many T-CC, the UE work at present is on two carrier wave CC1 and CC2 of source base station, and the sub-district of being worked is with S-CC1 and S-CC2 (PCC) expression.When UE moves to T-eNB, the signal quality of S-CC1 and S-CC2 is variation gradually, and the signal quality of T-CC3 and T-CC4 improves gradually, and source base station is made the judgement of switching to target BS, and UE is switched on T-CC3 and the T-CC4.
After target BS receives handoff request message, select T-CC3 to switch to the PCC of target BS as UE, then according to the RRC Context that receives, need be transmitted to the switching command of UE by source base station with the configuration of increment signaling configuration mode, the concrete configuration mode can for:
Mode 2, target P CC (T-CC3) carry out the configuration of increment signaling as a reference with source PCC (S-CC2), and target SCC (T-CC4) carries out the configuration of increment signaling as a reference with target P CC more then;
Mode 3, source base station choose the information of pairing CC, inform target BS in handoff request, and the pairing CC information that target BS chooses according to source base station is carried out the configuration of increment signaling.
Such as, the pairing CC information that source base station chooses is, T-CC3 and S-CC1 pairing, T-CC4 and S-CC2 pairing, after then target BS receives handoff request message, carry out the configuration of increment signaling as a reference with S-CC1 during configuration T-CC3, carry out the configuration of increment signaling as a reference with S-CC2 during configuration T-CC4.In the manner, target BS need inform in switching command that each target CC of UE carries out the reference source CC of increment configuration, for example can inform by display mode.
Mode 4, target BS select source CC to carry out the configuration of increment signaling as required flexibly, and inform that in switching command each target CC of UE carries out the reference source CC of increment configuration, for example can inform by display mode.
Such as, in the present embodiment, carry out the configuration of increment signaling as a reference with S-CC1 during target BS configuration T-CC3, carry out the configuration of increment signaling as a reference with S-CC2 during configuration T-CC4.
After UE received switching command, identical increment signaling configuration mode was resolved switching command according to target BS configuration switching command the time.
Need to prove, more than the described increment signaling configuration method of all embodiment be equally applicable to the situation of S-CC/T-CC more than two CC.
Embodiment four
Present embodiment is used to illustrate that DL PCC and UL PCC by the base station flexible configuration, do not have the situation of corresponding relation, i.e. the increment signaling of DL PCC and UL PCC configuration needs the situation of processing respectively, and the typical application scenarios that switches to many T-CC with many S-CC is an example.
Target CC and the equal alien frequencies of source CC as shown in Figure 9, the UE work at present is on two carrier wave CC1 and CC2 of source base station, the sub-district of being worked represents with S-CC1 and S-CC2, and the DL PCC that source base station is distributed to UE is the DL CC1 on the S-CC1, and UL PCC is the UL CC2 on the S-CC2.When UE moves to T-eNB, the signal quality of S-CC1 and S-CC2 is variation gradually, and the signal quality of T-CC3 and T-CC4 improves gradually, and source base station is made the judgement of switching to target BS, and UE is switched on T-CC3 and the T-CC4.
After target BS receives handoff request message, DL CC3 among the selection T-CC3 switches to the DL PCC of target BS as UE, UL CC4 among the selection T-CC4 switches to the UL PCC of target BS as UE, then according to the RRC Context that receives, with source PCC is the switching command that need be transmitted to UE with reference to the configuration of increment signaling by source base station, and the concrete configuration mode is:
Configuration on mode 1, the target downlink CC is all carried out the configuration of increment signaling as a reference with the configuration on the source DL PCC (DL CC1), and the configuration on the up CC of target is all carried out the configuration of increment signaling as a reference with the configuration on the UL PCC of source;
That is: the configuration on the up CC of target downlink CC and target is carried out the configuration of increment signaling with UE in configuration on the source base station DL PCC and the configuration on the UL PCC respectively as a reference.
The configuration of increment signaling is carried out in configuration on the source that the is configured to DL PCC (DL CC1) on mode 2, the target DL PCC (DL CC3) as a reference, and the configuration on the target DL SCC (DL CC4) is carried out the configuration of increment signaling as a reference with the configuration on the target DL PCC more then;
The configuration of increment signaling is carried out in configuration on the source that the is configured to UL PCC (UL CC2) on the target UL PCC (UL CC4) as a reference, and the configuration on the target UL SCC (UL CC3) is carried out the configuration of increment signaling as a reference with the configuration on the target UL PCC more then;
That is: the configuration on target DL PCC and the UL PCC is carried out the configuration of increment signaling with UE in configuration on the source base station DL PCC and the configuration on the UL PCC respectively as a reference, and the configuration on target DL SCC and the UL SCC is more respectively with being configured to reference to carrying out the configuration of increment signaling on target DL PCC and the target UL PCC then.
Adopt the above described increment signaling configuration method of each embodiment, target BS is when disposing each target CC for UE, can make full use of in the existing LTE system several agreements marks to ASN.1 Optional field, reduce the byte overhead of switching command, thereby improve the utilance of idle wireless resource, reduce switching command and send failed probability, give the good business experience of user.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. increment signaling configuration method comprises:
When multicarrier switched, source base station sent handoff request to target BS, after target BS is received described handoff request, when configuration target component carrier, was the described target component carrier wave of reference configuration with at least one source component carrier.
2. the method for claim 1 is characterized in that,
Described multicarrier switching comprises any in the following situation: subscriber equipment (UE) switches to a plurality of target component carrier waves from the multiple source component carrier; UE switches to the single target component carrier from the multiple source component carrier; UE switches to a plurality of target component carrier waves from the single source component carrier.
3. the method for claim 1 is characterized in that,
Described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: target BS is provided with the configuration parameter of target component carrier wave according to the configuration parameter of described at least one source component carrier, promptly at structure during switching command, determine the Optional field of whether filling in the target component carrier wave according to the configuration parameter of the agreement mark of Optional field in the ASN.1 coding structure of switching command and described at least one source component carrier.
4. method as claimed in claim 3 is characterized in that,
Described target BS sends to UE by source base station with switching command, after described UE receives described switching command, resolve described Optional field according to the configuration parameter of the source component carrier of the agreement of Optional field in the ASN.1 coding structure of switching command mark and the reference of described target BS institute.
5. the method for claim 1 is characterized in that,
Described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: described target BS is all target component carrier waves of reference configuration with source principal component carrier wave.
6. the method for claim 1 is characterized in that,
Described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: described target BS is a reference configuration target principal component carrier wave with source principal component carrier wave, is reference configuration target secondary component carrier with target principal component carrier wave.
7. the method for claim 1 is characterized in that,
Described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier:
For with the source component carrier with frequently target component carrier wave, described target BS with source component carrier frequently be reference configuration described with the source component carrier with target component carrier wave frequently;
For with the target component carrier wave of source component carrier alien frequencies, described target BS is a reference configuration target component carrier wave with the target component carrier wave that configured or with source principal component carrier wave.
8. the method for claim 1 is characterized in that,
Described target BS is that reference configuration target component carrier wave is meant with at least one source component carrier: described target BS is the described target component carrier wave of reference configuration with the source component carrier with the pairing of target component carrier wave; The unpaired message of described source component carrier and target component carrier wave sends to described target BS by described source base station, is perhaps determined by described target BS;
Described target BS also carries the unpaired message of described source component carrier and target component carrier wave in switching command.
9. method as claimed in claim 3 is characterized in that,
Described source base station also carries the Target cell that will switch in the handoff request message that target BS sends information, the information of described Target cell comprises frequency information and Physical Cell Identifier, perhaps comprises global cell identity information.
10. method as claimed in claim 9 is characterized in that,
The information of described Target cell also comprises the measured value of Target cell.
11. the method for claim 1 is characterized in that,
Described target BS notifies UE to insert the principal component carrier wave of target BS by switching command in the mode of demonstration or implicit expression.
12. an increment signaling inking device comprises: handoff request sending module, handoff request receiver module and configuration module, wherein:
Described handoff request sending module is used for when multicarrier switches, and sends handoff request to destination end;
Described handoff request receiver module is used for the handoff request that the reception sources end sends;
Described configuration module, be used for handoff request that the handoff request receiver module receives that the source end sends after, when configuration target component carrier, be the described target component carrier wave of reference configuration with at least one source component carrier.
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