CN101052208A - Switching method and switching network - Google Patents

Abstract

The method comprises: a) selecting the first destination switch net element as the destination switch net element; B) sending a terminal switch request to the first destination net element, which carries the information about the a standby destination switch net element; c) if the first destination switch net element allows the terminal to be switched into it; then the terminal is switched into it; otherwise, the first destination net element relays the switch request of the terminal to the standby destination switch net element; the terminal is switched into the standby destination net element. The terminal switch request carries the information of the destination e-NodeB such that when a switch from source e-NodeB to destination e-NodeB fails, the invention can send the terminal switch request to a second or third standby destination e-NodeB.

Description

A kind of changing method and handover network

Technical field

The present invention relates to the communications field, relate in particular to a kind of terminal switching method and handover network in the mobile communication.

Background technology

(Universal Mobile Telecommunications System is the 3-G (Generation Three mobile communication system) that adopts the WCDMA air interface technologies UMTS) to universal mobile telecommunications system, also the UMTS system is called the WCDMA communication system usually.The UMTS system has adopted and the similar structure of second generation mobile communication system, comprise Radio Access Network (Radio Access Network, RAN) and core network (CoreNetwork, CN).Wherein Radio Access Network is used to handle all and wireless function associated, and CN handles that all voice calls are connected with data in the UMTS system, and the exchange of realization and external network and routing function.CN from be divided in logic circuit commutative field (Circuit Switched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).(User Equipment UE) has constituted whole UMTS system together, and its system configuration as shown in Figure 1 for UTRAN, CN and subscriber equipment.

UTRAN is a land radio access web, it comprise one or several RNS (RadioNetwork Subsystem, RNS).(Radio NetworkController RNC) forms with one or more base stations (NodeB) RNS by a radio network controller.Interface between RNC and the CN is the Iu interface, and NodeB is connected by Iub interface with RNC.In UTRAN inside, interconnected by Iur between the RNC, Iur can connect or connect by transmission network by the direct physical between the RNC.RNC is used for distributing and is attached thereto with control or the Radio Resource of relevant NodeB.NodeB then finishes the conversion of the data flow between Iub interface and the Uu interface, also participates in a part of RRM simultaneously.The structure of UTRAN as shown in Figure 2.

NodeB is the base station (being radio receiving-transmitting unit) of WCDMA system, comprises radio receiving-transmitting unit and Base-Band Processing parts.By the Iub interface and the RNC interconnection of standard, mainly finish the processing of Uu interface physical layer protocol.Its major function is spread spectrum, modulation, chnnel coding and despreading, demodulation, channel-decoding, also comprises the functions such as mutual conversion of baseband signal and radiofrequency signal.

As shown in Figure 2, be the UTRAN network structure, wherein RNC is used to control the Radio Resource of UTRAN, mainly finishes functions such as connection foundation and disconnection, switching, the merging of grand diversity, RRM control.

The above network architecture is based on the 3GPP Re16 framework of version in the past, consider the competitiveness of future network, 3GPP is studying a kind of brand-new evolution network framework to satisfy the application demand of mobile network in 10 years futures even longer time, comprise the Long Term Evolution (LTE) of System Architecture Evolution (SAE) and Access Network, wherein the Access Network of evolution is called E-UTRAN.The target of network evolution is to be desirable to provide a kind of low time delay, high data rate, high power system capacity and covering, low cost, complete IP-based network.Owing to be a kind of brand-new network architecture, substantial variation all will take place in all nodes, function and the flow process of therefore existing framework.

In the future evolution network system, network evolution has multiple candidate scheme, and wherein popular have a two-layer node framework, and as shown in Figure 3, under this framework, enode (e-NodeB) is the NodeB after the evolution, the function of most RNC before having.IAD (Access GW) has former core net node, such as most of function or the function combinations of SGSN or GGSN.Under framework shown in Figure 3, a kind of switching flow between the e-NodeB is (with reference to RAN3#50 meeting motion of 3GPP R3-060026) as shown in Figure 4, comprises the steps:

S401, UE reporting measurement reports (Measurement Report);

S402, source e-NodeB carry out handover decisions (HO decision), select target e-NodeB, and the context of UE sent to target e-NodeB;

S403, target e-NodeB carry out resource allocation (Resource allocation) according to the UE context, and provide context transfer response (Context Transfer Response) signaling to source e-NodeB, comprise the whether successful information of resource allocation in this signaling, if be allocated successfully, then enter S408, otherwise enter S404;

S404, source e-NodeB send the resource query request to RRM database (RRM Database), search other target e-NodeB;

S405, RRM Database wherein comprise alternative target e-NodeB information to source e-NodeB feedback resources request response (Resource InquiryResponse);

S406, source e-NodeB send to alternative target e-NodeB with the context of UE;

S407, alternative target e-NodeB carry out resource allocation according to the UE context, and provide ContextTransfer Response (context transfer response) signaling to source e-NodeB;

S408, source e-NodeB carry out data forwarding to target e-NodeB;

S409, source e-NodeB send to UE and switch (Handover Command) signaling;

S410, UE send to switch to target e-NodeB and finish (Handover Command Complete) signaling;

S411, target e-NodeB are to Access GW transmit path handoff request;

S412, Access GW switch to target e-NodeB with the path, and to target e-NodeB transmit path switching request response (Path Switch Request ACK) signaling;

S413, Access GW cut release command (Path ReleaseCommand) to source e-NodeB transmit path, are discharged into the path of source e-NodeB.

From the step S403 of above flow process to S408, we can see, as target e-NodeB1 because reasons such as self network load or resource allocation failures, when not allowing to switch, need in context transfer response message, tell failure cause, source e-NodeB reselects a new target e-NodeB more then, such as target e-NodeB2.Tell source e-NodeB again after waiting until first target e-NodeB failure like this, source e-NodeB determines tangential second target e-NodeB again, and sends context transfer message to second target e-NodeB, and whole process is consuming time long.

In addition, at above-mentioned steps S402 in step S403, source e-NodeB1 is selecting the sub-district to carry out handover decisions for the first time, only utilize some pre-configured information of adjacent cells to carry out handover decisions, because cell status information is dynamic, such as: for current some state in adjacent sub-district, whether sufficient as local resource, as whether to have interference actual conditions can not be accurately predetermined in the pre-configured information.Therefore, the Target cell of determining at last may can't satisfy the user owing to inadequate resource.And behind a handoff failure, source e-NodeB just independently obtains this part information the RRM Database from one.This need additionally take time, and also long to the time of access of database, and this can further prolong the time delay of handoff preparation phase.Equally, the data in real time of fetching from RRM Database is capable not high, and equally there is the risk of failure in the next Target cell of Xuan Zeing like this.

Summary of the invention

The invention provides a kind of terminal switching method and handover network, in order to solve exist in the existing switching flow behind handoff failure, reselect the e-NodeB of switching and cause the long problem of time delay.

The inventive method comprises:

A kind of changing method, terminal provides access service by first network element, may further comprise the steps:

A, selection first destination switch net element are as destination switch net element;

B, send the terminal handoff request, carry alternative target switch net element information in the described terminal handoff request to first destination switch net element;

If C first destination switch net element allows the terminal incision, then described terminal incision is to first destination switch net element, otherwise first destination switch net element is forwarded to the alternative target switch net element with described terminal handoff request, and terminal is switched to the alternative target switch net element.

In the described steps A, described first network element is selected first destination switch net element and/or alternative target switch net element according to the measurement report that terminal sends.

In the described steps A, described first network element also carries out handover decisions according to the minizone wireless resource management information that obtains.

In the described steps A, described minizone wireless resource management information obtains one of in the following way:

From resource management server, obtain, or

From adjacent destination switch net element, obtain, or

Send the self-defining signaling message to described first network element from described resource management server or adjacent destination switch net element and to obtain.

Described minizone wireless resource management information comprises neighbor cell load and area interference information.

Among the described step B, described alternative target switch net element is a plurality of.

Described a plurality of alternative target switch net element has priority.

In the described terminal handoff request, carry a plurality of alternative target switch net element tabulations, carry precedence information in the described tabulation.

Among the described step C, if described first destination switch net element does not allow described terminal incision, then select the first alternative target switch net element according to described priority orders, and described terminal handoff request is forwarded to the described first alternative target switch net element by described first destination switch net element.

Among the described step C,, then described terminal handoff request is forwarded to the second alternative target switch net element by the first alternative target switch net element if the described first alternative target switch net element does not allow described terminal incision.

Among the described step C,, then described terminal handoff request is forwarded to a plurality of alternative target switch net element by described first destination switch net element if described first destination switch net element does not allow described terminal incision.

Among the described step C, described a plurality of alternative target switch net element are switched preparation according to described precedence information.

Among the described step C, described a plurality of alternative target switch net element are switched preparation according to described precedence information, further comprise:

The alternative target switch net element of first priority is carried out parsing, preservation, the reservation of terminal handoff request and is distributed respective resources; And/or

The alternative target switch net element of second priority is carried out parsing, the preservation of terminal handoff request.

Described method also comprises alternative target switch net element deletion terminal handoff request and/or discharges the step of resource.

Described alternative target switch net element deletion terminal handoff request and/or release resource, adopt following method:

After the switching that first network element receives certain alternative target switch net element is ready to complete message, send deletion/release message to other alternative target switch net element, or

First network element receives after terminal switches to certain alternative target switch net element, sends deletion/release message to other alternative target switch net element, or

The time threshold of deletion terminal handoff request is set, reach described time threshold after, send deletion/release message to other alternative target switch net element.

Among the described step C, in described a plurality of alternative target switch net element, choose at first and carry out the terminal switching to the alternative target switch net element of first network element transmission terminal switching request response.

Among the described step C,, then initiate switching flow again if described first network element is not received the terminal switching request response of alternative target switch net element in very first time threshold value.

Among the described step C, comprise that also first destination switch net element carries out the step of prioritization again to described a plurality of alternative target switch net element.

Described terminal handoff request is by context transfer message context transfer or handoff request message handover request carrying.

Among the described step C, described terminal handoff request is transmitted by IAD.

Described first network element can be an evolution base station, also can be the control unit of evolution base station, and/or

Described first destination switch net element and/or alternative target switch net element can be evolution base stations, also can be the control units of evolution base station.

A kind of handover network comprises first network element and first destination switch net element, also comprises:

Terminal handoff request transmitting element is positioned at first network element, is used for sending the terminal handoff request to first destination switch net element;

Alternative target switch control unit information setting unit is positioned at first network element, is used in described terminal handoff request information alternative target switch control unit information being set;

Terminal handoff request retransmission unit is positioned at first destination switch net element, is used for transmitting described terminal handoff request to the alternative target switch control unit.

Described network also comprises:

The first prioritization unit is positioned at first network element, is used for a plurality of alternative target switch control units are carried out prioritization.

Described network also comprises:

The second prioritization unit is positioned at first destination switch net element, is used for a plurality of alternative target switch control units are carried out prioritization again.

Described network also comprises counter unit, is used to set the terminal switching request response time threshold of alternative target switch control unit.

A kind of changing method, terminal provides access service by first network element, may further comprise the steps:

A, at least two destination switch net element of selection;

B, first network element send the terminal handoff request to described destination switch net element, carry the precedence information of described destination switch net element in the described request;

C, according to described precedence information, carry out the terminal handover operation.

Among the described step C, described destination switch net element also comprises the step of switching preparation according to described precedence information after receiving described terminal handoff request message.

Described destination switch net element is switched preparation, further comprises:

The destination switch net element of first priority is carried out parsing, preservation, the reservation of terminal handoff request and is distributed respective resources; And/or

The destination switch net element of second priority is carried out parsing, the preservation of terminal handoff request.

Described method also comprises destination switch net element deletion terminal handoff request and/or discharges the step of resource.

Described destination switch net element deletion terminal handoff request and/or release resource, adopt following method:

After the switching that first network element receives certain destination switch net element is ready to complete message, send deletion/release message to other destination switch net element, or

First network element receives after terminal switches to certain destination switch net element, sends deletion/release message to other destination switch net element, or

The time threshold of deletion terminal handoff request is set, reach described time threshold after, send deletion/release message to destination switch net element.

Among the described step C,, then initiate switching flow again if described first network element is not received the terminal switching request response of destination switch net element in very first time threshold value.

Among the described step C, in described a plurality of destination switch net element, choose at first and carry out the terminal switching to the destination switch net element of first network element transmission terminal switching request response.

Described first network element can be an evolution base station, also can be the control unit of evolution base station, and/or

Described destination switch net element can be an evolution base station, also can be the control unit of evolution base station.

A kind of handover network comprises first network element and a plurality of destination switch net element, also comprises:

Terminal handoff request transmitting element is positioned at first network element, is used for sending the terminal handoff request to destination switch net element;

Priority is provided with the unit, is used for being provided with in described terminal handoff request the precedence information of destination switch net element.

Terminal handoff request processing unit is positioned at described destination switch net element, is used for according to described terminal handoff request terminal being carried out handover operation.

Described network also comprises:

Switch preparatory unit, be positioned at described destination switch net element, be used for switching preparation according to described precedence information.

Described network also comprises:

Counter unit is positioned at described first network element, is used for the terminal switching request response time threshold of target setting switch control unit.

Adopt the present invention program, the information of in terminal handoff request information, carrying alternative target e-NodeB, like this as source e-NodeB the time to certain target e-NodeB handoff failure, can be by the present invention quickly to second or the 3rd alternative target e-NodeB forwarding terminal handoff request, reduce to switch and prepare time delay, improve handover success rate.

Adopt the present invention program, terminal can send the terminal handoff request to a plurality of target e-NodeB simultaneously, and by these a plurality of target e-NodeB according to the precedence information that carries in the terminal handoff request, be that described terminal is carried out and switched according to predetermined rule.Can reduce to switch and prepare time delay, improve handover success rate.

Adopt the present invention program, when RRM information is also nonsynchronous between each e-NodeB, if last time target e-NodeB had more real-time RRM information, then can determine whether carry out the optimization of secondary handover decisions, thereby initiate the terminal handoff request to alternative other targets e-NodeB.

Description of drawings

Fig. 1 is a UMTS system configuration schematic diagram in the prior art;

Fig. 2 is a UTRAN schematic network structure in the prior art;

Fig. 3 is the evolution architecture schematic network structure of two-layer node in the prior art;

Fig. 4 is the terminal switching flow schematic diagram under Fig. 3 framework;

Fig. 5 is an evolution architecture schematic network structure of the present invention;

Fig. 6 and Fig. 7 are the present invention program one network element structural representation;

Fig. 8 is the present invention program one a terminal switching flow schematic diagram;

Fig. 9 is the refinement schematic flow sheet of step S850 among Fig. 8;

Figure 10 and Figure 11 are the present invention program two network element structural representation;

Figure 12 is the present invention program two a terminal switching flow schematic diagram;

Figure 13-Figure 15 is respectively the schematic flow sheet of embodiment of the invention 1-3.

Embodiment

Below in conjunction with Figure of description the specific embodiment of the present invention is described.

In evolvement network, as shown in Figure 5, be included as terminal access e-NodeB501 is provided, and access gateway node (GW) 502, terminal can be switched between each e-NodeB501, so that different e-NodeB501 provides access service for it.

On the framework of evolvement network, can be on the original basis, increase the pattern that control and function are separated, the management function that is the terminal switching controls in the network is separated, form new functional unit, we can be decided to be switch control unit 503, and this functional unit can be carried out the switching control function of former e-NodeB501, most of RRM (RRM) function is for the UE that inserts provides the Radio Resource controlled function.

In the switching flow of prior art, as target e-NodeB1 because reasons such as self network load or resource allocation failures, when not allowing to switch, need notification source e-NodeB, reselected a new target e-NodeB again and re-executed switching flow by source e-NodeB, so complete switching flow is consuming time long.Core concept of the present invention is to improve the terminal handover success rate as far as possible, the handover delay when the shortening terminal is reselected target e-NodeB.The present invention adopts following scheme in view of the above:

Scheme one:

As Figure 6 and Figure 7, be the present invention program one evolution architecture schematic network structure, as seen from the figure, handover network structure of the present invention mainly comprises:

First network element 600 and second network element 700, for terminal provides access service, this first network element 600 and second network element 600 can be e-NodeB at the solution of the present invention, can be the switch control unit that e-NodeB is controlled also, be used to provide terminal to insert required every function.This first network element 600 and second network element 700 both can be used as the source network element that terminal provides access service, also can be used as the destination switch net element that terminal is switched, and this role depends on the terminal position.For terminal provides access service, will switch to second network element 700 by terminal current for tentative first network element 600 of the present invention program.Can be provided with the destination switch net element that a plurality of terminals can be switched in the above-mentioned network.

The present invention increases setting in above-mentioned network configuration:

Terminal handoff request transmitting element 601 is positioned at first network element 600, is used for sending the terminal handoff request to second network element 700;

The alternative target switch control unit is provided with unit 602, is positioned at first network element 600, is used in described terminal handoff request information alternative target switch control unit information being set;

Terminal handoff request retransmission unit 701 is positioned at second network element, is used for transmitting described terminal handoff request information to the alternative target switch control unit.

In the such scheme, can also be provided with:

The first prioritization unit 603 is positioned at first network element 600, is used for a plurality of alternative target switch control units are carried out prioritization;

The second prioritization unit 702 is positioned at second network element, is used for again a plurality of alternative target switch control units being carried out prioritization;

Counter unit 604 is used to set the terminal switching request response time threshold of alternative target switch control unit.

Corresponding, the terminal switching flow of scheme one adopts the switching of switch control unit control terminal between each e-NodeB as shown in Figure 8 in the scheme one.Here the switch control unit of establishing source e-NodeB is the source switch control unit, and the switch control unit of target e-NodeB is the target switch control unit.

As seen from the figure, the present invention mainly may further comprise the steps:

S810, terminal send measurement report to the source switch control unit, and the source switch control unit is according to described measurement report select target switch control unit;

The measurement report that the source switch control unit is sent up according to UE can be obtainable about RRM information in conjunction with self, carries out handover decisions, the select target switch control unit.Herein, the present invention requires the source switch control unit not only to select a target switch control unit, but can select 1 to a plurality of alternative target switch control units, and these alternative target switch control units are carried out priority ordering.The measurement report that the load information of the sub-district of the contiguous switch control unit that this priority ordering can obtain according to the source switch control unit or other information and UE report.In order to improve switch speed and success rate, ordinary circumstance need be with 1 to a plurality of alternative switch control unit information in terminal handoff request information.

S820, source switch control unit send the terminal handoff request to the first target switch control unit, carry alternative target switch control unit information in the described terminal handoff request;

Terminal handoff request herein, be referred to as context (context transfer) in some technology at present, also be referred to as handover preparation request, be that the source switch control unit is issued the target switch control unit, require the target switch control unit to switch the message of preparation.Generally comprise the context (context) of UE.

When not having direct interface between source switch control unit and the target switch control unit, can carry out transfer by other nodes, such as Access GW, this moment, Access GW also may do simple process.The present invention requires to increase a content in terminal handoff request information, is exactly other target switch control unit information of determining in step S200, is referred to as the alternative target switch control unit.The alternative target switch control unit will comprise the target cell information that it has.

S830, the first target switch control unit judge whether the first target e-NodeB allows the terminal incision, if enter step S840, otherwise enter step S850;

S840, terminal are cut to the first target e-NodeB;

The first target switch control unit is according to the content in the terminal handoff request information, for resource reservation or preparation are done in switching.If the target switch control unit allows the terminal incision,,, finish the handoff procedure of terminal according to relevant switching flow of the prior art with going up the relevant information that allows incision then to source switch control unit loopback terminal handoff request information.

S850, the first target switch control unit are forwarded to the alternative target switch control unit with described terminal handoff request information, and described terminal is switched to alternative target e-NodeB.

When the first target switch control unit does not allow terminal incision, then in the source switch control unit loopback terminal handoff request information with on do not allow the relevant information cut and the cause value of failure.

The present invention program can in the terminal handoff request information will with on the alternative target switch control unit selected of the first target switch control unit for information about.Simultaneously, the first target switch control unit is transmitted to alternative switch control unit with described terminal handoff request information.

The present invention program adopts the first target switch control unit to alternative target switch control unit transfer terminal handoff request information.The first target switch control unit determines that the alternative target switch control unit can select according to the priority that source switch control unit in the step S810 is discharged.Simultaneously, the first target switch control unit can have the chance of double optimization handover decisions.

In the evolvement network in future, the RRM information that handover decisions is played an important role might be distributed, and the RRM information that each switch control unit obtains might be nonsynchronous.If this moment, the first target switch control unit was just because other switch reasons or other Event triggered reasons so, can obtain information such as the load of more real-time relevant other alternative target switch control units or interference, then the first target switch control unit can carry out the second time decision-making of handover optimization, selects a better target switch control unit in the alternative switch control unit that provides from the source switch control unit.A kind of asynchronous system that each switch control unit obtains other sub-districts RRM information information such as () load information is, when switch each minizone, in the terminal handoff request information with on the relevant RRM information of Target cell.

After the terminal handoff request information that turns over during the alternative target switch control unit receives, can carry out resource earlier and prepare, if allow to switch, then loopback terminal handoff request information success message is given the source switch control unit.The source switch control unit begins to carry out switching flow.If do not allow to switch, then there are 2 kinds of possibilities:

The one, continue transfer terminal handoff request information and give next alternative target switch control unit.The decision-making technique of transfer is the same with the first target switch control unit among the step S850.This moment, this alternative target switch control unit can be regarded the first target switch control unit as.Here last time kaput target switch control unit does not allow once more as the target switch control unit.Another kind may be the transfer that the alternative target switch control unit no longer carries out terminal handoff request information, directly is with cause value in the message terminal handoff request information of loopback source switch control unit.

Above-mentioned steps S850, can be according to refinement flow processing shown in Figure 9:

S910, the first target switch control unit can be selected whether to send terminal handoff request information to a plurality of alternative switch control unit transfers.

S920, for all doing a plurality of target switch control units of switch preparing, issuing the fastest alternative target switch control unit of source switch control unit success response will become final switching target.

Therefore require the alternative target switch control unit of resource reservation success all to need to send response message to the source switch control unit.

S930, other have done resource reservation and have not finally become the alternative target switch control unit that switches realistic objective and can delete oneself resource reservation within a certain period of time, wait for that perhaps the source switch control unit sends one and deletes message.

The step of alternative target switch control unit deletion terminal handoff request and release resource, can adopt following method:

After the switching that the source switch control unit receives certain alternative target switch control unit is ready to complete message, send deletion/release message to other alternative target switch control units, or

The source switch control unit receives after terminal switches to certain alternative target switch control unit, sends deletion/release message to other alternative alternative target switch control units, or

The time threshold of deletion terminal handoff request is set, reach described time threshold after, send deletion/release message to other alternative target switch control units.

The alternative target switch control unit of S940, the failure of resource reservation own then can send the response (response) of a failure to the source switch control unit, also can not send.

Here just there is a kind of possibility, when all alternative target switch control units are all failed, if do not send failure response to the source switch control unit, the source switch control unit then needs to be provided with a timer so, if do not receive response within a certain period of time, then initiate secondary switching action.

Among the step S850 for the present invention program, the alternative target switch control unit also can be refused terminal handoff request information is carried out transfer.At this moment, if the alternative target switch control unit is thought the important role of double optimization, and this moment is own to very real-time relevant RRM information, then can refuse to carry out transfer, directly response of response source switch control unit is given back the source switch control unit again to handover decisions.The source switch control unit carries out handover decisions again.

In the such scheme, after a plurality of alternative target switch control units receive described terminal handoff request, can switch preparation, comprise according to described precedence information:

The alternative target switch control unit of first priority carries out parsing, preservation, the reservation of terminal handoff request and distributes respective resources; And/or

The alternative target switch control unit of second priority carries out parsing, the preservation of terminal handoff request.

Above-mentioned first priority and second priority can be set according to actual conditions, can be provided with respectively more than an alternative target switch control unit in each priority.By the setting of first priority and second priority, just the alternative target switch control unit can be divided into two parts like this:

A part is carried out parsing, preservation, the reservation of terminal handoff request and is distributed respective resources after receiving the terminal handoff request, has in fact carried out all preparations that terminal is switched;

After another part is received the terminal handoff request, only carry out the parsing and the preservation of terminal handoff request; In fact only switch for terminal and done partly to prepare.

Employing scheme one can be provided with the resource of alternative target switch control unit more neatly, improves the flexibility and the reasonable resources utilization of system.Carry out switching for the first time under the situation of attempting failing at the source switch control unit, the speed that can accelerate to switch improves success rate for switching.Especially at RRM under nonsynchronous situation on each switch control unit, the target switch control unit oneself is not allowing under the situation about cutting, if the RRM information of other target switch control units of understanding that this moment can be real-time, then there is the possibility that handover decisions is carried out optimizing for the second time, further improved handover success rate.

In the such scheme one, switch control unit can be positioned at e-NodeB, or IAD, or intermediate node.This switch control unit can hardware form exist, form that also can software exists, no matter exist with the sort of form, can be arranged on different positions, these schemes are consistent with the present invention program all substantially still in form.

In the such scheme one, described terminal handoff request information can be by context transfer message contexttransfer or handoff request message handover request carrying.

In the such scheme one, by carrying alternative target switch control unit information in the terminal handoff request, make and to satisfy under the situation of terminal handoff request at the target switch control unit, can promptly transmit described terminal handoff request to the alternative target switch control unit, make terminal promptly to switch to the alternative target switch control unit, reduced because target target switch control unit is can't satisfy the terminal handoff request time, repeated to other target target switch control unit request time delay for switching.

Such scheme one is that the network architecture with switch control unit control e-NodeB illustrates, in actual applications, also can adopt e-NodeB self to finish the controlled function of relevant handover operation, at this moment corresponding switch control unit replaces with corresponding e-NodeB and gets final product, and principle is consistent with process and scheme one.

Scheme two

The evolution network structure and the scheme one that adopt in the scheme two are similar, comprise first network element and a plurality of destination switch net element, for terminal provides access service, this first network element and destination switch net element, can be e-NodeB, can be the switch control unit of e-NodeB also, be used to provide terminal to insert required every function.This first network element and destination switch net element both can be used as the source network element that terminal provides access service, also can be used as the destination switch net element that terminal is switched, and this role depends on the terminal position.For terminal provides access service, will switch to destination switch net element by terminal current for scheme two tentative first network elements.

As shown in Figure 10 and Figure 11, scheme two increases setting in above-mentioned network configuration:

Terminal handoff request transmitting element 1001 is positioned at first network element 1000, is used for sending the terminal handoff request to a plurality of destination switch net element;

Priority is provided with unit 1002, is positioned at described first network element, is used for being provided with in described terminal handoff request the precedence information of destination switch net element.

Terminal handoff request processing unit 1101 is positioned at described destination switch net element, is used for according to described terminal handoff request terminal being carried out handover operation.

In the such scheme, can also be provided with:

The first prioritization unit 1003 is positioned at first network element, is used for a plurality of alternative target switch control units are carried out prioritization;

Switch preparatory unit 1102, be positioned at described destination switch net element, be used for switching preparation according to described precedence information;

Further this scheme can also comprise:

The second prioritization unit 1103 is positioned at destination switch net element, is used for again a plurality of alternative target switch control units being carried out prioritization;

Counter unit 1004 is used to set the terminal switching request response time threshold of alternative target switch control unit.

Corresponding, the terminal switching flow of scheme two as shown in figure 12, the switching of terminal between each e-NodeB is by e-NodeB self control in the scheme two, terminal is switched to target e-NodeB by source e-NodeB.Adopt terminal context carried terminal handoff request, as can be seen from Fig. 12, mainly may further comprise the steps:

S1210, terminal send measurement report to source e-NodeB.

S1220, source e-NodeB carry out handover decisions, determine at least two target e-NodeB.

In this step, source e-NodeB carries out handover decisions according to the minizone RRM information of this measurement report and self acquisition, determines at least two target e-NodeB.Described minizone RRM information comprises information such as neighbor cell load and area interference.

Owing to the existing way difference of RRM server (Server), obtain the also corresponding difference of mode of minizone RRM information.If the RRM server is centralized situation, i.e. corresponding RRM Server of all e-NodeB.This situation can adopt the Event triggered mode to visit RRM Server and obtain wireless resource management information between neighbor cell, or RRM Server periodically sends wireless resource management information between neighbor cell to e-NodeB.If there are a plurality of RRM Server, promptly when the corresponding respectively e-NodeB of each RRMServer or several wireless RRM Server, e-NodeB then can be directly from the RRM Server of correspondence between the acquisition neighbor cell.

Above-mentioned e-NodeB also can directly obtain wireless resource management information between neighbor cell by Signalling exchange each other.After terminal is being carried out handoff failure, the pairing cell information of the target e-NodeB of handoff failure can be sent to source e-NodeB, source e-NodeB can be with the wireless resource management information of these information as this sub-district.

Above-mentioned source e-NodeB can determine handover decisions according to information such as terminal PRI or Target cell loads.Such as: when learning that based on some RRM information first Target cell load reaches some ratios (for example 70%), think that there is certain risk in the terminal access, thereby select to send the terminal handoff request to the second even the 3rd alternative target e-NodeB simultaneously, this terminal handoff request is by the terminal load-bearing context in this step, the timer parameter etc. that can carry different separately priority sequence numbers in the above-mentioned terminal context and be used to delete context, reserved resource.

S1230, source e-NodeB send context to determined a plurality of target e-NodeB, carry the precedence information of described target e-NodeB in the described context.

S1240, target e-NodeB carry out the handover operation of terminal according to described context.

Target e-NodeB carries out the handover operation of terminal according to the precedence information that carries in the described context, switches to described target e-NodeB.

In this step, according to described precedence information, allow the terminal incision if come the foremost target e-NodeB of priority, then terminal is directly cut to this target e-NodeB, otherwise the target e-NodeB of a back priority judges, if allow the terminal incision, then the terminal incision is to this target e-NodeB, and the rest may be inferred.

When terminal is switched, need between e-NodeB, shift the context of terminal between e-NodeB.And no matter network configuration is two-layer node or three node layers, all need shift context between e-NodeB.When not having actual interface between the e-NodeB, may need upper layer node to do transfer, but not influence realization of the present invention.

In following specific embodiments of the invention, think to have logic interfacing between the e-NodeB.The context of terminal mainly comprises some parameters, as the relevant permanent or temporary mark of: terminal, relative address, Qos parameter, safety encipher parameter and base station or the cell ID or the address of terminal, and the configuration information of the sign of core net node or address, radio bearer etc.Shifting contextual purpose is to prepare for access judgement and resource before target e-NodeB is switched.

In actual handover process, if the target e-NodeB that switches is because situations such as resource anxieties, terminal possibly can't be successfully synchronous, and terminal has been got back to the cell-of-origin among the e-NodeB of source, this moment terminal notification source e-NodeB handoff failure and failure cause.If cause failure by network side, source e-NodeB judges whether also have the resource abundance among the target e-NodeB of current this terminal correspondence, if having, then notifies terminal to switch once more; If there is not the resource abundance, then can obtain minizone RRM information and failure cause in conjunction with failure cause and body, carry out handover decisions once more, determine target e-NodeB.

Below lift specific embodiment and describe technical scheme of the present invention in detail.

Embodiment 1:

Referring to shown in Figure 13, be the schematic flow sheet of embodiment 1, as seen from the figure, mainly may further comprise the steps:

S1301, terminal send test report to source e-NodeB.

S1302, source e-NodeB carry out handover decisions, choose a plurality of alternative target e-NodeB.

After source e-NodeB receives this test report, carry out handover decisions, determine a plurality of target e-NodeB according to the adjacent sub-district RRM information that obtains.

S1303, source e-NodeB send the context of described terminal respectively to each target e-NodeB, wherein also contain target e-NodeB tabulation, and the precedence information between target e-NodeB.

After S1304, target e-NodeB receive this context, judge according to precedence information whether self priority is the highest, if, execution in step S1305 then; Otherwise, then enter step S1310.

S1305, target e-NodeB are this terminal distribution resource.

S1306, judge whether success of resource allocation, if the resource allocation success enters step S1307; If the resource allocation failure, target e-NodeB sends the response that context transmits failure to source e-NodeB, wherein carries failure cause, execution in step S1311.

S1307, target e-NodeB transmit the target e-NodeB that the information of failing sends to next priority according to precedence information with this context, return step S1306.

S1308, target e-NodeB transmit successful response to source e-NodeB context.

After S1309, source e-NodeB receive the response of context transfer success, send switching command, switch with the target e-NodeB of indicating terminal resource allocation success in step S1305 to terminal.

After S1310, terminal were received switching command, beginning was switched to target e-NodeB.

S1311, enter wait state.

Embodiment 2:

Referring to shown in Figure 14, the flow process of embodiment 2 is as follows:

S1401, terminal send test report to source e-NodeB.

S1402, source e-NodeB carry out handover decisions, choose a plurality of alternative target e-NodeB.

S1403, source e-NodeB send described terminal handoff request to each target e-NodeB respectively, wherein contain target e-NodeB tabulation, and the precedence information between target e-NodeB.

After S1404, target e-NodeB receive the terminal handoff request, if determine that according to precedence information self priority is the highest, if enter step S1405, otherwise enters step S1411.

S1405, target e-NodeB are this terminal distribution resource.

S1406, source e-NodeB judge whether success of target e-NodeB resource allocation, if success, execution in step S1407 then, if unsuccessful, execution in step S1409.

S1407, source e-NodeB send switching command to terminal, and the target e-NodeB of indicating terminal resource allocation success in step S1406 switches execution in step S1408.

S1408, terminal are switched to target e-NodeB according to switching command.

S1409, source e-NodeB transmit the target e-NodeB that the information of failing sends to next priority in the target e-NodeB tabulation, execution in step S1410 according to precedence information with this terminal handoff request.

The target e-NodeB of S1410, described next priority is this terminal distribution resource, returns step S1406.

S1411, enter wait state.

In the foregoing description 1, after the highest target e-NodeB resource allocation of priority failure, notify the target e-NodeB of next priority by source e-NodeB, and among the embodiment 2, after target e-NodeB resource allocation failure, notify the target e-NodeB of next priority by this target e-NodeB.

In the foregoing description 1 and 2, for receiving the target e-NodeB that contains target e-NodeB tabulation, if self be not limit priority, also can be earlier carry out resource allocation at the context of this terminal, and then enter wait state, after the notice of the target e-NodeB resource allocation failure of receiving a last priority, directly distribution result can be sent to source e-NodeB.

Embodiment 3:

Figure 15 shows that the schematic flow sheet of the embodiment 3 of the inventive method, detailed process is as follows:

S1501, terminal send measurement report to source e-NodeB.

S1502, source e-NodeB carry out handover decisions, choose a plurality of alternative target e-NodeB.

Source e-NodeB selects a plurality of target e-NodeB in this step, and these targets e-NodeB is carried out priority ordering.

The priority of above-mentioned terminal can preestablish, and perhaps makes amendment mode that also can online dynamic adjustment by static mode.

Narration for convenience, below with target e-NodeB tabulation medium priority the highest be called the first target e-NodeB, according to priority orders, be followed successively by the second target e-NodeB, the 3rd target e-NodeB, the 4th e-NodeB etc. by that analogy, N is preferential is called e-NodeB, and N is the integer greater than 1.

S1503, according to determined target e-NodeB tabulation among the step S1502, source e-NodeB wherein carries target e-NodeB tabulation and precedence information to the context that a plurality of target e-NodeB send terminals.

Here, the user that source e-NodeB is higher to some priority ratio, perhaps at the heavier sub-district of some load, in order to make the terminal that needs to switch to search out switching cell fast, reliably, can consider to send to the first target e-NodeB, the second target e-NodeB simultaneously the context of switching terminal, carry switching target e-NodeB tabulation simultaneously, and target e-NodeB (sub-district) receives that there are two kinds of situations in the processing behind the context of this terminal:

The target e-NodeB that priority is high, such as: come front first priority n (the individual target e-NodeB of 1＜=n＜=m), receive this context after, to resolving, preserve, reserve behind this context and distributing respective resources;

The target e-NodeB that priority is low, such as: the individual target e-NodeB of k (k=m-n) that comes back second priority does parsing, preserves and handle this context.

S1504, the first target e-NodeB be message transfer based on context, for resource allocation is carried out in this switching.

S1505, other receives contextual target e-NodeB, can only do contextual parsing and preservation, after also can resolving or preserve this context, carry out resource allocation, enters wait state then.

S1506, when first target e-NodeB resource allocation success, when allowing the terminal incision, the first target e-NodeB sends the response message of context transfer success, execution in step S1510 to source e-NodeB.

S1507, when first target e-NodeB resource allocation failure, when not allowing the terminal incision, then the first target e-NodeB carries in source e-NodeB sends the response message of context transfer failure and does not allow the relevant information cut and the cause value of failure.Simultaneously, the first target e-NodeB distributes the information of failure to notify the second target e-NodeB own resource, to trigger the second target e-NodeB start-up operation.

If after S1508 the 2nd e-NodeB receives the notice of first target e-NodeB Resources allocation failure, for the context of this terminal carries out resource allocation, unless in step S1503, distributed resource.

S1509, the second target e-NodeB are after the resource allocation success, and e-NodeB returns success response to the source.

After S1510, source e-NodeB receive this success response, send out switching command to terminal, source e-NodeB can send user face data to this target e-NodeB that sends success response.

After S1511, terminal are received this switching command, begin to carry out and switch, break away from the cell-of-origin, be synchronized to target e-NodeB.

If the S1512 terminal synchronizes is to target e-NodeB failure, promptly terminal has been got back to source e-NodeB, terminal notification source e-NodeB handoff failure, and the failure cause of announcement.

If S1513 source e-NodeB determines current other target e-NodeB of also having, as the second target e-NodeB, be this terminal distribution resource success, then can directly begin to send user face data to the second target e-NodeB.Whether current here, also have other target e-NodeB successfully can judge according to whether receiving the success response message that respective objects e-NodeB returns for this terminal distribution resource.

If S1514 source e-NodeB knows that from step S1512 it is that network causes that handoff failure gets reason, then carry out handover decisions again, determine new target e-NodeB for terminal, at this moment needing to get rid of according to terminal handoff failure reason may out of order e-NodeB.There had been other target e-NodeB to keep context between the preparatory stage if switched last time, and then notified this target e-NodeB to do immediately and switch preparation.Such as: can be that source e-NodeB sends the terminal context to the 3rd target e-NodeB, after the 3rd target e-NodeB receives this context, judge whether self has been this context Resources allocation success, if success, then carry out to source e-NodeB and send success response, otherwise, carry out resource allocation after, send success response to source e-NodeB again.

S1515, determine new target e-NodeB at network side, i.e. the 3rd target e-NodeB, after the successful Resources allocation, source e-NodeB notifies the resource allocation information of terminal the 3rd Target cell immediately, so that terminal inserts.

S1516, source e-NodeB send user face data to the 3rd target e-NodeB.

S1517, follow-up hand-off process comprise: the path switching of aGW and the resource release of source e-NodeB etc.Exist a plurality of target e-NodeB to receive context between the preparatory stage even distributed switchable resource if switch, need the treatment mechanism of deletion, such as: target e-NodeB can trigger the timer of self by the signaling from source e-NodeB, and timer expiry automatically deletion be the resource of this context distribution.

From the foregoing description 3 as can be seen, Target cell is the execution sequence that switching terminal carries out resource allocation: when the highest target e-NodeB resource allocation of priority is failed, should be rapidly to source e-NodeB and second target e-NodeB report, the second target e-NodeB begins to receive that based on the front context carries out resource allocation simultaneously, if success, then return the response of context transfer success, if failure then continues to notify the 3rd target e-NodeB to source e-NodeB.

Generally speaking, there is interface between the target e-NodeB each other.But also may there be the situation that does not have interface each other, at this situation, need the first target e-NodeB when source e-NodeB returns access failure, source e-NodeB reinforms the second target e-NodeB and continues to do the switching preparation, unless the second target e-NodeB has distributed resource simultaneously.In addition, the first target e-NodeB can do double optimization according to the RRM information of self and calculate, and draws corrected target e-NodeB tabulation, then source e-NodeB is issued in this tabulation, does subsequent operation again by source e-NodeB.

If run into extreme case, promptly the e-NodeB several objects sub-district of sending in source does not all return success response.At this moment, run into resource situation extremely in short supply on every side probably.In this case, source e-NodeB need recomputate next group switching target e-NodeB, re-executes handoff procedure of the present invention, also can be to RRM server report present case.Further, RRM Server can make some optimization processes according to the resource situation of each e-NodeB of its control, accesses such as the Radio Resource with relative idle district, offers the sub-district of resource scarcity; The terminal of perhaps managing in the sub-district that load is heavy is transferred to the light sub-district of load.

Receive the response message of resource allocation success as source e-NodeB after, beginning is sent out switching command to terminal, carry the wireless resource configuration that target e-NodeB is a terminal distribution in the order, if terminal is carried out handoff failure, promptly be synchronized to the Target cell failure, get back to the original sub-district among the e-NodeB of source possibly, at this moment except the handoff failure that causes owing to some terminal faults itself, source e-NodeB has two kinds to select possibility:

First kind of situation: source e-NodeB sends out handoff request based on switching target e-NodeB tabulation to the sub-district of other succeeding target e-NodeB except that the target e-NodeB of handoff failure, waits for the response message of target e-NodeB resource allocation success.

Second kind of situation: if a plurality of target e-NodeB resource that has been terminal distribution has been arranged, at this moment source e-NodeB can be directly according to priority, select the target e-NodeB of limit priority, and to carry this target e-NodeB be the information of terminal handover configurations, and command terminal switches to follow-up sub-district once more.Obviously like this, save time than first kind of situation.

Target e-NodeB to the contextual deletion of switching terminal and the release of Resources allocation three kinds of modes are arranged:

1, before terminal carry out to be switched, after source e-NodeB received the message that certain target e-NodeB is allocated successfully for this terminal resource, e-NodeB sent out deletion, release message to other target.

2, after terminal is carried out switching, after source e-NodeB receives that terminal has switched to the information of target e-NodeB, behind the handoff completion message that the switching of being sent by target e-NodeB is finished or aGW sends, e-NodeB sends out deletion, release message to other target.This benefit is: when the terminal handoff failure returns source e-NodeB, if sent out handoff request to a plurality of target e-NodeB before the e-NodeB of source, also received success response respectively, then source e-NodeB can issue the order that switches to another one target e-NodeB to terminal rapidly, wherein with the information such as RB reprovision that go up this target e-NodeB, handover delay when like this, terminal appearance switching is unusual can significantly reduce.

3, after target e-NodeB preserves context or has distributed resource, the opening timing device, timer expiry is then deleted the context of terminal and the resource that may distribute.The timer expiry time can be that calculation of parameter obtains by the sequence number in this target e-NodeB place switching target e-NodeB tabulation, and is perhaps given by source e-NodeB.

The value of this timer will be considered following 2 points:

1, after the high target e-NodeB of priority distributed failure, the context in this sub-district still existed, and can continue to handle;

2, when terminal is carried out handoff failure, can change the sub-district of alternative inferior priority rapidly over to, and the context of this sub-district or the resource of having distributed exist still.

For target e-NodeB, adopt above-mentioned which kind of mode to determine time-out time, mainly decide by priority or its resource situation of changing the Target cell of priority of terminal.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (36)

1, a kind of changing method, terminal provides access service by first network element, it is characterized in that, may further comprise the steps:

A, selection first destination switch net element are as destination switch net element;

B, send the terminal handoff request, carry alternative target switch net element information in the described terminal handoff request to first destination switch net element;

If C first destination switch net element allows the terminal incision, then described terminal incision is to first destination switch net element, otherwise first destination switch net element is forwarded to the alternative target switch net element with described terminal handoff request, and terminal is switched to the alternative target switch net element.

2, the method for claim 1 is characterized in that, in the described steps A, described first network element is selected first destination switch net element and/or alternative target switch net element according to the measurement report that terminal sends.

3, method as claimed in claim 2 is characterized in that, in the described steps A, described first network element also carries out handover decisions according to the minizone wireless resource management information that obtains.

4, method as claimed in claim 3 is characterized in that, in the described steps A, described minizone wireless resource management information obtains one of in the following way:

From resource management server, obtain, or

From adjacent destination switch net element, obtain, or

Send the self-defining signaling message to described first network element from described resource management server or adjacent destination switch net element and to obtain.

According to claim 3 or 4 described methods, it is characterized in that 5, described minizone wireless resource management information comprises neighbor cell load and area interference information.

6, the method for claim 1 is characterized in that, among the described step B, described alternative target switch net element is a plurality of.

7, method as claimed in claim 6 is characterized in that, described a plurality of alternative target switch net element have priority.

8, method as claimed in claim 7 is characterized in that, in the described terminal handoff request, carries a plurality of alternative target switch net element tabulations, carries precedence information in the described tabulation.

9, method as claimed in claim 8, it is characterized in that, among the described step C, if described first destination switch net element does not allow described terminal incision, then select the first alternative target switch net element according to described priority orders, and described terminal handoff request is forwarded to the described first alternative target switch net element by described first destination switch net element.

10, method as claimed in claim 9, it is characterized in that, among the described step C,, then described terminal handoff request is forwarded to the second alternative target switch net element by the first alternative target switch net element if the described first alternative target switch net element does not allow described terminal incision.

11, as claim 7 or 8 described methods, it is characterized in that, among the described step C,, then described terminal handoff request is forwarded to a plurality of alternative target switch net element by described first destination switch net element if described first destination switch net element does not allow described terminal incision.

12, method as claimed in claim 11 is characterized in that, among the described step C, described a plurality of alternative target switch net element are switched preparation according to described precedence information.

13, method as claimed in claim 12 is characterized in that, among the described step C, described a plurality of alternative target switch net element are switched preparation according to described precedence information, further comprise:

The alternative target switch net element of first priority is carried out parsing, preservation, the reservation of terminal handoff request and is distributed respective resources; And/or

The alternative target switch net element of second priority is carried out parsing, the preservation of terminal handoff request.

14, method as claimed in claim 13 is characterized in that, also comprises the step of alternative target switch net element deletion terminal handoff request and/or release resource.

15, method as claimed in claim 14 is characterized in that, described alternative target switch net element deletion terminal handoff request and/or release resource adopt following method:

After the switching that first network element receives certain alternative target switch net element is ready to complete message, send deletion/release message to other alternative target switch net element, or

First network element receives after terminal switches to certain alternative target switch net element, sends deletion/release message to other alternative target switch net element, or

The time threshold of deletion terminal handoff request is set, reach described time threshold after, send deletion/release message to other alternative target switch net element.

16, method as claimed in claim 11 is characterized in that, among the described step C, in described a plurality of alternative target switch net element, chooses at first and carries out the terminal switching to the alternative target switch net element of first network element transmission terminal switching request response.

17, method as claimed in claim 11 is characterized in that, among the described step C, if described first network element is not received the terminal switching request response of alternative target switch net element in very first time threshold value, then initiates switching flow again.

18, as claim 7 or 8 described methods, it is characterized in that, among the described step C, comprise that also first destination switch net element carries out the step of prioritization again to described a plurality of alternative target switch net element.

19, the method for claim 1 is characterized in that, described terminal handoff request is by context transfer message context transfer or handoff request message handover request carrying.

20, the method for claim 1 is characterized in that, among the described step C, described terminal handoff request is transmitted by IAD.

21, the method for claim 1 is characterized in that,

Described first network element can be an evolution base station, also can be the control unit of evolution base station, and/or

Described first destination switch net element and/or alternative target switch net element can be evolution base stations, also can be the control units of evolution base station.

22, a kind of handover network comprises first network element and first destination switch net element, it is characterized in that, also comprises:

Terminal handoff request transmitting element is positioned at first network element, is used for sending the terminal handoff request to first destination switch net element;

Alternative target switch control unit information setting unit is positioned at first network element, is used in described terminal handoff request information alternative target switch control unit information being set;

Terminal handoff request retransmission unit is positioned at first destination switch net element, is used for transmitting described terminal handoff request to the alternative target switch control unit.

23, network as claimed in claim 22 is characterized in that, also comprises:

The first prioritization unit is positioned at first network element, is used for a plurality of alternative target switch control units are carried out prioritization.

24, network as claimed in claim 22 is characterized in that, also comprises:

The second prioritization unit is positioned at first destination switch net element, is used for a plurality of alternative target switch control units are carried out prioritization again.

25, as claim 22,23 or 24 described networks, it is characterized in that, also comprise:

Counter unit is used to set the terminal switching request response time threshold of alternative target switch control unit.

26, a kind of changing method, terminal provides access service by first network element, may further comprise the steps:

A, at least two destination switch net element of selection;

B, first network element send the terminal handoff request to described destination switch net element, carry the precedence information of described destination switch net element in the described request;

C, according to described precedence information, carry out the terminal handover operation.

27, method as claimed in claim 26 is characterized in that, among the described step C, described destination switch net element also comprises the step of switching preparation according to described precedence information after receiving described terminal handoff request message.

28, method as claimed in claim 27 is characterized in that, described destination switch net element is switched preparation, further comprises:

The destination switch net element of first priority is carried out parsing, preservation, the reservation of terminal handoff request and is distributed respective resources; And/or

The destination switch net element of second priority is carried out parsing, the preservation of terminal handoff request.

29, method as claimed in claim 28 is characterized in that, also comprises the step of destination switch net element deletion terminal handoff request and/or release resource.

30, method as claimed in claim 29 is characterized in that, described destination switch net element deletion terminal handoff request and/or release resource adopt following method:

After the switching that first network element receives certain destination switch net element is ready to complete message, send deletion/release message to other destination switch net element, or

First network element receives after terminal switches to certain destination switch net element, sends deletion/release message to other destination switch net element, or

The time threshold of deletion terminal handoff request is set, reach described time threshold after, send deletion/release message to destination switch net element.

31, method as claimed in claim 30 is characterized in that, among the described step C, if described first network element is not received the terminal switching request response of destination switch net element in very first time threshold value, then initiates switching flow again.

32, method as claimed in claim 26 is characterized in that, among the described step C, in described a plurality of destination switch net element, chooses at first and carries out the terminal switching to the destination switch net element of first network element transmission terminal switching request response.

33, method as claimed in claim 26 is characterized in that,

Described first network element can be an evolution base station, also can be the control unit of evolution base station, and/or

Described destination switch net element can be an evolution base station, also can be the control unit of evolution base station.

34, a kind of handover network comprises first network element and a plurality of destination switch net element, it is characterized in that, also comprises:

Terminal handoff request transmitting element is positioned at first network element, is used for sending the terminal handoff request to destination switch net element;

Priority is provided with the unit, is used for being provided with in described terminal handoff request the precedence information of destination switch net element,

Terminal handoff request processing unit is positioned at described destination switch net element, is used for according to described terminal handoff request terminal being carried out handover operation.

35, network as claimed in claim 34 is characterized in that, also comprises:

Switch preparatory unit, be positioned at described destination switch net element, be used for switching preparation according to described precedence information.

36, network as claimed in claim 34 is characterized in that, also comprises:

Counter unit is positioned at described first network element, is used for the terminal switching request response time threshold of target setting switch control unit.

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