CN101877895B - Cell switching method and system - Google Patents

Abstract

The embodiment of the invention discloses a cell switching method and a cell switching system. The method comprises the following steps that: a radio network controller (RNC) judges that a cell needs to be switched according to a measurement report reported by user equipment (UE) and completes the reconfiguration of a wireless link of a source cell and a target cell, a source cell NodeB or target cell NodeB sends a cell switching command to the UE through a physical control channel; and the UE receives the cell switching command and finishes the switching process. The system comprises the RNC, the UE, the source cell NodeB and the target cell NodeB. The cell switching method and the cell switching system can improve the cell switching reliability and reduce the time delay of cell switching.

Description

A kind of cell switching method and system

Technical field

The present invention relates to mobile communication technology field, relate in particular to a kind of cell switching method and system.

Background technology

In mobile communication system, when using the user Cong Yige community of network service to move to another community, or due to reasons such as wireless transmission, service load quantity adjustment, activation manipulation maintenance, equipment faults, in order to guarantee the continuity of communication, system will be transferred to the communication link of this user and cell-of-origin on Xin community.Here it is " handover ", is called for short " switching ".

Switching in synchronous code division multiple access (Time Division-Synchronous Code DivisionMultiple Access, TD-SCDMA) system of time-division mainly contains the switching between the intrasystem switching of following several types: TD-SCDMA, TD-SCDMA system and other wireless access systems.The present invention improves mainly for the intrasystem changing method of TD-SCDMA.

According to the position at place, Target cell, distinguish, the intrasystem switching of TD-SCDMA is divided into again the switching of community between the lower different N ode B of switching, same radio network controller (RNC) in same base station (Node B), the switching of different RNCs Jian community.According to triggering the criterion of switching, distinguish the switching that the intrasystem switching of TD-SCDMA can be divided into the switching based on pilot frequency intensity and combine with pilot frequency intensity based on link-quality.According to hand-off execution process, divide, the intrasystem switching of TD-SCDMA can be divided into direct-cut operation and baton handover.

Direct-cut operation refers to when handover occurs user, first disconnects the contact of Yu Jiu community (being cell-of-origin), and Zai Hexin community (being Target cell) sets up the process of contact.In the process of direct-cut operation, first travelling carriage disconnects the contact of Yu Jiu community, and for example, if (disturb excessive) for some reason, travelling carriage can not be set up link connection in very fast Yu Xin community, can cause the phenomenon of call drop.

The key technology of baton handover process is up presynchronization technology, critical process is when by cell-of-origin, to Target cell, (target cell) shifts wireless link, first up link is transferred to Target cell, within a period of time, UE continues to utilize the down link between former base station and UE to communicate, set up after effective and reliable uplink communication guaranteeing UE and target BS, again down link is transferred to Target cell, and then complete baton handover process.

Switch and be generally divided into three processes: measuring process, judging process and implementation also comprise presynchronization process in baton handover process.

The major function of measuring process is that the parameter whether TD-SCDMA system is switched to institute's foundation is measured, and the result of measurement report is filtered.Measuring process in switching is mainly divided into common frequency measurement, different-frequency measure, mass measurement and the internal measurement of UE side and the special measurement of Node B side.This process is mainly concerned with cycle and the parameters configuration of measurement report.

The presynchronization process of baton handover belongs to open loop presynchronization, and in UE and network service process, UE need to measure the pilot signal strength of this cell base station and neighbor cell base station.In this process, record from the signal of each base station, adjacent cell and delay inequality from this cell base station signal simultaneously, obtain in advance the synchronization parameter with Target cell, and keep and the synchronizeing of Target cell by open loop approach.

The major function of judging process is to require the corresponding parameter of configuration according to each side such as network and business, and provides handoff decision result, the Target cell whether final decision user terminal switches and switch with reference to corresponding threshold value and measurement result.

The major function of implementation is to have adjudicated user terminal when need to carry out corresponding switching when decision process, Signalling exchange by RNC and user terminal connects user terminal and Target cell, and for user terminal distributes corresponding Radio Resource, thereby complete switching flow.

The implementation of direct-cut operation and baton handover, signaling process is basic identical, but the processing of RNC side and UE side is slightly different.Here take the flow process that between different N ode B, the direct-cut operation of community simply comes example to switch as example under same RNC once.

Fig. 1 is the method for hard switching flow chart of community between different N ode B under same RNC in prior art, and as shown in Figure 1, the method comprises:

Step 101, UE measures, and sends corresponding measurement report to RNC;

Step 102, RNC carries out cell switch determining according to this measurement report, if ruled out, need to switch, and performsstep 103.

Step 103, RNC sets up the wireless link of RNC and Target cell.

In this step, RNC sends wireless link request to Target cell Node B, and Node B receives after wireless link request, configures corresponding link circuit resource, after having configured, to RNC, sends wireless link response message.Thereby set up the wireless link of RNC and Target cell.

Step 104, RNC carries out radio link reconfiguration to Target cell Node B and cell-of-origin Node B.

Step 105, RNC notifies UE to carry out community switching by the channel of cell-of-origin to UE transmission community switching command.

In this step, community switching command is RRC signaling normally.

Step 106, UE receives after the switching command of community, does corresponding processing, resource allocation completes the foundation with the wireless link of Target cell.

Step 107, UE sends community handover success message by Target cell to RNC.

In this step, community handover success message is also RRC signaling conventionally.

Step 108, RNC receives after the handover success message of community, deletes wireless link and the Iub transmission bearer of cell-of-origin, switching completes.

In Fig. 1, community switching command is the rrc layer signaling between RNC and UE normally, sets up that (Radio Bearer Setup) message, radio bearer are reshuffled (Radio BearerReconfiguration) message, transmission channel is reshuffled (Transport Channel Reconfiguration) message or Physical Channel Reconfiguration message etc. such as: radio bearer.Community handover success message is also RRC signaling conventionally, has set up that (Radio Bearer Setup Complete) message, radio bearer have been reshuffled (Radio Bearer Reconfiguration Complete) message, transmission channel has reshuffled (Transport Channel Reconfiguration Complete) message or physical channel has been reshuffled (Physical Channel Reconfiguration Complete) message etc. such as: radio bearer.

In the cell switch process of current time division duplex (TDD), the measurement report that RNC reports based on user terminal (UE) carries out the judgement of community switching, sends the RRC signaling UE carried community switching command carry out community switching according to court verdict.In this process, switching command is by RRC signaling bear, and the base station by cell-of-origin is transmitted to UE's.Wherein, if there is not DPCH (DPCH) between the base station of cell-of-origin (NodeB) and UE, need to share (High Speed Physical Downlink Shared Channel, HS-PDSCH) transmission by high-speed physical downlink and carried the RRC signaling of switching command.

Yet, because the signal quality variation of cell-of-origin is now violent, signal quality declines very fast, and HS-PDSCH Initial Block Error Rate (BLER) desired value is higher, is specially 10%, therefore, by HS-PDSCH, transmit switching command reliability not high, although by repeatedly transmission merging, may still there is no correct transmission switching command, cause switching command to be lost, thereby cause handoff failure; On the other hand, by HS-PDSCH, transmit switching command, need to be first shared control channel (HS-SCCH) by high speed descending sharing channel (HS-DSCH) carry out the scheduling of resource, scheduling of resource can be introduced scheduling time delay.In addition, repeatedly retransmit and also can bring larger time delay.Handoff failure and can cause service transmission quality to decline or interrupt compared with long time delay, for example, for speech business, can cause higher cutting off rate, has reduced user's experience.

Summary of the invention

In view of this, the object of the embodiment of the present invention is to provide a kind of cell switching method and system, to improve the reliability of carrying out community switching, reduces the time delay that switch community.

For achieving the above object, the technical scheme of the embodiment of the present invention is specifically achieved in that

A cell switching method, the method comprises:

Radio network controller (RNC) according to the measurement report of reported by user equipment UE rule out need to carry out community switching and complete cell-of-origin and the radio link reconfiguration of Target cell after, source cell base station Node B or Target cell Node B send community switching command by physical control channel to UE;

UE receives described community switching command and completes cell switch process.

A community switched system, this system comprises RNC, UE, cell-of-origin Node B and Target cell Node B;

Described RNC, whether the measurement report reporting according to UE judgement needs to carry out community switching, and is ruling out the radio link reconfiguration that completes cell-of-origin and Target cell after need to carrying out community switching;

Described cell-of-origin Node B or Target cell Node B send community switching command by physical control channel to UE;

Described UE, to RNC reporting measurement reports, receives community switching command and completes handoff procedure.

As seen from the above technical solution, the present invention sends community switching command by physical control channel, because physical control channel is compared with HS-PDSCH, its transmission reliability is higher, therefore can reduce the Loss Rate of community switching command, thereby improve the reliability that switch community, sending in addition physical control channel does not need to wait for network dispatcher scheduling resource, do not need to retransmit, thereby can reduce the time delay that switch community yet.

In the present invention, because the information that physical control channel carries is limited, for carrying out community, switch necessary Target cell parameter information, can issue UE by pre-configured process, also can issue UE by existing RRC signaling message, like this, UE can complete handoff procedure according to described switching command and corresponding Target cell parameter information.

Further, when sending community switching command by Target cell Node B by physical control channel, because the communication quality of Target cell is more stable than the communication quality of cell-of-origin, therefore, can further improve the reliability of switching.

Again further, if UE after receiving community switching command to cell-of-origin Node B or Target cell Node B feeding back confirmation message, cell-of-origin Node B and Target cell Node B can determine that after receiving described acknowledge message UE has been switched to Target cell, thereby process accordingly, for example, cell-of-origin Node B stops this UE to dispatch, and Target cell Node B starts this UE to dispatch.

Cell-of-origin Node B and Target cell Node B send switching command to UE many times also can improve the probability that UE receives described switching command, thereby improves the reliability of switching.

By increase, carry the power of physical control channel of community switching command and/or the encoder bit rate that reduces described physical control channel and also can improve the reliability that switch community.Wherein, the power that increases the physical control channel carry community switching command refers to, when described physical control channel carries community switching command, its transmitting power is high when not carrying described community switching command; The encoder bit rate that reduces described physical control channel refers to, when described physical control channel carries community switching command, its encoder bit rate is low when not carrying described community switching command.

Accompanying drawing explanation

Fig. 1 is the method for hard switching flow chart of community between different N ode B under same RNC in prior art.

Fig. 2 is the method flow diagram that switch community provided by the invention.

Fig. 3 is the HS-SCCH order control channel structure chart of type A type.

Fig. 4 is the HS-SCCH order control channel structure chart of type Type B.

Fig. 5 is the E-AGCH order control channel structure chart of type2 type.

Fig. 6 is the E-AGCH control channel structure chart of type1 type.

Fig. 7 is the composition signal of community provided by the invention switched system.

Embodiment

For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.

For can be fast and carry out reliably community switching, the present invention proposes to carry community switching command with physical layer control channel.On the one hand, physical control channel is lower with respect to the encoder bit rate of Traffic Channel transmission data, for example the absolute grant channel (E-AGCH) of HS-SCCH and enhancing dedicated channel (E-DCH) all adopts 1/3 convolutional encoding, lower encoding rate can provide higher coding gain, increases transmission reliability.On the other hand, the object transmission Block Error Rate of HS-SCCH and E-AGCH, generally in 0.1% left and right, has guaranteed higher transmission reliability.In addition by physical control channel, transmitting switching command can not introduce because mixed automatic repeat request (HARQ) retransmits the extra time delay of bringing.Therefore adopt the present invention can improve the reliability of switching command and reduce its propagation delay time, thereby improve reliability and the delay performance of whole cell switch process, and improve the service transmission quality in cell switch process, reduce cutting off rate, improve user and experience.

When sending switching command by physical control channel, because the information that physical control channel carries is limited, for switching necessary Target cell parameter information, can issue UE by existing RRC signaling message, also can issue UE by pre-configured process, like this, UE can complete handoff procedure according to described switching command and corresponding Target cell parameter information.

Fig. 2 is the method flow diagram that switch community provided by the invention.In method shown in Fig. 2, first by pre-configured process, will switch necessary Target cell parameter information and issue UE, then by cell-of-origin Node B or Target cell Node B, by physical control channel, switching command is issued to UE, UE completes handoff procedure according to switching command again.

As shown in Figure 2, this first method specifically comprises:

Step 201, UE measures, and sends measurement report 1 to RNC, for triggering pre-configured process.

Step 202, RNC receives the measurement report 1 that UE sends, and according to this measurement report 1, by carrying out community, switches required Target cell parameter information and issues UE.

In this step, the measurement report 1 that RNC reports according to each UE safeguards have the neighbouring relations of each community and the information such as communication quality of each community, RNC determines according to these information the Target cell to be selected that each community is corresponding, and the parameter information of these Target cells to be selected is issued to UE.

Described parameter information comprises that RRC of the prior art reshuffles the relevant information of carrying in signaling message, information and/or physic channel information and/or ascending wireless resource information and/or the downlink radio resource information of the UE such as the Midamble code of the code channel resource that for example, the carrier frequency of Target cell, Target cell are user assignment, Target cell reception or transmitting and skew thereof.

Wherein, the information of described UE for example has: new terminal iidentification and/or the indication of RRC state.Described new terminal iidentification comprises enhancing dedicated channel Radio Network Temporary Identifier (E-RNTI), Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI), high speed descending sharing channel Radio Network Temporary Identifier (H-RNTI) etc.

Described physic channel information is such as having: frequency information, discontinuous reception (DRX) parameter, semi-continuous scheduling (SPS) parameter, multiple-input and multiple-output (MIMO) parameter etc.

Described ascending wireless resource information is such as having: maximum uplink transmit power, uplink special physical channel (DPCH) parameter, E-DCH information etc.

Described downlink radio resource information for example has: all wireless link common downlink information, each wireless link downlink information, multicast and broadcast (MBMS) relevant information etc.

Step 203, UE receives and stores described Target cell parameter information.

In this step, UE receives the parameter of each Target cell to be selected, and stores described parameter, or upgrades the relevant parameter of having stored in UE.

Bystep 201～step 203, completed the pre-configured process of Target cell parameter.

Step 204, UE measures, and sends for triggering the measurement report 2 of switch decision process to RNC.

Step 205, the measurement report 2 that RNC reports according to UE carries out cell switch determining, if ruled out, need to carry out community switching, performsstep 206.

In this step, by switch decision selected Target cell of carrying out this switching from each Target cell to be selected.

Step 206, sets up the wireless link between RNC and Target cell.

Step 207, RNC carries out radio link reconfiguration to cell-of-origin and Target cell.

Step 208, cell-of-origin Node B or Target cell Node B send community switching command by physical control channel to UE.

Physical control channel in this step can be HS-SCCH, can be also E-AGCH, specifically how by HS-SCCH and E-AGCH, to UE, to send switching command, refers to hereinafter relevant narration.

Step 209, UE receives after the switching command of described community, and according to the Target Cell Identifier receiving and pre-configured Target cell parameter configuration related resource, and foundation is connected with the wireless link of Target cell.

Step 210, UE sends community handover success message by Target cell to RNC,

Step 211, the wireless link of deleting cell-of-origin connects, and sets up communicating by letter of UE and Target cell, and so far, handoff procedure completes.

In Fig. 2, switch necessary Target cell parameter information and issue UE by pre-configured process, in practical application, can both carry out described pre-configured process, retain again in prior art and pass through RRC signaling to the step of UE transmission switching command, that is to say, after thestep 207 of method shown in Fig. 2, beforestep 209, increase step 105.In this case, switching command is handed down to UE twice, can improve the reliability that UE receives described order, thereby raising handover success rate, in addition UE can switch according to the community switching command of receiving at first, ignores an other switching command, thereby reduces handover delay.In addition, by increasingstep 105, switch required Target cell parameter information and be also handed down to UE twice, in order to reduce data distributing amount, in the RRC signaling that also can issue instep 105, only carry community and switch indication and Target Cell Identifier.

The method that Node B in cell-of-origin instep 208 or Target cell Node B is sent to switching command by physical control channel to UE below describes in detail.

Physical control channel instep 208 can be HS-SCCH, can be also E-AGCH.

In 25.222 current agreements, provided the structure of 11 kinds of HS-SCCH.Wherein having 2 kinds to be type as HS-SCCH order, is respectively the HS-SCCH order of type A type and type Type B, specifically refers to Fig. 3 and Fig. 4.

Fig. 3 is the HS-SCCH order control channel structure chart of type A type, wherein has 3 bits to represent order type, and having 22 bits is reserved places.

Fig. 4 is the HS-SCCH order control channel structure chart of type Type B, wherein has 3 bits to represent order type, and having 26 bits is reserved places.

Except the HS-SCCH of type A type and these two kinds of HS-SCCH order types of the HS-SCCH of type Type B, also have 9 kinds of HS-SCCH control channel forms, wherein also there is reserved bit.

According to the difference of HS-SCCH control channel form, the method that issues community switching command to UE by HS-SCCH can comprise:

Method 1: use current untapped value representation community in the order field in HS-SCCH order type to switch indication, or adopt reserved bit to represent community switching indication; Adopt reserved place to represent Target Cell Identifier.

At present in the HS-SCCH of type A type, 3 bits of order type field have only been used " 000 ", " 001 ", " 010 " and " 011 " four values, therefore can represent community switching indication by untapped value, for example, use " 100 " to represent community switching indication.

At present in type Type B HS-SCCH, 3 bits of order type field have only been used " 000 ", " 010 " and " 011 " three values, therefore can represent community switching indication by untapped value, for example, use " 100 " to represent community switching indication.

Or also can represent community switching command by other reserved bit in the HS-SCCH of type A type or type Type B HS-SCCH.

In addition, also need to carry Target Cell Identifier in the switching command of community, for example, in low spreading rate time division duplex (LCR TDD) system, can represent Target cell ID by the reserved bit in HS-SCCH order form.

Method 2: reuse in the HS-SCCH of HS-SCCH order type with bit and represent that community switches indication, adopt the reserved bit in HS-SCCH order form to represent Target cell ID.

Because community switching command can be sent also and can be sent by Target cell by cell-of-origin, when adopting Target cell to send switching command, can adopt the mode of method 1.Or, in order to retain the upper precious bit resource of HS-SCCH, can be reused the value of order field, represent community switching indication.

When sending the HS-SCCH of HS-SCCH order type and sending the HS-SCCH of HS-SCCH order type by Target cell by cell-of-origin, the value that wherein order field can be got is incomplete same, that is to say, some value that order field is got in the HS-SCCH of cell-of-origin transmission HS-SCCH order type, in the HS-SCCH of Target cell transmission HS-SCCH order type, in order field, can not occur at present, the present invention can redefine these values, when these values appear in the HS-SCCH that Target cell sends, represent community switching indication.For example reuse " 001 " in order type.Concrete using method is as follows:

When cell-of-origin sends the HS-SCCH of HS-SCCH order type, and order type is while being " 001 ", remains original implication, discharges the order of semi-continuous resource.

When Target cell sends the HS-SCCH of HS-SCCH order type, and order type is while be " 001 ", represents that community is switched to indicate.

Method 3: adopt the reserved bit in HS-SCCH to represent community switching indication and Target Cell Identifier.Wherein, can represent community switching indication by 1 reserved bit or a plurality of reserved bit.

In current 25.222 agreements, stipulate the E-AGCH of two types, be respectively E-AGCH type 1 and E-AGCH type2, wherein, in E-AGCH type 2, be provided with order field.

Fig. 5 is the E-AGCH order control channel structure chart of type2 type, as seen from Figure 5, is provided with the order field of 3 bits in E-AGCHtype 2order.

If system is being used the E-AGCH order of type2 type at present, can make so to carry in the following method community switching command:

Method 4: use current untapped value representation community in the order field in E-AGCH order type to switch indication, or adopt reserved bit to represent community switching indication.

In E-AGCH order, 3 bits of order field have only been used " 000 " at present.Therefore can represent community switching indication by current untapped value, for example, use " 001 " to represent community switching indication.Or also can represent by other reserved bit community switching indication.

Method 5: reuse in the E-AGCH of E-AGCH order type with bit and represent that community switches indication, adopt the reserved bit in E-AGCH order form to represent Target cell ID.

Because community switching command can be sent also and can be sent by Target cell by cell-of-origin, when adopting Target cell to send switching command, can adopt the mode of method 4.Or, in order to retain the upper precious bit resource of E-AGCH, can be reused the value of order field, represent community switching indication.

When sending the E-AGCH of E-AGCH order type and sending the E-AGCH of E-AGCH order type by Target cell by cell-of-origin, the value that wherein order field can be got is incomplete same, that is to say, some value that order field is got in the E-AGCH of cell-of-origin transmission E-AGCH order type, in the E-AGCH of Target cell transmission E-AGCH order type, in order field, can not occur at present, the present invention can redefine these values, when these values appear in the E-AGCH that Target cell sends, represent community switching indication.For example reuse " 000 " in order type.Concrete using method is as follows:

When cell-of-origin sends the E-AGCH of E-AGCH order type, and order type is while being " 000 ", remains original implication, discharges the order of semi-continuous resource.

When Target cell sends the E-AGCH of E-AGCH order type, and order type is while be " 000 ", represents that community is switched to indicate.

Method 6: adopt the reserved bit in E-AGCH type2 to represent community switching indication and Target Cell Identifier.Wherein, can represent community switching indication by 1 reserved bit or a plurality of reserved bit.

Fig. 6 is the E-AGCH control channel structure chart of type1 type.

Referring to Fig. 6, the method for the E-AGCH carrying community switching command by type 1 type comprises:

Method 7: adopt and do not have the value representation community of use to switch indication in TRRI field or CRRI field at present, in TRRI field or CRRI field, used and do not had at present the value of use to represent after the switching indication of community, each bit after this TRRI field or CRRI field can be considered as reserved place, can be for representing Target Cell Identifier.For example, TRRI field is set to " 00000 " and represents community switching indication, utilizes the bit outside TRRI field to represent Target Cell Identifier; Or, in LCR TDD system, CRRI field in the E-AGCH of type2 type has 4 bits, can represent altogether 15 index values, wherein " 1111 " are not used, therefore, can be that " 1111 " represent community switching indication by CRRI value, CRRI field in the E-AGCH of type1 type has 5 bits, can represent altogether 31 index values, and wherein " 11111 " are not used, therefore, can be that " 11111 " represent community switching indication by CRRI value, correspondingly, Target Cell Identifier adopts the reserved bit position outside CRRI field to represent.

Method 8: be the value that there is no use at present by TRRI field or CRRI field value, each bit after this TRRI field or CRRI field can be considered as reserved place, adopt the one or more bits in described reserved place to represent community switching indication, adopt remaining described reserved place to represent Target Cell Identifier.For example, the E-AGCH of corresponding E-AGCH type 1, TRRI is set to " 00000 ", n bit (n is natural number, for example n=3) is considered as order type below, and other bits after TRRI field are considered as reserved bit, use a value in order type to switch indication as community, for example n=3, is used ' 000 ' to represent community switching indication, by other reserved bit, represents Target Cell Identifier.

The improvement of this step is carried out in switching in the switching flow of the main Shi Dui of method shown in Fig. 2 community, and its main thought is to carry community switching command by physical layer control channel.Wherein, the base station of cell-of-origin or Target cell for example, need to be carried out and switch terminal according to the correlated process on Iub interface (wireless links reconfiguration course) judgement, the base station of cell-of-origin or Target cell sends community switching command by physical control channel to UE, and notice UE is switched to Target cell; UE receives after the community switching command of physical control channel carrying of cell-of-origin or Target cell, carries out and switches, and is switched to Target cell.

Although physical layer control channel adopt lower encoding rate (for example the shared control channel HS-SCCH of high speed downlink shared channel HS-DSCH and the absolute grant channel (E-AGCH) that strengthens dedicated channel E-DCH are all adopted 1/3 convolutional encoding) and object transmission Block Error Rate lower, thereby the reliability of comparing traditional switching Lai Jiang community, community switching command has obtained certain guarantee, has also reduced certain propagation delay time.Yet there is certain error probability in physical layer control channel after all.And when meeting community switching condition, the signal quality of cell-of-origin is poor, may not guarantee object transmission Block Error Rate, causes physical control channel error of transmission.Thereby cause community switching command to be lost, handoff failure.In order further to improve the reliability that adopts physical layer control signal transmission community switching command, the present invention also provides corresponding safeguard measure, thereby further guarantees the reliability that switch community, reduces cutting off rate, improves user and experiences.

When the present invention provides safeguard measure for physical layer control signal transmission community switching command, in base station side and UE side, increase respectively corresponding frequency converter measure, and guarantee base station side and UE side cognitive consonance, to complete handoff procedure, particularly, comprising:

Step 1: the base station of cell-of-origin or Target cell for example, need to be carried out and switch terminal according to the correlated process on Iub interface (wireless links reconfiguration course) judgement; the base station of cell-of-origin or Target cell sends community switching command by physical control channel to terminal; notification terminal is switched to Target cell, carries out the frequency converter measure of base station side in sending community switching command process.

Step 2: terminal receives after the community switching command of physical control channel carrying of cell-of-origin or Target cell, carries out the frequency converter measure of end side, carries out and switches, and is switched to Target cell.

Described frequency converter measure can be the one or any combination of following scheme:

The first method: increase the feedback acknowledgment to community switching command.

In the first method, after is reshuffling Target cell or cell-of-origin, the Node B of Target cell or cell-of-origin sends community switching command to UE, and UE receives that switching command backward Node B feedback in community is corresponding and confirms.After feedback acknowledgment, UE just carries out resource reconfiguration and is switched to Target cell.The Node B of Target cell or cell-of-origin just thinks that UE is switched to Target cell after correctly receiving UE community switching command feedback, and processes accordingly, and for example Node B in cell-of-origin stops dispatching this UE, and Target cell Node B starts to dispatch this UE.

Visible, in the first method, the frequency converter measure of UE side is: UE receives that the Node B of the backward Target cell of community switching command or cell-of-origin feeds back corresponding community switching command and confirms.After feedback acknowledgment, UE just carries out resource reconfiguration and is switched to Target cell.That is to say, between thestep 208 of method shown in Fig. 2 and step 209, increase UE and to cell-of-origin Node B or Target cell Node B feedback, received the acknowledge message of community switching command.The frequency converter measure of base station side is: correctly receive UE community switching command feedback acknowledgment and think that UE is switched to Target cell, process accordingly base station afterwards.

Wherein, the method for UE feeding back confirmation message can be one or more of following mode:

Mode one, UE is by shared information channel (Shared InformationChannel for HS-DSCH, HS-SICH) the feedback acknowledgment information of high speed descending sharing channel.

When the control channel of carrying community switching command is HS-SCCH, can carry out feedback acknowledgment by HS-SICH.Described confirmation can be that the particular value on HS-SICH represents, these particular values do not have specific physical meaning at present, and therefore, the present invention utilizes these particular values to represent that UE has received community switching command.Recommendation transmission block on HS-SICH size (RTBS) is for example set is 0 and represent that UE correctly receives community switching command, or it is 0 that RTBS is set, and the feedback information of mixing repetitive requests HARQ is that confirmation ACK represents that UE correctly receives community switching command.When the control channel of carrying community switching command is E-AGCH, also can carrys out feedback acknowledgment with HS-SICH, but need to redefine the timing relationship between a kind of E-AGCH and HS-SICH.

Mode two, UE is by E-DCH absolute grant channel (E-DCH Absolute Grant Channel, E-RUCCH) or E-DCH physical uplink channel (E-DCH Physical Uplink Channel, E-PUCH) feedback acknowledgment information.

In which two, UE can carry schedule information (Schedule Information on E-RUCCH or E-PUCH, SI), by increase by 1 bit in existing SI, or the one or more territories in SI are set to the confirmation that particular value represents UE feedback, for example, by total cache occupation amount (the Total E-DCH Buffer Status of E-DCH in SI, TEBS) territory is set to 0, and by the cache occupation amount of highest priority logical channel (Highest priority Logical channelBuffer Status, HLBS) territory is set to the non-zero acknowledge message that represents.

In order to improve the reliability of feeding back confirmation message, when by E-PUCH feeding back confirmation message, can also adopt HARQ to retransmit acknowledge message.

In addition, in order further to improve the reliability of feeding back confirmation message, can improve the transmitting power of the channel of carrying acknowledge message, for example, improve the transmitting power of HS-SICH, E-RUCCH or E-PUCH.

The second method: network side repeatedly repeats to send community switching command.

In this second method, can send community switching command many times by cell-of-origin Node B, or send community switching command many times by Target cell Node B, or all send community switching command by cell-of-origin Node B and Target cell Node B.

There is simulation result to show, under the scene of switching in community, although the signal quality of cell-of-origin declines violent, cell-of-origin Node B repeats multiplely to send HS-SCCH can guarantee HS-SCCH several times transmission error probability below 0.2%, and this error probability is acceptable.Therefore in order to improve the reliability of community switching command, can repeatedly send community switching command.The number of times that repeats to send community switching command can be undertaken pre-configured or is set as preset parameter by high level.

Visible, in this second method, the frequency converter measure of base station side: repeatedly send community switching command; The frequency converter measure of UE side: UE correctly receives that at least one times after the switching command of community, UE carries out resource reconfiguration and is switched to Target cell.

In addition, can also carry the transmitting power of physical control channel of community switching command and/or the reliability that the encoder bit rate that reduces described physical control channel improves transmission community switching command by raising.

Fig. 7 is the composition schematic diagram of community provided by the invention switched system, and as shown in Figure 7, this system comprises RNC701, UE702, cell-of-origin Node B703 and Target cell Node B704.

RNC701, whether the measurement report reporting according to UE702 judgement needs to switch, and is ruling out the radio link reconfiguration that completes Target cell wireless link and cell-of-origin and Target cell after need to switching.

Cell-of-origin Node B703 or Target cell Node B704 send community switching command by physical control channel to UE702.

UE702, to RNC701 reporting measurement reports, receives community switching command and completes cell switch process.

UE702 comprises to RNC701 reporting measurement reports: UE702 first reports for triggering the measurement report of the pre-configured process in Target cell to RNC701, then reports the measurement report for triggering cell switch decision to RNC701; Receive and store the Target cell parameter information that RNC701 issues.

Correspondingly, RNC701 receives for triggering the measurement report of the pre-configured process in Target cell, issues the parameter information of Target cell according to this measurement report to UE702; Receive the measurement report for triggering cell switch decision, according to this measurement report, carry out switch decision.

Described physical control channel comprises HS-SCCH and/or E-AGCH.

UE702 also can be further used for, and receives feeding back confirmation message after the switching command of described community.

Wherein, UE702 can pass through HS-SICH or E-RUCCH or E-PUCH feeding back confirmation message.

Cell-of-origin Node B703 or Target cell Node B704 send more than twice or twice community switching command by physical control channel to UE.

Can also increase carrying community switching command physical control channel transmitting power and/or reduce the encoder bit rate of described physical control channel.

RNC701 also can be further used for, and completes after the radio link reconfiguration of cell-of-origin and Target cell, by RRC signaling message, to UE702, sends community switching command.

The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention, all any modifications of making within the spirit and principles in the present invention, is equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (15)

1. a cell switching method, is characterized in that, the method comprises:

Radio network controller (RNC) according to the measurement report of reported by user equipment UE rule out need to carry out community switching and complete cell-of-origin and the radio link reconfiguration of Target cell after, source cell base station Node B sends community switching command by physical control channel to UE;

UE receives described community switching command and completes cell switch process;

Wherein, the measurement report that described RNC reports according to UE rules out and need to carry out community switching and complete cell-of-origin and the radio link reconfiguration of Target cell comprises:

UE reports for triggering the measurement report of the pre-configured process in Target cell to RNC, and RNC carries out the pre-configured process in Target cell according to this measurement report, by this pre-configured process, issues the parameter information of Target cell to UE, and UE receives and store described parameter information;

UE reports the measurement report for triggering cell switch decision to RNC, RNC carries out cell switch determining according to this measurement report, need to carry out, after the switching of community, completing the radio link reconfiguration of Target cell wireless link and cell-of-origin and Target cell ruling out.

2. the method for claim 1, is characterized in that, the parameter information of described Target cell comprises information and/or physic channel information and/or ascending wireless resource information and/or the downlink radio resource information of UE.

3. the method for claim 1, is characterized in that, described physical control channel comprises the shared control channel HS-SCCH of high speed descending sharing channel and/or strengthens the absolute grant channel E-AGCH of dedicated channel E-DCH.

4. method as claimed in claim 3, is characterized in that, described community switching command comprises community switching indication and Target Cell Identifier;

If described physical control channel is HS-SCCH, describedly by physical control channel, to UE, sends community switching command and comprise:

Adopt current untapped order value in HS-SCCH order order type to represent community switching indication;

Or, use the reserved place in HS-SCCH to represent community switching indication;

And, adopt the reserved place in HS-SCCH to represent Target Cell Identifier;

If described physical control channel is E-AGCH, describedly by physical control channel, to UE, sends community switching command and comprise:

If that current employing is the E-AGCH of first kind type1, adopt in type1E-AGCH in time interval resource relevant information TRRI field or code channel resource relevant information CRRI field current untapped value to represent that community switches indication; Or when described TRRI field or CRRI field are taken as to current untapped value, each bit outside TRRI field or CRRI field is as reserved place, adopt described reserved place to represent that community switches indication; Or the current value implication of power resource relevant information PRRI field is redefined as switching indication in community; Or on current E-AGCH basis, increase and be specifically designed to the bit that represents community switching indication;

If that current employing is the E-AGCH of Second Type type2, adopt current untapped order value in type2E-AGCH to represent community switching indication;

Or, use the reserved place in type2E-AGCH to represent community switching indication;

And, adopt the reserved place in E-AGCH to represent Target Cell Identifier.

5. the method for claim 1, is characterized in that, described by physical control channel after UE sends community switching command, the method further comprises:

UE receives feeding back confirmation message after the switching command of described community, and then UE is switched to Target cell again, and cell-of-origin Node B determines that UE is switched to Target cell after receiving described acknowledge message.

6. method as claimed in claim 5, is characterized in that, described feeding back confirmation message comprises:

Shared information channel HS-SICH or E-DCH by high speed descending sharing channel access ascending control channel E-RUCCH or E-DCH physical uplink channel E-PUCH feeding back confirmation message at random.

7. method as claimed in claim 6, is characterized in that,

If by HS-SICH feeding back confirmation message, when the recommendation transmission block in HS-SICH size RTBS field value is 0, represent that UE receives described community switching command, or the RTBS field value in HS-SICH be 0 and the feedback information of HARQ represent that UE receives described community switching command while being response message ACK;

If by E-RUCCH or E-PUCH feeding back confirmation message, increase bit in the schedule information SI carrying and carry acknowledge message in this E-RUCCH or E-PUCH, or adopt current untapped value representation acknowledge message in SI.

8. the method for claim 1, is characterized in that, described cell-of-origin Node B sends community switching command by physical control channel to UE and comprises:

Cell-of-origin Node B sends more than twice or twice community switching command by physical control channel to UE.

9. method as claimed in claim 3, is characterized in that, the method further comprises:

Increase carrying community switching command physical control channel transmitting power and/or reduce the encoder bit rate of described physical control channel.

10.Yi Zhong community switched system, is characterized in that, this system comprises RNC, UE, cell-of-origin Node B and Target cell Node B;

Described RNC, whether the measurement report reporting according to UE judgement needs to carry out community switching, and is ruling out the radio link reconfiguration that completes Target cell wireless link and cell-of-origin and Target cell after need to carrying out community switching;

Described cell-of-origin Node B sends community switching command by physical control channel to UE;

Described UE, to RNC reporting measurement reports, receives community switching command and completes handoff procedure;

Wherein, described UE comprises to RNC reporting measurement reports: UE first reports for triggering the measurement report of the pre-configured process in Target cell to RNC, then reports the measurement report for triggering cell switch decision to RNC; Receive and store the Target cell parameter information that RNC issues;

Described RNC, receives for triggering the measurement report of the pre-configured process in Target cell, issues the parameter information of Target cell according to this measurement report to UE; Receive the measurement report for triggering cell switch decision, according to this measurement report, carry out switch decision, need to carry out, after the switching of community, completing the radio link reconfiguration of Target cell wireless link and cell-of-origin and Target cell ruling out.

11. systems as claimed in claim 10, is characterized in that,

Described physical control channel comprises HS-SCCH and/or E-AGCH.

12. systems as claimed in claim 10, is characterized in that,

Described UE is further used for, and receives feeding back confirmation message after the switching command of described community.

13. systems as claimed in claim 12, is characterized in that,

Described UE is by HS-SICH or E-RUCCH or E-PUCH feeding back confirmation message.

14. systems as claimed in claim 10, is characterized in that,

Cell-of-origin Node B sends more than twice or twice community switching command by physical control channel to UE.

15. systems as claimed in claim 10, is characterized in that,

Increase carrying community switching command physical control channel transmitting power and/or reduce the encoder bit rate of described physical control channel.

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