CN101466127B - District switching method capable of improving switching success rate - Google Patents
District switching method capable of improving switching success rate Download PDFInfo
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Abstract
The invention discloses a subdistrict switching method which can improve the switching success ratio, wherein, when a service basic station transmits a switching command to a switching user, a switching target basic station can also transmit the switching command to the same switching user; when a user terminal feedbacks switching confirmation information, the service basic station and the target basic station both detect the information. The method can effectively improves the success ratio that the switching command information is received by the user terminal by the technology that the service basic station and the target basic station can both transmit the switching command information to the user terminal; in addition, the switching confirmation information fed back by the user terminal can be detected by both the service basic station and the target basic station, so as to avoid the re-establishing of the radio resource control (RRC) connection as the user terminal does not receive the switching command information or the target basic station does not receive the switching confirmation information, thus reducing the time lapse of a user terminal control plane and improving the switching success ratio.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of cell switching method, relate in particular to a kind of cell switching method that improves handover success rate.
Background technology
In wireless communication system, because the user has mobility, system will support the switching of user between different base stations.Insert in (WCDMA) system in Wideband Code Division Multiple Access (WCDMA), a key technology of introducing is exactly a soft handover.The signal quality of the Common Pilot Channel of user terminal measurement adjacent cell (CPICH) is set up and is safeguarded a dedicated channel (DCH) Active Set according to measurement result, keeps soft handover with the sub-district in dedicated channel (DCH) Active Set and is connected, the maintenance transfer of data.Sub-district in the Active Set can belong to same base station also can belong to different base stations.Can only carry out the direct-cut operation of different base station minizone compares with the global system for mobile communications (GSM) in the second generation mobile communication system, soft handover has improved the data smoothing transmission of user in the different base station minizone, make that professional service quality is relatively good, be not easy to cause loss of data.
What the switching in third generation partner program Long Term Evolution (3GPP LTE) system was adopted is the technology of quick direct-cut operation.That is to say that after user terminal receives switching command from serving BS, disconnect and being connected of serving BS, beginning and target BS insert.In quick direct-cut operation, switching command message is only sent by serving BS, and switch acknowledgment message can only be received by target BS.The present invention is directed to present third generation partner program Long Term Evolution (3GPP LTE) fast in the hard-switching technology switching command message and the insecure defective of switch acknowledgment message improve.
[" 3GPPTR 36.300, " Evolved Universal Terrestrial Radio Access (E-UTRA) referring to list of references one in third generation partner program Long Term Evolution (3GPP LTE) standard criterion TR36.300; Overall description "; 2008. "], as follows about the signaling procedure that the switching between the base station is prepared: as shown in Figure 1, the measurement report that sends according to user terminal when serving BS; make and switch decision, send handoff request by X2 interface to target BS simultaneously.Set up if the evolved packet system of destination end (EPS) carries successfully, target BS is dealt into serving BS to the information of eating dishes without rice or wine to be correlated with by X2 interface, and serving BS sends switching command to user terminal by Radio Resource control (RRC) signaling again.
In the switching preparation process between above-mentioned base station, switching command message all sends to user terminal by serving BS by Radio Resource control (RRC) message.At this moment, user terminal is in the cell edge of serving BS, the downlink quality of user terminal and serving BS is very unreliable, the likelihood ratio that user terminal can not detect the switching command that the serving BS down link sends is bigger, in case switching command detects unsuccessful, user terminal might select a base station insert [referring to list of references two " 3GPP TR 36.331, " Evolved Universal Terrestrial Radio Access (E-UTRA); Radio ResourceControl (RRC)) ", 2008. "], if this base station does not store the context of this user terminal, this user's radio resource control (RRC) connection can be released, and rebulids new unlimited resources control (RRC) connection; Finally, the chain of command time delay of this user terminal probably can not satisfy the requirement of third generation partner program Long Term Evolution (3GPP LTE).
[" 3GPPTR 36.300, " Evolved Universal Terrestrial Radio Access (E-UTRA) referring to list of references one in third generation partner program Long Term Evolution (3GPP LTE) standard criterion TR36.300; Overall description ", 2008. "], as follows about the signaling procedure that the switching between the base station is confirmed:
As shown in Figure 2, after user terminal is received switching command message, carry out synchronizing process, be synchronized to target BS, and start the up timing advance of acquisition.Target BS comprises the information of notice switching user terminal uplink assignment information and timing advance to responding synchronously.After user terminal successfully is linked into target BS, send switch acknowledgment message to target BS, the handoff procedure of indicating user terminal is finished.If target BS can not correctly receive the switch acknowledgment message that user terminal is sent, so user terminal carry out the RRC process of reconstruction [referring to list of references two " 3GPP TR 36.331, " Evolved Universal TerrestrialRadio Access (E-UTRA); Radio Resource Control (RRC)) ", can increase the time delay of user terminal chain of command so greatly; 2008. "], and the process that might carry out the sub-district gravity treatment, if the sub-district of selecting this user's context relation not; then RRC process of reconstruction failure.
Summary of the invention
Technical problem to be solved by this invention is: a kind of cell switching method that improves handover success rate is provided, can reduces the delay of user's chain of command, accelerate the time of user's successful switch.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of cell switching method that improves handover success rate, described method comprises the switching set-up procedure, comprising: A1, serving BS are made and are switched decision, then send handoff request message by X2 interface to target BS; Whether A2, the decision of described target BS agree handoff request, if agree, target BS sends switch acknowledgment message to described serving BS by X2 interface; A3, described serving BS and target BS consult to send the employed resource information of switching command; Whether A4, described serving BS send the indication of handover information by the downlink resource assignment information of Physical Downlink Control Channel (PDCCH) informing user terminal about switching command message comprising target BS; A5, described serving BS and target BS send switching command message to described same user terminal on same Resource Block; Described method comprises switches the affirmation process, and comprising: B1, described user terminal insert by Random Access Channel and target BS; B2, described target BS and service base station negotiate receive the ascending resource position of switch acknowledgment message; B3, described target BS distribute ascending resource to give user terminal by Physical Downlink Control Channel (PDCCH), and informing user terminal time adjustment information; B4, described user terminal send by Physical Uplink Shared Channel (PUSCH) and switch confirmation; B5, described serving BS are forwarded to target BS the switching confirmation demodulation of receiving or after decoding, and target BS merges processing when receiving.
As a preferred embodiment of the present invention, in the described steps A 3, employed resource is the descending resource information that is used to send switching command message that described serving BS distributes; After described target BS obtains the descending assignment information and switching command message content about switching command message of serving BS, distribute the downlink resource identical to be used for transmitting switching command message with serving BS; The content of described negotiation comprises the descending resource information that is used to send switching command message of distribution, and its negotiations process can send in the handoff request message of target BS and the switch acknowledgment message that target BS sends to serving BS at serving BS and finish.
As a preferred embodiment of the present invention, in the described steps A 3, the resource location of the descending transmission switching command message that serving BS and target BS are consulted does not conflict with the position of described serving BS and target BS descending pilot frequency; The resource of the descending transmission switching command message that serving BS and target BS are consulted is not conflicted with the control channel and the position of broadcast channel of described serving BS and target BS.
As a preferred embodiment of the present invention, in the described steps A 3, when if the resource location of the descending transmission switching command message that serving BS distributes conflicts with the control channel position of target BS and descending pilot frequency position, target BS can select not send switching command message, and the notification service base station.
As a preferred embodiment of the present invention, among the described step B2, employed resource is the up resource information that is used to receive switch acknowledgment message that described target BS distributes; Described serving BS distributes corresponding ascending resource to be used for receiving switch acknowledgment message after obtaining the uplink assignment information about switch acknowledgment message of target BS.Described target BS and service base station negotiate are during about the uplink assignment resource of switch acknowledgment message, when if the resource location of the up transmission switch acknowledgment message that target BS distributes conflicts with the ascending control channel of serving BS or ascending pilot frequency position, serving BS can select not distribute corresponding ascending resource to be used for receiving the switch acknowledgment message of user terminal feedback.
As a preferred embodiment of the present invention, in the steps A 2, described target BS determines whether to agree handoff request according to admission control algorithm, if agree, target BS sends switch acknowledgment message to described serving BS.
As a preferred embodiment of the present invention, before described switching set-up procedure, also comprise measuring process, comprising:
01, the measuring process of serving BS configure user terminal;
02, serving BS informing user terminal ascending resource assignment information;
03, user terminal is reported to serving BS to measurement report.
As a preferred embodiment of the present invention, among the step B1, after user terminal is received switching command message, carry out synchronizing process, be synchronized to target BS.
A kind of cell switching method that improves handover success rate, described method comprises the switching set-up procedure, specifically comprises:
A1, serving BS are made and are switched decision, then send handoff request message to target BS;
Whether A2, the decision of described target BS agree handoff request, if agree, target BS sends switch acknowledgment message to described serving BS;
A3, described serving BS and target BS consult to send the employed resource information of switching command;
The downlink resource assignment information of A4, described serving BS informing user terminal switching command;
A5, described serving BS and target BS send switching command to described same user terminal on same Resource Block.
A kind of cell switching method that improves handover success rate, described method comprise switching affirmation process, specifically comprise:
B1, described user terminal insert by Random Access Channel and target BS;
The resource of B2, described target BS and service base station negotiate switch acknowledgment message;
B3, described target BS distribute ascending resource to give user terminal, and informing user terminal time adjustment information;
B4, described user terminal send and switch confirmation to serving BS and target BS;
B5, described serving BS are forwarded to target BS the switching confirmation demodulation of receiving or after decoding, and target BS merges processing when receiving.
Beneficial effect of the present invention is: the present invention sends the technology of switching command message to user terminal by serving BS and target BS, has improved the success rate that switching command message is received by user terminal effectively; In addition, the present invention detects the switch acknowledgment message of user terminal feedback by serving BS and target BS, and then avoided user terminal not receive rebuliding that switch acknowledgment message carries out that Radio Resource control (RRC) connects because of receiving switching command message or target BS, reduce the time delay of user terminal chain of command, improved success rate for switching.
Description of drawings
Fig. 1 is the switching preparation process figure between the base station among the 3GPP LTE.
Fig. 2 is that flow chart is confirmed in the switching between the base station among the 3GPP LTE.
Fig. 3 is the switching preparation process figure between base station among the present invention.
Fig. 4 confirms flow chart for the switching between base station among the present invention.
Fig. 5 is the flow chart of the inventive method.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
The present invention has disclosed a kind of cell switching method that improves handover success rate, and when serving BS sent switching command to the switching user, handover-target base station also sent switching command to same switching user; When user terminal feedback switch acknowledgment message, serving BS and target BS can detect this message.Adopt technical scheme of the present invention, can not change the L1 of LTE system substantially, under the prerequisite of L2 control signaling, improve and switch the probability that the user successfully receives switching command, reduce the delay of user's chain of command, accelerate the time of user's successful switch.
The present invention specifically comprises switches set-up procedure, switches the affirmation process, below is described in detail respectively.For making effect of the present invention more excellent, sub-district and minizone is descending synchronous in the present embodiment supposing the system, and has the function of combined dispatching between sub-district and the sub-district.
[switching set-up procedure]
Switching preparation process of the present invention comprises specifically as shown in Figure 3:
Steps A 1, serving BS are made and are switched decision, then send handoff request message to target BS, concrete message content the same with regulation in the LTE system [referring to list of references two " 3GPP TR 36.331, " Evolved Universal Terrestrial RadioAccess (E-UTRA); Radio Resource Control (RRC)) ", 2008. "];
Steps A 2, target BS determine whether to agree handoff request according to admission control algorithm, if agree, target BS sends switch acknowledgment message to serving BS, concrete message content the same with regulation in the LTE system [referring to list of references two " 3GPP TR36.331, " Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC)) ", 2008. "];
Steps A 3, serving BS and target BS consult to send the employed resource information of switching command, in negotiation, based on the downlink resource of serving BS distribution, but serving BS need be considered when Resources allocation and can not conflict with the position and the control channel position of target BS descending pilot frequency; After target BS obtains the descending assignment information and switching command message content about switching command message of serving BS, if being used in the resource location that sends switching command message, the descending branch of serving BS conflicts with the descending pilot frequency position and the control channel position of target BS, then can select not send out switching command message, if do not conflict, then target BS distributes corresponding downlink resource to be used for transmitting switching command message;
Steps A 4, serving BS informing user terminal send the downlink resource assignment information of switching command message, concrete message content regulation basic and in the LTE system the same [referring to list of references three " 3GPP TR 36.211, " Evolved Universal TerrestrialRadio Access (E-UTRA); Physical channels and modulation ", 2008. "], but extra increasing comprises the indication information whether target BS sends switching command message;
Steps A 5, serving BS and target BS send switching command to same user terminal on same Resource Block, the definition of Resource Block the same with the regulation of LTE [referring to list of references three " 3GPP TR 36.211, " Evolved Universal TerrestrialRadio Access (E-UTRA); Physical channels and modulation ", 2008. "].
[switching the affirmation process]
Process that switch to confirm step is specifically as shown in Figure 4:
Step B1, user terminal insert by Random Access Channel and target BS, detailed process the same with regulation in the LTE system [referring to list of references one " 3GPP TR 36.300, " Evolved Universal Terrestrial Radio Access (E-UTRA); Overall description ", 2008. "];
Step B2, target BS and serving BS carry out the resource negotiation of switch acknowledgment message, in negotiation, based on the ascending resource of target BS distribution; After serving BS obtains the uplink assignment information about switch acknowledgment message of target BS, distribute corresponding ascending resource to be used for receiving switch acknowledgment message, when if the resource location of the up transmission switch acknowledgment message that target BS distributes conflicts with the ascending control channel of serving BS or ascending pilot frequency position, serving BS can select not distribute corresponding ascending resource to be used for receiving the switch acknowledgment message of user terminal feedback;
Step B3, target BS distribute ascending resource to give user terminal by Physical Downlink Control Channel (PDCCH), and informing user terminal time adjustment information, particular content the same with regulation in the LTE system [referring to list of references three " 3GPP TR 36.211, " Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulaion ", 2008. "];
Step B4, user terminal send by Uplink Shared Channel (PUSCH) and switch confirmation, concrete message content the same with regulation in the LTE system [referring to list of references two " 3GPP TR 36.331, " Evolved Universal Terrestrial RadioAccess (E-UTRA); Radio Resource Control (RRC)) ", 2008. "];
Step B5, serving BS are forwarded to target BS to switching confirmation demodulation of receiving or decoding back again by X2 interface, and target BS merges processing when receiving, improve the receiving gain of switch acknowledgment message.
In addition, among the present invention, before described switching set-up procedure, also comprise measuring process, specifically comprise:
01, the measuring process of serving BS configure user terminal;
02, serving BS informing user terminal ascending resource assignment information;
03, user terminal is reported to serving BS to measurement report.
Idiographic flow of the present invention can be consulted Fig. 5, and Fig. 5 prepares and switches the flow process of carrying out with the switching in third generation partner program Long Term Evolution (3GPP LTE) standard is reference, and method of the present invention is elaborated, and concrete steps are as follows:
1) measuring process of serving BS configure user terminal;
2) serving BS informing user terminal ascending resource assignment information;
3) user terminal is reported to serving BS to measurement report;
4) serving BS is made according to the information of measurement report and RRM (RRM) and is switched decision, sends handoff request then and gives target BS, transmits the essential handover preparation information of some target BS simultaneously;
5) hand off signaling of target BS preparation layer 1/ layer 2 (L1/L2), concurrent Handover Request Acknowledge is to serving BS; Its middle level 1 (L1) is physical layer (PHY), and layer 2 (L2) are divided into three sublayers, medium access control preparative layer (MAC), wireless chain control layer (RLC) and packet data convergence protocol (PDCP).Handover Request Acknowledge comprises some information of switching command;
6) serving BS and target BS carry out the resource allocation information negotiation of switching command message;
7) serving BS informing user terminal downlink resource assignment information;
8) serving BS and target BS send switching command message to user terminal on same resource block, serving BS is transferred to target BS to the serial-number-state of the PDCP of user terminal (PDCP) simultaneously, and the data forwarding that does not pass to user terminal is arrived target BS;
9) user terminal inserts by Random Access Channel and target BS;
10) target BS and serving BS carry out the resource negotiation of switch acknowledgment message;
11) target BS distributes ascending resource to give user terminal, and informing user terminal time adjustment information;
12) user terminal sends and switches confirmation to serving BS and target BS, serving BS is forwarded to target BS again the switching confirmation demodulation of receiving or after decoding, target BS merges processing when receiving, improve the receiving gain of switch acknowledgment message.
In sum, the present invention sends the technology of switching command message to user terminal by serving BS and target BS, improved the success rate that switching command message is received by user terminal effectively, and then avoided user terminal not carry out rebuliding of Radio Resource control (RRC) connection because of receiving switching command message, reduce the time delay of user terminal chain of command, improved success rate for switching.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to disclosed embodiment.
The present invention can be used for the various standards of wireless telecommunications, is not limited to 3GPP LTE standard.
Claims (9)
1. cell switching method that improves handover success rate is characterized in that:
Described method comprises the switching set-up procedure, comprising:
A1, serving BS are made and are switched decision, then send handoff request message to target BS;
Whether A2, the decision of described target BS agree handoff request, if agree, target BS sends switching request acknowledgement message to described serving BS;
A3, described serving BS and target BS consult to send the employed resource information of switching command;
Whether A4, described serving BS send the indication of handover information by the downlink resource assignment information of Physical Downlink Control Channel informing user terminal about switching command message comprising target BS;
A5, described serving BS and target BS send switching command message to described same user terminal on same Resource Block;
Described method comprises switches the affirmation process, comprising:
B1, described user terminal insert by Random Access Channel and target BS;
B2, described target BS and service base station negotiate receive the ascending resource position of switching confirmation;
B3, described target BS distribute ascending resource to give user terminal by Physical Downlink Control Channel, and informing user terminal time adjustment information;
B4, described user terminal send by Physical Uplink Shared Channel and switch confirmation;
B5, described serving BS are forwarded to target BS the switching confirmation demodulation of receiving or after decoding, and target BS merges processing when receiving.
2. according to the cell switching method of the described raising handover success rate of claim 1, it is characterized in that:
In the described steps A 3, employed resource is the descending resource information that is used to send switching command message that described serving BS distributes;
Described target BS distributes corresponding downlink resource to be used for transmitting switching command message after obtaining the descending assignment information and switching command message content about switching command message of serving BS;
The content of described negotiation can be included in serving BS and send in the handoff request message of target BS and the switching request acknowledgement message that target BS sends to serving BS.
3. according to the cell switching method of claim 1 or 2 described raising handover success rates, it is characterized in that:
In the described steps A 3, the resource location of the descending transmission switching command message that serving BS and target BS are consulted does not conflict with the position of described serving BS and target BS descending pilot frequency; The resource of the descending transmission switching command message that serving BS and target BS are consulted is not conflicted with the control channel and the position of broadcast channel of described serving BS and target BS;
In the described steps A 3, if when conflict in the control channel position of the resource location of the descending transmission switching command message that serving BS distributes and target BS or descending pilot frequency position, target BS can select not send switching command message;
In the described steps A 4, whether serving BS sends the indication of switching command message by the downlink resource assignment information of Physical Downlink Control Channel informing user terminal about switching command message comprising target BS.
4. according to the cell switching method of the described raising handover success rate of claim 1, it is characterized in that:
Among the described step B2, ascending resource is the up resource information that is used to receive the switching confirmation that described target BS distributes;
After described serving BS obtains the uplink assignment information about the switching confirmation of target BS, distribute corresponding ascending resource to be used for receiving and switch confirmation;
Described target BS and service base station negotiate are when switching the uplink assignment resource of confirmation, if when the resource location of the up transmission switching confirmation that target BS distributes conflicted with the ascending control channel of serving BS or ascending pilot frequency position, serving BS can select not distribute corresponding ascending resource to be used for receiving the switching confirmation of user terminal feedback.
5. according to the cell switching method of the described raising handover success rate of claim 1, it is characterized in that:
In the steps A 2, described target BS determines whether to agree handoff request according to admission control algorithm, if agree, target BS sends switching request acknowledgement message to described serving BS.
6. according to the cell switching method of the described raising handover success rate of claim 1, it is characterized in that:
Before described switching set-up procedure, also comprise measuring process, comprising:
01, the measuring process of serving BS configure user terminal;
02, serving BS informing user terminal ascending resource assignment information;
03, user terminal is reported to serving BS to measurement report.
7. according to the cell switching method of the described raising handover success rate of claim 1, it is characterized in that:
Among the step B1, after user terminal is received switching command message, carry out synchronizing process, be synchronized to target BS.
8. according to the cell switching method of the described raising handover success rate of claim 1, it is characterized in that:
Described method comprises the steps:
The measuring process of serving BS configure user terminal;
Serving BS informing user terminal ascending resource assignment information;
User terminal is reported to serving BS to measurement report;
Serving BS is made according to the information of measurement report and RRM RRM and is switched decision, sends handoff request then and gives target BS, transmits the essential handover preparation information of some target BS simultaneously;
The hand off signaling that the target BS preparation layer is 1/ layer 2, concurrent switching request acknowledgement message is to serving BS; Switching request acknowledgement message comprises the relevant information of switching command;
Serving BS and target BS carry out the resource allocation information of switching command message to be consulted;
Serving BS informing user terminal downlink resource assignment information;
Serving BS and target BS send switching command message to user terminal on same resource block, serving BS is transferred to target BS to the serial-number-state of the PDCP of user terminal simultaneously, and the data forwarding that does not pass to user terminal is arrived target BS;
User terminal inserts by Random Access Channel and target BS;
Target BS and serving BS switch the resource negotiation of confirmation;
Target BS distributes ascending resource to give user terminal, and informing user terminal time adjustment information;
User terminal sends and switches confirmation to serving BS and target BS, and serving BS is forwarded to target BS again the switching confirmation demodulation of receiving or after decoding, and target BS merges processing when receiving.
9. cell switching method that improves handover success rate is characterized in that:
Described method comprises the switching set-up procedure, comprising:
A1, serving BS are made and are switched decision, then send handoff request message to target BS;
Whether A2, the decision of described target BS agree handoff request, if agree, target BS sends switching request acknowledgement message to described serving BS;
A3, described serving BS and target BS consult to send the employed resource information of switching command;
The downlink resource assignment information of A4, described serving BS informing user terminal switching command;
A5, described serving BS and target BS send switching command to described same user terminal on same Resource Block.
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| CN111757399B (en) * | 2019-03-29 | 2021-09-07 | 华为技术有限公司 | Switching method, device and system in wireless communication system |
| CN112788673B (en) * | 2019-11-07 | 2023-05-05 | 华为技术有限公司 | Communication method, device and equipment |
| CN113056018B (en) * | 2021-03-30 | 2023-08-22 | 联想(北京)有限公司 | Control method |
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2008
- 2008-12-30 CN CN2008102049943A patent/CN101466127B/en not_active Expired - Fee Related
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| CN101466127A (en) | 2009-06-24 |
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