CN100542325C - Method for handover control - Google Patents
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- CN100542325C CN100542325C CNB2006100919825A CN200610091982A CN100542325C CN 100542325 C CN100542325 C CN 100542325C CN B2006100919825 A CNB2006100919825 A CN B2006100919825A CN 200610091982 A CN200610091982 A CN 200610091982A CN 100542325 C CN100542325 C CN 100542325C
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Abstract
The invention provides multiple method for handover control, wherein a kind of method for handover control may further comprise the steps: step S302, target BS determines that subscriber equipment can insert after receiving the handoff request of subscriber equipment, send switch indicating information to described subscriber equipment; Step S304 after subscriber equipment receives switch indicating information, does not cut off with the Radio Link of source base station and is connected, and starts the process of setting up synchronously with target BS, and the user data that source base station will just send to subscriber equipment is forwarded to target BS; Step S306, after subscriber equipment and target BS were finished synchronous access procedure, subscriber equipment disconnected with source base station and being connected, and subscriber equipment has sent the correctly data sequence number of transmission to target BS; Step S308, target BS is determined the user data of subscriber equipment is sent original position according to data sequence number; And step S310, subscriber equipment and target BS connect and communicate.
Description
Technical field
The present invention relates to the communications field, relate in particular to the method for handover control that is used for communication network.
Background technology
3GPP (third generation collaborative project) LTE (Long Term Evolution) project is the new technology development project of the maximum of 3GPP startup over the past two years, because the physical-layer techniques aspect of interface aloft, downlink transfer has adopted advanced and mature OFDM (OFDM) technology, the uplink mode is defined as the lower single carrier frequency division of peak-to-average force ratio multiplexing (SC-FDMA), has remarkable advantages such as spectrum efficiency height, downlink transfer speed is big, propagation delay time is little.
Access Network architecture among the LTE as shown in Figure 1, E-UTRAN (the UMTS Radio Access Network of evolution) is made up of eNB (Node B of evolution), has realized U-plane (user's face) and C-plane (chain of command) agreement towards UE (subscriber equipment) among the eNB.Connect by X2 interface between the eNB, promptly all eNB exist X2 interface between any two and connect the communication that is used to finish each other, for example realize that the data of UE in handoff procedure shift.Simultaneously, eNB is connected with EPC (packet-based core networks) by the S1 interface, has supported being connected of MME (mobile management entity)/UPE (user entity) realization multi-to-multi among eNB and the aGW (IAD).Wherein, eNB finishes the function relevant with RRM, and MME/UPE has finished the function that user face data switches in the mobile management of UE.
Handoff procedure in the mobile communication system is meant the communication period of travelling carriage in the mobile communication system that is made of a plurality of sub-districts, owing to the position changes, and the process of the annexation of change and network.In handoff procedure, the performance index of system require because the transfer of data that switching is produced is as much as possible little break period, and the time delay in the handoff procedure is as much as possible little.
When taking place according to switching, travelling carriage is different with former base station and target BS connected mode, switching can be divided into direct-cut operation and soft handover.Direct-cut operation is meant that travelling carriage is that target BS sets up before the new communication link, interrupts the connected mode of old communication link earlier, i.e. break-before-make.In direct-cut operation, the communication link of travelling carriage must be through the process of an interruption, and be the important indicator of weighing the direct-cut operation performance this break period.Soft handover is meant that in handoff procedure travelling carriage is at first set up new communication link with target BS, and then the communication link between cut-out and the former base station, the i.e. switching mode of make-before-break.In soft switching process, travelling carriage keeps communication link with target BS and former base station simultaneously, there is not break period, but taken the air-link resources of target BS and former base station in the handoff procedure simultaneously, when having obtained macro diversity, caused the redundancy waste of system resource.
As shown in Figure 2, adopted the auxiliary mode of network side eNB control UE end to finish switching in the existing LTE system, switching controls operation in the switching is finished by eNB, and MME/UPE does not participate in switching controls and the transmission and the path transfer of just responsible user face data stream.The hand off signaling handling process of its chain of command is as follows:
Step S202, UE end is finished the measurement of specification signal value and is sent " measurement reports " message to source eNB according to the measurement triggering condition of stipulating in the agreement.
Whether step S204, the source eNB that is serving switch to target eNB with UE according to measurement value of reporting and wireless resource management information decision.Switch if desired, then send " handoff request " message to target eNB.
After step S206, target eNB are received " handoff request " message, judge whether to allow current access request according to the requirement of access control.If target eNB has allowed current switching to insert request, then send " Handover Request Acknowledge " message to source eNB.
After step S208, source eNB receive " Handover Request Acknowledge " message, send " switching indication " message to UE, UE is after receiving this message, and cut-out is connected with the Radio Link of eNB sub-district, source, and prepares to be initiated to the synchronizing process of target eNB sub-district.
After step S210, process regular hour postponed, UE cut off and is connected with the Radio Link of source eNB, and the synchronizing process of initiation subsequently and target eNB.
Step S212, if target eNB and UE finish synchronizing process, then target eNB is distributed corresponding access parameter to UE, comprise ascending resource assignation and up time unifying, UE sends " switch and confirm " message to target eNB after receiving this access parameter, confirms that the handoff procedure of UE side finishes.
Step S214a, target eNB send " switching is finished " message to source eNB after receiving " switch and confirm " message that UE sends, notification source eNB handoff procedure is finished.Source eNB receives after " switching is finished " message that the data that source eNB will also not be transmitted to target eNB continue to finish forwarding, and the data that will be transmitted to target eNB empty from buffer area.
Step S214b, target eNB send " renewal of UE position " message to MME/UPE after receiving " switch and confirm " message that UE sends, MME/UPE is after receiving this message, and routing update and the beginning of finishing UE send user data to target eNB.
According to above-mentioned handoff procedure, the transmission rule of regulation user side data between MME/UPE, source eNB/ target eNB and UE is as follows in the prior art:
1, before UE receives " switching indication " message that source eNB sends, send to source eNB from the user data of MME/UPE, through the air interface between source eNB and the UE user data is sent to corresponding UE then.
2, after UE receives " switching indication " message that source eNB sends, the Radio Link between source eNB and the UE connects and is released, and source eNB no longer sends data to UE, still directly sends to buffer memory among the eNB of source from the user data of MME/UPE.
3, at source eNB after UE sends " switching indication " message, set up the user side data passage by X2 interface between source eNB and the target eNB, be used for source eNB not being begun to send and also not being transmitted to target eNB from source eNB by the correct user data that receives of UE, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.
4, after source eNB receives " switching is finished " message, source eNB will be forwarded to target eNB corresponding to all remaining datas that switch UE, and empty the corresponding cache data.
Receive at MME/UPE that 5, MME/UPE sends to source eNB with user data before " renewal of UE position " message.
Receive at MME/UPE 6, after " renewal of UE position " message that MME/UPE finishes the path switching of UE, begins the user data of UE is sent to target eNB, through the air interface between target eNB and the UE user data is sent to UE then.
From above-mentioned handoff procedure as can be seen, the hard handover approach of available technology adopting, its HO-break duration is to receive " switching indication " message from UE, cut off with the Radio Link of source eNB and be connected, until UE and target eNB finished synchronizing process and finished the signalling interactive process on upper strata, target eNB and UE set up Radio Link and are connected and begin transfer of data.Therefore be made up of synchronous delay turn-on time and signaling transmission process time delay two parts the break period of direct-cut operation in the prior art, and postponing general transmission process time delay much larger than signaling synchronously turn-on time, is the direct-cut operation major part of break period.
In the direct-cut operation of existing LTE system, the break period of direct-cut operation is linear increasing along with the increase that postpones turn-on time synchronously between UE and the target eNB, if and the synchronizing process of UE and target eNB failure, UE needs to recover to be connected with the Radio Link of source eNB by synchronizing process again, make HO-break duration long, thereby had a strong impact on the performance of wireless communication system.
Summary of the invention
At above problem, the invention provides multiple effective quick switching-over control, reduced the break period in the direct-cut operation, avoided the redundant waste of the Radio Resource in the soft switching process simultaneously.
First kind of method for handover control of the present invention may further comprise the steps: step S302, target BS determine that subscriber equipment can insert after receiving the handoff request of subscriber equipment; Step S304 after subscriber equipment receives switch indicating information, does not cut off with the Radio Link of source base station and is connected, and starts the process of setting up synchronously with target BS, and the user data that source base station will just send to subscriber equipment is forwarded to target BS; Step S306, after subscriber equipment and target BS were finished synchronous access procedure, subscriber equipment disconnected with source base station and being connected, and subscriber equipment has sent the correctly data sequence number of transmission to target BS; Step S308, target BS is determined the user data of subscriber equipment is sent original position according to data sequence number; And step S310, subscriber equipment and target BS connect and communicate.
Wherein, can be subscriber equipment be sent to the handoff request of target BS by source base station to handoff request, also can be the handoff request that subscriber equipment directly is sent to target BS.
In step S304, after subscriber equipment receives the switch indicating information of source base station, by the data communication of maintenance of data service shared channel and source base station, the synchronizing sequence of code acquisition target BS simultaneously.
In step S304, after the downlink synchronization of subscriber equipment by sync-sequence search foundation and target BS, subscriber equipment is finished synchronous access procedure not cutting off under the situation about being connected with the Radio Link of source base station by Random Access Channel and target BS.
In step S306, data sequence number is sent in the switch acknowledgment message of target BS and is sent to target BS by being added on subscriber equipment.
First kind of method for handover control of the present invention is used for communication network, is particularly useful for long-term evolving network.
Second kind of method for handover control of the present invention may further comprise the steps: step S502, target BS determine that subscriber equipment can insert after receiving the handoff request of subscriber equipment; Step S504 after subscriber equipment receives switch indicating information, does not cut off with the Radio Link of source base station and is connected, and starts the process of setting up synchronously with target BS, and the user data that source base station will just send to subscriber equipment is forwarded to target BS; Step S506, after subscriber equipment and target BS were finished synchronous access, subscriber equipment disconnected with source base station and being connected, and switches to target BS; After step S508, source base station receive the handoff completion message of target BS transmission, sent the correctly data sequence number of transmission, continue to transmit remaining user data, and deletion has been sent to the user data of subscriber equipment to target BS to target BS; Step S510, target BS are after receiving data sequence number, and target BS is determined the user data of subscriber equipment is sent original position according to data sequence number; And step S512, subscriber equipment and target BS communicate.
Wherein, can be subscriber equipment be sent to the handoff request of target BS by source base station to handoff request, also can be the handoff request that subscriber equipment directly is sent to target BS.
Second kind of method for handover control of the present invention is used for communication network, is particularly useful for long-term evolving network.
The third method for handover control of the present invention may further comprise the steps: step S702, target BS determine that subscriber equipment can insert after receiving the handoff request of subscriber equipment; Step S704 after subscriber equipment receives switch indicating information, does not cut off with the Radio Link of source base station and is connected, and the process of setting up synchronously of startup and target BS; Step S706, after subscriber equipment and target BS are finished synchronous access procedure, be connected with the source base station disconnection, and send switch acknowledgment message to source base station and target BS respectively, after source base station receives the source switch acknowledgment message, with just at buffer memory and the user data that is not sent to subscriber equipment be sent to target BS; Step S708, target BS finish the switching with the network side functional entity, connect with subscriber equipment and communicate.
Wherein, can be subscriber equipment be sent to the handoff request of target BS by source base station to handoff request, also can be the handoff request that subscriber equipment directly is sent to target BS.
The third method for handover control of the present invention is used for communication network, is particularly useful for long-term evolving network.
The 4th kind of method for handover control of the present invention may further comprise the steps: after step S902, source base station determine that subscriber equipment can insert, given Radio Link release relay information is sent to subscriber equipment by switch indicating information; Step S904 after subscriber equipment is received switch indicating information, does not cut off with the Radio Link of source base station and is connected, and starts the process of setting up synchronously with target BS, and source base station is just transmitted user data in buffer memory and transmission to target BS; Step S906, after the Radio Link release relay time arrives, subscriber equipment cuts off Radio Link simultaneously with target BS and is connected, and source base station has sent the correctly data sequence number of transmission to target BS, and target BS determines that according to data sequence number the user data of subscriber equipment sends original position; And step S908, target BS is finished the switching with the network side functional entity, connects with subscriber equipment and communicates.
The 4th kind of method for handover control of the present invention is used for communication network, is particularly useful for long-term evolving network.
The method for handover control of the application of the invention has reduced the break period in the direct-cut operation effectively, has avoided the redundant waste of the Radio Resource in the soft switching process simultaneously.
Description of drawings
Accompanying drawing provides further understanding of the present invention, and is attached to a part that constitutes the application among the application, illustrates that with specification embodiments of the invention are to explain principle of the present invention.In the accompanying drawings,
Fig. 1 is the E-UTRAN structured flowchart according to prior art;
Fig. 2 is the switching schematic diagram according to prior art;
Fig. 3 is the flow chart according to first kind of method for handover control of the present invention;
Fig. 4 is the schematic diagram of first kind of method for handover control according to an embodiment of the invention;
Fig. 5 is the flow chart according to second kind of method for handover control of the present invention;
Fig. 6 is the schematic diagram of second kind of method for handover control according to an embodiment of the invention;
Fig. 7 is the flow chart according to the third method for handover control of the present invention;
Fig. 8 is the schematic diagram of the third method for handover control according to an embodiment of the invention;
Fig. 9 is the flow chart according to the 4th kind of method for handover control of the present invention; And
Figure 10 is the schematic diagram of the 4th kind of method for handover control according to an embodiment of the invention.
Embodiment
Describe embodiments of the invention in detail below with reference to accompanying drawing.
The thought of method for handover control of the present invention is: in handoff procedure, during the synchronizing sequence of user equipment searches target BS, subscriber equipment does not cut off and being connected of source base station, and subscriber equipment and target BS synchronously after and before subscriber equipment and target BS connect, the subscriber equipment cut-out is connected with source base station.
Fig. 3 is the flow chart according to first kind of method for handover control of the present invention.As shown in Figure 3, first kind of method for handover control according to the present invention may further comprise the steps:
Step S302, target BS determine that subscriber equipment can insert after receiving the handoff request of subscriber equipment.
Step S304 after subscriber equipment receives switch indicating information, does not cut off with the Radio Link of source base station and is connected, and starts the process of setting up synchronously with target BS, and the user data that source base station will just send to subscriber equipment is forwarded to target BS.
Step S306, after subscriber equipment and target BS were finished synchronous access procedure, subscriber equipment disconnected with source base station and being connected, and subscriber equipment has sent the correctly data sequence number of transmission to target BS.
Step S308, target BS is determined the user data of subscriber equipment is sent original position according to data sequence number.
Step S310, subscriber equipment and target BS connect and communicate.
Wherein, can be subscriber equipment be sent to the handoff request of target BS by source base station to handoff request, also can be the handoff request that subscriber equipment directly is sent to target BS.
In step S304, after subscriber equipment receives the switch indicating information of source base station, by the data communication of maintenance of data service shared channel and source base station, the synchronizing sequence of code acquisition target BS simultaneously.
In step S304, after the downlink synchronization of subscriber equipment by sync-sequence search foundation and target BS, subscriber equipment is finished synchronous access procedure not cutting off under the situation about being connected with the Radio Link of source base station by Random Access Channel and target BS.
In step S306, data sequence number is sent in the switch acknowledgment message of target BS and is sent to target BS by being added on subscriber equipment.
First kind of method for handover control of the present invention is used for communication network, is particularly useful for long-term evolving network.
In existing LTE system direct-cut operation, the break period of direct-cut operation is linear increasing along with the increase that postpones turn-on time synchronously between UE and the target eNB, if and the synchronizing process failure needs recovery again to be connected the shortcoming that causes direct-cut operation increase break period with the Radio Link of source eNB, and in soft switching process general in the existing cdma system, because the air-link resources of a plurality of base stations in the Active Set that UE taken simultaneously causes the redundant waste of Radio Resource, the shortcoming that power system capacity reduces, the present invention proposes a kind of effective quick switching-over control, reduce the break period in the direct-cut operation, avoided the redundant waste of the Radio Resource in the soft switching process simultaneously.
Fig. 4 is the schematic diagram of first kind of method for handover control according to an embodiment of the invention.As shown in Figure 4, first kind of method for handover control of embodiments of the invention continued to use the auxiliary switching controls structure of network side eNB control UE end in the existing LTE system, switching controls operation in the switching is finished by eNB, and MME/UPE does not participate in switching controls and the transmission and the path transfer of just responsible user face data stream.The hand off signaling handling process of its chain of command is as follows:
Step S402, UE end is finished the measurement of specification signal value and is sent " measurement reports " message to source eNB according to the measurement triggering condition of stipulating in the agreement.
Whether step S404, the source eNB that is serving switch to target eNB with UE according to measurement value of reporting and wireless resource management information decision.Switch if desired, then send " handoff request " message to target eNB.
After step S406, target eNB are received " handoff request " message, judge whether to allow current access request according to the requirement of access control.If target eNB has allowed current switching to insert request, then send " Handover Request Acknowledge " message to source eNB.
After step S408, source eNB receive " Handover Request Acknowledge " message, send " switching indication " message to UE, with having set up the user side data passage by X2 interface between opisthogenesis eNB and the target eNB, be used for source eNB not being begun to send and also not being transmitted to target eNB from source eNB by the correct user data that receives of UE, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.
Step S410, UE are after receiving " switching indication " message, through after the given time delay, be initiated to the synchronizing process of target eNB sub-district, but do not cut off with the Radio Link of source eNB and is not connected, still transmit data by UL/DL-SCH (on/descending shared data channel).In this process, UE still keeps being connected with the Radio Link of source eNB by UL/DL-SCH and control corresponding channel, walk abreast, UE is not cutting off under the situation about being connected with source eNB Radio Link, can but be not limited to finish synchronous access procedure by Random Access Channel and target eNB.
If step S412 target eNB and the success of UE synchronizing process, then target eNB is distributed corresponding access parameter to UE, comprise ascending resource assignation and up time unifying, UE sends " switch and confirm " message to target eNB after receiving this access parameter, confirms that the handoff procedure of UE side finishes.Discharge with source eNB in the UE side subsequently and be connected by the Radio Link that UL/DL-SCH keeps.Carried the packet sequence number SN that UE has correctly received in this " switch confirm " message, target eNB begins the data to UE transmission buffer area from the position of SN sign receiving this message after, the continuity of the transfer of data that guaranteed to eat dishes without rice or wine.If synchronizing process failure, then UE directly return back to and is connected with the Radio Link of source eNB and does not need to initiate again synchronizing process with source eNB.
Step S414a, target eNB send " switching is finished " message to source eNB after receiving " switch and confirm " message that UE sends, notification source eNB handoff procedure is finished.Source eNB receives after " switching is finished " message, and source eNB discharges to be connected with the Radio Link of UE and stops UE transmission data, and the data that will also not be transmitted to target eNB continue to finish forwarding, and the buffer area that empties the forwarding data.
Step S414b, target eNB send " renewal of UE position " message to MME/UPE after receiving " switch and confirm " message that UE sends, MME/UPE is after receiving this message, and routing update and the beginning of finishing UE send user data to target eNB.
The handoff procedure of preferred version one according to the present invention, the transmission rule of user side data between MME/UPE, source eNB/ target eNB and UE is as follows:
1, at UE before " switch and confirm " message that target eNB sends, send to source eNB from the user data of MME/UPE, through the air interface between source eNB and the UE user data is sent to corresponding UE then.
2, at source eNB after UE sends " switching indication " message, set up the user side data passage by X2 interface between source eNB and the target eNB, be used for source eNB also is not transmitted to target eNB by the correct user data that receives of UE from source eNB, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.These data are also simultaneously by the shared data Channel Transmission between source eNB and the UE.
3, at UE after " switch and confirm " message that target eNB sends, still directly send to buffer memory among the eNB of source from the user data of MME/UPE.The Radio Link that has discharged between source eNB and the UE in the UE side connects, UE no longer receives the data from source eNB, while sets up in the UE side and is connected with the Radio Link of target eNB, and beginning sends upstream data and prepares the downlink data of reception from target eNB to target eNB.
4, after target eNB is received " switch and confirm " message of UE transmission, the data sequence number SN that has correctly received according to the UE that carries in the message, discharge the data before the SN in the target eNB buffer memory, and be connected with the UE Radio Link in the foundation of target eNB side, finish SN transfer of data afterwards by the shared data channel between target eNB and the UE.
5, after source eNB received " switching is finished " message of target eNB transmission, source eNB was forwarded to target eNB with all remaining datas in its buffer memory, and empties the corresponding cache data.Discharged with the Radio Link of UE in source eNB side simultaneously and be connected.
Receive at MME/UPE that 6, MME/UPE sends to source Enb with user data before " renewal of UE position " message.
Receive at MME/UPE 7, after " renewal of UE position " message that MME/UPE finishes the path switching of UE, begins the user data of UE is sent to target eNB, through the air interface between target eNB and the UE user data is sent to UE then.
Fig. 5 is the flow chart according to second kind of method for handover control of the present invention.As shown in Figure 5, second kind of method for handover control of the present invention may further comprise the steps:
Step S502, target BS determine that subscriber equipment can insert after receiving the handoff request of subscriber equipment.
Step S504 after subscriber equipment receives switch indicating information, does not cut off with the Radio Link of source base station and is connected, and starts the process of setting up synchronously with target BS, and the user data that source base station will just send to subscriber equipment is forwarded to target BS.
Step S506, after subscriber equipment and target BS were finished synchronous access, subscriber equipment disconnected with source base station and being connected, and switches to target BS.
After step S508, source base station receive the handoff completion message of target BS transmission, sent the correctly data sequence number of transmission, continue to transmit remaining user data, and deletion has been sent to the user data of subscriber equipment to target BS to target BS.
Step S510, target BS are after receiving data sequence number, and target BS is determined the user data of subscriber equipment is sent original position according to data sequence number.
Step S512, subscriber equipment and target BS communicate.
Wherein, can be subscriber equipment be sent to the handoff request of target BS by source base station to handoff request, also can be the handoff request that subscriber equipment directly is sent to target BS.
Second kind of method for handover control of the present invention is applied to communication network, especially is applied to long-term evolving network.
Fig. 6 is the schematic diagram of second kind of method for handover control according to an embodiment of the invention.As shown in Figure 6, second kind of method for handover control of embodiments of the invention continued to use the auxiliary switching controls structure of network side eNB control UE end in the existing LTE system, switching controls operation in the switching is finished by eNB, and MME/UPE does not participate in switching controls and the transmission and the path transfer of just responsible user face data stream.The hand off signaling handling process of its chain of command is as follows:
Step S602, UE end is finished the measurement of specification signal value and is sent " measurement reports " message to source eNB according to the measurement triggering condition of stipulating in the agreement.
Whether step S604, the source eNB that is serving switch to target eNB with UE according to measurement value of reporting and wireless resource management information decision.Switch if desired, then send " handoff request " message to target eNB.
After step S606, target eNB are received " handoff request " message, judge whether to allow current access request according to the requirement of access control.If target eNB has allowed current switching to insert request, then send " Handover Request Acknowledge " message to source eNB.
After step S608, source eNB receive " Handover Request Acknowledge " message, send " switching indication " message to UE, with having set up the user side data passage by X2 interface between opisthogenesis eNB and the target eNB, be used for source eNB not being begun to send and also not being transmitted to target eNB from source eNB by the correct user data that receives of UE, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.
Step S610, UE are after receiving " switching indication " message, through after the given time delay, be initiated to the synchronizing process of target eNB sub-district, unlike the prior art be, in synchronizing process, do not cut off with the Radio Link of source eNB and be connected, still by UL/DL-SCH (on/descending shared data channel) transmission data.In this process, UE still keeps being connected with the Radio Link of source eNB by UL/DL-SCH and control corresponding channel, walk abreast, UE is not cutting off under the situation about being connected with source eNB Radio Link, can but be not limited to finish synchronous access procedure by Random Access Channel and target eNB.
If step S612 target eNB and the success of UE synchronizing process, then target eNB is distributed corresponding access parameter to UE, comprise ascending resource assignation and up time unifying, UE sends " switch and confirm " message to target eNB after receiving this access parameter, confirms that the handoff procedure of UE side finishes.Discharge with source eNB in the UE side subsequently and be connected by the Radio Link that UL/DL-SCH keeps.If synchronizing process failure, then UE directly return back to and is connected with the Radio Link of source eNB and does not need to initiate again synchronizing process with source eNB.
Step S614a, target eNB send " switching is finished " message to source eNB after receiving " switch and confirm " message that UE sends, notification source eNB handoff procedure is finished.
Step S614b, target eNB send " renewal of UE position " message to MME/UPE after receiving " switch and confirm " message that UE sends, MME/UPE is after receiving this message, and routing update and the beginning of finishing UE send user data to target eNB.
Step S616, source eNB receive after " switching is finished " message, and source eNB discharges to be connected with the Radio Link of UE and stops UE transmission data, and the data that will also not be transmitted to target eNB continue to finish forwarding, and the buffer area that empties the forwarding data.Source eNB feeds back the data sequence number SN of correct transmission in the eNB of source to target eNB simultaneously, target eNB begins from the position of SN sign to send data the buffer area to UE after receiving this message, and empty data cached before the SN, the continuity of the transfer of data that guaranteed to eat dishes without rice or wine.
The handoff procedure of preferred version two according to the present invention, the transmission rule of user side data between MME/UPE, source eNB/ target eNB and UE is as follows:
1, at UE before " switch and confirm " message that target eNB sends, send to source eNB from the user data of MME/UPE, through the air interface between source eNB and the UE user data is sent to corresponding UE then.
2, at source eNB after UE sends " switching indication " message, set up the user side data passage by X2 interface between source eNB and the target eNB, be used for source eNB also is not transmitted to target eNB by the correct user data that receives of UE from source eNB, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.These data are also simultaneously by the shared data Channel Transmission between source eNB and the UE.
3, at UE after " switch and confirm " message that target eNB sends, still directly send to buffer memory among the eNB of source from the user data of MME/UPE.The Radio Link that has discharged between source eNB and the UE in the UE side connects, UE no longer receives the data from source eNB, while sets up in the UE side and is connected with the Radio Link of target eNB, and beginning sends upstream data and prepares the downlink data of reception from target eNB to target eNB.
5, after source eNB receives " switching is finished " message of target eNB transmission, to the data sequence number SN of target eNB feedback by the correct transmission of source eNB.And source eNB is forwarded to target eNB with all remaining datas in its buffer memory, and empties the corresponding cache data.Discharged with the Radio Link of UE in source eNB side simultaneously and be connected.
4, after target eNB is received the data sequence number SN that passes through the correct transmission of source eNB of source eNB feedback, according to the data sequence number SN that disappears, discharge the data before the SN in the target eNB buffer memory, and be connected with the UE Radio Link in the foundation of target eNB side, finish SN transfer of data afterwards by the shared data channel between target eNB and the UE.
Receive at MME/UPE that 6, MME/UPE sends to source Enb with user data before " renewal of UE position " message.
Receive at MME/UPE 7, after " renewal of UE position " message that MME/UPE finishes the path switching of UE, begins the user data of UE is sent to target eNB, through the air interface between target eNB and the UE user data is sent to UE then.
Fig. 7 is the flow chart according to the third method for handover control of the present invention.As shown in Figure 7, the third method for handover control of the present invention may further comprise the steps:
Step S702, target BS determine that subscriber equipment can insert after receiving the handoff request of subscriber equipment.
Step S704 after subscriber equipment receives switch indicating information, does not cut off with the Radio Link of source base station and is connected, and the process of setting up synchronously of startup and target BS.
Step S706, after subscriber equipment and target BS are finished synchronous access procedure, be connected with the source base station disconnection, and send switch acknowledgment message to source base station and target BS respectively, after source base station receives the source switch acknowledgment message, with just at buffer memory and the user data that is not sent to subscriber equipment be sent to target BS.
Step S708, target BS finish the switching with the network side functional entity, connect with subscriber equipment and communicate.
Wherein, can be subscriber equipment be sent to the handoff request of target BS by source base station to handoff request, also can be the handoff request that subscriber equipment directly is sent to target BS.
The third method for handover control of the present invention is applied to communication network, especially is applied to long-term evolving network.
Fig. 8 is the schematic diagram of the third method for handover control according to an embodiment of the invention.As shown in Figure 8, the third method for handover control of the present invention has been continued to use the auxiliary switching controls structure of network side eNB control UE end in the existing LTE system, switching controls operation in the switching is finished by eNB, and MME/UPE does not participate in switching controls and the transmission and the path transfer of just responsible user face data stream.The hand off signaling handling process of its chain of command is as follows:
Step S802, UE end is finished the measurement of specification signal value and is sent " measurement reports " message to source eNB according to the measurement triggering condition of stipulating in the agreement.
Whether step S804, the source eNB that is serving switch to target eNB with UE according to measurement value of reporting and wireless resource management information decision.Switch if desired, then send " handoff request " message to target eNB.
After step S806, target eNB are received " handoff request " message, judge whether to allow current access request according to the requirement of access control.If target eNB has allowed current switching to insert request, then send " Handover Request Acknowledge " message to target eNB.
After step S808, source eNB receive " Handover Request Acknowledge " message, send " switching indication " message to UE.
Step S810, UE are after receiving " switching indication " message, through after the given time delay, be initiated to the synchronizing process of target eNB sub-district, but do not cut off with the Radio Link of source eNB and is not connected, still transmit data by UL/DL-SCH (on/descending shared data channel).In this process, UE still keeps being connected with the Radio Link of source eNB by UL/DL-SCH and control corresponding channel, walk abreast, UE is not cutting off under the situation about being connected with source eNB Radio Link, can but be not limited to finish synchronous access procedure by Random Access Channel and target eNB.
If step S812a target eNB and the success of UE synchronizing process, then target eNB is distributed corresponding access parameter to UE, comprise ascending resource assignation and up time unifying, UE sends " switch and confirm " message to target eNB after receiving this access parameter, confirms that the handoff procedure of UE side finishes.If synchronizing process failure, then UE directly return back to and is connected with the Radio Link of source eNB and does not need to initiate again synchronizing process with source eNB.
If step S812b target eNB and the success of UE synchronizing process, then UE sends " switch and confirm " message to source eNB after receiving up access parameter, the handoff procedure of confirming the UE side finishes, be connected with the Radio Link of source eNB in the release of UE side, notification source eNB discharges and is connected with the Radio Link of UE simultaneously.With having set up the user side data passage by X2 interface between opisthogenesis eNB and the target eNB, be used for source eNB not being begun to send and also not being transmitted to target eNB from source eNB by the correct user data that receives of UE, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.
Step S814a, target eNB send " switching is finished " message to source eNB after receiving " switch and confirm " message that UE sends, notification source eNB handoff procedure is finished.Source eNB receives after " switching is finished " message that the data that source eNB will also not be transmitted to target eNB continue to finish forwarding, and the data that will be transmitted to target eNB empty from buffer area.
Step S814b, target eNB send " renewal of UE position " message to MME/UPE after receiving " switch and confirm " message that UE sends, MME/UPE is after receiving this message, and routing update and the beginning of finishing UE send user data to target eNB.
According to above-mentioned handoff procedure, the transmission rule of regulation user side data between MME/UPE, source eNB/ target eNB and UE is as follows in the prior art:
1, at UE before " switch and confirm " message that source eNB sends, send to source eNB from the user data of MME/UPE, through the air interface between source eNB and the UE user data is sent to corresponding UE then.
2, at UE after " switch and confirm " message that source eNB sends, the Radio Link between source eNB and the UE connects and is released, source eNB no longer sends data to UE, still directly sends to buffer memory among the eNB of source from the user data of MME/UPE.
3, after source eNB receives " switch and confirm " message of UE transmission, set up the user side data passage by X2 interface between source eNB and the target eNB, be used for source eNB not being begun to send and also not being transmitted to target eNB from source eNB by the correct user data that receives of UE, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.
4, after source eNB receives " switching is finished " message of target eNB transmission, source eNB will be forwarded to target eNB corresponding to all remaining datas that switch UE, and empty the corresponding cache data.
Receive at MME/UPE that 5, MME/UPE sends to source Enb with user data before " renewal of UE position " message.
Receive at MME/UPE 6, after " renewal of UE position " message that MME/UPE finishes the path switching of UE, begins the user data of UE is sent to target eNB, through the air interface between target eNB and the UE user data is sent to UE then.
Fig. 9 is the flow chart according to the 4th kind of method for handover control of the present invention.As shown in Figure 9, the 4th kind of method for handover control of the present invention may further comprise the steps:
After step S902, target BS determine that subscriber equipment can insert, given Radio Link release relay information is sent to subscriber equipment by switch indicating information.
Step S904 after subscriber equipment is received switch indicating information, does not cut off with the Radio Link of source base station and is connected, and starts the process of setting up synchronously with target BS, and source base station is just transmitted user data in buffer memory and transmission to target BS.
Step S906, after the Radio Link release relay time arrives, subscriber equipment cuts off Radio Link simultaneously with target BS and is connected, and source base station has sent the correctly data sequence number of transmission to target BS, and target BS determines that according to data sequence number the user data of subscriber equipment sends original position.
Step S908, target BS finish the switching with the network side functional entity, connect with subscriber equipment and communicate.
The 4th kind of method for handover control of the present invention is used for communication network, is particularly useful for long-term evolving network.
Figure 10 is the schematic diagram of the 4th kind of method for handover control according to an embodiment of the invention.As shown in figure 10, the 4th kind of method for handover control of embodiments of the invention continued to use the auxiliary switching controls structure of network side eNB control UE end in the existing LTE system, switching controls operation in the switching is finished by eNB, and MME/UPE does not participate in switching controls and the transmission and the path transfer of just responsible user face data stream.The hand off signaling handling process of its chain of command is as follows:
Step S1002, UE end is finished the measurement of specification signal value and is sent " measurement reports " message to source eNB according to the measurement triggering condition of stipulating in the agreement.
Whether step S1004, the source eNB that is serving switch to target eNB with UE according to measurement value of reporting and wireless resource management information decision.Switch if desired, then send " handoff request " message to target eNB.
After step S1006, target eNB are received " handoff request " message, judge whether to allow current access request according to the requirement of access control.If target eNB has allowed current switching to insert request, then send " Handover Request Acknowledge " message to source eNB.
After step S1008, source eNB receive " Handover Request Acknowledge " message, send " switching indication " message to UE, with having set up the user side data passage by X2 interface between opisthogenesis eNB and the target eNB, be used for source eNB not being begun to send and also not being transmitted to target eNB from source eNB by the correct user data that receives of UE, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.Send in " switching indication " message of UE at source eNB, carried two regularly variablees, one is to determine that UE initiates the time delay variable of synchronizing process, and another is to determine that UE discharges the time delay variable that is connected with source eNB Radio Link.
Step S1010, UE are after receiving " switching indication " message, after postponing given lock in time, be initiated to the synchronizing process of target eNB sub-district, but do not cut off with the Radio Link of source eNB and is not connected, still transmit data by UL/DL-SCH (on/descending shared data channel).In this process, UE still keeps being connected with the Radio Link of source eNB by UL/DL-SCH and control corresponding channel, walk abreast, UE is not cutting off under the situation about being connected with source eNB Radio Link, can but be not limited to finish synchronous access procedure by Random Access Channel and target eNB.
If step S1012 target eNB and the success of UE synchronizing process, then target eNB is distributed corresponding access parameter to UE, comprise ascending resource assignation and up time unifying, UE sends " switch and confirm " message to target eNB after receiving this access parameter, confirms that the handoff procedure of UE side finishes.
Step S1014, UE are after receiving " switching indication " message, through after given release and the time delay that source eNB Radio Link is connected, the UE side discharges Radio Link simultaneously with source eNB side and is connected, and source eNB sends the data sequence number SN that has correctly transmitted among the eNB of source to target eNB.After target eNB is received data sequence number SN, discharge the data before the SN in the target eNB buffer memory, wait for after setting up the target eNB side and the UE Radio Link is connected, finish SN transfer of data afterwards by the shared data channel between target eNB and the UE.
Step S1016a, target eNB send " switching is finished " message to source eNB after receiving " switch and confirm " message that UE sends, notification source eNB handoff procedure is finished.Source eNB receives after " switching is finished " message, and source eNB discharges to be connected with the Radio Link of UE and stops UE transmission data, and the data that will also not be transmitted to target eNB continue to finish forwarding, and the buffer area that empties the forwarding data.
Step S1016b, target eNB send " renewal of UE position " message to MME/UPE after receiving " switch and confirm " message that UE sends, MME/UPE is after receiving this message, and routing update and the beginning of finishing UE send user data to target eNB.
The handoff procedure of preferred version four according to the present invention, the transmission rule of user side data between MME/UPE, source eNB/ target eNB and UE is as follows:
1, at UE before " switch and confirm " message that target eNB sends, send to source eNB from the user data of MME/UPE, through the air interface between source eNB and the UE user data is sent to corresponding UE then.
2, at source eNB after UE sends " switching indication " message, set up the user side data passage by X2 interface between source eNB and the target eNB, be used for source eNB also is not transmitted to target eNB by the correct user data that receives of UE from source eNB, buffer memory in target eNB guarantees the harmless transmission of data in the handoff procedure.These data are also simultaneously by the shared data Channel Transmission between source eNB and the UE.
3, at UE after " switch and confirm " message that target eNB sends, and after the time delay that the release that source eNB is given is connected with source eNB Radio Link regularly arrives, the Radio Link that the UE side has discharged between source eNB and the UE connects, UE no longer receives the data from source eNB, while sets up in the UE side and is connected with the Radio Link of target eNB, and beginning sends upstream data and prepares the downlink data of reception from target eNB to target eNB.
4, after the time delay that eNB given release in source is connected with source eNB Radio Link regularly arrives, discharged with the Radio Link of UE in source eNB side and to be connected.
5, after target eNB receives that source eNB sends the data sequence number SN that has correctly received, discharge the data before the SN in the target eNB buffer memory, and receive " switching and confirm " after the message of UE transmission in target eNB, be connected with the UE Radio Link in the foundation of target eNB side, finish SN transfer of data afterwards by the shared data channel between target eNB and the UE.
6, after source eNB received " switching is finished " message of target eNB transmission, source eNB was forwarded to target eNB with all remaining datas in its buffer memory, and empties the corresponding cache data.
Receive at MME/UPE that 7, MME/UPE sends to source eNB with user data before " renewal of UE position " message.
Receive at MME/UPE 8, after " renewal of UE position " message that MME/UPE finishes the path switching of UE, begins the user data of UE is sent to target eNB, through the air interface between target eNB and the UE user data is sent to UE then.
In existing LTE system direct-cut operation, HO-break duration is along with postponing the linear shortcoming that increases synchronous turn-on time, the quick switching-over control that proposes among the present invention, set up in the synchronizing process at UE and target eNB, still keep by last/descending shared data channel and source eNB between aloft the Radio Link on the interface connect and transfer of data, obtain the access parameter of target eNB until UE, this method for handover control has deducted synchronous turn-on time of decay part at the direct-cut operation of existing LTE system in break period, reduce the break period in the handoff procedure effectively, improved the performance of handoffs of mobile communication system.
In existing LTE system direct-cut operation, if the failure of the synchronizing process of UE and target eNB needs recovery again to be connected the shortcoming that causes direct-cut operation increase break period with the Radio Link of source eNB, the quick switching-over control that proposes among the present invention, set up in the synchronizing process at UE and target eNB, still keep by last/descending shared data channel and source eNB between aloft the Radio Link on the interface connect and transfer of data, obtain the access parameter of target eNB until UE, this method for handover control has been avoided recovering the process that Radio Link is connected again with source eNB behind UE and the target eNB synchronization failure, reduce the break period in the handoff procedure effectively, improved the performance of handoffs of mobile communication system.
In soft switching process general in the existing cdma system, because the air-link resources of a plurality of base stations in the Active Set that UE taken simultaneously causes the redundant waste of Radio Resource, the shortcoming that power system capacity reduces, the quick switching-over control that the present invention proposes, finish synchronizing process with target eNB at UE, obtain after the access parameter of target eNB, at first cut off and the transfer of data of source eNB on shared channel, and then set up and the wireless data transmission path of target eNB on shared channel, this method for handover control has been avoided the redundant waste of the Radio Resource in the soft switching process effectively.
The thought and the implementation process of the quick direct-cut operation control among the present invention are promptly set up in the synchronizing process at UE and target eNB, still keep being connected with the shared data channel of source eNB, reduce the break period of direct-cut operation.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a method for handover control is characterized in that, may further comprise the steps:
Step S302, target BS determine that described subscriber equipment can insert after receiving the handoff request of subscriber equipment, send switch indicating information to described subscriber equipment;
Step S304, after described subscriber equipment receives switch indicating information, do not cut off with the Radio Link of described source base station and be connected, start the process of setting up synchronously with target BS, and the user data that described source base station will just send to described subscriber equipment is forwarded to described target BS;
Step S306, after described subscriber equipment and described target BS were finished synchronous access procedure, described subscriber equipment disconnected with described source base station and being connected, and described subscriber equipment has sent the correctly data sequence number of transmission to described target BS;
Step S308, described target BS is determined the user data of described subscriber equipment is sent original position according to described data sequence number; And
Step S310, described subscriber equipment and described target BS connect and communicate.
2. method for handover control according to claim 1, it is characterized in that, in described step S304, after described subscriber equipment receives the switch indicating information of described source base station, by the data communication of maintenance of data service shared channel and described source base station, the synchronizing sequence of the described target BS of code acquisition simultaneously.
3. method for handover control according to claim 1, it is characterized in that, in described step S304, after the downlink synchronization of described subscriber equipment by sync-sequence search foundation and described target BS, described subscriber equipment is finished synchronous access procedure not cutting off under the situation about being connected with the Radio Link of source base station by Random Access Channel and target BS.
4. method for handover control according to claim 1 is characterized in that, in described step S306, described data sequence number is sent in the switch acknowledgment message of described target BS and is sent to described target BS by being added on described subscriber equipment.
5. according to each described method for handover control in the claim 1 to 4, it is characterized in that described method for handover control is used for communication network.
6. method for handover control according to claim 5 is characterized in that described communication network comprises long-term evolving network.
7. a method for handover control is characterized in that, may further comprise the steps:
Step S502, target BS determine that described subscriber equipment can insert after receiving the handoff request of subscriber equipment, send switch indicating information to described subscriber equipment;
Step S504, after described subscriber equipment receives switch indicating information, do not cut off with the Radio Link of described source base station and be connected, start the process of setting up synchronously with target BS, and the user data that described source base station will just send to described subscriber equipment is forwarded to described target BS;
Step S506, after described subscriber equipment and described target BS were finished synchronous access, described subscriber equipment disconnected with described source base station and being connected, and switches to described target BS;
Step S508, after described source base station receives the handoff completion message of described target BS transmission, sent the correctly data sequence number of transmission to described target BS, continue to transmit remaining user data, and deletion has been sent to the user data of described subscriber equipment to described target BS;
Step S510, described target BS are after receiving described data sequence number, and described target BS is determined the user data of described subscriber equipment is sent original position according to described data sequence number; And
Step S512, described subscriber equipment and described target BS communicate.
8. method for handover control according to claim 7 is characterized in that described method for handover control is used for communication network.
9. method for handover control according to claim 8 is characterized in that described communication network comprises long-term evolving network.
10. a method for handover control is characterized in that, may further comprise the steps:
Step S702, target BS determine that described subscriber equipment can insert after receiving the handoff request of subscriber equipment, send switch indicating information to described subscriber equipment;
Step S704 after described subscriber equipment receives switch indicating information, does not cut off with the Radio Link of described source base station and is connected, and the process of setting up synchronously of startup and target BS;
Step S706, after described subscriber equipment and described target BS are finished synchronous access procedure, be connected with described source base station disconnection, and send switch acknowledgment message to described source base station and described target BS respectively, after described source base station receives the source switch acknowledgment message, with just at buffer memory and the user data that is not sent to described subscriber equipment be sent to described target BS;
Step S708, described target BS is finished the switching with the network side functional entity, connects with described subscriber equipment and communicates.
11. method for handover control according to claim 10 is characterized in that, described method for handover control is used for communication network.
12. method for handover control according to claim 11 is characterized in that, described communication network comprises long-term evolving network.
13. a method for handover control is characterized in that, may further comprise the steps:
After step S902, target BS determine that subscriber equipment can insert, given Radio Link release relay information is sent to described subscriber equipment by switch indicating information;
Step S904, after described subscriber equipment is received switch indicating information, do not cut off with the Radio Link of described source base station and be connected, start the process of setting up synchronously with target BS, and described source base station is just transmitted user data in buffer memory and transmission to described target BS;
Step S906, after the described Radio Link release relay time arrives, described subscriber equipment cuts off Radio Link simultaneously with described target BS and is connected, and described source base station has sent the correctly data sequence number of transmission to described target BS, and described target BS determines that according to described data sequence number the user data of described subscriber equipment sends original position; And
Step S908, described target BS is finished the switching with the network side functional entity, connects with described subscriber equipment and communicates.
14. method for handover control according to claim 13 is characterized in that, described method for handover control is used for communication network.
15. method for handover control according to claim 14 is characterized in that, described communication network comprises long-term evolving network.
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| CN111818592A (en) * | 2019-07-31 | 2020-10-23 | 维沃移动通信有限公司 | Network switching method, network equipment and terminal |
| CN113692755B (en) * | 2019-09-17 | 2023-10-13 | Oppo广东移动通信有限公司 | Uplink retransmission processing method, electronic equipment and storage medium |
| CN114258715A (en) * | 2019-10-11 | 2022-03-29 | Oppo广东移动通信有限公司 | Switching processing method and network equipment |
| CN112437474B (en) * | 2020-11-24 | 2023-10-31 | 维沃移动通信有限公司 | Information transmission method and information transmission device |
| CN113055955A (en) * | 2021-03-11 | 2021-06-29 | 中国电子科技集团公司第五十四研究所 | Switching control device and method |
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2006
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