CN100389632C - Wireless access network system and soft switching method thereof - Google Patents
Wireless access network system and soft switching method thereof Download PDFInfo
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- CN100389632C CN100389632C CNB2004100916103A CN200410091610A CN100389632C CN 100389632 C CN100389632 C CN 100389632C CN B2004100916103 A CNB2004100916103 A CN B2004100916103A CN 200410091610 A CN200410091610 A CN 200410091610A CN 100389632 C CN100389632 C CN 100389632C
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Abstract
The present invention discloses a radio access network system which comprises a source cell base station, a target cell base station and a radio network gateway, wherein the source and the target cell base stations are used for transmitting the radio signal of a soft handoff user terminal to the radio network gateway; the radio network gateway is used for carrying out macro diversity combination on the radio signal from the source and the target cell base stations. The present invention also discloses a soft handoff realizing method for the radio access network system. The source cell base station deletes an instance of a radio interface protocol stack established for the soft handoff user terminal, and the radio network gateway establishes an instance of the radio interface protocol stack corresponding to the user terminal; the source and the target cell base stations transmit the received radio signal to the radio network gateway, and the macro diversity combination is carried out on the received radio signal by the radio network gateway. The system and the method of the present invention simplifies a soft handoff process in the radio access network, reduces the occupation rate of radio transmission resources, and reduces a data transmission time delay in the radio access network.
Description
Technical field
The present invention relates to the Radio Access Network technical field in the radio communication, be specifically related to the soft handover method of a kind of wireless access network system and realization thereof.
Background technology
Along with development of Communication Technique, wireless access network is by constantly evolution, wherein a kind of wireless access network of evolution mode gained as shown in Figure 1, Fig. 1 is the wireless access network system figure in a kind of wireless network of prior art.Wherein, wireless access network is made up of one or several radio network netgate (RNG), one or several base station node B, and RNG and Node B are the annexation of multi-to-multi.For simplicity, all only comprise a RNG, two Node B among each figure of the present invention.
Among Fig. 1, RNG 101 links to each other by the Iu interface with CN 100, RNG 101 links to each other by the Iu interface with Node B 102, Node B 103, and Node B 102, Node B 103 can communicate by letter with UE by Radio Link, links to each other by the Iur interface between Node B 102 and the Node B 103.
Do not have the Radio interface protocols stack among the RNG 101, promptly Radio interface protocols stack such as PDCP/BMC/RLC/MAC then has the Radio interface protocols stack among Node B 102, the Node B 103.This just makes RNG 101 can only finish the functions such as forwarding of system broadcasts, paging, RANAP/RNSAP message, and can not carry out operations such as Radio Resource control relevant with the Radio interface protocols stack and management; Comparatively speaking, Node B 102, Node B 103 can also finish operations such as Radio Resource control relevant with the Radio interface protocols stack and management except the exchange that can finish wireless signal spread spectrum, modulation, coding, baseband signal and radiofrequency signal.
When using above-mentioned wireless access network, the flow process that relevant grand diversity merges (MDC) in the UE soft switching process as shown in Figure 2, the MDC flow chart when Fig. 2 is prior art subscriber equipment soft handover, this flow process may further comprise the steps:
Step 201:UE periodically receives the pilot signal of its all sub-districts that can receive, and sends the pilot measurement message that comprises above-mentioned pilot signal to source cell base station.When the pilot signal of certain sub-district that above-mentioned pilot measurement message is comprised reaches certain intensity, source cell base station then with described sub-district as Target cell, and to this target cell base station transmission Radio Link foundation request, this request comprises the channel parameters such as radio configuration that source cell base station is the wireless channel of UE distribution.
Above-mentioned source cell base station knows that method that whether described pilot signal reach certain intensity normally: set in advance a pilot signal strength threshold value in the source cell base station, if the intensity of above-mentioned pilot signal has surpassed this threshold value, source cell base station thinks that then this pilot signal has reached certain intensity; Otherwise source cell base station thinks that then this pilot signal does not reach certain intensity.
Step 202: receive the target cell base station that Radio Link is set up request, the channel parameters such as radio configuration that comprise according to this request are wireless channel of the new distribution of UE;
After target cell base station has been set up above-mentioned Radio Link and this channel configuration has been fed back to source cell base station, source cell base station sends activating set updating message to UE, after UE receives this message, the Active Set of self preserving is upgraded, that is: be that the above-mentioned wireless channel that UE distributes adds in the described Active Set with Target cell, and to insert target cell base station be the newly assigned wireless channel of UE.
Like this, target cell base station has just been set up Radio Link with UE.Afterwards, target cell base station sends to source cell base station by the interface between self and source cell base station with the UE wireless signal that receives.
Step 203: the UE wireless signal that source cell base station receives self is operated with carry out MDC from the UE of target cell base station wireless signal, so that the wireless signal strength of UE is improved.
Step 204-205: the UE wireless signal that source cell base station will be finished the MDC operation sends to RNG; The UE wireless signal of finishing merging that RNG will receive again sends to CN.
CN carries out respective handling to this signal after receiving above-mentioned UE wireless signal.As: as described in signal be service request, CN is then according to this signal allocation corresponding radio resource and carry out follow-up corresponding operating.
If above-mentioned relevant MDC operation incorporated in the wireless access network then as shown in Figure 3, Fig. 3 is the MDC schematic diagram in a kind of wireless access network of prior art.As seen from Figure 3, after UE 304 inserts target Node B 303, just keep wireless connections respectively with source Node B 302, target Node B 303.At this moment, relevant MDC operation is divided into following steps:
Step a: target Node B 303 sends to source Node B 302 by the interface of 302 of self and source Node B with UE 304 wireless signals that receive.
Step b: UE 304 wireless signals that source Node B 302 receives self with carry out MDC operation from the UE of target Node B 303 304 wireless signals, and UE 304 wireless signals that will finish merging send to RNG 301.
The UE that finishes merging 304 wireless signals that step c:RNG 301 will receive send to CN300.
By the aforesaid operations among Fig. 3 and the operation among Fig. 2 all as can be known, when the application prior art is carried out soft handover, the MDC operation must be undertaken by source Node B 302, this makes that too much system link transfer resource is occupied, and then increased the weight of between source Node B 302 and the CN 300, the transmission link load between source Node B 302 and the target Node B 303, and because the ratio that this link accounts in whole network is very big, the increase of therefore this transmission link load means huge investment for operator.
In addition, source Node B 302 carries out the mode of MDC operation, be too dependent on the interface between source Node B 302 and the target Node B 303, if this interface breaks down, or do not support the present ongoing business of UE, relevant MDC operation during the UE soft handover also can run into problem as shown in Figure 4, and Fig. 4 is the MDC schematic diagram in the another kind of wireless access network of prior art.
Among Fig. 4, fault has appearred in " X " expression source Node B402 between source Node B 402 and the target Node B 403 and the interface between the target Node B 403, perhaps this interface is not supported the present ongoing business of UE, as: above-mentioned interface can't satisfy the needed bandwidth of the ongoing business of UE, causes source Node B 402 and the target Node B 403 each other can't direct communication.
After UE 404 inserts target Node B 403, just keep wireless connections respectively with source Node B 402, target Node B 403.At this moment, relevant MDC operation is divided into following steps:
Step a: target Node B 403 wishes by the interface of 402 of self and source Node B UE 404 wireless signals that receive to be sent to source Node B 402, but because source Node B 402 and target Node B 403 each other can't direct communications, so source Node B 402 can only communicate by letter with target Node B 403 by RNG 401, that is: target Node B 403 sends to RNG 401 with UE 404 wireless signals that receive.
Step b:RNG 401 sends to source Node B 402 with UE 404 wireless signals that receive.
Step c: UE 404 wireless signals that source Node B 402 receives self with carry out MDC operation from the UE of RNG 401 404 wireless signals, and UE 404 wireless signals that will finish merging send to RNG 401.
The UE that finishes merging 404 wireless signals that steps d: RNG 401 will receive send to CN400.
By aforesaid operations as seen, when the interface between source Node B 402 and the target Node B 403 broke down, the MDC of UE 404 soft handovers operation was too complicated, and a large amount of transfer resources have been wasted, and cause the transmission link cost of investment too high; Too complicated MDC operation has also increased the weight of the live load of source Node B 402 and RNG 401, and causes wireless access network to produce data transmission delay.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of wireless access network system, to simplify the soft handoff procedure in the wireless access network, reduces the occupancy of wireless transmission resources, reduces the data transmission delay in the wireless access network.
Another object of the present invention is to provide a kind of soft handover method of wireless access network system realization,, reduce the occupancy of wireless transmission resources, reduce the data transmission delay in the wireless access network to simplify the soft handoff procedure in the wireless access network.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of wireless access network system, this system comprises:
Source cell base station, being used for when carrying out soft handover with the user terminal that self keeps wireless connections sending grand diversity to radio network netgate merges and moves request, when receiving after moving response in the grand diversity merging of radio network netgate, delete self once be above-mentioned user terminal set up with the corresponding Radio interface protocols stack of this user terminal soft handover example, afterwards, the above-mentioned user terminal wireless signal that receives is sent to radio network netgate;
Target cell base station is used for setting up wireless connections with above-mentioned user terminal, and this user terminal wireless signal that will receive sends to above-mentioned radio network netgate;
Radio network netgate, link to each other with target cell base station with source cell base station, be used for receive above-mentioned grand diversity merge move request after, set up and the corresponding Radio interface protocols stack of above-mentioned user terminal soft handover example, and will carry out grand diversity merging from the described user terminal wireless signal of above-mentioned base station.
The interface that radio network netgate links to each other with described source, target cell base station is the Iu interface.
The invention also discloses the soft handover method that a kind of wireless access network system is realized, this method may further comprise the steps:
A. source cell base station judges that the user terminal that receives is in the pilot measurement message of its transmission, whether include the district pilots signal and reach predefined strength threshold value, if, then with this sub-district as Target cell, and in the corresponding grand diversity merging of radio network netgate transmission and soft handover user terminal, move request, after radio network netgate is received and is moved request on this, set up and the corresponding Radio interface protocols stack of above-mentioned user terminal soft handover example, and send grand diversity to source cell base station and merge and move response, after source cell base station is received and is moved response on this, delete self once set up for above-mentioned user terminal with the corresponding Radio interface protocols stack of this user terminal soft handover example;
And, target cell base station set up with above-mentioned user terminal between wireless connections, also set up and above-mentioned radio network netgate between transmission link, source cell base station is set up the transmission link that self arrives between the above-mentioned radio network netgate;
B. the above-mentioned soft handover user terminal wireless signal that respectively self received of source, target cell base station sends to described radio network netgate; This radio network netgate carries out grand diversity to this soft handover user terminal wireless signal that receives and merges.
Among the step a, target cell base station set up described user terminal via target cell base station to the transmission link of described radio network netgate, and source cell base station is set up self and is comprised to the method for the transmission link of described radio network netgate:
A1. described radio network netgate sends Radio Link to source, target cell base station and sets up request; After source cell base station receives that this Radio Link is set up request, the transmission link between foundation and the described radio network netgate; After target cell base station receives that this Radio Link is set up request, for described user terminal distributes wireless channel, and the transmission link between foundation and the described radio network netgate;
A2. target cell base station is after above-mentioned user terminal distributes wireless channel, sends Radio Link to radio network netgate and sets up response; After this radio network netgate is received this response, send the activating set updating order to this user terminal by described source cell base station; After this user terminal was received this activating set updating order, inserting above-mentioned target cell base station was the described wireless channel that user terminal distributes, and upgraded the Active Set of self preserving.
Among the step b, if the soft handover user terminal carries out More Soft Handoff in cell-of-origin and/or Target cell, then described source, target cell base station to the method that described radio network netgate sends the user terminal wireless signal are:
The above-mentioned user terminal wireless signal that source cell base station and/or target cell base station receive self carries out softer merging, and the user terminal wireless signal that will finish softer merging again sends to above-mentioned radio network netgate.
Among the step b, if the soft handover user terminal carries out More Soft Handoff in cell-of-origin and/or Target cell, then described source, target cell base station to the method that described radio network netgate sends the user terminal wireless signal are:
The above-mentioned user terminal wireless signal that source cell base station and/or target cell base station receive self directly sends to above-mentioned radio network netgate.
Among the step b, after radio network netgate was finished described grand diversity merging, the user terminal wireless signal that further will finish merging sent to core net.
Among the step b, if in the pilot measurement message that radio network netgate receives, when the district pilots signal that is comprised was reduced to a certain degree, this method further comprised:
Above-mentioned radio network netgate sends link to described cell base station and discharges request; This cell base station is released to described user terminal assigned radio resource after receiving this release request.
After if described cell base station is released to described user terminal assigned radio resource, this user terminal only keeps wireless connections with a cell base station by a wireless links, and this method further may further comprise the steps:
Described radio network netgate sends grand diversity to current cell base station with user terminal maintenance wireless connections and merges the request that moves down;
After this cell base station is received this request, be that above-mentioned user terminal sets up the Radio interface protocols stack example of handling its follow-up traffic operation, and return grand diversity to described radio network netgate and merge and move down response;
This radio network netgate is deleted the respective wireless protocol stack of the interface example of self once setting up for above-mentioned user terminal after receiving that grand diversity merging moves down response.
Compared with prior art, in the wireless access network system provided by the present invention, source cell base station is used to delete the Radio interface protocols stack example of setting up into the soft handover user terminal, and the soft handover user terminal wireless signal that receives is sent to radio network netgate; The soft handover user terminal wireless signal that target cell base station is used for receiving sends to radio network netgate; Radio network netgate then is used to set up the Radio interface protocols stack example of above-mentioned user terminal correspondence, and the above-mentioned wireless signal from source, target cell base station is carried out grand diversity merge, simplified the soft handoff procedure in the wireless access network, reduce the occupancy of wireless transmission resources, reduce the data transmission delay in the wireless access network.
The soft handover method that wireless access network system provided by the present invention is realized, when user terminal carries out soft handover, Signalling exchange through source cell base station and radio network netgate, the Radio interface protocols stack example that the source cell base station deletion is set up for the soft handover user terminal, radio network netgate is set up the Radio interface protocols stack example of above-mentioned user terminal correspondence; And target cell base station is set up the wireless connections with above-mentioned user terminal; The described user terminal wireless signal that source, target cell base station will receive sends to radio network netgate, carrying out grand diversity by this radio network netgate merges, simplified the soft handoff procedure in the wireless access network, reduce the occupancy of wireless transmission resources, reduce the data transmission delay in the wireless access network.
Description of drawings
Fig. 1 is the wireless access network system figure in a kind of wireless network of prior art;
MDC flow chart when Fig. 2 is prior art subscriber equipment soft handover;
Fig. 3 is the MDC schematic diagram in a kind of wireless access network of prior art;
Fig. 4 is the MDC schematic diagram in the another kind of wireless access network of prior art;
The MDC flow chart of Fig. 5 during for subscriber equipment soft handover of the present invention;
Fig. 6 is the MDC schematic diagram in the wireless access network of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments to the detailed description of the invention.
In the wireless access network system provided by the present invention, source cell base station is used to delete the Radio interface protocols stack example of setting up into the soft handover user terminal, and the soft handover user terminal wireless signal that receives is sent to radio network netgate; The soft handover user terminal wireless signal that target cell base station is used for receiving sends to radio network netgate; Radio network netgate then is used to set up the Radio interface protocols stack example of above-mentioned user terminal correspondence, and the above-mentioned wireless signal from source, target cell base station is carried out grand diversity merging.
The soft handover method that wireless access network system provided by the present invention is realized, when user terminal carries out soft handover, Signalling exchange through source cell base station and radio network netgate, the Radio interface protocols stack example that the source cell base station deletion is set up for the soft handover user terminal, radio network netgate is set up the Radio interface protocols stack example of above-mentioned user terminal correspondence; And target cell base station is set up the wireless connections with above-mentioned user terminal; The described user terminal wireless signal that source, target cell base station will receive sends to radio network netgate, carries out grand diversity by this radio network netgate and merges.
RNG in the wireless access network system of the present invention, except finishing the functions such as forwarding of system broadcasts, paging, RANAP/RNSAP message, can also carry out operations such as the control of Radio Resource and management, make the MDC operation that RNG still can be correlated with according to respective request when the UE soft handover.
Referring to Fig. 5, the MDC flow chart of Fig. 5 during for subscriber equipment soft handover of the present invention, this flow process may further comprise the steps:
Step 501:UE periodically receives the pilot signal of its all sub-districts that can receive, and sends the pilot measurement message that comprises above-mentioned pilot signal strength to source cell base station.When the pilot signal of certain sub-district that above-mentioned pilot measurement message is comprised reaches certain intensity, source cell base station then with described sub-district as Target cell, and on RNG sends MDC, move request.Certainly, above-mentioned Target cell and cell-of-origin are two sub-districts that covered by the different base station wireless signal respectively.
Above-mentioned source cell base station knows that method that whether described pilot signal reach certain intensity normally: set in advance a pilot signal strength threshold value in the source cell base station, if the intensity of above-mentioned pilot signal has surpassed this threshold value, source cell base station thinks that then this pilot signal has reached certain intensity; Otherwise source cell base station thinks that then this pilot signal does not reach certain intensity.
The request of moving on described comprises the Radio interface protocols stack configuration information of relevant UE soft handover in the source cell base station, as: whether retransmit when data transmission format, message transmission rate, data transmission fault etc.; Move on above-mentioned and also comprise the channel parameters such as radio configuration that source cell base station is the wireless channel of UE distribution in the request.
After step 502:RNG received and moves request on this MDC, according to the described configuration information that comprises in the request, newly-built one and the corresponding Radio interface protocols stack of UE soft handover example were with operations such as the Radio Resource control in the follow-up soft switching process of processing UE, management.Afterwards, RNG sends on the MDC to source cell base station and moves response.
RNG receives when moving request on the above-mentioned MDC, also sends Radio Link to source, target cell base station respectively and sets up request, and the request source cell base station is established to the Radio Link of RNG; The request target cell base station is set up UE through the Radio Link of target cell base station to RNG.
Step 503: after source cell base station receives and moves response on the above-mentioned MDC, delete self once set up for UE with the corresponding Radio interface protocols stack of UE soft handover example, make source cell base station not handle operations such as Radio Resource control in the follow-up soft switching process of UE, management.
Target cell base station receives after described Radio Link sets up request, sets up the transmission link between self and the RNG, and be that UE is new distribute a wireless channel, returns Radio Link to RNG again and sets up and respond; RNG responds according to this, send the activating set updating order by source base station to UE, after UE received this order, inserting Target cell was the newly assigned wireless channel of UE, and the Active Set that self preserves upgraded, that is: be that the above-mentioned wireless channel that UE distributes adds in the above-mentioned Active Set with Target cell.
After source cell base station receives that above-mentioned Radio Link is set up request, set up the Radio Link between self and the RNG.
Step 504: behind the completing steps 503, target cell base station has just been set up Radio Link with UE, has also set up Radio Link with RNG.
Afterwards, target cell base station sends to RNG with the UE wireless signal that receives.
Equally, source cell base station has also been set up Radio Link with RNG when keeping wireless connections with UE.
Afterwards, source cell base station sends to RNG with the UE wireless signal that receives.
Step 505:RNG to receive from the source, the UE wireless signal of target cell base station carries out the MDC operation.
The UE wireless signal that step 506:RNG will finish the MDC operation sends to CN.
CN carries out respective handling to this signal after receiving above-mentioned UE wireless signal.As: as described in signal be service request, CN is then according to this signal allocation corresponding radio resource and carry out follow-up corresponding operating.
If will move on the above-mentioned relevant MDC that operation incorporates in the wireless access network then as shown in Figure 6, Fig. 6 is the MDC schematic diagram in the wireless access network of the present invention.Wherein, RNG 601 links to each other by the Iu interface with CN 600, RNG 601 links to each other by the Iu interface with source Node B 602, target Node B 603, source Node B 602, target Node B 603 can communicate by letter with UE 604 by Radio Link, link to each other by the Iur interface between source NodeB 602, the target Node B 603.
As seen from Figure 6, after UE 604 inserts target Node B 603, just keep wireless connections respectively with source Node B 602, target Node B 603.In addition, since source Node B 602 deleted self once for UE 604 that set up with the corresponding Radio interface protocols stack of UE soft handover example, so source Node B 602 does not handle operations such as Radio Resource control in the UE 604 follow-up soft switching process, management.And RNG 601 is because newly-built and the corresponding Radio interface protocols stack of UE soft handover example, then can handle operations such as Radio Resource control in the UE 604 follow-up soft switching process, management.
At this moment, the relevant MDC operation during UE 604 soft handovers is divided into following steps:
The wireless signal of the UE 604 that step a: source Node B 602 and target Node B 603 receive self respectively sends to RNG 601.
The UE wireless signal from source Node B 602 and target Node B 603 that 601 couples of step b:RNG receive carries out MDC operation, and the UE wireless signal that will finish the MDC operation sends to CN 600.
As seen from Figure 6, the MDC operation during relevant UE soft handover of the present invention only needed for two steps just can finish, and at this moment UE and source, target cell base station all keep wireless connections, and it also may be a plurality of that described target cell base station may be one; Simultaneously, UE is also in the pilot signal that periodically receives its all sub-districts that can receive, and sends the pilot measurement message that comprises above-mentioned pilot signal to RNG by source cell base station.
Along with moving of UE, the pilot signal of certain sub-district that might UE receives just progressively weakens.When the pilot signal strength of judging certain sub-district that this pilot measurement message comprised as RNG is reduced to a certain degree, just send the link release message to this cell base station; After this cell base station is received this release message, just be released to the UE assigned radio resource.Meanwhile, RNG sends activating set updating message to UE, after UE receives this message, self Active Set is carried out corresponding renewal: the cell ID that no longer keeps wireless connections in the deletion Active Set with UE.
Behind the above-mentioned Radio Resource releasing operation of one or many, UE finally may be only keeps wireless connections with its cell base station that can receive strong waveguide frequency signal, and this moment UE Active Set in also only preserve a wireless channel of a sub-district, that is: activate to concentrate on and have a wireless links.
When only having a wireless links in the Active Set of RNG discovery UE, send MDC to this Radio Link corresponding district base station and move down request, it is the configuration information that Radio interface protocols stack example that UE sets up is comprised that this MDC request of moving down comprises RNG, as: configuration parameter information such as whether retransmit when data transmission format, message transmission rate, data transmission fault.
After described cell base station received that above-mentioned MDC moves down request, the parameters such as configuration information that comprise according to this request were that UE sets up corresponding Radio interface protocols stack example, to guarantee that cell base station can carry out normal process to the follow-up traffic operation of UE.Simultaneously, this cell base station sends MDC to RNG and moves down response.After RNG receives that this MDC moves down response, delete the respective wireless protocol stack of the interface example of self once setting up for UE.
In the above-described soft switching process, UE only keeps being connected by a wireless links with source cell base station.Yet, when UE strides the More Soft Handoff of sector in the cell-of-origin, keep being connected by multi wireless links and source cell base station.At this moment the soft handover method soft handover method shown in Figure 5 of comparing just has some differences.
Above-mentioned difference is: when source cell base station and RNG have set up transmission link; And target cell base station and UE have set up Radio Link, have also set up after the transmission link with RNG, and source cell base station by the multi wireless links reception that links to each other with the UE wireless signal from UE, is carried out softer merging with these wireless signals earlier again.
Afterwards, the source cell base station UE wireless signal that will finish softer merging sends to RNG; And target cell base station sends to RNG with the UE wireless signal that receives; RNG finishes the UE wireless signal of softer merging and carries out the MDC operation from the UE of target cell base station wireless signal the above-mentioned source cell base station that receives again.
Certainly,, in Target cell, stride the More Soft Handoff of sector again, make target cell base station keep wireless connections by multi wireless links and UE if UE is after switching to Target cell.So, set up transmission link as source cell base station and RNG; And target cell base station and UE have set up Radio Link, have also set up after the transmission link with RNG, and target cell base station is also wanted earlier again these wireless signals to be carried out softer merging by the multi wireless links reception that links to each other with the UE wireless signal from UE.
Afterwards, the source cell base station UE wireless signal that will finish softer merging sends to RNG; And the UE wireless signal that target cell base station will be finished softer merging sends to RNG; RNG carries out the MDC operation to the above-mentioned source that receives, the UE wireless signal that target cell base station is finished softer merging again.
By the above as seen, when UE has under the situation of above-mentioned More Soft Handoff during at soft handover, source and/or target cell base station can be carried out softer merging with the UE wireless signal that receives separately earlier, the UE wireless signal that to finish softer merging again sends to RNG, carry out follow-up MDC operation by RNG, concrete therebetween signaling process is identical with the described signaling process principle of Fig. 5, does not repeat them here.
In fact, source and/or target cell base station can be not be carried out softer merging to the UE wireless signal of the multi wireless links that receives yet, but respectively this UE wireless signal is sent to RNG, directly its all UE wireless signals that receive are carried out the MDC operation by RNG, concrete therebetween signaling process is identical with the described signaling process principle of Fig. 5, does not repeat them here.
By the above as can be seen, the soft handover method of wireless access network system provided by the present invention and realization thereof has been simplified the soft handoff procedure in the wireless access network, reduces the occupancy of wireless transmission resources, reduces the data transmission delay in the wireless access network.The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a wireless access network system is characterized in that, this system comprises:
Source cell base station, being used for when carrying out soft handover with the user terminal that self keeps wireless connections sending grand diversity to radio network netgate merges and moves request, when receiving after moving response in the grand diversity merging of radio network netgate, delete self once be above-mentioned user terminal set up with the corresponding Radio interface protocols stack of this user terminal soft handover example, afterwards, the above-mentioned user terminal wireless signal that receives is sent to radio network netgate;
Target cell base station is used for setting up wireless connections with above-mentioned user terminal, and this user terminal wireless signal that will receive sends to above-mentioned radio network netgate;
Radio network netgate, link to each other with target cell base station with source cell base station, be used for receive above-mentioned grand diversity merge move request after, set up and the corresponding Radio interface protocols stack of above-mentioned user terminal soft handover example, and will carry out grand diversity merging from the described user terminal wireless signal of above-mentioned base station.
2. the system as claimed in claim 1 is characterized in that, the interface that radio network netgate links to each other with described source, target cell base station is the Iu interface;
3. the soft handover method realized of a wireless access network system is characterized in that this method may further comprise the steps:
A. source cell base station judges that the user terminal that receives is in the pilot measurement message of its transmission, whether include the district pilots signal and reach predefined strength threshold value, if, then with this sub-district as Target cell, and in the corresponding grand diversity merging of radio network netgate transmission and soft handover user terminal, move request, after radio network netgate is received and is moved request on this, set up and the corresponding Radio interface protocols stack of above-mentioned user terminal soft handover example, and send grand diversity to source cell base station and merge and move response, after source cell base station is received and is moved response on this, delete self once set up for above-mentioned user terminal with the corresponding Radio interface protocols stack of this user terminal soft handover example;
And, target cell base station set up with above-mentioned user terminal between wireless connections, also set up and above-mentioned radio network netgate between transmission link, source cell base station is set up the transmission link that self arrives between the above-mentioned radio network netgate;
B. the above-mentioned soft handover user terminal wireless signal that respectively self received of source, target cell base station sends to described radio network netgate; This radio network netgate carries out grand diversity to this soft handover user terminal wireless signal that receives and merges.
4. method as claimed in claim 3, it is characterized in that, among the step a, target cell base station set up described user terminal via target cell base station to the transmission link of described radio network netgate, and source cell base station is set up self and is comprised to the method for the transmission link of described radio network netgate:
A1. described radio network netgate sends Radio Link to source, target cell base station and sets up request; After source cell base station receives that this Radio Link is set up request, the transmission link between foundation and the described radio network netgate; After target cell base station receives that this Radio Link is set up request, for described user terminal distributes wireless channel, and the transmission link between foundation and the described radio network netgate;
A2. target cell base station is after above-mentioned user terminal distributes wireless channel, sends Radio Link to radio network netgate and sets up response; After this radio network netgate is received this response, send the activating set updating order to this user terminal by described source cell base station; After this user terminal was received this activating set updating order, inserting above-mentioned target cell base station was the described wireless channel that user terminal distributes, and upgraded the Active Set of self preserving.
5. method as claimed in claim 3, it is characterized in that, among the step b, if the soft handover user terminal carries out More Soft Handoff in cell-of-origin and/or Target cell, then described source, target cell base station to the method that described radio network netgate sends the user terminal wireless signal are:
The above-mentioned user terminal wireless signal that source cell base station and/or target cell base station receive self carries out softer merging, and the user terminal wireless signal that will finish softer merging again sends to above-mentioned radio network netgate.
6. method as claimed in claim 3, it is characterized in that, among the step b, if the soft handover user terminal carries out More Soft Handoff in cell-of-origin and/or Target cell, then described source, target cell base station to the method that described radio network netgate sends the user terminal wireless signal are:
The above-mentioned user terminal wireless signal that source cell base station and/or target cell base station receive self directly sends to above-mentioned radio network netgate.
7. method as claimed in claim 3 is characterized in that, among the step b, after radio network netgate was finished described grand diversity merging, the user terminal wireless signal that further will finish merging sent to core net.
8. as each described method of claim 3 to 7, it is characterized in that among the step b, if in the pilot measurement message that radio network netgate receives, when the district pilots signal that is comprised was reduced to a certain degree, this method further comprised:
Above-mentioned radio network netgate sends link to described cell base station and discharges request; This cell base station is released to described user terminal assigned radio resource after receiving this release request.
9. method as claimed in claim 8, it is characterized in that, after if described cell base station is released to described user terminal assigned radio resource, this user terminal only keeps wireless connections with a cell base station by a wireless links, and this method further may further comprise the steps:
Described radio network netgate sends grand diversity to current cell base station with user terminal maintenance wireless connections and merges the request that moves down;
After this cell base station is received this request, be that above-mentioned user terminal sets up the Radio interface protocols stack example of handling its follow-up traffic operation, and return grand diversity to described radio network netgate and merge and move down response;
This radio network netgate is deleted the respective wireless protocol stack of the interface example of self once setting up for above-mentioned user terminal after receiving that grand diversity merging moves down response.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100916103A CN100389632C (en) | 2004-11-24 | 2004-11-24 | Wireless access network system and soft switching method thereof |
| PCT/CN2005/001987 WO2006056127A1 (en) | 2004-11-24 | 2005-11-24 | A radio access network system and a method for realizing handover thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100916103A CN100389632C (en) | 2004-11-24 | 2004-11-24 | Wireless access network system and soft switching method thereof |
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| Publication Number | Publication Date |
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| CN1780475A CN1780475A (en) | 2006-05-31 |
| CN100389632C true CN100389632C (en) | 2008-05-21 |
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| CNB2004100916103A Expired - Fee Related CN100389632C (en) | 2004-11-24 | 2004-11-24 | Wireless access network system and soft switching method thereof |
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| Country | Link |
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| CN (1) | CN100389632C (en) |
| WO (1) | WO2006056127A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101374325B (en) * | 2007-08-23 | 2012-04-04 | 电信科学技术研究院 | Method and system for implementing district switch by mobile terminal |
| CN100562176C (en) * | 2007-11-13 | 2009-11-18 | 北京北方烽火科技有限公司 | A kind of MIMO technology travelling carriage that utilizes is dominated changing method in the mobile communication system |
| CN101742553B (en) * | 2008-11-04 | 2012-08-29 | 上海华为技术有限公司 | Processing method and device during service cell switching |
| CN104349451B (en) * | 2013-08-09 | 2019-03-22 | 电信科学技术研究院 | A kind of method and apparatus synchronized |
| CN113518401B (en) | 2018-11-27 | 2022-11-22 | Oppo广东移动通信有限公司 | Wireless communication method, terminal equipment and network equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020045447A1 (en) * | 1999-01-25 | 2002-04-18 | Juha Rasanen | Interworking between radio access networks |
| CN1416284A (en) * | 2001-10-26 | 2003-05-07 | 三星电子株式会社 | Mobile communicating system and method realizing overzone switching |
| CN1540999A (en) * | 2003-04-24 | 2004-10-27 | 普天信息技术研究院 | Access method and system for a wireless access network |
-
2004
- 2004-11-24 CN CNB2004100916103A patent/CN100389632C/en not_active Expired - Fee Related
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2005
- 2005-11-24 WO PCT/CN2005/001987 patent/WO2006056127A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020045447A1 (en) * | 1999-01-25 | 2002-04-18 | Juha Rasanen | Interworking between radio access networks |
| CN1416284A (en) * | 2001-10-26 | 2003-05-07 | 三星电子株式会社 | Mobile communicating system and method realizing overzone switching |
| CN1540999A (en) * | 2003-04-24 | 2004-10-27 | 普天信息技术研究院 | Access method and system for a wireless access network |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006056127A1 (en) | 2006-06-01 |
| CN1780475A (en) | 2006-05-31 |
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