CN100387097C - Soft switching method - Google Patents
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- CN100387097C CN100387097C CNB2004101035748A CN200410103574A CN100387097C CN 100387097 C CN100387097 C CN 100387097C CN B2004101035748 A CNB2004101035748 A CN B2004101035748A CN 200410103574 A CN200410103574 A CN 200410103574A CN 100387097 C CN100387097 C CN 100387097C
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Abstract
The present invention discloses a soft handoff method. An evolved source cell base station deletes an instance of a radio interface protocol stack established for a soft handoff user terminal, and a radio network gateway establishes an instance of the radio interface protocol stack corresponding to the user terminal on the radio network gateway. The evolved source cell base station transmits the received radio signal to the radio network gateway, and a target cell base station which is not evolved establishes radio connection with the user terminal; the received radio signal of the user terminal is transmitted to the radio network gateway through a radio network controller to which the received radio signal of the user terminal belongs, and macro diversity combination is carried out on the received radio signals transmitted from the source and the target cell base station by the radio network gateway. The processes of the user equipment soft handoff from an evolved radio access network to a radio access network which is not evolved are simplified by using the present invention, which reduces the occupancy rate of radio transmission resources and a data transmission time delay in the radio access network.
Description
Technical field
The present invention relates to the wireless access network technology in the communication network, be specifically related to a kind of soft handover method.
Background technology
The wireless network of widespread usage totally is made up of wireless access network and core net at present, wherein, wireless access network is made up of one or several RNS (RNS Radio Network Subsystem) usually, and RNS comprises a radio network controller (RNC), one or several base station node B.Wireless access network system in the wireless network as shown in Figure 1, Fig. 1 is the wireless access network system figure in a kind of wireless network of prior art.
Wherein, establish the Radio interface protocols stack among the RNC, i.e. Radio interface protocols stack such as PDCP/BMC/RLC/MAC.This makes RNC finish the functions such as forwarding of system broadcasts, paging, Radio Resource control and management, wireless access network application protocol (RANAP)/RNS application protocol (RNSAP) message; Then there is not described Radio interface protocols stack among the Node B, i.e. Radio interface protocols stack such as PDCP/BMC/RLC/MAC.Therefore, Node B can only finish the functions such as exchange of spread spectrum, modulation, coding, baseband signal and the radiofrequency signal of wireless signal.
Along with the development of radio communication, people carry out evolution to wireless access network, wherein a kind of wireless access network of the evolution mode gained that is being carried out theoretical research as shown in Figure 2, Fig. 2 is the wireless access network system figure in the another kind of wireless network of prior art.Described wireless access network system comprises radio network netgate (RNG) and Node B+.Wherein, RNG 201 carries out evolution functional entity afterwards to RNC among Fig. 1 101, and Node B+202, Node B+203 carry out evolution functional entity afterwards to Node B 102, Node B 103 among Fig. 1.On behalf of this NodeB+, "+" among the above-mentioned Node B+ finished described evolution.
No longer have Radio interface protocols stacks such as PDCP/BMC/RLC/MAC among the RNG 201 after the evolution, RNG 201 can only finish the functions such as forwarding of system broadcasts, paging, RANAP/RNSAP message, and no longer carries out operations such as the control of Radio Resource and management; Comparatively speaking, establish Radio interface protocols stacks such as PDCP/BMC/RLC/MAC among the NodeB+ after the evolution, this makes Node B+ except the exchange of finishing wireless signal spread spectrum, modulation, coding, baseband signal and radiofrequency signal, can also finish functions such as the control of Radio Resource and management.
As seen, Node B+ after the evolution than among Fig. 1 not the function of the Node B of evolution strengthen to some extent, the function of RNG after the evolution then than among Fig. 1 not the function of the RNC of evolution weaken to some extent, this mainly is in order to make Node B+ conduct and the immediate node of subscriber equipment (UE), can finish the operation such as control, management of Radio Resource as far as possible, and then alleviate the live load of RNG, thereby effectively reduce the resources occupation rate of RNG and the probability that breaks down.
Among Fig. 2, RNG 201 links to each other by the Iu interface with CN 200.
In addition, be the annexation of multi-to-multi between Node B+ among Fig. 2 and the RNG, no longer there are fixing management and annexation between Node B+ and the RNG, that is: any one Node B+ all can link to each other with any one or a plurality of RNG.In Fig. 2, Node B+202, Node B+203 link to each other by the Iur/Iu interface with RNG 201; Between Node B+202 and the Node B+203 Iur interface is arranged usually.
In actual applications; often have the wireless access network soft handover of the wireless access network of UE after the evolution shown in Figure 2 to not evolution shown in Figure 1; certain functional entity in the wireless access network also can carry out corresponding grand diversity and merge (MDC) operation; the involved wireless access network of above-mentioned UE soft handover as shown in Figure 3, the network structure when Fig. 3 is prior art subscriber equipment soft handover.
Among Fig. 3, RNG 301, RNC 302 link to each other with CN 300 by the Iu interface respectively, and 302 of RNG 301 and RNC link to each other by the Iur interface; RNG 301 links to each other by the Iur/Iu interface with Node B+303, and RNC 302 and Node B 304 link to each other by Iub interface; Node B+303, Node B 304 can communicate by letter with UE 305 by Radio Link respectively.
UE 305 only keeps wireless connections with Node B+303 at first, and Node B+303 sends to CN 300 via RNG301 with UE 305 wireless signals that receive.CN 300 carries out respective handling to this signal after receiving the wireless signal of UE 305.As: as described in signal be service request, 300 of CN are according to this signal allocation corresponding radio resource and carry out follow-up corresponding operating.Simultaneously, UE 305 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 Node B+303.
Afterwards, along with moving of UE 305, when the pilot signal of UE 305 Node B 304 in the pilot measurement message that Node B+303 sends reached certain intensity, Node B+303 then sent Radio Link via RNG301, RNC 302 to Node B 304 and sets up request.
Above-mentioned Node B+303 knows that method that whether described pilot signal reach certain intensity normally: set in advance a pilot signal strength threshold value in the Node B+303, if the intensity of above-mentioned pilot signal has surpassed this threshold value, Node B+303 thinks that then this pilot signal has reached certain intensity; Otherwise Node B+303 thinks that then this pilot signal does not reach certain intensity.
The Node B 304 that receives Radio Link foundation request is UE 305 new wireless channels, these channels of 305 accesses of UE of distributing.Like this, Node B 304 has just set up Radio Link with UE 305.Afterwards, Node B 304 sends to Node B+303 with the wireless signal of the UE 305 that receives via RNC 302, RNG 301.The wireless signal of the UE 305 that Node B+303 receives self carries out the MDC operation with wireless signal from the UE 305 of Node B 304, so that the wireless signal strength of the UE 305 that Node B+303 receives is improved.Then, the Node B+303 wireless signal that will finish the UE 305 of MDC operation sends to RNG 301; The wireless signal of the UE that finishes merging 305 that RNG 301 will receive again sends to CN 300.After CN 300 receives the wireless signal of above-mentioned UE 305, this signal is carried out respective handling.
In the soft handover of reality was used, usually that Node B+303 is so initial and UE 305 kept the base station of wireless connections to be called source cell base station, and the wireless signal coverage of this base station then is called the cell-of-origin; And Node B 304 such UE 305 are called target cell base station in the base station of switching stylish access, the wireless signal coverage of this base station then is called Target cell.
UE in network configuration shown in Figure 3 MDC flow process during soft handover as shown in Figure 4, the MDC flow chart when Fig. 4 is prior art subscriber equipment soft handover, this flow process may further comprise the steps:
Step 401: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 the Node B+ as source cell base station.When the pilot signal of certain the Node B that is comprised when above-mentioned pilot measurement message reaches certain intensity, Node B+ then with this Node B as Target cell, and via the RNC transmission Radio Link foundation request of the RNG that links to each other with self under this Node B, this request comprises the channel parameters such as radio configuration that Node B+ is the wireless channel of UE distribution.
Above-mentioned Node B+ knows that method that whether described pilot signal reach certain intensity normally: set in advance a pilot signal strength threshold value in the NodeB+, if the intensity of above-mentioned pilot signal has surpassed this threshold value, Node B+ thinks that then this pilot signal has reached certain intensity; Otherwise Node B+ thinks that then this pilot signal does not reach certain intensity.
Step 402: receive the RNC that Radio Link is set up request, this request is sent to described NodeB, the channel parameters such as radio configuration that this Node B comprises according to this request are wireless channel of the new distribution of UE;
After Node B has set up above-mentioned Radio Link and this channel configuration has been fed back to Node B+, NodeB+ 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 Node B, and to insert Node B be the newly assigned wireless channel of UE.
Like this, Node B has just set up Radio Link with UE.Afterwards, Node B sends to Node B+ via the RNC under self, described RNG with the UE wireless signal that receives.
The UE wireless signal that step 403:Node B+ receives self is operated with carry out MDC from the UE of Node B wireless signal, so that the wireless signal strength of UE is improved.
The UE wireless signal that step 404-405:Node B+ will finish the MDC operation sends to described RNG, and this RNG again the UE wireless signal of finishing merging that receives is carried out media interviews controls (MAC) and Radio Link control upper-layer protocols such as (RLC) is handled.Wherein, the protocol processes of MAC layer is used to carry out the parameter control of data transmission channel, and the protocol processes of rlc layer is used to carry out the Data Transmission Controlling of logic channel.
Afterwards, RNG will finish the signal that upper-layer protocols such as above-mentioned MAC, RLC handle and send 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 the corresponding resource of this signal allocation and carry out follow-up corresponding operating.
If above-mentioned relevant MDC operation incorporated in the wireless access network then as shown in Figure 5, Fig. 5 is the MDC schematic diagram in the wireless access network of prior art.Among Fig. 5, after UE 505 inserts Node B 504, just keep wireless connections respectively with Node B+503, Node B 504.At this moment, relevant MDC operation is divided into following steps:
Step a:Node B 504 sends to RNC 502 under the Node B 504 with UE 505 wireless signals that receive.
Step b:RNC 502 sends to the RNG 501 that links to each other with Node B+503 with UE 505 wireless signals that receive.
What step c:RNG 501 will receive sends to Node B+503 from the UE of RNC 502 505 wireless signals.
Steps d: UE 504 wireless signals that Node B+503 receives self carry out the MDC operation with described UE 505 wireless signals that are received from RNG501, and UE 505 wireless signals that will finish merging send to RNG 501.
The UE that finishes merging 505 wireless signals that step e:RNG 501 will receive send to CN500.
By the aforesaid operations among Fig. 5 as can be known, when the application prior art is carried out soft handover, the MDC operation must be undertaken by the Node B+ as source cell base station, this makes that too much system link transfer resource is occupied, and then increased the weight of, and cause wireless access network to produce data transmission delay as the transmission link load between the Node B+ of source cell base station and the coupled RNG; 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.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of soft handover method, to simplify wireless access network the flow process when the wireless access network of not evolution carry out soft handover of subscriber equipment after by evolution, reduce the occupancy of wireless transmission resources, reduce the data transmission delay 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 soft handover method, this method may further comprise the steps:
A. source cell base station is moved request in the corresponding grand diversity merging of radio network netgate transmission and soft handover user terminal, after radio network netgate is received and is moved request on this, set up and the corresponding Radio interface protocols stack of above-mentioned soft handover user terminal 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, wireless connections between target cell base station foundation and the above-mentioned user terminal, radio network controller foundation under the target cell base station and the transmission link between this target cell base station and the above-mentioned radio network netgate, source cell base station is set up self to the transmission link between the above-mentioned radio network netgate;
B. source cell base station above-mentioned soft handover user terminal wireless signal that self is received sends to described radio network netgate, and target cell base station sends to described radio network netgate via the radio network controller under self with the user terminal wireless signal that receives; This radio network netgate carries out grand diversity to the described soft handover user terminal wireless signal that receives and merges.
Among the step a, source cell base station sends in the described grand diversity merging and moves before the request, and this method further comprises:
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 send described grand diversity to radio network netgate and merge and move request.
Among the step a, target cell base station set up and described user terminal between wireless connections, source cell base station is set up self and is comprised to the method for the transmission link between the above-mentioned radio network netgate:
A1. described radio network netgate sends request for building link to source cell base station, also sends Radio Link to target cell base station and sets up request; After source cell base station is received this request for building link, 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;
A2. target cell base station is after above-mentioned user terminal distributes wireless channel, sends Radio Link by the radio network controller under self 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 via source cell base station; After this user terminal is received this activating set updating order, upgrade the Active Set of self preserving, and insert the described wireless channel that above-mentioned target cell base station is the user terminal distribution.
Among the step a, the radio network controller foundation under the target cell base station and the method for the transmission link between this target cell base station and the described radio network netgate comprise:
The radio network controller of radio network netgate under target cell base station sends request for building link; After this radio network controller is received this request, set up the transmission link between self and this radio network netgate and self and this target cell base station.
Among the step b, if the soft handover user terminal carries out More Soft Handoff in cell-of-origin and/or Target cell, then 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 receives self carries out softer merging, and the user terminal wireless signal that will finish softer merging again sends to above-mentioned radio network netgate;
And/or the above-mentioned user terminal wireless signal that target cell base station receives self carries out softer merging, the user terminal wireless signal that to finish softer merging again sends to self affiliated radio network controller, and this radio network controller sends to described radio network netgate with this user terminal wireless signal.
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 receives self directly sends to above-mentioned radio network netgate;
And/or target cell base station directly sends to described radio network netgate via the above-mentioned user terminal wireless signal that the radio network controller under self receives self.
Among the step b, radio network netgate further carries out upper-layer protocol to the user terminal wireless signal of finishing merging and handles after finishing described grand diversity merging, sends to core net again.
Among the step b, described user terminal 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 radio network gateway by source cell base station; If in the pilot measurement message that radio network netgate receives, when the district pilots signal that is comprised was lower than the threshold value of setting, this method further comprised:
Radio network netgate sends the activating set updating request to described user terminal, and this user terminal is received the activating set updating that carries out self after this request;
Radio network netgate also is lower than the cell base station transmission link release request of the threshold value of setting to the described district pilots signal that comprises; 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 source cell base station, 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, soft handover method provided by the present invention, when the wireless access network after user terminal is by evolution carries out soft handover to the wireless access network of not evolution, the Radio interface protocols stack example that source cell base station deletion after the evolution is set up for the soft handover user terminal, radio network netgate then self is being set up the Radio interface protocols stack example of above-mentioned user terminal correspondence; The above-mentioned wireless signal that source cell base station after the evolution will receive sends to radio network netgate, the not wireless connections of foundation of the target cell base station of evolution and described user terminal, this user terminal wireless signal that will receive again sends to radio network netgate via the radio network controller under self, by this radio network netgate to receive from the source, the described wireless signal of target cell base station carries out grand diversity and merges, simplified wireless access network the flow process when the wireless access network of not evolution carry out soft handover of subscriber equipment after by evolution, reduce the occupancy of wireless transmission resources, reduced 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;
Fig. 2 is the wireless access network system figure in the another kind of wireless network of prior art;
Network structure when Fig. 3 is prior art subscriber equipment soft handover;
MDC flow chart when Fig. 4 is prior art subscriber equipment soft handover;
Fig. 5 is the MDC schematic diagram in the wireless access network of prior art;
The MDC flow chart of Fig. 6 during for subscriber equipment soft handover of the present invention;
Fig. 7 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 soft handover method provided by the invention, source cell base station merges to the corresponding grand diversity of radio network netgate transmission and soft handover user terminal moves 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 soft handover user terminal 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, wireless connections between target cell base station foundation and the above-mentioned user terminal, radio network controller foundation under the target cell base station and the transmission link between this target cell base station and the above-mentioned radio network netgate, source cell base station is set up self to the transmission link between the above-mentioned radio network netgate;
The above-mentioned soft handover user terminal wireless signal that source cell base station receives self sends to described radio network netgate, and target cell base station sends to described radio network netgate via the radio network controller under self with the user terminal wireless signal that receives; This radio network netgate carries out grand diversity to the described soft handover user terminal wireless signal that receives 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 when UE carries out soft handover, 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. 6, the MDC flow chart of Fig. 6 during for subscriber equipment soft handover of the present invention, this flow process may further comprise the steps:
Step 601: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 the Node B+ as source cell base station.When the pilot signal of certain the Node B that is comprised when above-mentioned pilot measurement message reaches certain intensity, Node B+ then with this Node B as Target cell, and send on the MDC to the RNG that links to each other with Node B+ and to move request.
Above-mentioned Node B+ knows that method that whether described pilot signal reach certain intensity normally: set in advance a pilot signal strength threshold value in the NodeB+, if the intensity of above-mentioned pilot signal has surpassed this threshold value, Node B+ thinks that then this pilot signal has reached certain intensity; Otherwise Node B+ 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 among the Node B+, 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 Node B+ is the wireless channel of UE distribution in the request.
After step 602: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 Node B+ and moves response.
RNG receives that when moving request on the above-mentioned MDC, also the RNC under Node B+ and Node B sends request for building link respectively, and request Node B+ is established to the transmission link of above-mentioned RNG; Ask above-mentioned RNC to be established to the transmission link of described RNG and Node B.And RNG also sends to Node B via this RNC and comprises the Radio Link foundation request that Node B+ is the wireless channel parameter of UE distribution, asks this Node B and described UE to set up wireless connections.
After step 603:Node B+ 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 Node B+ not handle operations such as Radio Resource control in the follow-up soft switching process of UE, management.
Node B receives after described Radio Link sets up request, and to be that UE is new distribute a wireless channel to the channel parameter that comprises according to this request, and return Radio Link to RNG and set up response; RNG responds according to this, send the activating set updating order by Node B+ to UE, after UE received this order, inserting Node B 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 Node B.
Node B+ receives after the described request for building link of RNG, sets up the data transmission link that arrives this RNG via the Iur interface of self; RNC under the Node B receives after the described request for building link of RNG, sets up the data transmission link between self and RNG, self and the Node B.
Step 604: behind the completing steps 603, Node B has just set up Radio Link with UE, and exists via the data transmission link of the RNC under self to RNG.
Afterwards, Node B sends to RNC under self with the UE wireless signal that receives, and this RNC sends to RNG with this UE wireless signal again.
Equally, Node B+ is when keeping wireless connections with UE, and also Iur interface and the RNG by self set up data transmission link.
Afterwards, Node B+ sends to RNG with the UE wireless signal that receives by self described Iur interface.
Step 605:RNG carries out the MDC operation to the UE wireless signal from Node B+, Node B that receives.
Step 606:RNG carries out upper-layer protocols such as MAC, RLC to the UE wireless signal of finishing the MDC operation to be handled.Afterwards, RNG will finish the signal that above-mentioned upper-layer protocol handles and send 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 the corresponding resource of this signal allocation and carry out follow-up corresponding operating.
In fact, in the step 603, set up via self Iur interface before the data transmission link of described RNG at described Node B+, have data transmission link between this Node B+ and this RNG, be used for the UE wireless signal that this Node B+ receives is sent to this RNG via the foundation of Iu interface.
Why want the newly-built data transmission link that arrives described RNG via the Iur interface of above-mentioned Node B+, be because the Iu interface is different with the application protocol of Iur interface support: the Iu interface is supported Radio Access Network Application Part (RANAP) agreement, and the Iur interface is supported Radio Network Subsystem Application Part (RNSAP) agreement.The processing that described RNG receives behind the UE wireless signal of supporting different agreement is also different: the UE wireless signal of the support RANAP that RNG will receive via the Iu interface is transmitted to CN; And the UE wireless signal of the support RNSAP agreement that receives via the Iur interface is carried out the MDC operation.
If will move on the above-mentioned relevant MDC that operation incorporates in the wireless access network then as shown in Figure 7, Fig. 7 is the MDC schematic diagram in the wireless access network of the present invention.Wherein, RNG 701 links to each other by the Iu interface with CN 700, and RNG 701 links to each other by the Iur/Iu interface with Node B+703, and RNC 702 and Node B 704 link to each other by Iub interface, and RNG 701 links to each other by the Iur interface with RNC 702; Node B+703, Node B 704 can communicate by letter with UE 705 by Radio Link.
As seen from Figure 7, after inserting Node B 704, UE 705 just keeps wireless connections respectively with Node B+703, Node B704.In addition and since Node B+703 deleted self once for UE 705 that set up with the corresponding Radio interface protocols stack of UE soft handover example, so Node B+703 does not handle operations such as Radio Resource control in the UE 705 follow-up soft switching process, management.And RNG 701 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 705 follow-up soft switching process, management.
At this moment, the relevant MDC operation during UE 705 soft handovers is divided into following steps:
Step a:Node B+703 sends to RNG 701 via the Iur interface of self with the wireless signal of the UE 705 that receives; The wireless signal of the UE 705 that Node B 704 receives self sends to the RNC 702 under self.
Step b:RNC 702 sends to RNG 701 with the wireless signal of the UE 705 that receives, and RNG701 carries out the MDC operation to the UE wireless signal from Node B+703 and RNC 702 that receives.
The UE wireless signal that step c:RNG 701 will finish the MDC operation sends to CN 700.
As seen from Figure 7, the MDC operation during relevant UE soft handover of the present invention only needed for three steps just can finish, at this moment UE and all keep wireless connections as the Node B+ of source cell base station and as the Node B of target cell base station.In fact, it also may be a plurality of that described target cell base station may be one, that is: UE has newly inserted one or more Node B in soft switching process; 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 Node B+.
Along with moving of UE, certain Node B that might UE receives or the pilot signal of Node B+ just progressively weaken.When the pilot signal strength of judging certain Node B that this pilot measurement message comprised or NodeB+ as RNG is reduced to a certain degree, send the activating set updating request to UE, after UE receives this request, self Active Set is carried out corresponding renewal: the pairing cell ID of pilot signal described in the deletion Active Set.Simultaneously, RNG also sends the link release message to described Node B or Node B+; After this Node B or Node B+ receive this release message, just be released to the UE assigned radio resource.
Above-mentioned RNG judge described pilot signal strength whether be reduced to a certain degree method normally: set in advance resource in the RNG and discharged threshold value, if the intensity of above-mentioned pilot signal is lower than this threshold value, RNG thinks that then this pilot signal is reduced to a certain degree; Otherwise RNG does not think that then this pilot signal is reduced to a certain degree.
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 Radio Link corresponding to a cell base station.
In the Active Set of RNG discovery UE, only there is Radio Link corresponding to a cell base station, and when described Radio Link corresponding district base station is the Node B+ of Ceng Zuowei source cell base station, just send MDC and move down request to this Node B+, 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 Node B+ 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, can carry out normal process to the follow-up traffic operation of UE to guarantee Node B+.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 is connected by wireless links maintenance with Node B+ as source cell base station.Yet, when UE strides the More Soft Handoff of sector in the cell-of-origin, keep being connected with Node B+ by multi wireless links.At this moment the soft handover method soft handover method shown in Figure 6 of comparing just has some differences.
Above-mentioned difference is: when Node B+ and RNG have set up transmission link; And Node B and UE have set up Radio Link, have also set up after the transmission link via RNC under self and RNG, and Node B+ by the multi wireless links reception that links to each other with the UE wireless signal from UE, carries out softer merging with these wireless signals earlier again.
The Node B+ UE wireless signal that will finish softer merging sends to RNG afterwards; And Node B sends to RNG via the RNC under self 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 RNC wireless signal the above-mentioned Node B+ that receives again.
Certainly, if UE is after switching to Target cell, stride the More Soft Handoff of sector again in Target cell, feasible Node B as target cell base station keeps wireless connections by multi wireless links and UE.So, set up transmission link as Node B+ and RNG; And Node B and UE have set up Radio Link, also set up transmission link via RNC under self and RNG after, Node B also wants 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.
The Node B+ UE wireless signal that will finish softer merging sends to RNG afterwards; And Node B sends to RNG via the UE wireless signal that the RNC under self will finish softer merging; RNG carries out the MDC operation to the above-mentioned Node B+ that receives, the UE wireless signal that Node B finishes softer merging again.
By the above as seen, when UE has under the situation of above-mentioned More Soft Handoff during at soft handover, can earlier the UE wireless signal that receives separately be carried out softer merging as the Node B+ of source cell base station and/or as the Node B of target cell base station, 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. 6, does not repeat them here.
In fact, the UE wireless signal of the multi wireless links that above-mentioned Node B+ and/or Node B also can not receive self carries out softer merging, 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. 6, does not repeat them here.
By the above as can be seen, soft handover method provided by the present invention, simplified wireless access network the flow process when the wireless access network of not evolution carry out soft handover of subscriber equipment after, reduced the occupancy of wireless transmission resources, reduced the data transmission delay in the wireless access network by evolution.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 soft handover method is characterized in that, this method may further comprise the steps:
A. source cell base station is moved request in the corresponding grand diversity merging of radio network netgate transmission and soft handover user terminal, after radio network netgate is received and is moved request on this, set up and the corresponding Radio interface protocols stack of above-mentioned soft handover user terminal 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, wireless connections between target cell base station foundation and the above-mentioned user terminal, radio network controller foundation under the target cell base station and the transmission link between this target cell base station and the above-mentioned radio network netgate, source cell base station is set up self to the transmission link between the above-mentioned radio network netgate;
B. source cell base station above-mentioned soft handover user terminal wireless signal that self is received sends to described radio network netgate, and target cell base station sends to described radio network netgate via the radio network controller under self with the user terminal wireless signal that receives; This radio network netgate carries out grand diversity to the described soft handover user terminal wireless signal that receives and merges.
2. the method for claim 1 is characterized in that, among the step a, source cell base station sends in the described grand diversity merging and moves before the request, and this method further comprises:
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 send described grand diversity to radio network netgate and merge and move request.
3. the method for claim 1 is characterized in that, among the step a, target cell base station set up and described user terminal between wireless connections, source cell base station is set up self and is comprised to the method for the transmission link between the above-mentioned radio network netgate:
A1. described radio network netgate sends request for building link to source cell base station, also sends Radio Link to target cell base station and sets up request; After source cell base station is received this request for building link, 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;
A2. target cell base station is after above-mentioned user terminal distributes wireless channel, sends Radio Link by the radio network controller under self 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 via source cell base station; After this user terminal is received this activating set updating order, upgrade the Active Set of self preserving, and insert the described wireless channel that above-mentioned target cell base station is the user terminal distribution.
4. the method for claim 1 is characterized in that, among the step a, the radio network controller foundation under the target cell base station and the method for the transmission link between this target cell base station and the described radio network netgate comprise:
The radio network controller of radio network netgate under target cell base station sends request for building link; After this radio network controller is received this request, set up the transmission link between self and this radio network netgate and self and this target cell base station.
5. the method for claim 1, 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 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 receives self carries out softer merging, and the user terminal wireless signal that will finish softer merging again sends to above-mentioned radio network netgate;
And/or the above-mentioned user terminal wireless signal that target cell base station receives self carries out softer merging, the user terminal wireless signal that to finish softer merging again sends to self affiliated radio network controller, and this radio network controller sends to described radio network netgate with this user terminal wireless signal.
6. the method for claim 1, 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 receives self directly sends to above-mentioned radio network netgate;
And/or target cell base station directly sends to described radio network netgate via the above-mentioned user terminal wireless signal that the radio network controller under self receives self.
7. the method for claim 1 is characterized in that, among the step b, radio network netgate further carries out upper-layer protocol to the user terminal wireless signal of finishing merging and handles after finishing described grand diversity merging, sends to core net again.
8. as each described method of claim 1 to 7, it is characterized in that, among the step b, described user terminal 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 radio network gateway by source cell base station; If in the pilot measurement message that radio network netgate receives, when the district pilots signal that is comprised was lower than the threshold value of setting, this method further comprised:
Radio network netgate sends the activating set updating request to described user terminal, and this user terminal is received the activating set updating that carries out self after this request;
Radio network netgate also is lower than the cell base station transmission link release request of the threshold value of setting to the described district pilots signal that comprises; 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 is characterized in that, if after described cell base station is released to described user terminal assigned radio resource, this user terminal only keeps wireless connections with source cell base station, 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 |
|---|---|---|---|
| CNB2004101035748A CN100387097C (en) | 2004-12-30 | 2004-12-30 | Soft switching method |
| PCT/CN2005/002398 WO2006069545A1 (en) | 2004-12-30 | 2005-12-30 | Soft handoff method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004101035748A CN100387097C (en) | 2004-12-30 | 2004-12-30 | Soft switching method |
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| CN1798440A CN1798440A (en) | 2006-07-05 |
| CN100387097C true CN100387097C (en) | 2008-05-07 |
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| CNB2004101035748A Expired - Fee Related CN100387097C (en) | 2004-12-30 | 2004-12-30 | Soft switching method |
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| CN (1) | CN100387097C (en) |
| WO (1) | WO2006069545A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8743825B2 (en) * | 2006-08-17 | 2014-06-03 | Nokia Corporation | Handovers in a communication system |
| CN101562907B (en) * | 2008-04-14 | 2012-06-27 | 华为技术有限公司 | Method and device for managing base station and base station |
| CN102083153B (en) * | 2010-08-12 | 2014-09-10 | 电信科学技术研究院 | Method and device for replacement of main cell |
| JP5452459B2 (en) * | 2010-12-16 | 2014-03-26 | 株式会社Ｎｔｔドコモ | Home base station and handover method |
| WO2016095115A1 (en) * | 2014-12-17 | 2016-06-23 | Qualcomm Incorporated | Handover using dual active connections |
| CN113016211A (en) | 2018-11-27 | 2021-06-22 | Oppo广东移动通信有限公司 | Wireless communication method, terminal equipment and network equipment |
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| CN1284249A (en) * | 1997-11-26 | 2001-02-14 | 艾利森电话股份有限公司 | Multistage diversity handling for mobile telecommunications |
| CN1291384A (en) * | 1998-02-16 | 2001-04-11 | 诺基亚网络有限公司 | Method and system for controlling macrodiversity connection through at least two radio network controllers |
| CN1297664A (en) * | 1998-03-31 | 2001-05-30 | 诺基亚网络有限公司 | Method for controlling connections to mobile station |
| US20020061764A1 (en) * | 2000-11-18 | 2002-05-23 | Lg Electronics, Inc. | Method for controlling power of TFCI field for dsch in 3G standard mobile communication system |
| US20030161284A1 (en) * | 2002-02-22 | 2003-08-28 | Chen Xiaobao X | Universal mobile telecommunications system ("UMTS") network, a base station therefor, and a user terminal therefor |
| CN1540999A (en) * | 2003-04-24 | 2004-10-27 | 普天信息技术研究院 | Accessing method and system for wireless access system |
-
2004
- 2004-12-30 CN CNB2004101035748A patent/CN100387097C/en not_active Expired - Fee Related
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2005
- 2005-12-30 WO PCT/CN2005/002398 patent/WO2006069545A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1284249A (en) * | 1997-11-26 | 2001-02-14 | 艾利森电话股份有限公司 | Multistage diversity handling for mobile telecommunications |
| CN1291384A (en) * | 1998-02-16 | 2001-04-11 | 诺基亚网络有限公司 | Method and system for controlling macrodiversity connection through at least two radio network controllers |
| CN1297664A (en) * | 1998-03-31 | 2001-05-30 | 诺基亚网络有限公司 | Method for controlling connections to mobile station |
| US20020061764A1 (en) * | 2000-11-18 | 2002-05-23 | Lg Electronics, Inc. | Method for controlling power of TFCI field for dsch in 3G standard mobile communication system |
| US20030161284A1 (en) * | 2002-02-22 | 2003-08-28 | Chen Xiaobao X | Universal mobile telecommunications system ("UMTS") network, a base station therefor, and a user terminal therefor |
| CN1540999A (en) * | 2003-04-24 | 2004-10-27 | 普天信息技术研究院 | Accessing method and system for wireless access system |
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| CN1798440A (en) | 2006-07-05 |
| WO2006069545A1 (en) | 2006-07-06 |
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