CN1997196A

CN1997196A - Solution method for call loss and wireless network controller

Info

Publication number: CN1997196A
Application number: CNA2006101403151A
Authority: CN
Inventors: 徐宏伟; 刘霞玲; 徐晓琳; 高珑珑; 薛丽军
Original assignee: Huawei Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2006-11-27
Filing date: 2006-11-27
Publication date: 2007-07-11
Anticipated expiration: 2026-11-27
Also published as: CN100455097C

Abstract

This invention discloses one method and wireless network controller to solve drop method, which comprises the following steps: after receiving terminal drop message in wireless linkage for wireless network controller judging the above loss number is larger than terminal record wireless linkage number; if yes, keeping the wireless linkage; in data upper linkage, using linkage with good upper quality and down bad quality while the reverse in data down layer.

Description

Solve the method and the radio network controller of call drop

Technical field

The present invention relates to moving communicating field, relate in particular to the method and the radio network controller that solve call drop.

Background technology

The signal cover of sub-district is inhomogeneous or terminal (UE) mobile, the variation that the signal quality of the sub-district in the UE active set is not stopping, active set is the set that the UE sub-district of communicating by letter is formed, and monitors that collection is to enter the set that the sub-district of UE active set is formed.Because the soft handover Radio Link increases, concentrate UE may have multi wireless links (RL) in current active, UE can use multi wireless links RL to come to communicate with network, improves communication quality.

But when RL up-downgoing voice quality goes wrong, may cause conversation loss.Main scene is the situation that there is multi wireless links in UE.Please refer to Fig. 1, in soft handover, UE produces two RL, and wherein, the good downlink quality of RL1 uplink speech quality is bad, and the bad downlink quality of RL2 uplink speech quality is good.Base station (NODEB) is detected link is up, when detecting the up poor quality of Radio Link RL2, just report radio link failure indication RL FAILURE IND to give radio network controller (RNC), can carry the cause value of RL FAILURE in the message, fail such as uplink synchronous; This moment, RNC started a timer of waiting for wireless link recovery, if NODEB reports wireless link recovery indication RL RESTORE IND before timer expiry, then kept this link; If reporting, NODEB do not recover indication before timer expiry, behind the timer expiry, RNC sends Radio Link removal request RL DELETE REQEST to NODEB, NODEB is after having deleted all related resources of this RL2, to RNC feedback Radio Link deletion response RL DELETE RESPONSE.Because the RL2 uplink speech quality is bad, NODEB reports radio link failure information, and has finally deleted RL2, like this, and the only remaining RL1 of the Radio Link of UE.UE detects link is descending, when descending decay is lower than predetermined threshold, to the RNC reporting information.

From above prior art as can be seen, because there are many RL in the UE that makes of soft handover, reasons such as the cell signal covering is inhomogeneous cause the up poor quality of RL, owing to after the base station detects up poor quality's Radio Link, will report to radio network controller, under current mechanism, do not recover indication if receive before the timer expiry, radio network controller will send the request of deletion current wireless link, make that up poor quality's Radio Link is deleted, thereby cause conversation loss.

Summary of the invention

The technical problem to be solved in the present invention provides method and the radio network controller that solves call drop, to avoid conversation loss, improves network quality.

For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions:

A kind of method that solves call drop comprises: when upgrading Radio Link, and the connection Radio Link number of record terminal; After receiving the Radio Link uplink loss information of described terminal, write down the uplink loss Radio Link number of described terminal, judge that whether described uplink loss Radio Link number is less than described connection Radio Link number, if, the uplink loss Radio Link that keeps described terminal, otherwise, discharge resource.

A kind of radio network controller comprises Radio Link number record cell, step-out Radio Link number record cell, step-out link judging unit and step-out link processing unit; Radio Link number record cell is used for when upgrading Radio Link, the connection Radio Link number of record terminal; Step-out Radio Link number record cell after being used to receive the Radio Link uplink loss information of described terminal, writes down the uplink loss Radio Link number of described terminal; Step-out link judging unit, whether the uplink loss Radio Link number that is used to judge described terminal is less than the connection Radio Link number of described terminal, send judged result information step-out link processing unit to described step-out link processing unit, after receiving that described uplink loss Radio Link number is less than described connection Radio Link information of number, keep the uplink loss Radio Link of described terminal; After receiving that described uplink loss Radio Link number is equal to or greater than described connection Radio Link information of number, discharge resource.

Above technical scheme as can be seen, the present invention when upgrading Radio Link, the connection Radio Link number of record terminal; After receiving the Radio Link uplink loss information of described terminal, write down the uplink loss Radio Link number of described terminal, if described uplink loss Radio Link number is less than described connection Radio Link number, keep described uplink loss Radio Link, only when whole Radio Link uplink loss, just discharge resource; Continue communication owing to kept the uplink loss Radio Link, in data uplink, use the good and bad link of downlink quality of up quality, in data downstream, use good and up poor quality's the link of downlink quality, thereby avoid the terminal call drop, improve network quality.

Description of drawings

Fig. 1 is the terminal schematic diagram with two undesired Radio Links;

Fig. 2 is the method flow diagram of the embodiment of the invention;

Fig. 3 is for setting up the Radio Link signalling diagram;

Fig. 4 is a radio network controller schematic diagram of the present invention.

Embodiment

The invention provides the method and the radio network controller that solve call drop, its core concept is that radio network controller is after receiving the Radio Link uplink loss information of terminal, whether the Radio Link number of judging described uplink loss is less than the Radio Link number of described terminal record, if keep described Radio Link and continue communication; In data uplink, use the good and bad link of downlink quality of up quality, in data downstream, use good and up poor quality's the link of downlink quality, thereby avoid the terminal call drop, improve network quality.

Please refer to Fig. 2, be the method flow diagram of the embodiment of the invention.

Step 21. terminal is upgraded Radio Link.

In mobile communication system, because neighbor cell exists with situation frequently, UE can communicate by multi wireless links and network.When multi wireless links merges grand diversity,, reach the purpose of optimizing communication quality by selecting to merge or high specific merges.

The grand diversity of described merging is meant upstream data according to the function that certain algorithm merges, and reaches the purpose that improves transmission quality.Up merging process under the macro diversity situation is to go up the emphasis that line number passes, in order to improve the quality of transfer of data, be necessary the data of uploading by multilink are selectively merged, merging is that unit carries out with the data block, merging is a data block of preferentially selecting the Cyclic Redundancy Check indicating bit correct, under all correct or wrong situation of the CRC indicating bit of the data block of multilink, then select the data block of the maximum link of quality estimation (QE) wherein again.

Be example to increase Radio Link below, introduce the process of setting up of Radio Link.Please refer to Fig. 3, for setting up the Radio Link signalling diagram.

1.RNC be made in the judgement of setting up new Radio Link in the sub-district that NodeB provides and send Radio Link and set up request message Radio Link Setup Request to NodeB.

RNC can be divided into control RNC (Control RNC), Serving RNC (Serving RNC), Drift Radio Network Controller (Drift RNC) etc. according to the difference of effect.CRNC is the RNC that is responsible for control land radio access web (UTRAN) access point.All there is and only exists a control RNC in any UTRAN access point, and control RNC totally controls the logical resource of UTRAN access point; For UE, if with UTRAN between exist a RRC to be connected, and SRNC is managing the RRC connection of UE.The RNC of present embodiment is SRNC.

2.NodeB dispose its physical channel, and the signal that begins to receive UE sends Radio Link to RNC then and sets up response message Radio Link Setup Response to carry out uplink synchronous.

3.RNC set up with NodeB between Access Link Control Application Protocol (ALCAP) to carry new being connected.

4.RNC send down-going synchronous frame (DownlinkSynchronization) to NodeB by new ALCAP.

5.NodeB send uplink synchronous frame (Uplink Synchronization) to RNC by new ALCAP Data Iub Transport Bearer.NodeB begins downlink transfer.

6.RNC send RRC messaging activity collection updating message Active Set Update (Radio Link increase) to UE by DCCH.

7.UE finish message Active Set Update Complete response with the renewal of RRC messaging activity collection.

When UE when a sub-district moves to another sub-district, the increase or the deletion of Radio Link may take place.

Step 22. base station detects terminal wireless link uplink loss.Detection method can be the size according to the error rate.

For circuit commutative field (CS), the size of the error rate the when quality of link-quality is decided by encoding and decoding is for packet-switched domain (CS), the size of the error rate the when quality of link-quality is decided by Cyclic Redundancy Check.

Described CS territory is a circuit-switched service, comprises speech business, video telephone, and faxes etc. are for the higher real time business of delay requirement.Described PS territory is a packet switching service, comprises WEB, SMS service, multimedia service, non-real-time services such as stream business.

Step 23. base station reports the Radio Link of this terminal uplink loss.

When NodeB detects certain wireless links step-out,,, after NodeB detects step-out so, can report radio link failure indication RL FAILURE IND successively if the multi wireless links step-out is arranged just can report radio link failure to indicate to RNC.

Step 24. radio network controller judges whether whole Radio Link uplink loss of this terminal, if continue step 24b, otherwise continue step 24a.

Because RNC manages the Radio Link of (increasing and deletion) UE, thereby can obtain the bar number of the current wireless link establishment of UE.

Exist as UE under the situation of multi wireless links RL, if certain wireless links uplink loss, after RNC receives the radio link failure indication RL FAILURE IND of this RL, RNC does not handle RL FAILUREIND, notes the number of times of receiving radio link failure indication RL FAILURE IND; If receive the RL FAILURE IND of other RL, at this moment use the bar number of the radio link failure that total Radio Link RL number of UE and NODEB report to compare, so long as not the step-out indication RL FAILURE IND that has received all Radio Links, do not delete these Radio Links RL, continue to use these Radio Links to communicate.

Step 24a. keeps Radio Link and continues communication.NodeB and RNC hold consultation, and merge mechanism according to existing Radio Link, and these links are merged.Terminal can use these RL to transmit and receive data, according to the link preference policy, in data uplink, from the link that merges, select the good and bad link of downlink quality of up quality, in data downstream from the link that merges good and up poor quality's the link of selection downlink quality.

If all Radio Link RL of this terminal of step 24b. have reported radio link failure indication RLFAILURE IND, carry out unusual Radio Resource control and discharge.Delete the Radio Link of described terminal.

Please refer to Fig. 4, be radio network controller schematic diagram of the present invention.A kind of radio network controller 40 comprises Radio Link number record cell 41, step-out Radio Link number record cell 42, step-out link judging unit 43, step-out link processing unit 44 and link merge cells 45.

Radio Link number record cell 41 is used for when upgrading Radio Link, the connection Radio Link number of record terminal.

Step-out Radio Link number record cell 42 after being used to receive the Radio Link uplink loss information of described terminal, writes down the uplink loss Radio Link number of described terminal.

Step-out link judging unit 43, the uplink loss Radio Link number that is used to judge described terminal sends the judged result information whether less than the connection Radio Link number of described terminal to described step-out link processing unit 44.

Step-out link processing unit 44 after receiving that described uplink loss Radio Link number is less than described connection Radio Link information of number, keeps the uplink loss Radio Link of described terminal; After receiving that described uplink loss Radio Link number is equal to or greater than described connection Radio Link information of number, discharge resource.

Link merge cells 45 merges the Radio Link of described reservation, sends the information that described terminal can be used the Radio Link of described merging to the base station.Like this, described terminal just can use the Radio Link of reservation to communicate.

More than the method and the radio network controller of solution call drop provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims

1. a method that solves call drop is characterized in that, comprising:

When upgrading Radio Link, the connection Radio Link number of record terminal;

After receiving the Radio Link uplink loss information of described terminal, write down the uplink loss Radio Link number of described terminal, judge that whether described uplink loss Radio Link number is less than described connection Radio Link number, if, the uplink loss Radio Link that keeps described terminal, otherwise, discharge resource.

2. method according to claim 1 is characterized in that, described renewal comprises to be increased and/or deletion.

3. method according to claim 1 is characterized in that, before the reception uplink loss information, the base station detects the Radio Link uplink loss of described terminal, sends the Radio Link uplink loss information of described terminal to radio network controller.

4. method according to claim 3 is characterized in that, described detection detects for the size according to the error rate.

5. according to one of them described method of claim 1 to 4, it is characterized in that, behind the described reservation Radio Link, use the Radio Link of described reservation to communicate.

6. method according to claim 5, it is characterized in that, described use Radio Link communicates and is specially, and uses the measured Radio Link of up matter to communicate in data uplink, uses the good Radio Link of downlink quality to communicate in data downstream.

7. method according to claim 1 is characterized in that, after the described release resource, deletes whole Radio Links of described terminal.

8. a radio network controller is characterized in that, comprises Radio Link number record cell, step-out Radio Link number record cell, step-out link judging unit and step-out link processing unit;

Radio Link number record cell is used for when upgrading Radio Link, the connection Radio Link number of record terminal;

Step-out Radio Link number record cell after being used to receive the Radio Link uplink loss information of described terminal, writes down the uplink loss Radio Link number of described terminal;

Step-out link judging unit, the uplink loss Radio Link number that is used to judge described terminal sends judged result information whether less than the connection Radio Link number of described terminal to described step-out link processing unit;

Step-out link processing unit after receiving that described uplink loss Radio Link number is less than described connection Radio Link information of number, keeps the uplink loss Radio Link of described terminal; After receiving that described uplink loss Radio Link number is equal to or greater than described connection Radio Link information of number, discharge resource.

9. radio network controller according to claim 8 is characterized in that, also comprises the link merge cells;

The link merge cells merges the Radio Link of described reservation, sends the information that described terminal can be used the Radio Link of described merging to the base station.