CN101772095A - Call switching method , system and subsystem of objective base station - Google Patents
Call switching method , system and subsystem of objective base station Download PDFInfo
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- CN101772095A CN101772095A CN200810247431A CN200810247431A CN101772095A CN 101772095 A CN101772095 A CN 101772095A CN 200810247431 A CN200810247431 A CN 200810247431A CN 200810247431 A CN200810247431 A CN 200810247431A CN 101772095 A CN101772095 A CN 101772095A
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Abstract
The embodiment of the invention discloses a call switching method, a system and a subsystem of an objective base station. The call switching method comprises: activating a CoG communication channel of the objective base station to be switched according to the instruction of the ability of the mobile station CoG, and sending the switching instruction information containing the characteristic information of the CoG communication channel to the mobile station; according to the group switching access information of the group domain or the switching access information of the circuit domain sent by the mobile station, sending the messages which contains the grouped physical information of the group domain or the physical information of the circuit domain needed correct access of the CoG communication channel by the mobile station to the mobile station; and receiving the returned switching complete information after the successful switching of the mobile station to the CoG communication channel of the objective base station. The method and the device provided by the embodiment of the invention can avoid the occurrence of dropped call, thereby ensuring the normal operation of the user business in the CS domains such as call switching and the like.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of call handover method, system and subsystem of objective base station.
Background technology
At present, global mobile communication (Global System For Mobile Communication, abbreviation GSM) there are circuit domain (Circuit Switched domain is called for short CS) and two kinds of business of packet domain (Packet Switcheddomain is called for short PS) in system; Circuit domain adopts Dm channel uplink access protocol (LinkAccess Protocol on the Dm Channel is called for short LAPDm) agreement at layer 2, and monopolizes channel, and every time slot (timeslot is called for short TSL) carries two speech businesses at most; Packet domain adopts medium access control/Radio Link control (RLC/MAC) agreement at layer 2, allows the user multiplexing in a plurality of time slots, also allows a plurality of users of every timeslot multiplex.
In order to promote speech encoding rate, improve voice quality, introduced use GERAN network carrying CS speech business (CS over GERAN) technology, this technology is applicable to full-rate codes decoder (FR), half rate encoded decoder (HR), enhanced full rate speed encoding decoder (EFR) and adaptive multi-rate (Adaptive Multi-Rate is called for short AMR) speech business.By using CS over GERAN technology, realize the multiplexing and resource-sharing in CS territory and PS territory, promote spectrum efficiency, improve network capacity, with GSM EDGE wireless access network (GSM EDGE Radio Access Network, abbreviation GERAN) correlation technique is applied to speech business, can realize that the technology of circuit domain and packet domain is shared.
Owing to be carried on the PS packet network, so speech business can adopt higher speech encoding rate, even can introduce high-order modulating such as 16QAM and 32QAM; Set up the virtual connection of (Temporary Block Flow is called for short TBF) of similar Temporary Block Flow for speech business, can carry out the RLC encoding and decoding to speech frame, thereby realize between the CS, the multiplexing and resource-sharing between the CS/PS at L2; Speech frame is carried out the RLC coding, then eating dishes without rice or wine and to adopt the channel coding/decoding mode of PS.
The inventor finds that in realizing process of the present invention there is following defective at least in prior art: travelling carriage can't be known channel parameter when the COG channel in carrying out BSC switched, carry out COG channel between BSC when switching travelling carriage can't know that channel parameter and target BS C can't know the CoG ability indication of travelling carriage, promptly whether travelling carriage supports the ability of CoG handoff technique.Therefore can cause dropped calls, the COG channel switches and can't normally carry out.
Summary of the invention
The first aspect of the embodiment of the invention provides a kind of call handover method, uses the defective that CS user's calling switching flow can not normally carry out after the CS over GEREN technology to solve prior art.
The second aspect of the embodiment of the invention provides a kind of subsystem of objective base station, uses the defective that CS user's calling switching flow can not normally carry out after the CS over GEREN technology to solve prior art.
The third aspect of the embodiment of the invention provides a kind of calling switched system, uses the defective that CS user's calling switching flow can not normally carry out after the CS over GEREN technology to solve prior art.
First aspect according to the embodiment of the invention, a kind of call handover method that provides, comprise: according to the indication of travelling carriage CoG ability, behind the CoG channel of the target BS that activation will switch to, the switching command message that sends the characteristic information that includes described CoG channel is to travelling carriage; The grouping of the packet domain that sends according to travelling carriage is switched the switching that inserts message or circuit domain and is inserted message, sends the grouping physical information message that comprises the correct packet domain that inserts described CoG channel information needed of described travelling carriage or the physical information message of circuit domain to described travelling carriage; Receive the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS.
Second aspect according to the embodiment of the invention, a kind of subsystem of objective base station that provides, comprise: target base station controller, be used for indicating according to travelling carriage CoG ability, activate the CoG channel that will switch to by target BS, transmission includes the switching command message of characteristic information of described CoG channel to travelling carriage, receives the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS; Target BS, the grouping that is used for the packet domain that sends according to the travelling carriage that receives is switched the switching that inserts message or circuit domain and is inserted message, sends the grouping physical information message that comprises the correct packet domain that inserts described CoG channel information needed of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
The third aspect according to the embodiment of the invention, a kind of calling switched system that provides, comprise: mobile switching centre, be used for sending handoff request message, and in " classmark3 " cell of described handoff request message or newly-built cell, comprise the CoG ability indication of described travelling carriage to target base station controller; Target base station controller, be used for CoG ability indication according to the described travelling carriage that obtains from described mobile switching centre, activate the CoG channel that will switch to by target BS, the switching command message that sends the characteristic information include described CoG channel by handover request ack message is to travelling carriage, receives the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS; Target BS, the grouping that is used for the packet domain that sends according to the travelling carriage that receives is switched the switching that inserts message or circuit domain and is inserted message, send switching detection message to described mobile services switching centre by described target base station controller, send the grouping physical information message of the packet domain that comprises the described CoG channel information needed of the correct access of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
The call handover method that the embodiment of the invention provides, system and subsystem of objective base station, by in sending to the switching command message of target BS, comprising the characteristic information of the target COG channel that will switch to, and target base station controller obtains the CoG ability indication of travelling carriage from mobile switching centre, make CS territory user after using CS over GEREM technology, calling out switching flow can normally carry out, guarantee the quality of customer service, improved user's impression.
Description of drawings
Call handover method embodiment one flow chart that Fig. 1 provides for the embodiment of the invention;
Call handover method embodiment two flow charts that Fig. 2 provides for the embodiment of the invention;
Call handover method embodiment three flow charts that Fig. 3 provides for the embodiment of the invention;
The subsystem of objective base station structural representation that Fig. 4 a provides for the embodiment of the invention;
The structural representation of target base station controller in the subsystem of objective base station that Fig. 4 b provides for the embodiment of the invention;
The structural representation of target BS in the subsystem of objective base station that Fig. 4 c provides for the embodiment of the invention;
The structural representation of the calling switched system that Fig. 5 a provides for the embodiment of the invention;
The structural representation of target base station controller in the calling switched system that Fig. 5 b provides for the embodiment of the invention;
The structural representation of target BS in the calling switched system that Fig. 5 c provides for the embodiment of the invention.
Embodiment
For realizing packet network carrying CS speech business, the embodiment of the invention adopts the RLC/MAC agreement to replace original LAPDm agreement.Because CS over GEREN technology only can influence Um Interface, and to other interfaces such as A interface, Gb Interface without any influence, therefore speech business is carried on the packet network, need make amendment to the Um mouth protocol stack that relates to the CS territory.
As shown in Figure 1, be call handover method embodiment one flow chart that the embodiment of the invention provides, present embodiment comprises:
The grouping of step 102, the packet domain that sends according to travelling carriage is switched the switching that inserts message or circuit domain and is inserted message, sends the grouping physical information message that comprises the correct packet domain that inserts described CoG channel information needed of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
The call handover method that the embodiment of the invention provides, by in sending to the switching command message of target BS, comprising the characteristic information of the destination channel that will switch to, make the CS territory after using CS overGERAN technology, calling out switching flow can normally carry out, guarantee the quality of customer service, improved user's impression.
As shown in Figure 2, be call handover method embodiment two flow charts that the embodiment of the invention provides, present embodiment is with the example that switches between the BTS of MS in BSC, wherein source BTS is designated as BTS1, target BTS is designated as BTS2, and destination channel is the CoG channel, and concrete steps comprise:
Include MS in this switching command message and on new channel, insert and transmit all required characteristic informations, such as the coded system of channel or the cipher mode of channel etc.; Because the CoG channel is new channel type for the CS territory, therefore need in switching command message, carry all characteristic informations of CoG channel.
Need to describe the feature of destination channel in the switching command message, do not carry out the channel description and have corresponding cell for the CoG channel in the prior art; And the embodiment of the invention makes BTS1 can know the situation of destination channel by comprise the characteristic information of destination channel CoG channel in switching command message, thereby has avoided dropped calls, has guaranteed to call out normally carrying out of switching.
Present embodiment has used the grouping of packet domain switch to insert message, and switching that also can the transtation mission circuit territory inserts (Handover Access) message.
This step has been used the Packet PHY INFO of packet domain, physical message that also can the transtation mission circuit territory (Physical Information is called for short PHY INFO) message.
The call handover method that present embodiment provides, can make the CS territory after using CS over GEREN technology, BSC is according to the activation of carrying out destination channel between indication of the CoG ability of travelling carriage and the target BTS, and in switching command message, carry about the destination channel characteristic information, can guarantee normally to carry out the switching flow of the BTS in same BSC, avoid the phenomenon of dropped calls, guaranteed the quality of connection of conversation, improved user's business impression.Owing to adopted the RLC/MAC agreement to replace the LAPDm agreement, after MS receives the PHY INFO, needn't carry out the LAPDm link establishment process of layer 2 simultaneously, reduce unnecessary step, simplify call flow.
As shown in Figure 3, be call handover method embodiment three flow charts that the embodiment of the invention provides, present embodiment is with the example that switches to of the BTS of MS between BSC, wherein source BSC is designated as BSC1, and target BS C is designated as BSC2, and source BTS is designated as BTS1, target BTS is designated as BTS2, and concrete steps comprise:
After step 303, BSC1 receive measurement report message, according to the information of carrying in the measurement report message, judging needs this MS is switched to the affiliated sub-district of BSC2, and then BSC1 sends to switch and requires (Handover Required) message to MSC, and the request initiation is switched.
At this moment, include the CoG ability indication of the MS of MSC preservation in the handoff request message.Be specially: the classmark in the handoff request message is used to identify the information such as professional ability, band support, power and cryptographic capabilities of travelling carriage.Wherein, this classmark further comprises cells such as classmark1, classmark2 and classmark3, and also has idle bit in the classmark3 cell.Therefore can tell target BS C with the CoG ability indication of travelling carriage by the classmark3 cell in the handoff request message.Can also require the newly-built cell of the CoG ability of the description MS in the message in addition according to switching, in handoff request message, add this newly-built cell, and tell target BS C with the CoG ability indication of travelling carriage by this newly-built cell.
After step 309, MSC receive handover request ack message, send switching command message, promptly send A mouth switching command message to BSC1 to BSC1; BSC1 extracts the switching command of eating dishes without rice or wine (Handover Command) message that sends to terminal from above-mentioned switching command message, promptly from A mouth switching command message, extract the switching command message of eating dishes without rice or wine, and being sent to MS by BTS1, notice MS inserts at new channel; Include MS in the switching command message and on new channel, insert and transmit all required characteristic informations, such as the coded system of channel or the cipher mode of channel etc.Because the CoG channel is new channel type for the CS territory, therefore need in switching command message, carry all characteristic informations of CoG channel.
Use the grouping of packet domain to switch access message in the step of present embodiment, certainly, also can use the switching of circuit domain to insert message.
This step has been used the Packet PHY INFO of packet domain, PHY INFO that also can the transtation mission circuit territory.
After MSC receives the Handover Performed message of BSC2 transmission, send ClearCommand message to BSC1, BSC1 initiates local release, and the source of release channel returns ClearCMP simultaneously to MSC, and expression is removed and finished.
The call handover method that present embodiment provides, can make the CS territory after using CS over GEREN technology, target BS C can obtain the COG ability indication of travelling carriage from mobile switching centre, target BS C is according to the activation of carrying out destination channel between indication of the CoG ability of travelling carriage and the target BTS, and in switching command message, carry about the destination channel characteristic information, thereby can normally carry out the switching flow of the BTS between different B SC, avoided the phenomenon of dropped calls, guarantee the quality of connection of conversation, improved user's business impression.Owing to adopted the RLC/MAC agreement to replace the LAPDm agreement, after MS receives the PHY INFO, needn't carry out the LAPDm link establishment process of layer 2 simultaneously, reduce unnecessary step, simplify call flow.
Shown in Fig. 4 a, be the subsystem of objective base station structural representation that the embodiment of the invention provides, the subsystem of objective base station of present embodiment comprises:
Target base station controller 1, be used for indicating according to travelling carriage CoG ability, activate the CoG channel that will switch to by target BS, transmission includes the switching command message of characteristic information of described CoG channel to travelling carriage, receives the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS;
Target BS 2, the grouping that is used for the packet domain that sends according to the travelling carriage that receives is switched the switching that inserts message or circuit domain and is inserted message, sends the grouping physical information message that comprises the correct packet domain that inserts described CoG channel information needed of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
The subsystem of objective base station that the embodiment of the invention provides, can make the CS territory after using CS overGEREN technology, target BS C is according to the activation of carrying out destination channel between indication of the CoG ability of travelling carriage and the target BTS, and in switching command message, carry about the destination channel characteristic information, can guarantee normally to carry out the switching flow of the BTS in same BSC, avoid the phenomenon of dropped calls, guaranteed the quality of connection of conversation, improved user's business impression.Owing to adopted the RLC/MAC agreement to replace the LAPDm agreement, after MS receives the PHY INFO, needn't carry out the LAPDm link establishment process of layer 2 simultaneously, reduce unnecessary step, simplify call flow.
Shown in Fig. 4 b, the structural representation of target base station controller in the subsystem of objective base station that provides for the embodiment of the invention, target base station controller comprises in the subsystem of objective base station of present embodiment:
First active module 11 is used for activating the CoG channel that will switch to by target BS according to the indication of travelling carriage CoG ability;
Shown in Fig. 4 c, the structural representation of target BS in the subsystem of objective base station that provides for the embodiment of the invention, target BS comprises in the subsystem of objective base station of present embodiment:
Second receiver module 21, the switching access message that inserts message or circuit domain is switched in the grouping that is used for the packet domain of receiving mobile transmission;
First sending module 22, the described message that is used for receiving according to described second receiver module sends the grouping physical information message of the packet domain that comprises the described CoG channel information needed of the correct access of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
Shown in Fig. 5 a, the structural representation of the calling switched system that provides for the embodiment of the invention, the calling switched system of present embodiment comprises:
Mobile switching centre 3 is used for sending handoff request message to target base station controller, and comprises the CoG ability indication of described travelling carriage in " classmark3 " cell of described handoff request message or newly-built cell;
Target base station controller 4, be used for CoG ability indication according to the described travelling carriage that obtains from described mobile switching centre, activate the CoG channel that will switch to by target BS, the switching command message that sends the characteristic information include described CoG channel by handover request ack message is to travelling carriage, receives the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS;
Target BS 5, the grouping that is used for the packet domain that sends according to the travelling carriage that receives is switched the switching that inserts message or circuit domain and is inserted message, send switching detection message to described mobile services switching centre by described target base station controller, send the grouping physical information message of the packet domain that comprises the described CoG channel information needed of the correct access of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
The calling switched system that the embodiment of the invention provides, can make the CS territory after using CS overGEREN technology, target BS C can obtain the COG ability indication of travelling carriage from mobile switching centre, target BS C is according to the activation of carrying out destination channel between indication of the CoG ability of travelling carriage and the target BTS, and in switching command message, carry about the destination channel characteristic information, thereby can normally carry out the switching flow of the BTS between different B SC, avoided the phenomenon of dropped calls, guarantee the quality of connection of conversation, improved user's business impression.Owing to adopted the RLC/MAC agreement to replace the LAPDm agreement, after MS receives the PHY INFO, needn't carry out the LAPDm link establishment process of layer 2 simultaneously, reduce unnecessary step, simplify call flow.
Shown in Fig. 5 b, the structural representation of target base station controller in the calling switched system that provides for the embodiment of the invention, the target base station controller of present embodiment comprises:
Second active module 41 is used for the CoG ability indication according to the described travelling carriage that obtains from described mobile switching centre, activates the CoG channel that will switch to by target BS;
The 3rd receiver module 43 is used to receive the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS.
Shown in Fig. 5 c, the structural representation of target BS in the calling switched system that provides for the embodiment of the invention, the target BS of present embodiment comprises:
The 4th receiver module 51, the switching access message that inserts message or circuit domain is switched in the grouping that is used for the packet domain of receiving mobile transmission;
Second sending module 52, be used for message according to described the 4th receiver module reception, send switching detection message to described mobile services switching centre by described target base station controller, send the grouping physical information message of the packet domain that comprises the described CoG channel information needed of the correct access of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
For device or system embodiment, because it is substantially corresponding to method embodiment, so describe fairly simplely, relevant part gets final product referring to the part explanation of method embodiment.Device described above or system embodiment only are schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select wherein some or all of module to realize the purpose of present embodiment scheme according to the actual needs.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (9)
1. a call handover method is characterized in that, comprising:
According to the indication of travelling carriage CoG ability, behind the CoG channel of the target BS that activation will switch to, the switching command message that sends the characteristic information that includes described CoG channel is to travelling carriage;
The grouping of the packet domain that sends according to travelling carriage is switched the switching that inserts message or circuit domain and is inserted message, sends the grouping physical information message that comprises the correct packet domain that inserts described CoG channel information needed of described travelling carriage or the physical information message of circuit domain to described travelling carriage;
Receive the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS.
2. call handover method according to claim 1 is characterized in that, if described target BS belongs to different base station controllers with source base station,
Then described method also comprises: the grouping of the packet domain that sends according to travelling carriage is switched the switching that inserts message or circuit domain and is inserted message, sends switching detection message to mobile services switching centre by described target base station controller;
Also comprised before the CoG channel that activates the target BS that will switch to: the source base station controller sends to switch to mobile switching centre and requires message, make described mobile switching centre require message to send handoff request message, and in " classmark3 " cell of described handoff request message or newly-built cell, comprise the CoG ability indication of described travelling carriage to described target base station controller according to described switching.
3. call handover method according to claim 2 is characterized in that, switching command message to the travelling carriage that described transmission includes the characteristic information of described CoG channel specifically comprises:
The source base station controller is received the switching command message that mobile switching centre sends, and extracts the switching command of eating dishes without rice or wine wherein, and the switching command message that will include the characteristic information of described CoG channel by source base station is sent to described travelling carriage.
4. a subsystem of objective base station is characterized in that, comprising:
Target base station controller, be used for indicating according to travelling carriage CoG ability, activate the CoG channel that will switch to by target BS, transmission includes the switching command message of characteristic information of described CoG channel to travelling carriage, receives the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS;
Target BS, the grouping that is used for the packet domain that sends according to the travelling carriage that receives is switched the switching that inserts message or circuit domain and is inserted message, sends the grouping physical information message that comprises the correct packet domain that inserts described CoG channel information needed of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
5. subsystem of objective base station according to claim 4 is characterized in that, described target base station controller comprises:
First active module is used for activating the CoG channel that will switch to by target BS according to the indication of travelling carriage CoG ability;
First handover module is used for after described active module activates described CoG channel, and the switching command message that sends the characteristic information that includes described CoG channel is to travelling carriage;
First receiver module is used to receive the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS.
6. subsystem of objective base station according to claim 4 is characterized in that, described target BS comprises:
Second receiver module, the switching access message that inserts message or circuit domain is switched in the grouping that is used for the packet domain of receiving mobile transmission;
First sending module, the described message that is used for receiving according to described second receiver module sends the grouping physical information message of the packet domain that comprises the described CoG channel information needed of the correct access of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
7. call out switched system for one kind, it is characterized in that, comprising:
Mobile switching centre is used for sending handoff request message to target base station controller, and comprises the CoG ability indication of described travelling carriage in " classmark3 " cell of described handoff request message or newly-built cell;
Target base station controller, be used for CoG ability indication according to the described travelling carriage that obtains from described mobile switching centre, activate the CoG channel that will switch to by target BS, the switching command message that sends the characteristic information include described CoG channel by handover request ack message is to travelling carriage, receives the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS;
Target BS, the grouping that is used for the packet domain that sends according to the travelling carriage that receives is switched the switching that inserts message or circuit domain and is inserted message, send switching detection message to described mobile services switching centre by described target base station controller, send the grouping physical information message of the packet domain that comprises the described CoG channel information needed of the correct access of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
8. calling switched system according to claim 7 is characterized in that, described target base station controller comprises:
Second active module is used for the CoG ability indication according to the described travelling carriage that obtains from described mobile switching centre, activates the CoG channel that will switch to by target BS;
Second handover module is used for sending the switching command message of the characteristic information that includes described CoG channel to travelling carriage by handover request ack message;
The 3rd receiver module is used to receive the handoff completion message that described travelling carriage successful switch returns behind the CoG channel of described target BS.
9. calling switched system according to claim 7 is characterized in that, described target BS comprises:
The 4th receiver module, the switching access message that inserts message or circuit domain is switched in the grouping that is used for the packet domain of receiving mobile transmission;
Second sending module, be used for message according to described the 4th receiver module reception, send switching detection message to described mobile services switching centre by described target base station controller, send the grouping physical information message of the packet domain that comprises the described CoG channel information needed of the correct access of described travelling carriage or the physical information message of circuit domain to described travelling carriage.
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