CN102378292A - Method and device for performing handover among circuit switch (CS) service systems in dual-mode radio network controller (RNC) - Google Patents
Method and device for performing handover among circuit switch (CS) service systems in dual-mode radio network controller (RNC) Download PDFInfo
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- CN102378292A CN102378292A CN2010102528790A CN201010252879A CN102378292A CN 102378292 A CN102378292 A CN 102378292A CN 2010102528790 A CN2010102528790 A CN 2010102528790A CN 201010252879 A CN201010252879 A CN 201010252879A CN 102378292 A CN102378292 A CN 102378292A
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Abstract
The invention discloses a method and a device for performing handover among circuit switch (CS) service systems in a dual-mode radio network controller (RNC). The method is used for solving the problems of failure of handover among the systems which is caused by an undetermined time sequence of null synchronization information of user equipment (UE) and handover request information of repositioning among the systems during handover among the CS service systems in the dual-mode RNC. Under the condition that a basic station controller (BSC) receives handover access information which is sent by the UE first and then receives handover request information of a core network (CN), an objective radio access system BSC transmits the received data frames of a user to a source radio access system RNC, and the source radio access system transmits the data frames of the user to the core network. By the method and the device, the continuation from the data frames of the user to the core network is guaranteed, so the problems of failure of handover among the systems which is caused by the undetermined time sequence of null synchronization information of the UE and handover request information of repositioning among the systems in the prior art are solved, and the delay of handover among the systems and handover interruption delay are shortened.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of dual-mode wireless network controller (RadioNetwork Control, RNC) interior circuit switching (Circuit Switch, method of CS) switching between the operation system and device.
Background technology
In wireless communication networks, it is a kind of general network operation pattern that different radio access technologies is runed simultaneously.In the network that different radio access technologies is runed simultaneously, the network when realizing that different radio access technologies is runed simultaneously is complementary, and professional switching between different radio access technologies is a basic function.Switching flow is to prepare Radio Resource through reorientation message informing goal systems between system between at present conventional system, and goal systems is returned after the relocation response message just switching flow between the initiation system by the time, so handover delay is long; To the subscriber equipment of high-speed mobile (User Equipment, UE), the switching of long delay causes call drop easily, influence performance of handoffs and professional service quality (Quality of Service, Qos).
At present; The optimization flow process switched between the CS operation system based in the bimodulus RNC of Iur-g interface has been proposed in the company standard of some operator; Said Iur-g interface is the interface between RNC and the BSC, is used for the interoperability between 2G system and 3G system, like mutual information on load, handover information etc.It is as shown in Figure 1 that this optimizes the flow process concrete steps:
Step 101, RNC receive the measurement report of UE, in conjunction with the cell capacity and the information on load of GSM (Global System ofMobileCommunication, global system for mobile communications) adjacent area, confirm to switch in abutting connection with the sub-district of GSM to certain;
Step 102, RNC for this reason UE (Base Station Controller BSC) send to strengthen reorientation resource request (ENHANCED RELOCATION RESOURCE REQUEST), asks the reserved resource into this UE to base station controller;
After step 103, BSC receive the enhancing reorientation resource request of RNC transmission, be that UE distributes ad Hoc wireless network temporary mark (D-RNTI), and reserve Radio Resource; BSC sends to RNC and strengthens reorientation resource response (ENHANCED RELOCATION RESOURCE RESPONSE), simultaneously as optional mode, can carry the capacity and the information on load of 2G cell in the response message;
After step 104, RNC received the enhancing reorientation resource response message of BSC transmission, the switching command (Handover From UTRAN Command) of initiating related resource through idle message UTRAN (UMTS Terrestrial radio access network) network sent to UE.
When step 105, RNC send the switching command of said UTRAN network initiation; To core net (Central Network; CN) send reorientation and require (Relocation Required) message; Old base station sub-system in this message is added ad Hoc wireless network temporary identifier (Dedicated Radio Network TemporaryIdentifier, D-RNTI) information in new base station sub-system information (Old BSS to New BSS Information) cell;
After step 106, CN receive reorientation requirement message, send handoff request (HandoverRequest) message to BSC.
Step 107, BSC accomplish the foundation of A mouth resource; And related with the idle wireless resource of reservation according to the old base station sub-system of carrying in the handoff request message to the D-RNTI information in the new base station sub-system information cell, send Handover Request Acknowledge (Handover Request Acknowledge) message to CN; Said A interface is the interface between gsm wireless Access Network and the UE, is used to set up the Radio Link of eating dishes without rice or wine
After step 108, CN receive the switching request acknowledgement message of BSC, send reorientation order (Relocation Command) message to RNC;
After step 109, UE receive Handover From UTRAN Command message and detect the second generation (2G) Network Synchronization information, send switching to BSC and insert (Handover Access) message;
Because that RNC is connected with BSC possibly not be a CN; When confiscating handoff request message; BSC does not know which CN is data send to; Therefore, BSC is receiving the uplink user data that just can begin to receive the user after switching inserts message, and these data are sent to CN (because BSC this moment has received the handoff request message of CN).
Step 110, BSC send change detection (Handover Detect) message to CN after receiving that the switching of UE transmission inserts message;
Step 111, UE receive Handover From UTRAN Command message, after completion inserts the switching between standard, send switching to BSC and accomplish (Handover Complete) message;
After step 112, BSC receive the handoff completion message of UE, send switching to CN and accomplish (Handover Complete) message;
After step 113, CN receive message, send Iu mouth release command (Iu ReleaseCommand) to RNC, said Iu interface is the interface between RNC and the CN.
Above-mentioned optimization flow process advances to goal systems allocation of radio resources flow process between system before the reorientation flow process, eats dishes without rice or wine that the reorientation flow process is parallel between switching flow and system carries out, thereby has improved handover success rate between system, has reduced handover delay between system.But this optimizes the problem that flow process exists: the reorientation flow process is parallel between switching flow and system owing to eating dishes without rice or wine carries out, and the time delay of eating dishes without rice or wine is relevant with wireless quality; Reorientation time delay relevant with the network architecture (such as bimodulus standard shared core net etc. whether) between system; So the Target Wireless system possibly receive the air interface synchronization message (Handover Access) of UE earlier, also possibly receive the handoff request message (Handover Request) of reorientation between system earlier.The default objects wireless access system is received the handoff request message (Handover Request) of reorientation between system earlier at present; If receive air interface synchronization message (the Handover Access of UE earlier; Switch and insert message); The Target Wireless connecting system can't normal process, causes handoff failure between system.
Summary of the invention
The present invention is directed to the problem that exists based on handover optimization flow process between the system of Iur-g interface and the characteristics of bimodulus RNC and proposed professional inter-system switching method and the device of CS in a kind of bimodulus RNC, be used for solving handoff procedure between the interior CS operation system of bimodulus RNC because of handoff failure problem between the uncertain system that causes of sequential of the handoff request message (Handover Request) of reorientation between the air interface synchronization message (Handover Access) of UE and system.
For achieving the above object, technical scheme of the present invention is achieved in that
The method of switching between the CS operation system in a kind of bimodulus RNC, this method comprises:
In handoff procedure; If the BSC in the Target Wireless connecting system is before receiving handoff request (Handover Request) message that CN sends; Receive that earlier the switching that UE sends inserts (Handover Access) message; Then said BSC is transparent to the RNC in the wireless access system of source the user data frame that receives is become the coded system of source wireless access system through encoding and decoding conversion after, and said RNC is transmitted to CN with said user data frame again; Receive the handoff request message of said CN at said BSC after, said BSC directly is transmitted to CN with user data frame.
Receive at said BSC before the switching access message of UE transmission; Said BSC is that said UE distributes ad Hoc wireless network temporary mark (D-RNTI) and reserves Radio Resource, and said D-RNTI and reserved radio resource information are sent to said RNC through strengthening the reorientation resource response message;
Said RNC sends to said UE with reserved radio resource information, and sends re-positioning request (Relocation Required) message of carrying said D-RNTI information to CN simultaneously.
After said CN receives said RELOCATION REQUEST message, send said handoff request message to said BSC; Said BSC is in the foundation of accomplishing A mouth resource, and according to said D-RNTI with after the idle wireless resource of reservation is related, to CN transmission switching request acknowledgement message;
After said CN receives the switching request acknowledgement message of BSC transmission, send the reorientation command messages to RNC; Receive the handoff completion message of said UE transmission at said BSC after, send handoff completion message to CN.
Switch between the CS operation system in the said bimodulus RNC based on the inner self defined interface of bimodulus RNC and realize.
Based on said method, the present invention also proposes device for switching between the interior CS operation system of a kind of bimodulus RNC, comprises RNC, BSC, CN,
Said BSC is used for receiving the handoff request message of CN transmission and the switching access message of UE transmission at handoff procedure; If before the handoff request message that receives said CN transmission; Receive that earlier the switching that UE sends inserts message, then said BSC also is used for the user data frame that receives is become the RNC that passes through said source wireless access system after the coded system of source wireless access system through encoding and decoding conversion;
Said RNC also is used for when receiving the said user data frame of said BSC transparent transmission, said user data frame being transmitted to CN;
After said BSC received the handoff request message of said CN transmission, said BSC also was used for the user data frame that receives directly is transmitted to said CN.
The present invention BSC receive earlier switching that UE sends insert message (being used for air interface synchronization), after receive under the situation of handoff request message (being used for reorientation between system) of CN; Target Wireless connecting system BSC is transparent to source wireless access system RNC the user data frame of receiving is become the coded system of source wireless access system through encoding and decoding conversion after, and the source wireless access system is delivered to core net with user data frame again.Guaranteed user data frame continuing through the present invention to core net; Thereby solved in the prior art problem, handover delay and handoff time delay between the shortening system because of handoff failure between the uncertain system that causes of sequential of the handoff request message of reorientation between the air interface synchronization message of UE and system.
Description of drawings
Fig. 1 is the professional inter-system switching method flow chart of the interior CS of bimodulus RNC in the prior art;
The professional inter-system switching method flow chart of the interior CS of bimodulus RNC that Fig. 2 proposes for the present invention;
Fig. 3 is for realizing the schematic network structure of CS operation system method for switching between in the bimodulus RNC of the present invention.
Embodiment
In bimodulus RNC; Because 3G (third generation communication system; Like UMTS) radio network controller (RNC) and 2G (second generation communication system is like GSM) base station controller BSC unite two into one, between system in the handoff procedure CS business also can adopt thought based on handover optimization flow process between the system of Iur-g interface; Therefore, the characteristics that the present invention is directed to the problem that exists based on handover optimization flow process between the system of Iur-g interface and bimodulus RNC have proposed the inter-system switching method and the device of CS business in a kind of bimodulus RNC.Basic thought of the present invention is: between system in the handover optimization flow process; When the reorientation flow process of eating dishes without rice or wine between switching flow and system is parallel when carrying out; If the Target Wireless connecting system has received before that in the handoff request message (HandoverRequest) of receiving reorientation between system the switching that is used for air interface synchronization that UE sends inserts (Handover Access) message; Then Target Wireless connecting system (BSC) is transparent to source wireless access system (RNC) after receiving user data frame, and the business data flow that user data frame forms is delivered to core net (CN) by source wireless access system (RNC).The present invention has improved handover optimization flow process between the system of existing bimodulus RNC; Receive earlier that at BSC the switching that UE sends inserts under the situation of message; Still can guarantee that user data frame arrives the transmission of core net; Thereby solved in the prior art problem, handover delay and handoff time delay between the shortening system because of handoff failure between the uncertain system that causes of sequential of the handoff request message (being handoff request message) of reorientation between the air interface synchronization message (promptly switch and insert message) of UE and system.
For making the object of the invention, technical scheme and advantage clearer, below lift embodiment and with reference to accompanying drawing, to further explain of the present invention.
Fig. 2 is that the bimodulus RNC internal object wireless access system of the embodiment of the invention receives that earlier air interface synchronization message (HandoverAccess) receives the Data Stream Processing sketch map of the handoff request message of reorientation between system (Handover Request) again:
After step 201, RNC receive the measurement report of UE,, confirm that said UE switches in abutting connection with the sub-district of GSM to certain in conjunction with the cell capacity and the information on load of GSM adjacent area;
Step 202, RNC UE for this reason send enhancing reorientation resource request (ENHANCEDRELOCATION RESOURCE REQUEST) to BSC, and request BSC is this UE reserved resource;
After step 203, BSC receive the enhancing reorientation resource request message of RNC transmission, be that this UE distributes D-RNTI, and be that this UE reserves Radio Resource; Then, BSC sends to RNC and strengthens reorientation resource response (ENHANCED RELOCATION RESOURCE RESPONSE), and carries the D-RNTI that BSC is the UE distribution in this message.As optional mode, can carry the capacity and the information on load of 2G cell in the response message simultaneously;
After step 204, RNC received and strengthen the reorientation resource response message, the switching command (Handover From UTRAN Command) of initiating relevant Radio Resource through idle message UTRAN network sent to said UE;
When step 205, RNC send the switching command of UTRAN network initiation; Send re-positioning request (Relocation Required) message to CN, in new base station sub-system information (Old BSS to New BSS Information) cell, add D-RNTI information in the old base station sub-system of this message;
Step 206, UE send switching to BSC and insert (HandoverAccess) message after receiving the switching command message that the UTRAN network is initiated and detecting the 2G synchronizing information;
BSC begins to receive user's uplink user data after receiving the switching access message that UE sends; Because this moment, BSC did not also receive handoff request (Handover Request) message of CN; BSC does not also know the CN office direction, so BSC user data that the UE that receives is sent converts the 3G coding mode to and pass through RNC, is transmitted to CN by RNC again; Through above-mentioned processing; Guaranteed after BSC receives the switching incoming order that UE sends earlier, to receive under the situation of the handoff request message that CN sends, the continuing of user data, thus avoided the failure of switching between system.
Step 207, CN receive after reorientation that RNC sends requires message, send handoff request (Handover Request) message to BSC.
BSC is after receiving the handoff request message that CN sends; Continue to receive uplink user data frame (DATAFRAME); Because the handoff request message that this moment, BSC sent through CN has been known the office direction that UE switches, therefore, BSC can directly send to CN with the user data frame that receives.
Step 208, BSC accomplish the foundation of A mouth resource; And related with the idle wireless resource of reservation according to old base station sub-system to the D-RNTI information in new base station sub-system information (the Old BSS to New BSS Information) cell, send Handover Request Acknowledge (Handover Request Acknowledge) message to CN;
After step 209, CN receive the switching request acknowledgement message of BSC transmission; Send reorientation order (Relocation Command) message to RNC; This message is used to notify RNC, and (if the CN of 3G/2G separates, being reoriented on the CN of 2G) accomplished in the CN reorientation this moment;
Step 210, BSC send change detection (Handover Detect) message to CN after receiving that the switching of UE transmission inserts (Handover Access) message;
Step 211, UE receive the Handover From UTRAN Command message that RNC sends, and after completion inserts the switching between standard, send switching to BSC and accomplish (Handover Complete) message;
After step 212, BSC receive the handoff completion message of UE, send handoff completion message to CN;
After step 213, CN receive the handoff completion message of BSC transmission, send Iu mouth release command (Iu Release Command) message to RNC.
Fig. 3 is for realizing the schematic network structure of CS operation system method for switching between in the bimodulus RNC of the present invention; Switching device shifter mainly comprises dual-mode wireless network controller (Dual-Mode Radio Network Controller between the interior CS operation system of the bimodulus RNC that the present invention proposes; Bimodulus RNC) RNC in, BSC, CN; This device and the difference that has now based on the optimization flow process of switching between the CS operation system in the bimodulus RNC of Iur-g interface are; Switch between the CS operation system in the bimodulus RNC according to the invention based on the inner self defined interface of bimodulus RNC and realize; In handoff procedure, receiving as BSC before handoff request (HandoverRequest) message of CN transmission, when receiving switching access (Handover Access) message of UE transmission earlier; BS C also is used to receive the user data frame that UE sends, and said user data frame is transparent to RNC; RNC also is used for when receiving the said user data frame of said BSC transparent transmission, said user data frame being transmitted to CN; After BSC received the handoff request message of CN transmission, BSC also was used for the user data frame that receives directly is transmitted to said CN.
Can transparent data between two kinds of wireless access standards (RNC and BSC) of bimodulus RNC of the present invention, the user face data when switching between the completion system is mutual, thereby shortens handover delay and handoff time delay.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (8)
1. the method for switching between the interior circuit switching of a dual-mode wireless network controller (RNC) (CS) operation system is characterized in that,
In handoff procedure; If the base station controller (BSC) in the Target Wireless connecting system is before receiving handoff request (Handover Request) message that core net (CN) is sent; Receive that earlier the switching that subscriber equipment (UE) sends inserts (Handover Access) message; Then said BSC is transparent to the RNC in the wireless access system of source the user data frame that receives is become the coded system of source wireless access system through encoding and decoding conversion after, and said RNC is transmitted to CN with said user data frame again; Receive the handoff request message of said CN at said BSC after, said BSC directly is transmitted to CN with user data frame.
2. method according to claim 1 is characterized in that, receives at said BSC before the switching access message of UE transmission, also comprises:
Said BSC is that said UE distributes ad Hoc wireless network temporary mark (D-RNTI) and reserves Radio Resource, and said D-RNTI and reserved radio resource information are sent to said RNC through strengthening the reorientation resource response message;
Said RNC sends to said UE with reserved radio resource information, and sends re-positioning request (Relocation Required) message of carrying said D-RNTI information to CN simultaneously.
3. method according to claim 2 is characterized in that, said method also comprises:
After said CN receives said RELOCATION REQUEST message, send said handoff request message to said BSC; Said BSC is in the foundation of accomplishing A mouth resource, and according to said D-RNTI with after the idle wireless resource of reservation is related, to CN transmission switching request acknowledgement message;
After said CN receives the switching request acknowledgement message of BSC transmission, send the reorientation command messages to RNC; Receive the handoff completion message of said UE transmission at said BSC after, send handoff completion message to CN.
4. method according to claim 1 is characterized in that, switches between the CS operation system in the said bimodulus RNC based on the inner self defined interface of bimodulus RNC to realize.
5. device for switching between the CS operation system in the bimodulus RNC comprises RNC, BSC, CN, it is characterized in that,
BSC is used for receiving the handoff request message of CN transmission and the switching access message of UE transmission at handoff procedure; If before the handoff request message that receives said CN transmission; Receive that earlier the switching that UE sends inserts message, then said BSC also is used for the user data frame that receives is become the RNC that passes through said source wireless access system after the coded system of source wireless access system through encoding and decoding conversion;
RNC also is used for when receiving the said user data frame of said BSC transparent transmission, said user data frame being transmitted to CN;
After said BSC received the handoff request message of said CN transmission, said BSC also was used for the user data frame that receives directly is transmitted to said CN.
6. device according to claim 5 is characterized in that, receives at said BSC before the switching access message of said UE transmission,
Said BSC also is used to said UE and distributes D-RNTI and reserved resource, and said D-RNTI and reserved resource information are sent to said RNC through strengthening the reorientation resource response message;
Said RNC also is used for reserved resource information is sent to said UE, and sends the RELOCATION REQUEST message of carrying said D-RNTI information to said CN simultaneously.
7. device according to claim 6 is characterized in that,
Said CN also is used for after receiving said RELOCATION REQUEST message, sends said handoff request message to said BSC;
Said BSC also is used to accomplish the foundation of A mouth resource, and is related with the idle wireless resource of reservation according to said D-RNTI, sends switching request acknowledgement message to CN;
Said CN also is used to receive the switching request acknowledgement message that said BSC sends, and sends the reorientation command messages to said RNC;
Said BSC also is used to receive the handoff completion message that said UE sends, and sends handoff completion message to said CN.
8. device according to claim 5 is characterized in that, switches between the CS operation system in the said bimodulus RNC based on the inner self defined interface of bimodulus RNC to realize.
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