CN101409907B

CN101409907B - Method and equipment for improving migration success rate

Info

Publication number: CN101409907B
Application number: CN2007101756035A
Authority: CN
Inventors: 陈力; 沈伟峰; 刘霞铃; 楚志远
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-10-08
Filing date: 2007-10-08
Publication date: 2010-11-10
Anticipated expiration: 2027-10-08
Also published as: CN101409907A

Abstract

The invention discloses a method for improving migration success ratio and a device thereof. The method mainly comprises the following steps: firstly a first device reconstructs a radio bearer with a second device, and then sends reconstruction indication information to the second device to inform the second device of the information that the first device reconstructs the radio bearer; and then after reconstructing the radio bearer with the first device and before receiving the reconstruction indication information, the second device does not receive and process the data transmitted from the first device, and receives and processes the data transmitted from the first device only after receiving the reconstruction indication information. The realization of the embodiment of the invention can inform the second device as an information receiver whether the first device as an information sender carries out a reconstruction operation, thus correctly processing the received information transmitted from the sender and further effectively improving the success ratio of the static migration.

Description

Method and equipment for improving migration success rate

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an implementation scheme for improving a migration success rate in a communication system.

Background

UMTS (universal mobile Telecommunications System), which is a third-generation mobile communication System, is also generally called a WCDMA communication System because it employs a WCDMA (Wideband Code Division Multiple Access) air interface technology.

The WCDMA communication system includes RAN (Radio Access Network) and CN (Core Network). The RAN implements all radio related functions, which are also commonly referred to as UTRAN (Universal terrestrial radio Access Network), and includes an RNC (radio Network controller).

In a WCDMA communication system, after a UE (User Equipment) accesses a network, if an IUR (logical interface between RNCs) interface exists between adjacent RNCs when a cross-RNC movement occurs, an SRNC (Serving radio network Controller) of the UE may be changed through static migration (UE not involved in the migration of the UE).

Accordingly, the processing procedure for the occurrence of UE not affected SRNS Relocation includes:

(1) the source RNC sends a COMMIT message to a target RNC (namely TRNC) through an IUR interface so as to inform the TRNC of the event that the UE is statically migrated;

(2) after receiving the COMMIT message, the TRNC establishes an SRB (including SRB1, SRB2, etc.) corresponding to the UE, and sends a UTRAN mobility information message to the UE from the corresponding SRB 1;

(3) after receiving the UTRAN MOBILITY INFORMATION message, the UE reconstructs the SRB2 and sends a UTRAN MOBILITY INFORMATION confirm message to the TRNC on the SRB 2.

In the above processing procedure, the SRB2 generally uses AM RLC (Acknowledged mode radio Link Control) to transfer information. In AM RLC processing, a sender needs to allocate a corresponding SN (Sequence Number) to each PDU (protocol data unit) sent by the sender as the Number of each PDU, and a receiver uses a status report to notify the sender of the Number of a PDU correctly received by the sender and the Number of an PDU not received by the sender, and then the sender retransmits the PDU not received. If the non-received SN range indicated in the status report received by the sender or the ACK message indicates that the successfully received LSN (last sequence Number) is outside the VT (A) SN < VT (S) range, the RLC will initiate a reset procedure, and if the SRB2 occurs a reset procedure, the talk procedure will be interrupted, where VT (A) is the lower edge of the transmission window and VT (S) is the SN of the next transmitted PDU.

As can be seen, when UE not affected SRNS Relocation occurs, SRB2 of TRNC is re-created, and the ascending VT (A) and VT (S) are both 0; and after receiving the UTRANMobilty Information message, the UE recreates the SRB2 and sets the uplink VT (A) and VT (S) to 0.

In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:

if the UE sends uplink data (e.g. measurement report) through the SRB2 before receiving the UTRAN mobility Information message, its uplink vt (a) and vt(s) may not be 0, which may cause the windows of the UE and TRNC to be inconsistent, and further cause the SRB2 to be reset, resulting in a failure of the migration.

Even if the windows of the corresponding UE and the TRNC are not consistent, the SRB2 may not be reset, and a signaling reassembly failure or loss may be caused, for example, the UE may have PDUA, B, and C transmissions with SN ═ 0(a), SN ═ 1(B), and SN ═ 2(C) before receiving the UTRAN Mobility Information message, and when the PDUA and B are transmitted, the UE receives the UTRAN Mobility Information message, reconstructs the SRB2, and retransmits PDUD, E, and F with SN ═ 0(D), SN ═ 1(E), and SN ═ 2(F), at which time, the TRNC may reassemble the PDUA, B, and F into one SDU, and correct processing may reassemble the PDUD, E, and F into one SDU, thus causing a migration failure.

Disclosure of Invention

The embodiment of the invention provides a method and equipment for improving the migration success rate, so that an information receiver can acquire information reconstructed by an information sender in the migration process, and the reliable implementation of the migration process is ensured.

The embodiment of the invention provides a method for improving migration success rate, which comprises the following steps:

after reconstructing the radio bearer between the first device and the second device, the first device sends reconstruction indication information for indicating that an operation of reconstructing the radio bearer is performed to the second device, and the second device is notified of information for reconstructing the radio bearer by the first device through the reconstruction indication information, so that after receiving the reconstruction indication information, the second device receives and processes the received data sent by the first device.

after the second device reconstructs the radio bearer with the first device, the second device does not receive the data sent by the first device until the second device receives reconstruction indication information sent by the first device, wherein the reconstruction indication information is used for indicating that the first device executes the operation of reconstructing the radio bearer;

and after receiving the reconstruction indication information, the second equipment receives and processes the received data sent by the first equipment.

An embodiment of the present invention provides a communication device, including:

a first radio bearer reestablishing unit, configured to reestablish a radio bearer with the second device;

a reestablishment notifying unit, configured to send reestablishment indication information indicating that an operation of reestablishing a radio bearer is performed to a second device, and notify the second device of information of reestablishing the radio bearer through the reestablishment indication information, so that after receiving the reestablishment indication information, the second device performs reception processing on the received data sent by the first device.

a second radio bearer reestablishing unit, configured to reestablish a radio bearer with the first device;

a reestablishment indication receiving unit, configured to receive reestablishment indication information sent by the first device, where the reestablishment indication information is used to indicate that the first device performs an operation of reestablishing a radio bearer;

a data receiving and processing unit, configured to not perform receiving processing on data sent by the first device after the second rb reestablishment unit reestablishes the rb until the reestablishment indication receiving unit receives the reestablishment indication information; after receiving the reconstruction instruction information sent by the first device, the receiving processing of the received data sent by the first device is started.

It can be seen from the technical solutions provided by the embodiments of the present invention that, by using the solutions provided by the embodiments of the present invention, the second device serving as the information receiver can know whether the first device serving as the information sender performs the rebuilding operation, so that the received information sent by the sender can be correctly processed, and the success rate of the static migration is effectively improved.

Drawings

FIG. 1 is a schematic diagram of a process provided by an embodiment of the present invention;

FIG. 2 is a diagram illustrating an original AM RLC header format according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating an expanded AM RLC header format according to an embodiment of the present invention;

fig. 4 is a first schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present invention.

Detailed Description

The implementation scheme for improving the migration success rate provided by the embodiment of the invention specifically comprises the following steps: firstly, after reconstructing a radio bearer between a first device and a second device, the first device sends reconstruction indication information to the second device, and the second device is notified of information of the first device reconstructing the radio bearer through the reconstruction indication information, that is, the reconstruction indication information is used for indicating that the first device performs an operation of reconstructing the radio bearer; after the second device reconstructs the radio bearer with the first device, the second device does not receive the data sent by the first device until the reconstruction indication information sent by the first device is received, and the second device receives the received data sent by the first device only after the reconstruction indication information is received. Therefore, migration failure caused by reasons such as data error receiving is avoided.

In the embodiment of the present invention, in the process of sending the reconstruction indicating information to the second device, any one of the following implementation manners may be specifically adopted:

(1) the reconstruction indication information is carried through an extension byte in the information sent by the first device to the second device, for example, a corresponding byte is added in the message to carry the reconstruction indication information;

(2) the reconstruction indication information is carried by a free bit or a free bit value in the information sent by the first device to the second device, for example, the reconstruction indication information is carried by an unoccupied bit or an unoccupied bit value in the message.

The embodiment of the invention can be applied to a WCDMA communication system to solve the problems existing in the prior art, such as avoiding wrong reconstructed SRB or wrong recombined SDU, and the like. If the WCDMA communication system is applied, the first device may be a user equipment, and the second device may be a radio network controller.

Taking the application of the embodiment of the present invention in a WCDMA communication system as an example, the corresponding processing procedure of sending the reconstruction indication information to the second device may include: after the user equipment serving as the first equipment receives the reconstruction message and completes the reconstruction operation, the reconstruction indication information is carried in a radio link control head of a confirmation mode and is sent to a target radio network controller serving as the second equipment. Correspondingly, the radio network controller serving as the second device receives the received protocol data unit containing the reconstruction indication information, and starts to receive the protocol data unit which is sent by the user equipment serving as the first device and does not carry the reconstruction indication information after obtaining a service data unit; further, the radio network controller may also obtain a service data unit containing the reestablishment indication information, and after a predetermined time elapses, stop performing data reception processing on the received protocol data unit carrying the reestablishment indication information and sent from the user equipment.

Still taking the application of the embodiment of the present invention in the WCDMA communication system as an example, in order to enable the TRNC to know whether the uplink data of the SRB2 sent by the UE is before or after receiving the reestablishment (such as UTRAN mobility information) message, so as to adopt a correct data processing manner, a specifically adopted implementation scheme may include:

the format of the AM RLC header is expanded, so that the RNC can distinguish whether the received uplink data is sent by the UE before or after the UE receives the reestablishment message in the static migration process; therefore, in the static migration process, when the TRNC starts to receive the data of the uplink SRB2, all the PDUs in the common RLC mode are discarded firstly, the received data are normally processed until the PDU in the extended mode is received, and the receiving process of the PDU in the common mode is recovered after the first SDU sent by the SRB2 is successfully recombined; the problems in the prior art can be effectively solved through the implementation scheme.

As shown in fig. 1, the corresponding processing procedure may specifically include the following steps:

step 1, UE receives a reconstruction message;

step 2, UE sends protocol data unit carrying reconstruction indication information to target RNC;

specifically, an extension field may be added to the RLC header so that the UE may use the field to inform the RNC whether the RNC receives the re-establishment; or, extension for other fields may also be adopted to carry corresponding reconstruction indication information;

taking the example of adding an extension field in the AM RLC header to carry the reconstruction indication information, two bytes of the original AM RLC header may be specifically extended into three bytes;

the original AM RLC Header format is shown in fig. 2, where D/C is 1bit, SN is 12bit, P is 1bit, HE (Header Extension Type) is 2bit, and HE has a value 11 not used, in order to avoid exhausting the last Extension bit of RLC, it may be set when HE equals 11, the AM RLC Header format is changed from two bytes to three bytes, which is shown in fig. 3 after changing to three bytes, that is, when HE equals 11, the AM Header format extends one byte (three bytes in total), where the highest S of the third byte is 1 to indicate that UE has just received a re-establishment message, and other 7 bits may be reserved bytes for future Extension;

thus, under normal conditions, the AM RLC header in the message sent by the UE through the SRB2 adopts a normal mode (i.e., HE 00/01/10), so that the corresponding header overhead is not increased; if the UE receives the reestablishment message, and the message causes the SRB2 to reestablish, the UE starts to use the HE-11 extension mode for the AM RLC header in the message sent through the SRB2 to transmit data, and sets the highest-order S value of the third byte of the AM RLC header extension to 1, and determines that the AM RLC header can resume using the normal mode in the sent message after the RNC successfully receives a reestablishment confirmation (e.g., an ultra Mobility Information Confirm) message.

Of course, in the embodiment of the present invention, other bits except the highest bit in the third byte may be used to carry the reconstruction indication information, or a certain bit in the original two bytes may be used to carry the reconstruction indication information, and the information that the corresponding bit needs to carry is carried in the extended third byte;

in the embodiment of the present invention, it is also possible to still keep the AM RLC header as two bytes, and use a certain bit in the original two bytes to carry the reestablishment indication information, for example, when a certain bit is highlighted in the original AM RLC header and can be used, the bit can be used to carry the reestablishment indication information;

step 3, after receiving the protocol data unit which is sent by the UE and bears the reconstruction indicating information, the target RNC receives the data according to the reconstruction indicating information;

the processing specifically employed at the target RNC, TNRC, may include: when the TRNC in the static migration starts to receive the data of the uplink SRB2, discarding all PDUs sent by adopting the common mode, and simultaneously, not feeding back any information to the UE; after that, when receiving the PDU in the extended mode, the data reception process is started, that is, only after the data received through the SRB2 successfully reassembles the first SDU (that is, it indicates that the target RNC can correctly receive the data), the normal reception process on the normal mode PDU is resumed, and the PDU in the normal mode received before that is discarded, and it may be necessary to process the PDU in the extended mode while processing the PDU in the extended mode within a period of time, at this time, a timer may be specifically started, and the PDU in the extended mode is not processed after the timer expires, where the setting of the timing length of the timer needs to ensure that the UE correctly sends the extended mode PDU that needs to be sent by the UE may specifically be: determining the timing length of the timer according to the longest time required for transmitting the extended mode PDU and the longest time required for transmitting the corresponding confirmation message by the RNC side, which are set by the UE side; thereafter, the RNC may not process the extended mode PDU under normal circumstances.

An embodiment of the present invention further provides a communication device, whose implementation structure is shown in fig. 4, and specifically includes the following processing units:

(1) a first radio bearer reestablishing unit, configured to reestablish a radio bearer with the second device;

optionally, the communication device may further include a reestablishment message receiving unit, configured to receive a reestablishment message and notify the first radio bearer reestablishment unit to perform a reestablishment operation; or, the first radio bearer unit may also determine, according to a local policy, that bearer reestablishment operation needs to be performed;

(2) a reestablishment notifying unit, configured to send reestablishment indication information to a second device, and notify the second device of information for reestablishing a radio bearer through the reestablishment indication information;

optionally, the reconstruction notification unit may specifically include any one of the following units:

a first notification unit, configured to carry the reconstruction indication information through an extension byte in a message sent to a second device;

and the second notification unit is used for carrying the reconstruction indication information through idle bits or idle bit values in the message sent to the second device.

An embodiment of the present invention further provides another communication device, which is used as a second device to communicate with the communication device that is used as the first device, and receive the reestablishment indication information sent by the communication device, where an implementation structure of the communication device is shown in fig. 5, and specifically may include the following processing units:

(1) a second radio bearer reestablishing unit, configured to reestablish a radio bearer with the first device;

(2) a reestablishment indication receiving unit, configured to receive reestablishment indication information sent by the first device, where the reestablishment indication information is used to indicate that the first device performs an operation of reestablishing a radio bearer;

(3) a data receiving and processing unit, configured to not perform receiving processing on data sent by the first device after the second rb reestablishment unit reestablishes the rb until the reestablishment indication receiving unit receives the reestablishment indication information; after receiving the reconstruction indication information sent by the first device, starting to receive and process the received data sent by the first device;

taking the communication device as a radio network controller of a WCDMA communication system as an example, the corresponding data receiving and processing unit may specifically include the following units:

a first receiving and processing unit, configured to receive and process a received protocol data unit including reconstruction indication information, and obtain a service data unit;

and the second receiving and processing unit is used for starting to receive and process the protocol data unit which is sent by the user equipment as the first equipment and does not carry the reconstruction indication information after the first receiving and processing unit receives a service data unit.

Optionally, the corresponding first receiving and processing unit is further communicated with a timer, and is configured to control to start the timer after the first receiving and processing unit obtains one service data unit, and stop receiving the received protocol data unit carrying the reestablishment indication information and sent by the user equipment after the timer expires.

It should be noted that the communication devices shown in fig. 4 and fig. 5 may be specifically but not limited to be applied in a WCDMA communication system, and the communication device shown in fig. 4 is used as a first device, which may be specifically a user equipment, etc., and the device shown in fig. 5 is used as a second communication device, which may be specifically a radio network controller. Of course, the corresponding communication device can also be applied to other communication systems with similar static migration requirements, so that the corresponding problem is solved, and the success rate of migration is improved.

In summary, according to the embodiments of the present invention, in the static migration process, the target RNC can adopt a suitable data processing manner according to the received reestablishment indication information, thereby avoiding the migration failure and effectively improving the success rate of the static migration.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for increasing migration success rate, comprising:

2. The method of claim 1, wherein the step of sending the reconstruction indication information to the second device comprises:

the reconstruction indication information is carried through an extension byte in the information sent by the first equipment to the second equipment;

or,

and carrying the reconstruction indication information through idle bits or idle bit values in the information sent by the first device to the second device.

3. The method according to claim 1 or 2, wherein the step of sending the re-establishment indication information to the second device in the WCDMA communication system comprises:

after the user equipment serving as the first equipment receives the reconstruction message and completes the reconstruction operation, the reconstruction indication information is carried in a radio link control head of a confirmation mode and is sent to a target radio network controller serving as the second equipment.

4. A method for increasing migration success rate, comprising:

5. The method of claim 4, wherein the step of performing receiving processing on the received data sent by the first device in the WCDMA communication system comprises:

and the radio network controller serving as the second equipment receives the received protocol data unit containing the reconstruction indication information, and starts to receive the protocol data unit which is sent by the user equipment serving as the first equipment and does not carry the reconstruction indication information after acquiring a service data unit.

6. The method of claim 5, wherein after obtaining a service data unit, the method further comprises:

and after a preset time, stopping receiving the protocol data unit which is sent by the user equipment and bears the reconstruction indication information.

7. A communication device, comprising:

8. The communication device according to claim 7, wherein the reestablishment notifying unit specifically includes:

or,

9. The communication device according to claim 7 or 8, further comprising a reestablishment message receiving unit configured to receive a reestablishment message and notify the first radio bearer reestablishment unit to perform the reestablishment operation.

10. A communication device, comprising:

11. The communication device of claim 10, wherein if the communication device is a radio network controller of a WCDMA communication system, the data receiving and processing unit comprises:

12. The communication device according to claim 11, wherein the first receiving processing unit further communicates with a timer, and is configured to control to start the timer after the first receiving processing unit obtains a service data unit carrying reestablishment indication information, and stop receiving the received protocol data unit carrying reestablishment indication information sent from the user equipment after the timer expires.