CN1780481A - Discrimination for service wireless network sub-system transfer by user apparatus - Google Patents

Abstract

The present invention relates to the third-generation mobile communication technology, and discloses a method for user equipment to identify service radio network subsystem migration, so that UE can simply and definitely determine whether SRNS migration occurs, so as to decide whether to stop or rebuild RLC. In the present invention, whether the RNC ID in the IE "New U-RNTI" in the migration message is consistent with the current SRNC ID in the UE is used to determine whether the SRNS has migrated.

Description

Method for User Equipment Identification Service Wireless Network Subsystem Migration

technical field

The invention relates to the third-generation mobile communication technology, in particular to a judgment method for migration of user equipment to a serving wireless network subsystem in a broadband code division multiple access system.

Background technique

After experiencing the first-generation analog system and the second-generation cellular digital mobile system, mobile communication is now moving towards the third-generation mobile communication system represented by wideband code division multiple access (WCDMA) technology. develop.

The Universal Mobile Telecommunications System (UMTS) is the third generation mobile communication system standard formulated by the 3rd Generation Partnership Project (3GPP). The Radio Access Network ("RAN" for short) and the core network (Core Network, "CN" for short) are clearly separated so that the network can carry various types of services to meet the needs of users.

Those skilled in the art should know that the WCDMA system is mainly composed of User Equipment ("UE" for short), UMTS Terrestrial Radio Access Network (UMTS Terrestrial Radio Access Network, "UTRAN" for short) and CN. Figure 1 is a schematic structural diagram of a WCDMA system. As shown in the figure, it is mainly composed of UE10, UTRAN11, CN12, and external network 13. Among them, UE10 and UTRAN11 are connected by Uu interface, and UTRAN11 and CN12 are connected by Iu interface.

UE10 is a user terminal equipment, mainly including a radio frequency processing unit, a baseband processing unit, a protocol stack module, and an application layer software module. UE10 performs data interaction with network equipment through the Uu interface, and provides users with various service functions in circuit domain and packet domain, including common voice, data communication, mobile multimedia, Internet applications, etc. Those skilled in the art should know that the UE10 is various devices with mobile communication functions, such as mobile phones, personal digital assistants (Personal Digital Assistant, PDA for short), notebooks, and the like.

UTRAN11 is responsible for handling all wireless-related functions, and is mainly composed of a base station Node B and a radio network controller (Radio Network Controller, referred to as "RNC"). The Node B includes a wireless transceiver and a baseband processing unit, which is connected to the RNC through a standard Iub interface, and mainly completes the processing of the Uu interface physical layer protocol. The RNC mainly completes functions such as connection establishment and disconnection, handover, macro-diversity combination, radio resource management and control, and different RNCs are connected through an Iur interface. In actual use, usually one RNC and one or more Node Bs form a radio network subsystem (Radio Network Subsystem, "RNS" for short), and the entire UTRAN11 is composed of multiple RNSs.

Figure 2 is a schematic diagram of the internal structure of an RNS. As shown in the figure, it mainly includes RNC20 and Node B21. RNC20 and Node B21 are connected through 1ub interface. Those skilled in the art should know that in actual use, RNS can be divided into two categories: service RNS (Service Radio Network Subsystem, referred to as "SRNS") and drift RNS (Drift Radio Network Subsystem, referred to as "DRNS").

Among them, the SRNS is used to manage the wireless connection between the UE and the UTRAN, and is the termination point of the Iu interface of the UE. The Serving RNC (Service Radio Network Controller, "SRNC") in SRNS is used to implement radio resource management functions such as mapping of radio access bearer parameters to transmission channel parameters, handover, and open-loop power control. A UE connected to UTRAN has one and only one SRNS.

DRNS is the RNS used by the UE in addition to the SRNS, and its corresponding RNC is called Drift RNC (Drift Radio Network Controller, "DRNC" for short). A UE connected to UTRAN may have no DRNS, or may have one or more DRNSs.

CN12 mainly handles all voice calls and data connections in the WCDMA system, and realizes switching and routing functions with external networks. Those skilled in the art should know that CN can be logically divided into a Circuit Switched Domain (CS for short) and a Packet Switched Domain (PS for short). Among them, CS mainly handles functions related to voice calls, and PS mainly handles functions related to data exchange.

The external network 13 may be a circuit switched network (Circuit Switched Network, referred to as "CSN") that provides circuit switched connections, such as an integrated service digital network (Integrated Service Digital Network, referred to as "ISDN"), a public switched telephone network (Public Switched Telephone Network, referred to as " PSTN"), etc.; it can also be a Packet Switched Network (Packet Switched Network, referred to as "PSN") that provides packet switching services, such as the Internet.

In actual use, when the location of the UE changes or resources need to be optimized, it is required to switch the current SRNS corresponding to the UE connected to the UTRAN to another SRNS, which is called SRNS migration. Those skilled in the art should know that SRNS migration can be mainly divided into two types: static migration and accompanying migration.

Among them, the condition for static relocation is that there is a DRNC in the UE connected to UTRAN, and there is basically no need for the UE to participate in the entire relocation process (the RNC needs to tell the UE to update the RLC entity and notify the UE of the new U-RNTI, but the channel of the air interface does not change ), thus also called UE-uninvolved migration. FIG. 3 is a schematic diagram of a static migration process. As shown in the figure, it is mainly composed of CN30, SRNS31, DRNS32 and UE33.

Before static migration occurs, UE33 is connected to DRNS32 through Uu interface, DRNS32 is connected to SRNS31 through Iur interface, and SRNS31 is connected to CN30 through Iu interface.

After the static migration, the system directly converts the DRNS32 to the new SRNS, releases the connection of the Iur interface, and migrates the Iu interface to the new SRNC at the same time. UE34 is connected to CN30 through the new SRNC.

Since both CS and PS domains exist in WCDMA, if the UE is connected to both domains, the two domains need to be migrated at the same time.

Accompanying migration includes hard handoff accompanying migration and forward switching accompanying migration. Hard handover with migration refers to the process in which the UE is handed over from the SRNC to the target RNC while the Iu interface is relocated. Since the UE needs to participate in the migration process, it is also called UE-involved migration. FIG. 4 is a schematic diagram of a process of hard handover accompanied by migration. As shown in the figure, it is mainly composed of CN40, RNS41, SRNS42 and UE43.

Before the hard handover accompanied by migration, UE43 is connected to SRNS42 through Uu interface, and SRNS42 is connected to CN40 through Iu interface.

After hard handover and migration, the system changes the RNS41 to a new SRNS, the Iu interface migrates to the new SRNS, and the UE43 connects to the new SRNS through the Uu interface and then accesses the CN40.

The migration accompanied by forward handover includes migration accompanied by cell update and migration accompanied by URA, which is mainly caused by the change of UE location, so it is similar to the process of migration accompanied by hard handover.

Those skilled in the art should know that the above-mentioned static relocation and relocation accompanied by hard handover are initiated by the network side, and relocation accompanied by forward handover is initiated by the UE side. The air interface messages for static migration are mainly UTRAN Mobility Information messages; the air interface messages for hard handover accompanied by migration mainly include Radio Bearer Setup and Radio Bearer Reconfiguration messages , Radio Bearer Release (RadioBearer Release) message, Transport Channel Reconfiguration (Transport Channel Reconfiguration) message, Physical Channel Reconfiguration (Physical Channel Reconfiguration) message; the air interface messages to realize forward handover accompanying migration mainly include Cell Update Confirmation (Cell Update Confrm) message and URA Update Confirm (URA Update Confirm) message. In this document, the above-mentioned various messages are collectively referred to as migration messages.

After SRNS migration, the radio link control (Radio Link Control, "RLC") serial number on the UE side is different from the new SRNS RLC serial number. In order to ensure that the UE RLC serial number is the same as the new SRNS RLC serial number, it is necessary to UE RLC stops or reestablishes, this operation is triggered when the UE recognizes that the SRNS has relocated. Therefore SRNS migration needs to be identified first.

In the prior art, identification of SRNS relocation is mainly processed in a manner prescribed by 3GPP. 3GPP describes the processing method of the reconfiguration message as follows:

1. If the received reconfiguration message included the IE "Downlink countersynchronisation info"; Or if the reconfiguration message is a Radio BearerReconfiguration and the IE "New U-RNTI" is included:

2. If the variable PDCP_SN_INFO is empty:

Configure the coreesponding RLC entity for all AM and UM radio bearers and AM and UM signaling radio bearers except RB2to“stop”.

Else

Configure the RLC entity for signaling radio bearers RB1, RB3 and RB4 to "stop";

Configure the RLC entity for UM and AM radio bearers for which theIE “PDCP SN Info” is not included to “stop”.

3. Re-establish RB2;

(Chinese can be translated as:

1. If the received reconfiguration message contains information element (Information Element, "IE") "Downlink counter synchronization info", or if the received reconfiguration message is radio bearer reconfiguration containing IE "New U-RNTI" information:

2. If the variable PDCP_SN_INFO is empty

Then configure the RLC entities corresponding to all Affirm Mode ("AM" for short), Un-affirm Mode (Un-affirm Mode, "UM") radio bearers and AM and UM signaling radio bearers except RB2 as stop;

Otherwise, configure the RLC entities corresponding to the signaling transmission radio bearers RB1, RB3, and RB4 to stop, and configure the RLC entities corresponding to the AM UM radio bearers that do not contain the IE "PDCP SN Info" to stop.

3. Rebuild RB2.

)

3GPP describes the processing process of the UTRAN relocation information message as follows:

1. If the received UTRAN Mobility Information message included the IE "Downlink counter synchronization info":

2. If the variable PDCP_SN_INFO is empty:

Configure the corresponding RLC entity for all AM and UM radio bearers and AM and UM signaling radio bearers except RB2to“stop”.

Else

Configure the RLC entity for signaling radio bearers RB1, RB3 and RB4 to "stop";

Configure the RLC entity for UM and AM radio bearers for which theIE “PDCP SN Info” is not included to “stop”.

3. Re-establish RB2;

(Chinese can be translated as:

1. If the received UTRAN migration information message contains IE "Downlink countersynchronisation info":

2. If the variable PDCP_SN_INFO is empty, configure the RLC entities corresponding to all AM UM radio bearers and AM UM signal transmission radio bearers except RB2 to stop; otherwise, configure the RLC entities corresponding to signal transmission radio bearers RB1, RB3, and RB4 Configure to stop, configure the RLC entity corresponding to the AM UM radio bearer that does not contain IE "PDCP SN Info" to stop.

3. Rebuild RB2.

)

3GPP describes the processing procedure of cell update message or URA update message as follows:

1. If the received Cell Update Confirm or URA Update Confirm message included the IE "Downlink counter synchronization info":

2. If the variable PDCP_SN_INFO is empty:

Configure the corresponding RLC entity for all AM and UM radio bearers and AM and UM signaling radio bearers except RB2 to “stop”.

Else

Configure the RLC entity for signaling radio bearers RB1, RB3 and RB4 to "stop";

Configure the RLC entity for UM and AM radio bearers for which theIE “PDCP SN Info” is not included to “stop”.

3. Re-establish RB2;

(Chinese can be translated as:

1. If the received cell update confirmation or URA update confirmation message contains IE "Downlinkcounter synchronization info":

2. If the variable PDCP_SN_INFO is empty:

Then configure the RLC entities corresponding to all AM UM radio bearers and AM UM signaling transmission radio bearers except RB2 to stop;

Otherwise, configure the RLC entities corresponding to the signaling transmission radio bearers RB1, RB3, and RB4 to stop, and configure the RLC entities corresponding to the AM UM radio bearers that do not contain the IE "PDCP SN Info" to stop.

3. Rebuild RB2.

)

From the above description process, it can be seen that except for the radio bearer reconfiguration message which does not have IE "Downlink counter synchronization info" and uses IE "New U-RNTI" to judge UE RLC stop or reestablishment, other migration messages can use IE "Downlink counter synchronization info". info" to judge. In addition, radio bearer establishment, radio bearer release, transmission channel reconfiguration, and physical channel reconfiguration messages are also judged by IE "Downlink counter synchronization info".

In practical application, the above solution has the following problems: Since the IE "Downlink countersynchronization info" is actually a packet data collection protocol (Packet Data Collection Protocol, "PDCP") sequence number, it does not need to be carried in the wireless bearer circuit switching service or signaling If this IE is added purely for the purpose of judging SRNS migration, cell redundancy will result; in addition, the IE "New U-RNTI" in the radio bearer reconfiguration message contains the Service Radio Network Temporary Identifier (Service Radio Network Temporary Identifier, referred to as "S-RNTI") and service radio network controller identifier (Radio Network Subsystem Identity, referred to as "RNC ID"), if the RNC ID remains unchanged and the S-RNTI changes, the UE will also mistakenly believe that it needs to stop or Rebuild the RLCs.

The main reason for this situation is that using ambiguous flags or redundant information to determine whether SRNS relocation occurs may cause the UE to misjudge SRNS relocation or complicate interface signaling messages.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for user equipment to identify the relocation of the serving radio network subsystem, so that the UE can simply and definitely determine whether SRNS relocation occurs, so as to decide whether to stop or re-establish RLC.

To achieve the above object, the present invention provides a method for migrating a user equipment identification service wireless network subsystem, including the following steps:

When the user equipment described in A receives the relocation message from the air interface, it obtains the information element "New U-RNTI" in it, and judges whether the radio network controller identifier in the information element is the same as the serving wireless network in the user equipment The identifiers of the controllers are the same, and if they are different, it is determined that the serving wireless network subsystem has migrated.

It also includes the following steps. When the user equipment receives the relocation message from the air interface, it obtains the judgment conclusion of whether the serving radio network subsystem sends relocation through other methods, and compares it with the judgment conclusion of the step A. If both If the judgment conclusions are consistent, it is confirmed that the serving wireless network subsystem has migrated.

The other method can be judged according to the change of "Downlink counter synchronization info" or "New U-RNTI".

The migration class message includes the following messages:

Radio bearer setup message, radio bearer reconfiguration message, radio bearer release message, transport channel reconfiguration message, physical channel reconfiguration message, UMTS terrestrial radio access network relocation information message, cell update confirmation message, URA update confirmation message Such as the message that can be migrated as stipulated in the 3GPP agreement.

When it is determined that the serving radio network subsystem has migrated, the user equipment stops or reestablishes radio link control on the user equipment side.

The method is applied to wideband code division multiple access system.

By comparison, it can be found that the main difference between the technical solution of the present invention and the prior art is that whether the RNC ID in the IE "New U-RNTI" in the migration class message is consistent with the current SRNC ID in the UE to determine whether the SRNS has migrated .

The difference in this technical solution has brought obvious beneficial effects, that is, the use of RNC ID to judge the migration of SRNS can effectively reduce the misjudgment of migration by user equipment, and there is no need to use different judgment standards according to different migration messages. Since all migration messages contain the above two flags, there is no need to carry "Downlink counter synchronization info" when there is no PS service, which can effectively reduce the size of air interface signaling and reduce signaling redundancy.

Description of drawings

Fig. 1 is a schematic structural diagram of a WCDMA system;

Figure 2 is a schematic diagram of the internal structure of an RNS;

Fig. 3 is a schematic diagram of the process of static migration;

Fig. 4 is a schematic diagram of the process of migration accompanied by hard handover;

FIG. 5 is a flow chart of realizing SRNS relocation by UEs in the same CN in a WCDMA system according to an embodiment of the present invention;

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

Since the radio bearer setup message, radio bearer reconfiguration message, radio bearer release message, transport channel reconfiguration message, physical channel reconfiguration message, UTRAN relocation information message, cell update confirmation message, and URA update confirmation message all contain IE "U-RNTI" of the UE. Those skilled in the art should know that IE "New U-RNTI" is 32 bits, its upper 12 bits are S-RNTI, and its lower 20 bits are RNC ID. The RNC ID is the unique identifier of the RNS in the Public Land Mobile Network ("PLMN"). When sending SRNS migration, the RNC ID will change. Therefore, it can be determined whether the UE RLC is connected by judging whether the RNC ID has changed. Need to stop or update.

Fig. 5 is a flow chart of realizing SRNS relocation of a UE in the same CN in a WCDMA system according to an embodiment of the present invention, as shown in the figure.

First enter step 510, the UE receives the relocation message sent by the Uu interface, the relocation message may be a radio bearer establishment message, a radio bearer reconfiguration message, a radio bearer release message, a transmission channel reconfiguration message, a physical channel reconfiguration message, One of UTRAN relocation information message, cell update confirmation message, and URA update confirmation message.

Then enter step 520, judge whether the RNCID of IE "New U-RNTI" in the received migration class message changes, if change, then enter step 530, otherwise enter step 540. Those skilled in the art should know that the judgment of the RNC ID change is to compare the newly received RNC ID with the original RNC ID previously stored in the UE, if they are the same, they think that there is no change, otherwise they think that there is a change.

In step 530, UE RLC stops or reestablishes.

In step 540, the UE RLC keeps the original state unchanged.

In addition, if IE "Downlink counter synchronization info" is used as a sign to judge the migration, the RNC ID can also be used to check the validity.

In a preferred embodiment of the present invention, the UE can first use the method in the prior art (for example, judge according to the change of IE "Downlink counter synchronization info" or IE "New U-RNTI") to determine whether the SRNC occurs. Migrate to make a judgment conclusion, and then make a second judgment conclusion by the method proposed by the present invention-by the RNC ID in IE "New U-RNTI", compare the two judgment conclusions, if consistent, the previous judgment conclusion is legal, Corresponding follow-up processing can be carried out, such as UE RLC stops or rebuilds, etc. If they are inconsistent, corresponding error processing can be carried out according to the preset settings.

The main benefit of using the method of the present invention for legality checking is that it can be compatible with current protocols.

Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein, and without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. the method for a subscriber equipment discrimination for service wireless network sub-system transfer is characterized in that, comprises following steps:

When the described subscriber equipment of A is received migration class message from air interface, obtain information element " New U-RNTI " wherein, and judge that the radio network controller identifier in this information element is whether identical with service wireless network controller identifier in this subscriber equipment, if difference then judge that migration has taken place SRNS Serving Radio Network Subsystem.

2. the method for subscriber equipment discrimination for service wireless network sub-system transfer according to claim 1, it is characterized in that, also comprise following steps, when described subscriber equipment is received migration class message from air interface, obtain the SRNS Serving Radio Network Subsystem judgement conclusion whether deportation moves by other method, and judge that with described steps A conclusion compares, if two are judged that conclusions are consistent, confirm that then migration has taken place described SRNS Serving Radio Network Subsystem.

3. the method for subscriber equipment discrimination for service wireless network sub-system transfer according to claim 2 is characterized in that, other method of the described acquisition SRNS Serving Radio Network Subsystem judgement conclusion whether deportation moves comprises following steps:

If comprise information element " counts down synchronizing information " in the described migration class message, judge that then migration has taken place SRNS Serving Radio Network Subsystem.

4. the method for subscriber equipment discrimination for service wireless network sub-system transfer according to claim 2 is characterized in that, other method of the described acquisition SRNS Serving Radio Network Subsystem judgement conclusion whether deportation moves comprises following steps:

If comprise information element " New U-RNTI " in the described radio bearer reconfiguration message, judge that then migration has taken place SRNS Serving Radio Network Subsystem.

5. according to the method for each described subscriber equipment discrimination for service wireless network sub-system transfer in the claim 1 to 4, it is characterized in that described migration class message comprises following message:

Radio bearer is set up message, radio bearer reconfiguration message, radio bearer release message, transmission channel reconfiguration message, physical channel reconfiguration message, Universal Mobile Telecommunications System land radio access web migration information message, cell update acknowledge message, universal mobile telecommunications system grounding wireless access network registration area renewal acknowledge message.

6. the method for subscriber equipment discrimination for service wireless network sub-system transfer according to claim 5, it is characterized in that, when judging that migration has taken place SRNS Serving Radio Network Subsystem, described subscriber equipment stops or rebuilding the wireless link control of this user equipment side.

7. the method for subscriber equipment discrimination for service wireless network sub-system transfer according to claim 1 is characterized in that, described method is applied to broadband CDMA system.

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