CN102111900A - Method and system for establishing radio resource control (RRC) connection and mobile terminal - Google Patents

Abstract

The present invention discloses a method, system, and mobile terminal for establishing a radio resource control connection. The system includes user equipment and a radio network controller, and the user equipment is configured to request the radio network controller to establish a radio resource control connection. , indicating other systems that the user equipment can support; and redirecting to the cell indicated by the radio network controller; the radio network controller, when instructing the user equipment to redirect, instruct the user equipment Cell information in supported systems. The present invention enables the system network side to clearly know the capabilities of different systems supported by the UE. When the RNC is overloaded, it can indicate redirection to the user equipment, and redirect the RRC connection to the idle system of other systems that the user equipment can support. In the cell, optimize the structure of the redirection information element, improve the access speed of the user equipment, and improve the system performance.

Description

A method, system, and mobile terminal for establishing a radio resource control connection

technical field

The present invention relates to a wireless communication system, in particular to a method, a system and a mobile terminal for establishing a radio resource control connection.

Background technique

When a user equipment (User Equipment, referred to as UE) attempts to access the Universal Mobile Telecommunications System (Universal Mobile Telecommunications System, referred to as UMTS) through a radio resource control connection request (RRCConnection Request) message, the initially accessed radio network controller (Radio Network Controller) , referred to as RNC) is overloaded, the radio network controller will send a radio resource control connection rejection (RRC Connection Reiect) message to the UE to reject the UE's access, and indicate in the redirection information element that the UE can be redirected access area. This redirection information element can carry the cell information of the system, that is, the UMTS system, or the cells of other systems such as Global System for Mobile Communications (GSM for short), Long Term Evolution (LTE for short), etc. information, so that the UE can automatically select re-access.

When the RNC receives the RRC Connection request message, the RNC does not know whether the UE to be accessed supports the capabilities of other GSM and LTE systems. When there are other idle UMTS cells and idle GSM and LTE cells, the RNC cannot accurately judge How to send redirection information to the UE; if the RRC connection rejection message sent only carries the redirection information of the GSM cell, and the UE supports the LTE system but not the GSM system at this time, then the load of the UE on the local RNC will be reduced Previously, there were problems such as being unable to access, unable to make normal calls, etc. If the RRC connection rejection message delivered only carries the redirection information of the LTE cell, and the UE supports the GSM system but not the LTE system at this time, it will also cause the UE to be unable to access and make normal calls before the load of the RNC is reduced. question.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method, system and mobile terminal for establishing a radio resource control connection, so as to increase the access speed of user equipment and improve system performance.

In order to solve the above problems, the present invention provides a method for establishing a radio resource control connection, including: when the user equipment requests the radio network controller to establish the radio resource control connection, indicate other systems that the user equipment can support.

Further, the above method also has the following characteristics;

When instructing the user equipment to redirect, the radio network controller indicates cell information in a system supported by the user equipment, and the user equipment is redirected to the cell indicated by the radio network controller.

Further, the above method also has the following characteristics;

When the load exceeds the threshold set by the system, the radio network controller sends a radio resource control connection rejection message to the user equipment, and indicates in the redirection information element of the message that the system supported by the user equipment community information.

Further, the above method also has the following characteristics;

The redirected cell indicated by the radio network controller to the user equipment belongs to the current system accessed by the user equipment or other systems supported by the user equipment.

Further, the above method also has the following characteristics;

Other systems that the user equipment can support are one or more of the following systems: Global System for Mobile Communications, Universal Mobile Communications System, and Long Term Evolution System.

In order to solve the above problems, the present invention also provides a system for establishing a radio resource control connection, including a user equipment and a radio network controller; the user equipment is configured to, when requesting the radio network controller to establish a radio resource control connection, Indicate other systems that the user equipment can support in the radio resource control connection request message; and redirect to the cell indicated by the radio network controller; the radio network controller is used to indicate redirection to the user equipment , indicating the cell information in the system supported by the user equipment.

Further, the above system also has the following characteristics;

The radio network controller is further configured to send a radio resource control connection rejection message to the user equipment when the load exceeds the threshold set by the system, and indicate in the redirection information element of the message that the user equipment supports cell information in the system.

Further, the above system also has the following characteristics;

The system is Global System for Mobile Communications or Universal Mobile Communications System or Long Term Evolution System.

In order to solve the above problems, the present invention also provides a mobile terminal for establishing a radio resource control connection, the mobile terminal is configured to, in the radio resource control connection request message Indicate other systems that the user equipment can support; it is also used to redirect to the cell indicated by the radio network controller after receiving the radio resource control connection reject message sent by the radio network controller.

In order to solve the above problems, the present invention also provides a radio network controller for establishing a radio resource control connection; the radio network controller is configured to, after receiving the radio resource control connection request sent by the mobile terminal, learn other systems that the mobile terminal can support, and indicate cell information in the system supported by the user equipment when indicating redirection to the user equipment.

In the present invention, when the user equipment requests the radio network controller to establish an RRC connection request, it directly indicates other systems that the user equipment can support, so that the system network side can clearly know the UE's ability to support different systems, and the RNC is overloaded. In this way, the redirection information element of the RRC connection rejection message can be used to indicate redirection to the user equipment, and the RRC connection can be redirected to an idle cell of another system that the user equipment can support, so as to optimize the structure of the redirection information element and improve the efficiency of the user equipment. access speed and improve system performance.

Description of drawings

Fig. 1 is a flowchart of a method for establishing a radio resource control connection in an embodiment.

Detailed ways

In an embodiment, a system for establishing a radio resource control connection includes a radio network controller and a user equipment. This user equipment is typically a mobile terminal. The system is Global System for Mobile Communications or Universal System for Mobile Communications or Long Term Evolution System.

The user equipment is configured to, when requesting the radio network controller to establish the radio resource control connection, indicate in the radio resource control connection request message other systems that the user equipment can support; and redirect to the radio network controller indicated district. Specifically, after receiving the radio resource control connection rejection message sent by the radio network controller, redirect to the cell indicated in the message.

The radio network controller is configured to, after receiving the radio resource control connection request sent by the mobile terminal, learn from the request message other systems that the mobile terminal can support, and when instructing the user equipment to redirect, instruct Cell information in the system supported by the user equipment; specifically, when the load exceeds the threshold set by the system, send a radio resource control connection rejection message to the user equipment, and indicate in the redirection information element of this message Cell information in the system supported by the user equipment.

As shown in Figure 1, the method for establishing a radio resource control connection includes:

Step 101, when the user equipment requests the radio network controller to establish a radio resource control connection request, it indicates other systems that the user equipment can support.

For example, when the current system is the UMTS system, the user equipment indicates whether it supports the GSM system and/or the LTE system in the radio resource control connection establishment request sent to the radio network controller.

The structure of the radio resource control connection establishment request message (RRC CONNECTIONREQUEST) is shown in the following table:

Information Element/Groupname need Multi Type and reference Semanticsdescription Version Message Type (message type) MP MessageType Radio Bearer Ies Predefined configuration status information MP Boolean True indicates theUE has all pre-configurationsstored with the same value tag asbroadcast in the cell in which theRRC connectionestablishmentisinitiated REL-5 UE information elements ......... Support of MAC-i/is OP Enumerated(TRUE) The absence of this IE indicates that the UE does not supportMAC-i/isoperation. REL-8

Support of GSM (support GSM system) OP Enumerated(TRUE) The absence of this IE indicates that the UE does not support GSMoperation. Support of E-URTA (support LTE system) OP Enumerated(TRUE) The absence of this IE indicates that the UE does not support LTEoperation.

In the above table, the Support of GSM unit is used to indicate whether the user equipment supports the GSM system, and the Support of E-URTA unit is used to indicate whether the user equipment supports the LTE system. When the user equipment only supports the GSM system, the radio resource control connection establishment request message sent by the UE to the RNC includes only the Support of GSM unit; when the user equipment only supports the LTE system, the radio resource control connection establishment request message sent by the UE to the RNC only includes the Support of GSM unit Including the Support of E-URTA unit; when the user equipment supports both GSM and LTE systems, the radio resource control connection establishment request message sent by the UE to the RNC includes both the Support of GSM unit and the Support of E-URTA unit.

When the current system where the user equipment is located is the LTE system, similar to the above, according to the relevant protocols of the LTE system, the RRC connection establishment request message may include Support of GSM and/or Support of UMTS units. When the user equipment only supports the GSM system, the radio resource control connection establishment request message sent by the UE to the RNC includes only the Support of GSM unit; when the user equipment only supports the UMTS system, the radio resource control connection establishment request message sent by the UE to the RNC includes only the Support of GSM unit Including the Support of UMTS unit; when the user equipment supports both GSM and UMTS systems, the radio resource control connection establishment request message sent by the UE to the RNC includes both the Support of GSM unit and the Support of UMTS unit.

Step 102: When instructing the user equipment to redirect, the radio network controller indicates cell information in the system supported by the user equipment.

Specifically, when the load exceeds the threshold set by the system, the radio network controller sends a radio resource control connection rejection message to the user equipment, and indicates the system supported by the user equipment in the redirection information element of the message. The cell information in .

The redirected cell indicated by the radio network controller to the user equipment belongs to the current system accessed by the user equipment or other systems supported by the user equipment.

Step 103, the user equipment is redirected to the cell indicated by the radio network controller, and the procedure ends.

Other systems that the user equipment can support are one or more of the following systems: Global System for Mobile Communications, Universal Mobile Communications System, and Long Term Evolution System.

In this method, the cell information carried by the RNC in the radio resource control connection establishment rejection message includes the cell information in the system supported by the UE. For example, only the UE that supports the GSM system capability will consider sending the cell information including the GSM system. , For UEs that support the LTE system capability, the cell information that includes the LTE system will be considered, so that after the UE is rejected for the initial access, it can be redirected to the correct and appropriate cell in time to ensure normal calls.

Specific embodiment one:

In the LTE system, a UE that supports both UMTS and GSM capabilities is redirected to a GSM cell by the RNC.

Step 1, UE sends a radio resource control connection establishment request message to RNC, and indicates in this message that it supports both UMTS and GSM;

Step 2, the RNC knows that the UE supports both UMTS and GSM, and in the case of overload, it decides to redirect the UE to the GSM cell, sends a radio resource control connection establishment rejection message to the UE, and puts it in the redirection information element Clearly indicate the information of the GSM cell;

In step 3, the UE tries to access other GSM cells and succeeds.

Specific embodiment two:

In the LTE system, a UE that supports both UMTS and GSM capabilities is redirected to a UMTS cell by the RNC.

Step 1, UE sends a radio resource control connection establishment request message to RNC, and indicates in this message that it supports both UMTS and GSM;

Step 2: The RNC knows that the UE supports both UMTS and GSM. In the case of overload, the RNC decides to redirect the UE to another UMTS cell, sends a radio resource control connection establishment rejection message to the UE, and sends a message in the redirection information element The information that clearly indicates the UMTS cell in ;

In step 3, the UE tries to access other UMTS cells and succeeds.

Specific embodiment three:

In an LTE system, a UE that supports UMTS but does not support GSM capabilities is redirected to a UMTS cell by the RNC.

Step 1, UE sends a radio resource control connection establishment request message to RNC, and indicates in this message that it only supports UMTS;

Step 2. The RNC knows that the UE only supports UMTS. In the case of overload, it determines that the UE cannot be redirected to the GSM cell, but it can redirect the UE to other UMTS cells. After sending the RRC connection establishment to the UE Reject the message, and explicitly indicate the information of the UMTS cell in the redirection information element;

In step 3, the UE tries to access other UMTS cells and succeeds.

Specific embodiment four:

In the GSM system, a UE that supports both UMTS and LTE capabilities is redirected to an LTE cell by the RNC.

Step 1, UE sends a radio resource control connection establishment request message to RNC, and indicates in this message that it supports both UMTS and LTE;

Step 2, the RNC knows that both UMTS and LTE are supported, and in the case of overload, it determines that the UE can be redirected to the LTE cell, sends a radio resource control connection establishment rejection message to the UE, and specifies in the redirection information element Indicates the information of the LTE cell;

In step 3, the UE tries to access other LTE cells and succeeds.

Specific embodiment five:

In the GSM system, a UE that supports both UMTS and LTE capabilities is redirected to a UMTS cell by the RNC.

Step 1, UE sends a radio resource control connection establishment request message to RNC, and indicates in this message that it supports both UMTS and LTE;

Step 2, RNC knows that UMTS and LTE are supported at the same time, and in the case of overload, it determines that the UE can be redirected to another UMTS cell, and sends a radio resource control connection establishment rejection message to the UE, and in the redirection information element Information that clearly indicates the UMTS cell;

In step 3, the UE tries to access other UMTS cells and succeeds.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A method for establishing a radio resource control connection, characterized in that, When the user equipment requests the radio network controller to establish the radio resource control connection, it indicates other systems that the user equipment can support. 2. The method of claim 1, wherein When instructing the user equipment to redirect, the radio network controller indicates cell information in a system supported by the user equipment, and the user equipment is redirected to the cell indicated by the radio network controller. 3. The method of claim 2, wherein When the load exceeds the threshold set by the system, the radio network controller sends a radio resource control connection rejection message to the user equipment, and indicates in the redirection information element of the message that the system supported by the user equipment community information. 4. The method of claim 2 or 3, wherein, The redirected cell indicated by the radio network controller to the user equipment belongs to the current system accessed by the user equipment or other systems supported by the user equipment. 5. The method according to claim 2 or 3, characterized in that, Other systems that the user equipment can support are one or more of the following systems: Global System for Mobile Communications, Universal Mobile Communications System, and Long Term Evolution System. 6. A system for establishing a radio resource control connection, comprising a user equipment and a radio network controller, characterized in that, The user equipment is configured to indicate other systems that the user equipment can support in a radio resource control connection request message when requesting the radio network controller to establish a radio resource control connection; and redirect to the radio network controller the indicated district; The radio network controller is configured to indicate cell information in a system supported by the user equipment when instructing the user equipment to redirect. 7. The system of claim 6, wherein: The radio network controller is further configured to send a radio resource control connection rejection message to the user equipment when the load exceeds the threshold set by the system, and indicate in the redirection information element of the message that the user equipment supports cell information in the system. 8. The system of claim 7, wherein: The system is Global System for Mobile Communications or Universal Mobile Communications System or Long Term Evolution System. 9. A mobile terminal for establishing a radio resource control connection, characterized in that, The mobile terminal is configured to indicate other systems that the user equipment can support in a radio resource control connection request message when requesting the radio network controller to establish a radio resource control connection; After the radio resource control connection rejection message sent by the controller, redirect to the cell indicated by the radio network controller. 10. A radio network controller for establishing a radio resource control connection, characterized in that, The radio network controller is configured to, after receiving the radio resource control connection request sent by the mobile terminal, learn from the request message other systems that the mobile terminal can support, and when instructing the user equipment to redirect , indicating cell information in the system supported by the user equipment.

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