WO2011026366A1

WO2011026366A1 - Method and system for handover from macro cell to home node b cell

Info

Publication number: WO2011026366A1
Application number: PCT/CN2010/074348
Authority: WO
Inventors: 张现周; 张文英; 李虎虎
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-09-04
Filing date: 2010-06-23
Publication date: 2011-03-10
Also published as: CN102014421B; CN102014421A

Abstract

The present invention discloses a method and system for handover from a macro cell to a Home Node B (HNB) cell, which are used for solving the technical problem that a User Equipment (UE) can not be handed over from a macro cell to an HNB cell. In the present invention, the X2 interface resources are divided into a dynamic part and a static part. During the handover process, according to the identifier, carried by the measurement report, of the HNB cell to which the UE desires to be handed over, the macro Node B uses the dynamic part of the X2 interface to establish an X2 connection to the HNB cell and triggers the handover based on the X2 interface; or, according to the identifier, carried by the measurement report, of the HNB cell to which the UE desires to be handed over, the macro Node B triggers the handover based on an S1 interface. The present invention solves the problem that a UE can not be handed over from a macro cell to an HNB cell, thus the user experience is improved, the system reliability is enhanced, and the service income of operators is increased.

Description

Method and system for switching macro cell to home base station cell

The present invention relates to a Long Term Evolution (LTE) mobile communication system, and in particular, to a handover method and system from a macro cell to a home base station cell. Background technique

The LTE mobile communication system is shown in Figure 1. It mainly includes: a core network (CN) and an access network (E UTRAN). The core network mainly includes a mobility management entity (MME) and a serving gateway (S-GW), and the access network is evolved. The node B (eNodeB, ENB) is formed, and the core network and the access network are interconnected through the interface of the S1 (the interface between the core network and the access network), and the different eNodeBs in the access network are interconnected through the X2 interface. Interoperability.

The macro cell refers to a small area with a relatively large cover area, a relatively large transmission power, and a large number of supported users.

Home Nodeb/eNodeB (HNB) can be installed in homes, elevators, blind spots, business districts (such as airports, cafes, shopping malls, etc.), and the number is huge, and can be powered on and off at any time. . In the network planning, because the number of home base stations is large, it is impossible to set a large number of home base station cells as neighbor cells of the macro cell, which will result in a user equipment in the RRC (Radio Resource Control) connection state (User Equipment, UE) cannot be handed over from the macro cell to the home base station cell, resulting in a problem of user service interruption. Summary of the invention

In view of this, the main object of the present invention is to provide a method and system for macro cell to home base station cell handover, which is used to solve the technical problem that the UE cannot switch from the macro cell to the home base station cell. question.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for switching a macro cell to a home base station cell includes:

The measurement report reported by the UE carries the home base station cell identifier that the UE wants to switch to; the macro base station performs the handover procedure according to the home base station cell identifier that the UE reports to switch to.

Further, the method divides the X2 interface resource into a static part and a dynamic part, and the static part is used to establish an X2 connection between the macro cell and the macro cell; the dynamic part is used to establish an X2 connection between the macro cell and the home base station cell;

After the macro base station receives the measurement report of the UE, the macro base station establishes, between the macro cell and the home base station cell that the UE wants to switch, according to the cell identifier of the home base station cell that the UE wants to switch to, using the dynamic part of the X2 resource. The X2 connection, and then triggers the switching process based on the X2 interface.

Further, the macro base station releases the link of the established X2 interface after completing the handover to the home base station cell by using the dynamic part of the X2 resource.

Further, after the macro base station receives the measurement report of the UE, the macro base station triggers the handover procedure based on the S1 interface according to the cell identifier of the home base station cell that the UE desires to handover.

Further, the measurement report reported by the UE is extended to the measurement report reported by the UE to the macro base station, and at least the cell identification information of the home base station cell that the UE wishes to cut in is carried in the measurement report.

Based on the foregoing method, the present invention further provides a handover system of a macro cell to a home base station cell, including:

The upper 4 艮 module is located at the UE, and is used for measuring the neighboring cell, and determining the home base station cell to which the decision is to be handed over; if the measurement reporting condition is met, reporting to the macro base station, carrying the home base station 'j, the area identifier that the UE wants to switch to Measurement report; The handover module is located at the macro base station, and is configured to perform a handover procedure according to the cell identifier of the home base station cell that the UE that the UE carries in the measurement report after receiving the measurement report of the UE.

Further, the system further includes:

The X2 interface resource management module is configured to divide the X2 interface resource into a static part and a dynamic part in the macro base station, the static part is used to establish an X2 connection between the macro cell and the macro cell, and the dynamic part is used to establish a macro cell to the home base station cell. Between the X2 connections;

After the macro base station receives the measurement report of the UE, the handover module establishes an X2 connection between the macro cell and the home base station cell according to the cell identifier of the home base station cell that the UE needs to switch to in the measurement report, using the dynamic part of the X2 resource. And then trigger the switching process based on the X2 interface.

Further, the switching module releases the link of the established X2 interface after completing the handover to the home base station cell to which the UE wishes to switch, using the dynamic part of the X2 resource.

Further, after receiving the measurement report of the UE, the switching module triggers the S1 interface-based handover procedure according to the cell identifier of the home base station cell that the UE that the UE carries in the measurement report.

Further, the system extends the measurement report reported by the UE, and at least carries the cell identification information of the home base station cell that the UE wants to cut in the measurement report.

The present invention divides the X2 interface resource into dynamic and static parts. When the handover is performed, the macro base station establishes the X2 to the home base station cell by using the X2 interface dynamic part according to the identifier of the home base station cell that the UE is to be handed over in the measurement report. The connection, triggering the switching based on the X2 interface, or switching through the S1 interface, solves the problem that the UE cannot switch from the macro cell to the home base station cell, improves the user experience, improves the system reliability, and increases the operator's Business income. DRAWINGS

1 is a network structure diagram of an LTE mobile communication system;

2 is a flow chart of implementing an X2 interface switching according to the present invention; FIG. 3 is a flow chart of implementing the SI interface switching according to the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

2 is a flowchart of implementing handover by using an X2 interface according to the present invention. The detailed steps are as follows: Step 201: The X2 resource of the macro cell (the cell under the eNB) is divided into two parts: a dynamic part and a static part. The statically configured X2 path is not used between the macro cell and the home base station cell, and the X2 path between the macro cell and the home base station cell is dynamically established by using dynamic X2 resources when needed.

The X2 interface of the dynamic part is dynamically established according to the specific handover needs, and is related to the UE call, and is used for switching to the home base station; the static part X2 interface refers to the X2 interface part that changes unless the device is faulty or the configuration is modified once configured. , used for switching between macro base stations. The division of dynamic and static parts is based on the needs of the business.

Step 202: The UE establishes an RRC connection with the access network, and the UE enters an RRC-CONNECTED state.

Step 203: The macro cell sends a measurement configuration to the UE by using an RRC reconfiguration request message.

Step 204: After receiving the measurement configuration, the UE starts the measurement according to the configuration, and sends an RRC reconfiguration complete message to the eNB.

Step 205: The UE performs measurement on the neighboring cell. When the measurement reporting condition is met, the UE reports a measurement report to the macro cell, where the measurement report includes the home base station cell identifier (ID) that the UE wishes to cut.

Step 206: After receiving the measurement report reported by the UE, the macro cell establishes an X2 connection with the home base station by using the cell ID of the home base station that the UE wants to cut, and the X2 connection uses the dynamic part.

Step 207: After the X2 connection is successfully established, the X2 switching process is triggered.

Step 208: The X2 handover is completed, and the macro cell sends an X2 reset request message to release the X2 connection. Pick up.

Step 209: The home base station receives the X2 reset request message, sends an X2 reset response message, and releases the local X2 connection.

Step 210: The macro cell receives the X2 reset response, and releases the X2 connection on the macro base station side.

Example 2:

3 is a flowchart of implementing handover by using an S1 interface according to the present invention. The detailed steps are as follows: Step 301: The UE establishes an RRC connection with the access network, and the UE enters an RRC-CONNECTED state;

Step 302: The eNB sends a measurement configuration request to the UE by using an RRC reconfiguration request message. Step 303: After receiving the measurement configuration, the UE starts the measurement according to the configuration, and sends an RRC reconfiguration complete message to the eNB.

Step 304: The UE performs measurement on the neighboring cell. When the measurement reporting condition is met, the measurement report is reported to the macro cell (eNB), where the measurement report includes the home base station cell identifier (ID) that the UE wishes to cut.

Step 305: The macro cell receives the measurement report, and initiates the S1 interface switching through the core network by using the cell ID that the UE wants to cut.

This embodiment may be implemented based on a system that dynamically and statically partitions X2 resources, or based on an S1 interface.

The present invention extends the measurement report reported by the UE to the macro base station, and modifies the cell structure of the measurement report in the 3GPP 36.331 protocol version. The specific extension manner is as follows:

MeasResults ::= SEQUENCE

{

Measld Measld,

measResultServCell SEQUENCE {

rsrpResult RSRP-Range,

rsrqResult RSRQ-Range },

measResultNeighCells CHOICE {

measResultListEUTRA MeasResultListEUTRA, measResultListUTRA MeasResultListUTRA, measResultListGERAN MeasResultListGERAN, measResultsCDMA2000 Meas esultsCDMA2000

}

measResultUEExpectCells CHOICE {

measResultUEExpectEUTRAMeasResultEUTRA,

measResultUEExpectUTRA MeasResultUTRA,

measResultUEExpectGERAN MeasResultGERAN

}

The measResultUEExpectEUTRA is used to carry the cell identification information of the LTE home base station cell that the UE wants to cut in. The structure is defined as follows:

MeasResultEUTRA ::= SEQUENCE {

physCellld PhysCellld,

cgi-Info SEQUENCE {

cellGloballd CellGloballdEUTRA, trackingAreaCode TrackingAreaCode,

plmn-IdentityList PLMN-IdentityList2 OPTIONAL } OPTIONAL,

measResult SEQUENCE {

rsrpResult RSRP-Range OPTIONAL, rsrqResult RSRQ-Range OPTIONAL, }

The measResultUEExpectUTRA is used to carry the UTRA home base station cell identification information that the UE wants to cut in. The structure is defined as follows:

MeasResultUTRA ::= SEQUENCE {

physCellld CHOICE {

Fdd PhysCellldUTRA-FDD, tdd PhysCellldUTRA-TDD

},

cgi-Info SEQUENCE {

cellGloballd CellGloballdUTRA,

locationAreaCode BIT STRING (SIZE (16)) OPTIONAL,

routingAreaCode BIT STRING (SIZE (8)) OPTIONAL,

plmn-IdentityList PLMN-IdentityList2

OPTIONAL

} OPTIONAL,

measResult SEQUENCE {

utra-RSCP INTEGER (-5..91)

OPTIONAL,

utra-EcNO INTEGER (0..49)

OPTIONAL,

}

The measResultUEExpectGERAN is used to carry the GSM home base station cell identification information that the UE wants to cut in. The structure is defined as follows:

MeasResultGERAN ::= SEQUENCE { carrierFreq CarrierFreqGERAN,

physCellld PhysCellldGERAN,

cgi-Info SEQUENCE {

cellGloballd CellGloballdGERAN,

routingAreaCode BIT STRING (SIZE (8)) OPTIONAL

} OPTIONAL,

measResult SEQUENCE {

Rssi INTEGER (0..63),

}

After the above-mentioned structure is defined, the UE, after deciding the destination home base station cell that the user wants to switch to, according to the type of the home base station cell, fills in the corresponding structure with the information of the target home base station cell identifier and the measurement result that is to be switched to the macro base station. The macro base station can switch according to the destination home cell identifier included in the measurement report.

The switching system disclosed by the invention can be divided into the following parts in terms of structure:

The upper 4 艮 module is located at the UE, and is used for measuring the neighboring cell, and determining the home base station cell that the user wants to switch to; if the measurement reporting condition is met, sending the home base station 'j, the area identifier that is to be switched to the macro base station measurement report;

The switching module is located at the macro base station, and is configured to perform handover after receiving the measurement report of the UE, according to the cell identifier of the home base station cell that the UE carried in the measurement report wants to handover.

After receiving the measurement report of the UE, the handover module establishes an X2 connection between the macro cell and the home base station cell according to the cell identifier of the home base station cell that the UE needs to switch to in the measurement report, and then establishes an X2 connection between the macro cell and the home base station cell. Triggering a handover process based on the X2 interface; Or, after receiving the measurement report of the UE, the handover module triggers the handover process based on the S1 interface according to the cell identifier of the home base station cell that the UE needs to switch to in the measurement report.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for switching a macro cell to a home base station cell, the method comprising: transmitting, in a measurement report reported by a user terminal (UE), a home base station cell identifier that the UE wishes to handover to;

The macro base station performs a handover procedure according to the home base station cell identifier that the UE reports to switch to.

2. The method according to claim 1, wherein the method divides the X2 interface resource into a static part and a dynamic part, and the static part is used to establish an X2 connection between the macro cell and the macro cell; the dynamic part is used to establish X2 connection between the macro cell and the home base station cell;

3. The method according to claim 2, wherein the link of the established X2 interface is released after the macro base station completes the handover to the home base station cell by using the dynamic part of the X2 resource.

The method according to claim 1, wherein after the macro base station receives the measurement report of the UE, the macro base station triggers the handover procedure based on the S1 interface according to the cell identity of the home base station cell that the UE wishes to handover.

The method according to claim 1, wherein the measurement report reported by the UE is to extend a measurement report reported by the UE to the macro base station, and at least the home base station that the UE wishes to cut into is included in the measurement report. Cell identification information of the cell.

A handover system for a macro cell to a home base station cell, comprising: a measurement upper 4艮 module, located in the UE, configured to measure a neighboring cell, and decide to switch to a home base station cell; if the measurement is satisfied Reporting conditions, reporting to the macro base station that the carrying UE wants to switch Measurement report of the home base station 'j, area identification;

The switching module is located at the macro base station, and is configured to perform a handover procedure according to the cell identifier of the home base station cell that the UE that the UE carries in the measurement report after receiving the measurement report of the UE.

The system according to claim 6, wherein the system further comprises: an X2 interface resource management module, configured to divide the X2 interface resource into a static part and a dynamic part in the macro base station, where the static part is used to establish a macro The X2 connection between the cell and the macro cell; the dynamic part is used to establish an X2 connection between the macro cell and the home base station cell;

8. The system according to claim 7, wherein the switching module releases the link of the established X2 interface after switching to the home base station cell to which the UE wishes to handover, using the dynamic part of the X2 resource.

The system according to claim 6, wherein the switching module, after receiving the measurement report of the UE, triggers the S1 interface based on the cell identifier of the home base station cell that the UE needs to switch to in the measurement report. Switch the process.

The system according to claim 6, wherein the system extends the measurement report reported by the UE, and at least the cell identification information of the home base station area that the UE wishes to cut into is included in the measurement report.