WO2009086787A1

WO2009086787A1 - Method and system for notifying cell type based on lte

Info

Publication number: WO2009086787A1
Application number: PCT/CN2008/073894
Authority: WO
Inventors: Yin Gao
Original assignee: Zte Corporation
Priority date: 2008-01-02
Filing date: 2008-12-31
Publication date: 2009-07-16
Also published as: CN101810034B; CN101836477B; WO2009082860A1; CN101836477A; CN101810034A

Abstract

A method and a system for notifying cell type based on the LTE system. In the above method, a first BS sends a X2 establishment request message which takes service cell information of one or more service cells of the first BS to a second BS, and the service cell information comprises a cell type information; the second BS receives the X2 establishment request message, and stores the service cell information taken in the X2 establishment request message.

Description

Long-term evolution based system

Cell type notification method and system

The present invention relates to the field of communications, and in particular, to a cell type notification method and system based on a Long Term Evolution (LTE) system. A Long Term Evolution (LTE) network is composed of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network), an Evolved NodeB (eNB), and an evolved packet switching. The center (Evolved Packet Core, referred to as EPC) is composed. FIG. 1 is a schematic structural diagram of an LTE network. As shown in FIG. 1, the E-UTRAN includes a set of eNBs connected to an EPC through an S1 interface, and eNBs can be connected through X2. Among them, Sl and X2 are interfaces. One EPC can manage one or more eNBs, and one Node B can also be controlled by multiple EPCs, and one eNB can manage one or more cells. On the one hand, building and operating a network requires a lot of work, such as planning, configuring, optimizing, calculating, adjusting, testing, preventing errors, reducing failures, self-healing, etc. Operators need to reduce operating and maintenance costs. On the other hand, users need to streamline the usage process, for example, Home Node B (home Node B) device, the product that the user wants to purchase is a plug-and-play device that can automatically obtain configuration operation upon power-on. The next trend of The Nest Generation Network (NGN) is self-configuration, self-optimization, and self-adaptation. The influence of human factors on the network is getting smaller and smaller. Therefore, the industry has proposed the concept of self-organizing network. The organization network includes both self-configuration and self-optimization. Since the neighbor list has a great influence on the handover, the neighbor list is generated as a self-configuration content, and the purpose is to improve the handover quality, so that the network performance is timely matched with the network change. Currently, in the 3GPP 36.423 protocol, after the inter-base station transmission layer link is established, the base station sends an X2 setup request message to the neighboring base station, and if the base station that receives the message successfully processes, the X2 setup response message is returned, otherwise, Reply X2 to establish a failure response. The establishment request message includes information about all serving cells under the base station, and specifically includes a cell physical identifier, a global identifier, TAI, broadcast PLMN (Public Land Mobile Network), frequency and other information. In LTE, the cell type is more extensive, and broadly includes a macro-cell, a micro-cell, a PICO cell, an LTE home base station cell, a FEMITO cell, etc., but in the existing protocol The cell feature can also be described in more detail. For example, the cell coverage, the mobility indicator required by LTE will be fully guaranteed in the cell covered by the radius of 5 kilometers. When the cell radius is increased to 30 kilometers, only the above indicator band To slightly weaken, it is necessary to support mobile subscriber services with a cell coverage of more than 100 kilometers; for example, cell priority, user handover/cell reselection, preferentially select a cell with a higher priority, such as a cell sector, defined in the protocol One station of a macro cell contains three sectors (3 sectors per site), and one station of a cell contains one sector (1 sectors per site); all cell attributes that can distinguish cell types can be used to indicate different cell types. When the terminal performs the handover decision, different handover policies are used for different types of cell handover. Therefore, it is necessary to maintain the cell type in the neighbor list, and the cell information notification in the X2 establishment process has a larger neighbor list. Impact. However, techniques for performing cell type maintenance through the X2 setup process have not yet been implemented. SUMMARY OF THE INVENTION The present invention has been made in view of the problems in the related art that require a cell type maintenance method. To this end, the present invention is directed to a cell type notification method and system based on an LTE system to solve the above problems. In order to achieve the above object, according to an aspect of the present invention, a cell type notification method based on an LTE system is provided, which is used to perform a cell after a neighboring or adjacent first base station and a second base station establish a transport layer link. Type of notification, wherein the first base station and the second base station can connect via the X2 connection. The LTE system-based cell type notification method according to the present invention includes the following process: The first base station sends an X2 setup request message to the second base station, where the X2 setup request message carries the service of the one or more serving cells of the first base station The cell information, and the cell information includes cell type information; the second base station receives the X2 setup request message, and saves the cell information carried in the X2 setup request message. Preferably, after the second base station saves the serving cell information, the method further includes: the second base station establishing and/or maintaining a neighbor list according to the serving cell information, and recording each service in the neighbor list Cell type information of the cell. After the second base station receives the X2 setup request message, the method further includes: the second base station processing the X2 setup request message, and if the processing is successful, returning the X2 setup response message, where the X2 setup response message is carried The serving cell information of the one or more serving cells of the second base station, and the cell type information can be included in the serving cell information; in the case of the processing failure, the X2 establishment failure message is returned. Based on the foregoing, the method may further include: receiving, by the first base station, an X2 setup response message, and saving the serving cell information carried in the X2 setup response message. And, the first base station establishes and/or maintains a neighbor list according to the serving cell information, and records cell type information of each serving cell in the neighbor list. In order to achieve the above object, according to another aspect of the present invention, an LTE-based cell type notification system is provided, the system including a first base station and a second base station that are connectable through an X2 interface. In the LTE-based cell type notification system according to the present invention, the first base station is configured to send an X2 setup request message to the second base station after establishing the transport layer link, where the X2 setup request message carries one of the first base stations Or the serving cell information of the multiple serving cells, and the serving cell information includes the cell type information; the second base station is configured to receive the X2 setup request message of the first base station, and save the serving cell information carried in the X2 setup request message. Preferably, the second base station is further configured to process the X2 setup request message, and if the process is successful, return an X2 setup response message to the first base station, where the X2 setup response message carries one of the second base stations or The serving cell information of the plurality of serving cells, and the serving cell information can include '■!, zone type information. Further preferably, the first base station/second base station is further configured to establish and/or maintain a neighbor list according to the serving cell information, and record cell type information of each service d and the area in the neighbor list. Through the foregoing at least one technical solution provided by the present invention, by adding the cell type information in the X2 setup/response message, the interaction between the neighboring base stations and the serving cell information in the X2 establishment process can be utilized, and the notification of the cell type is added to make the neighbor The area list maintains more comprehensive information (increased cell type), which helps to switch decisions, improve handover success rate, and reduce operator operation and maintenance costs. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawings: FIG. 1 is a schematic diagram of an LTE network structure according to the related art; FIG. 2 is a flowchart of a LTE-based cell type notification method according to an embodiment of the method of the present invention; FIG. FIG. 4 is a detailed processing flowchart of an example of a LTE-based cell type notification method according to an embodiment of the method of the present invention; FIG. 5 is a LTE-based system according to an embodiment of the present invention. Schematic diagram of the cell type notification system. As described above, in the LTE system, since there are many cell types, including a macro cell, an activated cell, a PICO cell, a FEMITO cell, etc., the switching principles between different types of cells are different, and even switching between cells of the same type is performed. Because the authorization (such as the CSG (Closed Subscriber Group) authorization between the home base stations) is different, the handover decision result is different. Therefore, it is necessary to maintain the cell type in the neighbor list, and it is established in Χ2. The notification of the serving cell information in the process will affect the establishment of the neighbor list. In view of this, the embodiments of the present invention provide a method and a system for cell type notification based on an LTE system, which can notify a cell type in the process of establishing a cell, so that the cell type can be maintained in the neighbor list, compared to the present The technical solution provided by the embodiment of the present invention makes the information maintained by the neighbor list more comprehensive, thereby facilitating the handover decision, and improving the handover success rate. Less operator operation and maintenance costs. The preferred embodiments of the present invention are described in the following with reference to the accompanying drawings, which are intended to illustrate and illustrate the invention. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other if they do not conflict. Method Embodiments According to an embodiment of the present invention, a cell type notification method based on an LTE system is provided, where the method is used to perform cell type notification after a neighboring or adjacent first base station and a second base station establish a transport layer link. The first base station and the second base station can be connected through an X2 interface. FIG. 2 is a flowchart of a LTE-based cell type notification method according to an embodiment of the present invention. As shown in FIG. 2, the LTE system-based cell type notification method according to the embodiment of the present invention includes the following processing (step S202- Step S204): Step S202: The first base station sends an X2 Setup Request message (corresponding to 301 in FIG. 3) to the second base station, where the X2 setup request message carries one or more of the first base station. The serving cell information of the serving cell, and the cell information includes the cell type information. In step S204, the second base station receives the X2 setup request message, and saves the serving cell information carried in the X2 setup request message for switching. Among them, Table 1 below shows a serving cell information structure according to the related art; Table 2 below shows a serving cell information structure according to an embodiment of the present invention.

Cell name existence condition range Cell physical address M 0-510 Cell ID M

Macro cell, micro cell, PICO cell, cell type M FEMITO cell, etc.

TAI

M

Broadcast PLMN ID list M 1 to maximum broadcast PLMN number frequency M It can be seen from Table 1 and Table 2 above that the cells in Table 1 include cell physical identifier, global identifier, TAI, broadcast PLMN, frequency, etc. Compared with the table 1, the cell of the cell type is further added to the cell information of the embodiment of the present invention, and the value range is a macro cell, a micro cell, a PICO cell, a FEMITO cell, and the like. Preferably, in step S204, after the second base station saves the serving cell information (or while saving), the neighboring cell list may be established and/or maintained according to the serving cell information, and the cell of each serving cell is recorded in the neighboring cell list. The type information, in this way, in the subsequent terminal handover process, the information can be combined with the information to select a suitable target cell for the terminal. In addition, after the second base station receives the X2 setup request message, the X2 setup request message is processed. On the one hand, in the case that the processing is successful, the second base station returns an X2 Setup Response message (corresponding to 302 in FIG. 3), where the X2 setup response message may carry one or more of the second base station. The serving cell information of the serving cell, and the cell type information can be included in the serving cell information. Similarly, after receiving the X2 setup response message, the first base station may save the serving cell information carried in the X2 setup response message, and establish and/or maintain a neighbor list according to the serving cell information, and record each in the neighbor list. Cell type information of the serving cell. The serving cell information in the X2 setup response message mentioned here also adopts the structure shown in Table 2. On the other hand, in the case where the processing fails, the second base station returns an X2 Setup Failure message (corresponding to 303 in Fig. 3). The invention can be better understood by combining the following examples. It is assumed that there are two base stations that have established a transport layer link, such as eNB 1 (first base station) and eNB 2 (second base station), and FIG. 4 is a detailed example of an example of LTE-based cell type notification method according to an embodiment of the method of the present invention. As shown in FIG. 4, the cell type notification method according to the embodiment of the present invention may be described as follows: Step S402: After the transport layer is established, the eNB1 initiates X2 Setup to the neighboring eNB2.

a request message, the request message includes information about all the serving cells in the eNB1, and the serving cell information includes the cell type information. Step S404: The eNB2 receives the X2 Setup Request message, performs X2 interface establishment processing, and carries the X2 Setup Request message. The serving cell information of the eNB1 is stored locally, and is used for generating and maintaining the neighboring cell list, where each cell has corresponding cell type information in the neighboring cell list; if the processing is successful, the process proceeds to step S406, otherwise, Go to step S408; Step S406: The eNB2 sends an X2 Setup Response message to the eNB1, where the X2 Setup Response message includes information about all serving cells in the eNB2, and the serving cell information further includes cell type information. Step S408: The eNB2 sends an X2 Setup Failure to the eNB1. Message. It can be seen that the cell type information is notified in the X2 establishment process, and the cell type information is maintained in the neighboring cell list, and the cell type information can be used to select a suitable handover target cell for the UE to implement handover decision optimization. Improve the switching success rate. The system embodiment provides an LTE-based cell type notification system according to an embodiment of the present invention. FIG. 5 is a schematic structural diagram of an LTE-based cell type notification system according to an embodiment of the present invention. The system includes a first base station 502 and a second base station 504 that are connectable over an X2 interface. In the LTE-based cell type notification system according to the embodiment of the present invention, the first base station 502 is configured to send an X2 setup request message to the second base station 504 after establishing the transport layer link, where the X2 setup request message carries the first The serving cell information of the one or more serving cells of the base station 502, and the cell type information is included in the serving cell information. The second base station 504 is configured to receive the X2 setup request message of the first base station 502, and save the X2 setup request message. Service cell information. Preferably, the second base station 504 is further configured to process the 建立2 setup request message, and if the processing is successful, return a Χ2 setup response message to the first base station 502, where the 建立2 setup response message carries the second base station 504. The serving cell information of one or more serving cells, and the service 'j, the area information can include cell type information. Further preferably, the first base station 502 / the second base station 504 is further configured to establish and/or maintain a neighbor list according to the serving cell information, and record cell type information of each serving cell in the neighbor list. It should be noted that the various details described in the foregoing method embodiments are also applicable to the system embodiment, and therefore, the repeated description of the same or similar parts is omitted in order not to obscure the present invention. As described above, by means of the present invention, the cell type information is notified in the X2 establishment process, and the cell type information is maintained in the neighbor list, so that the information maintained by the neighbor list is more comprehensive, so that the cell type information can be used as the UE. Select a suitable handover target cell to implement handover decision optimization, improve handover success rate, and reduce operator operation and maintenance costs. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A cell type notification method based on a long term evolution system, where the long term evolution system includes a first base station and a second base station that can be connected through an X2 interface, wherein the method includes:

The first base station sends an X2 setup request message to the second base station, where the X2 setup request message carries serving cell information of one or more serving cells of the first base station, and the serving cell information is Contains cell type information;

The second base station receives the X2 setup request message, and saves the monthly transaction cell information carried in the X2 setup request message.

The method according to claim 1, wherein, after the second base station saves the service cell information, the method further includes:

And the second base station establishes and/or maintains a neighbor list according to the serving cell information, and records cell type information of each serving cell in the neighbor list.

3. The method according to claim 1, wherein, after the second base station receives the X2 setup request message, the method further includes:

The second base station processes the X2 setup request message, and if the process is successful, returns an X2 setup response message, where the X2 setup response message carries one or more of the second base station The serving cell information of the serving cell, and the cell type information can be included in the serving cell information.

4. The method according to claim 3, wherein the method further comprises:

The first base station receives the X2 setup response message, and saves the monthly transaction cell information carried in the X2 setup response message.

The method according to claim 4, wherein, after the first base station saves the serving cell information, the method further includes:

The first base station establishes and/or maintains a neighbor list according to the serving cell information, and records cell type information of each serving cell in the neighbor list.

6. The method according to claim 3, further comprising: in case the processing fails, the second base station returns an X2 setup failure message.

A cell type notification system based on a long term evolution system, the system comprising a first base station and a second base station connectable through an X2 interface, wherein

The first base station is configured to send an X2 setup request message to the second base station after establishing a transport layer link, where the X2 setup request message carries a serving cell of one or more serving cells of the first base station Information, and the cell information includes cell type information;

The second base station is configured to receive an X2 setup request message of the first base station, and save the service 'j, area information carried in the X2 setup request message.

The system according to claim 7, wherein the second base station is further configured to process the X2 setup request message, and if the processing is successful, return an X2 setup to the first base station. a response message, where the X2 setup response message carries monthly service cell information of one or more monthly service cells of the second base station, and the monthly service cell information can include '■! .

The system according to claim 7, wherein the first base station/the second base station is further configured to establish and/or maintain a neighbor list according to the serving cell information, and in the neighboring area The cell type information of each service 'j, zone is recorded in the list.