WO2009082860A1

WO2009082860A1 - Cell type informing method and system based on lte system

Info

Publication number: WO2009082860A1
Application number: PCT/CN2008/000007
Authority: WO
Inventors: Yin Gao
Original assignee: Zte Corporation
Priority date: 2008-01-02
Filing date: 2008-01-02
Publication date: 2009-07-09
Also published as: CN101836477B; CN101836477A; CN101810034B; CN101810034A; WO2009086787A1

Abstract

A cell type informing method and system based on LTE system, the method comprises that: a first base station sends an X2 building request message to a second base station, wherein the X2 building request message carries service cell information of one or more service cells of the first base station, and the service cell information contains cell type information; the second base station receives the X2 building request message and saves the service cell information carrying by the X2 building request message.

Description

Long-term evolution based system

TECHNICAL FIELD 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. Background technique

The Long Term Evolution (LTE) network described in 36300-800 is composed of E-UTRAN (Evolved Universal Terrestrial Radio Access Network), Evolved NodeB (eNB), and Evolved Packet Core (EPC) is composed of Evolved Packet Core (EPC). The E-UTRAN includes a set of eNBs connected to the EPC through the S1 interface, and the eNBs can be connected by X2. Among them, Sl and X2 are logical 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. FIG. 1 shows a schematic structural diagram of an LTE network. On the one hand, building and operating a network requires a lot of work, such as planning, configuration, optimization, calculation, adjustment, testing, error prevention, failure reduction, self-recovery, etc. Operators need to reduce operating and maintenance costs. On the other hand, users need to reduce the usage process, such as Home Node B (Home Node B) device, the product that the user wants to purchase is a plug-and-play device, which can automatically obtain configuration operation upon power-on. The trend of the next generation mobile network (The Nest Generation Network, NGN for short) is inevitably self-configuring, self-optimizing, and adaptive. The influence of human factors on the network is getting smaller and smaller. Therefore, the industry has proposed the concept of self-organizing network, self-organization. The 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. The purpose is to improve the handover quality and make the network performance consistent with the network change in time. Currently, in the 3GPP 36.423 protocol, after the inter-base station transmission layer link is established, the base station will initiate an X2 setup request message to the neighboring base station, and if the base station receiving the message successfully processes, it will reply to the X2 setup response message, otherwise the reply X2 establishes a failure response. The establishment request message includes information about all serving cells under the base station, including a cell physical identifier, a global identifier, a TAI,

1 P 17448 Broadcast PLMN (Public Land Mobile Network), frequency and other information. In LTE, since the cell type is more extensive, including a macro cell, a micro cell, a PICO (pico cell) cell, a FEMITO cell, etc., when the terminal makes a handover decision, different handover strategies are used for different types of cell handover, It is necessary to maintain the cell type in the neighbor list. At the same time, the cell information notification in the X2 establishment process has a great influence on the neighbor list. 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, which is established in the X2 process. The medium cell type is notified so that the cell type can be maintained in the neighbor list. According to an aspect 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. The LTE system-based cell type notification method according to the embodiment of 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 one or more serving cells of the first base station The serving cell information, and the serving cell information includes the cell type information; the second base station receives the X2 setup request message, and saves the serving 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 neighboring cell list according to the serving cell information, and recording the cell type information of each serving cell in the neighboring cell list. 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 each serving cell in the neighbor list

2 P 17448 Cell type information. 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 embodiment of 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 the first base station The serving cell information of the one or more 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 cell type information can be included in the serving cell 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 the cell type information of each service 'j, 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 an LTE-based cell type notification method according to an embodiment of the method of the present invention;

3 P17448 3 is a signaling interaction flowchart of an LTE-based cell type notification method according to an embodiment of the method of the present invention; FIG. 4 is a detailed processing flowchart of an example of an LTE-based cell type notification method according to an embodiment of the method of the present invention; 5 is a schematic structural diagram of an LTE-based cell type notification system according to an embodiment of the system of the present invention. As described above, in the LTE system, since there are many cell types, including a macro cell, a micro 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 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 in Χ2 The notification of the serving cell information during the establishment process will affect the establishment of the neighbor list. In view of this, the embodiments of the present invention provide a method and system for cell type notification based on an LTE system, which can maintain a cell type in a neighbor list by notifying a cell type in the 建立2 establishment process. 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. The method embodiment of the present invention provides a cell type notification method based on an LTE system, where the method is used to notify a cell type 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 the Χ2 interface. As shown in FIG. 2, the cell type notification method based on the LTE system according to the embodiment of the present invention includes the following processing (step S202 - step S204): Step S202: The first base station sends a Χ2 setup request to the second base station (Χ2 Setup Request) a message (corresponding to 301 in FIG. 3), where the X2 setup request message carries the serving cell information of one or more serving cells of the first base station, and the serving cell information includes cell type information;

4 P17448 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. Here, Table 1 below shows a schematic diagram of a serving cell information structure according to the related art; Table 2 below shows a schematic diagram of a serving cell information structure according to an embodiment of the present invention.

By comparing Table 1 and Table 2 above, it can be seen that the cells of Table 1 include information such as a cell physical identifier, a global identifier, a TAI, a broadcast PLMN, a frequency, etc., compared to Table 1, an embodiment of the present invention. The cell type cell is further added to the cell information, and the value range is a macro cell, a chi 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 recorded in the neighboring cell list.

5 P 17448 The cell type information of each serving cell is recorded, so that in the subsequent terminal handover process, the appropriate target cell can be selected for the terminal in combination with the information. 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, an X2 Setup Response message (corresponding to 302 in FIG. 3) is returned, where the X2 setup response message may carry one or more serving cells of the second base station. The serving cell information, 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 'I' situation where the processing fails, the second base station returns an X2 Setup Failure message (corresponding to 303 in Fig. 3). The present invention can be better understood by combining the following examples. Assume that there are two base stations that have established a transport layer link, such as eNB1 (first base station) and eNB2 (second base station). As shown in FIG. 4, the cell type notification method in the embodiment of the present invention may be described as follows: Step S402: After the transport layer is established, the eNB1 sends an X2 Setup Request message to the neighboring eNB2, where the request message includes information about all serving cells in the eNB1, and the serving cell information further includes cell type information. Step S404: eNB2 receives The X2 Setup Request message is used to perform the X2 interface establishment process, and the serving cell information of the eNB1 carried therein is stored locally for the generation and maintenance of the neighboring cell list, where each cell has a corresponding cell in the neighboring cell list. Type information; if the processing is successful, proceed to step S406, otherwise, proceed to step S408; Step S406: eNB2 sends an X2 Setup Response message to eNB1, which The information about all the serving cells in the eNB2 is included, and the cell type information is included in the serving cell information. Step S408: The eNB2 sends an X2 Setup Failure message to the eNB1. As can be seen from the above embodiment, the cell type is notified by the X2 establishment process. Information, and maintain cell type information in the neighbor list, and can use cell type information to select a suitable UE

6 P 17448 Switching the target cell, implementing handover decision optimization, and improving the handover success rate. System Embodiment According to an embodiment of the present invention, a cell type notification system based on LTE is provided. As shown in FIG. 5, the system includes a first base station 502 and a second base station 504 that can be connected through 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 d, district information. Preferably, the second base station 504 is further configured to process the X2 setup request message, and if the processing is successful, return an X2 setup response message to the first base station 502, where the X2 setup response message carries the second base station 504. The serving cell information of one or more serving cells and the cell type information can be included in the cell 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. 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.

P 17448

Claims

Claim

A cell type notification method based on a long term evolution system, configured to perform cell type notification after a neighboring or adjacent first base station and a second base station establish a transport layer link, where the first base station and the second base station The method is as follows: 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 one or more of the first base station Serving cell information of the serving cell, and the cell type information is included in the serving cell information;

The second base station receives the X2 setup request message, and saves the service 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:

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.

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, further comprising:

The first base station receives the X2 setup response message, and saves the monthly service '■) and zone 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.

8 P 17448

The method according to claim 3, further comprising: if 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 serving cell 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 the serving cell information of one or more serving cells of the second base station, and the serving cell information can include cell type information.

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 serving cell is recorded in the list.

9 P17448