WO2011057535A1

WO2011057535A1 - Method and terminal for searching base station

Info

Publication number: WO2011057535A1
Application number: PCT/CN2010/078291
Authority: WO
Inventors: 陈琳; 谢峰; 刘扬; 鲁照华; 宋建全
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-11-13
Filing date: 2010-11-01
Publication date: 2011-05-19
Also published as: JP2013503526A; CN102065520B; CN102065520A

Abstract

The present invention discloses a method and a terminal for searching a base station. According to the obtained information of the base stations, the terminal filters out the base stations that do not satisfy a preset base station selection condition, and goes on scanning the other base stations until detects the base station that meets the base station selection condition. Using the technical solution of the present invention, the terminal does not need to perform the search according to the integrity base station information of each base station, and the base station that the terminal cannot access is filtered out in advance; it enables rapid and inerrant access to the base station, greatly improves the wireless communication system capability for scanning, accessing and switching, and decreases the overhead of the communication and the terminal.

Description

Base station search method and terminal

The present invention relates to a terminal access technology in a wireless communication system, and in particular, to a base station search method and a terminal. Background technique

In a wireless communication system, a base station refers to a device that provides services to a terminal, and the base station and the terminal perform wireless communication by electromagnetic waves. Through the base station, the wireless communication system can provide wireless coverage for terminals of a certain geographical range, and this geographical range is called a cell.

In general, wireless communication systems need to deploy base stations with a large coverage in order to be able to provide wireless communication to users on a large scale. Such a base station is generally called a Macro Base Station (Mac), and the cell covered by it is usually called a Macro Cell. At the same time, the wireless communication system needs to provide users with higher quality wireless communication services in certain environments or scenarios, taking into account different needs of users and different usage environments. Some base stations with small coverage and low transmission power are thus used. . These small base stations include a small base station (Micro BS), a micro base station (Pico BS), and a Femto BS (which may also be referred to as a home base station or a personal base station).

A macro base station can cover a maximum area of 2-3 km, while the coverage of the base station does not exceed 30 meters. Due to the huge difference in coverage, a large number (several hundred or even thousands) of base stations may be deployed within the coverage of the macro base station to improve the quality of communication services in the room. The maximum number of users that can be simultaneously accessed by the base station is usually 6 To eight. The base station is usually divided into two types: open and proprietary. The proprietary base station includes some proprietary base stations and all proprietary base stations. Among them, the open base station can access any user without exceeding the maximum number of users; all proprietary base stations are only open to proprietary users; and some proprietary base stations can guarantee proprietary user services. The quality allows for access to other non-proprietary users. As shown in Figure 1, Figure 1 shows the existing A schematic structural diagram of a wireless communication system including a child base station composed of a macro base station. In a wireless communication system consisting of a macro base station, when the terminal accesses the network or re-enters the network, the terminal scans the nearby base station to find a suitable base station and access. When a large number of child base stations are deployed in the coverage of the macro base station, the following three characteristics exist in the child base station: 1) the coverage of the base station is small; 2) the base station is dense; 3) the proprietary base station may The terminal cannot be accessed. This makes the original terminal access process start to be complicated. Therefore, in this environment, when the terminal detects or scans the base station, it should control the overhead as much as possible, and reduce unnecessary scans as much as possible to reduce the overall switching overhead.

In the current system, when searching for a base station, the terminal needs to first parse the secondary synchronization sequence to determine the cell type. For the proprietary secondary base station, the terminal further needs to parse the base station identifier (BS-ID) in the secondary superframe header and check Whether the BS-ID is included in the white table of the terminal itself to determine whether the base station can be accessed. The problem with this method is that for a proprietary child base station, the complete secondary superframe header must be parsed to determine if the terminal can access. In this way, in the case where the dedicated child base station is dense, the scanning method of the existing terminal searching the base station is likely to need to be repeated many times, the scanning efficiency is reduced, and the overall switching overhead is increased, thereby increasing the access cost of the entire network. Summary of the invention

In view of this, the main object of the present invention is to provide a base station search method and a terminal, which can implement a fast and error-free access of a terminal to a base station.

Another object of the present invention is to provide a terminal that can implement fast and error-free base station access, greatly improve the scanning, accessing, and handover performance of the wireless communication system, and reduce the access overhead of the entire network.

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

The present invention provides a base station search method, which pre-sets a base station selection condition, and further includes: the terminal, according to the obtained base station information, screening a base station that does not satisfy a preset base station selection condition, and continuing to scan other base stations until it detects that the base station selection is satisfied. The condition of the base station.

In the above method, the base station information includes a cell identifier, and/or a base station identifier, and/ Or base station status indication information.

In the above method, the terminal, according to the obtained base station information, screens out the base station that does not satisfy the preset base station selection condition as:

After the downlink synchronization, the terminal displays the current base station as a proprietary child base station according to the cell identifier carried in the obtained secondary synchronization sequence, and the terminal searches for the white table saved by itself. There is a corresponding cell identifier. If not, the terminal screens the base station as an inappropriate base station and continues to scan other base stations.

In the above method, if the white table has a corresponding cell identifier, the method further includes: obtaining, by the terminal, base station status indication information carried by the first sub-packet of the secondary super-frame header sent by the base station, and determining whether the cell is forbidden If the base station status indication information indicates that the cell is forbidden to access, the terminal lists the base station as an inappropriate base station screening, suspends the current cell search, and re-initiates the process of scanning other base stations.

In the above method, after the terminal obtains the base station status indication information carried in the first sub-packet of the secondary super-frame header sent by the base station, if the base station status indication information indicates that the cell is allowed to access, the method further includes:

The terminal interprets the lower 12 bits of the base station identifier in the first sub-packet of the secondary super-frame header, and determines whether it is included in the white list of the terminal. If not, the terminal lists the base station as an inappropriate base station sieve. In addition, the process of scanning other cell sites is re-initiated by suspending the current cell search.

In the above method, if the lower 12 bits of the base station identifier are included in the white list of the terminal, the method further includes:

The terminal acquires the upper 36 bits of the base station identifier carried in the second sub-packet of the secondary super-frame header, and determines, according to the complete base station identifier, whether the current child-care base station is a proprietary child-care base station accessible by the terminal, if If not, the terminal lists the base station as an inappropriate base station screening, suspends the current cell search and re-initiates the process of scanning other base stations; if yes, the terminal detects the base station that satisfies the base station selection condition, selects the base station, and enters Access status. In the foregoing method, before the method, the method further includes: the terminal updating the white table saved by itself, specifically:

When the self-organizing network server allocates a new cell identifier to the private cell site, the ad hoc network server sends the new cell identifier to the affected terminal through the air interface method, and the terminal updates the white table information saved by itself. .

In the above method, when the base station type indicates that the current base station is an open child base station or a macro base station, and the base station status indication information indicates that the cell is allowed to access, the terminal directly starts the access process.

A terminal includes a setting module, a judging module, and an access module; wherein, a base station selection condition is preset in the setting module;

a judging module, configured to receive base station information, screen out a base station that does not satisfy a preset base station selection condition according to the received base station information and a base station selection condition preset in the setting module, and continue to scan other base stations; When the base station selects a condition, sending an access notification to the access module;

The access module is configured to receive an access notification from the determining module, and start a terminal access process. In the foregoing terminal, the base station accessed by the terminal includes a macro base station, a small base station, a micro base station, and a child base station;

The child base station comprises an open child base station, a proprietary child base station, wherein the proprietary child base station comprises a part of a proprietary child base station, and all the proprietary child base stations.

As can be seen from the technical solution provided by the present invention, the terminal screens the base station that does not satisfy the preset base station selection condition according to the obtained base station information, and continues to scan other base stations until accessing the base station that satisfies the base station selection condition. The method of the present invention excludes the proprietary child base station that the terminal cannot access according to the order of the base station information acquisition time, that is, if the base station information obtained earlier does not satisfy the base station selection condition, the base station is directly listed as inappropriate. The base station screens out and re-initiates the process of scanning other base stations, and no longer judges the base station information obtained later. The method for searching a base station of the present invention does not require the terminal to perform searching according to the complete base station information of each base station. The base station that the terminal cannot access is eliminated in advance, and the fast and error-free base station access is realized, which greatly improves the scanning, accessing and switching performance of the wireless communication system, and reduces the communication and terminal overhead. DRAWINGS

1 is a schematic structural diagram of a conventional wireless communication system including a base station composed of a macro base station;

2 is a schematic flowchart of a method for implementing a base station search according to the present invention;

3 is a schematic flowchart of implementing an embodiment of a base station in FIG. 2 that searches for a base station that satisfies a base station selection condition according to the obtained base station information according to the present invention;

4 is a schematic structural diagram of a terminal of the present invention;

FIG. 5 is a schematic flowchart of a first embodiment of performing base station search by using base station information according to the present invention; FIG. 6 is a schematic flowchart of a second embodiment of performing base station search by using base station information according to the present invention; FIG. 8 is a schematic flowchart of a fourth embodiment of performing base station search by using base station information according to the present invention; FIG. 9 is a schematic flowchart of a fifth embodiment of performing base station search by using base station information according to the present invention; FIG. 10 is a schematic flowchart diagram of a sixth embodiment of performing base station search by using base station information according to the present invention; FIG.

FIG. 11 is a schematic flowchart diagram of an embodiment of updating a white table saved by a terminal according to the present invention. detailed description

The basic idea of the present invention is: The base station selection condition is set in advance, and the terminal screens out the base station that does not satisfy the preset base station selection condition according to the obtained base station information, and continues to scan other base stations until the base station that satisfies the base station selection condition is detected.

2 is a schematic flowchart of a method for implementing a base station search according to the present invention. As shown in FIG. 2, the method includes:

Step 200: Set a base station selection condition in advance. In this step, the base station selection conditions are many, and are set according to the configuration of the system. Here, just to name a few examples, it is not intended to limit the scope of protection of the present invention. such as:

For a base station in which the cell is forbidden to access, the terminal lists the base station as an inappropriate base station, suspends the current cell search, and re-initiates the scanning process; or

For the base station to which the cell is allowed to access, and the terminal detects that the base station is a macro base station or a child base station that is in the network type, the terminal directly starts the access process; or

For the base station to which the cell is allowed to access, if the terminal detects that the base station is a proprietary child base station, the terminal needs to determine whether the base station is a proprietary base station that can be accessed according to the white table maintained by itself and the obtained base station information. Wait.

Step 201: The terminal screens out the base station that does not satisfy the preset base station selection condition according to the obtained base station information, and continues to scan other base stations until the base station that satisfies the base station selection condition is detected.

The base station information includes, but is not limited to, a cell identifier (Cell-ID), and/or a base station identifier (BS-ID), and/or base station status indication information and the like.

In this step, according to the obtained base station information, it is determined whether the corresponding base station satisfies the preset base station selection condition, and the specific implementation includes:

When the terminal synchronizes in the downlink, the primary synchronization sequence and the secondary synchronization sequence are acquired. The cell-ID carried by the secondary synchronization sequence includes the type of the base station and/or the type of the network access, and the terminal can perform the first base station screening according to the preset base station selection condition according to the information:

When the base station type indicates that the current base station is a proprietary child base station, the terminal searches for a corresponding Cell-ID in the white table saved by itself, and if not, the terminal filters the base station as an inappropriate base station and continues to scan other base stations. If there is a corresponding Cell-ID in the whitelist, enter the second base station screening:

The terminal then obtains a primary sub-frame header and a first sub-packet or a second sub-packet of the secondary super-frame header sent by the base station; if the first sub-packet of the auxiliary super-frame header is obtained first, the terminal is first according to the auxiliary super-frame header. Child The base station status indication information carried by the packet determines whether the cell prohibits access. If the base station status indication information indicates that the cell prohibits access, the terminal filters the base station as an inappropriate base station, suspends the current cell search, and re-initiates scanning other base stations. the process of;

If the base station status indication information indicates that the cell is allowed to access, enter the third base station screening: the terminal according to the white table maintained by itself and the first sub-packet of the interpreted auxiliary super-frame header

The lower 12 bits of information of the BS-ID, whether it is included in the white list of the terminal, if not, the terminal lists the base station as an inappropriate base station screening, suspends the current cell search, and re-initiates the process of scanning other base stations. If yes, the terminal enters the fourth base station screening:

The terminal further obtains the upper 36-bit information of the BS-ID carried in the second sub-packet of the auxiliary super-frame header, and determines whether the current sub-base station is a proprietary access terminal according to the complete BS-ID (48-bit information). The base station, if not, the terminal lists the base station as an inappropriate base station screening, suspends the current cell search and re-initiates the process of scanning other base stations; if yes, the terminal detects the base station that satisfies the base station selection condition, and the terminal selects The base station, and enters the access state.

It should be noted that, from the time of obtaining the information of the base station, the cell type and the Cell-ID information are the earliest acquired, and the base station status indication information and the lower 12 bits of the BS-ID and the BS-ID are 36 bits higher. The acquisition time is indefinite. Generally, the second sub-packet transmission period of the secondary superframe header is larger than that of the first sub-packet, so generally, the base station status indication information of the first sub-packet from the secondary super-frame header and the lower 12 of the BS-ID are obtained first. The bit information is then obtained by the higher 36-bit information of the BS-ID of the second sub-packet of the secondary superframe header. In the present invention, the order of obtaining the first sub-packet and the second sub-packet is not limited.

The method of step 201 of the present invention further includes: when the base station type indicates that the current base station is an open base station or a macro base station, and the base station status indication information indicates that the cell allows access, the access procedure is directly started.

It can be seen from the implementation of step 201 that the method of the present invention excludes the proprietary child base station that the terminal cannot access according to the order of the base station information acquisition time, that is, if the base station obtained earlier is obtained. If the information does not satisfy the selection condition of the base station, the base station is directly listed as an inappropriate base station, and the process of scanning other base stations is re-initiated, and the base station information obtained later is no longer judged. The method for searching a base station of the present invention does not require the terminal to perform searching according to the complete base station information of each base station, and eliminates the base station that the terminal cannot access in advance, thereby realizing fast and error-free base station access, and greatly improving scanning and access of the wireless communication system. And switching performance, reducing communication and terminal overhead.

Before the method of the present invention, the method further includes:

The terminal may be authenticated by a prior online or offline authorization and configured to access certain proprietary base stations; the terminal maintains an accessible private base station white table containing the BS-ID of the proprietary base station and / or Cell-ID information of the cell to which the base station belongs;

When the terminal searches for the base station for network access or network reentry, the terminal first performs frequency sweeping on all supported frequency bands, selects the strongest frequency point, and then starts the downlink synchronization process involved in steps 200 to 201 of the present invention.

FIG. 3 is a schematic flowchart of an embodiment of the present invention for implementing a base station that satisfies a base station selection condition according to the obtained base station information, and as shown in FIG. 3, the embodiment includes the following steps:

Step 300 to step 301: Scan the synchronization sequence, and the terminal completes physical layer synchronization with the target base station. Step 302: Determine whether the type of the base station that the terminal tends to select is consistent with the type of the currently scanned base station. If yes, go to step 303; otherwise, go back to step 300 to step 301.

A priority list for indicating the type of base station to which the terminal accesses is stored in advance in the terminal, and the base station having the higher priority indicates that the terminal is more likely to access. The cell identifier range shows the type of base station currently scanned.

Step 303: Acquire a primary superframe header and a first subpacket of the secondary superframe header.

Step 304: Determine whether the cell prohibition information bit in the first sub-packet is 0. If yes, go to step 305, otherwise return to step 300 to step 301. Here, the H no cell barring information bit is 0 to indicate no prohibition, and the cell barring information bit is 1 to indicate disabling. Step 305: Acquire other sub-packets of the auxiliary super-frame header for further analysis. The third and fourth base station selections are included, and will not be described here.

Step 306: Complete synchronization with the target base station.

In order to achieve the above method, the present invention further provides a terminal. FIG. 4 is a schematic structural diagram of a terminal of the present invention. As shown in FIG. 4, the terminal of the present invention mainly includes: a setting module, a judging module, and an access module; A base station selection condition is preset in the module;

a judging module, configured to receive base station information, screen out a base station that does not satisfy a preset base station selection condition according to the received base station information and a base station selection condition preset in the setting module, and continue to scan other base stations; When the base station selects a condition, it sends an access notification to the access module.

The access module is configured to receive an access notification from the determining module, and start a terminal access process. The base station includes a macro base station, a small base station, a micro base station, and a child base station; the child base station includes an open base station and a proprietary child base station, wherein the proprietary base station includes a part of a proprietary base station, and all the private base stations.

The method of the present invention will be described in detail below by taking a WiMAX communication network as an example in combination with the embodiments.

FIG. 5 is a schematic flowchart of the first embodiment of the present invention for performing base station search by using base station information. In the first embodiment, the terminal detects that the current base station type is a proprietary base station according to the secondary synchronization sequence. The terminal searches for a corresponding Cell-ID obtained from the secondary synchronization sequence in the white table. If the Cell-ID exists, it continues to perform a search and judgment according to other base station information that affects the terminal access, otherwise the terminal bases the base station. Screened out as inappropriate base stations and continues to scan other base stations. As shown in FIG. 5, this embodiment includes the following steps:

Step 500: The terminal detects the synchronization sequence and acquires Cell-ID information.

Step 501: The terminal checks whether there is a corresponding Cell-ID in the white table. If it can be found, it proceeds to step 502; otherwise, the terminal lists the base station as an inappropriate base station and screens it, and continues to scan it. His base station.

Step 502: The terminal detects other base station information that affects the access of the terminal.

FIG. 6 is a schematic flowchart of a second embodiment of the present invention for performing base station search by using base station information. In the second embodiment, the terminal determines that the base station status indication information is obtained during the base station scanning process, and determines whether the cell is set according to the base station status indication information. Forbidden, if yes, it indicates that the base station does not want to have terminal access at this time, the terminal lists the base station as an inappropriate base station and screens out, and continues to scan other base stations; otherwise, the terminal continues to detect other base station information that affects the terminal access. . As shown in Figure 6, this embodiment includes the following steps:

Step 600: The terminal detects the first sub-packet of the secondary superframe header and acquires the base station status indication information. Step 601: The terminal determines whether the cell prohibition information bit is prohibited. If the cell prohibition information bit is 1, the terminal lists the base station as an inappropriate base station and screens out, and continues to scan other base stations; otherwise, the process proceeds to step 602.

Step 602: The terminal detects other base station information that affects the access of the terminal.

FIG. 7 is a schematic flowchart of a third embodiment of performing base station search by using base station information. In the third embodiment, the terminal detects that the current base station type is a proprietary base station according to the secondary synchronization sequence, and then The terminal starts detecting the BS-ID in the primary superframe header and the secondary superframe header. If the first sub-packet of the secondary superframe header is detected first, the terminal can obtain the lower 12 bits of the BS-ID. The terminal looks up the white table to determine whether it contains the lower 12 bits of the same BS-ID. If there is such a BS-ID, the terminal continues to detect other information affecting the terminal access; otherwise, the terminal lists the base station as an inappropriate base station. While screening, continue to scan other base stations. As shown in FIG. 7, this embodiment includes the following steps:

Step 700: The terminal detects the first sub-packet of the secondary superframe header and obtains the lower 12 bits of the BS-ID.

Step 701: The terminal checks whether there is information about the lower 12 bits of the BS-ID in the white table. If yes, the process proceeds to step 702: Otherwise, the terminal lists the base station as an inappropriate base station, and continues to scan. Describe other base stations.

Step 702: The terminal detects other base station information that affects the access of the terminal.

FIG. 8 is a schematic flowchart of a fourth embodiment of the present invention for performing base station search by using base station information. In the fourth embodiment, the terminal detects that the current base station type is a proprietary base station according to the secondary synchronization sequence, and then The terminal starts detecting the BS-ID in the primary superframe header and the secondary superframe header. Assuming that the second sub-packet of the secondary superframe header is detected first, the terminal can obtain the upper 36 bits of the BS-ID. The terminal searches for a high 36-bit information of the same BS-ID as the obtained BS-ID in the white table. If yes, the terminal continues to detect other information affecting the terminal access, otherwise the terminal lists the base station as an inappropriate base station. While screening, continue to scan other base stations. As shown in FIG. 8, the embodiment includes the following steps:

Step 800: The terminal detects the upper 36 bits of the BS-ID in the second sub-packet of the secondary superframe header. Step 801: The terminal searches whether the white table has the highest 36-bit information of the same BS-ID. If it can be found, the process proceeds to step 802. Otherwise, the terminal lists the base station as an inappropriate base station, and continues to scan other base stations. .

Step 802: The terminal detects other base station information that affects terminal access.

FIG. 9 is a schematic flowchart of a fifth embodiment of the present invention for performing base station search by using base station information. In the fifth embodiment, the terminal assumes that the base station type is a proprietary base station and the secondary superframe header is detected first. The lower 12 bits of the BS-ID in the first sub-packet, and then the higher 36-bit information of the BS-ID in the second sub-packet, that is, the terminal obtains the complete 48-bit BS-ID. The terminal checks whether there is a 48-bit BS-ID matching in the white table (same as the obtained complete 48-bit BS-ID), and if present, the terminal enters an access procedure; otherwise, the terminal lists the base station as an inappropriate base station. While screening, continue to scan other base stations.判断 Using the complete BS-ID to make a judgment is a preferred embodiment, and it is possible to accurately find a proprietary child base station that the terminal can actually access. As shown in FIG. 9, this embodiment includes the following steps:

Step 900: The terminal obtains the first sub-packet and the second sub-packet of the auxiliary super-frame header. The entire 48-bit BS-ID information.

Step 901: The terminal searches whether there is a matching complete 48-bit BS-ID information in the white table. If it can be found, it proceeds to step 902; otherwise, the terminal lists the base station as an inappropriate base station and screens out, and continues to scan other base stations. .

Step 902: The terminal enters an access state and accesses the current base station.

FIG. 10 is a schematic flowchart diagram of a sixth embodiment of performing base station search by using base station information according to the present invention. As shown in FIG. 10, the embodiment includes the following steps:

Step 1000: When the terminal searches for the base station for network access or network reentry, the terminal first performs frequency sweeping on all supported frequency bands, selects the strongest frequency point, and performs scanning and downlink synchronization.

Step 1001 to step 1002: Detect the Cell-ID in the secondary synchronization sequence, and determine the type of the base station currently scanned.

In this step, if it is determined that the currently scanned base station type is a macro base station, the process proceeds to step 1003. If it is determined that the currently scanned base station type is an open child base station, the process proceeds to step 1004. It is determined that the currently scanned base station type is The proprietary base station proceeds to step 1005.

Step 1003: Determine whether the terminal tends to select a proprietary base station, and if yes, return steps

1000 continues scanning; otherwise, proceeds to step 1006.

Step 1004: Determine whether the terminal tends to select a proprietary child base station. If yes, return to step 1000 to continue scanning; otherwise, proceed to step 1006.

Step 1005: Determine whether the terminal can access the proprietary child base station and find the corresponding Cell-ID in the white list. If yes, go to step 1006, otherwise return to step 1000 to continue scanning.

Step 1006: Check the main superframe header.

Step 1007 to step 1008: detecting a cell forbidden information bit in the first sub-packet of the secondary superframe header. In this embodiment, if the cell prohibition information bit is 1, it indicates that the information is prohibited, and returns to step 1000; if the cell prohibition information bit is 0, indicating permission, proceeds to step 1009.

Step 1009: If the currently scanned base station is a macro base station or an open base station, enter the step 1010: If the currently scanned base station is a dedicated child base station, go to step 1011.

Step 1010: The terminal detects the base station that satisfies the selection condition of the base station, and the terminal selects the base station and enters an access state, and the process ends. If it is found that the base station is not suitable for base station scanning, it returns to step 1000.

Step 1011: Detect the first sub-packet of the secondary superframe header, and parse the lower 12 bits of the BS-ID.

Step 1012: Determine whether the lower 12 bits of the corresponding BS-ID can be found in the white table of the terminal. If it cannot be found, return to step 1000 to continue scanning; if it can be found, go to step 1013.

Step 1013 to step 1014: Detect the second sub-packet of the secondary superframe header, and parse the upper 36 bits of the BS-ID. Determine whether the matching 48-bit BS-ID can be found in the white table of the terminal. If it can be found, go to step 1015; otherwise, return to step 1000 to continue scanning.

Step 1015: The terminal detects the base station that satisfies the selection condition of the base station, and the terminal selects the base station and enters an access state. If the base station is not suitable in the subsequent access process, it may return to step 1000 to continue scanning.

FIG. 11 is a schematic flowchart of an embodiment of updating a white table saved by a terminal according to the present invention. As shown in FIG. 9, the embodiment includes the following steps:

Step 1100: The terminal requests to join or quit the proprietary base station.

The terminal can actively request to join or quit the proprietary base station.

Step 1101: The proprietary base station sends a request processing decision message to the terminal.

After the authorization of the proprietary base station, the proprietary base station can inform the terminal of its processing decision by means of a message.

Step 1102: The terminal receives the processing decision message and updates its own white table.

According to the processing decision, if the proprietary child base station agrees to join the terminal, the terminal adds a new record in the white table saved by itself, including the BS-ID of the proprietary child base station and the optional Cell-ID information; correspondingly, If the proprietary child base station agrees that the terminal exits no longer accepts the service, the terminal deletes the information related to the proprietary child base station in the white list. The white table of the terminal must contain BS-ID information, and the Cell-ID is optional. In order to speed up the base station search, the white table contains Cell-ID information as a preferred embodiment.

In addition, the Cell-ID information of the proprietary base station can be obtained by the terminal through a self-organizing network (SON) server. Adjacent cell sites will generally be assigned different Cell-IDs to prevent collisions. Since the topology of the cell of the base station generally does not change much, the SON server can keep the Cell-ID of the proprietary base station unchanged for a long time. If the SON server needs to assign a new Cell-ID to the private base station, the affected terminal can be notified by the air interface (OTA) method to update the corresponding white table information.

In addition, the proprietary base station can also add or delete its own service group through active configuration, and inform the terminal that the terminal updates its own saved white table information accordingly. If the proprietary base station is used by the user to another location, a new Cell-ID may be assigned. For this reconfiguration, only the SON server needs to send the new Cell-ID to the OTA method. The affected terminal, so that it updates the white table accordingly.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention.

Claims

Claim

A base station search method, characterized in that a base station selection condition is set in advance, the method further comprising:

The terminal screens out the base station that does not satisfy the preset base station selection condition according to the obtained base station information, and continues to scan other base stations until the base station that satisfies the base station selection condition is detected.

The base station search method according to claim 1, wherein the base station information comprises a cell identifier, and/or a base station identifier, and/or base station status indication information.

The base station search method according to claim 2, wherein the terminal screens the base station that does not satisfy the preset base station selection condition according to the obtained base station information as:

The base station search method according to claim 3, wherein if the white table has a corresponding cell identifier, the method further includes:

The terminal obtains the base station status indication information carried by the first sub-packet of the secondary super-frame header sent by the base station, and determines whether the cell prohibits the access. If the base station status indication information indicates that the cell prohibits the access, the terminal lists the base station as inappropriate. The base station screens out, suspends the current cell search and re-initiates the process of scanning other base stations.

The base station search method according to claim 4, wherein after the terminal obtains the base station status indication information carried by the first sub-packet of the secondary super-frame header sent by the base station, if the base station status indication information is displayed The cell allows access, and the method further includes:

The base station search method according to claim 5, wherein if the lower 12 bits of the base station identifier are included in the white list of the terminal, the method further includes:

The terminal acquires the upper 36 bits of the base station identifier carried in the second sub-packet of the secondary super-frame header, and determines, according to the complete base station identifier, whether the current child-care base station is a proprietary child-care base station accessible by the terminal, if If not, the terminal lists the base station as an inappropriate base station screening, suspends the current cell search and re-initiates the process of scanning other base stations; if yes, the terminal detects the base station that satisfies the base station selection condition, selects the base station, and enters Access status.

The base station search method according to any one of claims 3 to 6, wherein before the terminal selects the base station according to the obtained base station information, the method further includes: the terminal updating the white table saved by itself;

The update is: when the self-organizing network server allocates a new cell identifier to the dedicated child base station, the self-organizing network server sends the new cell identifier to the affected terminal through the air interface method, and the terminal updates itself. Saved white table information.

The base station search method according to claim 3, wherein when the base station type displays that the current base station is an open base station or a macro base station, and the base station status indication information indicates that the cell allows access, the terminal directly starts. Access process.

A terminal, comprising: a setting module, a determining module, and an access module; wherein, the setting module has a base station selection condition preset;

The access module is configured to receive an access notification from the determining module, and start a terminal access process.

The terminal according to claim 9, wherein the base station accessed by the terminal comprises a macro base station, a small base station, a micro base station, and a child base station; The child base station includes an open child base station and a proprietary child base station, wherein the proprietary child base station includes a part of a proprietary base station and all the proprietary base stations.