WO2011085616A1 - 无线通信系统中仔基站发现方法、切换预处理方法及终端 - Google Patents

无线通信系统中仔基站发现方法、切换预处理方法及终端 Download PDF

Info

Publication number
WO2011085616A1
WO2011085616A1 PCT/CN2010/078912 CN2010078912W WO2011085616A1 WO 2011085616 A1 WO2011085616 A1 WO 2011085616A1 CN 2010078912 W CN2010078912 W CN 2010078912W WO 2011085616 A1 WO2011085616 A1 WO 2011085616A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
terminal
neighboring
child
neighboring base
Prior art date
Application number
PCT/CN2010/078912
Other languages
English (en)
French (fr)
Inventor
谢峰
陈琳
鲁照华
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2011085616A1 publication Critical patent/WO2011085616A1/zh

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/02Arrangements for optimising operational condition
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835Determination of neighbour cell lists
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/045Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • Base station discovery method for handover preprocessing method and terminal in wireless communication system
  • the present invention relates to the field of wireless communication technologies, and in particular, to a method for detecting and switching pre-processing of a base station in a wireless communication system, and a terminal.
  • 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.
  • the wireless communication system can provide wireless coverage for terminals of a certain geographical range through a base station, and this geographical range is called a cell.
  • 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.
  • a base station is generally called a macro base station (Macro BS), and its covered cell is usually called a macro cell, and a macro base station can cover an area of 2-3 kilometers.
  • the wireless communication system deploys some base stations with small coverage and low transmission power in consideration of different needs and usage environments of the users, thereby providing users with higher quality wireless communication services in certain specific environments or scenarios.
  • These small base stations include a micro base station (Micro BS), a pico base station (Pico BS), and a femto base station (Femto BS, also referred to as a home base station or a personal base station).
  • Micro BS micro base station
  • Pico BS pico base station
  • Femto BS femto base station
  • Fig. 1 is a block diagram showing the structure of a wireless communication system including a base station composed of a macro base station.
  • the different types of user access networks provide different sub-base station partitioning strategies, which are usually divided into open sub-base stations and proprietary sub-base stations.
  • the open base station allows any user to access without exceeding the maximum number of users.
  • the proprietary base station includes a fully proprietary base station and a semi-proprietary base station. Fully proprietary base stations are only open to proprietary users, while semi-proprietary base stations allow access to other non-proprietary users while maintaining the quality of proprietary user services.
  • terminals In order to ensure service continuity and quality of service, terminals often need to switch between base stations during the mobile process. As shown in FIG. 1, when the terminal B moves from the coverage area of the macro base station A to the coverage area of the macro base station B, the terminal needs to switch from the macro base station A to the macro base station B; and when the terminal A is from the macro base When the coverage area of the station A moves to the coverage area of the child base station A, in order to achieve efficient resource utilization, the terminal can switch from the macro base station A to the child base station A to alleviate the load of the macro base station A.
  • the handover is generally performed by the serving base station first transmitting the system parameter information of the neighboring base station, the terminal measuring the neighboring base station, and then determining whether the handover is needed according to the handover threshold and the measurement result, and if the handover is required, the terminal and the serving base station and the target base station complete the message through the message. Switching the interaction of parameters, and finally the terminal synchronizes with the target base station to resume data transmission.
  • a large number of child base stations are deployed in the coverage of the macro base station.
  • the serving base station broadcasts a neighbor list (NBR-ADV) message in the existing system. Only the macro base station and the open child base station information adjacent to the serving base station are sent, and the proprietary child base station information is sent only when the serving base station receives the neighboring area request (NBR-REQ) message of the terminal or is actively advertised by the serving base station. Broadcast to send. Therefore, when the terminal moves to the coverage area of the proprietary base station, the proprietary base station is found only by blind scanning or scanning based on white table information or location information.
  • the technical problem to be solved by the present invention is to provide a method for discovering a base station, a method for switching a pre-processing, and a terminal in a wireless communication system, which can save the processing overhead of the terminal and prevent the terminal from attempting to switch to the abutted base station.
  • the present invention provides a method for discovering a child base station in a wireless communication system, comprising: when a terminal communicates with a current serving base station, measuring a synchronization sequence at the same frequency as the current serving base station, and discovering according to the synchronization sequence There are adjacent base stations.
  • the step of the terminal measuring a synchronization sequence at the same frequency as the current serving base station includes: acquiring a secondary synchronization sequence and/or cell identification information.
  • the step of determining whether there is an adjacent child base station according to the synchronization sequence comprises: the terminal determining the base station type according to the secondary synchronization sequence and/or the cell identification information, and if the base station type is a child base station, the terminal finds that there is an adjacent child base station.
  • the terminal pre-stores a mapping relationship between a base station type configured by the system and a secondary synchronization sequence or a cell identifier, and determines a base station type according to the mapping relationship.
  • the method further includes: after the terminal discovers the neighboring base station, performing handover pre-processing, determining the accessibility of the neighboring base station, and performing corresponding processing according to the judgment result.
  • the terminal determines the accessibility of the neighboring base station according to the combination of any one or more of the following information: the type of the base station, the current serving base station Signal quality, whether the terminal tends to access the base station, white table information, and whether there are other alternative base stations.
  • the step of performing corresponding processing according to the judgment result includes: if the terminal determines that the neighboring base station is accessible, the terminal initiates scanning of the neighboring base station; if the terminal determines that the neighboring base station is inaccessible, the terminal maintains the current serving base station The communication or selection switches to other base stations.
  • the present invention further provides a method for pre-processing a handover of a base station in a wireless communication system, including: the terminal performs handover pre-processing after discovering the neighboring base station, and determines that the neighboring base station is accessible. Sex, and according to the judgment results, the corresponding processing.
  • the terminal determines the accessibility of the neighboring base station according to the combination of any one or more of the following information: The signal quality of the serving base station, whether the terminal tends to access the child base station, white table information, and whether there are other alternative base stations.
  • the terminal determines that the neighboring base station is accessible: the neighboring base station type is an open child base station, And the terminal tends to access the child base station; the neighboring base station is a proprietary type of child base station, and the terminal has white table information; the neighboring base station is a semi-proprietary child base station or an open child base station, and the signal quality of the current serving base station is poor.
  • the terminal determines that the neighboring base station is not connectable
  • the neighboring base station is an open base station, but the terminal does not tend to access the child base station, and the communication quality of the terminal with the serving base station is good at this time;
  • the neighboring base station is an open base station, but the terminal does not tend to connect
  • the base station is entered, and the signal quality of the terminal is poor with the serving base station, but the terminal has other candidate base stations;
  • the neighboring base station is a completely proprietary base station, but the terminal has no white table information; Some base stations, but the terminal does not have white table information.
  • the communication quality of the current serving base station of the terminal is good;
  • the neighboring base station is a semi-proprietary child base station, and the current service base station of the terminal has poor service quality, but the terminal has other equipment. Select the base station.
  • the step of the terminal performing the corresponding processing according to the determination result includes: if the terminal determines that the neighboring abutting base station is accessible, the terminal initiates scanning of the adjacent child base station; if the terminal determines that the neighboring child base station is inaccessible, the terminal maintains The communication or selection of the current serving base station is switched to other base stations.
  • the method further includes: before the terminal initiates scanning of the neighboring base station or initiates a handover request to access the neighboring child base station, the method further includes: And sending a neighboring cell request message to the current serving base station, and acquiring a neighboring cell list message that is sent by the serving base station and containing the information of the proprietary cell site.
  • the step of the terminal initiating scanning of the neighboring base station includes: Step 1: The terminal sends a scan request message to the current serving base station to request scanning of the neighboring base station; Step 2, the terminal sends a scan response message according to the received current serving base station The neighboring base station is scanned, and it is determined whether the neighboring base station is suitable for access. If it is suitable for access, the terminal initiates handover.
  • the terminal requests different scanning intervals according to the type of the neighboring base station.
  • the step of the terminal initiating the handover includes: Step a, the terminal sends a handover request message to request to switch to the neighboring base station; Step b, after receiving the handover command message of the neighboring base station, the terminal re-enters the network Adjacent base station.
  • the handover request message sent by the terminal includes the neighboring base station information.
  • the terminal sends a handover request message to the current serving base station to request to switch to the adjacent child base station;
  • the step of the terminal initiating the handover further includes: after the current serving base station receives the handover request of the terminal, the current serving base station negotiates with the neighboring base station whether to allow the terminal to access; The current serving base station sends a handover command message to the terminal, indicating whether the neighboring neighboring base station allows access.
  • the step of negotiating, by the serving base station, the neighboring base station to allow the terminal to access includes: the serving base station sending a handover request message to the neighboring child base station; if the neighboring child base station is a proprietary child base station, according to the corresponding The user group information and/or the base station identification information determine whether the terminal is allowed to access; the neighboring base station returns a handover response message to the serving base station.
  • the present invention also provides a terminal for discovering a neighboring base station, including a measurement module and a judgment module, where:
  • the measuring module is configured to: when the terminal communicates with the current serving base station, measure a synchronization sequence at the same frequency as the current serving base station;
  • the determining module is configured to: discover whether there is an adjacent child base station according to the synchronization sequence.
  • the terminal further includes a handover pre-processing module, which is configured to: determine the accessibility of the neighboring base station, and call the corresponding module to perform processing according to the determination result.
  • a handover pre-processing module which is configured to: determine the accessibility of the neighboring base station, and call the corresponding module to perform processing according to the determination result.
  • the present invention further provides a terminal for implementing handover pre-processing, including a judging module and a switching pre-processing module, where:
  • the determining module is configured to: determine whether the neighboring base station is a child base station, if the switching pre-processing module is invoked;
  • the switching pre-processing module is configured to: determine the accessibility of the neighboring base station, and call the corresponding module for processing according to the judgment result.
  • the method of the present invention measures the synchronization sequence of the neighboring base stations of the same frequency by the terminal, and determines the type of the neighboring base station according to the synchronization sequence. If the presence of the child base station is found, the terminal actively initiates the scanning and the handover request to access the child base station. In this way, the terminal can avoid the periodic scanning of the neighboring base stations before the handover, so that the terminal discovers the neighboring base stations and actively accesses with little overhead, thereby improving the handover efficiency of the base station of the wireless communication system, and reducing the communication and the terminal.
  • Overhead BRIEF abstract
  • FIG. 1 is a schematic diagram of a base station handover of a background wireless communication system according to the present invention
  • FIG. 2 is a flowchart of a terminal detecting a neighboring base station by measuring a synchronization sequence of the same frequency
  • FIG. 3 is a flowchart of determining the accessibility of an adjacent child base station after the terminal discovers the adjacent child base station; Access flow chart;
  • FIG. 5 is a flowchart of a terminal sending a scan and a handover request to an adjacent base station
  • FIG. 6 is a flow chart of determining whether a neighboring base station is suitable for access according to a scan result;
  • FIG. 7 is a flow chart of the serving base station determining whether to allow the terminal to switch to an adjacent proprietary base station.
  • the inventive concept is that the terminal measures and the current serving base station when communicating with the current serving base station.
  • a synchronization sequence of the same frequency, and the neighboring base station is found according to the synchronization sequence.
  • the terminal moves to the coverage area of the child base station, and when communicating with the current serving base station, the synchronization sequence of the child base station at the same frequency as the current serving base station can be measured.
  • the terminal measures the synchronization sequence, and determines the type of the neighboring base station according to the synchronization sequence. If the neighboring base station is found, the terminal according to the acquired information of the neighboring base station (The accessibility judgment is performed in advance, such as the secondary synchronization sequence or the cell identifier, and the scanning access is actively initiated to the neighboring base station. In this way, the terminal can avoid the periodic scanning of the neighboring base stations before the handover, so that the terminal discovers the neighboring base stations and actively accesses with little overhead, thereby improving the handover efficiency of the base station of the wireless communication system, and reducing the communication and the terminal. Overhead.
  • the step of the terminal measuring the synchronization sequence at the same frequency as the current serving base station includes obtaining the secondary synchronization sequence and/or the cell identification information.
  • the measurement synchronization sequence acquires cell identification information, that is, acquires a secondary synchronization sequence, and obtains cell identification information therefrom.
  • the terminal finds the neighboring base station according to the synchronization sequence, and the terminal judges according to the cell identification information. If the type of the base station is a small base station, it is considered that the adjacent base station is found.
  • the system can configure the mapping relationship between the base station type and the secondary synchronization sequence or the cell identifier to the terminal. Therefore, the terminal can determine the base station type according to the secondary synchronization sequence or the cell identification information.
  • the child base station includes an open child base station and a proprietary child base station, wherein the proprietary base station includes a completely proprietary child base station and a semi-proprietary child base station.
  • the terminal After discovering the neighboring base station, the terminal performs handover pre-processing to determine whether to perform the handover operation, and avoids attempting to switch to the proprietary base station that cannot be accessed.
  • the handover pre-processing refers to the terminal determining the accessibility of the neighboring base station, and performing corresponding processing according to the judgment result.
  • the foregoing handover pre-processing method is applicable not only to the case where the current serving base station of the terminal and the adjacent sub-base station are co-frequency, but also applicable to the case where the current serving base station of the terminal and the adjacent sub-base station are different frequency.
  • the terminal judges the accessibility of the neighboring base station according to the combination of any of the following information: the type of the base station, the signal quality of the current serving base station, whether the terminal tends to access the base station, white table information, whether there are other alternatives Base station.
  • the "terminal is inclined to access the child base station" can be configured when the terminal is initialized, or it can be a settable option. If the terminal is configured with white table information, it can be considered that the terminal tends to access the proprietary child base station.
  • the terminal determines that the neighboring base station is accessible, the terminal initiates scanning of the neighboring base station; if the terminal determines that the neighboring base station is inaccessible, the terminal maintains communication with the current serving base station or selects to switch to another base station.
  • one of the following situations establishes a terminal to determine that an adjacent child base station can access:
  • the neighboring base station type is an open child base station, and the terminal tends to access the child base station;
  • the neighboring base station is a proprietary type of base station, and the terminal has white table information;
  • the neighboring base station is a semi-proprietary child base station or an open child base station.
  • the signal quality of the current serving base station is lower than a predetermined threshold (i.e., the signal quality is poor), and there is no other candidate base station.
  • one of the following situations establishes a terminal to determine that a neighboring base station is inaccessible:
  • the neighboring base station is an open child base station, but the terminal does not tend to access the child base station, and the terminal
  • the communication quality with the serving base station is higher than the predetermined threshold (that is, the signal quality is good); the neighboring base station is an open child base station, but the terminal does not tend to access the child base station, and the signal quality of the terminal and the serving base station is lower than this.
  • Predetermined threshold poor signal quality
  • the terminal has other alternative base stations;
  • the neighboring base station is a completely proprietary base station, but the terminal does not have white table information;
  • the neighboring base station is a semi-proprietary base station, but the terminal does not have white table information. At this time, the signal quality of the terminal and the current serving base station is higher than a predetermined threshold (good signal quality);
  • the neighboring base station is a semi-proprietary child base station.
  • the signal quality of the current serving base station of the terminal is lower than a predetermined threshold (signal quality difference), but the terminal has other candidate base stations.
  • the other candidate base station may be a macro base station or a child base station. If it is a child base station, the handover pre-processing method may also be used to perform the pre-switching determination.
  • the signal quality threshold is the threshold of the parameter related to the signal quality. The threshold for the judgment of good or poor signal quality may be the same or different.
  • the terminal may first serve the current service before initiating the scanning of the neighboring base station or initiating the handover request to access the adjacent child base station.
  • the base station sends a neighboring cell request message, and obtains a neighboring cell list message that is sent by the serving base station and that contains the information of the proprietary cell site.
  • the neighbor list information can accelerate the scanning or switching of the neighbor to the neighboring area.
  • the step of the terminal initiating scanning and switching request access to the adjacent child base station includes:
  • Step 1 The terminal sends a scan request message to the current serving base station to request scanning of the neighboring base station.
  • Step 2 If the terminal receives the scan response message sent by the current serving base station, the terminal scans the neighboring base station to determine whether the neighboring base station is Suitable for access;
  • Step 3 If the neighboring base station is suitable for access, the terminal sends a handover request message to request to switch to the neighboring base station;
  • the handover request message sent by the terminal includes neighboring base station information, and the neighboring child base station is an adjacent child base station discovered by the terminal.
  • the serving base station After receiving the handover request of the terminal, the serving base station negotiates with the neighboring base station whether to allow access to the terminal and specific handover parameter information.
  • the serving base station sends a handover command message to the terminal, indicating whether the neighboring base station allows the location. Terminal access (eg, accept or reject);
  • the step of negotiating between the serving base station and the neighboring child base station includes: the serving base station sends a handover request message to the adjacent child base station; if the neighboring child base station is a proprietary child base station, the neighboring child base station according to the corresponding proprietary user group information Determining whether the terminal is allowed to access, and returning a response message to the serving base station, indicating whether the terminal is allowed to access; if the terminal is allowed to access, the neighboring base station may carry the parameter for the terminal to access in the returned response message. , sent to the terminal through the current serving base station.
  • the neighboring base station If the terminal is not a member of the private user group corresponding to the neighboring base station, or the adjacent semi-proprietary child base station does not access the non-member terminal to ensure the quality of service, the neighboring base station returns the denied terminal access to the serving base station. Response message.
  • Step 5 After receiving the handover command message that allows the handover, the terminal starts to re-enter the network to the neighboring base station.
  • the present invention will be further described by taking a WiMAX (Worldwide Interoperability for Microwave Access) communication network as an example with reference to the accompanying drawings.
  • the example 1-14 is applicable to the secondary base station discovery and handover pre-processing of the current serving base station and the adjacent child base station at the same frequency of the terminal.
  • the handover pre-processing method in the example 2-14 is also applicable to the case where the current serving base station of the terminal and the adjacent base station are different frequency.
  • Step 201 The terminal measures an intra-frequency synchronization sequence
  • the terminal After entering the network, the terminal can communicate with the serving base station while periodically measuring the synchronization sequence of the adjacent base stations of the same frequency. This intra-frequency measurement does not affect the communication with the serving base station, and the overhead to the terminal is extremely low.
  • Step 202 The terminal determines, according to the synchronization sequence of the neighboring base station, whether the base station type is a child base station, and if yes, the terminal discovers the neighboring base station, otherwise, the terminal ends.
  • the terminal pre-stores a mapping relationship between a base station type and a secondary synchronization sequence configured by the system, and/ Or, a mapping relationship between the base station type and the cell identifier, and determining a base station type according to the mapping relationship.
  • the terminal After the terminal enters the network, the terminal maintains communication with the serving base station while periodically measuring the synchronization sequence of the adjacent base stations of the same frequency. This same frequency measurement does not affect the communication with the serving base station, and the overhead to the terminal is extremely low.
  • the cell identifier is determined according to the standard default configuration and the mapping relationship between the base station type and the secondary synchronization sequence sent by the base station. If the type of the neighboring base station is determined to be a child base station, the terminal is considered to have discovered the adjacent child base station. In this method, the terminal can periodically discover the neighboring base station by scanning the neighboring base station, thereby improving the switching efficiency of the base station of the wireless communication system and reducing the communication and terminal overhead.
  • Step 301 The terminal discovers the neighboring base station
  • the method for the terminal to discover the neighboring base station can use the method shown in FIG. 2 or the existing technology.
  • Step 302 The terminal determines accessibility of the neighboring base station.
  • the terminal judges whether the neighboring base station is accessible according to several of the following information: the type of the base station, the signal quality of the current serving base station, whether the terminal tends to access the child base station, white table information, and whether there are other candidate base stations.
  • Step 303 The terminal performs subsequent processing according to the judgment result.
  • the terminal decides to initiate scanning for the neighboring base station according to the judgment result, or initiates scanning and handover request of the neighboring base station, or maintains communication with the current serving base station, or selects to switch to other base stations.
  • FIG. 4 is a flow chart of the terminal determining the accessibility of a neighboring base station. As shown in Figure 4, the following steps are included:
  • Step 401 The terminal determines whether the type of the neighboring base station is a completely proprietary base station, if If yes, go to step 404, otherwise go to step 402;
  • Step 402 the terminal determines whether the type of the neighboring base station is a semi-proprietary child base station, and if so, step 407 is performed, otherwise step 403 is performed;
  • Step 403 The terminal determines whether the type of the neighboring base station is an open child base station, and if yes, performs step 311, otherwise ends;
  • Step 404 the terminal determines whether there is white table information, and if so, step 405 is performed, otherwise step 406 is performed;
  • Step 405 The terminal initiates scanning of the neighboring base station, and ends.
  • Step 406 The terminal maintains communication with the current serving base station, and ends.
  • Step 407 the terminal determines whether there is white table information, and if so, step 405 is performed, otherwise step 408 is performed;
  • Step 408 determining whether the current serving base station quality is lower than a predetermined threshold (signal quality is poor), and if so, executing step 409, otherwise performing step 405;
  • Step 409 whether there are other alternative base stations, if yes, perform step 410, otherwise perform steps
  • Step 410 Determine accessibility of other candidate base stations.
  • Step 411 Determine whether the terminal tends to cut into the child base station. If yes, go to step 405. Otherwise, go to step 408.
  • the terminal After the terminal discovers the neighboring base station according to the method in the first embodiment, as shown in FIG. 3, the terminal performs the accessibility judgment of the neighboring base station. If the terminal determines that the terminal needs to access the child base station, the terminal initiates the scan access. Go to the neighboring base station, otherwise the terminal ignores the neighboring base station, maintains communication with the current serving base station, or selects other base stations for access.
  • the flow chart of the terminal determining the switching condition is as shown in FIG. 4.
  • the terminal sends according to the method described in Example 1. After the neighboring base station, the terminal judges the type of the adjacent base station. If the neighboring base station is an open child base station, the terminal further determines whether it prefers to access the child base station. If the terminal tends to access the child base station, the terminal decides to initiate scanning for the adjacent child base station, and scans with the serving base station. The interactive request of the message scans the adjacent child base station.
  • the terminal After the terminal discovers the adjacent child base station according to the method described in Embodiment 1, if the neighboring child base station is a completely proprietary child base station or a semi-proprietary child base station, the terminal further determines whether to maintain white table information, if the terminal has The white table information indicates that the terminal is a member of some specific user groups, and the terminal decides to initiate scanning for the adjacent child base station, and scans the neighboring child base station by performing an interaction request with the serving base station for scanning messages.
  • the terminal may send a neighbor request message to the serving base station, and obtain a neighbor list message of the current serving base station that is sent by the serving base station and includes the proprietary base station information, thereby facilitating scanning and Switching process.
  • the terminal After the terminal discovers the adjacent child base station according to the method described in Embodiment 1, if the neighboring child base station is a completely proprietary child base station, the terminal further determines whether there is white table information. If the terminal does not have white table information, the terminal does not indicate that the terminal does not If it belongs to any proprietary user group and therefore cannot access the proprietary Aberdeen base station, the terminal decides to maintain communication with the current serving base station.
  • the terminal After the terminal discovers the adjacent child base stations according to the method described in the example 1, if the neighboring child base station is an open child base station, the terminal does not tend to access the child base station. At this time, the signal of the serving base station detected by the terminal is getting worse and worse, and the condition of triggering handover of the system agreement has been reached, and the terminal determines whether other suitable accessible base stations can be found, and if other suitable accessible base stations can be found, Then the terminal may decide to scan other base stations, if the scanning succeeds in initiating the handover. If the terminal cannot find other suitable access base stations at this time, even if the terminal does not tend to access the child base station, the terminal still decides to initiate scanning of the current child base station to ensure the continuity of the communication service.
  • the terminal After the terminal discovers the adjacent child base stations according to the method described in the example 1, if the neighboring child base station is an open child base station, the terminal does not tend to access the child base station. At this time, the signal of the serving base station detected by the terminal is still very good, and the terminal ignores the neighboring base station and continues to maintain communication connection with the current serving base station.
  • the terminal After the terminal discovers the adjacent child base station according to the method described in the example 1, if the neighboring child base station is a semi-proprietary child base station, the terminal does not have white table information. At this time, the signal of the serving base station detected by the terminal is getting worse and worse, and the condition of triggering handover of the system agreement has been reached, and the terminal determines whether other suitable accessible base stations can be found, and if other suitable accessible base stations can be found, Then the terminal decides to scan other base stations, and if the scan succeeds, the handover is initiated. If the terminal cannot find other suitable accessible base stations at this time, even if the terminal is not a member of the semi-private user group, the terminal still decides to initiate scanning of the current child base station to ensure the continuity of the communication service.
  • the terminal After the terminal discovers the adjacent child base station according to the method described in the example 1, if the neighboring child base station is a semi-proprietary child base station, the terminal does not have white table information. At this time, the signal of the serving base station detected by the terminal is still good, and the terminal ignores the neighboring base station and continues to maintain a communication connection with the current serving base station.
  • FIG. 5 is a flowchart of a terminal sending a scan and a handover request to an adjacent base station, and specifically includes the following steps:
  • Step 501 The terminal sends scan request information to the current serving base station to request scanning of the neighboring base station.
  • the terminal may request different scan intervals according to the type of the neighboring base station.
  • Step 502 The current serving base station sends a scan response message to the terminal.
  • Step 503 The terminal enters the neighboring base station in a given scanning interval according to the scan response message. Line scan
  • Step 504 the terminal determines, according to the scan result, whether the neighboring base station is suitable for access, and if yes, proceeds to step 505, otherwise proceeds to step 510;
  • Step 505 The terminal sends a handover request message to the current serving base station, requesting to switch to the adjacent abutting base station;
  • the handover request message sent by the terminal includes neighboring base station information, and the neighboring base station is an adjacent child base station discovered by the terminal.
  • Step 506 After receiving the handover request message of the terminal, the current serving base station negotiates with the neighboring base station whether to allow the terminal to access, and if the access is allowed, the neighboring base station specifically switches the parameter information.
  • Step 507 The terminal receives a handover command message.
  • Step 508 the terminal determines whether the neighboring base station can be accessed according to the handover command message, if yes, proceeds to step 509, otherwise proceeds to step 511;
  • Step 509 The terminal sends a handover indication message to the serving base station.
  • Step 510 The terminal starts to re-enter the network to the neighboring base station, and the process ends.
  • Step 511 The terminal gives up access to the neighboring base station, and the process ends.
  • FIG. 6 is a flowchart of determining whether a neighboring base station is suitable for access according to a scan result. For a proprietary neighboring base station, if the terminal acquires a unique neighboring base station identifier information and/or special The information about the proprietary user group corresponding to the neighboring base station, and the terminal determining whether to access the proprietary neighboring base station according to the white table includes the following steps:
  • Step 601 the terminal determines whether the signal strength of the neighboring base station is suitable for access, and if yes, proceeds to step 602, otherwise proceeds to step 608;
  • the signal strength information such as the signal-to-noise ratio (CINR) and the received signal strength indicator (RSSI) of the neighboring base station signals acquired during the scanning is used to determine whether the neighboring base station is suitable for access from the signal strength angle.
  • CINR signal-to-noise ratio
  • RSSI received signal strength indicator
  • Step 602 the terminal determines whether the adjacent child base station is a proprietary child base station, if yes, proceeds to step 603, otherwise proceeds to step 607;
  • Step 604 the terminal determines whether there is a matching base station identifier in the white table, and if yes, proceeds to step 607, otherwise proceeds to step 605;
  • Step 605 The terminal acquires the proprietary user group information sent by the neighboring base station.
  • Step 606 the terminal determines whether there is a matching private user group information in the white table, if yes, proceeds to step 607, otherwise proceeds to step 608;
  • Step 607 The terminal considers that the neighboring base station is suitable for accessing
  • Step 608 The terminal considers that the neighboring base station is not suitable for access.
  • the terminal After discovering the neighboring child base stations according to the method described in Embodiment 1, the terminal continues to determine that the terminal needs to access the adjacent child base station according to the method described in Embodiments 2, 3, and 5. As shown in FIG. 5, the terminal sends a scan request message to the serving base station to request scanning of the neighboring base station, wherein the scan request message may request different scanning intervals according to the type of the child base station, for example, the proprietary base station may request a longer interval. To obtain proprietary user group information, an open child base station can request a relatively short scan interval. After receiving the scan request message sent by the terminal, the serving base station replies to the terminal with a scan response message. After receiving the scan response message sent by the service base station, the terminal scans the adjacent base station within the agreed scan interval. If the terminal finds that it is not suitable for access according to the signal strength of the neighboring base station during scanning, as shown in FIG. 6, the terminal considers that the neighboring base station is not suitable for access, thereby giving up access to the neighboring base station.
  • the terminal After the terminal discovers the adjacent child base stations according to the method described in the example 1, the terminal continues to determine that the terminal needs to access the adjacent child base station according to the methods described in the examples 2, 3 and 5. As shown in FIG. 5, the terminal sends a scan request message to the serving base station to request scanning of the neighboring base station, wherein the scan request message may request different scanning intervals according to the type of the child base station, for example, the proprietary base station may request a longer interval. To obtain proprietary user group information, an open child base station can request a relatively short scan interval. After receiving the scan request message sent by the terminal, the serving base station returns a scan response message to the terminal. After receiving the scan response message sent by the serving base station, the terminal scans the neighboring base station within the agreed scan interval.
  • the terminal detects the signal strength of the neighboring base station during scanning, it finds that it is suitable for access. As shown in FIG. 6, the terminal determines whether the neighboring base station is a proprietary child base station. If it is not a proprietary child base station, the terminal considers the phase.
  • the neighboring base station is suitable for access and sends a handover request message to the serving base station. After receiving the handover request message sent by the terminal, the serving base station sends a handover request message to the adjacent target child base station.
  • the neighboring target base station sends a handover response message to the serving base station to inform whether the terminal is allowed to access.
  • the serving base station sends a handover command message to the terminal according to the handover response message sent by the neighboring target base station.
  • the terminal After receiving the handover command message, the terminal determines whether the neighboring base station can be accessed according to the handover command message. If the terminal can access, the terminal sends the handover indication information to the serving base station, and starts network re-entry to the adjacent base station. If the handover command message informs the terminal that it is not allowed to access, the terminal gives up access to the neighboring base station.
  • the terminal After the terminal discovers the adjacent child base stations according to the method described in the example 1, the terminal continues to determine that the terminal needs to access the adjacent child base station according to the methods described in the examples 2, 3 and 5. As shown in FIG. 5, the terminal sends a scan request message to the serving base station to request scanning of the neighboring base station, wherein the scan request message may request different scanning intervals according to the type of the child base station, for example, the proprietary base station may request a longer interval. To obtain proprietary user group information, an open child base station can request a relatively short scan interval. After receiving the scan request message sent by the terminal, the serving base station returns a scan response message to the terminal. After receiving the scan response message sent by the serving base station, the terminal scans the neighboring base station within the agreed scan interval.
  • the terminal determines whether the neighboring base station is a proprietary child base station, and if it is a proprietary child base station, the terminal scans. Further obtaining identifier information of the neighboring base station and determining whether there is matching base station identifier information in the white list. If there is matching neighboring base station identifier information in the white list, the terminal considers that the neighboring base station is suitable for access, and sends a handover request message to the serving base station. After receiving the handover request message sent by the terminal, the serving base station sends a handover request message to the adjacent target child base station.
  • the neighboring target base station sends a handover response message to the serving base station to inform whether the terminal is allowed to access.
  • the serving base station sends a handover command message to the terminal according to the handover response message sent by the neighboring target base station.
  • the terminal determines whether the neighboring base station can be accessed according to the handover command message. If the terminal can access, the terminal sends the handover indication information to the serving base station, and starts to re-enter the network to the neighboring child.
  • the base station if the handover command message informs the terminal that it is not allowed to access, the terminal relinquishes access to the adjacent child base station.
  • the terminal After discovering the neighboring base stations according to the method described in Embodiment 1, the terminal continues according to the examples 2, 3,
  • the method described in 5 determines that the terminal needs to access an adjacent child base station.
  • the terminal sends a scan request message to the serving base station to request scanning of the neighboring base station, wherein the scan request message may request different scanning intervals according to the type of the child base station, for example, the proprietary base station may request a longer interval.
  • an open child base station can request a relatively short scan interval.
  • the serving base station replies to the terminal with a scan response message.
  • the terminal scans the adjacent base station within the agreed scan interval. If the terminal detects the signal strength of the neighboring base station during scanning, and finds that it is suitable for access, as shown in FIG.
  • the terminal determines whether the neighboring base station is a proprietary child base station, and if it is a proprietary child base station, the terminal scans. Further obtaining identifier information of the neighboring base station and determining whether there is matching base station identifier information in the white list. If there is no matching neighboring base station identifier information in the white table, the terminal further acquires the proprietary user group information sent by the neighboring base station, and determines whether there is matching private user group information in the white table. If the terminal has matching private user group information in the white table, the terminal considers that the neighboring base station is suitable for access, and sends a handover request message to the serving base station.
  • the serving base station After receiving the handover request message sent by the terminal, the serving base station sends a handover request message to the neighboring target child base station.
  • the neighboring target base station sends a handover response message to the serving base station to inform whether the terminal is allowed to access.
  • the serving base station sends a handover command message to the terminal according to the handover response message sent by the neighboring target base station.
  • the terminal After receiving the handover command message, the terminal determines whether the neighboring base station can be accessed according to the handover command message. If the terminal can access, the terminal sends the handover indication information to the serving base station, and starts network re-entry to the adjacent base station. If the handover command message informs the terminal that it is not allowed to access, the terminal gives up access to the neighboring base station.
  • the terminal After the terminal discovers the adjacent child base stations according to the method described in the example 1, the terminal continues to determine that the terminal needs to access the adjacent child base station according to the methods described in the examples 2, 3 and 5. As shown in Figure 5, the terminal sends a sweep The request message is sent to the serving base station to request scanning of the neighboring base station, wherein the scan request message may request different scanning intervals according to the type of the child base station, for example, the proprietary base station may request a longer interval to obtain the exclusive user group information. An open child base station can request a relatively short scan interval.
  • the serving base station After receiving the scan request message sent by the terminal, the serving base station returns a scan response message to the terminal. After receiving the scan response message sent by the serving base station, the terminal scans the neighboring base station within the agreed scan interval.
  • the terminal determines whether the neighboring base station is a proprietary child base station, and if it is a proprietary child base station, the terminal scans. Further obtaining identifier information of the neighboring base station and determining whether there is matching base station identifier information in the white list. If there is no matching neighboring base station identifier information in the white table, the terminal further acquires the proprietary user group information sent by the neighboring base station, and determines whether there is matching private user group information in the white table. If the terminal does not have matching private user group information in the white table, the terminal considers that the neighboring child base station is not suitable for access, and the terminal gives up access to the adjacent child base station.
  • FIG. 7 is a flow chart of the serving base station determining whether to allow the terminal to switch to the adjacent proprietary base station, and specifically includes the following steps:
  • Step 701 The serving base station receives a handover request message sent by the terminal.
  • the handover request message carries information about the terminal.
  • Step 702 The serving base station sends a handover request message to the target child base station.
  • Step 703 The target child station determines, according to the received handover request message, whether the terminal that requests the access is a member of the corresponding private user group, and if yes, proceeds to step 705, otherwise proceeds to step 704; if the neighboring base station is proprietary The neighboring base station determines whether to allow the terminal to access according to the corresponding private user group information, and returns a response message to the serving base station to indicate whether the terminal is allowed to access; if the terminal is allowed to access, The terminal is a member of the private user group, and the neighboring base station may carry the parameter for the terminal access in the returned response message, and send the parameter to the terminal through the current serving base station; if the terminal is not a member of the exclusive user group corresponding to the neighboring base station And the neighboring base station returns a response message rejecting the terminal access to the serving base station;
  • the neighboring base station is a semi-proprietary child base station
  • the terminal is in the private user group of the semi-proprietary child base station, the same base station is processed; if the terminal is not in the private user group of the child base station,
  • the semi-proprietary child base station can determine whether to allow the terminal to access according to its own principle. For example, the terminal accessed by the semi-proprietary child base station has reached a certain number, and the semi-proprietary child base station no longer accesses the quality of service. For a non-member terminal, the neighboring semi-proprietary base station returns a response message rejecting the terminal access to the current serving base station of the terminal.
  • Step 704 The target eNB sends a handover response message to accept the handover request, and performs step 706.
  • Step 707 The serving base station sends a corresponding handover command message to the terminal, indicating whether the neighboring base station allows the terminal to access (allow or reject).
  • the terminal After discovering the adjacent child base stations according to the method described in the example 1, the terminal continues to determine that the terminal needs to access the adjacent child base station according to the method described in the examples 2, 3, and 5.
  • the terminal sends a scan request message to the serving base station to request to scan the adjacent child base station, wherein the scan request message may request different scan intervals according to the type of the child base station, for example, the proprietary base station may request a longer interval to obtain a proprietary user group. Information, while an open child base station can request a relatively short scan interval.
  • the serving base station After receiving the scan request message sent by the terminal, the serving base station returns a scan response message to the terminal. After receiving the scan response message sent by the serving base station, the terminal scans the neighboring base station within the agreed scan interval.
  • the terminal detects that the signal strength of the neighboring base station is suitable for access during scanning, the terminal considers that the neighboring base station is suitable for access, and sends a handover request message to the serving base station. After receiving the handover request message sent by the terminal, the serving base station sends a handover request message to the adjacent target child base station. If the neighboring target child base station is a proprietary child base station, as shown in FIG. 7, the target child base station determines, according to the handover request information sent by the serving base station, whether the terminal is a member of its corresponding proprietary user group, and if so, the target child base station.
  • the handover response message is sent to the serving base station to inform the terminal to allow access, otherwise the target child base station sends a handover response message to the serving base station to inform it that the terminal access is denied.
  • the serving base station sends a handover command message to the terminal according to the handover response message sent by the neighboring target base station.
  • the terminal determines whether the neighboring base station can be accessed according to the handover command message. If the terminal can access, the terminal sends the handover indication information to the serving base station, and starts network re-entry to the adjacent base station. ; if switching command message If the terminal is informed that it is not allowed to access, the terminal gives up access to the neighboring base station.
  • a terminal for discovering a neighboring base station comprising a measurement module, a determining module, wherein: the measuring module is configured to: when the terminal communicates with a current serving base station, measure a synchronization sequence with a current serving base station;
  • the determining module finds whether there is an adjacent child base station according to the synchronization sequence.
  • the terminal further includes a handover pre-processing module, configured to determine connectivity of the neighboring base station, and invoke a corresponding module to perform processing according to the determination result.
  • a handover pre-processing module configured to determine connectivity of the neighboring base station, and invoke a corresponding module to perform processing according to the determination result.
  • the corresponding module includes: a scanning module and a switching module, respectively, for performing scanning on adjacent abutting base stations, and initiating switching.
  • the terminal that implements the handover pre-processing includes a judging module and a handover pre-processing module, where: the judging module is configured to determine whether the neighboring base station is a child base station, if the handover pre-processing module is invoked;
  • the switching pre-processing module is configured to determine the accessibility of the neighboring base station, and call the corresponding module to perform processing according to the judgment result.
  • the judging module judges whether the neighboring base station is a child base station, and can adopt the method of the present invention, and can also adopt the method of the prior art.
  • the method of the present invention measures the synchronization sequence of the neighboring base stations of the same frequency by the terminal, and determines the type of the neighboring base station according to the synchronization sequence. If the presence of the child base station is found, the terminal actively initiates the scanning and the handover request to access the child base station. In this way, the terminal can avoid the periodic scanning of the neighboring base stations before the handover, so that the terminal discovers the neighboring base stations and actively accesses with little overhead, thereby improving the handover efficiency of the base station of the wireless communication system, and reducing the communication and the terminal. Overhead.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明公开了一种无线通信系统中仔基站发现方法、切换预处理方法及终端,节约终端的处理开销,避免终端尝试切换到无法接入的仔基站。所述仔基站发现方法包括:终端在与当前服务基站通信时,测量与当前服务基站同频的同步序列,根据所述同步序列发现是否有相邻仔基站。所述仔基站切换预处理方法包括:终端在发现相邻仔基站后进行切换预处理,判断所述相邻仔基站的可接入性,并根据判断结果进行相应处理。

Description

无线通信系统中仔基站发现方法、 切换预处理方法及终端
技术领域
本发明涉及无线通信技术领域, 具体涉及一种无线通信系统中仔基站发 现和切换预处理方法, 以及终端。
背景技术
无线通信系统中, 基站是指给终端提供服务的设备, 基站与终端之间通 过电磁波进行无线通信。 无线通信系统通过基站可以为一定地理范围的终端 提供无线覆盖, 这个地理范围称为小区。
通常, 无线通信系统为了能够大范围的为用户提供无线通信, 需要部署 覆盖范围大的基站。 这种基站通常称为宏基站(Macro BS ) , 其覆盖的小区 通常称为宏小区(Macro Cell ) ,—个宏基站最大可覆盖方圓 2-3公里的区域。 同时, 无线通信系统考虑到用户不同的需求以及使用环境, 会部署一些覆盖 范围小、 发射功率较低的基站, 从而为用户在某些特定环境或者场景下提供 更高质量的无线通信服务。 这些小型基站包括微基站(Micro BS ) 、 微微基 站(Pico BS ) 、 和仔基站(Femto BS, 也称为家庭基站或个人基站) 。
由于宏基站和仔基站覆盖范围差别巨大, 在宏基站的覆盖范围内可能部 署有大量(几百甚至上千) 的仔基站以改善室内的通信服务质量。 图 1为现 有由宏基站构成的含有仔基站的无线通信系统的组成结构示意图。 用户入网 类型的不同提供了不同的仔基站划分策略, 通常分为开放的仔基站和专有的 仔基站两种。 在不超过最大用户数的前提下, 开放的仔基站允许任何用户接 入。 专有的仔基站又包括完全专有的仔基站和半专有的仔基站。 完全专有的 仔基站只对专有的用户开放, 而半专有的仔基站在能保证专有用户服务质量 的前提下允许接入其他非专有用户。
为了保证服务连续性以及服务质量, 终端在移动过程中往往需要在基站 之间进行切换。 如图 1所示, 当终端 B从宏基站 A的覆盖区域移动到宏基站 B的覆盖区域时, 终端需要从宏基站 A切换到宏基站 B; 而当终端 A从宏基 站 A的覆盖区域移动到仔基站 A的覆盖区域时, 为实现有效地资源利用, 终 端可以从宏基站 A切换到仔基站 A以减轻宏基站 A的负载。切换一般首先由 服务基站发送相邻基站的系统参数信息, 终端对相邻基站进行测量然后根据 切换门限及测量结果判断是否需要切换, 如需切换, 终端和服务基站以及目 标基站之间通过消息完成切换参数的交互, 最后终端与目标基站进行同步, 恢复数据传输。
在一个由宏基站和仔基站构成的无线通信系统中, 由于宏基站覆盖范围 内会部署大量的仔基站, 为节省空口开销, 现有系统中服务基站广播发送邻 区列表(NBR-ADV )消息时仅发送与服务基站相邻的宏基站和开放的仔基站 信息,专有的仔基站信息只有在服务基站接收到终端的邻区请求(NBR-REQ ) 消息时发送或是由服务基站主动单播发送。 因此, 当终端移动到专有的仔基 站的覆盖区域时, 只有通过盲扫或根据白表信息或位置信息扫描发现专有仔 基站。 这些方法大都需要终端周期性的对相邻基站发起扫描才能发现专有仔 基站的存在, 因此消耗大量的时间和终端处理开销。 位置信息虽然可以在一 定程度上避免终端频繁的扫描相邻基站, 但它需要 LBS ( Location Based Services, 地理位置服务)的支持, 从而引起额外的上报开销。 此外由于仔基 站分为专有的和开放的接入类型, 终端在发起扫描之前如果不能提前判断能 否接入该仔基站, 则可能造成终端尝试切换到无法接入的专有仔基站, 从而 导致时间和资源的浪费。
发明内容
本发明要解决的技术问题是提供一种无线通信系统中仔基站发现方法、 切换预处理方法及终端, 节约终端的处理开销, 避免终端尝试切换到无法接 入的仔基站。 为解决上述技术问题, 本发明提供了一种无线通信系统中仔基站发现方 法, 包括: 终端在与当前服务基站通信时, 测量与当前服务基站同频的同步 序列, 根据所述同步序列发现是否有相邻仔基站。
所述终端测量与当前服务基站同频的同步序列的步骤包括: 获取辅同步 序列和 /或小区标识信息。 所述根据同步序列发现是否有相邻仔基站的步骤包括: 终端根据辅同步 序列和 /或小区标识信息判断基站类型, 如果基站类型为仔基站, 则所述终端 发现存在相邻仔基站。
所述终端预先保存有系统配置的基站类型与辅同步序列或小区标识的映 射关系, 根据所述映射关系判断基站类型。
上述方法还包括: 终端在发现相邻仔基站后进行切换预处理, 判断相邻 仔基站的可接入性, 并根据判断结果进行相应处理。
在所述终端判断相邻仔基站的可接入性的步骤中, 终端根据以下信息中 的任意一种或多种的组合判断相邻仔基站的可接入性: 仔基站类型、 当前服 务基站信号质量、 终端是否倾向于接入仔基站、 白表信息、 是否有其他备选 基站。
根据判断结果进行相应处理的步骤包括: 如果终端判断相邻仔基站可接 入, 则终端发起对相邻仔基站的扫描; 如果终端判断相邻仔基站不可接入, 则终端维持与当前服务基站的通信或选择切换到其他基站。
为解决上述技术问题, 本发明还提供了一种无线通信系统中仔基站切换 预处理方法, 包括: 终端在发现相邻仔基站后进行切换预处理, 判断所述相 邻仔基站的可接入性, 并根据判断结果进行相应处理。
在所述终端判断所述相邻仔基站的可接入性的步骤中, 终端根据以下信 息中的任意一种或多种的组合判断相邻仔基站的可接入性: 仔基站类型、 当 前服务基站信号质量、 终端是否倾向于接入仔基站、 白表信息、 是否有其他 备选基站。
在所述终端判断所述相邻仔基站的可接入性的步骤中, 下述情况之一成 立, 终端判断所述相邻仔基站可接入: 相邻仔基站类型是开放的仔基站, 且 终端倾向于接入仔基站; 相邻仔基站是专有的仔基站类型, 且终端有白表信 息; 相邻基站是半专有仔基站或开放仔基站, 当前服务基站的信号质量差, 且没有其他备选基站; 下述情况之一成立, 终端判断所述相邻仔基站不可接 入: 相邻仔基站是开放的仔基站, 但终端不倾向于接入仔基站, 并且终端此 时与服务基站的通信质量良好; 相邻仔基站是开放的仔基站, 但终端不倾向 于接入仔基站, 并且终端此时与服务基站的信号质量差, 但终端有其他备选 基站; 相邻仔基站是完全专有的仔基站, 但终端没有白表信息; 相邻仔基站 是半专有的仔基站, 但终端没有白表信息, 此时终端当前服务基站的通信质 量良好; 相邻仔基站是半专有的仔基站, 此时终端当前服务基站服务质量差, 但是终端有其他备选基站。
所述终端根据判断结果进行相应处理的步骤包括: 如果终端判断相邻仔 基站可接入, 则终端发起对相邻仔基站的扫描; 如果终端判断相邻仔基站不 可接入, 则终端维持与当前服务基站的通信或选择切换到其他基站。
如果终端判断相邻仔基站可接入, 且该相邻仔基站为专有仔基站, 终端 在发起相邻仔基站的扫描或发起切换请求接入到相邻仔基站之前, 所述方法 还包括: 向当前服务基站发送邻区请求消息, 获取服务基站单播发送的包含 该专有仔基站信息的邻区列表消息。
所述终端发起对相邻仔基站的扫描的步骤包括: 步骤 1 , 终端向当前服 务基站发送扫描请求消息请求扫描相邻仔基站; 步骤 2, 终端根据收到的当 前服务基站发送的扫描响应消息, 对相邻仔基站进行扫描, 并判断相邻仔基 站是否适合接入, 如果适合接入, 终端发起切换。
在所述步骤 1中, 终端根据相邻仔基站的类型请求不同的扫描间隔。 所述终端发起切换的步骤包括: 步骤 a, 终端发送切换请求消息请求切 换到相邻仔基站; 步骤 b, 所述终端接收到所述相邻仔基站的切换命令消息 后, 进行网络重入到相邻仔基站。
在所述步骤 a中, 所述终端发送的切换请求消息中包括所述相邻仔基站 信息。
在所述步骤 a中, 所述终端发送切换请求消息到当前服务基站请求切换 到相邻仔基站;
在所述步骤 b之前, 所述终端发起切换的步骤还包括: 所述当前服务基 站接收到终端的切换请求后, 与相邻仔基站协商是否允许所述终端接入; 所 述当前服务基站发送切换命令消息给终端, 指示终端相邻仔基站是否允许其 接入。
所述服务基站与相邻仔基站协商是否允许所述终端接入的步骤包括: 服 务基站发送切换请求消息给相邻仔基站; 所述相邻仔基站如果是专有的仔基 站, 根据对应的专有用户组信息和 /或基站标识信息判断是否允许所述终端接 入; 所述相邻仔基站向服务基站返回切换响应消息。
为解决上述技术问题, 本发明还提供了一种发现相邻仔基站的终端, 包 括测量模块和判断模块, 其中:
所述测量模块设置为: 在所述终端与当前服务基站通信时, 测量与当前 服务基站同频的同步序列;
所述判断模块设置为: 根据所述同步序列发现是否有相邻仔基站。
所述终端还包括切换预处理模块, 其设置为: 判断相邻仔基站的可接入 性, 并根据判断结果调用相应的模块进行处理。
为解决上述技术问题, 本发明还提供了一种实现切换预处理的终端, 包 括判断模块和切换预处理模块, 其中:
所述判断模块设置为: 判断相邻基站是否为仔基站, 如果是调用所述切 换预处理模块;
所述切换预处理模块设置为: 判断相邻仔基站的可接入性, 并根据判断 结果调用相应的模块进行处理。
本发明方法通过终端对同频的相邻仔基站的同步序列进行测量, 根据同 步序列判断相邻基站的类型, 如果发现有仔基站的存在, 终端主动发起扫描 和切换请求接入到仔基站, 这种方式可以在切换之前避免终端周期性的对相 邻基站的扫描, 使终端以很少的开销的发现相邻仔基站并主动接入, 从而改 善无线通信系统基站切换效率, 降低通信和终端开销。 附图概述
图 1是本发明的背景无线通信系统基站切换示意图;
图 2是终端通过测量同频的同步序列发现相邻仔基站的流程图; 图 3是终端发现相邻仔基站后判断相邻仔基站可接入性的流程图; 图 4是终端判断基站可接入性的流程图;
图 5是终端发送扫描和切换请求接入到相邻仔基站的流程图;
图 6是终端根据扫描结果判断相邻仔基站是否适合接入的流程图; 图 7是服务基站判断是否允许终端切换到相邻专有仔基站的流程图。
本发明的较佳实施方式
由于终端对与当前服务基站同频的同步序列进行测量时, 并不影响与服 务基站的通信, 基于这种现象, 本发明的发明构思是, 终端在与当前服务基 站通信时测量与当前服务基站同频的同步序列, 根据所述同步序列发现相邻 仔基站。
通常终端移动到仔基站覆盖区域内, 且与当前服务基站通信时可以测量 到与当前服务基站同频的仔基站的同步序列。
在宏基站和仔基站同频的情况下, 终端对同步序列进行测量, 根据同步 序列判断相邻基站的类型, 如果发现存在相邻仔基站, 则终端根据获取到的 相邻仔基站的信息 (如辅同步序列或小区标识符)提前进行可接入性判断, 并主动发起扫描接入到该相邻仔基站。 这种方式可以在切换之前避免终端周 期性的对相邻基站的扫描, 使终端以很少的开销的发现相邻仔基站并主动接 入, 从而改善无线通信系统基站切换效率, 降低通信和终端开销。
终端测量与当前服务基站同频的同步序列的步骤包括, 获取辅同步序列 和 /或小区标识信息。 具体包括, 测量同步序列获取小区标识信息, 即获取辅 同步序列, 从中获取小区标识信息。
终端根据所述同步序列发现相邻仔基站是指, 终端根据小区标识信息判 断基站类型, 如果基站类型为仔基站, 则认为发现了相邻仔基站。 由于系统 预先将基站类型与辅同步序列或小区标识的映射关系配置给终端, 因此终端 可根据辅同步序列或小区标识信息判断基站类型。 所述仔基站包括开放的仔 基站和专有的仔基站, 其中, 专有的基站包括完全专有的仔基站和半专有的 仔基站。
终端在发现相邻仔基站后进行切换预处理, 决定是否进行切换操作, 避 免尝试切换到无法接入的专有仔基站。
所述切换预处理是指终端判断相邻仔基站的可接入性, 并根据判断结果 进行相应处理。 上述切换预处理方法不仅适用于终端的当前服务基站和相邻 仔基站同频的情况,也适用于终端的当前服务基站和相邻仔基站异频的情况。
终端根据以下信息中的任意几种的组合判断相邻仔基站的可接入性: 仔 基站类型、 当前服务基站信号质量、 终端是否倾向于接入仔基站、 白表信息、 是否有其他备选基站。 其中 "终端是否倾向于接入仔基站" 可以在终端初始 化时配置, 也可以是一个可设置的选项, 如果终端配置有白表信息, 则可认 为该终端倾向于接入专有仔基站。
根据判断结果进行相应处理包括:
如果终端判断相邻仔基站可接入, 则终端发起相邻仔基站的扫描; 如果终端判断相邻仔基站不可接入, 则终端维持与当前服务基站的通信 或选择切换到其他基站。
例如, 下述情况之一成立终端判断某一相邻仔基站可接入:
相邻仔基站类型是开放的仔基站, 且终端倾向于接入仔基站;
相邻仔基站是专有的仔基站类型, 且终端有白表信息;
相邻基站是半专有仔基站或开放仔基站, 当前服务基站的信号质量低于 预定门限(即信号质量差) , 且没有其他备选基站。
例如, 下述情况之一成立终端判断某一相邻仔基站不可接入:
相邻仔基站是开放的仔基站, 但终端不倾向于接入仔基站, 并且终端此 时与服务基站的通信质量高于预定门限(即信号质量良好) ; 相邻仔基站是开放的仔基站, 但终端不倾向于接入仔基站, 并且终端此 时与服务基站的信号质量低于预定门限(信号质量差) , 但终端有其他备选 基站;
相邻仔基站是完全专有的仔基站, 但终端没有白表信息;
相邻仔基站是半专有的仔基站, 但终端没有白表信息, 此时终端与当前 服务基站的信号质量高于预定门限(信号质量好) ;
相邻仔基站是半专有的仔基站, 此时终端当前服务基站的信号质量低于 预定门限(信号质量差) , 但终端有其他备选基站。
上述其他备选基站可以是宏基站或是仔基站, 如果是仔基站, 则也可釆 用上述切换预处理方法进行切换前的判断。 信号质量门限是指与信号质量有关的参数的阔值, 对于信号质量良好或 差的判断的阔值可以相同也可以不同。
如果终端判断相邻仔基站为专有仔基站, 且该相邻仔基站可接入, 终端 在发起相邻仔基站的扫描或发起切换请求接入到相邻仔基站之前, 可先向当 前服务基站发送邻区请求消息, 获取服务基站单播发送的含有该专有仔基站 信息的邻区列表消息。 该邻区列表信息可以加速终端对邻区的扫描或切换。
所述终端发起扫描和切换请求接入到相邻仔基站的步骤包括:
步骤 1 , 终端向当前服务基站发送扫描请求消息请求扫描相邻仔基站; 步骤 2 , 如果终端收到当前服务基站发送的扫描响应消息, 终端对相邻 仔基站进行扫描, 判断相邻仔基站是否适合接入;
步骤 3 , 如果相邻仔基站适合接入, 终端发送切换请求消息请求切换到 相邻仔基站;
优选地, 终端发送的切换请求消息中包括相邻仔基站信息, 该相邻仔基 站是终端发现了的相邻仔基站。 步骤 4 , 接收到终端的切换请求后, 服务基站与相邻仔基站协商是否允 许接入所述终端以及具体的切换参数信息; 服务基站发送切换命令消息给终 端, 指示相邻仔基站是否允许所述终端接入(例如, 接受或拒绝) ;
所述服务基站与相邻仔基站协商的步骤包括: 服务基站发送切换请求消 息给相邻仔基站; 如果相邻仔基站是专有的仔基站, 相邻仔基站根据对应的 专有用户组信息判断是否允许所述终端接入, 向服务基站返回响应消息, 指 示其是否允许所述终端接入; 如果允许终端接入, 相邻仔基站可在返回的响 应消息中携带供终端接入的参数, 通过当前服务基站发送给终端。 如果终端 不是相邻仔基站对应的专有用户组的成员, 或者相邻半专有仔基站为保证服 务质量不再接入非成员终端, 则相邻仔基站向服务基站返回拒绝终端接入的 响应消息。
步骤 5 , 终端接收到允许切换的切换命令消息后, 开始网络重入到相邻 仔基站。
结合附图 , 以 WiMAX ( Worldwide Interoperability for Microwave Access, 全球微波互联接入)通信网络为例对本发明进行进一步说明。 实例 1-14适用 于终端的当前服务基站和相邻的仔基站同频情况下的仔基站发现和切换预处 理。 而实例 2-14中切换预处理方法同样适用于终端的当前服务基站和相邻的 仔基站异频的情况。
图 2是终端通过测量同频的同步序列发现相邻仔基站的流程图, 如图 2 所示, 具体包括以下步骤: 步骤 201 , 终端测量同频同步序列;
入网后, 终端可一边和服务基站保持通信, 一边周期性的测量同频的相 邻基站的同步序列。 这种同频测量并不影响与服务基站的通信, 而且给终端 带来的开销极低。
步骤 202 , 终端根据相邻基站的同步序列判断基站类型是否为仔基站, 如果是, 终端发现相邻仔基站, 否则, 结束。
所述终端预先保存有系统配置的基站类型与辅同步序列映射关系, 和 / 或, 基站类型与小区标识的映射关系, 根据所述映射关系判断基站类型。
实例 1
终端入网后, 终端一边和服务基站保持通信, 一边周期性的测量同频的 相邻基站的同步序列。 这种同频测量并不影响与服务基站的通信, 而且给终 端带来的开销极低。 如图 2所示, 当终端测量到与服务基站不同的辅同步序 列或小区标识符时, 根据标准缺省配置以及基站发送的的基站类型与辅同步 序列的映射关系, 由小区标识符判断相邻基站的类型, 如果判断基站类型为 仔基站, 则认为终端发现了相邻的仔基站。 这种方法无需终端周期性的对相 邻基站发起扫描就能发现相邻仔基站的存在, 从而改善无线通信系统基站切 换效率, 降低通信和终端开销。
终端判断是否切换到相邻仔基站的流程如图 3所示, 具体包括: 步骤 301 , 终端发现相邻仔基站;
终端发现相邻仔基站的方法可以釆用如图 2所示的方法, 也可以釆用现 有技术的方法。
步骤 302, 终端判断相邻仔基站的可接入性;
终端根据以下信息中的几种判断相邻仔基站是否可接入: 基站类型、 当 前服务基站信号质量、 终端是否倾向于接入仔基站、 白表信息、 是否有其他 备选基站。
步骤 303 , 终端根据判断结果进行后续处理。
终端根据判断结果决定发起对相邻仔基站的扫描, 或发起相邻仔基站的 扫描和切换请求, 或维持与当前服务基站的通信, 或选择切换到其他基站。
图 4是终端判断某相邻仔基站可接入性的流程图。 如图 4所示, 具体包 括以下步骤:
步骤 401 , 终端判断该相邻仔基站的类型是否为完全专有仔基站, 如果 是, 执行步骤 404, 否则执行步骤 402;
步骤 402, 终端判断该相邻仔基站的类型是否为半专有仔基站, 如果是, 执行步骤 407 , 否则执行步骤 403;
步骤 403 , 终端判断该相邻仔基站的类型是否为开放仔基站, 如果是, 执行步骤 311 , 否则结束;
上述步骤 401、 步骤 402、 步骤 403的执行不分先后。
步骤 404, 终端判断是否有白表信息, 如果是, 执行步骤 405 , 否则执行 步骤 406;
步骤 405 , 终端发起对相邻仔基站的扫描, 结束;
步骤 406, 终端维持与当前服务基站的通信, 结束;
步骤 407 , 终端判断是否有白表信息, 如果是, 执行步骤 405 , 否则执行 步骤 408;
步骤 408 , 判断当前服务基站质量是否低于预定门限(信号质量差) , 如果是, 执行步骤 409, 否则执行步骤 405;
步骤 409, 是否有其他备选基站, 如果是, 执行步骤 410, 否则执行步骤
405;
步骤 410, 判断其他备选基站的可接入性;
其他备选基站如果是仔基站,也可按照本流程判断该仔基站的可接入性。 步骤 411 , 判断终端是否倾向于切入仔基站, 如果是, 执行步骤 405 , 否 则, 执行步骤 408。
实例 2
终端根据实例 1所述的方法发现相邻的仔基站后, 如图 3所示, 终端进 行相邻仔基站可接入性判断, 如果终端判断需要接入到仔基站, 则终端发起 扫描接入到相邻仔基站, 否则终端忽略相邻仔基站, 维持与当前服务基站的 通信或选择其他基站进行接入。
终端判断切换条件的流程图如图 4所示。 终端根据实例 1所述的方法发 现相邻的仔基站后, 终端判断相邻仔基站的类型。 如果相邻仔基站是开放的 仔基站, 终端进一步判断是否倾向于接入仔基站, 如果终端倾向于接入到仔 基站, 则终端决定发起对相邻仔基站的扫描, 通过与服务基站进行扫描消息 的交互请求扫描相邻的仔基站。
实例 3
终端根据实例 1所述的方法发现相邻的仔基站后, 如果相邻仔基站是完 全专有的仔基站或半专有的仔基站,则终端进一步判断是否维护有白表信息, 如果终端有白表信息, 则说明终端是某些专有用户组成员, 则终端决定发起 对相邻仔基站的扫描, 通过与服务基站进行扫描消息的交互请求扫描相邻的 仔基站。 可选的, 在终端发送扫描请求消息之前, 终端可发送邻区请求消息 给服务基站, 获取服务基站单播发送的包含专有仔基站信息的当前服务基站 的邻区列表消息, 从而方便扫描和切换过程。
实例 4
终端根据实例 1所述的方法发现相邻的仔基站后, 如果相邻仔基站是完 全专有的仔基站, 则终端进一步判断是否有白表信息, 如果终端没有白表信 息, 则说明终端不属于任何专有用户组, 因此无法访问专有的仔基站, 则终 端决定维持与当前服务基站的通信。
实例 5
终端根据实例 1所述的方法发现相邻的仔基站后, 如果相邻仔基站是开 放的仔基站, 但终端不倾向于接入仔基站。 此时终端检测到的服务基站的信 号越来越差, 已达到系统协定的触发切换的条件, 则终端判断是否能找到其 他合适的可接入基站, 如果能找到其他合适的可接入基站, 则终端可以决定 扫描其他基站, 如果扫描成功发起切换。 如果此时终端找不到其他合适的可 接入基站, 即使终端不倾向于接入仔基站, 终端依旧决定发起对当前仔基站 的扫描以保证通信服务的连续性。 实例 6
终端根据实例 1所述的方法发现相邻的仔基站后, 如果相邻仔基站是开 放的仔基站, 但终端不倾向于接入仔基站。 此时终端检测到的服务基站的信 号依旧很好, 则终端忽略相邻的仔基站, 继续与当前的服务基站保持通信连 接。
实例 7
终端根据实例 1所述的方法发现相邻的仔基站后, 如果相邻仔基站是半 专有的仔基站, 但终端没有白表信息。 此时终端检测到的服务基站的信号越 来越差, 已达到系统协定的触发切换的条件, 则终端判断是否能找到其他合 适的可接入基站, 如果能找到其他合适的可接入基站, 则终端决定扫描其他 基站, 如果扫描成功发起切换。 如果此时终端找不到其他合适的可接入基站, 即使终端不是半专有用户组成员, 终端依旧决定发起对当前仔基站的扫描以 保证通信服务的连续性。
实例 8
终端根据实例 1所述的方法发现相邻的仔基站后, 如果相邻仔基站是半 专有的仔基站, 但终端没有白表信息。 此时终端检测到的服务基站的信号依 旧很好, 则终端忽略相邻的仔基站, 继续与当前的服务基站保持通信连接。
图 5是终端发送扫描和切换请求接入到相邻仔基站的流程图, 具体包括 以下步骤:
步骤 501 , 终端发送扫描请求信息给当前服务基站请求扫描相邻仔基站; 终端可以根据相邻仔基站的类型请求不同的扫描间隔。
步骤 502, 当前服务基站向终端发送扫描响应消息;
步骤 503 , 终端根据扫描响应消息在给定的扫描间隔里对相邻仔基站进 行扫描;
步骤 504 , 终端根据扫描结果判断相邻仔基站是否适合接入, 如果是, 则进入步骤 505 , 否则进入步骤 510;
步骤 505 , 终端发送切换请求消息给当前服务基站, 请求切换到相邻仔 基站;
优选地, 终端发送的切换请求消息中包括相邻仔基站信息, 该相邻仔基 站是终端发现了的相邻仔基站。
步骤 506 , 接收到终端的切换请求消息后, 当前服务基站与相邻仔基站 协商是否允许所述终端接入, 以及如果允许接入的话该相邻仔基站具体的切 换参数信息;
步骤 507 , 终端接收切换命令消息;
步骤 508, 终端根据切换命令消息判断是否能接入相邻仔基站, 如果是, 则进入步骤 509, 否则进入步骤 511 ;
步骤 509, 终端发送切换指示消息给服务基站;
步骤 510, 终端开始网络重入到相邻仔基站, 本流程结束;
步骤 511 , 终端放弃接入到该相邻仔基站, 本流程结束。
图 6是终端根据扫描结果判断相邻仔基站是否适合接入的流程图, 对于 专有的相邻仔基站, 如果终端在扫描时获取到专有的相邻仔基站标识符信息 和 /或专有的相邻仔基站对应的专有用户组信息, 终端根据白表判断能否接入 所述专有的相邻仔基站, 具体包括以下步骤:
步骤 601 , 终端判断相邻仔基站信号强度等是否适合接入, 如果是, 则 进入步骤 602, 否则进入步骤 608;
根据扫描时获取的相邻仔基站信号的信噪比(CINR )、 接收信号强度指 示 (RSSI )等信号强度信息从信号强度角度判断相邻仔基站是否适合接入。
步骤 602 , 终端判断相邻仔基站是否为专有仔基站, 如果是则进入步骤 603 , 否则进入步骤 607; 步骤 603 , 终端获取相邻仔基站标识符信息;
步骤 604 , 终端判断白表中是否有匹配的基站标识符, 如果是, 则进入 步骤 607 , 否则进入步骤 605;
步骤 605 , 终端获取相邻仔基站发送的专有用户组信息;
步骤 606 , 终端判断白表中是否有匹配的专有用户组信息, 如果有, 则 进入步骤 607 , 否则进入步骤 608;
步骤 607 , 终端认为相邻仔基站适合接入;
步骤 608, 终端认为相邻仔基站不适合接入。
实例 9
终端根据实例 1所述的方法发现相邻的仔基站后, 继续根据实例 2, 3 , 5所述的方法决定终端需要接入到相邻的仔基站。 如图 5所示, 终端发送扫 描请求消息给服务基站请求扫描相邻的仔基站, 其中扫描请求消息中可根据 仔基站的类型请求不同的扫描间隔, 如专有仔基站可请求较长的间隔以获取 专有用户组信息, 而开放的仔基站可请求相对较短的扫描间隔。 服务基站收 到终端发送的扫描请求消息后, 给终端回复扫描响应消息。 终端收到服务基 站发送的扫描响应消息后, 在约定的扫描间隔内对相邻仔基站进行扫描。 如 果终端在扫描时根据相邻仔基站的信号强度等发现不适合接入,如图 6所示, 则终端认为相邻仔基站不适合接入, 从而放弃接入到该相邻仔基站。
实例 10
终端根据实例 1所述的方法发现相邻的仔基站后, 继续根据实例 2, 3 , 5所述的方法决定终端需要接入到相邻的仔基站。 如图 5所示, 终端发送扫 描请求消息给服务基站请求扫描相邻的仔基站, 其中扫描请求消息中可根据 仔基站的类型请求不同的扫描间隔, 如专有仔基站可请求较长的间隔以获取 专有用户组信息, 而开放的仔基站可请求相对较短的扫描间隔。 服务基站收 到终端发送的扫描请求消息后, 给终端回复扫描响应消息。 终端收到服务基 站发送的扫描响应消息后, 在约定的扫描间隔内对相邻仔基站进行扫描。 如 果终端在扫描时检测相邻仔基站的信号强度等发现适合接入, 如图 6所示, 则终端判断相邻仔基站是否为专有仔基站, 如果不是专有仔基站, 则终端认 为相邻仔基站适合接入, 并发送切换请求消息给服务基站。 服务基站收到终 端发送的切换请求消息后, 向相邻的目标仔基站发送切换请求消息。 相邻的 目标仔基站发送切换响应消息给服务基站告知是否允许终端接入。 服务基站 根据相邻的目标仔基站发送的切换响应消息发送切换命令消息给终端。 终端 接收到切换命令消息后 ,根据切换命令消息判断是否能接入到相邻的仔基站 , 如果能接入, 则终端发送切换指示信息给服务基站, 并开始网络重入到相邻 的仔基站; 如果切换命令消息告知终端不允许其接入, 则终端放弃接入到该 相邻的仔基站。
实例 11
终端根据实例 1所述的方法发现相邻的仔基站后, 继续根据实例 2, 3 , 5所述的方法决定终端需要接入到相邻的仔基站。 如图 5所示, 终端发送扫 描请求消息给服务基站请求扫描相邻的仔基站, 其中扫描请求消息中可根据 仔基站的类型请求不同的扫描间隔, 如专有仔基站可请求较长的间隔以获取 专有用户组信息, 而开放的仔基站可请求相对较短的扫描间隔。 服务基站收 到终端发送的扫描请求消息后, 给终端回复扫描响应消息。 终端收到服务基 站发送的扫描响应消息后, 在约定的扫描间隔内对相邻仔基站进行扫描。 如 果终端在扫描时检测相邻仔基站的信号强度等发现适合接入, 如图 6所示, 则终端判断相邻仔基站是否为专有仔基站, 如果是专有仔基站, 则终端在扫 描时进一步获取相邻仔基站的标识符信息, 并判断白表中是否有匹配的基站 标识符信息。 如果白表中有匹配的相邻仔基站标识符信息, 则终端认为相邻 仔基站适合接入, 并发送切换请求消息给服务基站。 服务基站收到终端发送 的切换请求消息后, 向相邻的目标仔基站发送切换请求消息。 相邻的目标仔 基站发送切换响应消息给服务基站告知是否允许终端接入。 服务基站根据相 邻的目标仔基站发送的切换响应消息发送切换命令消息给终端。 终端接收到 切换命令消息后, 根据切换命令消息判断是否能接入到相邻的仔基站, 如果 能接入, 则终端发送切换指示信息给服务基站, 并开始网络重入到相邻的仔 基站; 如果切换命令消息告知终端不允许其接入, 则终端放弃接入到该相邻 的仔基站。
实例 12
终端根据实例 1所述的方法发现相邻的仔基站后, 继续根据实例 2, 3 ,
5所述的方法决定终端需要接入到相邻的仔基站。 如图 5所示, 终端发送扫 描请求消息给服务基站请求扫描相邻的仔基站, 其中扫描请求消息中可根据 仔基站的类型请求不同的扫描间隔, 如专有仔基站可请求较长的间隔以获取 专有用户组信息, 而开放的仔基站可请求相对较短的扫描间隔。 服务基站收 到终端发送的扫描请求消息后, 给终端回复扫描响应消息。 终端收到服务基 站发送的扫描响应消息后, 在约定的扫描间隔内对相邻仔基站进行扫描。 如 果终端在扫描时检测相邻仔基站的信号强度等发现适合接入, 如图 6所示, 则终端判断相邻仔基站是否为专有仔基站, 如果是专有仔基站, 则终端在扫 描时进一步获取相邻仔基站的标识符信息, 并判断白表中是否有匹配的基站 标识符信息。 如果白表中没有匹配的相邻仔基站标识符信息, 则终端进一步 获取相邻仔基站发送的专有用户组信息, 并判断白表中是否有匹配的专有用 户组信息。 如果终端在白表中有匹配的专有用户组信息, 则终端认为相邻仔 基站适合接入, 并发送切换请求消息给服务基站。 服务基站收到终端发送的 切换请求消息后, 向相邻的目标仔基站发送切换请求消息。 相邻的目标仔基 站发送切换响应消息给服务基站告知是否允许终端接入。 服务基站根据相邻 的目标仔基站发送的切换响应消息发送切换命令消息给终端。 终端接收到切 换命令消息后, 根据切换命令消息判断是否能接入到相邻的仔基站, 如果能 接入, 则终端发送切换指示信息给服务基站, 并开始网络重入到相邻的仔基 站; 如果切换命令消息告知终端不允许其接入, 则终端放弃接入到该相邻的 仔基站。
实例 13
终端根据实例 1所述的方法发现相邻的仔基站后, 继续根据实例 2, 3 , 5所述的方法决定终端需要接入到相邻的仔基站。 如图 5所示, 终端发送扫 描请求消息给服务基站请求扫描相邻的仔基站, 其中扫描请求消息中可根据 仔基站的类型请求不同的扫描间隔, 如专有仔基站可请求较长的间隔以获取 专有用户组信息, 而开放的仔基站可请求相对较短的扫描间隔。 服务基站收 到终端发送的扫描请求消息后, 给终端回复扫描响应消息。 终端收到服务基 站发送的扫描响应消息后, 在约定的扫描间隔内对相邻仔基站进行扫描。 如 果终端在扫描时检测相邻仔基站的信号强度等发现适合接入, 如图 6所示, 则终端判断相邻仔基站是否为专有仔基站, 如果是专有仔基站, 则终端在扫 描时进一步获取相邻仔基站的标识符信息, 并判断白表中是否有匹配的基站 标识符信息。 如果白表中没有匹配的相邻仔基站标识符信息, 则终端进一步 获取相邻仔基站发送的专有用户组信息, 并判断白表中是否有匹配的专有用 户组信息。 如果终端在白表中没有匹配的专有用户组信息, 则终端认为相邻 仔基站不适合接入, 终端放弃接入到该相邻的仔基站。
图 7是服务基站判断是否允许终端切换到相邻专有仔基站的流程图, 具 体包括以下步骤:
步骤 701, 服务基站接收终端发送的切换请求消息;
切换请求消息中携带有该终端的信息。
步骤 702, 服务基站向目标仔基站发送切换请求消息;
步骤 703 , 目标仔基站根据收到的切换请求消息判断请求接入的终端是 否是其对应专有用户组成员, 如果是, 则进入步骤 705 , 否则进入步骤 704; 如果相邻仔基站是专有的仔基站, 相邻仔基站根据对应的专有用户组信 息判断是否允许所述终端接入, 向服务基站返回响应消息, 指示其是否允许 所述终端接入; 如果允许终端接入, 即该终端为专有用户组成员, 相邻仔基 站可在返回的响应消息中携带供终端接入的参数, 通过当前服务基站发送给 终端; 如果终端不是相邻仔基站对应的专有用户组的成员, 则相邻仔基站向 服务基站返回拒绝终端接入的响应消息;
如果相邻仔基站是半专有的仔基站, 如果终端在该半专有仔基站的专有 用户组中, 则处理同专有仔基站; 如果终端不在该仔基站的专有用户组中, 该半专有仔基站可根据自己的原则判断是否允许终端接入, 例如此时该半专 有仔基站接入的终端已经到达一定数量, 该半专有仔基站为保证服务质量不 再接入非成员终端, 则相邻半专有仔基站向该终端的当前服务基站返回拒绝 终端接入的响应消息。
步骤 704, 目标仔基站发送切换响应消息接受切换请求, 执行步骤 706; 步骤 705 , 目标仔基站发送切换响应消息拒绝切换请求, 执行步骤 706; 步骤 706, 服务基站接收目标仔基站的切换响应消息;
步骤 707 , 服务基站发送相应的切换命令消息给终端, 指示相邻仔基站 是否允许所述终端接入(允许或拒绝) 。
实例 14
终端根据实例 1所述的方法发现相邻的仔基站后, 继续根据实例 2, 3 , 5 所述的方法决定终端需要接入到相邻的仔基站。 终端发送扫描请求消息给 服务基站请求扫描相邻的仔基站, 其中扫描请求消息中可根据仔基站的类型 请求不同的扫描间隔, 如专有仔基站可请求较长的间隔以获取专有用户组信 息, 而开放的仔基站可请求相对较短的扫描间隔。 服务基站收到终端发送的 扫描请求消息后, 给终端回复扫描响应消息。 终端收到服务基站发送的扫描 响应消息后, 在约定的扫描间隔内对相邻仔基站进行扫描。 如果终端在扫描 时检测相邻仔基站的信号强度等发现适合接入, 则终端认为相邻仔基站适合 接入, 并发送切换请求消息给服务基站。 服务基站收到终端发送的切换请求 消息后, 向相邻的目标仔基站发送切换请求消息。 如果相邻的目标仔基站是 专有仔基站, 则如图 7所示, 目标仔基站根据服务基站发送的切换请求信息 判断终端是否是其对应的专有用户组成员, 如果是则目标仔基站发送切换响 应消息给服务基站告知其允许终端接入, 否则目标仔基站发送切换响应消息 给服务基站告知其拒绝终端接入。 服务基站根据相邻的目标仔基站发送的切 换响应消息发送切换命令消息给终端。 终端接收到切换命令消息后, 根据切 换命令消息判断是否能接入到相邻的仔基站, 如果能接入, 则终端发送切换 指示信息给服务基站, 并开始网络重入到相邻的仔基站; 如果切换命令消息 告知终端不允许其接入, 则终端放弃接入到该相邻的仔基站。
一种发现相邻仔基站的终端, 包括测量模块, 判断模块, 其中: 所述测量模块用于在所述终端与当前服务基站通信时, 测量与当前服务 基站同频的同步序列;
所述判断模块, 根据所述同步序列发现是否有相邻仔基站。
具体的发现操作参见方法的描述。
优选地, 所述终端还包括切换预处理模块, 用于判断相邻仔基站的可接 入性, 并根据判断结果调用相应的模块进行处理。
相应模块包括: 扫描模块和切换模块, 分别用于执行对相邻仔基站的扫 描, 和发起切换。
实现切换预处理的终端, 包括判断模块和切换预处理模块, 其中: 所述判断模块, 用于判断相邻基站是否为仔基站, 如果是调用所述切换 预处理模块;
所述切换预处理模块, 用于判断相邻仔基站的可接入性, 并根据判断结 果调用相应的模块进行处理。
判断模块判断相邻基站是否为仔基站可釆用本发明所述的方法, 也可釆 用现有技术的方法。
切换预处理模块对可接入性的判断, 参见方法的描述。
尽管为示例目的, 已经公开了本发明的优选实施例, 本领域的技术人员 将意识到各种改进、 增加和取代也是可能的, 因此, 本发明的范围应当不限 于上述实施例。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性
本发明方法通过终端对同频的相邻仔基站的同步序列进行测量, 根据同 步序列判断相邻基站的类型, 如果发现有仔基站的存在, 终端主动发起扫描 和切换请求接入到仔基站, 这种方式可以在切换之前避免终端周期性的对相 邻基站的扫描, 使终端以很少的开销的发现相邻仔基站并主动接入, 从而改 善无线通信系统基站切换效率, 降低通信和终端开销。

Claims

权 利 要 求 书
1、 一种无线通信系统中仔基站发现方法, 该方法包括:
终端在与当前服务基站通信时, 测量与当前服务基站同频的同步序列, 根据所述同步序列发现是否有相邻仔基站。
2、 如权利要求 1所述的方法, 其中,
所述终端测量与当前服务基站同频的同步序列的步骤包括: 获取辅同步 序列和 /或小区标识信息。
3、 如权利要求 2所述的方法, 其中,
所述根据同步序列发现是否有相邻仔基站的步骤包括: 终端根据辅同步 序列和 /或小区标识信息判断基站类型, 如果基站类型为仔基站, 则所述终端 发现存在相邻仔基站。
4、 如权利要求 3所述的方法, 其中,
所述终端预先保存有系统配置的基站类型与辅同步序列或小区标识的映 射关系, 根据所述映射关系判断基站类型。
5、 如权利要求 1所述的方法, 该方法还包括:
终端在发现相邻仔基站后进行切换预处理,判断相邻仔基站的可接入性, 并根据判断结果进行相应处理。
6、 如权利要求 5所述的方法, 其中,
在所述终端判断相邻仔基站的可接入性的步骤中, 终端根据以下信息中 的任意一种或多种的组合判断相邻仔基站的可接入性:
仔基站类型、 当前服务基站信号质量、 终端是否倾向于接入仔基站、 白 表信息、 是否有其他备选基站。
7、 如权利要求 5所述的方法, 其中,
根据判断结果进行相应处理的步骤包括:
如果终端判断相邻仔基站可接入, 则终端发起对相邻仔基站的扫描; 如果终端判断相邻仔基站不可接入, 则终端维持与当前服务基站的通信 或选择切换到其他基站。
8、 一种无线通信系统中仔基站切换预处理方法, 该方法包括: 终端在发现相邻仔基站后进行切换预处理, 判断所述相邻仔基站的可接 入性, 并根据判断结果进行相应处理。
9、 如权利要求 8所述的方法, 其中,
在所述终端判断所述相邻仔基站的可接入性的步骤中, 终端根据以下信 息中的任意一种或多种的组合判断相邻仔基站的可接入性:
仔基站类型、 当前服务基站信号质量、 终端是否倾向于接入仔基站、 白 表信息、 是否有其他备选基站。
10、 如权利要求 8或 9所述的方法, 其中, 在所述终端判断所述相邻仔 基站的可接入性的步骤中,
若下述情况之一成立, 则终端判断所述相邻仔基站可接入:
相邻仔基站类型是开放的仔基站, 且终端倾向于接入仔基站;
相邻仔基站是专有的仔基站类型, 且终端有白表信息;
相邻基站是半专有仔基站或开放仔基站, 当前服务基站的信号质量差, 且没有其他备选基站;
若下述情况之一成立, 终端判断所述相邻仔基站不可接入:
相邻仔基站是开放的仔基站, 但终端不倾向于接入仔基站, 并且终端此 时与服务基站的通信质量良好;
相邻仔基站是开放的仔基站, 但终端不倾向于接入仔基站, 并且终端此 时与服务基站的信号质量差, 但终端有其他备选基站;
相邻仔基站是完全专有的仔基站, 但终端没有白表信息;
相邻仔基站是半专有的仔基站, 但终端没有白表信息, 此时终端当前服 务基站的通信质量良好;
相邻仔基站是半专有的仔基站, 此时终端当前服务基站服务质量差, 但 是终端有其他备选基站。
11、 如权利要求 8所述的方法, 其中,
所述终端根据判断结果进行相应处理的步骤包括:
如果终端判断相邻仔基站可接入, 则终端发起对相邻仔基站的扫描; 如果终端判断相邻仔基站不可接入, 则终端维持与当前服务基站的通信 或选择切换到其他基站。
12、 如权利要求 11所述的方法, 其中,
如果终端判断相邻仔基站可接入, 且该相邻仔基站为专有仔基站, 终端 在发起相邻仔基站的扫描或发起切换请求接入到相邻仔基站之前, 所述方法 还包括: 向当前服务基站发送邻区请求消息, 获取服务基站单播发送的包含 该专有仔基站信息的邻区列表消息。
13、 如权利要求 11所述的方法, 其中,
所述终端发起对相邻仔基站的扫描的步骤包括:
步骤 1 , 终端向当前服务基站发送扫描请求消息请求扫描相邻仔基站; 步骤 2 , 终端根据收到的当前服务基站发送的扫描响应消息, 对相邻仔 基站进行扫描, 并判断相邻仔基站是否适合接入, 如果适合接入, 终端发起 切换。
14、 如权利要求 13所述的方法, 其中,
在所述步骤 1中, 终端根据相邻仔基站的类型请求不同的扫描间隔。
15、 如权利要求 13所述的方法, 其中,
所述终端发起切换的步骤包括:
步骤 a, 终端发送切换请求消息请求切换到相邻仔基站;
步骤 b , 所述终端接收到所述相邻仔基站的切换命令消息后, 进行网络 重入到相邻仔基站。
16、 如权利要求 15所述的方法, 其中,
在所述步骤 a中, 所述终端发送的切换请求消息中包括所述相邻仔基站 信息。
17、 如权利要求 15所述的方法, 其中,
在所述步骤 a中, 所述终端发送切换请求消息到当前服务基站请求切换 到相邻仔基站;
在所述步骤 b之前, 所述终端发起切换的步骤还包括: 所述当前服务基 站接收到终端的切换请求后, 与相邻仔基站协商是否允许所述终端接入; 所述当前服务基站发送切换命令消息给终端, 指示终端相邻仔基站是否 允许其接入。
18、 如权利要求 17所述的方法,其中, 所述服务基站与相邻仔基站协商 是否允许所述终端接入的步骤包括:
服务基站发送切换请求消息给相邻仔基站;
所述相邻仔基站如果是专有的仔基站, 根据对应的专有用户组信息和 /或 基站标识信息判断是否允许所述终端接入; 以及
所述相邻仔基站向服务基站返回切换响应消息。
19、 一种发现相邻仔基站的终端, 包括测量模块和判断模块, 其中: 所述测量模块设置为: 在所述终端与当前服务基站通信时, 测量与当前 服务基站同频的同步序列;
所述判断模块设置为: 根据所述同步序列发现是否有相邻仔基站。
20、 如权利要 18 所述的终端, 所述终端还包括: 切换预处理模块, 其 设置为: 判断相邻仔基站的可接入性, 并根据判断结果调用相应的模块进行 处理。
21、 一种实现切换预处理的终端, 包括判断模块和切换预处理模块, 其 中:
所述判断模块设置为: 判断相邻基站是否为仔基站, 如果是调用所述切 换预处理模块;
所述切换预处理模块设置为: 判断相邻仔基站的可接入性, 并根据判断 结果调用相应的模块进行处理。
PCT/CN2010/078912 2010-01-12 2010-11-19 无线通信系统中仔基站发现方法、切换预处理方法及终端 WO2011085616A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010004715.6 2010-01-12
CN201010004715.6A CN102123426B (zh) 2010-01-12 2010-01-12 无线通信系统中仔基站发现方法、切换预处理方法及终端

Publications (1)

Publication Number Publication Date
WO2011085616A1 true WO2011085616A1 (zh) 2011-07-21

Family

ID=44251836

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2010/078912 WO2011085616A1 (zh) 2010-01-12 2010-11-19 无线通信系统中仔基站发现方法、切换预处理方法及终端

Country Status (2)

Country Link
CN (1) CN102123426B (zh)
WO (1) WO2011085616A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105407525B (zh) * 2014-09-12 2019-01-01 中国移动通信集团公司 一种空口同步重建的方法、装置及基站
EP3206433B1 (en) 2014-10-30 2018-12-05 Huawei Technologies Co., Ltd. Inter-small cell switching methods, devices and system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101047430A (zh) * 2006-06-16 2007-10-03 华为技术有限公司 一种选择基站的方法及系统
WO2009045969A2 (en) * 2007-10-01 2009-04-09 Qualcomm Incorporated Equivalent home id for mobile communications

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1882162A (zh) * 2005-06-13 2006-12-20 华为技术有限公司 无线通信系统中避免乒乓切换的实现方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101047430A (zh) * 2006-06-16 2007-10-03 华为技术有限公司 一种选择基站的方法及系统
WO2009045969A2 (en) * 2007-10-01 2009-04-09 Qualcomm Incorporated Equivalent home id for mobile communications

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CAI LING-YUN ET AL.: "Cell Search Algorithm in Beyond 3G Mobile Communication Systems.", TELECOMMUNICATION ENGINEERING., April 2005 (2005-04-01), pages 58 - 60 *

Also Published As

Publication number Publication date
CN102123426A (zh) 2011-07-13
CN102123426B (zh) 2015-05-13

Similar Documents

Publication Publication Date Title
US9237477B2 (en) Method and apparatus providing multi-level proximity indication and small cell discovery
JP6181480B2 (ja) 限定加入者グループに対してインバウンドモビリティを提供するためのpciの混乱を解決する方法および装置
RU2267224C2 (ru) Способ переключения каналов связи в беспроводной локальной сети, а также точка доступа и мобильная станция, обеспечивающие способ переключения каналов связи
TWI459834B (zh) 通訊裝置
JP4570655B2 (ja) 無線ネットワークにおけるmacレイヤハンドオフレイテンシを低減するための方法及びシステム
CN104541547B (zh) 控制接入无线局域网的方法、装置、设备和系统
JP2017153149A (ja) フェムトアクセスポイントの検出のための帯域外スキャニング
KR20100041236A (ko) 펨토 기지국으로의 핸드 오버를 위한 무선 통신 시스템 및 이를 위한 방법
KR20090080727A (ko) 다른 주파수 대역을 사용하는 시스템 간 단말의 핸드오버를 위한 장치 및 방법
WO2014198013A1 (zh) 无线通信方法、用户设备及网络节点
JP2015510742A (ja) 帯域外リンクを用いた近接指示
WO2008154883A1 (fr) Procédé pour transmission à une cellule privée et son équipement
WO2017119828A1 (en) Method and apparatus enabling deployment information controlled connection procedures in a wireless network
JP2022521073A (ja) ハンドオーバを開始するための方法、ノード、およびue
WO2014153683A1 (en) Paging in mobile networks using independent paging cells and access cells
JP2012065140A (ja) 無線基地局装置、通信システムおよびセル制御方法
WO2011069405A1 (zh) 切换预处理方法
KR20100046492A (ko) 인터 rat를 이용한 핸드오버 처리 방법 및 이에 이용되는 이동통신 단말 장치
WO2011085616A1 (zh) 无线通信系统中仔基站发现方法、切换预处理方法及终端
WO2015042966A1 (zh) 建立回程链路方法、装置及系统
CN107295588B (zh) Csg小区的接入方法及宏基站
CN108174422B (zh) 高低频切换方法、配置终端的方法及装置
WO2022054267A1 (ja) 端末、基地局、通信方法及びプログラム
KR20180112807A (ko) 이종 네트워크들에서 핸드오버를 수행하기 위한 시스템들 및 방법들
WO2009012678A1 (fr) Procédé, terminal utilisateur, dispositif côté réseau et système de communication sans fil pour nouvelle sélection, d'une macro-cellule à un réseau limité

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10842898

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10842898

Country of ref document: EP

Kind code of ref document: A1