WO2009079852A1 - Procédé pour améliorer le taux de succès de recherche de mobile dans un système de communication sans fil à large bande passante - Google Patents

Procédé pour améliorer le taux de succès de recherche de mobile dans un système de communication sans fil à large bande passante Download PDF

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Publication number
WO2009079852A1
WO2009079852A1 PCT/CN2007/003743 CN2007003743W WO2009079852A1 WO 2009079852 A1 WO2009079852 A1 WO 2009079852A1 CN 2007003743 W CN2007003743 W CN 2007003743W WO 2009079852 A1 WO2009079852 A1 WO 2009079852A1
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WO
WIPO (PCT)
Prior art keywords
paging
base station
terminal
location update
group
Prior art date
Application number
PCT/CN2007/003743
Other languages
English (en)
French (fr)
Inventor
Ning Wang
Wentao Zhou
Original Assignee
Zte Corporation
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 Zte Corporation filed Critical Zte Corporation
Priority to US12/809,787 priority Critical patent/US8200254B2/en
Priority to PCT/CN2007/003743 priority patent/WO2009079852A1/zh
Priority to CN2007801005566A priority patent/CN101803414B/zh
Publication of WO2009079852A1 publication Critical patent/WO2009079852A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/06—User notification, e.g. alerting and paging, for incoming communication, change of service or the like using multi-step notification by changing the notification area
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Definitions

  • the present invention relates to a mobile communication technology, and in particular to a method for improving paging success rate in a broadband wireless communication system. Background technique
  • WiMAX Worldwide Interoperability for Microwave Access
  • WiMAX has high speed and quality of service (QoS) flexibility.
  • QoS quality of service
  • FIG. 1 it is a basic network structure diagram of a WiMAX system, including a base station (BS), an access gateway (AGW), an authenticator function module (Authenticator), a paging controller (Paging Controller), and an authentication authorization meter.
  • Functional modules such as the fee module (AAA).
  • the paging controller and the authenticator function module are generally located at the access gateway, and the paging controller can be divided into an anchor paging controller and a relay paging controller according to functions.
  • the R6 interface is between the base station and the access gateway or the paging controller, and the R4 connection is between the relay paging controller and the Anchor paging controller.
  • the idle (Idle) mode is a very important power saving mode in the iMAX system.
  • the terminal in the idle mode sends the paging group information to the paging controller (Paging Controller) through various location update mechanisms.
  • the commonly used location update mechanism mainly includes the periodic location update and the paging group location update, and is idle.
  • the terminal in the mode needs to perform downlink synchronization first in each listening interval. During the downlink synchronization process, the terminal needs to search for a downlink channel description (DCD) message according to the WiMAX protocol description, if the paging group list in the DCD message does not include the terminal.
  • DCD downlink channel description
  • the terminal will consider that it has moved across the paging group, and will trigger the location update procedure to notify the paging controller of the latest paging group location information.
  • the access gateway After the downlink data addressed to the terminal is sent to the access gateway, the access gateway notifies the Anchor paging controller to perform paging, and the Anchor paging controller can notify the terminal in the paging group through the relay paging controller. All or part of the base stations send a paging broadcast message to the terminal to notify the terminal to exit the idle mode. Receive data.
  • the Network Working Group (NWG) under the WiMAX Forum specifies the process for the terminal to enter idle mode, page and exit idle mode in the Phase 3 standard.
  • the paging controller can initiate paging according to the paging group information to which the terminal reported by the location update belongs.
  • FIG. 2 it is a schematic diagram of terminal movement in the idle mode of the WiMAX system.
  • the paging controller manages the base station 1, the base station 2 and the base station 3, wherein the base station 1 belongs to the paging group 1, and the base station 3 belongs to the paging group 2, and the base station 2 belongs to the paging group 1 and the paging group 2 at the same time.
  • the terminal enters the idle mode at the base station 1 and selects the paging group 1 as its current paging group.
  • the base station 2 When the terminal moves from the cell coverage of the base station 1 to the cell coverage of the base station 2, the base station 2 still belongs to the paging group 1 Therefore, the location update of the paging area update triggering mode is not performed; when the terminal rapidly moves from the cell coverage of the base station 2 to the cell coverage of the base station 3, the terminal needs to perform downlink synchronization first, and receives the DCD under the new base station 3.
  • the message detects that a cross-paging group movement has occurred and initiates a location update process accordingly. If the paging of the terminal occurs before the terminal successfully performs the new location update procedure, the terminal will fail the first paging, and the paging controller can only page the terminal through the subsequent paging retransmission message. In the most severe case, if the paging controller is not able to receive a location update message from the terminal before the page count is exhausted, the paging terminal will fail. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method for improving the paging success rate in a broadband wireless communication system, which improves the paging success rate of the terminal.
  • the present invention provides a method for improving the paging success rate in a broadband wireless communication system, including the following steps:
  • the current serving base station initiates a location update procedure; in the location update procedure, the anchor paging controller updates the location information of the terminal, and includes the current serving base station and its neighboring base stations in the paging range;
  • the terminal monitors the paging message according to the paging parameter of the original paging group, and the anchor paging controller needs to page the terminal.
  • paging is initiated to a plurality of base stations including the current serving base station and its neighboring base station according to the paging parameter of the original paging group.
  • the above method may also have the following features:
  • the anchor paging controller adds other paging group information of the plurality of paging groups except the original paging group in the location information of the terminal; After the location initiated by the area is successfully updated and before the location update of the paging group succeeds, the anchor paging controller needs to page the terminal, and the paging parameters of the original paging group are used to the multiple The base station within the paging group initiates paging.
  • the above method may also have the following features:
  • the anchor paging controller In the location update process initiated by the overlapping area, the anchor paging controller adds information for identifying the current serving base station of the terminal and its neighboring base station in the location information of the terminal; After the location update succeeds and before the location update of the paging group succeeds, the anchor paging controller needs to page the terminal, and according to the paging parameter of the original paging group, the base station and the base station in the original paging group The neighboring base station initiates paging.
  • the above method may also have the following features:
  • the terminal moves from the base station BS A belonging to the paging group A to the range of the other base station BSAB, as judged by the downlink broadcast message of the currently serving serving base station BSAB that it is currently in the original paging group A and contains one or more
  • the overlapping area of the paging group set B of the new paging group triggers the location update process
  • the base station BSAB sends a location update request message to the anchor paging controller of the terminal, after the anchor paging controller receives, in the location information of the terminal
  • the paging group information included in the paging group set B is increased, and the identifier of the paging group A and its paging parameters are retained;
  • the terminal still listens for the paging message according to the paging parameter of the paging group A,
  • the anchor paging controller needs to page the terminal, according to the paging parameter of the paging group A, the base station of the paging group A and the paging group included in the paging group set B are recorded in the terminal location information.
  • the base station initiates paging.
  • the above method may also have the following features:
  • Step (b) A parameter of the paging group identifier PGIDs is added to the location update request message sent by the base station BSAB, and the parameter includes at least the identifier of the paging group included in the paging group set B, and the anchor paging control After receiving the device, the identifier of the paging group included in the paging group set B is added to the location information of the terminal; or
  • Step (b) The location update request message sent by the base station BSAB does not include the identifier of the paging group B, and the anchor paging controller determines, according to the information of the paging group to which the base station belongs, that the base station BSAB belongs to both the original paging group A and the When paging group set B, or an intermediate paging controller that transmits a message between the base station BSAB and the anchor paging controller completes the judgment of the paging group to which the base station BSAB belongs and notifies the anchor paging controller, The descriptive paging controller adds the identifier of the paging group included in the paging group set B to the location information of the terminal.
  • the above method may also have the following features:
  • the terminal moves from the base station BS A belonging to the paging group A to the range of the other base station BSAB, such as judging that the paging is currently in the paging group A based on the downlink broadcast message of the currently serving serving base station BSAB.
  • the overlapping area of the group triggers the location update process;
  • the base station BSAB sends a location update request message to the anchor paging controller of the terminal, after the anchor paging controller receives, in the location information of the terminal Adding information of the base station BSAB and its neighboring base station, while retaining the identity of the paging group A and its paging parameters;
  • the above method may also have the following features:
  • Step (b) The location update request message sent by the base station BSAB adds a parameter of the neighbor base station identity BSIDs, where the parameter includes at least the neighbor base station identity of the base station BSAB, and after the anchor paging controller receives the The neighboring cell base station identifier is added to the location information of the terminal; or Step (b)
  • the location update request message sent by the base station BSAB does not include the neighbor cell identity of the base station BSAB, and the anchor paging controller searches for the neighbor cell identity of the base station BSAB according to the base station topology relationship, or at the base station BSAB and
  • the intermediate paging controller that transmits the message between the anchor paging controllers finds the neighbor base station identity of the base station BSAB and notifies the anchor paging controller, and the description paging controller connects the base station BSAB and The neighboring cell base station identifier is added to the location information of the terminal.
  • the above method may also have the following features:
  • the terminal After the terminal moves into the range of another base station, it listens to the downlink broadcast message of the current serving base station, and determines that the identifiers of the plurality of paging groups including the original paging group appear in the paging group list of the downlink broadcast message. Then, it is judged that the overlapping area of the plurality of paging groups including the paging group A is currently triggered, and the location update process is actively triggered.
  • the above method may also have the following features:
  • the anchor paging controller After the terminal moves from the overlapping area to the range of the base station that does not belong to the original paging group, initiates a location update process for the paging group, in the location update process, the anchor paging controller will The paging group and the paging parameter of the terminal are updated to the paging group to which the current serving base station belongs and the paging parameter thereof; after the location update succeeds, the terminal monitors the paging message according to the paging parameter of the new paging group. And the anchor paging controller pages the terminal, and initiates paging to the base station in the new paging group according to the paging parameter of the new paging group.
  • the above method may also have the following features:
  • the paging message is transmitted in a single-step manner of a part of the base stations in a paging range, or in a multi-step manner in which all base stations in a paging range are used.
  • the location update process triggered by the terminal in the overlapping area is divided into the following steps:
  • Location update request message After receiving the location update request message, the anchor paging controller returns a location update response message to the current serving base station directly or through a relay paging controller, and updates the location information of the paging terminal. Include the current serving base station and its neighboring base stations, and retain the identity of the original paging group where the terminal is located and its paging parameters;
  • the current serving base station After receiving the location update response message, the current serving base station feeds back a location update acknowledgement message to the anchor paging controller, and feeds back the result of the location update to the terminal through the ranging response message.
  • the above method may also have the following features:
  • the method is applied to a microwave access global interworking WiMAX system.
  • the update process is triggered when the terminal is in the overlapping area of the paging group, and the location update is performed to ensure that the paging parameters on the network side are updated in time. Therefore, the paging success rate of the terminal is greatly improved, and the paging range reliability is also ensured, and the paging broadcast storm caused by paging in an excessively large range is avoided.
  • 1 is a basic network structure diagram of a WiMAX system in the prior art
  • FIG. 2 is a schematic diagram of terminal movement in an idle mode of a WiMAX system in the prior art
  • Figure 3 is a flow chart of a preferred embodiment 1 of the present invention.
  • the terminal in the idle mode gradually moves from the coverage of the base station 1 to the coverage of the base station 2 (the overlapping area of the paging group 1 and the paging group 2, or the boundary area of the paging group 1), and then from the base station 2 The coverage moves to the coverage of base station 3.
  • the possible location of the terminal is determined in advance, without affecting the location update process and the paging process. Take the implementation of paging.
  • the method for improving the paging success rate in the broadband wireless communication system proposed by the present invention includes two preferred embodiments.
  • the paging group identifier (PGIDs) is used to determine the current location of the terminal, and the corresponding location update is performed.
  • Step S301 the terminal enters an idle mode within a range covered by the base station 1, selects the base station 1 as a current serving base station (Server BS) of the terminal, performs downlink synchronization and receives a DCD message; and the paging controller specifies that the terminal currently belongs to the paging group. 1 and specifying a corresponding paging parameter, the paging parameter including at least a paging cycle (PAGING_CYCLE), a paging offset (PAGING OFFSET), and a paging interval length;
  • PAGING_CYCLE paging cycle
  • PAGING OFFSET paging offset
  • the terminal since the terminal only finds the paging group identifier (PGIDs) of the paging group 1 in the DCD message, the terminal does not trigger the location update procedure.
  • PIDs paging group identifier
  • Step S302 when the terminal moves to the coverage of the base station 2, and listens to the downlink broadcast message, if it is determined to enter the overlapping area of the two paging groups, the terminal initiates a location update procedure to the base station 2, and the base station 2 reports the paging group 2 information to the terminal.
  • Anchoring paging controller when the terminal moves to the coverage of the base station 2, and listens to the downlink broadcast message, if it is determined to enter the overlapping area of the two paging groups, the terminal initiates a location update procedure to the base station 2, and the base station 2 reports the paging group 2 information to the terminal.
  • the service BS is set to the base station 2, and wakes up to listen for the downlink broadcast message during the paging listening interval.
  • the terminal Before starting the monitoring, the terminal first needs to perform downlink synchronization and receive the DCD message. If the PGIDs of paging group 1 and the PGIDs of other paging groups appear in the paging group list of the DCD message, the paging of paging group 2 The group identifier (PGIDs) does not belong to the paging group 1 to which the terminal currently belongs, and the terminal considers that it has reached the paging area boundary, that is, the terminal is in the overlapping area of paging group 1 and paging group 2.
  • the base station can also obtain information of the paging group to which the base station 2 belongs, such as the MOB-NBR-ADV or MOB-PAG-ADV message, from other downlink broadcast messages.
  • the terminal can actively trigger the location update process at this time. Alternatively, the terminal may also trigger the location update process by the location update timer period (the former method is recommended).
  • the terminal can trigger a location update through the ranging message.
  • the base station 2 After receiving the ranging message, the base station 2 sends a location update request message (R6 interface location update request message) to the Anchor paging controller to which the terminal belongs, and the location update request message includes information of the paging group 2 (including the paging group).
  • the PGIDs of 2), the R6 interface location update request message used in this embodiment is as shown in Table 1.
  • a parameter "PGIDs" (paging group identifier) is added to the original location update request to indicate the paging group where the terminal is currently located.
  • the original parameter "Paging Information" in the message can indicate the information of the paging group 1
  • the paging group 2 identifier may be included, that is, the paging group in which the terminal is located may not be included, and of course, the identifiers of paging group 1 and paging group 2 may be included at the same time.
  • Offset proposes a value
  • the base station 2 needs to send a location update request message to the Anchor paging controller through the relay paging controller, including the R4 interface location update request message and the R6. Interface location update request message.
  • the content of the R6 interface location update request message is shown in Table 1.
  • the content of the R4 interface location update request message is shown in Table 2.
  • a parameter "PGIDs" is also added to the location update request, including the paging group 2 identity, and may of course also include the identity of paging group 1.
  • the Anchor paging controller or the intermediate paging controller needs to record the correspondence between the base station and the paging group. In this way, the anchor paging controller or the intermediate paging controller can find the paging group to which it belongs, that is, the paging group 1 and the paging group 2, according to the base station 2 that reports the location update message, and then the terminal can be determined to have moved. In the overlapping area of paging group 1 and paging group 2, the Anchor paging controller can add the paging group identifier PGID of paging group 2 to the paging group information in the terminal location information.
  • the paging group 2 information such as the identifier of the paging group 2 needs to be notified to the Anchor paging controller.
  • Step S303 after receiving the location update request message, the anchor paging controller identifies the paging group information added to the terminal location information according to the paging group 2 in the location update request message PGISs parameter, and the paging group to which the terminal belongs And the paging parameter is unchanged, and then the location update response message is fed back to the base station 2 directly or through the relay paging controller;
  • the location update on the network side does not change the terminal currently belongs to the paging group 1, but only the location information of the terminal is added.
  • the group 2 identifier is used for auxiliary positioning, and the terminal still belongs to paging group 1, and the paging parameters of the terminal are not changed. If the location update fails, the paging controller does nothing but return the failed location update response, waiting for the next location update process.
  • Step S304 after receiving the location update response message, the base station 2 feeds back the location update confirmation message to the Anchor paging controller directly or through the relay paging controller, and feeds back the result of the location update to the terminal through the ranging response message of the air interface;
  • Step S305 the terminal moves away from the base station 2 to the range of the base station 3, enters the coverage of the paging group 2, and triggers a location update process of the paging group;
  • the terminal moves to the range of the base station 3
  • downlink synchronization is performed and the DCD message of the base station 3 is received.
  • the paging group identifier (PGIDs) of the paging group 1 is not found in the DCD message, only the identifier of the paging group 2 indicates that the terminal has left the paging group 1, and the movement of the paging group has occurred.
  • the location update process across the paging group will be triggered again.
  • the location update process is in line with the existing standard In this process, the original paging message can be used.
  • the Anchor paging controller updates the paging group and paging parameters of the terminal to the paging parameters of paging group 2 and paging group 2, and deletes the search parameters.
  • the information of group 1 is not described here.
  • the access gateway After the location update initiated by the terminal under the base station 2 is successful, and before the location update of the cross-paging group initiated under the base station 3 is successful, after the access gateway receives the data addressing the terminal, it will notify through an internal message.
  • the Anchor paging controller of the terminal initiates a paging procedure, and the Anchor paging controller sends a paging to the base stations in the two paging groups according to the paging group 2 and the paging group 1 identifier recorded in the terminal location information. Message, since the terminal still belongs to paging group 1, the Anchor paging controller will still use the paging group 1 paging parameter to send the paging message.
  • the terminal On the terminal side, since the terminal moves to the coverage of the base station 1, the location update initiated by the terminal does not change the paging group to which it belongs. Therefore, before the location update across the paging group is successful, the terminal still listens to the paging message under base station 2 or base station 3 according to the paging parameter of paging group 1. Thus, even if the terminal has entered the range of the base station 3, the terminal can be successfully paged, thereby improving the success rate of paging.
  • the transmission of a paging message may be performed in a single step or in multiple steps.
  • the paging controller sends a paging message to all base stations in the recorded paging group at a time.
  • the paging controller sends a paging message to the base station in the recorded paging group multiple times, and after receiving the paging message of the paging controller, the base station sends the paging parameter according to the paging parameter indicated by the paging controller.
  • Air interface paging message In this process, if the paging controller is able to receive the paging access message of the terminal, the transmission of the subsequent paging message will be stopped.
  • the terminal suspends the idle mode and starts the paging access procedure.
  • Step S306 after the location update of the paging group is successful, when the Anchor paging controller needs to page the terminal, the paging message of the paging group 2 is sent to the base station in the paging group 2 to initiate a paging message.
  • the terminal listens to the paging message under the base station 3 according to the paging group 2 paging parameter.
  • Embodiment 2 Referring to FIG. 4, in this embodiment, after the base station initiates a location update on the paging group boundary, the base station reports the neighboring cell identity (the neighboring cell BSIDs), and when the Anchor paging controller needs to page the terminal, the base station is located at the terminal. And the neighboring base station initiates paging.
  • the neighboring cell identity the neighboring cell BSIDs
  • Step S401 The terminal enters an idle mode under the base station 1, selects the base station 1 as a preferred base station of the terminal, and the terminal can perform downlink synchronization and receive a DCD message in a range covered by the base station 1, and the paging controller specifies that the terminal currently belongs to the paging group 1 And specify the corresponding paging parameter,
  • Step S402 when the terminal moves to the coverage of the base station 2, and listens to the downlink broadcast message, if it is determined to enter the overlapping area of the two paging groups, the terminal initiates a location update procedure to the base station 2, and the base station 2 reports the neighbor base station information to the terminal.
  • Anchor paging controller
  • the terminal can judge that the overlapping area of the two paging groups is entered by the paging group identifier in the DCD message. This triggers the location update process.
  • the base station 2 When the terminal is updated, the base station 2 sends an R6 interface location update request message to the Anchor paging controller, and the R6 interface location update request message is as shown in Table 3.
  • a parameter is added, that is, the neighbor base station identity BSIDs of the base station where the terminal performs location update, where is the identity of the base station 1 and the base station 3.
  • the identity of base station 2 has been defined in the message.
  • Paging paging information include: Information PAGING—CYCLE,
  • the base station can recommend values for terminal Paging Cycle and Paging Offset.
  • Network Exit This parameter indicates that the terminal is available when the parameter is used for the shutdown position Indicator.
  • the base station 2 may also send a location update request message to the Anchor paging controller through the relay paging controller, including the R4 interface location update request message and the R6. Interface location update request message.
  • the contents of the R6 interface location update request message are shown in Table 3.
  • the contents of the R4 interface location update request message are shown in Table 4. It also increases the neighbor base station identity BSIDs of the base station where the terminal performs location update.
  • BS ID Base station identification Required Indicates the base station identity where the terminal performs location update.
  • Neighbor BSIDs Neighboring base station identifier Optional Terminal performs location update.
  • Paging paging information include: Information PAGING—CYCLE,
  • the base station can be to the terminal
  • Paging Offset proposes a suggested value
  • This parameter indicates that the terminal is optional. This parameter is used for the shutdown position Indicator is in the shutdown update
  • the location update request message of the R6 and R4 interfaces may not increase the neighbor BSIDs parameter.
  • the Anchor paging controller or the intermediate paging controller needs to record the topology relationship of the base station.
  • the anchor paging controller or the intermediate paging controller can find the neighboring base station according to the base station 2 that reports the location update message, and the Anchor paging controller can add the neighboring base station identifier to the terminal location information accordingly.
  • the neighbor base station identity needs to be notified to the Anchor paging controller.
  • Step S403 after receiving the location update request message, the Anchor paging controller adds the identifier of the base station 2 and its neighboring base station to the terminal location information, the paging group and the paging parameter to which the terminal belongs are unchanged, and then directly or through the medium. Following the paging controller, feeding back a location update response message to the base station 2;
  • the location information of the terminal may include paging group information of the location where the terminal is located, the base station where the terminal is located, and neighboring area information thereof.
  • Step S404 after receiving the location update response message, the base station 2 feeds back the location update confirmation message to the Anchor paging controller directly or through the relay paging controller, and feeds back the result of the location update to the terminal through the ranging response message of the air interface;
  • Step S405 the terminal moves away from the base station 2 to the range of the base station 3, enters the coverage of the paging group 2, and triggers a location update process of the paging group;
  • the terminal can also judge according to the paging group identifier (PGIDs) in the DCD message of the base station 3. A move across the paging group was born.
  • the location update process of the cross-paging group may be the same as the existing standard.
  • the Anchor paging controller may update the paging group and paging parameters of the terminal to the paging group 2 and paging group 2. Call parameters. It is also possible to simultaneously update the identifier of the base station where the terminal is located and the base station of the neighboring cell in the terminal location information.
  • the terminal After the location update initiated by the terminal under the base station 2 is successful, and before the location update of the cross-page group under the base station 3 is successful, after the access gateway receives the data addressing the terminal, the terminal will notify the terminal through an internal message.
  • the Anchor paging controller initiates a paging procedure, and the Anchor paging controller will adopt the paging parameter of the paging group 1, and at least need to initiate a paging message to the base station where the terminal is located and its neighboring base station.
  • the terminal still listens for paging messages under base station 2 or base station 3 according to the paging parameters of paging group 1. Thus, even if the terminal has entered the range of the base station 3, the terminal can be successfully paged, thereby improving the success rate of paging.
  • the above processing corresponds to the temporary extension of the base station included in the paging group 1 for the terminal, and the base station 3 is added to the range of the paging group 1. This will successfully page to the terminal.
  • the single-step or multi-step mode may also be adopted.
  • the single-step mode is adopted, paging is required to be sent to all base stations and base stations 3 in the paging group 1.
  • the multi-step mode is adopted, the first step may be adopted. A paging is initiated to the base station where the terminal is located and its neighboring base station.
  • Step S406 after the location update of the paging group succeeds, when the Anchor paging controller needs to page the terminal, the paging parameter of the paging group 2 is used to initiate paging to the base station in the paging group 2, and The terminal listens to the paging message under the base station 3 according to the paging parameter of the paging group 2.
  • the invention performs the location update on the network side by judging the location of the terminal in advance, and triggers the update process when the terminal is in the overlapping area of the paging group, and performs location update, thereby greatly improving the paging success rate of the terminal, and simultaneously improving the paging success rate of the terminal.
  • the paging range reliability is also guaranteed.

Description

宽带无线通信系统中提高寻呼成功率的方法
技术领域
本发明涉及一种移动通信技术， 具体说， 涉及一种宽带无线通信系统中 提高寻呼成功率的方法。 背景技术
微波存取全球互通 ( WiMAX, Worldwide Interoperability for Microwave Access)是新一代的宽带无线通信技术，相比于传统的 3G接入技术， WiMAX 在高速率、服务质量（ Quality of Service, QoS )灵活性方面具有一定的优势。
如图 1所示， 是 WiMAX系统的基本网络结构图， 包括基站（BS )、 接 入网关 （AGW )、 鉴权者功能模块 （ Authenticator )、 寻呼控制器 （Paging Controller ), 鉴权授权计费模块（AAA )等功能模块。 其中， 寻呼控制器和 鉴权者功能模块一般位于接入网关， 寻呼控制器按照功能可以分为锚定 ( Anchor )寻呼控制器和中继寻呼控制器。 其中， 基站和接入网关或者寻呼 控制器之间为 R6接口， 中继寻呼控制器和 Anchor寻呼控制器之间为 R4接 ρ。 空闲 （Idle )模式是 iMAX系统中一种很重要的省电模式， 当终端处 于空闲模式时， 由于终端可以在非监听时隙休眠， 因此可以大大增加移动终 端的续航能力。 终端在空闲模式下通过各种位置更新机制向寻呼控制器 ( Paging Controller )上4艮当前所属的寻呼组信息，常用的位置更新机制主要 包括周期位置更新以及寻呼组位置更新，处于空闲模式下的终端在每次监听 间隔中需要首先进行下行同步，在下行同步过程中， 终端需要搜索下行信道 描述（DCD ) 消息， 根据 WiMAX协议描述， 如果 DCD消息中的寻呼组列 表不包括终端当前所属的寻呼组， 终端将认为自己发生了跨寻呼组的移动， 将触发位置更新流程向寻呼控制器通报最新的寻呼组位置信息。当有寻址到 终端的下行数据发送到接入网关后， 接入网关通知 Anchor寻呼控制器进行 寻呼， Anchor寻呼控制器通过中继寻呼控制器可以通知终端所在寻呼组内 的所有或者部分基站向终端发送寻呼广播消息， 通知终端退出空闲模式后， 接收数据。
WiMAX论坛下属的网络工作组（ NWG )在阶段三的标准中详细规定了 终端进入空闲模式，寻呼以及退出空闲模式的流程。根据 WiMAX协议描述， 对于处于移动状态下的终端，寻呼控制器可以根据位置更新上报的终端所属 的寻呼组信息发起寻呼。
如图 2所示，是 WiMAX系统空闲模式下终端移动示意图。寻呼控制器 管理基站 1、 基站 2和基站 3， 其中， 基站 1属于寻呼组 1 , 基站 3属于寻 呼组 2，基站 2同时属于寻呼组 1和寻呼组 2。 终端在基站 1进入空闲模式， 选择寻呼组 1做为自己当前的寻呼组，当终端从基站 1的小区覆盖范围移动 到基站 2的小区覆盖范围时， 由于基站 2仍然属于寻呼组 1， 因此不会进行 寻呼区更新触发方式的位置更新；当终端从基站 2的小区覆盖范围快速移动 到基站 3的小区覆盖范围时， 终端在新的基站 3下需要首先进行下行同步， 接收 DCD消息， 检测到自己已经发生了跨寻呼组的移动， 并且依此发起位 置更新流程。如果在终端成功进行新的位置更新流程之前，发生了对终端的 寻呼，终端将会出现首次寻呼失败， 寻呼控制器只能通过后续的寻呼重传消 息来寻呼终端。在最严重的情况下，如果寻呼控制器没有能够在寻呼次数耗 尽之前接收到来自终端的位置更新消息， 寻呼终端将出现失败。 发明内容
本发明所要解决的技术问题是提供一种宽带无线通信系统中提高寻呼 成功率的方法， 提高了终端的寻呼成功率。
为了解决上述技术问题，本发明提供了一种宽带无线通信系统中提高寻 呼成功率的方法， 包括以下步骤： 终端判断已移入包含原寻呼组的多个寻呼 组的重叠区域时，向当前服务基站发起位置更新流程；在该位置更新流程中， 锚定寻呼控制器更新所述终端的位置信息，将当前服务基站及其相邻基站包 含在寻呼范围之内；在重叠区域发起的所述位置更新成功之后和跨寻呼组的 位置更新成功之前， 所述终端按原寻呼组的寻呼参数监听寻呼消息， 所述锚 定寻呼控制器需寻呼所述终端时，按原寻呼组的寻呼参数向包含当前服务基 站及其邻区基站的多个基站发起寻呼。 进一步地， 上述方法还可具有以下特点：
在所述重叠区域发起的位置更新流程中，锚定寻呼控制器在所述终端的 位置信息中增加所述多个寻呼组中除原寻呼组外的其它寻呼组信息；在重叠 区域发起的所述位置更新成功之后和跨寻呼组的位置更新成功之前，所述锚 定寻呼控制器需寻呼所述终端时，按原寻呼组的寻呼参数向所述多个寻呼组 内的基站发起寻呼。
进一步地， 上述方法还可具有以下特点：
在所述重叠区域发起的位置更新流程中 ,锚定寻呼控制器在所述终端的 位置信息中增加用于标识所述终端当前服务基站及其邻区基站的信息；在重 叠区域发起的所述位置更新成功之后和跨寻呼组的位置更新成功之前，所述 锚定寻呼控制器需寻呼所述终端时，按原寻呼组的寻呼参数向原寻呼组内的 基站以及所述邻区基站发起寻呼。
进一步地， 上述方法还可具有以下特点：
( a )终端从属于寻呼组 A的基站 BSA移动到另一基站 BSAB的范围， 如根据监听到的当前服务基站 BSAB的下行广播消息判断目前处于原寻呼组 A和包含一个或多个新寻呼组的寻呼组集合 B的重叠区域，则触发位置更新 流程；
( b )在所述位置更新流程中 , 基站 BSAB向所述终端的锚定寻呼控制器 发送位置更新请求消息， 所述锚定寻呼控制器收到后， 在所述终端的位置信 息中增加寻呼组集合 B包含的寻呼组信息， 同时保留寻呼组 A的标识及其 寻呼参数；
( c )在重叠区域发起的所述位置更新成功之后和所述终端发起跨寻呼 组的位置更新并成功之前， 所述终端仍按寻呼组 A的寻呼参数监听寻呼消 息， 所述锚定寻呼控制器需寻呼所述终端时， 按寻呼组 A的寻呼参数向所 述终端位置信息中记录的寻呼组 A的基站以及寻呼组集合 B包含的寻呼组 内的基站发起寻呼。 进一步地， 上述方法还可具有以下特点：
步骤（b )基站 BSAB发送的位置更新请求消息中增加了一个寻呼组标识 PGIDs的参数，该参数中至少包括寻呼组集合 B中包含的寻呼组的标识，所 述锚定寻呼控制器收到后， 将寻呼组集合 B 中包含的寻呼组的标识加入到 所述终端的位置信息中； 或者
步骤（b )基站 BSAB发送的位置更新请求消息不包含寻呼组 B的标识， 所述锚定寻呼控制器根据基站所属寻呼组的信息判断基站 BSAB同时属于原 寻呼组 A和所述寻呼组集合 B时，或者在基站 BSAB和所述锚定寻呼控制器 间传递消息的中间寻呼控制器完成对基站 BSAB所属寻呼组的判断并通知所 述锚定寻呼控制器， 所述描定寻呼控制器将所述寻呼组集合 B 中包含的寻 呼组的标识加入到所述终端的位置信息中。
进一步地， 上述方法还可具有以下特点：
( a )终端从属于寻呼组 A的基站 BSA移动到另一基站 BSAB的范围， 如根据监听到的当前服务基站 BSAB的下行广播消息判断目前处于包含原寻 呼组 A的多个寻呼组的重叠区域， 则触发位置更新流程；
( b )在所述位置更新流程中，基站 BSAB向所述终端的锚定寻呼控制器 发送位置更新请求消息， 所述锚定寻呼控制器收到后， 在所述终端的位置信 息中增加基站 BSAB及其邻区基站的信息， 同时保留寻呼组 A的标识及其寻 呼参数；
( c )在重叠区域发起的所述位置更新成功之后和所述终端发起跨寻呼 组的位置更新并成功之前， 所述终端仍按寻呼组 A的寻呼参数监听寻呼消 息， 所述锚定寻呼控制器需寻呼所述终端时， 按寻呼组 A的寻呼参数向寻 呼组 A内的基站以及基站 BSAB的邻区基站发起寻呼。
进一步地， 上述方法还可具有以下特点：
步骤（b )基站 BSAB发送的位置更新请求消息中增加了一个邻区基站标 识 BSIDs的参数， 该参数中至少包括基站 BSAB的邻区基站标识， 所述锚定 寻呼控制器收到后，将所述邻区基站标识加入到所述终端的位置信息中； 或 者 步骤（b )基站 BSAB发送的位置更新请求消息不包含基站 BSAB的邻区 基站标识， 所述锚定寻呼控制器根据基站拓朴关系查找基站 BSAB的邻区基 站标识时， 或者在基站 BSAB和所述锚定寻呼控制器间传递消息的中间寻呼 控制器查找到基站 BSAB的邻区基站标识并通知所述锚定寻呼控制器， 所述 描定寻呼控制器将基站 BSAB及其邻区基站标识加入到所述终端的位置信息 中。
进一步地， 上述方法还可具有以下特点：
所述终端移动进入另一基站的范围后，监听当前服务基站的下行广播消 息，如判断所述下行广播消息的寻呼组列表中出现了包含原寻呼组的多个寻 呼组的标识， 则判断目前处于包含寻呼组 A的多个寻呼组的重叠区域， 则 主动触发位置更新流程。
进一步地， 上述方法还可具有以下特点：
所述终端从所述重叠区域移动到不属于原寻呼组的基站的范围后，发起 跨寻呼组的位置更新流程，在该位置更新流程中， 所述锚定寻呼控制器将所 述终端的寻呼组和寻呼参数更新为当前服务基站所属的寻呼组及其寻呼参 数； 在位置更新成功后， 所述终端按照所述新的寻呼组的寻呼参数监听寻呼 消息， 所述锚定寻呼控制器寻呼所述终端时，按所述新的寻呼组的寻呼参数 向所述新的寻呼组内的基站发起寻呼。
进一步地， 上述方法还可具有以下特点：
所述锚定寻呼控制器寻呼所述终端时，寻呼消息的发送采用一次寻呼范 围内部分基站的单步方式进行，或者采用一次寻呼范围内所有基站的多步方 式进行。
进一步地， 上述方法还可具有以下特点： 所述终端在重叠区域触发的位 置更新流程分为以下步骤：
所述终端向当前服务基站发送测距消息， 触发位置更新流程； 所述当前服务基站收到所述测距消息后，直接或通过中继寻呼控制器向 所述锚定寻呼控制器发送位置更新请求消息； 所述锚定寻呼控制器收到所述位置更新请求消息后，直接或通过中继寻 呼控制器向所述当前服务基站返回位置更新响应消息，并更新寻呼所述终端 的位置信息，将当前服务基站及其相邻基站包含在内， 同时保留终端所在原 寻呼组的标识及其寻呼参数；
所述当前服务基站收到所述位置更新响应消息后，向所述锚定寻呼控制 器反馈位置更新确认消息， 并通过测距响应消息向终端反馈位置更新的结 果。
进一步地， 上述方法还可具有以下特点： 该方法应用于微波存取全球互 通 WiMAX系统。
本发明技术方案中， 通过尽可能预先判断出终端所处的位置， 当终端处 在寻呼组的重叠区域就触发更新流程，进行位置更新， 保证了网络侧的寻呼 参数得到及时的更新，从而大大提高了终端的寻呼成功率， 同时还保证了寻 呼范围可靠性， 避免在过大范围内进行寻呼所导致的寻呼广播风暴。 附图概述
图 1是现有技术中 WiMAX系统的基本网络结构图；
图 2是现有技术中 WiMAX系统空闲模式下终端移动示意图；
图 3是本发明优选实施例一的流程图；
图 4是本发明优选实施例二的流程图。
本发明的较佳实施方式
参照图 3和图 4， 并结合图 2所示场景， 对本发明优选实施例做详细描 述。 处于空闲模式下的终端从基站 1的覆盖范围逐步移动到基站 2的覆盖范 围 （属于寻呼组 1和寻呼组 2的重叠区域， 或者说寻呼组 1的边界区域） ， 再从基站 2的覆盖范围移动到基站 3的覆盖范围。 为了提高寻呼的成功率， 尽可能预先判断出终端可能的位置，在不影响位置更新流程和寻呼流程的前 提下实现寻呼。
本发明所提出的宽带无线通信系统中提高寻呼成功率的方法包括两个 优选实施例。
实施例一
参照图 3所示， 本实施例中， 利用寻呼组标识（PGIDs )来判断终端当 前所处的位置， 并进行相应的位置更新。
步骤 S301 , 终端在基站 1 所覆盖的范围内进入空闲模式， 选择基站 1 作为该终端的当前服务基站（Server BS )， 进行下行同步并接收 DCD消息； 寻呼控制器指定终端当前属于寻呼组 1 , 并且指定对应的寻呼参数， 该寻呼 参数至少包括寻呼周期（ PAGING_CYCLE )、寻呼偏置（ PAGING OFFSET ) 和寻呼间隔长度；
在基站 1 下， 由于终端在 DCD消息中只发现寻呼组 1 的寻呼组标识 ( PGIDs ) , 所以终端不触发位置更新流程。
步骤 S302, 当终端移动到基站 2的覆盖范围， 监听下行广播消息， 如 判断进入两个寻呼组的重叠区域， 终端向基站 2发起位置更新流程， 基站 2 将寻呼组 2信息上报到终端的锚定（Anchor )寻呼控制器；
终端移动到基站 2的覆盖范围后， 会将服务 BS设置为基站 2, 在寻呼 监听间隔醒来监听下行广播消息。在开始监听前， 终端首先需要进行下行同 步并接收 DCD消息， 如果在 DCD消息的寻呼组列表中出现了寻呼组 1的 PGIDs和其它寻呼组的 PGIDs, 由于寻呼组 2的寻呼组标识（PGIDs ) 不属 于该终端当前所属的寻呼组 1， 终端认为自己到了寻呼区边界， 即终端处于 寻呼组 1和寻呼组 2的重叠区域。 当然，基站也可以从其它下行广播消息得 到基站 2所属寻呼组的信息，比如 MOB-NBR-ADV或者 MOB-PAG-ADV消 息。
终端此时可以主动触发位置更新流程。 或者， 终端此时也可以通过位置 更新定时器周期触发位置更新流程（推荐采用前一种方式）。 终端可以通过 测距消息触发位置更新。 基站 2收到测距消息后， 向终端所属的 Anchor寻呼控制器发送位置更 新请求消息 （R6接口位置更新请求消息） ， 该位置更新请求消息包含了寻 呼组 2的信息 （包括寻呼组 2的 PGIDs ) ， 本实施例釆用的 R6接口位置更 新请求消息如表 1所示。在原位置更新请求中增加了一个参数 "PGIDs" (寻 呼组标识） ， 用于指示终端当前所在的寻呼组， 由于该消息中原有参数 "Paging Information"可以指示寻呼组 1的信息， 因此在新增参数 "PGIDs" 中可以只包括寻呼组 2标识， 即可以不包括终端所在的寻呼组， 当然也可以 同时包括寻呼组 1和寻呼组 2的标识。
R6接口位置更新请求消息
Figure imgf000010_0001
参数 描述 必选 /可选 说明
Offset提出建议值
Network Exit 该参数指示终端当前 可选 该参数用于关机位置 Indicator 正在关机 更新
如果基站 2和 Anchor寻呼控制器之间没有直接的物理链路相连， 基站 2需通过中继寻呼控制器向 Anchor寻呼控制器发送位置更新请求消息， 包 括 R4接口位置更新请求消息和 R6接口位置更新请求消息。 其中， R6接口 位置更新请求消息的内容如表 1所示， R4接口位置更新请求消息的内容如 表 2所示。 也在位置更新请求中增加了一个参数 "PGIDs" , 包括寻呼组 2 标识， 当然还可以包括寻呼组 1的标识。
R4接口位置更新请求消息
Figure imgf000011_0001
需要说明的是， 上述 R6和 R4接口的位置更新请求消息中也可以不增 加 PGIDs这个参数， 此时， Anchor寻呼控制器或中间寻呼控制器需要记录 基站和寻呼组之间的对应关系， 这样， Anchor寻呼控制器或中间寻呼控制 器根据上报位置更新消息的基站 2即可查找得到其所属的寻呼组，即寻呼组 1 和寻呼组 2， 即可判断终端移动到了寻呼组 1 和寻呼组 2的重叠区域， Anchor寻呼控制器可以据此将寻呼组 2的寻呼组标识 PGID加入到该终端位 置信息中的寻呼组信息中。这里，如果是中间寻呼控制器判断出的则需将寻 呼组 2信息如寻呼组 2的标识通知 Anchor寻呼控制器
步骤 S303， Anchor寻呼控制器接收到位置更新请求消息后， 根据位置 更新请求消息 PGISs参数中的寻呼组 2标识加入到所述终端位置信息中的寻 呼组信息中，终端所属寻呼组和寻呼参数不变， 然后直接或通过中继寻呼控 制器向基站 2反馈位置更新响应消息；
终端移动到基站 2的覆盖范围下时， 由于终端并没有离开寻呼组 1 , 此 时网络侧的位置更新并不改变终端当前归属于寻呼组 1， 只是在终端的位置 信息中增加了寻呼组 2标识来进行辅助定位， 终端还是属于寻呼组 1， 终端 的寻呼参数没有改变。如果位置更新失败， 寻呼控制器除返回失败的位置更 新响应外不做任何处理， 等待下一次的位置更新流程。
步骤 S304, 基站 2接收到位置更新响应消息后， 直接或通过中继寻呼 控制器向 Anchor寻呼控制器反馈位置更新确认消息， 并通过空口的测距响 应消息向终端反馈位置更新的结果；
步骤 S305, 终端离开基站 2移动到基站 3的范围， 进入到寻呼组 2的 覆盖范围， 触发跨寻呼组的位置更新流程；
终端移动到基站 3的范围后，进行下行同步并接收基站 3的 DCD消息。 如果在该 DCD消息中没有发现寻呼组 1的寻呼组标识（PGIDs ) ， 只有寻 呼组 2的标识，说明终端离开了离开寻呼组 1， 已经发生了跨寻呼组的移动， 终端将再次触发跨寻呼组的位置更新流程。 该位置更新流程与现有标准一 样， 可以釆用原有的标准消息， 在该流程中， Anchor寻呼控制器将终端所 在寻呼组和寻呼参数更新为寻呼组 2和寻呼组 2的寻呼参数，同时删除寻呼 组 1的信息， 具体过程在此就不再赘述。
在终端在基站 2下发起的位置更新成功之后，以及在基站 3下发起的跨 寻呼组的位置更新成功之前， 当接入网关接收到寻址所述终端的数据后，将 通过内部消息通知终端的 Anchor寻呼控制器发起寻呼流程， Anchor寻呼 控制器将根据该终端位置信息中记录的寻呼组 2和寻呼组 1标识，分别向两 个寻呼组内的基站发送寻呼消息， 由于终端仍然属于寻呼组 1， Anchor寻呼 控制器将仍然采用寻呼组 1寻呼参数进行寻呼消息的发送。 终端方面， 由于 终端移到基站 1的覆盖范围后，终端发起的位置更新并没有更改自己归属的 寻呼组。 因此在跨寻呼组的位置更新成功之前， 终端仍然按寻呼组 1的寻呼 参数在基站 2或基站 3下监听寻呼消息。这样， 即使终端已进入基站 3的范 围， 也可以成功地寻呼到该终端， 从而提高了寻呼的成功率。
特别地， 寻呼消息（可以是广播消息）的发送可以采用单步或者多步的 方式进行。单步发送时， 寻呼控制器一次向所记录寻呼组内的所有基站发送 寻呼消息。 多步发送时， 寻呼控制器分多次向所记录寻呼组中的基站发送寻 呼消息，基站在接收到寻呼控制器的寻呼消息后根据寻呼控制器指示的寻呼 参数发送空口的寻呼消息。在此过程中，如果寻呼控制器能够接收到终端的 寻呼接入消息， 将停止后续寻呼消息的发送。
如果寻呼广播消息中指示有寻呼到自己的信息， 终端中止空闲模式， 开 始寻呼接入流程。
步骤 S306, 在跨寻呼组的位置更新成功之后， Anchor寻呼控制器需寻 呼所述终端时 ,将按寻呼组 2的寻呼参数向寻呼组 2内的基站发起寻呼消息， 而终端则按寻呼组 2寻呼参数在基站 3下监听寻呼消息。
此时的处理与现有标准是一致的， 不再赘述。
实施例二 参照图 4所示， 本实施例中， 基站在寻呼组边界发起位置更新后， 基站 上报邻区基站标识（邻区 BSIDs ) , Anchor寻呼控制器需寻呼终端时， 向该 终端所在基站和邻区基站发起寻呼。
步骤 S401 , 终端在基站 1下进入空闲模式， 选择基站 1作为终端的优 选基站， 终端能够在基站 1所覆盖的范围进行下行同步并接收 DCD消息， 寻呼控制器指定终端当前属于寻呼组 1， 并且指定对应的寻呼参数，
步骤 S402, 当终端移动到基站 2的覆盖范围， 监听下行广播消息， 如 判断进入两个寻呼组的重叠区域， 终端向基站 2发起位置更新流程， 基站 2 将邻区基站信息上报到终端的锚定（ Anchor )寻呼控制器；
同样地， 终端可以通过 DCD消息中的寻呼组标识判断进入了两个寻呼 组的重叠区域。 从而触发位置更新流程。
在对终端进行位置更新时，基站 2向 Anchor寻呼控制器发送 R6接口位 置更新请求消息， R6接口位置更新请求消息如表 3所示。 在该表中增加了 一个参数即终端执行位置更新所在的基站的邻区基站标识 BSIDs,在此处是 基站 1和基站 3的标识。 消息中已定义了基站 2的标识。
R6接口位置更新请求消息
Figure imgf000014_0001
参数 描述 必选 /可选 说明
Relocation 寻呼控制器 Anchor寻呼控制器标 Destination 识
Paging 寻呼信息 可选 该寻呼参数包括： Information PAGING— CYCLE,
PAGING OFFSET, 以 及 Paging Group ID. 基 站可以对终端 Paging Cycle以及 Paging Offset提出建议值
Network Exit 该参数指示终端当 可选 该参数用于关机位置 Indicator 前正在关机 更新
如果基站 2和 Anchor寻呼控制之间没有直接的物理链路相连， 基站 2 还可以通过中继寻呼控制器向 Anchor寻呼控制器发送位置更新请求消息， 包括 R4接口位置更新请求消息和 R6接口位置更新请求消息。 R6接口位置 更新请求消息的内容如表 3所示， R4接口位置更新请求消息的内容如表 4 所示。 也是增加了终端执行位置更新所在的基站的邻区基站标识 BSIDs。
R4接口位置更新请求消息
参数 描述 必选 /可选 说明
BS ID 基站标识 必选 指示终端执行位置更 新所在的基站标识 邻区 BSIDs 邻区基站标识 可选 终端执行位置更新所 在基站的邻区基站标
Anchor PC 请求更新的 Anchor寻 可选 需要进行重定位的 Relocation 呼控制器 Anchor寻呼控制器标 Destination 识
Paging 寻呼信息 可选 该寻呼参数包括： Information PAGING— CYCLE,
PAGING OFFSET, 以 及 Paging Group ID. 参数 描述 必选 /可选 说明
基站可以对终端的
Paging Cycle以及
Paging Offset提出建 议值
Network Exit 该参数指示终端 前正 可选 该参数用于关机位置 Indicator 在关机 更新
需要说明的是， 上述 R6和 R4接口的位置更新请求消息中也可以不增 加邻区 BSIDs这个参数， 此时， Anchor寻呼控制器或中间寻呼控制器需要 记录基站的拓朴关系。 这样， Anchor寻呼控制器或中间寻呼控制器根据上 报位置更新消息的基站 2即可查找得到其邻区基站， Anchor寻呼控制器可 以据此将该邻区基站标识加入到该终端位置信息中。这里， 如果是中间寻呼 控制器查找到的， 则需将邻区基站标识通知 Anchor寻呼控制器。
步骤 S403， Anchor寻呼控制器接收到位置更新请求消息后， 将基站 2 及其邻区基站的标识加入到终端位置信息中，终端所属寻呼组和寻呼参数不 变， 然后直接或通过中继寻呼控制器向基站 2反馈位置更新响应消息；
终端移动到基站 2的覆盖范围下时， 由于终端并没有离开寻呼组 1， 此 时网络侧的位置更新并不改变终端当前归属的寻呼组，只是在终端的位置信 息中增加了基站 2及其邻区基站标识来进行辅助定位，终端还是属于寻呼组 1， 终端的寻呼参数没有改变。 终端的位置信息可以包括终端所在位置的寻 呼组信息、 终端所在位置的基站及其邻区信息等等。
步骤 S404, 基站 2接收到位置更新响应消息后， 直接或通过中继寻呼 控制器向 Anchor寻呼控制器反馈位置更新确认消息， 并通过空口的测距响 应消息向终端反馈位置更新的结果；
步骤 S405, 终端离开基站 2移动到基站 3的范围， 进入到寻呼组 2的 覆盖范围， 触发跨寻呼组的位置更新流程；
终端同样可根据基站 3的 DCD消息中的寻呼组标识（PGIDs )判断发 生了跨寻呼组的移动。该跨寻呼组的位置更新流程可以与现有标准一样，在 该流程中， Anchor寻呼控制器可以将终端所在寻呼组和寻呼参数更新为寻 呼组 2和寻呼组 2的寻呼参数。也可以同时更新终端位置信息中终端所在基 站及其邻区基站的标识。
在终端在基站 2下发起的位置更新成功之后，以及在基站 3下的跨寻呼 组的位置更新成功之前， 当接入网关接收到寻址所述终端的数据后，将通过 内部消息通知终端的 Anchor寻呼控制器发起寻呼流程， Anchor寻呼控制 器将采用寻呼组 1的寻呼参数，至少需向该终端所在基站及其邻区基站发起 寻呼消息。而终端仍按寻呼组 1的寻呼参数在基站 2或基站 3下监听寻呼消 息。 这样， 即使终端已进入基站 3的范围， 也可以成功地寻呼到该终端， 从 而提高了寻呼的成功率。
以上的处理相当于针对所述终端，将寻呼组 1所包含的基站进行了临时 扩展， 将基站 3加入寻呼组 1的范围。 这样就可以成功地寻呼到该终端。 在 寻呼时， 也可以采用上述单步或多步的方式， 采用单步方式时， 需向寻呼组 1内所有基站以及基站 3发起寻呼， 采用多步方式时， 可以在第一步向终端 所在基站及其邻区基站发起寻呼。
步骤 S406, 在跨寻呼组的位置更新成功之后， Anchor寻呼控制器需寻 呼所述终端时，将按寻呼组 2的寻呼参数向寻呼组 2内的基站发起寻呼， 而 终端按寻呼组 2的寻呼参数在基站 3下监听寻呼消息。
工业实用性
本发明通过提前判断出终端所处的位置来进行网络侧的位置更新，当终 端处在寻呼组的重叠区域就触发更新流程， 进行位置更新，从而大大提高了 终端的寻呼成功率， 同时还保证了寻呼范围可靠性。

Claims

权 利 要 求 书
1、 一种宽带无线通信系统中提高寻呼成功率的方法， 包括以下步骤： 终端判断已移入包含原寻呼组的多个寻呼组的重叠区域时，向当前服务基站 发起位置更新流程； 在该位置更新流程中，锚定寻呼控制器更新所述终端的 位置信息，将当前服务基站及其相邻基站包含在寻呼范围之内； 在重叠区域 发起的所述位置更新成功之后和跨寻呼组的位置更新成功之前，所述终端按 原寻呼组的寻呼参数监听寻呼消息， 所述锚定寻呼控制器需寻呼所述终端 时，按原寻呼组的寻呼参数向包含当前服务基站及其邻区基站的多个基站发 起寻呼。
2、 根据权利要求 1所述的方法， 其特征在于：
在所述重叠区域发起的位置更新流程中 ,锚定寻呼控制器在所述终端的 位置信息中增加所述多个寻呼组中除原寻呼组外的其它寻呼组信息；在重叠 区域发起的所述位置更新成功之后和跨寻呼组的位置更新成功之前，所述锚 定寻呼控制器需寻呼所述终端时，按原寻呼组的寻呼参数向所述多个寻呼组 内的基站发起寻呼。
3、 根据权利要求 1所述的方法， 其特征在于：
在所述重叠区域发起的位置更新流程中，锚定寻呼控制器在所述终端的 位置信息中增加用于标识所述终端当前服务基站及其邻区基站的信息；在重 叠区域发起的所述位置更新成功之后和跨寻呼组的位置更新成功之前，所述 锚定寻呼控制器需寻呼所述终端时，按原寻呼组的寻呼参数向原寻呼组内的 基站以及所述邻区基站发起寻呼。
4、 根据权利要求 2所述的方法， 其特征在于， 该方法分为以下步骤：
( a )终端从属于寻呼组 A的基站 BSA移动到另一基站 BSAB的范围， 如根据监听到的当前服务基站 BSAB的下行广播消息判断目前处于原寻呼组 A和包含一个或多个新寻呼组的寻呼组集合 B的重叠区域，则触发位置更新 流程；
( b )在所述位置更新流程中 , 基站 BSAB向所述终端的锚定寻呼控制器 发送位置更新请求消息， 所述锚定寻呼控制器收到后，在所述终端的位置信 息中增加寻呼组集合 B包含的寻呼组信息， 同时保留寻呼组 A的标识及其 寻呼参数；
( c )在重叠区域发起的所述位置更新成功之后和所述终端发起跨寻呼 组的位置更新并成功之前， 所述终端仍按寻呼组 A的寻呼参数监听寻呼消 息， 所述锚定寻呼控制器需寻呼所述终端时， 按寻呼组 A的寻呼参数向所 述终端位置信息中记录的寻呼组 A的基站以及寻呼组集合 B包含的寻呼组 内的基站发起寻呼。
5、 根据权利要求 4所述的方法， 其特征在于：
步骤（ b )基站 BSAB发送的位置更新请求消息中增加了一个寻呼组标识
PGIDs的参数，该参数中至少包括寻呼组集合 B中包含的寻呼组的标识，所 述锚定寻呼控制器收到后， 将寻呼组集合 B 中包含的寻呼组的标识加入到 所述终端的位置信息中； 或者
步骤（b )基站 BSAB发送的位置更新请求消息不包含寻呼组 B的标识， 所述锚定寻呼控制器根据基站所属寻呼组的信息判断基站 BSAB同时属于原 寻呼组 A和所述寻呼组集合 B时，或者在基站 BSAB和所述锚定寻呼控制器 间传递消息的中间寻呼控制器完成对基站 BSAB所属寻呼组的判断并通知所 述锚定寻呼控制器， 所述描定寻呼控制器将所述寻呼组集合 B 中包含的寻 呼组的标识加入到所述终端的位置信息中。
6、 根据权利要求 3所述的方法， 其特征在于， 该方法分为以下步骤：
( a )终端从属于寻呼组 A的基站 BSA移动到另一基站 BSAB的范围， 如根据监听到的当前服务基站 BSAB的下行广播消息判断目前处于包含原寻 呼组 A的多个寻呼组的重叠区域， 则触发位置更新流程；
( b )在所述位置更新流程中，基站 BSAB向所述终端的锚定寻呼控制器 发送位置更新请求消息， 所述锚定寻呼控制器收到后，在所述终端的位置信 息中增加基站 BSAB及其邻区基站的信息， 同时保留寻呼組 A的标识及其寻 呼参数；
( c )在重叠区域发起的所述位置更新成功之后和所述终端发起跨寻呼 组的位置更新并成功之前， 所述终端仍按寻呼组 A的寻呼参数监听寻呼消 息， 所述锚定寻呼控制器需寻呼所述终端时， 按寻呼组 A的寻呼参数向寻 呼组 A内的基站以及基站 BSAB的邻区基站发起寻呼。
7、 根据权利要求 6所述的方法， 其特征在于：
步骤（b )基站 BSAB发送的位置更新请求消息中增加了一个邻区基站标 识 BSIDs的参数， 该参数中至少包括基站 BSAB的邻区基站标识， 所述锚定 寻呼控制器收到后，将所述邻区基站标识加入到所述终端的位置信息中； 或 者
步骤（b )基站 BSAB发送的位置更新请求消息不包含基站 BSAB的邻区 基站标识， 所述锚定寻呼控制器根据基站拓朴关系查找基站 BSAB的邻区基 站标识时， 或者在基站 BSAB和所述锚定寻呼控制器间传递消息的中间寻呼 控制器查找到基站 BSAB的邻区基站标识并通知所述锚定寻呼控制器， 所述 描定寻呼控制器将基站 BSAB及其邻区基站标识加入到所述终端的位置信息 中。
8、 根据权利要求 1、 2或 3中任一权利要求所述的方法， 其特征在于， 所述终端移动进入另一基站的范围后，监听当前服务基站的下行广播消 息，如判断所述下行广播消息的寻呼組列表中出现了包含原寻呼组的多个寻 呼组的标识， 则判断目前处于包含寻呼组 A的多个寻呼组的重叠区域， 则 主动触发位置更新流程。
9、 根据权利要求 1、 2或 3所述的方法， 其特征在于，
所述终端从所述重叠区域移动到不属于原寻呼组的基站的范围后，发起 跨寻呼组的位置更新流程，在该位置更新流程中， 所述锚定寻呼控制器将所 述终端的寻呼组和寻呼参数更新为当前服务基站所属的寻呼组及其寻呼参 数； 在位置更新成功后， 所述终端按照所述新的寻呼组的寻呼参数监听寻呼 消息， 所述锚定寻呼控制器寻呼所述终端时，按所述新的寻呼组的寻呼参数 向所述新的寻呼组内的基站发起寻呼。
10、 根据权利要求 1、 2或 3所述的方法， 其特征在于， 所述锚定寻呼控制器寻呼所述终端时，寻呼消息的发送釆用一次寻呼范 围内部分基站的单步方式进行，或者采用一次寻呼范围内所有基站的多步方 式进行。
11、 根据权利要求 4或 6所述的方法，其特征在于，所述终端在重叠区 域触发的位置更新流程分为以下步骤：
所述终端向当前服务基站发送测距消息 , 触发位置更新流程； 所述当前服务基站收到所述测距消息后，直接或通过中继寻呼控制器向 所述锚定寻呼控制器发送位置更新请求消息；
所述锚定寻呼控制器收到所述位置更新请求消息后，直接或通过中继寻 呼控制器向所述当前服务基站返回位置更新响应消息，并更新所述终端的位 置信息，将当前服务基站及其相邻基站包含在寻呼范围之内， 同时保留终端 所在原寻呼组的标识及其寻呼参数； 所述当前服务基站收到所述位置更新响应消息后，向所述锚定寻呼控制 器反馈位置更新确认消息， 并通过测距响应消息向终端反馈位置更新的结 果。
12、 根据权利要求 1、 2或 3所述的方法， 其特征在于， 该方法应用于 微波存取全球互通 WiMAX系统。
PCT/CN2007/003743 2007-12-24 2007-12-24 Procédé pour améliorer le taux de succès de recherche de mobile dans un système de communication sans fil à large bande passante WO2009079852A1 (fr)

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CN2007801005566A CN101803414B (zh) 2007-12-24 2007-12-24 宽带无线通信系统中提高寻呼成功率的方法

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