WO2006073225A2 - A method for handover between frequency allocation in broadband wireless access system - Google Patents

A method for handover between frequency allocation in broadband wireless access system Download PDF

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Publication number
WO2006073225A2
WO2006073225A2 PCT/KR2005/001723 KR2005001723W WO2006073225A2 WO 2006073225 A2 WO2006073225 A2 WO 2006073225A2 KR 2005001723 W KR2005001723 W KR 2005001723W WO 2006073225 A2 WO2006073225 A2 WO 2006073225A2
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WIPO (PCT)
Prior art keywords
handover
mobile subscriber
base station
subscriber station
control method
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2005/001723
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French (fr)
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WO2006073225A3 (en
Inventor
Yong Suk Jin
Bin Chul Im
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LG Electronics Inc
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LG Electronics Inc
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Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to EP05856317A priority Critical patent/EP1762115B1/en
Priority to JP2007527005A priority patent/JP4756043B2/en
Priority to CN2005800183872A priority patent/CN101411225B/en
Priority to US11/570,228 priority patent/US8036663B2/en
Priority to AT05856317T priority patent/ATE530043T1/en
Publication of WO2006073225A2 publication Critical patent/WO2006073225A2/en
Anticipated expiration legal-status Critical
Publication of WO2006073225A3 publication Critical patent/WO2006073225A3/en
Priority to US11/766,006 priority patent/US8855638B2/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0044—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of quality context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to a handover control method in a broadband wireless access system.
  • the present invention is particularly suitable for a base station (BS) to transmit data to a mobile subscriber station (MSS) using at least two frequency allocations (FA) .
  • BS base station
  • MSS mobile subscriber station
  • FA frequency allocations
  • FAs frequency allocations
  • FIG . 1 is a diagram of inter-frequency handover within one cell and inter-frequency handover between different cells in a broadband wireless access system supporting multiple FAs .
  • a mobile subscriber station receives data using a first frequency band FAl within one cell , it may be attempted to receive data that need a wider bandwidth such as multimedia data .
  • a resource of the first frequency band FAl is already occupied by another mobile subscriber station, it is impossible to offer a multimedia service to the corresponding mobile subscriber station via the first frequency band FAl .
  • the multimedia service may be enabled in a manner of allocating a second frequency band FA2 which is still reserved to the corresponding mobile subscriber station .
  • the inter- FA handover can be performed in two ways . Namely, a first case is that a handover 11 is carried out within one cell from the first frequency band FAl to the second frequency band FA2. And, a second case is that a handover 12 is carried out from a first frequency band FAl to a fourth frequency band FA4 in a cell using the first frequency band FAl .
  • a first case is that a handover 11 is carried out within one cell from the first frequency band FAl to the second frequency band FA2.
  • a second case is that a handover 12 is carried out from a first frequency band FAl to a fourth frequency band FA4 in a cell using the first frequency band FAl .
  • it is necessary to perform the inter-FA handover within one cell or between different cells it is necessary to perform the inter-FA handover within one cell or between different cells .
  • an inter-FA handover method has not been proposed yet in case of using the multiple FA within one cell .
  • the present invention is directed to a handover control method in a broadband wireless access system that substantially obviates one or more of the problems due to limitations and disadvantages of the related art .
  • An obj ect of the present invention is to provide a handover control method in a broadband wireless access system, in which a base station transmits data to a mobile subscriber station using at least two frequency allocations . Additional features and advantages of the invention will be set forth in the description which follows , and in part will be apparent from the description, or may be learned by practice of the invention. The obj ectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings .
  • a handover control method includes the steps of receiving from a mobile subscriber station a handover request message including an identifier of the mobile subscriber station, transmitting a handover request notification message including the identifier of the mobile subscriber station to a handover target base station, receiving a handover request notification response message including information for frequency allocation supportable by the target base station, and transmitting a handover response message including the information for the frequency allocation to the mobile subscriber station .
  • a handover control method includes the steps of transmitting to a mobile subscriber station a handover request message requesting that the handover shall be executed with a specific frequency allocation provided by the base station, receiving a handover execution indication message including information for a handover action mode from the mobile subscriber station, and performing a network reentry- procedure with the frequency allocation based on the action mode .
  • a handover control method includes the steps of transmitting to a handover target base station a handover request notification message including an identifier of a mobile subscriber station which will perform the handover, receiving from the handover target base station a handover notification response message including information for a frequency allocation supportable for the mobile subscriber station, transmitting to the handover target base station a handover confirmation message notifying that the mobile subscriber station will perform the handover with the supportable frequency allocation, and transmitting to the mobile subscriber station a handover request message requesting the handover with the frequency allocation of the handover target base station .
  • FIG . 1 is a diagram of inter-frequency handover within one cell and inter-frequency handover between different cells in a broadband wireless access system supporting multiple FAs;
  • FIG . 2 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention, in which the handover process is requested by a mobile subscriber station;
  • FAs frequency allocations
  • FIG . 3 is a flowchart of a handover process between frequency allocations (FAs) within one cell according to one embodiment of the present invention, in which the handover process is requested by a base station;
  • FAs frequency allocations
  • FIG . 4 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention, in which the handover process is requested by a base station; and
  • FIG . 5 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention .
  • FIG . 2 is a flowchart of a handover process between frequency allocations (FAs) to a different cell according to one embodiment of the present invention, in which the handover process is requested by a mobile subscriber station .
  • FAs frequency allocations
  • a serving base station supports a first FA FAl and a second FA FA2 and a target base station supports a third FA FA3 and a fourth FA FA4 , for example .
  • a base station informs the information of neighbor base stations to all mobile subscriber stations within a cell via a network topology advertisement message (MOB_NBR- ADV) for network configuration associated information (S201) .
  • Table 1 shows an example of a network topology advertisement message applicable to the present invention . [Table 1]
  • a field FA_ID indicates what kind of FA is supported by a specific neighbor base station .
  • a mobile subscriber station carries out scanning on neighbor base stations for a scanning section using the network topology advertisement message to check qualities of channels transmitted from the neighbor base stations (S202 ) .
  • the mobile subscriber station can perform a scanning process on all FAs supported by one target base station or can perform a scanning process on one of the entire FAs supported by one target base station .
  • a method of scanning one FA only for one target base station supporting multiple FAs is explained .
  • the mobile subscriber station selects a handover target base station suitable for handover from the neighbor base stations .
  • the mobile subscriber station transmits a handover request message (MOB-MSSHO-REQ) including information of the selected target base station to a serving base station (S203 ) .
  • MOB-MSSHO-REQ handover request message
  • the serving base station notifies that there exists the mobile subscriber station attempting to make a handover to the handover target base station via a handover request notification message (HO- pre-notification) (S204 ) .
  • the handover request notification message includes a mobile subscriber station identifier (MSS Identifier) , connection parameters , capabilities , information for a required bandwidth and a quality of service (QoS) and the like .
  • MSS Identifier mobile subscriber station identifier
  • connection parameters connection parameters
  • capabilities information for a required bandwidth and a quality of service (QoS) and the like .
  • QoS quality of service
  • the handover target base station decides which one of FAs supported by the handover target base station itself is supportable using the information included in the handover request notification message (S205) and then transmits a handover request notification response message (HO-pre- notification-response) including the corresponding result to the serving base station (S206) .
  • the handover notification response message includes reception
  • the mobile subscriber station carries out scanning on the third FA
  • the • handover request notification response message indicates that the fourth FA (FA4 ) is supportable .
  • the supportable FA information can directly indicate center frequency information or can be simplified using an FA identifier (FA_ID) agreed with each FA.
  • Table 2 shows an example of a handover request notification response message (H0-pre-notification- response) applicable to the present invention . [Table 2]
  • the serving base station having received the handover request notification response message from the target base station notifies the target base station that the handover shall be executed with the fourth FA (FA4) of the target base station via a handover confirmation message (HO- confirm) (S207) . And, the serving base station transmits a handover response message (MOB-HO-RSP) including the center frequency of the fourth FA (FA4 ) or the previously agreed FA_ID to the mobile subscriber station (S208) .
  • Table 3 shows an example of a handover response message applicable to the present invention.
  • the mobile subscriber station having received the handover response message transmits a handover execution indication message that indicates a handover execution to the serving base station (S209) .
  • the serving base station having received the message then releases a call for the mobile subscriber station (S210) .
  • Table 4 is an example of a handover ' execution indication message applicable to the present invention .
  • a field BS_ID indicates an ID of the serving base station and a field FA_ID indicates an identifier of the FA to which the handover will be made .
  • FIG . 3 is a flowchart of a handover process between frequency allocations (FAs) within one cell according to one embodiment of the present invention, in which the handover process is requested by a base station .
  • a base station can arbitrarily request a handover without a handover request from a mobile subscriber station (Unsolicited Handover) .
  • the base station transmits a handover request message (MOB-BSHO-REQ) to the mobile subscriber station (S301) so that the mobile subscriber station can perform handover via another FA within the base station .
  • the mobile subscriber station having received the handover request message does not have to perform the handover all the time but can rej ect the handover requested from the base station .
  • the handover request message transmitted from the base station to the mobile subscriber station includes information indicating whether the handover takes place between FAs within one cell or between FAs with the relation to another cell .
  • information for an action mode is included in the handover request message .
  • the action mode can include five cases as follows .
  • each of the cases (1) and (2 ) corresponds to a case that the handover is performed via the FA of the target base station and each of the cases (3 ) to (5) corresponds to a case that the handover is performed via a different FA within the serving base station.
  • Table 5 shows an example of a handover request message transmitted from a base station to a mobile subscriber station .
  • the handover request message can include the five kinds of action modes .
  • the mobile subscriber station having received the handover request message transmits a handover execution indication message (MOB-HO-Indication) notifying the handover execution to the serving base station (S302) .
  • the mobile subscriber station performs a network reentry procedure with the serving base station (S303 ) . In doing so, the mobile subscriber station carries out the network reentry procedure on the FA2 according to one of the five kinds of action modes .
  • FIG . 4 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention, in which the handover process is requested by a base station .
  • a serving base station notifies that there exists a mobile subscriber station attempting to make a handover to a handover target base station via a handover request notification message (HO-pre-notification)
  • HO-pre-notification a handover request notification message
  • the handover request notification message includes a mobile subscriber station identifier (MSS Identifier) , connection parameters , capabilities , information for a required bandwidth and a quality of service (QoS) and the like .
  • MSS Identifier mobile subscriber station identifier
  • connection parameters connection parameters
  • capabilities information for a required bandwidth
  • QoS quality of service
  • the handover target base station decides which one of FAs supported by the handover target base station itself is supportable for the mobile subscriber station using the information included in the handover request notification message (S402 ) and then transmits a handover request notification response message (HO-pre-notification- response) including the corresponding result to the serving base station (S403 ) .
  • the handover notification response message includes reception confirmation information for the handover request notification message, information indicating that the same
  • the supportable FA information can directly indicate center frequency information or can be simplified using an FA identifier (FA_ID) agreed with each FA.
  • FA_ID FA identifier
  • the serving base station having received the response message from the target base station notifies the target base station that the mobile subscriber station will make handover with a specific FA of the target base station via a handover confirmation message (S404 ) .
  • the serving base station transmits information for the specific FA to the mobile subscriber station using a handover request message (MOB-BSHO-REQ) (S405) .
  • the mobile subscriber station having received the handover request message then transmits a handover execution indication message (MOB-HO- IND) notifying the handover execution to the serving base station (S406) .
  • the mobile subscriber station performs scanning on neighbor base stations (S407) and decides whether to make handover with the specific FA of the target base station . In case of performing the handover with the specific FA, the mobile subscriber station receives fast ranging IE for the specific FA from the target base station (S408 ) .
  • FIG . 5 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention.
  • a serving base station transmits a re-registration/release command message (DREG-CMD) to a mobile subscriber station (S501) .
  • the re- registration/release command message (DREG-CMD) includes action codes having information for action contents performed by the mobile subscriber station in performing handover .
  • Table 6 shows an example of action codes and action contents following the action codes , respectively. [Table 6]
  • the mobile subscriber station releases FAl from the serving base station (S503 ) and performs a connection to FA2 in a handover target base station (S504) . In doing so, since there exists no network reentry procedure , a MAC address and CID (Connection Identifier) of the mobile subscriber station are maintained .
  • the mobile subscriber station releases FAl from the serving base station (S505) and performs a connection to FA2 in the handover target base station . In doing so, the mobile subscriber station receives fast ranging IE (S506) . Namely, the target base station performs a connection to the mobile subscriber station without contention in a manner of previously allocating FA2 to the mobile subscriber station that performs the handover . Hence, the MAC address of the mobile subscriber station is maintained as it is .
  • the mobile subscriber station releases FAl from the serving base station (S508) and newly performs the network reentry procedure on FA2 in the target base station (S509) .
  • the previous information such as the MAC address and CID of the mobile subscriber station are discarded .
  • the present invention provides the following effects or advantages .
  • the present invention enables the handover between FAs within one cell .
  • the present invention enables the handover between FAs in different cells .

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Abstract

A handover control method in a broadband wireless access system supporting multiple frequency allocations (FAs) is disclosed, in which a serving base station controls a handover. The handover control method includes the steps of receiving (S203) from a mobile subscriber station a handover request message including an identifier of the mobile subscriber station, transmitting (S204) a handover request notification message including the identifier of the mobile subscriber station to a handover target base station, receiving (S206) a handover request notification response message including information for frequency allocation supportable by the target base station, and transmitting (S208) a handover response message including the information for the frequency allocation to the mobile subscriber station. Accordingly, in the broadband wireless access system supporting multiple frequency allocations, the method enables the handover between frequency allocations within one cell or between frequency allocations in different cells.

Description

A METHOD FOR HANDOVER BETWEEN FREQUENCY ALLOCATION
IN BROADBAND WIRELESS ACCESS SYSTEM
TECHNICAL FIELD The present invention relates to a handover control method in a broadband wireless access system. Although the present invention is suitable for a wide scope of applications , it is particularly suitable for a base station (BS) to transmit data to a mobile subscriber station (MSS) using at least two frequency allocations (FA) .
BACKGROUND ART
Generally, in the IEEE802.16e system of which internal standardization for broadband wireless access system is in progress, more efficient data transmission is enabled using a plurality of frequency allocations (FAs) . Namely, unlike the conventional method of transmitting data within a band by allocating one frequency band to one base station, several frequency bands are allocated to one base station to increase subscriber accommodation and to transmit data more efficiently.
FIG . 1 is a diagram of inter-frequency handover within one cell and inter-frequency handover between different cells in a broadband wireless access system supporting multiple FAs .
Referring to FIG . 1 , in a multiple FA system, if a mobile subscriber station receives data using a first frequency band FAl within one cell , it may be attempted to receive data that need a wider bandwidth such as multimedia data . In this case , if a resource of the first frequency band FAl is already occupied by another mobile subscriber station, it is impossible to offer a multimedia service to the corresponding mobile subscriber station via the first frequency band FAl . So, the multimedia service may be enabled in a manner of allocating a second frequency band FA2 which is still reserved to the corresponding mobile subscriber station .
For this , an inter-FA handover is needed . The inter- FA handover, as shown in FIG. 1 , can be performed in two ways . Namely, a first case is that a handover 11 is carried out within one cell from the first frequency band FAl to the second frequency band FA2. And, a second case is that a handover 12 is carried out from a first frequency band FAl to a fourth frequency band FA4 in a cell using the first frequency band FAl . However, in case of using the multiple FA, it is necessary to perform the inter-FA handover within one cell or between different cells . Yet , an inter-FA handover method has not been proposed yet in case of using the multiple FA within one cell . Besides , in case that a mobile subscriber station performs handover from a serving base station to a handover target base station, it has not been decided yet that the handover is performed in which way of the multiple PA provided by the handover target base station . And, how to perform the handover in such a case has not been proposed yet .
DISCLOSURE OF THE INVENTION
Accordingly, the present invention is directed to a handover control method in a broadband wireless access system that substantially obviates one or more of the problems due to limitations and disadvantages of the related art .
An obj ect of the present invention is to provide a handover control method in a broadband wireless access system, in which a base station transmits data to a mobile subscriber station using at least two frequency allocations . Additional features and advantages of the invention will be set forth in the description which follows , and in part will be apparent from the description, or may be learned by practice of the invention. The obj ectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings . To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, in a broadband wireless access system supporting multiple frequency allocations , in which a serving base station controls a handover, a handover control method according to the present invention includes the steps of receiving from a mobile subscriber station a handover request message including an identifier of the mobile subscriber station, transmitting a handover request notification message including the identifier of the mobile subscriber station to a handover target base station, receiving a handover request notification response message including information for frequency allocation supportable by the target base station, and transmitting a handover response message including the information for the frequency allocation to the mobile subscriber station .
To further achieve these and other advantages and in accordance with the purpose of the present invention, in a broadband wireless access system, in which one base station supports multiple frequency allocation and controls a handover between frequency allocations , a handover control method includes the steps of transmitting to a mobile subscriber station a handover request message requesting that the handover shall be executed with a specific frequency allocation provided by the base station, receiving a handover execution indication message including information for a handover action mode from the mobile subscriber station, and performing a network reentry- procedure with the frequency allocation based on the action mode .
To further achieve these and other advantages and in accordance with the purpose of the present invention, in a broadband wireless access system having a base station supporting multiple frequency allocations , in which a serving base station controls a handover, a handover control method includes the steps of transmitting to a handover target base station a handover request notification message including an identifier of a mobile subscriber station which will perform the handover, receiving from the handover target base station a handover notification response message including information for a frequency allocation supportable for the mobile subscriber station, transmitting to the handover target base station a handover confirmation message notifying that the mobile subscriber station will perform the handover with the supportable frequency allocation, and transmitting to the mobile subscriber station a handover request message requesting the handover with the frequency allocation of the handover target base station .
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings , which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention .
In the drawings : FIG . 1 is a diagram of inter-frequency handover within one cell and inter-frequency handover between different cells in a broadband wireless access system supporting multiple FAs;
FIG . 2 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention, in which the handover process is requested by a mobile subscriber station;
FIG . 3 is a flowchart of a handover process between frequency allocations (FAs) within one cell according to one embodiment of the present invention, in which the handover process is requested by a base station;
FIG . 4 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention, in which the handover process is requested by a base station; and FIG . 5 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention .
BEST MODE FOR CARRYING OUT THE INVENTION
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings .
FIG . 2 is a flowchart of a handover process between frequency allocations (FAs) to a different cell according to one embodiment of the present invention, in which the handover process is requested by a mobile subscriber station .
Referring to FIG . 2 , a serving base station supports a first FA FAl and a second FA FA2 and a target base station supports a third FA FA3 and a fourth FA FA4 , for example .
A base station informs the information of neighbor base stations to all mobile subscriber stations within a cell via a network topology advertisement message (MOB_NBR- ADV) for network configuration associated information (S201) . Table 1 shows an example of a network topology advertisement message applicable to the present invention . [Table 1]
Figure imgf000009_0001
Figure imgf000010_0001
In Table 1 , a field FA_ID indicates what kind of FA is supported by a specific neighbor base station .
A mobile subscriber station carries out scanning on neighbor base stations for a scanning section using the network topology advertisement message to check qualities of channels transmitted from the neighbor base stations (S202 ) .
In doing so, the mobile subscriber station can perform a scanning process on all FAs supported by one target base station or can perform a scanning process on one of the entire FAs supported by one target base station . In the following description, a method of scanning one FA only for one target base station supporting multiple FAs is explained . First of al , once the scanning process is completed, the mobile subscriber station selects a handover target base station suitable for handover from the neighbor base stations . The mobile subscriber station then transmits a handover request message (MOB-MSSHO-REQ) including information of the selected target base station to a serving base station (S203 ) . The serving base station notifies that there exists the mobile subscriber station attempting to make a handover to the handover target base station via a handover request notification message (HO- pre-notification) (S204 ) . And, the handover request notification message includes a mobile subscriber station identifier (MSS Identifier) , connection parameters , capabilities , information for a required bandwidth and a quality of service (QoS) and the like . The handover target base station decides which one of FAs supported by the handover target base station itself is supportable using the information included in the handover request notification message (S205) and then transmits a handover request notification response message (HO-pre- notification-response) including the corresponding result to the serving base station (S206) . The handover notification response message includes reception confirmation information for the handover request notification message , information indicating that the same QoS of the QoS class transmitted via the handover request notification message is offered, and the like .
In the present embodiment , although the mobile subscriber station carries out scanning on the third FA
(FA3 ) among the FAs supported by the target base station, a case that the FA supportable by the target base station is the fourth FA (FA4 ) is explained as follows .
First of all , in case that the target base station can support the fourth FA (FA4 ) , the • handover request notification response message indicates that the fourth FA (FA4 ) is supportable . The supportable FA information can directly indicate center frequency information or can be simplified using an FA identifier (FA_ID) agreed with each FA.
Table 2 shows an example of a handover request notification response message (H0-pre-notification- response) applicable to the present invention . [Table 2]
Figure imgf000012_0001
Figure imgf000013_0001
The serving base station having received the handover request notification response message from the target base station notifies the target base station that the handover shall be executed with the fourth FA (FA4) of the target base station via a handover confirmation message (HO- confirm) (S207) . And, the serving base station transmits a handover response message (MOB-HO-RSP) including the center frequency of the fourth FA (FA4 ) or the previously agreed FA_ID to the mobile subscriber station (S208) . Table 3 shows an example of a handover response message applicable to the present invention.
[Table 3]
Figure imgf000013_0002
Figure imgf000014_0001
The mobile subscriber station having received the handover response message transmits a handover execution indication message that indicates a handover execution to the serving base station (S209) . The serving base station having received the message then releases a call for the mobile subscriber station (S210) .
•Table 4 is an example of a handover ' execution indication message applicable to the present invention . [Table 4]
Figure imgf000015_0001
In Table 4 , in case that the mobile subscriber station performs handover with another FA within the same cell , a field BS_ID indicates an ID of the serving base station and a field FA_ID indicates an identifier of the FA to which the handover will be made .
The mobile subscriber station receives fast ranging IE (Fast Ranging_ΪE) from the selected fourth FA (FA4) of the handover target base station (S211) and requests a ranging to the target base station (S212 ) using the received IE (S212 ) . The target base station then responds to the ranging (S213 ) so that the handover is performed. FIG . 3 is a flowchart of a handover process between frequency allocations (FAs) within one cell according to one embodiment of the present invention, in which the handover process is requested by a base station . Referring to FIG . 3 , a base station can arbitrarily request a handover without a handover request from a mobile subscriber station (Unsolicited Handover) . Namely, the base station transmits a handover request message (MOB-BSHO-REQ) to the mobile subscriber station (S301) so that the mobile subscriber station can perform handover via another FA within the base station . Yet , the mobile subscriber station having received the handover request message does not have to perform the handover all the time but can rej ect the handover requested from the base station . The handover request message transmitted from the base station to the mobile subscriber station includes information indicating whether the handover takes place between FAs within one cell or between FAs with the relation to another cell . Moreover, information for an action mode is included in the handover request message . And, the action mode can include five cases as follows .
(1) Handover supported by backbone data exchange on network (2 ) Handover not by backbone data exchange on network (3 ) A case that directly takes place with a different FA within a cell of a serving base station
(4 ) A case of undergoing a network entry process for a new FA if handover takes place with a different FA within a cell of a serving base station
(5) A case of enabling a mobile subscriber station to perform fast handover in a manner that a serving base station
• previously allocates a non-contention ranging area necessary for a handover of the mobile subscriber station and an FA Hence , each of the cases (1) and (2 ) corresponds to a case that the handover is performed via the FA of the target base station and each of the cases (3 ) to (5) corresponds to a case that the handover is performed via a different FA within the serving base station.
Table 5 shows an example of a handover request message transmitted from a base station to a mobile subscriber station . [Table 5]
Figure imgf000017_0001
Figure imgf000018_0001
The handover request message , as shown in Table 5 , can include the five kinds of action modes .
The mobile subscriber station having received the handover request message transmits a handover execution indication message (MOB-HO-Indication) notifying the handover execution to the serving base station (S302) . And, the mobile subscriber station performs a network reentry procedure with the serving base station (S303 ) . In doing so, the mobile subscriber station carries out the network reentry procedure on the FA2 according to one of the five kinds of action modes .
FIG . 4 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention, in which the handover process is requested by a base station . Referring to FIG . 4 , a serving base station notifies that there exists a mobile subscriber station attempting to make a handover to a handover target base station via a handover request notification message (HO-pre-notification)
(S401 ) . And, the handover request notification message includes a mobile subscriber station identifier (MSS Identifier) , connection parameters , capabilities , information for a required bandwidth and a quality of service (QoS) and the like .
The handover target base station decides which one of FAs supported by the handover target base station itself is supportable for the mobile subscriber station using the information included in the handover request notification message (S402 ) and then transmits a handover request notification response message (HO-pre-notification- response) including the corresponding result to the serving base station (S403 ) .
The handover notification response message includes reception confirmation information for the handover request notification message, information indicating that the same
QoS of the QoS class transmitted via the handover request notification message is offered, and the like (S403 ) .
The supportable FA information can directly indicate center frequency information or can be simplified using an FA identifier (FA_ID) agreed with each FA.
The serving base station having received the response message from the target base station notifies the target base station that the mobile subscriber station will make handover with a specific FA of the target base station via a handover confirmation message (S404 ) .
And, the serving base station transmits information for the specific FA to the mobile subscriber station using a handover request message (MOB-BSHO-REQ) (S405) . The mobile subscriber station having received the handover request message then transmits a handover execution indication message (MOB-HO- IND) notifying the handover execution to the serving base station (S406) .
The mobile subscriber station performs scanning on neighbor base stations (S407) and decides whether to make handover with the specific FA of the target base station . In case of performing the handover with the specific FA, the mobile subscriber station receives fast ranging IE for the specific FA from the target base station (S408 ) .
FIG . 5 is a flowchart of a handover process between frequency allocations (FAs) in different cells according to one embodiment of the present invention.
Referring to FIG . 5 , a serving base station transmits a re-registration/release command message (DREG-CMD) to a mobile subscriber station (S501) . The re- registration/release command message (DREG-CMD) includes action codes having information for action contents performed by the mobile subscriber station in performing handover . Table 6 shows an example of action codes and action contents following the action codes , respectively. [Table 6]
Figure imgf000021_0001
Figure imgf000022_0001
In case that the action code (Action Code) included in the re-registration/release command message is 0x08 , the mobile subscriber station releases FAl from the serving base station (S503 ) and performs a connection to FA2 in a handover target base station (S504) . In doing so, since there exists no network reentry procedure , a MAC address and CID (Connection Identifier) of the mobile subscriber station are maintained .
In case that the action code (Action Code) included in the re-registration/release command message is 0x09 , the mobile subscriber station releases FAl from the serving base station (S505) and performs a connection to FA2 in the handover target base station . In doing so, the mobile subscriber station receives fast ranging IE (S506) . Namely, the target base station performs a connection to the mobile subscriber station without contention in a manner of previously allocating FA2 to the mobile subscriber station that performs the handover . Hence, the MAC address of the mobile subscriber station is maintained as it is .
In case that the action code (Action Code) included in the re-registration/release command message is OxOa, the mobile subscriber station releases FAl from the serving base station (S508) and newly performs the network reentry procedure on FA2 in the target base station (S509) . Hence , the previous information such as the MAC address and CID of the mobile subscriber station are discarded .
INDUSTRIAL APPLICABILITY
Accordingly, in the broadband wireless access system supporting the multiple FA, the present invention provides the following effects or advantages .
First of all , the present invention enables the handover between FAs within one cell .
Secondly, the present invention enables the handover between FAs in different cells .
While the present invention has been described and illustrated herein with reference to the preferred embodiments thereof , it will be apparent to those skilled in the art that various modifications and variations can be made therein without departing from the spirit and scope of the invention . Thus , it is intended that the present invention covers the modifications and variations of this invention that come within the scope of the appended claims and their equivalents .

Claims

WHAT IS CLAIMED IS :
1. In a broadband wireless access system supporting multiple frequency allocations, in which a serving base station controls a handover, a handover control method comprising the steps of : receiving from a mobile subscriber station a handover request message including an identifier of the mobile subscriber station; transmitting a handover request notification message including the identifier of the mobile subscriber station to a handover target base station; receiving a handover request notification response message including information for frequency allocation supportable by the target base station,- and transmitting a handover response message including the information for the frequency allocation to the mobile subscriber station .
2. The handover control method of claim 1 , wherein the information for the frequency allocation is a center frequency of an allocated frequency band .
3. The handover control method of claim 1 , wherein the information for the frequency allocation is a frequency allocation identifier corresponding to an allocated frequency band .
4. The handover control method of claim 1 , further comprising a step of transmitting to the target base station a handover confirmation message indicating that the mobile subscriber station will perform the handover with the supportable frequency allocation in response to the handover request notification response message .
5. The handover control method of claim 1 , wherein the handover request notification message further includes connection parameters , capability, required bandwidth and information for quality of service .
6. The handover control method of claim 1 , wherein the handover request notification response message further includes information for acknowledgement of the handover request notification message and information for whether a requested quality of service will be provided .
7. The handover control method of claim 1 , further comprising a step of receiving from the mobile subscriber station a handover execution indication message including information for an action mode according to a handover execution type .
8. The handover control method of claim 7 , wherein the action mode corresponds to one selected from the group consisting of a first case of the handover supported by backbone data exchange on network, a second case of the handover not by backbone data exchange on network, a third case that the handover directly takes place with a different FA within a cell of the serving base station, a fourth case of undergoing a network entry process for a new frequency allocation (FA) if the handover takes place with a different frequency allocation (FA) within a cell of the serving base station, and a fifth case of enabling the mobile subscriber station to perform fast handover in a manner that the serving base station previously allocates a non-contention ranging area necessary for the handover of the mobile subscriber station and the frequency allocation .
9. The handover control method of claim 7 , further comprising a step of releasing a call for the mobile subscriber station after receiving the handover execution indication message .
10. The handover control method of claim 9 , further comprising a step of transmitting a re-registration/release command message wherein the call of the mobile subscriber station is released based on information included in the re-registration/release command message .
11. The handover control method of claim 10 , wherein the information included in the re- registration/release command message is an action code .
12. The handover control method of claim 11 , wherein the action code indicates that the call shall be released while the mobile subscriber station maintains both a medium access control (MAC) address and a connection identifier (CID) of the mobile subscriber station.
13. The handover control method of claim 11 , wherein the action code indicates that the call shall be released while the mobile subscriber station maintains a medium access control (MAC) address of the mobile subscriber station.
14. The handover control method of claim 11 , wherein the action code indicates that a medium access control (MAC) address and a connection identifier (CID) of the mobile subscriber station are deleted to execute a network reentry to the handover target base station .
15. The handover control method of claim 1 , wherein the handover target base station supports at least two frequency allocations .
16. The handover control method of claim 15 , wherein the supportable frequency allocation corresponds to one selected from the group consisting of at least two frequency allocations supported by the handover target base station.
17. The handover control method of claim 1 , further comprising a step of transmitting a network topology advertisement message including information for neighbor base stations to other mobile subscriber stations including the mobile subscriber station within an area of the serving base station.
18. In a broadband wireless access system, in which one base station supports multiple frequency allocation and controls a handover between frequency allocations , a handover control method comprising the steps of : transmitting to a mobile subscriber station a handover request message requesting that the handover shall be executed with a specific frequency allocation provided by the base station; receiving a handover execution indication message including information for a handover action mode from the mobile subscriber station; and performing a network reentry procedure with the frequency allocation based on the action mode .
19. The handover control method of claim 18 , wherein the action mode corresponds to one selected from the group consisting of a first case of the handover supported by backbone data exchange on network, a second case of the handover not by backbone data exchange on network, a third case that the handover directly takes place with a different FA within a cell of the serving base station, a fourth case of undergoing a network entry process for a new frequency allocation (FA) if the handover takes place with a different frequency allocation (FA) within a cell of the serving base station, and a fifth case of enabling the mobile subscriber station to perform fast handover in a manner that the serving base station previously allocates a non-contention ranging area necessary for the handover of the mobile subscriber station and the frequency allocation .
20. In a broadband wireless access system having a base station supporting multiple frequency allocations , in which a serving base station controls a handover, a handover control method comprising the steps of : transmitting to a handover target base station a handover request notification message including an identifier of a mobile subscriber station which will perform the handover; receiving from the handover target base station a handover notification response message including information for a frequency allocation supportable for the mobile subscriber station; transmitting to the handover target base station a handover confirmation message notifying that the mobile subscriber station will perform the handover with the supportable frequency allocation; and transmitting to the mobile subscriber station a handover request message requesting the handover with the frequency allocation of the handover target base station .
21. The handover control method of claim 20 , further comprising a step of receiving from the mobile subscriber station a handover execution indication message notifying that the mobile subscriber station will perform the handover with the frequency allocation of the handover target base station .
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EP05856317A EP1762115B1 (en) 2004-06-08 2005-06-08 Method and apparatus for handover in a broadband wireless access system with selection of frequency allocation in target base station
JP2007527005A JP4756043B2 (en) 2004-06-08 2005-06-08 Handover method between frequency allocation in broadband wireless access system
CN2005800183872A CN101411225B (en) 2004-06-08 2005-06-08 Method for performing handover between frequency allocations in a broadband wireless access system
US11/570,228 US8036663B2 (en) 2004-06-08 2005-06-08 Method for handover between frequency allocation in broadband wireless access system
AT05856317T ATE530043T1 (en) 2004-06-08 2005-06-08 METHOD AND APPARATUS FOR HANDOVER IN A WIRELESS BROADBAND ACCESS SYSTEM WITH SELECTION OF FREQUENCY ASSIGNMENT IN THE TARGET BASE STATION
US11/766,006 US8855638B2 (en) 2004-06-08 2007-06-20 Method for transitioning communications of a mobile subscriber station from a serving base station to a target base station

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US20080039090A1 (en) 2008-02-14
ATE550897T1 (en) 2012-04-15
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ATE530043T1 (en) 2011-11-15
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