JP4619435B2 - Handover execution method in broadband wireless access system - Google Patents

Abstract

The primitives between an upper management layer and the MAC layer within a mobile station and a base station are defined in order to specify and clarify the operations within the protocol stack layers in a broadband wireless access system to allow a mobile station to execute handover. Media Independent Handover (MIH) procedures can be achieved because the NCMS and MIH layer can communicate through use of these primitives.

Description

  The present invention relates to a broadband wireless access system, and more particularly to a method for clearly defining primitives used in a protocol stack in a mobile station and a protocol stack in a base station so that an efficient handover can be performed.

  The IEEE 802.16e system, which is internationally standardizing broadband wireless access systems, includes HLR (Home Location Register), VLR (Visitor Location Register), MSC (Mobile Switching Center), like existing 2G and 3G mobile communication systems. It does not have a hierarchical structure such as BSC (Base Station Controller) and RNC (Radio Network Controller), but only MSS (Mobile Subscriber Station), BS (Base Station), and ASA (Authentication Service).

  A broadband wireless access system defines a medium access control (MAC) layer and a physical (PHY) layer protocol that are common between a base station and a mobile station (MSS). FIG. 1 is a diagram showing a protocol layer structure of a broadband wireless access system.

  Hereinafter, in the prior art, a procedure for a mobile terminal to execute a handover from one base station to another base station will be described.

1) Cell Selection
The mobile station can obtain information on the neighboring base station using a neighboring base station advertisement message (for example, MOB_NBR-ADV) broadcast by the serving base station or scanning.

2) Handover Decision and Initiation (Handover Decision and Initiation)
The decision to perform a handover of the mobile station to another base station can be initiated by the mobile station or the current serving base station.

3) Target BS Scanning
The mobile station must scan the target base station for downlink and uplink channels and their synchronization.

4) Network Re-entry (Network Re-entry)
The mobile station and the target base station must perform ranging to enable mobile station network reentry.

5) Termination of Service
After executing the handover to another base station, the mobile station ends all services with the previous base station.

  Hereinafter, a message related to handover will be described in the related art.

1) MOB_MSHO-REQ message The mobile station transmits a MOB_MSHO-REQ message to the base station in order to request handover. The MOB_MSHO-REQ message includes a target base station ID for handover recommended by the mobile station, a preamble index value, a CINR value, a HO-ID, and the like.

2) MOB_BSHO-RSP message After receiving the MOB_MSHO-REQ message from the mobile station, the base station transmits a MOB_BSHO-RSP message to the mobile station as a response thereto.

3) MOB_BSHO-REQ message This is a message that the base station sends to a mobile station that is currently connected to the base station itself in order to request a handover to another base station. The MOB_BSHO-REQ message includes information on neighboring base stations recommended by the base station.

4) MOB_HO-IND message This means that the mobile station receives the MOB_BSHO-RSP or MOB_BSHO-REQ message, and finally determines the target base station to execute the handover, and then disconnects from the current serving base station. However, it is transmitted when attempting to perform handover to another base station.

  FIG. 2 is a diagram showing a procedure for executing handover in a conventional broadband wireless access system.

  (1) The mobile station acquires information related to the neighboring base station by using the scanning procedure and the neighboring base station broadcast message.

  (2) The mobile station transmits a request message for requesting handover to the current serving base station. At this time, transmission is performed including a candidate base station (Recommended BS) based on information acquired by the scanning procedure.

  (3) The current serving base station, after receiving the request message, notifies the candidate base station of a handover advance notification (HO-pre-notification) including values such as a mobile station identifier, a required bandwidth, and connection parameters. Send a message.

  (4) As a response to this, the candidate base station transmits a handover advance notification response (HO-pre-notification-rsp) message.

  (5) The current serving base station checks the response message of the candidate base station, determines a target base station suitable for the mobile station, and transmits a handover confirmation (HO-confirm) message to the target base station. Then, a handover response (MOB-HO-RSP) message is transmitted to the mobile station.

  (6) The mobile station finally transmits a MOB_HO-indication message to the base station in order to execute handover.

  (7) The mobile station performs ranging with the base station to be handed over.

  As described above, in the prior art, a message transmitted and received by a mobile station with a base station to perform scanning is defined. However, operations related to scanning are actually performed by a protocol stack (layer) and a base in the mobile station. The protocol stack (layer) in the station is not defined. In other words, primitives relating to information transmitted between the MAC layer and higher management entities via a network control management system (NCMS) are not defined in the protocol stack of the mobile station and the base station.

  One aspect of the present invention relates to our perception of the problems of the prior art as described above. In order to solve such a problem of the prior art, the present invention provides an upper management layer for clarifying the operation in the protocol stack layer in the broadband wireless access system so that the mobile station can execute handover. Provides a way to define primitives between the MAC and MAC layers.

  According to the present invention, when a mobile station performs a handover using a primitive defined by the present invention, an accurate operation in the protocol stack layer can be realized. Therefore, by using such primitives, communication between NCMS and Media Independent Handover (MIH) layer can be performed in a direct or indirect manner, and thus the MIH procedure can be realized.

  The invention is described as being implemented in a broadband wireless access system such as an 802.16e network. However, the present invention can be applied and realized in a communication system compliant with other types of communication standards (for example, 802.16g, 802.21, 802.11u, etc.). This is because the concept and contents of the present invention can be applied to various communication schemes operating in a similar manner based on a common technology. Embodiments of the present invention will be described below with reference to the accompanying drawings. However, the present invention is not limited to this embodiment.

  Further, in a predetermined aspect of the present invention, a specific name such as an entity, an interface, a primitive, or a message is described. However, those skilled in the art will clearly understand that other names (labels, terms, etc.) can be used as long as the function falls within the teachings of the present invention without being limited to such names. .

  In the present invention, the primitive is transferred from the MAC layer to the necessary upper management entity via the NCMS, so that the entity that previously managed or controlled the system (mobile station or base station) can change the MAC layer and the PHY layer. Provide a way to manage it. In particular, it provides a method for defining primitives that must be communicated between the MAC layer and higher management entities via NCMS in the protocol stack in the mobile station and base station when the mobile station performs scanning.

  Here, the “management entity” refers to all entities that interface with the NCMS, and includes a logical management entity or a physical management entity in the IP layer or higher layer in the device. In the operation of the present invention, communication is performed from a higher management entity to a management SAP (Management SAP; M-SAP) or a control SAP (Control SAP; C-SAP) via NCMS, so that NCMS sends a primitive directly. Expressed.

  In the present invention, the upper management entity is located above the hierarchical management entity in the protocol stack as shown in FIG. 1, and is a physical upper management entity or logic communicated via NCMS or the management SAP of the hierarchical management entity. Is divided into general upper management entities. The upper management entity may exist within a specific protocol stack or may exist as a separate independent system or stack, but conceptually uses the term upper management entity.

  FIG. 3 is a diagram illustrating a protocol structure model considering media independent handover (MIH).

  The primitive proposed in the present invention is transmitted to the NCMS via the management SAP (M-SAP) or the control SAP (C-SAP), and the NCMS may transmit the primitive to a necessary place including the upper management entity. it can.

  The M-SAP has functions such as system configuration, monitoring statistics, notification / trigger, but is not limited thereto. C-SAP includes handover (eg, mobile station handover request notification), idle mode mobility management (eg, mobile station transition to idle mode), subscriber and session management (eg, mobile station session setup request). ), But has functions such as radio resource management, but is not limited thereto. The primitives of the present invention can be classified according to their functions, and can be transmitted via the M-SAP and / or C-SAP.

  4 and 5 show the principle of primitive operation according to the present invention. Primitives that require interaction with a remote entity are shown in FIG. 4, and primitives that are communicated only within the local stack are shown in FIG.

  As shown in FIG. 4, when there is interaction with a remote entity, “request” and “confirmation”, “response” and “instruction” are paired with each other.

  As shown in FIG. 5, when the operation is performed in the local stack, there can be two cases of mutual exchange (bidirectional operation) and unidirectional operation between the management entity and the NCMS. In the case of bidirectional operation, the transmission from the management entity to the NCMS via the M-SAP / C-SAP is called a “request”, and the response transmitted thereto is called an “instruction”. In the case of unidirectional operation, transmission from the management entity to NCMS via M-SAP / C-SAP is called “request”, and unidirectional transmission in the opposite direction is called “instruction”.

  The primitive according to the present invention can be used when the management entity is a multi-mode mobile station that indicates a corresponding mode, or when the corresponding mode transmits information to all multi-mode managing entities. In this case, it can be divided into the following two cases.

  In the first case, primitives are transmitted from the MIH layer or MIH function to the lower layer. The MIH (layer or function) may also analyze the information (command, etc.) received from the upper layer and transmit the corresponding primitive. In addition, information (commands) of higher layers can be mapped and transmitted with information (commands) of the present invention.

  The second is a case where primitives are transmitted from the lower layer to the MIH layer or MIH function. MIH (layer or function) analyzes the primitive received from the lower layer and sends it to the upper level (unified as defined by MIH). Primitives) can be transmitted, and lower layer primitives can be simply mapped to primitives sent to the upper layer and transmitted.

  When used for MIH, primitives defined in the present invention are transmitted via SAP between NCMS and MIH or SAP between management entity and MIH, thereby enabling MIH technology.

  A handover execution method in a broadband wireless access system includes a step in which a MAC layer of a mobile station receives a handover request message from a serving base station, and a MAC layer of the mobile station is included in a handover request message from the serving base station Transmitting information to the upper management entity using a first primitive, the upper management entity transmitting a second primitive to the MAC layer of the mobile station and responding, and the MAC layer of the mobile station responding to the serving base Transmitting a handover request message to the station and performing a handover to the target base station.

  In the broadband wireless access system, a handover execution method includes: a MAC layer of the serving base station transmits a third primitive to an upper management entity to notify that the mobile station has handed over to another base station; An upper management entity of the mobile station transmits a fourth primitive to the MAC layer of the mobile station to instruct the mobile station to perform a network reentry process to the target base station; Transmitting an RNG-REQ message to the target base station; and after the MAC layer of the target base station receives the RNG-REQ message, information included in the RNG-REQ message is transmitted to the target base station by a fifth primitive. Communicating to the upper management entity of the station; and The upper management entity of the get base station responds by transmitting a sixth primitive; the target base station transmits an RNG-RSP message to the MAC layer of the mobile station; and the MAC layer of the mobile station After receiving the RNG-RSP message, transmitting information included in the RNG-RSP message to the upper management entity of the mobile station by a seventh primitive.

  In order to enable the mobile station to execute handover using the MAC message transmitted / received to / from the base station and the primitive proposed in the present invention, operations performed between the mobile station and the upper management entity in the base station and the MAC layer are performed. An embodiment to be described will be described with reference to FIGS. 6 and 7.

  FIG. 6 is a flowchart showing an embodiment of the present invention, which is an embodiment when a mobile station requests a handover to a base station using a MOB_MSHO-REQ message.

  The upper management entity of the mobile station transmits the M_MACHandover. A request is transmitted to the MAC layer of the mobile station [S51], and the MAC layer of the mobile station is instructed to transmit a MOB_MSHO-REQ message to the MAC layer of the serving base station BS1. The MAC layer of the mobile station transmits a MOB_MSHO-REQ message to the MAC layer of the serving base station BS1 [S52].

  The MAC layer of the serving base station is M_MACHandover. By transmitting the indication primitive, the mobile station handover request is notified to the upper management entity of the serving base station [S53]. The upper management entity of the serving base station notifies the MAC layer of the serving base station of the result of the handover request of the mobile station to the MAC layer of the serving base station. A response primitive is transmitted [S54]. The MAC layer of the serving base station transmits a MOB_BSHO-RSP message to the MAC layer of the mobile station [S55].

  The MAC layer of the mobile station notifies M_MACHandover.M to notify the upper management entity of the mobile station of the handover request result. The confirmation primitive is transmitted [S56]. The upper management entity of the mobile station finally determines a target base station to execute a handover, and then notifies M_HOIND. The request primitive is transmitted [S57]. The MAC layer of the mobile station transmits a MOB_HO-IND message to the serving base station [S58] and performs a handover to the target base station BS2.

  The MAC layer of the mobile station is M_HOIND. The confirmation primitive is transmitted to the upper management entity of the mobile station, and the result of the MOB_HO-IND message transmission is notified to the upper management entity of the mobile station [S59]. The upper management entity of the mobile station transmits M_Ranging.M to the MAC layer of the mobile station. A request primitive is transmitted [S60], and the mobile station instructs the target base station to perform a network reentry process.

  The MAC layer of the mobile station transmits an RNG-REQ message to the target base station [S61]. After receiving the RNG-REQ message, the MAC layer of the target base station transmits information included in the RNG-REQ message to M_Ranging. The information is transmitted to the upper management entity of the target base station by an indication primitive [S62]. The upper management entity of the target base station responds to the M_Ranging. A response primitive is transmitted to respond [S63]. The target base station transmits an RNG-RSP message to the MAC layer of the mobile station [S64]. After receiving the RNG-RSP message, the MAC layer of the mobile station transmits information included in the RNG-RSP message to M_Ranging. The information is transmitted to the upper management entity of the mobile station using a confirmation primitive [S65].

  FIG. 7 is a flowchart showing another embodiment of the present invention, in which the base station uses the MOB_BSHO-REQ message to request a handover from the mobile station.

  The upper management entity of the serving base station BS1 has M_MACHandover.M in the MAC layer of the serving base station BS1. The request primitive is transmitted [S71], and the MAC layer of the serving base station BS1 instructs the mobile station to transmit a handover request message. The MAC layer of the serving base station transmits a MOB_BSHO-REQ message to the mobile station [S72]. The MAC layer of the mobile station sends a handover request message of the serving base station to M_MACHandover. It is transmitted to the upper management entity of the mobile station by an indication primitive [S73]. The upper management entity of the mobile station transmits M_MACHandover. A response primitive is transmitted to respond [S74]. The MAC layer of the mobile station transmits a MOB_HO-IND message to the serving base station [S75] and performs a handover to the target base station BS2.

  The MAC layer of the serving base station transmits M_MACHandover.M to the upper management entity of the serving base station. A confirmation primitive is transmitted [S76] to notify that the mobile station has handed over to another base station.

  The upper management entity of the mobile station transmits M_Ranging.M to the MAC layer of the mobile station. Transmitting a request primitive, the mobile station instructs the target base station to perform a network reentry process [S77]. The MAC layer of the mobile station transmits an RNG-REQ message to the target base station [S78].

  After receiving the RNG-REQ message, the MAC layer of the target base station transmits information included in the RNG-REQ message to M_Ranging. The information is transmitted to an upper management entity of the target base station using an indication primitive [S79]. The upper management entity of the target base station responds to the M_Ranging. A response primitive is transmitted to respond [S80]. The target base station transmits an RNG-RSP message to the MAC layer of the mobile station [S81]. After receiving the RNG-RSP message, the MAC layer of the mobile station transmits information included in the RNG-RSP message to M_Ranging. The information is transmitted to an upper management entity of the mobile station by a confirmation primitive [S82].

  Hereinafter, as described with reference to FIGS. 6 and 7, a management SAP (Management SAP; M_SAP) or a control SAP (Control SAP; C_SAP) is used to execute a handover requested by a mobile station or a base station. The primitive to be transmitted will be described in detail.

(1) M_MACHandover. request primitive 1) Function M_MACHandover. The request primitive is transmitted by the upper management entity of the mobile station instructing the MAC layer of the mobile station to transmit a handover request message to the base station.

2) Semantics M_MACHandover. request
{
Source,
Destination,
N_Recommended
Neighbor BS ID,
BS CINR Mean,
Current link identifier,
HandoverMode,
Current link action
}
The table below shows M_MACHandover. An example of the data format of a request primitive is shown.

３）生成時点
Ｍ＿ＭＡＣＨａｎｄｏｖｅｒ．ｒｅｑｕｅｓｔプリミティブは、移動局の上位管理エンティティがＭＡＣ層にハンドオーバー要求メッセージ（ＭＯＢ＿ＭＳＨＯ−ＲＥＱ）を基地局に伝送するように指示する場合に生成される。

3) Generation time M_MACHandover. The request primitive is generated when the upper management entity of the mobile station instructs the MAC layer to transmit a handover request message (MOB_MSHO-REQ) to the base station.

4) Effect upon reception The MAC layer of the mobile station is M_MACHandover. After receiving the request primitive, a MOB_MSHO-REQ message is transmitted to the currently connected base station.

(2) M_MACHandover. indication primitive 1) Function M_MACHandover. The indication primitive is used by the MAC layer of the base station to transmit a handover request from the mobile terminal to the upper management entity of the base station.

2) Semantics M_MACHandover. indication
{
Source,
Destination,
MS MAC Address,
N_Recommended,
Neighbor BS ID,
BS CINR Mean,
Current link identifier,
HandoverMode,
Current link action
}
The table below shows M_MACHandover. An example of the data format of an indication primitive is shown.

３）生成時点
Ｍ＿ＭＡＣＨａｎｄｏｖｅｒ．ｉｎｄｉｃａｔｉｏｎプリミティブは、基地局のＭＡＣ層が移動局からＭＯＢ＿ＭＳＨＯ−ＲＥＱメッセージを受信した後、これを基地局の上位管理エンティティに伝達する場合に生成される。

3) Generation time M_MACHandover. The indication primitive is generated when the MAC layer of the base station receives the MOB_MSHO-REQ message from the mobile station and then transmits it to the upper management entity of the base station.

4) Effect at the time of reception The upper management entity of the base station is M_MACHandover. After receiving the indication primitive, a base station recommended for handover of the mobile station is determined using a backbone message with the target base station.

(3) M_MACHandover. response primitive 1) Function M_MACHandover. The response primitive is used by the upper management entity of the base station to instruct the base station MAC layer to transmit the result of the mobile station handover request.

2) Semantics M_MACHandover. response
{
Source,
Destination,
N_Recommended,
Neighbor BS ID,
HO Process Optimization,
HOID
}
The table below shows M_MACHandover. It shows an example of the data format of the response primitive.

３）生成時点
Ｍ＿ＭＡＣＨａｎｄｏｖｅｒ．ｒｅｓｐｏｎｓｅプリミティブは、基地局の上位管理エンティティが移動局のハンドオーバー要求に対する結果を基地局のＭＡＣ層に伝達する場合に生成される。

3) Generation time M_MACHandover. The response primitive is generated when the upper management entity of the base station transmits the result of the mobile station handover request to the MAC layer of the base station.

4) Effect at the time of reception The MAC layer of the base station is M_MACHandover. After receiving the response primitive, a MOB_BSHO-RSP message is transmitted to the mobile station.

(4) M_MACHandover. confirmation primitive 1) Function M_MACHandover. The confirmation primitive is used by the MAC layer of the mobile station to transmit the result of the handover request received from the base station to the upper management entity of the mobile station.

2) Semantics M_MACHandover. confirmation
{
Source,
Destination,
N_Recommended,
Neighbor BS ID,
HO Process Optimization,
HOID,
Current link identifier,
HandoverAck
}
The table below shows M_MACHandover. An example of a data format of a confirmation primitive is shown.

３）生成時点
Ｍ＿ＭＡＣＨａｎｄｏｖｅｒ．ｃｏｎｆｉｒｍａｔｉｏｎプリミティブは、移動局のＭＡＣ層が基地局からＭＯＢ＿ＢＳＨＯ−ＲＳＰメッセージを受信した後、ハンドオーバー要求結果を移動局の上位管理エンティティに伝達する場合に生成される。

3) Generation time M_MACHandover. The confirmation primitive is generated when the MAC layer of the mobile station receives the MOB_BSHO-RSP message from the base station and then transmits the handover request result to the upper management entity of the mobile station.

4) Effect at the time of reception The upper management entity of the mobile station is M_MACHandover. After receiving the confirmation primitive, it is determined whether or not to perform handover to the target base station.

(5) M_HOIND. request primitive 1) Function M_HOIND. The request primitive is used to notify the MAC layer about the target base station after the upper management entity of the mobile station determines the target base station that will perform the final handover.

2) Semantics M_HOIND. request
{
Source,
Destination,
HO_IND_type,
Target_BS_ID
Current link action
}
The table below shows M_HOIND. An example of the data format of a request primitive is shown.

３）生成時点
Ｍ＿ＨＯＩＮＤ．ｒｅｑｕｅｓｔプリミティブは、移動局の上位管理エンティティがターゲット基地局を決定した後、ＭＡＣ層に前記ターゲット基地局へのハンドオーバーを実行するように指示する場合に生成される。

3) Generation time M_HOIND. The request primitive is generated when the upper management entity of the mobile station determines the target base station and then instructs the MAC layer to perform a handover to the target base station.

4) Effect at the time of reception The MAC layer of the mobile station performs the M_HOIND. After receiving the request primitive, a MOB_HO-IND message is transmitted to the base station, and when “HO_IND_type” indicates a handover, the mobile station executes a handover to the target base station.

(6) M_HOIND. confirmation primitive 1) Function M_HOIND. The confirmation primitive is used to notify the upper management entity of the MOB_HO-IND message after the MAC layer of the mobile station transmits the MOB_HO-IND message to the base station.

2) Semantics M_HOIND. confirmation
{
Source,
Destination,
ResultCode,
Current link action,
HandoverStatus
}
The table below shows M_HOIND. An example of a data format of a confirmation primitive is shown.

３）生成時点
Ｍ＿ＨＯＩＮＤ．ｃｏｎｆｉｒｍａｔｉｏｎプリミティブは、移動局のＭＡＣ層が基地局にＭＯＢ＿ＨＯ−ＩＮＤメッセージを送信した後、これに対する結果を移動局の上位管理エンティティに伝送する場合に生成される。

3) Generation time M_HOIND. The confirmation primitive is generated when the MAC layer of the mobile station transmits a MOB_HO-IND message to the base station and then transmits the result to the upper management entity of the mobile station.

4) Effect at the time of reception The upper management entity is the M_HOIND. After receiving the confirmation primitive, it is known whether or not the MOB_HO-IND message has been successfully transmitted.

(7) M_Ranging. request primitive 1) Function M_Ranging. The request primitive is used to request distance measurement. The upper management entity of the mobile station is the M_Ranging. A request primitive can be used to request the MAC layer to perform distance measurement.

2) Semantics M_Ranging. request
{
RangingType
}
The table below shows M_Ranging. An example of the data format of a request primitive is shown.

３）生成時点
Ｍ＿Ｒａｎｇｉｎｇ．ｒｅｑｕｅｓｔプリミティブは、ハンドオーバー実行後に初期段階でネットワークに接続するために、アイドルモードの端末が位置更新を行うか、アイドルモードでネットワーク接続を試みるか、又は周期的に測距を行う場合、上位管理エンティティにより生成される。

3) Generation time M_Ranging. In order to connect to the network at the initial stage after the handover is executed, the request primitive is superordinately managed when the terminal in the idle mode updates the position, tries to connect to the network in the idle mode, or periodically performs distance measurement. Generated by the entity.

4) Effect upon reception The upper management entity is M_Ranging. When the request primitive is received, the RNG-REQ MAC management message or the ranging CDMA code is transmitted through the air interface including the corresponding TLV (Type Length Value) required according to “RangingType”.

(8) M_Ranging. indication primitive 1) Function M_Ranging. The indication primitive is used to notify that a ranging request to the upper management entity has been received by the MAC management message.

2) Semantics M_Ranging. indication
{
MS Address,
CDMA Code,
MAC version,
Required Downlink Burst Profile,
Serving BS ID,
Target BS ID,
HO Indication,
Location Update Request,
Paging Controller ID
}
The table below shows M_Ranging. An example of the data format of an indication primitive is shown.

３）生成時点
Ｍ＿Ｒａｎｇｉｎｇ．ｉｎｄｉｃａｔｉｏｎプリミティブは、エアインタフェースを介してＭＡＣ層がＲＮＧ−ＲＥＱ又は測距コードを受信するときに生成される。

3) Generation time M_Ranging. The indication primitive is generated when the MAC layer receives an RNG-REQ or a ranging code via the air interface.

4) Effect at the time of reception The MAC layer analyzes the received ranging request and receives M_Ranging. Generate a response primitive.

(9) M_Ranging. response primitive 1) Function M_Ranging. The response primitive is used to notify the result of the ranging request.

2) Semantics M_Ranging. response
{
MSAddress,
ResultCode,
ManagementCIDs,
Resource Retain Flag,
HO Process Optimization,
Location Update Response,
Paging Information,
Paging Controller ID,
Next Periodic Ranging
}
The table below shows M_Ranging. It shows an example of the data format of the response primitive.

３）生成時点
Ｍ＿Ｒａｎｇｉｎｇ．ｒｅｓｐｏｎｓｅプリミティブは、Ｍ＿Ｒａｎｇｉｎｇ．ｉｎｄｉｃａｔｉｏｎプリミティブを受信した後、その結果を通知することに決定した時点に生成される。

3) Generation time M_Ranging. The response primitive is M_Ranging. After receiving the indication primitive, it is generated when it is decided to notify the result.

4) Effect upon reception The MAC layer is M_Ranging. The RNG-RSP and the MAC management message including the parameter received by the indication primitive are transmitted.

(10) M_Ranging. confirmation primitive 1) Function M_Ranging. The confirmation primitive notifies the upper management entity of the result included in the ranging response message.

2) Semantics M_Ranging. confirmation
{
MSAddress,
ResultCode,
ManagementCIDs,
Resource Retain Flag,
HO Process Optimization,
Location Update Response,
Paging Information,
Paging Controller ID,
Next Periodic Ranging
}
The table below shows M_Ranging. An example of a data format of a confirmation primitive is shown.

３）生成時点
Ｍ＿Ｒａｎｇｉｎｇ．ｃｏｎｆｉｒｍａｔｉｏｎプリミティブは、エアインタフェースを介してＭＡＣ層がＲＮＧ−ＲＳＰを受信するときに生成される。

3) Generation time M_Ranging. The confirmation primitive is generated when the MAC layer receives the RNG-RSP over the air interface.

4) Effect upon reception The result of distance measurement is notified to the upper management entity.

  In order to implement the various features, the present invention includes various types of hardware and / or software components (modules). For example, various hardware modules include various circuits and components required to perform method steps for scanning in a broadband wireless access system. Also, the various software modules (executed by the processor and / or other hardware) contain the various codes and protocols required to perform the method steps of the present invention.

  The present invention provides a handover execution method initiated by a mobile station for handover (MS MAC perspective), which includes a first primitive indicating a handover request from the NCMS of the mobile station (MS). Receiving a handover request message to the network, receiving a handover response message from the network, and sending a second primitive indicating handover confirmation to the NCMS of the MS. . The method further includes performing a heterogeneous network handover between at least one POA using the first and second primitives indicating a target POA (Point-of-Attachment) of different types of networks. The method includes receiving a third primitive indicating a handover execution instruction request from the NCMS of the MS, transmitting a handover instruction message to the network, and confirming a handover execution instruction to the NCMS of the MS. Transmitting a fourth primitive. The method further includes performing a heterogeneous network handover between at least one POA utilizing the third and fourth primitives that indicate target POAs of different types of networks. The first primitive or the handover request message includes a target candidate. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The first primitive includes a recommended number of POAs, a POA identifier (for example, a MAC address), a radio signal quality of the corresponding POA (for example, CINR mean, RSSI, etc.), a HO mode, and a current link action. At least one of the following. The HO mode indicates whether to perform HO before blocking the current link or to block the current link before performing HO. The current link action includes whether to disconnect the current link, whether to reduce the power of the link, whether to power down the link, whether to perform no action on the link, Whether to perform link resource maintenance, whether to perform a data forwarding request, whether to perform a bicast request, or whether to perform a handoff cancel Indicates whether or not to perform. The handover response message or the second primitive includes a target candidate. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The handover response message or the second primitive includes a recommended number of POAs, HO process optimization, HO ID, POA identifier, radio signal quality of the corresponding POA, link resource maintenance, data forward request, It includes at least one of a bicast request, handoff cancellation, and HO abort / fail reason. The HO process optimization indicates whether the previous IP address can be used for the target POA. The HO ID is used for improved HO ranging. The third primitive or the handover instruction message includes a target candidate. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The third primitive or the handover instruction message includes a HO instruction type. The HO indication type includes HO, HO cancellation, or HO rejection. The third primitive or the handover instruction message may indicate whether the current link is disconnected, whether the link is powered down, whether the link is powered down, or any action on the link. It includes a current link action that indicates whether or not to perform link resource maintenance, whether to perform a data forward request, whether to perform a bicast request, or whether to perform handoff cancellation. The fourth primitive includes a result code indicating success or failure of a result of message transmission to the network.

  The present invention provides a network-initiated handover execution method for handover (network / BS NCMS perspective), which receives a handover request message from the MAC layer of a mobile station (MS) Transmitting a first primitive indicating a handover execution instruction to the NCMS of the network; receiving a second primitive indicating a handover execution response from the NCMS of the network; and handover to the MAC layer of the MS Sending a response message. The NCMS of the network is a hierarchy that supports the management function of the mobile station and exists in an independent entity that is a management entity. The method further includes performing a heterogeneous network handover between at least one POA utilizing the first and second primitives indicating target POAs of different types of networks. The first primitive or the handover request message includes a target candidate. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The first primitive or the handover request message includes at least one of a recommended number of POAs, a POA identifier, a radio signal quality of the POA, a HO mode, and a current link action. The HO mode indicates whether to perform HO before blocking the current link or to block the current link before performing HO. The current link action includes whether to disconnect the current link, whether to reduce the power of the link, whether to power down the link, whether to perform no action on the link, Indicates whether to perform link resource maintenance, whether to perform a data forward request, whether to perform a bicast request, or whether to perform handoff cancellation. The handover response message or the second primitive includes a target candidate. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The handover response message or the second primitive includes a recommended number of POAs, HO process optimization, HO ID, POA identifier, radio signal quality of the corresponding POA, link resource maintenance, data forward request, bicast request, handoff. Includes at least one of cancellation and HO interruption / failure reason. The HO process optimization indicates whether the previous IP address can be used for the target POA. The HO ID is used for improved HO ranging.

  The present invention provides a handover execution method initiated by a mobile station for handover (MS MIH perspective), which transmits a first primitive indicating a handover request to the NCMS of the mobile station (MS). And receiving a second primitive indicating handover confirmation from the NCMS of the MS. The method further includes performing a heterogeneous network handover between at least one POA utilizing the first and second primitives indicating target POAs of different types of networks. The method further includes deferring reception of the second primitive to retransmit the first primitive as necessary prior to the receiving step. Such holding is performed using a timer. The first primitive includes a target candidate. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The first primitive includes at least one of a recommended number of POAs, a POA identifier, a radio signal quality of the corresponding POA, a HO mode, and a current link action. The HO mode indicates whether to perform HO before blocking the current link or to block the current link before performing HO. The current link action includes whether to disconnect the current link, whether to reduce the power of the link, whether to power down the link, whether to perform no action on the link, Indicates whether to perform link resource maintenance, whether to perform a data forward request, whether to perform a bicast request, or whether to perform handoff cancellation. The second primitive includes target candidates. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The second primitive includes a recommended number of POAs, HO process optimization, HO ID, POA identifier, radio signal quality of the corresponding POA, link resource maintenance, data forward request, bicast request, handoff cancellation, and HO interruption / Includes at least one of the reasons for failure. The HO process optimization indicates whether the previous IP address can be used for the target POA. The HO ID is used for improved HO ranging. The method further includes transmitting a third primitive indicating a handover execution instruction request to the NCMS of the MS and receiving a fourth primitive indicating confirmation of a handover execution instruction from the NCMS of the MS. The method further includes performing a heterogeneous network handover between at least one POA utilizing the third and fourth primitives that indicate target POAs of different types of networks. The third primitive includes target candidates. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The third primitive includes a HO indication type. The HO indication type includes HO, HO cancellation, or HO rejection. The third primitive determines whether to disconnect the current link, whether to reduce the power of the link, whether to power down the link, whether to perform any action on the link, It includes a current link action that indicates whether to perform link resource maintenance, whether to perform a data forward request, whether to perform a bicast request, or whether to perform handoff cancellation. The fourth primitive includes a result code indicating success or failure of a result of message transmission to the network. The method further includes configuring an integrated interface to a higher layer of a mobile station that manages messages to at least one of the homogeneous network and the heterogeneous network and messages from at least one of the homogeneous network and the heterogeneous network.

  The present invention provides a network-initiated handover execution method for handover (in terms of network MIH), the method receiving a first primitive indicating a handover request from the NCMS of the network; Transmitting a second primitive indicating handover confirmation to the NCMS of the network. The method further includes performing a heterogeneous network handover between at least one POA utilizing the first and second primitives indicating target POAs of different types of networks. The first primitive includes a target candidate. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The first primitive includes at least one of a recommended number of POAs, a POA identifier, a radio signal quality of the corresponding POA, a HO mode, and a current link action. The HO mode indicates whether to perform HO before blocking the current link or to block the current link before performing HO. The current link action includes whether to disconnect the current link, whether to reduce the power of the link, whether to power down the link, whether to perform no action on the link, Indicates whether to perform link resource maintenance, whether to perform a data forward request, whether to perform a bicast request, or whether to perform handoff cancellation. The second primitive includes target candidates. The target candidate includes at least one POA. The POA includes a base station (BS) or an access point (AP). The second primitive includes a recommended number of POAs, HO process optimization, HO ID, POA identifier, radio signal quality of the corresponding POA, link resource maintenance, data forward request, bicast request, handoff cancellation, and HO interruption / Includes at least one of the reasons for failure. The HO process optimization indicates whether the previous IP address can be used for the target POA. The HO ID is used for improved HO ranging. The method further includes configuring an integrated interface to an upper layer of the network that manages messages to at least one of the homogeneous network and the heterogeneous network, and messages from at least one of the homogeneous network and the heterogeneous network.

  This specification describes various embodiments of the invention. The claims are intended to cover all of the various modifications and equivalent devices of the embodiments disclosed herein. Accordingly, the claims should be construed broadly to cover modifications, equivalent constructions, and features within the spirit and scope of the disclosed invention.

The accompanying drawings, which are included to aid the understanding of the present invention and constitute a part of this specification, illustrate various embodiments of the present invention and together with the description, explain the principles of the invention.
It is a figure which shows the protocol layer structure of a broadband wireless access system. It is a figure which shows the procedure of the handover execution in the conventional broadband wireless access system. It is a figure which shows the protocol structure model in consideration of media independent handover (MIH). It is a figure which shows the primitive operation | movement principle by this invention. It is a figure which shows the primitive operation | movement principle by this invention. It is a flowchart which shows one Embodiment of this invention. It is a flowchart which shows other embodiment of this invention.

Claims (11)

A method for performing a handover procedure performed between an entity including a management plane and a data plane and an NCMS (Network Control Management System), wherein both the entity and the NCMS are in a single mobile station The method is performed by the entity in the mobile station;
The method
Receiving a handover request primitive from the NCMS in the mobile station and requesting transmission of a mobility handover request message (MOB_MSHO-REQ) to a serving base station;
Transmitting the mobility handover request message (MOB_MSHO-REQ) to the serving base station;
receiving a mobility handover response message (MOB_BSHO-RSP) from the serving base station;
In response to the handover request primitive, sending a handover response primitive to the NCMS in the mobile station;
Including
The NCMS interfaces with the entity via C-SAP or M-SAP, and the M-SAP is used to perform system configuration, monitoring statistics, notification / trigger, and the C-SAP. A method used for performing handover, idle mode mobility management, subscriber and session management, and radio resource management. The method of claim 1, wherein the handover request primitive includes a list of candidate target base stations and a number of candidate target base stations. Receiving a handover indication primitive from the NCMS and requesting to start a handover procedure, wherein the handover indication primitive includes a target base station ID and a message type, and a handover start or handover Steps performed by said entity representing at least one of cancellations;
transmitting a mobility handover indication message (MOB_HO-IND) to the serving base station and initiating the handover procedure, the steps performed by the entity;
The method of claim 2 further comprising: The method of claim 1, wherein the entity and the NCMS support a media independent handover function. A method for performing a handover procedure performed between an entity including a management plane and a data plane and an NCMS (Network Control Management System), wherein both the entity and the NCMS are in a serving base station, The method is initiated by the NCMS,
The method
sending a handover request primitive from the NCMS to the entity to request the entity to transmit a mobility handover request message (MOB_BSHO-REQ) to the mobile station;
In response to receiving the handover request primitive, transmitting the mobility handover request message (MOB_BSHO-REQ) from the entity to the mobile station;
Receiving a mobility handover indication message (MOB_HO-IND) from the mobile station by the entity;
Sending another primitive to the NCMS to indicate receipt of the mobility handover indication message (MOB_HO-IND) at the entity;
Including
The NCMS interfaces with the entity via C-SAP or M-SAP, and the M-SAP is used to perform system configuration, monitoring statistics, notification / trigger, and the C-SAP. A method used for performing handover, idle mode mobility management, subscriber and session management, and radio resource management. The method of claim 5, wherein the entity and the NCMS support a media independent handover function. A mobile station performing a handover procedure,
The mobile station
An entity comprising a management plane and a data plane, the entity configured to support IEEE 802.16 functionality;
NCMS (Network Control Management System) configured to cooperate with the entity and to support network control management functions;
Including
The entity is
Receiving a handover request primitive from the NCMS in the mobile station and requesting transmission of a mobility handover request message (MOB_MSHO-REQ) to a serving base station;
Transmitting the mobility handover request message (MOB_MSHO-REQ) to the serving base station;
receiving a mobility handover response message (MOB_BSHO-RSP) from the serving base station;
In response to the handover request primitive, sending a handover response primitive to the NCMS in the mobile station;
Is further configured to
The NCMS is a mobile station that interfaces with the entity via at least one SAP (system access point) interface. The SAP interface is a C-SAP (control service access point) responsible for handling functions including handover, mobility management, session management, and radio resource management, or system configuration, monitoring statistics, The mobile station according to claim 7, which is a management service access point (M-SAP) that handles a handling function including notification / trigger provision. The mobile station according to claim 7, wherein the handover request primitive transmitted by the NCMS includes a list of candidate target base stations and a number of candidate target base stations. The NCMS transmits a handover indication primitive to the entity, and then the entity transmits a mobility handover indication message (MOB_HO-IND) to the serving base station to start the handover. The movement according to claim 7, wherein the handover indication primitive includes a target base station ID and a message type and represents at least one of handover initiation or handover cancellation. Bureau. The mobile station according to claim 7, wherein the NCMS and the entity are configured to support a media independent handover function.

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