KR20120028190A - Method, apparatus and system to provide multicast service in a communication system - Google Patents

Abstract

PURPOSE: A multicast service providing method and a method thereof are provided to supply a multicast service by using a multicast group ID, MFID, and FID. CONSTITUTION: A BS(Base Station) determines a multicast service(211). The BS determines a service parameter, an MFID(Multi Flow Identification), and a multicast group ID through a DSA(Dynamic Service Allocation) process(213). The base station transmits an AAI DSA-REQ message to an MS(Mobile Station)(215). The base station receives an AAI DSA-RSP message from a terminal(217).

Description

METHOD, APPARATUS AND SYSTEM TO PROVIDE MULTICAST SERVICE IN A COMMUNICATION SYSTEM}

The present invention relates to a method, apparatus and system for providing a multicast service in a communication system.

The next generation communication system is evolving to provide various high-speed high-capacity services to mobile terminals (MS). Representative examples of next-generation communication systems include the Institute of Electrical and Electronics Engineers (IEEE) 802.16 communication system and the Mobile Interoperability for Microwave Access (WiMAX) communication system.

In addition, an example of the IEEE 802.16 communication system is an IEEE 802.16m communication system. In the IEEE 802.16m communication system, a base station (BS) allocates resources to each of the MSs, and allocates resources to each of the MSs. Resource allocation information, i.e., an information element (IE), is transmitted to each of the MSs using a MAP message. Here, the resource allocation IE includes information on the location and size of the allocated resource, information on the modulation scheme and coding rate to be used for the allocated resource.

Meanwhile, in the IEEE 802.16m communication system, a base station can transmit data using a multicast scheme. In this case, the base station is called an enhanced multicast broadcast service (E-MBS). Multicast data can be transmitted using a multicast resource included in a zone.

However, in the current IEEE 802.16m communication system, only multicast data can be transmitted using the multicast resources included in the E-MBS area. There is no specific plan for this.

Accordingly, there is a need for a specific method for providing a multicast service in an IEEE 802.16m communication system.

The present invention proposes a method, apparatus and system for providing a multicast service in a communication system.

The method proposed in the present invention; A method of providing a multicast service of a base station in a communication system, comprising: a multicast group identifier (ID) used to uniquely distinguish a multicast service in an entire network, and a flow ID (FID :) provided when a multicast service is provided. and providing a multicast service using a multicast FID (MFID), which is a FID shared and mapped to all multicast group IDs.

The system proposed in the present invention; In a communication system, a multicast group identifier (ID) used to uniquely distinguish a multicast service in an entire network, a flow ID (FID: flow ID) assigned when a multicast service is provided, and all multicasts A base station providing a multicast service using a multicast FID (MFID), which is an FID shared and mapped to group IDs.

In the present invention, a multicast group identifier (ID: Identifier, hereinafter referred to as ID), a flow ID (FID: flow ID, hereinafter referred to as FID), and a multicast FID (MFID: multicast FID, MFID) To provide a multicast service.

1 is a diagram illustrating an internal structure of an IEEE 802.16m communication system according to an embodiment of the present invention.
2 is a flowchart illustrating an operation process of a base station in an IEEE 802.16m communication system according to an embodiment of the present invention.
3 is a flowchart illustrating an operation process of an MS in an IEEE 802.16m communication system according to an embodiment of the present invention.
4 is a diagram illustrating an internal structure of a base station in an IEEE 802.16m communication system according to an embodiment of the present invention.
5 is a diagram illustrating an internal structure of an MS in an IEEE 802.16m communication system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

The present invention proposes a method and apparatus for providing a multicast service in a communication system. In addition, the present invention provides a multicast group identifier (ID: Identifier, hereinafter referred to as ID), a flow ID (FID: flow ID, hereinafter referred to as FID), and a multicast FID (MFID: multicast FID, hereinafter). A method and apparatus for providing a multicast service using MFID) are provided.

In the present invention, it is assumed that the communication system is, for example, an Institute of Electrical and Electronics Engineers (IEEE) 802.16m communication system, and is not only the IEEE 802.16m communication system but also other such as a Mobile Interoperability for Microwave Access (WiMAX) communication system. The communication system may also use the method and apparatus for providing a multicast service proposed by the present invention.

1 is a diagram illustrating an internal structure of an IEEE 802.16m communication system according to an embodiment of the present invention.

Referring to FIG. 1, the IEEE 802.16m communication system includes at least one mobile station (MS) 102 and 104 and at least one access service network (ASN). 110, 118, and at least one connectivity service network (CSN) 122, 132.

Each CSN 122, 132 is a Home Network Service Provider (H-NSP) 130 or a Visited Network Service Provider (V-NSP) to which the corresponding MSs 102, 104 are registered. Included at 120 may be access to an Access Service Provider (ASP) network 124, 134, such as the Internet.

ASN 110 includes functional blocks that perform network functions for providing wireless access to users with MSs 102, 104. Specifically, ASN 110 establishes layer 1 and layer 2 connectivity with MSs 102 and 104 and layer 3 connection with NSPs 120 and 130 so that MSs 102 and 104 access the network. And it performs radio resource management for effective wireless communication of the MSs (102, 104). In addition, the ASN 110 provides functions such as ASN anchored mobility, CSN anchored mobility, paging, and ASN-CSN tunneling for mobility management. To this end, the ASN 110 includes one or more base stations 112, 114 that connect with the MSs 102, 104, and one or more ASN gateways 116 that connect with the NSPs 120, 130.

CSNs 122 and 132 include functional blocks that perform network functions to provide IP connectivity services to users possessing MSs 102 and 104. Specifically, CSNs 122 and 132 assign MSs 102 and 104 IP addresses and endpoint parameters for user sessions, support ASN-CSN tunneling and inter-CSN tunneling, and inter-ASN mobility. Manage.

First, in the IEEE 802.16m system, mobile terminals (hereinafter referred to as MSs) are classified into terminal IDs (STIDs: Station IDs, hereinafter referred to as STIDs). Each STID has a 4-bit FID. Have Here, the FID is an ID for identifying a service flow, and service-related parameters for each FID are allocated through a dynamic service allocation (DSA) process. Here, the service-related parameters include a type of service, a quality of service (QoS), a supportable service, and the like.

On the other hand, the base station or the MS will share the information of the service through the DSA process when the service to provide occurs. The base station transmits resource allocation information using the STID to allow the MS to provide the service so that the MS receives the resource allocation information for the resources allocated to the MS itself. Here, the resource allocation information is included in a map (MAP, hereinafter referred to as MAP) message.

On the other hand, the burst received by the MS includes an advanced generic medium access control (AGMH) header (hereinafter referred to as AGMH), wherein the AGMH is associated with the FID of the burst. Contains burst length information. The MS detects the FID included in the AGMH and checks the flow of the received burst using the detected FID. In addition, the MS performs an operation corresponding to flow information corresponding to the FID detected by the DSA process. In the IEEE 802.16m communication system, service classification and resource allocation are performed using STID and FID.

Meanwhile, in the IEEE 802.16m communication system, a base station can transmit data using a multicast scheme. In this case, the base station is called an enhanced multicast broadcast service (E-MBS). Multicast data can be transmitted using a multicast resource included in a zone.

However, in the current IEEE 802.16m communication system, only a multicast service can be transmitted using a multicast resource included in the E-MBS area.

Accordingly, the present invention proposes a specific method for providing a multicast service in an IEEE 802.16m communication system.

First, it is assumed that a group including MSs provided with the same multicast service, that is, a multicast group includes at least one MS, and for convenience of description, one multicast group includes a plurality of MSs. In addition, multicast groups are classified using a multicast group ID, and MSs included in the multicast group may receive a multicast service using the group ID. Here, the base station may notify the MSs included in the multicast group through the DSA process as an example of the multicast group ID. Of course, the base station may notify the MSs included in the multicast group of the multicast group ID through a process other than the DSA process.

Meanwhile, in the IEEE 802.16m communication system, an FID is implemented as 4 bits, for example, and the IEEE 802.16m communication system is assumed to use 16 FIDs as an example. In addition, the multicast service is a service provided by multiple MSs, and the MSs provided with the multicast service should have the same multicast group ID and FID. However, it is difficult to generate a multicast group ID and match the FIDs of all MSs provided with the multicast service in the situation where each MS uses the FID for the STID.

Accordingly, the present invention proposes a method of mapping a multicast group ID, MFID, and FID to provide a multicast service. Here, the multicast group ID can be independently recognized in the entire network, and the multicast group ID, MFID, and FID mapping are performed through a DSA process.

On the other hand, the multicast service is a service provided to multiple MSs equally, and when the MSs receiving the same multicast service are distributed to multiple base stations, each of the plurality of base stations has the same multicast group ID. To provide the same multicast service. Therefore, when the MS performs a handover operation or a network reentry operation, there is no need to perform a separate update process. The multicast group ID proposed by the present invention can be defined as shown in Table 1 below.

Multicast Group Identifier A 16-bit value that is used to uniquely indentify a multicast service in entire network.

In Table 1, the multicast group ID may be implemented in 16 bits, for example, and is used to uniquely distinguish a multicast service in the entire network.

In addition, the present invention proposes a method for providing a multicast service using MFID, FID, and multicast group ID. Here, the MFID is an FID shared and mapped to all multicast group IDs. That is, the MFID is an FID assigned when a multicast service is provided, and the multicast service flow can be distinguished using the MFID. The MFID proposed by the present invention can be defined as shown in Table 2 below.

MFID FID for Multicast connection, called MFID, is used along with a 16-bit Multicast Group ID to uniquely identify a specific Multicast flow in entire network.

In Table 2, MFID is used together with a multicast group ID implemented with 16 bits as an example, and is used to uniquely distinguish a multicast flow in the entire network.

In addition, multicast services are provided in units of multicast groups, and multicast group and multicast service assignment is performed through a DSA process. In the case of a group call such as a multicast service, it is possible to service through a plurality of groups, so the DSA process should be able to map multiple multicast group IDs to one MFID.

In the IEEE 802.16m communication system, the multicast group ID and the MFID must be mapped in the DSA process. In this case, in order to be able to map a plurality of multicast group IDs to one MFID, the evolved air interface (Table 3) AAI: Advanced Air Interface, hereinafter referred to as AAI) _DSA-Request (REQ: request, hereinafter referred to as REQ) message, and AAI_DSA-Response (RSP: hereinafter referred to as RSP) in Table 4 below. Message and the AAI_Dynamic Service Change (DSC) -REQ message shown in Table 5 below.

M / O Attributes / Array of attributes Size (bit) Value / Note Condition … .. O Num of Multicast Group ID 4 Number of Multicast group to add Present when Num of Multicast Group ID> 0 M Multicast Group ID 16 ID of a group to which the flow is added Present when Num of Multicast Group ID> 0 O MFID 4 Flow of Multicast Groups
The MFID is mapped to FID. Present when Num of Multicast Group ID> 0

In Table 3, Num of Multicast Group ID represents the number of multicast group IDs, Multicast Group ID represents a multicast group ID of a multicast group to which a flow is added, and MFID represents a flow of multicast groups.

M / O Attributes / Array of attributes Size (bit) Value / Note Condition … .. O Num of Multicast Group ID 4 Number of Multicast group to add Present when Num of Multicast Group ID> 0 M Multicast Group ID 16 ID of a group to which the flow is added Present when Num of Multicast Group ID> 0 O MFID 4 Flow of Multicast Groups
The MFID is mapped to FID. Present when Num of Multicast Group ID> 0

M / O Attributes / Array of attributes Size (bit) Value / Note Condition … .. O Num of Multicast Group ID to add 4 Number of Multicast Group IDs to add Present when ABS initiates AAI_DSC-REQ
Present only if Num of Multicast Group ID to add> 0 M Multicast Group ID to be added 16 Multicast Group ID to be added Present only if Num of Multicast Group ID to add> 0 O MFID 4 Flow of newly added Multicast Groups
The MFID is mapped to FID. Present when Num of Multicast Group ID to add> 0 O Num of Multicast Group ID to delete 4 Number of Multicast Group IDs to delete Present when ABS initiates AAI_DSC-REQ
Present only if Num of Multicast Group ID to delete> 0 M Multicast Group ID to be deleted 16 Multicast Group ID to be deleted Present only if Num of Multicast Group ID to delete> 0

In Table 5, Num of Multicast Group ID to add represents the number of added multicast group IDs, Multicast Group ID to be added represents a multicast group ID to be added, and MFID represents a flow of newly added multicast group IDs. Num of Multicast Group ID to delete indicates the number of multicast group IDs removed, and Multicast Group ID to be deleted indicates a multicast group ID to be removed.

On the other hand, the base station transmits the AGMH with the FID in the case of the unicast service using the STID, and transmits the MFID in the AGMH in the case of the multicast service using the multicast group ID. Here, the format of the AGMH including the MFID is as shown in Tables 6 to 8, respectively.

The AGMH format is defined in Table 653. For E-MBS services, the FID shall be ignored by the receiver. For Multicast service, the FID shall be replaced by MFID.

In Table 6, Table 653 is a table described in IEEE 802.16m D8, which is a standard used in the IEEE 802.16m communication system, and describes a format of AGMH.

As shown in Table 6, in the AGMH format, it can be seen that the FID is ignored by the receiver in the case of the E-MBS, and the FID can be replaced by the MFID in the case of the multicast service.

The AGMH format is defined in Table 653. For E-MBS services, the FID shall be ignored by the receiver. For Multicast service, the FID shall be replaced by MFID of corresponding Multicast Group ID.

As shown in Table 7, in the AGMH format, it can be seen that the FID is ignored by the receiver in the case of the E-MBS, and in the case of the multicast service, the FID can be replaced with the MFID corresponding to the corresponding multicast group ID.

The AGMH format is defined in Table 653. For E-MBS services, the FID shall be ignored by the receiver. For Multicast service, the MFID associated with Multicast Group ID shall be used in FID field of AGMH.

As shown in Table 8, in the AGMH format, it can be seen that the FID is ignored by the receiver for the E-MBS, and in the case of the multicast service, the MFID associated with the multicast group ID can be used in the FID field included in the AGMH. have.

On the other hand, in order to be able to map one multicast group ID to one MFID in the embodiment of the present invention, unlike in Tables 3 to 5, the AAI_DSA-REQ message, the AAI_DSA-RSP message, and the AAI_DSC-REQ The message may be newly defined, and the AAI_DSA-REQ message, the AAI_DSA-RSP message, and the AAI_DSC-REQ message will be described below.

First, the format of the newly defined AAI_DSA-REQ message is shown in Table 9 below.

Field Size ( bit ) Value  Of Description Condition … .. For (i = 0; i <Num of Multicast Group ID; i ++) { Num of Multicast Group ID is the number of Multicast Group IDs to add
[1..16] Present when ABS initiates AAI-DSA-REQ
Present only if Num of Multicast Group ID> 0 Multicast Group ID 12 ID of a group to which the flow is added MFID 4 FID which is associated with Multicast Group IDs Present when Num of Multicast Group ID> 0 } … ..

Secondly, the format of the newly defined AAI_DSA-RSP message is shown in Table 10 below.

Field Size ( bit ) Value  Of Description Condition … .. For (i = 0; i <Num of Multicast Group ID; i ++) { Num of Multicast Group ID is the number of Multicast Group IDs to add
[1..16] Present when ABS initiates AAI-DSA-REQ
Present only if Num of Multicast Group ID> 0 Multicast Group ID 12 ID of a group to which the flow is added MFID 4 FID which is associated with Multicast Group IDs Present when Num of Multicast Group ID> 0 } … ..

Third, the format of the newly defined AAI_DSC-REQ message is shown in Table 11 below.

Attributes Of Array of  attributes Size ( bit ) Value  Of Note Condition … .. For (i = 0; i <Num of Multicast Group ID; i ++) { Num of Multicast Group ID is the number of Multicast Group IDs to add
[1..16] Present when ABS initiates AAI-DSC-REQ
Present only if Num of Multicast Group ID> 0 Multicast Group ID to be added 12 Multicast Group ID to be added MFID 4 FID which is associated with newly added Multicast Group IDs Present if N> 0 } For (i = 0; i <Num of Multicast Group ID; i ++) { Num of Multicast Group ID is the number of Multicast Group IDs to delete
[1..16] Present when ABS initiates AAI-DSC-REQ
Present only if Num of Multicast Group ID> 0 Multicast Group ID to be deleted 12 Multicast Group ID to be deleted } … ..

Next, an operation process of a base station in an IEEE 802.16m communication system according to an embodiment of the present invention will be described with reference to FIG. 2.

2 is a flowchart illustrating an operation process of a base station in an IEEE 802.16m communication system according to an embodiment of the present invention.

Referring to FIG. 2, in step 211, the base station determines a multicast service to be provided and proceeds to step 213. In step 213, the base station determines the service parameter, the MFID, and the multicast group ID through the DSA process, and proceeds to step 215. In step 215, the base station transmits an AAI_DSA-REQ message including the determined service parameter, MFID, and multicast group ID to the MS, and proceeds to step 217. In step 217, the base station receives an AAI_DSA-RSP message, which is a response message to the AAI_DSA-REQ message, from the MS and proceeds to step 219. In step 219, the base station transmits resource allocation information for the multicast burst, an information element including an multicast group ID (hereinafter, referred to as an IE), and the multicast burst to the MS. . In this case, the IE may be, for example, Broadcast Assignment A (advanced) -MAP IE, and the AGMH included in the multicast burst includes MFID instead of FID.

Next, an operation process of the MS in the IEEE 802.16m communication system according to an embodiment of the present invention will be described with reference to FIG. 3.

3 is a flowchart illustrating an operation process of an MS in an IEEE 802.16m communication system according to an embodiment of the present invention.

Referring to FIG. 3, in step 311, the MS receives an AAI_DSA-REQ message from a base station and proceeds to step 313. In step 313, the MS detects the service parameters related to the multicast service (including the multicast service type and the MFID), the MFID, and the multicast group ID from the received AAI_DSA-REQ message. In step 315, the MS checks whether there is a multicast group ID received through the Broadcast Assignment A-MAP IE in every sub-frame, and as a result of the check, the MS receives the message through the Broadcast Assignment A-MAP IE. If the multicast group ID exists, the MS proceeds to step 317. In step 317, the MS checks whether a multicast group ID identical to the multicast group ID received through the Broadcast Assignment A-MAP IE exists among the multicast group IDs detected from the AAI_DSA-REQ message.

If the multicast group ID identical to the multicast group ID received through the Broadcast Assignment A-MAP IE exists among the multicast group IDs detected from the AAI_DSA-REQ message, the MS proceeds to step 319. In step 319, the MS receives a multicast burst corresponding to the corresponding multicast group ID, and proceeds to step 321. In the case of the multicast burst, since the AGMH includes the MFID instead of the FID, the MS can detect the FID mapped to the MFID while performing the DSA process or the DSC process from the MFID included in the AGMH. In step 321, the MS performs a reception operation corresponding to the corresponding FID.

Next, an internal structure of a base station in an IEEE 802.16m communication system according to an embodiment of the present invention will be described with reference to FIG. 4.

4 is a diagram illustrating an internal structure of a base station in an IEEE 802.16m communication system according to an embodiment of the present invention. Referring to FIG. 4, the base station includes a control unit 411, a transmitting unit 413, and a receiving unit 415. The control unit 411 controls the overall operation of the base station, that is, various operations for providing a multicast service, and particularly generates various messages as described in Tables 3 to 5, and the like. The transmitting unit 413 transmits various messages generated by the control unit 411 to the MS under the control of the control unit 411. In addition, the receiving unit 415 receives various signals from the MS under the control of the control unit 411.

Meanwhile, although FIG. 4 illustrates a case in which the control unit 411, the transmitting unit 413, and the receiving unit 415 are implemented as separate units, the control unit 411 and the transmitting unit 413 are illustrated. And the receiving unit 415 may be integrated into one unit.

Next, the internal structure of the MS in the IEEE 802.16m communication system according to the embodiment of the present invention will be described with reference to FIG. 5.

5 is a diagram illustrating an internal structure of an MS in an IEEE 802.16m communication system according to an embodiment of the present invention.

Referring to FIG. 5, the MS includes a control unit 511, a receiving unit 513, and a transmitting unit 515.

The control unit 511 controls the overall operation of the MS. The receiving unit 513 processes the various signals and messages received from the base station, and outputs the received signals to the control unit 511. Various signals and messages received from the base station are the same as described above, so a detailed description thereof will be omitted. In addition, the transmitting unit 515 transmits various signals and messages to the base station under the control of the control unit 511.

5 illustrates a case in which the control unit 511, the receiving unit 513, and the transmitting unit 515 are implemented as separate units, the control unit 511 and the receiving unit 513 are illustrated. And the transmitting unit 515 may be integrated into one unit.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (2)

A method of providing a multicast service of a base station in a communication system,
Multicast group identifier (ID) used to uniquely distinguish multicast services in the entire network, flow ID (FID: flow ID) provided when providing multicast service, and shared to all multicast group IDs And providing a multicast service using a multicast FID (MFID: multicast FID), which is a mapped FID.
In a communication system,
Multicast group identifier (ID) used to uniquely distinguish multicast services in the entire network, flow ID (FID: flow ID) provided when providing multicast service, and shared to all multicast group IDs And a base station that provides a multicast service using a multicast FID (MFID: multicast FID), which is an FID that is mapped.

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