KR101651124B1 - A method for efficent MBS data transmission considering idle mode mobile stations - Google Patents

Abstract

The present invention proposes an efficient MBS data transmission method using feedback transmission and location update of terminals operating in an idle mode while receiving MBS (Multicast Broadcast Service), which is a service for transmitting multimedia data .

The method includes receiving a feedback code set for feedback from a serving base station and transmitting MBS data including uplink allocation information for transmitting a feedback on the MBS reception quality to the serving base station, Comparing the reception quality of the MBS data with a predetermined reception quality condition, and transmitting the feedback information to an MBS network of the serving base station to perform Adaptive Modulation and Coding (AMC) And transmitting one feedback code selected from the feedback codes to the serving BS using uplink resources indicated in the uplink allocation information according to the comparison result.

MBS, Idle mode, Feedback, Location update

Description

[0001] The present invention relates to an MBS data transmission method and an MBS data transmission method in consideration of terminals in an idle mode,

The present invention relates to a MBS (Multicast Broadcast Service), and more particularly, to a method for efficiently transmitting MBS data considering a UE entering an idle mode.

A terminal receiving a broadcast or a multicast broadcast service (MBS) in a wireless communication network obtains information on a service through higher-level procedures with a server providing the service to start the service. If the terminal decides to receive the service, the server delivers the data to the area to which the terminal belongs. The terminal can receive the service from the base station through the connection procedure with the base station located in the area to which the terminal belongs.

More specifically, in a broadband wireless access system, data transmission between a base station and a mobile station (MS) is performed through a "service flow ". The service flow includes a Service Flow Identifier (SF ID) identifying the service flow between the base station and the MS, a CID (connection identifier) identifying the connection carrying the service flow traffic, ) And quality of service (QoS) parameters related to the quality of service.

In general, the service flow is formed by a one-to-one connection between the base station and the MS. However, the MBS used for transmitting MBS data in an IEEE 802.16 system features a point-to-multipoint service that transfers data from one source to multiple recipients. Therefore, the base station delivers the same data to multiple MSs through one service flow.

That is, when generating the MBS service flow of the base station and the MS, the base station grants the same CID to the MSs requesting MBS data reception so that the same MBS data can be simultaneously received by several MSs. The coverage that can provide service by giving one CID to several MSs is called MBS zone.

The MBS zone can be composed of several base stations. In a MBS zone, several base stations can provide the same service in a plurality of cells through one service CID. Because of this nature, the MBS typically delivers data common to multiple recipients across multiple base stations from one source.

In order to start the MBS service, the UE establishes a connection with the BS through a dynamic service addition (DSA) process. Through the connection setup, the user receives the connection identifier and QoS information.

Among the information used for the MBS, the configuration of the MBS_MAP message is shown in Table 1 below.

The MBS_MAP message is information to be transmitted from the BS to the MS to receive the MBS service, and may include information for reading the MBS service. The MS receiving the MBS_MAP message can confirm the service point of the MBS through the additional information such as MBS_DATA_IE or Extended_MBS_DATA_IE.

The MBS_DIUC_Change_Count field may be used to indicate a change in the burst profile used for multi-base station MBS data. If MBS_DIUC_Change_Count is changed, the terminal shall wait until the DCB message is received unless the DL burst profile TLV is included in the MBS_MAP.

The MBS_DATA_IE designates an area to which the current MBS data is allocated and an area to which the MBS data is to be allocated next. This allows the user to receive data at the present time and to know the allocation area to be read next time.

Next, the idle mode will be described.

The idle mode is a mechanism that enables the UE to periodically receive the downlink broadcast traffic transmission without registering in a specific base station even if the UE wanders a wireless link environment composed of multiple base stations (BSs) over a wide area. That is, the terminal in the idle mode does not have to comply with the requirements for handover or general MAC operation.

However, the mobile station in the idle mode may check whether it is called from the base station at predetermined time intervals. Thus, the idle mode provides a simple and appropriate way to notify for pending downlink traffic to the terminal, and removes the air interface and network handover traffic from the inactive terminal, .

Further, in the idle mode, the terminal operates in a discrete period, thereby saving power and operating resources. The idle mode terminal returns all connection identifiers (CIDs), management CIDs (MCIDs), and Internet Protocol (IP) addresses.

Hereinafter, an example of a procedure in which the UE enters the idle mode and operates in the conventional IEEE 802.16e system will be described with reference to FIG.

Referring to FIG. 1, a UE initially transmits a de-registration request (hereinafter referred to as "DREG-REQ") message to a serving BS to enter an idle mode in a normal mode (S110).

The serving BS receiving the DREG-REQ message may exchange information of the MS and the serving BS in a paging controller (S120).

Next, the serving base station may transmit a de-registration command (hereinafter referred to as "DREG-CMD") to the terminal (S130).

Upon receiving the DREG-CMD message from the serving base station, the UE confirms that the request to enter the idle mode has been successfully accepted, and enters the idle mode (S140).

 The paging controller can perform a paging procedure to find a terminal when a call to the terminal or an external packet is received (S150) (S160).

Here, the paging procedure refers to informing a corresponding terminal of the presence of traffic so that the terminal can wake up and receive downlink data traffic for a specific terminal in the idle mode. The downlink traffic for this particular terminal may be pending via a base station or a specific network entity.

For this, the paging controller can inform the serving base station of the arrival of the traffic using the information stored in the step of exchanging the information of the terminal and the serving base station (S120). Accordingly, the serving BS can transmit a paging message (MOB_PAG-ADV) informing the terminal of the arrival of the traffic.

Upon receiving the paging message from the serving base station, the mobile station checks the message and enters the normal mode when it has paged itself (S170), thereby performing communication with the base station (S180). A terminal that enters the normal mode can communicate with a base station.

In addition, when the UE moves to another cell located in the same MBS zone in the idle mode, the UE does not newly establish a connection for MBS. However, if the UE moves to another MBS zone, it can receive the MBS by resetting the connection for MBS.

However, when transmitting the MBS data in the mobile communication network, the MBS network needs a level of modulation and coding (MCS) that all terminals receiving the MBS data in the cell can receive error- Scheme).

Here, the MBS network refers to an entity that receives data from an MBS content provider and distributes MBS data to a serving base station in charge of the terminal, so that the MBS data can be transmitted to a terminal receiving the service. Typical examples include an MBS server, an MBS gateway, or an MBS controller.

In a typical MBS transmission scheme, since no feedback is provided to the MBS network, a service can be provided to a terminal using a data rate lower than necessary. This leads to waste of wireless resources by inefficiently using the available radio resources of the entire network system. Therefore, an appropriate method for providing the feedback on the reception quality of the multimedia data to the MBS network is required even in the idle mode.

Also, when the terminal stops receiving the service, it needs to notify the MBS network of the discontinuation of the service and recover the network resource that is no longer used.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art, and it is an object of the present invention to provide an MBS network in which a UE entering an idle mode notifies a MBS network of a reception quality of a service, And to provide a method for a base station to efficiently transmit MBS data.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, There will be.

According to an aspect of the present invention, there is provided a feedback transmission method for supporting efficient MBS transmission, comprising: receiving MBS data including uplink allocation information for feedback transmission from a serving base station; And transmitting a predetermined feedback code to the serving BS using uplink resources indicated in the uplink allocation information.

At this time, the predetermined feedback code is one selected from a feedback code set transmitted from the serving base station, and the feedback code set is transmitted by the serving base station to one of initial ranging codes Or more.

In addition, the feedback code set is a set of one or more feedback codes for NACK feedback, and the step of transmitting the predetermined feedback code is a step of transmitting a feedback code, Is satisfied.

The feedback code set may further include a feedback code for positive acknowledgment (ACK) feedback and negative feedback (NACK) feedback selected by the serving base station, and the step of transmitting the predetermined feedback code includes receiving Wherein one of the feedback codes is performed in the feedback code set according to whether a quality satisfies a reception quality condition for feeding back a predetermined acknowledgment (ACK) and a reception quality condition for feeding back a negative response (NACK) .

Also, the UE may acquire uplink allocation information for the feedback transmission using a feedback channel pointer IE.

Also, the feedback channel pointer information element may be included in a private MAP, a multicast control channel (MCCH), and a broadcast control channel (BCH).

Also, in a multi-carrier environment, the feedback channel pointer IE is transmitted on a first carrier and indicates an uplink resource allocated for the feedback transmission of the second carrier .

In addition, the first carrier is an MBS dedicated carrier,

The second carrier may be a primary carrier.

According to another aspect of the present invention, there is provided a feedback receiving method for supporting efficient MBS transmission, comprising: transmitting a feedback code set for feedback and a preset reception quality condition to the terminal; The method includes receiving MBS data including uplink allocation information for transmission from the MS, receiving the feedback code from the MS through an uplink resource indicated by the uplink allocation information, And transmitting the feedback information corresponding to the feedback information to the MBS network.

At this time, the feedback code set may be transmitted to the terminal through a broadcast control channel (BCH).

In addition, the feedback code set is a set of one or more feedback codes for feeding back a negative acknowledgment (NACK), and the predetermined reception quality condition may be a reception quality condition in which the terminal feedbacks a negative response.

In addition, the step of transmitting the feedback information corresponding to the received feedback code to the MBS network may include the step of, if any one of the one or more feedback codes for feedback of the NACK is received from the terminal, And feedback information indicating that the reception quality condition for feeding back the response is satisfied is transmitted to the MBS network.

According to another aspect of the present invention, there is provided a location update method for supporting efficient MBS transmission, the method comprising: obtaining a location update condition for MBS reception quality feedback; And transmitting, to the serving base station, a ranging request message for location update, the ranging request message including specific information required for the MBS network to take a corresponding action when it is transmitted to the network.

At this time, the predetermined location update condition is a negotiation process using the DREQ-REQ message and the DREG-CMD message with the serving base station at the time of entering the idle mode. It may be acquired.

Also, the negotiation process may be performed through a DREQ-REQ message and a DREG-CMD message.

In addition, the preset location update condition may be any one of an MBS reception quality condition, a predetermined period of time, and an MBS reception stop.

In addition, when the preset condition is the MBS reception quality condition or the predetermined period, the specific condition may include mobility information of the terminal, a preferred modulation and coding scheme (MCS) level of the terminal, And MBS reception quality information.

Also, the mobility information of the terminal includes at least one of a speed, a moving direction and a current coordinate value of the terminal, and the MBS reception quality information includes an average received signal-to-noise ratio (SNR) and a received signal strength And an indicator (RSSI).

In addition, the corresponding measures taken by the MBS network include grasping a moving area of the mobile station using the mobility information, performing adaptive modulation and coding (AMC) using the MCS level preferred by the user equipment and the MBS data reception quality information And an AMC operation in which a moving area of the terminal in combination with the two measures is considered.

In addition, when the preset condition is an elapse of a predetermined period, the MBS data reception quality information may be measured during a recent part of the predetermined period.

In addition, if the preset location update condition is an MBS reception stop, the corresponding action taken by the MBS network may be to recover network resources allocated for the UE.

A location update method for receiving efficient MBS transmission according to another aspect of the present invention includes: transmitting a predetermined location update condition to the MS; and transmitting the location update condition to the MS when the MBS network transmits a corresponding update Receiving from the MS a ranging request message including specific information required to receive the specific information, and transmitting the specific information to the MBS network.

According to the present invention, a terminal receiving an MBS service in an idle mode can efficiently use radio resources by notifying the MBS network of a quality of service or information on a service reception state change through feedback transmission or location update.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for informing a network of a reception quality of a MBS data and whether a reception state is changed by a terminal.

In the following embodiments, elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features.

The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

Herein, embodiments of the present invention have been described with reference to a data transmission / reception relationship between a base station and a terminal. Here, the BS has a meaning as a terminal node of a network that directly communicates with the MS. The specific operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. The term 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), and Mobile Subscriber Station (MSS).

Embodiments of the present invention may be implemented by various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For a hardware implementation, the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to embodiments of the present invention may be implemented in the form of a module, a procedure or a function for performing the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

A Multicast Broadcast Service (MBS) or MBS service (MBS) is associated with a service flow. The MBS service flow is not dedicated to a specific terminal and can be transmitted from the base station to the terminal irrespective of the mode of the terminal.

At the start of the service, the base station can establish the MBS service by creating the MBS service flow. The mapping of the MBS service flow identifier (MBS SFID) to the connection indicator (CID) is notified to all base stations belonging to the same MBS zone. When the terminal is registering with the base station to receive the MBS service, the terminal must initiate a Dynamic Service Addition (DSA) procedure for the MBS service to inform the base station that the terminal is a customer of the particular MBS service . To this end, the mobile station transmits and receives control information to and from the base station via a message (DSA-REQ / DSA-RSP / DSA-ACK).

Through the transmission and reception of control information using the messages, the UE acquires an encryption key for MBS data reception and a connection identifier (CID) for radio resource mapping. The information thus obtained is used to initiate bidirectional upper layer communication between the base station and the backbone network when the MBS service is configured. If the MBS service is successfully configured, the terminal may reuse the same configuration without reconfiguration when moving to another base station.

First Embodiment

The first embodiment of the present invention provides a method for transmitting a service request message to a serving base station by including the idle mode entry request information in a service request message.

FIG. 2 is a diagram illustrating a fast MBS service connection and idle mode entry procedure according to the first embodiment of the present invention.

Referring to FIGS. 2 (a) and 2 (b), a mobile station attempts to enter an idle mode in the same procedure while performing a connection procedure for a specific MBS service. To do so, the UE may transmit an MBS service request message including information for requesting the idle mode entry to the serving BS (S210).

The MBS service request message is preferably a Dynamic Service Addition REQuest (DSA-REQ) message. Hereinafter, in the present embodiment, the MBS service request message is regarded as DSA-REQ.

An example of the form in which the idle mode entry request information is included in the service request message (DSA-REQ) will be described in more detail with reference to Tables 2 to 4 below.

Syntax Size (size) Remarks DSA-REQ_Message_Format () {   Management Message Type = 11 8 bits   Transaction ID 16 bits   TLV Encoded Information variable TLV specifics }

Table 2 above shows the format of the DSA-REQ message, and it can be seen that TLV encoded information (TLV encoded information) can be included. The DSA-REQ message may be added to the service flow encoding as shown in Table 3 below.

Type Parameter One Service Flow Identifier 2 CID 3 Service Class Name 4 Reserved MBS service 5 QoS Parameter Set Type ... . ... . 49 Idle Mode support

Referring to Table 3, the idle mode entry request information may be included in the service flow encoding, and may be added to the type field 49, for example. Previously, Type 49 is used for PSC assignment, but in the present embodiment, it can be modified as shown in Table 4 below to include idle mode entry request information.

Type Length Value Scope [145/146] .49
1.49 One 0: idle mode support
1: no action DSA-REQ, DSA-RSP
REG-REQ, REG-RSP

Also, the DSA-REQ message may include information on a time point at which the UE desires to enter the idle mode. That is, the access point can inform the serving BS of whether the UE enters the idle mode immediately after the connection of the MBS service is established or enters the idle mode after a predetermined time thereafter. The predetermined time may be displayed in the form of an offset based on the transmission or reception time of the DSA-REQ (S211).

In addition, the DSA-REQ message may further include information about a paging controller or information about a paging cycle. At this time, the information desired to be maintained by the paging controller may be operation information used by the terminal to quickly re-enter the network in the idle mode in the future.

If a paging group considering the mobile speed of the mobile station is supported in an environment composed of a plurality of base stations including a serving base station and a paging controller, the mobility information of the mobile station is included in the DSA-REQ message . ≪ / RTI > Here, the mobility information may include at least one of a moving speed, a moving direction and a current position of the terminal.

Also, a paging group refers to a group consisting of a plurality of base stations logically separated. The purpose of this group is to provide a neighbor coverage area in which a terminal can be pageed in downlink if there is no downlink traffic to the terminal although it is not necessary for the terminal to transmit predetermined data through the uplink.

It is desirable that the paging group satisfies the condition that the terminal is large enough to hold most of the time in the same paging group and must be small enough to maintain the paging load at an appropriate level.

Therefore, if the paging group is considered in consideration of the mobile speed of the mobile station, paging can be performed more efficiently when the mobility of the mobile station is known to the mobile station. Information on the mobility of the terminal can be calculated by the terminal itself when the terminal has the GPS module and can be provided to the base station by itself. Otherwise, the information can be calculated by receiving the location information from the base station.

Upon receiving the DSA-REQ message, the serving BS can transmit a service response message including response information to the idle mode access support information to the MS in response to the DSA-REQ message (S220). The service response message is preferably a Dynamic Service Addition Response (DSA-RSP) message. Hereinafter, in the present embodiment, the service response message is regarded as DSA-RSP.

The response information of the idle mode entry request information may indicate whether or not the serving base station should allow the idle mode entry request of the UE. If the DSA-REQ message includes information on a desired entry point of the idle mode, the serving BS may indicate whether to allow the UE to enter the idle mode at a desired time.

Also, if the response information for the idle mode entry request indicates that the UE can not enter the idle mode at the desired time, the DSA-RSP message is transmitted to the UE at least one of the reason And the like. A possible entry point may be indicated in the form of an offset based on the time at which the serving base station transmits the DSA-RSP message. For example, if the terminal desires to enter idle mode at the same time as the service connection, the service setting is permitted but the entry into the idle mode exceeds the maximum terminal capacity that can be handled by the paging controller It is assumed that it is rejected.

Accordingly, the serving BS can notify the MS that it is impossible to request an entry into the idle mode immediately after the service connection of the MS, and transmit the DSA-RSP message including the reason why it is impossible. Then, the serving BS can inform the terminal of the time when it can enter the idle mode by offset (S221).

Finally, the terminal transmits a service confirmation message to the serving base station, and performs a service connection and an idle mode entry operation according to the received response message (S230, S231). Here, the service confirmation message is preferably a Dynamic Service Addition acknowledgment (DSA-ACK) message.

Second Embodiment

The second embodiment of the present invention provides a method for transmitting a message for inquiring whether or not a serving BS establishes a specific MBS service connection to a terminal, including information for inquiring whether to enter an idle mode into a inquiry message.

FIG. 3 is a diagram illustrating a quick MBS service connection and idle mode entry procedure according to a second embodiment of the present invention.

Referring to FIG. 3, the serving BS attempts to allow an MS to enter an idle mode in the same procedure while performing an MBS service connection procedure. For this purpose, the serving BS can transmit a service request message to the one or more MSs that are likely to receive a specific MBS service in its coverage area, asking whether to establish connection of a specific MBS service.

At this time, the service request message may include idle mode support information for inquiring whether the terminal enters the idle mode (S310).

The service request message is preferably a dynamic service addition request (DSA-REQ) message. Hereinafter, in the present embodiment, the service connection request message is regarded as DSA-REQ. This can take the form as shown in Table 4 described in the first embodiment.

In addition, the DSA-REQ message may further include information about a time point at which one or more UEs enter the idle mode proposed by the serving BS. That is, it is possible to suggest to at least one terminal whether to allow the at least one terminal to enter the idle mode immediately after the connection of the MBS service is established or to enter the idle mode after a predetermined time therefrom. The predetermined time may be displayed in the form of an offset based on the transmission or reception time of the message (DSA-REQ).

If a paging group considering the mobile speed of the mobile station is supported in an environment composed of a plurality of base stations including a serving base station and a paging controller, the DSA-REQ message includes information about whether or not the paging group is supported Information, and may request mobility information from at least one terminal that has received the DSA-REQ message.

A terminal desiring connection of a specific MBS service among the terminals receiving the DSA-REQ message can transmit a service response message for the connection. At this time, the idle mode entry information indicating whether the idle mode is entered may be included in the service response message (S320).

The service response message for connecting the specific MBS service is preferably a dynamic service addition response (DSA-RSP) message. Hereinafter, in the present embodiment, the service response message is regarded as a DSA-RSP.

Also, the idle mode entry information may have a form of an idle mode support field in the service flow encoding as shown in Table 4, and the 49th type column may be used as described above.

Here, if the UE desires to enter at a time other than the idle mode entry point proposed by the serving BS, the UE may transmit the DSA-RSP message including the point-in-time information indicating an appropriate entry point requested by the UE to the serving BS.

That is, when the UE is receiving a specific MBS service but does not use another service, it is preferable not to switch to the idle mode. In this case, the UE sets the idle mode entry information to 1 (no action) Lt; / RTI >

In addition, when the UE enters the idle mode immediately after establishing a connection to a specific MBS service, idle mode entry information is set to 0 (idle mode support), and the DSA-RSP message can be transmitted to the serving BS. If the UE desires to enter the idle mode after a certain period of time due to the ongoing service or scheduled service, it may enter an idle mode after offset by transmitting an offset to the DSA-RSP message and transmitting the offset to the serving base station.

Also, it is assumed that the DSA-REQ message includes information on whether or not a paging group is supported in an environment where a paging group considering the mobile speed of the terminal is supported as described above, and is received in the terminal. At this time, the UE can transmit its mobility information to the serving BS by including it in the DSA-RSP message. The method of obtaining the mobility information can be assisted by the GPS or the base station as described in the first embodiment.

Next, the serving BS transmits a service confirmation message to the MS in response to the request of the MS (S330). The service confirmation message is preferably a dynamic service addition acknowledgment message (DSA-ACK). If the subscriber station transmits the DSA-RSP message including information on the idle mode entry time requested by the subscriber station in step S320, the serving BS determines whether the idle mode entry point requested by the subscriber station is permitted by the DSA-ACK message .

In this step, the serving BS may reject or modify the request of the MS, and the MS must follow the final message of the BS. If not, the UE may send a modified control message (DSC-REQ) to the serving BS to modify or reject the request of the final message of the serving BS.

Third Embodiment

The third exemplary embodiment of the present invention provides a method for transmitting an idle mode entry request message including an MBS service connection request information to an idle mode entry request message when the UE transmits an idle mode entry request message to a serving base station.

FIG. 4 is a diagram illustrating a procedure for connecting a fast MBS service and entering an idle mode according to a third embodiment of the present invention.

Referring to FIG. 4, a mobile station attempts to connect an MBS service in the same procedure while performing an entry procedure into an idle mode. To this end, the MS transmits MBS service connection request information to a message for requesting idle mode switching to the serving BS in step S410.

Preferably, the message for requesting idle mode switching is a DREG-REQ message. Also, the MBS service connection request information may be included in the message as a method of modifying a part of the DREG-REQ message format. This will be described with reference to Table 5 below. Table 5 shows an example of the DREG-REQ message format according to the third embodiment of the present invention.

Syntax size Remarks DREG-REQ message_Format () {   Management Message Type = 49 8 bits


De-Registration_Request_Code


8 bits 0x00 = SS deregistration request from BS and network
0x01 = MS request for deregistration from serving BS and initiation of idle mode
0x02 = MS response for unsolicited deregistration initiated by BS
0x03 = MS request for deregistration from serving BS and initiation of idle mode and connection request
0x04 ~ 0xFF = Reserved   TLV encoded parameters variable }

Referring to Table 5, contents such as "0x03 = MS request for deregistration from serving BS and initiation of idle mode and connection request" can be added to 0x03 although it is not used after 0x03 in general De-Registration_Request_Code syntax have. In this case, the MBS service connection request can be made in one procedure simultaneously with the idle mode entry request.

Upon receiving the deregistration request message including the MBS service connection request information, the serving base station can transmit an idle mode switching response message including the response information of the service connection request to the mobile station in response to the deregistration request message ). The idle mode switching response message is preferably a deregistration command (DREG-CMD).

In addition, the response information for the service connection request may include information such as a service flow parameter and a CS parameter encodings transmitted through a general service connection procedure.

In addition to the response information for the service connection request, the DREG-CMD message may further include information about an operation that the serving BS additionally requests to the terminal when the terminal is connected to the MBS service.

For example, if the reception quality of the MBS data is lower than a predetermined level, information requesting the terminal to perform location update may be included. Here, the location update is an operation of the terminal for increasing the hit ratio at the time of paging to the terminal that has entered the idle mode. In this case, when the terminal moves to a new area, .

In another example, the serving base station may cause the terminal to transmit feedback on the data reception quality of the MBS service to the serving base station. In addition, when the connection of the MBS service is terminated, the terminal may explicitly notify the serving base station of the termination of the service connection. Information on additional operation requests may also be included in the DREG-CMD message.

Next, the MS receives the DREG-CMD message from the serving BS, and performs connection establishment and idle mode entry of the MBS service (S430).

Fourth Embodiment

A fourth embodiment of the present invention provides a feedback transmission method for efficient MBS data transmission when a terminal receiving an MBS enters an idle mode. More specifically, in this embodiment, the terminal reports a contention based feedback code to the MBS network, thereby providing a method for the terminal to receive reliable MBS data do. This will be described with reference to FIG.

5 is a flowchart illustrating a feedback transmission procedure of a UE according to a fourth embodiment of the present invention.

Referring to FIG. 5, the terminal can perform connection establishment and idle mode entry of the MBS (S501).

MBS connection setting and idle mode entry may be performed simultaneously or in a single procedure as in the first to third embodiments described above. Also, in this procedure, the UE can receive the reception quality condition of the MBS data serving as a reference for feedback transmission of the UE from the serving BS. The reception quality condition may be a criterion for only negative feedback because of a negative acknowledgment and may be used as a criterion for ACK feedback when ACKnoledgement (hereinafter referred to as "ACK ") and NACK feedback are considered together. The criterion for the reference and the NACK feedback can be set respectively.

Then, the terminal may receive a feedback code set for feedback from the serving base station (S502).

Here, the feedback code set refers to a set of one or more CDMA codes selected by a serving base station among CDMA codes used for initial ranging. Hereinafter, the CDMA code included in the feedback code set is referred to as a "feedback code ". This feedback code set need not be separately selected when the UE feeds back only one of ACK and NACK. However, when both ACK and NACK are fed back, it is desirable to select one of feedback codes indicating ACK and one or more feedback codes indicating NACK.

The feedback code set can be allocated from the serving base station to the UE through a superframe header (SFH) or a broadcast control channel (BCH) have. This can be included in the BCH in the form of Tables 6 and 7 below.

Table 6 shows an example of a form in which a NACK feedback code set is included in the BCH or SFH when only NACK feedback transmission is considered.

Name Type Length Value NACK Feedback Code set Number of NACK Feedback CDMA code for MBS

Next, Table 7 shows an example of a form in which an ACK feedback code set and a NACK feedback code set in which ACK and NACK feedback transmission are considered together are included in the BCH or SFH.

Name Type Length Value  ACK Feedback code set  Number of ACK Feedback CDMA code for MBS  NACK Feedback code set  Number of NACK Feedback CDMA code for MBS

A UE included in the BCH or the SFH and having received the feedback code set in the form of Table 6 or Table 7 receives the information on the UL channel allocated by the serving BS to transmit the feedback code, Quot; uplink allocation information ") from the serving base station. This is because the terminal that enters the idle mode does not receive the resource allocation control channel (MAP) of the subframe or frame for instructing the allocation of data. At this time, the uplink allocation information may be included in every MBS data packet (or transmission unit), or may be included every predetermined period (S503).

The manner in which the uplink allocation information is included in the MBS data will be described later in more detail.

The terminal can receive the MBS data and judge whether there is an error (S504).

If it is determined that there is no error, the terminal can determine whether a predetermined reception quality condition is satisfied. To this end, the terminal can operate a predetermined counter for calculating an error ratio. If such a counter is used, the UE may first record no error in the counter, and then determine whether the reception quality condition is satisfied (506).

As a result of the determination of the reception quality condition, if the reception quality condition for the ACK feedback transmission is satisfied, the terminal can transmit an ACK feedback transmission to the base station (S507).

On the other hand, if the reception quality condition for the ACK feedback transmission is not satisfied as a result of the reception quality condition determination, the UE can continuously receive the next MBS data without feedback transmission (S508).

Of course, if only transmission of NACK feedback is considered, steps S506 and S507 may not be performed. However, even if transmission of only NACK feedback is considered, the UE can record no error in the counter for calculating the error ratio and receive the next MBS data.

If the terminal determines that the received MBS data is erroneous (S504), if there is an error, the subsequent process may be changed according to the content of the error. For example, if there is an error in reception of the MBS data itself including the uplink resource allocation information, or if there is a problem only in the uplink resource allocation information in the MBS data, the UE receives the next MBS data, Information can be obtained.

If there is no error in the uplink resource allocation information but there is an error only in the MBS data burst corresponding to the service content of the MBS data, the UE knows uplink resource allocation information for error feedback, (S505).

The UE can then determine whether the received quality criterion satisfied the received quality condition from the serving BS in step S501. In this case, if the UE operates the counter for calculating the error rate, it can be recorded in the counter that an error has occurred and then it can be determined whether the reception quality condition is satisfied (S506).

If only NACK feedback is considered, it is preferable that the reception quality condition be a condition that the UE transmits NACK feedback to the serving base station. For example, if the packet error rate (PER) of the MBS data received by the UE is 10 ^-2 or more, it is assumed that the reception quality condition is satisfied. That is, if an error occurs in the MBS data packet periodically transmitted to the UE at a frequency of one or more at 100 times, it satisfies the reception quality condition for NACK feedback.

If it is determined that the reception quality condition for NACK feedback is satisfied, the UE can transmit a feedback code for NACK to the serving BS (S507).

On the other hand, if the condition is not satisfied as a result of determining whether the reception quality condition is satisfied, the terminal can receive the next MBS data (S508).

In other words, if the reception quality condition for ACK feedback is satisfied, the UE can transmit one of the one or more feedback codes indicating ACK to the serving BS using the uplink resource allocation information acquired by the UE. In the same way, the UE can transmit one of the one or more feedback codes for NACK to the serving BS if the condition for NACK feedback is satisfied. Here, the criterion by which the terminal selects one of the one or more feedback codes indicating the same kind of feedback response may be random.

In this case, the serving base station can compare the feedback code received from the terminal with information of the code set and the reception quality condition assigned by the terminal, and can grasp the type and content of the feedback sent from the terminal. The serving base station can transmit the type and content of the detected feedback to the MBS network. The MBS network performs adaptive modulation and coding (AMC) on the type and content of the transmitted feedback, Can be performed. Here, AMC refers to adaptively adjusting a modulation and coding scheme level (MCS level) of predetermined data according to feedback information or the like.

The transmission of the NACK feedback code and the transmission of the ACK / NACK feedback code will be described with reference to FIGS. 6 and 7. FIG.

First, a case where only NACK feedback is considered will be described with reference to FIG.

Referring to FIG. 6, MBS data including uplink allocation information may be transmitted from a MBS network to a mobile station via a serving base station (S601).

Thereafter, an error may occur in receiving the MBS data transmitted to the terminal (S602).

At this time, if the UE satisfies the reception quality condition for the predetermined NACK feedback, the UE may randomly select one of the feedback codes, which is a set of one or more feedback codes for NACK feedback, and transmit it to the serving BS. The serving BS receiving the feedback code can inform the MBS network that the reception quality condition for NACK feedback is satisfied (S603).

Accordingly, the MBS network can collect feedback information from each base station, including feedback of the UE, and perform AMC according to the feedback information (S604).

That is, if it is determined that the NACK feedback for the current MCS level exceeds a predetermined criterion, the MBS network lowers the MCS level so that all terminals in the MBS zone, which the MBS network is responsible for, can successfully receive data. In contrast, if the NACK feedback is below a predetermined level, the MBS network can maintain the current MCS level and lower the MCS level below the required level, thereby preventing wasted radio resources.

Next, with reference to FIG. 7, a case in which ACK and NACK feedback are considered together will be described.

Referring to FIG. 7, MBS data including uplink allocation information from the MBS network may be transmitted to the UE through the serving BS (S701).

If the MBS data is successfully transmitted without any error in receiving the MBS data, the UE can determine that the reception quality condition for the ACK feedback is satisfied (S702).

Accordingly, the UE can randomly select one of the feedback codes indicating the ACK in the feedback code set and transmit it to the serving BS. Upon receiving the feedback code indicating ACK, the serving BS can inform the MBS network that the reception quality condition for ACK feedback is satisfied (S703).

As the subsequent MBS data transfer continues, an error may occur in receiving the MBS data (S704).

At this time, if the reception quality condition for NACK feedback is satisfied, the UE may randomly select one of the feedback codes indicating NACK in the feedback code set and transmit the selected feedback code to the serving base station. Upon receiving the feedback code indicating the NACK, the serving BS can inform the MBS network that the reception quality condition for NACK feedback is satisfied (S705).

Accordingly, the MBS network can collect feedback information from each base station, including feedback of the UE, and perform AMC to adjust the MCS level according to the feedback information (S706).

That is, when it is determined that the NACK feedback for the current MCS level exceeds a predetermined level, the MBS network lowers the MCS level so that all terminals in the MBS zone, which the MBS network is responsible for, can successfully receive the MBS data. Conversely, if ACK feedback exceeds a certain level, radio resources can be utilized more efficiently by increasing the current MCS level for MBS data.

Referring back to FIG. 5, the terminal that has transmitted feedback to the serving BS as described above may reset the error counter for the feedback response and continue to receive the next MBS data (S508).

Next, the manner in which the above-mentioned uplink resource allocation information is included in the MBS data will be described in detail with reference to FIG. 8 and FIG.

FIG. 8 shows a private MAP when a single carrier is used, and FIG. 9 shows the allocation of uplink resource allocation information using a private map when multiple carriers are used.

As shown in FIG. 8, an uplink (UL) to transmit a feedback code for a corresponding MBS data burst (Burst) 804 through a feedback channel pointer IE field 803 to a private MAP The location of the resource (UL Channel 805) may be indicated.

That is, when there is an error in the corresponding MBS data burst 804, the UE can transmit feedback to the serving BS through the uplink resource 805 indicated by the feedback channel pointer 803 of the private map 802 will be. At this time, the UE can acquire the position of the private map and the data burst by decoding a multicast control channel (MCCH) (hereinafter referred to as MCCH) 801.

In addition, when the UE reads the private map 802 that precedes the data burst 804, the UE can know the transmission period of the next data burst 806. In this case, since the MCCH 801 is not decoded from the next transmission .

Herein, the individual map may include resource allocation information and frame configuration information for a specific user. More specifically, information on uplink and downlink bandwidth allocation areas and system operation information to be demodulated by a specific terminal is included in the next frame (MAP) that can include control information to be transmitted to the base station. The feedback channel pointer information element indicates the location of the uplink resource (UL channel) allocated to the terminal by the serving base station so that the terminal can transmit the feedback code.

The UE may transmit a feedback code for all bursts from Burst 1 to nth through one uplink resource or may be divided and transmitted through several uplink resources.

In addition, a feedback channel pointer information element may be included in the MCCH to indicate an uplink resource (i.e., a UL channel) to transmit a feedback code for MBS data bursts. That is, the UE can decode the MCCH and check the location of the data burst and the feedback channel pointer information element. If an error occurs in the data burst identified by the position or the reception quality condition is satisfied, the UE can use the uplink resource (UL Channel) indicated by the feedback channel pointer.

In another method of transmitting the feedback channel pointer information element, the base station can transmit the feedback channel pointer information element to the BCH of the superframe to which the MCCH is transmitted and transmit the feedback channel pointer information element. In this case, the feedback channel pointer information element may be omitted in the MCCH.

In order to implement the above description, the feedback channel pointer information element in a single carrier environment may have a form as shown in Table 8 below.

Syntax Size
(bit) Notes Feedback Channel Pointer IE_format () { - - ~ Feedback Channel Frame number for MBS Data Burst Frame number of feedback transmission number of feedback channels The number assigned to the feedback channels Start resource unit number The first resource unit number used for the feedback channel ~ } // End of Feedback Channel Pointer IE

Next, a case of using a multi-carrier will be described with reference to FIG. The carrier wave that can be used for communication between the base station and the terminal can be variously determined according to its use, system specifications, or needs, but it is assumed that two carriers are used in FIG.

As shown in FIG. 9, when there is an MBS dedicated carrier and a primary carrier, MBS data bursts can be transmitted to the terminal through an MBS dedicated carrier wave. The transmission of the feedback code of the UE to the MBS data bursts may be performed through the uplink resource allocated to the main carrier. That is, the base station includes a feedback channel pointer information element in a private MAP of an MBS dedicated carrier, and indicates an uplink resource (UL channel) to which a feedback code for each MBS data burst of the terminal can be transmitted )can do.

Also, as mentioned in the case of the single carrier described above, the base station includes a feedback channel pointer information element in the MCCH of the MBS dedicated carrier even in a multi-carrier environment so that the feedback to the MBS data bursts is transmitted to the uplink resource channel.

In addition, a method of transmitting a feedback channel pointer information element in a BCH (not shown) of a superframe of an MBS dedicated carrier on which the MCCH is transmitted may also be used. In this case, a feedback channel pointer information element is omitted in the MCCH It is also as described above.

In order to implement the above description, the feedback channel pointer information element in the multi-carrier environment may have a form as shown in Table 9 below.

Syntax Size
(bit) Notes Feedback Channel Pointer IE_format () { - - ~ Carrier indication Indicates the carrier transmitting the feedback Feedback Channel Frame number for MBS Data Burst Frame number of feedback transmission number of feedback channels Number of assigned feedback channels Start resource unit number The first resource unit used for the feedback channel ~ } // End of Feedback Channel Pointer IE

Fifth Embodiment

The fifth embodiment of the present invention provides a method for receiving a feedback from a serving base station receiving MBS in an idle mode and reporting it to the MBS network for efficient MBS transmission. This will be described with reference to FIG.

10 is a flowchart illustrating a feedback transmission / reception method of a serving BS according to a fifth embodiment of the present invention.

Referring to FIG. 10, the serving BS can inform the UE of a reception quality condition when the UE enters the idle mode. At this time, the reception quality condition may be included in the DREG-CMD message and transmitted to the terminal (S1001).

Next, the serving base station may select a feedback code set and notify the terminal (S1002). Here, the feedback code set refers to a set of one or more CDMA codes selected by the serving base station among the CDMA codes that can be used for the initial ranging as described in the fourth embodiment.

The serving BS does not need to select the feedback code for ACK and the feedback code for NACK to be distinguished from each other when the UE feeds back only one of ACK and NACK. However, when the UE feeds back both ACK and NACK, the serving BS desirably selects one or more feedback codes indicating ACK and one or more feedback codes indicating NACK.

When the serving BS completes the selection of the feedback code set, it can transmit it to the terminal (S1003). At this time, the feedback code set can be allocated from the serving base station to the terminal through the BCH.

Then, the serving BS can transmit MBS data including uplink allocation information for receiving a feedback code from the MS to the MS (S1004). At this time, since the manner in which the uplink resource allocation information is included in the MBS data is the same as described in the fourth embodiment, the description will be omitted for simplicity.

Thereafter, as the MBS data transmission continues, an error may occur in receiving the MBS data of the terminal. Accordingly, the UE can transmit a feedback code to the serving BS according to the reception quality condition.

When the serving BS receives the feedback code from the UE, the serving BS can transmit feedback information corresponding to the received feedback code to the MBS network (S1005). This is to provide a basis for the MBS network to perform AMC.

That is, since the serving BS knows the feedback code set and the reception quality condition transmitted to the UE, when the feedback code indicating the negative response (NACK) is received as a result of receiving the feedback code from the UE, Can be transmitted to the MBS network. Conversely, the base station may transmit feedback information to the MBS network indicating that the feedback quality code satisfies a reception quality condition for feedback of an acknowledgment when a feedback code indicating an acknowledgment (ACK) is received.

Accordingly, the MBS network can collect feedback information from each base station, including feedback information transmitted from the serving base station. And perform AMC to adjust the MCS level to the result.

That is, when it is determined that the NACK feedback for the current MCS level exceeds a predetermined level, the MBS network lowers the MCS level so that all terminals in the MBS zone, which the MBS network is responsible for, can successfully receive the MBS data. In contrast, when the ACK feedback exceeds a predetermined level, the MBS network can utilize radio resources more efficiently by increasing the current MCS level for MBS data.

Sixth Embodiment

The sixth embodiment of the present invention provides a method for performing location update when a terminal receiving an MBS enters an idle mode and satisfies a specific condition for efficient MBS transmission.

11 shows an example of a location update process according to the sixth embodiment of the present invention.

Referring to FIG. 11, a UE may negotiate a location update parameter and a condition for MBS with a serving BS when entering an idle mode to acquire a condition for performing a location update. For this purpose, the UE sets the MBS location update support field of the DREG-REQ message to "1 " and transmits the MBS location update support message to the serving BS in step S1101.

Accordingly, the serving base station may transmit a DREG-CMD message including parameters necessary for location update for the MBS to the terminal (S1102).

At this time, the serving base station may transmit the DREG-CMD message including the parameters necessary for location update for the MBS to the MS without performing step S1101.

The contents that can be included in the message delivered through the negotiation process are shown in Tables 10 to 12 below.

First, Table 10 shows an example in which a location update support field for MBS is included in the deregistration request message related to the sixth implementation of the present invention.

Syntax Size
(bit) Notes MOB_DREG-REQ_Message_format () { - - ~ MBS location update support field 0: No location update support for MBS
1: Location update support for MBS ~ } // End of MOB_DREG-REq

Table 11 shows an example of a form in which MBS information (MBS Information) is included in the deregistration command message.

Syntax Size
(bit) Notes MOB_DREG-CMD_Message_format () { - - ~ MBS Information See Table 12 ~ } // End of MOB_DREG-CMD

Details that may be included in MBS information are described in more detail with reference to Table 12. Table 12 shows an example of contents that can be included in the MBS information field included in the deregistration command message in Table 11 in more detail.

Field Length Notes Reserved Location update Duration Location update cycle Location update duration for MBS The period for MBS location updates. Start offset which collects information for MBS An offset field indicating the time at which the reception quality measurement is to be started MBS data error threshold Threshold field of MBS reception quality condition

Referring to Table 12, the Location Update Duration field indicates a location update period periodically performed by the UE in the idle mode. The Location update duration for MBS field is a period for performing location update for MBS when the terminal expires. In the MBS information field, if the MS updates the MBS reception quality information in order to allow the MS to receive the MBS reception quality information only from a predetermined time before the current location update time, Which indicates the time at which to start the operation. The MBS data error threshold field indicates a threshold of a reception quality condition for performing location update for MBS. In addition, the UE may perform location update according to conditions such as paging group location update, power down location update, and MAC hash skip threshold update. .

For example, if the location update timer of one of the terminal (MS), the macro base station (MBS), and the femto base stations (FBS) expires, the terminal may perform time based location update. In addition, the terminal can perform paging group location update when its paging group is changed. In addition, the terminal may perform a power down update before turning off the power.

Next, the UE can determine whether the received location update condition is satisfied. If it is determined that the location update condition is satisfied, the UE can transmit a ranging request (RNG-REQ) message for location update to the serving BS have. At this time, the ranging request message may include specific information for the MBS network (S1103).

The MBS network can receive and respond to specific information. Description of the remaining location update process will be omitted.

At this time, the action of the MBS network corresponding to the specific information and specific information for the MBS network may vary depending on the location update condition. Therefore, the location update procedure according to the present embodiment will be described in more detail below by dividing each location update condition.

First, the case where the location update condition is satisfied with the MBS data reception quality condition or the predetermined location update cycle is elapsed will be described.

In this case, the specific information for the MBS network may include at least one of mobility information of the UE, a Modulation and Coding Scheme (MCS) level preferred by the UE, and MBS data reception quality information.

In addition, the mobility information of the terminal may include at least one of a speed, a moving direction, and a current coordinate value of the terminal. The MBS data reception quality information may include at least one of an average received signal-to-noise ratio (SNR) and a received signal strength indicator (RSSI) for a predetermined specific time.

A ranging request (RNG-REQ) message for the UE to transmit the specific information to the serving BS may include the contents shown in Tables 13 and 14 below.

First, Table 13 shows an example of a form including MBS information (MBS Information) included in the ranging request message.

Syntax Size
(bit) Notes MOB_RNG-REQ_Message_format () { - - ~ MBS Information See Table 14 ~ } // End of MOB_RNG-REQ

The contents that can be included in MBS information in Table 13 will be described with reference to Table 14.

Table 14 shows an example of the contents that can be included in the MBS information (MBS Information) field of Table 13.

Field Length Notes Reserved Preferred MCS level The terminal's preferred MCS level MS Speed Bit 0: Current speed of the terminal
Bit 1: Average speed of the terminal MS coordinates Location of terminal MS Moving Direction Direction of movement of the terminal SNR Average SNR value at a specific time interval RSSI Average Received Signal Strength Indicator (RSSI) value over a specific time period

Referring to Table 14, the MBS information may include a MCS level preferred by the UE, mobility information of the UE, and reception quality information.

When the specific information is included in the ranging request message for location update and transmitted to the serving BS, the serving BS can transmit the specific information to the MBS network.

Then, the MBS network can grasp the area in which the terminal moves forward based on the mobility information of the terminal. The MBS network can perform AMC for determining an optimal MCS level for each of the MSs located in an MBS zone of the MBS network in order to efficiently use radio resources based on the MBS data reception quality information . In addition, the MBS network may perform AMC in which a moving region of a mobile station is considered by combining mobile terminal identification and AMC. That is, the MBS network can recognize the expected area where the mobile terminal moves using the mobility information of the mobile station, and can transmit the MBS data to the MCS level adjusted to the area. This will be described with reference to FIG.

12 is a conceptual diagram illustrating the performance of an AMC in consideration of mobility of a terminal according to a sixth embodiment of the present invention.

Referring to FIG. 12, it is assumed that the terminal 1201 receiving the MBS in the idle mode moves from the current location 1210 to the movement expected area 1220. If the MCS level of the UE in the current location 1210 is lower than the MCS level of the cell in the expected area 1220, the MBS network 1230 transmits the MCS level of the UE 1201 to the MCS level, The MBS data may be transmitted to the BS 1220. Thus, even if the terminal 1201 enters the new area 1220, the terminal 1201 can continue to reliably receive the MBS data.

Meanwhile, the serving BS determines whether the location update condition is the latest schedule before the predetermined location update period has expired, using the offset field (Start offset of collecting information for MBS) It is possible to measure the MBS data reception quality during the time. This will be described with reference to FIG.

13 shows a reception quality measurement period of MBS data using an offset of a terminal according to the sixth embodiment of the present invention.

Referring to FIG. 13, when there is a predetermined location update period 1301, the UE may not measure the reception quality of the MBS data during the offset 1302 indicated by the offset field (Start offset which collects information for MBS) have.

Once the offset 1302 has elapsed, the terminal can measure the reception quality of the MBS data for the remaining time excluding the offset 1302 in the location update period 1301, that is, the latest predetermined time 1303 before the location update period expires have.

When the update period 1301 expires, the UE may transmit the MBS data reception quality measured during a predetermined period of time 1303 to the serving BS when the location update is performed 1304.

Finally, the case where the location update condition is the MBS reception stop of the terminal will be described.

When the MBS reception stop is set as a condition for performing the location update, the MS can notify the MBS network that the MBS reception is stopped while performing the location update while stopping the reception of the MBS. In this way, the MBS network can prevent the MBS data from being transmitted by the serving base station that is in charge of the terminal, thereby preventing waste of radio resources, and the MBS network does not have to consider the terminal to perform the AMC.

To this end, the ranging request (RNG-REQ) message transmitted from the UE to the serving BS may include the contents shown in Table 15 below.

Field Length Notes  MBS Service de-subscription Indicator  Indicates that the UE performs location update because it stops receiving the current MBS  MBS connection Indicator  Indicator (s) indicating the MBS service for which reception is to be terminated

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative.

The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention. In addition, claims that do not have an explicit citation in the claims may be combined to form an embodiment or be included in a new claim by amendment after the filing.

FIG. 1 shows a process in which a UE enters an idle mode in a conventional IEEE 802.16e system.

FIG. 2 illustrates a process in which MBS connection and entry into an idle mode according to a first embodiment of the present invention are performed together in a single procedure.

FIG. 3 illustrates a process in which MBS connection and entry into an idle mode according to a second embodiment of the present invention are performed together in a single procedure.

FIG. 4 illustrates a process in which MBS connection and entry into an idle mode are performed together in one procedure according to a third embodiment of the present invention.

5 is a flowchart illustrating a feedback transmission procedure of a UE according to a fourth embodiment of the present invention.

FIG. 6 illustrates a process of transmitting a NACK feedback code of a UE according to the fourth embodiment of the present invention.

FIG. 7 shows a process of transmitting an ACK feedback code and a NACK feedback code of a UE according to a fourth embodiment of the present invention.

FIG. 8 shows allocation of uplink allocation information using a private MAP when a single carrier of a UE according to the fourth embodiment of the present invention is used.

FIG. 9 shows the allocation of uplink resource allocation information using a private map in the case of using multiple carriers of a UE according to the fourth embodiment of the present invention.

10 is a flowchart illustrating a feedback transmission / reception method of a serving BS according to a fifth embodiment of the present invention.

11 shows an example of a process of acquiring a condition for performing location update according to the sixth embodiment of the present invention.

12 is a conceptual diagram illustrating the performance of an AMC in consideration of mobility of a terminal according to a sixth embodiment of the present invention.

FIG. 13 shows a reception quality measurement period of MBS data using an offset of a terminal according to the sixth embodiment of the present invention.

Claims (22)

A method of supporting a Multicast Broadcast Service (MBS) transmission in an idle mode, Receiving MBS data including uplink allocation information for feedback transmission from a serving base station; And And transmitting a predetermined feedback code selected from initial ranging codes to the serving BS using uplink resources indicated by the uplink allocation information according to the reception quality of the MBS data. MBS transmission support method. The method according to claim 1, Further comprising receiving a feedback code set from the serving base station, The predetermined feedback code includes: One of which is selected in the feedback code set, The feedback code set includes: Wherein at least one of the initial ranging codes is selected by the serving BS. 3. The method of claim 2, The feedback code set includes: A set of one or more feedback codes for negative acknowledgment (NACK) feedback, Wherein the step of transmitting the predetermined feedback code comprises: And the reception quality is satisfied when the reception quality satisfies a reception quality condition for feeding back a predetermined negative acknowledgment (NACK). 3. The method of claim 2, The feedback code set includes: A feedback code for positive acknowledgment (ACK) feedback and a negative feedback (NACK) feedback selected by the serving base station, Wherein the step of transmitting the predetermined feedback code comprises: One of the feedback codes is transmitted in the feedback code set according to whether the reception quality satisfies a reception quality condition for feeding back a predetermined acknowledgment (ACK) and a reception quality condition for feeding back a negative response (NACK) The MBS transmission method comprising: The method according to claim 1, The uplink allocation information for the feedback transmission includes: Wherein the feedback information is obtained through a feedback channel pointer IE. 6. The method of claim 5, Wherein the feedback channel pointer information element comprises: A private MAP, a multicast control channel (MCCH), and a broadcast control channel (BCH). The method according to claim 6, In a multi-carrier environment, The feedback channel pointer IE is transmitted via a first carrier, And indicates an uplink resource allocated for the feedback transmission in the second carrier. 8. The method of claim 7, Wherein the first carrier comprises: MBS dedicated carrier, The second carrier wave, Wherein the MBS is a primary carrier. A method for receiving a feedback on a multicast broadcast service (MBS) from a terminal in an idle mode, Transmitting a feedback code set for feedback and a preset reception quality condition to the terminal; Transmitting MBS data including uplink allocation information for receiving a feedback code from the MS to the MS; And And receiving the feedback code from the MS through an uplink resource indicated by the uplink allocation information. 10. The method of claim 9, The feedback code set includes: Wherein the MBS is transmitted to the MS through a broadcast control channel (BCH). 10. The method of claim 9, The feedback code set includes: A set of one or more feedback codes for feeding back a negative acknowledgment (NACK) The predetermined reception quality condition may be, Wherein the terminal is a reception quality condition for feeding back a negative response. 12. The method of claim 11, Wherein the step of transmitting feedback information corresponding to the received feedback code to the MBS network comprises: If feedback information of one or more codes for feedback of the negative acknowledgment (NACK) is received from the terminal, feedback information indicating that the feedback condition satisfies a reception quality condition for feedback of the negative acknowledgment is transmitted to the MBS network The MBS transmission method. delete delete delete delete delete delete delete delete delete delete

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