KR101706945B1 - Method of managing carriers in a Broadband Wireless Access System - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a method and apparatus for managing a carrier allocated to a terminal in a multi-carrier broadband wireless access system. In a method for performing carrier management in a broadband wireless access system supporting a multi-carrier according to an embodiment of the present invention, the method includes the steps of: receiving, from a base station, an activation request for activation of at least one second carrier allocated through a first carrier; Transmitting request information to the base station; Receiving a first message from the base station, the first message including activation indication information indicating activation of at least one target carrier of the at least one second carrier; And transmitting a second message to the base station to notify the base station whether the at least one target carrier is ready according to the activation. Here, the activation request information may be determined according to the power state of the terminal.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for managing a carrier in a broadband wireless access system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a method and apparatus for managing a carrier allocated to a terminal in a multi-carrier broadband wireless access system.

Hereinafter, the carrier will be briefly described.

The user may include information to be transmitted by modulating the amplitude, frequency, and / or phase of the sinusoidal wave or periodic pulse wave. At this time, a sine wave or a pulsed wave that carries information is called a carrier.

Carrier modulation schemes include a single-carrier modulation scheme (SCM) or a multi-carrier modulation scheme (MCM) modulation scheme. Of these, the single carrier modulation scheme is a modulation scheme in which all information is carried on one carrier and modulated.

In the multicarrier modulation scheme, a full-bandwidth channel of one carrier is divided into sub-channels having a plurality of small bandwidths, and a plurality of narrow-band sub-carriers are transmitted through each sub-channel It is a technology that transmits in multiple.

At this time, when using the multicarrier modulation scheme (MCM), each subchannel can be approximated to a flat channel due to a small bandwidth. In addition, the user can compensate for channel distortion using a simple equalizer. In addition, the multi-carrier modulation scheme can be implemented at a high speed using Fast Fourier Transform (FFT). That is, it is advantageous for high-speed data transmission as compared with the single-carrier modulation method (SCM).

As the performance of the base station and / or the terminal evolves, the frequency bandwidth that can be provided or used by the base station and / or the terminal is widening. Accordingly, embodiments of the present invention disclose a multi-carrier system that supports wideband by using one or more carriers in a carrier aggregation.

That is, the multi-carrier system described below shows a case in which one or more carriers are used by being bundled, unlike the multi-carrier modulation method using one carrier as described above.

A plurality of carriers (for example, a plurality of frequency carriers (FC)) are used for one medium access control (MAC) control to efficiently use multi-band (or multi-carrier) ) Techniques managed by entities have been proposed.

1 (a) and 1 (b) are diagrams for explaining a method of transmitting and receiving a multi-band radio frequency (RF) signal.

In FIG. 1, one medium access control layer in a transmitter and a receiver can manage a plurality of carriers in order to efficiently use multicarrier. At this time, in order to effectively transmit and receive the multicarrier, it is assumed that both the transmitting end and the receiving end can transmit and receive multicarrier. At this time, frequency carriers (FCs) managed in one medium access control layer are flexible in terms of resource management because they do not need to be adjacent to each other. That is, contiguous aggregation or non-contiguous aggregation is possible.

1 (a) and 1 (b), the physical layer PHY 0, the physical layer 1, the physical layer n-2, and the physical layer n-1 represent multi-bands according to the present invention, And may have a frequency carrier (FC) size that allocates for a particular service according to a predetermined frequency policy. For example, RF carrier 0 may have a size of a frequency band allocated for general FM radio broadcasting, and RF carrier 1 may have a size of a frequency band allocated for mobile communication Lt; / RTI >

As described above, each frequency band may have different frequency band sizes depending on the respective frequency band characteristics, but in the following description, it is assumed that each frequency carrier FC has a size of A [MHz] for convenience of explanation. Further, each frequency allocation band may be represented by a carrier frequency for use of the baseband signal in each frequency band. Hereinafter, each frequency allocation band is referred to as a "carrier frequency band" The representative is simply referred to as "carrier ". Also, as in recent 3GPP LTE-A, the above-described carriers can be referred to as "component carriers" in order to distinguish them from subcarriers used in the multicarrier scheme .

In this regard, the "multi-band" scheme described above may be referred to as a " Multi Carrier "scheme or a" carrier aggregation "scheme.

2 shows an example of a mode in which a multi-carrier is used in a general wireless communication system.

Referring to FIG. 2 (a), the multicarrier in the conventional technique may be a contiguous carrier aggregation, and may be a non-contiguous carrier aggregation ). The unit for combining these carriers is a basic bandwidth unit of a legacy system (e.g., LTE for an LTE (Long Term Evolution) -advanced system and IEEE 802.16e for an IEEE 802.16m system). In the general multicarrier environment, the following two types of carriers are defined.

First, a first carrier (or a primary carrier) refers to a carrier on which exchange of traffic between a UE and a base station, a full physical layer, and full PHY / MAC control information is performed. Also, the main carrier may be used for general operation of the terminal, such as network entry. Each terminal has one main carrier in one cell.

The second carrier (or secondary carrier) is an additional carrier that can be used for exchanging traffic according to a base station-specific allocation command and a rule normally received from the first carrier. The second carrier may comprise control signaling to support multi-carrier operation.

A general technique is to divide a carrier of a multi-carrier system into a fully configured carrier and a partially configured carrier based on the above-described primary and secondary carriers as follows.

First, a fully configured carrier is a carrier on which all control signaling is set up, including synchronization, broadcast, multicast and unicast control channels. In addition, information and parameters for multi-carrier operation and other carriers may be included in the control channels.

A partially configured carrier is a carrier for which all control channels for supporting downlink transmission in downlink carriers without paired uplink carriers in TDD DL transmission or frequency division duplex (FDD) mode are set It says.

In general, an MS performs an initial network entry through a primary carrier, and information on mutual multicarrier capabilities in a registration process through exchange of registration request / response (AAI_REG-REQ / RSP) Can be exchanged.

Accordingly, the terminal obtains information about the available carrier (s) of the base station, and the base station can assign at least one of the available secondary carrier (s) to the terminal. The UE must undergo an activation process for the corresponding carrier before performing the data exchange through the assigned carrier. Accordingly, the present invention proposes a more efficient secondary carrier activation method and an apparatus for performing the same.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of efficiently activating a carrier between a terminal and a base station in a multi-carrier environment.

It is another object of the present invention to provide an efficient method of informing a base station of a carrier capable of being activated in consideration of its state.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a method of performing carrier management in a multi-carrier broadband wireless access system, the method comprising: receiving, from a base station, Transmitting activation request information requesting activation to a carrier to the base station; Receiving a first message from the base station, the first message including activation indication information indicating activation of at least one target carrier of the at least one second carrier; And transmitting a second message to the base station to notify the base station whether the at least one target carrier is ready according to the activation. Here, the activation request information may be determined according to the power state of the terminal.

According to another aspect of the present invention, there is provided a method of managing a carrier of a mobile station in a multi-carrier broadband wireless access system, including the steps of: Receiving activation request information from the terminal requesting activation of a second carrier of the second carrier; Determining at least one target carrier to be activated among the at least one second carrier using the activation request information; And transmitting a first message including activation indication information indicating activation of the at least one target carrier to the terminal. Here, the activation request information may be determined according to the power state of the terminal.

According to another aspect of the present invention, there is provided a mobile terminal supporting a multi-carrier operation in a broadband wireless access system, the mobile terminal comprising: a processor; And a wireless communication (RF) module for transmitting / receiving wireless signals to / from the outside under the control of the processor. Wherein the processor is configured to generate activation request information requesting activation for at least one second carrier allocated through a first carrier from the base station according to its power state and to transmit the activation request information to the base station, 2 through the first message received from the base station, the activation indication information indicating activation of at least one of the two carriers.

In the above-described embodiments, the activation request information may include at least one of the maximum number and the minimum number of requests of the mobile station among the at least one second carrier.

Also, the terminal may operate in one of a plurality of different power modes according to the power state, and the activation request information may indicate the type of the power mode.

In addition, the activation request information may include at least one of whether the terminal is powered on and the battery level information.

Also, the activation request information is transmitted to the base station through a predetermined one of a MAC management message, an extension header, and a signaling header, and the first message is a carrier management command (AAI CMM-CMD) message , The second message is a carrier management indication (AAI_CM-IND) message, and the second carrier is allocated to the terminal through a multi-carrier response (AAI_MC-RSP) message.

In addition, it is preferable that the first carrier is a primary carrier and the second carrier is an assigned secondary carrier allocated to the terminal from the base station.

According to the embodiments of the present invention, the following effects are obtained.

First, by using embodiments of the present invention, an efficient carrier activation procedure can be defined.

Second, the BS can efficiently determine whether to activate the secondary carrier in consideration of the state of the UE through the embodiments of the present invention.

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

1 (a) and 1 (b) are diagrams for explaining a method of transmitting and receiving a multi-band radio frequency (RF) signal.
2 shows an example of a mode in which a multi-carrier is used in a general wireless communication system.
3 is a diagram for explaining an example of a procedure in which a base station allocates one or more carriers to a terminal in the BWA system according to the present invention.
4 shows an example of a secondary carrier activation procedure according to an embodiment of the present invention.
5 shows an example of a procedure in which a mobile terminal requests a base station to activate a carrier according to an embodiment of the present invention.
6 shows an example of a procedure for a mobile station to request a base station to activate a carrier according to an embodiment of the present invention.
7 is a block diagram showing an example of a structure of a transmitting end and a receiving end, according to another embodiment of the present invention.

The present invention relates to a wireless access system. Embodiments of the present invention will now be described with respect to efficient multi-carrier management methods.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or characteristic may 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. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. 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.

In the description of the drawings, there is no description of procedures or steps that may obscure the gist of the present invention, nor is any description of steps or steps that can be understood by those skilled in the art.

Herein, the embodiments of the present invention have been described with reference to the data transmission / reception relationship between the base station and the terminal. Herein, the base station is a terminal node of a network that directly communicates with the terminal. 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, various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station can be performed by a base station or other network nodes other than the base station. At this time, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, or an ABS (Advanced Base Station). The 'Mobile Station (MS)' may be replaced with terms such as User Equipment (UE), Subscriber Station (SS), Mobile Subscriber Station (MSS), Advanced Mobile Station (AMS) .

Also, the transmitting end refers to a node that transmits data or voice service, and the receiving end refers to a node that receives data or voice service. Therefore, in the uplink, the terminal may be the transmitting end and the base station may be the receiving end. Similarly, in the downlink, the terminal may be the receiving end and the base station may be the transmitting end.

Meanwhile, the mobile terminal of the present invention may be a PDA (Personal Digital Assistant), a cellular phone, a PCS (Personal Communication Service) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) Etc. may be used.

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.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the IEEE 802 systems, 3GPP systems, 3GPP LTE systems and 3GPP2 systems, which are wireless access systems. That is, the steps or portions of the embodiments of the present invention that are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document. In particular, embodiments of the present invention may be supported by one or more of the documents P802.16-2004, P802.16e-2005, P802.16Rev2, and P802.16m, which are standard documents of the IEEE 802.16 system.

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.

This specification assumes an IEEE 802.16 system. In particular, the following terminal is an AMS (Advanced Mobile Station) satisfying a standard defined by the IEEE 802.16m standard, and the base station is assumed to be an Advanced Base Station (ABS) of the same standard standard.

First, we define terms that can be used in multi-carrier operation.

1. Available carrier means all carriers belonging to the base station (ABS). The UE can acquire information on the available carriers through a AAI_Global-config message or a AAI_MC-ADV message.

2. Assigned carrier is a subset of available carriers that the base station assigns to the terminal according to the capability of the terminal. That is, the BS may assign one or more of its available carriers to the assigned secondary carrier of the MS in consideration of the capability of the MS.

3. Active carrier means a carrier that is actually ready to exchange data between the terminal and the base station, and may be a subset of the allocated carriers. Activation / deactivation of the assigned secondary carrier may be determined by the base station's judgment based on the quality of service (QoS) requirement. The base station can indicate to the terminal whether to activate / deactivate a specific secondary carrier through a carrier management command (AAI_CM-CMD) message.

Based on the above definition, a procedure for allocating a carrier to a terminal by a base station will be described with reference to FIG.

3 is a diagram for explaining an example of a procedure in which a base station allocates one or more carriers to a terminal in the BWA system according to the present invention.

Referring to FIG. 3, an AMS performs an initial network entry including scanning and ranging with a base station (ABS) (S301).

The UE and the BS can exchange information on mutual multicarrier capabilities through a Registration Request / Reply (AAI_REG-REQ / RSP) message (S302, S303).

The base station may transmit an AAI_Global-config message after transmitting the AAI_REG-RSP message to the terminal (S304).

The global carrier setup message includes information about all available carriers supported by the network.

In step S305, the UE receives the multicast announcement (AAI_MC-ADV) message broadcast periodically from the base station and obtains information on the multicarrier setting of the base station.

The UE then uses the acquired information to transmit information on carriers (AMS's supportable carriers) that it can support according to multicarrier configurations of the available carriers of the base station through a multi-carrier request (AAI_MC-REQ) message A list of allocated carriers can be requested to the base station by way of notifying the base station (S306).

The base station determines a subset to be allocated as a secondary carrier of the terminal in its available carrier based on the information received from the terminal, determines an allocated carrier list, and notifies the terminal of the subset through the multi-carrier response (AAI_MC-RSP) message S307).

In step S308, the base station may instruct the terminal to activate / deactivate the allocated carriers allocated to the terminal according to the determination based on the QoS request, through the carrier management command (AAI_CM-CMD) message.

The format of the carrier management command message may be as shown in Table 1 below.

Referring to Table 1, an AAI_CM-CMD message according to an exemplary embodiment of the present invention may include an action code, an indication type, an activation limit, a number of target carriers, a target carrier index, a ranging indicator, an uplink indicator field, . Table 1 illustrates the parameters related to the activation / deactivation of the secondary carrier. If the message is used for primary carrier change, the other parameters (for example, the physical index of the primary carrier to be changed, An operation time indicating on a super frame basis, and a field indicating the next state of the previous primary carrier, etc.).

Hereinafter, a method of newly activating an allocated secondary carrier of a terminal according to an embodiment of the present invention based on the above-described multicarrier allocation process will be described with reference to FIG.

4 shows an example of a secondary carrier activation procedure according to an embodiment of the present invention.

4, the base station uses three carriers C_0 to C_2 as available carriers, of which the C_0 carrier is set as the primary carrier of the terminal and the remaining carriers are set as the allocated secondary carriers (i.e., AAI_MC-REQ / RSP Message exchange has been completed).

First, the mobile station can exchange data with the base station via the primary carrier C_0 (S401).

The base station may transmit a scan response (AAI_SCN-RSP) message as needed to instruct the terminal to scan the allocated secondary carriers (S402).

Accordingly, the MS scans for C_1 and C_2 carriers (S403 and S404), and reports the result to the BS (S405).

Thereafter, the base station and the UE may exchange AAI CMM-CMD messages to instruct the UE to activate the C_1 carrier in order to satisfy QoS or for other reasons while exchanging traffic (S406).

The UE can perform the superframe header update (S408) or the periodic ranging (S409) of the target carrier (C_1) according to the parameter setting value of the AAI_CM-CMD message or as needed.

If the activation of the corresponding carrier is completed before the activation limit point is reached, the mobile station transmits an AAI_CM-IND message to the base station to notify the base station thereof (S410).

Accordingly, the BS allocates the CQICH to the MS (S411), and the MS can report the CQI to the BS (S412).

Thereafter, the terminal and the base station can exchange data through the primary carrier C_0 and the newly activated secondary carrier C_1, respectively (S413 and S414).

As shown in the secondary carrier activation procedure described above with reference to FIG. 4, in the current IEEE 802.16m standard, the activation / deactivation of the secondary carrier is defined to be triggered according to the base station's judgment. That is, other allocated secondary carriers other than the primary carrier of the UE may be activated / deactivated only by the AAI_CM-CMD message determined by the base station.

This is because monitoring the control channels of all secondary carriers that can support according to the capability of the terminal causes unnecessary power consumption, Only the carrier is monitored.

However, performing the activation / deactivation of the secondary carrier through the MAC management message in order to monitor only the minimum control channel despite the sufficient power of the terminal causes unnecessary message transmission / reception And may cause delays in the service.

First Embodiment

In an embodiment of the present invention, it is proposed that a terminal supporting a multicarrier can directly request a base station to activate a carrier.

To this end, a terminal supporting a multicarrier can notify the base station through a predetermined medium access control message of the number of secondary carriers that can be supported when considering its battery mode (power mode) or power mode .

Here, it is assumed that the battery mode of the terminal according to the present embodiment is divided into three modes: 1) always on mode, 2) power saving mode, and 3) maximum power saving mode. It is also assumed that the terminal monitors the control channels of all activated carriers.

5 shows an example of a procedure in which a mobile terminal requests a base station to activate a carrier according to an embodiment of the present invention.

In FIG. 5, it is assumed that the process after step S307 of FIG. 3 has been performed after the UE acquires the allocated carrier information from the base station.

First, a terminal requests a base station to activate an allocated secondary carrier of an appropriate number (all or some of the allocated carriers) in consideration of its power mode (hereinafter referred to as a "carrier management request (AAI_CM-REQ)" message for convenience) (S501).

More specifically, if the power mode of the terminal is the " always on mode ", it means that the power of the terminal is sufficient. Therefore, rather than activating only some carriers necessary for power saving, The mobile station may send a message requesting the base station to activate the requested number of allocated carriers. In the case of a power mode other than the "always on mode ", the UE can request the base station through the same request message to activate only the number of carriers suitable for its power mode.

Upon receiving the request message from the UE, the BS may transmit an AAI_CM-CMD message to the UE to activate the number of carriers requested by the UE among the allocated carriers of the UE (S502).

Accordingly, the mobile station can activate the secondary carrier indicated by the AAI_CM-CMD message and transmit the AAI_CM-IND message to report the carrier activation state to the base station at a point indicated by the activation limit field in the AAI_CM-CMD message (S503) .

In this case, the parameters of the carrier management request message transmitted from the UE to the BS in step S501 may include the following values.

- Type (Type or Action code): It is a field indicating the type of the requested carrier management procedure and is preferably set to a value indicating the activation of the secondary carrier.

- Minimum number of active carriers (s) (N min)): This parameter means the minimum value of the secondary carrier (that is, the carrier to be activated) from which the base station can indicate activation among the allocated carriers of the terminal . In other words, it means that the terminal requests the base station to always activate the secondary carrier by the value Nmin of this parameter. The UE may change the value of this parameter by retransmitting the AAI_CM-REQ message.

This parameter specifies the number of the secondary carrier (that is, the carrier to be activated) that the base station can instruct activation according to the power mode status of the allocated carriers of the terminal, . In other words, when considering the power mode of the UE, it means that the secondary carrier exceeding the value (Nmax) of this parameter is not supported. The UE may change the value of this parameter by retransmitting the AAI_CM-REQ message.

Hereinafter, a concrete form in which the above-mentioned parameters are included in the AAI_CM-REQ message will be described with reference to Tables 2 to 4.

Table 2 shows an example of a form in which the minimum number of active carriers field is included in the AAI_CM-REQ message according to an embodiment of the present invention.

Syntax Size (bit) Notes Carrier Management Request message { Management Message type = xxx 8 Carrier Management Request Message Carrier Management Request type 2 0b00: secondary carrier management 0b01: primary carrier change 0b10: carrier switching 0b11: reserved If (message type == 00) {     Minimum Number of carriers TBD Represents the minimum number of carriers that the UE can monitor the control channel. } If (message type == 01) {          ... TBD Required parameters can be defined when the primary carrier change is triggered (requested) by the terminal } If (message type == 10) {          ... TBD Required parameters can be defined when carrier switching is triggered (requested) by the terminal } }

Referring to Table 2, the Minimum Number of Carriers (Nmin) field may have a value between 1 and the number of allocated carriers (M) of the UE. If the corresponding field is set to 1, it indicates that the terminal requests the base station to always activate only the primary carrier. If the corresponding field is set to M, it indicates that the terminal requests the base station to always activate all allocated carriers.

In the base station that has received the AAI_CM-REQ message having the configuration as shown in Table 2, the number of carriers of the value Nmin of the least active carrier field is always activated. If necessary, the number of (Nmin + 1) (M) can instruct the terminal whether to activate the AAI_CM-CMD message according to its own decision.

Table 3 shows an example of a mode in which the maximum number of active carriers field is included in the AAI_CM-REQ message according to an embodiment of the present invention.

Syntax Size (bit) Notes Carrier Management Request message { Management Message type = xxx 8 Carrier Management Request Message Carrier Management Request type 2 0b00: secondary carrier management 0b01: primary carrier change 0b10: carrier switching 0b11: reserved If (message type == 00) {     Maximum Number of carriers TBD Represents the maximum number of carriers that the UE can monitor the control channel. } If (message type == 01) {          ... TBD Required parameters can be defined when the primary carrier change is triggered (requested) by the terminal } If (message type == 10) {          ... TBD Required parameters can be defined when carrier switching is triggered (requested) by the terminal } }

Referring to Table 3, the Maximum Number of Carriers (Nmax) field may have a value between 1 and the number of allocated carriers (M) of the UE. When the corresponding field is set to 1, only the primary carrier is always activated, indicating that the terminal requests the base station that there is no secondary carrier that can be further activated. If the corresponding field is set to M, it indicates to the base station that all assigned carriers can be activated / deactivated according to the QoS.

The base station that has received the AAI_CM-REQ message having the configuration as shown in Table 3 can allocate only the number of carriers equal to the value (Nmax) of the maximum number of active carriers field to the active carrier of the UE. That is, the base station can indicate to the terminal whether to activate / deactivate the terminal for carriers ranging from one to the number of allocated carriers (M) through the AAI_CM-CMD message.

Table 4 shows an example of a form in which the maximum number of active carriers field and the minimum number of active carriers field are included in the AAI_CM-REQ message according to an embodiment of the present invention.

Syntax Size (bit) Notes Carrier Management Request message { Management Message type = xxx 8 Carrier Management Request Message Carrier Management Request type 2 0b00: secondary carrier management 0b01: primary carrier change 0b10: carrier switching 0b11: reserved If (message type == 00) {     Maximum Number of carriers TBD Represents the maximum number of carriers that the UE can monitor the control channel.     Minimum Number of carriers TBD Represents the minimum number of carriers that the UE can monitor the control channel. } If (message type == 01) {          ... TBD Required parameters can be defined when the primary carrier change is triggered (requested) by the terminal } If (message type == 10) {          ... TBD Required parameters can be defined when carrier switching is triggered (requested) by the terminal } }

Referring to Table 4, the AAI_CM-REQ message together with the minimum number of active carriers field described above with reference to Table 2 and the maximum number of active carriers field described above with reference to Table 3 can be included. The description of each field is similar to that described in Table 2 and Table 3, so that redundant description will be omitted for simplicity of description.

When the base station receives the AAI_CM-REQ message having the configuration as shown in Table 4, the BS always activates the allocated carriers corresponding to the minimum number of active carriers field value, but does not exceed the maximum number of active carriers field, It is possible to determine whether or not to activate the remaining secondary carriers.

Second Embodiment

According to another embodiment of the present invention, there is provided a method for requesting activation of a carrier from a base station in such a manner that the terminal informs the base station of its power mode or the battery level itself.

That is, a terminal supporting a multicarrier can report its power mode to the base station periodically or whenever a mode is changed. The base station may determine whether to activate the allocated carrier according to the power mode of the reported terminal. This may be used in conjunction with a message or an extension header (EH) to report a general battery level to the base station.

Here, it is assumed that the battery mode of the terminal according to the present embodiment is divided into three modes: 1) always on mode, 2) power saving mode, and 3) maximum power saving mode. It is also assumed that the terminal monitors the control channels of all activated carriers.

6 shows an example of a procedure for a mobile station to request a base station to activate a carrier according to an embodiment of the present invention.

In FIG. 6, it is assumed that the process after step S307 in FIG. 3 is completed after the UE acquires the allocated carrier information from the BS.

First, the terminal transmits information on its power mode to the base station (S601).

The power mode information may include various types of information such as an extended header (EH), a signaling header, a MAC management message or a feedback channel Lt; / RTI > to the base station.

In step S602, the BS receiving the power mode information of the UE may instruct the UE to activate the carrier by informing the UE of the power mode to be activated through the AAI_CM-CMD message.

For example, when the reported power mode of the terminal is the "always-on mode ", the base station may not be able to activate all the allocated carriers that the terminal can support, To further reduce the signaling overhead that may occur. That is, the base station can indicate through the AAI_CM-CMD message that all or some of the allocated carriers that can be supported by the corresponding terminal can be activated for the terminal reporting that the power mode is "always on mode". In addition, the base station may reallocate the feedback channel so that the terminal may perform feedback (e.g., CQI) reporting more frequently. In addition, the base station may indicate via the AAI_CM-CMD message that the terminal no longer needs to report the battery level or power mode, or may no longer expect battery level reporting from the terminal.

As another example, when the reported power mode of the terminal is the " power save mode " or the " maximum power save mode ", the active carrier of the terminal can be determined considering the power mode in order to more efficiently support the power saving of the terminal.

Accordingly, the UE can transmit the AAI_CM-IND message to activate the secondary carrier indicated by the AAI_CM-CMD message and report the carrier activation state to the base station at the time point indicated by the activation limit field in the AAI_CM-CMD message (S603) .

An example of a signaling header type for reporting the battery level to the base station will be described with reference to Table 5. < tb > < TABLE >

Referring to Table 5, a signaling header for reporting a battery level of the terminal to a base station is a value indicating a signaling header for battery level reporting, a flow identifier field set to a value indicating a signaling header (i.e., 0001) Set type field. A length field indicating the length of the signaling header, a battery status (AMS battery status) field indicating whether the power cord is connected, a battery level indication field indicating whether detailed information on the battery level is included, and the like . If the battery level indication field is set to 1, the AMS Battery Level field indicating the battery level of the terminal in units of a predetermined percentage may be further included in the present signaling header.

In Table 5, although the terminal illustrated the signaling header in the form of reporting the battery level to the base station, fields similar to or similar to the above-described fields may be included in the MAC management message or the extended header.

Third Embodiment

In yet another embodiment of the present invention, a method is provided for requesting activation of a carrier from a base station by a method for a terminal to inform its base station of its preferred carrier management mode.

That is, a terminal supporting a multicarrier can report its preferred carrier management mode among the predetermined one or more carrier management modes periodically or whenever the mode is changed. This is typically used with a report message or signaling header informing the base station of the battery level, or may be reported to the base station via the AAI_CM-REQ message described above.

The following is an example of a carrier management mode configuration proposed in this embodiment.

- Static Mode: All assigned carriers are always active.

- Dynamic mode: At least some of the allocated carriers can be activated / deactivated depending on the load status of the service or base station.

- Interactive mode: The terminal can request the base station the number of preferred maximum / minimum active carriers.

The above-described classification of the carrier management mode is exemplary, and the carrier management mode may be configured with fewer modes or more.

Hereinafter, a specific mode in which the above-described carrier management mode is reported to the base station will be described with reference to Tables 6 and 7. [

Table 6 shows an example of a form of a carrier management request message for the UE to inform the base station of the carrier management mode according to another embodiment of the present invention.

Syntax Size (bit) Notes Carrier Management Request message { Management Message type = xxx 8 Carrier Management Request Message Carrier Management Request type 2 0b00: secondary carrier management 0b01: primary carrier change 0b10: carrier switching 0b11: reserved If (message type == 00) { Secondary carrier management    Carrier management mode 2 0b00: Static Mode  0b01: Dynamic Mode  0b10: Interactive Mode 0b11: reserved     If (Carrier management mode == 10) { In Interactive Mode         Maximum Number of carriers TBD Represents the maximum number of carriers that the UE can monitor the control channel.         Minimum Number of carriers TBD Represents the minimum number of carriers that the UE can monitor the control channel.     } } If (message type == 01) {          ... TBD Required parameters can be defined when the primary carrier change is triggered (requested) by the terminal } If (message type == 10) {          ... TBD Required parameters can be defined when carrier switching is triggered (requested) by the terminal } }

Referring to Table 6, a carrier management mode (Carrier management mode) field is additionally included in the Carrier Management Request (AAI_CM-REQ) message according to the present embodiment to indicate a carrier management mode requested by the terminal to the base station. If the corresponding field is set to 0b10, the maximum number of active carriers field and the minimum number of active carriers field may be further included in the present message.

The detailed description of each field is similar to that described with reference to Tables 2 to 4 of the first embodiment of the present invention, and will be omitted for the sake of brevity.

Next, Table 7 shows an example of a carrier management mode report message for informing the base station of the carrier management mode according to another embodiment of the present invention.

Syntax Size (bit) Notes Carrier Management Mode Report { Carrier management mode 2  0b00: Static Mode  0b01: Dynamic Mode  0b10: Interactive Mode 0b11: reserved If (Carrier management mode == 10) { In Interactive Mode     Maximum Number of carriers TBD Represents the maximum number of carriers that the UE can monitor the control channel.     Minimum Number of carriers TBD Represents the minimum number of carriers that the UE can monitor the control channel. } }

Referring to Table 7, the carrier management mode report message according to the present embodiment includes a carrier management mode field as a message newly defined in the present invention to report only the carrier management mode, And can indicate the carrier management mode. If the corresponding field is set to 0b10, the maximum number of active carriers field and the minimum number of active carriers field may be further included in the present message.

Terminal and base station structure

Hereinafter, a terminal and a base station (FBS, MBS) in which the embodiments of the present invention can be performed will be described as another embodiment of the present invention.

The terminal may operate as a transmitter in an uplink and as a receiver in a downlink. In addition, the base station can operate as a receiver in an uplink and operate as a transmitter in a downlink. That is, the terminal and the base station may include a transmitter and a receiver for transmission of information or data.

The transmitter and receiver may comprise a processor, module, part and / or means, etc., for performing embodiments of the present invention. In particular, the transmitter and receiver may include a module (means) for encrypting the message, a module for interpreting the encrypted message, an antenna for transmitting and receiving the message, and the like. An example of such a transmitting end and a receiving end will be described with reference to FIG.

7 is a block diagram showing an example of a structure of a transmitting end and a receiving end, according to another embodiment of the present invention.

Referring to FIG. 7, the left side shows the structure of the transmitting end, and the right side shows the structure of the receiving end. Each of the transmitting end and the receiving end includes antennas 5 and 10, processors 20 and 30, transmission modules (Tx modules 40 and 50), reception modules (Rx modules 60 and 70), and memories 80 and 90 . Each component can perform a function corresponding to each other. Each component will be described in more detail below.

The antennas 5 and 10 transmit the signals generated by the transmission modules 40 and 50 to the outside or receive radio signals from the outside and transmit the signals to the reception modules 60 and 70. If a multi-antenna (MIMO) function is supported, more than two may be provided.

The antenna, the transmitting module and the receiving module can together form a wireless communication (RF) module.

The processors 20 and 30 typically control the overall operation of the mobile terminal as a whole. For example, a controller function, a service characteristic, and a MAC (Medium Access Control) frame variable control function, a handover function, an authentication and encryption function, and the like for performing the above- . More specifically, the processors 20 and 30 may perform overall control for performing the handover procedure shown in FIGS.

In particular, the processor of the mobile terminal can acquire information on the available carriers of the base station through a multicarrier-related message (for example, AAI_MC-ADV, AAI_Global-config) and transmits an AAI_MC-REQ / RSP message exchanged with the base station To obtain allocated carrier information. In addition, the processor of the mobile terminal can determine an instruction regarding the carrier management through the AAI_CM-CMD message and notify the base station of the fulfillment of the corresponding instruction through the AAI_CM-IND message. In this case, when the instruction of the base station is the activation of the secondary carrier, the transmission of the AAI_CM-IND message is preferably performed before or at the time indicated by the Activation Deadline field included in the AAI_CM-CMD message.

At this time, the processor of the UE can control the base station to request the base station to activate its allocated carrier by notifying the base station of its state (e.g., power level) through various methods.

In addition, the processor of the terminal may perform an overall control operation of the operation procedure described in the above embodiments.

The transmission modules 40 and 50 may perform predetermined coding and modulation on the data to be transmitted to the outside and transmit the data to the antenna 10 after being scheduled from the processors 20 and 30.

The receiving modules 60 and 70 decode and demodulate the radio signals received from the outside through the antennas 5 and 10 to restore them in the form of original data and transmit them to the processors 20 and 30 .

The memories 80 and 90 may store programs for processing and controlling the processors 20 and 30, and may perform functions for temporary storage of input / output data. The memories 80 and 90 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory A static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM) Magnetic disk, magnetic disk, magnetic disk, or optical disk.

The base station includes a controller function for performing the above-described embodiments of the present invention, orthogonal frequency division multiple access (OFDMA) packet scheduling, time division duplex (TDD) packet scheduling and channel multiplexing , MAC frame variable control function according to service characteristics and propagation environment, high speed traffic real time control function, handover function, authentication and encryption function, packet modulation / demodulation function for data transmission, high speed packet channel coding function and real time modem control function Etc. may be performed through at least one of the modules described above, or may include additional means, modules, or portions for performing such functions.

The 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.

Claims (18)

A method for performing carrier management in a terminal in a multi-carrier broadband wireless access system,
The base station transmits activation request information indicating a carrier management mode of the terminal in consideration of a power state of the terminal through a primary carrier, and the carrier management mode includes a first mode and a second mode, step;
Receiving a carrier management request message for activating at least one secondary carrier indicated by the activation request information from the base station; And
And transmitting a carrier management indication message for reporting the carrier activation state to the base station after activating the at least one secondary carrier,
When the carrier management mode is the first mode, the activation request information further includes information related to the number of secondary carriers to be activated,
When the carrier management mode is the second mode, information on the number of secondary carriers to be activated is not included in the activation request information in order to activate all the secondary carriers supported by the terminal,
Wherein the power state of the second mode is greater than the power state of the first mode. The method according to claim 1,
Wherein the activation request information includes at least one of a maximum number and a minimum number of requests for activation of the at least one secondary carrier when the activation request information further includes information related to the number of secondary carriers to be activated. The method according to claim 1,
The activation request information,
Wherein the message is transmitted to the base station via any one of a medium access control (MAC) management message, an extension header, or a signaling header. delete A method for a base station managing a carrier of a terminal in a broadband wireless access system supporting multi-
Receiving activation request information indicating a carrier management mode of the terminal in consideration of a power state of the terminal through a primary carrier from the terminal, and the carrier management mode includes a first mode and a second mode, step;
Transmitting a carrier management request message for activating at least one second carrier indicated by the activation request information to the terminal; And
Receiving a carrier management indication message for reporting a carrier activation state from the terminal after the at least one secondary carrier is activated,
When the carrier management mode is the first mode, the activation request information further includes information related to the number of secondary carriers to be activated,
When the carrier management mode is the second mode, information on the number of secondary carriers to be activated is not included in the activation request information in order to activate all the secondary carriers supported by the terminal,
Wherein the power state of the second mode is greater than the power state of the first mode. 6. The method of claim 5,
Wherein the activation request information includes at least one of a maximum number and a minimum number of requests for activation of the at least one secondary carrier when the activation request information further includes information related to the number of secondary carriers to be activated. 6. The method of claim 5,
The activation request information,
Wherein the information is received from the terminal via any one of a medium access control (MAC) management message, an extension header, or a signaling header. delete A mobile terminal supporting a multi-carrier operation in a broadband wireless access system,
A processor; And
And a wireless communication (RF) module for transmitting and receiving a wireless signal to and from the outside under the control of the processor,
Wherein the processor transmits activation request information indicating a carrier management mode of the terminal to the base station via a primary carrier in consideration of the power state of the terminal and the carrier management mode includes a first mode and a second mode, Mode, receiving a carrier management request message for activating at least one secondary carrier indicated by the activation request information from the base station, activating the at least one secondary carrier, To transmit a carrier management indication message to report a carrier activation status,
Wherein if the carrier management mode is the first mode, the activation request information further includes information related to the number of secondary carriers to be activated, and when the carrier management mode is the second mode, all of the secondary carriers supported by the terminal Wherein the activation request information does not include information on the number of secondary carriers to be activated, and the power state of the second mode is greater than the power state of the first mode. 10. The method of claim 9,
Wherein the activation request information includes at least one of a maximum number and a minimum number of requests for activation of the at least one secondary carrier when the activation request information further includes information related to the number of secondary carriers to be activated. 10. The method of claim 9,
The activation request information,
And is transmitted to the base station through any one of a medium access control (MAC) management message, an extension header, and a signaling header.

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