KR20120013187A - Control information exchanging method for efficient radio resource management - Google Patents

Abstract

PURPOSE: A control information exchanging method for efficient wireless resource management is provided to efficiently manage wireless resources to transmit uplink control information. CONSTITUTION: A base station(202) sets at least one of available component carriers in a terminal(201). The base station receives wireless channel information for the set component carrier from the terminal. The base station determines a component carrier to activate among the component carriers. The base station directs to activate the determined component carrier. The base station transmits scheduling information and control information related to setup.

Description

CONTROL INFORMATION EXCHANGING METHOD FOR EFFICIENT RADIO RESOURCE MANAGEMENT}

The present invention relates to a control information transmission technique for allocating and changing radio resources for uplink control according to activation and deactivation of a plurality of component carriers in a mobile communication system supporting a carrier aggregation function using multiple component carriers.

In the current general mobile communication system, an uplink control information transmission radio resource allocation method is applied based on a single carrier. In addition, in order to support a multi-component carrier (CC) in a general mobile communication system, uplink control information transmission radio resource setup configured for a single carrier may be configured for radio resource transmission for uplink control information in consideration of multiple component carriers. What is needed is a method and procedure for transmitting control information informing of assignments and changes.

The present invention provides a signaling method and procedure for changing radio resource allocation and control information for uplink control according to activation and deactivation of multiple component carriers.

According to an embodiment of the present invention, a method of exchanging control information for efficient radio resource management in a base station comprises: a first step of setting at least one component carrier to a terminal from among component carriers available at the base station; A second step of receiving radio channel information on the set component carrier from the terminal and determining a component carrier to be activated among the component carriers; And a third step of instructing activation of the determined component carrier.

In this case, the base station transmits scheduling information and control information related to the setting through one of the third and the third steps.

The base station decides to provide a service using a plurality of component carriers for any terminal, and in consideration of the load status of the control channel and the traffic channel (or all) of the component carriers available at the base station The component carrier may be set to the corresponding terminal.

The base station may receive the downlink measurement report transmitted by the terminal and transmit component carrier activation control information, which is a control procedure allowing information transmission and reception through a plurality of component carriers preset to the corresponding terminal.

In addition, after activating any component carrier, the base station may perform the deactivation control procedure again when there is no need to use the component carrier for reasons such as deterioration of radio channel quality or traffic reduction.

The base station may receive channel quality information (CQI) for the downlink carrier or ACK / NACK feedback information for the HARQ operation from the terminal, the base station may transmit control information to the terminal to receive the corresponding control information Send scheduling information and settings so that

The base station may use existing defined control information or define new control information to transmit control information related to scheduling information and configuration to the terminal for transmitting CQI information or ACK / NACK feedback information of the terminal.

The present invention relates to a method of exchanging control information for efficient radio resource management. When providing a service using a plurality of component carriers, the present invention can efficiently operate radio resources for transmitting uplink control information and control information. Can stably and efficiently notify the terminal.

1 is a diagram illustrating a base station supporting a multi-carrier function using four component carriers.
2 shows a procedure of transmitting control information for CQI transmission or ACK / NACK feedback information transmission through an RRC message.
3 shows a procedure of transmitting control information for CQI transmission or ACK / NACK feedback information transmission using MAC control information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In a mobile communication system supporting Carrier Aggregation (CA), a base station (eNB) of a network may determine whether a UE supports a CA function, traffic amount of a service being provided, and a required quality of service (QoS). In consideration of this, it is determined whether to provide a service using only a single component carrier (CC) or whether to provide a service using an additional resource, that is, a plurality of component carriers. As described above, in order to provide a service using a plurality of component carriers, the service may be divided into a step of configuring to use a plurality of component carriers and a step of activating or deactivating the set of component carriers.

The base station decides to provide a service using a plurality of component carriers for any terminal, and in consideration of the load status of the control channel and the traffic channel (or all) of the component carriers available at the base station The component carrier may be set to the corresponding terminal.

The base station may receive component downlink measurement report transmitted by the terminal and transmit component carrier activation control information, which is a control procedure for allowing information transmission and reception through a plurality of component carriers preset for the terminal, and any component. After activating the carrier, if the component carrier does not need to be used due to a decrease in radio channel quality or traffic reduction, the deactivation control procedure may be performed again.

The base station may receive ACK / NACK feedback information for channel quality information (CQI) or HARQ (Hybrid Automatic Retransmit reQuest) operation for the downlink carrier from the terminal, the base station to control information to the terminal to receive the corresponding control information Scheduling information and settings must be transmitted to transmit the data. For example, the uplink feedback information (ACK / NACK) for HARQ operation for downlink transmission or the channel quality information (CQI) reported by the UE for uplink for scheduling may transmit ACK / NACK information in a single carrier situation. For this purpose, one resource region allocation is required on an uplink control channel (eg, a physical uplink control channel (PUCCH)), and one resource region allocation is required on an uplink control channel for CQI information transmission. Accordingly, in order to provide a service using a plurality of component carriers, one or more resources are allocated on an uplink control channel for transmitting ACK / NACK and CQI information, or uplink control of a plurality of component carriers is performed with one assigned resource. What is needed is a method and procedure for transmitting information.

The base station may utilize existing defined control information or define new control information to transmit control information related to scheduling information and configuration to the terminal for transmitting CQI information or ACK / NACK feedback information of the terminal. It is possible to set at the stage of.

The first method is a method for transmitting scheduling information and control information related to configuration to a terminal in setting at least one of component carriers available in the base station to the terminal.

The second method is a method for transmitting scheduling information and control information related to configuration to a terminal in a step of receiving radio channel information on a component carrier set from a terminal and determining a component carrier to be activated among the set component carriers.

The third method transmits control information related to scheduling information and configuration to the terminal in the step of instructing activation of the determined component carrier. In this case, the indication of activation of the determined component carrier may be transmitted as MAC control information.

An example of transmitting scheduling information and control information related to configuration to a terminal will be described below with reference to FIG. 1.

1 is a diagram illustrating a base station supporting a multi-carrier function using four component carriers.

Referring to FIG. 1, when an arbitrary base station supports the multi-carrier function using four component carriers 110, 120, 130, and 140, the base station provides three component carriers 110, 120, 130 may be set (103). In this case, only the primary carrier 110 PCC may be activated and only the other two component carriers 120 and 130 may be set and may not be activated. As described above, the base station may determine whether to activate a component carrier that is set but not activated based on a downlink measurement report transmitted by the terminal and transmit control information (MAC CE) for activating the component carrier. . The base station may activate the component carrier CC # 2 120 at time point 104 and activate the component carrier CC # 3 130 at time 105 based on the downlink measurement result report transmitted by the terminal.

The first method is a method of transmitting scheduling information and control information related to configuration for transmitting CQI information or ACK / NACK feedback information to the terminal at component carrier configuration time 103, and method 2 includes CC # 2 (120). Is associated with scheduling information and configuration for transmitting CQI information or ACK / NACK feedback information at any point in time between the 103 and 104 view points, and for CC # 3 130 at any point in time between the 103 and 105 view points. A method of transmitting control information to a terminal. The third method is a method of transmitting control information related to scheduling information and configuration for transmitting CQI information or ACK / NACK feedback information for a corresponding component carrier at a time point 104 or 105 which is an activation time point for a component carrier.

In the method of each step, radio resource allocation information for transmitting uplink control information for a plurality of component carriers may be transmitted using an RRC message or MAC control information.

For example, a method of transmitting by using control information (MAC Control Element) of the MAC layer is suitable for the second method and the third method. When transmitting a MAC CE for activating / deactivating component carrier (s) as in the third method, control information related to radio resource allocation for CQI transmission or ACK / NACK feedback information is added to the corresponding activation / deactivation MAC CE. A separate MAC CE can be defined to transmit the corresponding control information.

For example, when a specific carrier is activated, control setting information related to radio resource allocation for CQI transmission or ACK / NACK feedback information transmission for the corresponding component carrier is transmitted to the activation / deactivation MAC CE together or different at the same time ( Or via a newly defined MAC CE. In this case, the MAC CE includes information on resource allocation in the physical layer for CQI transmission or ACK / NACK feedback information transmission.

Alternatively, in case of transmitting control setting information related to radio resource allocation for CQI transmission or ACK / NACK feedback information transmission using MAC CE in the second method, separate MAC control information for this may be configured and transmitted to the terminal. .

The method of using the RRC message to transmit control information for CQI transmission or ACK / NACK feedback information transmission is suitable for the method 1 and method 2 described above. First, as in Method 1, control information for CQI transmission may be transmitted through an RRC control message (RRCConnectionReconfiguration) for carrier configuration at the time of configuring (or adding) a plurality of component carriers. In this case, in consideration of the maximum number of carriers that can be aggregated for a specific terminal, resources in the physical layer for transmitting CQI information of the terminal may be statically allocated in advance.

Alternatively, after setting a plurality of component carriers to the terminal as in the second method, the base station receives a measurement report for mobility and resource allocation from the terminal and activates a specific component carrier in consideration of various circumstances. When determined, the base station may transmit control information for CQI transmission to the terminal prior to transmitting the MAC CE for activation. In this case, an existing RRC control message (RRCConnectionReconfiguration) may be applied or a separate uplink control channel setting for CQI transmission or ACK / NACK feedback information transmission may be defined and transmitted to the terminal through a separate RRC control message. .

Therefore, even after activation or after activation, control information for transmitting CQI or ACK / NACK feedback information may be transmitted to a specific UE through RRC control information.

2 shows a procedure of transmitting control information for CQI transmission or ACK / NACK feedback information transmission through an RRC message.

That is, FIG. 2 illustrates a procedure of transmitting control information for CQI transmission or ACK / NACK feedback information transmission through an RRC message in setting up a plurality of component carriers according to the first method.

2, in step 203, the base station 202 negotiates a service being provided with the terminal 201 or establishes a connection.

In step 204, the base station 202 notifies the terminal 201 that a plurality of component carriers can be set. In step 205, the base station 202 receives the CC measurement and reports the result from the terminal 201. In step 206, the base station 202 determines setting of a plurality of component carriers and determines allocation of uplink control information resources.

In step 207, the base station 202 transmits an RRC connection establishment control message to the terminal 201. At this time, the RRC connection configuration control message may include a separate uplink control channel configuration information for transmitting a plurality of component carrier configuration information, CQI transmission or ACK / NACK feedback information.

In step 208, the base station 202 receives the CC measurement and reports the result from the terminal 201. In addition, the base station 202 determines a component carrier to be activated based on the information reported in step 209.

In step 210, the base station 202 indicates the activation of the component carrier to be activated to the terminal 201. The base station 202 exchanges information with the terminal 201 using a plurality of CCs activated in step 211.

Meanwhile, in the case of FIG. 2, the radio resource for control information for transmitting CQI or ACK / NACK feedback information may be used by the terminal through defining MAC CE information or new MAC CE for activating a corresponding component carrier. Be notified. Or, if there is a change from the preset value, the differential value or the whole of the information can be transmitted.

3 shows a procedure of transmitting control information for CQI transmission or ACK / NACK feedback information transmission using MAC control information.

That is, FIG. 3 illustrates a procedure of transmitting control information for transmitting CQI or ACK / NACK feedback information using MAC control information at the time of activating component carriers after configuring a plurality of component carriers according to the third method. .

Referring to FIG. 3, in step 303, the base station 302 negotiates a service being provided with the terminal 301 or establishes a connection.

In step 304, the base station 302 notifies the terminal 301 that a plurality of component carriers can be set. In step 305, the base station 302 receives the CC measurement and reports the result from the terminal 301. In step 306, the base station 302 determines setting of a plurality of component carriers and determines allocation of uplink control information resources.

In step 307, the base station 302 transmits an RRC connection establishment control message to the terminal 301. In this case, the RRC connection configuration control message may include a plurality of component carrier configuration information.

In step 308, the base station 302 receives the CC measurement and reports the result from the terminal 301. In addition, the base station 302 determines a component carrier to be activated based on the information reported in step 309.

In step 310, the base station 302 instructs activation of a component carrier to be activated to the terminal 301. At this time, when the base station instructs activation of the component carrier to be activated, the base station may transmit additional uplink control channel configuration information for CQI transmission or ACK / NACK feedback information transmission to the terminal 301.

 The base station 302 exchanges information with the terminal 301 using the plurality of CCs activated in step 311.

In steps 2 and 3, steps 205 and 305, which are CC measurement and result reporting steps, may be performed in steps 204 and 304, which are respective component carrier setup procedures, respectively.

Control information for transmitting CQI or ACK / NACK feedback information transmitted from a base station to a UE includes resource allocation and configuration for transmitting CQI or ACK / NACK feedback information in a physical layer.

Scheduling of resources in the physical layer for CQI transmission can be divided as follows. First, it is a somewhat dynamic resource allocation method, which allocates the physical resources required for CQI transmission to each terminal as needed. Another method is a static method in which resources are allocated by the maximum number of component carriers that can be aggregated with a specific terminal regardless of carrier activation. At this time, the pre-allocated resources may be allocated exclusively to each terminal or may be allocated so that some or all of the physical resources overlap.

In addition, a method of allocating resources in the physical layer for CQI transmission may be divided as follows. First, a method of allocating physical resources for CQI transmission according to the number of activated or configured component carriers. For example, if three component carriers are activated or configured, physical resources capable of transmitting three CQIs at the same timing are additionally allocated. That is, this is a method of allocating uplink physical resources for CQI transmission by the number of component carriers set or activated in the same uplink transmission time (or sub-frame). The ACK / NACK feedback information is a method of allocating uplink physical resources for transmitting information corresponding to the number of coding blocks or transport blocks transmitted to a plurality of downlink component carriers.

Another method is a method of sharing the same uplink physical resource for CQI transmission on a time axis, changing a CQI transmission period, and transmitting a CQI by sharing a physical resource. For example, when the UE activates or configures three component carriers, the CQI physical resource is allocated sequentially by assigning CQI physical resources faster (or in the same cycle) than when only one component carrier is configured, and sequentially assigns the CQI information for each component carrier. How to send.

Accordingly, uplink radio resource allocation information for CQI transmission or ACK / NACK feedback transmission transmitted by the base station using RRC control message or MAC CE information may be allocated to radio resource allocation information (transmission time, transmission sub) for transmission of the corresponding control information. Carrier), a corresponding control information transmission cycle, and mapping relationship information between a radio resource for transmitting control information and a component carrier related to the control information.

The present invention assumes a case in which a plurality of carriers can be configured in a terminal operating as a single carrier in a mobile communication system supporting carrier aggregation. When one or more carriers are activated, the base station moves upward. The present invention relates to a method of controlling a terminal to operate with an appropriate setting by transmitting settings that can be changed in a link as control information of a downlink. Similarly, the methods and procedures for radio resources for transmitting control information in the downlink, which can be changed as a plurality of carriers for uplink are aggregated, can also apply mutatis mutandis in the above-described method. For example, when the setting of the PHICH is changed, the changed setting may be applied to the base station and the terminal according to the control information exchange method between the base station and the terminal.

Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Claims (1)

A step of setting a component carrier to a terminal at least one of the component carriers available at the base station;
Receiving a radio channel information on the set component carrier from the terminal and determining a component carrier to be activated from among the component carriers; And
A third step of instructing activation of the determined component carrier,
The base station transmits control information related to scheduling information and configuration through one of the third steps to the first step.
Control information exchange method for efficient radio resource management in a base station.

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