KR101210598B1 - method and apparatus for scanning in multi-carrier communication system - Google Patents

Abstract

Provided are a scanning method and apparatus for a mobile communication system supporting multiple carriers. Scanning method for this, the mobile station supporting a multi-carrier including a first carrier and a second carrier requesting the allocation of the scanning interval to the serving base station using the first carrier, and the scanning interval from the serving base station Receiving a response message specifying a and scanning the neighbor base station using the first carrier or the second carrier in the scanning interval. While the neighboring base station is scanned using the first carrier or the second carrier, transmission and reception of transaction data through the remaining carriers continues without interruption.

Multi-carrier, scanning, first carrier

Description

Method and apparatus for scanning in multi-carrier communication system

An embodiment of the present invention relates to a scanning method and apparatus of a mobile communication system supporting multiple carriers.

The present invention is derived from research conducted as part of the Ministry of Knowledge Economy's information and communication standard development support project [Task Management Number: 2008-P1-01-06K51, Task name: WiBro Evol. Standardization technology research].

The state of a mobile station successfully connected to a serving BS in a mobile communication environment is classified into a connected state, and is an active mode for transmitting and receiving data traffic according to an operation performed by the mobile station. It can be subdivided into a power saving mode for an idle situation and a scanning mode for collecting information of a neighbor BS.

In a mobile communication environment using multiple carriers, a mobile station is connected to a base station through one frequency carrier, and the base station manages the state and mobility of the mobile station through the frequency carrier. The frequency carrier used by the mobile station for connection with the base station is called a primary carrier, and the mobile station transmits and receives data traffic with the serving base station through the first carrier. The mobile station may also additionally use a secondary carrier for the transmission and reception of traffic.

The first carrier is a fully configured carrier frequency having all of a synchronization channel, a broadcast and multicast channel, and a unicast control channel for controlling data transmission and reception, each mobile station. Has only one carrier as the first carrier in the serving base station. In contrast, the second carrier may be configured with a fully configured carrier frequency, but may also be configured with a partially configured carrier frequency configured only with control channels necessary for data transmission and reception.

When a mobile station supporting multiple carriers performs scanning to obtain information of neighboring base stations, the mobile station stops transmitting and receiving data traffic with the serving base station for a predetermined period of time and performs only scanning of other neighboring base stations. In addition, one carrier may perform scanning through another carrier while transmitting and receiving data traffic with the serving base station. To this end, the conventional mobile communication system determines the state of the mobile station in consideration of the operating states of all the carriers as a whole, and prescribes to manage the state and mobility of the mobile station, including the scanning operation of the mobile station, in particular through the first carrier. .

Accordingly, an embodiment of the present invention seeks to provide a method of performing scanning without interruption of data transmission and reception using any carrier while complying with the conventional regulations for the scanning operation of a mobile station.

An aspect of the present invention relates to a scanning method of a mobile station supporting a multi-carrier including a first carrier and a second carrier in a multi-carrier system, and assigning a scanning interval to a serving base station using the first carrier. Requesting, receiving a response message specifying a scanning interval and a carrier to be used for scanning from the serving base station, and scanning a neighboring base station using the carrier designated by the response message in the scanning interval. .

If the carrier designated by the response message is the second carrier, a traffic transaction with the serving base station is performed through the first carrier while scanning is performed using the second carrier in the scanning interval. The target carrier of the neighboring base station scanning through the second carrier is a fully configured carrier configured with a synchronization channel, a broadcast channel, and a control channel of a traffic transaction for the neighboring base station.

If the carrier designated by the response message is the first carrier, a traffic transaction with the serving base station is performed through the second carrier while scanning is performed using the first carrier in the scanning interval.

Another aspect of the present invention relates to a scanning apparatus supporting multiple carriers including a first carrier and a second carrier, the transaction module performing transmission and reception of data traffic with a serving base station using the first carrier, and a serving; And a scanning control module for receiving a message specifying a scanning interval and a carrier for scanning from a base station, and a scanning module scanning a neighboring base station using a carrier designated by the message in the scanning interval.

Here, when the carrier designated by the message of the serving base station is a second carrier, the scanning module performs a traffic transaction with the serving base station through the first carrier while performing scanning using the second carrier in the scanning interval. Do this.

Further, when the carrier designated by the message of the serving base station is the first carrier, the scanning module performs a traffic transaction with the serving base station through the second carrier while the scanning module performs scanning using the first carrier in the scanning interval. Do this.

According to the exemplary embodiment of the present invention, scanning can be performed without interruption of data transmission and reception while complying with the existing regulations on the scanning operation of the mobile station, and arbitrary carriers can be used for the scanning operation, so as to meet the purpose of the multi-carrier scheme. Resources can be used efficiently

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification. In addition, when any part of the specification is to "include" any component, which means that it may further include other components, except to exclude other components unless specifically stated otherwise.

In this specification, a mobile station (MS) is a mobile station, a user equipment (UE), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS). It may also refer to an access terminal (AT) or the like, and may include all or some functions of a mobile terminal, a terminal, a mobile terminal, a subscriber station, a portable subscriber station, an access terminal, and the like.

In the present specification, a base station (BS) is an evolved Node-B (eNodeB), an access point (Access Point, AP), a radio access station (Radio Access Station, RAS), Node-B (Node-B), transmission Or, it may refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, or the like, and all or a base station, an access point, a radio access station, a node B, a transmitting or receiving base station, an MMR-BS, or the like. It may also include some functionality.

Throughout the specification, the second carrier refers to any other frequency other than the first carrier included in the multicarrier, and is not limited to the multicarrier consisting of two carriers.

1 is a structural diagram briefly illustrating a mobile communication system to which embodiments of the present invention are applied.

The mobile station 100 and the base stations 210, 220, and 230 of the mobile communication system to which embodiments of the present invention are applied support multiple carriers.

In embodiments of the present invention, the mobile station 100 performs a scanning operation on any of a plurality of carriers, and without interruption with the serving BS 210 via another carrier not used for scanning. Send and receive general data. This will be described in more detail with reference to FIG. 1 as follows.

The mobile station 100 performs uplink and downlink data transactions using the multi-carrier with the serving base station 210 in the active mode, and is currently serving the serving base station. If the signal of 210 becomes weak or irregular, it starts scanning for neighbor BSs 220 and 230 for handover.

That is, when a situation occurs in which the mobile station 100 satisfies a predetermined condition that needs to be updated, a message for requesting allocation of a scanning interval to the serving base station 210 through a first carrier among multiple carriers ( For example, MOB_SCN-REQ) is transmitted. In this case, the request message may include information about a carrier requesting that the scanning interval be allocated. In response, the serving base station 210 transmits a response message (for example, MOB_SCN-RSP) specifying the size of the scanning interval to the mobile station 100 through the first carrier. The response message includes information on a carrier to be used for scanning in the corresponding scanning interval.

An operation section in which the mobile station 100 scans the neighbor base stations 220 and 230 is called a scanning section, and the scanning section is alternately allocated to the operating section in which general data is transmitted and received. Scanning of neighboring base stations 220 and 230 is performed on a fully configured carrier of neighboring base stations.

The mobile station 100 performs scanning of the neighbor bases 220 and 230 through the first carrier or the second carrier designated to be used for scanning during the scanning period specified in the response message. In this case, another carrier that does not perform scanning performs data traffic transmission and reception with the serving base station 210 without interruption. To this end, another carrier that does not perform scanning should be configured with a control channel necessary for transmitting and receiving data traffic.

Hereinafter, the specific examples will be described as follows.

≪ Example 1 >

Embodiment 1 relates to a case where a scanning related control message is transmitted and received on a first carrier and an actual scanning operation is performed on a second carrier.

FIG. 2 is a signal flowchart illustrating a scanning operation according to the first embodiment, and FIG. 3 is a flowchart sequentially illustrating the scanning operation according to the signal flowchart.

In the active mode, the mobile station 100 performs uplink and downlink data traffic transactions with the serving base station 210 using the first carrier and the second carrier. (S101).

When the mobile station 100 monitors the reception signal from the serving base station 210 and determines that a handover is necessary (S102), the mobile station 100 allocates a scanning interval to the serving base station 210 through the first carrier. In step S103, a message (for example, MOB_SCN-REQ) requesting the request is transmitted.

Upon receiving the request message, the serving base station 210 determines whether to allocate a scanning interval in consideration of a communication environment for the mobile station 100, and if it is determined that scanning is necessary, designates a size of the scanning interval and a carrier to be used for scanning. A response message (for example, MOB_SCN-RSP) is transmitted to the mobile station 100 through the first carrier (S104).

The serving base station 210 may arbitrarily instruct a scanning operation to the mobile station 100 via the first carrier even if there is no request message (eg, MOB_SCN-REQ) from the mobile station 100. In this case, the serving base station may transmit an instruction of a scanning operation through a predetermined message (for example, MOB_SCN-RSP).

Receiving the response message, the mobile station 100 switches the operating mode of the mobile station 100 from an active mode to a scanning mode regardless of an operating state of a frequency other than the first carrier (S105). The second carrier is designated as a carrier for scanning as specified in the response message. Thereafter, only the scanning operation with neighboring base stations 220 and 230 is performed as the second carrier while in the scanning mode, and transmission and reception of general data with the serving base station 210 is excluded.

In the scanning mode, when the scanning interval arrives, the mobile station 100 performs scanning on neighboring bases 220 and 230 through the second carrier (S106), while also transmitting and receiving general data through the first carrier. It performs (S107). In the scanning mode, when the scanning interval is out of the range, the serving base station 210 transmits / receives general data through the first carrier and the second carrier.

4 is a block diagram schematically showing the configuration of the mobile station 100 performing the scanning operation of the first embodiment. The mobile station 100 according to the first embodiment includes a communication unit 110 and a control unit 120.

The communication unit 110 may include a transmission module 111 including a channel encoder, an mapper, and a modulator, a channel decoder, a demapper, and a demodulator. It includes a receiving module 112 including. The control unit 120 includes a transaction module 121, a monitoring module 122, a scanning control module 123, a frequency designation module 124, and a scanning module 124.

The channel encoder of the transmitting module 111 receives predetermined streams of information bits and encodes them according to a predetermined coding scheme to form coded data. The mapper maps the encoded data of the information bit stream into symbols representing positions according to a predetermined amplitude and phase constellation. The modulator modulates a transmission symbol according to a multiple access modulation scheme such as a single-carrier modulation scheme such as CDMA or a multi-carrier modulation scheme such as OFDM. The channel decoder, demapper, and demodulator of the reception module 112 play opposite roles to the channel encoder, mapper, and modulator, respectively.

The controller 120 includes a transaction module 121, a monitoring module 122, a scanning control module 123, and a scanning module 124.

The transaction module 121 transmits and receives data traffic with the serving base station 210 through the communication unit 110.

The monitoring module 122 monitors the reception signal of the reception module 112 and notifies the scanning control module 123 of a situation in which a handover is required. For example, when the signal of the serving base station 210 received through the receiving module 112 is smaller than the preset signal strength value, it may notify the scanning control module 123 of this.

The scanning control module 123 transmits a scanning control request message (for example, MOB_SCN-REQ) to the serving base station 210 through the first carrier upon notification of the monitoring module 122, and sends the scanning control module 123 from the serving base station 210. When a response message (eg MOB_SCN-RSP) to the request message is received, the operation mode of the mobile station 100 is switched to the scanning mode. Alternatively, even if the scanning control module 123 does not transmit the scanning control request message (for example, MOB_SCN-REQ) to the serving base station 210, the message indicating the scanning operation by the serving base station by its own determination (for example, MOB_SCN). -RSP) may switch the operation mode of the mobile station 100 to the scanning mode accordingly.

In the scanning mode, as the mobile station 100 enters the scanning interval specified in the response message, the scanning module 124 scans the neighbor bases 220 and 230 through the second carrier designated in the response message. At this time, the transaction module 121 performs the transmission and reception of general data with the serving base station 210 through the first carrier without interruption.

In the scanning mode, when the mobile station 100 leaves the scanning interval, the transaction module 121 again transmits and receives general data with the serving base station 210 through the first carrier and the second carrier.

<Example 2>

Embodiment 2 relates to a case where a scanning related control message is transmitted and received on a first carrier and an actual scanning operation is performed on a first carrier.

FIG. 5 is a signal flowchart illustrating a scanning operation according to the second embodiment, and FIG. 6 is a flowchart sequentially illustrating a scanning operation according to the signal flowchart.

In the active mode, the mobile station 1000 performs uplink and downlink data transactions with the serving base station 2100 using the first carrier and the second carrier. (S201).

If the mobile station 1000 monitors the received signal from the serving base station 2100 and determines that a handover is necessary (S202), the mobile station 1000 allocates a scanning interval to the serving base station 2100 through the first carrier. A message (eg MOB_SCN-REQ) requesting the transmission is transmitted (S203).

Upon receiving the request message, the serving base station 2100 determines whether to allocate a scanning interval in consideration of a communication environment for the mobile station 1000, and if it is determined that scanning is necessary, designates a size of the scanning interval and a carrier to be used for scanning. A response message (for example, MOB_SCN-RSP) is transmitted to the mobile station 1000 through the first carrier (S204).

The serving base station 2100 may arbitrarily instruct a scanning operation to the mobile station 1000 through the first carrier even if there is no request message (eg, MOB_SCN-REQ) from the mobile station 1000. In this case, the serving base station may transmit an instruction of a scanning operation through a predetermined message (for example, MOB_SCN-RSP).

Receiving the response message, the mobile station 1000 switches the operating mode of the mobile station 1000 from an active mode to a scanning mode regardless of an operating state of a frequency other than the first carrier (S205). As a carrier for scanning, a first carrier is designated as specified in the response message. Subsequently, in the scanning period in the scanning mode, only the scanning operation with the neighbor base stations 2200 and 2300 is performed as the first carrier, and transmission and reception of general data with the serving base station 2100 is excluded.

In the scanning mode, when the scanning interval arrives, the mobile station 1000 performs scanning on neighboring bases 2200 and 2300 through the first carrier (S206), while also transmitting and receiving general data through the second carrier. It performs (S207). In the scanning mode, when the scanning interval deviates, the general data is transmitted and received with the serving base station 2100 through the first carrier and the second carrier.

FIG. 7 is a block diagram schematically showing the configuration of the mobile station 1000 performing the scanning operation of the second embodiment. The mobile station 1000 of the second embodiment includes a communication unit 1100 and a control unit 1200. Here, since the communication unit 1100 is the same as the communication unit 110 of the first embodiment, only the control unit 1200 will be described here.

The controller 1200 includes a transaction module 1210, a monitoring module 1220, a scanning control module 1230, and a scanning module 1240.

The transaction module 1210 transmits and receives data traffic with the serving base station 2100 through the communication unit 1100.

The monitoring module 1220 monitors the reception signal from the serving base station 210 and notifies the scanning control module 1230 when a situation requiring handover arrives.

The scanning control module 1230 transmits a scanning control request message (for example, MOB_SCN-REQ) to the serving base station 2100 through the first carrier upon notification of the monitoring module 1220, and transmits the information from the serving base station 2100. When a response message (eg MOB_SCN-RSP) to the request message is received, the operation mode of the mobile station 1000 is switched to the scanning mode. Alternatively, even if the scanning control request message is not transmitted, when the service base station 2100 sends a predetermined message (for example, MBO_SCN-RSP) indicating the scanning, the mobile station 1000 switches the operation mode to the scanning mode.

In the scanning mode, as the mobile station 1000 enters the scanning section, the scanning module 1240 performs scanning of neighboring bases 2200 and 2300 through the first carrier. In this case, the transaction module 1210 performs transmission and reception of general data with the serving base station 2100 through the second carrier without interruption.

In the scanning mode, when the mobile station 1000 leaves the scanning period again, the transaction module 1210 performs transmission and reception of general data with the serving base station 2100 through the first carrier and the second carrier again.

The embodiments of the present invention described above are not implemented only through the method, but may be implemented through an apparatus, a program for realizing a function corresponding to the configuration of the embodiments of the present invention, or a recording medium on which the program is recorded. The implementation can be easily implemented from the description of the above-described embodiments.

In addition, although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of the invention.

1 is a structural diagram briefly illustrating a mobile communication system to which embodiments of the present invention are applied.

2 is a signal flowchart for describing a scanning operation according to the first embodiment.

3 is a flowchart sequentially illustrating a scanning operation according to the signal flowchart of FIG. 2.

4 is a block diagram schematically showing the configuration of a mobile station for performing the scanning operation of the first embodiment.

5 is a signal flowchart for describing a scanning operation according to the second embodiment.

6 is a flowchart sequentially illustrating a scanning operation according to the signal flowchart of FIG. 5.

FIG. 7 is a block diagram schematically showing the configuration of a mobile station for performing the scanning operation of Embodiment 2. FIG.

Claims (17)

A scanning method of a mobile station supporting multiple carriers including a first carrier and a second carrier in a multicarrier system, Transmitting a scanning request (SCN-REQ) message to a serving base station using the first carrier; Receiving a scanning response (SCN-RSP) message including a scanning interval for scanning from the serving base station using the first carrier; And Scanning a neighbor base station using a second carrier in the scanning interval Including, In the scanning period, a traffic transaction with the serving base station is performed through the first carrier while scanning is performed using the second carrier. The method of claim 1, And the scanning request message includes request information for a carrier used for scanning. delete The method of claim 1, Switching the operation mode of the mobile station to a scanning mode when the response message is received from the serving base station. The method of claim 1, The target carrier of the neighbor base station scanning through the second carrier is a fully configured carrier configured with a synchronization channel, a broadcast channel and a control channel of a traffic transaction for the neighbor base station. delete A scanning method of a mobile station supporting multiple carriers including a first carrier and a second carrier in a multicarrier system, Requesting allocation of a scanning interval to a serving base station using the first carrier; Receiving a response message specifying the scanning interval and a carrier to be used for scanning from the serving base station; And Scanning a neighbor base station using a carrier designated by the response message in the scanning interval; Including, The carrier designated by the response message is the first carrier, In the scanning period, a traffic transaction with the serving base station is performed through the second carrier while scanning is performed using the first carrier. The method of claim 7, wherein Switching the operation mode of the mobile station to a scanning mode when the response message is received from the serving base station. In the scanning apparatus for supporting multiple carriers including a first carrier and a second carrier, A scanning request (SCN-REQ) message is transmitted to a serving base station using the first carrier, and a scanning response (SCN-RSP) message including a scanning interval for scanning from the serving base station is scanned using the first carrier. Receiving a scanning control module; A scanning module scanning a neighbor base station using the second carrier in the scanning interval; And A transaction module for communicating with the serving base station using the first carrier and the second carrier, The transaction module performs a traffic transaction with the serving base station using the first carrier while the scanning module scans the neighbor base station using the second carrier. Scanning apparatus of a multi-carrier system. delete delete The method of claim 9, wherein the scanning control module And scanning the mobile station to switch the operation mode of the mobile station to the scanning mode when the message is received from the serving base station. 10. The method of claim 9, And a target carrier of a neighboring base station scanning through the second carrier is a fully configured carrier configured with a synchronization channel, a broadcast channel, and a control channel of a traffic transaction for the neighboring base station. delete In the scanning apparatus for supporting multiple carriers including a first carrier and a second carrier, A scanning control module receiving a message specifying a scanning interval and a carrier to perform scanning from a serving base station; A scanning module scanning a neighbor base station using a carrier designated by the message in the scanning interval; And A transaction module for communicating with the serving base station using the first carrier and the second carrier, The carrier designated by the message is the first carrier, The transaction module In the scanning period, the scanning device of the multi-carrier system for performing a traffic transaction with the serving base station via the second carrier while scanning using the first carrier. The method of claim 15, wherein the scanning control module And scanning the mobile station to switch the operation mode of the mobile station to the scanning mode when the message is received from the serving base station. A method of managing a multiple carrier comprising a first base station and a second carrier by a serving base station, Receiving a scanning request message through a first carrier from a terminal, and Transmitting a scanning response message including a scanning interval to the terminal to scan a neighbor base station through a second carrier during the scanning interval; And the serving base station performs a traffic transaction with the terminal through the first carrier during the scanning interval.

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