WO2011005061A2 - Handover method in wireless communication system - Google Patents

Handover method in wireless communication system Download PDF

Info

Publication number
WO2011005061A2
WO2011005061A2 PCT/KR2010/004498 KR2010004498W WO2011005061A2 WO 2011005061 A2 WO2011005061 A2 WO 2011005061A2 KR 2010004498 W KR2010004498 W KR 2010004498W WO 2011005061 A2 WO2011005061 A2 WO 2011005061A2
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
base station
pre
handover
terminal
Prior art date
Application number
PCT/KR2010/004498
Other languages
French (fr)
Korean (ko)
Other versions
WO2011005061A3 (en
Inventor
정수정
김주희
김은경
차재선
임광재
이현
윤철식
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR20090063011 priority Critical
Priority to KR10-2009-0063011 priority
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to KR1020100066631A priority patent/KR101720315B1/en
Priority to KR10-2010-0066631 priority
Priority claimed from JP2012519481A external-priority patent/JP5547284B2/en
Publication of WO2011005061A2 publication Critical patent/WO2011005061A2/en
Publication of WO2011005061A3 publication Critical patent/WO2011005061A3/en

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission and use of information for re-establishing the radio link

Abstract

Disclosed is a method for executing handover from a service base station to a target base station for providing service to a terminal in a wireless communication system. The method comprises the steps of: transmitting a handover request message to the service base station; and receiving a handover instruction message, constituting a response to the handover request message, from the service base station. Multi-carriers can be used effectively by pre-allocating multi-carriers immediately before handover, and activating some or all of the multi-carriers immediately after handover.

Description

How to Perform Handover in a Wireless Communication System

The present invention relates to wireless communication, and more particularly, to a method for performing handover in a wireless communication system.

A wireless communication system is a cellular system. The cellular system refers to a system that provides a communication service by dividing a service area into a plurality of cells. Cellular systems can overcome limitations of service area and user capacity. A cell is a particular geographic area where one base station (BS) provides communication services. The terminal belongs to one cell and is connected to the base station of the cell to communicate with the base station.

In a wireless communication system, mobile terminals should be able to constantly communicate with a base station. When the terminal moves from one cell to another cell, the terminal should be disconnected from the existing base station and newly connected to the base station belonging to the moved cell. As such, a procedure for changing a base station due to movement of a terminal is called a handover. In this case, the base station originally connected to the terminal is called a service base station, and the base station to which the terminal is newly connected is called a target base station.

The wireless communication system may be a single carrier system supporting one carrier. In a single carrier system, one carrier is used for data exchange between a base station and a terminal. Since the transmission rate is proportional to the transmission bandwidth, the transmission bandwidth must be increased to support the high rate. However, in some parts of the world, it is not easy to allocate large bandwidth frequencies. In order to efficiently use fragmented small bands, spectral aggregation technology is being developed. Spectral aggregation is also referred to as bandwidth aggregation, carrier aggregation. The spectral aggregation technique is a technique that combines a plurality of physically contiguous or non-contiguous bands in the frequency domain to use a logically large band. Through spectrum aggregation technology, multiple carriers can be supported in a wireless communication system. A wireless communication system supporting multiple carriers is called a multi-carrier system. In a multi-carrier system, one or more carriers are used for data exchange between the base station and the terminal.

However, there is a difference between a handover procedure in a single carrier system and a handover procedure in a multiple carrier system. Therefore, there is a need for an efficient handover method in a wireless communication system supporting multiple carriers.

An object of the present invention is to provide a method for performing handover in a wireless communication system.

According to an aspect of the present invention, a method for performing handover from a serving base station to a target base station by a terminal in a wireless communication system is provided. The method includes sending a handover request message to the serving base station, and receiving a handover indication message that is a response to the handover request message from the serving base station.

The handover request message may include a pre-allocation request indicator indicating whether the terminal receives a pre-assigned multiple carriers from a target base station during handover.

According to another aspect of the present invention, a method for controlling handover of a terminal by a base station in a wireless communication system is provided. The method includes receiving a handover request message from the terminal, and transmitting a handover indication message that is a response to the handover request message to the terminal.

The handover request message includes a pre-allocation request indicator indicating whether the terminal is to be pre-allocated multiple carriers in the target base station during the handover. The handover indication message includes a pre-allocation response indicator indicating whether to pre-allocate multiple carriers in the target base station to the terminal.

An efficient handover method may be provided in a wireless communication system. Thus, overall system performance can be improved.

1 shows an example of a frame structure supporting multiple carriers.

2 is a flowchart illustrating an example of a handover method.

3 is a flowchart illustrating another example of a handover method.

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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of 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, even if the detailed description is omitted, descriptions of parts easily understood by those skilled in the art are omitted.

Throughout the specification and claims, when a part includes a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise.

In the present specification, a terminal is a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), user equipment (user equipment). May refer to a mobile station, a mobile terminal, a subscriber station, a mobile subscriber station, a user device, an access terminal, or the like.

In the present specification, a base station (BS) is an access point (AP), a radio access station (RAS), a node B (Node B), an eNB (evolved-Node B), a base transceiver station (base station) It may also refer to a transceiver station (BTS), a mobile multihop relay-BS (MMR-BS), and the like, and includes all or part of the functions of an access point, a radio access station, a Node B, an eNB, a transceiver base station, an MMR-BS, and the like. You may.

A base station supporting multiple carriers may be referred to as an advanced base station (ABS), and a terminal supporting multiple carriers may be referred to as an advanced mobile station (AMS). The base station described below is an advanced base station, and a terminal means an advanced terminal.

1 shows an example of a frame structure supporting multiple carriers.

Referring to FIG. 1, a frame in the time domain means a fixed duration for data transmission. The base station supports N carriers (carrier # 1, carrier # 2, ..., carrier #N) in the frequency domain, where N is a natural number of two or more. A single carrier terminal is assigned only one carrier from the base station. The multi-carrier terminal is assigned a plurality of carriers from the base station.

N of carrier #n (n = 1, 2, ... N) may be referred to as a physical carrier index for identifying a plurality of carriers supported by the base station. For example, when the base station allocates a carrier having a physical carrier index of 2 to the first terminal, the first terminal transmits and receives data with the base station through carrier # 2. When the base station allocates carriers having physical carrier indexes of 1, 3, and 5 to the second terminal, the second terminal may transmit and receive data with the base station through carrier # 1, carrier # 3, and carrier # 5.

A terminal assigned a plurality of carriers may transmit and receive data using only some of the assigned plurality of carriers. Hereinafter, a carrier that the terminal uses for actually transmitting and receiving data is called an active carrier. The activation carrier may be one or plural.

The terminal has only one carrier among the allocated plurality of carriers as a primary carrier. The primary carrier is a carrier that the terminal uses to exchange traffic data and control information with the base station. If there is one activation carrier, the activation carrier is the primary carrier. If there are a plurality of activation carriers, one of the activation carriers is the primary carrier.

In addition to the activation carrier, a logical carrier index (logical carrier index) may be set between the base station and the terminal. For example, a case where a terminal is allocated carriers having physical carrier indexes 1, 3, and 5 from a base station. Only carrier # 1 and carrier # 3 may be active carriers. Logical carrier index 1 may be set to carrier # 1, and logical carrier index 2 may be set to carrier # 3.

As such, the plurality of carriers may be distinguished from each other by a physical carrier index before their state is used for transmission and reception between the base station and the terminal. The active carrier currently being used for data transmission and reception may be given a logical carrier index. That is, the physical carrier index is an identifier for carriers in one base station, and the logical carrier index is an identifier for carriers in one terminal.

Hereinafter, the carrier index means a physical carrier index and / or a logical carrier index.

2 is a flowchart illustrating an example of a handover method.

2, the terminal transmits a handover request message to the serving base station (S110). In the handover initiated by the terminal, the terminal sends a handover request message to the serving base station to initiate the handover procedure. For example, the handover request message is advanced air interface_handover-request (AAI_HO-REQ).

The service base station receiving the handover request message performs a handover negotiation process by exchanging handover negotiation messages with the target base station. Examples of handover negotiation messages include a handover negotiation request message and a handover negotiation response message. The serving base station and the target base station may exchange handover negotiation messages through a backhaul network or a backbone.

The serving base station transmits a handover negotiation request message to the target base station (S120). The target base station transmits a handover negotiation response message to the serving base station (S130). For example, the handover negotiation request message is a handover-request (HO-REQ), and the handover negotiation response message is a handover-response (HO-RSP).

After negotiation between the serving base station and the target base station, the serving base station transmits a handover indication message to the terminal (S140). The handover indication message is sent in response to the handover request message. For example, the handover indication message is AAI_HO-CMD (advanced air interface_handover-command).

Hereinafter, the handover request message and the handover indication message will be described in detail.

I. Handover request message

The handover request message includes a pre-assignment requirement indicator.

According to the set value, the pre-allocation request indicator may indicate whether the terminal is pre-allocated a plurality of carriers to be used in the target base station. Here, the pre-allocated multiple carriers may be secondary carriers. Hereinafter, for convenience of description, it is assumed that when the pre-allocation request indicator is marked as '1', the terminal indicates that the plurality of carriers in the target base station are to be pre-allocated. If the pre-allocation request indicator is marked as '0', it is assumed that the terminal indicates that the plurality of carriers in the target base station are not pre-allocated.

The following pre-assignment request indicators are explained with specific examples.

1.When the active carrier of the terminal is one primary carrier

(1) When the terminal is using only one carrier among the allocated carriers as the activation carrier, the terminal may want to be pre-allocated the plurality of carriers at the time of handover. At this time, the terminal transmits the handover request message by displaying the pre-allocation request indicator as '1'. In this case, when the base station instructs to perform the handover while maintaining the service with the serving base station (for example, HO Reentry Mode = 1), the terminal performs the handover while continuously receiving the service using the primary carrier which is currently active. can do.

(2) When the terminal intends to use only the primary carrier which is currently active during handover, the terminal transmits a handover request message by displaying a pre-allocation request indicator as '0'.

2. When there are multiple active carriers

(1) When the terminal uses a plurality of carriers as an activation carrier, the terminal may use only a single carrier during handover and the carrier of the target base station may not want to be allocated in advance. At this time, the terminal transmits the handover request message by displaying the pre-allocation request indicator as '0'.

(2) When the terminal intends to be pre-allocated the plurality of activated carriers during handover, the terminal transmits a handover request message by indicating a pre-allocation request indicator as '1'.

The serving base station receiving the handover request message confirms the pre-allocation request indicator. If the pre-allocation request indicator is marked with '1', the serving base station determines whether the target base station can pre-allocate multiple carriers during negotiation with the target base station. To this end, handover negotiation messages may include a field corresponding to a pre-allocation request indicator.

As such, in a wireless communication system supporting multiple carriers, a field regarding whether to allocate multiple carriers in advance may be included in handover related messages. In this way, information on whether to pre-allocate multiple carriers during handover may be used for negotiation in a handover preparation process between a terminal, a service base station, and a target base station.

Ⅱ. Handover Instruction Message

The handover indication message includes a pre-assignment response indicator. The pre-allocation response indicator indicates whether at least one carrier is pre-allocated at the handover of the terminal. For example, if the pre-allocation response indicator indicates 1, it indicates that the target base station allocates multiple carriers in advance. On the other hand, if the pre-allocation response indicator indicates 0, it indicates that the target base station does not allocate multiple carriers in advance. Here, the pre-allocated multiple carriers may be secondary carriers. In addition, the handover indication message may further include information indicating the number of carriers pre-allocated. For example, the number of pre-allocated carriers "0" may indicate that no secondary carriers are pre-allocated.

If the pre-allocation response indicator indicates 1 (i.e., pre-assignment of multiple carriers is made), detailed information on which carriers are to be pre-assigned can be found in the pre-assigned information contained in the handover indication message. carrier information). The pre-allocated carrier information is information on multiple carriers pre-allocated for the terminal according to the agreement between the serving base station and the target base station, and is implicitly allocated according to the physical carrier index of the carrier or the order of each pre-allocated carrier. It may be logical carrier index. Pre-allocated carrier information is delivered to the service base station through a backbone network, and included in the handover indication message and transmitted to the terminal.

The pre-allocated carrier information may further include a center frequency, a bandwidth, a duplex mode, a carrier type, a preamble index, a transmit power, and the like. have. The duplex mode may be classified into a time division duplex (TDD), a frequency division duplex (FDD), or a half-duplex FDD (H-FDD).

If the pre-allocation response indicator indicates 0, the handover indication message does not include the pre-allocation carrier information.

The handover indication message further includes information on which carrier of the pre-allocated multiple carriers to activate and deactivate immediately after handover (hereinafter, carrier activation information).

As an example, the carrier activation information may be a bitmap indicating the activated carrier and the deactivated carrier among the pre-allocated carriers immediately after the handover. For example, suppose there are three pre-allocated multiple carriers: C1, C2, C3. And, it is assumed that the carrier corresponding to the bit indicated by 1 is activated and the carrier corresponding to the bit indicated by 0 is inactivated. If the carrier activation information is 110, C1 and C2 are activated, and C3 is not activated.

As another example, the carrier activation information may be information indicating the number of carriers that are activated among pre-allocated carriers. In this case, the order in which the physical indices of the pre-allocated carriers are listed may be determined according to the number of pre-allocated carriers and the number of activated carriers. For example, if the number of pre-allocated carriers is three and the number of activated carriers is two, a total of three physical indexes are included. The carriers indicated by the first two physical indices in the order listed may be both assignment carriers and activation carriers. The carrier indicated by the last physical carrier index may be an inactive carrier among the assigned carriers. As such, the physical carrier index of each assigned carrier may be listed from the physical carrier index of the active carrier.

The logical carrier index may be set for the activated carrier. The logical carrier index may be automatically assigned according to the order in which the physical carrier index indicating the assigned carrier is provided. That is, physical carrier indices indicating an active carrier among the assigned carriers may be provided sequentially first.

Immediately after network reentry by the terminal, carriers indicated by the activation information of the pre-allocated carriers are activated. After receiving the ranging response message from the target base station, the terminal performs activation on carriers indicated by carrier activation information. After the network re-entry, if the terminal transmits the CM-IND message, the target base station can start data transmission on the activated pre-allocated carrier. If the target base station does not receive the CM-IND message from the terminal within the activation deadline indicated in the ranging response message, the target base station considers that activation of the pre-allocated carrier has failed. In this case, the target base station may transmit a CM-CMD message so that the terminal activates another pre-allocated carrier. Prior to carrier assignment, the serving base station may transmit multi-carrier capability information of the terminal to the target base station through the backbone network. If the terminal receiving the handover indication message including the carrier allocation information recognizes that the multi-carrier setting of the target base station is different from the serving base station through the neighbor base station advertisement information, the terminal requests the multi-carrier request. Through the multi-carrier response message can be newly negotiated with the target base station about the multi-carrier performance.

The handover indication message may further include a reentry mode field. The reentry mode field is a field indicating whether to communicate with a serving base station while performing network reentry to the target base station. According to the set value, the reentry mode field may indicate whether the terminal maintains communication with the serving base station while performing network reentry to the target base station. For example, if the reentry mode field is marked as '1', the terminal maintains communication with the serving base station while performing network reentry to the target base station. If the reentry mode field is marked as '0', the terminal disconnects from the serving base station before performing network reentry to the target base station.

The terminal may receive a handover indication message including a reentry mode field indicating to maintain communication with the serving base station while performing network reentry to the target base station. In this case, the terminal may maintain communication with the serving base station using some of the plurality of carriers, and at the same time may perform a handover procedure using other carriers.

The handover indication message may further include an identifier (ID) of the target base station. The target base station may be plural. When there are a plurality of target base stations, the handover indication message may include IDs of the plurality of target base stations and pre-allocated carrier information for each of the plurality of target base stations.

The carrier type may be divided into a fully configured carrier and a partially configured carrier. The overall configured carrier is a carrier for which all control channels are configured including synchronization, broadcast, multicast and unicast control signaling. The partially configured carrier is a downlink carrier without a paired uplink carrier in FDD or a carrier configured for only downlink transmission in TDD.

The preamble index is a parameter defining the preamble. The preamble is used for initial synchronization between the base station and the terminal, cell search, frequency offset and channel estimation.

The detailed information field may be included in the handover indication message when providing the pre-allocated carrier information. A reference carrier indicator may be used in the detail information field. If the detailed information on any one of the assigned carriers is the same as the detailed information of the reference carrier, the detail information field may indicate the reference carrier through the reference carrier indicator. For example, when the detailed information of the first carrier among the plurality of assigned carriers is the same as the detailed information of the reference carrier, the detail information field indicates the reference carrier instead of the detailed information about the first carrier. That is, the detailed information of the reference carrier may be used as the detailed information of the first carrier.

The reference carrier may be set as a carrier of the serving base station or a carrier of another target base station. The reference carrier indicator may include a base station indicator and a carrier index. For example, it is assumed that the handover indication message includes a detailed information field for each of the plurality of carriers of the first target base station and a detailed information field for each of the plurality of carriers of the second target base station. The detailed information field for each of the plurality of carriers of the second target base station may use the reference carrier indicator. The reference carrier indicator may consist of a base station indicator and a carrier index indicating whether the serving base station or the second target base station. For example, if the base station indicator is indicated as '1', it indicates the serving base station, and if the base station indicator is indicated as '0', it indicates the second target base station. When using the reference carrier indicator in this way, the overhead of the detailed information field can be reduced.

Hereinafter, a configuration of the handover indication message according to the number of activation carriers of the terminal and the value of the pre-allocation request indicator included in the handover request message will be described.

1.When the active carrier of the terminal is one primary carrier

(1) When the terminal transmits the handover request message by displaying the pre-allocation request indicator as '1', the serving base station may transmit the handover indication message by displaying the pre-allocation response indicator as '1'.

In this case, the serving base station may activate any one or more carriers already allocated to the terminal by the serving base station among the plurality of carriers pre-allocated to the terminal by the pre-allocated carrier information. Through this, a plurality of activation carriers of the terminal are provided. The terminal may perform handover using a plurality of activation carriers. A concrete example is given below.

The terminal transmits a handover request message by displaying a pre-allocation request indicator as '1'.

The serving base station may inform the terminal whether the terminal is activated for a plurality of carriers pre-allocated. The serving base station may transmit a handover indication message including a pre-allocation response indicator indicated by '1', pre-allocated carrier information, and carrier activation information. The service base station may further include carrier information to be activated for handover. The activation information (hereinafter additional activation information) for a carrier already allocated for handover at the serving base station may be an index of a carrier to be used at the serving base station, a ranging indicator, and the like. The additional activation information is distinguished from the carrier activation information.

The terminal identifies, from the carrier activation information, a carrier to be newly activated or a carrier to be deactivated in the target base station during or after the handover. The terminal may use the newly activated carrier in the serving base station for handover in a communication with the serving base station or a network reentry procedure to the target base station, or may be used in the target base station after the handover.

Additional activation information can be provided using the pre-allocated carrier information and carrier activation information. That is, if a carrier that has already been assigned to the terminal at the service base station but is not activated is pre-allocated at the target base station and indicated to be activated, the carrier may be regarded as being activated at the service base station. When there is a carrier of the target base station corresponding to the newly activated carrier, the terminal may use the newly activated carrier in the service base station for network reentry. If there is no carrier of the target base station corresponding to the newly activated carrier in the base station, the terminal may use the newly activated carrier for communication with the serving base station.

Even in the case of a handover initiated by the serving base station without receiving the handover request message of the terminal, even if the pre-allocation request indicator of the handover indication message is displayed as '1' and the current terminal activates only the primary carrier frequency, The parameter is used. In addition, when a plurality of carrier frequencies are available in the target base station to which the terminal is handing over, the base station in service is handing over allocation information on a plurality of carrier frequencies to be used by the target base station according to the agreement between the serving base station and the target base station. It can be delivered to the terminal in advance through the instruction message.

(2) When the terminal transmits the handover request message by displaying the pre-allocation request indicator as '0', the serving base station transmits the handover indication message by displaying the pre-allocation response indicator as '0'.

2. When there are multiple active carriers

(1) When the terminal transmits the handover request message by displaying the pre-allocation request indicator as '1', the serving base station may transmit the handover indication message by displaying the pre-allocation response indicator as '1'. The handover indication message may further include pre-allocation carrier information and carrier activation information. In addition, the handover indication message may further include additional activation information, thereby informing the change of the activation state of the activated carrier of the serving base station. That is, it may include information about a carrier to be changed to an inactive state among activated carriers of the serving base station, or may include information about a carrier to be further activated.

The carrier activation information is a bitmap, where each bit corresponds to a carrier of a specific index, and each bit may indicate that a carrier of the corresponding index is activated or deactivated. For example, a specific bit of 1 indicates that a carrier of a corresponding index is activated, and a value of 0 indicates that a carrier of a corresponding index is deactivated.

(2) When the terminal transmits the handover request message by displaying the pre-allocation request indicator as '0', the serving base station transmits the handover indication message by displaying the pre-allocation response indicator as '0'.

In this case, the serving base station may deactivate the remaining carriers except for one of the plurality of active carriers. The one carrier may be a primary carrier. Alternatively, when the one carrier is not the primary carrier, the carrier is newly designated as the primary carrier. The terminal performs a single carrier handover using the one carrier.

3 is a flowchart illustrating another example of a handover method.

Referring to FIG. 3, the serving base station transmits a handover negotiation request message to the target base station (S210). The target base station transmits a handover negotiation response message to the serving base station (S220). After negotiation between the serving base station and the target base station, the serving base station transmits a handover indication message to the terminal (S230). This is a method of performing handover initiated by the serving base station. In the case of the method for performing handover initiated by the base station, the content described in FIG. 2 may be applied as it is. The handover indication message includes a pre-allocation response indicator. If the pre-allocation response indicator is marked with '1', the pre-allocation response indicator further includes information on a carrier to be used in the target base station. Even when the activation carrier of the terminal is one primary carrier, the content of the handover indication message described in FIG. 2 may be applied.

As such, an efficient handover method may be provided in a wireless communication system. In order for the handover to be properly performed without a disconnection time of data transmission and reception with the serving base station, necessary information may be added to the handover related messages. The handover related messages may include information about a carrier that actually performs a network re-entry to the target base station and the target base station and carriers during the handover procedure. By doing this, by performing a handover using multiple carriers in a multi-carrier system, unlike a single carrier handover, handover can be performed without disconnection time of data transmission and reception with a serving base station.

In addition, information on carriers to be used in the target base station may be further included. In this way, the terminal can obtain the multi-carrier information of the target base station. That is, information exchange for multiple carriers in the target base station can be performed during the handover procedure. Therefore, the overall system performance can be improved.

Those skilled in the art will readily recognize additional advantages, objects, and features of the present invention by practicing the present invention through the foregoing description or based on the foregoing description. In addition, the present invention may have unexpected advantages as those skilled in the art implement the present invention based on the above description.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above-described embodiments include examples of various aspects. While not all possible combinations may be described to represent the various aspects, one of ordinary skill in the art will recognize that other combinations are possible. For example, those skilled in the art can use each of the configurations described in the above-described embodiments in combination with each other. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (13)

  1. A method for performing handover from a serving base station to a target base station by a terminal in a wireless communication system,
    Transmitting a handover request message to the serving base station; And
    Receiving a handover indication message in response to the handover request message from the serving base station,
    The handover request message includes a pre-allocation request indicator indicating whether the terminal is pre-assigned to multiple carriers at a target base station during handover.
  2. The method of claim 1,
    The handover indication message includes a pre-allocation response indicator indicating whether multiple carriers are pre-allocated to the terminal.
  3. The method of claim 2,
    If the pre-allocation response indicator indicates that the multi-carrier is pre-allocated to the terminal, the handover indication message further comprises pre-allocated carrier information indicating the physical or logical index of the multi-carrier to be pre-allocated Way.
  4. The method of claim 3, wherein
    The handover indication message further includes carrier activation information indicating a carrier activated or deactivated in the target base station immediately after the handover, among the pre-allocated multiple carriers.
  5. The method of claim 4, wherein
    And the carrier activation information indicates to change all of the carriers except the primary carrier of the serving base station to the inactive state among the pre-allocated multiple carriers.
  6. The method of claim 4, wherein
    The carrier activation information includes information on carrier frequencies of the pre-allocated multiple carriers to change the activated carrier of the serving base station to an inactive state.
  7. The method of claim 4, wherein
    The carrier activation information is characterized in that the carrier is activated in the target base station of the pre-allocated multiple carriers as a bitmap (bitmap).
  8. A method for controlling handover of a terminal by a base station in a wireless communication system,
    Receiving a handover request message from the terminal; And
    And transmitting a handover indication message, which is a response to the handover request message, to the terminal.
    The handover request message includes a pre-allocation request indicator indicating whether the terminal is to be pre-allocated multiple carriers in the target base station when the handover, the handover indication message is a multi-carrier at the target base station to the terminal And a pre-allocation response indicator indicating whether or not to pre-allocate.
  9. The method of claim 8,
    If the pre-allocation response indicator indicates to the terminal that the multi-carrier is pre-allocated at the target base station, the handover indication message further includes pre-allocated carrier information indicating the physical or logical index of the multi-carrier to be pre-allocated Characterized in that the method.
  10. The method of claim 9,
    The handover indication message further comprises additional activation information for activating or deactivating at least one carrier allocated to the terminal by the serving base station at the handover.
  11. The method of claim 10,
    The additional carrier activation information instructs the serving base station to change all of the remaining carriers except the primary carrier among the carriers allocated to the terminal to an inactive state.
  12. The method of claim 10,
    The additional activation information includes information on carrier frequencies for changing at least one carrier assigned to the terminal by the serving base station to an inactive state.
  13. The method of claim 10,
    The additional activation information, characterized in that a bitmap indicating that to activate the carrier assigned by the serving base station among the multiple carriers pre-allocated to the target base station.
PCT/KR2010/004498 2009-07-10 2010-07-09 Handover method in wireless communication system WO2011005061A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR20090063011 2009-07-10
KR10-2009-0063011 2009-07-10
KR1020100066631A KR101720315B1 (en) 2009-07-10 2010-07-09 Method of performing handover in wireless communication system
KR10-2010-0066631 2010-07-09

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012519481A JP5547284B2 (en) 2009-07-10 2010-07-09 Method for performing handover in a wireless communication system
US13/383,209 US9094877B2 (en) 2009-07-10 2010-07-09 Handover method in wireless communication system

Publications (2)

Publication Number Publication Date
WO2011005061A2 true WO2011005061A2 (en) 2011-01-13
WO2011005061A3 WO2011005061A3 (en) 2011-04-28

Family

ID=43429701

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2010/004498 WO2011005061A2 (en) 2009-07-10 2010-07-09 Handover method in wireless communication system

Country Status (1)

Country Link
WO (1) WO2011005061A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014511651A (en) * 2011-03-04 2014-05-15 クゥアルコム・インコーポレイテッドQualcomm Incorporated Adaptive packet-based modulation and coding rate selection for wide bandwidth transmission

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050107254A (en) * 2004-05-07 2005-11-11 삼성전자주식회사 Method and apparatus for handover between sector in mobile orthogonal frequency division multiplexing system
KR20070009707A (en) * 2004-04-15 2007-01-18 콸콤 플라리온 테크놀로지스, 인코포레이티드 Methods and apparatus for selecting between multiple carriers based on signal energy measurements
KR20070081013A (en) * 2006-02-09 2007-08-14 삼성전자주식회사 Method and apparatus for performing an uplink timing synchronization procedure upon handover in a mobile communication system using an orthogonal frequency division multiplexing
KR20070103490A (en) * 2000-01-07 2007-10-23 퀄컴 인코포레이티드 Base station synchronization for handover in a hybrid gsm/cdma network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070103490A (en) * 2000-01-07 2007-10-23 퀄컴 인코포레이티드 Base station synchronization for handover in a hybrid gsm/cdma network
KR20070009707A (en) * 2004-04-15 2007-01-18 콸콤 플라리온 테크놀로지스, 인코포레이티드 Methods and apparatus for selecting between multiple carriers based on signal energy measurements
KR20050107254A (en) * 2004-05-07 2005-11-11 삼성전자주식회사 Method and apparatus for handover between sector in mobile orthogonal frequency division multiplexing system
KR20070081013A (en) * 2006-02-09 2007-08-14 삼성전자주식회사 Method and apparatus for performing an uplink timing synchronization procedure upon handover in a mobile communication system using an orthogonal frequency division multiplexing

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014511651A (en) * 2011-03-04 2014-05-15 クゥアルコム・インコーポレイテッドQualcomm Incorporated Adaptive packet-based modulation and coding rate selection for wide bandwidth transmission
JP2015165676A (en) * 2011-03-04 2015-09-17 クゥアルコム・インコーポレイテッドQualcomm Incorporated Adaptive packet based modulation and coding rate selection for wide bandwidth transmissions
US9160503B2 (en) 2011-03-04 2015-10-13 Qualcomm Incorporated Method and apparatus supporting improved wide bandwidth transmissions
KR101766189B1 (en) 2011-03-04 2017-08-23 퀄컴 인코포레이티드 Adaptive packet based modulation and coding rate selection based for wide bandwidth data transmissions
US9813206B2 (en) 2011-03-04 2017-11-07 Qualcomm Incorporated Method and apparatus supporting improved wide bandwidth transmissions
KR101802128B1 (en) 2011-03-04 2017-11-27 퀄컴 인코포레이티드 Adaptive packet based modulation and coding rate selection based for wide bandwidth data transmissions

Also Published As

Publication number Publication date
WO2011005061A3 (en) 2011-04-28

Similar Documents

Publication Publication Date Title
EP2677809B1 (en) Performing handover in a LTE system
ES2623529T3 (en) Methods for aggregation of multi-point carriers of physical layer and multi-point feedback configuration
RU2577481C2 (en) Cross-scheduling for random access response
US7610018B2 (en) Channel change procedures in a wireless communications network
US9036606B2 (en) Random access method, evolved node B, and terminal equipment
US9363719B2 (en) Communications system
WO2012096502A2 (en) Secondary carrier activation/deactivation method and apparatus for mobile communication system supporting carrier aggregation
EP3567791A1 (en) Method and device for transmitting and receiving data by using multiple carriers in mobile communication system
WO2011049359A4 (en) Power headroom reporting method and device for wireless communication system
WO2013005948A2 (en) Method for terminal to control uplink timing in a wireless communication system, and device for same
WO2012018221A2 (en) Apparatus and method for supporting range expansion in a wireless network
WO2013028044A2 (en) Method of performing direct communication between terminals, method of supporting same, and apparatus for same
WO2012138143A2 (en) Method and apparatus for managing multiple timing advance groups in mobile communication system supporting carrier aggregation priority
WO2009113834A2 (en) Method and apparatus for transmitting data in dls wireless network
WO2010005180A2 (en) Method and system for managing handover in radio access networks
WO2013012156A1 (en) Method of a handover in an lte system and apparatus for same
US9282511B2 (en) Method for managing power save mode in wireless LAN system, and device for supporting same
WO2009107947A1 (en) Method of performing random access procedure in wireless communication system
WO2013036092A2 (en) Method for wireless fidelity peer-to-peer communication and device therefor
WO2010126257A2 (en) Method of performing a measurement procedure in wireless communication system
WO2012153993A2 (en) Method and apparatus for applying a time alignment timer in a wireless communication system using a carrier aggregation technique
EP2916588B1 (en) Resource allocation in target cell after handover
JP2016076970A (en) Mobile communication system
WO2013032251A2 (en) Method for supporting device-to-device communication in a cellular network, and apparatus for same
WO2010013897A2 (en) Method of performing power save multi-poll (psmp) procedure wireless local access network system and station supporting the procedure

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10797334

Country of ref document: EP

Kind code of ref document: A2

WWE Wipo information: entry into national phase

Ref document number: 13383209

Country of ref document: US

ENP Entry into the national phase in:

Ref document number: 2012519481

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase in:

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2012519481

Country of ref document: JP

122 Ep: pct application non-entry in european phase

Ref document number: 10797334

Country of ref document: EP

Kind code of ref document: A2