KR20150017642A - Synchronization Method and Apparatus for Changing Radio Configuration - Google Patents

Abstract

Provided are a method and an apparatus for synchronizing a radio configuration change. In a dual connectivity environment where one terminal transceives signals or data with at least two base stations including a master base station (MeNB) and a secondary base station (SeNB), the MeNB enables the terminal and the SeNB to change radio configuration for a specific terminal at the same time by measuring the latency between the MeNB and the SeNB and according to the measurement, using first activation time information included in an RRC reconfiguration message and/or second activation time information included in a reconfiguration applying timing indication message, thereby enabling synchronization between the terminal and the SeNB during radio configuration change or RRC reconfiguration.

Description

Technical Field [0001] The present invention relates to a wireless configuration change synchronization method and apparatus,

The present invention relates to a synchronization method and apparatus for reconfiguring a radio resource control (RRC) connection reconfiguration or a radio configuration in a wireless communication system.

In order to provide more diversified services to users and to increase the communication capacity through more efficient use of bandwidth, a UE or a User (UE) terminal in a wireless communication system such as an existing mobile communication network, for example, LTE (Long Term Evolution) Equipment can utilize two or more base stations or radio resources of transmission points such as eNBs together and can be expressed as dual connectivity.

In such a dual-connection environment, the transmission point or the base stations may be connected to each other through an ideal backhaul which does not have a time or delay required for signal transmission between them, The time required for signal transmission between the base station and the base station or delay or latency is connected to a non-ideal backhaul ranging from several ms to several tens of ms.

In the current technology, when RRC reconfiguration is performed in a dual-acknowledgment environment in which transmission points or base stations are connected by a non-ideal backhaul, RRC reconfiguration synchronization between the UE or the UE and the transmission point is not performed There is a problem that can be.

It is an object of the present invention to provide a method and apparatus for enabling synchronization in a RRC reconfiguration between a terminal and a base station in a dual-accessibility environment.

Another object of the present invention is to provide a method and apparatus for changing a radio configuration or a radio resource control reconfiguration (RRC) between a UE and a secondary eNB (SeNB) in a dual connection state such as a Bearer Split And to provide a method and apparatus for performing synchronization.

It is still another object of the present invention to provide a method and apparatus for controlling a master base station in a communication environment in which a Master eNB (MeNB) and a Secondary eNB (SeNB) Time information to at least one of the mobile station and the secondary base station and synchronizing the RRC reconfiguration or the wireless configuration change between the mobile station and the secondary base station by simultaneously changing the radio configuration using the activation time information of the terminal and the secondary base station And an apparatus.

In an embodiment of the present invention, a wireless communication system in which a terminal transmits and receives signals or data with at least two base stations including a master base station (MeNB) and a secondary base station (SeNB) A MeNB receiving a reconfiguration request message from the SeNB requesting a change of a radio configuration of the corresponding UE; a step of transmitting, by the MeNB, an RRC including a first activation time information indicating a time value at which the UE applies a radio configuration change; Generating a reconfiguration message (RRCConnectionReconfiguration) and transmitting the reconfiguration message to the UE; and receiving a reconfiguration completion message transmitted from the MeNB after applying the change of the radio configuration according to the first activation time information from the terminal Provides a synchronization method.

Another embodiment of the present invention is a wireless communication system including a master base station (MeNB) in a wireless communication system in which a terminal transmits and receives signals or data with at least two base stations including a master base station (MeNB) and a secondary base station After receiving a reconfiguration request message from the SeNB that a wireless configuration change or RRC reconfiguration is required for a specific terminal, the terminal generates an RRC reconfiguration message including first activation time information indicating when the terminal changes the wireless configuration And a reconfiguration response message processor for generating a reconfiguration response message after receiving an RRC reconfiguration completion message from the terminal and transmitting the reconfiguration response message to the SeNB, .

Yet another embodiment of the present invention is a wireless communication system in which a terminal transmits a wireless configuration change synchronization (RSM) by a terminal in a wireless communication system in which signals or data are transmitted and received with at least two base stations including a master base station (MeNB) and a secondary base station The method includes receiving, from a MeNB, an RRC reconnection message (RRConnectionReconfiguration) including first activation time information that is a time value at which a wireless configuration change should be applied in response to a SeNB request; (RRConnectionReconfigurationComplete) message indicating that the wireless configuration change has been completed, and transmitting the RRC reconfiguration completion message to the MeNB.

In another embodiment of the present invention, in a wireless communication system in which a terminal transmits and receives signals or data with at least two base stations including a master base station (MeNB) and a secondary base station (SeNB) An RRC reconfiguration message receiver for receiving, from the MeNB, an RRC reconnection message (RRConnectionReconfiguration) including first activation time information, which is a time value for applying a radio configuration change according to a SeNB request; And a RRC reconfiguration completion message processor for generating an RRC reconfiguration completion message (RRConnectionReconfigurationComplete) indicating that the wireless configuration change has been completed and transmitting the RRC reconfiguration completion message to the MeNB Change synchronization device.

According to an embodiment of the present invention, in a dual-connection environment in which a master eNB and a secondary eNB transmit signals simultaneously (i.e., simultaneously transmit and receive data) to and from one terminal, The RRC reconfiguration time is not synchronized between the secondary base station (SeNB) and the terminal by transmitting the RRC reconfiguration activation time information considering the latency between the plurality of base stations to at least one of the terminal and the counterpart base station and synchronizing the RRC reconfiguration There is an effect of preventing a problem from occurring in the data transmission / reception service.

1 shows an example of a wireless communication system in which a terminal communicates with a base station.
2 is a view for explaining the structure of an evolved packet system (EPS) bearer.
FIG. 3 illustrates a bearer segmentation state, which is an example of a dual-acknowledgment environment to which an embodiment of the present invention may be applied.
FIG. 4 shows a structure of a control plane of a dual-connection environment in which an embodiment of the present invention is applied.
5 is a flowchart illustrating an example of a process of reconfiguring RRC connection or changing a wireless configuration by SeNB in a dual-connection type communication system.
6 is a flowchart showing an overall flow of a synchronization method in a radio configuration change or RRC reconfiguration according to an embodiment of the present invention.
FIG. 7 is a signal flow diagram illustrating a radio configuration change or RRC reconfiguration method according to the first embodiment of the present invention.
FIG. 8 is a signal flow diagram illustrating a radio configuration change or RRC reconfiguration method according to a second embodiment of the present invention.
9 shows an example of the internal configuration of the MeNB among the RRC reconfiguration apparatus or the radio configuration changing apparatus according to an embodiment of the present invention.
FIG. 10 shows an example of the internal configuration of the secondary base station (SeNB) among the radio configuration changing apparatus or the RRC reconfiguration apparatus according to an embodiment of the present invention.
FIG. 11 illustrates an internal configuration diagram of a terminal apparatus for changing a wireless configuration or reconfiguring RRC between a specific SeNB according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 shows an example of a wireless communication system in which a terminal communicates with a base station.

1, a wireless communication system includes a user equipment (UE) 10 and a base station (BS) 20 that performs uplink and downlink communications with a terminal 10. [

In this specification, the terminal 10 is a comprehensive concept of a terminal in a wireless communication. The terminal 10 may be a mobile station (MS), a user terminal (UT) in GSM as well as a UE (User Equipment) in WCDMA, LTE, HSPA, , A subscriber station (SS), a wireless device, and the like.

The base station 20 may be a station communicating with the terminal 10 and may be a Node-B, an evolved Node-B, a sector, a site, a BTS (Base Transceiver System), an access point, a relay node, and a radio resource head (RRH).

The base station 20 includes various coverage areas such as a megacell, a macro cell, a micro cell, a picocell, a pam cell, a radio resource head (RRH), and a relay node communication range.

Meanwhile, a communication environment to which an embodiment of the present invention is applied is a dual connectivity environment in which a UE or a UE uses radio resources of two or more base stations or transmission points of an eNB together, .

2 is a view for explaining the structure of an Evolved Packet System (EPS) bearer.

As shown in FIG. 2, in order for a single terminal to transmit and receive user data (e.g., IP packets) to and from an external Internet network, a terminal exists between mobile communication network entities Resources must be assigned to multiple paths. The path through which the data is transmitted and received is allocated to the data transmission / reception path, which is called a bearer.

In order for data to be transmitted from the UE to the external Internet network, the UE must be able to transmit data to the Node B or the eNB through a data radio bearer on the radio, and the data is transmitted from the Node B to the serving gateway (Hereinafter also referred to as " S-GW "). Then, the corresponding data must be transmitted to the packet data network gateway (P-GW or PDN-GW) through the S5 / S8 bearer, and finally, the P- To an existing destination in an external bearer.

Likewise, in order for data to be transmitted from the external Internet network to the mobile station, the mobile station can transmit data to the mobile station via the bearers in the reverse direction.

In this case, the types of bearers and their meanings as shown in FIG. 2 will be described as follows.

The end-to-end service is an end-to-end service in which an end-to-end service is established between an EPS bearer as a path between a terminal and a P-GW and an external bearer External Bearer) is required. In this case, the external bearer means a bearer between the P-GW and the Internet network.

The EPS bearer is a delivery path established between the UE and the P-GW in order to transmit IP traffic with a specific QoS (Quality of Service), and each EPS bearer can be set with QoS parameters indicating the characteristics of a delivery path. The EPS bearer uniquely represents the concatenation of one E-RAB and one S5 / S8 bearer.

At this time, the S5 / S8 bearer is a bearer in the S5 / S8 interface, and both S5 and S8 are bearers existing in the interface between the S-GW and the P-GW. The S5 interface belongs to the same operator as the S-GW and the P-GW belongs to the same operator. The S-GW belongs to the operator who has roamed the S-GW (ie Visited PLMN) , Home PLMN). In addition, one E-RAB uniquely represents the sum of the S1 bearer and the corresponding data radio bearer (the radio bearer of FIG. 2), and when one E-RAB exists, To-one mapping between the two.

Meanwhile, a radio bearer or a data radio bearer is distinguished from a signaling radio bearer as a bearer or path through which user data is transmitted. A Signaling Radio Bearer is a path through which RRC and NAS control messages are transmitted. When there is one data radio bearer, there is a one-to-one mapping between the corresponding data radio bearer, the E-RAB, and the EPS bearer.

On the other hand, dual accessibility means that one terminal uses radio resources of at least two base stations (eNB) together. The base stations may be connected to an ideal backhaul that requires little time between transmissions between the base stations and may be connected to a non-ideal backhaul of several ms to several tens of milliseconds , And an exemplary embodiment of the present invention assumes a non-ideal backhaul connection.

In this dual connectivity, two or more base stations to which one terminal transmits and receives data may include a master eNB (also referred to as a "MeNB") and a secondary eNB (referred to as a "SeNB" hereinafter) , But is not limited thereto, and is not particularly limited to MeNB and SeNB.

Among them, the master eNB or the MeNB is an end-station having at least an S1-MME (Mobility Management Entity) interface in a dual concatenation environment, and serves as a mobility anchor for a core network (CN) Means a base station capable of directly performing configuration and reconfiguration of an RRC with a terminal.

The secondary eNB or the SeNB is a base station that provides additional radio resources to the UE in a dual concatenation environment. The secondary eNB or the SeNB refers to a base station other than the MeNB, and the SeNB refers to a radio configuration such as an RRC (re- Can not be changed. In other words, the SeNB means that the RRC layer for the UE receiving the service may not exist, so that it can not generate the RRC message for the change directly to the radio configuration.

On the other hand, the dual-connection environment can be divided into a case where there is a bearer split and a case where there is no bearer split, and a case where there is a bearer split is shown in FIG.

FIG. 3 illustrates a bearer segmentation state, which is an example of a dual-acknowledgment environment to which an embodiment of the present invention may be applied.

Bearer Split means that data bearer service is performed through two or more different base stations of one EPS bearer. That is, as shown in FIG. 3, one EPS bearer # 2 is connected to a master eNB (MeNB) And a data transmission / reception service through the secondary eNB (SeNB).

However, bearer splitting is an example of a dual-join environment in which an embodiment of the present invention is applied, and an embodiment of the present invention is not limited to the case of such bearer splitting.

FIG. 4 shows a structure of a control plane of a dual-connection environment in which an embodiment of the present invention is applied.

As shown in FIG. 4, in the dual-access communication system in which the embodiment of the present invention is applied, the MeNB having the RRC layer and the UE are connected through the Uu interface, and the SeNB without the RRC layer is also connected to the UE through the Uu interface . Also, MeNB and SeNB are connected to each other via the Xn interface.

As described above, in the dual-connection type communication system to which the embodiment of the present invention is applied, the RRC layer exists only in the MeNB. Accordingly, the SeNB may directly generate an RRC message related to the UE and not transmit the RRC message to the UE. However, it is possible to receive the RRC message generated by the MeNB from the MeNB and transmit it to the UE.

5 is a flowchart illustrating an example of a process of reconfiguring RRC connection or changing a wireless configuration by SeNB in a dual-connection type communication system.

As described above, since the SeNB does not have the RRC layer in the dual-accessibility environment in which the embodiment of the present invention is applied, it can not directly signal the RRC reconfiguration between the specific terminals to the UE.

Therefore, the SeNB, which determines that the RRC reconfiguration is necessary, generates a terminal information request message including an intention to change the wireless configuration and transmits the terminal information request message to the MeNB (S510). The terminal information request message is used to change a radio configuration A message requesting the information necessary for performing the operation, in particular, the capability information of the terminal.

Upon receiving the terminal information request message, the MeNB extracts the terminal information such as the terminal capability information to be considered in determining the change of the wireless configuration, and transmits the terminal information to the SeNB (S520)

Next, the SeNB generates a reconfiguration request message requesting a change in the radio configuration of the corresponding terminal, that is, an RRC reconfiguration (RRC reconfiguration) or a radio configuration change, and transmits the reconfiguration request message to the MeNB (S530) An RRC reconnection message (RRConnectionReconfiguration) for instructing a wireless configuration change is generated and transmitted to the corresponding terminal (S540)

The UE applies the change of the radio configuration immediately or as soon as possible after receiving the RRC reconnection message (RRConnectionReconfiguration). That is, the RRC configuration is changed according to the RRC configuration parameter requested to be changed. The terminal generates an RRC reconfiguration completion message (RRConnectionReconfigurationComplete) and transmits it to the MeNB as soon as the change application is completed (S550)

Upon receiving the RRC reconfiguration completion message (RRCConnectionReconfigurationComplete), the MeNB generates an RRC reconfiguration response message (Reconfiguration response message) indicating that the change of the radio configuration of the UE is completed, and transmits the RRC reconfiguration response message to the SeNB (S560) One SeNB confirms that the wireless configuration change of the corresponding terminal is applied, and changes and provides the service to the terminal in accordance with the changed wireless configuration. That is, after changing the RRC configuration parameters, the RRC connection with the corresponding terminal is performed and the signal or data is transmitted and received.

If the SeNB generates the RRC reconfiguration request message and transmits the RRC reconfiguration request message to the MeNB (S530), the wireless configuration for the corresponding UE is changed. In this case, the interface between the SeNB and the MeNB Since it is connected with an ideal backhaul, there may be a latency of about 15 to 60 ms, so that a certain time may be delayed between the MeNB and the terminal. Accordingly, the SeNB has already applied the change of the wireless configuration, but the UE receives the RRC reconfiguration message (RRCConnectionReconfiguration) from the MeNB in step S540 and changes the wireless configuration of the UE accordingly, . As a result of the asynchronous wireless configuration between the SeNB and the UE, the data transmission / reception service may not be properly performed.

In order to solve this problem, the SeNB may change the radio configuration immediately after receiving the RRC reconfiguration response message (Reconfiguration Response message) in step S560. In this case, in step S550, the RRC reconfiguration completion message (RRCConnectionReconfigurationComplete) , It means that the mobile station has already applied the radio configuration change. In the case of SeNB, the changed radio configuration is required only after the time spent between the terminal and the MeNB and the time required between the MeNB and SeNB (about 15 ~ 60ms) The UE and the SeNB are in a different radio configuration state for a predetermined period of time. That is, the wireless configuration of the UE and the SeNB is asynchronous for a certain period of time, and thus, there may be a problem in data transmission / reception service during this time.

In order to overcome this disadvantage, in an embodiment of the present invention, in a wireless communication system in which one terminal is connected to a master base station (MeNB) and a secondary base station (SeNB), the MeNB or the SeNB is connected to the MeNB and the SeNB, And after the MeNB receives the RRC reconfiguration request message requesting the wireless configuration change of the corresponding terminal from the SeNB, the first terminal activates the first activation time information (1 ^st Activation Time (RRConnectionReconfiguration) including the RRC connection information to the UE, and the UE may include a configuration in which the UE applies the change of the radio configuration according to the first activation time information.

In addition, the MeNB generates an RRC reconnection message (RRConnectionReconfiguration) including the first activation time information and transmits the RRC reconfiguration message to the UE. In addition, the SeNB transmits the RRC reconnection message 2 Activation Time Indication message to the SeNB, and the SeNB may apply the change of the radio configuration to the UE according to the second activation time information.

Hereinafter, the first activation time information provided to the terminal by the MeNB and the second activation time information provided by the SeNB will be separately described, but the first and second activation time information may be the same one.

As a result, the SeNB and the UE can apply the newly modified wireless configuration from the same point in time, thereby solving the problem caused by the asynchronous phenomenon of the wireless configuration.

6 is a flowchart showing an overall flow of a synchronization method in a radio configuration change or RRC reconfiguration according to an embodiment of the present invention.

A MeNB or SeNB measuring latency or delay between the MeNB and the SeNB in a wireless communication system in which a terminal is connected to a MeNB and a SeNB; a step (S610) of determining whether the MeNB or the SeNB performs a reconfiguration A step (S620) of receiving a request message, and a step of generating a RRC reconnection message (RRConnectionReconfiguration) including the first activation time information indicating a time value at which the corresponding terminal applies the radio configuration change (S620) (S630), and receiving a reconfiguration completion message to be transmitted after the terminal applies the change of the radio configuration according to the first activation time information (S640).

In addition, in addition to the MeNB generating an RRC reconnection message (RRConnectionReconfiguration) including the first activation time information and transmitting the RRC reconnection message to the UE, the MeNB may transmit the second activation time information A step S650 of generating and sending a reconfiguration application time indicating message including the activation time information to the SeNB, and a step S660 of applying the wireless configuration change at the same time as the terminal using the second activation time information May be further included.

The first activation time information included in the RRC reconnection message (RRConnectionReconfiguration) and the second activation time information included in the reconfiguration application time indication message may be values indicating the same time. Alternatively, each activation time information may include a relative value, but an absolute time point may represent the same time point. That is, the SeNB and the UE can apply the newly changed wireless configuration from the same point of view only when the first and second activation time information are the same, and the problems caused by applying different wireless configurations The problem caused by the asynchronous phenomenon of the wireless configuration can be prevented.

FIG. 7 is a signal flow diagram illustrating a radio configuration change or RRC reconfiguration method according to the first embodiment of the present invention.

First, in order to know the latency value between the SeNB and the MeNB when the radio configuration of the specific terminal to which the service is to be changed needs to be changed, that is, when the RRC reconfiguration is required, SeNB sends a latency measurement request Message (S710)

At this time, the latency measurement request message may include a first time stamp (Time Stamp) information, which is a time value at which the SeNB sends a latency measurement request message to the MeNB, and the MeNB, which has received the latency measurement request message, And compares the received time with the first time stamp information value to calculate a latency value from the SeNB to the MeNB.

The MeNB, which has calculated the latency value, generates a latency measurement response message and transmits the latency measurement response message to the SeNB (S720). In the latency measurement response message, the SeNB-to-MeNB Latency Information and a second time stamp information that is a time value at which the MeNB transmits the latency measurement response message to the SeNB. However, the present invention is not limited thereto.

The SeNB receiving the latency measurement response system including such information can calculate the time, i.e., latency, required for the message to be transmitted from the MeNB to the SeNB using the time value of the message and the second time stamp information, It is also possible to determine the time required for a message to be transmitted from SeNB to MeNB using SeNB-to-MeNB Latency Information included in the latency measurement response system. That is, both the latency from MeNB to SeNB and the latency from SeNB to MeNB can be calculated.

Of course, the latency measurement between the MeNB and the SeNB does not necessarily need to be performed by the SeNB transmitting the measurement request message at the time of inter-arrival (S710) and the MeNB returning the measurement response message thereto (S720) The latency may be measured in a different manner as in the second embodiment to be described.

That is, the latency measurement method according to S710 and S720 is merely one example, and another latency measurement method may be used.

After the SeNB calculates the latency between itself and the MeNB in this manner, the SeNB generates a reconfiguration request message to change the radio configuration for a specific terminal and transmits the reconfiguration request message to the MeNB (S730). The reconfiguration request The message includes a change in the radio configuration from when the UE receives the RRC reconnection message (RRConnectionReconfiguration) from the MeNB, in addition to the UE identity of the UE as the object of the radio configuration change and the radio configuration parameter information to be changed The first activation time information may be a time value for the first activation time.

The first activation time information may be an absolute time value or may be a relative time value or a time difference value from when the terminal applies the change in the radio configuration since receiving the RRC reconnection message (RRConnectionReconfiguration) from the MeNB. In the case of an absolute time value, for example, it may be in the form of [System Frame Number (SFN) + Subframe Number].

In addition, the above-described wireless configuration parameter information to be changed may include a parameter related to a measurement method, a parameter for controlling mobility, a dedicated radio configuration parameter, a security-related parameter, and the like But the present invention is not limited thereto.

On the other hand, since the SeNB already knows the first activation time information, it is possible to know at what point the terminal applies the change of the wireless configuration, and therefore the wireless terminal can apply the wireless configuration change to the terminal at the same time . This allows synchronization of the wireless configuration change between the SeNB and the terminal.

Next, the MeNB that receives the reconfiguration request message including the first activation time information from the SeNB includes the information (the first activation time information, the radio configuration parameter information to be changed, etc.) included in the reconfiguration request message And transmits the generated RRC reconnection message (RRConnectionReconfiguration) to the corresponding terminal (S740)

On the other hand, the terminal receiving the RRC reconnection message (RRConnectionReconfiguration) including the first activation time information does not directly apply the change of the corresponding radio configuration parameter, but confirms the first activation time information and designates it by the first activation time information The RRC reconfiguration completion message RRConnectionReconfigurationComplete is generated and transmitted to the MeNB immediately after the application of the change of the wireless configuration parameters is completed (S750)

After receiving the RRC reconnection completion message (RRConnectionReconfigurationComplete), the MeNB generates a reconfiguration response message (reconfiguration response message) indicating that the change of the radio configuration of the UE has been completed and transmits the reconfiguration response message to the SeNB (S760) SeNB confirms that the wireless configuration change of the corresponding terminal is applied, and changes and provides the service to the terminal in accordance with the changed wireless configuration. However, the point of time at which the SeNB applies the changed radio configuration may not necessarily be after the step S760 and may be before the step S760 in which the reconfiguration response message is received from the MeNB, and the point at which the radio change is applied is the time indicated by the first activation time information .

As described above, according to the first embodiment of the present invention, when the wireless configuration change between the SeNB and the specific terminal is required by measuring the latency between the SeNB and the MeNB, the first activation time information The terminal applies the change to the wireless configuration corresponding to the time specified by the first activation time information and the SeNB also changes the wireless configuration for the terminal at the same time, Synchronization of the RRC reconfiguration becomes possible.

FIG. 8 is a signal flow diagram illustrating a radio configuration change or RRC reconfiguration method according to a second embodiment of the present invention.

The second embodiment of FIG. 8 does not limit the latency measurement between the SeNB and the MeNB in a particular manner, and that the MeNB does not transmit an RRC reconnection message (RRConnectionReconfiguration) including the first activation time information to the terminal , The SeNB generates a reconfiguration application time indicating message including second activation time information, which is information on a time when the changed wireless configuration is to be applied to the UE, and transmits the message to the SeNB. .

Hereinafter, with reference to FIG. 8, a radio configuration change or RRC reconfiguration method according to a second embodiment of the present invention will be described.

First, at least one of MeNB and SeNB measures the latency between base stations, which is the time required to transmit signals or data between itself and the other party (S810)

Such a method for measuring inter-base station latency may be standardized, but may include various methods according to a specific technology implementation method, and the present invention is not limited to a specific latency measurement method.

If the inter-base station latency is determined in step S810, the information about the inter-base station latency may be stored / managed in the MeNB and / or the SeNB.

Next, the SeNB generates a reconfiguration request message requesting to change the radio configuration for a specific terminal and transmits the reconfiguration request message to the MeNB (S820). In the reconfiguration request message, the identification information of the terminal (UE Identity), a radio configuration parameter information to be changed, and the like. The above-mentioned radio configuration parameter information to be changed includes parameters related to a measurement method, parameters for controlling mobility, (Dedicated Radio Configuration Parameter), security related parameters, and the like, but is not limited thereto.

Next, the MeNB receiving the reconfiguration request message from the SeNB generates an RRC reconnection message (RRConnectionReconfiguration) and transmits it to the corresponding terminal (S830). The RRC reconfiguration message may include first activation time information, which is a time value for when to apply the change of the radio configuration since the UE receives the RRC reconnection message (RRConnectionReconfiguration) from the MeNB.

The first activation time information may be an absolute time value or may be a relative time value or a time difference value from when the terminal applies the change in the radio configuration since receiving the RRC reconnection message (RRConnectionReconfiguration) from the MeNB. In the case of an absolute time value, for example, it may be in the form of [System Frame Number (SFN) + Subframe Number].

In addition to the first embodiment, in the second embodiment of the present invention, in addition to step S830 in which the MeNB transmits an RRC reconnection message (RRConnectionReconfiguration) including the first activation time information to the terminal, And generating a reconfiguration application time indicating message including second activation time information, which is information on a time when the changed radio configuration is to be applied to the UE, to the SeNB (S840).

In step S830, the MeNB transmits an RRC reconfiguration message (RRConnectionReconfiguration) to the UE. In step S840, the MeNB generates a reconfiguration application time indication message and transmits the reconfiguration application indication message to the SeNB. However, the MeNB may be performed sequentially.

The second activation time information may be an absolute time value or a relative time value or a time difference value as a time value indicating when the SeNB receiving the reconfiguration application time indicating message applies radio configuration change for the corresponding UE. In the case of an absolute time value, for example, it may be in the form of [System Frame Number (SFN) + Subframe Number].

In addition, according to the second embodiment of the present invention, since the terminal and the SeNB must simultaneously apply the radio configuration change to the other party, when the time values indicated by the first activation time information and the second activation time information are the same And the first and second activation time information may be divided information or may be the same type of information as the case may be.

As described above, according to the first activation time information included in the RRC reconnection message (RRConnectionReconfiguration), the SeNB transmits a radio configuration between the UE and the SeenB at the same time point based on the second activation time information included in the reconfiguration time indication message A change of the wireless configuration change between the SeNB and the terminal can be performed.

Next, the UE receiving the RRC reconnection message (RRConnectionReconfiguration) including the first activation time information does not directly apply the change of the corresponding radio configuration parameter, but confirms the first activation time information and then, based on the first activation time information The RRC reconfiguration completion message (RRConnectionReconfigurationComplete) is generated and transmitted to the MeNB immediately after the application of the change of the wireless configuration parameters is completed (S850)

After receiving the RRConnectionReconfigurationComplete message, the MeNB generates an RRC reconfiguration response message (Reconfiguration Response message) indicating that the change of the radio configuration of the UE has been completed, and transmits the RRC reconfiguration response message to the SeNB. (S860) The received SeNB confirms that the wireless configuration change of the corresponding terminal is applied, and changes and provides the service to the terminal in accordance with the changed wireless configuration. However, the point of time at which the SeNB applies the changed radio configuration is not necessarily after the step S860 and it may be before the step S860 in which the reconfiguration response message is received from the MeNB. The point of applying the radio change may be the first activation time information or the second activation time It is the time indicated by the time information.

As described above, according to the first embodiment of the present invention, the latency between the SeNB and the MeNB is measured, and when the wireless configuration change between the SeNB and the specific terminal is required, the terminal transmits the first activation information included in the RRC reconnection message (RRConnectionReconfiguration) According to the time information, the SeNB applies the wireless configuration change between the terminal and the SeenB at the same time according to the second activation time information included in the reconfiguration time indication message, so that synchronization of the wireless configuration change is performed between the SeNB and the terminal .

9 shows an example of the internal configuration of the MeNB among the RRC reconfiguration apparatus or the radio configuration changing apparatus according to an embodiment of the present invention.

MeNB basically includes an RRC reconfiguration message processing unit 910 and a reconfiguration response message processing unit 920. The MeNB further includes a latency measurement unit 930 for measuring the latency between the SeNB and itself, And a reconfiguration application time point message processing unit 940.

The internal components of this MeNB are described in more detail below.

After the RRC reconfiguration message processing unit 910 receives a reconfiguration request message indicating that a wireless configuration change or RRC reconfiguration for a specific terminal is required from the SeNB, the RRC reconfiguration message processing unit 910 performs RRC reconfiguration And transmits the generated message to the terminal.

The first activation time information may be an absolute time value or it may be a relative time value or a time difference value from when the terminal applies the change in the radio configuration since receiving the RRConnectionReconfiguration message from the MeNB. In the case of an absolute time value, for example, it may be a format such as [System Frame Number (SFN) + subframe number], but it is not limited thereto.

The RRC reconfiguration message may further include, in addition to the first activation time information, the radio configuration parameter information to which the mobile station should apply the change. The radio configuration parameter information to be changed includes parameters related to the measurement method, A parameter for controlling mobility, a dedicated radio configuration parameter, a security-related parameter, and the like, but is not limited thereto.

In addition, the reconfiguration response message processor 920 receives the RRC reconfiguration completion message (RRConnectionReconfigurationComplete) from the UE, generates a reconfiguration response message, and transmits the message to the SeNB.

The latency measuring unit 930 measures a latency or a time required for signal transmission between the SeNB and the MeNB. The latency measuring unit 930 measures a first time stamp (i.e., a time value for sending a latency measurement request message to the MeNB) After receiving the latency measurement request message including the time stamp information, the latency value from the SeNB to the MeNB can be calculated by comparing the time of receiving the message with the first time stamp information value. However, But the present invention is not limited thereto. This latency measuring unit can calculate the latency from MeNB to SeNB as opposed to the latency from SeNB to MeNB.

Also, after receiving the reconfiguration request message from the SeNB, the reconfiguration application time point message processor 940 generates a reconfiguration application time indicating message indicating the point at which the SeNB performs the radio configuration change or the RRC reconfiguration for the corresponding terminal, and transmits the message to the SeNB And the reconfiguration application time point indication message may include second activation time information, which is information on when the SeNB applies the changed wireless configuration to the corresponding terminal.

The second activation time information may be an absolute time value or a relative time value or a time difference value as a time value indicating when the SeNB receiving the reconfiguration application time indicating message applies the wireless configuration change for the corresponding terminal. In the case of the absolute time value, for example, it may be a format such as [System Frame Number (SFN) + subframe number], but the present invention is not limited thereto, and may be the same as the time point specified by the first activation time information It is preferable to indicate the time point.

FIG. 10 shows an example of the internal configuration of the secondary base station (SeNB) among the radio configuration changing apparatus or the RRC reconfiguration apparatus according to an embodiment of the present invention.

Unlike MeNB, which can directly perform a radio configuration change such as RRC reconfiguration for a specific terminal, the SeNB according to an embodiment of the present invention does not have an RRC layer, It means a base station that can not be performed.

10, the SeNB according to an embodiment of the present invention includes a reconfiguration request message processor 1010, a reconfiguration response message receiver 1020 for receiving a reconfiguration response message from the MeNB, A latency measurement unit 1040 for measuring a latency between the MeNB and itself, and a wireless configuration change unit 1030 for applying a wireless configuration change or RRC reconfiguration to the terminal And a reconfiguration application time message reception unit 1050 for receiving a reconfiguration application time indication message from MeNB.

The following sections describe these SeNB internal components in more detail.

The reconfiguration request message processor 1010 generates a reconfiguration request message and transmits the reconfiguration request message to the MeNB when a radio configuration change or RRC reconfiguration is required for a specific terminal.

Meanwhile, the reconfiguration request message includes the UE identity (UE Identity) that is the object of the radio configuration change and the radio configuration parameter information to be changed. In addition, after the UE receives the RRC reconfiguration message (RRConnectionReconfiguration) from the MeNB The first activation time information, which is a time value for when to apply the change of the wireless configuration, and the detailed description of the wireless configuration parameter information, the first activation time information, and the like to be changed is omitted in order to avoid duplication.

The reconfiguration response message receiving unit 1020 receives a reconfiguration response message from the MeNB indicating that the UE has applied the change to the radio configuration based on the first activation time information included in the RRC reconnection message (RRConnectionReconfiguration) And performs a receiving function.

That is, the MeNB generates and transmits a reconfiguration response message to notify the SeNB of the fact that the MeNB receives the RRC reconfiguration completion message (RRConnectionReconfigurationComplete) from the UE.

The wireless configuration changing unit 1030 performs a function of changing the wireless configuration related to the corresponding terminal, and applying the wireless configuration change means resetting the wireless configuration parameters and the like requested by the SeNB appropriately and resetting do.

According to the first embodiment of the present invention, since the SeNB itself has already generated the first activation time information and transmitted it to the terminal via the MeNB, the first activation The wireless configuration change unit 1030 applies the wireless configuration change to the corresponding terminal at the same time when the terminal changes the wireless configuration according to the first activation time information.

In addition, according to the second embodiment of the present invention, the radio configuration change unit 1020 changes the radio configuration change or RRC reconfiguration for the corresponding terminal by the reconfiguration application time message receiving unit 1050, which will be described below, After receiving a reconfiguration application time indicating message including the 2 activation time information from the MeNB, the mobile communication terminal applies a wireless configuration change to the corresponding terminal at a specific time indicated by the second activation time information.

In addition, the reconfiguration application time point message receiving unit 1050 receives a reconfiguration application time point indicating message indicating a time point at which to perform a radio configuration change or RRC reconfiguration for the corresponding terminal from the MeNB, And second activation time information, which is information on the time when the changed wireless configuration is to be applied to the corresponding terminal.

Details of the first activation time information, the second activation time information and the like are omitted in order to avoid duplication.

FIG. 11 illustrates an internal configuration diagram of a terminal apparatus for changing a wireless configuration or reconfiguring RRC between a specific SeNB according to an embodiment of the present invention.

As shown in FIG. 11, a terminal according to an embodiment of the present invention transmits and receives signals or data to at least two base stations including a MeNB and a SeNB, and includes a RRC reconfiguration message receiver 1110, A reconfiguration processing unit 1120 that performs configuration parameter changes, and an RRC reconfiguration completion message processing unit 1130 that generates an RRC reconfiguration completion message (RRConnectionReconfigurationComplete) and transmits the message to the MeNB.

Hereinafter, with reference to FIG. 11, internal components of such a terminal will be described in more detail.

The RRC reconfiguration message receiving unit 1110 receives an RRC reconfiguration message (RRConnectionReconfiguration) from the MeNB including the first activation time information, which is a time value for applying the radio configuration change.

In addition, the reconfiguration processing unit 1120 performs an actual change of a radio configuration parameter that needs to be changed at a time designated by the first activation time information included in the RRC reconfiguration message.

 The RRC reconfiguration completion message processor 1130 generates a RRC reconfiguration completion message (RRConnectionReconfigurationComplete) indicating that the wireless configuration in the UE has changed at the time specified by the first activation time information or that the RRC reconfiguration has been completed, and transmits the message to the MeNB .

On the other hand, when the SeNB changes the wireless configuration based on the first activation time information included in the RRC reconfiguration message and / or the second activation time information included in the reconfiguration application time indicating message, The synchronization between the terminal and the SeNB can be achieved in the case of the radio configuration change or the RRC reconfiguration.

As described above, according to an embodiment of the present invention, a single terminal transmits a dual connectivity having at least two base stations including a master base station (MeNB) and a secondary base station (SeNB) Environment, the latency of the MeNB and the SeNB is measured, and the second activation time information included in the first activation time information and / or the reconfiguration application time indicating message included in the RRC reconfiguration message accordingly is used, It is possible to change the radio configuration for a specific terminal at the same time, thereby enabling synchronization between the terminal and the SeNB in a radio configuration change or RRC reconfiguration.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (14)

A method for synchronizing a wireless configuration change by a master base station in a wireless communication system in which a terminal transmits and receives signals or data with at least two or more base stations including a master base station (MeNB) and a secondary base station (SeNB)
Receiving, by the MeNB, a reconfiguration request message requesting a change in the radio configuration of the UE from the SeNB;
Generating, by the MeNB, an RRC reconfiguration message (RRConnectionReconfiguration) including first activation time information indicating a time value at which the UE applies the radio configuration change, and transmitting the RRC reconfiguration message to the UE;
Receiving a reconfiguration completion message from the terminal after the MeNB applies a change in the radio configuration according to the first activation time information;
Wherein the wireless configuration change synchronization method comprises: The method according to claim 1,
Wherein the SeNB changes the wireless configuration associated with the corresponding terminal at the same time as the terminal applies the wireless configuration change according to the first activation time information. The method according to claim 1,
Wherein said MeNB or SeNB further measures latency or delay between MeNB and SeNB. The method according to claim 1,
The MeNB further comprises a step of generating a reconfiguration application time indicating message including second activation time information, which is information on a time when the SeNB applies the changed radio configuration to the UE, and transmitting the generated reconfiguration application time indicating message to the SeNB How to synchronize wireless configuration changes. 5. The method of claim 4,
Wherein the first activation time information included in the RRC reconnection message (RRConnectionReconfiguration) and the second activation time information included in the reconfiguration application time indicating message are values indicating the same time point. The method according to claim 1,
Wherein the first activation time information is an absolute time value and has a format of [System Frame Number (SFN) + specific subframe number]. The method according to claim 1,
Wherein the reconfiguration request message includes at least one of a UE Identity that is an object of a radio configuration change, a radio configuration parameter information to be changed, and the first activation time information . The method of claim 3,
Wherein measuring the latency or delay comprises:
Receiving a latency measurement request message from the SeNB;
Comparing the first time stamp information included in the latency measurement request message with the reception time of the latency measurement request message to calculate a latency from the SeNB to the MeNB;
Generating a latency measurement response message including latency information from the SeNB to the MeNB and transmitting the latency measurement response message to the SeNB. 1. A wireless configuration change synchronization apparatus, which is a master base station (MeNB) in a wireless communication system in which one terminal transmits and receives signals or data to at least two or more base stations including a master base station (MeNB) and a secondary base station (SeNB)
After receiving a reconfiguration request message from the SeNB that requires a radio configuration change or RRC reconfiguration for a specific UE, the UE generates an RRC reconfiguration message including first activation time information indicating a time point at which the UE changes the radio configuration, An RRC reconfiguration message processor;
A reconfiguration response message processor for generating a reconfiguration response message after receiving the RRC reconfiguration completion message (RRConnectionReconfigurationComplete) from the terminal and transmitting the reconfiguration response message to the SeNB;
Wherein the wireless configuration change synchronization device comprises: 10. The method of claim 9,
And a reconfiguration application time point message processing unit for generating a reconfiguration application time indicating message indicating a time point at which the SeNB performs a radio configuration change or RRC reconfiguration for the UE after receiving the reconfiguration request message from the SeNB and transmitting the reconfiguration application time point message to the SeNB The wireless configuration change synchronization apparatus comprising: 11. The method of claim 10,
Wherein the reconfiguration application time indicating message includes second activation time information that is information on a time when the SeNB applies the changed wireless configuration to the corresponding terminal. A method for synchronizing a wireless configuration change by a terminal in a wireless communication system in which a terminal transmits and receives signals or data with at least two base stations including a master base station (MeNB) and a secondary base station (SeNB)
Receiving from the MeNB an RRC reconnection message (RRConnectionReconfiguration) including first activation time information, which is a time value at which the wireless configuration change should be applied according to the request of the SeNB;
Applying a change of a wireless configuration corresponding to a time point designated by the first activation time information;
Generating an RRC reconfiguration completion message (RRConnectionReconfigurationComplete) indicating that the wireless configuration change has been completed and transmitting the message to the MeNB;
Wherein the wireless configuration change synchronization method comprises: 13. The method of claim 12,
Wherein the time when the change of the wireless configuration is applied is the same time as the time when the SeNB applies the wireless configuration change. There is provided a radio configuration change synchronization apparatus which is the terminal in a wireless communication system in which one terminal transmits and receives signals or data to at least two base stations including a master base station (MeNB) and a secondary base station (SeNB)
An RRC reconfiguration message receiver for receiving an RRC reconfiguration message (RRConnectionReconfiguration) from the MeNB, the RRC reconfiguration message including first activation time information that is a time value for applying a radio configuration change according to a request of the SeNB;
A reconfiguration processing unit for applying a change in a radio configuration corresponding to a time point designated by the first activation time information;
An RRC reconfiguration completion message processor for generating an RRC reconfiguration completion message (RRConnectionReconfigurationComplete) indicating that the wireless configuration change has been completed and transmitting the message to the MeNB;
Wherein the wireless configuration change synchronization device comprises:

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