JP7318751B2 - Target base station and method performed by target base station - Google Patents

Description

The present invention relates to devices associated with radio access networks.

In addition to the currently used frequency bands of hundreds of megahertz and several gigahertz bands, even higher frequency bands of tens of gigahertz bands can be used to achieve exponential capacity expansion of mobile networks. Especially in the fifth generation (5G), in order to take advantage of such bands, it is being considered to use a large number of antennas to form sharp directional beams to transmit signals to users.

In higher frequency bands, all downlink signals/downlink channels, including not only system information and paging information, but also common pilot signals or reference signals, etc., can use beamforming to compensate for large propagation losses. It is also conceivable that it is transmitted. Similarly, for the uplink, all uplink signals/uplink channels may be received using beamforming for propagation loss compensation.

For example, Patent Literature 1 discloses a technique of including a downlink beam ID and an uplink beam ID in a handover request message transmitted from a handover source base station of a terminal device to a target base station. Furthermore, according to Patent Document 1, the downlink beam ID is used to indicate the downlink beam for transmitting data to the terminal device after handover, and the uplink beam ID is used to indicate the data from the terminal device after handover. Used to direct the uplink beam for receiving data. This makes it possible to omit the operation for selecting a beam during handover, thereby reducing handover delay.

Japanese translation of PCT publication No. 2014-531852

However, with the technology disclosed in Patent Document 1 and the like, the target base station of the handover destination takes time to allocate a data channel (Data CH) considering the terminal device immediately after the handover. For this reason, there is a problem that the throughput of the terminal device is difficult to increase immediately after the handover.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device capable of rapidly increasing the throughput of a terminal device immediately after handover.

A base station of the present invention comprises an obtaining unit for obtaining a response message to a handover message from a handover source base station of a terminal device, the response message including uplink resource information related to measurements for the terminal device;
and a first communication processing unit that transmits the response message to the handover message to the source base station.

According to the present invention, it is possible to quickly increase the throughput of a terminal device immediately after handover. It should be noted that other effects may be achieved by the present invention instead of or in addition to the above effects.

FIG. 1 is an explanatory diagram showing an example of a schematic configuration of a system 1 according to the first embodiment. FIG. 2 is a block diagram showing an example of a schematic configuration of the base station 100 of the first embodiment. FIG. 3 is a block diagram showing an example of a schematic configuration of the base station 200 of the first embodiment. FIG. 4 is a block diagram showing an example of a schematic configuration of the terminal device 300 of the first embodiment. FIG. 5 is an explanatory diagram for explaining an example of a plurality of beams through which reference signals are transmitted. FIG. 6 is an explanatory diagram for explaining an example of the measurement report of the terminal device 300. As shown in FIG. FIG. 7 is a sequence diagram for explaining an example of a schematic flow of processing according to the first embodiment. FIG. 8 is a sequence diagram for explaining an example of a schematic flow of processing according to a comparative example of the first embodiment. FIG. 9 is an explanatory diagram showing an example of a schematic configuration of the system 2 according to the second embodiment. FIG. 10 is a block diagram showing an example of a schematic configuration of the base station 500 of the second embodiment. FIG. 11 is a block diagram showing an example of a schematic configuration of the base station 600 of the second embodiment. FIG. 12 is a block diagram showing an example of a schematic configuration of the terminal device 700 of the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the present specification and drawings, elements that can be described in the same manner can be omitted from redundant description by assigning the same reference numerals.

The description is given in the following order.
1. Overview of Embodiments of the Invention 2 . First Embodiment 2.1. System configuration 2.2. Configuration of base station 100 2.3. Configuration of base station 200 2.4. Configuration of Terminal Device 300 2.5. Technical features 3. Second embodiment 3.1. System configuration 3.2. Configuration of base station 500 3.3. Configuration of base station 600 3.4. Configuration of Terminal Device 700 3.5. Technical features 4. Other embodiment

<<1. Overview of Embodiments of the Present Invention>>
First, an outline of an embodiment of the present invention will be described.

(1) Technical Issues In addition to the currently used frequency bands of hundreds of megahertz and several gigahertz bands, higher frequency bands of dozens of gigahertz bands will be used in order to achieve dramatic expansion of mobile network capacity. can be Especially in the fifth generation (5G), in order to take advantage of such bands, it is being considered to use a large number of antennas to form sharp directional beams to transmit signals to users.

In higher frequency bands, all downlink signals/downlink channels, including not only system information and paging information, but also common pilot signals or reference signals, etc., can use beamforming to compensate for large propagation losses. It is also conceivable that it is transmitted. Similarly, for the uplink, all uplink signals/uplink channels may be received using beamforming for propagation loss compensation.

For example, in a patent document (Japanese Patent Publication No. 2014-531852), a downlink beam ID and an uplink beam ID are included in a handover request message transmitted from a handover source base station of a terminal device to a target base station. Techniques are disclosed. Furthermore, according to the above patent document, the downlink beam ID is used to indicate the downlink beam for transmitting data to the terminal device after handover, and the uplink beam ID is used to indicate the data from the terminal device after handover. Used to direct the uplink beam for receiving data. This makes it possible to omit the operation for selecting a beam during handover, thereby reducing handover delay.

However, with the technology disclosed in the above patent document, the target base station to which handover is to take time to allocate a data channel (Data CH) considering the terminal device immediately after handover. For this reason, there is a problem that the throughput of the terminal device is difficult to increase immediately after the handover.

Therefore, it is desirable to be able to quickly increase the throughput of the terminal device immediately after handover.

(2) Technical features In an embodiment of the present invention, for example, a handover target base station is a response message to a handover message from a handover source base station of a terminal device, which is an update message related to measurements for the terminal device. Obtaining a response message including link resource information, and transmitting the response message to the handover message to the source base station.

Also, for example, the source base station receives from the target base station the response message including the information of the uplink resources related to the measurements for the terminal, and A handover command message is sent to the terminal device including information corresponding to the information of the uplink resource.

Further, for example, the terminal receives from the source base station a handover command message including information of uplink resources for measurements for the terminal, and uses the information of the uplink resources for measurements for the terminal. , transmitting signals to the target base station.

As a result, for example, it is possible to reduce the time for allocating data channels (Data CHs) in consideration of terminal devices immediately after handover. Therefore, it is possible to quickly increase the throughput of the terminal device immediately after handover.

The technical features described above are specific examples of the embodiments of the present invention, and the embodiments of the present invention are not limited to the technical features described above.

<<2. First Embodiment>>
Next, a first embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG.

<2.1. System configuration>
An example of the configuration of a system 1 according to the first embodiment will be described with reference to FIG. FIG. 1 is an explanatory diagram showing an example of a schematic configuration of a system 1 according to the first embodiment. Referring to FIG. 1 , system 1 includes base station 100 , base station 200 and terminal device 300 .

For example, the system 1 may be a system conforming to the 3GPP (Third Generation Partnership Project) standard. More specifically, for example, the system 1 may be a system conforming to the standards/specifications of LTE/LTE-Advanced and/or SAE (System Architecture Evolution). Alternatively, the system 1 may be a system conforming to the fifth generation (5G)/NR (New Radio) standards/specifications. Of course, system 1 is not limited to these examples.

(1) Base station 100
The base station 100 is a node of a radio access network (RAN) and performs radio communication with terminal devices (for example, terminal devices 300 ) located within the coverage area 10 . In the first embodiment, the base station 100 performs wireless communication using beamforming.

Note that the base station 100 may be an eNB (evolved Node B) or a gNB (generation Node B) in 5G. The base station 100 may include multiple units (or multiple nodes). The plurality of units (or nodes) includes a first unit (or first node) that processes a higher protocol layer and a second unit (or a second node) that processes a lower protocol layer. may contain. As an example, the first unit may be referred to as a central unit (Center/Central Unit: CU), and the second unit may be referred to as a distributed unit (DU) or an access unit (AU). may be called As another example, the first unit may be referred to as a digital unit (DU), and the second unit may be referred to as a radio unit (RU) or a remote unit (RU). may be called. The DU (Digital Unit) may be a BBU (Base Band Unit), and the RU may be an RRH (Remote Radio Head) or an RRU (Remote Radio Unit). Of course, the names of the first unit (or first node) and the second unit (or second node) are not limited to this example. Alternatively, base station 100 may be a single unit (or single node). In this case, the base station 100 may be one of the plurality of units (for example, one of the first unit and the second unit), and the other unit of the plurality of units ( For example, it may be connected to the other of the first unit and the second unit).

(2) Base station 200
Like the base station 100 , the base station 200 is a node that performs wireless communication with terminal devices, and performs wireless communication with terminal devices located within the coverage area 20 (for example, the terminal device 300 ).

In the first embodiment, for example, similarly to the base station 100, the base station 200 performs wireless communication with the terminal device using beamforming. Alternatively, the base station 200 may perform wireless communication with the terminal device using beamforming in a manner different from that of the base station 100, or may perform wireless communication with the terminal device without using beamforming. good too.

(3) Terminal device 300
A terminal device 300 performs wireless communication with a base station. For example, the terminal device 300 wirelessly communicates with the base station 100 when located within the coverage area 10 , and wirelessly communicates with the base station 200 when located within the coverage area 20 .

Especially in the first embodiment, the terminal device 300 is handed over from the base station 200 to the base station 100 (due to movement of the terminal device 300, for example). In this case, the base station 200 is the source base station of the handover, and the base station 100 is the target base station of the handover.

<2.2. Configuration of Base Station 100>
Next, an example of the configuration of the base station 100 according to the first embodiment will be described with reference to FIG. FIG. 2 is a block diagram showing an example of a schematic configuration of the base station 100 of the first embodiment. Referring to FIG. 2, the base station 100 includes a wireless communication unit 110, a network communication unit 120, a storage unit 130 and a processing unit 140. FIG.

(1) Wireless communication unit 110
The wireless communication unit 110 wirelessly transmits and receives signals. For example, the wireless communication unit 110 receives signals from terminal devices and transmits signals to the terminal devices.

(2) Network communication unit 120
The network communication unit 120 receives signals from the backhaul and transmits signals to the backhaul.

(3) Storage unit 130
Storage unit 130 temporarily or permanently stores programs and parameters for operation of base station 100 and various data. The program includes one or more instructions for operation of base station 100 .

(4) Processing unit 140
The processing unit 140 provides various functions of the base station 100 . The processing unit 140 includes a first communication processing unit 141 , a second communication processing unit 143 and an acquisition unit 145 . Note that the processing unit 140 may further include components other than these components. That is, the processing unit 140 can perform operations other than those of these components. Specific operations of the first communication processing unit 141, the second communication processing unit 143, and the acquisition unit 145 will be described later in detail.

For example, the processing unit 140 (first communication processing unit 141) communicates with another network node (eg, base station 200) via the network communication unit 120. FIG. For example, the processing unit 140 (second communication processing unit 143) communicates with a terminal device (for example, the terminal device 300) via the wireless communication unit 110. FIG.

(5) Implementation Example The wireless communication unit 110 may be implemented by an antenna, a radio frequency (RF) circuit, or the like, and the antenna may be a directional antenna. The network communication unit 120 may be implemented by a network adapter, network interface card, or the like. The storage unit 130 may be implemented by memory (eg, non-volatile memory and/or volatile memory) and/or hard disk or the like. The processing unit 140 may be implemented by a baseband (BB) processor and/or other processors and the like. The first communication processing unit 141, the second communication processing unit 143, and the acquisition unit 145 may be implemented by the same processor, or may be separately implemented by different processors. The memory (storage unit 130) may be included in such a processor (chip).

The base station 100 may include a memory that stores programs (instructions) and one or more processors capable of executing the programs (instructions). The one or more processors may execute the program and perform the operations of the processing unit 140 (the operations of the first communication processing unit 141, the second communication processing unit 143, and the acquisition unit 145). The program may be a program for causing the processor to execute the operation of the processing unit 140 (the operation of the first communication processing unit 141, the second communication processing unit 143, and the acquisition unit 145).

Note that the base station 100 may be virtualized. That is, the base station 100 may be implemented as a virtual machine. In this case, the base station 100 (virtual machine) may operate as a virtual machine on a physical machine (hardware) including a processor, memory, etc. and a hypervisor.

<2.3. Configuration of Base Station 200>
Next, an example configuration of the base station 200 according to the first embodiment will be described with reference to FIG. FIG. 3 is a block diagram showing an example of a schematic configuration of the base station 200 of the first embodiment. Referring to FIG. 3, the base station 200 includes a wireless communication unit 210, a network communication unit 220, a storage unit 230 and a processing unit 240. FIG.

(1) Wireless communication unit 210
The wireless communication unit 210 wirelessly transmits and receives signals. For example, the wireless communication unit 210 receives signals from terminal devices and transmits signals to the terminal devices.

(2) Network communication unit 220
The network communication unit 220 receives signals from the backhaul and transmits signals to the backhaul.

(3) Storage unit 230
Storage unit 230 temporarily or permanently stores programs and parameters for operation of base station 200 and various data. The program includes one or more instructions for operation of base station 200 .

(4) Processing unit 240
Processing unit 240 provides various functions of base station 200 . The processing section 240 includes a first communication processing section 241 and a second communication processing section 243 . Note that the processing unit 240 may further include components other than these components. That is, the processing unit 240 can perform operations other than those of these components. Specific operations of the first communication processing unit 241 and the second communication processing unit 243 will be described in detail later.

For example, the processing unit 240 (first communication processing unit 241) communicates with another network node (eg, base station 100) via the network communication unit 220. FIG. For example, the processing unit 240 (second communication processing unit 243) communicates with a terminal device (for example, the terminal device 300) via the wireless communication unit 210. FIG.

(5) Implementation Example The wireless communication unit 210 may be implemented by an antenna, a radio frequency (RF) circuit, or the like, and the antenna may be a directional antenna. The network communication unit 120 may be implemented by a network adapter, network interface card, or the like. The storage unit 230 may be implemented by memory (eg, non-volatile memory and/or volatile memory) and/or hard disk or the like. The processing unit 240 may be implemented by a baseband (BB) processor and/or other processors and the like. The first communication processing unit 241 and the second communication processing unit 243 may be implemented by the same processor, or may be separately implemented by different processors. The memory (storage 230) may be included within such a processor (chip).

Base station 200 may include a memory that stores programs (instructions) and one or more processors capable of executing the programs (instructions). The one or more processors may execute the program to perform the operations of the processing unit 240 (the operations of the first communication processing unit 241 and the second communication processing unit 243). The program may be a program for causing the processor to execute the operation of the processing unit 240 (the operation of the first communication processing unit 241 and the second communication processing unit 243).

Note that the base station 200 may be virtualized. That is, the base station 200 may be implemented as a virtual machine. In this case, the base station 200 (virtual machine) may operate as a virtual machine on a physical machine (hardware) including a processor, memory, etc. and a hypervisor.

<2.4. Configuration of Terminal Device 300>
Next, an example of the configuration of the terminal device 300 according to the first embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing an example of a schematic configuration of the terminal device 300 of the first embodiment. Referring to FIG. 4 , the terminal device 300 includes a wireless communication section 310 , a storage section 320 and a processing section 330 .

(1) Wireless communication unit 310
The wireless communication unit 310 wirelessly transmits and receives signals. For example, the wireless communication unit 310 receives signals from base stations and transmits signals to the base stations.

(2) Storage unit 320
The storage unit 320 temporarily or permanently stores programs and parameters for operating the terminal device 300 and various data.

(3) Processing unit 330
The processing unit 330 provides various functions of the terminal device 300 . The processing section 330 includes a reception processing section 331 and a transmission processing section 333 . Note that the processing unit 330 may further include components other than these components. That is, the processing unit 330 can perform operations other than those of these components. Specific operations of the reception processing unit 331 and the transmission processing unit 333 will be described in detail later.

For example, the processing unit 330 communicates with a base station (eg, the base station 100 and/or the base station 200) via the wireless communication unit 310.

(4) Implementation Example The wireless communication unit 310 may be implemented with an antenna, a radio frequency (RF) circuit, and the like. The storage unit 320 may be implemented by memory (eg, non-volatile memory and/or volatile memory) and/or hard disk or the like. Processing unit 330 may be implemented by a baseband (BB) processor and/or other processors, and the like. The reception processing unit 331 and the transmission processing unit 333 may be implemented by the same processor, or may be separately implemented by different processors. The memory (storage 320) may be included within such processor (chip) or may be external to the one or more processors. As an example, the processing unit 330 may be implemented within a SoC (System on Chip).

The terminal device 300 may include a memory that stores programs (instructions) and one or more processors that can execute the programs (instructions). The one or more processors may execute the program to perform the operations of the processing unit 330 (the operations of the reception processing unit 331 and the transmission processing unit 333). The program may be a program for causing the processor to execute the operation of the processing unit 330 (the operation of the reception processing unit 331 and the transmission processing unit 333).

<2.5. Technical features>
Next, technical features of the first embodiment will be described with reference to FIGS. 5 to 8. FIG.

In the first embodiment, the base station 100 (acquisition unit 145) is a response message to a handover message from the source base station (base station 200) of the handover of the terminal device 300, and is related to measurement for the terminal device 300. Get a response message containing uplink resource information. Then, the base station 100 (first communication processing unit 141) transmits the response message to the handover message to the source base station (base station 200).

The information of the uplink resources related to the measurements for the terminal device 300 is information transmitted from the source base station (base station 200) to the terminal device 300. FIG.

That is, the base station 200 (first communication processing unit 241) receives the information including the information of the uplink resource related to the measurement for the terminal device 300 from the target base station (base station 100) of the handover of the terminal device 300. Receive a response message. The base station 200 (second communication processing unit 243 ) then transmits to the terminal device 300 a handover command message including information corresponding to the information of the uplink resource related to the measurement for the terminal device 300 .

Further, the terminal device 300 (reception processing unit 331) receives the handover command message including the information of the uplink resources related to the measurements for the terminal device 300 from the source base station (base station 200). Then, the terminal device 300 (transmission processing unit 333) transmits a signal to the target base station (base station 100) using the information of the uplink resource related to the measurement.

Among other things, the base station 100 (second communication processing unit 143 ) receives a signal transmitted from the terminal device 300 based on the information of the uplink resource related to the measurement for the terminal device 300 .

(1) Uplink resources related to measurements for the terminal device 300 The above measurements for the terminal device 300 are measurements performed by the terminal device 300, for example. That is, the uplink resource related to the measurement for the terminal device 300 is, for example, a resource for the terminal device 300 to transmit measurement information.

Also, the above measurements for the terminal device 300 may be measurements performed by the base station 100 for the terminal device 300, for example. That is, the uplink resource related to the measurement for the terminal device 300 is, for example, a resource for transmitting an uplink reference signal used for measurement for the terminal device 300 (measurement performed by the base station 100). good too.

- Measurement information The information of the uplink resources related to the measurements for the terminal device 300 may include, for example, information related to resources for the terminal device 300 to transmit measurement information. Specifically, the information of the uplink resources for the measurement for the terminal device 300 may include information indicating resources for the terminal device 300 to transmit the measurement information.

More specifically, the measurement information is, for example, CSI (Channel State Information). In other words, the information of the uplink resource related to the measurement for the terminal device 300 is information (CSI resource designation information) specifying uplink resources for the terminal device 300 to transmit CSI.

For example, the target base station (acquisition unit 131 of the base station 100) allocates resources for the terminal device 300 to transmit CSI to uplink resources based on uplink resource allocation information, thereby specifying the CSI resources. Get information. The CSI resource designation information is then transmitted from the source base station (base station 200 ) to the terminal device 300 .

On the other hand, for example, after the terminal device 300 receives the handover command message from the source base station (base station 200), the terminal device 300 (transmission processing unit 333) transfers the CSI to the uplink designated by the CSI resource designation information. It is transmitted to the target base station (base station 200) by mapping to resources.

In this way, the terminal device 300 can promptly transmit the CSI to the target base station (base station 200) after receiving the handover message.

- Uplink reference signals The information of the uplink resources for the measurements for the terminal device 300 may include, for example, information about resources for the terminal device 300 to transmit uplink reference signals. Specifically, the information of the uplink resources for the measurement for the terminal device 300 may include information indicating resources for the terminal device 300 to transmit the uplink reference signal.

The uplink reference signal is a reference signal used for measurements for the terminal device 300 by the base station 100, for example. More specifically, the uplink reference signal is, for example, an SRS (Sounding Reference Signal). In other words, the information of the uplink resource related to the measurement for the terminal device 300 is information (SRS resource designation information) specifying uplink resources for the terminal device 300 to transmit SRS.

For example, the target base station (acquisition unit 131 of the base station 100) allocates resources for the terminal device 300 to transmit SRS to uplink resources based on uplink resource allocation information, thereby specifying the SRS resources. Get information. The SRS resource designation information is then transmitted from the source base station (base station 200 ) to the terminal device 300 .

On the other hand, for example, after the terminal device 300 receives the handover command message from the source base station (base station 200), the terminal device 300 (transmission processing unit 333) transfers the SRS to the uplink designated by the SRS resource designation information. It is transmitted to the target base station (base station 200) by mapping to resources. In this way, the terminal device 300 can promptly transmit the SRS to the target base station (base station 200) after receiving the handover message.

(2) Handover message As described above, the base station 200 (source base station) sends a handover message including the information of the uplink resources related to the measurements for the terminal device 300 to the base station 100 (target base station). Send. The handover message may be sent directly from the base station 200 to the base station 100 (e.g. X2 handover case) or may be sent from the base station 200 to the base station 100 via the core network ( e.g. S1 handover case).

For example, the handover message is a HANDOVER REQUEST message. Also, the response message is a HANDOVER REQUEST ACKNOWLEDGE message. Hereinafter, the example of the first embodiment will be described assuming that the handover message is a handover request message and the response message is a handover request acknowledgment. However, the first embodiment is not limited to the handover request message, and other messages sent from the source base station to the target base station in the handover procedure may be used.

(3) Beam-related information For example, the handover message may include beam-related information about the beam. That is, the base station 100 (first communication processing unit 141) may receive the handover message including the beam-related information from the source base station (base station 200).

In this case, the information of the uplink resources related to the measurement for the terminal device 300 is information of uplink resources within radio resources selected based on the beam-related information, It may be uplink resource information related to the measurement. For example, the base station 100 (acquisition unit 145) allocates uplink resources related to measurement for the terminal device 300 within radio resources selected based on the beam-related information, thereby obtaining the above Said information of said uplink resource for measurements can be obtained.

(3-1) Beam Related Information The beam related information is, for example, second beam related information corresponding to first beam related information transmitted from the terminal device 300 to the source base station (base station 200).

That is, the terminal device 300 (transmission processing unit 333) transmits the first beam-related information to the source base station (base station 200). On the other hand, the base station 200 (second communication processing unit 243 ) receives the first beam-related information from the terminal device 300 . Then, the base station 200 (second communication processing unit 243) transmits a handover message including the second beam-related information corresponding to the first beam-related information to the target base station (base station 100). .

- First beam-related information The first beam-related information is, for example, information about beams transmitted by the target base station (base station 100) using beamforming.

Specifically, the first beam-related information is information about a reference signal transmitted by the target base station (base station 100) using beamforming.

(reference signal transmitted by the target base station)
For example, the base station 100 (first communication processing unit 141) transmits reference signals using multiple beams. The plurality of beams can also be said to be beams for signal transmission by the base station 100 (or beams formed by the base station 100 for signal transmission). The plurality of beams are beams directed in different directions. A beam here means a directional beam, for example formed by multiplying a signal by a set of beamforming weights and transmitting the multiplied signal using a directional antenna. . A specific example of the plurality of beams will be described below with reference to FIG.

FIG. 5 is an explanatory diagram for explaining an example of a plurality of beams through which reference signals are transmitted. Referring to FIG. 5, base station 100, coverage area 10 and 16 beams 11 (beams 11A-11P) are shown. For example, in this way, the base station 100 transmits reference signals using 16 beams 11 . As an example, each beam is identified by a beam index (or weight index). For example, beam 11A is identified by an index of #0 and beam 11J is identified by an index of #9.

(Acquisition of first beam-related information)
For example, the first beam-related information may be obtained based on measurement results of reference signals transmitted by the target base station (base station 100) using beamforming. The first beam-related information may then be included in a measurement report to the source base station (base station 200).

More specifically, the terminal device 300 measures reference signals transmitted by each beam as shown in FIG. 5, for example, and selects a beam with favorable measurement results (eg, favorable received power or received quality). In other words, the terminal device 300 selects preferred beamforming weights. The terminal device 300 then transmits to the base station 200 a measurement report including the first beam-related information about the selected beam and the preferable measurement result.

FIG. 6 is an explanatory diagram for explaining an example of the measurement report of the terminal device 300. As shown in FIG. Referring to FIG. 6, base station 100 and terminal device 300 are shown. For example, the terminal device 300 performs measurements of reference signals transmitted by each beam and selects beams #8, #9, #10 (beams 11I, 11J, 11K) with favorable measurement results. Then, the terminal device 300 uses first beam-related information (for example, beam indexes/weight indexes of #8, #9, and #10) regarding beams #8, #9, and #10 (beams 11I, 11J, and 11K), and A measurement report including the preferable measurement result is transmitted to the base station 200 .

This allows, for example, the base station 200 to obtain first beam-related information about the base station 100 through measurement reports.

- Second beam-related information As described above, the second beam-related information corresponds to the first beam-related information.

For example, the second beam-related information is the same information as the first beam-related information. That is, the base station 200 includes the same second beam-related information as the first beam-related information received from the terminal device 300 in the handover request message, and transmits the handover request message to the base station 100 .

Alternatively, the second beam-related information may be information different from the first beam-related information. For example, the base station 100 may convert the first beam-related information into the second beam-related information and transmit a handover request message including the second beam-related information to the base station 100 .

- Examples of beam-related information The beam-related information (the first beam-related information and the second beam-related information) is information about beams. Since beams are formed using beamforming weights (a set of beamforming weights), beams and sets of beamforming weights may correspond one-to-one to each other. Therefore, the beam-related information can also be said to be information related to beamforming weights (for example, weight-related information).

The beam-related information is information about the base station 100 . For example, the beam-related information is information about beams of the base station 100 (beams used by the base station 100 to transmit signals).

For example, the beam-related information is information about one or more of a plurality of beams. Specifically, for example, the beam-related information is information indicating one or more of the plurality of beams, in other words, information enabling identification of one or more of the plurality of beams ( beam identification information). As an example, the beam-related information is a beam index. Alternatively, the beam-related information may be information indicating one or more sets of the plurality of sets of beamforming weights, in other words identifying one or more sets of the plurality of sets. It may be enabling information (eg weight identification information). As an example, the beam-related information may be a weight index. Since a beam is formed using a set of beamforming weights, there may be a one-to-one correspondence between the beam and the set of beamforming weights. Therefore, the beam-related information is information indicating one or more of the plurality of beams (one or more beam indexes), and the information indicating one or more of the plurality of sets (1 weight index). That is, the beam index and the weight index are called differently, but may be the same index. Of course, the beam-related information may be other named information (such as beam ID, weight ID, beamforming index, or beamforming ID) that allows identification of a beam or set of beamforming weights.

(3-2) Radio resources selected based on beam-related information As described above, the information of the uplink resources related to the measurements for the terminal device 300 is radio selected based on the beam-related information Uplink resource information in resources, which may be uplink resource information related to the measurement for the terminal device 300 .

For example, the information of the uplink resources related to the measurement for the terminal device 300 is information of uplink resources in radio resources corresponding to one or more beams selected based on the beam-related information, Uplink resource information for the above measurements for the terminal device 300 . Alternatively, the information of the uplink resources for the measurements for terminal 300 is the number of uplink resources within radio resources corresponding to one or more sets of beamforming weights selected based on the beam-related information. information, which may be uplink resource information for the terminal device 300 for the above measurements.

Specifically, the information of the uplink resource for the measurement for the terminal device 300 includes identification information of one or more beams/sets of beamforming weights selected based on the beam-related information, and the identification information of information of uplink resources within radio resources corresponding to the set of beams/beamforming weights identified in , including information designating resources for CSI and/or SRS (CSI/SRS resource designation information) be

The terminal device 300 (transmission processing unit 333) selects a radio resource (the first beam-related A radio resource selected based on the second beam-related information corresponding to the information) is used to transmit a signal (eg, CSI and/or SRS, etc.) to the target base station (base station 100).

On the other hand, the base station 100 (second communication processing unit 143), which is the target base station, uses one or more sets of beamforming weights corresponding to the radio resources selected based on the beam-related information, Receive signals (eg, CSI and/or SRS, etc.) transmitted from the terminal device 300 based on the uplink resources for the measurements for the terminal device 300 .

6, the first beam-related information is beams #8, #9, and #10 with good measurement results, and the first beam-related information and the second beam-related information beam related information is the same, the uplink resource for the measurement for terminal equipment 300 is allocated within the radio resource selected based on the beam related information as follows.

That is, the target base station (base station 100) selects one of the three beam candidates (beams #8, #9, and #10) with good measurement results based on the first beam-related information. Or select multiple beams. Then, for example, when one beam #9 is selected, the base station 100 (for example, the acquisition unit 145) stores the uplink related to the measurement for the terminal device 300 in the radio resource corresponding to beam #9. Can allocate resources.

Thereby, the base station 100 (acquisition unit 145) can acquire the information of the uplink resource related to the measurement for the terminal device 300 in the radio resource whose uplink resource corresponds to beam #9. can.

In addition, the terminal device 300 (transmission processing section 333) transmits information on the measurement for the terminal device 300, such as CSI and SRS, based on the information on the uplink resource on the measurement for the terminal device 300. , to the radio resource corresponding to beam #9, it can be transmitted to the target base station (base station 100).

On the other hand, the base station 100 (second communication processing unit 143) can receive a signal (for example, CSI and SRS) transmitted from the terminal device 300 using the set of beamforming weights corresponding to beam #9. can.

(4) Flow of Processing—Example of Processing According to First Embodiment An example of processing according to the first embodiment will be described with reference to FIG. FIG. 7 is a sequence diagram for explaining an example of a schematic flow of processing according to the first embodiment.

The terminal device 300 measures reference signals transmitted by the base station 100 using beamforming, and selects preferable beamforming weights. The terminal device 300 then transmits a measurement report including a weight index indicating the preferred beamforming weight to the base station 200 (source base station) (S401). The measurement report includes, for example, the measurement result of the reference signal.

Thereafter, a handover of the terminal device 300 from the base station 200 (source base station) to the base station 100 (target base station) is decided, and the base station 200 sends a handover request message including a weight index indicating the preferred beamforming weight. , to the base station 100 (S403).

When the base station 100 acquires the weight index contained in the handover request message, the base station 100 selects one or more beams based on the weight index and the resource allocation status within the own base station (base station 100). . Then, the base station 100 updates the resource allocation status in its own base station (base station 100), etc., in the radio resource corresponding to the selected beam, and the uplink for the terminal device 300 to newly transmit CSI and SRS. Allocate resources (S405).

Thereafter, the base station 100 sends a handover request acknowledgment (HANDOVER REQUEST ACKNOWLEDGE) message including information specifying uplink resources for transmitting CSI and SRS (CSI/SRS resource specification information for terminal devices) to the base station 200. Send (S407). Here, the HANDOVER REQUEST ACKNOWLEDGE message also includes an RRC layer handover command message corresponding to a handover instruction.

The base station 200 transmits an RRC signal (for example, an RRCConnectionReconfiguration message) including CSI/SRS resource designation information for the terminal device and the handover command (HandoverCommand) message to the terminal device 300 (S409).

After that, when the handover (S411) is completed, the terminal device 300 transmits CSI and SRS to the base station 100 using the uplink resource designated by the CSI/SRS resource designation information for the terminal device (S413).

Thereafter, the base station 100 allocates DataCH resources based on the CSI and SRS reception results transmitted from the terminal device 300 (S415).

Note that the example of the flow of processing described above is only an outline, and, of course, in the first embodiment, transmission and reception other than steps S401 to S415 described above can also be performed.

- Processing according to Comparative Example of First Embodiment Next, processing according to a comparative example of the first embodiment will be described with reference to FIG. FIG. 8 is a sequence diagram for explaining an example of a schematic flow of processing according to a comparative example of the first embodiment.

The terminal device 1300 measures a reference signal transmitted by the base station 100 and transmits a measurement report to the base station 1200 (serving base station) (S1001). Subsequently, handover of the terminal device 1300 from the base station 1200 (source base station) to the base station 1100 (target base station) is determined, and the base station 1200 transmits a handover request message to the base station 1100 (S1003). . Subsequently, base station 1100 transmits a HANDOVER REQUEST ACKNOWLEDGE message including an RRC layer handover command (HandoverCommand) message corresponding to a handover instruction to base station 1200 (S1005). After that, the base station 1200 transmits an RRC signal (for example, RRCConnectionReconfiguration message) including the handover command (HandoverCommand) message to the terminal device 1300 (S1007).

After that, when the handover (S1009) is completed, the base station 1100 acquires uplink resources for the terminal device 1300 to newly transmit CSI and SRS based on the resource allocation status within the own base station (base station 1100). is assigned (S1013). Subsequently, base station 1100 transmits to terminal device 300 an RRC signal (eg, RRCConnectionReconfiguration message) including information specifying uplink resources for transmitting CSI and SRS (CSI/SRS resource specification information for terminal devices). (S1013). Subsequently, the terminal device 1300 transmits CSI and SRS to the base station 1100 using the uplink resource designated by the CSI/SRS resource designation information for the terminal device (S1015). Subsequently, the base station 1100 allocates DataCH resources based on the CSI and SRS reception results transmitted from the terminal device 1300 (S1017).

-Evaluation According to the process shown in FIG. 7, the CSI/SRS resource designation information for the terminal device is included in the handover request confirmation response and the handover command. For this reason, for example, compared to the case where the terminal device 300 allocates uplink resources for newly transmitting CSI and SRS after handover is completed, as in the processing shown in FIG. 8, the processing shown in FIG. For example, it is possible to allocate DataCH resources in consideration of a terminal device immediately after handover at an earlier timing. Therefore, it is possible to quickly increase the throughput of the terminal device immediately after handover.

(5) Meaning of "transmitting" The term "transmitting" here means, for example, performing transmission processing in at least one protocol layer out of a plurality of protocol layers, and outputs a signal by wire or wirelessly. does not mean to Similarly, "receiving" here means, for example, performing reception processing in at least one protocol layer among a plurality of protocol layers. As an example, the plurality of protocol layers are a physical layer, a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, a PDCP (Packet Data Convergence Protocol) layer, and an RRC (Radio Resource Control) layer. As another example, the plurality of protocol layers are a physical layer, a MAC layer, an IP (Internet Protocol) layer and a transport layer.

Further, "transmitting X to Y" here is not limited to transmitting X directly to Y, but indirectly transmitting X to Y (i.e., transmitting X to another node). and X is sent to Y via forwarding by the other node). Similarly, "receiving X from Y" here is not limited to receiving X directly from Y, but indirectly receiving X from Y (i.e., X transmitted by Y received via transmission by another node).

<<3. Second Embodiment>>
Next, a second embodiment of the present invention will be described with reference to FIGS. 9 to 12. FIG. While the first embodiment described above is a specific embodiment, the second embodiment is a more generalized embodiment.

<3.1. System configuration>
An example of the configuration of the system 2 according to the second embodiment will be described with reference to FIG. FIG. 9 is an explanatory diagram showing an example of a schematic configuration of the system 2 according to the second embodiment. Referring to FIG. 9 , system 2 includes base station 500 , base station 600 and terminal device 700 .

For example, the system 1 may be a system conforming to the 3GPP standards. More specifically, for example, system 1 may be a system compliant with fifth generation (5G) standards.

For example, the description of base station 500, base station 600 and terminal device 700 is the same as the description of base station 100, base station 200 and terminal device 300 in the first embodiment. Therefore, redundant description is omitted here.

<3.2. Configuration of Base Station 500>
Next, an example configuration of the base station 500 according to the second embodiment will be described with reference to FIG. FIG. 10 is a block diagram showing an example of a schematic configuration of the base station 500 of the second embodiment. Referring to FIG. 10 , base station 500 includes acquisition section 510 and first communication processing section 520 .

Specific operations of the acquisition unit 510 and the first communication processing unit 520 will be described later.

The acquisition unit 510 and the first communication processing unit 520 may be implemented by a baseband (BB) processor and/or other processors. Acquisition unit 510 and first communication processing unit 520 may be implemented by the same processor, or may be separately implemented by different processors.

The base station 500 may include a memory that stores a program and one or more processors capable of executing the program. you can go The program may be a program for causing the one or more processors to execute the operations of the acquisition unit 510 and the first communication processing unit 520 .

<3.3. Configuration of Base Station 600>
Next, an example configuration of the base station 600 according to the second embodiment will be described with reference to FIG. FIG. 11 is a block diagram showing an example of a schematic configuration of the base station 600 of the second embodiment. Referring to FIG. 11, base station 600 includes first communication processing section 610 and second communication processing section 620 .

Specific operations of the first communication processing unit 610 and the second communication processing unit 620 will be described later.

The first communication processing unit 610 and the second communication processing unit 620 may be implemented by a baseband (BB) processor and/or other processors. The first communication processing unit 610 and the second communication processing unit 620 may be implemented by the same processor, or may be separately implemented by different processors.

Base station 600 may include a memory that stores a program and one or more processors capable of executing the program. actions may be performed. The program may be a program for causing the one or more processors to execute the operations of the first communication processing unit 610 and the second communication processing unit 620 .

<3.4. Configuration of Terminal Device 700>
Next, an example of the configuration of the terminal device 700 according to the second embodiment will be described with reference to FIG. FIG. 12 is a block diagram showing an example of a schematic configuration of the terminal device 700 of the second embodiment. Referring to FIG. 12 , terminal device 700 includes reception processing section 710 and transmission processing section 720 .

Specific operations of the reception processing unit 710 and the transmission processing unit 720 will be described later.

The receive processing unit 710 and transmit processing unit 720 may be implemented by a baseband (BB) processor and/or other processors and the like. The reception processing unit 710 and the transmission processing unit 720 may be implemented by the same processor, or may be separately implemented by different processors.

The terminal device 700 may include a memory that stores a program and one or more processors that can execute the program. may The program may be a program for causing the one or more processors to execute the operations of the reception processing unit 710 and the transmission processing unit 720 .

<3.5. Technical features>
Next, technical features of the second embodiment will be described.

In the second embodiment, the base station 500 (acquisition unit 510) is a response message to the handover message from the handover source base station (base station 600) of the terminal device 700, Get a response message containing uplink resource information. Then, the base station 500 (first communication processing unit 520) transmits the response message to the handover message to the source base station (base station 600).

Note that the acquisition unit 510 may operate in the same manner as the acquisition unit 145 of the first embodiment, and the first communication processing unit 520 operates in the same manner as the first communication processing unit 141 of the first embodiment. may

In addition, the base station 600 (first communication processing unit 610) receives the information including the information of the uplink resource related to the measurement for the terminal device 700 from the target base station (base station 500) of the handover of the terminal device 700. Receive a response message. The base station 600 (second communication processing unit 620 ) then transmits to the terminal device 700 a handover command message including information corresponding to the information of the uplink resource related to the measurement for the terminal device 700 .

Note that the first communication processing unit 610 may operate in the same manner as the first communication processing unit 241 of the first embodiment, and the second communication processing unit 620 may operate as the second communication processing unit of the first embodiment. It may operate similarly to H.243.

Further, the terminal device 700 (reception processing unit 710) receives the handover command message including the information of the uplink resources related to the measurements for the terminal device 700 from the source base station (base station 600). Then, the terminal device 700 (transmission processing section 720) transmits a signal to the target base station (base station 500) using the information of the uplink resource related to the measurement.

Note that the reception processing unit 710 may operate in the same manner as the reception processing unit 331 of the first embodiment, and the transmission processing unit 720 may operate in the same manner as the transmission processing unit 333 of the first embodiment. good.

As a result, for example, it is possible to reduce the time for allocating data channels (Data CHs) in consideration of terminal devices immediately after handover. Therefore, it is possible to quickly increase the throughput of the terminal device immediately after handover.

<<4. Other embodiments>>
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Those skilled in the art will appreciate that these embodiments are illustrative only and that various modifications can be made without departing from the scope and spirit of the invention.

For example, the steps in the processes described herein do not necessarily have to be executed in chronological order according to the order described in the sequence diagrams. For example, the steps in the process may be performed in an order different from that depicted in the sequence diagrams, or in parallel. Also, some of the steps in the process may be deleted and additional steps may be added to the process.

In addition, a device (for example, a plurality of devices constituting a base station (or unit) or a module for one of said plurality of devices (or units)) may be provided. A device (eg, a module for a terminal device) may be provided that comprises the terminal device components (eg, a receive processor and/or a transmit processor) described herein. A method may also be provided that includes the processing of the above components, and a program may be provided for causing a processor to execute the processing of the above components. Also, a non-transitory computer readable medium recording the program may be provided. Of course, such devices, modules, methods, programs, and computer-readable non-transitory recording media are also included in the present invention.

Some or all of the above embodiments may also be described in the following additional remarks, but are not limited to the following.

(Appendix 1)
an obtaining unit for obtaining a response message to a handover message from a handover source base station of a terminal, the response message including uplink resource information related to measurements for the terminal;
and a first communication processing unit that transmits the response message to the handover message to the source base station.

(Appendix 2)
3. The apparatus of claim 1, wherein the information of the uplink resources for the measurements for the terminal includes information about resources for the terminal to transmit measurement information.

(Appendix 3)
3. The apparatus of claim 2, wherein the information of the uplink resources for the measurements for the terminal includes information indicating resources for the terminal to transmit the measurement information.

(Appendix 4)
4. The apparatus according to appendix 2 or 3, wherein the measurement information is CSI (Channel State Information).

(Appendix 5)
5. The apparatus according to any one of the preceding clauses 1-4, wherein the information of the uplink resources for the measurements for the terminal comprises information on resources for the terminal to transmit uplink reference signals. .

(Appendix 6)
6. The apparatus of claim 5, wherein the information of the uplink resources for the measurements for the terminal includes information indicating resources for the terminal to transmit uplink reference signals.

(Appendix 7)
7. The apparatus according to appendix 5 or 6, wherein the uplink reference signal is an SRS (Sounding Reference Signal).

(Appendix 8)
8. The apparatus according to any one of the preceding clauses, wherein the information of the uplink resource regarding the measurements for the terminal is information transmitted from the source base station to the terminal.

(Appendix 9)
9. The apparatus of claim 8, further comprising a second communication processing unit that receives signals transmitted from the terminal based on the information of the uplink resource regarding the measurements for the terminal.

(Appendix 10)
The first communication processing unit receives a handover message including beam-related information about a beam from the source base station,
The information of the uplink resources related to the measurements for the terminal is information of uplink resources within radio resources selected based on the beam related information, wherein the information relates to the measurements for the terminal. 9. Apparatus according to any one of clauses 1 to 8, which is information of uplink resources.

(Appendix 11)
Further comprising a second communication processing unit that transmits a beam using beamforming,
11. The apparatus of claim 10, wherein the beam-related information is information about beams transmitted by the apparatus using beamforming.

(Appendix 12)
the terminal based on the information of the uplink resource for the measurement for the terminal using one or more sets of beamforming weights corresponding to the radio resources selected based on the beam related information; 11. The device according to claim 10, further comprising a second communication processing unit that receives signals transmitted from the device.

(Appendix 13)
13. Apparatus according to any one of clauses 10-12, wherein the beam related information is information relating to one or more of a plurality of beams.

(Appendix 14)
14. The apparatus of clause 13, wherein the beam-related information is information indicative of one or more of the plurality of beams.

(Appendix 15)
The information of the uplink resources related to the measurement for the terminal device is information of uplink resources within radio resources corresponding to one or more beams selected based on the beam-related information, wherein the terminal 15. A device according to clause 13 or 14, which is uplink resource information for said measurement for the device.

(Appendix 16)
13. The apparatus of any one of clauses 10-12, wherein the beam-related information is information indicative of one or more sets of a plurality of sets of beamforming weights.

(Appendix 17)
The information of the uplink resources for the measurements for the terminal is information of uplink resources within radio resources corresponding to one or more sets of beamforming weights selected based on the beam-related information. 17. The apparatus of clause 15 or 16, wherein the apparatus is uplink resource information for the measurement for the terminal.

(Appendix 18)
18. The apparatus according to any one of clauses 10-17, wherein the beam related information corresponds to beam related information transmitted from the terminal to the source base station.

(Appendix 19)
19. Any one of Appendices 1 to 18, wherein the device is a base station, one or more of a plurality of devices that constitute a base station, or a module for one of the plurality of devices Apparatus as described in paragraph.

(Appendix 20)
a first communication processing unit for receiving a response message to a handover message sent to a handover target base station of a terminal, the response message including uplink resource information related to measurements for the terminal;
and a second communication processing unit configured to send a handover command message to the terminal device, the handover command message including information corresponding to the information of the uplink resource relating to the measurements for the terminal device.

(Appendix 21)
21. The apparatus of claim 20, wherein the information of the uplink resources for the measurements for the terminal comprises information on resources for the terminal to transmit measurement information.

(Appendix 22)
22. The apparatus of clause 21, wherein the information of the uplink resources for the measurements for the terminal includes information indicating resources for the terminal to transmit measurement information.

(Appendix 23)
23. The device according to appendix 21 or 22, wherein the measurement information of the terminal device is CSI (Channel State Information).

(Appendix 24)
24. The apparatus according to any one of clauses 20-23, wherein the information of the uplink resources for the measurements for the terminal comprises information about resources for the terminal to transmit uplink reference signals. .

(Appendix 25)
25. The apparatus of clause 24, wherein the information of the uplink resources for the measurements for the terminal includes information indicating resources for the terminal to transmit uplink reference signals.

(Appendix 26)
26. The apparatus of claim 25, wherein the uplink reference signal is an SRS (Sounding Reference Signal).

(Appendix 27)
The second communication processing unit receives first beam-related information about the beam from the terminal device,
The first communication processing unit transmits a handover message including second beam-related information corresponding to the first beam-related information to the target base station;
The information of the uplink resources related to the measurement for the terminal is information of uplink resources within radio resources selected based on the second beam-related information, 27. Apparatus according to any one of clauses 20 to 26, wherein the uplink resource information for said measurements.

(Appendix 28)
28. The apparatus of claim 27, wherein the first beam-related information is information about beams transmitted using beamforming by the target base station.

(Appendix 29)
29. Apparatus according to clause 27 or 28, wherein said second beam related information is the same information as said first beam related information.

(Appendix 30)
The second communication processing unit receives a measurement report transmitted from the terminal device,
the measurement report includes the first beam-related information;
30. Apparatus according to any one of clauses 27-29.

(Appendix 31)
31. Any one of appendices 20 to 30, wherein the device is a base station, one or more of a plurality of devices constituting a base station, or a module for one of the plurality of devices Apparatus as described in paragraph.

(Appendix 32)
a reception processing unit for receiving, from a source base station of a handover of a terminal, a handover command message containing information of uplink resources relating to measurements for the terminal;
a transmission processor for transmitting a signal to the handover target base station based on the information of the uplink resource regarding the measurements for the terminal.

(Appendix 33)
33. The apparatus of clause 32, wherein the information of the uplink resources for the measurements for the terminal comprises information about resources for the terminal to transmit measurement information.

(Appendix 34)
34. The apparatus of clause 33, wherein the information of the uplink resources for the measurements for the terminal includes information indicating resources for the terminal to transmit measurement information.

(Appendix 35)
35. The device according to appendix 33 or 34, wherein the measurement information of the terminal device is CSI (Channel State Information).

(Appendix 36)
36. The apparatus according to any one of clauses 32-35, wherein the information of the uplink resources for the measurements for the terminal comprises information about resources for the terminal to transmit uplink reference signals. .

(Appendix 37)
37. The apparatus of clause 36, wherein the information of the uplink resources for the measurements for the terminal includes information indicating resources for the terminal to transmit uplink reference signals.

(Appendix 38)
38. The apparatus of clause 37, wherein the uplink reference signal is an SRS (Sounding Reference Signal).

(Appendix 39)
The transmission processing unit transmits first beam-related information about a beam to the source base station;
The information of the uplink resources related to the measurements for the terminal device is information of uplink resources within radio resources selected based on second beam-related information corresponding to the first beam-related information. 39. The apparatus of any one of clauses 32-38, wherein the apparatus is uplink resource information related to the measurements for the terminal.

(Appendix 40)
40. The apparatus of clause 39, wherein the first beam-related information is information about beams transmitted using beamforming by the target base station.

(Appendix 41)
The transmission processing unit transmits a measurement report to the source base station,
41. Apparatus according to clause 39 or 40, wherein said measurement report includes said first beam related information.

(Appendix 42)
The transmission processing unit selects a radio resource based on the second beam-related information corresponding to the first beam-related information, based on the information of the uplink resource related to the measurement for the terminal device. 42. The apparatus according to any one of clauses 39 to 41, wherein the apparatus transmits signals to the handover target base station using .

(Appendix 43)
42. Apparatus according to any one of the clauses 32-41, wherein the apparatus is a terminal or a module for a terminal.

(Appendix 44)
obtaining a response message to a handover message from a handover source base station of a terminal, the response message including information of uplink resources related to measurements for the terminal;
and sending the response message to the handover message to the source base station.

(Appendix 45)
receiving a response message to a handover message sent to a handover target base station of a terminal, the response message comprising information of uplink resources for measurements for the terminal;
sending to the terminal a handover command message containing information corresponding to the information of the uplink resource regarding the measurements for the terminal.

(Appendix 46)
receiving from a handover source base station of a terminal a handover command message including uplink resource information for measurements for the terminal;
transmitting a signal to a target base station for the handover based on the information of the uplink resource regarding the measurements for the terminal.

(Appendix 47)
obtaining a response message to a handover message from a handover source base station of a terminal, the response message including information of uplink resources related to measurements for the terminal;
sending the response message to the handover message to the source base station.

(Appendix 48)
receiving a response message to a handover message sent to a handover target base station of a terminal, the response message comprising information of uplink resources for measurements for the terminal;
sending to said terminal a handover command message containing information corresponding to said information of said uplink resource relating to said measurements for said terminal.

(Appendix 49)
receiving from a handover source base station of a terminal a handover command message including uplink resource information for measurements for the terminal;
transmitting a signal to a target base station for said handover based on said information of said uplink resource relating to said measurements for said terminal.

(Appendix 50)
obtaining a response message to a handover message from a handover source base station of a terminal, the response message including information of uplink resources related to measurements for the terminal;
A readable recording medium recording a program for causing a processor to execute: transmitting the response message to the handover message to the source base station.

(Appendix 51)
receiving a response message to a handover message sent to a handover target base station of a terminal, the response message comprising information of uplink resources for measurements for the terminal;
sending to the terminal a handover command message containing information corresponding to the information of the uplink resource relating to the measurements for the terminal; and recoding media.

(Appendix 52)
receiving from a handover source base station of a terminal a handover command message including uplink resource information for measurements for the terminal;
transmitting a signal to the handover target base station based on the information of the uplink resource relating to the measurements for the terminal device.

In a mobile communication system, it is possible to quickly increase the throughput of a terminal device immediately after handover.

1, 2 System 100, 200, 500, 600 Base Station 300, 700 Terminal Device 141, 241, 520, 610 First Communication Processing Section 143, 243, 620 Second Communication Processing Section 145, 510 Acquisition Section

Claims (6)

an obtaining unit for obtaining a response message to a handover message from a handover source base station of a terminal, the response message including uplink resource information related to measurements for the terminal;
a first communication processing unit that transmits the response message to the handover message to the source base station ;
The first communication processing unit receives a handover message including beam-related information about a beam from the source base station,
The information of the uplink resources for the measurement for the terminal is information of uplink resources within radio resources selected based on the beam-related information, wherein the terminal transmits an uplink reference signal. Information that indicates a resource for transmission,
The target base station, wherein the uplink reference signal is an SRS (Sounding Reference Signal). 2. The target base station of claim 1 , wherein the information of the uplink resource regarding the measurements for the terminal is information transmitted from the source base station to the terminal. Further comprising a second communication processing unit that transmits a beam using beamforming,
The target base station according to claim 1 , wherein the beam-related information is information about beams transmitted by the target base station using beamforming. the terminal based on the information of the uplink resource for the measurement for the terminal using one or more sets of beamforming weights corresponding to the radio resources selected based on the beam related information; 2. The target base station according to claim 1 , further comprising a second communication processing unit that receives signals transmitted from the device. The target base station according to any one of claims 1 to 4 , wherein the beam related information corresponds to beam related information transmitted from the terminal to the source base station. receiving a handover message including beam-related information about the beam from the source base station of the handover of the terminal;
obtaining a response message to the handover message, the response message including uplink resource information for measurements for the terminal;
sending the response message to the handover message to the source base station;
The information of the uplink resources for the measurement for the terminal is information of uplink resources within radio resources selected based on the beam-related information, wherein the terminal transmits an uplink reference signal. Information that indicates a resource for transmission,
The method performed by the target base station, wherein the uplink reference signal is an SRS (Sounding Reference Signal) .

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