JP2022058975A - Apparatus related to radio access network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a prompt increase in throughput of a terminal apparatus immediately after handover.

SOLUTION: An apparatus of the present invention includes: an acquisition unit 145 configured to acquire a response message for a handover message from a source base station (base station 200) in handover of a terminal apparatus 300, which includes information of uplink resources related to measurement for the terminal apparatus 300; and a first communication processing unit 141 configured to transmit the response message for the handover message to the source base station (base station 200).

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a device related to a radio access network.

In addition to the frequency bands of several hundred megahertz band and several gigahertz band currently used, a higher frequency band of several tens of gigahertz band can be used to realize the dramatic capacity expansion of the mobile network. In particular, in the 5th generation (5G), in order to utilize such a band, it is considered to transmit a signal to a user by forming a sharp directional beam using a large number of antennas.

In the higher frequency band, all downlink signals / downlink channels, including not only system information and paging information, but also common pilot signals or reference signals, etc., use beam forming to compensate for large propagation losses. It is also possible that it will be sent. Similarly, for uplinks, it is possible that all uplink signals / uplink channels are received using beamforming to compensate for propagation loss.

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

Japanese Patent Publication No. 2014-531852

However, in the technique disclosed in Patent Document 1, the target base station of the handover destination takes time to allocate the data channel (Data CH) in consideration of the terminal device immediately after the handover. Therefore, there is a problem that the throughput of the terminal device is difficult to increase immediately after the handover.

An object of the present invention is to provide an apparatus capable of rapidly increasing the throughput of a terminal apparatus immediately after handover.

The base station of the present invention is a response message to a handover message from the source base station of the handover of the terminal device, and includes an acquisition unit for acquiring a response message including information on an uplink resource related to measurement for the terminal device.
It includes 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 the terminal device immediately after the handover. It should be noted that according to the present invention, other effects may be produced in place of or in combination with the effect.

FIG. 1 is an explanatory diagram showing an example of a schematic configuration of the 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 to which a reference signal is transmitted. FIG. 6 is an explanatory diagram for explaining an example of a measurement report of the terminal device 300. 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 the present specification and the drawings, the same reference numerals may be given to elements that can be similarly described, so that duplicate description may be omitted.

The explanations are given in the following order.
1. 1. Outline of the embodiment of the present 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 embodiments

<< 1. Outline of the embodiment of the present invention >>
First, the outline of the embodiment of the present invention will be described.

(1) Technical issues In addition to the frequency bands of several hundred megahertz band and several gigahertz band currently used, the frequency band of several tens of gigahertz band is used to realize the dramatic capacity expansion of mobile networks. Can be done. In particular, in the 5th generation (5G), in order to utilize such a band, it is considered to transmit a signal to a user by forming a sharp directional beam using a large number of antennas.

In the higher frequency band, all downlink signals / downlink channels, including not only system information and paging information, but also common pilot signals or reference signals, etc., use beam forming to compensate for large propagation losses. It is also possible that it will be sent. Similarly, for uplinks, it is possible that all uplink signals / uplink channels are received using beamforming to compensate for propagation loss.

For example, in the patent document (Japanese Patent Laid-Open No. 2014-531852), the downlink beam ID and the uplink beam ID are included in the handover request message transmitted from the source base station of the handover of the terminal device to the target base station. The technology is disclosed. Further, 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 the handover, and the uplink beam ID is from the terminal device after the handover. Used to direct the uplink beam to receive the data. This makes it possible to omit the operation for selecting the beam at the time of handover, and the delay of handover becomes small.

However, in the technology disclosed in the above patent document, the target base station of the handover destination takes time to allocate the data channel (Data CH) in consideration of the terminal device immediately after the handover. Therefore, 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 the handover.

(2) Technical Features In the embodiment of the present invention, for example, the target base station for handover is a response message to a handover message from the source base station for handover of the terminal device, and the measurement for the terminal device is improved. The response message including the information of the link resource is acquired, and the response message to the handover message is transmitted to the source base station.

Further, for example, the source base station receives from the target base station the response message including the above information of the uplink resource regarding the measurement for the terminal device, and relates to the measurement for the terminal device. A handover command message including the information corresponding to the information of the uplink resource is transmitted to the terminal device.

Further, for example, the terminal device receives a handover command message including information on the uplink resource related to the measurement for the terminal device from the source base station, and uses the information on the uplink resource related to the measurement. , Sends a signal to the target base station.

This makes it possible to save time, for example, for allocating a data channel (Data CH) in consideration of the terminal device immediately after the handover. Therefore, it is possible to quickly increase the throughput of the terminal device immediately after the handover.

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

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

<2.1. System configuration>
An example of the configuration of the 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 the system 1 according to the first embodiment. Referring to FIG. 1, the system 1 includes a base station 100, a base station 200 and a terminal device 300.

For example, the system 1 may be a system compliant with a standard of 3GPP (Third Generation Partnership Project). More specifically, for example, the system 1 may be a system compliant with LTE / LTE-Advanced and / or SAE (System Architecture Evolution) standards / specifications. Alternatively, the system 1 may be a system compliant with the 5th generation (5G) / NR (New Radio) standard / specification. 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 wireless communication with a terminal device (for example, a terminal device 300) located in the coverage area 10. In the first embodiment, the base station 100 performs wireless communication using beamforming.

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 a plurality of units (or a plurality of nodes). The plurality of units (or a plurality of nodes) include a first unit (or a first node) that processes an upper protocol layer and a second unit (or a second node) that processes a lower protocol layer. It may be included. As an example, the first unit may be referred to as a central unit (Center / Central Unit: CU), and the second unit may be 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 wireless unit (Radio Unit: RU) or a remote unit (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 the first node) and the second unit (or the second node) are not limited to this example. Alternatively, the base station 100 may be a single unit (or a 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 among the plurality of units (for example, one of the first unit and the second unit). For example, it may be connected to the first unit and the other of the second unit).

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

In the first embodiment, for example, the base station 200 performs wireless communication with the terminal device by using beamforming, similarly to the base station 100. 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. May be good.

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

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

<2.2. Configuration of base station 100>
Next, an example of the configuration of the base station 100 of 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.

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

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

(3) Storage unit 130
The storage unit 130 temporarily or permanently stores programs and parameters for the operation of the base station 100, as well as various data. The program includes one or more instructions for the 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. The processing unit 140 may further include other components other than these components. That is, the processing unit 140 may perform operations other than the operations of these components. The specific operations of the first communication processing unit 141, the second communication processing unit 143, and the acquisition unit 145 will be described in detail later.

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

(5) Implementation Example The wireless communication unit 110 may be mounted 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 mounted by a network adapter, a network interface card, or the like. The storage unit 130 may be mounted by a memory (for example, a non-volatile memory and / or a volatile memory) and / or a hard disk. The processing unit 140 may be implemented by a baseband (BB) processor and / or another processor or 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 for storing a program (instruction) and one or more processors capable of executing the program (instruction). The one or more processors may execute the above program to perform 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). The above 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).

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, a memory, and the like, and a hypervisor.

<2.3. Configuration of base station 200>
Next, an example of the configuration of the base station 200 of 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.

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

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

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

(4) Processing unit 240
The processing unit 240 provides various functions of the base station 200. The processing unit 240 includes a first communication processing unit 241 and a second communication processing unit 243. The processing unit 240 may further include other components other than these components. That is, the processing unit 240 may perform operations other than the operations of these components. The 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 (for example, the base station 100) via the network communication unit 220. For example, the processing unit 240 (second communication processing unit 243) communicates with the terminal device (for example, the terminal device 300) via the wireless communication unit 210.

(5) Implementation Example The wireless communication unit 210 may be mounted 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 mounted by a network adapter, a network interface card, or the like. The storage unit 230 may be mounted by a memory (for example, a non-volatile memory and / or a volatile memory) and / or a hard disk. The processing unit 240 may be implemented by a baseband (BB) processor and / or another processor or 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 unit 230) may be included in such a processor (chip).

The base station 200 may include a memory for storing a program (instruction) and one or more processors capable of executing the program (instruction). The one or more processors may execute the above program to perform the operation of the processing unit 240 (the operation of the first communication processing unit 241 and the second communication processing unit 243). The above 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).

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, a memory, and the like, and a hypervisor.

<2.4. Configuration of terminal device 300>
Next, an example of the configuration of the terminal device 300 of 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 unit 310, a storage unit 320, and a processing unit 330.

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

(2) Storage unit 320
The storage unit 320 temporarily or permanently stores programs and parameters for the operation of the terminal device 300, as well as various data.

(3) Processing unit 330
The processing unit 330 provides various functions of the terminal device 300. The processing unit 330 includes a reception processing unit 331 and a transmission processing unit 333. The processing unit 330 may further include other components other than these components. That is, the processing unit 330 may perform operations other than the operations of these components. The 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 (for example, a base station 100 and / or a base station 200) via a wireless communication unit 310.

(4) Mounting example The wireless communication unit 310 may be mounted by an antenna, a radio frequency (RF) circuit, or the like. The storage unit 320 may be mounted by a memory (for example, a non-volatile memory and / or a volatile memory) and / or a hard disk. The processing unit 330 may be implemented by a baseband (BB) processor and / or another processor or 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 unit 320) may be contained in such a processor (chip), or may be outside the one or more processors. As an example, the processing unit 330 may be implemented in the SoC (System on Chip).

The terminal device 300 may include a memory for storing a program (instruction) and one or more processors capable of executing the program (instruction). The one or more processors may execute the above program to perform the operation of the processing unit 330 (the operation of the reception processing unit 331 and the transmission processing unit 333). The above 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, the technical features of the first embodiment will be described with reference to FIGS. 5 to 8.

In the first embodiment, the base station 100 (acquisition unit 145) is a response message to the handover message from the source base station (base station 200) of the handover of the terminal device 300, and relates to the measurement for the terminal device 300. Get a response message containing information about the uplink resource. 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 resource relating to the measurement for the terminal device 300 is information transmitted from the source base station (base station 200) to the terminal device 300.

That is, the base station 200 (first communication processing unit 241) includes the above information of the uplink resource regarding 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. Then, the base station 200 (second communication processing unit 243) transmits a handover command message including information corresponding to the information of the uplink resource related to the measurement for the terminal device 300 to the terminal device 300.

Further, the terminal device 300 (reception processing unit 331) receives the handover command message including the information of the uplink resource regarding the measurement 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.

In particular, the base station 100 (second communication processing unit 143) receives a signal transmitted from the terminal device 300 based on the above information of the uplink resource for the measurement for the terminal device 300.

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

Further, the measurement for the terminal device 300 may be, for example, a measurement performed by the base station 100 for the terminal device 300. That is, the uplink resource relating to the measurement for the terminal device 300 is, for example, a resource for transmitting an uplink reference signal used for the measurement for the terminal device 300 (measurement performed by the base station 100). May be good.

-Measurement information The information in the uplink resource for the measurement for the terminal device 300 may include, for example, information about the resource for the terminal device 300 to transmit the measurement information. Specifically, the information of the uplink resource relating to the measurement for the terminal device 300 may include information indicating a resource 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 above-mentioned information of the above-mentioned uplink resource regarding the above-mentioned measurement for the terminal device 300 is information (CSI resource designation information) for designating the uplink resource for the terminal device 300 to transmit the CSI.

For example, the target base station (acquisition unit 131 of the base station 100) designates the CSI resource by allocating a resource for the terminal device 300 to transmit the CSI to the uplink resource based on the uplink resource allocation information or the like. Get information. Then, the CSI resource designation information is 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) assigns the CSI to the uplink designated by the CSI resource designation information. By mapping to a resource, it is transmitted to the target base station (base station 200).

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

-The information on the uplink resource for the measurement for the uplink reference signal terminal device 300 may include, for example, information about the resource for the terminal device 300 to transmit the uplink reference signal. Specifically, the information of the uplink resource relating to the measurement for the terminal device 300 may include information indicating the resource for the terminal device 300 to transmit the uplink reference signal.

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

For example, the target base station (acquisition unit 131 of the base station 100) designates the SRS resource by allocating a resource for the terminal device 300 to transmit the SRS to the uplink resource based on the uplink resource allocation information or the like. Get information. Then, the SRS resource designation information is 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) assigns the SRS to the uplink designated by the SRS resource designation information. By mapping to a resource, it is transmitted to the target base station (base station 200). In this way, the terminal device 300 can immediately 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 above information of the uplink resource related to the measurement for the terminal device 300 to the base station 100 (target base station). Send. The handover message may be transmitted directly from the base station 200 to the base station 100 (for example, in the case of X2 handover), or may be transmitted from the base station 200 to the base station 100 via the core network (for example, the case of X2 handover). For example, the case of S1 handover).

For example, the handover message is a handover request (HANDOVER REQUEST) message. Further, the above response message is a handover request confirmation response (HANDOVER REQUEST ACKNOWLEDGE) message. Hereinafter, an 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 confirmation response. However, in the first embodiment, the handover request message is not limited, and other messages transmitted from the source base station to the target base station may be used in the handover procedure.

(3) Beam-related information For example, the handover message may include beam-related information regarding 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 resource regarding the measurement for the terminal device 300 is the information of the uplink resource in the radio resource selected based on the beam-related information, and is for the terminal device 300. It may be information on uplink resources related to the above measurement. For example, the base station 100 (acquisition unit 145) allocates the measurement uplink resource for the terminal device 300 into the radio resource selected based on the beam-related information, thereby the above-mentioned for the terminal device 300. The above information of the above uplink resource regarding the measurement can be obtained.

(3-1) Beam-related information The beam-related information is, for example, second beam-related information corresponding to the 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 a beam 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 a reference signal by a plurality of beams. The plurality of beams can also be said to be a beam to which the base station 100 transmits a signal (or a beam formed by the base station 100 to transmit a signal). The plurality of beams are beams oriented in different directions from each other. The 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. .. Hereinafter, specific examples of the plurality of beams will be described with reference to FIG.

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

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

More specifically, the terminal device 300 measures the reference signal transmitted by each beam, for example, as shown in FIG. 5, and selects a beam with a preferable measurement result (for example, preferable received power or reception quality). In other words, the terminal device 300 selects a preferred beamforming weight. Then, the terminal device 300 transmits a measurement report including the first beam-related information regarding the selected beam and the preferable measurement result to the base station 200.

FIG. 6 is an explanatory diagram for explaining an example of a measurement report of the terminal device 300. With reference to FIG. 6, the base station 100 and the terminal device 300 are shown. For example, the terminal device 300 measures the reference signal transmitted by each beam and selects beams # 8, # 9, # 10 (beams 11I, 11J, 11K) with favorable measurement results. Then, the terminal device 300 together with the first beam-related information (for example, the beam index / weight index of # 8, # 9, # 10) regarding the beams # 8, # 9, # 10 (beams 11I, 11J, 11K). A measurement report including the above-mentioned preferable measurement result is transmitted to the base station 200.

This allows, for example, the base station 200 to acquire 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 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.

-Example of beam-related information The beam-related information (the first beam-related information and the second beam-related information) is information related to the beam. Since the beam is formed using beamforming weights (sets of beamforming weights), the beam and the set of beamforming weights can correspond one-to-one with each other. Therefore, the beam-related information can 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 a beam of a base station 100 (a beam used by the base station 100 to transmit a signal).

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 that enables identification of one or more of the plurality of beams (in other words, the information that enables identification of one or more of the plurality of beams. For example, 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 a plurality of sets of beamforming weights, in other words, identification of one or more sets of the plurality of sets. It may be information that enables (for example, weight identification information). As an example, the beam-related information may be a weight index. Since the beam is formed using a set of beamforming weights, the beam and the set of beamforming weights can correspond one-to-one with each other. Therefore, the beam-related information is information indicating one or more of the plurality of beams (one or more beam indexes), and the above information (1) indicating one or more of the plurality of sets. It may be one or more weight indexes). That is, the beam index and the weight index may be called the same index, although they are called differently. Of course, the beam-related information may be information of other names (beam ID, weight ID, beamforming index, beamforming ID, etc.) that allows identification of a beam or a set of beamforming weights.

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

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

Specifically, the information in the uplink resource for the measurement for the terminal device 300 includes identification information for one or more beam / beamforming weight sets selected based on the beam-related information, and the identification information. Information on uplink resources within the radio resource corresponding to the set of beam / beamforming weights identified in, including information specifying resources for CSI and / or SRS (CSI / SRS resource specification information). Is done.

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

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. Receives a signal (eg, CSI and / or SRS, etc.) transmitted from the terminal device 300 based on the uplink resource for the measurement for the terminal device 300.

To explain by applying the specific example shown in FIG. 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 are described. If the beam-related information of the above is the same, the uplink resource for the measurement for the terminal device 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) is 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 (eg, acquisition unit 145) has the uplink for the measurement for the terminal device 300 in the radio resource corresponding to the beam # 9. Resources can be allocated.

As a result, the base station 100 (acquisition unit 145) can acquire the above information of the uplink resource regarding the measurement for the terminal device 300 in the radio resource corresponding to the beam # 9. can.

Further, the terminal device 300 (transmission processing unit 333) provides information on the measurement for the terminal device 300 such as CSI and SRS based on the information on the uplink resource related to the measurement for the terminal device 300. , Can be transmitted to the target base station (base station 100) by mapping to the radio resource corresponding to the beam # 9.

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

(4) Flow of processing-Example of processing according to the first embodiment With reference to FIG. 7, an example of processing according to the first embodiment will be described. 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 the reference signal transmitted by the base station 100 using beamforming and selects a preferred beamforming weight. Then, the terminal device 300 transmits a measurement report including a weight index indicating the preferable beamforming weight to the base station 200 (source base station) (S401). The measurement report includes, for example, the measurement result of the reference signal.

After that, the handover of the terminal device 300 from the base station 200 (source base station) to the base station 100 (target base station) is determined, and the base station 200 sends a handover request message including a weight index indicating the preferable beam forming weight. , Sent to base station 100 (S403).

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

After that, the base station 100 sends a handover request confirmation response (HANDOVER REQUEST ACKNOWLEDGE) message including information for designating the uplink resource for transmitting the CSI and SRS (CSI / SRS resource designation information for the terminal device) to the base station 200. Send (S407). Here, the handover request confirmation response (HANDOVER REQUEST ACKNOWLEDGE) message also includes the RRC layer handover command (Handover Command) message corresponding to the handover instruction.

The base station 200 transmits an RRC signal (for example, RRCConnectionReconfiguration message) including the 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 the CSI and SRS to the base station 100 using the uplink resource specified in the CSI / SRS resource designation information for the terminal device (S413).

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

It should be noted that the above-mentioned example of the processing flow is only a schematic one, and of course, in the first embodiment, transmission / reception other than the above-mentioned steps S401 to S415 may be performed.

-Processing According to the Comparative Example of the First Embodiment Next, the processing according to the 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 the reference signal transmitted by the base station 100, and transmits the measurement report to the base station 1200 (serving base station) (S1001). Subsequently, the 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, the base station 1100 transmits a handover request confirmation response (HANDOVER REQUEST ACKNOWLEDGE) message including a handover command (Handover Command) message of the RRC layer corresponding to the handover instruction to the 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 has an uplink resource for the terminal device 1300 to newly transmit CSI and SRS based on the resource allocation status in the own base station (base station 1100). Is assigned (S1013). Subsequently, the base station 1100 transmits an RRC signal (for example, RRCConnectionReconfiguration message) including information for designating the uplink resource for transmitting the CSI and SRS (CSI / SRS resource designation information for the terminal device) to the terminal device 300. (S1013). Subsequently, the terminal device 1300 transmits CSI and SRS to the base station 1100 using the uplink resource specified in the CSI / SRS resource designation information for the terminal device (S1015). Subsequently, the base station 1100 allocates DataCH resources based on the reception results of the CSI and SRS transmitted from the terminal device 1300 (S1017).

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

(5) Meaning of "transmit" Here, "transmit" means that transmission processing is performed in at least one protocol layer among a plurality of protocol layers, and a signal is output by wire or wirelessly. Doesn't mean to do. Similarly, “reception” 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 (that is, transmitting X to another node). And X is transmitted to Y via transfer 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 (that is, X transmitted by Y). Is received via transfer by another node).

<< 3. Second embodiment >>
Subsequently, a second embodiment of the present invention will be described with reference to FIGS. 9 to 12 and FIG. The first embodiment described above is a specific embodiment, while 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. 9. 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, the system 2 includes a base station 500, a base station 600 and a terminal device 700.

For example, the system 1 may be a system compliant with the 3GPP standard. More specifically, for example, the system 1 may be a system compliant with the 5th generation (5G) standard.

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

<3.2. Configuration of base station 500>
Next, an example of the configuration of the base station 500 of 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, the base station 500 includes an acquisition unit 510 and a first communication processing unit 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 another processor or the like. The acquisition unit 510 and the 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 for storing a program and one or more processors capable of executing the program, and the one or more processors operate the acquisition unit 510 and the first communication processing unit 520. You may go. The program may be a program for causing one or more of the 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 of the configuration of the base station 600 of 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, the base station 600 includes a first communication processing unit 610 and a second communication processing unit 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 another processor or the like. The first communication processing unit 610 and the second communication processing unit 620 may be mounted by the same processor, or may be separately mounted by different processors.

The base station 600 may include a memory for storing a program and one or more processors capable of executing the program, and the one or more processors include a first communication processing unit 610 and a second communication processing unit 620. You may perform the operation of. The program may be a program for causing one or more of the above 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, with reference to FIG. 12, an example of the configuration of the terminal device 700 of the second embodiment will be described. 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, the terminal device 700 includes a reception processing unit 710 and a transmission processing unit 720.

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

The reception processing unit 710 and the transmission processing unit 720 may be implemented by a baseband (BB) processor and / or another processor or 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 for storing a program and one or more processors capable of executing the program, and the one or more processors operate the reception processing unit 710 and the transmission processing unit 720. You may. The program may be a program for causing one or more of the above processors to execute the operations of the reception processing unit 710 and the transmission processing unit 720.

<3.5. Technical features>
Next, the 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 source base station (base station 600) of the handover of the terminal device 700, and relates to the measurement for the terminal device 700. Get a response message containing information about the uplink resource. 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).

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. You may.

Further, the base station 600 (first communication processing unit 610) includes the above information of the uplink resource regarding 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. Then, the base station 600 (second communication processing unit 620) transmits a handover command message including information corresponding to the information of the uplink resource related to the measurement for the terminal device 700 to the terminal device 700.

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 in the same manner as the first communication processing unit 241 of the first embodiment. It may operate in the same manner as 243.

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

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.

This makes it possible to save time, for example, for allocating a data channel (Data CH) in consideration of the terminal device immediately after the handover. Therefore, it is possible to quickly increase the throughput of the terminal device immediately after the handover.

<< 4. Other embodiments >>
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. It will be appreciated by those skilled in the art that these embodiments are merely exemplary and that various modifications are possible 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 performed in chronological order in the order described in the sequence diagram. For example, the steps in the process may be executed in a different order from the order described in the sequence diagram, or may be executed in parallel. In addition, 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 (or a plurality of devices) constituting the base station) including the components of the base station described in the present specification (for example, a first communication processing unit, a second communication processing unit, and / or an acquisition unit). One or more devices (or units) of (units), or modules for one of the plurality of devices (or units) described above) may be provided. A device (eg, a module for a terminal device) comprising the components of the terminal device described herein (eg, a receive processing unit and / or a transmission processing unit) may be provided. Further, a method including the processing of the above components may be provided, and a program for causing the processor to execute the processing of the above components may be provided. Further, a non-transitory computer readable medium may be provided which can be read by the computer on which the program is recorded. Of course, such devices, modules, methods, programs, and computer-readable non-temporary recording media are also included in the invention.

Some or all of the above embodiments may also be described, but not limited to:

(Appendix 1)
A response message to a handover message from the source base station of the handover of the terminal device, the acquisition unit for acquiring the response message including the information of the uplink resource related to the measurement for the terminal device, and the acquisition unit.
A device including a first communication processing unit that transmits the response message to the handover message to the source base station.

(Appendix 2)
The apparatus according to Appendix 1, wherein the information of the uplink resource relating to the measurement for the terminal device includes information relating to a resource for the terminal device to transmit measurement information.

(Appendix 3)
The apparatus according to Appendix 2, wherein the information of the uplink resource relating to the measurement for the terminal device includes information indicating a resource for the terminal device to transmit the measurement information.

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

(Appendix 5)
The device according to any one of Supplementary note 1 to 4, wherein the information of the uplink resource related to the measurement for the terminal device includes information about a resource for the terminal device to transmit an uplink reference signal. ..

(Appendix 6)
The apparatus according to Appendix 5, wherein the information of the uplink resource relating to the measurement for the terminal device includes information indicating a resource for the terminal device to transmit an uplink reference signal.

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

(Appendix 8)
The device according to any one of Supplementary note 1 to 7, wherein the information of the uplink resource related to the measurement for the terminal device is information transmitted from the source base station to the terminal device.

(Appendix 9)
The device according to Appendix 8, further comprising a second communication processing unit that receives a signal transmitted from the terminal device based on the information of the uplink resource related to the measurement for the terminal device.

(Appendix 10)
The first communication processing unit receives a handover message including beam-related information regarding the beam from the source base station, and receives the handover message.
The information in the uplink resource for the measurement for the terminal device is information about the uplink resource in the radio resource selected based on the beam-related information and is related to the measurement for the terminal device. The device according to any one of Supplementary note 1 to 8, which is information on the uplink resource.

(Appendix 11)
Further equipped with a second communication processing unit that transmits a beam using beamforming,
The device according to Appendix 10, wherein the beam-related information is information about a beam transmitted by the device using beamforming.

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

(Appendix 13)
The device according to any one of Supplementary note 10 to 12, wherein the beam-related information is information about one or more of a plurality of beams.

(Appendix 14)
The device according to Appendix 13, wherein the beam-related information is information indicating one or more of the plurality of beams.

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

(Appendix 16)
The device according to any one of Supplementary note 10 to 12, wherein the beam-related information is information indicating one or more sets of a plurality of sets of beamforming weights.

(Appendix 17)
The information on the uplink resource for the measurement for the terminal device is information on the uplink resource in the radio resource corresponding to one or more sets of beamforming weights selected based on the beam related information. The device according to Appendix 15 or 16, which is information on the uplink resource related to the measurement for the terminal device.

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

(Appendix 19)
The device is any one of Supplementary note 1 to 18, which is a base station, one or more devices among a plurality of devices constituting the base station, or a module for one of the plurality of devices. The device described in the section.

(Appendix 20)
A first communication processing unit that receives a response message including information on an uplink resource related to measurement for the terminal device, which is a response message to the handover message transmitted to the target base station for the handover of the terminal device.
A device comprising a second communication processing unit that transmits a handover command message including information corresponding to the information of the uplink resource related to the measurement for the terminal device to the terminal device.

(Appendix 21)
The apparatus according to Appendix 20, wherein the information of the uplink resource relating to the measurement for the terminal device includes information relating to a resource for the terminal device to transmit measurement information.

(Appendix 22)
21. The apparatus of Supplementary Note 21, wherein the information of the uplink resource relating to the measurement for the terminal device includes information indicating a resource for the terminal device to transmit measurement information.

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

(Appendix 24)
The device according to any one of Supplementary note 20 to 23, wherein the information of the uplink resource relating to the measurement for the terminal device includes information relating to a resource for the terminal device to transmit an uplink reference signal. ..

(Appendix 25)
23. The apparatus of Appendix 24, wherein the information of the uplink resource relating to the measurement for the terminal device includes information indicating a resource for the terminal device to transmit an uplink reference signal.

(Appendix 26)
The device according to Appendix 25, wherein the uplink reference signal is an SRS (Sounding Reference Signal).

(Appendix 27)
The second communication processing unit receives the first beam-related information regarding the beam from the terminal device, and receives the first beam-related information.
The first communication processing unit transmits a handover message including the second beam-related information corresponding to the first beam-related information to the target base station.
The information of the uplink resource relating to the measurement for the terminal device is information of the uplink resource in the radio resource selected based on the second beam related information and is for the terminal device. The device according to any one of the appendices 20 to 26, which is information on the uplink resource related to the measurement.

(Appendix 28)
The device according to Appendix 27, wherein the first beam-related information is information about a beam transmitted by the target base station using beamforming.

(Appendix 29)
The device according to Appendix 27 or 28, wherein the second beam-related information is the same information as the first beam-related information.

(Appendix 30)
The second communication processing unit receives the measurement report transmitted from the terminal device and receives the measurement report.
The measurement report includes the first beam-related information.
The device according to any one of Supplementary note 27 to 29.

(Appendix 31)
The device is any one of the appendices 20 to 30, which is a base station, one or more devices among a plurality of devices constituting the base station, or a module for one of the plurality of devices. The device described in the section.

(Appendix 32)
A reception processing unit that receives a handover command message including information on uplink resources related to measurement for the terminal device from the source base station of the handover of the terminal device.
A device comprising a transmission processing unit that transmits a signal to the target base station of the handover based on the information of the uplink resource related to the measurement for the terminal device.

(Appendix 33)
23. The apparatus of Appendix 32, wherein the information in the uplink resource for the measurement for the terminal device includes information about a resource for the terminal device to transmit measurement information.

(Appendix 34)
23. The apparatus of Appendix 33, wherein the information of the uplink resource relating to the measurement for the terminal device includes information indicating a resource for the terminal device to transmit measurement information.

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

(Appendix 36)
The device according to any one of Supplementary note 32 to 35, wherein the information of the uplink resource relating to the measurement for the terminal device includes information relating to a resource for the terminal device to transmit an uplink reference signal. ..

(Appendix 37)
13. The device of Appendix 36, wherein the information in the uplink resource for the measurement for the terminal device includes information indicating the resource for the terminal device to transmit an uplink reference signal.

(Appendix 38)
The device according to Appendix 37, wherein the uplink reference signal is an SRS (Sounding Reference Signal).

(Appendix 39)
The transmission processing unit transmits the first beam-related information regarding the beam to the source base station.
The information on the uplink resource for the measurement for the terminal device is information on the uplink resource in the radio resource selected based on the second beam-related information corresponding to the first beam-related information. The device according to any one of Supplementary note 32 to 38, which is information on the uplink resource related to the measurement for the terminal device.

(Appendix 40)
The device according to Appendix 39, wherein the first beam-related information is information about a beam transmitted by the target base station using beamforming.

(Appendix 41)
The transmission processing unit transmits the measurement report to the source base station, and the transmission processing unit transmits the measurement report to the source base station.
The device according to Appendix 39 or 40, wherein the measurement report contains the first beam-related information.

(Appendix 42)
The transmission processing unit is a radio resource selected based on the information of the uplink resource related to the measurement for the terminal device and based on the second beam-related information corresponding to the first beam-related information. The device according to any one of Supplementary note 39 to 41, which transmits a signal to the target base station of the handover by using the above.

(Appendix 43)
The device according to any one of Supplementary note 32 to 41, wherein the device is a terminal device or a module for the terminal device.

(Appendix 44)
Obtaining a response message that includes information on uplink resources related to measurement for the terminal device, which is a response message to the handover message from the source base station of the handover of the terminal device, and
A method comprising transmitting the response message to the handover message to the source base station.

(Appendix 45)
Receiving a response message to a handover message transmitted to the target base station for the handover of the terminal device, which includes information on the uplink resource related to the measurement for the terminal device.
A method comprising transmitting a handover command message including information corresponding to the information of the uplink resource for the measurement for the terminal device to the terminal device.

(Appendix 46)
Receiving a handover command message containing information on uplink resources related to the measurement for the terminal device from the source base station of the handover of the terminal device.
A method comprising transmitting a signal to a target base station of the handover based on the information of the uplink resource for the measurement for the terminal device.

(Appendix 47)
Obtaining a response message that includes information on uplink resources related to measurement for the terminal device, which is a response message to the handover message from the source base station of the handover of the terminal device, and
A program for causing a processor to transmit the response message to the handover message to the source base station.

(Appendix 48)
Receiving a response message to a handover message transmitted to the target base station for the handover of the terminal device, which includes information on the uplink resource related to the measurement for the terminal device.
A program for causing a processor to send a handover command message including information corresponding to the information of the uplink resource related to the measurement for the terminal device to the terminal device.

(Appendix 49)
Receiving a handover command message containing information on uplink resources related to the measurement for the terminal device from the source base station of the handover of the terminal device.
A program for causing a processor to transmit a signal to a target base station of the handover based on the information of the uplink resource for the measurement for the terminal device.

(Appendix 50)
Obtaining a response message that includes information on uplink resources related to measurement for the terminal device, which is a response message to the handover message from the source base station of the handover of the terminal device, and
A readable recording medium recording a program for transmitting the response message to the handover message to the source base station and causing the processor to execute the message.

(Appendix 51)
Receiving a response message to a handover message transmitted to the target base station for the handover of the terminal device, which includes information on the uplink resource related to the measurement for the terminal device.
A readable recording of a program for transmitting to the terminal device and causing the processor to execute a handover command message containing information corresponding to the information in the uplink resource for the measurement for the terminal device. recoding media.

(Appendix 52)
Receiving a handover command message containing information on uplink resources related to the measurement for the terminal device from the source base station of the handover of the terminal device.
A readable recording medium recording a program for causing a processor to transmit a signal to a target base station of the handover based on the information of the uplink resource for the measurement for the terminal device.

In the mobile communication system, the throughput of the terminal device immediately after the handover can be rapidly increased.

1, 2 System 100, 200, 500, 600 Base station 300, 700 Terminal equipment 141, 241 520, 610 First communication processing unit 143, 243, 620 Second communication processing unit 145, 510 Acquisition unit

Claims (10)

A response message to a handover message from the source base station of the handover of the terminal device, the acquisition unit for acquiring the response message including the information of the uplink resource related to the measurement for the terminal device, and the acquisition unit.
A device including a first communication processing unit that transmits the response message to the handover message to the source base station. The apparatus according to claim 1, wherein the information of the uplink resource relating to the measurement for the terminal device includes information relating to a resource for the terminal device to transmit measurement information. The device according to claim 2, wherein the measurement information is CSI (Channel State Information). The information according to any one of claims 1 to 3, wherein the information on the uplink resource for the measurement for the terminal device includes information on the resource for the terminal device to transmit an uplink reference signal. Device. The device according to claim 4, wherein the uplink reference signal is an SRS (Sounding Reference Signal). The device according to any one of claims 1 to 5, wherein the information of the uplink resource relating to the measurement for the terminal device is information transmitted from the source base station to the terminal device. The first communication processing unit receives a handover message including beam-related information regarding the beam from the source base station, and receives the handover message.
The information of the uplink resource for the measurement for the terminal device is information of the uplink resource in the radio resource selected based on the beam related information and is related to the measurement for the terminal device. The device according to any one of claims 1 to 6, which is information on the uplink resource. Further equipped with a second communication processing unit that transmits a beam using beamforming,
The device according to claim 7, wherein the beam-related information is information about a beam transmitted by the device using beamforming. The terminal is based on the information of the uplink resource for the measurement for the terminal device, using one or more sets of beamforming weights corresponding to the radio resource selected based on the beam related information. The device according to claim 7, further comprising a second communication processing unit that receives a signal transmitted from the device. The device according to any one of claims 7 to 9, wherein the beam-related information corresponds to beam-related information transmitted from the terminal device to the source base station.

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