JP2018011315A - Radio communication method, radio communication system, base station and radio terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication method capable of improving a communication performance in a radio terminal that executes multiple radio communications, by controlling interference within the radio terminal, a radio communication system, a base station and the radio terminal.SOLUTION: In accordance with a radio communication method, a radio terminal capable of executing multiple radio communications of different systems including a radio communication of a first system and a radio communication of any other system than the first system transmits to a base station auxiliary information including information indicating that occurrence of interference is detected in the radio communication of the first system and occurrence of interference is detected in the radio communication of the other system than the first system or occurrence of interference is detected in both the radio communication of the first system and the radio communication of the other system than the first system. From the base station that has received the auxiliary information from the radio terminal, the radio terminal receives a control signal including a radio parameter for enabling the interference in at least one of the multiple radio communications of the different systems to be suppressed.SELECTED DRAWING: Figure 6

Description

The present invention relates to a wireless communication method, a wireless communication system, a base station, and a wireless terminal.

In recent years, in order to further increase the speed and capacity of wireless communication in a wireless communication system such as a mobile phone system, the next generation wireless communication technology has been discussed. For example, 3GPP (3rd Generation Partnership Project), a standardization organization, proposes a communication standard called LTE (Long Term Evolution) and a communication standard called LTE-A (LTE-Advanced) based on LTE wireless communication technology. Has been.

In such a wireless communication system, for example, a plurality of wireless communications may be executed by one wireless terminal. The plurality of radio communications are, for example, different types of radio communications, such as LTE communications and a wireless LAN (Local Area Network). In this case, for example, a circuit corresponding to each of a plurality of wireless communications is provided in one wireless terminal. Such a situation is called, for example, IDC (In-device co-existence).

3GPP TR 36.816 V11.2.0 (2011-12)

In the wireless communication system as described above, it is assumed that each wireless communication performs communication using the same or close frequency band. At this time, in the wireless terminal, if each wireless communication is simultaneously executed by a corresponding circuit, mutual interference may occur in the wireless terminal and communication performance may be deteriorated.

The disclosed technology has been made in view of the above, and a wireless communication method and a wireless communication system capable of improving the communication performance by controlling interference in the wireless terminal in a wireless terminal that performs a plurality of wireless communications. An object of the present invention is to provide a base station and a wireless terminal.

According to an aspect of the present disclosure, the wireless communication method includes: a wireless terminal capable of performing wireless communication of a plurality of different methods including the wireless communication of the first method and the wireless communication of the second method; The occurrence of interference is detected in the wireless communication of the second method, the occurrence of interference is detected in the wireless communication of the second method, or interference occurs in both the wireless communication of the first method and the wireless communication of the second method. Auxiliary information including information indicating whether or not the occurrence of the occurrence is detected is transmitted to the base station, and the wireless terminal receives at least the plurality of different types of wireless communication from the base station that has received the auxiliary information from the wireless terminal. A control signal including a radio parameter capable of suppressing any interference is received.

According to one aspect of the wireless communication method disclosed in the present case, there is an effect that a wireless terminal that performs a plurality of wireless communications can control interference in the wireless terminal and improve communication performance.

FIG. 1 is a diagram illustrating a configuration of a wireless communication system according to the first embodiment. FIG. 2 is a functional block diagram showing the configuration of the base station according to the first embodiment. FIG. 3 is a functional block diagram showing the configuration of the wireless terminal according to the first embodiment. FIG. 4 is a diagram illustrating a hardware configuration of the base station according to the first embodiment. FIG. 5 is a diagram illustrating a hardware configuration of the wireless terminal according to the first embodiment. FIG. 6 is a sequence diagram for explaining the operation of the wireless communication system according to the first embodiment. FIG. 7 is a functional block diagram showing the configuration of the base station of the wireless communication system according to the second embodiment. FIG. 8 is a functional block diagram showing a configuration of a wireless terminal of the wireless communication system according to the second embodiment. FIG. 9 is a diagram illustrating an example of frequency band allocation in a wireless communication system. FIG. 10 is a diagram for explaining the operation of the wireless communication system according to the second embodiment. FIG. 11 is a diagram for explaining the operation of the wireless communication system according to the second embodiment. FIG. 12 is a sequence diagram for explaining the operation of the wireless communication system according to the second embodiment. FIG. 13 is a table showing an operation example of the wireless communication system according to the second embodiment. FIG. 14 is a table showing an operation example of the wireless communication system according to the third embodiment. FIG. 15 is a table showing an operation example of the wireless communication system according to the fourth embodiment. FIG. 16 is a table showing an operation example of the wireless communication system according to the fifth embodiment. FIG. 17 is a table showing an operation example of the wireless communication system according to the sixth embodiment. FIG. 18 is a table showing an operation example of the wireless communication system according to the seventh embodiment.

Hereinafter, embodiments of a wireless communication method, a wireless communication system, a base station, and a wireless terminal disclosed in the present application will be described with reference to the drawings. The wireless communication method, the wireless communication system, the base station, and the wireless terminal disclosed in the present application are not limited to the following embodiments.

[First Embodiment]
FIG. 1 shows a configuration of a wireless communication system 1 according to the first embodiment. As shown in FIG. 1, the wireless communication system 1 includes a base station 10 and a wireless terminal 20. The base station 10 forms a cell C10. The radio terminal 20 exists in the cell C10.

The base station 10 is connected to the network device 3 via a wired connection, and the network device 3 is connected to the network 2 via a wired connection. The base station 10 is provided so as to be able to transmit and receive data and control information to and from other base stations via the network device 3 and the network 2.

The network device 3 includes, for example, a communication unit and a control unit, and these components are connected so that signals and data can be input and output in one direction or in both directions. The network device 3 is realized by a gateway, for example. As a hardware configuration of the network device 3, for example, the communication unit is realized by an interface circuit, and the control unit is realized by a processor and a memory.

The radio terminal 20 communicates with the base station 10 by the first radio communication. Further, the wireless terminal 20 communicates with an access point other than the base station 10 and a communication device by the second wireless communication. Examples of the first wireless communication include LTE and LTE-A. Moreover, as 2nd wireless communication, WiFi and Bluetooth (trademark) are mentioned, for example.

The first wireless communication and the second wireless communication are performed using the same or close frequency band. For example, when the frequency band group prepared for the first wireless communication and the frequency band group prepared for the second wireless communication are adjacent to each other, or when the first wireless communication and the second wireless communication are the same frequency band group Is assumed to be shared.

FIG. 2 is a functional block diagram showing the configuration of the base station 10. As shown in FIG. 2, the base station 10 includes a transmission unit 11, a reception unit 12, and a control unit 13. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.

The transmission part 11 transmits a data signal and a control signal by 1st radio | wireless communication via an antenna. The antenna may be common for transmission and reception. The transmitter 11 transmits a downlink signal via, for example, a downlink data channel or a control channel. The downlink physical data channel includes, for example, a dedicated data channel PDSCH (Physical Downlink Shared Channel). The downlink physical control channel includes, for example, a dedicated control channel PDCCH (Physical Downlink Control Channel). The signal to be transmitted is, for example, an L1 / L2 control signal transmitted to the connected wireless terminal 20 on the dedicated control channel, or RRC (Radio Resource Control) control transmitted to the connected wireless terminal 20 on the dedicated data channel. Includes signal. The signal to be transmitted includes, for example, a reference signal used for channel estimation and demodulation. Further, the signal to be transmitted includes, for example, control information related to wireless communication at the connected wireless terminal 20. Examples of the control information include a scheduling period of radio resources used by the radio terminal 20 and a period of discontinuous reception (DRX) at the radio terminal 20.

The receiving unit 12 receives the data signal and the control signal transmitted from the wireless terminal 20 through the first wireless communication via the antenna. The receiving unit 12 receives an uplink signal via, for example, an uplink data channel or a control channel. The uplink physical data channel includes, for example, a dedicated data channel PUSCH (Physical Uplink Shared Channel). Also, the uplink physical control channel includes, for example, a dedicated control channel PUCCH (Physical Uplink Control Channel). The received signal includes, for example, a reference signal used for channel estimation and demodulation. The received signal includes, for example, interference notification (IDC indication) transmitted from the wireless terminal 20 and information (assistant information) that assists control of interference. For example, the interference notification notifies at least one of information indicating whether the occurrence of interference is detected and the interference level.

The control unit 13 acquires data and control information from the network device 3 and other base stations via a wired connection or a wireless connection. The control unit 13 outputs data to be transmitted and control information to the transmission unit 11. The control unit 13 inputs received data and control information from the reception unit 12.

In addition, the control unit 13 performs control to receive information for assisting interference control (first auxiliary information) from the wireless terminal 20 and transmit control information related to wireless communication to the wireless terminal 20. Information for assisting control of interference (first auxiliary information) is transmitted together with or included in the interference notification, for example. For example, when receiving information for assisting interference control, the control unit 13 determines a wireless communication parameter as control information related to wireless communication. For example, the wireless communication parameter is set to shorten the DRX cycle or to increase the scheduling frequency when increasing (activating) the first wireless communication. Further, for example, when the activity of the first wireless communication is lowered, the wireless communication parameter is set so that the DRX cycle is made longer or the scheduling frequency is lowered.

In addition, the control unit 13 receives information (second auxiliary information) for assisting interference control based on the measurement result for interference control from the wireless terminal 20, and transmits control information related to wireless communication to the wireless terminal 20. Control to send to. For example, when receiving information assisting control of interference received from the radio terminal 20, the control unit 13 determines radio communication parameters as control information related to radio communication. Examples of information that assists the control of interference include radio communication parameters (DRX pattern, handover destination frequency band, etc.) desired by the radio terminal 20 that are determined based on measurement results. The control unit 13 reflects the radio communication parameter desired by the radio terminal 20, performs scheduling, and transmits the radio communication parameter to the radio terminal 20. For example, the control unit 13 may receive the measurement result from the wireless terminal 20 and determine the wireless communication parameter. For example, the control unit 13 determines a DRX pattern and a handover destination frequency band based on the measurement result.

FIG. 3 is a functional block diagram showing the configuration of the wireless terminal 20. As illustrated in FIG. 3, the wireless terminal 20 includes transmission units 21A and 21B, reception units 22A and 22B, and control units 23A and 23B. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.

The transmitting unit 21A transmits a data signal and a control signal via the antenna through the first wireless communication. The antenna may be common for transmission and reception. The transmission unit 21 transmits an uplink signal via, for example, an uplink data channel or a control channel. The signal to be transmitted includes, for example, a reference signal for channel estimation and demodulation, an interference notification indicating the occurrence of interference, and information for assisting control of interference.

The receiving unit 22A receives the data signal and control signal transmitted from the base station 10 via the antenna through the first wireless communication. The received signal includes, for example, a reference signal for channel estimation and demodulation, and control information related to wireless communication.

The control unit 23A detects the occurrence of interference in the wireless terminal 20 due to the first wireless communication and the second wireless communication. For example, the control unit 23A detects the occurrence of interference in the first wireless communication based on the error characteristics of the received signal on the first wireless communication side when the first wireless communication and the second wireless communication are operating ( Alternatively, the deterioration of the communication performance in the first wireless communication is determined).

In addition, the control unit 23A acquires the detection result of the occurrence of interference in the second wireless communication (or the determination result of communication performance deterioration in the second wireless communication) notified from the control unit 23B. Note that the control unit 23A acquires the error characteristics of the received signal from the control unit 23B, and detects the occurrence of interference in the second wireless communication (or determines the deterioration in communication performance in the second wireless communication). It may be a thing.

Further, when detecting the occurrence of interference, the control unit 23A performs interference control for removing the interference. There are various types of interference control, which can be used in combination. As interference control, for example, a mode that is independently performed without cooperation between the first wireless communication side and the second wireless communication side of the wireless terminal 20, or the first wireless communication side and the second wireless communication side within the wireless terminal 20 And a mode performed in cooperation between the wireless terminal 20 and an external network such as the base station 10. For example, in the mode in which the wireless terminal 20 performs the cooperation, a method of taking a difference between the first wireless communication signal and the second wireless communication signal, the communication timing of the first wireless communication, and the communication timing of the second wireless communication And a method of reducing the transmission power of the first wireless communication or the second wireless communication.

Examples of interference control include (1) FDM (Frequency Division Multiplexing) system, (2) TDM (Time Division Multiplexing) system, and (3) Autonomous Denial system.

In the FDM system, the frequency band currently used in the first wireless communication is handed over to a different frequency band.

In the TDM system, control is performed so that one transmission is not performed simultaneously with the other reception in the first wireless communication and the second wireless communication. Specifically, for example, control is performed so that the DRX pattern of the first wireless communication becomes appropriate.

In the Autonomous Denial method, for example, when the interference in the wireless terminal cannot be controlled even if the FDM method and the TDM method are used, the wireless terminal 20 autonomously stops transmission of the first wireless communication or the second wireless communication. To do. For example, the frequency and level of the autonomous stop may be notified from the base station 10, or may be stored in advance or adjusted in the wireless terminal 20.

When detecting the occurrence of interference, the control unit 23A determines information for assisting the control of the interference. Then, the control unit 23 </ b> A performs control to transmit the interference notification and information for assisting interference control to the base station 10. Information for assisting control of interference includes, for example, information (intention information) indicating the orientation of the wireless terminal 20 for a plurality of wireless communications. The preference indicates, for example, which wireless communication priority is given to the wireless terminal 20 among a plurality of wireless communications. For example, in the case of the first wireless communication orientation, priority is given to the communication performance of the first wireless communication, and in the case of the second wireless communication orientation, priority is given to the communication performance of the second wireless communication. The intention information is transmitted, for example, as information of a predetermined bit added to the interference notification. In addition, the control unit 23A performs, for example, intention information, information that associates the intention information with the occurrence pattern of interference, and the intention information and the occurrence pattern of interference with the radio terminal 20 as information that assists control of interference. Information associated with the type of communication service (or the type of traffic) in the middle can be transmitted to the base station 10.

In addition, when detecting the occurrence of interference, the control unit 23A performs measurement processing for interference control. For example, the control unit 23A detects a reference signal from the base station 10 in a frequency band different from the currently used frequency band and measures the received signal level (different frequency measurement). The reception signal level includes, for example, reception power and reception quality. As the received signal level, for example, RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality) (= received power value / total power value), SIR (Signal to Interference Ratio), SINR (Signal to Interference and Noise Ratio). Etc.

Further, the control unit 23A receives control information related to wireless communication transmitted from the base station 10 in accordance with information assisting control of interference transmitted before completing the measurement process, and wireless communication is performed using this control information. Is performed to perform interference control. Further, the control unit 23A receives the control information related to wireless communication transmitted from the base station 10 according to the measurement result, and performs interference control by executing wireless communication using this control information.

The transmission unit 21B transmits the data signal and the control signal via the antenna through the second wireless communication. The antenna may be common for transmission and reception.

The receiving unit 22B receives the data signal and the control signal transmitted from the base station through the second wireless communication via the antenna.

The controller 23B outputs data to be transmitted and control information to the transmitter 21. In addition, the control unit 23 inputs data and control information received from the receiving unit 22.

For example, the control unit 23B detects the occurrence of interference in the second wireless communication based on the error characteristics of the received signal on the second wireless communication side when the first wireless communication and the second wireless communication are operating ( Alternatively, the deterioration of the communication performance in the second wireless communication is determined).

The control unit 23B notifies the measured reception signal level to the control unit 23A. The control unit 23B may determine deterioration of communication performance in the second wireless communication based on the measured received signal level and notify the determination result to the control unit 23A.

FIG. 4 is a diagram illustrating a hardware configuration of the base station 10. As shown in FIG. 4, the base station 10 includes, as hardware components, an RF (Radio Frequency) circuit 32 including an antenna 31, a CPU (Central Processing Unit) 33, a DSP (Digital Signal Processor) 34, and the like. , A memory 35 and a network IF (Interface) 36. The CPU is connected via a network IF 36 such as a switch so that various signals and data can be input and output. The memory 35 includes at least one of a RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), and a flash memory, and stores programs, control information, and data. The transmission unit 11 and the reception unit 12 are realized by the RF circuit 32 or the antenna 31 and the RF circuit 32, for example. The control unit 13 is realized by, for example, an integrated circuit such as the CPU 33 or an integrated circuit such as the DSP 34.

FIG. 5 is a diagram illustrating a hardware configuration of the wireless terminal 20. As illustrated in FIG. 5, the wireless terminal 20 includes, as hardware components, RF circuits 42A and 42B each including antennas 41A and 41B, CPUs 43A and 43B, and memories 44A and 44B, for example. Further, the wireless terminal 20 may include a display device such as an LCD (Liquid Crystal Display) connected to the CPUs 43A and 43B. The memories 44A and 44B include at least one of RAM such as SDRAM, ROM, and flash memory, for example, and store programs, control information, and data. The transmitting unit 21A and the receiving unit 22A are realized by, for example, the RF circuit 42A, or the antenna 41A and the RF circuit 42A. The control unit 23A is realized by an integrated circuit such as the CPU 43A, for example. Similarly, the transmission unit 21B and the reception unit 22B are realized by, for example, the RF circuit 42B, or the antenna 41B and the RF circuit 42B. The control unit 23B is realized by an integrated circuit such as a CPU 43B, for example.

Next, the operation of the wireless communication system 1 in the first embodiment will be described. FIG. 6 is a sequence diagram for explaining an interference control operation in the radio terminal 20 in the radio communication system 1.

Here, as a premise, the above-described three methods of interference control will be examined. In the FDM system, the execution of different frequency handover and the frequency of the handover destination are determined based on the measurement result of the different frequency measurement. This different frequency measurement requires, for example, several tens [ms] to several hundreds [ms]. For this reason, it takes time to perform handover from the currently used frequency band to a different frequency band. Therefore, it takes time for the interference control to function. Further, in the TDM system, it takes time to detect a DRX pattern appropriate for the interference control of the first wireless communication. That is, it takes time for the interference control to function. In addition, since the wireless terminal arbitrarily stops transmission in the Autonomous Denial scheme, for example, communication with a relatively high QoS (Quality of Service) may be stopped continuously, and communication performance deteriorates. In this way, rapid control is required so that deterioration in communication performance is avoided.

Note that although FIG. 5 illustrates an example in which two different wireless communication functions are implemented, the number is not limited to two, and three or more wireless communication functions may be implemented.

Therefore, in the first embodiment, the interference control operation is performed in the radio terminal 20 as follows.

As shown in FIG. 6, the radio terminal 20 detects the occurrence of interference (S1). Next, the radio terminal 20 determines information (first auxiliary information) for assisting interference control, and transmits an interference notification and information for assisting interference control to the base station 10 (S2). Information for assisting control of interference includes, for example, orientation information of the wireless terminal 20 for a plurality of wireless communications. Information for assisting control of interference is transmitted as, for example, an RRC control signal.

Next, the radio terminal 20 starts measurement processing for interference control (S3). In the measurement process, for example, the received signal level at a different frequency is measured.

At the same time, when receiving the first auxiliary information, the base station 10 determines control information (wireless communication parameters) related to wireless communication (S4). For example, a DRX cycle or a scheduling cycle is determined as a wireless communication parameter.

Next, the base station 10 transmits control information (wireless communication parameters) regarding the determined wireless communication to the wireless terminal 20 (S5). The radio communication parameter is transmitted as RRC signaling transmitted on the PDSCH, for example.

Next, the wireless terminal 20 controls wireless communication based on the received control information (wireless communication parameter) regarding wireless communication (S6). Thereby, the interference is controlled so as to remove the interference. Thus, before the different frequency measurement is completed, the interference control is started at an early stage according to the first auxiliary information, so that the interference control is quickly performed and the communication performance is improved.

Next, the wireless terminal 20 determines whether or not the measurement process is completed (S7). When the measurement process is not completed (No in S7), the process returns to S7, the measurement process is continued, and the determination is performed at a predetermined timing until the measurement process is completed.

On the other hand, when the measurement process is completed (No in S7), the wireless terminal 20 determines information (second auxiliary information) for assisting interference control based on the measurement result, and the base station 10 Send to.

Then, for example, when receiving the second auxiliary information based on the measurement result, the base station 10 determines control information (wireless communication parameters) related to wireless communication and transmits the control information to the wireless terminal 70. The wireless terminal 70 receives the received wireless communication. Wireless communication can be controlled based on the parameters. Thereby, for example, the interference is controlled so as to avoid the occurrence of interference by executing a different frequency handover, executing DRX with an appropriate DRX pattern, or executing an autonomous stop at an appropriate frequency. The Note that the wireless terminal 20 may not determine or transmit the second auxiliary information to the base station 10 when the predetermined condition is satisfied.

As described above, according to the first embodiment, the radio terminal 20 that performs a plurality of radio communications can control interference in the radio terminal 20 and improve communication performance.

In the above-described interference control operation, the wireless terminal 20 transmits the interference notification and the first auxiliary information to the base station 10 once after the occurrence of interference until the measurement process is completed. However, it is possible to repeatedly detect the occurrence of interference and transmit the interference notification and the first auxiliary information a plurality of times before the measurement process is completed. Further, the wireless terminal 20 includes a timer and a counter, and transmits the interference notification and the first auxiliary information, for example, until a predetermined time or a predetermined number of times after transmitting the first interference notification and the first auxiliary information. May be restricted. For example, the number of times of transmission (retransmission) is limited by an upper limit value N (N is an integer equal to or greater than 1), or control is performed so that transmission (retransmission) can be performed only during a period when the timer is counting. Thereby, it is possible to avoid excessive retransmission of the interference notification and the first auxiliary information. Note that the base station 10 may have a timer or a counter, and notify the wireless terminal 20 of the transmission restriction. Further, the radio terminal 20 may adjust the content of the first auxiliary information according to the elapsed time and the number of transmissions from the first transmission of the first auxiliary information, or according to the state of occurrence of interference. The content of the control information determined by the station 10 according to the first auxiliary information may be adjusted.

Further, the information for assisting the control of interference based on the measurement result is determined based on the partial measurement result and transmitted to the base station 10 when the measurement process is partially completed. good.

[Second Embodiment]
The wireless communication system according to the second embodiment includes a base station 50 (shown in FIG. 7 described later) and a wireless terminal 70 (shown in FIG. 8 described later). The overall configuration of the wireless communication system according to the second embodiment is the same as that of the wireless communication system 1 shown in FIG. Portions other than the base station 50 and the wireless terminal 70 in the wireless communication system are denoted by the same reference numerals and description thereof is omitted.

In the wireless communication system 1 according to the second embodiment, the wireless terminal 70 exists in a cell formed by the base station 50. The base station 50 is connected to the network device 3 via a wired connection, and the network device 3 is connected to the network 2 via a wired connection. The base station 50 is provided so as to be able to transmit and receive data and control information to and from other base stations via the network device 3 and the network 2.

The wireless terminal 70 communicates with the base station 50 by the first wireless communication. Further, the wireless terminal 70 communicates with an access point other than the base station 50 and a communication device by the second wireless communication. Examples of the first wireless communication include LTE and LTE-A. In addition, examples of the second wireless communication include WiFi and Bluetooth.

FIG. 7 is a functional block diagram showing the configuration of the base station 50. As shown in FIG. 7, the base station 50 includes a transmission / reception antenna 51, a transmission / reception switching unit 52, a reception signal processing unit 53, a data acquisition unit 54, an RS (Reference Signal) acquisition unit 55, Have The base station 50 includes a data transfer unit 56 and a wireless communication control unit 58. The base station 50 includes a data generation unit 59, an RS generation unit 60, and a transmission signal processing unit 61. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.

In the case of reception, the transmission / reception antenna 51 receives a radio signal and outputs it to the reception signal processing unit 53. The transmission / reception antenna 51 receives an uplink signal via, for example, an uplink data channel or a control channel. The physical channel that receives the signal includes, for example, a random access channel PRACH (Physical Random Access Channel), PUSCH, and PUCCH. The uplink signal includes, for example, a RACH signal transmitted from a wireless terminal in a random access procedure, a reference signal used for channel estimation and demodulation, a control signal, and a data signal. The control signal includes, for example, an interference notification transmitted from the wireless terminal 70, information for assisting interference control, and a measurement result for interference control.

The transmission / reception antenna 51 transmits a radio signal input from the transmission signal processing unit 61 in the case of transmission. The transmission / reception antenna 51 transmits a downlink signal via, for example, a downlink data channel or a control channel. Physical channels for transmitting signals include, for example, a synchronization channel PSCH (Physical Synchronization Channel), a broadcast channel PBCH (Physical Broadcast Channel), PDSCH, and PDCCH. The downlink signal includes a reference signal used for channel estimation and demodulation, a control signal, and a data signal. Examples of the control signal include L1 / L2 signaling transmitted on the dedicated wireless channel 70 to the connected wireless terminal 70 and RRC signaling transmitted on the dedicated data channel to the wireless terminal 70 in the connected state. Further, examples of the control signal include system information that is stored in a MIB (Master Information Block) or SIB (System Information Block) and transmitted on a broadcast channel or a shared channel designated by the broadcast channel. The control signal includes, for example, control information related to wireless communication at the currently connected wireless terminal 70. Examples of the control information include a scheduling cycle of radio resources used by the radio terminal 70 and a DRX cycle at the radio terminal 70. These pieces of control information are notified, for example, at a connection establishment timing or a predetermined control timing.

The transmission / reception switching unit 52 switches between transmission and reception of the transmission / reception antenna 51. The antenna may be separated for transmission and reception. Further, a plurality of antennas may be provided.

The reception signal processing unit 53 performs wireless processing such as A / D (Analog to Digital) conversion and digital signal processing such as FFT processing on the reception signal. The reception signal processing unit 53 outputs the received data signal and control signal to the data acquisition unit 54. In addition, the reception signal processing unit 53 outputs the received reference signal to the RS acquisition unit 55.

The data acquisition unit 54 performs demodulation processing and decoding processing on the received data signal and control signal. For example, the data acquisition unit 54 performs demodulation processing based on control information notified or stored in advance and a reference signal for demodulation processing. Further, the data acquisition unit 54 performs a decoding process on the demodulated signal based on the control information notified or stored in advance and the channel estimation value estimated from the reference signal for channel estimation. . In addition, the data acquisition unit 54 performs reordering processing of the decoded signal and acquires data.

The RS acquisition unit 55 outputs a reference signal for demodulation to the data acquisition unit 54. Further, the RS acquisition unit 55 outputs a channel estimation value estimated from control information notified or stored in advance and a reference signal for channel estimation to the data acquisition unit 54. In addition, the RS acquisition unit 55 outputs the reception signal level acquired from the reference signal to the wireless communication control unit 58.

The data transfer unit 56 transfers data and control information input from the data acquisition unit 54 to the network device 3. In addition, the data transfer unit 56 inputs data and control information transferred from the network device 3. In addition, the data transfer unit 56 outputs data to be transmitted and control information to the data generation unit 59.

The radio communication control unit 58 performs scheduling such as allocation of radio resources to the radio terminal 70. The wireless communication control unit 58 performs control to receive, for example, interference notification and information for assisting interference control (first auxiliary information) from the wireless terminal 70 and transmit control information related to wireless communication to the wireless terminal 70. For example, when receiving information for assisting interference control, the wireless communication control unit 58 determines a wireless communication parameter. For example, the wireless communication parameter is set to shorten the DRX cycle or to increase the scheduling frequency when increasing (activating) the first wireless communication. Further, for example, when the activity of the first wireless communication is lowered, the wireless communication parameter is set so that the DRX cycle is made longer or the scheduling frequency is lowered.

In addition, the wireless communication control unit 58 receives information (second auxiliary information) for assisting interference control from the wireless terminal 70 based on the measurement result for interference control, and wirelessly transmits control information related to wireless communication. Control to transmit to the terminal 70 is performed. For example, when receiving information for assisting control of interference received from the wireless terminal 70, the wireless communication control unit 58 determines the wireless communication parameter. Examples of the information that assists the control of interference include radio communication parameters desired by the radio terminal 70 (such as a DRX pattern and a handover destination frequency band) that are determined based on measurement results. The radio communication control unit 58 reflects the radio communication parameter desired by the radio terminal 20 and performs scheduling, and transmits the radio communication parameter to the radio terminal 70. For example, the control unit 13 may receive a measurement result from the wireless terminal 70 and determine a wireless communication parameter. For example, the wireless communication control unit 58 determines a DRX pattern and a handover destination frequency band based on the measurement result.

The data generation unit 59 stores user data and control information in a predetermined signaling format. Then, the data generation unit 59 performs encoding processing and modulation processing on user data and control information stored in the signaling format, and outputs transmission data to the transmission signal processing unit 60. The control information includes broadcast information.

The RS generation unit 60 generates a reference signal used for data demodulation and channel estimation and outputs the reference signal to the transmission signal processing unit 61.

The transmission signal processing unit 61 generates a transmission signal and outputs it to the transmission / reception antenna 51. The transmission signal processing unit 61 assigns antenna ports and radio resources for transmission data and reference signals, for example. In addition, the transmission signal processing unit 61 performs radio processing such as digital signal processing and D / A (Digital to Analog) conversion processing to generate a transmission signal.

FIG. 8 is a block diagram showing a functional configuration of the wireless terminal 70. As shown in FIG. 8, the radio terminal 70 includes a transmission / reception antenna 71, a transmission / reception switching unit 72, a received signal processing unit 73, a data acquisition unit 74, a first radio communication control unit 75, and interference. A detection unit 76, a data generation unit 77, a transmission signal processing unit 78, and an application processing unit 80 are included. The wireless terminal 70 includes a transmission / reception antenna 82, a transmission / reception switching unit 83, a reception signal processing unit 84, a data acquisition unit 85, a second wireless communication control unit 86, an interference detection unit 87, A data generation unit 88 and a transmission signal processing unit 89 are included. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.

In the case of reception, the transmission / reception antenna 71 receives a radio signal by the first radio communication and outputs it to the reception signal processing unit 73. The transmission / reception antenna 71 receives a downlink signal through, for example, a downlink data channel or a control channel. Physical channels that receive signals include, for example, PSCH, PBCH, PDSCH, and PDCCH. Downlink signals include, for example, PCH (Paging Channel) signals used for simultaneous calling of wireless terminals, reference signals used for channel estimation and demodulation, control signals, and data signals. Examples of the control signal include L1 / L2 signaling transmitted on the dedicated wireless channel 70 to the connected wireless terminal 70 and RRC signaling transmitted on the dedicated data channel to the wireless terminal 70 in the connected state. Further, the control signal includes, for example, control information related to wireless communication with the connected wireless terminal 70. Examples of the control information include a scheduling cycle of radio resources used by the radio terminal 70 and a DRX cycle at the radio terminal 70.

In the case of transmission, the transmission / reception antenna 71 transmits a wireless signal input from the transmission signal processing unit 78 by the first wireless communication. The transmission / reception antenna 71 transmits a downlink signal via, for example, a downlink data channel or a control channel. Physical channels that transmit signals include, for example, PRACH, PUSCH, and PUCCH. The uplink signal includes a RACH signal, a reference signal used for channel estimation and demodulation, a control signal, and a data signal. The control signal includes, for example, an interference notification transmitted from the wireless terminal 70, information for assisting interference control, and a measurement result for interference control.

The transmission / reception switching unit 72 switches between transmission and reception of the transmission / reception antenna 71. In the first wireless communication, the antenna may be separated for transmission and reception. The first wireless communication may include a plurality of antennas.

The reception signal processing unit 73 performs wireless processing such as A / D conversion and digital signal processing such as FFT processing on the reception signal. The reception signal processing unit 73 outputs the received data signal, control signal, reference signal, and PCH signal to the data acquisition unit 74.

The data acquisition unit 74 performs demodulation processing and decoding processing on the received data signal, control signal, and the like. For example, the data acquisition unit 74 performs demodulation processing based on control information notified or stored in advance and a reference signal for demodulation processing. Further, the data acquisition unit 74 performs a decoding process on the demodulated signal based on the control information notified or stored in advance and the channel estimation value estimated from the reference signal for channel estimation. . Further, the data acquisition unit 74 performs reordering processing or the like of the decoded received signal and extracts data and control information. The control information includes notification information, for example.

The interference detection unit 76 detects the occurrence of interference in the wireless terminal 70 due to the first wireless communication and the second wireless communication. For example, the interference detection unit 76 detects the occurrence of internal interference on the first wireless communication side. For example, the interference detection unit 76 detects the occurrence of interference in the first wireless communication based on the error characteristics of the received signal on the first wireless communication side when the first wireless communication and the second wireless communication are operating. (Alternatively, deterioration of communication performance in the first wireless communication is determined).

The first wireless communication control unit 75 controls wireless communication in the first wireless communication in accordance with the notified or previously stored control information. In addition, when the occurrence of interference is detected, the first wireless communication control unit 75 performs interference control for removing the interference. As interference control, for example, there are (1) FDM system, (2) TDM system, and (3) Autonomous Denial system, which can be used in combination.

When the occurrence of interference is detected, the first wireless communication control unit 75 determines information that assists in controlling the interference. Then, the first wireless communication control unit 75 performs control to transmit the interference notification and information for assisting interference control to the base station 50. Information for assisting control of interference includes, for example, information (intention information) indicating the orientation of the wireless terminal 70 for a plurality of wireless communications. The intention information is, for example, information indicating which of the plurality of wireless communications at the wireless terminal 70 is prioritized for communication performance. For example, in the case of the first wireless communication orientation, priority is given to the communication performance of the first wireless communication, and in the case of the second wireless communication orientation, priority is given to the communication performance of the second wireless communication. The intention information is transmitted as, for example, 1-bit information added to the interference notification.

Further, when the occurrence of interference is detected, the first wireless communication control unit 75 executes a measurement process for controlling the interference. For example, the first wireless communication control unit 75 detects a reference signal from the base station 50 in a frequency band different from the currently used frequency band, and measures the received signal level (different frequency measurement).

In addition, the first wireless communication control unit 75 executes wireless communication using control information related to wireless communication transmitted from the base station 50 in accordance with information assisting control of interference transmitted before completing the measurement process. By doing so, interference control is performed. This control information is, for example, a radio communication parameter such as a scheduling cycle of radio resources used by the radio terminal 70 and a DRX cycle in the radio terminal 70.

Further, the first wireless communication control unit 75 receives control information related to wireless communication transmitted from the base station 50 according to information assisting control of interference transmitted based on the measurement result, and uses this control information. By performing wireless communication, interference control is performed. This control information is, for example, a radio communication parameter such as a DRX pattern or a handover destination frequency band.

The application processing unit 80 manages various applications such as telephone calls and data communications executed by the wireless terminal 70. The application processing unit 80 causes the first wireless communication and the second wireless communication to be executed according to the application to be executed. In addition, the application processing unit 80 notifies the first wireless communication control unit 75 of a communication service such as a call or data communication, a QoS level, or the like according to the application to be executed. Further, the application processing unit 80 outputs user data to be transmitted to the data generation unit 77 and the data generation unit 88. In addition, the application processing unit 80 inputs the acquired reception data from the data acquisition unit 74 or the data acquisition unit 85.

The data generation unit 77 stores user data and control information in a predetermined signaling format. Then, the data generation unit 77 performs encoding processing and modulation processing on the user data and control information stored in the signaling format, and outputs them to the transmission signal processing unit 78. Further, the data generation unit 77 generates a reference signal used for data demodulation and channel estimation and outputs the reference signal to the transmission signal processing unit 78. Further, the data generation unit 77 generates a control signal and outputs it to the transmission signal processing unit 78.

The transmission signal processing unit 78 generates a transmission signal and outputs it to the transmission / reception antenna 71. The transmission signal processing unit 78 assigns antenna ports and radio resources for transmission data and reference signals, for example. In addition, the transmission signal processing unit 78 performs wireless processing such as digital signal processing and D / A (Digital to Analog) conversion processing to generate a transmission signal.

In the case of reception, the transmission / reception antenna 82 receives a radio signal by the second radio communication and outputs it to the reception signal processing unit 84. Further, in the case of transmission, the transmission / reception antenna 82 transmits a radio signal input from the transmission signal processing unit 89 by the second radio communication.

The transmission / reception switching unit 83 switches between transmission and reception of the transmission / reception antenna 82. In the second wireless communication, the antenna may be separated for transmission and reception. The second wireless communication may include a plurality of antennas.

The reception signal processing unit 84 performs wireless processing such as A / D conversion and digital signal processing such as FFT processing on the reception signal, and outputs the received data signal and control signal to the data acquisition unit 85.

The data acquisition unit 85 performs demodulation processing and decoding processing on the received data signal, control signal, and the like, and acquires data and control information.

The second wireless communication control unit 86 controls wireless communication in the second wireless communication in accordance with the notified or previously stored control information.

For example, the interference detector 87 detects the occurrence of internal interference on the second wireless communication side. For example, the interference detection unit 87 detects the occurrence of interference in the second wireless communication based on the error characteristics of the received signal on the second wireless communication side when the first wireless communication and the second wireless communication are operating. (Alternatively, the deterioration of communication performance in the second wireless communication is determined). The interference detection unit 87 outputs, for example, the error characteristics of the received signal on the second wireless communication side or the detection result of occurrence of interference to the interference detection unit 76.

The data generation unit 88 performs encoding processing and modulation processing on user data and control information, and outputs the result to the transmission signal processing unit 89.

The transmission signal processing unit 89 performs wireless processing such as digital signal processing and D / A (Digital to Analog) conversion processing, for example, generates a transmission signal, and outputs the transmission signal to the transmission / reception antenna 82.

The hardware configuration of the base station 50 is the same as the hardware configuration of the base station 10 of the first embodiment. The radio processing function of the transmission / reception antenna 51, the transmission / reception switching unit 52, the reception signal processing unit 53, and the radio processing function of the transmission signal processing unit 61 of the base station 50 are realized by, for example, an antenna and an RF circuit. The In addition, the digital signal processing function of the reception signal processing unit 53 of the base station 50, the digital signal processing function of the transmission signal processing unit 61, the data acquisition unit 54, the RS acquisition unit 55, the data transfer unit 56, and wireless communication The control unit 58, the data generation unit 59, and the RS generation unit 60 are realized by an integrated circuit such as a CPU, for example.

The hardware configuration of the wireless terminal 70 is the same as the hardware configuration of the wireless terminal 20 of the first embodiment. The radio processing function of the transmission / reception antenna 71, the transmission / reception switching unit 72, the reception signal processing unit 73, and the radio processing function of the transmission signal processing unit 89 of the wireless terminal 70 are realized by, for example, an antenna and an RF circuit. The Digital signal processing function of reception signal processing unit 73 of wireless terminal 70, digital signal processing function of transmission signal processing unit 89, data acquisition unit 74, first wireless communication control unit 75, interference detection unit 76, data The generation unit 77, the application processing unit 80, the data acquisition unit 85, the second wireless communication control unit 86, the interference detection unit 87, and the data generation unit 88 are realized by an integrated circuit such as a CPU, for example.

Next, the operation of the wireless communication system in the second embodiment will be described. FIG. 12 is a sequence diagram for explaining the interference control operation of the wireless terminal 70 in the wireless communication system.

Here, FIG. 9 shows an example of frequency bands prepared for the first wireless communication and the second wireless communication. The first wireless communication and the second wireless communication are performed using the same or close frequency band. For example, when the frequency band group prepared for the first wireless communication and the frequency band group prepared for the second wireless communication are adjacent to each other, or when the first wireless communication and the second wireless communication are the same frequency band group Is assumed to be shared. For example, ISM (Industry Science Medical) Band (2400 to 2483.5 MHz) is one of non-licensed bands and is used in Bluetooth and WiFi. At this time, Band 40 (2300-2400MHz) prepared for LTE-A TDD Mode and Band 7 (2500-2570MHz) prepared for LTE-A UL FDD Mode are the frequency band groups adjacent to ISM Band. Become. Furthermore, when the ISM Band is also shared by LTE-A, the same frequency band can be used for LTE-A and Bluetooth or WiFi.

Next, FIG. 10 schematically shows a normal interference control operation as a comparative example. In FIG. 10, the horizontal axis indicates time. At time (a), the first wireless communication is ON and the second wireless communication is OFF, and no interference occurs. At time (b), the first wireless communication is turned on and the second wireless communication is turned on, occurrence of interference is detected, an interference notification is transmitted from the wireless terminal to the base station, and different frequency measurement is started at the wireless terminal. . At the time (c) and the time (d), the different frequency measurement is being executed, and the state where the interference has occurred continues. At time (e), the different frequency measurement is completed, and auxiliary information that assists interference control based on the measurement result is transmitted from the wireless terminal to the base station. The auxiliary information is, for example, a desired wireless communication parameter, such as different frequency information used in the FDM system, a DRX pattern used in the TDM system, and the like. At this time (e), the state where the interference still occurs is continued. In the base station, when the auxiliary information is received, the wireless communication parameter is determined, and the wireless communication parameter is transmitted from the base station to the wireless terminal, and interference control is started by the FMD method or the TDM method. Thus, at time (f), no interference occurs. In this example, the state in which interference occurs during measurement continues, and it takes time for the interference control to function.

On the other hand, FIG. 11 schematically shows the interference control operation of the wireless terminal 70 of the second embodiment. In FIG. 11, the horizontal axis represents time. At time (a), the first wireless communication is ON and the second wireless communication is OFF, and no interference occurs. At time (b), the first wireless communication is turned on and the second wireless communication is turned on, and the occurrence of interference is detected. At this time, the wireless terminal 70 transmits the first auxiliary information that assists the control of interference together with the interference notification to the base station 50. Then, different frequency measurement is started at the wireless terminal 70. The first auxiliary information includes, for example, orientation information indicating which communication performance of the first wireless communication or the second wireless communication is prioritized, and the base station 50 performs wireless communication for interference control according to this information. The parameters can be determined, and the wireless communication parameters are transmitted from the base station 50 to the wireless terminal 70, and interference control is started. At time (c) and time (d), different frequency measurement is being performed, but since interference control has been started early, interference is reduced or avoided. At time (e), the different frequency measurement is completed, and second auxiliary information for assisting the interference control based on the measurement result is transmitted from the wireless terminal to the base station. The second auxiliary information is, for example, a desired wireless communication parameter, such as different frequency information used in the FDM system, a DRX pattern used in the TDM system, and the like. At this time (e), the state where the interference is reduced continues. When receiving the second auxiliary information, the base station 50 determines the radio communication parameter, transmits the radio communication parameter to the radio terminal 70 from the base station, and performs interference control by the FMD scheme or the TDM scheme. Thus, at time (f), no interference occurs. In this example, since the interference control is started early even during measurement, the interference is reduced or avoided, and the communication performance is improved.

In the example of FIG. 11, the first auxiliary information includes, for example, the different frequency used in the FDM system in addition to the orientation information indicating which communication performance of the first wireless communication or the second wireless communication is prioritized. Information including information and DRX patterns used in the TDM method can be used. This is because, for example, when the wireless terminal 70 transmits the first auxiliary information and the measurement result has already been obtained (for example, the measurement process is performed at a relatively close timing in connection with control other than interference control). This can be applied to the case where a crack measurement result is obtained. Then, the second control information can be information including different frequency information used in the FDM method reflecting the measurement result obtained in the subsequent measurement process, a DRX pattern used in the TDM method, and the like. Here, if the orientation information of the wireless terminal 70 has changed since the time when the first auxiliary information was transmitted, the updated orientation information can be included in the second auxiliary information. That is, the second auxiliary information can be information obtained by updating the first auxiliary information.

Returning to FIG. 12, the interference control operation of the wireless terminal 70 in the wireless communication system in the second embodiment will be described in detail. As a premise, LTE communication (LTE or LTE-A) is used as the first wireless communication, and ISM communication (WiFi or Bluetooth) is used as the second wireless communication. Further, default values of control information (wireless communication parameters) related to wireless communication are notified in advance from the base station 50 at, for example, connection establishment timing, or stored in advance in the wireless terminal 70.

As illustrated in FIG. 12, the wireless terminal 70 performs processing for detecting the occurrence of interference (S21). Next, the wireless terminal 70 determines the occurrence of interference (deterioration of communication performance) (S22), and when the occurrence of interference is not detected (the determination result of S22 is No), returns to S21 and causes interference at a predetermined timing. Repeat detection. On the other hand, when the occurrence of interference is detected (the determination result in S22 is Yes), the wireless terminal 70 determines information (first auxiliary information) that assists the interference control, and assists the interference notification and the interference control. Information to be transmitted to the base station 50 (S23). This transmission is performed by RRC signaling, for example. The first auxiliary information includes orientation information of the wireless terminal 70 for a plurality of wireless communications.

Specifically, the table (a) in FIG. 13 shows a setting example of first auxiliary information, and the table (b) in FIG. 13 shows a setting example of wireless communication parameters based on the first auxiliary information in (a). . In FIG. 13, “Both interference” indicates that the occurrence of interference (deterioration in communication performance) is detected in both LTE communication and ISM communication, and “LTE only deterioration” indicates the occurrence of interference in LTE communication (communication performance). "Deterioration of ISM" indicates that the occurrence of interference (deterioration of communication performance) is detected in ISM communication. “LTE communication oriented” indicates that the wireless terminal 70 is oriented to LTE communication (prioritizing LTE communication performance), and “ISM communication oriented” is directed to the ISM communication (ISM communication oriented). (Priority is given to communication performance).

In the example of FIG. 13, information in which intention information is associated with an occurrence pattern of interference is transmitted as the first auxiliary information. Specifically, in the case of “LTE communication orientation” and “Both interference” or “LTE only deteriorated”, the first auxiliary information X = 1 is set. Further, in the case of “ISM communication orientation”, “both interference” or “degradation of only ISM”, the first auxiliary information X = 0 is set. Also, in the case of “LTE communication-oriented” and “ISM-only degradation”, or “ISM communication-oriented” and “LTE-only degradation”, the first auxiliary information is not transmitted.

In the example of FIG. 13, the first auxiliary information is 1-bit control information, which is transmitted in addition to the interference notification. At this time, the first auxiliary information may be transmitted only when a predetermined condition is satisfied. Examples of the predetermined condition include a case where there is first auxiliary information to be transmitted and a case where communication performance of at least one of a plurality of wireless communications is deteriorated.

Next, the wireless terminal 70 starts measurement processing for interference control (S24). In the measurement process, for example, the received signal level at a different frequency is measured.

At the same time, when receiving the first auxiliary information, the base station 50 determines the wireless communication parameters (S25). For example, a DRX cycle or a scheduling cycle is determined as a wireless communication parameter. With this wireless communication parameter, for example, the frequency of downlink reception, the frequency of corresponding uplink transmission (for example, transmission of ACK (ACKnowledgement) / NACK (Negative ACKnowledgement), etc.), the reception interval of downlink retransmission, and the position where DRX starts Is adjusted.

Specifically, as illustrated in the table (b) of FIG. 13, the base station 50 determines that the first auxiliary information X = 1 (“LTE communication orientation”, “Both interference” or “LTE only degradation”). "), Wireless communication parameters are determined so as to increase the activity of LTE communication. For example, when the activity of LTE communication is increased (activated), the radio communication parameter is set to shorten the DRX cycle or to increase the scheduling frequency.

In addition, when the first auxiliary information X = 0 (“ISM communication-oriented”, “bidirectional interference” or “degraded only by ISM”), the base station 50 determines wireless communication parameters so as to reduce the activity of LTE communication. To do. For example, when reducing the activity of LTE communication, the wireless communication parameter is set so as to make the DRX cycle longer or set the scheduling frequency lower.

Next, the base station 50 transmits the determined wireless communication parameter to the wireless terminal 70 (S26). The wireless communication parameter is transmitted using RRC signaling transmitted on the PDSCH, for example.

Next, the wireless terminal 70 controls communication based on the received wireless communication parameters (S27). Thereby, the interference is controlled so as to reduce or avoid the interference. Thus, before the different frequency measurement is completed, the interference control is started at an early stage according to the first auxiliary information, so that the interference control is quickly performed and the communication performance is improved.

More specifically, when the wireless terminal 70 is oriented to LTE communication, the LTE communication is increased by controlling the LTE communication so as to shorten the DRX cycle or increase the scheduling frequency. In addition, when the wireless terminal 70 is oriented to ISM communication, the LTE communication activity is decreased by controlling the LTE communication so as to lengthen the DRX cycle or decrease the scheduling frequency. Will increase the activity. By making the difference in activity through such communication control, interference is reduced or avoided and communication performance is improved at least for communication intended (prioritized) by the wireless terminal 70.

Next, the wireless terminal 70 determines whether or not the measurement process has been completed (S28). If the measurement process has not been completed (No in S28), the measurement process is continued and a determination is made at a predetermined timing until the measurement process is completed.

On the other hand, when the measurement process is completed (No in S28), the wireless terminal 70 determines information (second auxiliary information) for assisting interference control based on the measurement result, and the base station 50 (S29). The second auxiliary information is, for example, a wireless communication parameter desired by the wireless terminal 70 that is determined based on the measurement result. The wireless communication parameters desired by the wireless terminal 70 include, for example, different frequency information used in the FDM method (such as a frequency band of a handover destination), a DRX pattern used in the TDM method, and an autonomous stop used in the Auto denial method. Such as frequency.

Next, when receiving the second auxiliary information, the base station 50 determines wireless communication parameters (S30). For example, as a radio communication parameter, a DRX pattern, a frequency band of a different frequency handover destination, and the like are determined.

Next, the base station 50 transmits the determined wireless communication parameter to the wireless terminal 70 (S31). The wireless communication parameter is transmitted using RRC signaling transmitted on the PDSCH, for example.

Next, the wireless terminal 70 controls communication based on the received wireless communication parameter (S32). Thereby, interference is controlled so as to avoid occurrence of interference. Specifically, the occurrence of interference is avoided by executing a different frequency handover, executing DRX with an appropriate DRX pattern, or executing an autonomous stop at an appropriate frequency.

As described above, according to the second embodiment, the radio terminal 70 that performs a plurality of radio communications can control interference in the radio terminal 70 and improve communication performance.

[Third Embodiment]
Next, a radio communication system according to the third embodiment will be described. The overall configuration of the wireless communication system according to the third embodiment is the same as the configuration of the wireless communication system according to the second embodiment. In the following description, the same reference numerals are given and the description is omitted.

The third embodiment is different from the second embodiment in the operation related to the determination of the first auxiliary information and the determination of the wireless communication parameter according to the first auxiliary information. FIG. 14 is a table showing an operation example of the wireless communication system according to the third embodiment.

The wireless terminal according to the third embodiment is different from the wireless terminal 70 according to the second embodiment in operations related to the first wireless communication control unit 75.

In the third embodiment, when the occurrence of interference is detected, the first wireless communication control unit 75 determines information (first auxiliary information) that assists in controlling the interference. Then, the first wireless communication control unit 75 performs control to transmit the interference notification and information for assisting interference control to the base station 50. Information for assisting control of interference includes, for example, information (intention information) indicating the orientation of the wireless terminal 70 for a plurality of wireless communications. At this time, information associating the intention information with the interference occurrence pattern is transmitted as the first auxiliary information so that all combinations are distinguished.

Specifically, the table (a) of FIG. 14 shows a setting example of the first auxiliary information, and the table (b) of FIG. 14 shows a setting example of the wireless communication parameters based on the first auxiliary information of (a). . In FIG. 14, “Both interference” indicates that the occurrence of interference (deterioration in communication performance) is detected in both LTE communication and ISM communication, and “LTE only deterioration” indicates the occurrence of interference in LTE communication (communication performance). "Deterioration of ISM" indicates that the occurrence of interference (deterioration of communication performance) is detected in ISM communication. “LTE communication oriented” indicates that the wireless terminal 70 is oriented to LTE communication (prioritizing LTE communication performance), and “ISM communication oriented” is directed to the ISM communication (ISM communication oriented). (Priority is given to communication performance).

In the example of FIG. 14, as the first auxiliary information, six types of information in which the intention information and the interference occurrence pattern are associated with each other are transmitted as 3-bit control information in addition to the interference notification.

Other configurations of the radio terminal according to the third embodiment are the same as the configurations of the radio terminal 70 of the second embodiment. The hardware configuration of the wireless terminal according to the third embodiment is the same as the hardware configuration of the wireless terminal 70 of the second embodiment.

The base station according to the third embodiment is different from the base station 50 according to the second embodiment in operations related to the wireless communication control unit 58.

In the third embodiment, the wireless communication control unit 58 receives interference notification and information for assisting interference control (first auxiliary information) from the wireless terminal 70 and transmits control information related to wireless communication to the wireless terminal 70. Control. For example, when receiving information for assisting interference control, the wireless communication control unit 58 determines a wireless communication parameter.

In this case, specifically, as illustrated in the table (b) of FIG. 14, the base station 50 has at least the first auxiliary information X = 000 (“LTE communication orientation” and “two-way interference”). The wireless communication parameters are determined so as to maintain the current wireless communication parameter settings or increase the activity of LTE communication.

When the first auxiliary information X = 010 (“LTE communication orientation” and “LTE only deteriorated”), the base station 50 determines the radio communication parameters so as to increase the activity of LTE communication. At this time, the activity may be increased more than in the case of the first auxiliary information X = 000, 011.

When the first auxiliary information X = 100 (“LTE communication-oriented” and “ISM only deteriorated”), the base station 50 maintains at least the current wireless communication parameter setting or reduces the activity of LTE communication. Determine wireless communication parameters.

When the first auxiliary information X = 001 (“ISM communication-oriented” and “two-way interference”), the base station 50 maintains at least the current wireless communication parameter setting or wirelessly reduces the LTE communication activity. Determine communication parameters.

When the first auxiliary information X = 011 (“ISM communication-oriented” and “LTE only deteriorated”), the base station 50 holds at least the current wireless communication parameter setting or increases the activity of LTE communication. Determine wireless communication parameters.

When the first auxiliary information X = 101 (“ISM communication orientation” and “ISM only deteriorates”), the base station 50 determines wireless communication parameters so as to reduce the LTE communication activity. At this time, the activity may be increased more than in the case of the first auxiliary information X = 100, 001.

For example, when the activity of LTE communication is increased (activated), the radio communication parameter is set to shorten the DRX cycle or to increase the scheduling frequency. Further, for example, when lowering the LTE communication activity, the wireless communication parameter is set so as to make the DRX cycle longer or set the scheduling frequency lower.

For example, when the information indicating the interference level is included in the interference notification, whether to maintain the current setting or change the LTE communication activity in the above example may be determined according to the interference level. Good.

Other configurations of the base station according to the third embodiment are the same as the configurations of the base station 50 of the second embodiment. The hardware configuration of the base station according to the third embodiment is the same as the hardware configuration of the base station 50 according to the second embodiment.

Next, the operation of the wireless communication system in the third embodiment will be described. In the third embodiment, similarly to S23 of the second embodiment, the first auxiliary information is determined as illustrated in FIG. 14 and transmitted to the base station 50 together with the interference notification. And similarly to S25 of 2nd Embodiment, the base station 50 will determine a radio | wireless communication parameter, if 1st auxiliary information is received. And similarly to S27 of 2nd Embodiment, the radio | wireless terminal 70 controls communication based on the received radio | wireless communication parameter. Thereby, the interference is controlled so as to reduce or avoid the interference. Thus, before the different frequency measurement is completed, the interference control is started at an early stage according to the first auxiliary information, so that the interference control is quickly performed and the communication performance is improved.

Further, by performing communication control using the wireless communication parameters determined as described above, the activity and priority of the intended wireless communication or wireless communication service are relatively increased. Specifically, when the wireless terminal 70 is oriented to LTE communication, the LTE communication is increased by controlling the LTE communication so as to shorten the DRX cycle or increase the scheduling frequency. In addition, when the wireless terminal 70 is oriented to ISM communication, the LTE communication activity is decreased by controlling the LTE communication so as to lengthen the DRX cycle or decrease the scheduling frequency. Will increase the activity. By making the difference in activity through such communication control, interference is reduced or avoided and communication performance is improved at least for communication intended (prioritized) by the wireless terminal 70.

At this time, since the six types of information in which the intention information and the interference occurrence pattern are associated with each other are notified in a distinguishable manner, more detailed scheduling is performed based on the six types of information, and an appropriate wireless communication is performed. Communication parameters can be determined.

As described above, according to the third embodiment, a radio terminal that performs a plurality of radio communications can control interference in the radio terminal and improve communication performance.

[Fourth Embodiment]
Next, a radio communication system according to the fourth embodiment will be described. The overall configuration of the wireless communication system according to the fourth embodiment is the same as the configuration of the wireless communication system according to the second embodiment. In the following description, the same reference numerals are given and the description is omitted.

The fourth embodiment is different from the second embodiment in the operation related to the determination of the first auxiliary information and the determination of the wireless communication parameter corresponding to the first auxiliary information. FIG. 15 is a table showing an operation example of the wireless communication system according to the fourth embodiment.

The wireless terminal according to the fourth embodiment differs from the wireless terminal 70 according to the second embodiment in the operation relating to the first wireless communication control unit 75.

In the fourth embodiment, when the occurrence of interference is detected, the first wireless communication control unit 75 determines information (first auxiliary information) that assists in controlling the interference. Then, the first wireless communication control unit 75 performs control to transmit the interference notification and information for assisting interference control to the base station 50. Information for assisting control of interference includes, for example, information (intention information) indicating the orientation of the wireless terminal 70 for a plurality of wireless communications. At this time, the orientation information includes, for example, information indicating which of the plurality of communication services has priority when there is a plurality of communication services in any one of the plurality of wireless communications. Specifically, the intention information is, for example, information indicating which wireless communication priority is given to the communication performance between the VoIP (Voice of IP) communication service and the Data communication service in LTE communication. For example, in the case of LTE VoIP communication-oriented, the communication performance of LTE VoIP communication is given priority. In the case of LTE VoIP communication-oriented + LTE Data communication-oriented, the communication performance of both LTE VoIP communication and LTE Data communication is given priority over other communication. .

That is, when a plurality of communication services are included for each of a plurality of wireless communications, the traffic characteristics (pattern) of each communication service of the wireless communication may be known or assumed. For example, in LTE communication, when a VoIP communication service is performed, the arrival of traffic is periodic (for example, 20 [ms]). In such a case, for example, the base station 50 is notified of the intention for each communication service, and the base station 50 performs appropriate interference control by determining radio communication parameters so as to eliminate interference for each communication service. be able to.

Instead of notifying the “LTE VoIP communication-oriented” and “LTE Data communication-oriented” information as the oriented information, the information “RLC UM-oriented” and “RLC UM-oriented” may be notified. For example, when LTE VoIP communication is performed by RLC UM and LTE Data communication is performed by RLC AM, if LTE VoIP communication is oriented, the information of “RLC UM orientation” is notified, and LTE VoIP communication and LTE Data communication are performed. If both are oriented, the information “RLC UM orientation + RLC AM orientation” can be notified.

Further, instead of notifying the information “LTE VoIP communication-oriented” and “LTE Data communication-oriented” as the intention information, the information “real-time communication-oriented” and “non-real-time communication-oriented” may be notified. For example, if you are interested in LTE VoIP communication, notify “Real-time communication-oriented” information, and if you are interested in both LTE VoIP communication and LTE Data communication, “Real-time communication-oriented + non-real-time communication-oriented” Information can be notified.

Specifically, the table (a) in FIG. 15 shows a setting example of first auxiliary information, and the table (b) in FIG. 15 shows a setting example of wireless communication parameters based on the first auxiliary information in (a). . In FIG. 15, “Both interference” indicates that the occurrence of interference (deterioration in communication performance) is detected in both LTE communication and ISM communication, and “LTE only deterioration” indicates the occurrence of interference in LTE communication (communication performance). "Deterioration of ISM" indicates that the occurrence of interference (deterioration of communication performance) is detected in ISM communication. “LTE VoIP communication oriented” indicates that the wireless terminal 70 is oriented to VoIP communication service in LTE communication (LTE VoIP communication oriented communication priority), and “LTE VoIP communication oriented + LTE Data communication oriented” is a wireless terminal. 70 indicates that both the VoIP communication service and the Data communication service in LTE communication are oriented (prioritizing both communication performances).

In the example of FIG. 15, information in which intention information is associated with an occurrence pattern of interference is transmitted as the first auxiliary information. In the example of FIG. 15, the first auxiliary information is 1-bit control information, which is transmitted in addition to the interference notification. Specifically, in the case of “LTE VoIP communication orientation” and “two-way interference” or “deterioration of LTE only”, the first auxiliary information X = 0 is set. Further, in the case of “LTE VoIP communication-oriented + LTE Data communication-oriented” and “two-way interference” or “degrading only LTE”, the first auxiliary information X = 1 is set. Further, in the case of “deterioration of only ISM”, the first auxiliary information is not transmitted.

Other configurations of the radio terminal according to the fourth embodiment are the same as the configurations of the radio terminal 70 of the second embodiment. The hardware configuration of the wireless terminal according to the fourth embodiment is the same as the hardware configuration of the wireless terminal 70 of the second embodiment.

The base station according to the fourth embodiment is different from the base station 50 according to the second embodiment in operations related to the wireless communication control unit 58.

In the fourth embodiment, the wireless communication control unit 58 receives interference notification and information for assisting interference control (first auxiliary information) from the wireless terminal 70 and transmits control information related to wireless communication to the wireless terminal 70. Control. For example, when receiving information for assisting interference control, the wireless communication control unit 58 determines a wireless communication parameter.

At this time, specifically, as illustrated in the table (b) of FIG. 15, when the first auxiliary information X = 0 (“LTE VoIP communication orientation”, “Both interference” or “ "LTE only deteriorated") If LTE VoIP communication is in progress, the LTE VoIP settings will be retained, and if other communications are being performed at the same time, the priority of other communications will be lowered. decide.

When the first auxiliary information X = 1 (“LTE VoIP communication-oriented + LTE Data communication-oriented”, “two-way interference” or “degrading only LTE”), LTE base station 50 is performing LTE VoIP communication. The VoIP communication settings are retained, and when other communication is being performed at the same time, wireless communication parameters are determined so as to increase the activity of LTE Data communication.

For example, when the activity of LTE communication is increased (activated), the radio communication parameter is set to shorten the DRX cycle or to increase the scheduling frequency. Further, for example, when lowering the LTE communication activity, the wireless communication parameter is set so as to make the DRX cycle longer or set the scheduling frequency lower.

For example, when the information indicating the interference level is included in the interference notification, the amount of lowering the priority and the amount of increasing the activity may be determined according to the interference level in the above example.

Other configurations of the base station according to the fourth embodiment are the same as the configurations of the base station 50 according to the second embodiment. The hardware configuration of the base station according to the fourth embodiment is the same as the hardware configuration of the base station 50 according to the second embodiment.

Next, the operation of the wireless communication system in the fourth embodiment will be described. In the fourth embodiment, similarly to S23 of the second embodiment, the first auxiliary information is determined as illustrated in FIG. 15 and transmitted to the base station 50 together with the interference notification. And similarly to S25 of 2nd Embodiment, the base station 50 will determine a radio | wireless communication parameter, if 1st auxiliary information is received. And similarly to S27 of 2nd Embodiment, the radio | wireless terminal 70 controls communication based on the received radio | wireless communication parameter. Thereby, the interference is controlled so as to reduce or avoid the interference. Thus, before the different frequency measurement is completed, the interference control is started at an early stage according to the first auxiliary information, so that the interference control is quickly performed and the communication performance is improved.

Further, by performing communication control using the wireless communication parameters determined as described above, the activity and priority of the intended wireless communication or wireless communication service are relatively increased. By making the difference in activity through such communication control, interference is reduced or avoided and communication performance is improved at least for communication intended (prioritized) by the wireless terminal 70.

As described above, according to the fourth embodiment, a wireless terminal that performs a plurality of wireless communications can control interference in the wireless terminal and improve communication performance.

[Fifth Embodiment]
Next, a radio communication system according to the fifth embodiment will be described. The overall configuration of the wireless communication system according to the fifth embodiment is the same as the configuration of the wireless communication system according to the second embodiment. The fifth embodiment is different from the second embodiment in operations related to determination of first auxiliary information and determination of wireless communication parameters corresponding to the first auxiliary information. FIG. 16 is a table showing an operation example of the wireless communication system according to the fifth embodiment. In the following description, the same reference numerals are given and the description is omitted.

The wireless terminal according to the fifth embodiment is different from the wireless terminal 70 of the second embodiment in the operation relating to the first wireless communication control unit 75.

In the fifth embodiment, when the occurrence of interference is detected, the first wireless communication control unit 75 determines information (first auxiliary information) that assists the control of interference. Then, the first wireless communication control unit 75 performs control to transmit the interference notification and information for assisting interference control to the base station 50. Information for assisting control of interference includes, for example, information (intention information) indicating the orientation of the wireless terminal 70 for a plurality of wireless communications. At this time, as in the third embodiment, information associating the intention information with the interference occurrence pattern is transmitted as the first auxiliary information so that all combinations are distinguished. In addition, as in the fourth embodiment, for example, when there is a plurality of communication services in any one of the plurality of wireless communications, the preference information gives priority to which communication service among the plurality of communication services. Contains information indicating Specifically, the orientation information is, for example, information indicating which radio communication priority is given to the VoIP communication service and the Data communication service in LTE communication. For example, in the case of LTE VoIP communication-oriented, the communication performance of LTE VoIP communication is given priority. In the case of LTE VoIP communication-oriented + LTE Data communication-oriented, the communication performance of both LTE VoIP communication and LTE Data communication is given priority over other communication. .

Specifically, the table (a) in FIG. 16 shows a setting example of first auxiliary information, and the table (b) in FIG. 16 shows a setting example of wireless communication parameters based on the first auxiliary information in (a). . In FIG. 16, “Both interference” indicates that the occurrence of interference (deterioration of communication performance) is detected in both LTE communication and ISM communication, and “LTE only deterioration” indicates the occurrence of interference in LTE communication (communication performance). "Deterioration of ISM" indicates that the occurrence of interference (deterioration of communication performance) is detected in ISM communication. “LTE VoIP communication oriented” indicates that the wireless terminal 70 is oriented to VoIP communication service in LTE communication (LTE VoIP communication oriented communication priority), and “LTE VoIP communication oriented + LTE Data communication oriented” is a wireless terminal. 70 indicates that both the VoIP communication service and the Data communication service in LTE communication are oriented (prioritizing both communication performances).

In the example of FIG. 16, as the first auxiliary information, six types of information in which intention information is associated with interference occurrence patterns are transmitted as 3-bit control information in addition to the interference notification.

Other configurations of the radio terminal according to the fifth embodiment are the same as the configurations of the radio terminal 70 of the second embodiment. The hardware configuration of the wireless terminal according to the fifth embodiment is the same as the hardware configuration of the wireless terminal 70 of the second embodiment.

The base station according to the fifth embodiment is different from the base station 50 according to the second embodiment in operations related to the radio communication control unit 58.

In the fifth embodiment, the wireless communication control unit 58 receives interference notification and information for assisting interference control (first auxiliary information) from the wireless terminal 70 and transmits control information related to wireless communication to the wireless terminal 70. Control. For example, when receiving information for assisting interference control, the wireless communication control unit 58 determines a wireless communication parameter.

Specifically, as illustrated in the table (b) of FIG. 16, the base station 50, when the first auxiliary information X = 000 (“LTE VoIP communication orientation” and “bidirectional interference”), If VoIP communication is in progress, retain at least the VoIP settings, and if other communications are in progress at the same time, retain at least the current settings of other communications, or lower the priority of other communications The wireless communication parameters are determined as follows.

When the first auxiliary information X = 010 (“LTE VoIP communication orientation” and “LTE only deteriorated”), the base station 50 retains the VoIP settings and performs other communications at the same time. When the communication is in progress, the wireless communication parameters are determined so as to lower the priority of other communication.

When the first auxiliary information X = 100 (“LTE VoIP communication orientation” and “ISM only deteriorates”), the base station 50 retains at least the current setting and performs LTE Data communication. Wireless communication parameters are determined so as to reduce the activity.

When the first auxiliary information X = 001 ("LTE VoIP communication orientation + LTE Data communication orientation" and "Both interference"), the base station 50 retains the VoIP communication settings while performing VoIP communication. When other communication is being performed, at least the current LTE Data communication setting is retained, or the wireless communication parameter is determined so as to increase the activity of LTE Data communication.

In the case of the first auxiliary information X = 011 (“LTE VoIP communication orientation + LTE Data communication orientation” and “LTE only deteriorates”), the base station 50 retains the VoIP communication settings when VoIP communication is being performed.
If another communication is being performed at the same time, wireless communication parameters are determined so as to increase the activity of LTE Data communication.

When the first auxiliary information X = 101 (“LTE VoIP communication-oriented + LTE Data communication-oriented” and “ISM only deteriorated”), the base station 50 holds at least the current setting and is performing LTE Data communication. Wireless communication parameters are determined so as to reduce the activity of LTE Data communication.

For example, when the activity of LTE communication is increased (activated), the radio communication parameter is set to shorten the DRX cycle or to increase the scheduling frequency. Further, for example, when lowering the LTE communication activity, the wireless communication parameter is set so as to make the DRX cycle longer or set the scheduling frequency lower.

For example, when the information indicating the interference level is included in the interference notification, it is determined according to the interference level whether to maintain the current setting or to change the activity or priority of LTE communication in the above example. May be.

Other configurations of the base station according to the fifth embodiment are the same as the configurations of the base station 50 according to the second embodiment. The hardware configuration of the base station according to the fifth embodiment is the same as the hardware configuration of the base station 50 according to the second embodiment.

Next, the operation of the wireless communication system in the fifth embodiment will be described. In the fifth embodiment, similarly to S23 of the second embodiment, the first auxiliary information is determined as illustrated in FIG. 16 and transmitted to the base station 50 together with the interference notification. And similarly to S25 of 2nd Embodiment, the base station 50 will determine a radio | wireless communication parameter, if 1st auxiliary information is received. And similarly to S27 of 2nd Embodiment, the radio | wireless terminal 70 controls communication based on the received radio | wireless communication parameter. Thereby, the interference is controlled so as to reduce or avoid the interference. Thus, before the different frequency measurement is completed, the interference control is started at an early stage according to the first auxiliary information, so that the interference control is quickly performed and the communication performance is improved.

Further, by performing communication control using the wireless communication parameters determined as described above, the activity and priority of the intended wireless communication or wireless communication service are relatively increased. By making the difference in activity through such communication control, interference is reduced or avoided and communication performance is improved at least for communication intended (prioritized) by the wireless terminal 70.

At this time, since the six types of information in which the intention information and the interference occurrence pattern are associated with each other are notified in a distinguishable manner, more detailed scheduling is performed based on the six types of information, and an appropriate wireless communication is performed. Communication parameters can be determined.

As described above, according to the fifth embodiment, a wireless terminal that performs a plurality of wireless communications can control interference in the wireless terminal and improve communication performance.

[Sixth Embodiment]
Next, a radio communication system according to the sixth embodiment will be described. The overall configuration of the wireless communication system according to the sixth embodiment is the same as the configuration of the wireless communication system according to the second embodiment. The sixth embodiment is different from the second embodiment in operations related to determination of first auxiliary information and determination of wireless communication parameters corresponding to the first auxiliary information. The sixth embodiment is an operation that combines the third embodiment and the fifth embodiment. FIG. 17 is a table showing an operation example of the wireless communication system according to the sixth embodiment. In the following description, the same reference numerals are given and the description is omitted.

The wireless terminal according to the sixth embodiment is different from the wireless terminal 70 according to the second embodiment in operations related to the first wireless communication control unit 75.

In the sixth embodiment, when the occurrence of interference is detected, the first wireless communication control unit 75 determines information (first auxiliary information) that assists in controlling the interference. Then, the first wireless communication control unit 75 performs control to transmit the interference notification and information for assisting interference control to the base station 50. Information for assisting control of interference includes, for example, information (intention information) indicating the orientation of the wireless terminal 70 for a plurality of wireless communications. At this time, information associating the intention information with the interference occurrence pattern is transmitted as the first auxiliary information so that all combinations are distinguished. In addition, as in the fifth embodiment, for example, when there is a plurality of communication services in any one of the plurality of wireless communications, the preference information gives priority to which communication service among the plurality of communication services. Contains information indicating Specifically, the orientation information is, for example, information indicating which radio communication priority is given to the VoIP communication service and the Data communication service in LTE communication. For example, in the case of LTE VoIP communication-oriented, the communication performance of LTE VoIP communication is given priority. In the case of LTE VoIP communication-oriented + LTE Data communication-oriented, the communication performance of both LTE VoIP communication and LTE Data communication is given priority over other communication. .

Specifically, the table (a) in FIG. 17 shows a setting example of first auxiliary information, and the table (b) in FIG. 17 shows a setting example of wireless communication parameters based on the first auxiliary information in (a). . In FIG. 17, “Both interference” indicates that the occurrence of interference (deterioration of communication performance) is detected in both LTE communication and ISM communication, and “LTE only deterioration” indicates the occurrence of interference in LTE communication (communication performance). "Deterioration of ISM" indicates that the occurrence of interference (deterioration of communication performance) is detected in ISM communication. “LTE VoIP communication oriented” indicates that the wireless terminal 70 is oriented to VoIP communication service in LTE communication (LTE VoIP communication oriented communication priority), and “LTE VoIP communication oriented + LTE Data communication oriented” is a wireless terminal. 70 indicates that both the VoIP communication service and the Data communication service in LTE communication are oriented (prioritizing both communication performances). “ISM communication orientation” indicates that the wireless terminal 70 is oriented to ISM communication (priority is given to the communication performance of ISM communication).

In the example of FIG. 17, nine types of information in which intention information is associated with interference occurrence patterns are transmitted as first auxiliary information in addition to the interference notification as 4-bit control information.

Other configurations of the radio terminal according to the sixth embodiment are the same as the configurations of the radio terminal 70 of the second embodiment. The hardware configuration of the wireless terminal according to the sixth embodiment is the same as the hardware configuration of the wireless terminal 70 of the second embodiment.

The base station according to the sixth embodiment is different from the base station 50 according to the second embodiment in operations related to the wireless communication control unit 58.

In the sixth embodiment, the wireless communication control unit 58 receives interference notification and information for assisting interference control (first auxiliary information) from the wireless terminal 70 and transmits control information related to wireless communication to the wireless terminal 70. Control. For example, when receiving information for assisting interference control, the wireless communication control unit 58 determines a wireless communication parameter.

At this time, specifically, as illustrated in the table (b) of FIG. 17, the base station 50 determines the wireless communication parameters with nine types of patterns according to the first auxiliary information.

Other configurations of the base station according to the sixth embodiment are the same as the configurations of the base station 50 according to the second embodiment. The hardware configuration of the base station according to the sixth embodiment is the same as the hardware configuration of the base station 50 according to the second embodiment.

Next, the operation of the wireless communication system in the sixth embodiment will be described. In the sixth embodiment, similarly to S23 of the second embodiment, the first auxiliary information is determined as illustrated in FIG. 17 and transmitted to the base station 50 together with the interference notification. And similarly to S25 of 2nd Embodiment, the base station 50 will determine a radio | wireless communication parameter, if 1st auxiliary information is received. And similarly to S27 of 2nd Embodiment, the radio | wireless terminal 70 controls communication based on the received radio | wireless communication parameter. Thereby, the interference is controlled so as to reduce or avoid the interference. Thus, before the different frequency measurement is completed, the interference control is started at an early stage according to the first auxiliary information, so that the interference control is quickly performed and the communication performance is improved.

Further, by performing communication control using the wireless communication parameters determined as described above, the activity and priority of the intended wireless communication or wireless communication service are relatively increased. By making the difference in activity through such communication control, interference is reduced or avoided and communication performance is improved at least for communication intended (prioritized) by the wireless terminal 70.

At this time, since nine types of information in which the intention information and the occurrence pattern of interference are associated with each other are notified in a distinguishable manner, more detailed scheduling is performed based on the nine types of information, and appropriate radio Communication parameters can be determined.

As described above, according to the sixth embodiment, a wireless terminal that performs a plurality of wireless communications can control interference in the wireless terminal and improve communication performance.

[Seventh Embodiment]
Next, a radio communication system according to the seventh embodiment will be described. The overall configuration of the wireless communication system according to the seventh embodiment is the same as the configuration of the wireless communication system according to the second embodiment. The seventh embodiment is different from the second embodiment in operations related to determination of first auxiliary information and determination of wireless communication parameters according to the first auxiliary information. FIG. 18 is a table showing an operation example of the wireless communication system according to the seventh embodiment. In the following description, the same reference numerals are given and the description is omitted.

The configuration of the wireless terminal according to the seventh embodiment is the same as the configuration of the wireless terminal 70 of the second embodiment. The hardware configuration of the wireless terminal according to the seventh embodiment is the same as the hardware configuration of the wireless terminal 70 of the second embodiment.

The base station according to the seventh embodiment is different from the base station 50 according to the second embodiment in operations related to the radio communication control unit 58.

In the seventh embodiment, the wireless communication control unit 58 receives interference notification and information for assisting interference control (first auxiliary information) from the wireless terminal 70 and transmits control information related to wireless communication to the wireless terminal 70. Control. For example, when receiving information for assisting interference control, the wireless communication control unit 58 determines a wireless communication parameter.

In this case, specifically, as illustrated in the table (b) of FIG. 18, the base station 50 performs the case where the first auxiliary information X = 1 (“LTE communication orientation”, “Both interference” or “ The wireless communication parameters are determined so as to increase the activity of LTE communication. For example, the wireless communication parameter is set to increase the frequency of autonomous stop used in the autonomous denial method when the activity level of LTE communication is increased (activated).

In addition, when the first auxiliary information X = 0 (in the case of “ISM communication-oriented”, “two-way interference” or “degradation of only ISM”), the base station 50 sets the wireless communication parameter so as to reduce the activity of LTE communication. To decide. For example, when reducing the LTE communication activity, the wireless communication parameter is set so as to reduce the frequency of the autonomous stop used in the Auto denial method.

Other configurations of the base station according to the seventh embodiment are the same as the configurations of the base station 50 according to the second embodiment. The hardware configuration of the base station according to the seventh embodiment is the same as the hardware configuration of the base station 50 according to the second embodiment.

Next, the operation of the wireless communication system in the seventh embodiment will be described. In the seventh embodiment, similarly to S23 of the second embodiment, the first auxiliary information is determined as illustrated in FIG. 14 and transmitted to the base station 50 together with the interference notification. And similarly to S25 of 2nd Embodiment, the base station 50 will determine a radio | wireless communication parameter, if 1st auxiliary information is received. And similarly to S27 of 2nd Embodiment, the radio | wireless terminal 70 controls communication based on the received radio | wireless communication parameter. Thereby, the interference is controlled so as to reduce or avoid the interference. Thus, before the different frequency measurement is completed, the interference control is started at an early stage according to the first auxiliary information, so that the interference control is quickly performed and the communication performance is improved.

Further, by performing communication control using the wireless communication parameters determined as described above, the activity and priority of the intended wireless communication or wireless communication service are relatively increased. By making the difference in activity through such communication control, interference is reduced or avoided and communication performance is improved at least for communication intended (prioritized) by the wireless terminal 70. Specifically, when the wireless terminal 70 is oriented to LTE communication, the activity of LTE communication is increased by controlling LTE communication so as to reduce the frequency of autonomous stop. Further, when the wireless terminal 70 is oriented to ISM communication, controlling the LTE communication so as to increase the frequency of autonomous stop decreases the activity of the LTE communication and relatively increases the activity of the ISM communication. By making the difference in activity through such communication control, interference is reduced or avoided and communication performance is improved at least for communication intended (prioritized) by the wireless terminal 70.

As described above, according to the seventh embodiment, a wireless terminal that performs a plurality of wireless communications can control interference in the wireless terminal and improve communication performance.

In the seventh embodiment, according to the orientation information, the base station 50 determines the frequency of autonomous stop used in the autonomous denial scheme as a wireless communication parameter and notifies the wireless terminal 70 of the orientation information and the city. Accordingly, the frequency of autonomous stop used in the autonomous denial method may be determined by the wireless terminal 70, and interference control may be performed using the determined frequency.

Also, in the seventh embodiment, in the second embodiment, when increasing the LTE communication activity, the autonomous stop frequency used in the Autonomous Denial method is increased, and when reducing the LTE communication activity, the Autonomous Denial method is used. In the third to sixth embodiments, similarly, the frequency of autonomous stop may be changed to autonomous stop.

Moreover, the radio | wireless communications system of 1st-7th embodiment is realizable as a LTE system or a LTE-A system, for example. Note that the present invention can also be applied to a wireless communication system using a communication method other than LTE or LTE-A.

The first to seventh embodiments can be applied to a mobile terminal such as a mobile phone, a smartphone, and a PDA (Personal Digital Assistant) as a wireless terminal. The first to fourth embodiments can be applied to various communication devices that perform communication with a base station, such as user equipment (User Equipment, UE), a mobile station, and a mobile relay station.

The first to seventh embodiments can be applied to base stations of various scales such as macro base stations and femto base stations as base stations. In addition, the first to seventh embodiments can be applied to various communication devices that perform communication with a wireless terminal such as a relay station.

Further, the specific mode of distribution / integration of each component of the base station and the wireless terminal is not limited to the mode of the first to seventh embodiments, and all or a part thereof can be used for various loads, usage conditions, etc. Accordingly, it may be configured to be functionally or physically distributed / integrated in an arbitrary unit. For example, the memory may be connected via a network or a cable as an external device of a base station or a wireless terminal.

1 Wireless communication system
2 network
3 Network equipment
10 base stations
C10 cell
20 Wireless terminal
11, 21A, 21B Transmitter
12, 22A, 22B receiver
13, 23A, 23B Control unit
31, 41A, 41B Antenna
32, 42A, 42B RF circuit
33, 43A, 43B CPU
34 DSP
35, 44A, 44B Memory
36 Network IF
50 base station
51 Transmit / Receive antenna
52 Transmission / reception switching unit
53 Received signal processor
54 Data acquisition unit
55 RS acquisition unit
56 Data transfer unit
58 Wireless communication controller
59 Data generator
60 RS generator
61 Transmission signal processor
70 wireless terminal
71 Transmit / Receive Antenna
72 Transmission / reception switching unit
73 Received signal processor
74 Data acquisition unit
75 First wireless communication control unit
76 Interference detector
77 Data generator
78 Transmission signal processor
80 Application processing section
82 Transmit / Receive Antenna
83 Transmission / reception switching unit
84 Received signal processor
85 Data acquisition unit
86 Second wireless communication control unit
87 Interference detector
88 Data generator
89 Transmission signal processor

Claims (8)

A wireless communication method,
Whether a wireless terminal capable of performing wireless communication of a plurality of different methods including wireless communication of the first method and wireless communication other than the first method has detected occurrence of interference in the wireless communication of the first method, Contains information indicating whether the occurrence of interference has been detected in wireless communication other than the first method, or whether the occurrence of interference has been detected in both wireless communication of the first method and wireless communication other than the first method Send auxiliary information to the base station,
The wireless terminal receives, from the base station that has received the auxiliary information from the wireless terminal, a control signal including a wireless parameter that enables suppression of interference of at least one of the plurality of different types of wireless communication. A wireless communication method. A wireless communication system,
A base station,
A wireless terminal capable of performing wireless communication of a plurality of different methods including wireless communication of the first method and wireless communication other than the first method;
The wireless terminal is
Whether the occurrence of interference is detected in the wireless communication of the first method, the occurrence of interference is detected in the wireless communication other than the first method, or the wireless communication of the first method and the wireless method other than the first method A control unit that performs control to transmit auxiliary information including information indicating whether occurrence of interference is detected in both communication and the base station;
A receiving unit that receives the control information from a base station that transmits a control signal including a radio parameter that enables suppression of at least any interference of the plurality of different types of radio communication from the base station;
Have
The base station
A transmitter that receives the auxiliary information from the wireless terminal and transmits the control signal including a wireless parameter capable of suppressing interference of at least one of the plurality of different types of wireless communication;
A wireless communication system. In a wireless communication system, a base station capable of wireless communication with a wireless terminal capable of performing wireless communication of a plurality of different methods including wireless communication of the first method and wireless communication other than the first method,
Auxiliary information transmitted from the wireless terminal, the occurrence of interference being detected in the wireless communication of the first method, the occurrence of interference being detected in wireless communication other than the first method, or the first A receiving unit that receives from the wireless terminal the auxiliary information including information indicating whether the occurrence of interference is detected in both one-way wireless communication and wireless communication other than the first method;
A transmitter that receives the auxiliary information from the wireless terminal and transmits a control signal including a wireless parameter that enables suppression of interference of at least one of the plurality of different types of wireless communication;
Base station with   The base station according to claim 3, wherein the auxiliary information further includes information on correspondence between the interference and a communication service.   5. The base station according to claim 3, wherein the reception unit receives information assisting the control of the interference from the wireless terminal that has performed measurement for the control of the interference. A wireless terminal capable of executing wireless communication of a plurality of different methods including wireless communication of the first method and wireless communication other than the first method,
Whether the occurrence of interference is detected in the wireless communication of the first method, the occurrence of interference is detected in the wireless communication other than the first method, or the wireless communication of the first method and the wireless method other than the first method A control unit that controls to transmit auxiliary information including information indicating whether the occurrence of interference has been detected in both communication and the base station;
A receiving unit that receives a control signal including a radio parameter capable of suppressing interference of at least any of the plurality of different types of radio communication from a base station that receives the auxiliary information;
A wireless terminal.   The wireless terminal according to claim 6, wherein the auxiliary information further includes information on correspondence between the interference and a communication service.   The wireless terminal according to claim 6 or 7, wherein the control unit performs measurement for controlling the interference and transmits information for assisting the control of the interference to the base station. .

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