US20210068093A1 - Wireless communication apparatus, wireless communication system, and processing method - Google Patents
Wireless communication apparatus, wireless communication system, and processing method Download PDFInfo
- Publication number
- US20210068093A1 US20210068093A1 US17/096,842 US202017096842A US2021068093A1 US 20210068093 A1 US20210068093 A1 US 20210068093A1 US 202017096842 A US202017096842 A US 202017096842A US 2021068093 A1 US2021068093 A1 US 2021068093A1
- Authority
- US
- United States
- Prior art keywords
- wireless communication
- communication apparatus
- qos
- signal
- level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004891 communication Methods 0.000 title claims abstract description 188
- 238000003672 processing method Methods 0.000 title description 3
- 238000013507 mapping Methods 0.000 claims 4
- 238000000034 method Methods 0.000 description 39
- 230000005540 biological transmission Effects 0.000 description 36
- 230000006870 function Effects 0.000 description 27
- 230000008569 process Effects 0.000 description 23
- 238000009826 distribution Methods 0.000 description 13
- 238000009827 uniform distribution Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012887 quadratic function Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H04W72/0406—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
-
- H04W72/087—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
Definitions
- the embodiments discussed here are related to a wireless communication apparatus, a wireless communication system, and a processing method.
- 3GPP 3rd Generation Partnership Project
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- 3GPP Release8 to Release12 are formulated as international specifications.
- D2D communication Service based on terminal proximity; hereinafter referred to as “D2D communication” in some cases
- the D2D communication is, for example, a wireless communication method in which wireless communication is performed between terminals without using a core network. Through the D2D communication, for example, it is possible to reduce a load on the core network or to increase the capacity of a default bandwidth.
- the D2D communication supports two functions such as a discovery function and a direct communication function.
- the discovery function is, for example, a function of finding a proximity terminal based on transmission and reception of a discovery signal.
- the direct communication function is, for example, a function of terminals directly performing communication with each other.
- the discovery function is expected to be mainly used for a commercial service, and the direct communication function is expected to be mainly used for public safety such as police or fire wireless communication.
- the discovery function in a commercial service may be supposed to be used within a network coverage.
- 3GPP Release12 defines the following two methods as methods of transmitting a discovery signal.
- the first method is a method in which a base station explicitly allocates a radio resource for transmitting a discovery signal to a terminal, and the terminal transmits a discovery signal by using the radio resource.
- the second method is a method in which a base station allocates a resource pool to a terminal, and the terminal transmits a discovery signal by using a radio resource selected from the resource pool.
- the terminal acquires a random number p 1 , and can use the resource pool in a case where the acquired random number is smaller than a threshold value (Tx:tx-probability).
- FIG. 14 illustrates a relationship example between the random number p 1 and the probability P.
- a transverse axis expresses the random number p 1
- a longitudinal axis expresses the probability P.
- a probability of being capable of using the resource pool at values of the random number p 1 from “0” to “Tx” is 1/Tx, and the probability 1/Tx is uniform from “0” to “Tx”.
- Non-Patent Literature 1 [3GPP TS36.300 V12.5.0 (2015-03)]
- Non-Patent Literature 2 [3GPP TS36.211 V12.5.0 (2015-03)]
- Non-Patent Literature 3 [3GPP TS36.212 V12.4.0 (2015-03)]
- Non-Patent Literature 4 [3GPP TS36.213 V12.5.0 (2015-03)]
- Non-Patent Literature 5 [3GPP TS36.321 V12.5.0 (2015-03)]
- Non-Patent Literature 6 [3GPP TS36.322 V12.2.0 (2015-03)]
- Non-Patent Literature 7 [3GPP TS36.323 V12.3.0 (2015-03)]
- Non-Patent Literature 8 [3GPP TS36.331 V12.5.0 (2015-03)]
- Non-Patent Literature 9 [3GPP TS36.413 V12.5.0 (2015-03)]
- a wireless communication apparatus for performing wireless communication with a first wireless communication apparatus based on a discovery signal, includes: a control circuit configured to control a probability of using a radio resource for the discovery signal; and a communication circuit configured to transmit the discovery signal to the first wireless communication apparatus through the radio resource in accordance with the probability.
- FIG. 1 illustrates a configuration example of a wireless communication system
- FIG. 2 illustrates a configuration example of the wireless communication system
- FIG. 3 illustrates a configuration example of a base station apparatus
- FIG. 4 illustrates a configuration example of a mobile station apparatus
- FIGS. 5A and 5B illustrate examples of probability distributions
- FIG. 6 illustrates an example in which the mobile station apparatus transmits a priority value
- FIG. 7 is a sequence diagram illustrating an operation example
- FIG. 8 illustrates an example of a probability distribution
- FIG. 9 is a sequence diagram illustrating an operation example
- FIGS. 10A and 10B illustrate examples of probability distributions
- FIG. 11 is a flowchart illustrating an operation example
- FIG. 12 illustrates a hardware configuration example of the base station apparatus
- FIG. 13 illustrates a hardware configuration example of the mobile station apparatus
- FIG. 14 illustrates an example of a probability distribution.
- the terminal in a case where the acquired random number p 1 exceeds the threshold value Tx even if a quality of service (QoS) level is more than a predetermined value, the terminal may not use the resource pool. In a case where the acquired random number p 1 smaller the threshold value Tx even if the QoS level is equal to or less than the predetermined value, the terminal may use the resource pool. In this case, since the QoS level is less than the predetermined value, even if a discovery signal is transmitted, the terminal may not find other terminals, and thus may not performed D2D communication.
- QoS quality of service
- a wireless communication apparatus for improving service quality in a wireless communication apparatus, a wireless communication system, and a processing method.
- Non-Patent Literatures 1 to 12 may be used in terms of the date, but are updated at any time, and thus terms or technical contents disclosed in the above Non-Patent Literatures 1 to 12 issued right before the filing date of the present application may be appropriately used in the specification of the present application.
- Non-Patent Literature 1 (3GPP TS36.300 V12.5.0 (2015-03)) discloses, for example, a summary specification of LTE-Advanced.
- Non-Patent Literature 2 (3GPP TS36.211 V12.5.0 (2015-03)) discloses, for example, a physical layer (PHY) channel (or a physical channel) specification of LTE-A.
- PHY physical layer
- Non-Patent Literature 3 (3GPP TS36.212 V12.4.0 (2015-03)) discloses, for example, a PHY encoding specification of LTE-A.
- Non-Patent Literature 4 (3GPP TS36.213 V12.5.0 (2015-03)) discloses, for example, a PHY procedure specification of LTE-A.
- Non-Patent Literature 5 (3GPP TS36.321 V12.5.0 (2015-03)) discloses, for example, a Medium Access Control (MAC) specification of LTE-A.
- MAC Medium Access Control
- Non-Patent Literature 6 (3GPP TS36.322 V12.2.0 (2015-03)) discloses, for example, a Radio Link Control (RLC) specification of LTE-A.
- RLC Radio Link Control
- Non-Patent Literature 7 (3GPP TS36.323 V12.3.0 (2015-03)) discloses, for example, a Packet Data Convergence Protocol (PDCP) specification of LTE-A.
- PDCP Packet Data Convergence Protocol
- Non-Patent Literature 8 (3GPP TS36.331 V12.5.0 (2015-03)) discloses, for example, a Radio Resource Control (RRC) specification of LTE-A.
- RRC Radio Resource Control
- Non-Patent Literature 9 (3GPP TS36.413 V12.5.0 (2015-03)) discloses, for example, an S1 specification of LTE-A.
- Non-Patent Literature 10 (3GPP TS36.423 V12.5.0 (2015-03)) discloses, for example, an X2 specification of LTE-A.
- Non-Patent Literature 11 (3GPP TR36.842 V12.0.0 (2013-12)) is, for example, an examination note for a small cell technique of LTE-A.
- Non-Patent Literature 12 (3GPP TR36.843 V12.0.1 (2014-03)) is, for example, an examination note for a D2D communication technique.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10 in the first embodiment.
- the wireless communication system 10 includes first to third wireless communication apparatuses 200 - 1 , 200 - 2 , and 100 .
- the first wireless communication apparatus 200 - 1 and the second wireless communication apparatus 200 - 2 perform wireless communication based on a discovery signal.
- the first and second wireless communication apparatuses 200 - 1 and 200 - 2 perform D2D communication.
- the first wireless communication apparatus 200 - 1 performs wireless communication with the third wireless communication apparatus 100 .
- the first and third wireless communication apparatuses 200 - 1 or 100 respectively include control units 207 and 104 .
- the control units 207 and 104 control a probability of using a radio resource for a discovery signal.
- information regarding the controlled probability may be output to a communication unit 206 .
- the control unit 104 controls a probability of using a radio resource for a discovery signal, information regarding the controlled probability may be output to the communication unit 206 .
- the first wireless communication apparatus 200 - 1 includes the communication unit 206 .
- the communication unit 206 uses a radio resource according to a radio resource usage probability controlled by the control unit 207 or 104 , and transmits a discovery signal to the second wireless communication apparatus 200 - 2 .
- the first or third wireless communication apparatus 200 - 1 or 100 controls a probability of using a discovery signal. Consequently, for example, it is possible to avoid a situation in which the first wireless communication apparatus 200 - 1 may not transmit a discovery signal in a case where a QoS level of the discovery signal is high. For example, it is possible to avoid a situation in which the first wireless communication apparatus 200 - 1 repeatedly transmits a discovery signal many times in a case where a QoS level of the discovery signal is low. Therefore, in the wireless communication system 10 , it is possible to improve service quality for a discovery signal, and further service quality for D2D communication.
- FIG. 2 illustrates a configuration example of a wireless communication system 10 .
- the wireless communication system 10 includes a base station apparatus (hereinafter, referred to as a “base station” in some cases) 100 , and mobile station apparatuses (hereinafter, referred to as “mobile stations” in some cases) 200 - 1 and 200 - 2 .
- base station hereinafter, referred to as a “base station” in some cases
- mobile station apparatuses hereinafter, referred to as “mobile stations” in some cases
- the base station 100 is, for example, a wireless communication apparatus which performs wireless communication with the mobile stations 200 - 1 and 200 - 2 located in a service area of the base station.
- Each of the mobile stations 200 - 1 and 200 - 2 is, for example, a wireless communication apparatus such as a smart phone, a feature phone, a tablet terminal, a personal computer, or a game apparatus.
- the mobile stations 200 - 1 and 200 - 2 may perform wireless communication with the base station 100 so as to be provided with various services such as a call service or a web page viewing service.
- the mobile stations 200 - 1 and 200 - 2 may perform D2D communication.
- the D2D communication is a communication method specified as Device to Device Proximity Service (ProSe) (service based on terminal proximity) in 3GPP Release12.
- ProSe Device to Device Proximity Service
- the mobile stations 200 - 1 and 200 - 2 performs D2D communication using the discovery function.
- the mobile station 200 - 1 transmits and receives a discovery signal (or an inter-terminal finding signal) so as to find another mobile station 200 - 2 , and the D2D communication is performed between the mobile stations 200 - 1 and 200 - 2 .
- the discovery signal is a signal used to find the peripheral mobile station 200 - 2 in order for the mobile station 200 - 1 to perform the D2D communication.
- the mobile stations 200 - 1 and 200 - 2 receive parameter information such as a synchronization signal or a radio resource from the base station 100 .
- the mobile stations 200 - 1 and 200 - 2 perform the D2D communication based on the received parameter information.
- the parameter information also includes a radio resource for a discovery signal.
- the radio resource for a discovery signal has several candidates in a resource pool, and, for example, the mobile station 200 - 1 transmits a discovery signal by using a radio resource in the resource pool.
- the mobile stations 200 - 1 and 200 - 2 may transmit a discovery signal by using the Physical Sidelink Discovery Channel (PSDCH).
- PSDCH Physical Sidelink Discovery Channel
- the base station 100 may perform a notification of (or may perform broadcast transmission of) parameter information regarding the D2D communication by using the System Information Block (SIB) 18 or the SIB19.
- SIB System Information Block
- the SIB18 includes D2D communication parameter information using the direct communication function
- the SIB19 includes D2D communication parameter information using the discovery function.
- the base station 100 and the mobile stations 200 - 1 and 200 - 2 can perform bidirectional wireless communication.
- communication in a direction hereinafter, referred to as a “downlink (DL) direction” in some cases
- DL downlink
- uplink (UL) direction in some cases
- the base station 100 performs scheduling with respect to wireless communication in a downlink direction and an uplink direction with the mobile stations 200 - 1 and 200 - 2 , so as to allocate a radio resource or to determine an encoding method or a modulation method.
- the base station 100 transmits a control signal including scheduling information indicating a scheduling result to the mobile stations 200 - 1 and 200 - 2 .
- the base station 100 and the mobile stations 200 - 1 and 200 - 2 perform wireless communication according to the scheduling information included in the control signal.
- the mobile stations 200 - 1 and 200 - 2 may perform the D2D communication by using, for example, a radio resource allocated from the base station 100 when the mobile stations 200 - 1 and 200 - 2 perform wireless communication in an uplink direction.
- the number of mobile stations may be three or more, and the respective mobile stations may perform the D2D communication with each other.
- the two mobile stations 200 - 1 and 200 - 2 performing the D2D communication are located within a cell range (or a service providing range) of the base station 100 .
- one of the two mobile stations 200 - 1 and 200 - 2 performing the D2D communication may be located within the cell range of the base station 100 , and the other may be located out of the cell range.
- the mobile stations 200 - 1 and 200 - 2 may be moved from the cell range of the base station 100 to the outside of the cell range, and may perform the D2D communication.
- a configuration example of the wireless communication system 10 may appropriately employ, for example, scenarios written in specifications regarding the D2D communication, including the above non-patent literatures.
- the mobile stations 200 - 1 and 200 - 2 have the same configuration, and thus will be described as a mobile station 200 unless otherwise mentioned.
- FIG. 3 is a diagram illustrating a configuration example of the base station 100 .
- the base station 100 includes a wireless transmission unit 101 , a wireless reception unit 102 , the control unit 104 , a storage unit 105 , and a network communication unit 106 .
- the wireless transmission unit 101 and the wireless reception unit 102 may be included in a wireless communication unit (or communication unit) 103 .
- the wireless transmission unit 101 performs, for example, an error correction coding (ECC) process (hereinafter, referred to as an “encoding process” in some cases), a modulation process, and a frequency conversion process on data read from the storage unit 105 or a control signal output from the control unit 104 , so as to convert the data or the control signal into a radio signal.
- ECC error correction coding
- the wireless transmission unit 101 transmits the radio signal after conversion to the mobile station 200 .
- the wireless reception unit 102 receives, for example, a radio signal transmitted from the mobile station 200 .
- the wireless reception unit 102 performs a frequency conversion process, a demodulation process, or an error correction decoding process (hereinafter, referred to as a “decoding process” in some cases) on the received radio signal, so as to extract data or a control signal.
- the wireless reception unit 102 outputs the extracted data or control signal to the storage unit 105 or the control unit 104 .
- the control unit 104 performs the scheduling, and outputs a result thereof to the wireless transmission unit 101 or the wireless reception unit 102 as scheduling information.
- the control unit 104 generates a control signal including the scheduling information, and outputs the control signal to the wireless transmission unit 101 .
- the control signal is transmitted to the mobile station 200 .
- the wireless transmission unit 101 or the wireless reception unit 102 transmits or visitor a radio signal according to the scheduling information.
- the control unit 104 generates parameter information including information regarding a resource pool for a discovery signal transmitted and received between the mobile stations 200 - 1 and 200 - 2 , information regarding a synchronization signal, and the like.
- the parameter information is used for the mobile stations 200 - 1 and 200 - 2 to perform the D2D communication.
- the control unit 104 outputs the generated parameter information to the wireless transmission unit 101 . In this case, the control unit 104 may instruct the wireless transmission unit 101 to transmit the parameter information as notification information.
- the control unit 104 controls a probability that the mobile stations 200 - 1 and 200 - 2 may use a radio resource for a discovery signal. Specifically, the control unit 104 controls allocation of a radio resource for a discovery signal according to a QoS level. Details thereof will be described later.
- the storage unit 105 stores, for example, information regarding data or a control signal, and information regarding a resource pool.
- the wireless reception unit 102 , the control unit 104 , or the network communication unit 106 stores data or a control signal in the storage unit 105 as appropriate.
- the wireless transmission unit 101 , the control unit 104 , or the network communication unit 106 may read information regarding the data or the control signal stored in the storage unit 105 as appropriate, and may generate scheduling information or parameter information.
- the network communication unit 106 is connected to another apparatus, and transmits and transmits data or the like to and from another apparatus.
- the network communication unit 106 converts data into packet data with a format which can be output to another apparatus, or extracts data or the like from packet data received from another data so as to output the data or the like to the storage unit 105 or the control unit 104 .
- Another apparatus may be another base station, the Mobility Management Entity (MME), or the Serving Gateway (SGW).
- MME Mobility Management Entity
- SGW Serving Gateway
- FIG. 4 is a diagram illustrating a configuration example of the mobile station 200 .
- the mobile station 200 includes a first wireless transmission unit 201 , a first wireless reception unit 202 , a second wireless transmission unit 204 , a second wireless reception unit 205 , the control unit 207 , and a storage unit 208 .
- the first wireless transmission unit 201 and the first wireless reception unit 202 may be included in a first wireless communication unit (or a first communication unit) 203 .
- the second wireless transmission unit 204 and the second wireless reception unit 205 may be included in a second wireless communication unit (or a second communication unit) 206 .
- the first wireless communication unit 203 is used for wireless communication with the base station 100
- the second wireless communication unit 206 is used for D2D communication with other mobile stations.
- the first wireless transmission unit 201 performs, for example, an encoding process, a modulation process, and a frequency conversion process on data read from the storage unit 208 or a control signal output from the control unit 207 , so as to convert the data or the control signal into a radio signal.
- the first wireless transmission unit 201 transmits the radio signal to the base station 100 .
- the first wireless reception unit 202 receives the radio signal transmitted from the base station 100 .
- the first wireless reception unit 202 performs a frequency conversion process, a demodulation process, or a decoding process on the received radio signal, so as to extract data, a control signal, or parameter information used for the D2D communication from the radio signal.
- the first wireless reception unit 202 outputs the extracted data, control signal, or parameter information to the control unit 207 or the storage unit 208 .
- the second wireless transmission unit 204 performs, for example, an encoding process, a modulation process, and a frequency conversion process on a discovery signal output from the control unit 207 or data read from the storage unit 208 , so as to convert the discovery signal or the data into a radio signal.
- the second wireless transmission unit 204 transmits the radio signal to other mobile stations performing the D2D communication.
- the second wireless reception unit 205 receives the radio signal transmitted from another mobile station.
- the second wireless reception unit 205 performs a frequency conversion process, a demodulation process, or an encoding process on the received radio signal, so as to extract a discovery signal or data from the radio signal.
- the second wireless reception unit 205 outputs, for example, the extracted discovery signal or data to the control unit 207 or the storage unit 208 .
- the control unit 207 receives a control signal from the first wireless reception unit 202 , extracts scheduling information or the like from the control signal, and outputs the scheduling information or the like to the first wireless transmission unit 201 or the first wireless reception unit 202 .
- the first wireless transmission unit 201 and the first wireless reception unit 202 transmits a radio signal to the base station 100 or visitor a radio signal transmitted from the base station 100 according to the scheduling information included in the control signal.
- the control unit 207 receives parameter information from the first wireless reception unit 202 , and outputs the received parameter information to the second wireless transmission unit 204 or the second wireless reception unit 205 .
- the second wireless transmission unit 204 and the second wireless reception unit 205 performs the D2D communication with another mobile station based on the parameter information.
- the control unit 207 controls a probability of using a radio resource for a discovery signal. Specifically, the control unit 207 controls allocation of a radio resource for a discovery signal according to a QoS level. Details thereof will be described later.
- the control unit 207 may acquire a random number p 1 within a predetermined numerical value range, may determine that a radio signal for a discovery signal in a resource pool is used in a case where the acquired random number p 1 is equal to or less than a threshold value, and may determine that the resource pool is unable to be used in a case where the random number p 1 is more than the threshold value. In this case, the control unit 207 notifies the second wireless transmission unit 204 or the second wireless reception unit 205 of the determination, and the second wireless transmission unit 204 and the second wireless reception unit 205 transmit discovery signals according to the determination.
- the storage unit 208 stores, for example, information regarding data or a control signal or information regarding a resource pool.
- the first and second wireless reception units 202 and 205 or the control unit 207 may store data or a control signal in the storage unit 208 as appropriate, and the first and second wireless transmission units 201 and 204 or the control unit 207 may read information regarding the data or the control signal stored in the storage unit 208 as appropriate.
- a radio resource used to transmit or receive a discovery signal is selected from a resource pool.
- the mobile station 200 acquires the random number p 1 , can use the resource pool when the random number p 1 is equal to or less than a threshold value Tx, and is unable to use the resource pool when the random number p 1 is more than the threshold value Tx.
- the random number p 1 appears as a value from “0” to “Tx”, and a probability of being capable of using a resource pool is uniform as 1/Tx.
- the first operation example is an example in which a value of the threshold value Tx is adjusted according to a QoS level.
- FIG. 5A illustrates an example of a probability distribution.
- a transverse axis expresses the random number p 1
- the longitudinal axis expresses the probability P.
- a threshold value is set to Tx 1 in a case where a QoS level is “high QoS”
- a threshold value is set to Tx 2 ( ⁇ Tx 1 ) in a case where a QoS level is “low QoS”.
- Tx 1 a case where a QoS level is “high QoS”
- Tx 2 ⁇ Tx 1
- the threshold value Tx 1 may be Tx 1 >Tx
- the threshold value Tx 2 may be Tx 2 ⁇ Tx.
- the threshold value Tx is set to be different threshold values Tx 1 and Tx 2 according to a QoS level.
- a probability of being capable of using a resource pool is higher than in a case of the uniform distribution, and, thus, in the mobile station 200 , a probability of transmitting a discovery signal by using the resource pool can also be made higher than in a case of the uniform distribution.
- a probability of being capable of using a resource pool in the mobile station 200 is lower than in a case of the uniform distribution, and, thus, a resource pool may not be used, and thus a discovery signal may not be transmitted.
- the second operation example is an example in which the probability P that the threshold value Tx may appear as the random number p 1 is determined by a function which does not depend on a uniform distribution.
- FIG. 5B illustrates an example of a log-normal distribution as an example of such a function.
- a transverse axis expresses the random number p 1
- a longitudinal axis expresses the probability P.
- the probability P that “0.5” may appear as the random number p 1 is highest, and the probability that the random number p 1 may appear becomes gradually lower as a distance from “0.5” increases.
- the mobile station 200 can use a resource pool.
- the value acquired as the random number p 1 is “0.5” (a value appearing most) at the threshold value Tx of “0.6”
- the value is equal to or smaller than the threshold value Tx, and, thus, the mobile station 200 can use a resource pool.
- the value acquired as the random number p 1 is “0.7”
- the value is greater than the threshold value Tx, and thus the mobile station 200 is unable to use a resource pool.
- a range of the random number p 1 is set according to a QoS level of a discovery signal. For example, when a QoS level is “high QoS”, a range of the random number p 1 is set to [0,Tx] (a range in which the minimum value is “0”, and the maximum value is “Tx”), and when a QoS level is “low QoS”, a range of the random number p 1 is set to [0,1] (a range in which the minimum value is “0”, and the maximum value is “1”).
- the random number p 1 acquired in the range of [0,Tx] of the random number p 1 is equal to or less than the threshold value Tx, and, in a case of “high QoS”, the mobile station 200 can use a resource pool.
- the random number p 1 acquired in the range of [0,1] of the random number p 1 may be more than the threshold value Tx, and, in a case of “low QoS”, the mobile station 200 may be unable to use a resource pool.
- the wireless communication system 10 since a probability of using a discovery signal is controlled, it is possible to avoid a situation in which a discovery signal may not be transmitted in a case where a QoS level is high and a situation in which a discovery signal is repeatedly transmitted many times in a case where a QoS level is low. Therefore, in the wireless communication system 10 , it is possible to improve service quality for a discovery signal, and further service quality for D2D communication.
- FIG. 6 illustrates a configuration example of the wireless communication system 10 in this operation example
- FIG. 7 is a sequence diagram illustrating this operation example.
- the mobile station 200 (the mobile station 200 - 1 in the example illustrated in FIG. 6 ) notifies the base station 100 of a total number of discovery signals.
- the mobile station 200 - 1 transmits a QoS level in addition to a total number of discovery signals (S 10 in FIG. 7 ).
- the mobile station 200 - 1 may transmit a priority value to the base station 100 as an index indicating the QoS level.
- the priority value is “High”, and, in a case where the QoS level is “low QoS”, the priority value is “Low”.
- a numerical value such as “0” or “1” may be used instead of “High” or “Low”.
- the mobile station 200 - 1 performs the following process.
- the second wireless reception unit 205 measures QoS based on a radio resource transmitted from another mobile station (for example, the mobile station 200 - 2 ) performing the D2D communication or data included in the radio resource, and outputs a result thereof to the control unit 207 .
- the radio resource transmitted from another mobile station also includes a discovery signal.
- As an index of the QoS for example, there are a throughput (or a data amount or a packet amount per unit time), a packet loss, delay time, radio resource reception power, a signal to interference and noise ratio (SINR), and a carrier to interference and noise ratio (CINR).
- SINR signal to interference and noise ratio
- CINR carrier to interference and noise ratio
- the QoS may be performed by the control unit 207 instead of the second wireless reception unit 205 .
- the control unit 207 determines a priority value corresponding to a QoS level based on a table or the like stored in the storage unit 208 , and outputs the priority value to the first wireless transmission unit 201 along with a total number of discovery signals. Consequently, the priority value is transmitted from the first wireless transmission unit 201 to the base station 100 .
- the base station 100 sets the threshold values Tx 1 and Tx 2 according to the received priority value (S 11 ). For example, in a case where the priority value transmitted from the mobile station 200 - 1 is received, the wireless reception unit 102 outputs the priority value to the control unit 104 , and the control unit 104 sets the threshold values Tx 1 and Tx 2 according to the priority value. As described above, the control unit 104 sets the threshold value Tx 1 for a numerical value of which the priority value indicates “high QoS”, and sets the threshold value Tx 2 for a numerical value of which the priority value indicates “low QoS”.
- the base station 100 transmits the set threshold values Tx 1 and Tx 2 to the mobile station 200 - 1 (S 12 ).
- the base station 100 may perform broadcast transmission (or a notification) of SIB19 including the threshold values Tx 1 and Tx 2 , and may separately transmit the threshold values Tx 1 and Tx 2 to the mobile station 200 - 1 .
- the control unit 104 outputs the threshold values Tx 1 and Tx 2 to the wireless transmission unit 101 .
- the threshold values Tx 1 and Tx 2 are transmitted from the wireless transmission unit 101 to the base station 100 .
- the threshold values Tx 1 and Tx 2 are information regarding probabilities thereof in a case where the base station 100 controls the probabilities that the mobile station 200 - 1 may use a resource pool for a discovery signal.
- the mobile station 200 - 1 selects a radio resource from a resource pool based on the threshold values Tx 1 and Tx 2 , and transmits a discovery signal by using the selected radio resource (S 13 ). For example, in a case where the threshold values Tx 1 and Tx 2 are received via the first wireless reception unit 202 , the control unit 207 selects a radio resource from the resource pool by using either of the threshold values Tx 1 and Tx 2 according to the QoS level.
- the control unit 207 may read the information regarding the resource pool from the storage unit 208 as appropriate, and may acquire the random number p 1 as described above so as to select a radio resource.
- FIG. 8 illustrates an example of setting the threshold values Tx 1 and Tx 2
- FIG. 9 illustrates a sequence example in this operation example.
- the mobile station 200 receives the threshold value Tx (for example, the threshold value Tx in FIG. 14 ) transmitted from the base station 100 , and autonomously sets two threshold values Tx 1 and Tx 2 based on the threshold value Tx.
- the mobile station 200 may set the threshold values Tx 1 and Tx 2 such that an average of the threshold values Tx 1 and Tx 2 is the threshold value Tx. This is so that, for example, the mobile station 200 handles a probability of using a resource pool not differently from a system of the related art but as equally thereto as possible.
- the base station 100 transmits the threshold value Tx (S 20 ).
- the base station 100 may transmit the threshold value Tx by using SIB19, and may separately transmit the threshold value Tx to the mobile station 200 - 1 .
- the control unit 104 reads the threshold value Tx from the storage unit 105 and outputs the threshold value Tx to the wireless transmission unit 101 , and the threshold value Tx is transmitted from the wireless transmission unit 101 to the mobile station 200 - 1 .
- the mobile station 200 - 1 autonomously sets the threshold values Tx 1 and Tx 2 such that an average of the two threshold values Tx 1 and Tx 2 is the threshold value Tx (S 21 ).
- the control unit 207 receives the threshold value Tx from the first wireless reception unit 202 , and sets the threshold values Tx 1 and Tx 2 such that a value (or an average) obtained by dividing a result of adding the threshold values Tx 1 and Tx 2 together by “2” is the threshold value Tx.
- the mobile station 200 - 1 selects a radio resource from the resource pool based on the threshold values Tx 1 and Tx 2 according to the QoS level, and transmits a discovery signal by using the selected radio resource (S 22 ).
- FIGS. 10A and 10B illustrate examples of distributions in this operation example.
- FIGS. 10A and 10B illustrate examples of log-normal distributions, but any function or distribution may be used, for example, except for a uniform distribution.
- an n-th order function such as a linear function or a quadratic function, a triangular distribution, a binomial distribution, a Poisson distribution, and a geometric distribution may be used.
- FIG. 10B illustrates an example in which a range of the random number p 1 is set according to a QoS level of a discovery signal.
- f(Tx) Tx (a range of the random number p 1 is [0,Tx]) if a QoS level is “high QoS”
- f(Tx) 1 (a range of the random number p 1 is [0,1]) if a QoS level is “low QoS”.
- Adjustment of the random number p 1 may be performed by the mobile station 200 - 1 .
- FIG. 11 is a flowchart illustrating an operation example in the mobile station 200 - 1 .
- the mobile station 200 - 1 sets a range of the random number p 1 according to a QoS level of a discovery signal (S 31 ).
- the control unit 207 may measure a QoS level based on, for example, a discovery signal received from the mobile station 200 - 2 .
- the control unit 207 sets a range of the random number p 1 according to the QoS level as described above.
- the mobile station 200 - 1 selects a radio resource from a resource pool based on the set range of the random number p 1 , and transmits a discovery signal by using the selected radio resource (S 32 ), and finishes a series of processes (S 33 ).
- FIG. 12 illustrates a hardware configuration example of the base station 100 .
- the base station 100 includes an antenna 110 , a radio frequency (RF) circuit 111 , a processor 112 , a memory 113 , and a network interface (IF) 114 .
- the processor 112 reads a program stored in the memory 113 , and realizes a function of the control unit 104 by executing the program.
- the processor 112 corresponds to, for example, the control unit 104 in the second embodiment.
- the antenna 110 and the RF circuit 111 correspond to, for example, the wireless transmission unit 101 and the wireless reception unit 102 in the second embodiment.
- the memory 113 corresponds to the storage unit 105 in the second embodiment
- the network IF 114 corresponds to the network communication unit 106 in the second embodiment.
- FIG. 13 illustrates a hardware configuration example of the mobile station 200 .
- the mobile station 200 includes an antenna 210 , an RF circuit 211 , a processor 212 , and a memory 213 .
- the processor 212 reads a program stored in the memory 213 , and realizes a function of the control unit 207 by executing the program.
- the processor 212 corresponds to, for example, the control unit 207 in the second embodiment.
- the antenna 210 and the RF circuit 211 correspond to, for example, the first and second wireless transmission units 201 and 204 , and the first and second wireless reception units 202 and 205 in the second embodiment.
- the memory 213 corresponds to the storage unit 208 in the second embodiment.
- the processor 112 and 212 may be, for example, a central processing unit (CPU), a micro processing unit (MPU), or a field programmable gate array (FPGA).
- CPU central processing unit
- MPU micro processing unit
- FPGA field programmable gate array
- the base station 100 or the mobile station 200 may set three threshold values Tx 1 to Tx 3 the QoS levels.
- the base station 100 or the mobile station 200 may set four or more threshold values Tx 1 , Tx 2 , . . . , and Txn (where n is an integer of 4 or greater) according to a QoS level.
- ⁇ Txn may be set in a descending order of a QoS level.
- the number of QoS levels and the number of threshold values Tx may or not be the same as each other.
- the number of threshold values Tx may be two (for example, Tx 1 and Tx 2 ).
- the mobile station 200 may set a plurality of threshold values Tx 1 , Tx 2 , . . . , and Txn based on the threshold value Tx received from the base station 100 such that an average thereof is the threshold value Tx.
- the mobile station 200 adjusts a range of the random number p 1 according to a QoS level.
- the adjustment may be performed by the base station 100 .
- the base station 100 may transmit a range of the random number p 1 to the mobile station 200 , and the mobile station 200 may select a radio resource from a resource pool by using the range of the random number p 1 .
- a range of the random number p 1 is [0,1].
- a range of the random number p 1 may be [0,N] (where N is a number of 1 or greater) such as [0,10] or [0,100].
- the minimum value of the random number p 1 may be a numerical value such as “1” other than “0”.
- a range of the random number p 1 is set to differ according to a QoS level.
- a range of the random number p 1 is set to [0,Tx] in the maximum QoS level, and a range of the random number p 1 is made gradually more spread and closer to [0,1] as a QoS level becomes lower.
- a range of the random number p 1 in the minimum QoS level may be set to [0,1].
- the mobile station 200 performs wireless communication with the base station 100 with the first wireless communication unit 203 , and performs D2D communication with another mobile station with the second wireless communication unit 206 .
- the wireless communication with the base station 100 and the D2D communication with another mobile station may be performed by using, for example, a single wireless communication unit (the first or second wireless communication unit 203 or 206 ).
- the first embodiment and the second embodiment may be combined.
- the first and second wireless communication apparatuses 200 - 1 and 200 - 2 described in the first embodiment may be implemented as the mobile station apparatus 200 described in the second embodiment.
- the third wireless communication apparatus 100 described in the first embodiment may be implemented as the base station apparatus 100 described in the second embodiment. Therefore, the control unit 207 in the first embodiment corresponds to the control unit 207 in the second embodiment, the function of the control unit 207 described in the first embodiment may be realized by the control unit 207 described in the second embodiment, and the function of the control unit 207 described in the second embodiment may also be implemented by the control unit 207 described in the first embodiment.
- the second embodiment and other embodiments may also be combined with each other.
- the base station apparatus 100 and the mobile station apparatus 200 described in the second embodiment may be implemented by the base station apparatus 100 and the mobile station apparatus 200 described in the other embodiments.
- the control unit 104 of the base station apparatus 100 in the second embodiment corresponds to the processor 112 in the other embodiments, and the processor 112 may realize the function of the control unit 104 .
- the control unit 207 of the mobile station apparatus 200 in the second embodiment corresponds to, for example, the processor 212 in the other embodiments, and the processor 212 may realize the function of the control unit 207 .
- the first embodiment and other embodiments may also be combined with each other.
- the first and second wireless communication apparatuses 200 - 1 and 200 - 2 described in the first embodiment may be implemented by the mobile station apparatus 200 described in the other embodiments
- the third wireless communication apparatus 100 described in the first embodiment corresponds to the base station apparatus 100 described in the other embodiments.
- the control unit 207 in the first embodiment corresponds to the processor 212 in the other embodiments
- the processor 212 may realize the function of the control unit 207 .
- the function of the control unit 104 in the first embodiment may be realized by the processor 212 in the other embodiments.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A wireless communication apparatus, for performing wireless communication with a first wireless communication apparatus based on a discovery signal, includes: a control circuit configured to control a probability of using a radio resource for the discovery signal; and a communication circuit configured to transmit the discovery signal to the first wireless communication apparatus through the radio resource in accordance with the probability.
Description
- This application is a continuation application of U.S. patent application Ser. No. 16/025,459 filed on Jul. 2, 2018, which is a continuation of International Application No. PCT/JP2016/050804 filed on Jan. 13, 2016 and designated the U.S., the entire contents of each are incorporated herein by reference.
- The embodiments discussed here are related to a wireless communication apparatus, a wireless communication system, and a processing method.
- Nowadays, the 3rd Generation Partnership Project (3GPP) which is a standardization body has completed or examined specifications of a Long Term Evolution (LTE) system or an LTE-Advanced (LTE-A) system based on the LTE system. 3GPP Release8 to Release12 are formulated as international specifications.
- In 3GPP Release12, Device to Device Proximity Service (ProSe) (service based on terminal proximity; hereinafter referred to as “D2D communication” in some cases) is specified. The D2D communication is, for example, a wireless communication method in which wireless communication is performed between terminals without using a core network. Through the D2D communication, for example, it is possible to reduce a load on the core network or to increase the capacity of a default bandwidth.
- The D2D communication supports two functions such as a discovery function and a direct communication function. The discovery function is, for example, a function of finding a proximity terminal based on transmission and reception of a discovery signal. The direct communication function is, for example, a function of terminals directly performing communication with each other. The discovery function is expected to be mainly used for a commercial service, and the direct communication function is expected to be mainly used for public safety such as police or fire wireless communication. The discovery function in a commercial service may be supposed to be used within a network coverage.
- 3GPP Release12 defines the following two methods as methods of transmitting a discovery signal. The first method is a method in which a base station explicitly allocates a radio resource for transmitting a discovery signal to a terminal, and the terminal transmits a discovery signal by using the radio resource. The second method is a method in which a base station allocates a resource pool to a terminal, and the terminal transmits a discovery signal by using a radio resource selected from the resource pool.
- In a case of the method of using a resource pool, for example, the terminal acquires a random number p1, and can use the resource pool in a case where the acquired random number is smaller than a threshold value (Tx:tx-probability).
FIG. 14 illustrates a relationship example between the random number p1 and the probability P. InFIG. 14 , a transverse axis expresses the random number p1, and a longitudinal axis expresses the probability P. As illustrated inFIG. 14 , a probability of being capable of using the resource pool at values of the random number p1 from “0” to “Tx” is 1/Tx, and theprobability 1/Tx is uniform from “0” to “Tx”. - Examples of the related art include Non-Patent Literature 1 [3GPP TS36.300 V12.5.0 (2015-03)], Non-Patent Literature 2 [3GPP TS36.211 V12.5.0 (2015-03)], Non-Patent Literature 3 [3GPP TS36.212 V12.4.0 (2015-03)], Non-Patent Literature 4 [3GPP TS36.213 V12.5.0 (2015-03)], Non-Patent Literature 5 [3GPP TS36.321 V12.5.0 (2015-03)], Non-Patent Literature 6 [3GPP TS36.322 V12.2.0 (2015-03)], Non-Patent Literature 7 [3GPP TS36.323 V12.3.0 (2015-03)], Non-Patent Literature 8 [3GPP TS36.331 V12.5.0 (2015-03)], Non-Patent Literature 9 [3GPP TS36.413 V12.5.0 (2015-03)], Non-Patent Literature 10 [3GPP TS36.423 V12.5.0 (2015-03)], Non-Patent Literature 11 [3GPP TR36.842 V12.0.0 (2013-12)], and Non-Patent Literature 12 [3GPP TR36.843 V12.0.1 (2014-03)].
- According to an aspect of the invention, a wireless communication apparatus, for performing wireless communication with a first wireless communication apparatus based on a discovery signal, includes: a control circuit configured to control a probability of using a radio resource for the discovery signal; and a communication circuit configured to transmit the discovery signal to the first wireless communication apparatus through the radio resource in accordance with the probability.
- The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed.
-
FIG. 1 illustrates a configuration example of a wireless communication system; -
FIG. 2 illustrates a configuration example of the wireless communication system; -
FIG. 3 illustrates a configuration example of a base station apparatus; -
FIG. 4 illustrates a configuration example of a mobile station apparatus; -
FIGS. 5A and 5B illustrate examples of probability distributions; -
FIG. 6 illustrates an example in which the mobile station apparatus transmits a priority value; -
FIG. 7 is a sequence diagram illustrating an operation example; -
FIG. 8 illustrates an example of a probability distribution; -
FIG. 9 is a sequence diagram illustrating an operation example; -
FIGS. 10A and 10B illustrate examples of probability distributions; -
FIG. 11 is a flowchart illustrating an operation example; -
FIG. 12 illustrates a hardware configuration example of the base station apparatus; -
FIG. 13 illustrates a hardware configuration example of the mobile station apparatus; and -
FIG. 14 illustrates an example of a probability distribution. - However, in the method of using a resource pool, in a case where the acquired random number p1 exceeds the threshold value Tx even if a quality of service (QoS) level is more than a predetermined value, the terminal may not use the resource pool. In a case where the acquired random number p1 smaller the threshold value Tx even if the QoS level is equal to or less than the predetermined value, the terminal may use the resource pool. In this case, since the QoS level is less than the predetermined value, even if a discovery signal is transmitted, the terminal may not find other terminals, and thus may not performed D2D communication.
- According to the present disclosure, provided are technologies for improving service quality in a wireless communication apparatus, a wireless communication system, and a processing method.
- Hereinafter, the present embodiment will be described in detail with reference to the drawings. The object and the embodiment in the present application are only examples, and do not limit the scope of rights of the present application. Particularly, even if there is a difference between disclosed expressions, the technique of the present application can be applied to even a differing expression as long as the expression provides a technical equivalent, and the scope of rights is not limited.
- Terms used in the present specification or technical contents disclosed in the present specification may appropriately employ terms or technical contents disclosed in specifications as standards regarding communication in the 3GPP or the like. Examples of the specifications include the above
Non-Patent Literatures 1 to 12. - The above
Non-Patent Literatures 1 to 12 may be used in terms of the date, but are updated at any time, and thus terms or technical contents disclosed in the aboveNon-Patent Literatures 1 to 12 issued right before the filing date of the present application may be appropriately used in the specification of the present application. - A summary disclosed in each document from
Non-Patent Literature 1 to Non-Patent Literature 12 is as follows. - In other words, Non-Patent Literature 1 (3GPP TS36.300 V12.5.0 (2015-03)) discloses, for example, a summary specification of LTE-Advanced.
- Non-Patent Literature 2 (3GPP TS36.211 V12.5.0 (2015-03)) discloses, for example, a physical layer (PHY) channel (or a physical channel) specification of LTE-A.
- Non-Patent Literature 3 (3GPP TS36.212 V12.4.0 (2015-03)) discloses, for example, a PHY encoding specification of LTE-A.
- Non-Patent Literature 4 (3GPP TS36.213 V12.5.0 (2015-03)) discloses, for example, a PHY procedure specification of LTE-A.
- Non-Patent Literature 5 (3GPP TS36.321 V12.5.0 (2015-03)) discloses, for example, a Medium Access Control (MAC) specification of LTE-A.
- Non-Patent Literature 6 (3GPP TS36.322 V12.2.0 (2015-03)) discloses, for example, a Radio Link Control (RLC) specification of LTE-A.
- Non-Patent Literature 7 (3GPP TS36.323 V12.3.0 (2015-03)) discloses, for example, a Packet Data Convergence Protocol (PDCP) specification of LTE-A.
- Non-Patent Literature 8 (3GPP TS36.331 V12.5.0 (2015-03)) discloses, for example, a Radio Resource Control (RRC) specification of LTE-A.
- Non-Patent Literature 9 (3GPP TS36.413 V12.5.0 (2015-03)) discloses, for example, an S1 specification of LTE-A.
- Non-Patent Literature 10 (3GPP TS36.423 V12.5.0 (2015-03)) discloses, for example, an X2 specification of LTE-A.
- Non-Patent Literature 11 (3GPP TR36.842 V12.0.0 (2013-12)) is, for example, an examination note for a small cell technique of LTE-A.
- Non-Patent Literature 12 (3GPP TR36.843 V12.0.1 (2014-03)) is, for example, an examination note for a D2D communication technique.
- A first embodiment will be described.
FIG. 1 is a diagram illustrating a configuration example of awireless communication system 10 in the first embodiment. Thewireless communication system 10 includes first to third wireless communication apparatuses 200-1, 200-2, and 100. - The first wireless communication apparatus 200-1 and the second wireless communication apparatus 200-2 perform wireless communication based on a discovery signal. For example, the first and second wireless communication apparatuses 200-1 and 200-2 perform D2D communication. The first wireless communication apparatus 200-1 performs wireless communication with the third
wireless communication apparatus 100. - The first and third wireless communication apparatuses 200-1 or 100 respectively include
control units control units control unit 207 controls a probability of using a radio resource for a discovery signal, information regarding the controlled probability may be output to acommunication unit 206. In a case where thecontrol unit 104 controls a probability of using a radio resource for a discovery signal, information regarding the controlled probability may be output to thecommunication unit 206. - The first wireless communication apparatus 200-1 includes the
communication unit 206. Thecommunication unit 206 uses a radio resource according to a radio resource usage probability controlled by thecontrol unit - As mentioned above, in the first embodiment, the first or third wireless communication apparatus 200-1 or 100 controls a probability of using a discovery signal. Consequently, for example, it is possible to avoid a situation in which the first wireless communication apparatus 200-1 may not transmit a discovery signal in a case where a QoS level of the discovery signal is high. For example, it is possible to avoid a situation in which the first wireless communication apparatus 200-1 repeatedly transmits a discovery signal many times in a case where a QoS level of the discovery signal is low. Therefore, in the
wireless communication system 10, it is possible to improve service quality for a discovery signal, and further service quality for D2D communication. - Next, a second embodiment will be described.
- Configuration Example of Wireless Communication System
-
FIG. 2 illustrates a configuration example of awireless communication system 10. Thewireless communication system 10 includes a base station apparatus (hereinafter, referred to as a “base station” in some cases) 100, and mobile station apparatuses (hereinafter, referred to as “mobile stations” in some cases) 200-1 and 200-2. - The
base station 100 is, for example, a wireless communication apparatus which performs wireless communication with the mobile stations 200-1 and 200-2 located in a service area of the base station. - Each of the mobile stations 200-1 and 200-2 is, for example, a wireless communication apparatus such as a smart phone, a feature phone, a tablet terminal, a personal computer, or a game apparatus. The mobile stations 200-1 and 200-2 may perform wireless communication with the
base station 100 so as to be provided with various services such as a call service or a web page viewing service. - The mobile stations 200-1 and 200-2 may perform D2D communication. The D2D communication is a communication method specified as Device to Device Proximity Service (ProSe) (service based on terminal proximity) in 3GPP Release12.
- In the second embodiment, the mobile stations 200-1 and 200-2 performs D2D communication using the discovery function. In the D2D communication using the discovery function, for example, the mobile station 200-1 transmits and receives a discovery signal (or an inter-terminal finding signal) so as to find another mobile station 200-2, and the D2D communication is performed between the mobile stations 200-1 and 200-2. For example, the discovery signal is a signal used to find the peripheral mobile station 200-2 in order for the mobile station 200-1 to perform the D2D communication.
- The mobile stations 200-1 and 200-2 receive parameter information such as a synchronization signal or a radio resource from the
base station 100. The mobile stations 200-1 and 200-2 perform the D2D communication based on the received parameter information. The parameter information also includes a radio resource for a discovery signal. The radio resource for a discovery signal has several candidates in a resource pool, and, for example, the mobile station 200-1 transmits a discovery signal by using a radio resource in the resource pool. The mobile stations 200-1 and 200-2 may transmit a discovery signal by using the Physical Sidelink Discovery Channel (PSDCH). - The
base station 100 may perform a notification of (or may perform broadcast transmission of) parameter information regarding the D2D communication by using the System Information Block (SIB) 18 or the SIB19. The SIB18 includes D2D communication parameter information using the direct communication function, and the SIB19 includes D2D communication parameter information using the discovery function. - The
base station 100 and the mobile stations 200-1 and 200-2 can perform bidirectional wireless communication. In other words, communication in a direction (hereinafter, referred to as a “downlink (DL) direction” in some cases) from thebase station 100 toward the mobile stations 200-1 and 200-2 and communication in a direction (hereinafter, referred to as an “uplink (UL) direction” in some cases) from the mobile stations 200-1 and 200-2 toward thebase station 100 can be performed. - In this case, the
base station 100 performs scheduling with respect to wireless communication in a downlink direction and an uplink direction with the mobile stations 200-1 and 200-2, so as to allocate a radio resource or to determine an encoding method or a modulation method. Thebase station 100 transmits a control signal including scheduling information indicating a scheduling result to the mobile stations 200-1 and 200-2. Thebase station 100 and the mobile stations 200-1 and 200-2 perform wireless communication according to the scheduling information included in the control signal. - The mobile stations 200-1 and 200-2 may perform the D2D communication by using, for example, a radio resource allocated from the
base station 100 when the mobile stations 200-1 and 200-2 perform wireless communication in an uplink direction. - In the
wireless communication system 10 illustrated inFIG. 2 , an example in which two mobile stations 200-1 and 200-2 are under the control of thebase station 100 is illustrated, but the number of mobile stations may be three or more, and the respective mobile stations may perform the D2D communication with each other. - In the
wireless communication system 10 illustrated inFIG. 2 , an example is illustrated in which the two mobile stations 200-1 and 200-2 performing the D2D communication are located within a cell range (or a service providing range) of thebase station 100. For example, one of the two mobile stations 200-1 and 200-2 performing the D2D communication may be located within the cell range of thebase station 100, and the other may be located out of the cell range. Alternatively, the mobile stations 200-1 and 200-2 may be moved from the cell range of thebase station 100 to the outside of the cell range, and may perform the D2D communication. A configuration example of thewireless communication system 10 may appropriately employ, for example, scenarios written in specifications regarding the D2D communication, including the above non-patent literatures. - The mobile stations 200-1 and 200-2 have the same configuration, and thus will be described as a
mobile station 200 unless otherwise mentioned. - Configuration Example of Base Station Apparatus
- Next, a description will be made of a configuration example of the
base station 100.FIG. 3 is a diagram illustrating a configuration example of thebase station 100. Thebase station 100 includes awireless transmission unit 101, awireless reception unit 102, thecontrol unit 104, astorage unit 105, and anetwork communication unit 106. Thewireless transmission unit 101 and thewireless reception unit 102 may be included in a wireless communication unit (or communication unit) 103. - The
wireless transmission unit 101 performs, for example, an error correction coding (ECC) process (hereinafter, referred to as an “encoding process” in some cases), a modulation process, and a frequency conversion process on data read from thestorage unit 105 or a control signal output from thecontrol unit 104, so as to convert the data or the control signal into a radio signal. Thewireless transmission unit 101 transmits the radio signal after conversion to themobile station 200. - The
wireless reception unit 102 receives, for example, a radio signal transmitted from themobile station 200. Thewireless reception unit 102 performs a frequency conversion process, a demodulation process, or an error correction decoding process (hereinafter, referred to as a “decoding process” in some cases) on the received radio signal, so as to extract data or a control signal. Thewireless reception unit 102 outputs the extracted data or control signal to thestorage unit 105 or thecontrol unit 104. - The
control unit 104 performs the scheduling, and outputs a result thereof to thewireless transmission unit 101 or thewireless reception unit 102 as scheduling information. Thecontrol unit 104 generates a control signal including the scheduling information, and outputs the control signal to thewireless transmission unit 101. The control signal is transmitted to themobile station 200. Thewireless transmission unit 101 or thewireless reception unit 102 transmits or visitor a radio signal according to the scheduling information. - The
control unit 104 generates parameter information including information regarding a resource pool for a discovery signal transmitted and received between the mobile stations 200-1 and 200-2, information regarding a synchronization signal, and the like. The parameter information is used for the mobile stations 200-1 and 200-2 to perform the D2D communication. Thecontrol unit 104 outputs the generated parameter information to thewireless transmission unit 101. In this case, thecontrol unit 104 may instruct thewireless transmission unit 101 to transmit the parameter information as notification information. - The
control unit 104 controls a probability that the mobile stations 200-1 and 200-2 may use a radio resource for a discovery signal. Specifically, thecontrol unit 104 controls allocation of a radio resource for a discovery signal according to a QoS level. Details thereof will be described later. - The
storage unit 105 stores, for example, information regarding data or a control signal, and information regarding a resource pool. For example, thewireless reception unit 102, thecontrol unit 104, or thenetwork communication unit 106 stores data or a control signal in thestorage unit 105 as appropriate. For example, thewireless transmission unit 101, thecontrol unit 104, or thenetwork communication unit 106 may read information regarding the data or the control signal stored in thestorage unit 105 as appropriate, and may generate scheduling information or parameter information. - The
network communication unit 106 is connected to another apparatus, and transmits and transmits data or the like to and from another apparatus. In this case, thenetwork communication unit 106 converts data into packet data with a format which can be output to another apparatus, or extracts data or the like from packet data received from another data so as to output the data or the like to thestorage unit 105 or thecontrol unit 104. An example of another apparatus may be another base station, the Mobility Management Entity (MME), or the Serving Gateway (SGW). - Configuration Example of Mobile Station Apparatus
-
FIG. 4 is a diagram illustrating a configuration example of themobile station 200. Themobile station 200 includes a firstwireless transmission unit 201, a first wireless reception unit 202, a secondwireless transmission unit 204, a second wireless reception unit 205, thecontrol unit 207, and astorage unit 208. The firstwireless transmission unit 201 and the first wireless reception unit 202 may be included in a first wireless communication unit (or a first communication unit) 203. The secondwireless transmission unit 204 and the second wireless reception unit 205 may be included in a second wireless communication unit (or a second communication unit) 206. The firstwireless communication unit 203 is used for wireless communication with thebase station 100, and the secondwireless communication unit 206 is used for D2D communication with other mobile stations. - The first
wireless transmission unit 201 performs, for example, an encoding process, a modulation process, and a frequency conversion process on data read from thestorage unit 208 or a control signal output from thecontrol unit 207, so as to convert the data or the control signal into a radio signal. The firstwireless transmission unit 201 transmits the radio signal to thebase station 100. - The first wireless reception unit 202 receives the radio signal transmitted from the
base station 100. The first wireless reception unit 202 performs a frequency conversion process, a demodulation process, or a decoding process on the received radio signal, so as to extract data, a control signal, or parameter information used for the D2D communication from the radio signal. The first wireless reception unit 202 outputs the extracted data, control signal, or parameter information to thecontrol unit 207 or thestorage unit 208. - The second
wireless transmission unit 204 performs, for example, an encoding process, a modulation process, and a frequency conversion process on a discovery signal output from thecontrol unit 207 or data read from thestorage unit 208, so as to convert the discovery signal or the data into a radio signal. The secondwireless transmission unit 204 transmits the radio signal to other mobile stations performing the D2D communication. - The second wireless reception unit 205 receives the radio signal transmitted from another mobile station. The second wireless reception unit 205 performs a frequency conversion process, a demodulation process, or an encoding process on the received radio signal, so as to extract a discovery signal or data from the radio signal. The second wireless reception unit 205 outputs, for example, the extracted discovery signal or data to the
control unit 207 or thestorage unit 208. - The
control unit 207 receives a control signal from the first wireless reception unit 202, extracts scheduling information or the like from the control signal, and outputs the scheduling information or the like to the firstwireless transmission unit 201 or the first wireless reception unit 202. The firstwireless transmission unit 201 and the first wireless reception unit 202 transmits a radio signal to thebase station 100 or visitor a radio signal transmitted from thebase station 100 according to the scheduling information included in the control signal. - The
control unit 207 receives parameter information from the first wireless reception unit 202, and outputs the received parameter information to the secondwireless transmission unit 204 or the second wireless reception unit 205. The secondwireless transmission unit 204 and the second wireless reception unit 205 performs the D2D communication with another mobile station based on the parameter information. - The
control unit 207 controls a probability of using a radio resource for a discovery signal. Specifically, thecontrol unit 207 controls allocation of a radio resource for a discovery signal according to a QoS level. Details thereof will be described later. - The
control unit 207 may acquire a random number p1 within a predetermined numerical value range, may determine that a radio signal for a discovery signal in a resource pool is used in a case where the acquired random number p1 is equal to or less than a threshold value, and may determine that the resource pool is unable to be used in a case where the random number p1 is more than the threshold value. In this case, thecontrol unit 207 notifies the secondwireless transmission unit 204 or the second wireless reception unit 205 of the determination, and the secondwireless transmission unit 204 and the second wireless reception unit 205 transmit discovery signals according to the determination. - The
storage unit 208 stores, for example, information regarding data or a control signal or information regarding a resource pool. For example, the first and second wireless reception units 202 and 205 or thecontrol unit 207 may store data or a control signal in thestorage unit 208 as appropriate, and the first and secondwireless transmission units control unit 207 may read information regarding the data or the control signal stored in thestorage unit 208 as appropriate. - Operation Example
- Next, a description will be made of an operation example. A description will be made of an operation example with reference to
FIGS. 5A to 11 . - In the D2D communication, a radio resource used to transmit or receive a discovery signal is selected from a resource pool. In this case, the
mobile station 200 acquires the random number p1, can use the resource pool when the random number p1 is equal to or less than a threshold value Tx, and is unable to use the resource pool when the random number p1 is more than the threshold value Tx. In this case, as described above in the example illustrated inFIG. 14 , the random number p1 appears as a value from “0” to “Tx”, and a probability of being capable of using a resource pool is uniform as 1/Tx. - In contrast, in the second embodiment, there are the following two operation examples. The first operation example is an example in which a value of the threshold value Tx is adjusted according to a QoS level.
FIG. 5A illustrates an example of a probability distribution. InFIG. 5A , a transverse axis expresses the random number p1, and the longitudinal axis expresses the probability P. As illustrated inFIG. 5A , a threshold value is set to Tx1 in a case where a QoS level is “high QoS”, and a threshold value is set to Tx2 (<Tx1) in a case where a QoS level is “low QoS”. In this case, with respect to the threshold value Tx inFIG. 14 , the threshold value Tx1 may be Tx1>Tx, and the threshold value Tx2 may be Tx2<Tx. As mentioned above, in the second embodiment, the threshold value Tx is set to be different threshold values Tx1 and Tx2 according to a QoS level. - For example, in
FIG. 5A , when an area of a quadrangle formed by the threshold value Tx1 and the probability P=1/Tx1 thereof is compared with an area of a quadrangle formed by the threshold value Tx and the probability P=1/Tx inFIG. 14 , the former is larger than the latter. Therefore, a probability that the acquired random number p1 is equal to or less than the threshold value Tx1 is higher than in a case of the uniform distribution. Therefore, in a case where a QoS level is “high QoS”, a probability of being capable of using a resource pool is higher than in a case of the uniform distribution, and, thus, in themobile station 200, a probability of transmitting a discovery signal by using the resource pool can also be made higher than in a case of the uniform distribution. - On the other hand, for example, in
FIG. 5A , when an area of a quadrangle formed by the threshold value Tx2 and the probability P=1/Tx2 thereof is compared with an area of a quadrangle formed by the threshold value Tx and the probability P=1/Tx inFIG. 14 , the former is smaller than the latter. Therefore, a probability that the acquired random number p1 is equal to or less than the threshold value Tx2 is lower than in a case of the uniform distribution (for example,FIG. 14 ). Therefore, in a case where a QoS level is “low QoS”, a probability of being capable of using a resource pool in themobile station 200 is lower than in a case of the uniform distribution, and, thus, a resource pool may not be used, and thus a discovery signal may not be transmitted. - As mentioned above, since a probability of using a discovery signal is controlled, it is possible to avoid a situation in which a discovery signal may not be transmitted in a case where a QoS level is high and a situation in which a discovery signal is repeatedly transmitted many times in a case where a QoS level is low. Therefore, in the
wireless communication system 10, it is possible to improve service quality for a discovery signal, and further service quality for D2D communication. Details of the first operation example will be described later. - The second operation example is an example in which the probability P that the threshold value Tx may appear as the random number p1 is determined by a function which does not depend on a uniform distribution.
FIG. 5B illustrates an example of a log-normal distribution as an example of such a function. InFIG. 5B , a transverse axis expresses the random number p1, and a longitudinal axis expresses the probability P. For example, the probability P that “0.5” may appear as the random number p1 is highest, and the probability that the random number p1 may appear becomes gradually lower as a distance from “0.5” increases. For example, in a case where a value acquired as the random number p1 is “0.5” (a value appearing most) at the threshold value Tx of “0.6”, the value is equal to or smaller than the threshold value Tx, and, thus, themobile station 200 can use a resource pool. On the other hand, in a case where a value acquired as the random number p1 is “0.7”, the value is greater than the threshold value Tx, and thus themobile station 200 is unable to use a resource pool. - In this case, a range of the random number p1 is set according to a QoS level of a discovery signal. For example, when a QoS level is “high QoS”, a range of the random number p1 is set to [0,Tx] (a range in which the minimum value is “0”, and the maximum value is “Tx”), and when a QoS level is “low QoS”, a range of the random number p1 is set to [0,1] (a range in which the minimum value is “0”, and the maximum value is “1”). The random number p1 acquired in the range of [0,Tx] of the random number p1 is equal to or less than the threshold value Tx, and, in a case of “high QoS”, the
mobile station 200 can use a resource pool. On the other hand, the random number p1 acquired in the range of [0,1] of the random number p1 may be more than the threshold value Tx, and, in a case of “low QoS”, themobile station 200 may be unable to use a resource pool. - Also in the second operation example, since a probability of using a discovery signal is controlled, it is possible to avoid a situation in which a discovery signal may not be transmitted in a case where a QoS level is high and a situation in which a discovery signal is repeatedly transmitted many times in a case where a QoS level is low. Therefore, in the
wireless communication system 10, it is possible to improve service quality for a discovery signal, and further service quality for D2D communication. - Next, details of the first operation example and the second operation example will be described in this order.
- (1) Operation Example in Case where a Value of Threshold Value Tx is Adjusted According to QoS Level
- As this operation example, there are an example in which the
base station 100 sets the threshold values Tx1 and Tx2, and an example in which themobile station 200 sets the threshold values Tx1 and Tx2. Hereinafter, the examples will be described in order. - (1-1) Example in which
Base Station 100 Sets Threshold Values Tx1 and Tx2 -
FIG. 6 illustrates a configuration example of thewireless communication system 10 in this operation example, andFIG. 7 is a sequence diagram illustrating this operation example. In the current specification, the mobile station 200 (the mobile station 200-1 in the example illustrated inFIG. 6 ) notifies thebase station 100 of a total number of discovery signals. In the second embodiment, the mobile station 200-1 transmits a QoS level in addition to a total number of discovery signals (S10 inFIG. 7 ). The mobile station 200-1 may transmit a priority value to thebase station 100 as an index indicating the QoS level. For example, in a case where the QoS level is “high QoS”, the priority value is “High”, and, in a case where the QoS level is “low QoS”, the priority value is “Low”. As the priority value, a numerical value such as “0” or “1” may be used instead of “High” or “Low”. - For example, the mobile station 200-1 performs the following process. In other words, the second wireless reception unit 205 measures QoS based on a radio resource transmitted from another mobile station (for example, the mobile station 200-2) performing the D2D communication or data included in the radio resource, and outputs a result thereof to the
control unit 207. The radio resource transmitted from another mobile station also includes a discovery signal. As an index of the QoS, for example, there are a throughput (or a data amount or a packet amount per unit time), a packet loss, delay time, radio resource reception power, a signal to interference and noise ratio (SINR), and a carrier to interference and noise ratio (CINR). The QoS may be performed by thecontrol unit 207 instead of the second wireless reception unit 205. Thecontrol unit 207 determines a priority value corresponding to a QoS level based on a table or the like stored in thestorage unit 208, and outputs the priority value to the firstwireless transmission unit 201 along with a total number of discovery signals. Consequently, the priority value is transmitted from the firstwireless transmission unit 201 to thebase station 100. - In a case where a total number of discovery signals and the priority value are received, the
base station 100 sets the threshold values Tx1 and Tx2 according to the received priority value (S11). For example, in a case where the priority value transmitted from the mobile station 200-1 is received, thewireless reception unit 102 outputs the priority value to thecontrol unit 104, and thecontrol unit 104 sets the threshold values Tx1 and Tx2 according to the priority value. As described above, thecontrol unit 104 sets the threshold value Tx1 for a numerical value of which the priority value indicates “high QoS”, and sets the threshold value Tx2 for a numerical value of which the priority value indicates “low QoS”. - The
base station 100 transmits the set threshold values Tx1 and Tx2 to the mobile station 200-1 (S12). In this case, thebase station 100 may perform broadcast transmission (or a notification) of SIB19 including the threshold values Tx1 and Tx2, and may separately transmit the threshold values Tx1 and Tx2 to the mobile station 200-1. For example, in a case where two threshold values Tx1 and Tx2 are set, thecontrol unit 104 outputs the threshold values Tx1 and Tx2 to thewireless transmission unit 101. The threshold values Tx1 and Tx2 are transmitted from thewireless transmission unit 101 to thebase station 100. For example, the threshold values Tx1 and Tx2 are information regarding probabilities thereof in a case where thebase station 100 controls the probabilities that the mobile station 200-1 may use a resource pool for a discovery signal. - The mobile station 200-1 selects a radio resource from a resource pool based on the threshold values Tx1 and Tx2, and transmits a discovery signal by using the selected radio resource (S13). For example, in a case where the threshold values Tx1 and Tx2 are received via the first wireless reception unit 202, the
control unit 207 selects a radio resource from the resource pool by using either of the threshold values Tx1 and Tx2 according to the QoS level. Since the information regarding the resource pool is received by the mobile station 200-1 by using, for example, SIB19, and is stored in thestorage unit 208, thecontrol unit 207 may read the information regarding the resource pool from thestorage unit 208 as appropriate, and may acquire the random number p1 as described above so as to select a radio resource. - (1-2) Example in which
Mobile Station 200 Sets Threshold Values Tx1 and Tx2 -
FIG. 8 illustrates an example of setting the threshold values Tx1 and Tx2, andFIG. 9 illustrates a sequence example in this operation example. In this operation example, themobile station 200 receives the threshold value Tx (for example, the threshold value Tx inFIG. 14 ) transmitted from thebase station 100, and autonomously sets two threshold values Tx1 and Tx2 based on the threshold value Tx. In this case, themobile station 200 may set the threshold values Tx1 and Tx2 such that an average of the threshold values Tx1 and Tx2 is the threshold value Tx. This is so that, for example, themobile station 200 handles a probability of using a resource pool not differently from a system of the related art but as equally thereto as possible. - As illustrated in
FIG. 9 , thebase station 100 transmits the threshold value Tx (S20). In this case, thebase station 100 may transmit the threshold value Tx by using SIB19, and may separately transmit the threshold value Tx to the mobile station 200-1. For example, thecontrol unit 104 reads the threshold value Tx from thestorage unit 105 and outputs the threshold value Tx to thewireless transmission unit 101, and the threshold value Tx is transmitted from thewireless transmission unit 101 to the mobile station 200-1. - Next, the mobile station 200-1 autonomously sets the threshold values Tx1 and Tx2 such that an average of the two threshold values Tx1 and Tx2 is the threshold value Tx (S21). For example, the
control unit 207 receives the threshold value Tx from the first wireless reception unit 202, and sets the threshold values Tx1 and Tx2 such that a value (or an average) obtained by dividing a result of adding the threshold values Tx1 and Tx2 together by “2” is the threshold value Tx. - In the same manner as in S13, the mobile station 200-1 selects a radio resource from the resource pool based on the threshold values Tx1 and Tx2 according to the QoS level, and transmits a discovery signal by using the selected radio resource (S22).
- (2) Operation Example in Case where Probability P that Threshold Value Tx May Appear is Determined by Function which does not Depend on Uniform Distribution
-
FIGS. 10A and 10B illustrate examples of distributions in this operation example.FIGS. 10A and 10B illustrate examples of log-normal distributions, but any function or distribution may be used, for example, except for a uniform distribution. For example, an n-th order function (where n is an integer of 1 or greater) such as a linear function or a quadratic function, a triangular distribution, a binomial distribution, a Poisson distribution, and a geometric distribution may be used. -
FIG. 10B illustrates an example in which a range of the random number p1 is set according to a QoS level of a discovery signal. InFIG. 10B , f(Tx)=Tx (a range of the random number p1 is [0,Tx]) if a QoS level is “high QoS”, and f(Tx)=1 (a range of the random number p1 is [0,1]) if a QoS level is “low QoS”. Adjustment of the random number p1 may be performed by the mobile station 200-1. -
FIG. 11 is a flowchart illustrating an operation example in the mobile station 200-1. In a case where a process is started (S30), the mobile station 200-1 sets a range of the random number p1 according to a QoS level of a discovery signal (S31). For example, in the same manner as in S10, thecontrol unit 207 may measure a QoS level based on, for example, a discovery signal received from the mobile station 200-2. Thecontrol unit 207 sets a range of the random number p1 according to the QoS level as described above. - The mobile station 200-1 selects a radio resource from a resource pool based on the set range of the random number p1, and transmits a discovery signal by using the selected radio resource (S32), and finishes a series of processes (S33).
-
FIG. 12 illustrates a hardware configuration example of thebase station 100. Thebase station 100 includes anantenna 110, a radio frequency (RF)circuit 111, aprocessor 112, amemory 113, and a network interface (IF) 114. Theprocessor 112 reads a program stored in thememory 113, and realizes a function of thecontrol unit 104 by executing the program. Theprocessor 112 corresponds to, for example, thecontrol unit 104 in the second embodiment. Theantenna 110 and theRF circuit 111 correspond to, for example, thewireless transmission unit 101 and thewireless reception unit 102 in the second embodiment. For example, thememory 113 corresponds to thestorage unit 105 in the second embodiment, and the network IF 114 corresponds to thenetwork communication unit 106 in the second embodiment. -
FIG. 13 illustrates a hardware configuration example of themobile station 200. Themobile station 200 includes anantenna 210, anRF circuit 211, aprocessor 212, and a memory 213. Theprocessor 212 reads a program stored in the memory 213, and realizes a function of thecontrol unit 207 by executing the program. Theprocessor 212 corresponds to, for example, thecontrol unit 207 in the second embodiment. Theantenna 210 and theRF circuit 211 correspond to, for example, the first and secondwireless transmission units storage unit 208 in the second embodiment. - The
processor - In the second embodiment, in the example of setting different threshold values Tx1 and Tx2 according to a QoS level, a description has been made of an example of setting two threshold values Tx1 and Tx2. For example, in a case where there are three QoS levels, the
base station 100 or themobile station 200 may set three threshold values Tx1 to Tx3 the QoS levels. For example, thebase station 100 or themobile station 200 may set four or more threshold values Tx1, Tx2, . . . , and Txn (where n is an integer of 4 or greater) according to a QoS level. In this case, Tx1<Tx2< . . . <Txn may be set in a descending order of a QoS level. The number of QoS levels and the number of threshold values Tx may or not be the same as each other. For example, even in a case where the number of QoS levels is three (for example, a high level, a low level, and a normal level), the number of threshold values Tx may be two (for example, Tx1 and Tx2). In this case, themobile station 200 may set a plurality of threshold values Tx1, Tx2, . . . , and Txn based on the threshold value Tx received from thebase station 100 such that an average thereof is the threshold value Tx. - In the second embodiment, a description has been made of an example in which the
mobile station 200 adjusts a range of the random number p1 according to a QoS level. For example, the adjustment may be performed by thebase station 100. In this case, thebase station 100 may transmit a range of the random number p1 to themobile station 200, and themobile station 200 may select a radio resource from a resource pool by using the range of the random number p1. - In the second embodiment, a description has been made of an example in which a range of the random number p1 is [0,1]. For example, a range of the random number p1 may be [0,N] (where N is a number of 1 or greater) such as [0,10] or [0,100]. The minimum value of the random number p1 may be a numerical value such as “1” other than “0”.
- In the second embodiment, a description has been made of an example in which a range of the random number p1 is set to differ according to a QoS level. In this case, for example, a range of the random number p1 is set to [0,Tx] in the maximum QoS level, and a range of the random number p1 is made gradually more spread and closer to [0,1] as a QoS level becomes lower. A range of the random number p1 in the minimum QoS level may be set to [0,1].
- In the second embodiment, a description has been made of an example in which the
mobile station 200 performs wireless communication with thebase station 100 with the firstwireless communication unit 203, and performs D2D communication with another mobile station with the secondwireless communication unit 206. The wireless communication with thebase station 100 and the D2D communication with another mobile station may be performed by using, for example, a single wireless communication unit (the first or secondwireless communication unit 203 or 206). - The above-described respective embodiments may be combined with each other in any form. For example, the following combination may be used.
- In other words, the first embodiment and the second embodiment may be combined. In this case, the first and second wireless communication apparatuses 200-1 and 200-2 described in the first embodiment may be implemented as the
mobile station apparatus 200 described in the second embodiment. The thirdwireless communication apparatus 100 described in the first embodiment may be implemented as thebase station apparatus 100 described in the second embodiment. Therefore, thecontrol unit 207 in the first embodiment corresponds to thecontrol unit 207 in the second embodiment, the function of thecontrol unit 207 described in the first embodiment may be realized by thecontrol unit 207 described in the second embodiment, and the function of thecontrol unit 207 described in the second embodiment may also be implemented by thecontrol unit 207 described in the first embodiment. - The second embodiment and other embodiments may also be combined with each other. In this case, the
base station apparatus 100 and themobile station apparatus 200 described in the second embodiment may be implemented by thebase station apparatus 100 and themobile station apparatus 200 described in the other embodiments. In this case, thecontrol unit 104 of thebase station apparatus 100 in the second embodiment corresponds to theprocessor 112 in the other embodiments, and theprocessor 112 may realize the function of thecontrol unit 104. Thecontrol unit 207 of themobile station apparatus 200 in the second embodiment corresponds to, for example, theprocessor 212 in the other embodiments, and theprocessor 212 may realize the function of thecontrol unit 207. - The first embodiment and other embodiments may also be combined with each other. In this case, the first and second wireless communication apparatuses 200-1 and 200-2 described in the first embodiment may be implemented by the
mobile station apparatus 200 described in the other embodiments, and the thirdwireless communication apparatus 100 described in the first embodiment corresponds to thebase station apparatus 100 described in the other embodiments. Therefore, thecontrol unit 207 in the first embodiment corresponds to theprocessor 212 in the other embodiments, and theprocessor 212 may realize the function of thecontrol unit 207. The function of thecontrol unit 104 in the first embodiment may be realized by theprocessor 212 in the other embodiments. - All examples and conditional language recited herein of the RFID tag and the high frequency circuit are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
Claims (20)
1. A wireless communication apparatus for performing wireless communication with a first wireless communication apparatus, the wireless communication apparatus comprising:
a control circuit configured to control a probability of mapping a signal to a radio resource within a resource pool that is usable for transmitting the signal, according to a quality of service (QoS), the QoS being required communication service quality between the wireless communication apparatus and the first wireless communication apparatus; and
a communication circuit configured to transmit the signal via the radio resource.
2. The wireless communication apparatus according to claim 1 ,
wherein the signal is a discovery signal being used for discovering by the first wireless communication apparatus.
3. The wireless communication apparatus according to claim 1 ,
wherein the QoS in the controlling of the probability is a quality of service (QoS) level or a priority of the signal.
4. The wireless communication apparatus according to claim 1 ,
wherein the QoS in the controlling of the probability is a quality of service (QoS) level or a priority of the discovery signal.
5. The wireless communication apparatus according to claim 1 ,
wherein the control circuit is further configured to set a first threshold in accordance with the QoS, and control the probability according to a quality of service (QoS) and the first threshold.
6. The wireless communication apparatus according to claim 1 , wherein the QoS in the controlling of the probability is a quality of service (QoS) level of the signal, and
the control circuit is further configured to set a first threshold and a second threshold in accordance with the QoS level.
7. The wireless communication apparatus according to claim 6 ,
wherein the control circuit is further configured to set the first threshold in a case where the QoS level is a first level, and set the second threshold smaller than the first threshold in a case where the QoS level is a second level lower than the first level.
8. The wireless communication apparatus according to claim 6 , wherein the control circuit is further configured to receive information indicating the first threshold and the second threshold from a second wireless communication.
9. The wireless communication apparatus according to claim 7 ,
wherein the control circuit is further configured to:
determine that the radio resource for the signal is used when an acquired random number is equal to or less than the first threshold in a case where the QoS level is the first level, and
determine that the radio resource for the signal is used if the acquired random number is equal to or less than the second threshold in a case where the QoS level is the second level, and
wherein the communication circuit is configured to transmit the signal according to the determination.
10. The wireless communication apparatus according to claim 9 ,
wherein the communication circuit is configured to receive a third threshold transmitted from the second wireless communication apparatus, and
wherein the control circuit is configured to set the first and second threshold such that an average of the first and second threshold is the third threshold.
11. The wireless communication apparatus according to claim 8 ,
wherein the communication circuit is configured to transmit a priority value indicating the QoS level to the second wireless communication apparatus.
12. The wireless communication apparatus according to claim 8 ,
wherein the communication circuit is configured to transmit a total number of the signal and a priority value indicating the QoS level to the second wireless communication apparatus.
13. The wireless communication apparatus according to claim 1 ,
wherein the control circuit is configured to
acquire a random number, and
set a probability of using a radio resource for the discovery signal to different probabilities according to the random number.
14. The wireless communication apparatus according to claim 13 ,
wherein the control circuit is configured to control a range of the random number which can be acquired according to a QoS level of the signal.
15. The wireless communication apparatus according to claim 14 ,
wherein the control circuit is configured to
execute first processing when the QoS level is a first level, the first processing including setting a range of the random number to a range from the minimum value to a value which is equal to or smaller than a threshold, and
executing second processing when the QoS level is a second level lower than the first level, the second processing including setting a range of the random number to a range from the minimum value to the maximum value.
16. The wireless communication apparatus according to claim 1 ,
wherein the controlling of the probability by the control circuit is configured to autonomously determine the probability of the signal in accordance with the QoS and to cause the communication circuit to transmit the signal by mapping the signal to the radio resource within the resource pool in accordance with the probability determined by the control circuit of the wireless communication apparatus
17. A wireless communication apparatus performing wireless communication with a first wireless communication apparatus, the wireless communication apparatus comprising:
a control circuit configured to control a probability of mapping a signal to a radio resource within a resource pool that is usable for transmitting the signal; and
a communication circuit configured to enable information regarding the probability to be transmitted to the first wireless communication apparatus, wherein
the probability is a probability that the first wireless communication apparatus maps the signal to transmit to a second wireless to the resource according to a quality of service (QoS), the QoS being required communication service quality between the first wireless communication apparatus and the second wireless communication apparatus.
18. The wireless communication apparatus according to claim 17 , wherein the communication circuit is further configured to transmit information indicating a first threshold and a second threshold in accordance with the QoS, to the first wireless communication.
19. The wireless communication apparatus according to claim 18 ,
wherein the first threshold in a case where the QoS level is a first level, and the second threshold smaller than the first threshold in a case where the QoS level is a second level lower than the first level.
20. A wireless communication system comprising:
a first wireless communication apparatus;
a second wireless communication apparatus configured to perform wireless communication based on a signal; and
a third wireless communication apparatus configured to perform wireless communication with the first wireless communication apparatus,
wherein the first or third wireless communication apparatus is further configured to:
control a probability of mapping a signal to a radio resource within a resource pool that is usable for transmitting the signal, according to a quality of service (QoS), the QoS being required communication service quality between the first wireless communication apparatus and the second wireless communication apparatus; and
transmit the signal via the radio resource to the second wireless communication apparatus.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/096,842 US20210068093A1 (en) | 2016-01-13 | 2020-11-12 | Wireless communication apparatus, wireless communication system, and processing method |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2016/050804 WO2017122290A1 (en) | 2016-01-13 | 2016-01-13 | Wireless communication device, wireless communication system, and processing method |
US16/025,459 US10863482B2 (en) | 2016-01-13 | 2018-07-02 | Wireless communication apparatus, wireless communication system, and processing method |
US17/096,842 US20210068093A1 (en) | 2016-01-13 | 2020-11-12 | Wireless communication apparatus, wireless communication system, and processing method |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/025,459 Continuation US10863482B2 (en) | 2016-01-13 | 2018-07-02 | Wireless communication apparatus, wireless communication system, and processing method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20210068093A1 true US20210068093A1 (en) | 2021-03-04 |
Family
ID=59311712
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/025,459 Active US10863482B2 (en) | 2016-01-13 | 2018-07-02 | Wireless communication apparatus, wireless communication system, and processing method |
US17/096,842 Abandoned US20210068093A1 (en) | 2016-01-13 | 2020-11-12 | Wireless communication apparatus, wireless communication system, and processing method |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/025,459 Active US10863482B2 (en) | 2016-01-13 | 2018-07-02 | Wireless communication apparatus, wireless communication system, and processing method |
Country Status (3)
Country | Link |
---|---|
US (2) | US10863482B2 (en) |
JP (1) | JP6583435B2 (en) |
WO (1) | WO2017122290A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115967963A (en) * | 2018-10-23 | 2023-04-14 | 苹果公司 | Measurement gap enhancement |
CN114223289B (en) * | 2019-08-16 | 2023-04-11 | 中兴通讯股份有限公司 | Method, apparatus, and computer-readable medium for wireless communication |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160255615A1 (en) * | 2013-10-31 | 2016-09-01 | Intel IP Corporation | Resource allocation for d2d discovery in an lte network |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2978456B2 (en) | 1997-06-23 | 1999-11-15 | 株式会社ワイ・アール・ピー移動通信基盤技術研究所 | Wireless packet transmission system |
US8953478B2 (en) | 2012-01-27 | 2015-02-10 | Intel Corporation | Evolved node B and method for coherent coordinated multipoint transmission with per CSI-RS feedback |
CN104429130B (en) * | 2012-07-05 | 2018-06-26 | Lg电子株式会社 | It is sent in a wireless communication system for the method and its device of the terminal detection signal of direct communication between terminal |
JP2015035695A (en) | 2013-08-08 | 2015-02-19 | Kddi株式会社 | Communication system, base station device, terminal device, communication method and program |
JP2015035712A (en) * | 2013-08-08 | 2015-02-19 | Kddi株式会社 | Radio base station device, radio terminal device, radio communication system, inter-terminal direct communication control method, and computer program |
JP6019005B2 (en) | 2013-10-31 | 2016-11-02 | 株式会社Nttドコモ | Wireless base station, user terminal, and wireless communication method |
EP3110192B1 (en) * | 2014-03-11 | 2018-05-09 | Huawei Technologies Co., Ltd. | Resource selection for discovering devices |
-
2016
- 2016-01-13 JP JP2017561102A patent/JP6583435B2/en active Active
- 2016-01-13 WO PCT/JP2016/050804 patent/WO2017122290A1/en active Application Filing
-
2018
- 2018-07-02 US US16/025,459 patent/US10863482B2/en active Active
-
2020
- 2020-11-12 US US17/096,842 patent/US20210068093A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160255615A1 (en) * | 2013-10-31 | 2016-09-01 | Intel IP Corporation | Resource allocation for d2d discovery in an lte network |
Also Published As
Publication number | Publication date |
---|---|
JP6583435B2 (en) | 2019-10-02 |
US20180310295A1 (en) | 2018-10-25 |
WO2017122290A1 (en) | 2017-07-20 |
US10863482B2 (en) | 2020-12-08 |
JPWO2017122290A1 (en) | 2018-11-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11765070B2 (en) | Event trigger for independent links | |
US11013065B2 (en) | Downlink interference management method, base station, and user equipment | |
US11582736B2 (en) | Communication method and apparatus and communication system | |
US20210068093A1 (en) | Wireless communication apparatus, wireless communication system, and processing method | |
US11943774B2 (en) | System and method for indicating a first set and a second set of uplink channel transmission parameters | |
CN113545143B (en) | Hybrid multi-panel uplink precoding with dynamic and semi-persistent scheduling | |
CN113711522A (en) | Efficient signaling of rate matching patterns | |
CN116803046A (en) | Method for partial frequency detection using sounding reference signal | |
CN116830772A (en) | Simultaneous Transmit and Receive (STR) multilink operation | |
CN116325638A (en) | Multislot reference signal triggering using reference signal identification | |
CN116746110A (en) | Flexible triggering method of aperiodic SRS | |
US20180270833A1 (en) | Interference management for multiuser in-coverage device to device communication |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FUJITSU LIMITED, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OHTA, YOSHIAKI;AIKAWA, SHINICHIRO;ODE, TAKAYOSHI;SIGNING DATES FROM 20180611 TO 20180619;REEL/FRAME:054354/0635 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: APPLICATION DISPATCHED FROM PREEXAM, NOT YET DOCKETED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |