JP2010114525A - Radio communication system, communication device, radio communication method and radio communication program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allocate random access signals to an appropriate band even when the communication conditions or the like of respective mobile station apparatuses are different, and to improve the success rate of connection by random access or the communication efficiency of signals other than the random access signals. <P>SOLUTION: The communication device for allocating the random access signals in a determined band and transmitting them includes: a band allocation pattern determination part for determining a plurality of band allocation patterns which are the combination of the bands and in which the sizes of the combined bands are different from each other; and a band allocation pattern-reporting part for reporting the information of the band allocation pattern determined by the band allocation pattern determination part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless communication system, a communication apparatus, a wireless communication method, and a wireless communication program.

  In recent years, third-generation mobile communication systems (3G: The 3rd Generation) including the W-CDMA (Wideband-Code Division Multiple Access) method has been widely used worldwide, but at present, to realize further high-speed communication. Next generation mobile communication systems are being studied. As a next-generation mobile communication system, a fourth-generation mobile communication system (4G: The 4th Generation) having a downlink communication speed of 100 Mbps to 1 Gbps has been studied, but there is a great difference in system configuration between 3G and 4G.

  Therefore, in order to fill the technical and time gap between 3G and 4G and realize a smooth transition to 4G, we introduced the same technology as 3G and introduced a new technology that is a candidate for 4G. In addition, E-UTRA (Evolved Universal Terrestrial Radio Access) that realizes a downlink communication speed of about 100 Mbps is actively discussed in 3GPP (The 3rd Generation Partnership Project: 3rd Generation Partnership Project).

In E-UTRA, an OFDMA (Orthogonal Frequency Division Multiplexing Access) scheme has been proposed as a downlink. In addition, a technique called AMC (Adaptive Modulation and Coding: adaptive modulation system, also expressed as Link Adaptation in 3GPP) that adaptively changes a plurality of modulation schemes and coding rates, A MIMO (Multiple Input Multiple Output) transmission system that transmits and receives data using a plurality of antennas is employed.

For RACH (Random Access Channel: Random Access Channel) for setting a radio communication line, in 3G, the transmission timing of the random access signal is the random access subchannel and SFN (System Frame Number: subframe number) transmitted from the radio base station. Determined from.
In LTE (Long Term Evolution: 3GPP evolution), the position of a RACH slot to which a random access signal can be allocated within a radio frame is defined by 16 types of RACH slot configuration (RACH slot pattern). The base station apparatus transmits information indicating which RACH slot pattern is used in the cell to the terminal (mobile station apparatus) as broadcast information.
The terminal that has received the broadcast information recognizes the timing at which RACH can be transmitted from the received information, and when communication is required, transmits a random access preamble signal (random access signal) at the timing of the RACH slot defined by the RACH slot pattern. To do.

Non-Patent Document 1 describes a new RACH slot pattern.
On the other hand, Patent Document 1 describes a method for assigning an uplink random access channel in a radio access network.

Further, Patent Document 2 obtains a propagation loss, receives an uplink slot occupation state and an interference amount from a base station, obtains a desired wave power from the propagation loss, and obtains the occupation wave from the desired wave power and the interference amount. A slot selection method is described in which a ratio of desired wave power to interference amount in each slot in which the situation is empty is obtained, and a transmission slot is selected using the ratio of desired wave power to interference amount.
3GPP R1-074026, Random Access E-mail Reflector Summary, Motorola, RAN1 # 50-bis JP 2006-333404 A JP 2001-136570 A

However, in the conventional technology, since the determination of the allocation of the random access signal is uniformly performed for all mobile station apparatuses, depending on the communication status of each mobile station apparatus, the random access signal is more than necessary. May be allocated, or a band necessary for a random access signal may not be allocated.
When a band more than necessary is allocated to a random access signal, a band used for transmitting a signal other than the random access signal is reduced, and there is a disadvantage that communication efficiency of signals other than the random access signal is reduced. On the other hand, when a necessary band is not allocated to the random access signal, there is a drawback that the success rate of connection by random access is lowered.
As described above, according to the conventional technology, depending on the communication status of each mobile station device, the random access signal is not assigned to an appropriate band, and the success rate of connection by random access or communication of signals other than the random access signal is performed. There was a drawback that the efficiency decreased.

  The present invention has been made in view of the above points, and its purpose is to allow random access signals to be allocated to appropriate bands even if the communication status of each mobile station apparatus is different, and to connect by random access. It is an object of the present invention to provide a wireless communication system, a communication device, a wireless transmission method, and a wireless transmission program that can improve the success rate or the communication efficiency of signals other than random access signals.

(1) The present invention has been made to solve the above-described problems, and one aspect thereof is a first communication device that allocates and transmits a random access signal in a predetermined band, and the communication device. And a second communication device that receives a random access signal transmitted from the first communication device, wherein the first communication device is a band allocation pattern that is a combination of the bands, A bandwidth allocation pattern determination unit for determining a bandwidth allocation pattern from among the plurality of bandwidth allocation patterns having different sizes, and a bandwidth allocation pattern notification for notifying information on the bandwidth allocation pattern determined by the bandwidth allocation pattern determination unit And a bandwidth allocation for allocating the random access signal in a bandwidth of the bandwidth allocation pattern determined by the bandwidth allocation pattern determination unit And the second communication device receives the information on the bandwidth allocation pattern notified from the bandwidth allocation pattern notification unit of the first communication device, and uses the bandwidth of the bandwidth allocation pattern, A wireless communication system comprising a receiving unit that receives a random access signal from a first communication device.
According to the above configuration, in the wireless communication system, the first communication device determines the bandwidth allocation pattern, notifies the determined bandwidth allocation pattern to the second communication device, and the second communication device Since the random access signal from the first communication device is received using the bandwidth allocation pattern notified from the first communication device, each of the first communication devices sets the bandwidth allocation pattern under different determination conditions. The random access signal can be assigned to an appropriate band even if the communication status of each of the first communication devices is different, and the success rate of connection by random access or other than the random access signal The signal communication efficiency can be improved.

  (2) Further, according to one aspect of the present invention, a plurality of first communication apparatuses that allocate and transmit a random access signal in a predetermined band, and a random access signal transmitted from the communication apparatus are received. In the wireless communication system comprising two communication apparatuses, the first communication apparatus is a band allocation pattern that is a combination of the bands, and the plurality of band allocations having different combined band sizes. Among the patterns, a band allocation pattern determination unit that determines a band allocation pattern, a band allocation pattern notification unit that reports information on the band allocation pattern determined by the band allocation pattern determination unit, and correction of the second communication device The correction band allocation pattern information notified from the band allocation pattern notification unit is received, and the random access is included in the band of the correction band allocation pattern. The second communication device based on information on the bandwidth allocation pattern notified from the bandwidth allocation pattern notification unit of the plurality of first communication devices. A correction band allocation pattern determination unit that determines a correction band allocation pattern that is a band allocation pattern used by each of the communication apparatuses, and a correction band allocation pattern that notifies information on the correction band allocation pattern determined by the correction band allocation pattern determination unit And a notification unit.

  (3) Further, according to one aspect of the present invention, the band allocation pattern determination unit determines the band allocation pattern based on information indicating a transmission speed of information that can be transmitted by the first communication device. A wireless communication system.

  (4) Further, according to one aspect of the present invention, the first communication device is a communication service other than the random access signal with respect to the second communication device. The wireless communication system is characterized in that communication of different types of communication services is performed, and the bandwidth allocation pattern determination unit determines the bandwidth allocation pattern based on information indicating the type of the communication service scheduled to be communicated.

  (5) According to another aspect of the present invention, the first communication device communicates with the second communication device using a communication band that is a predetermined band, and a band allocation pattern determination unit Is a radio communication system characterized in that the band allocation pattern is determined based on information indicating the size of the communication band.

  (6) According to another aspect of the present invention, the bandwidth allocation pattern determination unit determines the bandwidth allocation pattern based on quality information of communication between the first communication device and the second communication device. Is a wireless communication system.

  (7) Further, according to one aspect of the present invention, the first communication device transmits control information used for communication control and user information other than the control information to the second communication device, and allocates bandwidth. The pattern determination unit is a wireless communication system characterized in that the band allocation pattern is determined based on information indicating an information amount of the user information.

  (8) Further, according to one aspect of the present invention, the bandwidth allocation pattern determination unit determines the bandwidth allocation pattern based on information indicating a success rate of communication of the random access signal. It is.

  (9) Moreover, one aspect of the present invention is a wireless communication system in which the band allocation pattern determination unit determines the band allocation pattern based on battery voltage information of the first communication device.

  (10) In a communication apparatus that allocates and transmits a random access signal in a predetermined band, a band allocation pattern that is a combination of the bands, and a plurality of the bands whose sizes of the combined bands are different from each other A communication apparatus comprising: a band allocation pattern determination unit that determines an allocation pattern; and a band allocation pattern notification unit that notifies information on a band allocation pattern determined by the band allocation pattern determination unit.

  (11) Further, according to one aspect of the present invention, there is further provided an aspect of the present invention in which a wireless access method in a communication apparatus that allocates and transmits a random access signal in a predetermined band is the communication apparatus, A band allocation pattern which is a combination of bands, wherein a first step of determining a plurality of band allocation patterns having different combined band sizes, and the communication device in the first step And a second process of notifying information on the determined bandwidth allocation pattern.

  (12) According to another aspect of the present invention, there is provided a band allocation pattern that is a combination of the bands to a computer of a communication apparatus that allocates and transmits a random access signal in a predetermined band, and the combined band A radio that functions as a band allocation pattern determining unit that determines a plurality of band allocation patterns having different sizes, and a band allocation pattern notifying unit that notifies information on the band allocation pattern determined by the band allocation pattern determining unit It is a transmission program.

  According to the present invention, the wireless communication system is a band allocation pattern that is a combination of bands in which the first communication device allocates a random access signal, and a plurality of band allocations whose sizes of the combined bands are different from each other. A bandwidth allocation pattern is determined from the patterns, the determined bandwidth allocation pattern is notified to the second communication device, and the second communication device uses the bandwidth allocation pattern notified from the first communication device, Since a random access signal from one communication device is received, each first communication device can determine a band allocation pattern under different determination conditions, and even if the communication status of each first communication device is different. , Random access signals can be assigned to appropriate bands, success rate of connection by random access, or other than random access signals It is possible to improve the efficiency of communication signals.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram of a communication system according to the first embodiment of the present invention.
In this figure, a mobile phone device A1 (first communication device) is located in a cell of a base station device B1 (second communication device) and communicates with the base station device B1. Here, the cell is a range in which the base station device can communicate with the mobile phone device, and the in-zone is that the identification information of the mobile phone device is registered in the base station device by cell search or the like, A state in which the registered mobile phone device is communicable.
In addition, the mobile phone device A2 and the mobile phone device A3 are located in the cell of the base station device B2, and communicate with the base station device B2. Thus, the base station device may communicate with a plurality of mobile phone devices.

  In the present embodiment, the downlink from the base station apparatus B1 (B2) to the mobile phone apparatus A1 (A2, A3) includes the downlink shared channel PDSCH (Physical Downlink Shared Channel), the broadcast channel PBCH (Physical Broadcast Channel), and multicast. Channel PMCH (Physical Multicast Channel), Control Format Notification Channel PCFICH (Physical Control Format Indicator Channel), Downlink Control Channel PDCCH (Physical Downlink Control Channel HIC, HAR Channel ID Channel) by the constructed.

  The uplink from the cellular phone device A1 (A2, A3) to the base station device B1 (B2) includes a random access channel PRACH (Physical Random Access Channel), an uplink shared channel PUSCH (Physical Uplink Shared Channel), and an uplink. It is configured by a control channel PUCCH (Physical Uplink Control Channel).

  The base station device B1 (B2) is a mobile phone device in the cell of the base station device B1 (B2) (cell phone device A1 in the case of the base station device B1, cell phone in the case of the base station device B2). The device is in a state of receiving a random access signal assigned to the random access channel RACH from the devices A2, A3).

Hereinafter, the random access channel RACH according to the present embodiment will be described with reference to FIGS. 2 and 3.
FIG. 2 is a schematic diagram illustrating an example of a RACH slot pattern table according to the present embodiment.

  As shown in the figure, the RACH slot pattern table is a two-dimensional tabular data composed of rows and columns, and includes items of a pattern number, a random access (RA) cycle, and a random access (RA) subframe number. Has a column. The primary key of this RACH slot pattern table is a pattern number.

The random access period is a period represented by the number of subframes at a predetermined time interval, and the random access subframe number is a number in which the subframes are ordered within the period, as will be described later.
The data in each row of the RACH slot pattern table represents a band combination pattern (RACH slot configuration) to which a random access signal can be allocated, and this is called a RACH slot pattern (band allocation pattern).

FIG. 3 is an explanatory diagram for explaining a RACH slot pattern according to the present embodiment.
This figure shows an uplink radio resource configuration, with time on the horizontal axis and frequency on the vertical axis. In this figure, radio resources are divided into subframes each having a predetermined time interval in the horizontal axis (time axis) direction, and given with random access subframe numbers corresponding to random access cycles. Further, the radio resources are divided at predetermined frequency intervals in the vertical axis (frequency axis) direction.

The band is represented by a radio resource delimited in this figure. For example, there are a frequency band delimited by a time interval, a time band delimited by a frequency interval, and a band delimited by a time interval and a frequency interval.
In this figure, the hatched band is a band to which a random access signal can be assigned (hereinafter referred to as a RACH slot).

  For example, in FIG. 2, the RACH slot pattern with pattern number “0” is the pattern shown in FIG. FIG. 3A shows that subframe numbers 0 to 19 are assigned to each subframe for each random access period “20” in the radio resource. Also, FIG. 3A shows that in the radio resource, the RACH slot is the band with the highest frequency of the subframe with the random access subframe number “4”.

  Similarly, FIG. 3B is a RACH slot pattern of pattern number “1” in FIG. 2, and the RACH slot is a subframe of random access subframe number “4” every random access period “10”. It shows that the band with the highest frequency and the band with the lowest frequency are repeated.

  FIG. 3C shows the RACH slot pattern with the pattern number “2” in FIG. 2, and the RACH slot is the largest of the subframes with the random access subframe number “2” for each random access period “5”. It shows that the pattern of two bands with a high frequency and two bands with the lowest frequency are repeated.

Comparing FIG. 3 (a), FIG. 3 (b) and FIG. 3 (c), for example, for the 20 subframes from the top in the figure, the number of RACH slots is 1, 2 and 4 respectively. It is a piece.
The RACH slot pattern shown in FIG. 3A has a smaller number of RACH slots within a unit time than the RACH slot pattern shown in FIG. In addition, the RACH slot pattern shown in FIG. 3C has a larger number of RACH slots per unit time than the RACH slot pattern shown in FIG.
That is, the RACH slot pattern indicated by the RACH slot pattern table is a plurality of RACH slot patterns in which the number of RACH slots (band size) within a unit time is different from each other.

  FIG. 4 is a schematic block diagram showing the configuration of the wireless communication system according to the present embodiment. As illustrated, the wireless communication system includes a mobile phone device a1 that is the mobile phone device A1 in FIG. 1 and a base station device b1 that is the base station device B1 in FIG.

First, the mobile phone device a1 will be described.
The cellular phone device a1 includes an antenna unit a10, a receiving unit a11, a storage unit a12, a control unit a13, and a transmitting unit a14. In addition, the cellular phone device a1 has other generally known functions of the cellular phone device.

The reception unit a11 down-converts the reception signal input from the reception antenna of the antenna unit a10 from a radio frequency signal to a baseband signal, and then converts the data converted into a digital signal by analog / digital conversion to the control unit a13. Output.
The control unit a13 controls each unit of the mobile phone device a1. In addition, the control unit a13 inputs and outputs the audio signal after interposing conversion between the data and the audio signal with respect to a speaker unit, a microphone unit, and the like (not shown) of the mobile phone device a1.
The control unit a13 includes a data transfer efficiency detection unit a130, a RACH slot pattern determination unit a131, a RACH slot allocation unit a132 (band allocation unit), a random access signal generation unit a133, and a RACH slot pattern notification unit a134 (band allocation pattern notification unit). ).

  The data transfer efficiency detection unit a130 measures the data transfer efficiency (unit: bits per second) and detects the maximum value of a predetermined time as the maximum data transfer efficiency (transmission speed of information that can be transmitted). However, the present invention is not limited to this, and when the mobile phone device a1 and the base station device b1 are used for MIMO (Multiple-Input Multiple-Output) communication, they are determined based on the number of antennas used for MIMO communication. The maximum data transfer efficiency may be set as the maximum data transfer efficiency, or the maximum data transfer efficiency predetermined by the function or standard of the mobile phone device a1 may be set as the maximum data transfer efficiency.

The RACH slot pattern determination unit a131 stores in advance the correspondence between the maximum data transfer efficiency and the pattern number of the RACH slot pattern, and the pattern number corresponding to the maximum data transfer efficiency detected by the data transfer efficiency detection unit a130 is stored in the RACH slot pattern. Determined as pattern number.
Here, the correspondence between the maximum data transfer efficiency and the pattern number of the RACH slot pattern corresponds to the pattern number of the RACH slot pattern having a larger band as the maximum data transfer efficiency increases.

For example, the RACH slot pattern determination unit a131 selects the RACH slot pattern “1” with less bandwidth allocation, for example, when the device itself does not support MIMO communication. On the other hand, the RACH slot pattern determination unit a131 selects the RACH slot pattern “2” when the own apparatus supports MIMO communication and there are two antennas used for communication between the own apparatus and the base station apparatus b1. In addition, when the number of antennas used for communication between the own apparatus and the base station apparatus b1 is three, the RACH slot pattern “3” is selected.
For example, the RACH slot pattern determination unit a131 selects the RACH slot pattern “1” with less bandwidth allocation when, for example, the own device is a mobile phone device with a low maximum data transfer efficiency dedicated to a voice terminal. Further, the RACH slot pattern determination unit a131 determines the RACH slot pattern “3” with increased bandwidth allocation when the device is a mobile phone device that is required to have high maximum data transfer efficiency specialized for high-speed data communication. Select.

The RACH slot allocation unit a132 allocates a random access signal to the RACH slot according to the pattern number of the RACH slot pattern determined by the RACH slot pattern determination unit a131.
That is, the RACH slot allocation unit a132 allocates a random access signal in any RACH slot of the RACH slot pattern determined by the RACH slot pattern determination unit a131.

  The random access signal generation unit a133 generates a random access signal, and transmits the random access signal to the base station apparatus b1 via the transmission antennas of the transmission unit a14 and the antenna unit a10 using the band allocated by the RACH slot allocation unit a132.

  The RACH slot pattern notifying unit a134 notifies the base station apparatus b1 of the pattern number (band allocation pattern information) of the RACH slot pattern determined by the RACH slot pattern determining unit a131.

The storage unit a12 includes a RACH slot pattern candidate storage unit a121 and a band allocation information storage unit a122. The RACH slot pattern candidate storage unit a121 stores the above-described RACH slot pattern table (FIG. 2).
The bandwidth allocation information storage unit a122 stores the allocation information (RACH slot pattern pattern number) determined by the RACH slot pattern determination unit a131, and uses this stored data to store the RACH slot allocation unit of the control unit. a132 performs RACH slot bandwidth allocation.

  The transmission unit a14 converts data that is a digital signal input from the control unit a13 into an analog signal by digital / analog conversion, up-converts the data as a transmission signal to a radio frequency signal, and sets the transmission antenna of the antenna unit a10. To the base station apparatus b1. Further, the transmission unit a14 transmits the pattern information of the RACH slot pattern determined by the RACH slot pattern determination unit a131 to the base station apparatus b1.

Next, the base station apparatus b1 will be described.
The base station apparatus b1 includes an antenna unit b10, a reception unit b11, a storage unit b12, a control unit b13, and a transmission unit b14. In addition, the base station apparatus b1 has other generally known functions of the base station apparatus.

The receiving unit b11 down-converts the received signal including the random access signal and the band allocation information input from the receiving antenna of the antenna unit b10 from a radio frequency signal to a baseband signal, and then converts the signal into a digital signal by analog / digital conversion. The converted data is output to the control unit b13.
The storage unit b12 includes a RACH slot pattern candidate storage unit b121 (band allocation pattern candidate storage unit) and a band allocation information storage unit b122 that stores the band allocation information transmitted from the mobile phone device a1. .

The RACH slot pattern candidate storage unit b121 stores the above-described RACH slot pattern table (FIG. 2).
The band allocation information storage unit b122 stores the band allocation pattern information (RACH slot pattern pattern number) of the random access signal notified from each mobile phone device a1.

The control part b13 controls each part of the base station apparatus b1. In addition, data is input / output with a communication unit or the like of the base station device b1 (not shown).
The control unit b13 prepares to receive a random access signal based on the band allocation pattern information of the random access signal notified from the mobile phone device a1.

FIG. 5 is a flowchart showing an example of the operation of the wireless communication system according to the present embodiment.
First, the mobile phone device a1 detects the maximum data transfer efficiency of the mobile phone device a1 stored in advance (S101).
Next, the cellular phone device a1 determines the pattern number of the RACH slot pattern corresponding to the maximum data transfer efficiency detected in S101. (S102)
Next, the cellular phone device a1 stores the pattern number of the RACH slot pattern determined in S102 in the band allocation information storage unit a122 (S103).

Next, the cellular phone device a1 notifies the base station device b1 of the pattern number of the RACH slot pattern determined in S102 (S104).
The cellular phone device a1 allocates a random access signal to the RACH slot band of the RACH slot pattern having the pattern number determined in S102 (S105).
Thereafter, the cellular phone device a1 transmits a random access signal using the slot assigned in S105, and the base station device b1 uses the slot of the RACH slot pattern of the pattern number notified in S104 to The random access signal from a1 is received (S106).

  As described above, according to the present embodiment, in the wireless communication system, the mobile phone device a1 determines the RACH slot pattern from the plurality of RACH slot patterns, and the determined RACH slot pattern is transmitted to the base station device b1. Notice. In the wireless communication system, since the base station device b1 receives a random access signal from the mobile phone device a1 using the RACH slot pattern notified from the mobile phone device a1, each mobile phone device a1 has different determination conditions. Can determine the RACH slot pattern, and even if the mobile phone device a1 has different communication conditions, the random access signal can be assigned to an appropriate band, the success rate of connection by random access, or random Communication efficiency of signals other than access signals can be improved.

(Second Embodiment)
The second embodiment of the present invention will be described below with reference to the drawings.
In the first embodiment, the wireless communication system determines the RACH slot pattern based on the maximum data transfer efficiency of the mobile phone device a1.
In the wireless communication system according to the present embodiment, communication of a plurality of types of communication services with different communication speeds is performed, and the RACH slot pattern is determined based on the communication service used by the mobile phone device. The conceptual diagram of the communication system according to the present embodiment is the same as FIG. 1 of the first embodiment.

FIG. 6 is a schematic block diagram showing the configuration of the wireless communication system according to the second embodiment of the present invention. As illustrated, the wireless communication system includes a mobile phone device a2 that is the mobile phone device A1 in FIG. 1 and a base station device b1 that is the base station device B1 in FIG.
When the wireless communication system according to the present embodiment (FIG. 6) is compared with the wireless communication system according to the first embodiment (FIG. 4), the base station apparatus b1 has the same function as that of the first embodiment. A description of the station device b1 is omitted.

Hereinafter, the mobile phone device a2 will be described.
When the cellular phone device a2 (FIG. 6) according to the present embodiment is compared with the cellular phone device a1 (FIG. 4) according to the first embodiment, the storage unit a22 and the control unit a23 are different. However, the functions of other components (antenna unit a10, reception unit a11, and transmission unit a14) are the same as those in the first embodiment, and thus the description of the same functions as those in the first embodiment is omitted.

The storage unit a22 includes a RACH slot pattern candidate storage unit a121, a band allocation information storage unit a122, and a service information band allocation storage unit a223. Since the functions of the RACH slot pattern candidate storage unit a121 and the bandwidth allocation information storage unit a122 are the same as those in the first embodiment, the description thereof is omitted.
The service information band allocation storage unit a223 stores a service information file in which a service type (communication service type) is associated with a pattern number of a RACH slot pattern.

FIG. 7 shows an example of a service information file stored in the service information bandwidth allocation storage unit a223. The service information file in FIG. 7 includes items of service type and pattern number. For example, the service information file in FIG. 7 indicates that the pattern number “1” is associated with the service type “voice service” to be used.
In addition, the service information file of FIG. 7 has a pattern number “1” associated with “voice service” with respect to “data communication service (high speed)” indicating a service type for performing high-speed data communication in the data communication service. Compared to the RACH slot pattern, the number of RACH slots per unit time is large, that is, the pattern number “3” of the RACH slot pattern having a large band is associated.
As described above, in the service information file, the pattern number of the RACH slot pattern having a larger band is associated with the service having a higher data transfer efficiency.

In FIG. 6, the control unit a23 includes a service type detection unit a230, a RACH slot pattern determination unit a231, a RACH slot allocation unit a132 (band allocation unit), a random access signal generation unit a133, and a RACH slot pattern notification unit a134. Composed.
Since the functions of the RACH slot allocation unit a132, the random access signal generation unit a133, and the RACH slot pattern notification unit a134 are the same as those in the first embodiment, the description thereof is omitted.

  The service type detection unit a230 reads the service type used by its own device from the upper layer and outputs it to the RACH slot pattern determination unit a231. The upper layer in this case is the RRC layer or the MAC layer of the mobile phone device a2.

  The RACH slot pattern determination unit a231 determines the pattern number corresponding to the service type input from the service type detection unit a230 as the pattern number of the RACH slot pattern in the service information file stored in the service information band allocation storage unit a223. .

For example, when the service type “voice call” is input from the service type detection unit a230, the RACH slot pattern determination unit a231 changes the RACH slot pattern to the pattern number “1” corresponding to “voice call service” in FIG. The RACH slot pattern is determined.
Further, when the service type “data communication service” is input from the service type detection unit a230, the RACH slot pattern determination unit a231 determines the RACH slot pattern with the pattern number “3”.
That is, the RACH slot pattern determination unit a231 determines a RACH slot pattern from the RACH slot patterns stored in the service information band allocation storage unit a223 based on the service to be used.

FIG. 8 is a flowchart showing an example of the operation of the wireless communication system according to the present embodiment.
First, the cellular phone device a2 detects the service type (S201).
Next, the cellular phone device a2 refers to the service information file (FIG. 7), and determines the RACH slot pattern number corresponding to the service type detected in S201 (S202).

Next, the cellular phone device a2 stores the pattern number of the RACH slot pattern determined in S202 in the band allocation information storage unit a122 (S203).
Next, the mobile phone device a2 notifies the base station device b1 of the pattern number of the RACH slot pattern determined in S202 (S204).

The cellular phone device a2 assigns a random access signal to the RACH slot band of the RACH slot pattern having the pattern number determined in S203 (S205).
Thereafter, the mobile phone device a2 transmits the random access signal using the slot assigned in S205, and the base station device b1 sets the slot of the RACH slot pattern of the pattern number notified in S204. The random access signal is received from the mobile phone device a3 (S206).

  As described above, according to the present embodiment, in the radio communication system, the mobile phone device a2 determines the RACH slot pattern from the plurality of RACH slot patterns, and notifies the base station device b1 of the determined RACH slot pattern. To do. Further, in the wireless communication system, since the base station device b1 receives the random access signal from the mobile phone device a2 using the RACH slot pattern notified from the mobile phone device a2, each mobile phone device a2 has a different determination. RACH slot pattern can be determined under conditions, even if the communication status of each mobile phone device a2 is different, a random access signal can be assigned to an appropriate band, the success rate of connection by random access, or Communication efficiency of signals other than the random access signal can be improved.

<Modification>
In the second embodiment, the mobile phone device a2 determines the RACH slot pattern based on the service type such as voice service or data communication service. However, the mobile phone device a2 uses the frequency bandwidth used for the service by the mobile phone device a2. The RACH slot pattern may be determined.
For example, the RACH slot pattern is switched between when the cellular phone device a2 uses a narrow frequency band and when it uses a wide frequency band.

Hereinafter, modified examples of the present embodiment will be described with reference to FIGS. 9 and 10.
FIG. 9 is a schematic block diagram illustrating a configuration of a wireless communication system according to a modification of the present embodiment.
Comparing the wireless communication system (FIG. 9) according to the present modification with the wireless communication system according to the second embodiment (FIG. 10), the frequency band allocation storage unit a2231, the frequency band detection unit a2301, and the RACH slot pattern determination unit a2311 is different. However, other constituent elements (base station apparatus b1, reception unit a11, transmission unit a14, band allocation information storage unit a122, RACH slot allocation unit a132, random access signal generation unit a133, and RACH slot pattern notification unit a134) have. Since the function is the same as that of the second embodiment, description of the same function as that of the second embodiment is omitted.

The frequency band allocation storage unit a2231 stores a frequency band information file in which a frequency band is associated with a pattern number.
FIG. 10 shows an example of a service information file stored in the service information bandwidth allocation storage unit a223.

The frequency band information file in FIG. 10 is composed of items of frequency band and pattern number. For example, the frequency band information file in FIG. 7 indicates that the pattern number “1” is associated with the frequency band “1.25 MHz or more and less than 5 MHz”.
In addition, the frequency band information file of FIG. 10 is within the unit time for the frequency band “20 MHz or more” as compared to the RACH slot pattern of the pattern number “1” associated with “1.25 MHz or more and less than 5 MHz”. This indicates that the number of RACH slots, that is, the pattern number “4” of the RACH slot pattern having a large band is associated.

In FIG. 9, the frequency band detection unit a2301 reads the service type used by the own device, which is notified in advance from the base station device b1 and stored in advance, and outputs it to the RACH slot pattern determination unit a2311.
The RACH slot pattern determination unit a2311 determines the pattern number corresponding to the service type input from the frequency band detection unit a2301 as the pattern number of the RACH slot pattern in the frequency band information file stored in the frequency band allocation storage unit a2231. .

For example, when “1.5 MHz” is input from the frequency band detection unit a2301, the RACH slot pattern determination unit a2311 selects the RACH slot pattern of the pattern number “1” corresponding to the voice call service in FIG. To decide.
Further, when “20 MHz” is input from the frequency band detection unit a2301, the RACH slot pattern determination unit a2311 determines the RACH slot pattern to be the RACH slot pattern of the pattern number “4” corresponding to the voice call service in FIG. To do.
That is, the RACH slot pattern determination unit a2311 determines a RACH slot pattern from the RACH slot patterns stored in the service information band allocation storage unit a223 based on the service to be used.
In other words, when using a service with a wide frequency bandwidth, the cellular phone device a2 can sufficiently secure other data bands even if the band of the random access signal is increased. Smooth communication is possible without any influence.

(Third embodiment)
The third embodiment of the present invention will be described below with reference to the drawings.
In the first embodiment, the wireless communication system determines the RACH slot pattern based on the maximum data transfer efficiency of the mobile phone device a1. In the wireless communication system according to the present embodiment, the mobile phone device determines the RACH slot pattern based on the error rate (communication quality information) in communication with the base station device. The conceptual diagram of the communication system according to the present embodiment is the same as FIG. 1 of the first embodiment.

FIG. 11 is a schematic block diagram showing a configuration of a wireless communication system according to the third embodiment of the present invention. As illustrated, the wireless communication system includes a mobile phone device a3 that is the mobile phone device A1 in FIG. 1 and a base station device b1 that is the base station device B1 in FIG.
When the wireless communication system according to the present embodiment (FIG. 11) and the wireless communication system according to the first embodiment (FIG. 4) are compared, the function of the base station device b1 is the same as that of the first embodiment, so that Is omitted.

  The cellular phone device a3 will be described. When the cellular phone device a3 (FIG. 11) according to the present embodiment is compared with the cellular phone device a1 (FIG. 4) according to the first embodiment, the storage unit a32 and the control unit a33 are different. However, the functions of other components (antenna unit a10, reception unit a11, and transmission unit a14) are the same as those in the first embodiment, and thus the description of the same functions as those in the first embodiment is omitted.

The storage unit a32 includes a RACH slot pattern candidate storage unit a121, a band allocation information storage unit a122, and a communication status band allocation storage unit a323. Since the functions of the RACH slot pattern candidate storage unit a121 and the bandwidth allocation information storage unit a122 are the same as those in the first embodiment, the description thereof is omitted.
The communication status band allocation storage unit a323 stores a communication status file in which an error rate in communication between the mobile phone device a3 and the base station device b1 is associated with a pattern number of the RACH slot pattern.

  FIG. 12 shows an example of a communication status file stored in the communication status band allocation storage unit a323. The communication status file shown in FIG. 12 includes items of error rate and pattern number. Here, the error rate is classified into five classes, and the error rate decreases as the class number increases. In this embodiment, the error rate is classified into five classes, but the present invention is not limited to this.

For example, the communication status file in FIG. 12 indicates that the pattern number “1” is associated with the communication status “class 2”.
In addition, the communication status file of FIG. 12 corresponds to pattern number “3” of the RACH slot pattern having a larger bandwidth than pattern number “1” for “class 4” having an error rate higher than “class 2”. It shows that it is attached.
As described above, in the communication status file, the pattern number of the RACH slot pattern having a large bandwidth is associated with a high error rate (low communication quality), that is, a larger class.

In FIG. 11, the control unit a33 includes a communication status detection unit a330, a RACH slot pattern determination unit a331, a RACH slot allocation unit a132, a random access signal generation unit a133, and a RACH slot pattern notification unit a134.
Since the functions of the RACH slot allocation unit a132, the random access signal generation unit a133, and the RACH slot pattern notification unit a134 are the same as those in the first embodiment, the description thereof is omitted.

The communication status detection unit a332 detects an error rate of communication between the base station device b1 and the mobile phone device a3.
Specifically, the communication status detection unit a332 counts the number of signal transmissions and the number of retransmissions in the communication procedure, and detects a value obtained by dividing the number of retransmissions by the number of transmissions as an error rate for a unit time.
The communication status detection unit a332 outputs the detected error rate to the RACH slot pattern determination unit a331.

The RACH slot pattern determination unit a331 selects a class for the error rate input from the communication status detection unit a332.
The RACH slot pattern determining unit a331 determines the pattern number corresponding to the selected error rate class as the pattern number of the RACH slot pattern in the communication status file stored in the communication status band allocation storage unit a323.

For example, when the error rate “class 2” is selected, the RACH slot pattern determination unit a331 determines the RACH slot pattern as the RACH slot pattern of the pattern number “1” corresponding to “class 2” in FIG.
Further, when the error rate “class 4” is selected, the RACH slot pattern determination unit a331 determines the RACH slot pattern with the pattern number “3”.

FIG. 13 is a flowchart showing an example of the operation of the wireless communication system according to the present embodiment.
First, the cellular phone device a3 detects an error rate (S301).
Next, the cellular phone device a3 refers to the communication status file (FIG. 12) and determines the RACH slot pattern number corresponding to the error rate class detected in S301. (S302).

Next, the cellular phone device a3 stores the pattern number of the RACH slot pattern determined in S302 in the band allocation information storage unit a122 (S303).
Next, the cellular phone device a3 notifies the base station device b1 of the pattern number of the RACH slot pattern determined in S302 (S304).

The cellular phone device a3 allocates a random access signal to the RACH slot band of the RACH slot pattern having the pattern number determined in S303 (S305).
Thereafter, the mobile phone device a3 transmits a random access signal using the slot assigned in S305, and the base station device b1 uses the slot of the RACH slot pattern of the pattern number notified in S304 to The random access signal from a3 is received (S306).

In the present embodiment, the pattern number of the RACH slot pattern is determined based on the error rate. However, the present invention is not limited to this, and the quality of communication between the mobile phone device a3 and the base station device b1 includes the reception level, information on power loss between the base station device a3 and the mobile phone device, and the random access signal. The pattern number of the RACH slot pattern may be determined based on the communication success rate / failure rate.
For example, when the reception level is high, the communication quality is high, and the mobile phone device a3 selects the pattern number of the RACH slot pattern having a large band. For example, when the power loss between the base station device a3 and the mobile phone device is low, the communication quality is high, and the mobile phone device a3 selects the pattern number of the RACH slot pattern having a large band. For example, when the communication success rate of the random access signal is high (the failure rate of the random access signal is low), the communication quality is high, and the mobile phone device a3 selects the pattern number of the RACH slot pattern with a large band.

As described above, according to the present embodiment, in the wireless communication system, the mobile phone device a3 determines the RACH slot pattern from the plurality of RACH slot patterns, and notifies the base station device b1 of the determined RACH slot pattern. To do. Further, in the wireless communication system, since the base station device b1 receives a random access signal from the mobile phone device a3 using the RACH slot pattern notified from the mobile phone device a3, each mobile phone device a3 has a different determination. The RACH slot pattern can be determined under conditions, and even if the communication status of each mobile phone device a3 is different, a random access signal can be assigned to an appropriate band, and the success rate of connection by random access, or Communication efficiency of signals other than the random access signal can be improved.
For example, the mobile phone device a3 allocates more RACH slots to increase the success rate of random access signals in an environment where communication quality is low, and reduces the RACH slot bandwidth allocated to random access signals in an environment where communication quality is high. Thus, the bandwidth that can be allocated to other communications can be increased, and high connection quality can be ensured and high throughput can be obtained.

(Fourth embodiment)
The fourth embodiment of the present invention will be described below with reference to the drawings.
In the first embodiment, the wireless communication system determines the RACH slot pattern based on the maximum data transfer efficiency of the mobile phone device a1. In the wireless communication system according to the present embodiment, the mobile phone device determines the RACH slot pattern based on the battery voltage status of its own device. The conceptual diagram of the communication system according to the present embodiment is the same as FIG. 1 of the first embodiment.

FIG. 14 is a schematic block diagram showing a configuration of a wireless communication system according to the fourth embodiment of the present invention. As illustrated, the wireless communication system includes a mobile phone device a4 that is the mobile phone device A1 in FIG. 1 and a base station device b1 that is the base station device B1 in FIG.
When the wireless communication system according to the present embodiment (FIG. 14) and the wireless communication system according to the first embodiment (FIG. 4) are compared, the function of the base station device b1 is the same as that of the first embodiment, and thus the description will be made. Is omitted.

  The cellular phone device a4 will be described. When the cellular phone device a4 (FIG. 14) according to the present embodiment is compared with the cellular phone device a1 (FIG. 4) according to the first embodiment, the storage unit a42 and the control unit a43 are different. However, the functions of other components (antenna unit a10, reception unit a11, and transmission unit a14) are the same as those in the first embodiment, and thus the description of the same functions as those in the first embodiment is omitted.

The storage unit a42 includes a RACH slot pattern candidate storage unit a121, a band allocation information storage unit a122, and a battery voltage band allocation storage unit a423. Since the functions of the RACH slot pattern candidate storage unit a121 and the bandwidth allocation information storage unit a122 are the same as those in the first embodiment, the description thereof is omitted.
The battery voltage band allocation storage unit a423 stores a power supply voltage file in which the power supply voltage of the mobile phone device a4 is associated with the pattern number of the RACH slot pattern.

FIG. 15 shows an example of a power supply voltage file stored in the communication status band allocation storage unit a323.
The power supply voltage file shown in FIG. 15 includes items of a power supply voltage and a pattern number. Here, the power supply voltage is classified into a class that is a range of three levels of power supply voltage, and the higher the class number, the higher the power supply voltage. In the present embodiment, the power supply voltage is classified into a range of three levels of power supply voltage, but the present invention is not limited to this.

  For example, in the communication status file of FIG. 15, the pattern number “1” is associated with the class “medium” of the power supply voltage indicating that the power supply voltage is in the range of 3.7 V (volts) to 4.0 V. It shows that.

In FIG. 14, the control unit a43 includes a battery voltage detection unit a430, a RACH slot pattern determination unit a431, a RACH slot allocation unit a132, a random access signal generation unit a133, and a RACH slot pattern notification unit a134.
Since the functions of the RACH slot allocation unit a132, the random access signal generation unit a133, and the RACH slot pattern notification unit a134 are the same as those in the first embodiment, the description thereof is omitted.

  The battery voltage detector a432 has a function of detecting the battery voltage of the mobile phone device a4. The battery voltage detection unit a432 outputs the detected battery voltage to the RACH slot pattern determination unit a431.

The RACH slot pattern determination unit a431 selects a class for the battery voltage input from the battery voltage detection unit a432.
The RACH slot pattern determination unit a431 determines the pattern number corresponding to the class of the selected battery voltage as the pattern number of the RACH slot pattern in the power supply voltage file stored in the battery voltage band allocation storage unit a423.

  For example, when the battery voltage detection unit a432 detects the power supply voltage “3.9” V, the RACH slot pattern determination unit a431 selects the power supply voltage class “medium”. The RACH slot pattern determination unit a431 determines the RACH slot pattern as the RACH slot pattern having the pattern number “1” corresponding to the power supply voltage class “medium” in FIG.

FIG. 16 is a flowchart showing an example of the operation of the wireless communication system according to the present embodiment.
First, the cellular phone device a4 detects a battery voltage (S401).
Next, the cellular phone device a4 determines the RACH slot pattern number corresponding to the class of the power supply voltage detected in S401 (S402).

Next, the cellular phone device a4 stores the pattern number of the RACH slot pattern determined in S402 in the band allocation information storage unit a122 (S403).
Next, the cellular phone device a4 refers to the power supply voltage file (FIG. 15), and notifies the base station device b1 of the pattern number of the RACH slot pattern determined in S402 (S404).

The cellular phone device a4 allocates a random access signal to the RACH slot band of the RACH slot pattern having the pattern number determined in S403 (S405).
Thereafter, the mobile phone device a4 transmits a random access signal using the slot assigned in S405, and the base station device b1 uses the slot of the RACH slot pattern of the pattern number notified in S404 to use the mobile phone device. A random access signal from a4 is received (S406).

  As described above, according to the present embodiment, in the wireless communication system, the mobile phone device a4 determines the RACH slot pattern from the plurality of RACH slot patterns, and notifies the base station device b1 of the determined RACH slot pattern. To do. In the wireless communication system, since the base station device b1 receives the random access signal from the mobile phone device a4 using the RACH slot pattern notified from the mobile phone device a4, each mobile phone device a4 has a different determination. The RACH slot pattern can be determined under conditions, and even if the communication status of each mobile phone device a4 is different, a random access signal can be assigned to an appropriate band, the success rate of connection by random access, or Communication efficiency of signals other than the random access signal can be improved.

Further, in the wireless communication system, when the battery voltage of the mobile phone device a4 decreases, the mobile communication device a4 reduces the random access signal allocation band to reduce the random access signal transmission, thereby reducing the random access signal transmission. The power consumption can be reduced, and the usage time can be extended when the remaining battery level of the mobile phone device a4 is reduced.
In the wireless communication system, when the mobile phone device a4 has a high battery voltage, the random access signal is increased by increasing the allocated bandwidth of the random access signal and increasing the transmission of the random access signal until the random access processing is successful. Can be shortened.

(Fifth embodiment)
The fifth embodiment of the present invention will be described below with reference to the drawings.
In the first to fourth embodiments, the wireless communication system is configured such that the mobile phone devices a1 to a4 are randomly accessed according to the pattern numbers of the RACH slot patterns determined by the RACH slot pattern determination units a131 to a431, respectively. The signal was allocated to the RACH slot and transmitted to the base station apparatus b1.
In the radio communication system according to the present embodiment, the pattern number of the RACH slot pattern determined by the mobile phone device is transmitted to the base station device. When the base station apparatus corrects the pattern number of the RACH slot pattern received from the mobile phone apparatus, the base station apparatus transmits the corrected pattern number of the RACH slot pattern. Also, the mobile phone device allocates a random access signal to the RACH slot according to the pattern number of the RACH slot pattern received from the base station device, and transmits it to the base station device.
The conceptual diagram of the communication system is the same as FIG. 1 of the first embodiment.

  FIG. 17 is a schematic block diagram showing a configuration of a wireless communication system according to the fifth embodiment of the present invention. As shown in the figure, the wireless communication system includes a mobile phone device a5 that is the mobile phone device A1 in FIG. 1 and a base station device b5 that is the base station device B1 in FIG.

First, the cellular phone device a5 will be described.
When the cellular phone device a5 (FIG. 17) according to the present embodiment is compared with the cellular phone device a3 (FIG. 11) according to the first embodiment, the storage unit a52 and the control unit a53 are different. However, the functions of other components (antenna unit a10, reception unit a11, and transmission unit a14) are the same as those in the third embodiment, and thus the description of the same functions as those in the third embodiment is omitted.

The storage unit a52 includes a RACH slot pattern candidate storage unit a121, a band allocation information storage unit a522, and a communication status band allocation storage unit a323. Since the functions of the RACH slot pattern candidate storage unit a121 and the communication status band allocation storage unit a323 are the same as those in the third embodiment, description thereof will be omitted.
The band allocation information storage unit a522 stores a pattern number of a corrected RACH slot pattern, which will be described later, received from the base station apparatus b5 via the receiving unit a11. The band allocation information storage unit a522 stores the pattern number of a corrected RACH slot pattern using the stored data. The slot allocation unit a532 allocates the bandwidth of the RACH slot.

The control unit a53 includes a communication status detection unit a330, a RACH slot pattern determination unit a331, a RACH slot allocation unit a532, a random access signal generation unit a133, and a RACH slot pattern notification unit a134.
The RACH slot allocation unit a532 allocates a random access signal to the RACH slot according to the pattern number of the corrected RACH slot pattern stored in the band allocation information storage unit a522, which is received from the base station apparatus b5. .

Next, the base station apparatus b5 will be described.
When the base station apparatus b5 (FIG. 17) according to the present embodiment is compared with the base station apparatus b1 (FIG. 11) according to the third embodiment, the storage unit b52 and the control unit b53 are different. However, the functions of the other components (antenna unit b10, reception unit b11, and transmission unit b14) are the same as those in the third embodiment, and thus the description of the same functions as those in the third embodiment is omitted.

The storage unit b52 includes a RACH slot pattern candidate storage unit b121, a band allocation information storage unit b522, and a mobile station information storage unit b521. Since the function of the RACH slot pattern candidate storage unit b121 is the same as that of the third embodiment, the description thereof is omitted.
The mobile station information storage unit b521 stores the pattern number of the RACH slot pattern transmitted from the plurality of mobile phone devices a5.
The bandwidth allocation information storage unit b522 stores the bandwidth allocation pattern information (RACH slot pattern pattern number) of the random access signal corrected by the RACH slot pattern correction unit b531 described later.

The control unit b53 includes a RACH slot pattern correction unit b531 (correction band allocation pattern determination unit) and a correction RACH slot pattern notification unit b532.
For each pattern number of the RACH slot pattern, the RACH slot pattern correction unit b531 stores in advance a pattern allocation maximum number that is the maximum number of mobile phone devices a5 to which the band of the pattern number is allocated. The RACH slot pattern correction unit b531 reads the pattern numbers of the RACH slot patterns transmitted from the plurality of mobile phone devices a5 stored in the mobile station information storage unit b521 in the order of arrival, and calculates the number of mobile phone devices a5 for each pattern number. calculate.

If the calculated number of mobile phone devices a5 is smaller than the maximum number of pattern assignments stored in advance, the RACH slot pattern correction unit b531 does not correct the notified pattern number of the RACH slot pattern, and the band assignment information storage unit b522 Remember me.
On the other hand, when the calculated number of mobile phone devices a5 exceeds the maximum number of pattern assignments stored in advance, the RACH slot pattern correction unit b531 determines the RACH slot pattern correction unit b531 for the mobile phone device a5 that has received the RACH slot pattern pattern number thereafter. The pattern number of the slot pattern is corrected to another pattern number. The RACH slot pattern correction unit b531 stores the corrected RACH slot pattern (corrected band allocation pattern) pattern number (referred to as the corrected RACH slot pattern pattern number) in the band allocation information storage unit b522.
The correction method performed by the RACH slot pattern correction unit b531 is not limited to this, and other methods may be used.

  The corrected RACH slot pattern notifying unit b532 notifies the mobile phone device a5 of the pattern number of the corrected RACH slot pattern stored in the band allocation information storage unit b522.

FIG. 18 is a flowchart showing an example of the operation of the wireless communication system according to the present embodiment.
First, the cellular phone device a5 detects an error rate (S501).
Next, the cellular phone device a5 determines the RACH slot pattern number corresponding to the error rate class detected in S501 (S502).

Next, the cellular phone device a5 notifies the base station device b5 of the pattern number of the RACH slot pattern determined in S502 (S503).
If the base station apparatus b5 matches a predetermined condition, the base station apparatus b5 corrects the pattern number of the RACH slot pattern to the pattern number of the corrected RACH slot pattern (S504).
The base station device b5 notifies the mobile phone device a5 of the pattern number of the corrected RACH slot pattern (S505).

Next, the cellular phone device a5 stores the pattern number of the RACH slot pattern notified in S504 in the band allocation information storage unit a522 (S506).
The cellular phone device a5 allocates a random access signal to the RACH slot band of the RACH slot pattern having the pattern number notified in S504 (S507).
Thereafter, the mobile phone device a5 transmits a random access signal using the slot assigned in S507, and the base station device b5 uses the slot of the RACH slot pattern with the pattern number corrected in S504 to use the mobile phone device. The random access signal from a5 is received (S508).

As described above, according to the present embodiment, in the radio communication system, the mobile phone device a5 determines the RACH slot pattern from the plurality of RACH slot patterns, and the determined RACH slot pattern is transmitted to the base station device b5. Notice. In the wireless communication system, the base station device b5 corrects the RACH slot pattern notified from the mobile phone device a5, and notifies the mobile station device a5 of the corrected RACH slot pattern. Further, the mobile station device a5 allocates and transmits a random access signal to the slot of the corrected RACH slot pattern notified from the base station device b5, and the base station device b5 uses the slot of the corrected RACH slot pattern. Receive a random access signal.
Therefore, each of the mobile phone devices a5 can determine the RACH slot pattern under different determination conditions, and even if the communication status of each of the mobile phone devices a5 is different, a random access signal can be assigned to an appropriate band. The success rate of connection by random access, or the communication efficiency of signals other than random access signals can be improved.

  In the wireless communication system, since the base station device b5 corrects the RACH slot pattern notified from the mobile phone device a5, the base station device b5 can control the band allocated to the random access signal.

Note that some of the mobile station devices a1 to a5 or the base station devices b1 and b5 in the above-described embodiment, for example, the data transfer efficiency detection unit a130, the service type detection unit a230, the frequency band detection unit a2301, and the communication status detection unit. a330, power supply voltage detection unit a430, RACH slot determination unit a131, a231, a331, a431, RACH slot allocation unit a132, a532, random access signal generation unit a133, RACH slot pattern notification unit a134, control unit b13, b53, RACH slot The correction unit b531 and the correction RACH slot pattern notification unit b532 may be realized by a computer.
In that case, a program for realizing this control function is recorded in a computer-readable recording medium, and the program recorded in this recording medium is read into a computer system built in a base station device or a mobile phone device, It may be realized by executing. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In this case, it is also possible to include one that holds a program for a certain time, such as a volatile memory inside a computer system that becomes a server or client. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

It is a conceptual diagram of the communication system of this invention. It is the schematic which shows an example of the RACH slot pattern table | surface which concerns on this embodiment. It is explanatory drawing for demonstrating the RACH slot pattern table which concerns on this embodiment. 1 is a schematic block diagram illustrating a configuration of a wireless communication system according to a first embodiment. It is a flowchart which shows an example of operation | movement of the radio | wireless communications system which concerns on 1st Embodiment. It is a schematic block diagram which shows the structure of the radio | wireless communications system which concerns on 2nd Embodiment. It is the schematic which shows an example of the RACH slot pattern table | surface which concerns on 2nd Embodiment. It is a flowchart which shows an example of operation | movement of the radio | wireless communications system which concerns on 2nd Embodiment. It is a schematic block diagram which shows the structure of the radio | wireless communications system which concerns on 2nd Embodiment. It is the schematic which shows an example of the RACH slot pattern table | surface which concerns on 2nd Embodiment. It is a schematic block diagram which shows the structure of the radio | wireless communications system which concerns on 3rd Embodiment. It is the schematic which shows an example of the RACH slot pattern table | surface which concerns on 3rd Embodiment. It is a flowchart which shows an example of operation | movement of the radio | wireless communications system which concerns on 3rd Embodiment. It is a schematic block diagram which shows the structure of the radio | wireless communications system which concerns on 4th Embodiment. It is the schematic which shows an example of the RACH slot pattern table | surface which concerns on 4th Embodiment. It is a flowchart which shows an example of operation | movement of the radio | wireless communications system which concerns on 4th Embodiment. It is a schematic block diagram which shows the structure of the radio | wireless communications system which concerns on 5th Embodiment. It is a flowchart which shows an example of operation | movement of the radio | wireless communications system which concerns on 5th Embodiment.

Explanation of symbols

A1 to 3, a1 to a5... Mobile phone devices, B1, 2, b1, b5... Base station device a10... Antenna unit, a11... Receiving unit, a12, a22, a32, a42, a52 ... storage unit, a13, a23, a33, a43, a53 ... control unit, a14 ... transmission unit, a121 ... RACH slot pattern candidate storage unit, a122 ... band allocation information storage unit, a223 ... Service information band allocation storage unit, a2231 ... Frequency band allocation storage unit, a323 ... Communication status band allocation storage unit, a423 ... Power supply voltage band allocation storage unit, a130 ... Data transfer efficiency detection Unit, a230 ... service type detection unit, a2301 ... frequency band detection unit, a330 ... communication status detection unit, a430 ... power supply voltage detection unit, a131, a231 a331, a431 ... RACH slot pattern determination unit, a132, a532 ... RACH slot allocation unit (band allocation unit), a133 ... random access signal generation unit, a134 ... RACH slot pattern notification unit b10. Antenna unit, b11 ... receiving unit, b12 ... storage unit, b121 ... RACH slot pattern candidate storage unit, b122, b522 ... band allocation information storage unit, b522 ... mobile station information storage unit , B13, b53 ... control unit, b531 ... RACH slot correction unit, b532 ... correction RACH slot pattern notification unit, b14 ... transmission unit

Claims (12)

In a wireless communication system comprising: a first communication device that allocates and transmits a random access signal in a predetermined band; and a second communication device that receives a random access signal transmitted from the communication device.
The first communication device is:
A bandwidth allocation pattern that is a combination of the bandwidths, and a bandwidth allocation pattern determination unit that determines a bandwidth allocation pattern from a plurality of the bandwidth allocation patterns that are different in size from each other;
A bandwidth allocation pattern notifying unit for notifying information of the bandwidth allocation pattern determined by the bandwidth allocation pattern determining unit;
A bandwidth allocation unit that allocates the random access signal in a bandwidth of the bandwidth allocation pattern determined by the bandwidth allocation pattern determination unit;
With
The second communication device is:
The information on the bandwidth allocation pattern notified from the bandwidth allocation pattern notification unit of the first communication device is received, and the random access signal from the first communication device is received using the bandwidth of the bandwidth allocation pattern. A wireless communication system comprising a receiving unit. A wireless communication system comprising: a plurality of first communication devices that allocate and transmit a random access signal within a predetermined band; and a second communication device that receives a random access signal transmitted from the communication device. ,
The first communication device is:
A bandwidth allocation pattern that is a combination of the bandwidths, and a bandwidth allocation pattern determination unit that determines a bandwidth allocation pattern from a plurality of the bandwidth allocation patterns that are different in size from each other;
A bandwidth allocation pattern notifying unit for notifying information of the bandwidth allocation pattern determined by the bandwidth allocation pattern determining unit;
Receiving the information of the corrected band allocation pattern notified from the corrected band allocation pattern notifying unit of the second communication device, and allocating the random access signal in the band of the corrected band allocation pattern;
With
The second communication device is:
Correction for determining a correction band allocation pattern, which is a band allocation pattern used by each of the plurality of first communication apparatuses, based on the band allocation pattern information notified from the band allocation pattern notification unit of the plurality of first communication apparatuses. A bandwidth allocation pattern determination unit;
A correction band allocation pattern notification unit for notifying information of the correction band allocation pattern determined by the correction band allocation pattern determination unit;
A wireless communication system comprising: The wireless communication according to claim 1 or 2, wherein the bandwidth allocation pattern determination unit determines the bandwidth allocation pattern based on information indicating a transmission speed of information that can be transmitted by the first communication device. system. The first communication device communicates with the second communication device for a plurality of types of communication services that are communication services other than the random access signal and have different communication speeds.
The wireless communication system according to claim 1 or 2, wherein the bandwidth allocation pattern determination unit determines the bandwidth allocation pattern based on information indicating a type of the communication service scheduled for communication. The first communication device performs communication using a communication band that is a predetermined band for the second communication device,
The radio communication system according to claim 1 or 2, wherein the band allocation pattern determination unit determines the band allocation pattern based on information indicating a size of the communication band. The band allocation pattern determination unit determines the band allocation pattern based on communication quality information between the first communication device and the second communication device. Wireless communication system. The first communication device transmits control information used for communication control and user information other than the control information to the second communication device,
The wireless communication system according to claim 1 or 2, wherein the bandwidth allocation pattern determination unit determines the bandwidth allocation pattern based on information indicating an information amount of the user information. The radio communication system according to claim 1 or 2, wherein the band allocation pattern determination unit determines the band allocation pattern based on information indicating a communication success rate of the random access signal. The wireless communication system according to claim 1 or 2, wherein the bandwidth allocation pattern determination unit determines the bandwidth allocation pattern based on battery voltage information of the first communication device. In a communication device that allocates and transmits a random access signal within a predetermined band,
A bandwidth allocation pattern that is a combination of the bandwidths, and a bandwidth allocation pattern determination unit that determines a plurality of the bandwidth allocation patterns whose sizes of the combined bandwidths are different from each other;
A bandwidth allocation pattern notifying unit for notifying information of the bandwidth allocation pattern determined by the bandwidth allocation pattern determining unit;
A communication apparatus comprising: In a wireless transmission method in a communication device for allocating and transmitting a random access signal within a predetermined band,
A first process in which the communication apparatus determines a plurality of band allocation patterns, which are band allocation patterns that are combinations of the bands, the sizes of the combined bands being different from each other;
A second process in which the communication device notifies information of a bandwidth allocation pattern determined in the first process;
A wireless transmission method comprising: To a computer of a communication device that allocates and transmits a random access signal within a predetermined band,
Band allocation pattern determination means for determining a plurality of band allocation patterns, which are band allocation patterns that are combinations of the bands, the sizes of the combined bands being different from each other;
Bandwidth allocation pattern notification means for notifying information of the bandwidth allocation pattern determined by the bandwidth allocation pattern determination means;
Wireless transmission program to function as.

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