JP2016072688A - Base station device, radio terminal, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a radio terminal in an idle state to distribute in-zone frequencies in a high-speed and real-time manner.SOLUTION: A base station device in a radio communication system including one or more radio terminals and the base station device transmits, to the one or more radio terminals, information to form a table that is used when determining which frequency band of a plurality of frequency bands each of one or more radio terminals that have not established connection is staying in, and that determines the priority of each of the plurality of frequency bands.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a determination process of a serving frequency of a terminal device.

  In a wireless communication system in which a wireless terminal communicates with a base station apparatus using any of a plurality of frequency bands, the number (load) of wireless terminals connected to the base station apparatus is not biased in the plurality of frequency bands. This is very important. In recent years, in addition to this, it has been recognized that it is important to disperse the existing frequency bands even for wireless terminals that have not established a connection (see Non-Patent Document 1).

3GPP contribution, R2-141314, “Idle mode load balancing improvements”, March 2014

  In 3GPP Long Term Evolution (LTE), when distributing the frequency bands in which idle wireless terminals that have not established a connection are distributed, the priority of each frequency band is assigned to each radio in the system information block (SIB). The terminal can be notified. However, with this method, priority information is uniformly notified to each wireless terminal, and as a result, idle wireless terminals may be located in some frequency bands unnecessarily. . Therefore, there is a problem that it takes time until the load in each frequency band is dispersed and converged.

  In LTE, when a wireless terminal connected to a base station apparatus shifts to an idle state, the base station apparatus can notify the wireless terminal of individual priority information. . However, in this case, since the priority can be notified only to the wireless terminal at the timing of transition from the connected state to the idle state, there is a problem that it is not easy to cope with real-time load fluctuations.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a technology that enables high-speed and real-time frequency dispersion of a serving frequency of a wireless terminal in an idle state.

  In order to achieve the above object, a base station apparatus according to the present invention is the base station apparatus in a radio communication system including a radio terminal and a base station apparatus, and each of one or more radio terminals that have not established a connection. Is a table used to determine which frequency band of a plurality of frequency bands is located, and information for forming the table that specifies the priority for each of the plurality of frequency bands And transmitting means for transmitting to the one or more wireless terminals.

  In order to achieve the above object, a wireless terminal according to the present invention is a wireless terminal in a wireless communication system including a wireless terminal and a base station device, and a plurality of frequency bands when a connection is not established. A table used to determine which frequency band of which the frequency band is in, and receives information from the base station apparatus for forming the table that specifies the priority for each of the plurality of frequency bands Receiving means; forming means for forming the table based on the received information; and determining means for determining a frequency band in the area based on the formed table.

  According to the present invention, high-speed and real-time frequency distribution of a serving frequency of a wireless terminal in an idle state is possible.

The figure which shows the conceptual diagram of a radio | wireless communications system. Schematic of the table used when determining the frequency band in which the wireless terminal is located. The block diagram which shows the hardware structural example of a base station apparatus and a radio | wireless terminal. The block diagram which shows the function structural example of a base station apparatus. The block diagram which shows the function structural example of a radio | wireless terminal. Schematic which shows the example of the information transmitted to a radio | wireless terminal from a base station apparatus. Schematic which shows another example of the information transmitted to a radio | wireless terminal from a base station apparatus. The figure which shows the flow of a process in a radio | wireless communications system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(System configuration)
FIG. 1 shows a conceptual diagram of a wireless communication system according to the present embodiment. In this wireless communication system, as an example, a connection is established between the base station apparatus 101 and a plurality of wireless terminals 102 existing within the range of the cell 111 or the cell 121 deployed by the base station apparatus 101 to perform communication. Is called. Note that the cell 111 and the cell 121 have different frequencies to be used, such as 800 MHz and 2 GHz.

  In addition, FIG. 1 shows a case where the base station apparatus 101 has deployed two cells (cell 111 and cell 121), but the base station apparatus 101 has more than two frequency bands. A plurality of cells may be expanded. Also, the base station apparatus 101 and other base station apparatuses may deploy cells of different frequency bands. Further, in FIG. 1, only two wireless terminals 102 are shown, but there may be more than two wireless terminals.

  In the following description, it is assumed that the wireless terminal 102 has not established a connection with the base station apparatus 101, and a plurality of idle wireless terminals 102 are distributed in each of a plurality of frequency bands. Perform such control. Specifically, the base station apparatus 101 forms a table used when determining which frequency band the wireless terminal 102 is in for one or more idle wireless terminals 102. Send information. The formed table defines priorities for each of a plurality of frequency bands, and the wireless terminal 102 forms this table based on the received information, and the frequency bands that are located in accordance with this table. To decide.

  FIG. 2 shows an example of a table formed by the wireless terminal 102 and used for determining the frequency band in which the wireless terminal 102 is located. FIG. 2 shows an example of a table in which eight levels (0 to 7) of priorities are assigned to four frequency bands (A to D). In addition, the numerical value of a priority has shown that the degree which should prevail in the frequency band preferentially, so that it is large. That is, in the example of FIG. 2, the frequency band C has the highest priority, and the frequency band D has the next highest priority.

  For example, when the wireless terminal 102 is located in the frequency band A, the wireless terminal 102 measures the quality of the wireless signal for the frequency bands C and D having a higher priority than the priority 0 of the frequency band A in the area. Then, the wireless terminal 102 performs inter-band cell reselection so that the quality of the measurement result in the frequency bands C and D is within the frequency band satisfying the predetermined quality. Here, for example, it is assumed that the quality of the wireless terminal 102 does not satisfy the predetermined quality in the frequency band C, the quality satisfies the predetermined quality in the frequency band D, and has shifted to the frequency band D due to interband cell reselection. To do. Then, the wireless terminal 102 receives information for forming a table to which the priority of each frequency band is attached in the cell of the frequency band D that exists after the transition by cell reselection. At this time, when the received information indicates that the priority of the frequency band C is higher than the frequency band D in which the frequency band C is located, the wireless terminal 102 again performs the frequency band C having a higher priority than the frequency band D in the area. Measure the quality of the radio signal. As a result, when the quality satisfies the predetermined quality in the frequency band C, the radio terminal 102 shifts to the frequency band C by reselecting the interband cell. Note that these are examples of operations, and the wireless terminal 102 may move the frequency band in which it is located in a format other than this.

  In this wireless communication system, the base station apparatus 101 transmits information for forming such a table to the wireless terminal 102. This information is information such as a selection probability for setting priority for each of a plurality of frequency bands. This information will be described later. Below, the structural example of the base station apparatus 101 and the radio | wireless terminal 102 is demonstrated first, and operation | movement of these apparatuses is demonstrated after that.

(Configuration of base station apparatus and wireless terminal)
FIG. 3 shows a hardware configuration example of the base station apparatus 101 and the wireless terminal 102. As illustrated in FIG. 3, the base station device 101 and the wireless terminal 102 include, for example, a CPU 301, a ROM 302, a RAM 303, an external storage device 304, and a communication device 305. In the base station apparatus 101 and the wireless terminal 102, for example, the CPU 301 executes a program that realizes each function of each apparatus shown below, which is recorded in one of the ROM 302, the RAM 303, and the external storage device 304, for example. Done. Then, the base station apparatus 101 and the wireless terminal 102 transmit or receive signals using the communication apparatus 305. In FIG. 3, the base station apparatus 101 and the wireless terminal 102 have one communication apparatus 305, but may have a plurality of communication apparatuses. For example, the base station apparatus 101 and the wireless terminal 102 can have a plurality of communication apparatuses corresponding to a plurality of frequency bands.

  Note that the base station apparatus 101 and the wireless terminal 102 may include dedicated hardware that executes each function described below, or a computer that executes part of the hardware and operates the program. May be executed. Further, all the following functions may be executed by a computer and a program.

  FIG. 4 shows a functional configuration example of the base station apparatus 101. The base station apparatus 101 includes, for example, an information generation unit 401 and a transmission unit 402 as its functions. In addition to these functional units, the base station apparatus 101 functions as a general base station apparatus (for example, a function for receiving signals, a communication function for connecting to a core network, and other control functions). It also has.

  The information generation unit 401 is used, for example, when determining in which frequency band of the plurality of frequency bands each of the one or more wireless terminals 102 that have not established a connection is, for example, FIG. Information for forming a table as shown in FIG. Note that this information includes, for example, information on the selection probability when each of the one or more wireless terminals 102 selects which of the plurality of frequency bands is given higher priority. Examples of information generated by the information generation unit 401 are shown in FIGS. 6 (a) to 6 (c) and FIG. Here, the selection probability has a higher value in a frequency band having a higher degree to which a high priority should be given.

  For example, the information generated by the information generation unit 401 can be the selection probability itself as shown in FIG. Further, the information generated by the information generation unit 401 may be a selection ratio having a larger value in a frequency band having a higher degree of selection as shown in FIG. Further, the information generated by the information generation unit 401 may be the load in each frequency band as shown in FIG. Further, as shown in FIG. 7, the information generated by the information generation unit 401 may be determined for each capability of the wireless terminal as shown in FIGS. 6 (a) to 6 (c). For example, if frequency band A supports 8 × 8 MIMO but other frequency bands do not support this, wireless terminal 102 supporting 8 × 8 MIMO has priority over frequency band A. You can make it a sphere. On the other hand, in this case, the wireless terminal 102 that does not support 8 × 8 MIMO can be located in a frequency band other than the frequency band A as much as possible.

  The transmission unit 402 transmits the information generated by the information generation unit 401 to one or more wireless terminals 102 that have not established a connection. Note that the transmission unit 402 broadcasts information generated by the information generation unit 401 to one or more wireless terminals 102 in an idle state using a system information block (SIB).

  FIG. 5 shows a functional configuration example of the wireless terminal 102. The wireless terminal 102 includes, for example, a receiving unit 501, a table forming unit 502, and a serving frequency determining unit 503. In some cases, the wireless terminal 102 further includes a timer 504. Note that the wireless terminal 102 also has a function as a normal wireless terminal such as a function of transmitting a signal.

  The receiving unit 501 receives information illustrated in FIGS. 6A to 6C and FIG. 7 transmitted from the base station apparatus 101. The received information is input to the table forming unit 502.

  The table forming unit 502 includes priority information used when determining a frequency band in the area based on the information shown in FIGS. 6A to 6C and FIG. 7 received from the base station apparatus 101. Form a table. This table is, for example, a table as shown in FIG. Here, an example of how the table forming unit 502 forms a table when information as shown in FIGS. 6A to 6C is acquired will be described.

When the table forming unit 502 acquires the selection probability information as shown in FIG. 6A, the table forming unit 502 selects one of the frequency bands A to D according to the selection probability, Is set to “7” (maximum value), for example. For other frequency bands, the priority is set to “0” (minimum value), for example. The frequency band is selected by generating a random number in the wireless terminal 102, for example. For example, the table forming unit 502 generates random numbers from 0 to 127. Then, the table forming unit 502 is, for example, if 6 of (a), the selection probability P _A to P _D of each frequency band is 1/4, respectively, if the random number value is generated is 0 to 31 frequency Select band A. Similarly, the table forming unit 502 uses the frequency band B when the generated random value is 32 to 63, the frequency band C when the generated random value is 64 to 95, and the generated random value is 96. In the case of ~ 127, the frequency band D is selected. When P _A = 7/8, P _B = 1/16, and P _C = P _D = 1/32, the table forming unit 502 selects the frequency band A when the random number value is 0 to 111. Then, for example, the priority is set to “7”. Similarly, when the random value is 112 to 119, the frequency band B is selected, when the random value is 120 to 123, the frequency band C is selected, and when the random value is 124 to 127, the frequency band D is selected, and the priority is selected. For example, the degree is set to “7”. In this example, the priority is set to “0” for a frequency band that has not been selected.

  Therefore, when this information is notified to a large number of idle wireless terminals 102, many wireless terminals 102 set a high priority in a frequency band with a high selection probability, and in a frequency band with a low selection probability. The number of wireless terminals 102 that set a high priority is small. As a result, for example, the idle wireless terminal 102 can be moved from a frequency band in an overload state to a relatively free frequency band. In addition, since the high priority frequency bands are distributed for each idle wireless terminal 102, it is possible to prevent all or most of the wireless terminals 102 from moving and to converge to a load-distributed state. Can be shortened.

Further, for example, when acquiring information on the selection ratio as shown in FIG. 6B, the table forming unit 502 calculates selection probabilities according to the selection ratios R _{A to} R _D. For example, the table forming unit 502 calculates the selection probability P _A of the frequency band A as P _A = R _A / (R _A + R _B + R _C + R _D ). Similarly, the selection probability P _B of the frequency band B is calculated as P _B = R _B / (R _A + R _B + R _C + R _D ). The same applies to frequency bands C and D. After determining the selection probability, the table forming unit 502 executes the same processing as when the information shown in FIG. 6A is acquired.

  As a result, when this information is notified to a large number of idle wireless terminals 102, many wireless terminals 102 set a high priority in a frequency band with a high selection ratio value, and the selection ratio value is In the low frequency band, the number of wireless terminals 102 that set high priority is small. As a result, for example, the idle wireless terminal 102 can be moved from a frequency band in an overload state to a relatively free frequency band. In addition, since the high priority frequency bands are distributed for each idle wireless terminal 102, it is possible to prevent all or most of the wireless terminals 102 from moving and to converge to a load-distributed state. Can be shortened.

Note that the value of the selection ratio may be set according to the range in which the table forming unit 502 generates random numbers. That is, when the table forming unit 502 generates a random number value from 0 to 127, the selection ratio may be set so that, for example, R _A + R _B + R _C + R _D = 128. Further, a random number range may be set as the selection ratio. For example, when the table forming unit 502 generates random values from 0 to 127, for example, R _{A to} R _D may be set to 0 to 31, 32 to 63, 64 to 95, and 96 to 127, respectively. In this case, each selection ratio corresponds to a selection probability of 1/4. In this case, the table forming unit 502 does not need to calculate the selection probability.

Further, for example, when the table forming unit 502 acquires the load index value information as illustrated in FIG. 6C, the table forming unit 502 is proportional to the reciprocal of the load magnitude according to the load index values L _{A to} L _D. Such a selection probability is calculated. For example, the table forming unit 502 calculates the selection probability P _A of the frequency band A as P _A = (1 / L _A ) / (1 / L _A + 1 / L _B + 1 / L _C + 1 / L _D ). To do. Similarly, the selection probability P _B of the frequency band B is calculated as P _B = (1 / L _B ) / (1 / L _A + 1 / L _B + 1 / L _C + 1 / L _D ). The same applies to frequency bands C and D. After determining the selection probability, the table forming unit 502 executes the same processing as when the information shown in FIG. 6A is acquired.

  As a result, when this information is notified to a large number of idle wireless terminals 102, many wireless terminals 102 set a high priority in a frequency band with a low load index value, and a frequency with a high load index value. The number of wireless terminals 102 that set a high priority to the band is small. As a result, for example, the idle wireless terminal 102 can be moved from a frequency band in an overload state to a relatively free frequency band. In addition, since the high priority frequency bands are distributed for each idle wireless terminal 102, it is possible to prevent all or most of the wireless terminals 102 from moving and to converge to a load-distributed state. Can be shortened.

  In the above description, the table forming unit 502 assigns a priority that is higher than the other, that is, a non-zero priority, to only one frequency band among the plurality of frequency bands. You may make it allocate. For example, the table forming unit 502 first selects one of the frequency bands A to D on the basis of the selection probability information as shown in FIG. 6A, and for the selected frequency band, The maximum priority value “7” is assigned. Here, when the selected frequency band is the frequency band C, the table forming unit 502 next assigns a priority value between 0 and 7 from the frequency bands A, B, and D. Select the band. Here, for example, if the frequency band D is selected, the table forming unit 502 assigns a priority value “5” to the frequency band D. As a result, a priority table as shown in FIG. 2 is formed as a result. This process may be continued until all frequency bands are selected.

  Moreover, the priority value to be assigned may be reduced at regular intervals according to the selected order, such as “7” “6” “5”. It may be reduced at non-uniform intervals, such as 2 ”,“ 1 ”, etc. Furthermore, the same value may be assigned to a plurality of frequency bands. Further, the priority assigned to the frequency band selected for the first time may not be the maximum value, and for example, “5” or the like may be assigned.

Furthermore, when a priority value is set by selecting a plurality of frequency bands, the frequency band selected for the first time may be excluded in the second selection. That is, for example, when selection probability P _A to P _D is 1/4 respectively, when the frequency band A is selected for the first time, the table forming unit 502 selects a probability as a target only the frequency band B~D The second selection may be executed with as 1/3. Further, the frequency band selected at the first time may not be excluded at the time of the second selection. In this case, for example, when selection probability P _A to P _D is 1/4 respectively, when the frequency band A is selected for the first time, the table forming section 502, as for all frequency bands A~D A second selection is executed with a selection probability of 1/4. Then, when the frequency band A is selected again, the table forming unit 502 may ignore the result and execute the selection again. Further, when the frequency band A is selected again, the table forming unit 502 may lower the priority value to be set for the frequency band selected next. For example, when assigning priorities “7”, “6”, “5”,... In the selected order, when frequency band A is selected for the first time and second time, and frequency B is selected for the third time, The priority “7” may be set for the frequency band A, and “5” may be set for the frequency band B instead of the priority “6”. The number of selections may be limited to a predetermined number.

In the above example, the table forming unit 502 generates a random number and selects a frequency band for setting the priority. For example, a telephone number assigned to the wireless terminal 102 including the table forming unit 502 is used. The frequency band may be selected according to information specific to the terminal. That is, for example, when the selection probabilities P _{A to} P _D are each 1/4, the wireless terminal 102 whose last two digits are 0 to 24 selects the frequency band A, and the last two digits of the phone number is 25. The wireless terminals 102 to 49 select the frequency band B. In this way, by performing selection using information unique to the wireless terminal 102, it is not necessary to generate a random number, so that the processing can be speeded up and the processing can be simplified.

When the table forming unit 502 acquires information as illustrated in FIG. 7, the table forming unit 502 can form a table according to the capability of the wireless terminal 102 including itself. The capability includes, for example, whether or not it corresponds to 8 × 8 MIMO, 256QAM, Dual Connectivity, and Carrier Aggregation. Whether or not it has these capabilities is represented by a specific index. That is, for example, when the index is “1”, it is specified that it corresponds to 8 × 8 MIMO but does not correspond to others. At this time, the table forming unit 502 acquires information as shown in FIG. 7, and if the capability index of the wireless terminal 102 including the table forming unit 502 is “1”, the table forming unit 502 follows the selection probabilities P _{A1 to} P _D1. Form a table. Similarly, in the wireless terminal 102 with the capability index “3”, the table forming unit 502 forms a table according to the selection probabilities P _{A3 to} P _D3 . As a result, the wireless terminal 102 can select a frequency band according to its capability. For example, a wireless terminal 102 capable of supporting 8 × 8 MIMO is present in a frequency band corresponding to 8 × 8 MIMO, and conversely, 8 × 8 MIMO is not supported in a frequency band not supporting 8 × 8 MIMO. The probability that the wireless terminal 102 is located can be increased.

  The located frequency determining unit 503 determines a frequency band to be located according to the table formed by the table forming unit 502. In other words, the serving frequency determination unit 503 determines a frequency band to be visited according to, for example, the priority value and the quality of the radio signal included in the table. The located-frequency determining unit 503 measures the quality of the radio signal, for example, for a frequency band having a higher priority than the currently located frequency band, and the quality of the measurement result satisfies a predetermined quality. In this case, it is determined that the user should be in a frequency band having a high priority. As a result of this determination, the wireless terminal 102 performs interband cell reselection when it becomes necessary to switch the frequency band in which it is located.

  The timer 504 is used to determine a period during which at least one of the table formed by the table forming unit 502 and the frequency band determined by the serving frequency determining unit 503 is maintained. That is, for example, when an expiration date is set in the table formed by the table forming unit 502, the wireless terminal 102 transmits, for example, information regarding priority setting by the SIB by the SIB within the expiration date. Does not update the table. When an expiration date is set for the frequency band determined by the serving frequency determination unit 503, the wireless terminal 102 may not move to another frequency band within the expiration date. Thereby, it becomes possible to prevent the above-mentioned process from being repeated unnecessarily, and the control is stabilized.

(Process flow)
A flow of processing executed between the base station apparatus 101 and the idle wireless terminal 102 will be described with reference to FIG. First, when the process is started, the base station apparatus 101 generates information to be notified to the idle wireless terminal 102 (S801). This information is information for forming a table for specifying a priority for each of a plurality of frequency bands, which is used when the wireless terminal 102 determines which frequency band of the plurality of frequency bands is located. For example, the information is as shown in FIGS. 6A to 6C or FIG. Thereafter, the base station apparatus 101 transmits the generated information to the wireless terminal 102 (S802). This transmission is performed by broadcasting using, for example, a system information block (SIB).

  When the wireless terminal 102 in the idle state receives information from the base station apparatus 101, the wireless terminal 102 forms a table for specifying the priority for each of the plurality of frequency bands using the information (S803). Then, the wireless terminal 102 determines a frequency band to be located based on the table (S804), and performs interband cell reselection as necessary (S805).

  As a result, a large number of idle wireless terminals 102 execute the same processing, so that the idle wireless terminals 102 can be moved from, for example, an overloaded frequency band to a relatively free frequency band. . In addition, for each idle wireless terminal 102, a high priority frequency band is distributed, so that all or most of the wireless terminals 102 are prevented from moving to the same frequency band, and the load is distributed. The time until convergence to the state can be shortened.

Claims (15)

The base station apparatus in a radio communication system including a radio terminal and a base station apparatus,
Each of the one or more wireless terminals that have not established a connection is a table used to determine in which frequency band of a plurality of frequency bands, and for each of the plurality of frequency bands Transmission means for transmitting information for forming the table for specifying priority to the one or more wireless terminals;
A base station apparatus. The information is information related to a selection probability when each of the one or more wireless terminals selects which of the plurality of frequency bands is given high priority.
The base station apparatus according to claim 1. The information includes, for each of the plurality of frequency bands, the selection probability having a larger value in a frequency band having a higher degree to which a high priority should be given.
The base station apparatus according to claim 2. The information includes, for each of the plurality of frequency bands, a selection ratio having a larger value as a frequency band having a higher degree to be selected;
In each of the one or more wireless terminals, a value proportional to the ratio is used as the selection probability.
The base station apparatus according to claim 2. The information includes a load magnitude value of the plurality of frequency bands,
In each of the one or more wireless terminals, a value proportional to the inverse of the load magnitude value is used as the selection probability.
The base station apparatus according to claim 2. For the plurality of capabilities each of the one or more wireless terminals can have, the transmission means transmits a plurality of the information according to each capability to the one or more wireless terminals,
Each of the one or more wireless terminals selects information to be used when forming the table for specifying the priority for each of the plurality of frequency bands from the plurality of received information according to its own ability. Used as
The base station apparatus according to claim 1, wherein the base station apparatus is a base station apparatus. The wireless terminal in a wireless communication system including a wireless terminal and a base station device,
A table used to determine in which frequency band of a plurality of frequency bands when connection is not established, the table specifying the priority for each of the plurality of frequency bands Receiving means for receiving information to form from the base station device;
Forming means for forming the table based on the received information;
Determining means for determining a frequency band in the area based on the formed table;
A wireless terminal characterized by comprising: The information is information related to a selection probability when the wireless terminal selects which of the plurality of frequency bands is given high priority.
The forming means forms the table defining priority for each of the plurality of frequency bands based on the selection probability;
The wireless terminal according to claim 7. The forming means generates a random number and determines a priority for each of the plurality of frequency bands based on the selection probability;
The wireless terminal according to claim 8. The reception means receives a plurality of pieces of information corresponding to each capability with respect to a plurality of capabilities each of the wireless terminal and other wireless terminals can have,
The forming means selects information to be used when forming the table for specifying the priority for each of the plurality of frequency bands from the received plurality of information according to the capability of the wireless terminal, and Forming the table defining priorities for each of the frequency bands,
The wireless terminal according to claim 7, wherein the wireless terminal is a wireless terminal. A timer for determining a period in which at least one of the formed table and the determined frequency band being maintained is maintained;
The wireless terminal according to claim 7, wherein the wireless terminal is a wireless terminal. A control method for the base station apparatus in a radio communication system including a radio terminal and a base station apparatus,
The transmission unit is a table used when each of one or more wireless terminals that have not established a connection determines in which frequency band of the plurality of frequency bands, the plurality of frequencies Transmitting information for forming the table identifying the priority for each of the bands to the one or more wireless terminals;
A control method characterized by that. A method for controlling the wireless terminal in a wireless communication system including a wireless terminal and a base station device,
A table used when the receiving means determines in which frequency band of a plurality of frequency bands the connection is not established, and specifies the priority for each of the plurality of frequency bands Receiving the information for forming the table from the base station device;
A forming step of forming the table based on the received information;
A determining step for determining a frequency band in the area based on the formed table;
A control method characterized by comprising: In a computer provided in the base station apparatus in a wireless communication system including a wireless terminal and a base station apparatus,
Each of the one or more wireless terminals that have not established a connection is a table used to determine in which frequency band of a plurality of frequency bands, and for each of the plurality of frequency bands The program for performing the transmission process which transmits the information for forming the table which specifies a priority with respect to the said 1 or more radio | wireless terminal. In a computer provided in the wireless terminal in a wireless communication system including a wireless terminal and a base station device,
A table used to determine in which frequency band of a plurality of frequency bands when connection is not established, the table specifying the priority for each of the plurality of frequency bands Receiving for receiving information for forming from the base station device;
Forming the table based on the received information;
A determination step of determining a frequency band in the area based on the formed table;
A program for running

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