JP5392341B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a radio communication technique using a terminal device in which both or one of the first frequency bandwidth and its center frequency used for uplink and the second frequency bandwidth and its center frequency used for downlink are variable. About.

In recent years, higher communication speeds have been required for wireless communication. For example, in mobile communication services such as mobile phones, high-speed broadband communication systems have been studied in response to demands for higher speeds. As one of the communication systems, a W-CDMA (Wideband-Code Division Multiple Access) system has been studied and standardized in 3GPP (3rd Generation Partnership Project).
Hereinafter, the W-CDMA system will be described as an example. In the W-CDMA system, a terminal device (UE: User Equipment) such as a mobile phone or a car phone, a base station (Node B) that communicates with a terminal device (hereinafter abbreviated as “terminal”), and a plurality of radio base stations ( It is comprised by the radio | wireless control apparatus (RNC: Radio Network Controller) which controls (hereinafter abbreviated as "base station") (FIG. 5).

  In the W-CDMA system, a higher communication speed is realized by widening using FDD (Frequency Division Duplex) or TDD (Time Division Duplex), and independent frequency resources are allocated to uplink / downlink in FDD mode. ing. The frequency band (uplink frequency band) that can be used for the uplink and the frequency band (downlink frequency band) that can be used for the downlink are defined by laws and regulations (Radio Law, etc.). For example, in the case of a 2 GHz band where a service is provided in Japan, both of the bandwidths are constant at 5.0 MHz, and the frequency difference between the upstream and downstream bands is constant at 190 MHz. For this reason, in a wireless communication system employing the W-CDMA system, when one of the uplink and downlink frequency bands is selected, the other can be determined from the frequency difference. That is, the terminal may be determined and notified of the downlink frequency (band).

  FIG. 1 is a diagram for explaining frequency information transmitted and received between a base station and a terminal defined in Non-Patent Document 3, which is one of the specifications of the W-CDMA system. As shown in FIG. 1, in the FDD mode, it is essential to notify the mobile communication device of downlink frequency information (indicated as “UARFCN downlink (Nd)” in the figure. UARFCN is an abbreviation for UTRA Absolute Radio Frequency Channel Number). MP) and uplink frequency information (indicated as “UARFCN uplink (Nu)” in the figure) is an option (OP). When the frequency difference is not constant (fixed), notification of uplink frequency information is essential (MP). The downlink frequency is determined by the radio control apparatus and is notified to the terminal via the base station.

  Information indicating the upstream frequency is represented as Nu, information representing the downstream frequency is represented as Nd, and the setting range is from 0 to 16383, so 14 bits are required to represent this. Therefore, it is notified to the terminal as a 14-bit control signal.

These frequency information Nu and Nd are defined in Non-Patent Document 1 and are created by the following equations.
Nu = 5 × (F _UL −F _{UL_offset} ) (1)
Nd = 5 × (F _DL −F _{DL_offset} ) (2)
Here, F _UL and F _DL represent the determined frequencies, and F _{UL_offset} and F _{DL_offset} represent the offset frequencies defined in FIG. For this reason, FIG. 2 is a diagram for explaining the frequency difference for each frequency band. In the table described in Non-Patent Document 1, the columns of the center frequency of the upstream and downstream bands and the upstream and downstream frequency difference are added. .

  In FIG. 2, “i” to “ix” represent frequency band numbers, respectively. Accordingly, FIG. 2 shows, for each frequency band, uplink (UL: a link transmitted from the terminal (UE) to the base station (Node B)) and downlink (DL: link transmitted from the base station to the terminal). Each assigned band and the frequency difference between these bands are shown.

  Using the above equation, frequency information Nu and Nd when the upstream frequency is 1922.4 MHz and the downstream frequency is 212.4 MHz are calculated as follows.

_{Nu = 5 × (F UL -F} UL_offset) = 5 × (1922.4-0) = 9612 (3)
Nd = 5 × (F _DL −F _{DL_offset} ) = 5 × (2112.4-0) = 10562 (4)
In the W-CDMA system, terminal performance (terminal performance) is divided into categories. Here, the terminal performance is essential information for communication such as the number of radio channels that can be simultaneously communicated. This information is used for easy management by classifying into a plurality of categories. For example, FIG. 3 is a diagram for explaining conventional categorization in the HSDPA (High-Speed Downlink Packet Access) system described in Non-Patent Document 3, and FIG. 4 is an HSUPA (High-Speed Uplink) described in Non-Patent Document 3. It is a figure explaining the categorization in a Packet Access) system. Both HSDPA and HSUPA are faster versions of W-CDMA. In FIG. 3, for each category, the maximum number of HS-DSCH (High-Speed Downlink Shared CHannel) that can be received at one time, the minimum transmission time interval (Minimum inter-TTI interval) for intermittent reception, and the HS-DSCH transmission block It shows that the maximum number of bits and the total number of bits of the soft channel are defined. In FIG. 4, for each category, the maximum number of E-DCH (Enhanced-Dedicated CHannel) that can be transmitted at one time, the minimum SF (Spreading Factor), the transmission time interval (TTI) of supported E-DCH (TTI is 10, And 2 ms), the maximum number of bits of an E-DCH transmission block transmitted with a 10 ms TTI indicates that the maximum number of bits of an E-DCH transmission block transmitted with a 2 ms TTI is defined.

  As described above, the category is indispensable information for appropriately performing communication between the base station and the terminal. For this reason, category information (for example, category number) or terminal performance information is notified from the terminal to the base station side. The notification is reflected in scheduling for selecting a transmission partner and determining a transmission method.

  Recently, a communication system has been proposed in which the uplink frequency bandwidth actually used (hereinafter “uplink bandwidth”) and the downlink frequency bandwidth (hereinafter “downlink bandwidth”) are not only different but also variable depending on the terminal performance. ing. For example, an E3G (Evolved 3G, also referred to as S3G (Super 3G)) system whose specification is being studied in 3GPP can be cited.

  In this E3G system, the frequency difference between upstream and downstream varies depending on the allocation of each bandwidth and the center frequency of each band. Therefore, unlike the conventional W-CDMA system, the uplink frequency cannot be automatically selected by selecting the downlink frequency. That is, since the uplink frequency and downlink frequency must be set separately, more control information is required and the control becomes more complicated, and the base station notifies each terminal of the control information of the uplink frequency and the downlink frequency. Must.

  Since the frequency setting may be changed during communication due to a propagation environment, scheduling, or the like, it is necessary to set the frequency at high speed. In order to perform frequency setting at high speed, at least one of reducing the number of control information to be transmitted / received, notifying frequency information (control information) with a smaller number of bits, and simplifying control is provided. It is important to make it happen. Conventionally, 14 bits are required for notification of the frequency information Nu and Nd obtained by the equations (1) and (2), respectively, so that the frequency information Nu and Nd can be notified to the terminal side with a smaller number of bits. Doing so should also be considered important.

JP 2005-341432 A JP 2000-69544 A JP 2000-175254 A JP 2006-217173 A Special table 2004-537875 gazette JP 2006-287754 A

3GPP TS 25.101 V7.4.0 (2006-06) 3GPP TS 25.306 V6.8.0 (2006-06) 3GPP TS 25.331 V6.10.0 (2006-06)

  An object of this invention is to provide the technique for enabling the frequency setting in radio | wireless communication (mobile communication) to be performed at high speed.

  The wireless communication systems according to the first to seventh aspects of the present invention are both provided with a wireless base station device and a wireless control device, and each includes the following means.

  A wireless communication system according to a first aspect includes a bandwidth variable unit that varies at least one of a first frequency bandwidth used for uplink and a second frequency bandwidth used for downlink, and a wireless terminal device (Hereinafter referred to as “terminal”), which receives and extracts terminal performance information related to the performance of the terminal, and based on the terminal performance information received and extracted by the performance information receiving means, Category setting means for specifying a terminal category to which the terminal belongs, and line setting for performing line setting with the terminal based on the terminal category specified by the category specifying means and transmitting a control signal corresponding to the line setting to the terminal Means.

  The radio communication system according to the second aspect includes a bandwidth variable means for varying at least one of a first frequency bandwidth used for uplink and a second frequency bandwidth used for downlink, and transmission from a terminal A performance information receiving means for receiving and extracting terminal performance information related to the performance of the terminal, and a category specification for specifying a terminal category to which the terminal belongs based on the terminal performance information received / extracted by the performance information receiving means And scheduling means for performing scheduling for selecting a terminal to be communicated among the terminals based on the terminal category specified by the category specifying means.

  A radio communication system according to a third aspect includes a bandwidth variable means for varying at least one of a first frequency bandwidth used for uplink and a second frequency bandwidth used for downlink, and transmission from a terminal The category information receiving means for receiving and extracting the terminal category information indicating the terminal category to which the terminal belongs, and the line setting between the terminals based on the terminal category information received and extracted by the category information receiving means. And a line setting means for transmitting a control signal corresponding to the line setting to the terminal.

  According to a fourth aspect of the present invention, there is provided a wireless communication system comprising: performance information receiving means for receiving and extracting terminal performance information related to the transmission frequency bandwidth or reception frequency bandwidth of the terminal, and the performance information receiving means transmitted from the terminal; Based on the received / extracted terminal performance information, category specifying means for specifying the terminal category to which the terminal belongs, and line setting between the radio base station apparatus and the terminal are performed based on the terminal category specified by the category specifying means. And a line setting means for transmitting a control signal according to the line setting to the terminal.

  A wireless communication system according to a fifth aspect includes a performance information receiving unit that receives and extracts terminal performance information related to a transmission frequency bandwidth or a reception frequency bandwidth of the terminal, and the performance information receiving unit, which is transmitted from the terminal. Based on the received / extracted terminal performance information, scheduling for specifying a terminal category to which the terminal belongs and scheduling for selecting a terminal to be communicated from the terminal based on the terminal category specified by the category specifying means Means.

  The wireless communication system according to the sixth aspect includes performance information receiving means for receiving and extracting terminal performance information transmitted from a terminal and relating to the difference between the transmission frequency and reception frequency of the terminal, and received by the performance information receiving means. A category specifying unit that specifies a terminal category to which the terminal belongs based on the extracted terminal performance information, and a scheduling unit that performs scheduling for selecting a terminal to be communicated from the terminal based on the terminal category specified by the category specifying unit And.

  The wireless communication system according to the seventh aspect receives category information received from and extracted from terminal category information indicating a terminal category specified based on a transmission frequency bandwidth or a reception frequency bandwidth of the terminal. And line setting means for setting a line with the terminal based on the terminal category information received / extracted by the category information receiving means and transmitting a control signal corresponding to the line setting to the terminal. It has.

  The radio communication system according to the eighth aspect is based on the premise that at least one of the first frequency bandwidth used for uplink and the second frequency bandwidth used for downlink corresponds to a variable terminal. Receiving a performance information receiving means for receiving and extracting the terminal performance information relating to the performance of the terminal transmitted from the terminal, and the terminal category to which the terminal belongs based on the terminal performance information received / extracted by the performance information receiving means. Category specifying means for specifying, line setting means for performing line setting with the terminal based on the terminal category specified by the category specifying means, and causing the terminal to transmit a control signal corresponding to the line setting, It has.

  In the present invention, terminal performance information associated with a terminal category or terminal category information indicating the terminal category is transmitted from the terminal, whereby the terminal category is specified on the wireless communication system side, and the terminal is determined based on the specified terminal category. And a control signal (information) corresponding to the line setting is transmitted to the terminal. The line setting (frequency setting in wireless communication) is performed in a form that limits the settable range in one or more setting items associated with the terminal category. By so limiting, the frequency setting is further simplified. Therefore, the frequency setting itself can be performed at a higher speed. The same applies to the case where the frequency setting associated with the scheduling is performed. The terminal performance information is information indicating the content of at least one of the setting items. For example, the frequency bandwidth that can be received by the terminal (transmission frequency bandwidth) and the frequency bandwidth that can be transmitted by the terminal (reception frequency band) Width) or a frequency difference (a difference between a transmission frequency and a reception frequency) that can be transmitted / received by the terminal can be employed.

  In the present invention, when line setting with a terminal or frequency setting by scheduling is performed, a downlink frequency indicating a downlink frequency band determined by the frequency setting and an uplink frequency indicating an uplink frequency band are selected. On the other hand, a control signal (information) is created using the other expressed by the frequency difference between the downlink frequency and the uplink frequency, and transmitted to the terminal. The number of bits necessary for expressing the frequency difference can be made smaller than the number of bits required for expressing the uplink frequency and the downlink frequency. For this reason, the control signal (information) can be set to a smaller number of bits. Thereby, speeding up of the frequency setting becomes easier.

  This is because at least one of a downlink frequency indicating a downlink frequency band determined by frequency setting and an uplink frequency indicating an uplink frequency band is defined as reference frequency information indicating a reference frequency determined in advance, and the reference frequency and the reference frequency When notifying by creating a control signal (information) using the frequency difference between one side and transmitting it to the terminal, and between at least one of the downlink frequency and the uplink frequency and a reference frequency set as a reference in advance The same applies to the case where a control signal (information) is generated using the frequency difference and is transmitted to the terminal.

  In the present invention, frequency setting in wireless communication (mobile communication) can be performed at high speed.

It is a figure explaining the frequency information conventionally transmitted / received between a base station and a terminal. It is a figure explaining the frequency difference for every frequency band. It is a figure explaining the conventional categorization in a HSDPA (High-Speed Downlink Packet Access) system. It is a figure explaining the conventional categorization in a HSUPA (High-Speed Uplink Packet Access) system. It is a figure which shows the structure of the radio | wireless communications system by 1st Embodiment. It is a block diagram of the radio | wireless communication apparatus mounted in the terminal which can utilize the radio | wireless communications system by 1st Embodiment. It is a block diagram of the apparatus setting control part of the radio | wireless communication apparatus mounted in the terminal which can utilize the radio | wireless communications system by 1st Embodiment. It is a block diagram of the radio | wireless communication apparatus mounted in the base station which comprises the radio | wireless communications system by 1st Embodiment. It is a block diagram of the circuit setting part of the radio | wireless communication apparatus mounted in the base station which comprises the radio | wireless communications system by 1st Embodiment. It is a figure explaining the terminal performance information linked | related with the terminal category in 1st Embodiment. It is a block diagram of the modification of the radio | wireless communication apparatus mounted in the terminal which can use the radio | wireless communications system by 1st Embodiment. It is a block diagram of the radio | wireless communication apparatus mounted in the terminal which can utilize the radio | wireless communications system by 2nd Embodiment. It is a block diagram of the radio | wireless communication apparatus mounted in the base station which comprises the radio | wireless communications system by 2nd Embodiment. It is a block diagram of the radio | wireless communication apparatus mounted in the terminal which can utilize the radio | wireless communications system by 4th Embodiment. It is a block diagram of the radio | wireless communication apparatus mounted in the base station which comprises the radio | wireless communications system by 4th Embodiment. It is a figure which shows the example of numbering with respect to a subcarrier. It is a figure explaining grouping of a subcarrier. It is a figure explaining the modification of the terminal performance information linked | related with the terminal category in 1st Embodiment. It is a figure explaining a mode that a use frequency band is moved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<First Embodiment>
FIG. 5 is a diagram illustrating a configuration of the wireless communication system according to the first embodiment. The wireless communication system is for realizing a mobile communication service compatible with, for example, E3G, that is, OFDMA (Orthogonal Frequency Division Multiple Access). As shown in FIG. 5, a plurality of radio base stations (Node B, hereinafter abbreviated as “base station”) 51 that communicate with a mobile terminal apparatus (UE: User Equipment; hereinafter abbreviated as “terminal”) 52 are arranged, A plurality of base stations 51 are controlled by a radio network controller (RNC: Radio Network Controller) 53.

  FIG. 6 is a configuration diagram of a wireless communication apparatus mounted on the terminal. As shown in FIG. 6, the wireless communication apparatus includes an antenna 61, two wireless units 62 and 63, an encoding / modulating unit 64, a demodulation / decoding unit 65, a terminal performance information storage unit 66 storing terminal performance information, and a terminal An information signal creation unit 67, a control signal extraction unit 68, and a device setting control unit 69 are provided. Hereinafter, “66” is added to the terminal performance information to clarify the storage location.

  Transmission data to be transmitted is encoded and modulated by the encoder / modulator 64. An RF signal obtained by the modulation is transmitted from the antenna 61 via the radio unit 62.

  On the other hand, the RF signal received by the antenna 61 is extracted by the radio unit 63 only for the signal of the selected frequency bandwidth and sent to the demodulation / decoding unit 65. The demodulation / decoding unit 65 demodulates and decodes the RF signal from the radio unit 63 and outputs the obtained data as reception data.

  FIG. 7 is a configuration diagram of the device setting control unit. As shown in FIG. 7, the device control unit 69 includes a modulation / demodulation method / coding / decoding method calculation unit 71, a transmission / reception frequency calculation unit 72, a transmission / reception bandwidth calculation unit 73, a demodulation method / decoding method setting unit 74, and a reception use frequency setting. Unit 75, reception use bandwidth setting unit 76, transmission use bandwidth setting unit 77, transmission use frequency setting unit 78, and modulation method / coding method setting unit 79.

  FIG. 8 is a configuration diagram of a wireless communication apparatus mounted on the base station. As shown in FIG. 8, the communication apparatus includes an antenna 81, two radio units 82 and 83, a demodulation / decoding unit 85, an encoding / modulation unit 84, a terminal information extraction unit 86, and a control signal creation unit 88. I have. The line setting unit 87 and the terminal category setting unit 101 are prepared on the base station 51 side (wireless communication system side), but may be mounted on either the base station 51 or the radio network controller 52. . The wireless communication system according to the present embodiment is realized by preparing the wireless communication apparatus shown in FIG.

  Transmission data to be transmitted is encoded and modulated by the encoder / modulator 85. An RF signal obtained by the modulation is transmitted from the antenna 81 via the radio unit 83.

  On the other hand, the RF signal received by the antenna 81 is extracted for each selected frequency bandwidth by the radio unit 83 and sent to the demodulation / decoding unit 84. The demodulation / decoding unit 84 demodulates and decodes the RF signal from the radio unit 84. The data obtained thereby is output as received data.

  FIG. 9 is a configuration diagram of the line setting unit. As shown in FIG. 9, the line setting unit 87 includes a modulation / demodulation method / coding / decoding method calculation unit 91, a transmission / reception frequency calculation unit 92, a transmission / reception bandwidth calculation unit 93, a demodulation method / decoding method setting unit 94, and a transmission use frequency. A setting unit 95, a transmission use bandwidth setting unit 96, a reception use bandwidth setting unit 97, a reception use frequency setting unit 98, and a demodulation method / decoding method setting unit 99 are provided.

  The terminal 52 is classified according to a terminal category corresponding to E3G. The actually used uplink frequency bandwidth (hereinafter “uplink bandwidth”) and downlink frequency bandwidth (hereinafter “downlink bandwidth”) can be set separately. Since the upstream frequency band and the downstream frequency band change depending on their bandwidth, in addition to the information on each bandwidth, information indicating the bandwidth is essential for each bandwidth. As a result, compared with the case where each bandwidth is constant, more control information is required and the control is complicated. In the present embodiment, the complexity of the control is suppressed as follows. Here, for convenience, the center frequency of the band is assumed as information indicating the band. The information may be another one as long as the frequency band can be specified, for example, the minimum or maximum frequency.

  FIG. 10 is a diagram illustrating terminal performance information associated with a terminal category in the present embodiment.

  In this embodiment, as shown in FIG. 10, a modulation scheme, a downlink bandwidth, an uplink bandwidth, and a maximum frequency difference between these bands are determined in association with a terminal category. The terminal 52 prepares at least one of a modulation scheme, an uplink bandwidth, a downlink bandwidth, and a maximum frequency difference as terminal performance information 66, and the information 66 is transmitted by the terminal information signal creation unit 67 to the transmission data (terminal Information signal) and transmitted to the base station 51 using a predetermined channel. Here, for the sake of convenience, the information shown in FIG. 10 is referred to as general terminal category information.

  As shown in FIG. 10, the number of contents of each piece of information associated with each other is two for the modulation scheme, and three for the uplink / downlink bandwidth and the maximum frequency difference. For this reason, the terminal performance information 66 of the modulation scheme can be transmitted as 1-bit information. Other information can be transmitted as 2-bit information.

  As shown in FIG. 7, the demodulation / decoding unit 65 includes a demodulation unit 65a and a decoding unit 65b, and the encoding / modulation unit 64 includes a modulation unit 64a and an encoding unit 64b. The terminal performance information 66 is sent to the calculation units 71 to 3 that constitute the device setting control unit 69. As a result, the modulation / demodulation method / coding / decoding method calculation unit 71 determines the demodulation method and decoding method from the terminal performance information 66, and the demodulation unit 65a and decoding unit 65b are connected via the demodulation method / decoding method setting unit 74. In addition to controlling, the modulation method and the coding method are determined, and the modulation unit 64a and the coding unit 64b are controlled via the modulation method / coding method setting unit 79. Similarly, the transmission / reception frequency calculation unit 72 calculates a downlink frequency (a reception use frequency (a center frequency of a used downlink frequency band)) and an uplink frequency (a transmission use frequency (a center frequency of a used uplink frequency band)). Based on the downlink frequency calculation result, the reception use frequency setting unit 75 creates an oscillation frequency setting signal of the local oscillator inside the reception radio unit 63 and controls the reception radio unit 63. Similarly, based on the uplink frequency calculation result, the transmission use frequency setting unit 78 creates a setting signal for the oscillation frequency of the local oscillator in the transmission radio unit 62 and controls the radio unit 62. The transmission / reception bandwidth calculation unit 73 calculates the downlink bandwidth and the uplink bandwidth from the control signal. Based on the calculated reception bandwidth, the reception use bandwidth setting unit 76 calculates a filter setting signal inside the reception radio unit 63 and a filter inside the demodulation unit 65a, and controls the reception radio unit 63 and the demodulation unit 65a. Do. Further, an FFT setting signal inside the demodulator 65a is calculated, and the demodulator 65a is controlled. Similarly, based on the calculated transmission bandwidth, the transmission bandwidth setting unit 78 calculates a filter setting signal in the transmission radio unit 62 and a filter in the modulation unit 64a, and controls the transmission radio unit 62 and the modulation unit 64a. I do. Further, the setting signal of the FFT unit in the modulation unit 64a is calculated, and the modulation unit 64a is controlled.

  As shown in FIG. 8, the terminal performance information 66 transmitted to the base station 51 via the terminal information signal generator 67 is received, demodulated / decoded, and output from the demodulator / decoder 84 as received data. The terminal information extraction unit 86 extracts the terminal performance information 66 present in the received data and sends it to the terminal category setting unit 101. The setting unit 101 includes a storage unit that stores general terminal category information as shown in FIG. 10, for example. Therefore, by referring to the comprehensive terminal category information using the extracted terminal performance information 66, the terminal category to which the terminal 52 that transmitted the terminal performance information 66 belongs is specified, and the result is notified to the line setting unit 87. To do. The line setting unit 87 performs line setting for the terminal 52 in accordance with the notified terminal category, and notifies the control signal creation unit 88 of control information to be transmitted to the terminal 52, whereby the control signal is transmitted. Create and send.

  As shown in FIG. 9, the encoding / modulating unit 85 includes a modulating unit 85a and an encoding unit 85b, and the demodulating / decoding unit 84 includes a demodulating unit 84a and a decoding unit 84b. The line setting unit 87 basically has the same configuration as the device setting control unit 69 shown in FIG. The terminal category specified by the terminal category setting unit 101 is sent to the calculation units 91 to 3 constituting the line setting unit 87. Accordingly, the modulation / demodulation method / coding / decoding method calculation unit 91 determines the modulation method and the coding method from the terminal category, and the coding unit 85a and the modulation unit 85b via the modulation method / coding method setting unit 94. , The demodulation method and the decoding method are determined, and the demodulation unit 84a and the decoding unit 84b are controlled via the demodulation method / decoding method setting unit 99. Similarly, the transmission / reception frequency calculation unit 92 determines a downlink frequency (a reception use frequency (a center frequency of a used downlink frequency band)) and an uplink frequency (a transmission use frequency (a center frequency of a used uplink frequency band)). Thus, the radio unit 83 is controlled via the transmission use frequency setting unit 95, and the radio unit 82 is controlled via the reception use frequency setting unit 98. The transmission / reception bandwidth calculation unit 93 controls the radio unit 93 and the modulation unit 85a via the transmission usage bandwidth setting unit 96 by determining the downstream bandwidth and the upstream bandwidth, respectively, and the reception usage bandwidth setting unit. The wireless unit 82 and the demodulating unit 84 a are controlled via the wireless communication unit 97.

  Each of the calculation units 91 to 3 notifies the control signal creation unit 88 of information indicating the determined content as control information. Thereby, control information necessary for communication is transmitted to the terminal 52.

  As shown in FIG. 7, the control information transmitted from the base station 51 is received, demodulated / decoded, and output from the demodulator / decoder 65 as received data. The control signal extraction unit 68 extracts the control information present in the received data and sends it to the device setting control unit 69. Thereby, after receiving the control information, the device setting control unit 69 controls each unit according to the control information.

  As described above, in the present embodiment, information that is not originally included is associated with the terminal category, and the associated information is reflected in the line setting. The contents of the associated information are limited to those that do not deviate from the classification by the terminal category. For this reason, the management of the terminal becomes easier and the control thereof becomes easier. As a result, frequency setting such as line setting can be performed at higher speed.

  In this embodiment, the terminal performance information 66 is transmitted to the base station 51, but the terminal category may be notified instead of the terminal performance information 66. For example, as shown in FIG. 11, a terminal category setting unit 111 for specifying and setting a terminal category is prepared from the terminal performance information 66, and the terminal information signal creating unit 67 and device setting control unit are included in the setting unit 111. 69 can be realized.

  By the way, there are many combinations of upstream and downstream bandwidths. For example, assuming 1.25 MHz, 2.5 MHz, and 5.0 MHz as the upstream bandwidth, assuming 5.0 MHz, 10 MHz, and 20 MHz as the downstream bandwidth, the bandwidth of the entire system is 20 MHz downstream, and 5 MHz upstream. Assuming that in the 2 GHz band, the number of combinations is 63 as follows.

4 × (4 + 2 + 1) + 2 × (4 + 2 + 1) + 1 × (4 + 2 + 1) = 9 × 7 = 63
In Japan, as shown in FIG. 2, there are three usable frequency bands. For this reason, in consideration of the number of bands, the number of combinations is 189 (= 63 × 3). If category classification is performed so that all combinations can be recognized, the number of categories becomes very large, management thereof becomes complicated, and the number of necessary control information increases. In order to avoid this, in this embodiment, the categorization as shown in FIG. 10 is suppressed. Note that “4”, “2”, and “1” in the above formula take, for example, four positions in the upstream bandwidth at 1.25 MHz, two positions at 2.5 MHz, and one position at 5.0 MHz. It means that it is possible.

One wireless technology is MIMO. The MIMO is an abbreviation of “Multiple Input Multiple Output”, and data is transmitted / received by a plurality of antennas. Therefore, as information associated with the terminal category, as shown in FIG. 18, MIMO transmission information indicating whether transmission using MIMO is possible, and MIMO reception information indicating whether reception using MIMO are possible. At least one of them may be added as MIMO information. Alternatively, it may be added as a substitute for other information.
<Second Embodiment>
In mobile communication, a mobile body (terminal) may move to an area covered by a different base station. A handover is implemented to accommodate such movement. When a handover is performed, there is a case where the allocation of frequency resources, that is, uplink / downlink frequencies and at least one of those bandwidths is changed. In the second embodiment, the number of bits of control information transmitted / received to change the allocation of frequency resources at the time of handover is further suppressed.

  At the time of handover, the terminal is already communicating with one or more base stations. That is, uplink / downlink frequencies and their bandwidths are already allocated. In the second embodiment, paying attention to this, the number of bits required for the control information is reduced, and the time required for the transmission is further reduced.

  The configurations of the terminal and the base station in the second embodiment are basically the same as those in the first embodiment. For this reason, the same or basically the same components as those in the first embodiment are used as they are, and the same reference numerals used in the first embodiment are used as they are, and only the portions different from those in the first embodiment are noted. explain.

  FIG. 12 is a configuration diagram of a wireless communication device mounted on a terminal according to the second embodiment. As shown in FIG. 12, in addition to the configuration in the first embodiment, the received electric field strength measuring unit 121 that measures the received electric field strength from the received data for each base station 51 and the measurement result by the measuring unit 121 are A reception field strength information creation unit 122 for notifying the station 51 side is further provided. The creation unit 122 transmits the measurement result to the base station 51 as received electric field strength information. The wireless terminal device according to the second embodiment is realized by mounting the wireless communication device shown in FIG. The same applies to other embodiments described later.

  On the other hand, as shown in FIG. 13, the base station 51 side extracts received field strength information for extracting the received field strength information received from the terminal 52 from the received data in addition to the configuration in the first embodiment. Unit 131 and a handover control unit 132 that determines the necessity of handover based on the received field strength information extracted by the extraction unit 131.

  The handover control unit 132 is prepared in the base station 51 or the radio control device 53. The necessity of handover is determined by referring to the received electric field strength information transmitted from the terminal 52 for each base station 51, and the determination result is notified to the line setting unit 87. Based on the notification, the base station 51 having the highest received electric field strength is caused to communicate with the terminal 52. Therefore, the line setting unit 87 performs line setting with the terminal 52 to be communicated when the necessity of handover is notified. Using the terminal performance information 66 of the terminal 52, the terminal category is specified and the line is set. If the content of the line setting is different from the previous one, the control information to be transmitted to the terminal 52 is sent to the control signal creating unit 88 and the control signal is transmitted.

The following is transmitted as the control signal.
Assuming that the information indicating the downlink frequency is Nd, the downlink frequency information Nd is created by the above-described equation (2).

Similarly, if the information indicating the uplink frequency is Nu, the uplink frequency information Nu is created by the following equation using the downlink frequency F _DL and the determined uplink frequency F _UL .

Nu = 5 × (F _DL -F _UL ) (5)
The downlink frequency information Nd requires 14 bits as described above. However, the uplink frequency information Nu is the UMTS 1.7 / 2.1 of the frequency band number iv having the maximum uplink / downlink frequency difference of 490 MHz in FIG.
Nu = 5 × 490 = 2450
Therefore, it can be expressed by 12 bits. For this reason, the number of bits can be reduced as compared with the case where the uplink frequency information Nu is created by the expression (2). By the reduction, the frequency setting accompanying the line setting or the like can be performed at a higher speed. The transmission / reception frequency calculation unit 92 calculates the frequency information Nu and Nd.

The uplink / downlink frequency information Nu and Nd is transmitted as a control signal to the terminal 52 and extracted by the control signal extraction unit 68. Device setting control unit 69 calculates the uplink frequency F _UL uplink / downlink frequency information Nu, from Nd, after the calculation, calculates downlink frequency F _DL. Thereby, the setting according to the control signal transmitted from the base station 51 is performed. The calculation of these frequencies F _UL and F _DL is performed by the transmission / reception frequency calculation unit 72 of FIG.

In the present embodiment, as the downlink frequency information Nd, the information created by the equation (5) is transmitted together with the uplink frequency information Nu, but the reverse is also possible. That is, the uplink frequency information Nu may be created using a formula similar to the formula (2), and the downlink frequency information Nd may be created using a formula similar to the formula (5). Further, the base station side determines one of the uplink / downlink frequencies and notifies the terminal 52, and the terminal 52 determines and notifies the other with reference to the comprehensive terminal category information as shown in FIG. Also good.
<Third Embodiment>
In the first and second embodiments, at least one of the uplink and downlink frequencies is directly notified from the base station 51 to the terminal 52. In contrast, in the third embodiment, at least one of the uplink and downlink frequencies is defined as a reference in advance, and the uplink and downlink frequencies are notified using the determined reference frequency, so that the control information (signal ) Is further reduced in the number of bits required for transmission.

  The configurations of the terminal and base station in the third embodiment are basically the same as those in the first embodiment. For this reason, the same or basically the same components as those in the first embodiment are used as they are, and the same reference numerals used in the first embodiment are used as they are, and only the portions different from those in the first embodiment are noted. explain. Here, a case will be described as an example where each frequency band of uplink / downlink and the frequency difference between the bands are determined as shown in FIG.

  The line setting unit 87 on the base station 51 side determines the downlink frequency to be assigned to the terminal 52 in consideration of the line usage status and the like. At this time, a control signal is created using a predetermined frequency band number or its center frequency and at least one of the difference between the center frequency and the actually determined uplink and downlink frequencies. . Since the center frequency is used as a reference, it will be referred to as “reference frequency” hereinafter.

The frequency band numbers 1 to 9 can be expressed by 4 bits. The difference between the reference frequency and the upstream frequency can be expressed by 8 bits even if 70 MHz is assumed as the maximum system bandwidth. In this case, for example, the reference frequency is f _{S_DL} , the determined downlink frequency is f _DL , downlink frequency information indicating the difference is Nd, and the frequency information Nd is created by the following equation.

Nd = 2 × (f _S — _DL −f _DL ) (6)
For this reason, control information indicating the downlink frequency can be expressed by a total of 12 bits. Therefore, the control information can be transmitted with a smaller number of bits. As a result, the frequency can be set faster.

  Actually, when a downlink frequency band having a center frequency of 877.5 MHz is determined with reference to UMTS 800 (frequency band number vi), the reference frequency is set to 880 MHz of the center frequency, which is a difference from 877.5 MHz. When the control information is created using .5 MHz, the band number 6 can be expressed as “0110”, and 2.5 MHz is “00000001” according to the equation (6), so “0110000000101”.

In the present embodiment, the control information is created based on the difference between the band number and the reference frequency, but the order may be reversed. The difference is a difference between the reference frequency and the downlink frequency, but may be a difference between the reference frequency and the uplink frequency. The difference is, for example, Nu = 2 × (f _{S_UL} −f _UL ) (7) where Nu is the frequency information, f _{S_UL} is the uplink reference frequency, and f _UL is the determined uplink frequency.
Should be created. Since such frequency information Nd and Nu can both reduce the number of bits required, any of them may be transmitted. The reference frequency band number or reference frequency may be stored in advance in the storage device.
<Fourth embodiment>
In mobile (wireless) communication, scheduling for selecting a transmission partner and determining a transmission method is usually performed. The fourth embodiment corresponds to the scheduling.

  The configurations of the terminal and base station in the fourth embodiment are basically the same as those in the first embodiment. For this reason, as in the second and third embodiments, the same or basically the same components as those in the first embodiment are used as they are. A description will be given in a manner that focuses only on portions that differ from the first embodiment.

  FIG. 14 is a configuration diagram of a wireless communication device mounted on a terminal according to the fourth embodiment. As shown in FIG. 14, in addition to the configuration in the first embodiment, the transmission power and the interference power are measured by receiving the pilot signal transmitted from the base station 51, the SIR is calculated, and the CQI (Channel Quality A CQI measurement unit 141 for measuring (Indicator) and a CQI creation unit 142 for transmitting the measurement result to the base station 51 are further provided. The creation unit 142 transmits the CQI measurement result to the base station 51 as CQI information. The transmission is performed on HS-DPCCH (Dedicated Physical Control CHannel (uplink) for HS-DSCH).

  On the other hand, the base station 51 side, as shown in FIG. 15, in addition to the configuration in the first embodiment, a CQI information extraction unit 151 for extracting CQI information received from the terminal 52 from received data, and A scheduler unit 152 that performs scheduling using the CQI information extracted by the extraction unit 151 is further provided.

The scheduler unit 152 refers to the CQI information extracted for each terminal 52 by the CQI information extraction unit 151 and selects the terminal 52 to be transmitted, and also includes a modulation scheme, a coding rate, a data length, a bandwidth, and a used frequency. Select from the terminal category. The terminal category is notified from the terminal 52 to the base station 51 as a terminal information signal, or is notified from the terminal category setting unit 101 by the terminal performance information 66 transmitted by the terminal 52. By transmitting the selection result to the control signal creation unit 88, it is transmitted as a control signal to the corresponding terminal 52. As described above, since the terminal 52 is managed by the terminal category (terminal performance information 66), the control is simplified as in the first embodiment. The simplification makes it possible to set the frequency at a higher speed.
<Fifth embodiment>
In OFDMA, as is well known, all users (terminal 52) share all subcarriers, and frequency utilization efficiency can be improved by assigning subcarriers with good transmission characteristics for each user. In the fifth embodiment, control information is generated by paying attention to subcarriers.

  The configurations of the terminal and the base station in the fifth embodiment are basically the same as those in the first embodiment. For this reason, as in the second to fourth embodiments, the same or basically the same components as those in the first embodiment are used as they are. A description will be given in a manner that focuses only on portions that differ from the first embodiment.

  FIG. 16 is a diagram illustrating an example of numbering for subcarriers. In the present embodiment, as shown in FIG. 16, a smaller number is assigned to a subcarrier as the frequency is lower. The number assigned to the subcarrier with the lowest frequency is 1. Here, it is assumed that the base station 51 side and the terminal 52 share in advance the subcarrier number, the frequency of the subcarrier to which the number is assigned, and the subcarrier bandwidth.

  The line setting unit 87 on the base station 51 side refers to the comprehensive terminal category information (FIG. 10) using, for example, the terminal category specified by the terminal performance information 66 received from the terminal 52, and assigns the uplink and downlink bandwidth, the uplink And the downlink frequency, that is, the group is determined. At this time, for example, the number of the subcarrier located at the center of the group is specified from the determined downlink frequency, and the number of subcarriers is specified from the downlink bandwidth. The identification of the subcarrier number and the number of subcarriers is performed in the same manner for the uplink frequency and the uplink bandwidth. The control signal generator 88 is notified of the subcarrier number and the number of subcarriers thus specified as control information and transmitted. The subcarrier number is specified by the transmission / reception frequency calculation unit 92, and the number of subcarriers is specified by the transmission / reception bandwidth calculation unit 93.

  On the other hand, the control signal extraction unit 68 of the terminal 52 extracts the control information (signal) received from the base station 51 from the received data and notifies the device setting control unit 69 of it. The subcarrier number and the number of subcarriers in the control signal are sent to the transmission / reception frequency calculation unit 72 and the transmission / reception bandwidth calculation unit 73, respectively. Thereby, the transmission / reception frequency calculation unit 72 calculates a frequency corresponding to the subcarrier number, and the transmission / reception bandwidth calculation unit 73 calculates a bandwidth corresponding to the number of subcarriers.

  By employing such a subcarrier number and the number of subcarriers as control information (signal), it is possible to arbitrarily allocate resources in units of subcarriers. The number of bits necessary for expressing the subcarrier number and the number of subcarriers depends on the total number of subcarriers. However, since the frequency and bandwidth can be individually managed by the subcarrier number and the number of subcarriers, the control can be simplified. As a result, the frequency can be set faster.

In this embodiment, the combination of the subcarrier number and the number of subcarriers is transmitted as a control signal, but another combination may be used. For example, the frequency may be adopted instead of the subcarrier number. Alternatively, as in the third embodiment, a reference frequency may be determined in advance and a difference from the reference frequency may be employed. In addition, as shown in FIG. 17, a plurality of subcarriers may be grouped, a unique number is assigned to each group, and for example, a combination of a subcarrier number and a group number may be transmitted as a control signal. Since the frequency bandwidth assigned to each group and its position on the frequency axis are usually unique, only the group number may be transmitted as a control signal. Even if only the group number is notified, by preparing information for specifying the frequency bandwidth and the position of each group on the terminal 52 side, the terminal 52 can detect the corresponding frequency bandwidth from the group information and The position can be specified. For this reason, the information employed as the control signal can be variously modified. The control signal may be transmitted at the time of line setting, but may be transmitted when a terminal to be transmitted is determined by scheduling.
<Sixth Embodiment>
In mobile communication, cell selection during line setup or handover, and synchronization during standby may be performed using the center frequency of the bandwidth that can be used by the base station. At this time, CPICH (Common Pilot Channel) for transmitting a common pilot signal from the base station, SCH (Synchronization CHannel) for transmitting a synchronization signal, PCH (Paging CHannel) for transmitting a standby signal, BCH (Broadcast for transmitting system information) A predetermined frequency (for example, the center frequency of the system frequency band; hereinafter referred to as “initial use frequency”) is used for the PICH (Paging Indicator CHannel) that notifies the terminal of the presence or absence of an incoming call. Transmission from the base station to the terminal uses a predetermined bandwidth (hereinafter referred to as “initial use bandwidth”). In the sixth embodiment, attention is paid to this point, and control information is created.

  The configurations of the terminal and the base station in the sixth embodiment are basically the same as those in the first embodiment. For this reason, as in the second to fifth embodiments, the same or fundamentally the same as the first embodiment is used without changing the reference numerals given in the first embodiment. A description will be given in a manner that focuses only on portions that differ from the first embodiment.

  The frequency and bandwidth used for transmitting each signal are transmitted from the base station 51 to the terminal 52 using PCH or the like. The transmission is performed, for example, by creating a control signal as described in the second embodiment. The initial use frequency and the initial use bandwidth may be stored in advance on the terminal side.

  When a frequency band is moved after establishing a wireless line, the center frequency of the frequency band is used for transmission of the signal performed before the movement. In the sixth embodiment, a control signal is created and transmitted as in the third embodiment with the center frequency as a reference frequency. In addition, a control signal indicating the bandwidth to be used is created and transmitted. Thereby, the number of bits required for the control signal can be further reduced, and the frequency setting can be made faster. FIG. 19 is a diagram for explaining how to move the used frequency band.

  In the present embodiment (first to sixth embodiments), the line setting unit 87 and scheduler unit 152 on the base station 51 side (wireless communication system side), and the device setting control unit 69 of the terminal 52 are Both are realized by a CPU that executes a program, a DSP, or the like. Depending on the configuration of an existing wireless communication system or terminal, the present invention can be applied by changing a program executed by a CPU or a DSP. Therefore, a program for realizing the wireless communication system or the terminal according to the present invention may be prepared, and the program may be recorded on a recording medium such as a flash memory or a CD-ROM and distributed. Or you may enable it to deliver via a communication network.

51 Radio base station 52 Mobile terminal equipment (UE)
53 Radio Control Device 81 Antenna 82, 83 Radio Unit 84 Encoding / Modulation Unit 85 Demodulation / Decoding Unit 86 Terminal Information Extraction Unit 87 Line Setting Unit 88 Control Signal Creation Unit 101 Terminal Category Setting Unit 151 CQI Information Extraction Unit 152 Scheduler Unit

Claims (16)

In a wireless communication system including a wireless base station device and a wireless terminal device,
Bandwidth varying means for varying at least one of the first frequency bandwidth used for uplink and the second frequency bandwidth used for downlink;
Performance information receiving means for receiving and extracting terminal performance information related to the first or second frequency bandwidth of the wireless terminal device transmitted from the wireless terminal device;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs, based on terminal performance information related to the first or second frequency bandwidth received and extracted by the performance information receiving means;
Line setting means for performing line setting with the wireless terminal device based on the terminal category specified by the category specifying means and transmitting a control signal corresponding to the line setting to the wireless terminal device;
A wireless communication system comprising: In a wireless communication system including a wireless base station device and a wireless terminal device,
Bandwidth varying means for varying at least one of the first frequency bandwidth used for uplink and the second frequency bandwidth used for downlink;
Performance information receiving means for receiving and extracting terminal performance information related to the first or second frequency bandwidth of the wireless terminal device transmitted from the wireless terminal device;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs, based on terminal performance information related to the first or second frequency bandwidth received and extracted by the performance information receiving means;
Scheduling means for performing scheduling for selecting a wireless terminal device to be communicated from the wireless terminal device based on the terminal category specified by the category specifying means;
A wireless communication system comprising: In a wireless communication system including a wireless base station device and a wireless terminal device,
Bandwidth varying means for varying at least one of the first frequency bandwidth used for uplink and the second frequency bandwidth used for downlink;
Category information transmitted from a wireless terminal device and received and extracted from terminal category information indicating a terminal category specified based on terminal performance information related to the first or second frequency bandwidth of the wireless terminal device Receiving means;
Line setting means for performing line setting with the wireless terminal apparatus based on terminal category information received / extracted by the category information receiving means, and causing the wireless terminal apparatus to transmit a control signal corresponding to the line setting When,
A wireless communication system comprising: In a wireless communication system including a wireless base station device and a wireless terminal device,
Performance information receiving means for receiving and extracting terminal performance information related to the transmission frequency bandwidth or reception frequency bandwidth of the wireless terminal device transmitted from the wireless terminal device;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs, based on terminal performance information related to the transmission frequency bandwidth or the reception frequency bandwidth received and extracted by the performance information receiving means;
A line for setting a line between the radio base station apparatus and the radio terminal apparatus based on the terminal category specified by the category specifying unit and transmitting a control signal corresponding to the line setting to the radio terminal apparatus Setting means;
A wireless communication system comprising: In a wireless communication system including a wireless base station device and a wireless terminal device,
Performance information receiving means for receiving and extracting terminal performance information related to the transmission frequency bandwidth or reception frequency bandwidth of the wireless terminal device transmitted from the wireless terminal device;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs, based on terminal performance information related to the transmission frequency bandwidth or the reception frequency bandwidth received and extracted by the performance information receiving means;
Scheduling means for performing scheduling for selecting a wireless terminal device to be communicated from the wireless base station device and the wireless terminal device based on the terminal category specified by the category specifying means;
A wireless communication system comprising: In a wireless communication system including a wireless base station device and a wireless terminal device,
Performance information receiving means for receiving and extracting terminal performance information related to the difference between the transmission frequency and the reception frequency of the wireless terminal device transmitted from the wireless terminal device;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs, based on terminal performance information related to the difference between the transmission frequency and the reception frequency received and extracted by the performance information receiving means;
Scheduling means for performing scheduling for selecting a wireless terminal device to be communicated from the wireless base station device and the wireless terminal device based on the terminal category specified by the category specifying means;
A wireless communication system comprising: In a wireless communication system including a wireless base station device and a wireless terminal device,
Category information receiving means for receiving and extracting terminal category information indicating a terminal category, which is specified based on terminal performance information related to the transmission frequency bandwidth or reception frequency bandwidth of the wireless terminal device, transmitted from the wireless terminal device When,
Line setting means for performing line setting with the wireless terminal apparatus based on terminal category information received / extracted by the category information receiving means, and causing the wireless terminal apparatus to transmit a control signal corresponding to the line setting When,
A wireless communication system comprising: In a wireless communication system corresponding to a wireless terminal device in which at least one of a first frequency bandwidth used for uplink and a second frequency bandwidth used for downlink is variable,
Performance information receiving means for receiving and extracting terminal performance information related to the first or second frequency bandwidth of the wireless terminal device transmitted from the wireless terminal device;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs, based on terminal performance information related to the first or second frequency bandwidth received and extracted by the performance information receiving means;
Line setting means for performing line setting with the wireless terminal device based on the terminal category specified by the category specifying means and transmitting a control signal corresponding to the line setting to the wireless terminal device;
A wireless communication system comprising: In a wireless terminal device of a wireless communication system comprising a wireless base station device and a wireless terminal device,
Bandwidth varying means for varying at least one of the first frequency bandwidth used for uplink and the second frequency bandwidth used for downlink;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs based on terminal performance information relating to the first or second frequency bandwidth;
A wireless terminal device comprising: Terminal category notifying means for notifying the radio base station apparatus of the specified terminal category
The wireless terminal device according to claim 9, comprising: In a radio base station apparatus of a radio communication system including a radio base station apparatus and a radio terminal apparatus,
Bandwidth varying means for varying at least one of the first frequency bandwidth used for uplink and the second frequency bandwidth used for downlink;
Category information receiving means for receiving terminal category information indicating a terminal category specified based on terminal performance information related to the first or second frequency bandwidth of the wireless terminal device, transmitted from the wireless terminal device; ,
Line setting means for performing line setting with the wireless terminal device based on the category information and causing the wireless terminal device to transmit a control signal corresponding to the line setting;
A radio base station apparatus comprising: In a radio base station apparatus of a radio communication system including a radio base station apparatus and a radio terminal apparatus,
Bandwidth varying means for varying at least one of the first frequency bandwidth used for uplink and the second frequency bandwidth used for downlink;
Category information receiving means for receiving terminal category information indicating a terminal category specified based on terminal performance information related to the first or second frequency bandwidth of the wireless terminal device, transmitted from the wireless terminal device; ,
Scheduling means for performing scheduling for selecting a wireless terminal device to be communicated from the wireless terminal device based on the terminal category information;
A radio base station apparatus comprising: In a wireless terminal device of a wireless communication system comprising a wireless base station device and a wireless terminal device,
Bandwidth varying means for varying at least one of the transmission frequency bandwidth and the reception frequency bandwidth;
Category specifying means for specifying a terminal category to which the wireless terminal device belongs based on terminal performance information related to the transmission frequency bandwidth or the reception frequency bandwidth;
A wireless terminal device comprising: Terminal category notification means for notifying the radio base station of the specified terminal category
The wireless terminal device according to claim 13, comprising: In a radio base station apparatus of a radio communication system including a radio base station apparatus and a radio terminal apparatus,
Bandwidth varying means for varying at least one of the transmission frequency bandwidth and the reception frequency bandwidth;
Category information receiving means for receiving terminal category information indicating a terminal category specified based on terminal performance information related to a transmission frequency bandwidth or a reception frequency bandwidth of the wireless terminal device transmitted from the wireless terminal device;
Line setting means for performing line setting with the wireless terminal device based on the category information and causing the wireless terminal device to transmit a control signal corresponding to the line setting;
A radio base station apparatus comprising: In a radio base station apparatus of a radio communication system including a radio base station apparatus and a radio terminal apparatus,
Bandwidth varying means for varying at least one of the transmission frequency bandwidth and the reception frequency bandwidth;
Category information receiving means for receiving terminal category information indicating a terminal category specified based on terminal performance information related to a transmission frequency bandwidth or a reception frequency bandwidth of the wireless terminal device transmitted from the wireless terminal device;
Scheduling means for performing scheduling for selecting a wireless terminal device to be communicated from the wireless terminal device based on the terminal category information;
A radio base station apparatus comprising:

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