JP5307095B2 - Wireless communication system and wireless communication method - Google Patents

Description

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

  Conventionally, in multicarrier type wireless communication using a plurality of subcarriers, a mobile station asks a base station for permission to transmit data using a contention channel prior to data transmission, and after obtaining permission Capture subcarriers. In the contention channel, in order to avoid collision between contention data transmitted from a plurality of mobile stations, the time slot to be used is divided for each mobile station, or contention data is divided into a preamble part and a message part. There is considered a scheme (W-CDMA scheme) in which a mobile station receives ACK / NACK as a response to the divided preamble section and confirms that radio resources are free and transmits a message section. Such a system is disclosed in Non-Patent Document 1, for example.

  Patent Document 1 discloses a method of dividing a data message for each OFDM tone and further dividing a time slot for reception in order to avoid collision between contention data transmitted from a plurality of mobile stations. ing.

Japanese Patent Laid-Open No. 2001-211189

Supervised by Keiji Tachikawa, “W-CDMA mobile communication system”, Maruzen Co., Ltd., June 2001, p. 130-134

  An object of the present invention is to provide a wireless communication system and a wireless communication method capable of reducing the amount of information related to a combination of assigned radio resources to be transmitted.

A radio communication system according to the present invention is a radio communication system capable of performing a plurality of radio communications using a subcarrier sequence in which a plurality of subcarriers are arranged in a frequency domain, and among the subcarrier sequences, A resource subcarrier sequence in which resource subcarriers used as radio resources for one radio communication are arranged in a frequency domain is converted into a common single arithmetic expression regardless of a predetermined parameter group and the number of the resource subcarriers. Specify based on.

The radio communication method according to the present invention is a radio communication method capable of performing a plurality of radio communications using a subcarrier sequence in which a plurality of subcarriers are arranged in the frequency domain, Among them, a resource subcarrier sequence in which resource subcarriers used as radio resources for one radio communication are arranged in the frequency domain is defined as a single predetermined common calculation regardless of a predetermined parameter group and the number of the resource subcarriers. Specify based on an expression.

  ADVANTAGE OF THE INVENTION According to this invention, the information content regarding the combination of the radio | wireless resource to allocate which should be transmitted can be reduced.

3 is a diagram showing frequency bands in the radio communication system according to Embodiment 1. FIG. 6 is a diagram showing priorities in the radio communication system according to Embodiment 1. FIG. 3 is a diagram showing frequency bands in the radio communication system according to Embodiment 1. FIG. 3 is a block diagram illustrating functions of a base station in the wireless communication system according to Embodiment 1. FIG. 3 is a block diagram illustrating functions of a mobile station in the wireless communication system according to Embodiment 1. FIG. 3 is a block diagram illustrating functions of a demodulation unit in the wireless communication system according to Embodiment 1. FIG. 3 is a diagram showing subcarrier priorities in the radio communication system according to Embodiment 1. FIG. 3 is a diagram showing subcarrier priorities in the radio communication system according to Embodiment 1. FIG. 3 is a diagram showing subcarrier priorities in the radio communication system according to Embodiment 1. FIG. 3 is a block diagram illustrating functions of a base station in the wireless communication system according to Embodiment 1. FIG. 6 is a diagram showing subcarrier allocation in a radio communication system according to Embodiment 2. FIG. 6 is a diagram showing subcarrier allocation in a radio communication system according to Embodiment 2. FIG. 6 is a diagram showing subcarrier allocation in a radio communication system according to Embodiment 2. FIG. 6 is a block diagram illustrating functions of a base station in a wireless communication system according to a second embodiment. FIG. 6 is a flowchart showing an operation of a base station according to the second embodiment. 6 is a block diagram illustrating functions of a base station in a wireless communication system according to Embodiment 3. FIG. FIG. 10 is a block diagram showing channel arrangement in a wireless communication system according to a third embodiment. FIG. 10 is a diagram illustrating a first aspect of subcarrier designation in a wireless communication system according to a third embodiment. FIG. 10 is a diagram showing a second mode of subcarrier designation in the wireless communication system according to the third embodiment. FIG. 10 is a diagram illustrating a third aspect of subcarrier designation in the wireless communication system according to the third embodiment. FIG. 10 is a diagram illustrating designation of subcarriers in a wireless communication system according to a fourth embodiment. 6 is a block diagram illustrating functions of a base station in a wireless communication system according to a fourth embodiment. FIG. 6 is a block diagram illustrating functions of a base station in a wireless communication system according to a fourth embodiment. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a case will be described as an example where subcarriers in FDM (including OFDM) are mainly used as radio resources for each of a plurality of mobile stations to perform one-to-one radio communication with a base station. The resource is not limited to a subcarrier in FDM, and may be a time slot in TDM or a code in CDMA, for example.

(Embodiment 1)
1 and 2 are schematic diagrams illustrating an operation (a wireless communication method) of the wireless communication system according to the first embodiment. FIG. 1 shows a case where the subcarriers f1 to f8 are frequency bands in the FDM system. The subcarriers f1 to f8 are allocated by a single base station to a plurality of mobile stations subordinate to the base station. In this specification, each subcarrier fn (n: integer) has a unique subcarrier number n, and the subcarrier numbers are assigned in ascending order from low frequency to high frequency in the frequency domain. And

  FIG. 2 shows priorities for assigning subcarriers f1 to f8 to each of user groups A and B when a plurality of mobile stations are classified into two types of user groups A and B. The classification into the user groups A and B is performed based on information such as a user ID and a telephone number unique to the mobile station. The priority shown in FIG. 2 is higher as the number is smaller. In FIG. 2, the allocation priority to the user group A is lower in the order of subcarriers f1 to f8 (that is, as the frequency becomes higher), and the allocation priority to the user group B is higher in the order of the subcarriers f1 to f8. It has become. In this way, by assigning the subcarriers f1 to f8 so that the priorities of the user groups A and B are different, the contention channel collision rate that occurs when contention data is transmitted from each mobile station can be reduced. It becomes possible.

  For example, when three radio resources (subcarriers) are used for transmission of one contention data (in other words, one contention channel occupies three radio resources), the user group A Even if one mobile station belonging to the group 1 and one mobile station belonging to the user group B try to communicate with one base station, the mobile station belonging to the user group A uses the subcarriers f1 to f3. However, since the mobile stations belonging to user group B use subcarriers f6 to f8, contention channel collision does not occur. In this way, by changing the subcarrier allocation priority between the mobile station belonging to one user group and the mobile station belonging to the other user group, contention data is retransmitted in order to prevent contention channel collisions. Can be eliminated. In FIG. 2, if the number of radio resources occupied by one contention channel is 8/2 = 4 or less, no collision occurs.

  In the above description, the case where the subcarriers f1 to f8 are determined by the FDM system as shown in FIG. 1 is described. However, the subcarriers f1 to f8 are not limited to this and are determined by the OFDM system as shown in FIG. Also good. In the OFDM scheme, adjacent subcarriers may be overlapped because they are orthogonal to each other. How to determine the frequency band of each of the subcarriers f1 to f8 is notified from the base station to the mobile station using a broadcast channel or the like. That is, the mobile station determines which frequency band to use to transmit contention data based on the broadcast channel and allocation priority notified from the base station.

  FIG. 4 is a block diagram showing functions of base station 100 in the radio communication system according to the present embodiment. FIG. 5 is a block diagram showing functions of mobile station 200 in the radio communication system according to the present embodiment.

  As shown in FIG. 4, the base station 100 includes a user distribution unit 10, an assignment priority instruction unit 20, a control information generation unit 30, a modulation unit 40, an RF unit 50, an antenna 60, and a demodulation unit. 70 and a wired I / F 80. As shown in FIG. 5, the mobile station 200 includes an antenna 110, an RF unit 120, a demodulation unit 130, a message analysis unit 140, an application unit 150, a data amount determination unit 160, and a radio resource allocation unit 170. And a modulation unit 180.

  In the base station 100 shown in FIG. 4, the user distribution unit 10 classifies each user (that is, each mobile station 200). The allocation priority instruction unit 20 determines the priority with which each radio resource is allocated to the user groups A and B classified by the user distribution unit 10 and sends the priority information to the control information generation unit 30. Notice. The control information generation unit 30 generates the priority information notified from the allocation priority instruction unit 20 as control information in a wireless format, and inputs the control information to the modulation unit 40. The modulation unit 40 performs predetermined modulation processing (DA conversion or the like) on the control information input from the control information generation unit 30 and inputs the control information to the RF unit 50. The RF unit 50 up-converts the control information input from the modulation unit 40 to a radio frequency with a built-in up-conversion unit (not shown in FIG. 4), and then transmits the control information from the antenna 60 to the mobile station 200.

  In the mobile station 200 shown in FIG. 5, the application unit 150 generates application data to be transmitted to the base station 100, such as mail, voice, and image. The data amount determining unit 160 determines the data amount of contention data to be transmitted to the base station 100 through the contention channel according to the data amount of the application data generated by the application unit 150, and uses the contention data as a radio resource. Input to the assigning unit 170. In general, more power is required to transmit a large amount of data. Therefore, mobile station 200 sets an upper limit on the amount of data to be transmitted in consideration of the amount of power that can be used. It is preferable.

  The RF unit 120 receives the control information transmitted from the base station 100 from the antenna 110, down-converts it into an analog baseband signal, and then inputs the control information to the demodulation unit 130. The demodulator 130 performs predetermined demodulation processing (AD conversion or the like) on the control information input from the RF unit 120 and inputs the control information to the message analyzer 140. The message analysis unit 140 extracts priority information by analyzing the control information input from the demodulation unit 130 and causes the radio resource allocation unit 170 to input the priority information. Based on the priority information input from the message analysis unit 140, the radio resource allocation unit 170 allocates contention data input from the data amount determination unit 160 to a predetermined radio resource as a contention channel, and modulates the unit 180. To input. The modulation unit 180 performs predetermined modulation processing (DA conversion or the like) on the contention data input from the radio resource allocation unit 170 and causes the content data to be input to the RF unit 120. The RF unit 120 transmits the contention data input from the modulation unit 180 to the base station 100 from the antenna 110 after up-converting the contention data to a radio frequency.

  In the base station 100 shown in FIG. 4, the RF unit 50 receives contention data transmitted from the mobile station 200 from the antenna 60, and converts it into an analog baseband signal by a built-in down-conversion unit (not shown in FIG. 4). After down-conversion, the data is input to the demodulator 70. The demodulating unit 70 performs predetermined demodulation processing (AD conversion or the like) on the contention data input from the RF unit 50 and causes the wired I / F 80 to input the contention data to a host device that controls the base station 100.

  FIG. 6 is a block diagram showing the function of the demodulator 70 when subcarriers in the OFDM scheme are used as radio resources. As shown in FIG. 6, the serial data input to the serial / parallel converter 71 is converted into parallel data and input to an FFT (Fast Fourier Transform) unit 72. The FFT unit 72 performs a predetermined demodulation process by performing FFT on the parallel data input from the serial / parallel conversion unit 71 and outputs a plurality of radio resources R (1) to R (N). The predetermined demodulation process is not limited to FFT, but may be DFT (Discrete Fourier Transform).

  By configuring in this way, the control can be simplified as compared with the W-CDMA system or the like disclosed in Non-Patent Document 1, so that the apparatus configuration can be simplified. That is, the mobile station 200 can omit the exchange of dividing the contention channel into the preamble part and the message part and transmitting the message part for the first time after receiving the ACK for the preamble part from the base station 100. In other words, in the contention channel, it is possible to omit the preamble portion and configure only the message portion. In the W-CDMA system, the contention channel is divided into RACH (preamble) and RACH (message), and the mobile station 200 confirms that the radio resources of the base station 100 are available by using the RACH (preamble). Then, RACH (message) is transmitted.

  Further, by reducing the collision rate of the contention channel, timing and data restrictions when transmitting contention data from the mobile station 100 are reduced. That is, since various sizes of data can be transmitted through the contention channel, the delay can be reduced. In general, contention data has a fixed length, but can be variable length, so that radio resources can be used effectively.

  In the above description, a case where a plurality of mobile stations are classified into two types of user groups A and B has been described. However, the present embodiment is not limited to two types, and is classified into an arbitrary type of user group. Is applicable. Below, the allocation priority of subcarriers 1 to 8 when a plurality of mobile stations 200 are classified into four types of user groups A to D will be described with reference to FIG.

  First, the number of subcarriers that can be used for transmission of one contention data (in other words, one contention channel can occupy) is calculated. This number is calculated as a quotient of (number of subcarriers / number of user groups), and in FIG. 7, 8/4 = 2.

  Next, to each of the user groups A to D, two subcarriers (calculated as the above quotient) are assigned with the highest priority (priority is 1 to 2). That is, user group A in subcarriers 1 and 2, user group B in subcarriers 3 to 4, user group C in subcarriers 5 to 6, user group D in subcarriers 7 to 8, Top priority.

  Next, the priority of the user groups B to D is determined in the subcarriers 1 to 2 where the user group A has the highest priority. At this time, the priority (6 to 8) of the user groups B to D in the subcarrier 1 with a relatively high priority of the user group A is 1, and the subcarrier with the priority of the user group A of 2 is relatively low. 2 is set lower than the priorities (3 to 5) of the user groups B to D in FIG. With this setting, for example, one contention channel occupies one subcarrier (1) in the user group A, and one contention channel in the user group B includes five subcarriers (3 , 4, 6, 8, 2), contention channel collisions can be prevented.

  Similarly, the priority of user groups A and C to D is determined in subcarriers 3 to 4 where user group B has the highest priority, and user groups A to B and subcarriers 5 to 6 in which user group C has the highest priority. The priority of D is determined, and the priority of user groups A to C is determined in subcarriers 7 to 8 where user group D has the highest priority.

  The priorities of the user groups B to D are determined based on a predetermined rule so as to be equal as a whole. In FIG. 7, the subcarriers 1 and 2 are determined to have higher priority in the order of the user groups B, C, and D, and the subcarriers 3 to 4 have higher priority in the order of the user groups C, D, and A. In the subcarriers 5 to 6, the priority is set so that the priority is higher in the order of the user groups D, A, and B, and in subcarriers 7 to 8, the priority is higher in the order of the user groups A, B, and C. It is determined as follows.

  By assigning the user groups A to D so that the priorities of the user groups A to D are different from each other by the above algorithm, for example, four mobile stations 200 belonging to the user groups A to D occupy two subcarriers, respectively. Even when one piece of contention data to be transmitted is transmitted at the same time, it is possible to prevent collision of contention channels.

  In the above description, the case where the radio resource is a subcarrier, that is, the case of the FDM system (including the OFDM system) has been described with reference to FIG. 7, but the present embodiment is also applied to the TDMA system and the CDMA system. Is possible. That is, this embodiment can be applied by substituting the subcarrier numbers shown in FIG. 7 with time slot numbers in the TDMA scheme and code numbers in the CDMA scheme. Alternatively, as shown in FIG. 8, a plurality of schemes (FDM scheme and CDMA scheme in FIG. 8) may be combined.

  In the above description, with reference to FIG. 7, in an arbitrary user group, priorities 1 and 2 are assigned to subcarriers adjacent to each other in the frequency domain (for example, in user group A, subbands adjacent to each other in the frequency domain are assigned. However, the present invention is not limited to this. For example, as shown in FIG. 9, priorities 1 and 2 are not adjacent to each other in the frequency domain. (For example, in user group A, priorities 1 and 2 are assigned to subcarriers 1 and 5 that are not adjacent to each other in the frequency domain, respectively). In each user group, the subcarriers assigned priorities 1 to 2 are occupied when the user group transmits one contention data, but by assigning separate frequency bands that are not adjacent to each other, It is possible to reduce frequency fading by effectively using the multicarrier scheme.

  Also, in the above description, the content data to be transmitted by the data amount determination unit 160 to the base station 100 according to the data amount of the application data generated by the application unit 150 in the mobile station 200 using FIGS. The case of determining the data amount has been described. However, the present invention is not limited to this, and as will be described below, the amount of contention data to be transmitted from the mobile station 200 to the base station 100 is determined based on the contention channel available by the base station 100 measuring the contention channel. The situation may be confirmed and notified to the mobile station 200.

  FIG. 10 is a block diagram showing functions of base station 100a in the radio communication system according to the present embodiment. FIG. 10 shows a contention channel measurement unit 90 provided between the control information generation unit 30 and the demodulation unit 70 in FIG. The contention channel measurement unit 90 confirms the vacancy status by measuring the communication quality of the transmission path in the contention data input from the demodulation unit 70 and notifies the control information generation unit 30 of the vacancy information.

  The contention channel can be measured by the following method. In the case of the CDMA system, since the plurality of mobile stations 200 use the same frequency, the electric field strength (RSSI) may be measured, or the usage status of the code number may be measured. In the case of the TDMA system, the ratio of the number of time slots used as contention channels to the total number of time slots allocated as contention channels may be measured, or the availability of time slot numbers May be measured. In the case of a multicarrier system (FDM system or OFDM system), the ratio of the number of subcarriers used as contention channels to the total number of subcarriers allocated as contention channels may be measured. Alternatively, the availability of subcarrier numbers may be measured.

  The control information generation unit 30 generates empty information notified from the contention channel measurement unit 90 as control information in a wireless format, and inputs it to the modulation unit 40. Note that the quality of the control information can be improved by performing error correction coding or performing repeated transmission as necessary when transmitting to the mobile station 200. Also, this control information can be represented by the nearest discrete value, thereby reducing the amount of data to be transmitted.

  Further, in the case of the CDMA system, the demodulation processing in the mobile station 200 can be simplified by assigning the control information to a predetermined code that is commonly used in each mobile station 200 using the contention channel. . Also, by transmitting this control information as layer 1 (physical layer) data, the delay can be reduced. In the case of the TDMA system, a predetermined time slot is used instead of the predetermined code, and in the case of a multicarrier system (FDM system or OFDM system), the predetermined subcarrier is used instead of the predetermined code. By assigning information, the demodulation process in the mobile station 200 can be simplified and the delay can be reduced.

  In the mobile station 200 shown in FIG. 5, the message analysis unit 140 analyzes the control information to extract free information and input it to the radio resource allocation unit 170. The radio resource allocation unit 170 allocates the contention data input from the data amount determination unit 160 to a predetermined radio resource as a contention channel based on the vacancy information input from the message analysis unit 140.

  At this time, the radio resource allocating unit 170 refers to the vacant information and allocates the content data to be transmitted to the vacant radio resource while adjusting the data amount. As a result, the collision rate of the contention channel can be reduced.

  The adjustment of the data amount can be performed by the following method. When the field strength is notified in the CDMA system, the maximum data amount may be determined in consideration of the reception capability of the base station 100. In the case of the TDMA system, the maximum data amount may be determined in consideration of the ratio of the number of time slots used as contention channels to the total number of time slots allocated as contention channels. In the case of a multicarrier scheme (FDM scheme or OFDM scheme), the maximum data considering the ratio of the number of subcarriers used as a contention channel to the total number of subcarriers allocated as a contention channel The amount can be determined. If allocation to radio resources is difficult even after adjusting the above data amount, it is possible to further reduce the contention channel collision rate by canceling transmission.

  Thus, in the radio communication system and radio communication method according to the present embodiment, a plurality of subcarriers are allocated to a plurality of user groups so that the priorities are different from each other. Therefore, the collision rate of the contention channel can be reduced. This eliminates the need to divide contention data into a preamble part and a message part or to receive in a base station standard time slot as compared with the W-CDMA system. can do.

  In general, when various media data are transmitted and received between a single base station and a plurality of mobile stations as wireless packets, the amount of data varies with time, such as packet data for web browsing, There are cases where a plurality of types of packets having different data sizes are handled. When performing such wireless communication, if a certain amount of wireless resources are allocated to each mobile station, the frequency is unnecessarily occupied, so it is preferable to use a contention channel to avoid this. In the W-CDMA system, the mobile station always transmits a signal composed of a preamble part using the DPCCH for demodulation and optimization of transmission power. According to the present embodiment, Since signal transmission can be made unnecessary, power used in the mobile station can be reduced.

  In the above description, the case where the multicarrier method (FDM method or OFDM method), the CDMA method, or the TDMA method is used alone has been described. However, the present invention is not limited to this, and these may be used together. What is necessary is just to use together the above methods.

  Moreover, the setting of the priority of the radio resource allocated to the user group as described above is applicable not only when the base station 100 uses the multicarrier scheme but also when the mobile station 200 uses the multicarrier scheme ( The same applies to the second and subsequent embodiments).

  In the above description, the case where the priority of the radio resource is allocated in the contention channel has been described. However, the present invention is not limited to the contention channel and may be applied to other channels (the same applies to the second and subsequent embodiments). .

(Embodiment 2)
In general, subcarriers in a multicarrier scheme (FDM scheme or OFDM scheme) have frequency-dependent transmission path characteristics. Therefore, such transmission path characteristics may be taken into account when subcarriers are allocated as radio resources.

  FIG. 11 is a diagram illustrating subcarrier allocation in the wireless communication system according to the second embodiment. In FIG. 11, bands 310 and 330 have high communication quality (reception sensitivity), and band 320 has low communication quality. At this time, it is possible to improve communication quality by preferentially using the bands 310 and 330 as radio resources (assigning the subcarrier sequences 340 and 350, respectively) compared to the band 320. In the present specification, a plurality of subcarriers arranged at equal intervals in the frequency domain is referred to as (simply) a subcarrier string.

  For example, in the base station 100, the above transmission path characteristics can be estimated by measuring communication quality using an average value of all contention channels received from the mobile station 200 for each band of a predetermined width. Alternatively, for example, in the case of a synchronous detection (quasi-synchronous detection) system, the above-described transmission path characteristics correspond to a known sequence signal (for example, a pilot signal in the W-CDMA system) included in the contention data in the base station 100. ) And the measured known series signal can be estimated by obtaining the phase difference in the carrier wave recovery circuit. This transmission path characteristic is notified from the base station 100 to the mobile station 200. Hereinafter, subcarrier allocation according to the present embodiment will be described with reference to FIGS.

  In the base station 100a shown in FIG. 10, the contention channel measuring unit 90 measures the quality of the contention data input from the demodulating unit 70 by measuring the electric field strength as described above. In this measurement result, the quality of each band can be measured by obtaining an average value for each band of a predetermined width. The measured quality of each band is notified to the control information generation unit 30 as quality information.

  The control information generation unit 30 notifies the allocation priority instruction unit 20 of the quality information notified from the contention channel measurement unit 90. Based on the quality information notified from the control information generating unit 30, the allocation priority instructing unit 20 determines what priority each radio resource has for each user group only in the bands 310 and 330 with high communication quality. It is determined whether or not to be assigned at a time and notified to the control information generating unit 30 as priority information.

  In mobile station 200 shown in FIG. 5, radio resource allocation section 170, based on the priority information input from message analysis section 140, performs contention input from data amount determination section 160, as in the first embodiment. Data is assigned to a predetermined radio resource as a contention channel and input to the modulation unit 180. The modulation unit 180 performs predetermined modulation processing (DA conversion or the like) on the contention data input from the radio resource allocation unit 170 and causes the content data to be input to the RF unit 120. The RF unit 120 transmits the contention data input from the modulation unit 180 to the base station 100 from the antenna 110 after up-converting the contention data to a radio frequency.

  In the above description, the base station 100a has described the case where the priority is determined based on the communication quality of each band and is transmitted to the mobile station 200 as the priority information. However, the present invention is not limited to this. For example, the base station 100a Only the quality information that is the measured communication quality of each band may be transmitted to the mobile station 200. In this case, the mobile station 200 may transmit contention data using only the bands 310 and 330 based on the received quality information.

  FIG. 12 is a diagram showing subcarrier allocation in the radio communication system according to the present embodiment. FIG. 12 shows a case where nine subcarriers 1 to 9 are assigned to three types of user groups A to C. The subcarriers 1 to 3 belong to the band 310 with high communication quality, the subcarriers 4 to 6 belong to the band 320 with low communication quality, and the subcarriers 7 to 9 belong to the band 330 with high communication quality. At this time, as shown in FIG. 12, the subcarriers 1 to 3 and 7 to 9 are set with a relatively high priority level of 1 to 6, and the subcarriers 4 to 6 are set with a relatively high priority level of 7 to 9. Set to low. Then, in each of the bands with high communication quality (subcarriers 310 and 330) and the band with low communication quality (subcarrier 320), according to FIG. Based on the prescribed rules.

  By assigning the user groups A to C so that the priorities of the user groups A to C are different from each other by the above algorithm, for example, three mobile stations 200 belonging to the user groups A to C simultaneously transmit contention data. In some cases, when two or less subcarriers are used to transmit one contention data (in other words, one contention channel occupies two or less subcarriers), contention channel collisions occur. Can be prevented. In this case, when user A uses three subcarriers, user B uses two subcarriers, and user C uses one subcarrier to transmit one contention data. Contention channel collisions do not occur. In this case, when user A uses three subcarriers, user B uses two subcarriers, and user C uses two subcarriers for transmission of one contention data, In the subcarrier 9, a collision between the contention channel of user A and the contention channel of user C occurs.

  FIG. 13 is a diagram showing subcarrier allocation in FIG. 12 when the communication quality differs depending on not only the frequency but also the user group. In FIG. 13, the user groups A and C have high communication quality in the subcarriers 1 to 3 (that is, the band 310), and the user group B has low communication quality, and the user group B in the subcarriers 4 to 6 (that is, the band 320). Has high communication quality, the user groups A and C have low communication quality, and the user groups A to C have high communication quality in the subcarriers 7 to 9 (that is, the band 330). At this time, as shown in FIG. 13, the subcarriers 4 to 6 set the priority of the user B group as relatively high as 1 to 3 and set the priority of the users A and C as relatively low as 7 to 9. In addition, the subcarriers 1 to 3 set the priority of the user group B to 7 to 9 and relatively low. Then, in each of the bands 310 and 330 having high communication quality for the users A and C and the band 320 having low communication quality for the users A and C, the priorities of the user groups A to C are set according to FIG. It is determined based on a predetermined rule to be equal.

  By assigning the user groups A to C so that the priorities of the user groups A to C are different from each other by the above algorithm, for example, three mobile stations 200 belonging to the user groups A to C simultaneously transmit contention data. In some cases, contention channel collisions occur when 3 or less subcarriers are used to transmit one contention data (in other words, one contention channel occupies 3 or less radio resources). Can be prevented.

  In the above description, the case where the quality of each band is measured by obtaining an average value for each band of a predetermined width has been described with reference to FIG. However, the present invention is not limited to this. For example, the communication quality may be measured for each subcarrier.

  FIG. 14 is a block diagram illustrating functions of the base station 100b when subcarriers in OFDM are used as radio resources. FIG. 14 is a diagram in which a transmission path estimation unit 91 and a radio resource allocation unit 92 are interposed between the demodulation unit 70 and the modulation unit 40 in FIG. 10 (some are omitted for convenience of illustration). )

  In FIG. 14, the RF unit 50 controls the control information input from the modulation unit 40 and the down-conversion unit 51 for inputting the contention data received from the antenna 60 to the demodulation unit 70 after down-converting the content data into an analog baseband signal. And an up-conversion unit 52 for transmitting from the antenna 60 after up-conversion to a radio frequency.

  Further, the demodulator 70 converts analog data output from the RF unit 50 into digital data (serial data) (not shown), and converts serial data output from the AD converter into parallel data and outputs the parallel data. In order to perform a predetermined demodulation process by performing FFT on the serial / parallel conversion unit 71 and parallel data output from the serial / parallel conversion unit 71 and to output a plurality of radio resources R (1) to R (N). FFT section 72. Also, the modulation unit 40 performs predetermined modulation processing by performing IFFT (Fast Inverse Fourier Transform) on the plurality of radio resources R (1) to R (N) output from the radio resource allocation unit 92, and performs parallel data. IFFT unit 42 for output as serial data, serial / parallel conversion unit 41 that converts parallel data output from IFFT unit 42 into serial data and outputs it, and serial data (digital data) output from serial / parallel conversion unit 41 ) Is converted to analog data. The predetermined modulation processing is not limited to IFFT, but may be IDFT (Discrete Inverse Fourier Transform). Further, the predetermined demodulation process is not limited to FFT but may be DFT.

  The FFT unit 72 performs OFDM demodulation processing by performing FFT on the parallel data input from the serial / parallel conversion unit 71 and outputs the result as a plurality of radio resources R (1) to R (N). The radio resources R (1) to R (N) output from the FFT unit 72 are input to the transmission path estimation unit 91. The transmission path estimation unit 91 estimates the transmission path characteristics of each subcarrier from each of the input radio resources R (1) to R (N) and notifies the radio resource allocation unit 92 of the transmission path characteristics. As described above, the transmission path characteristics are estimated by obtaining a phase difference using a known sequence signal. The radio resource allocation unit 92 allocates radio resources as shown in, for example, FIGS. 12 to 13 based on the transmission path characteristics of each subcarrier notified from the transmission path estimation unit 91.

  FIG. 15 is a flowchart showing the operation of the base station 100b shown in FIG.

  In step S1, the priority of subcarriers is considered without taking into consideration both the transmission path characteristics that differ depending on the frequency as described in FIG. 12 and the transmission path characteristics that differ depending on the user group as described in FIG. To decide. Thereby, the priority of the subcarrier is determined as shown in FIG. 7, for example. Then, the process proceeds to step S2.

  In step S2, when contention data is transmitted with the priority determined in step S1, it is determined whether or not a plurality of contention data collide in the same subcarrier. If a collision occurs, the priority determined in step S1 needs to be corrected, so the process proceeds to step S3. If a collision does not occur, the priority determined in step S1 does not need to be corrected. finish.

  In step S3, except for the subcarriers in which no collision occurred in step S2, the transmission path characteristics that differ depending on the frequency as described in FIG. 12 are taken into consideration, and differ depending on the user group as described in FIG. The subcarrier priority is determined without considering the transmission path characteristics. That is, the radio resource allocating unit 92 divides a band including all subcarriers into three bands 310 to 330, and the band 310 to 330 having a high communication quality is set to a relatively high priority and the band 320 having a low communication quality. Sets the priority relatively low. Then, when the data to be transmitted is serial data, the radio resource allocation unit 92 converts the data into parallel data (in parallel when the data to be transmitted is parallel data), and inputs the parallel data to the IFFT unit 42 Let Thereby, the priority of the subcarrier is determined as shown in FIG. Then, the process proceeds to step S4.

  In step S4, it is determined whether or not a plurality of contention data collide in the same subcarrier when contention data is transmitted with the priority determined in step S3. If a collision occurs, the priority determined in step S3 needs to be corrected, so the process proceeds to step S5. If a collision does not occur, the priority determined in step S3 does not need to be corrected. finish.

  In step S5, except for the subcarriers in which no collision occurred in step S4, the transmission path characteristics that differ depending on the frequency as described in FIG. 12 and the transmission path characteristics that differ depending on the user group as described in FIG. In consideration of both, the priority of the subcarrier is determined. That is, the communication quality is measured for each subcarrier so that, for example, a group of users assigned priority 1 in a certain band fails to demodulate contention data even though contention channel collision does not occur. In such a case, the user group is changed so as to be assigned priority 1 with subcarriers in other bands. Each of the user groups A to C also uses contention data to measure transmission path characteristics that differ depending on the user group, even for the band 320 that is determined to have low communication quality in step S3 (that is, in FIG. 12). Send a part of. For example, each of the user groups A, B, and C transmits contention data on subcarriers f4, f5, and f6 having the highest priority of the own user group in the band 320, respectively. By repeating this, the subcarrier priority is changed as shown in FIG. In addition, even when contention channel collision occurs, the priority as shown in FIG. 12 is obtained by estimating the transmission path of subcarriers that have not collided and measuring the communication quality for each band and each user group. The degree can be changed to the priority as shown in FIG. Then, the process proceeds to step S4.

  By assigning with the algorithm as described above, it is possible to assign an appropriate priority to subcarriers in consideration of different channel characteristics depending on the frequency and user group.

  As described above, in the radio communication system and radio communication method according to the present embodiment, contention channel collisions can be easily performed because allocation is made to appropriate subcarriers considering different transmission path characteristics depending on the frequency and user group. Can be reduced.

(Embodiment 3)
A subcarrier used as a radio resource may be designated by a subcarrier number itself allocated in ascending order from a low frequency to a high frequency to a plurality of subcarriers (subcarrier trains) arranged at equal intervals in the frequency domain. Alternatively, it may be specified by subcarrier allocation information including predetermined parameters and the like.

  FIG. 16 is a block diagram showing functions of base station 100c in the wireless communication system according to the third embodiment. FIG. 16 is provided with a subcarrier allocation information storage unit 93 for inputting the subcarrier allocation information to the modulation unit 40 in FIG. 4 (partially omitted for convenience of illustration). The subcarrier allocation information storage unit 93 stores subcarrier allocation information including predetermined parameters for designating subcarriers used as radio resources. The subcarrier allocation information input from the subcarrier allocation information storage unit 93 is subjected to a predetermined modulation process in the modulation unit 40 and input to the RF unit 50. The RF unit 50 up-converts the subcarrier allocation information input from the modulation unit 40 to a radio frequency using a built-in up-conversion unit (not shown in FIG. 16), and then transmits the subcarrier allocation information from the antenna 60 to the mobile station 200.

  In mobile station 200 shown in FIG. 5, RF section 120 receives subcarrier allocation information transmitted from base station 100 c from antenna 110, down-converts it to an analog baseband signal, and then inputs it to demodulation section 130. Demodulation section 130 performs predetermined demodulation processing (AD conversion or the like) on the subcarrier allocation information input from RF section 120 and causes message analysis section 140 to input the information. The message analysis unit 140 analyzes the subcarrier allocation information input from the demodulation unit 130 to extract predetermined parameters and the like included in the subcarrier allocation information. Then, based on the predetermined parameter or the like, a subcarrier number itself used as a radio resource is calculated and input to the radio resource allocation unit 170. As shown in FIG. 17, the subcarrier allocation information may use a control channel associated with the data channel. That is, I-ch is used as a data channel for accommodating broadcast information (received from base station 100 when mobile station 200 is in a waiting state), synchronization information, and the like, and Q-ch is used as a subcarrier. It is used as a control channel that stores allocation information and the like. This is similar to using I-ch as DPDCH and Q-ch as DPCCH when using I-ch as a data channel in the W-CDMA system. Or not only this but subcarrier allocation information may be accommodated in I-ch as said alerting | reporting information.

  FIG. 18 is a diagram illustrating a first aspect of designation of subcarriers in the wireless communication system according to the present embodiment.

  In FIG. 18, the subcarrier allocation information includes the top subcarrier number Sa = 1 (may be a frequency), the total number of subcarriers Sb = 8, and the interval Sc = 4 between adjacent subcarriers (difference depending on the subcarrier number). Or a bandwidth) and an arithmetic expression S = Sa + Sc × n (n = 0 to (Sb−1)). The message analysis unit 140 built in the mobile station 200 uses these parameters and arithmetic expressions to use the subcarrier number S = 1 + 4 × n (n = 0 to 7) = 1, 5, 9, 13, 17, 21. , 25, 29 are derived.

  That is, in FIG. 18, subcarriers f1 to f32 constitute a subcarrier train according to the present invention. Further, subcarriers f1, f5, f9, f13, f17, f21, f25, and f29 are resource subcarriers according to the present invention, and constitute a resource subcarrier sequence.

  When the above-mentioned interval Sc is described by a bandwidth, for example, the time distance between the subcarrier f1 and the subcarrier f2 in FIG. 18 is ½ of the symbol time Ts (that is, the time distance is Ts / 2), the interval Sc expressed by the bandwidth is (1 / (Ts / 2)) / 4 = 1 / (2Ts). Also, subcarrier numbers S = 2 + 4 × n (n = 0-7) = 2, 6, 10, 14, 18, 22, 26, 30 are derived by setting Sa = 2 under the above conditions. Is possible. Similarly, by setting Sa = 3 or Sa = 4, it is possible to derive other subcarrier numbers.

  In the radio resource designation according to the first aspect shown in FIG. 18, when subcarriers are allocated to four types of user groups, subcarriers corresponding to Sa = 1, 2, 3, 4 are allocated. Thus, collision of the contention channel can be prevented. When there are five or more types of user groups, contention channel collisions can be reduced by setting the priority of subcarrier allocation as in the first embodiment. That is, for example, S = 1, 5, 9, 13, 17, 21, 21, 25 and 29 shown in FIG. 18 may be replaced with S = 1 to 8 shown in FIG.

  Also, in specifying the radio resource according to the first aspect, the subcarrier to be used as the radio resource is specified by subcarrier allocation information including a predetermined parameter instead of the subcarrier number itself, so that the information amount can be reduced. For example, in FIG. 18, when subcarriers are designated by the subcarrier number itself, eight (S = 1, S = 5, S = 9, S = 13, S = 17, S = 21, S = 25, S = 29) information is required, but if specified by subcarrier allocation information, only three pieces of information (Sa = 1, Sb = 8, Sc = 4) are required. Therefore, the amount of data to be transmitted from the base station 100 to the mobile station 200 can be reduced.

  FIG. 19 is a diagram showing a second aspect of radio resource designation in the radio communication system according to the present embodiment.

In FIG. 19, the subcarrier allocation information includes the top subcarrier number Sa = 1 (may be a frequency), the total number of subcarriers Sb = 5, and the arithmetic expression S = n ² (n = Sa to Sa + (Sb−1). )). The message analysis unit 140 built in the mobile station 200 derives subcarrier numbers S = n ² (n = 1 to 5) = 1, 4, 9, 16, 25 using these parameters and arithmetic expressions. . In the second mode, operations similar to those in the first mode are performed except for the parameters and the arithmetic expression, and similar effects are obtained. Also in the second mode, as in the first embodiment, contention channel collisions can be reduced by setting the priority of subcarrier allocation.

  FIG. 20 is a diagram showing a third aspect of radio resource designation in the radio communication system according to the present embodiment. A third aspect is characterized in that, in the first aspect, the subcarriers are composed of a plurality of sets.

In FIG. 20, the subcarrier is composed of a first set consisting of S = 1, 5, 9, 13 and a second set consisting of S = 26, 28, 30, 32. Therefore, in the first set, the subcarrier allocation information includes the first subcarrier number Sa ₁ = 1, the total number of subcarriers Sb ₁ = 4, the interval Sc ₁ = 4 between adjacent subcarriers, S ₁ = Sa ₁ + Sc ₁ × n (n = 0 to (Sb ₁ −1)). In the second set, the first subcarrier number Sa ₂ = 26 and the total number of subcarriers Sb ₂ = 4, subcarrier spacing Sc ₂ = 2 between adjacent subcarriers, and arithmetic expression S ₂ = Sa ₂ + Sc ₂ × n (n = 0 to (Sb ₂ −1)). . In the third aspect, the same operation as in the first aspect is performed except that the subcarrier is composed of a plurality of sets, and the same effect is obtained. Also in the third mode, as in the first embodiment, contention channel collisions can be reduced by setting the priority of subcarrier allocation. That is, for example, S = 1, 5, 9, 13, 26, 28, 30, and 32 shown in FIG. 20 may be replaced with S = 1 to 8 shown in FIG.

  That is, in FIG. 20, subcarriers f1 to f32 constitute a subcarrier train according to the present invention. Further, subcarriers f1, f5, f9, f13, f26, f28, f30, and f32 are resource subcarriers according to the present invention, and constitute a resource subcarrier sequence. In addition, subcarriers f1, f5, f9, and f13 and subcarriers f26, f28, f30, and f32 each constitute a first resource subcarrier sequence according to the present invention.

  In the above description, the case where the number of sets is 2 and the first set and the second set are separated has been described. However, the number of sets is not limited to 2, and may be 3 or more. May overlap. As a result, more various subcarrier sequences can be designated by the arithmetic expression.

  In addition, if the frequency band required for the resource subcarrier train (the difference between the highest frequency and the lowest frequency of all resource subcarriers contained in the resource subcarrier train) becomes wide, the frequency of occurrence of multipath fading increases. Even in such a case, it is possible to reduce the influence of multipath fading by narrowing the frequency band per set by increasing the number of sets and decreasing the number of subcarriers per set.

  In addition, if the frequency of the subcarrier train (the average frequency of all resource subcarriers included in the resource subcarrier train) increases, the frequency at which multipath fading occurs increases at the same moving speed. However, by increasing the number of sets and reducing the number of subcarriers per set, it is possible to narrow the frequency band per set and reduce the influence of multipath fading.

  Moreover, even if the subcarrier sequence is recognized as being arranged irregularly when specified by the subcarrier number itself, these are divided into a plurality of sets according to a predetermined rule (calculation formula). Recognizing regularly for each group, it becomes possible to perform FFT and IFFT collectively. Thereby, processing can be facilitated.

  In the above description, the case where all subcarriers are designated by an arithmetic expression (that is, by subcarrier allocation information) has been described. However, only a part of the subcarrier sequence is designated by subcarrier allocation information, and the rest are subcarrier numbers. It may be specified by itself.

  As described above, in the radio communication system and radio communication method according to the present embodiment, a subcarrier to be used as a radio resource is designated not by the subcarrier number itself but by subcarrier allocation information including predetermined parameters. Therefore, it is possible to reduce the amount of information related to the combination of radio resources to be allocated to be transmitted. Therefore, the amount of data to be transmitted from the base station 100 to the mobile station 200 can be reduced.

  In the above description, the case where the subcarrier number is notified from the base station 100 to the mobile station 200 has been described. However, the present invention is not limited to this case. Forms may be applied.

  In addition, the arithmetic expression used in the present embodiment is not limited to that described above, and may be any expression that can express the subcarrier number of the subcarrier sequence used as a radio resource.

(Embodiment 4)
The subcarriers to be used as radio resources may all have the same bandwidth, or may have partially different bandwidths.

  FIG. 21 is a diagram illustrating designation of subcarriers in the wireless communication system according to the fourth embodiment.

  As shown in FIG. 21, the subcarriers f1 to f26 include a first set of subcarriers f1 to f14 having a relatively narrow bandwidth and subcarriers f15 to f18 having a relatively wide bandwidth. The second set is divided into a third set including subcarriers f19 to f26 having a relatively narrow bandwidth. Within each set, each subcarrier has the same bandwidth. Further, the bandwidth of the subcarriers f1 to f14 and the bandwidth of the subcarriers f19 to f26 may be the same or different. In FIG. 21, subcarriers f1, f5, f9, and f13 of the first set of subcarriers f1 to f14 are used as radio resources, and all of the subcarriers f15 to f18 of the second set of subcarriers f15 to f18 are used. Used as a radio resource, subcarriers f20, f22, f24, and f26 of the third set of subcarriers f19 to f26 are used as radio resources.

  That is, in FIG. 21, for example, subcarriers f1, f5, f9, and f13 and subcarriers f20, f22, f24, and f26 constitute a second resource subcarrier sequence according to the present invention, and subcarriers f15 to f18 constitutes the third resource subcarrier sequence according to the present invention.

  FIG. 22 is a block diagram illustrating functions of the base station 100d in the wireless communication system according to the fourth embodiment. FIG. 22 shows a subcarrier division information storage unit 94 for inputting the subcarrier division information to the control information generation unit 30 in FIG. 4 and shows the function of the demodulation unit 70 in more detail (for convenience of illustration). , Some are omitted). In FIG. 22, the demodulator 70 includes an AD converter (not shown), one serial / parallel converter 71 connected to the AD converter, and three FFT units 72a connected to the serial / parallel converter 71. 72b, 72c. The subcarrier division information storage unit 94 stores subcarrier division information for dividing subcarriers used as radio resources into a plurality of sets. This subcarrier division information includes the bandwidth of each set of subcarriers, the top subcarrier number of each set, and the total number of subcarriers in each set. The control information generation unit 30 generates the subcarrier division information input from the subcarrier division information storage unit 94 as control information in a radio format, and inputs the control information to the modulation unit 40. The modulation unit 40 performs predetermined modulation processing on the control information input from the control information generation unit 30 and causes the control information to be input to the RF unit 50. The RF unit 50 up-converts the control information input from the modulation unit 40 to a radio frequency using a built-in up-conversion unit (not shown in FIG. 22), and then transmits the control information from the antenna 60 to the mobile station 200.

  In the mobile station 200 shown in FIG. 5, the RF unit 120 receives the control information transmitted from the base station 100 from the antenna 110, down-converts it into an analog baseband signal, and then inputs it to the demodulation unit 130. The demodulator 130 performs predetermined demodulation processing (AD conversion or the like) on the control information input from the RF unit 120 and inputs the control information to the message analyzer 140. The message analysis unit 140 extracts the subcarrier division information by analyzing the control information input from the demodulation unit 130, and uses the technique described in the third embodiment to wirelessly transmit the subcarriers f1 to f26. Second subcarrier division information including a subcarrier number used as a resource and each of the first to third sets of bandwidths is generated and input to radio resource allocation section 170. Radio resource allocation section 170 allocates contention data input from data amount determination section 160 to a predetermined subcarrier as a contention channel based on the second subcarrier division information input from message analysis section 140, Input to the modulation unit 180. The modulation unit 180 performs predetermined modulation processing (DA conversion or the like) on the contention data input from the radio resource allocation unit 170 and causes the content data to be input to the RF unit 120. The RF unit 120 transmits the contention data input from the modulation unit 180 to the base station 100 from the antenna 110 after up-converting the contention data to a radio frequency.

  In the base station 100d shown in FIG. 22, the RF unit 50 receives contention data transmitted from the mobile station 200 from the antenna 60, and converts it into an analog baseband signal by a built-in down-conversion unit (not shown in FIG. 22). After down-conversion, the data is input to the demodulator 70. The demodulator 70 performs predetermined demodulation processing (AD conversion or the like) on the contention data input from the RF unit 50 using an AD converter (not shown), converts the content data into digital data (serial data), and the serial / parallel converter 71. To input. The serial / parallel converter 71, based on the second subcarrier division information, sends contention data related to the first set of subcarriers f1, f5, f9, and f13 to the FFT unit 72a and the second of subcarriers f15 to f18. The content data related to the set is input to the FFT unit 72b, and the content data related to the third set including the subcarriers f20, f22, f24, and f26 is input to the FFT unit 72c.

  In general, when the bandwidth is wide, it is possible to reduce interference with other base stations by reducing the signal transmission rate and reducing the coding rate. Therefore, in the frequency band where the interference from other base stations is large, the bandwidth may be widened like the subcarriers f15 to f18.

  In addition, by not using the subcarrier f14 located at the boundary between the first set and the second set and the subcarrier f19 located at the boundary between the second set and the third set as radio resources, between sets having different frequencies Is provided with a center frequency difference. Thereby, it becomes possible to reduce interference between groups.

  In the above description, the subcarriers f15 to f18 having a wide bandwidth have been described with respect to the case where the signal transmission rate is reduced and the coding rate is reduced in order to reduce interference from other base stations. However, the spreading factor may be increased, or the modulation factor may be reduced.

  FIG. 23 is a block diagram illustrating functions of the demodulator 70a when subcarriers in OFDM are used as radio resources. FIG. 23 is obtained by connecting despreading units 73a to 73c to the FFT units 72a to 72c in the demodulating unit 70 shown in FIG. 22 (parts are omitted for convenience of illustration). Increasing the spreading factor is to lengthen the spreading code multiplied by the despreading units 73a to 73c, so that it corresponds to narrowband subcarriers f1, f5, f9, and f13 based on the second subcarrier division information. The despreading unit 73a shortens the spreading code, the despreading unit 73b corresponding to the wideband subcarriers f15 to f18 lengthens the spreading code, and the despreading unit corresponding to the narrowband subcarriers f20, f22, f24, and f26. 73c lengthens the spread code. The spreading factor in the despreading units 73a to 73c is notified from the base station 100 to the mobile station 200 using a broadcast channel or the like. After receiving the spreading factor and the subcarrier division information, the mobile station 200 transmits a contention channel to the base station 100 based on these information.

  In FIG. 23, as in FIG. 22, the serial / parallel converter 71 performs FFT on contention data related to the first set of subcarriers f1, f5, f9, and f13 based on the second subcarrier division information. Content data related to the second set of subcarriers f15 to f18 is input to the FFT unit 72b, and contention data related to the third set of subcarriers f20, f22, f24, and f26 is input to the FFT unit 72c. Let This avoids using the subcarrier f14 located at the boundary between the first set and the second set and the subcarrier f19 located at the boundary between the second set and the third set as radio resources, and reduces interference between the sets. It becomes possible to do. In addition, since the transmission speed of signals in a frequency band with large interference can be reduced, interference from other base stations can be made difficult to receive.

  Thus, according to the wireless communication system and the wireless communication method according to the present embodiment, the subcarrier sequence is divided into a plurality of sets according to the bandwidth. Therefore, in a frequency band where interference from other base stations is large, a plurality of bandwidths different from one base station 100 are used by expanding the bandwidth and reducing the coding rate or increasing the spreading factor. It is possible to communicate with the mobile station 200 while reducing interference. Therefore, it is possible to reduce the number of transmissions of the data amount of a preamble signal such as a Pilot signal transmitted for measuring a phase shift due to interference. Therefore, the electric power used can be reduced. Also, different OFDM schemes using subcarriers with different bandwidths can be combined.

  Also in the present embodiment, as in the first embodiment, contention channel collisions can be reduced by setting the priority of subcarrier allocation.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

  f1 to f26 subcarriers.

Claims (8)

A wireless communication system capable of performing a plurality of wireless communications using a subcarrier sequence in which a plurality of subcarriers are arranged in a frequency domain,
Among the subcarrier sequences, a resource subcarrier sequence in which resource subcarriers used as radio resources for one radio communication are arranged in the frequency domain is defined as a predetermined common parameter regardless of a predetermined parameter group and the number of the resource subcarriers. A wireless communication system to be specified based on a single arithmetic expression. The wireless communication system according to claim 1,
The predetermined parameter group includes an interval between the resource subcarriers adjacent to each other in the frequency domain,
The arithmetic expression is a wireless communication system represented by a linear expression of the interval. The wireless communication system according to claim 1,
The arithmetic expression is a wireless communication system represented by a secondary expression of subcarrier numbers assigned to the subcarrier sequence in ascending order from a low frequency to a high frequency. A wireless communication system according to any one of claims 1 to 3,
The resource subcarrier sequence is a radio communication system comprising a plurality of sets of first resource subcarrier sequences. The wireless communication system according to claim 4,
The number of sets of the plurality of sets of first resource subcarrier sequences is a radio communication system determined according to the frequency bandwidth of the resource subcarrier sequence. The wireless communication system according to claim 4,
The number of sets of the plurality of first resource subcarrier sequences is a radio communication system determined according to an average frequency of the resource subcarrier sequences. The wireless communication system according to claim 4,
The wireless communication system, wherein the plurality of sets of first resource subcarrier sequences include a second resource subcarrier sequence and a third resource subcarrier sequence each composed of subcarriers having different bandwidths. A wireless communication method capable of performing a plurality of wireless communications using a subcarrier sequence in which a plurality of subcarriers are arranged in a frequency domain,
Among the subcarrier sequences, a resource subcarrier sequence in which resource subcarriers used as radio resources for one radio communication are arranged in the frequency domain is defined as a predetermined common parameter regardless of a predetermined parameter group and the number of the resource subcarriers. Wireless communication method specified based on a single arithmetic expression.

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