BR112018006184B1 - COMMUNICATION APPARATUS, TRANSMISSION METHOD IMPLEMENTED BY A COMMUNICATION APPARATUS, TERMINAL STATION AND RECEPTION METHOD IMPLEMENTED BY A TERMINAL STATION - Google Patents

Abstract

COMMUNICATION DEVICE, TERMINAL AND COMMUNICATION METHOD. An RA ID table storage unit (101) stores a plurality of random access IDs used to instruct a terminal which transmission frequency resources to use for random access, where each of the random access IDs is uniquely associated with a communication state between a terminal that performs random access and a communication device. An RA control signal generating unit (104) generates a random access control signal including allocation information indicating at least one transmission frequency resource, where each of the at least one transmission frequency resource has one of the Random access IDs assigned to it. A wireless transceiver (106) transmits the random access control signal.

Description

Technical Field

[001] The present description refers to a communication device, a terminal and a communication method.

Previous Technique

[002] The ax task group of the IEEE 802.11 Working Group (Institute of Electrical and Electronics Engineers) has developed the IEEE 802.11ax technical specification (hereinafter referred to as "11ax"), which is a successor to 802.11ac. OFDMA (orthogonal frequency division multiple access) based random access (RA: Random Access) has many chances of being introduced in 11ax.

[003] An access point (also referred to as a "base station") transmits a random access control signal (hereinafter referred to as "TF (trigger frame)-R") to a plurality of terminals (also referred to as "STAs (Stations)") that the access point accommodates. TF-R includes RU information indicating a transmission frequency resource for random access (hereinafter referred to as a "resource unit (RU)"). A terminal that transmits a UL response signal (also referred to as an "UL uplink response frame") via random access selects one of the plurality of random access RUs indicated by the Random Access RU information (RA RUs). included in TF-R randomly and transmits a UL response signal by using the selected RU (referred, for example, to NPL 1).

[004] For 11ax, several random access applications are being studied. Two random access applications that were studied are described below.

[005] The first use of random access is to notify the access point of uplink transmission storage information (also referred to as "Buffer Status Information") (refer to, for example, NPL 2) .

[006] The access point allows a plurality of terminals to perform random access via TF-R. A terminal having uplink data (UL data) in the transmission buffer randomly selects an RU from among the RA RUs specified by TF-R. After that, the terminal transmits a UL response signal including the transmission storage information to the access point by using the selected RU. The access point can know the transmission temporary storage state through random access and thus can efficiently schedule the UL Data after random access.

[007] The second use of random access is to transmit an uplink signal over OFDMA even when a terminal operating in a power saving mode (also referred to as a "Power Saving (PS) terminal") returns from the power saving state. energy saving, and the access point does not know that the terminal holds the uplink data in transmission temporary storage. This use can avoid a reduction in transmission efficiency caused by a plurality of terminals performing uplink transmission separately as a single user (SU) (reference, for example, NPL 3).

Citation List Non-Patent Literature

[008] NPL 1: IEEE 802.11 - 15/0875r1 "Random Access with Trigger frames using OFDMA"

[009] NPL 2: IEEE 802.11 - 15/0843r1 "UL MU Random Access Analysis"

[0010] NPL 3: IEEE 802.11 - 15/1107r0 "Power Save with Random Access"

[0011] NPL 4: IEEE 802.11 - 15/1066r0 "HE-SIG-B Contents"

[0012] NPL 5: IEEE Std 802.11-2012

Summary of the Invention

[0013] However, as the amount of control signal information (the UL response signal) transmitted by a terminal increases due to the random access described above, the resource (e.g., the length of time) required for transmission of the UL response signal increases. Consequently, the resource used to transmit UL/DL Data decreases and, therefore, the system performance decreases. In contrast, if the amount of control signal information transmitted through random access decreases, efficient scheduling of UL/DL Data transmission after random access cannot be realized. As a result of this, system performance decreases.

[0014] An objective of an aspect of the present description is to provide a communication device, a terminal, and a communication method capable of increasing system throughput without an increase in the amount of information of a control signal transmitted through the access random.

Solution to the Problem

[0015] According to one aspect of the present description, a communication device includes a storage unit that stores a plurality of random access IDs used to instruct a terminal as to which transmission frequency resources to use for random access, where each one of the random access IDs is uniquely associated with the communication state between a terminal performing random access and the communication device, a generating unit that generates a random access control signal including allocation information indicating at least one transmission frequency resource, wherein each of the at least one transmission frequency resource has one of the random access IDs assigned to it, and a transmission unit that transmits the random access control signal.

[0016] According to one aspect of the present description, a terminal includes a storage unit that stores a plurality of random access IDs used to instruct a terminal which transmission frequency resources to use for random access, where each of the Random access IDs are uniquely associated with the communication state between a terminal performing random access and the communication device, a receiving unit that receives a random access control signal including allocation information indicating at least one transmission frequency resource, wherein each of the at least one transmission frequency resource has one of the random access IDs assigned to it, a selection unit that selects, from among the at least one transmission frequency resource, one of the transmission frequency resources, each having a random access ID that is the same as the random access ID associated with the terminal's communication state, and a transmission unit that transmits a random access signal by utilizing the transmission frequency resource. transmission selected.

[0017] It should be noted that general or specific embodiments can be implemented as a system, an apparatus, a method, an integrated circuit, a computer program, a recording medium, or any selective combination thereof.

[0018] According to an embodiment of the present description, the system performance can be increased without increasing the amount of information of a control signal transmitted by random access.

[0019] Additional benefits and advantages of the described embodiments will become apparent from the specification and drawings. Benefits and/or advantages can be obtained individually by various modalities and features of the specification and drawings, which need not all be provided in order to obtain one or more of said benefits and/or advantages.

Brief Description of the Drawings

[0020] Figure 1 is a flowchart illustrating the operations performed by an access point and a terminal according to a first embodiment;

[0021] Figure 2 is a block diagram illustrating the main configuration of the access point according to the first embodiment;

[0022] Figure 3 is a block diagram illustrating the main configuration of the terminal according to the first embodiment;

[0023] Figure 4 is a block diagram illustrating the access point configuration according to the first embodiment;

[0024] Figure 5 is a block diagram illustrating the terminal configuration according to the first embodiment;

[0025] Figure 6A illustrates an example of an RA ID table in accordance with Configuration Method 1 in accordance with the first embodiment;

[0026] Figure 6B illustrates an example of a TF-R according to Configuration Method 1 according to the first embodiment;

[0027] Figure 7 illustrates an example of a TF-R transmission format;

[0028] Figure 8 illustrates another example of the TF-R transmission format;

[0029] Figure 9 illustrates another example of TF-R, according to Configuration Method 1 of the first embodiment;

[0030] Figure 10A illustrates an example of an RA ID table in accordance with Configuration Method 2 of the first embodiment;

[0031] Figure 10B illustrates an example of a TF-R according to Configuration Method 2 of the first embodiment;

[0032] Figure 11A illustrates an example of an ID RA table in accordance with Configuration Method 3 of the first embodiment;

[0033] Figure 11B illustrates an example of a TF-R according to Configuration Method 3 of the first embodiment;

[0034] Figure 12 is a block diagram illustrating the configuration of a terminal according to a second embodiment;

[0035] Figure 13A illustrates an example of an RA ID table in accordance with Configuration Method 4 of the second embodiment;

[0036] Figure 13B illustrates an example of a TF-R according to Configuration Method 4 of the second embodiment;

[0037] Figure 13C illustrates another example of TF-R according to Configuration Method 4 of the second embodiment;

[0038] Figure 14 illustrates an example of an RU allocation pattern being discussed in the 11ax standardization;

[0039] Figure 15 illustrates an example of a TF-R according to Configuration Method 5 of the second embodiment;

[0040] Figure 16 illustrates an example of a TF-R according to Configuration Method 6 of the second embodiment;

[0041] Figure 17 is a block diagram illustrating the configuration of a terminal according to a third embodiment;

[0042] Figure 18A illustrates an example of an ID RA table in accordance with Configuration Method 7 of the third embodiment;

[0043] Figure 18B illustrates an example of a TF-R according to Configuration Method 7 of the third embodiment;

[0044] Figure 19 illustrates an example of an RA ID table according to another embodiment;

[0045] Figure 20 is a block diagram illustrating the configuration of a terminal according to a fourth embodiment;

[0046] Figure 21A illustrates an example of an RA ID table according to the fourth embodiment;

[0047] Figure 21B illustrates an example of a TF-R according to Configuration Method 8 of the fourth embodiment;

[0048] Figure 21C illustrates another example of TF-R according to Configuration Method 9 of the fourth embodiment;

[0049] Figure 22A illustrates an example of an RA ID table in accordance with Configuration Method 10 of the fourth embodiment;

[0050] Figure 22B illustrates an example of a TF-R in accordance with Configuration Method 10 of the fourth embodiment;

[0051] Figure 23 illustrates an example of an RA ID table according to another embodiment;

[0052] Figure 24 illustrates an example of TF and TF-R format according to a fifth modality;

[0053] Figure 25 illustrates an example of the structure of an information field per terminal when a RA ID table according to example 1 is used;

[0054] Figure 26 illustrates another example of the structure of the information field per terminal when a RA ID table according to example 1 is used;

[0055] Figure 27 illustrates an ID RA table according to example 1;

[0056] Figure 28 illustrates an example of the structure of a terminal-specific information field when a RA ID table according to example 2 is used;

[0057] Figure 29 illustrates an ID RA table according to example 2;

[0058] Figure 30 illustrates an example of the structure of a terminal-specific information field when a RA ID table according to example 3 is used;

[0059] Figure 31 illustrates the RA ID table according to example 3;

[0060] Figure 32 illustrates an example of the structure of a terminal-specific information field when a RA ID table according to example 4 is used;

[0061] Figure 33 illustrates the RA ID table according to example 4;

[0062] Figure 34 illustrates an example of the structure of a terminal-specific information field in Programmed access.

Description of Modalities

[0063] Embodiments of the present description are described in detail below with reference to the attached drawings. In embodiments, the same constituent elements are denoted by the same numerical references. Since the descriptions of the same constituent elements are the same, the description will not be repeated.

First Modality Communication System Overview

[0064] The communication system according to the present embodiment includes an access point 100 (a communication device) and a terminal 200. The access point 100 is an access point that supports 11ax, and the terminal 200 is an terminal that supports 11ax.

[0065] Figure 1 illustrates the processing flow of the communication system according to the present embodiment.

[0066] In Figure 1, access point 100 generates a random access (RA) control signal (TF-R) (step (hereinafter referred to as "ST") 101).

[0067] At this time, in a programmed UL Data control signal (TF: Drive Frame), a singular ID (STA_ID) for singular identification of one of the terminals 200 is used to clearly indicate the RU allocation. That is, each of the terminals 200 determines that an RU having a terminal ID 200 assigned to it is an available RU. In contrast, in the RA (TF-R) control signal, a random access (RA) ID is used to clearly indicate the allocation of the random access (RA) RU. According to the present embodiment, a plurality of RA IDs are defined.

[0068] As an RA ID, an ID that is not designed to uniquely identify a specific terminal 200 is used. More specifically, as a STA_ID, an Association ID (AID) which is a singular ID assigned at the time of association to a network (BSS: Basic Service Set, a plurality of terminals 200 under the control of the access point 100) to which access point 100 belongs to, how to be used. As an RA ID, a spare value (a reserved value) not normally used for AID can be used.

[0069] Additionally, according to the present embodiment, terminal information, such as communication status (e.g., reception quality, path loss, RSSI, terminal interference energy) is uniquely associated with the RA ID indicating the allocation of each of the RA RUs. That is, for the RUs, each having one of the RA IDs assigned to it, the terminals 200 that can use (access) the RU are limited according to the terminal information. For example, according to the standard, the correspondence relationship between a RA ID and terminal information may be predetermined in the form of a RA ID table prescribed in advance, and the RA ID table may be shared between the access point 100 and the terminal 200. Additionally, the RA ID table can be changed from the prescribed values by the following method. That is, the RA ID table (or a change to the RA ID table) may be notified to the terminal 200 by use of the Management frame, such as a Beacon, Probe Response, or Association Response or may be included in the RA control and can be notified to terminal 200. Like the RA ID, a suitable value for each BSSs can be configured by controlling the RA ID with the Management board. Alternatively, the RA ID table can be changed by using TF-R. If the RA ID table is controlled each time TF-R is transmitted, the overhead increases. However, in an environment where the situation of terminal 200 fluctuates greatly, adequate control to follow the fluctuation can be provided.

[0070] Returning to Figure 1, the generated RA control signal is wirelessly notified to terminal 200 by access point 100 (ST102).

[0071] The terminal 200 identifies the available RUs among the RA RUs indicated in the RA control signal notified (broadcast) by the access point 100 according to its terminal information. More specifically, terminal 200 refers to the RA ID table shared with access point 100 and identifies an RA ID associated with its own terminal information (e.g., information regarding reception quality, path loss, RSSI, or transmission power). interference). Thereafter, as the available RUs, the terminal 200 identifies, among the RA RUs indicated by the RA control signal, those allocated by the ID that is equal to the RA ID identified by using the RA ID table. Subsequently, the terminal 200 randomly selects one of the available RUs (ST103).

[0072] Terminal 200 generates a UL response signal (e.g., transmission storage information or a DL Data request signal) to be transmitted via random access (ST104).

[0073] The generated UL response signal is wirelessly notified to the access point 100 by terminal 200 using the RU RA selected in ST103 (ST105).

[0074] After receiving the UL response signal transmitted from the terminal 200 and correctly decoding the received UL response signal, the access point 100 refers to the RA ID table shared with the terminal 200 and obtains the terminal information with based on the RA ID associated with the RA RU used to transmit the UL response signal (ST106).

[0075] Access point 100 performs programming (e.g., frequency allocation, MCS selection, and transmission power control) of DL Data/UL Data based on the obtained terminal information (ST107).

[0076] The processing flow of the communication system according to the present embodiment was described above.

[0077] Figure 2 is a block diagram illustrating the main configuration of access point 100 in accordance with the present embodiment. In the access point 100 illustrated in Figure 2, the RA ID table storage unit 101 stores a plurality of random access IDs (RA IDs) used to instruct the terminal 200 which random access transmission frequency resources (RA RUs) ) use. Note that each of the plurality of random access IDs is uniquely associated with the communication state between the access point 100 and the terminal 200 performing the random access. An RA control signal generating unit 104 generates a random access control signal (TF-R) including allocation information indicating at least one transmission frequency resource. Note that each of the at least one transmission frequency resource has one of a plurality of random access IDs assigned to it. A wireless transceiver 106 transmits a random access control signal.

[0078] Figure 3 is a block diagram illustrating the main configuration of terminal 200 in accordance with the present embodiment. In the terminal 200 illustrated in Figure 3, an RA ID table storage unit 205 stores a plurality of random access IDs (RA IDs) used to instruct the terminal 200 about which random access transmission frequency resources (RA RUs) use. Note that each of the plurality of random access IDs is uniquely associated with the communication state between the terminal 200 performing the random access and the access point 100. A wireless transceiver 202 receives a control signal from random access (TF-R) including allocation information indicating at least one transmission frequency resource. Note that each of the at least one transmission frequency resource has one of a plurality of random access IDs assigned to it. Among at least one transmission frequency resource, a RU RA selection unit 207 selects one of the transmission frequency resources to which the random access ID associated with the communication state of the terminal 200 is assigned. The wireless transceiver 202 transmits a random access signal (a UL response signal) by utilizing the selected transmit frequency resource.

Access Point 100 Configuration

[0079] Figure 4 is a block diagram illustrating the configuration of access point 100 in accordance with the present embodiment. In Figure 4, the access point 100 includes the RA ID table storage unit 101, an RA transmission ID configuration unit 102, a Data transmission ID configuration unit 103, the data signal generation unit RA control 104, a transmit signal generating unit 105, a wireless transceiver 106, an antenna 107, a receive signal demodulation unit 108, a UL response signal decoding unit 109, a information acquisition terminal 110, and a programming unit 111. The wireless transceiver 106 includes a transmitting unit and a receiving unit. Note that the RA ID table storage unit 101, the RA transmission ID configuration unit 102, the data transmission ID configuration unit 103, the RA control signal generation unit 104, the terminal information acquisition unit 110, and programming unit 111 constitute an access control unit (MAC: Medium Access Control).

[0080] The RA ID table storage unit 101 stores an RA ID table in which the communication status (e.g., reception quality, path loss, RSSI, or interference power) of each of the terminals 200 that perform random access is uniquely associated with one of the plurality of RA IDs used to instruct the terminal 200 which RA RUs to use. The RA ID table is shared between the access point 100 and the terminal 200. Note that the RA ID is a common ID among the plurality of terminals 200. Consequently, the conflict between the UL response signals transmitted using the same RA ID may occur at the time of reception at the access point 100. A method for configuring the RA ID table is described below.

[0081] The RA transmit ID configuration unit 102 selects, from among the plurality of RA IDs defined in the RA ID table stored in the RA ID table storage unit 101, the RA IDs used to instruct the terminal 200 which RA RUs utilize and configure the RA IDs as RA IDs for terminal 200. Note that one or more RA RUs are configured for each of the frames, and the selected RA IDs are assigned to the respective RA RUs. As described above, since RA ID and terminal communication state are associated with each other in the RA ID table, the terminal 200 that can use RA RU is limited according to RA ID (i.e., the communication state ) assigned to RU RA. The RA transmission ID configuration unit 102 sends, to the RA control signal generation unit 104 and the terminal information acquisition unit 110, allocation information indicating the RA IDs each having a designated RA RU. for the same.

[0082] The data transmission ID configuration unit 103 configures a terminal ID (AID) to indicate the RU for UL Data programmed by the programming unit 111 described below (the non-conflicting RU). The ID set by the data transmission ID configuration unit 103 is a unique ID identifying a terminal among the terminals 200 connected to the access point 100. Consequently, UL Data transmitted from the terminals 200 does not conflict with one another. the other upon reception at access point 100.

[0083] The RA control signal generating unit 104 generates an RA control signal to request the terminal 200 to transmit the UL Data or the UL response signal. The RA control signal includes frequency resource (RU) allocation pattern information (terminal common information) in the system band, allocation information for RUs (terminal specific information) and the like. The allocation information for RUs includes the RA ID configured by the RA transmission ID configuration unit 102 or the UL Data ID (AID) configured by the Data transmission ID configuration unit 103. Additionally, the RA control signal includes information necessary for terminal 200 to generate the UL signal, such as MCS (modulation and coding scheme) of the UL signal (UL Data or a UL response signal) or transmit power information.

[0084] The transmission signal generation unit 105 performs coding and modulation processing on the RA control signal recorded from the RA control signal generation unit 104. After that, the transmission signal generation unit 105 adds to the modulated signal control signals (also referred to as "preamble"), such as a pilot signal and a channel estimation signal used for frequency synchronization and timing synchronization on the receive side (terminal 200) to generate a radio frame (a broadcast signal). After that, the transmission signal generating unit 105 sends the radio frame to the wireless transceiver 106.

[0085] The wireless transceiver 106 performs predetermined radio transmission processing (e.g., D/A conversion on the signal input from the transmission signal generation unit 105 and upconversion on the carrier frequency). After that, the wireless transceiver 106 transmits the signal subjected to radio transmission processing through the antenna 107.

[0086] Upon receipt from terminal 200 of a UL response signal (a response signal in response to the RA control signal transmitted by access point 100), access point 100 operates as follows. That is, the radio signal received through the antenna 107 is registered at the wireless transceiver 106. The wireless transceiver 106 performs predetermined radio reception processing, such as carrier frequency downconversion, on the radio signal and sends the signal subjected to radio reception processing to the receive signal demodulation unit 108.

[0087] The receive signal demodulation unit 108 extracts the received radio frame through, for example, autocorrelation processing. After that, the receiving signal demodulation unit 108 sends the radio frame to the UL response signal decoding unit 109.

[0088] After receiving the recorded radio frame from the receive signal demodulation unit 108, the UL response signal decoding unit 109 demodulates and decodes the UL response signal included in any of the RA RUs indicated by the RA control signal. If there is no reception error in the UL response signal, the UL response signal decoding unit 109 sends, to the terminal information acquisition unit 110, the data included in the UL response signal (the terminal ID, transmission information from terminal 200 (e.g., transmission buffer information or a request for DL Data)) and information indicating the RU by which the UL response signal was received (hereinafter referred to as "receiving RU"). However, if there is a reception error in the UL response signal, the UL response signal decoding unit 109 does not send anything to the terminal information acquisition unit 110.

[0089] The terminal information acquisition unit 110 acquires the terminal ID of the terminal 200 that transmitted the UL response signal through random access and communication status (e.g., reception quality, path loss, RSSI or interference energy) of terminal 200 based on the terminal ID and receive RU registered from the RA transmit ID configuration unit 102, and RA ID table (the correspondence relationship between the RA ID and the communication state) stored in the RA ID table storage unit 101. More specifically, the terminal information acquisition unit 110 identifies the RA ID corresponding to the receiving RU based on the correspondence relationship between the RA ID and the RA RU indicated by the RA ID information. allocation and identifies the communication state associated with the RA ID identified as the communication state of terminal 200.

[0090] Programming unit 111 performs programming (e.g., frequency allocation, MCS selection, transmission power control) of DL Data/UL Data after random access based on the communication status of terminal 200 recorded from of terminal information acquisition unit 110.

Terminal 200 Configuration

[0091] Figure 5 is a block diagram illustrating the configuration of terminal 200 in accordance with the present embodiment. In Figure 5, terminal 200 includes an antenna 201, a wireless transceiver 202, a receive signal demodulation unit 203, a RA control signal decoding unit 204, an RA ID table storage unit 205, a terminal information configuration unit 206, a RU RA selection unit 207, a UL response signal generating unit 208, and a transmission signal generating unit 209. The wireless transceiver 202 includes a transmission unit and a reception unit. Note that the ID table storage unit RA 205, the terminal information configuration unit 206, the RU selection unit RA 207 and the UL response signal generation unit 208 constitute an access control unit ( MAC).

[0092] The wireless transceiver 202 receives the signal transmitted from the access point 100 (figure 4) through the antenna 201, performs predetermined radio reception processing, such as down conversion and A/D conversion, in the received signal, and sends the signal subjected to radio reception processing to the receive signal demodulation unit 203. Additionally, the wireless transceiver 202 performs predetermined radio transmission processing, such as D/A conversion at the input signal from the transmission signal generation unit 209 and upconverting the carrier frequency, which is described below. After that, the wireless transceiver 202 transmits the signal subjected to radio transmission processing through the antenna 201.

[0093] The receiving signal demodulation unit 203 extracts the received radio frame, for example, by autocorrelation processing, and sends the frame to the RA control signal decoding unit 204.

[0094] The RA control signal decoding unit 204 demodulates and decodes the RA control signal included in the transmit RU to the RA control signal in the radio frame registered from the receive signal demodulation unit 203 and sends , for the RU selection unit RA 207, the allocation information for RUs (terminal specific information) included in the RA control signal.

[0095] The ID RA table storage unit 205 stores an ID RA table that is the same as the D RA table maintained by the access point 100. That is, in the ID RA table of the ID RA table storage unit 205, the state of a terminal 200 that performs random access and one of the plurality of RA IDs are uniquely associated with each other.

[0096] The terminal information configuration unit 206 acquires the communication status (e.g., reception quality, path loss, RSSI, or interference power) of the terminal including the terminal information configuration unit 206 and configures the communication state as the terminal information.

[0097] The RA RU selection unit 207 determines, among the plurality of RUs indicated by the allocation information recorded from the RA control signal decoding unit 204, the RUs available to the terminal 200 for use as RA RUs based on the RA ID table stored in the RA D table storage unit 205 and the terminal information of the terminal 200 (communication status (e.g., reception quality, path loss, RSSI, or interference power) ) registered from the terminal information configuration unit 206. More specifically, the RU RA selection unit 207 identifies the RA ID associated with the communication state of the terminal 200 indicated by the terminal information configured by the terminal information configuration unit terminal 206 based on the RA ID table. Thereafter, the RU RA selection unit 207 determines the RU corresponding to the identified RA ID among the plurality of RUs registered from the RA control signal decoding unit 204 as the RUs usable by the terminal 200 as RU RA. That is, the RU RA selection unit 207 determines the RA RUs corresponding to the communication state of the terminal 200 as available RUs.

[0098] Subsequently, the RU RA selection unit 207 randomly selects one of the RA RUs that the terminal 200 has determined to be available and sends the information indicating the selected RU to the transmission signal generation unit 209.

[0099] The UL response signal generation unit 208 generates a UL response signal including the terminal ID of the terminal 200 and the transmission information (e.g., the transmission storage information or a DL Data request) of the terminal 200 and sends the UL response signal to the transmission signal generating unit 209.

[00100] The transmission signal generation unit 209 performs coding and modulation on the UL response signal recorded from the UL response signal generation unit 208. After that, the transmission signal generation unit 209 adds, to the modulated signal, the control signals (preambles) used for frequency synchronization and timing synchronization on the receiving side (the access point 100), such as a pilot signal and a channel estimation signal, to generate a signal frame. radio (a broadcast signal). After that, the transmission signal generating unit 209 sends the radio frame to the wireless transceiver 202. Note that the UL response signal is mapped to RU RA indicated by the information recorded from the RU RA selection unit 207.

Method for Configuring the RA ID Table

[00101] A method for configuring the above-described RA ID table maintained by the access point 100 and the terminal 200 is described in detail below.

[00102] Hereinafter, each of RA ID Table Configuration Methods 1 to 3 is described.

Configuration Method 1

[00103] An RA ID table is described in Configuration Method 1 in which the reception quality (e.g., SNR: Signal to Noise Ratio) of the terminal 200 performing random access and an RA ID are uniquely associated with a to the other. Figure 6A illustrates an example RA ID table in accordance with Configuration Method 1. Figure 6B illustrates an example TF-R including an RA control signal to be notified to the terminal 200 by the access point 100 in accordance with o Configuration Method 1.

[00104] In the RA ID table illustrated in Figure 6A, when the reception quality is high (e.g., SNR is 10 dB or more), an RA ID = 2008 is associated with the reception quality. When the reception quality is low (for example, the SNR is less than 10 dB), an RA ID = 2009 is associated with the reception quality.

[00105] In the example illustrated in Figure 6B, in the allocation information for RUs included in the RA control signal, RU 1 to RU 5 are configured as RA RUs. Additionally, in Figure 6B, an ID RA = 2008 is assigned to each of RU 1 through RU 3 and an ID RA = 2009 is assigned to each of RU 4 through RU 5. In other words, in Figure 6B, RU 1 to RU 3 are RUs that are usable by terminals 200 with high reception quality, and RU 4 and RU 5 are RUs that are usable by terminals 200 with low reception quality.

[00106] For example, a terminal 200 with high reception quality refers to the RA ID table illustrated in Figure 6A and identifies an RA ID = 2008 corresponding to the reception quality of the terminal 200 itself and determines that between RU 1 and RU 5 notified by TF-R illustrated in Figure 6B, RU 1 to RU 3 corresponding to an RA ID = 2008 are usable RA RUs. After that, the terminal 200 randomly selects one from the usable RU 1 to RU 3 and transmits the UL response signal by using the selected RU.

[00107] Additionally, upon receipt of the UL response signal transmitted by the terminal 200 (the reception quality: high), the access point 100 identifies the RA ID corresponding to the RU (the receiving RU) through which the response signal is transmitted. UL was received from RU 1 to RU 5 illustrated in Figure 6B (in this case, an ID RA = 2008 is identified). Thereafter, access point 100 refers to the RA ID table illustrated in Figure 6A and determines that the receive quality ("high") corresponding to identified RA ID = 2008 is the receive quality of terminal 200. Thereafter, the access point 100 performs programming for terminal 200 by using the reception quality acquired from terminal 200 and the transmission information indicated by the UL response signal.

[00108] It should be noted that the transmission and reception of a UL response signal are carried out by a terminal 200 with low reception quality in the same way as described above.

[00109] That is, by selecting the RU RA to be used for transmitting the UL response signal according to the reception quality of the terminal 200, the terminal 200 can implicitly notify the access point 100 about its own reception quality.

[00110] A method of configuring the RA ID is described with reference to an example of the TF-R format illustrated in Figure 7.

[00111] The TF-R includes common terminal information ("common information") including the allocation pattern of the RUs across all frequency resources and specific information for each of the terminals 200 ("terminal specific information (per information username)") assigned to each of the RUs. A terminal-specific information field has a 2-byte ID field, which includes a 12-bit AID subfield.

[00112] Here, values 2008 to 2047 (0 can be additionally included), which are reserved values for existing 12-bit AID (1 to 2007), can be used for RA ID. In this way, if terminal 200 is notified and a value between 1 and 2007 by the existing 12-bit AID, terminal 200 can determine that the RU is the programmed UL data RU. However, if a value between the reserved values 2008 to 2047 (0 may be additionally included) is notified, the terminal 200 may determine that the RU is a random access RU. Alternatively, as illustrated in the example of Figure 7, the 12-bit AID subfield and the 4-bit ID RA subfield may be arranged separately. Additionally, as illustrated in Figure 7, by arranging the RA ID subfield and the AID subfield adjacent to each other, the terminal 200 can perform a process (perform a determination) by using a 16-bit value including a 12-bit AID and a 4-bit RA ID at once.

[00113] Alternatively, in a method of configuring the RA ID, the RA ID may be configured as illustrated in an example of a TF-R format in Figure 8.

[00114] TF-R illustrated in Figure 8 includes pieces of information, each specific to one of the terminals 200 ("terminal specific information") equal in number to the number of allocated RUs. Terminal-specific information includes, for example, 12-bit User ID, RU allocation information, and MCS information.

[00115] Here, as illustrated in the example of Figure 8, the purpose of use information of the 11-bit AID (1 to 2007) and the 1-bit RA can be arranged separately in the 12-bit User ID field. The 1-bit RA usage purpose information can be used in the same way as in the RA ID table described above (e.g., Figure 6A). For example, as illustrated in Figure 9, the setting can be made so that the RA usage purpose information of 1 bit equals 0 indicates "reception quality: high", and the RA usage purpose information of 1 bit equal to 1 indicates "reception quality: low".

[00116] The example of the TF-R format illustrated in Figure 7 and Figure 8 can be applied to other modalities described below.

[00117] Thus, according to Configuration Method 1, by defining the ID RA table illustrated in Figure 6A, the reception quality of terminal 200 can be implicitly notified by the use of RU RA used to transmit the UL response signal . In this way, an increase in the overhead of the UL response signal can be reduced. Additionally, since the access point 100 can learn the reception quality of the terminal 200 in addition to the information explicitly indicated by the UL response signal, the access point 100 can efficiently schedule the transmission of DL Data/UL Data after random access can be performed and, in this way, system throughput (system performance) can be increased.

Configuration Method 2

[00118] An RA ID table is described in Configuration Method 2 in which the path loss of a terminal 200 that performs random access and an RA ID are uniquely associated with each other. Figure 10A illustrates an example of the RA ID table in accordance with Configuration Method 2. Figure 10B illustrates an example of a TF-R including the RA control signal to be notified to the terminal 200 by the access point 100 in accordance with with Configuration Method 2.

[00119] In the ID RA table illustrated in Figure 10A, an ID RA = 2008 is associated with a path loss that is large (e.g., 70 dB or more), and an ID RA = 2009 is associated with a path loss which is small (e.g. less than 70 dB).

[00120] In the example illustrated in Figure 10B, RU 1 to RU 5 are configured as RA RUs in the RU allocation information included in the RA control signal of each TF-R. Additionally, in Figure 10B, an ID RA = 2008 is assigned to each of RU 1 to RU 5 for a given time frame (Drive Frame No. 1), and an ID RA = 2009 is assigned to each from RUs 1 to 5 to another time frame (Trigger Frame No. 2). In other words, in Figure 10B, RUs 1 through 5 for Drive Frame No. 1 are RUs that are usable by a terminal 200 having a large path loss, and RUs 1 to 5 for Drive Frame No. 2 are RUs that are usable by a terminal 200 with a small path loss.

[00121] For example, terminal 200 with a large path loss refers to the ID RA table illustrated in Figure 10A and identifies an ID RA = 2008 corresponding to the path loss of terminal 200 itself. Thereafter, terminal 200 determines that among the TF-Rs illustrated in Figure 10B, RUs 1 through 5 for Drive Frame No. 1 corresponding to an ID RA = 2008 are available RA RUs. Subsequently, the terminal 200 randomly selects one of the RUs 1 to 5 available for Drive Frame No. 1 and transmits the UL response signal using the selected RU.

[00122] Additionally, the access point 100 identifies an RA ID (in this case, 2008) corresponding to the TF-R that the terminal 200 synchronizes (in this case, Trigger Frame No. 1) based on the reception timing of the UL response signal transmitted by terminal 200 (path loss: high). Thereafter, the access point 100 refers to the RA ID table illustrated in Figure 10A and determines that the ("large") path loss corresponding to the identified RA ID = 2008 is the path loss of the terminal 200. Thereafter, the access point 100 performs programming (e.g., transmission power control) of terminal 200 by utilizing the reception quality acquired from terminal 200 and the transmission information indicated by the UL response signal.

[00123] Note that the transmission and reception of a UL response signal are carried out by terminal 200 with a small path loss in the same way as described above.

[00124] That is, by selecting the RU RA of the time frame to be used for transmitting the UL response signal according to the path loss of the terminal 200, the terminal 200 can implicitly notify the access point 100 of the loss of route from terminal 200 itself.

[00125] In this way, according to Configuration Method 2, by defining the ID RA table illustrated in Figure 10A and by using the RU RA used to transmit the UL response signal, the path loss of terminal 200 can be notified implicitly. As a result of this, the transmission power control accuracy of DL Data/UL Data after random access is performed can be increased while reducing an increase in the overhead of the UL response signal.

[00126] Additionally, according to Configuration Method 2, as illustrated in Figure 10B, terminals 200 having similar path loss levels can perform random access at the same time. For example, in the case where the transmission power of terminal 200 is fixed, if terminals 200 having similar path loss levels perform random access at the same time, the reception power of the UL response signal transmitted from each of the terminals 200 through one of the RUs in the access point 100 is substantially the same. In this way, a reduction in performance caused by AGC (Adaptive Gain Control) at access point 100 can be avoided.

[00127] Note that to avoid a reduction in performance caused by AGC in uplink OFDMA, uplink transmission power control performed by terminal 200 to maintain the receive power density at access point 100 constant, is important. Accordingly, when the terminal 200 performs transmission power control, the access point 100 may set the target receive power (or an index in lieu of the target receive power, such as target receive power density) in the TF-R. For example, the target receive power can be notified by using the terminal specific information field for each of the RU allocations in the TF-R (reference to Figure 7). At this point, in the ID RA table, an ID RA and a path loss level are uniquely associated with each other, as illustrated in Figure 10A. Additionally, since closed-loop transmission power control is not usable in random access, terminal 200 may not be able to transmit with transmission power that satisfies the target receive power set by access point 100 For example, there is a case in which the received energy does not reach the target received energy even when the terminal 200 having a large path loss performs transmission with the maximum transmission energy. Accordingly, random access transmission performed by a terminal 200 that cannot satisfy the target reception power may be inhibited.

[00128] Thus, by defining the ID RA table illustrated in Figure 10A and sending the target receive energy through the use of TF-R, a reduction in the AGC performance of the access point 100 in receiving random access can be prevented when the Terminal 20 performs transmission power control. Additionally, by selecting the resource (e.g., time frame) usable by each of the terminals 200 according to the path loss level, the terminals 200 that can support the predetermined target receive power can be selected.

Configuration Method 3

[00129] An RA ID table is described in Configuration Method 3 in which a pair consisting of the reception quality of the random access terminal 200 and the MCS for modulating the UL response signal and the RA ID are singularly associated with a to the other. Figure 11A illustrates an example RA ID table in accordance with Configuration Method 3. Figure 11B illustrates an example TF-R including an RA control signal sent from the access point 100 to the terminal 200.

[00130] Additionally, in Figure 11A, it is considered that RUs with different bandwidths (numbers of tones) are configured as RA RUs.

[00131] In the RA ID table illustrated in Figure 11A, an RA ID = 2008 is associated with high reception quality (e.g., SNR is equal to or greater than 10 dB) and a high rate MCS (QPSK). coding = ^), and an RA ID = 2009 and associated with low reception quality (e.g. SNR is less than 10 dB) and a low rate MCS (BPSK, coding rate = ^).

[00132] In the example illustrated in Figure 11B, RUs 10 to 12 are configured as RA RUs in the allocation information for the RUs included in the RA control signal. The number of tones of each of RUs 10 to 11 is 52 tones, and the number of tones of RU 12 is 26 tones, and the bandwidths of the RUs are different. In Figure 11B, an ID RA = 2009 is allocated to RUs 10 and 11 having a large bandwidth, and an ID RA = 2008 is allocated to RU 12 having a narrow bandwidth. In other words, in Figure 11B, RUs 10 and 11 having a large bandwidth are RUs that are usable by terminals 200 with a low reception quality, and RU 12 having a narrow bandwidth is an RU that is usable by a 200 terminal with a high quality of reception.

[00133] For example, terminal 200 having a low reception quality refers to the RA ID table illustrated in Figure 11A to identify a RA ID = 2009 and low rate MCS corresponding to the reception quality of terminal 200 and determines that among the RUs 10 to 12 notified by TF-R illustrated in Figure 11B, RUs 10 and 11 corresponding to an RA ID = 2009 are usable RA RUs. Thereafter, the terminal 200 randomly selects one from the usable RU 10 and RU 11, and transmits a UL response signal modulated with a low rate MCS (BPSK, coding rate = ^) by using the selected RU.

[00134] Additionally, after receiving the UL response signal transmitted by terminal 200 (reception quality: low), the access point 100 identifies the RA ID (in this case, 2009) corresponding to the RU (receiving RU) through which the UL response signal was received among RUs 10 to 12 illustrated in Figure 11B. Thereafter, access point 100 refers to the ID RA table illustrated in Figure 11A and determines that the receive quality ("low") corresponding to ID RA = 2009 is the receive quality of terminal 200. Subsequently, the access point access 100 performs programming for terminal 200 by using the reception quality acquired from terminal 200 and the transmission information indicated by the UL response signal.

[00135] It should be noted that the transmission and reception of a UL response signal are carried out to a terminal 200 having a high reception quality in the same way as described above.

[00136] Thus, according to Configuration Method 3, by defining the ID RA table illustrated in Figure 11A, the reception quality of terminal 200 can be implicitly notified by the RU RA used to transmit the UL response signal. As a result of this, system throughput (system performance) can be increased while preventing an increase in UL response signal overhead.

[00137] Additionally, according to Configuration Method 3, the terminal 200 can transmit the UL response signal through random access by utilizing the bandwidth and MCS corresponding to the reception quality of the terminal 200. For example, when the transmit power of terminal 200 is fixed, terminal 200 can generate a UL response signal by using a suitable MCS. Consequently, the time duration of the UL response signal can be reduced, and the overhead can be reduced.

[00138] In Figure 11A, the case in which reception quality (high/low) is associated with RA ID is illustrated. However, instead of reception quality, path loss (large/small) can be associated with RA ID, as in Configuration Method 2. Even in such a case, the same effect can be obtained.

[00139] Configuration Methods 1 to 3 of the RA ID table were described above.

[00140] As described above, in accordance with the present embodiment, the access point 100 transmits, to the terminal 200, an RA control signal indicating the RA RU for which one of a plurality of RA IDs associated with the state of terminal 200 communication is designated. After that, the terminal 200 selects one of the usable RA RUs according to the actual communication state of the terminal 200 and performs random access by using the selected RA RU. As a result of this, the access point 100 may become aware of the communication status of the terminal 200 according to the RU RA used by the terminal 200 for random access. That is, since the terminal 200 does not need to explicitly notify the access point 100 of the communication state of the terminal 200, the control signal overhead in random access can be reduced. As a result of this, the access point 100 can increase the amount of information reported by the control signal while reducing the overhead of the control signal transmitted through random access. In this way, system performance can be reduced.

[00141] For example, according to an existing framework, the DL Data request signal (PS-Poll), which is described in detail below) transmitted from a terminal in a power-saving mode does not report terminal quality information. For this reason, the access point cannot accurately perform MCS control of DL Data after random access is performed. In contrast, according to the present embodiment, PS-Interrogation transmitted by terminal 200 in a power-saving mode can provide notification of the communication status of terminal 200 by utilizing RU RA for transmission. As a result, by using PS-Interrogation, the access point 100 can accurately perform MCS control of DL Data after random access is performed.

[00142] Note that the communication status of a terminal associated with a RA ID in the RA ID table is not limited to reception quality (the SNR) and path loss. Any parameter used for programming performed by the access point 100, for example, can be used as the communication state. For example, the communication state is one of the amount of uplink transmission storage, path loss, reception quality, RSSI, and interference energy.

Second Modality

[00143] As described above, in random access, there are a plurality of types and purposes of use of a UL response signal to be transmitted (hereinafter referred to as "RA types"). That is, the RA type indicates a variety of purposes for using random access.

[00144] Examples of the RA type include random access used to provide notification of transmission storage information and random access used for transmission performed when a terminal returns from power saving mode to normal mode.

[00145] Transmission storage information includes the presence/absence of data stored in the terminal's transmission temporary storage and amount of data (also referred to as a "storage amount" or a "queue size").

[00146] Additionally, the UL response signal transmitted by the terminal in a power saving mode through random access includes information to request the access point to transmit the DL Data generated during the power saving mode. More specifically, the terminal returns from power saving mode to a normal mode at the time of transmitting a TF-R indicated by the flag. After that, the terminal that returned from power saving mode randomly selects one of the RA RUs indicated by TF-R. Subsequently, by using the selected RU, the terminal transmits, to the access point, a UL response signal to request the DL Data generated and destined for the terminal itself during the power saving mode. This UL response signal is referred to as "PS-Poll". According to the existing Frame format, PS-Interrogation is a signal to transmit only the MAC Header for identification of a terminal. By utilizing such random access, the terminal can save energy.

[00147] Depending on the purpose of use (the type) of the random access described above, the amount of transmission information and the level of importance vary. Therefore, if random access collision having a large amount of transmission information or random access collision having a high level of importance occurs and thus reception at the access point is not successful, the influence on system performance is higher.

[00148] For example, the amount of information transmitted in random access for notification of transmission storage information is greater than in random access performed by a terminal in power saving mode to request DL Data. Additionally, the level of importance of random access for notification of transmission storage information sent by a terminal, which operates in a normal mode and has data in temporary transmission storage, is greater than that of random access for a Data request. DL transmitted by a terminal operating in power saving mode (the influence on system performance is greater). Note that the difference in importance level includes data with different endpoint priority levels.

[00149] Accordingly, in the present embodiment, a method capable of reducing the collision rate of random access having a large amount of transmission information or random access having a high level of importance and improving system performance is described.

[00150] Figure 12 is a block diagram illustrating the configuration of a terminal 300 in accordance with the present embodiment. Different from Figure 5, according to the configuration of Figure 12, the information to be registered in a RU RA selection unit 302 is configured by an RA type configuration unit 301 in Figure 2. The configuration of an access point 100 is the same as in the first modality (figure 4). However, according to the present embodiment, an ID RA table stored in the ID RA table storage units 101 and 205 differs from the table of the first embodiment (ID RA table is described in greater detail below).

[00151] In the RA ID table stored in the RA ID table storage units 101 and 205, a plurality of RA types having different levels of importance or different amounts of transmission information and a plurality of RA IDs are uniquely associated with each other. other.

[00152] In Figure 12, the RA type configuration unit 301 configures the type and purpose of use (RA type) of a UL response signal to be transmitted via random access.

[00153] As available RUs, the RU selection unit RA 302 identifies among a plurality of RUs indicated by the allocation information registered from the control signal decoding unit RA 204, those having an ID assigned to it that is equal to the RA ID associated with the RA type of the terminal including the RU selection unit RA 302 based on the RA ID table stored in the RA ID table storage unit 205 and the RA type registered from the RA type configuration unit 301. After that, the RU selection unit RA 302 randomly selects one of the identified RUs.

[00154] The UL response signal generation unit 208 generates a UL response signal including the terminal ID of the terminal 300 and transmission information (e.g., transmission storage information or a DL Data request) of the terminal 300 according to the RA type registered from the RA type configuration unit 301.

RA ID Table Configuration Method

[00155] A method of configuring the RA ID table maintained by the access point 100 and the terminal 300 is described in detail below.

[00156] Hereinafter, Configuration Methods 4 to 6 of the RA ID table are described.

Configuration Method 4

[00157] An RA ID table is described in Configuration Method 4 in which the RA type of the terminal 300 that performs random access and an RA ID are uniquely associated with each other. Figure 13A illustrates an example of the RA ID table in accordance with Configuration Method 4. Figures 13B and 13C illustrate an example of a TF-R including an RA control signal to be notified to the terminal 300 by the access point 100 according to Configuration Method 4.

[00158] Type A RA illustrated in Figure 13A represents random access providing notification of transmission storage information, and Type B RA represents random access for requesting DL Data. The type A RA used by a terminal having data in transmission buffer to provide notification of transmission storage information has a greater influence on system performance than the type B RA used by a terminal in power saving mode to perform the transmission. Accordingly, type A RA has a higher level of importance. Additionally, RA type A has a greater amount of information transmitted by using the UL response signal than RA type B.

[00159] In the RA ID table illustrated in Figure 13A, an RA ID = 2008 is associated with the random access RA type A (the level of importance: high (or amount of information: large)), and an ID RA = 2009 is associated with the random access of RA type B (the level of importance: low (or the amount of information: small)).

[00160] In an illustrative example in Figure 13B, as RA RUs, RUs 1 to 5 are configured in the allocation information for the RUs included in the RA control signal. Additionally, in Figure 13B, an ID RA = 2008 is assigned to each of RUs 1 through 4, and RA = 2009 is assigned to RU 5. Additionally, as illustrated in Figure 13B, the number of RUs configured for RA Type A, which has a high level of importance, is greater than the number of RUs configured for Type B RA. For example, in Figure 13B, RUs 1 through 4 are RUs usable by a Type A RA terminal 300, and RU 5 is an RU usable by a type B RA terminal 300.

[00161] For example, the terminal 300 transmitting a type A RA UL response signal refers to the RA ID table illustrated in Figure 13A and identifies an RA ID = 2008 corresponding to the type A RA configured for the terminal 300 itself. In this way, terminal 300 determines that among RUs 1 to 5 notified by the use of TF-R illustrated in Figure 13B, RUs 1 to 4 each corresponding to an RA ID = 2008 are available RA RUs. Thereafter, terminal 300 randomly selects one of the available RUs 1 to 4 and transmits the UL response signal using the selected RU.

[00162] In contrast, the terminal 300 that transmits a UL response signal from the type B RA refers to the RA ID table illustrated in Figure 13A and identifies an RA ID = 2009 corresponding to the type B RA configured for the terminal 300 itself. In this way, terminal 300 determines that among the RUs 1 to 5 notified by the use of TF-R illustrated in Figure 13B, RU 5 corresponding to an ID RA = 2009 is an available RU RA. Thereafter, terminal 300 transmits the UL response signal by using the usable RU 5.

[00163] As described above, in Figure 13B, the number of available RA RUs varies according to the amount of transmission information or level of importance of each of the RA types. More specifically, the number of RUs available to be configured increases with increasing amount of transmission information or level of importance. In this way, the collision rate of random access having a large amount of transmission information or a high level of importance can be reduced. As a result of this, the influence of random access collision on system performance can be reduced.

[00164] Another example of TF-R according to Configuration Method 4 is described below.

[00165] In an example illustrated in Figure 13C, with RA RUs, RUs 1 through 5 are configured in the allocation information for the RUs included in the RA control signal of each of the TF-Rs. Additionally, in Figure 13C, an ID RA = 2008 is assigned to each of RUs 1 through 5 for a given time frame (Drive Frame No. 1) and an ID RA = 2009 is assigned to each of the RUs from 1 to 5 to another time frame (Trigger Frame No. 2).

[00166] In Figure 13C, terminal 300 randomly selects from RUs 1 to 5 for Drive Frame No. 1 or Drive Frame No. 2, according to the RA type of the UL response signal to be transmitted, and transmits a UL response signal by using the selected RU.

[00167] Thus, in Figure 13C, terminals 300 that transmit UL response signals of the same type of RA having the same amount of transmission information can perform random access in the same time frame (in synchronization with the same TF -R). In this way, as in Figure 13B, the collision rate of random access having a large amount of transmission information or a high level of importance can be reduced. Additionally, in each of the time frames, the number of padding bits required to become the frame lengths of the UL response signals from a plurality of equal terminals 300 can be reduced and, in this way, the overhead can be reduced. reduced.

Method of Determining Number of RU Allocations for DL Data Request

[00168] A specific example of a method for determining the number of RUs allocated for random access to request DL Data (the number of RU allocations) is described below. The access point may be aware of the presence/absence of downlink data pertaining to a terminal in a power saving mode and the Beacon reception frequency at the terminal based on information such as the TIM element (TIM Indication Map). Traffic) and Listening Range. The TIM element is included in a beacon frame transmitted by the access point. The TIM element is notified to the terminal. Additionally, the Listening Interval is included in an Association Request frame and a Reassociation Request frame and is notified to the access point. More specifically, the TIM element contains information regarding the downlink data (Storable Unit (BU)) that the access point stores. Additionally, the Listening Interval includes information regarding the Beacon reception frequency at the terminal. Additionally, the FC (Frame Control) field includes a Power management field. The access point can be made aware that the terminal is in power saving mode by using the Power management field (reference, for example, NPL 5).

[00169] If the terminal determines that there is data intended for it based on the TIM information, the terminal transmits a DL Data Request signal (PS-Interrogation) to the access point. That is, the maximum number of terminals that transmit the DL Data request signal through random access is indicated by the TIM information. Additionally, in some cases, the access point can predict the presence or absence of PS-Interrogation from a specific terminal with a high degree of accuracy based on the previous DL Data Request (PS-Interrogation) signal and Listening Interval. However, the access point does not always accurately know the Beacon reception timing at the terminal. Consequently, it is efficient to determine the number of RU allocations for PS-Interrogation through random access based on probabilistic estimation.

[00170] A specific method for determining the number of RU allocations for PS-Interrogation is described below.

[00171] Access point 100 assumes that terminal 300 having downlink data (indicated by TIM information) transmits PS-Interrogation with a probability of 1/(Listen Interval) in the signaling interval (BI). The access point 100 can estimate the expected value of the number of PS-Interrogations in the BI by calculating the number of PS-Interrogations in the BI for all target terminals 300. For example, the access point 100 can allocate the RUs to PS- Interrogation based on a predetermined relationship (e.g., doubling or rounding to the nearest decimal point) with the estimated expected value. Alternatively, the access point 100 may calculate the number of RUs for PS-Interrogation based on, for example, theoretical dispersion that may be calculated from the number of terminals. If the number of RU allocations becomes smaller than the expected value, random access collision increases. However, if the number of RU allocations becomes greater than or equal to several times the expected value, the unused RU increases and thus efficiency decreases. As a result of this, the number of RU allocations must be configured to a value within the range of about one to three times the expected value. In particular, it is desirable that the number of RU allocations is within the range of one to two times the expected value.

[00172] Alternatively, the access point 100 may predict the next BI access from the Listening Interval to the terminal 300 that has many chances to transmit PS-Interrogation (e.g., the terminal 300 that responded to the most recent TF-R ) and can allocate the RU with a specified terminal ID (STA_ID) instead of using random access. In this case, the access point 100 may perform the PS-Interrogation RU allocation described above for a terminal other than the terminal 300 to which the RU with the specified terminal ID is allocated.

[00173] As described above, access point 100 appropriately determines the number of RUs allocated to each of the RA types for a DL Data request based on storage information destined for terminal 300 in a power saving mode and the parameter that defines the cycle in which each of the terminals 300 in power save mode receives the flag. In this way, the random access collision rate for a DL Data request can be reduced.

Configuration Method 5

[00174] In Configuration Method 5, an example of the operation of a RA ID table is described in which the RA type of the terminal 300 that performs random access and the RA ID described in Configuration Method 4 are singularly associated with a with the other. That is, the RA ID table according to Configuration Method 5 is the same as the RA ID table according to Configuration Method 4 (Figure 13A). However, the ID RA table is characterized by the operation of the method of allocating an ID RA to a RU RA.

[00175] Figure 14 illustrates the RU allocation pattern being discussed in the 11ax standardization (reference, for example, to NPL 4). The numerical values illustrated in Figure 14 indicate the number of tones that constitute RU No. 1 to RU No. 9 (also referred to as "number of subcarriers"). As illustrated in Figure 14, in the RU allocation pattern for 20 MHz or less, only the center RU (RU No. 5 surrounded by a black border in Figure 14) can be allocated. Here, since the bandwidth of the central RU (26 tones) is the minimum, and the central RU is a resource in the vicinity of the DC subcarrier, the interference is large, so that the reception performance may be lower than that of other RUs.

[00176] Therefore, in Configuration Method 5, attention is focused on the problem mentioned above regarding the central RU, and the UL response signals of an RA type with a low level of importance or an RA type with a small amount of importance. transmission information are allocated in the central RU.

[00177] More specifically, an RA ID associated with an RA type having a low level of importance or a small amount of information is assigned to a RU having a frequency band in the vicinity of the DC subcarrier among the RA RUs notified to terminal 300 Additionally, an RA ID associated with an RA type having a frequency band other than the frequency band in the vicinity of the DC subcarrier.

[00178] Figure 15 illustrates an example of a TF-R including an RA control signal to be notified to the terminal 300 by the access point 100 in accordance with Configuration Method 5. In an example illustrated in Figure 15, the RU 3 to RU 7 are configured, as RA RUs, in the allocation information for RUs included in the RA control signal. Similarly, as Figure 14 illustrates, RU 5 is configured as the central RU in Figure 15.

[00179] As illustrated in Figure 15, an ID RA = 2008 is assigned to RUs 3, 4, 6 and 7, which are not the central RU, and an ID RA = 2009 is assigned to RU 5 which is the RU central. That is, in Figure 15, RUs 3, 4, 6 and 7 are RUs usable by terminal 300 that transmits a Type A RA UL response signal with a high level of importance (or a large amount of transmission information). RU 5 is a RU usable by terminal 300 that transmits a type A RA UL response signal with a low importance level (or a small amount of transmission information).

[00180] In Figure 15, an RU used to transmit a type B RA UL response signal with a low level of importance or a small amount of transmission information is limited to the central RU.

[00181] As described above, in accordance with Configuration Method 5, the terminal 300 transmits a UL response signal of an RA type with a low level of importance or a small amount of transmission information by utilizing the central RU that may cause degradation of the reception performance of the access point 100 while the terminal 300 transmits a UL response signal of an RA type with a high level of importance or a large amount of transmission information by utilizing an RU in addition to the RU central. In this way, a reduction in system performance caused by degradation of random access reception performance can be realized.

Configuration Method 6

[00182] In Configuration Method 6, an example of the operation of the RA ID table is described in which the RA type of the terminal 300 that performs random access and an RA ID described in Configuration Method 4 are singularly associated with a with the other. That is, the RA ID table according to Configuration Method 6 is the same as the RA ID table according to Configuration Method 4 (Figure 13A). However, Configuration Method 6 is characterized by operating a method of assigning an ID RA to an RU RA.

[00183] More specifically, from among the RA RUs notified to terminal 300, an RA ID associated with an RA type with a small amount of transmission information is assigned to an RU having a bandwidth less than or equal to a predetermined value. , and an RA ID associated with an RA type with a large amount of transmission information is assigned to an RU having a bandwidth greater than the predetermined value.

[00184] Figure 16 illustrates an example of a TF-R including the RA control signal to be notified to the terminal 300 by the access point 100 in accordance with Configuration Method 6. In the example illustrated in Figure 16, the RU 10 to RU 12 are configured, as RA RUs, in the allocation information for the RUs included in the RA control signal. Note that the number of tones of each of the RUs 10 to 11 is 52, and the number of tones of RU 12 is 26. Therefore, the bandwidths of the RUs differ from each other

[00185] As illustrated in Figure 16, an ID RA = 2008 is allocated to RUs 10 and 11 having a large bandwidth, and an ID RA = 2009 is allocated to RU 12 having the narrow bandwidth. For example, in Figure 16, RUs 10 and 11 are RUs usable by terminal 300 that transmits a Type A RA UL response signal having a large amount of transmission information, and RU 12 is a RU usable by terminal 300 that transmits a type A RA UL response signal having a small amount of transmission information.

[00186] As described above, according to Configuration Method 6, the terminal 300 can generate a UL response signal by using an RU with a bandwidth that corresponds to the amount of transmission information. In this way, in the RUs, the frame lengths of the UL response signals transmitted by the terminals 300 can be made substantially equal, and in this way, the amount of padding required to make the terminals 300 have the same frame length can be reduced. As a result of this, the time duration of the UL response signal can be reduced and thus the overhead can be reduced.

[00187] Configuration Methods 4 to 6 of the RA ID table were described above.

[00188] As described above, according to the present embodiment, the access point 100 transmits, to the terminal 300, an RA control signal indicating the RA RUs, each having an RA ID assigned to it. The RA ID is associated with the RA type of the terminal 300. After that, the terminal 300 selects an available RU RA according to the actual RA type of the random access performed by the terminal 300 and performs the random access by using the RU RA selected. That is, the RA RUs usable by the terminals 300 vary depending on the type of RA. Therefore, according to the present embodiment, the collision rate of random access with a large amount of transmission information or random access with a high level of importance can be reduced and in this way, the performance of the system can be increased.

Third Modality

[00189] Figure 17 is a block diagram illustrating the configuration of a terminal 400 in accordance with the present embodiment. According to the configuration of Figure 17, unlike Figure 5, the information to be registered to a RU RA selection unit 402 is configured by a transmission storage information configuration unit 401. The configuration of an access point 100 is the same as the first modality (figure 4). However, according to the present embodiment, the RA ID table stored in the RA ID table storage units 101 and 205 differs from the table of the first embodiment (the RA ID table is described in greater detail below).

[00190] In the RA ID table stored in the RA ID table storage units 101 and 205, random access traffic types (TIDs: traffic identifiers) are uniquely associated with a plurality of RA IDs.

[00191] In Figure 17, the transmission storage information configuration unit 401 configures a random access transmission storage information traffic type (e.g., Best Effort or Voice). Note that transmission storage information is information regarding the presence/absence of data stored in transmission temporary storage or the amount of data (also referred to as a "temporary storage amount" or a "queue size") .

[00192] As available RUs, the RU selection unit RA 402 identifies, among a plurality of RUs indicated by the allocation information recorded from the control signal decoding unit RA 204, those that have each received an ID which is equal to the RA ID associated with the terminal traffic type including the RU selection unit RA 402 based on the RA ID table stored in the RA ID table storage unit 205 and the traffic type recorded from the transmission storage information configuration unit 401. Thereafter, the RU RA selection unit 402 randomly selects one of the identified RUs.

[00193] The UL response signal generation unit 208 generates a UL response signal according to the traffic type of the transmission storage information registered from the transmission storage information configuration unit 401. Configuration Method from the RA ID Table

[00194] A method of configuring the RA ID table maintained by the access point 100 and the terminal 400 is described in detail below.

Configuration Method 7

[00195] According to Configuration Method 7, an RA ID table is described in which a traffic type of transmission storage information transmitted by the terminal 400 that performs random access and an RA ID are uniquely associated with a to the other. Figure 18A illustrates an example of the RA ID table in accordance with Configuration Method 7. Figure 18B illustrates an example of a TF-R including an RA control signal to be notified to the terminal 400 by the access point 100 in accordance with with Configuration Method 7.

[00196] In the RA ID table illustrated in Figure 18A, a RA ID = 2008 is associated with random access to a terminal having "Best Effort" data, a RA ID = 2009 is associated with random access to a terminal having "Best Effort" data. of "Voice", and an ID RA = 2010 is associated with random access to a terminal having data among a plurality (or all) of traffic types.

[00197] In the example illustrated in Figure 18B, RUs 1 to 5 are configured, with RA RUs, in the allocation information for RUs included in the RA control signal. Additionally, in Figure 18B, an ID RA = 2008 is assigned to RUs 1 and 2, an ID RA = 2009 is assigned to RU 3, and an ID RA = 2010 is assigned to RUs 4 and 5. In other words, In Figure 18B, RUs 1 and 2 are RUs usable by terminal 400 having "best effort" data (broadcast storage), RU 3 is a RU usable by terminal 400 having data (broadcast temporary storage) of "Voice " and RUs 4 and 5 are RUs usable by terminal 400 having data among a plurality (all) traffic types.

[00198] For example, the terminal 400 having "Best Effort" data refers to the RA ID table illustrated in Figure 18A to identify an RA ID = 2008 corresponding to the traffic type of the terminal 400 itself and determines that among the RUs of 1 to 5 notified by the TF-R illustrated in Figure 18B, RUs 1 and 2 corresponding to an ID RA = 2008 are usable RA RUs. After that, the terminal 400 randomly selects one of the RUs 1 and 2, which are usable, and transmits a UL response signal by using the selected RU.

[00199] Additionally, upon receipt of the UL response signal transmitted from terminal 400 (traffic types: Best effort), access point 100 identifies among RUs 1 to 5 illustrated in Figure 18B, an RA ID corresponding to the RU through which the UL response signal was received (the receiving RU) (in this case, 2008). Thereafter, access point 100 refers to the RA ID table illustrated in Figure 18A and determines that the traffic type ("Best Effort") corresponding to the identified RA ID = 2008 is the traffic type of terminal 400. Subsequently, the access point 100 performs programming for the terminal 400 by using the traffic type acquired from the terminal 400 and the transmission storage information indicated by the UL response signal.

[00200] Note that the transmission and reception of a UL response signal is carried out by the terminal 400 having data or other type of traffic illustrated in Figure 18B in the same way as described above.

[00201] That is, the terminal 400 selects a RU RA corresponding to the traffic type of the transmission storage information transmitted with a UL response signal according to the path loss of the terminal 400. In this way, the terminal 400 can implicitly notify the access point 100 of the traffic type of the terminal 400.

[00202] Thus, according to the present embodiment, by defining the RA ID table illustrated in Figure 18A and by using a RA RU used to transmit the transmission storage information of terminal 400 through random access, the type traffic information from the transmission storage information of the terminal 400 may be implicitly notified. As a result of this, the overhead of the UL response signal can be reduced. Additionally, in addition to the information clearly indicated by the UL response signal, the access point 100 may learn the traffic type of the data stored in the transmission storage by the terminal 400. As a result of this, the scheduling accuracy of the UL Data, after random access is performed, increases and, in this way, system performance can be increased.

Fourth Modality

[00203] According to 11ax, two types of terminal classes (also referred to as "STA classes") with different required accuracies, such as transmission power setting accuracies or RSSI measurement accuracies, are supported. A Class A terminal is a high-function terminal, and the transmission power setting accuracy (the absolute value) is required to be within +/- 3 dB. That is, a maximum configuration error of 3 dB is allowed for a Class A terminal in terms of the transmission power specified by the access point. In contrast a Class B terminal is a low function terminal, and the transmit power setting accuracy (the absolute value) needs to be within +/- 9 dB. That is, a maximum configuration error of 9 dB is allowed for a Class B terminal in terms of the transmission power specified by the access point.

[00204] The present embodiment focuses on solving the following problems related to terminal classes. Existing access points cannot schedule random access transmission from a terminal. Accordingly, if the random access transmission of a Class A terminal and the random access transmission of a Class B terminal occur in the same frame, the transmission signals are multiplexed by OFDMA. Therefore, the reception performance of the access point may deteriorate. More specifically, when a signal from a terminal with low transmission power configuration accuracy, such as a Class B terminal, is multiplexed by OFDMA, a large difference in reception power between the terminals can occur more easily. The occurrence of a large difference in reception energy between the terminals increases the influence of intercarrier interference caused by the breakdown of orthogonality in OFDMA. In particular, the reception performance for a terminal signal with a low reception power deteriorates greatly.

[00205] According to the present embodiment, a method capable of avoiding degradation of reception performance even when terminals of different terminal classes are present is described.

[00206] Figure 20 is a block diagram illustrating the configuration of a terminal 500 in accordance with the present embodiment. According to the configuration of Figure 20, unlike Figure 5, a terminal class configuration unit 501 configures information to be registered in a RU RA selection unit 502. The configuration of an access point 100 is the same as that of first modality (figure 4). However, according to the present embodiment, the ID RA table stored in the ID RA table storage units 101 and 205 differs from the table of the first embodiment (the ID RA table is described in greater detail below).

[00207] A terminal class (Class A or Class B) and a plurality of RA IDs are singularly associated with each other in the RA ID table stored in the RA ID table storage units 101 and 205.

[00208] In Figure 20, the terminal class configuration unit 501 configures the terminal class (Class A or Class B) of the terminal that includes the terminal class configuration unit 501.

[00209] As available RUs, the RU selection unit RA 502 identifies, among a plurality of RUs indicated by the allocation information recorded from the control signal decoding unit RA 204, those that have each received an ID which is equal to the ID RA associated with the terminal class of the terminal including the selection unit RU RA 502 based on the ID RA table stored in the ID table storage unit RA 205 and the terminal class registered from the configuration unit of terminal class 501. After that, the RU selection unit RA 502 randomly selected one of the identified RUs.

RA ID Table Configuration Method

[00210] A method of configuring the RA ID table maintained by the access point 100 and the terminal 500 is described in detail below.

Configuration Method 8

[00211] According to Configuration Method 8, an RA ID table is described in which the terminal class of the terminal 500 that performs random access and an RA ID are uniquely associated with each other. Figure 21A illustrates an example of the RA ID table in accordance with Configuration Method 8. Figure 21B illustrates an example of a TF-R including an RA control signal to be notified to the terminal 500 by the access point 100 in accordance with with Configuration Method 8.

[00212] In the RA ID table illustrated in Figure 21A, a RA ID = 2008 is associated with random access to a Class A terminal, and a RA ID = 2009 is associated with random access to a Class B terminal.

[00213] In the example illustrated in Figure 21B, as RA RUs, RUs 1 through 5 are configured in the allocation information for the RUs included in the RA control signal of each of the TF-Rs for a given time frame ( Drive frame No. 1). RUs 1 to 3 are configured for the timing frame (Drive Frame No. 2). Additionally, an RA ID = 2008 is assigned to RUs 1 through 5 of Drive Frame No. 1, and an RA ID = 2009 is assigned to RUs 1 through 3 of another time frame (Drive Frame No. 2).

[00214] In Figure 21B, terminal 500 randomly selects one of RUs 1 to 5 of Drive Frame No. 1 or RUs 1 to 3 of Drive Frame No. 2, according to the terminal class of terminal 500 and transmits a UL response signal by using the selected RU.

[00215] In Figure 21B, for the frame in which Class A terminals are multiplexed by OFDMA, since the transmission power setting accuracy of all terminals is high, the difference in reception power between the terminals does not increase and thus, the reception performance of the access point 100 does not deteriorate.

[00216] Additionally, in Figure 21B, for a frame in which Class B terminals are multiplexed by OFDMA, the number of multiplexes (the number of RUs to be configured) is reduced (limited) to a value lower than the number of multiplexes for a frame in which Class A terminals are OFDMA multiplexed. In this way, the influence of orthogonality breakdown in OFDMA is reduced, and in this way, the deterioration of the reception performance of the access point 100 can be reduced. Note that for a frame in which the Class B terminals are multiplexed by OFDMA, an MCS that is more robust (which has a higher interference tolerance) can be configured in addition to limiting the number of multiplexings.

[00217] As described above in Figure 21B, by configuring the RA IDs in the access point 100, terminals 500 of the same terminal class are multiplexed by OFDMA in the same time frame, and random access can be realized. In this way, reception performance degradation caused by orthogonality breakdown in OFDMA can be prevented.

[00218] That is, according to Configuration Method 8, by defining the RA ID table illustrated in Figure 21A, the access point 100 can schedule the random access of the terminal 500 in different time frames according to the class terminal. As a result of this, reception performance degradation caused by orthogonality breakdown in OFDMA can be prevented.

Configuration Method 9

[00219] According to Configuration Method 9, an example of the RA ID table operation is described in which a terminal class of terminal 500 that performs random access and a RA ID described in Configuration Method 8 are associated in a manner unique to each other. That is, the RA ID table according to Configuration Method 9 is the same as the RA ID table according to Configuration Method 8 (Figure 21A). However, the RA ID table is characterized by the operation of a method for assigning an RA ID to a RU RA.

[00220] Figure 21C illustrates an example of a TF-R including an RA control signal to be notified to the terminal 500 by the access point 100 in accordance with Configuration Method 9. In the example illustrated in Figure 2C, as RUs RA, RUs 1 to 5 are configured in the allocation information for the RUs included in the RA control signal of each TF-R. Additionally, in Figure 21C, an ID RA = 2008 is assigned to RUs 1 through 3, and an ID RA = 2009 is assigned to RUs 4 and 5.

[00221] Additionally, as illustrated in Figure 21C, among the RUs for the Class A terminal (the RUs having an RA ID = 2008 assigned to them), a robust MCS is applied to the RU that is adjacent to an RU for a terminal Class B (an RU having an RA ID = 2009 assigned to it), as distinguished from the RU that is not adjacent to a RU for a Class B terminal. For example, as illustrated in Figure 21C, among RUs 1 through 3 for the Class A terminal, BPSK is configured for RU 3 adjacent to the RU for the Class B terminal as a modulation scheme, and QPSK is configured for RU 1 and RU 2 that are not adjacent to a RU for a Class B terminal as a modulation scheme.

[00222] Note that among the RUs for a Class A terminal, an MCS having an MCS index less than or equal to a predetermined threshold may be configured for an RU that is adjacent to a RU for a Class B terminal, and an MCS having an MCS index that is greater than the predetermined threshold, may be configured for an RU that is not adjacent to an RU for a Class B terminal. For example, among the RUs for a Class A terminal, one MCs having an MCS index < 2 (modulation scheme/coding rate: BPSK ^, QPSK ^, QPSK %) can be configured for an RU that is adjacent to an RU for a Class B terminal, and an MCS having an index MCS > 2 (modulation scheme/coding rate: 16QAM ^, 16QAM %,...) can be configured for a RU that is not adjacent to a RU for a Class B terminal.

[00223] Alternatively, the modulation method may be fixed. Among the RUs for a Class A terminal, a coding rate less than or equal to a predetermined threshold may be configured for an RU that is adjacent to a RU for a Class B terminal, and a coding rate greater than the predetermined limit can be determined for a RU that is not adjacent to a RU for a Class B terminal. For example, among the RUs for a Class A terminal, an MCS with QPSK/coding rate = ^ can be configured for a RU that is adjacent to a RU for a Class B terminal, and an MCS with QPSK/coding rate = % can be configured for a RU that is not adjacent to a RU for a Class B terminal.

[00224] In Figure 21C, terminal 500 randomly selects one of RUs 1 to 3 or 4 to 5, according to the terminal class of terminal 500 and transmits a ULU response signal using the selected RU and MCS.

[00225] Thus, in Figure 21C, terminals 400 of different terminal classes are multiplexed by OFDMA at the same time as the frame by setting an RA ID made by the access point 100, and random access is performed. Additionally, in Figure 21C, among the RUs for a Class A terminal, a robust MCS is applied to a RU that is adjacent to a RU for a Class B terminal. Note that in terms of intercarrier, the interference caused by the Dismantle the orthogonality in OFDMA, the interference is more severe since the channels are closer together. For this reason, by configuring a robust MCS for the RU for a Class A terminal that is adjacent to a RU for a Class B terminal that has a high chance of producing large interference, the reception performance of the access point will deteriorate. 100 caused by orthogonality breakdown in OFDMA can be reduced even when Class A and Class B terminals 500 are OFDMA multiplexed in the same frame.

[00226] That is, according to Configuration Method 9, by defining the RA ID table illustrated in Figure 21A, the access point 100 allocates random access from terminal 500 to the RU corresponding to the terminal class and allocates a Robust MCS for an RU that has a high chance of producing large interference. In this way, the deterioration of reception performance of the access point 100 caused by orthogonality breakdown in OFDMA can be prevented.

Configuration Method 10

[00227] In 11ax, with respect to transmission power during continuous transmission (also referred to as "relative Tx power"), it is agreed that "the required accuracy of transmission power during continuous transmission performed by a Class B terminal is +/- 3 dB". Note that transmission power during continuous transmission means the transmission power required when a terminal continuously transmits an MU (multiple user) uplink transmission signal (corresponding to a UL response signal) within a period of time predetermined.

[00228] Even for a Class B terminal, the transmit power setting accuracy can be increased by the access point performing transmit power control (specifying the amount of relative correction with respect to the previous transmit power) on the terminal uplink MU transmission signal during continuous transmission. That is, even in Class B indicating a low function, transmission power setting accuracy of substantially the same level as in Class A indicating a high function is required during continuous transmission.

[00229] Accordingly, Setting Method 10 focuses on the transmission power setting accuracy described above during continuous transmission. According to Configuration Method 10, an RA ID is associated while taking into account information regarding whether continuous transmission is performed, in addition to the terminal class (Class A or B).

[00230] More specifically, in accordance with Configuration Method 10, an RA ID table is described in which the transmission power configuration accuracy (the required accuracy) required for the terminal 500 performing random access and an ID RA are uniquely associated with each other. Figure 22A illustrates an example of the RA ID table in accordance with Configuration Method 10. Figure 22B illustrates an example of a TF-R including an RA control signal to be notified to the terminal 500 by the access point 100 according to Configuration Method 10.

[00231] In the RA ID table illustrated in Figure 22A, an RA ID = 2008 is associated with random access to a Class A terminal and random access to a Class B terminal during continuous transmission and an RA ID = 2009 is associated with random access to a terminal of another type (Class B during non-continuous transmission). In other words, in the RA ID table illustrated in Figure 22A, a RA ID = 2008 is associated with random access to a terminal for which a high transmit power (request) configuration accuracy is required (+/- 3 dB in Figure 22A) and an ID RA = 2009 is associated with random access to a terminal for which a low transmit power (request) configuration accuracy is required (+/- 9 dB in Figure 22A).

[00232] In the example illustrated in Figure 22B, as RA RUs, RUs 1 through 5 are configured in the allocation information for RUs included in an RA control signal from each of the TF-Rs for a given time frame ( Trigger Frame No. 1) and RUs 1 to 3 are configured for another time frame (Trigger Frame No. 2). Additionally, an RA ID = 2008 is assigned to RUs 1 through 5 for Drive Frame No. 1, and an RA ID = 2009 is assigned to RUs 1 through 3 for another time frame (Drive Frame No. 2).

[00233] In Figure 22B, terminal 500 randomly selects one of RUs 1 to 5 for Drive Frame No. 1 or one of RUs 1 to 3 for Drive Frame No. 2, according to the required transmission power accuracy determined depending on the terminal class of the terminal 500 or whether the transmission signal is transmitted continuously or not. Thereafter, terminal 500 transmits the UL response signal using the selected RU.

[00234] Thus, in Figure 22B, for a frame in which terminals with a high required transmission power configuration accuracy perform OFDMA multiplexing, the transmission power configuration accuracies of all terminals being high. Consequently, a difference in reception power between the terminals does not increase, and thus the reception performance of the access point 100 does not deteriorate. Additionally, in Figure 21B, in a frame in which terminals with a low required transmission power configuration accuracy perform OFDMA multiplexing, the number of multiplexes (the number of RUs to be configured) is reduced (limited) to a value less than the number of multiplexings for the frame in which terminals with a required high transmission power configuration accuracy perform OFDMA multiplexing. In this way, the influence of orthogonality breakdown in OFDMA is reduced, and the deterioration of reception performance of access point 100 can be reduced. Note that for a frame in which terminals with a low required transmit power configuration accuracy perform OFDMA multiplexing, an MCS that is more robust (an MCS having a higher interference tolerance) can be configured in addition to the limitation the number of multiplexings.

[00235] As described above, according to Configuration Method 10, by defining the RA ID table illustrated in Figure 22A, the access point 100 can schedule the random access performed by the terminal 500 according to the configuration accuracy of required transmission power. As a result of this, like Configuration Methods 9 and 10, the deterioration of reception performance caused by orthogonality breakdown in OFDMA can be prevented.

Fifth Modality

[00236] In 11ax, the TF and TF-R format illustrated in Figure 24 are being studied. This format includes a common information field and a terminal-specific information field (called "Per-User Information") for each of the terminals 200 for allocating RUs. Each of the terminal-specific information fields includes the following subfields: AID 12 (12-bit AID), RU Allocation (RU allocation information), Encoding Type (encoding type information), MCS, DCM ( application indicator of Dual Subcarrier Modulations (DCM), SS Allocation (spatial multiplexing information), Target RSSI (transmission power control information) and Type-dependent Per User Information (Trigger Type-dependent terminal information) .

[00237] Additionally, in 11ax, it is agreed that when the AID to be notified by using the AID12 subfield illustrated in Figure 24 is equal to 0, the RU to be notified in the terminal specific information field is a random access transmission RU . That is, an AID = 1 to 2007 is used for scheduled access transmission in which a transmission RU is controlled by the AP for each of the terminals, and AID = 0 is used for random access transmission. Accordingly, AIDs other than the AIDs described above (2008 to 4095) in the 12-bit AID12 subfield are unused AIDs.

[00238] Additionally, in 11ax, the Basic Trigger that does not restrict the format of the UL response signal is defined as Trigger Type information included in the common information. The Basic Trigger allows a response through normal scheduled access and a response through random access. When the Trigger Type is the Basic Trigger, the Type-dependent Per-User Information subfield of the terminal-specific information field includes the information illustrated in Figure 24. That is, the Type-dependent Per-User Information subfield includes a trigger actor. 2-bit MU Spacing MPDU, which indicates a parameter indicating the minimum range of a PDU (MAC protocol data unit) that the AP can process, the 3-bit TID Aggregation Limit, which indicates a parameter indicating the maximum number of TIDs to be included in the MPDU, and 3-bit Reserved bits. These are parameters for using an A-MPDU (Aggregate AC Protocol Data Unit) formed by concatenating a plurality of MPDUs as a UL response signal.

[00239] The inventors of the present invention focused on the format of the terminal-specific information field described above so that a new RA ID (random access AID) and a RA ID table (information such as the purpose of using the RA) are defined. The terminal and access point configurations according to the present embodiment are the same as according to the first embodiment illustrated in Figures 4 and 5. However, the present embodiment is characterized by a method for defining the RA ID table stored in the ID RA table storage unit 101 illustrated in Figure 4 and ID RA table storage unit 205 illustrated in Figure 5.

[00240] According to the present embodiment, the structures of some fields included in the terminal-specific information field of the TF and TF-R formats illustrated in Figure 24 are switched according to the AID value reported by using the AID12 subfield. The operation is described in detail below.

RA ID Table Example 1

[00241] Figure 25 illustrates an example of the structure of the terminal-specific information field when an RA ID table according to example 1 is used. The operation performed when the ID RA table according to example 1 is used is described below with reference to Figure 25.

[00242] As illustrated in Figure 25, the structure of the Type-dependent User Information subfield is switched depending on whether the AID value reported by using the AID12 subfield is equal to 0 or X (X is an integer in the range from 2008 to 4095, which are unused AIDs). When AID=0, it is determined that the RA is used for normal RA transmission of uplink data and thus the information that is the same as in Scheduled access used to notify the information when AID = 1 to 2007 is included in the Type-dependent User Information. In this case, A-MPDU formed by concatenating a plurality of MPDUs can be used for the UL response signal (the number of concatenated MPDUs is not limited to any value). In contrast, when AID = included in the Type-dependent User Information. For example, as illustrated in Figure 25, the following information is included: 3-bit information (RA purpose) indicating the purpose of using RA, such as a report of transmission storage information (Temporary Storage Status Report ( Buffer (BSR)) or a Terminal Power "headroom" report, 2-bit headroom information regarding the transmission restriction (restriction information, for example, three patterns of "transmitted by only one terminal of Class A", "transmitted by only one Class B terminal", and "unrestricted"), a 1-bit MU MPDU Spacing Factor and 2-bit TID Aggregation Limit. When the AID value indicates specific RA usage , it may be prohibited for the UL response signal to include uplink data. However, it may be acceptable for the UL response signal to include uplink data depending on the purpose of using the RA. transmission is notified by using part of a normal data frame, the UL response signal may include uplink data. However, when the AID value indicates a specific use of RA, the number of concatenated MPDUs included in the A-MPDU used to transmit uplink data is limited to a predetermined value less than the number of concatenated MPDUs acceptable when the uplink data normal ascending are transmitted. In this way, the number of bits allocated to the MU MPDU Spacing factor and TID Aggregation Limit can be reduced.

[00243] Additionally, as illustrated in Figure 26, when AID = For example, information regarding the transmission restriction of a terminal may be included in the Type-dependent User Information as well as information regarding the purpose of use of the RA and STA transmission conditions. The RA for a BSR or similar purpose is basically used to transmit a single MPDU (MAC Protocol Data Unit) having a reduced size. Therefore, even when the UM MPDU Spacing Factor and TID Aggregation Threshold are set to fixed values under the consideration of the number of MPDUs = 1 and are not notified, the performance impact is small. For example, when a BSR is requested, the UL response signal frame is limited to a Single MPDU QoS Data frame (a frame for transmitting user data by using a QoS (Quality of Service) function) or a Null QoS frame (a frame corresponding to a QoS Data frame not including any data or a QoS Data frame having a data size of zero, however, a frame formed by the concatenation of a plurality of frames). of Null QoS is acceptable. That is, it is prohibited for a terminal to transmit BSR by using an A-MPDU formed by the concatenation of a plurality of MPDUs including the data entity (non-Null QoS frames). UM Spacing Factor MPDU notification can be eliminated and thus scalability and efficiency are improved.

[00244] The above AID = As a result of this, the information obtained in the 12-bit AID12 subfield can be considered as information in an 11-bit AID subfield and a 1-bit RA information switching indicator. This way, reception processing can be simplified. By setting the 11-bit AID subfield so that AID = 0, RA transmission is specified, as in an existing form. After that, it is determined whether to switch the structure of some of the fields included in the terminal specific information by using the RA information switching indicator, which is the MSB of the AID12 subfield. Note that the RA information switching indicator can be used for another purpose in the case of Scheduled access (when an AID = 1 to 2007 is notified).

[00245] Alternatively, the above AID = As a result of this, the MSB of the 12-bit AID12 subfield can be transformed into an unused Reserved bit that can be used for another purpose.

[00246] Figure 27 illustrates an ID RA table according to example 1. As illustrated in Figure 27, when AID = 0, the RA type is the data transmission RA. Information similar to that in Scheduled access is specified for the terminal by using the Type-dependent Information per User subfield. When AID = X (X is any integer in the range 2008 to 4095), RA type is RA transmission for a specific purpose. Detailed information regarding RA is specified for the terminal by using the Type-dependent User Information subfield.

[00247] As described here, according to an RA ID table of example 1, by switching the structure of the 8-bit Type-dependent User Information subfield included in the terminal-specific information according to the value of AID, the purpose of RA usage and RA transmission conditions that are instructions to the terminal can be expanded without increasing the amount of signaling.

RA ID Table Example 2

[00248] Figure 28 illustrates an example of the structure of the terminal-specific information field when an RA ID table according to example 2 is used. The operation performed when the RA ID table according to example 2 is used is described below with reference to Figure 28.

[00249] As illustrated in Figure 28, the information in the Reserved subfield of the Type-dependent User Information subfield is switched depending on whether the AID value reported by using the AID12 subfield = 0 or same way as in example 1 of table ID). When AID = 0, the same information as Scheduled access is configured, as in example 1 of the ID table. In contrast, when AID = is configured in the Reserved subfield of the Type-dependent Information by User subfield. For example, as illustrated in Figure 28, 3-bit information indicating the purpose of using RA (RA purpose) is configured.

[00250] Figure 29 illustrates the RA ID table according to example 2. As illustrated in Figure 29, when AID = 0, the RA type is the RA for data transmission, and a predetermined fixed bit sequence is included in the Reserved subfield of the Type-dependent User Information subfield, as in Scheduled access. When AID =

[00251] As described above, according to the RA ID table according to example 2, by utilizing the 3-bit Reserved subfield of the Type-dependent User Information subfield, RA transmission for a specific purpose can be dictated to the terminal without increasing the amount of signaling if the number of RA usage purposes to be defined and the RA transmission conditions are small.

RA ID Table Example 3

[00252] Figure 30 illustrates an example of the structure of a terminal-specific report field when an RA ID table according to example 3 is used. The operation performed when a RA ID table according to example 3 is used is described below with reference to Figure 30.

[00253] As illustrated in Figure 30, the information in the MCS subfield and SS Allocation subfield is switched depending on whether the AID value reported by using the AID12 subfield = 0 or X (where X is defined in the same way as in the example 1 of table ID). When AID = 0, the same information as in Scheduled access is configured in the MCS subfield and the SS Allocation subfield, as in example 1 of the ID table. In contrast, when AID = STA transmission conditions is configured in the SS Allocation subfield, and information regarding the terminal's transmission restriction (Restriction Information) is configured in the MCS subfield. At this time, when RA transmission for a specific purpose is performed, MCS and SS Allocation information (number of spatial sequences) is fixed in the most robust transmission condition. More specifically, MCS adopts the lowest rate modulation scheme and coding rate, and the number of spatial sequences is fixed to 1 (no multiplexing). In this way, adequate reception quality is guaranteed even when any of the terminals perform RA transmission for a specific purpose. Additionally, in a special-purpose RA such as BSR, since the transmission data size is relatively small compared to the normal data size, the influence of an increase in the overhead of utilizing a radio resource is small. even when the transmission condition is fixed at the most robust transmission condition.

[00254] Figure 31 illustrates a RA ID table according to example 3. As illustrated in Figure 31, when AID = 0, the RA type is RA for data transmission. The information that is the same as in Scheduled access is configured in the MCS subfield and SS Allocation subfield and is dictated to the terminal. When AID = X, the RA type is RA for transmission for a specific purpose. The detailed information regarding RA is configured in the MCS subfield and the SS Allocation subfield and is dictated to the terminal. Additionally, when AID=X, predetermined fixed values are applied to the MCS and the number of spatial sequences.

[00255] Thus, in an ID RA table according to example 3, by switching the information to be transmitted by using the 4-bit MCS subfield and 6-bit SS Allocation subfield according to the AID value, the n The number of RA usage purposes and the expansion capacity of the RA transmission condition can be increased. Note that when the number of RA usage purposes and the number of RA transmission conditions to be set are small, the information is only an MCS subfield and the SS Allocation subfield can be switched.

RA ID Table Example 4

[00256] Figure 32 illustrates an example of the structure of the terminal-specific information field when an ID RA table according to example 4 is used. The operation performed when the ID RA table according to example 4 is used is described below with reference to Figure 32.

[00257] As illustrated in Figure 32, the information in some of the subfields included in the terminal specific information field of the TF or TF-R format is switched depending on whether the value of the AID reported by using the AID12 subfield is equal to one of 1 to 2007 or 0. In Figure 32, like the RA ID table according to example 1, the information to be transmitted is switched by the information in the Type-dependent User Information subfield of the terminal-specific information field.

[00258] Figure 33 illustrates an RA ID table according to example 4. As illustrated in Figure 33, when the AID value is a value in the range 1 to 2007 (in Programmed access transmission), the information relating to the MU MPDU Spacing Factor and TID Aggregation Limit is configured in the Type-dependent Information per User subfield. In contrast, when AID = 0 (in RA transmission), it is determined that RA should be used for RA transmission for a specific purpose and RA transmission for data transmission. Like the RA ID table according to example 1, the purpose of using the STA and RA transmission conditions is configured in the Type-dependent User Information.

[00259] Thus, in the RA ID table according to example 4, by switching the information to be transmitted by using the 8-bit Type-dependent User Information subfield, according to the AID value, the number of RA usage purposes and the number of RA transmission conditions dictated to the terminal can be increased without increasing the amount of signaling. Note that while the example was described with reference to switching the information transmitted by using the Type-dependent User Information subfield, the switching scheme is not limited to this. Like examples 2 and 3 of the ID RA table, even when the information transmitted by using another subfield included in the User Information field is switched, the same effect can be obtained.

[00260] While examples 1 to 4 of the RA ID table have been described with reference to switching the transmitted information by using some of the subfields included in the User Information field in the RA transmission, examples are not limited thereto. Information switching can be applied to transmission through Programmed access. As illustrated in Figure 34, the information in the Type-dependent User Information subfield in Scheduled access is switched depending on whether the AID value notified by using the AID12 subfield is a value in the range 1 to 2007 or Y + 1 to Y + 2007 (Y is any value greater than or equal to the maximum value of the existing AID for Scheduled access and is less than or equal to the 12-bit value, that is, 2007 to 2088). For example, the value of Y is set to 2048. In this way, the terminal's AID is notified by using 11 bits of the AID12 subfield, and it is determined whether part of the information in the User Information field should be switched by using MSB of the AID12 subfield. This way, processing can be simplified.

[00261] In Figure 34, when AID = 1, the information regarding the Spacing Factor A MPDU and TID Aggregation Limit is configured in the Type-dependent User Information subfield for normal scheduled access performed by a terminal having AID = 1 When AID = 2048 + 1 = 2049, the purpose of using Scheduled access ("SA purpose" in Figure 34) and information indicating STA transmission conditions ("Restriction information" in Figure 34), for example, are configured. in the Type-dependent User Information subfield for Scheduled access for a specific purpose performed by a terminal having AID = 1. As illustrated in Figure 34, when the main purpose of use of Scheduled access for a specific purpose is transmitting a single MPDU with a reduced size, the influence on performance is small even if the MU MPDU Spacing Factor and TD Aggregation Threshold are set to fixed values (without notification) determined by considering the number of MPDUs = 1. In contrast, when AID = 0, the information indicating the purpose of using RA (RA purpose in drawings) and the STA transmission condition (Restriction information in drawings) are configured in the Type-dependent User Information subfield for Random access. This way, even in Scheduled access, the transmission of access programmed for a specific purpose can be dictated to the terminal without increasing the amount of signaling.

[00262] Embodiments of the present invention were described above.

Other Modalities

[00263] (1) The same effect can be obtained by combining the modalities described above. For example, as illustrated in Figure 19, an RA ID may be uniquely associated with a pair consisting of an RA type and reception quality. Alternatively, an RA ID may be uniquely associated with a pair consisting of traffic type and reception quality (not illustrated). Alternatively, part of the transmission format illustrated in Figure 7 may correspond to the RA ID type. For example, the first bit may be designated for type A identification and the second bit may be designated for type B identification.

[00264] (2) In each of the embodiments described above, the RA ID that is uniquely associated with the reception quality, RA type, or traffic type is defined. However, an RA ID that is not associated with any of reception quality, RA type, or traffic type can be defined and is configured in the RA ID table. For example, in the ID RA table illustrated in Figure 23, when the reception quality is high (for example, the SNR is equal to 10 dB or more), an ID RA = 2008 is associated. When the reception quality is low (e.g., SNR is less than 10 dB), a RA ID = 2009 is associated, and a RA ID = 2-1- is associated with any of the RA IDs that do not depend on the reception quality. Front desk.

[00265] For example, a terminal having a high reception quality may randomly select one of the RUs having an ID RA = 2008 assigned to it and RUs having an ID RA = 2010 assigned to it and transmit a response signal UL. Thus, if the reception quality distribution of the terminals accommodated by the access point 100 is oriented and thus the random access collision rate increases, an arbitrary ID (an RA ID = 2010 in Figure 23) is used as the RA ID. In this way, an increase in the collision rate of random access can be avoided.

[00266] (3) According to the embodiments described above, an aspect of the present description is realized by a hardware configuration, the present description may be provided by software in cooperation with hardware.

[00267] (4) The RA ID according to the embodiments described above is also referred to as a Random access AID.

[00268] (5) Terminals that do not have an AID (a terminal not associated with an AP) can carry out transmission through Random access by using an RU indicated by the RA ID in accordance with the modality described above. These terminals can carry out transmission using a random access RU without any restrictions on the type and purpose of use. Additionally, the type of terminal/purpose of use and transmission restriction for terminals that do not have an AID can be defined. For example, as one of the RA types, a specific RA ID may be assigned a purpose to a terminal that does not have an AID to transmit an Association Request. Additionally, in RA transmission for a specific purpose according to the fifth modality, the transmission of the Association Request may be dictated by the use of the purpose of use indicated by the User Information (RA purpose), and the transmission may be permitted for only one terminal that does not have AID due to the use of transmission restriction (Restriction Information).

[00269] Additionally, each of the functional blocks used to describe the above embodiments is typically provided as LSIs, which are integrated circuits. The integrated circuit may control each of the functional blocks used to describe the above embodiments and may have an input and an output. Integrated circuits may be formed as individual chips or may be integrated into a chip to include some or all of the integrated circuits. The term "LSI" is used here, but the terms "IC", "system LSI", "super LSI" or "ultra LSI" may also be used depending on the level of integration.

[00270] Additionally, circuit integration is not limited to LSI and can be performed by dedicated circuitry or a general purpose processor in addition to an LSI. A field programmable gate assembly (FPGA), which is programmable after LSI fabrication, or a reconfigurable processor that allows reconfiguration of circuit cell connections and configurations in LSI can be utilized.

[00271] Furthermore, in the event that a circuit integration technology replacing LSI appears as a result of advances in semiconductor technology or other technologies derived from the technology, the functional blocks may be integrated by utilizing such technology. Another possibility is the application of biotechnology, for example.

[00272] A communication device in accordance with the present description includes a storage unit that stores a plurality of random access IDs used to instruct a terminal which transmission frequency resources to use for random access, where each of the IDs random access control is uniquely associated with the communication state between a terminal performing random access and the communication device, a generating unit that generates a random access control signal including allocation information indicating at least one frequency resource of transmission, wherein each of the at least one transmission frequency resource has one of the random access IDs assigned to it and a transmission unit that transmits the random access control signal.

[00273] In the communication device according to the present description, each of the plurality of random access IDs is uniquely associated with the communication state of a terminal performing random access and an MCS (Modulation and Coding Scheme ).

[00274] In the communication device according to the present description, each of the plurality of random access IDs is uniquely associated with the type of information to be transmitted through random access.

[00275] In the communication device according to the present description, a random access ID associated with a random access type having a low level of importance or a small amount of information, is assigned to a resource having a frequency band in the proximity to a DC subcarrier among the transmit frequency resources, and a random access ID associated with a random access type having a low level of importance or a small amount of information, is assigned to a resource having a different frequency band of the frequency band in the vicinity of the DC subcarrier.

[00276] In the communication device according to the present description, the random access ID associated with a random access type having a small amount of transmission information, is assigned to a resource having a bandwidth less than or equal to a predetermined value among the transmission frequency resources, and a random access ID associated with a random access type having a large amount of transmission information, is assigned to a resource having a bandwidth greater than the predetermined value.

[00277] In the communication device according to the present description, each of the random access IDs is uniquely associated with a type of information traffic to be transmitted through the random access.

[00278] In the communication device according to the present description, each of the random access IDs is uniquely associated with a terminal class relating to transmission energy.

[00279] In the communication device according to the present description, each of the random access IDs is uniquely associated with a transmission power setting accuracy required by a terminal.

[00280] In the communication device according to the present description, the communication state is any one of an uplink transmission storage amount, a path loss, a reception quality, an RSSI, and interference energy.

[00281] A terminal in accordance with the present description includes a storage unit that stores a plurality of random access IDs used to instruct a terminal which transmission frequency resources to use for random access, where each of the Random access is uniquely associated with the communication state between a terminal performing random access and a communication device, a receiving unit, that receives a random access control signal including allocation information indicating at least one frequency resource transmission frequency resource, wherein each of the at least one transmission frequency resource has one of the random access IDs assigned to it, a selection unit that selects, from among the at least one transmission frequency resource, one of the resources transmission frequency, each having a random access ID that is the same as the random access ID associated with the terminal's communication state, and a transmission unit that transmits a random access signal by using the frequency resource selected transmission channel.

[00282] A communication method in accordance with the present description includes uniquely associating each of the random access IDs used to instruct a terminal as to which transmission frequency resources to use for random access with the state of communication between a terminal that performs random access and a communication device, generating a random access control signal including allocation information indicating at least one transmission frequency resource, when each of the at least one transmission frequency resource has one of the IDs random access control designated for it, and transmission of the random access control signal.

[00283] A communication method in accordance with the present description includes uniquely associating each of the random access IDs used to instruct a terminal as to which of the transmission frequency resources to use for random access with the state of communication between a terminal performing random access and a communication device, receiving a random access control signal including allocation information indicating at least one transmission frequency resource, wherein each of the at least one transmission frequency resource has one of the IDs random access resources assigned thereto, select, from among the at least one transmit frequency resource, one of the transmit frequency resources, each having a random access ID that is equal to the random access ID associated with the communication state of the terminal, and transmitting a random access signal by using the selected transmission frequency resource.

Industrial Applicability

[00284] One aspect of the present disclosure is to efficiently improve system performance by performing highly accurate scheduling of DL Data/UL Data after random access while reducing an increase in overhead of a UL response signal caused by random access. List of Reference Signals 100 access point 200, 300, 400, 500 terminal 101, 205 RA ID table storage unit 102 RA transmission ID configuration unit 103 data transmission ID configuration unit 104 generation unit RA control signal 105, 209 transmit signal generation unit 106, 202 wireless transceiver 107, 201 antenna 108, 203 receive signal demodulation unit 109 UL response signal decoding unit 110 information acquisition unit terminal 111 programming unit 204 control signal decoding unit RA 206 terminal information configuration unit 207, 302, 402, 502 RU selection unit RA 208 response signal generation unit UL 301 type configuration unit RA 401 transmission storage information configuration unit 501 terminal class configuration unit

Claims (40)

1. Communication apparatus (100), comprising: set of circuits (104) that, in operation, generates a control signal including a plurality of user-specific fields, each of the plurality of user-specific fields including a control field ID indicating that at least one resource unit (RU) is allocated to a corresponding terminal station (200); and a transmitter (106), which is coupled to the circuitry and which, in operation, transmits the control signal, wherein each of the ID fields indicates one of a plurality of Association IDs (AIDs) for scheduled access or one of a plurality of IDs for random access, characterized by the fact that values for the plurality of IDs for random access are different from any of the values of the plurality of AIDs for scheduled access, and each of the values of the plurality of IDs for random access indicates a communication status between the communication apparatus and the corresponding terminal station. 2. Communication apparatus according to claim 1, characterized in that one of the values of the plurality of IDs for random access indicates a terminal station not associated with the communication apparatus. 3. Communication apparatus according to claim 1, characterized by the fact that the values of the plurality of IDs for random access include at least one of 0 and integers from 2008 to 2047. 4. Communication apparatus according to claim 1, characterized by the fact that when the ID field indicates one of the plurality of IDs for random access, the ID field indicates one or more resource units (RUs), one of the which is randomly selected by the corresponding terminal station. 5. The communication apparatus of claim 1, wherein the control signal includes a common information field, wherein the common information field includes a trigger-type field indicating a type of the control signal. 6. The communication apparatus of claim 1, wherein the user-specific fields include an RSSI Target field indicating target reception power of a signal transmitted in response to the control signal. 7. The communication apparatus of claim 1, wherein when the ID field indicates one of the plurality of IDs for random access, the control signal includes a value corresponding to a type of traffic information transmitted through random access. 8. Communication apparatus according to claim 1, characterized by the fact that each of the values of the plurality of IDs for random access is associated with communication condition information between the communication apparatus and the corresponding terminal station, wherein the communication condition information indicates at least one of uplink transmission storage quantity, path loss, reception quality, received signal strength indicator (RSSI), and interference energy. 9. Communication apparatus, according to claim 1, characterized by the fact that each of the values of the plurality of IDs for random access is associated with a type of information transmitted through random access, with a transmission energy class of the corresponding terminal station, or accurately transmit power setting required for the corresponding terminal station. 10. The communication apparatus of claim 1, wherein the user-specific fields include an RU allocation field indicating that at least one RU is allocated to the corresponding terminal station. 11. Transmission method implemented by a communication apparatus, comprising the steps of: generating (ST101) a control signal including a plurality of user-specific fields, each of the plurality of user-specific fields including an ID field or which indicates that at least one resource unit (RU) is allocated to a corresponding terminal station; and transmitting (ST102) the control signal, wherein each of the ID fields indicates one of a plurality of Association IDs (AIDs) for programmed access or one of a plurality of IDs for random access, characterized by the fact that values of the plurality of IDs for random access are different from any of the values of the plurality of AIDs for scheduled access, and each of the values of the plurality of IDs for random access indicates a communication state between the communication apparatus and the corresponding terminal station. 12. Transmission method according to claim 11, characterized in that one of the values of the plurality of IDs for random access indicates a terminal station not associated with the communication apparatus. 13. The transmission method of claim 11, wherein the values of the plurality of IDs for random access include at least one of 0 and integers from 2008 to 2047. 14. Transmission method according to claim 11, characterized by the fact that when the ID field indicates one of the plurality of IDs for random access, the ID field indicates one or more resource units (RUs), one of the which is randomly selected by the corresponding terminal station. 15. The transmission method of claim 11, wherein the control signal includes a common information field, wherein the common information field includes a trigger type field that indicates a type of control signal. control. 16. The transmission method of claim 11, wherein the user-specific fields include a target RSSI field indicating the target reception power of a signal transmitted in response to the control signal. 17. Transmission method according to claim 11, characterized by the fact that when the ID field indicates one of the plurality of IDs for random access, the control signal includes a value corresponding to a traffic type information transmitted through random access. 18. Transmission method according to claim 11, characterized by the fact that each of the values of the plurality of IDs for random access is associated with communication condition information between the communication apparatus and the corresponding terminal station, wherein the communication condition information indicates at least one of an amount of uplink transmission storage, path loss, reception quality, received signal strength indicator (RSSI), and interference energy. 19. Transmission method according to claim 11, characterized by the fact that each of the values of the plurality of IDs for random access is associated with a type of information transmitted through random access, with a transmission energy class of the corresponding terminal station or accurately setting the transmission power required for the corresponding terminal station. 20. The transmission method of claim 11, wherein the user-specific fields include an RU allocation field indicating at least one RU that is allocated to the corresponding terminal station. 21. Terminal station (200), comprising: a receiver (202) that, in operation, receives from a communication apparatus, a control signal including a plurality of user-specific fields, each of the plurality of user-specific fields including an ID field which indicates that at least one resource unit (RU) is allocated to corresponding terminal stations including the terminal station wherein each of the ID fields indicates that one of the plurality of Association IDs (AIDs) for access programmed or one of a plurality of IDs for random access; and a transmitter (202) which, in operation, transmits to the communication apparatus, uplink data using the at least one RU in response to the control signal, characterized by the fact that values of the plurality of IDs for random access are different of any values of the plurality of AIDs for scheduled access, and each of the values of the plurality of IDs for random access indicates a communication state between the communication apparatus and the corresponding terminal stations. 22. The terminal station of claim 21, wherein one of the values of the plurality of IDs for random access indicates a terminal station not associated with the communication apparatus. 23. The terminal station of claim 21, wherein the values of the plurality of IDs for random access include at least one of 0 and integers from 2008 to 2047. 24. Terminal station according to claim 21, characterized by the fact that the ID field indicates those one of the plurality of Ids for random access, the ID field indicates one or more resource units (RUs), one of which is randomly selected by the corresponding terminal stations. 25. The terminal station of claim 21, wherein the control signal includes a common information field, wherein the common information field includes a trigger type field indicating a type of the control signal. 26. The terminal station of claim 21, wherein the user-specific fields include an RSSI Target field indicating target reception power of a signal transmitted in response to the control signal. 27. The terminal station of claim 21, wherein when the ID field indicates one of the plurality of IDs for random access, the control signal includes a value corresponding to a type of traffic information transmitted via access. random. 28. Terminal station according to claim 21, characterized by the fact that each of the values of the plurality of IDs for random access is associated with communication condition information between the communication apparatus and the corresponding terminal stations, wherein the Communication condition information indicates at least one of a quantity of uplink transmission storage, path loss, reception quality, RSSI, and interference energy. 29. Terminal station, according to claim 21, characterized by the fact that each of the values of the plurality of IDs for random access is associated with a type of information transmitted through random access, with a transmission power class of the terminal stations corresponding, or accurately transmit power configuration required for the corresponding terminal stations. 30. The terminal station of claim 21, wherein the user-specific fields include an RU allocation field that indicates at least one RU that is allocated to the corresponding terminal stations. 31. A receiving method implemented by a terminal station, comprising the steps of: receiving (ST102) from a communication apparatus, a control signal including a plurality of user-specific fields, each of the plurality of user-specific fields including an ID field, which indicates that at least one resource unit (RU) is allocated to a corresponding terminal station including the terminal station wherein each of the ID fields indicates one of the plurality of Association Ids (AIDs) for access programmed or one of a plurality of Ids for random access; and transmitting (ST104) to the communication apparatus, uplink data using at least one RU in response to the control signal, characterized in that values of the plurality of IDs for random access are different from any of the values of the plurality of AIDs for scheduled access, and each of the values of the plurality of IDs for random access indicates a communication state between the communication apparatus and the corresponding terminal stations. 32. The reception method of claim 31, wherein one of the values of the plurality of IDs for random access indicates a terminal station not associated with the communication apparatus. 33. The reception method of claim 31, wherein the values of the plurality of IDs for random access include at least one of 0 and integers from 2008 to 2047. 34. The reception method of claim 31, wherein when the ID field indicates one of the plurality of IDs for random access, the ID field indicates one or more resource units (RUs), one of the which is randomly selected by the corresponding terminal stations. 35. The reception method of claim 31, wherein the control signal includes a common information field, wherein the common information field includes a trigger-type field that indicates a type of control signal . 36. The reception method of claim 31, wherein the user-specific fields include a target RSSI field that indicates the target reception power of a signal transmitted in response to the control signal. 37. The reception method of claim 31, wherein when the ID field indicates one of the plurality of IDs for random access, the control signal includes a value corresponding to a traffic type information transmitted through random access. 38. Receiving method according to claim 31, characterized by the fact that each of the values of the plurality of IDs for random access is associated with communication condition information between the communication apparatus and the corresponding terminal stations, wherein the communication condition information indicates at least one of an amount of uplink transmission storage, path loss, reception quality, received signal strength indicator (RSSI), and interference energy. 39. Reception method according to claim 31, characterized by the fact that each of the values of the plurality of IDs for random access is associated with a type of information transmitted through random access, with a transmission energy class of the corresponding terminal stations or accurate transmission power configuration required for the corresponding terminal stations. 40. The reception method of claim 31, wherein the user-specific fields include an RU allocation field indicating at least one RU that is allocated to corresponding terminal stations.