Communication device, control method, and program

Abstract

This method provides a way to achieve both flexible MCS signaling and MCS signaling that differs for each service station. [Solution] The communication device communicates wireless frames. Its preamble includes a U-SIG as a first signal field and a second signal field. The second signal field includes information that identifies the number of streams for each communication device participating in MU-MIMO communication, and information that identifies the MCS to be used for each stream corresponding to that number of streams. Storing specific information as the information that identifies the MCS indicates that different MCS are specified for the first stream and the second stream directed to a particular communication device.

Claims

1. A communication device, It has communication means for communicating wireless frames compliant with the IEEE 802.11 standard series, The aforementioned wireless frame is a wireless frame that performs MU-MIMO (Multiple User, Multiple Input, Multiple Output) communication. The preamble of the aforementioned wireless frame includes a U-SIG (Universal Signal Field) as the first signal field and a second signal field. The second signal field includes information that identifies the number of streams for each communication device participating in the MU-MIMO communication, and information that identifies the MCS (Modulation and Coding Scheme) to be used for each stream corresponding to the number of streams, A communication device characterized in that storing specific information as information that identifies the aforementioned MCS indicates that different MCSs are used for the first stream and the second stream directed to a specific communication device.

2. The communication device according to claim 1, characterized in that the second signal field is configured to specify an MCS that has a modulation scheme of QPSK (Quadraturation Phase-Shift Keying) and an coding rate of 2 / 3 as information that identifies the MCS.

3. The communication device according to claim 2, characterized in that the information identifying the MCS is stored in a 5-bit MCS field and a field that identifies whether or not data communication uses UEQM (Unequal Modulation).

4. The communication device according to claim 1, characterized in that the value of the PHY Version Identifier field of the U-SIG of the wireless frame is one or more.

5. The communication means further communicates a second wireless frame that is of a different type from the wireless frame and performs MU-MIMO communication. The preamble of the second wireless frame includes a U-SIG (Universal Signal Field) as the third signal field and an EHT-SIG (Extremely High Throughput Signal Field) as the fourth signal field. The communication device according to claim 3, wherein the value of the PHY Version Identifier field in the U-SIG, which is the third signal field, is 0, and the EHT-SIG, which is the fourth signal field, contains information that identifies the number of streams for each communication device participating in the MU-MIMO communication and information that identifies the MCS (Modulation and Coding Scheme) to be used for all streams directed to a particular communication device.

6. The communication device according to claim 1, characterized in that the second signal field is an Ultra High Reliability Signal Field (UHR-SIG).

7. The communication device is a communication device that functions as an access point, and the communication means transmits the MU-MIMO communication wireless frame to a plurality of other stations, as described in any one of claims 1 to 6.

8. The communication device is a communication device that functions as a station, and the communication means is characterized in that it receives the wireless frame that performs the MU-MIMO communication transmitted by the access point, as described in any one of claims 1 to 6.

9. The communication device according to claim 8, characterized in that it identifies the number of data communication streams destined for the communication device and the MCS for each stream from the preamble of the received wireless frame, and decodes the data using the identified number of streams and the MCS.

10. It has communication means for communicating wireless frames compliant with the IEEE (Institute of Electrical and Electronics Engineers) 802.11 standard series, The wireless frame is a wireless frame that performs MU-MIMO (Multiple User Multiple Input Multiple Output) communication, and the preamble of the wireless frame includes a U-SIG (Universal Signal Field) as a first signal field and a second signal field, wherein the second signal field includes information that identifies the number of streams for each communication device participating in the MU-MIMO communication, first information that identifies the MCS (Modulation and Coding Scheme) that serves as the UEQM reference, a 1-bit second piece of information indicating that UEQM (UnEqual Modulation) is used, and third information that indicates a UEQM pattern used in combination with the first information to identify the MCS of each stream.

11. The communication device according to claim 10, wherein the first information, the second information, and the third information are included in a 22-bit user field constituting a second signal field, and the 22-bit user field containing the first information, the second information, and the third information does not include a subfield for explicitly transmitting the encoding scheme, and the inclusion of the second information implicitly transmits that the encoding scheme is LDPC.

12. A communication means for communicating wireless frames compliant with the IEEE (Institute of Electrical and Electronics Engineers) 802.11 standard series, The system includes an interpretation means for interpreting the wireless frame, The interpretation means is characterized in that it interprets the communication parameters to be used for reception processing as different when an ELR frame with 0 specified in the MCS subfield is received by the communication means and when a non-ELR format MU PPDU of type 1 with 0 specified in the MCS subfield is received.

13. The interpretation means interprets that the communication parameters to be used for receiving the data section are that the modulation scheme is BPSK (Binary Phase-Shift Keying) and the coding rate is 1 / 2, and that the data section needs to be decoded considering that the same content is replicated in the frequency domain. The communication device according to claim 12, wherein, when 0 is specified in the MCS subfield of the first type MU PPDU, the interpretation means interprets that the communication parameters to be used for receiving the data section are such that the modulation scheme is BPSK (Binary Phase-Shift Keying) and the coding rate is 1 / 2, but the fact that 0 is specified in the MCS subfield of the first type MU PPDU does not mean that it is necessary to decode the data section in the replicated data section, taking into account that the same content is replicated in the frequency domain.

14. A method for controlling a communication device, It has a communication process that communicates wireless frames compliant with the IEEE 802.11 standard series, The aforementioned wireless frame is a wireless frame that performs MU-MIMO (Multiple User, Multiple Input, Multiple Output) communication. The preamble of the aforementioned wireless frame includes a U-SIG (Universal Signal Field) as the first signal field and a second signal field. The second signal field includes information that identifies the number of streams for each communication device participating in the MU-MIMO communication, and information that identifies the MCS (Modulation and Coding Scheme) to be used for each stream corresponding to the number of streams, A control method characterized in that storing specific information as information that identifies the MCS indicates that different MCS are specified for the first stream and the second stream directed to a specific communication device.

15. A program for causing a computer to execute the control method of the communication device described in claim 14.

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