Transmission apparatus and transmission method
View Patent ↗An transmission apparatus of the present disclosure comprises a transmission signal generator that generates a transmission signal including a legacy preamble, a non-legacy preamble and a data field and a transmitter that transmits the transmission signal. The non-legacy preamble comprises a first and a second signal fields, the second signal field comprising a first channel field and, when the transmission signal occupies more than one subband channel, the second signal field further comprising a second channel field. Each of the first and the second channel fields comprises a user-specific field that includes a plurality of user fields, each carrying per-user allocation information for a terminal station. The plurality of user fields are split equitably between the first and the second channel fields when a full bandwidth that covers a first and a second subband channels is allocated for multi-user MIMO transmission.
1. A communication apparatus comprising:
a transmitter, which, in operation, transmits, to a single receiving communication apparatus, a partial bandwidth transmission packet that contains a preamble and a data field, wherein the preamble includes resource unit (RU) allocation information indicating one of a plurality of RU arrangements and includes a plurality of user fields, wherein
the one of the plurality of RU arrangements indicates a plurality of RUs which respectively correspond to the plurality of user fields, and
one RU of the plurality of RUs is an RU allocated to the single receiving communication apparatus and other RU(s) of the plurality of RUs are unallocated RU(s); and
controller circuitry, which is coupled to the transmitter and which, in operation, sets a dummy association identifier (AID) to a user field corresponding to the unallocated RU,
wherein
the preamble is transmitted over a 20 MHz bandwidth, and the data field is transmitted within the allocated RU that is a 106-tone RU which is a bandwidth less than 20 MHz.
2. The communication apparatus according to claim 1 ,
wherein the RU allocation information is used for a multi-user multiple input multiple output (MIMO) transmission.
3. The communication apparatus according to claim 1 ,
wherein the RU allocation information is used for an orthogonal frequency division multiplexing (OFDM) transmission.
4. The communication apparatus according to claim 1 ,
wherein the plurality of RUs include more than one unallocated RU, and the dummy AID is set to all of the user fields corresponding to the unallocated RUs.
5. The communication apparatus according to claim 1 ,
wherein the one of the plurality of RU arrangements is an RU arrangement indicating the smallest number of the plurality of RUs among the plurality of RU arrangements.
6. A communication method comprising:
transmitting, to a single receiving communication apparatus, a partial bandwidth transmission packet that contains a preamble and a data field, wherein the preamble includes resource unit (RU) allocation information indicating one of a plurality of RU arrangements and includes a plurality of user fields, wherein
the one of the plurality of RU arrangements indicates a plurality of RUs which respectively correspond to the plurality of user fields, and
one RU of the plurality of RUs is an RU allocated to the single receiving communication apparatus and other RU(s) of the plurality of RUs are unallocated RU(s); and
setting a dummy association identifier (AID) to a user field corresponding to the unallocated RU,
wherein
the preamble is transmitted over a 20 MHz bandwidth, and the data field is transmitted within the allocated RU that is a 106-tone RU which is a bandwidth less than 20 MHz.
7. The communication method according to claim 6 ,
wherein the plurality of RUs include more than one unallocated RU, and the dummy AID is set to all of the user fields corresponding to the unallocated RUs.
8. The communication method according to claim 6 ,
wherein the one of the plurality of RU arrangements is an RU arrangement indicating the smallest number of the plurality of RUs among the plurality of RU arrangements.
9. The communication method according to claim 6 ,
wherein the RU allocation information is used for a multi-user multiple input multiple output (MIMO) transmission.
10. The communication method according to claim 6 ,
wherein the RU allocation information is used for an orthogonal frequency division multiplexing (OFDM) transmission.