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US 9,426,630 B2Granted
Method for transmitting and receiving multicast/broadcast frame in wireless local area network and apparatus for the same
AssigneeLG Electronics Inc.
InventorYong Ho Seok
Life of this patent
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Abstract
A method for transmitting multicast frames by a transmitter in a wireless local area network is provided. The method includes: receiving a first directed multicast service (DMS) request frame from a first receiver; receiving a second DMS frame from a second receiver; transmitting a DMS response frame to the first receiver and the second receiver; transmitting a VHT-SIG A field; and transmitting each data unit to the first receiver and the second receiver by a multi user-multiple input multiple output transmission. The first and second DMS request frames are transmitted for requesting DMS. The DMS response frame includes a response type indicating whether the requested DMS is accepted as the DMS for a multi user transmission.
Claims8
A method for transmitting multicast frames by a transmitter in a wireless local area network, the method comprising:
- receiving, by the transmitter, a first directed multicast service (DMS) request frame from a first receiver, the first DMS request frame including a request type field for a request of a unicast transmission of a multicast frame;
- receiving, by the transmitter, a second DMS request frame from a second receiver, the second DMS request frame including the request type field for the request of the unicast transmission of the multicast frame;
- transmitting, by the transmitter, a DMS response frame to the first receiver and the second receiver, the DMS response frame including a response type field, a group identifier field, and a TCLAS element field, the response type field indicating whether the request of the unicast transmission of the multicast frame is accepted for the first receiver and the second receiver, the group identifier field including a group identifier indicating each of the first receiver and the second receiver receiving the multicast frame by the unicast transmission, and the TCLAS element field including a multicast address for the multicast frame corresponding to the group identifier;
- and
- performing, by the transmitter, the unicast transmission for a physical layer convergence procedure (PLCP) protocol data unit (PPDU) carrying the multicast frame based on a multiple user (MU)-multiple input multiple output (MIMO) to each of the first receiver and the second receiver, the PPDU including a VHT-SIG A field including the group identifier,
- wherein the first receiver determines whether the PPDU is the multicast frame transmitted by the unicast transmission based on the group identifier included in the VHT-SIG A field, and
- wherein the first receiver determines the multicast address based on the group identifier included in the VHT-SIG A field and the multicast address corresponding to the group identifier included in the TCLAS element field when the first receiver determines that the PPDU is the multicast frame transmitted by the unicast transmission.
4 more elements
An apparatus for transmitting multicast frames, the apparatus comprising:
- a transceiver configured to transmit or receive radio signals;
- and
- a processor operatively coupled to the transceiver and configured to:
- receive a first directed multicast service (DMS) request frame from a first receiver, the first DMS request frame including a request type field for a request of a unicast transmission of a multicast frame;
- receive a second DMS request frame from a second receiver, the second DMS request frame including the request type field for the request of the unicast transmission of the multicast frame;
- transmit a DMS response frame to the first receiver and the second receiver, the DMS response frame including a response type field, a group identifier field, and a TCLAS element field, the response type field indicating whether the request of the unicast transmission of the multicast frame is accepted for the first receiver and the second receiver, the group identifier field including a group identifier indicating each of the first receiver and the second receiver receiving the multicast frame by the unicast transmission, and the TCLAS element field including a multicast address for the multicast frame corresponding to the group identifier;
- and
- perform the unicast transmission for a physical layer convergence procedure (PLCP) protocol data unit (PPDU) carrying the multicast frame based on a multiple user (MU)-Multiple input multiple output (MIMO) to each of the first receiver and the second receiver, the PPDU including a VHT-SIG A field including the group identifier,
- wherein the first receiver determines whether the PPDU is the multicast frame transmitted by the unicast transmission based on the group identifier included in the VHT-SIG A field, and
- wherein the first receiver determines the multicast address based on the group identifier included in the VHT-SIG A field and the multicast address corresponding to the group identifier included in the TCLAS element field when the first receiver determines that the PPDU is the multicast frame transmitted by the unicast transmission.
7 more elements
Dependencies are inferred from the claim text.