APPARATUS FOR COLLISION MITIGATION OF MULTICAST TRANSMISSIONS IN WIRELESS NETWORKS
First Claim
1. An apparatus comprising:
- a device for receiving a multicast digital message, the multicast digital message having a format comprising;
a duration field;
a multicast receiver address field;
a multicast transmitter address field; and
bits specifying a destination that is requested to reply to the multicast digital message.
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Accused Products
Abstract
Message formats and apparatus are described that reserve access to a communication medium in a multicast system. A first message, a multicast request-to-send message, includes a duration field having information representing the reserved time for a communication medium, multicast receiver and transmitter address fields, and bits that specifies a destination that is expected to reply to the multicast digital message. The bits that specify a destination can be extended to a plurality of fields that each contain different destination identifiers. Example destination identifiers include association identifiers or media access control addresses. Alternately, the bits that specify a destination can have a first field containing an offset and a second field indicating destinations with respect to the offset. A second message includes a duration field and multicast receiver and transmitter address fields. The second message is used to cancel a data transmission resulting from a multicast request-to-send message.
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Citations
22 Claims
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1. An apparatus comprising:
a device for receiving a multicast digital message, the multicast digital message having a format comprising; a duration field; a multicast receiver address field; a multicast transmitter address field; and bits specifying a destination that is requested to reply to the multicast digital message. - View Dependent Claims (2, 3, 4, 5)
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6. (canceled)
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7. (canceled)
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8. An apparatus comprising:
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a device for receiving a multicast digital message, the digital message having a format comprising; a duration field; a multicast receiver address field; and a multicast transmitter address field; wherein the multicast digital message acts to cancel a previously received multicast request-to-send message, the previously received multicast request-to-send message comprising a field specifying a destination that is expected to respond to the multicast request-to-send message by transmitting a multicast clear-to-send message.
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9. (canceled)
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10. (canceled)
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11. (canceled)
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12. (canceled)
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13. (canceled)
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14. (canceled)
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15. (canceled)
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16. (canceled)
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17. A computer program storage device containing computer instructions which, when executed, enable processing of a multicast digital message, the digital message having a format comprising:
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a duration field; a multicast receiver address field; a multicast transmitter address field; and bits specifying a destination that is requested to reply to the message. - View Dependent Claims (18, 19, 20, 21)
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22. A computer program storage device containing computer instructions which, when executed, enable processing of a multicast digital message, the digital message having a format comprising:
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a duration field comprising information representing a remaining time that a communication medium is reserved; a multicast receiver address field; and
,a multicast transmitter address field; wherein the digital message acts to cancel a previously received multicast request-to-send message, the previously received multicast request-to-send message comprising a field specifying a destination that is expected to respond to the multicast request-to-send message by transmitting a multicast clear-to-send message.
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Specification