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Short CTS

Short CTS. Authors:. Date: 2012-05-14. Short Ack. STF. LTF1. SIG. 22 bits (1MHz) 34 bits (  2MHz). It is natural to use the same short Ack format [1] for short CTS also. Short CTS indication use a reserved MCS value different from the short Ack indication CTS ID Bandwidth

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Short CTS

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  1. Short CTS Authors: Date: 2012-05-14 Yong Liu, Marvell, et. al.

  2. Yong Liu, Marvell, et. al.

  3. Yong Liu, Marvell, et. al.

  4. Short Ack STF LTF1 SIG 22 bits (1MHz) 34 bits (2MHz) • It is natural to use the same short Ack format [1] for short CTS also Yong Liu, Marvell, et. al.

  5. Short CTS indication • use a reserved MCS value different from the short Ack indication • CTS ID • Bandwidth • indicate available bandwidth at receiver side (see next slide) • Duration • if time unit = 40us, 10 bits can indicate 40.96ms • CRC – 4 bits • Tail – 6 bits (TBD) • other subfields TBD Short CTS SIG Yong Liu, Marvell, et. al.

  6. 11ac bandwidth negotiation scheme can be used in 11ah also: • RTS indicates the available bandwidth at the transmitter side • CTS indicates the available bandwidth at the receiver side (within the bandwidth indicated by RTS) • Subsequent transmissions within the TXOP cannot occupy a bandwidth wider than that indicated by CTS Bandwidth subfield Yong Liu, Marvell, et. al.

  7. Bit calculation • 1MHz: 36 bits – MCS (4 bits) – bandwidth (2-3 bits) – duration (9-10 bits) – CRC and tail (10 bits) = 9 – 11 bits •  2MHz: 48 bits – MCS (4 bits) – bandwidth (2-3 bits) – duration (9-10 bits) – CRC and tail (10 bits) = 21 – 23 bits • Is it ok to have a shorter CTS ID than Ack ID? • Short CTS is sent less frequent than short Ack => the possibility of false CTS is extremely low • A false short CTS may potentially cause some interference to the medium, but its impact is much less severe than a false short Ack CTS ID (1) Yong Liu, Marvell, et. al.

  8. RTS/CTS • CTS ID: Partial FCS and scramble seed information from the received RTS (same as Ack ID but with fewer bits) • CTS-to-Self • CTS ID: partial TA of the transmitter CTS ID (2) Yong Liu, Marvell, et. al.

  9. Do you support to define a short CTS format as following with SIG field design TBD Straw poll STF LTF1 SIG Yong Liu, Marvell, et. al.

  10. [1] 11-12-0324-02-00ah-short-ack Reference Yong Liu, Marvell, et. al.

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