Airframe timestamping technique for point-to-point radio links

A method comprising:

• generating, by a first transceiver, a first airframe to be sent to a second transceiver over a wireless link of a network, the first airframe including a first time indication indicating a first time TS1 that the first airframe is to be transmitted by the first transceiver, the first transceiver and the second transceiver including a first and second counters, respectively;
• transmitting the first airframe to the second transceiver;
• receiving a respond airframe from the second transceiver, the respond airframe including within the respond airframe a third time indication indicating a third time TS3 that the respond airframe is to be transmitted to the first transceiver;
• determining a fourth time indication indicating a fourth time TS4 that the respond airframe was received;
• receiving, from the second transceiver, a second time indication indicating a second time TS2 that the first airframe was received by the second transceiver;
• calculating, by the first transceiver, a counter offset using the first time, second time, third time, and fourth time as follows:
• counter
• ⁢
• offset
• =
• (
• TS
• ⁢
• 1
• +
• TS
• ⁢
• 4
• -
• TS
• ⁢
• 3
• -
• TS
• ⁢
• 2
• )
• 2
• ;
• calculating, by the first transceiver, a phase offset based on the counter offset, the calculating including:
• determining asymmetry (ASY) in the wireless link, the asymmetry (ASY) in the wireless link comprising asymmetry on a round trip radio link path asymmetry corresponding to different modulations for radio ingress and egress based on adaptive coding modulation (ACM) associated with one or more of the first airframe or the response airframe, and
• applying the following:
• phase
• ⁢
• offset
• =
• (
• TS
• ⁢
• 1
• +
• TS
• ⁢
• 4
• -
• TS
• ⁢
• 3
• -
• TS
• ⁢
• 2
• )
• 2
• ±
• Asy
• 2
• ;
• and
• correcting, by the first transceiver, a phase of the first transceiver based on the calculated phase offset, wherein the calculated phase offset is a result at a physical layer and is caused to be made available to higher layers.

A system comprising:

• a first transceiver including memory and a processor, the first transceiver configured to:
• receive a first airframe from a second transceiver over a wireless link of a network, the first airframe including a first time indication indicating a first time TS1 that the first airframe was transmitted to the first transceiver, the first transceiver and the second transceiver including a first and second counters, respectively;
• timestamp a second time indication indicating a second time TS2 that the first airframe was received;
• generate a respond airframe and including within the respond airframe a third time indication indicating a third time TS3 that the respond airframe is to be transmitted to the second transceiver;
• transmit the respond airframe to the second transceiver;
• receive, from the second transceiver, a fourth time indication indicating a fourth time TS4;
• calculate a counter offset using the first time, second time, third time, and fourth time as follows:
• counter
• ⁢
• offset
• =
• (
• TS
• ⁢
• 1
• +
• TS
• ⁢
• 4
• -
• TS
• ⁢
• 3
• -
• TS
• ⁢
• 2
• )
• 2
• ;
• calculate a phase offset based on the counter offset, the calculating including:
• determining asymmetry (ASY) in the wireless link, the asymmetry (ASY) in the wireless link comprising asymmetry on a round trip radio link path asymmetry corresponding to different modulations for radio ingress and egress based on adaptive coding modulation (ACM) associated with one or more of the first airframe or the response airframe, and
• applying the following:
• phase
• ⁢
• offset
• =
• (
• TS
• ⁢
• 1
• +
• TS
• ⁢
• 4
• -
• TS
• ⁢
• 3
• -
• TS
• ⁢
• 2
• )
• 2
• ±
• Asy
• 2
• ;
• and
• correct a phase of the first transceiver based on the calculated phase offset, wherein the calculated phase offset is a result at a physical layer and is caused to be made available to higher layers.

A system comprising:

• a first transceiver including memory and a processor, the first transceiver configured to:
• generate a first airframe to be sent to a second transceiver over a wireless link of a network, the first airframe including a first time indication indicating a first time TS1 that the first airframe is to be transmitted by the first transceiver, the first transceiver and the second transceiver including a first and second counters, respectively;
• transmit the first airframe to the second transceiver;
• receive a respond airframe from the second transceiver, the respond airframe including within the respond airframe a third time indication indicating a third time TS3 that the respond airframe is to be transmitted to the first transceiver;
• determine a fourth time indication indicating a fourth time TS4 that the respond airframe was received;
• receive, from the second transceiver, a second time indication indicating a second time TS2 that the first airframe was received by the second transceiver;
• calculate a counter offset using the first time, second time, third time, and fourth time as follows:
• counter
• ⁢
• offset
• =
• (
• TS
• ⁢
• 1
• +
• TS
• ⁢
• 4
• -
• TS
• ⁢
• 3
• -
• TS
• ⁢
• 2
• )
• 2
• ;
• calculate a phase offset based on the counter offset, the calculating including:
• determining asymmetry (ASY) in the wireless link, the asymmetry (ASY) in the wireless link comprising asymmetry on a round trip radio link path asymmetry corresponding to different modulations for radio ingress and egress based on adaptive coding modulation (ACM) associated with one or more of the first airframe or the response airframe, and
• applying the following:
• phase
• ⁢
• offset
• =
• (
• T
• ⁢
• S
• ⁢
• 1
• +
• T
• ⁢
• S
• ⁢
• 4
• -
• T
• ⁢
• S
• ⁢
• 3
• -
• T
• ⁢
• S
• ⁢
• 2
• )
• 2
• ±
• A
• ⁢
• s
• ⁢
• y
• 2
• ;
• and
• correct a phase of the first transceiver based on the calculated phase offset, wherein the calculated phase offset is a result at a physical layer and is caused to be made available to higher layers.