Early link detection based adaptive selection of receive parameters
View Patent ↗An example method may include receiving a pre-payload portion of a packet at a receiver node. A link associated with a sender node of the packet may be identified based on the pre-payload portion. One or more baseband receive parameters associated with the identified link may be selected and loaded at the receiver node. A payload of the packet may be received at the receiver node using the selected baseband receive parameters. Another example method may include detecting arrival of a packet at a receiver node by detecting OTA energy using at least one of multiple antenna sectors. One or more RF receive parameters of the receiver node may be selected based on information included in or determined from the pre-payload portion of the packet. A payload of the packet may be received at the receiver node using the selected RF receive parameters of the receiver node.
1. A method, comprising:
generating an historic signature of each of one or more links, including:
extracting over time channel state information (CSI) of each of the one or more links from wireless user data packets sent to a receiver node over each of the one or more links;
clustering the extracted CSI into groups for each of the one or more links based on one or more source addresses included in the wireless user data packets, each of the one or more source addresses identifying a corresponding one of one or more sender nodes; and
deriving the historic signature of each of the one or more links from the clustered extracted CSI groupings of each of the one or more links;
receiving a pre-payload portion of a wireless user data packet at the receiver node;
identifying a link associated with a sender node of the wireless user data packet based on the pre-payload portion before decoding a MAC header of the wireless user data packet, including:
determining a current signature of the identified link; and
correlating the current signature against the historic signature of each of the one or more links;
selecting and loading one or more baseband receive parameters associated with the identified link at the receiver node; and
receiving a payload of the wireless user data packet at the receiver node using the one or more baseband receive parameters.
2. The method of claim 1 , wherein loading the one or more baseband receive parameters at the receiver node comprises configuring a baseband circuit of the receiver node with at least one of a specific automatic gain control (AGC) gain and a specific equalizer type.
3. The method of claim 1 , wherein identifying the link based on the pre-payload portion further comprises extracting CSI from the pre-payload portion.
4. The method of claim 1 , further comprising:
determining that a current signature of the identified link has changed and does not correlate to the historic signature of the identified link; and
triggering a security event in response to determining that the current signature of the identified link has changed and does not correlate to the historic signature of the identified link.
5. The method of claim 1 , wherein correlating the current signature against the historic signature of each of the one or more links includes:
calculating a distance metric between the current signature and the historic signature of each of the one or more links; and
selecting a link of the one or more links with a historic signature that is closest to the current signature as the identified link.
6. The method of claim 1 , further comprising loading the one or more historic signatures of the one or more links onto the receiver node, the historic signatures generated by a different device than the receiver node.
7. The method of claim 1 , further comprising, after receiving the payload of the wireless user data packet at the receiver node:
determining that the current signature of the identified link has changed and does not correlate to a historic signature of the identified link; and
triggering a security event in response to determining that the current signature of the identified link has changed and does not correlate to the historic signature of the identified link.
8. The method of claim 7 , wherein triggering the security event comprises disassociating the sender node from the receiver node.
9. The method of claim 1 , wherein receiving the pre-payload portion of the wireless user data packet comprises receiving a legacy-long training field (L-LTF) of the wireless user data packet.
10. A method, comprising:
generating an historic signature of each of one or more links, including:
extracting over time channel state information (CSI) of each of the one or more links from wireless user data packets sent to a receiver node over each of the one or more links;
clustering the extracted CSI into groups for each of the one or more links based on one or more source addresses included in the wireless user data packets, each of the one or more source addresses identifying a corresponding one of one or more sender nodes; and
deriving the historic signature of each of the one or more links from the clustered extracted CSI groupings of each of the one or more links;
receiving a pre-payload portion of a wireless user data packet at the receiver node;
identifying a link associated with a sender node of the wireless user data packet based on the pre-payload portion before decoding a MAC header of the wireless user data packet, including:
determining a current signature of the identified link; and
correlating the current signature against the historic signature of each of the one or more links;
selecting and loading one or more baseband receive parameters associated with the identified link at the receiver node;
selecting one or more radio frequency (RF) receive parameters of the receiver node based on information included in or determined from the pre-payload portion of the wireless user data packet; and
receiving a payload of the wireless user data packet at the receiver node using the one or more baseband receive parameters and the one or more RF receive parameters.
11. The method of claim 10 , wherein loading the one or more baseband receive parameters at the receiver node comprises configuring a baseband circuit of the receiver node with at least one of a specific automatic gain control (AGC) gain and a specific equalizer type.
12. The method of claim 10 , wherein selecting the one or more RF receive parameters of the receiver node comprises at least one of:
selecting a first subset of a plurality of antenna sectors of the receiver node that each has one or more sector-specific metrics that is better than one or more sector-specific metrics of each of a second subset of the plurality of antenna sectors to receive the payload of the wireless user data packet;
selecting an antenna polarization to receive the payload of the wireless user data packet based on one or more metrics included in or determined from the pre-payload portion of the wireless user data packet, the selected antenna polarization having better one or more metrics than an other antenna polarization; and
selecting a receive beamforming pattern to receive the payload of the wireless user data packet according to the sender node of the wireless user data packet identified based on the pre-payload portion of the wireless user data packet.
13. The method of claim 10 , wherein identifying the link based on the pre-payload portion further comprises extracting current CSI from the pre-payload portion, the current signature determined from the current CSI.
14. The method of claim 10 , wherein receiving the pre-payload portion of the wireless user data packet at the receiver node comprises receiving the pre-payload portion of the wireless user data packet at one of an access point (AP) or a wireless station (STA).
15. The method of claim 10 , wherein receiving the pre-payload portion of the wireless user data packet comprises receiving a legacy-long training field (L-LTF) of the wireless user data packet.