Packet detection across sub-bands
Aspects relate to outputting a training field signal and/or obtaining a training field signal over multiple radio frequency (RF) sub-bands. For example, a carrier bandwidth used by a first apparatus to transmit packets may include several RF sub-bands. The first apparatus may use two or more of these RF sub-bands to transmit a training field signal. In some examples, the first apparatus may repeat the same training field signal over multiple RF sub-bands. In some examples, the second apparatus may combine the training field signal sent over the multiple RF sub-bands.
1. A first apparatus for communication, comprising:
an interface; and
a processing system configured to:
obtain, via the interface, training field information associated with a packet from a second apparatus over at least two radio frequency sub-bands of a plurality of radio frequency sub-bands, wherein the training field information comprises a training field sequence that is duplicated over each of the at least two radio frequency sub-bands,
obtain, via the interface, payload information associated with the packet over the plurality of radio frequency sub-bands, wherein the payload information comprises payload data that is duplicated over each of the plurality of radio frequency sub-bands,
combine the payload data duplicated over each of the plurality of radio frequency sub-bands to provide combined payload data, and
output the combined payload data via the interface.
2. The first apparatus of claim 1 , wherein each radio frequency sub-band of the plurality of radio frequency sub-bands comprises a 20 MHz bandwidth.
3. The first apparatus of claim 1 , wherein the at least two radio frequency sub-bands of the plurality of radio frequency sub-bands comprise two radio frequency sub-bands, four radio frequency sub-bands, eight radio frequency sub-bands, or sixteen radio frequency sub-bands.
4. The first apparatus of claim 1 , wherein the at least two radio frequency sub-bands of the plurality of radio frequency sub-bands comprise fewer radio frequency sub-bands than the plurality of radio frequency sub-bands.
5. The first apparatus of claim 1 , wherein the processing system is further configured to:
detect the packet based on a threshold associated with how many radio frequency sub-bands are included in the at least two radio frequency sub-bands.
6. The first apparatus of claim 1 , wherein the processing system is further configured to:
use a first threshold for detecting the packet over two radio frequency sub-bands of the plurality of radio frequency sub-bands;
use a second threshold different from the first threshold for detecting the packet over four radio frequency sub-bands of the plurality of radio frequency sub-bands;
use a third threshold different from the first threshold for detecting the packet over eight radio frequency sub-bands of the plurality of radio frequency sub-bands; and
use a fourth threshold different from the first threshold for detecting the packet over sixteen radio frequency sub-bands of the plurality of radio frequency sub-bands.
7. The first apparatus of claim 1 , wherein:
the processing system is further configured to output the packet independent of very high throughput (VHT) training field information or VHT signal information; and
the packet is a request-to-send packet, a clear-to-send packet, or an acknowledgement packet.
8. The first apparatus of claim 1 , wherein the training field information comprises legacy short training field information and a legacy long training field information.
9. The first apparatus of claim 8 , wherein the processing system is further configured to:
combine the legacy short training field information duplicated over the at least two radio frequency sub-bands to obtain automatic gain control information;
decode the legacy long training field information based on the automatic gain control information to obtain synchronization information; and
obtain the payload data based on the synchronization information.
10. The first apparatus of claim 1 , further comprising:
a receiver configured to receive the training field information and the payload information,
wherein the first apparatus is configured as a wireless node.
11. A first apparatus for communication, comprising:
an interface; and
a processing system configured to:
obtain, via the interface, a signal indicative of a protocol data unit bandwidth used by a second apparatus,
select a set of radio frequency sub-bands of a plurality of radio frequency sub-bands, including a first quantity of radio frequency sub-bands and a second quantity of radio frequency sub-bands, based on the protocol data unit bandwidth used by the second apparatus,
detect signals on the set of radio frequency sub-bands,
obtain, via the interface, first training field information associated with a first packet detected over the first quantity of radio frequency sub-bands of the plurality of radio frequency sub-bands using a first packet detection threshold, and
obtain, via the interface, second training field information associated with a second packet detected over the second quantity of radio frequency sub-bands of the plurality of radio frequency sub-bands using a second packet detection threshold, wherein the second quantity of radio frequency sub-bands is different from the first quantity of radio frequency sub-bands, and wherein the second packet detection threshold is different from the first packet detection threshold.
12. The first apparatus of claim 11 , wherein the processing system is further configured to:
obtain, via the interface, third training field information associated with a third packet detected over a third quantity of radio frequency sub-bands of the plurality of radio frequency sub-bands using a third packet detection threshold, wherein the third quantity of radio frequency sub-bands is different from the first quantity of radio frequency sub-bands, and wherein the third packet detection threshold is different from the third-first packet detection threshold.
13. The first apparatus of claim 12 , wherein the processing system is further configured to:
obtain, via the interface, fourth training field information associated with a fourth packet detected over a fourth quantity of radio frequency sub-bands of the plurality of radio frequency sub-bands using a fourth packet detection threshold, wherein the fourth quantity of radio frequency sub-bands is different from the first quantity of radio frequency sub-bands, and wherein the fourth packet detection threshold is different from the third-first packet detection threshold.
14. The first apparatus of claim 11 , wherein the processing system is configured to:
perform signal detection on each radio frequency sub-band of the plurality of radio frequency sub-bands to realize a packet bandwidth used by the second apparatus; and
detect training field signals over the packet bandwidth used by the second apparatus.
15. The first apparatus of claim 11 , further comprising:
a receiver configured to receive the first training field information and the second training field information,
wherein the first apparatus is configured as a wireless node.
16. A first apparatus for communication, comprising:
an interface; and
a processing system configured to:
output, via the interface for transmission to a second apparatus, training field information of a packet over at least two radio frequency sub-bands of a plurality of radio frequency sub-bands, and
output, via the interface for transmission to the second apparatus, payload information associated with the packet over the plurality of radio frequency sub-bands, wherein the payload information is duplicated over each of the plurality of radio frequency sub-bands.
17. The first apparatus of claim 16 , wherein each radio frequency sub-band of the plurality of radio frequency sub-bands comprises a 20 MHz bandwidth.
18. The first apparatus of claim 16 , wherein:
the plurality of radio frequency sub-bands comprises a 320 MHz bandwidth; and
the at least two radio frequency sub-bands of the plurality of radio frequency sub-bands comprises a 40 MHz bandwidth, a 80 MHz bandwidth, a 160 MHz bandwidth, or the 320 MHz bandwidth.
19. The first apparatus of claim 16 , wherein at least one of:
the training field information comprises legacy short training field information and legacy long training field information;
the processing system is further configured to output the packet independent of very high throughput (VHT) training field information or VHT signal information; or
the packet is a request-to-send packet, a clear-to-send packet, or an acknowledgement packet.