Methods and apparatus for packet acquisition in mixed-rate wireless communication networks

1. A method of wireless communication, comprising:

generating, at a first wireless device, a first packet comprising a first preamble decodable by a plurality of devices and a second preamble decodable by only a subset of the plurality of devices, the first preamble comprising a first signal field, and the second preamble comprising a first training field; and

transmitting, by the first wireless device, the first packet concurrently with transmissions of one or more second packets by wireless devices other than the first wireless device, wherein the first packet and the one or more second packets are transmitted over an uplink,

wherein the first signal field indicates a maximum length of a corresponding number of the second packets transmitted by a second wireless device of the wireless devices.

2. The method of claim 1 , further comprising transmitting the first signal field over a channel bandwidth up to a full channel bandwidth size assigned to the first wireless device.

3. The method of claim 1 , further comprising, when the first wireless device is not assigned use of a channel designated as a primary channel, transmitting the first signal field over the channel designated as the primary channel.

4. The method of claim 1 , further comprising transmitting the first signal field over an available channel bandwidth including one or more channels not assigned for use by the first wireless device.

5. The method of claim 1 , wherein:

a length of the first packet is shorter than a length of the corresponding number of second packets, and the second wireless device is assigned to a common zone with the first wireless device.

6. The method of claim 1 , wherein:

a length of the first packet is shorter than a length of the corresponding number of second packets, and the second wireless device is assigned to any zone including a commonly assigned zone with the first wireless device.

7. The method of claim 1 , wherein:

a length of the first packet is shorter than a length of at least one of the one or more second packets transmitted by a second wireless device of the wireless devices; and

the method further comprises refraining from padding the first packet.

8. The method of claim 1 , wherein the second preamble further comprises a second signal field.

9. The method of claim 1 , wherein the second preamble further comprises a full or partial repetition of the first signal field, and a second signal field.

10. An apparatus configured to wirelessly communicate, comprising:

a processor configured to generate a first packet comprising a first preamble decodable by a plurality of devices and a second preamble decodable by only a subset of the plurality of devices, the first preamble comprising a first signal field, and the second preamble comprising a first training field; and

a transmitter configured to transmit the first packet concurrently with transmissions of one or more second packets by wireless devices other than the apparatus, wherein the first packet and the one or more second packets are transmitted over an uplink,

wherein the first signal field indicates a maximum length of a corresponding number of the second packets transmitted by a second wireless device of the wireless devices.

11. The apparatus of claim 10 , wherein the second preamble further comprises a repetition of even or odd tones of the first signal field, and a second signal field.

12. The apparatus of claim 10 , wherein the second preamble further comprises a second signal field and a repetition of the second signal field.

13. The apparatus of claim 10 , wherein the second preamble further comprises a second training field, the second training field being shorter than the first training field.

14. The apparatus of claim 10 , wherein:

a length of the first training field is shorter than a length of at least one training field transmitted by the second wireless device, the second wireless device being assigned to a common zone with the apparatus; and

the processor is further configured to pad the first training field to align a boundary of all training fields transmitted by the second wireless device assigned to the common zone.

15. The apparatus of claim 10 , wherein:

a length of the first training field is shorter than a length of at least one training field transmitted by the second wireless device, the second wireless device being assigned to any zone including a commonly assigned zone with the apparatus; and

the processor is further configured to pad the first training field to align a boundary of all training fields transmitted by the second wireless device being assigned to any zone including the commonly assigned zone.

16. The apparatus of claim 10 , wherein:

a length of the first training field is shorter than a length of at least one training field transmitted by a second wireless device; and

the processor is further configured to refrain from padding the first training field.

17. The apparatus of claim 10 , wherein the second preamble further comprises a second signal field, and a repetition of the second signal field based, at least in part, on one of:

a protection method used for a third signal field of the first packet;

a compression method used for the first training field; and

a prefix of a payload of the first packet.

18. The apparatus of claim 10 , wherein the first signal field comprises an immediate response presence and/or duration indication.

19. The apparatus of claim 10 , wherein the first signal field comprises a transmit power indication.

20. The apparatus of claim 10 , wherein the first signal field comprises a partial time synchronization function (TSF).