System and Method for Uplink OFDMA Transmission

• US 20150201432A1
• Filed: 01/13/2015
• Published: 07/16/2015
• Est. Priority Date: 01/15/2014
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Rong, Zhigang, Yang, Yunsong, Kwon, Young-Hoon
• Granted Patent: US 10,103,852 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

Embodiments are provided for implementing efficient uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission in wireless systems, such as in WiFi networks. An embodiment method includes sending, by an access point (AP) to a plurality of stations (STAs), scheduling information for periodic UL transmission, and sending, to the STAs, a short synchronous signal (SSS) in accordance with the scheduling information for periodic UL transmission. The method further includes receiving, from the STAs, a corresponding UL transmission in response to receiving the SSS. The UL transmission is sent by each of the plurality of the STAs at about a same time. The STAs wait for a time short interframe space (SIFS) after receiving the SSS, before sending, to the AP, the UL transmission.

Claims

1. A method for uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the method comprising:

sending, by an access point (AP) to a plurality of stations (STAs), scheduling information for periodic UL transmission;

sending, to the STAs, a short synchronous signal (SSS) in accordance with the scheduling information for periodic UL transmission; and

receiving, from the STAs, a corresponding UL transmission in response to receiving the SSS, wherein the UL transmission is sent by each of the plurality of the STAs at about a same time.

2. The method of claim 1, wherein the SSS is a signal occupying one or a small number of OFDM symbols sufficient for signaling the STAs.

3. The method of claim 1, wherein the SSS is a signal in a form of a determined designed sequence.

4. The method of claim 1, wherein the scheduling information indicates a time period for sending the SSS recurrently to the STAs and receiving in response the corresponding UL transmission from each of the plurality of the STAs.

5. The method of claim 4 further comprising:

sending, to the STAs, a second SSS separated by about the time period from the SSS; and

receiving, from each one of the plurality of the STAs, a second corresponding UL transmission in response to receiving the second SSS, wherein the second UL transmission is sent by each of the plurality of the STAs at about a same time.

6. The method of claim 1, wherein the UL transmission is received from each one of the plurality of the STAs after at least a time short interframe space (SIFS) from sending the SSS.

7. The method of claim 1 further comprising:

sending, from the AP to a plurality of second STAs, second scheduling information for periodic UL transmission;

sending, to the second STAs, a second SSS in accordance with the second scheduling information; and

receiving, from each one of the plurality of the second STAs, a corresponding UL transmission in response to receiving the second SSS, wherein the second UL transmission is sent by each of the plurality of the second STAs at about a same time.

8. The method of claim 7, wherein the second SSS is sent to the second STAs at a different timing from sending the SSS to the STAs.

9. The method of claim 7, wherein the second scheduling information indicates a second time period for sending the second SSS recurrently to the second STAs and receiving in response the corresponding UL transmission from each of the plurality of the second STAs.

10. The method of claim 1, wherein the scheduling information comprises frequency resource information for sending the SSS to the STAs.

11. The method of claim 1, wherein the SSS is sent to the plurality of STAs on a same frequency resource for UL transmission for one of the STAs.

12. The method of claim 1, wherein the SSS is sent to each one of the STAs on a corresponding frequency resource for UL transmission for the each one of the STAs.

13. The method of claim 1, wherein the SSS comprises power control information for controlling transmission power of the UL transmission from the STAs.

14. An access point (AP) supporting uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the AP comprising:

at least one processor; and

a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions to;

send to a plurality of stations (STAs), scheduling information for periodic UL transmission;

send, to the STAs, a short synchronous signal (SSS) in accordance with the scheduling information for periodic UL transmission; and

receive, from the STAs, a corresponding UL transmission in response to receiving the SSS, wherein the UL transmission is sent by each of the plurality of the STAs at about a same time.

15. The AP of claim 14, wherein the scheduling information indicates a time period for sending the SSS recurrently to the STAs and receiving in response the corresponding UL transmission from each of the plurality of the STAs.

16. The AP of claim 14, wherein the UL transmission is a WiFi signal.

17. A method for uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the method comprising:

receiving, by a station from an access point (AP), scheduling information for periodic UL transmission;

receiving, from the AP, a short synchronous signal (SSS) in accordance with the scheduling information for periodic UL transmission;

waiting for a time short interframe space (SIFS); and

sending, to the AP, an UL transmission in response to receiving the SSS.

18. The method of claim 17, wherein the scheduling information indicates a time period for transmitting the SSS recurrently from the AP and sending in response the UL transmission from the STA.

19. The method of claim 18 further comprising:

receiving, from the AP, a second SSS separated by about the time period from the SSS; and

sending, to the AP, a second UL transmission in response to receiving the second SSS.

20. The method of claim 17, wherein the SSS is in a form of a determined designed sequence.

21. The method of claim 17, wherein the scheduling information indicates a frequency resource, and wherein the SSS is received by the STA on the frequency resource.

22. The method of claim 17, wherein the SSS comprises power control information, and wherein the UL transmission is sent by the STA using a transmission power in accordance with the power control information.

23. A station (STA) supporting uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the STA comprising:

at least one processor; and

a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions to;

receive, from an access point (AP), scheduling information for periodic UL transmission;

receive, from the AP, a short synchronous signal (SSS) in accordance with the scheduling information for periodic UL transmission;

wait for a time short interframe space (SIFS); and

send, to the AP, an UL transmission in response to receiving the SSS.

24. The STA of claim 23, wherein the scheduling information indicates a time period for transmitting the SSS recurrently from the AP and sending in response the UL transmission from the STA.