System and method for uplink OFDMA transmission
First Claim
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, wherein the scheduling information indicates a time period for periodic short synchronous signal (SSS) transmission and frequency resource information for the periodic SSS transmission;
periodically sending, to the STAs, an SSS to synchronize the STAs after sending the scheduling information, in accordance with the time period and the frequency resource information, wherein a number of orthogonal frequency division-multiple (OFDM) symbols occupied by the SSS is smaller than a number of OFDM symbols occupied by the scheduling information; and
receiving, from the STAs, information of a UL transmission.
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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.
28 Citations
20 Claims
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1. A method for uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the method comprising:
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sending, by an access point (AP) to a plurality of stations (STAs), scheduling information for periodic UL transmission, wherein the scheduling information indicates a time period for periodic short synchronous signal (SSS) transmission and frequency resource information for the periodic SSS transmission; periodically sending, to the STAs, an SSS to synchronize the STAs after sending the scheduling information, in accordance with the time period and the frequency resource information, wherein a number of orthogonal frequency division-multiple (OFDM) symbols occupied by the SSS is smaller than a number of OFDM symbols occupied by the scheduling information; and receiving, from the STAs, information of a UL transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An access point (AP) supporting uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the AP comprising:
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a non-transitory computer readable storage medium storing programming; and at least one processor coupled to the non-transitory computer readable storage medium, being configured to execute the programming to; send to a plurality of stations (STAs), scheduling information for periodic UL transmission, wherein the scheduling information indicates a time period for periodic short synchronous signal (SSS) transmission and frequency resource information for the periodic SSS transmission; periodically send, to the STAs, an SSS to synchronize the STAs after sending the scheduling information, in accordance with the time period and the frequency resource information, wherein a number of orthogonal frequency division-multiple (OFDM) symbols occupied by the SSS is smaller than a number of OFDM symbols occupied by the scheduling information; and receive, from the STAs, information of a UL transmission. - View Dependent Claims (12)
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13. A method for uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the method comprising:
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receiving, by a station from an access point (AP), scheduling information for periodic UL transmission, wherein the scheduling information indicates a time period for periodic short synchronous signal (SSS) transmission and frequency resource information for the periodic SSS transmission; periodically receiving, from the AP, an SSS in accordance with the time period and the frequency resource information after receiving the scheduling information, wherein a number of orthogonal frequency division-multiple (OFDM) symbols occupied by the SSS is smaller than a number of OFDM symbols occupied by the scheduling information; waiting for a time short interframe space (SIFS); and sending, to the AP, information of a UL transmission in response to receiving the SSS. - View Dependent Claims (14, 15, 16)
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17. A station (STA) supporting uplink (UL) orthogonal frequency division-multiple access (OFDMA) transmission, the STA comprising:
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a non-transitory computer readable storage medium storing programming; and at least one processor coupled to the non-transitory computer readable storage medium, being configured to execute the programming to; receive, from an access point (AP), scheduling information for periodic UL transmission, wherein the scheduling information indicates a time period for periodic short synchronous signal (SSS) transmission and frequency resource information for the periodic SSS transmission; periodically receive, from the AP, an SSS in accordance with the time period and the frequency resource information after receiving the scheduling information, wherein a number of orthogonal frequency division-multiple (OFDM) symbols occupied by the SSS is smaller than a number of OFDM symbols occupied by the scheduling information; wait for a time short interframe space (SIFS); and send, to the AP, information of a UL transmission in response to receiving the SSS. - View Dependent Claims (18, 19, 20)
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Specification