Systems and methods for interference alignment in Wi-Fi
First Claim
1. A method in a network component for interference alignment in a wireless local area network (LAN) with an overlapping basic service set (OBSS), the method comprising:
- instructing with the network component a first one of a plurality of access points (APs) in the wireless LAN to broadcast a null data packet (NDP) sounding packet to a plurality of stations when no other AP in the plurality of APs is broadcasting, wherein the NDP sounding packet comprises a plurality of long training field (LTFs), and wherein a total number of LTFs is equal to a total number of transmission streams per each AP;
receiving channel beamforming (BF) information and a signal plus interference to noise ratio (SINR) from each of the plurality of stations, wherein each of the plurality of stations computes the channel BF information and the SINR from sounding packets received from each of the plurality of APs in the wireless LAN;
determining a transmission schedule according to the SINRs and the channel BF information;
grouping the stations according to a preferred pre-coder index, wherein each station provides a corresponding preferred pre-coder index in response to the sounding packet;
comparing the SINRs per stream in a group and selecting a station from the group that provides a best SINR;
recomputing a sum-rate in each group based on a selected station in each group and the selected station'"'"'s corresponding SINR;
selecting a group that provides a best sum-rate;
selecting a pre-coder corresponding to the selected group; and
scheduling the stations in the selected group from two APs.
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Accused Products
Abstract
System and method embodiments are provided for interference alignment in a wireless local area network (LAN) with an overlapping basic service set (OBSS). In an embodiment, a method includes instructing a first access point (AP) in the wireless LAN to broadcast a null data packet (NDP) sounding packet to a plurality of stations when no other AP is broadcasting, wherein the NDP sounding packet comprises a plurality of long training field (LTFs), and wherein a total number of LTFs is equal to a total number of transmission streams, receiving channel beamforming (BF) information and a signal plus interference to noise ratio (SINR) from each of the stations, wherein each of the stations computes the channel BF information and the SINR from sounding packets received from each of the APs in the wireless LAN, and determining a transmission schedule according to the SINRs and the channel BF information.
25 Citations
29 Claims
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1. A method in a network component for interference alignment in a wireless local area network (LAN) with an overlapping basic service set (OBSS), the method comprising:
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instructing with the network component a first one of a plurality of access points (APs) in the wireless LAN to broadcast a null data packet (NDP) sounding packet to a plurality of stations when no other AP in the plurality of APs is broadcasting, wherein the NDP sounding packet comprises a plurality of long training field (LTFs), and wherein a total number of LTFs is equal to a total number of transmission streams per each AP; receiving channel beamforming (BF) information and a signal plus interference to noise ratio (SINR) from each of the plurality of stations, wherein each of the plurality of stations computes the channel BF information and the SINR from sounding packets received from each of the plurality of APs in the wireless LAN; determining a transmission schedule according to the SINRs and the channel BF information; grouping the stations according to a preferred pre-coder index, wherein each station provides a corresponding preferred pre-coder index in response to the sounding packet; comparing the SINRs per stream in a group and selecting a station from the group that provides a best SINR; recomputing a sum-rate in each group based on a selected station in each group and the selected station'"'"'s corresponding SINR;
selecting a group that provides a best sum-rate;
selecting a pre-coder corresponding to the selected group; and
scheduling the stations in the selected group from two APs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A network component configured for interference alignment in a wireless local area network (LAN) with an overlapping basic service set (OBSS) comprising:
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a processor; and a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to; instruct a first one of a plurality of access points (APs) in the wireless LAN to broadcast a null data packet (NDP) sounding packet to a plurality of stations when no other AP in the plurality of APs is broadcasting, wherein the NDP sounding packet comprises a plurality of long training field (LTFs), and wherein a total number of LTFs is equal to a total number of transmission streams; receive channel beamforming (BF) information and a signal plus interference to noise ratio (SINR) from each of the plurality of stations, wherein each of the plurality of stations computes the channel BF information and the SINR from sounding packets received from each of the plurality of APs in the wireless LAN; determine a transmission schedule according to the SINRs and the channel BF information; group the stations according to a preferred pre-coder index, wherein each station provides a corresponding preferred pre-coder index in response to the sounding packet; compare the SINRs per stream in a group and to select a station from the group that provides a best SINR; recompute a sum-rate in each group based on a selected station in each group and a selected station'"'"'s corresponding SINR;
select a group that provides a best sum-rate select a pre-coder corresponding to the selected group; and
schedule the stations in the selected group from two APs. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method in an access point (AP) for interference alignment in a wireless local area network (LAN) with an overlapping basic service set (OBSS) with multiple APs, the method comprising:
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broadcasting with the AP a null data packet (NDP) sounding packet to a plurality of stations when no other AP in the wireless LAN is broadcasting, wherein the NDP sounding packet comprises a plurality of long training field (LTFs), and wherein a total number of LTFs is equal to a total number of transmission streams per AP; receiving channel beamforming (BF) information and a signal plus interference to noise ratio (SINR) from each of the plurality of stations, wherein each of the plurality of stations computes the channel BF information and the SINR from sounding packets received from at least some of the plurality of APs in the wireless LAN; grouping stations with a same channel BF information in a group; selecting a station within each group that provides a best SINR; determining a sum-rate for each group according to a corresponding selected stations channel BF information and its corresponding SINR; determining a group that provides a best sum-rate; and creating a beamforming matrix according to the channel BF information from the determined group, wherein a first column corresponds to a beamforming vector for a first one of the multiple APs.
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Specification