WAP supporting complementary subnets in a WLAN
View Patent ↗A wireless access point (WAP) including: a station set identifier and a subnet controller. The station set identifier is configured to identify at least one set of at least two station nodes among the plurality of station nodes and complementary communication options for each station in the at least one set which facilitate concurrent communications between the WAP and the stations in the set. The subnet controller is configured both to generate subnets equal in number to a number of stations in at least one set, and for each subnet an associated beacon channel discrete from the beacon channels of other subnets, together with any required aggregate channels matching each station's identified communication option and an associated medium access control, and further to control transmission of data from the WAP to the at least two station nodes concurrently on the associated subnets.
1. A wireless communication apparatus for providing a wireless local area network (WLAN) to a plurality of wireless stations; and the wireless communication apparatus comprising:
a wireless access point (WAP) having:
a plurality of antenna;
a plurality of shared and discrete components coupled to one another to form transmit and receive chains each coupled to a corresponding one of the plurality of antenna for orthogonal frequency division multiplexed (OFDM) multiple-input multiple-output (MIMO) WLAN communications with the plurality of wireless stations;
a subnet controller coupled to the plurality of shared and discrete components and configured to generate at least two subnets each associated with corresponding ones of the plurality of wireless stations and for each subnet a discrete communication bandwidth including a beacon channel for wireless station association and communication together with a discrete medium access control (MAC) for collision sense multiple access (CSMA) uplinks from each of the plurality of stations to the WAP, and concurrent downlinks of discrete communications from the WAP to a selected one of the plurality of stations associated with a first of the at least two subnets and to a selected other of the plurality of stations associated with a second of the at least two subnets, thereby improving downlink performance of the WAP; and
a station set identifier coupled to the subnet controller and configured to identify an association of each of the plurality of stations with a corresponding one of the at least two subnets, by ranking estimated concurrent downlink airtime requirements of various combinations of each of the plurality of stations and station bandwidths for each of the at least two subnets based on an estimated communication demand and throughput capability at various bandwidths of each of the plurality of stations.
2. The wireless communication apparatus of claim 1 , having the subnet controller further configured to inject a virtual access control indicia into the concurrent downlinks of discrete communications to the at least two subnets which require delayed acknowledgment (ACK) of the concurrent downlink communications from the WAP and further to order receipt confirmation of the concurrent downlink communications using block ACK requests (BAR) to the one and the other of the plurality of stations.
3. The wireless communication apparatus of claim 1 , having the subnet controller further configured to generate the discrete beacon channels together with any additional allocated bandwidth associated with the discrete communication bandwidth for each of the at least two subnets on discrete ones of the communication channels identified in an associated one of the IEEE 802.11 “a”, “b”, “g”, “n” and “ac” communication standards.
4. The wireless communication apparatus of claim 1 , wherein the plurality of shared and discrete components coupled to one another to form transmit chains further comprise:
inverse discrete Fourier transform (IDFT) modules each associated with a corresponding one of the transmit chains for transforming downlink communication streams from a time to a frequency domain and each IDFT module having input bins each associated with a corresponding OFDM sub-channel; and
a spatial mapper coupled to the plurality of input bins of each of the IDFT modules for loading the discrete downlink communications for each of the at least two subnets into discrete input bins of each IDFT module corresponding with the discrete communication bandwidth allocated to each of the at least two subnets.
5. A method for operating a multiple-input multiple-output (MIMO) wireless access point (WAP) having a plurality of antennas and for wireless local area network (WLAN) communications with a plurality of stations on a plurality of orthogonal frequency-division multiplexed (OFDM) sub-channels; and the method comprising:
determining communications options for each of the plurality of stations in terms of at least varying bandwidths supported by each;
ranking for concurrent downlink communications, various combinations of the plurality of stations together with communications options for each, based on at least estimated downlink airtime requirements for each combination; and
generating at least two subnets and for each subnet a discrete communication bandwidth required to support concurrent downlink communications of a highest ranked combination of stations and communication options as determined in the ranking act and each subnet associated with a discrete subset of the plurality of stations, and including a beacon channel for station association and communication, together with a discrete medium access control (MAC) for collision sense multiple access (CSMA) uplinks to the WAP, and concurrent downlinks of discrete communications from the WAP to each subnet; and
transmitting concurrent downlinks of discrete communications from the WAP to a first target station associated with a first of the at least two subnets on the discrete communication bandwidth of the first of the at least two subnets and to a second target station associated with a second of the at least two subnets on the discrete communication bandwidth of the second of the at least two subnets.
6. The method for operating a WAP of claim 5 , wherein the transmitting act further comprises:
injecting a virtual access control indicia into the concurrent downlinks of discrete communications to the at least two subnets which indicia require delayed acknowledgment (ACK) of the concurrent downlink communications from the WAP;
ordering receipt confirmations of the downlink communications from the first target station on the first subnet and the second target station on the second subnet using corresponding block ACK requests (BAR); and
confirming receipt of the concurrent downlink communications using block ACK requests (BAR) to order receipt confirmations from the one and the other of the plurality of stations.
7. The method for operating a WAP of claim 5 , wherein the generating act further comprises:
generating the discrete beacon channels together with any additional allocated bandwidth associated with the discrete communication bandwidth for each of the at least two subnets on discrete ones of the communication channels identified in an associated one of the IEEE 802.11 “a”, “b”, “g”, “n” and “ac” communication standards.
8. The method for operating a WAP of claim 5 , further comprising:
loading the discrete downlink communications for each of the at least two subnets into discrete OFDM sub-channels corresponding with the discrete communication bandwidth allocated to each of the at least two subnets.
9. The method for operating a WAP of claim 5 , wherein the generating act further comprises:
initiating WLAN association with at least one subnet and an associated beacon channel for the plurality of stations;
identifying stations within the at least one subnet for concurrent downlink communications;
generating the second of the at least two subnets; and
sending a channel switch announcement (CSA) to selected ones of the identified stations in the at least one subnet to move to the second of the at least two subnets responsive to the identification act.