US 8,913,560 B2Granted

One or multiple bit restricted access window (RAW) end point determination within for single user, multiple user, multiple access, and/or MIMO wireless communications

AssigneeBroadcom Corporation

InventorMatthew James Fischer

Life of this patent

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Abstract

One or multiple bit restricted access window (RAW) end point determination within for single user, multiple user, multiple access, and/or MIMO wireless communications. A RAW is defined in which only devices of the particular class (e.g., low power class, Z class, smart meter station (SMSTA) class, etc.) are allowed access to the communication medium. Indication of the end of such a RAW may be included within one or more bits set within a signal field (SIG) field of a framer packet generated by a given device within the system and transmitted to one or more other devices. After completion of the RAW, other respective devices of at least one other type of class may be provided access to the communication medium. The manner of access to the communication media outside of the RAW may be varied (e.g., scheduled, based on carrier sense multiple access/collision avoidance (CSMA/CA), etc.).

Claims20

Dependent claims

An apparatus comprising:

a baseband processing module configured to generate a frame that includes a signal field (SIG) that includes at least one bit therein set to indicate a restricted access window (RAW) corresponding to a time period in which at least one wireless communication device of a first class has access to a communication medium within a communication system that includes a plurality of wireless communication devices;
and
a radio configured to transmit the frame or a signal corresponding to the frame to at least one of the plurality of wireless communication devices, wherein:
the plurality of wireless communication devices includes the at least one wireless communication device of the first class and at least one communication device of a second class;
after an end of the RAW, the at least one wireless communication device of the second class has the access to the communication medium;
during the RAW, no wireless communication device of the second class has the access to the communication medium and only the at least one wireless communication device of the first class has the access to the communication medium;
and
outside of the RAW, the at least one communication device of the second class and the at least one wireless communication device of the first class has the access to the communication medium based on carrier sense multiple access/collision avoidance (CSMA/CA).

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/739,821Filed 11 Jan 2013 · us provisional application
Priority: 11 Jan 2012
Published: US 2013/0188610 A125 Jul 2013
Granted: 16 Dec 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04W 74/0816
Using carrier sensing, e.g. carrier sense multiple access [CSMA]: with collision avoidance
H04L 5/0007
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT
H04L 27/2601
Systems using multi-frequency codes: multicarrier modulation systems
H04L 27/38
Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems: demodulator circuits; Receiver circuits