MIMO WLAN system
First Claim
1. A method of accessing a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
- receiving system information via a first transport channel on a downlink;
transmitting an access request via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information;
monitoring the first transport channel to determine whether an acknowledgement bit is set;
processing a third transport channel on the downlink for an acknowledgment of the transmitted access request if the acknowledgement bit is set; and
repeating the receiving, transmitting, and monitoring if the acknowledgment is not received within a predetermined time period.
1 Assignment
0 Petitions
Accused Products
Abstract
A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgment, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.
-
Citations
23 Claims
-
1. A method of accessing a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
-
receiving system information via a first transport channel on a downlink; transmitting an access request via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information; monitoring the first transport channel to determine whether an acknowledgement bit is set; processing a third transport channel on the downlink for an acknowledgment of the transmitted access request if the acknowledgement bit is set; and repeating the receiving, transmitting, and monitoring if the acknowledgment is not received within a predetermined time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An apparatus in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
-
a receive data processor operative to receive system information via a first transport channel on a downlink; a transmit data processor operative to process an access request for transmission via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information; and a controller operative to monitor the first transport channel to determine whether an acknowledgement bit is set and to direct the receive data processor to process a third transport channel on the downlink for an acknowledgment of the transmitted access request if the acknowledgement bit is set, wherein the receive data processor is operative to receive updated system information, the transmit data processor is operative to process another access request, and the controller is operative to monitor the first transport channel if the acknowledgment is not received within a predetermined time period. - View Dependent Claims (10, 11, 12, 13)
-
-
14. An apparatus in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
-
means for receiving system information via a first transport channel on a downlink; means for transmitting an access request via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information; means for monitoring the first transport channel to determine whether an acknowledgement bit is set; and means for processing a third transport channel on the downlink for an acknowledgment of the transmitted access request if the acknowledgement bit is set, wherein the means for receiving receives updated system information, the means for transmitting processes another access request, and the means for monitoring monitors the first transport channel if the acknowledgement is not received within a predetermined time period. - View Dependent Claims (15, 16, 17, 18)
-
-
19. A computer-program product used use in a wireless multiple-access multiple-input multiple-output (MIMO) communication system comprising a non-transitory computer readable medium having a set of instructions stored thereon, the set of instructions being executable by one or more processors and the set of instructions comprising:
-
instructions for receiving system information via a first transport channel on a downlink; instructions for transmitting an access request via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information; instructions for monitoring the first transport channel to determine whether an acknowledgment bit is set; instructions for processing a third transport channel on the downlink for an acknowledgment of the transmitted access request if the acknowledgement bit is set; and instructions for repeating the receiving, transmitting, and monitoring if the acknowledgment is not received within a predetermined time period. - View Dependent Claims (20, 21, 22, 23)
-
Specification