Beacon Frame Beamforming Training Overhead Reduction
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Solution Overview
Problem
In wireless communication systems, the overhead associated with transmitting beacon and beamforming data reduces the effective throughput of wireless channels, particularly in high-frequency bands like 60 GHz, due to the need for directional antennas and sector sweeping techniques, which increase overhead and reduce data transmission efficiency.
Innovation Solution
The method involves generating communication frames that include parameters indicative of time intervals to separate data units and reduce the duration of beacon and beamforming training timeslots, allowing associated devices to sleep and conserve power, while unassociated devices receive reduced service capability data in discovery beacons and probe responses, thereby optimizing channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beacon and beamforming training data are transmitted using traditional methods, then directional communication reliability is improved, but overhead increases and effective throughput decreases
Solution Approach 1:
The patent combines beacon frames and beamforming training frames into a single unified frame structure. The beacon frame includes both traditional beacon information and beamforming training data (such as sector sweeping information) in one transmission, eliminating the need for separate beacon and training transmissions. This merging reduces the total overhead while maintaining both directional reliability and effective throughput.
2Reliability
If sector sweeping techniques are used for beamforming, then directional transmission quality is improved, but timeslot duration increases and power consumption increases
Solution Approach 1:
The patent implements partial sector sweeping by including sector sweeping information directly within the beacon frame transmission itself, rather than requiring complete separate training sequences. The beacon frame carries sufficient beamforming training data to enable directional communication without necessitating full-duration dedicated training timeslots, thereby reducing the overall timeslot duration while maintaining transmission quality.
3Loss of information
If complete service capability data is transmitted to all devices, then network information completeness is improved, but overhead increases and unassociated devices waste processing resources
Solution Approach 1:
The patent applies local quality by providing different levels of service capability information to different device types. Associated devices receive complete service capability data for full network functionality, while unassociated devices receive only essential discovery information needed for initial connection. This differentiated information delivery reduces overhead for unassociated devices while maintaining information completeness for devices that require it.
Data Source
AI summary
A network interface device generates a packet that includes a beacon frame for transmission in a superframe. The beacon frame is used to announce the presence of a network and also is formatted as a beamforming training (BFT) frame to permit other communication devices to perform beamforming training with the packet. The beacon frame is generated to include (i) a frame control field, (ii) a duration field, (iii) a timestamp field, (iv) information indicative of a time of a subsequent association beamforming training (A-BFT) time slot, and (v) beamforming training information, which includes a countdown field. The network interface device transmits the packet during a beacon timeslot of the superframe, which is separate from an association beamforming training (A-BFT) timeslot of the superframe.