802.11aj Packet Formats
What are packet formats in 802.11aj?
802.11aj defines packet formats that include new fields for directional communication and extended channel widths at 45 GHz and 60 GHz.
How do 802.11aj packet formats differ from 802.11ad?
802.11aj extends 802.11ad formats with additional header fields and supports dual-band operation for 45 GHz and 60 GHz.
What frame types are used in 802.11aj?
It supports management, control, and data frames with enhancements for beamforming and multi-band coordination.
Are there new fields in MAC headers for 802.11aj?
Yes, new fields include extended addressing, beamforming parameters, and multi-band indicators.
How does 802.11aj handle beamforming information in packets?
Beamforming training and feedback are embedded in specific control frames with defined formats for phase and amplitude adjustments.
Is the PHY header modified in 802.11aj?
The PHY header remains largely consistent with 802.11ad but supports extensions for dual-band operation and wider channels.
Do 802.11aj packets support multi-link operation?
Yes, packet formats include fields that enable synchronization and coordination across multiple links.
What are the size limits for 802.11aj packets?
Maximum MPDU size is similar to 802.11ad but can be adapted based on channel conditions and dual-band usage.
How is error control handled in 802.11aj packets?
Packets include CRC fields and use forward error correction schemes compatible with high-frequency bands.
Are there new management frames in 802.11aj?
Yes, management frames include enhanced signaling for band switching, beam training, and link maintenance.
How do control frames in 802.11aj support MAC functions?
Control frames manage acknowledgments, block acknowledgments, and scheduling with additional timing and beamforming info.
Is there support for packet aggregation in 802.11aj?
Yes, A-MPDU and A-MSDU aggregation are supported with packet formats accommodating larger aggregated frames.
How are sequence numbers handled in 802.11aj packets?
Sequence numbers track frame order and support retransmission, similar to legacy 802.11 but adapted for multi-link scenarios.
What role do QoS control fields play in 802.11aj packets?
QoS fields prioritize traffic and manage access in scheduled Service Periods and contention-based periods.
Are there new addressing modes in 802.11aj packets?
Extended addressing modes support multi-link and multi-band operation with additional MAC address fields.
How does 802.11aj handle packet fragmentation?
Fragmentation follows 802.11 standards but with timing and coordination adapted for directional and multi-band links.
Are there special packet formats for power saving?
Yes, power management frames include fields for station sleep scheduling and wake-up signaling.
Does 802.11aj support vendor-specific packet extensions?
Vendor-specific fields can be included in management frames for proprietary features while maintaining standard compliance.
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