802.11aj Channels ====================== .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What frequency bands does 802.11aj operate in?** 802.11aj operates primarily in the 45 GHz and 59-64 GHz bands to support high-throughput wireless communication. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How many channels are available in the 45 GHz band for 802.11aj?** The 45 GHz band supports up to 6 channels of 2.16 GHz bandwidth each. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What channel bandwidths are supported in 802.11aj?** 802.11aj supports 2.16 GHz channels, similar to 802.11ad. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11aj support channel bonding?** No, 802.11aj does not support channel bonding; it operates on single wide channels in the mmWave bands. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are channels in 802.11aj fixed or dynamic?** Channels can be dynamically selected and switched to optimize performance and avoid interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11aj handle channel switching?** The standard specifies procedures for fast channel switching to maintain connectivity and QoS. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are 802.11aj channels overlapping or non-overlapping?** Channels are non-overlapping with wide spacing to reduce interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the channel spacing in the 45 GHz band for 802.11aj?** Approximately 2.16 GHz channel spacing is used. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Is coexistence with 802.11ad supported on the 60 GHz channels?** Yes, 802.11aj includes coexistence mechanisms for devices operating in overlapping frequency ranges. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How are channels allocated in a personal basic service set (PBSS)?** The PBSS Control Point manages channel allocation and scheduling within the PBSS. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11aj support channel aggregation?** No, due to the wide channel bandwidths, channel aggregation is not utilized. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How is interference managed across 802.11aj channels?** Directional antennas and spatial separation, combined with channel switching, help minimize interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can 802.11aj devices operate on legacy 802.11ad channels?** Yes, devices are designed to interoperate and operate on compatible channels in the 60 GHz band. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What regulatory considerations affect 802.11aj channel usage?** Regional regulations dictate available channels and power limits for operation in mmWave bands. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are 802.11aj channels used for outdoor communications?** Yes, 802.11aj is designed to support both indoor and short-range outdoor applications. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11aj channel usage affect range and throughput?** Wide channels enable very high throughput but typically shorter range due to mmWave propagation characteristics. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are there any special channel access mechanisms in 802.11aj?** Directional beamforming and scheduled access periods optimize channel utilization. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the channel utilization strategy in dense deployment scenarios?** Dynamic channel allocation and beamforming reduce contention and improve spatial reuse. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`List of channels ` * :ref:`List of channel widths ` * :ref:`List of Bands ` * :ref:`Reference links ` .. _channels_aj_step4: .. tab-set:: .. tab-item:: List of channels 802.11aj ===================== ======================= ========================== ============== Channel Number (GHz) Center Frequency (GHz) Frequency Range (GHz) DFS Required ===================== ======================= ========================== ============== 1 45.0 44.64 – 45.36 No 2 47.0 46.64 – 47.36 No 3 59.4 59.07 – 59.73 Yes 4 61.0 60.64 – 61.36 Yes 5 62.8 62.44 – 63.16 Yes 6 64.0 63.64 – 64.36 Yes ===================== ======================= ========================== ============== .. _channels_aj_step5: .. tab-set:: .. tab-item:: List of channel widths * channel widths .. _channels_aj_step6: .. tab-set:: .. tab-item:: List of Bands 802.11aj ======================= ====================== ====================== ============================================================ Band Name Frequency Range (GHz) Frequency Range (MHz) Channels ======================= ====================== ====================== ============================================================ China mmWave Band 1 45.0 – 47.0 45000 – 47000 1, 2 China mmWave Band 2 59.4 – 64.0 59400 – 64000 3, 4, 5, 6 ======================= ====================== ====================== ============================================================ .. _channels_aj_step17: .. tab-set:: .. tab-item:: Reference links * Reference links