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Recommended guidance for guard bands between time slots in Qbv?

According to TSN (Time-Sensitive Networking) standards, the recommended guidelines for guard bands between time slots in Qbv (quality of service-based scheduling) is an offset of at least 2 TSN frames. This guidance is based on the length of TSN frames and their respective transmission intervals. Having a minimum balance of two TSN frames ensures no conflicts arise because TSN frames overlap when transmitted from different traffic classes. As such, it provides a reliable mechanism for preventing data loss or corruption during time-sensitive communication operations. Furthermore, by having this guard band in place, TSN networks can provide a higher quality level of latency control and Quality of Service (QoS). This is because TSN frames transmitted in the same time slot will not interfere with each other and cause delays. Thus, guard bands are essential for TSN networks to ensure reliability and high performance.

Another essential factor to consider when implementing guard bands is the TSN frame size. You need to ensures that TSN frames have sufficient room to be transmitted without interference and allows TSN networks to reduce latency and provide a higher quality of service for time-sensitive communication operations. Furthermore, guard bands also help TSN networks avoid congestion as TSN traffic is distributed across multiple time slots, which reduces contention for resources. Following TSN standards when configuring guard bands is essential to ensure reliable and high-performance communications over TSN networks.

2 thoughts on “Recommended guidance for guard bands between time slots in Qbv?”

  1. Is there an IEEE specification that provides guidance for guard bands? It seems to me that two full size frames as a guard band could be wasting a lot of bandwidth.

    1. Yes, there is an IEEE 802.15.4-2006 specification that guides for guard bands to reduce interference between neighboring systems and provides maximum transmission speed and minimum latency. Guard bands are responsible for ensuring successful communication between two full-size frames, as they provide a buffer preventing overlapping signals from interfering with each other.

      To do this effectively, the guard band must be large enough to avoid collisions due to adjacent transmissions and small enough not to take up too much bandwidth or cause excessive delays in data transmission speeds. The IEEE 802.15.4 recommends having a 36-microsecond guard band when using the CSMA/CA protocol and a 144-microsecond gap when using TDMA-based communication protocols such as Time Slotted Channel Hopping (TSCH). This provides sufficient protection against any unwanted interference while still preserving high data rates and minimizing latency times.

      When it comes to two full-size frames as a guard band, it is essential to note that this will use more bandwidth than necessary since only one frame can be sent at once even if both are active within the same period; however, if long-range communication is needed then having two full-size frames may be favorable in order ensure reliable transmissions across several hops spanning different networks or geographic locations where signals may become weaker over distance or get blocked by obstructing materials like walls and other structures. So whether you decide on one or two full-size frames for your guard bandwidth depends on your specific needs and environmental conditions.

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