commit | b6cc940634d2c0af4c953d85b524bafbb72abefe | [log] [tgz] |
---|---|---|
author | Abtin Keshavarzian <abtink@google.com> | Tue Mar 08 17:58:30 2022 -0800 |
committer | GitHub <noreply@github.com> | Tue Mar 08 17:58:30 2022 -0800 |
tree | 4db4d0135d253819db26399121b2f5f5b2bef8d5 | |
parent | 9475bce07a0ed8af8f48fcd76558b66ea85a8706 [diff] |
[mac] feature to add delay on no-ack error before tx retry (#7346) This commit adds a new feature in `SubMac` to add random delay before frame retransmissions. The delay is added only if the previous tx resulted in `kErrorNoAck`. A backoff algorithm similar to one used for CSMA is used to determine the random delay, i.e., starting with a min backoff exponent (BE) which is incremented each time delay is added up to a max backoff exponent. The backoff interval is derived by selecting a random value from `[0, 2^BE]` range multiplied by `kUnitBackoffPeriod=20` times radio symbol time (20x16=320 usec). The `OPENTHREAD_CONFIG_MAC_ADD_DELAY_ON_NO_ACK_ERROR_BEFORE_RETRY` is added to enable this behavior (which is enabled by default). This commit also adds other configs for this feature including minimum and maximum backoff exponents (the values are from Thread 1.3 spec recommendations).
OpenThread released by Google is...
...an open-source implementation of the Thread networking protocol. Google Nest has released OpenThread to make the technology used in Nest products more broadly available to developers to accelerate the development of products for the connected home.
...OS and platform agnostic, with a narrow platform abstraction layer and a small memory footprint, making it highly portable. It supports both system-on-chip (SoC) and network co-processor (NCP) designs.
...a Thread Certified Component, implementing all features defined in the Thread 1.2 specification, including all Thread networking layers (IPv6, 6LoWPAN, IEEE 802.15.4 with MAC security, Mesh Link Establishment, Mesh Routing) and device roles, as well as Border Router support.
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