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了解“iw reg get”命令的输出

tag-icon • tag-icon linux wireless-networking wifi-configuration wifi-driver dual-band
了解“iw reg get”命令的输出

iw reg get如果我在我的系统（Ubuntu 16.04.4 LTS，内核 4.13，版本 3.17）中运行该命令iw，我会得到以下输出：

country PT: DFS-ETSI
    (2402 - 2482 @ 40), (N/A, 20), (N/A)
    (5170 - 5250 @ 80), (N/A, 20), (N/A)
    (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS
    (5490 - 5710 @ 160), (N/A, 27), (0 ms), DFS
    (57000 - 66000 @ 2160), (N/A, 40), (N/A)

问题：

  1. 我该如何解释上述信息？虽然我可以猜出第一列指的是什么（我假设<channel-frequency-range> @ <channel-width>），但我不确定其他列。
  2. iw phy此外，上述信息与或命令的输出应该有多兼容iw list？

例如，在我的系统中，我得到了下面显示的命令输出iw list（我只考虑了与 5.0 GHz 频段相关的部分）。鉴于命令5170 - 5250中频率范围存在“N/A”，这些频率不应该像输出中iw reg get那样显示吗？区别是基于信道宽度吗？但话又说回来，为什么不包括 20 MHz 信道宽度的结果？(disabled)iw listiw reg get

Band 2:
        Capabilities: 0x2fe
            HT20/HT40
            SM Power Save disabled
            RX Greenfield
            RX HT20 SGI
            RX HT40 SGI
            TX STBC
            RX STBC 2-streams
            Max AMSDU length: 3839 bytes
            No DSSS/CCK HT40
        Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
        Minimum RX AMPDU time spacing: 2 usec (0x04)
        HT TX/RX MCS rate indexes supported: 0-15, 32
        Bitrates (non-HT):
            * 6.0 Mbps
            * 9.0 Mbps
            * 12.0 Mbps
            * 18.0 Mbps
            * 24.0 Mbps
            * 36.0 Mbps
            * 48.0 Mbps
            * 54.0 Mbps
        Frequencies:
            * 5180 MHz [36] (20.0 dBm)
            * 5190 MHz [38] (20.0 dBm)
            * 5200 MHz [40] (20.0 dBm)
            * 5210 MHz [42] (20.0 dBm)
            * 5220 MHz [44] (20.0 dBm)
            * 5230 MHz [46] (20.0 dBm)
            * 5240 MHz [48] (20.0 dBm)
            * 5250 MHz [50] (disabled)
            * 5260 MHz [52] (20.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5270 MHz [54] (20.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5280 MHz [56] (20.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5290 MHz [58] (20.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5300 MHz [60] (20.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5310 MHz [62] (20.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5320 MHz [64] (20.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5500 MHz [100] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5510 MHz [102] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5520 MHz [104] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5530 MHz [106] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5540 MHz [108] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5550 MHz [110] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5560 MHz [112] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5570 MHz [114] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5580 MHz [116] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5590 MHz [118] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5600 MHz [120] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5610 MHz [122] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5620 MHz [124] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5630 MHz [126] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5640 MHz [128] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5650 MHz [130] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5660 MHz [132] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5670 MHz [134] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5680 MHz [136] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5690 MHz [138] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5700 MHz [140] (27.0 dBm) (radar detection)
              DFS state: usable (for 1693 sec)
              DFS CAC time: 60000 ms
            * 5745 MHz [149] (disabled)
            * 5755 MHz [151] (disabled)
            * 5765 MHz [153] (disabled)
            * 5775 MHz [155] (disabled)
            * 5785 MHz [157] (disabled)
            * 5795 MHz [159] (disabled)
            * 5805 MHz [161] (disabled)
            * 5825 MHz [165] (disabled)
            * 4920 MHz [184] (disabled)
            * 4940 MHz [188] (disabled)
            * 4960 MHz [192] (disabled)
            * 4980 MHz [196] (disabled)

答案1

有趣的问题，我不知道答案，所以这就是我发现的方式：

这源代码3.17 显示了数据的来源。具体来说，

  • 第一组(5250 - 5330 @ 80)是频率范围和最大限度此特定规则适用的带宽（因此您不需要 40 MHz 带宽和 20 MHz 带宽的两个规则）
  • 第二组(N/A, 20)是最大天线增益和最大EIRP（有效全向辐射功率）。
  • 第三组(0 ms)是DFS（动态频率选择）CAC（信道可用性检查）时间。我不知道零值是否特殊。
  • 第四组DFS包含各种标志；再次强调，DFS 是动态频率选择。

N/A并不意味着“这应该被禁用”，而是意味着“对此没有规定”。一些国家会限制最大天线增益，一些国家会限制最大 EIRP，等等。

因此实际值不应超过监管限值，只要符合规定，任何值都可以。

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