wifi: Add support for High Efficiency Resource Units
This commit is contained in:
Stefano Avallone
committed by
Sébastien Deronne
Sébastien Deronne
parent
7bce530e71
commit
8205ef2df0
352
src/wifi/model/he-ru.cc
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352
src/wifi/model/he-ru.cc
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@@ -0,0 +1,352 @@
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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2018
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Stefano Avallone <stavallo@unina.it>
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*/
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#include "he-ru.h"
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#include "ns3/abort.h"
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namespace ns3 {
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const HeRu::SubcarrierGroups HeRu::m_heRuSubcarrierGroups =
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{
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// RUs in a 20 MHz HE PPDU (Table 28-6)
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{ {20, HeRu::RU_26_TONE}, { /* 1 */ {{-121, -96}},
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/* 2 */ {{-95, -70}},
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/* 3 */ {{-68, -43}},
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/* 4 */ {{-42, -17}},
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/* 5 */ {{-16, -4}, {4, 16}},
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/* 6 */ {{17, 42}},
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/* 7 */ {{43, 68}},
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/* 8 */ {{70, 95}},
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/* 9 */ {{96, 121}} } },
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{ {20, HeRu::RU_52_TONE}, { /* 1 */ {{-121, -70}},
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/* 2 */ {{-68, -17}},
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/* 3 */ {{17, 68}},
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/* 4 */ {{70, 121}} } },
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{ {20, HeRu::RU_106_TONE}, { /* 1 */ {{-122, -17}},
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/* 2 */ {{17, 122}} } },
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{ {20, HeRu::RU_242_TONE}, { /* 1 */ {{-122, -2}, {2, 122}} } },
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// RUs in a 40 MHz HE PPDU (Table 28-7)
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{ {40, HeRu::RU_26_TONE}, { /* 1 */ {{-243, -218}},
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/* 2 */ {{-217, -192}},
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/* 3 */ {{-189, -164}},
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/* 4 */ {{-163, -138}},
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/* 5 */ {{-136, -111}},
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/* 6 */ {{-109, -84}},
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/* 7 */ {{-83, -58}},
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/* 8 */ {{-55, -30}},
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/* 9 */ {{-29, -4}},
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/* 10 */ {{4, 29}},
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/* 11 */ {{30, 55}},
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/* 12 */ {{58, 83}},
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/* 13 */ {{84, 109}},
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/* 14 */ {{111, 136}},
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/* 15 */ {{138, 163}},
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/* 16 */ {{164, 189}},
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/* 17 */ {{192, 217}},
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/* 18 */ {{218, 243}} } },
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{ {40, HeRu::RU_52_TONE}, { /* 1 */ {{-243, -192}},
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/* 2 */ {{-189, -138}},
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/* 3 */ {{-109, -58}},
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/* 4 */ {{-55, -4}},
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/* 5 */ {{4, 55}},
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/* 6 */ {{58, 109}},
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/* 7 */ {{138, 189}},
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/* 8 */ {{192, 243}} } },
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{ {40, HeRu::RU_106_TONE}, { /* 1 */ {{-243, -138}},
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/* 2 */ {{-109, -4}},
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/* 3 */ {{4, 109}},
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/* 4 */ {{138, 243}} } },
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{ {40, HeRu::RU_242_TONE}, { /* 1 */ {{-244, -3}},
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/* 2 */ {{3, 244}} } },
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{ {40, HeRu::RU_484_TONE}, { /* 1 */ {{-244, -3}, {3, 244}} } },
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// RUs in an 80 MHz HE PPDU (Table 28-8)
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{ {80, HeRu::RU_26_TONE}, { /* 1 */ {{-499, -474}},
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/* 2 */ {{-473, -448}},
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/* 3 */ {{-445, -420}},
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/* 4 */ {{-419, -394}},
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/* 5 */ {{-392, -367}},
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/* 6 */ {{-365, -340}},
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/* 7 */ {{-339, -314}},
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/* 8 */ {{-311, -286}},
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/* 9 */ {{-285, -260}},
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/* 10 */ {{-257, -232}},
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/* 11 */ {{-231, -206}},
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/* 12 */ {{-203, -178}},
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/* 13 */ {{-177, -152}},
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/* 14 */ {{-150, -125}},
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/* 15 */ {{-123, -98}},
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/* 16 */ {{-97, -72}},
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/* 17 */ {{-69, -44}},
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/* 18 */ {{-43, -18}},
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/* 19 */ {{-16, -4}, {4, 16}},
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/* 20 */ {{18, 43}},
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/* 21 */ {{44, 69}},
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/* 22 */ {{72, 97}},
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/* 23 */ {{98, 123}},
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/* 24 */ {{125, 150}},
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/* 25 */ {{152, 177}},
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/* 26 */ {{178, 203}},
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/* 27 */ {{206, 231}},
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/* 28 */ {{232, 257}},
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/* 29 */ {{260, 285}},
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/* 30 */ {{286, 311}},
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/* 31 */ {{314, 339}},
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/* 32 */ {{340, 365}},
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/* 33 */ {{367, 392}},
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/* 34 */ {{394, 419}},
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/* 35 */ {{420, 445}},
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/* 36 */ {{448, 473}},
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/* 37 */ {{474, 499}} } },
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{ {80, HeRu::RU_52_TONE}, { /* 1 */ {{-499, -448}},
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/* 2 */ {{-445, -394}},
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/* 3 */ {{-365, -314}},
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/* 4 */ {{-311, -260}},
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/* 5 */ {{-257, -206}},
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/* 6 */ {{-203, -152}},
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/* 7 */ {{-123, -72}},
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/* 8 */ {{-69, -18}},
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/* 9 */ {{18, 69}},
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/* 10 */ {{72, 123}},
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/* 11 */ {{152, 203}},
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/* 12 */ {{206, 257}},
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/* 13 */ {{260, 311}},
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/* 14 */ {{314, 365}},
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/* 15 */ {{394, 445}},
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/* 16 */ {{448, 499}} } },
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{ {80, HeRu::RU_106_TONE}, { /* 1 */ {{-499, -394}},
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/* 2 */ {{-365, -260}},
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/* 3 */ {{-257, -152}},
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/* 4 */ {{-123, -18}},
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/* 5 */ {{18, 123}},
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/* 6 */ {{152, 257}},
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/* 7 */ {{260, 365}},
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/* 8 */ {{394, 499}} } },
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{ {80, HeRu::RU_242_TONE}, { /* 1 */ {{-500, -259}},
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/* 2 */ {{-258, -17}},
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/* 3 */ {{17, 258}},
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/* 4 */ {{259, 500}} } },
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{ {80, HeRu::RU_484_TONE}, { /* 1 */ {{-500, -17}},
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/* 2 */ {{17, 500}} } },
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{ {80, HeRu::RU_996_TONE}, { /* 1 */ {{-500, -3}, {3, 500}} } }
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};
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std::size_t
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HeRu::GetNRus (uint8_t bw, RuType ruType)
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{
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if (bw == 160 && ruType == RU_2x996_TONE)
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{
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return 1;
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}
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// if the bandwidth is 160MHz, search for the number of RUs available
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// in 80MHz and double the result.
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auto it = m_heRuSubcarrierGroups.find ({(bw == 160 ? 80 : bw), ruType});
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if (it == m_heRuSubcarrierGroups.end ())
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{
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return 0;
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}
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return (bw == 160 ? 2 : 1) * it->second.size ();
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}
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HeRu::SubcarrierGroup
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HeRu::GetSubcarrierGroup (uint8_t bw, RuType ruType, std::size_t index)
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{
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if (ruType == HeRu::RU_2x996_TONE) //handle special case of RU covering 160 MHz channel
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{
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NS_ABORT_MSG_IF (bw != 160, "2x996 tone RU can only be used on 160 MHz band");
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return {{-1012, -3}, {3, 1012}};
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}
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// Determine the shift to apply to tone indices for 160 MHz channel (i.e. -1012 to 1012), since
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// m_heRuSubcarrierGroups contains indices for primary 80 MHz subchannel (i.e. from -500 to 500).
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// The index is used to that aim.
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std::size_t indexInPrimary80MHz = index;
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std::size_t numRus = GetNRus (bw, ruType);
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int16_t shift = (bw == 160) ? -512 : 0;
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if (bw == 160 && index > (numRus / 2))
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{
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// The provided index is that of the secondary 80 MHz subchannel
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indexInPrimary80MHz = index - (numRus / 2);
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shift = 512;
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}
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auto it = m_heRuSubcarrierGroups.find ({(bw == 160 ? 80 : bw), ruType});
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NS_ABORT_MSG_IF (it == m_heRuSubcarrierGroups.end (), "RU not found");
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NS_ABORT_MSG_IF (!indexInPrimary80MHz || indexInPrimary80MHz > it->second.size (), "RU index not available");
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SubcarrierGroup group = it->second.at (indexInPrimary80MHz - 1);
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if (bw == 160)
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{
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for (auto & range : group)
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{
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range.first += shift;
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range.second += shift;
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}
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}
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return group;
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}
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bool
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HeRu::DoesOverlap (uint8_t bw, RuSpec ru, const std::vector<RuSpec> &v)
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{
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// A 2x996-tone RU spans 160 MHz, hence it overlaps with any other RU
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if (bw == 160 && ru.ruType == RU_2x996_TONE && !v.empty ())
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{
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return true;
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}
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SubcarrierGroup groups = GetSubcarrierGroup (bw, ru.ruType, ru.index);
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for (auto& p : v)
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{
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if (ru.primary80MHz != p.primary80MHz)
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{
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// the two RUs are located in distinct 80MHz bands
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continue;
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}
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if (DoesOverlap (bw, p, groups))
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{
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return true;
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}
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}
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return false;
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}
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bool
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HeRu::DoesOverlap (uint8_t bw, RuSpec ru, const SubcarrierGroup &toneRanges)
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{
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for (const auto & range : toneRanges)
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{
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if (bw == 160 && ru.ruType == RU_2x996_TONE)
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{
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return true;
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}
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SubcarrierGroup rangesRu = GetSubcarrierGroup (bw, ru.ruType, ru.index);
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for (auto& r : rangesRu)
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{
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if (range.second >= r.first && r.second >= range.first)
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{
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return true;
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}
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}
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}
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return false;
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}
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std::ostream& operator<< (std::ostream& os, const HeRu::RuType &ruType)
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{
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switch (ruType)
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{
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case HeRu::RU_26_TONE:
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os << "26-tones";
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break;
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case HeRu::RU_52_TONE:
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os << "52-tones";
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break;
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case HeRu::RU_106_TONE:
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os << "106-tones";
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break;
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case HeRu::RU_242_TONE:
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os << "242-tones";
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break;
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case HeRu::RU_484_TONE:
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os << "484-tones";
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break;
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case HeRu::RU_996_TONE:
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os << "996-tones";
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break;
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case HeRu::RU_2x996_TONE:
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os << "2x996-tones";
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break;
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default:
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NS_FATAL_ERROR ("Unknown RU type");
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}
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return os;
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}
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std::ostream& operator<< (std::ostream& os, const HeRu::RuSpec &ru)
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{
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os << "RU{" << ru.ruType << "/" << ru.index << "/" << (ru.primary80MHz ? "primary80MHz" : "secondary80MHz") << "}";
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return os;
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}
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uint16_t
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HeRu::GetBandwidth (RuType ruType)
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{
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switch (ruType)
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{
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case RU_26_TONE:
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return 2;
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case RU_52_TONE:
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return 4;
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case RU_106_TONE:
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return 8;
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case RU_242_TONE:
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return 20;
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case RU_484_TONE:
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return 40;
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case RU_996_TONE:
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return 80;
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case RU_2x996_TONE:
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return 160;
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default:
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NS_ABORT_MSG ("RU type " << ruType << " not found");
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return 0;
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}
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}
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HeRu::RuType
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HeRu::GetEqualSizedRusForStations (uint16_t bandwidth, std::size_t& nStations)
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{
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RuType ruType;
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uint8_t nRusAssigned = 0;
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// iterate over all the available RU types
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for (auto& ru : m_heRuSubcarrierGroups)
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{
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if (ru.first.first == bandwidth && ru.second.size () <= nStations)
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{
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ruType = ru.first.second;
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nRusAssigned = ru.second.size ();
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break;
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}
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else if (bandwidth == 160 && ru.first.first == 80 && (2 * ru.second.size () <= nStations))
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{
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ruType = ru.first.second;
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nRusAssigned = 2 * ru.second.size ();
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break;
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}
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}
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if (nRusAssigned == 0)
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{
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NS_ABORT_IF (bandwidth != 160 || nStations != 1);
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nRusAssigned = 1;
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ruType = RU_2x996_TONE;
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}
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nStations = nRusAssigned;
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return ruType;
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}
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} //namespace ns3
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173
src/wifi/model/he-ru.h
Normal file
173
src/wifi/model/he-ru.h
Normal file
@@ -0,0 +1,173 @@
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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2018
|
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*
|
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* This program is free software; you can redistribute it and/or modify
|
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* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation;
|
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*
|
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* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
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*
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* Author: Stefano Avallone <stavallo@unina.it>
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*/
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#ifndef HE_RU_H
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#define HE_RU_H
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#include <map>
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#include <vector>
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#include <cstdint>
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#include <ostream>
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namespace ns3 {
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/**
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* This class stores the subcarrier groups of all the available HE RUs.
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*/
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class HeRu
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{
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public:
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/**
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* The different HE Resource Unit (RU) types.
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*/
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enum RuType
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{
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RU_26_TONE = 0,
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RU_52_TONE,
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RU_106_TONE,
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RU_242_TONE,
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RU_484_TONE,
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RU_996_TONE,
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RU_2x996_TONE
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};
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/// (lowest index, highest index) pair defining a subcarrier range
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typedef std::pair<int16_t, int16_t> SubcarrierRange;
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/// a vector of subcarrier ranges defining a subcarrier group
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typedef std::vector<SubcarrierRange> SubcarrierGroup;
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/**
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* RU Specification. Stores the information carried by the RU Allocation
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* subfield of the User Info field of Trigger frames. Note that primary80MHz
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* must be true if ruType is RU_2x996_TONE.
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*/
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typedef struct
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{
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bool primary80MHz; //!< true if the RU is allocated in the primary 80MHz channel
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RuType ruType; //!< RU type
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std::size_t index; //!< index (starting at 1)
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} RuSpec;
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/**
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* Get the number of distinct RUs of the given type (number of tones)
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* available in a HE PPDU of the given bandwidth.
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*
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* \param bw the bandwidth (MHz) of the HE PPDU (20, 40, 80, 160)
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* \param ruType the RU type (number of tones)
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* \return the number of distinct RUs available
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*/
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static std::size_t GetNRus (uint8_t bw, RuType ruType);
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/**
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* Get the subcarrier group of the RU having the given index among all the
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* RUs of the given type (number of tones) available in a HE PPDU of the
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* given bandwidth. A subcarrier group is defined as one or more pairs
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* indicating the lowest frequency index and the highest frequency index.
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* Note that for channel width of 160 MHz the returned range is relative to
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* the 160 MHz channel (i.e. -1012 to 1012). The index parameter is used to
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* distinguish between primary and secondary 80 MHz subchannels.
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*
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* \param bw the bandwidth (MHz) of the HE PPDU (20, 40, 80, 160)
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* \param ruType the RU type (number of tones)
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* \param index the index (starting at 1) of the RU
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* \return the subcarrier range of the specified RU
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*/
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static SubcarrierGroup GetSubcarrierGroup (uint8_t bw, RuType ruType, std::size_t index);
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/**
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* Check whether the given RU overlaps with the given set of RUs.
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* Note that for channel width of 160 MHz the returned range is relative to
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* the 160 MHz channel (i.e. -1012 to 1012).
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*
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* \param bw the bandwidth (MHz) of the HE PPDU (20, 40, 80, 160)
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* \param ru the given RU allocation
|
||||
* \param v the given set of RUs
|
||||
* \return true if the given RU overlaps with the given set of RUs.
|
||||
*/
|
||||
static bool DoesOverlap (uint8_t bw, RuSpec ru, const std::vector<RuSpec> &v);
|
||||
|
||||
/**
|
||||
* Check whether the given RU overlaps with the given tone ranges.
|
||||
* Note that for channel width of 160 MHz the returned range is relative to
|
||||
* the 160 MHz channel (i.e. -1012 to 1012).
|
||||
*
|
||||
* \param bw the bandwidth (MHz) of the HE PPDU (20, 40, 80, 160)
|
||||
* \param ru the given RU allocation
|
||||
* \param toneRanges the given set of tone ranges
|
||||
* \return true if the given RU overlaps with the given set of tone ranges.
|
||||
*/
|
||||
static bool DoesOverlap (uint8_t bw, RuSpec ru, const SubcarrierGroup &toneRanges);
|
||||
|
||||
/**
|
||||
* Get the approximate bandwidth occupied by a RU.
|
||||
*
|
||||
* \param ruType the RU type
|
||||
* \return the approximate bandwidth (in MHz) occupied by the RU
|
||||
*/
|
||||
static uint16_t GetBandwidth (RuType ruType);
|
||||
|
||||
/**
|
||||
* Given the channel bandwidth and the number of stations candidate for being
|
||||
* assigned an RU, maximize the number of candidate stations that can be assigned
|
||||
* an RU subject to the constraint that all the stations must be assigned an RU
|
||||
* of the same size (in terms of number of tones).
|
||||
*
|
||||
* \param bandwidth the channel bandwidth in MHz
|
||||
* \param nStations the number of candidate stations. On return, it is set to
|
||||
* the number of stations that are assigned an RU
|
||||
* \return the RU type
|
||||
*/
|
||||
static RuType GetEqualSizedRusForStations (uint16_t bandwidth, std::size_t& nStations);
|
||||
|
||||
/// (bandwidth, number of tones) pair
|
||||
typedef std::pair<uint8_t, RuType> BwTonesPair;
|
||||
|
||||
/// map (bandwidth, number of tones) pairs to the group of subcarrier ranges
|
||||
typedef std::map<BwTonesPair, std::vector<SubcarrierGroup> > SubcarrierGroups;
|
||||
|
||||
//!< Subcarrier groups for all RUs (with indices being applicable to primary 80 MHz channel)
|
||||
static const SubcarrierGroups m_heRuSubcarrierGroups;
|
||||
};
|
||||
|
||||
/**
|
||||
* \brief Stream insertion operator.
|
||||
*
|
||||
* \param os the stream
|
||||
* \param ruType the RU type
|
||||
* \returns a reference to the stream
|
||||
*/
|
||||
std::ostream& operator<< (std::ostream& os, const HeRu::RuType &ruType);
|
||||
|
||||
/**
|
||||
* \brief Stream insertion operator.
|
||||
*
|
||||
* \param os the stream
|
||||
* \param ru the RU
|
||||
* \returns a reference to the stream
|
||||
*/
|
||||
std::ostream& operator<< (std::ostream& os, const HeRu::RuSpec &ru);
|
||||
|
||||
} //namespace ns3
|
||||
|
||||
#endif /* HE_RU_H */
|
||||
@@ -101,6 +101,7 @@ def build(bld):
|
||||
'model/constant-obss-pd-algorithm.cc',
|
||||
'model/wifi-ack-policy-selector.cc',
|
||||
'model/constant-wifi-ack-policy-selector.cc',
|
||||
'model/he-ru.cc',
|
||||
'helper/wifi-radio-energy-model-helper.cc',
|
||||
'helper/athstats-helper.cc',
|
||||
'helper/wifi-helper.cc',
|
||||
@@ -239,6 +240,7 @@ def build(bld):
|
||||
'model/constant-obss-pd-algorithm.h',
|
||||
'model/wifi-ack-policy-selector.h',
|
||||
'model/constant-wifi-ack-policy-selector.h',
|
||||
'model/he-ru.h',
|
||||
'model/reference/error-rate-tables.h',
|
||||
'helper/wifi-radio-energy-model-helper.h',
|
||||
'helper/athstats-helper.h',
|
||||
|
||||
Reference in New Issue
Block a user