lte-ffr-distributed-algorithm.cc

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/*
 * Copyright (c) 2014 Piotr Gawlowicz
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Piotr Gawlowicz <gawlowicz.p@gmail.com>
 *
 */
 
#include "lte-ffr-distributed-algorithm.h"
 
#include "ns3/log.h"
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("LteFfrDistributedAlgorithm");
 
NS_OBJECT_ENSURE_REGISTERED(LteFfrDistributedAlgorithm);
 
LteFfrDistributedAlgorithm::LteFfrDistributedAlgorithm()
    : m_ffrSapUser(nullptr),
      m_ffrRrcSapUser(nullptr)
{
    NS_LOG_FUNCTION(this);
    m_ffrSapProvider = new MemberLteFfrSapProvider<LteFfrDistributedAlgorithm>(this);
    m_ffrRrcSapProvider = new MemberLteFfrRrcSapProvider<LteFfrDistributedAlgorithm>(this);
}
 
LteFfrDistributedAlgorithm::~LteFfrDistributedAlgorithm()
{
    NS_LOG_FUNCTION(this);
}
 
void
LteFfrDistributedAlgorithm::DoDispose()
{
    NS_LOG_FUNCTION(this);
    delete m_ffrSapProvider;
    delete m_ffrRrcSapProvider;
}
 
TypeId
LteFfrDistributedAlgorithm::GetTypeId()
{
    static TypeId tid =
        TypeId("ns3::LteFfrDistributedAlgorithm")
            .SetParent<LteFfrAlgorithm>()
            .SetGroupName("Lte")
            .AddConstructor<LteFfrDistributedAlgorithm>()
            .AddAttribute(
                "CalculationInterval",
                "Time interval between calculation of Edge sub-band, Default value 1 second",
                TimeValue(Seconds(1)),
                MakeTimeAccessor(&LteFfrDistributedAlgorithm::m_calculationInterval),
                MakeTimeChecker())
            .AddAttribute(
                "RsrqThreshold",
                "If the RSRQ of is worse than this threshold, UE should be served in Edge sub-band",
                UintegerValue(20),
                MakeUintegerAccessor(&LteFfrDistributedAlgorithm::m_edgeSubBandRsrqThreshold),
                MakeUintegerChecker<uint8_t>())
            .AddAttribute(
                "RsrpDifferenceThreshold",
                "If the difference between the power of the signal received by UE from "
                "the serving cell and the power of the signal received from the adjacent cell is "
                "less "
                "than a RsrpDifferenceThreshold value, the cell weight is incremented",
                UintegerValue(20),
                MakeUintegerAccessor(&LteFfrDistributedAlgorithm::m_rsrpDifferenceThreshold),
                MakeUintegerChecker<uint8_t>())
            .AddAttribute("CenterPowerOffset",
                          "PdschConfigDedicated::Pa value for Center Sub-band, default value dB0",
                          UintegerValue(5),
                          MakeUintegerAccessor(&LteFfrDistributedAlgorithm::m_centerPowerOffset),
                          MakeUintegerChecker<uint8_t>())
            .AddAttribute("EdgePowerOffset",
                          "PdschConfigDedicated::Pa value for Edge Sub-band, default value dB0",
                          UintegerValue(5),
                          MakeUintegerAccessor(&LteFfrDistributedAlgorithm::m_edgePowerOffset),
                          MakeUintegerChecker<uint8_t>())
            .AddAttribute("EdgeRbNum",
                          "Number of RB that can be used in edge Sub-band",
                          UintegerValue(8),
                          MakeUintegerAccessor(&LteFfrDistributedAlgorithm::m_edgeRbNum),
                          MakeUintegerChecker<uint8_t>())
            .AddAttribute("CenterAreaTpc",
                          "TPC value which will be set in DL-DCI for UEs in center area"
                          "Absolute mode is used, default value 1 is mapped to -1 according to"
                          "TS36.213 Table 5.1.1.1-2",
                          UintegerValue(1),
                          MakeUintegerAccessor(&LteFfrDistributedAlgorithm::m_centerAreaTpc),
                          MakeUintegerChecker<uint8_t>())
            .AddAttribute("EdgeAreaTpc",
                          "TPC value which will be set in DL-DCI for UEs in edge area"
                          "Absolute mode is used, default value 1 is mapped to -1 according to"
                          "TS36.213 Table 5.1.1.1-2",
                          UintegerValue(1),
                          MakeUintegerAccessor(&LteFfrDistributedAlgorithm::m_edgeAreaTpc),
                          MakeUintegerChecker<uint8_t>())
 
        ;
    return tid;
}
 
void
LteFfrDistributedAlgorithm::SetLteFfrSapUser(LteFfrSapUser* s)
{
    NS_LOG_FUNCTION(this << s);
    m_ffrSapUser = s;
}
 
LteFfrSapProvider*
LteFfrDistributedAlgorithm::GetLteFfrSapProvider()
{
    NS_LOG_FUNCTION(this);
    return m_ffrSapProvider;
}
 
void
LteFfrDistributedAlgorithm::SetLteFfrRrcSapUser(LteFfrRrcSapUser* s)
{
    NS_LOG_FUNCTION(this << s);
    m_ffrRrcSapUser = s;
}
 
LteFfrRrcSapProvider*
LteFfrDistributedAlgorithm::GetLteFfrRrcSapProvider()
{
    NS_LOG_FUNCTION(this);
    return m_ffrRrcSapProvider;
}
 
void
LteFfrDistributedAlgorithm::DoInitialize()
{
    NS_LOG_FUNCTION(this);
    LteFfrAlgorithm::DoInitialize();
 
    if (m_frCellTypeId != 0)
    {
        SetDownlinkConfiguration(m_frCellTypeId, m_dlBandwidth);
        SetUplinkConfiguration(m_frCellTypeId, m_ulBandwidth);
    }
 
    NS_LOG_LOGIC(this << " requesting Event A1 and A4 measurements"
                      << " (threshold = 0"
                      << ")");
    LteRrcSap::ReportConfigEutra reportConfig;
    reportConfig.eventId = LteRrcSap::ReportConfigEutra::EVENT_A1;
    reportConfig.threshold1.choice = LteRrcSap::ThresholdEutra::THRESHOLD_RSRQ;
    reportConfig.threshold1.range = 0;
    reportConfig.triggerQuantity = LteRrcSap::ReportConfigEutra::RSRQ;
    reportConfig.reportInterval = LteRrcSap::ReportConfigEutra::MS120;
    m_rsrqMeasId = m_ffrRrcSapUser->AddUeMeasReportConfigForFfr(reportConfig);
 
    LteRrcSap::ReportConfigEutra reportConfigA4;
    reportConfigA4.eventId = LteRrcSap::ReportConfigEutra::EVENT_A4;
    reportConfigA4.threshold1.choice = LteRrcSap::ThresholdEutra::THRESHOLD_RSRP;
    reportConfigA4.threshold1.range = 0; // intentionally very low threshold
    reportConfigA4.triggerQuantity = LteRrcSap::ReportConfigEutra::RSRP;
    reportConfigA4.reportInterval = LteRrcSap::ReportConfigEutra::MS120;
    m_rsrpMeasId = m_ffrRrcSapUser->AddUeMeasReportConfigForFfr(reportConfigA4);
 
    int rbgSize = GetRbgSize(m_dlBandwidth);
    m_dlEdgeRbgMap.resize(m_dlBandwidth / rbgSize, false);
    m_ulEdgeRbgMap.resize(m_ulBandwidth, false);
    m_calculationEvent = Simulator::ScheduleNow(&LteFfrDistributedAlgorithm::Calculate, this);
}
 
void
LteFfrDistributedAlgorithm::Reconfigure()
{
    NS_LOG_FUNCTION(this);
    if (m_frCellTypeId != 0)
    {
        SetDownlinkConfiguration(m_frCellTypeId, m_dlBandwidth);
        SetUplinkConfiguration(m_frCellTypeId, m_ulBandwidth);
    }
    InitializeDownlinkRbgMaps();
    InitializeUplinkRbgMaps();
    m_needReconfiguration = false;
}
 
void
LteFfrDistributedAlgorithm::SetDownlinkConfiguration(uint16_t cellId, uint8_t bandwidth)
{
    NS_LOG_FUNCTION(this);
}
 
void
LteFfrDistributedAlgorithm::SetUplinkConfiguration(uint16_t cellId, uint8_t bandwidth)
{
    NS_LOG_FUNCTION(this);
}
 
void
LteFfrDistributedAlgorithm::InitializeDownlinkRbgMaps()
{
    NS_LOG_FUNCTION(this);
    m_dlRbgMap.clear();
    int rbgSize = GetRbgSize(m_dlBandwidth);
    m_dlRbgMap.resize(m_dlBandwidth / rbgSize, false);
}
 
void
LteFfrDistributedAlgorithm::InitializeUplinkRbgMaps()
{
    NS_LOG_FUNCTION(this);
    m_ulRbgMap.clear();
    m_ulRbgMap.resize(m_ulBandwidth, false);
}
 
std::vector<bool>
LteFfrDistributedAlgorithm::DoGetAvailableDlRbg()
{
    NS_LOG_FUNCTION(this);
 
    if (m_needReconfiguration)
    {
        Reconfigure();
    }
 
    if (m_dlRbgMap.empty())
    {
        InitializeDownlinkRbgMaps();
    }
 
    return m_dlRbgMap;
}
 
bool
LteFfrDistributedAlgorithm::DoIsDlRbgAvailableForUe(int rbgId, uint16_t rnti)
{
    NS_LOG_FUNCTION(this);
 
    bool edgeRbg = m_dlEdgeRbgMap[rbgId];
 
    auto it = m_ues.find(rnti);
    if (it == m_ues.end())
    {
        m_ues.insert(std::pair<uint16_t, uint8_t>(rnti, AreaUnset));
        return !edgeRbg;
    }
 
    bool edgeUe = false;
    if (it->second == EdgeArea)
    {
        edgeUe = true;
    }
 
    return (edgeRbg && edgeUe) || (!edgeRbg && !edgeUe);
}
 
std::vector<bool>
LteFfrDistributedAlgorithm::DoGetAvailableUlRbg()
{
    NS_LOG_FUNCTION(this);
 
    if (m_ulRbgMap.empty())
    {
        InitializeUplinkRbgMaps();
    }
 
    return m_ulRbgMap;
}
 
bool
LteFfrDistributedAlgorithm::DoIsUlRbgAvailableForUe(int rbId, uint16_t rnti)
{
    NS_LOG_FUNCTION(this);
 
    if (!m_enabledInUplink)
    {
        return true;
    }
 
    bool edgeRbg = m_ulEdgeRbgMap[rbId];
 
    auto it = m_ues.find(rnti);
    if (it == m_ues.end())
    {
        m_ues.insert(std::pair<uint16_t, uint8_t>(rnti, AreaUnset));
        return !edgeRbg;
    }
 
    bool edgeUe = false;
    if (it->second == EdgeArea)
    {
        edgeUe = true;
    }
 
    return (edgeRbg && edgeUe) || (!edgeRbg && !edgeUe);
}
 
void
LteFfrDistributedAlgorithm::DoReportDlCqiInfo(
    const FfMacSchedSapProvider::SchedDlCqiInfoReqParameters& params)
{
    NS_LOG_FUNCTION(this);
    NS_LOG_WARN("Method should not be called, because it is empty");
}
 
void
LteFfrDistributedAlgorithm::DoReportUlCqiInfo(
    const FfMacSchedSapProvider::SchedUlCqiInfoReqParameters& params)
{
    NS_LOG_FUNCTION(this);
    NS_LOG_WARN("Method should not be called, because it is empty");
}
 
void
LteFfrDistributedAlgorithm::DoReportUlCqiInfo(std::map<uint16_t, std::vector<double>> ulCqiMap)
{
    NS_LOG_FUNCTION(this);
    NS_LOG_WARN("Method should not be called, because it is empty");
}
 
uint8_t
LteFfrDistributedAlgorithm::DoGetTpc(uint16_t rnti)
{
    NS_LOG_FUNCTION(this);
 
    if (!m_enabledInUplink)
    {
        return 1; // 1 is mapped to 0 for Accumulated mode, and to -1 in Absolute mode TS36.213
                  // Table 5.1.1.1-2
    }
 
    // TS36.213 Table 5.1.1.1-2
    //    TPC   |   Accumulated Mode  |  Absolute Mode
    //------------------------------------------------
    //     0    |         -1          |      -4
    //     1    |          0          |      -1
    //     2    |          1          |       1
    //     3    |          3          |       4
    //------------------------------------------------
    //  here Absolute mode is used
 
    auto it = m_ues.find(rnti);
    if (it == m_ues.end())
    {
        return 1;
    }
 
    if (it->second == EdgeArea)
    {
        return m_edgeAreaTpc;
    }
    else
    {
        return m_centerAreaTpc;
    }
 
    return 1;
}
 
uint16_t
LteFfrDistributedAlgorithm::DoGetMinContinuousUlBandwidth()
{
    NS_LOG_FUNCTION(this);
 
    uint8_t minContinuousUlBandwidth = m_ulBandwidth;
 
    if (!m_enabledInUplink)
    {
        return minContinuousUlBandwidth;
    }
 
    minContinuousUlBandwidth = ((m_edgeRbNum > 0) && (m_edgeRbNum < minContinuousUlBandwidth))
                                   ? m_edgeRbNum
                                   : minContinuousUlBandwidth;
 
    return minContinuousUlBandwidth;
}
 
void
LteFfrDistributedAlgorithm::DoReportUeMeas(uint16_t rnti, LteRrcSap::MeasResults measResults)
{
    NS_LOG_FUNCTION(this << rnti << (uint16_t)measResults.measId);
    NS_LOG_INFO("CellId: " << m_cellId << " RNTI :" << rnti
                           << " MeasId: " << (uint16_t)measResults.measId
                           << " RSRP: " << (uint16_t)measResults.measResultPCell.rsrpResult
                           << " RSRQ: " << (uint16_t)measResults.measResultPCell.rsrqResult);
 
    if (measResults.measId == m_rsrqMeasId)
    {
        // check if it is center or edge UE
        auto it = m_ues.find(rnti);
        if (it == m_ues.end())
        {
            m_ues.insert(std::pair<uint16_t, uint8_t>(rnti, AreaUnset));
        }
 
        it = m_ues.find(rnti);
        if (measResults.measResultPCell.rsrqResult >= m_edgeSubBandRsrqThreshold)
        {
            if (it->second != CenterArea)
            {
                NS_LOG_INFO("UE RNTI: " << rnti << " will be served in Center sub-band");
                it->second = CenterArea;
 
                LteRrcSap::PdschConfigDedicated pdschConfigDedicated;
                pdschConfigDedicated.pa = m_centerPowerOffset;
                m_ffrRrcSapUser->SetPdschConfigDedicated(rnti, pdschConfigDedicated);
            }
        }
        else
        {
            if (it->second != EdgeArea)
            {
                NS_LOG_INFO("UE RNTI: " << rnti << " will be served in Edge sub-band");
                it->second = EdgeArea;
 
                LteRrcSap::PdschConfigDedicated pdschConfigDedicated;
                pdschConfigDedicated.pa = m_edgePowerOffset;
                m_ffrRrcSapUser->SetPdschConfigDedicated(rnti, pdschConfigDedicated);
            }
        }
    }
    else if (measResults.measId == m_rsrpMeasId)
    {
        auto it = m_ues.find(rnti);
        if (it == m_ues.end())
        {
            m_ues.insert(std::pair<uint16_t, uint8_t>(rnti, AreaUnset));
        }
 
        UpdateNeighbourMeasurements(rnti,
                                    m_cellId,
                                    measResults.measResultPCell.rsrpResult,
                                    measResults.measResultPCell.rsrqResult);
 
        if (measResults.haveMeasResultNeighCells && !measResults.measResultListEutra.empty())
        {
            for (auto it = measResults.measResultListEutra.begin();
                 it != measResults.measResultListEutra.end();
                 ++it)
            {
                NS_ASSERT_MSG(it->haveRsrpResult == true,
                              "RSRP measurement is missing from cellId " << it->physCellId);
                NS_ASSERT_MSG(it->haveRsrqResult == true,
                              "RSRQ measurement is missing from cellId " << it->physCellId);
                UpdateNeighbourMeasurements(rnti, it->physCellId, it->rsrpResult, it->rsrqResult);
 
                bool found = false;
                for (auto ncIt = m_neighborCell.begin(); ncIt != m_neighborCell.end(); ncIt++)
                {
                    if ((*ncIt) == it->physCellId)
                    {
                        found = true;
                    }
                }
                if (!found)
                {
                    m_neighborCell.push_back(it->physCellId);
                }
            }
        }
        else
        {
            NS_LOG_WARN(
                this << " Event A4 received without measurement results from neighbouring cells");
        }
    }
    else
    {
        NS_LOG_WARN("Ignoring measId " << (uint16_t)measResults.measId);
    }
}
 
void
LteFfrDistributedAlgorithm::Calculate()
{
    NS_LOG_FUNCTION(this);
    m_calculationEvent =
        Simulator::Schedule(m_calculationInterval, &LteFfrDistributedAlgorithm::Calculate, this);
 
    int rbgSize = GetRbgSize(m_dlBandwidth);
    uint16_t rbgNum = m_dlBandwidth / rbgSize;
 
    m_cellWeightMap.clear();
    m_dlEdgeRbgMap.clear();
    m_dlEdgeRbgMap.resize(m_dlBandwidth / rbgSize, false);
    m_ulEdgeRbgMap.clear();
    m_ulEdgeRbgMap.resize(m_ulBandwidth, false);
 
    uint32_t edgeUeNum = 0;
    for (auto areaIt = m_ues.begin(); areaIt != m_ues.end(); areaIt++)
    {
        if (areaIt->second == EdgeArea)
        {
            edgeUeNum++;
        }
    }
 
    if (edgeUeNum != 0)
    {
        for (auto it1 = m_ueMeasures.begin(); it1 != m_ueMeasures.end(); it1++)
        {
            auto areaIt = m_ues.find(it1->first);
            if (areaIt->second != EdgeArea)
            {
                continue;
            }
 
            auto it2 = it1->second.find(m_cellId);
            if (it2 == it1->second.end())
            {
                continue;
            }
            std::shared_ptr<UeMeasure> servingCellMeasures = it2->second;
 
            for (it2 = it1->second.begin(); it2 != it1->second.end(); it2++)
            {
                if (it2->first == m_cellId)
                {
                    continue;
                }
                std::shared_ptr<UeMeasure> neighbourCellMeasures = it2->second;
 
                if (servingCellMeasures && neighbourCellMeasures)
                {
                    int16_t rsrpDifference =
                        servingCellMeasures->m_rsrp - neighbourCellMeasures->m_rsrp;
                    NS_LOG_INFO("CellId: " << m_cellId << " UE RNTI: " << it1->first
                                           << " NeighborCellId: " << neighbourCellMeasures->m_cellId
                                           << " RSRP Serving: " << (int)servingCellMeasures->m_rsrp
                                           << " RSRP Neighbor: "
                                           << (int)neighbourCellMeasures->m_rsrp
                                           << " RSRP Difference: " << (int)rsrpDifference);
 
                    if (rsrpDifference < m_rsrpDifferenceThreshold)
                    {
                        m_cellWeightMap[neighbourCellMeasures->m_cellId]++;
                    }
                }
            }
        }
 
        std::map<uint16_t, uint64_t> metricA;
        for (uint16_t i = 0; i < rbgNum; i++)
        {
            metricA[i] = 0;
        }
 
        for (auto cellIt = m_cellWeightMap.begin(); cellIt != m_cellWeightMap.end(); cellIt++)
        {
            NS_LOG_INFO("CellId: " << m_cellId << " NeighborCellId: " << cellIt->first
                                   << " Weight: " << cellIt->second);
 
            auto rntpIt = m_rntp.find(cellIt->first);
            if (rntpIt == m_rntp.end())
            {
                continue;
            }
 
            for (uint16_t i = 0; i < rbgNum; i++)
            {
                if (rntpIt->second[i])
                {
                    metricA[i] += cellIt->second;
                }
            }
        }
 
        std::vector<uint16_t> sortedRbgByMetric;
        std::multimap<uint64_t, uint16_t> sortedMetricA;
        for (auto it = metricA.begin(); it != metricA.end(); ++it)
        {
            sortedMetricA.insert(std::pair<uint64_t, uint16_t>(it->second, it->first));
        }
 
        for (auto it = sortedMetricA.begin(); it != sortedMetricA.end(); ++it)
        {
            sortedRbgByMetric.push_back(it->second);
        }
 
        for (int i = 0; i < m_edgeRbNum / rbgSize; i++)
        {
            m_dlEdgeRbgMap[sortedRbgByMetric[i]] = true;
        }
 
        for (int i = 0; i < m_edgeRbNum / rbgSize; i++)
        {
            uint32_t rbgIndex = sortedRbgByMetric[i];
            for (int k = 0; k < rbgSize; k++)
            {
                uint32_t rbIndex = rbgSize * rbgIndex + k;
                m_ulEdgeRbgMap[rbIndex] = true;
            }
        }
    }
 
    for (auto ncIt = m_neighborCell.begin(); ncIt != m_neighborCell.end(); ncIt++)
    {
        SendLoadInformation(*ncIt);
    }
}
 
void
LteFfrDistributedAlgorithm::SendLoadInformation(uint16_t targetCellId)
{
    NS_LOG_FUNCTION(this);
 
    NS_LOG_INFO("SendLoadInformation to CellId : " << targetCellId);
 
    std::vector<EpcX2Sap::UlInterferenceOverloadIndicationItem>
        m_currentUlInterferenceOverloadIndicationList;
    std::vector<EpcX2Sap::UlHighInterferenceInformationItem>
        m_currentUlHighInterferenceInformationList;
    EpcX2Sap::RelativeNarrowbandTxBand m_currentRelativeNarrowbandTxBand;
 
    m_currentRelativeNarrowbandTxBand.rntpPerPrbList = m_dlEdgeRbgMap;
 
    EpcX2Sap::CellInformationItem cii;
    cii.sourceCellId = m_cellId;
    cii.ulInterferenceOverloadIndicationList = m_currentUlInterferenceOverloadIndicationList;
    cii.ulHighInterferenceInformationList = m_currentUlHighInterferenceInformationList;
    cii.relativeNarrowbandTxBand = m_currentRelativeNarrowbandTxBand;
 
    EpcX2Sap::LoadInformationParams params;
    params.targetCellId = targetCellId;
    params.cellInformationList.push_back(cii);
 
    m_ffrRrcSapUser->SendLoadInformation(params);
}
 
void
LteFfrDistributedAlgorithm::DoRecvLoadInformation(EpcX2Sap::LoadInformationParams params)
{
    NS_LOG_FUNCTION(this);
    NS_LOG_INFO("CellId: " << m_cellId << " Recv X2 message: LOAD INFORMATION from CellId:"
                           << params.cellInformationList[0].sourceCellId);
 
    if (params.cellInformationList[0].sourceCellId > m_cellId)
    {
        return;
    }
 
    uint16_t neighborCellId = params.cellInformationList[0].sourceCellId;
    auto it = m_rntp.find(neighborCellId);
    if (it != m_rntp.end())
    {
        it->second = params.cellInformationList[0].relativeNarrowbandTxBand.rntpPerPrbList;
    }
    else
    {
        m_rntp.insert(std::pair<uint16_t, std::vector<bool>>(
            neighborCellId,
            params.cellInformationList[0].relativeNarrowbandTxBand.rntpPerPrbList));
    }
}
 
void
LteFfrDistributedAlgorithm::UpdateNeighbourMeasurements(uint16_t rnti,
                                                        uint16_t cellId,
                                                        uint8_t rsrp,
                                                        uint8_t rsrq)
{
    NS_LOG_FUNCTION(this << rnti << cellId << (uint16_t)rsrq);
 
    auto it1 = m_ueMeasures.find(rnti);
 
    if (it1 == m_ueMeasures.end())
    {
        // insert a new UE entry
        MeasurementRow_t row;
        auto ret = m_ueMeasures.insert(std::pair<uint16_t, MeasurementRow_t>(rnti, row));
        NS_ASSERT(ret.second);
        it1 = ret.first;
    }
 
    NS_ASSERT(it1 != m_ueMeasures.end());
    auto it2 = it1->second.find(cellId);
 
    if (it2 != it1->second.end())
    {
        it2->second->m_cellId = cellId;
        it2->second->m_rsrp = rsrp;
        it2->second->m_rsrq = rsrq;
    }
    else
    {
        // insert a new cell entry
        auto cellMeasures = std::make_shared<UeMeasure>();
        cellMeasures->m_cellId = cellId;
        cellMeasures->m_rsrp = rsrp;
        cellMeasures->m_rsrq = rsrq;
        it1->second[cellId] = cellMeasures;
    }
}
 
} // namespace ns3