From 6a44c41e2afdb3af2b52f5502829f7d4051e76be Mon Sep 17 00:00:00 2001 From: Marco Miozzo Date: Wed, 20 Mar 2013 12:26:43 +0100 Subject: [PATCH] Update PHY Support ofr UE Measurement design doc --- src/lte/doc/source/lte-design.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/lte/doc/source/lte-design.rst b/src/lte/doc/source/lte-design.rst index e98130bf0..83ce6bcd7 100644 --- a/src/lte/doc/source/lte-design.rst +++ b/src/lte/doc/source/lte-design.rst @@ -784,7 +784,7 @@ According to [TS36214]_, the UE has to report a set of measurements of the eNBs The UE has to report the measurements jointly with the physical cell identity (PCI) of the cell. Both measurements are performed during the reception of the RS, while the PCI is obtained with the Primary Synchronization Signal (PSS). The PSS is sent by the eNB each 5 subframes and in detail in the subframes 1 and 6. According to [TS36133]_ sections 9.1.4 and 9.1.7, RSRP is reported by PHY lauer in dBm while RSRQ in dB. The values of RSRP and RSRQ are provided to higher layers through the C-PHY SAP (by means of ``UeMeasurementsParameters`` struct) every 200 ms as defined in [TS36331]_ by averaging the all the measurements collected during the last window slot. The periodicity of reporting can be adjusted for research purposes by means of ``LteUePhy::UeMeasurementsFilterPeriod`` attribute. -Considering to the constraints of the PHY reception chain implementation and in order to maintain the level of computational complexity low, only RSRP can be directly obtained. This is due to the fact that ``LteInterference`` is designed for evaluating the interference only respect to the signal of the eNB attached to. For what concern RSRQ, it can be extracted by the current information available of the cell and the RSRP as detailed in the following: +Considering to the constraints of the PHY reception chain implementation and in order to maintain the level of computational complexity low, only RSRP can be directly obtained for all the cells. This is due to the fact that ``LteSpectrumPhy`` is designed for evaluating the interference only respect to the signal of the serving eNB. This implies that the PHY layer is otimized for managing the power signals information with the serving eNB as a reference. However, RSRP and RSRQ can be extracted by the current information available of the serving cell :math:`j` as detailed in the following: .. math:: @@ -794,7 +794,7 @@ Considering to the constraints of the PHY reception chain implementation and in RSRQ_i^j = K \times RSRP_i / RSSI_i^j -wherem :math:`RSRP_i` is the RSRP of cell :math:`i`, :math:`P_i(k)` is the power perceived at the RB :math:`k`, :math:`K` is the total number of RBs, :math:`RSSI_i^j` is the RSSI of the cell :math:`i` when the UE is attached to :math:`j`, :math:`I_j(k)` is the total interference perceived by UE when attached to cell :math:`i` (obtained by the ``LteInterferencePowerChunkProcessor``) in the RB :math:`k`, :math:`P_j(k)` is the power of the perceived of cell :math:`j` in the RB :math:`k` and :math:`N` is the power noise spectral density. The sample is considered as valid in case of the RSRQ evaluated is above the ``LteUePhy::RsrqUeMeasThreshold`` attribute. +wherem :math:`RSRP_i` is the RSRP of the neighbor cell :math:`i`, :math:`P_i(k)` is the power perceived at the RB :math:`k`, :math:`K` is the total number of RBs, :math:`RSSI_i^j` is the RSSI of the neighbor cell :math:`i` when the UE is attached to cell :math:`j`, :math:`I_j(k)` is the total interference perceived by UE when attached to cell :math:`i` (obtained by the ``LteInterferencePowerChunkProcessor``) in the RB :math:`k`, :math:`P_j(k)` is the power of the perceived of cell :math:`j` in the RB :math:`k` and :math:`N` is the power noise spectral density. The sample is considered as valid in case of the RSRQ evaluated is above the ``LteUePhy::RsrqUeMeasThreshold`` attribute. .. only:: latex