Multiple Input Multiple Output MIMO systems have been widely used in an area of wireless cellular communication system, providing the both increased capacity and reliability. However, the use of multiple antennas in mobile terminals may not be very p
LTE.Full description
Descripción: Mimo
WHAT IS MIMO? WHERE ARE WE USING MIMO? HOW CAN WE USE MIMO AT LTE?
MIMO
Full description
manual mimoDescripción completa
introduction to mimo
mimo feature
Descripción: Massive MIMO
Massive MIMO
MIMO
manual mimoFull description
MIMO Mode Control
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Closed Loop MIMO (8x2): F ast Adaptive Closed Loop MIMO 8x2: SRB1(DCCH) and RBs(DTCH) on PDSCH are transmitted using either Single Stream Downlink Tr ansmit Diversity or Single or Dual Stream MIMO with Closed Loo p spatial multiplexing depending on radio c onditions and UE category; SRB0(CCCH), BCCH and PCCH on PDSCH and all other physical channels are transmitted using Single Stream Downlink Transmit Diversity.
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Transmit Diversity uses two transmit antennas over two symbol periods to transmit two independent data symbols.
A stream of symbols is transmitted ov er two antennas. Each symbol is transmitted with efficiently designed redundancy.
Applicable to control/broadcast channels (PDCCH, PBCH, PHICH, PCFICH), the synchron ization signals (PSS, SSS ), and (sometimes) PDSCH Not applicable to Reference Symbols
•
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DL adaptive closed loop MIMO (4x2) suppo rts Transmit Diversity for 4 antenna ports in Transmission Mode 4 (TM4) and in Transmission Mode 2 (TM2). 3GPP has specified open loop Transmit Diversity using one cod eword: Precoding Feedback and Rank Information is not required!
Transmit Diversity using 4 antenna ports is used whenever there is no valid, complete and consistent Channel State Information available as d etected by eNodeB. During Initialization when RRC setup is perf ormed No update of valid CSI reports for single layer (RI=1) and dual layer (RI=2) transmissions since a ch aracteristic up date time. UE does not send valid reports (e.g. Category 1 UEs). Transmit Diversity for 4 antenna ports is implemented as a combination of SFBC (Space Frequency Block Coding) with FSTD (Frequency Switched Time Diversity).
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SingleTX ==> 0 TXDiv ==> 10 4-way TXDiv ==> 11 Dynamic Open Loop MIMO ==> 30 Closed Loop Mimo ==> 40 Closed Loop MIMO (4x2) ==> 41 Closed Loop MIMO (8x2) ==> 42 Single Stream Beamforming ==> 50 Dual Stream Beamforming ==> 60
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SingleTX ==> 0 TXDiv ==> 10 4-way TXDiv ==> 11 Dynamic Open Loop MIMO ==> 30 Closed Loop Mimo ==> 40 Closed Loop MIMO (4x2) ==> 41 Closed Loop MIMO (8x2) ==> 42 Single Stream Beamforming ==> 50 Dual Stream Beamforming ==> 60
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SingleTX ==> 0 TXDiv ==> 10 4-way TXDiv ==> 11 Dynamic Open Loop MIMO ==> 30 Closed Loop Mimo ==> 40 Closed Loop MIMO (4x2) ==> 41 Closed Loop MIMO (8x2) ==> 42 Single Stream Beamforming ==> 50 Dual Stream Beamforming ==> 60
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CQI Filter: - For Diversity (Report with Rank = 1) newCQI = WIDEBAND_CQI_Stream1 + DELTA_CQI*rdMimoOllaUsedXX. -For Spatial Mu ltiplexing (Report with Rank = 2) newCQI = (WIDEBAND_CQI_Stream1 + WIDEBAND_CQI_Stream2) / 2 + mimoCqiCompSmDivXX + DELTA_CQI*rdMimoOllaUsedXX. During times on inactivity, also the CQI filter shall be slightly modified to pro vide a slow and seamless movement towards Diversity Mode independent from mimoXXCqiAvg settings. For every TTI mimoCQI(t) is decreased by: mimoCQI(t) = rdMimoCqiAgeing *mimoCQI(t-1)
The parameter defines which MIMO mode shall be activated. The choice is twof old: Fast Adaptive MIMO Switching - this is the mode using fast rank selection and cod ebook based precoding, based on reported precoding matrix indicators (PMI) and rank indicator (RI). The reporting of PMI and RI should be optimized to allow fo r low reporting delays. This method allows f or quick adaptation o f MIMO mode used to the reported conditions. Dynamic MIMO Switching - this mode uses filtered RI and CQI (Channel Quality Indicator) reported by the UE, to decide on use of specific MIMO mode. The filtered values are compared to predefined switching thresholds. This method is slower to react to the reported changing conditions, but on the other hand is not affec ted by short term variations
initialization contains Cell ID, nSCID, slot number within a radio frame •
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The decision of TM3 - TM7/TM8 mode switch of UE is based on normalized, compensated and filtered CQI measurements of the UE. The following CQI thresholds should be set: tm7to3CqiTh and tm3to7CqiTh when TM7 is conf igured, tm8to3CqiTh and tm3to8CqiTh when TM8 is configured.
The prohibitTimerTmSwitch timer is applied to avoid too f requent switch. The timer will start when MAC trigger TM switch proc edure. MAC will not trigger another TM switch un til the timer expires. Pre-condition for TM3 - TM7/TM8 switch: - dynamic mode switch is activated by actTmSwitch parameter, - dlMimoMode paramter is set to: 3 (Dynamic Open Lo op MIMO) or 5 (Single stream Beamforming) or 6 (dual stream b eamforming).
- UE is TM7 or T M8 capable and appropriate antenna arrangement of eNodeB's is deployed.
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For all candidate set 2 users their “friend list” should be initialized to NULL. For users which are in TM 8 BF single stream mode and whose corrected CQI >= tm8MuMimoCqiThd a correlation value will be calculated according to the equation where Ui and Uj are the left-side unitary matrices of the SVD decom position of the averaged covariance matrix ofithand jth user, as defined in RRM_LTE_SFS_RRMT.4845. DRX users are excluded. If the correlation for ith and jth UE is less than tm8MuMimoCorrThd, ith will add jth UE to its “friend list” and vice versa. The “friend list” is then ordered in the ascending order, so the resulting MU-MIMO pairs will be the least correlated ones. UEs in TM8 single stream mode of which compensated and averaged CQI is above the tm8MuMimoCqiThdthreshold will be considered for further evaluation to be paired in MU-MIMO mode. Further evaluation consists of checking cro ss-co rrelation between UEs and selecting pair which is least correlated, according to description oftm8MuMimoCorrThd parameter.
