LTE Capacity Areas

RRM - Capacity Areas and Cell Resource Measurements

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A regular cell is paired with additional logical cell serving the same site sector.

This dependency could be bi-directional – this first cell could play a role of secondary cell as well.

Pcell and SCell have to be collocated with each other


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RL30: Operator specific CQI (LTE418): 21 new QCIs configurable in the range from 128 to 254. Better user and service differentiation for non-GBR services, e.g. bronze, silver and gold users. Operator specific QCIs can be used as well in case of RAN sharing to define a set of QCIs dedicated for each operator


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Live cell data taken 09.07.13,08:00


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Purpose ATB is to provide RB for UL.

It is completely different from DL as there is no Power C in DL but in UL. In RL20:So the less power the UE has, the less RB will be provided in order maintain the SINR at the eNB. Now in RL30 with EULA it has changed due to Shannons theorem, the bandwidth is maintained for longer and the MCS is downgraded first and then the bandwidth is reduced.


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PPUSCH (i) :PUSCH Power in subframe i

PCMAX: max. allowed UE power (23 dBm for class 3)

MPUSCH: number of scheduled RBs (The UE Tx. Power increases proportionally to # of PRBs)

PO_PUSCH(j) = PO_NOMINAL_PUSCH(j) + PO_UE_PUSCH(j)

PL: pathloss [dB] = referenceSignalPower – higher layer filtered RSRP

DTF (i) = 10 log 10 (2MPR Ks – 1) for Ks = 1.25 else 0, MPR = TBS/NRE, NRE : number of RE

Ks defined by deltaMCS-Enabled, UE specific

f(i): TPC (Closed Loop adjustment)

Semi-persistant: j=0 / dynamic scheduling: j=1

PO_NOMINAL_PUSCH(0,1): cell specific (SysInfo)

PO_UE_PUSCH(0,1): UE specific (RRC)

a (0,1) = 0.0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 (partial PL compensation by open loop)

Random access grant: j=2

PO_NOMINAL_PUSCH(2): PO_PRE + DPreamble_Msg3 PO_UE_PUSCH(2) = 0

a (2) = 1.0 (i.e. full PL compensation)


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UL AMC (Adaptive Modulation and Coding)

UL ATB (Adaptive Transmission Bandwidth)


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PHR: Power Headroom Report


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•DL adaptive closed loop MIMO (4x2) supports 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 codeword: 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 detected by eNodeB.

•During Initialization when RRC setup is performed

•No update of valid CSI reports for single layer (RI=1) and dual layer (RI=2) transmissions since a characteristic update 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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CQI Filter:

- For Diversity (Report with Rank = 1) newCQI = WIDEBAND_CQI_Stream1 + DELTA_CQI*rdMimoOllaUsedXX.

-For Spatial Multiplexing (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 provide 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)

Averaging:

mimoCQI(t) = (1-mimoXXCqiAvg)*mimoCQI(t-1) + mimoXXCqiAvg*newCQI.


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2 codewords are the 3GPP max – Ack/Nck and CQI are per codeword – 2 CW gives an optimum overhead.

Even with high order layers (say 8x8) still only 2 CW but we are sending the codewords much faster!


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Perform Attach, then start download by using Jperf with fixed 2 Mbps (1UE). Make sure good radio condition of UE during this test for both CQI and SINR value in order to fulfill MIMO condition.


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Perform Attach, then start download by using Jperf with fixed 2 Mbps (1UE). Make sure good radio condition of UE during this test for both CQI and SINR value. Increase attenuator of Ant1 to be 100dB to simulate TX DIV condition.


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PPUSCH (i) :PUSCH Power in subframe i

PCMAX: max. allowed UE power (23 dBm for class 3)

MPUSCH: number of scheduled RBs (The UE Tx. Power increases

proportionally to # of PRBs)

PO_PUSCH(j) = PO_NOMINAL_PUSCH(j) + PO_UE_PUSCH(j)

PL: pathloss [dB] = referenceSignalPower – higher layer filtered

RSRP

DTF (i) = 10 log 10 (2MPR Ks – 1) for Ks = 1.25 else 0, MPR = TBS/NRE,

NRE : number of RE

Ks defined by deltaMCS-Enabled, UE specific

f(i): TPC (Closed Loop adjustment)

Semi-persistant: j=0 / dynamic scheduling: j=1

PO_NOMINAL_PUSCH(0,1): cell specific (SysInfo)

PO_UE_PUSCH(0,1): UE specific (RRC)

a (0,1) = 0.0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 (partial PL compensation

by open loop)

Random access grant: j=2

PO_NOMINAL_PUSCH(2): PO_PRE + DPreamble_Msg3 PO_UE_PUSCH(2) = 0

a (2) = 1.0 (i.e. full PL compensation)


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LTE786 modifies the receiver at the eNodeB. The blanked PUCCH PRBs are not received, therefore they do not influence the received SINR. This means that the blanked resources do not contribute to the PUCCH RSSI nor SINR statistics, the measurements of the PUSCH RSSI and SINR are performed on the reduced amount of PRBs


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LTE786 modifies the receiver at the eNodeB. The blanked PUCCH PRBs are not received, therefore they do not influence the received SINR. This means that the blanked resources do not contribute to the PUCCH RSSI nor SINR statistics, the measurements of the PUSCH RSSI and SINR are performed on the reduced amount of PRBs


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See also PDCCH link adaption


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Test Scenario : Perform Attach, then start download or upload by using Jperf with fixed 2 Mbps (1UE) then verify PM counters


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M8018C0 The average number of active UEs per eNB. A UE is defined as

"active" if at least a single non-GBR DRB has been succesfully configured for

it.

Updated: The arithmetical average of samples taken from the number of UEs,

having one SRB and at least one DRB established

M8018C1

Description: The maximum number of active UEs per eNB. A UE is defined as

"active" if at least a single non-GBR DRB has been successfully configured for

it.

Updated: The maximum value of the samples of UEs having one SRB and at

least one DRB established during a measurement period.


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(*): 3GPP specifies also other network sharing solutions for LTE, namely

National Roaming and Gateway Core Network however those are Core based

solutions which are out of scope of this presentation


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•Provides PDSCH, PUSCH resources reservation at cell level,

among up to 4 Cell Resource

Groups (CRG) → each CRG represents one or more PLMN Ids

– reservation is realized by assigning a complete TTI to one of the Cell

Resource Groups

– selection of a CRG for scheduling in a TTI is done by Weighted Round

Robin algorithm

according to a configured share

split of resources is configurable by plmnGroupShare parameter

•Introduces also reservation of Admission Control resources:

– Admission Control resources in the cell are distributed between the

Operators

according to configurable share (also plmnGroupShare is used)


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Documents

LTE Capacity Areas