eRAN8.1 Radio & Performance-Interference Handling-CAMC feature introduction.ppt

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HUAWEI TECHNOLOGIES CO., LTD.
Training Document of Intra-
eNodeB Coordinated
AMC(CAMC)
Author/ Email: Author's name/Author's email
Version: V1.0(20YYMMDD)

 Roadmap
 Introduction
 Benefit
 When to use
 Deploying
 Reference
 FAQ
content

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential 3
CAMC Solution Roadmap
eRAN8.1
eRAN7.0 eRAN8.0
eRAN6.0
Intra-eNodeB Coordinated
AMC（FDD only）
Basic AMC
Basic AMC
Basic AMC
2013Q2 2014Q2 2014Q4 2015Q2

Introduction
 Intra-eNodeB Coordinated Uplink AMC（CAMC）estimates the
interferce from neighbor cells of coordinating cell set
by the scheduling information shared in coordinating set
，helping improve the accuracy of the estimated SINR and
the selected MCS。
 Coordinating cell set（CAMC set）
 Cells CAMC set can exchange scheduling information。
CAMC can only predict interference change in CAMC
set. A CAMC set includes a maximum of three cells.。
Cells in CAMC set have same frequency, in same
board, have same LocationName, and the same
settings for the UL CoMP feature。
 Users with strong interference
 CAMC measures channel information on the interfered
cell caused by the users with strong interference
from neighbor cells in the CAMC set to for interfere
prediction. CAMC determines the users with strong
interference based on event A3 reported by the UE.
 Scheduling information
 Includes the positions of RBs to be allocated for
each UE and the UE's transmit power.
 Background interference
 The background interference is the filter value of
interference except the strong interference. The
predicted interference is the sum of the predicted
strong interference and the background interference.
Page4
PIC1：CAMC SINR prediction principle
PIC2：strong and background interference

Introduction
 SINR prediction
 CAMC predicts the Scheduled user’s RBSINR of each
RB, and combines RBSINR to the user’s bandwidth
SINR.
 MCS determination
 The MCS selection process of CAMC is same from
basic AMC. The only difference is CAMC uses the
predicted bandwidth SINR while basic AMC uses the
measured SINR.
 CAMC is applicable only to dynamic scheduling in
initial transmissions, CAMC does not take effect
for the following users
 semi-persistent scheduling users
 TTI Bundling users
 Users with the QCI of 1 (VoIP users）
 MU-MIMO users
 high-speed users(CAMC cannot accurately track
channel changes)
 CoMP users whoes coordinating cell is not in CAMC
set, and 3 celles CoMP users
Page5
PIC3：CAMC SINR prediction principle (2)
 Event A3 of CAMC
 The offset of CAMC Event A3 is configured by
CellUlSchAlgo. UlCamcDlRsrpOffset，other
parameters of Event A3 are shared from ICIC
feature.
 If the Ul CoMP feature is enabled, CAMC uses
Event A3 of CoMP, and
CellUlSchAlgo.UlCamcDlRsrpOffset is disabled

Benefit
 Increasing Ul throughput
 0~5% Cell average Ul throughput gain
 0~10% UE average Ul perceived
throughput gain
 In serval extreme cases, the gain can
approach more than 20%
 Factors that affect CAMC performance
 The proportion of strong interference
in CAMC set to the total interference
 CAMC user proportion
CF (GHz) ISD (meters)
BW
(MHz)
Speed
(km/h)
2.0 500 10 3
Traffic
name
Transport
protocol
file
size(byte
s)
Interval
time(s)
user
ratio
small TCP 1500 3 80%
big TCP 300000 30 20%

When to use
 Recommended Scenarios
CAMC is applied to the interference-limited scenarios where users are moving at low
speeds. The recommended scenarios are densely populated urban areas, such as commercial
streets, office buildings, residential areas, and stadiums.
 Site Type
 Three-sector sites are recommended。
 Load
 It is recommended that the RB usage be more than 20% in the feature deployment area
 ISD
 It is recommended that the average inter-site distance in the feature deployment area
be at least 500 m.
 proportion of high-speed users
 It is recommended that the proportion of high-speed users (moving speed greater than 30
km/h) be less than or equal to 50%.

When to use
 Not Recommended Scenarios
 Site with more than 3 sectors
 A CAMC set supports three cells at most. If there are more than three sectors in a
site, CAMC will generate 2 or more CAMC sets, which may decrease CAMC performance.
 GL refarming Bufferzone
 CAMC can not predict interference from other systems。
 Areas where high-speed users take the majority
 It is good practice not to deploy CAMC at high-speed railways, freeways, trunk roads,
and tunnels.
 Extremely small ISD
 If the average inter-site distance is less than 200 m, inter-site interference
significantly affects the SINR, resulting in decreased CAMC performance.
 Mutually Exclusive Features
 Multi-RRU Cell（SFN/ASFN）
 High Speed/Ultra High Speed Mobility
 Carrier Aggregation for Uplink 2CC
 UL 4-Antenna Receive Diversity

Deploying
 Hardware Requirements
 Base station type: Macro base stations
 Baseband processing unit type: UBBPd board
 Antenna type: 2R only
 Parameter Configure Requirements
 Cell.MultiRruCellFlag should be set to BOOLEAN_FALSE。
 Cell.HighSpeedFlag should be set to LOW_SPEED。
 Cell.TxRxMode should be set to 1T2R or 2T2R。
 CaUl2CCSwitch under CaMgtCfg.CellCaAlgoSwitch should be set to Off。
 Cell.CellRadius can not greater than 30000。
 CellUlSchAlgo.UlHoppingType shouble be set to Hopping_OFF。
 PuschDtxSwitch under CellAlgoSwitch.UlSchSwitch should be set to
PuschDtxSwitch ON。
 CellUlschAlgo.DopMeasLevel should be set to CLASS_1。
 Parameter settings of UL CoMP should be the same for all cells served by the
same feature deployment site.

Deploying
 License
 The operator has purchased and activated the license for the feature listed
below
 Network Connection Requirements
 The average ISD in the feature deployment area must be at least 200 m and
the cell radius for CAMC deployment must be less than 30 km.
Feature ID Feature Name License Discription NE dimension
LOFD-
081206
Intra-eNodeB
Coordinated Uplink
AMC
Intra-eNodeB
Coordinated Uplink
AMC(per cell)
eNode
B
Per cell
 The same frequency cells of one site
should be connected to the same
baseband processing unit, and CAMC is
applied only to three-sector sites
(recommended configuration).
 CAMC is a coordinating feature. This
means that CAMC can yield the
expected improvements only when it is
enabled for all cells in a site.

Deploying
 Data Preparation
 Activation
 Ensure that all requirements of hardware，parameter configure，license，and
network connection are met.
 Configure the LocationName for each sector. LocationName must be the same for
sectors of the same physical site and different for sectors of different sites.
 Set the UlCamcDlRsrpOffset if UL CoMP has not been enabled.（Normally，this
parameter can use the default value）
 Set the UlCamcSw under CamcSwitch to enable Ul CAMC。
NOTE：After LocationName is configured for the sectors served by a baseband processing unit, all of
the cells must be deactivated and separately activated again. In this way, CAMC sets can be allocated
correctly.
ParameterName Parameter ID Setting Notes
Location Name Sector.LocationNam
e
Indicates the location name of the eNodeB. This parameter
determines the CAMC sets.
Local Cell ID CellAlgoSwitch.Loc
alCellId
This parameter specifies the local identity of a cell. Ensure that
this parameter has been set in the related Cell MO.
Coordinated AMC
Switch
CellAlgoSwitch.Ca
mcSwitch
UlCamcSw under this parameter specifies whether to enable
the UL CAMC function.
Local Cell ID CellUlschAlgo.Local
CellId
This parameter specifies the local identity of a cell. Ensure that
this parameter has been set in the related Cell MO.
Ul Coordinated AMC
Dl RSRP Offset
CellUlschAlgo.UlCa
mcDlRsrpOffset
Indicates the downlink RSRP difference threshold of CAMC
event A3, used for CAMC to determine the users of strong
interference.

Deploying
 MML Example
 Modifying sector LocationName configurations
MOD SECTOR:SECTORID=0,LOCATIONNAME="location137";
 Modifying the offset of Event A3 to -10 dB for CAMC（the unit is 0.5dB）
MOD CELLULSCHALGO:LOCALCELLID=0,ULCAMCDLRSRPOFFSET=-20;
 Enabling
MOD CELLALGOSWITCH:LOCALCELLID=0,CAMCSWITCH=UlCamcSw-1;
 Observation
Method Procedure Result
LMT Run the DSP CELLULCAMCCLUSTER
command to view the command output.
This command showes the CAMC set of the cell. If
the cell list is not empty, CAMC has taken effect
Counter View the value of L.ULCAMC.User.Avg. This counter shows the average UE number that
CAMC is active. If the counter value is not 0, CAMC
has taken effect .

Reference
 Counter
KPI Name Description
L.Thrp.bits.UL Total uplink traffic volume for PDCP PDUs in a cell
L.Thrp.Time.UL Total receive duration of uplink PDCP PDUs in a cell
L.Thrp.Time.Cell.UL.HighPrecisio
n
Total duration of uplink data transmission in a cell (with the
precision of 1 ms)
L.Thrp.bits.UE.UL.LastTTI Traffic volume of uplink PDCP PDUs sent in the last TTI before
the UE buffer is empty
L.Thrp.Time.UE.UL.RmvLastTTI Uplink data transmit duration except the last TTI before the UE
buffer is empty
L.Thrp.UL.BitRate.Samp.Index0~
9
Number of samples with the uplink throughput ranging within
index 0~9
L.ChMeas.PUSCH.MCS.0 ~31 Number of times MCS index 0~31 is scheduled on the PUSCH

Reference
 Parameters related to the reporting of event A3
Parameter
Name
Parameter ID Parameter Description
Time to
Trigger
CellMcPara.TimeT
oTrigger
Indicates the time-to-trigger for reporting event A3. When detecting that the signal quality in the serving
cell and that in at least one neighboring cell meet the entering condition, the UE does not report the
event to the eNodeB immediately. Instead, the UE reports the event only when the signal quality
continuously meets the entering condition during the time-to-trigger.
Max Report
Cell Number
CellMcPara.MaxR
eportCells
Indicates the maximum number of cells to be included in each measurement report after event A3 is
triggered. For details, see 3GPP TS 36.331.
Report
Amount
CellMcPara.Report
Amount
Indicates the number of periodic measurement reports that are sent after event A3 is triggered. For
details, see 3GPP TS 36.331.
Trigger
Quantity
CellMcPara.Trigge
rQuantity
Indicates whether event A3 is triggered based on RSRP or RSRQ values. The measured RSRP values
are stable, slightly varying with the load, and therefore there is little signal fluctuation. The measured
RSRQ values vary with the load and are likely to reflect the signal quality of the cell in real time.
Report
Quantity
CellMcPara.Report
Quantity
Indicates the type of the value to be included in the measurement report after event A3 is triggered,
which can be set to SAME_AS_TRIG_QUAN(Same as Trig Quan) or BOTH(Both). The value
SAME_AS_TRIG_QUAN(Same as Trig Quan) indicates that the type of the value to be included in the
measurement report is the same as that specified by the TriggerQuantity parameter. The value
BOTH(Both) indicates that both RSRP and RSRQ values are included in the measurement report. The
measured RSRP values are stable, slightly varying with the load, and therefore there is little signal
fluctuation. The measured RSRQ values vary with the load and are likely to reflect the signal quality of
the cell in real time. For details, see 3GPP TS 36.331.
Report
Interval
CellMcPara.Report
Interval
Indicates the interval between periodic measurement reports that are sent after event A3 is triggered.
For details, see 3GPP TS 36.331.
Hysteresis CellMcPara.Hyster
esis
Indicates the hysteresis for reporting event A3. This parameter is used to prevent frequent entering or
leaving of event A3 and decision errors due to radio signal fluctuation.

FAQ
 null

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