FDD LTE Radio Parameters Description Guide

8/10/2019 FDD LTE Radio Parameters Description Guide

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Contents

Basic Cell Parameters

Cell Selection and Reselection Parameters

Random Access Parameters

Paging Parameters

Measurement Parameters

Handoff Parameters


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Physical Cell ID

Parameter Description

This parameter identifies a unique physical cell that can be included in only one cell

group. A system provides a total number of 504 physical cell IDs, which are classified

into 168 groups, each group containing three unique IDs.

When configuring this parameter, ensure that physical cell IDs should be space

multiplexing as planned.

Value Range and Step Length

Value Range: Int (0, 1, , 503)

Default Value: 0

Configuration Principles A physical cell ID should be uniquely assigned for the same frequency point in the same

geographical area or in different PLMNs (especially at the cell edge).

To separate the primary synchronous channels among adjacent cells, ZTE recommends

you set them to 0, 1, and 2because a macro eNodeB consists of three cells.


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CP Selection for Physical Channel


This parameter indicates the cyclic prefix (CP) of the OFDM symbol, which is used to

determine the total number of OFDM symbols within one slot. When this parameter is set to

normal cyclic prefix, it implies that seven OFDM symbols are available within one slot.

When this parameter is set to extended cyclic prefix, it implies that six OFDM symbols are

available within one slot.

he


Value Range: Enum (normal cyclic prefix, extended cyclic prefix)

Default Value: normal cyclic prefix

Configuration Principles

The CP is dependent on the multipath delay of a radio channel. In the presence of either

a large multipath delay or a large cell radius, extended cyclic prefixis recommended.

The extended cyclic prefixoption can suppress radio interference caused by multipath

delay, but suffering from lower system capacity; and therefore it is recommended that

you set it to the default value.


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Downlink System Bandwidth


This parameter indicates the system bandwidth in the downlink, which is used to

determine the frequency domain location of the downlink physical channel as well as

downlink frequency allocation.


Value Range: Enum (6, 15, 25, 50, 75, 100) Unit: RB

Default Value: 100


This parameter is dependent on the frequency bandwidth acquired by a mobileoperator. The downlink system bandwidth can either be identical to or different from

the uplink system bandwidth.

Modifying this parameter can have an impact on downlink resource allocation.


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Uplink System Bandwidth


This parameter indicates the system bandwidth in the uplink, which is used to determine

the frequency domain location of the uplink physical channel as well as uplink frequency

allocation.


Value Range: Enum (6, 15, 25, 50, 75, 100) Unit: RB

Default Value: 100


This parameter is dependent on the frequency bandwidth acquired by a mobileoperator. The downlink system bandwidth can either be identical to or different from

the uplink system bandwidth.

Modifying this parameter can have an impact on uplink resource allocation.


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Cell Max Transmit Power


This parameter specifies the maximum available transmit power.


Value Range: Float (0, , 50) Step: 0.1 Unit: dBm

Default Value: 43


The default value is intended to be used in the following environment:Object Value Object Value

Site Spacing 800 m Frequency Spectrum 2.6 G

BS Height 25 m Antenna Gain 18 dBiMaximum Transmit Power (UE) 24 dBm Body/Path Loss 3 dB

Maximum Uplink Throughput at Cell

Edge (UE Dynamic Scheduling)

128 kbps Shadow Fade Margin 10 dB

Maximum Downlink Throughput 800 kbps Penetration Loss 20 dB

Maximum Throughput (UE Semi-

Dynamic Scheduling)

32 kbps


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Cell Transmit Power


This parameter specifies the used transmit power.


Value Range: Float (0, , 50) Step: 0.1 Unit: dBm

Default Value: 43


For the environment information about the use of the default value, see page 7

(Cell Max Transmit Power).

This parameter is dependent on the cell radius and the planned downlinkthroughput at the cell edge. The greater the cell radius or the planned downlink

throughput at the cell edge, the greater the value of this parameter is required.


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Cell-specific Reference Signals Power


This parameter specifies the absolute power value of the cell reference signal for each

resource element.


Value Range: Int (-60, , 50) Unit: dBm Default Value: 6


For the environment information about the use of the default value, see page 7 (Cell Max

Transmit Power).

This parameter is dependent on cell coverage. The greater the cell coverage, the greaterthe value of this parameter is required. This parameter should be used for ensuring cell

coverage while achieving the maximum power.

A reference signal power value should be properly tuned in accordance with the required

power of the downlink control channel at the cell edge based on the link estimation

calculated by using such radio parameters as cell type, cell radius, and antenna height.


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Switch for User Inactivity


This parameter specifies whether to enable the USER INACTIVITY feature.

Parameter Location in the OMC

To find this parameter, choose Views> Configuration Management > LTENE> Global

Parameters of eNodeB in the OMC.


Value Range: Enum (close, open)

Default Value: close


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User Inactivity Timer


This parameter specifies the time interval at which the UE is in inactive state.

Parameter Location in the OMC

To find this parameter, choose Views> Configuration Management > LTENE> Global

Parameters of eNodeB in the OMC.


Value Range: one second to 30 days

Default Value: 10 minutes


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Pmax


This parameter specifies the maximum transmit power allowed for the UE configured on

the higher layer.


Value Range: Int (-30, , 33) Unit: dBm

Default Value: 23


For the environment information about the use of the default value, see page 7

(Cell Max Transmit Power).

This parameter is dependent on the cell radius and the planned uplink throughput

at the cell edge. The greater the cell radius or the planned uplink throughput at the

cell edge, the greater the value of this parameter is required.


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Contents




Paging Parameters


Handoff Parameters


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Q_RxLevMinOffset


This parameter indicates the offset of the minimum required received power level of

the cell which satisfies the condition of being selected or reselected by UE. It will

affect the minimum required received power level in the cell. Range of the

parameter is actual value which equals to double of value in 36.331.


int (2, .., .16) step 2 unit dB

Default value: 2


Offset to the signalled Qrxlevmin taken into account in the Srxlev evaluation as a

result of a periodic search for a higher priority PLMN while camped normally in a

VPLMN.For normal cases, the default value is recommended. For some higher

priority PLMN scenario, the value could be greater than the default value.

(Depending on the coverage, loading, requirements of the high priority PLMN.


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Qhyst


This parameter indicates the hysteresis value for cells. In cell-ranking criterion R of

cell reselection, the R value of serving cell equals to the measured value plus the

hysteresis value. For detail description please refer to TS 36.304.

Value Range and Step Length int (0, 1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24)

Default value: 3


This specifies the hysteresis value for ranking criteria of serving cell. If a cell is

ranked as the best cell the UE shall perform cell reselection to that cell.The default

value is recommende to be used in normal cases.The greater is the value of this

parameter, the harder to fullfill the reselection process.


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ThresholdServing_Low


This parameter specifies the low threshold for the serving carrier when the low priority carrier or

system is selected and the following conditions can be fulfilled:

The cell without any high priority carrier or system can meet the cell reselection criteria for

escalating to a higher priority.

When the Treselectionthreshold is not exceeded, SServingCellis smaller than

byThreshSvrLow while SnonServingCell,x(low priority carrier or system) is greater than

byThreshSvrLow (including inter-frequency and inter-system).

The UE has resided in the serving cell for more than one second.


Value Range: Int (0, , 62) Step: 2 Unit: dB

Default Value: 0


This threshold is used when the UE evaluates and reselects a low-priority E-UTRAN or RAT

frequency point as the serving frequency point.

TheSServingCellthreshold is applicable to the serving cell. When this SServingCellthreshold

is reached, it is likely that the cell reselection will be triggered.


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S_Intrasearch


This parameter specifies the intra-frequency measurement trigger threshold for cell selection. The UE

is used to determine whether to implement the intra-frequency measurement.


Value Range: Int (0, ..., 62) Step: 2 Unit: dB

Default Value: 14


When the quality of the serving cell is greater than the S_intrasearchvalue, the UE does not

implement the intra-frequency measurement.

When the quality of the serving cell is equal to or smaller than the S_intrasearchvalue, the UE

implements the intra-frequency measurement.

Setting this parameter to a too small value will cause the UE to fail in implementing the intra-

frequency measurement in a timely manner, and thus failing to reselect an adjacent intra-

frequency cell.

Setting this parameter to a too large value will cause the UE to waste battery resources.


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IntraQ_OffsetCell


This parameter specifies the intra-frequency cell reselection offset that is used to tune

adjacent cells using the R criteria, and therefore it is comparable to the Qhystparameter.


Value Range: Enum (-24,-22,-20, -18, -16, -14, -12, -10, -8, -6, -5, -4, -3, -2, -1, 0, 1,2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24) Unit: dB

Default Value: 0


Do not set this parameter to a too large value. Otherwise, the serving cell is very poor,

but cannot be reselected.


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Intra_Pmax


This parameter specifies the maximum available uplink transmit power, depending on

the UE type. It is used for intra-frequency cell reselection. If this parameter is void, the

UE will follow its own capabilities for further handling.

Value Range and Step Length Value Range: Int (-30..33) Unit: dBm

Default Value: 23


For more information, see page 12 (Pmax). The Intra_Pmaxparameter is

dependent on the configuration data of adjacent cells.

Modifying this parameter can have an impact on SIB3.


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The Timer for Cell Reselection in Inter-frequency E-UTRAN


This parameter represents an inter-frequency cell reselection timer. Within the

TreselectionInterEUTRAN, a new E-UTRAN inter-frequency cell, which performs better

than the serving cell using the R criteria, can be reselected as a new serving cell.

Value Range and Step Length Value Range: Int (0, , 7) Unit: s

Default Value: 1


This parameter is comparable to the tRslIntraEutra parameter, which represents

an intra-frequency cell reselection timer. You can set it to a value that is equal to or

slightly greater than the tRslIntraEutra parameter.



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Intra-frequency Cell Reselection Priority


This parameter specifies the priority for intra-frequency cell reselection. The smaller the value

of this parameter, the lower the cell reselection priority is.


Value Range: Int (0, , 7) Step: 1 Default Value: 0


The UE can implement the cell reselection process for only E-UTRAN frequency points

and inter-system frequency points that have acquired the priority based on the

corresponding system information. However, the UE will never consider any blacklisted

cell as a candidate for cell reselection.

If an adjacent cell has higher priority than the serving cell during the cell reselection

measurement, the UE will unconditionally enable the intra-system or inter-system

measurement. A higher priority cell takes precedence during the cell reselection process.



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Intra-frequency Neighbour CSG Cell Physical Identity Range


This parameter specifies the total number of CSG cells in an intra-frequency neighboring

CSG cell group.


Value Range: Enum (4, 8, 12, 16, 24, 32, 48, 64, 84, 96, 128, 168, 252, 504)

Default Value: 4


If this parameter is void, it implies that only one CSG neighboring cell is present.

The physical identify of this CSG cell is represented by the

intraFreqCSGPhyCellId_lowest parameter.



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Contents




Paging Parameters


Handoff Parameters


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Key random access parameters include:

Cell High-Speed Attribute

Ncs Used to Generate PRACH Preamble

Logical Root Sequence Start Number Used to Generate PRACH Preamble

Number of Non-dedicated Random Access Preambles

Size of Random Access Preambles Group A

Threshold of Selecting Preamble Group

Message Power Offset for Group B

the Initial RB Number for Random Access Preambles

PRACH Configuration Index PRACH

Initial Power for Preamble of PRACH

Power Ramping Step for PRACH

Max retransmit number for PRACH

TTI Window Size for PRACH Response

Max Number of Messages HARQ Transmissions Message 3

MAC Contention Resolution Timer

Dedicated Preamble Life Time


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Cell Radius

Preamble

Format

RadiusThrdLR

a (km)

RadiusThrdH

Ra (km)

0 0 14

1 29 77

2 14 29

3 77 100

Cell High-Speed Attribute

Default Value: Not high speed cellValue Range: Enum {Not high speed cell, high speed cell}


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MTDT

Preamble

format

MaxCellRadius

(km)

0 103.2768 97.0176 5.2 14.545367

1 685.3824 516.384 16.7 77.418191

2 203.424 197.1648 16.7 27.994603

3 685.3824 716.6784 16.7 100.25223

CPTGPT MTDT

67.6/),min( GPMTDCPcell TTTR

SequenceCP

CPT SEQT

Guard Pd

GPT

RTDT MTDT

One slot

s24576 T

s3168 T

s21024 T

sT15360 sT15360 sT15360 sT15360

s6240 T

s24576 T s15840 T

s6080 Ts24576 T s24576 T

s21024 T s24576 T s24576 T

sT15360 sT15360

s24576 T

s21993 T

s2976 T

One subframe (1ms)

Format

0

Format

1Format

2

Format

3

Cell Radius (Supported):

015 km

3077 km

1530 km

77100 km


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for Preamble Generation (Preamble Formats 0-3)CSN

Ncs

configurati

on

Low and

Medium

Speed Ncs

(


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Logical root

sequence number

Physical root sequence number u

(in increasing order of the corresponding logical sequence number)

023 129, 710, 140, 699, 120, 719, 210, 629, 168, 671, 84, 755, 105, 734, 93, 746, 70, 769, 60, 779

2, 837, 1, 838

2429 56, 783, 112, 727, 148, 691

204-263 152, 687, 144, 695, 134, 705, 138, 701, 199, 640, 162, 677, 176, 663, 119

720, 158, 681, 164, 675, 174, 665, 171, 668, 170, 669, 87, 752, 169, 670, 88, 751, 107, 732, 81, 758, 82, 757, 100, 739, 98, 741,

71, 768, 59, 780, 65, 774, 50, 789, 49, 790, 26, 813, 17, 822, 13, 826, 6, 833

328383 225, 614, 224, 615, 221, 618, 220, 619, 127, 712, 147, 692, 124, 715, 193, 646, 205, 634, 206, 633, 116, 723, 160, 679, 186,

653, 167, 672, 79, 760, 85, 754, 77, 762, 92, 747, 58, 781, 62, 777, 69, 770, 54, 785, 36, 803, 32, 807, 25, 814, 18, 821, 11, 828,

4, 835

384455 3, 836, 19, 820, 22, 817, 41, 798, 38, 801, 44, 795, 52, 787, 45, 794, 63, 776, 67, 772, 72, 767, 76, 763, 94, 745, 102, 737, 90,

749, 109, 730, 165, 674, 111, 728, 209, 630, 204, 635, 117, 722, 188, 651, 159, 680, 198, 641, 113, 726, 183, 656, 180, 659,

177, 662, 196, 643, 155, 684, 214, 625, 126, 713, 131, 708, 219, 620, 222, 617, 226, 613

820-837 336, 503, 305, 534, 373, 466, 280, 559, 279, 560, 419, 420, 240, 599, 258, 581, 229, 610

Root Zadoff-Chu Sequence Order for Preamble Format 03


Logical Root Sequence Start Number Used to Generate PRACH

Value Range: [0, ..., 837] Default Value: N/A


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q Preamble Group B

64 Preambles

n Preamble Dedicated m Preamble Non-dedicated

p Preamble Group A

Number of Non-dedicated

Random Access Preambles

Default Value: 60

Value Range: Enum {

4, 8, 12, 16, 20, 24, 28, 32, 36,

40, 44, 48, 52, 56, 60, 64}

Size of Random Access

Preambles Group ADefault Value: 56

Value Range: Enum {

4, 8, 12, 16, 20, 24, 28, 32, 36,

40, 44, 48, 52, 56, 60}

Threshold of Selecting

Preamble GroupDefault Value: 144 bit

Value Range: Enum {

56, 144, 208, 256} bit

Message Power Offset for

Group BDefault Value: 0 dB

Value Range: Enum {

-infinity, 0, 5, 8, 10, 12, 15,

18} dB


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47

PRB

n

48PRBn

49PRBn

Specifical

subframe

Uplink

subframe

7PRBn

0

PRB

n

1PRBn

2PRBn

8PRBn

...

SR

PUSCH

DMRS

CCR#0 data: CQI

CCR#2 data: ACK/NACK

CCR#1 data: CQI

CCR#3 data: ACK/NACK

CCR#0 pilot: CQI

CCR#2 pilot: ACK/NACK

CCR#1 pilot: CQI

CCR#3 pilot: ACK/NACKRACH

Initial RB Number for

Random Access Preambles

Value Range: [0, , 94]

Default Value: Void

PRACH Configuration Index

Value Range: [0, , 63]Default Value: 3

nPRB=2

60 ULRB NnRA

PRBoffset


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The number of randomaccessing based oncontention resolution

Probability of RAcolliding

Physical Cell ID

Frame Structure Type 1 Random Access Configuration for Preamble Format 0

PRACH Configuration Index Preamble Format System frame number Sub-frame number

0 0 Even 1

1 0 Even 4

2 0 Even 7

3 0 Any 1

4 0 Any 4

5 0 Any 7

6 0 Any 1, 6

7 0 Any 2 ,7

8 0 Any 3, 8

9 0 Any 1, 4, 7

10 0 Any 2, 5, 8

11 0 Any 3, 6, 9

12 0 Any 0, 2, 4, 6, 8

13 0 Any 1, 3, 5, 7, 9

14 0 Any 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

15 0 Even 9

Number of

slots per

second

Prach Configuration Index

Preamble Format 0 Preamble Format 1 Preamble Format 2 Preamble Format 3

50 0, 1, 2, 15 16, 17, 18, 31 32, 33, 34, 47 48, 49, 50, 63

100 3, 4, 5 19, 20, 21 35, 36, 37 51, 52, 53

200 6, 7, 8 22, 23, 24 38, 39, 40 54, 55, 56

300 9, 10, 11 25, 26, 27 41, 42, 43 57, 58, 59

500 12, 13 28, 29 44, 45 N/A

1000 14 N/A N/A N/A


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Ramping Power (Configurable)

T1 T2 T3 T4 T5 T6

P0

P0 +deta

P

P0 +2detaP

P0 +3detaP

P0 +5detaP

Initial Power for Preamble of PRACH

Default Value: -110 dBm

Value Range: Enum {

-120,-118,-116,-114-112-110-108-

106-104-102-100-98-96-94-92-90} dBm

Power Ramping Step for PRACH

Default Value: 2 dB

Value Range: Enum {0, 2, 4, 6} dB

Max retransmit number for PRACH

Default Value: 8

Value Range: Enum {3, 4, 5, 6, 7, 8, 10, 20,

50, 100, 200}

PRACH = min{PcMAX, PREAMBLE_RECEIVED_TARGET_POWER + PL}

PcMAX = Plmax + Pinitial + (N-1) * Step



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Msg4: Contention Resolution

Msg3: Scheduled Transmission

Msg2: Random Access Response

Msg1: Random Access Preamble

UE eNodeBTTI Window Size for PRACH

Response

Default Value: 10ms

Value Range: Enum {

2, 3, 4, 5, 6, 7, 8, 10} ms

Max Number of Messages

HARQ Transmissions

Default Value: 3

MAC Contention Resolution

Timer

Default Value: 48sf

Value Range: Enum {

8, 16, 24, 32, 40, 48, 56, 64} sf

Value Range: [1, , 8]


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Msg3: Contention Requirement

Data or Padding

Msg2: RA Response

Sent on PDSCH

Msg1: Random Access Preamble

Dedicated Preamble

Msg0: PDCCH Order

Dedicated Preamble ID, Mask Index

UEeNodeB

0

1

2

3

Dedicated Preamble Life Time

Default Value: 100 ms

Value Range: [0, , 100] ms


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Contents




Paging Parameters


Handoff Parameters


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Paging Parameters

DRX Cycle for Paging


This parameter specifies the DRX cycle for paging purposes.


Value Range: Enum (32, 64, 128, 256) Unit: Sub-frame

Default Value: 128


When the UE is in idle state but the DRX is being used, the UE needs to monitor a

P-RNTI in a paging occasion every DRX cycle.

Modifying this parameter can have an impact on other UEs being in idle state.


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Paging Parameters

nB used to derive the Paging Frame and Paging Occasion


This parameter specifies the nB that is used to derive the paging frame and paging

occasion, as defined in TS36.304.


Value Range: Enum (4T, 2T, T, 1/2T, 1/4T, 1/8T, 1/16T, 1/32T) Default Value: T


This parameter is an integer multiplied by T.

T represents a paging cycle. For example, 2T indicates two paging cycles and 4T

indicates four paging cycles.


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Paging Parameters

The Parameter to Determine BCCH Modification Period


This parameter is used to determine the BCCH modification period (BCCH modification

period = N * DRX cycle length for paging). The purpose of this constraint is to ensure

that all the UEs being in idle state can monitor the system broadcast change message.

Value Range and Step Length Value Range: Enum (2, 4, 8, 16)

Default Value: 4


The greater this parameter, the longer the system message is updated. This can

have an adverse impact on real-time message update.

The smaller this parameter, the shorter the system message is updated. This can

cause the UE to monitor the systemInfoValueTagmore frequently.


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Contents




Paging Parameters


Handoff Parameters


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Intra-Frequency Trigger Quantity


This parameter specifies the measured value that is used for triggering an event.


Value Range: Enum (0, 1) 0=RSRP, 1=RSRQ

Default Value: 0


RSRP is short for reference signal received power.

RSRQ is short for reference signal received quality.

When the UE detects that this parameter meets the threshold, it will trigger an intra-frequency cell measurement event.


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I t l U O l


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Intra-Frequency Threshold for RSRP


This parameter specifies the absolute RSRP threshold for the serving cell to decide

whether to trigger an event (A1, A2, A3, A4, and A5).


Value Range: A1/A2/A4/A5 : Int (-140, , -44) Unit: dBm Value Range: A3: Float (-15, , 15) Step 0.5 Unit: dB

Default Value: [-75 -100 3 -90 -110]


This parameter is valid only when the RptCriteria parameter is set to 0(Event triggered

reporting). It is applicable to A1, A2, A3, A4, and A5 only. The A1 threshold is greater

than the A2 threshold.

Internal Use Only


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Intra-Frequency A5 Threshold2 for RSRP


This parameter specifies the second RSRP threshold for an adjacent cell to decide

whether to trigger the A5 event .


Value Range: Int (-140, , -44) Unit: dBm Default Value: -90


This parameter is mapped to the values that are defined in the 3GPP TS36.331: -

140 (0), -139 (1), , -44 (96). It should be noted that no value is mapped to 97.

Based on the A5 definition, this parameter must be greater than the Intra-

Frequency Threshold for RSRP parameter.

Internal Use Only


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Intra-Frequency Hysteresis


This parameter specifies the hysteresis that is used to decide whether to trigger an event.


Value Range: Float (0, , 15) Step 0.5 Unit: dB

Default Value:

RSRP event-triggered reporting: [0 0 0 0 0]

RSRP periodically triggered reporting: -

RSRQ event-triggered reporting: [0 0 0 0 0]

RSRQ periodically triggered reporting: -9

Internal Use Only


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Intra-Frequency Time to Trigger


This parameter specifies the time difference between event occurrence and event reporting.


Value Range: Enum (0, 40, 64, 80, 100, 128, 160, 256, 320, 480, 512, 640, 1024, 1280,

2560, 5120) Unit: ms

Default Value: [256 256 256 256 256]


The greater this parameter is configured, the more stringent the event trigger

requirements becomes. You need to configure this parameter based on the desirable

requirements. Setting this parameter to a too large value will have an adverse impact on

call quality.

The UE will trigger an event reporting only when the actual time reaches the threshold of

this parameter. This parameter is introduced to prevent the UE from any fraudulent

reporting caused by jitter. When configuring this parameter, you need to take the DRX

cycle into consideration.

Internal Use Only


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Intra-Frequency Reporting Interval for Event


This parameter specifies the time interval at which measurement results are periodically

reported after an event is triggered.


Value Range: Enum (120, 240, 480, 640, 1024, 2048, 5120, 10240, 60000, 360000,720000, 1800000, 3600000) Unit: ms

Default Value: [1024 1024 1024 1024 1024]


When an event is triggered, the UE reports measurement results at time intervals. If

the actual value reaches the threshold of this parameter, the UE will stop reportingany measurement result.

This parameter is valid only when the RptCriteriaparameter is set to 0(event

triggered reporting).

This parameter must be greater than the TrigTimeparameter.

Internal Use Only


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Intra-Frequency Amount of Reporting for event


This parameter specifies the maximum number of reporting measurement results after

an event is triggered.


Value Range: Enum (1, 2, 4, 8, 16, 32, 64, Infinity) Default Value: [Infinity Infinity Infinity Infinity Infinity]


When an event is triggered, the UE reports measurement results at time intervals. If

the actual number reaches the threshold of this parameter, the UE will stop

reporting any measurement result.

Do not set this parameter to a too large value because it is used for intra-frequency

handoff.

This parameter is valid only when the RptCriteriaparameter is set to 0(event

triggered reporting).

Internal Use Only


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Contents




Paging Parameters


Handoff Parameters


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y

Handoff Parameters

Threshold

A threshold is used to evaluate signal quality (A5: absolute threshold, A3: relative threshold).

Hysteresis and Timer

Hysteresis and timer are used to determine whether to start or stop an event.

Hysteresis is used to retard the start or stop of an event based on a decisive inequation,

which can greatly improve reliability for decision making. Hysteresis is normally used in

conjunction with a threshold.

A timer is used to evaluate time-based constancy of a certain state (including the start or

stop of an event) for the purpose of improving accuracy and reliability for event reporting.

For this reason, a timer is irrelevant to a threshold.

Customized Handoff Compensation

It can be used to compensate either a serving or adjacent cell.

When being added to the measured value of a serving cell, a positive compensation

value is used to prohibit a handoff.

When being added to the measured value of an adjacent cell, a positive compensation

value is used to trigger a handoff.

Internal Use Only


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y

Handoff Parameters

Time to Trigger


This parameter specifies the time difference between event occurrence and event reporting.


Value Range: Enum (0, 40, 64, 80, 100, 128, 160, 256, 320, 480, 512, 640, 1024, 1280,

2560, 5120) Unit: ms


This parameters is used to determine the time required for reporting an event, at which

the measured value meets the event reporting criteria.

The UE will trigger an event reporting only when the actual time reaches the threshold of

this parameter. This parameter is introduced to prevent the UE from any fraudulent

reporting caused by jitter. When configuring this parameter, you need to take the DRX

cycle into consideration.

You can set this parameter to a greater value for a low-speed cell. This can avoid any

Pingpong reporting of measurement results due to signal jitter.

Internal Use Only


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y

Handoff Parameters

Hysteresis


This parameter specifies the hysteresis for event reporting decision in order to avoid jitter.


Value Range: Enum (0, 0.5, , 15) Step: 0.5 Unit: dB


Setting this parameter to a too large value will increase difficulty in triggering an

event; however, setting this parameter to a too small value will result in the

Pingpong effect.

This parameter is comparable to the A3 Offset parameter. Meanwhile, it can be

used to avoid frequent measurement reporting.

Internal Use Only


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Handoff Parameters

Report On Leave


This parameter indicates an A3 event is leaving. It can be used to determine whether the

UE needs to report an event when the A3-2 criteria is satisfied.


Value Range: Enum (false, true) Default Value: false


When this parameter is set to true, the UE will report an event if a cell meets the

A3-2 criteria.

You do not need to set this parameter is set to trueif handoff is triggered by only

one measurement event reporting.

This parameter is valid for the ICIC feature, in which case you need to set this

parameter to trueso that the base station can monitor the UEs profile change.

Internal Use Only


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Documents

FDD LTE Radio Parameters Description Guide