radio resource administration v1.0

8/11/2019 Radio Resource Administration v1.0

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1 Nokia Siemens Networks

BSSPAR1: Chapter 2Radio Resource Administration


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Module Objectives

Give an overview about the TDMA frame structure

Describe the logical channels, their mapping to TDMA frames and theirparameters

Demonstrate, how the signalling capacity effect the mapping of the logicalchannels

Describe the purpose of the Base Station Identity Code and the TrainingSequence Code

Explain the use of frequency reuse and the fundamentals of frequencyhopping

Discuss the parameter settings required for base band and RF frequencyhopping


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TDMA frame= 8 timeslots

( 0.577ms * 8 = 4.615 ms)

01

34

5

76

01

23

4

5

76

01

23

45

200 kHz

Physical channele.g. allocated to onesubscriber with FR voiceand no frequency hopping

frequency

TDMA frame2

2 2 2

Basic TDMA Structure


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Base Station

Subsystem

Logical Channelsfor transport of specific content

Physical Channelstransport medium

MS

mapping

Physical channel parameters

ARFCN

Time slot number

Frequency hopping algorithm

GSM Channel Organization


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8/388 Nokia Siemens Networks

.

.

.

26 TDMA frames = 120 ms

1 26

t t tt t t t ft tt t t tt t t tt ft t t ttts i

Full Rate Traffic Channel Configuration (UL & DL)

Half Rate Traffic Channel Configuration (UL & DL)


1 26

t

T T

t t

T

t

f

t t

T T T T

t t

T

t

Tf

T

t

T

tt

T

s

S

t= full rate TCH, s= SACCH/T, i= idle TDMA frame

t= half rate TCH, s= SACCH/T (first user)

T= half rate TCH, S= SACCH/T (second user) TDMA frame

Traffic Channel Mapping



f s ff s f s

Downlink51 TDMA frames = 235 ms

-

Uplink

BCCH CCCH

f s f s

CCCH CCCH SDCCH 0

SDCCH 1

SDCCH 2

SDCCH 3

SACCH0/2 SACCH

1/3

r r f r r rr r r r fr r r r r rr r r r fr r r r rr f r r

1 51

SACCH2/0 SACCH

3/1

SDCCH 0

SDCCH 1SDCCH 3

SDCCH 2

f= FCCH, s= SCH, r= RACH TDMA frame

- = dummy burst


1 51

Signalling Channel Mapping(BCCH + SDCCH/4 + SACCH/C4)



f s ff s f s

Downlink51 TDMA frames = 235 ms

-

Uplink

BCCH CCCH

f s f s

CCCH CCCH

r r f r r rr r r r fr r r r r rr r r r fr r r r rr f r r

1 51

CCCH CCCHCCCH CCCH CCCH CCCH

r rr r rr r r r r r r rr r r r r rr rr r r

f= FCCH, s= SCH, r= RACH TDMA frame

- = dummy burst


1 51

Signalling Channel Mapping(BCCH +CCCH/9)



f

f

i = idle TDMA frame

f


iii

iii

SDCCH 0SDCCH 1

SDCCH 2

SDCCH 3

SDCCH 4

SDCCH 5

SDCCH 6

SDCCH 7

SDCCH 1

SDCCH 2

SDCCH 3

SDCCH 4

SDCCH 5

SDCCH 6

SDCCH 7SDCCH 0

Downlink

Uplink

SACCH0/4 SACCH

1/5

SACCH2/6 SACCH

3/7

SACCH6/2 SACCH

7/3

SACCH4/0SACCH

5/1


1 51

1 51

Signalling Channel Mapping(SDCCH/8 +SACCH/C4)


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Signalling Channel Mapping

New improved CCCH features in RG10

BSS20738 CS Paging Coordination in NMO II

BSS21538 Extended CCCH Extended CCCH can be allocated to timeslot 2,4,6

BSS101411 Extended BCCH For example Uncombined BCCH


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When static SDCCHs overbooked Free TCHs used for SDCCH traffic

Rules for dynamic SDCCH allocation:

SDCCH is configured to TRX with least number of SDCCHs or no SDCCHs yet at allSDCCH is configured to TRX with least number of occupied channelsIf between different types of TCHs must be selected, the preference order is: HR, FR, DR

TCHDFCA: SDCCH and Dynamic SDCCH not supported on DFCA TRXs (only on regular TRX)

Exceptions:

Configuration of any dynamic SDCCH resource in the BTS not possibleOnly one TCH of the BTS is available

Dynamic SDCCH allocation + FACCH call set up enabled simultaneouslydynamic SDCCH allocation has higher priority

Dynamic SDCCH Allocation


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S13 Feature (Licence Based)

Up to 24 SDCCH channels for a BCCH TRX,Up to 32 SDCCH channels for a non-BCCH TRXOnly supported by Ultrasite & Flexi BTS

Dynamic SDCCH must be activated in the BSC before Increased Dynamic SDCCHCapacity can be activated.

TRXSIG of 64kbps is required for the feature

Increased Dynamic SDCCH AllocationBSS21113


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SDCCH Allocation

2 TRX=16 channels

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

12:00:00AM

2:00:00AM

4:00:00AM

6:00:00AM

8:00:00AM

10:00:00AM

12:00:00PM

2:00:00PM

4:00:00PM

6:00:00PM

8:00:00PM

10:00:00PM

RTSL

SDCCH

BCCH

PEAK_PERMANENT_GPRS_CH

AVE_GPRS_CHANNELS

AVE_TCH_BUSY_FULL

0 1 2 3 4 5 6 7

TRX1 BCCH SDCCH SDCCH V/D V/D V/D V/D V/D

TRX2 SDCCH SDCCH V/D V/D V/D V/D D D

TIME

AVE_

SDCCH

(SDCCH/8)

AVE_

BUSY_

SDCCH

PEAK_

BUSY_

SDCC

H

AVE_

AVAIL_

FULL_TCH

AVE_

TCH_

BUSY_F

ULL

PEAK_

BUSY_

TCH

TCH_

PEAK_

BUSY_

FULL

TCH_

PEAK_

BUSY_

HALF

SDCCH_

CONG_

TIM

E(sec)

TCH_

FR_

RADIO_C

ONGESTION_

TIME(se

TCH_

HR_

RADIO_C

ONGESTION_

TIME(se

AVE_

GPRS_

CHANN

ELS

PEAK_

GPRS_

CHAN

NELS

PEAK_

PERMANENT_

GPRS_

CH

12:00:00 AM 32 5.0 18 6.3 4.0 9 9 0 0 8.48 0 4.7 8 2

1:00:00 AM 32 3.1 13 6.8 3.4 9 9 0 0 1.41 0 4.2 9 2

2:00:00 AM 32 1.7 12 5.2 2.9 7 7 0 0 0 0 5.8 9 2

3:00:00 AM 32 1.5 12 6.2 1.4 7 7 0 0 0 0 4.8 9 2

4:00:00 AM 32 1.6 10 8.0 1.7 5 5 0 0 0 0 3.0 9 2

5:00:00 AM 32 8.8 32 5.7 0.8 6 6 0 559 0 0 5.3 9 2

6:00:00 AM 32 5.2 18 4.3 1.1 6 6 0 0 0 0 6.7 9 2

7:00:00 AM 32 6.5 23 8.5 2.6 8 8 0 0 0 0 2.5 6 2

8:00:00 AM 32 4.8 20 6.6 2.2 7 7 0 0 0 0 4.4 9 2

9:00:00 AM 32 4.3 20 6.8 2.4 8 8 0 0 0 0 4.3 9 2

10:00:00 AM 32 5.2 32 7.5 2.6 9 9 0 2 0.21 0 3.5 9 2

11:00:00 AM 32 5.9 18 6.3 2.9 9 9 0 0 8.98 0 4.7 9 2

12:00:00 PM 32 5.9 19 6.8 3.9 9 9 0 0 13.52 0 4.2 8 2

1:00:00 PM 32 7.3 24 6.4 3.4 9 9 0 0 8.96 0 4.6 9 2

2:00:00 PM 32 6.8 30 6.2 3.9 9 9 0 0 44.05 0 4.8 8 2

3:00:00 PM 32 7.1 21 6.7 4.7 9 9 0 0 64.18 0 4.3 9 2

4:00:00 PM 32 7.7 23 6.6 3.9 9 9 0 0 25.61 0 4.4 8 2

5:00:00 PM 32 8.5 23 6.7 3.9 9 9 0 0 34.51 0 4.3 9 2

6:00:00 PM 32 10.7 27 8.3 5.9 9 9 0 0 320.58 0 2.7 7 2

7:00:00 PM 32 11.1 28 8.4 5.6 9 9 0 0 217.77 0 2.6 9 2

8:00:00 PM 32 10.4 30 7.8 5.5 9 9 0 0 284.15 0 3.2 8 2

9:00:00 PM 32 9.3 26 7.5 5.3 9 9 0 0 2 17.65 0 3.5 8 2

10:00:00 PM 32 8.3 22 7.5 5.2 9 9 0 0 185.36 0 3.5 9 211:00:00 PM 32 5.8 21 6.8 4.6 9 9 0 0 89.61 0 4.2 9 2

How SDCCH channels are planned?


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Alternative to dynamic SDCCH allocation (for call setup case)

Assignment of TCH to MS from CCCH instead of SDCCH Call set up on FACCH instead on SDCCH

Parameters (SEG Level)

newEstabCausesSupport (NECI) Y/N Enables feature is general

Parameters (BSC level)

ordinaryCallOnFacch (EOF) Y/N Enables ordinary call set up on FACCHemerCallOnFacch (EEF) Y/N Enables emergency call set up on FACCH

reestablishOnFacch (ERF) Y/N Enables call reestablishment on FACCHpagingAnsOnFacch (EPF) Y/N Enables answer to paging call setup on FACCH

FACCH Call Set Up


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Mobile terminating call -> MSC performs paging

MS identifies paging message with the IMSI/TMSIMS listens to own paging group only

SEG-BTS parameters

MSC parameters

Repaging Interval (INT) 0.5s10s Time between consecutive pagingattempts

Repaging Attempts (AT) 05 Number of paging repetitions

Buffering

BTS stores up to 8 paging messages of the MSC in page group bufferBTS sends paging messages to MS according noOfMultiframesBetweenPaging

Paging Channel (PCH) Parameters

MOClass

AbbreviatedName

RangeAnd Step

Description Defaultvalue

BSC - MMLName

BTS noOfMFramesB

etweenPaging

2...9, step

1

Defines the number of multiframes between

two transmissions of the same paging

message to the MSs of the same paging

group.

4 MFR

Paging Channel (PCH) is a downlink channel, which is broadcast by all the BTSs of a Location Area inthe case of a mobile terminated call and SMS

The PCH is used to carry Paging Request messages for mobiles that the network wants to contact


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Mobile sends channel requests to BTS separated by random time intervals in case of no answer!

Parameters

Random time interval between consecutive retransmissions

t = S + random [0,..numberOfSlotsSpreadTrans1] RACH slots

S depends on numberOfSlotsSpreadTranssignalling channel mapping (CCCH + SDCCH combined or not in one multi frame)

numberOfSlotsSpreadTrans = 10

signalling channel mapping= not combinedS= 58

Therefore t = 58..to..67 RACH slotstime channel requests

RACH Parameters

MO

Class

Abbreviated

Name

Range And Step Description Default

value

BSC - MML

Name

BTS maxNumberRetra

nsmission

1,2,4,7 Maximum number of retransmissions on the RACH

that the MS can perform.

4 RET

BTS nbrOfSlotsSpreadTrans

MML Range:3..12, 14, 16, 20,

25, 32, 50

The number of TDMA frames over whichretransmission is spread on the RACH (random

access channel)

10 SLO

Random Access Channel (RACH) is the only uplink logical channel and the first point-to-pointchannel in the common control channels. It is used by the mobile station to initiate a transaction, oras a response to a PCH.

UL interference => lots ofretransmissions


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Network gives the MS dedicated resources

Downlink CCCH blocks

PCH can be used for AGCH messages

AGCH cannot be used for PCH messages

Reservation of CCCH blocks for AGCH

noOfBlocksForAccessGrant (AG) 0..7 possible number, if CCCH and SDCCH are not combined1..7 possible number, if CBCH is used in non combinedconfiguration0..2 possible number, if CCCH and SDCCH are combined

Preference of AGCH messages on PCH

noOfBlocksForAccessGrant 0 PCH can be used only, if no paging messages have to besend

= 0 AGCH messages have higher priority than PCH ones

Number of paging groups

N = (number of CCCH blocks noOfBlocksForAccessGrant) * noOfMultiframesBetweenPaging

AGCH Parameters

Is used to assign to a mobile a Stand-alone Dedicated Control Channel(SDCCH) (DL)

is used to assign radio resources to mobiles

used to send an Immediate Assignment Reject to up to four mobiles in answer to requests for radio

resources if none are available. Each Immediate Assignment or Reject message is carried within oneCCCH block

For example, if we have a non-combined configuration andAG=3, this means that of the nine CCCH blocks, three are

reserved for AGCH while the remaining six can be used foreither PCH or AGCH


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Example - Signaling capacity

13 SDCCH channels needed

=>BCCH + SDCCH/8 (not combined)

=>BCCH + 2 SDCCH

Chs 1% 2% 3% 5%

1 0.01 0.02 0.03 0.05

2 0.15 0.22 0.28 0.38

3 0.46 0.60 0.72 0.904 0.87 1.09 1.26 1.52

5 1.36 1.66 1.88 2.22

6 1.91 2.28 2.54 2.96

7 2.50 2.94 3.25 3.75

8 3.13 3.63 3.99 4.54

9 3.78 4.34 4.75 5.37

10 4.46 5.08 5.53 6.22

11 5.16 5.84 6.33 7.08

12 5.88 6.61 7.14 7.95

136.61 7.40 7.97 8.83

14 7.35 8.20 8.80 9.73

15 8.11 9.01 9.65 10.60

16 8.88 9.83 10.50 11.50

17 9.65 10.70 11.40 12.50

18 10.40 11.50 12.20 13.40

19 11.20 12.30 13.10 14.30

20 12.00 13.20 14.00 15.20

Traffic profileCall establishment

number of cells 100number of subscriber 50000

authentication and ciphering (sec) 7

subs/cell 500

authentication and ciphering sec => Erl 0.001944

SDCCH traffic (Erl/cell) 0.972222

SMS

SMS/ subs/hour 5MHT for SMS (sec) 6

SMS traffic (sec => Erl) 0.001667


Location update

LU / Call 1

authentication and ciphering (sec) 7

authentication and ciphering sec => Erl 0.001944


Total SDCCH 6.111111

Check from Erlang B Tabl,


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Chs 1 % 2 % 3 % 5 % Chs 1 % 2 % 3 % 5 %

1 0 .0 1 0 .0 2 0 .0 3 0 . 0 5

2 1 1 2 . 8 0 1 4 .0 0 1 4 . 9 0 1 6 .2 0

2 0 .1 5 0 .2 2 0 .2 8 0 . 3 8 2 2 1 3 . 7 0 1 4 .9 0 1 5 . 8 0 1 7 .1 0

3 0 .4 6 0 .6 0 0 .7 2 0 . 9 0 2 3 1 4 . 5 0 1 5 .8 0 1 6 . 7 0 1 8 .1 0

4 0 .8 7 1 .0 9 1 .2 6 1 . 5 2 2 4 1 5 . 3 0 1 6 .6 0 1 7 . 6 0 1 9 .0 0

5 1 .3 6 1 .6 6 1 .8 8 2 . 2 2 2 5 1 6 . 1 0 1 7 .5 0 1 8 . 5 0 2 0 .0 0

6 1 .9 1 2 .2 8 2 .5 4 2 . 9 6 2 6 1 7 . 0 0 1 8 .4 0 1 9 . 4 0 2 0 .9 0

7 2 .5 0 2 .9 4 3 .2 5 3 . 7 5 2 7 1 7 . 8 0 1 9 .3 0 2 0 . 3 0 2 1 .9 0

8 3 .1 3 3 .6 3 3 .9 9 4 . 5 4 2 8 1 8 . 6 0 2 0 .2 0 2 1 . 2 0 2 2 .9 0

9 3 .7 8 4 .3 4 4 .7 5 5 . 3 7 2 9 1 9 . 5 0 2 1 .0 0 2 2 . 1 0 2 3 .8 0

1 0 4 .4 6 5 .0 8 5 .5 3 6 . 2 2 3 0 2 0 . 3 0 2 1 .9 0 2 3 . 1 0 2 4 .8 0

1 1 5 .1 6 5 .8 4 6 .3 3 7 . 0 8 3 1 2 1 . 2 0 2 2 .8 0 2 4 . 0 0 2 5 .8 0

1 2 5 .8 8 6 .6 1 7 .1 4 7 . 9 5 3 2 2 2 . 0 0 2 3 .7 0 2 4 . 9 0 2 6 .7 0

1 3 6 .6 1 7 .4 0 7 .9 7 8 . 8 3 3 3 2 2 . 9 0 2 4 .6 0 2 5 . 8 0 2 7 .7 0

1 4 7 .3 5 8 .2 0 8 .8 0 9 . 7 3 3 4 2 3 . 8 0 2 5 .5 0 2 6 . 8 0 2 8 .7 0

1 5 8 .1 1 9 .0 1 9 .6 5 1 0 .6 0 3 5 2 4 . 6 0 2 6 .4 0 2 7 . 7 0 2 9 .7 0

1 6 8 .8 8 9 .8 3 1 0 .5 0 1 1 .5 0 3 6 2 5 . 5 0 2 7 .3 0 2 8 . 6 0 3 0 .7 0

1 7 9 .6 5 1 0 .7 0 1 1 .4 0 1 2 .5 0 3 7 2 6 . 4 0 2 8 .3 0 2 9 . 6 0 3 1 .6 0

1 8 1 0 .4 0 1 1 .5 0 1 2 .2 0 1 3 .4 0 3 8 2 7 . 3 0 2 9 .2 0 3 0 . 5 0 3 2 .6 0

1 9 1 1 .2 0 1 2 .3 0 1 3 .1 0 1 4 .3 0 3 9 2 8 . 1 0 3 0 .1 0 3 1 . 5 0 3 3 .6 0

2 0 1 2 .0 0 1 3 .2 0 1 4 .0 0 1 5 .2 0 4 0 2 9 . 0 0 3 1 .0 0 3 2 . 4 0 3 4 .6 0

Erlang B TableFor reference in upcoming calculations


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Combined CCCH / SDCCH configuration

noOfBlocksForAccessGrant = 1 2 CCCH blocks for PCH

3 MSs paged per paging message 3 pages per block

2 blocks per multi frame 3 * 2 = 6 pages per multiframe

Number of pages per hour 3600 s / 0.235 s * 6 = 91915

Avg of 2 pages required per MS 91915 / 2 = 45957 MSs perhour

BTS 3 MS

Paging_Request

BTS 3 MS

Paging_Request

Paging CapacityExample


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Cell with 325 subscribers

1 call per subscriber once in a hour

1 location update (LU) per subscriber once in 2 hours

Duration of call assignment = 4 s 4 s / 3600 s = 1.11 mErl on SDCCH persubscriber

325 subscribers 325 * 1.11 mErl = 0.3607 Erl on SDCCH

Reservation time for LU = 5s 5 s / 7200 s = 0.69 mErl on SDCCH persubscriber

325 subscribers 0.2242 Erl on SDCCH

Total SDCCH traffic 0.3607 Erl + 0.2242 Erl = 0.5849 ErlBlocking probability = 1% 4 SDCCHs required SDCCH combined with

CCCH can be used (MBCCHC)

SDCCH Signalling CapacityExample with call Establishment & Location Update


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Same cell with 325 subscribers

Additional SMS traffic of 1 mErl per subscriber

325 subscribers 325 * 1 mErl = 0.325 Erl on SDCCH

Total SDCCH traffic 0.5849 + 0.325 Erl = 0.9099 ErlBlocking probability = 1% 5 SDCCHs required not combined with

CCCH (MBCCH)

SDCCH Signalling CapacityExample including SMS


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Base Station Identity Code BSIC = Network Colour Code NCC + Base Station Colour Code BCC

bsIdentityCode Setting of BSIC

NCC 0..7, distinguishes between PLMNsBCC 0..7, distinguishes between clusters

BSIC + frequency channel unique identity of adjacent cell

f1 f2f3

f1

f1

bcc = 1

bcc = 2

bcc = 3

Base Station Identity Code


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Training Sequence Code (TSC) 07

Defined on TRX levelUsed to determine signal distortion and bit error rateNote!In OSC TSC parameter is used to separate users

training

sequenceencrypted bitsencrypted bits3 31

stealing flag stealing flag

57 bits 57 bits26 bits

1

tail bits tail bits

Burst on TCH

data difference =difference

expected burst

training sequence ??

received burst

correlation

data* data*training sequence*

data*

Training Sequence Code


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200 kHz

890 915 935 960

1 2 3 4 124123 1 2 3 4 124123

duplex distance

Absolute radio frequency carrier number ARFCN

uplink direction downlink direction

Example: GSM 900

Defining Frequency carrier number


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Frequency to be used by TRX (must be unique within a BTS)

initialFrequency (FREQ) 11023 Setting of ARFCNs

GSM 800: 128 .. 251GSM 900: 1..124 and 975..1023, 0GSM 1800: 512..885GSM 1900: 512..810

f1

f2

f3

f4

f5

f6

f7

f1 f2

f3

f4

f5

f6

f7

f1

f2

f3

f4

f5

f6

f7

Frequency Reuse


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Defining BA list

bCCHAllocationList ID 12000 Indicates ARFCN values given by BCCHallocation listfrequencyBandinUse 800, 900, 1800, 1900, Multi

Frequency list of ARFCN in the BAL

Idle mode MS listens on BCCH

idleStateBCCHAllocation (IDLE) 0,12000 0 = MS gets frequency information fromadjacent cells defined for the BTS1..2000 = MS gets frequency information fromthe defined BCCH allocation list

Dedicated mode MS listens on SACCH

measurementBCCHAllocation (ACT) ADJ = MS gets frequency information fromadjacent cells defined for the BTSIDLE = active MS uses same BCCH freq list as

idle MS

Frequency Information for MS


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Frequency

Time

F1

F2

F3

Call is transmitted through several frequencies to

average the interference (interference diversity)

minimise the impact of fading (frequency diversity)

Frequency hopping techniques

hoppingMode (HOP) BB,RF,NBB = base band hopping (1)RF = RF hopping (2)N = no frequency hopping at all (0)

Principle of Frequency Hopping


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Baseband Hopping

TRX 1

TRX 2

TRX 3

0 1 72 Timeslot

TRX 4

BC

CHf 1

f 2

f 3

f 4

HSN1(BB hopping group 1 and RF hopping)

Timeslot 0 hops over TRXs 2-4 onlyBCCH does not hop

HSN2(BB hopping group 2)

Timeslots 1-7 hop over all TRXs

TRXs do not hopPhysical channels moved from one TRX to another

Hopping sequencehoppingSequenceNumber (HSN) 0..63

0 = cyclic hopping1..63 = pseudorandom hopping

Base Band Hopping


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RF HoppingStandard technique

TRX 1

TRX 2

TRX 3

0 1 72 Timeslot

TRX 4

BC

CH f1 no hopping

f2,f3..fn

hopping accordingmobile allocation list

One hopping sequence

number only

All TRXs hop except TRX1 (provides BCCH)Up to 63 frequencies available defined by mobile allocation list -> better hopping gain

mobileAllocationList Setting of ARFCN valuesusedMobileAllocation (MAL) 0,1...2000 0 = BTS detached from any list

1..2000 = indicates list which shall be used


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Standard technique

9 hopping hopping frequencies MAI = 0..8But 3 frequencies available for every TRX only

Freeform hopping

For every sector samemobile allocation list

hopping sequence numberframe number (frame synchronization)

For every sector differentstarting points for hopping sequencepossible by mobile allocation index offset

maioOffset (MO) 0..62

setting of MAIO

9 hopping hopping frequencies MAI = 0..89 frequencies available for every TRX

RF HoppingFreeform Hopping

MAIO

Offset MAI

TRX-1 (BCCH) -

TRX-2 0

TRX-3 1

TRX-4 2

TRX-5 (BCCH) -

TRX-6 3

TRX-7 4

TRX-8 5

TRX-9 (BCCH) -

TRX-10 6

TRX-11 7

TRX-12 8

Sector-3 6

Sector-1 0

Sector-2 3

RF H i


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Freeform hopping

Not adequate for MA list with consecutive ARFCNvaluesAvoids co-channel interference but not adjacentchannel interference

Flexible MAIO management

MAIO increases with constant step size from one TRXto the next one

maioStep (MS) 1..62

maioOffset = 0, 6, 12 for sector 1, 2, 3maioStep = 218 frequencies required (2 * number of hopping TRXs)

RF HoppingFlexible MAIO Management

MAIO

Offset

MAIO

Step MAI

TRX-1 (BCCH) -

TRX-2 0

TRX-3 2

TRX-4 4

TRX-5 (BCCH) -

TRX-6 6

TRX-7 8

TRX-8 10

TRX-9 (BCCH) -

TRX-10 12

TRX-11 14

TRX-12 16

Sector-3 2

0

6

12

Sector-1 2

Sector-2 2

Si l MA Li Pl i C


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Site C

The sectors

share the same

HSN

MAIO Offsetdetermines

the MAIO of thefirst

hopping TRX in each

sector

MAIOs for the rest of the hopping

TRXs are determined by adding

MAIO Stepto the MAIO of the

previous hopping TRX

MAI value for each TDMA frame is calculated byBTS and MS by using HSN and TDMA frame

number

No co- or adjacent channel

interference between

sectors

Transmitted frequencies for each

TRX during each TDMA frame

Single MA List Planning Case(1/1 Frequency allocation reuse) MAIO Example

RF H i (Ti ht F R )


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BCCH

Band allocation:

MA listConsecutive ARFCN

Only BCCH frequency planning required

Flexible MAIO managementMAIO Offset + MAIO Step

BCCH

Band allocation:

MA listNon-adjacent ARFCN

Freeform hoppingMAIO Offset

MA list and BCCH frequency planning required

RF Hopping (Tight Frequency Reuse)


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