BSSPAR 1 Radio Resource Admin

BSSPAR: Chapter 1Radio Resource Administration

1 © Nokia Siemens Networks Packet Abis

TDMA frameTDMA frame33

4455

7766

0011

2233

4455

Physical channel Physical channel e.g. allocated to onee.g. allocated to one

subscriber with FR voicesubscriber with FR voiceand and no frequency hoppingno frequency hopping

Basic TDMA Structure


= 8 timeslots= 8 timeslots

(( 0.577ms * 8 = 4.615 ms)0.577ms * 8 = 4.615 ms)

0011

3344

55

7766

0011

2233

200 kHz200 kHzfrequencyfrequency

TDMA frameTDMA frame22

22 22 22

00 20472047

00 11 22 4848 4949 5050

2048 super frames = 2048 super frames = hyper framehyper frame

Super frameSuper frame = 26 x (51 multi frame)= 26 x (51 multi frame)

TDMA frame TDMA frame numberingnumbering

Multi, Super & Hyper Frames


00 11 22 4949 505000 11 22 2424 2525

00 11 22 4848 4949 505000 11 2424 2525

00 77

Super frameSuper frame = 26 x (51 multi frame)= 26 x (51 multi frame)or 51 x (26 multi frame)or 51 x (26 multi frame)

26 multi frame26 multi frame = 120 ms= 120 ms 51 multi frame 51 multi frame = 235 ms= 235 ms

TDMA frame TDMA frame = 4.615 ms= 4.615 ms

00 11 22 4949 5050

(Traffic and associated signalling)(Traffic and associated signalling) (Signalling and Control channels)(Signalling and Control channels)

Logical ChannelsLogical Channelsfor transport of specific contentfor transport of specific content

GSM Channel Organization


Base StationBase StationSubsystemSubsystem

Physical ChannelsPhysical Channelstransport mediumtransport medium

MSMS

mappingmapping

Physical channel parametersPhysical channel parametersARFCNARFCN

Time slot numberTime slot numberFrequency hopping algorithmFrequency hopping algorithm

SCHSCH

FCCHFCCH

PCHPCH

BCCHBCCH

AGCHAGCH

RACHRACH

Frequency Correction ChannelFrequency Correction Channel

Synchronisation ChannelSynchronisation Channel

Broadcast Control ChannelBroadcast Control Channel

Paging ChannelPaging ChannelPaging ChannelPaging Channel

Random Access ChannelRandom Access Channel

Access Grant ChannelAccess Grant Channel

BCHBCH

CCCHCCCH

DLDL

DLDL

DLDL

ULUL

CommonCommonChannelsChannels

CBCHCBCH Cell Broadcast ChannelCell Broadcast Channel

Logical Channels


AGCHAGCH

SDCCHSDCCH

SACCHSACCH

FACCHFACCH

Stand alone Dedicated Control ChannelStand alone Dedicated Control Channel

Slow Associated Control ChannelSlow Associated Control Channel

Fast Associated Control ChannelFast Associated Control Channel

Access Grant ChannelAccess Grant Channel

DCCHDCCH

TCHTCH

DedicatedDedicatedChannelsChannels

UL/DLUL/DL

UL/DLUL/DL

FR/HRFR/HR Full rate / Halft rate TCHFull rate / Halft rate TCH

EFREFR Enhanced Full rate TCHEnhanced Full rate TCH

AMR FR/HRAMR FR/HR Adaptive multirate TCH (FR/HR)Adaptive multirate TCH (FR/HR)

26 TDMA frames = 120 ms26 TDMA frames = 120 ms

11 2626

tt tt tttt tt tt tt fftt tttt tt tt tttt tt tt tttt fftt tt tt ttttttss ii

Full Rate Traffic Channel Configuration (UL & DL)Full Rate Traffic Channel Configuration (UL & DL)

Traffic Channel Mapping


......

11 2626

Half Rate Traffic Channel Configuration (UL & DL)Half Rate Traffic Channel Configuration (UL & DL)


11 2626

tt

TT TT

tt tt

TT

ttff

tt tt

TT TT TT TT

tt tt

TT

tt

TTff

TT

tt

TT

tttt

TT

ss

SS

tt = full rate TCH, = full rate TCH, ss = SACCH= SACCH/T/T, , ii = idle TDMA frame= idle TDMA frame

tt = half rate TCH, = half rate TCH, ss = SACCH= SACCH/T/T (first user)(first user)TT = half rate TCH, = half rate TCH, SS = SACCH= SACCH/T/T (second user) TDMA frame(second user) TDMA frame

Signaling Channel Mapping Combined Configuration: (BCCH + SDCCH/4+ CCCH/3)

Time Slot 0Time Slot 0DownlinkDownlink 51 TDMA frames = 235 ms51 TDMA frames = 235 ms

ff ss bbbb bbbbcc ffcc ffcc sscccc cccc cccc cccc ffcc ffss tt tt tt tt tttt tt tt ff fftt tt tt tt tttt tt tt ffss ffssss ssss ssss sss s ss


tt tt tttt rr rr ss ffss ssss ssssss rr rr rrrr rr rr rrss ffrr rr rr rr rr rrrr rr rr rr ffrr rr rr rr ttrr tt tt ttrr fftt tt tt rr ttrr tt tttt

UplinkUplink

tt

00 5050

1.1. 2.2. 3.3. 4.4.

CHANNELS f = FCCH b = BCCH r = RACH CHANNELS f = FCCH b = BCCH r = RACH

s = SCH/SACCH c = CCCH t = SDCCH/4s = SCH/SACCH c = CCCH t = SDCCH/4

Signaling Channel Mapping Separated Channel Configuration: (BCCH +CCCH/9)

Time Slot 0Time Slot 0

ff ss bbbb bbbb cc ffcc ffcc ss cc cc cc cc cccc cc cc ffcc ffss cc cc cc cc cccc cc cc ff ffcc cc cc cc cccc cc cc ffss ffcc cc cc cc cccc cc ccss

DownlinkDownlink 51 TDMA frames = 235ms51 TDMA frames = 235ms


CHANNELS f = FCCH b = BCCH r = RACH CHANNELS f = FCCH b = BCCH r = RACH

s = SCH/SACCH c = CCCH t = SDCCH/4s = SCH/SACCH c = CCCH t = SDCCH/4

rr rr rrrr rr rr rr ffrr rrrr rr rr rr rr rr rrrr rr rr rrrr ffrr rr rr rr rr rrrr rr rr rr ffrr rr rr rr rrrr rr rr rrrr ffrr rr rr rr rrrr rr rrrr

UplinkUplink

rr

tt tt tttt tt tt tt fftt tttt tt tt tt tt tt tttt tt tt tttt fftt tt tt tt tt tttt tt tt tt ffssss ssss ssss ss ssss ffssss ssssssss

DownlinkDownlink

tt


ss

Other than Time Other than Time Slot Slot 00

Signaling Channel Mapping Separated/Hybrid Channel Configuration: (SDCCH/8 +SACCH/4)


CHANNELS t = SDCCH/8 s = SACCH/8CHANNELS t = SDCCH/8 s = SACCH/8

ssss ssss ssssss ffss ssss ss tt tttt tt tt ttss fftt tt tt tt tt tttt tt tt tt fftt tt tt tt tttt tt tt tttt fftt tt tt tt tttt tt tttt

UplinkUplink

tt

1.1. 2.2. 3.3. 5.5. 6.6. 7.7. 8.8.4.4.

Signaling Channel MappingComparison of number of CCCH Blocks : Separated and Combined Configuration

Separated BCCH/CCCH and SDCCHSeparated BCCH/CCCH and SDCCH51 TDMA frames = 235 ms51 TDMA frames = 235 ms

11 22 33 44 55 66 77 88 99

ff ss bbbb bbbb cc ffcc ffcc ss cc cc cc cc cccc cc cc ffcc ffss cc cc cc cc cccc cc cc ff ffcc cc cc cc cccc cc cc ffss ffcc cc cc cc cccc cc ccss


f = FCCHf = FCCH b b = BCCH= BCCH t = SDCCHt = SDCCHii=idle=idle

s = SCH/SACCHs = SCH/SACCH c = CCCH = PCH/AGCHc = CCCH = PCH/AGCH

11 22 33Combined BCCH/CCCH/SDCCHCombined BCCH/CCCH/SDCCH

ff ss bbbb bbbbcc ffcc ffcc sscccc cccc cccc cccc ffcc ffss tt tt tt tt tttt tt tt ff fftt tt tt tt tttt tt tt ffss ffssss ssss ssss ss ssss

Channel configuration defined by parameter channel TypeChannel configuration defined by parameter channel Type

TCHF (0)TCHF (0) = full rate traffic channel= full rate traffic channelTCHH (1)TCHH (1) = half rate traffic channel (Note OSC = half rate traffic channel (Note OSC ––double HR)double HR)TCHD (2)TCHD (2) = dual rate traffic channel= dual rate traffic channelSDCCH (3)SDCCH (3) = standalone (SDCCH/8)= standalone (SDCCH/8)MBCCHMBCCH (4)(4) = broadcast control channel= broadcast control channel

Channel MappingParameter Setting

MO Class TR/RTSLMO Class TR/RTSLParameter Parameter channelxTypechannelxType ((CHxCHx) where x = 0…7) where x = 0…7


MBCCHMBCCH (4)(4) = broadcast control channel= broadcast control channelMBCCHC (5)MBCCHC (5) = = BCCH + SDCCH/4BCCH + SDCCH/4MBCCBMBCCB (7)(7) = = BCCH + SDCCH/3 with CBCHBCCH + SDCCH/3 with CBCHSDCCBSDCCB (8)(8) = SDCCH/7 with CBCH= SDCCH/7 with CBCHNOTUSED (9)NOTUSED (9) = timeslot has no radio definition or = timeslot has no radio definition or AbisAbis allocationallocationERACHERACH (10)(10) = random access channel of extended area= random access channel of extended areaEGTCH (14)EGTCH (14) = EGPRS packed data traffic channel for extended area= EGPRS packed data traffic channel for extended areaLRTCH (15) LRTCH (15) = long reach traffic channel= long reach traffic channel

Note: Note: •• Some values not allowed in certain Some values not allowed in certain tsltsl (e.g. TSL0 can’t (e.g. TSL0 can’t

have value 8)have value 8)•• PBCCH is not supported in S13 and onwardsPBCCH is not supported in S13 and onwards

When static SDCCHs overbooked When static SDCCHs overbooked �� Free TCHs used for SDCCH trafficFree TCHs used for SDCCH traffic

Rules for dynamic SDCCH allocation: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 SDCCHs or no SDCCHs yet at all•• SDCCH is configured to TRX with least number of occupied channelsSDCCH is configured to TRX with least number of occupied channels

•• If between different types of TCHs must be selected, the preference order is: HR, FR, DR If between different types of TCHs must be selected, the preference order is: HR, FR, DR TCHTCH

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

Dynamic SDCCH Allocation


Exceptions:Exceptions:

•• Configuration of any dynamic SDCCH resource in the BTS not possibleConfiguration of any dynamic SDCCH resource in the BTS not possible•• Only one TCH of the BTS is availableOnly one TCH of the BTS is available

Dynamic SDCCH allocation + FACCH call set up enable d simultaneouslyDynamic SDCCH allocation + FACCH call set up enable d simultaneously�� dynamic SDCCH allocation has higher prioritydynamic SDCCH allocation has higher priority

Alternative to dynamic SDCCH allocation (for call s etup case)Alternative to dynamic SDCCH allocation (for call s etup case)

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

Parameters (SEG Level)Parameters (SEG Level)

newEstabCausesSupport (NECI)newEstabCausesSupport (NECI) Y/NY/N Enables feature is generalEnables feature is general

FACCH Call Set Up


Parameters (BSC level)Parameters (BSC level)

ordinaryCallOnFacch (EOF)ordinaryCallOnFacch (EOF) Y/NY/N Enables ordinary call set up on FACCHEnables ordinary call set up on FACCHemerCallOnFacch (EEF)emerCallOnFacch (EEF) Y/NY/N Enables emergency call set up on FACCHEnables emergency call set up on FACCHreestablishOnFacch (ERF)reestablishOnFacch (ERF) Y/NY/N Enables call reestablishment on FACCHEnables call reestablishment on FACCH

pagingAnsOnFacch (EPF)pagingAnsOnFacch (EPF) Y/NY/N Enables answer to paging call setup on FACCHEnables answer to paging call setup on FACCH

Example - Signaling capacity

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 0.90

4 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

13 6.61 7.40 7.97 8.83

14 7.35 8.20 8.80 9.73

15 8.11 9.01 9.65 10.60

Traffic profileTraffic profileCall establishmentCall establishmentnumber of cellsnumber of cells 100100number of subscribernumber of subscriber 5000050000authentication and ciphering (sec)authentication and ciphering (sec) 77

subs/cell subs/cell 500500authentication and ciphering sec => Erlauthentication and ciphering sec => Erl 0.0019440.001944SDCCH traffic (Erl/cell)SDCCH traffic (Erl/cell) 0.9722220.972222

SMSSMSSMS/ subs/hourSMS/ subs/hour 55MHT for SMS (sec)MHT for SMS (sec) 66


13 SDCCH channels needed13 SDCCH channels needed

=>BCCH + SDCCH/8 (not combined)=>BCCH + SDCCH/8 (not combined)

=>BCCH + 2 SDCCH=>BCCH + 2 SDCCH

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

MHT for SMS (sec)MHT for SMS (sec) 66SMS traffic (sec => Erl)SMS traffic (sec => Erl) 0.0016670.001667SDCCH traffic (Erl/cell)SDCCH traffic (Erl/cell) 4.1666674.166667

Location updateLocation updateLU / CallLU / Call 11authentication and ciphering (sec)authentication and ciphering (sec) 77authentication and ciphering sec => Erlauthentication and ciphering sec => Erl 0.0019440.001944SDCCH traffic (Erl/cell)SDCCH traffic (Erl/cell) 0.9722220.972222

Total SDCCHTotal SDCCH 6.1111116.111111Check from Erlang B Tabl, Check from Erlang B Tabl,

Chs 1% 2% 3% 5% Chs 1% 2% 3% 5%1 0.01 0.02 0.03 0.05 21 12.80 14.00 14.90 16.20

2 0.15 0.22 0.28 0.38 22 13.70 14.90 15.80 17.10

3 0.46 0.60 0.72 0.90 23 14.50 15.80 16.70 18.10

4 0.87 1.09 1.26 1.52 24 15.30 16.60 17.60 19.00

5 1.36 1.66 1.88 2.22 25 16.10 17.50 18.50 20.00

6 1.91 2.28 2.54 2.96 26 17.00 18.40 19.40 20.90

7 2.50 2.94 3.25 3.75 27 17.80 19.30 20.30 21.90

8 3.13 3.63 3.99 4.54 28 18.60 20.20 21.20 22.90

9 3.78 4.34 4.75 5.37 29 19.50 21.00 22.10 23.80

Erlang B TableFor reference in upcoming calculations


9 3.78 4.34 4.75 5.37 29 19.50 21.00 22.10 23.80

10 4.46 5.08 5.53 6.22 30 20.30 21.90 23.10 24.80

11 5.16 5.84 6.33 7.08 31 21.20 22.80 24.00 25.80

12 5.88 6.61 7.14 7.95 32 22.00 23.70 24.90 26.70

13 6.61 7.40 7.97 8.83 33 22.90 24.60 25.80 27.70

14 7.35 8.20 8.80 9.73 34 23.80 25.50 26.80 28.70

15 8.11 9.01 9.65 10.60 35 24.60 26.40 27.70 29.70

16 8.88 9.83 10.50 11.50 36 25.50 27.30 28.60 30.70

17 9.65 10.70 11.40 12.50 37 26.40 28.30 29.60 31.60

18 10.40 11.50 12.20 13.40 38 27.30 29.20 30.50 32.60

19 11.20 12.30 13.10 14.30 39 28.10 30.10 31.50 33.60

20 12.00 13.20 14.00 15.20 40 29.00 31.00 32.40 34.60

Combined CCCH / SDCCH configuration

noOfBlocksForAccessGrant = 1 �� 2 CCCH blocks for PCH

3 MSs paged per paging message �� 3 pages per block2 blocks per multi frame �� 3 * 2 = 6 pages per multiframe

BTSBTS 3 MS 3 MS

Paging_RequestPaging_Request

BTSBTS 3 MS3 MS

Paging CapacityExample


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

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

BTSBTS 3 MS3 MS

Paging_RequestPaging_Request

Cell with 325 subscribers1 call per subscriber once in a hour1 location update (LU) per subscriber once in 2 hou rs

Duration of call assignment = 4 s �� 4 s / 3600 s = 1.11 mErl on SDCCH per subscriber325 subscribers �� 325 * 1.11 mErl = 0.3607 Erl on SDCCH

SDCCH Signalling CapacityExample with call Establishment & Location Update


Reservation time for LU = 5s �� 5 s / 7200 s = 0.69 mErl on SDCCH per subscriber325 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)

Same cell with 325 subscribersAdditional 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 Erl

SDCCH Signalling CapacityExample including SMS


Blocking probability = 1% �� 5 SDCCHs required �� not combined with CCCH (MBCCH)

Base Station Identity Code BSIC = Network Colour Co de NCC + Base Station Colour Code BCCBase Station Identity Code BSIC = Network Colour Co de NCC + Base Station Colour Code BCC

bsIdentityCodebsIdentityCode Setting of BSIC Setting of BSIC

NCCNCC 0..7, distinguishes between PLMNs0..7, distinguishes between PLMNsBCCBCC 0..7, distinguishes between clusters0..7, distinguishes between clusters

BSIC + frequency channel BSIC + frequency channel �� unique identity of adjacent cellunique identity of adjacent cell

Base Station Identity CodeBase Station Identity Code


f1f1f2f2

f3f3

f1f1

f1f1

bcc = 1bcc = 1

bcc = 2bcc = 2

bcc = 3bcc = 3

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

initialFrequencyinitialFrequency (FREQ)(FREQ) 1…10231…1023 Setting of ARFCNsSetting of ARFCNs

GSM 800: GSM 800: 128 .. 251 128 .. 251 GSM 900: GSM 900: 1..124 and 975..1023, 0 1..124 and 975..1023, 0 GSM 1800: GSM 1800: 512..885 512..885 GSM 1900: GSM 1900: 512..810512..810

f2f2

Frequency ReuseFrequency Reuse


f1f1f2f2

f3f3f4f4

f5f5f6f6

f7f7

f1f1f2f2

f3f3f4f4

f5f5f6f6

f7f7

f1f1f2f2

f3f3f4f4

f5f5f6f6

f7f7

Idle mode Idle mode �� MS listens on BCCHMS listens on BCCH

idleStateBCCHAllocationidleStateBCCHAllocation (IDLE)(IDLE) 0,1…20000,1…2000 0 = MS gets frequency information from0 = MS gets frequency information fromadjacent cells defined for the BTSadjacent cells defined for the BTS1..2000 = MS gets frequency information from1..2000 = MS gets frequency information fromthe defined BCCH allocation listthe defined BCCH allocation list

Dedicated mode Dedicated mode �� MS listens on SACCHMS listens on SACCH

Frequency Information for MSFrequency Information for MS


Defining BA listDefining BA list

bCCHAllocationListbCCHAllocationList IDID 1…20001…2000 Indicates ARFCN values given by BCCHIndicates ARFCN values given by BCCHallocation listallocation list

frequencyBandinUsefrequencyBandinUse 800, 900, 1800, 1900, Multi800, 900, 1800, 1900, Multi

FrequencyFrequency list of ARFCN in the BALlist of ARFCN in the BAL

measurementBCCHAllocationmeasurementBCCHAllocation (ACT)(ACT) ADJ = ADJ = MS gets frequency information fromMS gets frequency information fromadjacent cells defined for the BTSadjacent cells defined for the BTSIDLE = active MS uses same BCCH freq list IDLE = active MS uses same BCCH freq list as as idle MSidle MS

Frequency hopping techniquesFrequency hopping techniques

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

Principle of Frequency Hopping


FrequencyFrequency

TimeTime

FF11

FF22

FF33

Call is transmitted through several frequencies toCall is transmitted through several frequencies to•• average the interference (interference diversity)average the interference (interference diversity)•• minimise the impact of fading (frequency diversity)minimise the impact of fading (frequency diversity)

TRXs do not hopTRXs do not hopPhysical channels moved from one TRX to anotherPhysical channels moved from one TRX to another

Hopping sequenceHopping sequencehoppingSequenceNumber (HSN)hoppingSequenceNumber (HSN) 0..630..63

0 = cyclic hopping0 = cyclic hopping1..63 = pseudorandom hopping1..63 = pseudorandom hopping

Base Band Hopping


Baseband HoppingBaseband Hopping

TRX 1TRX 1

TRX 2TRX 2

TRX 3TRX 3

00 11 7722 TimeslotTimeslot

TRX 4TRX 4

BCBCCHCH

f 1f 1

f 2f 2

f 3f 3

f 4f 4

HSN1HSN1 (BB hopping group 1 and RF hopping)(BB hopping group 1 and RF hopping)Timeslot 0 hops over TRXs 2Timeslot 0 hops over TRXs 2--4 only4 only

BCCH does not hopBCCH does not hop

HSN2HSN2 (BB hopping group 2)(BB hopping group 2)Timeslots 1Timeslots 1--7 hop over all TRXs7 hop over all TRXs

RF HoppingStandard technique

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

mobileAllocationListmobileAllocationList Setting of ARFCN values Setting of ARFCN values usedMobileAllocationusedMobileAllocation (MAL)(MAL) 0,1...20000,1...2000 0 = BTS detached from any list0 = BTS detached from any list

1..2000 = indicates list which shall be used1..2000 = indicates list which shall be used


TRX 1TRX 1

TRX 2TRX 2

TRX 3TRX 3

00 11 7722 TimeslotTimeslot

TRX 4TRX 4

BCBCCHCH f1 f1 –– no hoppingno hopping

f2,f3..fn f2,f3..fn –– hopping accordinghopping accordingmobile allocation list mobile allocation list

One hopping sequenceOne hopping sequencenumber onlynumber only

Standard techniqueStandard technique

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

Freeform hoppingFreeform hopping

For every sector For every sector samesamemobile allocation listmobile allocation listhopping sequence numberhopping sequence numberframe number (frame synchronization)frame number (frame synchronization)

RF HoppingFreeform Hopping

MAIO Offset MAI

TRX-1 (BCCH) -

TRX-2 0

TRX-3 1

TRX-4 2

TRX-5 (BCCH) -

TRX-6 3

Sector-1 0


frame number (frame synchronization)frame number (frame synchronization)

For every sector For every sector differentdifferentstarting points for hopping sequencestarting points for hopping sequencepossible by mobile allocation index offsetpossible by mobile allocation index offset

maioOffsetmaioOffset (MO)(MO) 0..620..62

setting of MAIOsetting of MAIO

9 hopping 9 hopping hoppinghopping frequencies MAI = 0..8frequencies MAI = 0..89 frequencies available for every TRX9 frequencies available for every TRX

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-2 3

Freeform hoppingFreeform hopping

•• Not adequate for MA list with consecutive ARFCN Not adequate for MA list with consecutive ARFCN valuesvalues•• Avoids coAvoids co--channel interference but not adjacent channel interference but not adjacent channel interferencechannel interference

Flexible MAIO managementFlexible MAIO management

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

0Sector-1 2


Flexible MAIO managementFlexible MAIO management

MAIO increases with constant step size from one TRX MAIO increases with constant step size from one TRX to the next oneto the next one

maioStepmaioStep (MS)(MS) 1..621..62

maioOffsetmaioOffset = 0, 6, 12 for sector 1, 2, 3= 0, 6, 12 for sector 1, 2, 3maioStepmaioStep = 2= 218 frequencies required (2 * number of hopping TRXs )18 frequencies required (2 * number of hopping TRXs )

TRX-6 6

TRX-7 8

TRX-8 10

TRX-9 (BCCH) -

TRX-10 12

TRX-11 14

TRX-12 16

Sector-3 2

6

12

Sector-2 2

BCCHBCCH

Band allocation:Band allocation:

Flexible MAIO managementFlexible MAIO managementMAIO Offset + MAIO StepMAIO Offset + MAIO Step

BCCHBCCH

Band allocation:Band allocation:

Freeform hoppingFreeform hoppingMAIO OffsetMAIO Offset

RF Hopping (Tight Frequency Reuse)


MA listMA listConsecutive ARFCNConsecutive ARFCN

Only BCCH frequency planning requiredOnly BCCH frequency planning requiredOnly BCCH frequency planning requiredOnly BCCH frequency planning required

MA listMA listNonNon--adjacent ARFCNadjacent ARFCN

MA list and BCCH frequency planning requiredMA list and BCCH frequency planning requiredMA list and BCCH frequency planning requiredMA list and BCCH frequency planning required

Date post:	08-Apr-2016
Category:	Documents
Upload:	teguh-yulianto
View:	28 times
Download:	1 times

BSSPAR 1 Radio Resource Admin

Documents