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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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3 Nokia Siemens Networks
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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4 Nokia Siemens Networks
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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.
.
.
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)
26 TDMA frames = 120 ms
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
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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
51 TDMA frames = 235 ms
1 51
Signalling Channel Mapping(BCCH + SDCCH/4 + SACCH/C4)
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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
51 TDMA frames = 235 ms
1 51
Signalling Channel Mapping(BCCH +CCCH/9)
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f
f
i = idle TDMA frame
f
51 TDMA frames = 235 ms
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
51 TDMA frames = 235 ms
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
SDCCH traffic (Erl/cell) 4.166667
Location update
LU / Call 1
authentication and ciphering (sec) 7
authentication and ciphering sec => Erl 0.001944
SDCCH traffic (Erl/cell) 0.972222
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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