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1 1 GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSGeneral Packet Radio Services
(Placeholder for a cover picture; this picture should alwayscover the whole slide width as shown here)
GPRS Air Interface aspects
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSPhysical resource
GPRSLogical channels
GPRSAllocation ofphysical resource
2
Your Lecturer is:
Reiner StuhlfauthRohde&Schwarz
Training Center, Munich
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSPhysical resource
GPRSLogical channels
GPRSAllocation ofphysical resource
3
Structure of presentation
�GPRS - Physical resource
�GPRS - Logical channels
�GPRS - Allocation of physical resource
Outline of Presentation
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSPhysical resource
GPRSLogical channels
GPRSAllocation ofphysical resource
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GPRS Radio Interface GPRS-Burst-Types
Abbreviations :T=Tail Bit (3 Bits/ 8 Bits in leading part of Access BurstF=Flag (1 Bit)G=Guard Period (8,25 Bits/ 68,25 Bits in Access Burst)
T3
T3
T3
T3
T3
T3
T3
T3
T8
57 data bits 57 data bits 26 BitsTraining Sequence
F1
F1 G
8,25
G8,25
G8,25
G8,25
G68,25
142 fixed Bits
64 BitsExtended Training Sequence39 data bits 39 data bits
142 fixed Bits
36 data bits T3
41 BitsTraining Sequence
Normal Burst
Frequency Correction Burst
Synchronisation Burst
Dummy Burst
Access Burst
GPRS uses thesame Burst types asknown from GSM
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSPhysical resource
GPRSLogical channels
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5
GPRS Radio Interface: Common Features to GSM
•GPRS needs Circuit Switched Signalling:FCCH, SCH and BCCH
•GPRS uses GSM Normal Burst for data transport:
•GPRS uses same Modulation: GMSK
TInformation F GInformationFTrainings- sequence
3 57 1 26 31 57 8,25T
T = Tailbits F = Flagbits G = Guardtime
GPRS Radio Interface
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
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0 1 2 3 4 5 6 7
Signalling: BCCH + FCCH + SCH + CCCH
Circuit switched channels Packet switched channelsPDCH
Capacity on demand: Provides circuit switchedchannels and packet switched channels in a dynamicmanner
Example: Cell with 1 Frequency channel: 1 physical channel for signalling, 4 physical channels for circuit switched TCHand 3 physical channels for packet switched PDCH
GPRS Capacity on Demand
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSPhysical resource
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0 1 2 3 4 5 6 7TN
FN = Frame number TN = Timeslot number
= 1 Frame
0 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 7 0 1 2 3 4 5 6 70 1 2 3 4 5 6 7
Mapping of TCH and PDCH on a frequency channel
GSM TCH: Traffic channel in circuit switched mode, 26-Multiframe
12 x TCH 12 x TCH S I
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Frequency channel
GPRS PDCH:1 Radio Block =4 Bursts
GPRS PDCH:1 Radio Block =4 Bursts
GPRS PDCH: Traffic or signalling channel in packet switched mode
FN
S = SACCH
GPRS Physical Resource
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSPhysical resource
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GPRSAllocation ofphysical resource
8
0 1 2 3 4 5 6 7TN
FN = Frame number TN = Timeslot number
= 1 Frame
0 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 7 0 1 2 3 4 5 6 70 1 2 3 4 5 6 7
Reminder: Mapping of GSM-TCH on a frequency channel
GSM TCH: Traffic channel in circuit switched mode, 26-Multiframe
12 x TCH 12 x TCH S I
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Frequency channel
GPRS PDCH:1 Radio Block =4 Bursts
GPRS PDCH:1 Radio Block =4 Bursts
GPRS PDCH: Traffic or signalling channel in packet switched mode
FN
S = SACCH
GPRS Physical Resource
GSM-TCH:1 Timeslot in Uplink and Downlink direction,
using the 26 Multiframe
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
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0 1 2 3 4 5 6 7TN
TN = Timeslot number
= 1 Frame
0 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 70 1 2 3 4 5 6 7 0 1 2 3 4 5 6 70 1 2 3 4 5 6 7
Mapping of GPRS-PDCH on a frequency channel
GPRS PDCH:1 Radio Block =4 Bursts
GPRS PDCH:1 Radio Block =4 Bursts
GPRS Physical Resource
1 Radio Blockis the smallesttransport unitin GPRS!
2 Radio Blocksmay belong to 2 different users!=> sharing of physical resources
Radio Block transmits signalling or data
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
GPRSPhysical resource
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GSMPhysical resource = 1 Timeslot on 1 Frequency Channel
e.g. ARFCN + TN
GPRS, using Temporary Block Flow to identify radio resourcePhysical resource = N Radio Blocks (=4 Normal Bursts) on 1 or more Timeslots. Temporary Block Flow, TBF identifies allocated physical resource
Allocation of physicalresource
Downlink Uplink
Symmetric data transfer
Downlink Uplink Downlink Uplink
Symmetric data transfer Asymmetric data transfer
fixed
dynamic
Extended dynamic
or
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4
downlink
uplink
GPRS Physical Resource
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Physical Resource
TBF:A Temporary Block Flow is a physical connection usedby two entities to transport Packet Data Units on a packet data physical channel.
TFI:A Temporary Flow Identifier is assigned to every TBF. The TBF is identified by the TFI together with the direction.
TBF = TFI + Direction
GPRS General Packet Radio ServicesAir interface aspects
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GPRS: Additional Logical Channels
PBCCH
Signallingand Control
PacketTraffic Channels
PCCCH
PPCH
PRACH MS initiates uplink transfer
PAGCH Resource assignment to an MS
PNCH Notifying PtM Packet Transfer
Broadcast of packet dataspecific information
PDTCH Packet Data Transfer; (multislot)
PACCH
DL
UL
DL
DL
DL
DL & ULPTCH
Signalling: resource allocation,acknowledgements, PC, TA, etc.
Paging MSs for packet dataand circuit switched services
PDCH: Packet Data Channel:
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio Interface
Logical Channel ComparisonCIRCUIT SWITCHED GSM PACKET SWITCHED GPRS
FCCH No Direct EquivalentSCH No Direct EquivalentBCCH PBCCHPCH PPCHRACH PRACHAGCH PAGCHNCH PNCHSDCCH PCCCH/PACCHTCH PDTCHSACCH PACCHSACCH PTCCHFACCH PACCH
CCCH PCCCH
PDCH
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio InterfaceChannel Combinations
CIRCUIT SWITCHED (51 MFM)i) TCH/F + FACCH/F + SACCH/TFii) TCH/H(0,1) + FACCH/H(0,1) + SACCH/TH(0,1)iii) TCH/H(0,0) + FACCH/H(0,1) + SACCH/TH(0,1) + TCH/H(1,1)iv) FCCH + SCH + BCCH + CCCHv) FCCH + SCH + BCCH + CCCH+SDCCH/4(0..3)+SACCH/C4(0..3)vi) BCCH + CCCHvii) SDCCH/8(0 .7) + SACCH/C8(0 . 7)viii) TCH/F + FACCH/F + SACCH/Mix) TCH/F + SACCH/Mx) TCH/FD + SACCH/MD
GPRS (52 MFM)xi) PBCCH+PCCCH+PDTCH+PACCH+PTCCHxii) PCCCH+PDTCH+PACCH+PTCCHxiii)PDTCH+PACCH+PTCCH
where CCCH = PCH + RACH + AGCH + NCH and PCCCH=PPCH+PRACH+PAGCH+PNCH.
3 new channelcombinations in
GPRS
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GPRS: Signalling InformationSignalling Information about GPRS
Circuit switched
BCCH
PDCH additional PDCH
PBCCH PCCCH
Complete GPRS Info
orPointer to PBCCH
Existence mandatory Existence optional Existence optional
GPRS-Info,GPRS Signalling
AdditionalGPRS-Info
GPRS General Packet Radio ServicesAir interface aspects
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GPRSPhysical resource
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GPRS: Signalling Information
Broadcast Control Channel
Common Control Channels
Packet Broadcast ControlChannel
Packet Common ControlChannels
Com
plex
ity
GPRS General Packet Radio ServicesAir interface aspects
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GPRSPhysical resource
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1 2 3 40
1 2 3 40
1 2 3 40
47 48 49 5046
22 23 24 2521
48 49 50 5147
1 2 53 4 60 7 1 2 53 4 60 7 1 2 53 4 60 7
Multiframes used in GSM and GPRS51-Multiframe: GSM-Signalling
26-Multiframe: GSM-Traffic
52-Multiframe: GPRS-Signalling and Traffic
GPRS + GSM Multiframes
GPRS General Packet Radio ServicesAir interface aspects
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B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
B0 - B11 = Radio Blocks T = Frame used for PTCCH X = Idle frame
52 TDMA Frames
52 - Multiframe Structure for PDCH
NB NB NB NB1 Radio Block = 4 TS in consecutive TDMA Frames
Uplink-Multiplexing:PDTCH & PACCH
PDTCH, PACCH & PRACH
or
Downlink-Multiplexing:PDTCH & PACCHPDTCH & PACCH & PCCCHincl. PBCCHPDTCH & PACCH & PCCCHwithout PBCCH
GPRS Multiframe
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio Interface
B0 B1 B2 T B3 B4 B5 X B6 B7 B8 T B9 B10 B11 X
PTCCH
GPRS Timing Advance on PTCCH
Position of PTCCH on 52-Multiframe
52 Frames
PTCCH is anew logical
channel in GPRS
PTCCH is anew logical
channel in GPRS
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
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GPRS Radio Interface
timeslot n timeslot n+1
Guard Period8,25 bit periods
Burst in timeslot n
Burst in timeslot n+1
PowerRamping
GSM Timing Advance and Guard Period
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio Interface
GSM Timing Advance and Guard Period
BTS MS
BTS sends Timing Advance value to each MS individually to eliminatedelay time effects
MS starts transmitting „Timing Advance“-bit periods earlier to be at the BTS sideright in time
GPRS General Packet Radio ServicesAir interface aspects
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GPRSPhysical resource
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GPRS Radio Interface
PTCCH / Uplink
PTCCH / Downlink
= 1 Access Burst
= 1 Radio Block = 4 Normal Bursts
Packet Timing Advance Control Channel, PTCCH
MS sends Access Burst on uplinkNetwork sends Control Message on downlink
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio Interface
B0 B1 B2 T B3 B4 B5 X B6 B7 B8 T B9 B10 B11 X
PTCCH
GPRS Timing Advance on PTCCH
52 Frames
PTCCH / Uplink
PTCCH / Downlink
= 1 Access Burst
= 1 Radio Block = 4 Normal Bursts
MS has 2 possibilities within 52 Multiframe, butnetwork needs 4 Normal Burst to transmit the message!
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio Interface52-multiframe number n:
uplink TAI=0 TAI=1B0 B1 B2 0 B3 B4 B5 1 B6 B7 B8 2 B9 B10 B11 3
downlink TA_message 1 TA message 1
52-multiframe number n + 1:
uplink TAI=2 TAI=3B0 B1 B2 4 B3 B4 B5 5 B6 B7 B8 6 B9 B10 B11 7
downlink TA message 1 TA message 1
52-multiframe number n + 2:
uplink TAI=4 TAI=5B0 B1 B2 8 B3 B4 B5 9 B6 B7 B8 10 B9 B10 B11 11
downlink TA message 2 TA message 2
52-multiframe number n + 3:
uplink TAI=6 TAI=7B0 B1 B2 12 B3 B4 B5 13 B6 B7 B8 14 B9 B10 B11 15
downlink TA message 2 TA message 2
52-multiframe number n + 4:
uplink TAI=8 TAI=9B0 B1 B2 16 B3 B4 B5 17 B6 B7 B8 18 B9 B10 B11 19
downlink TA message 3 TA message 3
52-multiframe number n + 5:
uplink TAI=10 TAI=11B0 B1 B2 20 B3 B4 B5 21 B6 B7 B8 22 B9 B10 B11 23
downlink TA message 3 TA message 3
52-multiframe number n + 6:
uplink TAI=12 TAI=13B0 B1 B2 24 B3 B4 B5 25 B6 B7 B8 26 B9 B10 B11 27
downlink TA message 4 TA message 4
Operation of PTCCH on 52 MultiframeC
ombining 8 tim
es the52 M
ultiframe
to get a PTCC
H-M
ultiframe
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio Interface52-multiframe number n:
uplink TAI=0 TAI=1B0 B1 B2 0 B3 B4 B5 1 B6 B7 B8 2 B9 B10 B11 3
downlink TA_message 1 TA message 1
52-multiframe number n + 1:
uplink TAI=2 TAI=3B0 B1 B2 4 B3 B4 B5 5 B6 B7 B8 6 B9 B10 B11 7
downlink TA message 1 TA message 1
52-multiframe number n + 2:
uplink TAI=4 TAI=5B0 B1 B2 8 B3 B4 B5 9 B6 B7 B8 10 B9 B10 B11 11
downlink TA message 2 TA message 2
52-multiframe number n + 3:
uplink TAI=6 TAI=7B0 B1 B2 12 B3 B4 B5 13 B6 B7 B8 14 B9 B10 B11 15
downlink TA message 2 TA message 2
52-multiframe number n + 4:
uplink TAI=8 TAI=9B0 B1 B2 16 B3 B4 B5 17 B6 B7 B8 18 B9 B10 B11 19
downlink TA message 3 TA message 3
52-multiframe number n + 5:
uplink TAI=10 TAI=11B0 B1 B2 20 B3 B4 B5 21 B6 B7 B8 22 B9 B10 B11 23
downlink TA message 3 TA message 3
52-multiframe number n + 6:
uplink TAI=12 TAI=13B0 B1 B2 24 B3 B4 B5 25 B6 B7 B8 26 B9 B10 B11 27
downlink TA message 4 TA message 4
Operation of PTCCH on 52 Multiframe
TAI = TimingAdvance Identifierto define the Frame,where the MS is allowed to transmit one Access Burston the PTCCH/uplink
GPRS General Packet Radio ServicesAir interface aspects
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GPRS Radio Interface52-multiframe number n:
uplink TAI=0 TAI=1B0 B1 B2 0 B3 B4 B5 1 B6 B7 B8 2 B9 B10 B11 3
downlink TA_message 1 TA message 1
52-multiframe number n + 1:
uplink TAI=2 TAI=3B0 B1 B2 4 B3 B4 B5 5 B6 B7 B8 6 B9 B10 B11 7
downlink TA message 1 TA message 1
52-multiframe number n + 2:
uplink TAI=4 TAI=5B0 B1 B2 8 B3 B4 B5 9 B6 B7 B8 10 B9 B10 B11 11
downlink TA message 2 TA message 2
52-multiframe number n + 3:
uplink TAI=6 TAI=7B0 B1 B2 12 B3 B4 B5 13 B6 B7 B8 14 B9 B10 B11 15
downlink TA message 2 TA message 2
52-multiframe number n + 4:
uplink TAI=8 TAI=9B0 B1 B2 16 B3 B4 B5 17 B6 B7 B8 18 B9 B10 B11 19
downlink TA message 3 TA message 3
52-multiframe number n + 5:
uplink TAI=10 TAI=11B0 B1 B2 20 B3 B4 B5 21 B6 B7 B8 22 B9 B10 B11 23
downlink TA message 3 TA message 3
52-multiframe number n + 6:
uplink TAI=12 TAI=13B0 B1 B2 24 B3 B4 B5 25 B6 B7 B8 26 B9 B10 B11 27
downlink TA message 4 TA message 4
Operation of PTCCH on 52 Multiframe
Network transmits Timing Advance ControlMessage with length of 4 Normal Burs ts
on PTCCH/Downlink
GPRS General Packet Radio ServicesAir interface aspects
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27
GPRS Allocation of physical resource
Allocation of physicalresource
fixed
dynamic
Extended dynamic
Allocation of physical resources can be done belonging3 different modes. Fixed and dynamic allocation is mandatory, extended dynamic allocation is optional.
GPRS General Packet Radio ServicesAir interface aspects
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downlink
USFRadio Block B(n)
USF = R1
USF = R2
USF = R3
USF =R4
uplink
Radio Block B(n+1)
Monitoring USF in Block B(n)Sends in Block B(n+1) or in Blocks B(n+1) - B(n+4)
GPRS Dynamic AssignmentUSF = Uplink State Flag
USF sent in downlink Radio Blockpoints to the user of the next
uplink Radio Block (or the next 4 Radio Blocks, if USF Granularity bit is set)
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
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downlink
USFRadio Block B(n)
USF = R1
USF = R2
USF = R3
USF =R4
uplink
Radio Block B(n+1)
Monitoring USF in Block B(n)Sends in Block B(n+1) or in Blocks B(n+1) - B(n+4)
GPRS Extended Dynamic AllocationUSF = Uplink State Flag
USF allowing to transmit 1 or 4 Radio Blocks on that PDCH and on all higher
numbered assigned PDCH’s
GPRS General Packet Radio ServicesAir interface aspects
1MAT | 09.09.02 |
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B0 - B11 = Radio Blocks T = Frame used for PTCCH X = Idle frame
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
52 TDMA Frames
Timeslot Allocation0 1 2 3 4 5 6 700001011Assigned TimeslotsBitmap example
Allocation Bitmap
010111000110111000111000101001100111
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
TN4
TN6
TN7
PDCH
= not assigned Radio Block = assigned Radio Block
example
GPRS Fixed Assignment
GPRS General Packet Radio ServicesAir interface aspects
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B0 - B11 = Radio Blocks T = Frame used for PTCCH X = Idle frame
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
52 TDMA Frames
Timeslot Allocation0 1 2 3 4 5 6 700001011Assigned TimeslotsBitmap example
Allocation Bitmap
010111000110111000111000101001100111
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
TN4
TN6
TN7
PDCH
= not assigned Radio Block = assigned Radio Block
example
GPRS Fixed Assignment
1. Element of fixed assignment: Timeslot Allocation
Vector with 8 elements whichassigns the timeslots that may beused by the MS for the data transfer
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B0 - B11 = Radio Blocks T = Frame used for PTCCH X = Idle frame
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
52 TDMA Frames
Timeslot Allocation0 1 2 3 4 5 6 700001011Assigned TimeslotsBitmap example
Allocation Bitmap
010111000110111000111000101001100111
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
B9 B10 B11B6 B7 B8B3 B4 B5B0 B1 B2 T X XT
TN4
TN6
TN7
PDCH
= not assigned Radio Block = assigned Radio Block
example
GPRS Fixed Assignment
2. Element of fixed assignment: Allocation Bitmap
Matrix with Nx12 elements: 12 lines, corresponding to the12 Radio Blocks within the 52 Multiframe.N columns, depending on theN assigned timeslots withthe Timeslot Allocation Vector
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Mobile Originated Packet TransferMobile Originated Packet Transfer
MS Net-work
Packet Channel Request1
2 Packet Immediate Assignment
Packet Resource Request3
4 Packet Resource Assignment
PAGCH or AGCH
PRACH or RACH
PACCH
PACCH
Phase One Access
Phase Two Access
(optional)
Packet Channel Request1
2 Packet Immediate Assignment
Packet Resource Request3
4 Packet Resource Assignment
PAGCH or AGCH
PRACH or RACH
PACCH
PACCH
Phase OneAccess
Phase Two Access(optional)
GPRS Packet Data Transfer
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GPRS Packet Data Transfer
Mobile originated data transfer: GPRS channel request
Channel request via RACH
Packet Channel requestvia PRACH
Single block establishment
One phase access request
One phase access request
or
Short access request
Two phase access request
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GPRS Packet Data Transfer
Network originated data transfer
Common Control Channels
Common Control Channels
Packet Common Control Channels
Packet switched paging
Circuit switched paging
Circuit switched paging
Packet switched paging
or
GPRS General Packet Radio ServicesAir interface aspects
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GPRSPhysical resource
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GPRSAllocation ofphysical resource
36
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