Wireless Test World 2009
Agilent, Your Partner in Advancing
Agilent, Your Partner in Advancing
New
NewWireless
WirelessCommunications
Communications
LTE Protocol
Signaling and
Control
Presented by:
Choi, In-Hwan
July 1, 2009
Page 1
Wireless Test World 2009
Agenda
•
1 page Introduction to LTE
•
LTE signalling and control
•
• Pre-connection (idle mode) procedures and control
– Cell Selection, re-selection
– System information and Master information
• Connection procedures and control
– RRC controls
– Paging, (P)RACH
– Scheduling, resource allocation
• Voice/Data transfer (connected mode) processes and control
– DCI, Power control, Timing control, UCI
– HARQ, CQI
Summary and Agilent LTE solutions
Page 2
LTE signaling and control in 45m
November 2008
LTE major features
Feature
Capability
Access modes
FDD with frame structure 1
TDD with frame structure 2
Variable channel BW
1.4, 3, 5, 10, 15, 20 MHz FDD and TDD
(1.6 MHz & 3.2 MHz TDD bandwidths now deleted)
Baseline UE capability
20 MHz UL/DL, 2 Rx, one Tx antenna
User Data rates
(at baseline capability)
DL 172.8 Mbps / UL 86.4 Mbps @ 20 MHz BW
(2x2 DL SU-MIMO & SISO on UL) with 64QAM
Downlink transmission
OFDMA using BPSK, QPSK, 16QAM, 64QAM
Uplink transmission
SC-FDMA using BPSK, QPSK,16QAM, 64QAM
DL Spatial diversity
Open loop TX diversity
Single-User MIMO up to 4x4 supportable
UL Spatial diversity
Optional open loop TX diversity, 2x2 MU-MIMO, Optional 2x2 SU-MIMO
Bearer services
Packet only – no circuit switched voice or data services are supported
Î voice must use VoIP
Page 3
LTE signaling and control in 45m
November 2008
Agenda
•
1 page Introduction to LTE
•
LTE signalling and control
•
• Pre-connection (idle mode) procedures and control
– Cell Selection, re-selection
– System information and Master information
• Connection procedures and control
– RRC controls
– Paging, (P)RACH
– Scheduling, resource allocation
• Voice/Data transfer (connected mode) processes and control
– DCI, Power control, Timing control, UCI
– HARQ, CQI
Summary and Agilent LTE solutions
Page 4
LTE signaling and control in 45m
November 2008
Diagram of the various UE states
GSM_Connected
CELL_DCH
Handover
E-UTRA
RRC CONNECTED
Handover
GPRS Packet
transfer mode
CELL_FACH
CELL_PCH
URA_PCH
CCO with
optional
NACC
Reselection
Connection
establishment/release
Connection
establishment/release
UTRA_Idle
CCO,
Reselection
Reselection
Connection
establishment/release
Reselection
E-UTRA
RRC IDLE
GSM_Idle/GPRS
Packet_Idle
CCO, Reselection
Idle Mode
Cell selection
System Information
Page 5
Call/data setup
Paging
RACH
Connected
Call/data control
Data flow
LTE signaling and control in 45m
November 2008
Agenda
•
1 page Introduction to LTE
•
LTE signalling and control
• Pre-connection (idle mode) procedures and control
– Cell Selection, re-selection
– System information and Master information
•
Page 6
• Connection procedures and control
– RRC controls
– Paging, (P)RACH
– Scheduling, resource allocation
• Voice/Data transfer (connected mode) processes and control
– DCI, Power control, Timing control, UCI
– HARQ, CQI
Summary and Agilent LTE solutions
LTE signaling and control in 45m
November 2008
Idle mode processes
Page 7
LTE signaling and control in 45m
November 2008
Idle mode processes
Why have a “camped” idle mode state?
1. It enables the UE to receive system information from the PLMN.
•
The UE will use the System Information to measure suitable candidates for cell reselection/mobility
2. If the UE needs to establish an RRC connection, it initially accesses the
network (via RACH) on the control channel of the cell on which it is camped.
3. If the PLMN receives a call for the registered UE, it knows the UE’s location.
It can then send a Paging Message for the UE on control channels of the
cells in this location/area. The UE is monitoring the control channel of the cell
on which it is camped.
•
•
Page 8
UE will re-register its location should it move from one tracking area to another
If a UE was always in a “connected” state, it would consume more resources.
LTE signaling and control in 45m
November 2008
Master and System Information
36.300 7.4, 36.331 5.2
•
System information is divided into the MasterInformationBlock (MIB) and a number of
SystemInformationBlocks (SIBs):
•
MasterInformationBlock defines the most essential physical layer information of the cell
required to receive further system information, eg System Frame Number, Cell
Bandwidth
•
Only the MIB and SIB1 have fixed periodicity and resource allocation – SIB2-9 are
scheduled within SIB1 which also contains Tracking Area ID, Cell ID, PLMN identities etc
•
The Paging message is used to inform UEs in idle mode and UEs in connected mode
about a system information change.
•
System information may also be provided to the UE by means of dedicated signalling
e.g. upon handover – in this case the dedicated signalling content take precedence.
Page 9
LTE signaling and control in 45m
November 2008
Master and System Information
36.300 7.4, 36.331 5.2
•
Release 7 and earlier – Both MIB and SIB’s transmitted on the BCH
•
Release 8 i.e. LTE – ONLY the MIB is transmitted on the BCH, all other SIB’s
transmitted on DL-SCH
MIB
SIB1
SIB2-9
Periodicity
40ms
80ms
Resources
Fixed #
Fixed *
Scheduling
Fixed
Fixed
Flexible
Indicated by
SIB1
Mapped to
BCCH
BCCH
BCCH
Transport CH
BCH
DL-SCH
DL-SCH
Identifier
N/A
N/A
SI-RNTI
# First MIB in sub-frame #0 for which SFN mod 4=0, subsequently in sub-frame #0
* First SIB1 in sub-frame #5 for which SFN mod 8=0, subsequently in sub-frame #5 when SFN mod 2=0
Page 10
LTE signaling and control in 45m
November 2008
System Information
•
SystemInformationBlockType1 contains information relevant when evaluating if a UE is allowed to
access a cell and defines the scheduling of other system information blocks;
•
SystemInformationBlockType2 contains common and shared channel information;
•
SystemInformationBlockType3 contains cell re-selection information, mainly related to the serving cell;
•
SystemInformationBlockType4 contains information about the serving frequency and intra-frequency
neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a
frequency as well as cell specific re-selection parameters);
•
SystemInformationBlockType5 contains information about other E-UTRA frequencies and interfrequency neighbouring cells relevant for cell re-selection (including cell re-selection parameters
common for a frequency as well as cell specific re-selection parameters);
•
SystemInformationBlockType6 contains information about UTRA frequencies and UTRA neighbouring
cells relevant for cell re-selection (including cell re-selection parameters common for a frequency as
well as cell specific re-selection parameters);
•
SystemInformationBlockType7 contains information about GERAN frequencies relevant for cell reselection (including cell re-selection parameters for each frequency);
•
SystemInformationBlockType8 contains information about CDMA2000 frequencies and CDMA2000
neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a
frequency as well as cell specific re-selection parameters);
•
SystemInformationBlockType9 contains a home eNB identifier (HNBID).
Page 11
LTE signaling and control in 45m
November 2008
Agenda
•
1 page Introduction to LTE
•
LTE signalling and control
•
• Pre-connection (idle mode) procedures and control
– Cell Selection, re-selection
– System information and Master information
• Connection procedures and control
– RRC controls
– Paging, (P)RACH
– Scheduling, resource allocation
• Voice/Data transfer (connected mode) processes and control
– DCI, Power control, Timing control, UCI
– HARQ, CQI
Summary and Agilent LTE solutions
Page 12
LTE signaling and control in 45m
November 2008
RRC Signalling – high level
•
RRC Connection Establishment
•
RRC Connection Reconfiguration
• Establish, modify or release user radio bearers, e.g. during handovers
•
RRC Connection Re-establishment
• Re-activates security (without algorithm change)
• Only if cell is prepared (maintains context), and security is active
• Used if coverage temporarily lost, e.g. during Handover
UE
EUtran
UE
EUtran
RRC CONNECTION REQUEST
RRC CONNECTION REQUEST
RRC CONNECTION SETUP
RRC CONNECTION REJECT
RRC CONNECTION SETUP
COMPLETE
Page 13
LTE signaling and control in 45m
November 2008
RRC Signalling bearers
RRC Signalling
Radio Bearer
Control Plane
signalling
Message
contents
Priority
SRB 0
CCCH
Non-UE specific
Low
SRB 1
DCCH
RRC +NAS
High
SRB 2
DCCH
NAS only
Low
•
SRB 2 is only setup AFTER security has been enabled
•
NAS messaging on SRB1 only occurs if SRB2 has not yet been
established. If piggy backed messaging is used, then these procedures will
have joint success/failure criteria
•
Security Overview in 36-300, Section 14
Page 14
LTE signaling and control in 45m
November 2008
RRC Signalling – Mobility control
•
Idle Mode mobility controlled by SIB information
•
Connected Mode – use RRC reconfiguration, RRC also configures:
• Neighbour Cell Measurements dedicated RRC messages over-ride lists
sent in SIB’s
• Measurement GAPs
• Reporting – periodic or event triggered
UE
EUtran
HANDOVER FROM EUTRA
PREPARATION REQUEST
•
•
Page 15
Inter-RAT mobility handled by:
MOBILITY FROM EUTRA COMMAND
Preceded by further messaging if moving to
CDMA2000 – requires additional preparation
for the target network/cell
Handovers to
CDMA2000 RAT Only
UL HANDOVER
PREPARATION TRANSFER
MOBILITY FROM EUTRA
COMMAND
LTE signaling and control in 45m
November 2008
Paging – e.g. incoming call or change in SI
36.304 sec 6.1, 36.331 sec 5.3.2.3
•
RRC configures paging message to the UE over PCCH logical channel
•
UE will monitor PCH to received the Paging Message which could also
indicate System Information change notifications in Idle mode.
• Paging information identified by P-RNTI
• System Information indentified by SI-RNTI
•
When the Paging Message indicates changes to System Information then
UE needs to reacquire all System Information .
•
The UE may use Discontinuous Reception (DRX) in idle mode in order to
reduce power consumption - When DRX is used the UE needs only to
monitor one P-RNTI per DRX cycle.
Page 16
LTE signaling and control in 45m
November 2008
Random Access
Figure 10.1.5.1-1: Contention
based Random Access Procedure
UE
1
• 5 possible RA events
1.Initial Access
2.Following Radio Link failure
3.Handover
4.DL data arriving during RRC_Connected
5.UL data arriving during RRC_Connected
• 2 types
• Contention based (all 5 events)
• Non-contention based (only applies to 3, 4)
eNB
Random Access Preamble
Random Access Response
3
2
Scheduled Transmission
Contention Resolution
4
• In the frequency domain, the random access
preamble occupies a bandwidth corresponding to 6
resource blocks 36.211 section 5.7.1
• Preamble sequence is one of 64 zadoff chu
sequences in each cell. The
RACH_ROOT_SEQUENCE used by the UE is
broadcast as part of the System Information
Figure 10.1.5.2-1: Non-contention
based Random Access Procedure
Page 17
LTE signaling and control in 45m
November 2008
Random Access Timing
1.
UE sends pre-amble, one of 64 randomly selected (listed in SI)
2.
UE monitors PDCCH during the Random Access Response Window
(variable length) starting 3 sub-frames after the end of the pre-amble,
message contents in PDSCH on same sub-frame
3.
UE transmits on PUSCH using resources assigned in message 2 on
PDSCH
Random Access Response window
Sub-frame #0
#1
#2
#3
Page 18
#1
#5
2. PDCCH Random
Access Response
1. PRACH
Sub-frame #0
#4
#2
#3
#4
#5
#6
#7
#8
2. PDSCH Random
Access Response
#6
#7
#9
3. Scheduled
UL resources
#8
#9
LTE signaling and control in 45m
November 2008
LTE 3GPP - MAC Scheduling
• MAC’s main function is the distribution and
management of common uplink and downlink
resources to multiple UE’s
UE 1
• eNB MAC must take account of:
• Overall traffic volume
• UE QoS needs for each connection type
• Buffer reports etc
• If a UE requests resources via a Scheduling
request, the eNB may provide a scheduling
grant identified by Cell –RNTI (C-RNTI)
Page 19
UE 4
UE 3
LTE signaling and control in 45m
November 2008
Agenda
•
1 page Introduction to LTE
•
LTE signalling and control
•
• Pre-connection (idle mode) procedures and control
– Cell Selection, re-selection
– System information and Master information
• Connection procedures and control
– RRC controls
– Paging, (P)RACH
– Scheduling, resource allocation
• Voice/Data transfer (connected mode) processes and control
– DCI, Power control, Timing control, UCI
– HARQ, CQI
Summary and Agilent LTE solutions
Page 20
LTE signaling and control in 45m
November 2008
Information required by UE to transmit/receive
•
UE’s need to know a lot of information before sending or receiving data
Uplink
Downlink
When the UE can transmit and on which
resources
When the UE should “listen” for DL data. DL data
may not be contiguous in frequency
Which modulation, transport block size
and redundancy version to use
Which modulation, transport block size and
redundancy version were used to transmit this data
Adjustments to align timing with eNB
Is this downlink spatially multiplexed
Whether to hop the PUSCH or not
For Spatially multiplexed DL what pre-coding has
been applied
Power level
Which HARQ process does this data belong to
Transmit new block or re-transmit
NACK’d blocks
Is this new data or re-transmitted data
•
ALL of this information is send from the eNB to the UE on the Downlink
Control Information (DCI)
Page 21
LTE signaling and control in 45m
November 2008
Downlink Control Information (DCI)
•
Downlink Control Information (DCI) is carried on the Physical Downlink Control
Channel
•
eNB could send many of these messages per sub-frame using multiple
PDCCH’s. Each DCI is intended to be received by one or several UE’s
•
DCI recipients are distinguished by RNTI, masked into message CRC
•
Only the intended recipient(s) can therefore decode the relevant DCI
•
However the UE still has to attempt to detect all DCI’s
•
UE’s could have several RNTI’s active at any time
•
DCI messages are used for scheduling Paging or System Information,
Random Access responses and for control of established UL-SCH or DL-SCH
•
Paging information identified by P-RNTI
•
System Information indentified by SI-RNTI
•
UL Scheduling in response to a Random Access request identified by RA-RNTI
•
Established UL-SCH or DL-SCH identified by UE specific C-RNTI (Cell-RNTI)
Page 22
LTE signaling and control in 45m
November 2008
Downlink Control Information (DCI)
formats
DCI
Format
Payload
Usage
0
UL-SCH assignments
RB Assignments, TPC, MCS, PUSCH hopping flag,
CQI request
1
DL-SCH assignments
RB Assignments, TPC, HARQ, MCS
1A
DL-SCH assignments (compact)
RB Assignments, TPC, HARQ, MCS, RA
1B
DL-SCH assignments (compact with precoding)
RB Assignments, TPC, HARQ, MCS
TPMI, PMI
1C
DL-SCH assignments (VERY compact)
RB Assignments
1D
DL-SCH assignments (compact with precoding and power offset)
RB Assignments, TPC, HARQ, MCS
TPMI, DL Power offset
2
DL-SCH assignments for closed loop MIMO
RB Assignments, TPC, HARQ, MCS, pre-coding
2A
DL-SCH assignments for open loop MIMO
RB Assignments, TPC, HARQ, MCS, pre-coding
3
TPC commands for PUSCH and PUCCH
with 2 bit power adjustments
Power control, e.g. USER1, USER2, USER….etc
using TPC-PUCCH-RNTI and TPC-PUSCH-RNTI
3A
TPC commands for PUSCH and PUCCH
with single bit power adjustments
Power control, e.g. USER1, USER2, USER….etc
using TPC-PUCCH-RNTI and TPC-PUSCH-RNTI
Page 23
LTE signaling and control in 45m
November 2008
Downlink Control Information (DCI)
timing
•
DCI for DL scheduling
•
Sent to many UE’s
•
DCI DL scheduling applies to resources on the same sub-frame as the DCI
Sub-frame #0
#1
#2
DCI received for
DL assignment
Sub-frame #0
•
#1
#3
#4
#5
Scheduled
DL resources
#2
#3
#4
#6
#7
DCI received for
UL assignment
#5
#6
#7
#8
#9
Scheduled
UL resources
#8
#9
DCI for UL scheduling
•
Only ever sent to a single UE, identified by RNTI masked into CRC
•
DCI UL scheduling applies to resources 4 sub-frames after the DCI was sent
Page 24
LTE signaling and control in 45m
November 2008
PUSCH Uplink Power Control
36.213 sec 5
•
The setting of the UE Transmit power for the physical uplink shared channel
(PUSCH) transmission in sub-frame i is defined in dBm by:
PPUSCH (i ) = min{PMAX ,10 log10 ( M PUSCH (i )) + PO_PUSCH ( j ) + α ( j ) ⋅ PL + ∆ TF (i ) + f (i )}
•
When the number of resource blocks increases, the overall available
integrated power level increases
•
Essentially this is a single calculation which is transformed from open loop to
closed loop (eNB) control with the α component. When α =0 we have closed
loop control and the MS calculated open loop component is eliminated
∆ TF (i ) is a cell specific boosting factor which increases with data rate so that
•
S/N can be improved when using the higher modulation schemes
•
Power control is adjusted with increments: f (i ) includes the TPC command
•
TPC values are carried in the DCI and depend on DCI format
•
PUCCH has a similar, but different equation, as does PRACH
Page 25
LTE signaling and control in 45m
November 2008
Other controls on DL - MAC Control Elements
36.321
•
Several controls are multiplexed into MAC messaging
• The Timing Advance field indicates the timing adjustment (granularity 0.52 µs = 16×Ts)
that a UE has to apply. The value is derived from the timing of uplink transmissions as
measured by the eNB. UE adjusts timing 6 sub-frames after receipt of command.
• The Buffer Size field identifies the total amount of data available across all logical
channels of a logical channel group after the MAC PDU has been built.
–
Indicated in number of bytes, and includes:
• All data that is available for transmission (and any re-transmissions) in the RLC
layer and in the PDCP layer
• The size of the RLC and MAC headers are not considered in the buffer size
computation
• The Power Headroom reporting procedure is used to provide the serving eNB with
information about the difference between the UE TX power and the maximum UE TX
power
• Discontinuous Reception (DRx). The UE may be configured by RRC with a DRx
functionality that allows it to monitor the PDCCH discontinuously to save battery life
• Contention resolution information
Page 26
LTE signaling and control in 45m
November 2008
UCI on the PUCCH or PUSCH
Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel
carries the Uplink Control Information CQI and ACK/NACK, and also scheduling
requests
Format
Bits per
sub-frame
Payload
Mod’n
1
N/A
No Ack/Nack, only SR
N/A
1a
1
SISO Ack/Nack
BPSK
1b
2
MIMO Ack/Nack
QPSK
2
20
CQI, no Ack/Nack
QPSK
2a *
21
CQI + SISO Ack/Nack
B/QPSK
2b *
22
CQI + MIMO Ack/Nack
B/QPSK
The number and position of Demodulation Reference Signal symbols will vary
depending on format
* For normal CP only
Page 27
LTE signaling and control in 45m
November 2008
LTE 3GPP - MAC HARQ
• N-Process Stop and Wait HARQ – similar to that of 3G
• Downlink
• Asynchronous Adaptive HARQ (variable turnaround time)
• PUSCH or PUCCH used for ACK/NACKS for DL (re-)transmissions
• PDCCH signals the HARQ process number and if re-transmission or
transmission
• Uplink
• Synchronous HARQ (turnaround time of 8ms)
• Maximum number of re-transmissions configured per UE
• PHICH used to transmit ACK/NACKs for non-adaptive UL (re-)transmissions.
Adaptive re-transmissions are scheduled through PDCCH
• 8 UL HARQ processes
• MAC HARQ can also interact with RLC to provide information to speed up RLC
ARQ re-segmentation and re-transmission.
Page 28
LTE signaling and control in 45m
November 2008
Synchronous H-ARQ (UL transmission)
•
UL LTE utilises synchronous H-ARQ
•
Each H-ARQ processes is always sent at fixed 8 sub-frame intervals
•
Ack/Nacks are sent on DL PHICH 4 frames after receipt of UL frame, i.e. Ack/Nack on subframe 6 for data in sub-frame 2 as shown in the diagram below
Sub-frame #0 #1
#2
#3
#4
#2
#3
#6
#7
#8
#9 Sub-frame #0 #1
ACK/NACK from
eNB on PHICH
HARQ
Process n
Sub-frame #0 #1
#5
#4
#5
#6
#7
#2
#9
#0
#1
#4
#5
#6
#7
#8
#9
#6
#7
#8
#9
ACK/NACK from
eNB on PHICH
Next HARQ
Process n
#8
#3
#2
#3
#4
#5
Fixed 8 sub-frame (8ms) interval
Page 29
LTE signaling and control in 45m
November 2008
Asynchronous H-ARQ (DL transmission)
•
DL LTE utilises asynchronous H-ARQ
•
Each H-ARQ process could have variable timing, the eNB can transmit as soon as it
receives the ACK/NACK from the UE on the uplink PUCCH
Sub-frame #0 #1
#2
#3
#4
#5
Fixed 4 sub-frame interval
Sub-frame #0 #1
#2
#3
#4
#5
#6
#7
Variable
interval
#6
#8
#9 Sub-frame #0 #1
Fixed 4 sub-frame interval
#7
#8
ACK/NACK from UE on
PUCCH or PUSCH
Page 30
Next HARQ
Process n
Next HARQ
Process n
DL HARQ
Process n
#9 Sub-frame #0 #1
#2
#3
#4
#5
#6
#7
#8
#9
#3
#4
#5
#6
#7
#8
#9
Variable
interval
#2
ACK/NACK from UE on
PUCCH or PUSCH
LTE signaling and control in 45m
November 2008
HARQ Link Adaptation
•
Retransmissions of a particular HARQ process use the same modulation and coding
scheme as the initial transmission. Each subsequent retransmission simply reduces
the effective code rate through incremental redundancy – there are 4 redundancy
versions for LTE
•
Link adaptation (AMC: adaptive modulation and coding) with various modulation
schemes and channel coding rates is applied to the shared data channel.
•
AMC optimises the transmission performance of each UE while maximizing the system
throughput.
•
•
If we use too low a modulation depth e.g. QPSK during good radio conditions, then we are
utilizing more bandwidth (for a given desired data rate) than we need to
•
If we use too high a modulation depth in poor conditions, we end up with too many retransmissions
•
Either way we are not making efficient use of the resources available
Channel Quality Indicator (CQI) is the means by which the channel conditions are
reported to the eNB to optimise AMC process.
Page 31
LTE signaling and control in 45m
November 2008
LTE 3GPP Channel Quality Indictor (CQI)
36.213 section 7.2
• CQI reports can be
• Wideband or per sub-band
• Semi static, Higher Layer Configured or UE selected
single or multiple sub-bands
• CQI only, or CQI plus Pre-coding Matrix Indicator
(PMI)
• Transmitted on PUCCH for sub-frames with no
PUSCH allocation or PUSCH with or without
scheduling grant or if no UL-SCH
• Depends on spatial multiplexing
• Reports can be periodic or aperiodic (when signaled
by DCI format 0 with CQI request field set to 1)
• The eNB need not necessarily use the CQI reported
from the UE
CQI
index
modulati
on
0
coding rate x
1024
efficiency
out of range
1
QPSK
78
0.1523
2
QPSK
120
0.2344
3
QPSK
193
0.3770
4
QPSK
308
0.6016
5
QPSK
449
0.8770
6
QPSK
602
1.1758
7
16QAM
378
1.4766
8
16QAM
490
1.9141
9
16QAM
616
2.4063
10
64QAM
466
2.7305
11
64QAM
567
3.3223
12
64QAM
666
3.9023
13
64QAM
772
4.5234
14
64QAM
873
5.1152
15
64QAM
948
5.5547
36.213 Table 7.2.3-1: 4-bit CQI Table
Page 32
LTE signaling and control in 45m
November 2008
Channel Quality Indication CQI on Uplink
Channel Information (UCI) 36.213 Section 7.2
Transmission Mode
Payload
Single-antenna port;
port 0
UE selected sub-band CQI + wide-band CQI or
Higher Layer Configured wide-band and sub-band CQI, no PMI
Transmit diversity
UE selected sub-band CQI + wide-band CQI or
Higher Layer Configured wide-band and sub-band CQI, no PMI
Open-loop spatial
multiplexing
UE selected sub-band CQI + wide-band CQI or
Higher Layer Configured wide-band and sub-band CQI, no PMI
Closed-loop spatial
multiplexing
Wide-band CQI per codeword + PMI for each sub-band or
UE selected sub-band and wide-band CQI per codeword + PMI or
Higher Layer Configured wide-band and sub-band CQI + PMI
Multi-user MIMO
Higher Layer Configured wide-band and sub-band CQI + PMI
Closed-loop Rank=1
pre-coding
Wide-band CQI per codeword + PMI for each sub-band or
UE selected sub-band and wide-band CQI per codeword + PMI or
Higher Layer Configured wide-band and sub-band CQI + PMI
Single-antenna port;
port 5
Not yet defined
Page 33
LTE signaling and control in 45m
November 2008
Agenda
•
1 page Introduction to LTE
•
LTE signalling and control
•
• Pre-connection (idle mode) procedures and control
– Cell Selection, re-selection
– System information and Master information
• Connection procedures and control
– RRC controls
– Paging, (P)RACH
– Scheduling, resource allocation
• Voice/Data transfer (connected mode) processes and control
– DCI, Power control, Timing control, UCI
– HARQ, CQI
Summary and Agilent LTE solutions
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LTE signaling and control in 45m
November 2008
LTE signalling and control in 45m Summary
• Signal and Channel mapping - simple but effective – only 2 modes
connected and idle
• MIB, SIB’s – provision of essential cell information, HO cell lists
• Connection processes - Paging and RACH – very similar to 3G processes
• DCI – Carries all the UE control instructions such as power control,
scheduling, assignments, pre-coding etc
• Scheduling controlled by multiple variants of RNTI
• UCI – Carries HARQ, CQI, resource requests
• UL Power control – simple compared with W-CDMA
• MAC control elements – Buffer reporting, Timing Advance etc
• HARQ – very stressful for UE, 8ms Turnaround Time 1ms TTI
• CQI – sub-band and wide-band, plus MIMO - much more complex
compared to W-CDMA – but essential to optimise the shared channel
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LTE signaling and control in 45m
November 2008
Agilent and Anite
Industry Leaders Partnering to Deliver
World Class LTE Development Solutions
Providing scalable test solutions to address the complete R&D life
cycle for LTE mobile development.
• Anite and Agilent are partnering to deliver industry leading UE LTE R&D test
solutions.
• Anite will provide industry leading development, conformance and
interoperability protocol test solutions for LTE
• Agilent will be providing an industry leading RF platform, OBT based solutions
and RF conformance solutions for LTE.
• These solutions will use a common RF hardware platform and a common
protocol stack providing a truly scalable solution to address all phases of UE
development – enabling customers to bring LTE UEs to market faster and more
efficiently.
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LTE signaling and control in 45m
November 2008
Agilent 3GPP LTE Portfolio
Coming
Soon!
Software Solutions
• ADS LTE Design
Libraries
• N7624B Signal Studio
• 89601A VSA Software
VSA, PSA, ESG, Scope, Logic
NEW!
E6620A Wireless
Communications
Platform
Agilent/Anite SAT LTE –
Protocol Development
Toolset
Drive Test
PXB R&D
MXA/MXG
R&D
Coming
Soon!
Coming
Soon!
Distributed
Network
Analyzers
Digital VSA
Network Analyzers, Power supplies, and More!
R&D
Page 37
Signalling
Agilent/Anite SAT LTE – UE Protocol
Conformance Development Toolset
Conformance
Network
LTE signaling and control in 45m
November 2008
Resources
•
Agilent LTE Page: www.agilent.com/find/lte
•
•
E6620A Page: www.agilent.com/find/e6620a
•
•
•
E6620A Photo Card
LTE Brochure
Anite web site: www.anite.com
•
•
Wall chart (poster)
http://www.anite.com/images/userdocuments/AniteLTE.PDF
Other Agilent LTE Webcasts:
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•
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Concepts of LTE: http://www.techonline.com/learning/webinar/201801263
LTE Protocol Primer: http://www.techonline.com/learning/webinar/207800310
LTE Measurements: http://www.techonline.com/learning/webinar/208403979
SC-FDMA: http://www.techonline.com/learning/webinar/206101979
Mimo: http://www.techonline.com/learning/webinar/210102164
LTE signaling and control in 45m
November 2008
Q&A
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LTE signaling and control in 45m
November 2008