“From always available to always optimized” · /km 2] No traffic Scenario ... CRS configuration) Access Information ... ›Received index used for –Deriving access information

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CAPITALS

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“From always available to always optimized”

Towards 5G – 5GrEEn system design

Dr. Pål Frenger, Ericsson Research

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Ericsson Confidential | 2014-06-17 | Page 2

› General 5G introduction

› 5GREEN common control plane – P. Frenger, M. Olsson, and E. Eriksson, “A Clean Slate Radio Network Designed for Maximum Energy

Performance” to be presented at PIMRC 2014

Outline

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The networked society

Non-limiting access to information and sharing of data

anywhere and anytime for anyone and anything

The foundation of

mobile telephony

The Networked

Society

The foundation of

mobile broadband

Mobile telephony

for everyone

The evolution of

mobile broadband

~1980 ~2020 ~2000 ~1990 ~2010

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Wide range of

Requirements & Characteristics

Affordable and sustainable

Massive growth in

Traffic Volume

Massive growth in

Connected Devices

• Data rates

• Latency

• Reliability

• Energy performance

• Cost

• .....

Key Challenges

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› Massive deployment of LTE devices in lower bands in 2020

› Introducing new incompatible RAT loss of capacity and service level for

legacy devices

Allow for LTE compatibility in lower bands

5G Spectrum – LTE compatibility

3 GHz 10 GHz 30 GHz 100 GHz

5G “cellular” access (higher performance, wider-area coverage)

5G “mm-wave” access (lower-complexity design, short-range)

LTE compatibility

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CAPITALS

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P. Frenger, M. Olsson, and E. Eriksson, “A Clean Slate Radio Network Designed for Maximum Energy Performance” to be presented at PIMRC 2014

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› What: Separate dedicated functionality from common system functionality

› Why:

– To fully enable usage of advanced (e.g. massive-MIMO) antenna systems

– To significantly enhance network energy performance

– Scalability, peak performance, forward compatibility

› Properties:

– Ultra-lean

– Static

– Stand-alone

5green Common-Control Plane

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› Mandatory transmission of SIBs (in SF5) not shown

Empty LTE Rel-8 sub-frame

How can we

BF the white

resources by

20 dB without

affecting any

of the colored

resources?

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› A cell can never change shape

– RAS, antenna tilt, SON-load balancing, etc

› Massive MIMO beamforming gain M / K

– 400 Tx antenna can give 26 dB beamforming gain

› For non-co-located antennas the path-gain difference can be >> 30 dB

– Near-far effect in UEs

”To fully enable usage of advanced antenna systems”

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Energy consumption for a typical European country-wide LTE network

– Scenario 1: “the most relevant traffic scenario for 2015”

– Scenario 2: “an upper bound on the anticipated traffic for 2015”

– Scenario 3: “an extremity for very high data usage in future networks”

”To significantly enhance network energy performance”

No traffic Scenario 1 Scenario 2 Scenario 30

0.1

0.2

0.3

0.4

0.5

Energy Consumption Load Depencence

1.4% 2.9%7.4%

Are

a P

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[kW

/km

2]

Fixed Energy

Dynamic Energy

No traffic Scenario 1 Scenario 2 Scenario 30

10

20

30

40

50

60

70

80

90

100

110Sub-frame Utilization

Em

pty

sub-f

ram

e r

atio [

%]

95%90%

81%

95% 90%

81% 1.4% 2.9%

7.4%

Em

pty

su

b-f

ram

e r

atio [%

]

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a P

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[kW

/km

2]

No traffic Scenario 1 Scenario 2 Scenario 3 No traffic Scenario 1 Scenario 2 Scenario 3

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› Scalability:

– No need to add more common-signals when densifying networks

– We want to densify only the data plane and not the common-control plane

› Peak Performance:

– User performance gains of up to 350% was reported in the 3GPP NCT studies (R1-133399)

– Low traffic interference is dominated by CRS-based signals SINR is never super-high

› Forward compatibility:

– Best Feature of Rel-8 is the ”MBSFN sub-frames”

– Backhaul, Energy savings, Comp, Multi-hop relaying, etc.

”Scalability, peak performance, forward compatibility”

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› Random access, including distribution of access information

› Paging, including passive mode mobility and location area update

› Positioning and localization

› Time and date provisioning

5green C-CP Functionality

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CAPITALS

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Random access and Access information distribution

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Minimize broadcast

› Spectral efficiency significantly better with unicast compared to broadcast

› Only information related to initial access is broadcasted

– RACH: power, contention, physical resource, response channel

– Access restrictions: PLMN id, CSG

– Routing area

Common

System Information

(e.g. multi-RAT lists)

Node Specific

System Information

(e.g. TM support, CRS configuration)

Access Information

Communicated after initial system access

Communicated after initial node access

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access information Table › Access information tables transmitted with long periodicity (e.g. up to 10.24 s)

› Provide initial access related parameters for one or multiple areas – Macro cells may transmit access information related to small cells

– Enhanced mobility by providing access information related to adjacent areas

› Mapping to table entry using a System signature transmissions more often in time and space (100 ms)

time

frequency

Access

information

tables

System

Signature

Access

information

tables

System

Signature

Positioning RS

(every 500 ms)

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Signature Sequences

› Nodes transmit a “system signature sequence”

– Similar to an LTE synchronization signal (e.g. 9 bits)

– Transmitted every 100 ms

– Does not need to be node specific

› Received index used for

– Deriving access information from the table

– UE Passive mode area update

› Received power used for

– Layer selection

– Open-loop power control

› Received timing used for

– PRACH transmission timing

– Paging window

Nodes transmitting SSS15

Nodes transmitting SSS3

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Non node-specific RACH

› RACH does not have to be “node specific”

– Reduces amount of system information

– Allows for efficient small cell sleep and DTX

– Several nodes may use the same RACH configuration

› Consequences:

– Self-contained random access response (carrying its own pilot and sync)

› The UE may receive multiple random-access responses (RAR)

› Locally unique node ID used to derive locally unique RAR

– Handling of multiple RAR

› Inter node coordination

› “Contention resolution” / RAR selection in UE

RAR

Coordination

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CAPITALS

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Paging and passive mode Mobility

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Separate Active and Passive mode mobility

› Passive mode mobility (or ”idle mode”):

– Paging, Random Access, and Positioning

– Defines system coverage

– Based on system signature sequences

› Active mode mobility

– Handover of active sessions between nodes

– UE speciffic mobility procedure and requirements

– Using additional, explicitly configured, mobility

referencer signals

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Paging

› Self contained messages

– Including synch and demod-RS

– Some synch channels may be shared between multiple UEs

› Paging cycle up to 24 hours

– Timing derived from SI and system signatures

› Paging may be transmitted over smaller area than the system-signature area

”System-signature area”

”Paging area”

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CAPITALS

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Example Use-cases

Legacy assisted operation Forward compatibility

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› Access information table may be provided by LTE

– In MBSFN sub-frames; or

– as an MBMS service;

– as a new SIB

Legacy Assisted operation

time

frequency

5GREEN:

LTE Rel-8:

10.24 s

100 ms

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Forward compatibility

› The data-delated parts of PHY are contained inside a configured radio resource:

– Tactile, ultra low latency

– Low cost MTC

– Ultra reliable

– Extreeme MBB

– Cirquit-switched

– Backhaul

– Public safety

– D2D

– ...

› Several different physical layers can be active in paralell

– Future post-5G-releases will define new physical layers

– All PHYs utilize only configured radio resources

Recipe for failure:

“Design for the union of all

5G requirements”

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Performance Evaluations

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Area power comparison

› LTE Rel-8 (Reference scenario):

– Heterogeneous network, Macro ISD = 500 m

– 3 micro cells per macro cell

› 5GREEN system:

– Access information table: 200 bits transmitted as 2 ms

bursts every 10 seconds

– System signature: 0.7 ms every 100 ms

› EARTH 2012 power models (macro and micro)

LTE Rel8 5GREEN0

0.5

1

1.5

2

2.5

3

3.5

4

Are

a p

ow

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consum

ption [

kW

/km

2]

-88%

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Impact on longer sleep mode

› Assume longer sleep mode enables lower

sleep power consumption

P’sleep = Psleep / sleep

› 95% reduction possible if sleep power can

be reduced 3.5 times

1 2 3 4 5 6 7 8 9 100

5

10

15

20

25

30

35

sleep

Are

a P

ow

er

Gain

rela

tive L

TE

-Rel-8

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Summary

› Decouple system functionality from data functionality

› 5GREEN Common-Control Plane functions and proposed solutions

– Access information distribution: signature sequence and table look-up

– Random access procedure: non-node speciffic, multiple responses

– Paging: self contained message with synch and demod RS

– Passive mode mobility: loose requirements

– Positioning and localization: beacon support integrated from day 1

› Properties: Ultra-lean, Static & Stand-alone

› Energy reduction in the order of 90-95% relative LTE Rel-8

Documents

“From always available to always optimized” · /km 2] No traffic Scenario ... CRS configuration) Access Information ... ›Received index used for –Deriving access information