INNOVATIONS IN 5G BACKHAUL

TECHNOLOGIES 5G AMERICAS WHITE PAPER

JUNE 2020

WWW.5GAMERICAS.ORG

“5G network operators are today faced with an increasing array of choices in designing, architecting, and managing their networks. Operators can now select from a variety of wireless and wireline transport options to address the specific topologies and use cases envisioned for their mobile wireless network.”

Chris Pearson, President, 5G Americas

“While dark fiber reaches 65 percent of macro sites in North America today, further network densification will require operators to leverage other efficient 5G transport options such as HFC, which currently reaches nearly every building on the North American continent.”

Dave Morley, Director, 5G Technology & Operations Shaw Communications

“Optimized backhaul is a key challenge for efficient 5G deployment, and innovative wireless solutions like integrated access and backhaul could be a game changer.”

Ranjeet Bhattacharya, Principal Solutions Director, Ericsson

ENHANCEMENT OF KEY CAPABILITIES

FROM IMT-ADVANCED TO IMT-2020

RADIO ACCESS NETWORK FUNCTIONS

3GPP NG-RAN ARCHITECTURE

FUNCTIONAL SPLIT BETWEEN CENTRAL AND DISTRIBUTED UNITS

POSSIBLE CU, DU AND RU COMBINATIONS

CPRI LINE RATES

TRANSPORT REQUIREMENTS FOR 5G NR FUNCTIONAL SPLITS

INTEGRATED ACCESS AND BACKHAUL (IAB)

FILLING GAPS WITH IAB

IAB PARENT AND CHILD RELATIONSHIP

IAB ARCHITECTURE

IAB TOPOLOGIES:

(A) IAB NODE USING SA MODE WITH NEXT GENERATION CORE (NGC)

(B) IAB NODE USING EN-DC (NSA MODE)

IAB CU/DU ARCHITECTURE

CELL DENSIFICATION USING IAB

Fiber St rong signal high spect ral

eff iciency

Weak signal low spect ral eff iciency

Access

Fiber

AccessAccess

Wireless backhaul

St rong signal/ high spect ral efficiency

IAB donor

IAB node

FILLING COVERAGE HOLES USING IAB

Fiber

Access

Wireless backhaul IAB nodeIAB donor

IAB AS AN ENABLER OF INFRASTRUCTURE-ON-DEMAND

Fiber

IABdonor

Wireless backhaul (1st hop)

Access

Wireless backhaul (2nd hop)

IAB node

Access

IAB node

Access

Fiber

IABnode

IAB donor

IAB AUGMENTING:

INDOOR COVERAGE AND

ENTERPRISE BACKHAUL

TIME DIVISION MULTIPLEXING

① ① ① ① ① ① ① ① ① ①

① ① ① ① ① ① ① ① ① ①

freq

uenc

y

① Parent link

t ime

② ② ② ② ② ② ② ② ② ②

② ② ② ② ② ② ② ② ② ②② Child link

①

②

IAB node 1 IAB node 2

IAB node 3

UE

DYNAMIC TDM SCHEME

D

D D U DBH_D D D BH_U D

D D U D D D U D

BH_PDSCH

0 3 75 6 8 9421

Donor

RN

no BH_PUSCH

no access link transmission AC_PUSCH

D

D D

D D U DBH_D D D BH_U D

D D U D D D U D

no BH_PDSCH

10 13 1715 16 18 19141211

BH_PUSCH

no access link transmission

D

D

AC_PDSCH

FREQUENCY DIVISION MULTIPLEXING

①

②

IAB node 1 IAB node 2

IAB node 3

UE

① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ①

freq

uenc

y

① Parent link

t ime

② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ②② Child link

SPACE DIVISION MULTIPLEXING

① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ①

freq

uenc

y

① Parent link

t ime

② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ②② Child link

① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ① ①

② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ② ②

①

②

IAB node 1 IAB node 2

IAB node 3

UE

MULTIPLEXING OF ACCESS AND BACKHAUL LINKS IN HALF-DUPLEX

MULTIPLEXING OF ACCESS AND

BACKHAUL LINKS IN FULL DUPLEX

INNOVATIONS IN 5G BACKHAUL TECHNOLOGIES

WWW.5GAMERICAS.ORG