Microsoft PowerPoint - IMT-Advanced Relay-20100604.pptKanchei (Ken)
Loa ()
[email protected]
06/04/2010
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III’s Contributions in 4G Standards
• IEEE 802.16j (16j Relay) – 253 major contributions had been
submitted – 116 contributions had been approved as standard
baselines – 37.54% of total approved contributions in 16j – Ranked
#2 (Nortel ranked #1)
• IEEE 802.16m (Relay & Femtocell) – 05/2010 – 274 major
contributions have been submitted – 141 contributions have been
approved as standard baselines
• 3GPP LTE-A (LTE-A Relay) – 05/2010 – 57 major contributions have
been submitted – 28 contributions have been treated with 13
approved/agreed
• III has been focus on building relay & femtocell essential
patents in IEEE 802.16 and 3GPP LTE-A
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Relay Applications
Problems: 1. Shadow of buildings 2. Valley between buildings 3.
Coverage extension at cell edge
Advantages of Relay • Expands Coverage/Penetration • Improves
Capacity and QoS • Lower CAPEX & OPEX approach
to expand WiMAX infrastructure • Decreases MS power
consumption
and Increases battery life • Load sharing and multi-path
redundancy: reduces costs • Spectrally efficient
architectures:
reduces costly antenna structures
Advantages of Relay • Expands Coverage/Penetration • Improves
Capacity and QoS • Lower CAPEX & OPEX approach
to expand WiMAX infrastructure • Decreases MS power
consumption
and Increases battery life • Load sharing and multi-path
redundancy: reduces costs • Spectrally efficient
architectures:
reduces costly antenna structures
Fixed Infrastructure
1. IEEE 802.16-2009 published in 2009, which incorporated IEEE
802.16j
• Work-in-progress standards 1. IEEE 802.16m Relay
– P802.16m/D6
2. 3GPP LTE-Advanced Relay – 36.912 – 36.814 – 36.806 (RAN2/RAN3
internal TR) – 36.300 (R2-102659 CR to 36.300 on relaying)
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MR data protocol stack for RS in centralized security mode
MR data protocol stack for RS in distributed security mode
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TDD versus FDD • In terms of duplex scheme • TDD (Time Division
Duplex)
– Transmit and Receive are time-division on single frequency • FDD
(Frequency Division Duplex)
– Transmit and Receive are performed on a pair of frequencies • A
802.16 frame structure is divided into a DL subframe and a UL
subframe
– In TDD, the UL subframe is followed by the DL subframe – In FDD,
the DL subframe and the UL subframe are transmitted on different
frequencies
time
frequency
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STR versus TTR • In terms of RS’s capability of handling dual RF
modules • STR (Simultaneous Transmit and Receive) relaying
– Definition in 802.16j /D9 3.121 • a relay mechanism where
transmission to subordinate station(s) and reception from the
superordinate
station, or transmission to the superordinate station and reception
from subordinate station(s) are performed simultaneously.
– RS’s RF module handles TX and RX on distinct RF modules
simultaneously, – Able to retain the same frame structure as
802.16e
• TTR (Time-division Transmit and Receive) relaying – Definition in
802.16j /D9 3.123
• a relay mechanism where transmission to subordinate station(s)
and reception from the superordinate station, or transmission to
the superordinate station and reception from subordinate station(s)
is separated in time.
– RS’s RF module handles TX and RX on distinct RF modules at
different time – Frame structure may differ from 802.16e
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Relay/Duplex Modes • TDD/FDD is distinguished by duplex scheme •
TTR/STR is distinguished by RS’s relaying capability of
handling dual RF modules
Non-transparent RS • A non-transparent RS transmits preamble,
FCH
and DL-/UL-MAP • MS recognizes the non-transparent RS as a BS •
Centralized scheduling or distributed scheduling • Capacity
enhancement & range extension
Transparent RS • A transparent RS does not transmit preamble,
FCH and DL-/UL-MAP • MS never recognizes the transparent RS as a BS
• Centralized scheduling at MR-BS • Capacity enhancement only • UL
only RS or UL/DL RS
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– Transparent or non-transparent – Time-division Transmit &
Receive (TTR) or
Simultaneously Transmit & Receive (STR) – Fixed RS or mobile RS
– Two-hop or multi-hop – Centralized or distributed scheduling –
Centralized or distributed security – Centralized control – RS
group
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R6 termination on the RS • R6 logical termination is on the
RS
– R6 is expected to be enhanced for 16m by NWG • R6 messages can be
carried over AAI_L2-XFER MAC management
message between the RS and BS. – Downlink: BS performs
classification, and sends it using AAI_L2-XFER,
addressed to the STID of the RS and with FID=1 – Uplink: RS sends
the message using AAI_L2-XFER to the BS with FID=1.
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forwarded in ARS’s transport flow
ABS interpreates data message and forwards the data in ARS’s
transport flow
AMS
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finalize the 16m relay standard • No STR relay in 802.16m/D6
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LTE-A Relay • LTE-A Relay Node (RN)
1. Type I RN – Range extension – Architecture Studied at RAN1, RAN2
and RAN3
2. Type II RN – Throughput enhancement within an eNB cell – Being
discussed in RAN1 – Similar to Transparent RS of 802.16j
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• Non-transparent • Distributed scheduling • Distributed security •
Distributed control
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LTE-A Type I RN • Type I RN has its own cell ID • Appears as Rel-8
eNB to Rel-8 UEs • TDM Tx/Rx at RN
– Utilize MBFSN subframe for eNB-RN DL transmission – Maintain
backward-compatibility to Rel-8 UE – New Un interface for the link
between RN & DeNB
DeNBUE RN
Uu Un
IP
UDP
GTP
IP
SCTP
S1-AP
IP
SCTP
X2-AP
X2-AP
X2-CP
SCTP
X2-AP
SCTP
X2-AP
Summary 1. RN is an eNB with a wireless backhaul
connection 2. Easy to implement due to reuse the eNB
functionality 3. Inband and out-band Type-1 relays are in
Rel-10
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