Proposal on Full L3 Relay
Document Number: IEEE S802.16m-09_2443
Date Submitted: 2009-11-06
Source:
Yuqin Chen, Mary Chion, Yang Liu
E-mail: chen.yuqin@zte.com.cn
ZTE Corporation
Venue:
Base Contribution: C80216m-09_2443
Re : P802.16m/D2
Purpose:
Discussion and approval of the proposal into the IEEE P802.16m/D2
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• L2 Data/L3 Control
– [1] shows the performance comparison between L2
Relay and L2 Data/L3 Control Relay and proposes the scheme for L2 Data/L3 Control Relay;
• Analysis of Cons:
– STIDs for AMSs are insufficient because actually they belong to the scope of ABSs.
– Different processing for data plane and control plane, which causes ARS different from ABS;
– Some signaling messages (REG, DSX) for control are required to get to ABS;
• Full L3 Relay is proposed.

– Control Plane:
• R6 interface terminates on the RS;
• R6 messages can be carried over AAI_L2-XFER
MAC management messages between the RS and
BS.
– Downlink: BS performs classification, removes the higher layer headers, keeps the message contents intact 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.

– Data Plane:
• Downlink: GRE packet is de-tunneled by BS and the MS MAC PDUs are encapsulated into Relay
MAC Packet and transmitted to the RS ;
• Uplink: MS MAC PDUs are encapsulated into
Relay MAC PDU by the RS.

ARS IP Address
MAC
PHY
R6 Control
Message
UDP
IP
MAC
PHY
ARS
IP
MAC
PHY
ABS
IP
L2
L1
R6 Control
Message
UDP
IP
L2
L1
ASN- GW

ARS IP Address
MAC
PHY
GRE
IP
MAC
PHY
ARS
IP
MAC
PHY
ABS
IP
L2
L1
GRE
IP
L2
L1
ASN- GW

Radio link bearer (relay
MAC PDU)
AMS1 ABS-ASN GW bearer
AMS 2/3
Radio interface
ARS
AMS2 GRE Packet
AMS3 GRE Packet
ABS
AMS2 GRE packet
AMS3 GRE packet
ASN GW
IP packet
AMS1 GRE tunnel
Radio interface
MS1 BS RS1
MS3
MS2