Relay 2011 07 15 Seung June Yi seungjune

Relay 2011. 07. 15 Seung. June Yi: seungjune. yi@lge. com Copyright Notification . No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. ⓒ 2011. LG 3 GPP RAN 2 team. All rights reserved. LG Electronics RAN 2 Team

Purpose De. NB BAD Two main purposes Coverage extension for isolated area Throughput enhancement for coverage hole LG Electronics RAN 2 Team

Overall Architecture Network Element for Relay Network Element for UE Relay-UE MME S 1 -MME(relay) Uu Relay e. NB UE S 11 (Relay) De. NB Un Relay-UE SGW/PGW Relay-GW (Optional) S 1 -MME(UE) S 1 -U(UE) User-UE SGW/PGW S 11 (UE) User-UE MME LG Electronics RAN 2 Team

Proxy functionality I am talking to the MME directly! UE is connected to the De. NB! De. NB plays S 1/X 2 -AP and S-GW proxy role for RN De. NB appears to RN as § Control plane: MME for S 1, e. NB for X 2 § User plane: S-GW LG Electronics RAN 2 Team

Relay Type 1: Inband relay - Un and Uu links are isolated in time One subframe Normal subframe: RN UE One subframe RN subframe: De. NB RN RN subframe configuration When is RN subframe? RN subframe allocation LG Electronics RAN 2 Team

Relay Type-1 a: Outband - Un and Uu links are isolated in frequency Type-1 b: Inband - Outgoing and incoming signals are isolated in the spatial domain → Not considered in Rel-10 LG Electronics RAN 2 Team

Protocol Stacks Control Plane NAS RRC PDCP RLC MAC PHY UE PDCP RLC MAC PHY S 1/X 2 -AP SCTP IP PDCP RLC MAC PHY RN S 1/X 2 -AP SCTP IP IP PDCP L 2 RLC MAC PHY L 1 De. NB NAS S 1/X 2 -AP SCTP IP L 2 L 1 MME/e. NB Issues of Architecture Design User Plane App TCP/UDP IP PDCP RLC MAC PHY UE GTP-U UDP IP PDCP RLC MAC PHY RN GTP-U UDP IP IP PDCP RLC L 2 MAC PHY L 1 De. NB IP GTP-U UDP IP L 2 L 1 SGW/e. NB LG Electronics RAN 2 Team

Issue: Header Overhead Two-layer headers on Un interface App TCP/UDP IP GTP-U UDP IP PDCP RLC MAC PHY GTP-U UDP IP IP GTP-U UTP IP L 2 L 1 LG Electronics RAN 2 Team

Bearer Mapping Un RB – Uu RB UE EPS bearer - Un RB IP flow - UE EPS bearer per-Qo. S mapping LG Electronics RAN 2 Team

Integrity Protection for Un DRB RRC S 1/X 2 -AP SCTP IP PDCP RLC MAC PHY RN S 1/X 2 -AP SCTP IP PDCP RLC MAC PHY NAS S 1/X 2 -AP L 2 L 1 SCTP IP De. NB S 1/X 2 message is transmitted on DRB in Un interface Integrity protection as well as ciphering and header compression is applied for Un DRB SCTP IP MME/e. NB PDCP PDU format for Un DRB D/C R R R PDCP SN (cont. ) Data MAC-I (cont. ) LG Electronics RAN 2 Team

RN Startup Procedure – Phase I: Attach for RN preconfiguration RN De. NB MME OAM RN PWR ON RRC Connection Access to a De. NB as a UE UE attach procedure Attach to MME as a UE Download initial RN configuration RN goes to IDLE Download De. NB Cell list LG Electronics RAN 2 Team

RN Startup Procedure – Phase II: Attach for RN operation RN De. NB RRC Connection MME OAM Access as a RN to one of attachable De. NB -indicates “I’m a RN” -indicates “I need RN subframe allocation” UE attach procedure Attach to MME as a RN Download RN configuration RRC Reconfiguration RN subframe allocation Download RN configuration specific to the De. NB Start RN operation LG Electronics RAN 2 Team

Rel-10 RN simplification Deployment scenario simplification No RN mobility No multi-hop RN No inter-RN handover Radio protocol simplification No additional header compression No data forwarding at handover No flow control in Un interface No Semi-Persistent Scheduling No TTI bundling No MBMS on Relay LG Electronics RAN 2 Team