Integration of Sidelink Procedures in OAI (ProSe Applications) 21/06/2018
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Integration of Sidelink Procedures
in OAI (ProSe Applications) 21/06/2018
Overview of this talk
Background
Objectives
Overview of LTE Sidelink Scenarios
Integrated Features
Next steps
(c) Eurecom 2018
Background
OAI sidelink work is done in the context of the DDPS project – USA NIST project framework program (PSISP)
– Aims to promote LTE technologies for public-safety network, including ProSe Sidelink (PC5) technology demonstrators
– Project coordinator: PerspectaLabs (New Jersey), Dr. Richard C. Lau
– Team members at PerspectaLabs
William Johnson
Heechang Kim
Stephanie Demers
James Hodge
Eric Beck
– Team members at EURECOM
Panagiotis Matzakos
Tien-Thinh Nguyen
Raymond Knopp
Jerome Haerri
(c) Eurecom 2018
OAI Objectives
Integration of Rel 14 Sidelink procedures (L1/L2)
Integration of Rel 14 CN procedures in support of ProSe and UE-Network Relay
Interfaces for ProSe applications in UE
Testing – ProSe application from PerspectaLabs
– Small field deployment with OAI-based UEs and Infrastructure
(c) Eurecom 2018
Side link, SC-FMDA, FDDCellular LTE
in-networkProSe (PC5)
Off-networkProSe (PC5)
Partial-in-networkProSe (PC5) eNB
ProSe Function
EPCS1
PC3
Uu
UE-Network Relay
PC4PC2
ProSeAppl Server
Scenarios
on-network coverage
– Regular LTE Iu-interface communications
off-network coverage
– PC5 interface
partial coverage.
– UE-to-network relay procedures
New Communication modes support
– one-to-one
– one-to-many direct communication.
(c) Eurecom 2018
OAI extensions for ProSe
PC5-D: The discovery plane of PC5 interface is needed for direct discovery. Discovery allows a UE to discover other UEs that are in proximity. The ProSe Protocol interacts directly with the MAC layer
PC5-S: The PC5 signaling protocol stack is used for control plane signaling over the PC5 interface to establish, maintain, and release a secure direct link between two UEs.
PC5-U: The user plane PC5 interface is used to send traffic directly between two UEs. A UE may establish multiple logical channels, which is not show in Figure 3. A logical channel ID (LCID) included within the MAC subheader uniquely identifies a logical channel within the scope of one Source Layer-2 ID and ProSe Layer-2 Group ID combination. Note that in our OAI ProSe implementation, the IP tables are responsible for IP to sidelink radio bearer (SLRB) mapping. The UE_ip.ko kernel module uses the information provided by the IP tables in order to route each ProSe flow to the right SLRB.
PC3: The control plane PC3 interface is used for service authorization between the UE and the ProSe Function when the UE is connected to the network (i.e., on-network). The ProSe control signaling is carried over the LTE user plane (i.e., LTE-Uu, S1-U, S5/S8 and SGi) Note that the PC3 interface is not used when the UE is off-network. In the off-network case, service authorization is pre-configured in the UE.
(c) Eurecom 2018
L1 features
PC5 Synchronization
– Implementation of SynchRef UE (SPSS,SSSS,PSBCH)
– Implementation of synchronization and tracking procedures for
off-network UEs
PC5
– Implementation of TX/RX procedures for PSSCH/PSCCH
(c) Eurecom 2018
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