- Device to Device Communication has been the latest reasearch topic for LTE advanced. Which enables UE's those are in the proximity to discover and communicate with each other.
- Various use cases involved are
- Social gaming
- Commercial advertisements
- Pubic safety purposes
- Network offloading
- Enormous operator benefits involved using device to device communications such as
- Peak data rates: as the UE's are near by due to which good radio conditions can enables higher modulation schemes.
- Low latency: No need to go through all the network entities involved in data communication.
- Capacity: Due to spectrum re use UE can accommodate more users
- Extended Coverage : UE's in network coverage can provide services to UE's which are present out side of network coverage (Relay operation)
- With the advancement in the technology and social life opened new ways to communication.
- Prose is a feature that enables operator network controlled discovery and communications between UEs that are in proximity.
- It allows UE's in proximity will discover other UE's in their vicinity and start communication directly with less involvement of network.
- Various use cases involved such as location based advertising (Ads by shops to customers passing near by), social networking applications (facebook, twitter),network off loading and Public safety etc.
- The communication path could for example be established directly between the UEs or routed via local eNB(s).
- Open ProSe Discovery: is ProSe Discovery without explicit permission from the UE being discovered.
- Restricted ProSe Discovery: is ProSe Discovery that only takes place with explicit permission from the UE being discovered. UE's can have a feature enabled whether it can be discovered by other UE's are not (privacy).
- Operator can change dynamically the range of the proximity per user/application.
Model A:
- Model A is push model like "i am here". used for both open and restricted discovery.
Model B:
- Model B is pull model like "who are there" or "Are you there". it is used for restricted discovery.
3GPP TR 22.803,3GPP TS 23.303