LTE-Advanced Relay

 

 

LTE-Advanced Relay

 

 

   Basic System Model For Multi-User System.png

 

Relay case with One cell Base Station and Multiple UE.png

 

               

            Long Term Evolution (LTE) technology is the most efficient the most efficient mobile broadband technology

             for providing an excellent user experience. It offers the highest data rates and shortest latency times.


            Relay transmission can be seen as a kind of collaborative communications, in which a relay station (RS) helps

            to forward user information from neighboring user equipment (UE)/mobile station (MS) to a local eNode-B (eNB)/

            base station (BS). Relays that receive and retransmit the signals between base stations and mobiles can be used

            to effectively  increase throughput extend coverage of cellular networks.Relaying enhances coverage and capacity.

            The UEs communicate with the relay node, which in turn communicates with a donor eNB.

 

 

           Amplify-and-Forward(AF)

AF.PNG

 

          Plus
           - Simple and inexpensive functions 
           - Minimal impact on standard specifications
             (specifications on repeater performance defined in Release 8)
          Minus
           - Noise Amplification simultaneously with desired signals. 

 

 

           Decode-and-Forward(DF)

DF.PNG

         Plus

           - Elimination of Noise

          Minus

           - Processing delay due to modulation/de-modulation

             and encoding and decoding

           - Radio control functions must be added between

             base station and relay station

 

 

            DeModulate-and-Forward(DMF) 

    

DMF.png

 

         Plus

          - Elimination of noise
          - Small impact on standard specifications
         Minus
         -  Processing delay due to modulation/demodulation and

            encoding and decoding
         - Layer 3 processing delay (user-data regeneration
           processing etc.)

 

 

Paper             Smart Cooperative Relay Scheme in LTE-Advanced System