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Full‐buffer spectrum efficiency<br />

Evaluated uplink schemes<br />

Single‐input multiple‐output<br />

(SIMO)<br />

Ex)<br />

Multi‐user MIMO<br />

(MU‐MIMO)<br />

Single‐user MIMO (SU‐MIMO) CoMP<br />

Ex) Ex)<br />

© 3GPP 2009 Mobile World Congress, Barcelona, 19 th February 2009<br />

© 3GPP 2009 45<br />

www.4gamericas.org February 2011 Page 157<br />

Ex)<br />

Various schemes have been evaluated<br />

Full‐buffer spectrum efficiency<br />

<strong>DL</strong> control channel overhead assumption<br />

<strong>DL</strong> control Data<br />

L:OFDM symbols (L=1, 2, 3)<br />

1 subframe = 1.0 msec = 14 OFDM symbols<br />

• Downlink performances have been evaluated taking into account the<br />

downlink overhead for L = 1, 2 and 3 cases<br />

• Dynamic assignment of L is supported already in the Rel. 8 specification.<br />

� Average overhead depends on the environments<br />

© 3GPP 2009 Mobile World Congress, Barcelona, 19 th February 2009<br />

© 3GPP 2009 46

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