The mapping from VRBs to physical resource blocks (PRBs) allows for downlink distributed transmission in frequency domain .Downlink distributed transmission consists of two separate steps:
(1) a mapping from VRB pairs to PRB pairs such that consecutive VRB pairs are not mapped to frequency-consecutive PRB pairs and
(2) a split of each resource-block pair such that the two resource blocks of the resource-block pair are transmitted with a certain frequency gap in between. The second step can be seen as frequency hopping on a slot basis.
Lot of documents explain you the importance of VRB. Please go throuh them.
Regards
Venu
(1) a mapping from VRB pairs to PRB pairs such that consecutive VRB pairs are not mapped to frequency-consecutive PRB pairs and
(2) a split of each resource-block pair such that the two resource blocks of the resource-block pair are transmitted with a certain frequency gap in between. The second step can be seen as frequency hopping on a slot basis.
Lot of documents explain you the importance of VRB. Please go throuh them.
Regards
Venu
