4G/LTE - Protocol

RB Size allocation for each System Bandwidth

For Resource Allocation Type 0 which is the most common resource allocation type, there is a rules for DL_RB setting

• if System BW = 1.4 M, it should be multiples of 1 (1 x n)
• if System BW = 3 M, it is should be multiples of 2 (2 x n)
• if System BW = 5 M, it should be multiples of 2 (2 x n)
• if System BW = 10 M,it should be multiples of 3 (3 x n)
• if System BW = 15 M, it should be multiples of 4 (4 x n)
• if System BW = 20 M, it should be multiples of 4 (4 x n)

This rule is derived from the Resource Block Group(RBG) size for each bandwidth, and the RBG size for system bandwidth is shown in TS 36.213 Table 7.1.6.1-1. (Number of DL RB should should be the multiples of RBG for the corresponding system bandwidth)

< 36.213 - Table 7.1.6.1-1: Type 0 resource allocation RBG size vs. Downlink System Bandwidth >

* Reference for additional restriction and details :

TS 36.104 Table 5.6.1 for DL (Number of RBs for each System BW),

< Table 5.6-1 Transmission bandwidth configuration NRB in E-UTRA channel bandwidths >

TS 36.211 Section 5.3.3 for UL. Number of UL RB should meet the following requirement.

Possible Number of RBs for UL : (Due to the rules stated in TS 36.211 Section 5.3.3. You can only have following numbers which can be used for UL)

           1,2,3,4,5,6,8,9,10,12,15,16,18,20,24,25,27,30,32,36,40,45,48,50,54,60,64,72,75,80,81,90,96,100