Put the SIBs, which were previously phase1 encoded into PER strings, into one or more System Information messages inside TransportBlocks to go in the beacon. We have to run this anew for each beacon because the blocks include the SFN. See 10.2.48 SYSTEM INFORMATION message. See also: 8.1.1.1.3 "Segmentation and concatenation of system information blocks", and there is a picture at Figure 12.1.3-2:
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