| CPC H04W 72/02 (2013.01) [H04W 72/0446 (2013.01); H04W 72/21 (2023.01); H04W 72/23 (2023.01)] | 12 Claims |

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1. A method for performing, by a first apparatus, sidelink communication, the method comprising:
transmitting a first transport block to a second apparatus on a resource allocated from a base station, before transmitting an on-demand system information request message requesting first system information;
transmitting the on-demand system information request message to the base station, at a first time point;
transmitting a second transport block to the second apparatus on an exceptional resource pool within a time interval from the first time point at which the on-demand system information request message is transmitted and until a second time point at which the first system information is received from the base station, based on the on-demand system information request message being transmitted to the base station; and
receiving the first system information related to the on-demand system information request message, from the base station, at the second time point.
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