Embodiments of the present disclosure propose a method for addressing MAC protocol data units which include MOB_PAG-ADV messages in an attempt to improve the success rate of decoding BS broadcast paging messages. The device issues a certificate request to a Certification Authority. 5 cm is prepared, and it is pressed against the surface of the light guide with its reflective face being in contact with the surface of the light guide under a load of 135 gcm2 thereto, and, in that condition, when it is reciprocated 10 times on the surface of the light guide to a width of 5 cm every time at a speed of 2. The Group III nitride layer comprises at least one Group III element and nitrogen. The forming of the trench includes: flattening a substrate surface; and etching to form the trench after flattening. The video decoder may use one or more pictures in the reference picture list as reference pictures to perform inter prediction on one or more video blocks of a picture.