Question: Upon receiving a MasterInformationBlock message in E-UTRA, what action does a UE in RRC_IDLE (or in RRC_CONNECTED with T311 running) take if it lacks valid system information for the cell, regarding downlink and uplink bandwidth configuration?
Option 1: Apply the received dl-Bandwidth value to both downlink and uplink until SystemInformationBlockType2 is received.
Option 2: Use default bandwidth values for both downlink and uplink until SystemInformationBlockType2 is received.
Option 3: Only apply the received dl-Bandwidth to the downlink; uplink bandwidth remains unchanged until further notice.
Option 4: Ignore the dl-Bandwidth value in the message and wait for SystemInformationBlockType2 for both configurations.
Explanation: When a UE receives a MasterInformationBlock and is either in RRC_IDLE or in RRC_CONNECTED with T311 running, lacking valid system information, it applies the received downlink bandwidth (dl-Bandwidth) to the uplink as well, until receiving SystemInformationBlockType2, ensuring temporary alignment of bandwidth configurations for proper operation.