Question: In a Transparent end-to-end Packet-switched Streaming Service (PSS) as per 3GPP specifications, how does a PSS client indicate unchanged metric values for CodecInfo, CodecProfileLevel, or CodecImageSize from the previous measurement resolution period in XML reporting?
Option 1: By omitting the value for that period
Option 2: By setting the value to "0"
Option 3: By using a special character "=" in the respective vector
Option 4: By repeating the previous value explicitly
Explanation: According to the specifications, when the metric values for CodecInfo, CodecProfileLevel, or CodecImageSize remain unchanged from one measurement resolution period to the next, the PSS client is allowed to use the "=" symbol in the vector to signify this consistency. This approach efficiently indicates stability without requiring the repetition of previous values or implying a reset (as might be inferred from setting to "0" or omitting).