Section: O.5 Handling of unknown, unforeseen, and erroneous protocol data O.5.1 General
Content: The following subclauses specifies procedures for the handling of unknown, unforeseen, and erroneous protocol data by the receiving MS. These procedures are called "error handling procedures", but in addition to providing recovery mechanisms for error situations they define a compatibility mechanism for future extensions of the protocols. Subclauses O.5.2 to O.5.5 shall be applied in order of precedence. For the definition of semantical and syntactical errors see 3GPP TS 24.007[ Mobile radio interface signalling layer 3; General Aspects ]  [20], subclause 11.4.2. Where the description of information elements in the present document contains bits defined to be "spare bits", these bits shall set to the indicated value (usually 0) by the sending side, and their value shall be ignored by the receiving side.