Telecommunication apparatus, method, and computer program controlling sporadic data transmissions

A method of controlling sporadic data transmissions for a telecommunication apparatus enabled for high-speed packet access, the apparatus being arranged to operate according to a reduced and a further reduced mode of transmission of dedicated physical control channel transmission, the method comprising:

• determining whether an omission of a sporadic data transmission will significantly degrade performance;
• and
• disabling transmission of that sporadic data transmission when it is determined that the omission will not significantly degrade performance,
• wherein the sporadic data transmissions include silence insertion descriptor frames transmitted in a silence period of a speech transmission,
• wherein the step of determining whether the omission of the sporadic data transmission will significantly degrade performance comprises:
• determining that an omission of transmission of first and second silence insertion descriptor frames of the silence period will significantly degrade performance, and
• determining that an omission of transmission of a first number of silence insertion descriptor frames of the silence period will not significantly degrade performance, and
• wherein the first number of silence insertion descriptor frames are subsequent to the first and second silence insertion descriptor frames.