Method and system for setting up header compression communication, header compression policy function entity

A communication system, comprising:

• a header compression policy function entity, a first header compression enforcement function entity and a second header compression enforcement function entity, wherein
• the header compression policy function entity is adapted to deliver a header compression indication to the first header compression enforcement function entity or the second header compression enforcement function entity if deciding to perform header compression;
• the first header compression enforcement function entity is adapted to negotiate a header compression channel parameter with the second header compression enforcement function entity after receiving the header compression indication;
• and
• the second header compression enforcement function entity is adapted to negotiate the header compression channel parameter with the first header compression enforcement function entity after receiving the header compression indication.

A header compression policy function entity, comprising:

• a decision-making unit and a delivering unit;
• the decision-making unit is adapted to decide whether to perform header compression according to QoS requirement of service flow and available resource, and trigger the delivering unit after determining that header compression is required;
• and
• the delivering unit is adapted to deliver a header compression indication to a first header compression enforcement function entity as triggered by the decision-making unit.