Method and apparatus for synchronizing mobile station media flows during a collaborative session

A method comprising:

• exchanging, by a wireless transmit/receive unit (WTRU), information elements for an inter-device collaborative multi-media session including a group identity, wherein the group identity indicates flows of the inter-device collaborative multi-media session that are synchronized;
• exchanging, by the WTRU, synchronization information including the group identity and an updated time synchronization information for use in synchronizing the flows, wherein the updated time synchronization information includes a presentation time offset of at least one other device sharing the group identity associated with the inter-device collaborative multi-media session;
• and
• re-synchronizing, by the WTRU, its media flow based on the updated time synchronization information, wherein the re-synchronizing updates synchronization of the flows to provide synchronized playback for the WTRU and devices associated with the inter-device collaborative multi-media session.

A network device comprising:

• a transceiver operatively coupled to a processor, the processor and the transceiver configured to exchange information elements for an inter-device collaborative multi-media session including a group identity with a wireless transmit/receive unit (WTRU), wherein the group identity indicates flows of the inter-device collaborative multi-media session that are synchronized;
• and
• the processor and transceiver is further configured to exchange synchronization information including the group identity and an updated time synchronization information for use in synchronizing the flows, wherein the updated time synchronization information includes a presentation time offset of at least one device sharing the group identity associated with the inter-device collaborative multi-media session,
• wherein the at least one device re-synchronizes its media flow based on the updated time synchronization information, wherein the re-synchronizing updates synchronization of the flows to provide synchronized playback for the devices associated with the inter-device collaborative multi-media session.