| 摘要 |
A method and apparatus for dealing with a request from a user for leaving and zapping a multicast service channel in a network access apparatus, which supports the multicast service, are provided in this invention. A new state, i.e. unused state, is introduced to implement a slow leaving mechanism. When the last user of a multicast group leaves the group, the group will be set into the unused state instead of being deleted immediately, and a period of reserve time is set for the specific group. If there is any user requesting for joining the group within the period of reserve time, the group will be set back into the active state, otherwise the group will be deleted. This mechanism avoids frequent switching requests from the network access apparatus to the network, relieves the heavy load of the network due to the users' frequent zapping requests and hence improves the network performance.
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