| 摘要 |
A group communication gateway is provided between a direct-mode network and a packet based group communication service in a cellular network. The communication gateway communicates with the packet based group communication service over a cellular air interface and with direct-mode terminals over a direct-mode air interface for interchanging group packet control signalling and group packet speech and/or data traffic, thereby enabling the direct-mode user terminals to participate in a packet based cellular group communication. The group communication gateway relays group attachments/detachments, handles group speech item reservations, and forwards group packet speech and data traffic between the direct mode network and the packet based group service in the cellular network.
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