| 摘要 |
A first communication unit (101) transmits, to a central controller (105), a request for a group call. The central controller allocates a first inbound (I1), a second inbound (I2), and a outbound (O1) wireless communication resource for use in the group call. At the central controller, primary voice signals from the first communication unit, received via the first inbound wireless communication resource, are summed (109) with interrupt voice signals from a second communication unit (102), received via the second inbound wireless communication resource, to produce summed voice signals. The summed voice signals and a busy signal (108) are transmitted via the outbound wireless communication resource, thereby allowing the second communication unit to interrupt the group call. Additionally, the central controller can allocate a thrid inbound communication resource (I3) for use with priority interrupt voice signals which can also be summed with the primary and interrupt voice signals.
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