| 摘要 |
This invention relates to a communication system ( 200 ), user equipment ( 201,211 ) and method of performing a conference call. The communication system ( 200 ) employs discontinuous transmission and has a plurality of user equipment ( 201, 211, 213, 215 ) and a fixed network ( 205, 207, 208 ). It further comprises a speech metric processor ( 225 ) for determining if speech is originating at the user equipment. The system also comprises a silence descriptor frame generator ( 229 ) which generate silence descriptor frames if no speech is originating and a conference call processor ( 231 ) for determining if a call involving the user equipment is a conference call. Furthermore the communication system comprises means ( 229, 239 ) for suppressing silence descriptor information of the silence descriptor frames if the call is a conference call. The invention is applicable to cellular mobile radio communication systems such as UMTS.
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