| 摘要 |
A mobile station (10) for use in radio communications with other mobile stations the mobile station being operable to establish a group call with one or more of the other mobile stations by issuing a signal indicating which other mobile stations are requested or permitted to join the group call, wherein the mobile station includes input selection means for allowing a user of the mobile station to select one or more options from one or more call set-up criteria options available to the user and which is operable to issue a call set-up request signal including a plurality of fields relating to the requested call, wherein a first one of the fields relates to a group permitted or requested to join the call, and wherein a second one of the fields relates to an option related to the requested call selectable by the user using the input selection means. Fields included in the signal may include an indication of selections by the call initiator of other groups permitted to join the call and optionally a call priority level. A method of operation of the mobile stations is also described.
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