| 摘要 |
<p>A method for realizing cluster service is disclosed. The key of the method is in that: setting the function plane function of PTT server in BCMCS controller, and setting the BCMCS CS provided with subscriber plane function of PTT server as PSG. The clustered forward voice is transmitted on BCMCS channel in multi-broadcast manner, and the backward voice is transmitted on reverse service channel in single-broadcast manner. The clustered calling signaling and floor control signaling are transmitted in single-broadcast manner. PSG only receives the voice from current speaker, encrypts the voice, and transmits the encrypted voice to the listener by forward channel, therefore, only the member of the group can decipher and receive the voice. According to present invention, by combing single-broadcast service and multi-broadcast service, BCMCS can provide cluster service, therefore realizing the co-operation of cluster service and normal service. Moreover, the present do not need any modification of air protocol and A interface protocol, and can be realized by only updating the software of client and server, therefore having good compatibility and expansibility.</p> |
