| 摘要 |
Methods and apparatus are disclosed for providing program selection in a packet-based communications system. A program definition (110) is generated for each program (BS1, BS2, ...BSn) that specifies which of the elementary streams carried on a particular frequency channel comprise that program. The program definition for each program is periodically, and frequently, transmitted to each subscriber location (72, 74) on the frequency channel carrying the elementary streams of the selected program, extracts a program definition for the selected program from the tuned frequency channel, and then obtains from the frequency channel the elementary streams (V, A, CC) specified in the extracted program definition as comprising the selected program.
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