| 摘要 |
A method to provide information in a communication access network which includes a plurality of terminals (T11, T12, T13, ..., T31, ...) and a head-end (HE). The head-end (HE) includes a plurality of transceivers (TRX1, TRX2, TRX3, ...) and is downstream coupled to each one of the plurality of terminals (T11, T12, T13, ..., T31, ...) via a downstream common link (Lc) and a tree-like distributive network. Each transceiver (TRX1) provides a downstream signal (Sd1) in a frequency band (CH1) to a combiner (COMB) which combines the different downstream signals into a downstream modulated signal (S-MOD) which is broadcasted to the different terminals. A first one (T12) of the terminals is upstream coupled to a first one (TRX1) of the transceivers via an upstream link (Lu12). The information is provided to the first terminal (T12) and concerns a filter frequency band (CH1) which must be used by the first terminal (T12) to filter out of the modulated signal (S-MOD) a regenerated downstream signal which is associated to a first one (Sd1) of the downstream signals provided by the first transceiver (TRX1). The method includes : a) distributing by the head-end (HE) initialisation packets (Tx-TRX1, Ty-TRX2, Tz-TRX3, ...) which includes a reference (Tz) and which is associated to one of the transceivers (TRX3) and which is included in one (Sd3) of the downstream signals; and b) filtering out of the downstream modulated (S-MOD) signal by the first terminal (T12) with one of the plurality of frequency bands (CH3) a regenerated downstream signal (Sdr3); and c) upstream transmitting by the first terminal (T12) a confirmation signal which includes the reference (Tz) of that one initialization packet and an identification of the first terminal (T12); and d) in the event that the transceiver (TRX3) associated to the reference (Tz) not corresponds to the first transceiver (TRX1) distributing by the head-end (HE) a change request by including the change request in the downstream signal (Sd3) provided by the transceiver (TRX3) which is associated to the reference (Tz), the change request includes the identification of the first terminal (T12) and the first frequency band (CH1) associated to the first transceiver (TRX1). <IMAGE> |
