Apparatus and method for controlling the operational state of an echo canceller

Abstract

An apparatus for processing wireless telecommunications is provided. The apparatus includes an echo canceller module. An echo canceller module controller is connected to the echo canceller module. The echo canceller module controller can receive echo canceller data, and can turn the echo canceller module on when the echo canceller data indicates that echo cancellation is required, such that echo cancellation may be controllably turned on only when it is needed.

What is claimed is: 
     
       1. An apparatus for echo cancellation comprising: an echo canceller module; and   a controller coupled to the echo canceller module to change the operational state of the echo canceller module, the controller being configured to not enable the echo canceller module with respect to a given call when signaling data associated with the call indicates that the call is transmitted through a hybrid.   
     
     
       2. The system of claim 1 further comprising a call processing system coupled to the echo canceller module controller, wherein the call processing system is operable to receive the signaling data and to analyze the signaling data to assess whether the call associated with the signaling data is directed to a radio based subscriber unit. 
     
     
       3. The system of claim 1 further comprising: a call processing system;   an in-band signaling agent coupled to the call processing system and the echo canceller module controller; and   wherein the call processing system is operable to receive signaling data that includes the call party data and to transfer the call party data to the in-band signaling agent.   
     
     
       4. The system of claim 3 wherein the in-band signaling agent is an R2 signaling agent. 
     
     
       5. The system of claim 1 further comprising: a call processing system;   an out-of-band signaling agent coupled to the call processing system and the echo canceller module controller; and   wherein the call processing system is operable to receive signaling data that includes the call party data and to transfer the call party data to the out-of-band signaling agent.   
     
     
       6. The system of claim 5 wherein the out-of-band signaling agent is an integrated services digital network user part agent. 
     
     
       7. The system of claim 1 further comprising: a call processing system;   an in-band signaling agent coupled to the call processing system;   an out-of-band signaling agent coupled to the call processing system;   an agent interworking system coupled to the in-band signaling agent, the out-of-band signaling agent, and the echo canceller module controller; and   wherein the call processing system is operable to receive signaling data that includes the call party data and to transfer the call party data to the echo canceller module controller using the in-band signaling agent, the out-of-band signaling agent, and the agent interworking system.   
     
     
       8. A method for processing telecommunications comprising: receiving an incoming telecommunications channel at a telecommunications switch;   receiving signaling data at the telecommunications switch;   determining whether the incoming telecommunications channel requires echo cancellation from the ignaling data; and   turning an echo canceller module on if the incoming telecommunications channel requires echo cancellation.   
     
     
       9. The method of claim 8 wherein determining whether the incoming telecommunications channel requires echo cancellation comprises determining whether the incoming telecommunications channel originated from a land-based terminal or from a mobile terminal. 
     
     
       10. The method of claim 8 wherein receiving signaling data at the telecommunications switch comprises: receiving an incoming telecommunications channel of in-band signaling data; and   extracting call origination data from the in-band signaling data.   
     
     
       11. The method of claim 10 wherein the in-band signaling data is R2 signaling data. 
     
     
       12. The method of claim 8 wherein receiving signaling data at the telecommunications switch comprises: out-of-band signaling data; and   extracting call origination data from the out-of-band signaling data.   
     
     
       13. The method of claim 12 wherein the out-of-band signaling data is integrated services digital network user part data. 
     
     
       14. The method of claim 9 wherein determining whether the incoming telecommunications channel originated from a land-based terminal or from a mobile terminal comprises comparing extracted in-band signaling data from the incoming telecommunications channel to a predetermined value that correlates to a land-based terminal. 
     
     
       15. The method of claim 9 wherein determining whether the incoming telecommunications channel originated from a land-based terminal or from a mobile terminal comprises comparing extracted R2 signaling data from the incoming telecommunications channel to a predetermined value that correlates to a land-based terminal. 
     
     
       16. The method of claim 9 wherein determining whether the incoming telecommunications channel originated from a land-based terminal or from a mobile terminal comprises comparing extracted integrated services user part signaling data from the incoming telecommunications channel to a predetermined value that correlates to a land-based terminal. 
     
     
       17. A method for controlling echo cancellation comprising: intiating an outgoing telecommunications channel at a telecommunications switch;   determining whether the destination of the outgoing telecommunications channel is a land-based terminal; and   turning on an echo canceller module if the destination of the outgoing telecommunications channel is a land-based terminal.   
     
     
       18. The method of claim 17 wherein initiating an outgoing telecommunications channel at a telecommunications switch comprises: collecting signaling data from a subscriber unit;   determining that the signaling data is signaling data for an outgoing telecommunications channel; and   transmitting the signaling data to a call processor system.   
     
     
       19. The method of claim 17 wherein determining whether the destination of the outgoing call is a land-based terminal or a mobile terminal comprises: encoding the signaling data into an in-band signaling data format;   transmitting the signaling data over an in-band signaling data channel;   receiving response data from the in-band signaling data channel; and   comparing extracted in-band signaling data from the response data to a predetermined value that correlates to a land-based terminal.   
     
     
       20. The method of claim 17 wherein determining whether the destination of the outgoing call is a land-based terminal or a mobile terminal comprises: encoding the signaling data into an in-band signaling data format;   transmitting the signaling data over an in-band signaling data channel;   receiving response data from the in-band signaling data channel; and   comparing extracted R2 signaling data from the response data to a predetermined value that correlates to a land-based terminal.   
     
     
       21. The method of claim 17 wherein determining whether the destination of the outgoing call is a land-based terminal or a mobile terminal comprises: encoding the signaling data into an out-of-band signaling data format;   transmitting the signaling data over an out-of-band signaling data channel;   receiving response data from the out-of-band signaling data channel; and   comparing extracted out-of-band signaling data from the response data to a predetermined value that correlates to a land-based terminal.   
     
     
       22. A method for processing roaming telecommunications channels comprising: receiving roam data for a telecommunications channel at a telecommunications switch;   transferring echo cancellation processing for the telecommunications channel to an anchor echo cancellation module; and   performing echo cancellation processing for the telecommunications channel with the anchor echo cancellation unit until a state of call completion is reached.   
     
     
       23. The method of claim 22 wherein receiving roam data for a telecommunications channel at a telecommunications switch comprises: establishing a telecommunications channel to a mobile subscriber unit with a telecommunications switch;   assigning the telecommunications channel to an echo cancellation module for echo cancellation processing; and   receiving signaling data at the telecommunications switch that indicates that the mobile subscriber unit is moving from a first service cell to a second service cell.   
     
     
       24. The method of claim 22 wherein transferring echo cancellation processing for the telecommunications channel to an anchor echo cancellation module comprises transferring echo cancellation processing to a bank of anchor echo cancellation modules. 
     
     
       25. The method of claim 22 wherein transferring echo cancellation processing for the telecommunications channel to an anchor echo cancellation module comprises changing the status of an echo cancellation module that is performing echo cancellation processing for the telecommunications channel to anchor echo cancellation module status.