Radio telecommunication network and method for unobtrusive call interception via transcoder bypass
First Claim
1. A method of unobtrusively intercepting a call between a subscriber unit and a second device at an intercepting network node routed through a radio link of a telecommunication network, said method comprising the steps of:
- a) receiving first compressed call data from said subscriber unit and second compressed call data from said second device;
b) converting said first and second compressed call data from a first data rate to a second data rate if said call is to be intercepted;
c) generating a compressed combined call data from said first and second compressed call data having said second data rate, if said call is to be intercepted;
d) routing said first compressed call data having said second data rate toward said second device; and
e) routing said compressed combined call data having said second data rate toward a monitoring center, if said call is to be intercepted.
3 Assignments
0 Petitions
Accused Products
Abstract
A digital cellular telecommunication network (30) uses transcoders (50) which vocode voice using a maximal lossy compression algorithm which conserves spectrum usage. A call path for an intercepted call is looped from an outer space satellite (32) network into an intercepting terrestrial gateway (34). Compressed call data for each of two half-calls in this call path bypass normal transcoders (50) through the use of rate adapters (80) which translate between data communication protocols that operate at different data rates without voice coding and decoding. After rate adaptation, the compressed call data are combined in a conference bridge (90), and routed to a monitoring center (60). A subscriber unit (36), a second device (48), and the monitoring center (60) all receive call data which has experienced only one compression/decompression cycle.
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Citations
18 Claims
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1. A method of unobtrusively intercepting a call between a subscriber unit and a second device at an intercepting network node routed through a radio link of a telecommunication network, said method comprising the steps of:
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a) receiving first compressed call data from said subscriber unit and second compressed call data from said second device; b) converting said first and second compressed call data from a first data rate to a second data rate if said call is to be intercepted; c) generating a compressed combined call data from said first and second compressed call data having said second data rate, if said call is to be intercepted; d) routing said first compressed call data having said second data rate toward said second device; and e) routing said compressed combined call data having said second data rate toward a monitoring center, if said call is to be intercepted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of unobtrusively intercepting a call between a subscriber unit and a second device, said method comprising the steps of:
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a) establishing said call between a subscriber unit and a second device; b) obtaining call data at the subscriber unit; c) compressing said call data at said subscriber unit to obtain compressed call data; d) transmitting said compressed call data to an intercepting network node; e) converting said compressed call data from a first data rate to a second data rate if said call is to be intercepted; f) routing said compressed call data having said second data rate through a conference bridge at said intercepting network node, said conference bridge generating compressed-combined call data having said second data rate; g) routing said compressed call data having said second data rate toward said second device; and h) routing said compressed-combined call data toward a monitoring center, if said call is to be intercepted. - View Dependent Claims (12, 13, 14, 15)
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16. A radio telecommunication network allowing unobtrusive interception of a call established between a subscriber unit and a second device, said network comprising:
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a plurality of network nodes in communication with one another, wherein one of said network nodes is in radio communication with said subscriber unit, one of said network nodes is in communication with said second device, and one of said network nodes is an intercepting node; wherein said intercepting node comprises; a terminal controller in communication with said network node that is in radio communication with said subscriber unit, said terminal controller being configured to receive compressed call data generated by said subscriber unit; a rate adapter being coupled to the terminal controller and being configured to convert said compressed call data from a first data rate to a second data rate if said call is to be intercepted; and a conference bridge coupled to said rate adapter being configured to generate compressed-combined call data having said second data rate, wherein said compressed-combined call data having said second data rate are routed through said rate adapter and terminal controller toward said second device and toward a monitoring center. - View Dependent Claims (17, 18)
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Specification