Patent US5689568A successfully refreshed from Google Patents.
US5689568A
Expired / Lapsed
US
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Medium access control for a mobile satellite system
Assignee: The AT&T MVPD Group LLC
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Filing: 1995-06-29
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Granted: 1997-11-18
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Expires: 2015-06-29
Abstract
Abstract The present invention provides a medium access control (MAC) layer in a mobile satellite system. The MAC transfers data across the physical channels in the air interface between the mobile terminals, the satellite and the gateways. The MAC of the present invention optimizes for satellite propogation delays and hides the physical transmission media from higher network layers.
Inventors
- 👤 Enrique Laborde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:19
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1853; H04B7/18532
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
A method of transferring communication data across an air interface between a satellite and a ground terminal, comprising the steps of: segmenting said communication data into uniform partitions; protecting said communication data against corruption; encrypting said communication data for confidentiality; interleaving said communication data to randomize errors; and multiplexing said communication data with control data into a number of superframes, each of which includes a plurality of frames having a multiplicity of time slots, wherein the control data is located within a particular one of the time slots of each frame and the communication data is located in a different one of the time slots of each frame.
Claim 2
Independent Claim
108 words
A method of transferring communication data across an air interface between a satellite and a ground terminal, comprising the steps of: segmenting said communication data into uniform partitions; protecting said communication data against corruption; encrypting said communication data for confidentiality; interleaving said communication data to randomize errors; and multiplexing said communication data with control data into a number of superframes, each of which includes a plurality of frames having a multiplicity of time slots, wherein the control data is located within a particular one of the time slots of each frame and the communication data is located in a different one of the time slots of each frame.
Claim 3
Dependent Claim
15 words
The method of claim 1 where the communication data is segmented into 96 bit partitions.
Claim 4
Dependent Claim
19 words
The method of claim 1 where the communication data is protected with forward error correction using a Golay code.
Claim 5
Dependent Claim
14 words
The method of claim 1 where the communication data is protected with CRC checksum.
Claim 6
Dependent Claim
17 words
The method of claim 1 where the communication data is encoded using a bit-by-bit module-2 addition (XOR).
Claim 7
Dependent Claim
17 words
The method of claim 1 where the communication data is interleaved into a 12 by 16 matrix.
Claim 8
Dependent Claim
17 words
The method of claim 1 where the multiplexing of communication data is onto a RF transmission media.
Claim 9
Dependent Claim
42 words
The method of claim 1, wherein the control data includes multiple types of control information and wherein each of the multiple types of control information is located in the particular one of the time slots of a different frame within each superframe.
Claim 10
Dependent Claim
16 words
The method of claim 8, wherein a first type of control information is frequency correction data.
Claim 11
Dependent Claim
16 words
The method of claim 8, wherein a first type of control information is network information data.
Claim 12
Dependent Claim
15 words
The method of claim 8, wherein a first type of control information is paging data.
Claim 13
Dependent Claim
27 words
The method of claim 8, wherein one of the multiple types of control information is mobile-to-mobile control data related to sending communication data between two mobile units.
Claim 14
Dependent Claim
13 words
The method of claim 1, wherein the ground terminal is a portable terminal.
Claim 15
Dependent Claim
12 words
The method of claim 1, wherein the communication data is telephony data.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-17 | 2001-05-19 | 2001-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-17 | 2005-05-19 | 2005-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-17 | 2009-05-19 | 2009-11-18 | $7700.00 | Window Closed / Lapsed |