US5805585A
Expired / Lapsed
US
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Method for providing high speed packet data services for a wireless system
Assignee: AT&T Inc
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Filing: 1996-08-22
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Granted: 1998-09-08
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Expires: 2016-08-22
Abstract
Abstract A low cost solution for providing wireless multi-rate packet data communications between a transmitting unit and a receiving unit on a single spread spectrum channel. The transmitting unit and receiving unit are operable to change communications modes at any given time to provide packet data communications at any given data rate for any given duration. In general, the transmitting unit is operable to change the coding gain of the transmitted spread spectrum to establish a communications mode providing a given data rate for communication to the receiving unit. In one embodiment, the transmitting unit first establishes a regular communications mode, wherein the transmitting unit generates a spread spectrum packet data signal having a high coding gain, thus providing low rate, highly reliable communications over the channel. Then, at any given time, the transmitting unit sends an escape sequence instructing the receiver to switch to a temporary communications mode, wherein the transmitting unit generates a signal having a lower coding gain, and thus provide a higher data rate for such user services requiring high rate communications.
Inventors
- 👤 Joel I. Javitt
- 👤 Edward Wronka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:26
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; H04B7/264; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/711; H04B1/7115; H04B7/2631; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
138 words
A wireless packet data communication system, comprising: a transmitter for spreading and transmitting said packet data at a given data rate, said transmitter operable to set a coding gain for said spread packet data transmission, wherein said coding gain determines said data rate; a receiving element for receiving and despreading said spread packet data from said transmitter unit; and a channel for providing a physical link between said transmitter unit and said receiving element to communicate said spread packet data therebetween, said channel having a predetermined coherence interval; said transmitter being operable to change and set said coding gain of said spread packet data transmission at any given time to thereby change said data rate to any given rate, and said receiving element operable to despread said spread packet data at any coding gain set by said transmitter.
Claim 2
Dependent Claim
138 words
A wireless packet data communication system, comprising: a transmitter for spreading and transmitting said packet data at a given data rate, said transmitter operable to set a coding gain for said spread packet data transmission, wherein said coding gain determines said data rate; a receiving element for receiving and despreading said spread packet data from said transmitter unit; and a channel for providing a physical link between said transmitter unit and said receiving element to communicate said spread packet data therebetween, said channel having a predetermined coherence interval; said transmitter being operable to change and set said coding gain of said spread packet data transmission at any given time to thereby change said data rate to any given rate, and said receiving element operable to despread said spread packet data at any coding gain set by said transmitter.
Claim 3
Dependent Claim
54 words
The communications system of claim 1 wherein said transmitter is operable to establish a first coding gain during a normal mode of operation and a second coding gain during a temporary mode of operation, wherein said first coding gain sets a first data rate and said second coding gain sets a second data rate.
Claim 4
Dependent Claim
18 words
The communications system of claim 2 wherein said second data rate is greater than said first data rate.
Claim 5
Dependent Claim
33 words
The communications system of claim 3 wherein said transmitter is operable to transmit said packet data during said temporary mode of operation for a period of time less than said channel coherence interval.
Claim 6
Dependent Claim
22 words
The communications system of claim 4 wherein said transmitter sets said coding gain through a coding sequence having a given chip rate.
Claim 7
Dependent Claim
60 words
The communications system of claim 2 wherein said transmitter establishes said normal mode of operation through an initialization means comprising: means for synchronizing communications between said transmitter and said receiving element to synchronize said coding sequence having said given chip rate therebetween, and means for determining a transmit power to establish a given bit error rate for said synchronized communications.
Claim 8
Dependent Claim
62 words
The communications system of claim 6 wherein said transmitter establishes said temporary mode of operation through an escape means comprising: means for transmitting an escape instruction to inform said receiving element to switch to said temporary mode of operation; and means for determining a change in said transmit power to maintain said given bit error rate during said temporary mode of operation.
Claim 9
Dependent Claim
20 words
The communications system of claim 7 further comprising means for freezing said synchronization between said transmitter and said receiving element.
Claim 10
Dependent Claim
25 words
The communications system of claim 7 further comprising means for synchronizing communications between said transmitter and said receiving element for said temporary mode of operation.
Claim 11
Dependent Claim
25 words
The communications system of claim 7 wherein said escape instruction indicates a time duration for transmitting said packet data during said temporary mode of operation.
Claim 12
Dependent Claim
35 words
The communications system of claim 10 wherein said escape means further comprises means for transmitting a return instruction for instructing said receiving element to return to said normal mode of operation at a given time.
Claim 13
Dependent Claim
26 words
The communications system of claim 2 wherein said transmitter and said receiving element enter into said temporary mode of operation for a given duration of time.
Claim 14
Dependent Claim
20 words
The communications system of claim 12 wherein said given duration of time is less than said predetermined channel coherence interval.
Claim 15
Dependent Claim
99 words
The communications system of claim 6 wherein said means for determining said transmit power comprises: means for monitoring said packet data at said receiving element to determine a measured power level, and a measured noise therefore; means for calculating from said measured power level and said measured noise, a measured signal strength having a measured signal to noise (S/N) ratio; means for monitoring said packet data at said receiving element to determine a measured bit error rate (BER) therefor; means for adjusting said transmit power level when said measured BER is outside a tolerance range of said given BER.
Claim 16
Dependent Claim
64 words
The communications system of claim 14 wherein said means for adjusting said transmit power comprises: means for calculating a measured BER when operating in said temporary mode of operation; means for determining whether said measured BER is substantially the same as said given BER; and means for adjusting said transmit power so that said measured BER is substantially the same as said given BER.
Claim 17
Dependent Claim
13 words
The communications system of claim 1 wherein said channel is a multi-path channel.
Claim 18
Dependent Claim
24 words
The communication system of claim 1 wherein said receiver has a RAKE receiver for acquiring, tracking and despreading said packet data from said transmitter.
Claim 19
Dependent Claim
22 words
The communications system of claim 1 wherein said wireless system is a spread spectrum system employing code division multiple access (CDMA) coding.
Claim 20
Independent Claim
184 words
A method for providing multi-rate packet data communications between a transmitter and a receiving element communicating over a channel on a wireless communications system, the channel having a given coherence interval, the method comprising the steps of: establishing a first communication mode wherein the transmitter generates a signal having a coding gain for transmitting said packet data to the receiving element; and transmitting an escape instruction to the receiving element at any given time to instruct said receiving element to switch to a second communication mode, the transmitter being operable to generate a signal having a given coding gain during said second communication mode; said coding gain of said first communication mode establishing a first data rate between said transmitter and said receiving element, and said given coding gain of said second communication mode establishing a second data rate between said transmitter and said receiving element; said transmitter being operable to change and set said coding gain of said first and said second communication modes at any given time to thereby change said first and said second data rate at said any given time.
Claim 21
Independent Claim
184 words
A method for providing multi-rate packet data communications between a transmitter and a receiving element communicating over a channel on a wireless communications system, the channel having a given coherence interval, the method comprising the steps of: establishing a first communication mode wherein the transmitter generates a signal having a coding gain for transmitting said packet data to the receiving element; and transmitting an escape instruction to the receiving element at any given time to instruct said receiving element to switch to a second communication mode, the transmitter being operable to generate a signal having a given coding gain during said second communication mode; said coding gain of said first communication mode establishing a first data rate between said transmitter and said receiving element, and said given coding gain of said second communication mode establishing a second data rate between said transmitter and said receiving element; said transmitter being operable to change and set said coding gain of said first and said second communication modes at any given time to thereby change said first and said second data rate at said any given time.
Claim 22
Dependent Claim
17 words
The method of claim 19 wherein said second data rate is greater than said first data rate.
Claim 23
Dependent Claim
31 words
The method of claim 20 wherein said transmitter is operable to transmit said packet data during said second communication mode for a period of time less than the channel coherence interval.
Claim 24
Dependent Claim
28 words
The method of claim 21 further comprising the step of setting said first and said second coding gain through a given coding sequence having a given chip rate.
Claim 25
Dependent Claim
55 words
The method of claim 22 wherein said step of establishing said first communications mode further comprises the steps of: synchronizing communications between said transmitter and said receiving element to synchronize said coding sequence having said given chip rate therebetween, and establishing a transmit power to maintain a given bit error rate for said synchronized communications.
Claim 26
Dependent Claim
45 words
The method of claim 23 further comprising the step of establishing said second communication mode through an escape means, said escape means comprising the step of determining a change in said transmit power to maintain said given bit error rate during said second communication mode.
Claim 27
Dependent Claim
30 words
The method of claim 24 wherein said escape means further comprises the step of freezing said synchronization established during said first communication mode between said transmitter and said receiving element.
Claim 28
Dependent Claim
30 words
The method of claim 24 wherein said escape means further comprises the step of establishing a communications synchronization between said transmitter and said receiving element during said second communication mode.
Claim 29
Dependent Claim
17 words
The method of claim 19 wherein said escape instruction indicates a time duration for said temporary mode.
Claim 30
Dependent Claim
35 words
The method of claim 19 further comprising the step of transmitting a return instruction for instructing the receiving element to switch from said first communications mode to said second communications mode at a given time.
Claim 31
Dependent Claim
24 words
The method of claim 19 wherein said transmitter and said receiving element enter into said second communications mode for a given duration of time.
Claim 32
Dependent Claim
19 words
The method of claim 29 wherein said given duration of time is less than said predetermined channel coherence interval.
Claim 33
Dependent Claim
94 words
The method of claim 23 wherein said step of establishing said transmit power further comprises the steps of: monitoring said packet data at said receiving element to determine a measured power level, and a measured noise therefore; calculating from said measured power level and said measured noise, a measured signal strength having a measured signal to noise (S/N) ratio; monitoring said packet data at said receiving element to determine a measured bit error rate (BER) therefor; adjusting said transmit power level when said measured BER is outside a tolerance range of said given BER.
Claim 34
Dependent Claim
69 words
The method of claim 24 wherein said step of determining a change in said transmit power further comprises the steps of: means for calculating a measured BER when operating in said second communications mode; means for determining whether said measured BER is substantially the same as said given BER; and means for adjusting said transmit power so that said measured BER is substantially the same as said given BER.
Claim 35
Dependent Claim
12 words
The method of claim 19 wherein said channel is a multi-path channel.
Claim 36
Dependent Claim
24 words
The method of claim 19 wherein said receiver element has a RAKE receiver for acquiring, tracking and despreading said packet data from said transmitter.
Claim 37
Dependent Claim
102 words
The method of claim 34 wherein said RAKE receiver comprises: an antenna operable to receive radio signals from said transmitting unit; a demodulator coupled to said antenna for demodulating said radio signals; a converter coupled to said demodulator for converting said demodulated radio signals to form a digital signal; a RAKE circuit coupled to said converter for despreading and tracking said radio signals; and a digital signal processing unit coupled to said RAKE circuit for controlling said RAKE circuit so that the RAKE receiver is operable to provide said acquiring, tracking and despreading of said packet data for any given data rate.
Claim 38
Dependent Claim
21 words
The method of claim 19 wherein said wireless system is a spread spectrum system employing code division multiple access (CDMA) coding.
Claim 39
Independent Claim
193 words
A method for providing high-rate packet data communications in a CDMA wireless system, comprising the steps of: establishing a digital radio communication channel between a transmitting unit and a receiving unit for communicating a data packet signal at a first data rate therebetween, wherein said receiving unit has a RAKE receiver for despreading said data packet signal, said digital radio communication channel having a given coherence interval; transmitting a pre-determined control data sequence to said receiving unit to instruct said receiving unit to receive said data packet signal at a second data rate, wherein said second data rate is greater than said first data rate; transmitting said data packet signal at said second data rate to said receiving unit to said receiving unit during a predetermined time interval, wherein said predetermined time interval is less than said given coherence interval of said digital radio communication channel; maintaining a constant power level during said transmitting of said data packet signal during the step of transmitting said data packet signal; and changing a coding gain of said digital radio communications synchronously with said transmitting unit, and extracting received data bits at said second data rate.
Claim 40
Independent Claim
193 words
A method for providing high-rate packet data communications in a CDMA wireless system, comprising the steps of: establishing a digital radio communication channel between a transmitting unit and a receiving unit for communicating a data packet signal at a first data rate therebetween, wherein said receiving unit has a RAKE receiver for despreading said data packet signal, said digital radio communication channel having a given coherence interval; transmitting a pre-determined control data sequence to said receiving unit to instruct said receiving unit to receive said data packet signal at a second data rate, wherein said second data rate is greater than said first data rate; transmitting said data packet signal at said second data rate to said receiving unit to said receiving unit during a predetermined time interval, wherein said predetermined time interval is less than said given coherence interval of said digital radio communication channel; maintaining a constant power level during said transmitting of said data packet signal during the step of transmitting said data packet signal; and changing a coding gain of said digital radio communications synchronously with said transmitting unit, and extracting received data bits at said second data rate.
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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) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |