US5930366A
Expired / Lapsed
US
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Synchronization to a base station and code acquisition within a spread spectrum communication system
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1997-08-29
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Granted: 1999-07-27
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Expires: 2017-08-29
Abstract
Abstract Each transmission frame within a spread spectrum communications system relating to synchronization code transmission is divided into a plurality of slots. Each of the slots includes a primary (pilot) code c p and a secondary (combined) code c s/lci that includes information identifying or indicative of both a frame timing and a scrambling code for synchronization. This information concerning frame timing and scrambling code may be encoded in the combined code c s/lci itself, as well as in the modulation values of the sequences of plural combined codes within a frame. Alternatively, the information is encoded in the sequence of plural combined codes c s/lci transmitted in each frame, as well as in the modulated values of the sequences of plural combined codes within a frame. As yet another alternative, the information is encoded in the timing of the combined code c s/lci transmission within each slot of the frame relative to its associated primary code c p .
Inventors
- 👤 Karim Jamal
- 👤 Riaz Esmailzadeh
- 👤 Yi-Pin Eric Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:59
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; H04B1/70751; H04B1/70752; H04B1/70735; H04B1/7083; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70701
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
63 words
A format for a code division multiple access downlink synchronization code transmission, comprising: a repeating frame comprising a plurality of slots; a primary synchronization code c p repeated in each slot of the repeating frame; and a secondary synchronization combined code c s/lci providing information useful in a process for identifying both a frame timing and a scrambling code for the downlink transmission.
Claim 2
Dependent Claim
63 words
A format for a code division multiple access downlink synchronization code transmission, comprising: a repeating frame comprising a plurality of slots; a primary synchronization code c p repeated in each slot of the repeating frame; and a secondary synchronization combined code c s/lci providing information useful in a process for identifying both a frame timing and a scrambling code for the downlink transmission.
Claim 3
Dependent Claim
22 words
The format of claim 1 wherein the information relating to the scrambling code is conveyed by the combined code c s/lci itself.
Claim 4
Dependent Claim
36 words
The format of claim 1 wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 5
Dependent Claim
29 words
The format of claim 3 wherein modulation implemented by the modulation sequence on the plural combined codes c s/lci within the frame comprises binary phase shift keyed (BPSK) modulation.
Claim 6
Dependent Claim
29 words
The format of claim 3 wherein modulation implemented by the modulation sequence on the plural combined codes c s/lci within the frame comprises quadrature phase shift keyed (QPSK) modulation.
Claim 7
Dependent Claim
39 words
The format of claim 1 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 8
Dependent Claim
64 words
The format of claim 6 wherein the modulation sequence comprises a first portion and a second portion, and wherein a pattern of the modulation defined by the first portion of the modulation sequence provides the information relating to the frame timing, and a pattern of the modulation defined by the second portion of the modulation sequence provides the information relating to the scrambling code.
Claim 9
Dependent Claim
35 words
The format of claim 6 wherein a pattern of the modulation defined by the modulation sequence explicitly provides the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
Claim 10
Dependent Claim
25 words
The format of claim 1 wherein a part of the information relating to the scrambling code is conveyed by the combined code c s/lci itself.
Claim 11
Dependent Claim
39 words
The format of claim 9 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 12
Dependent Claim
38 words
The format of claim 10 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
Claim 13
Dependent Claim
44 words
The format of claim 1 wherein at least part of the information relating to the scrambling code is conveyed by a sequence of the combined codes c s/lci included within the frame, the sequence further implicitly providing the information relating to the frame timing.
Claim 14
Dependent Claim
36 words
The format of claim 12 wherein further information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 15
Dependent Claim
28 words
The format of claim 13 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code.
Claim 16
Dependent Claim
58 words
The format of claim 1 wherein each combined code c s/lci is offset from its associated primary code c p in a slot by a distance specified by a pattern of distances in a distance sequence, and wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing and/or scrambling code.
Claim 17
Dependent Claim
64 words
The format of claim 15 wherein the distance sequence comprises a first portion and a second portion, and wherein a pattern of the distances defined by the first portion of the distance sequence provides the information relating to the frame timing, and a pattern of the distances defined by the second portion of the distance sequence provides the information relating to the scrambling code.
Claim 18
Dependent Claim
55 words
The format of claim 15 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing, and wherein the information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 19
Dependent Claim
55 words
The format of claim 15 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying scrambling code, and wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 20
Dependent Claim
15 words
The format of claim 1 wherein the primary code c p comprises a pilot code.
Claim 21
Dependent Claim
13 words
The format of claim 1 wherein the scrambling code comprises a long code.
Claim 22
Dependent Claim
96 words
A code division multiple access communications system, comprising: a base station transmitter for generating a downlink synchronization code transmission, comprising: a repeating frame comprising a plurality of slots; a primary synchronization code c p repeated in each slot of the repeating frame; and a secondary synchronization combined code c s/lci providing information useful in a process for identifying both a frame timing and a scrambling code for the downlink transmission; and a mobile station for receiving the downlink synchronization code transmission and recovering the information useful for identifying both a frame timing and a scrambling code.
Claim 23
Dependent Claim
96 words
A code division multiple access communications system, comprising: a base station transmitter for generating a downlink synchronization code transmission, comprising: a repeating frame comprising a plurality of slots; a primary synchronization code c p repeated in each slot of the repeating frame; and a secondary synchronization combined code c s/lci providing information useful in a process for identifying both a frame timing and a scrambling code for the downlink transmission; and a mobile station for receiving the downlink synchronization code transmission and recovering the information useful for identifying both a frame timing and a scrambling code.
Claim 24
Dependent Claim
22 words
The system of claim 21 wherein the information relating to the scrambling code is conveyed by the combined code c s/lci itself.
Claim 25
Dependent Claim
36 words
The system of claim 21 wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 26
Dependent Claim
29 words
The system of claim 23 wherein modulation implemented by the modulation sequence on the plural combined codes c s/lci within the frame comprises binary phase shift keyed (BPSK) modulation.
Claim 27
Dependent Claim
29 words
The system of claim 23 wherein modulation implemented by the modulation sequence on the plural combined codes c s/lci within the frame comprises quadrature phase shift keyed (QPSK) modulation.
Claim 28
Dependent Claim
39 words
The system of claim 21 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 29
Dependent Claim
64 words
The system of claim 26 wherein the modulation sequence comprises a first portion and a second portion, and wherein a pattern of the modulation defined by the first portion of the modulation sequence provides the information relating to the frame timing, and a pattern of the modulation defined by the second portion of the modulation sequence provides the information relating to the scrambling code.
Claim 30
Dependent Claim
35 words
The system of claim 26 wherein a pattern of the modulation defined by the modulation sequence explicitly provides the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
Claim 31
Dependent Claim
25 words
The system of claim 21 wherein a part of the information relating to the scrambling code is conveyed by the combined code c s/lci itself.
Claim 32
Dependent Claim
39 words
The system of claim 29 wherein the information relating to the frame timing and scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 33
Dependent Claim
38 words
The system of claim 30 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code and implicitly provides the information relating to the frame timing.
Claim 34
Dependent Claim
44 words
The system of claim 21 wherein at least part of the information relating to the scrambling code is conveyed by a sequence of the combined codes c s/lci included within the frame, the sequence further implicitly providing the information relating to the frame timing.
Claim 35
Dependent Claim
36 words
The system of claim 32 wherein further information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 36
Dependent Claim
28 words
The system of claim 33 wherein a pattern of the modulation defined by the modulation sequence explicitly provides another part of the information relating to the scrambling code.
Claim 37
Dependent Claim
58 words
The system of claim 21 wherein each combined code c s/lci is offset from its associated primary code c p in a slot by a distance specified by a pattern of distances in a distance sequence, and wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing and/or scrambling code.
Claim 38
Dependent Claim
64 words
The system of claim 35 wherein the distance sequence comprises a first portion and a second portion, and wherein a pattern of the distances defined by the first portion of the distance sequence provides the information relating to the frame timing, and a pattern of the distances defined by the second portion of the distance sequence provides the information relating to the scrambling code.
Claim 39
Dependent Claim
55 words
The system of claim 35 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying frame timing, and wherein the information relating to the scrambling code is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 40
Dependent Claim
55 words
The system of claim 35 wherein the pattern of distances defined by the distance sequence provides the information useful in identifying scrambling code, and wherein the information relating to the frame timing is conveyed by modulation values, selected in accordance with a predetermined modulation sequence, for the plural combined codes c s/lci within the frame.
Claim 41
Dependent Claim
15 words
The system of claim 21 wherein the primary code c p comprises a pilot code.
Claim 42
Dependent Claim
13 words
The system of claim 21 wherein the scrambling code comprises a long code.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-07-26 | 2003-01-25 | 2003-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-26 | 2007-01-25 | 2007-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-26 | 2011-01-25 | 2011-07-27 | $7700.00 | Window Closed / Lapsed |