Patent US6332006B1 successfully refreshed from Google Patents.
US6332006B1
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Apparatus and methods for providing high-penetration messaging in wireless communications systems
Assignee: Ericsson Inc
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Filing: 1998-11-18
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Granted: 2001-12-18
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Expires: 2018-11-18
Abstract
Abstract A message, e.g., a control message, a short message, a voice message or a data message, is transmitted on at least one of a first communications channel having a first redundancy level or a second communications channel having a second, higher redundancy level. A radio communications signal is received on one of the first communications channel and the second communications channel. The received radio communications signal is demodulated to recover the message using a first demodulation scheme if the radio communications signal is received on the first communications channel and using a second demodulation scheme if the radio communications signal is received on the second communications channel. According to an aspect of the invention, the received radio communications signal is coherently demodulated if the radio communications signal is received over the first communications channel and non-coherently demodulated if the radio communications signal is received over the second communications channel. According to another aspect, the message is transmitted on the first communications channel using a first modulation constellation, and transmitted on the second communications channel using a second modulation constellation representing a subset of the first modulation constellation. In other embodiments of the present invention, a first radio communications signal is transmitted representing the message encoded according to one of a first code or a second code that represents a concatenation of the first code and an additional code, such as an orthogonal code or a quasi orthogonal code. Related systems and apparatus are also described.
Inventors
- 👤 Nils Rydbeck
- 👤 Barbara Molnar
- 👤 Jiann-Ching Guey
- 👤 Ali Khayrallah
- 👤 R. David Koilpillai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:03
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/007; H04L1/02; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2053; H04L27/206; H04L27/2067; H04L27/2071
Claims Analysis
Total Claims: 75
Claim 1
Independent Claim
172 words
In a wireless communications system including at least one base station operative to serve a plurality of subscriber units, a method of communicating comprising the steps of: transmitting a message on at least one of a first communications channel having a first redundancy level or a second communications channel having a second redundancy level greater than the first redundancy level; and receiving a radio communications signal on one of the first communications channel and the second communications channel; and demodulating the received radio communications signal to recover the message using a first demodulation scheme if the radio communications signal is received on the first communications channel and using a second demodulation scheme if the radio communications signal is received on the second communications channel, wherein said step of demodulating comprises the step of coherently demodulating the received radio communications signal if the radio communications signal is received over the first communications channel and non-coherently demodulating the received radio communications signal if the radio communications signal is received over the second communications channel.
Claim 2
Dependent Claim
172 words
In a wireless communications system including at least one base station operative to serve a plurality of subscriber units, a method of communicating comprising the steps of: transmitting a message on at least one of a first communications channel having a first redundancy level or a second communications channel having a second redundancy level greater than the first redundancy level; and receiving a radio communications signal on one of the first communications channel and the second communications channel; and demodulating the received radio communications signal to recover the message using a first demodulation scheme if the radio communications signal is received on the first communications channel and using a second demodulation scheme if the radio communications signal is received on the second communications channel, wherein said step of demodulating comprises the step of coherently demodulating the received radio communications signal if the radio communications signal is received over the first communications channel and non-coherently demodulating the received radio communications signal if the radio communications signal is received over the second communications channel.
Claim 3
Dependent Claim
47 words
A method according to claim 1 , wherein said step of transmitting comprises the steps of: transmitting on the first communications channel using a first modulation constellation; and transmitting on the second communications channel using a second modulation constellation representing a subset of the first modulation constellation.
Claim 4
Dependent Claim
15 words
A method according to claim 2 , wherein the second modulation constellation provides binary modulation.
Claim 5
Dependent Claim
55 words
A method according to claim 1 , wherein said step of transmitting comprises the step of transmitting a first radio communications signal representing the message encoded according to one of a first code that is operative to produce the first redundancy level or a second code that is operative to produce the second redundancy level.
Claim 6
Dependent Claim
22 words
A method according to claim 4 , wherein the second code represents a concatenation of the first code and an additional code.
Claim 7
Dependent Claim
34 words
A method according to claim 5 , wherein the additional code comprises a code operative to produce an increased signal to noise ratio sufficient to realize a predetermined coding gain from the first code.
Claim 8
Dependent Claim
21 words
A method according to claim 5 , wherein the additional code comprises one of an orthogonal code and a quasi-orthogonal code.
Claim 9
Dependent Claim
21 words
A method according to claim 7 , wherein the second code comprises one of a Walsh-Hadamard code and a Nordstrom-Robinson code.
Claim 10
Dependent Claim
68 words
A method according to claim 4 : wherein said step of transmitting is preceded by the steps of: formatting the message into a Data Link Layer frame that conforms to a Data Link Layer protocol; encoding the first Data Link Layer frame according to one of the first code or the second code to generate an encoded message; and generating a radio communications signal from the encoded message.
Claim 11
Dependent Claim
54 words
A method according to claim 1 , comprising the steps of: transmitting the message on the first communications channel using a first amount of spectral resource; and transmitting the message on the second communications channel using a second amount of spectral resource that is substantially the same as the first amount of spectral resource.
Claim 12
Dependent Claim
48 words
A method according to claim 1 , comprising the steps of: transmitting the message on the first communications channel at a first transmission rate; and transmitting the message on the second communications channel at a second transmission rate that is substantially the same as the first transmission rate.
Claim 13
Dependent Claim
44 words
A method according to claim 1 , comprising the steps of: transmitting over the first communications channel at a first power level; and transmitting over the second communications channel at a second power level that is substantially the same as the first power level.
Claim 14
Dependent Claim
65 words
A method according to claim 1 , comprising the steps of: transmitting the message on the first communications channel at a first power level and a first transmission rate; and transmitting the message on the second channel using at a second power level substantially the same as the first power lever and at a second transmission rate substantially the same as the first transmission rate.
Claim 15
Dependent Claim
33 words
A method according to claim 1 , wherein said step of transmitting comprises the step of transmitting the message on the second communications channel when communications on the first communications channel are degraded.
Claim 16
Dependent Claim
30 words
A method according to claim 1 , wherein said step of transmitting comprises the step of concurrently transmitting the message on the first communications channel and the second communications channel.
Claim 17
Dependent Claim
36 words
A method according to claim 1 : wherein said step of transmitting comprises the step of transmitting from a base station; and wherein said step of receiving comprises the step of receiving at a subscriber unit.
Claim 18
Dependent Claim
36 words
A method according to claim 1 : wherein said step of transmitting comprises the step of transmitting from a subscriber unit; and wherein said step of receiving comprises the step of receiving at a base station.
Claim 19
Dependent Claim
28 words
A method according to claim 1 , wherein the message comprises at least one of a control message, a short message, a voice message and a data message.
Claim 20
Dependent Claim
156 words
A wireless communications system, comprising: means for transmitting a message on at least one of a first communications channel having a first redundancy level or a second communications channel having a second redundancy level greater than the first redundancy level; means for receiving a radio communications signal on one of the first communications channel and the second communications channel; and means for demodulating the received radio communications signal to recover the message using a first demodulation scheme if the radio communications signal is received on the first communications channel and using a second demodulation scheme if the radio communications signal is received on the second communications channel, wherein said means for demodulating comprises means for coherently demodulating the received radio communications signal if the radio communications signal is received over the first communications channel and means for non-coherently demodulating the received radio communications signal if the radio communications signal is received over the second communications channel.
Claim 21
Dependent Claim
156 words
A wireless communications system, comprising: means for transmitting a message on at least one of a first communications channel having a first redundancy level or a second communications channel having a second redundancy level greater than the first redundancy level; means for receiving a radio communications signal on one of the first communications channel and the second communications channel; and means for demodulating the received radio communications signal to recover the message using a first demodulation scheme if the radio communications signal is received on the first communications channel and using a second demodulation scheme if the radio communications signal is received on the second communications channel, wherein said means for demodulating comprises means for coherently demodulating the received radio communications signal if the radio communications signal is received over the first communications channel and means for non-coherently demodulating the received radio communications signal if the radio communications signal is received over the second communications channel.
Claim 22
Dependent Claim
48 words
A system according to claim 19 , wherein said means for transmitting comprises: means for transmitting on the first communications channel using a first modulation constellation; and means for transmitting on the second communications channel using a second modulation constellation representing a subset of the first modulation constellation.
Claim 23
Dependent Claim
15 words
A system according to claim 20 , wherein the second modulation constellation provides binary modulation.
Claim 24
Dependent Claim
54 words
A system according to claim 19 , wherein said means for transmitting comprises means for transmitting a first radio communications signal representing the message encoded according to one of a first code that is operative to produce the first redundancy level or a second code that is operative to produce the second redundancy level.
Claim 25
Dependent Claim
22 words
A system according to claim 22 , wherein the second code represents a concatenation of the first code and an additional code.
Claim 26
Dependent Claim
34 words
A system according to claim 23 , wherein the additional code comprises a code operative to produce an increased signal to noise ratio sufficient to realize a predetermined coding gain from the first code.
Claim 27
Dependent Claim
21 words
A system according to claim 23 , wherein the additional code comprises one of an orthogonal code and a quasi-orthogonal code.
Claim 28
Dependent Claim
21 words
A system according to claim 25 , wherein the second code comprises one of a Walsh-Hadamard code and a Nordstrom-Robinson code.
Claim 29
Dependent Claim
64 words
A system according to claim 20 , comprising: means for formatting the message into a Data Link Layer frame that conforms to a Data Link Layer protocol; means for encoding the first Data Link Layer frame according to one of the first code or the second code to generate an encoded message; and means for generating a radio communications signal from the encoded message.
Claim 30
Dependent Claim
60 words
A system according to claim 19 , wherein said means for transmitting comprises: means for transmitting the message on the first communications channel using a first amount of spectral resource; and means for transmitting the message on the second communications channel using a second amount of spectral resource that is substantially the same as the first amount of spectral resource.
Claim 31
Dependent Claim
54 words
A system according to claim 19 , wherein said means for transmitting comprises: means for transmitting the message on the first communications channel at a first transmission rate; and means for transmitting the message on the second communications channel at a second transmission rate that is substantially the same as the first transmission rate.
Claim 32
Dependent Claim
50 words
A system according to claim 19 , wherein said means for transmitting comprises: means for transmitting over the first communications channel at a first power level; and means for transmitting over the second communications channel at a second power level that is substantially the same as the first power level.
Claim 33
Dependent Claim
71 words
A system according to claim 19 , wherein said means for transmitting comprises: means for transmitting the message on the first communications channel at a first power level and a first transmission rate; and means for transmitting the message on the second channel using at a second power level substantially the same as the first power lever and at a second transmission rate substantially the same as the first transmission rate.
Claim 34
Dependent Claim
27 words
A system according to claim 19 , comprising means for transmitting the message over the second communications channel when communications over the first communications channel are degraded.
Claim 35
Dependent Claim
29 words
A system according to claim 19 , wherein said means for transmitting comprises means for concurrently transmitting the message on the first communications channel and the second communications channel.
Claim 36
Dependent Claim
30 words
A system according to claim 19 : wherein said means for transmitting are positioned at a base station; and wherein said means for receiving is positioned at a subscriber unit.
Claim 37
Dependent Claim
30 words
A system according to claim 19 : wherein said means for transmitting are positioned at a subscriber unit; and wherein said means for receiving is positioned at a base station.
Claim 38
Dependent Claim
28 words
A system according to claim 19 , wherein the message comprises at least one of a control message, a short message, a voice message and a data message.
Claim 39
Dependent Claim
89 words
In a wireless communications unit, an apparatus comprising: normal message transmitting means for transmitting a message on a first communications channel at a first redundancy level using a first modulation; and high-penetration message transmitting means for transmitting the message on a second communications channel at a second redundancy level greater than the first redundancy level using a second modulation that is different from the first modulation, wherein the first modulation comprises a modulation suitable for coherent demodulation and wherein the second modulation comprises a modulation suitable for non-coherent modulation.
Claim 40
Dependent Claim
89 words
In a wireless communications unit, an apparatus comprising: normal message transmitting means for transmitting a message on a first communications channel at a first redundancy level using a first modulation; and high-penetration message transmitting means for transmitting the message on a second communications channel at a second redundancy level greater than the first redundancy level using a second modulation that is different from the first modulation, wherein the first modulation comprises a modulation suitable for coherent demodulation and wherein the second modulation comprises a modulation suitable for non-coherent modulation.
Claim 41
Dependent Claim
56 words
An apparatus according to claim 37 : wherein said normal message transmitting means comprises means for transmitting on the first communications channel using a first modulation constellation; and wherein said high-penetration message transmitting means comprises means for transmitting on the second communications channel using a second modulation constellation representing a subset of the first modulation constellation.
Claim 42
Dependent Claim
15 words
An apparatus according to claim 38 , wherein the second modulation constellation provides binary modulation.
Claim 43
Dependent Claim
72 words
An apparatus according to claim 37 : wherein said normal message transmitting means comprises means for transmitting a radio communications signal representing the message encoded according to a first code that is operative to produce the first redundancy level; and wherein said high-penetration message transmitting means comprises means for transmitting a radio communications signal representing the message encoded according to a second code that is operative to produce the second redundancy level.
Claim 44
Dependent Claim
22 words
An apparatus according to claim 40 , wherein the second code represents a concatenation of the first code and an additional code.
Claim 45
Dependent Claim
34 words
An apparatus according to claim 41 , wherein the additional code comprises a code operative to produce an increased signal to noise ratio sufficient to realize a predetermined coding gain from the first code.
Claim 46
Dependent Claim
21 words
An apparatus according to claim 42 , wherein the additional code comprises one of an orthogonal code and a quasi-orthogonal code.
Claim 47
Dependent Claim
21 words
An apparatus according to claim 43 , wherein the additional code comprises one of a Walsh-Hadamard code and a Nordstrom-Robinson code.
Claim 48
Dependent Claim
64 words
An apparatus according to claim 40 , comprising: means for formatting the message into a Data Link Layer frame that conforms to a Data Link Layer protocol; means for encoding the first Data Link Layer frame according to one of the first code or the second code to generate an encoded message; and means for generating a radio communications signal from the encoded message.
Claim 49
Dependent Claim
24 words
An apparatus according to claim 37 , comprising means for concurrently transmitting the message on the first communications channel and the second communications channel.
Claim 50
Dependent Claim
22 words
An apparatus according to claim 37 , wherein the wireless communications unit comprises one of a base station or a subscriber unit.
Claim 51
Dependent Claim
31 words
An apparatus according to claim 37 , wherein the message comprises at least one of a control message, a short message, an acknowledgement message, a voice message and a data message.
Claim 52
Dependent Claim
139 words
In a wireless communications unit, an apparatus comprising: radio communications signal receiving means for receiving a radio communications signal on one of a first communications channel and a second communications channel; and means, responsive to said radio communications signal receiving means, for demodulating the received radio communications signal to recover a message, wherein the demodulation occurs according to one of a first demodulation scheme or a second demodulation scheme that is selected based on whether the radio communications signal is received on the first communications channel or the second communications channel, wherein said means for demodulating comprises means for coherently demodulating the received radio communications signal if the radio communications signal is received over the first communications channel and for non-coherently demodulating the received radio communications signal if the radio communications signal is received over the second communications channel.
Claim 53
Dependent Claim
139 words
In a wireless communications unit, an apparatus comprising: radio communications signal receiving means for receiving a radio communications signal on one of a first communications channel and a second communications channel; and means, responsive to said radio communications signal receiving means, for demodulating the received radio communications signal to recover a message, wherein the demodulation occurs according to one of a first demodulation scheme or a second demodulation scheme that is selected based on whether the radio communications signal is received on the first communications channel or the second communications channel, wherein said means for demodulating comprises means for coherently demodulating the received radio communications signal if the radio communications signal is received over the first communications channel and for non-coherently demodulating the received radio communications signal if the radio communications signal is received over the second communications channel.
Claim 54
Dependent Claim
77 words
An apparatus according to claim 49 : wherein said means for coherently demodulating comprises means for demodulating a received radio communications signal that is encoded according to first code that is operative to produce a first redundancy level; and wherein said means for non-coherently demodulating comprises means for demodulating a received radio communications signal that is encoded according to a second code that is operative to produce a second redundancy level greater than the first redundancy level.
Claim 55
Dependent Claim
21 words
An apparatus according to claim 50 , wherein the second code represents a concatenation of the first code and additional code.
Claim 56
Dependent Claim
21 words
An apparatus according to claim 51 , wherein the additional code comprises one of an orthogonal code and a quasi-orthogonal code.
Claim 57
Dependent Claim
21 words
An apparatus according to claim 52 , wherein the additional code comprises one of a Walsh-Hadamard code and a Nordstrom-Robinson code.
Claim 58
Independent Claim
96 words
A method of communicating in a wireless communication system, the method comprising: transmitting respective messages on first and second communications channels at respective different first and second redundancy levels using a common modulator, wherein the common modulator modulates the message transmitted on the first communications channel according to a first modulation constellation, and wherein the message transmitted on the second communications channel is encoded such that the common modulator is constrained to modulate the message transmitted on the second communications channel according to a second modulation constellation that is a subset of the first modulation constellation.
Claim 59
Independent Claim
96 words
A method of communicating in a wireless communication system, the method comprising: transmitting respective messages on first and second communications channels at respective different first and second redundancy levels using a common modulator, wherein the common modulator modulates the message transmitted on the first communications channel according to a first modulation constellation, and wherein the message transmitted on the second communications channel is encoded such that the common modulator is constrained to modulate the message transmitted on the second communications channel according to a second modulation constellation that is a subset of the first modulation constellation.
Claim 60
Dependent Claim
21 words
A method according to claim 54 , wherein the first and second communications channels comprise respective first and second control channels.
Claim 61
Dependent Claim
59 words
A method according to claim 54 , wherein the first modulation constellation is operative to produce a signal that is amenable to coherent demodulation to recover the message transmitted on the first communications channel and wherein the second modulation constellation produces a signal that is amenable to noncoherent demodulation to recover the message transmitted on the second communications channel.
Claim 62
Dependent Claim
60 words
A method according to claim 54 , wherein the first communications channel employs a first code that is operative to produce the first redundancy level and wherein the second communications channel employs a second code that is operative to produce the second redundancy level, and wherein the second code represents a concatenation of the first code and an additional code.
Claim 63
Dependent Claim
21 words
A method according to claim 57 , wherein the additional code comprises one of an orthogonal code and a quasi-orthogonal code.
Claim 64
Dependent Claim
21 words
A method according to claim 58 , wherein the second code comprises one of a Walsh-Hadamard code and a Nordstrom-Robinson code.
Claim 65
Dependent Claim
30 words
A method according to claim 54 , further comprising formatting messages to be transmitted on the first and second communications channels according to a common Data Link Layer frame format.
Claim 66
Dependent Claim
81 words
A method according to claim 54 , further comprising: receiving a radio communications signal representing one of the transmitted messages on one of the first communications channel and the second communications channel; selecting one of a first demodulation scheme or a second demodulation scheme based on whether the radio communications signal is received on the first communications channel or the second communications channel; and demodulating the received radio communications signal according to the selected demodulation scheme to recover the one message.
Claim 67
Dependent Claim
28 words
A method according to claim 61 , wherein the first demodulation scheme comprises a coherent demodulation scheme and wherein the second demodulation scheme comprises a noncoherent demodulation scheme.
Claim 68
Dependent Claim
120 words
A wireless communications apparatus, comprising: normal message transmitting means for transmitting messages on a first communications channel at a first redundancy level, the normal message transmitting means comprising a modulating means for modulating messages to be transmitted on the first communications channel according to a first modulation constellation; and high-penetration message transmitting means for transmitting a message on a second communications channel at a second redundancy level, the high-penetration message transmitting means including the modulating means and means for encoding the message transmitted on the second communications channel such that the modulating means is constrained to modulate the message transmitted on the second communications channel according to a second modulation constellation that is a subset of the first modulation constellation.
Claim 69
Dependent Claim
120 words
A wireless communications apparatus, comprising: normal message transmitting means for transmitting messages on a first communications channel at a first redundancy level, the normal message transmitting means comprising a modulating means for modulating messages to be transmitted on the first communications channel according to a first modulation constellation; and high-penetration message transmitting means for transmitting a message on a second communications channel at a second redundancy level, the high-penetration message transmitting means including the modulating means and means for encoding the message transmitted on the second communications channel such that the modulating means is constrained to modulate the message transmitted on the second communications channel according to a second modulation constellation that is a subset of the first modulation constellation.
Claim 70
Dependent Claim
21 words
An apparatus according to claim 63 , wherein the first and second communications channels comprise respective first and second control channels.
Claim 71
Dependent Claim
59 words
An apparatus according to claim 63 , wherein the first modulation constellation is operative to produce a signal that is amenable to coherent demodulation to recover the message transmitted on the first communications channel and wherein the second modulation constellation produces a signal that is amenable to noncoherent demodulation to recover the message transmitted on the second communications channel.
Claim 72
Dependent Claim
75 words
An apparatus according to claim 63 : wherein said normal message transmitting means comprises means for transmitting messages encoded according to a first code that is operative to produce the first redundancy level; and wherein said high-penetration message transmitting means comprises means for transmitting messages encoded according to a second code that is operative to produce the second redundancy level, wherein the second code represents a concatenation of the first code and an additional code.
Claim 73
Dependent Claim
21 words
An apparatus according to claim 66 , wherein the additional code comprises one of an orthogonal code and a quasi-orthogonal code.
Claim 74
Dependent Claim
21 words
An apparatus according to claim 67 , wherein the additional code comprises one of a Walsh-Hadamard code and a Nordstrom-Robinson code.
Claim 75
Dependent Claim
30 words
An apparatus according to claim 63 , comprising means for formatting messages to be transmitted on the first and second communications channels according to a common Data Link Layer format.
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