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US6925561B1
Expired / Lapsed
US
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Radio communication system
Assignee: Koninklijke Philips NV
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Filing: 2000-10-12
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Granted: 2005-08-02
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Expires: 2020-10-12
Abstract
Abstract A radio communication system has a random access channel for the transmission of data from a secondary station to a primary station while the secondary station is not engaged in a call. A secondary station wishing to use a random access channel resource transmits a preamble encoded with a signature corresponding to the required resource. In response the primary station can transmit a positive acknowledgement (ACK) corresponding to the received preamble, indicating that a channel is available, or a negative acknowledgement (NACK), indicating that the resource is not available. A first set of signatures are used to encode ACKs and a second set of signatures are used to encode NACKs. The two sets of signatures have the property that no signature in one set is the inverse of a signature in the other set, thereby avoiding the possibility of simultaneously transmitting an ACK and a NACK with signatures that are the inverse of one another.
Inventors
- 👤 Bernard Hunt
- 👤 Timothy J. Moulsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:30
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04W; H04W74/00; H04W74/08; H04W74/0866; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
130 words
A radio communication system having a random access channel for the transmission of data from secondary stations to a primary station, the secondary stations having means for requesting access to random access channel resources and the primary station having means for transmitting in response at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding the signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 2
Dependent Claim
130 words
A radio communication system having a random access channel for the transmission of data from secondary stations to a primary station, the secondary stations having means for requesting access to random access channel resources and the primary station having means for transmitting in response at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding the signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 3
Dependent Claim
23 words
A system as claimed in claim 1 , characterised in that the random access channel is adapted for transmission of data in packets.
Claim 4
Dependent Claim
135 words
A primary station for use in a radio communication system having a random access channel for the transmission of data from secondary stations to the primary station, wherein means are provided for receiving requests from secondary stations for access to random access channel resources and for transmitting in response at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding the signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 5
Dependent Claim
135 words
A primary station for use in a radio communication system having a random access channel for the transmission of data from secondary stations to the primary station, wherein means are provided for receiving requests from secondary stations for access to random access channel resources and for transmitting in response at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding the signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 6
Dependent Claim
25 words
A primary station as claimed in claim 3 , characterised in that the first set of signatures comprises a plurality of signatures and their inverses.
Claim 7
Dependent Claim
28 words
A primary station as claimed in claims 3 or 4 , characterised in that the second set of signatures does not include both a signature and its inverse.
Claim 8
Dependent Claim
132 words
A secondary station for use in a radio communication system having a random access channel for the transmission of data to a primary station, wherein means are provided for requesting access to a random access channel resource and for receiving from the primary station at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding acknowledgement and rejection signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 9
Dependent Claim
132 words
A secondary station for use in a radio communication system having a random access channel for the transmission of data to a primary station, wherein means are provided for requesting access to a random access channel resource and for receiving from the primary station at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding acknowledgement and rejection signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 10
Dependent Claim
37 words
A secondary station as claimed in claim 6 , characterised in that the means for requesting access to a random access channel resource comprises means for transmitting a signal encoded with a signature corresponding to the resource.
Claim 11
Independent Claim
135 words
A method of operating a radio communication system having a random access channel for the transmission of data from secondary stations to a primary station, the method comprising at least one of the secondary stations requesting access to random access channel resources and the primary station transmitting in response at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding the signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 12
Independent Claim
135 words
A method of operating a radio communication system having a random access channel for the transmission of data from secondary stations to a primary station, the method comprising at least one of the secondary stations requesting access to random access channel resources and the primary station transmitting in response at least one of an acknowledgement signal encoded with a first signature and a rejection signal encoded with a second signature, both signals being able to be transmitted at substantially the same time, and the signatures available for encoding the signals being partitioned into first and second sets in such a way that neither set contains a signature that is the inverse of a signature in the other set, the first signature being selected from the first set and the second signature from the second set.
Claim 13
Dependent Claim
20 words
A method as claimed in claim 8 , characterised by the resource comprising any channel supporting a particular bit rate.
Claim 14
Dependent Claim
40 words
A method as claimed in claim 8 or 9 , characterised by the first set of signatures comprising a plurality of signatures and their inverses and by the second set of signatures not including both a signature and its inverse.
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) | 2008-08-01 | 2009-01-31 | 2009-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-08-01 | 2013-01-31 | 2013-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-08-01 | 2017-01-31 | 2017-08-02 | $7700.00 | Window Closed / Lapsed |