Radio communication system
First Claim
1. A radio communication system having a random access channel for transmissions from a secondary station to a primary station, the secondary station having means for requesting allocation of a random access channel resource by transmission of an access preamble encoded with a first signature selected from a first set of signatures and the primary station having means for receiving the access preamble, for determining the first signature and for transmitting an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available;
- means for determining at which of a plurality of available time offsets the access preamble was transmitted; and
means for receiving a contention resolution preamble, transmitted by the secondary station in response to reception of the access acknowledgement, for determining at which of the plurality of available time offsets the contention resolution preamble was transmitted, and for transmitting a contention resolution acknowledgement indicating whether the secondary station has been granted access to the requested resource, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set.
3 Assignments
0 Petitions
Accused Products
Abstract
A radio communication system has a random access channel for the transmission of data (214) from a secondary station to a primary station. Such a channel is intended for use by secondary stations having data (214) to transmit to a primary station while not actually engaged in a call.
By enabling access requests (202) to be transmitted with a greater range of possible signatures, a much greater number of degrees of freedom is available to a secondary station requesting access to a random access channel. This enables significantly improved efficiency of resource allocation by increasing the amount of information transmitted to the primary station by the access request (202).
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Citations
10 Claims
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1. A radio communication system having a random access channel for transmissions from a secondary station to a primary station, the secondary station having means for requesting allocation of a random access channel resource by transmission of an access preamble encoded with a first signature selected from a first set of signatures and the primary station having means for receiving the access preamble, for determining the first signature and for transmitting an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available;
- means for determining at which of a plurality of available time offsets the access preamble was transmitted; and
means for receiving a contention resolution preamble, transmitted by the secondary station in response to reception of the access acknowledgement, for determining at which of the plurality of available time offsets the contention resolution preamble was transmitted, and for transmitting a contention resolution acknowledgement indicating whether the secondary station has been granted access to the requested resource, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set. - View Dependent Claims (2)
- means for determining at which of a plurality of available time offsets the access preamble was transmitted; and
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3. A primary station for use in a radio communication system having a random access channel for transmissions from a secondary station to the primary station, wherein means are provided for (i) receiving an access preamble transmitted by the secondary station, which preamble is encoded with a first signature selected from a first set of signatures, for determining the first signature, for determining from the access preamble which random access channel resource the secondary station requests to be allocated and for transmitting an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available;
- ii) determining at which of a plurality of available time offsets the access preamble was transmitted; and
iii) receiving a contention resolution preamble, transmitted by the secondary station in response to reception of the access acknowledgement, for determining at which of the plurality of available time offsets the contention resolution preamble was transmitted, and for transmitting a contention resolution acknowledgement indicating whether the secondary station has been granted access to the requested resource, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set. - View Dependent Claims (4)
- ii) determining at which of a plurality of available time offsets the access preamble was transmitted; and
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5. A secondary station for use in a radio communication system having a random access channel for transmissions to a primary station, wherein means are provided for (i) requesting allocation of a random access channel resource by transmission of an access preamble encoded with a first signature selected from a first set of signatures and for receiving an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available;
- and ii) receiving an access acknowledgement from the primary station indicating successful reception of the access preamble and for transmitting in response a contention resolution preamble at one of the plurality of available time offsets,
wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set, the access preamble is transmitted at one of a plurality of available time offsets, which offset provides further information regarding the resource allocation request, and use of any one of the plurality of available time offsets results in the transmission of the preamble in advance of the time at which it would be transmitted without the offset. - View Dependent Claims (6)
- and ii) receiving an access acknowledgement from the primary station indicating successful reception of the access preamble and for transmitting in response a contention resolution preamble at one of the plurality of available time offsets,
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7. A method of operating a radio communication system having a random access channel for transmissions from a secondary station to a primary station, the method comprising:
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requesting, via the secondary station, allocation of a random access channel resource by transmission of an access preamble encoded with a first signature selected from a first set of signatures and the primary station receiving the access preamble; determining the first signature and transmitting an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available; determining at which of a plurality of available time offsets the access preamble was transmitted; receiving a contention resolution preamble, transmitted by the secondary station in response to reception of the access acknowledgement; determining at which of the plurality of available time offsets the contention resolution preamble was transmitted; and transmitting a contention resolution acknowledgement indicating whether the secondary station has been granted access to the requested resource, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set. - View Dependent Claims (8, 9, 10)
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Specification