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US 8,913,563 B2Granted
Velocity based random access scheme
AssigneeEmpire Technology Development LLC
InventorJung Suk Joo
Life of this patent
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Abstract
A communications method includes establishing two or more access slot groups corresponding to velocity ranges of mobile units, receiving a signal from a mobile unit in an access slot of an access slot group, where the signal includes a sequence, and detecting the sequence using a detection algorithm, where the detection algorithm used is assigned to the access slot group.
Claims20
A communications method comprising:
- establishing an access slot group corresponding to a velocity range of one or more mobile units relative to a network element;
- establishing a slot sequence for the access slot group, wherein the slot sequence is weighted based on a frequency of use of the one or more mobile units;
- transmitting the access slot group information to one or more mobile units, wherein the access slot group information indicates a start time for an access slot and the slot sequence;
- receiving a signal at the network element from at least one of the one or more mobile units in the access slot of the access slot group at the indicated start time for the access slot, wherein the signal includes a sequence of bits, wherein the at least one of the one or more mobile units selects the access slot of the access slot group;
- selecting a detection algorithm corresponding to the velocity range of the at least one of the one or the one or more mobile units relative to the network element;
- and
- detecting the sequence of bits using the detection algorithm, wherein the detection algorithm performs a coherent correlation between the received signal and a predefined sequence stored in the network element.
4 more elements
A network element comprising:
- a transmitter configured to transmit access group information to one or more mobile units, wherein the access group information indicates a start time for an access slot;
- a receiver configured to receive a signal from a mobile unit at the indicated start time for the access slot, wherein the signal includes a sequence of bits;
- and
- a processor operably coupled to the receiver and configured to:
- establish an access slot group corresponding to a velocity range of the mobile unit relative to the network element;
- establish a slot sequence for the access slot group, wherein the slot sequence is weighted based on a frequency of use of the one or more mobile units;
- select a detection algorithm corresponding to the velocity range of the mobile unit relative to the network element;
- and
- detect the sequence of bits using the detection algorithm, wherein the detection algorithm performs a coherent correlation between the received signal and a predefined sequence stored in the network element.
6 more elements
A mobile unit comprising:
- a processor configured to
- determine a velocity of the mobile unit relative to a network element;
- and
- identify an access slot group in which to transmit based at least in part on the velocity of the mobile unit;
- identify a slot sequence for the access slot group, wherein the slot sequence is weighted based on a frequency of use of one or more mobile units;
- a transmitter operably coupled to the processor and configured to receive access slot group information from the network element, wherein the access slot group information indicates a start time for an access slot and the slot sequence;
- and configured to transmit a signal to the network element in the access slot associated with the access slot group at the indicated start time for the access slot, wherein the signal includes a sequence of bits;
- and
- a receiver configured to receive an acknowledgement message from the network element, wherein the acknowledgement message is transmitted upon detection of the sequence of bits by the network element, wherein the sequence of bits is detected using a detection algorithm based at least in part on performing a coherent correlation between the received signal and a predefined sequence stored in the network element.
6 more elements
Dependencies are inferred from the claim text.