Reduction of handover latencies in a wireless communication system
AssigneeTexas Instruments Incorporated
InventorsShantanu Kangude, Pierre Bertrand, Ariton E. Xhafa
Life of this patent
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Abstract
Systems and methods for reduction of handover latencies in wireless communication systems are described herein. Some illustrative embodiments include a wireless mobile communication device that includes a wireless transceiver including a transmitter configured to transmit a first signal synchronized for reception by a first cellular node, and processing logic that couples to the wireless transceiver. Before the wireless transceiver receives a handover command the processing logic causes the transmitter to transmit a second signal for reception by a second cellular node to request allocation of an upload resource for communication with the second cellular node as part of an impending handover.
Claims24
A wireless mobile communication device, comprising:
- a wireless transceiver comprising a transmitter configured to transmit a first signal synchronized for reception by a first cellular node;
- and
- processing logic that couples to the wireless transceiver, wherein before the wireless transceiver receives a handover command, the processing logic causes the transmitter to transmit a second signal for reception by a second cellular node to request allocation of an upload resource for communication with the second cellular node as part of an impending handover;
- wherein an allocated resource of a plurality of resources allocated to the wireless mobile communication device is associated with an earlier point in time and the handover command is received after the earlier point in time;
- wherein another allocated resource of the plurality of resources is associated with a later point in time and the handover command is further received before the later point in time;
- and
- wherein the wireless mobile communication device uses the allocated resource associated with the later point in time for data transmission.
A plurality of cellular nodes, each comprising:
- a wireless transceiver comprising a transmitter and a receiver, and configured to transmit signals to, and receive signals from, a wireless mobile communication device;
- and
- processing logic that couples to the wireless transceiver;
- wherein before the processing logic of a first cellular node of the plurality of cellular nodes causes its transmitter to transmit a handover command, the receiver of a second cellular node of the plurality of cellular nodes receives a request to allocate an upload resource as part of an impending handover;
- wherein an allocated upload resource of a plurality of resources allocated to the wireless mobile communication device is associated with an earlier point in time and the handover command is transmitted after the earlier point in time;
- wherein another allocated upload resource of the plurality of resources is associated with a later point in time and the handover command is further transmitted before the later point in time;
- and
- wherein the wireless transceiver is configured to use the allocated upload resource associated with the later point in time for data transmission.
A method, comprising:
- receiving, by a target cellular node within a wireless communication system, a request to allocate an upload resource as part of an impending handover;
- transmitting, by the target cellular node in response to the request to allocate the upload resource, a message comprising synchronization and resource allocation information;
- transmitting, by a source cellular node, a handover command after the receiving by the target cellular node the request to allocate the upload resource;
- transmitting, by the source cellular node, the handover command after an earlier point in time, an allocated resource of a plurality of resources allocated to the wireless mobile device being associated with the earlier point in time;
- transmitting, by the source cellular node, the handover command before a later point in time, another allocated resource of the plurality of resources being associated with the later point in time;
- and
- using, by the wireless mobile device, the allocated resource associated with the later point in time to communicate with the target cellular node.
Dependencies are inferred from the claim text.