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US 8,711,765 B2Granted
Uplink synchronization management in wireless networks
AssigneeTexas Instruments Incorporated
InventorsPierre Bertrand, Shantanu Kangude
Life of this patent
Estimating the term…
Abstract
In at least some embodiments, a wireless networking system is provided. The wireless networking system includes a base-station and a plurality of user devices in communication with the base-station. The base-station selectively assigns each user device to one of a first group and a second group. Also, the base-station selectively assigns each user device to an uplink synchronized state and an uplink non-synchronized state. The base-station allocates a unique reduced identifier to each user device in the uplink synchronized state, but does not allocate unique reduced identifiers to user devices in the non-synchronized state.
Claims44
A wireless networking system, comprising:
- a base-station;
- and
- a plurality of user devices in communication with the base-station,
- wherein the base-station selectively assigns each user device to one of an uplink synchronized state and an uplink non-synchronized state,
- wherein the base-station allocates a unique reduced identifier to each user device in the uplink synchronized state, but does not allocate unique reduced identifiers to user devices in the non-synchronized state,
- wherein each unique reduced identifier is allocated as soon as a corresponding user device is assigned to the uplink synchronized state and wherein each unique reduced identifier is automatically released if a corresponding user device is reassigned from the uplink synchronized state to the uplink non-synchronized state.
3 more elements
A wireless networking system, comprising:
- a base-station;
- a plurality of user devices in communication with the base-station,
- wherein the base-station selectively assigns each user device to one of an uplink synchronized state and an uplink non-synchronized state;
- wherein the base-station allocates a unique reduced identifier to each user device in the uplink synchronized state for requesting resources in a contention-free manner, but does not allocate unique reduced identifiers to user devices in the non-synchronized state;
- and
- wherein the base-station maintains synchronization for each user device of the uplink synchronized state without a scheduling grant via a non-synchronized random access (NSRA) communication channel.
3 more elements
A wireless networking system, comprising:
- a base-station;
- a plurality of user devices in communication with the base-station,
- wherein the base-station selectively assigns each user device to one of an uplink synchronized state and an uplink non-synchronized state;
- wherein the base-station allocates a unique reduced identifier to each user device in the uplink synchronized state for requesting resources in a contention-free manner, but does not allocate unique reduced identifiers to user devices in the non-synchronized state;
- and
- wherein the base-station maintains synchronization for each user device of the uplink synchronized state without a scheduling grant via at least one of a sounding reference signal (SRS) and a dedicated scheduling request channel.
3 more elements
A wireless networking system, comprising:
- a base-station;
- and
- a plurality of user devices in communication with the base-station,
- wherein the base-station selectively assigns each user device to one of an uplink synchronized state and an uplink non-synchronized state,
- wherein the base-station allocates a unique reduced identifier to each user device in the uplink synchronized state, but does not allocate unique reduced identifiers to user devices in the non-synchronized state,
- wherein a given user device switches from the uplink synchronized state to the uplink non-synchronized state if more than a threshold amount of time passes without an uplink communication from the given user device.
3 more elements
A wireless networking system, comprising:
- a base-station;
- and
- a plurality of user devices in communication with the base-station,
- wherein the base-station selectively assigns each user device to one of an uplink synchronized state and an uplink non-synchronized state,
- wherein the base-station allocates a unique reduced identifier to each user device in the uplink synchronized state, but does not allocate unique reduced identifiers to user devices in the non-synchronized state,
- wherein a given user device switches from the uplink synchronized state to the uplink non-synchronized state if more than a threshold amount of time passes without timing adjustment received from the base-station.
3 more elements
A method, comprising:
- receiving uplink resource requests from a plurality of user devices of a wireless network, each of the resource requests indicating a priority level;
- assigning the user devices to one of a uplink synchronized state and a uplink non-synchronized state based on the priority levels;
- and
- managing uplink synchronization states of the user devices based on timers that track an amount of time that passes since at least one of a preceding uplink transmission and a preceding received timing adjustment command and based on scheduling requests received via a non-synchronized random access (NSRA) channel;
- allocating a unique reduced identifier to each user device of the uplink synchronized state for requesting resources in a contention-free manner, but not to user devices of the uplink non-synchronized state;
- and
- maintaining synchronization for each user device of the uplink synchronized state without a scheduling grant via at least one of the NSRA channel, a sounding reference signal (SRS), and a dedicated scheduling request channel.
4 more elements
Dependencies are inferred from the claim text.