Showing papers by "Rapeepat Ratasuk published in 2011"

Method and apparatus for using contention-based resource zones for transmitting data in a wireless network

Abstract: A user equipment (102) and method for contention-based uplink access to a base station. Contention-based configuration data identifies multiple contention-based access zones along with minimum power headroom values for each contention-based access zone (602, 604). The user equipment compares available power headroom to the minimum power headroom values and identifies candidate contention-based resource zones (606). The user equipment selects one of the candidate contention-based resource zones for use (608).

Uplink ack/nack signaling for aggregated carriers in a communication network

Abstract: A system and method for uplink ACK/NACK signaling for aggregated carriers in a communication network includes a step (400) of determining that a user equipment-specific configuration consists of at least two aggregated downlink carriers. A next step (402) includes instructing the user equipment to provide ACK/NACK feedback. A next step (404) includes receiving ACK/NACK feedback.

Method and apparatus for scheduling a control channel in an orthogonal frequency division multiplexing communication system

Abstract: A scheduler (224) capable of operating in an OFDM communication system (200) schedules a control channel for a user equipment (201) by determining (614) a channel quality metric associated with the user equipment, calculating (610) a target control channel element quality metric, determining (618) a control channel element utilization rate, wherein the control channel element utilization rate a past rate of utilization of control channel elements, and selecting (620) a control channel element aggregation level for the control channel based on the channel quality metric, the target control channel element quality metric, and the control channel element utilization rate. The scheduler then allocates (622) control channel elements to the control channel based on the selected control channel element aggregation level. The scheduler further may steal (624) power from one or more unused control channel elements and assign the stolen power to control channel elements assigned to the control channel.

Method and apparatus for allocating resource blocks in a wireless communication network

Abstract: A method and apparatus to allocate resource blocks includes determining the number of available resource blocks on an uplink channel (130) and determining the maximum number of contiguous unallocated number of resource blocks on the uplink channel. In addition, the method includes calculating a resource block load of the uplink channel for at least one user equipment (120) on the uplink channel wherein the resource block load is the sum of minimum of the resource block in a queue for the user equipment and the maximum number of contiguous unallocated number of resource blocks for the user equipment on the uplink channel. The method also includes allocating the minimum of the resource block in the queue for the user equipment and the maximum number of contiguous unallocated number of resource blocks when the resource block load is greater than or equal to the number of available resource blocks.