Abstract:
A method and apparatus for processing data blocks during soft handover. The apparatus may be a wireless communication system including at least two enhanced uplink soft handover (EU-SHO) Node-B’s and a radio network controller (RNC) as shown in figure 1. Each Node-B decodes a received data block and forwards the decoded data block to the RNC. If the RNC receives at least one copy of a successfully decoded data block, the RNC uses a re-ordering function entity to process the copy of the successfully decoded data block to support in-sequence delivery to higher protocol layers. If the RNC receives more than one copy of a successfully decoded data block, the RNC discards the extra successfully decoded data block copies. The RNC is either a serving-RNC (S-RNC) or a controlling-RNC (C-RNC). Each Node-B includes a medium access control (MAC) entity that handles enhanced uplink dedicated channel (EU-DCH) functionalities.
Abstract:
A method and system for performing call admission control in wireless communication systems is disclosed. Resource units required by a new user are assigned based on an outage probability of each uplink timeslot. The outage probability (20) of each timeslot is updated as the resource units are assigned so that each resource unit assignment results in the lowest possible contribution to total outage probability. Once all of the resource units are assigned, the total outage probability is computed based on the resource allocation. If the total outage probability is below a predetermined value, the new user is admitted. If the total outage probability (32) is above the predetermined value, the new user is rejected.
Abstract:
Un método para unidades inalámbricas transmisoras/receptoras, WTRU, comprendiendo el método: que la WTRU reciba desde un Nodo B evolucionado (eNB) una primera asignación, siendo la primera asignación una asignación de un canal de control de enlace ascendente no sujeto a disputa, NCB, comprendiendo la primera asignación una configuración para transmitir solicitudes de planificación (SP) por el canal NCB de control de enlace ascendente, e indicando la configuración una periodicidad en la que los recursos físicos del canal NCB de control de enlace ascendente están dedicados a la WTRU para transmitir SP; transmitir una solicitud de planificación por el canal NCB de control de enlace ascendente según la primera asignación; que la WTRU monitorice un canal de control de enlace descendente; que la WTRU detecte que una transmisión por el canal de control de enlace descendente está prevista para la WTRU en función de un identificador de WTRU indicado en la transmisión por el canal de control de enlace descendente, comprendiendo la transmisión por el canal de control de enlace descendente una segunda asignación, siendo la segunda asignación una asignación de un canal compartido de enlace ascendente; y que la WTRU transmita datos por el canal compartido de enlace ascendente según la segunda asignación.
Abstract:
A method and apparatus for scheduling transmissions via an enhanced dedicated channel (E-DCH) are disclosed. A scheduled power is calculated for scheduled data flows. A remaining transmit power is calculated for the E-DCH transmission. A rate request message is generated, wherein the scheduled power, remaining transmit power and rate request message are used to select transport format combinations (TFCs) and multiplex data scheduled for the E-DCH transmission. The remaining transmit power is calculated by subtracting from a maximum allowed power the power of a dedicated physical data channel (DPDCH), a dedicated physical control channel (DPCCH), a high speed dedicated physical control channel (HS-DPCCH), an enhanced uplink dedicated physical control channel (E-DPCCH) and a power margin.
Abstract:
A method for implementing dynamic link adaptation in a cellular system by a user equipment (UE) having two coded composite transport channels (CCTrCHs) in an uplink time slot begins by estimating transmit power using a transport format combination (TFC) pair for the CCTrCHs. The total estimated transmit power for the two CCTrCHs is compared with a given threshold. Use of both TFCs is permitted when the total estimated power is less than the threshold.
Abstract:
A method and system for link adaptation in an orthogonal frequency division multiplexing (OFDM) wireless communication system are disclosed. The entire sub-channels are divided into a plurality of groups. A channel quality indicator (CQI) is generated for each group based on channel quality status in each group, and communication parameters are adjusted in accordance with the CQI.
Abstract:
A wireless communication method and apparatus for reporting traffic volume measurement (TVM) information used to support enhanced uplink (EU) data transmissions between a wireless transmit/receive unit (WTRU), i.e., a mobile station, and a Node-B. After storing EU data in a buffer, the WTRU sends an initial TVM information request message to the Node-B indicating that the WTRU has EU data available to send to the Node-B. In response, the Node-B schedules one or more allowed EU data transmissions. The WTRU transmits at least a portion of the stored EU data to the Node-B via the allowed EU data transmissions. In one embodiment, the initial TVM information request message is sent by the WTRU only after the quantity of EU data stored in the buffer of the WTRU exceeds an established threshold. Otherwise, all of the stored EU data is transferred to the Node-B without requiring scheduling by the Node-B.
Abstract:
A method and apparatus for assigning automatic repeat request (ARQ)/hybrid-automatic repeat request (H-ARQ) processes in a wireless transmit/receive unit (WTRU) to support enhanced uplink (EU) data transmissions. After parameters associated with the ARQ/H-ARQ processes are configured, the WTRU assigns an ARQ/H-ARQ process for selected data. After transmitting the data, the WTRU determines whether feedback information for the data has been received. The WTRU releases the ARQ/H-ARQ process if an acknowledgement (ACK) message has been received, and retransmits the data if a non-acknowledgement (NACK) message or no feedback information has been received in a predetermined time period while incrementing a transmission counter in the WTRU. When an ARQ/H-ARQ transmission limit has been reached, the WTRU may discard the data or reinitiate the transmission. An ARQ/H-ARQ process assigned for transmission of lower priority data may be preempted for transmission of higher priority data when there is no available ARQ/H-ARQ process.
Abstract:
A wireless communication method and apparatus for coordinating Node-Bs during handover for enhanced uplink (EU) transmission. In one embodiment, a radio network controller (RNC) initiates an inter-Node-B soft handover. A wireless transmit/receive unit (WTRU) establishes communication connections with a plurality of Node-Bs. A particular one of the Node-Bs is designated as being a primary Node-B, and each of other Node-Bs are designated as being a non-primary Node-B. The RNC informs all of the Node-Bs that the particular Node-B is a primary Node-B. The primary Node-B schedules EU transmission and performs ACK/NACK during soft handover. In another embodiment, the RNC initiates a hard handover for a WTRU connected to a source Node-B. The RNC sends an activation timer to the source Node-B to set the time for handover. As many previously negatively acknowledged (NACKed) data packets as possible are prioritized for retransmission in the source Node-B before the activation timer expires.