| 摘要 |
A method and apparatus for minimizing redundant enhanced uplink (EU) allocation requests and fault-isolating EU transmission failures that occur between a wireless transmit/receive unit (WTRU) and a Node-B. The WTRU transmits an enhanced dedicated channel (E-DCH) allocation request to the Node-B over an uplink (UL) EU channel. In one embodiment, if E-DCH allocation cannot be provided within a predetermined time period, the Node-B sends an acknowledgement message to the WRTU via a downlink (DL) EU signalling channel without sending E-DCH allocation information. The request is queued in the Node-B and the WTRU refrains from transmitting the same request until after the time period expires or resources become available. In another embodiment, appropriate actions are taken to correct EU transmission failures by determining whether an E-DCH allocation request was unsuccessfully delivered via the UL EU channel or whether channel allocation information was unsuccessfully delivered via the DL EU signalling channel. 102 104 100 106 WTRU 110 NODE-B(S) 116 RNC UL EU CH MAXIMUM TIME TO CHANNEL ALLOCATE TIMER lub/lur RESPONSE DL EU SIGNALING CH REQUEST PRIORITY TIMER QUEUE -118 112 Q___ 114 FOR EACH TIME THE WTRU HAS E-DCH DATA TO TRANSMIT, THE 302 -WTRU SENDS AN E-DCH ALLOCATION REQUEST TO THE NODE-B AND ACTIVATES A CHANNEL ALLOCATION RESPONSE TIMER IN THE WTRU. 304 THE WT7RU FAILS TO RECEIVE A RESPONSE FROM THE NODE-B 304 BEFORE THE CHANNEL ALLOCATION RESPONSE TIMER EXPIRES. THE WTRU RETRANSMITS THE E-DCH ALLOCATION REQUEST OR AN 306~ UPDATED E-DCH ALLOCATION REQUEST WITH A RETRANSMISSION INDICATOR. THE NODE-B RECEIVES THE RETRANSMITTED REQUEST OR UPDATED REQUEST. NO HAS THE E-DC YES ALLOCATION REQUEST 312) _BE EVD 314 THE NODE-B DETERMINES THAT THE THE NODE-B DETERMINES THAT THE REQUEST WAS NOT DELIVERED SUCCESS- CHANNEL ALLOCATION ON THE DL EU FULLY ON THE UL EU CHANNEL SIGNALING CHANNEL HAS FAILED AND TAKES A CORRECTIVE ACTION. AND TAKES A CORRECTIVE ACTION. THE NODE-B PROCESSES THE REQUEST. 316 |
