| 摘要 |
The present invention relates to a method and apparatus for minimizing redundant enhanced uplink (EU) allocation requests and fault-isolating EU transmission failures which 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 through an uplink (UL) EU channel. In an embodiment of the present invention, if E-DCH allocation cannot be provided within a given time period, the Node-B transmits a confirmation message to the WTRU through a downlink (DL) EU signaling channel without transmitting E-DCH allocation information. The request is queued in the Node-B and the WTRU refrains from transmitting the same request until the time period expires or resources become available. In another embodiment of the present invention, appropriate actions are taken to correct EU transmission failures by determining whether an E-DCH allocation request has been unsuccessfully transmitted through the UL EL channel or whether channel allocation information has been unsuccessfully transmitted through the DL EU signaling channel. [Reference numerals] (202) Whenever a WTRU has E-DCH data to transmit, the WTRU transmits an E-DCH allocation request to a Node-B through a UL EU channel; (204) Can E-DCH allocation be provided within a channel request response time?; (206) Node-B transmits, to the WTRU, a confirmation message indicating that the E-DCH; (207) Node-B transmits scheduling information to the WTRU; (208) WTRU transmits E-DCH data through the UL EU channel according to the scheduling information; (210) Node-B transmits, to the WTRU, a confirmation message indicating that the E-DCH allocation request has been received, but does not transmit scheduling information; (212) Node-B stores the E-DCH allocation request in a request priority queue based on a priority indicated by the request, and a maximum allocation time timer in the Node-B is activated; (214) WTRU recognizes than the Node-B has been received the request and refrains from transmitting the same request again; (216) Nest TTI; (218) Are resources available for allocating the queued request(s)?; (220) Did the maximum allocation time timer expire?; (222) WTRU recognizes a resource allocation failure using its channel allocation timer or the Node-B notifies the WTRU of the failure; (224) WTRU retransmits the E_DCH allocation request or updated E-DCH allocation request; (226) If the WTRU has additional E-DCH data to transmit, the WTRU discards the data for which the WTRU requested allocation, and transmits an undated request; (AA) Start; (BB) Option 1; (CC) End |
