Indicating E-DCH resources for E-RACH

摘要

In UMTS WCDMA a new RACH-based uplink is being discussed. The request for uplink transmission resource is made using a mechanism based on the conventional RACH. The main difference from the conventional RACH is that the data transmission uses a high-speed uplink packet data channel, known as Enhanced Dedicated Channel (E-DCH), instead of a single short message associated directly with the RACH preamble. One proposed scheme for indicating the E-DCH resources to be used creates a link between the values of each of a group of multiple signatures sent on the AICH (to acknowledge the E-RACH access) and a specific set of E-DCH parameters defined in a table. We propose to signal the set of resources to be used independently from acknowledging the E-RACH access. One possible method is to transmit information in the unused portion of the AICH (corresponding to 1024 chips every slot) indicating the resource set.

主权项

1. A method of a primary station giving a secondary station access to a resource:
receiving from the secondary station, a preamble for requesting access to the resource, wherein each resource is associated in a predetermined way to each preamble; modifying a response to the preamble depending on whether or not the resource associated with the preamble is available; transmitting only an acknowledgement indication of the access request when the resource associated with the preamble is available; and transmitting an acknowledgement indication and an identification of a different resource for use by the secondary station when the resource associated with the preamble corresponds with a high-speed uplink data packet channel and the resource is not available.