METHOD AND APPARATUS FOR PRIORITIZING LOGICAL CHANNELS

摘要

A method and apparatus are disclosed for prioritizing logical channels when a new transmission is performed. Logical channel resources are allocated for available data to a plurality of logical channels. A maximum bit rate (MBR) credit (i.e., token) is decremented in a buffer (i.e., bucket) associated with a particular one of the logical channels by the size of a medium access control (MAC) service data unit (SDU). The MBR credit may have a negative value. If any of the allocated channel resources remain, the logical channels are served in a decreasing priority order until the data is exhausted. A radio link control (RLC) SDU is not segmented if the whole RLC SDU fits into the remaining resources. The MAC SDU excludes a MAC PDU header and MAC padding.

主权项

1. A method implemented by a wireless transmit/receive unit (WTRU) for transmitting data, the method comprising:
receiving an uplink grant; determining that one or more Medium Access Control (MAC) control elements (CEs) that are not associated with padding are to be transmitted; allocating resources for transmission to the one or more MAC CEs that are not associated with padding, wherein the one or more MAC CEs that are not associated with padding are prioritized over a plurality of logical channels that have data currently available for transmission; determining that a first logical channel of the plurality of logical channels has first data currently available for transmission, wherein the first logical channel corresponds to a signaling radio bearer (SRB); allocating resources for transmission to the first logical channel, wherein the first logical channel is allocated sufficient resources to transmit the first data currently available for transmission, and a prioritized bit rate (PBR) credit is not used for the first logical channel; allocating resources for transmission to other logical channels of the plurality of logical channels that have data currently available for transmission, wherein the other logical channels correspond to data radio bearers and are each first allocated resources for transmission in a decreasing priority order up to respective PBR credits configured for each of the logical channels that correspond to data radio bearers; decrementing each respective PBR credit of the other logical channels that correspond to data radio bearers by an amount of resources allocated to a corresponding logical channel; determining that the PBR credits of the other logical channels that correspond to data radio bearers are each zero or less than zero; and allocating remaining resources available for transmission to the other the other logical channels in a decreasing priority order; and transmitting the allocated resources in accordance with the uplink grant.