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    • 8. 发明申请
    • METHOD AND APPARATUS FOR PERFORMING AN ENHANCED RANDOM ACCESS CHANNEL PROCEDURE IN A CELL_FACH STATE
    • 用于在CELL_FACH状态下执行增强随机访问通道程序的方法和装置
    • US20090186624A1
    • 2009-07-23
    • US12346498
    • 2008-12-30
    • Christopher R. CaveRocco DiGirolamoDiana PaniBenoit PelletierPaul Marinier
    • Christopher R. CaveRocco DiGirolamoDiana PaniBenoit PelletierPaul Marinier
    • H04W72/00
    • H04W72/14H04L1/1812H04L1/1887H04W28/26H04W72/04H04W74/0841H04W74/0866
    • A method and apparatus for performing an enhanced random access procedure in a Cell_FACH state are disclosed. A wireless transmit/receive unit (WTRU) transmits a random access channel (RACH) preamble for random access. If a positive acknowledgement (ACK) is received in response to the RACH preamble, the WTRU enters a contention resolution phase and transmits a message via an enhanced dedicated channel (E-DCH). If contention resolution fails, the RACH preamble is retransmitted. A contention back-off timer may be used for retransmission. A physical random access channel (PRACH) code may be reselected. The RACH preamble may be retransmitted using a reserved PRACH resource so that E-DCH resource is allocated to the collided WTRUs. Data transmitted during the contention resolution phase may remain in a hybrid automatic repeat request (HARQ) buffer. The MAC-i/is entity may be reset. All data sent during the contention resolution phase may be stored in a temporary buffer.
    • 公开了一种用于在Cell_FACH状态下执行增强的随机接入过程的方法和装置。 无线发射/接收单元(WTRU)发送用于随机接入的随机接入信道(RACH)前同步码。 如果响应于RACH前导码接收到肯定确认(ACK),则WTRU进入竞争解决阶段并通过增强专用信道(E-DCH)发送消息。 如果争用解决失败,则重传RACH前导码。 争用退避定时器可以用于重传。 物理随机接入信道(PRACH)码可以被重新选择。 可以使用保留的PRACH资源重传RACH前导码,使得E-DCH资源被分配给相互联系的WTRU。 在竞争解决阶段期间发送的数据可以保留在混合自动重传请求(HARQ)缓冲器中。 MAC-i /实体可能被重置。 竞争解决阶段期间发送的所有数据可能存储在临时缓冲区中。