tailieunhanh - WIRELESS TECHNOLOGYProtocols, Standards, and Techniques pdf phần 9

Uplink liên kết phát thanh được theo dõi bởi Node B. tình trạng đồng bộ hóa tất cả các bộ kết nối vô tuyến được kiểm tra Layer 1 trong Node B trong mỗi khung. Nguyên thủy được sử dụng để chỉ ra tình trạng như vậy để thất bại RL / phục hồi kích hoạt chức năng. | Uplink radio links are monitored by Node B. The synchronization status of all radio link sets shall be checked by Layer 1 in Node B in every frame. Primitives are used to indicate such status to the RL failure restored triggering functions. Only one synchronization status indication shall be given per radio link set. The criteria used to indicate in-sync or out-of-sync conditions are not subject to specification. Uplink DPCCH and DPDCH Reception Upon reception of the uplink dedicated channels namely DPDCH and DPCCH the following tasks are performed by the receiver of the base station Despreading of the DPCCH and buffering of the DPDCH using the maximum bit rate smallest spreading factor Estimation of the channel from the pilot bits received on the DPCCH every slot Estimation of the signal-to-interference ratio from the pilot bits every slot Transmission of the TPC command in the downlink direction to control the uplink transmission power every slot Decoding of the TPC bits to adjust the downlink power for the respective connection every slot Decoding of the FBI bits and adjustment of the diversity antenna phases or phases and amplitudes according to the transmission diversity mode over two or four slots Decoding of the TFCI information from the DPCCH to detect the bit rate and channel decoding parameters for DPDCH every 10-ms frame Decoding of the DPDCH according to the TTI 10 20 40 or 80 ms The reception in the downlink direction includes the functions as described before but some peculiarities are noted The dedicated physical channels DPDCH and DPCCH have a constant spreading factor but DSCH has a varying spreading factor. The FBI bits do not appear in the downlink direction. A common pilot channel is used in addition to the pilot bits on DPCCH. In case of transmission diversity the UE receives pilot patterns from the two antennas and the channel estimation is performed with these two patterns. o 2002 by CRC Press LLC Uplink Power Control Uplink .