lock every 20 milliseconds. The SPS function allows the eNB entity to avoid announcing the DCI control information in the PDCCH physical channel. The SPS function is configured by the eNB entity in RRC messages of establishment or re-establishment of the connection or establishment of Data Radio Bearer (DRB) containing the following parameter: - SPS C-RNTI identifier; - allocation periodicity, for example a transmission every 20 sub-frames for the voice; - number of the HARQ process of retransmission in case of errors, for the downlink. When the SPS function has been configured, the eNB entity uses the DCI control information transmitted in the PDCCH physical channel to activate or release it. When the SPS function has been configured, the mobile must, nevertheless, continue the analysis of the PDCCH physical channel, for the defined sub-frames by the DRX function to detect the DCI control information in relation to the allocation release. When the SPS function has been activated for the downlink, the sub- frame allocation of the PDSCH physical channel corresponds to the following formula: Radio Interface Procedures (10 * SFN + sub-frame) = [(10 * SFNstart time + subframestart time) + N * semiPersistSchedIntervalDL modulo 10240 The SFN start time and sub frame start time parameters correspond to the values of the frame and sub-frame number when the SPS function has been activated. The semiPersistSchedIntervalDL parameter corresponds to the allocation periodicity of resources for the downlink. When the SPS function has been activated for the uplink, the sub-frame allocation of the PUSCH physical channel corresponds to the following formula: (10 * SFN + sub-frame) = [(10 * SFNstart time + subframestart time) + N * semiPersistSchedIntervalUL + Subframe_Offset * (N modulo 2)] modulo 10240 The semiPersistSchedIntervalUL parameter corresponds to the allocation periodicity of resources for the uplink. The Subframe_Offset parameter is optional and its value is equal to ZERO for the FDD mode and is indicated in Table 4.6 