Section: 5.2.5 Guard period for narrowband and wideband retuning
Content: For BL/CE UEs, a guard period of at most SC-FDMA symbols is created for Tx-to-Tx frequency retuning between two consecutive subframes. - If the higher layer parameter ce-RetuningSymbols is set, then equals ce-RetuningSymbols, otherwise . - If the higher layer parameter ce-pusch-maxBandwidth-config is set to 5 MHz, then the rules for guard period creation defined in the remainder of this clause do not apply for retuning between narrowbands but for retuning between widebands and for transmissions involving multiple widebands. - If a UE is configured with higher layer parameter ce-PUSCH-FlexibleStartPRB-AllocConfig and the allocation resources are not fully within one narrowband, the rules for guard period creation defined in the remainder of this clause apply for retuning between tuning narrowbands, where - In case of CEModeA, the tuning narrowband is defined as the 6 consecutive PRBs starting from defined in 8.1.1 of [4] with the center frequency set in the middle. - In case of CEModeB, the tuning narrowband is defined as the 6 consecutive PRBs with the center frequency set in the middle of allocated two PRBs. - If the UE retunes from a first narrowband carrying PUSCH to a second narrowband carrying PUSCH, or if the UE retunes from a first narrowband carrying PUCCH to a second narrowband carrying PUCCH, - if , a guard period is created by the UE not transmitting the last SC-FDMA symbol in the first subframe; - if , a guard period is created by the UE not transmitting the last SC-FDMA symbol in the first subframe and the first SC-FDMA symbol in the second subframe. - If the UE retunes from a first narrowband carrying PUCCH to a second narrowband carrying PUSCH, - if the PUCCH uses a shortened PUCCH format and , a guard period is created by the UE not transmitting the last SC-FDMA symbol in the first subframe; - if the PUCCH uses a shortened PUCCH format and , a guard period is created by the UE not transmitting the last SC-FDMA symbol in the first subframe and the first SC-FDMA symbol in the second subframe; - if the PUCCH uses a normal PUCCH format, a guard period is created by the UE not transmitting the first SC-FDMA symbols in the second subframe. - If the UE retunes from a first narrowband carrying PUSCH to a second narrowband carrying PUCCH, - a guard period is created by the UE not transmitting the last SC-FDMA symbols in the first subframe. - For CEModeA, if the PUSCH is associated with C-RNTI or SPS C-RNTI and the higher layer parameter ce-pusch-maxBandwidth-config is set to 5 MHz, - If the PUSCH resource allocation is within a 5 MHz wideband, the center frequency of the transmission bandwidth is the center frequency of the wideband; - If the PUSCH resource allocation spans two 5 MHz widebands, the center frequency of transmission bandwidth is in the center of PUSCH resource allocation. Furthermore, for BL/CE UEs configured with the higher layer parameter srs-UpPtsAdd, a guard period of at most SC-FDMA symbols is created for Tx-to-Tx frequency retuning between a first special subframe and a second uplink subframe for frame structure type 2 according to: - If the UE retunes from a first narrowband carrying SRS in the last UpPTS symbol to a second narrowband carrying PUSCH, - a guard period is created by the UE not transmitting the first SC-FDMA symbols in the second subframe. - If the UE retunes from a first narrowband carrying SRS in the last but one UpPTS symbol, but not in the last UpPTS symbol, to a second narrowband carrying PUSCH, - if , a guard period is created by the UE not transmitting the last UpPTS symbol in the first subframe; - if , a guard period is created by the UE not transmitting the last UpPTS symbol in the first subframe and the first SC-FDMA symbol in the second subframe. - If the UE retunes from a first narrowband carrying SRS to a second narrowband carrying PUCCH, - if , a guard period is created by the UE not transmitting the last UpPTS symbol in the first subframe; - if , a guard period is created by the UE not transmitting the last UpPTS symbol in the first subframe and the first SC-FDMA symbol in the second subframe. For , and for SRS transmission in a special subframe, a BL/CE UE is not expected to be configured with a first SRS transmission in symbol l and a second SRS transmission in any of symbols if the first SRS transmission and the second SRS transmission use different narrowbands.