High-reliability modulation coding scheme and logical channel prioritization
摘要
說明書
As part of processing the PDCCH prior to transmitting the PDCCH to the UE 115-a, the base station 105-a may manipulate downlink control information carrying the uplink grant 215 by attachment of a CRC in a manner that depends on the new dedicated RNTI of the target UE (e.g. UE 115-a). For example, the base station 105-a may scramble the CRC with the new dedicated RNTI and/or the C-RNTI. As described above, the scrambled CRC with the new dedicated RNTI and/or the C-RNTI may be an indication to the UE 115-a that the uplink grant 215 uses an allowable MCS from the allowable MCS table. After scrambling the CRC, the base station 105-a may process the PDCCH using quadrature phase shift keying (QPSK) modulation and map the PDCCH onto allocated resource elements.
The resource element mapping for the PDCCH may be arranged using control channel elements. Depending on the length of the downlink control information, the base station 105-a may transmit the PDCCH scheduling message by mapping the message onto one, two, four or eight consecutive control channel elements. The control channel elements may also be organized into search spaces, which may be a common search space or a UE-specific search space. The common search space may be available to all UEs in a cell associated with the base station 105-a and may be located at fixed positions within a downlink control region. Alternatively, the UE-specific search space may be assigned to groups of UEs or a certain UE (e.g. UE 115-a) and have locations that depend on the new dedicated RNTI. Each search space may contain up to 16 control channel elements, such that the search space contains several locations where the base station 105-a may transmit downlink control information including the uplink grant 215.
