![]() ![]() As an example, we note that RRC signalling messages and NAS messages (that also go through RRC) use DCCH. CCCH, DCCH and DTCH are also present in the downlink.PUCCH carries uplink control information although these could be sent on PUSCH as well.Like, PDSCH in downlink, PUSCH has flexible configuration that can be adapted to link conditions. PUSCH carries UL-SCH, which carries CCCH, DCCH and DTCH logical channels.Random access preambles carried on RACH help overcome message collisions due to multiple UEs transmitting at the same time. PRACH is used by UE for initial access to the network. PRACH carries RACH, which has no mapped logical channel.Uplink physical channels include Physical Random Access Channel (PRACH), Physical Uplink Control Channel (PUCCH), and Physical Uplink Shared Channel (PUSCH). Uplink transport channels include Random Access Channel (RACH) and Uplink Shared Channel ( UL-SCH). Uplink logical channels include Common Control Channel (CCCH), Dedicated Control Channel (DCCH) and Dedicated Traffic Channel (DTCH). In 5G NR uplink, what's the channel mapping?ĥG NR uplink channel mapping.PDCCH is used to schedule transmissions on PDSCH and PUSCH.It can be adapted to current link conditions. PDSCH carries a variety of transport channels.Once a connection is established, DCCH and DTCH become available to the UE. CCCH is used by a UE during initial access when there's no RRC connection yet.This is used to page a UE whose cell location is unknown. PCCH goes on PCH, which goes on PDSCH.PBCH is used by UE for cell acquisition, selection and re-selection. BCCH for System Information Blocks ( SIBs) goes on DL-SCH, which goes on PDSCH. BCCH for Master Information Blocks ( MIBs) goes on BCH, which goes on PBCH.In terms of mapping we note the following: Downlink physical channels include Physical Broadcast Channel (PBCH), Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH). Downlink transport channels include Broadcast Channel (BCH), Paging Channel (PCH) and Downlink Shared Channel ( DL-SCH). ![]() Source: Electronics Notes 2021.ĭownlink logical channels include Broadcast Control Channel (BCCH), Paging Control Channel (PCCH), Common Control Channel (CCCH), Dedicated Control Channel (DCCH) and Dedicated Traffic Channel (DTCH). ![]()
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