name: CCE
full_form: Control Channel Element
context: The physical downlink control channel carries scheduling assignments and other control information. A physical control channel is transmitted on an aggregation of one or several consecutive control channel elements (CCEs), where a control channel element corresponds to 9 resource element groups. The number of resource-element groups not assigned to PCFICH or PHICH is . The CCEs available in the system are numbered from 0 to, where . The PDCCH supports multiple formats as listed in Table 6.8.1-1 where PDCCH format 4 is supported only for non-MBSFN subframes in an MBMS-dedicated cell. A PDCCH consisting of consecutive CCEs may only start on a CCE fulfilling, where is the CCE number. Multiple PDCCHs can be transmitted in a subframe. Table 6.8.1-1: Supported PDCCH formats
description: A Control Channel Element (CCE) is a fundamental unit of resource allocation within the physical downlink control channel in LTE systems, as specified by 3GPP. It corresponds to 9 resource element groups and is used for transmitting scheduling assignments and other control information. The CCEs are numbered from 0 upwards and can be aggregated to form a physical control channel. The PDCCH (Physical Downlink Control Channel) supports multiple formats and may consist of consecutive CCEs, with specific rules governing their allocation and transmission within a subframe.
explanation: CCE is classified as a Channel because it represents a basic building block for the transmission of control information over the physical downlink control channel in LTE networks. Its definition and usage are integral to how control channels are structured and allocated, fitting squarely into the category of Channels within the context of 3GPP specifications.
section_title: 6.8.1 PDCCH formats
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