name: DCQR
full_form: Downlink Channel Quality Report
context: DCQR and AS RAI MAC control element is identified by a MAC PDU subheader with LCID as specified in Table 6.2.1-2. A MAC PDU shall contain at most one DCQR and AS RAI MAC control element. It has a fixed size and consists of a single octet defined as follows (Figure 6.1.3.19-1): - R: Reserved bit, set to "0"; - AS RAI: The field corresponds to Access Stratum Release Assistance Indication as shown in Table 6.1.3.19-1. The length of the field is 2 bits; - Quality Report: For a NB-IoT UE, if npdsch-16QAM-Config is not configured, the report mapping is defined in Table 9.1.22.15-1 in TS 36.133[ Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for support of radio resource management ]  [9] and if npdsch-16QAM-Config is configured the report mapping is defined in Table 9.1.22.17-1 in TS 36.133[ Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for support of radio resource management ]  [9]. For a BL UE or UE in CE, the field corresponds to DL channel quality report as defined in TS 36.133[ Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for support of radio resource management ]  [9]. The length of the field is 4 bits. Figure 6.1.3.19-1: DCQR and AS RAI MAC control element Table 6.1.3.19-1: Values for AS RAI
description: The Downlink Channel Quality Report (DCQR) is a MAC control element used in the context of Evolved Universal Terrestrial Radio Access Network (E-UTRAN). It provides information about the quality of the downlink channel, which is crucial for efficient radio resource management. The DCQR consists of a single octet containing a reserved bit, an Access Stratum Release Assistance Indication (AS RAI) field, and a Quality Report field. The AS RAI field indicates whether release assistance is required, while the Quality Report field provides a 4-bit report on the downlink channel quality. This information is used by the eNodeB to optimize resource allocation and ensure reliable communication.
explanation: DCQR is classified as a Message because it is a specific signaling data exchanged between network components (in this case, between the UE and the eNodeB) to convey information about the downlink channel quality. This aligns with the 3GPP's specifications for efficient radio resource management in E-UTRAN.
section_title: 6.1.3.19 Downlink Channel Quality Report and AS RAI MAC Control Element
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