link Control Channel (PDCCH) to detect the presence of paging. If the mobile is connected, in the RRC-CONNECTED state, discontinuous reception allows it to avoid analyzing all the PDCCH physical channels to detect the presence of data in the Physical Downlink Shared Channel (PDSCH) or power commands for the Physical Uplink Control Channel (PUCCH) or for the PUSCH physical channel. 8.4.3.4. UE CRI control element The UE Contention Resolution Identity (CRI) control element is transmitted by the gNB entity simultaneously with the RRC Setup message. The UE CRI control element contains either the Shortened Temporary Mobile Subscriber Identity (S-TMSI) if the mobile is attached to the Attach and Mobility Management Function (AMF), or a random value otherwise. As in the allocation of the TC-RNTI identifier, several mobiles can consider themselves to be the holder, the UE CRI control element then resolves the contention. NG-RAN and 5G-NR 8.4.3.5. TA control element The Timing Advance (TA) control element contains the timing advance value transmitted by the gNB entity. The TA control element ensures that data transmitted from several mobiles are synchronized at the gNB entity level. 8.4.3.6. PHR control element The Power HeadRoom (PHR) control element contains the indication of the mobile power reserve, the difference between maximum power and power used for the PUSCH physical channel. The PHR control element is periodically transmitted by the mobile, the periodicity being indicated in the RRC Setup or Reconfiguration message transmitted by the gNB entity. The PHR control element is also transmitted when the variation of the attenuation due to propagation is greater than a threshold indicated in the same RRC messages Release 10 introduced a control element that is used to indicate the power reserve for each of the aggregated Component Carriers (CCs). 8.4.3.7. MSI control element The MCH Scheduling Information (MSI) control element indicates scheduling information of the Multicast Channel (MCH). The MSI control element ind