Webi) The MAC layer passes the received RLC PDU to the RLC layer. ii) The RLC layer removes the RLC header from the PDU. iii) If the received RLC PDU does not have any problem, mark it as positive ACK (but whether the ACK is sent now or sometime later or omitted is determined by some other RLC parameters). iv). WebOverall SR process (when to send SR) is controlled by MAC layer as illustrated below. (See 36.321 5.4.4 for details) Once SR is transmitted and eNB recieves it, eNB should send UL Grant (DCI 0) and UE has to send PUSCH in response to the UL Grant. The timing among SR, UL Grant, PUSCH varies on whether it is FDD or TDD.
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WebLike in LTE, RRCReconfiguration is the most complicated message in NR. Understanding this message in full detail is like understanding the full protocol stack of NR. You will see a good framework or starting point of understanding this message in 3GPP 38.331 - 5.3.5.3 Reception of an RRCReconfiguration by the UE. WebBSR (Buffer Status Report) This is mainly for Uplink throughput. If network or test equipment is configured to schedule uplink data transmission (PUSCH) based on BSR, network would not allocate large TBS unless UE send BSR with high value. If you need to troubleshoot throughput issues in this case, you need to check all BSR values and see if UE ... mercedes swivel seat base
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Webii) If you have access to eNB log, you have to check the data transmission status at each subframe and confirm that there is no data transmission at MAC/PHY level. iii) If you have access to UE log, you have to check the data reception or SR (Scheduling Request) / BSR (Buffer Status Report) for long enough to trigger CDRX sleep mode. WebLCID (Logical Channel ID) LCID is one of the most important component of a MAC header. Basically it tells the characteristics or the destination of the MAC data. For example, it tells whether the MAC data is for control signal or user data or signaling message etc. For the details, refer to MAC PDU Structure for SCH. WebBSR(Buffer Status Report) BSR is a kind of MAC CE from UE to Network carrying the information on how much data is in UE buffer to be sent out. Putting it another way, it is a … This site is for everything on 4G/LTE. MAC CE (MAC Control Element) When we … mercedes swiss star