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Cell phone battery tracker1/27/2024 ![]() Either timer T3412 expires first or UE enters into a new Tracking Area which is not in the list. UE will send Tracking Area Update to the MME. Does it sends Tracking Area Update right away ? What is the best and sure way for UE to send a Tracking Area Update message back to the MME ? Is it the expiry of Timer T3412 or when UE finds itself in a new Tracking Area which is not in the Tracking Area List. It will update the PAST AND PRESENT information of TAs for the UE.Īnother important question to ask ourselves is. It will add the new Tracking Area in the Tracking Area List for the UE In this case UE is going to send an explicit Tracking area update message back to MME right away indicating the new TAC value UE has read.Īfter receiving the TAU message MME will do two things. This will be an indication that UE is in a new tracking area. If UE does not find the new TAC value in the Tracking Area list. UE will verify after reading TAC value of new tracking area and comparing it with the Tracking area list given to the UE. The fun begins, if the UE enters into a Tracking Area that is not included in the Tracking Area list given to the UE during registration. What if a UE does not find the TAC value in the Tracking Area List ? So what will happen in the actual network depends upon operator policies. All of this depends, what Adaptive paging strategy has been adopted and deployed by the operator. If still no response MME send paging to eNodeBs in the PAST list as well (depending). If UE does not respond to the paging request then it will send the paging message to all eNodeBs in the TA list included in PRESENT list. MME will send paging to the last known eNodeB first, which was used to send the tracking area update. In this case when a paging message arrives for the UE. However, if the previous scenario does not happen. On account of TAU procedure, paging message will be ignored. Unfortunately if a paging message arrives for the UE during the time UE is sending a TAU. What if a Paging Message Arrives during TAU ? MME once again will change Tracking Areas in the list once UE moves out of a TA Indicating to MME that it is a certain TA 1. Whenever this timer expires UE will send a Tracking Area Update (TAU) message to the MME. Let’s say UE was in tracking area TA 1 when it entered into Idle mode. Assuming there are three TAs included in the list for UE During registration UE will receive a tracking area list. Lets say that a UE is registered with a network. To keep track of this user mobility, UE’s position is tracked by the MME at tracking area level in MME.ĭon’t get it ? Let’s understand by an example. Keep in mind, UE keeps on entering, registering and leaving new and old tracking areas over time,as if the user remains in mobility. The UE will get registered with a new tracking area and the new TA will be added in the TA list. If a UE happens to pass through a tracking area which is NOT included in the tracking area. UE will keep on moving both in idle and connected mode in those tracking areas included in the Tracking Area list. When UE gets register to the network, it is given a tracking area list. MME keeps track of users’ mobility in Idle mode at tracking area level. What is the reason to have Tracking Areas ?Īs said earlier, Tracking areas make it convenient for the core network (MME) in this case to keep track of user terminals mobility even in case of idle mode. How many eNodeBs to group in one tracking area over another depends upon a number of factors such as market type, users behavior in the area, rural or urban area, signalling load etc. Tracking areas have a huge role to play in paging and keeping track of UEs mobility in Idle Mode.Ī Typical Depiction of Tracking Area in LTE ![]() You keep on getting phone calls, text messages, web information, mobile internet etc. In this way, no matter whatever your area and wherever your phone is. ![]() Tracking area is used by the MME in Idle mode to keep track of user terminals (UEs) mobility. These group of eNodeBs combined are termed as TA. The concept of tracking area (TA) is based on the simple fact, that a group of eNodeBs are combined together based on a particular value of tracking area code (TAC). Phone battery consumption ? What happens to tracking area in this case ? If want to relish all the details, continue reading. Can you tell me how tracking area is associated with your If you want to know the answer in two sentences or less. because I am travelling ”Ĭlose but not quiet precise. Which one will drain your phone battery the most ? If in both scenarios you don’t have to use your phone. 8 hours sitting at home on a Saturday or 8 hours on a roadtrip.
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