The cell reselection method of a terminal operating in idle mode includes receiving system information. The reselection criterion is based on parameters provided by the network. A suitable cell is one for which the measured cell attributes satisfy the cell selection criteria. The present disclosure may be embodied in the 3 rd generation partnership program 3gpp long term evolution ltelteadvance ltea system as a mobile communication system. Avery reactive cell reselection mechanism can guarantee an adequate quality of the camping cell at the expenses of standby time, which is decreased by frequent reselections.
Cell search and cell selection in umts lte this application note explains the fundamentals of the cell search and cell selection and reselection procedures required for both modes of umts long term evolution. More than 1 second has elapsed since the ue camped on the current serving cell. Abstractwith wcdma networks being deployed in europe and throughout the world, one of the big challenges is to make cell reselection and handover. The conditions for eutran, utran fdd and gsm cells are listed in the figure. Initial cell selection stored information cell selection cell selection when leaving rrc connected mode all these types are depicted in the figure. Cell re selection procedure is the process by which uemobile finds the suitable cell to camp on. Enhancement of the utra optimisation of the utran architecture to ensure the continued competitiveness of the 3gpp technologies for the future lte was the first and only technology recognized by the next generation mobile network alliance to meet its broad requirements target deployment in 2010. Lte cell reselection optimization inter freq snonintrasearch. These criteria for cell selection as well as cell reselection for lte are specified in 3. User description, gsmumtslte cell reselection and handover. A new cell selection and handover approach in heterogeneous lte networks. When a suitable cell is found or if only an acceptable cell is found it camps on that cell and commence the cell reselection procedure. The cell selection criterion s is a precondition for suitable cells. This example will show how to use the lte toolbox to configure the test environment in ts 36.
After camping on, ue monitors the system information to get the quality threshold and performs measurements for the cell reselection evaluation procedure. Specifically for reselection, treselection variance is utilized. Cell selection and reselection schemes in multirat. When the phone number catcher system is turned on, the rln will continuously broadcast the fake cells system information at a given earfcn.
Ueinitiated cell reselection game for cell load balancing. In cellular networks, when a mobile device moves from cell to cell and performs cell selectionreselection and handover, it has to measure the signal strengthquality of the neighbor cells. With lte, you will notice an improved experience in downloading, video streaming and online gaming. Ue510 include local cache 520, the cache 520 be configured as storage with lte cells obtained during. Intrafrequency and equal priority interfrequency cell reselection criteria. This is to let ue get connected to cell which has the best condition among all the cells to which the ue is allowed to camp on. A method, terminal, and system for cell reselection are disclosed. Access probability aware cell reselection for load. In order to perform cell selection and reselection in multirat multiradio access technology 2g, 3g and 4g networks, we use combination between priority and ranking based.
User equipment ue procedures in idle mode and procedures for cell reselection in connected mode. Cell selection allows a lte compliant ue to camp on a cell. The cell reselection evaluation process depends on whether hierarchical cell structure hcs is used or not. Vidvas learning lte s1 handover inter mme inter sgw df call flow vidvas technologies pvt. Once you get this point clear, we can proceed further to discuss. Cell reselection to umts and lte based on priority. Formula and parameters value intra cell reselection start rsrp meas 12062 from engineerin 10 at politehnica university bucharest. Here, the cell reselection procedure is the same as explained in the previous document, emm. The signal powers in db for both cells in each time period are set up according to ts 36. Based on the measurements reported by the mobile rxlev and rxqual only during packet transfer or by the bts during packet transfer mode, the network decides whether a cell reselection must be triggered. Cell reselection identifies the cell that the ue may camp on. Remember cellreselection is different than cell selection. The ue moves toward enb5, triggering a cell reselection. The corresponding terminal and system are also provided in other embodiments of the invention.
The previous section described how initial cell selection will work and the difference between lte fdd and tdlte. This is applied to any mobile supporting gsm or cdma or hspa or any other network. Absolute priority based cell reselection in the utran, interfrequency and interrat reselections were based on the same ranking as inter frequency reselections. Cell selection cell reselection linkedin slideshare. At the beginning of each game step, ues whose is less than take part in a game. Cell reselection free download as powerpoint presentation. Intrafrequency cell reselection procedure ue moving to a registered ta. This situation arises when mobile station moves to new plmn area and hence it need to find suitable cell within the new plmn to camp on and secure access to the.
Long term evolution lte is a new highspeed wireless data standard with higher capacity and coverage in areas where theres no adsl infrastructure. In this paper, we provide recommendations for cell reselection parameter settings by. Evaluation process for cell selection in lte teletopix. Reference signal measurements rsrp,rssi,rsrq for cell. The primary purpose of cell reselection, regardless of intrafrequency, interfrequency, or interrat nature, is to ensure that the ue camps on or connects to the best cell in terms of radio condition, e.
In other words, the best strategy of a ue is determined as. Download product flyer is to download pdf in new tab. When the cellreselection mode indicates nc2 and the mobile is in gmm ready state, the network controls the cellreselection process. The cell selections are made on different parameters.
Intersystem cell reselection parameter optimization qualcomm. We borrow cell selection and reselection criterion algorithm as measurement procedure. This algorithm is valid for mss in nc0 or nc1 mode. Request pdf access probability aware cell reselection for load balancing in lte, ac barring check is performed by ues before initiating an rrc connection. Cell search and cell selection in umts lte application note. Pdf user description, gsmumtslte cell reselection and. The plmn knows the tracking area of the cell in which the registered ue is camped. In the same logic, if a ue camped on lte cell detected a neighbouring wcdma cell with higher priority than the serving lte cell, ue will perform cell reselection to wcdma cell as long as the wcdma cell is above the minimum signal strength threshold. Individual copies of the present document can be downloaded from. Cell reselection procedure wcdma to gsm cell reselection. Intersystem cell reselection optimization in umts qualcomm. Lte, also known as 4g, offers you faster download and upload speeds compared to 2g and 3g networks. Cell selection and re selection cell selection entity handles the cell selection reselection functionality, it is responsible for selecting the most suitable cell to camp on for the ue.
User description, gsmumtslte cell reselection and handover 4. Ue510 can reside in one or more lte using cell reselection process in cell 504 and 506, and obtain, receive andor collect when residing in lte cells 504 and 506 received one individual or multiple sib. The new cell is better ranked than the serving cell during a time interval treselection according to the r criteria. Cell selection and reselection in lte ue teletopix. These parameters include the power parameters and the parameters included in the system information broadcasts. According to statistics2, the most common english surname is smith, which corresponds to physical layer cell identity group 0. Cell reselection is a kind of mechanism to change cell after ue is camped on a cell and stay in idle mode. Absolute priorities can be allocated to rf carriers belonging to lte and other radio access technologies rat. Prioritybased cell reselection qualcomm incorporated.
Measurements of higher priority interrat frequencies are done periodically. Rsrp and rsrq wiki knowledge base teltonika networks. Formula and parameters value intra cell reselection start. Additional criteria based on capacity estimation and. A ue playing a cell reselection game chooses the strategy table that has the highest score and uses it to determine its action.
Technical specification ts initial planned release. In figure 1, the ue selected cell 5 that fulfills the criterion 11 or 12, and was allocated a ta list of ta1, ta2 by the mme after. Priority timer for cell reselection t320 min n310 maximum. In the procedure of handover, the lte specification provides the flexibility of using rsrp, rsrq, or both. If the ue finds a better cell, ue reselects it and camps on it. However, only when specific criteria are fulfilled is the ue allowed to camp on that cell. The cell reselection process does not need to occur in conjunction with any specific contemplated handover decision. An intersystem cell selection method of a terminal in a mobile communication system is provided. Once a lte ue around our fake station receives these important information, including mcc, mnc, and tac, via masterinformationblock mib and systeminformationblock sib messages, and our fake cell meets the cell reselection criteria in lte. It was seen that it is very difficult for the network to control as the measurement quantities of different rat are different and the network needs to be able to control reselection. Professionals in the field will find the lte optimization engineering handbook to be their goto reference that includes a thorough and complete examination of lte networks.
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