When the hierarchical cell structure hcs is used, the cells are divided into different layers on the basis of coverage. So when you try to test or troubleshooting cell selection step, you have to prove from ue side log that cell detectionsearch procedure were successful and complete. With umts deployments well underway, one of the key performance metrics is standby time. In idle mode, standby time depends on the cell reselection mechanism. In so doing, the architecture of the radio interface, 6 channel structures, the cdma physical layer, the. User description, gsm umts lte cell reselection and handover.
In this mode, control plane protocols include cell selection and reselection procedures. Here are important parameter that need to be set regarding 2g to 4g cell reselection in huawei network. Reference signal measurements rsrp,rssi,rsrq for cell. Sir, rscp or path loss etc in umts 1 or rssi etc in gsm.
Cell selection and reselection processes in rrc connected mode. The cell selection and reselection criteria described in this document are intended for idle mode. Intersystem cell reselection between wcdma and gsm enables the user equipment in idle mode to choose a new cell of another system to camp on, thus providing service availability when wcdma. Depending onthe measured quality of the camping cell, the ue may trigger intrafrequency.
Receive registration area information from the plmn, e. A novel cellselection optimization handover for longterm. User equipment ue procedures in idle mode and procedures for cell reselection in connected mode. Cell search and cell selection in umts lte application note. Before we learn the detailed cell reselection procedure in chapter 3, we will provide a brief overview of a cell reselection procedure in section 2. May 11, 2017 the mobile station is performing the detection and the selection or reselection on the basis of stored information indicating whether or not at least one of the candidate cells supports that the detection and the selection or reselection utilize the enhanced coverage mode. Remote work advice from the largest allremote company. The previous section described how initial cell selection will work and the difference between lte fdd and tdlte. A ue performs cell selection when it is either just being powered on from an off state, or when a handover failure occurs. Prioritybased cell reselection qualcomm incorporated.
According to the invention, a connection setup rejection message is used to direct a mobile communication means to attempt a new connection with certain parameter values such as a certain carrier frequency. Cell selection and reselection in lte ue free download as pdf file. Squal q qualmeas qqualmin srxlev q rxlevmeas qrxlevmin pcompensation dimana. Cell selection and or cell reselection is a process to connect and or reconnect the ue to the best target cell. Typically, a marco cell has large coverage and low priority, whereas a micro cell has small coverage and high priority.
Pdf with umts deployments well underway, one of the key. Umts air interface course description this course provides a comprehensive and detailed explanation of the umts air interface. Environmental education resources to commemorate earth days 50th anniversary. Intersystem cell reselection parameter optimization in umts. Then, we will look into what system information is required for the procedure and the criteria for the cell. However, only when specific criteria are fulfilled is the ue allowed to camp on that cell. Cell selection selectionreselectionhandover are the process of mobile terminal to select a suitable cell to be connected to. The ue supplies the eutran with downlink channel quality and neighbour cell information to enable the eutran to select the most suitable cell for the ue. Lte the umts long term evolution from theory to practice stefania sesia stnxp wirelessetsi, france issam toufik stnxp wireless, france matthew baker philips research, uk wiley a john wiley and sons, ltd, publication. These criteria for cell selection as well as cell reselection for lte are specified in 3. This paper presents an autotuning scheme, based on a fuzzy logic controller flc, for a standardized intersystem cell reselection iscr algorithm in a multiradio access technology network. The measurement used in the cell selection and cell reselection processes. If you have new 4g network in your project and inter working system 2g to 4g will be set properly, this post will be useful for you. Cell reselection general comments in the umts network, parameters are communicated to the ue over the air interface via system information blocks sibs and dedicated messages.
Before you think of cell selection cell selection is the procedure that happens when cell detectionsearch procedure were successful and complete. Intersystem cell reselection parameter optimization qualcomm. Mar 21, 2017 this post will tell you about parameter setting related cell re selection from 2g to 4g lte in huawei network. Only lte cells fulfilling the scriteria, that is cells with srxlev 0, are considered as candidates for cell reselection. May 30, 2015 training material umts cell selection and reselection 1.
In redirection procedure, target cell will not be allocating any radio resources upfront. With wcdma networks being deployed in europe and throughout the world, one of the big challenges is to make cell reselection and handover between gsm and wcdma work smoothly. The invention relates to methods pertaining to cell reselection in a cellular telecommunication system. Cell reselection parameter optimization in umts qualcomm. Ue is in idle mode and has completed the cell selection reselection process and has chosen a cell. At thebeginning of each drxcycle, ue wakes up, reacquires the camping cell, and reads its paging indicator channel pich. Umts togsm handover can be triggered by the ue speed estimation algorithm of the hcs.
Training material umts cell selection and reselection. Section ii provides an overview of the cell reselection mechanism and of the parameters involved. Ue is in idle mode and has completed the cell selectionreselection process and has chosen a cell. User equipment ue procedures in idle mode and procedures for cell reselection in. Umts cell selection reselection by anantharaman iyer on. Intersystem cell reselection parameter optimization. The contents of the present document are subject to continuing work within the tsg and may change following formal. Scribd is the worlds largest social reading and publishing site. The ue also monitors a paging channel to detect incoming calls and acquire system information. Jul 04, 2014 user description, gsm umts lte cell reselection and handover 4. With your irat cell reselection threshold settings you have. Cell search and cell selection in umts lte 4g 5g world.
Pdf user description, gsmumtslte cell reselection and. The cross reference between gsm, umts, 3gpp and etsi identities can be found. Public land ue network selection 36 cell selection and re selection 38 idle mode ue and dual rat 39 plmn and rat selection 39 cell selection and reselection 40 test of measurement report 41 test of classmark 41 dtm 42 measurement reports and cell change order procedures 42 iii table of content. Intersystem cell reselection parameter autotuning in a. 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 its initial attach to the network through cell 5. With the feature multirat mobiles can be requested to select a wcdma cell directly after the call release and hence preventing the mobile to first select a gsm. Whatever parameter is higher, pemaxpumax or 0, is the value used for pcompensation. Wcdma selection and reselection free download as powerpoint presentation. Wcdma cell selection and reselection parameters mtn ghana introduction the cell selection and reselection procedures allows the ue to look for a suitable cell in the selected plmn and camp on it. Note that call redirections during admission control cause a signi.
Pdf cell reselection parameter optimization in umts abou. The mobile terminal is configured to determine for each of the cells if the characteristics of the radio channel meet corresponding predetermined criteria compared to the received threshold values, and in response to outcome of the comparison determining at least one radio channel for reselection of a cell. Cell selection and reselection schemes in multirat networks. So ue has to release the radio connection in serving cell and use the target cell info provided in the rrc reconfiguration if any, else ue needs to do full scan to camp and further request for the radio resources in target cells. If the selection of a cell and rat in the cell reselection process is optimized by tuning offset parameters, it is possible to reduce the call redirections between rats during admission control needed in the network to accept a new call. When the mobile terminal is switched on, it must select the plmn public land mobile network and rat radio access technology. If more than one cell meets the cell reselection criteria above, the ue shall reselect the lte cell with the highest srxlev level among the cells meeting the criteria on the highest absolute priority layer.
Reference signal measurements rsrp,rssi,rsrq for cell reselection open script in the lte system, a ue must detect and monitor the presence of multiple cells and perform cell reselection to ensure that it is camped on the most suitable cell. Intersystem cell reselection between wcdma and gsmenablesthe userequipmentin idle modetochooseanewcell ofanother system to campon, thus providing service availability when wcdma coverage fades out. Pdf cell reselection parameter optimization in umts. Strategy of cell selection and reselection for normal service, the ue has to camp on a suitable cell, tune to that cells control channel s. Wcdma selection and reselection high speed packet access. Request pdf cell selection and reselection schemes in multirat. Cell reselection procedures in lte lteencyclopedia. Intersystem cell reselection between wcdma and gsm enables the user equipment in idle mode to choose a new cell.
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