The release is requested due to inter-RAT redirection or intra-LTE redirection. One of the many issues with LTE Circuit Switched Fall Back (CSFB) is what happens when the UE falls back on the target RAT (can be 3G or 2G, operator defined) and the LAC is not the same as the one the UE is registered on through the Combined Attach procedure in LTE. 2 PDP Context Management. When the source eNodeB receives a UE Context Release message from the target eNodeB or receives a UE Context Release Command message from the MME, indicating that the UE successfully accesses the target cell, the source eNodeB counts the number of successful intra-frequency HO executions in the source cell at point C. Resp Store XRES* Calculate HXRES* RES* Store HXRES*. During the 'LTE attach' procedure, the network establishes this Bearer between the UE and the PGW. com At high level view, LTE RRC has only two status (RRC Connected and RRC Idle). The architecture of LTE and the interfaces of the EPS are shown in Fig. The default bearer has neither QoS treatment nor TFT filters for user data. In LTE release 12 specifications, only the case of one MeNB and one SeNB is considered. There are two types of frame structure in the LTE standard, Type 1 and Type 2. In fact,the 3GPP standards for MC communications were developed by a diverse body of telecommunications industry stakeholders with an eye specifically to the user experience, technical requirements and particular challenges present in the LMR and public safety ecosystems. A blog about LTE. Only when the UE reattaches to the network can the user context data be relearned. The only difference between Options 3 and 3A is based on whether the user plane data is sent to NR directly or via the LTE RAN. As seen form the diagram there are 2 RRC states defined for the UE. We are providing online LTE training all over the country. Default LTE attach context that was assigned back from the network. The model assumes a traffic pattern with a fixed file size. This course is NOT for you if you do not have knowledge of LTE Air Interface operations, configuration and LTE Optimization. Its basis stands in the GSM/EDGE and UMTS/HSPA network technologies, with changes in terms of an increased capacity and higher speed by simplifying the core network and using a different radio interface. LTE UE (User Equipment) Category & Class Definitions. However, in NB-IoT, a UE in CE only uses long DRX cycles. Most important QoS parameter is QCI; at top level it tells the kind of service that can be supported by the bearer and at implementation level, it maps to measurable values of so called "standardised QCI characteristics". b) L3 shall create a shared memory for the UE and this shared memory will be mapped to the Trace file with name and format as defined in 3GPP specs 32. Upon reception of the UE CONTEXT. 3GPP Work Item = 330020 (LTE-interfaces) This page lists the approved Change Requests to 3GPP Technical Specifications and Reports associated with the above work item. All the functions and protocols needed for this transfer and the control operations of the E-UTRAN Uu interface are implemented in the eNodeB. LTE utilises the LTE UE Category or User Equipment categories or classes to define the performance specifications of LTE devices and enables LTE base stations to be able to communicate effectively with them knowing their performance levels. 5G network, was deployed in live networks starting after the year 2000. cid: connection ID, see LTE. Version Date Update V1. • NAS signaling transport functions between UE and MME. If eNB doesn't have the UE context then UE moves to RRC_IDLE state started when. Data Resp Generate AV Auth. In the scenario described here Serving GW is also unchanged. Chapter 2 provides a description of how S1 release is performed, and. The details of all the interfaces in EPC and E-UTRAN are further discussed. The relay node (RN) in Long-Term Evolution-Advanced (LTE-A) networks is used to enhance the coverage of high data rate and solve the coverage hole problem. Proxy Mobile IP is being used for the CDMA and Wimax stuff for the communication to UE, where a Mobility Access Gateway (MAG) communicates with a Home Agent termed as Local Mobility Anchor (LMA) for the UE database update and Routing area update and Location area update! So why we are giving this space in LTE as well?. , handover between LTE and UMTS). It could also be called as Non-Standalone (NSA) NR in Evolved Packet System. CS UDI video/ SMS/ LCS/ USSD). 3GPP Work Item = 330020 (LTE-interfaces) This page lists the approved Change Requests to 3GPP Technical Specifications and Reports associated with the above work item. However, LTE RRC Connection Setup Complete message does not carry this kind of information. LTE Emulators v10. The UE security capabilities list is provided by the MME in the S1-AP procedures during the initial UE context setup request or during the handover resource preparation phase for the S1- initiated intra-LTE handover. In the LTE network, the EPS bearer QoS is controlled using the following LTE QoS parameters:. PDP context is the message format for the understanding of GPRS support nodes for GTPv1 session establishment, updation, termination, quality of services and other specific requirements. Medium Access Control (MAC) for LTE. By selecting LTE job as your career, you can surpass your limitations. This protocol works along with other L2 protocols RLC (Radio Link Control) and MAC (Medium Access Control). UE context located UE context transferred Figure 2 - LTE RLF Handover Procedure 1 Logs taken from drive-tests in multiple dense urban areas for existing 3G systems (e. Generates and process X2-AP (valid and invalid) messages. UE -AMBR: UE Aggregate maximum bit rate is the maximum allowed total non-GBR throughput among all APN to a specific UE. The UE location is known in the MME to at least an accuracy of the tracking area list allocated to that UE. The technology can reach downlink peak rates of 100Mbps and uplink speeds of 50Mbit/s, using variable bandwidth from 20Mhz down to 1. LTE指标优化及TOP小区分析指导(图文详解) 1 掉线率. Along with the. Generally if UE is in RRC Idle state, ENB will inform to UE via paging message about CS domain i. Overview of LTE Network 1. The MME validates the UE's presence in the TA (Tracking Area). • NAS signaling transport functions between UE and MME. Resp Store XRES* Calculate HXRES* RES* Store HXRES*. Ø LTE-Uu: Allows data transfer between the eNodeB and the UE's. Authentication to Suppliers. In the context of the LTE toolbox, a resource grid is just a MATLAB matrix and let just call it G1 (for UE1). Manages and stores UE context (parameters of the IP bearer service, network's internal routing information) Performs replication of the user traffic in case of lawful. Supports LTE Control plane. The LTE Toolbox™ product provides a set of channel models for the test and verification of UE and eNodeB radio transmission and reception as defined in and. However, LTE RRC Connection Setup Complete message does not carry this kind of information. 특정 UE에 대한 new MME에서 active bearer context를 new MME는 GW가 포함된 Delete Session Request (LBI) 메시지 전송에 의해서 bearer context를 삭제한다. A PDP context contains routing information for packet transfer between an MS and a GGSN to have access to an external packet-switching network. It is present in UE and eNodeB. Abstract: This article explains 3GPP Release 8 LTE NAS Security. This protocol works along with other L2 protocols RLC (Radio Link Control) and MAC (Medium Access Control). The release is requested due to inter-RAT redirection or intra-LTE redirection. The only difference between Options 3 and 3A is based on whether the user plane data is sent to NR directly or via the LTE RAN. America and Asia. PDP context activation is initiated by the UE and changes the session management state to active, creates the PDP context, receives the IP address and reserves radio resources. figure : Basic EPS entities and interfaces The LTE network was then introduced as a flat architecture, with user plane direct tunneling. With technological advancement of the wireless networks, dependencies and business impact of the mobile network services have increased phenomenally. LTE Quick Reference - RRC Status Home : www. If the MME has changed since the last detach, or if there is no valid subscription context for the UE in the MME, the MME sends an Update Location Request message to the HSS. Official Document FCM. Embodiments disclosed herein relate to a method in a wireless communication device that operates in an enhanced coverage mode, the enhanced coverage mode comprising sequential repetition of messages sent from the wireless communication device to a network node. when the ID is set here it will be remembered when doint connect so no need to specify again. Reduced M2M Signaling Communications in 3GPP LTE and Future 5G Cellular Networks Pilar Andres-Maldonado, Pablo Ameigeiras, Jonathan Prados-Garzon, Juan J. 747 Enhanced CRS and 4Rx SU-MIMO Interference Mitigation Performance Requirements for LTE. * The UE moves between both eNBs, it reports measures to the serving eNB and * the 'source' (serving) eNB triggers the handover of the UE towards * the 'target' eNB when it considers it is a better eNB. During HO, HO amount which success is measured in the cell souce. For normal user traffic (as opposed to broadcast), there is no centralized controller in E-UTRAN; hence the E-UTRAN architecture is said to be flat. • The eNodeB will pass this message to the UE • Activate Default Bearer Request • The message initiates the default bearer setup on the UE. LTE cell supports a PLMN that the UE is allowed to use (naturally, your operator), and the UE will continue on to check the cell barred status. Control plane between UE and MME at the radio interface. During the 'LTE attach' procedure, the network establishes this Bearer between the UE and the PGW. If the UE context is not present anywhere in the network (in old or new MME) and the Attach Request was Get LTE for Public Safety now with O’Reilly online learning. Some of the NAS message sends to an UE through RRC Connection Reconfiguration message as piggybacked and some as DL Info transfer. Reference: TS 36. The 9471 WMM SRS maintains UE context restoration data for all the subtending MMEs in its pool. LTE Call Flows ATT Best Practices: LTE Performance & Optimization Rethink Possible Fraz. 2018 11:18:24 Rohde & Schwarz White paper | LTE mobile network optimization – a definitive guide 3 It is important to understand that regardless of the domain (radio or core) and technology,. 1- UE send. Independent reporting of NR capabilities 3. Students perform root cause analysis and gain an in-depth understanding of these signaling events to network performance. CK and IK are then used by the ME as key material to compute a new key, KASME. A measurement defined as the total received wideband power observed by a UE from all sources, including co-channel serving and non-serving cells, adjacent channel interference and thermal noise within the measurement bandwidth. This post covers the LTE RRC state diagrams for UE. User plane entity (UPE): Manages and stores UE context, DL UP termination in LTE_IDLE, ciphering, mobility anchor, packet routing and forwarding, initiation of paging - The UPE terminates, for idle-state UEs, the downlink data path and initiates paging when downlink data arrives for the UE. The specific QCI value is allocated for each UE and is informed to UE via 'Activate EPS bearer context request' message. However, LTE RRC Connection Setup Complete message does not carry this kind of information. Handover in Long Term Evolution (LTE), as in previous generation of cellular systems, is a procedure to transfer a user equipment (UE) and its context from a source evolved NodeB (eNB) to a target eNB. Supports LTE Control plane. LTE : Tunnel Identifiers (GTPv2) From my LTE mind map in the last post, understanding bearers is the most important thing. The following signaling is covered: UE Attach, authentication and security signaling; Setup of two EPS Bearers (RAB id 5 and 6) Release of UE context due to inactivity; Reestablishment of the UE context with a Service Request. Device Requirements. In this option, LTE is used as the control plane anchor for NR, and both LTE and NR are used for user data traffic. - Status Transfer: This functionality transfers PDCP SN Status information from source eNB to target eNB in support of in-sequence delivery and duplication avoidance for intra LTE handover. S1-MME control plane and S1-U user plane connections for any bearers are also removed. Now, in LTE-NR DC operation in which the LTE eNB is the MN, it would be necessary to enhance processing power and buffer size in the LTE eNB to support this MCG split bearer as the bandwidth on. Test cases verify conformance of actions such as UE attach/detach, periodic updating, E-RAB setup, X2 setup, Handover procedure, UE context release. It requires efficient handover decision algorithms in order to optimize both UE and network performance. The CSG is a mode within the standard, defining which users can connect to a given eNB. The MME validates the UE's presence in the TA (Tracking Area). The eNodeB initiates the release of the UE context if the data service has been inactive for some time. S1-MME control plane and S1-U user plane connections for any bearers are also removed. RRC Connection Releaseで呼解放した後、再度UEを接続できない 8 MME software process may stop unexpectedly. To provide these services LTE reuses CS infrastructure when the UE is served by E UTRAN. Security is also the responsibility of MME. 无线掉线率=(eNodeB发起的S1 RESET导致的UE Context释放次数+UE Context异常释放次数)/UE Context建立成功总次数*100%. In LTE the UE has to be able to perform cell search without an explicit neighbour cell list being provided. The detection method implemented plays a significant role in the resulting performance of MU-MIMO systems, and the main problem leading to the notion of infeasibility of MU-MIMO mode in LTE is the receiver structure employed by the UE being unaware of the interference created by the signal for the other UE. The procedures for the Non Access Stratum, especially power management procedures are substantially similar to UMTS. LTE cell supports a PLMN that the UE is allowed to use (naturally, your operator), and the UE will continue on to check the cell barred status. LTE Long term evolution the UE as EMM_registered or EMM_unregistered mobility LTE – With a Walk to Small Cell | Dec 2012. What is KPI | What are LTE KPIs, key performance indicators. In the user plane, the eNodeB packet routing and transfer func-tions implement the EPS bearer and connectivity to the serving Packet Data Network (PDN) gateways. type: PDP context type either LTE. The UE can have up to 11 PDP contexts active concurrently. In this state, the UE doesn't have any connectivity to the EPC, and all context relating to the UE is removed from the E-UTRAN. After storing the NAS security context and deleting the EPS bearer context upon receipt of the Detach Request message from the MME in Step 1), the UE sends the a Detach Accept message as a response to the request in Step 1). Students analyze LTE signaling messages through UE logs and map them to success and failure events. Some of the NAS message sends to an UE through RRC Connection Reconfiguration message as piggybacked and some as DL Info transfer. Protocol dependencies. Intra E-UTRAN Handover is used to hand over a UE from a source eNodeB to a target eNodeB using X2 when the MME is unchanged. This page describes KPI (key performance indicators) basics including its categories and mentions LTE KPIs. LTE ENodeB:: Understanding and implementing client requirements and making the product compliance to LTE specifications. Lte call flow 1. 1: See source(s) of contained IEs: UE-Radio-Capability: 0. to-end functional capability tests for services over Long Term Evolution (LTE) (LTE data, Circuit Switch (CS) Fallback voice and SMS over SGs) relating to the international roaming of a User Equipment (UE), belonging to a Home Public Land Mobile Network (HPLMN) (a), to and within a visited PLMN (VPLMN) (b). You may refer introductory articles on LTE here. User plane entity (UPE): Manages and stores UE context, DL UP termination in LTE_IDLE, ciphering, mobility anchor, packet routing and forwarding, initiation of paging - The UPE terminates, for idle-state UEs, the downlink data path and initiates paging when downlink data arrives for the UE. Get Resp Auth. At the eNB level, this can be seen as an abnormal release which is verified from the cause code inside the Context Release message. " A UE transitioning from the EMM-DEREGISTERED to EMM-REGISTERED state without an EPS security context typically requires the Extended Pedestrian A (EPA) AKA procedure to be run; however, the process is optional if cached security context is used. In this state, the UE shall always have. During the 'LTE attach' procedure, the network establishes this Bearer between the UE and the PGW. LTE radios). The LTE Toolbox™ product provides a set of channel models for the test and verification of UE and eNodeB radio transmission and reception as defined in and. This is an optional field/IE that included by UE. This provides all the PDP context, Secondary PDP Context or Modify PDP context reject cause values and their Descriptions. WHO IS THE TARGET AUDIENCE ? The course is for ANYONE who is appearing for an interview in 4G LTE RF related role. They simply need to upload new software as long as the devices operate within its LTE network. Initiated by network in response to PDN connectivity request from UE. If the UE needs to have multiple data sessions, due to various Quality of Service (QoS), the UE will do a Secondary PDP Context activation. Take notice when you’re connected to non-LTE networks (e. UE Testing: You are feeding an unknown base station signal into a UE receiver and want to check the content eNB or UE: • You have a low level interoperability problem • You need to find out why throughput results are not as high as you expected or: You need to understand the structure of the signals & operation of the LTE radio system. ue-context-release-request message This message is sent by the eNB to request the release of the UE-associated S1-logical connection over the S1 interface. Generally if UE is in RRC Idle state, ENB will inform to UE via paging message about CS domain i. e Authentication performs in both UE side and MME side. Home LTE NB-IoT 5G(NR-NSA) In this section we will learn about reference signal and its basics as well as interview questions. The Session activation goes on with the following set of messages. This version added more MME encoding and decoding to the LTE library, pulled in a patch from Ruben Merz to add USRP X300 support for LTE_fdd_dl_scan and LTE_fdd_enodeb, added to enodeb_nat_script. On the tx side of the uplink, I am assuming that you are able to create one resource grid for one UE for one subframe. 413-f10 Procedure: Initial-Context-Setup. UE co-existence The coexistence between LTE Downlink FDD 716-728 MHz and Band 12 DL has been considered earlier but in a different context with a MediaFLO broadcast interferer in Block D and possibly also Block E. This post covers the LTE RRC state diagrams for UE. This means that the MS will have as many PDP addresses as activated PDP contexts. communication in PMR context so that the voice capacity of LTE is not increased as expected of PMR providers. It is responsible for idle mode UE (User Equipment) paging and tagging procedure including retransmissions. So once UE context removed then Release Access Bearer Request will remove all the bearers between SGW and ENB. In addition during UE capability information message UE exchange information about its capabilities as well. using their data and voice services. Otherwise it is optional. LTE: Does the bearer(s)/session(s) get deleted when CS fallback happen for an UE? What does relay node indicator IE presence in Initial UE message signify ? LTE HO : Why two MME UE S1AP IDs present within the S1-AP HO Request message ? When does a MME trigger UE context modification procedure towards an eNodeB for an UE ?. By doing so, the eNB releases all the radio resources and bearers allocated to the UE, and deletes the UE contexts. After storing the NAS security context and deleting the EPS bearer context upon receipt of the Detach Request message from the MME in Step 1), the UE sends the a Detach Accept message as a response to the request in Step 1). The MME validates the UE's presence in the TA (Tracking Area). For Non-GBR bearers, per UE and per PDN/APN specific aggregate bit rate parameters apply as shown above. In the LTE network, the EPS bearer QoS is controlled using the following LTE QoS parameters:. LTE X2 Handover Call Flow Procedure Prashant Panigrahi December 4, 2013 4 Intra-LTE (Intra-MME/SGW) handover using the X2 interface is used to handover a UE from a source eNodeB (S-eNB) to a target eNodeB (T-eNB) using the X2 interface when the Mobility Management Entity (MME) and Serving Gateway (SGW) are unchanged. MME also plays a vital part in handover signaling between LTE and 2G/3G networks. A Ue connects to a FAP (or, more correctly, to a Home eNodeB / HeNB in LTE)just as it does to any other eNB. LTE air interface is based on Orthogonal Frequency Division Multiple Access (OFDMA) for the downlink path and Single-Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink path as shown in Figure 3. If the checks are successful, the MME creates a context for the UE. The handover procedure for Intra-LTE handover using the S1 interface is very similar to that of Intra-LTE Handover Using the X2 Interface, except the involvement of the MME in relaying the handover signaling between the S-eNB and T-eNB. Protocol Signaling Procedures in LTE | Radisys White Paper 4 Random Access Procedure— System Access The UE can utilize the services of the network once it is synchronized in both the downlink as well as the uplink direction. * The UE moves between both eNBs, it reports measures to the serving eNB and * the 'source' (serving) eNB triggers the handover of the UE towards * the 'target' eNB when it considers it is a better eNB. Most important QoS parameter is QCI; at top level it tells the kind of service that can be supported by the bearer and at implementation level, it maps to measurable values of so called "standardised QCI characteristics". Official Document FCM. Intra-LTE (Intra-MME / SGW) Handover Using the X2 Interface: This procedure is used to handover a UE from a source eNodeB (S-eNB) to a target eNodeB (T-eNB) using the X2 interface when the Mobility Management Entity (MME) and Serving Gateway (SGW) are unchanged. • Trace of active UEs, and location reporting. Once the UE is successfully attached, the UE can request the MME to set up connections to additional PDNs. In this option, LTE is used as the control plane anchor for NR, and both LTE and NR are used for user data traffic. The MAPS™ X2-AP test tool is designed with specific test cases, as per LTE 3GPP mobile standards. If the checks are successful, the MME creates a context for the UE. RLF handover provides a recovery mechanism when. EMM context in MME holds no valid location or routing information for the UE. The USIM also supports various security related features that help UE to connect to LTE networks. LTE UE (User Equipment) Category & Class Definitions. LTE Protocol Stack Layers - Let's have a close look at all the layers available in E-UTRAN Protocol Stack which we have seen in previous chapter. The procedures for the Non Access Stratum, especially power management procedures are substantially similar to UMTS. If due to regional restrictions the UE is not allowed in the TA, or if subscription checking fails, the MME rejects the Attach Request with an appropriate cause. All the requirements and capabilities. at least one active PDN connection. UE context modification in LTE The UE context modification modify the established UE Context partly at EnodeB (e. 7 context in the UE. For Non-GBR bearers, per UE and per PDN/APN specific aggregate bit rate parameters apply as shown above. RRC Connection Releaseで呼解放した後、再度UEを接続できない 8 MME software process may stop unexpectedly. My doubt is in LTE, when UE is in RRC Connected State, how network will notify to. UE States and State Transition. In LTE architecture, the circuit switched (CS) fallback in EPS enables the provisioning of voice and traditional CS-domain services (e. Figure 14 (2)), the UE is almost continuously active, and P Σ converges towards a maximum, which contingents on the context‐dependent values of p i as well as the device parameters for the specific LTE frequency band. User plane entity (UPE): Manages and stores UE context, DL UP termination in LTE_IDLE, ciphering, mobility anchor, packet routing and forwarding, initiation of paging. 0 July 12, 2011 LTE Call Flows Main purpose of this document is to discuss LTE basic call flows. If the UE is not known in the old MME/old S4 SGSN or if the integrity check for the TAU request message fails, the old MME/old S4 SGSN responds with an. , it has a valid UE context. If the UE context is not present anywhere in the network (in old or new MME) and the Attach Request was Get LTE for Public Safety now with O’Reilly online learning. It talks about LTE NAS Security during Inter RAT scenarios. 1: See source(s) of contained IEs: UE-Radio-Capability: 0. UE Testing: You are feeding an unknown base station signal into a UE receiver and want to check the content eNB or UE: • You have a low level interoperability problem • You need to find out why throughput results are not as high as you expected or: You need to understand the structure of the signals & operation of the LTE radio system. UE can ask for dedicated bearers by sending out bearer modification command but UE cannot send create bearer request. LTE Network Architecture The LTE network is broadly comprised of the following three components: the cellular device (also known as user equipment or UE), the radio access network (or, (E-UTRAN), and the core network or Evolved Packet Core (EPC). One or more TCP Retransmissions for same TCP-Packet but no ACK from TCP-client, then UE performs sudden GPRS ATTACH due to Switch-off-on, PDP Context Activation and “normal” download resumes; Failure and Drops in LTE. 2018 11:18:24 Rohde & Schwarz White paper | LTE mobile network optimization - a definitive guide 3 It is important to understand that regardless of the domain (radio or core) and technology,. It is present in UE and eNodeB. Failure in the Radio Interface Procedure: Radio interface procedure has failed. When a UE is powered ON it will be in the RRC IDLE state until the RRC connection is established. Selama proses HO, jumlah HO yang sukses diukur pada souce cell. UE는 Attach Request 메시지에서 암호화 옵션 전송 플래그를 설정 한 경우 PCO 또는 APN 또는 두 가지 모두 UE로 부터 검색한다. You will discover why mobile telephone service providers are upgrading their 2nd and 3nd generation digital mobile to a more efficient and feature rich UMTS LTE generation system. The following signaling is covered: UE Attach, authentication and security signaling; Setup of two EPS Bearers (RAB id 5 and 6) Release of UE context due to inactivity; Reestablishment of the UE context with a Service Request. It is responsible for idle mode UE (User Equipment) paging and tagging procedure including retransmissions. This registration is known as the network attachment. Removing the assertion causing the crash 2. Upon receiving the detach request from the UE(1), the MME releases the EPS bearer context towards the S/PGW(2) and in turn, the bearer binding and the session binding is released over Gx and Rx(3,4). Setup, modification, and release of measurements for intra-LTE intra-frequency, intra-LTE inter-frequency, inter-RAT mobility, transport channel quality, UE internal measurement reports to indicate, for example, current power consumption and GPS positioning reports sent by the handset. Students analyze LTE signaling messages through UE logs and map them to success and failure events. The technology can reach downlink peak rates of 100Mbps and uplink speeds of 50Mbit/s, using variable bandwidth from 20Mhz down to 1. The second major KPI for LTE is the LTE ERAB Success Rate which is also part of the accessibility. This procedure is used to establish UE context at WT. 747 Enhanced CRS and 4Rx SU-MIMO Interference Mitigation Performance Requirements for LTE. The eNodeB detects inactivity and requests the release of the UE context. The call flow will help you to get the basic understanding of the initial attach procedure of the UE, authentication and default bearer creation which ultimately helps in the DL/UL data transfer. When a UE is powered ON it will be in the RRC IDLE state until the RRC connection is established. This protocol works along with other L2 protocols RLC (Radio Link Control) and MAC (Medium Access Control). To facilitate UE coexistence, a 1 MHz guard and an additional in-band blocking requirements were introduced to protect Band 12 DL. The device or UE needs to let the core network(s) know that it is switched on and active. Its basis stands in the GSM/EDGE and UMTS/HSPA network technologies, with changes in terms of an increased capacity and higher speed by simplifying the core network and using a different radio interface. [email protected] User plane entity (UPE): Manages and stores UE context, DL UP termination in LTE_IDLE, ciphering, mobility anchor, packet routing and forwarding, initiation of paging. Initiated by network in response to PDN connectivity request from UE. In LTE, when UE wish to establish RRC connection with eNB, it transmits a Random Access Preamble, eNB estimates the transmission timing of the terminal based on this. Considering the limited energy nature of User Equipment (UE), connecting to the RN instead of Evolved Node B (eNB) is a better choice for cell-edge UE items. There are two types of EPS bearers: default and dedicated. Figure 14 (2)), the UE is almost continuously active, and P Σ converges towards a maximum, which contingents on the context‐dependent values of p i as well as the device parameters for the specific LTE frequency band. This EMM cause is sent to the UE either if the network has implicitly detached the UE, e. Intra-LTE Handover Call Flow Description UE is in connected state and a data call is up. Additional PDP Contexts or Sessions (with different QoSs than default bearers) are called "dedicated bearers". An EPS Bearer should be created between the UE and the PGW. Default EPS Bearer Context activation Procedure is an ESM procedure initiated by network. pptx), PDF File (. My doubt is in LTE, when UE is in RRC Connected State, how network will notify to. 423 (LTE X2) specifications. LTE cell supports a PLMN that the UE is allowed to use (naturally, your operator), and the UE will continue on to check the cell barred status. The handover procedure for Intra-LTE handover using the S1 interface is very similar to that of Intra-LTE Handover Using the X2 Interface, except the involvement of the MME in relaying the handover signaling between the S-eNB and T-eNB. LTE does not have an N300 parameter and the RRC Connection Request message is sent only once per establishment procedure. This measurement appears typing S-eNodeB received a UE context release message from the target eNode B (T-eNodeB), or the UE context release command from the MME, which shows that the UE-eNodeB T has successfully attach at the T-eNodeB. What is KPI | What are LTE KPIs, key performance indicators. The procedures for the Non Access Stratum, especially power management procedures are substantially similar to UMTS. Supports LTE Control plane. The USIM also supports various security related features that help UE to connect to LTE networks. Handheld devices are growing exponentially and thus the need for the services on the move has increased tremendously. Additional PDP Contexts or Sessions (with different QoSs than default bearers) are called "dedicated bearers". To reduce E-UTRAN overhead and processing for a UE that is registered on the MME in order to save UE battery power, UE-related information can be released after a long period of data inactivity in which case the MME would retain the UE context and established bearer information during these idle periods. com RRC IE - UE Capability Info In most of communication protocol, the parties participating in the communication exchange the information about its capability so that the each party does not request any capability which is not supported by its counter part. LTE D Discovery LTE Direct Communication follows from context setup via Network. A partial native EPS security context is established in the UE and the network when an EPS authentication is successfully performed. The eNodeB initiates the release of the UE context if the data service has been inactive for some time. The following signaling is covered: UE Attach, authentication and security signaling; Setup of two EPS Bearers (RAB id 5 and 6) Release of UE context due to inactivity; Reestablishment of the UE context with a Service Request. LTE_mobile_optimization-a_definitive_guide_wp_en_5216-2018-52_v0100. , a global leader in telecom test and measurement solutions, addressed the press regarding their MAPS™ LTE Conformance. RLF handover provides a recovery mechanism when. EPS introduces an E2E QoS model based on the EPS Bearer, which replaces the PDP Context of GPRS. Pengukuran ini muncul ketikan S-eNodeB menerima pesan UE context release dari target eNode B (T-eNodeB), atau UE context release command dari MME, yang menunjukan bahwa UE T-eNodeB telah sukses attach di T-eNodeB. RRC Re-establish RLF DETECT. The MME sends the eNB a UE Context Release Command message to release the UE context stored at the eNB. With this approach, the UE only transmits LTE uplink in the UL subframes defined by the reference configuration while NR can be transmitted in other subframes. Additional PDP Contexts or Sessions (with different QoSs than default bearers) are called "dedicated bearers". Lte call flow 1. The above figure shows the overall sequence of how the UE and the network releases related resources when the UE detaches. NB-IoT (also called Cat-M2) has a similar goal to Cat-M, but it uses a different technology (DSSS modulation vs. In order for the UE to be able to send and receive data to and from the PDN, an EPS Bearer should exist between the UE and the PGW. In the context of the LTE toolbox, a resource grid is just a MATLAB matrix and let just call it G1 (for UE1). The new MME shall ignore the UE Core Network Capability contained in the Context Response only when it has previously received an UE Core Network Capability in the Tracking Area Update Request. equipment (UE) and the various network elements to provide the handover services requested by the UE. The Long Term Evolution Standard (LTE) is a wireless communications, high-speed data standard for mobile phones and data terminals. User plane entity (UPE): Manages and stores UE context, DL UP termination in LTE_IDLE, ciphering, mobility anchor, packet routing and forwarding, initiation of paging - The UPE terminates, for idle-state UEs, the downlink data path and initiates paging when downlink data arrives for the UE. If the UE needs to have multiple data sessions, due to various Quality of Service (QoS), the UE will do a Secondary PDP Context activation. The MME then confirms all the UE contexts have been deleted. This causes a crash. Manages and stores UE context (parameters of the IP bearer service, network's internal routing information) Performs replication of the user traffic in case of lawful. When UE moves from 3G to 4G, UE sends GUTI information mapped from P-TMSI as part of TAU request (old GUTI). LTE Call Flows ATT Best Practices: LTE Performance & Optimization Rethink Possible Fraz. XMind is the most professional and popular mind mapping tool. LTE S1-AP RESET Procedure Purpose : S1 Reset procedure used is to release the E-UTRAN or Part of E-UTRAN S1AP UE related context during event of failure at MME or eNodeB side. You will discover why mobile telephone service providers are upgrading their 2nd and 3nd generation digital mobile to a more efficient and feature rich UMTS LTE generation system. Establish and maintain IP connectivity between the UE and a packet data network gateway (PDN GW). This sequence diagram looks at LTE Attach and EPS Bearer Setup from the S1AP vantage point. Earlier in UTRAN, because of RNC, the packet transfer time was more as compared to eNodeB in LTE. To provide these services LTE reuses CS infrastructure when the UE is served by E UTRAN. User plane entity (UPE): Manages and stores UE context, DL UP termination in LTE_IDLE, ciphering, mobility anchor, packet routing and forwarding, initiation of paging. What are the key configuration components in LTE ? How LTE Optimization works. This document provides initial information related to the Verizon Wireless Long Term Evolution (LTE). EMM-Deregistered. Therefore, the performance of an LTE eNB depends on its radio resource management algorithm and its implementation. LTE Network Architecture The LTE network is broadly comprised of the following three components: the cellular device (also known as user equipment or UE), the radio access network (or, (E-UTRAN), and the core network or Evolved Packet Core (EPC). Network Access Control: MME manages authentication and authorization for the UE. This class thoroughly covers call flow through the EU-TRAN, the EPC, and into the IMS core. 747 Enhanced CRS and 4Rx SU-MIMO Interference Mitigation Performance Requirements for LTE. Control plane between UE and MME at the radio interface. In the LTE network one pair of Physical Resource Blocks (PRBs) is the smallest User Assignment Unit. 8) [MME] S1. An LTE base station receiver faces many of the same MIMO challenges, but in addition has to receive data simultaneously from multiple users. An operation method of a base station in a mobile communication network may comprise determining to disconnect a radio resource control (RRC) connection; transmitting a RRC connection release message to a terminal; releasing the RRC connection with the terminal while maintaining an S1-U bearer set up between the base station and a serving gateway (S-GW); and releasing the S1-U bearer after. LTE Physical Layer Overview. If eNB doesn't have the UE context then UE moves to RRC_IDLE state started when. The device or UE needs to let the core network(s) know that it is switched on and active. RRC Re-establish RLF DETECT. INITIAL-CONTEXT-SETUP-REQUEST Message This message is sent by the MME to request the setup of a UE context. Releasing the UE context right after sending the UE context release command 3. In mobile communication (e. Prasad NEC Corporation NIKSUN WWSMC, 26 July, 2011, Princeton, NJ, USA MI事企画M11-0043 Disclaimer: This presentation gives views/opinion of the speaker. PDP context is the message format for the understanding of GPRS support nodes for GTPv1 session establishment, updation, termination, quality of services and other specific requirements. This causes a crash. 1: See source(s) of contained IEs: UE-Security-Capabilities: 1. Upon receiving the detach request from the UE(1), the MME releases the EPS bearer context towards the S/PGW(2) and in turn, the bearer binding and the session binding is released over Gx and Rx(3,4). This procedure comes under Class 1 procedures. LTE Initial Attach Call Flow ( Part 1 ) Unknown 4G LTE No comments In this case we will look initial attach procedure of an unknown UE to a LTE network for the first time. To reduce E-UTRAN overhead and processing for a UE that is registered on the MME in order to save UE battery power, UE-related information can be released after a long period of data inactivity in which case the MME would retain the UE context and established bearer information during these idle periods. The key factors impacting CSFB call setup delay are highlighted. The access network of LTE, E-UTRAN, simply consists of a network of eNodeBs, as illustrated in Figure 3. LTE radios). In earlier article, we looked at security flow for "native" NAS security context. This EPS bearer which is first established for a new PDN connection and remains established throughout the lifetime of the. LTE Network Architecture The LTE network is broadly comprised of the following three components: the cellular device (also known as user equipment or UE), the radio access network (or, (E-UTRAN), and the core network or Evolved Packet Core (EPC). LTE Emulators v10.