Mobile/LTE and 5G56 3GPP LTE Frequency Bands (LTE FDD / LTE TDD) LTE BandUplink Operating BandDownlink Operating BandDuplex ModeF(UL) Low – F(UL) HighF(DL) Low – F(DL) High11920 MHz – 1980 MHz2110 MHz – 2170 MHzFDD21850 MHz – 1910 MHz1930 MHz – 1990 MHzFDD31710 MHz – 1785 MHz1805 MHz – 1880 MHzFDD41710 MHz – 1755 MHz2110 MHz – 2155 MHzFDD5824 MHz – 849 MHz869 MHz – 894 MHzFDD6830 MHz – 840 MHz875 MHz – 885 MHzFDD72500 MHz – 2570 MHz2620 MHz – 2690 MHzFDD8880 .. 2015. 4. 27. 3GPP releases summary Release 8 - LTE Introduced Release frozen in Dec 2008 It was 3GPP release 8 when LTE was introduced for the very first time. All the releases following only enhanced the technology. Based on release 8 standardization, following were the main achievementsHigh peak data rates : Up to 300 Mbps in downlink and 75 Mbps in uplink when using 4x4 MIMO and 20 MHz bandwidth, High spectral efficiency Flexi.. 2015. 4. 27. [LTE] RAN Information Management (RIM) Enhanced RRC release with redirect, automatic system info exchange with RIM (GSM & WCDMA)The standardized RIM procedures allow the transfer of SI from GSM or WCDMA to LTE. This requires additional impact on the total network. RIM needs to be rolled-out in the source and target RAN as well as for SGSN and MME. SGSN and MME will be needed to route the RIM container to the correct target node. Addi.. 2015. 3. 17. [LTE] DMCR (Deferred Measurement Control Reading) 관련 LinkLTE Architecture and FEATURES This feature avoids reading SIBs with information that can be received at another occasion. Such information is included in SIB11 and 12. The SIB 11 includes measurement control and neighbouring cell list. As soon as a call is setup in Ericsson WCDMA, intra frequency measurements are started and the information in SIB11 information is retransmitted to the UE... 2015. 3. 17. LTE Architecture and FEATURES RefererenceEricson Document on Google Standard Reference› 3GPP TS 23.272, Circuit Switched Fallback in Evolved Packet System › 3GPP TS 48.018, GPRS; BSS - SGSN; BSS GPRS protocol (BSSGP) –Chapter 8c, Signaling procedures between RIM SAP’s–› 3GPP TS 25.331, Radio Resource Control –Chapter 8.1.1.6 Deferred Measurements–› 3GPP TS 23.401, GPRS enhancements for E-UTRAN access –Chapter 5.5.2.1 E-UTRAN.. 2015. 3. 17. Signaling load in LTE as compared to 3G networks "Always-On" connectivity of applications in Smartphone is causing many problems in 3G networks world wide. Many smartphone applications (Facebook, email, Skype to name a few) are always running in the background and constantly sending updates and keep-alive packets to servers in the internet. Every time a smartphone application sends a keep-alive packet, radio resources from the network are take.. 2015. 2. 17. Test Equipment - LTE RF Anritsu - MT8820 The Radio Communication Analyzer MT8820C platform covers 30 MHz to 2.7 GHz (3.4 GHz to 3.8 GHz valid only if MT8820C–018 is installed). Installing optional software and hardware supports evaluation of key TRx characteristics for LTE–Advanced FDD ⁄ TDD DL CA, LTE FDD ⁄ TDD, W–CDMA ⁄ HSPA ⁄ HSPA Evolution ⁄ DC–HSPA ⁄ 4C–HSDPA, CDMA2000 1X ⁄ 1xEV–DO, TD–SCDMA ⁄ TD–HSPA ⁄ TD–HSDPA E.. 2014. 12. 18. Test Equipment - LTE Protocol Anritsu - MD8430 This is LTE Network Simulator with which you can test LTE UE. This is the most powerful and flexible equipment that I have used. You can test almost all the detailed procedure for L1 to RRC/NAS to application. It even support baseband I/Q interface so that you can test UE even when only baseband part is implemented and RF part is not implemented. It can support 2 Active Cells (b.. 2014. 12. 18. [LTE] RSSI, RSRP, RSRQ, RSCP, SINR, EC/IO RSSI (Received Signal Strength Indicatior) - 단위 dBm (절대크기) - 단말에 수신되는 모든 Power의 총 크기 - 신호 세기에 인접한 채널의 간섭, 열 잡음 포함 - 2G (GSM)에서 통신 감도의 척도가 되는 값이다. In telecommunications, Received Signal Strength Indicator (RSSI) is a measurement of the power present in a received radio signal. The RSSI of the modem is indicated by a negative dBm value. This value relates to the signal strength of the cellular sig.. 2014. 8. 12. LTE Detach Procedure for MME-initiated (Spec. 32.426 – 4.1.3) 앞 전에 http://victor8481.tistory.com/222에서 설명드린 MME Initiated Detach Triggering 요인이 발생함에 따라, MME에서 Detach Request Message를 전송하는 Case입니다. MME Side에서 Detach Triggering이 일어났을 경우, 만일 UE가 Idle 상태에 있다면, MME는 S1 Signaling 연결을 위해, Paging 을 UE로 보내고 RRC Connection을 설립합니다. 단, UE Init 과정과 차이점이 있다면, Detach Type이 Reattach required or Reattach not required 중 하나로 내려온다는 것입니다. 만일 Reattach required의 detach type이 수신이.. 2014. 4. 2. LTE Detach Procedure for UE-initiated (Spec. 23.401 – 5.3.8.2) UE에 의해 Detach Triggering이 이루어 지게 되면, Detach Request Message를 MME로 전달하게 됩니다. Detach Request Message가 MME로 전달되는 경우, GUTI / KSIASME / Detach Type 파라메터를 함께 전달하는데, GUTI는 망 접속시 MME가 할당한 ID이고, KSIASME는 현재 UE가 사용중인 KSI 값이며, Detach Type은 Switch Off에 의한 것인지 Normal detach에 의한 것 인지에 대한 것과 EPS Detach인지 Combined Detach인지 등에 대한 정보를 표시하게 됩니다. 이후 UE는 현재 사용중인 NAS Security Context와 GUTI 및 TA 정보를 저장하고, EPS bearer C.. 2014. 4. 2. LTE Detach - Connections and States before/after Detach Detach가 이루어지기 이전에는 RRC-Connected / ECM-Connected / EMM-Registered Mode에 존재하다가,UE 또는 MME에 의해서 Detach가 이루어 지게 되면,RRC-Idle / ECM-Idle / EMM-Deregistered 상태로 변경되게 됩니다. 2014. 4. 2. 이전 1 2 3 4 5 다음
