728x90 Mobile163 What is base64? (base64란? / 베이스64란?) 간단히 이야기 하면, 2진 데이터를 아스키 텍스트로 변환하거나 그 반대로 변환하는 인코딩 방법입니다. MIME에 의해 사용되는 방법으로, 4개의 7비트 아스키 문자로 표현되도록 데이터를 3바이트씩 4개의 6비트 단위로 나누어 표현합니다. 메일에서 텍스트, 이미지, 오디오 파일을 보낼 때 이용하거나, SIM에서 AKA AUTH를 진행하거나, IMS 통신을 하는 경우 등 매우 다양한 곳에서 활용되는 코딩으로 모든 플랫폼에서 안보이거나 깨지는 일이 생기지 않도록 공통으로 64개 아스키 코드를 이용하여 2진 데이터를 변환하기 위해 베이스 64를 이용하는 것입니다. 따라서 베이스 64로 인코딩하면 크기가 33% 정도 커지게 됩니다. AKA AUTH에서 사용하는 예제는 아래 포스팅을 참조하시기 바랍니다.http:/.. 2015. 2. 5. ARM, 코어텍스 A72 발표 (미디어텍, 퀄컴, NVIDIA, 스프레드트럼) ARM이 2년 만에 새로운 프로세스 디자인인 "코어텍스 A72"를 발표했습니다.코어텍스 A72는 ARM v8 기반으로 설계한 고성능 프로세스 입니다. ARM은 ARM v8 아키텍처를 내놓은 이후 제품을 고성능(A), 실시간(R), 저전력(M)으로 아키텍처를 분리했는데, 코어텍스 A72는 ARM v8-A를 기반으로 만들어 진 것이라고 생각하면 될 것입니다. 우리가 잘 알고있는 스냅드래곤 810(코어텍스 A57)이나 엑시노스5등이 ARM v8-A를 이용한 AP Chip이며, 코어텍스 A72는 이를 좀 더 개선한 프로세스라고 생각하면 될 것 같습니다. 코어텍스 A72는 A15대비 3.5배의 성능을 내며, 전력 소비량도 25% 이상 줄였다고 합니다. 또한, 1초에 120프레임씩 저장(4K 영상 처리) 하는데 최.. 2015. 2. 5. ICC/UICC Power On Procedure (SIM/USIM/ISIM/CSIM) - IT3 Log 2015. 2. 4. How to operate ISIM AKA (IMS AKA)? Step 1. Decode the value of nonce by base 64nonce : EBP7NsN3GpoTmm2G1/PRA2kQAHNI/rtBAABe2iwhzwRHgQ==Decoded Data : 1013fb36c3771a9a139a6d86d7f3d1036910007348febb4100005eda2c21cf044781 Step 2. Send the value of nonce to SIM.nonce : This value is RAND + AUTN from the network.APDU : CLA(Channel ID), INS(88), P1(00), P2(81 - See. spec. 31.103 - 7.1.2), Total Length, Data (RAND Length + RAND Data + A.. 2015. 2. 4. AKA Digest authentication scheme for VoLTE (IMS) When a VoLTE client needs to connect to IMS network, it has to authenticate the network while network also needs to make sure that only the correct user is registered to its network. AKA Digest is one of the scheme to authenticate VoLTE client to the IMS server AKAAKA stands for "Authentication and key agreement". This scheme comes from the legacy 3gpp networks and has been widely used in LTE, 3.. 2015. 1. 29. [MediaTek MT6595] The world’s first octa-core 4G LTE smartphone chip with the new ARM Cortex-17 processor Designed for the ‘super-mid’ market, MediaTek MT6595 is based on the ARM® ‘big.LITTLE’ architecture, with four high-performance Cortex®-A17 and four energy efficient Cortex-A7 processors. MT6595 includes Release 9, Category 4 dual-mode LTE for worldwide 4G-network compatibility. It also features a 2560 x 1600 (WQXGA) display controller and a 20-megapixel image signal-processor for high-quality s.. 2015. 1. 6. MediaTek named Semiconductor Company of the Year at 2014 GSA Awards Tuesday, December 23, 2014 On December 11, 2014, MediaTek was named 'Outstanding Asia Pacific Semiconductor Company Award' for the third consecutive year (and for the fourth time in total) at the 20th annual Global Semiconductor Alliance (GSA) Awards Dinner. Voted by industry peers, MediaTek was recognized as the leader in the semiconductor industry, demonstrating excellence through our products.. 2015. 1. 6. Omate Racer and Roma smartwatches feature ARM7 MediaTek Aster chipset Omate has unveiled its spring-summer line of smartwatches for 2015. The new line includes the Omate Roma and Omate Racer devices. Omate claims that the new smartwatches are some of the first in the world to be powered by a new ARM7 MediaTek Aster chipset. Both of the new smartwatches are designed to push notifications from iOS and Android smartphones. The Omate Racer will hit pre-order on Januar.. 2015. 1. 6. 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. [GSM/UMTS/WCDMA] Cause codes from Network Cause No. 1 “unassigned (unallocated) number” (UMTS specific cause values for call control)This cause indicates that the destination requested by the mobile station cannot be reached because, although the number is in a valid format, it is not currently assigned (allocated). Cause value = 2 IMSI unknown in HLR (Causes related to MS identification)This cause is sent to the MS if the MS is not kno.. 2014. 10. 17. [IMS] PSTN/ISDN Emulation Architecturer AGCF (Access Gateway Control Function)- Residential 및 Access media Gateway의 첫 번째 Entity Point 2014. 10. 10. 이전 1 ··· 4 5 6 7 8 9 10 ··· 14 다음 728x90
