http://victor8481.tistory.com/608

Uplink data transmission:For FDD, if the variable H_RNTI is not set, and for TDD:if the UE is in URA_PCH or CELL_PCH state; and UE has uplink RLC data PDU or uplink RLC control PDU on RB1 or upwards to transmit: perform cell update using the cause *"uplink data transmission"*. Paging response:if the criteria for performing cell update with the cause specified above. are not met; and if the UE in..

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..

Location Area Update : The location update procedure allows a mobile device to inform the cellular network, whenever it moves from one location area to the next. Mobiles are responsible for detecting location area codes. When a mobile finds that the location area code is different from its last update, it performs another update by sending to the network, a location update request, together with..

F-DPCH (Fractional Dedicated Physical CHannel) was first defined in 3GPP rel6 and then further enhanced in rel7 to overcome some soft handover limitations. Once HSDPA is used for the transfer of user data and L3 signalling (RRC & NAS) it allows the multiplexing of up to 10 users on a single SF 256 code for the purposes of sending TPC (Transmit Power Control) commands in the downlink. As shown in..

이동통신 3사 사업자들이 LTE-A 광고를 하며서 피를 튀기고 있습니다.제대로 된 서비스를 지원하지도 않으면서, 앞서 광고로 이미지 싸움을 하고 있는 것입니다.2011~2012년 부터 국내의 모든 이동통신망 사업자는 전국적으로 LTE 망 구축을 하였고, 이를 전국 방방곡곡까지 LTE가 되도록 서비스 확장에 힘을 쓰고 있습니다.그러면서 특정 지역에 LTE-A 서비스를 구축 후 실시 하였고, 지금은 이를 앞다투어 홍보하고 있는 것입니다. LTE를 알기 이전에, 우리가 지금까지 사용해 왔던, 그리고 지금도 사용하고 있는 3G를 이해해야 LTE를 이해가능 할 것 같습니다. UMTS 소개UMTS란 우리가 흔히 말해왔던 3G를 이야기 합니다.그럼 3G란? 3GPP(3rd Generation Partnership P..