Here i write about Radio Link Control -RLC in LTE in a simple word. The RLC layer is located between the PDCP ( the “top” layer) layer and MAC layer (the “lower” layer). Communicates with the PDCP layer through a service access point ( SAP ) , and the MAC layer via logical channels. The … Read more
Here i write very small notes about How Seamless Handover in LTE which is very basic and some require techniques for real time data handover in LTE. Seamless handover is applied for user plane radio bearers mapped on RLC unacknowledged mode. These types are usually quite tolerant of losses, but less tolerant of delay (e.g. … Read more
Implement security through encryption (both control plane (RRC) data and user plane data) and integrity protection (for control plane (RRC) data only), it is the responsibility PDCP layer. A PDCP Data PDU counter (known as the “COUNT” into the specifications of LTE) is used as an input to algorithms security. value COUNT is incremented for … Read more
One of the main functions of the PDCP header compression is using Header Compression (ROHC) robust protocol defined by IETF (Internet Engineering Task Force) . In LTE, header compression is very important because there is no support for transport of voice circuit-switched (CS) domain. Thus in order to provide voice services (PS ) domain Packet … Read more
LTE Layer 2 user plane protocol stack in detail LTE user Layer 2 Protocol stack-the plan is composed of three substrates, as shown in the figure. Packet layer packet data convergence Protocol (PDCP) : this layer processes messages resource control (RRC) in the control plan and packages of Internet Protocol (IP) addresses in the user’s … Read more
PDCP layer performs the following functions: 1. Header compression and decompression plane of the user data; 2. Security features: encryption and deciphering the user plane and control plane data; the protection of the integrity and operation of the plane data; 3. Provide support functions: order to delivery and reorder PDU to the layer above a … Read more
To receive E-UTRAN pagination, UEs in idle mode for monitoring PDCCH for the channel value used to indicate the pagination RNTI: RNTI-P. The EU needs only to monitor the PDCCH channel at certain specific times (i.e. the subframes are specified for individual radio frames introduction to the framework structure of the LTE radio.). At other … Read more
The UE carried out a restriction of access check during connection establishment. This function provides a means of controlling traffic load from the EU. There are separate facilities for control of Mobile originated (MO) calls and signaling. On top of regular class, parental control, specific Access Control Services (SSAC) can be applied. SSAC facilitates separate … Read more
Closed Subscriber Group LTE supports the existence of cells which are only available for a limited set of EEC- A closed Subscriber Group (CSG). In order to prevent attempts to register on the UES CSG cells on which they do not have access to, up to the CSG supports white list, that is, a list … Read more
UE Accessibility Verification If the best cell on the LTE frequency have banned or are protected, up to exclude This cell from cell selection list. In that case may consider UE the cell on the same frequency, if banned cell indicates (by using fields ‘ intraFreqReselection ‘ in SIB1), intra-frequency selection is not allowed for … Read more