In RR connected mode, due to lower layer failure, network releases connection using channel release procedure. Mobile indicates failure of RR connection to MM sub layer unless informed by base station.
Release of signalling links unless otherwise specified by base station. When a radio link failure is detected by mobile (UE) following actions are performed by it. RF and layer-1 failure is also referred as lower layer failure. Initiation of retransmissions and later expiry of timers after waiting for set timer value. Timers are started in the cases where response from the other entity is not available immediately.Or within the same RAT from one base station to the other. During channel assignment procedure, cell reselection procedure or handover procedure from one RAT to the other RAT.As mentioned data link layer failure as specified in 3GPP GSM specification document version 04.06.layer 1) due to various factors such as higher frequency offset, high timing offset or poor C/I conditions leading to CRC failures.ĭue to this upper layer decoding fails and both mobile and base station could not able to negotiate minimum messages required to establish the radio link connectivity. Failure at lower layer either RF or physical layer(e.g.This can happen when UE(mobile) is in the idle state or in connected state or trying to connect from idle state toįollowing are the various scenarios where in radio link failure can happen in wireless network such as GSM,CDMA or LTE. In this page we will analyze the cases of loss of communication link usually referred as radio link failure. GSM Issue-Radio link failure (radio link timeout)
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