Invention Grant
- Patent Title: Downlink out of sync detection in continuous packet connectivity
- Patent Title (中): 在连续分组连接中下行链路不同步检测
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Application No.: US11865371Application Date: 2007-10-01
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Publication No.: US08160075B2Publication Date: 2012-04-17
- Inventor: Muhammad Ali Kazmi , Rong Hu , Johan Mikael Bergman
- Applicant: Muhammad Ali Kazmi , Rong Hu , Johan Mikael Bergman
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee Address: SE Stockholm
- Agency: Coats & Bennett, P.L.L.C.
- Main IPC: H04L12/28
- IPC: H04L12/28

Abstract:
Although described herein in terms of UE out-of-sync detection, those of skill in the art will readily recognize that embodiments of the present invention improve in-sync detection for currently out-of-sync UEs 22. That is, if an out-of-sync UE 22 detects sufficiently good channel conditions, it may announce this fact to the network and re-acquire in-sync status. For example, if the UE 22 receives F-DPCH signal transmissions and determines that, e.g., the TPC command error rate is less than a threshold, which is preferably much lower than 30%, over a measurement interval of, e.g., 240 slots (or 160 ms), the UE 22 may conclude that it is in-sync and announce this fact to the network 10. The restrictions of only valid F-DPCH transmissions during the UL DTX gated period will obviously enhance the reliability of this determination, just as is the case in determining out-of-sync status. Furthermore, according to at least one embodiment, the UE 22 may disregard the DTX UL DPCCH state, and transmit a scheduling request during a UL DTX gated period to announce to the network 10 its in-sync status.
Public/Granted literature
- US20090086682A1 Downlink Out of Sync Detection in Continuous Packet Connectivity Public/Granted day:2009-04-02
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