Shenzhen Goodix Technology Co., Ltd.

Chethan Venkatesan

Thomas Fliess

Mathias Kurth

Thomas Fließ

A method for improving reliability of a narrowband physical broadcast channel (NPBCH) reception in narrowband internet-of-things (NB-IoT) user equipment (UE) during a cell acquisition phase. An object is to improve the existing NPBCH reception procedure in order to achieve a lower code-rate and hence a more reliable transmission between eNodeB and UEs will be solved thereby that the UE receives, descrambles and de-rate-matches at least a first and a second group of 64 NPBCH subframes, whereas using the four most significant bits of the system frame number as a counter and a modifier sequence {m}, which is applied to the first group of 64 NPBCH subframes, before combining the both groups, decoding and extracting the master information block from the combined NPBCH subframes and whereas the UE attaches to the cell if a match is found.

Broadcast channel reception in NB-IoT devices

The disclosure discloses a method for predictive reception of physical layer downlink repetitions in NB-IoT UE. The object of the disclosure to find a method that prolongs the battery lifetime of IoT devices will be achieved by a method for predictive reception of physical layer downlink repetitions in NB-IoT devices, the method comprising the following steps: estimating an expected number of repeated sub-frames required for a successful reception of a current encoded and in sub-frames rate-matched downlink transmission from a base station to an IoT device by applying a redundancy estimation function, using the estimated expected number of repeated sub-frames as input of a repetition reception control function, where a feedback-loop between the redundancy estimation function and the repetition reception control function is used for refining and adapting the predictive reception of physical layer downlink repetitions in NB-IoT.

Method for predictive reception of physical layer downlink repetitions in a NB-IoT UE for prolonged battery lifetime

The application relates to a method for reducing false positive detection in NB-IoT downlink control channel. The method comprises the following steps: synchronizing a UE to an eNB and exchanging a data transmission via a NPDSCH or a NPUSCH, whereas DCI pertaining to downlink or uplink data transmission is signaled to UE by eNB via NPDCCH, wherein calculating an effective code rate of NPDCCH that is used in receiving downlink grant, resulting in a value CR, calculating a scheduled code rate of NPDSCH or NPUSCH, resulting in a value CRor CR, calculating a ratio between the effective code rate CRand the scheduled code rate CRor CR, resulting in a result x, comparing the result x with pre-defined upper and lower bounds, dropping and not processing further the result x as false positive detection if the result x violates the pre-defined bounds.

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Dresden, Germany

Chethan Venkatesan