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Decoding of PCFICH in LTE for power savings and range improvement

專利號
US10034271B2
公開日期
2018-07-24
申請人
Apple Inc.(US CA Cupertino)
發(fā)明人
Tarik Tabet; Konstantinos Sarrigeorgidis; Moustafa M. Elsayed
IPC分類
H04W72/04; H04L5/00; H04B17/336
技術(shù)領(lǐng)域
pcfich,ue,cfi,pdcch,decoding,nw,may,cces,wireless,in
地域: CA CA Cupertino

摘要

A mobile device (UE) may decode the Physical Control Format Indicator Channel (PCFICH) blindly, which may include obtaining resource elements (REs) that are reserved for the Physical Downlink Control Channel (PDCCH), based on a largest value of a control format indicator (CFI), finding a total number of control channel elements (CCEs) according to the obtained REs, numbering the CCEs, and decoding the PDCCH for the largest value of the CFI over the numbered CCEs. Accordingly, the UE does not need to decode the PCFICH) specifically. In some cases, the UE may indicate to the network that it is a constrained device, and the network may transmit control information using a reserved CFI value in response to the indication that the UE is a constrained device. The UE may then not decode the PCFICH, and decode the PDCCH based on the PDCCH occupying a first four OFDM symbols.

說明書

FIG. 8 shows a flowchart diagram illustrating wireless communications with improved PCFICH decoding according to one set of embodiments. An adaptive determination may be made whether to decode PCFICH normally or bypass PCFICH, based on one or more specified metrics (802). For example, because the NW transmits the PCFICH, a UE may decide when to bypass decoding PCFICH (also referred to as blind decoding PCFICH) and when to decode PCFICH normally. The one or more specified metrics may include metrics at the UE such as SINR, CQI, RSRP, and RSSI. If the decision is not to bypass decoding PCFICH (“No” branch taken at 804), then PCFICH may be decoded normally (806). If the decision is to bypass PCFICH (“Yes” branch taken at 804, for example if the SINR<0 dB), then REs that are reserved for PDCCH may be obtained, based on a largest value of the CFI (808). A total number of CCEs may then be found (or determined) according to the obtained REs (810), and the CCEs may be numbered (812). Decoding of the PDCCH is then performed for the largest value of the CFI over the numbered CCEs (814). A result of the decoding may then be determined according to a CRC check with all possible RNTIs (816).

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