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Decoding of PCFICH in LTE for power savings and range improvement

專(zhuān)利號(hào)
US10034271B2
公開(kāi)日期
2018-07-24
申請(qǐng)人
Apple Inc.(US CA Cupertino)
發(fā)明人
Tarik Tabet; Konstantinos Sarrigeorgidis; Moustafa M. Elsayed
IPC分類(lèi)
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(shuō)明書(shū)

Embodiments described herein relate to a User Equipment (UE) device, base station, and/or relay station, and associated method for improved Physical Control Format Indicator Channel (PCFICH) decoding for power saving and range improvement during wireless communications, e.g. during Long Term Evolution (LTE) communications and transmissions. In one set of embodiments, a UE may decode PCFICH as follows. The UE may obtain the Resource Elements (REs) that are reserved for Physical Downlink Control Channel (PDCCH), based on a largest value of the Control format Indicator (CFI), and may obtain the corresponding total number of Control Channel Elements (CCE), where one CCE corresponds to nine Resource Element Groups (REGs), which correspond to respective thirty six (36) Resource Elements (REs). The UE may number all CCEs, and perform PDCCH blind decoding over all these CCEs. The result may then be determined by checking the Cyclic Redundancy Check (CRC) with all possible Radio Network Temporary Identifiers (RNTIs). In this case the UE does not need to decode the PCFICH, it is decoded blindly, based on the PDCCH occupying the largest value of the CFI in subframes. If the decoding fails, then the UE may further attempt to decode with the next largest value of the CFI, i.e. the largest value of the CFI lower than the value of the CFI for which the decoding failed, and so on and so forth.

權(quán)利要求

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