A realization method of pdcch full-blind detection in LTE system

Abstract

The invention relates to an implementation method of PDCCH (Physical Downlink Control Channel) total blindness detection in an LTE (Long Term Evolution) system. The method comprises the following steps of detecting power of a control domain CCE (Communication Control Equipment) by UE; dividing the control domain into an occupied area and a non-occupied area; respectively carrying out total blindness detection for the two different areas; after getting PDCCH candidate sets, i.e. the start CCE position and polymerization grade of CCE of two control domains of the two different areas, respectively carrying out CRC (Cyclic Redundancy Check) and DCI (Downlink Control Information) and RNTI (Radio Network Temporary Identity) information decoding, and descrambling and checking CRC by utilizing the RNTI; analyzing to obtain all system and UE dispatch control information in each subframe; saving an RNTI value for quick decoding next time. The method is not limited by unknown RNTI, and does not rely on extra known conditions. As long as a user receives cell broadcast information, i.e. the user successfully detects the PDCCH in any format in each subframe sent to all users , decoding can be carried out any time. A decoding process only relies on a data format standard regulated by a protocol, the RNTI information of the PDCCH received in each subframe can be analyzed, and by utilizing the RNTI information, a decoding manner is optimized, and the transmission performance is improved.

Description

technical field [0001] The present invention relates to a method for realizing full-blind detection of a physical layer downlink control channel PDCCH (Physical Downlink Control Channel) in a long-term evolution LTE (Long Term Evolution) system, which is used to solve the temporary marking of an LTE user terminal UE (User Equipment) in an unknown wireless network Under the condition of RNTI (Radio Network Temporarry Indicator), the problem of performing blind detection on PDCCH to obtain resource allocation information belongs to the field of wireless communication technology. Background technique [0002] In the LTE system, a common search space (Common Search Space) and a user-specific search space (UE-Specification Search Space) of the PDCCH are defined. In the public search interval, public information related to system information, paging, power control and random access can be sent, and UE-specific information can also be sent. The corresponding downlink control inform...

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Problems solved by technology

[0024] In addition, D2D users cannot know the RNTI of existing users in the cell at the initial stage of connection establishment, and the terminal can only determine the CCE with the signal by performing power detection on the control domain signal.

However, it cannot obtain the exact starting position of the candidate CCE in the control domain and the corresponding aggregation level through calculation

[0025] In addition, at the initial stage of D2D UE connection establishment, the RNTI of the existing UE in the cell cannot be obtained, and when the determined candidate CCE is decoded, it cannot be judged by the CRC check whether it is a DCI format 0

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