Unlock instant, AI-driven research and patent intelligence for your innovation.
User equipment, and random access method
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A user device, random access technology, applied in the direction of synchronization devices, power management, electrical components, etc., can solve the problem of increased radio wave propagation loss
Pending Publication Date: 2018-10-23
NTT DOCOMO INC
View PDF14 Cites 6 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, at high frequencies, radio wave propagation loss increases, so in order to compensat
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
no. 1 Embodiment approach
[0073]
[0074] First, the first embodiment will be described. refer to Figure 5A , B, explain the basic actions in this embodiment. In addition, in the first embodiment and the second embodiment, it is assumed that the radio communication system operates by TDD, but FDD may also be used.
[0075] In this embodiment, the eNB can form multiple downlink beams. In addition, it is assumed that an index is assigned to each beam (hereinafter, a beam with an index of 1 is described as beam 1, etc.).
[0076] In addition, in this embodiment, the eNB transmits a beam selection signal through each beam, so that the UE can select an appropriate downlink beam. The beam selection signal is, for example, a synchronization signal (for example: PSS, SSS), a broadcast signal (for example: a signal sent via PBCH), system information (for example: SIB), a reference signal (for example: CRS, CSI-RS) or one of them any combination of multiples.
[0077] The beam selection signal for each b...
no. 2 Embodiment approach
[0126] Next, a second embodiment will be described. In the second embodiment, the UE transmits the RACH preamble (preamble) multiple times according to the set transmission resource pattern (pattern) without waiting for the RACH response (response). The eNB applies different reception beamforming to receive the RACH preamble (preamble) each time.
[0127] The eNB and UE may have the functions of the second embodiment in addition to the functions of the first embodiment, or may have the functions of the second embodiment instead of the functions of the first embodiment. Hereinafter, it will be described that the eNB and the UE additionally have the functions in the second embodiment in addition to the functions in the first embodiment, and which function can be switched to be used. The eNB and UE described below assume that they have the functions described in the first embodiment.
[0128] In the second embodiment, the RACH transmission mode is determined as the mode when th...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
In a wireless communication system comprising a base station and a user equipment, the user equipment, which communicates with the base station, is provided with: a storage unit which stores association information that associates identifiers of beams formed by the base station and configuration information for use in transmission of a random access signal; a selection unit which selects a specific beam on the basis of reception quality of a signal transmitted from the base station by multiple different beams, and which, on the basis of the association information, selects configuration information corresponding to said specific beam; and a transmission unit which uses the configuration information selected by the selection unit to transmit a random access signal to the base station.
Description
technical field [0001] The present invention relates to a random access procedure performed between a user equipment and a base station in a mobile communication system. Background technique [0002] 5G, the next-generation mobile communication system, aims to widen the frequency band by using higher frequencies than existing frequencies. However, at high frequencies, radio wave propagation loss increases, so in order to compensate for this, beamforming using Massive MIMO (Massive MIMO using many antennas) is being studied. [0003] Beamforming is a technique for giving directionality to a transmission (reception) beam by controlling the amplitude and phase of each signal in a plurality of (plural) transmission (reception) antennas. By narrowing the beam width, high gain can be obtained. [0004] like figure 1 As shown, a base station eNB having a Massive MIMO (Massive MIMO) function can perform beamforming with a narrow beam width, and coverage of the user equipment UE c...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More