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System and method for beam-based physical random-access

A random access and beam technology, applied in transmission systems, radio transmission systems, diversity/multi-antenna systems, etc., can solve complex problems and achieve the effects of improved coverage, reduced power consumption, and improved waiting time

Active Publication Date: 2017-05-31
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] Furthermore, detection of the random access preamble i.e. MSG1 is a complex problem at the network side in a beam-based radio access system, since the network node does not know which receive beam is the best to receive the preamble, and thus the network node 115 needs Repeat the search in each beam

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Embodiment Construction

[0045] The following with reference to the attached Figure 7-12 To describe specific embodiments, the same reference numerals are used for the same and corresponding parts of the various drawings.

[0046] Figure 7 A system 700 according to some embodiments is shown, the system 700 includes a wireless device 110 (in Figure 7 Shown as "terminal" in ), the wireless device 110 is operable to select the beam 704 based on the received signal strength in the downlink (DL). As shown in the figure, the system 700 includes a plurality of network nodes 115A and 115B, and each node transmits a reference signal unique to each beam. In a specific embodiment, the two network nodes 115A, 115B may be two transmission points (TP) capable of performing multi-beam transmission in the same cell (same physical cell ID), or they may be nodes belonging to different cells .

[0047] In a specific embodiment, the wireless device 110 can detect the preferred downlink beam (and ultimately the network no...

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Abstract

A method in a wireless device for performing random access to a network node. The method comprises receiving a set of downlink beam-specific reference signals, BRS, from the network node, and determining a preferred BRS based on the received signal power for each BRS. The method also comprises selecting, based on the preferred BRS, a random-access resource to be used for transmitting a random-access attempt to the network node, as well as using the selected random-access resource when transmitting a random-access attempt to the network node, whereby the selection of random-access resource indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions.

Description

Technical field [0001] Certain embodiments relate to wireless communication as a whole, and more specifically to systems and methods for beam-based physical random access. Background technique [0002] The current fourth-generation (4G) radio access within the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is based on orthogonal frequency division multiplexing (OFDM) in the downlink and Discrete Fourier Transform (DFT) spread spectrum OFDM, also known as Single Carrier Frequency Division Multiple Access (SC-FDMA). [0003] The fifth generation (5G) air interface candidate is to use a transmission duration shortened to 1 / N to scale the current LTE air interface (which is limited to a 20MHz bandwidth) by N times in the bandwidth. A typical value may be N=5, so that the carrier has a bandwidth of 100 MHz and a slot length of 0.1 millisecond. With this approach, many functions in LTE can remain the same, which will simplify standardization and allow the reuse of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/00H04W16/28H04W72/04H04B7/08H01Q3/00
CPCH04B7/0408H04B7/0617H04L5/0051H04W74/0833H04B7/086H04L5/0048H04W16/28H04W72/046H04W74/002
Inventor M·弗伦内张强H·萨林S·帕克瓦尔J·福鲁斯科格H·安德森
Owner TELEFON AB LM ERICSSON (PUBL)
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