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Efficient beam searching

A beam, main beam technology, applied in the field of efficient beam search

Pending Publication Date: 2020-06-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, an important limitation is that during the application of time-reciprocity-based transmission, the position of the antenna array and the rest of the radio environment remain the same

Method used

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Examples

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Embodiment Construction

[0055] Embodiments utilize nodes (eg base stations such as gNBs) capable of tracking beams in a cell. A beam may refer to, for example, a set of antenna weights (also known as a precoding vector). In this context, tracking a particular beam may refer to receiving signal measurements (such as signal power, signal strength, SINR) related to signals (eg, reference signals) that have been transmitted using a particular precoding vector. The signal measurement may indicate the power of the signal as measured by the UE. Such signal measurements may vary due to cell geometry, eg due to beam reflection, beam diffraction and / or beam shadowing effects. A base station may be able to measure signal measurements of beams within its own cell. For example, UEs within a cell may measure Reference Signal Received Power (RSRP) and / or Reference Signal Strength Indicator (RSSI) and may report such measurements or other quality indicators to the cell's base station. The base station may also be...

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Abstract

A method for generating a probability map for a cell served by a network node is provided. The method includes generating a first probability map (P1) indicating a likelihood of primary beam directions (step 602). Generating the first probability map includes recording a first direction of a first user equipment (UE), the first direction indicating a direction of a first beam (e.g., a first set ofantenna weights (a.k.a., precoding vector)) associated with the first UE when the first UE appears in the cell served by the network node. The method further includes generating a second probabilitymap (P2) indicating a joint likelihood of primary and secondary beam directions (step 604). Generating the second probability map includes recording a second direction of a second beam associated withthe first UE when the first UE switches from the first beam to the second beam, the second direction being recorded in association with the first direction.

Description

technical field [0001] Embodiments related to beam searching are disclosed. Background technique [0002] In the emerging 5G cellular system, beamforming and MIMO transmission will be core technologies. The reason is that spectrum resources are being exhausted at low carrier frequencies, which leads to a gradual migration into higher frequency bands like millimeter wave ("mmw") bands. There, beamforming and the use of massive antenna arrays are required to achieve adequate coverage. For example, in the US and other markets, there is a large amount of spectrum available around 28GHz and 39GHz. This spectrum needs to be utilized to meet ever-increasing capacity requirements. The 5G frequency migration is expected to start at 3.5-5GHz and then continue to these 28GHz and 39GHz bands which are expected to become available in the not too distant future. [0003] In the following description, the 3GPP terminology of the 4G LTE system is used (unless otherwise specified) becaus...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08H04W64/00
CPCH04B7/0695H04B7/088H04W64/006H04W16/28H04B7/0408H04W72/046G06N7/01
Inventor T.维格伦R.米德尔顿R.德尔加多K.刘R.卡尔松
Owner TELEFON AB LM ERICSSON (PUBL)
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