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Timing advance in lbt systems

A time and duration technology, applied to electrical components, wireless communication, synchronization devices, etc., can solve problems such as reducing Wi-Fi performance

Active Publication Date: 2018-08-03
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Operating LTE in unlicensed spectrum in the same manner as licensed spectrum will severely degrade Wi-Fi performance because once Wi-Fi detects that the channel is occupied, Wi-Fi will not send

Method used

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  • Timing advance in lbt systems
  • Timing advance in lbt systems
  • Timing advance in lbt systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] Embodiment 1: A method of operation of a wireless access node in a cellular communication network, the method comprising:

[0134] • Sending (100) to the wireless device an indication of a TA for uplink LBT of the LBT cell.

Embodiment 2

[0135] Embodiment 2: The method of embodiment 1, wherein the TA for uplink LBT is configured such that at least A portion falls within a one-way propagation delay between a wireless access node providing the LBT cell and the wireless device.

Embodiment 3

[0136] Embodiment 3: The method of embodiment 1 or 2, wherein the TA for uplink LBT is configured such that the uplink LBT duration for the uplink LBT procedure performed by the wireless device at least a portion of falls within a time period whose duration is equal to the one-way propagation delay (T 1 ), the period starts at the beginning of the last downlink subframe in a downlink burst on the LBT cell.

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PUM

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Abstract

Systems and methods relating to a Timing Advance (TA) in a Listen- Before-Talk (LBT) cell are disclosed. In some embodiments, a method of operation of a radio access node in a cellular communicationsnetwork comprises transmitting an indication of a TA for uplink LBT for a LBT cell to be used by a wireless device. In this manner, timing of the uplink LBT procedure can be controlled such that at least a portion of the LBT duration occurs during a time period in which downlink transmission on the LBT cell does not interfere with the LBT procedure.

Description

[0001] related application [0002] This application claims the benefit of Provisional Patent Application Serial No. 62 / 266,386 filed December 11, 2015, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] This disclosure relates to License Assisted Access (LAA), Listen Before Talk (LBT), Multi-Carrier LBT, and MuLTEfire. The proposed changes can affect both L1 and L2. Background technique [0004] The 3rd Generation Partnership Project (3GPP) Release (Rel) 13 feature Licensed Assisted Access (LAA) allows Long Term Evolution (LTE) devices to also operate in the unlicensed 5 gigahertz (GHz) wireless spectrum. Unlicensed 5GHz spectrum is used as a supplement to licensed spectrum. A future Rel-14 work item will add uplink transmissions to the LAA. Therefore, devices connect in the licensed spectrum (Primary Cell (PCell)) and use Carrier Aggregation (CA) in order to benefit from the extra transmission capacity in the unlicensed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04W16/14H04W72/04
CPCH04W16/14H04W74/0808H04W56/0045H04W72/0446H04W72/0453
Inventor A·姆克基Y·杨
Owner TELEFON AB LM ERICSSON (PUBL)
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