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Network node, wireless device, method and computer program

A technology of a network node and a wireless device, applied in the field of a wireless device and a method thereof and a computer program for implementing the method, can solve problems such as UE confusion, power consumption and computing resources, etc.

Inactive Publication Date: 2021-02-09
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, since the SSS signal occurs in various subframes with and without the presence of MIB / SIB1, it confuses the UE, where there is a risk of wasting power and computational resources in vain

Method used

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  • Network node, wireless device, method and computer program
  • Network node, wireless device, method and computer program
  • Network node, wireless device, method and computer program

Examples

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Embodiment Construction

[0071] In the following disclosure, LTE will be used as a practical example. However, the principles of the inventive contributions herein are also applicable to other systems, as will be readily understood from the following disclosure.

[0072] LTE uses Orthogonal Frequency Division Multiplexing (OFDM) in the downlink and discrete Fourier Transform (DFT) spread OFDM in the uplink (also known as Single-Carrier Frequency Division Multiple Access (SC-FDMA)). Therefore, basic LTE downlink physical resources can be viewed as figure 1 A time-frequency grid is shown, where each resource element corresponds to one OFDM subcarrier during one OFDM symbol interval. An uplink subframe has the same subcarrier spacing as the downlink, and has the same number of SC-FDMA symbols in the time domain as OFDM symbols in the downlink.

[0073]In the time domain, LTE downlink transmissions are organized into radio frames of 10 ms, each radio frame consisting of ten equally sized subframes of l...

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PUM

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Abstract

A network node for wireless access operation to a cell in a cellular network of a licensed or an unlicensed band and arranged to serve wireless devices in the unlicensed band is disclosed. The network node is arranged to transmit a discovery reference signal DRS comprising first and second synchronization signals for enabling a wireless device to find and measure cells, and wherein the DRS comprises the system when the network node operates a primary cell in an unlicensed frequency band information and additional or adapted synchronization signals for enabling the wireless device to identify the existence of system information and further acquire cell information. A wireless device for operating with such a network node is also disclosed. The wireless device is arranged to receive a transmission from a network node, determine a synchronization signal in the transmission, and determine from the synchronization signal whether the transmission is a Discovery Reference Signal DRS containing system information by identifying an additional or adapted synchronization signal in the transmission, And the system information is read according to the determined existence of the system information. Methods and computer programs for network nodes and wireless devices are also disclosed.

Description

technical field [0001] The present invention generally relates to a network node for wireless access operation to a cell in a cellular network in a licensed or unlicensed frequency band and arranged to serve a wireless device in an unlicensed frequency band, such a wireless device and its method and for A computer program for implementing the method. Background technique [0002] Cellular communication systems have traditionally used licensed frequency bands and still do. "Licensed Assisted Access" (LAA), initiated by the 3rd Generation Partnership Project (3GPP), intends to allow Long Term Evolution (LTE) devices to also operate in unlicensed radio spectrum (eg, the 5 GHz band). Unlicensed spectrum is used as a supplement to licensed spectrum. Accordingly, devices are connected in licensed spectrum (primary cell or PCell) and use carrier aggregation to benefit from additional transmission capacity in unlicensed spectrum (secondary cell or SCell). To reduce the required c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/16H04W16/14H04W74/08
CPCH04W16/14H04W48/16H04W52/0216Y02D30/70H04J11/0069H04W48/12H04J2211/005
Inventor H.韦曼P.阿力松D.苏吉夫阿拉基E.韦特恩马克
Owner TELEFON AB LM ERICSSON (PUBL)