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Method and device for transmission over unlicensed spectrum

A technology of unlicensed spectrum and licensed spectrum, applied in transmission systems, digital transmission systems, multiple use of transmission paths, etc., and can solve problems such as interference with downlink RS transmission frequencies

Active Publication Date: 2015-11-25
SHANGHAI LANGBO COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For LTE unlicensed spectrum communication, if the LTE base station continues to send downlink RS (for shortening the switching time of DFS), the downlink RS is likely to interfere with signals of other systems or other operators (even if the downlink RS the sending frequency is very low)

Method used

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  • Method and device for transmission over unlicensed spectrum
  • Method and device for transmission over unlicensed spectrum
  • Method and device for transmission over unlicensed spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1 illustrates the flow chart of scheduling downlink RS on unlicensed spectrum, as shown in the attached figure 1 shown. attached figure 1 In , base station N1 is the serving base station of UEU2.

[0072] For the base station N1, in step S11, send the first signaling on the first carrier; in step S12, send the downlink RS in the first time window of the second carrier; in step S11, receive and measure CSI. For UEU2, in step S21, the first signaling is received on the first carrier; in step S22, the downlink RS is received in the first time window of the second carrier; in step S23, the CSI is fed back and measured.

[0073] In Embodiment 1, the first signaling is physical layer signaling, the first carrier is deployed in the licensed spectrum, the second carrier is deployed in the unlicensed spectrum, the first time window includes N subframes, and N is a positive integer, and the first signal The command indicates the transmission frequency band occupied ...

Embodiment 2

[0082] Embodiment 2 illustrates a schematic diagram of the first signaling, as shown in the attached figure 2 shown. attached figure 2 In , flag bits and add bits are optional and are marked with dotted lines.

[0083] For the base station, the first signaling is first sent on the first carrier; and then the downlink RS is sent in the first time window of the second carrier. For UEU2, the first signaling is first received on the first carrier; then the downlink RS is received in the first time window of the second carrier.

[0084] In Embodiment 2, the first signaling is physical layer signaling, the first carrier is deployed on a licensed spectrum, the second carrier is deployed on an unlicensed spectrum, and the first time window includes N subframes, where N is a positive integer. The first signaling includes a first index to an Lth index, where L is a positive integer. One index is used for a frequency band of an RS used for UE measurement of a carrier deployed on an u...

Embodiment 3

[0088] Embodiment 3 illustrates a schematic diagram of the transmission frequency band of the downlink RS, as shown in the attached image 3 shown. attached image 3 In the figure, the cells marked with slashes are the PRB groups occupied by the downlink RS, and the blank cells are the PRB groups not transmitting the downlink RS.

[0089] For the base station, first send the second signaling and send the first signaling on the first carrier; then send the downlink RS in the first time window of the second carrier; then receive and measure the CSI. For the UE, first receive the second signaling and receive the first signaling on the first carrier; then receive the downlink RS in the first time window of the second carrier; then feed back and measure the CSI.

[0090] In Embodiment 3, the first signaling is physical layer signaling, the first carrier is deployed in the licensed spectrum, the second carrier is deployed in the unlicensed spectrum, the first time window includes ...

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Abstract

The invention provides a method and a device for transmission over an unlicensed spectrum. In order to solve the interference problem of a downlink reference signal (RS) used for user equipment (UE) measurement and sent by a base station during the communication process over a long-term evolution (LTE) unlicensed spectrum, the invention provides a method applied to the UE. The method comprises the steps of firstly, receiving a first signaling on a first carrier; secondly, receiving a downlink RS within a first time window of a second carrier. The first signaling is in the form of a physical layer signaling and the first carrier is deployed over a licensed spectrum. The second carrier is deployed over an unlicensed spectrum. The first time window comprises N sub-frames and N is a positive integer. The first signaling indicates a transmission band occupied by the downlink RS and the transmission band is the whole part or one part of the frequency band of the second carrier. According to the technical scheme of the invention, the interference of the periodically sent downlink RS on other communication equipment over the unlicensed spectrum is avoided. Meanwhile, the requirement of the UE on fast DFS can be met at the same time. In addition, the technical scheme of the invention can be compatible with existing LTE protocols in the prior art as much as possible and is better in compatibility.

Description

technical field [0001] The present invention relates to a communication scheme using unlicensed spectrum in a wireless communication system, in particular to a communication method and device for unlicensed spectrum (Unlicensed Spectrum) based on LTE (Long Term Evolution, Long Term Evolution). Background technique [0002] In the traditional 3GPP (3rdGenerationPartnerProject, Third Generation Partnership Project) LTE system, data transmission can only occur on the licensed spectrum. However, with the rapid increase of business volume, especially in some urban areas, the licensed spectrum may be difficult to meet the business volume. demand. The 62nd plenary meeting of 3GPPRAN discussed a new research topic, that is, the research on unlicensed spectrum synthesis (RP-132085), the main purpose of which is to study the Non-standalone (non-independent) deployment of LTE on the unlicensed spectrum, the so-called Non-standalone -standalone means that the communication on the unlic...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L5/00
Inventor 张晓博
Owner SHANGHAI LANGBO COMM TECH CO LTD
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