Method and device for communication based on unlicensed spectrum

A technology of unlicensed spectrum and licensed spectrum, which is applied to the multiple use of transmission paths, digital transmission systems, electrical components, etc., and can solve the problem that licensed spectrum is difficult to meet the needs of business volume

Active Publication Date: 2015-12-30
SHANGHAI LANGBO COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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. needs

Method used

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  • Method and device for communication based on unlicensed spectrum
  • Method and device for communication based on unlicensed spectrum
  • Method and device for communication based on unlicensed spectrum

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0069] Embodiment 1 illustrates the flow chart of obtaining measured CSI according to the downlink RS on the unlicensed spectrum, as shown in the attached figure 1 shown. attached figure 1 , the base station N1 is the serving base station of the UEU2, and the steps S10 and S20 identified in the block F1 are optional steps.

[0070] For the base station N1, in step S11, the downlink signaling is sent to indicate that the first subframe is an uplink subframe on the first carrier, and a downlink subframe or a special subframe on the second carrier; in step S12, the second The downlink RS is sent on the carrier, and the downlink RS occupies at least one RE that cannot be used for LTECSI-RS and LTECRS in the first subframe; in step S13, the measurement CSI is received, and the reference resource for the measurement CSI includes the Downlink RS.

[0071] For UEU2, in step S21, the downlink signaling is received to determine that the first subframe is an uplink subframe on the fir...

Embodiment 2

[0079] Embodiment 2 illustrates a schematic diagram of candidate subframes of the first subframe in Embodiment 1, as shown in the attached figure 2 shown. attached figure 2 In , the first carrier deployed on the licensed spectrum adopts a TDD frame structure, where D represents a downlink subframe, U represents an uplink subframe, S represents a special subframe, and F represents a non-fixed subframe—that is, it may be an uplink or downlink subframe, The squares marked with slashes are candidate subframes of the first subframe. The second carrier is deployed on an unlicensed spectrum, and the scheduled carrier is the first carrier.

Embodiment 3

[0081]Embodiment 3 illustrates a schematic diagram of candidate REs occupied by downlink RSs in the first subframe in Embodiment 1, as shown in the attached image 3 shown. attached image 3 In , the square marked with a backslash is component 1, the square marked with a slash is component 2, and the square marked with a vertical line is component 3.

[0082] In the first subframe, REs that cannot be used for LTE CSI-RS and LTE CRS include 3 components:

[0083] - Component 1. OFDM symbols {2, 3} - squares identified by backslashes.

[0084] - Component 2. RE-slashed squares occupied by DMRS.

[0085] - Component 3. The RE in the OFDM symbol to which the DMRS belongs cannot be used for CSI-RS and DMRS - the box identified by the vertical bar.

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Abstract

The invention provides a method and a device for communication based on an unlicensed spectrum. In the first step, a base station sends a downward signaling to indicate that a first sub frame is an uplink sub frame on a first carrier and is a downlink sub frame or special sub frame on a second carrier. In the second step, a downlink RS (Reference Signal) is sent on the second carrier, and the downlink RS at least occupies one RE (Resource Element) which cannot be used in an LTE (Long Term Evolution) CSI (Channel Status Information)-RS and an LTE CRS (Cell-specific Reference Signal) in the first sub frame. In the second step, measurement CSI is received, and the reference resource of the measurement CSI includes the downlink RS. The first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the scheduling carrier of the second carrier is the first carrier. According to the scheme of the invention, a downlink sub frame which cannot be scheduled transmits a downlink RS for downlink channel measurement, and therefore, the accuracy of downlink channel measurement is improved, and communication resources are fully utilized. In addition, the configuration signaling and pattern of a CSI-RS in LTE are reused as much as possible. The method and the device have good 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 (RadioAccessNetwork, wireless access network) discussed a new research topic, that is, research on unlicensed spectrum synthesis (RP-132085), the main purpose of which is to study the non-independent ( Non-standalone) deployment, the so-called non-independent means that the communication on the unlicen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L1/00
Inventor 张晓博
Owner SHANGHAI LANGBO COMM TECH CO LTD
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