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Method and apparatus for sending and receiving signals by use of unauthorized carrier waves

A signal-sending, unauthorized technology, applied in the field of communications, can solve problems such as difficult coordination, many wireless access sites, and a large number of users

Active Publication Date: 2015-12-16
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 5. There are many wireless access sites, the number of users is large, the collaboration is difficult, and the centralized management overhead is large
For example, there will be a variety of wireless systems in the unlicensed spectrum, which are difficult to coordinate with each other and cause serious interference

Method used

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  • Method and apparatus for sending and receiving signals by use of unauthorized carrier waves
  • Method and apparatus for sending and receiving signals by use of unauthorized carrier waves
  • Method and apparatus for sending and receiving signals by use of unauthorized carrier waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] Step 1: The base station selects a relatively idle unlicensed carrier as a candidate preemptive unlicensed carrier through a measurement or carrier selection mechanism.

[0162] If the base station has selected a preempted unlicensed carrier, the base station can notify the UE of the frequency point, bandwidth and other information of the unlicensed carrier through the licensed carrier (if the bandwidth is fixed, there is no need to notify). Because there are many unlicensed carriers available for access in the unlicensed frequency band, notifying the frequency point information of the unlicensed carriers to the subordinate UE can prevent the UE from simultaneously receiving or blindly detecting data in multiple candidate unlicensed carriers . This information can be transmitted to the UE when the RRC connection is established. Both the base station and the UE will think that the base station passes the UE's unlicensed carrier frequency point, and the UE will use it as...

Embodiment 2

[0173] The solution of Embodiment 2 is similar to that of Embodiment 1, except that in Embodiment 2, the unlicensed carrier information sent by the base station to the UE does not include the fallback time point within the contention window.

[0174] refer to figure 2 In Embodiment 2, after the base station competes for an unlicensed carrier, the signal sent to the UE also includes service data signals, such as PDSCH, and the rest of the transmitted signals are the same as in Embodiment 1. Further, the base station and the UE agree that the base station sends the PSS in the first LTEOFDM symbol and sends the SSS in the second LTEOFDM symbol after preempting the unlicensed carrier. Alternatively, an interchange method can also be used. For example, the base station and the UE agree that the base station will send the SSS in the first LTEOFDM symbol and the PSS in the second LTEOFDM symbol after preempting the unlicensed carrier. When LTEPSS / SSS is used, it will affect normal ...

Embodiment 3

[0179] In Embodiments 1 and 2, the subframes of the unlicensed carrier and the licensed carrier are aligned, and the base station discharges OFDM symbols used to send signals according to the OFDM symbol duration to the backoff time in the contention backoff window from the beginning of the next subframe. However, in Embodiment 3, after the base station competes for an unlicensed carrier, that is, when the base station arrives at a fallback time point within its own contention window, the listening carrier is always idle, and the base station directly takes this time point as the start of the subframe time, subframes are divided backwards according to the subframe duration of LTE (such as image 3 shown), and transmit signals in the divided subframes.

[0180] On the UE side, it is still necessary to blindly detect the signal sent by the base station to determine whether the base station has obtained the right to use an unlicensed carrier. Alternatively, the UE may also judge...

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Abstract

The embodiments of the invention provide a method and apparatus for sending and receiving signals by use of unauthorized carrier waves. The method comprises, after a base station preempts the right to use the unauthorized carrier waves, sending signals at residual resources and / or sub frames after the residual resources, wherein the signals comprise one or more from the following: initial symbol identification information, synchronization signals, reference signals and service data signals; and the residual resources comprise complete orthogonal frequency division multiplexing symbols which are disposed in a competition rollback window and are after the time point when the right to use the unauthorized carrier waves is obtained, or complete OFDM symbols from the time point when the base station preempts the right to use the unauthorized carrier waves until to the finishing time of the sub frames at the time point.

Description

[0001] This application is a divisional application of the application number 2014104230888 and the application date of August 25, 2014 for the invention patent application "method for transmitting and receiving signals using an unlicensed carrier, base station and user equipment". technical field [0002] The invention relates to the communication field, in particular to a method and a device for sending and receiving data using an unlicensed carrier. Background technique [0003] Up to now, it is well known that a Long Term Evolution (Long Term Evolution, LTE) system is deployed and operated on a licensed carrier. However, with the evolution of LTE, in the second half of 2013, some companies (such as Qualcomm) proposed to study the issue of deploying LTE on unlicensed carriers. But up to now, it has not been accepted and approved by LTE. [0004] The main reason given by Qualcomm is that with the rapid growth of data services, the licensed spectrum will no longer be able ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0007H04L5/0053H04L5/0091H04L5/0042H04L5/0044H04L5/001H04W74/0808H04L5/0048H04L27/0006H04W16/14H04L27/2626H04L27/2655H04L27/2666H04L27/2602H04L5/005H04W74/0816H04W72/0453H04W72/52H04L5/0005H04W24/10
Inventor 苟伟戴博赵亚军鲁照华
Owner ZTE CORP
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