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Method and base station for transmitting and receiving signals by using unauthorized carrier waves and user equipment

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

Active Publication Date: 2015-01-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 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 base station for transmitting and receiving signals by using unauthorized carrier waves and user equipment
  • Method and base station for transmitting and receiving signals by using unauthorized carrier waves and user equipment
  • Method and base station for transmitting and receiving signals by using unauthorized carrier waves and user equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0236] Step 1: The base station selects a relatively idle unlicensed carrier as a candidate preemptive unlicensed carrier through a measurement or carrier selection mechanism.

[0237] 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

[0248] 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.

[0249] 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 will send the PSS in the first LTE OFDM symbol and send the SSS in the second LTE OFDM symbol after preempting the unlicensed carrier. Alternatively, an exchange 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 LTE OFDM symbol and the PSS in the second LTE OFDM symbol after preempting the unlicensed carrier. When LTE PSS / SSS is supported, it will affe...

Embodiment 3

[0254] 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.

[0255] 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 embodiment of the invention provides a method and base station for transmitting and receiving signals by using unauthorized carrier waves and user equipment. The method includes the steps that the base station transmits unauthorized carrier wave information to the user equipment (UE) through authorized carrier waves; after obtaining the use right to the unauthorized carrier waves through competition in a competition backspacing window, the base station uses residual resources and / or subframes behind the residual resources in the competition backspacing window for transmitting the signals to the UE, and the residual resources comprise complete orthogonal frequency-division multiplexing (OFDM) symbols after the moment point of obtaining the use right of the unauthorized carrier waves through competition and located in the competition backspacing window, or complete PFDM symbols between the moment point of obtaining the use right of the unauthorized carrier waves for the base station through competition and the moment when the subframe where the moment point is located is finished.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method for sending and receiving data using an unlicensed carrier, a base station and user equipment. Background technique [0002] 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. [0003] The main reason given by Qualcomm is that with the rapid growth of data services, the licensed spectrum will no longer be able to bear such a huge amount of data in the near future. Therefore, it is recommended to consider deploying LTE in the unlicensed spectrum, and share the data traffic in the licensed carrier through the unlicensed spectrum. [0004] Unlicensed spectrum ha...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L5/00
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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