CN105991497B

CN105991497B - Data transmission method and station

Info

Publication number: CN105991497B
Application number: CN201510052329.7A
Authority: CN
Inventors: 苟伟; 赵亚军; 彭佛才; 戴博
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-01-30
Filing date: 2015-01-30
Publication date: 2020-01-17
Anticipated expiration: 2035-01-30
Also published as: WO2016119684A1; CN105991497A

Abstract

The invention provides a data transmission method and a site. Relates to the field of wireless communications; the problem of utilizing other resources except the resources corresponding to the CCA duration is solved. The method comprises the following steps: and after the CCA/eCCA execution in the subframe is successful, the station sends the PSS and/or the SSS in the complete LTE OFDM symbol of the occupied subframe resource. The technical scheme provided by the invention is suitable for an LTE system, and realizes the utilization of the residual resources after the execution of CCA/eCCA.

Description

Data transmission method and station

Technical Field

The present invention relates to the field of mobile wireless communications, and in particular, to a data transmission method and station in an unlicensed carrier system.

Background

In the evolution process of LTE, in 9 months 2014, LTE Rel-13 release started a project research, wherein an important project in Rel-13 is that the LTE system works with an unlicensed carrier. The technology enables the LTE system to use the existing unlicensed carrier, greatly improves the potential spectrum resources of the LTE system, and enables the LTE system to obtain lower spectrum cost.

In addition, there are many advantages to unlicensed spectrum:

1. free/low cost (no need to buy non-spectrum, zero cost of spectrum resources).

2. The admission requirement is low, the cost is low (individuals and enterprises can participate in deployment, and the equipment of equipment suppliers can be arbitrary).

3. The resources are shared (when a plurality of different systems operate therein or different operators of the same system operate therein, some ways of sharing the resources may be considered to improve the spectrum efficiency).

4. The wireless access technologies are multiple (different communication standards are crossed, the cooperation is difficult, and the network topology is various).

5. The wireless access stations are many (the number of users is large, the cooperation difficulty is large, and the centralized management overhead is large).

6. Applications are numerous (from the material, multiple services are mentioned that may operate therein, e.g., Machine to Machine (M2M), Vehicle to Vehicle (V2V)).

There are some regional or national regulatory requirements for unlicensed carriers, for example in europe, where the system needs to support LBT mechanisms when operating in unlicensed carriers. For example, a station (generally referred to as a device using an unlicensed carrier in this application, including a base station, a UE, etc.) needs to perform a Clear Channel Assessment (CCA) for a carrier before using the unlicensed carrier, and if the CCA results in that the carrier is idle, the station may use the CCA. Further, when multiple neighboring stations perform CCA on the same carrier at the same time, if the CCA result is idle, these neighboring stations will use the unlicensed carrier at the same time, and there may be large interference between them. In the regulation of unlicensed carriers in a region, an extended cca (ecca) is further introduced for different preemption usage mechanisms.

For the characteristics of the LTE system, for example, LTE schedules data transmission based on a subframe unit, where one subframe has a duration of 1ms and includes 14 OFDM symbols (in the case of a normal CP), a CCA mechanism is introduced in the LTE system. Some of the disclosed resources propose that the CCA is performed at the beginning of the subframe, or the CCA lasts from the beginning of the subframe to the back, and how long the CCA lasts, the CCA and the eCCA are performed randomly. How a station utilizes other resources (except for the resource corresponding to the CCA duration) in such a subframe and how a signal in the resource is transmitted is a problem to be solved by the present invention.

Disclosure of Invention

The invention provides a data transmission method and a station, which solve the problem of using other resources except for the resources corresponding to the CCA duration.

A method of data transmission, comprising:

after a station successfully performs CCA/eCCA in a subframe, the station transmits a Primary Synchronization Signal (PSS) and/or a Secondary Synchronization Signal (SSS) in a complete LTE Orthogonal Frequency Division Multiplexing (OFDM) symbol of occupied subframe resources.

Preferably, the station sends the PSS and/or the SSS in a complete LTE OFDM symbol of an occupied subframe resource, specifically, the station preferentially selects a remaining complete LTE OFDM symbol in a subframe where the CCA/eCCA is located to send the PSS and/or the SSS.

Preferably, the sending, by the station, the PSS and/or SSS in a complete LTE symbol of the occupied subframe resource specifically includes:

when the remaining part of the subframe of the CCA/eCCA can be divided into 2 or more than 2 complete LTE OFDM symbols, the station selects 2 complete LTE OFDM symbols to transmit PSS and/or SSS after the CCA/eCCA is successfully performed.

Preferably, the station sends the SSS first and then sends the PSS in the 2 complete LTE OFDM symbols.

Preferably, the station sends the PSS and then the SSS in the 2 complete LTE OFDM symbols.

Preferably, the 2 complete LTE OFDM symbols selected by the station are specifically the 1 st and 2 nd complete LTE OFDM symbols after the CCA/eCCA is successfully performed.

and when the rest part of the subframe of the CCA/eCCA can be divided into 1 complete LTE OFDM symbol, the station transmits PSS or SSS on the LTE OFDM symbol.

Preferably, the method further includes the station transmitting an unsent SSS and/or PSS in a next subframe of the CCA/eCCA subframe.

Preferably, the method further comprises:

after the CCA/eCCA is successfully executed, the station transmits a reserved signal in other LTE OFDM symbols in a subframe of the CCA/eCCA, wherein the reserved signal comprises a reference signal, and the reference signal is one or more of the following signals:

cell Reference Signals (CRS), channel state reference signals (CSI-RS), Positioning Reference Signals (PRS), Dedicated Reference Signals (DRS), demodulated reference signals (DMRS).

Preferably, the reservation signal further comprises PSS and/or SSS.

Preferably, the method further comprises:

the station transmits reference signals in the divided complete LTE OFDM symbols after CCA/eCCA execution is successful, wherein the reference signals comprise any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the CRS comprises one or more of: 1 antenna port, 2 antenna ports, 4 antenna ports;

the PRS includes one or more of: 1 PRS corresponding to 2 PBCH antenna ports and 4 PRSs corresponding to 4 PBCH antenna ports;

the DMRS, including one or more UE-specific reference signals as PDSCH;

the CSI-RS is one or more sets of CSI-RSs.

Preferably, the method further comprises:

and when the station does not transmit data in the divided complete LTE OFDM symbols, the station ensures that at least one type of reference signal is transmitted in the LTE OFDM symbols.

Preferably, the station ensures that at least one type of reference signal is transmitted in each LTE OFDM symbol, specifically:

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

the PRS are preferably PRS corresponding to 1 and 2 PBCH antenna ports, and the CRS is a CRS corresponding to 1 or 2 antenna ports.

Preferably, the method further comprises:

and when the station sends the reference signal, mapping in an LTE OFDM symbol in a subframe according to a mode specified by an LTE protocol, and when the corresponding LTE OFDM symbol is occupied by CCA/eCCA, knocking off the reference signal mapped in the LTEOFDM symbol occupied by CCA/eCCA.

Preferably, the position of the CCA/eCCA in the time direction of the subframe is fixed, and the CCA/eCCA allows starting execution in any symbol of the subframe.

Preferably, after the CCA/eCCA is successfully performed, when the remaining time in the CCA/eCCA subframe can also be divided into complete LTE OFDM symbols, the station sends the PDCCH or ePDCCH in the complete LTE OFDM symbols.

Preferably, the sending, by the station, the PSS and/or SSS in the complete LTE symbol specifically includes:

when only the PSS or the SSS exists in the complete LTE OFDM symbol, the station transmits the PSS or the SSS at the other frequency domain positions of the complete LTE OFDM symbol besides the frequency domain positions of the PSS or the SSS in the carrier according to the LTE specification, wherein the frequency domain positions of the PSS or the SSS in the carrier according to the LTE specification are positioned at the center 63 subcarriers of the carrier except the middle subcarrier.

Preferably, when the PSS or SSS transmitted by the other frequency domain locations is used, the station allocates subcarriers for the PSS or SSS in units of 63 subcarriers to the low frequency end or the high frequency end, except for 63 subcarriers in the center of the carrier, and when the PSS or SSS is transmitted in each unit, the most middle subcarrier of the unit is not used.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, when the station transmits the non-transmitted PSS or SSS using the other frequency domain locations, the station allocates subcarriers for the PSS or SSS in units of 62 subcarriers to the low frequency end/the high frequency end, except for 63 subcarriers in the center of the carrier, and when the PSS or the SSS is transmitted in each unit, the PSS or the SSS is transmitted in each subcarrier in the unit.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

and the total bandwidth occupied by the PSS or the SSS in each LTE OFDM symbol for transmitting the PSS or the SSS in the carrier is not less than 80% of the carrier bandwidth.

The invention also provides a data transmission method, which comprises the following steps:

after the CCA/eCCA execution in a subframe succeeds, when a complete LTE OFDM symbol can be further divided by the remaining time in the subframe occupied by the CCA/eCCA, a reference signal is sent in the complete LTE OFDM symbol, and the reference signal comprises any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

the DMRS, including one or more UE-specific reference signals being PDSCHs (UE-specific referenced associated with PDSCHs);

the CSI-RS is one or more sets of CSI-RSs.

Preferably, the method further comprises:

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

Preferably, the method further comprises:

Preferably, after the CCA/eCCA is successfully performed, when the time remaining in the CCA/eCCA subframe can also mark out a complete LTE OFDM symbol, the station transmits PSS and/or SSS in the complete LTE OFDM symbol.

Preferably, when the remaining part of the subframe of the CCA/eCCA can be divided into 2 or more than 2 complete LTE OFDM symbols, the station selects 2 complete LTE OFDM symbols to transmit PSS and/or SSS after the CCA/eCCA is successfully performed.

Preferably, the 2 complete LTE OFDM symbols are selected as the first and second complete LTE OFDM symbols after the CCA/eCCA is successfully performed.

Preferably, when the remaining part of the CCA/eCCA subframe can be divided into 1 OFDM symbol, the station transmits a PSS or an SSS thereon, and transmits an unsent SSS or PSS in a next subframe of the CCA/eCCA subframe.

Preferably, the method further comprises:

when the station can further divide a complete LTE OFDM symbol in the remaining time of the CCA/eCCA subframe, transmitting a reservation signal in the complete LTE OFDM symbol, wherein the reservation signal comprises a reference signal, and the reference signal is one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the reservation signal further comprises PSS and/or SSS.

Preferably, after the CCA/eCCA is successfully executed in the subframe, when the remaining time in the subframe of the CCA/eCCA can also mark out a complete LTE OFDM symbol, the station sends the PDCCH or the ePDCCH in the complete LTE OFDM symbol.

Preferably, when only PSS or SSS is transmitted in the complete LTE OFDM symbol, the station transmits PSS or SSS at other frequency domain positions of the complete LTE OFDM symbol in addition to the frequency domain position of PSS or SSS in the carrier according to LTE specifications, which are located at the center 63 subcarriers of the carrier, but excluding the middle-most subcarriers.

Preferably, when the station transmits the PSS or SSS using the other frequency domain locations, the station allocates subcarriers for the PSS or SSS in units of 63 subcarriers to the low frequency side or the high frequency side, and when the PSS or SSS is transmitted in each unit, the most middle subcarrier of the unit is not used.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, when the site transmits the PSS or the SSS using the other frequency domain locations, the site allocates subcarriers for the PSS or the SSS in units of 62 subcarriers to the low frequency end/the high frequency end, except for 63 subcarriers in the center of the carrier, and when the PSS or the SSS is transmitted in each unit, the PSS or the SSS is transmitted in each subcarrier in the unit.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises the step of,

after a station successfully performs CCA/eCCA in a subframe, when a complete LTE OFDM symbol can be further divided by the remaining time in the subframe occupied by the CCA/eCCA, a reservation signal is sent in the complete LTE OFDM symbol, wherein the reservation signal comprises a reference signal, and the reference signal comprises any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the reservation signal further comprises PSS and/or SSS.

Preferably, the transmitting the reservation signal in the complete LTE OFDM symbol includes:

Preferably, when the remaining part of the CCA/eCCA subframe can be divided into 1 complete LTE OFDM symbol, the station transmits PSS or SSS on the LTE OFDM symbol, and transmits the non-transmitted SSS and/or PSS in the next subframe of the CCA/eCCA subframe.

Preferably, when the station transmits the PSS or SSS, when only the PSS or SSS is in the complete LTE OFDM symbol, the station transmits the PSS or SSS at the other frequency domain positions of the complete LTE OFDM symbol in addition to the frequency domain position of the PSS or SSS in the carrier according to LTE specifications, which are located at the center 63 subcarriers of the carrier, except for the most middle subcarrier.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

Preferably, the transmitting the reservation signal in the complete LTE OFDM symbol further includes:

after the CCA/eCCA is successfully executed, the station transmits the reference signal in the divided complete LTE OFDM symbol, wherein the reference signal is one or more of the following signals:

CRS, CSI-RS, Positioning Reference Signals (PRS), Dedicated Reference Signals (DRS), demodulated reference signals (DMRS).

the CSI-RS is one or more sets of CSI-RSs.

Preferably, when the station does not transmit data in the divided complete LTE OFDM symbols, the station ensures that at least one type of reference signal is transmitted in each LTE OFDM symbol.

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

Preferably, the method further comprises:

The invention also provides a station comprising:

and the PSS/SSS sending module is used for sending the PSS and/or SSS in a complete LTE OFDM symbol of the occupied subframe resource after CCA/eCCA execution in the subframe is successful.

Preferably, the PSS/SSS transmitting module includes:

a first sending unit, configured to, when a remaining part of the subframe of the CCA/eCCA can be divided into 2 or more complete LTE OFDM symbols, select 2 complete LTE OFDM symbols to send PSS and/or SSS after the CCA/eCCA is successfully performed.

Preferably, the PSS/SSS transmitting module further includes:

a second sending unit, configured to send a PSS or an SSS on an LTE OFDM symbol when a remaining part of a subframe of the CCA/eCCA can be divided into 1 complete LTE OFDM symbol, and send an unsent SSS and/or PSS in a next subframe of the CCA/eCCA.

Preferably, the station further comprises:

a reserved signal transmitting module, configured to transmit a reserved signal in other LTE OFDM symbols in a subframe of a CCA/eCCA after the CCA/eCCA is successfully performed, where the reserved signal includes a reference signal, and the reference signal is one or more of:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the station further comprises:

a reference signal sending module, configured to send a reference signal in the divided complete LTE OFDM symbol, where the reference signal includes any one or any multiple of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the station further comprises:

and the PDCCH/ePDCCH sending module is used for sending the PDCCH or the ePDCCH in the complete LTE OFDM symbol when the residual time in the subframe of the CCA/eCCA can also divide the complete LTE OFDM symbol after the CCA/eCCA is successfully executed.

The invention also provides a station comprising:

a reference signal transmitting module, configured to, after a CCA/eCCA is successfully performed in a subframe, transmit a reference signal in a complete LTE OFDM symbol when a time remaining in a subframe occupied by the CCA/eCCA can also divide the complete LTE OFDM symbol, where the reference signal includes any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the station further comprises:

and the PSS/SSS sending module is used for sending the PSS and/or SSS in a complete LTE OFDM symbol when the time remained in a subframe of CCA/eCCA can also divide the complete LTE OFDM symbol after CCA/eCCA is successfully executed.

The invention also provides a station comprising:

a reserved signal sending module, configured to send a reserved signal in a complete LTE OFDM symbol when a remaining time in a subframe occupied by a CCA/eCCA can also mark the complete LTE OFDM symbol after the CCA/eCCA is successfully executed in the subframe, where the reserved signal includes a reference signal, and the reference signal includes any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the reservation signal further includes a PSS and/or a SSS, and the reservation signal transmitting module includes:

and the PSS/SSS transmitting unit is used for selecting 2 complete LTE OFDM symbols to transmit the PSS and/or SSS after CCA/eCCA execution is successful when the rest part of the subframe of the CCA/eCCA can be divided into 2 or more than 2 complete LTE OFDM symbols.

Preferably, the PSS/SSS transmitting unit is further configured to transmit the PSS or SSS on 1 complete LTE OFDM symbol when the remaining part of the CCA/eCCA subframe can be divided into the LTE OFDM symbol, and transmit the non-transmitted SSS and/or PSS in the next subframe of the CCA/eCCA subframe.

Preferably, the reservation signal sending module further includes:

and a reference signal transmitting unit, configured to transmit the reference signal in the divided complete LTE OFDM symbol after the CCA/eCCA is successfully performed.

The invention provides a data transmission method and a site, wherein the site transmits PSS and/or SSS or reference signals or reserved signals in complete LTE OFDM symbols of occupied subframe resources after CCA/eCCA execution in a subframe is successful. The utilization of the residual resources after the execution of the CCA/eCCA is realized, and the problem of utilizing other resources except the resources corresponding to the CCA duration is solved.

Drawings

Fig. 1 is a schematic diagram of a complete LTE OFDM symbol remaining after CCA/eCCA is performed;

fig. 2 is a schematic diagram of a mode of occupying the remaining LTE OFDM symbols after CCA/eCCA is performed by PSS/SSS;

fig. 3 is a schematic diagram of another way of occupying the remaining LTE OFDM symbols after CCA/eCCA is performed by PSS/SSS;

FIG. 4 is a diagram illustrating a reservation signaling scheme;

fig. 5 is a schematic diagram of another reservation signaling manner;

fig. 6 is a schematic diagram of another reservation signal transmission manner;

fig. 7 is a schematic diagram of signal mapping in a CCA/eCCA subframe;

fig. 8 is a schematic diagram of signal mapping in yet another CCA/eCCA subframe;

fig. 9 is a schematic diagram of signal mapping in yet another CCA/eCCA subframe;

fig. 10 is a schematic diagram of signal mapping in yet another CCA/eCCA subframe;

fig. 11 is a schematic diagram of signal mapping in yet another CCA/eCCA subframe;

fig. 12 is a schematic diagram of signal mapping in yet another CCA/eCCA subframe;

fig. 13 is a diagram illustrating reserved symbol transmission;

fig. 14 is a schematic structural diagram of a station according to a ninth embodiment of the present invention;

fig. 15 is a schematic structural diagram of another station according to a ninth embodiment of the present invention;

fig. 16 is a schematic structural diagram of another station according to a ninth embodiment of the present invention.

Detailed Description

For the characteristics of the LTE system, for example, LTE schedules data transmission based on a subframe unit, where one subframe has a duration of 1ms and includes 14 OFDM symbols (in the case of a normal CP), a CCA mechanism is introduced in the LTE system. Some of the disclosed resources propose that the CCA is performed at the beginning of the subframe, or the CCA lasts from the beginning of the subframe to the back, and how long the CCA lasts, the CCA and the eCCA are performed randomly. How a station utilizes other resources (except for the resource corresponding to the CCA duration) in such a subframe and how a signal in the resource is transmitted will be a problem to be solved by the embodiments of the present invention.

In order to solve the above problem, embodiments of the present invention provide a data transmission method and a station. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

An embodiment of the present invention provides a data transmission method, including:

Preferably, the method further comprises:

Preferably, the reservation signal further comprises PSS and/or SSS.

Preferably, the method further comprises:

CRS、CSI-RS、PRS、DRS、DMRS。

the DMRS, including one or more UE-specific reference signals as PDSCH;

the CSI-RS is one or more sets of CSI-RSs.

Preferably, the method further comprises:

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

The embodiment of the invention also provides a data transmission method, which comprises the following steps:

CRS、CSI-RS、PRS、DRS、DMRS。

the CSI-RS is one or more sets of CSI-RSs.

Preferably, the method further comprises:

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

Preferably, the method further comprises:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the reservation signal further comprises PSS and/or SSS.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises the step of,

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the reservation signal further comprises PSS and/or SSS.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

a space of at least one subcarrier is reserved between units.

Preferably, the method further comprises:

the CSI-RS is one or more sets of CSI-RSs.

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

Preferably, the method further comprises:

The reserved signal (also referred to as an occupied signal) can be sent in a subframe where a Clear Channel Assessment/extended Clear Channel Assessment (CCA/eCCA) is located, where the reserved signal includes remaining resources in an OFDM symbol corresponding to a CCA/eCCA success time and/or remaining OFDM symbols in the subframe where the CCA/eCCA is located, and can also be sent in other subframes where the station camps on the unlicensed carrier. The receiving end can assume that the reservation signal comprises one or more of the following signals: CRS, PRS, PSS/SSS, CSI-RS. The preferred mode includes CRS of 1 or 2 antenna ports (ports 0 and 1), PRS of 1 and 2 PBCH antenna ports (port 6), and PSS/SSS located in 2 symbols immediately after the OFDM symbol corresponding to the CCA/eCCA success time, or PSS/SSS located in 6 th and 7 th symbols (in case of LTE standard cyclic prefix) in the subframe, or PSS/SSS located in 2 symbols immediately after the OFDM symbol allocated for CCA/eCCA in the subframe.

Referring to fig. 1, when the LTE system operates in an unlicensed carrier, if a station performs CCA/eCCA, if from the start of a subframe, if eCCA/eCCA is further performed, and a random backoff mechanism is introduced, the station itself can only know which resources (remaining LTE OFDM symbols) are left in the subframe after performing CCA/eCCA successfully, and actually the resources from the start of CCA/eCCA successfully to the end of the subframe. These resources are all composed of non-complete LTE OFDM symbols and/or complete LTE OFDM symbols, wherein, if the LTE OFDM symbol range for CCA/eCCA implementation is allocated in advance, the complete LTE OFDM symbol is composed of two parts, one part is the rest of the symbols allocated to CCA/eCCA, and the other part is the symbols not allocated to CCA/eCCA.

And the station executes CCA/eCCA, and when the station successfully executes the CCA/eCCA, the station determines the residual resources in the subframe and determines the positions and the number of the residual complete LTE OFDM symbols.

Data transmission of a station is generally scheduled in sub-frame units, and the station does not transmit data in the remaining complete lte ofdm symbol (because it is very complex to transmit data in this manner, but if the station is highly functional (costly), it may also transmit data), and the station starts to transmit data in the next sub-frame, and in order to prevent other stations or systems (e.g., wifi systems) from seizing resources of an unlicensed carrier, the station needs to transmit a signal (referred to as a reserved signal or a reserved signal) in the remaining resources to occupy the unlicensed carrier, so that other stations or systems find that the unlicensed carrier is non-idle when performing CCA/eCCA, and thus the station can guarantee that the usage right of the unlicensed carrier is not lost in the next sub-frame.

The station transmits data in the remaining complete LTE OFDM symbols in the following manner.

The manner in which the PSS/SSS is transmitted is described below.

After a station successfully executes CCA/eCCA in a subframe, when determining that the remaining time resources in the subframe can also divide a complete LTE OFDM symbol and the station determines that 2 or more than 2 complete LTE OFDM symbols can be divided, the station selects 2 complete symbols to transmit PSS and/or SSS, wherein when the former of the 2 complete symbols transmits SSS, the latter transmits PSS; or when the former transmits PSS, the latter transmits SSS. The 2 symbols determined by the station are the first and second complete LTE OFDM symbols after the CCA/eCCA execution is successful. An alternative is given in figure 2.

If the station determines that the number of the divided complete LTE OFDM symbols is 1, the station transmits PSS or SSS in the symbol. Optionally, the station sends the SSS or the PSS in the first symbol of the next subframe, so that the station may send the complete PSS/SSS, so that the UE can continue to use the PSS/SSS to achieve the synchronization purpose, where the former only sends the PSS or SSS of one symbol, which may achieve the effect of reserving a signal, but the synchronization purpose is weakened.

If it is specified that the CCA/eCCA execution time range is fixed to some symbols of the subframe, for example, to the first 3 (or 4) symbols in the subframe. In this case, in addition to the aforementioned PSS/SSS symbol position determination method, it can be performed in the following manner. And the station transmits PSS and SSS in the first 2 symbols after the execution time range configured to CCA/eCCA. For example, assume that the station transmits PSS, SSS in the 4 th and 5 th symbols in the subframe as illustrated in fig. 3. In this way the symbol position of PSS/SSS is determined by the number of symbols allocated to CCA/eCCA. If the number of symbols allocated to CCA/eCCA is the first symbol, the symbol position of PSS/SSS is the same as in fig. 2, but the symbol determination is still different. The mapping within a particular symbol, which symbol transmits PSS, which symbol transmits SSS, may be done in the following manner.

Alternatively, if 2 or more LTE symbols still remain in a subframe after a station successfully performs CCA/eCCA within the subframe, the station transmits PSS or SSS in the last 2 LTE symbols of the subframe.

The mode of transmitting PSS/SSS at other positions of the frequency domain of the carrier wave is as follows:

when only PSS or SSS is in a complete LTE symbol, a station transmits PSS/SSS in other frequency domain locations of the symbol in addition to the frequency domain locations in the carrier as specified by LTE (the PSS/SSS specified by LTE is located in the 63 carriers in the center of the carrier, but in addition to the middle one subcarrier).

If the PSS/SSS is transmitted at other frequency domain positions, the station can transmit the PSS/SSS (one carrier reservation in the middle) by expanding to the low frequency end or the high frequency end after reserving a given subcarrier interval according to the unit of 63 subcarriers except the middle 63 subcarriers. For example, if there is a given interval, for example, 5 subcarriers. When a site expands the PSS/SSS to a low frequency band, the site reserves 5 subcarriers outside the subcarriers of the existing PSS/SSS, then selects new 63 subcarriers (continuous in frequency domain) to transmit the PSS/SSS, reserves one middle subcarrier without the PSS/SSS, and sequentially expands to other frequency directions. If 63 subcarriers cannot be allocated at the carrier's low or high frequency, then these carriers do not transmit PSS, SSS.

In the above description, an interval may not be reserved, for example, the interval is set to 0. The reserved interval is beneficial to reducing interference between the PSS/SSS of each unit and is beneficial to analysis of a receiving end. The interval is 0, the channel occupying effect is completely realized, the analysis difficulty is slightly increased, and in some scenes, the receiving end does not need to analyze and only needs to detect an energy signal.

The PSS/SSS is transmitted by selecting the subcarriers in other frequency domain locations according to 63 units, but it is necessary to reserve which subcarrier in the middle of each 63 carriers, so the present invention also includes selecting the subcarriers in other frequency domain locations according to 62 subcarriers as a unit to transmit the PSS/SSS, where all 62 subcarriers transmit the PSS/SSS.

Further, in order to overcome the following problem, when a 20M carrier is preempted by the station 1, if the station 1 uses the PSS/SSS in the above manner, at the non-central frequency point of the 20M, other stations may retrieve the PSS/SSS, and may assume that the central frequency point is an access central frequency point of a certain carrier (for example, a 5M carrier), so as to attempt access, and finally waste the power of the station. Further, optionally, the PSS/SSS transmitted at the non-central frequency point of the carrier should maintain one or more of the following characteristics:

1) the symbol order of the PSS and SSS is the opposite of the symbol order at the center frequency point of the existing carrier. For example, in the existing LTE FDD, the PSS/SSS are transmitted in two fixed symbols, and the symbol sequence is that the SSS symbol is transmitted first and then the PSS symbol is transmitted, then according to the scheme of the present invention, the PSS symbol and the SSS symbol should be transmitted first at other frequency domain positions.

2) The PSS or SSS takes a sequence different from the one selected in existing LTE. For example, if the selected PSS or SSS sequence set in the existing LTE is a, the PSS or SSS transmitted at other frequency domain locations selects sequences other than the a set.

3) The PSS/SSS is not transmitted in several sub-carriers at the center frequency point of each possible carrier, e.g. the center 63 sub-carriers but one sub-carrier in between. Each possible carrier is divided in advance according to the bandwidth, for example, the carrier is divided according to the numerical values of 5M, 10M, and the like, and the central frequency points of the divided carriers are uniquely determined, and the central frequency points are referred to as the central frequency points of the possible carriers.

4) In the downlink carrier, when the frequency corresponding to the subcarrier is the frequency point swept by the UE, the PSS/SSS is not sent as the central position of the PSS/SSS subcarrier. For example, when the frequency point swept by the UE is an integer multiple of 300KHz, the PSS/SSS is transmitted without using the subcarriers whose frequency is an integer multiple of 300 KHz.

When the PSS/SSS is transmitted at a non-center frequency point of an unauthorized carrier, the total transmission times or occupied bandwidth meet the following requirements: in each symbol for transmitting the PSS or SSS in the unlicensed carrier, the bandwidth occupied by transmitting the PSS or SSS is not less than 80% of the bandwidth of the carrier. 80% means that the signal energy is detectable over 80% of the full bandwidth.

The method solves the relevant problem of transmitting the PSS/SSS at other positions of the frequency domain of the carrier wave.

The above-described manner of transmitting PSS/SSS may be repeatedly implemented over all remaining complete LTE OFDM symbols.

The above manner can realize the role that the station transmits the PSS/SSS to occupy the carrier after performing CCA/eCCA in the subframe. Meanwhile, the existing PSS/SSS sending mechanism is reserved, so that the UE can use the existing synchronization mechanism conveniently. Other frequency domain extended PSS/SSS may also be used by the UE for synchronization purposes, thereby improving synchronization accuracy.

The transmission of the reference signal is described below.

After the successful CCA/eCCA execution in the subframe, the station determines that when the remaining time resources in the subframe can also divide a complete LTE OFDM symbol, the station uses the complete symbol to transmit a reference signal, and one purpose of the reference signal may be used as a reservation signal (or the reservation signal can be constructed by some (some) of the reference signals, and the reservation signal component of each time is configured by the station). These reference signals include one or more of the following: CRS, CSI-RS, PRS, DRS, DMRS, etc. Specifically, the station can select configuration transmission according to different purposes.

If the station uses the existing reference signal as a reserved signal for occupying the right to use the unlicensed carrier in the subframe, the reference signal should be: and the station enables at least one type of reference signal to be transmitted in the complete LTE OFDM symbol. Here, if the PSS and/or SSS have been transmitted in the aforementioned manner in the aforementioned full LTE OFDM symbols, the reference signals in these symbols are not subject to the aforementioned constraints. Further, in the above embodiment, it is preferable that the station does not transmit data or a reservation signal (the reservation signal is a reservation signal formed of a signal other than the reference signal) in the symbol.

For CRS, when a station is configured, it is necessary to provide antenna ports as reservation signals, including 1 antenna end, 2 antenna ports, and 4 antenna ports. When configuring the PRS site, specific pattern indications including 1 PRS corresponding to 2 PBCH antenna ports and 4 PRS corresponding to 4 PBCH antenna ports need to be given as reservation signals. For DMRS, one or more UE-specific reference signals (for demodulating PDSCH) (UE-specific reference signals associated with PDSCH); for CSI-RS, one or more sets of non-zero power configurations are included.

Some preferred combinations are as follows (but not limited thereto):

1) and the site configures CRS and PRS at the same time, and optionally configures PSS/SSS. Preferably, CRS of 1 or 2 antenna ports and PRS corresponding to 1 and 2 PBCH antenna ports are used. Such a configuration can satisfy, to the maximum possible, that there is at least one type of reference signal transmission in all the remaining complete LTE OFDM symbols. This approach is well suited for the case where CCA/ECCA starts from the start of the subframe, and for LTE systems, if the point at which a station succeeds in performing CCA/ECCA is within the first OFDM symbol, PSS and/or SSS may be transmitted in the aforementioned manner in the second and third OFDM symbols, and reference signals are transmitted in the remaining symbols according to the method of the present invention. In this embodiment, the PSS/SSS may be mapped and transmitted according to the new method, or may use the existing LTE rules to determine the symbol positions, for example, the PSS/SSS may be fixed in the 6 th symbol and the 7 th symbol in the subframe (the subframe is composed of 14 symbols, taking the subframe corresponding to the normal CP as an example), and the PSS/SSS may be fixed in the 7 th symbol and the 6 th symbol (or may be interchanged). This way, it is assumed that there are still 6 th and 7 th symbols in the complete LTE symbol in the subframe (according to the original symbol division of the subframe).

2) And the site simultaneously configures the CRS, the CSI-RS and the user data, and optionally configures the PSS/SSS, wherein the channel bandwidth occupied by the user data is not less than 80% of the carrier bandwidth. Wherein the CSI-RS comprises one or more sets. In this case, since user data is present, DMRS for demodulating the user data can be transmitted. In this embodiment, the PSS/SSS may be mapped and transmitted according to the new method, or may use the existing LTE rules to determine the symbol positions, for example, the PSS/SSS may be fixed in the 6 th symbol and the 7 th symbol in the subframe (the subframe is composed of 14 symbols, taking the subframe corresponding to the normal CP as an example), and the PSS/SSS may be fixed in the 7 th symbol and the 6 th symbol (or may be interchanged). This way, it is assumed that there are still 6 th and 7 th symbols in the complete LTE symbol in the subframe (according to the original symbol division of the subframe).

3) And the site simultaneously transmits the CRS, the CSI-RS and the PRS, and optionally configures the PSS/SSS. Preferably, CRS of 1 or 2 antenna ports and PRS corresponding to 1 and 2 PBCH antenna ports are used. Such a configuration can satisfy, to the maximum possible, that there is at least one type of reference signal transmission in all the remaining complete LTE OFDM symbols. This approach is well suited for the case where CCA/ECCA starts from the start of the subframe, and for LTE systems, if the point at which a station succeeds in performing CCA/ECCA is within the first OFDM symbol, PSS and/or SSS may be transmitted in the aforementioned manner in the second and third OFDM symbols, and reference signals are transmitted in the remaining symbols according to the method of the present invention. The CSI-RS includes one or more sets. In this embodiment, the PSS/SSS may be mapped and transmitted according to the new method, or may use the existing LTE rules to determine the symbol positions, for example, the PSS/SSS may be fixed in the 6 th symbol and the 7 th symbol in the subframe (the subframe is composed of 14 symbols, taking the subframe corresponding to the normal CP as an example), and the PSS/SSS may be fixed in the 7 th symbol and the 6 th symbol (or may be interchanged). This way, it is assumed that there are still 6 th and 7 th symbols in the complete LTE symbol in the subframe (according to the original symbol division of the subframe).

When the station does not transmit (downlink) data and a control field in a subframe of an occupied unlicensed carrier, the station also needs to transmit a signal in the subframe, a signal reservation method, for example, as shown in fig. 4, where an RS indicates that the symbol transmits a reference signal, where the reference signal may be the foregoing constituent method, and preferably, the RS at this time at least includes CRSs of 1 or 2 antenna ports and PRSs corresponding to 1 and 2 PBCH antenna ports. When a station does not transmit data but transmits a control field in the subframe, then the station may transmit one or more of the following in the first 3 symbols of the subframe: PDCCH, PHICH and PCFICH. The first symbol also transmits CRS, and the other symbols transmit reference signals in the manner described above.

The reserved signal is formed by combining the PSS/SSS and the reference signal. Preferably, the reference signals are CRS and PRS, and further CSI-RS is sent for CSI measurement or RRM measurement. In order to occupy more complete LTE OFDM symbols, CRS of 1 or 2 antenna ports and PRS corresponding to 1 and 2 PBCH antenna ports are used. Multiple sets of CSI-RS can be configured so as to improve measurement accuracy.

Since the number of remaining complete LTE OFDM symbols is not constant, a description is given for the mapping rule of the reference signal within the symbol:

the mapping rule within a subframe is the same as the existing LTE specification, and for a symbol occupied by performing CCA/eCCA, the reference signal of its mapping pattern on its symbol is dropped. For example, taking two antenna ports CRS as an example, the other reference signals are performed similarly, assuming that the station performs CCA/eCCA successfully in the 3 rd symbol, the CCA/eCCA occupies the first 3 OFDM symbols, and then the mapped CRS in the first 3 symbols of the subframe is discarded, and the CRS is mapped only in the following 11 symbols according to the pattern specified by the existing LTE protocol.

In one case, the total duration of CCA/ECCA is fixed, for example, it is specified that CCA/ECCA is performed in the first n (n is a positive integer) symbols of the subframe, and then it is obvious that there must be 14 (for example, the number of symbols corresponding to the normal CP) -n LTE symbols in the subframe. For this case, one can handle as follows:

1) the reference signals, PSS/SSS, described above, are mapped in the 14-n symbols of the subframe in the manner described above. And if the corresponding symbol is occupied by CCA/eCCA, the reference signal, PSS/SSS planned to be mapped in the symbol is knocked down. In the first n symbols, a reservation signal is sent from an incomplete LTE symbol (if any) and a complete LTE symbol (if any) in a period from a time point after the CCA/eCCA succeeds (that is, the station performs CCA/eCCA to obtain the use right) to an end of the nth symbol (at this time, the reservation signal in the incomplete LTE symbol is not defined in this patent, and the reservation signal in the complete LTE symbol may be defined in the present invention or may be defined in this patent).

2) The reference signal, PSS/SSS, described above, is mapped in the 14-n symbols as described above. And if the corresponding symbol is occupied by CCA/eCCA, the reference signal, PSS/SSS planned to be mapped in the symbol is knocked down. In the first n symbols, transmitting a reservation signal from an incomplete LTE symbol in a period from a time after the CCA/eCCA succeeds to the end of the nearest LTE symbol; and transmitting reference signals, PSS/SSS according to the complete LTE OFDM symbols remained in the subframe from the end of the latest LTE symbol to the end of the nth symbol.

For the case that the CCA/eCCA starts from any position moment in the subframe. And carrying out mapping transmission of the reference signals and the PSS/SSS in the time period from the beginning of the CCA/eCCA to the end of the subframe in the subframe according to the mode. And transmitting a time period from the starting position of the subframe to the starting position of the CCA/eCCA in the subframe according to a mapping rule of a reference signal and a PSS/SSS in the prior art.

Further, the complete LTE symbols are divided into two types in the subframe, one type is LTE OFDM allocated to the CCA/eCCA time period and left after the CCA/eCCA is successfully performed, and the other type is LTE OFDM allocated to the time period outside the CCA/eCCA time period. In the two types of LTE symbols, the mapping is sent according to the pattern of CRS of 1 or 2 antenna ports in the first symbol in the subframe. Or, the former LTE OFDM symbol is mapped and transmitted according to the pattern of CRS of 1 or 2 antenna ports in the first symbol in the subframe, and the latter LTE OFDM symbol is mapped with reference signals, PSS/SSS according to the aforementioned manner.

The above-mentioned various types of signals may be mixed without collision, or may be mixed in units of symbols.

Specific examples are provided below.

Example one

It is assumed that the time for performing CCA/eCCA starts from the start of the subframe, and the first 3 symbols are configured for CCA/eCCA maximum use (3 is just an example and other values are also possible). The station performs CCA/eCCA in a certain subframe, the station determines that its CCA/eCCA succeeds, the station determines whether there are complete LTE OFDM symbols in symbols allocated to the CCA/eCCA (in the first 3 symbols in this embodiment), and when the station determines that there are complete LTE OFDM symbols (assuming that there are remaining 2 complete symbols), the station transmits PSS and SSS in the aforementioned 2 complete symbols, which may be transmitted according to the aforementioned manner in the present invention. The station transmits one or more of CRS, PRS and CSI-RS in the following 11 symbols (taking the subframe containing 14 symbols as an example), and the mapping mode is according to the aforementioned mode in the present invention.

Example two

Based on the assumption of embodiment 1, the station transmits PSS, SSS only in the middle 63 subcarriers except for the middle one of the carriers among the aforementioned 2 complete symbols. The station transmits one or more of CRS, PRS and CSI-RS in 13 symbols in the following 11 symbols and the aforementioned 2 complete symbols, and the mapping manner is according to the aforementioned manner in the present invention.

EXAMPLE III

A design of a reservation signal consisting of PSS/SSS and existing RS to occupy all symbols in a subframe is provided in fig. 5. For example, PSS/SSS, CRS, PRS, CSI-RS, PRS are optional configuration.

The PSS/SSS is located in the 2 nd and 3 rd symbols, where there is currently no reference signal to transmit, so the PSS/SSS is transmitted to occupy the channel.

The reservation signal can be used to occupy the entire subframe.

A signal mapping in a CCA/eCCA subframe is provided in fig. 6. It is assumed that the time for performing CCA/eCCA starts from the start of the subframe, and the first 3 symbols are configured for CCA/eCCA maximum use (3 is just an example and other values are also possible). The station performs CCA/eCCA in a certain subframe, the station determines that its CCA/eCCA succeeds, the station determines whether there are complete LTE OFDM symbols in the symbols allocated to the CCA/eCCA (in the first 3 symbols in this embodiment), and when the station determines that there are complete LTE OFDM symbols (assuming that there are 2 complete symbols left), the station transmits PSS and SSS in the 2 complete symbols. The station may then continue to transmit the RS and PSS/SSS in fig. 5 in symbols 3 symbols after the CCA/eCCA is configured.

Wherein RS, PSS/SSS can adopt the mode.

Example four

Based on the assumption of embodiment 1, the station performs CCA/eCCA in the first 3 symbols, transmits one or more of CRS, PRS, and CSI-RS in the aforementioned manner in the last 11 symbols and the aforementioned 2 complete symbols (which means the remaining 2 symbols of the first 3 symbols allocated to perform CCA/eCCA because the station completes CCA/eCCA in the first symbol), and transmits in the aforementioned manner in the total 13 symbols, the mapping manner is in the aforementioned manner in the present invention, fig. 7 shows an illustration where R0 is CRS port 0, R1 is CRS port 1, R6 is PRS, and R1 in fig. 7 is optional. Wherein, CRS and PRS are required (PRS are transmitted according to full bandwidth), and CRS is 1 or 2 antenna ports, PRS is corresponding to 1 and 2 PBCH antenna ports. The CSI-RSs can be configured into 0 set or more sets, and if the CSI-RSs are required to perform CSI measurement or RRM measurement according to the CSI-RSs, the station can configure the corresponding CSI-RSs into the CSI measurement or RRM measurement. Wherein, the CRS of the first symbol in fig. 7 is dropped due to performing CCA/eCCA, and mapping is required if CCA/eCCA is not performed.

When a subframe in which the CCA/eCCA is located has downlink data (including user data and broadcast-like data, and the downlink data may occupy 80% of a system bandwidth), the CRS may be transmitted in 13 or the following 11 symbols, and the PRS may not be transmitted at this time. If the CSI-RS is required to perform measurement, the station may configure the corresponding CSI-RS as CSI measurement or RRM measurement as required. At this time, preferably, the PSS/SSS is transmitted in the subframe, and the transmission method may be performed as described above.

When the subframe where the CCA/eCCA is located does not transmit downlink data, in this case, the station may start to issue downlink data from the next subframe for scheduling simplicity. At this time, the station needs to select CRS and PRS to transmit in the 13 symbols. However, it is found that there is no reference signal in the first and second symbols of the 13 symbols, and then the PSS or SSS may be transmitted, and the specific transmission method may refer to the foregoing method.

For a symbol that has transmitted the PSS/SSS, if the reference signal is transmitted in the symbol at the same time, then the PSS/SSS in the symbol is no longer transmitted in the frequency domain spreading at this time.

EXAMPLE five

Based on the assumption of embodiment 1, the station performs CCA/eCCA in the first 3 symbols, and 11 symbols and the aforementioned 2 complete symbols (which means that the station completes CCA/eCCA in the first symbol, and thus the remaining 2 symbols of the first 3 symbols allocated to perform CCA/eCCA) in the last 3 symbols, one or more of CRS, PRS, and CSI-RS are transmitted in the aforementioned manner in 13 symbols, and the mapping manner is according to the aforementioned manner in the present invention. Since the 13 symbols in the subframe include the 6 th and 7 th symbols, the PSS and SSS are transmitted on the 6 th and 7 th symbols. Specifically, the SSS may be transmitted in the 6 th symbol, the PSS in the 7 th symbol, or vice versa. The PSS and/or SSS at this time may adopt PSS and/or SSS sequences other than those in the current LTE system. In this case, data may also be sent in the 13 symbols or the 11 symbols.

Or, the station performs CCA/eCCA in the first 3 symbols, followed by 11 symbols and the aforementioned 2 complete symbols (which means that since the station completes CCA/eCCA in the first symbol, the remaining 2 symbols of the first 3 symbols allocated to performing CCA/eCCA).

The station transmits one or more of CRS, PRS and CSI-RS in the 11 symbols according to the method, and the mapping method is according to the method in the invention. Since the 6 th and 7 th symbols are included in the subframe at this time, the PSS and SSS are transmitted on the 6 th and 7 th symbols at this time. Specifically, the SSS may be transmitted in the 6 th symbol, the PSS in the 7 th symbol, or vice versa. The PSS and/or SSS at this time may adopt PSS and/or SSS sequences other than those in the current LTE system. In this case, data may also be sent in the 13 symbols or the 11 symbols.

EXAMPLE six

Based on the assumption of embodiment 1, the station transmits PSS, SSS in the first 2 symbols after the CCA/eCCA allocated symbol (i.e., the first 2 symbols of the following 11 symbols, or the 4 th and 5 th symbols of the entire subframe). Specifically, according to the whole subframe description, SSS may be transmitted in the 4 th symbol, PSS may be transmitted in the 5 th symbol, or vice versa. The PSS and/or SSS at this time may adopt PSS and/or SSS sequences other than those in the current LTE system. Reference signals in other symbols may be transmitted in the manner described previously. Such as CRS, PRS, and configuration CSI-RS.

EXAMPLE seven

In this embodiment, a reference signal pattern is provided for sending in the remaining complete OFDM symbols to achieve the effect of occupying channels and improve the synchronization accuracy.

Fig. 8 and 9 show a resource unit mapping pattern of one PRB pair in a subframe, where R indicates reference signal mapping. When the corresponding LTE symbol in the subframe is occupied by CCA/eCCA, the reference signal in the symbol is knocked off without mapping. In the position mapped by the reference signal illustrated in the figure, the reference signals at different positions may be mapped by a plurality of different antenna ports respectively, or mapped by one antenna port. And if the PSS/SSS is mapped in the symbol, the corresponding reference signal is marked at the position where the PSS/SSS is mapped, the reference signal is not mapped, and the reference signal is mapped at other positions of the symbol. If the symbol has user data (including control information) to be transmitted, the reference signal is not mapped at the position where the user data is transmitted, other positions are mapped, or the user data is not mapped at the position of the reference signal when mapped, and the reference signal is still mapped and transmitted.

Fig. 10, 11, and 12 show another resource unit mapping pattern according to one PRB pair in a subframe, where R indicates reference signal mapping. When the corresponding LTE symbol in the subframe is occupied by CCA/eCCA, the reference signal in the symbol is knocked off without mapping. In the position mapped by the reference signal illustrated in the figure, the reference signals at different positions may be mapped by a plurality of different antenna ports respectively, or mapped by one antenna port. And if the PSS/SSS is mapped in the symbol, the corresponding reference signal is marked at the position where the PSS/SSS is mapped, the reference signal is not mapped, and the reference signal is mapped at other positions of the symbol. If the symbol has user data (including control information) to be transmitted, the reference signal is not mapped at the position where the user data is transmitted, other positions are mapped, or the user data is not mapped at the position of the reference signal when mapped, and the reference signal is still mapped and transmitted.

The reference signal patterns of fig. 8-12 may also be mapped onto complete lte ofdm symbols in the manner described above in connection with the present invention.

Example eight

Referring to fig. 13, the transmission of the reservation signal in the full symbol can be analyzed and considered from the following 2 aspects.

case1, not sending user data in the complete symbol, only sending the reservation signal reservation channel until the next sub-frame;

the LAA site sends a reservation signal in a complete symbol and starts scheduling user data in the next subframe. In this case, the reserved signal is mainly used to occupy the channel and prevent other stations or systems from robbing the channel, so that each symbol needs to have a signal transmitted, so that the signal energy in the symbol is non-null when detected by other stations. In order to achieve the above purpose, the reservation signal should include CRS and PRS. The reservation signal may also be used to help the UE improve synchronization, so PSS/SSS (similar to Rel-8) may also be configured. The CSI-RS can also be configured if it is considered to improve the measurements (CSI, RRM) of the UE.

Usually, CCA/eCCA is performed from the starting position of the subframe, but the time point of the stop is difficult to determine, so if PSS/SSS is configured, the PSS/SSS can be transmitted in 2 symbols immediately after the symbol where the CCA/eCCA successful time point is located. Additionally, the PSS/SSS can also be used to identify the starting location of the complete symbol.

In case1, when the LAA station performs CCA/eCCA and successfully acquires the channel in symbol #0, symbol #1, symbol #2 transmit PSS/SSS. At this time, in order to satisfy the requirement that the bandwidth of the transmission signal is not less than 80% of the nominal channel, the PSS/SSS can be spread in the frequency domain, specifically the FFS spread.

case2, sending user data and necessary reference signals in full symbols;

when the bandwidth occupied by the user data is equal to 80% higher than the nominal channel bandwidth, the LAA site can only transmit the user data and the necessary demodulation reference signal, so as to achieve the purpose of occupying the channel. If the UE is synchronized and measured better, the reservation signal sent in case1 (for example, the reservation signal is formed by combining CRS, CSI-RS, PSS/SSS, and PRS is optional) can also be sent, and the user data is not mapped in the location of the reservation signal.

When the bandwidth occupied by the user data is less than 80% of the nominal channel bandwidth, the LAA station still needs to send a reservation signal in the form of case1 at this time to meet the regulation requirement, and also to prevent other frequencies of the unlicensed carrier from being preempted by other stations or systems.

Through the above analysis, the design principle of the reserved signal in the complete symbol is as follows:

1. the reserved signal should include the existing CRS, PRS, PSS/SSS, CSI-RS; so as to avoid designing new reservation signals and reduce the workload of standardization.

2. The LAA site can be used for configuring the specific existing signals of the reserved signals so as to meet different scene requirements; at the same time, it is also very good if the reservation signal composition is uniquely determined, which may reduce signaling overhead.

3. In the complete symbol, the reservation signal is transmitted regardless of whether user data is transmitted or not; the unified processing mode can reduce the complexity, and the reserved signals can also help to improve the synchronization and measurement of the UE.

4. The PSS/SSS in the reserved signal is positioned in 2 symbols which are immediately after a symbol which is successfully obtained by performing CCA/eCCA by an LAA site; for frequency domain spreading of the PSS/SSS, if needed, the specific spreading manner may refer to the foregoing manner; the PSS/SSS can also identify the starting location of the complete symbol.

Example nine

An embodiment of the present invention provides a station, where a structure of the station is shown in fig. 14, and the station includes:

a PSS/SSS transmitting module 1401, configured to transmit PSS and/or SSS in a complete LTE OFDM symbol of an occupied subframe resource after a successful CCA/eCCA execution within a subframe.

Preferably, the PSS/SSS transmitting module includes 1401:

a first sending unit 14011, configured to select 2 complete LTE OFDM symbols to send PSS and/or SSS after the CCA/eCCA is successfully performed when the remaining part of the subframe of the CCA/eCCA can be divided into 2 or more complete LTE OFDM symbols.

Preferably, the PSS/SSS transmitting module 1401 further includes:

a second transmitting unit 14012, configured to transmit a PSS or an SSS on a remaining part of the CCA/eCCA subframe when the remaining part of the CCA/eCCA subframe can be divided into 1 complete LTE OFDM symbol, and transmit an unsent SSS and/or PSS in a next subframe of the CCA/eCCA subframe.

Preferably, the station further comprises:

a reserved signal sending module 1402, configured to send a reserved signal in other LTE OFDM symbols in a subframe of a CCA/eCCA after the CCA/eCCA is successfully performed, where the reserved signal includes a reference signal, and the reference signal is one or more of:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the station further comprises:

a reference signal transmission module 1403, configured to transmit a reference signal in the divided complete LTE OFDM symbol, where the reference signal includes any one or any multiple of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the station further comprises:

a PDCCH/ePDCCH transmitting module 1404, configured to transmit a PDCCH or ePDCCH in a complete LTE OFDM symbol when a remaining time in a subframe of the CCA/eCCA can also partition the complete LTE OFDM symbol after the CCA/eCCA is successfully performed.

An embodiment of the present invention further provides a station, a structure of which is shown in fig. 15, including:

a reference signal sending module 1501, configured to send a reference signal in a complete LTE OFDM symbol when a remaining time in a subframe occupied by a CCA/eCCA can also divide the complete LTE OFDM symbol after the CCA/eCCA is successfully performed in the subframe, where the reference signal includes any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the station further comprises:

a PSS/SSS transmitting module 1502, configured to transmit PSS and/or SSS in a complete LTE OFDM symbol when a remaining time in a subframe of CCA/eCCA can also mark off the complete LTE OFDM symbol after the CCA/eCCA is successfully performed.

An embodiment of the present invention further provides a station, a structure of which is shown in fig. 16, including:

a reserved signal transmitting module 1601, configured to transmit a reserved signal in a complete LTE OFDM symbol when a remaining time in a subframe occupied by a CCA/eCCA can also divide the complete LTE OFDM symbol after the CCA/eCCA is successfully performed in the subframe, where the reserved signal includes a reference signal, and the reference signal includes any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

preferably, the reservation signal further includes a PSS and/or an SSS, and the reservation signal transmitting module 1601 includes:

a PSS/SSS transmitting unit 16011, configured to, when the remaining part of the subframe of the CCA/eCCA can be divided into 2 or more complete LTE OFDM symbols, the station selects 2 complete LTE OFDM symbols to transmit PSS and/or SSS after the CCA/eCCA is successfully performed.

Preferably, the PSS/SSS transmitting unit 16011 is further configured to transmit a PSS or an SSS on a LTE OFDM symbol when a remaining part of the CCA/eCCA subframe can be divided into 1 complete LTE OFDM symbol, and transmit an unsent SSS and/or PSS in a next subframe of the CCA/eCCA subframe.

Preferably, the reservation signal transmitting module 1601 further includes:

a reference signal transmitting unit 16012, configured to transmit the reference signal in the marked complete lte ofdm symbol after the CCA/eCCA is successfully performed.

The embodiment of the invention provides a data transmission method and a site, wherein the site transmits PSS and/or SSS or reference signals or reserved signals in complete LTE OFDM symbols of occupied subframe resources after CCA/eCCA is successfully executed in a subframe. The utilization of the residual resources after the execution of the CCA/eCCA is realized, and the problem of utilizing other resources except the resources corresponding to the CCA duration is solved.

It will be understood by those of ordinary skill in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium and executed on a corresponding hardware platform (e.g., system, apparatus, device, etc.), and when executed, includes one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may be implemented by using an integrated circuit, and the steps may be respectively manufactured as an integrated circuit module, or a plurality of the blocks or steps may be manufactured as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The devices/functional modules/functional units in the above embodiments may be implemented by general-purpose computing devices, and they may be centralized on a single computing device or distributed on a network formed by a plurality of computing devices.

Each device/function module/function unit in the above embodiments may be implemented in the form of a software function module and may be stored in a computer-readable storage medium when being sold or used as a separate product. The computer readable storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc.

Any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all such changes or substitutions are included in the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method of data transmission, comprising:

after a station successfully performs clear channel assessment/extended clear channel assessment (CCA/eCCA) in a subframe, the station transmits a Primary Synchronization Signal (PSS) and/or a Secondary Synchronization Signal (SSS) in a complete Long Term Evolution (LTE) Orthogonal Frequency Division Multiplexing (OFDM) symbol of occupied subframe resources;

the station sends the PSS and/or SSS in a complete LTE OFDM symbol of occupied subframe resources, specifically, the station selects the remaining complete LTE OFDM symbol in a subframe where the CCA/eCCA is located to send the PSS and/or SSS.

2. The data transmission method according to claim 1, wherein the transmitting, by the station, the PSS and/or the SSS in a complete LTE symbol of the occupied subframe resource specifically is:

3. The data transmission method of claim 2, wherein the station sends the SSS first and then the PSS in the 2 complete lte ofdm symbols.

4. The data transmission method of claim 2, wherein the station sends the PSS followed by the SSS in the 2 complete lte ofdm symbols.

5. The data transmission method according to claim 2, wherein the 2 complete LTEOFDM symbols selected by the station are specifically the 1 st and 2 nd complete LTE OFDM symbols after successful CCA/eCCA execution.

6. The data transmission method according to claim 1, wherein the transmitting, by the station, the PSS and/or the SSS in a complete LTE symbol of the occupied subframe resource specifically is:

7. The data transmission method of claim 1, further comprising the station transmitting an unsent SSS and/or PSS in a next subframe of a subframe of the CCA/eCCA.

8. The data transmission method of claim 1, further comprising:

9. The data transmission method of claim 8, wherein the reservation signal further comprises a PSS and/or an SSS.

10. The data transmission method of claim 1, further comprising:

CRS、CSI-RS、PRS、DRS、DMRS。

11. the data transmission method according to claim 10,

the CRS comprising one or more of: 1 antenna port, 2 antenna ports, 4 antenna ports;

the DMRS, including one or more UE-specific reference signals as PDSCH;

the CSI-RS is one or more sets of CSI-RSs.

12. The data transmission method of claim 10, further comprising:

13. The data transmission method according to claim 12, wherein the station ensures that at least one type of reference signal is transmitted in each LTE OFDM symbol, specifically:

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

14. The data transmission method of claim 10, further comprising:

and when the station sends the reference signal, mapping in an LTE OFDM symbol in a subframe according to a mode specified by an LTE protocol, and when the corresponding LTE OFDM symbol is occupied by CCA/eCCA, knocking off the reference signal mapped in the LTE OFDM symbol occupied by CCA/eCCA.

15. The data transmission method according to claim 1,

the position of the CCA/eCCA in the time direction in the subframe is in a fixed range, and the CCA/eCCA allows starting execution in any symbol in the subframe.

16. The data transmission method according to claim 1,

after the CCA/eCCA is successfully executed, when the remaining time in the subframe of the CCA/eCCA can also mark out a complete LTE OFDM symbol, the station sends the PDCCH or the ePDCCH in the complete LTE OFDM symbol.

17. The data transmission method according to claim 1, wherein the station sending PSS and/or SSS in the complete LTE symbol specifically is:

18. The method according to claim 17, wherein the station allocates subcarriers for the PSS or SSS in units of 63 subcarriers to a low frequency end or a high frequency end, except for 63 subcarriers in a center of the carrier, when using the PSS or SSS transmitted by the other frequency-domain locations, and a most middle subcarrier of each unit is not used when the PSS or SSS is transmitted.

19. The data transmission method of claim 18, further comprising:

a space of at least one subcarrier is reserved between units.

20. The method according to claim 17, wherein the station allocates subcarriers for the PSS or SSS in units of 62 subcarriers to the low/high frequency end outside 63 subcarriers in the center of the carrier when transmitting the non-transmitted PSS or SSS using the other frequency domain locations, and transmits the PSS or SSS in each subcarrier within the unit when transmitting the PSS or SSS in the unit.

21. The data transmission method of claim 20, further comprising:

a space of at least one subcarrier is reserved between units.

22. The data transmission method of claim 17, further comprising:

23. A method of data transmission, comprising:

after a station successfully executes CCA/eCCA in a subframe, when a complete LTE OFDM symbol can be further divided by the remaining time in the subframe occupied by the CCA/eCCA, a reference signal is sent in the complete LTE OFDM symbol, and a PDCCH or an ePDCCH is sent, wherein the reference signal comprises any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

24. the data transmission method of claim 23,

the CSI-RS is one or more sets of CSI-RSs.

25. The data transmission method of claim 23, further comprising:

26. The data transmission method according to claim 25, wherein the station ensures that at least one type of reference signal is transmitted in each LTE OFDM symbol, specifically:

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

27. The data transmission method of claim 23, further comprising:

28. The data transmission method of claim 23,

29. The data transmission method of claim 23,

after the CCA/eCCA is successfully executed, when the residual time in the subframe of the CCA/eCCA can also mark out a complete LTE OFDM symbol, the station sends the PSS and/or the SSS in the complete LTE OFDM symbol.

30. The data transmission method of claim 23, wherein when the remaining part of the subframe of the CCA/eCCA can be divided into 2 or more complete LTE OFDM symbols, the station selects 2 complete LTE OFDM symbols to transmit PSS and/or SSS after successful CCA/eCCA performance.

31. The data transmission method of claim 30, wherein the station sends SSS first and PSS second in the 2 complete lte ofdm symbols.

32. The method for data transmission according to claim 30, wherein the station sends the PSS followed by the SSS in the 2 complete lte ofdm symbols.

33. The data transmission method of claim 30, wherein the 2 complete LTE OFDM symbols are selected for a first and a second complete LTE OFDM symbols after the CCA/eCCA is successfully performed.

34. The data transmission method of claim 29,

when the remaining part of the CCA/eCCA subframe can be divided into 1 OFDM symbol, the station transmits a PSS or SSS on the station, and transmits an unsent SSS or PSS in the next subframe of the CCA/eCCA subframe.

35. The data transmission method of claim 23, further comprising:

CRS、CSI-RS、PRS、DRS、DMRS。

36. the data transmission method of claim 35, wherein the reservation signal further comprises PSS and/or SSS.

37. The data transmission method of claim 29,

when only PSS or SSS is transmitted in the complete LTE OFDM symbol, the station transmits PSS or SSS at the other frequency domain positions of the complete LTE OFDM symbol besides the frequency domain positions of the PSS or SSS in the carrier according to LTE specification, wherein the frequency domain positions of the PSS or SSS in the carrier are positioned at the center 63 subcarriers of the carrier except the middle subcarrier.

38. The method of claim 37, wherein the station allocates subcarriers for the PSS or SSS in units of 63 subcarriers to a low frequency end or a high frequency end when the PSS or SSS is transmitted using the other frequency domain locations, and wherein a most middle subcarrier of each unit is not used when the PSS or SSS is transmitted.

39. The data transmission method of claim 38, further comprising:

a space of at least one subcarrier is reserved between units.

40. The method of claim 37, wherein the station allocates subcarriers for the PSS or SSS in 62 subcarriers to the low/high frequency end outside 63 subcarriers in the center of the carrier when transmitting the PSS or SSS using the other frequency domain locations, and wherein the PSS or SSS in each unit is transmitted in each subcarrier within the unit.

41. The data transmission method of claim 40, further comprising:

a space of at least one subcarrier is reserved between units.

42. The data transmission method of claim 37, further comprising,

43. A method of data transmission, comprising:

CRS、CSI-RS、PRS、DRS、DMRS；

wherein the reservation signal further comprises a PSS and/or a SSS, and transmitting the reservation signal in the complete LTE OFDM symbol comprises:

44. The data transmission method of claim 43, wherein the station sends SSS before PSS in the 2 complete LTEOFDM symbols.

45. The method for data transmission according to claim 43, wherein the station sends the PSS and then the SSS in the 2 complete LTEOFDM symbols.

46. The data transmission method according to claim 43, wherein the 2 complete LTEOFDM symbols selected by the station are specifically the 1 st and 2 nd complete LTE OFDM symbols after successful CCA/eCCA execution.

47. The data transmission method of claim 43, wherein when the remaining part of the CCA/eCCA subframe can be divided into 1 complete LTE OFDM symbol, the station transmits PSS or SSS on the LTE OFDM symbol, and transmits non-transmitted SSS and/or PSS in a next subframe of the CCA/eCCA subframe.

48. The data transmission method of claim 43, wherein the allowable range of time direction positions of the CCA/eCCA in a subframe is fixed, and wherein the CCA/eCCA is allowed to start executing in any symbol in the subframe.

49. The method of claim 43, wherein when the station transmits the PSS or SSS, and when only the PSS or SSS exists in the complete LTE OFDM symbol, the station transmits the PSS or SSS at the other frequency domain positions of the complete LTE OFDM symbol besides the frequency domain positions of the PSS or SSS in the carrier according to LTE specification, and the frequency domain positions of the PSS or SSS in the carrier according to LTE specification are located at the center 63 subcarriers of the carrier except for the most middle subcarrier.

50. The method of claim 49, wherein the station allocates subcarriers for the PSS or SSS in units of 63 subcarriers at a low frequency end or a high frequency end except for 63 subcarriers at a center of the carrier when using the PSS or SSS transmitted by the other frequency-domain locations, and wherein a most middle subcarrier of each unit is not used when the PSS or SSS is transmitted.

51. The data transmission method of claim 50, further comprising:

a space of at least one subcarrier is reserved between units.

52. The method of claim 49, wherein the station allocates subcarriers for the PSS or SSS in units of 62 subcarriers to the low frequency end/high frequency end outside 63 subcarriers in the center of the carrier when transmitting the PSS or SSS that is not transmitted using the other frequency domain locations, and wherein the PSS or SSS in each unit is transmitted in each subcarrier within the unit.

53. The data transmission method of claim 52, further comprising:

a space of at least one subcarrier is reserved between units.

54. The data transmission method of claim 43, further comprising:

55. The data transmission method of claim 43, wherein transmitting a reservation signal in the complete LTE OFDM symbol further comprises:

56. The data transmission method of claim 55,

the CSI-RS is one or more sets of CSI-RSs.

57. The data transmission method of claim 56, wherein when the station does not transmit data in the divided complete LTE OFDM symbols, the station guarantees that at least one type of reference signal is transmitted in each LTE OFDM symbol.

58. The data transmission method according to claim 57, wherein the station ensures that at least one type of reference signal is transmitted in each LTE OFDM symbol, specifically:

the station transmits CRS and PRS simultaneously, or,

the station transmits CRS, CSI-RS and data simultaneously, or,

the station transmits CRS, CSI-RS and PRS simultaneously, or,

the station simultaneously transmits CRS, CSI-RS and a reservation signal, or,

the station transmits the CRS and the data at the same time,

59. The data transmission method of claim 57, further comprising:

60. A station, comprising:

the PSS/SSS sending module is used for sending PSS and/or SSS in a complete LTE OFDM symbol of occupied subframe resources after CCA/eCCA execution in a subframe is successful;

the PSS/SSS sending module is specifically configured to: and after the CCA/eCCA is successfully executed in the subframe, selecting the residual complete LTE OFDM symbols in the subframe where the CCA/eCCA is positioned to transmit the PSS and/or the SSS.

61. The station of claim 60, wherein the PSS/SSS transmission module comprises:

62. The station of claim 61, wherein the PSS/SSS transmission module further comprises:

63. The station of claim 60, further comprising:

CRS、CSI-RS、PRS、DRS、DMRS。

64. the station of claim 60, further comprising:

CRS、CSI-RS、PRS、DRS、DMRS。

65. the station of claim 60, further comprising:

66. A station, comprising:

a reference signal transmitting module, configured to, after a CCA/eCCA is successfully executed in a subframe, transmit a reference signal in a complete LTE OFDM symbol and transmit a PDCCH or ePDCCH when the remaining time in the subframe occupied by the CCA/eCCA can also divide the complete LTE OFDM symbol, where the reference signal includes any one or more of the following signals:

CRS、CSI-RS、PRS、DRS、DMRS。

67. the station of claim 66, further comprising:

68. A station, comprising:

CRS、CSI-RS、PRS、DRS、DMRS；

wherein the reservation signal further comprises a PSS and/or a SSS, and the reservation signal transmitting module comprises:

69. The station according to claim 68,

the PSS/SSS transmitting unit is further configured to transmit a PSS or an SSS on a LTE OFDM symbol when a remaining part of the CCA/eCCA subframe can be divided into 1 complete LTE OFDM symbol, and transmit an unsent SSS and/or PSS in a next subframe of the CCA/eCCA subframe.

70. The station of claim 68, wherein the reservation signaling module further comprises: