WO2017049720A1

WO2017049720A1 - Channel detection method and channel detection apparatus

Info

Publication number: WO2017049720A1
Application number: PCT/CN2015/093485
Authority: WO
Inventors: 李明菊; 朱亚军; 张云飞
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2015-09-25
Filing date: 2015-10-31
Publication date: 2017-03-30
Also published as: CN105307179A; CN105307179B

Abstract

The present invention provides a channel detection method and a channel detection apparatus. The channel detection method comprises: in a process in which a sender occupies a channel to transmit data, determining whether a channel occupation time ends; and when it is determined that any channel occupation time ends, starting an ECCA channel detection process. By means of the technical solution of the present invention, conditions for executing an ECCA process and an ICCA process by a sender can be determined, thereby effectively ensuring the fairness when a sender preempts unlicensed frequency spectrums.

Description

Channel detection method and channel detecting device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a channel detecting method and a channel detecting apparatus.

Background technique

Currently, 3GPP proposes the concept of LTE Assisted Access (LAA) for using unlicensed spectrum with the help of LTE (Long Term Evolution) licensed spectrum. One of the key points in the use of unlicensed bands in LTE networks is to ensure that the LAA system can coexist with existing access technologies (such as Wi-Fi) on a fair and friendly basis. In the traditional LTE system, there is no LBT (Listen Before Talk) mechanism to avoid collision. In order to coexist better with Wi-Fi, the LTE system needs an LBT mechanism. In this way, if the LTE detects that the channel is busy on the unlicensed spectrum, the LTE cannot occupy the frequency band, and if the channel is detected to be idle, it can be occupied.

Based on the above problems, an LBT mechanism based on LBE (Load based equipment) is proposed in the related art, as shown in FIG. 1. The LBT-based LBT mechanism is cycle-free, and CCA is triggered as long as the service arrives. Detection, if the CCA detection is idle, immediately send signaling or data; if the channel is detected to be busy, take a random number N, N ranges from 1 to q, where q is the length of the contention window, and its value The range is 4 to 32. Fig. 1 shows the case of q = 16, in which case, when the channel is detected to be idle, the channel maximum occupation time is (13/32) × q = 6.5 ms. After 6.5ms, the ECCA (Extended CCA) mechanism is adopted, that is, the random value N, N ranges from 1 to q. If the value is 8, it means that in the next consecutive CCA detection time, each The channel is detected at the CCA detection time. If the channel is detected to be idle, N-1, if the channel is detected to be busy, N is unchanged, and when N is 0, signaling or data is transmitted.

In addition, in order to further maintain fairness with Wi-Fi, LBE adopts different ICCA (initial CCA) and ECCA values, where the first CCA test is called ICCA, and the time granularity is relatively large, such as 34us; when the channel busy is detected or the channel occupancy time is cut off, the time granularity of the ECCA is relatively small, such as 9us. . Meanwhile, as shown in FIG. 2, in the channel detection, if the channel is detected to be busy, a defer period is added, and the value of the defer period is equivalent to the value of the initial CCA, that is, it must be long time again. It is detected that the channel is idle before continuing N-1.

Since each packet arrives at a certain size, and generally requires multiple maximum channel occupation times to be transmitted. If the channel is busy, the value of the contention window q may be large, and the time required for the ECCA process will be long. Then, after the end of one channel occupation time, the transmission point may not perform the ECCA process, but perform an initial ICCA channel detection before the data transmission, which will easily preempt the channel than the ECCA process, but this method affects the transmission point. Fairness in preempting unlicensed spectrum.

Therefore, how to clarify the conditions for the sending point to perform the ECCA process and the ICCA process to ensure the fairness of the transmitting point in preempting the unlicensed spectrum becomes a technical problem to be solved.

Summary of the invention

The present invention is based on at least one of the above technical problems, and proposes a new channel detection scheme, which can clarify the conditions for the sender to perform the ECCA process and the ICCA process, and effectively ensure the fairness of the sender when preempting the unlicensed spectrum.

In view of this, according to the first aspect of the present invention, a channel detection method is provided, including: determining, by a sender, whether a channel occupation time ends in a process of occupying a channel to transmit data; and determining that any channel occupation time ends, Turn on the ECCA channel detection process.

In this technical solution, by turning on the ECCA channel detection process at the end of any channel occupation time, it is possible to prevent the sender from performing the ICCA channel detection process after the end of the channel occupation time, and it is easier to preempt than other transmission points performing the ECCA channel detection process. The problem of the channel effectively ensures the fairness of different senders when preempting the unlicensed spectrum to transmit data. The end of the channel occupation time includes the following two situations: one is that the duration of occupying the channel reaches the maximum channel occupation time; and the other is that all data in the buffer is completely transmitted.

In the above technical solution, preferably, after the ECCA channel detection process is turned on, The method further includes: determining, at the end of the ECCA channel detection process, whether there is data to be transmitted; if it is determined that the data to be transmitted does not exist, entering an idle state, and starting ICCA when the data to be transmitted arrives a channel detecting process; determining whether to transmit the data to be transmitted according to a detection result of the ICCA channel detecting process.

In any one of the foregoing technical solutions, after the ECCA channel detection process is started, the method further includes: if the data to be transmitted is already present when the ECCA channel detection process is started, or the data to be transmitted is in the After the end of the ECCA channel detection process, the data to be transmitted is determined according to the detection result of the ECCA channel detection process after the end of the ECCA channel detection process.

In any one of the foregoing technical solutions, preferably, after the ECCA channel detection process is started, the method further includes: if the data to be transmitted arrives before the end of the ECCA channel detection process, at the end of the ECCA channel detection process Or, when the data to be transmitted arrives, restarting the ECCA channel detection process, and determining whether to send the data to be transmitted according to the detection result of the restarted ECCA channel detection process.

In any of the above technical solutions, preferably, the method further includes:

Defer period process is performed after any one channel occupancy time ends, and before the ECCA channel detection process is turned on;

In the ECCA channel detection process, if any ECCA detection granularity detects that the channel is busy, the defer period process is performed after the ECCA detection granularity.

According to a second aspect of the present invention, a channel detecting apparatus is further provided, including: a first determining unit, configured to determine, by a sender, whether a channel occupation time ends in a process of occupying a channel to transmit data; and a processing unit, configured to The first determining unit determines that the ECCA channel detecting process is started when any of the channel occupation time ends.

In any one of the foregoing technical solutions, the method further includes: a second determining unit, configured to determine, at the end of the ECCA channel detection process, whether there is data to be transmitted; the processing unit is further configured to: The second determining unit determines that the data to be transmitted does not exist, controls the sender to enter an idle state, and starts an ICCA channel detecting process when the data to be transmitted arrives; the channel detecting apparatus further includes: And a sending unit, configured to determine, according to the detection result of the ICCA channel detecting process, whether to send the data to be transmitted.

In any one of the foregoing technical solutions, preferably, the method further includes: a second sending unit, if the data to be transmitted already exists when the ECCA channel detecting process is started, or the data to be transmitted is in the ECCA channel detecting process Arriving before the end, after the end of the ECCA channel detection process, determining whether to transmit the data to be transmitted according to the detection result of the ECCA channel detection process.

In any one of the foregoing technical solutions, preferably, the processing unit is further configured to: when the data to be transmitted arrives before the end of the ECCA channel detection process, at the end of the ECCA channel detection process or in the waiting When the transmitted data arrives, the ECCA channel detection process is restarted; the channel detecting apparatus further includes: a third sending unit, configured to determine whether to send the to-be-transmitted according to the detection result of the restarted ECCA channel detecting process The data.

In any of the above technical solutions, preferably, the processing unit is further configured to:

Through the above technical solutions, the conditions for the sender to perform the ECCA process and the ICCA process can be clarified, and the fairness of the sender when preempting the unlicensed spectrum is effectively ensured.

DRAWINGS

FIG. 1 is a schematic diagram showing a frame structure of an LBT-based LBT mechanism;

2 shows a schematic diagram of a frame structure of an LBE mechanism including a defer period process;

FIG. 3 shows a schematic flow chart of a channel detecting method according to an embodiment of the present invention; FIG.

FIG. 4 shows a schematic block diagram of a channel detecting apparatus according to an embodiment of the present invention; FIG.

Figure 5 shows a schematic block diagram of a base station in accordance with an embodiment of the present invention;

Figure 6 shows a schematic block diagram of a terminal in accordance with an embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a full understanding of the invention, but the invention may be practiced otherwise than as described herein. Limitations of the embodiments.

FIG. 3 shows a schematic flow chart of a channel detecting method according to an embodiment of the present invention.

As shown in FIG. 3, a channel detecting method according to an embodiment of the present invention includes:

Step 302: The sender determines whether the channel occupation time ends in the process of occupying the channel to transmit data.

Step 304: When it is determined that any of the channel occupation time ends, the ECCA channel detection process is started.

In the foregoing technical solution, after the ECCA channel detection process is started, the method further includes: determining, by the end of the ECCA channel detection process, whether there is data to be transmitted; if it is determined that the data to be transmitted does not exist And entering an idle state, and when the data to be transmitted arrives, starting an ICCA channel detection process; determining whether to send the data to be transmitted according to the detection result of the ICCA channel detection process.

The technical solution clarifies the conditions for the sender to perform the ICCA process. Specifically, when the ECCA channel detection process ends, if the data to be transmitted still does not arrive, the sender can enter the idle state. State, when there is data to be transmitted, the ICCA channel detection process is performed. The step of determining whether to send data to be transmitted according to the detection result of the ICCA channel detection process specifically includes: if the ICCA channel detection process detects that the channel is idle, transmitting data to be transmitted; if the ICCA channel detection process detects that the channel is busy, The data to be transmitted is not sent.

The step of determining whether to send the data to be transmitted according to the detection result of the ECCA channel detection process specifically includes: if the ECCA channel detection process detects that the channel is idle, transmitting the data to be transmitted; if the ECCA channel detection process detects that the channel is busy, The data to be transmitted is not sent.

The step of determining whether to send the data to be transmitted according to the detection result of the restarted ECCA channel detection process specifically includes: if the restarted ECCA channel detection process detects that the channel is idle, transmitting the data to be transmitted; if the ECCA is restarted When the channel detection process detects that the channel is busy, the data to be transmitted is not transmitted.

FIG. 4 shows a schematic block diagram of a channel detecting apparatus according to an embodiment of the present invention.

As shown in FIG. 4, a channel detecting apparatus 400 according to an embodiment of the present invention includes: The determining unit 402 and the processing unit 404.

The first determining unit 402 is configured to determine, by the sender, whether the channel occupation time is ended in the process of occupying the channel to transmit data, and the processing unit 404 is configured to: when the first determining unit 402 determines that the channel occupancy time ends , the ECCA channel detection process is turned on.

In any one of the foregoing technical solutions, the method further includes: a second determining unit 406, configured to determine, at the end of the ECCA channel detecting process, whether there is data to be transmitted; the processing unit 404 is further configured to: When the second determining unit 406 determines that the data to be transmitted does not exist, the sender is controlled to enter an idle state, and when the data to be transmitted arrives, an ICCA channel detecting process is initiated; the channel detecting device 400 The method further includes: a first sending unit 408, configured to determine, according to the detection result of the ICCA channel detecting process, whether to send the data to be transmitted.

The technical solution clarifies the conditions for the sender to perform the ICCA process. Specifically, when the ECCA channel detection process ends, if the data to be transmitted still does not arrive, the sender can enter the idle state, and when there is data to be transmitted, the ICCA is executed. Channel detection process. The step of determining whether to send data to be transmitted according to the detection result of the ICCA channel detection process specifically includes: if the ICCA channel detection process detects that the channel is idle, transmitting data to be transmitted; if the ICCA channel detection process detects that the channel is busy, The data to be transmitted is not sent.

In any one of the above technical solutions, preferably, the method further includes: a second sending unit 410, if the data to be transmitted already exists when the ECCA channel detecting process is started, or the data to be transmitted is detected in the ECCA channel Arriving before the end of the process, after the end of the ECCA channel detection process, whether to transmit the data to be transmitted is determined according to the detection result of the ECCA channel detection process.

Wherein, determining whether to send the number to be transmitted according to the detection result of the ECCA channel detection process The step of the specific method includes: if the ECCA channel detection process detects that the channel is idle, transmitting the data to be transmitted; if the ECCA channel detection process detects that the channel is busy, the data to be transmitted is not sent.

In any one of the foregoing technical solutions, preferably, the processing unit 404 is further configured to: when the data to be transmitted arrives before the end of the ECCA channel detection process, at the end of the ECCA channel detection process or in the When the data to be transmitted arrives, the ECCA channel detection process is restarted; the channel detecting apparatus further includes: a third sending unit 412, configured to determine, according to the detection result of the restarted ECCA channel detecting process, whether to send the The data to be transmitted.

In any of the above technical solutions, the processing unit 404 is further configured to:

Figure 5 shows a schematic block diagram of a base station in accordance with an embodiment of the present invention.

As shown in FIG. 5, a base station 500 according to an embodiment of the present invention includes: a channel detecting apparatus 400 as shown in FIG.

As shown in FIG. 6, a terminal 600 according to an embodiment of the present invention includes: a channel detecting apparatus 400 as shown in FIG.

In summary, the present invention mainly provides conditions for triggering an ECCA channel process and an ICCA channel detection trigger to ensure fairness of multiple transmission points when preempting an unlicensed spectrum. details as follows:

1. After any channel occupancy time has elapsed, the ECCA channel detection process is turned on regardless of whether there is data in the buffer of the transmission point.

1. If there is no data in the buffer at the end of the ECCA detection process, the sending point can enter the idle state. In the following time, if the data packet arrives, ICCA channel detection can be used.

2. If there is data in the buffer at the beginning of the ECCA detection process, after the ECCA process ends, if the ECCA detection result is that the channel is idle, a new channel occupation time is started, and the data in the buffer is transmitted.

3. If there is data arriving during the ECCA detection process, there are two ways to deal with it:

1) After the end of the ECCA process, if the ECCA detection result is that the channel is idle, a new channel occupation time is started, and the data in the buffer is transmitted.

2) After the end of the ECCA process or when the data arrives, restart a new ECCA detection process. After the new ECCA detection process ends, if the new ECCA detection result is that the channel is idle, a new channel occupation time is started. , send the data in the buffer.

Second, after the end of the channel occupation time, and before the ECCA process is started, a process of defer period needs to be configured. In the ECCA process, if any ECCA detection granularity detects that the channel is busy, it also needs to configure a defer period process.

The technical solution of the present invention is described in detail above with reference to the accompanying drawings. Considering that in the case of a busy channel, the transmission point may not perform the ECCA process after the end of the primary channel occupation time, but may perform an initial process before the data is transmitted. ICCA channel detection, which will easily preempt the channel than the ECCA process, affecting the fairness of the transmission point when preempting the unlicensed spectrum. Therefore, the present invention proposes a new channel detection scheme, which can clarify the conditions for the sender to perform the ECCA process and the ICCA process, and effectively ensure the fairness of the sender when preempting the unlicensed spectrum.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A channel detection method, comprising:

The sender determines whether the channel occupation time ends in the process of occupying the channel to transmit data;

The ECCA channel detection process is turned on when it is determined that any channel occupancy time is over.
The channel detection method according to claim 1, wherein after the ECCA channel detection process is turned on, the method further includes:

At the end of the ECCA channel detection process, determining whether there is data to be transmitted;

If it is determined that the data to be transmitted does not exist, enter an idle state, and when the data to be transmitted arrives, initiate an ICCA channel detection process;

Determining whether to send the data to be transmitted according to the detection result of the ICCA channel detection process.
The channel detection method according to claim 1, wherein after the ECCA channel detection process is turned on, the method further includes:

If the data to be transmitted already exists when the ECCA channel detection process is turned on, or the data to be transmitted arrives before the end of the ECCA channel detection process, after the ECCA channel detection process ends, according to the ECCA The detection result of the channel detection process determines whether to transmit the data to be transmitted.
The channel detection method according to claim 1, wherein after the ECCA channel detection process is turned on, the method further includes:

If the data to be transmitted arrives before the end of the ECCA channel detection process, the ECCA channel detection process is restarted at the end of the ECCA channel detection process or when the data to be transmitted arrives, and is restarted according to The detection result of the ECCA channel detection process determines whether to transmit the data to be transmitted.
The channel detecting method according to any one of claims 1 to 4, further comprising:

Defer period process is performed after any one channel occupancy time ends, and before the ECCA channel detection process is turned on;

In the ECCA channel detection process, if any ECCA detection granularity detects a channel If busy, the defer period process is executed after any of the ECCA detection granularities.
A channel detecting device, comprising:

a first determining unit, configured to determine, by the sender, whether the channel occupation time ends in the process of occupying the channel to transmit data;

And a processing unit, configured to: when the first determining unit determines that any channel occupancy time ends, turn on an ECCA channel detection process.
The channel detecting apparatus according to claim 6, further comprising: a second determining unit, configured to determine whether there is data to be transmitted when the ECCA channel detecting process ends;

The processing unit is further configured to: when the second determining unit determines that the data to be transmitted does not exist, control the sender to enter an idle state, and initiate ICCA channel detection when the data to be transmitted arrives process;

The channel detecting apparatus further includes: a first sending unit, configured to determine whether to send the data to be transmitted according to the detection result of the ICCA channel detecting process.
The channel detecting apparatus according to claim 6, further comprising:

a second sending unit, if the data to be transmitted already exists when the ECCA channel detecting process is turned on, or the data to be transmitted arrives before the end of the ECCA channel detecting process, after the end of the ECCA channel detecting process And determining, according to the detection result of the ECCA channel detection process, whether to send the data to be transmitted.
The channel detecting apparatus according to claim 6, wherein the processing unit is further configured to: when the data to be transmitted arrives before the end of the ECCA channel detecting process, at the end of the ECCA channel detecting process or Restarting the ECCA channel detection process when the data to be transmitted arrives;

The channel detecting apparatus further includes: a third sending unit, configured to determine whether to send the data to be transmitted according to the detection result of the restarted ECCA channel detecting process.
The channel detecting apparatus according to any one of claims 6 to 9, wherein the processing unit is further configured to:

Defer period process is performed after any one channel occupancy time ends, and before the ECCA channel detection process is turned on;

In the ECCA channel detection process, if any ECCA detection granularity detects that the channel is busy, the defer period process is performed after the ECCA detection granularity.