WO2017050055A1 - 一种竞争窗调整方法和装置 - Google Patents

一种竞争窗调整方法和装置 Download PDF

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Publication number
WO2017050055A1
WO2017050055A1 PCT/CN2016/094799 CN2016094799W WO2017050055A1 WO 2017050055 A1 WO2017050055 A1 WO 2017050055A1 CN 2016094799 W CN2016094799 W CN 2016094799W WO 2017050055 A1 WO2017050055 A1 WO 2017050055A1
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Prior art keywords
window length
window
decision threshold
lbt
metric
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PCT/CN2016/094799
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English (en)
French (fr)
Inventor
张晨晨
赵亚军
苟伟
仲丽媛
刘娟
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中兴通讯股份有限公司
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Publication of WO2017050055A1 publication Critical patent/WO2017050055A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance

Definitions

  • the present invention relates to a CW (Contending Windows) technology in the field of mobile wireless communications, and in particular, to a contention window adjustment method and apparatus.
  • CW Contending Windows
  • LTE Long Term Evolution
  • the unlicensed spectrum has the following characteristics and advantages:
  • Multi-services are mentioned to be operational in them, such as Machine to Machine (M2M), Vehicle to Vehicle (V2V).
  • M2M Machine to Machine
  • V2V Vehicle to Vehicle
  • the above basic characteristics determine that the unlicensed spectrum may be an important part of the wireless communication system.
  • the direction of evolution but at the same time there are many problems. For example, there will be a variety of wireless systems in the unlicensed spectrum, which are difficult to coordinate with each other and have serious interference.
  • an embodiment of the present invention provides a contention window adjustment method and apparatus.
  • the CW window length of the LBT process is increased according to the setting rule; when the Metric is less than or equal to the CW window length decision threshold, the LBT process is reduced according to a predetermined rule. The length of the CW window.
  • the CW window length decision threshold for determining the LBT process is as follows:
  • the above CW window length decision threshold is a predefined constant; or,
  • the CW window length decision threshold is a static or semi-static, or dynamic threshold associated with one or more of the following parameters: Quality of Service (QoS) level, traffic load condition, continuous maximum CWS duration, data to be transmitted Waiting for the transmission duration, system target reuse factor, transmission type is the first transmission or retransmission, the ratio of this transmission capacity to the cumulative transmission throughput.
  • QoS Quality of Service
  • the CW window length decision threshold is a static or semi-static or dynamic threshold associated with one or more of the following parameters, including:
  • the CW window length decision threshold is proportional to the above QoS level or a power exponential relationship
  • the above CW window length decision threshold is in a parabolic relationship with the above traffic load condition
  • the above CW window length decision threshold is in a power exponential relationship or a proportional relationship with the continuous maximum CWS duration
  • the CW window length decision threshold is proportional to the length of the data to be transmitted waiting for transmission
  • the CW window length decision threshold is dynamically adjusted according to the system target reuse factor
  • the CW window length decision threshold is dynamically adjusted according to whether the transmission type is first transmission or retransmission
  • the above CW window length decision threshold has a power exponential relationship or a proportional relationship with the ratio of the current transmission capacity to the cumulative transmission throughput.
  • the CW window length decision threshold for determining the LBT process is as follows:
  • the corresponding parameters are selected to determine the CW window length decision threshold of the LBT process.
  • the foregoing setting rule is:
  • the CW window length is increased according to a fixed multiple; or the CW window length is increased according to a non-fixed multiple; wherein the increased multiple is greater than the CW according to the Metric according to the site
  • the degree of the window length decision threshold is determined;
  • the CW window length is reduced according to a fixed multiple; or the CW window length is reduced according to a non-fixed multiple; wherein the reduced multiple is less than the Metric according to the Metric
  • the degree of the above CW window length decision threshold is determined.
  • the foregoing method further includes:
  • the CW window length is set to a minimum value, or is reduced by a predetermined multiple.
  • CCA Clear Channel Assessment
  • the CW window length is set to a random value satisfying the minimum and maximum limits.
  • the CW window length of the LBT process is determined in a plurality of manners, the CW window length of the LBT process is determined according to the configuration manner; the method further includes:
  • Radio resource control RRC
  • the handover is a non-periodic configuration or a periodic configuration, or according to a service transmission cluster ( Burst) configuration.
  • the calculating the metric according to the configuration according to the first information includes:
  • Metric is D, where D is the sum of the number of times the Defer period is entered during one or more LBTs before this LBT; or,
  • Metric is the division of D by N, where D is the sum of the number of times the Defer period is entered during one or more LBTs before the LBT, and N is the extended idle channel assessment (eCCA) experienced by the LBT before the LBT process.
  • eCCA extended idle channel assessment
  • Expend Clear Channel Assessment The total number of slots corresponding to the process; or,
  • Metric is the division of T by Y, where T is the length of time that the eCCA process channel experienced during one or more LBT processes before this LBT is busy, and Y is the eCCA experienced during one or more LBTs before this LBT. The length of time the process has gone through.
  • the foregoing method further includes:
  • the CW window length decision thresholds of the plurality of unlicensed carriers are the same or different.
  • the plurality of sites exchange CW adjustment information of each other through the X2 interface, where the CW adjustment information includes one or more of a CW window adjustment method, a threshold threshold, and a current or historical CWS value.
  • the foregoing method further includes:
  • the terminal is notified that the uplink time and frequency resources of the current CSI feedback are unavailable.
  • the CCA in the LBT process, is divided into an initial CCA phase and an extended CCA phase; in the initial CCA phase, the listening window length includes a random window length, or includes a fixed window length plus a random window length.
  • Determining a unit configured to determine a CW window length decision threshold of the LBT process when performing the LBT process
  • a calculating unit configured to calculate a metric according to the configured manner according to the first information
  • Comparing unit configured to compare the metric above with the CW window length decision threshold
  • the adjusting unit is configured to increase the CW window length of the LBT process according to the setting rule when the Metric is greater than the CW window length decision threshold; and when the Metric is less than or equal to the CW window length decision threshold, according to a predetermined rule Small CW window length of this LBT process.
  • the determining unit is further configured to determine the CW window length decision threshold according to the following manner: the CW window length decision threshold is a predefined constant; or the CW window length decision threshold is one or more of the following Static, or semi-static, or dynamic thresholds associated with parameters: QoS class, traffic load condition, continuous maximum CWS duration, data to be transmitted waiting for transmission, system target reuse factor, transmission type is first or retransmission, this Secondary pass The ratio of transmission capacity to cumulative transmission throughput.
  • the determining unit is further configured to determine the CW window length decision threshold according to the following manner: the CW window length decision threshold is proportional to the QoS level or a power exponential relationship; the CW window length decision threshold and the foregoing The traffic load condition is parabolic; the CW window length decision threshold is in a power exponential relationship or a proportional relationship with the continuous maximum CWS duration; the CW window length decision threshold is proportional to the length of the data to be transmitted waiting for transmission; the CW window length The decision threshold is dynamically adjusted according to the system target reuse factor; the CW window length decision threshold is dynamically adjusted according to whether the transmission type is first transmission or retransmission; and the ratio of the CW window length decision threshold to the current transmission capability and the cumulative transmission throughput A power exponential relationship or a proportional relationship.
  • the determining unit is further configured to: according to the value range of the parameter, select a corresponding parameter to determine a CW window length decision threshold of the LBT process.
  • the foregoing setting rule is:
  • the CW window length is increased according to a fixed multiple; or the CW window length is increased according to a non-fixed multiple; wherein the increased multiple is greater than the CW according to the Metric according to the site
  • the degree of the window length decision threshold is determined;
  • the CW window length is reduced according to a fixed multiple; or the CW window length is reduced according to a non-fixed multiple; wherein the reduced multiple is less than the Metric according to the Metric
  • the degree of the above CW window length decision threshold is determined.
  • the adjusting unit is further configured to set a CW window length to a minimum value when the data is to be transmitted, and when the waiting delay exceeds a predetermined threshold, in the next one or more CCAs, or The predetermined multiple reduces the CWS window length;
  • the CW window length is set to meet the minimum and maximum limits. A random value of the system.
  • the determining unit is further configured to determine a CW window length of the LBT process according to the configuration manner when the CW window length of the LBT process is determined in multiple manners;
  • the above device also includes:
  • the receiving unit is configured to receive the configuration mode sent by the base station by using the high-layer RRC signaling, and receive the notification message sent by the base station by using the high-layer RRC signaling, to notify the terminal to switch from one CW window length determination mode to another CW window length determination mode.
  • the handover is a non-periodic configuration or a periodic configuration, or is configured according to a service transmission cluster burst.
  • the calculating unit is further configured to calculate a Metric according to the following manner: Metric is D, where D is the sum of the number of times of entering the Defer period in the LBT process before or after the LBT; or, the Metric is D.
  • N is the total number of slots corresponding to the eCCA process experienced by the LBT one or more times before LBT; or Metric is the division of T by Y, where T is the length of time that the eCCA process channel experienced during one or more LBT processes before this LBT is busy, and Y is the eCCA experienced during one or more LBTs before this LBT. The length of time the process has gone through.
  • the determining unit is further configured to use the same CW window length determining manner or use different CW window length determining manners when performing LBT measurement in each unlicensed frequency band when using multiple unlicensed frequency bands.
  • the same CW window length determination mode is used on multiple unlicensed frequency bands, the above CW window length decision thresholds of multiple unlicensed carriers are the same or different.
  • the plurality of sites exchange CW adjustment information of each other through the X2 interface, where the CW adjustment information includes one or more of a CW window adjustment method, a threshold threshold, and a current or historical CWS value.
  • the device further includes: a notification unit, configured to notify the terminal that the uplink measurement time and the frequency resource of the CSI feedback are not available when the station fails to send the channel measurement pilot due to the downlink LBT failure for the unlicensed frequency band. use.
  • a notification unit configured to notify the terminal that the uplink measurement time and the frequency resource of the CSI feedback are not available when the station fails to send the channel measurement pilot due to the downlink LBT failure for the unlicensed frequency band. use.
  • the terminal is notified that the uplink time and frequency resources of the current CSI feedback are unavailable.
  • a computer storage medium is further provided, and the computer storage medium may store an execution instruction for executing the contention window adjustment method in the foregoing embodiment.
  • the CW window length decision threshold of the LBT process is determined; according to the first information, the metric is calculated according to the configured manner; and the metric and the CW window length decision threshold are performed. Comparing; when the above Metric is greater than the CW window length decision threshold, increasing the CW window length of the LBT process according to the setting rule; when the Metric is less than or equal to the CW window length decision threshold, reducing the current rule according to a predetermined rule The CW window length of the LBT process. In a variety of wireless systems with unlicensed spectrum, the CW window length is dynamically adjusted, reducing interference between systems.
  • FIG. 1 is a schematic flowchart of a method for adjusting a contention window according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a contention window adjusting apparatus according to an embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a method for adjusting a contention window according to an embodiment of the present invention. As shown in FIG. 1 , the method for adjusting a contention window includes the following steps:
  • Step 101 When performing the LBT process, determine a CW window length decision threshold of the LBT process.
  • the determining a CW window length decision threshold of the LBT process includes:
  • the CW window length decision threshold is a predefined constant; or,
  • the CW window length decision threshold is a static, or semi-static, or dynamic threshold associated with one or more of the following parameters: QoS level, traffic load condition, continuous maximum CWS duration, data to be transmitted waiting for transmission, system target complex
  • QoS level QoS level
  • traffic load condition traffic load condition
  • continuous maximum CWS duration data to be transmitted waiting for transmission
  • system target complex The factor, the transmission type is the first transmission or the retransmission, the ratio of the current transmission capacity to the cumulative transmission throughput.
  • the CW window length decision threshold is a static or semi-static, or dynamic threshold associated with one or more of the following parameters, including:
  • the CW window length decision threshold is in a proportional relationship or a power exponential relationship with the QoS level
  • the CW window length decision threshold is in a parabolic relationship with the traffic load condition
  • the CW window length decision threshold is in a power exponential relationship or a proportional relationship with the continuous maximum CWS duration
  • the CW window length decision threshold is proportional to the duration of the data to be transmitted waiting for transmission
  • the CW window length decision threshold is dynamically adjusted according to the system target reuse factor
  • the CW window length decision threshold is dynamically adjusted according to whether the transmission type is first transmission or retransmission
  • the CW window length decision threshold is in a power exponential relationship or a proportional relationship with the ratio of the current transmission capacity to the cumulative transmission throughput.
  • the CW window length decision threshold size is related to the QoS level and can be in a proportional relationship. The smaller the QoS level value is, the higher the service priority is, the higher the CW window length decision threshold is.
  • the CW window length decision threshold should be steeply increased, thereby ensuring the channel occupancy probability from the perspective of fairness for the site that uses the maximum CWS for a long time.
  • the CW window length decision threshold should be steeply increased, thereby ensuring that the site occupying the channel for a long time can improve the channel occupation probability from the perspective of fairness.
  • the system target reuse factor dynamically adjusts the CW window length decision threshold according to the target reuse factor site of the system, thereby ensuring system multiplexing requirements as much as possible.
  • different CW window length decision thresholds are used, for example, a higher CW window length decision threshold is used for retransmission, thereby realizing retransmission priority.
  • the CW window length decision threshold calculation is affected. For example, when the ratio is large, the CW window length decision threshold may be appropriately increased. When the ratio is small, the ratio may be appropriately reduced.
  • the CW window length decision threshold so that the CW window length decision threshold can be selected to take into account the system fairness and the transmission capacity of different sites.
  • a segmentation mode may be adopted, that is, when one or more related parameters are in the interval 1, the method 1 is used to calculate the CW window length decision threshold, in one or more When the relevant parameters are in interval 2, method 2 is used to calculate the CW window length decision threshold, and so on, and so on.
  • the determining a CW window length decision threshold of the LBT process includes:
  • the corresponding parameter is selected to determine the CW window length decision threshold of the LBT process.
  • the setting rule is:
  • the CW window length is increased according to a fixed multiple; or the CW window length is increased according to a non-fixed multiple; wherein the increased multiple is determined by the site The extent to which the metric is greater than the CW window length decision threshold is determined;
  • the CW window length is decreased according to a fixed multiple; or the CW window length is decreased according to a non-fixed multiple; wherein the reduced multiple is The station determines based on the extent to which the Metric is less than the CW window length decision threshold.
  • the CW window length is increased, and the specific increase method may be increased by a fixed multiple, for example, 1.5 times, 2 times, 2.5 times, 3 times, and the like; It can also be increased according to a non-fixed multiple. It is determined by the station to increase the multiple each time, and different multiple intervals can be divided according to the degree that the metric is greater than the CW window length decision threshold.
  • the CW window length is reduced.
  • the specific reduction method may be a fixed multiple, for example, 1/1.5 times, 1/2 times, 1/2.5 times, 1/3 times. Etc.; can also be reduced according to a non-fixed multiple, the site determines each time to reduce the multiple, according to the extent that the Metric is less than the CW window length decision threshold, different multiple intervals.
  • Step 102 Calculate the metric according to the configured manner according to the first information.
  • the calculating the metric according to the configuration according to the first information includes:
  • Metric is D, where D is the sum of the number of times of entering the Defer period during one or more LBTs before the LBT; or
  • Metric is the division of D by N, where D is one or more LBT processes before this LBT.
  • D is one or more LBT processes before this LBT.
  • N is the total number of slot slots corresponding to the extended idle channel evaluation eCCA process experienced by the LBT before one or more LBT processes;
  • Metric is the division of T by Y, where T is the length of time that the eCCA process channel experienced during one or more LBT processes before this LBT is busy, and Y is the eCCA experienced during one or more LBTs before this LBT. The length of time the process has gone through.
  • the first information is historical sensing information:
  • the base station performs CW selection according to the previous historical CCA process, and may determine the CWS performed by the K+1th LBT according to the preemption parameter in the one or more LBT execution processes before the Kth and/or Kth. Specifically, there are the following parameters:
  • the extended channel evaluated eCA process channel is busy for a length of time T;
  • the extended channel is evaluated to evaluate the number of slots N corresponding to the eCCA process, that is, how many slots the entire eCCA duration can be divided into.
  • the extended channel experienced eCA process elapses over the length of time Y;
  • D, T, N, and Y are integers.
  • Step 103 Compare the metric with the CW window length decision threshold.
  • Step 104 When the Metric is greater than the CW window length decision threshold, increase the CW window length of the LBT process according to the setting rule; when the Metric is less than or equal to the CW window length decision threshold, according to the predetermined The rule reduces the CW window length of this LBT process.
  • the CW window length is set to a minimum value, or is reduced by a predetermined multiple.
  • the CW window length is set to a random value that satisfies the minimum and maximum limits.
  • the CW window length is set to a minimum value in the next one or several times of CCA, or The CW window length is reduced by a certain multiple, thereby increasing the probability of the station preempting the channel.
  • the CW window length is set to a random value that satisfies the minimum and maximum limits.
  • the CW window length of the LBT process is determined in a plurality of manners, the CW window length of the LBT process is determined according to the configuration manner; the method further includes:
  • the window length determining mode is switched to another CW window length determining mode; wherein the switching is a non-periodic configuration or a periodic configuration, or configured according to a service transmission cluster burst.
  • the CW window length determination mode of the static or semi-static configuration on the network side can be configured in the manner of OAM (Operation Administration and Maintenance), and the specific configuration mode of the terminal is notified through high-layer RRC signaling.
  • Semi-static or dynamic switching can be implemented between multiple CW window length determination modes.
  • the high-level RRC signaling can be used to notify the terminal to switch from one CW window length determination mode to another CW window length determination mode.
  • the handover may be a non-periodic configuration or a periodic configuration, or may be configured according to a service transmission cluster burst, for example, switching from one CW window length determination manner to another CW window length determination manner after completing one or more burst transmissions,
  • the terminal can be notified by high layer RRC signaling or dynamic DCI signaling.
  • the method further includes:
  • the CW window length decision thresholds of the plurality of unlicensed carriers are the same or different.
  • the station or the terminal may use one or more unlicensed frequency bands for transmission.
  • the same CW window length adjustment method may be used when performing LBT measurement in each unlicensed frequency band, or may be used.
  • Different CW window adjustment methods, which CW window adjustment method is used on each unlicensed frequency band can be semi-statically configured by higher layer RRC signaling.
  • multiple unlicensed carriers may be the same or different, and the upper layer RRC signaling is semi-static. State configuration, or dynamically configured by Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the interaction between the sites may exchange CW adjustment information of each other through the X2 interface, and the CW adjustment information includes one or more of a CW window adjustment method, a threshold threshold, and a current or historical CWS value.
  • the terminal is notified that the uplink time and frequency resources of the current CSI feedback are unavailable.
  • the terminal needs to notify the terminal that the uplink time and the frequency resource of the current CSI feedback are unavailable.
  • the following notification method may be used: 1) the base station The dynamic control signaling is used on the authorized carrier, which can be specifically carried in the DL format of the PDCCH; 2) the base station notifies the dynamic control signaling on the unlicensed carrier.
  • the uplink time and frequency resources of the feedback CSI may be resources on the licensed frequency band or resources on the unlicensed frequency band.
  • the purpose of notifying the above information is that the terminal may misdetect the CSI information due to the blind detection error, and feed back the error CSI on the uplink time and frequency resources that the base station considers that the terminal is unavailable.
  • the CCA is divided into an initial CCA phase and an extended CCA phase; in the initial CCA phase, the listening window length includes a random window length, or includes a fixed window length plus a random window length.
  • the listening window length of the initial CCA phase may include only one.
  • the length of the random window is either a fixed window length or a random window length.
  • the specific random window length can be n ⁇ unit. According to different application scenarios, n can have different ranges.
  • the unit is unit length. It can be used in different application scenarios. Different values, or all Take a fixed value in the application scenario.
  • the CW window length decision threshold is a static or semi-statically configured constant, and the specific Metric calculation has the following methods:
  • the network side notifies the terminal specific metric calculation method and the specific decision threshold constant through high-level RRC signaling.
  • the CW window length decision threshold is a dynamic or semi-static threshold associated with several factors.
  • the threshold can be determined in the following ways:
  • Threshold Function (QoS level), where Threshold Threshold represents a threshold Threshold, and Function() represents a function of an argument in parentheses.
  • the QoS level indicates the priority of the data that the LBT wants to send, and the QoS level is set from 1 to 16 in order.
  • the priority is from high to low, then the specific Function can be an addition equation, where the QoS level is one of the input addends; the specific Function can also be a multiplication equation or an exponential equation, where the QoS level is an input multiplier or Enter one of the exponential powers.
  • Threshold Function (load condition), where the load condition refers to the service load level of the node performing the LBT in the current or recent period of time, which may be a low load, a medium load or a high load, and the specific Function may be It is a parabolic function that makes the load size nonlinear with Threshold. For example, under low load and high load, the Threshold is low, while under medium load, the Threshold is higher.
  • Threshold Function (maximum CWS duration), where the maximum CWS duration means that in the previous LBT process, each LBT will determine a CW value, if the CW value in multiple consecutive LBTs is Select the maximum value in the range, then the length of time that this LBT lasts, in microseconds or milliseconds.
  • a specific Function can be a multiplication equation or an exponential equation in which the maximum CWS duration is one of the input multiplier or the input exponential power.
  • threshold Threshold Function (data to be transmitted waiting for transmission duration), wherein the data to be transmitted is waiting for the transmission duration, indicating that a certain station or terminal has a service reaching the medium access control (MAC) layer at time t1, but because The reason for scheduling or the reason for the LBT contention channel is that the service is not immediately transmitted. After the service is transmitted at time t2, the time period t2-t1 is the waiting time for the data to be transmitted.
  • the specific Function may be an addition equation or a multiplication equation, wherein the data to be transmitted waiting for transmission is one of the input addends or multipliers.
  • threshold Threshold Function (system target reuse factor), wherein the system target reuse factor is a quantization of the unlicensed band reuse condition of the cell or sector in the system, and the specific Function may not be limited to an equation when the system When the target reuse factor is large, Function The result is a higher threshold Threshold; when the system target reuse factor is small, the result of the Function is to obtain a lower threshold Threshold.
  • the transmission type is the first transmission data
  • Threshold is obtained;
  • Threshold is retransmitted data, the result of the Function is to obtain a higher threshold Threshold.
  • threshold Threshold Function (the ratio of the current transmission capacity to the cumulative transmission throughput), wherein the ratio of the current transmission capacity to the cumulative transmission throughput, the current transmission capability, specifically refers to the pre-scheduled, site or
  • the terminal can utilize the throughput or spectrum efficiency that can be achieved by performing an unlicensed band of LBT.
  • the specific Function may be an addition equation or a multiplication equation or an exponential power equation, wherein the ratio of the current transmission capacity to the cumulative transmission throughput may be one of an addend or a multiplier or a power exponent.
  • Threshold Threshold the proportion of terminal feedback NACK in the observation window, for example 1% or 5% or 10%.
  • the observation window may be the first subframe or the last subframe of the scheduling terminal in one or more busts before the LBT, or an odd subframe or an even subframe.
  • Threshold it may be any one of the above methods, or a combination of a plurality of methods.
  • the Metric value is compared with the threshold Threshold. If the Metric value is greater than the threshold Threshold, the station can adjust the current method in the following two ways.
  • CW value of LBT LBT
  • Method 1 Increase the CW value of the LBT according to a fixed multiple.
  • the CW value of the LBT can be 1.5 times, 2 times, 2.5 times, 3 times, etc. of the previous LBT CW value. Multiple relationship.
  • Method 2 Dynamically determine how many times the CW value of the LBT is increased according to the degree that the Metric value is greater than the threshold Threshold, for example, the value of Metric-Threshold or Metric/Threshold and the interval [a1, a2], [a2, a3], [a3, a4], ... comparison, when the value falls within a certain interval, the CW value of the LBT increases the multiple corresponding to the interval, and the corresponding multiple of each interval is different.
  • Threshold for example, the value of Metric-Threshold or Metric/Threshold and the interval [a1, a2], [a2, a3], [a3, a4], ... comparison, when the value falls within a certain interval, the CW value of the LBT increases the multiple corresponding to the interval, and the corresponding multiple of each interval is different.
  • the station may reduce the CW value of the LBT according to Method 1 and Method 2 above, except that the increase in Method 1 and Method 2 is correspondingly changed to decrease.
  • the site wants to use multiple unlicensed carriers, so LBT needs to be performed on multiple unlicensed carriers.
  • the network side separately configures the CW window length adjustment method and the corresponding threshold threshold determination method for each carrier through RRC signaling.
  • the configuration on each carrier is a semi-static configuration. After reconfiguration, the network side notifies the new configuration through RRC signaling. If the configurations on the respective carriers are the same, RRC signaling only informs one configuration method.
  • the downlink LBT of the downlink subframe k of a certain station fails.
  • the original station sends the channel measurement pilot on the subframe k.
  • the station cannot transmit the pilot, and thus the terminal also This channel estimation cannot be performed.
  • the terminal has received the aperiodic CSI feedback request corresponding to the channel estimation in the subframe k on the subframe m.
  • the terminal performs the aperiodic CSI feedback according to the time and frequency resources indicated in the request, but because the subframe k The channel measurement pilot cannot be transmitted as scheduled, so the base station needs to notify the terminal that the CSI feedback indicated by the subframe m is no longer performed, and the base station can pass the PDCCH on the authorized carrier or the unlicensed carrier.
  • the DL format is increased by 1 or greater than 1 bit to indicate that the non-periodic feedback time-frequency resource corresponding to the terminal is released without feedback.
  • the initial CCA phase includes a fixed window. Length + random window length, the specific random window length is n*slot, and n is a random integer less than or equal to 7.
  • FIG. 2 is a schematic structural diagram of a contention window adjusting apparatus according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes:
  • the determining unit 21 is configured to determine a CW window length decision threshold of the LBT process when the LBT process is performed;
  • the calculating unit 22 is configured to calculate the metric according to the configured manner according to the first information
  • Comparing unit 23 configured to compare the metric with the CW window length decision threshold
  • the adjusting unit 24 is configured to increase the CW window length of the LBT process according to the setting rule when the metric is greater than the CW window length decision threshold; and when the metric is less than or equal to the CW window length decision threshold The CW window length of the LBT process is reduced according to a predetermined rule.
  • the determining unit 21 is further configured to determine the CW window length decision threshold according to the following manner: the CW window length decision threshold is a predefined constant; or the CW window length decision threshold is Static, or semi-static, or dynamic threshold associated with one or more of the following parameters: QoS class, traffic load condition, continuous maximum CWS duration, data to be transmitted waiting for transmission, system target reuse factor, transmission type is the first pass Still retransmission, this pass The ratio of transmission capacity to cumulative transmission throughput.
  • the determining unit 21 is further configured to determine, according to the manner, the CW window length decision threshold: the CW window length decision threshold is proportional to the QoS level or a power exponential relationship; the CW The window length decision threshold is in a parabolic relationship with the traffic load condition; the CW window length decision threshold is in a power exponential relationship or a proportional relationship with the continuous maximum CWS duration; the CW window length decision threshold and the to-be-transmitted data Waiting for the transmission duration to be in a proportional relationship; the CW window length decision threshold is dynamically adjusted according to the system target reuse factor; the CW window length decision threshold is dynamically adjusted according to whether the transmission type is first transmission or retransmission; the CW window The long decision threshold is in a power exponential relationship or a proportional relationship with the ratio of the current transmission capacity to the cumulative transmission throughput.
  • the determining unit 21 is further configured to: according to the value range of the parameter, select a corresponding parameter to determine a CW window length decision threshold of the LBT process.
  • the setting rule is:
  • the CW window length is increased according to a fixed multiple; or the CW window length is increased according to a non-fixed multiple; wherein the increased multiple is determined by the site The extent to which the metric is greater than the CW window length decision threshold is determined;
  • the CW window length is decreased according to a fixed multiple; or the CW window length is decreased according to a non-fixed multiple; wherein the reduced multiple is The station determines based on the extent to which the Metric is less than the CW window length decision threshold.
  • the adjusting unit 24 is further configured to set the CW window length to a minimum value in the next one or more CCAs when there is data to be transmitted and the waiting delay exceeds a predetermined threshold. Or reducing the CWS window length by a predetermined multiple;
  • the CW window length is set to meet the minimum and maximum limits. A random value of the system.
  • the determining unit 21 is further configured to determine the CW window length of the LBT process according to the configuration manner when there are multiple ways to determine the CW window length of the LBT process.
  • the device also includes:
  • the receiving unit is configured to receive the configuration mode sent by the base station by using the high-layer RRC signaling, and receive the notification message sent by the base station by using the high-layer RRC signaling, to notify the terminal to switch from one CW window length determination mode to another CW window length determination mode.
  • the handover is a non-periodic configuration or a periodic configuration, or is configured according to a service transmission cluster burst.
  • the calculating unit 22 is further configured to calculate a Metric according to the following manner: Metric is D, where D is the sum of the times of entering the Defer period in the LBT process before or after the LBT; or, Metric Divide D by N, where D is the sum of the number of times the Defer period is entered during one or more LBTs before the LBT, and N is the total number of slots corresponding to the eCCA process experienced by the LBT before one or more LBT processes; Or, the metric is T divided by Y, where T is the length of time that the eCCA process channel experienced during one or more LBT processes before the LBT is busy, and Y is experienced during one or more LBT processes before the LBT. The length of time the eCCA process has gone through.
  • the determining unit 21 is further configured to use the same CW window length determination mode or use different CW window lengths when performing LBT measurement in each unlicensed frequency band when using multiple unlicensed frequency bands. Determining mode; when the same CW window length determination mode is used on multiple unlicensed frequency bands, the CW window length decision thresholds of multiple unlicensed carriers are the same or different.
  • a plurality of sites exchange CW adjustment information of each other through an X2 interface, where the CW adjustment information includes one or more of a CW window adjustment method, a threshold threshold, and a current or historical CWS value.
  • the device further includes: a notification unit 25, configured to notify, when the station fails to send the channel measurement pilot due to the downlink LBT failure for the unlicensed frequency band, notifying the terminal that the uplink resource and the frequency resource are unavailable according to the current CSI feedback.
  • a notification unit 25 configured to notify, when the station fails to send the channel measurement pilot due to the downlink LBT failure for the unlicensed frequency band, notifying the terminal that the uplink resource and the frequency resource are unavailable according to the current CSI feedback.
  • the CCA is divided into an initial CCA phase and an extended CCA phase; in the initial CCA phase, the listening window length includes a random window length, or includes a fixed window length plus a random window length.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the CW window length decision threshold of the LBT process is determined; according to the first information, the metric is calculated according to the configured manner; and the metric and the CW window length decision threshold are performed. Comparing; when the above Metric is greater than the CW window length decision threshold, increasing the CW window length of the LBT process according to the setting rule; when the Metric is less than or equal to the CW window length decision threshold, reducing the current rule according to a predetermined rule The CW window length of the LBT process. In a variety of wireless systems with unlicensed spectrum, the CW window length is dynamically adjusted, reducing interference between systems.

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Abstract

本发明实施例公开了一种竞争窗调整方法和装置，包括：在执行LBT过程时，确定本次LBT过程的CW窗长判决门限；根据第一信息，按照配置的方式计算Metric；将Metric与CW窗长判决门限进行比较；当Metric大于CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当Metric小于或等于CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。

Description

一种竞争窗调整方法和装置 技术领域
本发明涉及移动无线通信领域中的竞争窗(CW，Contending Windows)技术，尤其涉及一种竞争窗调整方法和装置。
背景技术
目前，长期演进(LTE，Long Term Evolution)是部署在授权载波中运营的。但是，随着数据业务的快速增长，在不久的将来，授权频谱将不能再承受下如此巨大的数据量。因此，需要在非授权频谱中部署LTE，通过非授权频谱来分担授权载波中的数据流量。
另外，对于非授权频谱，也是存在很多优势的。例如，非授权频谱具有下面的特征和优势：
1、免费/低费用：不需要购买非频谱，频谱资源为零成本。
2、准入要求低，成本低：个人、企业都可以参与部署，设备商的设备可以任意。
3、共享资源：多个不同系统都运营其中时或者同一系统的不同运营商运营其中时，可以考虑一些共享资源的方式，提高频谱效率。
4、无线接入技术多：跨不同的通信标准，协作难，网络拓扑多样。
5、无线接入站点多：用户数量大，协作难度大，集中式管理开销大。
6、应用多：多业务被提及可以在其中运营，例如机器到机器(M2M，Machine to machine)、车辆到车辆(V2V，Vehicle to vehicle)。
上述的基本特征，决定了非授权频谱可能是无线通信系统一个重要的 演进方向，但是同时也存在诸多问题。例如，非授权频谱中将存在各种各样的无线系统，彼此之间难于协调，干扰严重。
发明内容
为解决上述技术问题，本发明实施例提供了一种竞争窗调整方法和装置。
本发明实施例提供的竞争窗调整方法包括：
在执行先听后说(LBT，Listen Before Talk)过程时，确定本次LBT过程的CW窗长判决门限；
根据第一信息，按照配置的方式计算值(Metric)；
将上述Metric与上述CW窗长判决门限进行比较；
当上述Metric大于上述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当上述Metric小于或等于上述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。
本发明实施例中，上述确定本次LBT过程的CW窗长判决门限，包括：
上述CW窗长判决门限为预定义的常量；或者，
上述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值：服务质量(QoS，Quality of Service)等级、业务负载情况、连续最大CWS持续时间、待传输数据等待发送时长、系统目标复用因子、传输类型是首传还是重传、本次传输能力与累积传输吞吐量之比。
本发明实施例中，上述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值，包括：
上述CW窗长判决门限与上述QoS级别呈正比例关系或幂指数关系；
上述CW窗长判决门限与上述业务负载情况呈抛物线关系；
上述CW窗长判决门限与上述连续最大CWS持续时间呈幂指数关系或正比例关系；
上述CW窗长判决门限与上述待传输数据等待发送时长呈正比例关系；
上述CW窗长判决门限根据上述系统目标复用因子动态调整；
上述CW窗长判决门限根据上述传输类型是首传还是重传动态调整；
上述CW窗长判决门限与上述本次传输能力与累积传输吞吐量之比呈幂指数关系或正比例关系。
本发明实施例中，上述确定本次LBT过程的CW窗长判决门限，包括：
根据上述参数的取值范围，选择相应的参数确定本次LBT过程的CW窗长判决门限。
本发明实施例中，上述设定规则，为：
当上述Metric大于上述CW窗长判决门限时，按照固定的倍数增大上述CW窗长；或者，按照非固定的倍数增大上述CW窗长；其中，增大的倍数由站点根据Metric大于上述CW窗长判决门限的程度进行确定；
当上述Metric小于或等于上述CW窗长判决门限时，按照固定的倍数减小上述CW窗长；或者，按照非固定的倍数减小上述CW窗长；其中，减小的倍数由站点根据Metric小于上述CW窗长判决门限的程度进行确定。
本发明实施例中，上述方法还包括：
当有数据要传输时，并且等待时延超过预定门限时，在接下来的一次或多次空闲信道评估(CCA，Clear Channel Assessment)中，设置CW窗长为最小值，或者以预定倍数减小CWS窗长；
当在一段预定时长内没有数据传输时，上述时长超过预定时长门限时，在接下来的一次或多次CCA中，设置CW窗长为满足最小值与最大值限制的一个随机值。
本发明实施例中，当具有多种方式确定本次LBT过程的CW窗长时，按照配置方式确定本次LBT过程的CW窗长；上述方法还包括：
通过高层无线资源控制(RRC，Radio Resource Control)信令接收基站发送的配置方式；
通过高层RRC信令接收基站发送的通知消息，以通知终端从一种CW窗长确定方式切换到另一种CW窗长确定方式；其中，切换是非周期配置或周期配置，或者根据业务传输簇(burst)配置。
本发明实施例中，上述根据第一信息，按照配置的方式计算Metric，包括：
Metric为D，其中D是本次LBT之前一次或多次LBT过程中进入延迟期(Defer period)的次数之和；或者，
Metric为D除以N，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和，N是LBT之前一次或多次LBT过程中所经历的扩展空闲信道评估(eCCA，expend Clear Channel Assessment)过程对应的时隙(slot)总数目；或者，
Metric为T除以Y，其中T是本次LBT之前一次或多次LBT过程中所经历的eCCA过程信道为忙的时间长度，Y是本次LBT之前一次或多次LBT过程中所经历的eCCA过程经历的时间长度。
本发明实施例中，上述方法还包括：
在使用多个非授权频段时，在各个非授权频段进行LBT测量时，使用相同的CW窗长确定方式，或者使用不同的CW窗长确定方式；
当在多个非授权频段上使用相同的CW窗长确定方式时，多个非授权载波的上述CW窗长判决门限相同，或者不同。
本发明实施例中，多个站点之间通过X2接口交互彼此的CW调整信息，上述CW调整信息包括：CW窗调整方法、门限阈值、当前或历史CWS值中的一种或多种信息。
本发明实施例中，上述方法还包括：
对于非授权频段，当站点因下行LBT失败而无法发送信道测量导频时，通知终端对应本次CSI反馈的上行时、频资源不可用。
本发明实施例中，在LBT过程中，将CCA分为初始CCA阶段和扩展CCA阶段；在初始CCA阶段，侦听窗长包括一个随机窗长，或者包括一个固定窗长加随机窗长。
本发明实施例提供的竞争窗调整装置包括：
确定单元，设置为在执行LBT过程时，确定本次LBT过程的CW窗长判决门限；
计算单元，设置为根据第一信息，按照配置的方式计算Metric；
比较单元，设置为将上述Metric与上述CW窗长判决门限进行比较；
调整单元，设置为当上述Metric大于上述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当上述Metric小于或等于上述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。
本发明实施例中，上述确定单元，还设置为按照如下方式确定上述CW窗长判决门限：上述CW窗长判决门限为预定义的常量；或者，上述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值：QoS等级、业务负载情况、连续最大CWS持续时间、待传输数据等待发送时长、系统目标复用因子、传输类型是首传还是重传、本次传 输能力与累积传输吞吐量之比。
本发明实施例中，上述确定单元，还设置为按照如下方式确定上述CW窗长判决门限：上述CW窗长判决门限与上述QoS级别呈正比例关系或幂指数关系；上述CW窗长判决门限与上述业务负载情况呈抛物线关系；上述CW窗长判决门限与上述连续最大CWS持续时间呈幂指数关系或正比例关系；上述CW窗长判决门限与上述待传输数据等待发送时长呈正比例关系；上述CW窗长判决门限根据上述系统目标复用因子动态调整；上述CW窗长判决门限根据上述传输类型是首传还是重传动态调整；上述CW窗长判决门限与上述本次传输能力与累积传输吞吐量之比呈幂指数关系或正比例关系。
本发明实施例中，上述确定单元，还设置为根据上述参数的取值范围，选择相应的参数确定本次LBT过程的CW窗长判决门限。
本发明实施例中，上述设定规则，为：
当上述Metric大于上述CW窗长判决门限时，按照固定的倍数增大上述CW窗长；或者，按照非固定的倍数增大上述CW窗长；其中，增大的倍数由站点根据Metric大于上述CW窗长判决门限的程度进行确定；
当上述Metric小于或等于上述CW窗长判决门限时，按照固定的倍数减小上述CW窗长；或者，按照非固定的倍数减小上述CW窗长；其中，减小的倍数由站点根据Metric小于上述CW窗长判决门限的程度进行确定。
本发明实施例中，上述调整单元，还设置为当有数据要传输时，并且等待时延超过预定门限时，在接下来的一次或多次CCA中，设置CW窗长为最小值，或者以预定倍数减小CWS窗长；
当在一段预定时长内没有数据传输时，上述时长超过预定时长门限时，在接下来的一次或多次CCA中，设置CW窗长为满足最小值与最大值限 制的一个随机值。
本发明实施例中，上述确定单元，还设置为当具有多种方式确定本次LBT过程的CW窗长时，按照配置方式确定本次LBT过程的CW窗长；
上述装置还包括：
接收单元，设置为通过高层RRC信令接收基站发送的配置方式；通过高层RRC信令接收基站发送的通知消息，以通知终端从一种CW窗长确定方式切换到另一种CW窗长确定方式；其中，切换是非周期配置或周期配置，或者根据业务传输簇burst配置。
本发明实施例中，上述计算单元，还设置为按照如下方式计算Metric：Metric为D，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和；或者，Metric为D除以N，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和，N是LBT之前一次或多次LBT过程中所经历的eCCA过程对应的slot总数目；或者，Metric为T除以Y，其中T是本次LBT之前一次或多次LBT过程中所经历的eCCA过程信道为忙的时间长度，Y是本次LBT之前一次或多次LBT过程中所经历的eCCA过程经历的时间长度。
本发明实施例中，上述确定单元，还设置为在使用多个非授权频段时，在各个非授权频段进行LBT测量时，使用相同的CW窗长确定方式，或者使用不同的CW窗长确定方式；当在多个非授权频段上使用相同的CW窗长确定方式时，多个非授权载波的上述CW窗长判决门限相同，或者不同。
本发明实施例中，多个站点之间通过X2接口交互彼此的CW调整信息，上述CW调整信息包括：CW窗调整方法、门限阈值、当前或历史CWS值中的一种或多种信息。
本发明实施例中，上述装置还包括：通知单元，设置为对于非授权频段，当站点因下行LBT失败而无法发送信道测量导频时，通知终端对应本次CSI反馈的上行时、频资源不可用。
本发明实施例中，对于非授权频段，当站点因下行LBT失败而无法发送信道测量导频时，通知终端对应本次CSI反馈的上行时、频资源不可用。
在本发明实施例中，还提供了一种计算机存储介质，该计算机存储介质可以存储有执行指令，该执行指令用于执行上述实施例中的竞争窗调整方法。
本发明实施例的技术方案中，在执行LBT过程时，确定本次LBT过程的CW窗长判决门限；根据第一信息，按照配置的方式计算Metric；将上述Metric与上述CW窗长判决门限进行比较；当上述Metric大于上述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当上述Metric小于或等于上述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。在非授权频谱各种各样的无线系统中，动态调整了CW窗长，降低了各个系统之间的干扰。
附图说明
图1为本发明实施例的竞争窗调整方法的流程示意图；
图2为本发明实施例的竞争窗调整装置的结构组成示意图。
具体实施方式
为了能够更加详尽地了解本发明实施例的特点与技术内容，下面结合附图对本发明实施例的实现进行详细阐述，所附附图仅供参考说明之用， 并非用来限定本发明实施例。
图1为本你发明实施例的竞争窗调整方法的流程示意图，如图1所示，所述竞争窗调整方法包括以下步骤：
步骤101：在执行LBT过程时，确定本次LBT过程的CW窗长判决门限。
本发明实施例中，所述确定本次LBT过程的CW窗长判决门限，包括：
所述CW窗长判决门限为预定义的常量；或者，
所述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值：QoS等级、业务负载情况、连续最大CWS持续时间、待传输数据等待发送时长、系统目标复用因子、传输类型是首传还是重传、本次传输能力与累积传输吞吐量之比。
上述方案中，所述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值，包括：
所述CW窗长判决门限与所述QoS级别呈正比例关系或幂指数关系；
所述CW窗长判决门限与所述业务负载情况呈抛物线关系；
所述CW窗长判决门限与所述连续最大CWS持续时间呈幂指数关系或正比例关系；
所述CW窗长判决门限与所述待传输数据等待发送时长呈正比例关系；
所述CW窗长判决门限根据所述系统目标复用因子动态调整；
所述CW窗长判决门限根据所述传输类型是首传还是重传动态调整；
所述CW窗长判决门限与所述本次传输能力与累积传输吞吐量之比呈幂指数关系或正比例关系。
这里，QoS级别越高，则表示业务优先级越高，那么CW窗长判决门限应该越高，即使CW更容易减小，从而提高信道占用概率。CW窗长判决门限大小与QoS级别有关，可以呈正比例关系，QoS级别数值越小，表示业务优先级越高，则CW窗长判决门限越高。
业务负载情况与CW窗长判决门限之间可能不是线性关系，可以是开口朝上的抛物线关系。
连续最大CWS持续时间，当该值大于某个极限时，CW窗长判决门限应该陡增，从而保证对于长期使用最大CWS的站点，从公平性角度出发，提高信道占用概率。
当站点或终端有数据要传输，等待发送时长大于某个极限时，CW窗长判决门限应该陡增，从而保证对于长期无法抢占到信道的站点，从公平性角度出发，提高信道占用概率。
系统目标复用因子，根据该系统目标复用因子站点动态调整CW窗长判决门限，从而尽可能保证系统复用要求。
根据传输类型是首传还是重传，采用不同的CW窗长判决门限，例如对重传采用更高的CW窗长判决门限，从而实现重传优先。
根据本次传输能力与累积传输吞吐量之比，来影响CW窗长判决门限计算，例如当该比值较大时，可以适当增大CW窗长判决门限，当该比值较小时，可以适当减小CW窗长判决门限，从而使CW窗长判决门限的选择可以兼顾考虑系统公平性以及不同站点的传输能力。
本发明实施例中，对于CW窗长判决门限的设计，可以采用分段方式，即在一个或多个相关参数处于区间1时，采用方法1来计算CW窗长判决门限，在一个或多个相关参数处于区间2时，采用方法2来计算CW窗长判决门限，等等，以此类推。
上述方案中，所述确定本次LBT过程的CW窗长判决门限，包括：
根据所述参数的取值范围，选择相应的参数确定本次LBT过程的CW窗长判决门限。
本发明实施例中，所述设定规则，为：
当所述Metric大于所述CW窗长判决门限时，按照固定的倍数增大所述CW窗长；或者，按照非固定的倍数增大所述CW窗长；其中，增大的倍数由站点根据Metric大于所述CW窗长判决门限的程度进行确定；
当所述Metric小于或等于所述CW窗长判决门限时，按照固定的倍数减小所述CW窗长；或者，按照非固定的倍数减小所述CW窗长；其中，减小的倍数由站点根据Metric小于所述CW窗长判决门限的程度进行确定。
具体地，当计算出的Metric大于CW窗长判决门限时，增大CW窗长，具体增大方法可以按照固定的倍数来增大，例如1.5倍、2倍、2.5倍、3倍等等；也可以按照非固定的倍数来增大，由站点决定每次增大倍数，可以根据Metric大于CW窗长判决门限的程度，划分不同的倍数区间。
当计算出的Metric不大于CW窗长判决门限时，减小CW窗长，具体减小方法可以按照固定的倍数，例如1/1.5倍、1/2倍、1/2.5倍、1/3倍等等；也可以按照非固定的倍数来减小，由站点决定每次减小倍数，可以根据Metric小于CW窗长判决门限的程度，划分不同的倍数区间。
步骤102：根据第一信息，按照配置的方式计算Metric。
本发明实施例中，所述根据第一信息，按照配置的方式计算Metric，包括：
Metric为D，其中D是本次LBT之前一次或多次LBT过程中进入延迟期Defer period的次数之和；或者，
Metric为D除以N，其中D是本次LBT之前一次或多次LBT过程中 进入Defer period的次数之和，N是LBT之前一次或多次LBT过程中所经历的扩展空闲信道评估eCCA过程对应的时隙slot总数目；或者，
Metric为T除以Y，其中T是本次LBT之前一次或多次LBT过程中所经历的eCCA过程信道为忙的时间长度，Y是本次LBT之前一次或多次LBT过程中所经历的eCCA过程经历的时间长度。
具体地，第一信息为历史感知信息：
基站根据之前的历史CCA过程来进行CW选择，可以根据第K次和/或第K次前的一次或多次LBT执行过程中的抢占参数，来确定第K+1次LBT执行的CWS。具体地，有以下参数：
第K次和/或第K次前的一次或多次LBT执行期间进入Defer period的次数D；
第K次和/或第K次前的一次或多次LBT执行期间，所经历的扩展信道评估eCCA过程信道为忙的时间长度T；
第K次和/或第K次前的一次或多次LBT执行期间，所经历的扩展信道评估eCCA过程对应的slot数目N，即整个eCCA持续期间可以划分为多少个slot。
第K次和/或第K次前的一次或多次LBT执行期间，所经历的扩展信道评估eCCA过程经历的时间长度Y；
其中，D、T、N、Y均为整数。
将所述进入Defer period的次数D与第一次数阈值比较，根据比较结果确定第K+1次LBT执行时对应的竞争回退窗的范围；
将所述D/N与第一比例阈值比较，根据比较结果确定第K+1次LBT执行时对应的竞争回退窗的范围；
将所述T/Y与第二比例阈值比较，根据比较结果确定第K+1次LBT 执行时对应的竞争回退窗的范围。
步骤103：将所述Metric与所述CW窗长判决门限进行比较。
步骤104：当所述Metric大于所述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当所述Metric小于或等于所述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。
本发明实施例中，当有数据要传输时，并且等待时延超过预定门限时，在接下来的一次或多次空闲信道评估CCA中，设置CW窗长为最小值，或者以预定倍数减小CWS窗长；
当在一段预定时长内没有数据传输时，所述时长超过预定时长门限时，在接下来的一次或多次CCA中，设置CW窗长为满足最小值与最大值限制的一个随机值。
具体地，考虑到可能通过门限定义不能处理所有异常情况，因此这里再增加一种机制：
当站点或终端有数据要传输，并且等待时延超过某个门限，则认为该站点或终端长期无法占用信道，则在接下来的一次或若干次CCA中，设置CW窗长为最小值，或者以某个可用倍数减小CW窗长，从而增大该站点抢占信道概率。
当站点或终端在一段较长时间内没有数据传输，该时间段超过某个门限，则在接下来的一次或若干次CCA中，设置CW窗长为满足最小值与最大值限制的一个随机值。
本发明实施例中，当具有多种方式确定本次LBT过程的CW窗长时，按照配置方式确定本次LBT过程的CW窗长；所述方法还包括：
通过高层RRC信令接收基站发送的配置方式；
通过高层RRC信令接收基站发送的通知消息，以通知终端从一种CW 窗长确定方式切换到另一种CW窗长确定方式；其中，切换是非周期配置或周期配置，或者根据业务传输簇burst配置。
具体地，两种CW窗长确定方式的融合。当多种方式都可以用于确定CW窗长时，例如基于终端反馈方式与站点感知方式都可用，那么需要解决如何配置以及如何通知的问题：
网络侧静态或半静态配置CW窗长确定方式，可以通过操作维护管理(OAM，Operation Administration and Maintenance)的方式配置，通过高层RRC信令来通知终端具体配置方式。多种CW窗长确定方式之间，可以实现半静态或动态切换，可以通过高层RRC信令来通知终端从一种CW窗长确定方式切换到另一种CW窗长确定方式。切换可以是非周期配置或周期配置，或者可以根据业务传输簇burst来配置，例如在完成一个或多个burst传输后，从一种CW窗长确定方式切换到另一种CW窗长确定方式，此时可以通过高层RRC信令或动态DCI信令来通知终端。
本发明实施例中，所述方法还包括：
在使用多个非授权频段时，在各个非授权频段进行LBT测量时，使用相同的CW窗长确定方式，或者使用不同的CW窗长确定方式；
当在多个非授权频段上使用相同的CW窗长确定方式时，多个非授权载波的所述CW窗长判决门限相同，或者不同。
具体地，站点或终端可以使用一个或多个非授权频段进行传输，在使用多个非授权频段时，在各个非授权频段进行LBT测量时，可以使用相同的CW窗长调整方法，也可以使用不同的CW窗调整方法，具体各非授权频段上使用哪种CW窗调整方法，可以由高层RRC信令半静态配置。
如果在多个非授权频段上使用相同的CW窗调整方法，对于门限阈值的配置，多个非授权载波可以相同，也可以不同，由高层RRC信令半静 态配置，或者由下行控制信息(DCI，Downlink Control Information)信令动态配置。
再者，站点之间的交互可以通过X2接口交互彼此的CW调整信息，CW调整信息包括：CW窗调整方法、门限阈值、当前或历史CWS值中的一种或多种信息。
对于非授权频段，当站点因下行LBT失败而无法发送信道测量导频时，通知终端对应本次CSI反馈的上行时、频资源不可用。
具体地，对于非授权频段，当站点因为下行LBT失败而无法发送信道测量导频，则需要通知终端对应本次CSI反馈的上行时、频资源不可用，具体可以有以下通知方法：1)基站在授权载波上用动态控制信令通知，具体可以承载在PDCCH的DL format中；2)基站在非授权载波上用动态控制信令通知。
所述反馈CSI的上行时、频资源，可以是授权频段上的资源，也可以是非授权频段上的资源。
通知以上信息的作用在于：终端可能因为盲检错误而误测到CSI信息，并在基站认为终端不可用的上行时、频资源上反馈错误CSI。
在LBT过程中，将CCA分为初始CCA阶段和扩展CCA阶段；在初始CCA阶段，侦听窗长包括一个随机窗长，或者包括一个固定窗长加随机窗长。
具体地，在LBT流程中，如果把CCA分为初始CCA阶段和扩展CCA阶段，那么在初始CCA阶段，也需要对侦听窗长引入随机性，初始CCA阶段的侦听窗长可以只包括一个随机窗长，或者包括一个固定窗长+随机窗长，具体随机窗长可以是n×unit，根据不同的应用场景，n可以有不同的范围，unit为单位长度，在不同应用场景下可以有不同的取值，或所有 应用场景下取固定值。
下面结合具体实施例对本发明实施例的竞争窗调整方法中的各个步骤做进一步详细描述。
实施例一
在本实施例中，CW窗长判决门限是一个静态或半静态配置好的常量，而具体Metric计算，存在以下几种方法：
方法1：Metric＝D，其中D是本次LBT之前一次或若干次LBT过程中进入Defer period的次数之和。
方法2：Metric＝D/N，其中D是本次LBT之前一次或若干次LBT过程中进入Defer period的次数之和，N是LBT之前一次或若干次LBT过程中，所经历的eCCA过程对应的slot总数目。
方法3：Metric＝T/Y，其中T是本次LBT之前一次或若干次LBT过程中所经历的eCCA过程信道为忙的时间长度，单位可以是微秒或毫秒，Y是本次LBT之前一次或若干次LBT过程中所经历的eCCA过程经历的时间长度，单位可以是微秒或毫秒。
网络侧通过高层RRC信令，通知终端具体Metric计算方法，以及具体的判决门限常量。
实施例二
在本实施例中，CW窗长判决门限是和若干因素相关的动态或半静态阈值。该阈值的确定，可以有以下几种方法：
方法1：阈值Threshold＝Function(QoS级别)，这里，阈值Threshold表示阈值Threshold，Function()表示括号内为自变量的函数。其中，QoS级别指示本次LBT想要发送的数据优先级，设QoS级别从1到16依次表 示优先级从高到低，那么具体Function可以是一个加法等式，其中QoS级别是输入加数之一；具体Function也可以是一个乘法等式或指数等式，其中QoS级别是输入乘数或输入指数幂之一。
方法2：阈值Threshold＝Function(负载情况)，其中负载情况指进行本次LBT的节点在当前或者近期一段时间内的业务负载级别，具体可以是低负载、中负载或高负载，具体的Function可以是类抛物线函数，从而使负载大小与Threshold呈非线性关系，例如，在低负载和高负载下，Threshold较低，而在中负载下，Threshold较高。
方法3：阈值Threshold＝Function(最大CWS持续时间)，其中最大CWS持续时间指在之前的LBT过程中，每次LBT都会确定一个CW值，如果在多次连续LBT中的CW值都是其可选范围内最大值，那么这多次LBT所持续的时间长度，以微秒或毫秒为单位。具体Function可以是一个乘法等式或指数等式，其中最大CWS持续时间是输入乘数或输入指数幂之一。
方法4：阈值Threshold＝Function(待传输数据等待发送时长)，其中待传输数据等待发送时长，表示某个站点或终端在t1时刻有业务到达介质访问控制(MAC，Media Access Control)层，但因为调度原因或者LBT竞争信道原因，该业务并没有立即传输，在t2时刻该业务才被传输完，那么时间段t2-t1即为待传输数据等待发送时长。具体Function可以是一个加法等式或乘法等式，其中待传输数据等待发送时长是输入加数或乘数之一。
方法5：阈值Threshold＝Function(系统目标复用因子)，其中系统目标复用因子为系统内小区或扇区对非授权频段复用情况的量化，具体Function可能不限定为一个等式，当系统目标复用因子较大时，Function 的结果是取得一个较高阈值Threshold；当系统目标复用因子较小时，Function的结果是取得一个较低阈值Threshold。
方法6：阈值Threshold＝Function(传输类型)，其中传输类型指待传输数据是首传数据还是重传数据，具体Function可能不限定为一个等式，当传输类型是首传数据时，Function的结果是取得一个较低阈值Threshold；当传输类型是重传数据时，Function的结果是取得一个较高阈值Threshold。
方法7：阈值Threshold＝Function(本次传输能力与累积传输吞吐量之比)，其中本次传输能力与累积传输吞吐量之比，本次传输能力，具体指跟据本次预调度，站点或终端利用进行LBT的非授权频段可以达到的吞吐量或者频谱效率。具体Function可以是加法等式或乘法等式或指数幂等式，其中本次传输能力与累积传输吞吐量之比，可以作为加数或乘数或幂指数之一。
方法8：阈值Threshold＝观测窗内终端反馈NACK的比例，例如1％或5％或10％。观测窗可以是在本次LBT之前一个或多个bust中调度终端的第一个子帧或者最后一个子帧，或者奇数子帧或者偶数子帧。
对于具体阈值Threshold的计算，可以是以上方法中任意一种，或者多种方法的组合。
实施例三
在基于实施例1或实施例2中的方法，确定了阈值Threshold并且计算出Metric后，把Metric值与阈值Threshold进行比较，如果Metric值大于阈值Threshold，站点可以按照以下两种方式来调整本次LBT的CW值：
方法1：按照固定倍数来增大本次LBT的CW值，例如本次LBT的CW值可以是之前一次LBT CW值的1.5倍、2倍、2.5倍、3倍等等固定 倍数关系。
方法2：根据Metric值大于阈值Threshold的程度，动态决定本次LBT的CW值增大多少倍，例如把Metric-Threshold或Metric/Threshold的值与区间[a1,a2]，[a2,a3]，[a3,a4]，…比较，当值落在某个区间时，本次LBT的CW值就增大该区间对应的倍数，每个区间对应的增大倍数不同。
如果Metric值不大于阈值Threshold，站点可以按照上面的方法1、方法2来减小本次LBT的CW值，只是相应的把方法1、方法2中的增大改为减小。
实施例四
站点想要使用多个非授权载波，因此需要在多个非授权载波上做LBT，网络侧通过RRC信令为每个载波独立配置CW窗长调整方法以及相应的门限阈值确定方法。每个载波上的配置均为半静态配置，在重新配置后，网络侧通过RRC信令通知新的配置。如果各个载波上的配置相同，那么RRC信令只通知一种配置方法。
实施例五
在目标非授权载波上，某个站点对应下行子帧k的下行LBT失败，原本站点要在子帧k上发送信道测量导频，但因为下行LBT失败，因此站点无法发送导频，从而终端也无法进行本次信道估计。终端在子帧m上已经收到了对应子帧k中信道估计的非周期CSI反馈请求，按照该请求，终端将按照请求中指示的时、频资源上进行非周期CSI反馈，但因为子帧k的信道测量导频不能如期发送，因此基站要通知终端，子帧m指示的CSI反馈不再进行，基站可以在授权载波或者非授权载波上通过PDCCH 中的DL format中增加1或大于1比特，来指示终端对应的非周期反馈时频资源被释放，无需反馈。
实施例六
在cat4的CCA流程中，对于初始CCA阶段，因为没有随机回退窗，因此无法引入竞争站点之前的随机性，容易产生碰撞，因此在利用cat4LBT进行信道侦听时，初始CCA阶段包括一个固定窗长+随机窗长，具体随机窗长为n*slot，n为小于等于7的随机整数。
图2为本发明实施例的竞争窗调整装置的结构组成示意图，如图2所示，所述装置包括：
确定单元21，设置为在执行LBT过程时，确定本次LBT过程的CW窗长判决门限；
计算单元22，设置为根据第一信息，按照配置的方式计算Metric；
比较单元23，设置为将所述Metric与所述CW窗长判决门限进行比较；
调整单元24，设置为当所述Metric大于所述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当所述Metric小于或等于所述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。
本发明实施例中，所述确定单元21，还设置为按照如下方式确定所述CW窗长判决门限：所述CW窗长判决门限为预定义的常量；或者，所述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值：QoS等级、业务负载情况、连续最大CWS持续时间、待传输数据等待发送时长、系统目标复用因子、传输类型是首传还是重传、本次传 输能力与累积传输吞吐量之比。
本发明实施例中，所述确定单元21，还设置为按照如下方式确定所述CW窗长判决门限：所述CW窗长判决门限与所述QoS级别呈正比例关系或幂指数关系；所述CW窗长判决门限与所述业务负载情况呈抛物线关系；所述CW窗长判决门限与所述连续最大CWS持续时间呈幂指数关系或正比例关系；所述CW窗长判决门限与所述待传输数据等待发送时长呈正比例关系；所述CW窗长判决门限根据所述系统目标复用因子动态调整；所述CW窗长判决门限根据所述传输类型是首传还是重传动态调整；所述CW窗长判决门限与所述本次传输能力与累积传输吞吐量之比呈幂指数关系或正比例关系。
本发明实施例中，所述确定单元21，还设置为根据所述参数的取值范围，选择相应的参数确定本次LBT过程的CW窗长判决门限。
本发明实施例中，所述设定规则，为：
当所述Metric大于所述CW窗长判决门限时，按照固定的倍数增大所述CW窗长；或者，按照非固定的倍数增大所述CW窗长；其中，增大的倍数由站点根据Metric大于所述CW窗长判决门限的程度进行确定；
当所述Metric小于或等于所述CW窗长判决门限时，按照固定的倍数减小所述CW窗长；或者，按照非固定的倍数减小所述CW窗长；其中，减小的倍数由站点根据Metric小于所述CW窗长判决门限的程度进行确定。
本发明实施例中，所述调整单元24，还设置为当有数据要传输时，并且等待时延超过预定门限时，在接下来的一次或多次CCA中，设置CW窗长为最小值，或者以预定倍数减小CWS窗长；
当在一段预定时长内没有数据传输时，所述时长超过预定时长门限时，在接下来的一次或多次CCA中，设置CW窗长为满足最小值与最大值限 制的一个随机值。
本发明实施例中，所述确定单元21，还设置为当具有多种方式确定本次LBT过程的CW窗长时，按照配置方式确定本次LBT过程的CW窗长；
所述装置还包括：
接收单元，设置为通过高层RRC信令接收基站发送的配置方式；通过高层RRC信令接收基站发送的通知消息，以通知终端从一种CW窗长确定方式切换到另一种CW窗长确定方式；其中，切换是非周期配置或周期配置，或者根据业务传输簇burst配置。
本发明实施例中，所述计算单元22，还设置为按照如下方式计算Metric：Metric为D，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和；或者，Metric为D除以N，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和，N是LBT之前一次或多次LBT过程中所经历的eCCA过程对应的slot总数目；或者，Metric为T除以Y，其中T是本次LBT之前一次或多次LBT过程中所经历的eCCA过程信道为忙的时间长度，Y是本次LBT之前一次或多次LBT过程中所经历的eCCA过程经历的时间长度。
本发明实施例中，所述确定单元21，还设置为在使用多个非授权频段时，在各个非授权频段进行LBT测量时，使用相同的CW窗长确定方式，或者使用不同的CW窗长确定方式；当在多个非授权频段上使用相同的CW窗长确定方式时，多个非授权载波的所述CW窗长判决门限相同，或者不同。
本发明实施例中，多个站点之间通过X2接口交互彼此的CW调整信息，所述CW调整信息包括：CW窗调整方法、门限阈值、当前或历史CWS值中的一种或多种信息。
所述装置还包括：通知单元25，设置为对于非授权频段，当站点因下行LBT失败而无法发送信道测量导频时，通知终端对应本次CSI反馈的上行时、频资源不可用。
在LBT过程中，将CCA分为初始CCA阶段和扩展CCA阶段；在初始CCA阶段，侦听窗长包括一个随机窗长，或者包括一个固定窗长加随机窗长。
本领域技术人员应当理解，图2所示的竞争窗调整装置中的各单元的实现功能可参照前述竞争窗调整方法的相关描述而理解。
本发明实施例所记载的技术方案之间，在不冲突的情况下，可以任意组合。
本发明的实施例还提供了一种存储介质。可选地，在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，在执行先听后说LBT过程时，确定本次LBT过程的竞争窗CW窗长判决门限；
S2，根据第一信息，按照配置的方式计算值Metric；
S3，将Metric与CW窗长判决门限进行比较；
S4，当Metric大于CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当Metric小于或等于CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
本发明实施例的技术方案中，在执行LBT过程时，确定本次LBT过程的CW窗长判决门限；根据第一信息，按照配置的方式计算Metric；将上述Metric与上述CW窗长判决门限进行比较；当上述Metric大于上述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当上述Metric小于或等于上述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。在非授权频谱各种各样的无线系统中，动态调整了CW窗长，降低了各个系统之间的干扰。

Claims (24)

  1. 一种竞争窗调整方法，所述方法包括：
    在执行先听后说LBT过程时，确定本次LBT过程的竞争窗CW窗长判决门限；
    根据第一信息，按照配置的方式计算值Metric；
    将所述Metric与所述CW窗长判决门限进行比较；
    当所述Metric大于所述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当所述Metric小于或等于所述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。
  2. 根据权利要求1所述的竞争窗调整方法，其中，所述确定本次LBT过程的CW窗长判决门限，包括：
    所述CW窗长判决门限为预定义的常量；或者，
    所述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值：服务质量QoS等级、业务负载情况、连续最大CWS持续时间、待传输数据等待发送时长、系统目标复用因子、传输类型是首传还是重传、本次传输能力与累积传输吞吐量之比；或者，
    所述CW窗长判决门限根据终端反馈的确认/非确认ACK/NACK消息确定。
  3. 根据权利要求2所述的竞争窗调整方法，其中，所述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值，包括：
    所述CW窗长判决门限与所述QoS级别呈正比例关系或幂指数关系；
    所述CW窗长判决门限与所述业务负载情况呈抛物线关系；
    所述CW窗长判决门限与所述连续最大CWS持续时间呈幂指数关系或正比例关系；
    所述CW窗长判决门限与所述待传输数据等待发送时长呈正比例关系；
    所述CW窗长判决门限根据所述系统目标复用因子动态调整；
    所述CW窗长判决门限根据所述传输类型是首传还是重传动态调整；
    所述CW窗长判决门限与所述本次传输能力与累积传输吞吐量之比呈幂指数关系或正比例关系。
  4. 根据权利要求2所述的竞争窗调整方法，其中，所述确定本次LBT过程的CW窗长判决门限，包括：
    根据所述参数的取值范围，选择相应的参数确定本次LBT过程的CW窗长判决门限。
  5. 根据权利要求1所述的竞争窗调整方法，其中，所述设定规则，为：
    当所述Metric大于所述CW窗长判决门限时，按照固定的倍数增大所述CW窗长；或者，按照非固定的倍数增大所述CW窗长；其中，增大的倍数由站点根据Metric大于所述CW窗长判决门限的程度进行确定；
    当所述Metric小于或等于所述CW窗长判决门限时，按照固定的倍数减小所述CW窗长；或者，按照非固定的倍数减小所述CW窗长；其中，减小的倍数由站点根据Metric小于所述CW窗长判决门限的程度进行确定。
  6. 根据权利要求1所述的竞争窗调整方法，其中，所述方法还包括：
    当有数据要传输时，并且等待时延超过预定门限时，在接下来的一次或多次空闲信道评估CCA中，设置CW窗长为最小值，或者以预定倍数减小CWS窗长；
    当在一段预定时长内没有数据传输时，所述时长超过预定时长门限时，在接下来的一次或多次CCA中，设置CW窗长为满足最小值与最大值限 制的一个随机值。
  7. 根据权利要求1所述的竞争窗调整方法，其中，当具有多种方式确定本次LBT过程的CW窗长时，按照配置方式确定本次LBT过程的CW窗长；所述方法还包括：
    通过高层无线资源控制RRC信令接收基站发送的配置方式；
    通过高层RRC信令接收基站发送的通知消息，以通知终端从一种CW窗长确定方式切换到另一种CW窗长确定方式；其中，切换是非周期配置或周期配置，或者根据业务传输簇burst配置。
  8. 根据权利要求7所述的竞争窗调整方法，其中，所述根据第一信息，按照配置的方式计算Metric，包括：
    Metric为D，其中D是本次LBT之前一次或多次LBT过程中进入延迟期Defer period的次数之和；或者，
    Metric为D除以N，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和，N是LBT之前一次或多次LBT过程中所经历的扩展空闲信道评估eCCA过程对应的时隙slot总数目；或者，
    Metric为T除以Y，其中T是本次LBT之前一次或多次LBT过程中所经历的eCCA过程信道为忙的时间长度，Y是本次LBT之前一次或多次LBT过程中所经历的eCCA过程经历的时间长度。
  9. 根据权利要求7所述的竞争窗调整方法，其中，所述方法还包括：
    在使用多个非授权频段时，在各个非授权频段进行LBT测量时，使用相同的CW窗长确定方式，或者使用不同的CW窗长确定方式；
    当在多个非授权频段上使用相同的CW窗长确定方式时，多个非授权载波的所述CW窗长判决门限相同，或者不同。
  10. 根据权利要求5所述的竞争窗调整方法，其中，多个站点之间通 过X2接口交互彼此的CW调整信息，所述CW调整信息包括：CW窗调整方法、门限阈值、当前或历史CWS值中的一种或多种信息。
  11. 根据权利要求1所述的竞争窗调整方法，其中，所述方法还包括：
    对于非授权频段，当站点因下行LBT失败而无法发送信道测量导频时，通知终端对应本次CSI反馈的上行时、频资源不可用。
  12. 根据权利要求1所述的竞争窗调整方法，其中，在LBT过程中，将CCA分为初始CCA阶段和扩展CCA阶段；在初始CCA阶段，侦听窗长包括一个随机窗长，或者包括一个固定窗长加随机窗长。
  13. 一种竞争窗调整装置，所述装置包括：
    确定单元，设置为在执行LBT过程时，确定本次LBT过程的CW窗长判决门限；
    计算单元，设置为根据第一信息，按照配置的方式计算Metric；
    比较单元，设置为将所述Metric与所述CW窗长判决门限进行比较；
    调整单元，设置为当所述Metric大于所述CW窗长判决门限时，按照设定规则增大本次LBT过程的CW窗长；当所述Metric小于或等于所述CW窗长判决门限时，按照预定规则减小本次LBT过程的CW窗长。
  14. 根据权利要求13所述的竞争窗调整装置，其中，所述确定单元，还设置为按照如下方式确定所述CW窗长判决门限：所述CW窗长判决门限为预定义的常量；或者，所述CW窗长判决门限为与以下一个或多个参数相关的静态、或半静态、或动态阈值：QoS等级、业务负载情况、连续最大CWS持续时间、待传输数据等待发送时长、系统目标复用因子、传输类型是首传还是重传、本次传输能力与累积传输吞吐量之比；或者，所述CW窗长判决门限根据终端反馈的确认/非确认ACK/NACK消息确定。
  15. 根据权利要求14所述的竞争窗调整装置，其中，所述确定单元， 还设置为按照如下方式确定所述CW窗长判决门限：所述CW窗长判决门限与所述QoS级别呈正比例关系或幂指数关系；所述CW窗长判决门限与所述业务负载情况呈抛物线关系；所述CW窗长判决门限与所述连续最大CWS持续时间呈幂指数关系或正比例关系；所述CW窗长判决门限与所述待传输数据等待发送时长呈正比例关系；所述CW窗长判决门限根据所述系统目标复用因子动态调整；所述CW窗长判决门限根据所述传输类型是首传还是重传动态调整；所述CW窗长判决门限与所述本次传输能力与累积传输吞吐量之比呈幂指数关系或正比例关系。
  16. 根据权利要求14所述的竞争窗调整装置，其中，所述确定单元，还设置为根据所述参数的取值范围，选择相应的参数确定本次LBT过程的CW窗长判决门限。
  17. 根据权利要求13所述的竞争窗调整装置，其中，所述设定规则，为：
    当所述Metric大于所述CW窗长判决门限时，按照固定的倍数增大所述CW窗长；或者，按照非固定的倍数增大所述CW窗长；其中，增大的倍数由站点根据Metric大于所述CW窗长判决门限的程度进行确定；
    当所述Metric小于或等于所述CW窗长判决门限时，按照固定的倍数减小所述CW窗长；或者，按照非固定的倍数减小所述CW窗长；其中，减小的倍数由站点根据Metric小于所述CW窗长判决门限的程度进行确定。
  18. 根据权利要求13所述的竞争窗调整装置，其中，所述调整单元，还设置为当有数据要传输时，并且等待时延超过预定门限时，在接下来的一次或多次CCA中，设置CW窗长为最小值，或者以预定倍数减小CWS窗长；
    当在一段预定时长内没有数据传输时，所述时长超过预定时长门限时， 在接下来的一次或多次CCA中，设置CW窗长为满足最小值与最大值限制的一个随机值。
  19. 根据权利要求13所述的竞争窗调整装置，其中，所述确定单元，还设置为当具有多种方式确定本次LBT过程的CW窗长时，按照配置方式确定本次LBT过程的CW窗长；
    所述装置还包括：
    接收单元，设置为通过高层RRC信令接收基站发送的配置方式；通过高层RRC信令接收基站发送的通知消息，以通知终端从一种CW窗长确定方式切换到另一种CW窗长确定方式；其中，切换是非周期配置或周期配置，或者根据业务传输簇burst配置。
  20. 根据权利要求19所述的竞争窗调整装置，其中，所述计算单元，还设置为按照如下方式计算Metric：Metric为D，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和；或者，Metric为D除以N，其中D是本次LBT之前一次或多次LBT过程中进入Defer period的次数之和，N是LBT之前一次或多次LBT过程中所经历的eCCA过程对应的slot总数目；或者，Metric为T除以Y，其中T是本次LBT之前一次或多次LBT过程中所经历的eCCA过程信道为忙的时间长度，Y是本次LBT之前一次或多次LBT过程中所经历的eCCA过程经历的时间长度。
  21. 根据权利要求19所述的竞争窗调整装置，其中，所述确定单元，还设置为在使用多个非授权频段时，在各个非授权频段进行LBT测量时，使用相同的CW窗长确定方式，或者使用不同的CW窗长确定方式；当在多个非授权频段上使用相同的CW窗长确定方式时，多个非授权载波的所述CW窗长判决门限相同，或者不同。
  22. 根据权利要求17所述的竞争窗调整装置，其中，多个站点之间通过X2接口交互彼此的CW调整信息，所述CW调整信息包括：CW窗调整方法、门限阈值、当前或历史CWS值中的一种或多种信息。
  23. 根据权利要求13所述的竞争窗调整装置，其中，所述装置还包括：
    通知单元，设置为对于非授权频段，当站点因下行LBT失败而无法发送信道测量导频时，通知终端对应本次CSI反馈的上行时、频资源不可用。
  24. 根据权利要求13所述的竞争窗调整装置，其中，在LBT过程中，将CCA分为初始CCA阶段和扩展CCA阶段；在初始CCA阶段，侦听窗长包括一个随机窗长，或者包括一个固定窗长加随机窗长。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2747845C1 (ru) * 2017-09-25 2021-05-17 Хуавей Текнолоджиз Ко., Лтд. Устройство и способ для прослушивания канала восходящей линии связи
US11405980B2 (en) 2018-09-28 2022-08-02 Apple Inc. Listen again after talk for broadcast/multi-cast communications
US20240188126A1 (en) * 2018-08-09 2024-06-06 Ofinno, Llc Bandwidth part switching and determination of a contention window

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109495923B (zh) * 2017-09-11 2021-09-07 中兴通讯股份有限公司 一种cca检测方法、装置、存储介质和终端
CN110166182B (zh) * 2018-02-14 2022-07-19 华为技术有限公司 一种竞争窗管理的方法及发送设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102781108A (zh) * 2011-05-10 2012-11-14 上海无线通信研究中心 一种时延可控的联合无线资源调度方法
WO2012160510A1 (en) * 2011-05-24 2012-11-29 Renesas Mobile Corporation Channel access control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102781108A (zh) * 2011-05-10 2012-11-14 上海无线通信研究中心 一种时延可控的联合无线资源调度方法
WO2012160510A1 (en) * 2011-05-24 2012-11-29 Renesas Mobile Corporation Channel access control

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
QUALCOMM ET AL.: "Rl-154975: WF on CW Adjustment Based on eNB Sensing", 3GPP TSG RAN WG1 #82, 30 August 2015 (2015-08-30), XP051045068 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2747845C1 (ru) * 2017-09-25 2021-05-17 Хуавей Текнолоджиз Ко., Лтд. Устройство и способ для прослушивания канала восходящей линии связи
US11357043B2 (en) 2017-09-25 2022-06-07 Huawei Technologies Co., Ltd. Method for listening on uplink channel and apparatus
US11792847B2 (en) 2017-09-25 2023-10-17 Huawei Technologies Co., Ltd. Method for listening on uplink channel and apparatus
US20240188126A1 (en) * 2018-08-09 2024-06-06 Ofinno, Llc Bandwidth part switching and determination of a contention window
US11405980B2 (en) 2018-09-28 2022-08-02 Apple Inc. Listen again after talk for broadcast/multi-cast communications
US11818803B2 (en) 2018-09-28 2023-11-14 Apple Inc. Listen again after talk for broadcast/multi-cast communications

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