CN107113865A - Based on the channel evaluating method and sending node for exempting from licensed spectrum - Google Patents
Based on the channel evaluating method and sending node for exempting from licensed spectrum Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of based on the channel evaluating method and sending node of exempting from licensed spectrum, and this method includes：The channel detection result of the sending node in sending node statistics preset time period, determines that contention window is long according to channel detection result, long further according to the contention window, and idle channel evaluation and test at least one times is carried out to exempting from licensed spectrum.In the present invention, contention window length is determined according to the channel detection result in preset time period, determined according to the service condition of channel, thus determine that contention window length can intuitively react the load of current network, so as to ensure that the contention window length determined is optimal, and then idle channel evaluation and test and data transmission are carried out using the contention window length, so as to ensure that the fairness of channel occupancy.
Description
The present invention relates to wireless communication techniques more particularly to a kind of based on the channel evaluating method and sending node of exempting from licensed spectrum.
With long term evolution (Long Term Evolution, abbreviation LTE) and long-term evolution upgrading (Long Term Evolution-Advanced, abbreviation LTE-A) be that the forth generation cell mobile communication systems of representative have the advantages such as high speed data transfers and seamless coverage.But as user constantly promotes wireless data transmission demand, current cellular networks, which still suffer from, further increases the various problems such as wireless cellular network capacity and marginal user performance.Spread bandwidth has become a hot topic of research as the most direct effective method of capacity of cellular networks is promoted.In the method for spread bandwidth, exempt from licensed spectrum carry out data transmission this method it is low in cost and have usable bandwidth abundant, thus tool have great advantage.But use is when exempting from licensed spectrum and carrying out data transmission, there may be the base station of multiple operators (Evolved NodeB, abbreviation eNB) it occupies same exempt from licensed band simultaneously, or exempt to permit to work at the same time radar on carrier wave and with Wireless Fidelity (Wireless Fidelity, abbreviation Wi-Fi) for other wireless communication systems such as 802.11 of representative same.When this occurs, it will lead to the problem of and node coexists exempt from mutually to generate severe jamming in licensed spectrum same.
Interference is generated in order to solve the problems, such as to coexist node on exempting from licensed spectrum, Channel Detection can be carried out on exempting from licensed spectrum using the method for listening to rollback, i.e. idle channel evaluates and tests (Clear Channel Assessment, abbreviation CCA), data transmission is carried out after idle channel is evaluated and tested successfully.Wherein, idle channel evaluation and test is on the basis of contention window length, preset random number is generated in the long corresponding range of contention window, if the number for listening to free timeslot meets preset random number, then start to send data, otherwise continue channel sense in next time slot, exempt from fair between licensed spectrum Zhong Ge operator and system node coexist to realize.
In the prior art, Wi-Fi system is using a kind of based on confirmation (Acknowledge, abbreviation ACK) feedback the long method of adjustment of dynamic competition window, specifically, the contention window length of sending node is initialized as p (such as p=15), and sending node detects receiving node feedback in a time window after being sent completely every time
ACK information keeps p constant if receiving ACK；If not receiving ACK, reception failure is judged, sending node doubles contention window length before next time sends, that is, is set as p=2*p+1 (p=31)；Continue to double contention window length if continuing not receive ACK, reaches maximum value 1023 until contention window is long, otherwise contention window length is reset to initial value (p=15) if receiving ACK.
But, using in the method for determining contention window length in the prior art, it is according to whether receiving ACK message judges network load, but since the tolerance of not homologous ray for network interferences is different, such as LTE system is different from tolerance of the Wi-Fi system for network interferences, under identical network load, the receiving node of LTE can successfully detect useful signal and feeding back ACK message, and Wi-Fi system receiving node can not successfully detect useful signal without feeding back ACK message, so that LTE system and Wi-Fi system are just different to the judging result of network load.Therefore, the load of current network can not be intuitively reacted using the prior art, to can not determine that optimal contention window is long, lead to not the fairness for guaranteeing channel occupancy.
Summary of the invention
The present invention provide it is a kind of be capable of determining that more preferably contention window is long based on the channel evaluating method and sending node of exempting from licensed spectrum, thus preferably guarantee channel occupancy fairness.
First aspect of the embodiment of the present invention provides a kind of based on the channel evaluating method for exempting from licensed spectrum, comprising:
Sending node counts the channel detection result of the sending node in preset time period, determines that contention window is long according to the channel detection result；
It is long according to the contention window, idle channel evaluation and test at least once is carried out to licensed spectrum is exempted from.
With reference to first aspect, in the first possible embodiment of first aspect, the channel detection result of the sending node in the sending node statistics preset time period determines that contention window is long according to the channel detection result, comprising:
Sending node to before exempting from the licensed spectrum progress idle channel evaluation and test, counts the channel detection result of the sending node in preset time period, determines that contention window is long according to the channel detection result every time；
At the beginning of the finish time of the preset time period is idle channel evaluation and test.
With reference to first aspect, in second of possible embodiment of first aspect, the channel detection result of the sending node in the sending node statistics preset time period determines that contention window is long according to the channel detection result, comprising:
Sending node counts the Channel Detection knot of the sending node in preset time period according to predetermined period
Fruit determines that contention window is long according to the channel detection result；
The finish time of the preset time period is the finish time of the predetermined period.
With reference to first aspect, in the third possible embodiment of first aspect, the channel detection result of the sending node in the sending node statistics preset time period, comprising:
The channel signal energy that the sending node in sending node statistics preset time period detects, determines channel detection result according to the channel signal energy；
Wherein, the preset time period includes at least one unit time.
The third possible embodiment with reference to first aspect, in the 4th kind of possible embodiment of first aspect, the channel signal energy that the sending node in the sending node statistics preset time period detects, determines channel detection result according to the channel signal energy, comprising:
Sending node counts the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, channel signal energy as the busy unit time, is less than or equal to the unit time of preset threshold as the idle unit time by the unit time that channel signal energy is greater than preset threshold；
Using the ratio of total unit time number of carry out Channel Detection included by the number of the busy unit time and the preset time period as the channel detection result.
The third possible embodiment with reference to first aspect, in the 5th kind of possible embodiment of first aspect, the channel signal energy that the sending node in the sending node statistics preset time period detects, determines channel detection result according to the channel signal energy, comprising:
Sending node counts the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, using the summation of the channel signal energy detected in each unit time for carrying out Channel Detection as the channel detection result.
First with reference to first aspect is described to determine that contention window is long according to the channel detection result in the 6th kind of possible embodiment of first aspect any one of to the 5th kind of possible embodiment, comprising:
According to the long mapping relations of the channel detection result and contention window, determine that contention window is long.
First with reference to first aspect is any one of to the 6th kind of possible embodiment, in the 7th kind of possible embodiment of first aspect, the first channel detection result of the sending node at least one first preset time period before counting the preset time period the method also includes: the sending node；
Correspondingly,
It is described to determine that contention window is long according to the channel detection result, comprising:
According to the corresponding first channel detection result of at least one first preset time period before the corresponding channel detection result of the preset time period and the preset time period, determine that the contention window is long.
First with reference to first aspect is any one of to the 7th kind of possible embodiment, in the 8th kind of possible embodiment of first aspect, the channel detection result of the sending node in sending node statistics preset time period, before determining that contention window is long according to the channel detection result, further includes:
Institute having time of the sending node in the preset time period carries out Channel Detection.
First with reference to first aspect is any one of to the 7th kind of possible embodiment, in the 9th kind of possible embodiment of first aspect, the channel detection result of the sending node in sending node statistics preset time period, before determining that contention window is long according to the channel detection result, further includes:
The sending node carries out Channel Detection within the idle channel evaluation and test time in the preset time period.
First with reference to first aspect is any one of to the 7th kind of possible embodiment, in the tenth kind of possible embodiment of first aspect, the channel detection result of the sending node in sending node statistics preset time period, before determining that contention window is long according to the channel detection result, further includes:
The sending node carries out Channel Detection within the time for not sending data in the preset time period.
Second aspect of the embodiment of the present invention provides a kind of sending node, comprising: determining module determines that contention window is long according to the channel detection result for counting the channel detection result of the sending node in preset time period；
Evaluation and test module carries out idle channel evaluation and test at least once to licensed spectrum is exempted from for long according to the contention window.
In conjunction with second aspect, in the first possible implementation of the second aspect, the determining module, it is specifically used for, every time to exempting from before licensed spectrum carries out the idle channel evaluation and test, the channel detection result for counting the sending node in preset time period, determines that contention window is long according to the channel detection result；
Wherein, the finish time of the preset time period is at the beginning of idle channel is evaluated and tested.
In conjunction with second aspect, in a second possible implementation of the second aspect, the determining module is specifically used for, and according to the channel detection result of the sending node in predetermined period statistics preset time period, determines that contention window is long according to the channel detection result；
Wherein, the finish time of the preset time period is the finish time of the predetermined period.
In conjunction with second aspect, in the third possible implementation of the second aspect, the determining module
For counting the channel detection result of the sending node in preset time period, specifically: the channel signal energy that the sending node in statistics preset time period detects determines channel detection result according to the channel signal energy；
Wherein, the preset time period includes at least one unit time.
In conjunction with the third possible implementation of second aspect, in the fourth possible implementation of the second aspect, the determining module is specifically used for the channel signal energy that the sending node in statistics preset time period detects, channel detection result is determined according to the channel signal energy, specifically: count the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, channel signal energy is greater than the unit time of preset threshold as the busy unit time, channel signal energy is less than or equal to the unit time of preset threshold as the idle unit time；Using the ratio of total unit time number of carry out Channel Detection included by the number of the busy unit time and the preset time period as the channel detection result.
In conjunction with the third possible implementation of second aspect, in a fifth possible implementation of the second aspect, the determining module is specifically used for the channel signal energy that the sending node in statistics preset time period detects, channel detection result is determined according to the channel signal energy, specifically: the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection is counted, using the summation of the channel signal energy detected in each unit time for carrying out Channel Detection as the channel detection result.
In conjunction with any one of first to the 5th kind of possible embodiment of second aspect, in the sixth possible implementation of the second aspect, the determining module, for determining that contention window is long according to the channel detection result, specifically: according to the long mapping relations of the channel detection result and contention window, determine that contention window is long.
In conjunction with any one of first to the 6th kind of possible embodiment of second aspect, in the 7th kind of possible implementation of second aspect, the determining module, the first channel detection result of the sending node at least one first preset time period before being also used to count the preset time period；
Correspondingly,
The determining module, for determining that contention window is long according to the channel detection result, specifically: according to the corresponding first channel detection result of at least one first preset time period before the corresponding channel detection result of the preset time period and the preset time period, determine that the contention window is long.
In conjunction with any one of first to the 7th kind of possible embodiment of second aspect, in second aspect
In 8th kind of possible implementation, the sending node further include: first detection module；
The first detection module carries out Channel Detection for institute's having time in the preset time period.
In conjunction with any one of first to the 7th kind of possible embodiment of second aspect, in the 9th kind of possible implementation of second aspect, the sending node further include: the second detection module；
Second detection module, for carrying out Channel Detection within the idle channel evaluation and test time in the preset time period.
In conjunction with any one of first to the 7th kind of possible embodiment of second aspect, in the tenth kind of possible implementation of second aspect, the sending node further include: third detection module；
The third detection module, for carrying out Channel Detection within the idle channel evaluation and test time in the preset time period.
It is provided by the invention based in the channel evaluating method for exempting from licensed spectrum, contention window length is determined according to the channel detection result in preset time period, determined according to the service condition of channel, thus determine that contention window length can intuitively react the load of current network, so as to guarantee that the contention window determined length is optimal, and then idle channel evaluation and test and data transmission are carried out using the contention window is long, to ensure that the fairness of channel occupancy.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, a brief description of the drawings needed to be used in the description of the embodiments or the prior art will be given below, apparently, drawings in the following description are some embodiments of the invention, for those of ordinary skill in the art, without any creative labor, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is licensed spectrum and the network architecture schematic diagram for exempting from the deployment of licensed spectrum co-sited；
Fig. 2 is the flow diagram provided by the invention based on the channel evaluating method implementation one for exempting from licensed spectrum；
Fig. 3 is the flow diagram provided by the invention based on the channel evaluating method implementation two for exempting from licensed spectrum；
Fig. 4 is the structural schematic diagram of sending node embodiment one provided by the invention；
Fig. 5 is the structural schematic diagram of sending node embodiment two provided by the invention；
Fig. 6 is the structural schematic diagram of sending node embodiment three provided by the invention；
Fig. 7 is the structural schematic diagram of sending node example IV provided by the invention；
Fig. 8 is the structural schematic diagram of sending node embodiment five provided by the invention.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, following will be combined with the drawings in the embodiments of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.
The embodiment of the present invention can be applied to work and exempt from the LTE system in licensed spectrum, i.e. long term evolution (Licensed-Assisted Access using LTE, abbreviation LAA-LTE) system of license auxiliary access.For LAA-LTE system, deployment scenario can be divided into following three kinds:
1, licensed spectrum and exempt from the deployment of licensed spectrum co-sited, i.e., licensed spectrum and exempt from licensed spectrum and polymerize by the same sending node.Fig. 1 is licensed spectrum and the network architecture schematic diagram for exempting from the deployment of licensed spectrum co-sited, as shown in Figure 1, licensed spectrum and exempt from licensed spectrum and be deployed under same sending node, the sending node is using carrier wave polymerization (Carrier Aggregation, abbreviation CA) by two kinds of spectrum aggregatings.
2, licensed spectrum and exempt from the non-co-sited deployment of licensed spectrum, such as licensed spectrum is deployed in macro base station, exempts from licensed spectrum and is deployed in the low power nodes such as Microcell, Home eNodeB.
3, exempt from licensed spectrum to be independently deployed on sending node, i.e., sending node, which only uses, exempts from licensed spectrum, without the use of licensed spectrum.
The embodiment of the present invention can be applied in above-mentioned any deployment scenario, carry out channel evaluation and test for licensed spectrum therein of exempting from.
Fig. 2 is the flow diagram provided by the invention based on the channel evaluating method implementation one for exempting from licensed spectrum, as shown in Fig. 2, this method comprises:
S101, sending node count the channel detection result of the sending node in preset time period, determine that contention window is long according to channel detection result.
It is S102, long according to above-mentioned contention window, to exempting from licensed spectrum and carry out idle channel at least once to evaluate and test.
In the present embodiment, sending node can be base station, be also possible to user equipment, and this is not restricted.
Idle channel evaluation and test specifically: sending node is before licensed spectrum transmission data are exempted from use, first determine whether present channel is idle state, if it is idle state, then directly transmit data, it is on the contrary, a random integers are then generated according to the long corresponding range of contention window, it is assumed for example that a length of q of contention window, then
A random integers N can be generated within the scope of 1 to q, then lasting Channel Detection is carried out as granularity to listen to time slot, often detects a free timeslot, then N is subtracted 1, conversely, N is remained unchanged, after N is kept to 0, immediately begin to send data.Wherein, free timeslot refers to that its corresponding channel is idle state, wherein when the energy detected on channel is lower than a predetermined threshold value, which is defined as idle state.From the foregoing, the contention window long average latency determined before data transmission.
In the present embodiment, contention window length is determined by sending node according to the result detected in preset time period to channel.Specifically, sending node carries out Channel Detection in certain times in a preset period, and the channel detection result of the preset time period is counted in the finish time of the preset period, determine that contention window is long according to the channel detection result, so that detecting idle channel on the basis of the contention window determined in the evaluation and test of idle channel at least once later by this is long, and then send data.
Specifically, above-mentioned preset time period is determined according to preset finish time and preset duration, for example, preset finish time is current time, a length of 5 seconds when preset, then 5 seconds to this period between current time before preset time period is current time.
In the present embodiment, contention window length is determined according to the channel detection result in preset time period, determined according to the service condition of channel, thus determine that contention window length can intuitively react the load of current network, so as to guarantee that the contention window determined length is optimal, and then idle channel evaluation and test and data transmission are carried out using the contention window is long, to ensure that the fairness of channel occupancy.
In another embodiment, above-mentioned steps S101 is specifically included:
Sending node to before exempting from licensed spectrum progress idle channel evaluation and test, counts the channel detection result in preset time period, determines that contention window is long according to channel detection result every time.
Wherein, the finish time of above-mentioned preset time period is at the beginning of idle channel is evaluated and tested.
That is, sending node when starting idle channel evaluation and test, counts the channel detection result in using current time as the period of finish time first, and determine that contention window is long according to this result.
In the present embodiment, sending node every time to exempt from licensed spectrum carry out idle channel evaluation and test before, count the channel detection result in preset time period, determine that contention window is long according to the channel detection result, the contention window length determined is enabled intuitively to react the load of current network, and, what sending node was counted when idle channel is evaluated and tested is the channel detection result in nearest a period of time, therefore, the long contention window determined according to this channel detection result is also most accurately for the reaction of network load.
In another embodiment, above-mentioned steps S101 is specifically included:
Sending node is examined according to the channel detection result in predetermined period statistics preset time period according to channel
It surveys result and determines that contention window is long.
Wherein, the finish time of above-mentioned preset time period is the finish time of the predetermined period.
That is, sending node according to certain period statistical channel testing result, when being in the finish time in the period, counts the channel detection result in using the moment as the period of finish time, and determine that contention window is long according to this result.
In the present embodiment, by the way that a reasonable period is arranged, sending node carrys out statistical channel testing result according to this period, when network load is at light load, a duration shorter period can be set, can guarantee that sending node determines that most reasonable contention window is long according to nearest network load；When network load is that when overloaded, a duration longer period can be set, can guarantee the calculating for no longer carrying out channel usage within a long period, to save overhead.
In another embodiment, the long value range of a length of contention window of the contention window that S101 is determined through the above steps.
Specifically, sending node counts the channel detection result in preset time period, determine that contention window is long according to channel detection result, the a length of value range of the contention window, when carrying out idle channel evaluation and test using the value range, the minimum value in value range is used to carry out idle channel evaluation and test as contention window length first, certain rule is set simultaneously, no longer idle channel evaluation and test is carried out when meeting rule and directly transmits data, when being unsatisfactory for rule, contention window length in value range is doubled, until meeting rule.Above-mentioned rule, which for example may is that, assumes a length of q of current competitive window, and generates the random number N for being less than q greater than 1, if N number of vacant time slot is detected in q time slot, but not limited to this, and rule can be arranged according to the actual situation.
Such as, when the free timeslot of channel in the channel detection result in the preset time period that sending node counts is more, then illustrate network load for underloading, determine that the long value range of contention window is [16 at this time, 1024], when carrying out idle channel evaluation and test using the value range, use minimum value 16 as the long progress idle channel evaluation and test of contention window first, when meeting default rule, directly transmit data, otherwise, continue idle channel evaluation and test using 32 as contention window is long, start to send data after meeting default rule.When the free timeslot number of channel in the channel detection result in the preset time period that sending node counts is moderate, then illustrate that network load is intermediate part load, determine that the long value range of contention window is [128 at this time, 1024], when carrying out idle channel evaluation and test using the value range, use minimum value 128 as the long progress idle channel evaluation and test of contention window first, when meeting default rule, directly transmit data, otherwise, continue idle channel evaluation and test using 256 as contention window is long, starts to send out after meeting default rule
Send data.When the free timeslot of channel in the channel result in the preset time period that sending node counts is less, then illustrate network load for heavy duty, determine that the long value range of contention window is [512 at this time, 1024], when carrying out idle channel evaluation and test using the value range, use minimum value 512 as the long progress idle channel evaluation and test of contention window first, when meeting default rule, directly transmit data, otherwise, continue idle channel evaluation and test using 1024 as contention window is long, starts to send data after meeting default rule.It should be noted that being evaluated and tested again using the minimum value of value range as the long idle channel that continues of contention window if current competitive window length has reached the maximum value in value range and has not been met default rule.
In another embodiment, the long numerical value of a length of contention window of the contention window that S101 is determined through the above steps.
Such as, when the free timeslot of channel in the channel detection result in the preset time period that sending node counts is more, then illustrate network load for underloading, determine that the long numerical value of contention window is 16 at this time, when the free timeslot number of channel in the channel detection result in the preset time period that sending node counts is moderate, then illustrate that network load is intermediate part load, determine that the long numerical value of contention window is 128 at this time, when the free timeslot of channel in the channel detection result in the preset time period that sending node counts is less, then illustrate network load for heavy duty, determine that the long numerical value of contention window is 512 at this time.
After determining the numerical value of contention window length, idle channel evaluation and test is directly carried out according to the numerical value and sends data, it specifically can be with reference to the description evaluated and tested in above-described embodiment one for idle channel.
In another embodiment, the channel detection result of the sending node in above-mentioned steps S101 in sending node statistics preset time period, specifically:
The channel signal energy that sending node in sending node statistics preset time period detects, determines channel detection result according to channel signal energy；
Wherein, above-mentioned preset time period includes at least one unit time.
Specifically, preset time period is made of at least one unit time, and sending node determines the channel detection result of preset time period according to the signal energy in the unit time.
Fig. 3 is the flow diagram provided by the invention based on the channel evaluating method implementation two for exempting from licensed spectrum, as shown in Figure 3, the channel signal energy that sending node in above-mentioned sending node statistics preset time period detects, determines that channel detection result specifically includes according to channel signal energy:
Channel signal energy is greater than the unit time of preset threshold as busy list by the channel signal energy that S201, sending node statistics sending node detect within each unit time for carrying out Channel Detection
Channel signal energy is less than or equal to the unit time of preset threshold as the idle unit time by the position time.
It should be noted that, preset time period is made of at least one unit time, and in entire preset time period, channel signal energy detection might not be all carried out within all unit time, therefore, sending node only counts the unit time for having carried out channel signal energy detection.In these unit time, channel signal energy as the busy unit time, is less than or equal to the unit time of preset threshold as the idle unit time by the unit time that channel signal energy is greater than preset threshold.
S202, using the ratio of total unit time number of carry out Channel Detection included by the number of busy unit time and preset time period as the channel detection result.
It should be noted that above-mentioned total unit time refers to all unit time for carrying out Channel Detection within a preset period of time, when all carrying out Channel Detection in entire preset time period, above-mentioned total unit time is equal to all unit time in preset time period.Otherwise, above-mentioned total unit time is not equal to all unit time in preset time period.
In another embodiment, the channel signal energy that the sending node in above-mentioned sending node statistics preset time period detects determines channel detection result according to channel signal energy specifically:
Sending node counts the channel signal energy that sending node detects in the unit time for carrying out Channel Detection, using the summation of the channel signal energy detected in the unit time for carrying out Channel Detection as channel detection result.
It is using the summation of the channel signal energy detected in the unit time of Channel Detection as channel detection result in the present embodiment, that is, the value of channel detection result is the adduction of energy.
In another embodiment, determine that contention window is long according to channel detection result in above-mentioned steps S101, specifically:
According to the long mapping relations of channel detection result and contention window, determine that contention window is long.
Specifically, channel detection result and contention window it is long between relationship there is specific rule, when unit time number busy in channel detection result is less, then illustrate network load for underloading, correspondingly, the long numerical value of contention window is just smaller；When the unit time number difference of unit time number busy in channel detection result and free time is smaller, then illustrate that network load is intermediate part load, correspondingly, the long numerical value of contention window is with regard to moderate；When unit time number busy in channel detection result is more, then illustrate network load for heavy duty, correspondingly, the long numerical value of contention window is with regard to larger.
Preferably, by emulating or surveying, compare between available channel detection result and contention window length
More accurate mapping relations.For example, when channel detection result is the ratio of busy unit time number and the total unit time number for carrying out Channel Detection, it can be by emulating or surveying to obtain the mapping relations of channel detection result and contention window length.Table 1 is the mapping table long according to the channel detection result and contention window that emulate and actual measurement obtains, as shown in table 1:
Table 1
For example, the channel detection result that sending node counts on is 0.4, i.e., in [0.3,0.5] range, then can determine that the long numerical value of contention window is 32.
Optionally, the contention window determined according to the long mapping relations of channel detection result and contention window is long, it is also possible to the long value range of contention window, after determining the value range of contention window length, subsequent idle channel evaluation and test can be carried out using a determining value by method above-mentioned, details are not described herein again.
In another embodiment, on the basis of the above embodiment 1, can also the first channel detection result of at least one first preset time period before the channel detection result of preset time period described in one and the preset time period through the foregoing embodiment determine that contention window is long.
Specifically, sending node count the preset time period before at least one first preset time period in the sending node first channel detection result, these first channel detection results are recorded by sending node, after the channel detection result for counting on the preset time period, sending node determines that contention window is long according to the corresponding first channel detection result of at least one first preset time period before the corresponding channel detection result of the preset time period and the preset time period.
Optionally, sending node can determine that contention window is long according to the variation tendency of the channel detection result of the preset time period and the first channel detection result of at least one first preset time period.Such as, when channel detection result is the ratio of busy unit time number and the total unit time number for carrying out Channel Detection, it is assumed that the ratio of the busy unit time number detected in the preset time period and the total unit time number for carrying out Channel Detection is ρn, the ratio of the busy unit time number detected in the previous preset time period of the preset time period and the total unit time number for carrying out Channel Detection is ρn-1, then contention window length can be according to ρn-1And ρnRelativeness and the long current value of contention window determine that contention window is long.
For example, as (ρn-ρn-1)/ρnThe long current value of contention window is doubled when greater than a preset threshold, it is long as contention window, as (ρn-ρn-1)/ρnThe long current value of contention window is halved when less than a preset threshold, it is long as contention window, otherwise keep contention window length constant.
In the present embodiment, in addition to the channel detection result in statistics preset time period, also according to the channel detection result of at least one first preset time period before preset time period, to determine that contention window is long jointly.That is, sending node not only allows for current network load, and also contemplate the historical data of network load, according to current network load and historical data, the variation tendency of network load is extrapolated, to determine that contention window is long according to this variation tendency, due to considering the present load and historical data of network, the contention window length determined is enabled to be suitable for current and subsequent idle channel evaluation and test, to more ensure that the fairness of channel occupancy.
In another embodiment, before above-mentioned steps S101, the institute's having time of sending node within a preset period of time carries out Channel Detection.
Specifically, the institute's having time of sending node within a preset period of time all carries out Channel Detection, and no matter whether sending node sends data in the time, and sending node all carries out Channel Detection.
This detection method is that most accurately, the network load condition reflected is also most accurately due to all having carried out Channel Detection, obtained channel detection result in entire preset time period.
In another embodiment, before above-mentioned steps S101, sending node carries out Channel Detection in the idle channel evaluation and test time within a preset period of time.
Specifically, the institute's having time of sending node not within a preset period of time all carries out Channel Detection, but is multiplexed that idle channel is evaluated and tested as a result, only Channel Detection is carried out when idle channel is evaluated and tested, all without Channel Detection in remaining time.When network load is heavier, this detection method can save overhead to greatest extent, so that network load no longer aggravates.
In another embodiment, before above-mentioned steps S101, Channel Detection is carried out in the time for not sending data of sending node within a preset period of time.
As long as the time for not sending data may include the idle channel evaluation and test time it should be noted that the time that sending node does not send data all carries out Channel Detection.
Those of ordinary skill in the art will appreciate that: realizing all or part of the steps of above method embodiment, this can be accomplished by hardware associated with program instructions, program above-mentioned can be stored in a computer readable storage medium, the program when being executed, executes step including the steps of the foregoing method embodiments；And storage medium above-mentioned includes: various Jie that can store program code such as ROM, RAM, magnetic or disk
Matter.
Fig. 4 is the structural schematic diagram of sending node embodiment one provided by the invention, as shown in figure 4, the sending node includes:
Determining module 401 determines that contention window is long according to the channel detection result for counting the channel detection result of the sending node in preset time period.
Evaluation and test module 402 carries out idle channel evaluation and test at least once to licensed spectrum is exempted from for long according to the contention window.
The sending node can be base station, be also possible to user equipment, and this is not restricted.
The sending node is for executing preceding method embodiment, and it is similar that the realization principle and technical effect are similar, and details are not described herein.
In another embodiment, determining module 401 is specifically used for, and every time to before exempting from the licensed spectrum progress idle channel evaluation and test, counts the channel detection result of the sending node in preset time period, determines that contention window is long according to the channel detection result.
Wherein, the finish time of the preset time period is at the beginning of idle channel is evaluated and tested.
In another embodiment, determining module 401 is specifically used for, and according to the channel detection result of the sending node in predetermined period statistics preset time period, determines that contention window is long according to the channel detection result.
Wherein, the finish time of the preset time period is the finish time of the predetermined period.
In another embodiment, determining module 401 is used to count the channel detection result of the sending node in preset time period, specifically: the channel signal energy that the sending node in statistics preset time period detects determines channel detection result according to the channel signal energy.
Wherein, the preset time period includes at least one unit time.
In another embodiment, determining module 401 is specifically used for the channel signal energy that the sending node in statistics preset time period detects, channel detection result is determined according to the channel signal energy, specifically: count the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, channel signal energy as the busy unit time, is less than or equal to the unit time of preset threshold as the idle unit time by the unit time that channel signal energy is greater than preset threshold；Using the ratio of total unit time number of carry out Channel Detection included by the number of the busy unit time and the preset time period as the channel detection result.
In another embodiment, determining module 40 is specifically used for the transmission section in statistics preset time period
The channel signal energy that point detects, channel detection result is determined according to the channel signal energy, specifically: the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection is counted, using the summation of the channel signal energy detected in each unit time for carrying out Channel Detection as the channel detection result.
In another embodiment, determining module 401 is used to determine that contention window is long according to the channel detection result, specifically: according to the long mapping relations of the channel detection result and contention window, determine that contention window is long.
In another embodiment, determining module 401 be also used to count the preset time period before at least one first preset time period in the sending node first channel detection result.
Correspondingly, determining module 401 is used to determine that contention window is long according to the channel detection result, specifically: according to the corresponding first channel detection result of at least one first preset time period before the corresponding channel detection result of the preset time period and the preset time period, determine that the contention window is long.
Fig. 5 is the structural schematic diagram of sending node embodiment two provided by the invention, as shown in figure 5, the sending node further includes first detection module 403, carries out Channel Detection for institute's having time in the preset time period.
Fig. 6 is the structural schematic diagram of sending node embodiment three provided by the invention, as shown in fig. 6, the sending node further includes the second detection module 404, for carrying out Channel Detection within the idle channel evaluation and test time in the preset time period.
Fig. 7 is the structural schematic diagram of sending node example IV provided by the invention, as shown in fig. 7, the sending node further includes third detection module 405, for carrying out Channel Detection in the time for not sending data in the preset time period.
The sending node is for executing preceding method embodiment, and it is similar that the realization principle and technical effect are similar, and details are not described herein.
Fig. 8 is the structural schematic diagram of sending node embodiment five provided by the invention, as shown in figure 8, the sending node includes: memory 501 and processor 502.
The memory is used to call the program instruction in the memory for storing program instruction, the processor, executes following methods:
The channel detection result for counting the sending node in preset time period, determines that contention window is long according to the channel detection result.
It is long according to the contention window, idle channel evaluation and test at least once is carried out to licensed spectrum is exempted from.
Further, the processor is for every time to exempting from licensed spectrum and carry out the idle channel to evaluate and test it
Before, the channel detection result of the sending node in preset time period is counted, determines that contention window is long according to the channel detection result.
Wherein, the finish time of the preset time period is at the beginning of idle channel is evaluated and tested.
Further, the processor is used to determine that contention window is long according to the channel detection result according to the channel detection result of the sending node in predetermined period statistics preset time period.
Wherein, the finish time of the preset time period is the finish time of the predetermined period.
Further, the processor determines channel detection result according to the channel signal energy for counting the channel signal energy that the sending node in preset time period detects.
Wherein, the preset time period includes at least one unit time.
Further, the processor is used to count the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, channel signal energy as the busy unit time, is less than or equal to the unit time of preset threshold as the idle unit time by the unit time that channel signal energy is greater than preset threshold；Using the ratio of total unit time number of carry out Channel Detection included by the number of the busy unit time and the preset time period as the channel detection result.
Further, the processor is used to count the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, using the summation of the channel signal energy detected in each unit time for carrying out Channel Detection as the channel detection result.
Further, the processor is used for the mapping relations long according to the channel detection result and contention window, determines that contention window is long.
Further, the first channel detection result of the sending node at least one first preset time period before the processor is used to count the preset time period.
Correspondingly, the processor is used to determine that the contention window is long according to the corresponding first channel detection result of at least one first preset time period before the corresponding channel detection result of the preset time period and the preset time period.
Further, the processor carries out Channel Detection for institute's having time in the preset time period.
Further, the processor is used to carry out Channel Detection within the idle channel evaluation and test time in the preset time period.
Further, the processor within the time for not sending data in the preset time period for carrying out Channel Detection.
The sending node is for executing preceding method embodiment, and it is similar that the realization principle and technical effect are similar, and details are not described herein.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；Although present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments, or equivalent substitution of some or all of the technical features；And these are modified or replaceed, the range for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (22)
- It is a kind of based on the channel evaluating method for exempting from licensed spectrum characterized by comprisingSending node counts the channel detection result of the sending node in preset time period, determines that contention window is long according to the channel detection result；It is long according to the contention window, idle channel evaluation and test at least once is carried out to licensed spectrum is exempted from.
- The method according to claim 1, wherein the channel detection result of the sending node in the sending node statistics preset time period, determines that contention window is long according to the channel detection result, comprising:Sending node to before exempting from the licensed spectrum progress idle channel evaluation and test, counts the channel detection result of the sending node in preset time period, determines that contention window is long according to the channel detection result every time；At the beginning of the finish time of the preset time period is idle channel evaluation and test.
- The method according to claim 1, wherein the channel detection result of the sending node in the sending node statistics preset time period, determines that contention window is long according to the channel detection result, comprising:Sending node determines that contention window is long according to the channel detection result according to the channel detection result of the sending node in predetermined period statistics preset time period；The finish time of the preset time period is the finish time of the predetermined period.
- The method according to claim 1, wherein the channel detection result of the sending node in the sending node statistics preset time period, comprising:The channel signal energy that the sending node in sending node statistics preset time period detects, determines channel detection result according to the channel signal energy；Wherein, the preset time period includes at least one unit time.
- According to the method described in claim 4, it is characterized in that, the channel signal energy that the sending node in sending node statistics preset time period detects, determines channel detection result according to the channel signal energy, comprising:Sending node counts the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, channel signal energy as the busy unit time, is less than or equal to the unit time of preset threshold as the idle unit time by the unit time that channel signal energy is greater than preset threshold；Using the ratio of total unit time number of carry out Channel Detection included by the number of the busy unit time and the preset time period as the channel detection result.
- According to the method described in claim 4, it is characterized in that, the channel signal energy that the sending node in sending node statistics preset time period detects, determines channel detection result according to the channel signal energy, comprising:Sending node counts the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, using the summation of the channel signal energy detected in each unit time for carrying out Channel Detection as the channel detection result.
- Method according to claim 1-6, which is characterized in that described to determine that contention window is long according to the channel detection result, comprising:According to the long mapping relations of the channel detection result and contention window, determine that contention window is long.
- Method according to claim 1-7, which is characterized in that the first channel detection result of the sending node at least one first preset time period before counting the preset time period the method also includes: the sending node；Correspondingly,The sending node determines that contention window is long according to the channel detection result, comprising:The sending node determines that the contention window is long according to the corresponding first channel detection result of at least one first preset time period before the corresponding channel detection result of the preset time period and the preset time period.
- Method according to claim 1-8, which is characterized in that the channel detection result of the sending node in sending node statistics preset time period, before determining that contention window is long according to the channel detection result, further includes:Institute having time of the sending node in the preset time period carries out Channel Detection.
- Method according to claim 1-8, which is characterized in that the channel detection result of the sending node in sending node statistics preset time period, before determining that contention window is long according to the channel detection result, further includes:The sending node carries out Channel Detection within the idle channel evaluation and test time in the preset time period.
- Method according to claim 1-8, which is characterized in that the channel detection result of the sending node in sending node statistics preset time period, before determining that contention window is long according to the channel detection result, further includes:The sending node carries out channel inspection within the time for not sending data in the preset time period It surveys.
- A kind of sending node characterized by comprisingDetermining module determines that contention window is long according to the channel detection result for counting the channel detection result of the sending node in preset time period；Evaluation and test module carries out idle channel evaluation and test at least once to licensed spectrum is exempted from for long according to the contention window.
- Sending node according to claim 12, it is characterized in that, the determining module, it is specifically used for, every time to exempting from before licensed spectrum carries out the idle channel evaluation and test, the channel detection result for counting the sending node in preset time period, determines that contention window is long according to the channel detection result；Wherein, the finish time of the preset time period is at the beginning of idle channel is evaluated and tested.
- Sending node according to claim 12, which is characterized in that the determining module is specifically used for, and according to the channel detection result of the sending node in predetermined period statistics preset time period, determines that contention window is long according to the channel detection result；Wherein, the finish time of the preset time period is the finish time of the predetermined period.
- Sending node according to claim 12, it is characterized in that, the determining module is used to count the channel detection result of the sending node in preset time period, specifically: the channel signal energy that the sending node in statistics preset time period detects determines channel detection result according to the channel signal energy；Wherein, the preset time period includes at least one unit time.
- Sending node according to claim 15, it is characterized in that, the determining module is specifically used for the channel signal energy that the sending node in statistics preset time period detects, channel detection result is determined according to the channel signal energy, specifically: count the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection, channel signal energy as the busy unit time, is less than or equal to the unit time of preset threshold as the idle unit time by the unit time that channel signal energy is greater than preset threshold；Using the ratio of total unit time number of carry out Channel Detection included by the number of the busy unit time and the preset time period as the channel detection result.
- Sending node according to claim 15, it is characterized in that, the determining module is specifically used for the channel signal energy that the sending node in statistics preset time period detects, channel detection result is determined according to the channel signal energy, specifically: the channel signal energy that the sending node detects within each unit time for carrying out Channel Detection is counted, each unit of Channel Detection will be carried out The summation of the channel signal energy detected in time is as the channel detection result.
- The described in any item sending nodes of 2-17 according to claim 1, it is characterized in that, the determining module, for determining that contention window is long according to the channel detection result, specifically: according to the long mapping relations of the channel detection result and contention window, determine that contention window is long.
- The described in any item sending nodes of 2-18 according to claim 1, which is characterized in that the determining module, the first channel detection result of the sending node at least one first preset time period before being also used to count the preset time period；Correspondingly,The determining module, for determining that contention window is long according to the channel detection result, specifically: according to the corresponding first channel detection result of at least one first preset time period before the corresponding channel detection result of the preset time period and the preset time period, determine that the contention window is long.
- The described in any item sending nodes of 2-19 according to claim 1, which is characterized in that further include: first detection module；The first detection module carries out Channel Detection for institute's having time in the preset time period.
- The described in any item sending nodes of 2-19 according to claim 1, which is characterized in that further include: the second detection module；Second detection module, for carrying out Channel Detection within the idle channel evaluation and test time in the preset time period.
- The described in any item sending nodes of 2-19 according to claim 1, which is characterized in that further include: third detection module；The third detection module, for carrying out Channel Detection within the time for not sending data in the preset time period.
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| PCT/CN2015/087094 WO2017028057A1 (en) | 2015-08-14 | 2015-08-14 | Channel assessment method based on license exempt spectrum and sending node |
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| CN102413582A (en) * | 2012-01-06 | 2012-04-11 | 北京邮电大学 | Method for accessing 802.11 wireless network channel under centralized control |
| CN102711130A (en) * | 2012-06-08 | 2012-10-03 | 深圳大学 | Method and system for determining contention window in adaptive back-off algorithm |
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| US20060239225A1 (en) * | 2004-12-14 | 2006-10-26 | Cho Hyeon C | Channel selecting method of wireless local area network using remote scanning and wireless local area network system thereof |
| CN102413582A (en) * | 2012-01-06 | 2012-04-11 | 北京邮电大学 | Method for accessing 802.11 wireless network channel under centralized control |
| CN102711130A (en) * | 2012-06-08 | 2012-10-03 | 深圳大学 | Method and system for determining contention window in adaptive back-off algorithm |
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