CN106455108A - Listen Before Talk method and Listen Before Talk device - Google Patents
Listen Before Talk method and Listen Before Talk device Download PDFInfo
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- CN106455108A CN106455108A CN201510483745.2A CN201510483745A CN106455108A CN 106455108 A CN106455108 A CN 106455108A CN 201510483745 A CN201510483745 A CN 201510483745A CN 106455108 A CN106455108 A CN 106455108A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
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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
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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Abstract
The invention discloses a Listen Before Talk method and a Listen Before Talk device. The Listen Before Talk method comprises steps that a frequency domain distance between carrier waves or carrier wave sets is determined; when the frequency domain distance is greater than a preset value, the Listen Before Talk operations of the carriers or the carrier waves are respectively carried out; when the frequency domain distance is smaller than the preset value, the Listen Before Talk operations of the carriers or the carrier waves are synchronously carried out. A problem of a prior art that the Listen Before Talk operations cannot be carried out, when an unauthorized frequency band is provided with a plurality of carrier waves or carrier wave sets.
Description
Technical field
The present invention relates to wireless communication technology field, first listen particularly to one kind and saying method and device.
Background technology
Unlicensed spectrum does not plan specific application system, can for various wireless communication system such as bluetooth,
WiFi etc. shares, using shared unlicensed spectrum resource by way of preempting resources between multiple systems.Therefore
Different operators deployment LTE-U (Unlicensed LTE, unauthorized LTE, referred to as U-LTE or
LTE-U；LTE：Long Term Evolution, Long Term Evolution) between and its LTE-U and WiFi etc. wireless
The compossibility of communication system is an emphasis and the difficult point of research.3GPP requires to ensure LTE-U and WiFi
Deng the fair co-existence of wireless communication system, unauthorized frequency range is assisted by the main carrier authorizing frequency range as secondary carrier
Realize.LBT (listen Before Talk, first listen and saying) as the basic means of LTE-U contention access,
Obtain the approval of nearly all company.
802.11 systems adopt Channel Access Mechanism to be referred to as CSMA/CA (Carrier Sense Multiple
Access/Collision Avoidance, Carrier Sense Multiple access/conflict avoidance) mechanism, Fig. 1 is WiFi
Preempting resources schematic diagram in unlicensed spectrum, as illustrated, WiFi system is in unlicensed spectrum
During preempting resources, first channel is monitored, when the channel is idle between reach DIFS (DCF Inter-Frame
Space, DCF frame pitch；DCF:distributed channel access:Distributed channel accesses), just sentence
Disconnected present channel is idle channel, the then website of the channel to be accessed such as each, just enters one and returns at random
Move back the stage, be used for avoiding multiple websites to collide in identical resource.Additionally, in order to guarantee fairness,
It further provides that each website can not take frequency spectrum resource for a long time, when reaching certain time or the volume of transmitted data upper limit,
Need to discharge resource, for other WiFi or LTE system preempting resources.
In order to provide a flexible, fair adaptive channel access mechanism, European requirements are unauthorized
5150-5350MHz adopts LBT technology with 5470-5725MHz frequency range, and LBT process is similar to WiFi
CSMA/CA mechanism, CCA (Clear Channel to be carried out before each equipment utilization channel
Assessment, clear channel assessment (CCA)) detection.Using energy measuring, CCA judges whether present channel has
Signal transmission, and then determine whether channel is occupied.ETSI(European Telecommunications
Standards Institute, ETSI European Telecommunications Standards Institute) device class of unauthorized frequency range is by standard
Frame-based (based on frame) and load-based (based on load), corresponds to two class access mechanisms respectively：
FBE (Frame Based Equipment, the equipment based on frame) and LBE (Load Based Equipment,
Equipment based on load), Fig. 2 a is ETSI FBE Channel Access Mechanism schematic diagram, and Fig. 2 b is ETSI LBE
Option B Channel Access Mechanism schematic diagram, such as Fig. 2 a, shown in Fig. 2 b, FBE, LBE access mechanism is such as
Under：
FBE accesses in fixing frame structure position execution CCA detection, as long as channel has a CCA cycle
(being not less than 20us) is judged as that sky just accesses channel at once, initiates data transmission procedure, channel transmission time
Holding time is relatively fixed, minimum 1ms maximum 10ms, and idling cycle should be at least Channel holding time
5%, equipment execution new CCA detection within the CCA time of the afterbody of idling cycle accesses letter again
Road.In FBE mechanism, Channel holding time adds idle (idle) cycle is that a fixed value is referred to as frame
Period (frame period).
In LBE Channel Access Mechanism, transmission every time is all variable to the holding time of channel with starting point,
Obtain channel before to be extended CCA detection, first according to CW (contention window, competing
Strive window) size q, produce random factor N, until idle time of channel reaches the CCA time
N times, and channel be spare time, just access channel, initiate data transmission procedure, maximum Channel holding time
For 13ms.ETSI LBE is divided into option A and two kinds of options of option B, wherein ETSI option B
Competition window is fixing, is most basic LBE form.
By the way of WiFi adopts the expansion of competition window index when CSMA/CA access mechanism, minimum
CW is set to 15=24-1 time slot, after the transmission of two websites collides, will be by during competition next time
Competition window doubles to expand as 31=25-1, and CW maximum can be 1023.In order to realize LTE-U and WiFi
Fair co-existence, when using LBT mechanism based on LBE, the research conclusion of current 3GPP is, right
Downlink transfer LBT, should based on ETSI LBE option B revise it should using based on load LBT and
And competition window is that index increases or is semi-statically configured, similar to the DIFS interval of WiFi, LTE-U
It has been required for one before starting ECCA (extended CCA, extension CCA detection) countdown every time
Defer (delay) similar to DIFS.The unauthorized carrier wave being all based in a LTE-U discussed above
On carry out LBT.
The present Research of 3GPP is to define two classes LBT for based on the transmission of load, referred to as at present
LBT category 3 and LBT category 4.LBT category 3 adopts fixing competition window, such as
LBEoption B just belongs to LBT category 3；And LBT category 4 is based on ETSI LBEoption
B revise, using the LBT based on load and competition window be index increase or be semi-statically configured；
Similar to the DIFS interval of WiFi, LBT category 4 is required for before starting ECCA countdown every time
There is a defer similar to DIFS.
The deficiencies in the prior art are：Although prior art has carrying out on the unauthorized carrier wave of a LTE-U
The scheme of LBT, but do not carry out the technical scheme of LBT when unauthorized frequency range has multiple carrier wave.
Content of the invention
The invention provides a kind of LBT method and device, in order to solve when unauthorized frequency range have multicarrier or
It is impossible to carry out the problem of LBT during multicarrier set.
A kind of LBT method is provided in the embodiment of the present invention, including：
Determine between carrier wave and carrier wave, or the frequency domain distance between carrier set and carrier set；
When frequency domain distance is more than preset value, LBT operation is carried out on carrier wave or carrier set respectively；
When frequency domain distance is less than preset value, synchronization on carrier wave or carrier set carries out LBT operation.
It is preferred that LBT operation is carried out respectively on carrier wave or carrier set, including：In different carrier waves
Or the LBT operation for upstream or downstream transmission is carried out respectively on carrier set.
It is preferred that when carrier wave or carrier set are located at different frequency ranges respectively, described in carrier wave or carrier wave
Collection closes and carries out LBT operation respectively, including：On carrier wave on different frequency bands or carrier set respectively
Carry out the LBT operation for upstream or downstream transmission；
When carrier wave or carrier set are located at same frequency range, described carry out respectively on carrier wave or carrier set
LBT operates, including：The distance of intercarrier is more than the carrier wave of preset value or carrier set is used respectively
LBT operation in upstream or downstream transmission.
It is preferred that further including：
When carrier set is located at different frequency ranges respectively, in carrier set on different frequency bands, synchronous point
Do not carry out the LBT operation for upstream or downstream transmission；
When carrier set is located at same frequency range, in carrier set, synchronous carry out respectively for up or under
The LBT operation of row transmission.
It is preferred that described synchronously carry out LBT operation on carrier wave or carrier set, including：
Determine main carrier and from carrier wave in each carrier wave；
A kind of detection of access way is carried out on main carrier, another kind of access way is being carried out on carrier wave
Detection；
According to the testing result on main carrier, when main carrier accesses channel, if the detection knot from carrier wave
Fruit is the spare time, accesses channel in main carrier with from carrier wave, if the testing result from carrier wave is busy, abandons
Main carrier and access channel from carrier wave；
Or,
Determine main carrier set and from carrier set in each carrier set；
A kind of detection of access way is carried out on main carrier set, connects another kind is carried out on carrier set
Enter the detection of mode；
The testing result closed according to main carrier collection, when main carrier collection closes access channel, if from carrier set
The testing result closed is the spare time, accesses channel in main carrier set with from carrier set, if from carrier set
On testing result be busy, abandon main carrier set with from carrier set access channel.
It is preferred that carry out on main carrier or main carrier set is detected as ECCA；And/or, from carrier wave
Or carry out from carrier set be detected as ICCA.
It is preferred that main carrier or main carrier set are determined by one of following manner or a combination thereof：
Main carrier or main carrier set, the system according to channel busy degree are determined according to the busy idle information of feedback channel
Meter information determines main carrier or main carrier set, determines main carrier or main carrier according to channel real-time detection information
Set, random selection main carrier or main carrier set.
A kind of LBT device is provided in the embodiment of the present invention, including：
Frequency domain apart from determining module, for determining between carrier wave and carrier wave, or carrier set and carrier set it
Between frequency domain distance；
LBT operation module, for when frequency domain distance is more than preset value, distinguishing on carrier wave or carrier set
Carry out LBT operation；When frequency domain distance is less than preset value, synchronization on carrier wave or carrier set carries out LBT
Operation.
It is preferred that LBT operation module is further used on carrier wave or carrier set carrying out LBT behaviour respectively
When making, the LBT behaviour for upstream or downstream transmission is carried out on different carrier waves or carrier set respectively
Make.
It is preferred that LBT operation module is further used for being located at different frequencies respectively in carrier wave or carrier set
Section, when LBT operation is carried out respectively on carrier wave or carrier set, carrier wave on different frequency bands or load
Ripple collection closes and carries out respectively operating for the LBT of upstream or downstream transmission；In carrier wave or carrier set position
In same frequency range, when LBT operation is carried out respectively on carrier wave or carrier set, will be big for the distance of intercarrier
Carry out the LBT operation for upstream or downstream transmission in the carrier wave of preset value or carrier set respectively.
It is preferred that LBT operation module is further used for when carrier set is located at different frequency ranges respectively,
In carrier set on different frequency range, the synchronous LBT operation carrying out respectively for upstream or downstream transmission；
When carrier set is located at same frequency range, in carrier set, synchronization carries out passing for upstream or downstream respectively
Defeated LBT operation.
It is preferred that LBT operation module is further used for synchronization on carrier wave or carrier set carries out LBT behaviour
When making：
Determine main carrier and from carrier wave in each carrier wave；
A kind of detection of access way is carried out on main carrier, another kind of access way is being carried out on carrier wave
Detection；
According to the testing result on main carrier, when main carrier accesses channel, if the detection knot from carrier wave
Fruit is the spare time, accesses channel in main carrier with from carrier wave, if the testing result from carrier wave is busy, abandons
Main carrier and access channel from carrier wave；
Or,
Determine main carrier set and from carrier set in each carrier set；
A kind of detection of access way is carried out on main carrier set, connects another kind is carried out on carrier set
Enter the detection of mode；
The testing result closed according to main carrier collection, when main carrier collection closes access channel, if from carrier set
The testing result closed is the spare time, accesses channel in main carrier set with from carrier set, if from carrier set
On testing result be busy, abandon main carrier set with from carrier set access channel.
It is preferred that LBT operation module is further used for carrying out ECCA on main carrier or main carrier set；
And/or, from carrier wave or ICCA is carried out from carrier set.
It is preferred that LBT operation module is further used for determining main load by one of following manner or a combination thereof
Ripple or main carrier set：
Main carrier or main carrier set, the system according to channel busy degree are determined according to the busy idle information of feedback channel
Meter information determines main carrier or main carrier set, determines main carrier or main carrier according to channel real-time detection information
Set, random selection main carrier or main carrier set.
The present invention has the beneficial effect that：
In technical scheme provided in an embodiment of the present invention, due to according between each carrier wave or carrier set
Frequency domain distance, to determine how and to carry out LBT operation, therefore, solves in prior art and does not exist when non-
Frequency range is authorized to have when multicarrier or multicarrier set it is impossible to carry out the problem of LBT.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes of the present invention
Point, the schematic description and description of the present invention is used for explaining the present invention, does not constitute to the present invention not
Work as restriction.In the accompanying drawings：
Fig. 1 is preempting resources schematic diagram in unlicensed spectrum for the WiFi in background technology；
Fig. 2 a is ETSI FBE Channel Access Mechanism schematic diagram in background technology；
Fig. 2 b is ETSI LBE option B Channel Access Mechanism schematic diagram in background technology；
Fig. 3 is LBT method implementation process diagram in the embodiment of the present invention；
Fig. 4 is multi-carrier synchronization LBT schematic diagram in the embodiment of the present invention；
Fig. 5 is LBT apparatus structure schematic diagram in the embodiment of the present invention；
Fig. 6 is communication apparatus construction schematic diagram in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is illustrated.
Although it is unauthorized based on a LTE-U that inventor notices that during invention prior art has
The scheme of LBT is carried out on carrier wave, but does not carry out the skill of LBT when unauthorized frequency range has multiple carrier wave
Art scheme.However, LTE-U there may be multiple free time carrier waves in unauthorized frequency range, multiple carrier waves can be
Adjacent can also be discontinuous, then just can be bigger by reusing the method acquisition of LTE carrier aggregation
Bandwidth.
Similar to WiFi, each carrier wave of current LTE-U is 20M, and adjacent carrier certainly exists RF (Radio
Frequency, radio frequency) reveal, if a carrier wave is just in sending signal, even if adjacent carrier wave is in sky
Not busy state, due to adjacent-channel interference, the result of LBT energy measuring is also busy it is therefore desirable to each carrier wave is same
Step carries out LBT, synchronous transfer.
Based on this, propose one kind in the embodiment of the present invention in unauthorized frequency range, base station or terminal access are many
The scheme of individual carrier wave.Predominantly：When frequency domain distance between intercarrier or carrier set is more than preset value, base
Stand or LBT that terminal is carried out on carrier wave or carrier set can be mutual independence；When intercarrier or load
When between ripple set, frequency domain distance is less than preset value, base station or terminal are synchronous on this carrier wave or carrier set
Carry out LBT operation, be illustrated below.
Fig. 3 is LBT method implementation process diagram, as illustrated, can include：
Step 301, determine between carrier wave and carrier wave, or the frequency domain distance between carrier set and carrier set；
Step 302, when frequency domain distance is more than preset value, LBT is carried out respectively on carrier wave or carrier set
Operation；When frequency domain distance is less than preset value, synchronization on carrier wave or carrier set carries out LBT operation.
In enforcement, when determining the preset value of frequency domain distance, can by the interference between adjacent carrier whether
To determine less than certain thresholding, for example ,-the 6db that typically now adopts, concrete thresholding be how many need to regard real
Border needs and equipment situation determines, determines that the purpose of frequency domain distance is to determine the degree of interference, therefore originally
Skilled person easily knows how to determine this preset value according to practical situation.
In enforcement, base station or terminal determine between the carrier wave needing to carry out LBT or carrier set first
Between frequency domain distance, frequency domain distance can carry out solely respectively more than the carrier wave of predeterminable range or carrier set
Vertical LBT operation, and frequency domain distance then synchronously carries out LBT less than the carrier wave of predeterminable range or carrier set
Operation.
For more fully understanding, illustrated with example below.
Embodiment 1
In this example, carrier wave or carrier set carry out LBT operation respectively, can include：Different
LBT operation for upstream or downstream transmission is carried out respectively on carrier wave or carrier set.
Specifically, when carrying out the distance metric of carrier wave or carrier set, if two carrier waves or two loads
Ripple collection is located at two band (frequency range), particularly two non-conterminous band respectively, and for example, one in 2.4G
Frequency range, one is much larger than the pre- of frequency domain distance in 5G frequency range, the now distance between carrier wave or carrier set
If value, then the carrier set on different band is respectively used to different transmission, such as on different band
Independently carry out DL (Downlink, downlink) and UL (Uplink, up-link) to transmit, now
LBT on this two band is separate, namely：It is located at respectively in carrier wave or carrier set
During different frequency range, carrier wave or carrier set carry out LBT operation respectively, can include：In difference
LBT operation for upstream or downstream transmission is carried out respectively on the carrier wave in frequency range or carrier set.Tool
When body is implemented, LBT main carrier can be configured on each band, each band is according to the LBT being configured
Main carrier independently carries out LBT operation.
If multiple carrier waves or carrier set are located in same band it may be necessary to different carrier waves or load
Whether ripple set is respectively used to DL and UL and transmits, now may be used judging the distance between carrier wave or carrier set
Independently to carry out LBT operation, can be with two nearest in two carrier waves or two carrier set distances
Between frequency domain distance measuring naturally it is also possible to adopt alternate manner.Can according to measurement intercarrier away from
From with default frequency domain with a distance from determine multiple carrier set that can be used for independent LBT, base station or terminal can
So that independent LBT to be carried out respectively on these carrier set, for DL or UL transmission, can be such as one
One DL LBT main carrier of DL transmission configuration in individual band, is one UL LBT of UL transmission configuration
Main carrier is respectively used to DL and UL and independently carries out LBT.That is, be located at same in carrier wave or carrier set
During one frequency range, carrier wave or carrier set carry out LBT operation respectively, can include：By intercarrier
Distance carries out the LBT behaviour for upstream or downstream transmission respectively more than the carrier wave of preset value or carrier set
Make.
In being embodied as it is not excluded that base station or terminal meet, at these, the load that frequency domain distance is more than preset value
Ripple collection closes, and synchronously carrying out LBT aggregates into a bigger bandwidth, such as on two band, each band
LBT is synchronously carried out according to its respective LBT main carrier, and two LBT main carriers also keep synchronous,
One big bandwidth is aggregated on each band, if the carrier synchronization of two band polymerizations accesses channel, just
Aggregate into a bigger bandwidth across band, if the carrier wave of two band polymerizations can not keep synchronous accesses letter
Road, just independently transmits.That is, when carrier set is located at different frequency ranges respectively, in different frequency range
On carrier set on, the synchronous LBT operation carrying out respectively for upstream or downstream transmission.
In enforcement, when carrier set is located at same frequency range it is also possible in carrier set, synchronization is entered respectively
Row is for the LBT operation of upstream or downstream transmission.Specifically, between carrier set, distance is more than preset value
When independently can be carried out with LBT, if in a band, the carrier set at two meets and independently carries out LBT
Condition when, equally can also be by the way of synchronous LBT.
Embodiment 2
In this example, when when between carrier wave or carrier set, frequency domain distance is less than preset value, base station or terminal can
Synchronously to carry out LBT in the carrier wave meeting condition or carrier set.That is, it is same on carrier wave or carrier set
Step carries out LBT operation, including：
Determine main carrier and from carrier wave in each carrier wave；
A kind of detection of access way is carried out on main carrier, another kind of access way is being carried out on carrier wave
Detection；
According to the testing result on main carrier, when main carrier accesses channel, if the detection knot from carrier wave
Fruit is the spare time, accesses channel in main carrier with from carrier wave, if the testing result from carrier wave is busy, abandons
Main carrier and access channel from carrier wave；
Or,
Determine main carrier set and from carrier set in each carrier set；
A kind of detection of access way is carried out on main carrier set, connects another kind is carried out on carrier set
Enter the detection of mode；
The testing result closed according to main carrier collection, when main carrier collection closes access channel, if from carrier set
The testing result closed is the spare time, accesses channel in main carrier set with from carrier set, if from carrier set
On testing result be busy, abandon main carrier set with from carrier set access channel.
In enforcement, when determining main carrier and from carrier wave, the middle determination from each carrier wave or carrier set referring to
Master slave relation, does not mean that the main carrier in LTE-U and secondary carrier, this is because usual people in the art
Member thinks that the main carrier in LTE-U refers to authorize the LTE carrier wave of frequency range, all loads of unauthorized frequency range
Ripple is secondary carrier.
In being embodied as, the scheme that base station or terminal synchronously carry out LBT can be as follows：
Network or base station or terminal are that unauthorized frequency range needs the synchronous carrier set configuration carrying out LBT
One is used for carrying out the main carrier of LBT, determines main carrier or master by one of following manner or a combination thereof
Carrier set：Main carrier or main carrier set are determined according to the busy idle information of feedback channel, according to channel busy journey
Degree statistical information determine main carrier or main carrier set, determined according to channel real-time detection information main carrier or
Main carrier set, random selection main carrier or main carrier set.
Base station or terminal, on this LBT main carrier, according to fixing competition window, or dynamic expand
Competition window, or the competition window being semi-statically configured, produce the time slot needing random back or need to examine
The idle CCA number of time slots surveyed, carries out ECCA detection, non-LBT main carrier on LBT main carrier
Do not carried out random back before LBT main carrier accesses channel, do not execute ECCA detection, only carry out ICCA
(Initial CCA, initial CCA) detects, if not LBT main carrier is when LBT main carrier accesses channel,
ICCA testing result is the spare time, and non-LBT main carrier just accesses channel together with LBT main carrier, if ICCA
Result is to hurry in just abandoning this access channel, and ICCA needs the slot length of detection can configure.
In enforcement, the LBT main carrier in above-described embodiment is one with the access way of LBT secondary carrier
Example, but it is not precluded from the combination using other access ways, for example, LBT main carrier adopts LBT
The access way of category 4, and the access way of LBT category 3 is adopted on LBT secondary carrier.
In enforcement, in above-described embodiment, the main carrier for carrying out LBT of configuration is one, but this Shen
Scheme please is not merely only applicable to for the LBT main carrier in same band to be limited to one, implements
In can also adopt multiple, at least DL can be respectively adopted different LBT main carriers from UL, is all down
Row can also optionally with need to be configured to multiple descending LBT main carriers, in enforcement, exceed frequency domain distance
Just can be by with the way of in using embodiment.
Multiple carrier waves need synchronization to carry out LBT, and main purpose can increase aggregate bandwidth, can avoid phase again
Adjacent or phase Adjacent Channel RF reveals interference LBT, and Fig. 4 is multi-carrier synchronization LBT schematic diagram, as illustrated,
20M LBT carrier wave randomly generates backoff (rollback) according to competition window, starts ECCA detection process,
Once LBT successfully accesses channel, and other non-LBT LTE-U carrier wave only carries out ICCA detection, root
Decide whether to access channel according to ICCA testing result.Fig. 4 is a multi-carrier synchronization LBT example, and
It is not excluded for other multi-carrier synchronization LBT.LBT main carrier uses the LBT based on load in the diagram,
Being not precluded from frame based LBT or random back is other LBT modes of fixed value.
Based on same inventive concept, additionally provide a kind of LBT device in the embodiment of the present invention, due to this dress
The principle putting solve problem is similar to a kind of LBT method, and the enforcement of therefore this device may refer to method
Implement, repeat no more in place of repetition.
Fig. 5 is LBT apparatus structure schematic diagram, as illustrated, can include in device：
Frequency domain apart from determining module 501, for determining between carrier wave and carrier wave, or carrier set and carrier set
Frequency domain distance between conjunction；
LBT operation module 502, for when frequency domain distance is more than preset value, on carrier wave or carrier set
Carry out LBT operation respectively；When frequency domain distance is less than preset value, same stepping on carrier wave or carrier set
Row LBT operates.
In enforcement, LBT operation module can also be further used for carrying out respectively on carrier wave or carrier set
During LBT operation, different carrier waves or carrier set are carried out respectively for upstream or downstream transmission
LBT operates.
In enforcement, LBT operation module can also be further used for being located at respectively not in carrier wave or carrier set
With frequency range, when LBT operation is carried out respectively on carrier wave or carrier set, carrier wave on different frequency bands
Or the LBT operation for upstream or downstream transmission is carried out respectively on carrier set；In carrier wave or carrier wave
Set is located at same frequency range, when carrying out LBT operation on carrier wave or carrier set respectively, by intercarrier
Distance carries out the LBT behaviour for upstream or downstream transmission respectively more than the carrier wave of preset value or carrier set
Make.
In enforcement, LBT operation module can also be further used for being located at different frequency ranges respectively in carrier set
When, in carrier set on different frequency bands, the synchronous LBT carrying out respectively for upstream or downstream transmission
Operation；When carrier set is located at same frequency range, in carrier set, synchronous carry out respectively for up or
The LBT operation of downlink transfer.
In enforcement, LBT operation module can also be further used on carrier wave or carrier set synchronous carrying out
During LBT operation：
Determine main carrier and from carrier wave in each carrier wave；
A kind of detection of access way is carried out on main carrier, another kind of access way is being carried out on carrier wave
Detection；
According to the testing result on main carrier, when main carrier accesses channel, if the detection knot from carrier wave
Fruit is the spare time, accesses channel in main carrier with from carrier wave, if the testing result from carrier wave is busy, abandons
Main carrier and access channel from carrier wave；
Or,
Determine main carrier set and from carrier set in each carrier set；
A kind of detection of access way is carried out on main carrier set, connects another kind is carried out on carrier set
Enter the detection of mode；
The testing result closed according to main carrier collection, when main carrier collection closes access channel, if from carrier set
The testing result closed is the spare time, accesses channel in main carrier set with from carrier set, if from carrier set
On testing result be busy, abandon main carrier set with from carrier set access channel.
In enforcement, LBT operation module can also be further used for carrying out on main carrier or main carrier set
ECCA；And/or, from carrier wave or ICCA is carried out from carrier set.
In enforcement, LBT operation module can also be further used for true by one of following manner or a combination thereof
Determine main carrier or main carrier set：
Main carrier or main carrier set, the system according to channel busy degree are determined according to the busy idle information of feedback channel
Meter information determines main carrier or main carrier set, determines main carrier or main carrier according to channel real-time detection information
Set, random selection main carrier or main carrier set.
For convenience of description, each several part of apparatus described above is divided into various modules or unit respectively with function
Description.Certainly, can be the function of each module or unit in same or multiple softwares when implementing the present invention
Or realize in hardware.
When implementing technical scheme provided in an embodiment of the present invention, can implement as follows.
Fig. 6 is communication apparatus construction schematic diagram, as illustrated, can include in communication equipment：
Processor 600, for reading the program in memorizer 620, executes following process：
Determine between carrier wave and carrier wave, or the frequency domain distance between carrier set and carrier set；
Transceiver 610, for sending data under the control of processor 600, executes following process：
When frequency domain distance is more than preset value, LBT operation is carried out on carrier wave or carrier set respectively；
When frequency domain distance is less than preset value, synchronization on carrier wave or carrier set carries out LBT operation.
In enforcement, LBT operation is carried out on carrier wave or carrier set respectively, including：In different carrier waves
Or the LBT operation for upstream or downstream transmission is carried out respectively on carrier set.
In enforcement, when carrier wave or carrier set are located at different frequency ranges respectively, described in carrier wave or carrier wave
Collection closes and carries out LBT operation respectively, including：On carrier wave on different frequency bands or carrier set respectively
Carry out the LBT operation for upstream or downstream transmission；
When carrier wave or carrier set are located at same frequency range, described carry out respectively on carrier wave or carrier set
LBT operates, including：The distance of intercarrier is more than the carrier wave of preset value or carrier set is used respectively
LBT operation in upstream or downstream transmission.
In enforcement, further include：
When carrier set is located at different frequency ranges respectively, in carrier set on different frequency bands, synchronous point
Do not carry out the LBT operation for upstream or downstream transmission；
When carrier set is located at same frequency range, in carrier set, synchronous carry out respectively for up or under
The LBT operation of row transmission.
In enforcement, described synchronous on carrier wave or carrier set carry out LBT operation, including：
Determine main carrier and from carrier wave in each carrier wave；
A kind of detection of access way is carried out on main carrier, another kind of access way is being carried out on carrier wave
Detection；
According to the testing result on main carrier, when main carrier accesses channel, if the detection knot from carrier wave
Fruit is the spare time, accesses channel in main carrier with from carrier wave, if the testing result from carrier wave is busy, abandons
Main carrier and access channel from carrier wave；
Or,
Determine main carrier set and from carrier set in each carrier set；
A kind of detection of access way is carried out on main carrier set, connects another kind is carried out on carrier set
Enter the detection of mode；
The testing result closed according to main carrier collection, when main carrier collection closes access channel, if from carrier set
The testing result closed is the spare time, accesses channel in main carrier set with from carrier set, if from carrier set
On testing result be busy, abandon main carrier set with from carrier set access channel.
In enforcement, carry out on main carrier or main carrier set is detected as extension clear channel assessment (CCA) ECCA；
And/or, from carrier wave or carry out from carrier set be detected as initial idle channel estimating ICCA.
In enforcement, main carrier or main carrier set are determined by one of following manner or a combination thereof：
Main carrier or main carrier set, the system according to channel busy degree are determined according to the busy idle information of feedback channel
Meter information determines main carrier or main carrier set, determines main carrier or main carrier according to channel real-time detection information
Set, random selection main carrier or main carrier set.
Wherein, in figure 6, bus architecture can include bus and the bridge of any number of interconnection, specifically by
One or more processors and the various electrical chains of the memorizer of memorizer 620 representative that processor 600 represents
It is connected together.Bus architecture can also be by such as ancillary equipment, manostat and management circuit or the like
Various other circuit link together, and these are all it is known in the art, therefore, no longer it are entered herein
Row further describes.EBI provides interface.Transceiver 610 can be multiple element, that is, include sending
Machine and transceiver, provide the unit for communicating over a transmission medium with various other devices.Processor 600
It is responsible for bus architecture and common process, memorizer 620 can store processor 600 and execute operation
When the data that used.
In sum, in technical scheme provided in an embodiment of the present invention, for LTE-U in unauthorized frequency range
When carrying out LBT, when revealing therefore adjacent carrier wave needed to synchronize LBT due to there is RF,
Propose a kind of scheme of multicarrier LBT, for the synchronous LBT of adjacent carrier execution in same band,
And apart from the remote carrier set as being belonging respectively to two band, LBT is independently carried out for frequency domain.
With the continuous growth of mobile data services amount, frequency spectrum resource is more and more nervous, only using mandate frequency spectrum
Resource carries out network design and business transmission may can not meet traffic needs, and therefore LTE system can
To consider deployment transmission in unlicensed spectrum resource, to improve Consumer's Experience and to spread over.But at present
How LTE system works in unlicensed spectrum resource does not also have clear and definite method.And the embodiment of the present invention carries
For technical scheme just giving the side that a kind of LTE system multiple carrier waves in unlicensed spectrum carry out LBT
Case.This programme can be effectively ensured the simple mode of multiple carrier waves and can achieve polymerization so that different band
Interior carrier wave independently can carry out LBT, be respectively used to DL and UL and transmit.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can be using complete hardware embodiment, complete software embodiment or knot
Close the form of the embodiment of software and hardware aspect.And, the present invention can adopt and wherein wrap one or more
Computer-usable storage medium containing computer usable program code (including but not limited to disk memory and
Optical memory etc.) the upper computer program implemented form.
The present invention is to produce with reference to method according to embodiments of the present invention, equipment (system) and computer program
The flow chart of product and/or block diagram are describing.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or the flow process in square frame and flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embed
The processor of formula datatron or other programmable data processing device is to produce a machine so that passing through to calculate
The instruction of the computing device of machine or other programmable data processing device produces for realizing in flow chart one
The device of the function of specifying in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or other programmable datas can be guided to process and set
So that being stored in this computer-readable memory in the standby computer-readable memory working in a specific way
Instruction produce and include the manufacture of command device, the realization of this command device is in one flow process or multiple of flow chart
The function of specifying in flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, makes
Obtain and series of operation steps is executed on computer or other programmable devices to produce computer implemented place
Reason, thus the instruction of execution is provided for realizing in flow chart one on computer or other programmable devices
The step of the function of specifying in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
Obviously, those skilled in the art can carry out various changes and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these modification and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these changes and modification.
Claims (14)
1. one kind is first listened and is being said LBT method it is characterised in that including：
Determine between carrier wave and carrier wave, or the frequency domain distance between carrier set and carrier set；
When frequency domain distance is more than preset value, LBT operation is carried out on carrier wave or carrier set respectively；
When frequency domain distance is less than preset value, synchronization on carrier wave or carrier set carries out LBT operation.
2. the method for claim 1 is it is characterised in that enter respectively on carrier wave or carrier set
Row LBT operates, including：Different carrier waves or carrier set are carried out respectively for upstream or downstream
The LBT operation of transmission.
3. method as claimed in claim 2 it is characterised in that
When carrier wave or carrier set are located at different frequency ranges respectively, described on carrier wave or carrier set
Carry out LBT operation respectively, including：Used respectively on carrier wave on different frequency bands or carrier set
LBT operation in upstream or downstream transmission；
When carrier wave or carrier set are located at same frequency range, described enter respectively on carrier wave or carrier set
Row LBT operates, including：The distance of intercarrier is more than the carrier wave of preset value or carrier set is entered respectively
Row is for the LBT operation of upstream or downstream transmission.
4. method as claimed in claim 3 is it is characterised in that further include：
When carrier set is located at different frequency ranges respectively, in carrier set on different frequency bands, synchronous point
Do not carry out the LBT operation for upstream or downstream transmission；
When carrier set is located at same frequency range, in carrier set, synchronous carry out respectively for up or under
The LBT operation of row transmission.
5. described method as arbitrary in Claims 1-4 it is characterised in that described in carrier wave or carrier wave
Collect synchronization of closing and carry out LBT operation, including：
Determine main carrier and from carrier wave in each carrier wave；
A kind of detection of access way is carried out on main carrier, another kind of access way is being carried out on carrier wave
Detection；
According to the testing result on main carrier, when main carrier accesses channel, if the detection knot from carrier wave
Fruit is the spare time, accesses channel in main carrier with from carrier wave, if the testing result from carrier wave is busy, abandons
Main carrier and access channel from carrier wave；
Or,
Determine main carrier set and from carrier set in each carrier set；
A kind of detection of access way is carried out on main carrier set, connects another kind is carried out on carrier set
Enter the detection of mode；
The testing result closed according to main carrier collection, when main carrier collection closes access channel, if from carrier set
The testing result closed is the spare time, accesses channel in main carrier set with from carrier set, if from carrier set
On testing result be busy, abandon main carrier set with from carrier set access channel.
6. method as claimed in claim 5 is it is characterised in that enterprising in main carrier or main carrier set
That goes is detected as extension clear channel assessment (CCA) ECCA；And/or, carry out from carrier wave or from carrier set
It is detected as initial idle channel estimating ICCA.
7. method as claimed in claim 5 is it is characterised in that pass through one of following manner or its group
Close and determine main carrier or main carrier set：
Main carrier or main carrier set, the system according to channel busy degree are determined according to the busy idle information of feedback channel
Meter information determines main carrier or main carrier set, determines main carrier or main carrier according to channel real-time detection information
Set, random selection main carrier or main carrier set.
8. a kind of LBT device is it is characterised in that include：
Frequency domain apart from determining module, for determining between carrier wave and carrier wave, or carrier set and carrier set it
Between frequency domain distance；
LBT operation module, for when frequency domain distance is more than preset value, distinguishing on carrier wave or carrier set
Carry out LBT operation；When frequency domain distance is less than preset value, synchronization on carrier wave or carrier set carries out LBT
Operation.
9. device as claimed in claim 8 is it is characterised in that LBT operation module is further used for
When LBT operation is carried out respectively on carrier wave or carrier set, on different carrier waves or carrier set respectively
Carry out the LBT operation for upstream or downstream transmission.
10. device as claimed in claim 9 is it is characterised in that LBT operation module is further used for
Carrier wave or carrier set are located at different frequency ranges respectively, carry out LBT on carrier wave or carrier set respectively
During operation, carrier wave on different frequency bands or carrier set are carried out respectively for upstream or downstream transmission
LBT operates；It is located at same frequency range in carrier wave or carrier set, carrier wave or carrier set are carried out respectively
During LBT operation, the distance of intercarrier is more than the carrier wave of preset value or carrier set carry out respectively for
The LBT operation of row or downlink transfer.
11. devices as claimed in claim 10 are it is characterised in that LBT operation module is further used for
When carrier set is located at different frequency ranges respectively, in carrier set on different frequency bands, synchronization is entered respectively
Row is for the LBT operation of upstream or downstream transmission；When carrier set is located at same frequency range, in carrier set
Close, the synchronous LBT operation carrying out respectively for upstream or downstream transmission.
12. such as claim 8 to 11 arbitrary described devices are it is characterised in that LBT operation module is entered
When one step carries out LBT operation for synchronization on carrier wave or carrier set：
Determine main carrier and from carrier wave in each carrier wave；
A kind of detection of access way is carried out on main carrier, another kind of access way is being carried out on carrier wave
Detection；
According to the testing result on main carrier, when main carrier accesses channel, if the detection knot from carrier wave
Fruit is the spare time, accesses channel in main carrier with from carrier wave, if the testing result from carrier wave is busy, abandons
Main carrier and access channel from carrier wave；
Or,
Determine main carrier set and from carrier set in each carrier set；
A kind of detection of access way is carried out on main carrier set, connects another kind is carried out on carrier set
Enter the detection of mode；
The testing result closed according to main carrier collection, when main carrier collection closes access channel, if from carrier set
The testing result closed is the spare time, accesses channel in main carrier set with from carrier set, if from carrier set
On testing result be busy, abandon main carrier set with from carrier set access channel.
13. devices as claimed in claim 12 are it is characterised in that LBT operation module is further used for
Main carrier or main carrier set carry out ECCA；And/or, carrying out from carrier wave or from carrier set
ICCA.
14. devices as claimed in claim 12 are it is characterised in that LBT operation module is further used for
Main carrier or main carrier set are determined by one of following manner or a combination thereof：
Main carrier or main carrier set, the system according to channel busy degree are determined according to the busy idle information of feedback channel
Meter information determines main carrier or main carrier set, determines main carrier or main carrier according to channel real-time detection information
Set, random selection main carrier or main carrier set.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510483745.2A CN106455108B (en) | 2015-08-07 | 2015-08-07 | listen-before-talk method and device |
| PCT/CN2016/089827 WO2017024915A1 (en) | 2015-08-07 | 2016-07-12 | Listen-before-talk method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510483745.2A CN106455108B (en) | 2015-08-07 | 2015-08-07 | listen-before-talk method and device |
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| CN106455108B CN106455108B (en) | 2019-12-13 |
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| CN201510483745.2A Active CN106455108B (en) | 2015-08-07 | 2015-08-07 | listen-before-talk method and device |
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| WO (1) | WO2017024915A1 (en) |
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| CN110034830A (en) * | 2018-01-12 | 2019-07-19 | 普天信息技术有限公司 | A kind of multi-subband collaborative detection method, device, base station and terminal device |
| CN112770400A (en) * | 2019-11-01 | 2021-05-07 | 中国移动通信有限公司研究院 | Method and device for scheduling unauthorized frequency band, base station and network side equipment |
| WO2021179193A1 (en) * | 2020-03-11 | 2021-09-16 | Qualcomm Incorporated | Contention-based access for uplink transmission with carrier aggregation |
Families Citing this family (1)
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| CN114258150B (en) * | 2020-09-25 | 2023-11-24 | 维沃移动通信有限公司 | Channel access selection method, device, communication equipment and readable storage medium |
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| CN110034830A (en) * | 2018-01-12 | 2019-07-19 | 普天信息技术有限公司 | A kind of multi-subband collaborative detection method, device, base station and terminal device |
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| CN112770400A (en) * | 2019-11-01 | 2021-05-07 | 中国移动通信有限公司研究院 | Method and device for scheduling unauthorized frequency band, base station and network side equipment |
| CN112770400B (en) * | 2019-11-01 | 2023-08-15 | 中国移动通信有限公司研究院 | Unlicensed frequency band scheduling method and device, base station and network equipment |
| WO2021179193A1 (en) * | 2020-03-11 | 2021-09-16 | Qualcomm Incorporated | Contention-based access for uplink transmission with carrier aggregation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106455108B (en) | 2019-12-13 |
| WO2017024915A1 (en) | 2017-02-16 |
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210528 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |