CN106211350B - A kind of unauthorized frequency range cut-in method based on receiving side carrier sense - Google Patents
A kind of unauthorized frequency range cut-in method based on receiving side carrier sense Download PDFInfo
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- CN106211350B CN106211350B CN201610490522.3A CN201610490522A CN106211350B CN 106211350 B CN106211350 B CN 106211350B CN 201610490522 A CN201610490522 A CN 201610490522A CN 106211350 B CN106211350 B CN 106211350B
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- 238000012546 transfer Methods 0.000 claims abstract description 6
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- 238000013461 design Methods 0.000 claims description 2
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Classifications
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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]
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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
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention provides a kind of unauthorized frequency range cut-in method based on receiving side carrier sense, using the carrier sense mechanism based on receiving end, the base station FDD LTE-U is before unauthorized frequency range carries out downlink transfer, by receiving end, that is terminal, rather than base station carries out the carrier sense of channel.When receiving end determination, which can access unauthorized frequency range, to be transmitted, terminal can feed back to base station one by authorized spectrum band immediately can be with the information of busy channel, after the base station FDD LTE-U receives the signal, the transmission that unauthorized frequency range carries out downlink can be occupied immediately.The problem of carrier sense can be to avoid " exposed terminal " and " concealed terminal " is carried out by terminal, so that the parallel transmission chance in LTE-U base station network obtains abundant and appropriate use, has the characteristics that increase LTE-U network capacity.
Description
Technical field
The invention belongs to mobile communication fields, are related to the unlicensed spectrum radio access technology more particularly to one of LTE network
The method of kind of the base station the LTE-U distributed random frequency spectrum access mechanism competition-based in unauthorized frequency range.
Background technique
LTE-U technology refers to the frequency spectrum polymerizeing in authorized spectrum band and unauthorized frequency range by carrier aggregation technology, and LTE is made to exist
It cooperates in authorized spectrum band and unauthorized frequency range, provides the technology of service jointly for user.Due to can be used for unauthorized frequency range
Feature again free when bandwidth Datong District, the capacity boost for the realization LTE network that LTE-U can be inexpensive, therefore, it has become industries
The hot spot of concern.However, in order to realize and work in the unauthorized other technologies by frequency range, the especially harmony of WiFi technology
It coexists, LTE-U technology usually can all introduce the mechanism of carrier sense, i.e. LTE-U carries out data transmission it in unlicensed spectrum
Preceding first to carry out carrier sense, when the carrier wave free time, i.e., when transmitting data without other node busy channels, LTE-U node can be with
The transmission of busy channel progress data；When channel is occupied, then LTE-U can postpone the biography of oneself by fallback mechanism
It is defeated.In 3 gpp, the downlink LTE-U technology based on unauthorized frequency range, i.e. Licensed Assisted Access (LAA)
Completed to have standardized, it use the carrier sense/collision avoidance mechanism similar with IEEE 802.11, may be implemented with
The harmonious coexistence of WiFi.
The middle regulation of 3GPP standard, the base station LTE-U will be responsible for carrying out carrier sense before downlink transfer.However, Radio Link
On traditional carrier sense mechanism based on transmitting terminal, it will usually the problem of causing " exposed terminal " and " concealed terminal ".It is " sudden and violent
Dew terminal " refers to that sending node A and B within the signal cover of other side, can listen to the transmission of other side mutually each other,
Therefore, when A busy channel is transmitting data, it is occupied without carrying out data transmission that B judges channel, still, B in fact
Receiving node b may not will receive the interference of A, therefore script B can transmit number simultaneously other than the signal cover of A
According to b." exposed terminal " problem is the waste to parallel transmission chance." concealed terminal " refer to a node B another just
Other than the coverage area of the sending node A of transmission, therefore, which will be considered that channel idle and sends data to its receiving node.
But the corresponding receiving node b of B, just within the signal cover of A, therefore, b can cause because receiving the strong interference of A
It can not normal transmission." concealed terminal " is the abuse to parallel transmission.Exposed terminal and hidden terminal problem can be logical to operator
It crosses LTE-U progress dilatation and causes biggish negative effect.
Summary of the invention
The present invention is directed in Frequency Division Duplex (FDD) LTE-U base station network, i.e. the base station LTE-U
Duplex mode in authorized spectrum band is FDD, to solve the network " hiding end present in the downlink transfer of unauthorized frequency range
End " and " exposed terminal " problem by designing a kind of carrier sense mechanism based on receiving end make each section in network for target
Parallel transmission chance between point obtains appropriately and adequately using, to promote the capacity of network.
To solve the above problems, the present invention adopts the following technical scheme that:
A kind of unauthorized frequency range cut-in method based on receiving side carrier sense in LTE-U network the following steps are included:
Step 1, the base station FDD LTE-U have data to terminal carry out downlink transfer, then base station first pass through authorized spectrum band to
The terminal transmits " carrier sense instruction " information；
After step 2, terminal receive " carrier sense instruction " information, carrier sense is carried out to unauthorized frequency range, if letter
Road does not have occupied, is transferred to step 7；Otherwise, it is transferred to step 3；
If the base station that step 3, unauthorized frequency range are only accessed by terminal oneself occupies, it is transferred to step 4；If terminal is sentenced
Unauthorized frequency range of breaking is occupied by adjacent base station, then is transferred to step 6；
Step 4, terminal transmit " sharing request " information to the base station FDD LTE-U by authorized spectrum band uplink；
After step 5, base station receive " sharing request " information, the dispatch channel resource of unauthorized frequency range is given to transmission " channel
Free time " and multiple terminals of " sharing request " are transferred to step 9 to carry out the parallel transmission of downlink；
Step 6 executes fallback mechanism, i.e. terminal judges that unauthorized frequency range is that the base station oneself accessed occupies, then is transferred to
Step 4；Otherwise, terminal executes always fallback mechanism, and until fallback mechanism terminates, terminal judgement can be transferred to step with busy channel
Rapid 7；
Step 7, terminal transmit " channel idle " information to base station by authorized spectrum band uplink；
Step 8, after receiving " channel idle " information, the base station FDD LTE-U occupies unauthorized frequency range and gives terminal transmission number
According to；
The downlink transmission of step 9, terminal in unauthorized frequency range persistently carries out, and until data end of transmission or reaches
To the maximum duration limitation for occupying unauthorized frequency range.
Preferably, in step 4, " sharing request " information is when terminal judges that unauthorized frequency range is accessed by oneself
Base station occupy, and when being that another or multiple terminals carry out data transmission using unauthorized frequency range, terminal request base station
Unauthorized frequency range is subjected to shared demand signalling between the terminals.
Preferably, in steps of 5, if base station receives " sharing request " information, it is unauthorized that base station one is scheduled on occupancy
When frequency range carries out downlink transmission, while base station can assert that the terminal of transmission " sharing request " does not have in unauthorized frequency range
There is the interference for receiving other adjacent base stations.
Preferably, in step 6, the design parameter setting of fallback mechanism is awarded according in 3GPP TS 36.213 about non-
Weigh frequent section carrier sense/collision avoid specified in fallback mechanism carry out.
Preferably, in step 9, the downlink between the base station FDD LTE-U and a certain terminal occupies non-award
The maximum duration limitation for weighing frequency range is determined with reference to parameter corresponding in 3GPP TS 36.213.
The present invention uses the carrier sense mechanism based on incoming end, in the base station FDD LTE-U in the case where unauthorized frequency range carries out
Before row transmission, by receiving end, i.e. terminal, rather than base station carries out the carrier sense of channel.When receiving end determination can access it is non-
When authorized spectrum band is transmitted, terminal can immediately by authorized spectrum band feed back to base station one can with the information of busy channel,
After the base station LTE-U receives the signal, the transmission that unauthorized frequency range carries out downlink can be occupied immediately.Carrier wave is carried out by terminal
Can be to avoid " exposed terminal " and " concealed terminal " the problem of is listened to, so that the parallel transmission chance in LTE-U base station network obtains
To abundant and appropriate use, there is the advantage for increasing LTE-U network capacity.
Detailed description of the invention
Fig. 1 is the unauthorized frequency range cut-in method based on receiving side carrier sense in a kind of LTE-U network of the present invention
Flow diagram.
Specific embodiment
In order to make those skilled in the art better understand the present invention program, below in conjunction with attached in present example
The embodiment of the present invention program is described in detail in figure.
The unauthorized frequency range cut-in method based on receiving side carrier sense in a kind of LTE-U network of the present invention, uses
The mechanism that carrier sense is carried out based on receiving end has been achieved the purpose that solve " exposed terminal " and " concealed terminal ", has had and increase
The advantage of LTE-U network capacity.
A kind of unauthorized frequency range cut-in method based on receiving side carrier sense in LTE-U network, comprising the following steps:
The base station step 1:FDD LTE-U has data to carry out downlink transfer to terminal, due between the base station LTE-U and terminal
There is reliable communication link in authorized spectrum band, base station first passes through authorized spectrum band to terminal transmitting " carrier sense instruction " letter
Breath.
Step 2: after terminal receives " carrier sense instruction " information, carrier sense being carried out to unauthorized frequency range immediately.Such as
It is occupied that fruit finds that channel does not have, then terminal thinks channel idle, is transferred to step 7；Otherwise, it is transferred to step 3.
Step 3: if unauthorized frequency range only by terminal oneself access base station occupy, terminal think can in this base station
Other terminals share unauthorized frequency range, then are transferred to step 4；If terminal judges that unauthorized frequency range is occupied by adjacent base station,
It is transferred to step 6.
Step 4: terminal transmits " sharing request " information to the base station FDD LTE-U by authorized spectrum band uplink,
To notify base station oneself for interference by adjacent base station, and can in this base station other occupied unauthorized frequency range
Downlink shares unauthorized frequency range.
" sharing request " information is to work as the base station that terminal judges that unauthorized frequency range is accessed oneself to occupy, and utilizing
When unauthorized frequency range is that another or multiple terminals carry out data transmission, terminal request base station is by unauthorized frequency range at these ends
Shared demand signalling is carried out between end.
Step 5: after base station receives " sharing request " information, giving the dispatch channel resource of unauthorized frequency range to transmission " channel
Free time " and multiple terminals of " sharing request " are transferred to step 9 to carry out the parallel transmission of downlink.
If base station receives " sharing request " information, base station one, which is scheduled on, occupies unauthorized frequency range progress down link data
When transmission, meanwhile, base station can assert that the terminal of transmission " sharing request " does not receive other adjacent base stations in unauthorized frequency range
Interference, therefore, the frequency spectrum resource in unauthorized frequency range can be scheduled to the terminal by base station, realize this terminal with before
The parallel transmission of the downlink of one or more terminals in this base station through occupying unauthorized frequency range.
Step 6: since unauthorized frequency range is occupied by adjacent base station, terminal needs to be implemented fallback mechanism.The tool of fallback mechanism
Body parameter setting according in 3GPP TS 36.213 about unauthorized frequent section carrier sense/collision avoid specified in retract machine
System carries out.In back off procedure, terminal judges in unauthorized frequency range, and channel is again by oneself while the end of transmission of adjacent base station
The base station of access occupies, if it is, being transferred to step 4；Otherwise, terminal executes always fallback mechanism and can occupy to terminal judgement
Channel is transferred to step 7.
Step 7: terminal transmits " channel idle " information to base station by authorized spectrum band uplink, and notice base station can
Oneself transmitting data is thought to occupy unauthorized frequency range.
Step 8: after receiving " channel idle " information, the base station FDD LTE-U occupies unauthorized frequency range and gives terminal transmission number
According to.
Step 9: downlink transmission of the terminal in unauthorized frequency range persistently carries out, and until data end of transmission or reaches
To the maximum duration limitation for occupying unauthorized frequency range.Downlink between the base station FDD LTE-U and a certain terminal occupies
The corresponding parameter of maximum duration that the maximum duration of unauthorized frequency range can refer to busy channel in 3GPP TS36.213 determines.
The advantages of unauthorized frequency range cut-in method based on receiving side carrier sense in LTE-U network of the invention, exists
In: the base station FDD LTE-U is before unauthorized frequency range carries out downlink transmission, and by receiving end rather than transmitting terminal carries out carrier wave
It listens to, it can be to avoid " exposed terminal " and " concealed terminal " problem, to realize the base station FDD LTE-U in unauthorized frequency range simultaneously
It row transmission opportunity appropriate and makes full use of, to promote the capacity of LTE-U network.
Above embodiments are only the exemplary embodiment invented, and are not used in limitation invention, protection scope of the present invention is by weighing
Sharp claim limits.Those skilled in the art can make various repair to the present invention within the spirit and scope of the present invention
Change or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (5)
1. a kind of unauthorized frequency range cut-in method based on receiving side carrier sense, which comprises the following steps:
Step 1, the base station FDD LTE-U have data to carry out downlink transfer to terminal, then base station first passes through authorized spectrum band to the end
End transmitting " carrier sense instruction " information；
After step 2, terminal receive " carrier sense instruction " information, carrier sense is carried out to unauthorized frequency range, if channel does not have
Have occupied, is transferred to step 7；Otherwise, it is transferred to step 3；
If the base station that step 3, unauthorized frequency range are only accessed by terminal oneself occupies, it is transferred to step 4；If terminal judges non-
Authorized spectrum band is occupied by adjacent base station, then is transferred to step 6；
Step 4, terminal transmit " sharing request " information to the base station FDD LTE-U by authorized spectrum band uplink；
After step 5, base station receive " sharing request " information, by the dispatch channel resource of unauthorized frequency range to transmission " channel idle "
Multiple terminals of " sharing request " are transferred to step 9 to carry out the parallel transmission of downlink；
Step 6 executes fallback mechanism, i.e. terminal judges that unauthorized frequency range is that the base station oneself accessed occupies, then is transferred to step
4；Otherwise, terminal executes always fallback mechanism, and until fallback mechanism terminates, terminal judgement can be transferred to step 7 with busy channel；
Step 7, terminal transmit " channel idle " information to base station by authorized spectrum band uplink；
Step 8, after receiving " channel idle " information, the base station FDD LTE-U occupies unauthorized frequency range to terminal transmission data；
The downlink transmission of step 9, terminal in unauthorized frequency range persistently carries out, until data end of transmission or reach accounts for
It is limited with the maximum duration of unauthorized frequency range.
2. the unauthorized frequency range cut-in method based on receiving side carrier sense as described in claim 1, which is characterized in that in step
In rapid 4, " sharing request " information be when terminal judges that the base station that unauthorized frequency range oneself access occupies, and it is non-in utilization
When authorized spectrum band is that another or multiple terminals carry out data transmission, terminal request base station is by unauthorized frequency range in these terminals
Between carry out shared demand signalling.
3. the unauthorized frequency range cut-in method based on receiving side carrier sense as described in claim 1, which is characterized in that in step
In rapid 5, if base station receives " sharing request " information, base station one, which is scheduled on, occupies unauthorized frequency range progress down link data biography
When defeated, while base station can assert that the terminal of transmission " sharing request " does not receive the dry of other adjacent base stations in unauthorized frequency range
It disturbs.
4. the unauthorized frequency range cut-in method based on receiving side carrier sense as described in claim 1, which is characterized in that in step
In rapid 6, the setting of the design parameter of fallback mechanism according in 3GPP TS 36.213 about unauthorized frequent section carrier sense/collision
Fallback mechanism specified in avoiding carries out.
5. the unauthorized frequency range cut-in method based on receiving side carrier sense as described in claim 1, which is characterized in that in step
In rapid 9, downlink between the base station FDD LTE-U and a certain terminal occupies the maximum duration limitation of unauthorized frequency range
It is determined with reference to parameter corresponding in 3GPP TS 36.213.
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| CN201610490522.3A CN106211350B (en) | 2016-06-28 | 2016-06-28 | A kind of unauthorized frequency range cut-in method based on receiving side carrier sense |
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| CN201610490522.3A CN106211350B (en) | 2016-06-28 | 2016-06-28 | A kind of unauthorized frequency range cut-in method based on receiving side carrier sense |
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| JP2020057824A (en) * | 2017-02-01 | 2020-04-09 | シャープ株式会社 | Base station device, terminal device, and communication method |
| CN108419266B (en) * | 2017-02-10 | 2020-12-25 | 华为技术有限公司 | Channel interception method and transmitting terminal equipment |
| CN113727458A (en) * | 2017-05-26 | 2021-11-30 | 华为技术有限公司 | Data sending method and communication equipment |
| WO2020093330A1 (en) * | 2018-11-08 | 2020-05-14 | 华为技术有限公司 | Spectrum resource determination method, apparatus, and system |
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| US7408907B2 (en) * | 2002-09-11 | 2008-08-05 | Cisco Technology, Inc. | System and method for management of a shared frequency band using client-specific management techniques |
| CN105208668B (en) * | 2014-06-06 | 2019-06-18 | 上海诺基亚贝尔股份有限公司 | A kind of carrier sensing method |
| CN105592464B (en) * | 2014-10-20 | 2021-06-15 | 索尼公司 | Apparatus and method for base station side and user side of wireless communication |
| CN104507108B (en) * | 2014-12-19 | 2019-03-08 | 宇龙计算机通信科技(深圳)有限公司 | The instruction of channel clear or method for obligating resource, system, terminal and base station |
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