CN106211350A - A kind of based on the unauthorized frequency range cut-in method receiving side carrier sense - Google Patents
A kind of based on the unauthorized frequency range cut-in method receiving side carrier sense Download PDFInfo
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- CN106211350A CN106211350A CN201610490522.3A CN201610490522A CN106211350A CN 106211350 A CN106211350 A CN 106211350A CN 201610490522 A CN201610490522 A CN 201610490522A CN 106211350 A CN106211350 A CN 106211350A
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- China
- Prior art keywords
- frequency range
- terminal
- base station
- unauthorized frequency
- carrier sense
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance
-
- 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
-
- 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
Abstract
The present invention provides a kind of based on the unauthorized frequency range cut-in method receiving side carrier sense, using carrier sense mechanism based on receiving terminal, FDD LTE U base station is before unauthorized frequency range carries out downlink transfer, by receiving terminal, i.e. terminal, rather than base station carries out the carrier sense of channel.When receiving terminal determines that can access unauthorized frequency range is transmitted, terminal can feed back to one, base station by mandate frequency range immediately can be with the information of busy channel, after FDD LTE U base station receives this signal, unauthorized frequency range can be taken immediately and carry out the transmission of downlink.Carried out carrier sense by terminal and can avoid " exposed terminal " and the problem of " concealed terminal " so that the parallel transmission chance in LTE U base station network obtains abundant and appropriate use, have the advantages that to increase LTE U network capacity.
Description
Technical field
The invention belongs to moving communicating field, relate to the unlicensed spectrum radio access technology of LTE network, particularly relate to one
Plant LTE-U base station method of distributed random frequency spectrum access mechanism based on competition in unauthorized frequency range.
Background technology
LTE-U technology refers to authorize the frequency spectrum in frequency range and unauthorized frequency range by carrier aggregation technology polymerization, makes LTE exist
Authorize collaborative work in frequency range and unauthorized frequency range, jointly provide the user the technology of service.Due to can use of unauthorized frequency range
Feature the most free during bandwidth Datong District, therefore LTE-U can become industry with the capacity boost realizing LTE network of low cost
The focus paid close attention to.But, in order to realize and be operated in the unauthorized harmony by the other technologies in frequency range, particularly WiFi technology
Coexisting, LTE-U technology the most all can introduce the mechanism of carrier sense, i.e. LTE-U carries out data transmission it in unlicensed spectrum
Front carrier sense to be carried out, when carrier wave is idle, when i.e. not having other node busy channels transmission data, LTE-U node is permissible
Busy channel carries out the transmission of data；When channel is the most occupied, then LTE-U can postpone the biography of oneself by fallback mechanism
Defeated.In 3 gpp, downlink LTE-U technology based on unauthorized frequency range, i.e. Licensed Assisted Access (LAA)
Being complete and have standardized, it have employed the carrier sense/collision avoidance mechanism similar with IEEE 802.11, it is possible to achieve with
The harmonious coexistence of WiFi.
The middle regulation of 3GPP standard, before downlink transfer, LTE-U base station to be responsible for carrying out carrier sense.But, wireless link
On traditional carrier sense mechanism based on transmitting terminal, it will usually cause " exposed terminal " and the problem of " concealed terminal "." sudden and violent
Dew terminal " refer to that sending node A Yu B, mutually within the signal cover of the other side, can listen to the transmission of the other side each other,
Therefore, when A busy channel transmits data, B can judge that channel is occupied without carrying out data transmission, but, B in fact
Receiving node b will not may be disturbed by A beyond the signal cover of A, therefore originally B can transmit number simultaneously
According to b." exposed terminal " problem is the waste to parallel transmission chance." concealed terminal " at another is just referring to a node B
Beyond the coverage of the sending node A of transmission, therefore, this B will be considered that channel idle sends data to its receiving node.
But receiving node b corresponding for B is just within the signal cover of A, therefore, b can cause because receiving the strong interference of A
Cannot normal transmission." concealed terminal " is the abuse to parallel transmission.Operator can be led to by exposed terminal and hidden terminal problem
Cross LTE-U to carry out dilatation and cause bigger negative effect.
Summary of the invention
Present invention is directed in Frequency Division Duplex (FDD) LTE-U base station network, i.e. LTE-U base station
It is FDD authorizing the duplex mode in frequency range, " hides eventually present in the downlink transfer of unauthorized frequency range solving this network
End " and " exposed terminal " problem be target, by designing a kind of carrier sense mechanism based on receiving terminal, make in network each save
Parallel transmission chance between point obtains appropriately and sufficiently using, thus promotes the capacity of network.
For solving the problems referred to above, the present invention adopts the following technical scheme that:
Comprising the following steps based on the unauthorized frequency range cut-in method receiving side carrier sense in a kind of LTE-U network:
Step 1, FDD LTE-U base station have data to carry out downlink transfer to terminal, then base station first pass through mandate frequency range to
This terminal transmission " carrier sense instruction " information；
After step 2, terminal receive " carrier sense instruction " information, unauthorized frequency range is carried out carrier sense, if letter
Road does not has occupied, proceeds to step 7；Otherwise, step 3 is proceeded to；
If the base station that the unauthorized frequency range of step 3 is only accessed by terminal oneself takies, then proceed to step 4；If terminal is sentenced
Disconnected unauthorized frequency range is taken by adjacent base station, then proceed to step 6；
Step 4, terminal transmit " sharing a request " information by authorizing frequency range up-link to FDD LTE-U base station；
After step 5, base station receive " sharing request " information, the dispatch channel resource of unauthorized frequency range is given and sends " channel
Idle " with multiple terminals of " sharing request ", thus carry out the parallel transmission of downlink, proceed to step 9；
The base station that step 6, the execution unauthorized frequency range of fallback mechanism, i.e. terminal judges are accessed by oneself takies, then proceed to
Step 4；Otherwise, terminal performs fallback mechanism always, until fallback mechanism terminates, terminal judges can proceed to step with busy channel
Rapid 7；
Step 7, terminal transmit " channel idle " information by authorizing frequency range up-link to base station；
Step 8, receive " channel idle " information after, FDD LTE-U base station takies unauthorized frequency range to terminal transmission number
According to；
Step 9, the terminal downlink transmission in unauthorized frequency range is persistently carried out, until data end of transmission or reach
Limit to the maximum duration taking unauthorized frequency range.
As preferably, in step 4, described " sharing request " information is when the unauthorized frequency range of terminal judges is accessed by oneself
Base station take, and utilize unauthorized frequency range be another or time multiple terminal carries out data transmission, terminal request base station
Unauthorized frequency range is carried out between the terminals the demand signalling shared.
As preferably, in steps of 5, if base station receives " sharing request " information, then base station one be scheduled on take unauthorized
When frequency range carries out downlink transmission, base station can assert that the terminal that transmission " shares request " does not has in unauthorized frequency range simultaneously
There is the interference receiving other adjacent base stations.
As preferably, in step 6, the design parameter of fallback mechanism sets and awards about non-according in 3GPP TS 36.213
Weighing frequent section carrier sense/collision avoids the fallback mechanism of middle regulation to carry out.
As preferably, in step 9, the downlink between FDD LTE-U base station and a certain terminal, it takies non-awarding
The maximum duration of power frequency range limits and determines with reference to parameter corresponding in 3GPP TS 36.213.
The present invention uses carrier sense mechanism based on incoming end, in FDD LTE-U base station under unauthorized frequency range is carried out
Before row transmission, by receiving terminal, i.e. terminal, rather than base station carries out the carrier sense of channel.When receiving terminal determine can access non-
Authorize frequency range when being transmitted, terminal can immediately by authorize frequency range feed back to one, base station can with the information of busy channel,
After LTE-U base station receives this signal, unauthorized frequency range can be taken immediately and carry out the transmission of downlink.Carrier wave is carried out by terminal
Intercept and can avoid " exposed terminal " and the problem of " concealed terminal " so that the parallel transmission chance in LTE-U base station network obtains
To abundant and appropriate use, there is the advantage increasing LTE-U network capacity.
Accompanying drawing explanation
Fig. 1 is the unauthorized frequency range cut-in method based on reception side carrier sense in the present invention a kind of LTE-U network
Schematic flow sheet.
Detailed description of the invention
In order to make those skilled in the art be better understood from the present invention program, attached below in conjunction with in present example
The embodiment of the present invention program is described in detail by figure.
Unauthorized frequency range cut-in method based on reception side carrier sense in the present invention a kind of LTE-U network, have employed
Carry out the mechanism of carrier sense based on receiving terminal, reached to solve " exposed terminal " and the purpose of " concealed terminal ", there is increase
The advantage of LTE-U network capacity.
Unauthorized frequency range cut-in method based on reception side carrier sense in a kind of LTE-U network, comprises the following steps:
Step 1:FDD LTE-U base station has data to carry out downlink transfer to terminal, due between LTE-U base station and terminal
Having reliable communication link authorizing in frequency range, base station first passes through mandate frequency range to this terminal transmission " carrier sense instruction " letter
Breath.
Step 2: after terminal receives " carrier sense instruction " information, immediately unauthorized frequency range is carried out carrier sense.As
Fruit finds that channel does not has occupied, then terminal thinks channel idle, proceeds to step 7；Otherwise, step 3 is proceeded to.
Step 3: if the base station that unauthorized frequency range is only accessed by terminal oneself takies, then terminal think can with in this base station
Other terminal shares unauthorized frequency range, then proceed to step 4；If the unauthorized frequency range of terminal judges is taken by adjacent base station, then
Proceed to step 6.
Step 4: terminal transmits " sharing a request " information by mandate frequency range up-link to FDD LTE-U base station,
Disturbed with notice base station oneself for by adjacent base station, and can other have taken unauthorized frequency range with in this base station
Downlink shares unauthorized frequency range.
Described " sharing request " information is that the base station accessed by oneself when the unauthorized frequency range of terminal judges takies, and is utilizing
Unauthorized frequency range be another or time multiple terminal carries out data transmission, terminal request base station is by unauthorized frequency range at these eventually
The demand signalling shared is carried out between end.
Step 5: after base station receives " sharing request " information, gives the dispatch channel resource of unauthorized frequency range and sends " channel
Idle " with multiple terminals of " sharing request ", thus carry out the parallel transmission of downlink, proceed to step 9.
If base station receives " sharing request " information, then base station one is scheduled on and takies unauthorized frequency range and carry out down link data
During transmission, meanwhile, base station can assert that the terminal that transmission " shares 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 this terminal by base station, it is achieved this terminal with the most
The parallel transmission of the downlink of the one or more terminals in this base station taking unauthorized frequency range.
Step 6: owing to expense authorizes frequency range to be taken by adjacent base station, terminal needs to perform fallback mechanism.The tool of fallback mechanism
Body parameter sets according to the rollback machine avoiding middle regulation in 3GPP TS 36.213 about unauthorized frequent section carrier sense/collision
System is carried out.In back off procedure, terminal judges is in unauthorized frequency range, and while the end of transmission of adjacent base station, channel is again by oneself
The base station accessed takies, if it is, proceed to step 4；Otherwise, terminal performs fallback mechanism always and can take to terminal judges
Channel, proceeds to step 7.
Step 7: terminal is by authorizing frequency range up-link to transmit " channel idle " information to base station, and notice base station can
With take unauthorized frequency range think oneself transmit data.
Step 8: after receiving " channel idle " information, FDD LTE-U base station takies unauthorized frequency range to terminal transmission number
According to.
Step 9: terminal downlink transmission in unauthorized frequency range is persistently carried out, until data end of transmission or reach
Limit to the maximum duration taking unauthorized frequency range.Downlink between FDD LTE-U base station and a certain terminal, it takies
The maximum duration of unauthorized frequency range refers to the parameter that in 3GPP TS36.213, the maximum duration of busy channel is corresponding and determines.
Advantage based on the unauthorized frequency range cut-in method receiving side carrier sense in the LTE-U network of the present invention exists
In: FDD LTE-U base station before unauthorized frequency range carries out downlink transmission, by receiving terminal rather than transmitting terminal carries out carrier wave
Intercept, can avoid " exposed terminal " and " concealed terminal " problem, thus realize FDD LTE-U base station in unauthorized frequency range also
Row transmission opportunity appropriate and making full use of, to promote the capacity of LTE-U network.
Above example is only the exemplary embodiment of invention, is not used in restriction invention, and protection scope of the present invention is by weighing
Profit claim limits.The present invention can be made various repairing in the essence of the present invention and protection domain by those skilled in the art
Changing or equivalent, this amendment or equivalent also should be regarded as being within the scope of the present invention.
Claims (5)
1. a unauthorized frequency range cut-in method based on reception side carrier sense, it is characterised in that comprise the following steps:
Step 1, FDD LTE-U base station have data to carry out downlink transfer to terminal, then base station first passes through mandate frequency range to this end
End transmission " carrier sense instruction " information；
After step 2, terminal receive " carrier sense instruction " information, unauthorized frequency range is carried out carrier sense, if channel does not has
Have occupied, proceed to step 7；Otherwise, step 3 is proceeded to；
If the base station that the unauthorized frequency range of step 3 is only accessed by terminal oneself takies, then proceed to step 4；If terminal judges is non-
Authorize frequency range to be taken by adjacent base station, then proceed to step 6；
Step 4, terminal transmit " sharing a request " information by authorizing frequency range up-link to FDD LTE-U base station；
After step 5, base station receive " sharing request " information, the dispatch channel resource of unauthorized frequency range is given and sends " channel idle "
The multiple terminals " sharing request ", thus carry out the parallel transmission of downlink, proceed to step 9；
The base station that step 6, the execution unauthorized frequency range of fallback mechanism, i.e. terminal judges are accessed by oneself takies, then proceed to step
4；Otherwise, terminal performs fallback mechanism always, until fallback mechanism terminates, terminal judges can proceed to step 7 with busy channel；
Step 7, terminal transmit " channel idle " information by authorizing frequency range up-link to base station；
Step 8, receive " channel idle " information after, FDD LTE-U base station takies unauthorized frequency range to terminal transmission data；
Step 9, the terminal downlink transmission in unauthorized frequency range is persistently carried out, until data end of transmission or reach to account for
Limit by the maximum duration of unauthorized frequency range.
2. as claimed in claim 1 based on the unauthorized frequency range cut-in method receiving side carrier sense, it is characterised in that in step
In rapid 4, described " sharing request " information is that the base station accessed by oneself when the unauthorized frequency range of terminal judges takies, and non-utilizing
Authorize frequency range be another or time multiple terminal carries out data transmission, terminal request base station by unauthorized frequency range in these terminals
Between carry out the demand signalling shared.
3. as claimed in claim 1 based on the unauthorized frequency range cut-in method receiving side carrier sense, it is characterised in that in step
In rapid 5, if base station receives " sharing request " information, then base station one is scheduled on and takies unauthorized frequency range and carry out down link data biography
Time defeated, base station can assert that the terminal that transmission " shares request " does not receive the dry of other adjacent base stations in unauthorized frequency range simultaneously
Disturb.
4. as claimed in claim 1 based on the unauthorized frequency range cut-in method receiving side carrier sense, it is characterised in that in step
In rapid 6, the design parameter of fallback mechanism set according in 3GPP TS 36.213 about unauthorized frequent section carrier sense/collision
The fallback mechanism avoiding middle regulation is carried out.
5. as claimed in claim 1 based on the unauthorized frequency range cut-in method receiving side carrier sense, it is characterised in that in step
In rapid 9, the downlink between FDD LTE-U base station and a certain terminal, its maximum duration taking unauthorized frequency range limits
Determine 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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| CN106211350B CN106211350B (en) | 2019-06-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108419266A (en) * | 2017-02-10 | 2018-08-17 | 华为技术有限公司 | A kind of channel sense method and transmitting end equipment |
| CN110214467A (en) * | 2017-02-01 | 2019-09-06 | 夏普株式会社 | Base station apparatus, terminal installation and communication means |
| WO2020093330A1 (en) * | 2018-11-08 | 2020-05-14 | 华为技术有限公司 | Spectrum resource determination method, apparatus, and system |
| CN113727458A (en) * | 2017-05-26 | 2021-11-30 | 华为技术有限公司 | Data sending method and communication equipment |
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| CN105208668A (en) * | 2014-06-06 | 2015-12-30 | 上海贝尔股份有限公司 | Carrier sensing method |
| CN105592464A (en) * | 2014-10-20 | 2016-05-18 | 索尼公司 | Base station side device, base station side method for wireless communication, user side device and user side method for wireless communication |
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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 |
| CN105208668A (en) * | 2014-06-06 | 2015-12-30 | 上海贝尔股份有限公司 | Carrier sensing method |
| CN105592464A (en) * | 2014-10-20 | 2016-05-18 | 索尼公司 | Base station side device, base station side method for wireless communication, user side device and user side method for wireless communication |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110214467A (en) * | 2017-02-01 | 2019-09-06 | 夏普株式会社 | Base station apparatus, terminal installation and communication means |
| CN108419266A (en) * | 2017-02-10 | 2018-08-17 | 华为技术有限公司 | A kind of channel sense method and transmitting end equipment |
| 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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| Publication number | Publication date |
|---|---|
| CN106211350B (en) | 2019-06-28 |
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