CN109982432A - A kind of listem-before-talk method for parameter configuration of the equipment based on load - Google Patents
A kind of listem-before-talk method for parameter configuration of the equipment based on load Download PDFInfo
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- CN109982432A CN109982432A CN201811504206.2A CN201811504206A CN109982432A CN 109982432 A CN109982432 A CN 109982432A CN 201811504206 A CN201811504206 A CN 201811504206A CN 109982432 A CN109982432 A CN 109982432A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001174 ascending effect Effects 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 description 16
- 238000005265 energy consumption Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000013468 resource allocation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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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
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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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 relates to a kind of listem-before-talk method for parameter configuration of equipment based on load, wherein base station is that terminal configures LBE LBT maximum execution times N and/or LBE LBT maximum executes duration T；When the base station executes ascending resource distribution every time, the number that the terminal executes LBE LBT is no more than LBE LBT maximum execution times N and/or total time of length no more than LBE LBT maximum of terminal execution LBE LBT executes duration T.The present invention meets the delay requirement of different business and the horsepower requirements of different terminals, and can adapt to improve the transmission performance of system in complicated dynamic interference environment by reasonably configuring LBE LBT parameter for terminal.
Description
Technical field
The present invention relates to wireless communication technique more particularly to a kind of listem-before-talk parameter configuration sides of the equipment based on load
Method.
Background technique
With the rapid development of wireless mobile telecommunication technology, demand of all trades and professions to wireless communication is increasing.But by
It is extremely limited in available radio spectrum resources, it causes in identical frequency range, multiple communication system, multiplex communication system are long
The case where phase coexists.For example, there are many frequency points that can aperiodically be occupied by multiple departments in 223-235MHz band limits, wrap
Include: power department is for disposing electric power wireless communication system, to push the construction of smart grid；Ministry of Geology and Mineral Resources is used for telemetering water
Position instrument；Ministry of Water Resources is used for hydrological telemetering；Ministry of Light Industry is used for electronic crane scale；State Seismological Bureau transmits for data；The Ministry of Construction uses
It is transmitted in data；National Meteorological Bureau is for data transmission etc..There is uncertainty in the frequency point holding time of above section purposes, lead to
It is often occupied for burst, this makes the wireless communications environment of the frequency range that can continually change.The case where this condition of multi-system coexistence
It inevitably will cause the interference in some area of space, frequency range, time interval, coding section, seriously affect wireless
The communication quality and data traffic of communication system.
Interfering with each other between multiple wireless communication systems in order to avoid using similar frequency bands, wireless communication system should be adopted
With listem-before-talk (listen-before-talk, LBT) technology.Letter must first be monitored before sending data using the equipment of LBT
Whether road is occupied, if channel idle within a certain period of time (such as out of randomly selected in competition window back off time),
Then equipment busy channel and can start to transmit.By using LBT technology, wireless communication system be can effectively avoid and other systems
Interfering with each other between system realizes the different coexistence of systems under complicated dynamic interference environment.
LBT is commonly divided into the LBT of the equipment (frame-based equipment, FBE) based on frame and based on load
The LBT of equipment (load-based equipment, LBE).FBE LBT is provided with a channel detection period, in each period
LBT Channel Detection of interior execution；If detecting channel idle, equipment busy channel and can start to transmit；If detection
Busy to channel, then equipment is unable to busy channel within this period, until until next cycle LBT time slot continue into
Row detection.When executing LBE LBT, equipment carries out initial channel detection first, can busy channel if channel idle；If letter
Road is busy, then after keeping out of the way a period of time, a Channel Detection number q is randomly choosed out of competition window, detects in q secondary channel
Detecting in time just can busy channel after channel idle.FBE LBT mechanism realizes that simply Channel Detection time slot is relatively fixed.
And LBE LBT mechanism is complex, Channel Detection Time has biggish randomness, but LBE LBT mechanism is more flexible, can root
Channel occupancy probabilities are adjusted according to the loading condition of equipment.Therefore, both LBT mechanism are each advantageous, are applicable to different answer
Use scene.
For LBE LTE, using different LBT parameter (including LBT execute number, competition window length, keep out of the way when
Between length etc.) significant impact can be caused to performances such as throughput of system, propagation delay time, terminal energy consumptions.In view of wireless communication
Business diversity, the complexity of the otherness of terminal capabilities and disturbance regime of system, base station should according to different business demands,
Terminal energy requirements and disturbed condition configure different LBT parameters for different terminals, to optimize propagation delay time, terminal energy consumption etc.
Performance.For example, service delay is required it is lower, terminal energy sources are limited and disturbed condition variation infrequently the case where, should reduce
Terminal executes the frequency of LBT, avoids unnecessary energy consumption；And it is more demanding for service delay, terminal energy sources are sufficient, with
And disturbed condition changes frequent situation, terminal should be made more frequently to execute LBT, to complete data transmission as early as possible, reduces transmission
Time delay.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, the present invention is intended to provide a kind of equipment based on load is first listened
After say method for parameter configuration, to meet the delay requirement of different business and the horsepower requirements of different terminals, and can adapt in multiple
Miscellaneous dynamic interference environment, improves the transmission performance of system.
A kind of listem-before-talk method for parameter configuration of equipment based on load of the present invention comprising following steps:
Step a, base station is that terminal configures LBE LBT maximum execution times N and/or LBE LBT maximum executes duration T；
Step b, when base station executes ascending resource distribution every time, the number that the terminal executes LBE LBT is no more than described
LBE LBT maximum executes times N and/or the terminal executes total time of length no more than LBE LBT maximum of LBE LBT
Execute duration T.
In the listem-before-talk method for parameter configuration of the above-mentioned equipment based on load, the step b includes:
Step b1, the base station are the one or more continuous subframes of terminal distribution；
Step b2, the terminal execute in first sub-frame of uplink in the continuous subframe of one or more being assigned
Uplink LBE LBT, and judge whether LBT succeeds, if so, the terminal carries out uplink since the sub-frame of uplink, it is no
Then, further judge whether the terminal has performed n times uplink LBE LBT or the total time of execution uplink LBE LBT is long
Whether degree executes duration T more than LBE LBT maximum or whether has exhausted the last one assigned subframe, if so, abandoning this
Secondary uplink returns and executes the step b1, otherwise the ascending resource distribution for waiting the base station to execute next time executes
Step b3；And
The step b3, the terminal executes uplink LBE LBT after keeping out of the way one section of preset time span again, and judges
Whether LBT succeeds, if so, the terminal carries out uplink since next OFDM symbol or next sub-frame of uplink,
Otherwise, further judge whether the terminal has performed n times uplink LBE LBT or executed the total time of uplink LBE LBT
Whether length executes duration T more than LBE LBT maximum or whether has exhausted the last one assigned subframe, if so, abandoning
This time uplink returns and executes the step b1, and the ascending resource for waiting the base station to execute next time distributes, and otherwise, returns
Receipt row step b3.
Further, in the step a, the base station is also terminal configuration: competition window length, the time kept out of the way are long
Degree and uplink initial position.
Further, in the step b3, the terminal is kept out of the way according to the time span kept out of the way that base station configures
Afterwards, a Channel Detection number q is randomly choosed out of competition window, if continuously detecting channel in q secondary channel detection time
Free time, then LBT success；Otherwise, LBT fails.
Due to using above-mentioned technical solution, the present invention can be according to different business demands, terminal by base station
Energy requirements and disturbed condition configure different LBT parameters for different terminals, to optimize the performances such as propagation delay time, terminal energy consumption.
Service delay is required it is lower, terminal energy sources are limited and disturbed condition variation infrequently the case where, can configure less LBE
LBT executes number and shorter LBE LBT executes duration, to reduce the frequency that terminal executes LBT, avoids unnecessary energy
Consumption；And it is more demanding for service delay, terminal energy sources are sufficient and disturbed condition changes frequent situation, can configure compared with
More LBE LBT executes number and longer LBE LBT executes duration, to make terminal more frequently execute LBT, with complete as early as possible
It is transmitted at data, reduces propagation delay time.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the listem-before-talk method for parameter configuration of the equipment based on load of the present invention；
Fig. 2 is the structural schematic diagram of wireless communication system in specific embodiments of the present invention；
Fig. 3 is the structural schematic diagram for the frame that wireless communication system uses in specific embodiments of the present invention.
Specific embodiment
With reference to the accompanying drawing, presently preferred embodiments of the present invention is provided, and is described in detail.
As shown in Figure 1, of the invention, i.e., the listem-before-talk method for parameter configuration of a kind of equipment based on load, including it is following
Step:
Step S1, base station are that terminal configures LBE LBT maximum execution times N and/or LBE LBT maximum executes duration T；
Wherein, LBE LBT maximum executes times N and refers to for the distribution of each ascending resource, the at most executable n times LBE of terminal
LBT；Assuming that base station is that the one or more continuous subframes of terminal distribution carry out uplink, then terminal is from first uplink
Frame starts to execute LBE LBT；If LBT success, terminal are transmitted in subsequent assigned sub-frame of uplink；If LBT fails,
Then terminal executes LBE LBT after keeping out of the way a period of time again, until n-th LBE LBT or to have exhausted the last one assigned
Subframe；If last time LBE LBT still fails, this uplink is abandoned, waits resource allocation next time；
LBE LBT maximum executes duration T and refers to that, for the distribution of each ascending resource, terminal executes the maximum time of LBE LBT
Length is T；Assuming that base station has been terminal distribution, one or more continuous subframes carry out uplink, then terminal is from first
Row subframe starts to execute LBE LBT；If LBT success, terminal are transmitted in subsequent assigned sub-frame of uplink；If LBT
Failure, then terminal executes LBE LBT after keeping out of the way a period of time again, until the total time length for executing LBE LBT is more than T or
Exhaust the last one assigned subframe；If last time LBE LBT still fails, this uplink is abandoned, under waiting
First resource distribution；
In addition, in addition to the parameters discussed above, base station can also configure following parameter for terminal:
1) competition window length: fixed competition window length or variable competition window length are (for example, LBT loses every time
It loses rear double)
2) back off time length: fixed back off time length or variable back off time length are (for example, LBT loses every time
It loses rear double)
3) uplink initial position: next OFDM symbol or next sub-frame of uplink；
Step S2, base station are the one or more continuous subframes of terminal distribution to carry out uplink；
Step S3, terminal execute uplink in first sub-frame of uplink in the continuous subframe of one or more being assigned
LBE LBT, and judge whether LBT is successful (that is, the initial channel detection for executing LBE LBT), if LBT success is (that is, detect letter
Road is idle), then terminal carries out uplink since the sub-frame of uplink, otherwise (that is, detecting that channel is busy), judges terminal
Whether the total time length for whether having performed n times uplink LBE LBT or execution uplink LBE LBT is maximum more than LBE LBT
It executes duration T or whether has exhausted the last one assigned subframe, if terminal has performed n times uplink LBE LBT or held
The total time length of row uplink LBE LBT alreadys exceed LBE LBT maximum execution duration T or has exhausted the last one and is assigned
Subframe, then abandon this uplink, return to step S2, base station is waited to execute ascending resource distribution next time, it is no
Then (that is, the number for executing uplink LBE LBT is less than n times and executes the total time length of uplink LBE LBT less than LBE LBT
Maximum executes duration T and subsequent still has assigned subframe), execute step S4；
Step S4, terminal executes uplink LBE LBT after keeping out of the way one section of preset time span again, and whether judges LBT
Success, if LBT success (that is, detecting channel idle), terminal is since next OFDM symbol or next sub-frame of uplink
Carry out uplink, otherwise (that is, detecting that channel is busy), judge terminal whether performed n times uplink LBE LBT or
It is to execute the total time length of uplink LBE LBT whether more than LBE LBT maximum to execute duration T or whether exhausted last
A assigned subframe, if terminal performed n times uplink LBE LBT or execute uplink LBE LBT total time length
Duration T is executed more than LBE LBT maximum or has exhausted the last one assigned subframe, then abandons this uplink, is returned
Step S2 is executed, the ascending resource for waiting base station to execute next time distributes, otherwise (that is, the number for executing uplink LBE LBT is less than
N times and execute the total time length of uplink LBE LBT less than LBE LBT maximum execute duration T and it is subsequent still have divided
The subframe matched), return to step S4；
In step S4, after the back off time length that terminal is configured according to base station is kept out of the way, out of competition window with
Machine selects a Channel Detection number q, if continuously detecting channel idle in q secondary channel detection time, LBT success；It is no
Then, LBT fails.
2 pairs of of the invention specific embodiments are described in detail with reference to the accompanying drawing.
As shown in Fig. 2, base station 1 provides radio communication service for first to third terminal 2-4, first to third terminal 2-4
Nearby there is different system interference source, therefore, first to third terminal 2-4 needs to be implemented LBT operation before transmitting uplink data.
For the frame structure that electric power wireless communication system uses as shown in figure 3, wherein subframe 0 is downlink subframe, subframe 1 is special
Subframe, wherein including DwPTS (descending pilot frequency time slot), GP (protection interval), three parts UpPTS (uplink pilot time slot), son
Frame 2,3 and 4 is sub-frame of uplink.
The present embodiment is realized especially by following steps:
Step S1, base station 1 are that the configuration LBE LBT maximum execution number of first terminal 2 is 1 time；Base station 1 is second terminal 3
Configuring LBE LBT maximum and executing number is 3 times, and LBE LBT maximum a length of 10ms when executing, competition window length is CW, is kept out of the way
Time span is BO, and uplink initial position is next OFDM symbol；
Step S2, base station 1 are that first terminal 2 is assigned with UpPTS in the subframe 0 on channel 1#, subframe 2,3 and 4；Base station
1 is assigned with UpPTS in the subframe 0 on channel 2#, subframe 2,3 and 4 for second terminal 3；
Step S3, first terminal 2 and second terminal 3 execute initial channel detection in subframe 0 respectively,
If the LBT success of first terminal 2, carries out uplink, otherwise, since its LBE LBT maximum is held since UpPTS
Row number is 1, and first terminal 2 abandons this uplink, waits the resource allocation next time of base station 1；
If the LBT success of second terminal 3, carries out uplink, otherwise, due to being less than its LBE LBT since UpPTS
Maximum executes number (3 times) and LBE LBT maximum execution duration (10ms), and subsequent still has assigned subframe, second terminal 3
Execute step S4；
Step S4, after the back off time length BO that second terminal 3 is configured according to base station is kept out of the way, out of competition window CW
A Channel Detection number q is randomly choosed, if continuously detecting channel idle in q secondary channel detection time, LBT success,
Otherwise, LBT fails；
If LBT success, second terminal 3 carry out uplink since next OFDM symbol, otherwise, judge that second is whole
Whether whether end 3 has performed 3 LBT or executed the total time length of LBE LBT more than 10ms or has exhausted last
One assigned subframe, if so, second terminal 3 abandons this uplink, return step S2 waits the next of base station 1
Otherwise secondary resource allocation returns to step S4.
Above-described, only presently preferred embodiments of the present invention, the range being not intended to limit the invention, of the invention is upper
Stating embodiment can also make a variety of changes.Letter made by all claims applied according to the present invention and description
Single, equivalent changes and modifications, fall within the claims of the invention patent.The not detailed description of the present invention is normal
Advise technology contents.
Claims (4)
1. a kind of listem-before-talk method for parameter configuration of the equipment based on load, which is characterized in that the method includes following steps
It is rapid:
Step a, base station is that terminal configures LBE LBT maximum execution times N and/or LBE LBT maximum executes duration T；
Step b, when base station executes ascending resource distribution every time, the number that the terminal executes LBE LBT is no more than the LBE
LBT maximum executes times N and/or the terminal executes total time of length no more than LBE LBT maximum execution of LBE LBT
Duration T.
2. the listem-before-talk method for parameter configuration of the equipment according to claim 1 based on load, which is characterized in that described
Step b includes:
Step b1, the base station are the one or more continuous subframes of terminal distribution；
Step b2, the terminal execute uplink in first sub-frame of uplink in the continuous subframe of one or more being assigned
LBE LBT, and judge whether LBT succeeds, if so, the terminal carries out uplink since the sub-frame of uplink, otherwise, into
One step judges whether the terminal has performed n times uplink LBE LBT or the total time length of execution uplink LBE LBT is
It is no to execute duration T more than LBE LBT maximum or whether exhausted the last one assigned subframe, if so, abandoning on this time
Row transmission, returns and executes the step b1, otherwise the ascending resource distribution for waiting the base station to execute next time executes step
b3；And
The step b3, the terminal executes uplink LBE LBT after keeping out of the way one section of preset time span again, and judges LBT
Whether succeed, if so, the terminal carries out uplink since next OFDM symbol or next sub-frame of uplink, it is no
Then, further judge whether the terminal has performed n times uplink LBE LBT or the total time of execution uplink LBE LBT is long
Whether degree executes duration T more than LBE LBT maximum or whether has exhausted the last one assigned subframe, if so, abandoning this
Secondary uplink returns and executes the step b1, otherwise the ascending resource distribution for waiting the base station to execute next time returns
Execute step b3.
3. the listem-before-talk method for parameter configuration of the equipment according to claim 2 based on load, which is characterized in that in institute
It states in step a, the base station is also terminal configuration: competition window length, the time span kept out of the way and uplink start bit
It sets.
4. the listem-before-talk method for parameter configuration of the equipment according to claim 3 based on load, which is characterized in that in institute
It states in step b3, after the terminal is kept out of the way according to the time span kept out of the way that base station configures, is selected at random out of competition window
A Channel Detection number q is selected, if continuously detecting channel idle in q secondary channel detection time, LBT success；Otherwise,
LBT failure.
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| CN201811504206.2A CN109982432A (en) | 2018-12-10 | 2018-12-10 | A kind of listem-before-talk method for parameter configuration of the equipment based on load |
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| CN201811504206.2A CN109982432A (en) | 2018-12-10 | 2018-12-10 | A kind of listem-before-talk method for parameter configuration of the equipment based on load |
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| CN113032033A (en) * | 2019-12-05 | 2021-06-25 | 中国科学院深圳先进技术研究院 | Automatic optimization method for big data processing platform configuration |
| WO2021174472A1 (en) * | 2020-03-05 | 2021-09-10 | Qualcomm Incorporated | Contiguous uplink transmission in contention-based access systems |
| WO2022116077A1 (en) * | 2020-12-03 | 2022-06-09 | 华为技术有限公司 | Communication method and apparatus |
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Application publication date: 20190705 |