CN106358315A - Enhancement mode FBE frame structure suitable for unauthorized frequency band and channel access method - Google Patents
Enhancement mode FBE frame structure suitable for unauthorized frequency band and channel access method Download PDFInfo
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- CN106358315A CN106358315A CN201610991262.8A CN201610991262A CN106358315A CN 106358315 A CN106358315 A CN 106358315A CN 201610991262 A CN201610991262 A CN 201610991262A CN 106358315 A CN106358315 A CN 106358315A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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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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Abstract
The invention provides an enhancement mode FBE frame structure suitable for an unauthorized frequency band and a channel access method. The FBE frame structure comprises a free timeslot and a transmission timeslot, wherein the free timeslot comprises an initial CCA timeslot, a random retreat timeslot is arranged between the free timeslot and the transmission timeslot and comprises N expanded CCA timeslots, N is a random number within [1q], and q is 4-32. According to the enhancement mode FBE frame structure, by introducing a random retreat mechanism, the interception and access of a channel are realized, so that the channel access time can be regulated according to the condition that the channel is free or not, the collision problem which may be caused during the coexistence of an LTE-U node and an AP node of WIFI as well as the coexistence of LTE-U nodes of different operators can be solved, and the purpose of fair competition on the channel resources between the AP node of WIFI and the LTE-U node as well as the LTE-U nodes of the different operators is realized.
Description
Technical field
The present invention relates to the mobile radio networks technical field of hot zones, more particularly, to one kind be applied to unauthorized
The enhancement mode fbe frame structure of frequency range and channel access method.
Background technology
Towards the year two thousand twenty and future, thousand times of 5g network faces data traffic increases, hundred billion equipment connect and diversified
Business demand etc. is challenged, and in order to meet future wireless system business exponential increase data flow increased requirement, excavation is more can
Frequency spectrum resource, lte is deployed to unauthorized frequency range in the form of node by operator's consideration, and (unauthorized frequency range refers to meeting
It is not necessary to the resource of frequency range that just can directly use of government authorization under government department's radio control, wi-fi is to be deployed in unauthorized
The typical technology of frequency range), unauthorized frequency range adopts lte air protocol, i.e. lte-u, completes to communicate.Using lte-u technology,
Can utilize centralized dispatching, interference coordination, the technology such as self adaptation request retransmission (harq), compared to access technologies such as wifi,
Lte-u system has more preferable robustness, it is possible to obtain higher spectrum efficiency, expands lte power system capacity, provides bigger covering
Lid scope and more preferable Consumer's Experience, reduce communications cost, improve lte in the economic effect authorizing frequency range and unauthorized frequency range
Benefit.
The matter of utmost importance that lte faces in the deployment of unauthorized frequency range is the coexistence problems with other existing access technologies, and lbt
(listen before talk, listem-before-talk) mechanism has obtained consistent accreditation in terms of solving coexistence problems.3gpp (the third generation
Partner program) intend using esti (european telecommunications standards institute, Europe
Telecommunication standard association) two kinds of mechanism load based equipment (lbe, the Channel Detection mechanism based on load) in standard
Carry out lbt process, wherein fbe frame knot with frame based equipment (fbe, the Channel Detection mechanism based on frame structure)
Structure, as shown in figure 1, including free timeslot and transmission time slot, comprises cca time slot, the length of wherein transmission time slot is in free timeslot
1ms～10ms, the length of free timeslot is at least the 5% of transmission time slot.
The execution flow process of fbe channel access is as follows: cca (clear channel assessment, idle letter are first carried out
Road assess) detection, if channel idle is detected within the persistent period, immediately send data, cot (transmission time) terminate or
When person's data is activation finishes, then discharge channel resource, then retain one section at least the 5% of cot of preferable free time, wherein
Including a cca persistent period；If it is busy channel is detected, it is not transmitted data, carry out cca inspection in next frame structure
Survey, if channel idle, send data, otherwise, continue waiting for next frame structure, and so on.
The lte-u node carrying out lbt using fbe mechanism is competing with the ap node of the wifi carrying out lbt using csma/ca mechanism
When striving same channel resource, because the position of cca time slot in fbe frame structure is relatively fixed and intercept receiver can lack, it is possible that
Following two problems:
First problem, as shown in Fig. 2 in hot zones, when lte-u node is continuously transmitted, the ap section of wifi
The backoff counter of point can only carry out successively decreasing of backoff counter, thus leading in the preferable free time section of fbe frame structure
Wifi node accesses channel device can be very few.
Second Problem, as shown in Figure 3 and Figure 4, there may be between hot zones, different operators shared same not
Authorize the situation of frequency spectrum, when the lte-u node of an operator accesses channel and carries out data traffic transmission always, that
The lte-u node of other operators intercepts during channel the always busy information of feedback channel, thus leading to block it is impossible to access
Channel, no matter the signal of each operator is synchronous or asynchronous in sequential.
Understood based on described above, when lte-u is coexisted with wifi, fbe frame structure can lead to the ap node of wifi to access
The chance of channel greatly reduces；When the lte-u node that different operators are disposed simultaneously coexists, fbe frame structure can lead to only have
One operator can access channel and be transmitted.
Content of the invention
For above-mentioned the deficiencies in the prior art, the present invention provides a kind of enhancement mode fbe frame knot being applied to unauthorized frequency range
Structure and channel access method, can less and intercept position and be relatively fixed and led to by intercepting channel device to solve existing fbe mechanism
The wifi handling capacity when lte-u and wifi coexists be pressed and only one of which when the lte-u node of different operators coexists
The lte-u node of operator can be successfully accessed the problem of channel.
To achieve these goals, one aspect of the present invention provides a kind of enhancement mode fbe frame knot being applied to unauthorized frequency range
Structure, it includes a free timeslot and a transmission time slot, comprises an initial cca time slot it is characterised in that institute in described free timeslot
State and between free timeslot and described transmission time slot, be provided with a random back time slot, described random back time slot comprises n extension cca
Time slot, wherein n are the random number between [1q], and the span of q is 4～32.
Preferably, the length of described initial cca time slot is not less than 20us.
Preferably, the length of described extension cca time slot is not less than 20us.
Preferably, the length of described transmission time slot is 1ms～10ms.
Preferably, the length of described free timeslot is at least the 5% of described transmission time slot.
Another aspect of the present invention provides a kind of enhancement mode fbe channel access method being applied to unauthorized frequency range, to realize
The channel access of lte-u node is it is characterised in that comprise the following steps:
S1, chooses the backoff counter that random number n is stored in lte-u node, the span of q is 4～32 between [1q]；
S2, makes lte-u node execute initial cca detection, if channel idle is detected within the initial cca persistent period,
Then execution step s3；Otherwise, lte-u node is made to continuously carry out initial cca detection, until the initial cca persistent period terminates；
S3, detects whether described backoff counter is 0, if not being 0, execution step s4；If 0, lte-u is made to save
Point immediately accesses channel and carries out data transmission in transmission time, retains one section of blank time, then after DTD
Return to step s1；
S4, makes lte-u node execute extension cca detection, if channel idle is detected within the extension cca persistent period,
Described backoff counter is then made to subtract 1, whether be 0, if 0, then proceed to step s3, such as if then judging that described backoff counter subtracts
Fruit is not 0, then make lte-u node repeat extension cca detection, until backoff counter is 0；If continued in extension cca
It is not detected by channel idle in time, then freeze described backoff counter, return to step s2.
Preferably, the initial cca persistent period in described step s2 is not less than 20us.
Preferably, the transmission time in described step s3 is 1ms～10ms.
Preferably, the initial cca persistent period sum in the blank time in described step s3 and described step s2 is at least
For transmission time 5%.
Preferably, the extension cca persistent period in described step s4 is not less than 20us.
By adopting technique scheme, the invention has the following beneficial effects:
The present invention by introduce random backoff mechanism realize channel sense and access, such that it is able to the free time according to channel with
No adjustment accesses the time of channel, coexisted with the ap node solving lte-u node and wifi and different operators lte-u
Institute's issuable collision problem when node coexists, and then realize between the ap node of wifi and lte-u node and different
The purpose of the fair competition channel resource between the lte-u node of operator.It can be seen that, after the present invention, in hot zones
In mobile radio networks, in unauthorized frequency range, lte-u node can be with harmonious coexistence with the ap node of wifi.
Brief description
Fig. 1 is applied to the structural representation of the fbe frame structure of unauthorized frequency range for prior art；
Fig. 2 is the schematic diagram of the lte-u node using existing fbe frame structure and the ap node competitive channel of wifi；
Fig. 3 adopts the signal of lte-u node competitive channel in timing synchronization of existing fbe frame structure for different operators
Figure；
Fig. 4 adopts the signal of lte-u node competitive channel when sequential is asynchronous of existing fbe frame structure for different operators
Figure；
Fig. 5 is applied to the structural representation of the enhancement mode fbe frame structure of unauthorized frequency range for the present invention；
The flow chart that Fig. 6 is applied to the enhancement mode fbe channel access method of unauthorized frequency range for the present invention；
Fig. 7 is the schematic diagram of indoor focus Coexisting Field scape；
Fig. 8 is coexisted with the ap node of wifi using the lte-u node of enhancement mode fbe frame structure of the present invention for different operators
When, the sequential chart that channel resource may be utilized；
Fig. 9 is the handling capacity comparison diagram of different low power nodes co-existence schemes.
Specific embodiment
Below in conjunction with the accompanying drawings, provide presently preferred embodiments of the present invention, and be described in detail, make to be better understood when this
Bright function, feature.
For the traditional fbe frame structure being applied to unauthorized frequency range in hot zones, the present invention proposes a kind of improved increasing
Strong type fbe frame structure, i.e. e-fbe (enhanced fbe) frame structure.E-fbe frame structure is as shown in figure 5, it remains tradition
The free timeslot of fbe frame structure and transmission time slot design, the length of transmission time slot is 1ms～10ms, and the length of free timeslot is extremely
Less be transmission time slot 5%, and free timeslot comprise a length be not less than 20us cca time slot, in order to cca time slot below
Make a distinction, be named as initial cca (icca) time slot herein, the wherein length of icca time slot is not less than 20us.In addition, originally
Invention is additionally arranged random back time slot at one's leisure between gap and transmission time slot, this random back time slot is by n extension cca
(ecca) time slot is constituted, and wherein n is the random number between [1q], and the span of q is determined by operator, according to esti regulation, q
Scope be [4 32].
The maximum feature of e-fbe frame structure is just the introduction of random backoff mechanism to carry out channel sense and access, and
And need all the time before data is activation to execute stochastic backoff process, its corresponding e-fbe channel access method is as shown in fig. 6, wrap
Include following steps:
S1, when lte-u node needs to carry out data transmission, randomly selects several n in [1q] and is stored in first and keep out of the way counting
Device, the span of q is determined by operator, and according to esti regulation, the scope of q is [4 32].
S2, lte-u node execution initial cca detection, if detected in initial cca persistent period (not less than 20us)
Channel idle, then execution step s3；Otherwise, lte-u node continuously carries out initial cca detection, until the initial cca persistent period ties
Bundle；
S3, whether detection backoff counter is 0, if not being 0, execution step s4；Otherwise, lte-u node connects immediately
Enter channel and carry out data transmission in transmission time cot, transmission time keeps the design of traditional fbe mechanism, can arrive in 1ms
Select in 10ms, after DTD, retain one section of blank time, this blank time also keeps the design of traditional fbe mechanism,
It is referred to as free time with initial cca persistent period sum, and free time is at least transmits the 5% of duration cot, and blank time is tied
Return to step s1 after bundle.
S4, lte-u node execution extension cca (i.e. ecca) detection, the extension cca persistent period is not less than 20us, if
Ecca failure, is not detected by channel idle within the extension cca persistent period, then freezes backoff counter, return to step s2；As
Fruit ecca success, detects channel idle, then backoff counter subtracts 1 within the extension cca persistent period, and meter is kept out of the way in then detection
Whether number device is 0, if 0, then proceeds to step s3, otherwise, repeats extension cca detection, until backoff counter is 0.
It can be seen that, the present invention introduces random backoff mechanism in traditional fbe mechanism and carries out channel sense, thus can be according to letter
Road state neatly carries out channel sense and access.And, in intercepting channel procedure, the present invention is carried out at the very start at random
Keep out of the way the generation with collision free, rather than carry out random back due to producing collision.
Based on described above, the present invention can be applicable in the mobile radio system of hot zones, is mainly used in lte and exists
Frequency spectrum resource is more reasonably competed on unauthorized frequency range, application scenarios are as shown in Figure 7.Fig. 7 is illustrated that an indoor lte-u
The Sample Scenario coexisting with wifi, long l be 120m, wide w be the ap of lte-u node and wifi in the office building (monolayer) of 50m
Node is arranged in corridor uniformly at random.Office building is densely populated place, either lte-u node or the ap of wifi
Node is required for carrying out substantial amounts of data traffic unloading.Assume that lte-u node and the ap node of wifi all continuously need
Carry out data traffic unloading, it is as follows that it coexists the process of competitive channel resource:
When the ap node of lte-u node and wifi all has transmission demand, ap node carries out channel using csma/ca mechanism
Intercept, if channel idle, immediately access channel and carry out data transmission, at the end of end of transmission or transmission time, release
Channel resource；If also needing to proceed transmits, need to execute binary exponential backoff process, that is, in competition window with
Machine generates a random number, and when detecting channel idle, random number subtracts 1, when random number is kept to 0, continues to access channel
It is transmitted；And lte-u node is when intercepting channel, no matter whether channel idle, is required to, according to e-fbe frame structure, counting
Execute stochastic backoff process according to before transmission, in competition window, generate at random a random number, when detecting channel idle
When, random number subtracts 1, when random number is kept to 0, accesses channel and carries out data transmission, thus can avoid when ap node and
Lte-u node is concurrently accessed channel and produces the situation of collision when all detecting channel idle.Be worth explanation be a bit,
The contention window size of csma/ca mechanism and e-fbe structure is different, and the competition window of csma/ca mechanism touches in generation
Can be increased according to binary system index rule after hitting, and the competition window of e-fbe structure is then determined by operator, with collision with
No unrelated, competition window herein refers to the span of random data.
The ap node of the wifi of an in figure part or lte-u node are changed into the lte-u node of another operator, when not
With operator lte-u node competitive channel resource when, due to all according to e-fbe structure send data service before execute with
Machine backoff procedure, and random number n is to randomly choose in competition window set by different operators, so node connects simultaneously
The probability entering channel is very little, thus solving the problems, such as to produce collision between different operators lte-u node.
When the ap node of wifi and the lte-u node of different operators coexist, constitute the deployment scenario of mixing.Assume institute
There is " node " that single channel resource is at war with, the sequential that channel resource may be utilized is as shown in Figure 8.Sharp from channel
Sequential chart can be seen that whether e-fbe frame structure can adjust, according to the free time of channel, the time accessing channel, to solve
When coexisting when the ap node of lte-u node and wifi coexists and between the lte-u node of different operators, institute is issuable
Collision problem, realizes fair competition channel between the ap node of wifi and the lte-u node of lte-u node and different operators
The purpose of resource.
In order to simplify the deployment scenario of mixing it is assumed that set embodiment Zhong Youliangge operator, it is named as operator a and fortune
Battalion business b, ap node and lte-u node (are referred to as low work(by handling capacity contrast when coexisting by following three kinds of schemes as shown in Figure 9
Rate node):
(1) operator a and b disposes wifi, and the number of ap node is respectively 6.
(2) operator a deployment wifi, ap interstitial content is 6, and operator b deployment lte-u node, number is also for 6,6
Lte-u node is respectively using fbe frame structure and e-fbe frame structure.
(3) operator a and b disposes lte-u node, and number is respectively 6, and respectively simultaneously using fbe and e-fbe frame
Structure.
Under wifi and lte-u coexists scene, from Fig. 9,3 and 4 as can be seen that adopt the lte-u node of fbe frame structure
Suppress the handling capacity of the ap node of wifi；And 5 and 6 show that the lte-u node employing e-fbe frame structure is coexisting scene
In the ap node of wifi can be allowed to obtain almost equal therewith handling capacity；Can obtain from 7 and 8, in adopting of different operators deployment
Coexist under scene with the lte-u node of fbe frame structure, the lte-u node of only one of which operator can transmit, and 9 and 10
Reflect the lte-u node employing e-fbe frame structure, the lte-u node of different operators obtains almost equal handling up
Amount.
Result above shows, e-fbe frame structure can solve the problems, such as that fbe frame structure is also easy to produce collision substantially, realizes
The purpose of fair competition channel resource between the ap node of wifi and the lte-u node of lte-u node and different operators.
Above-described, only presently preferred embodiments of the present invention, it is not limited to the scope of the present invention, the present invention's is upper
State embodiment can also make a variety of changes.I.e. every claims according to the present patent application and description are made
Simply, equivalence changes and modification, falls within the claims of patent of the present invention.Being of the not detailed description of the present invention
Routine techniquess content.
Claims (10)
1. a kind of enhancement mode fbe frame structure being applied to unauthorized frequency range, it includes a free timeslot and a transmission time slot, described
Comprise an initial cca time slot in free timeslot it is characterised in that be provided between described free timeslot and described transmission time slot one with
Machine backoff period, described random back time slot comprises n extension cca time slot, and wherein n is the random number between [1q], and the taking of q
Value scope is 4～32.
2. the enhancement mode fbe frame structure being applied to unauthorized frequency range according to claim 1 it is characterised in that described just
The length of beginning cca time slot is not less than 20us.
3. the enhancement mode fbe frame structure being applied to unauthorized frequency range according to claim 1 is it is characterised in that described expansion
The length of exhibition cca time slot is not less than 20us.
4. the enhancement mode fbe frame structure being applied to unauthorized frequency range according to claim 1 is it is characterised in that described biography
The length of defeated time slot is 1ms～10ms.
5. the enhancement mode fbe frame structure being applied to unauthorized frequency range according to claim 1 is it is characterised in that described sky
The length of idle gap is at least the 5% of described transmission time slot.
6. a kind of enhancement mode fbe channel access method being applied to unauthorized frequency range, to realize the channel access of lte-u node,
It is characterized in that, comprise the following steps:
S1, chooses the backoff counter that random number n is stored in lte-u node, the span of q is 4～32 between [1q]；
S2, making lte-u node execute initial cca detection, if channel idle is detected within the initial cca persistent period, holding
Row step s3；Otherwise, lte-u node is made to continuously carry out initial cca detection, until the initial cca persistent period terminates；
S3, detects whether described backoff counter is 0, if not being 0, execution step s4；If 0, lte-u node is made to stand
Access channel and carry out data transmission in transmission time, retain one section of blank time after DTD, be then back to
Step s1；
S4, making lte-u node execute extension cca detection, if channel idle is detected within the extension cca persistent period, making
Described backoff counter subtracts 1, and whether be 0, if 0, then proceed to step s3, if not if then judging that described backoff counter subtracts
For 0, then lte-u node is made to repeat extension cca detection, until described backoff counter is 0；If continued in extension cca
It is not detected by channel idle in time, then freeze described backoff counter, return to step s2.
7. the enhancement mode fbe channel access method being applied to unauthorized frequency range according to claim 1 it is characterised in that
The initial cca persistent period in described step s2 is not less than 20us.
8. the enhancement mode fbe channel access method being applied to unauthorized frequency range according to claim 1 it is characterised in that
Transmission time in described step s3 is 1ms～10ms.
9. the enhancement mode fbe channel access method being applied to unauthorized frequency range according to claim 1 it is characterised in that
Blank time in described step s3 is at least the 5% of transmission time with the initial cca persistent period sum in described step s2.
10. the enhancement mode fbe channel access method being applied to unauthorized frequency range according to claim 1 it is characterised in that
The extension cca persistent period in described step s4 is not less than 20us.
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