CN104640230B - A kind of user equipment access method and user equipment - Google Patents
A kind of user equipment access method and user equipment Download PDFInfo
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Abstract
The invention discloses the cut-in methods of user equipment (UE) a kind of, comprising: determines the initial value of Backoff timer；Determine the UE resource block to be occupied (RB) number；The RB number to be occupied according to UE determines rollback step-length of the UE in time-domain, monitor the RB number of present channel free time, when the idle RB number monitored is greater than or equal to the UE RB number to be occupied, the numerical value of the Backoff timer is reduced by a rollback step-length, repeats this step until the Backoff timer is reset；And send data.The corresponding above method, the invention also discloses the internal structures of UE.
Description
Technical field
This application involves mobile communication technology fields, in particular to a kind of user equipment (UE) access in cellular networks
Method and UE.
Background technique
Traditional cellular network is the system based on scheduling.In traditional cellular network, when UE has data to send out
When sending, UE needs elder generation Xiang Jizhan (eNB) to send a scheduling request；After eNB receives the scheduling request, uplink is distributed for the UE and is passed
Defeated resource, and the resource for notifying the UE to be distributed by dedicated control channel (PDCCH).UE is in the notice for obtaining resource allocation
Later, data could be sent.Above-mentioned transmission scheduling request-distribution resource-notice resource allocation result interactive process causes
The access delay of UE at least needs 11 milliseconds in system based on scheduling, and can not further decrease.When the access grown in this way
Prolong be in traditional cellular network the system that can satisfy requirement.However, with the emergence of new business, based on tune
The access delay of the access mechanism of degree is longer and will be more and more obvious the problem of can not reducing.For example, from the angle of business
From the point of view of, following cloud business will largely carry out, the extra process bring processing delay in cloud and the propagation delay time of data
Increase will lead to user will be more sensitive to time delay end to end.In this case, if can reduce in cellular network
The access delay of UE then can largely make up the processing delay of equipment and the propagation delay time of data.Therefore, how
The access delay for reducing UE in cellular network has become a current important research topic.
Summary of the invention
The invention discloses a kind of UE access methods, to reduce the access delay of UE.
The cut-in method of UE described in the embodiment of the present invention, comprising: determine the initial value of Backoff timer；Determine that UE will be occupied
Resource block RB number；The RB number to be occupied according to UE determines rollback step-length of the UE in time-domain, monitors idle on present channel
RB number, when the idle RB number monitored is greater than or equal to the UE RB number to be occupied, by the number of the Backoff timer
Value reduces by a rollback step-length, repeats this step until the Backoff timer is reset；And send data.
Wherein it is determined that the initial value of Backoff timer comprises determining that the size CW of competition window；Determine that UE is needed in time-domain
The timeslot number a of upper rollback, and a is set by the initial value of Backoff timer；Wherein, a is that a value is random between 1 and CW
Number.
Wherein it is determined that the size CW of competition window includes: base station monitoring cell internal loading；When base station finds cell internal loading
UE number when weight, in base station broadcast current area；When base station discovery cell internal loading is not heavy, the current system benefit of base station broadcast
With rate；And when receiving the UE number in current area, UE is that saturation state determines contention window value according to system；When receiving
When system availability, UE is that unsaturated state determines contention window value according to system.
The resource block RB number for determining that UE to be occupied includes: to differentiate to the chain-circuit time delay of the UE, determines the chain of the UE
The value of the UE RB number variable the to be occupied when derivative of road time delay is zero, using the value as the UE RB number to be occupied.
The chain-circuit time delay of UE is calculated by following formula: DelayUE=Tbackoff+Ttransmission, wherein Tbackoff
For rollback time delay；TtransmissionFor propagation delay time.
Rollback time delay TbackofF is calculated by following formula:Wherein, RB_
Total_idle is the idle RB sum monitored；RB_selected is the UE RB number to be occupied；Slot is exactly a time slot
Time.
Rollback time delay TbackoffIt is calculated by following formula:Wherein, RB_
Total_idle is the idle RB sum monitored；RB_selected is the UE RB number to be occupied；Slot is exactly a time slot
Time.
Propagation delay time TtransmissionIt is calculated by following formula:Wherein,
Transmission_size be in queue the length of the total length of all packets or maximum transmission unit either maximum transmitted when
Between the transmission packet size converted；M is the transmission rate of the single RB determined by selected code modulation mode.
The RB number to be occupied according to UE determine rollback step-length of the UE in time-domain include: the rollback step-length be monitor
Idle RB sum and the UE RB number to be occupied quotient be rounded after numerical value.
Wherein, sending data includes: the resource block number to be occupied according to UE, selects UE from current available free RB
The resource block of occupancy, and data are sent with the resource block that selected UE is occupied.
The above method further comprises: after determining the size CW of competition window, UE sends detection with reference to letter to base station
Number SRS；Base station carries out the judgement of channel relevancy between UE according to the SRS that UE is reported, and sends contention window adjustment instruction to UE；UE
Instruction Competition adjustment window size is adjusted according to contention window.
The embodiment of the present invention also proposed a kind of UE, comprising:
Backoff timer initialization unit, for determining the initial value of Backoff timer；
Resource block RB number determination unit, the resource block RB number to be occupied for determining UE；
Rollback unit, the RB number for be occupied according to UE determine rollback step-length of the UE in time-domain, monitor current letter
The RB number of road free time, when the idle RB number monitored is greater than or equal to the UE RB number to be occupied, by the Backoff timer
Numerical value reduce a rollback step-length, repeat this step until the Backoff timer reset；And
Data transmission unit, for sending data.
Particularly, the embodiments of the present invention also provide a kind of competition window methods of adjustment, comprising: base station monitors in cell
Load；UE number when base station discovery cell internal loading weight, in base station broadcast current area；When base station finds cell internal loading not
When weight, the current system availability of base station broadcast；And when receiving the UE number in current area, UE is saturation according to system
State determines contention window value；When receiving system availability, UE is that unsaturated state determines contention window value according to system.
The structure of process and UE from above-mentioned UE access method can be seen that UE can according to the RB number that UE to be occupied with
And the step-length that idle RB number dynamic adjustment UE retracts in time-domain on the present channel detected, so that UE is occupied at itself
RB number it is less and/or idle RB number it is more when rollback in time-domain can be rapidly completed, reduce access delay, realize UE
Quickly access.
Detailed description of the invention
Fig. 1 is UE access method flow diagram described in one embodiment of the invention；
The process schematic of Fig. 2 multiple UE competitive channels when being using UE access method as shown in Figure 1；
Fig. 3 is the signaling process figure of UE access method described in one embodiment of the invention；
Fig. 4 is UE access method flow diagram described in another embodiment of the present invention；And
Fig. 5 is UE schematic diagram of internal structure described in one embodiment of the invention.
Specific embodiment
As previously mentioned, time delay will be more sensitive end to end to new business by user with the appearance of new business, because
This, can largely make up the processing delay of equipment and the transmission of data if the access delay that can reduce UE
Time delay.
In addition, from the point of view of the topological structure of network, in future in order to expand power system capacity, more and more small cells
(small cell) can be added under original macro base station.Under this topological structure, the corresponding micro-base station of each cell
Under UE number can be far smaller than original macro base station.If introducing the UE access scheme based on competition (CB) in micro-base station side,
Mutual competitions and conflicts can't be too obvious.
From the aspect of above two, the invention proposes UE access method competition-based is introduced in cell.Thing
In reality, UE access mechanism competition-based is a kind of access mechanism being widely used, at present wireless lan (wlan) system
It is namely based on competition mechanism.However, since WLAN and long evolving system (LTE) have larger difference on a physical layer,
Good effect directly can not be obtained using existing UE access mechanism competition-based in LTE.Specifically, LTE and
The maximum difference of WLAN on a physical layer is that the subcarrier width of WLAN is 312.5kHz, corresponding orthogonal frequency division multiplexing
(OFDM) symbol lengths are 4 microseconds (μ s)；And the subcarrier width of LTE only has 15kHz, corresponding OFDM symbol length is 71
μs.In the contention system based on time slot (slot), the length of a slot should at least be greater than the length of an OFDM symbol.
In a wlan, it is contemplated that uplink and downlink conversion, the length of a slot are 9 μ s.So in LTE system, a slot is at least
It to be 71 μ s.So long slot value can make idle time delay when competition and the cost after conflict all become very large, this is
Through becoming the greatest problem introduced competition mechanism in LTE.
In order to solve this problem, the invention proposes a kind of UE access methods, by improving the rollback in time-domain
(backoff) speed come solve in LTE system as slot length it is too long caused by compete when idle time delay and conflict after
The problem of cost all becomes very large.
In one embodiment of the invention, it is mainly in view of the orthogonal frequency access characteristic of LTE/LTE-A, passes through increase
Rollback in frequency is come the problem of making up rollback overlong time in time-domain.Those skilled in the art it is known that, in WLAN
In system, UE once obtains the chance for occupying channel, it will whole bandwidth is occupied, and in an embodiment of the present invention, for reality
Rollback in existing frequency, UE can determine the number of sub carrier wave that itself is occupied according to the demand of itself first.Hereinafter, in order to retouch
It is convenient for when stating and LTE system is unified, replaces above-mentioned subcarrier with resource block (RB).That is, in an embodiment of the present invention, UE
The RB number itself occupied can be determined according to the demand of itself.UE can will only occupy the RB number of itself needs after competing successfully.?
In the present invention, this mode is known as to the rollback of frequency domain.Particularly, the UE RB number to be occupied is fewer, is considered as it in frequency
Rollback on domain is bigger；The UE RB number to be occupied is more, and it is smaller to be considered as its rollback in frequency domain.So correspondingly, if
Rollback of the UE in frequency domain is bigger, and the rollback in time-domain can be faster；And if rollback of the UE in frequency domain is got over
Small, the rollback in time-domain just should be slower.That is, if the UE RB number to be occupied is fewer, so that it may more increase the UE
Rollback step-length in time-domain, allows UE that the rollback in time-domain is more rapidly completed；And if the UE RB number to be occupied
It is more, rollback step-length of the UE in time-domain just should be more reduced, allows returning on the deadline domain of UE more at a slow speed
It moves back.Particularly, when UE selects to occupy whole bandwidth, then it is assumed that its frequency domain without back-off, then the UE is in time-domain
Rollback step-length just as traditional WLAN, it is constant to remain 1.
Below in conjunction with attached drawing detailed description of the present invention embodiment.
Fig. 1 is UE access method flow diagram described in one embodiment of the invention.As shown in Figure 1, described in the present embodiment
Cut-in method specifically includes that
Step 101: the initial value of Backoff timer is set.
Specifically, this step can be achieved by the steps of:
Step 1: determining the size CW of competition window.
According to the WLAN protocol actually used at present, the size of competition window is defaulted as being 31 slot.Therefore, at this
In embodiment, above-mentioned CW can be any predetermined fixed numbers, such as 31 slot.
Step 2: determining the timeslot number a that UE needs to retract in time-domain, and a is set by the initial value of Backoff timer.
In this step, UE can generate a random number a, the value of the random number is between 1 and CW before giving out a contract for a project.
Known UE will continuously monitor channel under existing UE access mechanism competition-based, in the accumulative sky of discovery channel
After a slot, the data packet of itself can be just sent.
Step 102: determining the UE RB number to be occupied.
In this step, the UE RB number to be occupied will directly influence the waiting time delay and propagation delay time of data packet.For example,
If the UE RB number to be occupied is more, the waiting time delay of data packet will increase, and its propagation delay time will reduce；And if UE is wanted
The RB number of occupancy is less, then the waiting time delay of data packet will reduce, and its propagation delay time will increase.Therefore, in this step, may be used
It is minimum with the entire chain-circuit time delay for selecting the value of a RB number to make the data packet, even entering media access control from data packet
System (MAC) queue starts, and the entire time delay until base station receives this data packet is minimum.In other words, of the invention one
In a embodiment the UE RB number to be occupied will be determined to optimize chain-circuit time delay as final goal.It should be noted that above-mentioned excellent
Changing target is to determine that a specific embodiment of the UE RB number to be occupied can also be according to practical system in actual application
The demand of system selects other optimization aims to determine RB number that UE to be occupied.
Below RB number that UE to be occupied how will be determined by a specific example detailed description.
In this example, the chain-circuit time delay of UE is mainly made of following three parts namely the chain-circuit time delay Dela of UEyUEIt can be with
It is calculated by following formula (1):
DelayUE=Tbackoff+Ttransmission+Tfrozen(1)
Wherein, TbackoffFor rollback time delay, when UE listens to channel idle, his Backoff timer can subtract a step
Long value.Rollback time delay TbackoffExactly from starting to retract, arriving Backoff timer is the time required for 0.TfrozenFor rollback timing
Device freezes time delay, and when UE, which listens to other UE, occupies channel, it can freeze the Backoff timer of oneself.Backoff timer freezes
Tie time delay TfrozenIt is exactly the total duration that Backoff timer freezes.TtransmissionIt is that UE sends this data packet for propagation delay time
The time of this data packet is received to base station.
Wherein, rollback time delay TbackoffIt can calculate, can also be calculated according to real-time rollback time delay according to mean value.
If according to mean value computation, shown in following formula (2):
If being calculated according to real-time rollback time delay, shown in following formula (3):
Wherein, the random number of (1, CW) a=random, i.e. a for its value between 1 and CW；Wherein, RB_total_idle
It is the idle RB sum monitored；RB_selected is the UE RB number to be occupied；Slot is exactly the time of a time slot, in LTE
71 μ s can be taken in system.
In addition, propagation delay time TtransmissionIt can be calculated by following formula (4):
Wherein, Transmission_size depends on specific transmission plan, and value can be the total of all packets in queue
Length is also possible to the length of maximum transmission unit, the maximum transmission unit (MTU) being similarly in WLAN, or maximum
Transmission time (similar to the competition stream transmission opportunity (TxOP) in WLAN) converts the transmission packet size etc. to come；M is by selecting
The transmission rate for the single RB that fixed code modulation mode is determined.For example, LTE in the case where single antenna, has selected 64QAM
When with 3/4 code rate, the transmission rate m of single RB is just 0.76Mbps.
When RB_selected is less than RB_total_idle, timer will retract according to a particular step size, therefore
It will freeze time delay T in the present embodimentfrozenIt is denoted as 0, namely Delay in this caseUE=Tbackoff+Ttransmission。
It based on above description, finds after study, reduces this convex optimization problem of chain-circuit time delay, in fact only RB_
Such a variable of selected.The optimal solution of one univariate convex optimization problem, it is only necessary to the chain-circuit time delay of UE
DelayUEDifferentiating can be obtained.
It therefore, in this step, can be first to DelayUEIt differentiates, determination enables DelayUERB_ of derivative when being zero
The value of selected, using the value as the UE RB number to be occupied.
Step 103: the RB number to be occupied according to UE determines rollback step-length of the UE in time-domain.
In this step, rollback step-length step of the UE in time-domain can be determined by following formula (5).It needs
Bright, rollback step-length of the UE in time-domain should be the numerical value after being rounded to following formula (5) calculated result.
After the RB number that UE is occupied has been determined, so that it may initially enter the stage of competitive channel.
Step 104: the RB number of monitoring present channel free time will be accounted for when the idle RB number monitored is greater than or equal to UE
The numerical value of Backoff timer is reduced by a rollback step-length, then return step 103 by RB number, until Backoff timer is
Zero.Step 105 is executed when Backoff timer is reset；And step 103 is returned to when Backoff timer is not reset.
In this step, if rollback step-length is greater than the current value of Backoff timer, directly Backoff timer is reset.
Step 105: sending data.
In this step, when Backoff timer is zero, UE can select RB_ from instantly available free RB
Selected RB sends data.Specifically, UE can be using the scheme selected at random, it can also be according to pre-specified
Criterion select, such as select the best RB etc. of performance.
It is described in detail below by a specific example under above-mentioned UE access mechanism competition-based, multiple UE are
How co-ordination.Assuming that there is 3 UE in cell, total RB number of system is 10.It is assumed that competition window optimal value is CW
It is 7.Based on this contention window value, the random back timeslot number that UE A is generated is 6；UE B generate random back timeslot number be
4；The random back timeslot number that UE C is generated is 5.Next, situations such as each UE is according still further to itself business, according to retouching above
The method stated calculates the RB number of oneself needs.In the example, it is assumed that UE A, which is once sent, needs to occupy 5 RB, UE B is primary
Transmission needs to occupy 3 RB, and UE C, which is once sent, needs to occupy 1 RB.Assuming that this 3 UE start simultaneously at rollback, then they
The process of competitive channel will be as shown in Figure 2.
As shown in Fig. 2, 3 UE start simultaneously at rollback in slot0.They all detect there are 10 on channel at the beginning respectively
RB is idle.Since the UE C RB number occupied is 1, so the rollback step-length of UE C is 10；And its random back timeslot number
It is 5, as soon as so only passing through a slot, the fallback counter of UE C becomes 0.Then, UE C may be selected by one in slot1
A RB sends data.And for UE A and UE B, since the RB number itself occupied that they are determined is bigger, so they are also
It has to continue waiting for fallback counter clearing.Also 9 RB free time are listened in slot1, UE B, and the RB number occupied certainly is
3, so, the rollback step-length of UEB is just 3.Similarly, the rollback step-length of UE A is 1.As shown in Fig. 2, in each slot, each UE
The rollback step-length of oneself will be adjusted according to the idle RB number monitored and the RB number itself occupied.Until returning for itself
Counter O reset is moved back, then selection RB sends data from idle RB.
It, can be according to idle on the RB number that UE to be occupied and the present channel detected in above-mentioned UE access method
The step-length that RB number dynamic adjustment UE retracts in time-domain, so that RB number UE less and/or idle in the RB number itself occupied
The rollback in time-domain can be rapidly completed when more, reduce access delay, realize quickly accessing for UE.
It should be noted that contention access can also be based further in the first step of the step 101 of above-described embodiment
The access delay mathematical model of system optimizes the size CW of competition window.Currently, being directed to the access of contention access system
Time delay mathematics model analysis is relatively mature: one is the access delay analyses under saturation state；Another is unsaturation
Access delay analysis under state.So-called saturation state, that is, assume each UE, at every moment there is infinite Bao Yaofa.Rather than
The analysis of saturation state generates data packet according to real business model, and meets the portfolio of all UE in cell (also referred to as
Be cell load) be less than whole system saturation throughput hypothesis.According to the analysis of mathematical model as a result, in saturation state
Under, UE number is to influence the key factor of optimal contention window value.And under unsaturated state, cell load and UE number are all shadows
The key factor of optimal contention window value is rung, and the influence for the cell load that compares is even more important.
Based on to the synthesis recognized above, the embodiment of the present invention proposes a kind of method of adjustment of competition window, Ke Yiying
In the first step for above-mentioned steps 101, for determining the size of competition window.This method specifically comprises the following steps:
Firstly, base station (small-cell base station) monitors cell internal loading；When base station discovery cell internal loading weight (for example, being
When utilization rate of uniting is greater than or equal to 0.7), the UE number in base station broadcast current area；And when base station discovery cell internal loading does not weigh
When (for example, when system availability is less than 0.7), the current system availability of base station broadcast (load/saturation throughput) ρ.When connecing
When receiving the UE number in current area, UE is that saturation state determines contention window value according to system；When receiving system availability ρ
When, UE is that unsaturated state determines contention window value according to system.
Specifically, it is considered that small when cell internal loading is heavier (for example, when system availability is greater than or equal to 0.7)
The traffic models of user are similar to full-buffer model in area.So then it can carry out optimal CW's with following formula (6)
It calculates:
Wherein,pcollision=1- (1-psend)N-1,N is indicated in cell
Number of users, MTU indicate maximum transmission unit, Data_rate is the transmission rate of system.
And when cell internal loading is lighter (for example, when system availability is less than 0.7), it is necessary to according to the specific industry of user
Model be engaged in calculate optimal CW.In the present embodiment, the relationship that can use access delay and CW is derived, and is obtained optimal
CW value.It is found by simulating, verifying, when cell internal loading is heavier, using this method, will lead to what mathematical analysis obtained
Optimal CW and the obtained optimal CW deviation of emulation are larger.Therefore, this method only is used when cell internal loading is lighter.Such as
Lower formula (7) gives the access delay d of user iiWith the relationship of competition window:
Wherein, N indicates number of users, and C indicates that the service speed (i.e. the transmission rate of physical layer) of system, P indicate maximum
The size of transmission unit, ρ indicates the peak use rate of system when saturated, and (this value is related with CW, can be in full-buffer
Obtained under assumed condition), ωiWithRespectively indicate the first order and second order moments of data package size distribution.The mesh of the present embodiment
Be to find the smallest CW setting of average access delay, therefore according to diObtain average access delay as shown in formula.
There was only mono- variable of CW due to minimizing average this optimization problem of access delay, formula (8) need to only be asked
It leads, and enabling the expression formula after derivation is 0, can calculate optimal CW value.
The embodiment of the present invention gives the signaling process using the above method, as shown in Figure 3.
In step 301, UE sends random access lead code (preamble) to base station (such as micro-base station)；
In step 302, base station sends instruction to UE and is timed adjustment；
Above-mentioned steps 301 and 302 can be with reference to the UE synchronization mechanism in LTE system.
In step 303, base station sends system information block, number and system availability including UE in its cell etc. to UE
Information；
In step 304, UE determines contention window value CW according to the system information block that base station is sent；
In step 305, UE determines the RB number itself to be occupied and rollback step-length, and monitor channel, is listening to the free time
It when RB number is greater than the RB number itself to be occupied, retracts, until the value of fallback counter is zero；
In the RB that step 306, UE select itself to occupy in idle RB；
In step 307, UE sends data.
In above-mentioned process, when channel relevancy is higher, in the RB for selecting itself to occupy, if the criterion of UE is choosing
The best RB of performance is selected, then between the high UE of correlation, it is likely that conflict can be easy to happen.
It in order to solve this problem, can be after above-mentioned steps 304 determine contention window value CW, further from UE to base
It stands and sends detection reference signal (SRS), such base station can carry out the judgement of channel relevancy between UE according to the SRS that UE is reported,
And contention window adjustment instruction further is sent to UE, then UE can adjust instruction Competition adjustment window size according to contention window.
For example, by increasing contention window when the channel relevancy between UE is larger, to avoid the excessively high problem that conflicts.
From above-mentioned competition window method of adjustment can be seen that in the method for the invention can according to the UE number in cell with
And the portfolio of UE optimizes the size CW of competition window, so that the UE number in cell is more and/or the portfolio of UE
Increase the size of contention window when heavier, suitably to reduce the probability of competition collision；And UE number in cell it is less and/or
Reduce the size of contention window when the portfolio of UE is lighter, suitably to reduce the access delay of UE.
It should be noted that the method for adjustment of above-mentioned this competition window can also be applied directly to existing based on competing
In the UE access method striven, the access delay of UE can also be reduced.Another embodiment of the present invention gives a kind of such UE and connects
Enter method, detailed process is as shown in Figure 4.This method mainly includes the following steps:
Step 401: the size CW of competition window is determined according to the load of cell.
Step 402: determining the timeslot number a that UE needs to retract in time-domain.
In this step, UE can generate a random number a, the value of the random number is between 1 and CW before giving out a contract for a project.
Step 403: monitoring channel sends the data packet of itself after listening to a time slot of channel accumulative sky.
According to above-mentioned UE access method, the embodiment of the present invention also discloses a kind of UE, and structure is as shown in figure 5, main
Include:
Backoff timer initialization unit 501, for determining Backoff timer initial value；Specifically, Backoff timer
Initialization unit 501 can determine the size CW of competition window first, determine the timeslot number a that UE needs to retract in time-domain,
And a is set by the initial value of Backoff timer；Wherein, a is random number of the value between 1 and CW；
RB number determination unit 502, the resource block RB number to be occupied for determining UE；
Rollback unit 503, the RB number for be occupied according to UE determine rollback step-length of the UE in time-domain, and monitoring is current
The RB number of channel idle, when the idle RB number monitored is greater than or equal to the UE RB number to be occupied, by the rollback timing
The numerical value of device reduces by a rollback step-length, repeats this step until the Backoff timer is reset；And
Data transmission unit 504, for sending data.
Further above-mentioned Backoff timer initialization unit 501 can be determined according to the adjusting method of above-mentioned competition window
The size CW of competition window.
Resource block RB number determination unit 502 can determine the UE resource block RB number to be occupied according to above-mentioned steps 103.
Rollback unit 503 can carry out the rollback in time-domain according to above-mentioned steps 104 and 105, until the rollback is counted
When device reset.
As previously mentioned, above-mentioned UE can be according to RB idle on the RB number that itself to be occupied and the present channel detected
The step-length that number dynamic adjustment UE retracts in time-domain, so that more in the less and/or idle RB number of the RB number that itself is occupied
When rollback in time-domain can be rapidly completed, reduce access delay, realize quickly accessing for UE.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (13)
1. a kind of cut-in method of user equipment (UE) characterized by comprising
Determine the initial value of Backoff timer；
Determine the UE resource block RB number to be occupied；
The RB number to be occupied according to UE determines rollback step-length of the UE in time-domain, monitors RB number idle on present channel, when
When the idle RB number monitored is greater than or equal to the UE RB number to be occupied, the numerical value of the Backoff timer is reduced one
Rollback step-length repeats this step until the Backoff timer is reset；And
Send data.
2. the cut-in method of UE according to claim 1, which is characterized in that the initial value packet of the determining Backoff timer
It includes:
Determine the size CW of competition window；
It determines the timeslot number a that UE needs to retract in time-domain, and sets a for the initial value of Backoff timer；Wherein, a mono-
Random number of a value between 1 and CW.
3. the cut-in method of UE according to claim 2, which is characterized in that the size CW packet of the determining competition window
It includes:
Base station monitors cell internal loading；
UE number when base station discovery cell internal loading weight, in base station broadcast current area；When base station finds cell internal loading not
When weight, the current system availability of base station broadcast；And
When receiving the UE number in current area, UE is that saturation state determines contention window value according to system；
When receiving system availability, UE is that unsaturated state determines contention window value according to system.
4. the cut-in method of UE according to claim 1, which is characterized in that the determining UE resource block RB number to be occupied
It include: to differentiate to the chain-circuit time delay of the UE, the UE RB number the to be occupied when derivative for determining the chain-circuit time delay of the UE is zero
The value of variable, using the value as the UE RB number to be occupied.
5. the cut-in method of UE according to claim 4, which is characterized in that the chain-circuit time delay of the UE passes through following formula
It is calculated:
DelayUE=Tbackoff+Ttransmission
Wherein, TbackoffFor rollback time delay；TtransmissionFor propagation delay time.
6. the cut-in method of UE according to claim 5, which is characterized in that the rollback time delay TbackoffBy following public
Formula is calculated:
Wherein, CW is the size of competition window, and RB_total_idle is the idle RB sum monitored；RB_selected is UE
The RB number to be occupied；Slot is exactly the time of a time slot.
7. the cut-in method of UE according to claim 5, which is characterized in that the rollback time delay TbackoffBy following public
Formula is calculated:
Wherein, a is the initial value of the Backoff timer, and RB_total_idle is the idle RB sum monitored；RB_
Selected is the UE RB number to be occupied；Slot is exactly the time of a time slot.
8. the cut-in method of UE according to claim 5, which is characterized in that the propagation delay time TtransmissionBy such as
Lower formula is calculated:
Wherein, Transmissio_n size is that the length of the total length of all packets or maximum transmission unit is either in queue
Maximum transmission time converts the transmission packet size to come；RB_selected is the UE RB number to be occupied；M is by selected coding
The transmission rate for the single RB that modulation system is determined.
9. the cut-in method of UE according to claim 1, which is characterized in that the RB number to be occupied according to UE determines UE
Rollback step-length in time-domain includes: that the rollback step-length is the idle RB sum monitored and the quotient of the UE RB number to be occupied
Numerical value after rounding.
10. the cut-in method of UE according to claim 1, which is characterized in that the transmission data include: to be accounted for according to UE
Resource block number selects the resource block that UE is occupied, and the money occupied with selected UE from current available free RB
Source block sends data.
11. the cut-in method of UE according to claim 2, which is characterized in that further comprise: determining competition window
After size CW, UE sends detection reference signal SRS to base station；The SRS that base station is reported according to UE carries out channel relevancy between UE
Judgement, and to UE send contention window adjustment instruction；UE adjusts instruction Competition adjustment window size according to contention window.
12. the cut-in method of UE according to claim 2, which is characterized in that the size CW packet of the determining competition window
It includes:
Base station monitors cell internal loading；
UE number when base station discovery cell internal loading weight, in base station broadcast current area；When base station finds cell internal loading not
When weight, the current system availability of base station broadcast；And
When receiving the UE number in the current area, UE is according to the size CW that system is that saturation state determines competition window；
When receiving the system availability, UE is according to the size CW that system is that unsaturated state determines competition window.
13. a kind of user equipment (UE) characterized by comprising
Backoff timer initialization unit, for determining the initial value of Backoff timer；
Resource block RB number determination unit, the resource block RB number to be occupied for determining UE；
Rollback unit, the RB number for be occupied according to UE determine rollback step-length of the UE in time-domain, and monitoring present channel is empty
Not busy RB number, when the idle RB number monitored is greater than or equal to the UE RB number to be occupied, by the number of the Backoff timer
Value reduces by a rollback step-length, repeats this step until the Backoff timer is reset；And
Data transmission unit, for sending data.
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| JP2014222942A JP6437273B2 (en) | 2013-11-06 | 2014-10-31 | User device access method, user device |
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| WO2016186406A1 (en) * | 2015-05-16 | 2016-11-24 | 주식회사 윌러스표준기술연구소 | Method, device, and system for signal transmission in unlicensed band |
| CN106559907A (en) * | 2015-09-24 | 2017-04-05 | 株式会社Ntt都科摩 | Determine method, wireless base station and the mobile station of contention window size |
| US11184926B2 (en) | 2016-08-12 | 2021-11-23 | Telefonaktiebolaget Lm Ericsson (Publ) | LBT parameters for SRS transmission |
| CN109257794B (en) * | 2017-07-13 | 2021-06-01 | 华为技术有限公司 | Random access method and equipment |
| CN110719649B (en) * | 2018-07-12 | 2023-02-10 | 华为技术有限公司 | Channel access method and device |
| CN112188545B (en) * | 2019-07-02 | 2022-12-09 | 中国移动通信集团山东有限公司 | Access control method, device, storage medium and base station |
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| CN101316134A (en) * | 2007-05-31 | 2008-12-03 | 大唐移动通信设备有限公司 | Accidental access method and corresponding terminal and base station adopting the same |
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| JP6437273B2 (en) | 2018-12-12 |
| CN104640230A (en) | 2015-05-20 |
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