CN109379729A - A kind of QoS assurance in D2D system - Google Patents
A kind of QoS assurance in D2D system Download PDFInfo
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- CN109379729A CN109379729A CN201811428860.XA CN201811428860A CN109379729A CN 109379729 A CN109379729 A CN 109379729A CN 201811428860 A CN201811428860 A CN 201811428860A CN 109379729 A CN109379729 A CN 109379729A
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- cluster
- qos
- moved out
- unlicensed band
- free frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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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
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to the QoS assurances in a kind of D2D system comprising: step S1: establishing D2D cluster, and operates in it in current unlicensed band；Step S2: cluster head listens to the QoS state of D2D cluster in current unlicensed band；Step S3: by cluster head according to the actual speed rate of local channel quality and D2D link, determine that the QoS of current unlicensed band is satisfied with the factor；Step S4: when the QoS of the current unlicensed band is satisfied with the factor less than preset QoS happy bit, reduce the scale of member in D2D cluster by the cluster head, and the QoS state report that the information about firms comprising being moved out of D2D cluster and the QoS comprising the current unlicensed band are satisfied with the factor is sent jointly to by base station by the cluster head；Step S5 is moved out of the member of D2D cluster by the base station by cellular signaling link notice.The present invention listens to licensing free frequency band D2D cluster QoS state by cluster head, if current licensing free frequency band not can guarantee QoS, the cluster scale for adjusting current licensing free frequency band consciously is carried out guaranteed qos.
Description
Technical field
A kind of QoS assurance in wireless communication technology field of the present invention more particularly to D2D system.
Background technique
The direct-connected and direct cooperation enforcement technology of wireless cellular system mobile device, such as device-to-device (Device-to-
Device, D2D) it communicates and has reached extensive common recognition as the important feature of future 3GPP LTE/LTE-A system.As enhancing
The component part (underlay) of long term evolution (Long Term Evolution-Advanced, LTE-A) system, D2D communication
Integrated cellular network can obtain higher frequency spectrum efficiency or provide new services.Utilize D2D technology, user terminal (User
Equipments, UE) base station (eNodeB, eNB) control under can pass through D2D link direct communication.(ratio in some scenarios
As carried out data sharing between adjacent several UE), multiple UE are connected to each other, composition D2D cluster communication.
In conventional manner, D2D communication uses cellular bandwidth, and D2D link is orthogonal with cellular link to use authorization resources.So
And when system is busy or network load weight, authorized cellular frequency band is likely difficult to sufficiently support all UE communications.At this
Under part, D2D communication is supported using licensing free frequency band as optional resource, for example, to avoid authorized frequency bands flow congestion, eNB order
D2D cluster is transformed into licensing free frequency band and is communicated.As shown in Figure 1, D2D cluster (Cluster) interior UE passes through licensing free frequency band
(Unlicensed band) is communicated, while maintaining the cellular link of authorized frequency bands (Licensed band), with eNB phase
Even.
There is document to propose that D2D communication using licensing free frequency band, carries out the transmission of D2D data in licensing free frequency band, by authorization frequency
With the scheme for carrying out signaling control.However, the document only suggests using licensing free frequency band, does not provide but and how to exempt from authorization frequency
Take the method for ensureing D2D telecommunication service quality.
Most intuitive method is to communicate according further to interference strength and channel quality in eNB Real-Time Scheduling, such as cluster by eNB
Scheduling is realized.In this method, because eNB is that transmission selects correct modulating-coding format every time, suitable money can be dispatched
Source block, and then ensure service quality (Quality of Service, QoS).However, this central controlled QoS Support Mode
It is required that real-time Transmission interference strength and channel quality information, will bring a large amount of signaling overheadss to cellular link.
Different from authorized frequency bands, various communications applications are can be realized without authorization in licensing free frequency band.Therefore, exempt from authorization communication
It must tolerate the interference from other equipment.In order to achieve this, licensing free frequency band usually have it is more tightened up than authorized frequency bands
Transmission power and with external leakage requirement.Further, since there is chance to use feature for unpredictable periphery interference, licensing free frequency band.
Therefore, although D2D cluster member's spacing is short, to carry out D2D communication, licensing free frequency band on licensing free frequency band
Unpredictable interference still will affect telecommunication service quality.
Furthermore with the movement of member in cluster, channel quality can also change in cluster, when cluster scale is constant, if
D2D carries out cluster communication using authorization resources are exempted from, once member is mobile in cluster, it is possible to it not can guarantee QoS.
For synthesis, once cluster communication is transformed into licensing free frequency band, the interference and cluster member movement of licensing free frequency band will be broken
Bad D2D communicates QoS.However, before cluster is transformed into licensing free frequency band, the D2D communication work of honeycomb control on authorized frequency bands,
ENB can ensure that D2D communicates QoS by scheduling.Therefore, after cluster communication is transformed into licensing free frequency band, continuation is protected by eNB
QoS is held highly to study.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, the present invention is intended to provide the QoS indemnifying party in a kind of D2D system
Method, to realize that D2D communication QoS is ensured on licensing free frequency band.
QoS assurance in a kind of D2D system of the present invention comprising following steps:
Step S1: establishing D2D cluster, and operates in it in current unlicensed band；
Step S2: the QoS state of D2D cluster in current unlicensed band is listened to by the cluster head in the D2D cluster；
Step S3: by the cluster head according to the actual speed rate of local channel quality and D2D link, determination currently exempts to authorize
The QoS of frequency range is satisfied with the factor；
Step S4: when the QoS of the current unlicensed band is satisfied with the factor less than preset QoS happy bit, pass through
The cluster head reduces the scale of member in D2D cluster, and passes through the cluster head for information about firms and packet comprising being moved out of D2D cluster
The QoS state report that QoS containing the current unlicensed band is satisfied with the factor sends jointly to base station；
Step S5 is moved out of the member of D2D cluster by the base station by cellular signaling link notice.
In the QoS assurance in above-mentioned D2D system, the preset QoS happy bit is 1 bit.
In the QoS assurance in above-mentioned D2D system, in the step S4, the cluster head is based in D2D cluster originally
Ground channel quality determines the information about firms for being moved out of D2D cluster.
In the QoS assurance in above-mentioned D2D system, the QoS state report further include: simplified QoS category
Know, ensure details parameter sets, Maximum Bit Rate, largest packet error rate and the data priority of bit rate.
In the QoS assurance in above-mentioned D2D system, the step S5 further include: select any one following side
Formula processing is moved out of the member of D2D cluster:
1) member for being moved out of D2D cluster is converted back the cellular signaling link of authorization by base station, to make to be moved out of D2D cluster
Member executes according to base station scheduling and communicates with interior D2D；
2) base station requires the member for being moved out of D2D cluster to listen to other licensing free frequency bands, and uses other licensing free frequency band groups
The licensing free frequency band D2D cluster of Cheng Xin.
Due to using above-mentioned technical solution, the present invention listens to licensing free frequency band D2D cluster QoS shape by cluster head
State protects the cluster scale for adjusting current licensing free frequency band consciously if it find that current licensing free frequency band not can guarantee QoS
Demonstrate,prove QoS.The present invention can be used for it is various exempt to authorize in cluster operation, while being also applied for 230 frequency range wireless power communication systems, and
And even if media competition-based intervention control (Media Access Control, MAC) agreement, can also be realized using the present invention
QoS is ensured.Specifically, advantages of the present invention is as follows:
1, controlling by eNB can be achieved QoS guarantee in licensing free frequency band cluster, and the signaling overheads is negligible.QoS guarantee can lead to
It crosses and part UE is converted back into cellular band or requires certain cluster UE using newly authorization resources are exempted to realize.
2, the Signalling Designing of licensing free frequency band cluster communication QoS guarantee is simplified.
3, application range is increased.It is proposed that QoS guarantee mechanism can be used for it is all exempt from authorize clusters operation, even if base
It can also be used in the authorization cluster of exempting from of the MAC protocol of competition.
4, when the licensing free frequency band of eNB configuration is not able to satisfy qos requirement, remaining cluster member is had little influence on, it is remaining
Cluster member UE continues to keep origin operation mode, without changing centre frequency, band filter and transmission power etc..
Detailed description of the invention
Fig. 1 is the cluster communication scheme that work is controlled in the honeycomb of licensing free frequency band；
Fig. 2 is the flow chart of the QoS assurance in a kind of D2D system of the present invention；
Fig. 3 a-c is the schematic diagram for the different-format that QoS state is reported in the present invention respectively.
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 Fig. 2, of the invention, i.e., the QoS assurance in a kind of D2D system, comprising the following steps:
Step S1: establishing D2D cluster, and operates in it in current unlicensed band；
Step S2: the QoS state of D2D cluster in current unlicensed band is listened to (that is, cluster head is held by the cluster head in D2D cluster
Row local QoS is monitored)；
Step S3: by cluster head according to the actual speed rate of local channel quality and D2D link, current unlicensed band is determined
QoS be satisfied with the factor；
Step S4: ratio is satisfied with less than preset QoS when the QoS of the current unlicensed band determined in step S3 is satisfied with the factor
When special (that is, if the QoS of current unlicensed band cannot be protected), reduce the scale of member (UE) in D2D cluster by cluster head
To guarantee the QoS of D2D communication, and by cluster head by the information about firms comprising being moved out of D2D cluster and comprising currently exempting to authorize
The QoS state report that the QoS of frequency range is satisfied with the factor sends jointly to base station, wherein
Cluster head determines the information about firms for being moved out of D2D cluster based on local channel quality in D2D cluster, that is, determines " out of D2D cluster
It removes how many a members and removes which member "；
Since the report of above-mentioned QoS state is the RRC information of event triggering, it is easily achieved in current LTE system,
QoS state report can also include following information (these contents can be sent to base station in advance):
1) the QoS class simplified identifies (QoS class identifier, QCI)；
2) Maximum Bit Rate；
3) largest packet error rate；
4) data priority；
In addition, in the present embodiment, QoS happy bit can be 1 bit in actual implementation；
Step S5: it is readjusted by scale of the base station to member in D2D cluster, that is, base station passes through cellular signaling chain
Road notifies the member for being moved out of D2D cluster, wherein
Member in D2D cluster is left, there can be following two processing method:
If 1) cellular band has enough resources, the member for removing D2D cluster can be converted back authorized cellular link by base station, from
And it is executed according to base station scheduling and is communicated with interior D2D；
2) base station requires the member for leaving D2D cluster to listen to other licensing free frequency bands, and is formed using other licensing free frequency bands
New licensing free frequency band D2D cluster.
Below with reference to specific example, the present invention is described in detail.
Assuming that D2D cluster is it has been established that eNB control D2D communication operates on licensing free frequency band, so as to avoid cellular band
Congestion.Since before D2D cluster is transformed into licensing free frequency band, D2D communication operates on authorized cellular frequency band under eNB control.Cause
This, D2D cluster communication QoS can be protected.However, QoS will be due to exempting from authorization frequency in D2D cluster when using licensing free frequency band
It can not be ensured with member's movement in unpredictable interference and cluster.It maintains cluster to be transformed into therefore, it is necessary to QoS security mechanism to exempt to award
Weigh the QoS of frequency band.
The present invention proposes the QoS state that the D2D cluster operated on licensing free frequency band is listened to by cluster head.If it find that currently exempting from
Authorized frequency bands not can guarantee QoS, then the cluster scale for adjusting current licensing free frequency band consciously is carried out guaranteed qos.
In order to realize that localization QoS state is listened to, cluster head can in advance be notified QoS information to eNB；The information can wrap
Include the following contents: simplified QoS class mark；Ensure the details parameter sets of bit rate；Maximum Bit Rate；Largest packet error
Rate；Data priority.
Then, it is transmitted by interception data in cluster, cluster head is easy to obtain D2D link in local channel quality and cluster
Actual speed rate.By cluster head preliminary analysis, QoS state report can periodically be sent to eNB, and notice eNB currently exempts to award
The QoS of power frequency band is satisfied with the factor.It may be noted that the QoS state report of this event triggering is easy to through current LTE system RRC
Signaling realizes information transmission.
In actual implementation, 1 bit (as QoS happy bit) instruction QoS can be used and be satisfied with the factor.Therefore, different situations
It can indicate in different ways:
Situation 1: if cluster UE QoS can accurately guarantee, and not allow new UE to be added, then QoS state is not sent to eNB
Report；
Situation 2: if cluster UE QoS can accurately guarantee, and allow new UE to be added, then cluster head is by being satisfied with the factor for QoS
It is determined as 1, periodically sends QoS state report to eNB；
Situation 3: if cluster UE QoS not can guarantee, cluster member has to remove from current licensing free frequency band (so as in cluster
Other UE restore original QoS), then cluster head is determined as 0 by the way that QoS is satisfied with the factor, sends QoS state report to eNB.
In situation 3, including being satisfied with the factor including QoS, based on the QoS analysis that cluster head is tentatively completed, QoS state report
Format may include following manner: 1, as shown in Figure 3a, cluster head removes UE identification list from current cluster；2, it as shown in Figure 3b, adopts
Indicate which UE will be removed from current cluster with UE bit diagram, wherein 1 indicate remove and 0 indicate exist；Bit diagram can root
It is characterized according to the size order of the C-RNTI value of each UE, or characterizes UE in cluster according to other UE special characteristics.In order to illustrate
Expression way separately indicates " listings format " with additional bit.
In addition, in situation 2, as shown in Figure 3c, if there are the additional informations of available bandwidth (to complete on licensing free frequency band
Still have redundancy bandwidth after communication in cluster), then it can be reported to eNB, which is optional in the QoS state report information of situation 2
?.
So far, it is selected based on eNB, can choose any one following method to handle the cluster member being moved out of:
Option 1: if cellular band has enough resources, the cluster member for leaving D2D cluster can be converted back authorization bee by eNB
Nest link is executed and is communicated with interior D2D.
Option 2:eNB, which requires to leave the cluster member of D2D cluster, listens to other licensing free frequency bands, thus composition it is new exempt from authorization frequency
Band D2D cluster.
ENB is selected based on the QoS demand of local state and the UE for switching back into authorized frequency bands.The number high to qos requirement
According to option 1 is selected to maintenance service continuity first.At the same time, licensing free frequency band, which is listened to, is still carrying out.On the other hand,
The business of transmission of trying one's best can receive licensing free frequency band and listen to bring time delay, therefore this kind of business can directly select
Option 2.
Optionally, the selection of eNB can notify cluster head first, then exempting to forward the selection in communication in authorization cluster, lead to
Know each cluster member.In this case, only cluster head needs while safeguarding cellular link and exempts from authorization link, other cluster members
Only need to safeguard a kind of link (be cellular link or be to exempt from authorization link), this can largely reduce the hard of cluster member
Part demand.
In addition, eNB is available to provide that a cluster member executes local QoS as cluster head in advance for the cluster of not cluster head
Listen to process.
In conclusion the present invention listens to licensing free frequency band D2D cluster QoS state by using cluster head, if it find that currently exempting from
Authorized frequency bands not can guarantee QoS, and the cluster scale for adjusting current licensing free frequency band consciously is carried out guaranteed qos.Through the invention,
ENB is not necessarily to exempt to authorize the QoS of D2D cluster by Real-Time Scheduling, it is only necessary to and whole cluster scale, which is lowered, in event triggering mode safeguards QoS,
Therefore eNB control is simplified to exempt to authorize the control signaling of cluster operation.
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 (5)
1. the QoS assurance in a kind of D2D system, which is characterized in that the described method comprises the following steps:
Step S1: establishing D2D cluster, and operates in it in current unlicensed band；
Step S2: the QoS state of D2D cluster in current unlicensed band is listened to by the cluster head in the D2D cluster；
Step S3: by the cluster head according to the actual speed rate of local channel quality and D2D link, current unlicensed band is determined
QoS be satisfied with the factor；
Step S4: when the QoS of the current unlicensed band is satisfied with the factor less than preset QoS happy bit, by described
Cluster head reduces the scale of member in D2D cluster, and by the information about firms comprising being moved out of D2D cluster and includes institute by the cluster head
State current unlicensed band QoS be satisfied with the factor QoS state report send jointly to base station；
Step S5 is moved out of the member of D2D cluster by the base station by cellular signaling link notice.
2. the QoS assurance in D2D system according to claim 1, which is characterized in that the preset QoS is satisfied
Bit is 1 bit.
3. the QoS assurance in D2D system according to claim 1, which is characterized in that in the step S4, institute
It states cluster head and determines the information about firms for being moved out of D2D cluster based on local channel quality in D2D cluster.
4. the QoS assurance in D2D system according to claim 1, which is characterized in that the QoS state report is also
It include: simplified QoS class mark, details parameter sets, Maximum Bit Rate, largest packet error rate and the number for ensureing bit rate
According to priority.
5. the QoS assurance in D2D system according to claim 1, which is characterized in that the step S5 further include:
Any one following mode is selected to handle the member for being moved out of D2D cluster:
1) member for being moved out of D2D cluster is converted back the cellular signaling link of authorization by base station, to make the member for being moved out of D2D cluster
It is executed according to base station scheduling and is communicated with interior D2D；
2) base station requires the member for being moved out of D2D cluster to listen to other licensing free frequency bands, and is formed newly using other licensing free frequency bands
Licensing free frequency band D2D cluster.
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Application publication date: 20190222 |