CN106304375A - A kind of wireless communications method - Google Patents

A kind of wireless communications method Download PDF

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Publication number
CN106304375A
CN106304375A CN201510281912.5A CN201510281912A CN106304375A CN 106304375 A CN106304375 A CN 106304375A CN 201510281912 A CN201510281912 A CN 201510281912A CN 106304375 A CN106304375 A CN 106304375A
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China
Prior art keywords
described
message
subscriber equipment
threshold value
base station
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CN201510281912.5A
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Chinese (zh)
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CN106304375B (en
Inventor
刘建国
韩锋
孟艳
陶涛
谷俊嵘
武卓
王钧
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上海贝尔股份有限公司
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Priority to CN201510281912.5A priority Critical patent/CN106304375B/en
Publication of CN106304375A publication Critical patent/CN106304375A/en
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1205Schedule definition, set-up or creation
    • H04W72/1226Schedule definition, set-up or creation based on channel quality criteria, e.g. channel state dependent scheduling
    • H04W72/1231Schedule definition, set-up or creation based on channel quality criteria, e.g. channel state dependent scheduling using measured or perceived quality
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/002Transmission of channel access control information
    • H04W74/006Transmission of channel access control information in the downlink, i.e. towards the terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10Dynamic resource partitioning
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/08Wireless resource allocation where an allocation plan is defined based on quality criteria
    • H04W72/085Wireless resource allocation where an allocation plan is defined based on quality criteria using measured or perceived quality
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/14Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel using a grant or specific channel

Abstract

A kind of method determining idle channel perception threshold value in the subscriber equipment of LTE communication system, wherein, described idle channel is unauthorized carrier channel, described method includes: described subscriber equipment receives the first message sent from base station, wherein, described first message comprises the first adjusted value for adjusting described threshold value;Described subscriber equipment determines described threshold value according to the maximum transmission power of described first adjusted value and described subscriber equipment.

Description

A kind of wireless communications method

Technical field

The present invention relates to communication technical field, particularly relate to wireless communication technology field.

Background technology

At wireless communication field, it is however generally that, traditional deployment way is that system is operated in and awards Power frequency range (licensed band), the most whole frequency spectrum resource all keeps for this system to use. Typically, LTE communication system uses and authorizes band operation.

But, along with the further growth of wireless traffic, capacity and the frequency to wireless communication system Duan Yaoqiu improves the most therewith.In this case, the mandate resource of frequency range of LTE system seems Relative deficiency is got up.Therefore, one of nearest in LTE field study hotspot is how profit Data service occurred frequently is shunted by the resource of unauthorized frequency range.This kind of scheme is referred to as portion The LTE (LTE in Unlicensed spectrum is called for short LTE-U) belonging to unauthorized carrier wave is System

Such as under one typical scene, LTE system uses the frequency range of WiFi system.I.e. LTE The situation that the community of system and the community of WiFi system at least partly coexist on geographical position. In this case, if LTE system can use WiFi in the moment of some high capacity Frequency range carry out service distributing, it is clear that can be greatly improved the performance of system, thus effectively Reply high capacity application scenarios.

It is clear that in the case of LTE coexists with WiFi system, utilize LTE system The carrier wave that authorizes to assist the unauthorized carrier wave of WiFi system to carry out access be that one is the most direct Selection, accordingly, with respect to authorize auxiliary access (Licensed-Assisted Access be called for short LAA) a big focus of recent moving communicating field has been become.

The existing procedure utilizing LAA technology can farthest continue to use LTE system realizes Authorize carrier aggregation (Carrier Aggregation the is called for short CA) tune of carrier wave and unauthorized carrier wave Degree.But for the system compatible with unauthorized carrier wave, it is desired nonetheless to introduce some new mechanism, One of them matter of utmost importance is how to realize sending out of unauthorized carrier wave in LTE-LAA system (listen before talk is called for short LBT) is intercepted before sending.

Typically, attempt at certain non-when subscriber equipment (User Equipment is called for short UE) Before authorizing carrier channel enterprising row data to send, it is necessary to first determine that this channel is not set by other Standby shared, it is therefore necessary to carry out idle channel perception (Clear Channel Assessment It is called for short CCA) operation, determine that channel is worked as by measuring channel transmitting power level at that time Before whether idle.Specifically, by compare measure arrive launch power level and this UE CCA threshold value (CCA threshold is called for short CCA TL) determines whether UE can account for Use this channel, it is clear that UE whether can the setting value of busy channel and the CCA TL of this UE It is closely-related.In view of the difference launching power of distinct device, existing technology is advised In model, the setting value for CCA TL provides as follows:

23dBm EIRP (Effective is equivalent to for launching power Isotropic Radiated Power is called for short EIRP) and the equipment of values above, its CCA TL value It is set as system lower limit, i.e.-73dBm/MHz;

For launching the power equipment less than 23dBm EIRP, true by following equation (1) Its CCA TL value fixed:

TL=-73dBm/MHz+ (23dBm-PH)/(1MHz) (1)

Wherein PHRepresent the maximum transmission power of this UE.

Obviously, the method considers the equipment that compensating emission power is less, it is to avoid big merit occurs Rate equipment obtains higher access chance, thus ensure that the fairness of channel access.Existing Some WiFi system are successful.

But, when in view of the scene of LTE-LAA, situation is the most different.First, WiFi system mainly considers data service, and LTE system can be same with bearing multiple service Individual UE is different when carrying different business for the requirement of channel performance in fact, according only to Launch power and determine that CCA TL value necessarily causes channel available under some business to separately It is disabled for some business, thus creates the channel occupancy of mistake.Prior It is that the channel occupancy of WiFi system is full bandwidth, and for the LTE system of frequency division multiplexing, UE only may need to use the band segment of unauthorized carrier channel, and UE carries out CCA operation Measure is the polymerizing value that in whole frequency range, all devices launches power, thus result can not essence The channel occupancy situation that really reflection is actual, on the other hand, different UE can use non-simultaneously Authorize the different frequency range of carrier channel, so that the transmitting power increase that channel is overall, lead Cause the access chance minimizing of other UE thus cannot guarantee to access the justice of chance.3rd, In WiFi system, each node is equality, and LTE system is owing to being base station centralized Control, Therefore exist and each UE is accessed the demand that chance is dispatched respectively.

So the target of the present invention is exactly a kind of method finding new determination CCA TL value; This method is required to so that in the case of LTE-LAA, UE carries out energy when CCA operates Meet different business needs;Again can the system of compatible frequency division multiplexing, can also expire simultaneously Foot base station carries out the demand of centralized dispatching.

Summary of the invention

For solving the problems referred to above of the prior art, the present invention proposes a kind of new determination CCA The method of TL value.By the method being sent TL adjusted value to UE by base station, so that it is guaranteed that base Stand and according to practical situation, the CCA operation of UE can be controlled.

Specifically, according to the first aspect of the invention, it is proposed that a kind of in LTE communication system Subscriber equipment in determine the method for idle channel perception threshold value, wherein, described idle letter Road is unauthorized carrier channel, and described method includes: described subscriber equipment receives and sends out from base station The first message sent, wherein, comprises for adjusting described threshold value in described first message First adjusted value;Described subscriber equipment is according to described first adjusted value and described subscriber equipment Maximum transmission power determine described threshold value.

Preferably, also include in described second step, grasp always according to described idle channel perception The bandwidth made determines described threshold value.

It is highly preferred that also include in described second step, described door is determined according to the following equation Limit value:

TL=max (TLmin, min (TLmax,-73dBM+ (23dBm-PH)+10×log10B+ΔTL))

Wherein, TL represents described threshold value, TLminRepresent the lower limit of described threshold value, TLmaxRepresent the upper limit of described threshold value, PHRepresent the maximum transmission power of described subscriber equipment, B represents the bandwidth of described idle channel sense operation, ΔTLRepresent described first adjusted value.

It is highly preferred that the band of described idle channel sense operation a width of described unauthorized carrier wave letter The bandwidth in road.

It is highly preferred that institute is distributed in a width of described base station of the band of described idle channel sense operation State the bandwidth of subscriber equipment.

It is highly preferred that institute is distributed in a width of described base station of the band of described idle channel sense operation State the bandwidth of subscriber equipment.

It is highly preferred that described first message, the second message is radio resource control information.

It is highly preferred that described first message, the second message is layer 1 message.

According to the second aspect of the invention, it is proposed that a kind of in the base station of LTE communication system Assisting user equipment determines the method for idle channel perception threshold value, wherein, described idle letter Road is unauthorized carrier channel, and described method includes: described base station determines for adjusting described First adjusted value of threshold value;Described base station sends the first message to described subscriber equipment, its In, described first message comprises described first adjusted value.

Preferably, above-mentioned first step also includes, described base station determines institute according to following rule State the first adjusted value: when needing the access chance improving described subscriber equipment, increase described First adjusted value;When needing the link performance improving described subscriber equipment, reduce described One adjusted value.

Preferably, also including after above-mentioned second step, described base station is to described subscriber equipment Send the second message, wherein, described second message comprises described idle channel sense operation Bandwidth.

It is highly preferred that described first message, the second message is radio resource control information.

It is highly preferred that described first message, the second message is layer 1 message.

According to the third aspect of the invention we, it is proposed that a kind of user in LTE communication system sets The standby middle equipment determining idle channel perception threshold value, wherein, described idle channel is non-awarding Power carrier channel, described equipment includes: receiver module, for described subscriber equipment receive from The first message that base station sends, wherein, comprises for adjusting described door in described first message First adjusted value of limit value;Determine module, adjust according to described first for described subscriber equipment The maximum transmission power of whole value and described subscriber equipment determines described threshold value.

According to the fourth aspect of the invention, it is proposed that a kind of in the base station of LTE communication system Assisting user equipment determines the equipment of idle channel perception threshold value, wherein, described idle letter Road is unauthorized carrier channel, and described equipment comprises determining that module, true for described base station Fixed the first adjusted value for adjusting described threshold value;Sending module, for described base station to Described subscriber equipment sends the first message, wherein, comprises described first in described first message Adjusted value.

In the present invention, by being sent TL adjusted value by base station to UE, so that base station can The CCA operation of UE is adjusted according to actual demand, both can be according to business feelings Difference is arranged, and may be used for again adjusting access probability, and by the frequency range that CCA is operated Scope is also introduced into the method that CCA TL value calculates, and meets the actual feelings of Frequency Division Multiplexing system Condition, it is achieved thereby that the target of the present invention.

Accompanying drawing explanation

The following detailed description to non-limiting example is read by referring to accompanying drawing, this Further feature, purpose and the advantage of invention will will become more apparent.

Fig. 1 show according to the present invention a kind of in the subscriber equipment of LTE communication system really Determine the flow chart of the method for idle channel perception threshold value;

Fig. 2 shows a kind of auxiliary use in the base station of LTE communication system according to the present invention Family equipment determines the flow chart of the method for idle channel perception threshold value;

Fig. 3 show according to the present invention a kind of in the subscriber equipment of LTE communication system really Determine the block diagram of the equipment of idle channel perception threshold value;

Fig. 4 shows a kind of auxiliary use in the base station of LTE communication system according to the present invention Family equipment determines the block diagram of the equipment of idle channel perception threshold value.

Wherein, same or analogous reference represents same or analogous steps characteristic or dress Put/module.

Detailed description of the invention

In the specific descriptions of following preferred embodiment, will be with reference to constituting a present invention part Appended accompanying drawing.Appended accompanying drawing has been illustrated by way of example and has been capable of the present invention Specific embodiment.The embodiment of example is not intended as the limit all realities according to the present invention Execute example.It is appreciated that without departing from the scope of the present invention, it is possible to use other Embodiment, it is also possible to carry out the structural or amendment of logicality.Therefore, following concrete Describe and nonrestrictive, and the scope of the present invention is defined by the claims appended hereto.

First, application according to the present invention scene, have what a LTE communication system covered Region, including at least one base station and UE.There is also the non-of other in this this region external to award Power carrier wave, wherein, this unauthorized carrier wave can also be other LTE or WiFi communication system Used.

When this base station thinks that this UE is necessary to use this unauthorized carrier channel to be transmitted In the moment, this UE can carry out CCA operation in this unauthorized carrier channel, to confirm at this In one moment, this unauthorized carrier channel is the most idle available.The result of this CCA operation is logical Cross and compare the transmission power level obtained by measurement with CCA TL value to determine that channel is the most idle. Therefore, first this UE is it needs to be determined that this CCA operates the CCA TL value used, root According to the method for the present invention, the determination of this CCA TL value is except needing the side according to prior art Method considers the maximum transmission power of this UE, the most i.e. this UE maximum in burst transfer Launch outside power, in addition it is also necessary to according to the instruction of base station, CCA TL value is adjusted, under Literary composition referred to as the first adjusted value.This first adjusted value is sent to being somebody's turn to do by the first message by base station After UE, this UE receive this first message, obtain this first adjusted value according to oneself Big power of launching determines the CCA TL value that this CCA operates.It is more than the basic of the present invention Solution.By this first adjusted value determined by base station, base station can realize multiple control Mode processed, meets the demand of miscellaneous service and scheduling, it is achieved thereby that the target of the present invention.

The present invention based on such scheme, it is further proposed that, can this CCA operate in introduce The concept of bandwidth, i.e. the determination method of this CCA TL value it is also conceivable to this CCA operation Bandwidth, so can obtain channel-aware result more accurately in the system of frequency division multiplexing, Thus avoid destroying the justice of channel access in the case of LTE-FDD system access.

On this basis, according to one embodiment of present invention, it is proposed that one determines CCA The method of TL value.Concrete, determine described threshold value according to following equation (2):

TL=max (TLmin, min (TLmax,-73dBM+ (23dBm-PH)+10×log10B+ΔTL)) (2)

Wherein, TL represents described threshold value, TLminRepresent the lower limit of described threshold value, TLmaxRepresenting the upper limit of described threshold value, the value of this up/down limit can be that system is arranged in advance Alright, or base station by wireless heterogeneous networks (Radio Resource Control be called for short RRC) signal deployment, it is therefore an objective to the threshold value determined is limited in a rational scope Within.PHRepresenting the maximum transmission power of this UE, B represents the bandwidth of this CCA operation, ΔTLRepresent this first adjusted value.

Further, the B in formula (2) can be determined by following several ways, i.e. The value of the bandwidth of this CCA operation.

Such as, the value of B can be the bandwidth of this unauthorized carrier channel, i.e. this CCA grasps Making to carry out in whole channel bands, this mode, closest to prior art, can apply to In time-multiplexed system.

The most such as, the value of B can be that this UE is distributed to by resource allocation message in this base station The bandwidth used, this is typically applied to the system of frequency division multiplexing, and this UE can be made will Carry out channel-aware in the bandwidth used, thus obtain result the most accurately.

The value of B can also is that this base station is explicitly indicated to this UE by the second message, this Primarily to the purpose that base station carries out flexible dispatching gives a specific bandwidth range, To realize the multiple central controlled function of base station side.

Without loss of generality, the first message in each embodiment above-mentioned, the second message is the most permissible It is RRC signaling message, it is also possible to be layer 1 (layer 1) message.

Accompanying drawing 1 shows the flow chart determining CCA TL value according to above-described embodiment, including:

The most described subscriber equipment receives the first message sent from base station, wherein, described the One message comprises the first adjusted value for adjusting described threshold value;

The most described subscriber equipment is according to described first adjusted value and described subscriber equipment Big power of launching determines described threshold value.

Corresponding, according to another embodiment of the invention, it is proposed that a kind of logical at LTE The base station of communication system assists the method determining CCA TL value.Concrete:

Base station determines this first adjusted value noted above, and by the first message by this One adjusted value sends to this UE.

Further, following principle should be followed when this base station determines the first adjusted value:

1. if needing to improve this UE to access the probability of this unauthorized carrier channel, then increase This first adjusted value.According to formula (2) it can be seen that the CCA of now this UE TL value increases therewith, even if i.e. allowing this UE in the transmitting merit measured in channel Remain to access this channel when rate is higher, thus improve the access delay of this UE Can, to meet the demand of real-time service.

2. if need the link performance improving this UE, then reduce this first adjusted value. According to formula (2) it can be seen that now the CCA TL value of this UE reduce therewith, I.e. require that this UE carries out channel-aware in a wider context, so that it is guaranteed that this channel The most unoccupied, further avoid cochannel interference, thus Improve link performance.Access alternatively, it is also possible to provide more to other equipment Chance.

Being similar to, next this base station can send the second message to this UE, is used for notifying The specific span of CCA bandwidth of operation B.

The most without loss of generality, the first message in each embodiment above-mentioned, the second message was both Can be RRC signaling message, it is also possible to be layer 1 (layer 1) message.

Accompanying drawing 2 shows the flow chart activating Scell according to above-described embodiment, including:

The most described base station determines the first adjusted value for adjusting described threshold value;

The most described base station sends the first message, wherein, described first to described subscriber equipment Message comprises described first adjusted value.

Hereinafter combine accompanying drawing again and introduce set corresponding with said method provided by the present invention Standby, in view of unit/device characteristic therein has corresponding relation with the steps characteristic in said method, To conform to the principle of simplicity.

Accompanying drawing 3 shows and determines in the UE of LTE communication system according to a kind of of the present invention The equipment 30 of idle channel perception threshold value, described equipment includes:

Receiver module 3001, receives the first message sent from base station for described subscriber equipment, Wherein, described first message comprises the first adjusted value for adjusting described threshold value;

Determine module 3002, for described subscriber equipment according to described first adjusted value and institute The maximum transmission power stating subscriber equipment determines described threshold value.

Accompanying drawing 4 shows and assists in the base station of LTE communication system according to a kind of of the present invention UE determines the equipment 40 of idle channel perception threshold value, and described equipment includes:

Determine module 4001, determine for described base station for adjust described threshold value first Adjusted value;

Sending module 4002, sends the first message for described base station to described subscriber equipment, Wherein, described first message comprises described first adjusted value.

Above embodiments of the invention are described, but the invention is not limited in spy Fixed system, equipment and concrete agreement, those skilled in that art can want in appended right Various deformation or amendment is made in the range of asking.

The those skilled in the art of those the art can be by research description, disclosed Content and accompanying drawing and appending claims, understand and implement the embodiment disclosed Other change.In the claims, word " includes " element and the step being not excluded for other, And wording " one " is not excluded for plural number.In the present invention, " first ", " second " Only represent title, do not represent orbution.In the actual application of invention, a part can The function of multiple technical characteristics cited in claim can be performed.Appointing in claim What reference should not be construed as the restriction to scope.

Claims (15)

1. one kind determines idle channel perception threshold value in the subscriber equipment of LTE communication system Method, wherein, described idle channel is unauthorized carrier channel, and described method includes:
The most described subscriber equipment receives the first message sent from base station, wherein, described first Message comprises the first adjusted value for adjusting described threshold value;
The most described subscriber equipment is according to described first adjusted value and the maximum of described subscriber equipment Launch power and determine described threshold value.
Method the most according to claim 1, wherein, described step b also includes, also Bandwidth according to described idle channel sense operation determines described threshold value.
Method the most according to claim 2, wherein, described step b also includes, root Described threshold value is determined according to following equation:
TL=max (TLmin, min (TLmax,-73dBM+ (23dBm-PH)+10×log10B+ΔTL))
Wherein, TL represents described threshold value, TLminRepresent the lower limit of described threshold value, TLmax Represent the upper limit of described threshold value, PHRepresent the maximum transmission power of described subscriber equipment, B Represent the bandwidth of described idle channel sense operation, ΔTLRepresent described first adjusted value.
Method the most according to claim 2, wherein, described idle channel sense operation The bandwidth with a width of described unauthorized carrier channel.
Method the most according to claim 2, wherein, described idle channel sense operation The bandwidth distributing to described subscriber equipment with a width of described base station.
Method the most according to claim 2, wherein, described idle channel sense operation The a width of described base station of band determined and passed through subscriber equipment described in the second message informing.
Method the most according to claim 6, wherein, described first message, second disappears Breath is radio resource control information.
Method the most according to claim 6, wherein, described first message, second disappears Breath is layer 1 message.
9. one kind in the base station of LTE communication system assisting user equipment determine idle channel sense The method knowing threshold value, wherein, described idle channel is unauthorized carrier channel, described side Method includes:
The most described base station determines the first adjusted value for adjusting described threshold value;
The most described base station sends the first message to described subscriber equipment, and wherein, described first disappears Breath comprises described first adjusted value.
Method the most according to claim 9, wherein, in described step A, institute State base station and determine described first adjusted value according to following rule:
When needing the access chance improving described subscriber equipment, increase described first adjusted value;
When needing the link performance improving described subscriber equipment, reduce described first adjusted value.
11. methods according to claim 9, wherein, after described step B, also Including:
The most described base station sends the second message to described subscriber equipment, and wherein, described second disappears Breath comprises the bandwidth of described idle channel sense operation.
12. methods according to claim 9, wherein, described first message, second Message is radio resource control information.
13. methods according to claim 9, wherein, described first message, second Message is layer 1 message.
14. 1 kinds determine idle channel perception thresholding in the subscriber equipment of LTE communication system The equipment of value, wherein, described idle channel is unauthorized carrier channel, and described equipment includes:
Receiver module, receives the first message sent from base station for described subscriber equipment, its In, described first message comprises the first adjusted value for adjusting described threshold value;
Determine module, for described subscriber equipment according to described first adjusted value and described use The maximum transmission power of family equipment determines described threshold value.
15. 1 kinds in the base station of LTE communication system assisting user equipment determine idle channel The equipment of perception threshold value, wherein, described idle channel is unauthorized carrier channel, described Equipment includes:
Determine module, determine the first adjustment for adjusting described threshold value for described base station Value;
Sending module, sends the first message for described base station to described subscriber equipment, wherein, Described first message comprises described first adjusted value.
CN201510281912.5A 2015-05-28 2015-05-28 Wireless communication method CN106304375B (en)

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