CN108990163A - Downlink channel condition feedback method, base station, user equipment and storage medium - Google Patents
Downlink channel condition feedback method, base station, user equipment and storage medium Download PDFInfo
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- CN108990163A CN108990163A CN201810995198.XA CN201810995198A CN108990163A CN 108990163 A CN108990163 A CN 108990163A CN 201810995198 A CN201810995198 A CN 201810995198A CN 108990163 A CN108990163 A CN 108990163A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention relates to downlink channel condition feedback method, base station, user equipment and storage mediums.This method comprises: base station sends signaling to user equipment, the notifying user equipment N number of subband group to be measured, the corresponding information feedback parameter of a reference subband group in the subband group mark and/or subband identities and N number of subband group of N number of subband group is carried in the signaling, wherein, each subband group contains one or more subbands in N number of subband group, and N is the integer more than or equal to 2；Base station receives multiple channel state informations by feedback subband of user equipment feedback, multiple by feedback subband includes at least one subband in each subband group, and the feedback parameter for being used for transmission multiple channel state informations by feedback subband is that user equipment is determined based on using with reference to the corresponding information feedback parameter of subband group.Based on the present invention, base station not only can or preferably subband optimal for user equipment selection, but also save signaling overheads, realize power saving.
Description
Technical field
The present invention relates to the Internet of Things communications field, more particularly to the Internet of Things communication technology of enhancing, in particular to a kind of objects
Downlink channel condition feedback method, base station, user equipment and storage medium in networking.
Background technique
With the development of technology, Internet of Things (Internet of Thing, IoT) has gradually entered into the side of people's life
Aspect face, Internet of Things are the important component of generation information technology, and the important development stage in " informationization " epoch.Object
The core of networking and basis are still internet, are extension and extension based on the internet.
Internet of Things traditional LTE machine-type communication (Machine Type Communication,
MTC) in system, mobile station (or user equipment (UE)) is configured to reside in a subband of system bandwidth
On.Mobile station is required the channel state information of only measurement and the subband configured to base station feedback.This one side of measurement method
Face seem can power saving because mobile station only needs to measure the channel state information of a subband, but then, this meaning
Communication of the mobile station with base station can only be transmitted on this height band configured, and this subband of moving table measuring can
It can not be the subband that channel status is optimal in system bandwidth, this will lead to the subband that base station can not be optimal for mobile station in selecting, or
Person can not select modulation coding scheme to match with channel etc., and system capacity loss or mobile station is caused not to examine successfully
A series of problems, such as surveying downlink signal.
In real network, the channel circumstance as locating for each mobile station is different, and channel quality is also not quite similar.Separately
Outside for the different sub-band in a system bandwidth, the channel quality that same mobile station " can be experienced " is also different.For this purpose,
Base station needs the subband that channel quality is good to be distributed to corresponding mobile station as far as possible, to make according to channel quality information
Mobile station is more reliably communicated with base station, is increased the entrained information content of each signal transmission, is increased power system capacity simultaneously to reach
And the purpose of power saving.
For this purpose, 4G and 5G system indicates to communicate with channel state information (Channel State Information, CSI)
The qualitative attribute of the channel of link.Channel state information includes that such as channel quality indicates (Channel Quality
Indicator, CQI), pre-coding matrix instruction (Precoding Matrix Indicator, PMI) and channel matrix order instruction
(Rank Indicator, RI) etc..Under normal circumstances, channel state information is obtained by mobile station by measuring downlink reference signal
It arrives, and feeds back to base station.Thus base station carries out link circuit self-adapting, adjustment sends parameter, and such as distributing channel condition, good bandwidth is given
Mobile station modulates mobile station coding mode, pre-coding matrix adjustment etc..But subband measurement in traditional LTE MTC and anti-
Under feedback scheme, base station is unable to get accurate channel state information, and is adjusted according to invalid information and send parameter, this will lead to base
Standing can not select optimal subband to mobile station, or can not select the modulation coding scheme to match with channel etc., cause be
A series of problems, such as system capacitance loss or mobile station can not successfully detect downlink signal, if signal transmission time is long, signal solution
The problems such as tonality can be poor, causes the power-consuming of mobile station side instead.
Therefore, channel state information how is obtained efficiently to carry out for the best subband of mobile station distribution channel status
Communication improves communication quality, while realizing the purpose of power saving again, becomes expectation and solves the problems, such as.
Summary of the invention
Embodiments of the present invention are proposed in view of the above problem of the prior art, it is intended to solve existing in the prior art one
The shortcomings that kind or more, at least provide a kind of beneficial selection.
In order to achieve the object of the present invention, embodiments of the present invention provide aspect below.
According to the first aspect of the invention, a kind of downlink channel condition feedback method is provided, this method includes following step
It is rapid:
Base station sends signaling, the notifying user equipment N number of subband group to be measured, wherein in the signaling to user equipment
It carries fed back, conduct in the subband group mark and/or subband identities and N number of subband group of N number of subband group
With reference to the information feedback parameter of a subband of subband, wherein each subband group contains one in N number of subband group
A or multiple subbands and N number of subband group contain altogether multiple subbands, and N is the integer more than or equal to 1；
Base station receives multiple channel state informations by feedback subband of user equipment feedback, wherein the multiple anti-
Feedback subband includes at least one subband in each subband group, for feeding back the multiple channel state information by feedback subband
Information feedback parameter be that the user equipment is based on reference to the corresponding information feedback parameter of subband group
Determining.
In one embodiment, the method also includes: based on user equipment feedback subband channel state information, base station
A subband is selected from the multiple subbands fed back, and is the subband of user device configuration selection, to be communicated.
According to another aspect of the present invention, a kind of downlink channel condition feedback method is provided, this method includes following step
It is rapid:
User equipment receives the signaling that base station is sent, and the subband group mark and/or subband of N number of subband group are carried in the signaling
The information feedback of a subband being fed back, as reference subband is joined in mark and N number of subband group
Number, wherein each subband group contains one or more subbands in N number of subband group and N number of subband group contains altogether multiple sons
Band, N are the integer more than or equal to 1；
User equipment measures the channel state information of each subband in N number of subband group, and based on corresponding with reference to subband group
The multiple information feedback parameters by feedback subband to be fed back of information feedback parameter determination,
In, the multiple by feedback subband includes at least one subband in each subband group；
User equipment is multiple to base station feedback based on determining multiple information feedback parameters by feedback subband
By the channel state information of feedback subband.
In one embodiment, this method may also include that user equipment receives base station and selected in feedback subband from the multiple
It the information for the subband selected and is communicated using the subband of the selection with base station.
In one embodiment, the corresponding information feedback parameter of the reference subband group includes: anti-with reference to first
Present the moment: it is to feed back the moment with reference to one in subband group first with reference to subband to be feedback, relative to the 0th son of the 0th frame
The time migration of frame indicates；And the reference feedback period: it is to be feedback with reference to the adjacent of subband with reference to one in subband group
The time interval fed back twice.The multiple by the information feedback parameter of feedback subband includes: by feedback subband
Feedback cycle is identical as the reference feedback period to be each by the adjacent time interval fed back twice of feedback subband；With
And the moment is fed back by the first of feedback subband, the moment is fed back by the first of feedback subband to be each, relative to the 0th frame the
The time migration of 0 subframe indicates, wherein respectively by feedback subband first feed back the moment be based on described with reference to the first feedback when
It carves, the reference feedback period and to be feedback with reference to subband and currently determined by the relative positional relationship of feedback subband.
In one embodiment, it is the multiple by feedback subband first feedback the moment be to be determined based on following formula: tk
=(k-j) × p/M+t；In formula, tkThe moment is fed back by the first of feedback subband by k-th in feedback subband to be the multiple, j is
As by j-th of feedback reference subband, by feedback subband, p is the reference feedback period, when t is first feedback of reference
It carves, M is the multiple number by feedback subband, wherein the multiple by feedback subband is to be existed according to each by feedback subband
What the relative position on frequency domain was sorted.
Method as above of the invention is preferably applied in Internet of Things, especially in narrowband Internet of Things.
In embodiments of the present invention, the multiple by feedback subband may include at least one of optimal quality in each subband group
A subband.
According to another aspect, the present invention also provides a kind of base station, which includes memory and processor, the processing
Device is configured as executing the computer program code stored on memory to execute the step such as the aforementioned method as performed by base station
Suddenly.
According to another aspect, the present invention also provides a kind of user equipment, which includes processor and memory,
It is set as previously described by user the processor is configured to executing the computer program code stored on the memory with executing
The step of standby method executed.
The present invention also provides a kind of storage mediums according to another aspect, are stored thereon with computer program code, execute
The downlink channel condition feedback method executed as previously described by base station is realized when the code.
The present invention also provides a kind of storage mediums according to another aspect, are stored thereon with computer program code, execute
The downlink channel condition feedback method executed as previously described by user equipment is realized when the code.
According to the feedback method of the disclosure, base station can be optimal for mobile station in selecting or preferably subband carries out signal biography
It is defeated, the reliability and speed of information transmission are improved, and reduce the expense of signaling, realizes the more power saving of Mobile Terminal.
Detailed description of the invention
Below with reference to the accompanying drawings illustrate embodiments of the invention, the invention will be more easily understood it is above and its
Its objects, features and advantages.Component in attached drawing is not proportional drafting, and is intended merely to show the principle of the present invention.For
Convenient for showing and describe some parts of the invention, corresponding part may be amplified in attached drawing, that is, make it relative in foundation
Other components in the practical exemplary means manufactured of the present invention become much larger.In the accompanying drawings, identical or corresponding technology is special
Sign or component will be indicated using identical or corresponding appended drawing reference.
Fig. 1 shows the flow chart of Internet of Things downlink channel condition feedback method according to an embodiment of the present invention；
Subband example is referred to Fig. 2 shows according to an embodiment of the present invention；
Fig. 3 shows the example of determining feedback parameter according to an embodiment of the present invention；
Fig. 4 shows another example of determining feedback parameter according to an embodiment of the present invention；
Fig. 5 shows the another example of determining feedback parameter according to an embodiment of the present invention；
Fig. 6 shows the flow chart of communication means according to an embodiment of the present invention.
Specific embodiment
Illustrate embodiments of the present invention with reference to the accompanying drawings.In the description and accompanying drawings, this is disclosed in detail
The particular implementation of invention, specifying the principle of the present invention can be in a manner of adopted.It should be understood that the present invention is in range
It is not so limited.In the range of the spirit and terms of appended claims, the present invention include many changes, modifications and
It is equivalent.
It should be noted that for purposes of clarity, unrelated to the invention, the common skill in this field is omitted in attached drawing and explanation
The expression and description of component known to art personnel and processing.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It uses in a other embodiment, is combined with the feature in other embodiment, or the feature in substitution other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, element, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, element, step or component.
Below by taking Internet of Things network communication system as an example, Internet of Things downlink channel condition feedback of the invention is illustrated referring to attached drawing 1
Method.Fig. 1 is the schematic diagram of downlink channel condition feedback method according to an embodiment of the invention.As an example, of the invention
Downlink channel condition feedback method can be implemented by the base station in Internet of Things.
As shown in Figure 1, the downlink channel condition feedback method the following steps are included:
Step S102, base station send signaling, the notifying user equipment N number of subband group to be measured to user equipment, wherein should
It is carried fed back, work in signaling in the subband group mark and/or subband identities and N number of subband group of N number of subband group
For channel state information (CSI) feedback parameter of a subband with reference to subband.It is referred to that is, base station has been user device configuration
The CSI feedback parameter of subband.It for ease of description, can will include being known as referring to subband group with reference to the subband group of subband, with reference to son
It is the subband group that one of them has been configured for reference sub-band channel status information (CSI) feedback parameter of reference with group.
In base station side, need to measure in N number of subband group of CSI included subband to be measured can according to existing means or
The means developed later are configured by base station, can also be pre-configured with otherwise or base station is pre-configured from external receive
The information of subband to be measured, it is not limited here.
In the embodiment of the present invention, each subband group can contain one or more subbands, and this N number of subband in N number of subband group
Group contains altogether multiple subbands, and N is the integer more than or equal to 1.Such as:
(1) it is used as a kind of situation, can configure more than two subband groups, each subband group can contain a subband, at this time
It can also regard as and subband be not grouped, subband group indicates single subband at this time.In this case, with reference to being wrapped in subband group
The subband contained is to refer to subband.
(2) as another situation, 1 subband group can be only configured, which contains multiple subbands, one of son
Band is with reference to subband.
(3) as another situation, multiple (two or more) subband groups can be pre-configured with, each subband group can contain one
The above subband, and total sub-band number is greater than subband group number, that is to say, that contain multiple subbands at least one subband group.This is more
The quantity for the subband to be measured for respectively including in a subband group is preferably identical, and however, you can also not same.In this case, by which son
Band group can be predefined as with reference to subband group, in the case where multiple subbands are contained in reference subband group, by which subband
The CSI measurement result of each subband can be selected according to subsequent user terminal with reference to quality in subband group most as reference subband
Excellent or preferably subband is used as and refers to subband, but is that base station is preconfigured with reference to the CSI feedback parameter of subband.
In an embodiment of the invention, in order to reduce signaling overheads, base station is only that user device configuration includes a ginseng
The corresponding CSI feedback parameter of reference subband group (namely CSI feedback parameter with reference to subband) of subband is examined, and passes through above-mentioned signaling
Send user equipment to.The subband that user equipment will feed back CSI information in subband group has been determined ceases and to feed back its CSI information
When, it is sorted based on the relative position of the corresponding CSI feedback parameter of reference subband group and the subband to be fed back, so that it may determine
With reference to the CSI feedback parameter of other subbands to be fed back except subband, wherein the relative position sequence of subband in N number of subband group
It can be the relative position sequence based on subband on frequency domain, but the present invention is not limited thereto.Herein, CSI feedback parameter can
Time and period including CSI feedback.
In embodiments of the present invention, subband group/subband mark for example can be subband group/subband number (such as rope
Draw) but it is also possible to be can recognize that subband group/subband position sequence other identifier.Contain a subband in subband group
In the case of, the number of subband group can be equal to subband number, naturally it is also possible to different.Preferably, base station can be according to every height
Relative position (ascending relative position or descending relative position on such as frequency domain with group/subband on frequency domain
Deng), it is numbered for subband group/subband.User equipment can identify subband group/subband number according to principle identical with base station
Or it is numbered for subband group.In the case where each subband group contains multiple subbands, the subband in subband group can also have
Subband identities (such as subband number).For reference subband group, base station can be based on the principle progress good with user equipment offered
Setting or instruction (as provide first subband group or other), user equipment can based on identical principle identification refer to subband
Group.
In an embodiment of the present invention, the signaling that base station is sent is that downlink radio resource controls RRC (radio resource
Control) signaling, the signaling can be transmitted on some subband in N number of subband group.It is of course also possible to be believed with other
Multiple subbands that notifying user equipment to be measured are enabled, MAC layer signaling and physical layer signaling are such as used.Base station can use any existing
Known means or the means developed later carry out the information that notifying user equipment needs the subband of measure channel state information,
It is not limited here.
After user equipment receives the subband group information that base station configures in signaling, subband in subband group can be carried out
CSI measurement, the determination subband to be fed back, and derived based on the CSI feedback parameter for referring to subband in reference subband group with reference to son
The CSI feedback parameter of these subbands to be fed back except band, thus and to base station feedback measurement result.To base station feedback
When as a result, user equipment can be indicated based on identical with base station expression rule son which with which subband in group, it is such as right
Subband in subband group is numbered.
In embodiments of the present invention, in the case where each subband group only contains a subband, user equipment is based on each son
CSI of the CSI feedback parameter of subband to be feedback with group to each subband to be feedback of base station feedback.Contain in each subband group multiple
In the case where subband, user equipment can an only subband optimal into each subband group of base station feedback CSI, at this point, a son
Band organizes a corresponding CSI feedback parameter, i.e., the CSI feedback parameter of optimal subband in the subband group.Certainly, as needed, user
Equipment can also be optimal into each subband group of base station feedback more than two subbands CSI, at this point, user equipment is wanted having determined
After the subband of feedback, the opposite position of CSI feedback parameter and the subband to be fed back equally based on the reference subband to be fed back
Set sequence, so that it may determine in N number of subband group with reference to the CSI feedback parameter of other subbands to be fed back except subband.
In embodiments of the present invention, it can be determined based on the principle of network side (such as base station) and user equipment offered
The CSI of several subbands is fed back in each subband group.
As an example, multiple the first feedback moment by feedback subband in N number of subband group can be determined based on following formula:
tk=(k-j) × p/M+t；
In formula, tkIt is fed back the moment by k-th in feedback subband by the first of feedback subband to be multiple, j is as with reference to son
By feedback subband, p is feedback cycle for j-th of band, and t is to feed back the moment with reference to the first of subband, and M is multiple by feedback subband
Number, 2≤M≤N, wherein multiple by feedback subband is sorted according to each relative position by feedback subband on frequency domain.
Step S104, base station receives in each subband group of user equipment feedback by the CSI of feedback subband, in each subband group
Comprising at least one by feedback subband.
Step S106, based on the received CSI by feedback subband, base station selects one from the multiple subbands fed back
A subband, and be the subband of user device configuration selection, to be communicated.
Based on the CSI of the received subband fed back, base station can be selected from the subband that these are fed back it is optimal or
Preferably subband and it is allocated to user equipment, user equipment is based on, and base station selected optimal or preferably subband carries out letter
Number transmission, improve information transmission reliability and speed.Further, since base station is only carried into the message of notification of user equipment
With reference to the CSI feedback parameter of subband, and the CSI feedback parameter of not all multiple subbands, that is, do not need for each subband arrangement it is anti-
Feedforward parameter, therefore signaling overheads is greatly saved, and improve communication quality, it can really realize the purpose of power saving.
In some embodiments of the invention, base station can identify the reference subband group of N number of subband group in the signaling, can also
To be indicated by making an appointment regulation with user equipment with reference to subband group.For example, base station can make a reservation in advance with user equipment
Index the subband group where the smallest subband be with reference to subband group, alternatively, base station can with arranged in the preparatory signaling of user equipment
Sequence is with reference to subband group in most preceding subband group.Can further it be subtracted by being indicated according to rule is made an appointment with reference to subband group
The expense of small signaling.
Separately below by subband group containing 1 subband and multiple subbands for method of the invention is described.
Embodiment 1
The present embodiment is the case where containing a subband in each subband group, that is, the feelings not being grouped to subband
Condition, it is understood that for a subband group be exactly a subband.
The case where Fig. 2 show 3 schematic diagrames with reference to subband in one embodiment of the invention, is N=3.
In the present embodiment, base station is 3 downlink subbands to be measured that user device configuration needs to measure, thus base station to
The CSI feedback parameter that subband is referred in the mark and 3 subbands of 3 subbands is carried in the signaling that user equipment is sent,
3 subbands to be measured with notifying user equipment.
The mark of 3 subbands for example can be the number (as index) of subband, according to each subband on frequency domain by small
To big relative position, mobile station and base station can be numbered according to uniform principles for it.In the illustrated example shown in fig. 2, according to
The position of frequency domain, number are respectively #1, #2, #3.It wherein, is to index the smallest subband in subband to be measured with reference to subband.Alternatively,
It can also be using the subband indicated by the most preceding or last or subband index of specific position of sequence in signaling as with reference to subband.This
Sample, base station can make user terminal identify with reference to subband in the case where not increasing signaling overheads.In addition, base station can also be with
It selects from the subband to be measured configured a subband for reference to subband according to other rules, and is allocated to user equipment.This
When, it is the reference subband identities with reference to subband that mark subband can be also carried in the signaling that base station is sent to user equipment.
Base station only need for mobile station configure with reference to subband CSI feedback parameter, other subbands to be fed back it is anti-
Thus configuration that feedforward parameter refers to subband is derived by.This does not need base station for each subband arrangement parameter, reduces letter
The expense of order.
The parameter of the CSI feedback of the reference subband of base station configuration may include the time and period of CSI feedback, be measured simultaneously
The time and period of the CSI feedback of other subbands in subband to be feedback in addition to reference subband can be according to reference subbands
The time and period of CSI feedback are derived by.
One typical example are as follows: for reference subband, base station configures following feedback parameter:
First feedback moment t: the first feedback moment with reference to subband is with the time migration relative to the 0th subframe of the 0th frame
Come what is indicated, as an example, as unit of number of sub frames；And
Feedback cycle p: with reference to the adjacent time interval fed back twice of subband, as an example, as unit of number of sub frames.
Assuming that base station is configured with N number of subband for needing to measure altogether, other needs referred to except subband in these subbands are anti-
The CSI feedback period of the subband of feedback can be identical with the feedback cycle of reference subband.In the present embodiment, N number of the wanting of base station configuration
The subband of measurement requires to feed back its CSI measurement result by user equipment, the of k-th of subband in these subbands to be fed back
One feedback moment tkIt can be obtained according to the feedback parameter of reference subband by formula (1):
tk=(k-j) × p/N+t, wherein k=1,2 ... ... N (1)
Wherein, j is the serial number that subband is referred in N number of subband to be fed back, in the present embodiment, j=1, in alternative implementation
In example, j can be other sequence number values.In case where including 3 subbands (being subband to be feedback) to be measured shown in Fig. 2, ginseng
The moment of the feedback for the first time t for examining subband #1 is the 4th subframe (t=4), feedback cycle p=30 (subframe).According to formula (1), based on reference
First feedback moment of subband and feedback cycle can determine: the feedback for the first time of subband #2 (the 2nd subband to be feedback) to be feedback
Moment (that is, first feedback moment) is the 14th subframe, and the moment of feedback for the first time of subband #3 (the 3rd subband to be feedback) to be feedback is
24th subframe, the 2nd feedback moment with reference to subband #1 are the 34th subframe, and second of feedback moment of subband #2 to be measured is the 44th
Subframe, the 2nd feedback moment of subband #3 to be measured are the 54th subframe, and so on, as shown in Figure 3.Subband #1 (reference to be feedback
Subband), subband #2 to be feedback, subband #3 to be feedback feedback cycle be p.
In the embodiment, base station is sent in the number and 3 subbands for carry 3 subbands to user equipment with reference to son
After the signaling of the CSI feedback parameter of band, user equipment receives the signaling, and the CSI feedback parameter based on reference subband derives
The CSI feedback parameter of other 2 subbands to be feedback out after realization subband CSI measurement and feeds back to base station.Base station receives each subband
CSI select optimal quality or preferably subband for user, and for selected by user device configuration and based on the CSI received
Subband, using optimal or preferably subband is communicated.
As it can be seen that the technical solution based on the embodiment of the present invention, base station can be optimal or preferably sub for user equipment selection
Band carries out signal transmission, improves the reliability and speed of information transmission, and without transmission with reference to the CSI feedback ginseng except subband
Number, reduces the expense of signaling, and improve communication quality, to be truly realized the power saving of Mobile Terminal.
Embodiment 2
The present embodiment is the feelings containing multiple subbands to be measured at least one subband group of N number of subband group of base station configuration
Condition, in this case, base station can for user device configuration refer to subband group, and configure with reference to subband group CSI feedback parameter (i.e.
With reference to the CSI feedback parameter of the reference subband with feedback in subband group).User equipment receives using for notice from base station
After the signaling of the family equipment N number of subband group to be measured, measure the CSI of subband to be measured in N number of subband group, and determination to be fed back
Subband (an optimal subband of channel quality in each subband group), and the CSI feedback parameter based on reference subband derives N number of son
It is roughly the same with embodiment 1 to derive mode for CSI feedback parameter with subband to be feedback in group.For example, following formula can be based on
The moment is fed back to derive in N number of subband group multiple (M) by the first of feedback subband:
tk=(k-j) × p/M+t, wherein k=1,2 ... ... M (2)；
In formula, tkIt is fed back the moment by k-th in feedback subband by the first of feedback subband to be multiple, j is as with reference to son
By feedback subband, p is the reference feedback period for j-th of band, and t is to feed back the moment with reference to the first of subband, and M is multiple by feedback
The number of band, 2≤M≤N, wherein multiple by feedback subband is that relative position according to each by feedback subband on frequency domain is arranged
Sequence.
In the embodiment of the present invention, at each feedback moment of each subband group, user equipment only feeds back right in its subband group
Answer the subband index and CSI of optimal CSI.It include 2 sons to be measured in each subband group for example, being configured with 3 subband groups in base station
Under the right of band, after user equipment measures subband to be measured, it is only necessary to the CSI of 3 subbands of base station feedback, can further save
Signaling overheads.
By in this present embodiment, the feedback parameter for referring to subband group only being carried in the signaling that base station is transmitted to user equipment,
And user equipment only feeds back the subband index and CSI that optimal CSI is corresponded in each subband group, therefore can reduce opening for signaling
Pin improves communication quality, realizes the purpose of power saving, and base station can be based on the subband of optimal CSI in received each subband group
Index and CSI, for user equipment selection it is optimal or preferably subband carry out signal transmission, so as to improve information transmission can
By property and speed, equally realization power saving.
As an example, base station is 3 downlink subband groups to be measured that user device configuration needs to measure, thus base station to
It is carried in the signaling that family equipment is sent anti-with reference to the corresponding CSI of subband group in the mark and 3 subband groups of 3 subband groups
Feedforward parameter, with the subband in notifying user equipment 3 subband groups and subband group to be measured.
The mark of 3 subband groups for example can be the number (as indexed) of subband group, be existed according to subband in each subband group
Ascending relative position on frequency domain, mobile station and base station can be numbered according to uniform principles for subband group, subband group
In each subband can also carry out second level number.For example, it is #1, #2, #3, this 3 subband groups that 3 subband groups can number respectively
In subband can for example to number respectively be #11, #12, #21, #22, #31, #32, can also using other numbers or identification means,
For example, it is #1, #2, #3, #4, #5, #6 that 6 subbands are numbered respectively, wherein the first two subband can belong to the first subband group, centre 2
A subband can belong to the second subband group, and last 2 subbands can belong to third subband group etc., and the present invention is not limited thereto.With reference to son
Band group, which can be, indexes the smallest subband group in subband group to be measured, such as subband group #1.Alternatively, it can also will sort in subband group
The subband group indicated by the most preceding or last or subband group index of specific position, which is used as, refers to subband group.In this way, base station can be with
In the case where not increasing signaling overheads user terminal is identified with reference to subband group.In addition, base station can also be according to other
Rule selects a subband group for reference to subband group from the subband group to be measured configured, and is allocated to user equipment.At this point,
It is the reference subband group mark with reference to subband group that mark subband group can be also carried in the signaling that base station is sent to user equipment.
Base station only needs to refer to the CSI feedback parameter of subband group, the feedback parameter of other subband groups for user device configuration
(i.e. the feedback parameter for the subband to be fed back in other subband groups) is derived by by the configuration of reference subband group.This makes base station not
It needs to reduce the expense of signaling for each subband group configuration parameter.
The CSI feedback parameter of the reference subband group of base station configuration may include the time and period of CSI feedback, user equipment
After measuring the subband to be measured in each subband group, it may be determined that going out the subband that channel quality is optimal in each subband group is the son to be fed back
Band, the time and period of the CSI feedback of these subbands to be fed back can be according to the times and week of the CSI feedback of reference subband group
Phase is derived by.
One typical example are as follows: for reference subband group, base station configures following feedback parameter:
First feedback moment t: being relative to the 0th frame with reference to the first feedback moment for needing to feed back subband CSI in subband group
The time migration of 0th subframe indicates, as an example, as unit of number of sub frames；And
Feedback cycle p: with reference to the adjacent time interval fed back twice of subband group, as an example, as unit of number of sub frames.
The corresponding feedback cycle of each subband group is identical as with reference to the corresponding feedback cycle of subband group, 3 sons of base station configuration
The first feedback moment with 3 subbands to be feedback in group can be according to the corresponding feedback parameter of reference subband group by formula as above
(2) it obtains.
As an example, sharing 3 subband groups, i.e. subband group #1, subband group #2 and subband group #3, wherein subband group #1 is
With reference to subband group, each subband group is for example including 2 subbands to be measured.With reference to the corresponding feedback parameter of subband group are as follows: the first feedback
Moment t1 is the 4th subframe, feedback cycle p1=30 subframe.According to formula (2), the feedback parameter based on reference subband group can be true
Make: subband group #2 (the 2nd subband group) is corresponding to be fed back the moment for the first time (that is, the first of subband to be feedback anti-in subband group #2
Present the moment) it is the 14th subframe；The moment of feedback for the first time of 3rd subband group #3 is the 24th subframe, with reference to the 2nd feedback of subband group
Moment is the 34th subframe, and second of feedback moment of subband group #2 is the 44th subframe, and the 2nd feedback moment of subband group #3 is the
54 subframes, and so on, as shown in Figure 4.Subband group #2, subband group #3 feedback cycle be p.
In the embodiment, base station carries in 3 subband group marks and 3 subband groups to user equipment transmission and refers to
After the signaling of the CSI feedback parameter of subband group, user equipment receives the signaling, and based on anti-with reference to the corresponding CSI of subband group
Feedforward parameter derives other corresponding CSI feedback parameters of 2 subband groups.User equipment carries out CSI to each subband in subband group
After measurement, for each subband group only subband identities and its CSI optimal to base station feedback channel status.Base station receives each son
The CSI of band, and the CSI based on the subband received select optimal quality or preferably subband from the subband received for user,
And be the selected subband of user device configuration, using optimal or preferably subband is communicated.
In the embodiment of the present invention, not only base station saves signaling and only carrying the CSI feedback parameter for referring to subband group,
User equipment, by only feeding back the CSI of optimal subband, further saves signaling overheads when to base station feedback subband CSI.
In alternative embodiment of the present invention, user equipment can also the CSI feedback parameter based on each subband group to base station
The CSI of two or more subbands optimal in each subband group is fed back, at this point, base station and user equipment can be based on negotiating in advance
Principle determines several subbands of the user equipment into each subband group of base station feedback, and based on ginseng to be feedback in reference subband group
Examine that the CSI feedback parameter of subband, the relative positional relationship of multiple subbands to be feedback is anti-in subband group to determine in each subband group
The CSI feedback parameter for presenting the subband of CSI, more specifically, can equally determine the first of multiple subbands to be feedback based on formula (2)
Feed back the moment.Such as being configured with 2 subband groups altogether, each subband group contains 3 subbands to be measured, from 3 of each subband group
Subband to be measured selects the case where 2 optimal subband feedback CSI parameters, and user equipment receives the notice from base station and to measure
After the signaling of 2 groups of subbands (supplying 6 subbands to be measured), the CSI of 6 subbands to be measured is measured, the CSI measurement result based on each subband
Select 2 optimal subbands for subband to be feedback from every group of subband, and the CSI feedback parameter based on reference subband and to be feedback
The relative positional relationship of subband determines the CSI feedback parameter of each subband to be feedback, and is fed back to base station, and base station is based on feedback
As a result the subband of an optimal quality is selected from the multiple subbands fed back, and is the subband of user device configuration selection.Fig. 5
It show the CSI feedback example of parameters determined in the example, as shown in Figure 5,2 subbands to be feedback and the 2nd in the 1st subband group
1 the 1st feedback moment to be feedback in subband subband group is respectively the 4th subframe, the 14th subframe, the 24th subframe and the 34th son
Frame, the feedback cycle of each subframe to be feedback are 40 subframes.
According to channel state feedback method disclosed above, can not only allow base station be mobile station in selecting it is optimal or
Preferably subband carries out signal transmission, improves the reliability and speed of information transmission, and reduces the expense of signaling, realizes
The power saving of Mobile Terminal.
According to some embodiments of the present disclosure, base station may include memory and processor, and processor is configured as executing
The program code stored on memory, to realize the various embodiments above by reference to channel status transmission method shown in FIG. 1.
Correspondingly, the present invention also provides a kind of channel state feedback methods executed by user equipment side, as shown in fig. 6,
The channel status transmission and communication method of user equipment side the following steps are included:
Step S602: user equipment receives the signaling that base station is sent, and the subband group mark of N number of subband group is carried in the signaling
And/or by the channel state information of a subband being fed back, as reference subband in subband identities and N number of subband group
Feedback parameter.
Each subband group contains one or more subbands in this N number of subband group, and N number of subband group contains altogether multiple sons
Band, N are the integer more than or equal to 1.
Step S604: user equipment measures the channel state information of each subband in N number of subband group, and determination to be fed back it is more
A subband.
In embodiments of the present invention, it can be determined based on the principle of network side (such as base station) and user equipment offered
The CSI of several subbands is fed back in each subband group.
Step S606: it to be fed back based on the corresponding information feedback parameter of reference subband group and determination multiple
The information feedback parameter of subband, wherein the multiple subbands to be fed back include at least one of each subband group
Subband, i.e., subband more than at least one in each subband group will feed back CSI.
Step S608: user equipment is multiple to base station feedback based on determining multiple CSI feedback parameters by feedback subband
By the CSI of feedback subband.
In this step, in the case where in each subband group comprising multiple subbands, at least one of each subband group is fed back
Subband is preferably at least one subband that channel quality is optimal in current sub-band group.
Step S610: user equipment is received the sub-band information of base station configuration and is communicated using the subband with base station.
Base station is that the subband of user device configuration is the optimal or suboptimum that base station is selected from the subband of multiple feedbacks
Subband.
If the execution sequence for the step of in last step, having can be executed or be exchanged parallel, and it is not limited to shown in figure
Sequentially.Such as step S604 and step S606, in the case where not influencing the object of the invention and realizing, can execute parallel or can be with
Order change.
Since Fig. 6 is step that is corresponding from Fig. 1, executing for same downlink channel condition transmission process in different actuating stations
Suddenly, therefore details are not described herein.Based on the channel state feedback method, base station can not only be allowed to be that mobile station in selecting is optimal
Or preferably subband carries out signal transmission, improves the reliability and speed of information transmission, and reduces the expense of signaling, thus
Realize the power saving of Mobile Terminal.
Technical solution of the present invention is applicable not only to Internet of Things (including narrowband Internet of Things), is also equally applicable to traditional interconnection
Net.
In some embodiments of the present disclosure, user equipment may include memory or processor, and processor is configured as
The computer program code stored on memory is executed, to realize the above-mentioned downlink channel condition feedback side referring to described in Fig. 6
The various embodiments of method.
Present disclosure also relates to storage mediums, can store computer program code thereon, when program code is performed
It can be implemented referring to Fig.1 or the various embodiments of downlink channel condition feedback method described in Fig. 6, the storage medium can be
Tangible media, CD, USB flash disk, floppy disk, hard disk etc..
Those of ordinary skill in the art may be aware that being described in conjunction with embodiment disclosed herein each exemplary
Unit and method and step, can be realized with the combination of hardware, software or the two.These functions are actually with hardware or soft
Part mode executes, specific application and design constraint depending on technical solution.Professional technician can be to each spy
Fixed application uses different methods to achieve the described function, but this realizes it is not considered that exceeding model of the invention
It encloses.
The method that describes in conjunction with embodiment disclosed herein can (computer etc. be patrolled with hardware the step of algorithm
Volume device) software that executes realizes.The software when executed, can make the hardware (logic devices such as computer) real
Existing above-mentioned method or its composition step, or the hardware (logic devices such as computer) is made to serve as invention described above
Device feature.
Software can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electric erasable
Any other form of depositing well known in programming ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In storage media.
Embodiments described above is all exemplary, and is not limitation of the present invention, those skilled in the art are according to this
The spirit of invention, it is contemplated that various variants and modifications, these variants and modifications are also within the scope of the invention.
Claims (16)
1. a kind of downlink channel condition feedback method, which is characterized in that method includes the following steps:
Base station sends signaling, the notifying user equipment N number of subband group to be measured, wherein carry in the signaling to user equipment
The subband group of N number of subband group identify and/or subband identities and N number of subband group in by it is being fed back, as reference
The information feedback parameter of one subband of subband, wherein in N number of subband group each subband group contain one or
Multiple subbands and N number of subband group contain altogether multiple subbands, and N is the integer more than or equal to 1；
Base station receives multiple channel state informations by feedback subband of user equipment feedback, wherein the multiple by feedback
Band includes at least one subband in each subband group, for feeding back the letter of the multiple channel state information by feedback subband
Channel state information feedback parameter is that the user equipment is determined based on the information feedback parameter of reference subband.
2. according to the method described in claim 1, wherein, the method also includes:
The channel state information of subband based on user equipment feedback, base station selects a son from the multiple subbands fed back
Band, and be the subband of user device configuration selection, to be communicated.
3. described with reference to the corresponding information feedback parameter packet of subband group according to the method described in claim 1, wherein
It includes:
With reference to the first feedback moment: it is to feed back the moment with reference to one in subband group first with reference to subband to be feedback, with phase
The time migration of the 0th subframe of 0th frame is indicated；And
The reference feedback period: it is with reference to one in the subband group adjacent time interval fed back twice to be feedback with reference to subband；
It is the multiple to include: by the information feedback parameter of feedback subband
By the feedback cycle of feedback subband, be it is each by the adjacent time interval fed back twice of feedback subband, with the ginseng
It is identical to examine feedback cycle；And
The moment is fed back by the first of feedback subband, the moment is fed back by the first of feedback subband to be each, relative to the 0th frame
The time migration of 0th subframe indicates, wherein respectively by feedback subband first feed back the moment be based on described with reference to the first feedback when
It carves, the reference feedback period and to be feedback with reference to subband and currently determined by the relative positional relationship of feedback subband.
4. according to the method described in claim 3, wherein, the multiple by the first feedback moment of feedback subband is based on as follows
What formula determined:
tk=(k-j) × p/M+t；
In formula, tkIt is fed back the moment by k-th in feedback subband by the first of feedback subband to be the multiple, j is as with reference to subband
J-th by feedback subband, p is the reference feedback period, and t is described with reference to the first feedback moment, and M is the multiple anti-
Present the number of subband, wherein the multiple by feedback subband is that relative position according to each by feedback subband on frequency domain is arranged
Sequence.
5. method described in any one of -4 according to claim 1, wherein the method is applied in Internet of Things.
6. method described in any one of -4 according to claim 1, wherein the multiple by feedback subband includes each subband
At least one subband of optimal quality in group.
7. a kind of downlink channel condition feedback method, which is characterized in that method includes the following steps:
User equipment receives the signaling that base station is sent, and the subband group mark and/or subband mark of N number of subband group are carried in the signaling
The information feedback of a subband being fed back, as reference subband is joined in knowledge and N number of subband group
Number, wherein each subband group contains one or more subbands in N number of subband group, and N number of subband group contains altogether multiple sons
Band, N are the integer more than or equal to 1；
User equipment measures the channel state information of each subband in N number of subband group, and based on reference to the corresponding letter of subband group
Multiple information feedback parameters by feedback subband that the determination of channel state information feedback parameter will be fed back, wherein institute
Stating multiple by feedback subband includes at least one subband in each subband group；
User equipment is multiple anti-to base station feedback based on determining multiple information feedback parameters by feedback subband
Present the channel state information of subband.
8. according to the method described in claim 7, wherein, the method also includes:
User equipment receives base station from the information of the multiple subband selected in feedback subband and uses the selection
Subband communicated with base station.
9. according to the method described in claim 7, wherein,
It is described to include: with reference to the corresponding information feedback parameter of subband group
With reference to the first feedback moment: it is to feed back the moment with reference to one in subband group first with reference to subband to be feedback, with phase
The time migration of the 0th subframe of 0th frame is indicated；And
The reference feedback period: it is with reference to one in the subband group adjacent time interval fed back twice to be feedback with reference to subband；
It is the multiple to include: by the information feedback parameter of feedback subband
By the feedback cycle of feedback subband, be it is each by the adjacent time interval fed back twice of feedback subband, with the ginseng
It is identical to examine feedback cycle；
The moment is fed back by the first of feedback subband, the moment is fed back by the first of feedback subband to be each, relative to the 0th frame
The time migration of 0th subframe indicates, wherein respectively by feedback subband first feed back the moment be based on described with reference to the first feedback when
It carves, the reference feedback period and to be feedback with reference to subband and currently determined by the relative positional relationship of feedback subband.
10. according to the method described in claim 9, wherein, the multiple by the first feedback moment of feedback subband is based on such as
What lower formula determined:
tk=(k-j) × p/M+t；
In formula, tkIt is fed back the moment by k-th in feedback subband by the first of feedback subband to be the multiple, j is to join as by feedback
Examine by feedback subband, p is the reference feedback period, and t is described with reference to the first feedback moment, and M is described more j-th of subband
A number by feedback subband, wherein the multiple by feedback subband is opposite on frequency domain by feedback subband according to each
Name placement.
11. method according to any one of claims of claim 7-10, wherein the method is applied in Internet of Things.
12. method according to any one of claims of claim 7-10, wherein the multiple by feedback subband includes each son
At least one subband with optimal quality in group.
13. a kind of base station, which includes memory and processor, is stored on memory the processor is configured to executing
The step of computer program code is to execute the method as described in any one of claim 1-6.
14. a kind of user equipment, which includes processor and memory, the processor is configured to depositing described in executing
The step of computer program code stored on reservoir is to execute the method as described in any one of claim 7-12.
15. a kind of storage medium, is stored thereon with computer program code, realizes in claim 1-6 and appoint when executing the code
Downlink channel condition feedback method described in meaning one.
16. a kind of storage Jie holds, it is stored thereon with computer program code, realizes in claim 7-12 and appoints when executing the code
Downlink channel condition feedback method described in meaning one.
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