CN104579518B - Base station, and method and system for measuring and feeding CSI (channel state information) - Google Patents
Base station, and method and system for measuring and feeding CSI (channel state information) Download PDFInfo
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Abstract
The invention provides a base station, and a method and a system for measuring and feeding CSI (channel state information) when an LTE (long term evolution) system works on unauthorized frequency bands. The method includes detecting current downlink channel states when downlink service arrives, and transmitting CSI measurement configuration signals and CSI feedback configuration signals, which correspond to the current downlink channel states, to terminals according to the current downlink channel states; or transmitting CSI measurement configuration signals and CSI feedback configuration signals, which correspond to specified downlink channel states, to the terminals when the downlink service arrives, and enabling the terminals to measure and feed the CSI according to the CSI measurement configuration signals and the CSI configuration signals, which correspond to the downlink channel states, after the downlink channel states are acquired. According to the technical scheme, the base station, the method and the system have the advantage that the CSI can be effectively assuredly normally measured and fed after LBT (listen before talk) mechanisms are introduced onto the LTE system on the unauthorized frequency bands.
Description
Technical field
The present invention relates to communication technical field, in particular to a kind of LTE system unauthorized
Channel detection method during band operation, a kind of LTE system channel when unauthorized band operation
Detecting system and a kind of base station.
Background technology
Along with sharply increasing of message volume, the mandate frequency spectrum of 3GPP is increasingly not enough to provide more
High network capacity.In order to improve the utilization rate of frequency spectrum resource further, 3GPP just discusses how
Unlicensed spectrum is used, such as 2.4GHz and 5GHz frequency range with the help of authorizing frequency spectrum.These are not awarded
Power frequency spectrum is presently mainly the systems such as Wi-Fi, bluetooth, radar, medical treatment and is using.
Under normal circumstances, for the access technology authorizing frequency range to design, such as LTE (Long Term
Evolution, Long Term Evolution) be not suitable for using in unauthorized frequency range, because this kind of access of LTE
The requirement that spectrum efficiency and Consumer's Experience are optimized by technology is the highest.But, carrier aggregation (Carrier
Aggregation, CA) function allows and LTE is deployed in unauthorized frequency range becomes possible to.3GPP carries
Go out the general of LAA (Licensed Assisted Access, LTE authorize the access that frequency spectrum assists)
Read, authorize by LTE the help of frequency spectrum to use unlicensed spectrum.And unlicensed spectrum can have
Two kinds of working methods, one is to supplement descending (SDL, Supplemental Downlink), i.e. only
There is downlink transfer subframe；Another kind is TDD (Time division duplex, time division duplex) mould
Formula, had both comprised downlink transfer subframe, had also comprised uplink subframe.Supplementing descending this situation can only
It is made by carrier aggregation technology and uses (as shown in Figure 1).And tdd mode is except can be by DC
(Dual Connectivity, doubly-linked leads to) uses, it is also possible to independent use.
Compared to Wi-Fi system, the LTE system being operated in unauthorized frequency range has the ability to provide higher
Spectrum efficiency and bigger coverage effect, be simultaneously based on same core net and allow data traffic authorize frequency range
And seamless switching between unauthorized frequency range.For user, it means that preferably broadband experience, higher
Speed, more preferable stability and mobile convenient.
The existing access technology used in unlicensed spectrum, such as Wi-Fi, has more weak resisting and does
Disturb ability.In order to avoid interference, Wi-Fi system devises a lot of interference and avoids rule, as
(Carrier Sense Multiple Access/Collision Detection, carrier sense is many for CSMA/CD
Road access/collision detection method), the ultimate principle of this method is the AP (Access of Wi-Fi
Point, access point) or terminal before sending signaling or data, around first Monitor detection be
No have other AP or other-end sending/receiving signaling or data, if having, then continues to monitor,
Until listening to not have；If no, then one random number of generation is as back off time, at this
In back off time, if signaling or data transmission not detected, then terminate it at back off time
After, AP or terminal can start to send signaling or data.This process is as shown in Figure 2.
But, owing to there being good orthogonality to ensure that interference level in LTE network, thus base station with
The downstream transmission of user need not consider around whether have other base stations or other users in transmission data.
If whether LTE has other equipment non-in use around the most not considering when using in unauthorized frequency range
Authorize frequency range, then Wi-Fi equipment will be brought interference greatly.As long as because LTE has business just
Be transmitted, there is no any monitoring rule, then Wi-Fi equipment when LTE has business to transmit the most not
Can transmit, can only wait until that LTE business is transmitted, just can detect that channel clear is to carry out
Data are transmitted.
So, LTE network is when using unauthorized frequency range, and one of topmost key point is to ensure that
LAA can coexist with existing access technology (such as Wi-Fi) on the basis of fair close friend.And
The mechanism not having LBT (Listen Before Talk, listem-before-talk) in traditional LTE system is kept away
Exempt from collision.In order to preferably coexist with Wi-Fi system, LTE introduces a kind of LBT mechanism.
As it is shown on figure 3, the LBT detection repetition period is 10ms, LBT detects subframe 1ms.Fig. 3
The LBT of middle period 1 detects channel idle, illustrates that the interference of surrounding is less, then this cycle
In other subframe can be occupied.And the LBT of second period detects channel busy, illustrate around
Disturb the biggest, then in this cycle, other subframe can not be occupied.
In this case, user is for channel quality information (CSI, the Channel state of descending scheduling
Information) how to measure and feed back, being the problem needing to consider.CSI information includes CQI
(Channel quality Indicator, channel quality indicates), (Rank indicator, order refers to RI
Show) and PMI (Precoding matrix indicator, pre-coding matrix indicates).Subject matter bag
Containing following: when (1) starts to measure CSI？(2), when channel status is detected as busy, it is
No needs measures CSI, if needs feedback, and based on what signal measures, and measures the cycle
What is with feedback cycle？(3) when channel status is detected as the free time, if need to measure CSI,
The need of feedback, and based on what signal measuring, measurement cycle and feedback cycle are assorted
?？(4) CSI information in base station the need of renewal？
Therefore, after how guaranteeing that LTE system introduces LBT mechanism in unauthorized frequency range, CSI surveys
Amount and CSI feedback be normally carried out becoming technical problem urgently to be resolved hurrily.
Summary of the invention
The present invention is based on the problems referred to above, it is proposed that a kind of new technical scheme, it can be ensured that LTE
After system introduces LBT mechanism in unauthorized frequency range, CSI measures and being normally carried out of CSI feedback,
Guarantee can obtain alternative CSI information when up-to-date CSI information does not also obtain simultaneously, thus
Enable base station to select more suitably modulation coding mode, improve spectrum efficiency further and channel uses
Rate.
In view of this, an aspect of of the present present invention proposes a kind of LTE system at unauthorized band operation
Time CSI measure and feedback method, for base station side, including: when there being downlink business to arrive, examine
Survey current downlink channel state, and send corresponding to institute to terminal according to described current downlink channel state
The CSI stating current downlink channel state measures configuration signal and CSI feedback configuration signal；Maybe under having
When industry business arrives, send corresponding to specifying the CSI of downlink channel condition to measure configuration signal to terminal
With CSI feedback configuration signal so that described terminal after knowing downlink channel condition according to described descending
CSI corresponding to channel status measures configuration signal and CSI feedback configuration signal carry out CSI measurement and
CSI feedback.
In this technical scheme, when there being downlink business to arrive, and when known downlink channel condition, will
The CSI corresponding with current downlink channel state measures and CSI feedback configuration signal sends to terminal, or
Person, when unknown downlink channel condition, the CSI corresponding with specifying downlink channel condition is measured and
CSI feedback configuration signal send to terminal so that terminal after knowing downlink channel condition according to correspondence
CSI measure and CSI feedback configuration signal carry out CSI measure and CSI detect, so, Ke Yiyou
Effect ground guarantees that LTE system introduces CSI measurement and CSI feedback after LBT mechanism in unauthorized frequency range
Be normally carried out, and then ensure spectrum efficiency and channel utilization rate；Wherein, it is intended that downlink channel condition
Including: down channel busy state or down channel idle condition.
In technique scheme, it is preferable that sending corresponding to described current downlink channel state
CSI measures configuration signal and CSI feedback configuration signal or corresponding to specifying the CSI of downlink channel condition
Before measuring configuration signal and CSI feedback configuration signal, also include: arrange and correspond respectively to descending letter
The CSI of road busy state and down channel idle condition measures configuration signal and CSI feedback configuration letter
Order.
In technique scheme, it is preferable that the CSI corresponding to described down channel busy state surveys
The configuration content of amount configuration signal and CSI feedback configuration signal specifically includes: first indicates described terminal
The signal, a CSI measurement time and frequency location, the CSI that measure for CSI measure week
Phase, the first CSI feedback time and the first CSI feedback cycle；And it is empty corresponding to described down channel
The CSI of not busy state measures the configuration content of configuration signal and CSI feedback configuration signal and specifically includes: the
Two indicate described terminals for signal that CSI measures, the 2nd CSI measure time and frequency location, the
Two CSI measure cycle, the second CSI feedback time and the second CSI feedback cycle.
In this technical scheme, by arranging and downlink channel condition (the busy and descending letter of down channel
Road is idle) corresponding CSI measures configuration signal and CSI feedback configuration signal, and and down channel
CSI corresponding to busy state measure the configuration content of configuration signal and CSI feedback configuration signal include but
It is not limited to: first indicates described terminal for the signal (letter measured for CSI of CSI measurement
Number), a CSI measures time and frequency location, a CSI measures cycle, the first CSI feedback
Time and the first CSI feedback cycle, the CSI corresponding with down channel idle condition measures configuration signal
Include but not limited to the configuration content of CSI feedback configuration signal: second indicates described terminal to be used for
Signal (signal measured for CSI), the 2nd CSI that CSI measures measure time and frequency position
Put, the 2nd CSI measures cycle, the second CSI feedback time and the second CSI feedback cycle, by inciting somebody to action
Downlink channel condition measures with CSI and feedback signaling is corresponding, and configures corresponding main contents, with bright
Really indicate when downlink channel condition difference, if need to measure and feedback CSI, and concrete base
Which information to carry out CSI measurement and feedback in, and then effectively ensure that LTE system is at unauthorized frequency
Introduce CSI after LBT mechanism in section to measure and being normally carried out of CSI feedback.
In technique scheme, it is preferable that described first indicates described terminal to measure for CSI
Signal includes one below or a combination thereof: by the PSS/SSS signal of period 1 transmission, by second week
Phase send CRS signal, by the period 3 send CSI-RS and by the period 4 send
DRS signal；A described CSI measures the time and frequency location is the described first described terminal of instruction
The transmission time of signal measured for CSI and frequency location；A described CSI measurement cycle is more than
Or be equal in described period 1, described second round, described period 3 and described period 4
A big cycle；The described first CSI feedback cycle measures week more than or equal to a described CSI
Phase；And described second indicate described terminal for CSI measure signal include one below or its group
Close: by the period 5 send PSS/SSS signal, by the period 6 send CRS signal, press
The DRS signal that the CSI-RS of the 7th cycle transmission and the 8th cycle of pressing send；Described second
CSI measures time and frequency location and measures, for described 2nd CSI, the instruction described end that configuration signal provides
End is used for subframe numbers and the sub-carrier positions that CSI measures；Described 2nd CSI measure the cycle more than or etc.
Maximum in described period 5, described period 6, described 7th cycle and described 8th cycle
One cycle；The described second CSI feedback cycle measures the cycle more than or equal to described 2nd CSI, its
In, the described period 5 is less than or equal to institute less than or equal to described period 1, described period 6
State second round, described 7th cycle was less than less than or equal to described period 3, described 8th cycle
Or equal to the described period 4, described 2nd CSI measures the cycle and surveys less than or equal to a described CSI
In the amount cycle, the described second CSI feedback cycle is less than or equal to the first CSI feedback cycle and described
First CSI feedback time and described second CSI feedback time include: detecting that up channel is idle
Time feedback, or directly feed back after described CSI measurement terminates.
In technique scheme, it is preferable that corresponding to described down channel busy state and described under
The configuration content that the CSI of row channel clear measures configuration signal and CSI feedback configuration signal is concrete
Including: aperiodicity carries out described CSI and measures and described CSI feedback.
In this technical scheme, the first instruction terminal corresponding with down channel busy state is for CSI
The signal measured includes but not limited to one below or a combination thereof: send by the period 1 (large period)
PSS/SSS (Primary Synchronization Signal, master sync signal/Secondary
Synchronization Signal, auxiliary synchronous signals) signal, send by second round (large period)
CRS (Common Reference Signal, public reference signal) signal, by the period 3
CSI-RS that (large period) sends (Channel State Information-Reference Signal,
Channel state information reference signals) signal and the DRS that sends by the period 4 (large period)
(Discovery Reference Signal finds reference signal) signal, and empty with down channel
Second instruction terminal corresponding to not busy state for the signal that CSI measures include but not limited to one below or
A combination thereof: the PSS/SSS signal that sends by the period 5 (minor cycle), by period 6 (Xiao Zhou
Phase) the CRS signal sent, the CSI-RS sent by the 7th cycle (minor cycle) and by
The DRS signal that eight cycles (minor cycle) send, wherein, the period 1, second round, the 3rd
Cycle and period 4 are incomplete same, period 5, period 6, the 7th cycle and the 8th cycle
Incomplete same, and period 5, period 6, the 7th cycle and the 8th cycle are the least
In or equal to period 1, second round, period 3 and period 4, i.e. can pass through multiple side
Formula informs that terminal carries out CSI measurement and CSI feedback；And down channel busy state and down channel are empty
CSI corresponding to not busy state measures and (CSI measures time and frequency location the time started of feedback
And the 2nd CSI measure time and frequency location) be respectively the signal that instruction terminal measures for CSI
The subframe numbers measured for CSI be given in transmission time and signaling and sub-carrier positions；With descending
Channel busy or CSI feedback cycle corresponding to descending idle condition measure the cycle more than CSI, and CSI
The measurement cycle is respectively greater than or is equal in period 1, second round, period 3 and period 4
A big periodic quantity and maximum in period 5, period 6, the 7th cycle and the 8th cycle
One periodic quantity；And can detect that up channel is idle or the uncertain situation of channel status is entered
Row CSI feedback, i.e. can arbitrarily arrange the CSI feedback time；It is of course also possible to aperiodically enter
Row CSI measures and CSI feedback, when downlink channel condition is known or unknown, by the brightest
Really which signal can carry out CSI measurement and feedback based on, and clear and definite CSI measures and the time of feedback
And the cycle, and then effectively ensure that LTE system introduces CSI after LBT mechanism in unauthorized frequency range
Measurement is normally carried out with CSI feedback.
In technique scheme, it is preferable that it is right to send in described unauthorized frequency range or mandate frequency range
The CSI of down channel busy state described in Ying Yu and described down channel idle condition measures configuration letter
Make, CSI feedback configuration signal and CSI feedback information.
In this technical scheme, the CSI corresponding from different downlink channel condition can be measured configuration
Signaling and CSI feedback configuration signal and terminal need the CSI information of feedback to exist after carrying out CSI measurement
It is transmitted, to improve spectrum efficiency and channel utilization rate in unauthorized frequency range or mandate frequency range.
In technique scheme, it is preferable that when weighing with the fixing cycle in described unauthorized frequency range
When carrying out Channel Detection again, directly send corresponding to institute to described terminal by the way of RRC signaling
The CSI stating down channel busy state or described down channel idle condition measures configuration signal and CSI
Feedback configuration signaling；Maybe when receiving described downlink business, and under carrying out in described unauthorized frequency range
Row Channel Detection when the described down channel free time being detected, according to idle the opening of described down channel
Time beginning and termination time determine that described CSI measures time and frequency location, and are believed by RRC
Make, the mode of MAC signaling and/or DCI signaling sends corresponding to described down channel to described terminal
The CSI of idle condition measures configuration signal and CSI feedback configuration signal.
In this technical scheme, when repeating down channel with the fixing cycle in unauthorized frequency range
During detection (LBT based on FBE (Framed based equipment) mechanism), i.e. channel inspection
The survey time is repeated cyclically appearance, and now CSI measures time and frequency location, such as subframe numbers
It is easier to be indicated to terminal, i.e. by direct RRC (Radio Resource Connection, nothing
Line resource connects) signaling once just can indicate clear, then no matter detects that channel busy can every time
The subframe numbers etc. indicated according to this RRC signaling measures and feeds back；Or, descending when having
Business arrives, and carries out down channel detection in unauthorized frequency range (based on LBE (Load based
Equipment) LBT mechanism), i.e. Channel Detection Time aperiodicity occurs, and in this feelings
There is no Channel Busy times under condition, because if channel busy, just carry out Channel Detection always, then
Only Channel Detection Time and idle time of channel, if channel idle detected, now, base station is only
Can be after channel idle being detected every time, according to initial time and the time of termination of current channel idle
Set a CSI and measure time and frequency location, then by RRC signaling, MAC (Medium
Access control, medium education) signaling or DCI (Downlink control
Indicator, descending control indicates) signaled terminal CSI measures time and frequency location；As
This, it can be ensured that when how CSI being measured time under different LBT mechanism, different channels state
Between and frequency location inform to terminal, and then guarantee that LTE system introduces LBT in unauthorized frequency range
After mechanism, CSI measures and being normally carried out of CSI feedback.
In technique scheme, it is preferable that the adjacent sub-frame after Channel Detection Time sends correspondence
Configuration signal and CSI feedback configuration signal is measured in the CSI of described down channel busy state；Or work as
When the described down channel free time being detected, send channel idle instruction to described terminal, so that described end
End receive the instruction of described channel idle after according to receive corresponding to described down channel idle condition
CSI measures configuration signal and CSI feedback configuration signal carries out described CSI measurement and described CSI is anti-
Feedback.
In this technical scheme, when when no matter, down channel busy will measure CSI, base station can be
Subframe adjacent after Channel Detection Time sends the signal for measuring CSI, and terminal can be at letter
Subframe adjacent after the road detection time measure CSI carrying out feed back (this kind of method be applicable to based on
The LBT mechanism of FBE)；Or, when base station is detected and descending letter detected finishing down channel
During the road free time, immediately send channel idle instruction, so that terminal is after receiving channel idle instruction, horse
On carry out CSI measurement, now, base station is after terminal receives channel idle instruction and can carry out
Send, after time needed for CSI measurement, the signal measured for CSI, namely make terminal just receive
After indicating to channel idle, signal when can make to carry out CSI measurement also in transmission, (fit by this kind of method
For LBT based on FBE and LBE mechanism)；So, it is possible to achieve send out in suitable subframe
Send the instruction signal measured for CSI of terminal, with efficiently reduce when base station detect channel idle it
Rear terminal is measured and feeds back CSI time delay interior during this period of time, makes terminal to measure as soon as possible and instead
Feedback CSI, and then improve spectrum efficiency and channel utilization rate.
In technique scheme, it is preferable that before receiving described CSI feedback, use storage
The CSI information of adjacent time of described terminal feedback as current CSI information, or use minimum
Modulation coding mode, or use according to the RRM measurement result of the community belonging to described base station,
The RRM measurement result of other communities adjacent with described community and described other adjacent communities
The current CSI information that channel busy or on off state determine；And described use storage described terminal
The CSI information of the adjacent time of feedback specifically includes as current CSI information: when described adjacent time
The CSI information that CSI information is channel busy state time, believe according to the CSI of described adjacent time
RSSI information when ceasing the Channel Detection corresponding with the CSI information of described adjacent time and current
RSSI information during described Channel Detection determines described current CSI information；Or when described adjacent time
The CSI information that CSI information is down channel busy state time, according to the community belonging to described base station
RSRP information and presently described Channel Detection time RSSI information determine that described current CSI believes
Breath.
In this technical scheme, before receiving the up-to-date measurement of terminal the CSI that feeds back, base station can
To obtain current CSI information (alternative CSI information) by following several method, including: adopt
With the CSI information of the adjacent time of the terminal feedback of base station stored (the last CSI information),
Or RRM (Radio resource management, the Radio Resource of the community belonging to employing base station
Management) the RRM measurement result of other communities that measurement result is adjacent with this community and adjacent
The channel busy of other communities or on off state determine current CSI information, such as current CSI information=
The RSRP of current area (community belonging to base station) (Reference signal receiving power,
Reference Signal Received Power)/(community being in open state stronger around the RSRP+ of current area
RSRP)；So, base station can be enable to select more suitably modulation coding mode, or adopt
With minimum modulation coding mode.
Wherein, use the CSI information of adjacent time of the terminal feedback of base station stored as current CSI
Information specifically includes: if recent interval time is shorter, and is down channel idle condition
CSI information；If recent interval time is shorter, and it it is down channel busy state
CSI information, then according to adjacent CSI information (old CSI information) and corresponding channel
(Received signal strength indication, the signal intensity of reception refers to RSSI during detection
Show) information, the RSSI information (new RSSI information) when detecting in conjunction with present channel determines currently
CSI information, such as, the CSI of current CSI information=(RSSI that new RSSI/ is old) × old, or
Person uses RSSI information during RSRP information and the present channel detection of the community belonging to base station to determine
Current CSI information, the RSRP/ of such as current community belonging to CSI information=base station is new
RSSI。
Propose a kind of LTE system according to a further aspect in the invention when unauthorized band operation
CSI measures and feedback system, for base station side, including: control unit, for when there be downlink business
During arrival, control detection current downlink channel state, and control according to described current downlink channel state
Send the CSI corresponding to described current downlink channel state to terminal and measure configuration signal and CSI feedback
Configuration signal, or for when there being downlink business to arrive, control to send corresponding to specifying descending to terminal
The CSI of channel status measures configuration signal and CSI feedback configuration signal, so that described terminal is being known
Measure configuration signal according to the CSI that described downlink channel condition is corresponding after downlink channel condition and CSI is anti-
Feedback configuration signal carries out CSI measurement and CSI feedback.
In this technical scheme, when there being downlink business to arrive, and when known downlink channel condition, will
The CSI corresponding with current downlink channel state measures and CSI feedback configuration signal sends to terminal, or
Person, when unknown downlink channel condition, the CSI corresponding with specifying downlink channel condition is measured and
CSI feedback configuration signal send to terminal so that terminal after knowing downlink channel condition according to correspondence
CSI measure and CSI feedback configuration signal carry out CSI measure and CSI detect, so, Ke Yiyou
Effect ground guarantees that LTE system introduces CSI measurement and CSI feedback after LBT mechanism in unauthorized frequency range
Be normally carried out, and then ensure spectrum efficiency and channel utilization rate；Wherein, it is intended that downlink channel condition
Including: down channel busy state or down channel idle condition.
In technique scheme, it is preferable that also include: unit is set, for send corresponding to
The CSI of described current downlink channel state measures configuration signal and CSI feedback configuration signal or corresponds to
Before the CSI specifying downlink channel condition measures configuration signal and CSI feedback configuration signal, arrange and divide
Not Dui Yingyu the CSI of down channel busy state and down channel idle condition measure configuration signal and
CSI feedback configuration signal.
In technique scheme, it is preferable that described arrange unit specifically for: arrange corresponding to institute
The CSI stating down channel busy state measures configuration signal and the configuration content of CSI feedback configuration signal
Specifically include: first indicate described terminal for CSI measure signal, the oneth CSI measure the time and
Frequency location, a CSI measure cycle, the first CSI feedback time and the first CSI feedback cycle；
And the CSI corresponding to described down channel idle condition is set measures configuration signal and CSI feedback and join
The configuration content of confidence order specifically includes: second indicate described terminal for signal that CSI measures, the
Two CSI measure times and frequency location, the 2nd CSI measures the cycle, the second CSI feedback time and the
Two CSI feedback cycles.
In this technical scheme, by arranging and downlink channel condition (the busy and descending letter of down channel
Road is idle) corresponding CSI measures configuration signal and CSI feedback configuration signal, and and down channel
CSI corresponding to busy state measure the configuration content of configuration signal and CSI feedback configuration signal include but
It is not limited to: first indicates described terminal for the signal (letter measured for CSI of CSI measurement
Number), a CSI measures time and frequency location, a CSI measures cycle, the first CSI feedback
Time and the first CSI feedback cycle, the CSI corresponding with down channel idle condition measures configuration signal
Include but not limited to the configuration content of CSI feedback configuration signal: second indicates described terminal to be used for
Signal (signal measured for CSI), the 2nd CSI that CSI measures measure time and frequency position
Put, the 2nd CSI measures cycle, the second CSI feedback time and the second CSI feedback cycle, by inciting somebody to action
Downlink channel condition measures with CSI and feedback signaling is corresponding, and configures corresponding main contents, with bright
Really indicate when downlink channel condition difference, if need to measure and feedback CSI, and concrete base
Which information to carry out CSI measurement and feedback in, and then effectively ensure that LTE system is at unauthorized frequency
Introduce CSI after LBT mechanism in section to measure and being normally carried out of CSI feedback.
In technique scheme, it is preferable that the described unit that arranges specifically is additionally operable to: arrange described
One signal indicating described terminal to measure for CSI includes one below or a combination thereof: by the period 1
Send PSS/SSS signal, by second round send CRS signal, by the period 3 send
CSI-RS and the DRS signal sent by the period 4；A described CSI is set and measures the time
With the transmission time that frequency location is the described first signal indicating described terminal to measure for CSI and frequency
Rate position；Arrange described oneth CSI measure the cycle more than or equal to the described period 1, described second
A cycle maximum in cycle, described period 3 and described period 4；Arrange described first
The CSI feedback cycle measures the cycle more than or equal to a described CSI；And described second instruction is set
Described terminal includes one below or a combination thereof for the signal that CSI measures: by period 5 transmission
PSS/SSS signal, by the period 6 send CRS signal, by the 7th the cycle send CSI-RS
Signal and the DRS signal sent by the 8th cycle；Described 2nd CSI is set and measures time and frequency
The described terminal that indicates that position is measured configuration signal for described 2nd CSI and provided is used for the son that CSI measures
Frame number and sub-carrier positions；Described 2nd CSI is set and measures the cycle more than or equal to described 5th week
A cycle maximum in phase, described period 6, described 7th cycle and described 8th cycle；If
Put the described second CSI feedback cycle to measure the cycle more than or equal to described 2nd CSI, wherein, described
Period 5 is less than or equal to described second week less than or equal to described period 1, described period 6
Phase, described 7th cycle are less than or equal to institute less than or equal to described period 3, described 8th cycle
Stating the period 4, described 2nd CSI measures the cycle and measures the cycle less than or equal to a described CSI,
The described second CSI feedback cycle was less than or equal to for the first CSI feedback cycle, and arranged described first
CSI feedback time and described second CSI feedback time include: anti-when the up channel free time being detected
Feedback, or directly feed back after described CSI measurement terminates.
In technique scheme, it is preferable that the described unit that arranges specifically is additionally operable to: arrange corresponding to
The CSI of described down channel busy state and described down channel idle condition measure configuration signal and
The configuration content of CSI feedback configuration signal specifically includes: aperiodicity carries out described CSI measurement and institute
State CSI feedback.
In this technical scheme, the first instruction terminal corresponding with channel busy state is measured for CSI
Signal include but not limited to one below or a combination thereof: send by the period 1 (large period)
PSS/SSS (Primary Synchronization Signal, the main synchronization that PSS was sent by the period 1
Signal/Secondary Synchronization Signal, auxiliary synchronous signals) signal, by second round
CRS (Common Reference Signal, the public reference signal) letter that (large period) sends
Number, CSI-RS (the Channel State Information-that sends by the period 3 (large period)
Reference Signal, channel state information reference signals) signal and by the period 4 (large period)
DRS (Discovery Reference Signal the finds reference signal) signal sent, Yi Jiyu
Down channel idle condition corresponding second instruction terminal for CSI measure signal include but not limited to
One below or a combination thereof: the PSS/SSS signal that sends by the period 5 (minor cycle), by the 6th
CRS signal that cycle (minor cycle) sends, the CSI-RS sent by the 7th cycle (minor cycle)
Signal and the DRS signal sent by the 8th cycle (minor cycle), wherein, period 1, second
Cycle, period 3 and period 4 are incomplete same, period 5, period 6, the 7th cycle
Incomplete same with the 8th cycle, and period 5, period 6, the 7th cycle and the 8th cycle phase
It is respectively less than or equal to period 1, second round, period 3 and period 4 with answering, the most permissible
Inform that terminal carries out CSI measurement and CSI feedback in several ways；And down channel busy state and
CSI corresponding to down channel idle condition measures and (CSI measures the time time started of feedback
Time and frequency location is measured with frequency location and the 2nd CSI) it is respectively instruction terminal for CSI survey
The subframe numbers measured for CSI be given in the transmission time of the signal of amount and signaling and subcarrier position
Put；CSI feedback cycle corresponding to or descending idle condition busy with down channel measures week more than CSI
Phase, and CSI measures the cycle and is respectively greater than or equal to period 1, second round, period 3 and the
One periodic quantity of the interim maximum of surrounding and period 5, period 6, the 7th cycle and the 8th week
One periodic quantity of interim maximum；And can detect that up channel is idle or channel status is the most true
Fixed situation carries out CSI feedback, i.e. can arbitrarily arrange the CSI feedback time；It is of course also possible to it is non-
Periodically carry out CSI measurement and CSI feedback, when channel status is known or unknown, by right
Clearly which signal should can carry out CSI measurement and feedback based in ground, and clear and definite CSI measures and feedback
Time and the cycle, and then effectively ensure that LTE system introduce in unauthorized frequency range LBT mechanism
Rear CSI measurement is normally carried out with CSI feedback.
In technique scheme, it is preferable that described control unit specifically for: control described non-
Authorize and send corresponding to described down channel busy state and described down channel in frequency range or mandate frequency range
The CSI of idle condition measures configuration signal and CSI feedback configuration signal and CSI feedback information.
In this technical scheme, the CSI corresponding from different downlink channel condition can be measured configuration
Signaling and CSI feedback configuration signal and terminal need the CSI information of feedback to exist after carrying out CSI measurement
It is transmitted, to improve spectrum efficiency and channel utilization rate in unauthorized frequency range or mandate frequency range.
In technique scheme, it is preferable that described control unit is specifically additionally operable to: when described non-
When repeating Channel Detection with the fixing cycle in mandate frequency range, control the side by RRC signaling
Formula directly sends corresponding to described down channel busy state or described down channel idle to described terminal
The CSI of state measures configuration signal and CSI feedback configuration signal；Maybe when receiving described lower industry
Business, and in described unauthorized frequency range, carry out down channel detection and detecting that described down channel is empty
Idle, controls the time started idle according to described down channel and the termination time determines that described CSI surveys
Amount time and frequency location, and to institute by the way of RRC signaling, MAC signaling or DCI signaling
State terminal and send the CSI measurement configuration signal corresponding to described down channel idle condition and CSI feedback
Configuration signal.
In this technical scheme, when repeating down channel with the fixing cycle in unauthorized frequency range
During detection (LBT based on FBE (Framed based equipment) mechanism), i.e. channel inspection
The survey time is repeated cyclically appearance, and now CSI measures time and frequency location, such as subframe numbers
It is easier to be indicated to terminal, i.e. by direct RRC (Radio Resource Connection, nothing
Line resource connects) signaling once just can indicate clear, then no matter detects that channel busy can every time
The subframe numbers etc. indicated according to this RRC signaling measures and feeds back；Or, descending when having
Business arrives, and carries out down channel detection in unauthorized frequency range (based on LBE (Load based
Equipment) LBT mechanism), i.e. Channel Detection Time aperiodicity occurs, and in this feelings
There is no Channel Busy times under condition, because if channel busy, just carry out Channel Detection always, then
Only Channel Detection Time and idle time of channel, if channel idle detected, now, base station is only
Can be after channel idle being detected every time, according to initial time and the time of termination of current channel idle
Set a CSI and measure time and frequency location, then by RRC signaling, MAC (Medium
Access control, medium education) signaling or DCI (Downlink control
Indicator, descending control indicates) signaled terminal CSI measures time and frequency location, as
This, it can be ensured that when how CSI being measured time under different LBT mechanism, different channels state
Between and frequency location inform to terminal, and then guarantee that LTE system introduces LBT in unauthorized frequency range
After mechanism, CSI measures and being normally carried out of CSI feedback.
In technique scheme, it is preferable that described control unit is specifically additionally operable to: control at channel
Adjacent sub-frame after the detection time sends the CSI corresponding to described down channel busy state and measures configuration
Signaling and CSI feedback configuration signal；Maybe when the described down channel free time being detected, control to described
Terminal sends channel idle instruction, so that described terminal receives after described channel idle indicates according to reception
The CSI corresponding to described down channel idle condition arrived measures configuration signal, CSI feedback configuration letter
Order carries out described CSI measurement and described CSI feedback.
In this technical scheme, when when no matter, down channel busy will measure CSI, base station can be
Subframe adjacent after Channel Detection Time sends the signal for measuring CSI, and terminal can be at letter
Subframe adjacent after the road detection time measure CSI carrying out feed back (this kind of method be applicable to based on
The LBT mechanism of FBE)；Or, when base station is detected and descending letter detected finishing down channel
During the road free time, immediately send channel idle instruction, so that terminal is after receiving channel idle instruction, horse
On carry out CSI measurement, now, base station is after terminal receives channel idle instruction and can carry out
Send, after time needed for CSI measurement, the signal measured for CSI, namely make terminal just receive
After indicating to channel idle, signal when can make to carry out CSI measurement also in transmission, (fit by this kind of method
For LBT based on FBE and LBE mechanism)；So, it is possible to achieve send out in suitable subframe
Send the instruction signal measured for CSI of terminal, with efficiently reduce when base station detect channel idle it
Rear terminal is measured and feeds back CSI time delay interior during this period of time, makes terminal to measure as soon as possible and instead
Feedback CSI, and then improve spectrum efficiency and channel utilization rate.
In technique scheme, it is preferable that described control unit is additionally operable to: described receiving
Before CSI feedback, control to use the CSI information conduct of the adjacent time of the described terminal feedback of storage
Current CSI information, or control to use minimum modulation coding mode, or control to use according to institute
State the RRM of the RRM measurement result of community belonging to base station other communities adjacent with described community
The current CSI that measurement result and the channel busy of described other adjacent communities or on off state determine
Information；And the described CSI information conduct of adjacent time controlling to use the described terminal feedback of storage
Current CSI information specifically includes: when the CSI information of described adjacent time is channel busy state
During CSI information, control the CSI information according to described adjacent time and the CSI of described adjacent time
RSSI information when RSSI information during Channel Detection corresponding to information and presently described Channel Detection
Determine described current CSI information；Or when the CSI information of described adjacent time is the busy shape of down channel
During the CSI information of state, according to RSRP information and the presently described channel of the community belonging to described base station
RSSI information during detection determines described current CSI information.
In this technical scheme, before receiving the up-to-date measurement of terminal the CSI that feeds back, base station can
To obtain current CSI information (alternative CSI information) by following several method, including: adopt
With the CSI information of the adjacent time of the terminal feedback of base station stored (the last CSI information),
Or RRM (Radio resource management, the Radio Resource of the community belonging to employing base station
Management) the RRM measurement result of other communities that measurement result is adjacent with this community and adjacent
The channel busy of other communities or on off state determine current CSI information, such as current CSI information=
The RSRP of current area (community belonging to base station) (Reference signal receiving power,
Reference Signal Received Power)/(community being in open state stronger around the RSRP+ of current area
RSRP)；So, base station can be enable to select more suitably modulation coding mode, or adopt
With minimum modulation coding mode.
Wherein, use the CSI information of adjacent time of the terminal feedback of base station stored as current CSI
Information specifically includes: if recent interval time is shorter, and is down channel idle condition
CSI information；If recent interval time is shorter, and it it is down channel busy state
CSI information, then according to adjacent CSI information (old CSI information) and corresponding channel
(Received signal strength indication, the signal intensity of reception refers to RSSI during detection
Show) information, the RSSI information (new RSSI information) when detecting in conjunction with present channel determines currently
CSI information, such as, the CSI of current CSI information=(RSSI that new RSSI/ is old) × old, or
Person uses RSSI information during RSRP information and the present channel detection of the community belonging to base station to determine
Current CSI information, the RSRP/ of such as current community belonging to CSI information=base station is new
RSSI。
According to another aspect of the invention, it is proposed that a kind of base station, including as above any one technical side
The LTE system described in the case CSI when unauthorized band operation measures and feedback system.
In this technical scheme, base station is by this LTE system CSI when unauthorized band operation
Measure and feedback system, when there being downlink business to arrive, and when known downlink channel condition, will with ought
The CSI that front downlink channel condition is corresponding measures and CSI feedback configuration signal sends to terminal, or,
When unknown downlink channel condition, the CSI corresponding with specifying downlink channel condition is measured and CSI is anti-
Feedback configuration signal sends to terminal so that terminal after knowing downlink channel condition according to corresponding CSI
Measure and CSI feedback configuration signal carries out CSI and measures and CSI detection, so, can be the most true
That protects that LTE system introduces in unauthorized frequency range that CSI after LBT mechanism measures with CSI feedback is normal
Carry out, guarantee to obtain alternative CSI letter when up-to-date CSI information does not also obtain simultaneously
Breath so that base station can select more suitably modulation coding mode, improve further spectrum efficiency and
Channel utilization rate.
Pass through technical scheme, it can be ensured that LTE system introduces in unauthorized frequency range
After LBT mechanism, CSI measures and being normally carried out of CSI feedback, and guarantees at up-to-date CSI letter simultaneously
Breath can obtain alternative CSI information, so that base station can select more suitably when also not obtaining
Modulation coding mode, improves spectrum efficiency and channel utilization rate further.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of two kinds of working methods of unlicensed spectrum；
Fig. 2 shows that the schematic diagram of rule is avoided in the interference of Wi-Fi system；
Fig. 3 shows the schematic diagram of the LBT frame structure in LTE；
Fig. 4 shows that LTE system according to an embodiment of the invention is when unauthorized band operation
CSI measures and the schematic flow sheet of feedback method；
Fig. 5 shows that LTE system according to an embodiment of the invention is when unauthorized band operation
CSI instrumentation plan under LBT mechanism based on frame structure；
Fig. 6 shows that LTE system according to an embodiment of the invention is when unauthorized band operation
CSI instrumentation plan under LBT mechanism based on load (data service)；
Fig. 7 shows that channel busy according to an embodiment of the invention all measures the time delay signal of CSI
Figure；
Fig. 8 measures the time delay signal of CSI when showing channel idle according to an embodiment of the invention
Figure；
Fig. 9 shows that LTE system according to an embodiment of the invention is when unauthorized band operation
CSI measures and the structural representation of feedback system；
Figure 10 shows the structural representation of base station according to an embodiment of the invention.
Detailed description of the invention
In order to the above-mentioned purpose of the present invention, feature and advantage can be more clearly understood that, below in conjunction with attached
The present invention is further described in detail by figure and detailed description of the invention.It should be noted that not
In the case of conflict, the feature in embodiments herein and embodiment can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention, but,
The present invention can implement to use other to be different from other modes described here, therefore, and the present invention
Protection domain do not limited by following public specific embodiment.
Fig. 4 shows that LTE system according to an embodiment of the invention is when unauthorized band operation
CSI measures and the schematic flow sheet of feedback method.
As shown in Figure 4, according to an embodiment of the invention LTE system when unauthorized band operation
CSI measure and feedback method, for base station side, including step 402, arrive when there being downlink business
When reaching, detect current downlink channel state, and send to terminal according to described current downlink channel state
CSI corresponding to described current downlink channel state measures configuration signal and CSI feedback configuration signal；
Maybe when there being downlink business to arrive, send corresponding to specifying the CSI of downlink channel condition to measure to terminal
Configuration signal and CSI feedback configuration signal, so that described terminal basis after knowing downlink channel condition
The CSI that described downlink channel condition is corresponding measures configuration signal and CSI feedback configuration signal carries out CSI
Measure and CSI feedback.
In this technical scheme, when there being downlink business to arrive, and when known downlink channel condition, will
The CSI corresponding with current downlink channel state measures and CSI feedback configuration signal sends to terminal, or
Person, when unknown downlink channel condition, the CSI corresponding with specifying downlink channel condition is measured and
CSI feedback configuration signal send to terminal so that terminal after knowing downlink channel condition according to correspondence
CSI measure and CSI feedback configuration signal carry out CSI measure and CSI detect, so, Ke Yiyou
Effect ground guarantees that LTE system introduces CSI measurement and CSI feedback after LBT mechanism in unauthorized frequency range
Be normally carried out, and then ensure spectrum efficiency and channel utilization rate；Wherein, it is intended that downlink channel condition
Including: down channel busy state or down channel idle condition.
In technique scheme, it is preferable that sending corresponding to described current downlink channel state
CSI measures configuration signal and CSI feedback configuration signal or corresponding to specifying the CSI of downlink channel condition
Before measuring configuration signal and CSI feedback configuration signal, also include: arrange and correspond respectively to descending letter
The CSI of road busy state and down channel idle condition measures configuration signal and CSI feedback configuration letter
Order.
In technique scheme, it is preferable that the CSI corresponding to described down channel busy state surveys
The configuration content of amount configuration signal and CSI feedback configuration signal specifically includes: first indicates described terminal
The signal, a CSI measurement time and frequency location, the CSI that measure for CSI measure week
Phase, the first CSI feedback time and the first CSI feedback cycle；And it is empty corresponding to described down channel
The CSI of not busy state measures the configuration content of configuration signal and CSI feedback configuration signal and specifically includes: the
Two indicate described terminals for signal that CSI measures, the 2nd CSI measure time and frequency location, the
Two CSI measure cycle, the second CSI feedback time and the second CSI feedback cycle.
In this technical scheme, by arranging and downlink channel condition (the busy and descending letter of down channel
Road is idle) corresponding CSI measures configuration signal and CSI feedback configuration signal, and and channel busy
CSI corresponding to state measures the configuration content of configuration signal and CSI feedback configuration signal and includes but do not limit
In: first indicate described terminal for signal (signal measured for CSI) that CSI measures, the
One CSI measures time and frequency location, a CSI measures the cycle, the first CSI feedback time and the
In one CSI feedback cycle, the CSI corresponding with down channel idle condition measures configuration signal and CSI is anti-
The configuration content of feedback configuration signal includes but not limited to: second indicates described terminal to measure for CSI
Signal (signal measured for CSI), the 2nd CSI measure time and frequency location, the 2nd CSI
Measurement cycle, the second CSI feedback time and the second CSI feedback cycle, by by downlink channel condition
Measure with CSI and feedback signaling is corresponding, and configure corresponding main contents, to explicitly indicate instantly
During row channel status difference, if need to measure and feedback CSI, and be specifically based on which information and enter
Row CSI measures and feedback, and then effectively ensures that LTE system introduces LBT in unauthorized frequency range
After mechanism, CSI measures and being normally carried out of CSI feedback.
In technique scheme, it is preferable that described first indicates described terminal to measure for CSI
Signal includes one below or a combination thereof: by the PSS/SSS signal of period 1 transmission, by second week
Phase send CRS signal, by the period 3 send CSI-RS and by the period 4 send
DRS signal；A described CSI measures the time and frequency location is the described first described terminal of instruction
The transmission time of signal measured for CSI and frequency location；A described CSI measurement cycle is more than
Or be equal in described period 1, described second round, described period 3 and described period 4
A big cycle；The described first CSI feedback cycle measures week more than or equal to a described CSI
Phase；And described second indicate described terminal for CSI measure signal include one below or its group
Close: by the period 5 send PSS/SSS signal, by the period 6 send CRS signal, press
The DRS signal that the CSI-RS of the 7th cycle transmission and the 8th cycle of pressing send；Described second
CSI measures time and frequency location and measures, for described 2nd CSI, the instruction described end that configuration signal provides
End is used for subframe numbers and the sub-carrier positions that CSI measures；Described 2nd CSI measure the cycle more than or etc.
Maximum in described period 5, described period 6, described 7th cycle and described 8th cycle
One cycle；The described second CSI feedback cycle measures the cycle more than or equal to described 2nd CSI, its
In, the described period 5 is less than or equal to institute less than or equal to described period 1, described period 6
State second round, described 7th cycle was less than less than or equal to described period 3, described 8th cycle
Or equal to the described period 4, described 2nd CSI measures the cycle and surveys less than or equal to a described CSI
In the amount cycle, the described second CSI feedback cycle is less than or equal to the first CSI feedback cycle and described
First CSI feedback time and described second CSI feedback time include: detecting that up channel is idle
Time feedback, or directly feed back after described CSI measurement terminates.
In technique scheme, it is preferable that corresponding to described down channel busy state and described under
The configuration content that the CSI of row channel clear measures configuration signal and CSI feedback configuration signal is concrete
Including: aperiodicity carries out described CSI and measures and described CSI feedback.
In this technical scheme, the first instruction terminal corresponding with down channel busy state is for CSI
The signal measured includes but not limited to one below or a combination thereof: send by the period 1 (large period)
PSS send by the period 1 PSS/SSS (Primary Synchronization Signal, main with
Step signal/Secondary Synchronization Signal, auxiliary synchronous signals) signal, by second round
CRS (Common Reference Signal, the public reference signal) letter that (large period) sends
Number, by the period 3 send CSI-RS (Channel State Information-Reference
Signal, channel state information reference signals) signal and the DRS that sends by the period 4
(Discover Reference Signal finds reference signal) signal, and idle with down channel
State corresponding second instruction terminal for CSI measure signal include but not limited to one below or its
Combination: the PSS/SSS signal that sends by the period 5 (minor cycle), by period 6 (Xiao Zhou
Phase) the CRS signal sent, the CSI-RS sent by the 7th cycle (minor cycle) and by
The DRS signal that eight cycles (minor cycle) send, wherein, the period 1, second round, the 3rd
Cycle and period 4 are incomplete same, period 5, period 6, the 7th cycle and the 8th cycle
Incomplete same, and period 5, period 6, the 7th cycle and the 8th cycle are the least
In or equal to period 1, second round, period 3 and period 4, i.e. can pass through multiple side
Formula informs that terminal carries out CSI measurement and CSI feedback；And down channel busy state and down channel are empty
CSI corresponding to not busy state measures and (CSI measures time and frequency location the time started of feedback
And the 2nd CSI measure time and frequency location) be respectively the signal that instruction terminal measures for CSI
The subframe numbers measured for CSI be given in transmission time and signaling and sub-carrier positions；With descending
Channel busy or CSI feedback cycle corresponding to idle condition measure the cycle more than CSI, and CSI measures
Cycle is respectively greater than or equal to maximum in period 1, second round, period 3 and period 4
One periodic quantity and one maximum in period 5, period 6, the 7th cycle and the 8th cycle
Periodic quantity；And can detect that up channel is idle or the uncertain situation of channel status is carried out
CSI feedback, i.e. can arbitrarily arrange the CSI feedback time；It is of course also possible to aperiodically carry out
CSI measures and CSI feedback, when downlink channel condition is known or unknown, by the clearest and the most definite
Which signal can carry out CSI measurement and feedback based on, and clear and definite CSI measures and the time of feedback and
Cycle, and then effectively ensure that LTE system introduces CSI survey after LBT mechanism in unauthorized frequency range
Amount is normally carried out with CSI feedback.
In technique scheme, it is preferable that it is right to send in described unauthorized frequency range or mandate frequency range
The CSI of down channel busy state described in Ying Yu and described down channel idle condition measures configuration letter
Make, CSI feedback configuration signal and CSI feedback information.
In this technical scheme, the CSI corresponding from different downlink channel condition can be measured configuration
Signaling and CSI feedback configuration signal and terminal need the CSI information of feedback to exist after carrying out CSI measurement
It is transmitted, to improve spectrum efficiency and channel utilization rate in unauthorized frequency range or mandate frequency range.
Fig. 5 shows that LTE system according to an embodiment of the invention is when unauthorized band operation
CSI instrumentation plan under LBT mechanism based on frame structure.
Fig. 6 shows and repeats to arrange Channel Detection by the fixed test cycle according to an embodiment of the invention
The schematic diagram of the frame structure of time.
In technique scheme, it is preferable that when weighing with the fixing cycle in described unauthorized frequency range
When carrying out Channel Detection again, directly send corresponding to institute to described terminal by the way of RRC signaling
State down channel busy state or described down channel idle condition state CSI measure configuration signal and
CSI feedback configuration signal；Maybe when receiving described downlink business and enterprising in described unauthorized frequency range
Row down channel detects and when the described down channel free time being detected, idle according to described down channel
Time started and the termination time determine that described CSI measures time and frequency location, and pass through RRC
The mode of signaling, MAC signaling and/or DCI signaling sends corresponding to described descending letter to described terminal
The CSI of road idle condition measures configuration signal and CSI feedback configuration signal.
In this technical scheme, when repeating down channel with the fixing cycle in unauthorized frequency range
During detection (LBT based on FBE (Framed based equipment) mechanism), such as Fig. 5 institute
Show, i.e. Channel Detection Time is repeated cyclically appearance, and now CSI measures time and frequency position
Putting, such as subframe numbers is easier to be indicated to terminal, i.e. by direct RRC (Radio Resource
Connection, Radio Resource connects) signaling once just can indicate clear, then every time regardless of detecting
Can measure according to the subframe numbers etc. that this RRC signaling indicates and feed back to channel busy；
Or, when there being downlink business to arrive, and carry out in unauthorized frequency range down channel detection (based on
The LBT mechanism of LBE (Load based equipment)), i.e. Channel Detection Time aperiodicity
Occur, as shown in Figure 6, and there is no Channel Busy times in this case, because if channel is numerous
Busy, just carry out Channel Detection, then only Channel Detection Time and idle time of channel always, if inspection
When measuring channel idle, now, base station can only be after detecting channel idle every time, according to specifically
The initial time of channel idle and the time of termination set a CSI and measure time and frequency location, then
By RRC signaling, MAC (Medium access control, medium education) signaling or
DCI (Downlink control indicator, descending control indicates) signaled terminal CSI is measured
Time and frequency location；So, it can be ensured that under different LBT mechanism, different channels state
Time how CSI is measured the time and frequency location is informed to terminal, and then guarantee that LTE system is non-
CSI after introducing LBT mechanism in frequency range is authorized to measure and being normally carried out of CSI feedback.
Fig. 7 shows that channel busy according to an embodiment of the invention all measures the time delay signal of CSI
Figure.
Fig. 8 measures the time delay signal of CSI when showing channel idle according to an embodiment of the invention
Figure.
In technique scheme, it is preferable that the adjacent sub-frame after Channel Detection Time sends correspondence
Configuration signal and CSI feedback configuration signal is measured in the CSI of described down channel busy state；Or work as
When the described down channel free time being detected, send channel idle instruction to described terminal, so that described end
End receive the instruction of described channel idle after according to receive corresponding to described down channel idle condition
CSI measures configuration signal and CSI feedback configuration signal carries out described CSI measurement and described CSI is anti-
Feedback.
In this technical scheme, when when no matter, down channel busy will measure CSI, base station can be
Subframe adjacent after Channel Detection Time sends the signal for measuring CSI, and terminal can be at letter
Subframe adjacent after the road detection time measure CSI carrying out feed back (this kind of method be applicable to based on
The LBT mechanism of FBE)；Or, when base station is detected and descending letter detected finishing down channel
During the road free time, immediately send channel idle instruction, so that terminal is after receiving channel idle instruction, horse
On carry out CSI measurement, now, base station is after terminal receives channel idle instruction and can carry out
Send, after time needed for CSI measurement, the signal measured for CSI, namely make terminal just receive
After indicating to channel idle, signal when can make to carry out CSI measurement also in transmission, (fit by this kind of method
For LBT based on FBE and LBE mechanism)；So, it is possible to achieve send out in suitable subframe
Send the instruction signal measured for CSI of terminal, with efficiently reduce when base station detect channel idle it
Rear terminal is measured and feeds back CSI time delay interior during this period of time, makes terminal to measure as soon as possible and instead
Feedback CSI, and then improve spectrum efficiency and channel utilization rate, as shown in Figure 7 and Figure 8.
In technique scheme, it is preferable that before receiving described CSI feedback, use storage
The CSI information of adjacent time of described terminal feedback as current CSI information, or use minimum
Modulation coding mode, or use according to the RRM measurement result of the community belonging to described base station,
The RRM measurement result of other communities adjacent with described community and described other adjacent communities
The current CSI information that channel busy or on off state determine；And described use storage described terminal
The CSI information of the adjacent time of feedback specifically includes as current CSI information: when described adjacent time
The CSI information that CSI information is channel busy state time, believe according to the CSI of described adjacent time
RSSI information when ceasing the Channel Detection corresponding with the CSI information of described adjacent time and current
RSSI information during described Channel Detection determines described current CSI information；Or when described adjacent time
The CSI information that CSI information is down channel busy state time, according to the community belonging to described base station
RSRP information and presently described Channel Detection time RSSI information determine that described current CSI believes
Breath.
In this technical scheme, before receiving the up-to-date measurement of terminal the CSI that feeds back, base station can
To obtain current CSI information (alternative CSI information) by following several method, including: adopt
With the CSI information of the adjacent time of the terminal feedback of base station stored (the last CSI information),
Or RRM (Radio resource management, the Radio Resource of the community belonging to employing base station
Management) the RRM measurement result of other communities that measurement result is adjacent with this community and adjacent
The channel busy of other communities or on off state determine current CSI information, such as current CSI information=
The RSRP of current area (community belonging to base station) (Reference signal receiving power,
Reference Signal Received Power)/(community being in open state stronger around the RSRP+ of current area
RSRP)；So, base station can be enable to select more suitably modulation coding mode, or adopt
With minimum modulation coding mode.
Wherein, use the CSI information of adjacent time of the terminal feedback of base station stored as current CSI
Information specifically includes: if recent interval time is shorter, and is down channel idle condition
CSI information；If recent interval time is shorter, and it it is down channel busy state
CSI information, then according to adjacent CSI information (old CSI information) and corresponding channel
(Received signal strength indication, the signal intensity of reception refers to RSSI during detection
Show) information, the RSSI information (new RSSI information) when detecting in conjunction with present channel (is currently believed
Road detection time RSSI information can be terminal when channel idle being detected, the RSSI that will detect
It is quantified as a value, and by this value when the testing result of signals base terminal is idle, informs simultaneously
To base station, at this time, it may be necessary to the corresponding form definition that different RSSI is quantified as different values goes out
Coming, as shown in the table, in table, threshold1 is the parameter of channel busy, if greater than this ginseng
Number, then it represents that channel idle, and threshold 1 < threshold 2 < threshold 3) determine currently
CSI information, such as, the CSI of current CSI information=(RSSI that new RSSI/ is old) × old, or
Person uses RSSI information during RSRP information and the present channel detection of the community belonging to base station to determine
Current CSI information, the RSRP/ of such as current community belonging to CSI information=base station is new
RSSI。
| RSSI scope | The bit that quantized value is corresponding |
| RSSI<threshold 1 | 00 |
| threshold 1<RSSI<threshold 2 | 01 |
| threshold 2<RSSI<threshold 3 | 10 |
| threshold 3<RSSI | 11 |
Fig. 9 shows that LTE system according to an embodiment of the invention is when unauthorized band operation
CSI measures and the structural representation of feedback system.
As it is shown in figure 9, LTE system is when unauthorized band operation according to an embodiment of the invention
CSI measure and feedback system 900, for base station side, including control unit 902, for working as
When having downlink business to arrive, control detection current downlink channel state, and control according to described when front lower
Row channel status sends the CSI corresponding to described current downlink channel state to terminal and measures configuration signal
With CSI feedback configuration signal, or for when there being downlink business to arrive, control to send to terminal corresponding
Configuration signal and CSI feedback configuration signal is measured in the CSI specifying downlink channel condition, so that described
Terminal measures configuration letter according to the CSI that described downlink channel condition is corresponding after knowing downlink channel condition
Order and CSI feedback configuration signal carry out CSI measurement and CSI feedback.
In this technical scheme, when there being downlink business to arrive, and when known downlink channel condition, will
The CSI corresponding with current downlink channel state measures and CSI feedback configuration signal sends to terminal, or
Person, when unknown downlink channel condition, the CSI corresponding with specifying downlink channel condition is measured and
CSI feedback configuration signal send to terminal so that terminal after knowing downlink channel condition according to correspondence
CSI measure and CSI feedback configuration signal carry out CSI measure and CSI detect, so, Ke Yiyou
Effect ground guarantees that LTE system introduces CSI measurement and CSI feedback after LBT mechanism in unauthorized frequency range
Be normally carried out, and then ensure spectrum efficiency and channel utilization rate；Wherein, it is intended that downlink channel condition
Including: down channel busy state or down channel idle condition.
In technique scheme, it is preferable that also include: arrange unit 904, for right in transmission
The CSI of current downlink channel state described in Ying Yu measures configuration signal and CSI feedback configuration signal or right
Should before the CSI specifying downlink channel condition measures configuration signal and CSI feedback configuration signal, if
Put the CSI measurement configuration signal corresponding respectively to down channel busy state and down channel idle condition
With CSI feedback configuration signal.
In technique scheme, it is preferable that described arrange unit 904 specifically for: correspondence is set
Configuration signal and the configuration of CSI feedback configuration signal is measured in the CSI of described down channel busy state
Content specifically includes: when the first described terminal of instruction is used for signal, the CSI measurement that CSI measures
Between and frequency location, the oneth CSI measure the cycle, the first CSI feedback time and the first CSI feedback week
Phase；And setting is anti-corresponding to CSI measurement configuration signal and the CSI of described down channel idle condition
The configuration content of feedback configuration signal specifically includes: second indicates described terminal for the letter of CSI measurement
Number, the 2nd CSI measures time and frequency location, the 2nd CSI is when measuring cycle, the second CSI feedback
Between and the second CSI feedback cycle.
In this technical scheme, by arranging and downlink channel condition (the busy and descending letter of down channel
Road is idle) corresponding CSI measures configuration signal and CSI feedback configuration signal, and and down channel
CSI corresponding to busy state measure the configuration content of configuration signal and CSI feedback configuration signal include but
It is not limited to: first indicates described terminal for the signal (letter measured for CSI of CSI measurement
Number), a CSI measures time and frequency location, a CSI measures cycle, the first CSI feedback
Time and the first CSI feedback cycle, the CSI corresponding with down channel idle condition measures configuration signal
Include but not limited to the configuration content of CSI feedback configuration signal: second indicates described terminal to be used for
Signal (signal measured for CSI), the 2nd CSI that CSI measures measure time and frequency position
Put, the 2nd CSI measures cycle, the second CSI feedback time and the second CSI feedback cycle, by inciting somebody to action
Downlink channel condition measures with CSI and feedback signaling is corresponding, and configures corresponding main contents, with bright
Really indicate when downlink channel condition difference, if need to measure and feedback CSI, and concrete base
Which information to carry out CSI measurement and feedback in, and then effectively ensure that LTE system is at unauthorized frequency
Introduce CSI after LBT mechanism in section to measure and being normally carried out of CSI feedback.
In technique scheme, it is preferable that the described unit 904 that arranges specifically is additionally operable to: arrange institute
State the first described terminal of instruction and include one below or a combination thereof for the signal that CSI measures: by first
Cycle send PSS/SSS signal, by second round send CRS signal, send out by the period 3
The CSI-RS sent and the DRS signal sent by the period 4；Arrange a described CSI to measure
Time and frequency location are the transmission time of the described first signal indicating described terminal to measure for CSI
And frequency location；A described CSI is set and measures the cycle more than or equal to described period 1, described
A cycle maximum in second round, described period 3 and described period 4；Arrange described
One CSI feedback cycle measured the cycle more than or equal to a described CSI；And described second finger is set
Show that described terminal includes one below or a combination thereof for the signal that CSI measures: send by the period 5
PSS/SSS signal, by the period 6 send CRS signal, by the 7th the cycle send CSI-
RS signal and the DRS signal sent by the 8th cycle；Described 2nd CSI is set and measures time and frequency
The described terminal that indicates that rate position is measured configuration signal for described 2nd CSI and provided is measured for CSI
Subframe numbers and sub-carrier positions；Described 2nd CSI is set and measures the cycle more than or equal to described 5th week
A cycle maximum in phase, described period 6, described 7th cycle and described 8th cycle；If
Put the described second CSI feedback cycle to measure the cycle more than or equal to described 2nd CSI, wherein, described
Period 5 is less than or equal to described second week less than or equal to described period 1, described period 6
Phase, described 7th cycle are less than or equal to institute less than or equal to described period 3, described 8th cycle
Stating the period 4, described 2nd CSI measures the cycle and measures the cycle less than a described CSI, and described the
Two CSI feedback cycles were less than or equal to for the first CSI feedback cycle, and it is anti-to arrange a described CSI
Feedback time and described second CSI feedback time include: feed back when the up channel free time being detected, or
Directly feed back after described CSI measurement terminates.
In technique scheme, it is preferable that the described unit 904 that arranges specifically is additionally operable to: it is right to arrange
The CSI of down channel busy state described in Ying Yu and described down channel idle condition measures configuration signal
Specifically include with the configuration content of CSI feedback configuration signal: aperiodicity carry out described CSI measure and
Described CSI feedback.
In this technical scheme, the first instruction terminal corresponding with down channel busy state is for CSI
The signal measured includes but not limited to one below or a combination thereof: send by the period 1 (large period)
PSS send by the period 1 PSS/SSS (Primary Synchronization Signal, main with
Step signal/Secondary Synchronization Signal, auxiliary synchronous signals) signal, by second round
CRS (Common Reference Signal, the public reference signal) letter that (large period) sends
Number, CSI-RS (the Channel State Information-that sends by the period 3 (large period)
Reference Signal, channel state information reference signals) signal and by the period 4 (large period)
DRS (Discovery Reference Signal the finds reference signal) signal sent, Yi Jiyu
Down channel idle condition corresponding second instruction terminal for CSI measure signal include but not limited to
One below or a combination thereof: the PSS/SSS signal that sends by the period 5 (minor cycle), by the 6th
CRS signal that cycle (minor cycle) sends, the CSI-RS sent by the 7th cycle (minor cycle)
Signal and the DRS signal sent by the 8th cycle (minor cycle), wherein, period 1, second
Cycle, period 3 and period 4 are incomplete same, period 5, period 6, the 7th cycle
Incomplete same with the 8th cycle, and period 5, period 6, the 7th cycle and the 8th cycle phase
It is respectively less than or equal to period 1, second round, period 3 and period 4 with answering, the most permissible
Inform that terminal carries out CSI measurement and CSI feedback in several ways；And down channel busy state and
CSI corresponding to down channel idle condition measures and (CSI measures the time time started of feedback
Time and frequency location is measured with frequency location and the 2nd CSI) it is respectively instruction terminal for CSI survey
The subframe numbers measured for CSI be given in the transmission time of the signal of amount and signaling and subcarrier position
Put；CSI feedback cycle corresponding to or descending idle condition busy with down channel measures week more than CSI
Phase, and CSI measures the cycle and is respectively greater than or equal to period 1, second round, period 3 and the
One periodic quantity of the interim maximum of surrounding and period 5, period 6, the 7th cycle and the 8th week
One periodic quantity of interim maximum；And can detect that up channel is idle or channel status is the most true
Fixed situation carries out CSI feedback, i.e. can arbitrarily arrange the CSI feedback time；It is of course also possible to it is non-
Periodically carry out CSI measurement and CSI feedback, when channel status is known or unknown, by right
Clearly which signal should can carry out CSI measurement and feedback based in ground, and clear and definite CSI measures and feedback
Time and the cycle, and then effectively ensure that LTE system introduce in unauthorized frequency range LBT mechanism
Rear CSI measurement is normally carried out with CSI feedback.
In technique scheme, it is preferable that described control unit 902 specifically for: control in institute
State unauthorized frequency range or authorize to send in frequency range corresponding to described down channel busy state and described descending
The CSI of channel clear measures configuration signal and CSI feedback configuration signal and CSI feedback letter
Breath.
In this technical scheme, the CSI corresponding from different downlink channel condition can be measured configuration
Signaling and CSI feedback configuration signal and terminal need the CSI information of feedback to exist after carrying out CSI measurement
It is transmitted, to improve spectrum efficiency and channel utilization rate in unauthorized frequency range or mandate frequency range.
In technique scheme, it is preferable that described control unit 902 is specifically additionally operable to: when in institute
State when repeating Channel Detection with the fixing cycle in unauthorized frequency range, control by RRC signaling
Mode directly to described terminal send corresponding to described down channel busy state or described down channel
The CSI of idle condition measures configuration signal and CSI feedback configuration signal；Maybe described descending when receiving
Business, and in described unauthorized frequency range, carry out down channel detection and described down channel detected
Time idle, control the time started idle according to described down channel and the termination time determines described CSI
Measurement time and frequency location, and by RRC signaling, MAC signaling and/or the side of DCI signaling
Formula to described terminal send corresponding to described down channel idle condition CSI measure configuration signal and
CSI feedback configuration signal.
In this technical scheme, when repeating down channel with the fixing cycle in unauthorized frequency range
During detection (LBT based on FBE (Framed based equipment) mechanism), i.e. channel inspection
The survey time is repeated cyclically appearance, and now CSI measures time and frequency location, such as subframe numbers
It is easier to be indicated to terminal, i.e. by direct RRC (Radio Resource Connection, nothing
Line resource connects) signaling once just can indicate clear, then no matter detects that channel busy can every time
The subframe numbers etc. indicated according to this RRC signaling measures and feeds back；Or, descending when having
Business arrives, and carries out down channel detection in unauthorized frequency range (based on LBE (Load based
Equipment) LBT mechanism), i.e. Channel Detection Time aperiodicity occurs, and in this feelings
There is no Channel Busy times under condition, because if channel busy, just carry out Channel Detection always, then
Only Channel Detection Time and idle time of channel, if channel idle detected, now, base station is only
Can be after channel idle being detected every time, according to initial time and the time of termination of current channel idle
Set a CSI and measure time and frequency location, then by RRC signaling, MAC (Medium
Access control, medium education) signaling or DCI (Downlink control
Indicator, descending control indicates) signaled terminal CSI measures time and frequency location, as
This, it can be ensured that when how CSI being measured time under different LBT mechanism, different channels state
Between and frequency location inform to terminal, and then guarantee that LTE system introduces LBT in unauthorized frequency range
After mechanism, CSI measures and being normally carried out of CSI feedback.
In technique scheme, it is preferable that described control unit 902 is specifically additionally operable to: control
Adjacent sub-frame after Channel Detection Time sends the CSI corresponding to described down channel busy state and measures
Configuration signal and CSI feedback configuration signal；Maybe when the described down channel free time being detected, control to
Described terminal sends channel idle instruction, so that described terminal receives basis after the instruction of described channel idle
The CSI corresponding to described down channel idle condition received measures configuration signal, CSI feedback is joined
Confidence order carries out described CSI measurement and described CSI feedback.
In this technical scheme, when when no matter, down channel busy will measure CSI, base station can be
Subframe adjacent after Channel Detection Time sends the signal for measuring CSI, and terminal can be at letter
Subframe adjacent after the road detection time measure CSI carrying out feed back (this kind of method be applicable to based on
The LBT mechanism of FBE)；Or, when base station is detected and descending letter detected finishing down channel
During the road free time, immediately send channel idle instruction, so that terminal is after receiving channel idle instruction, horse
On carry out CSI measurement, now, base station is after terminal receives channel idle instruction and can carry out
Send, after time needed for CSI measurement, the signal measured for CSI, namely make terminal just receive
After indicating to channel idle, signal when can make to carry out CSI measurement also in transmission, (fit by this kind of method
For LBT based on FBE and LBE mechanism)；So, it is possible to achieve send out in suitable subframe
Send the instruction signal measured for CSI of terminal, with efficiently reduce when base station detect channel idle it
Rear terminal is measured and feeds back CSI time delay interior during this period of time, makes terminal to measure as soon as possible and instead
Feedback CSI, and then improve spectrum efficiency and channel utilization rate.
In technique scheme, it is preferable that described control unit 902 is additionally operable to: receiving
Before stating CSI feedback, control to use the CSI information of the adjacent time of the described terminal feedback of storage to make
For current CSI information, or control to use minimum modulation coding mode, or control to use basis
Other communities that the RRM measurement result of the community belonging to described base station is adjacent with described community
What RRM measurement result and the channel busy of described other adjacent communities or on off state determined works as
Front CSI information；And described control use storage described terminal feedback adjacent time CSI letter
Breath specifically includes as current CSI information: when the CSI information of described adjacent time is channel busy shape
During the CSI information of state, control the CSI information according to described adjacent time and described adjacent time
RSSI when RSSI information during Channel Detection corresponding to CSI information and presently described Channel Detection
Information determines described current CSI information；Or when the CSI information of described adjacent time is that down channel is numerous
During the CSI information of busy condition, according to the RSRP information of the community belonging to described base station with presently described
RSSI information during Channel Detection determines described current CSI information.
In this technical scheme, before receiving the up-to-date measurement of terminal the CSI that feeds back, base station can
To obtain current CSI information (alternative CSI information) by following several method, including: adopt
With the CSI information of the adjacent time of the terminal feedback of base station stored (the last CSI information),
Or RRM (Radio resource management, the Radio Resource of the community belonging to employing base station
Management) the RRM measurement result of other communities that measurement result is adjacent with this community and adjacent
The channel busy of other communities or on off state determine current CSI information, such as current CSI information=
The RSRP of current area (community belonging to base station) (Reference signal receiving power,
Reference Signal Received Power)/(community being in open state stronger around the RSRP+ of current area
RSRP)；So, base station can be enable to select more suitably modulation coding mode, or adopt
With minimum modulation coding mode.
Wherein, use the CSI information of adjacent time of the terminal feedback of base station stored as current CSI
Information specifically includes: if recent interval time is shorter, and is down channel idle condition
CSI information；If recent interval time is shorter, and it it is down channel busy state
CSI information, then according to adjacent CSI information (old CSI information) and corresponding channel
(Received signal strength indication, the signal intensity of reception refers to RSSI during detection
Show) information, the RSSI information (new RSSI information) when detecting in conjunction with present channel (is currently believed
Road detection time RSSI information can be terminal when channel idle being detected, the RSSI that will detect
It is quantified as a value, and by this value when the testing result of signals base terminal is idle, informs simultaneously
To base station, at this time, it may be necessary to the corresponding form definition that different RSSI is quantified as different values goes out
Coming, as shown in the table, in table, threshold1 is the parameter of channel busy, if greater than this ginseng
Number, then it represents that channel idle, and threshold 1 < threshold 2 < threshold 3) determine currently
CSI information, such as, the CSI of current CSI information=(RSSI that new RSSI/ is old) × old, or
Person uses RSSI information during RSRP information and the present channel detection of the community belonging to base station to determine
Current CSI information, the RSRP/ of such as current community belonging to CSI information=base station is new
RSSI。
| RSSI scope | The bit that quantized value is corresponding |
| RSSI<threshold 1 | 00 |
| threshold 1<RSSI<threshold 2 | 01 |
| threshold 2<RSSI<threshold 3 | 10 |
| threshold 3<RSSI | 11 |
Figure 10 shows the structural representation of base station according to an embodiment of the invention.
As shown in Figure 10, base station 1000 according to an embodiment of the invention, including: as above any one
The LTE system described in the technical scheme CSI when unauthorized band operation measures and feedback system
900。
In this technical scheme, base station 1000 by this LTE system when unauthorized band operation
CSI measures and feedback system 900, when there being downlink business to arrive, and at known downlink channel condition
Time, the CSI corresponding with current downlink channel state is measured and CSI feedback configuration signal sent to end
End, or, when unknown downlink channel condition, the CSI corresponding with specifying downlink channel condition is surveyed
Amount and CSI feedback configuration signal send to terminal, so that terminal basis after knowing downlink channel condition
Corresponding CSI measures and CSI feedback configuration signal carries out CSI measurement and CSI detects, so, and can
To effectively ensure that LTE system introduces CSI after LBT mechanism in unauthorized frequency range and measures and CSI
Being normally carried out of feedback, guarantees can to obtain when up-to-date CSI information does not also obtain alternative simultaneously
CSI information so that base station can select more suitably modulation coding mode, improve further frequency
Spectrum efficiency and channel utilization rate.
Technical scheme is described in detail, it can be ensured that LTE system exists above in association with accompanying drawing
Introduce CSI after LBT mechanism in unauthorized frequency range to measure and being normally carried out, the most really of CSI feedback
Protect and can obtain alternative CSI information when up-to-date CSI information does not also obtain, so that base station
More suitably modulation coding mode can be selected, improve spectrum efficiency and channel utilization rate further.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for
For those skilled in the art, the present invention can have various modifications and variations.All essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included in the present invention
Protection domain within.
Claims (19)
1. the LTE system CSI when unauthorized band operation measures and a feedback method, is used for
Base station side, it is characterised in that including:
When there being downlink business to arrive, detect current downlink channel state, and according to described current downlink
Channel status to terminal send corresponding to described current downlink channel state CSI measure configuration signal and
CSI feedback configuration signal；Or
When there being downlink business to arrive, send corresponding to specifying the CSI of downlink channel condition to survey to terminal
Amount configuration signal and CSI feedback configuration signal, so that described terminal root after knowing downlink channel condition
Measure configuration signal according to the CSI that described downlink channel condition is corresponding and CSI feedback configuration signal is carried out
CSI measures and CSI feedback.
The LTE system the most according to claim 1 CSI when unauthorized band operation measures
And feedback method, it is characterised in that survey sending the CSI corresponding to described current downlink channel state
Amount configuration signal and CSI feedback configuration signal or the CSI measurement corresponding to appointment downlink channel condition are joined
Before confidence order and CSI feedback configuration signal, also include:
Setting corresponds respectively to the CSI measurement of down channel busy state and down channel idle condition and joins
Confidence order and CSI feedback configuration signal.
The LTE system the most according to claim 2 CSI when unauthorized band operation measures
And feedback method, it is characterised in that the CSI corresponding to described down channel busy state measures configuration
The configuration content of signaling and CSI feedback configuration signal specifically includes: first indicates described terminal to be used for
Signal, a CSI that CSI measures measure time and frequency location, a CSI measures the cycle, the
One CSI feedback time and the first CSI feedback cycle；And
CSI corresponding to described down channel idle condition measures configuration signal and CSI feedback configuration letter
Order configuration content specifically include: second indicate described terminal for CSI measure signal, second
CSI measures the time and frequency location, the 2nd CSI measure cycle, the second CSI feedback time and second
The CSI feedback cycle.
The LTE system the most according to claim 3 CSI when unauthorized band operation measures
And feedback method, it is characterised in that
Described first signal indicating described terminal to measure for CSI includes one below or a combination thereof:
By the PSS/SSS signal of period 1 transmission, by the CRS signal sent second round, by the 3rd
Cycle send CSI-RS and by the period 4 send DRS signal；
A described CSI measures the time and frequency location is that the described first described terminal of instruction is for CSI
The transmission time of the signal measured and frequency location；
A described CSI measures the cycle more than or equal to described period 1, described second round, institute
State a cycle maximum in period 3 and described period 4；
The described first CSI feedback cycle measures the cycle more than or equal to a described CSI；And
Described second signal indicating described terminal to measure for CSI includes one below or a combination thereof:
By the PSS/SSS signal of period 5 transmission, by the CRS signal of period 6 transmission, by the 7th
The DRS signal that the CSI-RS of cycle transmission and the 8th cycle of pressing send；
Described 2nd CSI measures time and frequency location and measures, for the 2nd CSI, the finger that configuration signal provides
Show subframe numbers and sub-carrier positions that described terminal measures for CSI；
Described 2nd CSI measures the cycle more than or equal to described period 5, described period 6, institute
State a cycle maximum in the 7th cycle and described 8th cycle；
The described second CSI feedback cycle measures cycle, wherein, institute more than or equal to described 2nd CSI
State the period 5 less than or equal to described period 1, described period 6 less than or equal to described second
Cycle, described 7th cycle were less than or equal to less than or equal to described period 3, described 8th cycle
The described period 4, described 2nd CSI measures the cycle and measures week less than or equal to a described CSI
Phase, the described second CSI feedback cycle be less than or equal to the first CSI feedback cycle, and
Described first CSI feedback time and described second CSI feedback time include: up detecting
Feed back during channel idle, or directly feed back after described CSI measurement terminates.
The LTE system the most according to claim 2 CSI when unauthorized band operation measures
And feedback method, it is characterised in that corresponding to described down channel busy state and described down channel
The CSI of idle condition measures the configuration content of configuration signal and CSI feedback configuration signal and specifically includes:
Aperiodicity carries out described CSI and measures and described CSI feedback.
6. according to the LTE system according to any one of claim 2 to 5 at unauthorized band operation
Time CSI measure and feedback method, it is characterised in that in described unauthorized frequency range or authorize in frequency range
Send the CSI measurement corresponding to described down channel busy state, described down channel idle condition to join
Confidence order and CSI feedback configuration signal and CSI feedback information.
7. according to the LTE system according to any one of claim 3 to 4 at unauthorized band operation
Time CSI measure and feedback method, it is characterised in that when in described unauthorized frequency range with fixing
When cycle repeats Channel Detection, it is right directly to send to described terminal by the way of RRC signaling
The CSI of down channel busy state described in Ying Yu or described down channel idle condition measures configuration signal
With CSI feedback configuration signal；Or
When receiving described downlink business, and in described unauthorized frequency range, carry out down channel detection also
When the described down channel free time being detected, the time started idle according to described down channel and termination
Time determines that described 2nd CSI measures time and frequency location, and is believed by RRC signaling, MAC
The mode of order and/or DCI signaling sends corresponding to described down channel idle condition to described terminal
CSI measures configuration signal and CSI feedback configuration signal.
The LTE system the most according to claim 7 CSI when unauthorized band operation measures
And feedback method, it is characterised in that the adjacent sub-frame after Channel Detection Time sends corresponding to described
The CSI of down channel busy state measures configuration signal and CSI feedback configuration signal；Or
When the described down channel free time being detected, send channel idle instruction to described terminal, so that
Described terminal is idle corresponding to described down channel according to receive after receiving the instruction of described channel idle
The CSI of state measures configuration signal and CSI feedback configuration signal carries out described CSI measurement and described
CSI feedback.
The LTE system the most according to claim 8 CSI when unauthorized band operation measures
And feedback method, it is characterised in that before receiving described CSI feedback, use the described of storage
The CSI information of the adjacent time of terminal feedback is as current CSI information, or uses minimum modulation
Coded system, or use the RRM measurement result according to the community belonging to described base station with described
The RRM measurement result of other communities that community is adjacent and the channel of described other adjacent communities are numerous
The current CSI information that busy or on off state determines；And
The CSI information of the adjacent time of the described described terminal feedback using storage is believed as current CSI
Breath specifically includes:
When the CSI information that CSI information is channel busy state of described adjacent time, according to described
During the CSI information of the adjacent time Channel Detection corresponding with the CSI information of described adjacent time
RSSI information when RSSI information and presently described Channel Detection determines described current CSI information；
Or
When the CSI information that CSI information is channel busy state of described adjacent time, according to described
RSSI information when the RSRP information of the community belonging to base station and presently described Channel Detection determines institute
State current CSI information.
10. the LTE system CSI when unauthorized band operation measures and a feedback system, uses
In base station side, it is characterised in that including:
Control unit, for when there being downlink business to arrive, controls detection current downlink channel state,
And control to send corresponding to described current downlink channel shape to terminal according to described current downlink channel state
The CSI of state measures configuration signal and CSI feedback configuration signal；Or
For when there being downlink business to arrive, control to send corresponding to specifying downlink channel condition to terminal
CSI measure configuration signal and CSI feedback configuration signal, so that described terminal is knowing down channel
Configuration signal and CSI feedback configuration letter is measured according to the CSI that described downlink channel condition is corresponding after state
Order carries out CSI measurement and CSI feedback.
The 11. LTE system according to claim 10 CSI when unauthorized band operation surveys
Amount and feedback system, it is characterised in that also include:
Unit is set, for sending the CSI measurement configuration corresponding to described current downlink channel state
Signaling and CSI feedback configuration signal or the CSI corresponding to appointment downlink channel condition measure configuration signal
Before CSI feedback configuration signal, arrange and correspond respectively to down channel busy state and down channel
The CSI of idle condition measures configuration signal and CSI feedback configuration signal.
The 12. LTE system according to claim 11 CSI when unauthorized band operation surveys
Amount and feedback system, it is characterised in that described arrange unit specifically for:
CSI measurement configuration signal corresponding to described down channel busy state is set and CSI feedback is joined
The configuration content of confidence order specifically includes: first indicate described terminal for signal that CSI measures, the
One CSI measures time and frequency location, a CSI measures the cycle, the first CSI feedback time and the
One CSI feedback cycle；And
CSI measurement configuration signal corresponding to described down channel idle condition is set and CSI feedback is joined
The configuration content of confidence order specifically includes: second indicate described terminal for signal that CSI measures, the
Two CSI measure times and frequency location, the 2nd CSI measures the cycle, the second CSI feedback time and the
Two CSI feedback cycles.
The 13. LTE system according to claim 12 CSI when unauthorized band operation surveys
Amount and feedback system, it is characterised in that the described unit that arranges specifically is additionally operable to:
Arranging described first indicates described terminal to include one below or its group for the signal that CSI measures
Close: by the period 1 send PSS/SSS signal, by second round send CRS signal, press
Period 3 send CSI-RS and by the period 4 send DRS signal；
Arrange a described CSI measure time and frequency location be described first indicate described terminal for
The transmission time of the signal that CSI measures and frequency location；
A described CSI is set and measures the cycle more than or equal to described period 1, described second week
A cycle maximum in phase, described period 3 and described period 4；
The described first CSI feedback cycle is set more than or equal to a described CSI measurement cycle；And
Arranging described second indicates described terminal to include one below or its group for the signal that CSI measures
Close: by the period 5 send PSS/SSS signal, by the period 6 send CRS signal, press
The DRS signal that the CSI-RS of the 7th cycle transmission and the 8th cycle of pressing send；
Described 2nd CSI is set and measures time and frequency location for the 2nd CSI measurement configuration signal offer
Indicate described terminal for CSI measure subframe numbers and sub-carrier positions；
Described 2nd CSI is set and measures the cycle more than or equal to described period 5, described 6th week
A cycle maximum in phase, described 7th cycle and described 8th cycle；
Arrange the described second CSI feedback cycle more than or equal to described 2nd CSI measure the cycle, its
In, the described period 5 is less than or equal to institute less than or equal to described period 1, described period 6
State second round, described 7th cycle was less than less than or equal to described period 3, described 8th cycle
Or equal to the described period 4, described 2nd CSI measures the cycle and surveys less than or equal to a described CSI
The amount cycle, the described second CSI feedback cycle be less than or equal to the first CSI feedback cycle, and
The described first CSI feedback time is set and the described second CSI feedback time includes: detecting
Feed back during the up channel free time, or directly feed back after described CSI measurement terminates.
The 14. LTE system according to claim 11 CSI when unauthorized band operation surveys
Amount and feedback system, it is characterised in that the described unit that arranges specifically is additionally operable to:
Arrange the CSI corresponding to described down channel busy state and described down channel idle condition to survey
The configuration content of amount configuration signal and CSI feedback configuration signal specifically includes: aperiodicity carries out described
CSI measures and described CSI feedback.
15. according to the LTE system according to any one of claim 11 to 14 in unauthorized frequency range
CSI during work measures and feedback system, it is characterised in that described control unit specifically for:
Control to send corresponding to the busy shape of described down channel in described unauthorized frequency range or mandate frequency range
The CSI of state and described down channel idle condition measure configuration signal, CSI feedback configuration signal and
CSI feedback information.
16. according to the LTE system according to any one of claim 12 to 13 in unauthorized frequency range
CSI during work measures and feedback system, it is characterised in that described control unit is specifically additionally operable to:
When repeating Channel Detection with the fixing cycle in described unauthorized frequency range, control to pass through
The mode of RRC signaling directly sends corresponding to described down channel busy state or institute to described terminal
The CSI stating down channel idle condition measures configuration signal and CSI feedback configuration signal；Or
When receiving described downlink business, and in described unauthorized frequency range, carry out down channel detection also
When the described down channel free time being detected, control the time started idle according to described down channel and
The termination time determines that described 2nd CSI measures time and frequency location, and by RRC signaling,
The mode of MAC signaling and/or DCI signaling sends corresponding to described down channel idle to described terminal
The CSI of state measures configuration signal and CSI feedback configuration signal.
The 17. LTE system according to claim 16 CSI when unauthorized band operation surveys
Amount and feedback system, it is characterised in that described control unit is specifically additionally operable to:
Control the adjacent sub-frame after Channel Detection Time to send corresponding to described down channel busy state
CSI measure configuration signal and CSI feedback configuration signal；Or
When the described down channel free time being detected, control to send channel idle instruction to described terminal,
So that described terminal receive described channel idle instruction after according to receive corresponding to described down channel
The CSI of idle condition measures configuration signal and CSI feedback configuration signal carries out described CSI measurement and institute
State CSI feedback.
The 18. LTE system according to claim 17 CSI when unauthorized band operation surveys
Amount and feedback system, it is characterised in that described control unit is additionally operable to:
Before receiving described CSI feedback, when controlling described terminal feedback adjacent using storage
Between CSI information as current CSI information, or control to use minimum modulation coding mode, or
It is adjacent with described community according to the RRM measurement result of the community belonging to described base station that person controls employing
The RRM measurement result of other communities and the channel busy of described other adjacent communities or switch
The current CSI information that state determines；And
Described control uses the CSI information of the adjacent time of the described terminal feedback of storage as currently
CSI information specifically includes:
When the CSI information that CSI information is channel busy state of described adjacent time, control basis
During the CSI information of the described adjacent time Channel Detection corresponding with the CSI information of described adjacent time
RSSI information and RSSI information during presently described Channel Detection determine that described current CSI believes
Breath；Or
When the CSI information that CSI information is channel busy state of described adjacent time, according to described
RSSI information when the RSRP information of the community belonging to base station and presently described Channel Detection determines institute
State current CSI information.
19. 1 kinds of base stations, it is characterised in that include as according to any one of claim 10 to 18
The LTE system CSI when unauthorized band operation measure and feedback system.
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| CN201510052163.9A CN104579518B (en) | 2015-01-30 | 2015-01-30 | Base station, and method and system for measuring and feeding CSI (channel state information) |
| PCT/CN2015/077995 WO2016119325A1 (en) | 2015-01-30 | 2015-04-30 | Csi measurement and feedback method, csi measurement and feedback system, and base station |
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| CN201510052163.9A CN104579518B (en) | 2015-01-30 | 2015-01-30 | Base station, and method and system for measuring and feeding CSI (channel state information) |
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| WO2016119325A1 (en) | 2016-08-04 |
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