CN106162727B - User equipment establishes method, small base station and the macro base station of connection - Google Patents
User equipment establishes method, small base station and the macro base station of connection Download PDFInfo
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Abstract
The present invention provides method, small base station and macro base stations that a kind of user equipment establishes connection, method includes the detection reference signal SRS that small base station obtains the up channel of user equipment, the CQI of down channel is generated according to the SRS of up channel, and monitor report is generated according to the CQI of down channel, monitor report is sent to macro base station according to request is monitored, macro base station is set to obtain reference signal detection quality RSRQ according to monitor report, and macro base station is made to judge whether small base station is optimum base station according to RSRQ, if small base station is optimum base station, the connection with user equipment is established.User equipment of the invention establishes method, small base station and the macro base station of connection and replaces down channel SRS using up channel SRS, solves the problems, such as that small base station does not send downlink reference signal and can not choose optimal small base station and establish and connect with user equipment.
Description
Technical field
The present invention relates to method, small base station and macro base stations that the communication technology more particularly to a kind of user equipment establish connection.
Background technique
With the development of wireless communication technique, network service largely increases in mobile communication system, and small base station is due to can be with
The service traffics of effective transfer macro base station, help macro base station to carry out flow unloading, thus are widely used.
Currently, the 3rd generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) is marked
Quasi- tissue RAN2 group is studying small for long term evolution (Long Term Evolution, abbreviation LTE) R12 and R13 version
The relevant item of base station enhancing.The project largely increases for network service in future mobile communication system, small base station super-intensive
Expansion is begged for the problems such as the network deployment of consideration, resource coordination, signaling overheads, uplink and downlink traffic symmetry needed for the scene of arrangement
By to alleviate the huge flow pressure of current network and a large amount of house data business demand.
Traditional LTE network is cell specific reference signal (the Cell-specific reference sent based on base station
Signal, abbreviation CRS) carry out down channel estimation with measurement, specifically, user equipment can pass through measurement base station send
Downlink reference signal, be calculated channel quality and interference level between base station and the UE, so obtain base station and UE it
Between downlink channel condition information (Channel State Information, CSI).Here downlink reference signal mainly wraps
Include cell specific reference signal CRS and channel state information reference signals (Channel-State Information
reference signal,CSI-RS).Further, user equipment is by constantly measuring selection access to above-mentioned reference signal
Optimal service base station.
And in the improvement standard of 3GPP, in order to reduce down-bound pilot frequency signal, the i.e. interference of reference signal, small base station is under
It will no longer include CRS and CSI-RS signal in row reference signal.Accordingly, there exist base stations how to realize that user's down channel is estimated,
And then optimal small base station can not be chosen and establish the problem of connecting with user equipment.
Summary of the invention
The present invention provides a kind of base station down channel estimation methods and base station, for the condition in not downlink reference signal
Estimation of the lower completion to down channel, and then optimal small base station is chosen according to the estimated result of down channel, foundation is set with user
Standby connection.
The first aspect of the invention is to provide a kind of method that user equipment establishes connection, comprising: small base station obtain with
The macro base station of the small base station ownership keeps the detection reference signal SRS of the up channel of the user equipment of connection；The small base
It stands and receives the monitoring request that the macro base station is sent；The small base station generates down channel according to the SRS of the up channel
CQI；The small base station generates monitor report according to the CQI of the down channel；The small base station according to the monitoring request to
The macro base station sends the monitor report, so that the macro base station obtains reference signal detection quality according to the monitor report
RSRQ, and the macro base station is made to judge whether the small base station is optimum base station according to the RSRQ；If the small base station is most
Excellent base station, then the connection with the user equipment is established in the small base station.
The second aspect of the invention also provides a kind of method that user equipment establishes connection, comprising: macro base station is to described
The small base station of macro base station covering sends the detection reference signal that the up channel of user equipment of connection is kept with the macro base station
The monitoring of SRS is requested, so that the small base station refers to according to the channel quality that the SRS of the up channel generates the down channel
Show CQI, and the small base station is made to generate monitor report according to the CQI；The macro base station receives the prison that the small base station is sent
Listen report；The macro base station obtains reference signal detection quality RSRQ according to the monitor report, and is judged according to the RSRQ
Whether the small base station is optimum base station；If the small base station is optimum base station, the macro base station triggers the small base station and builds
The vertical connection with the user equipment.
The third aspect of the invention provides a kind of small base station, comprising: first obtains module, for obtaining and the small base
The macro base station for ownership of standing keeps the detection reference signal SRS of the up channel of the user equipment of connection；First receiving module, is used for
Receive the monitoring request that the macro base station is sent；Generation module, for generating down channel according to the SRS of the up channel
Channel quality indicator (CQI)；And for generating monitor report according to the CQI of down channel；First sending module, for according to institute
It states monitoring request and sends the monitor report to the macro base station, referred to so that the macro base station is obtained according to the monitor report
Signal detection quality RSRQ, and the macro base station is made to judge whether the small base station is optimum base station according to the RSRQ；It establishes
Link block, for building on the connection of the user equipment when the small base station is optimum base station.
The fourth aspect of the invention provides a kind of macro base station, comprising: sending module, for what is covered to the macro base station
Small base station sends the monitoring request of the detection reference signal SRS of the up channel of the current user equipment for keeping connection, so that institute
It states small base station and generates the channel quality indicator (CQI) of the down channel according to the SRS of the up channel, and make the small base station
Monitor report is generated according to the CQI；Second receiving module, the monitor report sent for receiving the small base station；Third obtains
Modulus block for obtaining reference signal detection quality RSRQ according to the monitor report, and judges according to the RSRQ described small
Whether base station is optimum base station；If the small base station is optimum base station, the macro base station triggering small base station is established and institute
State the connection of user equipment；Link block is established in triggering, for triggering the small base station when the small base station is optimum base station
Establish the connection with the user equipment.
From the above technical scheme, user equipment provided by the invention establishes method, small base station and the macro base station of connection,
Under the scene of small base station densification distribution, the reference signal of down channel is replaced using up channel reference signal, thus complete
The estimation of pairs of down channel, and then the optimum base station for selecting access establishes the connection with user equipment, solves existing skill
Small base station does not send downlink reference signal and can not estimate down channel quality in art, can not choose optimal small base station and establish
The problem of being connect with user equipment.
Detailed description of the invention
The user equipment of Fig. 1 one embodiment of the invention establishes the flow chart of connection method；
Fig. 2A -2B is the flow chart that the user equipment that further embodiment of this invention provides establishes connection method；
Fig. 3 is the flow chart for the method that the user equipment that yet another embodiment of the invention provides establishes connection；
Fig. 4 be another embodiment of the present invention provides small base station structural schematic diagram；
Fig. 5 is the structural schematic diagram for the small base station that further embodiment of this invention provides；
Fig. 6 be another embodiment of the present invention provides macro base station structural schematic diagram.
Specific embodiment
Embodiment one
The present embodiment provides a kind of methods that user equipment establishes connection, in narration a specific embodiment of the invention in detail
Before, application scenarios of the invention are simply introduced.Application scenarios of the invention enhance primarily directed to the small base station 3GPP 36.842
In typical scene, that is, have Multiple Small Cell Sites in the coverage area of a macro base station in a network, macro base station and small base station
Number than may be up to 1:40, it is even higher.The wherein transmission power of macro base station about 46dbm, covering radius are small up to 288 meters
Base station refers to micro-base station (micro cell), femto base station (pico cell) or Home eNodeB (femeto cell), hair
It is smaller than macro base station to penetrate power, only general 23dbm, coverage area is only several meters to more than ten meters.
Fig. 1 is that the user equipment (User Equipment, abbreviation UE) of one embodiment of the invention establishes the stream of connection method
Cheng Tu, the executing subject of the present embodiment are small base stations.As shown in Figure 1, this method comprises:
Step 101, small base station obtains the up channel that the user equipment of connection is kept with the macro base station of the small base station ownership
Detection reference signal (Sounding Reference Signal, abbreviation SRS).
The SRS that small base station carries out up channel is monitored, and is obtained and is kept connection with macro base station or initiate with macro base station
The SRS of the user equipment up channel of service request, while the current identification of user equipment, up channel can also be obtained
SRS configuration etc., wherein SRS configuration includes SRS signal bandwidth, frequency location, period, the length of cyclic prefix and sequence information
Deng specifically, small base station is the user equipment obtained by backhaul link (backhual) the Xn interface being connected with macro base station
Information.
Step 102, small base station receives the monitoring request that macro base station is sent.
The case where user equipment is only known due to macro base station, without knowing the connection feelings between small base station and user equipment
Condition, it is therefore desirable to which the SRS of the up channel of user equipment is monitored in small base station, and small base station receives the monitoring that macro base station is sent
Request, meanwhile, monitoring request, which is also used for triggering small base station, reports monitor report.
Step 103, small base station indicates (channel according to the channel quality that the SRS of up channel generates down channel
Quality indication, abbreviation CQI).
Step 104, small base station generates monitor report according to the CQI of down channel.
After the monitoring request that small base station receives that macro base station is sent, then small base station is obtained according to monitoring in step 101
The SRS of up channel generates the CQI of the down channel of user equipment, specifically, under the scene using small base station dense distribution, often
A small base station covering radius only has several meters to more than ten meters of scene feature, and the channel quality of the uplink and downlink of small base station is not much different,
Therefore, the SRS that down channel is replaced using the SRS of up channel, generates the CQI of down channel, and wherein CQI is according to monitoring
To the signal power of SRS be calculated by small base station.Further, small base station generates according to the CQI of down channel and monitors report
It accuses.
It should be noted that wherein the sequence of step 101 and step 102 is not limited, small base station, which can be, to be received
What the SRS for just carrying out up channel to user equipment after the monitoring request sent to macro base station was monitored, and then according to upper
The SRS of row channel generates the CQI of down channel.
Step 105, small base station sends monitor report to macro base station according to monitoring request, so that macro base station is according to monitor report
The reference signal detection quality (Reference Signal Receiving Quality, abbreviation RSRQ) of user equipment is obtained,
And macro base station is made to judge whether small base station is optimum base station according to RSRQ.
Small base station requests to send monitor report to macro base station according to the monitoring that macro base station is sent, and macro base station is according to monitor report
The CQI of the down channel of middle carrying obtains the reference signal detection quality RSRQ of user equipment, should according to obtained RSRQ judgement
Whether small base station is that the optimum base station of service is provided for user equipment.Wherein, it is ranked up by the size for being mainly to RSRQ,
Select base station corresponding to maximum RSRQ, as optimum base station.
It, can also be on the basis of assessing RSRQ when choosing optimum base station, whether comprehensive consideration base station has foot
Enough resources, the suspend mode situation of base station carry out the selection of optimum base station.
Step 106, if small base station is optimum base station, the connection with user equipment is established in small base station.
Wherein, the connection with user equipment is established in small base station is can be and analyzes in macro base station under the control of macro base station
Out after the corresponding optimum base station of user equipment, sends and instruct to small base station, trigger the connection that small base station builds on user equipment.
In addition, macro base station is established with the connection of user equipment and to user if macro base station judges itself for optimum base station
Equipment send downstream cycle SRS, then received by macro base station user equipment transmission down channel CQI, macro base station according to
The channel quality of the down channel of user equipment is estimated in the channel quality instruction of down channel.Macro base station and user equipment
Between how to establish connection and how to the channel quality of the down channel of user equipment carry out estimation belong to the prior art,
Details are not described herein.
From the above technical scheme, in the case that small base station does not send downlink reference signal in the prior art, this hair
The method that the user equipment of bright offer establishes connection replaces the SRS of down channel using the SRS of up channel, generates downlink letter
The CQI in road, and then the optimum base station of user equipment service is selected, establish the connection with user equipment.
Embodiment two
The present embodiment is further to above-described embodiment to be remarked additionally.Fig. 2A -2B is that further embodiment of this invention provides
User equipment establish the flow chart of connection method, as shown in Figure 2 A, in order to further make in step 103 to generating downlink
The estimation of channel is more accurate, this method further include:
Step 107, small base station obtains the SRS of the up channel of the user equipment currently connected, and according to up channel
The channel quality indicator (CQI) of SRS acquisition up channel.
Specifically, small base station is available currently to be connected after user equipment and small base station, that is, optimum base station establish connection
The SRS of the up channel of the user equipment connect.The SRS of up channel at this time is according to the first of macro base station the prison request
, alternatively, if in a step 101, small base station had obtained the SRS of the up channel of the user equipment currently connected, then small
Base station selects the SRS of the up channel of the user equipment currently connected according to the user identifier of current user equipment, is not necessarily to
It reacquires, so as to reduce the number of signalling.Further, it is obtained according to the signal power of the SRS of up channel
The channel quality indicator (CQI) of up channel.
Step 108, small base station selects the first modulation coding scheme of corresponding down channel according to the CQI of up channel
(Modulation and Coding Scheme, abbreviation MCS).
Specifically, small base station is using the CQI of up channel as the CQI of down channel, so can according to CQI and MCS it
Between mapping relations choose the first modulation coding scheme MCS.How to be mapped between specific CQI and MCS and belong to the prior art, herein
It repeats no more.
Step 109, the user equipment after small base station triggers connection uses the first MCS, and obtains the bit error rate of down channel.
User equipment can trigger user equipment using in step 108 while receiving the downlink data that small base station is sent
The first MCS chosen, and then downlink data is demodulated according to the first MCS, the bit error rate of down channel can be calculated, it is specific to calculate
The method of the bit error rate is sampled the mode of judgement, this is same as the prior art, and details are not described herein.Further, small base station
Obtain the bit error rate for the down channel that user equipment is sent.
Step 110, judge whether the bit error rate persistently increases, if the determination result is YES, then the small base station is to the user
Equipment sends user-specific down channel measuring signal, so that the user equipment sends the CQI of down channel.
Small base station judges whether the bit error rate persistently increases, and if the determination result is YES, then explanation is at this point for down channel
Estimated result is simultaneously bad, and the bit error rate is raised the reason is that, the order of the first MCS selected in step 108 is excessively high, so as to cause
The promotion of the bit error rate, according to the mapping relations of CQI and MCS it is found that the basic reason for causing the bit error rate to be promoted is that uplink is believed
The CQI for the down channel that the CQI in road namely estimates is better than the CQI of actual down channel, so as to cause the modulation of MCS selection
Coding order is got higher, therefore is corrected to the estimated result of above-mentioned down channel, and small base station is special to user equipment transmission user
Subordinate's row channel measurement signal sends the CQI of down channel so that user equipment be made to send the SRS of down channel, obtain true
The CQI of real down channel.Wherein, specifically when judging whether the bit error rate persistently increases, a preset time can be set, calculate
The variation tendency of the bit error rate in the preset time, or calculate the bit error rate variation tendency of preset times.
Alternatively, since macro base station has more powerful computing resource and storage resource, small base station is obtaining downlink
After the bit error rate of channel, which can be sent to macro base station, judge whether the bit error rate persistently increases by macro base station, by macro
The small base station of base station triggers sends user-specific down channel measuring signal to user equipment.Or between macro base station and small base station
Backhaul link capacity and time delay when not being bottleneck, such as backhaul link between macro base station and micro-base station is ideal
When optical fiber connects, just it is more suitable for being transferred to macro base station completion judgement or calculates, mitigate the pressure and expense of small base station.
Step 111, small base station selects corresponding 2nd MSC according to the CQI of down channel, and sends second to user equipment
MSC, so that user equipment is decoded according to the 2nd MSC.
Small base station selects corresponding 2nd MSC according to the CQI of down channel, i.e., according to the CQI of true down channel, and
It is not the CQI estimated by the CQI of up channel, to reselect corresponding 2nd MSC.
As shown in Figure 2 B, user equipment provided in this embodiment is established in the method for connection, further includes step 1101, if sentencing
The disconnected bit error rate whether continue raised result be it is no, then small base station judges whether cycle rate counter has reached predetermined period, if
Cycle rate counter has reached predetermined period, then small base station sends user-specific down channel measuring signal to user equipment, with
User equipment is set to send the CQI of down channel, wherein cycle rate counter is user equipment after the connection of small base station triggers using the
Start timing while one MSC.
When replacing down channel CQI using the CQI of up channel to estimate down channel, when up channel
When CQI is poorer than the CQI of actual downstream channel, the order that will lead to MCS selection modulation coding scheme is lower, and sets so as to cause user
It is standby not reach most efficient handling capacity, therefore, judge the bit error rate whether persistently raised result for it is no when, pass through periodicity
The small base station of triggering send the estimation that user-specific down channel measuring signal carries out down channel.The bit error rate does not increase tool persistently
The form of expression there are many having, for example, the bit error rate persistently reduces, the bit error rate fluctuates, the bit error rate is unchanged etc..Wherein, cycle count
Device be user equipment receive downlink data it is post-opening, that is, user equipment use a MSC while start timing.
Step 1102, small base station selects corresponding 3rd MSC according to the CQI of down channel, and sends the to user equipment
Three MSC, so that user equipment is decoded according to the 3rd MSC.
Wherein, equally it is alternatively possible to which triggering small base station from macro base station sends user-specific downlink to user equipment
Channel measurement signal.
Also, after step 109 further include: judge the bit error rate whether more than the first preset value, if the bit error rate is more than
First preset value then directly triggers small base station to user equipment and sends user-specific down channel measuring signal.That is, working as
When the bit error rate is always held at very high level, this channel of CQI of down channel is replaced to estimate using the CQI of up channel at this time
Meter mode has been not suitable for, it is therefore desirable to directly transmit user-specific down channel measuring signal to complete estimating for down channel
Meter or measurement.
Specifically first judge whether the bit error rate more than the first preset value still first judges whether the bit error rate persistently increases, Ke Yigen
It is set according to actual needs.For example, after step 109, and prior to step 110, first judge the bit error rate whether more than
One preset value when judging result is no, executes step 110.
On the basis of the above embodiments, wherein the monitor report of step 104 and step 105 can also include small base station
Load information, antenna configuration, send downlink data send power, configure resource block number N and user equipment position
Confidence breath, wherein N is positive integer.Specifically, macro base station can be according to the antenna configuration of small base station and the hair of transmission downlink data
Sending power to obtain includes orthogonal frequency division multiplexing (the Orthogonal Frequency of reference signal on antenna port port0
Division Multiplexing, abbreviation OFDM) power on symbol linear averaging, i.e. the received signal of user equipment
Intensity (Received Signal Strength Indication, abbreviation RSSI), and can be counted according to the SRS of up channel
Calculate Reference Signal Received Power (Reference Signal Receiving Power, the letter for obtaining user's equipment downward channel
Claim RSRP), to obtain RSRQ according to RSRQ=N × RSRP/RSSI.The power which small base station RSRQ can reflect out is to have
Power with power, which small base station is jamming power, therefore can choose optimum base station according to RSRQ.Specifically, selecting
When taking optimum base station, can according to the location information of the load information of small base station and user equipment, base station suspend mode situation and
The common comprehensive descision such as RSRQ selects optimum base station.
From the above technical scheme, the method that user equipment provided by the invention establishes connection, by down channel
Estimated result modified, down channel is accurately estimated to realize, also, is needed with base station small in the prior art to institute
The transmission downlink reference signal of some user equipment broadcast types is compared, and the small base station in the present embodiment is sending user-specific downlink
When reference signal, it is known which user equipment accessed, therefore reduces down-bound pilot frequency signal, is i.e. the hair of downlink reference signal
Number is sent, the interference of descending pilot frequency is reduced.
Embodiment three
The present embodiment provides a kind of method that user equipment establishes connection, Fig. 3 is the use that yet another embodiment of the invention provides
Family equipment establishes the flow chart of the method for connection, as shown in figure 3, this method comprises:
Step 201, the small base station that macro base station is covered to macro base station, which is sent, keeps the upper of the user equipment connected with macro base station
The monitoring of the detection reference signal SRS of row channel is requested, so that small base station generates down channel according to the SRS of up channel
CQI, and small base station is made to generate monitor report according to CQI.
Wherein, the SRS of up channel is obtained under the control of macro base station, in the SRS for obtaining up channel
While, the SRS configuration etc. of the current identification, up channel of user equipment can also be obtained, wherein SRS configuration includes that SRS believes
Number bandwidth, frequency location, period, the length of cyclic prefix and sequence information etc..Macro base station is sending monitoring request to small base station
Later, the CQI for triggering the down channel of the SRS generation user equipment for the up channel that small base station is monitored, specifically, utilizing
Under the scene of small base station dense distribution, each small base station covering radius only has several meters to more than ten meters of scene feature, small base station
The channel quality of uplink and downlink is not much different, and therefore, the SRS that can use up channel replaces the SRS of down channel, generates downlink
The CQI of channel, wherein CQI is to be calculated according to the signal power for monitoring obtained SRS by small base station.It is of course also possible to be
The signal power of SRS is sent to macro base station by small base station, is calculated by macro base station.
Step 202, macro base station receives the monitor report that small base station is sent.
Step 203, macro base station according to monitor report obtain user equipment reference signal detection quality RSRQ, and according to
RSRQ judges whether small base station is optimum base station.
Macro base station obtains reference signal detection quality RSRQ according to the CQI of the down channel carried in monitor report, according to
Obtained RSRQ judge the small base station whether be user equipment optimum base station.Wherein, RSRQ mainly according to signal quality come
Different small base stations is ranked up, i.e., is optimum base station according to which base station RSRQ analyzes.
Wherein, monitor report further include the load information of small base station, antenna configuration, the transmission power for sending downlink data,
The number N of resource block and the location information of user equipment are configured, macro base station obtains reference signal according to monitor report and receives matter
Measure RSRQ.Specifically, macro base station can obtain antenna according to the antenna configuration of small base station and the transmission power of transmission downlink data
The linear averaging of the power in OFDM symbol on the port0 of port comprising reference signal, i.e. the received signal intensity of macro base station
(Received Signal Strength Indication, abbreviation RSSI), and can be calculated and be obtained according to the SRS of up channel
The Reference Signal Received Power RSRP of down channel is taken, to obtain RSRQ according to RSRQ=N × RSRP/RSSI.RSRQ can be with
The power for reflecting which small base station is available power, and the power of which small base station is jamming power, therefore can be according to RSRQ
To choose optimum base station.It, can be according to the load information of small base station and user equipment specifically, when choosing optimum base station
Location information and the common comprehensive descision of RSRQ three select optimum base station.
Step 204, if small base station is optimum base station, macro base station triggers the connection of small base station foundation and user equipment.
Wherein, in step 204, if macro base station judges itself for optimum base station, macro base station is established and user equipment
It connects and sends downstream cycle SRS to user equipment, then receive the down channel of user equipment transmission by macro base station
CQI, macro base station estimate the channel quality of the down channel of user equipment according to the instruction of the channel quality of down channel.
From the above technical scheme, in the case that small base station does not send downlink reference signal in the prior art, this hair
The method that the user equipment of bright offer establishes connection replaces the SRS of down channel using the SRS of up channel, generates downlink letter
The CQI in road, and then the optimum base station of user equipment service is selected, establish the connection with user equipment.
Example IV
The present embodiment provides a kind of small base station, Fig. 4 be another embodiment of the present invention provides small base station structural schematic diagram,
As shown in figure 4, the small base station includes the first acquisition module 10, the first receiving module 11, generation module 12, the first sending module 13
With establish link block 14.
Wherein, the first acquisition module 10, which is used to obtain, keeps the user equipment connected with the macro base station of small base station ownership
The detection reference signal SRS of row channel.Specifically, the SRS that small base station carries out up channel is monitored, the first acquisition module 10 is used for
It obtains and keeps connection or the SRS with the user equipment up channel of macro base station initiating business request with macro base station, simultaneously
The SRS configuration etc. of the current identification, up channel of user equipment is also obtained, wherein SRS configuration includes SRS signal bandwidth, frequency
Position, period, the length of cyclic prefix and sequence information etc..
First receiving module 11, for receiving the monitoring request of macro base station transmission.
Generation module 12, the SRS for obtaining the up channel that module 10 obtains according to first generate the letter of down channel
Road quality indicator (CQI), and for generating monitor report according to the CQI of down channel.
After the monitoring request that small base station receives that macro base station is sent, then the generation module 12 of small base station is obtained according to first
The SRS for the up channel that module 10 acquires generates the CQI of the down channel of user equipment, specifically, due in small base station
Under the scene of dense distribution, each small base station covering radius only has several meters to more than ten meters of scene feature, the uplink and downlink of small base station
Channel quality be not much different, therefore, generation module 12 using up channel SRS replace down channel SRS, generate downlink
The CQI of channel, wherein CQI is to be calculated according to the signal power for monitoring obtained SRS by small base station.Further, small base
The generation module 12 stood generates monitor report according to the CQI of down channel.
First sending module 13 generates mould for sending according to the received monitoring request of the first receiving module 11 to macro base station
The monitor report that block 12 generates so that macro base station obtains reference signal detection quality RSRQ according to monitor report, and makes macro base station
Judge whether small base station is optimum base station according to RSRQ, if judge with regard to result be it is yes, triggering establish link block 14.
Link block 14 is established, for building on the connection of user equipment.
From the above technical scheme, in the case that small base station does not send downlink reference signal in the prior art, this hair
The small base station of bright offer is replaced the SRS of down channel using the SRS of up channel, generates the CQI of down channel, and then select
The optimum base station of user equipment service establishes the connection with user equipment.
The concrete operation method and embodiment one of the small base station of the present embodiment are consistent, and details are not described herein.
Embodiment five
The present embodiment continue it is further to above-described embodiment remarked additionally, Fig. 5 provides for further embodiment of this invention
Small base station structural schematic diagram, as shown in figure 5, the small base station further include the second acquisition module 15, first choice module 16, touching
Send out module 17, judgment module 18, the second selecting module 19 and third selecting module 20.
Second obtains module 15, obtains the user currently connecting for being established after the connection with user equipment in small base station
The SRS of the up channel of equipment, and according to the channel quality indicator (CQI) of the SRS of up channel acquisition up channel.
Specifically, the second of small base station obtains module after user equipment and small base station, that is, optimum base station establish connection
The SRS of the up channel of the 15 available user equipmenies currently connected.Specifically, the SRS of up channel at this time is basis
The monitoring request of macro base station, alternatively, if in a step 101, small base station has passed through the first acquisition module 10 and obtained
The SRS of the up channel of the user equipment currently connected, then small base station is selected currently according to the user identifier of current user equipment
The SRS of the up channel of the user equipment of connection, without reacquiring, so as to reduce the number of signalling.Into
One step, second obtains module 15 indicates according to the channel quality that the signal power of the SRS of up channel obtains up channel
CQI。
First choice module 16, under the CQI selection of the up channel for being obtained according to the second acquisition module 15 is corresponding
First MCS of row channel.Wherein, small base station is using the CQI of up channel as the CQI of down channel, and then first choice module
16 can choose the first modulation coding scheme MCS according to the mapping relations between CQI and MCS.
Trigger module 17, for triggering the user equipment after connecting using the bit error rate of the first MSC acquisition down channel.With
Family equipment can trigger user equipment while receiving the downlink data that small base station is sent and be chosen using first choice module 16
The first MCS, and then according to the first MCS demodulate downlink data, the bit error rate of down channel can be calculated, specifically calculate error code
The method of rate is sampled the mode of judgement, this is same as the prior art, and details are not described herein.Further, small base station utilizes
Second obtains the bit error rate that module 15 obtains down channel.
Judgment module 18 if the determination result is YES, is then sent for judging whether the bit error rate persistently increases to user equipment
User-specific down channel measuring signal, so that user equipment sends the CQI of down channel.
After the bit error rate that small base station receives down channel, judge whether the bit error rate persistently increases using judgment module 18.
If judge the bit error rate whether continue raised result be it is yes, illustrate at this point for the estimated result of down channel and bad, mistake
Code rate is raised the reason is that, the first MCS that selects of first choice module 16 is excessively high, so as to cause the promotion of the bit error rate,
That is according to the mapping relations of CQI and MCS it is found that the basic reason for causing the bit error rate to be promoted is the CQI of up channel,
The CQI for the down channel namely estimated is better than the CQI of actual down channel, so as to cause the modulating-coding rank of MCS selection
Caused by number is got higher, therefore small base station sends user-specific down channel measuring signal to user equipment, to make user equipment
The SRS of down channel is sent, that is, sends the CQI of down channel, that is, obtains the CQI of true down channel.Wherein, specifically sentencing
When whether the disconnected bit error rate persistently increases, a preset time can be set, calculate the variation tendency of the bit error rate in the preset time,
Or calculate the bit error rate variation tendency of preset times.
Judgment module 18 be also used to judge the bit error rate whether continue raised result for it is no when, judge that cycle rate counter is
It is no to have reached predetermined period, if cycle rate counter has reached predetermined period, user-specific downlink is sent to user equipment
Channel measurement signal, so that user equipment sends the CQI of down channel, wherein cycle rate counter is after small base station triggers connect
User equipment using the first MSC obtain down channel the bit error rate while start timing.
Second selecting module 19 is yes for judging whether the bit error rate continues raised judging result in judgment module 18
When, corresponding 2nd MSC is selected according to the CQI of down channel, and send the 2nd MSC to user equipment, so that user equipment root
It is decoded according to the 2nd MSC.
Third selecting module 20 is no for judging whether the bit error rate continues raised judging result in judgment module 18
When, corresponding 3rd MSC is selected according to the CQI of down channel, and send the 3rd MSC to user equipment, so that user equipment root
It is decoded according to the 3rd MSC.
From the above technical scheme, small base station provided by the invention, is repaired by the estimated result to down channel
It is whole, down channel is accurately estimated to realize, also, need to broadcast to all user equipmenies with base station small in the prior art
The transmission downlink reference signal of formula is compared, and the small base station in the present embodiment is when sending user-specific downlink reference signal,
Know which user equipment accessed, therefore reduce down-bound pilot frequency signal, is i.e. the transmission times of downlink reference signal, under reducing
The interference of row pilot tone.
Embodiment six
The present embodiment provides a kind of macro base station, Fig. 6 be another embodiment of the present invention provides macro base station structural schematic diagram,
As shown in fig. 6, the macro base station includes sending module 40, the second receiving module 41, third obtains module 42, connection mould is established in triggering
Block 43.
Sending module 40, the small base station for covering to macro base station send the uplink letter of the current user equipment for keeping connection
The monitoring of the detection reference signal SRS in road is requested, so that small base station generates the channel matter of down channel according to the SRS of up channel
Amount instruction CQI, and small base station is made to generate monitor report according to CQI.
Second receiving module 41, the monitor report sent for receiving small base station.
Third obtains module 42, detects matter for obtaining reference signal according to the received monitor report of the second receiving module 41
RSRQ is measured, and judges whether small base station is optimum base station according to RSRQ, if small base station is optimum base station, macro base station triggers small base
It stands and establishes and the connection of user equipment.Monitor report can also include the load information of small base station, antenna configuration, send lower line number
According to send power, configure resource block number N and user equipment location information.Specifically, macro base station can be according to small
The antenna configuration of base station and the OFDM that power obtains on antenna port port0 comprising reference signal that sends for sending downlink data are accorded with
The linear averaging of power on number, i.e. received signal intensity (the Received Signal Strength of user equipment
Indication, abbreviation RSSI), and the reference signal reception function for obtaining down channel can be calculated according to the SRS of up channel
Rate (Reference Signal Receiving Power, abbreviation RSRP), to be obtained according to RSRQ=N × RSRP/RSSI
RSRQ.The power which small base station RSRQ can reflect out is available power, and the power of which small base station is jamming power, therefore
Optimum base station can be chosen according to RSRQ.Specifically, when choosing optimum base station, can according to the load information of small base station with
And the location information and the common comprehensive descision of RSRQ three of user equipment select optimum base station.
Link block 43 is established in triggering, judges small base station for optimum base station according to RSRQ for obtaining module 42 in third
When, trigger the connection of small base station foundation and user equipment.
From the above technical scheme, in the case that small base station does not send downlink reference signal in the prior art, this hair
The macro base station of bright offer is replaced the SRS of down channel using the SRS of up channel, generates the CQI of down channel, and then select
The optimum base station of user equipment service establishes the connection with user equipment.
It should be noted that the function of small base station and macro base station in the embodiment of the present invention one, two, three can be by embodiment
Four and the small base station in embodiment five and macro base station realize and in above-described embodiment, all respectively have to the description of each embodiment
Stress, the part being not described in some embodiment may refer to the associated description in other embodiments.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (8)
1. the method that user equipment establishes connection characterized by comprising
Small base station is obtained keeps the detection of the up channel of user equipment of connection to refer to the macro base station of the small base station ownership
Signal SRS；
The small base station receives the monitoring request that the macro base station is sent；
The small base station generates the channel quality indicator (CQI) of down channel according to the SRS of the up channel；
The small base station generates monitor report according to the CQI of the down channel；
The small base station requests to send the monitor report to the macro base station according to the monitoring so that the macro base station according to
The monitor report obtains reference signal detection quality RSRQ, and the macro base station is made to judge the small base station according to the RSRQ
It whether is optimum base station；
If the small base station is optimum base station, the connection with the user equipment is established in the small base station；
Wherein, the small base station is established after the connection with the user equipment, further includes:
The small base station obtains the SRS of the up channel of the user equipment currently connected, and is obtained according to the SRS of the up channel
Take the CQI of up channel；
The small base station selects the first modulation coding scheme MCS of corresponding down channel according to the CQI of the up channel；
User equipment after connecting described in the small base station triggers uses the first MSC, and obtains the mistake of the down channel
Code rate；
Judge whether the bit error rate persistently increases, if the determination result is YES, then the small base station is sent to the user equipment
User-specific down channel measuring signal, so that the user equipment sends the CQI of true down channel；
The small base station selects corresponding 2nd MSC according to the CQI of the true down channel, and sends out to the user equipment
The 2nd MSC is sent, so that the user equipment is decoded according to the 2nd MSC.
2. the method that user equipment according to claim 1 establishes connection, which is characterized in that described in the small base station obtains
After the bit error rate that user equipment is sent, further includes:
If judge the bit error rate whether continue raised result be it is no, whether the small base station judge cycle rate counter
Reach predetermined period, if the cycle rate counter has reached predetermined period, the small base station is sent to the user equipment
The user-specific down channel measuring signal, so that the user equipment sends the CQI of true down channel, wherein institute
Stating cycle rate counter is that the user equipment after connecting described in the small base station triggers starts timing while using a MSC
's；
The small base station selects corresponding 3rd MSC according to the CQI of the true down channel, and sends out to the user equipment
The 3rd MSC is sent, so that the user equipment is decoded according to the 3rd MSC.
3. the method that user equipment described in any one of -2 establishes connection according to claim 1, which is characterized in that the monitoring
Report includes the load information, antenna configuration, the number for sending power, configuring resource block for sending downlink data of the small base station
And the location information of the user equipment.
4. a kind of method that user equipment establishes connection characterized by comprising
The small base station that macro base station is covered to the macro base station sends the uplink letter that the user equipment of connection is kept with the macro base station
The monitoring of the detection reference signal SRS in road is requested, so that the small base station generates down channel according to the SRS of the up channel
Channel quality indicator (CQI), and make the small base station according to the CQI generate monitor report；
The macro base station receives the monitor report that the small base station is sent；
The macro base station obtains reference signal detection quality RSRQ according to the monitor report, and according to RSRQ judgement
Whether small base station is optimum base station；
If the small base station is optimum base station, the macro base station triggers the company of small the base station foundation and the user equipment
It connects, so that the small base station obtains the SRS of the up channel of the user equipment currently connected, and according to the up channel
The CQI of SRS acquisition up channel；The small base station selects the first of corresponding down channel according to the CQI of the up channel
Modulation coding scheme MCS；User equipment after connecting described in the small base station triggers uses the first MSC, and described in acquisition
The bit error rate of down channel；Judge whether the bit error rate persistently increases, if the determination result is YES, then the small base station is to described
User equipment sends user-specific down channel measuring signal, so that the user equipment sends the CQI of true down channel；
The small base station selects corresponding 2nd MSC according to the CQI of the true down channel, and sends institute to the user equipment
The 2nd MSC is stated, so that the user equipment is decoded according to the 2nd MSC.
5. the method that user equipment according to claim 4 establishes connection, which is characterized in that
The monitor report further includes the load information of the small base station, antenna configuration, the transmission power for sending downlink data, matches
The number of resource block and the location information of the user equipment are set, the macro base station obtains user according to the monitor report and sets
Standby Reference Signal Received Quality RSRQ.
6. a kind of small base station characterized by comprising
First obtains module, for obtaining the up channel for keeping the user equipment of connection with the macro base station of the small base station ownership
Detection reference signal SRS；
First receiving module, the monitoring request sent for receiving the macro base station；
Generation module, for generating the channel quality indicator (CQI) of down channel according to the SRS of the up channel；And it is used for
Monitor report is generated according to the CQI of down channel；
First sending module, for sending the monitor report to the macro base station according to monitoring request, so that described macro
Base station obtains reference signal detection quality RSRQ according to the monitor report, and the macro base station is made to judge institute according to the RSRQ
State whether small base station is optimum base station, if the determination result is YES, then link block is established in triggering；
It is described to establish link block, for building on the connection of the user equipment；
Wherein, the small base station further include:
Second obtains module, obtains the use currently connecting with after the connection of the user equipment for establishing in the small base station
The SRS of the up channel of family equipment, and according to the channel quality indicator (CQI) of the SRS of up channel acquisition up channel；
First choice module, for selecting the first modulating-coding side of corresponding down channel according to the CQI of the up channel
Formula MCS；
Trigger module obtains the mistake of the down channel for triggering the user equipment after the connection using the first MSC
Code rate；
Judgment module if the determination result is YES, is then sent out for judging whether the bit error rate persistently increases to the user equipment
User-specific down channel measuring signal is sent, so that the user equipment sends the CQI of true down channel；
Second selecting module, for selecting corresponding 2nd MSC according to the CQI of the true down channel and to the user
Equipment sends the 2nd MSC, so that the user equipment is decoded according to the 2nd MSC.
7. small base station according to claim 6, which is characterized in that
The judgment module be also used to judge the bit error rate whether continue raised result for it is no when, judge cycle rate counter
Whether predetermined period is had reached, if the cycle rate counter has reached predetermined period, sends institute to the user equipment
User-specific down channel measuring signal is stated, so that the user equipment sends the CQI of true down channel, wherein described
Cycle rate counter is that the user equipment after connecting described in the small base station triggers obtains the down channel using the first MSC
The bit error rate while start timing；
Further include:
Third selecting module, for selecting corresponding 3rd MSC according to the CQI of the true down channel, and to the use
Family equipment sends the 3rd MSC, so that the user equipment is decoded according to the 3rd MSC.
8. a kind of macro base station characterized by comprising
Sending module, the small base station for covering to the macro base station send the up channel of the current user equipment for keeping connection
Detection reference signal SRS monitoring request so that the small base station generates down channel according to the SRS of the up channel
Channel quality indicator (CQI), and the small base station is made to generate monitor report according to the CQI；
Second receiving module, the monitor report sent for receiving the small base station；
Third obtains module, for obtaining the reference signal detection quality RSRQ of user equipment, and root according to the monitor report
Judge whether the small base station is optimum base station according to the RSRQ；If the small base station is optimum base station, the macro base station touching
To send out described small, and the connection with the user equipment is established in base station, so that the small base station obtains the upper of the user equipment currently connected
The SRS of row channel, and according to the CQI of the SRS of up channel acquisition up channel；Believed according to the uplink the small base station
The CQI in road selects the first modulation coding scheme MCS of corresponding down channel；User after being connected described in the small base station triggers
Equipment uses the first MSC, and obtains the bit error rate of the down channel；Judge whether the bit error rate persistently increases, if
Judging result be it is yes, then the small base station to the user equipment send user-specific down channel measuring signal so that described
User equipment sends the CQI of true down channel；The small base station selects corresponding according to the CQI of the true down channel
The 2nd MSC, and the 2nd MSC is sent to the user equipment, so that the user equipment is carried out according to the 2nd MSC
Decoding；
Link block is established in triggering, is established and the user for triggering the small base station when the small base station is optimum base station
The connection of equipment.
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