CN103812626B - The method of CSI processes and corresponding base station are selected for cooperative multi-point user - Google Patents
The method of CSI processes and corresponding base station are selected for cooperative multi-point user Download PDFInfo
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- 238000005259 measurement Methods 0.000 claims description 64
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Abstract
The present invention provides a kind of method for cooperative multi-point user selection channel state information process and the base stations of the execution above method.This method includes：Obtain the traffic load of the wireless communication system；The traffic load is compared to determine to the loading level of the wireless communication system with pre-set one or more load-thresholds, determines that different base stations configures CSI processes by different loading levels.Method provided by the invention and base station can adapt to various wireless communications environments, no matter can provide preferable system performance in the high or low network environment of traffic load, and the complexity of network scheduling can also effectively be reduced when traffic load is low.
Description
Technical field
The present invention relates to wireless communication field, espespecially a kind of is cooperative multi-point（CoMP, Coordinatedmulti-
point）User selects channel state information（CSI, channel state information）Process（process）Method,
And perform the base station of the above method.
Background technology
Channel state information process（CSI process）By to signal measurement resource（SMR, signalmeasurement
resource）And interferometry resource（interference measurement resource）It measures and processing obtains.
CSI processes include order designator（RI, rank indicator）, precoding matrix indicators（PMI, precoding matrix
indicator）And channel quality indicator（CQI, channelquality indicator）Etc. parameters.CSI processes and 3GPP
CSI in the specifications such as Rel-8,3GPP Rel-10 is similar.
In order to support cooperative multi-point（CoMP）The kinds of schemes of transmission, such as cooperative scheduling/dynamic point are closed（CS/DPB,
coordinated scheduling/dynamic point blanking）, dynamic point selection/dynamic point closing（DPS/DPB,
dynamic point selection/dynamic point blanking）And joint transmission（JT, joint
transmission）Etc. CoMP schemes, base station need to receive and carrys out user terminal（UE）A variety of CSI processes feedback to carry out
Combined dispatching；Alternatively, base station obtains new CSI processes and carries out combined dispatching by being updated to the CSI processes received.
Include two sending points for CoMP measurement sets（TP, transmission point）The feelings of respectively TP1 and TP2
Condition is transmitted according to DPS schemes（Referred to as 2-TP DPS/DPB）, at this time base station need receive or can update to obtain 4
Kind CSI processes.The CSI processes of this 4 type（That is the corresponding CSI processes of 2-TPCoMP）As shown in table 1, including：CSI1、
CSI2、CSI3、CSI4.Wherein, the signal section of CSI1 comes from TP1, sending point of the interference sections outside TP1（Including TP2
With other sending points）；The signal section of CSI2 comes from TP1, sending point of the interference sections outside TP1 and TP2（It is namely wireless
Other sending points in communication system in addition to TP1 and TP2）；The signal section of CSI3 come from TP2, interference sections from TP2 it
Outer sending point（Including TP1 and other sending points）；The signal section of CSI4 come from TP2, interference sections from TP1 and TP2 it
Outer sending point.Wherein, the corresponding CSI processes of TP1 are { CSI1, CSI2 }, and the corresponding CSI processes of TP2 are { CSI3, CSI4 }.
Table 1
In the case of CoMP measurement sets are respectively TP1, TP2, TP3 including three sending points, carried out according to DPS schemes
Transmission（Referred to as 3-TP DPS/DPB）, at this time base station need to receive or 12 kinds of CSI processes obtained to be combined by update
Scheduling, the CSI processes of this 12 type（That is the corresponding CSI processes of 3-TPCoMP）As shown in table 2, meaning is similar with table 1, this
Place repeats no more.Wherein, the corresponding CSI processes of TP1 are { CSI1, CSI2, CSI6, CSI10 }, and the corresponding CSI processes of TP2 are
{ CSI3, CSI4, CSI8, CSI11 }, the corresponding CSI processes of TP3 are { CSI5, CSI7, CSI9, CSI12 }.
Table 2
But in view of the complexity of UE and the complexity of the complexity of network, particularly UE in real system, such as
It is proposed in the specifications such as 3GPP Rel-11, base station is UE configurations the CSI processes that measure and feed back（Hereinafter referred to as " matched somebody with somebody base station
Put CSI processes "）Number N conf determine that maximum can be 1,3 or 4 according to UE abilities.So, if base station configures for UE
Nconf CSI process is measured and fed back, how from all optional CSI processes（For example, it is in the case of 2-TP
4 kinds shown in table 1, be 12 kinds shown in table 2 in the case of 3-TP）Nconf suitable CSI processes are selected, just become one
A problem to be solved.
Nconf=3 CSI processes can be configured come exemplified by measuring and feeding back for UE by base station, in conventional method, for
The situation of 3-TP CoMP shown in table 2, one of which method are configured namely base station is matched somebody with somebody according to the CSI feedback of Rel-8
CSI processes are put as CSI1, CSI3, CSI5, another method is base station selected with same disturbance for 3（Namely CoMP measurements
Interference outside collection）CSI, at this time base station configure CSI processes as CSI10, CSI11, CSI12.It may be noted that these are traditional
The robustness of method（robust）Not enough, it is impossible to which preferable system performance is provided in various wireless communications environment.
The content of the invention
Select the method for channel state information process and execution above-mentioned for cooperative multi-point user the present invention provides a kind of
The base station of method.
A kind of method that cooperative multi-point CoMP user in wireless communication system selects channel state information CSI processes,
Including：
A1, the traffic load for obtaining the wireless communication system；
B1, the traffic load and pre-set one or more load-thresholds are compared to determine the channel radio
The loading level of letter system determines that different base stations configures CSI processes by different loading levels.
The B1 includes：
By the traffic load compared with pre-set first load-threshold；
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system is
It is low, it elects rollback CSI as one of base stations and configures CSI processes, and residue is selected from the corresponding CSI processes of serving BS
Base station configure CSI processes；
If the traffic load is more than first load-threshold, it is determined that the loading level of the wireless communication system is
Rollback CSI is excluded to configure outside CSI processes in base station by height, and corresponding from each base station that CoMP measurement sets include
It selects at least one in CSI processes as base station and configures CSI processes.
The B1 includes：
By the traffic load compared with pre-set first load-threshold；
If the traffic load is more than first load-threshold, it is determined that the loading level of the wireless communication system is
Rollback CSI is excluded to configure outside CSI processes in base station by height, and from each base station pair that the first CoMP measurement sets include
It selects at least one in the CSI processes answered as base station and configures CSI processes；
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system is
It is low, it elects rollback CSI as one of base stations and configures CSI processes, and regenerate number of base stations less than the first CoMP
2nd CoMP measurement sets of measurement set are selected surplus from the corresponding CSI processes in base station that the 2nd CoMP measurement sets include
Remaining base station configures CSI processes.
The B1 includes：
By the traffic load respectively compared with pre-set first load-threshold, the second load-threshold, wherein
First load-threshold is less than second load-threshold；
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system is
It is low, it elects rollback CSI as one of base stations and configures CSI processes, and residue is selected from the corresponding CSI processes of serving BS
Base station configure CSI processes；
If the traffic load is more than second load-threshold, it is determined that the loading level of the wireless communication system is
Rollback CSI is excluded to configure outside CSI processes in base station by height, and corresponding from each base station that CoMP measurement sets include
It selects at least one in CSI processes as base station and configures CSI processes；
If the traffic load is more than first load-threshold and less than second load-threshold, it is determined that the nothing
During the loading level of line communication system is, elects rollback CSI as one of base stations and configure CSI processes, and measured from CoMP
It selects at least one in the corresponding CSI processes of each cooperative base station that concentration includes as remaining base station and configures CSI processes.
Selecting base station from the corresponding CSI processes in base station and configuring CSI processes includes：
The Signal to Interference plus Noise Ratio of the corresponding each CSI processes in the base station is determined, according to the sequential selection of Signal to Interference plus Noise Ratio from big to small
The base station of predetermined number configures CSI processes.
The traffic load includes：Resource utilization and/or number of users.
A kind of method that cooperative multi-point CoMP user in wireless communication system selects channel state information CSI processes,
Including：
Parameter difference between the signal parameter of A2, the signal parameter for determining serving cell and cooperation cell；
B2, the parameter difference and pre-set one or more difference thresholds are compared to determine that the CoMP is used
The position at family determines that different base stations configures CSI processes for different user locations.
The B2 includes：
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI of serving BS
Remaining base station is selected in process and configures CSI processes；
If the parameter difference is less than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station by the second edge region in area, and include from CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell.
The B2 includes：
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is less than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station, and wrapped from the first CoMP measurement sets by the second edge region in area
It selects at least one in the corresponding CSI processes in each base station included as base station and configures CSI processes；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and it is small to regenerate number of base stations
It is corresponding from the base station that the 2nd CoMP measurement sets include in the 2nd CoMP measurement sets of the first CoMP measurement sets
Remaining base station is selected in CSI processes and configures CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell.
The B2 includes：
By the parameter difference respectively compared with pre-set first difference threshold, the second difference threshold, wherein
First difference threshold is more than second difference threshold；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI of serving BS
Remaining base station is selected in process and configures CSI processes；
If the parameter difference is less than second difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station by the second edge region in area, and include from CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；
If the parameter difference is less than first difference threshold and more than second difference threshold, it is determined that described
The position of CoMP user is located at the 3rd fringe region of serving cell, by rollback CSI elect as one of base station configure CSI into
Journey, and the remaining base of at least one conduct is selected from the corresponding CSI processes of each cooperative base station that CoMP measurement sets include
It stands configured CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell, described
Three fringe regions are between the first edge region and the second edge region.
Selecting base station from the corresponding CSI processes in base station and configuring CSI processes includes：
The Signal to Interference plus Noise Ratio of the corresponding each CSI processes in the base station is determined, according to the sequential selection of Signal to Interference plus Noise Ratio from big to small
The base station of predetermined number configures CSI processes.
The signal parameter includes：Reference Signal Received Power either Reference Signal Received Quality or Signal to Interference plus Noise Ratio.
A kind of method that cooperative multi-point CoMP user in wireless communication system selects channel state information CSI processes,
Including：
Determine the highest Nconf user dispatch state of the frequency of occurrences or base station transmission state in preset period of time, it is described
Nconf is configured the number of CSI processes by base station；
It is searched from the alternative collection of CSI processes corresponding with the Nconf user dispatch state or base station transmission state
CSI processes configure CSI processes as base station.
A kind of base station that channel state information CSI processes are selected for cooperative multi-point CoMP user, including：
First module, for obtaining the traffic load of wireless communication system；
Second unit, for the traffic load and pre-set one or more load-thresholds to be compared to determine
The loading level of the wireless communication system determines that different base stations configures CSI processes by different loading levels.
The second unit is used for：
By the traffic load compared with pre-set first load-threshold；
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system is
It is low, it elects rollback CSI as one of base stations and configures CSI processes, and residue is selected from the corresponding CSI processes of serving BS
Base station configure CSI processes；
If the traffic load is more than first load-threshold, it is determined that the loading level of the wireless communication system is
Rollback CSI is excluded to configure outside CSI processes in base station by height, and corresponding from each base station that CoMP measurement sets include
It selects at least one in CSI processes as base station and configures CSI processes.
A kind of base station that channel state information CSI processes are selected for cooperative multi-point CoMP user, including：
First module, for determining the parameter difference between the signal parameter of serving cell and the signal parameter of cooperation cell
Value；
Second unit, for the parameter difference and pre-set one or more difference thresholds to be compared to determine
The position of the CoMP user determines that different base stations configures CSI processes for different user locations.
The second unit is used for：
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI of serving BS
Remaining base station is selected in process and configures CSI processes；
If the parameter difference is less than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station by the second edge region in area, and include from CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell.
A kind of base station that channel state information CSI processes are selected for cooperative multi-point CoMP user, including：
First module, for determining the highest Nconf user dispatch state of the frequency of occurrences or base station in preset period of time
Transmission state, the Nconf are configured the number of CSI processes by base station；
Second unit, for being searched and the Nconf user dispatch state or base station from the alternative collection of CSI processes
The corresponding CSI processes of transmission state configure CSI processes as base station.
The method for a kind of selection CSI processes that the present invention is proposed by one or more embodiments, according to the communication of network
Load（traffic load）, such as resource utilization（resource usage）, number of users etc., select base station and configured
CSI processes.As can be seen that selection method provided in an embodiment of the present invention can adapt to various wireless communications environments, no matter logical
Preferable system performance can be provided in letter load height or low network environment, and can also be had when traffic load is low
Effect reduces the complexity of network scheduling.
In addition, the embodiment of the present invention can be according to the scheduling in the past period and/or transmission state or from clothes
The difference of the signal parameters such as the RSRP/RSRQ/SINR of cell of being engaged in and cooperation cell（Or the position of UE）, select base station and matched somebody with somebody
Put CSI processes.
Description of the drawings
Fig. 1 is configured the realization flow chart of the method for CSI processes by selection base station in one embodiment of the invention；
Fig. 2 is determines that base station configures the side of CSI processes in a specific embodiment of the invention according to the first load-threshold
Method schematic diagram；
Fig. 3 is determines that base station configures CSI processes in another of the invention specific embodiment according to the first load-threshold
Method schematic diagram；
Fig. 4 is determines base station institute in another of the invention specific embodiment according to the first load-threshold and the second load-threshold
Configure the method schematic diagram of CSI processes；
Fig. 5 is configured the realization flow chart of the method for CSI processes by selection base station in another embodiment of the present invention；
Fig. 6 is the structure diagram of base station in one embodiment of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, develop simultaneously embodiment referring to the drawings, right
The present invention is further described.
Fig. 1 is configured the realization flow chart of the method for CSI processes by selection base station in one embodiment of the invention.
In a step 101, the traffic load of wireless communication system is obtained.Specifically, can by resource utilization or
Number of users etc. judges traffic load.
In a step 102, the traffic load and pre-set one or more load-thresholds are compared to determine
The loading level of the wireless communication system determines that different base stations configures CSI processes by different loading levels.It can see
Go out, for wireless communication system when with different loading levels, the strategy that selection base station configures CSI processes is different.
Specifically, for loading level is low and both high states of loading level, select base station configure CSI processes its
In one difference lies in：Whether configuration retracts（fallback）For CSI to CoMP user, wherein rollback CSI is single cell transmission
CSI1 in CSI, such as table 1 or table 2.
When loading level is low, the interference in network is also small, and the performance of single cell transmission is good enough at this time, CoMP user
The probability for being scheduled to single cell transmission is significantly larger than the probability for doing CoMP transmission, so rollback CSI is when traffic load is relatively low
It is extremely important, it is necessary to be allocated to CoMP user；When loading level is high, network interferences are very big, and the performance that CoMP transmission is brought increases
Benefit is very big, so the probability that CoMP user is scheduled to CoMP transmission becomes larger, much larger than the probability of single cell transmission, at this point for
For CoMP user, CoMP CSI are more important than rollback CSI, thus rollback CSI be excluded configured in base station CSI processes it
Outside.
When loading level is low, base station configures CSI processes and is selected from the corresponding CSI processes of CS schemes, that is, from
It is selected in the CSI processes of various interference hypothesis from serving cell.For example, when TP1 is serving BS, the corresponding CSI of TP1
Process is the corresponding CSI processes of CS schemes.When loading level is high, it is corresponding from DPS schemes that base station configures CSI processes
It selects, therefore can be selected from all CSI processes in addition to rollback CSI in CSI processes.In other words, loading
When degree is high, all CSI processes in addition to rollback CSI are all optional CSI processes.
As can be seen that step 102 reduces the range of choice of CSI processes or the selection of CoMP scheme is determined.Negative
When load degree is low, the performance advantages of DPS schemes is not particularly evident compared with CS schemes, but it is dispatched complexity and is but much larger than
CS schemes.So from the corresponding CSI processes of CS schemes base station is selected to configure CSI processes, Ke Yi when loading level is low
Ensure the complexity of reduction measurement, scheduling etc. while system performance.In comparison, when loading level is high, DPS schemes
Performance gain is much larger than CS schemes, selects DPS schemes that can bring higher system performance at this time.
In a specific embodiment of the invention, the first load-threshold is pre-set.Obtaining the logical of wireless communication system
After letter load, by the traffic load compared with first load-threshold.It may be noted that the value of the first load-threshold can
To be configured based on experience value etc..
If the traffic load is less than first load-threshold, the loading level for determining the wireless communication system is
It is low, then using strategy 1 base station is selected to configure CSI processes, strategy 1 is specially：By rollback CSI elect as base station configure CSI into
Journey, and select remaining base station from the corresponding CSI processes of serving BS and configure CSI processes.For example, when base station is configured
When the number of CSI processes is Nconf, in addition to rollback CSI, it is also necessary to be selected from the corresponding CSI processes of serving BS
Nconf-1 base station configures CSI processes.If the traffic load is more than first load-threshold, the channel radio is determined
The loading level of letter system is height, then using strategy 2 base station is selected to configure CSI processes, and strategy 2 is specially：Rollback CSI is arranged
In addition to CSI processes are configured in base station, and it is elected to from the corresponding CSI processes in each base station that CoMP measurement sets include
Few one is used as base station to configure CSI processes.Assuming that CoMP measurement sets include TP1, TP2, then from the corresponding CSI processes of TP1
One is at least selected as base station and configures CSI processes, one is also at least selected from the corresponding CSI processes of TP2 as base station
Configured CSI processes, each base station included so as to ensure CoMP measurement sets have corresponding CSI processes to be selected.When logical
When letter load is equal to the first load-threshold, any one of above two strategy selection base station may be employed and configure CSI processes,
It need not be particularly limited to.
In this embodiment, the height of loading level is weighed using the first load-threshold.It is of course also possible to use its
Its mode determines the height of loading level.
By taking 3-TP as an example, it is assumed that base station configures the number N conf=3 of CSI processes, as shown in Fig. 2, when traffic load compared with
It is low（I.e. loading level is low, in low area）When, rollback CSI（See the vertical line filling region in Fig. 2）It needs to be selected as base station institute
Configuration CSI processes are supplied to CoMP user, and remaining 2 base stations configure CSI processes and also selected from the CSI of serving cell,
The CSI of middle serving cell can be：CSI process of the signal section from serving BS.For example, when TP1 is serving BS, table
CSI1, CSI2, CSI6, CSI10 in 2 are the CSI alternative collections of serving BS namely the corresponding CSI processes of serving BS.
When traffic load is higher（I.e. loading level is high, in high area）When, all CSI processes of base station configuration are CoMP
CSI.Specifically, selected in the CSI alternative collections for each base station that can include from CoMP measurement sets at least one as base station institute
Configure CSI processes.For example, when TP1 is serving BS, TP2 is the first cooperative base station, TP3 is the second cooperative base station, from TP1
CSI alternative collections { CSI1, CSI2, CSI6, CSI10 }（That is alternative collection 1）In select 1 base station and configure CSI processes, from TP2
CSI alternative collections { CSI3, CSI4, CSI8, CSI11 }（That is alternative collection 2）In select 1 base station and configure CSI processes, from TP3
CSI alternative collections { CSI5, CSI7, CSI9, CSI12 }（That is alternative collection 3）In select 1 base station and configure CSI processes.
In another specific embodiment of the invention, the first load-threshold is pre-set.Obtaining wireless communication system
After traffic load, by the traffic load compared with the first load-threshold.If the traffic load is more than the described first load
Thresholding, it is determined that the loading level of the wireless communication system is height, by rollback CSI exclude to configure in base station CSI processes it
Outside, and from the corresponding CSI processes in each base station that the first CoMP measurement sets include at least one conduct base station is selected to be matched somebody with somebody
Put CSI processes.If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system
It to be low, elect rollback CSI as one of base stations and configures CSI processes, and regenerate number of base stations less than described first
2nd CoMP measurement sets of CoMP measurement sets are selected from the corresponding CSI processes in base station that the 2nd CoMP measurement sets include
Go out remaining base station and configure CSI processes.When traffic load is equal to the first load-threshold, may be employed in above two strategy
Any selection base station configure CSI processes.
As can be seen that as shown in figure 3, after being determined whether rollback CSI needs to configure, base station configures CSI processes and adopts
It selects using the following method：When traffic load is in high area, without using rollback CSI, then base station configures CSI processes from remaining
The corresponding CSI processes of 3-TP CoMP（See the right oblique line filling region in Fig. 3）Middle selection；When traffic load is in low area, make
With rollback CSI（See the vertical line filling region in Fig. 3）, it is corresponding from other 2-TP CoMP that remaining base station configures CSI processes
CSI processes（See the left oblique line filling region in Fig. 3）Middle selection.Herein, 3-TP CoMP be the first CoMP measurement sets, 2-TP
CoMP is the 2nd CoMP measurement sets.
Using the above method, when loading level is low, the performance advantage of 3-TP CoMP is not special compared with 2-TPCoMP
Substantially, but it dispatches complexity but much larger than 2-TP CoMP, so configuring 2-TP CoMP corresponding CSI when loading level is low
Process can reduce the complexity of measurement, scheduling etc. while system performance is ensured.When loading level is high, 3-TP CoMP
Performance gain much larger than 2-TPCoMP, select 3-TP CoMP that can bring higher system performance at this time.
In another specific embodiment of the invention, the first load-threshold and the second load-threshold are pre-set, wherein the
One load-threshold is less than the second load-threshold, the values of the two thresholdings can be configured based on experience value etc., such as Fig. 4 institutes
Show.
Specifically, obtain wireless communication system traffic load after, by the traffic load respectively with it is pre-set
First load-threshold, the second load-threshold are compared, wherein first load-threshold is less than second load-threshold.Such as
The fruit traffic load is less than first load-threshold, determines the loading level of the wireless communication system to be low, then using plan
Slightly 1 selection base station configures CSI processes, and strategy 1 is specially：It elects rollback CSI as one of base stations and configures CSI processes,
And it selects remaining base station from other corresponding CSI processes of serving BS and configures CSI processes.If the traffic load is more than
Second load-threshold determines that the loading level of the wireless communication system for height, then selects base station to be configured using strategy 2
CSI processes, strategy 2 are specially：Rollback CSI is excluded to configure outside CSI processes in base station, and is included from CoMP measurement sets
The corresponding CSI processes in each base station in select at least one as base station and configure CSI processes.If the traffic load is more than
First load-threshold and less than second load-threshold, during the loading level for determining the wireless communication system is, then
Using strategy 3 base station is selected to configure CSI processes, strategy 3 is specially：It elects rollback CSI as one of base stations and configures CSI
Process, and select from the corresponding CSI processes of each cooperative base station that CoMP measurement sets include at least one as remaining
Base station configures CSI processes.When traffic load is equal to the first load-threshold, strategy 1 may be employed or strategy 3 selects base station institute
Configure CSI processes；When traffic load is equal to the second load-threshold, strategy 2 may be employed or strategy 3 selects base station to be configured
CSI processes.
As can be seen that it is more than the second load-threshold in low area, traffic load when traffic load is less than the first load-threshold
When in high area, similar with the operation of the respective communication load area in Fig. 2, details are not described herein again.
When the traffic load of system is in middle area namely traffic load is more than the first load-threshold and less than the second load
During thresholding, CSI processes are configured using rollback CSI as essential base station, remaining base station configures CSI processes and measured from CoMP
It is further selected in the corresponding CSI processes in other base stations in addition to serving BS of concentration, such as from the corresponding alternative collections 2 of TP2
It is selected in alternative collection 3 corresponding with TP3.It specifically, can be according to the most strong principles of SINR from the corresponding CSI processes in other base stations
Selection base station configures CSI processes, and the process is referring specifically to following description.With reference to table 2, at one in the specific implementation, ought be
The resource utilization of system is between two thresholdings, and when being medium load, base station is that the CSI processes of its CoMP user configuration are
CSI1、CSI11、CSI12。
After the range of choice for reducing CSI processes by load-threshold in the above-described embodiments, base station can be according to CSI processes
Signal to Interference plus Noise Ratio（SINR, Signal to Interference plus Noise Ratio）Intensity size further select.
Certainly, if user has only fed back 3 kinds of CSI processes, base station can first carry out CSI and update to obtain other kinds of CSI processes, then
It is selected according to SINR is further.It will for example, the CSI processes with maximum SINR in the corresponding CSI processes of base station A can be chosen
User feedback is asked, base station A herein can be any in serving BS cooperative base station or CoMP measurement sets
A base station.
At one in the specific implementation, assuming that base station will be that CoMP user configures 3 CSI processes.If the base station find that network
Resource utilization less than pre-determined threshold, the state low in traffic load, then retract CSI first（Namely CSI1）It is chosen,
Then remaining 2 select in the corresponding CSI processes of CS schemes according to SINR intensity, that is, in CSI2, CSI6, CSI10
Middle selection, it is assumed that the magnitude relationship of SINR is：CSI10>CSI2>CSI6.So, base station can be that the CoMP user configures
CSI1, CSI10 and CSI2 are measured and fed back.
If the base station find that the resource utilization of network be higher than pre-determined threshold, the state high in traffic load, then first
It is determined that for the CoMP user, rollback CSI is not selected.Then, for the corresponding CSI of remaining DPS schemes into
Journey makes choice under each TP according to SINR intensity.Specifically, from the CSI processes in addition to rollback CSI of TP1（I.e.
CSI2、CSI6、CSI10）In select the CSI10 of SINR maximums, obtained from measurement（Or update what is obtained）4 from TP2
CSI processes（That is CSI3, CSI4, CSI8, CSI11）In select the CSI11 of SINR maximums, from 4 CSI processes from TP3（I.e.
CSI5、CSI7、CSI9、CSI12）In select the CSI12 of SINR maximums.Finally, base station for the CoMP user be configured with CSI10,
CSI11 and CSI12 is measured and fed back.
At another in the specific implementation, assuming that base station is more than 3 for the CSI processes of CoMP user configuration.In traffic load
In the state of height, after selecting CSI10, CSI11, CSI12, following any method may be employed in the selection of other CSI processes.
For example, the several of SINR maximums are selected from unchecked CSI processes；Alternatively, from from the CSI processes of serving cell TP1
Select the several of SINR maximums；Alternatively, SINR maximums are selected respectively from the CSI alternative collections for come from each TP, further according to each
The priority of TP further selects, for example the priority of TP1 is higher than TP2, and TP2 is higher than TP3.
It is configured in base station after CSI processes select completely, configures CSI processes according to the base station and user is measured and match somebody with somebody
It puts, subsequent user will be to the corresponding CSI processes of base station feedback, so that base station is scheduled using the CSI processes received, specific mistake
Journey can refer to the prior art, and details are not described herein again.
In another embodiment, can be measured according to user, feed back from serving cell and cooperation cell
Reference Signal Received Power（RSRP, Reference Signal Receiving Power）, Reference Signal Received Quality
（RSRQ, Reference Signal Receiving Quality）, the signal parameters such as SINR difference, base station to be selected to be matched somebody with somebody
Put CSI processes.
For example, when the difference between the signal parameter of serving cell and the signal parameter of cooperation cell is bigger, illustrate to use
Family position is more biased towards in serving cell, being then scheduling to the probability bigger of serving cell, therefore more small for user configuration service
The corresponding CSI processes in area, select to more maximum probability the CSI processes in CS schemes in other words.Conversely, when difference is smaller, explanation
User is in the position compared with edge, closely located with serving cell and cooperation cell, and the user is serviced small in this case
Probability in area and cooperation cell scheduling is close, so when base station selects CSI processes for the CoMP user, from serving cell and
The selectable probability of CSI processes of cooperation cell is similar, configures to more maximum probability the CSI processes in DPS schemes in other words.
Another embodiment of the present invention provides a kind of cooperative multi-point CoMP user selection letter in wireless communication system
The method of channel state information CSI processes, flow are shown in Fig. 5.
In step 501, the parameter difference between the signal parameter of serving cell and the signal parameter of cooperation cell is determined.
In step 502, the parameter difference and pre-set one or more difference thresholds are compared to determine the CoMP
The position of user determines that different base stations configures CSI processes for different user locations.As can be seen that CoMP user exists
During the difference of serving cell present position, the strategy that selection base station configures CSI processes is also different.
At one in the specific implementation, step 502 includes：
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI of serving BS
Remaining base station is selected in process and configures CSI processes；
If the parameter difference is less than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station by the second edge region in area, and include from CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；Wherein, the first edge area
Domain is than the second edge region close to the center of the serving cell.Herein, each base station is corresponding from CoMP measurement sets
When determining that base station configures CSI processes in CSI processes, it can be made choice according to the most strong principles of SINR.
At one in the specific implementation, step 502 includes：
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is less than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station, and wrapped from the first CoMP measurement sets by the second edge region in area
It selects at least one in the corresponding CSI processes in each base station included as base station and configures CSI processes；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and it is small to regenerate number of base stations
It is corresponding from the base station that the 2nd CoMP measurement sets include in the 2nd CoMP measurement sets of the first CoMP measurement sets
Remaining base station is selected in CSI processes and configures CSI processes（For example, it can be made choice according to the most strong principles of SINR）；
Wherein, the first edge region than the second edge region close to the center of the serving cell.
At one in the specific implementation, step 502 includes：
By the parameter difference respectively compared with pre-set first difference threshold, the second difference threshold, wherein
First difference threshold is more than second difference threshold, the values of the two thresholdings can be set based on experience value etc.
It puts；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI of serving BS
Remaining base station is selected in process and configures CSI processes（For example, it can be made choice according to the most strong principles of SINR）；
If the parameter difference is less than second difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station by the second edge region in area, and include from CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；
If the parameter difference is less than first difference threshold and more than second difference threshold, it is determined that described
The position of CoMP user is located at the 3rd fringe region of serving cell, by rollback CSI elect as one of base station configure CSI into
Journey, and the remaining base of at least one conduct is selected from the corresponding CSI processes of each cooperative base station that CoMP measurement sets include
It stands configured CSI processes（For example, it can be made choice according to the most strong principles of SINR）；
Wherein, the first edge region than the second edge region close to the center of the serving cell, described
Three fringe regions are between the first edge region and the second edge region.That is, first edge region is edge
By paracentral region, the 3rd fringe region is time fringe region, and the region at second edge region Ze Wei edges.
Specifically, selecting base station from the corresponding CSI processes in base station and configure CSI processes includes：
The Signal to Interference plus Noise Ratio of the corresponding each CSI processes in the base station is determined, according to the sequential selection of Signal to Interference plus Noise Ratio from big to small
The base station of predetermined number configures CSI processes.Base station herein can be serving BS or cooperative base station, either
Any one base station that CoMP measurement sets include.
In the above-described embodiments, the signal parameter includes：Reference Signal Received Power or reference signal receive matter
Amount or Signal to Interference plus Noise Ratio.
In another of the invention embodiment, most state that can be scheduled according to each user in the past period or
Person is that most frequent state is transmitted in each base station that the past period CoMP measurement set includes, to determine that base station configures CSI
Process.Specifically, this method includes：Determine the highest Nconf user dispatch state of the frequency of occurrences or base in preset period of time
It stands transmission state, the Nconf is configured the number of CSI processes by base station；From the alternative collection of CSI processes search with it is described
Nconf user's dispatch state or the corresponding CSI processes of base station transmission state configure CSI processes as base station.Wherein, use
Base Transmitter state when family dispatch state refers to dispatching the user, and which user's quilt base station transmission state is then regardless of
The state that can be all recorded in scheduling.It is illustrated below by taking Nconf=3 as an example namely base station will be that CoMP user configures 3
CSI processes are measured and fed back.Assuming that in past 100ms, CoMP UE A are scheduled most 3 being transmitted
State is respectively：1st, TP1 sends data to CoMP UE A, TP2 and TP3 and is in open state（non-muting）；2nd, TP1 is sent
Data are in off status to CoMP UE A, TP2（muting）, TP3 is in open state；3rd, TP2 sends data to CoMP UE A,
TP1 is in off status, and TP3 is in open state.Specifically, TP is in off status（muting）When, the power of data channel is
0, but the power of control channel is not 0；TP is in open state（non-muting）When, data channel and control channel
Power is not 0.At this point, it is CSI1, CSI2, CSI4 in table 1 that base station, which is 3 CSI processes of CoMP UE A configurations,.It needs
It points out, in this example, the 3 most states that are scheduled are not directed to data and are intended only as disturbing from TP3 transmissions or TP3, institute
From the table 1 for 2-TP CoMP base station can be selected to configure CSI processes.It in other cases, can be according to each user
Most state that is scheduled selects base station to configure CSI processes from the table 2 for 3-TPCoMP.
The selection method that the embodiment of the present invention refers to can be performed by base station, thus base station need to increase corresponding function with
Realize any one or more above-mentioned selection method.
A specific embodiment of the invention provide it is a kind of for cooperative multi-point CoMP user select channel state information CSI into
The base station of journey, composition as shown in fig. 6, including：
First module 601, for obtaining the traffic load of wireless communication system；
Second unit 602, for the traffic load and pre-set one or more load-thresholds to be compared to
It determines the loading level of the wireless communication system, determines that different base stations configures CSI processes by different loading levels.
In above-mentioned base station, second unit 602 realizes method shown in Figure 2, is specifically used for：
By the traffic load compared with pre-set first load-threshold；
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system is
It is low, it elects rollback CSI as one of base stations and configures CSI processes, and residue is selected from the corresponding CSI processes of serving BS
Base station configure CSI processes；
If the traffic load is more than first load-threshold, it is determined that the loading level of the wireless communication system is
Rollback CSI is excluded to configure outside CSI processes in base station by height, and corresponding from each base station that CoMP measurement sets include
It selects at least one in CSI processes as base station and configures CSI processes.
It may be noted that second unit 602 can also use Fig. 3 and method shown in Fig. 4 to realize that details are not described herein again.
Another specific embodiment of the invention provides a kind of for cooperative multi-point CoMP user selection channel state information CSI
The base station of process, including：
First module, for determining the parameter difference between the signal parameter of serving cell and the signal parameter of cooperation cell
Value；Second unit, it is described for the parameter difference to be compared to determine with pre-set one or more difference thresholds
The position of CoMP user determines that different base stations configures CSI processes for different user locations.
In above-mentioned base station, second unit is specifically used for：
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is more than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
The first edge region in area elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI of serving BS
Remaining base station is selected in process and configures CSI processes；
If the parameter difference is less than first difference threshold, it is determined that it is small that the position of the CoMP user is located at service
Rollback CSI is excluded to configure outside CSI processes in base station by the second edge region in area, and include from CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；Wherein, the first edge area
Domain is than the second edge region close to the center of the serving cell.
It these are only an exemplary illustration for realizing second unit, all choosings mentioned in the method for the present invention embodiment
Similar mode realization can be used in selection method, and details are not described herein again.
Another specific embodiment of the invention provides a kind of for cooperative multi-point CoMP user selection channel state information CSI
The base station of process, including：
First module, for determining the highest Nconf user dispatch state of the frequency of occurrences or base station in preset period of time
Transmission state, the Nconf are configured the number of CSI processes by base station；
Second unit, for being searched and the Nconf user dispatch state or base station from the alternative collection of CSI processes
The corresponding CSI processes of transmission state configure CSI processes as base station.
Method provided in an embodiment of the present invention can determine the number of the CSI processes for user configuration measurement in base station
In the case of Nconf, go out suitable CSI processes according to the various parameters of system and condition selecting for user configuration so that system
Superior performance can be reached under various traffic loads.Moreover, the embodiment of the present invention can be according to wireless environment to CoMP
Scheme makes choice, and so as to reduce the complexity of systematic survey and network scheduling etc., is particularly reduced when loading level is low
The complexity of system, while ensure that system performance.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of protection of the invention.
Claims (16)
1. a kind of method that cooperative multi-point CoMP user in wireless communication system selects channel state information CSI processes,
It is characterized in that, including：
A1, the traffic load for obtaining the wireless communication system；
B1, the traffic load and pre-set one or more load-thresholds are compared to determine the wireless communication system
The loading level of system determines that different base stations configures CSI processes by different loading levels；
The B1 includes：By the traffic load compared with pre-set first load-threshold；
If the traffic load is more than first load-threshold, it is determined that the loading level of the wireless communication system is height,
Rollback CSI is excluded to configure outside CSI processes in base station, and it is corresponding from each base station that the first CoMP measurement sets include
It selects at least one in CSI processes as base station and configures CSI processes；
The first CoMP measurement sets include serving BS and all cooperative base stations.
2. according to the method described in claim 1, it is characterized in that, the B1 further comprises：
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system to be low,
It elects rollback CSI as one of base stations and configures CSI processes, and select from the corresponding CSI processes of serving BS remaining
Base station configures CSI processes.
3. according to the method described in claim 1, it is characterized in that, the B1 further comprises：
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system to be low,
It elects rollback CSI as one of base stations and configures CSI processes, and regenerate number of base stations and measured less than the first CoMP
2nd CoMP measurement sets of collection, are selected remaining from the corresponding CSI processes in base station that the 2nd CoMP measurement sets include
Base station configures CSI processes.
4. according to the method described in claim 1, it is characterized in that, the B1 further comprises：
By the traffic load compared with pre-set second load-threshold, wherein second load-threshold is less than institute
State the first load-threshold；
If the traffic load is less than second load-threshold, it is determined that the loading level of the wireless communication system to be low,
It elects rollback CSI as one of base stations and configures CSI processes, and select from the corresponding CSI processes of serving BS remaining
Base station configures CSI processes；
If the traffic load is more than second load-threshold and less than first load-threshold, it is determined that the channel radio
During the loading level of letter system is, elects rollback CSI as one of base stations and configure CSI processes, and from the first CoMP
It selects at least one in the corresponding CSI processes of each cooperative base station that measurement set includes as remaining base station and configures CSI
Process.
5. according to claim 2-4 any one of them methods, which is characterized in that select base from the corresponding CSI processes in base station
Configured CSI processes of standing include：
It determines the Signal to Interference plus Noise Ratio of the corresponding each CSI processes in the base station, makes a reservation for according to the sequential selection of Signal to Interference plus Noise Ratio from big to small
The base station of number configures CSI processes.
6. according to claim 1-4 any one of them methods, which is characterized in that the traffic load includes：Resource utilization,
And/or number of users.
7. a kind of method that cooperative multi-point CoMP user in wireless communication system selects channel state information CSI processes,
It is characterized in that, including：
Parameter difference between the signal parameter of A2, the signal parameter for determining serving cell and cooperation cell；
B2, the parameter difference and pre-set one or more difference thresholds are compared to determine the CoMP user
Position determines that different base stations configures CSI processes for different user locations；
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is less than first difference threshold, it is determined that the position of the CoMP user is located at serving cell
Rollback CSI is excluded to configure outside CSI processes in base station by second edge region, and include from the first CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；
The first CoMP measurement sets include serving BS and all cooperative base stations.
8. the method according to the description of claim 7 is characterized in that the B2 further comprises：
If the parameter difference is more than first difference threshold, it is determined that the position of the CoMP user is located at serving cell
First edge region elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI processes of serving BS
In select remaining base station and configure CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell.
9. the method according to the description of claim 7 is characterized in that the B2 further comprises：
If the parameter difference is more than first difference threshold, it is determined that the position of the CoMP user is located at serving cell
First edge region elects rollback CSI as one of base stations and configures CSI processes, and regenerates number of base stations less than institute
State the 2nd CoMP measurement sets of the first CoMP measurement sets, from the corresponding CSI in base station that the 2nd CoMP measurement sets include into
Remaining base station is selected in journey and configures CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell.
10. the method according to the description of claim 7 is characterized in that the B2 further comprises：
By the parameter difference compared with pre-set second difference threshold, wherein second difference threshold is more than institute
State the first difference threshold；
If the parameter difference is more than second difference threshold, it is determined that the position of the CoMP user is located at serving cell
First edge region elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI processes of serving BS
In select remaining base station and configure CSI processes；
If the parameter difference is less than second difference threshold and more than first difference threshold, it is determined that the CoMP is used
The position at family is located at the 3rd fringe region of serving cell, and electing rollback CSI as one of base stations configures CSI processes, and
It is selected from the corresponding CSI processes of each cooperative base station that the first CoMP measurement sets include at least one as remaining
Base station configures CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell, the 3rd side
Edge region is between the first edge region and the second edge region.
11. according to claim 8-10 any one of them methods, which is characterized in that selected from the corresponding CSI processes in base station
Base station, which configures CSI processes, to be included：
It determines the Signal to Interference plus Noise Ratio of the corresponding each CSI processes in the base station, makes a reservation for according to the sequential selection of Signal to Interference plus Noise Ratio from big to small
The base station of number configures CSI processes.
12. according to claim 7-10 any one of them methods, which is characterized in that the signal parameter includes：Reference signal
Receive power either Reference Signal Received Quality or Signal to Interference plus Noise Ratio.
13. a kind of base station that channel state information CSI processes are selected for cooperative multi-point CoMP user, which is characterized in that including：
First module, for obtaining the traffic load of wireless communication system；
Second unit, it is described for the traffic load to be compared to determine with pre-set one or more load-thresholds
The loading level of wireless communication system determines that different base stations configures CSI processes by different loading levels；
By the traffic load compared with pre-set first load-threshold；
If the traffic load is more than first load-threshold, it is determined that the loading level of the wireless communication system is height,
Rollback CSI is excluded to configure outside CSI processes in base station, and it is corresponding from each base station that the first CoMP measurement sets include
It selects at least one in CSI processes as base station and configures CSI processes；
The first CoMP measurement sets include serving BS and all cooperative base stations.
14. base station according to claim 13, which is characterized in that the second unit is used for：
If the traffic load is less than first load-threshold, it is determined that the loading level of the wireless communication system to be low,
It elects rollback CSI as one of base stations and configures CSI processes, and select from the corresponding CSI processes of serving BS remaining
Base station configures CSI processes.
15. a kind of base station that channel state information CSI processes are selected for cooperative multi-point CoMP user, which is characterized in that including：
First module, for determining the parameter difference between the signal parameter of serving cell and the signal parameter of cooperation cell；
Second unit, it is described for the parameter difference to be compared to determine with pre-set one or more difference thresholds
The position of CoMP user determines that different base stations configures CSI processes for different user locations；
By the parameter difference compared with pre-set first difference threshold；
If the parameter difference is less than first difference threshold, it is determined that the position of the CoMP user is located at serving cell
Rollback CSI is excluded to configure outside CSI processes in base station by second edge region, and include from the first CoMP measurement sets
It selects at least one in the corresponding CSI processes in each base station as base station and configures CSI processes；
The first CoMP measurement sets include serving BS and all cooperative base stations.
16. base station according to claim 15, which is characterized in that the second unit is used for：
If the parameter difference is more than first difference threshold, it is determined that the position of the CoMP user is located at serving cell
First edge region elects rollback CSI as one of base stations and configures CSI processes, and from the corresponding CSI processes of serving BS
In select remaining base station and configure CSI processes；
Wherein, the first edge region than the second edge region close to the center of the serving cell.
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| CN105307210B (en) * | 2014-06-27 | 2018-11-30 | 中国移动通信集团公司 | A kind of collaboration method and device of minizone |
| JP2016143916A (en) * | 2015-01-29 | 2016-08-08 | ソニー株式会社 | Device |
| CN107547164A (en) * | 2016-06-27 | 2018-01-05 | 索尼公司 | Electronic installation and method in mobile base station |
| CN108282254B (en) * | 2017-01-06 | 2020-10-23 | 华为技术有限公司 | Channel state information reporting method, base station and user equipment |
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