CN104219709B - A kind of selection method for LTE-A COMP cooperation set - Google Patents
A kind of selection method for LTE-A COMP cooperation set Download PDFInfo
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Abstract
The invention discloses a kind of selection methods for LTE A COMP cooperation set, and according to path loss, the adjacent area of serving cell and serving cell where user is divided candidate cooperation style set；User judges whether user is edge customer according to reporting neighboring cell list, and according to neighboring cell list；It determines the non-cooperating element in neighboring cell list, and deletes non-cooperating element in candidate's cooperation style set to form optimization collaboration set；The signal-to-noise ratio of each style set in optimization collaboration set is calculated separately, and selects the style set with maximum signal to noise ratio as optimal collaboration set；It when the pattern in optimal collaboration set is less than 1, abandons cooperating, when the pattern in optimal collaboration set is more than or equal to 1, cooperation selection is completed.The present invention solves the select permeability of cooperation cell during LTE A system multipoint cooperatives, improves the performance of edge customer and the average behavior of community user by half dynamic cooperative set selection mode.
Description
Technical field
The present invention relates to mobile communication long term evolution (LTE-A) systems technology fields, and LTE-A is directed in particular to one kind
The selection method of COMP cooperation set.
Background technology
In recent years, with the development of mobile communication technology, although communication system has the tenability of radio communication service
Apparent raising, while there has also been higher demands multimedia service of the user to high-speed, high quality.Therefore, next
In the research of third-generation mobile communication technology, spectrum efficiency, transmission rate, throughput of system and cell-edge performance etc. are also carried
Higher requirement is gone out.
Lte-a system uses identical networking technology, the access way of OFDM that the information of intra-cell users is made to be carried on mutually
In orthogonal different sub-carrier, the multi-access inference between intra-cell users is effectively prevented, but inter-cell interference can not inhibit.It is right
For Cell Edge User, useful signal intensity is small, and the interference signal intensity for being simultaneously from neighboring community is big, and which has limited small
The signal-to-noise ratio (SINR) of area edge user, leads to its throughput degradation so that the service quality that edge customer cannot be satisfied with, sternly
The raising of system performance and system fairness is constrained again.Therefore, inter-cell interference inhibition, which becomes in lte-a system, urgently solves
Certainly the problem of.
Cooperative multi-point (CoMP) transmission technology can effectively improve community marginal user performance, throughput of system be improved, close
Extensive concern and the research of industry are caused over year, and as the important research item of 3GPP LTE-Advanced standardization efforts
One of mesh.
The selection of cooperation set mainly has static cooperation mode and dynamic cooperative mode.Static cooperation set is according to one
Fixed criterion is fixedly selected several eNodeB and cooperates, and larger several eNodeB, static cooperation are interfered in usually selection
Mode is divided cooperation set by fixed form in network design, and user is after accessing its main serving cell,
It is entered in a fixed collaboration region according to the planning of the position of cell and network.Static cooperation mode is realized simply, right
Change in user location, can not accomplish the switching of collaboration set well.
Dynamic cooperative mode is then each user according to channel status, selects several suitable base station composition collaboration sets
It closes, with the variation of user location, needs to update the base station of selected cooperation into Mobile state.Network side needs to know each
Which base station collaboration user has selected gather as cooperation, and needs the situation of change of timing tracking user collaboration set, does
To real-time update and maintenance, the complexity that system is realized will greatly improve.
Invention content
The purpose of the present invention is be directed to static cooperation mode in existing cooperation set selection mode not being suitable for user location
The bigger defect of variation, dynamic cooperative mode system complexity, it is proposed that a kind of half dynamic cooperative set selection mode, to
The select permeability for solving cooperation cell during lte-a system multipoint cooperative, improves the performance and community user of edge customer
Average behavior.
To achieve the above object, a kind of selection method for LTE-A COMP cooperation set designed by the present invention, packet
Include following steps：
1) according to path loss, the adjacent area of serving cell and serving cell where user is divided into candidate cooperation style set；
2) the reporting of user neighboring cell list, and judge whether the user is edge customer according to neighboring cell list, if institute
It is non-edge user to state user, abandons cooperating, if the user is edge customer, is gone to step 3)；
3) it determines the non-cooperating element in the neighboring cell list, and non-cooperating element in the candidate style set that cooperates is deleted
Optimize collaboration set except being formed；
4) calculate separately optimization collaboration set in each pattern signal-to-noise ratio, and select have maximum signal to noise ratio style set as
Optimal collaboration set；
5) it when the pattern in optimal collaboration set is less than 1, abandons cooperating, when the pattern in optimal collaboration set is more than or equal to 1
When, cooperation selection is completed.
Preferably, candidate cooperation style set is static cooperation set in the step 1), and triggering and startup are by network
What side was initiated.Pattern in the candidate cooperation style set is three one group of elements.
Preferably, reporting of user neighboring cell list described in the step 2) the specific steps are：Whether judge user successively
The each adjacent area for meeting serving cell enters the condition of 36.331 agreement A3 events, and the adjacent area is included in adjacent area row if meeting
Table is ignored if being unsatisfactory for.The condition for entering 36.331 agreement A3 events is the reception power of adjacent area reference signal
The result that the measurement result Mn of RSRP subtracts the lag parameter Hys of the event is added more than the RSRP measurement results Ms of serving cell
The offset parameter Off of the event, i.e. Mn-Hys>Ms+Off；The A3 events leave the RSRP measurement results that condition is adjacent area
Mn, in addition the result after the lag parameter Hys of the event is more than the RSRP measurement results Ms of serving cell plus the inclined of the event
Shifting parameter Off, i.e. Mn+Hys<Ms+Off.
Preferably, non-cooperating element described in the step 3) is that X2 interface transmits extra-heavy element in neighboring cell list
Or and transfer point signal time delay be more than length of the cycle CP element.
Preferably, signal-to-noise ratio in the step 4)Calculation formula be：
Wherein：K is user, k/It is the other users in cooperation set, CkTo optimize collaboration set,For candidate's cooperation pattern
Centralized base-station b is to the channel matrix of user k, Wk bFor the joint pre-coding matrix of user's k data vectors, Wk iIt is sweared for user's i data
The joint pre-coding matrix of amount,For user k/The joint pre-coding matrix of data vector, N0For white Gaussian noiseIt is candidate
The channel matrix of other base station i to user k in style set,It is the base station j to user k in base station group in non-candidate style set
Channel matrix, C be entire base station cluster.
The principle of the present invention is as follows：
1, system model is established
The mixed channel matrix of virtual MIMO system is：
Refer to the channel matrix of base station b to user k in the user group in cell cooperative,It isTransposition square
Battle array, is shown in Fig. 1.The data vector matrix of user k is Xk, specific formula is as follows：
LkFor the number of plies of user k, user k is to belong to collaboration user collection Ck, the joint pre-coding matrix of user's k data vectors
For Wk b.K user received signal, ykIt is multiplied by pre-coding matrix multiplied by with the user data vector of reception, specifically for channel matrix
Formula indicates as follows：
Wherein Section 2 be collaboration set in interference of the other users signal to k user, Section 3 be non-cooperating collection in other
Interference of the subscriber signal to k user, nkRefer to that variance isWhite Gaussian noise.Therefore when not cooperating,
Signal-to-noise ratio SINR can be expressed as：
Useful signal can become interference signal using minizone cooperation, therefore formula can be expressed as：
2, the selection of collaboration user
Report configuration in measuring configuration is that the periodic triggers based on A3 events report, when the measurement of user service cell
As a result meet trigger conditions, then measure result and report, as shown in Figure 2.In the frequency for not considering adjacent area and serving cell
In the case that rate is biased with Cell Individual Offset, the condition into A3 events is：The measurement result Mn of adjacent area RSRP, subtracts the thing
The result of the lag parameter Hys (parameter that Hys sets for the number of restriction event triggering report) of part is more than serving cell
RSRP measurement results Ms adds the offset parameter Off of the event；Leaving the condition of A3 events is：The RSRP measurement results of adjacent area
Mn, in addition the result after the lag parameter Hys of the event is more than the RSRP measurement results Ms of serving cell plus the inclined of the event
Shifting parameter Off.The condition for specifically entering and leaving this event is as follows：
Into the condition of this event：Mn-Hys>Ms+Off (6)
Leave the condition of this event：Mn+Hys<Ms+Off (7)
If the measured value of serving cell meets the condition into this event, and when continuing Time-To-Trigger
Between, then it measures and reports.
It is reported according to A3 affairs, when the cell list reported is empty, user-center user need not carry out
Multipoint cooperative；When the cell list non-empty reported, which is edge customer, and the choosing of cooperation set is carried out for the user
It selects.
3, the selection of cooperation set
3.1, static division cooperation set
Network side according to path loss by where user serving cell and adjacent cell fixation be divided into several maximum possible
Candidate pattern collection, according to the definition in agreement 3GPP TR25.942, specific path loss formula is as follows：
L=40 × (1-4 × 10-3Δhb)log10(R)-18×log10(Δhb)+21×log(f)+80dB (8)
R is the distance between user and base station (Km), and f is carrier frequency (Hz), Δ hbIt is base station antenna height and building
The relative altitude (Km) of object average height.
3.2, cooperation set Φ is determined
When user is confirmed as edge customer, Φ is the set of cells that edge customer reports, i.e. cooperative cluster.According to adjacent area
The RSRP (the reception power of reference signal) reported puts in order, and serving cell is according to X2 mouths (X2 current in the cell reported
Interface realizes the interconnection between eNB, is the equal of the interface of base station and base station) traffic load is bigger or the letter of transfer point
Number time delay is more than length of the cycle CP, deletes a part of candidate cell, reduces the range of candidate cell Φ.
3.3, the selection of collaboration set
Calculate separately cooperation set style setIt selects maximumStyle set as whole
A candidate collection, the cell in the set is as cooperation cell；It calculates in the regionCalculation formula is as follows：
Wherein：K is user, CkTo optimize collaboration set,For the channel square of candidate cooperation pattern centralized base-station b to user k
Battle array, Wk bFor the joint pre-coding matrix of user's k data vectors, Wk iFor the joint pre-coding matrix of user's i data vectors,For
User k/The joint pre-coding matrix of data vector, N0For white Gaussian noise.It is that candidate pattern concentrates other base station i to user
The channel matrix of k,It is the base station j to the channel matrix of user k, k in base station group in non-candidate style set/It is in cooperation set
Other users.C is entire base station cluster.
The advantage of the invention is that：Overcome in the prior art static cooperation mode be not suitable for user location variation and dynamic
The bigger defect of state cooperation mode system complexity, using half dynamic cooperative mode.Skill of the half dynamic cooperative mode in system
Art is realized compromises between complexity and the flexibility of cooperation, and the change in location that can be directed to user realizes cutting for cooperation set
It changes, while solving the problems, such as real-time update in the selection of dynamic cooperative set, realize and reduce system complexity while improving side
Edge user throughput and system average throughput.
Description of the drawings
Fig. 1 is inter-cell interference model.
Fig. 2 is the A3 times to report ideograph.
Fig. 3 is 19 subzone network structural topology figures in the embodiment of the present invention.
Fig. 4 is the flow chart of selection method of the present invention.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A kind of selection method for LTE-A COMP cooperation set of the present invention, the specific embodiment by taking 19 cells as an example
As follows, subzone network structural topology figure is as shown in Figure 3.As shown in figure 4, the present invention includes the following steps：
1) according to path loss, the adjacent area of serving cell and serving cell where user is divided into candidate cooperation style set.It waits
Choosing cooperation style set is static cooperation set, and triggering and startup are initiated by network side.Every three elements are divided into one group, and three
A element is respectively serving cell and two adjacent areas.
By taking a user UE1 in cell 2 as an example, according to path loss, the adjacent area static state of serving cell 2 is divided by network side
Several candidate cooperation patterns such as { 1,2,3 }, { 1,2,6 }, { 2,7,9 }, { 2,6,7 }, { 2,3,7 }, { 2,9,10 } and { 2,3,10 }
Collection, wherein the cell cooperative in whole websites is contained, the cell cooperative between cell cooperative and website in the website of part, for
The adjacent area cooperation style set of different users, static distribution are not exactly the same.
2) judge whether user UE1 meets each adjacent area of serving cell into the item of 36.331 agreement A3 events successively
Part, the adjacent area is included in neighboring cell list if meeting, and ignores if being unsatisfactory for.Enter item into 36.331 agreement A3 events
Part is that the measurement result Mn of the reception power RSRP of adjacent area reference signal subtracts the result of the lag parameter Hys of the event more than clothes
The RSRP measurement results Ms for cell of being engaged in adds the offset parameter Off, i.e. Mn-Hys of the event>Ms+Off, A3 event leave item
Part is the RSRP measurement result Mn of adjacent area, in addition the RSRP that the result after the lag parameter Hys of the event is more than serving cell is surveyed
Measure offset parameter Off, i.e. Mn+Hys that result Ms adds the event<Ms+Off.
Judge whether user UE1 is edge customer, if be suitble to participate in multipoint cooperative.When the neighboring cell list reported is sky
When, user-center user, has had preferable performance, has needed not participate in multipoint cooperative at this time；When the adjacent area row reported
When table non-empty, which is edge customer, and the selection of cooperation cell can be carried out to user.
3) it determines the non-cooperating element in the neighboring cell list, and non-cooperating element in the candidate style set that cooperates is deleted
Optimize collaboration set except being formed.When user UE1 is confirmed as edge customer, Φ is the set of cells that edge customer reports.This
Assuming that Φ includes { 1,3,6,7,9,10 }, the bigger cell of the traffic load of current X2 mouths, such as 3,6 are deleted；In deletion
The signal time delay of transfer point is more than length of the cycle CP, such as 10 in the cell of report.Then non-cooperating element includes 3,6,10.It is candidate adjacent
The range shorter of cell Φ is { 1,7,9 }.
Determine non-cooperating element be 3,6,10, therefore candidate cooperation style set { 1,2,3 }, { 1,2,6 }, { 2,3,7 },
Element 3,6,10 is deleted in { 2,6,7 }, { 2,9,10 }, forms optimization collaboration set { 1,2 }, { 2,7 }, { 2,9 }, { 2,7,9 }.
4) signal-to-noise ratio of each pattern in optimization collaboration set is calculated separatelyValue, and select that there is maximum signal to noise ratio
Style set as optimal collaboration set.
Signal-to-noise ratioThe calculation formula of value is：
Wherein：K is user, k/It is the other users in cooperation set, CkTo optimize collaboration set,For candidate's cooperation pattern
Centralized base-station b is to the channel matrix of user k, Wk bFor the joint pre-coding matrix of user's k data vectors, Wk iIt is sweared for user's i data
The joint pre-coding matrix of amount,For user k/The joint pre-coding matrix of data vector, N0For white Gaussian noise.It is candidate
The channel matrix of other base station i to user k in style set,It is the base station j to user k in base station group in non-candidate style set
Channel matrix, C be entire base station cluster.
Calculate separately optimization collaboration set { 1,2 }, { 2,7 }, { 2,9 }, { 2,7,9 } signal-to-noise ratioValue.Because waiting
Element 3,6,10 is deleted in choosing cooperation style set { 1,2,3 }, { 1,2,6 }, { 2,3,7 }, { 2,6,7 }, { 2,9,10 }, forms optimization
Collaboration set { 1,2 }, { 2,7 }, { 2,9 }, therefore calculate { 1,2 }, { 2,7 }, { 2,9 } two elements{ 2,7,9 } three
A elementAnd { 2,7 }, { 2,9 } they are the subsets for gathering { 2,7,9 }, collaborative effect is worse than { 2,7,9 }, this example selection
Only calculate { 2,7,9 } three elementsIn conclusion this example calculates style set { 2,7,9 } and { 1,2 }It is computed { 1,2 }Better than { 2,7,9 }The cooperation style set of this example selection
For { 1,2 }, therefore the cooperation cell of cell 2 is cell 1.
5) it when the pattern in optimal collaboration set is less than 1, abandons cooperating, when the pattern in optimal collaboration set is more than or equal to 1
When, cooperation selection is completed.This example completes cooperation, abandons cooperating when meeting special circumstances.Situation is as follows：It is deleted due to third step
When non-cooperating element leads to four-step calculation cooperation set, Φ numbers are less than 1, or the cell reported does not have third step is static to draw
Divide any one of set cell, then the user abandons multipoint cooperative.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (6)
1. a kind of selection method for LTE-A COMP cooperation set, it is characterised in that：Include the following steps：
1) according to path loss, the adjacent area of serving cell and serving cell where user is divided into candidate cooperation style set；
2) the reporting of user neighboring cell list, and judge whether the user is edge customer according to neighboring cell list：When what is reported
When neighboring cell list is empty, user-center user, has had preferable performance, has needed not participate in multipoint cooperative at this time；When
When the neighboring cell list non-empty reported, which is edge customer, and the selection of cooperation cell is carried out to user；If the user is non-
Edge customer is abandoned cooperating, if the user is edge customer, goes to step 3)；
3) it determines the non-cooperating element in the neighboring cell list, and non-cooperating element in the candidate style set that cooperates is deleted into shape
At optimization collaboration set；The non-cooperating element include in neighboring cell list X2 interface transmit extra-heavy element or and transfer point
Signal time delay is more than the element of length of the cycle CP；
4) signal-to-noise ratio of each pattern in optimization collaboration set is calculated separately, and selects the style set with maximum signal to noise ratio as optimal
Collaboration set；
5) it when the pattern in optimal collaboration set is less than 1, abandons cooperating, when the pattern in optimal collaboration set is more than or equal to 1, association
Elect completion.
2. a kind of selection method for LTE-A COMP cooperation set according to claim 1, it is characterised in that：It is described
Reporting of user neighboring cell list described in step 2) the specific steps are：Judge whether user meets each neighbour of serving cell successively
Area enters the condition of 36.331 agreement A3 events, and the adjacent area is included in neighboring cell list if meeting, and ignores if being unsatisfactory for.
3. a kind of selection method for LTE-A COMP cooperation set according to claim 1, it is characterised in that：It is described
Candidate cooperation style set is static cooperation set in step 1), and triggering and startup are initiated by network side.
4. a kind of selection method for LTE-A COMP cooperation set according to claim 1, it is characterised in that：It is described
Signal-to-noise ratio in step 4)Calculation formula be：
Wherein：K is user, CkTo optimize collaboration set,For candidate cooperation pattern centralized base-station b to the channel matrix of user k, Wk b
For the joint pre-coding matrix of user's k data vectors, Wk iFor the joint pre-coding matrix of user's i data vectors,For user k/
The joint pre-coding matrix of data vector, N0For white Gaussian noise,It is other base station i to user k in candidate cooperation style set
Channel matrix,It is the base station j to the channel matrix of user k, k in base station group in non-candidate cooperation style set/It is collaboration set
Other users in conjunction, C are entire base station cluster.
5. a kind of selection method for LTE-A COMP cooperation set according to claim 2, it is characterised in that：It is described
Condition into 36.331 agreement A3 events is that the measurement result Mn of the reception power RSRP of adjacent area reference signal subtracts the event
Lag parameter Hys result be more than serving cell RSRP measurement results Ms add the event offset parameter Off, i.e. Mn-
Hys ＞ Ms+Off；The A3 events leave the RSRP measurement result Mn that condition is adjacent area, in addition the lag parameter of the event
Result after Hys is more than offset parameter Off, i.e. Mn+Hys ＜ Ms+ of the RSRP measurement results Ms plus the event of serving cell
Off。
6. a kind of selection method for LTE-A COMP cooperation set according to claim 3, it is characterised in that：It is described
Pattern in candidate's cooperation style set is three one group of elements.
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| CN106604311B (en) * | 2015-10-13 | 2020-11-17 | 华为技术有限公司 | Method and device for selecting transmission node participating in coordinated multi-point transmission |
| CN105376744B (en) * | 2015-10-21 | 2019-01-18 | 中国南方电网有限责任公司超高压输电公司 | Cooperative base station cluster-dividing method and device in Wireless Heterogeneous Networks |
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| US20130021925A1 (en) * | 2011-07-22 | 2013-01-24 | Sharp Laboratories Of America, Inc. | Coordinated multipoint (comp) transmission method selection and feedback requirements |
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