CN102625356B - A kind of terminal based on CoMP accesses the method and system of multiple cell - Google Patents
A kind of terminal based on CoMP accesses the method and system of multiple cell Download PDFInfo
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- CN102625356B CN102625356B CN201110034387.9A CN201110034387A CN102625356B CN 102625356 B CN102625356 B CN 102625356B CN 201110034387 A CN201110034387 A CN 201110034387A CN 102625356 B CN102625356 B CN 102625356B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
The invention discloses a kind of method that terminal based on multipoint cooperative CoMP accesses multiple cell, including：The system message for carrying UE reporting measurement cell minimum thresholds is sent to UE by base station；UE is received after system message, determines itself corresponding serving cell and measurement set of cells according to the minimum threshold, and measurement set of cells is reported into base station；Base station carries out information exchange with the measurement cell that UE is reported, and selects cooperation cell, and the cooperation cell selected set is notified into UE；UE is notified and after being fed back, and adds CoMP.The present invention further simultaneously discloses the system that a kind of terminal based on multipoint cooperative CoMP accesses multiple cell, the problem of edge UE can not add CoMP when being initially accessed can be solved with this method and system, and then the handling capacity of cell edge when edge UE is initially accessed can be ensured.
Description
Technical field
The present invention relates to many in LTE evolution (Long Term Evolution Advanced, LTE-Advanced)
Point cooperation (Coordinated multi-point, CoMP) technology, more particularly to a kind of terminal access multiple cell based on CoMP
Method and system.
Background technology
LTE-Advanced is as the candidate technologies scheme of forth generation mobile communication technology (4G), and its performance indications is in LTE
On the basis of further enhance, system supports maximum 100MHz bandwidth, and the downlink peak rates of support are 1Gbit/s, and frequency spectrum is imitated
Rate has brought up to 30bit/s/Hz；Upstream peak speed is 500Mbit/s, and spectrum efficiency has brought up to 15bit/s/Hz.LTE-
Advance above-mentioned performance proposes high requirement, therefore, LTE- on cell throughout, especially cell edge throughput
Advanced proposes that CoMP method improves cell edge coverage rate to reach, improves the purpose of cell transmission speed.
The CoMP includes descending CoMP and sent and up CoMP receptions.Wherein, up CoMP, which is received, passes through multiple cells
Cell edge user throughput is improved to the joint reception of user data；Descending CoMP launches foundation
It is no to obtain business datum, Combined Treatment (JointProcessing, JP) and cooperative scheduling/wave beam forming can be divided into
(Coordinated Scheduling/Beamforming, CS/CB).Up CoMP receives the main mode using Combined Treatment
Transmission gain is obtained, up CoMP is received then reduces inter-cell interference by cooperating.
Cell definitions are serving cell, cooperation cell set and measurement cell set by third generation partner program (3GPP)
Close.Serving cell is for transmitting physical downlink channel control (PDCCH) single subdistrict；Cooperation cell set is one group direct
Or the set of cells of Physical Downlink Shared Channel (PDSCH) is sent to UE indirectly, this set can be transparent to UE, also can be to UE
It is opaque；The set of cells of measurement set of cells to be one group the report channel condition information being connected with UE.
At present, UE cooperation cell set and the determination of measurement set of cells, are all initially accessed in UE and carry out afterwards,
It so can bring about a problem：The edge of cell is in if when UE is initially accessed, as shown in Figure 1, then, the UE is then
CoMP can only could be added after being initially accessed, and cell edge throughput is improved by CoMP technologies, causes UE initially to connect
The edge throughput of fashionable cell turns into bottleneck.
The content of the invention
In view of this, it is a primary object of the present invention to provide it is a kind of based on CoMP terminal access multiple cell method and
System, it is possible to resolve the problem of edge UE can not add CoMP when being initially accessed, and then can ensure small when edge UE is initially accessed
The handling capacity of area edge.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
The invention discloses a kind of method that terminal based on multipoint cooperative CoMP accesses multiple cell, this method includes：
The system message for carrying UE reporting measurement cell minimum thresholds is sent to UE by base station；UE is received after system message,
Itself corresponding serving cell and measurement set of cells are determined according to the minimum threshold, and measurement set of cells is reported into base
Stand；
The measurement cell that base station and UE are reported carries out information exchange, selects cooperation cell, and by the cooperation cell collection selected
Close and notify UE；UE is notified and after being fed back, and adds CoMP.
Wherein, the threshold de is：Reference Signal Received Power RSRP absolute value or with serving cell RSRP's
Difference value.
Wherein, the UE reporting measurements set of cells is：
UE sends radio resource control RRC connection request message to base station, measurement is carried in RRC connection request message small
The relevant information of area's set, including：The cell ID or cell ID+RSRP measured values or cell ID+ difference of each measurement cell
RSRP measured values, if what is carried is cell ID+ difference RSRP measured values, also need to carry this serving cell RSRP measured values.
Wherein, the base station selects cooperation cell and is：
Base station carries out information exchange with the measurement cell that UE is reported, and the light cell of current loads is selected, directly as cooperation
Cell；Or,
All measurement cells progress information exchange that base station is reported using the RSRP measured values that UE is reported as foundation with UE, is selected
Cooperation cell；Or,
The channel quality indicator (CQI) that base station is reported according to UE/pre-coding matrix instruction PMI/ order instruction RI values and RSRP are surveyed
Value carries out information exchange with all measurement cells that UE is reported, and selects cooperation cell.
Wherein, the cooperation cell selected set is notified that UE is by the base station：
Base station sets up message by RRC connections or RRC connections reconfiguration message notifies cooperation cell to UE.
In such scheme, the UE is received after system message, and this method also includes：
UE is in cell search process, and selection RSRP measured value highest cells, i.e. serving cell are resident, and are stored up to simultaneously
To the cell information of minimum threshold, including cell ID and corresponding RSRP measured values or RSRP difference values.
The invention also discloses the system that a kind of terminal based on multipoint cooperative CoMP accesses multiple cell, the system includes：
Base station and UE；Wherein,
The base station, for the system message for carrying UE reporting measurement cell minimum thresholds to be sent into UE, and receives UE
The measurement set of cells reported；The measurement cell that is reported with UE carries out information exchange, selects cooperation cell, and by the cooperation selected
Set of cells notifies UE, receives UE feedback；
The UE, for receiving after system message, itself corresponding serving cell and survey are determined according to the minimum threshold
Set of cells is measured, and measurement set of cells is reported into base station；Fed back after the cooperation cell set for receiving base station notice, and
Add CoMP.
Wherein, the UE is received after system message, is additionally operable in cell search process, selects RSRP measured value highests
Cell, i.e. serving cell are resident, while storage reaches the cell information of minimum threshold, including cell ID and corresponding RSRP measurements
Value or RSRP difference values.
The terminal based on CoMP that the present invention is provided accesses the method and system of multiple cell, and base station will carry UE reporting measurements
The system message of cell minimum threshold is sent to UE；UE is received after system message, and itself correspondence is determined according to the minimum threshold
Serving cell and measurement set of cells, and by measurement set of cells report base station；The measurement cell that base station is reported with UE is entered
Row information is interacted, and selects cooperation cell, and the cooperation cell selected set is notified into UE；UE is notified and after being fed back,
Add CoMP.In the present invention, UE, that is, edge UE when being initially accessed at the latest after RRC connection reconfiguration messages, it is and most fast
CoMP is may participate in after message is set up in RRC connections, the gain that CoMP is brought on cell edge throughput, therefore this hair is obtained
It is bright to solve the problem of edge UE add CoMP when being initially accessed, it is ensured that cell edge when edge UE is initially accessed
Handling capacity.
Brief description of the drawings
Structural representation in cell edge when Fig. 1 is initially accessed for UE；
Fig. 2 accesses the method implementation process schematic diagram of multiple cell for terminal of the present invention based on CoMP；
Fig. 3 is all cell structure schematic diagrames that UE is searched in cell search process；
Fig. 4 is the MAC Control Element of mode one in embodiment one structure chart；
Fig. 5 is the MAC PDU subheaders portion structure chart of mode two in embodiment one；
Fig. 6 is the MAC Control Element of mode two in embodiment one structure chart；
Fig. 7 is the MAC Control Element of mode three in embodiment one structure chart.
Embodiment
The present invention basic thought be：The system message for carrying UE reporting measurement cell minimum thresholds is sent to by base station
UE；UE is received after system message, and itself corresponding serving cell and measurement set of cells are determined according to the minimum threshold, and will
Measurement set of cells reports base station；Base station carries out information exchange with the measurement cell that UE is reported, and selects cooperation cell set, and
Cooperation cell set is notified into UE；UE is notified and after being fed back, and adds CoMP.
Wherein, heretofore described UE is edge UE.
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the present invention.
Fig. 2 accesses the method implementation process schematic diagram of multiple cell for terminal of the present invention based on CoMP, as shown in Fig. 2 should
Flow realizes that step is as follows：
Step 201：The system message for carrying UE reporting measurement cell minimum thresholds is sent to UE by base station；
Specially：Base station sends to UE and UE is carried in system message, system message to the minimum of base station reporting measurement cell
Thresholding.Here, the definition mode on threshold value has two kinds：The first, Reference Signal Received Power is defined as by threshold value
(RSRP) absolute value；Second, threshold value is defined as the difference value with serving cell RSRP.
In the prior art, in UE initial access process, base station can not obtain the measurement set of cells that UE is reported, and measure
Set of cells is determined by base station；In the present invention, in UE initial access process, change and cell set is measured by UE active reportings
Close, the measurement cell reported need to meet minimum threshold, the system message that this minimum threshold is sent by base station is carried.
Step 202：UE is received after system message, and itself corresponding serving cell and measurement are determined according to the minimum threshold
Set of cells；
Specially：Receive after system message, UE selects RSRP highest cells, that is, serviced small in cell search process
Area is resident, while storage reaches the cell information of minimum threshold, including cell ID and the RSRP measured values or RSRP difference of measurement
Value.
If Fig. 3 is all cell structure schematic diagrames that UE is searched in cell search process, serving cell and measurement are small
Area can be determined as follows：
Method one：UE searches totally nine cells of cell 1- cells 9, by its RSRP measured value in cell search process
Descending arrangement, is followed successively by RSRP1＞ RSRP5＞ RSRP6＞ RSRP3＞ RSRP4＞ RSRP9＞ RSRP2＞ RSRP7＞
RSRP8If minimum threshold is taken as absolute thresholding RSRPmin, and if RSRP1＞ RSRP5＞ RSRP6＞ RSRP3＞ RSRP4＞
RSRP9＞ RSRPmin＞ RSRP2＞ RSRP7＞ RSRP8, then cell 1 then be serving cell, cell 5,6,3,4,9 for measurement
Cell.
Method two：UE searches totally nine cells of cell 1- cells 9, by its RSRP measured value in cell search process
Descending arrangement, is followed successively by RSRP1＞ RSRP5＞ RSRP6＞ RSRP3＞ RSRP4＞ RSRP9＞ RSRP2＞ RSRP7＞
RSRP8If minimum threshold is taken as difference thresholding RSRPmin, and if (RSRP1-RSRP5) ＜ (RSRP1-RSRP6) ＜ (RSRP1-
RSRP3) ＜ (RSRP1-RSRP4) ＜ (RSRP1-RSRP9) ＜ RSRPmin, then cell 1 is serving cell, cell 5,6,3,4,9
It is then measurement cell.
Here, the span of minimum threshold can be limited to 4-8, can be configured by backstage, base station is notified to UE's
It is enumerated value, UE can be mapped to corresponding dbm values according to enumerated value.
In the prior art, when UE have selected RSRP measured value highests cell it is resident after, can abandon it is other search it is small
Area's relevant information, and after UE of the present invention sorts to the cell RSRP measured values searched, select RSRP measured value highest cells
It is resident, and the cell ID for reaching minimum threshold and correspondence RSRP measured values or difference RSRP measured values are stored, then abandon other
The relevant information of the cell searched.
Step 203：UE reports base station by set of cells is measured；
Specially：UE sends wireless heterogeneous networks (RRC) connection request message to base station, in RRC connection request message
The relevant information of measurement set of cells is carried, including：The cell ID or cell ID+RSRP measured values or small of each measurement cell
Area ID+ difference RSRP measured values, if what is carried is cell ID+ difference RSRP measured values, also need to carry this serving cell RSRP
Measured value.
Certainly, if UE is in cell search process, the cell for reaching minimum threshold is not searched for, UE is sending RRC
During connection request message, then it is not required to carry measurement cell-related information.
The measurement set of cells that UE is reported carries inner in MAC control information unit (MAC ControlElement), can make
Measurement set of cells is carried with reserved Logic Channel Identifier (LCID), base station parses Medium Access Control (MAC) Protocol Data Unit (PDU)
Behind head, metrical information is directly reported into RRC.
Step 204：The measurement cell that base station and UE are reported carries out information exchange, selects cooperation cell, and by cooperation cell
Set notifies UE；
Specially：If UE is competed successfully, base station will enter row information with the measurement cell carried in RRC connection request message
Interaction, selects cooperation cell, and sets up message by RRC connections or RRC connections reconfiguration message notifies cooperation cell to UE.
Here, it is described to select cooperation cell, and notify UE mode to have following three kinds result：
Mode one：Base station carries out information exchange with the measurement cell that UE is reported, and selects the light cell of current loads, directly makees
For cooperation cell, set up in RRC connections and UE is brought in message.
Mode two：Base station is entered row information as foundation and all measurement cells that UE is reported using the RSRP measured values that UE is reported and handed over
Mutually, cooperation cell is selected, setting up message by RRC connections is sent to UE.
Mode three：The channel quality instruction (Channel Quality Indicator, CQI) that base station is reported according to UE/pre-
Encoder matrix indicate (Precoding Matrix Indicator, PMI)/order instruction (Rank Indication, RI) value and
RSRP measured values carry out information exchange with all measurement cells that UE is reported, and cooperation cell are selected, in RRC connection reconfiguration messages
In bring UE；
Wherein, base station issues CQI/PMI/RI configurations, set up in RRC connections when setting up message to UE transmission RRC connections
The DCI 0 that is issued after message is inner to put 1 by CQI request, and triggering UE reports aperiodic CQI/PMI/RI, and now UE is not only
The CQI/PMI/RI of serving cell is reported, the CQI/PMI/RI of reporting measurement cell is also wanted, base station is obtaining what UE was reported
After CQI/PMI/RI information, enter row information according to CQI/PMI/RI and RSRP measured values and the UE all measurement cells reported and hand over
Mutually, cooperation cell is selected, UE is brought in RRC connection reconfiguration messages.
In above-mentioned three kinds of modes, how base station specifically selects cooperation cell not after information exchange is carried out with measurement cell
Within the scope of the present invention.
Step 205：UE is notified and after being fed back, and adds CoMP；
Specially：UE is received after the notice of base station, sends the ACK feedbacks that message is set up to RRC connections, base station receives ACK
After feedback, make UE be directly entered CoMP cell collection, obtain the gain that CoMP is brought.
The present invention is described in further detail with reference to specific embodiment.
Embodiment one
The specific different modes for introducing three kinds of UE reporting measurement set of cells in the present embodiment.
Mode one：UE only carries the cell of measurement cell in the MAC Control Element of RRC connection request message
ID, MAC Control Element structure are as shown in Figure 4.Wherein, LCG ID are taken as the value retained at present in agreement, Cell
ID represents cell ID, can be represented with 14bit, if multiple cell ID, then needs with multiple MAC Control Element tables
Show.
Mode two：UE carries the cell ID of measurement cell in the MAC Control Element of RRC connection request message
And absolute RSRP measured values, MAC PDU head constructions are as shown in figure 5, MACControl Element structure such as Fig. 6 institutes
Show.Wherein, LCID values are the value retained at present in agreement in subheader portion, and L length can be 7bit, i.e. MAC Control
It is 128bytes that Element is most long；MACControl Element are made up of Cell ID and RSRP measured value two parts,
Cell ID can take 9bit, and RSRP measured values can take 7bit.
Mode three：UE carries the cell ID of measurement cell in the MAC Control Element of RRC connection request message
And difference RSRP measured values, MAC PDU subheaders portions are identical with mode two, MACControl Element structure such as Fig. 7 institutes
Show.Wherein, MAC Control Element are by serving cell RSRP measured values, measurement cell Cell ID and difference RSRP values three
Part is constituted, and serving cell RSRP measured values can be represented with 8bit, and measurement cell Cell ID can be represented with 9bit, RSRP difference
Value can represent that remaining 4bit can be then reserved bit with 3bit.
Embodiment two
Cooperation cell is selected in the specific base station introduced described in step 204 in the present embodiment, and by the cooperation cell selected
Notify three kinds of methods to UE.
Method one：The measurement cell ID that UE is reported by RRC connection request message is checked in base station, it is not necessary to RSRP measured values
For the selection of cooperation cell, simply and all measurement cells for reporting of UE carry out interacting message, check which measures cell and had
Ability carries out CoMP, just elects cooperation cell as, setting up message by RRC connections notifies the cooperation cell selected to UE.In RRC
Connection, which is set up in message, is not required to notify specific cell ID, but notifying cell ID indexes, and correspondingly RRC connection request disappears index 0
First cell ID in MACControl Element, the second cell ID of correspondence of index 1 are ceased, the like.
Method two：The RSRP measured values that base station carries UE by RRC connection request message are used to assist as metrical information
Make the selection of cell, message is set up by the cooperation cell selected notice UE by RRC connections.Equally, message is set up in RRC connections
In be not required to notify specific cell ID, but notifying cell ID indexes index 0 corresponding RRC connection request message MAC Control
First cell ID in Element, the second cell ID of correspondence of index 1, the like.
Method three：CQI/PMI/RI the and RSRP measured values that base station reports UE are small for cooperating as metrical information in the lump
The selection in area.Carrying CQI configuration informations in message are set up in RRC connections, and including aperiodic configuration and period assignment, base station exists
Send RRC connections and set up in the DCI0 that first is issued UE after message and CQI request are put 1, triggering UE progress is aperiodic
CQI is reported, and at this moment UE needs to report the CQI/PMI/RI of this serving cell, it is also desirable to the CQI/PMI/RI of reporting measurement cell.
When base station receive the serving cell that UE is reported CQI/PMI/RI and measurement cell CQI/PMI/RI after, and UE it
Before the RSRP measured values that report together, the decision-making for cooperation cell.Equally, now it is not required to notify specific cell ID, but
First cell ID in notifying cell ID indexes, 0 corresponding RRC connection request message MAC Control Element of index, rope
Draw 1 second cell ID of correspondence, the like.
To realize the above method, present invention also offers the system that a kind of terminal based on CoMP accesses multiple cell, including：
Base station and UE；Wherein,
The base station, for the system message for carrying UE reporting measurement cell minimum thresholds to be sent into UE, and receives UE
The measurement set of cells reported；The measurement cell that is reported with UE carries out information exchange, selects cooperation cell, and by the cooperation selected
Set of cells notifies UE, receives UE feedback；
The UE, for receiving after system message, itself corresponding serving cell and survey are determined according to the minimum threshold
Set of cells is measured, and measurement set of cells is reported into base station；Fed back after the cooperation cell set for receiving base station notice, and
Add CoMP.
The UE is received after system message, is additionally operable in cell search process, selects RSRP measured value highest cells,
I.e. serving cell is resident, while storage reaches the cell information of minimum threshold, including cell ID and corresponding RSRP measured values or
RSRP difference values.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (8)
1. a kind of method that terminal based on multipoint cooperative CoMP accesses multiple cell, it is characterised in that this method includes：
The system message for carrying UE reporting measurement cell minimum thresholds is sent to UE by base station；UE is received after system message, according to
The minimum threshold determines itself corresponding serving cell and measurement set of cells, and measurement set of cells is reported into base station；
Base station carries out information exchange with the measurement cell that UE is reported, and selects cooperation cell, and the cooperation cell selected is gathered into logical
Know UE；UE is notified and after being fed back, and adds CoMP；
The UE is edge UE.
2. the method that the terminal according to claim 1 based on CoMP accesses multiple cell, it is characterised in that the thresholding is determined
Justice is：Reference Signal Received Power RSRP absolute value or the difference value with serving cell RSRP.
3. the method that the terminal according to claim 1 or 2 based on CoMP accesses multiple cell, it is characterised in that the UE
Reporting measurement set of cells is：
UE sends radio resource control RRC connection request message to base station, and measurement cell set is carried in RRC connection request message
The relevant information of conjunction, including：The cell ID or cell ID+RSRP measured values or cell ID+ difference RSRP of each measurement cell
Measured value, if what is carried is cell ID+ difference RSRP measured values, also needs to carry this serving cell RSRP measured values.
4. the method that the terminal according to claim 1 or 2 based on CoMP accesses multiple cell, it is characterised in that the base
Select cooperation cell in station：
Base station carries out information exchange with the measurement cell that UE is reported, and the light cell of current loads is selected, directly as cooperation cell；
Or,
All measurement cells progress information exchange that base station is reported using the RSRP measured values that UE is reported as foundation with UE, selects cooperation
Cell；Or,
The channel quality indicator (CQI) that base station is reported according to UE/pre-coding matrix instruction PMI/ order instruction RI values and RSRP measured values
Information exchange is carried out with all measurement cells that UE is reported, cooperation cell is selected.
5. the method that the terminal according to claim 1 or 2 based on CoMP accesses multiple cell, it is characterised in that the base
Stand and the cooperation cell selected set is notified that UE is：
Base station sets up message by RRC connections or RRC connections reconfiguration message notifies cooperation cell to UE.
6. the method that the terminal according to claim 1 or 2 based on CoMP accesses multiple cell, it is characterised in that the UE
Receive after system message, this method also includes：
UE is in cell search process, and selection RSRP measured value highest cells, i.e. serving cell are resident, while storage reaches most
The cell information of low threshold, including cell ID and corresponding RSRP measured values or RSRP difference values.
7. the system that a kind of terminal based on multipoint cooperative CoMP accesses multiple cell, it is characterised in that the system includes：Base station and
UE；Wherein,
The base station, is reported for the system message for carrying UE reporting measurement cell minimum thresholds to be sent into UE, and receives UE
Measurement set of cells；The measurement cell that is reported with UE carries out information exchange, selects cooperation cell, and by the cooperation cell selected
Set notifies UE, receives UE feedback；
The UE, for receiving after system message, determines itself corresponding serving cell according to the minimum threshold and measures small
Area gathers, and measurement set of cells is reported into base station；Fed back, and added after the cooperation cell set for receiving base station notice
CoMP；
The UE is edge UE.
8. the system that the terminal according to claim 7 based on CoMP accesses multiple cell, it is characterised in that the UE is received
After system message, it is additionally operable in cell search process, selection RSRP measured value highest cells, i.e. serving cell are resident, together
When storage reach the cell information of minimum threshold, including cell ID and corresponding RSRP measured values or RSRP difference values.
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| CN201110034387.9A CN102625356B (en) | 2011-02-01 | 2011-02-01 | A kind of terminal based on CoMP accesses the method and system of multiple cell |
| PCT/CN2011/084516 WO2012103772A1 (en) | 2011-02-01 | 2011-12-23 | Comp-based method and system for ue to access multiple cells |
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| CN108111199A (en) | 2017-05-05 | 2018-06-01 | 中兴通讯股份有限公司 | Feedback, method of reseptance and device, equipment, the storage medium of channel state information |
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| CN108141267B (en) * | 2015-09-24 | 2021-04-27 | Lg 电子株式会社 | Method for transmitting and receiving channel state information in wireless communication system and apparatus therefor |
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| Publication number | Publication date |
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| WO2012103772A1 (en) | 2012-08-09 |
| CN102625356A (en) | 2012-08-01 |
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