CN103959671B - Method and apparatus for transmitting and receiving signal in distributed antenna system - Google Patents
Method and apparatus for transmitting and receiving signal in distributed antenna system Download PDFInfo
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- CN103959671B CN103959671B CN201280058009.7A CN201280058009A CN103959671B CN 103959671 B CN103959671 B CN 103959671B CN 201280058009 A CN201280058009 A CN 201280058009A CN 103959671 B CN103959671 B CN 103959671B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
Abstract
An apparatus and method for transmitting and receiving a signal in a Distributed Antenna System (DAS) is provided. A method for determining an initial state in a DAS includes receiving a value through high-level signalling and determining an initial state based on the value, in which the value includes a value in which is set an initial state of a scrambling sequence, which differs according to a transmission point.
Description
Technical field
This invention relates generally to mobile radio system, and more particularly, to in spaced antenna system
The device and method sent and received signal in system (DAS).
Background technology
Generally, by multiple cells are set up in finite region building cellular radio mobile communication system.Each is little
Base station (BS) part for being responsible for mobile communication in area is located at the center of cell.BS parts could be for the day for sending wireless signal
Line or signal processing, and the heart provides Mobile Communication Service to the user equipment (UE) in cell in the cell.Thus,
Feel at ease in the cell and fill the system referred to as centralized antenna system (CAS) of antenna, and common mobile communication system is so
System example.
Also there are the distributing antenna systems (DAS) different from CAS.
The content of the invention
Technical problem
However, compared with CAS, traditional DAS is required to by antenna is made on the service coverage area of cell equably
The scheme for being distributed to provide the Mobile Communication Service of improvement.
Technical scheme
Therefore, the invention provides a kind of be disposed on the service coverage area of each BS in a distributed fashion in antenna
Determine in DAS for generate demodulated reference signal (DMRS) scramble sequence original state for efficient communication method.
According to an aspect of the present invention, there is provided a kind of method for determining original state in DAS, methods described include：
By high-level signaling reception value；And original state is determined based on the value, the value indicates the initial shape for being configured to scramble sequence
The value of state, which is different according to transfer point.
According to a further aspect of the invention, there is provided a kind of device for determining original state in DAS, the device include：
Receptor, for by high-level signaling reception value；And controller, for determining original state based on the value, the value include by
Other values of the original state of scramble sequence are configured with, which is different according to transfer point.
According to a further aspect of the invention, there is provided a kind of method for determining original state in DAS, the method include：
Receive scrambled code mark (SCID)；And be to leave initial shape come original state determined by judging based on received SCID
State or new original state.
According to a further aspect of the invention, there is provided a kind of device for determining original state in DAS, the device include：
Receptor, for receiving SCID；And controller, judge for based on received SCID determined by original state be
Leave original state or new original state.
Description of the drawings
From the detailed description for carrying out below in conjunction with the accompanying drawings, above and other feature and advantage of various embodiments of the present invention will
It is clearer, in the accompanying drawings：
Fig. 1 illustrates the multiple cells in legacy system；
Fig. 2 illustrates the downlink resource blocks (RB) of senior long term evolution (LTE-A) system；
Fig. 3 is illustrated
The resource element (RE) of mouth CSI-RS and 8 port CSI-RS；
Fig. 4 illustrates the multiple transmission point in DAS；
Fig. 5 is illustrated and according to an embodiment of the invention is sent down via physical downlink control channel (PDCCH)
Downlink control information (DCI)；
Fig. 6 illustrates the operation of BS according to an embodiment of the invention；
Fig. 7 illustrates the operation of UE according to an embodiment of the invention；And
Fig. 8 illustrates the pass between enhanced PDCCH (E-PDCCH) and physical down link sharing channel (PDSCH)
System.
Specific embodiment
Hereinafter, embodiments of the invention be will be described in detail with reference to the accompanying drawings.Need not if known function and structure is possible
Strategic point obscures subject of the present invention, then they will not be described.The term being used herein is based on the work(in the present invention
Can and define, and can according to user, the intention of operator or implement and change.Therefore, the definition of the term should
When based on through description content and make.
The detailed description of various embodiments of the present invention will be based primarily upon based on Orthodoxy Frequency Division Multiplex (OFDM)
Enhanced general land wireless access (EUTRA) standard of wireless communication system, particularly third generation partner program (3GPP)
And make, but it will be recognized by those of ordinary skill in the art that subject of the present invention can be applicable to similar technical background and
Other communication systems of channel form, without greatly departing from the scope of the present invention.
The invention discloses a kind of antenna of each the BS operation wherein in the mobile communication system that there are multiple BS
It is distributed on efficiently logical during interferometry is performed in the DAS on the service coverage area of BS, in UE for downlink
The method of letter.
From the early stage of the communication service provided towards voice, mobile communication system is had developed into now for providing
The wireless packet data communication system of the high-speed high-quality amount of data and multimedia service.Recently, various mobile communication standards are (such as
The high-speed downlink packet of 3GPP accesses (HSDPA), High Speed Uplink Packet and accesses (HSUPA), LTE, LTE-A, 3GPP2
HRPD (HRPD) and IEEE (IEEE) 802.16) to have developed into support at a high speed high
The wireless block data transmission service of quality.Specifically, it is developed for effectively supporting high-speed radio packet data transmission
LTE system maximize wireless system capacity by using various wireless connect technologies.Compared with LTE system, from LTE systems
The lte-a system that system is developed has improve data transmission capacity.
LTE refers to BS the and UE part corresponding with the system version 8 or 9 of 3GPP normal structures, and LTE-A refer to
The corresponding BS and UE parts of the system version 10 of 3GPP normal structures.3GPP normal structures are by lte-a system standardization
And now based on standardization lte-a system developing with the standardization for carrying high performance subsequent system version.
Existing 3rd generation and the 4th generation wireless packet data communication system (such as HSDPA, HSUPA, HRPD, LTE/LTE-
A) using the scheduling scheme of adaptive modulation and coding (AMC) scheme and channel sensitive improving efficiency of transmission.When utilizing AMC
During scheme, transmitter can adjust the amount of data to be sent according to channel status.I.e., when channel conditions are poor, transmitter
The amount for reducing data to be sent matches aspiration level will receive error probability.When channel status is good, transmitter increases
The amount of data to be sent matches aspiration level and efficiently sends many information will receive error probability.When using letter
During the sensitive scheduling resource Managed Solution in road because transmitter have among optionally providing services to multiple users it is fabulous
Channel status user, so compared with transmitter provides service after by channel distribution to user, increased system appearance
Amount.This capacity increases commonly known as multi-user diversity gain.AMC schemes and channel sensitive scheduling scheme are for most efficient
Time receive impaction of partial channel state information just from receptor feedback, and using appropriate modulation and coding techniques.
When being used together with multiple-input and multiple-output (MIMO) transmission plan, AMC schemes can determine the quantity of space layer
Or the grade (rank) of transmission signal.AMC schemes also determine that best data rate and using MIMO and code rate and
Modulation scheme come consider for transmission layer quantity.
Carrying out using the OFDMA of next generation mobile communication system substituting as in the second filial generation and 3G (Third Generation) Moblie system
The CDMA's of the multiple access scheme used in system is widely studied.3GPP and 3GPP2 are had begun to the evolution system based on OFDMA
Standardization effort.Estimated compared with CDMA, OFDMA will increase capacity, this is because frequency domain tune can be performed on the frequency axis
Degree.Although the dispatching method of channel sensitive can be utilized to obtain capacity gain from the time dependent characteristic of channel, can be
Bigger capacity gain is obtained using the characteristic of channel changed with frequency.
Generally, set up the mobile communications network being made up of multiple cells to hold with the system for extending in mobile communication system
Amount.The size of each cell is determined according to the through-put power of cell.
Fig. 1 illustrates the multiple cells arranged in conventional systems.
In FIG, perform the transfer point 100 for sending to be formed with large-area cell using high transmit power, and utilize
Low transmit power performs the transfer point 110,120,130 and 140 for sending and formed in the cell area of transfer point 100 has facet
Long-pending cell.In FIG, transfer point 100,110,120,130 and 140 by using the individual antenna in their position or
Multiple antennas sending and receiving wireless signal, so as to provide Mobile Communication Service to the UE in each of which cell.Using height
The transfer point 150 that transmit power execution sends is formed with large-area another cell, and is sent out using the execution of low transmit power
The transfer point 160,170,180 and 190 sent forms the cell with small area in the cell area of transfer point 150.By transmitting
10 cells that point 100,110,120,130,140,150,160,170,180 and 190 is formed respectively have unique cell ID.
Cell ID is allocated to each cell to allow UE to recognize the value of the cell, and in LTE/LTE-A systems supports 500
Or more cells ID.
In FIG, can differently be sent using respective cell ID by the signal that each cell sends.Specifically,
For for UE perform in lte-a system channel estimation downlink PDSCH demodulated reference signal (DMRS), according to
Differently application is employed the randomized scramble sequence for signal to cell ID.DMRS for PDSCH (or PDSCH
DMRS it is) to enable the reference signal of the channel estimation that channel reconstructing is performed for PDSCH from eNB to UE transmissions.
In lte-a system, using OFDMA scheme transmission signals.For the bandwidth quilt of the signal transmission in lte-a system
Multiple Resource Block (RB) are divided into, and UE can receive service signal by one or more RB.Fig. 2 illustrates LTE-A systems
The downlink RB of system.One RB is made up of 12 subcarriers in a frequency domain, and on a timeline by 14 OFDM symbol structures
Into.Frequency and time resource in the minimum unit that data can be carried in a RB is referred to as resource element (RE), and
RB is made up of 168 (12 subcarrier × 14 OFDM symbols) individual RE.
The transmission in a RB performs the signal and the specific reference signal of cell (CRS), demodulation reference of difference in functionality
Signal (DMRS), physical down link sharing channel (PDSCH) and control channel, as shown in Figure 2.In addition, in the position of Fig. 2
Can be with transmitting channel state information reference signal (CSI-RS) in 200-219.One or more positions in the 200-219 of position
In can transmit CSI-RS, and do not transmit PDSCH in the position of transmission CSI-RS, but alternatively, can be in position
PDSCH is transmitted during the position of CSI-RS is not arranged among 200-219.
Fig. 3 diagrams wherein transmit 1 port channel state information reference signals (CSI-RS), 2 port CSI-RS, 4 ports
The resource element (RE) of CSI-RS and 8 port CSI-RS.It can be seen from figure 3 that 1 port CSI-RS and 2 port CSI-RS is passed with which
Defeated position is included in the sub- style properties in the transmission location of 4 port CSI-RS.4 port CSI-RS have its transmission location quilt
The sub- style properties being included in the transmission location of 8 port CSI-RS.For example, the transmission of a 4 port CSI-RS can be transmitted
Position 320 is included in the transmission location 330 that can transmit a 8 port CSI-RS.
When the multiple cells with different districts ID as illustrated in fig. 1 in the presence of, different scramblings are according to cell ID
It is applied to the PDSCH DMRS of Fig. 2.By using different scramblings, generating between the PDSCH DMRS sent from different districts
Interference by effectively randomization, so as to improve channel estimating performance.More specifically, using the initial shape be given by equation (1)
State is applied to the scramble sequence of each cell to generate, wherein：
Mathematical expression 1
Usually, according to generator polynomial generating scramble sequence, and its value is arranged according to when scramble sequence is generated
Original state and change.In equation (1),Represent cell ID and with the variable value according to cell ID.Therefore, have
The cell for having different districts ID has different original states, such that it is able to scramble PDSCH by different scramble sequences
DMRS。
When the DAS as advanced mobile communication system is set up, in the different districts in lte-a system as above
The function of performing scrambling is restricted in terms of the randomization of interference.This is because in DAS, transmitter similar with legacy system
It is disposed on the point of distribution with receptor to provide Mobile Communication Service, but does not possess unique little in each transmission point
Area ID, but, multiple transmission point shares cell ID.
Fig. 4 illustrates the multiple transmission point to form DAS.In the diagram, the transfer point of transmission is performed using high transmit power
400 and using low transmit power perform transmission transfer point 410,420,430 and 440 all share cell ID.Thus, with
Conventional mobile communications are compared as shown in Figure 1, for the DAS that one of cell ID is shared by multiple transmission point, can be with height
The distribution of the Radio Resource of the multiple transmission point of a UE is gone to effect.
For DAS as shown in Figure 4, multiple transmission point shares cell ID, so as to when using in current LTE-A
When PDSCH DMRS defined in system are scrambled, all transfer points using the scramble sequence generated based on identical original state,
So as to effective interference randomization can not be realized.I.e., in the diagram, the PDSCH that the transfer point for being arranged to 0 by cell ID sends
The PDSCH DMRS that DMRS can be sent with the transfer point for being arranged to 1 by its cell ID obtain mutually effective interference randomization
Effect, but identical effect can not be obtained between the transfer point with same cells ID.
Therefore, the invention discloses the original state needed for the scramble sequence of PDSCH DMRS is generated for rightly distribution
Method so that effective interference randomization is realized in the DAS of the multiple transmission point that there is shared same cells ID wherein.
As previously mentioned, the conventional art of DAS, for the PDSCH DMRS for transmitting in the downlink, according to cell
ID determining the original state of scramble sequence, so as to interference randomization can not be obtained between the transfer point with same cells ID
Effect.In order to solve this problem, the different transfer points in needing for same cells arrange the initial shape of different scrambling sequence
State.In the present invention, some essential conditions for the new original state using scramble sequence are provided as follows.
Condition 1：In DAS, each transmission point allows for using scramble sequence based on new original state.
Condition 2：In DAS, each transmission point is allowed for based on leaving original state and new original state is used
Scramble sequence.
Condition 3：According to the determination of network, leaving between original state and new original state, dynamic changes must be
It is possible.
Condition 1 is efficiently performed needed for interference randomization in the transmission to the UE for supporting DAS.Condition 2 is carried out
Multiuser MIMO (the MU- of the transmission to the UE for the not supporting DAS and UE for supporting DAS in same time and frequency resource
MIMO needed for).Leaving UE and can not supporting the scrambling sequence based on the new original state disclosed in the present invention for DAS is not supported
Row.In order to go to leave UE in same time and frequency resource by using multiple antennas and support new initial shape simultaneously
The MU-MIMO transmission of the UE of state, it is necessary to send PDSCH DMRS using based on the scramble sequence of original state is left, even if not
Successfully realize interference randomization also so.
Condition 3 is important, this is because can be directed to support that the UE of DAS perform transmission, or can be according to scheduler
Determination and be directed to the UE that DAS is supported in each transmission point and only support that both UE of conventional art is carried out transmitting.That is, exist
In specific time period, when the transmission of the UE for supporting the scramble sequence based on new original state is proceeded to, using based on it is new just
The scramble sequence of beginning state is scrambling DMRS.However, in another period, the UE that leaves for not supporting DAS, using based on something lost
Stay the scramble sequence of original state to scramble PDSCH DMRS.Support based on the scrambling for leaving original state with each transmission point is worked as
Sequence is similar with during the scramble sequence based on new original state, supports that the UE of DAS must support described two scramble sequences two
Person.
In order to utilize the scramble sequence based on new original state, need in the way of sharing between UE and eNB to determine
Original state.In the present invention, as the method for determining new original state, LTE-A is can be applicable to by open below
Multiple methods of system.Hereinafter, by the open method 1 to 6 for being used to determine the new original state for PDSCH DMRS.
Method 1：The side of original state is determined for according to the quantity of the position of CSI-RS ports 15 and CSI-RS ports
Method
CSI-RS is UE for measuring the reference signal of the channel of the downlink in LTE-A.In lte-a system,
CSI-RS corresponds to port 15 to 22.Table 1 shows the position and CSI-RS ends of possible CSI-RS ports 15 in lte-a system
The quantity of mouth.That is, table 1 shows the CSI- of the quantity of the CSI-RS ports of the normal cyclic prefix subframe with regard to lte-a system
The position of RS ports 15.
Table 1
As can be drawn from Table 1, when CSI-RS has port number 1,2,4,8,20,20,10 and 5 ports 15 of difference
Position is possible.Usually, CSI-RS is sent in diverse location positioned at in-plant transfer point, in order to avoid interference.Thus, lead to
The feature using the CSI-RS that diverse location is arranged in the transfer point in closely is crossed, can be in following equation (2)-(5)
The middle original state for determining the scramble sequence for the PDSCH DMRS in DAS.
Mathematical expression 2
When 1 port CSI-RS is arranged as follows：
Mathematical expression 3
When 2 port CSI-RS are arranged as follows：
Mathematical expression 4
When 4 port CSI-RS are arranged as follows：
Mathematical expression 5
When 8 port CSI-RS are arranged as follows：
Wherein, 1 port CSI-RS and 2 port CSI-RS have the CSI-RS ports of equal number.In this case, if
Put identical original state, rather than individually original state.
Determined using quantity of the equation given below (6) for the position according to CSI-RS ports 15 and CSI-RS ports
The other method of new original state.
Mathematical expression 6
Wherein, i has such as the value provided according to the quantity of CSI-RS ports in table 2.During table 2 shows equation (6)
According to quantity i of CSI-RS ports.
Table 2
The method that the original state of the new scramble sequence of PDSCH DMRS is provided for based on equation (6) is by comprehensive
Ground considers the possible quantity in CSI-RS ports and position to determine original state.Compared with equation (2)-(5), this method is changing
It is favourable to become on less position of original state.Based on the method that equation (6) determines the original state for PDSCH DMRS
Identical original state, Er Feidan can be set for 1 port CSI-RS and 2 port CSI-RS as in equation (2)-(5)
Only original state.
Method 2：The method that original state is determined for according to the position of CSI-RS ports 15
According to the position of CSI-RS ports 15, can determine for the new of PDSCH DMRS in following equation (7)
The original state of scramble sequence：
Mathematical expression 7
Wherein, i values can be according to the position of possible CSI-RS ports 15 in lte-a system as shown in table 3 come really
It is fixed.
Table 3
| Position | I values |
| The 200 of Fig. 2 | 0 |
| The 201 of Fig. 2 | 1 |
| The 202 of Fig. 2 | 2 |
| The 203 of Fig. 2 | 3 |
| The 204 of Fig. 2 | 4 |
| The 205 of Fig. 2 | 5 |
| The 206 of Fig. 2 | 6 |
| The 207 of Fig. 2 | 7 |
| The 208 of Fig. 2 | 8 |
| The 209 of Fig. 2 | 9 |
| The 210 of Fig. 2 | 10 |
| The 211 of Fig. 2 | 11 |
| The 212 of Fig. 2 | 12 |
| The 213 of Fig. 2 | 13 |
| The 214 of Fig. 2 | 14 |
| The 215 of Fig. 2 | 15 |
| The 216 of Fig. 2 | 16 |
| The 217 of Fig. 2 | 17 |
| The 218 of Fig. 2 | 18 |
| The 219 of Fig. 2 | 19 |
Method 3：The method for determining original state for according to the 8 port CSI-RS patterns including transmission CSI-RS patterns
In lte-a system, 1 port CSI-RS, 2 port CSI-RS and 4 port CSI-RS are entirely 8 port CSI-RS's
Increment formula, as shown in Figure 3.That is, the transmission location of 1 port CSI-RS, 2 port CSI-RS and 4 port CSI-RS is included in
In the transmission location of specific 8 port CSI-RS.By using this feature, can be 8 ports based on its corresponding CSI-RS
The increment formula of CSI-RS is determining the original state of the new scramble sequence for PDSCH DMRS.Table 4 illustrate according to based on
The i values of that the 8 port CSI-RS for including corresponding CSI-RS of lower equation (8).
Mathematical expression 8
Table 4
When for PDSCH DMRS new scramble sequence original state be according to equation (8) and table 4 come determine when,
All CSI-RS being included in 8 port CSI-RS of identical have identical original state.
Method 4：Determine for according to the relative position in the 8 port CSI-RS patterns including transmission CSI-RS patterns just
The method of beginning state
As shown in Figure 3, the CSI-RS of lte-a system is designed to have ad hoc rule.For example, Fig. 3 for transmission 2
The transmission location 300 and Fig. 3 of port CSI-RS for transmit the transmission location 304 of another 2 port CSI-RS with relative to
Including the identical relative position of the 8 port CSI-RS of corresponding 2 port CSI-RS.That is, the transmission location 300 of Fig. 3 is relative to 8
Transmission of the transmission location 304 of the relative position and Fig. 3 of the transmission location 330 of port CSI-RS relative to 8 port CSI-RS
The relative position of position 331 is identical.Relative position relative to 8 port CSI-RS can be utilized to determine for PDSCH
The original state of the new scramble sequence of DMRS, as shown in Table 5 below, table 5 is shown relative to port CSI-RS transmission position
The i values of the relative transport position in putting, and be based on equation below (9).
Mathematical expression 9
Table 5
In the above-mentioned methods, it is also considered that the quantity to CSI-RS ports is arranging i values.The phase of port 15 can also only be considered
The original state of the new scramble sequence for PDSCH DMRS is determined to position, as shown in Table 6 below, table 6 shows
According to the i values of the relative transport position of the port 15 in the CSI-RS transmission position of port, and it is based on equation below (10)
's.
Mathematical expression 10
Represent physical-layer cell identity, nSCIDThe quantity of scrambled code mark is represented, i values are arranged to CSI-RS ports
Quantity, nsRepresent the timeslot number of wireless frame in.
Table 6
When determine as in method 1-4 according to CSI-RS configuration the scramble sequence for PDSCH DMRS it is initial
During state, if being provided with multiple CSI-RS, can be determined according to multiple original states.
Method 5：For the method for determining original state according to high-level signaling
In method 1-4, the new initial of the scramble sequence of PDSCH DMRS is provided for according to the setting of CSI-RS
State.Such method realizes target in the case of performing in the extra signaling not needed between eNB and UE but according to rule,
So as to be difficult to according to situation come optimization.In order to overcome such shortcoming, eNB notify to UE by single high-level signaling
Will be using which original state.In this case, eNB can to UE notify the information corresponding with original state whole or
Person's part.Usually, because previously determining a part for original state, it is possible in the situation without additional notifications
Lower use value, and eNB only can notify remainder to UE.For example, come true as provided in equation (11)
Surely it is used for the new original state of the scramble sequence of PDSCH DMRS.
Mathematical expression 11
Wherein it is possible to be determined by single processTherefore, eNB can be with
Only the i for original state determination is carried out using the high-level signaling disclosed in the present invention in equation (11) is notified to UE.Such as etc.
In formula (11) like that, when i is in the range of 0 to K-1, then original state can be by altogetherIndividual position is come
The information of expression.
Original state can be determined with the equation (12) of Application way 5 and equation (11).
Mathematical expression 12
It is visible in equation (12), when compared with equation (11),Substituted by X.In equation (12), X has 9
Quantity of information and be utilized high-level signaling and notify to UE.In traditional LTE/LTE-A systems, for the original state of DMRSIt is the value determined by following UE：The UE need not be being received for primary synchronization signals in the case of independent high-level signaling
(PSS) and secondary synchronizing signal (SSS) synchronizing channel.Equation (12) disclosed in the present invention passes through high-level signaling based on eNB
The X that notifies to UE and i determining original state, and what non-used PSS and SSS determinedWhen profit in this way when, can
To select from the middle of the original state more than in equation (11).
Except as in equation (12) based on X and i come in addition to determining the method for original state, it is also possible to come merely with X
Determine original state.This is identical with when i is fixed as ' 0 ' always.This method is allowed to leaving defined in LTE/LTE-A
Original state for DMRS is reused, and it reduces the complexity of implementation.By this way, when next merely with X
When determining original state, eNB notifies will use which original state to UE by the high-level signaling with X.
Method 6：The method that original state is determined for according to the RNTI of UE
Method 5 determines new original state by using single high-level signaling.When Application way 5, due to high level
Signaling, overhead are inevitable.A mode for avoiding expense is the wireless network possessed by using each UE
Temporary identifier (RNTI) is determining original state.RNTI is used to identify UE, and is connected in LTE/LTE-A systems in UE
When send in a network, but regardless of whether UE performs coordinated multipoint transmission (CoMP) sending and receiving.By using basic offer
RNTI, the Additional higher layer signaling as in method 5 is unnecessary.In order to determine new initial shape by using RNTI
State, it is possible to use equation below (13) or equation (14).
Mathematical expression 13
Mathematical expression 14
In equation (14), G is greater than 1 integer.
Method 1-6 is used for the original state for determining the new scramble sequence for PDSCH DMRS.As previously mentioned,
When each transmission point in for DAS scrambles PDSCH DMRS, there are several conditions to be met.Method 1-5 determines and meets
The new original state of condition 1.In addition, the scrambling to PDSCH DMRS needs to be suitably used by leaving initially according to situation
Scramble sequence and the scramble sequence generated by the new original state determined by method 1-6 that state is generated.That is, leave initial
State and new original state need to change as the scheduling for each subframe determines.
For this function, the invention discloses for notifying which original state is used to via the PDCCH of LTE system
Method to DMRS scramblings.For this purpose, information ' CoMP scrambling indexes ' is newly added PDCCH and each eNB is under UE distribution
During uplink radio resource, the information is sent for notifying.' CoMP scrambles rope transmission information can be carried out via PDCCH
Draw ', but can also lead to by using the enhanced PDCCH (E-PDCCH) of the improvement channel as PDCCH in the same manner
Know it.
Table 7 is related to real for notifying which original state will be used to PDSCH DMRS scramblings first via PDCCH
Apply example.
Table 7
| CoMP scrambling indexes | For the original state of DMRS scramblings |
| 00 | Leave original state |
| 01 | New original state 1 |
| 10 | New original state 2 |
| 11 | New original state 3 |
Table 7 shows multiple new original states, because the cooperation transmission using multiple transmission point in DAS is possible
's.When being transmitted using cooperation, according to the determination of central controller, for each subframe, UE can be received in multiple transmission point
Any one in downlink transmission and can according to situation receive multiple transmission point in downlink transmission.
In table 7, leave original state and new original state there can be identical cell ID, but can also have
Different cells ID is allowing the cooperation between the transfer point with same cells ID and the transfer point of neighbor cell in DAS
Transmission.
It is in table 7, new to determine using one of method 1-6 disclosed in the present invention before the notice via PDCCH
Original state.In method 1-4, arrange to determine original state according to the CSI-RS for being set to UE, and in method 5, lead to
Cross independent high-level signaling and determine original state.In method 6, original state is determined by the RNTI of UE.
Table 8 is related to real for notifying which original state will be used to PDSCH DMRS scramblings second via PDCCH
Apply example.
Table 8
| CoMP scrambling indexes | For the original state of DMRS scramblings |
| 00 | Leave original state 1 |
| 01 | Leave original state 2 |
| 10 | New original state 1 |
| 11 | New original state 2 |
In table 8, exist and multiple leave original state and multiple new original states.Because using the conjunction of multiple transmission point
It is possible to transmit in DAS, so there are multiple new original states, is also allowed in not antenna form foundation in a distributed manner
Neighbor cell between cooperation transmission.In table 7 and table 8, multiple original states can leave initial shape including at least one
State.Present invention permission UE using new original state and leaves original state simultaneously.In the same way, can only use new
Original state.In table 7 and table 8, all original states of leaving are substituted or are removed by new original state.
2 can be utilized to perform the first of the scramble sequence for PDSCH DMRS via PDCCH disclosed by the invention
Beginning state notifying, as in previous embodiments.By using extra position, it is also possible to notify extra original state.Pass through
Using 1, can notify to use which that leave in original state and new original state.In the foregoing description, can be with
Cell ID of the Serving cell being implicitly connected to according to UE determine leave original state and need not single high-level signaling.
In aforesaid way, it is also possible to determine original state using single high-level signaling.
For to UE notify will using the other method of which original state using tradition lte-a system defined in
CoMP scramblings index and scrambled code identify the combination of (SCID).Table 9 is related to for notifying which original state will be by via PDCCH
For the 3rd embodiment scrambled to PDSCH DMRS.
Table 9
| CoMP scrambling indexes | SCID | For the original state of DMRS scramblings |
| 0 | 0 | Leave original state |
| 0 | 1 | New original state 1 |
| 1 | 0 | New original state 2 |
| 1 | 1 | New original state 3 |
Leave the least significant bit (LSB) that the SCID defined in LTE-A only determines the original state of the scrambling for DMRS.
However, when the method disclosed in the present invention is utilized, SCID can combine to determine other positions and use with CoMP scrambling indexes
In the LSB of the original state of the scrambling of DMRS.That is, in table 9, CoMP scramblings index and SCID determinations are determined by method 1-6
One of multiple original states, and non-legacy SCID only determines 1 LSB of original state.By said method determine it is multiple just
Beginning state really can be different on multiple positions.That is, when the CoMP for being used together table 9 scrambles index and during SCID, SCID will not be as
Determine the LSB of 1 in conventional art like that.Method 1-6 is used to determine that CoMP scramblings index and the combined information of SCID are specified
Which original state.
Table 10 is related to real for notifying which original state will be used to the to PDSCH DMRS scramblings the 4th via PDCCH
Apply example.
Table 10
| CoMP scrambling indexes | SCID | For the original state of DMRS scramblings |
| 00 | 0 | Leave original state 1 |
| 00 | 1 | Leave original state 2 |
| 01 | 0 | New original state 1 |
| 01 | 1 | New original state 2 |
| 10 | 0 | New original state 3 |
| 10 | 1 | New original state 4 |
| 11 | 0 | New original state 5 |
| 11 | 1 | New original state 6 |
In LTE-A, SCID is with the quantity of information of 1, but which is just sent out after with DMRS port distribution information combination
Send.In this case, only when the quantity of the DMRS port of distribution is 1 or 2, SCID can be ' 0 ' or ' 1 ', and
When the quantity of the DMRS port of distribution is 3 or more, SCID is fixed to ' 0 '.When using CoMP as in table 9 and table 10
During the combination of scrambling index and SCID, the original state for the scramble sequence of DMRS can be different original states, and
From it is different in the conventional technology, even if being assigned with 3 or more DMRS ports, it is also possible to distribute the scramble sequence for DMRS
Original state.
Even if when three or more DMRS ports are assigned with, by distributing different original states, between transfer point
Interference randomization be also possible in DAS.That is, when merely with SCID, if being assigned with three or more DMRS ends
Mouthful, then SCID always has ' 0 ' value, so as to use the original state of fixation.However, in the present invention is utilized together with SCID
During disclosed CoMP scramblings index, as in table 9 and table 10, even if SCID is ' 0 ', it is also possible to distribute different initial shapes
State.Such advantage be also applied for table 7 and table 8 disclosed in method.
Fig. 5 illustrates the DCI transmitted via PDCCH of the invention.
In Figure 5, via PDCCH, by CoMP scramblings index 500 and SCID510 and other DCI phases disclosed in the present invention
The information 520 of pass is transmitted together.Can recognize based on its generation and using scrambling sequence by using CoMP scrambling 500, UE of index
The original state of row, as mentioned above.In Figure 5, SCID510 be 1 information and leave defined in LTE/LTE-A systems with
Allow the MU-MIMO in a transfer point.The value is included in equation (1) in (10).Except as 1 information
Outside the transmission of SCID510, SCID510 can also distribute information combination for transmission with DMRS port.That is, UE can connect
Before receiving the CoMP scramblings index 500 and SCID510 of Fig. 5, one of Application way 1-6 is determining new original state.Afterwards, UE
The information of Fig. 5 is received from eNB via PDCCH, so as to notified which original state is used to scramble DMRS.
Fig. 6 illustrates procedure below of the invention：It is determined that for PDSCH DMRS new scramble sequence it is initial
State and eNB notify original state to UE, are generated based on the original state and have been used for the PDSCH DMRS to transmitting
The scramble sequence of scrambling.
In figure 6, eNB is determined how in step 600 and is arranged the CSI-RS configuration related to DAS.ENB is in step 610
In by high-level signaling to UE notify in step 600 determined by UE CSI-RS configuration.Notifying the CSI-RS configurations of UE
Afterwards, eNB performs scheduling in step 620 to determine which UE down-chain resources will be assigned to.Determine in step 620
After which UE PDSCH will be sent to, in act 630, eNB according to UE be whether support for DMRS scramblings it is new just
The UE of beginning state is performing corresponding operating.If determining that UE is not supported for the new of PDSCH DMRS scramblings in act 630
Original state, then eNB send in step 640 by based on leave original state scramble sequence scramble PDSCH DMRS.Such as
Fruit UE does not support new original state, as in step 640, does not then send the CoMP scrambling indexes disclosed in the present invention yet.
If however, determining that UE supports that new original state, eNB are determined at the beginning of which in step 650 in act 630
Beginning state will be used to generate the scramble sequence of UE.In step 650, the original state to UE to be applied can be such as table
7 or table 8 in such leave one of original state and new original state.In step 660, what is determined in step 650 is first
Beginning state is notified to UE via PDCCH or as the E-PDCCH of the enhancing channel of PDCCH.ENB is by PDSCH and PDSCH
DMRS and PDCCH sends jointly to UE.
In fig. 6 it is assumed that configure by CSI-RS determining new original state.I.e., it is assumed that one of using method 1-4.When
When using method 5 and method 6, it is also possible to the similar process of application, so as to which original state eNB can be notified using to UE.
Fig. 7 illustrates procedure below of the invention：It is determined that for PDSCH DMRS new scramble sequence it is initial
State and UE determine which original state has been applied to from eNB the PDSCH DMRS for sending.
In 700 the step of Fig. 7, the CSI-RS configuration related to DAS is notified from eNB to UE.By using in step 700
The CSI-RS configurations of middle notice, UE recognize the original state of the new scramble sequence for PDSCH DMRS, and in such situation
Under, it is possible to use one of method 1-4 disclosed in the present invention.UE use can also be notified to by using one of method 1-6
In the original state of the new scramble sequence of PDSCH DMRS.Configure regardless of the CSI-RS of step 700, eNB can pass through
High-level signaling is directly notified to UE will be using which original state.
Recognize in 700 and 710 the step of UE is in Fig. 7 new scramble sequence for PDSCH DMRS original state it
Afterwards, in step 720 by the use of the PDCCH or E-PDCCH receptions DCI as shown in Figure 5 of the enhancing channel as PDCCH
(520).The UE for having been received by DCI in step 720 recognizes original state using CoMP scramblings index 500, initial based on this
State, has generated used scramble sequence.If in step 730, CoMP scramblings index is ' 00 ', then UE is in step
Determine in 740 that the scramble sequence that eNB leaves original state generation using use when the PDSCH DMRS of downlink are sent is held
Row scrambling simultaneously receives Traffic Channel PDSCH in step 760.
If however, in step 730, CoMP scrambling indexes are not ' 00 ', then UE determines that scrambling is using by new
What the scramble sequence that original state is generated was performed, and industry is received in step 760 by using the scramble sequence in step 750
Business channel PDSCH.In figure 7 it is supposed that one of method 1-4 is used to be configured according to CSI-RS determines new original state, and
CoMP scrambling indexes are defined with 2 information and as in table 7.Similarly, the process can be applied to method 5,
Method 6 and table 8.
In the figure 7, scramble index to determine the original state of the scrambling for DMRS merely with CoMP.In addition, as in table 8
Use like that to SCID and CoMP scrambling indexes can also be applied to and identical process in Fig. 7.That is, as in table 8 that
Sample, in the figure 7 together using CoMP scrambling index and SCID, 720 the step of Fig. 7 in receive CoMP scrambling index and SCID simultaneously
Subsequently original state is determined using CoMP scramblings index and SCID in step 730.
In the lte-a system for supporting DAS, E-PDCCH can be supported for the effective transmission to control channel.Figure
8 illustrate the relation between E-PDCCH and PDSCH.In fig. 8, transmit in the specific part of the Radio Resource indicated by 800
E-PDCCH.E-PDCCH in part 800 is used to needed for the PDSCH of the particular UE indicated by UE notices reception 810
DCI.E-PDCCH is used as the enhancing channel of the PDCCH for leaving the control channel in LTE/LTE-A systems, and with lower section
Face is different greatly with PDCCH：E-PDCCH is similar with PDSCH can also to be operated based on DMRS, but PDCCH is always grasped based on CRS
Make.
When E-PDCCH is used based on DMRS, it is necessary to define original state, wherein PDCCH DMRS are based on the original state
Using scramble sequence.Usually, PDSCH DMRS notify E-PDCCH or PDCCH to UE, using the original state on them,
Generate the original state of scramble sequence.
However, with regard to the control channel of such as E-PDCCH etc, not existing and this other control channels being notified independently.
In order to solve this problem, with regard to E-PDCCH, arrange in the present invention and using for generating the scrambling for PDSCH DMRS
One of multiple original states of sequence.That is, with regard to E-PDCCH DMRS, it is always using based on corresponding original state and generate plus
Disturb sequence.E-PDCCH DMRS use one of original state of PDSCH DMRS.For example, if there is four as in table 7
Original state applicatory, then eNB one of these states are provided for the original state of E-PDCCH.
E-PDCCH is risen with the DMRS mono- scrambled using the scramble sequence generated based on default special original state
Send.For this purpose, UE for each subframe do not notify or nonrecognition original state (based on the original state, scramble sequence is given birth to
Into and be used to E-PDCCH scramble) in the case of, by using based on the E-PDCCH's for notifying in initial setting up
The scramble sequence of original state is receiving E-PDCCH.
The scrambling original state of the DMRS (or E-PDCCH DMRS) for E-PDCCH is arranged to PDSCH DMRS's
One of scrambling original state.In order to arrange the scrambling original state of E-PDCCH DMRS, eNB can be logical to UE using RRC signaling
Know the scrambling original state for PDSCH DMRS using which.Can be determined by the pre- authorization method between UE and eNB
The scrambling original state of E-PDCCH DMRS.For doing so, it is possible to use be provided with the middle of the transfer point of CS-RS configurations and have
The scrambling original state of the transfer point of maximum receiving intensity.Because UE can be periodically notified as each transmission point institute to eNB
The receiving intensity of the reference signal of measurement, so when using said method, UE can be in situation about not being notified independently from eNB
Under, determine following original states：Based on the original state, E-PDCCH is scrambled and scramble sequence is generated.
Although it has not been shown on the figures, but can be provide in UE and BS be able to carry out operation disclosed in the present invention and
The processor (or controller) of method 1 to 6 according to an embodiment of the invention.
According to the present invention, without in the case of the single notice of eNB, UE can recognize original state, wherein
Based on the original state, scramble sequence is generated and is used to scramble E-PDCCH.
In addition, UE and eNB can be by using realizing with identical little for determining the method for new original state
Interference randomization effect between the DMRS sent in the transfer point of area ID.
Furthermore, it is possible to utilize for determining the method for new original state to obtain scramble sequence.
Although specifically illustrating with reference to embodiments of the invention and describing the present invention, those of ordinary skill in the art
It will be understood that, various embodiments or change can be made to the present invention, without departing from the present invention limited by claim
Spirit and scope.Therefore, the scope of the present invention should be defined by claim and its equivalent, rather than by the embodiment
Definition.
Claims (10)
1. for the method in the middle original state for determining scramble sequence of distributing antenna system (DAS), the method includes one kind：
By high-level signaling reception value；And
The original state of scramble sequence is determined based on the value,
Wherein, the original state of the scramble sequence determined based on transfer point,
Wherein, the value includes the information related to multiple transmission point, and the plurality of transfer point shares same cell identifier, and
Wherein, the original state is determined based on the quantity and antenna pattern of antenna port.
2. the method for claim 1, wherein the original state is determined also based on the position of antenna port.
3. the method for claim 1, wherein the value includes 9.
4. the method for claim 1, wherein at least one of multiple original states are to leave original state.
5. the method for claim 1, wherein the original state is the value that previously passed high-level signaling is arranged.
6. for the device in the middle original state for determining scramble sequence of distributing antenna system (DAS), the device includes one kind：
Receptor, for by high-level signaling reception value；With
Controller, is configured to：
The original state of scramble sequence is determined based on the value,
Wherein, the original state of the scramble sequence determined based on transfer point,
Wherein, the value includes the information related to multiple transmission point, and the plurality of transfer point shares same cell identifier, and
Wherein, the original state is determined based on the quantity and antenna pattern of antenna port.
7. device as claimed in claim 6, wherein, the original state is determined also based on the position of antenna port.
8. device as claimed in claim 6, wherein, the value includes 9.
9. device as claimed in claim 6, wherein, at least one of original state is to leave original state.
10. device as claimed in claim 6, wherein, the original state is the value that previously passed high-level signaling is arranged.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2011-0100162 | 2011-09-30 | ||
| KR20110100162 | 2011-09-30 | ||
| KR10-2011-0102690 | 2011-10-07 | ||
| KR20110102690 | 2011-10-07 | ||
| KR10-2011-0113611 | 2011-11-02 | ||
| KR20110113611 | 2011-11-02 | ||
| KR1020110120072A KR20130035830A (en) | 2011-09-30 | 2011-11-17 | Method for apparatus for transmitting and receiving signal in distribution antenna system |
| KR10-2011-0120072 | 2011-11-17 | ||
| PCT/KR2012/007971 WO2013048220A1 (en) | 2011-09-30 | 2012-09-28 | Method and apparatus for transmitting and receiving signal in distributed antenna system |
Publications (2)
| Publication Number | Publication Date |
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| CN103959671A CN103959671A (en) | 2014-07-30 |
| CN103959671B true CN103959671B (en) | 2017-04-12 |
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| CN201280058009.7A Active CN103959671B (en) | 2011-09-30 | 2012-09-28 | Method and apparatus for transmitting and receiving signal in distributed antenna system |
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| JP (1) | JP6433788B2 (en) |
| KR (1) | KR20130035830A (en) |
| CN (1) | CN103959671B (en) |
| AU (1) | AU2012316918B2 (en) |
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| WO2012094635A1 (en) * | 2011-01-07 | 2012-07-12 | Interdigital Patent Holdings, Inc. | Method, system and apparatus for downlink shared channel reception in cooperative multipoint transmissions |
| CN110266462B (en) | 2015-05-12 | 2021-08-24 | 韩国电子通信研究院 | Transmitter transmission method and method performed by receiver through unlicensed band channel |
| WO2019136647A1 (en) * | 2018-01-10 | 2019-07-18 | 富士通株式会社 | Data transmitting method and device, and communication system |
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| KR20130035830A (en) | 2013-04-09 |
| RU2597219C2 (en) | 2016-09-10 |
| AU2012316918A1 (en) | 2014-03-06 |
| CN103959671A (en) | 2014-07-30 |
| JP2014535188A (en) | 2014-12-25 |
| RU2014117706A (en) | 2015-11-10 |
| AU2012316918B2 (en) | 2017-04-13 |
| JP6433788B2 (en) | 2018-12-05 |
| IN2014KN00907A (en) | 2015-10-09 |
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