CN105281880B - For the method and apparatus via relay backhaul link transmission signal - Google Patents
For the method and apparatus via relay backhaul link transmission signal Download PDFInfo
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- CN105281880B CN105281880B CN201510566572.0A CN201510566572A CN105281880B CN 105281880 B CN105281880 B CN 105281880B CN 201510566572 A CN201510566572 A CN 201510566572A CN 105281880 B CN105281880 B CN 105281880B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
Abstract
Disclose a kind of method and apparatus for via relay backhaul link transmission signal.It discloses one kind to be used in a wireless communication system, the method and apparatus that relay is transferred signals at base station (BS).This method includes：Reference signal (RS) is mapped to tool, and there are two the subframes of time slot, and transmit the subframe to relay.Each in time slot includes that can extend multiple continuous resource elements of RS above, and last orthogonal frequency division multiplexing (OFDM) Overlapping Symbol of multiple continuous resource element and the time slot.If the last OFDM symbol of subframe is disabled the relay, only the RS is transmitted in the first time slot of subframe.
Description
The application be on July 23rd, 2012 international filing date submitted be on January 28th, 2011 application No. is
(201180006874.2 PCT/KR2011/000610's), it is entitled " for believing via relay backhaul link transmission
Number method and apparatus " patent application divisional application.
Technical field
The present invention relates to wireless communications, and more particularly, to one kind for via relay backhaul link transmission
The method and apparatus of signal.
Background technology
Wireless communication system has widely been deployed to provide various types of communications including voice-and-data service
Service.In general, wireless communication system is by sharing available system resource between a plurality of users (for example, bandwidth, biography
Defeated power etc.) come the multiple access system that supports the communication of multiple users.It is more that such as code point may be used in the multiple access system
Location (CDMA), frequency division multiple access (FDMA), time division multiple acess (TDMA), orthogonal frequency division multiple access (OFDMA) or single-carrier frequency division multiple access
(SC-FDMA) multiple access schemes.
Invention content
Technical problem
Be designed to deal with problem it is an object of the invention to solve for efficiently being passed in relay system
The problem of method and apparatus of defeated signal.
Be designed to deal with problem another object of the present invention is to solve in relay system efficiently
The problem of transmission of reference signals and/or the method and apparatus of data.
Those skilled in the art will be appreciated that the purpose that the present invention can be used to realize is not limited in upper stationery
The content described to body, and will be more clearly understood that the present invention can be realized the following specifically describes in from what is carried out in conjunction with attached drawing
Other purposes.
Solution to the problem
The purpose of the present invention can be by providing for being transferred signals at base station (BS) in a wireless communication system
The method of relay realizes, the method includes reference signal (RS) is mapped to tool, there are two the subframes of time slot and will
The sub-frame transmission is to relay.Each in time slot includes the multiple continuous resource elements that can extend RS above
Element, and last orthogonal frequency division multiplexing (OFDM) Overlapping Symbol of multiple continuous resource element and time slot.If subframe
Last OFDM symbol relay is disabled, only transmitting RS in the first time slot of subframe.
In another aspect of this invention, the BS in provided wireless communication system, including radio frequency (RF) herein
Unit and processor.Processor is suitable for RS being mapped to the subframe having there are two time slot, and transmits the subframe to relaying dress
It sets.Each in time slot includes that can extend multiple continuous resource elements of RS above, and multiple continuous
Resource element is Chong Die with the last OFDM symbol of time slot.If the last OFDM symbol of subframe is unavailable to relay
, then only RS is transmitted in the first time slot of subframe.
If the last OFDM symbol of subframe is available relay, can be passed in two time slots of subframe
Defeated RS.
It can be continuous on time in each of multiple continuous resource element in a slot.
Multiple continuous resource element can be in a slot each in two resource elements continuous in time
Element.
If only transmitting RS in the first time slot of subframe, in the second time slot of subframe, data-signal can be reflected
It is mapped in at least part wherein capableing of in multiple continuous resource elements of extended reference signal.In this case, exist
In second time slot of subframe, data-signal can be mapped in addition to last with the subframe among multiple continuous reference elements
OFDM symbol overlapping resource element except surplus resources element.In the second time slot of subframe, data-signal can make
It is extended with for transmitting orthogonal code used in RS in multiple continuous resource elements.
Advantageous effect of the invention
According to an embodiment of the invention, signal can efficiently be transmitted in relay system.Specifically, Neng Gou
Efficiently transmission of reference signals and/or data in relay system.
Those skilled in the art will be appreciated that the effect that can be realized through the invention is not limited in upper stationery
The content described to body, and will be more clearly understood that the present invention's is other excellent the following specifically describes in from what is carried out in conjunction with attached drawing
Point.
Description of the drawings
The attached drawing for being included to provide a further understanding of the present invention shows the embodiment of the present invention, and appended attached
Figure and this description together principle used to explain the present invention.
In figure：
Fig. 1 illustrates the network configurations for evolved universal mobile communication system (E-UMTS) system.
Fig. 2 illustrates the radio frame structure in E-UMTS systems.
Fig. 3 illustrates the structure of the resource grid for radio frame.
Fig. 4 illustrates downlink subframe structure.
Fig. 5 illustrates the operation of the signal transmission in multiple-input and multiple-output (MIMO) scheme.
Fig. 6 illustrates downlink reference signal (RS) pattern in long term evolution (LTE) system.
Fig. 7 illustrates demodulated reference signal (DRS) structure for being added to advanced LTE (LTE-A) system.
Fig. 8 illustrates the wireless communication system with relay.
Fig. 9 illustrates the exemplary backhaul transport in Multicast Broadcast Single Frequency rate network (MBSFN) subframe.
Figure 10 is illustrated when relay could not receive last orthogonal frequency division multiplexing (OFM) symbol of backhaul subframe
When, in the exemplary issue that demodulated reference signal (DM RS) reception period generates.
Figure 11 and 12 is the stream for the DM RS transmission operations for illustrating evolution node B according to an embodiment of the invention (eNB)
Cheng Tu.
Figure 13 is the flow chart for the channel estimating operation for illustrating relay according to an embodiment of the invention.
Figure 14 and 15 is illustrated when the last OFDM symbol of subframe is disabled relay, and the second of subframe
Exemplary signal transmission in time slot.
Figure 16 is the flow chart for the DM RS transmission operations for illustrating eNB according to another embodiment of the present invention.
Figure 17 is the flow for the channel estimating operation for illustrating user equipment (UE) according to another embodiment of the present invention
Figure.
Figure 18 is illustrated when the second time slot disabling DM RS for subframe transmit (Tx), in the second time slot of subframe
Exemplary signal is transmitted.
Figure 19 be suitable for the invention base station (BS), relay or relay node (RN) and UE box
Figure.
Specific implementation mode
Detailed reference, the example quilt of described the preferred embodiment of the present invention now are carried out to the preferred embodiment of the present invention
It is illustrated in the drawings.The embodiment of the present invention is suitable for various wireless access technologys, such as CDMA (CDMA), frequency division multiple access
(FDMA), time division multiple acess (TDMA), orthogonal frequency division multiple access (OFDMA) and single-carrier frequency division multiple access (SC-FDMA).CDMA energy
It is enough to be realized as such as radiotechnics of general land wireless access (UTRA) or CDMA2000.TDMA can be by as all
Such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/enhanced data rates for gsm evolution (EDGE)
Radiotechnics is realized.OFDMA can be by as 802.11 (Wireless Fidelity of such as Institute of Electrical and Electronics Engineers (IEEE)
(Wi-Fi)), IEEE 802.16 (worldwide interoperability for microwave accesses (WiMAX)), IEEE 802.20, evolution UTRA (E-UTRA)
Radiotechnics is realized.UTRA is a part of Universal Mobile Communication System (UMTS).Third generation partner program (3GPP)
Long term evolution (LTE) be using a part of the evolution UMTS (E-UMTS) of E-UTRA, use OFDMA for downlink and
Uplink is used for using SC-FDMA.Advanced LTE (LTE-A) is the evolution of 3GPP LTE.
It is described below although giving, focuses on 3GPP LTE/LTE-A to illustrate description, this is merely exemplary
And therefore should not be interpreted limitation the present invention.
Fig. 1 shows the network configuration for E-UMTS systems.E-UMTS is the evolution of wideband CDMA (WCDMA) UMTS,
And 3GPP is dedicated to the standardization of E-UMTS.E-UMTS is also referred to as LTE.For the thin of UMTS and E-UMTS technical specifications
Section refers to " third generation partner program respectively；The version 7 and version 8 of technical specification group radio access network ".
With reference to figure 1, E-UMTS systems include user equipment (UE) 120, evolution node B (eNB or e node B) 110a and
110b and it is connected to the access gateway of external network in the end of evolution UMTS Terrestrial Radio Access Networks network (E-UTRAN)
(AG).ENB can be transmitted simultaneously for multiple data flows to multicast service and/or unicast services.One eNB manages one
Or multiple cells (for example, three cells).Cell is configured in one in 1.4,3,5,10,15 and 20MHz of bandwidth
Downlink or uplink transmission services are provided to multiple UE.Different cells can be set to different bandwidth.ENB is controlled
Make the data transmission and reception of multiple UE.For down link data, eNB notifies UE by communicating downlink scheduling information
Time/frequency region, compilation scheme, size of data and hybrid automatic repeat-request for bearing downlink link data
(HARQ) related information etc..For uplink data, eNB notifies UE can to UE by transmitting uplink scheduling information
Time/frequency region, compilation scheme, size of data, information related with HARQ etc..Interface can be established between eNB,
To transmit customer service or control business.Core net (CN) may include the AG and network node of the user registration for UE.
AG manages the mobility of UE on the basis of tracking area (TA).TA includes multiple cells.
Fig. 2 illustrates the radio frame structure in E-UMTS systems.
With reference to figure 2, E-UMTS systems use 10 milliseconds of radio frames.Radio frame is divided into 10 subframes.Per height
Frame is all further divided into two time slots, is each 0.5ms on the duration and has multiple symbols (for example, OFDM
Symbol or SC-FDMA symbols).
Fig. 3 illustrates the structure of the resource grid of the duration for a time slot.
With reference to figure 3, time slot includes temporal multiple OFDM symbols or SC-FDMA symbols are multiplied by multiple resources in frequency
Block (RB).One RB has a resource element in 12 × 7 (6) (RE).The number of RB in time slot is depended on for cell setting
Bandwidth.Each unit in resource grid is referred to as RE.RE is the least unit of resource, include for symbol it is lasting when
Between a subcarrier.Although time slot and RB are shown respectively including 7 symbols and 12 subcarriers in figure 3, this is only
It is merely exemplary and does not therefore limit the present invention.For example, the number of the symbol per time slot depends on cyclic prefix (CP)
Length.
Fig. 4 illustrates downlink subframe structure.
With reference to figure 4, in the downlink subframe in LTE system, layer 1 (L1)/control zone (L2) of layer 2 and data field with when
Multiplexing (TDM) is divided to be multiplexed.L1/L2 occupies control zone n OFDM symbol of the foremost of downlink subframe (for example, before most
Three of face or four OFDM symbols), and the remaining OFDM symbol of downlink subframe is occupied in data field.It wraps the control zones L1/L2
The physical downlink control channel (PDCCH) for bearing downlink link control message is included, and data field includes downlink
Data channel, physical down link sharing channel (PDSCH).In order to receive down link signal, UE reads downlink chain from PDCCH
Road scheduling information.Then UE receives downlink based on the resource allocation information indicated by downlink schedule information on PDSCH
Link data.Resource (that is, PDSCH) for UE scheduling is distributed on the basis of RB or on the basis of RB groups.
PDCCH will be with the resource that is used for transmission channel, paging channel (PCH) and downlink sharied signal channel (DL-SCH)
It distributes related information, uplink scheduling license and HARQ information and is delivered to UE.The control information carried on PDCCH
Commonly referred to as down link control information (DCI).Various DCI formats are defined according to the content of DCI.
Table 1 illustrates the DCI format 0 for uplink scheduling.
Table 1
[table 1]
| Field | Bit | Annotation |
| Format | 1 | Uplink is permitted or line link is specified |
| Frequency hopping mark | 1 | Frequency frequency hopping ON/OFF |
| RB is specified | 7 | It is assigned to the resource block of PUSCH |
| MCS | 5 | Modulation scheme, compilation scheme etc. |
| New data indicator | 1 | For each new transmission block switching |
| TPC | 2 | The power control of PUSCH |
| DMRS cyclic shifts | 3 | The cyclic shift of demodulated reference signal |
| CQI request | 1 | CQI feedback is asked by PUSCH |
| RNTI/CRC | 16 | The 16 bit RNTI encoded with being included in CRC |
| Filling | 1 | In order to ensure format 0 matches format 1A in size |
| It amounts to | 38 | - |
*MCS：Modulation and coding scheme.
*TPC：Transmission power control
*RNTI：Radio network temporary identifier
*CRC：Cyclic redundancy check
For which specify the UE of PDCCH to be identified by RNTI.For example it is assumed that the CRC of PDCCH is sheltered by RNTI A,
And PDCCH delivers uplink resource allocation message B (for example, frequency location) and transport format information C (for example, transmission block
Size, modulation scheme, compiling information etc.), UE monitors PDCCH using the RNTI of the their own in cell, and has
The UE of RNTI A is based on the information B and C obtained from the PDCCH with RNTI A come transmitting uplink signals.
Fig. 5 is illustrated to be transmitted according to the exemplary signal of multiple-input and multiple-output (MIMO) scheme and be operated.
With reference to figure 5, scrambler 301 scrambles code word.Each code word includes and the ratio of the corresponding compiling of transmission block
Spy's stream.Modulation mapper 302 is according to the type and/or channel status for transmitting signal, with binary phase shift keying (BPSK), four phases
Phase-shift keying (PSK) (QPSK), 16 yuan of quadrature amplitude modulations (16QAM) or 64 yuan of quadrature amplitude modulations (64QAM) are by scrambled code
Word is modulated to complex symbol.Complex symbol is mapped to one or more layers by layer mapper 303.
By the signal transmission of individual antenna, a code word is mapped to a layer.Passing through multiple days
In the case of the signal transmission of line, depending on transmission plan code word can be different to layer mapping relations.Table 2 and table 3 illustrate and show
Example property code word is to layer mapping relations.
Table 2
[table 2]
Table 3
[table 3]
Table 2 describes the code word for spatial reuse and is mapped to layer, and table 3 describes and is used for transmission the code word of diversity to layer
Mapping.In table 2 and table 3, x (a) (i) indicates i-th of symbol with the layer of index a, and d (a) (i) indicates there is index a
Code word i-th of symbol.
As from being pointed out in table 2 and table 3, a code word can be mapped to a layer on the basis of symbol.However, such as
Under the second situation of table 3, a code word can be assigned to up to four layers.In the code word distributed to layer maps, often
The symbol of a code word is sequentially mapped to layer.
Although table 2 and table 3 are based on up to two code words and up to four layers of hypothesis, this is illustrative.Cause
This depends on system, and the maximum number of code word and layer for signal transmission can be different.
The signal that layer maps is multiplied by the pre-coding matrix selected according to channel status by precoder 304, and by phase
The signal multiplied distributes to transmission antenna.RE mappers 305 will be mapped to time-frequency RE for the transmission signal of corresponding antenna.Then
Ofdm signal generator 306 passes through transmission signal of the corresponding antenna transmission through mapping.
Fig. 6 illustrates downlink reference signal (RS) pattern in LTE system.
With reference to figure 6, two kinds of downlink RS is defined for the unicast services in LTE system, with channel status
The public RS (CRS) 0 to 3 of information collection and measurement as target, for example, the transfer and UE for being modulated to target with data are special
Determine RS.The specific RS of UE are also referred to as dedicated RS (DRS).The specific RS of UE are used to demodulate Beam-formed data.CRS quilts
For both channel information acquisition and data demodulation.CRS is that cell is specific, and passes through the whole in each subframe
Frequency band transmits.Because LTE system supports up to four transmitting (Tx) antennas on the uplink, institute is for up to four days
The CRS of line end mouth can be transmitted at eNB according to the number of Tx antennas.In LTE system, CRS passes through antenna port 0 to 3
It transmits, and the specific RS D of UE are transmitted by antenna port 5.
Up to eight Tx antennas should be able to be supported on the uplink from the lte-a system of LTE system evolution.Therefore,
Lte-a system should support the RS for up to eight Tx antennas.Due to fixed only for up to four Tx antennas in LTE system
Justice downlink RS, so when eNB has four to eight downlink Tx antennas in lte-a system, it should be directed to volume
Outer antenna port extraly defines RS.
Fig. 7 illustrates the exemplary patterns for the demodulated reference signal (DM RS) for being added to lte-a system.When signal passes through
When mutiple antennas is transmitted, DM RS are the specific RS of UE for being demodulated to every layer signal.DM RS are used for PDSCH and relaying
The demodulation of device-PDSCH (R-PDSCH).Since lte-a system uses up to eight Tx antennas, so it needs up to eight
Layer and for corresponding layer DM RS.For convenience's sake, it is referred to as DM RS (layer) 0 to 7 for the DM RS of layer 0 to 7.
With reference to figure 7, DM RS for two or more layers are multiplexed on identical RE with code division multiplexing (CDM).For
More specific, the DM RS for corresponding layer are using extended code (for example, such as Wash codes or discrete Fourier transform (DFT)
The orthogonal code of code) it extends, and be then multiplexed into identical RE.For example, the DM for the DM RS of layer 0 and for layer 1
RS is multiplexed in identical RE.Specifically, the DM RS of layer 0 and layer 1 are used in two OFDM symbols 12 and 13 in subcarrier
It is extended using orthogonal code at 1 (k=1).That is, for layer 0 and layer 1 DM RS using have in time extension because
The code of sub (SF)=2 extends, and is multiplexed in identical RE in each time slot.Expansion for layer 0 and the DM RS of layer 1
Show code can be such as [+1+1] and [+1-1] respectively.Similarly, the DM RS for being used for layer 2 and layer 3 are used not in identical RE
With orthogonal code extend.DM RS for layer 4,5,6 and 7 are in the RE occupied by DM RS0 and 1 and DM RS 2 and 3
It is extended using the code orthogonal with the extended code of DM RS for layer 0,1,2 and 3.For up to four layers, there is SF=
2 code is used for DM RS, however for five or more layer, the code with SF=4 is used for DM RS.In LTE-A systems
In system, the antenna port for DM RS is given { 7,8 ..., n+6 } (n is the number of layer).
Table 4 lists the sequence spreading for antenna port 7 to 14 defined in LTE-A below.
Table 4
[table 4]
Reference table 4, each of the identical orthogonal code with length 2 in the orthogonal code for antenna port 7 to 10
Middle repetition.Therefore, the orthogonal code with length 2 is used in timeslot-level for up to four layers.For five or more layer, in son
The orthogonal code with length 4 has been used at frame level.
Fig. 8 illustrates the wireless communication system with relay.Relay or relay node (RN) extend
The coverage of eNB, or be installed in shadow region with to improve reliable service.
With reference to figure 8, wireless communication system includes eNB, relay and UE.UE is communicated with eNB or relay.
For convenience's sake, the UE communicated with eNB is referred to as macro UE, and the UE communicated with relay is referred to as relaying dress
Set UE.Communication link between communication link and relay between eNB and macro UE and relay UE is hereinafter referred to as macro
Access link and relay access link.Communication link between eNB and relay is referred to as backhaul link.
Fig. 9 illustrates the exemplary backhaul transport in Multicast Broadcast Single Frequency Network (MBSFN) subframe.For being filled with interior relaying
It sets, eNB to relay link (that is, backhaul link) is worked in relay to UE links (that is, relay accesses chain
Road) identical frequency band.The case where relay transfers signals to UE while it just receives signal or vice versa from eNB
Under, the transmitter and receiver of relay interferes with each other.Therefore, it may be limited to simultaneous in identical frequency resource
ENB is transmitted to relay and relay to UE.For this purpose, backhaul link and relay access link are being time-multiplexed
(TDM) it is divided in.In lte-a system, backhaul link is established in the MBSFN subframe, to support to be located at relay area (puppet
(fake) MBSFN made) in old LTE UE measurement.If subframe is used signal transmission as MBSFN sub-frame, UE
It only receives the control zone (ctrl) of subframe and therefore relay can configure backhaul link using the data field of subframe.
Embodiment 1
Since propagation delay, reception/transmission (Rx/Tx) switching of relay, the system between eNB and relay are set
It sets, relay may not receive the last OFDM symbol of backhaul subframe.This is because relay should be last
From Rx pattern switchings to Tx patterns at the time of OFDM symbol, in order to transmit the first OFDM symbol of next subframe.
Figure 10 is illustrated when relay could not receive the last OFDM symbol of backhaul subframe, is received in DM RS
Period leads to the problem of.
With reference to figure 10, if relay could not receive the last OFDM symbol of the index 13 with backhaul subframe,
Then relay does not receive the part for the RE for distributing to DM RS.As described in earlier in respect of figures 7, for two or more
The DM RS of multilayer share identical RE in CDM.Therefore, it if relay does not receive OFDM symbol 13, is accorded in OFDM
The RE of carrying DM RS is not useful in terms of channel estimation in numbers 12.In the case of the RE of no OFDM symbol 13, relaying
Device can not detach the multiple DM RS being multiplexed in the RE of OFDM symbol 12 and 13 by going to extend.Therefore, OFDM symbol
12 DM RS RE cause unnecessary expense to backhaul transport and reception, to waste of resource.
In order to avoid this problem, the DM RS RE of the second of subframe the last OFDM symbol can be used as by relay
Data RE, if relay can not receive the last OFDM symbol of subframe.For example, if relay can not
OFDM symbol 13 as illustrated in Figure 10 is received, then eNB transmission data signals in the DM RS RE of OFDM symbol 12, and in
The data of its own of the data carried in device is to the DM RS RE including OFDM symbol 12 are decoded.In such case
Under, relay executes channel estimation using only the DM RS RE in the first time slot of subframe, and is based on the channel estimation
The data of first and second time slots are decoded.That is, if relay can not receive the last of subframe
OFDM symbol then transmits DM RS only in the first time slot of subframe.Therefore, it is possible to improve the utilization of radio resource.
Figure 11,12 and 13 are the course diagrams for illustrating signal processing operations according to an embodiment of the invention.Specifically,
Figure 11 and 12 illustrates the DM RS transmission operations at eNB, and Figure 13 illustrates the channel estimating operation at relay.
With reference to figure 11, eNB generates the DM RS sequences (or DM RS sequences) (S1110) for every layer.DM RS sequences can be with
It is but not limited to pseudo-random sequence, Zadoff-chu sequences or constant amplitude zero auto-correlation (CAZAC) sequence.For example, with reference to old
LTE system in the RS sequences for antenna port 5 generation, DM RS sequences can be defined as
Mathematics Fig. 1
[mathematical expression 1]
Wherein m is the integer of 0 or bigger, and c (m) is the pseudo-random sequence provided by [equation 2].Pseudo-random sequence is by growing
31 golden formula (Gold) sequence is spent to define.
Mathematics Fig. 2
[mathematical expression 1]
C (n)=(x1(n+NC)+x2(n+NC))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein Nc=1600 and n=1,2 ..., 30.First gold medal formula sequence can be initialized to
x1(0)=1, x1(n)=0
And the second gold medal formula sequence can be initialized to
nsIndicate time slot index,
ns
It indicates cell ID, and is constant.
Then eNB determines whether relay can use the last symbol (S1120) of subframe.Can according to eNB and
How the sub-frame boundary of relay to configure, to make a determination in different ways.Therefore, last symbol is to relaying
Whether device, which is available, to be indicated by system information or radio resource control (RRC) signaling.If subframe is last
Symbol relay is available, then eNB transmits DM RS (S1130) in the first and second time slots of subframe.This
In the case of, DM RS can be transmitted in a manner of illustrated in Fig. 7.On the other hand, if the last sequence pair relaying of subframe
Device is disabled, then eNB transmits DM RS (or multiple DM RS) (S1140) only in the first time slot of subframe.In other words
It says, the DM RS (or multiple DM RS) in the second time slot of subframe are not transferred to relay by BS.In this case, data
(R-PDSCH) the DM RS RE for the second time slot for being intended for relay can be mapped to.The transmission process of DM RS can
To include but not limited to that precompile, RE mappings and ofdm signal generate.
With reference to figure 12, BS can be operated differently according to signal receiver.For convenience it is assumed that relay is not
The last OFDM symbol of subframe can be used.ENB with illustrated similar fashion in Figure 11 substantially to operate.First,
ENB generates the DM RS sequences (or multiple DM RS sequences) (S1210) for every layer.Then eNB determines receiving terminal to receive DM
RS (or multiple DM RS) (S1220).If DM RS will be transferred to macro UE by eNB, BS is for example with illustrated side in Fig. 7
Formula transmits DM RS (S1230) in the first and second time slots of subframe.On the other hand, if DM RS will be transferred to by eNB
Relay, then eNB DM RS are only transferred to relay (S1240) in the first time slot of subframe.That is, in son
There is no DM RS to be transferred to relay in second time slot of frame.In this case, data (R-PDSCH) can be mapped
To the DM RS RE of the second time slot of the subframe for being intended for relay.Although independently having described Figure 11's and 12
Process, but they can be combined into a process.
With reference to figure 13, relay from eNB receive include DM RS (or multiple DM RS) subframe (S1310).Subframe is
Backhaul subframe, preferably MBSFN sub-frame.Relay determines if that the last symbol (S1320) of subframe can be used.
Relay whether can using the last symbol of subframe by system information or RRC signaling come pre-determining or instruction.In if
The last symbol of subframe can be used after device, then relay is used and received in the first and second time slots of subframe
DM RS (or multiple DM RS) execute channel estimation (S1330).In such a case, it is possible in a manner of illustrated in Fig. 7
To receive DM RS (or multiple DM RS).On the other hand, if relay can not use the last symbol of subframe, in
Channel estimation (S1340) is executed based on the DM RS (or multiple DM RS) received in the first time slot of subframe after device.
That is, being not received by DM RS in the second time slot of subframe.In this case, data (R-PDSCH) are mapped to
It is intended for the DM RS RE of the second time slot of the subframe of relay.
Figure 14 and 15 illustrate when the last OFDM symbol of subframe to relay is unavailable when, subframe second when
Exemplary signal transmission in gap.When performing operation above-mentioned, the different layer (multi-users in identical RB can be passed through
MIMO (MU-MIMO)) come simultaneously transmit the UE for being connected directly to eNB direct link signal and be used for relay
Returned signal.In this case it is necessary to which additional operation goes to extend to help UE to carry out accurate DM RS.For this purpose,
Backhaul data signal in OFDM symbol 12 is expanded using the CDM codes for DM RS corresponding with the layer of backhaul data signal
Exhibition, and transmitted in the DM RS RE of OFDM symbol 13.This means that eNB use for the number in OFDM symbol 12 and 13
It is believed that number the CDM codes of floor corresponding DM RS extend the data-signal for backhaul link.
With reference to figure 14 and 15, it is assumed that returned signal uses layer 1 using layer 0 and direct link signal in MU-MIMO.Also
It is assumed that the signal of layer 0 and 1 uses the CDM codes [w in two continuous DM RS RE respectively0,0w0,1] and [w1,0w1,1] expand
Exhibition.If data-signal S1,12 will be transmitted as the returned signal at subcarrier 1 (k=1) in OFDM symbol 12, then
ENB transmits the signal w at subcarrier 1 in OFDM symbol 120,0*S1,12With in OFDM symbol 13 at subcarrier 1
Data-signal S1,12, w0,1*S1,12Extended version.In order to help relay data detection signal, it to be used for OFDM symbol 12
Phase rotated appropriate is undergone with the backhaul link DM RS extended codes of OFDM symbol 13 so that the symbol phase of extended code exists
For 0 (that is, using CDM codes [1w in OFDM symbol 120,1/w0,0] in the examples described above 1) S1,12 is multiplied by.
From the angle of relay, relay simply discards the last symbol of subframe and is carried out to R-PDSCH
Demodulation/decoding, it is contemplated that data-signal is similarly carried in the DM RS RE of the second last OFDM symbol of subframe.Together
When, from the angle for the UE for being connected directly to eNB, if transmitted in DM RS RE using the signal for UE and MU-
The returned signal of MIMO operation, then returned signal extended using the code orthogonal with the DM RS of UE, be several but regardless of returned signal
It is believed that number or RS.Therefore, UE to the signal in its DM RS RE extend, and is come using the signal for going to extend
Channel estimation is executed, as done when being employed for the signal of another UE and MU-MIMO operation when its signal.
Aforesaid operations are also applied for the subframe for having 12 OFDM symbols in the CP of extension.
Embodiment 2
When UE is directly connected to eNB, that is to say, that access link is based upon between UE and eNB, and eNB is in son
DM RS are transmitted in two time slots of frame, as illustrated in fig. 7.However, in any case, DM RS may not necessarily be in subframe
It is transmitted in two time slots.For example, if channel change at leisure it is either static, even if using the DM in a time slot
RS estimates that the channel in another time slot, data demodulation may not also go wrong.Therefore, in this embodiment, in time slot
DM RS Tx are selectively enabled or disable.Therefore, it is possible to reduce DM RS expenses.
Figure 16 and 18 illustrates signal processing operations according to another embodiment of the present invention.Specifically, Figure 16 is illustrated
The DM RS transmission operations of eNB, and Figure 17 illustrates the channel estimating operation of UE.
With reference to figure 16, eNB generates the DM RS sequences (or multiple DM RS sequences) (S1610) for every layer.DM RS sequences
It can be but not limited to pseudo-random sequence, Zadoff-chu sequences or CAZAC sequences.For example, with reference to being used in old LTE system
The RS sequences of antenna port 5 generate, and DM RS sequences can use [equation 1] and [equation 2] to define.
Then BS determine DM RS Tx in the second time slot of the subframe of UE whether disabled (S1620).DM RS Tx prohibit
With/enable by higher (for example, rrc layer) or physical layer to be arranged.DM RS Tx are disabled/enabled can be by with various sides
Formula signal transmission to UE.For example, DM RS Tx disabling/it is enabled can be by higher level signaling (for example, RRC signaling) by half
Statically it is indicated to UE.In addition, DM RS Tx disabling/it is enabled can be by physical layer signaling (for example, via being distributed for DL
PDCCH it) is dynamically indicated to UE.In addition, the information that instruction DM RS disablings are allowed to and the beginning about DM RS disablings
It can be transmitted by higher level signaling with the information of duration, and actual DM RS Tx disablings/enabled can be by physics
Layer signaling indicates.DM RS Tx are disabled/enabled can be in view of channel status be (for example, whether channel status is (partly) quiet
State) the case where get off setting.
If DM RS Tx are not disabled, that is to say, that it is enabled in the second time slot of subframe for UE, then
DM RS (or multiple DM RS) are transferred to for example in a manner of illustrated in Fig. 7 in the first and second time slots of subframe by eNB
UE(S1630).On the other hand, if DM RS Tx are disabled in the second time slot for UE, eNB is only the first of subframe
DM RS (or multiple DM RS) (S1640) are transmitted in time slot.That is, there is no DM RS to be passed in the second time slot of subframe
It is defeated.In this case, data (PDSCH) can be mapped to the position of the DM RS in the second time slot of subframe.DM RS's
Transmission process can include but is not limited to precompile, RE mappings and ofdm signal and generate.
With reference to figure 17, UE from eNB receive include DM RS (or multiple DM RS) subframe (S1710).UE determines DM RS
Whether Tx by the second time slot for subframe disables (S1720).DM RS Tx disablings/enable to be retouched by reference to Figure 16
Various types of signalings for stating are arranged.If DM RS Tx are enabled by the second time slot for subframe, UE uses are in son
The DM RS (or multiple DM RS) that are received in first and second time slots of frame execute channel estimation (S1730).In this feelings
Under condition, DM RS (or multiple DM RS) can be received in a manner of illustrated in Fig. 7.On the other hand, if DM RS Tx quilts
It is disabled for the second time slot of subframe, then UE is based on the DM RS (or multiple DM RS) received in the first time slot of subframe
To execute channel estimation (S1740).That is, being not received by DM RS in the second time slot of subframe.In such case
Under, data (PDSCH) can be mapped to the position of the DM RS in the second time slot of subframe.
Figure 18 is illustrated when DM RS Tx are disabled by the second time slot for subframe, showing in the second time slot of subframe
Example property signal transmission.For convenience it is assumed that macro UE A use layer 1 using layer 0 and macro UE B in MU-MIMO.It is also false
The signal of given layer 0 and 1 uses the CDM codes [w in two continuous DM RS RE respectively0,0w0,1] and [w1,0w1,1] extend.
It is also assumed that the DM RS Tx in the second time slot of subframe are disabled for UE A, and enabled for UE B.
With reference to figure 18, if data-signal Sk, 12 will be passed in OFDM symbol 12 at subcarrier k (k=1,6,11)
Defeated to arrive UE A, then eNB transmits the signal w in OFDM symbol 12 at subcarrier k0,0*Sk,12With in OFDM symbol 13 in son
Signal w at carrier wave k0,0*Sk,12,w0,1*Sk,12Extended version.In order to help UE A data detection signals, it to be used for OFDM symbol
12 and the direct link DM RS extended codes of OFDM symbol 13 undergo phase rotated appropriate so that the symbol phase of extended code exists
For 0 (for example, having used CDM codes [1w in OFDM symbol 120,1/w0,0])。
Therefore, UE A simply just abandon the DM RS RE in the last OFDM symbol of subframe and are carried out to PDSCH
Demodulation/decoding, it is contemplated that data-signal is also carried in the DM RS RE of the second last OFDM symbol of subframe.In addition,
After carrying out extension to the signal carried in the DM RS RE of the second time slot, UE A to PDSCH can demodulate/solve
Code.UE A use the DM RS of the first time slot, are demodulated for the PDSCH of first/second time slot.
In another method (not shown), eNB can transmit the data-signal at the subcarrier k in OFDM symbol 12
Different data-signal Sk at Sk, the 12 and subcarrier k in OFDM symbol 13,13.That is, the second time slot is every
A DM RS RE can be used for PDSCH transmission, without any constraint.In this case, UE A can execute PDSCH
Demodulation/decoding, it is contemplated that transmit data-signal in all DM RS RE of the second time slot.
Meanwhile UE B assume using the signal for UE B and MU-MIMO operation and transmitted in DM RS RE
Signal for UE A is extended using the code orthogonal with the DM RS of UE B, is data-signal but regardless of the signal for UE A
Or RS.Therefore, after the signal in the DM RS RE to the second time slot carries out extension, UE B execute channel estimation.
Above-mentioned operation applies also for the subframe with 12 OFDM symbols in the case of the CP of extension.Although existing
In second time slot of subframe, foregoing description is given in the context that DM RS Tx are enabled/disabled, but if for subframe
First time slot is provided with DM RS Tx and enables/disabling, and identical situation is also applied for the first time slot of subframe.It can also be according to pre-
Placing graphic pattern changes the time slot that DM RS Tx are applied to by signaling.For example, when DM RS Tx are disabled targeted
Gap can be by higher level signaling (for example, RRC signaling) or via the PDCCH distributed for DL (for example, being dispatched for PDSCH
PDCCH) indicate.
Figure 19 be suitable for the invention base station (BS), RN and UE block diagram.
With reference to figure 19, wireless communication system includes BS 110, RN 120 and UE 130.
BS 110 includes processor 112, memory 114 and RF units 116.It can be with configuration processor 112 to realize
The process and/or method of the present invention.Processor 114 is connected to processor 112 and stores related with the operation of processor 112
Each information.RF units 116 are connected to processor 112 and transfer and/or receive RF signals.Relay 120 includes
Processor 122, memory 124 and RF units 126.Process and/or the side of the present invention can be realized with configuration processor 122
Method.Processor 124 is connected to processor 122 and stores each information related with the operation of processor 122.RF units
126 are connected to processor 122 and transfer and/or receive RF signals.UE 130 include processor 132, memory 134 and
RF units 136.The process and/or method of the present invention can be realized with configuration processor 132.Processor 134 is connected everywhere
It manages device 132 and stores each information related with the operation of processor 132.RF units 136 be connected to processor 132 and
Transfer and/or receive RF signals.BS 110, relay 120 and/or UE 130 can have single or multiple antennas.
The embodiment of the present invention being described below is the combination of the elements and features of the present invention.Unless otherwise mentioned,
Otherwise element or feature are considered selective.Each element or feature can not with other elements or feature group
It is realized in the case of conjunction.In addition, the embodiment of the present invention can be constructed by the part of composite component and/or feature.It can be with
Rearrange the order of operation described in an embodiment of the present invention.Some constructions of any one embodiment can be included in
In another embodiment, and it can be replaced with the corresponding construction of another embodiment.It should be obvious to a one skilled in the art that
The claim quoted each other not yet explicitly in the following claims can it is as embodiment of the invention combination and exist,
Or as the subsequent correction after being submitted in the application new claim by by including.
In an embodiment of the present invention, centered on the data transmission and reception relationship between BS, relay and MS
It is made that description.In some cases, being described as the specific operation executed by BS can be executed by the upper node of BS.That is,
It is readily apparent that in the network being made of multiple network nodes including BS, for the various behaviour of the communication execution with MS
Work can be executed by BS or the network node other than BS.Term ' eNB ' can use term ' fixed station ', ' node B ',
The replacements such as ' base station (BS) ', ' access point '.Term ' UE ' can use term ' movement station (MS) ', ' mobile subscriber station (MSS) ',
Replacements such as ' mobile terminals '.
The embodiment of the present invention can such as hardware, firmware, software or combinations thereof be realized by various modes.In hardware
In configuration, method according to an embodiment of the invention can pass through one or more application-specific integrated circuits (ASIC), digital signal
Processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array
(FPGA), processor, controller, microcontroller, microprocessor etc. are realized.
In firmware or software configuration, the embodiment of the present invention can be realized in the form of module, process, function etc..Example
Such as, software code can be stored in memory cell, and be executed by processor.Memory cell is located at the interior of processor
Portion or outside, and processor can be transferred data to via various well-known modes and receive data from processor.
Those skilled in the art will be appreciated that, without departing substantially from the spirit and fundamental characteristics of the present invention, this
Invention can be realized with other ad hoc fashions other than those of set forth herein.Above-described embodiment is therefore in all sides
Face is interpreted illustrative and not restrictive.The scope of the present invention should by appended claims and they legal be equal
Object determines, rather than is determined by foregoing description, and falls into the equal purport of all changes of the meaning and full scope of equivalents of appended claims
It is being included in the present invention.
Industrial feasibility
The present invention relates to a kind of wireless communication systems.Specifically, the present invention is suitable for for passing through in a wireless communication system
The method and apparatus that signal is transmitted by relay backhaul link.
Claims (14)
1. a kind of method for receiving signal by relay in a wireless communication system, the method includes：
The reference signal in the subframe with the first time slot and the second time slot is received from base station by the relay,
Wherein, each in first time slot and the second time slot includes allowing to extend the more of the reference signal above
A continuous resource element, and most latter two orthogonal frequency division multiplexing of the multiple continuous resource element and corresponding time slot
OFDM symbol is overlapped, and
Wherein, if the last OFDM symbol of the subframe is not useable for the transmission from the base station to the relay,
The reference signal is then only received in first time slot of the subframe, and the multiple in second time slot
Data-signal is received at least part of continuous resource element.
2. according to the method described in claim 1, wherein, if the last OFDM symbol of the subframe can be used for from the base
It stands to the transmission of the relay, is then all received in both the first time slot of the subframe and the second time slot described with reference to letter
Number.
3. according to the method described in claim 1, wherein, the multiple continuous resource element is in first time slot and second
It is continuous on time in each in time slot.
4. according to the method described in claim 1, wherein, the multiple continuous resource element is in first time slot and
Two resource elements continuous in time in each in two time slots.
5. the multiple continuous in second time slot of the subframe according to the method described in claim 1, wherein
At least part of resource element corresponds to not last with the subframe among the multiple continuous resource element
The resource element of OFDM symbol overlapping.
6. according to the method described in claim 1, wherein, the reference signal is extended using orthogonal code.
7. according to the method described in claim 1, wherein, in second time slot of the subframe, the data-signal is sharp
It is extended with for extending orthogonal code used in the reference signal in the multiple continuous resource element.
8. a kind of relay in a wireless communication system, the relay include：
Radio frequency unit；And
Processor, the processor are operably connected to the RF units,
Wherein, the processor is configured as controlling the RF units from son of the base station reception with the first time slot and the second time slot
Reference signal in frame,
Wherein, each in first time slot and the second time slot includes allowing to extend the more of the reference signal above
A continuous resource element, and most latter two orthogonal frequency division multiplexing of the multiple continuous resource element and corresponding time slot
OFDM symbol is overlapped, and
Wherein, if the last OFDM symbol of the subframe is not useable for the transmission from the base station to the relay,
The reference signal is then only received in first time slot of the subframe, and the multiple in second time slot
Data-signal is received at least part of continuous resource element.
9. relay according to claim 8, wherein if the last OFDM symbol of the subframe can be used for from institute
Transmission of the base station to the relay is stated, then all receives the ginseng in both the first time slot of the subframe and the second time slot
Examine signal.
10. relay according to claim 8, wherein the multiple continuous resource element is in first time slot
It is continuous on the time in each in the second time slot.
11. relay according to claim 8, wherein the multiple continuous resource element is at described first
Two resource elements continuous in time in each in gap and the second time slot.
12. relay according to claim 8, wherein in second time slot of the subframe, the multiple company
At least part of continuous resource element corresponds to not last with the subframe among the multiple continuous resource element
OFDM symbol overlapping resource element.
13. relay according to claim 8, wherein extend the reference signal using orthogonal code.
14. relay according to claim 8, wherein in second time slot of the subframe, the data letter
It number is extended using for extending orthogonal code used in the reference signal in the multiple continuous resource element.
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| US29932310P | 2010-01-28 | 2010-01-28 | |
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| KR1020110008625A KR20110088458A (en) | 2010-01-28 | 2011-01-28 | Apparatus and method of transmitting a signal in relay backhaul link |
| CN201180006874.2A CN102714570B (en) | 2010-01-28 | 2011-01-28 | For the method and apparatus via relay backhaul link transmission signal |
| KR10-2011-0008625 | 2011-01-28 |
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