CN102082600A - Relay link downlink control information configuration method, transmission base station, relay station and method - Google Patents
Relay link downlink control information configuration method, transmission base station, relay station and method Download PDFInfo
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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Abstract
The invention provides a relay link downlink control information configuration method, a transmission base station, a relay station and a method. The transmission method comprises the following steps: the base station transmits a relay link physical downlink control channel on N1 continuously or discretely distributed control channel units while sending downlink control information to the relay station; each control channel unit comprises N2 resource unit groups, and each resource unit group comprises N3 effective resource units; or each control channel unit comprises N4 effective resource units. By adopting the technical scheme in the invention, the problem in sending the relay link physical downlink control information is solved; the structure of the relay link downlink physical resource is fully considered with respect to bearing of the relay link physical downlink control information described by the invention at the same time; the multiplexing and transmission flexibility of the relay link downlink control information is ensured; and the influence on terminals is avoided in the meantime.
Description
Technical field
The present invention relates to moving communicating field, in particular to a kind of repeated link Downlink Control Information collocation method and transmission base station, relay station and method.
Background technology
At present, the demand for development of mobile communication is to support higher transmission rate, more perfect signal to cover and higher resource utilization.In order to reach high transfer rate, next generation mobile communication system will adopt higher frequency bandwidth for transmission signal, and higher frequency bandwidth will be brought bigger path loss simultaneously, influence the network coverage.Relaying (Relay) technology can increase covering and balance and increase cell throughout, and via node (Relay Node is called for short RN) than the base station, has less relatively deployment cost, and therefore, relaying is regarded as 3GPP (3
RdGeneration Partnership Proiect, third generation partner program, abbreviation 3GPP) key technology in the evolution system-senior Long Term Evolution of Long Term Evolution (Long Term Evolution abbreviates LTE as) (LTE-Advanced the is called for short LTE-A) system.
The LTE/LTE-A system down link is the basis with OFDM (Orthogonal Frequency DivisionMultiplexing, OFDM) technology.In ofdm system, when the communication resource is-form of bidimensional frequently.For example, in the LTE system, the communication resource of down link is that unit divides with frame (frame) on time orientation, and each radio frames (radio frame) length is 10ms, the subframe (sub-frame) that to comprise 10 length be 1ms, as shown in Figure 1.Each subframe is divided into two time slots (slot) again at time orientation.According to the difference of CP (Cyclic Prefix, Cyclic Prefix are called for short CP) length, each subframe can comprise 14 or 12 OFDM symbols.When subframe adopts common CP (Normal CP) length, comprise 14 OFDM symbols in the subframe, each time slot has 7 OFDM symbols; When subframe adopts expansion CP (Extended CP) length, comprise 12 OFDM symbols in the subframe, each time slot has 6 OFDM symbols.In frequency direction, resource is that unit divides with subcarrier (sub-carrier), and specifically in communication, the least unit of resource allocation is RB (Resource Block, a Resource Block), a PRB (Physical RB, Physical Resource Block) of corresponding physical resource.A PRB comprises 12 subcarriers at frequency domain, at the corresponding time slot of time domain.Two adjacent RB of time domain are called RB to (RB pair) in the subframe.The resource of a corresponding subcarrier is called Resource Unit (Resource Element is called for short RE) on each OFDM symbol.A physical resource structural representation under the common CP length as shown in Figure 2.
Introduce after the relay station, be equivalent to the transmission of data many a jumping.With the double bounce system is example, the communication pattern of base station-terminal has originally become the communication pattern of base station-relay station-terminal, wherein base station-relay station link is called as repeated link (backhaul link), relay station-terminal links is called as access link (access link), and base station-terminal links is called as the link that direct transfers (direct link).In multihop system, a part of terminal is linked under the relay station, finishes communication service by relay station.Introduce after the relay station; need the backwards compatibility of assurance for terminal; the terminal of version is (such as LTERelease-8 before promptly guaranteeing; be called for short Rel-8) also can be linked under the relay station of LTE-A system; at this time just need under the prerequisite that does not influence the communication of relay station subordinate terminal, mark off a part of resource to guarantee the communication between base station and the relay station.Definite base station-relay station communication and relay station-terminal communication are carried out with time division way in the LTE-A system at present, and be concrete, marks off a part and be used for base station-relay station communication in descending sub frame, and these subframes are called as relaying (Relay) subframe.Rel-8 terminal for the relay station subordinate, the Relay subframe is indicated as MBSFN (Multicast Broadcast Single FrequencyNetwork, Multicast Broadcast Single Frequency Network, be called for short MBSFN) subframe, thereby the Rel-8 terminal can be skipped these subframes, when finishing base station-relay station communication, guaranteed backwards compatibility for the Rel-8 terminal.In the LTE-A system, the structure of Relay subframe as shown in Figure 3.
RN sends control information to subordinate terminal in preceding 1 or 2 OFDM symbol of Relay subframe, afterwards through associate transmit status to change-over time that accepting state is switched at interval, receive repeated link downlink data information from the base station.Because relay station does not receive PDCCH (the Physical DownlinkControl Channel that the base station sends, Physical Downlink Control Channel, be called for short PDCCH), so need redefine the transmission that a physical channel R-PDCCH (Relay-PDCCH, repeated link PDCCH) is used for the repeated link Downlink Control Information at repeated link.
In the LTE/LTE-A system, a PDCCH is one or the middle transmission of several continuous CCE (Control Channel Element, control channel unit are called for short CCE), and the interior CCE of subframe shines upon through carrying out resource after interweaving.The unit that CCE interweaves is REG (Resource Element Group, resource unit group are called for short REG), comprises 4 effective RE among each REG.Here effectively be meant the RE number that is used to transmit PDCCH among each REG.The main effect that interweaves is the randomization of disturbing between frequency diversity and the sub-district.The order of resource mapping is the section start from sub-carrier indices and OFDM notation index, shines upon with the order of frequency direction behind the first time orientation in the PDCCH territory.
The transfer resource of R-PDCCH is positioned at the business domains of Rel-8 system, so the new demodulated reference signal of discussing among the LTE-A may be positioned at the R-PDCCH territory; Be different from PDCCH, R-PDCCH may only transmit in the RB of downlink portion bandwidth; Than the link that direct transfers, the repeated link channel conditions may be relatively good, so the data of R-PDCCH may support to be different from modulation system and the code check of PDCCH.For above-mentioned reasons, cause the design of R-PDCCH and design and the transmission method that PDCCH possibly can't be directly continued to use in transmission.
At present in the discussion of 3GPP LTE-A correlation technique, the discussion about the detailed problem of R-PDCCH as CCE, REG etc., does not still fully launch.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of repeated link Downlink Control Information collocation method and transmission base station, relay station and method, has solved the transmission problem of repeated link physical down control information.
In order to address the above problem, the invention provides a kind of transmission method of repeated link Downlink Control Information, described method comprises:
When the base station sent Downlink Control Information to relay station, a transmission repeated link Physical Downlink Control Channel (R-PDCCH) was gone up in control channel unit (CCE) continuous at N1 or discrete distribution;
Each described CCE comprises N2 resource unit group, and each resource unit group comprises N3 efficient resource unit; Perhaps, each described CCE comprises N4 efficient resource unit.
Further, the value of described N1 for set 1,2,4, any 1 number among the 8}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1, any 1 number among the 2}; Perhaps,
The value of described N1 for set 1,2,3, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 3}.
Further, the value of described N2 is 6 or 7 or 8 or 9;
The value of described N3 is 4.
Further, the value of described N2 is 6 or 8 or 9 or 10 or 12;
The value of described N3 is 3.
Further, distribute n continuous OFDM (OFDM) symbol to be used to transmit described R-PDCCH in the resource block pair that is used for described R-PDCCH transmission, the value of described N4 is the number of the Resource Unit after a Resource Block is internally removed reference signal in described n the OFDM symbol.
Further, the value of described N4 is 18 or 24 or 36.
Further, all CCE that are used to transmit each R-PDCCH in the subframe with REG be interleave unit through carrying out the resource mapping after interweaving, described resource is the physical resource that is used for the R-PDCCH transmission in the subframe; Perhaps, the CCE that is used to transmit same R-PDCCH with REG be interleave unit through carrying out the resource mapping after interweaving, described resource is the physical resource that is distributed for this R-PDCCH transmission.
Further, the CCE that is used to transmit described R-PDCCH in the subframe does not interweave and carries out the resource mapping, and described resource is to be used for the physical resource that the R-PDCCH transmission is distributed.
Further, the unit of described resource mapping is resource unit group or Resource Unit;
The order of described resource mapping is a frequency direction behind the first time orientation, perhaps is time orientation after the first frequency direction.
The present invention also provides a kind of collocation method of repeated link Downlink Control Information, comprising:
N2 resource unit group of control channel unit (CCE) configuration for each repeated link; Be 3 of each Resource Unit configuration set or 4 efficient resource unit.
Further, each resource unit group comprises that the value of 4 efficient resource unit and described N2 is 6 or 7 or 8 or 9; Perhaps,
Each resource unit group comprises that the value of 3 efficient resource unit and described N2 is 6 or 8 or 9 or 10 or 12.
The present invention also provides a kind of collocation method of repeated link Downlink Control Information, comprising:
Distribute n continuous OFDM (OFDM) symbol to be used to transmit described R-PDCCH in the resource block pair that is used for repeated link Physical Downlink Control Channel (R-PDCCH) transmission, each R-PDCCH transmits in 1 or a plurality of CCE, each CCE comprises N4 efficient resource unit, and described N4 is the number of the Resource Unit after a Resource Block is internally removed reference signal in n the OFDM symbol.
The present invention also provides a kind of base station of transmission trunking link Downlink Control Information, comprises configuration module and sending module;
Described configuration module is used to dispose N1 control channel unit (CCE) continuous or discrete distribution and transmits each repeated link Physical Downlink Control Channel (R-PDCCH);
Each described CCE comprises N2 resource unit group, and each described resource unit group comprises N3 efficient resource unit, or each described CCE comprises N4 efficient resource unit;
Described sending module is used for sending described R-PDCCH on described CCE.
Further, the value of described N1 for set 1,2,4, any 1 number among the 8}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1, any 1 number among the 2}; Perhaps,
The value of described N1 for set 1,2,3, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 3}.
Further, the value of described N3 is 4, and the value of described N2 is 6 or 7 or 8 or 9; Perhaps,
The value of described N3 is 3, and the value of described N2 is 6 or 8 or 9 or 10 or 12.
Further, described configuration module also is used for distributing n continuous OFDM (OFDM) symbol to be used to transmit described R-PDCCH in the resource block pair of described R-PDCCH transmission, and the value of described N4 is the number of the Resource Unit after a Resource Block is internally removed reference signal in described n the OFDM symbol; Perhaps,
The value of described N4 is 18 or 24 or 36.
Further, described base station also comprises interleaving block, and being used for all CCE that transmit each R-PDCCH is that interleave unit interweaves with REG; Perhaps, being used for the CCE that transmits same R-PDCCH is that interleave unit interweaves with REG.
Further, described base station also comprises mapping block, is used for described R-PDCCH is carried out the resource mapping, and the unit of described resource mapping is resource unit group or Resource Unit;
The order of described resource mapping is a frequency direction behind the first time orientation, perhaps is time orientation after the first frequency direction.
A kind of relay station of transmission trunking link Downlink Control Information comprises receiver module:
Described receiver module is used to receive the repeated link Downlink Control Information, and described repeated link Downlink Control Information is carried on repeated link Physical Downlink Control Channel R-PDCCH;
Described R-PDCCH goes up transmission in control channel unit (CCE) continuous at N1 or discrete distribution;
Described each CCE comprises N2 resource unit group, and each resource unit group comprises N3 efficient resource unit; Perhaps,
Each CCE comprises N4 efficient resource unit.
In sum, the invention provides a kind of repeated link Downlink Control Information collocation method and transmission base station, relay station and method, solved the transmission problem of repeated link physical down control information, the carrying of the repeated link physical down control information that the present invention simultaneously describes has taken into full account the structure of repeated link downlink physical resource, guaranteed the flexibility that the repeated link Downlink Control Information is multiplexing and transmit, avoided influence simultaneously for terminal.
Description of drawings
Fig. 1 is the frame structure schematic diagram of LTE/LTE-A system;
Fig. 2 is the physical resource structural representation of LTE/LTE-A system;
Fig. 3 is a Relay subframe structure schematic diagram;
Fig. 4 is an architecture of base station schematic diagram of the present invention;
Fig. 5 a to Fig. 5 e is the repeated link REG schematic diagram of the embodiment of the invention 1;
Fig. 6 is the repeated link CCE schematic diagram of the embodiment of the invention 2;
Fig. 7 is the repeated link CCE schematic diagram of the embodiment of the invention 2;
Fig. 8 is the repeated link CCE schematic diagram of the embodiment of the invention 2;
Fig. 9 a to Fig. 9 c is the repeated link REG schematic diagram of the embodiment of the invention 3.
Embodiment
In the discussion of present 3GPP LTE-A correlation technique, the detailed problem that transmits about the repeated link Physical Downlink Control Channel does not also have sufficient discussion.Embodiments of the invention provide the method for the transmission and the respective channel design of the control information of repeated link physical down.
The invention provides a kind of base station of transmission trunking link Downlink Control Information, as shown in Figure 4, this base station comprises configuration module, mapping block and sending module, and this base station can also comprise interleaving block;
Configuration module is used to dispose N1 CCE and transmits each R-PDCCH;
Each CCE comprises N2 REG, and each REG comprises N3 RE, or each CCE comprises N4 effectively RE;
Sending module is used for sending R-PDCCH on CCE.
The value of N1 can be defined as set 1,2,4, any 1 number among the 8}; Perhaps for set 1,2, any 1 number among the 4}; Perhaps for set 1, any 1 number among the 2}; Perhaps for set 1,2,3, any 1 number among the 4}; Perhaps for set 1,2, any 1 number among the 3}.
The value of above-mentioned N3 is 4, and the value of N2 is 6 or 7 or 8 or 9 at this moment;
The value of above-mentioned N3 is 3, and the value of N2 is 6 or 8 or 9 or 10 or 12 at this moment.
Configuration module also is used for distributing n continuous OFDM symbol to be used to transmit R-PDCCH each RB centering, the value of N4 in this n the OFDM symbol in the number of a RB to interior RE after removing reference signal; Perhaps the value of N4 is fixed as 18,24 or 36.
Interleaving block, can be used for all CCE that transmit each R-PDCCH is that interleave unit interweaves with REG; Perhaps, being used for the CCE that transmits same R-PDCCH is that interleave unit interweaves with REG.
Mapping block is used for carry out the resource mapping for the resource that R-PDCCH distributed, and the unit of resource mapping can be REG or RE;
The order of resource mapping can be frequency direction behind the first time orientation, also can be time orientation after the first frequency direction.
When the base station does not comprise interleaving block, can directly carry out the resource mapping.
The present invention also provides a kind of relay station of transmission trunking link Downlink Control Information, comprises receiver module;
Receiver module is used to receive the repeated link Downlink Control Information, and the repeated link Downlink Control Information is carried on repeated link Physical Downlink Control Channel R-PDCCH;
R-PDCCH CCE (control channel unit) continuous at N1 or discrete distribution goes up transmission;
Each CCE comprises N2 resource unit group, and each resource unit group comprises N3 efficient resource unit; Perhaps each CCE comprises N4 efficient resource unit.
The present invention also provides a kind of collocation method of repeated link Downlink Control Information,
Method (a):
N2 resource unit group of each CCE configuration for repeated link; Be 3 of each Resource Unit configuration set or 4 efficient resource unit.
Each resource unit group comprises that the value of 4 efficient resource unit and N2 is 6 or 7 or 8 or 9; Perhaps,
Each resource unit group comprises that the value of 3 efficient resource unit and N2 is 6 or 8 or 9 or 10 or 12.
Method (b):
Distribute n continuous OFDM symbol to be used to transmit described R-PDCCH in the resource block pair that is used for the R-PDCCH transmission, each R-PDCCH transmits in 1 or a plurality of CCE, each CCE comprises N4 efficient resource unit, and N4 is the number of the Resource Unit after a Resource Block is internally removed reference signal in n the OFDM symbol.
The present invention also provides a kind of transmission method of repeated link Downlink Control Information, and transmit for N1 CCE continuous or discrete distribution of each R-PDCCH configuration the base station, and wherein each CCE comprises N2 REG, and each resource unit group comprises N3 effectively RE; Perhaps, each CCE comprises N4 effectively RE.
The repeated link physical down control information that the present invention describes can be transmitted after interweaving.Interweaving can be all to interweave, promptly adopt with LTE in the PDCCH identical processing mode that interweaves, the CCE that is used to transmit R-PDCCH in the subframe is that interleave unit interweaves with REG; Or partly interweave, the CCE that promptly transmits some R-PDCCH is that interleave unit interweaves with REG.Carry out the resource mapping after interweaving, the order of resource mapping can be a frequency direction behind the first time orientation, time orientation after the perhaps first frequency direction.
The repeated link physical down control information that the present invention describes can not interweave yet, each R-PDCCH carries out the resource mapping in the resource that it takies, the unit of resource mapping is REG or RE, the order of resource mapping can be a time orientation after the first frequency direction, frequency direction behind the perhaps first time orientation.
Below by specific embodiment the inventive method is elaborated.
It has been generally acknowledged that than the link that direct transfers, the channel conditions of repeated link is relatively good, so the transmission of repeated link Downlink Control Information may reduce resource overhead on the basis of link that direct transfers and can not cause transmission performances to descend.The mode of general reduction resource overhead has uses the more constellation modulation system of high-order, perhaps increases the code check of transmission etc.The mode that changes the general through-rate coupling of mode (ratematching) of code check is finished.
For example, consider that the repeated link channel conditions is relatively good, thereby adopt the mode of high order modulation to reduce the purpose of controlling signaling consumption to reach.In LTE, PDCCH adopts the mode of quarternary phase-shift keying (QPSK) (QPSK) to modulate; And, can adopt the mode of 16 rank quadrature amplitude modulation (16QAM) even 64QAM modulation for R-PDCCH.After improving order of modulation, and then the size that can reduce repeated link CCE reaches the purpose that reduces resource overhead.On the other hand, because the repeated link resource is more limited, littler CCE can be so that more flexible when being the R-PDCCH Resources allocation.
Based on above reason, the principle of CCE design is in this example, each CCE comprises N2 REG, each REG comprises N3 effectively RE, can keep the size of REG identical with the REG size of LTE PDCCH, promptly each REG has 6 or 4 RE, and 6 RE are corresponding in the RB, have 4 RE to be used for the situation of reference signal transmission in the OFDM symbol at most, 4 RE are corresponding to the situation that does not have reference signal transmission in the OFDM symbol; Keep effective size of REG effectively big or small identical with the REG of LTE PDCCH, promptly effectively size is 4RE/REG (N3 is 4 among each REG); Described the structure of REG in this example as shown in Figure 4, wherein Fig. 5 a represents not have in the OFDM symbol REG example of reference signal, and Fig. 5 b, Fig. 5 c, Fig. 5 d and Fig. 5 e have described the REG schematic diagram when having different reference signal pattern in the OFDM symbol.
The value of N2 can be 6 or 7 or 8 or 9; If for reducing resource overhead, the number that the REG that each CCE comprises can be set is less than 9 REG that define among the LTE PDCCH, the CCE size that is repeated link can be defined as 6 REG, the number of the RE that a corresponding CCE comprises is 24, perhaps the CCE size can be defined as 7 REG, the number of the RE that a corresponding CCE comprises is 28, and perhaps the CCE size can be defined as 8 REG, and the number of the RE that a corresponding CCE comprises is 32.
In the present embodiment, the number N1 that is used for transmitting the CCE of each R-PDCCH can be defined as be set 1,2,4, any 1 number of 8}, or set 1,2, any 1 number among the 4}, or set 1, any 1 number among the 2}, or set 1,2,3, any 1 number among the 4}, or set 1,2, any 1 number among the 3}; For different CCE numbers, can fill up the CCE that R-PDCCH takies to guarantee the modulation symbol number after the constellation modulation by the mode of the data after the chnnel coding being carried out rate-matched.The mode of concrete rate-matched can be identical with the rate-matched mode of LTEPDCCH, repeats no more here.
Data among the R-PDCCH can be carried out the resource mapping after interweaving.Interleaving mode can be interleave unit with REG, can be that all R-PDCCH of transmission in the subframe interweave together, and all CCE that promptly are used for the R-PDCCH transmission in the subframe are that interleave unit interweaves together with REG; Interleaving mode can also be that a R-PDCCH inside interweaves, and the CCE that promptly transmits some R-PDCCH is that interleave unit interweaves with REG.Concrete deinterleaving method can adopt the identical deinterleaving method that interweaves with LTE PDCCH, repeats no more here.If all R-PDCCH of transmission interweave together in the subframe, being used to transmit the subcarrier in frequency domain and the time domain OFDM symbol section start of the physical resource of R-PDCCH after interweaving in subframe, is that unit adopts behind the first time orientation order of frequency direction to carry out the resource mapping with REG; If the CCE in R-PDCCH interweaves, at the subcarrier in frequency domain and the time domain OFDM symbol section start of the physical resource that is used to transmit this R-PDCCH, be that unit adopts behind the first time orientation order of frequency direction to carry out the resource mapping with REG after interweaving.Specifically shine upon the definite identical of time institute's mapping physical resource sequence, repeat no more here with LTE PDCCH in resource.
The resource mapping of R-PDCCH also can be a time orientation after the first frequency direction.Concrete, if all R-PDCCH of transmission interweave together in the subframe, in subframe, be used to transmit the subcarrier in frequency domain and the time domain OFDM symbol section start of the physical resource of R-PDCCH after interweaving, at first in the OFDM symbol, section start from the frequency domain resource that is used for R-PDCCH transmission, shine upon according to sub-carrier indices order from small to large, after the physical resource that is used for the R-PDCCH transmission in this OFDM symbol shines upon and finishes, then the frequency domain resource section start that is used for the R-PDCCH transmission in the next OFDM symbol according to the time domain OFDM notation index shines upon, and the resource mapping in the OFDM symbol of being useful on R-PDCCH transmission is all finished.If the interior CCE of R-PDCCH interweaves, the situation that all R-PDCCH interweave in the resource mapping order of time orientation and the subframe after elder generation's frequency direction is identical, just at this moment the physical resource of mapping includes only the resource that is used for this R-PDCCH transmission, repeats no more here.
On the link CCE size basis that direct transfers, reduce the size of repeated link CCE, can under the prerequisite that guarantees repeated link Downlink Control Information transmission performance, pare down expenses, make that the resource allocation of repeated link is more flexible, effectively avoided the waste of resource.
For relay station, the resource that R-PDCCH takies may be different from PDCCH, and promptly R-PDCCH is positioned at the business domains of LTE Rel-8, and R-PDCCH may only can take a part of RB at frequency domain.Present embodiment provides the method for the CCE and the transmission R-PDCCH of another configuration repeated link.
Concrete, distribute n continuous OFDM symbol to be used to transmit a R-PDCCH a RB centering, this moment N4 value in this n the OFDM symbol in the number of a RB to interior RE after removing reference signal; Above-mentioned reference signal includes but not limited to public reference signal and demodulated reference signal.
For example, suppose that subframe has common CP length, and hypothesis R-PDCCH takies the 4th, 5,6,7 OFDM symbol of the 1st time slot in the relay sub-frame, remove outside the reference signal so, the available resources in each RB centering R-PDCCH territory have 32 RE, thereby the big or small N4 of CCE is 32 RE, shown in the dash area among Fig. 6.
And for example, suppose that subframe has expansion CP length, and hypothesis R-PDCCH takies the 4th, 5,6 OFDM symbol of the 1st time slot in the relay sub-frame, as shown in Figure 7, remove outside 20 reference signals, the available resources in each RB centering R-PDCCH territory have 16 RE, thereby the big or small N4 of CCE is 16 RE; As shown in Figure 8, have 16 reference signals in the 4th, 5,6 the OFDM symbol, so the big or small N4 of CCE is 20 RE.
In this example, the size of repeated link CCE also can be set to fixed value, and the principle of setting is the reliability that 1 CCE can guarantee the transmission of part repeated link Physical Downlink Control Channel.For example set a CCE and comprise 18 Resource Unit RE, perhaps set a CCE and comprise 24 Resource Unit RE, perhaps set a CCE and comprise 36 Resource Unit RE, or the like.
In the present embodiment, the CCE number that is used for transmitting each R-PDCCH can be defined as be set 1,2,4, any 1 number of 8}, or set 1,2, any 1 number among the 4}, or set 1, any 1 number among the 2}, or set 1,2,3, any 1 number among the 4}, or set 1,2, any 1 number among the 3}; For different CCE numbers, can fill up the CCE that R-PDCCH takies to guarantee the modulation symbol number after the constellation modulation by the mode of the data after the chnnel coding being carried out rate-matched.The mode of concrete rate-matched can be identical with the rate-matched mode of LTE PDCCH, repeats no more here.
Can not interweave after the R-PDCCH transfer resource is determined and directly carry out resource and shine upon.Method for mapping resource can be a time orientation after the first frequency direction.Concrete, subcarrier in frequency domain and time domain OFDM symbol section start at the physical resource that is used for a certain R-PDCCH transmission, at first in the OFDM symbol, section start from the frequency domain resource that is used for this R-PDCCH transmission, shine upon according to sub-carrier indices order from small to large, after the physical resource that is used for this R-PDCCH transmission in this OFDM symbol shines upon and finishes, then the frequency domain resource section start that is used for this R-PDCCH transmission in the next OFDM symbol according to the time domain OFDM notation index shines upon, and the resource mapping in the OFDM symbol of this R-PDCCH transmission of be useful on is all finished.The unit of resource mapping can be Resource Unit RE, also can be resource unit group REG.
The data of R-PDCCH are carried out the order that the resource mapping time also can be adopted frequency direction behind the first time orientation.Concrete, subcarrier in frequency domain and time domain OFDM symbol section start at the physical resource that is used for the R-PDCCH transmission, be that unit adopts behind the first time orientation order of frequency direction to carry out the resource mapping with REG, it is identical with LTE PDCCH specifically to shine upon definite method of time institute's mapping physical resource sequence in resource, repeats no more here.
Adopt the method for designing of CCE size in the present embodiment, can fully guarantee the utilization of repeated link resources effective, guarantee that R-PDCCH takies the flexibility of resource allocation.
Because R-PDCCH takies resource and is different from PDCCH, present embodiment provides the method for the CCE and the transmission R-PDCCH of another configuration repeated link.
In this example, each CCE of configuration comprises N2 REG, and each REG of configuration comprises 3 effective RE, and promptly N3 is 3.The definition example of a REG under the common CP length as shown in Figure 9.In Fig. 9, Fig. 9 a, Fig. 9 b and Fig. 9 c represent respectively that successively the OFDM symbol that does not have to have 4 RE to be used for the REG form of reference signal, a PRB in the OFDM symbol of the REG form of reference signal, a PRB in the OFDM symbol of a PRB has 6 RE to be used for the REG form of reference signal.When not having reference signal in the OFDM symbol, comprise 4 REG in the OFDM symbol; When having 4 RE to be used for reference signal in the OFDM symbol, remain the transmission that 8 RE can be used for R-PDCCH, at this moment the OFDM symbol comprises 2 REG in a RB, vacant 1 RE among each REG; When having 6 RE to be used for reference signal in the OFDM symbol, remain the transmission that 6 RE can be used for R-PDCCH, just in time can form 2 REG.REG in this example is can not stride PRB as the REG of LTE PDCCH, and each RE that promptly forms same REG all is positioned at same PRB.
For the purpose of explaining conveniently, the REG size definition in this example is two kinds of forms: comprise 3 RE among each REG, corresponding to the situation that does not have reference signal in the OFDM symbol; Comprise 6 RE among each REG, corresponding to the situation that reference signal is arranged in the OFDM symbol.But the effective RE number among each REG all is 3.As shown in Figure 9.
The value of N2 can be 6 in this example, comprise 18 RE corresponding to a CCE, the value of N2 also can be 8, comprise 24 RE corresponding to a CCE, the value of N2 also can be 9, comprises 27 RE corresponding to a CCE, the value of N2 also can be 10, comprise 30 RE corresponding to a CCE, the value of N2 also can be 12, comprises 36 RE corresponding to a CCE.
In the present embodiment, the CCE number that is used for transmitting each R-PDCCH can be set 1,2,4, any 1 number of 8}, or set 1,2, any 1 number among the 4}, or set 1, any 1 number among the 2}, or set 1,2,3, any 1 number among the 4}, or set 1,2, any 1 number among the 3}; For different CCE numbers, can fill up the CCE that R-PDCCH takies to guarantee the modulation symbol number after the constellation modulation by the mode of the data after the repeated link Downlink Control Information chnnel coding being carried out rate-matched.The mode of concrete rate-matched can be identical with the rate-matched mode of LTE PDCCH, repeats no more here.
In the present embodiment, the CCE of transmission R-PDCCH can carry out the resource mapping after interweaving.For example, interweaving with REG is interleave unit, and all CCE that are used to transmit R-PDCCH in the subframe are interweaved together, after interweaving be with REG unit with first time orientation after the order of frequency direction in subframe, the resource of transmission R-PDCCH is carried out the resource mapping; Perhaps each CCE in the R-PDCCH is interweaved, each CCE that promptly transmits same R-PDCCH is that interleave unit interweaves with REG, after interweaving be with REG unit with first time orientation after the order of frequency direction in subframe, transmit and carries out resource in the resource of this R-PDCCH and shine upon.Concrete deinterleaving method can adopt the identical method that interweaves with LTE PDCCH, repeats no more here.Identical among the mapping method of frequency direction and the LTE behind the concrete first time orientation, just change the size of REG and shone upon the frequency domain of resource and the scope of time domain.The REG tlv triple sequence table that for example is about to carry out the resource mapping is shown w
(p)(0) ..., w
(p)(M-1), promptly an element in this sequence is represented a REG, includes three constellation modulation symbols, always total M REG.The concrete example of a resource mapping is as shown in table 1 so.
R-PDCCH resource Mapping Examples among table 1: the embodiment 3
| 1) initialization m '=0; 2) initialization k '=K
Start3) initialization l '=L
Start4) if Resource Unit (k ', l ') is represented a REG who distributes to R-PDCCH, execution in |
| 9) k '=k '+1; 10) if k '＜K End, so from 3) repeat. |
In table 1,0≤m '≤M-1 represents the index of REG group, if a R-PDCCH interweaves, M represents the REG number that a R-PDCCH takies; If the R-PDCCH in the subframe interweaves, M represents the REG number that all R-PDCCH take in the subframe.K
Start≤ k '≤K
EndExpression subcarrier in frequency domain index is if a R-PDCCH interweaves K
StartBe the initial subcarrier number of this R-PDCCH at frequency domain, K
EndBe the end subcarrier number of this R-PDCCH at frequency domain; If the R-PDCCH in the subframe interweaves K
StartBe the initial subcarrier number of the interior R-PDCCH territory of this subframe at frequency domain, K
EndBe the end subcarrier number of the interior R-PDCCH of this subframe at frequency domain.L
Start≤ l '≤L
EndExpression time domain OFDM notation index, L
StartBe the initial OFDM symbol number of R-PDCCH, L
EndIt is the end OFDM symbol number of R-PDCCH.P in the table 1 represents the antenna port numbering of R-PDCCH transmission, and promptly R-PDCCH can fail by multi-antenna transmitting.Resource Unit in the step 4) (k ', l ') represent a REG who distributes to R-PDCCH to be meant, should (k ', l ') be the initial RE of REG, promptly form the RE of each RE frequency domain index minimum of this REG.The REG size here is an actual size, and promptly REG comprises 3 or 6 RE.
The resource mapping of R-PDCCH also can be a time orientation after the first frequency direction.Concrete, if all R-PDCCH of transmission interweave together in the subframe, the subcarrier in frequency domain and the time domain OFDM symbol section start of the physical resource that R-PDCCH transmits in being used for subframe after interweaving, at first in the OFDM symbol, section start from the frequency domain resource that is used for R-PDCCH transmission, shine upon according to sub-carrier indices order from small to large, after the physical resource that is used for the R-PDCCH transmission in this OFDM symbol shines upon and finishes, then the frequency domain resource section start that is used for the R-PDCCH transmission in the next OFDM symbol according to the time domain OFDM notation index shines upon, and all finishes up to the resource mapping of the OFDM symbol of being useful on R-PDCCH transmission.If interweave in a R-PDCCH, the situation that all R-PDCCH interweave in the resource mapping order of time orientation and the subframe after elder generation's frequency direction is identical, just at this moment the physical resource of mapping includes only the resource that is used for this R-PDCCH transmission, repeats no more here.
The design of CCE and REG has taken into full account the structure of repeated link physical resource in the present embodiment, has effectively avoided the waste of repeated link physical resource.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1. the transmission method of a repeated link Downlink Control Information is characterized in that, described method comprises:
When the base station sent Downlink Control Information to relay station, a transmission repeated link Physical Downlink Control Channel (R-PDCCH) was gone up in control channel unit (CCE) continuous at N1 or discrete distribution;
Each described CCE comprises N2 resource unit group, and each resource unit group comprises N3 efficient resource unit; Perhaps, each described CCE comprises N4 efficient resource unit.
2. the method for claim 1 is characterized in that:
The value of described N1 for set 1,2,4, any 1 number among the 8}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1, any 1 number among the 2}; Perhaps,
The value of described N1 for set 1,2,3, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 3}.
3. the method for claim 1 is characterized in that:
The value of described N2 is 6 or 7 or 8 or 9;
The value of described N3 is 4.
4. the method for claim 1 is characterized in that:
The value of described N2 is 6 or 8 or 9 or 10 or 12;
The value of described N3 is 3.
5. the method for claim 1 is characterized in that:
Distribute n continuous OFDM (OFDM) symbol to be used to transmit described R-PDCCH in the resource block pair that is used for described R-PDCCH transmission, the value of described N4 is the number of the Resource Unit after a Resource Block is internally removed reference signal in described n the OFDM symbol.
6. the method for claim 1 is characterized in that:
The value of described N4 is 18 or 24 or 36.
7. the method for claim 1 is characterized in that:
All CCE that are used to transmit each R-PDCCH in the subframe with REG be interleave unit through carrying out the resource mapping after interweaving, described resource is the physical resource that is used for the R-PDCCH transmission in the subframe; Perhaps, the CCE that is used to transmit same R-PDCCH with REG be interleave unit through carrying out the resource mapping after interweaving, described resource is the physical resource that is distributed for this R-PDCCH transmission.
8. the method for claim 1 is characterized in that:
The CCE that is used to transmit described R-PDCCH in the subframe does not interweave and carries out the resource mapping, and described resource is to be used for the physical resource that the R-PDCCH transmission is distributed.
9. as claim 7 or 8 described methods, it is characterized in that:
The unit of described resource mapping is resource unit group or Resource Unit;
The order of described resource mapping is a frequency direction behind the first time orientation, perhaps is time orientation after the first frequency direction.
10. the collocation method of a repeated link Downlink Control Information comprises:
N2 resource unit group of control channel unit (CCE) configuration for each repeated link; Be 3 of each Resource Unit configuration set or 4 efficient resource unit.
11. method as claimed in claim 10 is characterized in that:
Each resource unit group comprises that the value of 4 efficient resource unit and described N2 is 6 or 7 or 8 or 9; Perhaps,
Each resource unit group comprises that the value of 3 efficient resource unit and described N2 is 6 or 8 or 9 or 10 or 12.
12. the collocation method of a repeated link Downlink Control Information comprises:
Distribute n continuous OFDM (OFDM) symbol to be used to transmit described R-PDCCH in the resource block pair that is used for repeated link Physical Downlink Control Channel (R-PDCCH) transmission, each R-PDCCH transmits in 1 or a plurality of CCE, each CCE comprises N4 efficient resource unit, and described N4 is the number of the Resource Unit after a Resource Block is internally removed reference signal in n the OFDM symbol.
13. the base station of a transmission trunking link Downlink Control Information comprises configuration module and sending module; It is characterized in that:
Described configuration module is used to dispose N1 control channel unit (CCE) continuous or discrete distribution and transmits each repeated link Physical Downlink Control Channel (R-PDCCH);
Each described CCE comprises N2 resource unit group, and each described resource unit group comprises N3 efficient resource unit, or each described CCE comprises N4 efficient resource unit;
Described sending module is used for sending described R-PDCCH on described CCE.
14. base station as claimed in claim 13 is characterized in that:
The value of described N1 for set 1,2,4, any 1 number among the 8}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1, any 1 number among the 2}; Perhaps,
The value of described N1 for set 1,2,3, any 1 number among the 4}; Perhaps,
The value of described N1 for set 1,2, any 1 number among the 3}.
15. base station as claimed in claim 13 is characterized in that:
The value of described N3 is 4, and the value of described N2 is 6 or 7 or 8 or 9; Perhaps,
The value of described N3 is 3, and the value of described N2 is 6 or 8 or 9 or 10 or 12.
16. base station as claimed in claim 13 is characterized in that:
Described configuration module also is used for distributing n continuous OFDM (OFDM) symbol to be used to transmit described R-PDCCH in the resource block pair of described R-PDCCH transmission, and the value of described N4 is the number of the Resource Unit after a Resource Block is internally removed reference signal in described n the OFDM symbol; Perhaps,
The value of described N4 is 18 or 24 or 36.
17. base station as claimed in claim 13 is characterized in that:
Described base station also comprises interleaving block, and being used for all CCE that transmit each R-PDCCH is that interleave unit interweaves with REG; Perhaps, being used for the CCE that transmits same R-PDCCH is that interleave unit interweaves with REG.
18. base station as claimed in claim 13 is characterized in that:
Described base station also comprises mapping block, is used for described R-PDCCH is carried out the resource mapping, and the unit of described resource mapping is resource unit group or Resource Unit;
The order of described resource mapping is a frequency direction behind the first time orientation, perhaps is time orientation after the first frequency direction.
19. the relay station of a transmission trunking link Downlink Control Information comprises receiver module, it is characterized in that:
Described receiver module is used to receive the repeated link Downlink Control Information, and described repeated link Downlink Control Information is carried on repeated link Physical Downlink Control Channel R-PDCCH;
Described R-PDCCH goes up transmission in control channel unit (CCE) continuous at N1 or discrete distribution;
Described each CCE comprises N2 resource unit group, and each resource unit group comprises N3 efficient resource unit; Perhaps,
Each CCE comprises N4 efficient resource unit.
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| PCT/CN2010/079333 WO2011066793A1 (en) | 2009-12-01 | 2010-12-01 | Method, base station and relay station for transmitting relay downlink control information, and resource mapping method thereof |
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