CN101605375B - Method for sending signalings on downlink control channel - Google Patents
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- 230000011664 signaling Effects 0.000 title claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 87
- 230000008520 organization Effects 0.000 claims description 15
- 239000011159 matrix material Substances 0.000 claims description 12
- 238000013468 resource allocation Methods 0.000 claims description 12
- 238000012217 deletion Methods 0.000 claims description 4
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- 238000007493 shaping process Methods 0.000 abstract 1
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- 230000006835 compression Effects 0.000 description 9
- 238000007906 compression Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
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Abstract
The invention discloses a method for sending signalings on a downlink control channel. The method comprises the following steps: when downlink dispatching is carried out in a multithread beam-shaping BF (Band Filter) transmission mode, a substation on the physical downlink control channel (PDCCH) organizes and sends signalings in a special downlink control information (DCI) format of the preset BF transmission mode. The invention can be used to save system sources in the multithread BF transmission mode.
Description
Technical field
The present invention relates to the signaling transmission technology in the mobile communication system, the signaling method on particularly a kind of down control channel (PDCCH).
Background technology
In the LTE system, down control channel is PDCCH, is used for down link control informations (DCI) such as bearing downlink dispatch, uplink scheduling signaling and power control signaling, with the distribution and the power control of indication up-downgoing resource.The LTE standard has been determined the PDCCH of multiple DCI form at present, the information bit difference of various forms, and the concrete signaling information that comprises is also different.
During the transmission of signaling on carrying out PDCCH, at first in existing DCI form, selects a kind ofly, then user terminal (UE) is organized and sent to signaling with the DCI form of selection according to application scenarios.
At present, the different DCI forms that defined at single antenna port and MIMO pattern are as shown in table 1.
| DCI form (DCI format) | Effect | Size? |
| DCI the 0th form (DCI format 0) | Be used for uplink scheduling, the resource allocation and the transformat of indication UL-SCH channel | Size?1? |
| DCI the 1st form (DCI format 1) | The descending scheduling that is used for the single antenna port | Size?3? |
| DCI 1A form (DCI format 1A) | The descending scheduling of the single antenna port that is used to compress | Size?1? |
| DCI 1B form (DCI format 1B) | The descending scheduling of single antenna port that is used for the compression of closed loop | Size?2? |
| DCI 1C form (DCI format 1C) | Be used to support paging, RACH response and dynamic dispatching BCCH | Size?0? |
| DCI the 2nd form (DCI format 2) | The descending scheduling that is used for downlink closed-loop MIMO is supported the dicode word | Size?4? |
| DCI the 3rd form (DCI format 3) | Be used to send TPC order (2bit adjustment) | Size?1? |
| DCI 3A form (DCI format 3A) | Be used to send TPC order (1bit adjustment) | Size?1? |
The DCI form of the various PDCCH of table 1 and effect and bit number
According to the information bit of every kind of form, the size of DCI can fall into 5 types:
Size 0: corresponding to the DCI size ([26] bit) of PDCCH format 1C
Size 1: corresponding to PDCCH format 0, and 1A, 3, the DCI size of 3A ([44] bit)
Size 2: corresponding to the DCI size ([48] bit) of PDCCH format 1B
Size 3: corresponding to the DCI size ([55] bit) of PDCCH format 1
Size 4: corresponding to the DCI size ([72] bit) of PDCCH format 2
Here need to prove, the numerical value that passes through at present of [] expression, for the consistency of FDD and TDD, the adjustment that final numerical value may be by a small margin.
The MIMO technology is played an important role in communication system of new generation as the important raising transmission quality and the physical layer multi-antenna technology of efficient.For example, the LTE system supports multiple MIMO technology, comprises transmit diversity, space multiplexing technique and beam forming (BF, Beam forming) technology etc.
BF is as a kind of independently transmission mode, is with the technology difference of common MIMO, carries out demodulation according to dedicated pilot under the BF transmission mode.Particularly, at transmitting terminal, the same pre-coding matrix of dedicated pilot and The data is handled; At receiving terminal, do channel estimating according to dedicated pilot, directly obtain the equivalent channel after pre-coding matrix is handled, as seen, receiving terminal need not to know the concrete pre-coding matrix information that is adopted, but utilizes dedicated pilot just can obtain the equivalent channels information of data symbol experience.But in existing P DCCH form, also there is not professional format at BF.If utilize existing transformat, for example utilize the DCI format2 shown in the table 2, then in the signaling of transmission, comprise that precoding adds the information of matrix, causes the waste of resource.
DCI format 2 on table 2 PDCCH
Summary of the invention
In view of this, the invention provides the signaling method on a kind of PDCCH, be used under multithread BF transmission mode, carrying out the signaling transmission, can save system resource.
For achieving the above object, the present invention adopts following technical scheme:
Signaling method on a kind of down control channel comprises:
When under multi-flow beam moulding BF transmission mode, carrying out descending scheduling, the base station is on down control channel PDCCH, with the concurrent order of delivering letters of exclusive downlink control information DCI format organization of the BF transmission mode that sets in advance, do not comprise the relevant field of precoding information in the described DCI form.
Preferably, the described concurrent order of delivering letters of special-purpose DCI format organization with the BF transmission mode that sets in advance is:
In advance pre-coding matrix sequence number among DCI the 2nd form format2 and precoding are confirmed the indication field deletion, form the special-purpose DCI form of described BF transmission mode;
The concurrent order of delivering letters of special-purpose DCI format organization with described BF transmission mode.
Preferably, delivering letters when making so that the special-purpose DCI format organization of described BF transmission mode is concurrent, the transmission modulating-coding form MCS field that comprises two data blocks that when transmission adopts in the described special-purpose DCI form wherein utilizes in the MCS of any one data block and two data blocks except that described any one data block difference of another data block MCS to represent the MCS of described any one data block.
Preferably, modulation coding mode MCS fields account 3 bits of described any one data block.
Preferably, in the special-purpose DCI form of the described BF transmission mode that forms, BF number of plies field is set takies 1 bit.
Preferably, set in advance when carrying out descending scheduling under the BF transmission mode and to adopt the continuous resource method of salary distribution, and allow to adopt a kind of in non-frequency hopping and two kinds of transmission meanss of frequency hopping;
In the special-purpose DCI form of the described BF transmission mode that forms, further delete resource allocation header field, increase the frequency hopping indication field that is used to indicate whether to adopt the frequency hopping transmission means, and reduce the shared bit number of Resource Block RB allocation field.
Preferably, described frequency hopping indication field takies 1 bit, and described RB allocation field takies 13 bits.
Preferably, the DCI of the special-purpose DCI form of described BF transmission mode size is identical with the DCI size of DCI the 1st form format1.
As seen from the above technical solution, among the present invention, set in advance the special-purpose DCI form of BF transmission mode, do not comprise the relevant field of precoding information in this DCI form; When carrying out descending scheduling under multithread BF transmission mode, the base station is on PDCCH, with the concurrent order of delivering letters of DCI format organization of the BF transmission mode that sets in advance.Utilize the special-purpose DCI form of the BF transmission mode of above-mentioned setting, the relevant information of transfer pre-coding no longer is to save system resource.
Description of drawings
Fig. 1 is the overview flow chart of the signaling method on the PDCCH provided by the invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with the accompanying drawing contrast.
BF is as a kind of independently transmission mode, need not the pre-coding matrix of notifying the user to adopt, utilizes dedicated pilot just can obtain the equivalent channels information of data symbol experience.The relevant information that therefore, in the control signaling of UE is handed down in the base station, can not comprise precoding fully.
Basic thought of the present invention is: under the BF transmission mode, and the relevant information of transfer pre-coding no longer.
Fig. 1 is the overview flow chart of the signaling method on the PDCCH provided by the invention.As shown in Figure 1, this method comprises:
Step 101 sets in advance the special-purpose DCI form of BF transmission mode.
In the DCI of this setting form, no longer comprise the relevant information of precoding, for example indication field is confirmed in pre-coding matrix sequence-number field in the DCI format2 form and precoding.
Step 102, when carrying out descending scheduling under multithread BF transmission mode, the base station with the concurrent order of delivering letters of special-purpose DCI format organization of the BF transmission mode that sets in advance, does not comprise precoding information in the signaling that sends on PDCCH.
For the BF transmission mode of single current, can utilize the MIMO control channel of open loop, for example adopt DCI format 1 or DCI format 1A command transmitting.The present invention be directed to the mode when carrying out the signaling transmission under the BF transmission mode of multithread, particularly, in this step, when under multithread BF transmission mode, carrying out the signaling transmission, utilize the DCI format organization signaling that is provided with in the step 101, the signaling after will organizing again sends to UE.Because the DCI form that is provided with does not comprise precoding information, so do not comprise precoding information in tissue and the signaling that sends in this step yet in step 101, thereby save system resource.
So far, PDCCH of the present invention goes up the end of signaling method flow process.In above-mentioned flow process, the special-purpose DCI form of the concrete BF transmission mode that is provided with can have multiple according to application need, for saving system resource, can carry out the compression of information bit on the one hand, corresponding with it, the concrete mode when command transmitting is also not too identical; For not introduce extra coding mapping mode, it is identical with existing DCI size that new DCI form is guaranteed on the other hand.
Because BF also belongs to a kind of MIMO technology, the signaling basically identical that relates among signaling of being transmitted and the DCI format 2, so the special-purpose DCI form of the BF transmission mode that is provided with among the present invention is that improve on the basis with DCI format 2 just.Below just specifically introduce the application's embodiment.
Embodiment one:
Signaling method flow process in the present embodiment is as follows:
Step 21 sets in advance the special-purpose DCI form of BF transmission mode.
In the present embodiment, directly indication field is confirmed in deletion pre-coding matrix sequence-number field and precoding on the basis of existing DCI format 2, thereby forms the special-purpose DCI form of BF transmission mode, and is specifically as shown in table 3.
| Field? | Bits? | ?Comment? |
| Resource?allocation?header | 1? | It is type 0or1 that indication distributes type |
| RB?allocation? | 25? | PRB resource allocation indication |
| TPC? | 2? | The power control instruction of PUCCH |
| Number?of?layers | 2? | The BF number of plies: 1,2,3,4 |
| Hybrid?ARQ?process?number | 3/4? | HARQ process number: 3for FDD, max 4 for TDD |
| MCS，first?transport?block? | 5? | The transmission modulating-coding form of data block 1 |
| New?data?indicator?(1st?TB) | 1? | The upset indication (can detect the odd number omission) of new data block 1 |
| Redundancy?version?(1st?TB) | 2? | Redundancy versions |
| MCS，second?transport?block? | 5? | The transmission modulating-coding form of data block 2 |
| New?data?indicator(2nd?TB) | 1? | The upset indication of new data block 2 |
| Redundancy?version(2nd?TB) | 2? | Redundancy versions |
| HARQ?swap?flag | 1? | Whether HARQ: indicating needs exchange corresponding between two data blocks and the internal memory if exchanging sign |
| Precoding?information | 0 | The pre-coding matrix sequence number |
| Precoding?confirmation | 0 | Indication is confirmed in precoding: the PMI that has indicated whether to adopt UE to recommend |
| RNTI/CRC? | 16? | Be carried at 16 bit RNTI among the CRC |
| Total? | 66/67? | ? |
The special-purpose DCI form of the BF transmission mode that is provided with among table 3 embodiment one
By table 3 as seen, pre-coding matrix sequence number Precoding information field wherein and precoding confirm that the bit that indication Precoding confirmation fields account is used is 0, promptly no longer exists these two fields in this DCI form.Special-purpose DCI form shown in the above-mentioned table 3 is smaller for the modification of DCI format 2, but this will cause a kind of new DCI size, needs the coding mapping mode of a kind of DCI of extra definition, causes system complexity to increase.
Step 22, when carrying out descending scheduling under multithread BF transmission mode, the base station is on PDCCH, with the concurrent order of delivering letters of special-purpose DCI format organization shown in the table 3.
In this step, will need the signaling that sends to constitute DCI information according to the special-purpose DCI form shown in the table 3, identical in the transmission means of each relevant signaling and existing DCI format 2 forms, just no longer send the relevant information of precoding.Then the DCI information that forms is sent to UE.
So far, the signaling method flow process in the present embodiment finishes.
Embodiment two:
Signaling method flow process in the present embodiment is as follows:
Step 31 sets in advance the special-purpose DCI form of BF transmission mode.
For multithread BF, 8 aerial arrays are adopted in the base station, support the transmission means greater than 2 wave beams (beam), and the correlation between each beam can be very high, causes decreased performance.In general, support that 2 beam select preferably.Therefore, the concrete BF number of plies may be 1 or 2, and like this, the indication bit of BF number of plies field can further be reduced to 1 bit in the DCI form shown in the table 3.
In addition, in the DCI form shown in the table 3, comprise two parameters that data block is relevant that the time adopted with transmission, be respectively the upset indication of transmission modulating-coding form (MCS) field, data block 1 of data block 1 and redundancy versions field, the MCS field of data block 2, the upset indication and the redundancy versions field of data block 2.Consideration is between two data blocks, certain correlation is always arranged, therefore, the MCS of one of them data block can adopt the mode with another data block difference, and promptly the mode of difference is represented, this difference dynamic range is littler than simple MCS dynamic range, therefore, can on the DCI form basis shown in the table 3, further reduce the indication bit number of the MCS field of one of them data block, preferably, it can be reduced to 3 bits.
Through the compression of above-mentioned two aspect data bits, the DCI form that can obtain being provided with in the present embodiment is as shown in table 4, wherein, is 3 bits with the MCS field compression of data block 2.
The special-purpose DCI form of the BF transmission mode that is provided with among table 4 embodiment two
Step 32, when carrying out descending scheduling under multithread BF transmission mode, the base station is on PDCCH, with the concurrent order of delivering letters of special-purpose DCI format organization shown in the table 4.
In this step, the signaling that will need to send according to the special-purpose DCI form shown in the table 4 constitutes DCI information, wherein, and when organizing the MCS information of data block 2, form with difference between the MCS of data block 2 and data block 1 is represented the MCS information of data block 2, and inserts in the MCS field of data block 2.Then the DCI information that forms is sent to UE.
So far, the signaling method flow process in the present embodiment finishes.In the signaling method of present embodiment,,, further compressed the needed system resource of command transmitting by the compression BF number of plies and the shared bit number of MCS mode in the DCI form with respect to the mode that embodiment one provides.
Embodiment three:
Step 41 sets in advance the special-purpose DCI form of BF transmission mode.
In DCI format 2 forms, comprise the field that indexed resource distributes, be specially resource allocation head (Resource allocation header) field and PRB resource allocation indication (RB allocation) field, wherein, the Resource allocation header field indexed resource method of salary distribution, the indication of RB allocation field is concrete resource information of distributing under concrete resource distribution mode.At present, 3 kinds of mode: type0 are supported in the LTE scheduling, type1 and type2, wherein, resource allocation can be arbitrarily under the mode of type0 and type1, therefore, and corresponding these two kinds of resource distribution modes, need indicate each RB block message of distribution in RB allocation field, the bit number that takies is more; The type2 mode then is the continuous resource method of salary distribution, to should resource distribution mode, only needs to indicate the start information and the length of Resources allocation in RB allocation field, and the bit number that takies is less.
Consider above-mentioned resource distribution mode, in the present embodiment, resource distribution mode is fixedly installed to adopting type2, deletion Resource allocation header field from the DCI form shown in table 3 or the table 4, and further reduce the shared bit number of RB allocation field, thereby further compressed information bit.Preferably, can be with RB allocation field compression for taking 13 bits.
Further, because resource distribution mode adopts type2, thereby there has not been frequency diversity gain with respect to type0 and type1 mode, therefore preferably, can further increase frequency hopping indication (Distributed transmission) field, thereby make and when command transmitting, can select to adopt the frequency hopping mode, and then obtain certain diversity gain.Specifically, the Distributed transmission field of this increase can take 1 bit, is used to indicate whether to have adopted the frequency hopping mode.
Processing through above-mentioned several respects, the DCI form that can obtain being provided with in the present embodiment is as shown in table 5, and wherein, this DCI form is to carry out field compression and increase obtaining on the basis of the form of DCI shown in the table 4, certainly, also can on the basis of the form of DCI shown in the table 3, make amendment.
| Field? | Bits? | Comment? |
| Resource?allocation?header | 0 | It is type 0 or 1 that indication distributes type |
| Distributed?transmission | 1 | ? |
| RB?allocation? | 13 | PRB resource allocation indication (type 2) |
| TPC? | 2? | The power control instruction of PUCCH |
| Number?of?layers | 1 | The BF number of plies: 1,2, |
| Hybrid?ARQ?process?number | 3/4? | HARQ process number: 3for FDD, max 4for TDD |
| ?MCS，first?transport?block? | 5? | The transmission modulating-coding form of data block 1 |
| ?New?data?indicator(1st?TB) | 1? | The upset indication (can detect the odd number omission) of new data block 1 |
| ?Redundancy?version(1st?TB) | 2? | Redundancy versions |
| ?MCS，second?transport?block? | 3 | The transmission modulating-coding form of data block 2 |
| ?New?data?indicator(2nd?TB) | 1? | The upset indication of new data block 2 |
| ?Redundancy?version(2nd?TB) | 2? | Redundancy versions |
| ?HARQ?swap?flag? | 1? | Whether HARQ: indicating needs exchange corresponding between two data blocks and the internal memory if exchanging sign |
| ? Precoding?information | 0 | The pre-coding matrix sequence number |
| ? Precoding?confirmation | 0 | Indication is confirmed in precoding: the PMI that has indicated whether to adopt UE to recommend |
| ?RNTI/CRC? | 16? | Be carried at 16 bit RNTI among the CRC |
| ?Total? | 51/52? | ? |
The special-purpose DCI form of the BF transmission mode that is provided with among table 5 embodiment three
Step 42, when carrying out descending scheduling under multithread BF transmission mode, the base station is on PDCCH, with the concurrent order of delivering letters of special-purpose DCI format organization shown in the table 4.
In this step, the signaling that will need to send according to the special-purpose DCI form shown in the table 5 constitutes DCI information, wherein, adopt the type2 continuous resource method of salary distribution when carrying out resource allocation, and fill in the information of RB allocation field according to type mode correspondence, simultaneously, according to whether adopting frequency hopping to fill in Distributed transmission field.Then the DCI information that forms is sent to UE.
So far, the signaling method flow process in the present embodiment finishes.
In the present embodiment,, further compressed the needed bit number of special-purpose DCI form by for the fixedly installing of resource distribution mode.In the DCI form as shown in table 5, information bit is carried out compression more fully, utilized under the situation of same transfer resource, can obtain more performance.
In the foregoing description one, two and three, all need to increase a kind of new DCI size, the coding mapping mode that this will need additionally to define a kind of DCI causes system complexity to increase.
Embodiment four:
The signaling method flow process of present embodiment is as follows:
Step 51 sets in advance the special-purpose DCI form of BF transmission mode.
Being to avoid increases owing to introducing the system complexity that new DCI size causes, and when the special-purpose DCI form of BF transmission mode is set, makes under the newly-installed DCI form DCI size identical with existing certain DCI size in the present embodiment.Particularly, DCI form as shown in table 6 can be set, the size3 that this DCI size and DCI format 1 are corresponding is equal.
The special-purpose DCI form of the BF transmission mode that is provided with among table 6 embodiment four
As shown in table 6, BF number of plies field reverted to take 2 bits, the MCS field of two data blocks all is set to identical with existing DCI format 2, when transmission MCS information, also directly transmit concrete MCS information, and no longer adopt difference form.
Certainly, also can make under the special-purpose DCI form of BF transmission mode of setting the DCI size identical with existing other DCI sizes, the bit that needs consideration that other information are taken compresses or prolongs.
Step 52, when carrying out descending scheduling under multithread BF transmission mode, the base station is on PDCCH, with the concurrent order of delivering letters of special-purpose DCI format organization shown in the table 4.
In this step, the signaling that will need to send according to the special-purpose DCI form shown in the table 5 constitutes DCI information, then the DCI information that forms is sent to UE.
So far, the signaling method flow process in the present embodiment finishes.
Above-mentionedly be several embodiment of the present invention, in the invention described above, for the BF transmission mode is provided with special-purpose DCI form, be used to transmit DCI information, and the relevant information that in this special use DCI form, does not comprise precoding, thus when command transmitting with respect to multiplexing existing transformat, can save system resource, perhaps under identical transfer resource condition, improve transmission quality.
And further, on the most basic signaling transmission basis of this kind, can also further compress the shared bit of other fields according to the BF transmission feature, thereby can further save system resource, simultaneously for avoiding introducing the system complexity increase problem that new DCI size causes, can also be when the shared bit of other fields of compression, make under the DCI form of formation the DCI size identical with existing DCI size.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.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 (8)
1. the signaling method on the down control channel is characterized in that this method comprises:
When under multi-flow beam moulding BF transmission mode, carrying out descending scheduling, the base station is on down control channel PDCCH, with the concurrent order of delivering letters of exclusive downlink control information DCI format organization of the BF transmission mode that sets in advance, do not comprise the relevant field of precoding information in the described DCI form.
2. method according to claim 1 is characterized in that, the described concurrent order of delivering letters of special-purpose DCI format organization with the BF transmission mode that sets in advance is:
In advance pre-coding matrix sequence number among DCI the 2nd form format2 and precoding are confirmed the indication field deletion, form the special-purpose DCI form of described BF transmission mode;
The concurrent order of delivering letters of special-purpose DCI format organization with described BF transmission mode.
3. method according to claim 2, it is characterized in that, delivering letters when making so that the special-purpose DCI format organization of described BF transmission mode is concurrent, the transmission modulating-coding form MCS field that comprises two data blocks that when transmission adopts in the described special-purpose DCI form wherein utilizes in the MCS of any one data block and two data blocks except that described any one data block difference of another data block MCS to represent the MCS of described any one data block.
4. method according to claim 3 is characterized in that, modulation coding mode MCS fields account 3 bits of described any one data block.
5. method according to claim 3 is characterized in that, in the special-purpose DCI form of the described BF transmission mode that forms, BF number of plies field is set takies 1 bit.
6. according to claim 2,3 or 5 described methods, it is characterized in that, set in advance when carrying out descending scheduling under the BF transmission mode and to adopt the continuous resource method of salary distribution, and allow to adopt a kind of in non-frequency hopping and two kinds of transmission meanss of frequency hopping;
In the special-purpose DCI form of the described BF transmission mode that forms, further delete resource allocation header field, increase the frequency hopping indication field that is used to indicate whether to adopt the frequency hopping transmission means, and reduce the shared bit number of Resource Block RB allocation field.
7. method according to claim 6 is characterized in that, described frequency hopping indication field takies 1 bit, and described RB allocation field takies 13 bits.
8. method according to claim 6 is characterized in that, the DCI size of the special-purpose DCI form of described BF transmission mode is identical with the DCI size of DCI the 1st form format 1.
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| CN2008101147544A CN101605375B (en) | 2008-06-11 | 2008-06-11 | Method for sending signalings on downlink control channel |
| PCT/CN2009/072149 WO2009149647A1 (en) | 2008-06-11 | 2009-06-05 | Signaling transmission method and apparatus on downlink control channel |
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| CN2008101147544A CN101605375B (en) | 2008-06-11 | 2008-06-11 | Method for sending signalings on downlink control channel |
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| WO2011134107A1 (en) * | 2010-04-30 | 2011-11-03 | Telefonaktiebolaget L M Ericsson (Publ) | Control signaling design for lte-a downlink transmission mode |
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| WO2009149647A1 (en) | 2009-12-17 |
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