CN102077658A - Indication method and base station for sdma transmission - Google Patents
Indication method and base station for sdma transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
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Abstract
An indication method and a base station for Space Division Multiple Access (SDMA) transmission are provided, the method comprises: when the SDMA transmission is adopted in the Long Term Evolution (LTE) system, the power allocation information is disposed in the Downlink Control Information (DCI), so as to indicate the terminal to perform demodulation based on the power allocation information (11); the DCI containing the power allocation information is transmitted to the terminal (12). The base station comprises a disposing module and a transmission module, or only comprises a transmission module. The above-mentioned technical proposal allows the terminals which use different beam for transmission to acquire respective power allocation information by means of disposing power allocation information in the transmission signal, consequently the indication for SDMA transmission is realized, the space division multiplex technique that plurality of users multiplexing one and the same time-frequent resource is supported, and the utilization ratio is effectively enhanced.
Description
The indicating means of space division multiple access transmission and station technology field
The present invention relates to indicating means and the base station of communication technical field, more particularly to a kind of transmission of space division multiple access.Background technology
Long Term Evolution（Long Term Evolution, LTE) it is third generation partner program（3rd Generation Partnership Project, 3GPP) evolution technology, improve and enhance 3GPP aerial access technology.LTE uses OFDM（Orthogonal Frequency Division Multiplexing, OFDM) and multiple-input and multiple-output（Multiple Input Multiple Output, MIMO) eated dishes without rice or wine technology Wu the core of Xian Wang Network evolution as its, descending 100Mbps and up 50Mbps peak rate can be provided under 20MHz spectral bandwidths, cell capacity is improved, Time Delay of Systems is reduced.
MIMO is advanced multi-antenna technology in wireless communication system, by using the respective independently transmitted signal of multiple antennas of transmitting terminal, while in receiving terminal with multiple antenna receive informations.The spatial degrees of freedom that MIMO is mainly provided using many transmitting antennas and many reception antennas is come effective spectrum efficiency for lifting wireless communication system, so as to promoting transmission rate and improve signal quality, it can significantly increase the handling capacity and transmission range of system in the case where system bandwidth or total transmit power need not be increased.
In addition, LTE agreements also support another advanced multi-antenna technology i.e. beam forming (Beamforming) Beamforming to constitute aerial array by multiple bays, to obtain array gain using beam-forming technology, the signal on multiple bays is produced into wave beam forming by the weights of the certain feature of signal imparting to launching or receiving between multiple bays, so that transmitting or reception signal have obvious directional characteristic, useful signal can effectively be strengthened and restrain interference, the signal to noise ratio of signal is improved.
When being that the node B (Evolution Node B, eNodeB) of evolution supports multiple aerial arrays in LTE base station, MIMO can be used in combination with Beamforming.That is, each aerial array is used
Beamforming technologies, and MIMO technology is used between multiple aerial arrays.Here, MIMO technologies include transmitting diversity and space division multiplexing.Such as by physical antenna（PA) it is grouped, every group of PA corresponds to a virtual-antenna（ Virtual Antenna ).Each transport layer is mapped in a subset of physical antenna by the mapping block of virtual-antenna-physical antenna, and carries out figuration respectively.So, different physical antenna subsets forms different wave beams, and for transmitting, different layers, space division multiplexing is realized with this.
The multiple wave beams formed can distribute to different users, and this is referred to as space division multiple access（Space Division Multiple Access, SDMA) transmit, each user uses one of wave beam or multiple wave beams, due to the low interference between wave beam, the signal to noise ratio that so both can have improved signal using Beamforming array gain reduces the interference between user, the channel capacity of system can be further provided for using MIMO technology simultaneously again, spectrum utilization efficiency is improved, there is preferable practical value.
When eNodeB uses above-mentioned technical transmission signal, it is necessary to send relevant information to terminal, correct receive is carried out to data-signal with instruction terminal and demodulated.
In the prior art, when eNodeB transmits signal using Beamforming, descending control signaling is utilized（Downlink Control lnformation, DCI) instruction terminal carry out to data-signal carry out reception demodulation.Indicating means includes：By DCI format 1A (DCI format 1A) signalings by resource distribution instruction, code modulation mode indicate, hybrid automatic repeat-request（Hybrid Automatic Repeat Request, HARQ) enter number of passes, new data instruction, ascending physical signal control channel（Physical uplink control channel, PUCCH power) is indicated, redundancy versions are indicated, CRC (Cyclical Redundancy Check,) etc. CRC relevant information is transferred to terminal, is demodulated so that terminal carries out correct receive to data-signal according to above-mentioned relevant information.
During the present invention is realized, inventor has found that descending control signaling DCI format 1A only support the Beamforming of unique user to transmit in the prior art, it is impossible to support the SDMA transmission of multiple user's multiplexings.Therefore, it is badly in need of the instruction that a kind of technology realizes SDMA transmission in LTE system at present.The content of the invention
The embodiment of the present invention proposes indicating means and the base station of a kind of space division multiple access transmission, to realize SDMA
The instruction of transmission.
The embodiments of the invention provide a kind of indicating means of space division multiple access transmission, including：
When being transmitted in long evolving system using space division multiple access, power allocation information is arranged in descending control signaling, so that instruction terminal is demodulated according to the power allocation information；
The descending control signaling comprising the power allocation information is sent to the terminal.
The embodiment of the present invention additionally provides a kind of indicating means of space division multiple access transmission, including：
When being transmitted in long evolving system using space division multiple access, descending control signaling is sent to terminal, to indicate that the terminal is demodulated according to the power allocation information；The descending control signaling does not include code book indication field, and remainder is identical with descending control signaling form 1D.
The embodiment of the present invention additionally provides a kind of base station, including：
Setup module, during for transmitting signal using space division multiple access in long evolving system, power allocation information is arranged in descending control signaling, so that instruction terminal is demodulated according to the power allocation information；
Sending module, for sending the descending control signaling comprising the power allocation information to the terminal.The embodiment of the present invention additionally provides a kind of base station, including：Sending module, during for being transmitted in long evolving system using space division multiple access, sends descending control signaling to terminal, to indicate that the terminal is demodulated according to the power allocation information；The descending control signaling indicates that remainder is identical with descending control signaling form 1D not comprising code book.
Above-mentioned technical proposal by setting power allocation information in the transmission signal, so that the terminal transmitted using different beams results in the power allocation information of respective signal simultaneously, it is achieved thereby that the instruction of SDMA transmission, the space division multiplexing technology that multiple users are multiplexed same running time-frequency resource is supported, the availability of frequency spectrum is effectively improved.Brief description of the drawings
Fig. 1 is a kind of flow chart of the indicating means of space division multiple access transmission in the embodiment of the present invention；Fig. 2 is a kind of structural representation of base station in the embodiment of the present invention.
Embodiment
The technical scheme to the embodiment of the present invention is described in further detail below.
Fig. 1 is a kind of flow chart of the indicating means of space division multiple access transmission in the embodiment of the present invention.This method includes：
Power allocation information is arranged in DCI, so that instruction terminal is demodulated according to the power allocation information by step 11. eNodeB when LTE system uses SDMA transmission signal；
Step 12. sends the DCI comprising power allocation information to the terminal.So, terminal is received after DCI, and power allocation information that just can be in DCI is demodulated.
Because eNodeB transmission power is limited, when using SDMA transmission is carried out, multiple users being multiplexed together will use same running time-frequency resource, this requires eNodeB carrying out power distribution between these users being multiplexed, and the information of power distribution is notified into terminal by control signaling.Therefore, in the present embodiment, eNodeB is in the case where LTE system uses SDMA transmission signal, the power distributed for multiple users using different beams simultaneous transmission of signals, power allocation information is sent to terminal, each user is demodulated according to power allocation information, realizes each user and correct reception demodulation is carried out to data-signal, meet the demand that multiple users use different beams simultaneous transmission.
In above-mentioned steps 11, power allocation information, which is arranged in DCI, may include：Power allocation information is set in DCI.Setting 1 or 2 bits represent power allocation information such as in the DCI..
In the embodiment of the present invention in the indicating means of another space division multiple access transmission, it can indicate to distribute to the power information of terminal by designing a kind of new DCI format.One way in which is the modification to existing DCI format 1A to distribute to the power information of terminal when indicating and using space division multiplexing transmission pattern.The Examples of information that a kind of amended DCI is included is as follows：
Power allocation information indication field（If distributing information with kilo byte indicated horsepower）；
Resource distribution instruction field (is not limited）；
Code modulation mode indication field（Do not limit）；
HARQ process digital sections (are not limited）；
New data indication field（Do not limit）；
PUCCH power indication field (is not limited）；
Redundancy versions indication field (is not limited）；
CRC check field（Do not limit）.
In the embodiment, power allocation information indication field is used as by increasing by 1 bit in existing DCI format 1A.The different state representation transmission powers of the field carry out some deciles, such as with state ' 0, represent that power is constant, power drop half is represented with state T, that is, represent that power has subtracted 3 decibels（ dB ).Other bits are not limited, the implication and rule that existing DCI format 1A can be kept to define.
In the present embodiment, when there is multiple users to belong to SDMA transmission, eNodeB transmission power can be indicated in this way when these users carry out constant power distribution.
In the indicating means of the space division multiple access of another in embodiment of the present invention transmission, the power information of terminal is distributed to when indicating and using space division multiplexing transmission pattern still through to existing DCI format 1A modification.The Examples of information that a kind of amended DCI is included is as follows：
Power allocation information indication field（If distributing information with kilo byte indicated horsepower）；
Resource distribution instruction field (is not limited）；
Code modulation mode indication field（Do not limit）；
HARQ process digital sections (are not limited）；
New data indication field（Do not limit）；
PUCCH power indication field (is not limited）；
Redundancy versions indication field (is not limited）；
CRC data field（Do not limit）.
In the present embodiment, power allocation information indication field can be used as by increasing by 2 or more than 2 bits in existing DCI format 1A, the quantification gradation of power distribution is set up.The different conditions of the field represent the number of specific power distribution.The bit of other fields is not limited, and keeps original implication and rule.For example, being used as power allocation information indication field using 2 bits（It is not limited to these indicating modes）：
Field value power allocation information
00 total power
01 1/4 total powers
10 1/2 total powers
11 3/4 total powers
Assuming that terminal A, terminal B and terminal C use different beams simultaneous transmission of signals, the power that eNodeB distributes to user A, terminal B and terminal C is respectively 1/4 total power, 1/4 total power and 1/2 total power, then eNodeB by be sent to resource distribution instruction field is respectively provided with terminal A and terminal B DCI value be " 01 ", by be sent to resource distribution instruction field is respectively provided with terminal C DCI value be " 10 ".So, the value for the resource distribution instruction field that terminal A, terminal B and terminal C just can be in the DCI received obtains respective power allocation information, and then is demodulated according to the power allocation information of acquisition, so as to realize correct demodulation.
Another example, power allocation information indication field is used as using 3 bits：
In the present embodiment, when being indicated in this way, the power distribution belonged between multiple users of SDMA transmission can be allocated with unequal according to the channel situation of each user.Assuming that the channel quality of the user nearer apart from base station is better than the channel quality apart from base station user farther out, then the power of user's distribution that can be good to channel quality is few, and the power that the user to bad channel quality distributes is more
Some, so that more flexible efficiently utilize running time-frequency resource.
Or, in above-mentioned steps 11, power allocation information, which is arranged in DCI, may include：The CRC data in DCI are carried out plus covered with the mask for representing power allocation information.So, after terminal is received plus has covered the DCI of power allocation information, it is possible to know allocated power information, and be demodulated according to the power information of the distribution.
In the indicating means of the space division multiple access of another in embodiment of the present invention transmission, eNodeB power distribution can be represented by way of existing DCI format 1A CRC is carried out plus covered.
In radio communication, in order to prevent the reception data of mistake, typically transmitting terminal is wanted to need to carry out data with CRC data CRC codings, also, the CRC data is added in the CRC data field of control instruction.If there is mistake in the data that receiving terminal is received, it can not just pass through CRC check.
In the present embodiment, eNodeB power allocation information is represented by way of existing DCI format 1A CRC data is carried out plus covered.For example, when eNodeB does not carry out power distribution, CRC data is not carried out plus covered；And be that mask adds to CRC data row and covered with specific sequence when eNodeB carries out power distribution to user equipment (User Equipment, UE).Wherein, specific sequence is that mask is used to represent power allocation information, namely the situation that indicated horsepower is distributed.Length such as CRC data is 24, is expressed as CRC (24), the sequence length of mask is also 24, is expressed as Mask (24).Transmitting terminal adds the process covered to include：
CRC_Mask(24) = (CRC(24)+Mask(24)) mod 2;
Wherein, the CRC data that CRC-Mask (24) is represented by plus covered, mod is modulo operation.When data transfer is correct, receiving terminal wants correct verification data, need to be to CRC-Mask (24;>Carry out solution to cover, be represented by：
CRC(24) = (CRC_Mask(24)+Mask(24)) mod 2;
Receiving terminal is that CRC-Masks (24) of the UE by using possible Mask (24) sequences with receiving is matched, if matched, it is power allocation information to illustrate mask (24) sequence, it is demodulated so as to know the power allocation information for receiving data, and then obtain the data point that be demodulated.
In the present embodiment, indicated in this way, use the existing A forms of DCI format 1
Realize, without increasing new control signaling form, so as to reduce volume of transmitted data, alleviate channel load.The indicating means of the space division multiple access of another in embodiment of the present invention transmission includes：When using SDMA transmission in LTE system, DCI is sent to terminal, to indicate that the terminal is demodulated according to the power allocation information；The DCI indicates that remainder is identical with DCI format 1D not comprising code book.DCI in the present embodiment can be realized by improving existing DCI format 1D signalings.Such as, the new DCI formed after the code book in existing DCI format ID is indicated is deleted, it is possible to achieve the instruction of SDMA transmission.New DCI can include following information：
Power allocation information is indicated（If distributing information with kilo byte indicated horsepower）；
Resource distribution instruction（Do not limit）；
Code modulation mode is indicated（Do not limit）；
HARQ enters number of passes（Do not limit）；
New data indication field（Do not limit）；
PUCCH power is indicated（Do not limit）；
Redundancy versions are indicated（Do not limit）；
CRC data（Do not limit）.
Now, the mode of terminal acquisition channel information can obtain the mode of channel information compared with terminal under beamforming transmission means in technology.
Fig. 2 is a kind of structural representation of base station in the embodiment of the present invention.The base station can be eNodeB, including：Setup module 21 and sending module 22.In the case where eNodeB uses SDMA transmission signal, power allocation information is arranged in DCI by setup module 21, so that instruction terminal is demodulated according to the power allocation information；Sending module 22 sends the DCI comprising power allocation information to the terminal, and terminal is received after DCI, and power allocation information that just can be in DCI is demodulated.
In the present embodiment, eNodeB is in the case of using SDMA transmission signal, the power distributed for multiple users using different beams simultaneous transmission of signals, power allocation information is arranged in the DCI by setup module 21, and power allocation information is sent to by terminal by sending module 22, each user is demodulated according to power allocation information, realizes each user and data-signal is carried out
It is correct to receive demodulation, meet the demand that multiple users use different beams simultaneous transmission.In the embodiment of the present invention in another base station, setup module can be specifically for increasing bit in the DCI；Such as increase the bit for representing power allocation information in DCI format 1A, refer to above method embodiment.
In the base station of another in the embodiment of the present invention, the setup module can be specifically for being carried out plus being covered to the CRC data in DCI with the mask for representing power allocation information；The CRC data covered by adding is replaced to the CRC data in DCI format 1A.So, after terminal is received plus has covered the DCI of power allocation information, it is possible to know allocated power information, and be demodulated according to the power information of the distribution.Plus cover the concrete mode of power allocation information and refer to above method embodiment.
Another base station in the embodiment of the present invention includes sending module.When sending module is used to use SDMA transmission in LTE system, DCI is sent to terminal, to indicate that the terminal is demodulated according to the power allocation information；The DCI indicates that remainder is identical with DCI format 1D not comprising code book.The DCI can indicate acquisition by deleting the code book in DCI format ID, for carrying out the DCI of SDMA transmission, to realize the instruction of SDMA transmission.
The above method and base station embodiment solve the problem of descending control signaling form defined in existing protocol can only support a Beamforming array by the expansion to 3GPP LTE existing protocols, lead to
UE, has given full play to the advantage of multi-antenna technology.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can be completed by the related hardware of programmed instruction, foregoing program can be stored in a computer read/write memory medium, the program upon execution, performs the step of including above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or CD etc. are various can be with the medium of store program codes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although the present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It can still modify to the technical scheme described in foregoing embodiments, or carry out equivalent substitution to which part technical characteristic；And these modifications or replacement, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
- Claim1st, a kind of indicating means of space division multiple access transmission, it is characterised in that including：When being transmitted in long evolving system using space division multiple access, power allocation information is arranged in descending control signaling, so that instruction terminal is demodulated according to the power allocation information；The descending control signaling comprising the power allocation information is sent to the terminal.2nd, the indicating means of space division multiple access transmission according to claim 1, it is characterised in that power allocation information is arranged on into descending control signaling includes：One or more bit is set in the descending control signaling, for representing power allocation information.3rd, the indicating means of space division multiple access transmission according to claim 1 or 2, it is characterised in that the descending control signaling is specifically included：Resource distribution instruction field, code modulation mode indication field, hybrid automatic repeat request process digital section, new data indication field, the power indication field of ascending physical signal control channel, redundancy versions indication field, CRC data field and the power allocation information indication field for representing the power allocation information.4th, the indicating means of space division multiple access transmission according to claim 1, it is characterised in that power allocation information is arranged on into descending control signaling includes：With the mask for representing power allocation information the CRC data in the descending control signaling are carried out with power mouthful to cover.5th, a kind of indicating means of space division multiple access transmission, it is characterised in that including：When being transmitted in long evolving system using space division multiple access, descending control signaling is sent to terminal, to indicate that the terminal is demodulated according to the power allocation information；The descending control signaling does not include code book indication field, and remainder is identical with descending control signaling form 1D.6th, a kind of base station, it is characterised in that including：Setup module, during for transmitting signal using space division multiple access in long evolving system, power allocation information is arranged in descending control signaling, so that instruction terminal is solved according to the power allocation information Sending module, for sending the descending control signaling comprising the power allocation information to the terminal.7th, base station according to claim 6, it is characterised in that the setup module in the descending control signaling specifically for setting one or more bit, for representing power allocation information.8th, the base station according to claim 6 or 7, it is characterised in that the descending control signaling is specifically included：Resource distribution instruction field, code modulation mode indication field, hybrid automatic repeat request process digital section, new data indication field, the power indication field of ascending physical signal control channel, redundancy versions indication field, CRC data field and the power allocation information indication field for including power allocation information.9th, base station according to claim 6, it is characterised in that the setup module is covered specifically for the mask for representing power allocation information the CRC data in the descending control signaling are carried out with power mouthful.10th, a kind of base station, it is characterised in that including：Sending module, during for being transmitted in long evolving system using space division multiple access, sends descending control signaling to terminal, to indicate that the terminal is demodulated according to the power allocation information；The descending control signaling indicates that remainder is identical with descending control signaling form 1D not comprising code book.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2009/070788 WO2010102455A1 (en) | 2009-03-13 | 2009-03-13 | Indication method and base station for sdma transmission |
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| CN102077658A true CN102077658A (en) | 2011-05-25 |
| CN102077658B CN102077658B (en) | 2013-08-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095297A1 (en) * | 2016-11-23 | 2018-05-31 | Huawei Technologies Co., Ltd. | System and method for group-assisted downlink transmission |
| CN111130659A (en) * | 2018-10-30 | 2020-05-08 | 华为技术有限公司 | Method, device, system and chip for multi-channel parameter estimation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB0008488D0 (en) * | 2000-04-07 | 2000-05-24 | Koninkl Philips Electronics Nv | Radio communication system and method of operating the system |
| EP1232574B1 (en) * | 2000-10-05 | 2009-05-27 | Samsung Electronics Co., Ltd. | Tstd apparatus and method for a tdd cdma mobile communication system |
| JP3880554B2 (en) * | 2003-07-18 | 2007-02-14 | 松下電器産業株式会社 | Space division multiple access wireless medium access controller |
| KR100836141B1 (en) * | 2005-12-21 | 2008-06-09 | 삼성전자주식회사 | Apparatus and method for allocating power in a space division multiple access system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095297A1 (en) * | 2016-11-23 | 2018-05-31 | Huawei Technologies Co., Ltd. | System and method for group-assisted downlink transmission |
| US10778387B2 (en) | 2016-11-23 | 2020-09-15 | Huawei Technologies Co., Ltd. | System and method for group-assisted downlink transmission |
| CN111130659A (en) * | 2018-10-30 | 2020-05-08 | 华为技术有限公司 | Method, device, system and chip for multi-channel parameter estimation |
| CN111130659B (en) * | 2018-10-30 | 2021-10-26 | 华为技术有限公司 | Method, device, system and chip for multi-channel parameter estimation |
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| WO2010102455A1 (en) | 2010-09-16 |
| CN102077658B (en) | 2013-08-07 |
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