CN107154839B - A method of indicating whether soft merging in NOMA - Google Patents
A method of indicating whether soft merging in NOMA Download PDFInfo
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- CN107154839B CN107154839B CN201710355990.4A CN201710355990A CN107154839B CN 107154839 B CN107154839 B CN 107154839B CN 201710355990 A CN201710355990 A CN 201710355990A CN 107154839 B CN107154839 B CN 107154839B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention is a kind of method that soft merging is indicated whether in NOMA (non-orthogonal multiple access), and mistake merging may occur when for solving the problems, such as that nearly user indicates that NDI carries out HARQ soft merging according to remote user's new data when application NOMA technology carries out data investigation transmission.The present invention provides two schemes, and one is increase by 1 bit in the Downlink Control Information DCI of nearly user to indicate whether nearly user merges the data of remote user；Another kind is whether the C-RNTI for use when CRC scrambling by the DCI to nearly user inverts to assist whether nearly user merges the data of remote user.It is clear that the inventive method is easy to realize, and processing complexity is low, all has backwards compatibility for remote user, is the scene of legacy user suitable for remote user.
Description
Technical field
The invention belongs to mobile communication fields, are related to non-orthogonal multiple access (NOMA) technology, specifically provide one kind and exist
The method of soft merging is indicated whether in NOMA.
Background technique
5G system is proposed non-orthogonal multiple access (NOMA) to realize higher spectrum efficiency as a kind of important
Multiplexing technology.Different from traditional multiplex mode, NOMA will meet the use of more users by distributing non-orthogonal resource.
It is on the uplink to realize a kind of scheme of NOMA using multi-user's superposed transmission of power domain.As shown in Figure 1, power domain
NOMA allows multiple users to realize the shared of time and frequency resource in identical space layer by different power distributions；Specifically
For, base station eNB sends the data of nearly user and remote user using identical time, frequency spectrum and space layer pairing, and by total work
Rate distributes to remote user and nearly user in certain proportion.Due to near-far interference, the channel conditions of different user exist significant
Difference, the path loss between remote user and base station is larger, the transmission that base station will distribute more power and be used for remote user information,
So that remote user can successfully connect in the case where far and near user data is superimposed using the nearly user information of superposition as interference
Harvest derives from oneself information.In comparison, since the path loss between nearly user and base station is smaller, base station can be distributed less
Power be used for the transmission of nearly user data, nearly user can be received using the method for successive interference cancellation (SIC), that is, be existed
The signal of remote user is recovered from resultant signal after receiving superposed signal and then is eliminated again, and finally remaining signal is solved
It reconciles and decodes, to obtain the information of oneself.
Due to using the reception mode of SIC in NOMA, nearly user needs to know demodulation to solve the information of remote user
Auxiliary information (bibliography 1:3GPP TR 36.859V13.0.0, Dec, 2015) required for remote user information, such as MCS
(Modulation and Coding Scheme, modulation coding scheme), RV (Redundancy Version, redundancy versions),
NDI (New-Data Indicator, new data instruction), transport block size etc., so existing company is to nearly user DCI
The design of (Downlink Control Information, Downlink Control Information) proposes some schemes, such as bibliography 2
(ZTE,MediaTek,Qualcomm,R1-165794,“Way forward on DCI transmission for MUST",
Nanjing, China, 23th -27th May 2016) design scheme of nearly user DCI in the power domain NOMA that proposes.It is designing
In scheme, nearly user can not only obtain when demodulating DCI controls information required for demodulating oneself data, can also obtain the remote user of solution
Auxiliary information needed for data.
Since data transmission fault may occur for the influence that signal is interfered with noise in transmission process,
HARQ (Hybrid Automatic Repeat request, hybrid automatic repeat-request) mechanism is used in LTE.HARQ machine
One pith of system is the use of soft merging, and during soft merging, receiving end can to received first biography and again
It passes data to merge to improve successful receiving rate, wherein receive before but failed decoded data are stored in receiving end
Soft bit cache unit.It provides in the TS 36.321 of LTE, is indicated in descending scheduling signaling PDCCH by NDI bit
This scheduled data is just to pass or retransmit.It is passed if it is first, then receiving end directly carries out this received data
It decodes and removes soft bit caching, if it is re-transmission, then the data in this received data and soft bit caching should be carried out
It is decoded again after merging to improve decoding accuracy.
In order to realize that SIC, nearly user need the data of the successively data to remote user and nearly user oneself at nearly user
It is demodulated.When nearly user fails correctly to demodulate the data of remote user, needs the data by remote user to be stored in soft bit and delay
In depositing；When remote with this user matches transmission to nearly user again, remote user data that nearly user can receive this with it is soft
Remote user data in bit caching merges.However, since this remote user data transmitted delays with soft bit is stored in
Remote user data in depositing may not be same data, and nearly user is possible to the different numbers of same remote user mistakenly
According to merging, to cause reception failure.
The above problem is explained with specific example below.Assuming that have nearly user UE1 and remote user UE2, in current subframe,
Nearly user UE1 and remote user UE2 pairing is transmitted, after a while, due to occurring close use in the subframe of pairing transmission
Family UE1 solves the case where data failure of remote user UE2, then it is assumed that two users no longer meet pairing condition, the scheduling plan of base station
It slightly changes, nearly user UE1 user's pairing remote with other, or nearly user UE1 is enabled to return back to non-NOMA state, meanwhile, base
Standing can also allow remote user UE2 user's pairing close with other, or remote user UE2 to return to non-NOMA state.
In the above case said, since nearly user UE1 solves the information failure of remote user UE2, nearly user UE1 can be by remote user
The data of UE2 carry out HARQ merging when storing the data in soft bit caching in case of the remote user UE2 of base station later retransmission.By
After a period of time, the nearly user UE1 and remote user UE2 of scheduling is matched in base station simultaneously again, at this time to the scheduling of far and near user data
Situation may are as follows: if 1) remote user UE2 does not solve last time successfully yet and with clock synchronization base station issues the data of UE2 before this,
Then the legacy data of the base station nearly data of user UE1 and remote user UE2 (lose by the data and transmission before for being transferred to remote user UE2
Lose and the data being buffered at nearly user UE1 be identical) superposed transmission；2) if remote user UE2 is successfully solved before this
Last time issues the data of UE2 with clock synchronization base station, then the new data of the base station nearly data of user UE1 and remote user UE2 (are transferred to
The new data of remote user UE2 fails from transmission before and the data being buffered at nearly user UE1 are different, and concrete scene will below
In Fig. 2 and Fig. 3 be described in detail) superposed transmission.
For the first above-mentioned situation, the remote user data cached by the data for the remote user being superimposed with nearly user
It is identical, therefore the data in soft bit being cached merge.And for above-mentioned second situation, because what is be superimposed is remote
User data is different from the remote user data that nearly user is cached, therefore should empty the data in soft bit caching without that should carry out
Merge, however, if nearly user decides whether to carry out soft bit merging only according to the NDI bit in remote user PDCCH,
There may be following scenes: setting remote user UE2 and receives data failure before matching again with nearly user UE1, and base station is again
The data of remote user UE2 are retransmitted after pairing.At this point, the NDI bit in remote user PDCCH will be used to indicate this transmission
To retransmit.So close user UE1 after receiving the PDCCH of remote user UE2 of pairing, can by the data of remote user UE2 with
The data cached merge.Since the data for being sent to UE2 at this time are different from the data of the UE2 cached of UE1 before, then merge
When there is mistake, as shown in Figures 2 and 3.In Fig. 2, UE2 is matched with another user UE3 before matching again with UE1 and is passed
It is defeated, and UE2 receives data failure；After UE2 and UE1 are matched again, base station retransmits the data of UE2.In Fig. 3,
UE2 is in the non-NOMA mode that advances into matched again with UE1, and UE2 receives data failure；It is matched again in UE2 and UE1
Afterwards, base station retransmits the data of UE2.
In 3GPP current technology scheme, there are no proposing that targetedly method solves the above problems, i.e., in downlink
In NOMA, due to the adjustment of pairing strategy, when indicating to carry out HARQ soft merging according to remote user NDI mistake may occur for nearly user
The case where merging.It is, therefore, desirable to provide new method, takes into account signaling overheads and implementation complexity while solving the problems, such as.
Summary of the invention
When the present invention indicates to carry out HARQ soft merging according to remote user NDI for user close in above-mentioned downlink NOMA
A kind of method that soft merging is indicated whether in NOMA may be provided there is a situation where mistake merging.
The method provided by the invention that soft merging is indicated whether in NOMA, by following scheme one or scheme two come real
It is existing；
Scheme one: base station increases by 1 bit in the DCI of nearly user to indicate whether nearly user carries out the data of remote user
Merge；
Scheme two: base station carries out C-RNTI (the Cell Radio- used when CRC scrambling by the DCI to nearly user
Network Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI) whether invert to indicate whether nearly user is right
The data of remote user merge.
The advantages and positive effects of the present invention are:
In the method for the present invention, used scheme one is simply clear, is directly indicated by increasing by 1 bit in DCI close
Whether user merges the data of remote user；Used scheme two will not change DCI length, therefore not will increase nearly use
The PDCCH blind examination number at family；Only increase a CRC descrambling operation, newly-increased processing complexity is lower.Meanwhile of the invention two
Kind scheme all has backwards compatibility for remote user, is the scene of legacy user suitable for remote user.
Detailed description of the invention
Fig. 1 is downlink NOMA scheme schematic diagram；
Fig. 2 is the 1st kind of situation schematic diagram of soft merging error situation；
Fig. 3 is the 2nd kind of situation schematic diagram of soft merging error situation；
Fig. 4 is one schematic diagram of mode that the present invention determines soft merging；
Fig. 5 is the demodulating process schematic diagram using the present invention program one.
Fig. 6 is the demodulating process schematic diagram of application scheme two.
Fig. 7 is an exemplary diagram of application scheme two.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.Below to institute in embodiment description
The attached drawing used is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creativeness
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
As shown in Figures 2 and 3, match clock synchronization again in nearly user and remote user, what nearly user was cached matched before
Fail in journey the remote user being properly received data and again match after base station be sent to remote user data it is not necessarily identical.Such as
What remote user's transmission was given in fruit base station just is the re-transmission of new data, then nearly user is only by the NDI detected in remote user PDCCH
Bit, which can miss, merges the different data of remote user, to cause to receive mistake.By analysis it is found that the pass that problem generates
Key is if closely user is only according to the NDI bit in the DCI of remote user to determine whether closing to the data of remote user
And it is likely to occur mistake, therefore, nearly user needs to know whether that the data to remote user merge by the way of additional.
The method provided by the invention that soft merging is indicated whether in NOMA introduces new mode to notify the nearly user to be
The no data to remote user merge.The present invention proposes two kinds of solutions.It is a kind of to increase by 1 bit in the DCI of nearly user
To indicate whether that the data to remote user merge；A kind of DCI by nearly user carries out the C- used when CRC scrambling
Whether RNTI, which inverts, is come come the data for the remote user for assisting nearly user to judge pairing transmission for the method for new data or legacy data
Solve the problems, such as whether merge.All operations are all transparent for the remote user of pairing in the method for the present invention, therefore, remote to use
Family either support NOMA user be also possible to legacy user, ensure that compatibility.
In the first scheme, in order to make nearly user know whether the remote user information in should transmitting this with corresponding this is remote
Information in the soft bit caching of user merges, and can be indicated using most direct mode, i.e., increase 1bit in auxiliary information
Indicating bit come indicate remote user data that whether nearly user should receive current subframe be stored in it is remote in soft bit caching
User data merges, as shown in Figure 4.For example, representing this base station if the newly-increased bit value is " 1 " and being sent to
The legacy data of the data of remote user nearly user's demodulation failure before being, needs to merge；If the newly-increased bit value is " 0 ",
Representing this base station and being sent to the information of remote user is new information, then should not merge.Such scheme is relatively simple, to association
View influence is smaller, but changes DCI length, is influenced on the blind examination number of user.
It is as shown in Figure 5 using the demodulating process after the first scheme.Base station eNB, which is sent in the auxiliary information of nearly user, to be increased
After adding 1bit indicating bit, nearly user to receive current subframe, decoding control information and auxiliary information, judge indicating bit value whether
For " 1 ", if so, nearly user by the remote user data received be stored in soft bit cache in remote user data close
And otherwise, nearly user obtains new data, while emptying data in the soft bit caching for distribute to remote user.
In second scheme, by base station to the DCI of the nearly user C-RNTI used when CRC scrambling whether invert come
Nearly user is assisted to judge the data of the remote user of pairing transmission for new data or legacy data.When base station is matched again, scheduling is close to be used
Family and when remote user, if the data for being sent to remote user before being nearly user once demodulated the data of failure, base station is to close
When the DCI of user carries out CRC scrambling, using the nearly user C-RNTI after reversion, it is denoted asIt is carried out with CRC check position
Exclusive or；Otherwise, if the data for being this time transferred to remote user are not the data that nearly user once demodulated failure before, base station exists
When carrying out CRC scrambling to the DCI of nearly user, exclusive or directly will be carried out with the C-RNTI of nearly user and CRC check position.In user terminal
During received, when nearly user receives current subframe, it can attempt to use respectivelyCRC descrambling is carried out with C-RNTI.
When withDescramble successfully, nearly user knows that received remote user data is the data for once demodulating failure before, then will
Remote user data in current subframe merges with the remote user data in soft bit caching；If descrambled successfully with C-RNTI,
Nearly user knows that received remote user data is new data, and the remote user data in should not caching with soft bit merges, simultaneously
Empty the data in the soft bit caching for distributing to remote user.The demodulating process of nearly user is as shown in Figure 6 after application scheme two.
By taking the C-RNTI of nearly user is 1001001100010101 as an example, then obtained after invertingFor
0110110011101010, the corresponding detailed process for scrambling and descrambling is as shown in Figure 7.
In (a) of Fig. 7, when base station eNB sends remote user's new data, using the C-RNTI of nearly user to nearly user's
DCI carries out CRC scrambling, and when nearly user terminal is descrambled successfully using C-RNTI, nearly user knows that transmission is remote user's new data,
The soft bit for emptying remote user is data cached.In (b) of Fig. 7, the remote user of failure is decoded before base station eNB sends nearly user
When data, utilize nearly user'sCRC scrambling is carried out to the DCI of nearly user, is descrambled in nearly user terminal using C-RNTI
Failure utilizesDescramble successfully, nearly user knows that transmission decodes the remote user data to fail before being at this time, will work as
The remote user data stored in the received remote user data of previous frame and soft bit caching merges.
Claims (2)
1. a kind of method for indicating whether soft merging in NOMA, which is characterized in that realized by following one of scheme:
Scheme one: base station increases by 1 bit in the DCI of nearly user, to indicate whether nearly user closes the data of remote user
And；In the scheme one, when base station is matched again dispatches nearly user and remote user, if this time base station is sent to remote user
Data be before nearly user demodulate the legacy data of failure, then the value of base station increased 1 bit in the DCI of nearly user is 1, table
Show that nearly user needs to merge the remote user data received with the remote user data being stored in soft bit caching；If
The newly-increased bit value is 0, then representing this base station and being sent to the information of remote user is not that nearly user demodulates the old of failure before
Data, nearly user does not need to merge the remote user data in soft bit caching, while nearly user empties and distributes to the soft of remote user
Data in bit caching；
Scheme two: whether base station inverts the DCI of the nearly user C-RNTI use when CRC scrambling, to indicate that nearly user is
The no data to remote user merge；In the scheme two, when base station is matched again dispatches nearly user and remote user, such as
The fruit data that this time base station is sent to remote user are that nearly user demodulates the legacy data to fail before, then base station is to nearly user's
When DCI carries out CRC scrambling, using the C-RNTI of the nearly user after reversion, it is denoted asExclusive or is carried out with CRC check position；
If it is not the legacy data that nearly user demodulates failure before that this time base station, which is sent to the data of remote user, base station is to nearly use
When the DCI at family carries out CRC scrambling, exclusive or directly is carried out with the C-RNTI of nearly user and CRC check position；
Wherein, NOMA indicates non-orthogonal multiple access, and DCI indicates that Downlink Control Information, CRC table show cyclic redundancy check, C-
RNTI indicates Cell Radio Network Temporary Identifier/Identity, Cell-RNTI.
2. the method according to claim 1 for indicating whether soft merging in NOMA, which is characterized in that the scheme two
In, when nearly user receives current subframe, use respectivelyWith C-RNTI carry out CRC descrambling, when withDescrambling
When success, nearly user merges the remote user data in current subframe with the remote user data in soft bit caching；When with C-
When RNTI is descrambled successfully, remote user data in nearly user's nonjoinder soft bit caching, while emptying and distributing to the soft of remote user
Data in bit caching.
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| US11196525B2 (en) * | 2018-04-20 | 2021-12-07 | Qualcomm Incorporated | NACK in URLLC |
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| WO2012171224A1 (en) * | 2011-06-17 | 2012-12-20 | 华为技术有限公司 | Scheduling method and device and method and device for processing control information |
| CN104956749A (en) * | 2013-01-29 | 2015-09-30 | 松下电器（美国）知识产权公司 | Base station, terminal, transmission method, and reception method |
| CN105791203A (en) * | 2016-03-09 | 2016-07-20 | 重庆邮电大学 | Non-orthogonal-multiple-access-based downlink signal receiving method |
| CN106454759A (en) * | 2016-12-07 | 2017-02-22 | 海能达通信股份有限公司 | Data processing system, method, device and user equipment and base station |
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|---|---|---|---|---|
| WO2012171224A1 (en) * | 2011-06-17 | 2012-12-20 | 华为技术有限公司 | Scheduling method and device and method and device for processing control information |
| CN104956749A (en) * | 2013-01-29 | 2015-09-30 | 松下电器（美国）知识产权公司 | Base station, terminal, transmission method, and reception method |
| CN105791203A (en) * | 2016-03-09 | 2016-07-20 | 重庆邮电大学 | Non-orthogonal-multiple-access-based downlink signal receiving method |
| CN106454759A (en) * | 2016-12-07 | 2017-02-22 | 海能达通信股份有限公司 | Data processing system, method, device and user equipment and base station |
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