CN103326805B - Precoding determines method and device - Google Patents
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- CN103326805B CN103326805B CN201210073100.8A CN201210073100A CN103326805B CN 103326805 B CN103326805 B CN 103326805B CN 201210073100 A CN201210073100 A CN 201210073100A CN 103326805 B CN103326805 B CN 103326805B
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Abstract
The invention discloses a kind of precoding to determine method and device, and this method includes：Obtain the pattern of the open loop employed in TTI Bundling transmission；Pre-coding matrix is determined according to open loop mode.By the present invention, the method for solving the problems, such as precoding in correlation technique causes the covering performance of system poor, and then improves the effect of system covering performance.
Description
Technical field
The present invention relates to the communications field, and method and device is determined in particular to a kind of precoding.
Background technology
Capacity and covering are two important performance indications in a wireless communication system, more using same in order to increase capacity
Frequency mode networking, but identical frequency process networking adds inter-cell interference again, so as to cause covering performance to decline.
It is descending to employ orthogonal frequency division multiplexing in Long Term Evolution (Long Term Evolution, referred to as LTE) system
(Orthogonal Frequency Division Multiplexing Access, referred to as OFDMA) skill is accessed with multiple access
Art, the interference in cell can be significantly reduced, but due to using identical frequency process networking, inter-cell interference (Inter-Cell more
Interference, referred to as ICI) increase is substantially.In order to reduce ICI, LTE also has standardized many technologies, for example, descending small
Section interference eliminates (Inter-Cell Interfernce Cancellation, referred to as ICIC).Descending ICIC technologies are based on
The method of eNodeB Relative Narrowband TX Power (Relative Narrowband TX Power, referred to as RNTP) limitation is realized
The advance prompting function of descending interference, enhance physical down Traffic Channel (Physical Downlink Shared Channel,
Referred to as PDSCH) covering performance.It is up to employ he Single Carrier-Frequency Division multiple access access (Single Carrier-Frequency
Division Multiplexing Access, referred to as SC-FDMA) technology, UE peak-to-average force ratio can be significantly reduced, improves letter
Number quality, but due to using identical frequency process networking as much, inter-cell interference ICI increases are obvious.In order to reduce ICI, LTE is up
Also many technologies are had standardized, for example, the up ICIC technologies based on HII/OI, enhance Physical Uplink Shared Channel
(Physical Uplink Shared Channel, referred to as PUSCH).
In addition, multiple-input and multiple-output (Multiple Input Multiple Output, referred to as MIMO) technology passes through
Space diversity, spatial reuse and beam forming technique can also improve the covering performance and volumetric properties of LTE system, be particularly based on
Coordinate multipoint (Coordinated Multiple Point, referred to as CoMP) technology that MIMO technology grows up.
Further, channel coding (Channel Coding) technology has significant contribution on link transmission performance is improved, and makes
The various declines of channel can be resisted by obtaining data.
Although the transmission performance that numerous technologies can improve system in LTE system be present, especially network covering property,
At present, test and emulate by Experimental Network and find, the PUSCH of moderate rate, PDSCH the and VoIP business of high-speed is still
It is the channel that covering performance is limited in each channel in LTE system.Wherein main reason is that：UE transmit power is limited to be caused
The PUSCH and VoIP of moderate rate are limited, and the ICI between base station causes the PDSCH of high-speed to be limited.This covers to LTE system
Lid performance boost proposes demand, and Transmission Time Interval (Transmission Time are introduced for this LTE system
Interval, referred to as TTI) binding (Bundling) technology.
TTI Bundling technologies form different redundancy versions, different redundancies to whole packet by channel coding
Version transmits in continuous TTI respectively, and TTI Bundling technologies obtain coding gain by taking more transfer resources
And diversity gain, to obtain higher reception energy and link signal to noise ratio, so as to improve the covering power of LTE system.
But MIMO technology and CoMP technologies depend critically upon measurement and the feedback of channel condition information, wireless system exists
Current and future is interior for a period of time, and measurement and feedback of the terminal (User Equipment, referred to as UE) to wireless channel are still
It is bottleneck, on the one hand feedback gets over complete and accurate, and feedback quantity is bigger, is consumption to capacity, on the other hand for Quick-Change channel, instead
Feedback time delay and the degree of accuracy be difficult ensure, so channel state variations quickly in the case of, heavy dependence feedback closed loop
MIMO technology and CoMP technologies are difficult to obtain larger gain.Even if after employing TTI Bundling, the coverage rate of system still compares
It is relatively low.
The problem of causing the covering performance of system poor for the method for precoding in correlation technique, not yet propose at present
Effective solution.
The content of the invention
The problem of causing the covering performance of system poor for the method for precoding, the invention provides a kind of precoding
Method and device is determined, at least to solve the problem.
According to an aspect of the invention, there is provided a kind of precoding determines method, including：Obtain in Transmission Time Interval
Bundle the pattern of the open loop employed in (TTI Bundling) transmission；Pre-coding matrix is determined according to the open loop mode.
Preferably, the pattern of the open loop includes at least one of：
The pre-coding matrix used in one TTI Bundling multiple TTI is identical or different；
The pre-coding matrix in two time slots in same TTI is identical or different；
The pre-coding matrix that same TTI Bundling re-transmission and first biography use is identical or different；
The pre-coding matrix that two continuous TTI Bunding first biography uses is identical or differs；
The pre-coding matrix set of the open loop is identical with the pre-coding matrix set of closed loop or differs.
Preferably, the precoding used in being one TTI Bundling multiple TTI in the pattern of the open loop
Matrix differs, and the transmitting terminal determines that pre-coding matrix includes according to the open loop mode：
When the number of the TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix, it is determined that
Used by TTI in the TTIBundling index of pre-coding matrix be TTI Bundling in TTI sequence numbers with it is described pre-
If the number of pre-coding matrix carries out the numerical value obtained by modulo operation；
When the number of the TTI in a TTI Bundling is less than the number of the default pre-coding matrix, by such as
Lower formula determines the index PM of pre-coding matrix used by the TTI in the TTI Bundlingi Idx：PMi Idx=mod (mod
(Ni TTI, P) and+i* (floor (P/B) -1), P), wherein, Ni TTIFor the sequence number of i-th of TTI in TTI Bundling, i TTI
The sequence number of i-th of TTI in Bunding, B are TTI Bundling TTI number, and P is default pre-coding matrix
Number, floor are bracket function, and mod is modulo operation.
Preferably, the pattern of the open loop is the precoding square used in one TTI Bundling multiple TTI
Battle array is identical, and the transmitting terminal determines that pre-coding matrix includes according to the open loop mode：
When the number of the TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix, it is determined that
The sequence number that the index of pre-coding matrix is predetermined TTI in TTI Bundling used by TTI in the TTIBundling,
Or the number of transmissions CURRENT_TX_NB of the TTIBundling and the number of default precoding carry out the number obtained by modulo operation
Value；
When the number of the TTI in a TTI Bundling is less than the number of the default pre-coding matrix, by such as
Lower formula determines the index PM of pre-coding matrix used by the TTI in the TTI Bundlingi Idx：PMi Idx=mod (mod
(NTTI, P)+(floor (P/B) -1), P), wherein, NTTIFor the sequence number or the TTI of predetermined TTI in TTI Bundling
Bundling the number of transmissions CURRENT_TX_NB, B is TTI Bundling TTI numbers, and P prelists to be described
The number of code matrix, floor is bracket function.
Preferably, the pattern of the open loop is that the pre-coding matrix in two time slots in same TTI differs, described
Transmitting terminal determines that pre-coding matrix includes according to the open loop mode：
The index PM of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation belowi Idx：
PMi Idx=mod (Ni TTI_SLOT, P), i be TTI Bundling in i-th of time slot, Ni TTI_SLOTFor in TTI Bundling
The sequence number of i-th time slot or, Ni TTI_SLOTDetermined by equation below：CURRENT_TX_NB*2+i mod 2, CURRENT_
TX_NB is TTI Bundling the number of transmissions, and P is the number of default pre-coding matrix.
Preferably, the pre-coding matrix that the re-transmission and first biography that the pattern of the open loop is same TTI Bundling use
Differ, the index RePM of the precoding of the r times re-transmission is determined by equation belowi Idx：RePMi Idx=mod (PMi Idx+ r, P),
Wherein, PMi IdxHeaded by pass and use the corresponding index of precoding, r is number of retransmissions, or, P equal with CURRENT_TX_NB
To preset the number of pre-coding matrix.
Preferably, when TTI Bundling TTI numbers are less than or equal to the number of default pre-coding matrix, institute
The pre-coding matrix that the first biography that the pattern for stating open loop is continuous two TTI Bunding uses is identical.
Preferably, the pattern of the open loop is that two the first of continuous TTI Bunding pass the pre-coding matrix used not
It is identical, determine that second TTI Bundling uses pre-coding matrix in two continuous TTI Bundling by equation below
Index PM2i Idx：PM2i Idx=mod (PM1i Idx+ m, P), wherein, PM1i IdxFor first in two continuous T TI Bundling
TTI Bundling use the index of pre-coding matrix, wherein, B is TTI Bundling TTI number, and P is default
The number of pre-coding matrix, m are the positive integer more than 1 and not equal to P.
Preferably, the pattern of the open loop is the pre-coding matrix set of the open loop and the pre-coding matrix set of closed loop
Differ, determine a pre-coding matrix in the set that the pre-coding matrix is one below：
According to the default 1 pre-coding matrix set A of the pre-coding matrix set of the closed loop, wherein, A is the very sub of B
Collection；
The pre-coding matrix set B used during according to closed loop, N number of pre-coding matrix set is preset, is existed by signal deployment
The set selected in N number of pre-coding matrix set, wherein, N is the positive integer more than 1.
Preferably, the default pre-coding matrix includes at least one of：
The pre-coding matrix set B used during closed loop；
The pre-coding matrix set B used during according to closed loop presets 1 pre-coding matrix set A, wherein, A is the very sub of B
Collection；
The pre-coding matrix set B used during according to closed loop, N number of pre-coding matrix set is preset, is existed by signal deployment
The set selected in N number of pre-coding matrix set, wherein, N is the positive integer more than 1.
According to another aspect of the present invention, there is provided a kind of precoding determining device, including：Acquisition module, for obtaining
The pattern of open loop employed in Transmission Time Interval binding (TTI Bundling) transmission；First determining module, for root
Pre-coding matrix is determined according to the open loop mode.
Preferably, first determining module includes the second determining module and the 3rd determining module：
Second determining module, for the multiple TTI for being one TTI Bundling in the pattern of the open loop
The pre-coding matrix of middle use differs, when the number of the TTI in a TTI Bundling is more than or equal to pre-coding matrix
Number when, the index for determining pre-coding matrix used by the TTI in the TTI Bundling is in TTI Bundling
TTI sequence numbers and the number of the default pre-coding matrix carry out the numerical value obtained by modulo operation；
3rd determining module, for the multiple TTI for being one TTI Bundling in the pattern of the open loop
The pre-coding matrix of middle use differs, when the number of the TTI in a TTI Bundling is less than the default precoding square
During the number of battle array, the index of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation below
PMi Idx：PMi Idx=mod (mod (Ni TTI, P) and+i* (floor (P/B) -1), P), wherein, Ni TTIFor in TTI Bundling
I TTI sequence number, B are TTI Bundling TTI number, and P is the number of default pre-coding matrix, and floor is to take
Integral function, mod are modulo operation.
Preferably, first determining module includes the 4th determining module and the 5th determining module：
4th determining module, the pattern for the open loop are in one TTI Bundling multiple TTI
The pre-coding matrix of use is identical, when the number of the TTI in a TTI Bundling is more than or equal to default pre-coding matrix
Number when, the index for determining pre-coding matrix used by the TTI in the TTI Bundling is in TTI Bundling
Predetermined TTI sequence number, or the number of transmissions CURRENT_TX_NB of the TTI Bundling and the number of default precoding carry out mould
Numerical value obtained by operation；
5th determining module, the pattern for the open loop are in one TTI Bundling multiple TTI
The pre-coding matrix of use is identical, when the number of the TTI in a TTI Bundling is less than the default pre-coding matrix
During number, the index PM of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation belowi Idx：
PMi Idx=mod (mod (NTTI, P)+(floor (P/B) -1), P), wherein, NTTIFor the sequence number of predetermined TTI in TTI Bundling
Or the number of transmissions CURRENT_TX_NB, B of the TTI Bundling are TTI Bundling TTI numbers, P is default
The number of pre-coding matrix, floor are bracket function.
Preferably, first determining module includes the 6th determining module：
6th determining module, the pattern for the open loop are pre- in two time slots in the same TTI
Encoder matrix is differed, and the rope of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation below
Draw PMi Idx：PMi Idx=mod (Ni TTI_SLOT, P), i be TTI Bundling in i-th of time slot, Ni TTI_SLOTFor TTI
The sequence number of i-th of time slot in Bundling or, Ni TTI_SLOTFor CURRENT_TX_NB*2+i mod 2, CURRENT_TX_
NB is the number of transmissions of TTI Bundling transmission blocks, and P is the number of default pre-coding matrix.
Preferably, first determining module includes the 7th determining module：
7th determining module, the re-transmission and first biography that the pattern for the open loop is same TTI Bundling are adopted
Pre-coding matrix is differed, and the index RePM of the precoding of the r times re-transmission is determined by equation belowi Idx：RePMi Idx=
mod(PMi Idx+ r, P), wherein, PMi IdxHeaded by pass and use the corresponding index of precoding, r is equal to number of retransmissions, Huo Zheyu
CURRENT_TX_NB is equal, and P is the number of default pre-coding matrix.
Preferably, first determining module includes the 8th determining module：
8th determining module, the pattern for the open loop use for two continuous TTI Bunding first pass
Pre-coding matrix differ, determine that second TTI Bundling is adopted in continuous two TTI Bundling by equation below
With the index PM2 of pre-coding matrixi Idx：PM2i Idx=mod (PM1i Idx+ m, P), wherein, PM1i IdxFor two continuous T TI
First TTI Bundling uses the index of pre-coding matrix in Bundling, wherein, B is a TTI Bundling
TTI number, P are the number of default pre-coding matrix, and m is the positive integer more than 1 and not equal to P.
By the present invention, precoding square is determined using according to the pattern of the open loop employed in TTI Bundling transmission
Battle array, the method for solving the problems, such as precoding in correlation technique causes the coverage rate of system than relatively low, and then improves system
The effect for coverage rate of uniting.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart that precoding according to embodiments of the present invention determines method；
Fig. 2 is the structured flowchart of precoding determining device according to embodiments of the present invention；
Fig. 3 is the preferable structured flowchart of precoding determining device according to embodiments of the present invention；
Fig. 4 is that TTI Bundling according to embodiments of the present invention first crossing precoding determines the schematic diagram of method；With
And
Fig. 5 be TTI Bundling according to embodiments of the present invention re-transmission in precoding determine method.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
Present embodiments provide a kind of precoding and determine method, Fig. 1 is precoding determination side according to embodiments of the present invention
The flow chart of method, as shown in figure 1, this method includes steps S102 and step S104.
Step S102：Obtain the pattern of the open loop employed in TTI Bundling transmission.
Step S104：Pre-coding matrix is determined according to the open loop mode.
By above-mentioned steps, pre-coding matrix is determined according to the pattern of the open loop employed in TTI Bundling transmission,
The method for solving the problems, such as precoding in correlation technique causes the coverage rate of system than relatively low, and then raising system is covered
The effect of lid rate.
Include the pattern of at least one of as preferably embodiment, a pattern for the open loop：
Pattern one：The pre-coding matrix used in one TTI Bundling multiple TTI is identical or differs.
Pattern two：The pre-coding matrix in two time slots in same TTI is identical or differs.
Pattern three：Same TTI Bundling re-transmission is identical with the first pre-coding matrix for passing use or differs.
Pattern four：The pre-coding matrix that two continuous TTI Bunding first biography uses is identical or differs.
Pattern five：The pre-coding matrix set of open loop is identical with the pre-coding matrix set of closed loop or differs.
Preferably, should when TTI Bundling TTI numbers are less than or equal to the number of default pre-coding matrix
The pattern of open loop can be identical for the pre-coding matrix of continuous two TTI Bunding first biography use.
When implementing, the pre-coding matrix of relative strategy can be determined according to different open loop modes.Below by way of multiple
Example illustrates that pattern corresponding to each example is different.
Example one
In this example, the pre-coding matrix used in open loop mode is a TTI Bundling multiple TTI is not
Identical, the transmitting terminal in step S104 determines that pre-coding matrix includes one below according to open loop mode：
When the number of multiple TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix,
The index for determining pre-coding matrix used by the TTI in TTIBundling be in TTI Bundling TTI sequence numbers with it is default pre-
The number of encoder matrix carries out the numerical value obtained by modulo operation；
When the number of multiple TTI in a TTI Bundling is less than the number of the default pre-coding matrix, pass through
Equation below determines the index PM of pre-coding matrix used by the TTI in the TTI Bundlingi Idx：PMi Idx=mod (mod
(Ni TTI, P) and+i* (floor (P/B) -1), P), i is the sequence number that i is i-th of TTI in TTI Bunding, wherein, Ni TTIFor
The sequence number of i-th of TTI in TTIBundling, B are TTI Bundling TTI numbers, and P is default pre-coding matrix
Number, floor is bracket function, and mod is modulo operation.
Example two
In this example, when the pre-coding matrix phase used in multiple TTI that open loop mode is a TTI Bundling
Together, the transmitting terminal in step S104 determines that pre-coding matrix includes according to open loop mode：
When the number of multiple TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix,
The index for determining pre-coding matrix used by the TTI in the TTI Bundling is predetermined TTI sequence numbers in TTI Bundling,
Or obtained by the number of transmissions CURRENT_TX_NB of the TTI Bundling and the number of default precoding progress modulo operation
Numerical value；
When the number of multiple TTI in a TTI Bundling is less than the number of the pre-coding matrix, by as follows
Formula determines the index PM of pre-coding matrix used by the TTI in the TTI Bundlingi Idx：PMi Idx=mod (mod (NTTI,
P)+(floor (P/B) -1), P), wherein, NTTISequence number or the TTI Bundling for predetermined TTI in TTI Bundling
The number of transmissions CURRENT_TX_NB, B are TTI Bundling TTI numbers, and P is the number of default pre-coding matrix,
Floor is bracket function.
Example three
In this example, when open loop mode be same TTI in two time slots in pre-coding matrix differ, step
Transmitting terminal in S104 determines that pre-coding matrix includes according to open loop mode：Determined by equation below in the TTI Bundling
TTI used by pre-coding matrix index PMi Idx：PMi Idx=mod (Ni TTI_SLOT, P), i is the in TTI Bundling
I time slot, Ni TTI_SLOTSequence number for i-th of time slot in TTI Bundling or, Ni TTI_SLOTDetermined by below equation：
CURRENT_TX_NB*2+i mod 2, CURRENT_TX_NB are the number of transmissions of TTI Bundling transmission blocks, and P is default
The number of pre-coding matrix.
Example four
In this example, when the pre-coding matrix that re-transmission and first biography that open loop mode is same TTI Bundling use
Differ, the transmitting terminal in step S104 determines the index RePM of the precoding of the r times re-transmission by equation belowi Idx：
RePMi Idx=mod (PMi Idx+ r, P), wherein, PMi IdxHeaded by pass and use the corresponding index of precoding, r is number of retransmissions, or
Person is equal with CURRENT_TX_NB, and P is the number of default pre-coding matrix.
Example five
In this example, when the pattern that open loop mode is open loop is that two the first of continuous TTI Bunding pass what is used
Pre-coding matrix differs, and the transmitting terminal in step S104 determines in two continuous TTIBunding by equation below
The index PM2 of pre-coding matrix used by two TTIBundingi Idx：PM2i Idx=mod (PM1i Idx+ m, P), wherein,
PM1i IdxThe index of pre-coding matrix used by for the 1st TTI Bunding in two continuous T TI Bunding, P is default
The number of pre-coding matrix, m are the positive integer more than 1 and not equal to P.
Example six
In this example, when the pattern that open loop mode is open loop is the pre-coding matrix set of open loop and the precoding of closed loop
Set of matrices differs, and the transmitting terminal in step S104 determines that one in the set that the pre-coding matrix is one below prelists
Code matrix：
According to the default 1 pre-coding matrix set A of the pre-coding matrix set of closed loop, wherein, A is B proper subclass；
The pre-coding matrix set B used during according to closed loop, N number of pre-coding matrix set is preset, is existed by signal deployment
The set selected in N number of pre-coding matrix set, wherein, N is the positive integer more than 1.
In order to improve the efficiency of precoding, the set of default pre-coding matrix can be set, the set include it is following at least
One of：The pre-coding matrix set B used during closed loop；The pre-coding matrix set B used during according to closed loop presets 1 precoding
Set of matrices A, wherein, A is B proper subclass；The pre-coding matrix set B used during according to closed loop, preset N number of pre-coding matrix
Set, the set selected by signal deployment in N number of pre-coding matrix set, wherein, N is the positive integer more than 1.
It should be noted that can be in such as one group of computer executable instructions the flow of accompanying drawing illustrates the step of
Performed in computer system, although also, show logical order in flow charts, in some cases, can be with not
The order being same as herein performs shown or described step.
In another embodiment, additionally provide a kind of precoding and determine software, the software is used to perform above-mentioned implementation
Technical scheme described in example and preferred embodiment.
In another embodiment, a kind of storage medium is additionally provided, above-mentioned precoding is stored with the storage medium
Software is determined, the storage medium includes but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..
The embodiment of the present invention additionally provides a kind of precoding determining device, and the precoding determining device can be used in realization
State precoding and determine method and preferred embodiment, carried out explanation, and repeated no more, below the precoding is determined to fill
The module being related in putting illustrates.As used below, term " module " can realize predetermined function software and/or
The combination of hardware.Although system and method described by following examples are preferably realized with software, hardware, or soft
The realization of the combination of part and hardware is also what may and be contemplated.
Fig. 2 is the structured flowchart of precoding determining device according to embodiments of the present invention, as shown in Fig. 2 the device includes：
The determining module 24 of acquisition module 22 and first, said structure is described in detail below.
Acquisition module 22, for obtaining the pattern of the open loop employed in TTI Bundling transmission；First determines mould
Block 24, acquisition module 22 is connected to, the open loop mode for being got according to acquisition module 22 determines pre-coding matrix.
Fig. 3 is the preferable structured flowchart of precoding determining device according to embodiments of the present invention, as shown in figure 3, this
One determining module 24 includes：Second determining module 241, the 3rd determining module 242；4th determining module 243, the 5th determining module
244, the 6th determining module 245, the 7th determining module 246, the 8th determining module 247, said structure is retouched in detail below
State.
Second determining module 241, bundle TTI Bundling's for the pattern in open loop for a Transmission Time Interval
The pre-coding matrix used in multiple TTI differs, and is prelisted when the number of the TTI in a TTI Bundling is more than or equal to
During the number of code matrix, the index for determining pre-coding matrix used by the TTI in TTI Bundling is TTI Bundling
Middle TTI sequence numbers and the number of default pre-coding matrix carry out the numerical value obtained by modulo operation.
3rd determining module 242, TTI Bundling are bundled for a Transmission Time Interval for the pattern in the open loop
Multiple TTI in the pre-coding matrix that uses differ, prelisted when the number of the TTI in a TTI Bundling is less than
During the number of code matrix, the index of pre-coding matrix used by the TTI in TTI Bundling is determined by equation below
PMi Idx：PMi Idx=mod (mod (Ni TTI, P) and+i* (floor (P/B) -1), P), wherein, Ni TTIFor in TTI Bundling
I TTI sequence number, B are TTI Bundling TTI number, and P is the number of default pre-coding matrix, and floor is to take
Integral function, mod are modulo operation.
4th determining module 243, the pattern for the open loop bundle TTI Bundling's for a Transmission Time Interval
The pre-coding matrix used in multiple TTI is identical, is preset in advance when the number of the TTI in a TTI Bundling is more than or equal to
During the number of encoder matrix, the index for determining pre-coding matrix used by the TTI in TTI Bundling is TTI
Predetermined TTI sequence number in Bundling, or the number of transmissions CURRENT_TX_NB of the TTI Bundling and default precoding
Number carries out the numerical value obtained by modulo operation.
5th determining module 244, the pattern for the open loop are pre- to be used in TTI Bundling multiple TTI
Encoder matrix is identical, when the number of the TTI in a TTI Bundling is less than the number of the default pre-coding matrix, passes through
Equation below determines the index PM of pre-coding matrix used by the TTI in TTI Bundlingi Idx：PMi Idx=mod (mod
(NTTI, P)+(floor (P/B) -1), P), wherein, NTTIFor the sequence number or the TTI of predetermined TTI in TTI Bundling
Bundling the number of transmissions CURRENT_TX_NB, B is TTI Bundling TTI numbers, and P is default precoding square
The number of battle array, floor is bracket function.
6th determining module 245：Pattern for the open loop is the pre-coding matrix in two time slots in same TTI
Differ, the index PM of pre-coding matrix used by the TTI in TTI Bundling is determined by equation belowi Idx：PMi Idx
=mod (Ni TTI_SLOT, P), i be TTI Bundling in i-th of time slot, Ni TTI_SLOTFor i-th in TTI Bundling
The sequence number of time slot or, Ni TTI_SLOTPassed for CURRENT_TX_NB*2+i mod 2, CURRENT_TX_NB for TTIBundling
Defeated piece of the number of transmissions, P are the number of default pre-coding matrix.
7th determining module 246, the re-transmission and first biography that the pattern for open loop is same TTI Bundling use
Pre-coding matrix is differed, and the index RePM of the precoding of the r times re-transmission is determined by equation belowi Idx：RePMi Idx=mod
(PMi Idx+ r, P), wherein, PMi IdxHeaded by pass and use the corresponding index of precoding, r is equal to number of retransmissions, Huo Zheyu
CURRENT_TX_NB is equal, and P is the number of default pre-coding matrix.
8th determining module 247, the pattern for the open loop pass the pre- of use for two the first of continuous TTI Bunding
Encoder matrix differs, and determines that second TTI Bundling is using pre- in continuous two TTI Bundling by equation below
The index PM2 of encoder matrixi Idx：PM2i Idx=mod (PM1i Idx+ m, P), wherein, PM1i IdxFor two continuous T TI Bundling
In first TTI Bundling use the index of pre-coding matrix, wherein, B is TTI Bundling TTI number,
P is the number of default pre-coding matrix, and m is the positive integer for being not equal to P more than 1.
Illustrated below in conjunction with preferred embodiment, preferred embodiment below combines above-described embodiment and is preferable to carry out
Mode.
Preferred embodiment one
Present embodiments provide a kind of precoding based on TTI Bundling and determine method, this method comprises the following steps
S202 and step S204.
Step S202：When transmitting terminal is transmitted using TTI Bundling, the determination of precoding uses open loop approach.
Step S204：Receiving terminal sends the specific pattern of open loop in the forward direction transmitting terminal being transmitted, or transmitting terminal exists
Transmit the specific pattern that Forward receiving end sends open loop.
Preferably, the specific pattern of the open loop in step S202 includes the combination of one of following pattern or pattern：
Pattern one；Whether the pre-coding matrix used in any one TTI Bunding multiple TTI is identical,
Pattern two：Whether the pre-coding matrix between two time slots in same TTI is identical.
Pattern three：Whether the pre-coding matrix that same TTI Bundling re-transmission and first biography use is identical.
Pattern four：The pre-coding matrix that two continuous TTI Bunding first biography uses is identical or differs.
Pattern five：Whether the precoding set of open loop is identical with the pre-coding matrix set of closed loop.
Preferably, the transmitting terminal in step S202 is referred to using TTI Bundling transmission：Data are carried out letter by transmitting terminal
Road encodes to obtain different transmitting redundancy editions, and multiple transmitting redundancy editions transmit in continuous multiple TTI, in each TTI
Transmit a redundancy versions.
Preferably, the open loop approach in step S202 refers to, transmitting terminal is not believed by the channel status of the feedback of receiving terminal
Breath determines precoding.
Corresponding to above-mentioned different pattern, the determination of the precoding in step S204 includes in the following manner：
Mode one：When the pre-coding matrix difference used in multiple TTI in any one TTI Bunding：
Select rule for：The sum of TTI sequence numbers and pre-coding matrix carries out modulo operation, obtained number in TTI Bunding
It is worth the index of the pre-coding matrix for use.
I.e.：PMi Idx=mod (Ni TTI, P), i is i-th of the TTI, PM in TTI Bundlingi IdxFor the pre- of i-th TTI
The index of encoder matrix, Ni TTIFor the sequence number of i-th of TTI in TTI Bundling.
Preferably, it is that the index of pre-coding matrix increases a biasing further if B ＜ P：I.e.：PMi Idx=mod
(mod(Ni TTI, P) and+i* (floor (P/B) -1), P), wherein, mono- TTI Bundling of B TTI numbers, P is precoding square
The number of battle array.
Mode two：The pre-coding matrix used in any one TTI Bunding in multiple TTI is different, in addition to,
Two time slots use different pre-coding matrixes in TTI.
That is, PMi Idx=mod (Ni TTI_SLOT, P), i be TTI Bundling in i-th of time slot, PMi IdxFor i-th of time slot
Pre-coding matrix index, Ni TTI_SLOTFor the sequence number of i-th of time slot in TTI Bundling, or, Ni TTI_SLOTFor
CURRENT_TX_NB*2+i mod 2, CURRENT_TX_NB are TTI Bundling the number of transmissions, and P is default precoding
The number of matrix.
Mode three：When the pre-coding matrix used in multiple TTI in any one TTI Bunding is identical.
Select rule for：The number of transmissions of some TTI sequence number or the TTI Bunding blocks in TTI Bunding
The sum of CURRENT_TX_NB and pre-coding matrix carries out modulo operation, and obtained numerical value is the index of the pre-coding matrix used.
I.e.：PMi Idx=mod (Ni TTI, P), i is i-th of the TTI, PM in TTI Bundlingi IdxFor the pre- of i-th TTI
The index of encoder matrix, Ni TTIThe sequence number fixed for some TTI in TTI Bundling, or Ni TTIFor the TTI Bunding
The number of transmissions CURRENT_TX_NB.
Preferably, can be that the index of pre-coding matrix increases a biasing if B ＜ P.
I.e.：PMi Idx=mod (mod (NTTI, P)+(floor (P/B) -1), P).
Preferably, if B ＜=P, continuous TTI the Bunding first pre-coding matrix used that passes are identical, otherwise need
Indicate whether the pre-coding matrix that continuous 2 TTI Bunding first biography uses is identical.
Simultaneous selection rule is not：The TTI Bundling of the 2nd use precoding square in continuous 2 TTI Bundling
Battle array index be：
I.e.：PM2i Idx=mod (PM1i Idx+ m, P), PM2i IdxFor the TTI of the 2nd in continuous 2 TTI Bundling
Bundling uses the index of pre-coding matrix, and m is the positive integer not equal to P, PM1 more than 1i IdxFor continuous 1 TTI
The TTI Bund of the 1st or method phase is determined in Bundling with aforesaid way any one TTI Bundling precoding
Together.
Mode four：The pre-coding matrix that same TTI Bundling re-transmission and first biography use is identical or different.
When different, select rule for：The index of pre-coding matrix of the r times re-transmission is：RePMi Idx=mod (PMi Idx+ r,
P)
It should be noted that r is equal with CURRENT_TX_NB.
Preferably, in the present embodiment, presetting pre-coding matrix set includes at least one of：Using prelisting for closed loop
Code set of matrices, or predefines N number of pre-coding matrix set according to the pre-coding matrix set of closed loop, by signal deployment from
The set selected in N number of pre-coding matrix set.
The method for precoding provided by this preferred embodiment, it is possible to increase the covering performance of system.
Preferred embodiment two
Present embodiments provide a kind of precoding and determine method, Fig. 4 is TTI Bundling according to embodiments of the present invention
First crossing precoding determine the schematic diagram of method, as shown in figure 4, any one TTI Bunding it is first pass and retransmit in all
Comprising 4 TTI, 4 TTI of binding are transmitted, i.e. B=4, and transmit a channel coding version in each TTI, are in figure：
First TTI transmission channel codings version 0, second TTI transmission channel codings version 1, the 3rd TTI transmission channel coding version
Sheet 2, the 4th TTI transmission channel coding version 3.
In the present embodiment, if available pre-coding matrix collection is combined into { X, Y, Z, W }, pre-coding matrix index is used respectively
0,1,2,3 instruction, i.e. number P=4 of pre-coding matrix.
Corresponding to different open loop modes, using different precoding modes.Specifically：
When the pre-coding matrix used in the multiple TTI of first crossing that open loop mode is any one TTI Bunding is different
When,
The index PM of pre-coding matrix is determined by below equationi Idx=mod (NiTTI, P), i are in TTI Bundling
I-th of TTI, PMi IdxFor the index of i-th of TTI pre-coding matrix, Ni TTIFor i-th of TTI's in TTI Bundling
Sequence number；
Specially：If TTI Bundling, 4 TTI sequence number are respectively 20,21,22,23, then：
PM1 Idx=mod (20,4)=0, corresponding pre-coding matrix X；
PM2 Idx=mod (21,4)=1, corresponding pre-coding matrix Y；
PM3 Idx=mod (22,4)=2, corresponding pre-coding matrix Z；
PM4 Idx=mod (23,4)=3, corresponding pre-coding matrix W；
Preferably, can be one biasing of index increase of pre-coding matrix：It is biased to floor (P/B), mono- TTI of B
Bundling TTI numbers, P are the number of pre-coding matrix.Such as：
Floor (B/P)=floor (4/4)=1；
PM1 Idx=mod (mod (20,4)+1* (1-1), 4)=0, corresponding pre-coding matrix Y；
PM2 Idx=mod (mod (21,4)+2* (1-1), 4)=1, corresponding pre-coding matrix Z；
PM3 Idx=mod (mod (22,4)+3* (1-1), 4)=2, corresponding pre-coding matrix W；
PM4 Idx=mod (mod (23,4)+4* (1-1), 4)=3, corresponding pre-coding matrix X；
Preferably, if B ＜=P, continuous TTI the Bunding first pre-coding matrix used that passes are identical, otherwise connect
The first of continuous 2 TTI Bunding passes the pre-coding matrix difference used.
Selection rule under the pattern for：The TTI Bundling of the 2nd are used and prelisted in continuous 2 TTI Bundling
The index PM2 of code matrixi Idx=mod (PM1i Idx+ 1, P), PM2ildx is the 2nd in continuous 2 TTI Bundling
TTIBundling uses the index of pre-coding matrix, PM1i IdxFor the TTI of the 1st in continuous 1 TTI Bundling
Bundling uses the index of pre-coding matrix.
4 illustrate below in conjunction with the accompanying drawings, by taking the first biography of continuous two TTI Bundlig in Fig. 4 as an example, first
TTIBunding PM11 IdxSelection it is described in the manner described above, will not be repeated here.
If：PM11 Idx=0, corresponding pre-coding matrix X；
PM12 Idx=1, corresponding pre-coding matrix Y；
PM13 Idx=2, corresponding pre-coding matrix Z；
PM14 Idx=3, corresponding pre-coding matrix Z.
Then second TTI Bunding PM21 IdxAs described below：
PM21 Idx=mod (PM11Idx+1, P)=1, corresponding pre-coding matrix Y；
PM22 Idx=mod (PM12Idx+1, P)=2, corresponding pre-coding matrix Z；
PM23 Idx=mod (PM13Idx+1, P)=3, corresponding pre-coding matrix W；
PM24 Idx=mod (PM14Idx+1, P)=0, corresponding pre-coding matrix X.
The pre-coding matrix set that the first biographies of i.e. two continuous TTI Bundling use is identical.
Preferably, if B=4, and during P=16, i.e. B ＜ P, then：
First TTI Bunding PM11 IdxSelection it is described in the manner described above, will not be repeated here.
If PM11 Idx=mod (20,16)=4, corresponding pre-coding matrix index are 4；
PM12 Idx=mod (21,16)=5, corresponding pre-coding matrix index are 5；
PM13 Idx=mod (22,16)=6, corresponding pre-coding matrix index are 6；
PM14 Idx=mod (23,16)=7, corresponding pre-coding matrix index are 7.
Then second TTI Bunding PM21 IdxAs described below：
PM21 Idx=mod (PM11Idx+1,16)=5, corresponding pre-coding matrix index are 5；
PM22 Idx=mod (PM12Idx+1,16)=6, corresponding pre-coding matrix index are 6；
PM23 Idx=mod (PM13Idx+1,16)=7, corresponding pre-coding matrix index are 7；
PM24 Idx=mod (PM14Idx+1,16)=8, corresponding pre-coding matrix index are 8.
I.e. two continuous TTI Bundling are first to pass the pre-coding matrix set difference used.
Alternatively, if increase biasing floor (B/P)=floor (16/4)=4,
First TTI Bunding PM11 IdxValue is as follows：
PM11 Idx=mod (mod (20,16)+1* (4-1), 16)=7；
PM12 Idx=mod (mod (21,16)+2* (4-1), 16)=11；
PM13 Idx=mod (mod (21,16)+3* (4-1), 16)=15；
PM14 Idx=mod (mod (23,16)+4* (4-1), 16)=3.
Then second TTI Bunding PM21 IdxValue is as follows：
PM21 Idx=mod (PM11Idx+1,16)=8；
PM22 Idx=mod (PM12Idx+1,16)=12；
PM23 Idx=mod (PM13Idx+1,16)=0；
PM24 Idx=mod (PM14Idx+1,16)=4.
I.e. two continuous TTI Bundling are first to pass the pre-coding matrix set difference used.
Preferred embodiment three
Fig. 5 be TTI Bundling according to embodiments of the present invention re-transmission in precoding determine method, as shown in figure 5,
In the present embodiment, the pre-coding matrix that same TTI Bundling re-transmission and first biography use is identical or different.In difference
When, select rule for：The index of pre-coding matrix of the r times re-transmission is：I.e.：RePMi Idx=mod (PMi Idx+ r, P).
In the present embodiment, during the first re-transmission,
If the index for the pre-coding matrix that head is passed is PM1 Idx=mod (20,16)=4, corresponding pre-coding matrix index are
4；
PM2 Idx=mod (21,16)=5, corresponding pre-coding matrix index are 5；
PM3 Idx=mod (22,16)=6, corresponding pre-coding matrix index are 6；
PM4 Idx=mod (23,16)=7, corresponding pre-coding matrix index are 7；
RePM can then be determinedi Idx=mod (PMi Idx+ 1,16).
It should be noted that the present embodiment can combine the basis of the first various determination methods passed in above preferred embodiment
The upper precoding vectors for determining to retransmit, will not be repeated here.
It should be noted that precoding that can be as follows for the pre-coding matrix set in above preferred embodiment
Set of matrices：
Mode one：Using the pre-coding matrix set of closed loop, such as：
During 2 antenna using table 1 shown in set：
Table 1
During 4 antenna using table 2 shown in set：
Table 2
Mode two：According to the default 1 pre-coding matrix set of the pre-coding matrix set of closed loop.
Such as：
The proper subclass of closed loop precoding set of matrices is combined into using following set (as shown in table 3), the collection during 2 antenna.4 days
Line is similar with 2 antennas, repeats no more.
Table 3
Mode three：N number of pre-coding matrix set is predefined according to the pre-coding matrix set of closed loop, selected by signal deployment
Pre-coding matrix set, in the pre-coding matrix set of selection determine subframe/time slot pre-coding matrix；Such as：
Using 2 (as shown in table 5) of 1 (as shown in table 4) of set and set during 2 antenna：
Table 4
Table 5
Using one in 4 (as shown in table 7) of one or more of 3 (as shown in table 6) of set or set during 4 antenna
It is or multiple：
Table 6
Table 7
Set it should be noted that the transmitting terminal in above preferred embodiment can be base station, Home eNodeB, relay station etc.
Standby or communication terminal, notebook computer, HPC etc..Similarly, receiving terminal is used for the data letter of receiving end/sending end
Number, receiving terminal can be that the control such as the terminal devices such as mobile phone, notebook computer, HPC or base station, relay station is set
It is standby.
Pass through above-described embodiment, there is provided a kind of precoding determines method and device, by using according to TTI
The pattern of open loop employed in Bundling transmission determines pre-coding matrix, and the method for solving precoding in correlation technique is led
The coverage rate of cause system than it is relatively low the problem of, and then improve the effect of system coverage rate.It should be noted that these skills
Art effect is not possessed by above-mentioned all embodiments, and some have the technical effect that some preferred embodiments could obtain
's.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, so as to being stored in
Performed in storage device by computing device, they are either fabricated to each integrated circuit modules respectively or by them
Multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hard
Part and software combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (15)
1. a kind of precoding determines method, it is characterised in that including：
Obtain the pattern of the open loop employed in Transmission Time Interval binding TTI Bundling transmission；
Pre-coding matrix is determined according to the open loop mode；
Wherein, the pattern of the open loop includes at least one of：
The pre-coding matrix used in one TTI Bundling multiple TTI is identical or differs；
The pre-coding matrix in two time slots in same TTI is identical or differs；
Same TTI Bundling re-transmission is identical with the first pre-coding matrix for passing use or differs；
The pre-coding matrix that two continuous TTI Bunding first biography uses is identical or differs；
The pre-coding matrix set of the open loop is identical with the pre-coding matrix set of closed loop or differs.
2. according to the method for claim 1, it is characterised in that in the pattern of the open loop be one TTI
The pre-coding matrix used in Bundling multiple TTI differs, and transmitting terminal determines precoding square according to the open loop mode
Battle array includes：
When the number of the TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix, it is determined that described
The index of pre-coding matrix is that TTI sequence numbers are preset with described in TTI Bundling used by TTI in TTI Bundling
The number of pre-coding matrix carries out the numerical value obtained by modulo operation；
When the number of the TTI in a TTI Bundling is less than the number of the default pre-coding matrix, by following public
Formula determines the index PM of pre-coding matrix used by the TTI in the TTI Bundlingi Idx：PMi Idx=mod (mod
(Ni TTI, P) and+i* (floor (P/B) -1), P), wherein, Ni TTIFor the sequence number of i-th of TTI in TTI Bundling, i TTI
The sequence number of i-th of TTI in Bunding, B are TTI Bundling TTI number, and P is default pre-coding matrix
Number, floor are bracket function, and mod is modulo operation.
3. according to the method for claim 1, it is characterised in that the pattern of the open loop is one TTI Bundling
Multiple TTI in the pre-coding matrix that uses it is identical, transmitting terminal determines that pre-coding matrix includes according to the open loop mode：
When the number of the TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix, it is determined that described
The sequence number that the index of pre-coding matrix is predetermined TTI in TTI Bundling used by TTI in TTI Bundling, or should
TTI Bundling the number of transmissions CURRENT_TX_NB carries out the numerical value obtained by modulo operation with the number of default precoding；
When the number of the TTI in a TTI Bundling is less than the number of the default pre-coding matrix, by following public
Formula determines the index PM of pre-coding matrix used by the TTI in the TTI Bundlingi Idx：PMi Idx=mod (mod (NTTI,
P)+(floor (P/B) -1), P), wherein, NTTISequence number or the TTI Bundling for predetermined TTI in TTI Bundling
The number of transmissions CURRENT_TX_NB, B are TTI Bundling TTI numbers, and P is the number of the default pre-coding matrix
Mesh, floor are bracket function.
4. according to the method for claim 1, it is characterised in that when the pattern of the open loop is two in same TTI
Pre-coding matrix in gap differs, and transmitting terminal determines that pre-coding matrix includes according to the open loop mode：
The index PM of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation belowi Idx：PMi Idx
=mod (Ni TTI_SLOT, P), i be TTI Bundling in i-th of time slot, Ni TTI_SLOTFor i-th in TTI Bundling
The sequence number of time slot or, Ni TTI_SLOTDetermined by equation below：CURRENT_TX_NB*2+i mod 2, CURRENT_TX_NB
For TTI Bundling the number of transmissions, P is the number of default pre-coding matrix.
5. according to the method for claim 1, it is characterised in that the pattern of the open loop is same TTI Bundling's
Retransmit and the first pre-coding matrix used that passes differs, the index of the precoding of the r times re-transmission is determined by equation below
RePMi Idx：RePMi Idx=mod (PMi Idx+ r, P), wherein, PMi IdxHeaded by pass use and index corresponding to precoding, r is re-transmission
Number, or it is equal with CURRENT_TX_NB, and P is the number of default pre-coding matrix.
6. according to the method for claim 1, it is characterised in that when TTI Bundling TTI numbers are less than or wait
When the number of default pre-coding matrix, the pattern of the open loop is that the first of continuous two TTI Bunding passes the pre- of use
Encoder matrix is identical.
7. according to the method for claim 1, it is characterised in that the pattern of the open loop is two continuous TTI
The Bunding first pre-coding matrix used that passes differs, and is determined by equation below in two continuous TTI Bundling
Second TTI Bundling uses the index PM2 of pre-coding matrixi Idx：PM2i Idx=mod (PM1i Idx+ m, P), wherein,
PM1i IdxThe index of pre-coding matrix is used for first TTI Bundling in two continuous T TI Bundling, wherein, B is
One TTI Bundling TTI number, P are the number of default pre-coding matrix, and m is more than 1 and just whole not equal to P
Number.
8. according to the method for claim 1, it is characterised in that the pattern of the open loop is the pre-coding matrix of the open loop
Gather the pre-coding matrix set with closed loop to differ, determine that the pre-coding matrix is pre- for one in the set of one below
Encoder matrix：
According to the default 1 pre-coding matrix set A of the pre-coding matrix set of the closed loop, wherein, A is B proper subclass；
The pre-coding matrix set B used during according to closed loop, N number of pre-coding matrix set is preset, by signal deployment in the N
The set selected in individual pre-coding matrix set, wherein, N is the positive integer more than 1.
9. the method according to any one of claim 2 to 7, it is characterised in that the default pre-coding matrix include with
It is at least one lower：
The pre-coding matrix set B used during closed loop；
The pre-coding matrix set B used during according to closed loop presets 1 pre-coding matrix set A, wherein, A is B proper subclass；
The pre-coding matrix set B used during according to closed loop, N number of pre-coding matrix set is preset, by signal deployment in the N
The set selected in individual pre-coding matrix set, wherein, N is the positive integer more than 1.
A kind of 10. precoding determining device, it is characterised in that including：
Acquisition module, for obtaining the pattern of the open loop employed in Transmission Time Interval binding TTI Bundling transmission；
First determining module, for determining pre-coding matrix according to the open loop mode；
Wherein, the pattern of the open loop includes at least one of：
The pre-coding matrix used in one TTI Bundling multiple TTI is identical or differs；
The pre-coding matrix in two time slots in same TTI is identical or differs；
Same TTI Bundling re-transmission is identical with the first pre-coding matrix for passing use or differs；
The pre-coding matrix that two continuous TTI Bunding first biography uses is identical or differs；
The pre-coding matrix set of the open loop is identical with the pre-coding matrix set of closed loop or differs.
11. device according to claim 10, it is characterised in that first determining module include the second determining module and
3rd determining module：
Second determining module, in the pattern of the open loop be TTI Bundling multiple TTI in use
Pre-coding matrix differs, when the number of the TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix
During mesh, the index for determining pre-coding matrix used by the TTI in the TTI Bundling is TTI sequences in TTI Bundling
The numerical value obtained by modulo operation number is carried out with the number of the default pre-coding matrix；
3rd determining module, for the pattern of the open loop be one TTI Bundling multiple TTI in adopt
Pre-coding matrix differs, when the number of the TTI in a TTI Bundling is less than the default pre-coding matrix
During number, the index PM of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation belowi Idx：
PMi Idx=mod (mod (Ni TTI, P) and+i* (floor (P/B) -1), P), wherein, Ni TTIFor i-th of TTI in TTI Bundling
Sequence number, B is TTI Bundling TTI number, and P is the number of default pre-coding matrix, and floor is rounds letter
Number, mod is modulo operation.
12. device according to claim 10, it is characterised in that first determining module include the 4th determining module and
5th determining module：
4th determining module, the pattern for the open loop are pre- to be used in TTI Bundling multiple TTI
Encoder matrix is identical, when the number of the TTI in a TTI Bundling is more than or equal to the number of default pre-coding matrix,
Indexing for pre-coding matrix is predetermined TTI in TTI Bundling used by determining the TTI in the TTI Bundling
Sequence number, or the number of transmissions CURRENT_TX_NB of the TTI Bundling and the number of default precoding are carried out obtained by modulo operation
The numerical value arrived；
5th determining module, the pattern for the open loop are to be used in one TTI Bundling multiple TTI
Pre-coding matrix it is identical, when the TTI in a TTI Bundling number be less than the default pre-coding matrix number
When, the index PM of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation belowi Idx：PMi Idx
=mod (mod (NTTI, P)+(floor (P/B) -1), P), wherein, NTTISequence number for predetermined TTI in TTI Bundling should
TTI Bundling the number of transmissions CURRENT_TX_NB, B is TTI Bundling TTI numbers, and P is to prelist
The number of code matrix, floor is bracket function.
13. device according to claim 10, it is characterised in that first determining module includes the 6th determining module：
6th determining module, the pattern for the open loop are the pre-coding matrix in two time slots in same TTI
Differ, the index PM of pre-coding matrix used by the TTI in the TTI Bundling is determined by equation belowi Idx：
PMi Idx=mod (Ni TTI_SLOT, P), i be TTI Bundling in i-th of time slot, Ni TTI_SLOTFor in TTI Bundling
The sequence number of i-th time slot or, Ni TTI_SLOTFor CURRENT_TX_NB*2+i mod 2, CURRENT_TX_NB TTI
The number of transmissions of Bundling transmission blocks, P are the number of default pre-coding matrix.
14. device according to claim 10, it is characterised in that first determining module includes the 7th determining module：
7th determining module, the re-transmission and first biography that the pattern for the open loop is same TTI Bundling use
Pre-coding matrix is differed, and the index RePM of the precoding of the r times re-transmission is determined by equation belowi Idx：RePMi Idx=mod
(PMi Idx+ r, P), wherein, PMi IdxHeaded by pass and use the corresponding index of precoding, r is equal to number of retransmissions, Huo Zheyu
CURRENT_TX_NB is equal, and P is the number of default pre-coding matrix.
15. device according to claim 10, it is characterised in that first determining module includes the 8th determining module：
8th determining module, the pattern for the open loop pass the pre- of use for two the first of continuous TTI Bunding
Encoder matrix differs, and determines that second TTI Bundling is using pre- in continuous two TTI Bundling by equation below
The index PM2 of encoder matrixi Idx：PM2i Idx=mod (PM1i Idx+ m, P), wherein, PM1i IdxFor two continuous T TI Bundling
In first TTI Bundling use the index of pre-coding matrix, wherein, B is TTI Bundling TTI number,
P is the number of default pre-coding matrix, and m is the positive integer more than 1 and not equal to P.
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| LTE下行链路MIMO预编码技术研究;朱瑞茂;《中国科技论文在线》;20090521;第1-7页 * |
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