CN101827393A - Mapping method for physical hybrid retransmission indicator channel - Google Patents

Abstract

The invention provides a mapping method for a physical hybrid retransmission indicator channel. An offset is added on the lowest index of a physical resource block allocated by an uplink resource when the mapping of the physical hybrid retransmission indicator channel (PHICH) is carried out in the uplink span carrier dispatching. The method can alleviate the problem of PHICH resource conflict during the span carrier dispatching; and the relevant parameters of DMRS in the mapping formula of the physical hybrid retransmission indicator channel in the multiple input multiple output (MIMO) scene are defined.

Description

Mapping method of physical hybrid retransmission indication channel

Technical Field

The invention relates to the field of digital communication, in particular to a specific implementation method of physical hybrid retransmission channel mapping in a carrier aggregation or multi-antenna uplink transmission scene.

Background

The Long Term Evolution (LTE) system is an important project for the third generation partnership. When the LTE system employs a Normal Cyclic Prefix (Normal Cyclic Prefix), one slot includes uplink/downlink symbols with a length of 7, and when the LTE system employs an Extended Cyclic Prefix (Extended Cyclic Prefix), one slot includes uplink/downlink symbols with a length of 6.

Fig. 1 is a schematic diagram of an LTE system physical Resource Block with a bandwidth of 5MHz according to the related art, and as shown in fig. 1, one Resource Element (RE) is one subcarrier in one OFDM symbol, and one downlink Resource Block (RB) is composed of 12 consecutive subcarriers and 7 consecutive (6 when a cyclic prefix is extended) OFDM symbols. One resource block is 180kHz in frequency domain and a time length of a general time slot in time domain, and when resource allocation is performed, the resource block is allocated as a basic unit. In the Uplink subframe, a Physical Uplink Control Channel (PUCCH) is located on two side bands of the whole frequency band, and the middle of the PUCCH is used for transmitting a Physical Uplink Shared Channel (PUSCH), and the Channel is used for carrying Uplink data.

In the LTE system, several physical channels are defined as follows:

physical Broadcast Channel (PBCH): the information carried by the channel includes a frame number of the system, a downlink bandwidth of the system, a period of a Physical hybrid retransmission channel, and a parameter N for determining a number of channel groups of a Physical hybrid ARQ indicator channel (PHICH for short)_g∈{1/6，1/2，1，2}。

Physical downlink control channel (PDCCH for short): the method is used for bearing uplink and downlink scheduling information and uplink power control information.

Downlink Control Information (DCI) formats (formats) are classified into the following: DCI format 0, l, 1A, 1B, 1C, 1D, 2A, 3A, and the like, where the format 0 is used to indicate scheduling of a Physical Uplink Shared Channel (PUSCH); the DCI format 1, 1A, 1B, 1C, 1D is used for different transmission modes of a Physical Downlink Shared Channel (PDSCH) of a single transport block; DCI format 2, 2A is used for different transmission modes of space division multiplexing; the DCI format 3, 3A is used for transmission of a Physical Uplink Control Channel (PUCCH) and a power control command of the PUSCH.

Physical uplink shared channel: for carrying uplink transmission data. Control information such as resource allocation, modulation and coding scheme, and Cyclic Shift (CS) of Demodulation Reference Signal (DMRS) for the channel is set in DCI format 0 for uplink grant (ul grant).

Physical Hybrid ARQ Indicator Channel (PHICH for short): and the ACK/NACK feedback information is used for carrying uplink transmission data. The number and duration (duration) of the PHICH channel groups are determined by system messages in the PBCH of the located downlink carrier, and the time-frequency position of the PHICH is determined by the number and duration of the PHICH channel groups, the antenna configuration of the cell PBCH, the cell ID, the group number of the PHICH and the sequence index in the group.

For frame structure 1(FDD frame structure), the number N of PHICH groups_PHICH ^groupDetermined by the following equation (a):

formula (a)

N_gThe epsilon {1/6, 1/2, 1, 2} is determined by the system information in PBCH of the located Downlink carrier (DL carrier), and the group number n of PHICH_PHICH ^groupFrom 0 to N_PHICH ^group-1 number;

N_RB ^DLis the bandwidth of the downlink carrier where the PHICH is located.

For frame structure 2(TDD frame structure), the number of PHICH groups is m per subframe_i·N_PHICH ^groupWherein m is_iAs determined by table 1 below.

TABLE 1

PHICH resource composed of (n)_PHICH ^group，n_PHICH ^seq) Determination of n_PHICH ^groupIs the group number of the PHICH, n_PHICH ^seqIs an index of the orthogonal sequences in the set, determined by the following equation (b):

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

n_DMRSthe parameter is a dynamic cyclic shift parameter of a Demodulation reference signal (DMRS) defined in the DCI format 0, and the parameter is configured to cause different cyclic shifts between MU-MIMO users in a cell, so that the MU-MIMO users in the cell are orthogonal to each other, and intra-cell interference is suppressed. The configuration of this parameter is described in table 2 below.

TABLE 2

DMRS dynamic cyclic shift parameter n in DCI format 0DMRS (2)	Actual dynamic cyclic shift amount
		000	0
001	6
		010	3

011	4
		100	2
101	8
		110	10
111	9

N_SF ^PHICHIs the spreading factor of PHICH modulation, for normal CP, $N_{\mathrm{SF}}^{\mathrm{PHICH}}=4,$ the extended CP is used to extend the CP,

$N_{\mathrm{SF}}^{\mathrm{PHICH}}=2.$

I_{PRB_RA} ^lowest_indexis the lowest index of a Physical Resource Block (PRB) allocated by uplink resources;

the LTE Release-8 uplink only allows single antenna transmission. N in the formula (b)_DMRSFor the UE, only 1 DCI format 0 is configured.

Sequence design of PUSCH DMRS, time-frequency extension of DMRS sequence:

<math><mrow><msup><mi>r</mi><mi>PUSCH</mi></msup><mrow><mo>(</mo><mi>m</mi><mo>&CenterDot;</mo><msubsup><mi>M</mi><mi>sc</mi><mi>RS</mi></msubsup><mo>+</mo><mi>n</mi><mo>)</mo></mrow><mo>=</mo><msubsup><mi>r</mi><mrow><mi>u</mi><mo>,</mo><mi>v</mi></mrow><mrow><mo>(</mo><mi>&alpha;</mi><mo>)</mo></mrow></msubsup><mrow><mo>(</mo><mi>n</mi><mo>)</mo></mrow></mrow></math>

m＝0，1

$n=0,...,M_{\mathrm{sc}}^{\mathrm{RS}}-1$

$M_{\mathrm{sc}}^{\mathrm{RS}}=M_{\mathrm{sc}}^{\mathrm{PUSCH}}$

α＝2πn_cs/12

$n_{\mathrm{cs}}=(n_{\mathrm{DMRS}}^{\left(1\right)}+n_{\mathrm{DMRS}}^{\left(2\right)}+n_{\mathrm{PRS}}\left(n_s\right))\mathrm{mod}12$

m＝n_smod2, where m is 0 and 1 corresponds to the first and second slots of each subframe, respectively. And the total 12 cyclic shift values are adopted, and the bandwidth of the PUSCH DMRS is the same as that of the PUSCH.

Cyclic shift n of DMRS sequence_csThe three parameters are used for determination, and are specifically described as follows:

n_DMRS ⁽¹⁾: the high-level parameters are used for determining (3 bits), semi-static configuration is carried out, different cells have different cyclic shifts, MU-MIMO users among the cells are orthogonal, and inter-cell interference is suppressed.

n_DMRS ⁽²⁾: the latest DCI format 0 provides (3 bits) (see table 2), and the cyclic shifts are dynamically configured to be different between MU-MIMO users in a cell, so that the MU-MIMO users in the cell are orthogonal to each other, thereby suppressing intra-cell interference. n is_DMRS ⁽²⁾May be referred to as dynamic cyclic shift parameters.

n_PRS(n_s): by cell identity number N_ID ^cell(Identity, abbreviated as ID) and Δ_ssThe decision, the variables based on the slot hopping are:

<math><mrow><msub><mi>n</mi><mi>PRS</mi></msub><mrow><mo>(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>)</mo></mrow><mo>=</mo><msubsup><mi>&Sigma;</mi><mrow><mi>i</mi><mo>=</mo><mn>0</mn></mrow><mn>7</mn></msubsup><mi>c</mi><mrow><mo>(</mo><mn>8</mn><msubsup><mi>N</mi><mi>symb</mi><mi>UL</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>s</mi></msub><mo>+</mo><mi>i</mi><mo>)</mo></mrow><mo>&CenterDot;</mo><msup><mn>2</mn><mi>i</mi></msup><mo>,</mo></mrow></math>

f_ss ^PUSCHis defined as: <math><mrow><msubsup><mi>f</mi><mi>ss</mi><mi>PUSCH</mi></msubsup><mo>=</mo><mrow><mo>(</mo><msubsup><mi>f</mi><mi>ss</mi><mi>PUCCH</mi></msubsup><mo>+</mo><msub><mi>&Delta;</mi><mi>ss</mi></msub><mo>)</mo></mrow><mi>mod</mi><mn>30</mn><mo>,</mo></mrow></math> $f_{\mathrm{ss}}^{\mathrm{PUCCH}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}30,$

wherein Δ_ssE {0, 1, …, 29} is configured by higher layers.

The Long-Term Evolution Advanced (LTE-A) system is an Evolution version of LTE Release-8. Backward compatibility is required in the advanced international wireless communication system requirements set forth by the international telecommunications union radio communication group. The requirement of backward compatibility between LTE-Advanced and LTE Release-8 refers to that: the terminal of LTE Release-8 can work in an LTE-Advanced network; the terminal of LTE-Advanced can work in the network of LTE Release-8. In addition, LTE-Advanced should be able to operate with different size spectrum configurations, including wider spectrum configurations (e.g., 100MHz contiguous spectrum resources) than LTE Release-8, to achieve higher performance and target peak rates. In consideration of compatibility with LTE Release-8, for a bandwidth greater than 20MHz, a spectrum aggregation (Carrier aggregation) manner, that is, two or more component carriers (component carriers) are aggregated to support a downlink transmission bandwidth greater than 20MHz, is adopted.

The LTE-a system supports cross-Carrier scheduling (cross-Carrier scheduling), where in the same downlink subframe, there may be a case where one downlink component Carrier schedules N UL component carriers, and each of the N scheduled DCIs includes a 3-bit component Carrier Indicator Field (CIF). If the resource mapping method of R8 is completely used, the PRB index of each CC and the dynamic cyclic shift parameter n of DMRS are used_DMRS ⁽²⁾As may be the case, resource conflicts are easily caused, so new solutions are needed. When the dynamic scheduling is carried out, namely when the DCI scheduling is carried out, the conflict can be realized by adjusting the dynamic cyclic shift parameter n of the DMRS_DMRS ⁽²⁾The solution is that. Semi-Persistent Scheduling (SPS), dynamic cyclic shift parameter n_DMRS ⁽²⁾Is fixed, if the PRB index of each CC is the same, resource collision is inevitable. Therefore, in order to solve the problem of PHICH resource collision in cross-carrier scheduling, a standardized scheme is still needed to solve. The solution to the PHICH resource collision problem discussed so far is as follows:

the method comprises the following steps: the existing CS mechanism is used to avoid collisions by adjusting the dynamic cyclic shift parameters of DMRS in the DCI signaling.

The second method comprises the following steps: carrier specific default values (Carrier specific offset) are set to avoid collisions by using different default values for each CC scheduled across carriers.

The third method comprises the following steps: the uplink carriers are continuously numbered (Serial number of UL carriers), i.e. PRBs of the uplink carriers are continuously numbered to avoid collision.

The first method does not need to be standardized again, the third method is equivalent to a special case of the second method, when PHICH resources reserved by the DL CC are few (for example, Ng is 1), the PHICH resource conflict problem cannot be solved obviously, and when PHICH resources reserved by the DL CC are many (for example, Ng is 2), the third method can solve the PHICH resource conflict problem to a large extent. Optimization of the solution may consider PRB shifting on the basis of method three.

A terminal in the LTE-a system can simultaneously Transmit one or more component carriers according to its capability, and uplink may adopt a single-user multi-antenna transmission technique, including Transmit Diversity (TxD) and spatial multiplexing (MIMO). At most 2 codeword streams are simultaneously transmitted on each component carrier, and the mapping rule of correct Acknowledgement/Negative Acknowledgement (ACK/NACK) information of the 2 codeword streams needs to be standardized. A layer mapping (code to layer mapping) rule of an uplink Codeword stream and a downlink layer mapping rule, and fig. 2 is a schematic diagram of layer mapping of an LTE-a uplink Codeword stream according to the related art.

In the related art, the uplink scheduling DCI format 0 does not support uplink multi-antenna transmission, in an LTE-a uplink multi-antenna transmission scenario, the uplink scheduling DCI needs to add a new format, which is temporarily referred to as DCIformat X, and if the DCI format X is used to configure appropriate DMRS cyclic shift related parameters for each layer (layer) of the UE, and 3 bits are allocated according to each cyclic shift amount, signaling overhead is relatively large, for example, 4 layers are used for transmission, and each layer is configured with one 3-bit DM RS cyclic shift parameter, and then 12-bit signaling is needed. It is contemplated that these 12 bits may be compressed into 2 bits or 3 bits, with each particular signaling value corresponding to a set of dynamic cyclic shift amounts. How to use the compressed dynamic cyclic shift parameters for PHICH mapping needs to be standardized, and in order to make PHICH resource mapping compatible with LTE as much as possible, the corresponding relationship between the dynamic cyclic shift parameters of the LTE-a demodulation reference signal and the actual cyclic shift amount still needs to follow the LTE scheme (table 2) in some cases.

In a MIMO scenario, DMRS time domain Orthogonal code (OCC) may be introduced, that is, (1, 1) or (1, -1) is adopted to improve orthogonality between terminals over 2 RS symbols of a slot. If the same dynamic cyclic shift amount is adopted by the terminal in the MU-MIMO scene, the PHICH mapping needs to be redefined. Fig. 3 is a schematic diagram of uplink 4-antenna 4-layer transmission and OCC code adoption in a MIMO scenario.

To sum up, the PHICH resource conflict resolution needs to be optimized in the cross-carrier scheduling scenario, and the PHICH resource mapping mode needs to be standardized in the MIMO scenario. The invention provides a specific implementation scheme based on the two points.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a mapping method of a physical hybrid retransmission indicator channel, which alleviates the problem of PHICH resource conflict during cross-carrier scheduling.

In order to solve the above problem, the present invention provides a mapping method for a physical hybrid retransmission indicator channel, which includes: when physical hybrid retransmission indicator channel (PHICH) mapping is carried out in uplink cross-carrier scheduling, an offset is added to the lowest index of a physical resource block allocated by uplink resources.

Further, the method also has the following characteristics:

the offset is the product of the component carrier index i and the default value k.

Further, the method also has the following characteristics:

the default value k is one of a plurality of predefined default values configured by high-layer signaling, or the default value k takes the value ofOrp represents the maximum or minimum bandwidth of the uplink component carrier which can be scheduled by the user equipment on the downlink component carrier where the downlink control information of the current uplink scheduling is located, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the downlink control information of the current uplink scheduling is located; n represents the uplink branch of the current user equipment which can be scheduled by the downlink component carrier where the downlink control information of the current uplink scheduling isThe number of the component carriers is,

a rounding-down operation is indicated and,

indicating a rounding up operation.

Further, the method also has the following characteristics:

the physical resource blocks of the uplink component carriers which are currently scheduled by the user equipment are shifted, then the physical resource blocks of all the uplink component carriers which can be scheduled on the current downlink component carriers of the user equipment are cascaded and are numbered continuously, and the resources of the physical hybrid retransmission indicating channels in the downlink component carriers are determined according to the indexes of the physical resource blocks in the rearranged uplink component carriers, wherein the shifting is right shifting, circular left shifting or circular right shifting.

Further, the method also has the following characteristics:

the physical resource blocks of each uplink component carrier which can be scheduled on the current downlink component carrier of the user equipment are cascaded and numbered continuously, then the physical resource blocks of the uplink component carriers which can be scheduled by the user equipment are wholly shifted, and the resources of the physical hybrid retransmission indication channel in the downlink component carrier are determined according to the indexes of the physical resource blocks in the rearranged uplink component carrier.

Further, the method also has the following characteristics:

when PHICH resource mapping is carried out on a component carrier i, all component carriers with component carrier indexes not larger than i are cascaded from low to high according to the indexes, and a physical resource block is shifted on the whole i +1 component carriers, wherein the shifting is right shifting, circular left shifting or circular right shifting.

Further, the method also has the following characteristics:

according to one of the following modes, the physical resource blocks of each uplink component carrier which can be scheduled currently by the user equipment are cascaded and numbered continuously: numbering physical resource blocks of uplink component carriers matched with downlink component carriers where downlink control information of current uplink scheduling is located according to the numbering mode of a long-term evolution system, cascading the physical resource blocks of other uplink component carriers which can be scheduled on the current downlink component carriers, and uniformly and continuously numbering according to the frequency from high to low or from low to high; or, cascading physical resource blocks of each uplink component carrier which can be scheduled on the current downlink component carrier of the user equipment, and numbering continuously according to the frequency from high to low or from low to high.

Further, the method also has the following characteristics:

the shift amount at the time of shift can be obtained in one of the following ways:

1) the predefined value is: p represents the maximum or minimum bandwidth of the uplink component carrier which can be scheduled by the user equipment on the downlink component carrier where the downlink control information of the current uplink scheduling is located, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the downlink control information of the current uplink scheduling is located; n represents the number of uplink component carriers of the current user equipment which can be scheduled by the downlink component carrier where the downlink control information of the current uplink scheduling is located, if the index of the uplink component carrier is i, the shift amount is

Or

Or

Or

Or

Or

Wherein p is_iThe number of physical resource blocks corresponding to the uplink component carrier i;

a rounding-down operation is indicated and,

represents a rounding up operation;

2) the amount of shift is configured by higher layer signaling, in particular one of a plurality of predefined values configured by higher layer signaling.

Further, the method also has the following characteristics:

the component carrier index i is one of the following values:

1) the value of the component carrier indication field in the current uplink scheduling downlink control information format of the user equipment;

2) a component carrier index specific to a high-level configured user equipment;

3) a predefined component carrier index, the predefined manner being one of:

the index of the uplink component carrier matched with the component carrier where the downlink control information of the current uplink scheduling of the user equipment is located is 0, and the indexes of other uplink component carriers which can be scheduled by cross-carrier on the current downlink component carrier of the user equipment are continuously numbered according to the frequency from high to low or from low to high; or,

the user equipment carries out continuous numbering according to the frequency from high to low or from low to high on the indexes of all the uplink component carriers which can be scheduled on the current downlink component carrier.

In order to solve the above technical problem, the present invention further provides a mapping method for a physical hybrid retransmission indicator channel: in an uplink multi-antenna scene, a group or one demodulation reference signal dynamic cyclic shift amount is allocated to user equipment in a downlink control information format, and when a base station sends uplink data confirmation or non-confirmation information through physical hybrid retransmission indicator channel (PHICH) information, a demodulation reference signal dynamic cyclic shift parameter n in physical hybrid retransmission indicator channel resource mapping is determined according to signaling in the downlink control information_DMRS。

Further, the method also has the following characteristics:

when the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 2 bits and the time domain orthogonal code enabling information or the index information occupies 1 bit simultaneously, if the scheduled component carrier only sends 1 code stream, the 3-bit information is directly used as the dynamic cyclic shift parameter n of the demodulation reference signal in the physical hybrid retransmission indication channel mapping_DMRS。

Further, the method also has the following characteristics:

the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 3 bits, and when the time domain orthogonal code enabling information or the index information occupies 1 bit, the dynamic cyclic shift parameter n of the demodulation signal in the PHICH resource mapping_DMRSSelecting one of the following modes:

directly using the 4-bit information as a demodulation reference signal dynamic cyclic shift parameter n in PHICH mapping_DMRSEither the first or the second substrate is, alternatively,

when the time domain orthogonal code enabling information is not enabled or the time domain orthogonal code index information is (1, 1), directly using the 3 bits of information as a demodulation reference signal dynamic cyclic shift parameter n in PHICH mapping_DMRS(ii) a When the time domain orthogonal code enable information is enabled or the time domain orthogonal code index information is (1, -1), according to the part in the 3 bits of informationDemodulation reference signal dynamic cyclic shift parameter n in PHICH mapping corresponding to state _DMRS2, demodulation reference signal dynamic cyclic shift parameter n in PHICH mapping corresponding to other states_DMRS＝7。

Further, the method also has the following characteristics:

the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 3 bits, and if the scheduled component carrier only sends 1 code stream, the 3 bits of information are directly used as the dynamic cyclic shift parameter n of the demodulation reference signal in the physical hybrid retransmission indication channel mapping_DMRS。

Further, the method also has the following characteristics:

the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 2 bits or 3 bits, if the scheduled component carrier only sends 2 code word streams, the physical hybrid retransmission indicating channel resources of the 2 code word streams are bound, only one piece of confirmation or non-confirmation information is fed back, and the 2 bits or 3 bits of information are directly used as the dynamic cyclic shift parameter n of the demodulation reference signal in the physical hybrid retransmission indicating channel mapping_DMRS。

The invention can relieve the PHICH resource conflict problem during cross-carrier scheduling and provides that DMRS related parameters in a mapping formula of a physical hybrid retransmission channel are defined under an MIMO scene.

Drawings

FIG. 1 is a schematic diagram of an LTE system physical resource block with a bandwidth of 5 MHz;

FIG. 2 is a schematic diagram of layer mapping for an LTE-A uplink codeword stream;

fig. 3 is a schematic diagram of uplink 4-antenna 4-layer transmission and OCC code adoption in a MIMO scenario;

FIG. 4 is a schematic diagram of a first method in an embodiment;

fig. 5 is a schematic diagram of a third embodiment.

Detailed Description

The PHICH resource conflict problem solution under uplink cross-carrier scheduling has various advantages and disadvantages at present. In the ul mimo scenario, a PHICH resource mapping method corresponding to a component carrier used by a user for uplink transmission has not been discussed yet. The invention provides several optimization schemes for solving the PHICH resource conflict problem and defines DMRS related parameters in a PHICH resource mapping formula under the ULMIMO scene.

The optimization scheme of the PHICH resource conflict problem is as follows:

when one downlink component carrier simultaneously schedules multiple UL component carriers of a UE, i.e. in a UL cross-carrier scheduling scenario, the PHICH resource conflict solution may employ an offset added to a PRB index, and the offset adding manner includes the following 2 methods, which are described as follows:

the method comprises the following steps: as shown in fig. 4, when physical hybrid retransmission indicator channel (PHICH) mapping is performed in uplink cross-carrier scheduling, an offset is added to the lowest index of the physical resource block of the uplink resource allocation.

Adding an offset to the PRB index in the PHICH resource mapping formula, wherein the offset is the product of the component carrier index i and the default value k. The concrete PHICH resource mapping formula is as follows:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+\mathrm{ik}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

wherein,

a rounding-down operation is indicated and,indicating a rounding up operation.

The offset is ik, i denotes the component carrier index, and k denotes a default value.

The component carrier index i is one of the following values:

1) the value of the component carrier indication field in the current uplink scheduling downlink control information format of the user equipment;

2) a component carrier index specific to a high-level configured user equipment;

3) a predefined component carrier index, the predefined manner being one of:

the index of the uplink component carrier matched with the component carrier where the downlink control information of the current uplink scheduling of the user equipment is located is 0, and the indexes of other uplink component carriers which can be scheduled by cross-carrier on the current downlink component carrier of the user equipment are continuously numbered according to the frequency from high to low or from low to high; or, indexes of all currently scheduled uplink component carriers of the user equipment are numbered sequentially according to the frequency from high to low or from low to high.

Further, the default value k is UE-specific and can be obtained by one of the following 2 ways:

(1) one of a plurality of predefined default values configured by the higher layer signaling may be implemented as follows: predefining 4 default values, and indicating to select one of the 4 default values by 2-bit signaling, wherein the high-layer signaling may configure 2 bits for each UL component carrier of the UE that can be cross-carrier scheduled, and the total overhead is 2 × (n-1) bits, where n is the number of UL component carriers of the UE that can be cross-carrier scheduled. Or all UL component carriers that can be scheduled across carriers of the UE share a default value, and the high layer signaling overhead is 2 bits.

(2) The default value k takes the value of

Or

p represents the maximum or minimum bandwidth of the uplink component carrier which can be scheduled by the user equipment on the downlink component carrier where the downlink control information of the current uplink scheduling is located, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the downlink control information of the current uplink scheduling is located; n represents the number of uplink component carriers of the current user equipment which can be scheduled by the downlink component carrier where the downlink control information of the current uplink scheduling is located.

The second method comprises the following steps:

the physical resource blocks of the uplink component carriers which are scheduled by the user equipment at present are shifted, and then the physical resource blocks of all the uplink component carriers which can be scheduled on the current downlink component carriers of the user equipment are cascaded and numbered continuously.

Or, the physical resource blocks of each uplink component carrier which can be scheduled on the current downlink component carrier of the user equipment are cascaded and numbered continuously, and then the physical resource blocks of the uplink component carriers which can be scheduled by the user equipment are shifted integrally. Specifically, when PHICH resource mapping is performed on component carrier i, the component carriers with component carrier indexes not greater than i are cascaded from low to high according to the indexes, and the physical resource block shifting is performed on the whole i +1 component carriers.

And determining the resource of the physical hybrid retransmission indication channel in the downlink component carrier according to the index of the physical resource block in the rearranged uplink component carrier. Wherein, the shift can be right shift or cyclic left shift or cyclic right shift.

According to one of the following modes, the physical resource blocks of each uplink component carrier which can be scheduled currently by the user equipment are cascaded and numbered continuously:

numbering physical resource blocks of uplink component carriers matched with downlink component carriers where downlink control information of current uplink scheduling is located according to the numbering mode of a long-term evolution system, cascading the physical resource blocks of other uplink component carriers which can be scheduled on the current downlink component carriers, and uniformly and continuously numbering according to the frequency from high to low or from low to high; or,

and cascading physical resource blocks of each uplink component carrier which can be scheduled on the current downlink component carrier of the user equipment, and numbering continuously according to the frequency from high to low or from low to high.

The shift amount at the time of shift can be obtained in one of the following ways:

1) the predefined value is: p represents the maximum or minimum bandwidth of the uplink component carrier which can be scheduled by the user equipment on the downlink component carrier where the downlink control information of the current uplink scheduling is located, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the downlink control information of the current uplink scheduling is located; n represents the number of uplink component carriers of the current user equipment which can be scheduled by the downlink component carrier where the downlink control information of the current uplink scheduling is located. If the index of the uplink component carrier is i, the shift amount isOr

Or

Or

Or

Or

Wherein p is_iThe number of physical resource blocks corresponding to the uplink component carrier i;

a rounding-down operation is indicated and,

represents a rounding up operation;

2) the amount of shift is configured by higher layer signaling, in particular one of a plurality of predefined values configured by higher layer signaling.

The shift amount here refers to the shift amount of the aforementioned right shift or cyclic left shift or cyclic right shift.

Furthermore, the component carrier index i is confirmed in the same way as the one way.

The specific mapping method of PHICH resources in the UL MIMO scene comprises the following steps: and determining DMRS related parameters in the PHICH resource mapping formula according to specific situations.

First, in an uplink multi-antenna scenario, a group or one DMRS dynamic cyclic shift amount is allocated to a UE in a downlink control information Format (DCI Format X), and a corresponding signaling overhead is 2 bits or 3 bits.

Further, the DCI also includes a 1-bit OCC enable flag (referred to as OCC enable information) or orthogonal code index 1 bit referred to as OCC index information, where the bit is 0 to indicate that OCC is not enabled, or the orthogonal code index is 0, and corresponds to (1, 1), and when the bit is 1, indicates that OCC is enabled, or the orthogonal code index is 1, and corresponds to (1, -1). Or when the bit is 0, OCC is enabled, or the orthogonal code index is 0, corresponding to (1, -1), and when the bit is 1, OCC is not enabled, or the orthogonal code index is 1, corresponding to (1, 1).

And secondly, the UE receives the DCI Format X, obtains a group of or one DMRS dynamic cyclic shift amount, and sends uplink data according to the DCI.

Thirdly, the base station side feeds back ACK/NACK information of uplink data, the information is borne on a PHICH, and a dynamic cyclic shift parameter n of DMRS in PHICH mapping_DMRSThe selection rule is as follows:

(1) in DCI Format X, the overhead of allocating a group of DMRS dynamic cyclic shift amount to UE is 2 bits, and when OCC enabling information or index information is 1 bit, if the scheduled component carrier only transmits 1 code stream, the 3 bits information is directly used as the dynamic cyclic shift parameter n of DMRS in PHICH mapping_DMRS。

(2) When the overhead of allocating one DMRS dynamic cyclic shift amount to the UE in DCI Format X is 3 bits and there is 1 bit of OCC enable information or index information, the PHICH resource mapping method may be one of the following methods:

directly using the 4-bit information as a dynamic cyclic shift parameter n of DMRS in PHICH mapping_DMRS. Or

When OCC is not enabled or OCC index is (1, 1), directly using the 3 bits of information as dynamic cyclic shift parameter n of DMRS in PHICH mapping_DMRS(ii) a When OCC is enabled or the OCC index is (1, -1), according to the dynamic cyclic shift parameter n of DMRS in PHICH mapping corresponding to part of state in the 3 bits of information _DMRS2, dynamic cyclic shift parameter n of DMRS in PHICH mapping corresponding to other states_DMRS＝7。

(3) The overhead of allocating a group of DMRS dynamic cyclic shift amount to UE in DCI Format X is 3 bits, if the scheduled component carrier sends 1 code stream, the 3 bits information is directly used as the dynamic cyclic shift parameter n of DMRS in PHICH mapping_DMRS。

(4) The overhead of allocating a group of DMRS dynamic cyclic shift amount to UE in DCI Format X is 2 bits or 3 bits, if 2 code word streams are transmitted by the scheduled component carrier, the PHICH resources of the 2 code word streams are bound, only 1 ACK/NACK information is fed back, and the 2 bits or 3 bits information is directly used as the dynamic cyclic shift parameter n of DMRS in PHICH mapping_DMRS。

The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.

The first and second scheme embodiments are the first optimization method for solving the PHICH resource conflict problem, and the third and fourth scheme embodiments are the second optimization method for solving the PHICH resource conflict problem.

Embodiment five relates to the definition of DMRS related parameters in PHICH resource mapping in UL MIMO scenario.

Embodiment example 1

Suppose that n UL component carriers of a UE are scheduled on a certain downlink component carrier CC1 in a certain downlink subframe, and the n UL component carriers are respectively denoted as CC according to frequency from low to high₀、CC₁、…、CC_n-1Wherein CC1 and CC₁Is a pair of paired component carriers. Then component carrier CC₁Is indexed by 000 (binary), CC₀、CC₂、…、CC_n-1Is in turn 001 (binary), 010 (binary), …, n-1 (decimal). An offset is added to the PRB index in the PHICH resource mapping formula, the offset being equal to the product of the component carrier index and a default value. Is formulated as follows:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{cc}}k+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

offset n_cck，n_ccDenotes the above-mentioned component carrier index, and k denotes a default value. The default value may be one of four values 10, 20, 30, 40, as indicated by 2-bit UE-specific higher layer signaling, e.g., 00 (binary) for default value of 10, 01 (binary) for default value of 20, 10 (binary) for default value of 30, and 11 (binary) for default value of 40. The default values of all the scheduled UL component carriers are the same, the high-level signaling overhead is 2 bits, or the default value of each scheduled UL component carrier is indicated by 2-bit high-level signaling, and the signaling overhead is 2 x (n-1) bits.

EXAMPLES No. two

Suppose that n UL component carriers of a UE are scheduled on a certain downlink component carrier CC1 in a certain downlink subframe, and the n UL component carriers are respectively denoted as CC according to frequency from low to high₀、CC₁、…、CC_n-1Wherein CC1 and CC₁Is a pair of paired component carriers. Then component carrier CC₁Is indexed by 000 (binary), CC₀、CC₂、…、CC_n-1Is in turn 001 (binary), 010 (binary), …, n-1 (decimal). Adding an offset to a PRB index in a PHICH resource mapping formulaThe offset is equal to the product of the component carrier index and a default value. Is formulated as follows:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{cc}}k+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

offset n_cck，n_ccDenotes the above-mentioned component carrier index, and k denotes a default value. The default value is

Or

p represents the maximum or minimum bandwidth (unit is PRBs) in the uplink component carrier waves which can be scheduled by the current user equipment, or the bandwidth of the uplink component carrier waves paired by the downlink component carrier waves in which the current downlink control information is located; n represents the number of uplink component carriers of the current user equipment which can be scheduled by the current downlink component carrier.

EXAMPLES No. III

The physical resource blocks of the uplink component carriers which are scheduled by the user equipment at present are shifted, and then the physical resource blocks of all the uplink component carriers which can be scheduled on the current downlink component carriers of the user equipment are cascaded and numbered continuously. And determining the resource of the physical hybrid retransmission indication channel in the downlink component carrier according to the index of the physical resource block in the rearranged uplink component carrier. Wherein, the shift can be right shift or cyclic left shift or cyclic right shift.

The shift amount of the physical resource block of the currently scheduled uplink component carrier may be a predefined value, i.e. no signaling indication is needed; or a higher layer signaling configuration, the higher layer may predefine one of a plurality of cyclic shift amounts by less signaling indication if the higher layer signaling configuration is employed.

The physical resource block cascade of each current scheduled uplink component carrier, and the method for carrying out continuous numbering comprises the following steps: and numbering the physical resource blocks of the uplink component carriers matched with the downlink component carrier where the downlink control information of the current uplink scheduling is located according to the numbering mode of the long-term evolution system, cascading the physical resource blocks of other uplink component carriers which can be scheduled on the current downlink component carrier, and uniformly and continuously numbering according to the frequency from high to low or from low to high.

Assume that the confirmation of the index of the component carrier is: the index of the uplink component carrier paired with the component carrier where the downlink control information of the current uplink scheduling of the user equipment is located is 0, and the indexes of other uplink component carriers which can be scheduled by cross-carrier on the current downlink component carrier of the user equipment are numbered continuously according to the frequency from high to low or from low to high.

Suppose that n UL component carriers of a UE are scheduled on a downlink component carrier CC1, and these n UL component carriers are respectively denoted as CC according to frequency from low to high₀、CC₁、…、CC_n-1Wherein CC1 and CC₁Is a pair of paired component carriers. Then component carrier CC₁Is indexed by 000 (binary), CC₀、CC₂、…、CC_n-1Is in turn 001 (binary), 010 (binary), …, n-1 (decimal). CC (challenge collapsar)₀、CC₁、…、CC_n-1Respectively has a bandwidth of N₁、N₀、…、N_n-1(subscript coincides with index of component carrier), component carrier 0, i.e., CC₁The PRB indexes are not numbered again, namely the PRB indexes are numbered according to the numbering rule of LTE, and Component Carriers (CC)₀、CC₂、…、CC_n-1Is shifted by the amount of

Or

Or

Or

Or

Or

Then PRB continuous numbering is carried out according to the sequence after shifting, component carrier 0, namely CC₁PRB number range of (2) is 0 to N₀-1, component carrier 1, i.e. CC₀PRB number range of N₀～N₀+N₁-1, component carrier 2, i.e. CC₂Is N₀+N₁～N₀+N₁+N₂-1, …, component carrier n-1, i.e. CC_n-1Is numbered in the rangeWherein p is_iThe number of physical resource blocks corresponding to the uplink component carrier i; or the cyclic shift amount is configured by higher layer signaling.

When the shift is right shift, the PHICH resource mapping formula of the corresponding component carrier i can be modified as:

<math><mrow><msubsup><mi>n</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>=</mo><mrow><mo>(</mo><msubsup><mi>I</mi><mrow><mi>PRB</mi><mo>_</mo><mi>RA</mi></mrow><mrow><mi>lowest</mi><mo>_</mo><mi>index</mi></mrow></msubsup><mo>+</mo><mi>shift</mi><mo>+</mo><munderover><mi>&Sigma;</mi><mrow><mi>t</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>i</mi><mo>-</mo><mn>1</mn></mrow></munderover><msub><mi>N</mi><mi>t</mi></msub><mo>+</mo><msub><mi>n</mi><mi>DMRS</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>+</mo><msub><mi>I</mi><mi>PHICH</mi></msub><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup></mrow></math>

when the shift is a cyclic left shift or a cyclic right shift, the PHICH resource mapping formula of the corresponding component carrier i can be modified as follows:

<math><mrow><msubsup><mi>n</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>=</mo><mrow><mo>(</mo><mrow><mrow><mo>(</mo><msubsup><mi>I</mi><mrow><mi>PRB</mi><mo>_</mo><mi>RA</mi></mrow><mrow><mi>lowest</mi><mo>_</mo><mi>index</mi></mrow></msubsup><mo>+</mo><mi>shift</mi><mo>)</mo></mrow><mi>mod</mi><msub><mi>N</mi><mi>i</mi></msub><mo>+</mo><munderover><mi>&Sigma;</mi><mrow><mi>t</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>i</mi><mo>-</mo><mn>1</mn></mrow></munderover><msub><mi>N</mi><mi>t</mi></msub><mo>+</mo><msub><mi>n</mi><mi>DMRS</mi></msub></mrow><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>+</mo><msub><mi>I</mi><mi>PHICH</mi></msub><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup></mrow></math>

the value of | shift | can be

OrOr

Or

Or

Or

Or configured by higher layer signaling. When the shift is left shift, the corresponding shift is a negative value; when right shifted, the corresponding shift is positive.

The meaning of the added parameters is described as follows: n is the number of uplink component carriers which can be currently scheduled, and p represents the maximum or minimum bandwidth in the uplink component carriers which can be currently scheduled, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the current downlink control information is located; i is the index of the uplink component carrier determined in the above manner, N_tRepresenting the bandwidth of the component carrier t, N_iDenotes the bandwidth of component carrier i, t is also the index of the uplink component carrier determined in the manner described above, p_iIs the bandwidth (in PRBs) of the uplink component carrier i. The meaning of other parameters is the same as the LTE standard (see background technology).

FIG. 5 is a schematic diagram of this embodiment with a cyclic right shift.

EXAMPLES example four

The physical resource blocks of each uplink component carrier which can be scheduled on the current downlink component carrier of the user equipment are cascaded and are numbered continuously, and then the physical resource blocks of the uplink component carriers which can be scheduled by the user equipment are shifted integrally. Specifically, when PHICH resource mapping is performed on component carrier i, the component carriers with component carrier indexes not greater than i are cascaded from low to high according to the indexes, and the physical resource block shifting is performed on the whole i +1 component carriers.

And determining the resource of the physical hybrid retransmission indication channel in the downlink component carrier according to the index of the physical resource block in the rearranged uplink component carrier. Wherein, the shift can be right shift or cyclic left shift or cyclic right shift.

Assume that the confirmation of the index of the component carrier is: the index of the uplink component carrier paired with the component carrier where the downlink control information of the current uplink scheduling of the user equipment is located is 0, and the indexes of other uplink component carriers which can be scheduled by cross-carrier on the current downlink component carrier of the user equipment are numbered continuously according to the frequency from high to low or from low to high.

Suppose that n UL component carriers of a UE can be scheduled on a downlink component carrier CC1, and these n UL component carriers are respectively denoted as CC according to frequency from low to high₀、CC₁、…、CC_n-1Wherein CC1 and CC₁Is a pair of paired component carriers. Then component carrier CC₁Is indexed by 000 (binary), CC₀、CC₂、…、CC_n-1Is in turn 001 (binary), 010 (binary), …, n-1 (decimal). CC (challenge collapsar)₀、CC₁、…、CC_n-1Respectively has a bandwidth of N₁、N₀、…、N_n-1(subscript coincides with index of component carrier), component carrier 0, i.e., CC₁Do not renumber, i.e. numbering according to LTENumbered regularly, component carrier CC₀、CC₂、…、CC_n-1The PRBs of (a) are numbered consecutively from low to high in frequency. Component carrier 0, i.e. CC₁PRB number range of (2) is 0 to N₀-1, component carrier 1, i.e. CC₀PRB number range of N₀～N₀+N₁-1, component carrier 2, i.e. CC₂Is N₀+N₁～N₀+N₁+N₂-1, …, component carrier n-1, i.e. CC_n-1Is numbered in the range

When PHICH resource mapping is carried out on an uplink component carrier i, all component carriers with component carrier indexes not larger than i are cascaded from low to high according to the indexes, the whole is shifted, and the shift amount is

Or

OrOr

Or

Or

Wherein p is_iThe number of physical resource blocks corresponding to the uplink component carrier i; or the amount of shift is configured by higher layer signaling.

When the shift is left shift or right shift, the PHICH resource mapping formula of the corresponding component carrier i can be modified as:

<math><mrow><msubsup><mi>n</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>=</mo><mrow><mo>(</mo><msubsup><mi>I</mi><mrow><mi>PRB</mi><mo>_</mo><mi>RA</mi></mrow><mrow><mi>lowest</mi><mo>_</mo><mi>index</mi></mrow></msubsup><mo>+</mo><mi>shift</mi><mo>+</mo><munderover><mi>&Sigma;</mi><mrow><mi>t</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>i</mi><mo>-</mo><mn>1</mn></mrow></munderover><msub><mi>N</mi><mi>t</mi></msub><mo>+</mo><msub><mi>n</mi><mi>DMRS</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>+</mo><msub><mi>I</mi><mi>PHICH</mi></msub><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup></mrow></math>

when the shift is a cyclic left shift or a cyclic right shift, the PHICH resource mapping formula of the corresponding component carrier i can be modified as follows:

<math><mrow><msubsup><mi>n</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>=</mo><mrow><mo>(</mo><mrow><mrow><mo>(</mo><msubsup><mi>I</mi><mrow><mi>PRB</mi><mo>_</mo><mi>RA</mi></mrow><mrow><mi>lowest</mi><mo>_</mo><mi>index</mi></mrow></msubsup><mo>+</mo><mi>shift</mi><mo>+</mo><munderover><mi>&Sigma;</mi><mrow><mi>t</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>i</mi><mo>-</mo><mn>1</mn></mrow></munderover><msub><mi>N</mi><mi>t</mi></msub><mo>)</mo></mrow><mi>mod</mi><munderover><mi>&Sigma;</mi><mrow><mi>t</mi><mo>=</mo><mn>0</mn></mrow><mi>i</mi></munderover><msub><mi>N</mi><mi>t</mi></msub><mo>+</mo><msub><mi>n</mi><mi>DMRS</mi></msub></mrow><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup><mo>+</mo><msub><mi>I</mi><mi>PHICH</mi></msub><msubsup><mi>N</mi><mi>PHICH</mi><mi>group</mi></msubsup></mrow></math>

the value of | shift | can be

Or

Or

OrOr

Or

When moving to the left, shift takes a negative value, and when moving to the right, shift takes a positive value. Or the value of shift is configured by higher layer signaling.

The meaning of the added parameters is described as follows: n is the number of uplink component carriers which can be currently scheduled, and p represents the maximum or minimum bandwidth in the uplink component carriers which can be currently scheduled, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the current downlink control information is located; i is the index of the above uplink component carrier, N_tRepresenting the bandwidth of the component carrier t, N_iDenotes the bandwidth of the component carrier i, t is also as aboveIndex of uplink component carrier, p, determined by formula_iIs the bandwidth (in PRBs) of the uplink component carrier i. The meaning of other parameters is the same as the LTE standard (see background technology).

EXAMPLES example five

In the UL MIMO scenario, a set of dynamic cyclic shift amounts (SU-MIMO) or one dynamic cyclic shift amount (MU-MIMO) is allocated to the UE in DCI Format X, the signaling overhead is 2 bits or 3 bits, and 1 bit of OCC enable bit information or OCC index information may also be added. Regarding the parameter configuration related to the uplink DMRS in the DCI, the standard will eventually select only one of the following schemes:

the first scheme is as follows: 2 bits correspond to a group of dynamic cyclic shift values, and OCC enabling information of 1 bit;

scheme II: 3 bits corresponding to a group of dynamic cyclic shift amount or one dynamic cyclic shift amount, 1 bit of OCC enabling information;

the third scheme is as follows: 3 bits correspond to a group of dynamic cyclic shift amount or a dynamic cyclic shift amount, and OCC enabling information is not included;

and the scheme is as follows: 2 bits correspond to a set of dynamic cyclic shift amounts without OCC enable information.

For scheme one, which only applies to SU-MIMO, 2-bit signaling means as follows:

when 2 dynamic cyclic shift amounts need to be allocated to the UE, one of the 2-bit signaling states corresponds to one of the following 4 sets of dynamic cyclic shift amounts: (0, 6), (2, 8), (3, 9), (4, 10).

When 3 dynamic cyclic shift amounts need to be allocated to the UE, one of the 2-bit signaling states corresponds to one of the following 3 sets of dynamic cyclic shift amounts: (0, 4, 8), (2, 6, 10), (3, 6, 9).

When 4 dynamic cyclic shift amounts need to be allocated to the UE, one of the 2-bit signaling states corresponds to one of the following 2 sets of dynamic cyclic shift amounts: (0, 3, 6, 9), (2, 4, 8, 10).

The meaning of the 1-bit OCC enable information is as follows:

when the layer index is even, the time domain orthogonal code of the DMRS of the layer is (1, 1); when the layer index is odd, the time domain orthogonal code of the DMRS of the layer is (1, -1). Or

If the data transmitted by the scheduled UE uplink component carrier is 2 layers, the data is marked as Layer 0 and Layer 1 according to the Layer index. The time-domain orthogonal code of DMRS for Layer 0 is (1, 1), and the time-domain orthogonal code of DMRS for Layer 1 is (1, -1). Or the time-domain orthogonal code of the DMRS of Layer 0 is (1, -1), and the time-domain orthogonal code of the DMRS of Layer 1 is (1, 1).

If the data transmitted by the scheduled UE uplink component carrier is 3 layers, the data is marked as Layer 0, Layer 1 and Layer 2 according to the Layer index. The time-domain orthogonal code of DMRS for Layer 1 is (1, 1), and the time-domain orthogonal code of DMRS for Layer 2 is (1, -1). Or the time-domain orthogonal code of the DMRS of Layer 1 is (1, -1), and the time-domain orthogonal code of the DMRS of Layer 2 is (1, 1).

If the data transmitted by the scheduled UE uplink component carrier is 4 layers, the data is marked as Layer 0, Layer 1, Layer 2 and Layer3 according to the Layer index. The time domain orthogonal codes of the DMRSs for Layer 0 and Layer 2 are (1, 1), and the time domain orthogonal codes of the DMRSs for Layer 1 and Layer3 are (1, -1). Or the time domain orthogonal codes of the DMRSs of Layer 0 and Layer 2 are (1, -1), and the time domain orthogonal codes of the DMRSs of Layer 1 and Layer3 are (1, 1).

The meaning of 1-bit OCC disable information is: the DMRSs in each layer do not use time-domain orthogonal codes, or the time-domain orthogonal codes are (1, 1).

For scheme two, applicable to SU-MIMO and MU-MIMO, the meaning of 3-bit signaling is as follows:

when 1 dynamic cyclic shift amount needs to be allocated to the UE, 8 dynamic cyclic shift amounts: 0. the 3-bit signaling corresponding to 6, 3, 4, 2, 8, 10, and 9 is: 000. 001, 010, 011, 100, 101, 110, 111.

When 2 dynamic cyclic shift amounts need to be allocated to the UE, one of the 3-bit signaling states corresponds one-to-one to one of the following 8 sets of dynamic cyclic shift amounts: (0, 6), (6, 0), (3, 9), (4, 10), (2, 8), (8, 2), (9, 3), (10, 4). The 3-bit signaling corresponding to each group is as follows in sequence: 000. 001, 010, 011, 100, 101, 110, 111, the cyclic shift amount in each group is mapped from lower layer to higher layer.

When 3 dynamic cyclic shift amounts need to be allocated to the UE, one of the 3-bit signaling states corresponds one-to-one to one of the following 8 sets of dynamic cyclic shift amounts: (0, 4, 8), (6, 10, 2), (3, 6, 9), (4, 8, 0), (2, 6, 10), (8, 0, 4), (10, 2, 6), (9, 3, 6). The 3-bit signaling corresponding to each group is as follows in sequence: 000. 001, 010, 011, 100, 101, 110, 111, the cyclic shift amount in each group is mapped from lower layer to higher layer.

When 4 dynamic cyclic shift amounts need to be allocated to the UE, one of the 3-bit signaling states corresponds one-to-one to one of the following 8 sets of dynamic cyclic shift amounts: (0, 3, 6, 9), (6, 9, 0, 3), (3, 6, 9, 0), (4, 8, 10, 2), (2, 4, 8, 10), (8, 10, 2, 4), (10, 2, 4, 8), (9, 0, 3, 6). The 3-bit signaling corresponding to each group is as follows in sequence: 000. 001, 010, 011, 100, 101, 110, 111, the cyclic shift amount in each group is mapped from lower layer to higher layer.

The meaning of the 1-bit OCC enable information is as follows:

for MU-MIMO, the time-domain orthogonal code of the DMRS of the 1-bit OCC-enabled component carrier representing the scheduled UE is (1, -1). The 1-bit OCC does not enable the time-domain orthogonal code of the DMRS indicating the component carrier of the scheduled UE to be (1, 1). For SU-MIMO, OCC enable information has the same meaning as the scheme.

And for the third scheme, the method is applicable to SU-MIMO and MU-MIMO, and the DMRS does not adopt an OCC scheme. The meaning of 3 bits is the same as scheme two.

For scheme four, only SU-MIMO is applicable, and the DMRS does not adopt the OCC scheme. 2 bits have the same meaning as in scheme 1).

If the scheme one is adopted, the overhead of allocating a group of DMRS dynamic cyclic shift amounts to the UE in the DCI Format X is 2 bits, and when OCC enabling information is 1 bit, if the scheduled component carrier only sends 1 code stream, the 3-bit information is directly used as the dynamic cyclic shift parameter n of the DMRS in the PHICH mapping formula_DMRS。

If the second scheme is adopted, when the overhead of allocating one DMRS dynamic cyclic shift amount to the UE in the DCI Format X is 3 bits and there is 1 bit of OCC enabling information, the PHICH resource mapping method may be one of the following methods:

directly using the 4-bit information as a dynamic cyclic shift parameter n of DMRS in a PHICH mapping formula_DMRS. Or

When OCC is not enabled, directly using the 3-bit information as a dynamic cyclic shift parameter n of DMRS in a PHICH mapping formula_DMRS(ii) a When OCC is enabled, according to the dynamic cyclic shift parameter n of DMRS in PHICH mapping formula corresponding to part of state in the 3 bits of information _DMRS2, dynamic cyclic shift parameter n of DMRS in PHICH mapping formula corresponding to other states_DMRS7. For example, when the 3 bits are 000, 001, 011, n _DMRS2; when the 3 bits are 100, 101, 110, n_DMRS＝7。

If scheme two or scheme three is adopted, when a set of DMRS dynamic cyclic shift amount is allocated to the UE in DCIFormat X, if the scheduled component carrier transmits 1 code stream, the 3 bits of information are directly used as the dynamic cyclic shift parameter n of the DMRS in the PHICH mapping formula_DMRS。

For the scheme one, the scheme two, the scheme three and the scheme four, when the overhead of allocating a group of DMRS dynamic cyclic shift values to the UE in the DCI Format X is 2 bits or 3 bits, if the scheduled component carrier sends 2 code word streams, the PHICH resources of the 2 code word streams are bound, only 1 ACK/NACK information is fed back, and the 2 bits or 3 bits information is directly used as the PHICH mapping formulaDynamic cyclic shift parameter n of DMRS_DMRS。

Or, for the first scheme, the second scheme, the third scheme and the fourth scheme, when a group of DMRS dynamic cyclic shift amounts is allocated to the UE in the DCI Format X, each DMRS dynamic cyclic shift amount in each group of DMRS dynamic cyclic shift amounts corresponds to one 3-bit DMRS dynamic cyclic shift parameter, wherein a correspondence between the DMRS dynamic cyclic shift amounts and the DMRS dynamic cyclic shift parameters is the same as a correspondence between DMRS dynamic cyclic shift amounts and DMRS dynamic cyclic shift parameters configured in the downlink control information Format 0. Taking the DMRS dynamic cyclic shift parameter corresponding to the DMRS dynamic cyclic shift amount of the lowest or highest layer of the layer where the code word stream on the uplink component carrier as n in a physical hybrid retransmission indicator channel PHICH mapping formula of the code word stream_DMRSCalculating a PHICH mapping of the codeword stream.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. A mapping method of physical hybrid retransmission indication channel is characterized in that,

when physical hybrid retransmission indicator channel (PHICH) mapping is carried out in uplink cross-carrier scheduling, an offset is added to the lowest index of a physical resource block allocated by uplink resources.

2. The method of claim 1,

the offset is the product of the component carrier index i and the default value k.

3. The method of claim 2,

the default value k is one of a plurality of predefined default values configured by higher layer signaling, or,

the default value k takes the value of

Or

p represents the maximum or minimum bandwidth of the uplink component carrier which can be scheduled by the user equipment on the downlink component carrier where the downlink control information of the current uplink scheduling is located, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the downlink control information of the current uplink scheduling is located; n represents the number of uplink component carriers of the current user equipment which can be scheduled by the downlink component carrier where the downlink control information of the current uplink scheduling is located,

a rounding-down operation is indicated and,

indicating a rounding up operation.

4. The method of claim 1,

the physical resource blocks of the uplink component carriers which are currently scheduled by the user equipment are shifted, then the physical resource blocks of all the uplink component carriers which can be scheduled on the current downlink component carriers of the user equipment are cascaded and are numbered continuously, and the resources of the physical hybrid retransmission indicating channels in the downlink component carriers are determined according to the indexes of the physical resource blocks in the rearranged uplink component carriers, wherein the shifting is right shifting, circular left shifting or circular right shifting.

5. The method of claim 1,

the physical resource blocks of each uplink component carrier which can be scheduled on the current downlink component carrier of the user equipment are cascaded and numbered continuously, then the physical resource blocks of the uplink component carriers which can be scheduled by the user equipment are wholly shifted, and the resources of the physical hybrid retransmission indication channel in the downlink component carrier are determined according to the indexes of the physical resource blocks in the rearranged uplink component carrier.

6. The method of claim 5,

when PHICH resource mapping is carried out on a component carrier i, all component carriers with component carrier indexes not larger than i are cascaded from low to high according to the indexes, and a physical resource block is shifted on the whole i +1 component carriers, wherein the shifting is right shifting, circular left shifting or circular right shifting.

7. The method of claim 4 or 5,

according to one of the following modes, the physical resource blocks of each uplink component carrier which can be scheduled currently by the user equipment are cascaded and numbered continuously:

numbering physical resource blocks of uplink component carriers matched with downlink component carriers where downlink control information of current uplink scheduling is located according to the numbering mode of a long-term evolution system, cascading the physical resource blocks of other uplink component carriers which can be scheduled on the current downlink component carriers, and uniformly and continuously numbering according to the frequency from high to low or from low to high; or,

and cascading physical resource blocks of each uplink component carrier which can be scheduled on the current downlink component carrier of the user equipment, and numbering continuously according to the frequency from high to low or from low to high.

8. The method of claim 4 or 5 or 6,

the shift amount at the time of shift can be obtained in one of the following ways:

1) the predefined value is: p represents the maximum or minimum bandwidth of the uplink component carrier which can be scheduled by the user equipment on the downlink component carrier where the downlink control information of the current uplink scheduling is located, or the bandwidth of the uplink component carrier paired with the downlink component carrier where the downlink control information of the current uplink scheduling is located; n represents the number of uplink component carriers of the current user equipment which can be scheduled by the downlink component carrier where the downlink control information of the current uplink scheduling is located, if the index of the uplink component carrier is i, the shift amount is

Or

Or

Or

Or

Or

Wherein p is_iThe number of physical resource blocks corresponding to the uplink component carrier i;

a rounding-down operation is indicated and,

represents a rounding up operation;

2) the amount of shift is configured by higher layer signaling, in particular one of a plurality of predefined values configured by higher layer signaling.

9. The method of claim 2 or 6,

the component carrier index i is one of the following values:

1) the value of the component carrier indication field in the current uplink scheduling downlink control information format of the user equipment;

2) a component carrier index specific to a high-level configured user equipment;

3) a predefined component carrier index, the predefined manner being one of:

the index of the uplink component carrier matched with the component carrier where the downlink control information of the current uplink scheduling of the user equipment is located is 0, and the indexes of other uplink component carriers which can be scheduled by cross-carrier on the current downlink component carrier of the user equipment are continuously numbered according to the frequency from high to low or from low to high; or,

the user equipment carries out continuous numbering according to the frequency from high to low or from low to high on the indexes of all the uplink component carriers which can be scheduled on the current downlink component carrier.

10. A mapping method of physical hybrid retransmission indication channel is characterized in that,

in an uplink multi-antenna scene, a group or one demodulation reference signal dynamic cyclic shift amount is allocated to user equipment in a downlink control information format, and when a base station sends uplink data confirmation or non-confirmation information through physical hybrid retransmission indicator channel (PHICH) information, a demodulation reference signal dynamic cyclic shift parameter n in physical hybrid retransmission indicator channel resource mapping is determined according to signaling in the downlink control information_DMRS。

11. The method of claim 10,

when the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 2 bits and the time domain orthogonal code enabling information or the index information occupies 1 bit simultaneously, if the scheduled component carrier only transmits 1 code word stream, the 3-bit information is directly used as a substanceDemodulation reference signal dynamic cyclic shift parameter n in physical hybrid retransmission indication channel mapping_DMRS。

12. The method of claim 10,

the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 3 bits, and when the time domain orthogonal code enabling information or the index information occupies 1 bit, the dynamic cyclic shift parameter n of the demodulation signal in the PHICH resource mapping_DMRSSelecting one of the following modes:

directly using the 4-bit information as a demodulation reference signal dynamic cyclic shift parameter n in PHICH mapping_DMRSEither the first or the second substrate is, alternatively,

when the time domain orthogonal code enabling information is not enabled or the time domain orthogonal code index information is (1, 1), directly using the 3 bits of information as a demodulation reference signal dynamic cyclic shift parameter n in PHICH mapping_DMRS(ii) a When the time domain orthogonal code enabling information is enabled or the time domain orthogonal code index information is (1, -1), according to the demodulation reference signal dynamic cyclic shift parameter n in the PHICH mapping corresponding to part of the state in the 3 bits of information_DMRS2, demodulation reference signal dynamic cyclic shift parameter n in PHICH mapping corresponding to other states_DMRS＝7。

13. The method of claim 10,

the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 3 bits, and if the scheduled component carrier only sends 1 code stream, the 3 bits of information are directly used as the dynamic cyclic shift parameter n of the demodulation reference signal in the physical hybrid retransmission indication channel mapping_DMRS。

14. The method of claim 10,

the overhead of the dynamic cyclic shift amount of the demodulation reference signal allocated to the user equipment is 2 bits or 3 bits if the component carrier is scheduledWhen wave only sends 2 code word streams, the physical mixed retransmission indicating channel resources of the 2 code word streams are bound, only one piece of confirmation or non-confirmation information is fed back, and the 2 bit or 3 bit information is directly used as a demodulation reference signal dynamic cyclic shift parameter n in the physical mixed retransmission indicating channel mapping_DMRS。

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