CN101183920B - Method and apparatus for mapping PHICH to physical subcarrier - Google Patents

Abstract

The invention provides a mapping method and device for an indication channel PHICH of a physical hybrid automatic repeat request to a physical sub-carrier, comprising a plurality of mapping steps of a frequency domain. The invention is characterized in that: a plurality of usable physical sub-carriers of an FDD system is evenly divided into four areas; the three resource groups of a PHICH are one-to-one correspondence with the three areas of the four areas. The invention has the advantages of ensured diversity gain of PHICH and simple realization and little influence on performance of other downlink physical channels.

Description

PHICH is to mapping method and the device of physical sub-carrier

Technical field

The present invention relates to the communications field, and especially, relate to a kind of PHICH to mapping method and the device of physical sub-carrier.

Background technology

The develop rapidly of digital communication system is had higher requirement to the reliability of data communication, yet under abominable channel, especially in high data rate or the high-speed mobile environment, multipath interference and Doppler frequency shift etc. seriously affect systematic function.Therefore, effective error-control technique, especially mixing automatic repeat request (Hybrid Automatic RepeatRequest, HARQ) technology just becomes the focus that the communications field endeavours to study.

At third generation partner program (3rd Generation Partnership Project, 3GPP) Long Term Evolution (Long Term Evolution, LTE) FDD (the FrequencyDivision Duplex of plan, frequency division multiplexing) in the system, down physical channel comprises Physical Control Format Indicator Channel (Physical Control Format Indicator Channel, PCFICH), Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH) and the channel such as physical mixed automatic repeat request indicating channel (Physical Hybrid ARQ IndicatorChannel, PHICH).

Wherein, PHICH is used for transmitting descending ACK and nack message.PHICH can account for 3 OFDM (Orthogonal Frequency DivisionMultiplexing, Orthodoxy Frequency Division Multiplex) symbol on time domain, also can account for 1 OFDM symbol.When coexisting with many ripples of physics channel, can also account for 2 OFDM symbols, concrete occupation mode is notified by signaling.The corresponding user of PHICH, the PHICH of different user can carry out code division multiplexing in same asset, also can divide at the enterprising line frequency of different resource multiplexingly, makes that a plurality of PHICH multiplexing on same asset are a PHICH group; A PHICH after modulation, corresponding three resource groups, each resource group need to be mapped on the subcarrier of removing the pilot tone continuous adjacent accordingly, and three resource groups of each PHICH need to be mapped on those physical sub-carriers.At present, suitable solution is not also designed in the mapping of PHICH, therefore, the FDD system of 3GPP LTE plan also can't drop into application.

Summary of the invention

Consider the problems referred to above and make the present invention that for this reason, main purpose of the present invention is to provide mapping method and the device of a kind of PHICH to physical sub-carrier.

In an embodiment of the present invention, the mapping method of a kind of physical mixed automatic repeat request indicating channel PHICH to physical sub-carrier is provided, comprise the frequency domain mapping step: on frequency domain, available physical subcarrier with the FDD system, evenly be divided into four zones, three resource groups of a PHICH and the Three regions in this four zones are set up one-to-one relationship.

This corresponding relation can be take four PHICH groups as the cycle, and each PHICH group correspondence is chosen a trizonal combination from these four zones; And it is different that combination corresponding to continuous four PHICH group is set.

According to the difference of residential quarter ID, each residential quarter PHICH arranges different frequency domain initial positions.

Preferably, take four PHICH groups as the cycle, each PHICH group correspondence is chosen a trizonal combination from these four zones specifically comprise: suppose that four zones are A, B, C and D, choosing trizonal combination from four zones has { four kinds of ABC, ABD, ACD, BCD}, the corresponding above-mentioned a kind of combination of choosing of each PHICH group.

Preferably, arrange that combination corresponding to continuous four PHICH group is different specifically to be comprised:

Arrange that combination corresponding to continuous four PHICH group is different specifically to be comprised:

$N_{\mathrm{RE}}^{\mathrm{DL}}=N_{\mathrm{RB}}^{\mathrm{DL}}\×N_{\mathrm{SC}}^{\mathrm{RB}};$

During without the physics Multicast Channel: N _T=1,3; When Physical Multicast Channel is arranged: N _T=1,2; $y(i,m)=(k(i,m)+L\×f(i,m))\mathrm{mod}{N}_{\mathrm{RE}}^{\mathrm{DL}};$ Perhaps, y (i, m)=k (i, m)+L * f (i, m); F (i, m)=(i+m * 3) mod4; K (i, m)=N _RE* ((x ₀+ g (i, m)) mod N _Total), perhaps, $x_0=N_{\mathrm{ID}}^{\mathrm{Cell}}+1,$ Perhaps,

Perhaps, $x_0=N_{\mathrm{ID}}^{\mathrm{Cell}}\mathrm{mod}{N}_{\mathrm{Total}}+1;$

i＝0，1，2； $m=\mathrm{0,1},\·\·\·,N_{{\mathrm{PHICH}}_{\mathrm{group}}}-1;$ Wherein, N _RE ^DLThe sum of available RE in the expression system, N _RB ^DLBe illustrated in Resource Block quantity available under the current system bandwidth; N _SC ^RBRepresent that a Resource Block comprises the quantity of subcarrier; N _TotalBe illustrated in pilot tone and during without pilot tone, the resource group number that the available physical subcarrier can be divided in OFDM symbol; N _REBe illustrated in pilot tone and the physical sub-carrier quantity that the resource group can comprise: L represents to comprise in the zone physical sub-carrier during without pilot tone quantity; N _TThe OFDM symbol quantity that expression PHICH continues; I represents that a PHICH organizes the sequence number of corresponding three resource groups, N _PHICHgroupThe quantity of expression PHICH group, m represents the sequence number of PHICH group, each PHICH group contains 4 or 8 PHICH channels; N _ID ^CellThe ID of expression current area, the zone at the frequency domain place of i resource group of f (i, m) m PHICH of expression, the physical sub-carrier position of frequency domain in the target area of i resource group of k (i, m) m PHICH of expression, x ₀The side-play amount of expression Target cell PHICH initial position, the relative position of frequency domain in the target area of i resource group of g (i, m) m PHICH of expression; The original position of the frequency domain of i resource group of m PHICH of y (i, m) expression, this resource group is mapped to this original position and begins, and removes pilot tone, and on the continuous N physical sub-carrier, M represents the symbol quantity after the modulation that a resource group comprises.

Preferably, according to the difference of residential quarter ID, each residential quarter PHICH arranges different frequency domain initial positions.

Preferably, also can comprise the time domain mapping step: on time domain, when the PHICH duration is 3 OFDM symbols, resource group of mapping on each symbol, when the PHICH duration was 2 OFDM symbols, a PHICH was in resource group of first symbol mapping, in two resource groups of second symbol mapping, another PHICH is in two resource groups of first symbol mapping, in resource group of second symbol mapping.

Preferably, the time domain mapping step specifically comprises: N _T≠ 1, l (i, m)=(i+m) mod N _T, perhaps, $l(i,m)=(i+m+N_{\mathrm{ID}}^{\mathrm{Cell}})\mathrm{mod}{N}_T;$ N _T=1, l (i, m)=0; Wherein, N _TThe OFDM symbol quantity that expression PHICH continues; I represents that a PHICH organizes the sequence number of corresponding three resource groups, and m represents the sequence number of PHICH group; N _ID ^CellThe ID of expression current area; The OFDM character position of i resource group of m PHICH group of l (i, m) expression.

When the PHICH duration was a plurality of OFDM symbol, different primary sign positions can be chosen according to the difference of residential quarter ID in each residential quarter, and perhaps, identical primary sign position is chosen in each residential quarter.

The mapping method of this embodiment provides PHICH to be mapped to solution on those physical sub-carriers, has therefore guaranteed the diversity gain of PHICH and the simplicity of realization, and is simultaneously, also very little to the performance impact of other down physical channels.

In an embodiment of the present invention, the mapping device of a kind of physical mixed automatic repeat request indicating channel PHICH to physical sub-carrier also is provided, comprise the frequency domain mapping block, it comprises: regional corresponding unit, be used at frequency domain, with the available physical subcarrier of FDD system, evenly be divided into four zones, three resource groups of a PHICH and the Three regions in this four zones are set up one-to-one relationship.

Preferably, the frequency domain mapping block also comprises: the combination corresponding unit, be used for take four PHICH groups as the cycle, and each PHICH group correspondence is chosen a trizonal combination from these four zones; And the combination setting unit, it is different to be used for arranging combination corresponding to continuous four PHICH group.

Preferably, also can comprise the time domain mapping block, it comprises: the first map unit, be used in time domain, and when the PHICH duration is 3 OFDM symbols, resource group of mapping on each symbol; The second map unit, be used for when the PHICH duration is 2 OFDM symbols, a PHICH is in resource group of first symbol mapping, in two resource groups of second symbol mapping, another PHICH is in two resource groups of first symbol mapping, in resource group of second symbol mapping.

Preferably, also comprise: the initial setting up module, be used for the difference according to residential quarter ID, the initial position that each residential quarter PHICH is set is different.

The mapping device of this embodiment provides PHICH to be mapped to solution on those physical sub-carriers, has therefore guaranteed the diversity gain of PHICH and the simplicity of realization, and is simultaneously, also very little to the performance impact of other down physical channels.

Description of drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart according to the PHICH of the embodiment of the invention frequency domain mapping step in the mapping method of physical sub-carrier;

Fig. 2 is the schematic diagram that shines upon at 3 OFDM symbols in the mapping method of physical sub-carrier according to the PHICH of the embodiment of the invention;

Fig. 3 is the schematic diagram that shines upon at 1 OFDM symbol in the mapping method of physical sub-carrier according to the PHICH of the embodiment of the invention; And

Fig. 4 is the block diagram according to the PHICH of the embodiment of the invention frequency domain mapping block in the mapping device of physical sub-carrier.

Embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.

Fig. 1 is according to the flow chart of the PHICH of the embodiment of the invention frequency domain mapping step in the mapping method of physical sub-carrier, comprises the frequency domain mapping step:

Step S10 on frequency domain, with the available physical subcarrier of FDD system, evenly is divided into four zones, and three resource groups of a PHICH and the Three regions in this four zones are set up one-to-one relationship.

The frequency domain mapping step also can comprise:

Step S20 take four PHICH groups as the cycle, chooses a trizonal combination with each PHICH group correspondence from these four zones; And

Step S30, it is different that combination corresponding to continuous four PHICH group is set.

The mapping method of this embodiment provides PHICH to be mapped to solution on those physical sub-carriers, has therefore guaranteed the diversity gain of PHICH and the simplicity of realization, and is simultaneously, also very little to the performance impact of other down physical channels.

On frequency domain, with the available physical subcarrier of system, evenly be divided into four zones, three resource groups of a PHICH and the Three regions in this four zones are set up one-to-one relationship.Each resource group position in respective regions can be identical, also can be different.Suppose that four zones are A, B, C and D, choosing trizonal combination from four zones has { four kinds of ABC, ABD, ACD, BCD}, the corresponding above-mentioned a kind of combination of choosing of each PHICH group, choose combination take four PHICH groups as the cycle, and guarantee that the chosen area compound mode of continuous four PHICH group is variant.Can be according to the difference of residential quarter ID, each residential quarter PHICH arranges different frequency domain initial positions.

The below provides a kind of specific embodiments, supposes the PHICH group when choosing Three regions from four zones, take ABC, ABD, BCD, ACD as the cycle, chooses the mapping area of each PHICH group, then

Suppose N _RE ^DLThe sum of available RE in the expression system, N _RB ^DLBe illustrated in Resource Block quantity available under the current system bandwidth; V _SC ^RBRepresent that a Resource Block comprises the quantity of subcarrier; N _TotalBe illustrated in pilot tone and during without pilot tone, the resource group number that the available physical subcarrier can be divided in OFDM symbol; N _REBe illustrated in pilot tone and the physical sub-carrier quantity that the resource group can comprise: L represents to comprise in the zone physical sub-carrier during without pilot tone quantity; N _TThe OFDM symbol quantity that expression PHICH continues; So concrete formula is:

$N_{\mathrm{RE}}^{\mathrm{DL}}=N_{\mathrm{RB}}^{\mathrm{DL}}\×N_{\mathrm{SC}}^{\mathrm{RB}}$

N _T=1,3; (without the physics Multicast Channel) N _T=1,2; (Physical Multicast Channel is arranged)

Concrete mapping formula is as follows:

$y(i,m)=(k(i,m)+L\×f(i,m))\mathrm{mod}{N}_{\mathrm{RE}}^{\mathrm{DL}};$ Perhaps, y (i, m)=k (i, m)+L * f (i, m);

f(i，m)＝(i+m×3)mod4；

K (i, m)=N _RE* ((x ₀+ g (i, m)) mod N _Total), perhaps,

$x_0=N_{\mathrm{ID}}^{\mathrm{Cell}}+1,$ Perhaps,

Perhaps,

$x_0=N_{\mathrm{ID}}^{\mathrm{Cell}}\mathrm{mod}{N}_{\mathrm{Total}}+1;$

i＝0，1，2； $m=\mathrm{0,1},\·\·\·,N_{{\mathrm{PHICH}}_{\mathrm{group}}}-1;$

I represents that a PHICH organizes the sequence number of corresponding three resource groups, N _PHICHgroupThe quantity of expression PHICH group, m represents the sequence number of PHICH group (containing 4 or 8 PHICH channels);

N _ID ^CellThe ID of expression current area, N _RE ^DLThe sum of available RE in the expression system, the zone at the frequency domain place of i resource group of f (i, m) m PHICH of expression, the physical sub-carrier position of frequency domain in the target area of i resource group of k (i, m) m PHICH of expression, x ₀The side-play amount of expression Target cell PHICH initial position, the relative position of frequency domain in the target area of i resource group of g (i, m) m PHICH of expression.

The original position of the frequency domain of i resource group of m PHICH of y (i, m) expression, this resource group is mapped to this original position and begins, and removes pilot tone, and on the continuous N physical sub-carrier, M represents the symbol quantity after the modulation that a resource group comprises.

Fig. 2 is the schematic diagram that shines upon at 3 OFDM symbols in the mapping method of physical sub-carrier according to the PHICH of the embodiment of the invention; Fig. 3 is the schematic diagram that shines upon at 1 OFDM symbol in the mapping method of physical sub-carrier according to the PHICH of the embodiment of the invention.

Mapping method according to the embodiment of the invention, also can comprise the time domain mapping step: on time domain, when the PHICH duration is 3 OFDM symbols, resource group of mapping on each symbol, when the PHICH duration was 2 OFDM symbols, a PHICH was in resource group of first symbol mapping, in two resource groups of second symbol mapping, another PHICH is in two resource groups of first symbol mapping, in resource group of second symbol mapping.

Preferably, the time domain mapping step specifically comprises: N _T≠ 1, l (i, m)=(i+m) mod N _T, perhaps, $l(i,m)=(i+m+N_{\mathrm{ID}}^{\mathrm{Cell}})\mathrm{mod}{N}_T;$ N _T＝1，l(i，m)＝0；

Wherein, N _TThe OFDM symbol quantity that expression PHICH continues; I represents that a PHICH organizes the sequence number of corresponding three resource groups, and m represents the sequence number of PHICH group; N _ID ^CellThe ID of expression current area; The OFDM character position of i resource group of m PHICH group of l (i, m) expression;

When the PHICH duration was a plurality of OFDM symbol, different primary sign positions can be chosen according to the difference of residential quarter ID in each residential quarter, and perhaps, identical primary sign position is chosen in each residential quarter.

By technique scheme of the present invention, guaranteed the diversity gain of PHICH and the simplicity of realization, simultaneously, also very little to the performance impact of other down physical channels.

The below will be with third generation partner program (3rd Generation PartnershipProject, 3GPP) Long Term Evolution plan (Long Term Evolution, LTE) FDD (Frequency Division Duplex, frequency division multiplexing) system is example, describes the present invention in detail.

In this example, suppose that bandwidth is 5MHz, then number of usable subcarriers is 300, contains 14 continuous OFDM symbols in the subframe, four antenna transmissions, and the original position of first antenna pilot is the 3rd subcarrier.

Example 1

Correct response message and/or error response message are being mapped in the situation of 3 OFDM symbols, and corresponding design parameter is as follows:

$N_{\mathrm{RE}}^{\mathrm{DL}}=300,$ $N_{\mathrm{RB}}^{\mathrm{DL}}=25,$ $N_{\mathrm{SC}}^{\mathrm{RB}}=12,$ N _T＝3， $N_{\mathrm{ID}}^{\mathrm{Cell}}=1,$ m＝1

The corresponding parameter that derives from is:

$l(i,m)=(i+m+N_{\mathrm{ID}}^{\mathrm{Cell}})\mathrm{mod}{N}_T$

l(0，1)＝(0+1+1)mod?3＝2；l(1，1)＝(1+1+1)mod?3＝0；

l(2，1)＝(2+1+1)mod?3＝1；

y(i，m)＝k(i，m)+L×f(i，m)；

f(i，m)＝(i+m×3)mod?4；

$x_0=N_{\mathrm{ID}}^{\mathrm{Cell}}+1;$

So,

Three set of resources of m PHICH group are not mapped on the 12nd, the 13rd, the 15th of the 0th OFDM symbol and the 16th subcarrier, on the 84th, the 85th, the 87th of the 1st OFDM symbol and the 88th subcarrier, on the 224th, the 225th, the 226th of the 2nd OFDM symbol and the 227th subcarrier

Example 2

Correct response message and/or error response message are being mapped in the situation of 1 OFDM symbol, and corresponding design parameter is as follows:

$N_{\mathrm{RE}}^{\mathrm{DL}}=300,$ $N_{\mathrm{RB}}^{\mathrm{DL}}=25,$ $N_{\mathrm{SC}}^{\mathrm{RB}}=12,$ N _T＝3， $N_{\mathrm{ID}}^{\mathrm{Cell}}=1,$ m＝1

The corresponding parameter that derives from is:

l(i，m)＝0

l(0，1)＝l(1，1)＝l(2，1)＝0；

Three set of resources of m PHICH group are not mapped to the 12nd, the 13rd, the 15th, the 16th and the 84th, the 85th, the 87th, the 88th of the 0th OFDM symbol, and on the 224th, the 225th, the 227th, the 228th subcarrier.

Fig. 4 is according to the block diagram of the PHICH of the embodiment of the invention frequency domain mapping block in the mapping device of physical sub-carrier, comprises the frequency domain mapping block, and it comprises:

Zone corresponding unit 10 is used at frequency domain, with the available physical subcarrier of FDD system, evenly is divided into four zones, and three resource groups of a PHICH and the Three regions in this four zones are set up one-to-one relationship;

Combination corresponding unit 20 is used for take four PHICH groups as the cycle, and each PHICH group correspondence is chosen a trizonal combination from these four zones; And

Combination setting unit 30, it is different to be used for arranging combination corresponding to continuous four PHICH group.

Preferably, also comprise: the time domain mapping block, be used on the time domain, it comprises:

The first map unit is used in time domain, when the PHICH duration is 3 OFDM symbols, and resource group of mapping on each symbol;

The second map unit, be used for when the PHICH duration is 2 OFDM symbols, a PHICH is in resource group of first symbol mapping, in two resource groups of second symbol mapping, another PHICH is in two resource groups of first symbol mapping, in resource group of second symbol mapping.

Preferably, also comprise: the initial setting up module, be used for the difference according to residential quarter ID, the frequency domain initial position that each residential quarter PHICH is set can be different, and the initial OFDM symbol of time domain can be identical, also can be different.

In sum, guaranteed the diversity gain of PHICH and the simplicity of realization, simultaneously, also very little to the performance impact of other down physical channels.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. a physical mixed automatic repeat request indicating channel PHICH is characterized in that to the mapping method of physical sub-carrier, comprises the frequency domain mapping step:

On frequency domain, with the available physical subcarrier of FDD system, evenly be divided into four zones, three resource groups of a PHICH and the Three regions in this four zones are set up one-to-one relationship,

Wherein, arrange that combination corresponding to continuous four PHICH group is different specifically to be comprised:

During without the physics Multicast Channel: N _T=1,3;

When Physical Multicast Channel is arranged: N _T=1,2;

Perhaps,

y(i，m)＝k(i，m)+L×f(i，m)；

f(i，m)＝(i+m×3)mod4；

K (i, m)=N _RE* ((x ₀+ g (i, m)) mod N _Total), perhaps,

Perhaps,

Perhaps,

Wherein,

The sum of available RE in the expression system,

Be illustrated in Resource Block quantity available under the current system bandwidth;

Represent that a Resource Block comprises the quantity of subcarrier; N _TotalBe illustrated in pilot tone and during without pilot tone, the resource group number that the available physical subcarrier can be divided in OFDM symbol; N _REBe illustrated in pilot tone and the physical sub-carrier quantity that the resource group can comprise: L represents to comprise in the zone physical sub-carrier during without pilot tone quantity; N _TThe OFDM symbol quantity that expression PHICH continues;

I represents that a PHICH organizes the sequence number of corresponding three resource groups,

The quantity of expression PHICH group, m represents the sequence number of PHICH group, each PHICH group contains 4 or 8 PHICH channels;

The ID of expression current area, the zone at the frequency domain place of i resource group of f (i, m) m PHICH of expression, the physical sub-carrier position of frequency domain in the target area of i resource group of k (i, m) m PHICH of expression, x ₀The side-play amount of expression Target cell PHICH initial position, the relative position of frequency domain in the target area of i resource group of g (i, m) m PHICH of expression;

The original position of the frequency domain of i resource group of m PHICH of y (i, m) expression, this resource group is mapped to this original position and begins, and removes pilot tone, and on the continuous N physical sub-carrier, M represents the symbol quantity after the modulation that a resource group comprises.

2. mapping method according to claim 1 is characterized in that, the frequency domain mapping step also comprises:

Take four PHICH groups as the cycle, each PHICH group correspondence is chosen a trizonal combination from these four zones; And

It is different that combination corresponding to continuous four PHICH group is set.

3. mapping method according to claim 2 is characterized in that, take four PHICH groups as the cycle, each PHICH group correspondence is chosen a trizonal combination specifically comprise from these four zones:

If four zones are A, B, C and D, choosing trizonal combination from four zones has { four kinds of ABC, ABD, ACD, BCD}, above-mentioned a kind of combination of choosing;

Take ABC, ABD, BCD, ACD as the cycle, the corresponding combination of each PHICH group.

4. mapping method according to claim 1 is characterized in that, also comprises: according to the difference of residential quarter ID, each residential quarter PHICH arranges different frequency domain initial positions.

5. mapping method according to claim 1 is characterized in that, also comprises the time domain mapping step:

On time domain, when the PHICH duration is 3 OFDM symbols, resource group of mapping on each symbol, when the PHICH duration is 2 OFDM symbols, a PHICH is in resource group of first symbol mapping, in two resource groups of second symbol mapping, another PHICH is in two resource groups of first symbol mapping, in resource group of second symbol mapping.

6. mapping method according to claim 5 is characterized in that, when the PHICH duration was a plurality of OFDM symbol, different primary sign positions can be chosen according to the difference of residential quarter ID in each residential quarter, and perhaps, identical primary sign position is chosen in each residential quarter.

7. mapping method according to claim 5 is characterized in that, described time domain mapping step specifically comprises:

N _T≠ 1, l (i, m)=(i+m) modN _T, perhaps,

N _T＝1，l(i，m)＝0；

Wherein, N _TThe OFDM symbol quantity that expression PHICH continues;

I represents that a PHICH organizes the sequence number of corresponding three resource groups, and m represents the sequence number of PHICH group;

The ID of expression current area;

The OFDM character position of i resource group of m PHICH group of l (i, m) expression.

8. a physical mixed automatic repeat request indicating channel PHICH is characterized in that to the mapping device of physical sub-carrier comprise the frequency domain mapping block, it comprises:

The zone corresponding unit is used at frequency domain, with the available physical subcarrier of FDD system, evenly is divided into four zones, and three resource groups of a PHICH and the Three regions in this four zones are set up one-to-one relationship;

Wherein, arrange that combination corresponding to continuous four PHICH group is different specifically to be comprised:

During without the physics Multicast Channel: N _T=1,3;

When Physical Multicast Channel is arranged: N _T=1,2;

Perhaps,

y(i，m)＝k(i，m)+L×f(i，m)；

f(i，m)＝(i+m×3)mod4；

K (i, m)=N _RE* ((x ₀+ g (i, m)) mod N _Total), perhaps,

Perhaps,

Perhaps,

i＝0，1，2；m＝0，1，…，?

Wherein,

The sum of available RE in the expression system,

Be illustrated in Resource Block quantity available under the current system bandwidth; Represent that a Resource Block comprises the quantity of subcarrier; N _TotalBe illustrated in pilot tone and during without pilot tone, the resource group number that the available physical subcarrier can be divided in OFDM symbol; N _REBe illustrated in pilot tone and the physical sub-carrier quantity that the resource group can comprise: L represents to comprise in the zone physical sub-carrier during without pilot tone quantity; N _TThe OFDM symbol quantity that expression PHICH continues;

I represents that a PHICH organizes the sequence number of corresponding three resource groups,

The quantity of expression PHICH group, m represents the sequence number of PHICH group, each PHICH group contains 4 or 8 PHICH channels;

The ID of expression current area, the zone at the frequency domain place of i resource group of f (i, m) m PHICH of expression, the physical sub-carrier position of frequency domain in the target area of i resource group of k (i, m) m PHICH of expression, x ₀The side-play amount of expression Target cell PHICH initial position, the relative position of frequency domain in the target area of i resource group of g (i, m) m PHICH of expression;

The original position of the frequency domain of i resource group of m PHICH of y (i, m) expression, this resource group is mapped to this original position and begins, and removes pilot tone, and on the continuous N physical sub-carrier, M represents the symbol quantity after the modulation that a resource group comprises.

9. mapping device according to claim 8 is characterized in that, described frequency domain mapping block also comprises:

The combination corresponding unit is used for take four PHICH groups as the cycle, and each PHICH group correspondence is chosen a trizonal combination from these four zones; And

The combination setting unit, it is different to be used for arranging combination corresponding to continuous four PHICH group.

10. mapping device according to claim 8 is characterized in that, also comprises the time domain mapping block, and it comprises:

The first map unit is used in time domain, when the PHICH duration is 3 OFDM symbols, and resource group of mapping on each symbol;

The second map unit, be used for when the PHICH duration is 2 OFDM symbols, a PHICH is in resource group of first symbol mapping, in two resource groups of second symbol mapping, another PHICH is in two resource groups of first symbol mapping, in resource group of second symbol mapping.

11. mapping device according to claim 10, it is characterized in that, also comprise the initial setting up module, be used for when the PHICH duration is a plurality of OFDM symbol, different primary sign positions is chosen according to the difference of residential quarter ID in each residential quarter, perhaps, identical primary sign position is chosen in each residential quarter.

Images