CN101212416A - Physical channel mapping method - Google Patents

Abstract

The invention relates to a method for mapping a physical channel, which comprises the steps: 16 modulated data y(0), y(1),..., and y(15) of a downlink control signaling indicating channel in a LTE system are divided into 4 groups in order and mapped by groups, which allows the indicating channel of downlink control format to be mapped to continuous 4 resource units recombined by resources which are divided among all system physical resources except the pilot frequency according to the continuous 4 resource unites. By defining group mapping rules, the method avoids a situation that residual resources can not be divided into resource groups to be distributed, thereby obtaining a maximum utilization of the system resources.

Description

A kind of mapping method of physical channel

Technical field

The present invention relates to broadband wireless communications, be specifically related to the method for a kind of third generation partnership project 3GPPLTE (long-term evolution Long Term Evolution) system descending control format indication channel to physical resource mapping.

Background technology

In the LTE system, because resource occurs with time and frequency bidimensional, so resource allocation and method for expressing thereof become more complicated, especially bandwidth ratio when big, should consider the flexibility of resource allocation, consider the requirements such as expense of control signaling again.At present, in the LTE system, stipulate, subframe length in time is 1ms, form by two equal time slots, each time slots length is 0.5ms, Resource Unit is a subcarrier in the orthogonal frequency division multiplex OFDM symbol, and a downlink resource piece (RB, Resource B1ock) is made of continuous 12 subcarriers and continuous 7 (being 6 in the time of long CP) OFDM symbols.

In the LTE system, a special channel is arranged in the downlink control channel, be called this channel of Physical Control Format Indicator Channel (PCFICH, Physical control format indicator channel) and be used for the OFDM symbolic number that all control channels of indicating downlink are occupied.At present, in the draft standard, the method for expressing that has provided descending control format indication channel to physical resource mapping is as follows:

Y (0) ... it is k=k on the Resource Unit of original position that y (3) is mapped to k ₀

Y (4) ... it is on the Resource Unit of original position that y (7) is mapped to k

Y (8) ... it is on the Resource Unit of original position that y (11) is mapped to k

Y (12) ... it is on the Resource Unit of original position that y (15) is mapped to k

Wherein, ${\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="S2007103013535E00011.png,S2007103013535E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_0=(N_{\mathrm{sc}}^{\mathrm{RB}}/2)\&CenterDot;\left(N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}2N_{\mathrm{RB}}^{\mathrm{DL}}\right),$ Y (0) ... y (15) expression is through descending control format indicating channel data after the coded modulation; N _RB ^DLThe quantity of Resource Block in the expression system, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block frequency domain is comprised, N _ID ^CellBe the proprietary ID in each sub-district.

In the LTE system, descending control format indicating channel sends on first OFDM symbol of descending sub frame, and carries out resource allocation with 4 continuous subcarriers (as run into pilot tone, then skip pilot tone) for base unit.N is arranged in the supposing the system _RB ^DLIndividual Resource Block is one group with 4 continuous subcarriers and divides, and then always organizing number is 2N _RB ^DL(, and also containing 4 subcarriers that are used for two antenna pilots among a RB) because contain 12 carrier waves among a RB.Descending control format indicating channel data after modulating are 16, need be mapped to (4 every group) on four groups, if shine upon according to the formula in the above-mentioned draft standard, when the quantity of Resource Block in the system is odd number, can make surplus resources can not all be divided into the resource group distributes, like this, just reduced the resource utilization of system.

Summary of the invention

The technical issues that need to address of the present invention are the mapping methods how a kind of physical channel is provided, the mapping that can make LTE system descending control format indication channel to physical resource no matter in the system bandwidth quantity of Resource Block be odd or even, can avoid surplus resources can not all be divided into the situation that the resource group is distributed, thereby obtain maximum resource utilization ratio.

Above-mentioned technical problem of the present invention solves like this, a kind of mapping method of physical channel is provided, with the descending control format indicating channel data y (0) after 16 modulation of LTE system, y (1), ... y (15) is divided into 4 groups and packet map in proper order by front and back, and descending control format indicating channel is mapped on continuous 4 Resource Units that overlap with the resource group of whole system physical resources except that pilot tone being divided by continuous 4 Resource Units just.

According to mapping method provided by the invention, this method specifically includes, but are not limited to following four kinds of schemes:

(1) first kind of downlink control signaling indication channel to physical resource mapping specific as follows:

Y (0) ... y (3) is mapped to variable k ₀On continuous 4 Resource Units for original position (as run into pilot tone, and then skip pilot tone), k ₀=k ₀

Y (4) ... y (7) is mapped to variable k ₁On continuous 4 Resource Units for original position (as run into pilot tone, then skip pilot tone),

Y (8) ... y (11) is mapped to variable k ₂On continuous 4 Resource Units for original position (as run into pilot tone, then skip pilot tone),

Y (12) ... y (15) is mapped to variable k ₃On continuous 4 Resource Units for original position (as run into pilot tone, then skip pilot tone),

Wherein,

Y (0) ... y (15) presentation code modulation back downlink control signaling indication channel data, N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

(2) second kinds of downlink control signaling indication channel to physical resource mapping specific as follows:

Y (0) ... y (3) is mapped to variable k ₀On continuous 4 Resource Units for original position (as run into pilot tone, and then skip pilot tone), k ₀=k ₀

Y (4) ... y (7) is mapped to variable k ₁On continuous 4 Resource Units for original position (as run into pilot tone, then skip pilot tone),

Y (8) ... y (11) is mapped to variable k ₂On continuous 4 Resource Units for original position (as run into pilot tone, then skip pilot tone),

Y (12) ... y (15) is mapped to variable k ₃On continuous 4 Resource Units for original position (as run into pilot tone, then skip pilot tone),

Wherein, ${\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="S2007103013535E00011.png,S2007103013535E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_0=(N_{\mathrm{sc}}^{\mathrm{RB}}/2)\&times;\left(N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}(2\&times;N_{\mathrm{RB}}^{\mathrm{DL}})\right),$ Y (0) ... y (15) presentation code modulation back downlink control signaling indication channel data, N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

(3) the third downlink control signaling indication channel to physical resource mapping is specific as follows:

With residual resource unit after the removal pilot tone on first OFDM symbol in the subframe, according to frequency domain position, in turn be divided into the resource group, each resource group comprises four Resource Units, and, set up the corresponding relation between resource group and the Resource Unit to the frequency domain position serial number of resource group according to Resource Unit:

Y (0) ... y (3) is mapped to and is numbered k ₀The resource group on, k ₀=k ₀

Y (4) ... y (7) is mapped to and is numbered k ₁The resource group on,

Y (8) ... y (11) is mapped to and is numbered k ₂The resource group on,

Y (12) ... y (15) is mapped to and is numbered k ₃The resource group on,

Wherein, Y (0) ... y (15) presentation code modulation back downlink control signaling indication channel data, N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

At last, again according to the corresponding relation of resource group and Resource Unit, with descending control format indicating channel data map to corresponding Resource Unit.

(4) the 4th kinds of downlink control signaling indication channel to physical resource mapping specific as follows:

With residual resource unit after the removal pilot tone on first OFDM symbol in the subframe, according to frequency domain position, in turn be divided into the resource group, each resource group comprises four Resource Units, and, set up the corresponding relation between resource group and the Resource Unit to the frequency domain position serial number of resource group according to Resource Unit:

Y (0) ... y (3) is mapped to and is numbered k ₀The resource group on, k ₀=k ₀

Y (4) ... y (7) is mapped to and is numbered k ₁The resource group on,

Y (8) ... y (11) is mapped to and is numbered k ₂The resource group on,

Y (12) ... y (15) is mapped to and is numbered k ₃The resource group on,

Wherein, ${\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="S2007103013535E00011.png,S2007103013535E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_0=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}(2\&times;N_{\mathrm{RB}}^{\mathrm{DL}});$ Y (0) ... y (15) presentation code modulation back downlink control signaling indication channel data, N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

At last, again according to the corresponding relation of resource group and Resource Unit, with descending control format indicating channel data map to corresponding Resource Unit.

The mapping method of a kind of physical channel provided by the invention, by the packet map rule in the mapping of definition LTE system descending control format indication channel to physical resource, avoid surplus resources can not all be divided into the situation that the resource group is distributed, thereby obtain maximum usage factor of system resource.

Description of drawings

Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the schematic diagram of Resource Block and Resource Unit in 3GPP LTE (bandwidth 5M) system;

Fig. 2 is a descending control format indicating channel mapping schematic diagram in 3GPP LTE (bandwidth 5M) system of prior art correspondence;

Fig. 3 is a descending control format indicating channel mapping schematic diagram in 3GPP LTE (bandwidth 5M) system of example 1 correspondence of the present invention;

Fig. 4 is a descending control format indicating channel mapping schematic diagram in 3GPP LTE (bandwidth 5M) system of example 2 correspondences of the present invention;

Fig. 5 is a descending control format indicating channel mapping schematic diagram in 3GPP LTE (bandwidth 5M) system of example 3 correspondences of the present invention;

Fig. 6 is a descending control format indicating channel mapping schematic diagram in 3GPP LTE (bandwidth 5M) system of example 4 correspondences of the present invention.

Embodiment

Implement to describe in detail the inventive method below in conjunction with the contrast of the present invention and prior art:

With 3GPP LTE (bandwidth 5M) system is example, as shown in Figure 1, LTE 5M bandwidth is descending to contain 512 subcarriers altogether, and wherein available subcarrier is middle 300, each Resource Block contains continuous 12 subcarriers, and then 5M bandwidth one has 25 Resource Block (odd number).

Suppose that the ID of Target cell is that the original position of pilot tone on 13, the first antennas is the 3rd subcarrier, then:

One, prior art

The method for expressing of descending control format indication channel to physical resource mapping is as follows:

NRBDL represents the quantity of system resource block, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block frequency domain comprises, N _ID ^CellBe the proprietary ID in each sub-district,

${\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="S2007103013535E00011.png,S2007103013535E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_0=(N_{\mathrm{sc}}^{\mathrm{RB}}/2)\&times;\left(N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}(2\&times;N_{\mathrm{RB}}^{\mathrm{DL}})\right)=(12/2)\&times;\left(13\mathrm{mod}(2\&times;25)\right)=78;$

As shown in Figure 2, encoded modulation back descending control format indicating channel data y (0) ... y (15) is mapped to and is numbered 3,4, and 6,7 and 78,79,81,82, and 153,154,156,157 and 228,229, on 231,232 the Resource Unit.

Because on first OFDM symbol of subframe, be that base unit carries out resource allocation with 4 continuous resource unit, so, being numbered 0 and 1 Resource Unit and just can't using, corresponding set of available resources number has also reduced, and simultaneously, has also reduced resource utilization ratio.

Two, the present invention

(1) example 1

The method for expressing of descending control format indication channel to physical resource mapping is as follows:

N _RB ^DLThe quantity of expression system resource block, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block frequency domain comprises, N _ID ^CellBe the proprietary ID in each sub-district,

As shown in Figure 3, encoded modulation back descending control format indicating channel data y (0) ... y (15) is mapped to and is numbered 6,7, and 9,10 and 78,79,81,82, and 150,151,153,154 and 222,223, on 225,226 the Resource Unit.

(3) example 2

The method for expressing of descending control format indication channel to physical resource mapping is as follows:

N _RB ^DLThe quantity of expression system resource block, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block frequency domain comprises, N _ID ^CellBe the proprietary ID in each sub-district,

${\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="S2007103013535E00011.png,S2007103013535E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_0=(N_{\mathrm{sc}}^{\mathrm{RB}}/2)\&times;\left(N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}(2\&times;N_{\mathrm{RB}}^{\mathrm{DL}})\right)=(12/2)\&times;\left(13\mathrm{mod}(2\&times;25)\right)=78;$

Then:

k ₂＝(78+(12/2)×2×25/2)mod(12×25)＝222；

Then:

k ₃＝(78+(12/2)×3×25/2)mod(12×25)＝294；

As shown in Figure 4, encoded modulation back descending control format indicating channel data y (0) ... y (15) is mapped to and is numbered 78,79, and 81,82 and 150,151,153,154, and 222,223,225,226 and 294,295, on 297,298 the Resource Unit.

(3) example 3

The method for expressing of descending control format indication channel to physical resource mapping is as follows:

The residual resource unit always has 200 after removing pilot tone on first OFDM symbol in the subframe, and 4 Resource Units are a resource group, and 50 of resource groups are always arranged, and are numbered #0, #1 ... #199;

N _RB ^DLThe quantity of expression system resource block, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block frequency domain comprises, N _ID ^CellBe the proprietary ID in each sub-district,

Encoded modulation back descending control format indicating channel data y (0) ... y (15) is mapped to and is numbered 1,13, on 25 and 37 the resource group, the Resource Unit of these resource group correspondences is numbered 6,7, and 9,10 and 78,79,81,82, and 150,151,153,154 and 222,223,225,226, final, as shown in Figure 5, y (0) ... y (15) is mapped on the Resource Unit of above-mentioned numbering.

(4) example 4

The method for expressing of descending control format indication channel to physical resource mapping is as follows:

The residual resource unit always has 200 after removing pilot tone on first OFDM symbol in the subframe, and 4 Resource Units are a resource group, and 50 of resource groups are always arranged, and are numbered #0, #1 ... #199;

N _RB ^DLThe quantity of expression system resource block, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block frequency domain comprises, N _ID ^CellBe the proprietary ID in each sub-district,

${\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="S2007103013535E00011.png,S2007103013535E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}_0=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}(2\&times;N_{\mathrm{RB}}^{\mathrm{DL}})=13\mathrm{mod}(2\&times;25)=13;$

Encoded modulation back descending control format indicating channel data y (0) ... y (15) is mapped to and is numbered 1,13, on 25 and 37 the resource group, the Resource Unit of these resource group correspondences is numbered 78,79, and 81,82 and 150,151,153,154, and 222,223,225,226 and 294,295,297,298, final, as shown in Figure 6, y (0) ... y (15) is mapped on the Resource Unit of above-mentioned numbering.

From above-mentioned four examples 1～4 as can be seen the present invention by redefining the packet map rule, descending control format indicating channel is mapped on continuous 4 Resource Units that overlap with the resource group of whole system physical resources except that pilot tone being divided by continuous 4 Resource Units just, avoid surplus resources can not all be divided into the situation that the resource group is distributed, thereby obtain maximum usage factor of system resource.

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 changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. the mapping method of a physical channel, with the descending control format indicating channel data y (0) after 16 modulation of LTE system, y (1), ... y (15) is divided into 4 groups and packet map in proper order by front and back, it is characterized in that, descending control format indicating channel is mapped on continuous 4 Resource Units that overlap with the resource group of whole system physical resources except that pilot tone being divided by continuous 4 Resource Units just.

2. according to the described mapping method of claim 1, it is characterized in that described packet map is:

First group of y (0) ... y (3) is mapped to k ₀Be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

Second group of y (4) ... y (7) is mapped to { k ₀+ (N _Sc ^RB/ 2) *  N _RB ^DL/ 2  } be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

The 3rd group of y (8) ... y (11) is mapped to { k ₀+ (N _Sc ^RB/ 2) * 2 *  N _RB ^DL/ 2  } be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

The 4th group of y (12) ... y (15) is mapped to { k ₀+ (N _Sc ^RB/ 2) * 3 *  N _RB ^DL/ 2  } be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

Wherein:

N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

3. according to the described mapping method of claim 1, it is characterized in that described packet map is:

First group of y (0) ... y (3) is mapped to k ₀Be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

Second group of y (4) ... y (7) is mapped to { (k ₀+ (N _Sc ^RB/ 2) *  N _RB ^DL/ 2 ) mod (N _Sc ^RB* N _RB ^DL) be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

The 3rd group of y (8) ..y (11) is mapped to { (k ₀+ (N _Sc ^RB/ 2) * 2 *  N _RB ^DL/ 2 ) mod (N _Sc ^RB* N _RB ^DL) be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

The 4th group of y (12) ... y (15) is mapped to { (k ₀+ (N _Sc ^RB/ 2) * 3 *  N _RB ^DL/ 2 ) mod (N _Sc ^RB* N _RB ^DL) be original position, remove in the system physical resource of pilot tone on continuous 4 Resource Units;

Wherein: $k_0=(N_{\mathrm{sc}}^{\mathrm{RB}}/2)\&times;\left(N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}(2\&times;N_{\mathrm{RB}}^{\mathrm{DL}})\right),$ N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

4. according to the described mapping method of claim 1, it is characterized in that, with residual resource unit after the removal pilot tone on first OFDM symbol in the subframe, according to frequency domain position, in turn be divided into the resource group, each resource group comprises four Resource Units, and to the frequency domain position serial number of resource group according to Resource Unit, set up corresponding relation and final corresponding relation between resource group and the Resource Unit according to resource group and Resource Unit, to corresponding Resource Unit, described packet map is with descending control format indicating channel data map:

First group of y (0) ... y (3) is mapped to and is numbered k ₀The resource group on;

Second group of y (4) ... y (7) is mapped to and is numbered { k ₀+  N _RB ^DL/ 2  } the resource group on;

The 3rd group of y (8) ... y (11) is mapped to and is numbered { k ₀+ 2 *  N _RB ^DL/ 2  } the resource group on;

The 4th group of y (12) ... y (15) is mapped to and is numbered { k ₀+ 3 *  N _RB ^DL/ 2  } the resource group on;

Wherein:

N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

5. according to the described mapping method of claim 1, it is characterized in that, with residual resource unit after the removal pilot tone on first OFDM symbol in the subframe, according to frequency domain position, in turn be divided into the resource group, each resource group comprises four Resource Units, and to the frequency domain position serial number of resource group according to Resource Unit, set up corresponding relation and final corresponding relation between resource group and the Resource Unit according to resource group and Resource Unit, to corresponding Resource Unit, described packet map is with descending control format indicating channel data map:

First group of y (0) ... y (3) is mapped to and is numbered k ₀The resource group on;

Second group of y (4) ... y (7) is mapped to and is numbered { (k ₀+  N _RB ^DL/ 2 ) mod (2 * N _RB ^DL) the resource group on;

The 3rd group of y (8) ... y (11) is mapped to and is numbered { (k ₀+ 2 *  N _RB ^DL/ 2 ) mod (2 * N _RB ^DL) the resource group on;

The 4th group of y (12) ... y (15) is mapped to and is numbered { (k ₀+ 3 *  N _RB ^DL/ 2 ) mod (2 * N _RB ^DL) the resource group on;

Wherein: $k_0=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}(2\&times;N_{\mathrm{RB}}^{\mathrm{DL}}),$ N _RB ^DLThe quantity of Resource Block in the expression system bandwidth, N _Sc ^RBThe quantity of representing the Resource Unit that a Resource Block comprises, N _ID ^CellBe the proprietary ID in each sub-district.

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