CN101588631B - Method for controlling channel resource allocation - Google Patents

Abstract

The invention provides a method for controlling channel resource allocation, comprising the following steps: usable physical resources of physical control channels are grouped, wherein each group of usable physical resources is used as a minimum unit of physically controlled channel allocation and called as a physical resource group; a physical number is allocated for each physical resource group,and the physical resource group are physically numbered according to frequency sequence thereof; the physical resource groups are logically allocated to the physical control channels, wherein each ph ysical control channel comprises a plurality of logical physical resource groups; the logical physical resource groups are logically numbered, wherein the physical resource groups of the physical control channels with the same type are serially numbered; the logical numbers are mapped by a bit turnover method, wherein a value obtained by mapping is a physical number of the physical resource group corresponding to the logical number; and the physical resource group corresponding to the physical number obtained by mapping is allocated to the physical control channel.

Description

A kind of control channel resource allocation methods

Technical field

The present invention relates to a kind of control channel resource allocation methods of LTE (Long Term Evolution, Long Term Evolution) system.

Background technology

In 3GPP (third generation partner program) LTE project, the up-downgoing wireless channel adopts OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology, distributed in grid is adopted in the distribution of the physical resource of up-downgoing channel, as shown in Figure 1.

In Fig. 1, each lattice is represented least unit RE (the Resource Element of resource allocation, resource element), according to existing 3GPP protocol definition, downlink physical control channel has PBCH (Physical broadcast channel, Physical Broadcast Channel), PCFICH (Physical control format indicator channel, Physical Control Format Indicator Channel), PHICH (Physical hybrid-ARQ indicator channel, Physical HARQ Indicator Channel) and PDCCH (Physical downlink control channel, Physical Downlink Control Channel), wherein, clearly defined its resource distribution mode in the PBCH agreement, do not belonged to this method category is discussed.Three kinds of physical control channels then, their physical resource distribution of definition must per 4 RE be a continuous distribution in the agreement, so, the least unit of the physical source distributing of PCFICHPHICH and PDCCH is 4 continuous RE, be referred to as miniCCE (mini Control Channel Element, control channel element) in this article.

A biggest advantage in the OFDM technology of LTE is exactly the anti-interference effect of frequency diversity, therefore, control channel in same cells keeps bigger distribution distance each other as far as possible on frequency domain, being at first needs the problem considered in the resource allocation of LTE downlink physical control channel.

Summary of the invention

The technical problem to be solved in the present invention is to propose a kind of physical control channel resource allocation methods, to reduce adjacent in logic control channel interfering with each other on frequency domain.

In order to solve the problems of the technologies described above, the invention provides a kind of control channel resource allocation methods, comprise following steps:

The available physical resources of physical control channel is divided into groups, and every group is the least unit that physical control channel distributes, and is called a physical resource group, is physics numbering of each physical resource set of dispense, carries out the physics numbering by the frequency order of physical resource group;

For physical control channel distributes the physical resource group in logic, each physical control channel comprises several physical resource groups in logic, and this physical resource group in logic carried out logical number, wherein, the logical number of its physical resource group of the physical control channel of same type is continuous;

Adopt the bit reversal method to shine upon logical number, the value that mapping obtains is the physics numbering of the corresponding physical resource group of this logical number;

The physics that described mapping obtains is numbered the described physical control channel of corresponding physical set of resources dispensing.

Further, said method also can have following characteristics, described physical control channel is physical mixed automatic re-transmission indicating channel PHICH and physical downlink control channel PDCCH, and the logical number of the physical resource group of PHICH is continuous, and the logical number of the physical resource group of PDCCH is continuous.

Further, said method also can have following characteristics, and each physical resource group comprises resource element RE continuous on four frequency domains.

Further, said method also can have following characteristics, and the available physical resources of described physical control channel is the radio physical resource of removing behind the physical resource that reference signal and Physical Control Format Indicator Channel PCFICH take.

Further, said method also can have following characteristics, and each physical resource group is carried out physics when numbering, from shared first physical resource group of PCFICH continuous next physical resource group open numbering on frequency domain.

Further, said method also can have following characteristics, has P physical resource group, and its physics is numbered 0,1,2,3 ..., P-1 needs to distribute M physical resource group to give PHICH and PDCCH, and its logical number is 0,1,2,3 ..., M-1, M is smaller or equal to P; Logical number is carried out the mapping of bit reversal method obtains the physics numbering, mainly comprise following steps:

Step 10 is provided with i=0, j=0;

Step 20 converts j to binary system, and its number of bits is

Expression rounds up, and obtains binary number a, and the number of bits of a is overturn, and obtains binary number b, and b is converted to decimal number Y;

Step 30 compares Y and P, if Y＜P, then the physics of the physical resource group of logical number i is numbered X=Y, and i increases by 1, jumps to step 40, if Y 〉=P jumps to step 40;

Step 40, j increases by 1, if i＜M then forwards step 20 to, otherwise, finish.

Method of the present invention can guarantee in same cells, and the adjacent in logic control channel frequency domain of same type keeps big as far as possible distance, to reduce the diversity effect of interference and increase OFDM technology.

Description of drawings

When Fig. 1 is the LTE system/frequency physical channel resources distributed in grid schematic diagram;

Fig. 2 is a physical control channel resource allocation methods flow chart of the present invention;

Fig. 3 is a resource mapped bits inversion method flow chart of the present invention;

Fig. 4 is the adjacent miniCCE physics frequency domain maximum/minimum/average distance schematic diagram of logic.

Embodiment

The present invention proposes a kind of downlink physical control channel resource allocation methods, in the method, by physical channel being carried out logical number and physics numbering, adopt the bit reversal method that corresponding logical number is mapped to the physics numbering, thereby make the interference minimum.

The method of the invention mainly comprises following steps as shown in Figure 2:

Step 10, RS (Reference Signal will be removed in the radio physical resource, reference signal) RE, being one group with 4 RE divides, continuous RE is one group on per 4 frequency domains, promptly a miniCCE or be called the least unit that physical control channel distributes is called a physical resource group with a miniCCE;

Step 20 at first according to the agreement regulation, is distributed the PCFICH frequency resource, removes the shared miniCCE of PCFICH, and remaining all is to keep miniCCE, and promptly available physical resource can be distributed to PHICH and PDCCH and use;

Step 30, carry out the physics numbering for keeping miniCCE, wherein initial miniCCE (being numbered 0) gets first shared miniCCE of PCFICH (4 continuous RE on the frequency domain) continuous next miniCCE on frequency domain, physics is numbered 0,1, and 2,3, ..., P-1, wherein P is the number of the miniCCE that comprises in the physical resource; Frequency order by physical resource group (miniCCE) carries out the physics numbering, and is consistent with the frequency order of miniCCE or opposite such as the order of physics numbering; Be that frequency is big more, number greatly more that or frequency is big more, numbers more little.

Step 40, for physical control channel distributes the physical resource group in logic, each physical control channel comprises several physical resource groups in logic, and this physical resource group is in logic carried out logical number, wherein, the logical number of its physical resource group of the physical control channel of same type is continuous;

Because of the priority of PHICH is higher than the priority of PDCCH, adopt the assignment order of PDCCH behind the first PHICH, obtain the logical number of miniCCE, suppose that PHICH need take N miniCCE altogether, PDCCH need take M miniCCE altogether, and the logical number of miniCCE is 0 so, 1,2 ..., N-1, N, N+1 ..., N+M-1, wherein N+M is smaller or equal to P;

Step 50 adopts the bit reversal method to shine upon logical number, and the value that mapping obtains is the physics numbering of the corresponding physical resource group of this logical number;

Adopt BRI (Bit-reversal Interleaver, the bit reversal method) mapping method, logic miniCCE numbering is mapped as physics miniCCE numbering, when carrying out the BRI mapping, maximum bit number is relevant with maximum miniCCE that system supports, suppose that P is the number of maximum miniCCE of comprising in the physical resource, among the BRI, the bit number that needs is so

Wherein,

Expression rounds up;

The BRI mapping method specifically comprises following steps as shown in Figure 3:

Step 501 is provided with

Step 502 is provided with i=0, and the logical number of sign miniCCE is provided with j=0;

Step 503 converts j to binary system, and the bit figure place is n, obtains binary number a, and this process is with equation a=dec2bin (j, n) sign;

Step 504, the bit figure place of binary number a is overturn, obtain binary number b, promptly suppose a=0010, first 0 is put into last, and second 0 is put into second from the bottom, be put into second for the 3rd 1, be put into first for the 4th 0, the b=0100 after overturning so, this process identifies with equation b=fliplr (a);

Step 505 converts b to decimal number, represents with equation Y=bin2dec (b);

Step 506, if Y less than P, forwards step 507 to, otherwise, forward step 508 to;

Step 507, the physics that obtains the physical resource of logical number i is numbered X=Y, and i=i+1, jumps to step 508;

Step 508 is provided with j=j+1;

Step 509, if i less than M, jumps to step 503 so, otherwise flow process finishes.

Step 60, mapping are numbered corresponding physical resource group correspondence with physics and are distributed to PHICH and PDCCH after obtaining the physics numbering of physical resource group of each logical number.

The physics that is the logical number mapping is numbered the physical control channel under this logical number in the corresponding physical set of resources dispensing step 40.

When Fig. 4 is P from 8 to 50 variations, frequency domain mapping ultimate range, minimum range and average distance schematic diagram.Abscissa is the miniCCE number, and ordinate is the distance of its physics frequency domain of the adjacent miniCCE of logic, represents with the distance of physics numbering among the figure, can see, its frequency domain of adjacent in logic control channel staggers, and the P value is big more, and the miniCCE frequency domain average distance that logic is adjacent is big more.And adjacent in logic control channel is identical control channel, thereby its frequency of control channel that has guaranteed adjacent in logic same type staggers as far as possible.

In sum, this method can guarantee that in same cells the adjacent in logic control channel frequency domain of same type keeps big as far as possible distance, to reduce the diversity effect of interference and increase OFDM technology.

Claims (6)

1. a control channel resource allocation methods is characterized in that, comprises following steps:

The available physical resources of physical control channel is divided into groups, and every group is the least unit that physical control channel distributes, and is called a physical resource group, is physics numbering of each physical resource set of dispense, carries out the physics numbering by the frequency order of physical resource group;

For physical control channel distributes the physical resource group in logic, each physical control channel comprises several physical resource groups in logic, and this physical resource group in logic carried out logical number, wherein, the logical number of its physical resource group of the physical control channel of same type is continuous;

Adopt the bit reversal method to shine upon logical number, the value that mapping obtains is the physics numbering of the corresponding physical resource group of this logical number;

The physics that described mapping obtains is numbered the described physical control channel of corresponding physical set of resources dispensing.

2. the method for claim 1, it is characterized in that, described physical control channel is physical mixed automatic re-transmission indicating channel PHICH and physical downlink control channel PDCCH, and the logical number of the physical resource group of PHICH is continuous, and the logical number of the physical resource group of PDCCH is continuous.

3. the method for claim 1 is characterized in that, each physical resource group comprises resource element RE continuous on four frequency domains.

4. as claim 1 or 2 or 3 described methods, it is characterized in that the available physical resources of described physical control channel is the radio physical resource of removing behind the physical resource that reference signal and Physical Control Format Indicator Channel PCFICH take.

5. as claim 1 or 2 or 3 described methods, it is characterized in that, each physical resource group is carried out physics when numbering, from shared first physical resource group of PCFICH continuous next physical resource group open numbering on frequency domain.

6. as claim 1 or 2 or 3 described methods, it is characterized in that have P physical resource group, its physics is numbered 0,1,2,3 ..., P-1 needs to distribute M physical resource group to give PHICH and PDCCH, and its logical number is 0,1,2,3 ..., M-1, M is smaller or equal to P; Logical number is carried out the mapping of bit reversal method obtains the physics numbering, mainly comprise following steps:

Step 10 is provided with i=0, j=0;

Step 20 converts j to binary system, and its number of bits is

Expression rounds up, and obtains binary number a, and the number of bits of a is overturn, and obtains binary number b, and b is converted to decimal number Y;

Step 30 compares Y and P, if Y＜P, then the physics of the physical resource group of logical number i is numbered X=Y, and i increases by 1, jumps to step 40, if Y 〉=P jumps to step 40;

Step 40, j increases by 1, if i＜M then forwards step 20 to, otherwise, finish.

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