CN101399761B - Method for mapping resource units onto resource blocks for long term evolution system - Google Patents

Abstract

The invention discloses a method for a long-term evolutionary system to map a resource unit to a resource block; the method comprises the following steps: all available sub-carriers are divided into N RB DL resource blocks with the same size and every resource block comprises N symb DL continuous orthogonal frequency division multiplexing symbols; N sc RB continuous sub-carriers in every orthogonal frequency division multiplexing symbol are included in the resource block, thus every orthogonal frequency division multiplexing symbol comprises N symb DL*N sc RB resource units; the available sub-carriers are respectively set with a logical number k and the resource blocks are respectively set with a logical number nPRB and the orthogonal frequency division multiplexing symbols are respectively set with a logical number l; the combination of the logical numbers of the sub-carrier and the orthogonal frequency division multiplexing symbol is used for representing the resource unitwith the range of k from 0 to N RB DL*N sc RB-1 and the range of l from 0 to N symb DL-1; the logical number k of the available sub-carriers and the logical number nPRB of the resource blocks are utilized to map the resource units to the resource blocks.

Description

The method that resource unit mapping is arrived Resource Block that is used for long evolving system

Technical field

The present invention relates to the communications field, relate more specifically to a kind of method that resource unit mapping is arrived Resource Block for long evolving system.

Background technology

Long Term Evolution (Long Term Evolution is called for short LTE) system has mainly used OFDM (Orthogonal Frequency Division Multiplexing is called for short OFDM) technology.In frequency domain, given channel is divided into many orthogonal sub-carriers, at each subcarrier difference modulation signal, and each subcarrier parallel transmission.Like this, although the frequency response curve of wireless channel is non-flat forms, has frequency selectivity, but each subcarrier is relatively flat, what carry out at each subcarrier is narrow band transmission, and signal bandwidth is less than channel width, the therefore greatly interference between the erasure signal waveform.Because each subcarrier in the ofdm system is mutually orthogonal, and their frequency spectrum is overlapped, thus not only reduced the phase mutual interference between subcarrier, and improved the availability of frequency spectrum.In addition, the OFDM technology utilizes inverse discrete fourier transform/discrete Fourier transform (DFT) (IDFT/DFT) to replace multi-carrier modulation and demodulation, has reduced the complexity of Base-Band Processing.

In the LTE system, because resource occurs with time and frequency bidimensional, so resource is distributed and method for expressing becomes more complicated, when especially bandwidth ratio is larger, should consider the flexibility that resource is distributed, consider again the requirements such as size of coherence bandwidth.At present, in the LTE system, stipulate, subframe length in time is 1ms, be comprised of two equal time slots, the time span of each time slot is 0.5ms, and a Resource Unit contains an OFDM symbol, a subcarrier in each OFDM symbol belongs to this Resource Unit, and resource representation method commonly used is basic Resource Block of definition (Resource Block is called for short RB), then carries out resource take RB as unit and distributes.

In the existing Standard Edition of LTE, existing Resource Unit is to the mapping formula of Resource Block, and under specific circumstances, existing problems for this reason, need to propose a kind of new method that resource unit mapping is arrived Resource Block, to be applicable to the needs of various situations.

Summary of the invention

One or more problems in view of the above the invention provides a kind of method that resource unit mapping is arrived Resource Block for long evolving system.

According to of the present invention the method for resource unit mapping to Resource Block be may further comprise the steps: all available subcarriers are divided into N _RB ^DLIndividual equal-sized Resource Block, wherein, each Resource Block comprises N _Symb ^DLIndividual continuous OFDM symbol, the N in each OFDM symbol _Sc ^RBIndividual continuous subcarrier belongs to this Resource Block, and then each Resource Block comprises N _Symb ^DL* N _Sc ^RBIndividual Resource Unit; Be respectively available subcarrier logical number k is set, be respectively Resource Block logical number n is set _PRB, and be respectively OFDM symbol logical number l is set, wherein, the combination of the logical number by available subcarrier and the logical number of OFDM symbol represents Resource Unit, and $k=0,...,N_{\mathrm{RB}}^{\mathrm{DL}}{N}_{\mathrm{sc}}^{\mathrm{RB}}-1,$ $l=0,...,N_{\mathrm{symb}}^{\mathrm{DL}}-1;$ And utilize the logical number k of available subcarrier and the logical number n of Resource Block _PRBResource unit mapping is arrived Resource Block.

Wherein, from the low frequency to the high frequency, order arranges logical number k for available subcarrier, and wherein, k increases in turn since 0.According to time sequencing, for OFDM symbol arranges logical number l, wherein, l increases in turn since 0.

Wherein, when the number N of Resource Block _RB ^DLBe odd number, and Resource Unit place subframe is when being 0 work song frame, by following equation with resource unit mapping to Resource Block:

If $0\≤k\≤\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-7}{2}\·N_{\mathrm{sc}}^{\mathrm{RB}}-1$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-6}{2}\text{\·}{N}_{\mathrm{sc}}^{\mathrm{RB}}\≤k\≤\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+6}{2}\·N_{\mathrm{sc}}^{\mathrm{RB}}-1.$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+7}{2}\·N_{\mathrm{sc}}^{\mathrm{RB}}\≤k\≤N_{\mathrm{RB}}^{\mathrm{DL}}\·N_{\mathrm{sc}}^{\mathrm{RB}}-1$

Alternatively, when the number N of Resource Block _RB ^DLBe odd number, and Resource Unit place subframe is when being 0 work song frame, also can be by following equation with resource unit mapping to Resource Block:

If $0\≤k\≤\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-7}{2}\·N_{\mathrm{sc}}^{\mathrm{RB}}-1$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-6}{2}\·N_{\mathrm{sc}}^{\mathrm{RB}}\≤k\≤\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+6}{2}\·N_{\mathrm{sc}}^{\mathrm{RB}}-1.$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+7}{2}\·N_{\mathrm{sc}}^{\mathrm{RB}}\≤k\≤N_{\mathrm{RB}}^{\mathrm{DL}}\·N_{\mathrm{sc}}^{\mathrm{RB}}$

Alternatively, when the number N of Resource Block _RB ^DLBe odd number, and Resource Unit place subframe is when being 0 work song frame, also can be by following equation with resource unit mapping to Resource Block:

If $0\&le;k<\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k<\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}.$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k<N_{\mathrm{RB}}^{\mathrm{DL}}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}$

In addition, at N _RB ^DLBe even number or N _RB ^DLFor odd number but Resource Unit place subframe is not in the situation of 0 work song frame, by following equation with resource unit mapping to Resource Block:

Resource unit mapping Resource Block can be arrived by the present invention, thereby data can be finished better to the mapping of physical sub-carrier.In addition, the present invention has remedied the shortcoming of the mapping method in original standard, can be used in various situations.

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 method for Resource Block that resource unit mapping is arrived of the embodiment of the invention.

Embodiment

Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.

With reference to figure 1, the method that resource unit mapping is arrived Resource Block according to the embodiment of the invention is described.As shown in Figure 1, the method may further comprise the steps: S102 is divided into N with all available subcarriers _RB ^DLIndividual equal-sized Resource Block, wherein, each Resource Block comprises N _Symb ^DLIndividual continuous OFDM symbol, the N in each OFDM symbol _Sc ^RBIndividual continuous subcarrier belongs to this Resource Block, and then each Resource Block comprises N _Symb ^DL* N _Sc ^RBIndividual Resource Unit; S104 is respectively available subcarrier logical number k is set, and is respectively Resource Block logical number n is set _PRB, and be respectively OFDM symbol logical number l is set, wherein, the combination of the logical number by available subcarrier and the logical number of OFDM symbol represents Resource Unit, and $k=0,...,N_{\mathrm{RB}}^{\mathrm{DL}}{N}_{\mathrm{sc}}^{\mathrm{RB}}-1,$ $l=0,...,N_{\mathrm{symb}}^{\mathrm{DL}}-1;$ And S106, utilize the logical number k of available subcarrier and the logical number n of Resource Block _PRBResource unit mapping is arrived Resource Block.Wherein, the order of step S102 and S104 can be changed, and also can carry out simultaneously.

Wherein, each Resource Block occupies the length of a time slot in time domain, occupy the 180kHz bandwidth at frequency domain.Wherein, from low frequency to high frequency, for each subcarrier arranges a logical number k, k increases in turn since 0; Simultaneously, according to time sequencing, be that each the OFDM symbol in the time slot arranges a logical number l, l increases in turn since 0.The OFDM symbol quantity that comprises in each time slot is N _Symb ^DLEqually, the logical number n of RB _PRBAlso since 0, increase in turn, the Resource Block quantity that comprises in the LTE system is N _RB ^DL

Wherein, the Resource Block quantity N that in the LTE system, comprises _RB ^DLBe odd number, and Resource Unit place subframe is mapped to Resource Block n by following equation with Resource Unit (k, l) when being 0 work song frame _PRB:

If $0\&le;k\&le;\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}-1$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k\&le;\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}-1.$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k\&le;N_{\mathrm{RB}}^{\mathrm{DL}}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}-1$

Above mapping equation also can be rewritten as following form:

If $0\&le;k\&le;\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}-1$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k\&le;\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}-1$ Or

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k<N_{\mathrm{RB}}^{\mathrm{DL}}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}$

If $0\&le;k<\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}-6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k<\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+6}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}.$

If $\frac{N_{\mathrm{RB}}^{\mathrm{DL}}+7}{2}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}\&le;k<N_{\mathrm{RB}}^{\mathrm{DL}}\&CenterDot;N_{\mathrm{sc}}^{\mathrm{RB}}$

At this moment, for equaling ((N _RB ^DL-1) resource block logic numbering/2)+3 does not have Resource Unit corresponding.

At N _RB ^DLBe even number or N _RB ^DLFor odd number but Resource Unit place subframe is not in the situation of 0 work song frame, by following equation Resource Unit (k, l) is mapped to Resource Block n _PRB:

The above is embodiments of the 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 the claim scope of the present invention.

Claims (5)

1. a method that resource unit mapping is arrived Resource Block that is used for long evolving system is characterized in that, may further comprise the steps:

All available subcarriers are divided into

Individual equal-sized Resource Block, wherein, each described Resource Block comprises

Individual continuous OFDM symbol, in each described OFDM symbol Individual continuous subcarrier belongs to described Resource Block, and then each described Resource Block comprises

Individual Resource Unit;

Be respectively described available subcarrier logical number k is set, be respectively described Resource Block logical number n is set _PRB, and be respectively described OFDM symbol logical number l is set, wherein, the combination of the logical number by described available subcarrier and the logical number of described OFDM symbol represents described Resource Unit, and

And

Utilize the logical number k of described available subcarrier and the logical number n of described Resource Block _PRBDescribed resource unit mapping is arrived described Resource Block.

2. method according to claim 1 is characterized in that, from the low frequency to the high frequency, order arranges logical number k for described available subcarrier, and wherein, k increases in turn since 0.

3. method according to claim 2 is characterized in that, according to time sequencing, for described OFDM symbol arranges logical number l, wherein, l increases in turn since 0.

4. each described method in 3 according to claim 1 is characterized in that, when the number of described Resource Block Be odd number, and described Resource Unit place subframe is when being 0 work song frame, by following equation with described resource unit mapping to described Resource Block:

If

If

If

5. each described method in 3 according to claim 1 is characterized in that,

For odd number but Resource Unit place subframe is not 0 work song frame, perhaps

In the situation for even number, by following equation described resource unit mapping is arrived described Resource Block:

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