CN102547865A - Asymmetric carrier aggregation method - Google Patents

Abstract

The invention provides an asymmetric carrier aggregation method which specifically comprises the following steps of: assuming that n downlink frequency bands, 1 uplink frequency band and n natural numbers exist in an LTE (long term evolution) FDD (frequency division duplex) system performing asymmetric carrier aggregation, wherein the unilateral bandwidth of an uplink control signaling of the uplink frequency band corresponding to the ith downlink frequency band is BWPUCCH_i, 1<=i<=n, and the center frequency point of the uplink frequency band is f0; and setting the center frequency point of the uplink frequency band corresponding to the first downlink unit carrier as: FORMULA; and setting the center frequency point of the uplink frequency band corresponding to the ith downlink unit carrier except the first downlink unit carrier as: FORMULA. The method provided by the invention has the beneficial effects that: a staggered PUCCH (physical uplink control channel) structure can be formed when the downlink unit carriers are more that uplink unit carriers so as to realize compatibility of each downlink unit carrier with a terminal.

Description

A kind of method of asymmetric carrier aggregation

Technical field

The present invention relates to the frequency band mapping method in a kind of wireless telecommunications, particularly a kind of method that a plurality of downstream bands is mapped to the asymmetric carrier aggregation of a upstream band.

Background technology

In 3GPP Release 8 (R8) Long Term Evolution (LTE) system, ascending control channel PUCCH is positioned at the both sides of upstream band, and mid portion is uplink data channels PUSCH, and is as shown in Figure 1.

Wherein, ascending control channel PUCCH can be used for sending and the corresponding uplink ACK of downlink data transmission/NACK feedback information.In the transmission course of downlink data; The schedule information of downlink data is sent in the base station on down control channel PDCCH; Carry out the reception of downlink data according to this schedule information terminal, feeding back ACK/nack message on ascending control channel PUCCH is accomplished the receiving course of downlink data with this then.

In the system design of 3GPP R8LTE; There is fixing implication relation one to one between the PDCCH of the schedule information that the terminal is used to send the PUCCH physical resource of uplink ACK/nack message and carry corresponding downlink data; That is to say; In the process of downlink data receiving, the terminal will be according to the position of the PUCCH of the unique definite transmission uplink ACK/NACK of the call number of the PDCCH that carries downlink data dispatching information.

" carrier aggregation " is a kind of technology that improves system peak rate and spectrum utilization flexibility; Wherein, The a plurality of continuous or discrete unit carrier waves of process binding in a system; Can realize the integration use of bigger system bandwidth and discrete frequency range, Fig. 2 and Fig. 3 are respectively the expressions about the example of continuous and discontinuous carrier polymerization.

Simultaneously, for LTE FDD system, according to the actual operating position of frequency spectrum; This spectrum aggregating possibly be asymmetric, that is to say, unit carrier number descending and up polymerization is different; For example: in a system; Descending polymerization two frequency bands, and up be a frequency band, as shown in Figure 4.

When LTE FDD carries out carrier aggregation, in order to keep the compatibility of each downstream units carrier wave to the R8LTE terminal, each downstream bands will keep Downlink Control Information PDCCH separately, will keep the PDCCH of R8LTE and the mapping ruler between the PUCCH simultaneously.At this moment, if the number of asymmetrical polymerization and downstream units carrier wave is greater than the number of upstream cell carrier wave, intrinsic according to R8LTE so mapping ruler, the PDCCH that has same index number on the different frequency bands will be mapped on the identical PUCCH resource.With Fig. 4 is example, and the PDCCH that has same index number in " downstream bands " and " downstream bands " will be mapped on the identical PUCCH resource of upstream band, thereby cause confusion, and system can't operate as normal.

Summary of the invention

In view of above-mentioned, need a kind ofly can a plurality of downstream bands be mapped to same upstream band and can confusion reigned and overlapping method at present.

Therefore; The present invention proposes a kind of method of asymmetric carrier aggregation; Wherein, have n downstream bands and a upstream band in the asymmetric carrier wave, n is a natural number; In descending carrier broadcasting, to the setting of squinting of upstream band center frequency point, be specially: uplink control signaling " monolateral " bandwidth of supposing the upstream band corresponding with i downstream bands is set to BW _{PUCCH_i}, 1≤i≤n wherein; The center frequency point of upstream band is f0, and the center frequency point of the upstream band that first downstream units carrier wave is broadcasted is decided to be

$\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000040244260000021.png,HDA0000040244260000022.png"\; state="\{\{state\}\}">f</figure-callout>}1=f0-\frac{{\mathrm{BW}}_{\mathrm{PUCCH}\_2}+{\mathrm{BW}}_{\mathrm{PUCCH}\_3}+...+{\mathrm{BW}}_{\mathrm{PUCCH}\_\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000040244260000021.png,HDA0000040244260000022.png"\; state="\{\{state\}\}">n</figure-callout>}}}{2},$

The center frequency point of the upstream band that will be broadcasted except first i downstream units carrier wave downstream units carrier wave is decided to be

$\mathrm{fi}=f0-\frac{\underset{m=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{BW}}_{\mathrm{PUCCH}\_m}-{\mathrm{BW}}_{\mathrm{PUCCH}\_\mathrm{<figure-callout\; id="2"\; label="i"\; filenames="HDA0000040244260000021.png,HDA0000040244260000022.png"\; state="\{\{state\}\}">i</figure-callout>}}}{2}+\underset{m=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\mathrm{BW}}_{\mathrm{PUCCH}\_m}.$

Wherein, this method can be used for LTE FDD system.

Therefore; Beneficial effect of the present invention is and can carries out the asymmetrical carrier aggregation of up-downgoing in LTE FDD system; And under the situation of downstream units carrier number greater than the upstream cell carrier number; To settings of squinting of the upstream band center frequency point of each descending carrier broadcasting, form the PUCCH structure of interlocking, realize the compatibility of each downstream units carrier wave to the terminal.

Below in conjunction with accompanying drawing, specific embodiments of the invention is done further to specify.For the person of ordinary skill in the field, from detailed description of the invention, above-mentioned and other purposes of the present invention, feature and advantage will be obvious.

Description of drawings

Fig. 1 is uplink data channels and the distribution of ascending control channel of expression in the upstream band.

Fig. 2 representes that 5 continuous carrier polymerizations form the sketch map of the system bandwidth of 100MHz.

Fig. 3 representes that 2 discontinuous carrier polymerizations form the sketch map of the system bandwidth of 40MHz.

Fig. 4 representes the asymmetric carrier aggregation of FDD.

Control signaling structure when Fig. 5 representes that downstream bands is two.

Control signaling structure when Fig. 6 representes that downstream bands is three.

Embodiment

A kind ofly control signaling structure and the method that n downstream bands is mapped to a upstream band is done further to specify of the present invention below in conjunction with accompanying drawing and specific embodiment.

The present invention at first proposes a kind of uplink control signaling project organization of alternating expression; Be that one and downstream bands are when being a plurality of just in upstream band; When a plurality of downstream bands are mapped to upstream band, produce and be mapped to same PUCCH resource and the phenomenon of confusion reigned, on each downstream units carrier wave, send downlink broadcast channel separately, wherein carried information about the upstream band center frequency point; Through these information; To the setting of squinting of the center frequency point of the corresponding upstream band of each downstream units carrier wave, be specially: suppose to have n downstream bands, 1 upstream band; Uplink control signaling " monolateral " bandwidth of the upstream band corresponding with i downstream bands is set to BW _{PUCCH_i}, 1≤i≤n wherein, this uplink control signaling bandwidth is provided with by system's high-level signaling, has reflected needed uplink control signaling data volume, and its concrete numerical value is relevant with factors such as downlink data amount, downlink business types; The center frequency point of upstream band is f0

The center frequency point of the 1st upstream band that the downstream units carrier wave is broadcasted is decided to be

$\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000040244260000021.png,HDA0000040244260000022.png"\; state="\{\{state\}\}">f</figure-callout>}1=f0-\frac{{\mathrm{BW}}_{\mathrm{PUCCH}\_2}+{\mathrm{BW}}_{\mathrm{PUCCH}\_3}+...+{\mathrm{BW}}_{\mathrm{PUCCH}\_\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000040244260000021.png,HDA0000040244260000022.png"\; state="\{\{state\}\}">n</figure-callout>}}}{2},$

The center frequency point of the upstream band that i downstream units carrier wave broadcasted is decided to be

$\mathrm{fi}=f0-\frac{\underset{m=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{BW}}_{\mathrm{PUCCH}\_m}-{\mathrm{BW}}_{\mathrm{PUCCH}\_\mathrm{<figure-callout\; id="2"\; label="i"\; filenames="HDA0000040244260000021.png,HDA0000040244260000022.png"\; state="\{\{state\}\}">i</figure-callout>}}}{2}+\underset{m=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\mathrm{BW}}_{\mathrm{PUCCH}\_m}$

Thereby keeping under the situation of each downstream units carrier wave to the compatibility at LTE terminal, realizing the asymmetrical carrier aggregation of downstream units carrier number greater than the upstream cell carrier number.

As shown in Figure 5, when being illustrated in downstream bands and being two, the center frequency point of supposing the system is f0 respectively, is respectively BW with downstream bands 1,2 corresponding uplink control signaling " monolateral " bandwidth _{PUCCH_1}And BW _{PUCCH_2}Can insert two downstream bands in order to make the terminal; To all send downlink broadcast information to two downstream bands; The information that has wherein comprised the center frequency point of corresponding upstream band; In the present embodiment; Center frequency point f0 with respect to whole upstream band; Through first downstream bands and second downstream bands are broadcasted different up frequency point information respectively; Wherein, As shown in Figure 5, the up center frequency point that the up center frequency point of first downstream bands broadcasting is broadcasted the second descending frequency for

has formed the staggered rehearsal that on frequency domain, satisfies the R8 rule with two corresponding ascending control channels of downstream bands like this for , realized the transparent backwards compatibility in R8LTE terminal.

As shown in Figure 6; The present invention also is applicable to three downstream bands and has only the situation of a upstream band, to the up center frequency point of first downstream bands broadcasting be the broadcasting of second downstream bands up center frequency point for

the 3rd downstream bands broadcast up center frequency point is

Like this; Up-downgoing is asymmetric in the LTE system; And under the situation of downstream units carrier number greater than the upstream cell carrier number; To settings of squinting of the upstream band center frequency point of each descending carrier broadcasting, form the PUCCH structure of interlocking, realize the compatibility of each downstream units carrier wave to the R8LTE terminal.

The above is merely preferred embodiment of the present invention, is not to be used for limiting practical range of the present invention; If do not break away from the spirit and scope of the present invention, the present invention is made amendment or is equal to replacement, all should be encompassed in the middle of the protection range of claim of the present invention.

Claims (2)

1. the method for an asymmetric carrier aggregation is characterized in that:

Have n downstream bands and 1 upstream band in the asymmetric carrier wave; N is a natural number; In descending carrier broadcasting, to the setting of squinting of upstream band center frequency point, be specially: the monolateral bandwidth of uplink control signaling of supposing the upstream band corresponding with i downstream bands is set to BW _{PUCCH_i}, 1≤i≤n wherein; The center frequency point of upstream band is f0, and the center frequency point of the upstream band that first downstream units carrier wave is broadcasted is decided to be

$f1=f0-\frac{{\mathrm{BW}}_{\mathrm{PUCCH}\_2}+{\mathrm{BW}}_{\mathrm{PUCCH}\_3}+...+{\mathrm{BW}}_{\mathrm{PUCCH}\_n}}{2},$

The center frequency point of the upstream band that will be broadcasted except first i downstream units carrier wave downstream units carrier wave is decided to be

$\mathrm{fi}=f0-\frac{\underset{m=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{BW}}_{\mathrm{PUCCH}\_m}-{\mathrm{BW}}_{\mathrm{PUCCH}\_i}}{2}+\underset{m=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\mathrm{BW}}_{\mathrm{PUCCH}\_m}.$

2. the method for a kind of asymmetric carrier aggregation according to claim 1, it is characterized in that: this method is used for LTE FDD system.

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