CN101174869B - Ascending pilot frequency transmitting method - Google Patents
Ascending pilot frequency transmitting method Download PDFInfo
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- CN101174869B CN101174869B CN2006101378037A CN200610137803A CN101174869B CN 101174869 B CN101174869 B CN 101174869B CN 2006101378037 A CN2006101378037 A CN 2006101378037A CN 200610137803 A CN200610137803 A CN 200610137803A CN 101174869 B CN101174869 B CN 101174869B
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- pilot frequency
- portable terminal
- time slot
- time
- ascending
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Abstract
The present invention discloses an uplink pilot transmission method; the method comprises the following steps that the mobile terminal which is used for accessing service indications of broadcasting information in the base station can transmit the uplink pilot channel of the uplink pilot; the mobile terminal calculates the transmission delay according to the powers of a common-controlled channel and a downlink pilot channel; the mobile terminal transmits the uplink pilot according to the confirmed transmission time. With the present invention, the cell coverage radius in the TD-SCDMA system of the downlink pilot Blanking can be maximized and the intelligent antenna correction is optimized.
Description
Technical field
The present invention relates to time division duplex-S-CDMA and insert (TD-SCDMA) system, and more particularly, relate to a kind of ascending pilot frequency transmitting method, it can make coverage radius of cell maximization in the TD-SCDMA system that supports descending pilot frequency Blanking, and can optimize smart antenna and proofread and correct.
Background technology
The subframe structure of present widely used TD-SCDMA as shown in Figure 1.With reference to Fig. 1, each subframe comprises three special time slots, that is, descending pilot frequency time slot, protection interval, uplink pilot time slot also comprise seven regular time slots in addition.Long 96 chips of descending pilot frequency time slot, at interval long 96 chips of protection, long 160 chips of uplink pilot time slot.According to existing 3gpp agreement, portable terminal is determined the time of emission ascending pilot frequency: T according to following formula
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 12*16T
C, here, T
TX-UpPCHBe the launch time of UpPCH (ascending pilot frequency) under the portable terminal timing, T
RX-DwPCHBe the reception time started of DwPCH (descending pilot frequency) under the portable terminal timing, 2 Δ t
pIt is the Timing Advance of UpPCH.
But according to the existing 3gpp agreement that does not have the Blanking descending pilot frequency, portable terminal can only be launched the uplink synchronous signature after receiving descending pilot frequency.Launch ascending pilot frequency at once after portable terminal is received descending pilot frequency, and the base station is when receiving the ascending pilot frequency of portable terminal emission just when uplink pilot time slot begins, the distance of portable terminal and antenna for base station is the maximum covering radius of base station.Can obtain the radius of society maximum by calculating can only be
Kilometer, here, the 96th, the number of chips of protection time slot, 1.28 * 10
6Be the spreading rate of TD-SCDMA, 3 * 10
5Be to be the light velocity of unit, multiply by with the kilometer
Be that distance reduces by half because portable terminal is launched ascending pilot frequency after receiving descending pilot frequency again.
By foregoing as can be seen, the covering radius maximum of sub-district has only 11.25 kilometers, therefore needs a kind of maximized technical scheme of covering radius that can make the sub-district.
Summary of the invention
Main purpose of the present invention is to provide a kind of ascending pilot frequency transmitting method and device, and it can make coverage radius of cell maximization in the TD-SCDMA system that supports descending pilot frequency Blanking, and can optimize smart antenna and proofread and correct.
To achieve these goals, the invention provides a kind of ascending pilot frequency transmitting method.
Ascending pilot frequency transmitting method according to the present invention may further comprise the steps: first step, access service class indicating mobile terminal in the broadcast of base station can be launched the ascending pilot channel of ascending pilot frequency, wherein, access service class (ASC, access service class) indicating mobile terminal is only launched ascending pilot frequency at the uplink pilot time slot of empty subframe; Second step, portable terminal is according to the power calculation propagation delay of basic Common Control Channel (P-CCPCH) and downlink pilot frequency channel (DwPCH); Third step, portable terminal are determined the time of emission ascending pilot frequency in empty subframe according to propagation delay; And the 4th step, launch ascending pilot frequency the launch time that portable terminal is determined in third step.
In third step, portable terminal calculates T launch time according to following formula
TX-UpPCH: T
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 12 * 16T
C, wherein, T
RX-DwPCHBe the time started of portable terminal descending pilot frequency regularly, 2 Δ t
pBe the propagation delay of in second step, calculating, that is, and the Timing Advance of ascending pilot frequency, T
CBe the time span of a chip, 12 * 16Tc is that descending pilot frequency time slot adds the protection length of time slot at interval.
In the 4th step, if the launch time of in third step, determining after portable terminal current descending pilot frequency time slot regularly begins the place, then portable terminal is launched the uplink synchronous signature in launch time; If the launch time of determining in third step, then portable terminal began place's emission uplink synchronous signature at current descending pilot frequency time slot before portable terminal current descending pilot frequency time slot regularly.
In first step; when needs carry out the antenna timing; the antenna trimming process began from the moment that the uplink synchronous time slot of real subframe begins; like this; the antenna trimming process is carried out in the uplink synchronous time slot; because the protective effect of GP time slot, the interference of descending pilot frequency is less, so the precision that antenna is proofreaied and correct improves.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that illustrates according to the subframe structure of correlation technique;
Fig. 2 is the flow chart according to the ascending pilot frequency transmitting method of the embodiment of the invention;
Fig. 3 is the block diagram according to the ascending pilot frequency emitting set of the embodiment of the invention; And
Fig. 4 is the schematic diagram according to the uplink synchronous signature emission process of the embodiment of the invention.
Embodiment
Main invention thought of the present invention is under the Blanking of TD-SCDMA scheme, and each base station is periodically in the descending pilot frequency time slot transmitting downstream pilot tone of some subframes, and in other subframe in this cycle transmitting downstream synchronization signatures not.The subframe of transmitting downstream pilot tone is called real subframe, and the subframe of transmitting downstream pilot tone is not called empty subframe.Portable terminal is launched the uplink synchronous signature in empty subframe.Embodiments of the invention utilize the empty subframe characteristics of transmitting downstream pilot tone not in the Blanking of the TD-SCDMA system scheme, just launch ascending pilot frequency after allowing portable terminal in empty subframe, to receive the TS0 time slot, rather than after descending pilot frequency time slot, could launch the uplink synchronous signature, thereby enlarged the maximum covering radius of sub-district.
Describe the present invention below with reference to the accompanying drawings in detail.
First embodiment
At first, with reference to Fig. 2 the first embodiment of the present invention is described.Fig. 2 is the flow chart according to the ascending pilot frequency transmitting method of the embodiment of the invention.
As shown in Figure 2, the ascending pilot frequency transmitting method according to the embodiment of the invention may further comprise the steps:
Step S202, the access service class indicating mobile terminal in the broadcast of base station can be launched the ascending pilot channel of ascending pilot frequency, and wherein, access service class indicating mobile terminal is only launched ascending pilot frequency at the uplink pilot time slot of empty subframe; Step S204, portable terminal is according to the basic Common Control Channel (P-CCPCH) that receives and the power calculation propagation delay of downlink pilot frequency channel (DwPCH); Step S206, portable terminal determine the time of emission ascending pilot frequency in empty subframe according to propagation delay; And step S208, launch ascending pilot frequency the launch time that portable terminal is determined in step S206.
In the present embodiment, suppose that TD-SCDMA uses descending pilot frequency Blanking scheme.At this moment be one-period with eight subframes, four subframes in front are real subframe, and four subframes in back are empty subframe.It is zero subframe that each such cycle starts from subframe numbers, and it is synchronous that the whole network is pressed frame number, and it is synchronous so also to press subframe numbers.Parameter s ize among the ASC that broadcasts in the broadcast of sub-district is set at 8, and Available subchannels is set at 4,5, and 6,7.Portable terminal can only be launched the uplink synchronous signature in empty subframe like this.
Like this, in step S206, portable terminal calculates T launch time according to following formula
TX-UpPCH: T
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 12 * 16T
C, wherein, T
RX-DwPCHBe the time started (annotate, the subframe here is empty subframe, and portable terminal does not receive descending pilot frequency in fact) of portable terminal descending pilot frequency regularly, 2 Δ t
pBe the propagation delay of in step S204, calculating, that is, and the Timing Advance of ascending pilot frequency (UpPCH), T
CBe the time span of a chip, 12 * 16Tc is that descending pilot frequency time slot adds the protection length of time slot at interval.
And, in step S208, if T launch time that in step S206, determines
TX-UpPCHAfter portable terminal current descending pilot frequency time slot regularly began the place, then portable terminal was launched the uplink synchronous signature in launch time; If T launch time that in step S206, determines
TX-UpPCHBefore portable terminal current descending pilot frequency time slot regularly, then portable terminal begins place's emission uplink synchronous signature at current descending pilot frequency time slot, and wherein, Fig. 4 is the schematic diagram that uplink synchronous signature emission process is shown.
Like this, portable terminal emission uplink synchronous signature constantly be the zero hour of portable terminal downlink synchronous pilot frequency regularly the earliest, if Node B receives portable terminal, then Δ t the zero hour at Node B ascending pilot frequency regularly
p=96T
C, can know that thus the distance of portable terminal and base station transmit antennas is
Kilometer, the maximum covering radius of base station has enlarged one times under the method for the present invention than not using.
When the TD-SCDMA system used smart antenna at present, the correction of aerial array was finished in the GP time slot, and descending pilot frequency interference at this moment is bigger, influences the effect that antenna is proofreaied and correct.In the present embodiment; in step S202; when needs carry out the antenna timing; the antenna trimming process began from the moment that the uplink synchronous time slot of real subframe begins; like this, the antenna trimming process is carried out in the uplink synchronous time slot, because the protective effect of GP time slot; the interference of descending pilot frequency is less, so the precision that antenna is proofreaied and correct improves.Usually antenna is proofreaied and correct and is taken 64 chips, and the interval of 160-64=96 chip is arranged after antenna is proofreaied and correct like this.
Second embodiment
With reference to Fig. 3 the second embodiment of the present invention is described below.Fig. 3 is the block diagram according to the ascending pilot frequency emitting set 300 of the embodiment of the invention.
As shown in Figure 3, ascending pilot frequency emitting set according to the embodiment of the invention comprises: indicating module 302, be positioned at base station side, be used for to launch the ascending pilot channel of ascending pilot frequency by the access service class indicating mobile terminal of broadcast, wherein, access service class indicating mobile terminal is only launched ascending pilot frequency at the uplink pilot time slot of empty subframe; Propagation delay calculation module 304 is positioned at mobile terminal side, is used for the power calculation propagation delay according to basic Common Control Channel and downlink pilot frequency channel; Launch time, determination module 306, were positioned at mobile terminal side, were used for determining according to the propagation delay that propagation delay calculation module 304 is calculated the time of emission ascending pilot frequency in empty subframe; And ascending pilot frequency transmitter module 308, be positioned at mobile terminal side, launch ascending pilot frequency in the launch times that determination module 306 is determined by launch time.
Launch time, determination module 306 was according to following formula calculating T launch time
TX-UpPCH: T
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 12 * 16T
C, wherein, T
RX-DwPCHBe the time started of portable terminal descending pilot frequency regularly, 2 Δ t
pBe the propagation delay of in second step, calculating, that is, and the Timing Advance of ascending pilot frequency, T
CBe the time span of a chip, 12 * 16Tc is that descending pilot frequency time slot adds the protection length of time slot at interval.
If the launch time that launch time, determination module 306 was determined, then ascending pilot frequency transmitter module 308 was launched the uplink synchronous signature in launch time after portable terminal current descending pilot frequency time slot regularly begins the place; If the launch time that launch time, determination module 306 was determined, then ascending pilot frequency transmitter module 308 began place's emission uplink synchronous signature at current descending pilot frequency time slot before portable terminal current descending pilot frequency time slot regularly.
Like this, ascending pilot frequency transmitter module 308 emission uplink synchronous signature constantly be the zero hour of portable terminal downlink synchronous pilot frequency regularly the earliest, if Node B receives portable terminal, then Δ t the zero hour at Node B ascending pilot frequency regularly
p=96T
C, can know that thus the distance of portable terminal and base station transmit antennas is
Kilometer has enlarged one times than the maximum covering radius of base station under the situation of not using device of the present invention.
In addition; when needs carry out the antenna timing; indicating module 302 marker antenna trimming processes began from the moment that the uplink synchronous time slot of real subframe begins; like this; the antenna trimming process is carried out in the uplink synchronous time slot; because the protective effect of GP time slot, the interference of descending pilot frequency is less, so the precision that antenna is proofreaied and correct improves.Usually antenna is proofreaied and correct and is taken 64 chips, and the interval of 160-64=96 chip is arranged after antenna is proofreaied and correct like this.
In technical scheme described above, for convenience of explanation, omitted description to repeating part, to avoid unnecessarily making the present invention unclear, those skilled in the art should be understood that described ins and outs are applicable to any embodiment of the present invention.
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. an ascending pilot frequency transmitting method is characterized in that, may further comprise the steps:
First step, access service class indicating mobile terminal in the broadcast of base station can be launched the ascending pilot channel of ascending pilot frequency, wherein, described access service class indicates described portable terminal only to launch ascending pilot frequency at the uplink pilot time slot of empty subframe, wherein, described empty subframe is the subframe of transmitting downstream pilot tone not;
Second step, described portable terminal is according to the power calculation propagation delay of basic Common Control Channel and downlink pilot frequency channel;
Third step, described portable terminal are determined the time of emission ascending pilot frequency in empty subframe according to described propagation delay; And
Launch ascending pilot frequency the launch time that the 4th step, described portable terminal are determined in described third step.
2. ascending pilot frequency transmitting method according to claim 1 is characterized in that, in described third step, described portable terminal calculates described launch time of T according to following formula
TX-UpPCH: T
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 12 * 16T
C, wherein, T
RX-DwPCHBe the time started of portable terminal descending pilot frequency regularly, 2 Δ t
pBe the described propagation delay of in described second step, calculating, that is, and the Timing Advance of ascending pilot frequency, T
CBe the time span of a chip, 12 * 16Tc is that descending pilot frequency time slot adds the protection length of time slot at interval.
3. ascending pilot frequency transmitting method according to claim 1, it is characterized in that, in described the 4th step, if the launch time of determining in described third step, then described portable terminal was launched the uplink synchronous signature in described launch time after portable terminal current descending pilot frequency time slot regularly begins the place; If the launch time of determining in described third step, then described portable terminal began place's emission uplink synchronous signature at described current descending pilot frequency time slot before portable terminal current descending pilot frequency time slot regularly.
4. ascending pilot frequency transmitting method according to claim 3 is characterized in that, the moment the earliest of described portable terminal emission uplink synchronous signature is the zero hour of described portable terminal downlink synchronous pilot frequency regularly.
5. ascending pilot frequency transmitting method according to claim 1 is characterized in that, in described first step, when needs carry out the antenna timing, the marker antenna trimming process is from the moment that the uplink synchronous time slot of real subframe begins, and wherein, described real subframe is the subframe of transmitting downstream pilot tone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101378037A CN101174869B (en) | 2006-11-01 | 2006-11-01 | Ascending pilot frequency transmitting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101378037A CN101174869B (en) | 2006-11-01 | 2006-11-01 | Ascending pilot frequency transmitting method |
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| Publication Number | Publication Date |
|---|---|
| CN101174869A CN101174869A (en) | 2008-05-07 |
| CN101174869B true CN101174869B (en) | 2011-06-22 |
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| CN2006101378037A Expired - Fee Related CN101174869B (en) | 2006-11-01 | 2006-11-01 | Ascending pilot frequency transmitting method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8886205B2 (en) * | 2009-03-02 | 2014-11-11 | Qualcomm Incorporated | Timing adjustment for synchronous operation in a wireless network |
| CN102215599B (en) | 2010-04-05 | 2015-03-18 | 中兴通讯股份有限公司 | Method for determining downlink time reference |
| CN102695285B (en) * | 2011-03-21 | 2014-12-03 | 华为技术有限公司 | Random access method under multi-carrier scenarios, and device |
| CN103037496B (en) * | 2011-09-29 | 2016-09-28 | 华为技术有限公司 | The transmission time of upward signal determines method and apparatus |
| CN103582151A (en) * | 2012-07-23 | 2014-02-12 | 中兴通讯股份有限公司 | Random access method and receiver |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1551654A (en) * | 2003-04-11 | 2004-12-01 | ��ʽ����Ntt����Ħ | Base station, mobile station, communication system, transmission control method, and mobile station control program |
| CN1744466A (en) * | 2005-10-18 | 2006-03-08 | 中兴通讯股份有限公司 | Method and device for increasing synchronous detection performance in synchronous CDMA system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1551654A (en) * | 2003-04-11 | 2004-12-01 | ��ʽ����Ntt����Ħ | Base station, mobile station, communication system, transmission control method, and mobile station control program |
| CN1744466A (en) * | 2005-10-18 | 2006-03-08 | 中兴通讯股份有限公司 | Method and device for increasing synchronous detection performance in synchronous CDMA system |
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