CN102118328B - Method for transmitting common channel signals in high-speed railway cell - Google Patents
Method for transmitting common channel signals in high-speed railway cell Download PDFInfo
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- CN102118328B CN102118328B CN201010124365.7A CN201010124365A CN102118328B CN 102118328 B CN102118328 B CN 102118328B CN 201010124365 A CN201010124365 A CN 201010124365A CN 102118328 B CN102118328 B CN 102118328B
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Abstract
The invention discloses a method for transmitting common channel signals in a high-speed railway cell, which comprises the following steps: setting TS0 (time slot 0) main transmission frequency points for covering a running railway train for all transmitting towers in the high-speed railway cell, wherein the TS0 main transmission frequency points of any two adjacent transmitting towers are mutually different; when a high-speed railway repeater positioned on the railway train is positioned in a common coverage range of any two transmitting towers, enabling the high-speed railway repeater to receive the common channel signals which are sent by any two transmitting tower through the respective TS0 main transmitting frequency points, estimating the frequency offset on the corresponding TS0 main transmitting frequency points according to the common channel signals which are sent by the two transmitting towers respectively, and estimating the common channel signals; and sending the estimated common channel signals onto UE (user equipment) on the railway train through a main carrier of the high-speed railway cell. By applying the method, the receiving performance of the common channel signals can be improved.
Description
Technical field
The present invention relates to the signal transmission technology in communication system, particularly a kind of transmission method of public channel signal in high-speed rail cell.
Background technology
In high-speed rail cell, UE can relative working frequency points produce a frequency deviation in the time of high-speed mobile, in current network processes, UE is after dedicated link is set up, utilize compensate of frequency deviation algorithm to estimate the frequency deviation with respect to working frequency points, the UE frequency deviation that dedicated link produces in high-speed rail cell is compensated, has solved the performance issue of dedicated service in high-speed rail cell.
But find in actual applications, when UE moves in high ferro, as when idle or the Cell-FACH/Cell_PCH/Ura_PCH state, the receptivity of common signal channel PCCPCH/SCCPCH is had to problem, particular problem is described below:
In high-speed rail cell as shown in Figure 1, the main carrier of supposing community, UE place is f
1, each launching tower in community is at frequency f
1on TS0 send common channel signal to UE, in the time that UE moves from launching tower 1 to launching tower 2, UE is at the zone line of launching tower 1 and launching tower 2, as shown in shadow region in Fig. 1, UE can receive the frequency offset signal of produce-Δ of launching tower 1 f, can receive the frequency offset signal of the one+Δ f that tower 2 produces simultaneously, can cause like this stack of reception ± Δ f frequency offset signal at UE place, in the time that the signal strength signal intensity of ± Δ f frequency offset signal approaches, for example, two signals differ 6dB, declining is soon appearred in the signal amplitude that causes UE to receive, cannot correctly demodulate signal, then cannot read system message causing cannot persistent district.Show according to test result, in the time that high ferro operation speed per hour reaches 430km/ hour, UE can reach 30%-40% in the amplitude of fading of shadow region.
Summary of the invention
In view of this, the invention provides a kind of transmission method of public channel signal in high-speed rail cell, while making UE in high-speed rail cell under idle or Cell-FACH/Cell_PCH/Ura_PCH state, can improve the receptivity of common channel signal.
For achieving the above object, the present invention adopts following technical scheme:
A transmission method for public channel signal in high-speed rail cell, comprising:
For each launching tower of described high-speed rail cell is provided for the main transmitting frequency of the TS0 that covers operating railroad train, and the main transmitting frequency of the TS0 of any two adjacent transmission towers is different, and each launching tower arranges a main transmitting frequency of TS0;
While being positioned at territory, common footprint in any two adjacent transmission towers, high ferro repeater on operating railroad train, described high ferro repeater receives after the common channel signal of described any two launching towers by the main transmitting frequency transmission of TS0 separately, the common channel signal sending respectively according to two launching towers is estimated the frequency deviation on the main transmitting frequency of corresponding TS0, and estimates described common channel signal;
To estimate that the common channel signal obtaining sends to the UE on described railroad train by the main carrier of described high-speed rail cell.
Preferably, the main transmitting frequency that for each launching tower of described high-speed rail cell TS0 is set is:
In the main carrier of described high-speed rail cell and auxiliary carrier wave, select frequency, be set to the main transmitting frequency of launching tower TS0.
Preferably, described high ferro repeater estimates that described common channel signal is:
Estimate the common channel signal that described any two launching towers send on the main transmitting frequency of TS0 separately, and according to the frequency deviation on the main transmitting frequency of these two TS0, the common channel signal carrying on two main transmitting frequencies of TS0 is carried out respectively to compensate of frequency deviation; By in two paths of signals after compensate of frequency deviation compared with Qiang mono-road common channel signal, as the estimated result of described common channel signal;
Or, estimate the common channel signal that described any two launching towers send on the main transmitting frequency of TS0 separately, and according to the frequency deviation on the main transmitting frequency of these two TS0, the common channel signal carrying on two main transmitting frequencies of TS0 carried out respectively to compensate of frequency deviation; Two paths of signals after compensate of frequency deviation is merged to the estimated result using amalgamation result as described common channel signal.
Preferably, described high ferro repeater estimates that described common channel signal is:
Estimate the common channel signal that described any two adjacent transmission towers send on the main transmitting frequency of TS0 separately, by two paths of signals compared with Qiang mono-road common channel signal, as the estimated result of described common channel signal.
Preferably, described compensate of frequency deviation carries out or carries out in radio frequency part in baseband portion.
Preferably, in the time need to carrying out the covering of user in user outside high ferro or the high ferro high ferro while stopping, the method further comprises: be not the first kind launching tower of described high-speed rail cell main carrier for the main transmitting frequency of TS0, on this first kind launching tower, further on the main carrier of described high-speed rail cell, send described common channel signal, user in high ferro while parking for covering the outer user of high ferro or high ferro, its transmitting power is less than the common channel signal transmitting power that sends separately the Equations of The Second Kind launching tower of common channel signal with described high-speed rail cell main carrier, make to judge unaffected for the signal strength signal intensity of the main transmitting frequency of TS0 on first kind launching tower and Equations of The Second Kind launching tower on described high ferro repeater.
As seen from the above technical solution, in the present invention, for each launching tower of high-speed rail cell arranges the transmitting dominant frequency point of TS0, and the TS0 of any two adjacent transmission towers transmitting dominant frequency point is different; In the time of the signal transmission of carrying out common signal channel, if be positioned at the territory, common footprint in any two adjacent transmission towers, high ferro repeater on railroad train, this high ferro repeater receives after the common channel signal of these two launching towers transmission on the transmitting of TS0 separately dominant frequency point, estimate the frequency deviation on this TS0 transmitting dominant frequency point according to the upper common channel signal sending of each TS0 transmitting dominant frequency point, and estimate the common channel signal sending; To estimate that the common channel signal obtaining sends to the UE on railroad train by the main carrier of high-speed rail cell.Launch main frequency point setting by the TS0 on each launching tower, make high ferro repeater in the time of the territory, common footprint of two adjacent transmission towers, reception is carried on the common channel signal on different carrier, therefore, can not produce the mutual stack of frequency deviation, thereby make high ferro repeater can correctly estimate the frequency deviation of different carrier, and carry out the estimation of common channel signal; Further, high ferro repeater will estimate that the common signal obtaining sends to UE by the main carrier of high-speed rail cell, because the common channel signal transmission between high ferro repeater and UE does not relate to the frequency deviation stack in different paths, thereby can improve the receptivity of UE to common channel signal.
Accompanying drawing explanation
Fig. 1 is high-speed rail cell schematic diagram.
Fig. 2 is the schematic diagram of common channel signal transmission method flow process in the embodiment of the present invention.
Fig. 3 is the configuration schematic diagram of carrying out according to the present invention in high-speed rail cell.
Embodiment
For making object of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing, the present invention is described in further details.
Basic thought of the present invention is: utilize frequency diversity mode to transmit the common channel signal of adjacent transmission tower, thereby avoid frequency deviation stack, improve the receptivity of common channel signal.
In multicarrier system, usually, be time slot at the TS0 of main carrier, on this TS0, send common channel signal; And for other auxiliary carrier waves in the system of at present application, the TS0 time slot free time, do not transmit any data.In the present invention, just utilize the TS0 time slot on auxiliary carrier wave to carry out the transmission of common channel signal, thereby make adjacent launching tower in the time that operating railroad train is covered, utilize different carrier to carry out common channel signal transmission, to avoid the frequency deviation stack of common channel signal of same carrier wave.Next, by specific embodiment, specific implementation of the present invention is described.
Fig. 2 is the schematic diagram of common channel signal transmission method flow process in the embodiment of the present invention.In this flow process, describe with the example that is transmitted as to PCCPCH channel signal.As shown in Figure 2, the method comprises:
Existing high ferro repeater is placed on High Speed Railway Trains, for receiving the signal of launching tower, after amplifying, is transmitted to UE again.High ferro repeater also need to be set in the present invention on High Speed Railway Trains, and this high ferro repeater increases Base-Band Processing function, can carry out demodulation, frequency deviation estimation and compensate of frequency deviation to the signal receiving.The realization of corresponding function is existing mode, is just integrated on high ferro repeater.
Launching tower in high-speed rail cell is mainly to cover service for the user on railroad train provides signal.Will mention below, in the present invention, the covering of the outer user of railroad train in community will be further considered, signal for user in high ferro and the outer user of high ferro covers, may on processing, can there are some differences, therefore, for distinguishing for covering the signal of railroad train in service and for covering the outer user's of railroad train signal, introducing the concept of the main transmitting frequency of the TS0 of launching tower in high-speed rail cell in the present invention.The main transmitting frequency of this TS0, it is the TS0 transmitting frequency for covering operating railroad train, it is for signal coverage mode, the signalling formula etc. of railroad train, and signal coverage mode, signalling formula etc. with the cell main carrier of mentioning in background technology on TS0 are identical.
In this step, the main transmitting frequency of the TS0 of each launching tower in high-speed rail cell is configured.In the scheme of describing in background technology, each launching tower of same high-speed rail cell, all sends common channel signal by the TS0 in cell main carrier.In the present invention, for avoiding in territory, adjacent transmission tower common footprint, there is the phenomenon of frequency deviation stack in the common channel signal sending on same carrier wave in the railroad train of operation, therefore, for adjacent transmission tower configures the main transmitting frequency of different TS0, thereby make adjacent transmission tower railroad train to operation on different carrier send common channel signal.
Here, in current system, the TS0 time slot of auxiliary carrier wave is idle, therefore, directly the auxiliary carrier wave of community is set to the main transmitting frequency of TS0 of part launching tower, other launching towers still adopt the main carrier of community as the main transmitting frequency of TS0, thereby realized easily, adjacent transmission tower are arranged to the main transmitting frequency of different TS0, can make full use of again system slack resources simultaneously.And the main transmitting frequency of TS0 of each launching tower only has 1.
For example, in the high-speed rail cell shown in Fig. 3, main the TS0 of launching tower 1 and launching tower 3 transmitting frequency is configured to the main carrier f of community
1, by the auxiliary carrier wave f in the main transmitting frequency of TS0 allocating cell of launching tower 2 and launching tower 4
2, launching tower 1 and launching tower 3 are by the main carrier f of community
1send PCCPCH signal, launching tower 2 and launching tower 4 are by the auxiliary carrier wave f of community
2send PCCPCH signal.
Here the region that the appearance UE receptivity of mentioning in the territory, common footprint of said two adjacent transmission towers and background technology sharply declines is incomplete same, and territory, common footprint refers to: high ferro repeater can receive the region of the signal of these two adjacent transmission towers transmissions simultaneously.Shadow region in background technology refers to, the region that the signal strength signal intensity that two adjacent transmission towers that UE receives send relatively approaches, and for example, two signals differ 6dB with interior region.
In the time that high ferro repeater is positioned at the territory, common footprint of two adjacent transmission towers, can receive the common channel signal sending from two launching towers.Further, because signal reception can be carried out in high ferro repeater on multiple frequencies simultaneously, therefore, for the common channel signal that comes from two launching towers in the present invention and send by different frequent points, high ferro repeater also can receive respectively.And each frequency only has the frequency deviation of a Δ f, the stack of do not have ± Δ f signal, correct demodulation can be carried out to two frequency signals respectively in high ferro repeater.
In territory, whole common footprint, the signal that high ferro repeater utilizes the mode of this step and subsequent step to send two adjacent transmission towers is processed.
For example, shown in Fig. 3, high ferro repeater is positioned at the territory, common footprint of tower 2 and tower 3, receives by carrier wave f
1with carrier wave f
2the PCCPCH signal sending.
By the setting of step 202, the main transmitting frequency of TS0 of adjacent transmission tower is different, the PCCPCH signaling bearer that adjacent two launching towers that high ferro repeater receives send is on two different carrier waves, the frequency deviation of two PCCPCH signals that therefore, high ferro repeater receives just can not be superimposed.Specific to the scene shown in Fig. 3, i.e. main carrier f
1on PCCPCH signal there is frequency deviation Δ f
1, main carrier f
2on PCCPCH signal there is frequency deviation Δ f
2, due to two carrier wave differences, therefore frequency deviation Δ f
1with Δ f
2can not superpose, even in the region relatively approaching two PCCPCH signal amplitudes (being that the region of declining soon appears in the UE reception signal of describing in background technology), two PCCPCH signals also can not be superimposed, and have therefore overcome the problem of the UE receptivity decline occurring in background technology.
In this step, according to the PCCPCH signal sending on the main transmitting frequency of each TS0, estimate the frequency deviation on the main transmitting frequency of each TS0.Specific to the scene shown in Fig. 3, estimate main carrier f
1frequency deviation Δ f
1with auxiliary carrier wave f
2frequency deviation Δ f
2.The concrete mode of estimating frequency deviation can adopt any existing mode.
The specific implementation of this step can have two kinds:
PCCPCH signal on the main transmitting frequency of two TS0 receiving in mode one, estimating step 203, and according to the frequency offset estimation result of step 203, the PCCPCH signal on estimate two main transmitting frequencies is carried out respectively to compensate of frequency deviation; Again by the two paths of signals after compensate of frequency deviation compared with Qiang mono-road PCCPCH signal, as the estimated result of PCCPCH signal;
For example, in the scene shown in Fig. 3, carrier wave f is estimated in high ferro repeater
1and f
2on PCCPCH signal, and utilize respectively frequency deviation Δ f
1with Δ f
2carry out compensate of frequency deviation; In signal after compensate of frequency deviation, select the mono-road PCCPCH signal compared with Qiang, Jiang Gai road PCCPCH signal, as the PCCPCH signal of estimating to obtain, sends to UE in next step again.
PCCPCH signal on two carrier waves that receive in mode two, estimating step 203, and according to the frequency offset estimation result of step 203, the PCCPCH signal on estimate two carrier waves is carried out respectively to compensate of frequency deviation; PCCPCH signal on two carrier waves after compensate of frequency deviation is merged, and the signal after merging is as the estimated result of PCCPCH signal; This mode, can bring certain merging diversity gain;
For example, in the scene shown in Fig. 3, carrier wave f is estimated in high ferro repeater
1and f
2on PCCPCH signal, and utilize respectively frequency deviation Δ f
1with Δ f
2carry out compensate of frequency deviation; Again the signal after compensate of frequency deviation is merged, as the PCCPCH signal of estimating to obtain, in next step, send to UE.
In above-mentioned processing procedure, the operation of compensate of frequency deviation can be carried out in Base-Band Processing part, also can carry out by the Radio frequency Processing Unit, RF Processing Unit in the time sending to UE.
In this step, high ferro repeater still sends to UE by a carrier wave by PCCPCH signal.Owing to there is not the stack of different frequency deviations between high ferro repeater and UE, therefore, UE can receive PCCPCH signal better.
When specific implementation, can in high ferro repeater, preserve frequency inverted relation, example scene as shown in Figure 3, preserves f
2-->f
1frequency inverted relation, thereby make the common channel signal receiving on auxiliary carrier wave, be still transferred to UE by main carrier.
So far, the common channel signal transmission method flow process in the present invention finishes.By above-mentioned flow process, the main transmitting frequency of TS0 for each launching tower of network side adopts different allocation strategies, thereby avoid adjacent transmission tower to send to the common channel signal of railroad train in service to send on same carrier wave and produce frequency deviation stack, improving the receptivity of UE to common channel signal; And without any variation, UE still receives common channel signal from community dominant frequency point, can't see auxiliary frequency for the processing of UE; Only network side is improved, and this improvement is relatively simple, easily realizes, resource has also only been utilized the TS0 of auxiliary carrier wave.
In addition, in step 204, for example, when frequency deviation less (the high ferro speed of service is slower), also can not carry out compensate of frequency deviation in high ferro repeater, but in the two paths of signals demodulating, select compared with Qiang mono-tunnel, as common channel signal estimated result, then to send to UE by cell main carrier in step 205.In this case, the signal that UE receives remains and has frequency deviation, and the frequency deviation that receives signal there will be saltus step, can affect to a certain extent the signal receiving performance of UE.
Meanwhile, for the railway line of long distance, may exist multiple high-speed rail cells to cover the different sections of highway of same railway line, in this case, in high speed rail train operation process, can relate to the problem that switch community.Under Typical Disposition, alien frequencies configuration is carried out in neighbor cell.In this case, in the time carrying out community switching, it between cell-of-origin and Target cell, itself is exactly alien frequencies (main carrier of Ji Liangge community is different), therefore, territory, common footprint on these two cell boarders, there will not be the mutual stack of frequency deviation, namely Liang Ge community common channel signal is separately processed in high ferro repeater on cell boarder, on cell boarder for the launching tower of cell-of-origin and Target cell, do not need specially to arrange according to mode of the present invention the main transmitting frequency of its TS0 yet, but only need to guarantee in each community, the main transmitting frequency of adjacent transmission tower TS0 is different.In addition, due to the common channel signal of independent process Liang Ge community on cell boarder, high ferro repeater,, can there is not merging diversity gain in first launching tower after switch community therefore.
But also do not get rid of some in particular cases, carry out with configuration frequently neighbor cell.In this case, carrying out community while switching, between cell-of-origin and Target cell, be that the territory, common footprint on these two cell boarders, also there will be the mutual stack of frequency deviation so with (main carrier of Ji Liangge community is identical) frequently.For also guaranteeing that at cell boarder place UE's is normally resident, in the time the main transmitting frequency of TS0 being set for the launching tower of high-speed rail cell, in two adjacent co-frequency cells, except in inside, community separately, the main transmitting frequency point setting of TS0 of adjacent transmission tower as hereinbefore outside, further also be set to different at the main transmitting frequency of TS0 of the adjacent transmission tower at two cell boarder places, and, Liang Ge community common channel signal is separately processed independently of each other in high ferro repeater on this border, two neighbor cells, and select to send to UE compared with Qiang mono-road signal by the main carrier of respective cell, and do not merge processing, meanwhile,, can there is not merging diversity gain in first launching tower after switch community.
Further, in high-speed rail cell, also may there is the user on non-high ferro train, for solving in high-speed rail cell the resident of user on non-high ferro train, or resident problem after high ferro Train Stopping, on the basis of the invention described above flow process, the present invention further provides following processing:
First, the source of problem is once described, the launching tower of high-speed rail cell is divided into two classes, the first kind is the main transmitting frequency of the TS0 launching tower different from cell main carrier in aforementioned flow process, the launching tower that adopts auxiliary carrier wave to carry out the transmission of TS0 signal, for example tower 2 in Fig. 3 and tower 4; Equations of The Second Kind is the main transmitting frequency of the TS0 launching tower identical with cell main carrier in aforementioned flow process, the launching tower that adopts main carrier to carry out the transmission of TS0 signal, for example tower 1 in Fig. 3 and tower 3.In the time being positioned at apart from the nearer position of Equations of The Second Kind launching tower after the user on non-high ferro train or high ferro Train Stopping, for example, in tower 2 or tower 4 times, due to auxiliary carrier wave f
2on do not configure DwPTS, the outer UE of high ferro or high ferro stop after the UE f that can not detect
2the PCCPCH signal of carrier wave, therefore cannot reside in community.
For addressing this problem, concrete processing is as follows: can on first kind launching tower, also send common channel signal by the main carrier by high-speed rail cell, but the common channel signal intensity sending by main carrier is little more a lot of than the common channel signal intensity sending on adjacent Equations of The Second Kind launching tower, thereby guarantee that the high ferro repeater on operating high ferro train judges unaffected to the signal strength signal intensity of main carrier and auxiliary carrier wave, simultaneously, because first kind launching tower also sends common channel signal on main carrier, therefore, after user on non-high ferro train or high ferro Train Stopping, be positioned at when nearer apart from first kind launching tower, still can receive common channel signal, reside in community.For example, in the scene shown in Fig. 3, can on tower 2, pass through carrier wave f
1also send common channel signal, but the intensity of this common channel signal is much smaller than the intensity of common channel signal on tower 1 and tower 3, the covering radius of for example this common channel signal is only 1/5 of tower 1 and tower spacing, like this, on near non-high ferro train tower 2, user can realize in community resident on the one hand, high ferro repeater on operating high ferro train on the other hand, still can be to correctly judging with the common channel signal intensity of two frequencies.
In addition, in above-mentioned common channel signal transmission method, being transmitted as example with the signal of PCCPCH channel is illustrated, in fact, the common channel signal transmitting on main carrier for other, for example, also can support the upper MBMS business sending from SCCPCH of TS0, its processing mode is identical, can improve equally the receptivity of UE to this signal, just repeats no more here.
These are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a transmission method for public channel signal in high-speed rail cell, is characterized in that, the method comprises:
For each launching tower of same high-speed rail cell is provided for the main transmitting frequency of the TS0 that covers operating railroad train, and the main transmitting frequency of the TS0 of any two the adjacent transmission towers in described high-speed rail cell is different, each launching tower arranges a main transmitting frequency of TS0;
While being positioned at territory, common footprint in any two adjacent transmission towers, high ferro repeater on operating railroad train, described high ferro repeater receives after the common channel signal of described any two launching towers by the main transmitting frequency transmission of TS0 separately, the common channel signal sending respectively according to two launching towers is estimated the frequency deviation on the main transmitting frequency of corresponding TS0, and estimates described common channel signal;
To estimate that the common channel signal obtaining sends to the UE on described railroad train by the main carrier of described high-speed rail cell;
Wherein, in the time need to carrying out the covering of user in user outside high ferro or the high ferro high ferro while stopping, the method further comprises: be not the first kind launching tower of described high-speed rail cell main carrier for the main transmitting frequency of TS0, on this first kind launching tower, further on the main carrier of described high-speed rail cell, send described common channel signal, user in high ferro while parking for covering the outer user of high ferro or high ferro, its transmitting power is less than the common channel signal transmitting power that sends separately the Equations of The Second Kind launching tower of common channel signal with described high-speed rail cell main carrier, make to judge unaffected for the signal strength signal intensity of the main transmitting frequency of TS0 on first kind launching tower and Equations of The Second Kind launching tower on described high ferro repeater.
2. method according to claim 1, is characterized in that, the main transmitting frequency that TS0 is set for each launching tower of described high-speed rail cell is:
In the main carrier of described high-speed rail cell and auxiliary carrier wave, select frequency, be set to the main transmitting frequency of launching tower TS0.
3. method according to claim 1, is characterized in that, described high ferro repeater estimates that described common channel signal is:
Estimate the common channel signal that described any two launching towers send on the main transmitting frequency of TS0 separately, and according to the frequency deviation on the main transmitting frequency of these two TS0, the common channel signal carrying on two main transmitting frequencies of TS0 is carried out respectively to compensate of frequency deviation; By in two paths of signals after compensate of frequency deviation compared with Qiang mono-road common channel signal, as the estimated result of described common channel signal;
Or, estimate the common channel signal that described any two launching towers send on the main transmitting frequency of TS0 separately, and according to the frequency deviation on the main transmitting frequency of these two TS0, the common channel signal carrying on two main transmitting frequencies of TS0 carried out respectively to compensate of frequency deviation; Two paths of signals after compensate of frequency deviation is merged to the estimated result using amalgamation result as described common channel signal.
4. method according to claim 1, is characterized in that, described high ferro repeater estimates that described common channel signal is:
Estimate the common channel signal that described any two adjacent transmission towers send on the main transmitting frequency of TS0 separately, by two paths of signals compared with Qiang mono-road common channel signal, as the estimated result of described common channel signal.
5. method according to claim 3, is characterized in that, described compensate of frequency deviation carries out or carries out in radio frequency part in baseband portion.
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