CN103369631A - Mobile communication terminal frequency point sequencing method and apparatus - Google Patents
Mobile communication terminal frequency point sequencing method and apparatus Download PDFInfo
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- CN103369631A CN103369631A CN2012100934125A CN201210093412A CN103369631A CN 103369631 A CN103369631 A CN 103369631A CN 2012100934125 A CN2012100934125 A CN 2012100934125A CN 201210093412 A CN201210093412 A CN 201210093412A CN 103369631 A CN103369631 A CN 103369631A
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Abstract
The invention relates to a mobile communication terminal frequency point sequencing method and apparatus, for identifying a main carrier frequency. The frequency point sequencing method comprises the following steps: receiving at least half a piece of radio frame data of each frequency point within a work frequency band; calculating the power of each frequency point according to the data of each frequency point; detecting the position of a downlink pilot time slot of the data of each frequency point and measuring the power of the downlink pilot time slot; and performing combined sequencing on each frequency point according to the power of each frequency point and the power of the downlink pilot time slot, wherein the sequencing based on the power of the downlink pilot time slot is higher than the sequencing based on the frequency points in terms of priority.
Description
Technical field
The present invention mainly relates to the TD-SCDMA mobile communication terminal, especially relates to the frequency ordering of measuring between the Cell searching of TD-SCDMA terminal or system.
Background technology
TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) is by the technical standard of the leading third generation radio communication of China, enters commercial stage at present.The TD-SCDMA terminal is carried out starting stage or the isosystem measurement stage of Cell searching in start, need to measure and sort the power of each frequency, the subsequent process that begins to carry out Cell searching or detection from the strongest frequency of power.
The frame structure of TD-SCDMA system as shown in Figure 1.The code channel 1 of time slot TS0,2 carrying PCCPCH (Primary Common Control Physical Channel, Primary Common Control Physical Channel), DwPTS (descending pilot frequency time slot) carries SYNC_DL (descending synchronous code).Time slot TS1 is business time-slot to time slot TS6, the bearer service data.
Wireless frame length of TD-SCDMA is 10ms, is divided into two 5ms subframes.The structure of these two subframes is identical.As shown in Figure 2, each subframe is divided into again 7 conventional time slots and 3 special time slots that length is 675us.These three special time slots are respectively DwPTS (descending pilot frequency time slot), GP (protection time slot) and UpPTS (uplink pilot time slot).In 7 conventional time slots, TS0 always distributes to down link, and TS1 always distributes to up link.
After supporting N carrier frequency characteristic, the TD-SCDMA residential quarter only must transmitted signal on the TS0 of main carrier frequency and DwPTS.On working carrier frequency, may only have to have the uplink and downlink signal on the business time-slot.
In Cell searching, the method for the power measurement of frequency is: the receiver frequency is set, receives a complete sub-frame data and carry out power measurement; The 6400chips data of a subframe are cut into 25 pieces, and every 256chips calculates the RSSI (Received Signal Strength Indication, received signal strength indicator) of each blocks of data; Choose the RSSI maximum (being designated as max_RSSI) of these pieces as the power of this frequency.According to the max_RSSI watt level of each frequency, ordering determines follow-up synchronous search-order.The precondition of this method is the signal power that RSSI power can embody main carrier frequency.Yet under the environment that is disturbed, this precondition often can not be met.
For instance, if the near zone of terminal, other user sets up network connection in working carrier frequency, and this moment is by measured this working carrier frequency of existing rssi measurement method and the RSSI power on the frequency is very strong on every side.The signal of working carrier frequency disturbs in the RSSI power ordering that causes the Cell searching stage, and the working carrier frequency ordering is forward, after the main carrier frequency ordering is leaned on, even causes the selected not follow-up synchronous search frequency tabulation of main carrier frequency.
In other situation, when existing stronger non-TD signal to disturb in the frequency band, when existing RSSI power measurement method also may cause the ordering of RSSI power, after the main carrier frequency ordering is leaned on, even cause the not selected follow-up synchronous search listing of main carrier frequency.
The problems referred to above exist in the TD-LTE system equally.
Summary of the invention
Technical problem to be solved by this invention provides a kind of frequency point sequencing method and device of mobile communication terminal, to realize the identification of main carrier frequency.
The present invention solves the problems of the technologies described above the frequency point sequencing method that proposes a kind of mobile communication terminal, may further comprise the steps: receive each frequency at least half wireless frame data in the working band; Calculate the power of described each frequency according to the data of described each frequency; Descending pilot frequency time slot position in the data of described each frequency of detection, and the power of measurement descending pilot frequency time slot; According to the power of described each frequency and the power of descending pilot frequency time slot each frequency is united ordering, wherein be higher than Sort Priority based on the power of frequency based on the Sort Priority of the power of descending pilot frequency time slot.
In one embodiment of this invention, above-mentioned power and the power of descending pilot frequency time slot step that each frequency is united ordering according to described each frequency comprises: filter out frequency point sets that the position probing result of descending pilot frequency time slot in the data of described each frequency is higher than a predetermined threshold as the high priority frequency point sets, and according to the power ordering of descending pilot frequency time slot; And the frequency that will not be selected in described high priority frequency point sets is as the low priority frequency point sets, according to the power ordering of frequency.
In one embodiment of this invention, to not be selected in the frequency of described high priority frequency point sets as the low priority frequency point sets, in the step that sorts according to the power of frequency, each working band to described terminal carries out respectively the ordering first time, the low priority frequency of amount of exports determined number, again according to the power of frequency, the low priority frequency of each frequency band of hybrid-sorting.
In one embodiment of this invention, descending pilot frequency time slot position in the data of described each frequency of detection, and the step of measuring the power of descending pilot frequency time slot also comprises, the power assignment of descending pilot frequency time slot that the position probing result of descending pilot frequency time slot is lower than the frequency of this predetermined threshold is zero.
In one embodiment of this invention, the method for the descending pilot frequency time slot position in the data of described each frequency of detection is: utilize the power window characteristics of descending pilot frequency time slot, estimate the descending pilot frequency time slot position.
In one embodiment of this invention, the method for the descending pilot frequency time slot position in the data of described each frequency of detection is: utilize the correlation of descending synchronous code, estimate the descending pilot frequency time slot position.
In one embodiment of this invention, the step of the power of the descending pilot frequency time slot of described each frequency of measurement comprises, after confirming the position of descending synchronous code by the position probing of descending pilot frequency time slot, calculates the power of descending synchronous code.
In one embodiment of this invention, characterize the power of described each frequency and the power of descending pilot frequency time slot with received signal strength indicator.
In one embodiment of this invention, described mobile communication terminal is TD-SCDMA terminal or TD-LTE terminal.
The present invention also proposes a kind of frequency collator of mobile communication terminal, comprising: the module that is used for receiving each frequency at least half wireless frame data in the working band; Be used for calculating according to described data the module of the power of described each frequency; For detection of the descending pilot frequency time slot position in the data of described each frequency, and measure the module of power of the descending pilot frequency time slot of described each frequency; Be used for according to the power of the power of described each frequency and descending pilot frequency time slot each frequency being united the module of ordering, wherein be higher than Sort Priority based on the power of frequency based on the Sort Priority of the power of descending pilot frequency time slot.
The present invention is owing to adopting above technical scheme, make it compared with prior art, by additional DwPTS position probing and DwPTS power measurement, for frame TD data, return simultaneously these two of frequency power and DwPTS power and measure item, and by uniting ordering, realized filtering out at the frequency phase sorting purpose of the stronger main carrier frequency of signal.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the TD-SCDMA multi-frame structure.
Fig. 2 illustrates the TD-SCDMA subframe structure.
Fig. 3 illustrates the frequency point sequencing method flow process of one embodiment of the invention.
Fig. 4 illustrates the program circuit of the frequency point sequencing method of one embodiment of the invention.
Embodiment
Embodiments of the invention will describe mobile communication terminal in the situation that unknown TD regularly, carries out the method for power ordering to the signal strength signal intensity of TD frequency (or frequency range).These unknown TD situation regularly comprises usually that start carries out Cell searching just searches measuring phases between stage or system.The method of the embodiment of the invention can be used for TD-SCDMA system and follow-up TD-LTE system, and in these TD systems, the power difference of each time slot is very large on the main carrier frequency, processes to frequency sweep and has brought defective and difficulty.
Specifically, present frequency point sequencing method is that the receiver frequency is set in the TD system, receive a complete sub-frame data (the TD-SCDMA system is half radio frames) or 5 sub-frame datas (the TD-LTE system is half radio frames) carry out power measurement; The data of half radio frames are cut into a plurality of, calculate respectively the RSSI of each blocks of data; Choose RSSI (received signal strength indicator) maximum (being designated as max_RSSI) of these pieces as the power of this frequency.According to the max_RSSI watt level of each frequency, ordering determines follow-up synchronous search-order.But when the power difference of each time slot in the subframe was larger, existing RSSI power measurement is resulting to be the RSSI of the strongest time slot of subframe internal power (may be up sending time slots).That is, the RSSI power measurement does not embody the PCCPCH code channel of main carrier frequency or the power of DwPTS time slot.
In order to overcome the existing methods defective, according to embodiments of the invention, will carry out the identification of main carrier frequency at the frequency phase sorting, the preferential stronger main carrier frequency of RSSI of carrying out DwPTS (descending pilot frequency time slot) is searched for synchronously in follow-up flow process.
Fig. 3 illustrates the frequency point sequencing method flow process of one embodiment of the invention.This flow process can be carried out in the mobile communication terminal of TD-SCDMA or TD-LTE standard.With reference to shown in Figure 3, step 10 is the step of data receiver, and terminal can receive respectively the data of at least half radio frames on each frequency.With the TD-SCDMA system, when starting up of terminal or after losing synchronously, terminal is not also known the timing of TD-SCDMA network, so terminal can receive respectively the signal of a complete TD-SCDMA subframe (i.e. half radio frames) at each frequency, just can know the power of a frequency.Similarly, in measurement when control of receiving different system TD adjacent area, terminal is not also known the timing of TD-SCDMA network, so terminal also must receive the signal of a complete subframe, just can know the power of a TD frequency.In the LTE system, each radio frames comprises 10 subframes, and terminal need to receive at least half radio frames, and namely the data of 5 subframes just can be known the power of a TD frequency.
The step that step 20 is processed for data.Specifically, terminal is measured the power of each frequency and the descending pilot frequency time slot power of each frequency.In this example, characterize power with RSSI.The data of half radio frames are cut into several pieces, calculate the RSSI of each blocks of data, choose the RSSI maximum (being designated as max_RSSI) of these pieces as the power of this frequency.Therefore the power of each frequency is designated as max_RSSI, and the descending pilot frequency time slot power of each frequency is designated as DwPTS_RSSI.In the present embodiment, in order to measure the power of DwPTS, also need to detect in advance the position of DwPTS.
In one embodiment, the method for DwPTS position probing can be: utilize the power window characteristics of DwPTS, estimate the position of DwPTS.It is stronger that the power window of DwPTS (being Window) has middle 64chips (descending synchronous code SYNC_DL) power, the characteristics that each 32chips of both sides (GAP time slot) power is weak.This method is usually used in the thick of TD-SCDMA and detects synchronously.Usually, if satisfy:
Wherein, P1, P2 are the power of the power window continuous 32chips in two ends; P3 is the power of continuous 64chips in the middle of the power window.Threshold1 is predetermined threshold one.In the present embodiment, thresholding one can be set to 0.05.But be appreciated that thresholding one can change in different actual environments.
In another embodiment, the method for DwPTS position probing can be utilized the correlation of SYNC_DL.That is, slide window and calculate piecemeal the relevant of (6400+128) chips receive data and 32 SYNC_DL.If exist the peak-to-average force ratio value of certain SYNC_DL code correlated results more than or equal to predetermined threshold two, just can think the SYNC_DL code that has comprised the DwPTS time slot in these frame data.In one embodiment, thresholding two can be set to 32.But be appreciated that thresholding two can change in different actual environments.
Use the correlation of SYNC_DL to carry out the Performance Ratio that DwPTS detects more satisfactory, but because the operand that calculates the SYNC_DL correlation of sliding piecemeal is very large.Therefore, can combine above-mentioned two kinds of embodiment, namely save operand, improve again reliability.Specific embodiment is as follows:
Use DwPTS power window characteristics, for half wireless frame data that receives, detect
Be corresponding that one piece of data of minimum value.This one piece of data is 128chips, wherein comprises the higher 64chips data of middle power, and low each the 32chips data of both sides power.For this
The optimal 128chips data of ratio are calculated the correlation of each SYNC_DL code.If exist in the correlated results of some SYNC_DL ID, the peak-to-average force ratio value thinks then that more than or equal to thresholding two (for example 32) this frequency is the TD main carrier frequency, calculates and return DwPTS_RSSI.If the correlated results of each SYNC_DL ID is thresholding two only all, then returning this frequency is not the TD main carrier frequency, and it is 0 that DwPTS_RSSI is set.
In one embodiment, the method that DwPTS_RSSI measures is: after detecting the position of confirming SYNC_DL by DwPTS, calculate the RSSI of SYNC_DL, this DwPTS_RSSI has embodied the downstream signal intensity of main carrier frequency.
Step 30 is the step of frequency power ordering.The present embodiment has adopted the ordering of uniting of the maximum power of frequency and descending pilot frequency time slot power.At this, preferentially according to the size of descending pilot frequency time slot power (for example DwPTS_RSSI), to pick out descending pilot frequency time slot and detect the frequency that surpasses predetermined threshold, these frequencies may be main carrier frequency, therefore should first search.Cause the frequency that is not selected in because testing result surpasses predetermined threshold, according to sort the respectively maximum power (for example max_RSSI) of frequency of TD frequency range, pick out the carrier frequency that may have signal again.
Step 40 is search step.At this, according to the priority of step 30 ordering, preferentially attempt the stronger cell timing of searching downlink pilot frequency slot power.
Fig. 4 illustrates the program circuit of the frequency point sequencing method of one embodiment of the invention.This flow process is to carry out in the mobile communication terminal of TD-SCDMA or TD-LTE standard.With reference to shown in Figure 4, flow process is as follows:
At first in step 401, terminal receives at least half wireless frame data of a frequency in the working band.In an embodiment of the present invention, the working band of terminal can comprise a frequency band or a plurality of discontinuous frequency band.For example, working band can comprise one or more in 2010～2025MHz frequency band, 1880～1900MHz frequency band, 1900～1920MHz frequency band, the 2300～2400MHz frequency band.
Usually, when terminal and do not know the timing of TD-SCDMA network, need to receive at a frequency data of a complete TD-SCDMA subframe, just can know the power of a frequency.In preferred embodiment, terminal can receive the data of (6400+128) chips.The extra data that receive 128chips, this is to consider that Window may partly appear at the situation of the ending that the beginning of receive data, another part appear at receive data.The extra data that receive 128chips help to guarantee to have comprised in the receive data complete DwPTS.But be understandable that, receive only a subframe, namely 6400chips remains feasible, when the beginning another part that just partly appears at receive data at Window appears at the ending of receive data, need to piece together out complete Window.
In step 402, calculate power in each frequency according to above-mentioned data.In this example, characterize power with RSSI.Specifically, the data of half radio frames are cut into several pieces, calculate the power (for example RSSI) of each blocks of data, choose the power maximum (for example maximum max_RSSI of RSSI) of these pieces, with its power as this frequency.
In step 403, detect the descending pilot frequency time slot position in the receive data of each frequency, and measure the power of the descending pilot frequency time slot of each frequency.The illustrative methods of DwPTS position probing and DwPTS power measurement is described at preamble, does not repeat them here.At this, the descending pilot frequency time slot power of each frequency is designated as DwPTS_RSSI, and this DwPTS_RSSI has embodied the downstream signal intensity of main carrier frequency.
In step 404, judge whether the DwPTS position probing is desirable.At this, if greater than a default thresholding, then thinking, DwPTS position probing result has the DwPTS time slot in the receive data.Otherwise, can think not have the DwPTS time slot in the receive data, can be made as 0 with the DwPTS of frequency this moment in step 405, as the mark that does not have the DwPTS time slot.
In step 406, judge whether to travel through all frequencies, if for being then enter step 407, otherwise return step 401, until travel through all frequencies.
Carry out the ordering of uniting of frequency power and descending pilot frequency time slot power in step 407 and 408, at first in step 407, filter out the high priority frequency point sets, it is the individual frequency point sets of M (M is positive integer) that the position probing result of descending pilot frequency time slot is higher than a predetermined threshold in the data of each frequency.Then with the power of high priority frequency point sets according to descending pilot frequency time slot, sort from big to small.
Then in step 408, N frequency of selected described high priority frequency point sets not as the low priority frequency point sets, according to the power of frequency, sorted from big to small.
In follow-up search or synchronization detection process, will preferentially attempt the frequency of high priority, then just attempt the frequency of low priority.
In one embodiment, during execution in step 408, can carry out respectively at each working band of terminal first time ordering, the low priority frequency of amount of exports determined number, again according to the power of frequency, the low priority frequency of each frequency band of hybrid-sorting.
In one embodiment, according to the difference of frequency band, sort respectively and the exemplary method of selecting the low priority frequency is: for the frequency of selected high priority not in 2010～2025MHz frequency band, according to N1 frequency of max_RSSI ordering output; For the frequency that is not selected in high priority in 1880～1900MHz frequency band, according to N2 frequency of max_RSSI ordering output; For the frequency that is not selected in high priority in 1900～1920MHz frequency band, according to N3 frequency of max_RSSI ordering output; For the frequency that is not selected in high priority in 2300～2400MHz frequency band, according to N4 frequency of max_RSSI ordering output.
When doing the selecting of low priority frequency, do the former of above-mentioned frequency-division section ordering because: the annoyance level of the non-TD signal in each frequency band of TD is inconsistent, and what avoid being selected in is interference frequency in some frequency bands entirely.
In sum, the frequency point sequencing method that embodiments of the invention propose is compared with original method, by additional DwPTS position probing and DwPTS power measurement, for frame TD data, return simultaneously these two of frequency power and DwPTS power and measure item, and by uniting ordering, realized filtering out at the frequency phase sorting purpose of the stronger main carrier frequency of signal.
In the comparatively ideal situation of main carrier frequency signal, the method that embodiments of the invention propose can be got rid of the factor affecting such as interference of working frequency points, non-TD signal, effectively reduces synchronous search time of follow-up TD, promotes the performance of the stronger main carrier frequency of retention signal.Under the less-than-ideal weak letter environment of main carrier frequency (DwPTS) signal, the method for the embodiment of the invention and former methodical performance are basically identical, can not introduce new risk, can not cause the decline of performance.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (12)
1. the frequency point sequencing method of a mobile communication terminal may further comprise the steps:
A. data of at least half radio frames of each frequency in the working band of receiving terminal;
B. calculate the power of described each frequency according to the data of described each frequency;
C. detect the descending pilot frequency time slot position in the data of described each frequency, and measure the power of descending pilot frequency time slot;
D. according to the power of described each frequency and the power of descending pilot frequency time slot each frequency is united ordering, wherein be higher than Sort Priority based on the power of frequency based on the Sort Priority of the power of descending pilot frequency time slot.
2. the method for claim 1 is characterized in that, described steps d comprises:
D1. filter out frequency point sets that the position probing result of descending pilot frequency time slot in the data of described each frequency is higher than a predetermined threshold as the high priority frequency point sets, and sort according to the power of descending pilot frequency time slot; And
The frequency that d2. will not be selected in described high priority frequency point sets is as the low priority frequency point sets, sorts according to the power of frequency.
3. method as claimed in claim 2 is characterized in that, in the described steps d 2, each working band in described terminal carries out the ordering first time, the low priority frequency of the equal amount of exports determined number of each frequency band, again according to the power of frequency, the low priority frequency of each frequency band of hybrid-sorting.
4. method as claimed in claim 2 is characterized in that, described step c also comprises, the power assignment of descending pilot frequency time slot that the position probing result of descending pilot frequency time slot is lower than the frequency of this predetermined threshold is zero.
5. the method for claim 1 is characterized in that, the method for the descending pilot frequency time slot position in the data of described each frequency of detection is: utilize the power window characteristics of descending pilot frequency time slot, estimate the descending pilot frequency time slot position.
6. the method for claim 1 is characterized in that, the method for the descending pilot frequency time slot position in the data of described each frequency of detection is: utilize the correlation of descending synchronous code, estimate the descending pilot frequency time slot position.
7. the method for claim 1 is characterized in that, the step of the power of the descending pilot frequency time slot of described each frequency of measurement comprises, after confirming the position of descending synchronous code by the position probing of descending pilot frequency time slot, calculates the power of descending synchronous code.
8. the method for claim 1 is characterized in that, characterizes the power of described each frequency and the power of descending pilot frequency time slot with received signal strength indicator.
9. the method for claim 1 is characterized in that, described mobile communication terminal is the TD-SCDMA terminal.
10. the method for claim 1 is characterized in that, described mobile communication terminal is the TD-LTE terminal.
11. the frequency collator of a mobile communication terminal comprises:
Be used for receiving the module of each frequency at least half wireless frame data in the working band;
Be used for calculating according to described data the module of the power of described each frequency;
For detection of descending pilot frequency time slot position in the data of described each frequency, and measure the module of power of the descending pilot frequency time slot of described each frequency;
Be used for according to the power of the power of described each frequency and descending pilot frequency time slot each frequency being united the module of ordering, wherein be higher than Sort Priority based on the power of frequency based on the Sort Priority of the power of descending pilot frequency time slot.
12. device as claimed in claim 11 is characterized in that, described module for according to the power of the power of described each frequency and descending pilot frequency time slot each frequency being united ordering comprises:
Be used for filtering out frequency point sets that the position probing result of the data descending pilot frequency time slot of described each frequency is higher than a predetermined threshold as the high priority frequency point sets, and according to the module of the power ordering of the descending pilot frequency time slot of frequency; And
Each frequency that is used for not be selected in described high priority frequency point sets is as the low priority frequency point sets, the module that sorts according to the power of frequency.
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| CN107124243A (en) * | 2017-07-03 | 2017-09-01 | 深圳国人通信股份有限公司 | A kind of method and device for realizing that TDD LTE are synchronous |
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Application publication date: 20131023 |